git.oblomov.eu Git - linux-2.6/blob - drivers/usb/serial/io_edgeport.c

   1 /*
   2  * Edgeport USB Serial Converter driver
   3  *
   4  * Copyright (C) 2000 Inside Out Networks, All rights reserved.
   5  * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; either version 2 of the License, or
  10  *      (at your option) any later version.
  11  *
  12  * Supports the following devices:
  13  *      Edgeport/4
  14  *      Edgeport/4t
  15  *      Edgeport/2
  16  *      Edgeport/4i
  17  *      Edgeport/2i
  18  *      Edgeport/421
  19  *      Edgeport/21
  20  *      Rapidport/4
  21  *      Edgeport/8
  22  *      Edgeport/2D8
  23  *      Edgeport/4D8
  24  *      Edgeport/8i
  25  *
  26  * For questions or problems with this driver, contact Inside Out
  27  * Networks technical support, or Peter Berger <pberger@brimson.com>,
  28  * or Al Borchers <alborchers@steinerpoint.com>.
  29  *
  30  */
  31
  32 #include <linux/config.h>
  33 #include <linux/kernel.h>
  34 #include <linux/jiffies.h>
  35 #include <linux/errno.h>
  36 #include <linux/init.h>
  37 #include <linux/slab.h>
  38 #include <linux/tty.h>
  39 #include <linux/tty_driver.h>
  40 #include <linux/tty_flip.h>
  41 #include <linux/module.h>
  42 #include <linux/spinlock.h>
  43 #include <linux/serial.h>
  44 #include <linux/ioctl.h>
  45 #include <linux/wait.h>
  46 #include <asm/uaccess.h>
  47 #include <linux/usb.h>
  48 #include "usb-serial.h"
  49 #include "io_edgeport.h"
  50 #include "io_ionsp.h"           /* info for the iosp messages */
  51 #include "io_16654.h"           /* 16654 UART defines */
  52
  53 /*
  54  * Version Information
  55  */
  56 #define DRIVER_VERSION "v2.7"
  57 #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com> and David Iacovelli"
  58 #define DRIVER_DESC "Edgeport USB Serial Driver"
  59
  60 /* First, the latest boot code - for first generation edgeports */
  61 #define IMAGE_ARRAY_NAME        BootCodeImage_GEN1
  62 #define IMAGE_VERSION_NAME      BootCodeImageVersion_GEN1
  63 #include "io_fw_boot.h"         /* the bootloader firmware to download to a device, if it needs it */
  64
  65 /* for second generation edgeports */
  66 #define IMAGE_ARRAY_NAME        BootCodeImage_GEN2
  67 #define IMAGE_VERSION_NAME      BootCodeImageVersion_GEN2
  68 #include "io_fw_boot2.h"        /* the bootloader firmware to download to a device, if it needs it */
  69
  70 /* Then finally the main run-time operational code - for first generation edgeports */
  71 #define IMAGE_ARRAY_NAME        OperationalCodeImage_GEN1
  72 #define IMAGE_VERSION_NAME      OperationalCodeImageVersion_GEN1
  73 #include "io_fw_down.h"         /* Define array OperationalCodeImage[] */
  74
  75 /* for second generation edgeports */
  76 #define IMAGE_ARRAY_NAME        OperationalCodeImage_GEN2
  77 #define IMAGE_VERSION_NAME      OperationalCodeImageVersion_GEN2
  78 #include "io_fw_down2.h"        /* Define array OperationalCodeImage[] */
  79
  80 #define MAX_NAME_LEN            64
  81
  82 #define CHASE_TIMEOUT           (5*HZ)          /* 5 seconds */
  83 #define OPEN_TIMEOUT            (5*HZ)          /* 5 seconds */
  84 #define COMMAND_TIMEOUT         (5*HZ)          /* 5 seconds */
  85
  86 /* receive port state */
  87 enum RXSTATE {
  88         EXPECT_HDR1 = 0,        /* Expect header byte 1 */
  89         EXPECT_HDR2 = 1,        /* Expect header byte 2 */
  90         EXPECT_DATA = 2,        /* Expect 'RxBytesRemaining' data */
  91         EXPECT_HDR3 = 3,        /* Expect header byte 3 (for status hdrs only) */
  92 };
  93
  94
  95 /* Transmit Fifo
  96  * This Transmit queue is an extension of the edgeport Rx buffer.
  97  * The maximum amount of data buffered in both the edgeport
  98  * Rx buffer (maxTxCredits) and this buffer will never exceed maxTxCredits.
  99  */
 100 struct TxFifo {
 101         unsigned int    head;   /* index to head pointer (write) */
 102         unsigned int    tail;   /* index to tail pointer (read)  */
 103         unsigned int    count;  /* Bytes in queue */
 104         unsigned int    size;   /* Max size of queue (equal to Max number of TxCredits) */
 105         unsigned char   *fifo;  /* allocated Buffer */
 106 };
 107
 108 /* This structure holds all of the local port information */
 109 struct edgeport_port {
 110         __u16                   txCredits;              /* our current credits for this port */
 111         __u16                   maxTxCredits;           /* the max size of the port */
 112
 113         struct TxFifo           txfifo;                 /* transmit fifo -- size will be maxTxCredits */
 114         struct urb              *write_urb;             /* write URB for this port */
 115         char                    write_in_progress;      /* TRUE while a write URB is outstanding */
 116         spinlock_t              ep_lock;
 117
 118         __u8                    shadowLCR;              /* last LCR value received */
 119         __u8                    shadowMCR;              /* last MCR value received */
 120         __u8                    shadowMSR;              /* last MSR value received */
 121         __u8                    shadowLSR;              /* last LSR value received */
 122         __u8                    shadowXonChar;          /* last value set as XON char in Edgeport */
 123         __u8                    shadowXoffChar;         /* last value set as XOFF char in Edgeport */
 124         __u8                    validDataMask;
 125         __u32                   baudRate;
 126
 127         char                    open;
 128         char                    openPending;
 129         char                    commandPending;
 130         char                    closePending;
 131         char                    chaseResponsePending;
 132
 133         wait_queue_head_t       wait_chase;             /* for handling sleeping while waiting for chase to finish */
 134         wait_queue_head_t       wait_open;              /* for handling sleeping while waiting for open to finish */
 135         wait_queue_head_t       wait_command;           /* for handling sleeping while waiting for command to finish */
 136         wait_queue_head_t       delta_msr_wait;         /* for handling sleeping while waiting for msr change to happen */
 137
 138         struct async_icount     icount;
 139         struct usb_serial_port  *port;                  /* loop back to the owner of this object */
 140 };
 141
 142
 143 /* This structure holds all of the individual device information */
 144 struct edgeport_serial {
 145         char                    name[MAX_NAME_LEN+2];           /* string name of this device */
 146
 147         struct edge_manuf_descriptor    manuf_descriptor;       /* the manufacturer descriptor */
 148         struct edge_boot_descriptor     boot_descriptor;        /* the boot firmware descriptor */
 149         struct edgeport_product_info    product_info;           /* Product Info */
 150
 151         __u8                    interrupt_in_endpoint;          /* the interrupt endpoint handle */
 152         unsigned char *         interrupt_in_buffer;            /* the buffer we use for the interrupt endpoint */
 153         struct urb *            interrupt_read_urb;             /* our interrupt urb */
 154
 155         __u8                    bulk_in_endpoint;               /* the bulk in endpoint handle */
 156         unsigned char *         bulk_in_buffer;                 /* the buffer we use for the bulk in endpoint */
 157         struct urb *            read_urb;                       /* our bulk read urb */
 158         int                     read_in_progress;
 159         spinlock_t              es_lock;
 160
 161         __u8                    bulk_out_endpoint;              /* the bulk out endpoint handle */
 162
 163         __s16                   rxBytesAvail;                   /* the number of bytes that we need to read from this device */
 164
 165         enum RXSTATE            rxState;                        /* the current state of the bulk receive processor */
 166         __u8                    rxHeader1;                      /* receive header byte 1 */
 167         __u8                    rxHeader2;                      /* receive header byte 2 */
 168         __u8                    rxHeader3;                      /* receive header byte 3 */
 169         __u8                    rxPort;                         /* the port that we are currently receiving data for */
 170         __u8                    rxStatusCode;                   /* the receive status code */
 171         __u8                    rxStatusParam;                  /* the receive status paramater */
 172         __s16                   rxBytesRemaining;               /* the number of port bytes left to read */
 173         struct usb_serial       *serial;                        /* loop back to the owner of this object */
 174 };
 175
 176 /* baud rate information */
 177 struct divisor_table_entry {
 178         __u32   BaudRate;
 179         __u16  Divisor;
 180 };
 181
 182 //
 183 // Define table of divisors for Rev A EdgePort/4 hardware
 184 // These assume a 3.6864MHz crystal, the standard /16, and
 185 // MCR.7 = 0.
 186 //
 187 static const struct divisor_table_entry divisor_table[] = {
 188         {   50,         4608},
 189         {   75,         3072},
 190         {   110,        2095},          /* 2094.545455 => 230450   => .0217 % over */
 191         {   134,        1713},          /* 1713.011152 => 230398.5 => .00065% under */
 192         {   150,        1536},
 193         {   300,        768},
 194         {   600,        384},
 195         {   1200,       192},
 196         {   1800,       128},
 197         {   2400,       96},
 198         {   4800,       48},
 199         {   7200,       32},
 200         {   9600,       24},
 201         {   14400,      16},
 202         {   19200,      12},
 203         {   38400,      6},
 204         {   57600,      4},
 205         {   115200,     2},
 206         {   230400,     1},
 207 };
 208
 209 /* local variables */
 210 static int debug;
 211
 212 static int low_latency = 1;     /* tty low latency flag, on by default */
 213
 214 static int CmdUrbs = 0;         /* Number of outstanding Command Write Urbs */
 215
 216
 217 /* local function prototypes */
 218
 219 /* function prototypes for all URB callbacks */
 220 static void edge_interrupt_callback     (struct urb *urb, struct pt_regs *regs);
 221 static void edge_bulk_in_callback       (struct urb *urb, struct pt_regs *regs);
 222 static void edge_bulk_out_data_callback (struct urb *urb, struct pt_regs *regs);
 223 static void edge_bulk_out_cmd_callback  (struct urb *urb, struct pt_regs *regs);
 224
 225 /* function prototypes for the usbserial callbacks */
 226 static int  edge_open                   (struct usb_serial_port *port, struct file *filp);
 227 static void edge_close                  (struct usb_serial_port *port, struct file *filp);
 228 static int  edge_write                  (struct usb_serial_port *port, const unsigned char *buf, int count);
 229 static int  edge_write_room             (struct usb_serial_port *port);
 230 static int  edge_chars_in_buffer        (struct usb_serial_port *port);
 231 static void edge_throttle               (struct usb_serial_port *port);
 232 static void edge_unthrottle             (struct usb_serial_port *port);
 233 static void edge_set_termios            (struct usb_serial_port *port, struct termios *old_termios);
 234 static int  edge_ioctl                  (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg);
 235 static void edge_break                  (struct usb_serial_port *port, int break_state);
 236 static int  edge_tiocmget               (struct usb_serial_port *port, struct file *file);
 237 static int  edge_tiocmset               (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
 238 static int  edge_startup                (struct usb_serial *serial);
 239 static void edge_shutdown               (struct usb_serial *serial);
 240
 241
 242 #include "io_tables.h"  /* all of the devices that this driver supports */
 243
 244 static struct usb_driver io_driver = {
 245         .name =         "io_edgeport",
 246         .probe =        usb_serial_probe,
 247         .disconnect =   usb_serial_disconnect,
 248         .id_table =     id_table_combined,
 249         .no_dynamic_id =        1,
 250 };
 251
 252 /* function prototypes for all of our local functions */
 253 static void  process_rcvd_data          (struct edgeport_serial *edge_serial, unsigned char *buffer, __u16 bufferLength);
 254 static void process_rcvd_status         (struct edgeport_serial *edge_serial, __u8 byte2, __u8 byte3);
 255 static void edge_tty_recv                       (struct device *dev, struct tty_struct *tty, unsigned char *data, int length);
 256 static void handle_new_msr              (struct edgeport_port *edge_port, __u8 newMsr);
 257 static void handle_new_lsr              (struct edgeport_port *edge_port, __u8 lsrData, __u8 lsr, __u8 data);
 258 static int  send_iosp_ext_cmd           (struct edgeport_port *edge_port, __u8 command, __u8 param);
 259 static int  calc_baud_rate_divisor      (int baud_rate, int *divisor);
 260 static int  send_cmd_write_baud_rate    (struct edgeport_port *edge_port, int baudRate);
 261 static void change_port_settings        (struct edgeport_port *edge_port, struct termios *old_termios);
 262 static int  send_cmd_write_uart_register        (struct edgeport_port *edge_port, __u8 regNum, __u8 regValue);
 263 static int  write_cmd_usb               (struct edgeport_port *edge_port, unsigned char *buffer, int writeLength);
 264 static void send_more_port_data         (struct edgeport_serial *edge_serial, struct edgeport_port *edge_port);
 265
 266 static int  sram_write                  (struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data);
 267 static int  rom_read                    (struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data);
 268 static int  rom_write                   (struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data);
 269 static void get_manufacturing_desc      (struct edgeport_serial *edge_serial);
 270 static void get_boot_desc               (struct edgeport_serial *edge_serial);
 271 static void load_application_firmware   (struct edgeport_serial *edge_serial);
 272
 273 static void unicode_to_ascii(char *string, int buflen, __le16 *unicode, int unicode_size);
 274
 275
 276 // ************************************************************************
 277 // ************************************************************************
 278 // ************************************************************************
 279 // ************************************************************************
 280
 281 /************************************************************************
 282  *                                                                      *
 283  * update_edgeport_E2PROM()     Compare current versions of             *
 284  *                              Boot ROM and Manufacture                *
 285  *                              Descriptors with versions               *
 286  *                              embedded in this driver                 *
 287  *                                                                      *
 288  ************************************************************************/
 289 static void update_edgeport_E2PROM (struct edgeport_serial *edge_serial)
 290 {
 291         __u32 BootCurVer;
 292         __u32 BootNewVer;
 293         __u8 BootMajorVersion;
 294         __u8 BootMinorVersion;
 295         __le16 BootBuildNumber;
 296         __u8 *BootImage;
 297         __u32 BootSize;
 298         struct edge_firmware_image_record *record;
 299         unsigned char *firmware;
 300         int response;
 301
 302
 303         switch (edge_serial->product_info.iDownloadFile) {
 304                 case EDGE_DOWNLOAD_FILE_I930:
 305                         BootMajorVersion        = BootCodeImageVersion_GEN1.MajorVersion;
 306                         BootMinorVersion        = BootCodeImageVersion_GEN1.MinorVersion;
 307                         BootBuildNumber         = cpu_to_le16(BootCodeImageVersion_GEN1.BuildNumber);
 308                         BootImage               = &BootCodeImage_GEN1[0];
 309                         BootSize                = sizeof( BootCodeImage_GEN1 );
 310                         break;
 311
 312                 case EDGE_DOWNLOAD_FILE_80251:
 313                         BootMajorVersion        = BootCodeImageVersion_GEN2.MajorVersion;
 314                         BootMinorVersion        = BootCodeImageVersion_GEN2.MinorVersion;
 315                         BootBuildNumber         = cpu_to_le16(BootCodeImageVersion_GEN2.BuildNumber);
 316                         BootImage               = &BootCodeImage_GEN2[0];
 317                         BootSize                = sizeof( BootCodeImage_GEN2 );
 318                         break;
 319
 320                 default:
 321                         return;
 322         }
 323
 324         // Check Boot Image Version
 325         BootCurVer = (edge_serial->boot_descriptor.MajorVersion << 24) +
 326                      (edge_serial->boot_descriptor.MinorVersion << 16) +
 327                       le16_to_cpu(edge_serial->boot_descriptor.BuildNumber);
 328
 329         BootNewVer = (BootMajorVersion << 24) +
 330                      (BootMinorVersion << 16) +
 331                       le16_to_cpu(BootBuildNumber);
 332
 333         dbg("Current Boot Image version %d.%d.%d",
 334             edge_serial->boot_descriptor.MajorVersion,
 335             edge_serial->boot_descriptor.MinorVersion,
 336             le16_to_cpu(edge_serial->boot_descriptor.BuildNumber));
 337
 338
 339         if (BootNewVer > BootCurVer) {
 340                 dbg("**Update Boot Image from %d.%d.%d to %d.%d.%d",
 341                     edge_serial->boot_descriptor.MajorVersion,
 342                     edge_serial->boot_descriptor.MinorVersion,
 343                     le16_to_cpu(edge_serial->boot_descriptor.BuildNumber),
 344                     BootMajorVersion,
 345                     BootMinorVersion,
 346                     le16_to_cpu(BootBuildNumber));
 347
 348
 349                 dbg("Downloading new Boot Image");
 350
 351                 firmware = BootImage;
 352
 353                 for (;;) {
 354                         record = (struct edge_firmware_image_record *)firmware;
 355                         response = rom_write (edge_serial->serial, le16_to_cpu(record->ExtAddr), le16_to_cpu(record->Addr), le16_to_cpu(record->Len), &record->Data[0]);
 356                         if (response < 0) {
 357                                 dev_err(&edge_serial->serial->dev->dev, "rom_write failed (%x, %x, %d)\n", le16_to_cpu(record->ExtAddr), le16_to_cpu(record->Addr), le16_to_cpu(record->Len));
 358                                 break;
 359                         }
 360                         firmware += sizeof (struct edge_firmware_image_record) + le16_to_cpu(record->Len);
 361                         if (firmware >= &BootImage[BootSize]) {
 362                                 break;
 363                         }
 364                 }
 365         } else {
 366                 dbg("Boot Image -- already up to date");
 367         }
 368 }
 369
 370
 371 /************************************************************************
 372  *                                                                      *
 373  *  Get string descriptor from device                                   *
 374  *                                                                      *
 375  ************************************************************************/
 376 static int get_string (struct usb_device *dev, int Id, char *string, int buflen)
 377 {
 378         struct usb_string_descriptor StringDesc;
 379         struct usb_string_descriptor *pStringDesc;
 380
 381         dbg("%s - USB String ID = %d", __FUNCTION__, Id );
 382
 383         if (!usb_get_descriptor(dev, USB_DT_STRING, Id, &StringDesc, sizeof(StringDesc))) {
 384                 return 0;
 385         }
 386
 387         pStringDesc = kmalloc (StringDesc.bLength, GFP_KERNEL);
 388
 389         if (!pStringDesc) {
 390                 return 0;
 391         }
 392
 393         if (!usb_get_descriptor(dev, USB_DT_STRING, Id, pStringDesc, StringDesc.bLength )) {
 394                 kfree(pStringDesc);
 395                 return 0;
 396         }
 397
 398         unicode_to_ascii(string, buflen, pStringDesc->wData, pStringDesc->bLength/2);
 399
 400         kfree(pStringDesc);
 401         return strlen(string);
 402 }
 403
 404
 405 #if 0
 406 /************************************************************************
 407  *
 408  *  Get string descriptor from device
 409  *
 410  ************************************************************************/
 411 static int get_string_desc (struct usb_device *dev, int Id, struct usb_string_descriptor **pRetDesc)
 412 {
 413         struct usb_string_descriptor StringDesc;
 414         struct usb_string_descriptor *pStringDesc;
 415
 416         dbg("%s - USB String ID = %d", __FUNCTION__, Id );
 417
 418         if (!usb_get_descriptor(dev, USB_DT_STRING, Id, &StringDesc, sizeof(StringDesc))) {
 419                 return 0;
 420         }
 421
 422         pStringDesc = kmalloc (StringDesc.bLength, GFP_KERNEL);
 423
 424         if (!pStringDesc) {
 425                 return -1;
 426         }
 427
 428         if (!usb_get_descriptor(dev, USB_DT_STRING, Id, pStringDesc, StringDesc.bLength )) {
 429                 kfree(pStringDesc);
 430                 return -1;
 431         }
 432
 433         *pRetDesc = pStringDesc;
 434         return 0;
 435 }
 436 #endif
 437
 438 static void get_product_info(struct edgeport_serial *edge_serial)
 439 {
 440         struct edgeport_product_info *product_info = &edge_serial->product_info;
 441
 442         memset (product_info, 0, sizeof(struct edgeport_product_info));
 443
 444         product_info->ProductId         = (__u16)(le16_to_cpu(edge_serial->serial->dev->descriptor.idProduct) & ~ION_DEVICE_ID_80251_NETCHIP);
 445         product_info->NumPorts          = edge_serial->manuf_descriptor.NumPorts;
 446         product_info->ProdInfoVer       = 0;
 447
 448         product_info->RomSize           = edge_serial->manuf_descriptor.RomSize;
 449         product_info->RamSize           = edge_serial->manuf_descriptor.RamSize;
 450         product_info->CpuRev            = edge_serial->manuf_descriptor.CpuRev;
 451         product_info->BoardRev          = edge_serial->manuf_descriptor.BoardRev;
 452
 453         product_info->BootMajorVersion  = edge_serial->boot_descriptor.MajorVersion;
 454         product_info->BootMinorVersion  = edge_serial->boot_descriptor.MinorVersion;
 455         product_info->BootBuildNumber   = edge_serial->boot_descriptor.BuildNumber;
 456
 457         memcpy(product_info->ManufactureDescDate, edge_serial->manuf_descriptor.DescDate, sizeof(edge_serial->manuf_descriptor.DescDate));
 458
 459         // check if this is 2nd generation hardware
 460         if (le16_to_cpu(edge_serial->serial->dev->descriptor.idProduct) & ION_DEVICE_ID_80251_NETCHIP) {
 461                 product_info->FirmwareMajorVersion      = OperationalCodeImageVersion_GEN2.MajorVersion;
 462                 product_info->FirmwareMinorVersion      = OperationalCodeImageVersion_GEN2.MinorVersion;
 463                 product_info->FirmwareBuildNumber       = cpu_to_le16(OperationalCodeImageVersion_GEN2.BuildNumber);
 464                 product_info->iDownloadFile             = EDGE_DOWNLOAD_FILE_80251;
 465         } else {
 466                 product_info->FirmwareMajorVersion      = OperationalCodeImageVersion_GEN1.MajorVersion;
 467                 product_info->FirmwareMinorVersion      = OperationalCodeImageVersion_GEN1.MinorVersion;
 468                 product_info->FirmwareBuildNumber       = cpu_to_le16(OperationalCodeImageVersion_GEN1.BuildNumber);
 469                 product_info->iDownloadFile             = EDGE_DOWNLOAD_FILE_I930;
 470         }
 471
 472         // Determine Product type and set appropriate flags
 473         switch (DEVICE_ID_FROM_USB_PRODUCT_ID(product_info->ProductId)) {
 474                 case ION_DEVICE_ID_EDGEPORT_COMPATIBLE:
 475                 case ION_DEVICE_ID_EDGEPORT_4T:
 476                 case ION_DEVICE_ID_EDGEPORT_4:
 477                 case ION_DEVICE_ID_EDGEPORT_2:
 478                 case ION_DEVICE_ID_EDGEPORT_8_DUAL_CPU:
 479                 case ION_DEVICE_ID_EDGEPORT_8:
 480                 case ION_DEVICE_ID_EDGEPORT_421:
 481                 case ION_DEVICE_ID_EDGEPORT_21:
 482                 case ION_DEVICE_ID_EDGEPORT_2_DIN:
 483                 case ION_DEVICE_ID_EDGEPORT_4_DIN:
 484                 case ION_DEVICE_ID_EDGEPORT_16_DUAL_CPU:
 485                         product_info->IsRS232 = 1;
 486                         break;
 487
 488                 case ION_DEVICE_ID_EDGEPORT_2I:                            // Edgeport/2 RS422/RS485
 489                         product_info->IsRS422 = 1;
 490                         product_info->IsRS485 = 1;
 491                         break;
 492
 493                 case ION_DEVICE_ID_EDGEPORT_8I:                            // Edgeport/4 RS422
 494                 case ION_DEVICE_ID_EDGEPORT_4I:                            // Edgeport/4 RS422
 495                         product_info->IsRS422 = 1;
 496                         break;
 497         }
 498
 499         // Dump Product Info structure
 500         dbg("**Product Information:");
 501         dbg("  ProductId             %x", product_info->ProductId );
 502         dbg("  NumPorts              %d", product_info->NumPorts );
 503         dbg("  ProdInfoVer           %d", product_info->ProdInfoVer );
 504         dbg("  IsServer              %d", product_info->IsServer);
 505         dbg("  IsRS232               %d", product_info->IsRS232 );
 506         dbg("  IsRS422               %d", product_info->IsRS422 );
 507         dbg("  IsRS485               %d", product_info->IsRS485 );
 508         dbg("  RomSize               %d", product_info->RomSize );
 509         dbg("  RamSize               %d", product_info->RamSize );
 510         dbg("  CpuRev                %x", product_info->CpuRev  );
 511         dbg("  BoardRev              %x", product_info->BoardRev);
 512         dbg("  BootMajorVersion      %d.%d.%d", product_info->BootMajorVersion,
 513             product_info->BootMinorVersion,
 514             le16_to_cpu(product_info->BootBuildNumber));
 515         dbg("  FirmwareMajorVersion  %d.%d.%d", product_info->FirmwareMajorVersion,
 516             product_info->FirmwareMinorVersion,
 517             le16_to_cpu(product_info->FirmwareBuildNumber));
 518         dbg("  ManufactureDescDate   %d/%d/%d", product_info->ManufactureDescDate[0],
 519             product_info->ManufactureDescDate[1],
 520             product_info->ManufactureDescDate[2]+1900);
 521         dbg("  iDownloadFile         0x%x",     product_info->iDownloadFile);
 522
 523 }
 524
 525
 526 /************************************************************************/
 527 /************************************************************************/
 528 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 529 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 530 /************************************************************************/
 531 /************************************************************************/
 532
 533 /*****************************************************************************
 534  * edge_interrupt_callback
 535  *      this is the callback function for when we have received data on the
 536  *      interrupt endpoint.
 537  *****************************************************************************/
 538 static void edge_interrupt_callback (struct urb *urb, struct pt_regs *regs)
 539 {
 540         struct edgeport_serial  *edge_serial = (struct edgeport_serial *)urb->context;
 541         struct edgeport_port *edge_port;
 542         struct usb_serial_port *port;
 543         unsigned char *data = urb->transfer_buffer;
 544         int length = urb->actual_length;
 545         int bytes_avail;
 546         int position;
 547         int txCredits;
 548         int portNumber;
 549         int result;
 550
 551         dbg("%s", __FUNCTION__);
 552
 553         switch (urb->status) {
 554         case 0:
 555                 /* success */
 556                 break;
 557         case -ECONNRESET:
 558         case -ENOENT:
 559         case -ESHUTDOWN:
 560                 /* this urb is terminated, clean up */
 561                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 562                 return;
 563         default:
 564                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
 565                 goto exit;
 566         }
 567
 568         // process this interrupt-read even if there are no ports open
 569         if (length) {
 570                 usb_serial_debug_data(debug, &edge_serial->serial->dev->dev, __FUNCTION__, length, data);
 571
 572                 if (length > 1) {
 573                         bytes_avail = data[0] | (data[1] << 8);
 574                         if (bytes_avail) {
 575                                 spin_lock(&edge_serial->es_lock);
 576                                 edge_serial->rxBytesAvail += bytes_avail;
 577                                 dbg("%s - bytes_avail=%d, rxBytesAvail=%d, read_in_progress=%d", __FUNCTION__, bytes_avail, edge_serial->rxBytesAvail, edge_serial->read_in_progress);
 578
 579                                 if (edge_serial->rxBytesAvail > 0 &&
 580                                     !edge_serial->read_in_progress) {
 581                                         dbg("%s - posting a read", __FUNCTION__);
 582                                         edge_serial->read_in_progress = TRUE;
 583
 584                                         /* we have pending bytes on the bulk in pipe, send a request */
 585                                         edge_serial->read_urb->dev = edge_serial->serial->dev;
 586                                         result = usb_submit_urb(edge_serial->read_urb, GFP_ATOMIC);
 587                                         if (result) {
 588                                                 dev_err(&edge_serial->serial->dev->dev, "%s - usb_submit_urb(read bulk) failed with result = %d\n", __FUNCTION__, result);
 589                                                 edge_serial->read_in_progress = FALSE;
 590                                         }
 591                                 }
 592                                 spin_unlock(&edge_serial->es_lock);
 593                         }
 594                 }
 595                 /* grab the txcredits for the ports if available */
 596                 position = 2;
 597                 portNumber = 0;
 598                 while ((position < length) && (portNumber < edge_serial->serial->num_ports)) {
 599                         txCredits = data[position] | (data[position+1] << 8);
 600                         if (txCredits) {
 601                                 port = edge_serial->serial->port[portNumber];
 602                                 edge_port = usb_get_serial_port_data(port);
 603                                 if (edge_port->open) {
 604                                         spin_lock(&edge_port->ep_lock);
 605                                         edge_port->txCredits += txCredits;
 606                                         spin_unlock(&edge_port->ep_lock);
 607                                         dbg("%s - txcredits for port%d = %d", __FUNCTION__, portNumber, edge_port->txCredits);
 608
 609                                         /* tell the tty driver that something has changed */
 610                                         if (edge_port->port->tty)
 611                                                 tty_wakeup(edge_port->port->tty);
 612
 613                                         // Since we have more credit, check if more data can be sent
 614                                         send_more_port_data(edge_serial, edge_port);
 615                                 }
 616                         }
 617                         position += 2;
 618                         ++portNumber;
 619                 }
 620         }
 621
 622 exit:
 623         result = usb_submit_urb (urb, GFP_ATOMIC);
 624         if (result) {
 625                 dev_err(&urb->dev->dev, "%s - Error %d submitting control urb\n", __FUNCTION__, result);
 626         }
 627 }
 628
 629
 630 /*****************************************************************************
 631  * edge_bulk_in_callback
 632  *      this is the callback function for when we have received data on the
 633  *      bulk in endpoint.
 634  *****************************************************************************/
 635 static void edge_bulk_in_callback (struct urb *urb, struct pt_regs *regs)
 636 {
 637         struct edgeport_serial  *edge_serial = (struct edgeport_serial *)urb->context;
 638         unsigned char           *data = urb->transfer_buffer;
 639         int                     status;
 640         __u16                   raw_data_length;
 641
 642         dbg("%s", __FUNCTION__);
 643
 644         if (urb->status) {
 645                 dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
 646                 edge_serial->read_in_progress = FALSE;
 647                 return;
 648         }
 649
 650         if (urb->actual_length == 0) {
 651                 dbg("%s - read bulk callback with no data", __FUNCTION__);
 652                 edge_serial->read_in_progress = FALSE;
 653                 return;
 654         }
 655
 656         raw_data_length = urb->actual_length;
 657
 658         usb_serial_debug_data(debug, &edge_serial->serial->dev->dev, __FUNCTION__, raw_data_length, data);
 659
 660         spin_lock(&edge_serial->es_lock);
 661
 662         /* decrement our rxBytes available by the number that we just got */
 663         edge_serial->rxBytesAvail -= raw_data_length;
 664
 665         dbg("%s - Received = %d, rxBytesAvail %d", __FUNCTION__, raw_data_length, edge_serial->rxBytesAvail);
 666
 667         process_rcvd_data (edge_serial, data, urb->actual_length);
 668
 669         /* check to see if there's any more data for us to read */
 670         if (edge_serial->rxBytesAvail > 0) {
 671                 dbg("%s - posting a read", __FUNCTION__);
 672                 edge_serial->read_urb->dev = edge_serial->serial->dev;
 673                 status = usb_submit_urb(edge_serial->read_urb, GFP_ATOMIC);
 674                 if (status) {
 675                         dev_err(&urb->dev->dev, "%s - usb_submit_urb(read bulk) failed, status = %d\n", __FUNCTION__, status);
 676                         edge_serial->read_in_progress = FALSE;
 677                 }
 678         } else {
 679                 edge_serial->read_in_progress = FALSE;
 680         }
 681
 682         spin_unlock(&edge_serial->es_lock);
 683 }
 684
 685
 686 /*****************************************************************************
 687  * edge_bulk_out_data_callback
 688  *      this is the callback function for when we have finished sending serial data
 689  *      on the bulk out endpoint.
 690  *****************************************************************************/
 691 static void edge_bulk_out_data_callback (struct urb *urb, struct pt_regs *regs)
 692 {
 693         struct edgeport_port *edge_port = (struct edgeport_port *)urb->context;
 694         struct tty_struct *tty;
 695
 696         dbg("%s", __FUNCTION__);
 697
 698         if (urb->status) {
 699                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
 700         }
 701
 702         tty = edge_port->port->tty;
 703
 704         if (tty && edge_port->open) {
 705                 /* let the tty driver wakeup if it has a special write_wakeup function */
 706                 tty_wakeup(tty);
 707         }
 708
 709         // Release the Write URB
 710         edge_port->write_in_progress = FALSE;
 711
 712         // Check if more data needs to be sent
 713         send_more_port_data((struct edgeport_serial *)(usb_get_serial_data(edge_port->port->serial)), edge_port);
 714 }
 715
 716
 717 /*****************************************************************************
 718  * BulkOutCmdCallback
 719  *      this is the callback function for when we have finished sending a command
 720  *      on the bulk out endpoint.
 721  *****************************************************************************/
 722 static void edge_bulk_out_cmd_callback (struct urb *urb, struct pt_regs *regs)
 723 {
 724         struct edgeport_port *edge_port = (struct edgeport_port *)urb->context;
 725         struct tty_struct *tty;
 726         int status = urb->status;
 727
 728         dbg("%s", __FUNCTION__);
 729
 730         CmdUrbs--;
 731         dbg("%s - FREE URB %p (outstanding %d)", __FUNCTION__, urb, CmdUrbs);
 732
 733
 734         /* clean up the transfer buffer */
 735         kfree(urb->transfer_buffer);
 736
 737         /* Free the command urb */
 738         usb_free_urb (urb);
 739
 740         if (status) {
 741                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, status);
 742                 return;
 743         }
 744
 745         /* Get pointer to tty */
 746         tty = edge_port->port->tty;
 747
 748         /* tell the tty driver that something has changed */
 749         if (tty && edge_port->open)
 750                 tty_wakeup(tty);
 751
 752         /* we have completed the command */
 753         edge_port->commandPending = FALSE;
 754         wake_up(&edge_port->wait_command);
 755 }
 756
 757
 758 /*****************************************************************************
 759  * Driver tty interface functions
 760  *****************************************************************************/
 761
 762 /*****************************************************************************
 763  * SerialOpen
 764  *      this function is called by the tty driver when a port is opened
 765  *      If successful, we return 0
 766  *      Otherwise we return a negative error number.
 767  *****************************************************************************/
 768 static int edge_open (struct usb_serial_port *port, struct file * filp)
 769 {
 770         struct edgeport_port *edge_port = usb_get_serial_port_data(port);
 771         struct usb_serial *serial;
 772         struct edgeport_serial *edge_serial;
 773         int response;
 774
 775         dbg("%s - port %d", __FUNCTION__, port->number);
 776
 777         if (edge_port == NULL)
 778                 return -ENODEV;
 779
 780         if (port->tty)
 781                 port->tty->low_latency = low_latency;
 782
 783         /* see if we've set up our endpoint info yet (can't set it up in edge_startup
 784            as the structures were not set up at that time.) */
 785         serial = port->serial;
 786         edge_serial = usb_get_serial_data(serial);
 787         if (edge_serial == NULL) {
 788                 return -ENODEV;
 789         }
 790         if (edge_serial->interrupt_in_buffer == NULL) {
 791                 struct usb_serial_port *port0 = serial->port[0];
 792
 793                 /* not set up yet, so do it now */
 794                 edge_serial->interrupt_in_buffer = port0->interrupt_in_buffer;
 795                 edge_serial->interrupt_in_endpoint = port0->interrupt_in_endpointAddress;
 796                 edge_serial->interrupt_read_urb = port0->interrupt_in_urb;
 797                 edge_serial->bulk_in_buffer = port0->bulk_in_buffer;
 798                 edge_serial->bulk_in_endpoint = port0->bulk_in_endpointAddress;
 799                 edge_serial->read_urb = port0->read_urb;
 800                 edge_serial->bulk_out_endpoint = port0->bulk_out_endpointAddress;
 801
 802                 /* set up our interrupt urb */
 803                 usb_fill_int_urb(edge_serial->interrupt_read_urb,
 804                                  serial->dev,
 805                                  usb_rcvintpipe(serial->dev,
 806                                                 port0->interrupt_in_endpointAddress),
 807                                  port0->interrupt_in_buffer,
 808                                  edge_serial->interrupt_read_urb->transfer_buffer_length,
 809                                  edge_interrupt_callback, edge_serial,
 810                                  edge_serial->interrupt_read_urb->interval);
 811
 812                 /* set up our bulk in urb */
 813                 usb_fill_bulk_urb(edge_serial->read_urb, serial->dev,
 814                                   usb_rcvbulkpipe(serial->dev,
 815                                                   port0->bulk_in_endpointAddress),
 816                                   port0->bulk_in_buffer,
 817                                   edge_serial->read_urb->transfer_buffer_length,
 818                                   edge_bulk_in_callback, edge_serial);
 819                 edge_serial->read_in_progress = FALSE;
 820
 821                 /* start interrupt read for this edgeport
 822                  * this interrupt will continue as long as the edgeport is connected */
 823                 response = usb_submit_urb (edge_serial->interrupt_read_urb, GFP_KERNEL);
 824                 if (response) {
 825                         dev_err(&port->dev, "%s - Error %d submitting control urb\n", __FUNCTION__, response);
 826                 }
 827         }
 828
 829         /* initialize our wait queues */
 830         init_waitqueue_head(&edge_port->wait_open);
 831         init_waitqueue_head(&edge_port->wait_chase);
 832         init_waitqueue_head(&edge_port->delta_msr_wait);
 833         init_waitqueue_head(&edge_port->wait_command);
 834
 835         /* initialize our icount structure */
 836         memset (&(edge_port->icount), 0x00, sizeof(edge_port->icount));
 837
 838         /* initialize our port settings */
 839         edge_port->txCredits            = 0;                    /* Can't send any data yet */
 840         edge_port->shadowMCR            = MCR_MASTER_IE;        /* Must always set this bit to enable ints! */
 841         edge_port->chaseResponsePending = FALSE;
 842
 843         /* send a open port command */
 844         edge_port->openPending = TRUE;
 845         edge_port->open        = FALSE;
 846         response = send_iosp_ext_cmd (edge_port, IOSP_CMD_OPEN_PORT, 0);
 847
 848         if (response < 0) {
 849                 dev_err(&port->dev, "%s - error sending open port command\n", __FUNCTION__);
 850                 edge_port->openPending = FALSE;
 851                 return -ENODEV;
 852         }
 853
 854         /* now wait for the port to be completely opened */
 855         wait_event_timeout(edge_port->wait_open, (edge_port->openPending != TRUE), OPEN_TIMEOUT);
 856
 857         if (edge_port->open == FALSE) {
 858                 /* open timed out */
 859                 dbg("%s - open timedout", __FUNCTION__);
 860                 edge_port->openPending = FALSE;
 861                 return -ENODEV;
 862         }
 863
 864         /* create the txfifo */
 865         edge_port->txfifo.head  = 0;
 866         edge_port->txfifo.tail  = 0;
 867         edge_port->txfifo.count = 0;
 868         edge_port->txfifo.size  = edge_port->maxTxCredits;
 869         edge_port->txfifo.fifo  = kmalloc (edge_port->maxTxCredits, GFP_KERNEL);
 870
 871         if (!edge_port->txfifo.fifo) {
 872                 dbg("%s - no memory", __FUNCTION__);
 873                 edge_close (port, filp);
 874                 return -ENOMEM;
 875         }
 876
 877         /* Allocate a URB for the write */
 878         edge_port->write_urb = usb_alloc_urb (0, GFP_KERNEL);
 879         edge_port->write_in_progress = FALSE;
 880
 881         if (!edge_port->write_urb) {
 882                 dbg("%s - no memory", __FUNCTION__);
 883                 edge_close (port, filp);
 884                 return -ENOMEM;
 885         }
 886
 887         dbg("%s(%d) - Initialize TX fifo to %d bytes", __FUNCTION__, port->number, edge_port->maxTxCredits);
 888
 889         dbg("%s exited", __FUNCTION__);
 890
 891         return 0;
 892 }
 893
 894
 895 /************************************************************************
 896  *
 897  * block_until_chase_response
 898  *
 899  *      This function will block the close until one of the following:
 900  *              1. Response to our Chase comes from Edgeport
 901  *              2. A timout of 10 seconds without activity has expired
 902  *                 (1K of Edgeport data @ 2400 baud ==> 4 sec to empty)
 903  *
 904  ************************************************************************/
 905 static void block_until_chase_response(struct edgeport_port *edge_port)
 906 {
 907         DEFINE_WAIT(wait);
 908         __u16 lastCredits;
 909         int timeout = 1*HZ;
 910         int loop = 10;
 911
 912         while (1) {
 913                 // Save Last credits
 914                 lastCredits = edge_port->txCredits;
 915
 916                 // Did we get our Chase response
 917                 if (edge_port->chaseResponsePending == FALSE) {
 918                         dbg("%s - Got Chase Response", __FUNCTION__);
 919
 920                         // did we get all of our credit back?
 921                         if (edge_port->txCredits == edge_port->maxTxCredits ) {
 922                                 dbg("%s - Got all credits", __FUNCTION__);
 923                                 return;
 924                         }
 925                 }
 926
 927                 // Block the thread for a while
 928                 prepare_to_wait(&edge_port->wait_chase, &wait, TASK_UNINTERRUPTIBLE);
 929                 schedule_timeout(timeout);
 930                 finish_wait(&edge_port->wait_chase, &wait);
 931
 932                 if (lastCredits == edge_port->txCredits) {
 933                         // No activity.. count down.
 934                         loop--;
 935                         if (loop == 0) {
 936                                 edge_port->chaseResponsePending = FALSE;
 937                                 dbg("%s - Chase TIMEOUT", __FUNCTION__);
 938                                 return;
 939                         }
 940                 } else {
 941                         // Reset timout value back to 10 seconds
 942                         dbg("%s - Last %d, Current %d", __FUNCTION__, lastCredits, edge_port->txCredits);
 943                         loop = 10;
 944                 }
 945         }
 946 }
 947
 948
 949 /************************************************************************
 950  *
 951  * block_until_tx_empty
 952  *
 953  *      This function will block the close until one of the following:
 954  *              1. TX count are 0
 955  *              2. The edgeport has stopped
 956  *              3. A timout of 3 seconds without activity has expired
 957  *
 958  ************************************************************************/
 959 static void block_until_tx_empty (struct edgeport_port *edge_port)
 960 {
 961         DEFINE_WAIT(wait);
 962         struct TxFifo *fifo = &edge_port->txfifo;
 963         __u32 lastCount;
 964         int timeout = HZ/10;
 965         int loop = 30;
 966
 967         while (1) {
 968                 // Save Last count
 969                 lastCount = fifo->count;
 970
 971                 // Is the Edgeport Buffer empty?
 972                 if (lastCount == 0) {
 973                         dbg("%s - TX Buffer Empty", __FUNCTION__);
 974                         return;
 975                 }
 976
 977                 // Block the thread for a while
 978                 prepare_to_wait (&edge_port->wait_chase, &wait, TASK_UNINTERRUPTIBLE);
 979                 schedule_timeout(timeout);
 980                 finish_wait(&edge_port->wait_chase, &wait);
 981
 982                 dbg("%s wait", __FUNCTION__);
 983
 984                 if (lastCount == fifo->count) {
 985                         // No activity.. count down.
 986                         loop--;
 987                         if (loop == 0) {
 988                                 dbg("%s - TIMEOUT", __FUNCTION__);
 989                                 return;
 990                         }
 991                 } else {
 992                         // Reset timout value back to seconds
 993                         loop = 30;
 994                 }
 995         }
 996 }
 997
 998
 999 /*****************************************************************************
1000  * edge_close
1001  *      this function is called by the tty driver when a port is closed
1002  *****************************************************************************/
1003 static void edge_close (struct usb_serial_port *port, struct file * filp)
1004 {
1005         struct edgeport_serial *edge_serial;
1006         struct edgeport_port *edge_port;
1007         int status;
1008
1009         dbg("%s - port %d", __FUNCTION__, port->number);
1010
1011         edge_serial = usb_get_serial_data(port->serial);
1012         edge_port = usb_get_serial_port_data(port);
1013         if ((edge_serial == NULL) || (edge_port == NULL))
1014                 return;
1015
1016         // block until tx is empty
1017         block_until_tx_empty(edge_port);
1018
1019         edge_port->closePending = TRUE;
1020
1021         /* flush and chase */
1022         edge_port->chaseResponsePending = TRUE;
1023
1024         dbg("%s - Sending IOSP_CMD_CHASE_PORT", __FUNCTION__);
1025         status = send_iosp_ext_cmd (edge_port, IOSP_CMD_CHASE_PORT, 0);
1026         if (status == 0) {
1027                 // block until chase finished
1028                 block_until_chase_response(edge_port);
1029         } else {
1030                 edge_port->chaseResponsePending = FALSE;
1031         }
1032
1033         /* close the port */
1034         dbg("%s - Sending IOSP_CMD_CLOSE_PORT", __FUNCTION__);
1035         send_iosp_ext_cmd (edge_port, IOSP_CMD_CLOSE_PORT, 0);
1036
1037         //port->close = TRUE;
1038         edge_port->closePending = FALSE;
1039         edge_port->open = FALSE;
1040         edge_port->openPending = FALSE;
1041
1042         if (edge_port->write_urb) {
1043                 usb_kill_urb(edge_port->write_urb);
1044         }
1045
1046         if (edge_port->write_urb) {
1047                 /* if this urb had a transfer buffer already (old transfer) free it */
1048                 kfree(edge_port->write_urb->transfer_buffer);
1049                 usb_free_urb(edge_port->write_urb);
1050                 edge_port->write_urb = NULL;
1051         }
1052         kfree(edge_port->txfifo.fifo);
1053         edge_port->txfifo.fifo = NULL;
1054
1055         dbg("%s exited", __FUNCTION__);
1056 }
1057
1058 /*****************************************************************************
1059  * SerialWrite
1060  *      this function is called by the tty driver when data should be written to
1061  *      the port.
1062  *      If successful, we return the number of bytes written, otherwise we return
1063  *      a negative error number.
1064  *****************************************************************************/
1065 static int edge_write (struct usb_serial_port *port, const unsigned char *data, int count)
1066 {
1067         struct edgeport_port *edge_port = usb_get_serial_port_data(port);
1068         struct TxFifo *fifo;
1069         int copySize;
1070         int bytesleft;
1071         int firsthalf;
1072         int secondhalf;
1073         unsigned long flags;
1074
1075         dbg("%s - port %d", __FUNCTION__, port->number);
1076
1077         if (edge_port == NULL)
1078                 return -ENODEV;
1079
1080         // get a pointer to the Tx fifo
1081         fifo = &edge_port->txfifo;
1082
1083         spin_lock_irqsave(&edge_port->ep_lock, flags);
1084
1085         // calculate number of bytes to put in fifo
1086         copySize = min ((unsigned int)count, (edge_port->txCredits - fifo->count));
1087
1088         dbg("%s(%d) of %d byte(s) Fifo room  %d -- will copy %d bytes", __FUNCTION__,
1089             port->number, count, edge_port->txCredits - fifo->count, copySize);
1090
1091         /* catch writes of 0 bytes which the tty driver likes to give us, and when txCredits is empty */
1092         if (copySize == 0) {
1093                 dbg("%s - copySize = Zero", __FUNCTION__);
1094                 goto finish_write;
1095         }
1096
1097         // queue the data
1098         // since we can never overflow the buffer we do not have to check for full condition
1099
1100         // the copy is done is two parts -- first fill to the end of the buffer
1101         // then copy the reset from the start of the buffer
1102
1103         bytesleft = fifo->size - fifo->head;
1104         firsthalf = min (bytesleft, copySize);
1105         dbg("%s - copy %d bytes of %d into fifo ", __FUNCTION__, firsthalf, bytesleft);
1106
1107         /* now copy our data */
1108         memcpy(&fifo->fifo[fifo->head], data, firsthalf);
1109         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, firsthalf, &fifo->fifo[fifo->head]);
1110
1111         // update the index and size
1112         fifo->head  += firsthalf;
1113         fifo->count += firsthalf;
1114
1115         // wrap the index
1116         if (fifo->head == fifo->size) {
1117                 fifo->head = 0;
1118         }
1119
1120         secondhalf = copySize-firsthalf;
1121
1122         if (secondhalf) {
1123                 dbg("%s - copy rest of data %d", __FUNCTION__, secondhalf);
1124                 memcpy(&fifo->fifo[fifo->head], &data[firsthalf], secondhalf);
1125                 usb_serial_debug_data(debug, &port->dev, __FUNCTION__, secondhalf, &fifo->fifo[fifo->head]);
1126                 // update the index and size
1127                 fifo->count += secondhalf;
1128                 fifo->head  += secondhalf;
1129                 // No need to check for wrap since we can not get to end of fifo in this part
1130         }
1131
1132 finish_write:
1133         spin_unlock_irqrestore(&edge_port->ep_lock, flags);
1134
1135         send_more_port_data((struct edgeport_serial *)usb_get_serial_data(port->serial), edge_port);
1136
1137         dbg("%s wrote %d byte(s) TxCredits %d, Fifo %d", __FUNCTION__, copySize, edge_port->txCredits, fifo->count);
1138
1139         return copySize;
1140 }
1141
1142
1143 /************************************************************************
1144  *
1145  * send_more_port_data()
1146  *
1147  *      This routine attempts to write additional UART transmit data
1148  *      to a port over the USB bulk pipe. It is called (1) when new
1149  *      data has been written to a port's TxBuffer from higher layers
1150  *      (2) when the peripheral sends us additional TxCredits indicating
1151  *      that it can accept more Tx data for a given port; and (3) when
1152  *      a bulk write completes successfully and we want to see if we
1153  *      can transmit more.
1154  *
1155  ************************************************************************/
1156 static void send_more_port_data(struct edgeport_serial *edge_serial, struct edgeport_port *edge_port)
1157 {
1158         struct TxFifo   *fifo = &edge_port->txfifo;
1159         struct urb      *urb;
1160         unsigned char   *buffer;
1161         int             status;
1162         int             count;
1163         int             bytesleft;
1164         int             firsthalf;
1165         int             secondhalf;
1166         unsigned long   flags;
1167
1168         dbg("%s(%d)", __FUNCTION__, edge_port->port->number);
1169
1170         spin_lock_irqsave(&edge_port->ep_lock, flags);
1171
1172         if (edge_port->write_in_progress ||
1173             !edge_port->open             ||
1174             (fifo->count == 0)) {
1175                 dbg("%s(%d) EXIT - fifo %d, PendingWrite = %d", __FUNCTION__, edge_port->port->number, fifo->count, edge_port->write_in_progress);
1176                 goto exit_send;
1177         }
1178
1179         // since the amount of data in the fifo will always fit into the
1180         // edgeport buffer we do not need to check the write length
1181
1182         //      Do we have enough credits for this port to make it worthwhile
1183         //      to bother queueing a write. If it's too small, say a few bytes,
1184         //      it's better to wait for more credits so we can do a larger
1185         //      write.
1186         if (edge_port->txCredits < EDGE_FW_GET_TX_CREDITS_SEND_THRESHOLD(edge_port->maxTxCredits,EDGE_FW_BULK_MAX_PACKET_SIZE)) {
1187                 dbg("%s(%d) Not enough credit - fifo %d TxCredit %d", __FUNCTION__, edge_port->port->number, fifo->count, edge_port->txCredits );
1188                 goto exit_send;
1189         }
1190
1191         // lock this write
1192         edge_port->write_in_progress = TRUE;
1193
1194         // get a pointer to the write_urb
1195         urb = edge_port->write_urb;
1196
1197         /* make sure transfer buffer is freed */
1198         kfree(urb->transfer_buffer);
1199         urb->transfer_buffer = NULL;
1200
1201         /* build the data header for the buffer and port that we are about to send out */
1202         count = fifo->count;
1203         buffer = kmalloc (count+2, GFP_ATOMIC);
1204         if (buffer == NULL) {
1205                 dev_err(&edge_port->port->dev, "%s - no more kernel memory...\n", __FUNCTION__);
1206                 edge_port->write_in_progress = FALSE;
1207                 goto exit_send;
1208         }
1209         buffer[0] = IOSP_BUILD_DATA_HDR1 (edge_port->port->number - edge_port->port->serial->minor, count);
1210         buffer[1] = IOSP_BUILD_DATA_HDR2 (edge_port->port->number - edge_port->port->serial->minor, count);
1211
1212         /* now copy our data */
1213         bytesleft =  fifo->size - fifo->tail;
1214         firsthalf = min (bytesleft, count);
1215         memcpy(&buffer[2], &fifo->fifo[fifo->tail], firsthalf);
1216         fifo->tail  += firsthalf;
1217         fifo->count -= firsthalf;
1218         if (fifo->tail == fifo->size) {
1219                 fifo->tail = 0;
1220         }
1221
1222         secondhalf = count-firsthalf;
1223         if (secondhalf) {
1224                 memcpy(&buffer[2+firsthalf], &fifo->fifo[fifo->tail], secondhalf);
1225                 fifo->tail  += secondhalf;
1226                 fifo->count -= secondhalf;
1227         }
1228
1229         if (count)
1230                 usb_serial_debug_data(debug, &edge_port->port->dev, __FUNCTION__, count, &buffer[2]);
1231
1232         /* fill up the urb with all of our data and submit it */
1233         usb_fill_bulk_urb (urb, edge_serial->serial->dev,
1234                        usb_sndbulkpipe(edge_serial->serial->dev, edge_serial->bulk_out_endpoint),
1235                        buffer, count+2, edge_bulk_out_data_callback, edge_port);
1236
1237         /* decrement the number of credits we have by the number we just sent */
1238         edge_port->txCredits -= count;
1239         edge_port->icount.tx += count;
1240
1241         urb->dev = edge_serial->serial->dev;
1242         status = usb_submit_urb(urb, GFP_ATOMIC);
1243         if (status) {
1244                 /* something went wrong */
1245                 dev_err(&edge_port->port->dev, "%s - usb_submit_urb(write bulk) failed, status = %d, data lost\n", __FUNCTION__, status);
1246                 edge_port->write_in_progress = FALSE;
1247
1248                 /* revert the credits as something bad happened. */
1249                 edge_port->txCredits += count;
1250                 edge_port->icount.tx -= count;
1251         }
1252         dbg("%s wrote %d byte(s) TxCredit %d, Fifo %d", __FUNCTION__, count, edge_port->txCredits, fifo->count);
1253
1254 exit_send:
1255         spin_unlock_irqrestore(&edge_port->ep_lock, flags);
1256 }
1257
1258
1259 /*****************************************************************************
1260  * edge_write_room
1261  *      this function is called by the tty driver when it wants to know how many
1262  *      bytes of data we can accept for a specific port.
1263  *      If successful, we return the amount of room that we have for this port
1264  *      (the txCredits),
1265  *      Otherwise we return a negative error number.
1266  *****************************************************************************/
1267 static int edge_write_room (struct usb_serial_port *port)
1268 {
1269         struct edgeport_port *edge_port = usb_get_serial_port_data(port);
1270         int room;
1271         unsigned long flags;
1272
1273         dbg("%s", __FUNCTION__);
1274
1275         if (edge_port == NULL)
1276                 return -ENODEV;
1277         if (edge_port->closePending == TRUE)
1278                 return -ENODEV;
1279
1280         dbg("%s - port %d", __FUNCTION__, port->number);
1281
1282         if (!edge_port->open) {
1283                 dbg("%s - port not opened", __FUNCTION__);
1284                 return -EINVAL;
1285         }
1286
1287         // total of both buffers is still txCredit
1288         spin_lock_irqsave(&edge_port->ep_lock, flags);
1289         room = edge_port->txCredits - edge_port->txfifo.count;
1290         spin_unlock_irqrestore(&edge_port->ep_lock, flags);
1291
1292         dbg("%s - returns %d", __FUNCTION__, room);
1293         return room;
1294 }
1295
1296
1297 /*****************************************************************************
1298  * edge_chars_in_buffer
1299  *      this function is called by the tty driver when it wants to know how many
1300  *      bytes of data we currently have outstanding in the port (data that has
1301  *      been written, but hasn't made it out the port yet)
1302  *      If successful, we return the number of bytes left to be written in the
1303  *      system,
1304  *      Otherwise we return a negative error number.
1305  *****************************************************************************/
1306 static int edge_chars_in_buffer (struct usb_serial_port *port)
1307 {
1308         struct edgeport_port *edge_port = usb_get_serial_port_data(port);
1309         int num_chars;
1310         unsigned long flags;
1311
1312         dbg("%s", __FUNCTION__);
1313
1314         if (edge_port == NULL)
1315                 return -ENODEV;
1316         if (edge_port->closePending == TRUE)
1317                 return -ENODEV;
1318
1319         if (!edge_port->open) {
1320                 dbg("%s - port not opened", __FUNCTION__);
1321                 return -EINVAL;
1322         }
1323
1324         spin_lock_irqsave(&edge_port->ep_lock, flags);
1325         num_chars = edge_port->maxTxCredits - edge_port->txCredits + edge_port->txfifo.count;
1326         spin_unlock_irqrestore(&edge_port->ep_lock, flags);
1327         if (num_chars) {
1328                 dbg("%s(port %d) - returns %d", __FUNCTION__, port->number, num_chars);
1329         }
1330
1331         return num_chars;
1332 }
1333
1334
1335 /*****************************************************************************
1336  * SerialThrottle
1337  *      this function is called by the tty driver when it wants to stop the data
1338  *      being read from the port.
1339  *****************************************************************************/
1340 static void edge_throttle (struct usb_serial_port *port)
1341 {
1342         struct edgeport_port *edge_port = usb_get_serial_port_data(port);
1343         struct tty_struct *tty;
1344         int status;
1345
1346         dbg("%s - port %d", __FUNCTION__, port->number);
1347
1348         if (edge_port == NULL)
1349                 return;
1350
1351         if (!edge_port->open) {
1352                 dbg("%s - port not opened", __FUNCTION__);
1353                 return;
1354         }
1355
1356         tty = port->tty;
1357         if (!tty) {
1358                 dbg ("%s - no tty available", __FUNCTION__);
1359                 return;
1360         }
1361
1362         /* if we are implementing XON/XOFF, send the stop character */
1363         if (I_IXOFF(tty)) {
1364                 unsigned char stop_char = STOP_CHAR(tty);
1365                 status = edge_write (port, &stop_char, 1);
1366                 if (status <= 0) {
1367                         return;
1368                 }
1369         }
1370
1371         /* if we are implementing RTS/CTS, toggle that line */
1372         if (tty->termios->c_cflag & CRTSCTS) {
1373                 edge_port->shadowMCR &= ~MCR_RTS;
1374                 status = send_cmd_write_uart_register(edge_port, MCR, edge_port->shadowMCR);
1375                 if (status != 0) {
1376                         return;
1377                 }
1378         }
1379
1380         return;
1381 }
1382
1383
1384 /*****************************************************************************
1385  * edge_unthrottle
1386  *      this function is called by the tty driver when it wants to resume the data
1387  *      being read from the port (called after SerialThrottle is called)
1388  *****************************************************************************/
1389 static void edge_unthrottle (struct usb_serial_port *port)
1390 {
1391         struct edgeport_port *edge_port = usb_get_serial_port_data(port);
1392         struct tty_struct *tty;
1393         int status;
1394
1395         dbg("%s - port %d", __FUNCTION__, port->number);
1396
1397         if (edge_port == NULL)
1398                 return;
1399
1400         if (!edge_port->open) {
1401                 dbg("%s - port not opened", __FUNCTION__);
1402                 return;
1403         }
1404
1405         tty = port->tty;
1406         if (!tty) {
1407                 dbg ("%s - no tty available", __FUNCTION__);
1408                 return;
1409         }
1410
1411         /* if we are implementing XON/XOFF, send the start character */
1412         if (I_IXOFF(tty)) {
1413                 unsigned char start_char = START_CHAR(tty);
1414                 status = edge_write (port, &start_char, 1);
1415                 if (status <= 0) {
1416                         return;
1417                 }
1418         }
1419
1420         /* if we are implementing RTS/CTS, toggle that line */
1421         if (tty->termios->c_cflag & CRTSCTS) {
1422                 edge_port->shadowMCR |= MCR_RTS;
1423                 status = send_cmd_write_uart_register(edge_port, MCR, edge_port->shadowMCR);
1424                 if (status != 0) {
1425                         return;
1426                 }
1427         }
1428
1429         return;
1430 }
1431
1432
1433 /*****************************************************************************
1434  * SerialSetTermios
1435  *      this function is called by the tty driver when it wants to change the termios structure
1436  *****************************************************************************/
1437 static void edge_set_termios (struct usb_serial_port *port, struct termios *old_termios)
1438 {
1439         struct edgeport_port *edge_port = usb_get_serial_port_data(port);
1440         struct tty_struct *tty = port->tty;
1441         unsigned int cflag;
1442
1443         if (!port->tty || !port->tty->termios) {
1444                 dbg ("%s - no tty or termios", __FUNCTION__);
1445                 return;
1446         }
1447
1448         cflag = tty->termios->c_cflag;
1449         /* check that they really want us to change something */
1450         if (old_termios) {
1451                 if (cflag == old_termios->c_cflag &&
1452                     tty->termios->c_iflag == old_termios->c_iflag) {
1453                         dbg("%s - nothing to change", __FUNCTION__);
1454                         return;
1455                 }
1456         }
1457
1458         dbg("%s - clfag %08x iflag %08x", __FUNCTION__,
1459             tty->termios->c_cflag, tty->termios->c_iflag);
1460         if (old_termios) {
1461                 dbg("%s - old clfag %08x old iflag %08x", __FUNCTION__,
1462                     old_termios->c_cflag, old_termios->c_iflag);
1463         }
1464
1465         dbg("%s - port %d", __FUNCTION__, port->number);
1466
1467         if (edge_port == NULL)
1468                 return;
1469
1470         if (!edge_port->open) {
1471                 dbg("%s - port not opened", __FUNCTION__);
1472                 return;
1473         }
1474
1475         /* change the port settings to the new ones specified */
1476         change_port_settings (edge_port, old_termios);
1477
1478         return;
1479 }
1480
1481
1482 /*****************************************************************************
1483  * get_lsr_info - get line status register info
1484  *
1485  * Purpose: Let user call ioctl() to get info when the UART physically
1486  *          is emptied.  On bus types like RS485, the transmitter must
1487  *          release the bus after transmitting. This must be done when
1488  *          the transmit shift register is empty, not be done when the
1489  *          transmit holding register is empty.  This functionality
1490  *          allows an RS485 driver to be written in user space.
1491  *****************************************************************************/
1492 static int get_lsr_info(struct edgeport_port *edge_port, unsigned int __user *value)
1493 {
1494         unsigned int result = 0;
1495         unsigned long flags;
1496
1497         spin_lock_irqsave(&edge_port->ep_lock, flags);
1498         if (edge_port->maxTxCredits == edge_port->txCredits &&
1499             edge_port->txfifo.count == 0) {
1500                 dbg("%s -- Empty", __FUNCTION__);
1501                 result = TIOCSER_TEMT;
1502         }
1503         spin_unlock_irqrestore(&edge_port->ep_lock, flags);
1504
1505         if (copy_to_user(value, &result, sizeof(int)))
1506                 return -EFAULT;
1507         return 0;
1508 }
1509
1510 static int get_number_bytes_avail(struct edgeport_port *edge_port, unsigned int __user *value)
1511 {
1512         unsigned int result = 0;
1513         struct tty_struct *tty = edge_port->port->tty;
1514
1515         if (!tty)
1516                 return -ENOIOCTLCMD;
1517
1518         result = tty->read_cnt;
1519
1520         dbg("%s(%d) = %d", __FUNCTION__,  edge_port->port->number, result);
1521         if (copy_to_user(value, &result, sizeof(int)))
1522                 return -EFAULT;
1523         //return 0;
1524         return -ENOIOCTLCMD;
1525 }
1526
1527 static int edge_tiocmset (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear)
1528 {
1529         struct edgeport_port *edge_port = usb_get_serial_port_data(port);
1530         unsigned int mcr;
1531
1532         dbg("%s - port %d", __FUNCTION__, port->number);
1533
1534         mcr = edge_port->shadowMCR;
1535         if (set & TIOCM_RTS)
1536                 mcr |= MCR_RTS;
1537         if (set & TIOCM_DTR)
1538                 mcr |= MCR_DTR;
1539         if (set & TIOCM_LOOP)
1540                 mcr |= MCR_LOOPBACK;
1541
1542         if (clear & TIOCM_RTS)
1543                 mcr &= ~MCR_RTS;
1544         if (clear & TIOCM_DTR)
1545                 mcr &= ~MCR_DTR;
1546         if (clear & TIOCM_LOOP)
1547                 mcr &= ~MCR_LOOPBACK;
1548
1549         edge_port->shadowMCR = mcr;
1550
1551         send_cmd_write_uart_register(edge_port, MCR, edge_port->shadowMCR);
1552
1553         return 0;
1554 }
1555
1556 static int edge_tiocmget(struct usb_serial_port *port, struct file *file)
1557 {
1558         struct edgeport_port *edge_port = usb_get_serial_port_data(port);
1559         unsigned int result = 0;
1560         unsigned int msr;
1561         unsigned int mcr;
1562
1563         dbg("%s - port %d", __FUNCTION__, port->number);
1564
1565         msr = edge_port->shadowMSR;
1566         mcr = edge_port->shadowMCR;
1567         result = ((mcr & MCR_DTR)       ? TIOCM_DTR: 0)   /* 0x002 */
1568                   | ((mcr & MCR_RTS)    ? TIOCM_RTS: 0)   /* 0x004 */
1569                   | ((msr & EDGEPORT_MSR_CTS)   ? TIOCM_CTS: 0)   /* 0x020 */
1570                   | ((msr & EDGEPORT_MSR_CD)    ? TIOCM_CAR: 0)   /* 0x040 */
1571                   | ((msr & EDGEPORT_MSR_RI)    ? TIOCM_RI:  0)   /* 0x080 */
1572                   | ((msr & EDGEPORT_MSR_DSR)   ? TIOCM_DSR: 0);  /* 0x100 */
1573
1574
1575         dbg("%s -- %x", __FUNCTION__, result);
1576
1577         return result;
1578 }
1579
1580 static int get_serial_info(struct edgeport_port *edge_port, struct serial_struct __user *retinfo)
1581 {
1582         struct serial_struct tmp;
1583
1584         if (!retinfo)
1585                 return -EFAULT;
1586
1587         memset(&tmp, 0, sizeof(tmp));
1588
1589         tmp.type                = PORT_16550A;
1590         tmp.line                = edge_port->port->serial->minor;
1591         tmp.port                = edge_port->port->number;
1592         tmp.irq                 = 0;
1593         tmp.flags               = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1594         tmp.xmit_fifo_size      = edge_port->maxTxCredits;
1595         tmp.baud_base           = 9600;
1596         tmp.close_delay         = 5*HZ;
1597         tmp.closing_wait        = 30*HZ;
1598 //      tmp.custom_divisor      = state->custom_divisor;
1599 //      tmp.hub6                = state->hub6;
1600 //      tmp.io_type             = state->io_type;
1601
1602         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1603                 return -EFAULT;
1604         return 0;
1605 }
1606
1607
1608
1609 /*****************************************************************************
1610  * SerialIoctl
1611  *      this function handles any ioctl calls to the driver
1612  *****************************************************************************/
1613 static int edge_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
1614 {
1615         DEFINE_WAIT(wait);
1616         struct edgeport_port *edge_port = usb_get_serial_port_data(port);
1617         struct async_icount cnow;
1618         struct async_icount cprev;
1619         struct serial_icounter_struct icount;
1620
1621         dbg("%s - port %d, cmd = 0x%x", __FUNCTION__, port->number, cmd);
1622
1623         switch (cmd) {
1624                 // return number of bytes available
1625                 case TIOCINQ:
1626                         dbg("%s (%d) TIOCINQ", __FUNCTION__,  port->number);
1627                         return get_number_bytes_avail(edge_port, (unsigned int __user *) arg);
1628                         break;
1629
1630                 case TIOCSERGETLSR:
1631                         dbg("%s (%d) TIOCSERGETLSR", __FUNCTION__,  port->number);
1632                         return get_lsr_info(edge_port, (unsigned int __user *) arg);
1633                         return 0;
1634
1635                 case TIOCGSERIAL:
1636                         dbg("%s (%d) TIOCGSERIAL", __FUNCTION__,  port->number);
1637                         return get_serial_info(edge_port, (struct serial_struct __user *) arg);
1638
1639                 case TIOCSSERIAL:
1640                         dbg("%s (%d) TIOCSSERIAL", __FUNCTION__,  port->number);
1641                         break;
1642
1643                 case TIOCMIWAIT:
1644                         dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
1645                         cprev = edge_port->icount;
1646                         while (1) {
1647                                 prepare_to_wait(&edge_port->delta_msr_wait, &wait, TASK_INTERRUPTIBLE);
1648                                 schedule();
1649                                 finish_wait(&edge_port->delta_msr_wait, &wait);
1650                                 /* see if a signal did it */
1651                                 if (signal_pending(current))
1652                                         return -ERESTARTSYS;
1653                                 cnow = edge_port->icount;
1654                                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1655                                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1656                                         return -EIO; /* no change => error */
1657                                 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1658                                     ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1659                                     ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1660                                     ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1661                                         return 0;
1662                                 }
1663                                 cprev = cnow;
1664                         }
1665                         /* NOTREACHED */
1666                         break;
1667
1668                 case TIOCGICOUNT:
1669                         cnow = edge_port->icount;
1670                         memset(&icount, 0, sizeof(icount));
1671                         icount.cts = cnow.cts;
1672                         icount.dsr = cnow.dsr;
1673                         icount.rng = cnow.rng;
1674                         icount.dcd = cnow.dcd;
1675                         icount.rx = cnow.rx;
1676                         icount.tx = cnow.tx;
1677                         icount.frame = cnow.frame;
1678                         icount.overrun = cnow.overrun;
1679                         icount.parity = cnow.parity;
1680                         icount.brk = cnow.brk;
1681                         icount.buf_overrun = cnow.buf_overrun;
1682
1683                         dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__,  port->number, icount.rx, icount.tx );
1684                         if (copy_to_user((void __user *)arg, &icount, sizeof(icount)))
1685                                 return -EFAULT;
1686                         return 0;
1687         }
1688
1689         return -ENOIOCTLCMD;
1690 }
1691
1692
1693 /*****************************************************************************
1694  * SerialBreak
1695  *      this function sends a break to the port
1696  *****************************************************************************/
1697 static void edge_break (struct usb_serial_port *port, int break_state)
1698 {
1699         struct edgeport_port *edge_port = usb_get_serial_port_data(port);
1700         int status;
1701
1702         /* flush and chase */
1703         edge_port->chaseResponsePending = TRUE;
1704
1705         dbg("%s - Sending IOSP_CMD_CHASE_PORT", __FUNCTION__);
1706         status = send_iosp_ext_cmd (edge_port, IOSP_CMD_CHASE_PORT, 0);
1707         if (status == 0) {
1708                 // block until chase finished
1709                 block_until_chase_response(edge_port);
1710         } else {
1711                 edge_port->chaseResponsePending = FALSE;
1712         }
1713
1714         if (break_state == -1) {
1715                 dbg("%s - Sending IOSP_CMD_SET_BREAK", __FUNCTION__);
1716                 status = send_iosp_ext_cmd (edge_port, IOSP_CMD_SET_BREAK, 0);
1717         } else {
1718                 dbg("%s - Sending IOSP_CMD_CLEAR_BREAK", __FUNCTION__);
1719                 status = send_iosp_ext_cmd (edge_port, IOSP_CMD_CLEAR_BREAK, 0);
1720         }
1721         if (status) {
1722                 dbg("%s - error sending break set/clear command.", __FUNCTION__);
1723         }
1724
1725         return;
1726 }
1727
1728
1729 /*****************************************************************************
1730  * process_rcvd_data
1731  *      this function handles the data received on the bulk in pipe.
1732  *****************************************************************************/
1733 static void process_rcvd_data (struct edgeport_serial *edge_serial, unsigned char * buffer, __u16 bufferLength)
1734 {
1735         struct usb_serial_port *port;
1736         struct edgeport_port *edge_port;
1737         struct tty_struct *tty;
1738         __u16 lastBufferLength;
1739         __u16 rxLen;
1740
1741         dbg("%s", __FUNCTION__);
1742
1743         lastBufferLength = bufferLength + 1;
1744
1745         while (bufferLength > 0) {
1746                 /* failsafe incase we get a message that we don't understand */
1747                 if (lastBufferLength == bufferLength) {
1748                         dbg("%s - stuck in loop, exiting it.", __FUNCTION__);
1749                         break;
1750                 }
1751                 lastBufferLength = bufferLength;
1752
1753                 switch (edge_serial->rxState) {
1754                         case EXPECT_HDR1:
1755                                 edge_serial->rxHeader1 = *buffer;
1756                                 ++buffer;
1757                                 --bufferLength;
1758
1759                                 if (bufferLength == 0) {
1760                                         edge_serial->rxState = EXPECT_HDR2;
1761                                         break;
1762                                 }
1763                                 /* otherwise, drop on through */
1764
1765                         case EXPECT_HDR2:
1766                                 edge_serial->rxHeader2 = *buffer;
1767                                 ++buffer;
1768                                 --bufferLength;
1769
1770                                 dbg("%s - Hdr1=%02X Hdr2=%02X", __FUNCTION__, edge_serial->rxHeader1, edge_serial->rxHeader2);
1771
1772                                 // Process depending on whether this header is
1773                                 // data or status
1774
1775                                 if (IS_CMD_STAT_HDR(edge_serial->rxHeader1)) {
1776                                         // Decode this status header and goto EXPECT_HDR1 (if we
1777                                         // can process the status with only 2 bytes), or goto
1778                                         // EXPECT_HDR3 to get the third byte.
1779
1780                                         edge_serial->rxPort       = IOSP_GET_HDR_PORT(edge_serial->rxHeader1);
1781                                         edge_serial->rxStatusCode = IOSP_GET_STATUS_CODE(edge_serial->rxHeader1);
1782
1783                                         if (!IOSP_STATUS_IS_2BYTE(edge_serial->rxStatusCode)) {
1784                                                 // This status needs additional bytes. Save what we have
1785                                                 // and then wait for more data.
1786                                                 edge_serial->rxStatusParam = edge_serial->rxHeader2;
1787
1788                                                 edge_serial->rxState = EXPECT_HDR3;
1789                                                 break;
1790                                         }
1791
1792                                         // We have all the header bytes, process the status now
1793                                         process_rcvd_status (edge_serial, edge_serial->rxHeader2, 0);
1794                                         edge_serial->rxState = EXPECT_HDR1;
1795                                         break;
1796                                 } else {
1797                                         edge_serial->rxPort = IOSP_GET_HDR_PORT(edge_serial->rxHeader1);
1798                                         edge_serial->rxBytesRemaining = IOSP_GET_HDR_DATA_LEN(edge_serial->rxHeader1, edge_serial->rxHeader2);
1799
1800                                         dbg("%s - Data for Port %u Len %u", __FUNCTION__, edge_serial->rxPort, edge_serial->rxBytesRemaining);
1801
1802                                         //ASSERT( DevExt->RxPort < DevExt->NumPorts );
1803                                         //ASSERT( DevExt->RxBytesRemaining < IOSP_MAX_DATA_LENGTH );
1804
1805                                         if (bufferLength == 0 ) {
1806                                                 edge_serial->rxState = EXPECT_DATA;
1807                                                 break;
1808                                         }
1809                                         // Else, drop through
1810                                 }
1811
1812                         case EXPECT_DATA:       // Expect data
1813
1814                                 if (bufferLength < edge_serial->rxBytesRemaining) {
1815                                         rxLen = bufferLength;
1816                                         edge_serial->rxState = EXPECT_DATA;     // Expect data to start next buffer
1817                                 } else {
1818                                         // BufLen >= RxBytesRemaining
1819                                         rxLen = edge_serial->rxBytesRemaining;
1820                                         edge_serial->rxState = EXPECT_HDR1;     // Start another header next time
1821                                 }
1822
1823                                 bufferLength -= rxLen;
1824                                 edge_serial->rxBytesRemaining -= rxLen;
1825
1826                                 /* spit this data back into the tty driver if this port is open */
1827                                 if (rxLen) {
1828                                         port = edge_serial->serial->port[edge_serial->rxPort];
1829                                         edge_port = usb_get_serial_port_data(port);
1830                                         if (edge_port->open) {
1831                                                 tty = edge_port->port->tty;
1832                                                 if (tty) {
1833                                                         dbg("%s - Sending %d bytes to TTY for port %d", __FUNCTION__, rxLen, edge_serial->rxPort);
1834                                                         edge_tty_recv(&edge_serial->serial->dev->dev, tty, buffer, rxLen);
1835                                                 }
1836                                                 edge_port->icount.rx += rxLen;
1837                                         }
1838                                         buffer += rxLen;
1839                                 }
1840
1841                                 break;
1842
1843                         case EXPECT_HDR3:                       // Expect 3rd byte of status header
1844                                 edge_serial->rxHeader3 = *buffer;
1845                                 ++buffer;
1846                                 --bufferLength;
1847
1848                                 // We have all the header bytes, process the status now
1849                                 process_rcvd_status (edge_serial, edge_serial->rxStatusParam, edge_serial->rxHeader3);
1850                                 edge_serial->rxState = EXPECT_HDR1;
1851                                 break;
1852
1853                 }
1854         }
1855 }
1856
1857
1858 /*****************************************************************************
1859  * process_rcvd_status
1860  *      this function handles the any status messages received on the bulk in pipe.
1861  *****************************************************************************/
1862 static void process_rcvd_status (struct edgeport_serial *edge_serial, __u8 byte2, __u8 byte3)
1863 {
1864         struct usb_serial_port *port;
1865         struct edgeport_port *edge_port;
1866         __u8 code = edge_serial->rxStatusCode;
1867
1868         /* switch the port pointer to the one being currently talked about */
1869         port = edge_serial->serial->port[edge_serial->rxPort];
1870         edge_port = usb_get_serial_port_data(port);
1871         if (edge_port == NULL) {
1872                 dev_err(&edge_serial->serial->dev->dev, "%s - edge_port == NULL for port %d\n", __FUNCTION__, edge_serial->rxPort);
1873                 return;
1874         }
1875
1876         dbg("%s - port %d", __FUNCTION__, edge_serial->rxPort);
1877
1878         if (code == IOSP_EXT_STATUS) {
1879                 switch (byte2) {
1880                         case IOSP_EXT_STATUS_CHASE_RSP:
1881                                 // we want to do EXT status regardless of port open/closed
1882                                 dbg("%s - Port %u EXT CHASE_RSP Data = %02x", __FUNCTION__, edge_serial->rxPort, byte3 );
1883                                 // Currently, the only EXT_STATUS is Chase, so process here instead of one more call
1884                                 // to one more subroutine. If/when more EXT_STATUS, there'll be more work to do.
1885                                 // Also, we currently clear flag and close the port regardless of content of above's Byte3.
1886                                 // We could choose to do something else when Byte3 says Timeout on Chase from Edgeport,
1887                                 // like wait longer in block_until_chase_response, but for now we don't.
1888                                 edge_port->chaseResponsePending = FALSE;
1889                                 wake_up (&edge_port->wait_chase);
1890                                 return;
1891
1892                         case IOSP_EXT_STATUS_RX_CHECK_RSP:
1893                                 dbg("%s ========== Port %u CHECK_RSP Sequence = %02x =============\n", __FUNCTION__, edge_serial->rxPort, byte3 );
1894                                 //Port->RxCheckRsp = TRUE;
1895                                 return;
1896                 }
1897         }
1898
1899         if (code == IOSP_STATUS_OPEN_RSP) {
1900                 edge_port->txCredits = GET_TX_BUFFER_SIZE(byte3);
1901                 edge_port->maxTxCredits = edge_port->txCredits;
1902                 dbg("%s - Port %u Open Response Inital MSR = %02x TxBufferSize = %d", __FUNCTION__, edge_serial->rxPort, byte2, edge_port->txCredits);
1903                 handle_new_msr (edge_port, byte2);
1904
1905                 /* send the current line settings to the port so we are in sync with any further termios calls */
1906                 if (edge_port->port->tty)
1907                         change_port_settings (edge_port, edge_port->port->tty->termios);
1908
1909                 /* we have completed the open */
1910                 edge_port->openPending = FALSE;
1911                 edge_port->open = TRUE;
1912                 wake_up(&edge_port->wait_open);
1913                 return;
1914         }
1915
1916         // If port is closed, silently discard all rcvd status. We can
1917         // have cases where buffered status is received AFTER the close
1918         // port command is sent to the Edgeport.
1919         if ((!edge_port->open ) || (edge_port->closePending)) {
1920                 return;
1921         }
1922
1923         switch (code) {
1924                 // Not currently sent by Edgeport
1925                 case IOSP_STATUS_LSR:
1926                         dbg("%s - Port %u LSR Status = %02x", __FUNCTION__, edge_serial->rxPort, byte2);
1927                         handle_new_lsr (edge_port, FALSE, byte2, 0);
1928                         break;
1929
1930                 case IOSP_STATUS_LSR_DATA:
1931                         dbg("%s - Port %u LSR Status = %02x, Data = %02x", __FUNCTION__, edge_serial->rxPort, byte2, byte3);
1932                         // byte2 is LSR Register
1933                         // byte3 is broken data byte
1934                         handle_new_lsr (edge_port, TRUE, byte2, byte3);
1935                         break;
1936                         //
1937                         //      case IOSP_EXT_4_STATUS:
1938                         //              dbg("%s - Port %u LSR Status = %02x Data = %02x", __FUNCTION__, edge_serial->rxPort, byte2, byte3);
1939                         //              break;
1940                         //
1941                 case IOSP_STATUS_MSR:
1942                         dbg("%s - Port %u MSR Status = %02x", __FUNCTION__, edge_serial->rxPort, byte2);
1943
1944                         // Process this new modem status and generate appropriate
1945                         // events, etc, based on the new status. This routine
1946                         // also saves the MSR in Port->ShadowMsr.
1947                         handle_new_msr(edge_port, byte2);
1948                         break;
1949
1950                 default:
1951                         dbg("%s - Unrecognized IOSP status code %u\n", __FUNCTION__, code);
1952                         break;
1953         }
1954
1955         return;
1956 }
1957
1958
1959 /*****************************************************************************
1960  * edge_tty_recv
1961  *      this function passes data on to the tty flip buffer
1962  *****************************************************************************/
1963 static void edge_tty_recv(struct device *dev, struct tty_struct *tty, unsigned char *data, int length)
1964 {
1965         int cnt;
1966
1967         do {
1968                 cnt = tty_buffer_request_room(tty, length);
1969                 if (cnt < length) {
1970                         dev_err(dev, "%s - dropping data, %d bytes lost\n",
1971                                         __FUNCTION__, length - cnt);
1972                         if(cnt == 0)
1973                                 break;
1974                 }
1975                 tty_insert_flip_string(tty, data, cnt);
1976                 data += cnt;
1977                 length -= cnt;
1978         } while (length > 0);
1979
1980         tty_flip_buffer_push(tty);
1981 }
1982
1983
1984 /*****************************************************************************
1985  * handle_new_msr
1986  *      this function handles any change to the msr register for a port.
1987  *****************************************************************************/
1988 static void handle_new_msr(struct edgeport_port *edge_port, __u8 newMsr)
1989 {
1990         struct  async_icount *icount;
1991
1992         dbg("%s %02x", __FUNCTION__, newMsr);
1993
1994         if (newMsr & (EDGEPORT_MSR_DELTA_CTS | EDGEPORT_MSR_DELTA_DSR | EDGEPORT_MSR_DELTA_RI | EDGEPORT_MSR_DELTA_CD)) {
1995                 icount = &edge_port->icount;
1996
1997                 /* update input line counters */
1998                 if (newMsr & EDGEPORT_MSR_DELTA_CTS) {
1999                         icount->cts++;
2000                 }
2001                 if (newMsr & EDGEPORT_MSR_DELTA_DSR) {
2002                         icount->dsr++;
2003                 }
2004                 if (newMsr & EDGEPORT_MSR_DELTA_CD) {
2005                         icount->dcd++;
2006                 }
2007                 if (newMsr & EDGEPORT_MSR_DELTA_RI) {
2008                         icount->rng++;
2009                 }
2010                 wake_up_interruptible(&edge_port->delta_msr_wait);
2011         }
2012
2013         /* Save the new modem status */
2014         edge_port->shadowMSR = newMsr & 0xf0;
2015
2016         return;
2017 }
2018
2019
2020 /*****************************************************************************
2021  * handle_new_lsr
2022  *      this function handles any change to the lsr register for a port.
2023  *****************************************************************************/
2024 static void handle_new_lsr(struct edgeport_port *edge_port, __u8 lsrData, __u8 lsr, __u8 data)
2025 {
2026         __u8    newLsr = (__u8)(lsr & (__u8)(LSR_OVER_ERR | LSR_PAR_ERR | LSR_FRM_ERR | LSR_BREAK));
2027         struct  async_icount *icount;
2028
2029         dbg("%s - %02x", __FUNCTION__, newLsr);
2030
2031         edge_port->shadowLSR = lsr;
2032
2033         if (newLsr & LSR_BREAK) {
2034                 //
2035                 // Parity and Framing errors only count if they
2036                 // occur exclusive of a break being
2037                 // received.
2038                 //
2039                 newLsr &= (__u8)(LSR_OVER_ERR | LSR_BREAK);
2040         }
2041
2042         /* Place LSR data byte into Rx buffer */
2043         if (lsrData && edge_port->port->tty)
2044                 edge_tty_recv(&edge_port->port->dev, edge_port->port->tty, &data, 1);
2045
2046         /* update input line counters */
2047         icount = &edge_port->icount;
2048         if (newLsr & LSR_BREAK) {
2049                 icount->brk++;
2050         }
2051         if (newLsr & LSR_OVER_ERR) {
2052                 icount->overrun++;
2053         }
2054         if (newLsr & LSR_PAR_ERR) {
2055                 icount->parity++;
2056         }
2057         if (newLsr & LSR_FRM_ERR) {
2058                 icount->frame++;
2059         }
2060
2061         return;
2062 }
2063
2064
2065 /****************************************************************************
2066  * sram_write
2067  *      writes a number of bytes to the Edgeport device's sram starting at the
2068  *      given address.
2069  *      If successful returns the number of bytes written, otherwise it returns
2070  *      a negative error number of the problem.
2071  ****************************************************************************/
2072 static int sram_write (struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data)
2073 {
2074         int result;
2075         __u16 current_length;
2076         unsigned char *transfer_buffer;
2077
2078         dbg("%s - %x, %x, %d", __FUNCTION__, extAddr, addr, length);
2079
2080         transfer_buffer =  kmalloc (64, GFP_KERNEL);
2081         if (!transfer_buffer) {
2082                 dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, 64);
2083                 return -ENOMEM;
2084         }
2085
2086         /* need to split these writes up into 64 byte chunks */
2087         result = 0;
2088         while (length > 0) {
2089                 if (length > 64) {
2090                         current_length = 64;
2091                 } else {
2092                         current_length = length;
2093                 }
2094 //              dbg("%s - writing %x, %x, %d", __FUNCTION__, extAddr, addr, current_length);
2095                 memcpy (transfer_buffer, data, current_length);
2096                 result = usb_control_msg (serial->dev, usb_sndctrlpipe(serial->dev, 0), USB_REQUEST_ION_WRITE_RAM,
2097                                           0x40, addr, extAddr, transfer_buffer, current_length, 300);
2098                 if (result < 0)
2099                         break;
2100                 length -= current_length;
2101                 addr += current_length;
2102                 data += current_length;
2103         }
2104
2105         kfree (transfer_buffer);
2106         return result;
2107 }
2108
2109
2110 /****************************************************************************
2111  * rom_write
2112  *      writes a number of bytes to the Edgeport device's ROM starting at the
2113  *      given address.
2114  *      If successful returns the number of bytes written, otherwise it returns
2115  *      a negative error number of the problem.
2116  ****************************************************************************/
2117 static int rom_write (struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data)
2118 {
2119         int result;
2120         __u16 current_length;
2121         unsigned char *transfer_buffer;
2122
2123 //      dbg("%s - %x, %x, %d", __FUNCTION__, extAddr, addr, length);
2124
2125         transfer_buffer =  kmalloc (64, GFP_KERNEL);
2126         if (!transfer_buffer) {
2127                 dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, 64);
2128                 return -ENOMEM;
2129         }
2130
2131         /* need to split these writes up into 64 byte chunks */
2132         result = 0;
2133         while (length > 0) {
2134                 if (length > 64) {
2135                         current_length = 64;
2136                 } else {
2137                         current_length = length;
2138                 }
2139 //              dbg("%s - writing %x, %x, %d", __FUNCTION__, extAddr, addr, current_length);
2140                 memcpy (transfer_buffer, data, current_length);
2141                 result = usb_control_msg (serial->dev, usb_sndctrlpipe(serial->dev, 0), USB_REQUEST_ION_WRITE_ROM,
2142                                           0x40, addr, extAddr, transfer_buffer, current_length, 300);
2143                 if (result < 0)
2144                         break;
2145                 length -= current_length;
2146                 addr += current_length;
2147                 data += current_length;
2148         }
2149
2150         kfree (transfer_buffer);
2151         return result;
2152 }
2153
2154
2155 /****************************************************************************
2156  * rom_read
2157  *      reads a number of bytes from the Edgeport device starting at the given
2158  *      address.
2159  *      If successful returns the number of bytes read, otherwise it returns
2160  *      a negative error number of the problem.
2161  ****************************************************************************/
2162 static int rom_read (struct usb_serial *serial, __u16 extAddr, __u16 addr, __u16 length, __u8 *data)
2163 {
2164         int result;
2165         __u16 current_length;
2166         unsigned char *transfer_buffer;
2167
2168         dbg("%s - %x, %x, %d", __FUNCTION__, extAddr, addr, length);
2169
2170         transfer_buffer =  kmalloc (64, GFP_KERNEL);
2171         if (!transfer_buffer) {
2172                 dev_err(&serial->dev->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, 64);
2173                 return -ENOMEM;
2174         }
2175
2176         /* need to split these reads up into 64 byte chunks */
2177         result = 0;
2178         while (length > 0) {
2179                 if (length > 64) {
2180                         current_length = 64;
2181                 } else {
2182                         current_length = length;
2183                 }
2184 //              dbg("%s - %x, %x, %d", __FUNCTION__, extAddr, addr, current_length);
2185                 result = usb_control_msg (serial->dev, usb_rcvctrlpipe(serial->dev, 0), USB_REQUEST_ION_READ_ROM,
2186                                           0xC0, addr, extAddr, transfer_buffer, current_length, 300);
2187                 if (result < 0)
2188                         break;
2189                 memcpy (data, transfer_buffer, current_length);
2190                 length -= current_length;
2191                 addr += current_length;
2192                 data += current_length;
2193         }
2194
2195         kfree (transfer_buffer);
2196         return result;
2197 }
2198
2199
2200 /****************************************************************************
2201  * send_iosp_ext_cmd
2202  *      Is used to send a IOSP message to the Edgeport device
2203  ****************************************************************************/
2204 static int send_iosp_ext_cmd (struct edgeport_port *edge_port, __u8 command, __u8 param)
2205 {
2206         unsigned char   *buffer;
2207         unsigned char   *currentCommand;
2208         int             length = 0;
2209         int             status = 0;
2210
2211         dbg("%s - %d, %d", __FUNCTION__, command, param);
2212
2213         buffer =  kmalloc (10, GFP_ATOMIC);
2214         if (!buffer) {
2215                 dev_err(&edge_port->port->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, 10);
2216                 return -ENOMEM;
2217         }
2218
2219         currentCommand = buffer;
2220
2221         MAKE_CMD_EXT_CMD (&currentCommand, &length,
2222                           edge_port->port->number - edge_port->port->serial->minor,
2223                           command, param);
2224
2225         status = write_cmd_usb (edge_port, buffer, length);
2226         if (status) {
2227                 /* something bad happened, let's free up the memory */
2228                 kfree(buffer);
2229         }
2230
2231         return status;
2232 }
2233
2234
2235 /*****************************************************************************
2236  * write_cmd_usb
2237  *      this function writes the given buffer out to the bulk write endpoint.
2238  *****************************************************************************/
2239 static int write_cmd_usb (struct edgeport_port *edge_port, unsigned char *buffer, int length)
2240 {
2241         struct edgeport_serial *edge_serial = usb_get_serial_data(edge_port->port->serial);
2242         int status = 0;
2243         struct urb *urb;
2244         int timeout;
2245
2246         usb_serial_debug_data(debug, &edge_port->port->dev, __FUNCTION__, length, buffer);
2247
2248         /* Allocate our next urb */
2249         urb = usb_alloc_urb (0, GFP_ATOMIC);
2250         if (!urb)
2251                 return -ENOMEM;
2252
2253         CmdUrbs++;
2254         dbg("%s - ALLOCATE URB %p (outstanding %d)", __FUNCTION__, urb, CmdUrbs);
2255
2256         usb_fill_bulk_urb (urb, edge_serial->serial->dev,
2257                        usb_sndbulkpipe(edge_serial->serial->dev, edge_serial->bulk_out_endpoint),
2258                        buffer, length, edge_bulk_out_cmd_callback, edge_port);
2259
2260         edge_port->commandPending = TRUE;
2261         status = usb_submit_urb(urb, GFP_ATOMIC);
2262
2263         if (status) {
2264                 /* something went wrong */
2265                 dev_err(&edge_port->port->dev, "%s - usb_submit_urb(write command) failed, status = %d\n", __FUNCTION__, status);
2266                 usb_kill_urb(urb);
2267                 usb_free_urb(urb);
2268                 CmdUrbs--;
2269                 return status;
2270         }
2271
2272         // wait for command to finish
2273         timeout = COMMAND_TIMEOUT;
2274 #if 0
2275         wait_event (&edge_port->wait_command, (edge_port->commandPending == FALSE));
2276
2277         if (edge_port->commandPending == TRUE) {
2278                 /* command timed out */
2279                 dbg("%s - command timed out", __FUNCTION__);
2280                 status = -EINVAL;
2281         }
2282 #endif
2283         return status;
2284 }
2285
2286
2287 /*****************************************************************************
2288  * send_cmd_write_baud_rate
2289  *      this function sends the proper command to change the baud rate of the
2290  *      specified port.
2291  *****************************************************************************/
2292 static int send_cmd_write_baud_rate (struct edgeport_port *edge_port, int baudRate)
2293 {
2294         unsigned char *cmdBuffer;
2295         unsigned char *currCmd;
2296         int cmdLen = 0;
2297         int divisor;
2298         int status;
2299         unsigned char number = edge_port->port->number - edge_port->port->serial->minor;
2300
2301         dbg("%s - port = %d, baud = %d", __FUNCTION__, edge_port->port->number, baudRate);
2302
2303         status = calc_baud_rate_divisor (baudRate, &divisor);
2304         if (status) {
2305                 dev_err(&edge_port->port->dev, "%s - bad baud rate\n", __FUNCTION__);
2306                 return status;
2307         }
2308
2309         // Alloc memory for the string of commands.
2310         cmdBuffer =  kmalloc (0x100, GFP_ATOMIC);
2311         if (!cmdBuffer) {
2312                 dev_err(&edge_port->port->dev, "%s - kmalloc(%d) failed.\n", __FUNCTION__, 0x100);
2313                 return -ENOMEM;
2314         }
2315         currCmd = cmdBuffer;
2316
2317         // Enable access to divisor latch
2318         MAKE_CMD_WRITE_REG( &currCmd, &cmdLen, number, LCR, LCR_DL_ENABLE );
2319
2320         // Write the divisor itself
2321         MAKE_CMD_WRITE_REG( &currCmd, &cmdLen, number, DLL, LOW8 (divisor) );
2322         MAKE_CMD_WRITE_REG( &currCmd, &cmdLen, number, DLM, HIGH8(divisor) );
2323
2324         // Restore original value to disable access to divisor latch
2325         MAKE_CMD_WRITE_REG( &currCmd, &cmdLen, number, LCR, edge_port->shadowLCR);
2326
2327         status = write_cmd_usb(edge_port, cmdBuffer, cmdLen );
2328         if (status) {
2329                 /* something bad happened, let's free up the memory */
2330                 kfree (cmdBuffer);
2331         }
2332
2333         return status;
2334 }
2335
2336
2337 /*****************************************************************************
2338  * calc_baud_rate_divisor
2339  *      this function calculates the proper baud rate divisor for the specified
2340  *      baud rate.
2341  *****************************************************************************/
2342 static int calc_baud_rate_divisor (int baudrate, int *divisor)
2343 {
2344         int i;
2345         __u16 custom;
2346
2347
2348         dbg("%s - %d", __FUNCTION__, baudrate);
2349
2350         for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
2351                 if ( divisor_table[i].BaudRate == baudrate ) {
2352                         *divisor = divisor_table[i].Divisor;
2353                         return 0;
2354                 }
2355         }
2356
2357         // We have tried all of the standard baud rates
2358         // lets try to calculate the divisor for this baud rate
2359         // Make sure the baud rate is reasonable
2360         if (baudrate > 50 && baudrate < 230400) {
2361                 // get divisor
2362                 custom = (__u16)((230400L + baudrate/2) / baudrate);
2363
2364                 *divisor = custom;
2365
2366                 dbg("%s - Baud %d = %d\n", __FUNCTION__, baudrate, custom);
2367                 return 0;
2368         }
2369
2370         return -1;
2371 }
2372
2373
2374 /*****************************************************************************
2375  * send_cmd_write_uart_register
2376  *      this function builds up a uart register message and sends to to the device.
2377  *****************************************************************************/
2378 static int send_cmd_write_uart_register (struct edgeport_port *edge_port, __u8 regNum, __u8 regValue)
2379 {
2380         unsigned char *cmdBuffer;
2381         unsigned char *currCmd;
2382         unsigned long cmdLen = 0;
2383         int status;
2384
2385         dbg("%s - write to %s register 0x%02x", (regNum == MCR) ? "MCR" : "LCR", __FUNCTION__, regValue);
2386
2387         // Alloc memory for the string of commands.
2388         cmdBuffer = kmalloc (0x10, GFP_ATOMIC);
2389         if (cmdBuffer == NULL ) {
2390                 return -ENOMEM;
2391         }
2392
2393         currCmd = cmdBuffer;
2394
2395         // Build a cmd in the buffer to write the given register
2396         MAKE_CMD_WRITE_REG (&currCmd, &cmdLen,
2397                             edge_port->port->number - edge_port->port->serial->minor,
2398                             regNum, regValue);
2399
2400         status = write_cmd_usb(edge_port, cmdBuffer, cmdLen);
2401         if (status) {
2402                 /* something bad happened, let's free up the memory */
2403                 kfree (cmdBuffer);
2404         }
2405
2406         return status;
2407 }
2408
2409
2410 /*****************************************************************************
2411  * change_port_settings
2412  *      This routine is called to set the UART on the device to match the specified
2413  *      new settings.
2414  *****************************************************************************/
2415 #ifndef CMSPAR
2416 #define CMSPAR 0
2417 #endif
2418 static void change_port_settings (struct edgeport_port *edge_port, struct termios *old_termios)
2419 {
2420         struct tty_struct *tty;
2421         int baud;
2422         unsigned cflag;
2423         __u8 mask = 0xff;
2424         __u8 lData;
2425         __u8 lParity;
2426         __u8 lStop;
2427         __u8 rxFlow;
2428         __u8 txFlow;
2429         int status;
2430
2431         dbg("%s - port %d", __FUNCTION__, edge_port->port->number);
2432
2433         if ((!edge_port->open) &&
2434             (!edge_port->openPending)) {
2435                 dbg("%s - port not opened", __FUNCTION__);
2436                 return;
2437         }
2438
2439         tty = edge_port->port->tty;
2440         if ((!tty) ||
2441             (!tty->termios)) {
2442                 dbg("%s - no tty structures", __FUNCTION__);
2443                 return;
2444         }
2445
2446         cflag = tty->termios->c_cflag;
2447
2448         switch (cflag & CSIZE) {
2449                 case CS5:   lData = LCR_BITS_5; mask = 0x1f;    dbg("%s - data bits = 5", __FUNCTION__);   break;
2450                 case CS6:   lData = LCR_BITS_6; mask = 0x3f;    dbg("%s - data bits = 6", __FUNCTION__);   break;
2451                 case CS7:   lData = LCR_BITS_7; mask = 0x7f;    dbg("%s - data bits = 7", __FUNCTION__);   break;
2452                 default:
2453                 case CS8:   lData = LCR_BITS_8;                 dbg("%s - data bits = 8", __FUNCTION__);   break;
2454         }
2455
2456         lParity = LCR_PAR_NONE;
2457         if (cflag & PARENB) {
2458                 if (cflag & CMSPAR) {
2459                         if (cflag & PARODD) {
2460                                 lParity = LCR_PAR_MARK;
2461                                 dbg("%s - parity = mark", __FUNCTION__);
2462                         } else {
2463                                 lParity = LCR_PAR_SPACE;
2464                                 dbg("%s - parity = space", __FUNCTION__);
2465                         }
2466                 } else if (cflag & PARODD) {
2467                         lParity = LCR_PAR_ODD;
2468                         dbg("%s - parity = odd", __FUNCTION__);
2469                 } else {
2470                         lParity = LCR_PAR_EVEN;
2471                         dbg("%s - parity = even", __FUNCTION__);
2472                 }
2473         } else {
2474                 dbg("%s - parity = none", __FUNCTION__);
2475         }
2476
2477         if (cflag & CSTOPB) {
2478                 lStop = LCR_STOP_2;
2479                 dbg("%s - stop bits = 2", __FUNCTION__);
2480         } else {
2481                 lStop = LCR_STOP_1;
2482                 dbg("%s - stop bits = 1", __FUNCTION__);
2483         }
2484
2485         /* figure out the flow control settings */
2486         rxFlow = txFlow = 0x00;
2487         if (cflag & CRTSCTS) {
2488                 rxFlow |= IOSP_RX_FLOW_RTS;
2489                 txFlow |= IOSP_TX_FLOW_CTS;
2490                 dbg("%s - RTS/CTS is enabled", __FUNCTION__);
2491         } else {
2492                 dbg("%s - RTS/CTS is disabled", __FUNCTION__);
2493         }
2494
2495         /* if we are implementing XON/XOFF, set the start and stop character in the device */
2496         if (I_IXOFF(tty) || I_IXON(tty)) {
2497                 unsigned char stop_char  = STOP_CHAR(tty);
2498                 unsigned char start_char = START_CHAR(tty);
2499
2500                 send_iosp_ext_cmd (edge_port, IOSP_CMD_SET_XON_CHAR, start_char);
2501                 send_iosp_ext_cmd (edge_port, IOSP_CMD_SET_XOFF_CHAR, stop_char);
2502
2503                 /* if we are implementing INBOUND XON/XOFF */
2504                 if (I_IXOFF(tty)) {
2505                         rxFlow |= IOSP_RX_FLOW_XON_XOFF;
2506                         dbg("%s - INBOUND XON/XOFF is enabled, XON = %2x, XOFF = %2x", __FUNCTION__, start_char, stop_char);
2507                 } else {
2508                         dbg("%s - INBOUND XON/XOFF is disabled", __FUNCTION__);
2509                 }
2510
2511                 /* if we are implementing OUTBOUND XON/XOFF */
2512                 if (I_IXON(tty)) {
2513                         txFlow |= IOSP_TX_FLOW_XON_XOFF;
2514                         dbg("%s - OUTBOUND XON/XOFF is enabled, XON = %2x, XOFF = %2x", __FUNCTION__, start_char, stop_char);
2515                 } else {
2516                         dbg("%s - OUTBOUND XON/XOFF is disabled", __FUNCTION__);
2517                 }
2518         }
2519
2520         /* Set flow control to the configured value */
2521         send_iosp_ext_cmd (edge_port, IOSP_CMD_SET_RX_FLOW, rxFlow);
2522         send_iosp_ext_cmd (edge_port, IOSP_CMD_SET_TX_FLOW, txFlow);
2523
2524
2525         edge_port->shadowLCR &= ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2526         edge_port->shadowLCR |= (lData | lParity | lStop);
2527
2528         edge_port->validDataMask = mask;
2529
2530         /* Send the updated LCR value to the EdgePort */
2531         status = send_cmd_write_uart_register(edge_port, LCR, edge_port->shadowLCR);
2532         if (status != 0) {
2533                 return;
2534         }
2535
2536         /* set up the MCR register and send it to the EdgePort */
2537         edge_port->shadowMCR = MCR_MASTER_IE;
2538         if (cflag & CBAUD) {
2539                 edge_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2540         }
2541         status = send_cmd_write_uart_register(edge_port, MCR, edge_port->shadowMCR);
2542         if (status != 0) {
2543                 return;
2544         }
2545
2546         /* Determine divisor based on baud rate */
2547         baud = tty_get_baud_rate(tty);
2548         if (!baud) {
2549                 /* pick a default, any default... */
2550                 baud = 9600;
2551         }
2552
2553         dbg("%s - baud rate = %d", __FUNCTION__, baud);
2554         status = send_cmd_write_baud_rate (edge_port, baud);
2555
2556         return;
2557 }
2558
2559
2560 /****************************************************************************
2561  * unicode_to_ascii
2562  *      Turns a string from Unicode into ASCII.
2563  *      Doesn't do a good job with any characters that are outside the normal
2564  *      ASCII range, but it's only for debugging...
2565  *      NOTE: expects the unicode in LE format
2566  ****************************************************************************/
2567 static void unicode_to_ascii(char *string, int buflen, __le16 *unicode, int unicode_size)
2568 {
2569         int i;
2570
2571         if (buflen <= 0)        /* never happens, but... */
2572                 return;
2573         --buflen;               /* space for nul */
2574
2575         for (i = 0; i < unicode_size; i++) {
2576                 if (i >= buflen)
2577                         break;
2578                 string[i] = (char)(le16_to_cpu(unicode[i]));
2579         }
2580         string[i] = 0x00;
2581 }
2582
2583
2584 /****************************************************************************
2585  * get_manufacturing_desc
2586  *      reads in the manufacturing descriptor and stores it into the serial
2587  *      structure.
2588  ****************************************************************************/
2589 static void get_manufacturing_desc (struct edgeport_serial *edge_serial)
2590 {
2591         int response;
2592
2593         dbg("getting manufacturer descriptor");
2594
2595         response = rom_read (edge_serial->serial, (EDGE_MANUF_DESC_ADDR & 0xffff0000) >> 16,
2596                             (__u16)(EDGE_MANUF_DESC_ADDR & 0x0000ffff), EDGE_MANUF_DESC_LEN,
2597                             (__u8 *)(&edge_serial->manuf_descriptor));
2598
2599         if (response < 1) {
2600                 dev_err(&edge_serial->serial->dev->dev, "error in getting manufacturer descriptor\n");
2601         } else {
2602                 char string[30];
2603                 dbg("**Manufacturer Descriptor");
2604                 dbg("  RomSize:        %dK", edge_serial->manuf_descriptor.RomSize);
2605                 dbg("  RamSize:        %dK", edge_serial->manuf_descriptor.RamSize);
2606                 dbg("  CpuRev:         %d", edge_serial->manuf_descriptor.CpuRev);
2607                 dbg("  BoardRev:       %d", edge_serial->manuf_descriptor.BoardRev);
2608                 dbg("  NumPorts:       %d", edge_serial->manuf_descriptor.NumPorts);
2609                 dbg("  DescDate:       %d/%d/%d", edge_serial->manuf_descriptor.DescDate[0], edge_serial->manuf_descriptor.DescDate[1], edge_serial->manuf_descriptor.DescDate[2]+1900);
2610                 unicode_to_ascii(string, sizeof(string),
2611                     edge_serial->manuf_descriptor.SerialNumber,
2612                     edge_serial->manuf_descriptor.SerNumLength/2);
2613                 dbg("  SerialNumber: %s", string);
2614                 unicode_to_ascii(string, sizeof(string),
2615                     edge_serial->manuf_descriptor.AssemblyNumber,
2616                     edge_serial->manuf_descriptor.AssemblyNumLength/2);
2617                 dbg("  AssemblyNumber: %s", string);
2618                 unicode_to_ascii(string, sizeof(string),
2619                     edge_serial->manuf_descriptor.OemAssyNumber,
2620                     edge_serial->manuf_descriptor.OemAssyNumLength/2);
2621                 dbg("  OemAssyNumber:  %s", string);
2622                 dbg("  UartType:       %d", edge_serial->manuf_descriptor.UartType);
2623                 dbg("  IonPid:         %d", edge_serial->manuf_descriptor.IonPid);
2624                 dbg("  IonConfig:      %d", edge_serial->manuf_descriptor.IonConfig);
2625         }
2626 }
2627
2628
2629 /****************************************************************************
2630  * get_boot_desc
2631  *      reads in the bootloader descriptor and stores it into the serial
2632  *      structure.
2633  ****************************************************************************/
2634 static void get_boot_desc (struct edgeport_serial *edge_serial)
2635 {
2636         int response;
2637
2638         dbg("getting boot descriptor");
2639
2640         response = rom_read (edge_serial->serial, (EDGE_BOOT_DESC_ADDR & 0xffff0000) >> 16,
2641                             (__u16)(EDGE_BOOT_DESC_ADDR & 0x0000ffff), EDGE_BOOT_DESC_LEN,
2642                             (__u8 *)(&edge_serial->boot_descriptor));
2643
2644         if (response < 1) {
2645                 dev_err(&edge_serial->serial->dev->dev, "error in getting boot descriptor\n");
2646         } else {
2647                 dbg("**Boot Descriptor:");
2648                 dbg("  BootCodeLength: %d", le16_to_cpu(edge_serial->boot_descriptor.BootCodeLength));
2649                 dbg("  MajorVersion:   %d", edge_serial->boot_descriptor.MajorVersion);
2650                 dbg("  MinorVersion:   %d", edge_serial->boot_descriptor.MinorVersion);
2651                 dbg("  BuildNumber:    %d", le16_to_cpu(edge_serial->boot_descriptor.BuildNumber));
2652                 dbg("  Capabilities:   0x%x", le16_to_cpu(edge_serial->boot_descriptor.Capabilities));
2653                 dbg("  UConfig0:       %d", edge_serial->boot_descriptor.UConfig0);
2654                 dbg("  UConfig1:       %d", edge_serial->boot_descriptor.UConfig1);
2655         }
2656 }
2657
2658
2659 /****************************************************************************
2660  * load_application_firmware
2661  *      This is called to load the application firmware to the device
2662  ****************************************************************************/
2663 static void load_application_firmware (struct edgeport_serial *edge_serial)
2664 {
2665         struct edge_firmware_image_record *record;
2666         unsigned char *firmware;
2667         unsigned char *FirmwareImage;
2668         int ImageSize;
2669         int response;
2670
2671
2672         switch (edge_serial->product_info.iDownloadFile) {
2673                 case EDGE_DOWNLOAD_FILE_I930:
2674                         dbg("downloading firmware version (930) %d.%d.%d",
2675                             OperationalCodeImageVersion_GEN1.MajorVersion,
2676                             OperationalCodeImageVersion_GEN1.MinorVersion,
2677                             OperationalCodeImageVersion_GEN1.BuildNumber);
2678                         firmware = &OperationalCodeImage_GEN1[0];
2679                         FirmwareImage = &OperationalCodeImage_GEN1[0];
2680                         ImageSize = sizeof(OperationalCodeImage_GEN1);
2681                         break;
2682
2683                 case EDGE_DOWNLOAD_FILE_80251:
2684                         dbg("downloading firmware version (80251) %d.%d.%d",
2685                             OperationalCodeImageVersion_GEN2.MajorVersion,
2686                             OperationalCodeImageVersion_GEN2.MinorVersion,
2687                             OperationalCodeImageVersion_GEN2.BuildNumber);
2688                         firmware = &OperationalCodeImage_GEN2[0];
2689                         FirmwareImage = &OperationalCodeImage_GEN2[0];
2690                         ImageSize = sizeof(OperationalCodeImage_GEN2);
2691                         break;
2692
2693                 case EDGE_DOWNLOAD_FILE_NONE:
2694                         dbg     ("No download file specified, skipping download\n");
2695                         return;
2696
2697                 default:
2698                         return;
2699         }
2700
2701
2702         for (;;) {
2703                 record = (struct edge_firmware_image_record *)firmware;
2704                 response = sram_write (edge_serial->serial, le16_to_cpu(record->ExtAddr), le16_to_cpu(record->Addr), le16_to_cpu(record->Len), &record->Data[0]);
2705                 if (response < 0) {
2706                         dev_err(&edge_serial->serial->dev->dev, "sram_write failed (%x, %x, %d)\n", le16_to_cpu(record->ExtAddr), le16_to_cpu(record->Addr), le16_to_cpu(record->Len));
2707                         break;
2708                 }
2709                 firmware += sizeof (struct edge_firmware_image_record) + le16_to_cpu(record->Len);
2710                 if (firmware >= &FirmwareImage[ImageSize]) {
2711                         break;
2712                 }
2713         }
2714
2715         dbg("sending exec_dl_code");
2716         response = usb_control_msg (edge_serial->serial->dev,
2717                                     usb_sndctrlpipe(edge_serial->serial->dev, 0),
2718                                     USB_REQUEST_ION_EXEC_DL_CODE,
2719                                     0x40, 0x4000, 0x0001, NULL, 0, 3000);
2720
2721         return;
2722 }
2723
2724
2725 /****************************************************************************
2726  * edge_startup
2727  ****************************************************************************/
2728 static int edge_startup (struct usb_serial *serial)
2729 {
2730         struct edgeport_serial *edge_serial;
2731         struct edgeport_port *edge_port;
2732         struct usb_device *dev;
2733         int i, j;
2734
2735         dev = serial->dev;
2736
2737         /* create our private serial structure */
2738         edge_serial = kzalloc(sizeof(struct edgeport_serial), GFP_KERNEL);
2739         if (edge_serial == NULL) {
2740                 dev_err(&serial->dev->dev, "%s - Out of memory\n", __FUNCTION__);
2741                 return -ENOMEM;
2742         }
2743         spin_lock_init(&edge_serial->es_lock);
2744         edge_serial->serial = serial;
2745         usb_set_serial_data(serial, edge_serial);
2746
2747         /* get the name for the device from the device */
2748         i = get_string(dev, dev->descriptor.iManufacturer,
2749             &edge_serial->name[0], MAX_NAME_LEN+1);
2750         edge_serial->name[i++] = ' ';
2751         get_string(dev, dev->descriptor.iProduct,
2752             &edge_serial->name[i], MAX_NAME_LEN+2 - i);
2753
2754         dev_info(&serial->dev->dev, "%s detected\n", edge_serial->name);
2755
2756         /* get the manufacturing descriptor for this device */
2757         get_manufacturing_desc (edge_serial);
2758
2759         /* get the boot descriptor */
2760         get_boot_desc (edge_serial);
2761
2762         get_product_info(edge_serial);
2763
2764         /* set the number of ports from the manufacturing description */
2765         /* serial->num_ports = serial->product_info.NumPorts; */
2766         if (edge_serial->product_info.NumPorts != serial->num_ports) {
2767                 warn("%s - Device Reported %d serial ports vs core "
2768                      "thinking we have %d ports, email greg@kroah.com this info.",
2769                      __FUNCTION__, edge_serial->product_info.NumPorts,
2770                      serial->num_ports);
2771         }
2772
2773         dbg("%s - time 1 %ld", __FUNCTION__, jiffies);
2774
2775         /* now load the application firmware into this device */
2776         load_application_firmware (edge_serial);
2777
2778         dbg("%s - time 2 %ld", __FUNCTION__, jiffies);
2779
2780         /* Check current Edgeport EEPROM and update if necessary */
2781         update_edgeport_E2PROM (edge_serial);
2782
2783         dbg("%s - time 3 %ld", __FUNCTION__, jiffies);
2784
2785         /* set the configuration to use #1 */
2786 //      dbg("set_configuration 1");
2787 //      usb_set_configuration (dev, 1);
2788
2789         /* we set up the pointers to the endpoints in the edge_open function,
2790          * as the structures aren't created yet. */
2791
2792         /* set up our port private structures */
2793         for (i = 0; i < serial->num_ports; ++i) {
2794                 edge_port = kmalloc (sizeof(struct edgeport_port), GFP_KERNEL);
2795                 if (edge_port == NULL) {
2796                         dev_err(&serial->dev->dev, "%s - Out of memory\n", __FUNCTION__);
2797                         for (j = 0; j < i; ++j) {
2798                                 kfree (usb_get_serial_port_data(serial->port[j]));
2799                                 usb_set_serial_port_data(serial->port[j],  NULL);
2800                         }
2801                         usb_set_serial_data(serial, NULL);
2802                         kfree(edge_serial);
2803                         return -ENOMEM;
2804                 }
2805                 memset (edge_port, 0, sizeof(struct edgeport_port));
2806                 spin_lock_init(&edge_port->ep_lock);
2807                 edge_port->port = serial->port[i];
2808                 usb_set_serial_port_data(serial->port[i], edge_port);
2809         }
2810
2811         return 0;
2812 }
2813
2814
2815 /****************************************************************************
2816  * edge_shutdown
2817  *      This function is called whenever the device is removed from the usb bus.
2818  ****************************************************************************/
2819 static void edge_shutdown (struct usb_serial *serial)
2820 {
2821         int i;
2822
2823         dbg("%s", __FUNCTION__);
2824
2825         /* stop reads and writes on all ports */
2826         for (i=0; i < serial->num_ports; ++i) {
2827                 kfree (usb_get_serial_port_data(serial->port[i]));
2828                 usb_set_serial_port_data(serial->port[i],  NULL);
2829         }
2830         kfree (usb_get_serial_data(serial));
2831         usb_set_serial_data(serial, NULL);
2832 }
2833
2834
2835 /****************************************************************************
2836  * edgeport_init
2837  *      This is called by the module subsystem, or on startup to initialize us
2838  ****************************************************************************/
2839 static int __init edgeport_init(void)
2840 {
2841         int retval;
2842
2843         retval = usb_serial_register(&edgeport_2port_device);
2844         if (retval)
2845                 goto failed_2port_device_register;
2846         retval = usb_serial_register(&edgeport_4port_device);
2847         if (retval)
2848                 goto failed_4port_device_register;
2849         retval = usb_serial_register(&edgeport_8port_device);
2850         if (retval)
2851                 goto failed_8port_device_register;
2852         retval = usb_register(&io_driver);
2853         if (retval)
2854                 goto failed_usb_register;
2855         info(DRIVER_DESC " " DRIVER_VERSION);
2856         return 0;
2857
2858 failed_usb_register:
2859         usb_serial_deregister(&edgeport_8port_device);
2860 failed_8port_device_register:
2861         usb_serial_deregister(&edgeport_4port_device);
2862 failed_4port_device_register:
2863         usb_serial_deregister(&edgeport_2port_device);
2864 failed_2port_device_register:
2865         return retval;
2866 }
2867
2868
2869 /****************************************************************************
2870  * edgeport_exit
2871  *      Called when the driver is about to be unloaded.
2872  ****************************************************************************/
2873 static void __exit edgeport_exit (void)
2874 {
2875         usb_deregister (&io_driver);
2876         usb_serial_deregister (&edgeport_2port_device);
2877         usb_serial_deregister (&edgeport_4port_device);
2878         usb_serial_deregister (&edgeport_8port_device);
2879 }
2880
2881 module_init(edgeport_init);
2882 module_exit(edgeport_exit);
2883
2884 /* Module information */
2885 MODULE_AUTHOR( DRIVER_AUTHOR );
2886 MODULE_DESCRIPTION( DRIVER_DESC );
2887 MODULE_LICENSE("GPL");
2888
2889 module_param(debug, bool, S_IRUGO | S_IWUSR);
2890 MODULE_PARM_DESC(debug, "Debug enabled or not");
2891
2892 module_param(low_latency, bool, S_IRUGO | S_IWUSR);
2893 MODULE_PARM_DESC(low_latency, "Low latency enabled or not");