git.oblomov.eu Git - linux-2.6/blob - drivers/usb/serial/cypress_m8.c

   1 /*
   2  * USB Cypress M8 driver
   3  *
   4  *      Copyright (C) 2004
   5  *          Lonnie Mendez (dignome@gmail.com)
   6  *      Copyright (C) 2003,2004
   7  *          Neil Whelchel (koyama@firstlight.net)
   8  *
   9  *      This program is free software; you can redistribute it and/or modify
  10  *      it under the terms of the GNU General Public License as published by
  11  *      the Free Software Foundation; either version 2 of the License, or
  12  *      (at your option) any later version.
  13  *
  14  * See Documentation/usb/usb-serial.txt for more information on using this driver
  15  *
  16  * See http://geocities.com/i0xox0i for information on this driver and the
  17  * earthmate usb device.
  18  *
  19  *  Lonnie Mendez <dignome@gmail.com>
  20  *  4-29-2005
  21  *      Fixed problem where setting or retreiving the serial config would fail with
  22  *      EPIPE.  Removed CRTS toggling so the driver behaves more like other usbserial
  23  *      adapters.  Issued new interval of 1ms instead of the default 10ms.  As a
  24  *      result, transfer speed has been substantially increased.  From avg. 850bps to
  25  *      avg. 3300bps.  initial termios has also been modified.  Cleaned up code and
  26  *      formatting issues so it is more readable.  Replaced the C++ style comments.
  27  *
  28  *  Lonnie Mendez <dignome@gmail.com>
  29  *  12-15-2004
  30  *      Incorporated write buffering from pl2303 driver.  Fixed bug with line
  31  *      handling so both lines are raised in cypress_open. (was dropping rts)
  32  *      Various code cleanups made as well along with other misc bug fixes.
  33  *
  34  *  Lonnie Mendez <dignome@gmail.com>
  35  *  04-10-2004
  36  *      Driver modified to support dynamic line settings.  Various improvments
  37  *      and features.
  38  *
  39  *  Neil Whelchel
  40  *  10-2003
  41  *      Driver first released.
  42  *
  43  */
  44
  45 /* Thanks to Neil Whelchel for writing the first cypress m8 implementation for linux. */
  46 /* Thanks to cypress for providing references for the hid reports. */
  47 /* Thanks to Jiang Zhang for providing links and for general help. */
  48 /* Code originates and was built up from ftdi_sio, belkin, pl2303 and others. */
  49
  50
  51 #include <linux/kernel.h>
  52 #include <linux/errno.h>
  53 #include <linux/init.h>
  54 #include <linux/slab.h>
  55 #include <linux/tty.h>
  56 #include <linux/tty_driver.h>
  57 #include <linux/tty_flip.h>
  58 #include <linux/module.h>
  59 #include <linux/moduleparam.h>
  60 #include <linux/spinlock.h>
  61 #include <linux/usb.h>
  62 #include <linux/usb/serial.h>
  63 #include <linux/serial.h>
  64 #include <linux/delay.h>
  65 #include <asm/uaccess.h>
  66
  67 #include "cypress_m8.h"
  68
  69
  70 #ifdef CONFIG_USB_SERIAL_DEBUG
  71         static int debug = 1;
  72 #else
  73         static int debug;
  74 #endif
  75 static int stats;
  76 static int interval;
  77
  78 /*
  79  * Version Information
  80  */
  81 #define DRIVER_VERSION "v1.09"
  82 #define DRIVER_AUTHOR "Lonnie Mendez <dignome@gmail.com>, Neil Whelchel <koyama@firstlight.net>"
  83 #define DRIVER_DESC "Cypress USB to Serial Driver"
  84
  85 /* write buffer size defines */
  86 #define CYPRESS_BUF_SIZE        1024
  87 #define CYPRESS_CLOSING_WAIT    (30*HZ)
  88
  89 static struct usb_device_id id_table_earthmate [] = {
  90         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
  91         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
  92         { }                                             /* Terminating entry */
  93 };
  94
  95 static struct usb_device_id id_table_cyphidcomrs232 [] = {
  96         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
  97         { }                                             /* Terminating entry */
  98 };
  99
 100 static struct usb_device_id id_table_nokiaca42v2 [] = {
 101         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
 102         { }                                             /* Terminating entry */
 103 };
 104
 105 static struct usb_device_id id_table_combined [] = {
 106         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB) },
 107         { USB_DEVICE(VENDOR_ID_DELORME, PRODUCT_ID_EARTHMATEUSB_LT20) },
 108         { USB_DEVICE(VENDOR_ID_CYPRESS, PRODUCT_ID_CYPHIDCOM) },
 109         { USB_DEVICE(VENDOR_ID_DAZZLE, PRODUCT_ID_CA42) },
 110         { }                                             /* Terminating entry */
 111 };
 112
 113 MODULE_DEVICE_TABLE (usb, id_table_combined);
 114
 115 static struct usb_driver cypress_driver = {
 116         .name =         "cypress",
 117         .probe =        usb_serial_probe,
 118         .disconnect =   usb_serial_disconnect,
 119         .id_table =     id_table_combined,
 120         .no_dynamic_id =        1,
 121 };
 122
 123 struct cypress_private {
 124         spinlock_t lock;                   /* private lock */
 125         int chiptype;                      /* identifier of device, for quirks/etc */
 126         int bytes_in;                      /* used for statistics */
 127         int bytes_out;                     /* used for statistics */
 128         int cmd_count;                     /* used for statistics */
 129         int cmd_ctrl;                      /* always set this to 1 before issuing a command */
 130         struct cypress_buf *buf;           /* write buffer */
 131         int write_urb_in_use;              /* write urb in use indicator */
 132         int write_urb_interval;            /* interval to use for write urb */
 133         int read_urb_interval;             /* interval to use for read urb */
 134         int comm_is_ok;                    /* true if communication is (still) ok */
 135         int termios_initialized;
 136         __u8 line_control;                 /* holds dtr / rts value */
 137         __u8 current_status;               /* received from last read - info on dsr,cts,cd,ri,etc */
 138         __u8 current_config;               /* stores the current configuration byte */
 139         __u8 rx_flags;                     /* throttling - used from whiteheat/ftdi_sio */
 140         int baud_rate;                     /* stores current baud rate in integer form */
 141         int cbr_mask;                      /* stores current baud rate in masked form */
 142         int isthrottled;                   /* if throttled, discard reads */
 143         wait_queue_head_t delta_msr_wait;  /* used for TIOCMIWAIT */
 144         char prev_status, diff_status;     /* used for TIOCMIWAIT */
 145         /* we pass a pointer to this as the arguement sent to cypress_set_termios old_termios */
 146         struct ktermios tmp_termios;       /* stores the old termios settings */
 147 };
 148
 149 /* write buffer structure */
 150 struct cypress_buf {
 151         unsigned int    buf_size;
 152         char            *buf_buf;
 153         char            *buf_get;
 154         char            *buf_put;
 155 };
 156
 157 /* function prototypes for the Cypress USB to serial device */
 158 static int  cypress_earthmate_startup   (struct usb_serial *serial);
 159 static int  cypress_hidcom_startup      (struct usb_serial *serial);
 160 static int  cypress_ca42v2_startup      (struct usb_serial *serial);
 161 static void cypress_shutdown            (struct usb_serial *serial);
 162 static int  cypress_open                (struct usb_serial_port *port, struct file *filp);
 163 static void cypress_close               (struct usb_serial_port *port, struct file *filp);
 164 static int  cypress_write               (struct usb_serial_port *port, const unsigned char *buf, int count);
 165 static void cypress_send                (struct usb_serial_port *port);
 166 static int  cypress_write_room          (struct usb_serial_port *port);
 167 static int  cypress_ioctl               (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
 168 static void cypress_set_termios         (struct usb_serial_port *port, struct ktermios * old);
 169 static int  cypress_tiocmget            (struct usb_serial_port *port, struct file *file);
 170 static int  cypress_tiocmset            (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
 171 static int  cypress_chars_in_buffer     (struct usb_serial_port *port);
 172 static void cypress_throttle            (struct usb_serial_port *port);
 173 static void cypress_unthrottle          (struct usb_serial_port *port);
 174 static void cypress_set_dead            (struct usb_serial_port *port);
 175 static void cypress_read_int_callback   (struct urb *urb);
 176 static void cypress_write_int_callback  (struct urb *urb);
 177 /* baud helper functions */
 178 static int       mask_to_rate           (unsigned mask);
 179 static unsigned  rate_to_mask           (int rate);
 180 /* write buffer functions */
 181 static struct cypress_buf *cypress_buf_alloc(unsigned int size);
 182 static void               cypress_buf_free(struct cypress_buf *cb);
 183 static void               cypress_buf_clear(struct cypress_buf *cb);
 184 static unsigned int       cypress_buf_data_avail(struct cypress_buf *cb);
 185 static unsigned int       cypress_buf_space_avail(struct cypress_buf *cb);
 186 static unsigned int       cypress_buf_put(struct cypress_buf *cb, const char *buf, unsigned int count);
 187 static unsigned int       cypress_buf_get(struct cypress_buf *cb, char *buf, unsigned int count);
 188
 189
 190 static struct usb_serial_driver cypress_earthmate_device = {
 191         .driver = {
 192                 .owner =                THIS_MODULE,
 193                 .name =                 "earthmate",
 194         },
 195         .description =                  "DeLorme Earthmate USB",
 196         .usb_driver =                   &cypress_driver,
 197         .id_table =                     id_table_earthmate,
 198         .num_interrupt_in =             1,
 199         .num_interrupt_out =            1,
 200         .num_bulk_in =                  NUM_DONT_CARE,
 201         .num_bulk_out =                 NUM_DONT_CARE,
 202         .num_ports =                    1,
 203         .attach =                       cypress_earthmate_startup,
 204         .shutdown =                     cypress_shutdown,
 205         .open =                         cypress_open,
 206         .close =                        cypress_close,
 207         .write =                        cypress_write,
 208         .write_room =                   cypress_write_room,
 209         .ioctl =                        cypress_ioctl,
 210         .set_termios =                  cypress_set_termios,
 211         .tiocmget =                     cypress_tiocmget,
 212         .tiocmset =                     cypress_tiocmset,
 213         .chars_in_buffer =              cypress_chars_in_buffer,
 214         .throttle =                     cypress_throttle,
 215         .unthrottle =                   cypress_unthrottle,
 216         .read_int_callback =            cypress_read_int_callback,
 217         .write_int_callback =           cypress_write_int_callback,
 218 };
 219
 220 static struct usb_serial_driver cypress_hidcom_device = {
 221         .driver = {
 222                 .owner =                THIS_MODULE,
 223                 .name =                 "cyphidcom",
 224         },
 225         .description =                  "HID->COM RS232 Adapter",
 226         .usb_driver =                   &cypress_driver,
 227         .id_table =                     id_table_cyphidcomrs232,
 228         .num_interrupt_in =             1,
 229         .num_interrupt_out =            1,
 230         .num_bulk_in =                  NUM_DONT_CARE,
 231         .num_bulk_out =                 NUM_DONT_CARE,
 232         .num_ports =                    1,
 233         .attach =                       cypress_hidcom_startup,
 234         .shutdown =                     cypress_shutdown,
 235         .open =                         cypress_open,
 236         .close =                        cypress_close,
 237         .write =                        cypress_write,
 238         .write_room =                   cypress_write_room,
 239         .ioctl =                        cypress_ioctl,
 240         .set_termios =                  cypress_set_termios,
 241         .tiocmget =                     cypress_tiocmget,
 242         .tiocmset =                     cypress_tiocmset,
 243         .chars_in_buffer =              cypress_chars_in_buffer,
 244         .throttle =                     cypress_throttle,
 245         .unthrottle =                   cypress_unthrottle,
 246         .read_int_callback =            cypress_read_int_callback,
 247         .write_int_callback =           cypress_write_int_callback,
 248 };
 249
 250 static struct usb_serial_driver cypress_ca42v2_device = {
 251         .driver = {
 252                 .owner =                THIS_MODULE,
 253                 .name =                 "nokiaca42v2",
 254         },
 255         .description =                  "Nokia CA-42 V2 Adapter",
 256         .usb_driver =                   &cypress_driver,
 257         .id_table =                     id_table_nokiaca42v2,
 258         .num_interrupt_in =             1,
 259         .num_interrupt_out =            1,
 260         .num_bulk_in =                  NUM_DONT_CARE,
 261         .num_bulk_out =                 NUM_DONT_CARE,
 262         .num_ports =                    1,
 263         .attach =                       cypress_ca42v2_startup,
 264         .shutdown =                     cypress_shutdown,
 265         .open =                         cypress_open,
 266         .close =                        cypress_close,
 267         .write =                        cypress_write,
 268         .write_room =                   cypress_write_room,
 269         .ioctl =                        cypress_ioctl,
 270         .set_termios =                  cypress_set_termios,
 271         .tiocmget =                     cypress_tiocmget,
 272         .tiocmset =                     cypress_tiocmset,
 273         .chars_in_buffer =              cypress_chars_in_buffer,
 274         .throttle =                     cypress_throttle,
 275         .unthrottle =                   cypress_unthrottle,
 276         .read_int_callback =            cypress_read_int_callback,
 277         .write_int_callback =           cypress_write_int_callback,
 278 };
 279
 280 /*****************************************************************************
 281  * Cypress serial helper functions
 282  *****************************************************************************/
 283
 284
 285 /* This function can either set or retrieve the current serial line settings */
 286 static int cypress_serial_control (struct usb_serial_port *port, unsigned baud_mask, int data_bits, int stop_bits,
 287                                    int parity_enable, int parity_type, int reset, int cypress_request_type)
 288 {
 289         int new_baudrate = 0, retval = 0, tries = 0;
 290         struct cypress_private *priv;
 291         __u8 feature_buffer[8];
 292         unsigned long flags;
 293
 294         dbg("%s", __FUNCTION__);
 295
 296         priv = usb_get_serial_port_data(port);
 297
 298         if (!priv->comm_is_ok)
 299                 return -ENODEV;
 300
 301         switch(cypress_request_type) {
 302                 case CYPRESS_SET_CONFIG:
 303
 304                         /*
 305                          * The general purpose firmware for the Cypress M8 allows for a maximum speed
 306                          * of 57600bps (I have no idea whether DeLorme chose to use the general purpose
 307                          * firmware or not), if you need to modify this speed setting for your own
 308                          * project please add your own chiptype and modify the code likewise.  The
 309                          * Cypress HID->COM device will work successfully up to 115200bps (but the
 310                          * actual throughput is around 3kBps).
 311                          */
 312                         if (baud_mask != priv->cbr_mask) {
 313                                 dbg("%s - baud rate is changing", __FUNCTION__);
 314                                 if ( priv->chiptype == CT_EARTHMATE ) {
 315                                         /* 300 and 600 baud rates are supported under the generic firmware,
 316                                          * but are not used with NMEA and SiRF protocols */
 317
 318                                         if ( (baud_mask == B300) || (baud_mask == B600) ) {
 319                                                 err("%s - failed setting baud rate, unsupported speed",
 320                                                     __FUNCTION__);
 321                                                 new_baudrate = priv->baud_rate;
 322                                         } else if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
 323                                                 err("%s - failed setting baud rate, unsupported speed",
 324                                                     __FUNCTION__);
 325                                                 new_baudrate = priv->baud_rate;
 326                                         }
 327                                 } else if (priv->chiptype == CT_CYPHIDCOM) {
 328                                         if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
 329                                                 err("%s - failed setting baud rate, unsupported speed",
 330                                                     __FUNCTION__);
 331                                                 new_baudrate = priv->baud_rate;
 332                                         }
 333                                 } else if (priv->chiptype == CT_CA42V2) {
 334                                         if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
 335                                                 err("%s - failed setting baud rate, unsupported speed",
 336                                                     __FUNCTION__);
 337                                                 new_baudrate = priv->baud_rate;
 338                                         }
 339                                 } else if (priv->chiptype == CT_GENERIC) {
 340                                         if ( (new_baudrate = mask_to_rate(baud_mask)) == -1) {
 341                                                 err("%s - failed setting baud rate, unsupported speed",
 342                                                     __FUNCTION__);
 343                                                 new_baudrate = priv->baud_rate;
 344                                         }
 345                                 } else {
 346                                         info("%s - please define your chiptype", __FUNCTION__);
 347                                         new_baudrate = priv->baud_rate;
 348                                 }
 349                         } else {  /* baud rate not changing, keep the old */
 350                                 new_baudrate = priv->baud_rate;
 351                         }
 352                         dbg("%s - baud rate is being sent as %d", __FUNCTION__, new_baudrate);
 353
 354                         memset(feature_buffer, 0, 8);
 355                         /* fill the feature_buffer with new configuration */
 356                         *((u_int32_t *)feature_buffer) = new_baudrate;
 357
 358                         feature_buffer[4] |= data_bits;   /* assign data bits in 2 bit space ( max 3 ) */
 359                         /* 1 bit gap */
 360                         feature_buffer[4] |= (stop_bits << 3);   /* assign stop bits in 1 bit space */
 361                         feature_buffer[4] |= (parity_enable << 4);   /* assign parity flag in 1 bit space */
 362                         feature_buffer[4] |= (parity_type << 5);   /* assign parity type in 1 bit space */
 363                         /* 1 bit gap */
 364                         feature_buffer[4] |= (reset << 7);   /* assign reset at end of byte, 1 bit space */
 365
 366                         dbg("%s - device is being sent this feature report:", __FUNCTION__);
 367                         dbg("%s - %02X - %02X - %02X - %02X - %02X", __FUNCTION__, feature_buffer[0], feature_buffer[1],
 368                             feature_buffer[2], feature_buffer[3], feature_buffer[4]);
 369
 370                         do {
 371                         retval = usb_control_msg (port->serial->dev, usb_sndctrlpipe(port->serial->dev, 0),
 372                                                   HID_REQ_SET_REPORT, USB_DIR_OUT | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 373                                                           0x0300, 0, feature_buffer, 8, 500);
 374
 375                                 if (tries++ >= 3)
 376                                         break;
 377
 378                         } while (retval != 8 && retval != -ENODEV);
 379
 380                         if (retval != 8) {
 381                                 err("%s - failed sending serial line settings - %d", __FUNCTION__, retval);
 382                                 cypress_set_dead(port);
 383                         } else {
 384                                 spin_lock_irqsave(&priv->lock, flags);
 385                                 priv->baud_rate = new_baudrate;
 386                                 priv->cbr_mask = baud_mask;
 387                                 priv->current_config = feature_buffer[4];
 388                                 spin_unlock_irqrestore(&priv->lock, flags);
 389                         }
 390                 break;
 391                 case CYPRESS_GET_CONFIG:
 392                         dbg("%s - retreiving serial line settings", __FUNCTION__);
 393                         /* set initial values in feature buffer */
 394                         memset(feature_buffer, 0, 8);
 395
 396                         do {
 397                         retval = usb_control_msg (port->serial->dev, usb_rcvctrlpipe(port->serial->dev, 0),
 398                                                   HID_REQ_GET_REPORT, USB_DIR_IN | USB_RECIP_INTERFACE | USB_TYPE_CLASS,
 399                                                           0x0300, 0, feature_buffer, 8, 500);
 400
 401                                 if (tries++ >= 3)
 402                                         break;
 403
 404                         } while (retval != 5 && retval != -ENODEV);
 405
 406                         if (retval != 5) {
 407                                 err("%s - failed to retrieve serial line settings - %d", __FUNCTION__, retval);
 408                                 cypress_set_dead(port);
 409                                 return retval;
 410                         } else {
 411                                 spin_lock_irqsave(&priv->lock, flags);
 412
 413                                 /* store the config in one byte, and later use bit masks to check values */
 414                                 priv->current_config = feature_buffer[4];
 415                                 priv->baud_rate = *((u_int32_t *)feature_buffer);
 416
 417                                 if ( (priv->cbr_mask = rate_to_mask(priv->baud_rate)) == 0x40)
 418                                         dbg("%s - failed setting the baud mask (not defined)", __FUNCTION__);
 419                                 spin_unlock_irqrestore(&priv->lock, flags);
 420                         }
 421         }
 422         spin_lock_irqsave(&priv->lock, flags);
 423         ++priv->cmd_count;
 424         spin_unlock_irqrestore(&priv->lock, flags);
 425
 426         return retval;
 427 } /* cypress_serial_control */
 428
 429
 430 static void cypress_set_dead(struct usb_serial_port *port)
 431 {
 432         struct cypress_private *priv = usb_get_serial_port_data(port);
 433         unsigned long flags;
 434
 435         spin_lock_irqsave(&priv->lock, flags);
 436         if (!priv->comm_is_ok) {
 437                 spin_unlock_irqrestore(&priv->lock, flags);
 438                 return;
 439         }
 440         priv->comm_is_ok = 0;
 441         spin_unlock_irqrestore(&priv->lock, flags);
 442
 443         err("cypress_m8 suspending failing port %d - interval might be too short",
 444             port->number);
 445 }
 446
 447
 448 /* given a baud mask, it will return integer baud on success */
 449 static int mask_to_rate (unsigned mask)
 450 {
 451         int rate;
 452
 453         switch (mask) {
 454                 case B0: rate = 0; break;
 455                 case B300: rate = 300; break;
 456                 case B600: rate = 600; break;
 457                 case B1200: rate = 1200; break;
 458                 case B2400: rate = 2400; break;
 459                 case B4800: rate = 4800; break;
 460                 case B9600: rate = 9600; break;
 461                 case B19200: rate = 19200; break;
 462                 case B38400: rate = 38400; break;
 463                 case B57600: rate = 57600; break;
 464                 case B115200: rate = 115200; break;
 465                 default: rate = -1;
 466         }
 467
 468         return rate;
 469 }
 470
 471
 472 static unsigned rate_to_mask (int rate)
 473 {
 474         unsigned mask;
 475
 476         switch (rate) {
 477                 case 0: mask = B0; break;
 478                 case 300: mask = B300; break;
 479                 case 600: mask = B600; break;
 480                 case 1200: mask = B1200; break;
 481                 case 2400: mask = B2400; break;
 482                 case 4800: mask = B4800; break;
 483                 case 9600: mask = B9600; break;
 484                 case 19200: mask = B19200; break;
 485                 case 38400: mask = B38400; break;
 486                 case 57600: mask = B57600; break;
 487                 case 115200: mask = B115200; break;
 488                 default: mask = 0x40;
 489         }
 490
 491         return mask;
 492 }
 493 /*****************************************************************************
 494  * Cypress serial driver functions
 495  *****************************************************************************/
 496
 497
 498 static int generic_startup (struct usb_serial *serial)
 499 {
 500         struct cypress_private *priv;
 501         struct usb_serial_port *port = serial->port[0];
 502
 503         dbg("%s - port %d", __FUNCTION__, port->number);
 504
 505         priv = kzalloc(sizeof (struct cypress_private), GFP_KERNEL);
 506         if (!priv)
 507                 return -ENOMEM;
 508
 509         priv->comm_is_ok = !0;
 510         spin_lock_init(&priv->lock);
 511         priv->buf = cypress_buf_alloc(CYPRESS_BUF_SIZE);
 512         if (priv->buf == NULL) {
 513                 kfree(priv);
 514                 return -ENOMEM;
 515         }
 516         init_waitqueue_head(&priv->delta_msr_wait);
 517
 518         usb_reset_configuration (serial->dev);
 519
 520         priv->cmd_ctrl = 0;
 521         priv->line_control = 0;
 522         priv->termios_initialized = 0;
 523         priv->rx_flags = 0;
 524         priv->cbr_mask = B300;
 525         if (interval > 0) {
 526                 priv->write_urb_interval = interval;
 527                 priv->read_urb_interval = interval;
 528                 dbg("%s - port %d read & write intervals forced to %d",
 529                     __FUNCTION__,port->number,interval);
 530         } else {
 531                 priv->write_urb_interval = port->interrupt_out_urb->interval;
 532                 priv->read_urb_interval = port->interrupt_in_urb->interval;
 533                 dbg("%s - port %d intervals: read=%d write=%d",
 534                     __FUNCTION__,port->number,
 535                     priv->read_urb_interval,priv->write_urb_interval);
 536         }
 537         usb_set_serial_port_data(port, priv);
 538
 539         return 0;
 540 }
 541
 542
 543 static int cypress_earthmate_startup (struct usb_serial *serial)
 544 {
 545         struct cypress_private *priv;
 546
 547         dbg("%s", __FUNCTION__);
 548
 549         if (generic_startup(serial)) {
 550                 dbg("%s - Failed setting up port %d", __FUNCTION__,
 551                                 serial->port[0]->number);
 552                 return 1;
 553         }
 554
 555         priv = usb_get_serial_port_data(serial->port[0]);
 556         priv->chiptype = CT_EARTHMATE;
 557
 558         return 0;
 559 } /* cypress_earthmate_startup */
 560
 561
 562 static int cypress_hidcom_startup (struct usb_serial *serial)
 563 {
 564         struct cypress_private *priv;
 565
 566         dbg("%s", __FUNCTION__);
 567
 568         if (generic_startup(serial)) {
 569                 dbg("%s - Failed setting up port %d", __FUNCTION__,
 570                                 serial->port[0]->number);
 571                 return 1;
 572         }
 573
 574         priv = usb_get_serial_port_data(serial->port[0]);
 575         priv->chiptype = CT_CYPHIDCOM;
 576
 577         return 0;
 578 } /* cypress_hidcom_startup */
 579
 580
 581 static int cypress_ca42v2_startup (struct usb_serial *serial)
 582 {
 583         struct cypress_private *priv;
 584
 585         dbg("%s", __FUNCTION__);
 586
 587         if (generic_startup(serial)) {
 588                 dbg("%s - Failed setting up port %d", __FUNCTION__,
 589                                 serial->port[0]->number);
 590                 return 1;
 591         }
 592
 593         priv = usb_get_serial_port_data(serial->port[0]);
 594         priv->chiptype = CT_CA42V2;
 595
 596         return 0;
 597 } /* cypress_ca42v2_startup */
 598
 599
 600 static void cypress_shutdown (struct usb_serial *serial)
 601 {
 602         struct cypress_private *priv;
 603
 604         dbg ("%s - port %d", __FUNCTION__, serial->port[0]->number);
 605
 606         /* all open ports are closed at this point */
 607
 608         priv = usb_get_serial_port_data(serial->port[0]);
 609
 610         if (priv) {
 611                 cypress_buf_free(priv->buf);
 612                 kfree(priv);
 613                 usb_set_serial_port_data(serial->port[0], NULL);
 614         }
 615 }
 616
 617
 618 static int cypress_open (struct usb_serial_port *port, struct file *filp)
 619 {
 620         struct cypress_private *priv = usb_get_serial_port_data(port);
 621         struct usb_serial *serial = port->serial;
 622         unsigned long flags;
 623         int result = 0;
 624
 625         dbg("%s - port %d", __FUNCTION__, port->number);
 626
 627         if (!priv->comm_is_ok)
 628                 return -EIO;
 629
 630         /* clear halts before open */
 631         usb_clear_halt(serial->dev, 0x81);
 632         usb_clear_halt(serial->dev, 0x02);
 633
 634         spin_lock_irqsave(&priv->lock, flags);
 635         /* reset read/write statistics */
 636         priv->bytes_in = 0;
 637         priv->bytes_out = 0;
 638         priv->cmd_count = 0;
 639         priv->rx_flags = 0;
 640         spin_unlock_irqrestore(&priv->lock, flags);
 641
 642         /* setting to zero could cause data loss */
 643         port->tty->low_latency = 1;
 644
 645         /* raise both lines and set termios */
 646         spin_lock_irqsave(&priv->lock, flags);
 647         priv->line_control = CONTROL_DTR | CONTROL_RTS;
 648         priv->cmd_ctrl = 1;
 649         spin_unlock_irqrestore(&priv->lock, flags);
 650         result = cypress_write(port, NULL, 0);
 651
 652         if (result) {
 653                 dev_err(&port->dev, "%s - failed setting the control lines - error %d\n", __FUNCTION__, result);
 654                 return result;
 655         } else
 656                 dbg("%s - success setting the control lines", __FUNCTION__);
 657
 658         cypress_set_termios(port, &priv->tmp_termios);
 659
 660         /* setup the port and start reading from the device */
 661         if(!port->interrupt_in_urb){
 662                 err("%s - interrupt_in_urb is empty!", __FUNCTION__);
 663                 return(-1);
 664         }
 665
 666         usb_fill_int_urb(port->interrupt_in_urb, serial->dev,
 667                 usb_rcvintpipe(serial->dev, port->interrupt_in_endpointAddress),
 668                 port->interrupt_in_urb->transfer_buffer, port->interrupt_in_urb->transfer_buffer_length,
 669                 cypress_read_int_callback, port, priv->read_urb_interval);
 670         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 671
 672         if (result){
 673                 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
 674                 cypress_set_dead(port);
 675         }
 676
 677         return result;
 678 } /* cypress_open */
 679
 680
 681 static void cypress_close(struct usb_serial_port *port, struct file * filp)
 682 {
 683         struct cypress_private *priv = usb_get_serial_port_data(port);
 684         unsigned int c_cflag;
 685         unsigned long flags;
 686         int bps;
 687         long timeout;
 688         wait_queue_t wait;
 689
 690         dbg("%s - port %d", __FUNCTION__, port->number);
 691
 692         /* wait for data to drain from buffer */
 693         spin_lock_irqsave(&priv->lock, flags);
 694         timeout = CYPRESS_CLOSING_WAIT;
 695         init_waitqueue_entry(&wait, current);
 696         add_wait_queue(&port->tty->write_wait, &wait);
 697         for (;;) {
 698                 set_current_state(TASK_INTERRUPTIBLE);
 699                 if (cypress_buf_data_avail(priv->buf) == 0
 700                 || timeout == 0 || signal_pending(current)
 701                 || !usb_get_intfdata(port->serial->interface))
 702                         break;
 703                 spin_unlock_irqrestore(&priv->lock, flags);
 704                 timeout = schedule_timeout(timeout);
 705                 spin_lock_irqsave(&priv->lock, flags);
 706         }
 707         set_current_state(TASK_RUNNING);
 708         remove_wait_queue(&port->tty->write_wait, &wait);
 709         /* clear out any remaining data in the buffer */
 710         cypress_buf_clear(priv->buf);
 711         spin_unlock_irqrestore(&priv->lock, flags);
 712
 713         /* wait for characters to drain from device */
 714         bps = tty_get_baud_rate(port->tty);
 715         if (bps > 1200)
 716                 timeout = max((HZ*2560)/bps,HZ/10);
 717         else
 718                 timeout = 2*HZ;
 719         schedule_timeout_interruptible(timeout);
 720
 721         dbg("%s - stopping urbs", __FUNCTION__);
 722         usb_kill_urb (port->interrupt_in_urb);
 723         usb_kill_urb (port->interrupt_out_urb);
 724
 725         if (port->tty) {
 726                 c_cflag = port->tty->termios->c_cflag;
 727                 if (c_cflag & HUPCL) {
 728                         /* drop dtr and rts */
 729                         priv = usb_get_serial_port_data(port);
 730                         spin_lock_irqsave(&priv->lock, flags);
 731                         priv->line_control = 0;
 732                         priv->cmd_ctrl = 1;
 733                         spin_unlock_irqrestore(&priv->lock, flags);
 734                         cypress_write(port, NULL, 0);
 735                 }
 736         }
 737
 738         if (stats)
 739                 dev_info (&port->dev, "Statistics: %d Bytes In | %d Bytes Out | %d Commands Issued\n",
 740                           priv->bytes_in, priv->bytes_out, priv->cmd_count);
 741 } /* cypress_close */
 742
 743
 744 static int cypress_write(struct usb_serial_port *port, const unsigned char *buf, int count)
 745 {
 746         struct cypress_private *priv = usb_get_serial_port_data(port);
 747         unsigned long flags;
 748
 749         dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
 750
 751         /* line control commands, which need to be executed immediately,
 752            are not put into the buffer for obvious reasons.
 753          */
 754         if (priv->cmd_ctrl) {
 755                 count = 0;
 756                 goto finish;
 757         }
 758
 759         if (!count)
 760                 return count;
 761
 762         spin_lock_irqsave(&priv->lock, flags);
 763         count = cypress_buf_put(priv->buf, buf, count);
 764         spin_unlock_irqrestore(&priv->lock, flags);
 765
 766 finish:
 767         cypress_send(port);
 768
 769         return count;
 770 } /* cypress_write */
 771
 772
 773 static void cypress_send(struct usb_serial_port *port)
 774 {
 775         int count = 0, result, offset, actual_size;
 776         struct cypress_private *priv = usb_get_serial_port_data(port);
 777         unsigned long flags;
 778
 779         if (!priv->comm_is_ok)
 780                 return;
 781
 782         dbg("%s - port %d", __FUNCTION__, port->number);
 783         dbg("%s - interrupt out size is %d", __FUNCTION__, port->interrupt_out_size);
 784
 785         spin_lock_irqsave(&priv->lock, flags);
 786         if (priv->write_urb_in_use) {
 787                 dbg("%s - can't write, urb in use", __FUNCTION__);
 788                 spin_unlock_irqrestore(&priv->lock, flags);
 789                 return;
 790         }
 791         spin_unlock_irqrestore(&priv->lock, flags);
 792
 793         /* clear buffer */
 794         memset(port->interrupt_out_urb->transfer_buffer, 0, port->interrupt_out_size);
 795
 796         spin_lock_irqsave(&priv->lock, flags);
 797         switch (port->interrupt_out_size) {
 798                 case 32:
 799                         /* this is for the CY7C64013... */
 800                         offset = 2;
 801                         port->interrupt_out_buffer[0] = priv->line_control;
 802                         break;
 803                 case 8:
 804                         /* this is for the CY7C63743... */
 805                         offset = 1;
 806                         port->interrupt_out_buffer[0] = priv->line_control;
 807                         break;
 808                 default:
 809                         dbg("%s - wrong packet size", __FUNCTION__);
 810                         spin_unlock_irqrestore(&priv->lock, flags);
 811                         return;
 812         }
 813
 814         if (priv->line_control & CONTROL_RESET)
 815                 priv->line_control &= ~CONTROL_RESET;
 816
 817         if (priv->cmd_ctrl) {
 818                 priv->cmd_count++;
 819                 dbg("%s - line control command being issued", __FUNCTION__);
 820                 spin_unlock_irqrestore(&priv->lock, flags);
 821                 goto send;
 822         } else
 823                 spin_unlock_irqrestore(&priv->lock, flags);
 824
 825         count = cypress_buf_get(priv->buf, &port->interrupt_out_buffer[offset],
 826                                 port->interrupt_out_size-offset);
 827
 828         if (count == 0) {
 829                 return;
 830         }
 831
 832         switch (port->interrupt_out_size) {
 833                 case 32:
 834                         port->interrupt_out_buffer[1] = count;
 835                         break;
 836                 case 8:
 837                         port->interrupt_out_buffer[0] |= count;
 838         }
 839
 840         dbg("%s - count is %d", __FUNCTION__, count);
 841
 842 send:
 843         spin_lock_irqsave(&priv->lock, flags);
 844         priv->write_urb_in_use = 1;
 845         spin_unlock_irqrestore(&priv->lock, flags);
 846
 847         if (priv->cmd_ctrl)
 848                 actual_size = 1;
 849         else
 850                 actual_size = count + (port->interrupt_out_size == 32 ? 2 : 1);
 851
 852         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, port->interrupt_out_size,
 853                               port->interrupt_out_urb->transfer_buffer);
 854
 855         usb_fill_int_urb(port->interrupt_out_urb, port->serial->dev,
 856                 usb_sndintpipe(port->serial->dev, port->interrupt_out_endpointAddress),
 857                 port->interrupt_out_buffer, port->interrupt_out_size,
 858                 cypress_write_int_callback, port, priv->write_urb_interval);
 859         result = usb_submit_urb (port->interrupt_out_urb, GFP_ATOMIC);
 860         if (result) {
 861                 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__,
 862                         result);
 863                 priv->write_urb_in_use = 0;
 864                 cypress_set_dead(port);
 865         }
 866
 867         spin_lock_irqsave(&priv->lock, flags);
 868         if (priv->cmd_ctrl) {
 869                 priv->cmd_ctrl = 0;
 870         }
 871         priv->bytes_out += count; /* do not count the line control and size bytes */
 872         spin_unlock_irqrestore(&priv->lock, flags);
 873
 874         usb_serial_port_softint(port);
 875 } /* cypress_send */
 876
 877
 878 /* returns how much space is available in the soft buffer */
 879 static int cypress_write_room(struct usb_serial_port *port)
 880 {
 881         struct cypress_private *priv = usb_get_serial_port_data(port);
 882         int room = 0;
 883         unsigned long flags;
 884
 885         dbg("%s - port %d", __FUNCTION__, port->number);
 886
 887         spin_lock_irqsave(&priv->lock, flags);
 888         room = cypress_buf_space_avail(priv->buf);
 889         spin_unlock_irqrestore(&priv->lock, flags);
 890
 891         dbg("%s - returns %d", __FUNCTION__, room);
 892         return room;
 893 }
 894
 895
 896 static int cypress_tiocmget (struct usb_serial_port *port, struct file *file)
 897 {
 898         struct cypress_private *priv = usb_get_serial_port_data(port);
 899         __u8 status, control;
 900         unsigned int result = 0;
 901         unsigned long flags;
 902
 903         dbg("%s - port %d", __FUNCTION__, port->number);
 904
 905         spin_lock_irqsave(&priv->lock, flags);
 906         control = priv->line_control;
 907         status = priv->current_status;
 908         spin_unlock_irqrestore(&priv->lock, flags);
 909
 910         result = ((control & CONTROL_DTR)        ? TIOCM_DTR : 0)
 911                 | ((control & CONTROL_RTS)       ? TIOCM_RTS : 0)
 912                 | ((status & UART_CTS)        ? TIOCM_CTS : 0)
 913                 | ((status & UART_DSR)        ? TIOCM_DSR : 0)
 914                 | ((status & UART_RI)         ? TIOCM_RI  : 0)
 915                 | ((status & UART_CD)         ? TIOCM_CD  : 0);
 916
 917         dbg("%s - result = %x", __FUNCTION__, result);
 918
 919         return result;
 920 }
 921
 922
 923 static int cypress_tiocmset (struct usb_serial_port *port, struct file *file,
 924                                unsigned int set, unsigned int clear)
 925 {
 926         struct cypress_private *priv = usb_get_serial_port_data(port);
 927         unsigned long flags;
 928
 929         dbg("%s - port %d", __FUNCTION__, port->number);
 930
 931         spin_lock_irqsave(&priv->lock, flags);
 932         if (set & TIOCM_RTS)
 933                 priv->line_control |= CONTROL_RTS;
 934         if (set & TIOCM_DTR)
 935                 priv->line_control |= CONTROL_DTR;
 936         if (clear & TIOCM_RTS)
 937                 priv->line_control &= ~CONTROL_RTS;
 938         if (clear & TIOCM_DTR)
 939                 priv->line_control &= ~CONTROL_DTR;
 940         spin_unlock_irqrestore(&priv->lock, flags);
 941
 942         priv->cmd_ctrl = 1;
 943         return cypress_write(port, NULL, 0);
 944 }
 945
 946
 947 static int cypress_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
 948 {
 949         struct cypress_private *priv = usb_get_serial_port_data(port);
 950
 951         dbg("%s - port %d, cmd 0x%.4x", __FUNCTION__, port->number, cmd);
 952
 953         switch (cmd) {
 954                 case TIOCGSERIAL:
 955                         if (copy_to_user((void __user *)arg, port->tty->termios, sizeof(struct ktermios))) {
 956                                 return -EFAULT;
 957                         }
 958                         return (0);
 959                         break;
 960                 case TIOCSSERIAL:
 961                         if (copy_from_user(port->tty->termios, (void __user *)arg, sizeof(struct ktermios))) {
 962                                 return -EFAULT;
 963                         }
 964                         /* here we need to call cypress_set_termios to invoke the new settings */
 965                         cypress_set_termios(port, &priv->tmp_termios);
 966                         return (0);
 967                         break;
 968                 /* This code comes from drivers/char/serial.c and ftdi_sio.c */
 969                 case TIOCMIWAIT:
 970                         while (priv != NULL) {
 971                                 interruptible_sleep_on(&priv->delta_msr_wait);
 972                                 /* see if a signal did it */
 973                                 if (signal_pending(current))
 974                                         return -ERESTARTSYS;
 975                                 else {
 976                                         char diff = priv->diff_status;
 977
 978                                         if (diff == 0) {
 979                                                 return -EIO; /* no change => error */
 980                                         }
 981
 982                                         /* consume all events */
 983                                         priv->diff_status = 0;
 984
 985                                         /* return 0 if caller wanted to know about these bits */
 986                                         if ( ((arg & TIOCM_RNG) && (diff & UART_RI)) ||
 987                                              ((arg & TIOCM_DSR) && (diff & UART_DSR)) ||
 988                                              ((arg & TIOCM_CD) && (diff & UART_CD)) ||
 989                                              ((arg & TIOCM_CTS) && (diff & UART_CTS)) ) {
 990                                                 return 0;
 991                                         }
 992                                         /* otherwise caller can't care less about what happened,
 993                                          * and so we continue to wait for more events.
 994                                          */
 995                                 }
 996                         }
 997                         return 0;
 998                         break;
 999                 default:
1000                         break;
1001         }
1002
1003         dbg("%s - arg not supported - it was 0x%04x - check include/asm/ioctls.h", __FUNCTION__, cmd);
1004
1005         return -ENOIOCTLCMD;
1006 } /* cypress_ioctl */
1007
1008
1009 static void cypress_set_termios (struct usb_serial_port *port,
1010                 struct ktermios *old_termios)
1011 {
1012         struct cypress_private *priv = usb_get_serial_port_data(port);
1013         struct tty_struct *tty;
1014         int data_bits, stop_bits, parity_type, parity_enable;
1015         unsigned cflag, iflag, baud_mask;
1016         unsigned long flags;
1017         __u8 oldlines;
1018         int linechange = 0;
1019
1020         dbg("%s - port %d", __FUNCTION__, port->number);
1021
1022         tty = port->tty;
1023         if ((!tty) || (!tty->termios)) {
1024                 dbg("%s - no tty structures", __FUNCTION__);
1025                 return;
1026         }
1027
1028         spin_lock_irqsave(&priv->lock, flags);
1029         if (!priv->termios_initialized) {
1030                 if (priv->chiptype == CT_EARTHMATE) {
1031                         *(tty->termios) = tty_std_termios;
1032                         tty->termios->c_cflag = B4800 | CS8 | CREAD | HUPCL |
1033                                 CLOCAL;
1034                 } else if (priv->chiptype == CT_CYPHIDCOM) {
1035                         *(tty->termios) = tty_std_termios;
1036                         tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
1037                                 CLOCAL;
1038                 } else if (priv->chiptype == CT_CA42V2) {
1039                         *(tty->termios) = tty_std_termios;
1040                         tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL |
1041                                 CLOCAL;
1042                 }
1043                 priv->termios_initialized = 1;
1044         }
1045         spin_unlock_irqrestore(&priv->lock, flags);
1046
1047         cflag = tty->termios->c_cflag;
1048         iflag = tty->termios->c_iflag;
1049
1050         /* check if there are new settings */
1051         if (old_termios) {
1052                 if ((cflag != old_termios->c_cflag) ||
1053                         (RELEVANT_IFLAG(iflag) !=
1054                          RELEVANT_IFLAG(old_termios->c_iflag))) {
1055                         dbg("%s - attempting to set new termios settings",
1056                                         __FUNCTION__);
1057                         /* should make a copy of this in case something goes
1058                          * wrong in the function, we can restore it */
1059                         spin_lock_irqsave(&priv->lock, flags);
1060                         priv->tmp_termios = *(tty->termios);
1061                         spin_unlock_irqrestore(&priv->lock, flags);
1062                 } else {
1063                         dbg("%s - nothing to do, exiting", __FUNCTION__);
1064                         return;
1065                 }
1066         } else
1067                 return;
1068
1069         /* set number of data bits, parity, stop bits */
1070         /* when parity is disabled the parity type bit is ignored */
1071
1072         /* 1 means 2 stop bits, 0 means 1 stop bit */
1073         stop_bits = cflag & CSTOPB ? 1 : 0;
1074
1075         if (cflag & PARENB) {
1076                 parity_enable = 1;
1077                 /* 1 means odd parity, 0 means even parity */
1078                 parity_type = cflag & PARODD ? 1 : 0;
1079         } else
1080                 parity_enable = parity_type = 0;
1081
1082         if (cflag & CSIZE) {
1083                 switch (cflag & CSIZE) {
1084                         case CS5:
1085                                 data_bits = 0;
1086                                 break;
1087                         case CS6:
1088                                 data_bits = 1;
1089                                 break;
1090                         case CS7:
1091                                 data_bits = 2;
1092                                 break;
1093                         case CS8:
1094                                 data_bits = 3;
1095                                 break;
1096                         default:
1097                                 err("%s - CSIZE was set, but not CS5-CS8",
1098                                                 __FUNCTION__);
1099                                 data_bits = 3;
1100                 }
1101         } else
1102                 data_bits = 3;
1103
1104         spin_lock_irqsave(&priv->lock, flags);
1105         oldlines = priv->line_control;
1106         if ((cflag & CBAUD) == B0) {
1107                 /* drop dtr and rts */
1108                 dbg("%s - dropping the lines, baud rate 0bps", __FUNCTION__);
1109                 baud_mask = B0;
1110                 priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
1111         } else {
1112                 baud_mask = (cflag & CBAUD);
1113                 switch(baud_mask) {
1114                         case B300:
1115                                 dbg("%s - setting baud 300bps", __FUNCTION__);
1116                                 break;
1117                         case B600:
1118                                 dbg("%s - setting baud 600bps", __FUNCTION__);
1119                                 break;
1120                         case B1200:
1121                                 dbg("%s - setting baud 1200bps", __FUNCTION__);
1122                                 break;
1123                         case B2400:
1124                                 dbg("%s - setting baud 2400bps", __FUNCTION__);
1125                                 break;
1126                         case B4800:
1127                                 dbg("%s - setting baud 4800bps", __FUNCTION__);
1128                                 break;
1129                         case B9600:
1130                                 dbg("%s - setting baud 9600bps", __FUNCTION__);
1131                                 break;
1132                         case B19200:
1133                                 dbg("%s - setting baud 19200bps", __FUNCTION__);
1134                                 break;
1135                         case B38400:
1136                                 dbg("%s - setting baud 38400bps", __FUNCTION__);
1137                                 break;
1138                         case B57600:
1139                                 dbg("%s - setting baud 57600bps", __FUNCTION__);
1140                                 break;
1141                         case B115200:
1142                                 dbg("%s - setting baud 115200bps", __FUNCTION__);
1143                                 break;
1144                         default:
1145                                 dbg("%s - unknown masked baud rate", __FUNCTION__);
1146                 }
1147                 priv->line_control = (CONTROL_DTR | CONTROL_RTS);
1148         }
1149         spin_unlock_irqrestore(&priv->lock, flags);
1150
1151         dbg("%s - sending %d stop_bits, %d parity_enable, %d parity_type, "
1152                         "%d data_bits (+5)", __FUNCTION__, stop_bits,
1153                         parity_enable, parity_type, data_bits);
1154
1155         cypress_serial_control(port, baud_mask, data_bits, stop_bits,
1156                         parity_enable, parity_type, 0, CYPRESS_SET_CONFIG);
1157
1158         /* we perform a CYPRESS_GET_CONFIG so that the current settings are
1159          * filled into the private structure this should confirm that all is
1160          * working if it returns what we just set */
1161         cypress_serial_control(port, 0, 0, 0, 0, 0, 0, CYPRESS_GET_CONFIG);
1162
1163         /* Here we can define custom tty settings for devices; the main tty
1164          * termios flag base comes from empeg.c */
1165
1166         spin_lock_irqsave(&priv->lock, flags);
1167         if ( (priv->chiptype == CT_EARTHMATE) && (priv->baud_rate == 4800) ) {
1168                 dbg("Using custom termios settings for a baud rate of "
1169                                 "4800bps.");
1170                 /* define custom termios settings for NMEA protocol */
1171
1172                 tty->termios->c_iflag /* input modes - */
1173                         &= ~(IGNBRK  /* disable ignore break */
1174                         | BRKINT     /* disable break causes interrupt */
1175                         | PARMRK     /* disable mark parity errors */
1176                         | ISTRIP     /* disable clear high bit of input char */
1177                         | INLCR      /* disable translate NL to CR */
1178                         | IGNCR      /* disable ignore CR */
1179                         | ICRNL      /* disable translate CR to NL */
1180                         | IXON);     /* disable enable XON/XOFF flow control */
1181
1182                 tty->termios->c_oflag /* output modes */
1183                         &= ~OPOST;    /* disable postprocess output char */
1184
1185                 tty->termios->c_lflag /* line discipline modes */
1186                         &= ~(ECHO     /* disable echo input characters */
1187                         | ECHONL      /* disable echo new line */
1188                         | ICANON      /* disable erase, kill, werase, and rprnt
1189                                          special characters */
1190                         | ISIG        /* disable interrupt, quit, and suspend
1191                                          special characters */
1192                         | IEXTEN);    /* disable non-POSIX special characters */
1193         } /* CT_CYPHIDCOM: Application should handle this for device */
1194
1195         linechange = (priv->line_control != oldlines);
1196         spin_unlock_irqrestore(&priv->lock, flags);
1197
1198         /* if necessary, set lines */
1199         if (linechange) {
1200                 priv->cmd_ctrl = 1;
1201                 cypress_write(port, NULL, 0);
1202         }
1203 } /* cypress_set_termios */
1204
1205
1206 /* returns amount of data still left in soft buffer */
1207 static int cypress_chars_in_buffer(struct usb_serial_port *port)
1208 {
1209         struct cypress_private *priv = usb_get_serial_port_data(port);
1210         int chars = 0;
1211         unsigned long flags;
1212
1213         dbg("%s - port %d", __FUNCTION__, port->number);
1214
1215         spin_lock_irqsave(&priv->lock, flags);
1216         chars = cypress_buf_data_avail(priv->buf);
1217         spin_unlock_irqrestore(&priv->lock, flags);
1218
1219         dbg("%s - returns %d", __FUNCTION__, chars);
1220         return chars;
1221 }
1222
1223
1224 static void cypress_throttle (struct usb_serial_port *port)
1225 {
1226         struct cypress_private *priv = usb_get_serial_port_data(port);
1227         unsigned long flags;
1228
1229         dbg("%s - port %d", __FUNCTION__, port->number);
1230
1231         spin_lock_irqsave(&priv->lock, flags);
1232         priv->rx_flags = THROTTLED;
1233         spin_unlock_irqrestore(&priv->lock, flags);
1234 }
1235
1236
1237 static void cypress_unthrottle (struct usb_serial_port *port)
1238 {
1239         struct cypress_private *priv = usb_get_serial_port_data(port);
1240         int actually_throttled, result;
1241         unsigned long flags;
1242
1243         dbg("%s - port %d", __FUNCTION__, port->number);
1244
1245         spin_lock_irqsave(&priv->lock, flags);
1246         actually_throttled = priv->rx_flags & ACTUALLY_THROTTLED;
1247         priv->rx_flags = 0;
1248         spin_unlock_irqrestore(&priv->lock, flags);
1249
1250         if (!priv->comm_is_ok)
1251                 return;
1252
1253         if (actually_throttled) {
1254                 port->interrupt_in_urb->dev = port->serial->dev;
1255
1256                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1257                 if (result) {
1258                         dev_err(&port->dev, "%s - failed submitting read urb, "
1259                                         "error %d\n", __FUNCTION__, result);
1260                         cypress_set_dead(port);
1261                 }
1262         }
1263 }
1264
1265
1266 static void cypress_read_int_callback(struct urb *urb)
1267 {
1268         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1269         struct cypress_private *priv = usb_get_serial_port_data(port);
1270         struct tty_struct *tty;
1271         unsigned char *data = urb->transfer_buffer;
1272         unsigned long flags;
1273         char tty_flag = TTY_NORMAL;
1274         int havedata = 0;
1275         int bytes = 0;
1276         int result;
1277         int i = 0;
1278         int status = urb->status;
1279
1280         dbg("%s - port %d", __FUNCTION__, port->number);
1281
1282         switch (status) {
1283         case 0: /* success */
1284                 break;
1285         case -ECONNRESET:
1286         case -ENOENT:
1287         case -ESHUTDOWN:
1288                 /* precursor to disconnect so just go away */
1289                 return;
1290         case -EPIPE:
1291                 usb_clear_halt(port->serial->dev,0x81);
1292                 break;
1293         default:
1294                 /* something ugly is going on... */
1295                 dev_err(&urb->dev->dev,"%s - unexpected nonzero read status received: %d\n",
1296                         __FUNCTION__, status);
1297                 cypress_set_dead(port);
1298                 return;
1299         }
1300
1301         spin_lock_irqsave(&priv->lock, flags);
1302         if (priv->rx_flags & THROTTLED) {
1303                 dbg("%s - now throttling", __FUNCTION__);
1304                 priv->rx_flags |= ACTUALLY_THROTTLED;
1305                 spin_unlock_irqrestore(&priv->lock, flags);
1306                 return;
1307         }
1308         spin_unlock_irqrestore(&priv->lock, flags);
1309
1310         tty = port->tty;
1311         if (!tty) {
1312                 dbg("%s - bad tty pointer - exiting", __FUNCTION__);
1313                 return;
1314         }
1315
1316         spin_lock_irqsave(&priv->lock, flags);
1317         switch(urb->actual_length) {
1318                 case 32:
1319                         /* This is for the CY7C64013... */
1320                         priv->current_status = data[0] & 0xF8;
1321                         bytes = data[1] + 2;
1322                         i = 2;
1323                         if (bytes > 2)
1324                                 havedata = 1;
1325                         break;
1326                 case 8:
1327                         /* This is for the CY7C63743... */
1328                         priv->current_status = data[0] & 0xF8;
1329                         bytes = (data[0] & 0x07) + 1;
1330                         i = 1;
1331                         if (bytes > 1)
1332                                 havedata = 1;
1333                         break;
1334                 default:
1335                         dbg("%s - wrong packet size - received %d bytes",
1336                                         __FUNCTION__, urb->actual_length);
1337                         spin_unlock_irqrestore(&priv->lock, flags);
1338                         goto continue_read;
1339         }
1340         spin_unlock_irqrestore(&priv->lock, flags);
1341
1342         usb_serial_debug_data (debug, &port->dev, __FUNCTION__,
1343                         urb->actual_length, data);
1344
1345         spin_lock_irqsave(&priv->lock, flags);
1346         /* check to see if status has changed */
1347         if (priv != NULL) {
1348                 if (priv->current_status != priv->prev_status) {
1349                         priv->diff_status |= priv->current_status ^
1350                                 priv->prev_status;
1351                         wake_up_interruptible(&priv->delta_msr_wait);
1352                         priv->prev_status = priv->current_status;
1353                 }
1354         }
1355         spin_unlock_irqrestore(&priv->lock, flags);
1356
1357         /* hangup, as defined in acm.c... this might be a bad place for it
1358          * though */
1359         if (tty && !(tty->termios->c_cflag & CLOCAL) &&
1360                         !(priv->current_status & UART_CD)) {
1361                 dbg("%s - calling hangup", __FUNCTION__);
1362                 tty_hangup(tty);
1363                 goto continue_read;
1364         }
1365
1366         /* There is one error bit... I'm assuming it is a parity error
1367          * indicator as the generic firmware will set this bit to 1 if a
1368          * parity error occurs.
1369          * I can not find reference to any other error events. */
1370         spin_lock_irqsave(&priv->lock, flags);
1371         if (priv->current_status & CYP_ERROR) {
1372                 spin_unlock_irqrestore(&priv->lock, flags);
1373                 tty_flag = TTY_PARITY;
1374                 dbg("%s - Parity Error detected", __FUNCTION__);
1375         } else
1376                 spin_unlock_irqrestore(&priv->lock, flags);
1377
1378         /* process read if there is data other than line status */
1379         if (tty && (bytes > i)) {
1380                 bytes = tty_buffer_request_room(tty, bytes);
1381                 for (; i < bytes ; ++i) {
1382                         dbg("pushing byte number %d - %d - %c", i, data[i],
1383                                         data[i]);
1384                         tty_insert_flip_char(tty, data[i], tty_flag);
1385                 }
1386                 tty_flip_buffer_push(port->tty);
1387         }
1388
1389         spin_lock_irqsave(&priv->lock, flags);
1390         /* control and status byte(s) are also counted */
1391         priv->bytes_in += bytes;
1392         spin_unlock_irqrestore(&priv->lock, flags);
1393
1394 continue_read:
1395
1396         /* Continue trying to always read... unless the port has closed. */
1397
1398         if (port->open_count > 0 && priv->comm_is_ok) {
1399                 usb_fill_int_urb(port->interrupt_in_urb, port->serial->dev,
1400                                 usb_rcvintpipe(port->serial->dev,
1401                                         port->interrupt_in_endpointAddress),
1402                                 port->interrupt_in_urb->transfer_buffer,
1403                                 port->interrupt_in_urb->transfer_buffer_length,
1404                                 cypress_read_int_callback, port, priv->read_urb_interval);
1405                 result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
1406                 if (result) {
1407                         dev_err(&urb->dev->dev, "%s - failed resubmitting "
1408                                         "read urb, error %d\n", __FUNCTION__,
1409                                         result);
1410                         cypress_set_dead(port);
1411                 }
1412         }
1413
1414         return;
1415 } /* cypress_read_int_callback */
1416
1417
1418 static void cypress_write_int_callback(struct urb *urb)
1419 {
1420         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
1421         struct cypress_private *priv = usb_get_serial_port_data(port);
1422         int result;
1423         int status = urb->status;
1424
1425         dbg("%s - port %d", __FUNCTION__, port->number);
1426
1427         switch (status) {
1428                 case 0:
1429                         /* success */
1430                         break;
1431                 case -ECONNRESET:
1432                 case -ENOENT:
1433                 case -ESHUTDOWN:
1434                         /* this urb is terminated, clean up */
1435                         dbg("%s - urb shutting down with status: %d",
1436                             __FUNCTION__, status);
1437                         priv->write_urb_in_use = 0;
1438                         return;
1439                 case -EPIPE: /* no break needed; clear halt and resubmit */
1440                         if (!priv->comm_is_ok)
1441                                 break;
1442                         usb_clear_halt(port->serial->dev, 0x02);
1443                         /* error in the urb, so we have to resubmit it */
1444                         dbg("%s - nonzero write bulk status received: %d",
1445                             __FUNCTION__, status);
1446                         port->interrupt_out_urb->transfer_buffer_length = 1;
1447                         port->interrupt_out_urb->dev = port->serial->dev;
1448                         result = usb_submit_urb(port->interrupt_out_urb, GFP_ATOMIC);
1449                         if (!result)
1450                                 return;
1451                         dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n",
1452                                 __FUNCTION__, result);
1453                         cypress_set_dead(port);
1454                         break;
1455                 default:
1456                         dev_err(&urb->dev->dev,"%s - unexpected nonzero write status received: %d\n",
1457                                 __FUNCTION__, status);
1458                         cypress_set_dead(port);
1459                         break;
1460         }
1461
1462         priv->write_urb_in_use = 0;
1463
1464         /* send any buffered data */
1465         cypress_send(port);
1466 }
1467
1468
1469 /*****************************************************************************
1470  * Write buffer functions - buffering code from pl2303 used
1471  *****************************************************************************/
1472
1473 /*
1474  * cypress_buf_alloc
1475  *
1476  * Allocate a circular buffer and all associated memory.
1477  */
1478
1479 static struct cypress_buf *cypress_buf_alloc(unsigned int size)
1480 {
1481
1482         struct cypress_buf *cb;
1483
1484
1485         if (size == 0)
1486                 return NULL;
1487
1488         cb = kmalloc(sizeof(struct cypress_buf), GFP_KERNEL);
1489         if (cb == NULL)
1490                 return NULL;
1491
1492         cb->buf_buf = kmalloc(size, GFP_KERNEL);
1493         if (cb->buf_buf == NULL) {
1494                 kfree(cb);
1495                 return NULL;
1496         }
1497
1498         cb->buf_size = size;
1499         cb->buf_get = cb->buf_put = cb->buf_buf;
1500
1501         return cb;
1502
1503 }
1504
1505
1506 /*
1507  * cypress_buf_free
1508  *
1509  * Free the buffer and all associated memory.
1510  */
1511
1512 static void cypress_buf_free(struct cypress_buf *cb)
1513 {
1514         if (cb) {
1515                 kfree(cb->buf_buf);
1516                 kfree(cb);
1517         }
1518 }
1519
1520
1521 /*
1522  * cypress_buf_clear
1523  *
1524  * Clear out all data in the circular buffer.
1525  */
1526
1527 static void cypress_buf_clear(struct cypress_buf *cb)
1528 {
1529         if (cb != NULL)
1530                 cb->buf_get = cb->buf_put;
1531                 /* equivalent to a get of all data available */
1532 }
1533
1534
1535 /*
1536  * cypress_buf_data_avail
1537  *
1538  * Return the number of bytes of data available in the circular
1539  * buffer.
1540  */
1541
1542 static unsigned int cypress_buf_data_avail(struct cypress_buf *cb)
1543 {
1544         if (cb != NULL)
1545                 return ((cb->buf_size + cb->buf_put - cb->buf_get) % cb->buf_size);
1546         else
1547                 return 0;
1548 }
1549
1550
1551 /*
1552  * cypress_buf_space_avail
1553  *
1554  * Return the number of bytes of space available in the circular
1555  * buffer.
1556  */
1557
1558 static unsigned int cypress_buf_space_avail(struct cypress_buf *cb)
1559 {
1560         if (cb != NULL)
1561                 return ((cb->buf_size + cb->buf_get - cb->buf_put - 1) % cb->buf_size);
1562         else
1563                 return 0;
1564 }
1565
1566
1567 /*
1568  * cypress_buf_put
1569  *
1570  * Copy data data from a user buffer and put it into the circular buffer.
1571  * Restrict to the amount of space available.
1572  *
1573  * Return the number of bytes copied.
1574  */
1575
1576 static unsigned int cypress_buf_put(struct cypress_buf *cb, const char *buf,
1577         unsigned int count)
1578 {
1579
1580         unsigned int len;
1581
1582
1583         if (cb == NULL)
1584                 return 0;
1585
1586         len  = cypress_buf_space_avail(cb);
1587         if (count > len)
1588                 count = len;
1589
1590         if (count == 0)
1591                 return 0;
1592
1593         len = cb->buf_buf + cb->buf_size - cb->buf_put;
1594         if (count > len) {
1595                 memcpy(cb->buf_put, buf, len);
1596                 memcpy(cb->buf_buf, buf+len, count - len);
1597                 cb->buf_put = cb->buf_buf + count - len;
1598         } else {
1599                 memcpy(cb->buf_put, buf, count);
1600                 if (count < len)
1601                         cb->buf_put += count;
1602                 else /* count == len */
1603                         cb->buf_put = cb->buf_buf;
1604         }
1605
1606         return count;
1607
1608 }
1609
1610
1611 /*
1612  * cypress_buf_get
1613  *
1614  * Get data from the circular buffer and copy to the given buffer.
1615  * Restrict to the amount of data available.
1616  *
1617  * Return the number of bytes copied.
1618  */
1619
1620 static unsigned int cypress_buf_get(struct cypress_buf *cb, char *buf,
1621         unsigned int count)
1622 {
1623
1624         unsigned int len;
1625
1626
1627         if (cb == NULL)
1628                 return 0;
1629
1630         len = cypress_buf_data_avail(cb);
1631         if (count > len)
1632                 count = len;
1633
1634         if (count == 0)
1635                 return 0;
1636
1637         len = cb->buf_buf + cb->buf_size - cb->buf_get;
1638         if (count > len) {
1639                 memcpy(buf, cb->buf_get, len);
1640                 memcpy(buf+len, cb->buf_buf, count - len);
1641                 cb->buf_get = cb->buf_buf + count - len;
1642         } else {
1643                 memcpy(buf, cb->buf_get, count);
1644                 if (count < len)
1645                         cb->buf_get += count;
1646                 else /* count == len */
1647                         cb->buf_get = cb->buf_buf;
1648         }
1649
1650         return count;
1651
1652 }
1653
1654 /*****************************************************************************
1655  * Module functions
1656  *****************************************************************************/
1657
1658 static int __init cypress_init(void)
1659 {
1660         int retval;
1661
1662         dbg("%s", __FUNCTION__);
1663
1664         retval = usb_serial_register(&cypress_earthmate_device);
1665         if (retval)
1666                 goto failed_em_register;
1667         retval = usb_serial_register(&cypress_hidcom_device);
1668         if (retval)
1669                 goto failed_hidcom_register;
1670         retval = usb_serial_register(&cypress_ca42v2_device);
1671         if (retval)
1672                 goto failed_ca42v2_register;
1673         retval = usb_register(&cypress_driver);
1674         if (retval)
1675                 goto failed_usb_register;
1676
1677         info(DRIVER_DESC " " DRIVER_VERSION);
1678         return 0;
1679
1680 failed_usb_register:
1681         usb_serial_deregister(&cypress_ca42v2_device);
1682 failed_ca42v2_register:
1683         usb_serial_deregister(&cypress_hidcom_device);
1684 failed_hidcom_register:
1685         usb_serial_deregister(&cypress_earthmate_device);
1686 failed_em_register:
1687         return retval;
1688 }
1689
1690
1691 static void __exit cypress_exit (void)
1692 {
1693         dbg("%s", __FUNCTION__);
1694
1695         usb_deregister (&cypress_driver);
1696         usb_serial_deregister (&cypress_earthmate_device);
1697         usb_serial_deregister (&cypress_hidcom_device);
1698         usb_serial_deregister (&cypress_ca42v2_device);
1699 }
1700
1701
1702 module_init(cypress_init);
1703 module_exit(cypress_exit);
1704
1705 MODULE_AUTHOR( DRIVER_AUTHOR );
1706 MODULE_DESCRIPTION( DRIVER_DESC );
1707 MODULE_VERSION( DRIVER_VERSION );
1708 MODULE_LICENSE("GPL");
1709
1710 module_param(debug, bool, S_IRUGO | S_IWUSR);
1711 MODULE_PARM_DESC(debug, "Debug enabled or not");
1712 module_param(stats, bool, S_IRUGO | S_IWUSR);
1713 MODULE_PARM_DESC(stats, "Enable statistics or not");
1714 module_param(interval, int, S_IRUGO | S_IWUSR);
1715 MODULE_PARM_DESC(interval, "Overrides interrupt interval");