git.oblomov.eu Git - linux-2.6/blob - drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/serial.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/serial.h>
  36 #include <linux/uaccess.h>
  37
  38 /*
  39  * Version Information
  40  */
  41 #define DRIVER_VERSION "1.3.2"
  42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  43
  44 /*
  45  * 16C50 UART register defines
  46  */
  47
  48 #define LCR_BITS_5             0x00     /* 5 bits/char */
  49 #define LCR_BITS_6             0x01     /* 6 bits/char */
  50 #define LCR_BITS_7             0x02     /* 7 bits/char */
  51 #define LCR_BITS_8             0x03     /* 8 bits/char */
  52 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  53
  54 #define LCR_STOP_1             0x00     /* 1 stop bit */
  55 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  56 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  57 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  58
  59 #define LCR_PAR_NONE           0x00     /* No parity */
  60 #define LCR_PAR_ODD            0x08     /* Odd parity */
  61 #define LCR_PAR_EVEN           0x18     /* Even parity */
  62 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  63 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  64 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  65
  66 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  67 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  68
  69 #define MCR_DTR                0x01     /* Assert DTR */
  70 #define MCR_RTS                0x02     /* Assert RTS */
  71 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  72 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  73 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  74 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  75
  76 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  77 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  78 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  79 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  80
  81 /*
  82  * Defines used for sending commands to port
  83  */
  84
  85 #define WAIT_FOR_EVER   (HZ * 0)        /* timeout urb is wait for ever */
  86 #define MOS_WDR_TIMEOUT (HZ * 5)        /* default urb timeout */
  87
  88 #define MOS_PORT1       0x0200
  89 #define MOS_PORT2       0x0300
  90 #define MOS_VENREG      0x0000
  91 #define MOS_MAX_PORT    0x02
  92 #define MOS_WRITE       0x0E
  93 #define MOS_READ        0x0D
  94
  95 /* Requests */
  96 #define MCS_RD_RTYPE    0xC0
  97 #define MCS_WR_RTYPE    0x40
  98 #define MCS_RDREQ       0x0D
  99 #define MCS_WRREQ       0x0E
 100 #define MCS_CTRL_TIMEOUT        500
 101 #define VENDOR_READ_LENGTH      (0x01)
 102
 103 #define MAX_NAME_LEN    64
 104
 105 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 106 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 107
 108 /* For higher baud Rates use TIOCEXBAUD */
 109 #define TIOCEXBAUD     0x5462
 110
 111 /* vendor id and device id defines */
 112
 113 /* The native mos7840/7820 component */
 114 #define USB_VENDOR_ID_MOSCHIP           0x9710
 115 #define MOSCHIP_DEVICE_ID_7840          0x7840
 116 #define MOSCHIP_DEVICE_ID_7820          0x7820
 117 /* The native component can have its vendor/device id's overridden
 118  * in vendor-specific implementations.  Such devices can be handled
 119  * by making a change here, in moschip_port_id_table, and in
 120  * moschip_id_table_combined
 121  */
 122 #define USB_VENDOR_ID_BANDB             0x0856
 123 #define BANDB_DEVICE_ID_USOPTL4_4       0xAC44
 124 #define BANDB_DEVICE_ID_USOPTL4_2       0xAC42
 125
 126 /* This driver also supports the ATEN UC2324 device since it is mos7840 based
 127  *  - if I knew the device id it would also support the ATEN UC2322 */
 128 #define USB_VENDOR_ID_ATENINTL          0x0557
 129 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 130
 131 /* Interrupt Routine Defines    */
 132
 133 #define SERIAL_IIR_RLS      0x06
 134 #define SERIAL_IIR_MS       0x00
 135
 136 /*
 137  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 138  */
 139 #define SERIAL_LSR_DR       0x0001
 140 #define SERIAL_LSR_OE       0x0002
 141 #define SERIAL_LSR_PE       0x0004
 142 #define SERIAL_LSR_FE       0x0008
 143 #define SERIAL_LSR_BI       0x0010
 144
 145 #define MOS_MSR_DELTA_CTS   0x10
 146 #define MOS_MSR_DELTA_DSR   0x20
 147 #define MOS_MSR_DELTA_RI    0x40
 148 #define MOS_MSR_DELTA_CD    0x80
 149
 150 /* Serial Port register Address */
 151 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 152 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 153 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 154 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 155 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 156 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 157 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 158 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 159 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 160
 161 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 162 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 163
 164 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 165
 166 /*
 167  * URB POOL related defines
 168  */
 169 #define NUM_URBS                        16      /* URB Count */
 170 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 171
 172
 173 static struct usb_device_id moschip_port_id_table[] = {
 174         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 175         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 176         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 177         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 178         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 179         {}                      /* terminating entry */
 180 };
 181
 182 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
 183         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 184         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 185         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 186         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 187         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 188         {}                      /* terminating entry */
 189 };
 190
 191 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 192
 193 /* This structure holds all of the local port information */
 194
 195 struct moschip_port {
 196         int port_num;           /*Actual port number in the device(1,2,etc) */
 197         struct urb *write_urb;  /* write URB for this port */
 198         struct urb *read_urb;   /* read URB for this port */
 199         struct urb *int_urb;
 200         __u8 shadowLCR;         /* last LCR value received */
 201         __u8 shadowMCR;         /* last MCR value received */
 202         char open;
 203         char open_ports;
 204         char zombie;
 205         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 206         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 207         int delta_msr_cond;
 208         struct async_icount icount;
 209         struct usb_serial_port *port;   /* loop back to the owner of this object */
 210
 211         /* Offsets */
 212         __u8 SpRegOffset;
 213         __u8 ControlRegOffset;
 214         __u8 DcrRegOffset;
 215         /* for processing control URBS in interrupt context */
 216         struct urb *control_urb;
 217         struct usb_ctrlrequest *dr;
 218         char *ctrl_buf;
 219         int MsrLsr;
 220
 221         spinlock_t pool_lock;
 222         struct urb *write_urb_pool[NUM_URBS];
 223         char busy[NUM_URBS];
 224         bool read_urb_busy;
 225 };
 226
 227
 228 static int debug;
 229
 230 /*
 231  * mos7840_set_reg_sync
 232  *      To set the Control register by calling usb_fill_control_urb function
 233  *      by passing usb_sndctrlpipe function as parameter.
 234  */
 235
 236 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 237                                 __u16 val)
 238 {
 239         struct usb_device *dev = port->serial->dev;
 240         val = val & 0x00ff;
 241         dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
 242
 243         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 244                                MCS_WR_RTYPE, val, reg, NULL, 0,
 245                                MOS_WDR_TIMEOUT);
 246 }
 247
 248 /*
 249  * mos7840_get_reg_sync
 250  *      To set the Uart register by calling usb_fill_control_urb function by
 251  *      passing usb_rcvctrlpipe function as parameter.
 252  */
 253
 254 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 255                                 __u16 *val)
 256 {
 257         struct usb_device *dev = port->serial->dev;
 258         int ret = 0;
 259
 260         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 261                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
 262                               MOS_WDR_TIMEOUT);
 263         dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
 264         *val = (*val) & 0x00ff;
 265         return ret;
 266 }
 267
 268 /*
 269  * mos7840_set_uart_reg
 270  *      To set the Uart register by calling usb_fill_control_urb function by
 271  *      passing usb_sndctrlpipe function as parameter.
 272  */
 273
 274 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 275                                 __u16 val)
 276 {
 277
 278         struct usb_device *dev = port->serial->dev;
 279         val = val & 0x00ff;
 280         /* For the UART control registers, the application number need
 281            to be Or'ed */
 282         if (port->serial->num_ports == 4) {
 283                 val |= (((__u16) port->number -
 284                                 (__u16) (port->serial->minor)) + 1) << 8;
 285                 dbg("mos7840_set_uart_reg application number is %x", val);
 286         } else {
 287                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 288                         val |= (((__u16) port->number -
 289                               (__u16) (port->serial->minor)) + 1) << 8;
 290                         dbg("mos7840_set_uart_reg application number is %x",
 291                             val);
 292                 } else {
 293                         val |=
 294                             (((__u16) port->number -
 295                               (__u16) (port->serial->minor)) + 2) << 8;
 296                         dbg("mos7840_set_uart_reg application number is %x",
 297                             val);
 298                 }
 299         }
 300         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 301                                MCS_WR_RTYPE, val, reg, NULL, 0,
 302                                MOS_WDR_TIMEOUT);
 303
 304 }
 305
 306 /*
 307  * mos7840_get_uart_reg
 308  *      To set the Control register by calling usb_fill_control_urb function
 309  *      by passing usb_rcvctrlpipe function as parameter.
 310  */
 311 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 312                                 __u16 *val)
 313 {
 314         struct usb_device *dev = port->serial->dev;
 315         int ret = 0;
 316         __u16 Wval;
 317
 318         /* dbg("application number is %4x",
 319             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 320         /* Wval  is same as application number */
 321         if (port->serial->num_ports == 4) {
 322                 Wval =
 323                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 324                      1) << 8;
 325                 dbg("mos7840_get_uart_reg application number is %x", Wval);
 326         } else {
 327                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 328                         Wval = (((__u16) port->number -
 329                               (__u16) (port->serial->minor)) + 1) << 8;
 330                         dbg("mos7840_get_uart_reg application number is %x",
 331                             Wval);
 332                 } else {
 333                         Wval = (((__u16) port->number -
 334                               (__u16) (port->serial->minor)) + 2) << 8;
 335                         dbg("mos7840_get_uart_reg application number is %x",
 336                             Wval);
 337                 }
 338         }
 339         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 340                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 341                               MOS_WDR_TIMEOUT);
 342         *val = (*val) & 0x00ff;
 343         return ret;
 344 }
 345
 346 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 347 {
 348
 349         dbg("***************************************");
 350         dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
 351         dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
 352         dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
 353         dbg("***************************************");
 354
 355 }
 356
 357 /************************************************************************/
 358 /************************************************************************/
 359 /*             I N T E R F A C E   F U N C T I O N S                    */
 360 /*             I N T E R F A C E   F U N C T I O N S                    */
 361 /************************************************************************/
 362 /************************************************************************/
 363
 364 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 365                                             struct moschip_port *data)
 366 {
 367         usb_set_serial_port_data(port, (void *)data);
 368 }
 369
 370 static inline struct moschip_port *mos7840_get_port_private(struct
 371                                                             usb_serial_port
 372                                                             *port)
 373 {
 374         return (struct moschip_port *)usb_get_serial_port_data(port);
 375 }
 376
 377 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 378 {
 379         struct moschip_port *mos7840_port;
 380         struct async_icount *icount;
 381         mos7840_port = port;
 382         icount = &mos7840_port->icount;
 383         if (new_msr &
 384             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 385              MOS_MSR_DELTA_CD)) {
 386                 icount = &mos7840_port->icount;
 387
 388                 /* update input line counters */
 389                 if (new_msr & MOS_MSR_DELTA_CTS) {
 390                         icount->cts++;
 391                         smp_wmb();
 392                 }
 393                 if (new_msr & MOS_MSR_DELTA_DSR) {
 394                         icount->dsr++;
 395                         smp_wmb();
 396                 }
 397                 if (new_msr & MOS_MSR_DELTA_CD) {
 398                         icount->dcd++;
 399                         smp_wmb();
 400                 }
 401                 if (new_msr & MOS_MSR_DELTA_RI) {
 402                         icount->rng++;
 403                         smp_wmb();
 404                 }
 405         }
 406 }
 407
 408 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 409 {
 410         struct async_icount *icount;
 411
 412         dbg("%s - %02x", __func__, new_lsr);
 413
 414         if (new_lsr & SERIAL_LSR_BI) {
 415                 /*
 416                  * Parity and Framing errors only count if they
 417                  * occur exclusive of a break being
 418                  * received.
 419                  */
 420                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 421         }
 422
 423         /* update input line counters */
 424         icount = &port->icount;
 425         if (new_lsr & SERIAL_LSR_BI) {
 426                 icount->brk++;
 427                 smp_wmb();
 428         }
 429         if (new_lsr & SERIAL_LSR_OE) {
 430                 icount->overrun++;
 431                 smp_wmb();
 432         }
 433         if (new_lsr & SERIAL_LSR_PE) {
 434                 icount->parity++;
 435                 smp_wmb();
 436         }
 437         if (new_lsr & SERIAL_LSR_FE) {
 438                 icount->frame++;
 439                 smp_wmb();
 440         }
 441 }
 442
 443 /************************************************************************/
 444 /************************************************************************/
 445 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 446 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 447 /************************************************************************/
 448 /************************************************************************/
 449
 450 static void mos7840_control_callback(struct urb *urb)
 451 {
 452         unsigned char *data;
 453         struct moschip_port *mos7840_port;
 454         __u8 regval = 0x0;
 455         int result = 0;
 456         int status = urb->status;
 457
 458         mos7840_port = urb->context;
 459
 460         switch (status) {
 461         case 0:
 462                 /* success */
 463                 break;
 464         case -ECONNRESET:
 465         case -ENOENT:
 466         case -ESHUTDOWN:
 467                 /* this urb is terminated, clean up */
 468                 dbg("%s - urb shutting down with status: %d", __func__,
 469                     status);
 470                 return;
 471         default:
 472                 dbg("%s - nonzero urb status received: %d", __func__,
 473                     status);
 474                 goto exit;
 475         }
 476
 477         dbg("%s urb buffer size is %d", __func__, urb->actual_length);
 478         dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
 479             mos7840_port->MsrLsr, mos7840_port->port_num);
 480         data = urb->transfer_buffer;
 481         regval = (__u8) data[0];
 482         dbg("%s data is %x", __func__, regval);
 483         if (mos7840_port->MsrLsr == 0)
 484                 mos7840_handle_new_msr(mos7840_port, regval);
 485         else if (mos7840_port->MsrLsr == 1)
 486                 mos7840_handle_new_lsr(mos7840_port, regval);
 487
 488 exit:
 489         spin_lock(&mos7840_port->pool_lock);
 490         if (!mos7840_port->zombie)
 491                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 492         spin_unlock(&mos7840_port->pool_lock);
 493         if (result) {
 494                 dev_err(&urb->dev->dev,
 495                         "%s - Error %d submitting interrupt urb\n",
 496                         __func__, result);
 497         }
 498 }
 499
 500 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 501                            __u16 *val)
 502 {
 503         struct usb_device *dev = mcs->port->serial->dev;
 504         struct usb_ctrlrequest *dr = mcs->dr;
 505         unsigned char *buffer = mcs->ctrl_buf;
 506         int ret;
 507
 508         dr->bRequestType = MCS_RD_RTYPE;
 509         dr->bRequest = MCS_RDREQ;
 510         dr->wValue = cpu_to_le16(Wval); /* 0 */
 511         dr->wIndex = cpu_to_le16(reg);
 512         dr->wLength = cpu_to_le16(2);
 513
 514         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 515                              (unsigned char *)dr, buffer, 2,
 516                              mos7840_control_callback, mcs);
 517         mcs->control_urb->transfer_buffer_length = 2;
 518         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 519         return ret;
 520 }
 521
 522 /*****************************************************************************
 523  * mos7840_interrupt_callback
 524  *      this is the callback function for when we have received data on the
 525  *      interrupt endpoint.
 526  *****************************************************************************/
 527
 528 static void mos7840_interrupt_callback(struct urb *urb)
 529 {
 530         int result;
 531         int length;
 532         struct moschip_port *mos7840_port;
 533         struct usb_serial *serial;
 534         __u16 Data;
 535         unsigned char *data;
 536         __u8 sp[5], st;
 537         int i, rv = 0;
 538         __u16 wval, wreg = 0;
 539         int status = urb->status;
 540
 541         dbg("%s", " : Entering");
 542
 543         switch (status) {
 544         case 0:
 545                 /* success */
 546                 break;
 547         case -ECONNRESET:
 548         case -ENOENT:
 549         case -ESHUTDOWN:
 550                 /* this urb is terminated, clean up */
 551                 dbg("%s - urb shutting down with status: %d", __func__,
 552                     status);
 553                 return;
 554         default:
 555                 dbg("%s - nonzero urb status received: %d", __func__,
 556                     status);
 557                 goto exit;
 558         }
 559
 560         length = urb->actual_length;
 561         data = urb->transfer_buffer;
 562
 563         serial = urb->context;
 564
 565         /* Moschip get 5 bytes
 566          * Byte 1 IIR Port 1 (port.number is 0)
 567          * Byte 2 IIR Port 2 (port.number is 1)
 568          * Byte 3 IIR Port 3 (port.number is 2)
 569          * Byte 4 IIR Port 4 (port.number is 3)
 570          * Byte 5 FIFO status for both */
 571
 572         if (length && length > 5) {
 573                 dbg("%s", "Wrong data !!!");
 574                 return;
 575         }
 576
 577         sp[0] = (__u8) data[0];
 578         sp[1] = (__u8) data[1];
 579         sp[2] = (__u8) data[2];
 580         sp[3] = (__u8) data[3];
 581         st = (__u8) data[4];
 582
 583         for (i = 0; i < serial->num_ports; i++) {
 584                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 585                 wval =
 586                     (((__u16) serial->port[i]->number -
 587                       (__u16) (serial->minor)) + 1) << 8;
 588                 if (mos7840_port->open) {
 589                         if (sp[i] & 0x01) {
 590                                 dbg("SP%d No Interrupt !!!", i);
 591                         } else {
 592                                 switch (sp[i] & 0x0f) {
 593                                 case SERIAL_IIR_RLS:
 594                                         dbg("Serial Port %d: Receiver status error or ", i);
 595                                         dbg("address bit detected in 9-bit mode");
 596                                         mos7840_port->MsrLsr = 1;
 597                                         wreg = LINE_STATUS_REGISTER;
 598                                         break;
 599                                 case SERIAL_IIR_MS:
 600                                         dbg("Serial Port %d: Modem status change", i);
 601                                         mos7840_port->MsrLsr = 0;
 602                                         wreg = MODEM_STATUS_REGISTER;
 603                                         break;
 604                                 }
 605                                 spin_lock(&mos7840_port->pool_lock);
 606                                 if (!mos7840_port->zombie) {
 607                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 608                                 } else {
 609                                         spin_unlock(&mos7840_port->pool_lock);
 610                                         return;
 611                                 }
 612                                 spin_unlock(&mos7840_port->pool_lock);
 613                         }
 614                 }
 615         }
 616         if (!(rv < 0))
 617                 /* the completion handler for the control urb will resubmit */
 618                 return;
 619 exit:
 620         result = usb_submit_urb(urb, GFP_ATOMIC);
 621         if (result) {
 622                 dev_err(&urb->dev->dev,
 623                         "%s - Error %d submitting interrupt urb\n",
 624                         __func__, result);
 625         }
 626 }
 627
 628 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 629                                        const char *function)
 630 {
 631         if (!port) {
 632                 dbg("%s - port == NULL", function);
 633                 return -1;
 634         }
 635         if (!port->serial) {
 636                 dbg("%s - port->serial == NULL", function);
 637                 return -1;
 638         }
 639
 640         return 0;
 641 }
 642
 643 /* Inline functions to check the sanity of a pointer that is passed to us */
 644 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 645                                          const char *function)
 646 {
 647         if (!serial) {
 648                 dbg("%s - serial == NULL", function);
 649                 return -1;
 650         }
 651         if (!serial->type) {
 652                 dbg("%s - serial->type == NULL!", function);
 653                 return -1;
 654         }
 655
 656         return 0;
 657 }
 658
 659 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 660                                                  const char *function)
 661 {
 662         /* if no port was specified, or it fails a paranoia check */
 663         if (!port ||
 664             mos7840_port_paranoia_check(port, function) ||
 665             mos7840_serial_paranoia_check(port->serial, function)) {
 666                 /* then say that we don't have a valid usb_serial thing,
 667                  * which will end up genrating -ENODEV return values */
 668                 return NULL;
 669         }
 670
 671         return port->serial;
 672 }
 673
 674 /*****************************************************************************
 675  * mos7840_bulk_in_callback
 676  *      this is the callback function for when we have received data on the
 677  *      bulk in endpoint.
 678  *****************************************************************************/
 679
 680 static void mos7840_bulk_in_callback(struct urb *urb)
 681 {
 682         int retval;
 683         unsigned char *data;
 684         struct usb_serial *serial;
 685         struct usb_serial_port *port;
 686         struct moschip_port *mos7840_port;
 687         struct tty_struct *tty;
 688         int status = urb->status;
 689
 690         mos7840_port = urb->context;
 691         if (!mos7840_port) {
 692                 dbg("%s", "NULL mos7840_port pointer");
 693                 mos7840_port->read_urb_busy = false;
 694                 return;
 695         }
 696
 697         if (status) {
 698                 dbg("nonzero read bulk status received: %d", status);
 699                 mos7840_port->read_urb_busy = false;
 700                 return;
 701         }
 702
 703         port = (struct usb_serial_port *)mos7840_port->port;
 704         if (mos7840_port_paranoia_check(port, __func__)) {
 705                 dbg("%s", "Port Paranoia failed");
 706                 mos7840_port->read_urb_busy = false;
 707                 return;
 708         }
 709
 710         serial = mos7840_get_usb_serial(port, __func__);
 711         if (!serial) {
 712                 dbg("%s", "Bad serial pointer");
 713                 mos7840_port->read_urb_busy = false;
 714                 return;
 715         }
 716
 717         dbg("%s", "Entering... ");
 718
 719         data = urb->transfer_buffer;
 720
 721         dbg("%s", "Entering ...........");
 722
 723         if (urb->actual_length) {
 724                 tty = tty_port_tty_get(&mos7840_port->port->port);
 725                 if (tty) {
 726                         tty_buffer_request_room(tty, urb->actual_length);
 727                         tty_insert_flip_string(tty, data, urb->actual_length);
 728                         dbg(" %s ", data);
 729                         tty_flip_buffer_push(tty);
 730                         tty_kref_put(tty);
 731                 }
 732                 mos7840_port->icount.rx += urb->actual_length;
 733                 smp_wmb();
 734                 dbg("mos7840_port->icount.rx is %d:",
 735                     mos7840_port->icount.rx);
 736         }
 737
 738         if (!mos7840_port->read_urb) {
 739                 dbg("%s", "URB KILLED !!!");
 740                 mos7840_port->read_urb_busy = false;
 741                 return;
 742         }
 743
 744
 745         mos7840_port->read_urb->dev = serial->dev;
 746
 747         mos7840_port->read_urb_busy = true;
 748         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 749
 750         if (retval) {
 751                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 752                 mos7840_port->read_urb_busy = false;
 753         }
 754 }
 755
 756 /*****************************************************************************
 757  * mos7840_bulk_out_data_callback
 758  *      this is the callback function for when we have finished sending
 759  *      serial data on the bulk out endpoint.
 760  *****************************************************************************/
 761
 762 static void mos7840_bulk_out_data_callback(struct urb *urb)
 763 {
 764         struct moschip_port *mos7840_port;
 765         struct tty_struct *tty;
 766         int status = urb->status;
 767         int i;
 768
 769         mos7840_port = urb->context;
 770         spin_lock(&mos7840_port->pool_lock);
 771         for (i = 0; i < NUM_URBS; i++) {
 772                 if (urb == mos7840_port->write_urb_pool[i]) {
 773                         mos7840_port->busy[i] = 0;
 774                         break;
 775                 }
 776         }
 777         spin_unlock(&mos7840_port->pool_lock);
 778
 779         if (status) {
 780                 dbg("nonzero write bulk status received:%d", status);
 781                 return;
 782         }
 783
 784         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 785                 dbg("%s", "Port Paranoia failed");
 786                 return;
 787         }
 788
 789         dbg("%s", "Entering .........");
 790
 791         tty = tty_port_tty_get(&mos7840_port->port->port);
 792         if (tty && mos7840_port->open)
 793                 tty_wakeup(tty);
 794         tty_kref_put(tty);
 795
 796 }
 797
 798 /************************************************************************/
 799 /*       D R I V E R  T T Y  I N T E R F A C E  F U N C T I O N S       */
 800 /************************************************************************/
 801 #ifdef MCSSerialProbe
 802 static int mos7840_serial_probe(struct usb_serial *serial,
 803                                 const struct usb_device_id *id)
 804 {
 805
 806         /*need to implement the mode_reg reading and updating\
 807            structures usb_serial_ device_type\
 808            (i.e num_ports, num_bulkin,bulkout etc) */
 809         /* Also we can update the changes  attach */
 810         return 1;
 811 }
 812 #endif
 813
 814 /*****************************************************************************
 815  * mos7840_open
 816  *      this function is called by the tty driver when a port is opened
 817  *      If successful, we return 0
 818  *      Otherwise we return a negative error number.
 819  *****************************************************************************/
 820
 821 static int mos7840_open(struct tty_struct *tty,
 822                         struct usb_serial_port *port, struct file *filp)
 823 {
 824         int response;
 825         int j;
 826         struct usb_serial *serial;
 827         struct urb *urb;
 828         __u16 Data;
 829         int status;
 830         struct moschip_port *mos7840_port;
 831         struct moschip_port *port0;
 832
 833         dbg ("%s enter", __func__);
 834
 835         if (mos7840_port_paranoia_check(port, __func__)) {
 836                 dbg("%s", "Port Paranoia failed");
 837                 return -ENODEV;
 838         }
 839
 840         serial = port->serial;
 841
 842         if (mos7840_serial_paranoia_check(serial, __func__)) {
 843                 dbg("%s", "Serial Paranoia failed");
 844                 return -ENODEV;
 845         }
 846
 847         mos7840_port = mos7840_get_port_private(port);
 848         port0 = mos7840_get_port_private(serial->port[0]);
 849
 850         if (mos7840_port == NULL || port0 == NULL)
 851                 return -ENODEV;
 852
 853         usb_clear_halt(serial->dev, port->write_urb->pipe);
 854         usb_clear_halt(serial->dev, port->read_urb->pipe);
 855         port0->open_ports++;
 856
 857         /* Initialising the write urb pool */
 858         for (j = 0; j < NUM_URBS; ++j) {
 859                 urb = usb_alloc_urb(0, GFP_KERNEL);
 860                 mos7840_port->write_urb_pool[j] = urb;
 861
 862                 if (urb == NULL) {
 863                         dev_err(&port->dev, "No more urbs???\n");
 864                         continue;
 865                 }
 866
 867                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 868                                                                 GFP_KERNEL);
 869                 if (!urb->transfer_buffer) {
 870                         usb_free_urb(urb);
 871                         mos7840_port->write_urb_pool[j] = NULL;
 872                         dev_err(&port->dev,
 873                                 "%s-out of memory for urb buffers.\n",
 874                                 __func__);
 875                         continue;
 876                 }
 877         }
 878
 879 /*****************************************************************************
 880  * Initialize MCS7840 -- Write Init values to corresponding Registers
 881  *
 882  * Register Index
 883  * 1 : IER
 884  * 2 : FCR
 885  * 3 : LCR
 886  * 4 : MCR
 887  *
 888  * 0x08 : SP1/2 Control Reg
 889  *****************************************************************************/
 890
 891         /* NEED to check the following Block */
 892
 893         Data = 0x0;
 894         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 895         if (status < 0) {
 896                 dbg("Reading Spreg failed");
 897                 return -1;
 898         }
 899         Data |= 0x80;
 900         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 901         if (status < 0) {
 902                 dbg("writing Spreg failed");
 903                 return -1;
 904         }
 905
 906         Data &= ~0x80;
 907         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 908         if (status < 0) {
 909                 dbg("writing Spreg failed");
 910                 return -1;
 911         }
 912         /* End of block to be checked */
 913
 914         Data = 0x0;
 915         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 916                                                                         &Data);
 917         if (status < 0) {
 918                 dbg("Reading Controlreg failed");
 919                 return -1;
 920         }
 921         Data |= 0x08;           /* Driver done bit */
 922         Data |= 0x20;           /* rx_disable */
 923         status = mos7840_set_reg_sync(port,
 924                                 mos7840_port->ControlRegOffset, Data);
 925         if (status < 0) {
 926                 dbg("writing Controlreg failed");
 927                 return -1;
 928         }
 929         /* do register settings here */
 930         /* Set all regs to the device default values. */
 931         /***********************************
 932          * First Disable all interrupts.
 933          ***********************************/
 934         Data = 0x00;
 935         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 936         if (status < 0) {
 937                 dbg("disabling interrupts failed");
 938                 return -1;
 939         }
 940         /* Set FIFO_CONTROL_REGISTER to the default value */
 941         Data = 0x00;
 942         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 943         if (status < 0) {
 944                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 945                 return -1;
 946         }
 947
 948         Data = 0xcf;
 949         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 950         if (status < 0) {
 951                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 952                 return -1;
 953         }
 954
 955         Data = 0x03;
 956         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 957         mos7840_port->shadowLCR = Data;
 958
 959         Data = 0x0b;
 960         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 961         mos7840_port->shadowMCR = Data;
 962
 963         Data = 0x00;
 964         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 965         mos7840_port->shadowLCR = Data;
 966
 967         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 968         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 969
 970         Data = 0x0c;
 971         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 972
 973         Data = 0x0;
 974         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 975
 976         Data = 0x00;
 977         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 978
 979         Data = Data & ~SERIAL_LCR_DLAB;
 980         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 981         mos7840_port->shadowLCR = Data;
 982
 983         /* clearing Bulkin and Bulkout Fifo */
 984         Data = 0x0;
 985         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 986
 987         Data = Data | 0x0c;
 988         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 989
 990         Data = Data & ~0x0c;
 991         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 992         /* Finally enable all interrupts */
 993         Data = 0x0c;
 994         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 995
 996         /* clearing rx_disable */
 997         Data = 0x0;
 998         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 999                                                                         &Data);
1000         Data = Data & ~0x20;
1001         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1002                                                                         Data);
1003
1004         /* rx_negate */
1005         Data = 0x0;
1006         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1007                                                                         &Data);
1008         Data = Data | 0x10;
1009         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1010                                                                         Data);
1011
1012         /* Check to see if we've set up our endpoint info yet    *
1013          * (can't set it up in mos7840_startup as the structures *
1014          * were not set up at that time.)                        */
1015         if (port0->open_ports == 1) {
1016                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1017                         /* set up interrupt urb */
1018                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1019                                 serial->dev,
1020                                 usb_rcvintpipe(serial->dev,
1021                                 serial->port[0]->interrupt_in_endpointAddress),
1022                                 serial->port[0]->interrupt_in_buffer,
1023                                 serial->port[0]->interrupt_in_urb->
1024                                 transfer_buffer_length,
1025                                 mos7840_interrupt_callback,
1026                                 serial,
1027                                 serial->port[0]->interrupt_in_urb->interval);
1028
1029                         /* start interrupt read for mos7840               *
1030                          * will continue as long as mos7840 is connected  */
1031
1032                         response =
1033                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1034                                            GFP_KERNEL);
1035                         if (response) {
1036                                 dev_err(&port->dev, "%s - Error %d submitting "
1037                                         "interrupt urb\n", __func__, response);
1038                         }
1039
1040                 }
1041
1042         }
1043
1044         /* see if we've set up our endpoint info yet   *
1045          * (can't set it up in mos7840_startup as the  *
1046          * structures were not set up at that time.)   */
1047
1048         dbg("port number is %d", port->number);
1049         dbg("serial number is %d", port->serial->minor);
1050         dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1051         dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1052         dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1053         dbg("port's number in the device is %d", mos7840_port->port_num);
1054         mos7840_port->read_urb = port->read_urb;
1055
1056         /* set up our bulk in urb */
1057
1058         usb_fill_bulk_urb(mos7840_port->read_urb,
1059                           serial->dev,
1060                           usb_rcvbulkpipe(serial->dev,
1061                                           port->bulk_in_endpointAddress),
1062                           port->bulk_in_buffer,
1063                           mos7840_port->read_urb->transfer_buffer_length,
1064                           mos7840_bulk_in_callback, mos7840_port);
1065
1066         dbg("mos7840_open: bulkin endpoint is %d",
1067             port->bulk_in_endpointAddress);
1068         mos7840_port->read_urb_busy = true;
1069         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1070         if (response) {
1071                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1072                         __func__, response);
1073                 mos7840_port->read_urb_busy = false;
1074         }
1075
1076         /* initialize our wait queues */
1077         init_waitqueue_head(&mos7840_port->wait_chase);
1078         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1079
1080         /* initialize our icount structure */
1081         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1082
1083         /* initialize our port settings */
1084         /* Must set to enable ints! */
1085         mos7840_port->shadowMCR = MCR_MASTER_IE;
1086         /* send a open port command */
1087         mos7840_port->open = 1;
1088         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1089         mos7840_port->icount.tx = 0;
1090         mos7840_port->icount.rx = 0;
1091
1092         dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
1093                                 serial, mos7840_port, port);
1094
1095         dbg ("%s leave", __func__);
1096
1097         return 0;
1098
1099 }
1100
1101 /*****************************************************************************
1102  * mos7840_chars_in_buffer
1103  *      this function is called by the tty driver when it wants to know how many
1104  *      bytes of data we currently have outstanding in the port (data that has
1105  *      been written, but hasn't made it out the port yet)
1106  *      If successful, we return the number of bytes left to be written in the
1107  *      system,
1108  *      Otherwise we return zero.
1109  *****************************************************************************/
1110
1111 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1112 {
1113         struct usb_serial_port *port = tty->driver_data;
1114         int i;
1115         int chars = 0;
1116         unsigned long flags;
1117         struct moschip_port *mos7840_port;
1118
1119         dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1120
1121         if (mos7840_port_paranoia_check(port, __func__)) {
1122                 dbg("%s", "Invalid port");
1123                 return 0;
1124         }
1125
1126         mos7840_port = mos7840_get_port_private(port);
1127         if (mos7840_port == NULL) {
1128                 dbg("%s", "mos7840_break:leaving ...........");
1129                 return 0;
1130         }
1131
1132         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1133         for (i = 0; i < NUM_URBS; ++i)
1134                 if (mos7840_port->busy[i])
1135                         chars += URB_TRANSFER_BUFFER_SIZE;
1136         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1137         dbg("%s - returns %d", __func__, chars);
1138         return chars;
1139
1140 }
1141
1142 /*****************************************************************************
1143  * mos7840_close
1144  *      this function is called by the tty driver when a port is closed
1145  *****************************************************************************/
1146
1147 static void mos7840_close(struct usb_serial_port *port)
1148 {
1149         struct usb_serial *serial;
1150         struct moschip_port *mos7840_port;
1151         struct moschip_port *port0;
1152         int j;
1153         __u16 Data;
1154
1155         dbg("%s", "mos7840_close:entering...");
1156
1157         if (mos7840_port_paranoia_check(port, __func__)) {
1158                 dbg("%s", "Port Paranoia failed");
1159                 return;
1160         }
1161
1162         serial = mos7840_get_usb_serial(port, __func__);
1163         if (!serial) {
1164                 dbg("%s", "Serial Paranoia failed");
1165                 return;
1166         }
1167
1168         mos7840_port = mos7840_get_port_private(port);
1169         port0 = mos7840_get_port_private(serial->port[0]);
1170
1171         if (mos7840_port == NULL || port0 == NULL)
1172                 return;
1173
1174         for (j = 0; j < NUM_URBS; ++j)
1175                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1176
1177         /* Freeing Write URBs */
1178         for (j = 0; j < NUM_URBS; ++j) {
1179                 if (mos7840_port->write_urb_pool[j]) {
1180                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1181                                 kfree(mos7840_port->write_urb_pool[j]->
1182                                       transfer_buffer);
1183
1184                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1185                 }
1186         }
1187
1188         /* While closing port, shutdown all bulk read, write  *
1189          * and interrupt read if they exists                  */
1190         if (serial->dev) {
1191                 if (mos7840_port->write_urb) {
1192                         dbg("%s", "Shutdown bulk write");
1193                         usb_kill_urb(mos7840_port->write_urb);
1194                 }
1195                 if (mos7840_port->read_urb) {
1196                         dbg("%s", "Shutdown bulk read");
1197                         usb_kill_urb(mos7840_port->read_urb);
1198                         mos7840_port->read_urb_busy = false;
1199                 }
1200                 if ((&mos7840_port->control_urb)) {
1201                         dbg("%s", "Shutdown control read");
1202                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1203                 }
1204         }
1205 /*      if(mos7840_port->ctrl_buf != NULL) */
1206 /*              kfree(mos7840_port->ctrl_buf); */
1207         port0->open_ports--;
1208         dbg("mos7840_num_open_ports in close%d:in port%d",
1209             port0->open_ports, port->number);
1210         if (port0->open_ports == 0) {
1211                 if (serial->port[0]->interrupt_in_urb) {
1212                         dbg("%s", "Shutdown interrupt_in_urb");
1213                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1214                 }
1215         }
1216
1217         if (mos7840_port->write_urb) {
1218                 /* if this urb had a transfer buffer already (old tx) free it */
1219                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1220                         kfree(mos7840_port->write_urb->transfer_buffer);
1221                 usb_free_urb(mos7840_port->write_urb);
1222         }
1223
1224         Data = 0x0;
1225         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1226
1227         Data = 0x00;
1228         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1229
1230         mos7840_port->open = 0;
1231
1232         dbg("%s", "Leaving ............");
1233 }
1234
1235 /************************************************************************
1236  *
1237  * mos7840_block_until_chase_response
1238  *
1239  *      This function will block the close until one of the following:
1240  *              1. Response to our Chase comes from mos7840
1241  *              2. A timeout of 10 seconds without activity has expired
1242  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1243  *
1244  ************************************************************************/
1245
1246 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1247                                         struct moschip_port *mos7840_port)
1248 {
1249         int timeout = 1 * HZ;
1250         int wait = 10;
1251         int count;
1252
1253         while (1) {
1254                 count = mos7840_chars_in_buffer(tty);
1255
1256                 /* Check for Buffer status */
1257                 if (count <= 0)
1258                         return;
1259
1260                 /* Block the thread for a while */
1261                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1262                                                timeout);
1263                 /* No activity.. count down section */
1264                 wait--;
1265                 if (wait == 0) {
1266                         dbg("%s - TIMEOUT", __func__);
1267                         return;
1268                 } else {
1269                         /* Reset timeout value back to seconds */
1270                         wait = 10;
1271                 }
1272         }
1273
1274 }
1275
1276 /*****************************************************************************
1277  * mos7840_break
1278  *      this function sends a break to the port
1279  *****************************************************************************/
1280 static void mos7840_break(struct tty_struct *tty, int break_state)
1281 {
1282         struct usb_serial_port *port = tty->driver_data;
1283         unsigned char data;
1284         struct usb_serial *serial;
1285         struct moschip_port *mos7840_port;
1286
1287         dbg("%s", "Entering ...........");
1288         dbg("mos7840_break: Start");
1289
1290         if (mos7840_port_paranoia_check(port, __func__)) {
1291                 dbg("%s", "Port Paranoia failed");
1292                 return;
1293         }
1294
1295         serial = mos7840_get_usb_serial(port, __func__);
1296         if (!serial) {
1297                 dbg("%s", "Serial Paranoia failed");
1298                 return;
1299         }
1300
1301         mos7840_port = mos7840_get_port_private(port);
1302
1303         if (mos7840_port == NULL)
1304                 return;
1305
1306         if (serial->dev)
1307                 /* flush and block until tx is empty */
1308                 mos7840_block_until_chase_response(tty, mos7840_port);
1309
1310         if (break_state == -1)
1311                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1312         else
1313                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1314
1315         /* FIXME: no locking on shadowLCR anywhere in driver */
1316         mos7840_port->shadowLCR = data;
1317         dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1318             mos7840_port->shadowLCR);
1319         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1320                              mos7840_port->shadowLCR);
1321
1322         return;
1323 }
1324
1325 /*****************************************************************************
1326  * mos7840_write_room
1327  *      this function is called by the tty driver when it wants to know how many
1328  *      bytes of data we can accept for a specific port.
1329  *      If successful, we return the amount of room that we have for this port
1330  *      Otherwise we return a negative error number.
1331  *****************************************************************************/
1332
1333 static int mos7840_write_room(struct tty_struct *tty)
1334 {
1335         struct usb_serial_port *port = tty->driver_data;
1336         int i;
1337         int room = 0;
1338         unsigned long flags;
1339         struct moschip_port *mos7840_port;
1340
1341         dbg("%s", " mos7840_write_room:entering ...........");
1342
1343         if (mos7840_port_paranoia_check(port, __func__)) {
1344                 dbg("%s", "Invalid port");
1345                 dbg("%s", " mos7840_write_room:leaving ...........");
1346                 return -1;
1347         }
1348
1349         mos7840_port = mos7840_get_port_private(port);
1350         if (mos7840_port == NULL) {
1351                 dbg("%s", "mos7840_break:leaving ...........");
1352                 return -1;
1353         }
1354
1355         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1356         for (i = 0; i < NUM_URBS; ++i) {
1357                 if (!mos7840_port->busy[i])
1358                         room += URB_TRANSFER_BUFFER_SIZE;
1359         }
1360         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1361
1362         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1363         dbg("%s - returns %d", __func__, room);
1364         return room;
1365
1366 }
1367
1368 /*****************************************************************************
1369  * mos7840_write
1370  *      this function is called by the tty driver when data should be written to
1371  *      the port.
1372  *      If successful, we return the number of bytes written, otherwise we
1373  *      return a negative error number.
1374  *****************************************************************************/
1375
1376 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1377                          const unsigned char *data, int count)
1378 {
1379         int status;
1380         int i;
1381         int bytes_sent = 0;
1382         int transfer_size;
1383         unsigned long flags;
1384
1385         struct moschip_port *mos7840_port;
1386         struct usb_serial *serial;
1387         struct urb *urb;
1388         /* __u16 Data; */
1389         const unsigned char *current_position = data;
1390         unsigned char *data1;
1391         dbg("%s", "entering ...........");
1392         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1393                                         mos7840_port->shadowLCR); */
1394
1395 #ifdef NOTMOS7840
1396         Data = 0x00;
1397         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1398         mos7840_port->shadowLCR = Data;
1399         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1400         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1401             mos7840_port->shadowLCR);
1402
1403         /* Data = 0x03; */
1404         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1405         /* mos7840_port->shadowLCR=Data;//Need to add later */
1406
1407         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1408         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1409
1410         /* Data = 0x0c; */
1411         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1412         Data = 0x00;
1413         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1414         dbg("mos7840_write:DLL value is %x", Data);
1415
1416         Data = 0x0;
1417         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1418         dbg("mos7840_write:DLM value is %x", Data);
1419
1420         Data = Data & ~SERIAL_LCR_DLAB;
1421         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1422             mos7840_port->shadowLCR);
1423         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1424 #endif
1425
1426         if (mos7840_port_paranoia_check(port, __func__)) {
1427                 dbg("%s", "Port Paranoia failed");
1428                 return -1;
1429         }
1430
1431         serial = port->serial;
1432         if (mos7840_serial_paranoia_check(serial, __func__)) {
1433                 dbg("%s", "Serial Paranoia failed");
1434                 return -1;
1435         }
1436
1437         mos7840_port = mos7840_get_port_private(port);
1438         if (mos7840_port == NULL) {
1439                 dbg("%s", "mos7840_port is NULL");
1440                 return -1;
1441         }
1442
1443         /* try to find a free urb in the list */
1444         urb = NULL;
1445
1446         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1447         for (i = 0; i < NUM_URBS; ++i) {
1448                 if (!mos7840_port->busy[i]) {
1449                         mos7840_port->busy[i] = 1;
1450                         urb = mos7840_port->write_urb_pool[i];
1451                         dbg("URB:%d", i);
1452                         break;
1453                 }
1454         }
1455         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1456
1457         if (urb == NULL) {
1458                 dbg("%s - no more free urbs", __func__);
1459                 goto exit;
1460         }
1461
1462         if (urb->transfer_buffer == NULL) {
1463                 urb->transfer_buffer =
1464                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1465
1466                 if (urb->transfer_buffer == NULL) {
1467                         dev_err(&port->dev, "%s no more kernel memory...\n",
1468                                 __func__);
1469                         goto exit;
1470                 }
1471         }
1472         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1473
1474         memcpy(urb->transfer_buffer, current_position, transfer_size);
1475
1476         /* fill urb with data and submit  */
1477         usb_fill_bulk_urb(urb,
1478                           serial->dev,
1479                           usb_sndbulkpipe(serial->dev,
1480                                           port->bulk_out_endpointAddress),
1481                           urb->transfer_buffer,
1482                           transfer_size,
1483                           mos7840_bulk_out_data_callback, mos7840_port);
1484
1485         data1 = urb->transfer_buffer;
1486         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1487
1488         /* send it down the pipe */
1489         status = usb_submit_urb(urb, GFP_ATOMIC);
1490
1491         if (status) {
1492                 mos7840_port->busy[i] = 0;
1493                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1494                         "with status = %d\n", __func__, status);
1495                 bytes_sent = status;
1496                 goto exit;
1497         }
1498         bytes_sent = transfer_size;
1499         mos7840_port->icount.tx += transfer_size;
1500         smp_wmb();
1501         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1502 exit:
1503         return bytes_sent;
1504
1505 }
1506
1507 /*****************************************************************************
1508  * mos7840_throttle
1509  *      this function is called by the tty driver when it wants to stop the data
1510  *      being read from the port.
1511  *****************************************************************************/
1512
1513 static void mos7840_throttle(struct tty_struct *tty)
1514 {
1515         struct usb_serial_port *port = tty->driver_data;
1516         struct moschip_port *mos7840_port;
1517         int status;
1518
1519         if (mos7840_port_paranoia_check(port, __func__)) {
1520                 dbg("%s", "Invalid port");
1521                 return;
1522         }
1523
1524         dbg("- port %d", port->number);
1525
1526         mos7840_port = mos7840_get_port_private(port);
1527
1528         if (mos7840_port == NULL)
1529                 return;
1530
1531         if (!mos7840_port->open) {
1532                 dbg("%s", "port not opened");
1533                 return;
1534         }
1535
1536         dbg("%s", "Entering ..........");
1537
1538         /* if we are implementing XON/XOFF, send the stop character */
1539         if (I_IXOFF(tty)) {
1540                 unsigned char stop_char = STOP_CHAR(tty);
1541                 status = mos7840_write(tty, port, &stop_char, 1);
1542                 if (status <= 0)
1543                         return;
1544         }
1545         /* if we are implementing RTS/CTS, toggle that line */
1546         if (tty->termios->c_cflag & CRTSCTS) {
1547                 mos7840_port->shadowMCR &= ~MCR_RTS;
1548                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1549                                          mos7840_port->shadowMCR);
1550                 if (status < 0)
1551                         return;
1552         }
1553
1554         return;
1555 }
1556
1557 /*****************************************************************************
1558  * mos7840_unthrottle
1559  *      this function is called by the tty driver when it wants to resume
1560  *      the data being read from the port (called after mos7840_throttle is
1561  *      called)
1562  *****************************************************************************/
1563 static void mos7840_unthrottle(struct tty_struct *tty)
1564 {
1565         struct usb_serial_port *port = tty->driver_data;
1566         int status;
1567         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1568
1569         if (mos7840_port_paranoia_check(port, __func__)) {
1570                 dbg("%s", "Invalid port");
1571                 return;
1572         }
1573
1574         if (mos7840_port == NULL)
1575                 return;
1576
1577         if (!mos7840_port->open) {
1578                 dbg("%s - port not opened", __func__);
1579                 return;
1580         }
1581
1582         dbg("%s", "Entering ..........");
1583
1584         /* if we are implementing XON/XOFF, send the start character */
1585         if (I_IXOFF(tty)) {
1586                 unsigned char start_char = START_CHAR(tty);
1587                 status = mos7840_write(tty, port, &start_char, 1);
1588                 if (status <= 0)
1589                         return;
1590         }
1591
1592         /* if we are implementing RTS/CTS, toggle that line */
1593         if (tty->termios->c_cflag & CRTSCTS) {
1594                 mos7840_port->shadowMCR |= MCR_RTS;
1595                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1596                                          mos7840_port->shadowMCR);
1597                 if (status < 0)
1598                         return;
1599         }
1600 }
1601
1602 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1603 {
1604         struct usb_serial_port *port = tty->driver_data;
1605         struct moschip_port *mos7840_port;
1606         unsigned int result;
1607         __u16 msr;
1608         __u16 mcr;
1609         int status;
1610         mos7840_port = mos7840_get_port_private(port);
1611
1612         dbg("%s - port %d", __func__, port->number);
1613
1614         if (mos7840_port == NULL)
1615                 return -ENODEV;
1616
1617         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1618         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1619         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1620             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1621             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1622             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1623             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1624             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1625             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1626
1627         dbg("%s - 0x%04X", __func__, result);
1628
1629         return result;
1630 }
1631
1632 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1633                             unsigned int set, unsigned int clear)
1634 {
1635         struct usb_serial_port *port = tty->driver_data;
1636         struct moschip_port *mos7840_port;
1637         unsigned int mcr;
1638         int status;
1639
1640         dbg("%s - port %d", __func__, port->number);
1641
1642         mos7840_port = mos7840_get_port_private(port);
1643
1644         if (mos7840_port == NULL)
1645                 return -ENODEV;
1646
1647         /* FIXME: What locks the port registers ? */
1648         mcr = mos7840_port->shadowMCR;
1649         if (clear & TIOCM_RTS)
1650                 mcr &= ~MCR_RTS;
1651         if (clear & TIOCM_DTR)
1652                 mcr &= ~MCR_DTR;
1653         if (clear & TIOCM_LOOP)
1654                 mcr &= ~MCR_LOOPBACK;
1655
1656         if (set & TIOCM_RTS)
1657                 mcr |= MCR_RTS;
1658         if (set & TIOCM_DTR)
1659                 mcr |= MCR_DTR;
1660         if (set & TIOCM_LOOP)
1661                 mcr |= MCR_LOOPBACK;
1662
1663         mos7840_port->shadowMCR = mcr;
1664
1665         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1666         if (status < 0) {
1667                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1668                 return status;
1669         }
1670
1671         return 0;
1672 }
1673
1674 /*****************************************************************************
1675  * mos7840_calc_baud_rate_divisor
1676  *      this function calculates the proper baud rate divisor for the specified
1677  *      baud rate.
1678  *****************************************************************************/
1679 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1680                                           __u16 *clk_sel_val)
1681 {
1682
1683         dbg("%s - %d", __func__, baudRate);
1684
1685         if (baudRate <= 115200) {
1686                 *divisor = 115200 / baudRate;
1687                 *clk_sel_val = 0x0;
1688         }
1689         if ((baudRate > 115200) && (baudRate <= 230400)) {
1690                 *divisor = 230400 / baudRate;
1691                 *clk_sel_val = 0x10;
1692         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1693                 *divisor = 403200 / baudRate;
1694                 *clk_sel_val = 0x20;
1695         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1696                 *divisor = 460800 / baudRate;
1697                 *clk_sel_val = 0x30;
1698         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1699                 *divisor = 806400 / baudRate;
1700                 *clk_sel_val = 0x40;
1701         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1702                 *divisor = 921600 / baudRate;
1703                 *clk_sel_val = 0x50;
1704         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1705                 *divisor = 1572864 / baudRate;
1706                 *clk_sel_val = 0x60;
1707         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1708                 *divisor = 3145728 / baudRate;
1709                 *clk_sel_val = 0x70;
1710         }
1711         return 0;
1712
1713 #ifdef NOTMCS7840
1714
1715         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1716                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1717                         *divisor = mos7840_divisor_table[i].Divisor;
1718                         return 0;
1719                 }
1720         }
1721
1722         /* After trying for all the standard baud rates    *
1723          * Try calculating the divisor for this baud rate  */
1724
1725         if (baudrate > 75 && baudrate < 230400) {
1726                 /* get the divisor */
1727                 custom = (__u16) (230400L / baudrate);
1728
1729                 /* Check for round off */
1730                 round1 = (__u16) (2304000L / baudrate);
1731                 round = (__u16) (round1 - (custom * 10));
1732                 if (round > 4)
1733                         custom++;
1734                 *divisor = custom;
1735
1736                 dbg(" Baud %d = %d", baudrate, custom);
1737                 return 0;
1738         }
1739
1740         dbg("%s", " Baud calculation Failed...");
1741         return -1;
1742 #endif
1743 }
1744
1745 /*****************************************************************************
1746  * mos7840_send_cmd_write_baud_rate
1747  *      this function sends the proper command to change the baud rate of the
1748  *      specified port.
1749  *****************************************************************************/
1750
1751 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1752                                             int baudRate)
1753 {
1754         int divisor = 0;
1755         int status;
1756         __u16 Data;
1757         unsigned char number;
1758         __u16 clk_sel_val;
1759         struct usb_serial_port *port;
1760
1761         if (mos7840_port == NULL)
1762                 return -1;
1763
1764         port = (struct usb_serial_port *)mos7840_port->port;
1765         if (mos7840_port_paranoia_check(port, __func__)) {
1766                 dbg("%s", "Invalid port");
1767                 return -1;
1768         }
1769
1770         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1771                 dbg("%s", "Invalid Serial");
1772                 return -1;
1773         }
1774
1775         dbg("%s", "Entering ..........");
1776
1777         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1778
1779         dbg("%s - port = %d, baud = %d", __func__,
1780             mos7840_port->port->number, baudRate);
1781         /* reset clk_uart_sel in spregOffset */
1782         if (baudRate > 115200) {
1783 #ifdef HW_flow_control
1784                 /* NOTE: need to see the pther register to modify */
1785                 /* setting h/w flow control bit to 1 */
1786                 Data = 0x2b;
1787                 mos7840_port->shadowMCR = Data;
1788                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1789                                                                         Data);
1790                 if (status < 0) {
1791                         dbg("Writing spreg failed in set_serial_baud");
1792                         return -1;
1793                 }
1794 #endif
1795
1796         } else {
1797 #ifdef HW_flow_control
1798                 / *setting h/w flow control bit to 0 */
1799                 Data = 0xb;
1800                 mos7840_port->shadowMCR = Data;
1801                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1802                                                                         Data);
1803                 if (status < 0) {
1804                         dbg("Writing spreg failed in set_serial_baud");
1805                         return -1;
1806                 }
1807 #endif
1808
1809         }
1810
1811         if (1) {                /* baudRate <= 115200) */
1812                 clk_sel_val = 0x0;
1813                 Data = 0x0;
1814                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1815                                                    &clk_sel_val);
1816                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1817                                                                  &Data);
1818                 if (status < 0) {
1819                         dbg("reading spreg failed in set_serial_baud");
1820                         return -1;
1821                 }
1822                 Data = (Data & 0x8f) | clk_sel_val;
1823                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1824                                                                 Data);
1825                 if (status < 0) {
1826                         dbg("Writing spreg failed in set_serial_baud");
1827                         return -1;
1828                 }
1829                 /* Calculate the Divisor */
1830
1831                 if (status) {
1832                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1833                         return status;
1834                 }
1835                 /* Enable access to divisor latch */
1836                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1837                 mos7840_port->shadowLCR = Data;
1838                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1839
1840                 /* Write the divisor */
1841                 Data = (unsigned char)(divisor & 0xff);
1842                 dbg("set_serial_baud Value to write DLL is %x", Data);
1843                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1844
1845                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1846                 dbg("set_serial_baud Value to write DLM is %x", Data);
1847                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1848
1849                 /* Disable access to divisor latch */
1850                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1851                 mos7840_port->shadowLCR = Data;
1852                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1853
1854         }
1855         return status;
1856 }
1857
1858 /*****************************************************************************
1859  * mos7840_change_port_settings
1860  *      This routine is called to set the UART on the device to match
1861  *      the specified new settings.
1862  *****************************************************************************/
1863
1864 static void mos7840_change_port_settings(struct tty_struct *tty,
1865         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1866 {
1867         int baud;
1868         unsigned cflag;
1869         unsigned iflag;
1870         __u8 lData;
1871         __u8 lParity;
1872         __u8 lStop;
1873         int status;
1874         __u16 Data;
1875         struct usb_serial_port *port;
1876         struct usb_serial *serial;
1877
1878         if (mos7840_port == NULL)
1879                 return;
1880
1881         port = (struct usb_serial_port *)mos7840_port->port;
1882
1883         if (mos7840_port_paranoia_check(port, __func__)) {
1884                 dbg("%s", "Invalid port");
1885                 return;
1886         }
1887
1888         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1889                 dbg("%s", "Invalid Serial");
1890                 return;
1891         }
1892
1893         serial = port->serial;
1894
1895         dbg("%s - port %d", __func__, mos7840_port->port->number);
1896
1897         if (!mos7840_port->open) {
1898                 dbg("%s - port not opened", __func__);
1899                 return;
1900         }
1901
1902         dbg("%s", "Entering ..........");
1903
1904         lData = LCR_BITS_8;
1905         lStop = LCR_STOP_1;
1906         lParity = LCR_PAR_NONE;
1907
1908         cflag = tty->termios->c_cflag;
1909         iflag = tty->termios->c_iflag;
1910
1911         /* Change the number of bits */
1912         if (cflag & CSIZE) {
1913                 switch (cflag & CSIZE) {
1914                 case CS5:
1915                         lData = LCR_BITS_5;
1916                         break;
1917
1918                 case CS6:
1919                         lData = LCR_BITS_6;
1920                         break;
1921
1922                 case CS7:
1923                         lData = LCR_BITS_7;
1924                         break;
1925                 default:
1926                 case CS8:
1927                         lData = LCR_BITS_8;
1928                         break;
1929                 }
1930         }
1931         /* Change the Parity bit */
1932         if (cflag & PARENB) {
1933                 if (cflag & PARODD) {
1934                         lParity = LCR_PAR_ODD;
1935                         dbg("%s - parity = odd", __func__);
1936                 } else {
1937                         lParity = LCR_PAR_EVEN;
1938                         dbg("%s - parity = even", __func__);
1939                 }
1940
1941         } else {
1942                 dbg("%s - parity = none", __func__);
1943         }
1944
1945         if (cflag & CMSPAR)
1946                 lParity = lParity | 0x20;
1947
1948         /* Change the Stop bit */
1949         if (cflag & CSTOPB) {
1950                 lStop = LCR_STOP_2;
1951                 dbg("%s - stop bits = 2", __func__);
1952         } else {
1953                 lStop = LCR_STOP_1;
1954                 dbg("%s - stop bits = 1", __func__);
1955         }
1956
1957         /* Update the LCR with the correct value */
1958         mos7840_port->shadowLCR &=
1959             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1960         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1961
1962         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
1963             mos7840_port->shadowLCR);
1964         /* Disable Interrupts */
1965         Data = 0x00;
1966         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1967
1968         Data = 0x00;
1969         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1970
1971         Data = 0xcf;
1972         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1973
1974         /* Send the updated LCR value to the mos7840 */
1975         Data = mos7840_port->shadowLCR;
1976
1977         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1978
1979         Data = 0x00b;
1980         mos7840_port->shadowMCR = Data;
1981         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1982         Data = 0x00b;
1983         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1984
1985         /* set up the MCR register and send it to the mos7840 */
1986
1987         mos7840_port->shadowMCR = MCR_MASTER_IE;
1988         if (cflag & CBAUD)
1989                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1990
1991         if (cflag & CRTSCTS)
1992                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1993         else
1994                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1995
1996         Data = mos7840_port->shadowMCR;
1997         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1998
1999         /* Determine divisor based on baud rate */
2000         baud = tty_get_baud_rate(tty);
2001
2002         if (!baud) {
2003                 /* pick a default, any default... */
2004                 dbg("%s", "Picked default baud...");
2005                 baud = 9600;
2006         }
2007
2008         dbg("%s - baud rate = %d", __func__, baud);
2009         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2010
2011         /* Enable Interrupts */
2012         Data = 0x0c;
2013         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2014
2015         if (mos7840_port->read_urb_busy == false) {
2016                 mos7840_port->read_urb->dev = serial->dev;
2017                 mos7840_port->read_urb_busy = true;
2018                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2019                 if (status) {
2020                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2021                             status);
2022                         mos7840_port->read_urb_busy = false;
2023                 }
2024         }
2025         wake_up(&mos7840_port->delta_msr_wait);
2026         mos7840_port->delta_msr_cond = 1;
2027         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2028             mos7840_port->shadowLCR);
2029
2030         return;
2031 }
2032
2033 /*****************************************************************************
2034  * mos7840_set_termios
2035  *      this function is called by the tty driver when it wants to change
2036  *      the termios structure
2037  *****************************************************************************/
2038
2039 static void mos7840_set_termios(struct tty_struct *tty,
2040                                 struct usb_serial_port *port,
2041                                 struct ktermios *old_termios)
2042 {
2043         int status;
2044         unsigned int cflag;
2045         struct usb_serial *serial;
2046         struct moschip_port *mos7840_port;
2047         dbg("mos7840_set_termios: START");
2048         if (mos7840_port_paranoia_check(port, __func__)) {
2049                 dbg("%s", "Invalid port");
2050                 return;
2051         }
2052
2053         serial = port->serial;
2054
2055         if (mos7840_serial_paranoia_check(serial, __func__)) {
2056                 dbg("%s", "Invalid Serial");
2057                 return;
2058         }
2059
2060         mos7840_port = mos7840_get_port_private(port);
2061
2062         if (mos7840_port == NULL)
2063                 return;
2064
2065         if (!mos7840_port->open) {
2066                 dbg("%s - port not opened", __func__);
2067                 return;
2068         }
2069
2070         dbg("%s", "setting termios - ");
2071
2072         cflag = tty->termios->c_cflag;
2073
2074         dbg("%s - clfag %08x iflag %08x", __func__,
2075             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2076         dbg("%s - old clfag %08x old iflag %08x", __func__,
2077             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2078         dbg("%s - port %d", __func__, port->number);
2079
2080         /* change the port settings to the new ones specified */
2081
2082         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2083
2084         if (!mos7840_port->read_urb) {
2085                 dbg("%s", "URB KILLED !!!!!");
2086                 return;
2087         }
2088
2089         if (mos7840_port->read_urb_busy == false) {
2090                 mos7840_port->read_urb->dev = serial->dev;
2091                 mos7840_port->read_urb_busy = true;
2092                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2093                 if (status) {
2094                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2095                             status);
2096                         mos7840_port->read_urb_busy = false;
2097                 }
2098         }
2099         return;
2100 }
2101
2102 /*****************************************************************************
2103  * mos7840_get_lsr_info - get line status register info
2104  *
2105  * Purpose: Let user call ioctl() to get info when the UART physically
2106  *          is emptied.  On bus types like RS485, the transmitter must
2107  *          release the bus after transmitting. This must be done when
2108  *          the transmit shift register is empty, not be done when the
2109  *          transmit holding register is empty.  This functionality
2110  *          allows an RS485 driver to be written in user space.
2111  *****************************************************************************/
2112
2113 static int mos7840_get_lsr_info(struct tty_struct *tty,
2114                                 unsigned int __user *value)
2115 {
2116         int count;
2117         unsigned int result = 0;
2118
2119         count = mos7840_chars_in_buffer(tty);
2120         if (count == 0) {
2121                 dbg("%s -- Empty", __func__);
2122                 result = TIOCSER_TEMT;
2123         }
2124
2125         if (copy_to_user(value, &result, sizeof(int)))
2126                 return -EFAULT;
2127         return 0;
2128 }
2129
2130 /*****************************************************************************
2131  * mos7840_set_modem_info
2132  *      function to set modem info
2133  *****************************************************************************/
2134
2135 /* FIXME: Should be using the model control hooks */
2136
2137 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2138                                   unsigned int cmd, unsigned int __user *value)
2139 {
2140         unsigned int mcr;
2141         unsigned int arg;
2142         __u16 Data;
2143         int status;
2144         struct usb_serial_port *port;
2145
2146         if (mos7840_port == NULL)
2147                 return -1;
2148
2149         port = (struct usb_serial_port *)mos7840_port->port;
2150         if (mos7840_port_paranoia_check(port, __func__)) {
2151                 dbg("%s", "Invalid port");
2152                 return -1;
2153         }
2154
2155         mcr = mos7840_port->shadowMCR;
2156
2157         if (copy_from_user(&arg, value, sizeof(int)))
2158                 return -EFAULT;
2159
2160         switch (cmd) {
2161         case TIOCMBIS:
2162                 if (arg & TIOCM_RTS)
2163                         mcr |= MCR_RTS;
2164                 if (arg & TIOCM_DTR)
2165                         mcr |= MCR_RTS;
2166                 if (arg & TIOCM_LOOP)
2167                         mcr |= MCR_LOOPBACK;
2168                 break;
2169
2170         case TIOCMBIC:
2171                 if (arg & TIOCM_RTS)
2172                         mcr &= ~MCR_RTS;
2173                 if (arg & TIOCM_DTR)
2174                         mcr &= ~MCR_RTS;
2175                 if (arg & TIOCM_LOOP)
2176                         mcr &= ~MCR_LOOPBACK;
2177                 break;
2178
2179         case TIOCMSET:
2180                 /* turn off the RTS and DTR and LOOPBACK
2181                  * and then only turn on what was asked to */
2182                 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2183                 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2184                 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2185                 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2186                 break;
2187         }
2188
2189         lock_kernel();
2190         mos7840_port->shadowMCR = mcr;
2191
2192         Data = mos7840_port->shadowMCR;
2193         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2194         unlock_kernel();
2195         if (status < 0) {
2196                 dbg("setting MODEM_CONTROL_REGISTER Failed");
2197                 return -1;
2198         }
2199
2200         return 0;
2201 }
2202
2203 /*****************************************************************************
2204  * mos7840_get_modem_info
2205  *      function to get modem info
2206  *****************************************************************************/
2207
2208 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2209                                   unsigned int __user *value)
2210 {
2211         unsigned int result = 0;
2212         __u16 msr;
2213         unsigned int mcr = mos7840_port->shadowMCR;
2214         mos7840_get_uart_reg(mos7840_port->port,
2215                                                 MODEM_STATUS_REGISTER, &msr);
2216         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)      /* 0x002 */
2217             |((mcr & MCR_RTS) ? TIOCM_RTS : 0)  /* 0x004 */
2218             |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)  /* 0x020 */
2219             |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)   /* 0x040 */
2220             |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)    /* 0x080 */
2221             |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2222
2223         dbg("%s -- %x", __func__, result);
2224
2225         if (copy_to_user(value, &result, sizeof(int)))
2226                 return -EFAULT;
2227         return 0;
2228 }
2229
2230 /*****************************************************************************
2231  * mos7840_get_serial_info
2232  *      function to get information about serial port
2233  *****************************************************************************/
2234
2235 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2236                                    struct serial_struct __user *retinfo)
2237 {
2238         struct serial_struct tmp;
2239
2240         if (mos7840_port == NULL)
2241                 return -1;
2242
2243         if (!retinfo)
2244                 return -EFAULT;
2245
2246         memset(&tmp, 0, sizeof(tmp));
2247
2248         tmp.type = PORT_16550A;
2249         tmp.line = mos7840_port->port->serial->minor;
2250         tmp.port = mos7840_port->port->number;
2251         tmp.irq = 0;
2252         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2253         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2254         tmp.baud_base = 9600;
2255         tmp.close_delay = 5 * HZ;
2256         tmp.closing_wait = 30 * HZ;
2257
2258         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2259                 return -EFAULT;
2260         return 0;
2261 }
2262
2263 /*****************************************************************************
2264  * SerialIoctl
2265  *      this function handles any ioctl calls to the driver
2266  *****************************************************************************/
2267
2268 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2269                          unsigned int cmd, unsigned long arg)
2270 {
2271         struct usb_serial_port *port = tty->driver_data;
2272         void __user *argp = (void __user *)arg;
2273         struct moschip_port *mos7840_port;
2274
2275         struct async_icount cnow;
2276         struct async_icount cprev;
2277         struct serial_icounter_struct icount;
2278         int mosret = 0;
2279
2280         if (mos7840_port_paranoia_check(port, __func__)) {
2281                 dbg("%s", "Invalid port");
2282                 return -1;
2283         }
2284
2285         mos7840_port = mos7840_get_port_private(port);
2286
2287         if (mos7840_port == NULL)
2288                 return -1;
2289
2290         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2291
2292         switch (cmd) {
2293                 /* return number of bytes available */
2294
2295         case TIOCSERGETLSR:
2296                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2297                 return mos7840_get_lsr_info(tty, argp);
2298                 return 0;
2299
2300         /* FIXME: use the modem hooks and remove this */
2301         case TIOCMBIS:
2302         case TIOCMBIC:
2303         case TIOCMSET:
2304                 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__,
2305                     port->number);
2306                 mosret =
2307                     mos7840_set_modem_info(mos7840_port, cmd, argp);
2308                 return mosret;
2309
2310         case TIOCMGET:
2311                 dbg("%s (%d) TIOCMGET", __func__, port->number);
2312                 return mos7840_get_modem_info(mos7840_port, argp);
2313
2314         case TIOCGSERIAL:
2315                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2316                 return mos7840_get_serial_info(mos7840_port, argp);
2317
2318         case TIOCSSERIAL:
2319                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2320                 break;
2321
2322         case TIOCMIWAIT:
2323                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2324                 cprev = mos7840_port->icount;
2325                 while (1) {
2326                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2327                         mos7840_port->delta_msr_cond = 0;
2328                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2329                                                  (mos7840_port->
2330                                                   delta_msr_cond == 1));
2331
2332                         /* see if a signal did it */
2333                         if (signal_pending(current))
2334                                 return -ERESTARTSYS;
2335                         cnow = mos7840_port->icount;
2336                         smp_rmb();
2337                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2338                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2339                                 return -EIO;    /* no change => error */
2340                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2341                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2342                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2343                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2344                                 return 0;
2345                         }
2346                         cprev = cnow;
2347                 }
2348                 /* NOTREACHED */
2349                 break;
2350
2351         case TIOCGICOUNT:
2352                 cnow = mos7840_port->icount;
2353                 smp_rmb();
2354                 icount.cts = cnow.cts;
2355                 icount.dsr = cnow.dsr;
2356                 icount.rng = cnow.rng;
2357                 icount.dcd = cnow.dcd;
2358                 icount.rx = cnow.rx;
2359                 icount.tx = cnow.tx;
2360                 icount.frame = cnow.frame;
2361                 icount.overrun = cnow.overrun;
2362                 icount.parity = cnow.parity;
2363                 icount.brk = cnow.brk;
2364                 icount.buf_overrun = cnow.buf_overrun;
2365
2366                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2367                     port->number, icount.rx, icount.tx);
2368                 if (copy_to_user(argp, &icount, sizeof(icount)))
2369                         return -EFAULT;
2370                 return 0;
2371         default:
2372                 break;
2373         }
2374         return -ENOIOCTLCMD;
2375 }
2376
2377 static int mos7840_calc_num_ports(struct usb_serial *serial)
2378 {
2379         int mos7840_num_ports = 0;
2380
2381         dbg("numberofendpoints: cur %d, alt %d",
2382             (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2383             (int)serial->interface->altsetting->desc.bNumEndpoints);
2384         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2385                 mos7840_num_ports = serial->num_ports = 2;
2386         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2387                 serial->num_bulk_in = 4;
2388                 serial->num_bulk_out = 4;
2389                 mos7840_num_ports = serial->num_ports = 4;
2390         }
2391         dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2392         return mos7840_num_ports;
2393 }
2394
2395 /****************************************************************************
2396  * mos7840_startup
2397  ****************************************************************************/
2398
2399 static int mos7840_startup(struct usb_serial *serial)
2400 {
2401         struct moschip_port *mos7840_port;
2402         struct usb_device *dev;
2403         int i, status;
2404
2405         __u16 Data;
2406         dbg("%s", "mos7840_startup :Entering..........");
2407
2408         if (!serial) {
2409                 dbg("%s", "Invalid Handler");
2410                 return -1;
2411         }
2412
2413         dev = serial->dev;
2414
2415         dbg("%s", "Entering...");
2416         dbg ("mos7840_startup: serial = %p", serial);
2417
2418         /* we set up the pointers to the endpoints in the mos7840_open *
2419          * function, as the structures aren't created yet.             */
2420
2421         /* set up port private structures */
2422         for (i = 0; i < serial->num_ports; ++i) {
2423                 dbg ("mos7840_startup: configuring port %d............", i);
2424                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2425                 if (mos7840_port == NULL) {
2426                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2427                         status = -ENOMEM;
2428                         i--; /* don't follow NULL pointer cleaning up */
2429                         goto error;
2430                 }
2431
2432                 /* Initialize all port interrupt end point to port 0 int
2433                  * endpoint. Our device has only one interrupt end point
2434                  * common to all port */
2435
2436                 mos7840_port->port = serial->port[i];
2437                 mos7840_set_port_private(serial->port[i], mos7840_port);
2438                 spin_lock_init(&mos7840_port->pool_lock);
2439
2440                 /* minor is not initialised until later by
2441                  * usb-serial.c:get_free_serial() and cannot therefore be used
2442                  * to index device instances */
2443                 mos7840_port->port_num = i + 1;
2444                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2445                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2446                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2447                 dbg ("serial->minor = %d", serial->minor);
2448
2449                 if (mos7840_port->port_num == 1) {
2450                         mos7840_port->SpRegOffset = 0x0;
2451                         mos7840_port->ControlRegOffset = 0x1;
2452                         mos7840_port->DcrRegOffset = 0x4;
2453                 } else if ((mos7840_port->port_num == 2)
2454                            && (serial->num_ports == 4)) {
2455                         mos7840_port->SpRegOffset = 0x8;
2456                         mos7840_port->ControlRegOffset = 0x9;
2457                         mos7840_port->DcrRegOffset = 0x16;
2458                 } else if ((mos7840_port->port_num == 2)
2459                            && (serial->num_ports == 2)) {
2460                         mos7840_port->SpRegOffset = 0xa;
2461                         mos7840_port->ControlRegOffset = 0xb;
2462                         mos7840_port->DcrRegOffset = 0x19;
2463                 } else if ((mos7840_port->port_num == 3)
2464                            && (serial->num_ports == 4)) {
2465                         mos7840_port->SpRegOffset = 0xa;
2466                         mos7840_port->ControlRegOffset = 0xb;
2467                         mos7840_port->DcrRegOffset = 0x19;
2468                 } else if ((mos7840_port->port_num == 4)
2469                            && (serial->num_ports == 4)) {
2470                         mos7840_port->SpRegOffset = 0xc;
2471                         mos7840_port->ControlRegOffset = 0xd;
2472                         mos7840_port->DcrRegOffset = 0x1c;
2473                 }
2474                 mos7840_dump_serial_port(mos7840_port);
2475                 mos7840_set_port_private(serial->port[i], mos7840_port);
2476
2477                 /* enable rx_disable bit in control register */
2478                 status = mos7840_get_reg_sync(serial->port[i],
2479                                  mos7840_port->ControlRegOffset, &Data);
2480                 if (status < 0) {
2481                         dbg("Reading ControlReg failed status-0x%x", status);
2482                         break;
2483                 } else
2484                         dbg("ControlReg Reading success val is %x, status%d",
2485                             Data, status);
2486                 Data |= 0x08;   /* setting driver done bit */
2487                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2488                                    modem status reg */
2489
2490                 /* Data |= 0x20; //rx_disable bit */
2491                 status = mos7840_set_reg_sync(serial->port[i],
2492                                          mos7840_port->ControlRegOffset, Data);
2493                 if (status < 0) {
2494                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2495                         break;
2496                 } else
2497                         dbg("ControlReg Writing success(rx_disable) status%d",
2498                             status);
2499
2500                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2501                    and 0x24 in DCR3 */
2502                 Data = 0x01;
2503                 status = mos7840_set_reg_sync(serial->port[i],
2504                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2505                 if (status < 0) {
2506                         dbg("Writing DCR0 failed status-0x%x", status);
2507                         break;
2508                 } else
2509                         dbg("DCR0 Writing success status%d", status);
2510
2511                 Data = 0x05;
2512                 status = mos7840_set_reg_sync(serial->port[i],
2513                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2514                 if (status < 0) {
2515                         dbg("Writing DCR1 failed status-0x%x", status);
2516                         break;
2517                 } else
2518                         dbg("DCR1 Writing success status%d", status);
2519
2520                 Data = 0x24;
2521                 status = mos7840_set_reg_sync(serial->port[i],
2522                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2523                 if (status < 0) {
2524                         dbg("Writing DCR2 failed status-0x%x", status);
2525                         break;
2526                 } else
2527                         dbg("DCR2 Writing success status%d", status);
2528
2529                 /* write values in clkstart0x0 and clkmulti 0x20 */
2530                 Data = 0x0;
2531                 status = mos7840_set_reg_sync(serial->port[i],
2532                                          CLK_START_VALUE_REGISTER, Data);
2533                 if (status < 0) {
2534                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2535                         break;
2536                 } else
2537                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2538
2539                 Data = 0x20;
2540                 status = mos7840_set_reg_sync(serial->port[i],
2541                                         CLK_MULTI_REGISTER, Data);
2542                 if (status < 0) {
2543                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2544                             status);
2545                         goto error;
2546                 } else
2547                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2548                             status);
2549
2550                 /* write value 0x0 to scratchpad register */
2551                 Data = 0x00;
2552                 status = mos7840_set_uart_reg(serial->port[i],
2553                                                 SCRATCH_PAD_REGISTER, Data);
2554                 if (status < 0) {
2555                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2556                             status);
2557                         break;
2558                 } else
2559                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2560                             status);
2561
2562                 /* Zero Length flag register */
2563                 if ((mos7840_port->port_num != 1)
2564                     && (serial->num_ports == 2)) {
2565
2566                         Data = 0xff;
2567                         status = mos7840_set_reg_sync(serial->port[i],
2568                                       (__u16) (ZLP_REG1 +
2569                                       ((__u16)mos7840_port->port_num)), Data);
2570                         dbg("ZLIP offset %x",
2571                             (__u16) (ZLP_REG1 +
2572                                         ((__u16) mos7840_port->port_num)));
2573                         if (status < 0) {
2574                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2575                                     i + 2, status);
2576                                 break;
2577                         } else
2578                                 dbg("ZLP_REG%d Writing success status%d",
2579                                     i + 2, status);
2580                 } else {
2581                         Data = 0xff;
2582                         status = mos7840_set_reg_sync(serial->port[i],
2583                               (__u16) (ZLP_REG1 +
2584                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2585                         dbg("ZLIP offset %x",
2586                             (__u16) (ZLP_REG1 +
2587                                      ((__u16) mos7840_port->port_num) - 0x1));
2588                         if (status < 0) {
2589                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2590                                     i + 1, status);
2591                                 break;
2592                         } else
2593                                 dbg("ZLP_REG%d Writing success status%d",
2594                                     i + 1, status);
2595
2596                 }
2597                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2598                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2599                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2600                                                                 GFP_KERNEL);
2601                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2602                                                         !mos7840_port->dr) {
2603                         status = -ENOMEM;
2604                         goto error;
2605                 }
2606         }
2607         dbg ("mos7840_startup: all ports configured...........");
2608
2609         /* Zero Length flag enable */
2610         Data = 0x0f;
2611         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2612         if (status < 0) {
2613                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2614                 goto error;
2615         } else
2616                 dbg("ZLP_REG5 Writing success status%d", status);
2617
2618         /* setting configuration feature to one */
2619         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2620                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2621         return 0;
2622 error:
2623         for (/* nothing */; i >= 0; i--) {
2624                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2625
2626                 kfree(mos7840_port->dr);
2627                 kfree(mos7840_port->ctrl_buf);
2628                 usb_free_urb(mos7840_port->control_urb);
2629                 kfree(mos7840_port);
2630                 serial->port[i] = NULL;
2631         }
2632         return status;
2633 }
2634
2635 /****************************************************************************
2636  * mos7840_disconnect
2637  *      This function is called whenever the device is removed from the usb bus.
2638  ****************************************************************************/
2639
2640 static void mos7840_disconnect(struct usb_serial *serial)
2641 {
2642         int i;
2643         unsigned long flags;
2644         struct moschip_port *mos7840_port;
2645         dbg("%s", " disconnect :entering..........");
2646
2647         if (!serial) {
2648                 dbg("%s", "Invalid Handler");
2649                 return;
2650         }
2651
2652         /* check for the ports to be closed,close the ports and disconnect */
2653
2654         /* free private structure allocated for serial port  *
2655          * stop reads and writes on all ports                */
2656
2657         for (i = 0; i < serial->num_ports; ++i) {
2658                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2659                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2660                 if (mos7840_port) {
2661                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2662                         mos7840_port->zombie = 1;
2663                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2664                         usb_kill_urb(mos7840_port->control_urb);
2665                 }
2666         }
2667
2668         dbg("%s", "Thank u :: ");
2669
2670 }
2671
2672 /****************************************************************************
2673  * mos7840_release
2674  *      This function is called when the usb_serial structure is freed.
2675  ****************************************************************************/
2676
2677 static void mos7840_release(struct usb_serial *serial)
2678 {
2679         int i;
2680         struct moschip_port *mos7840_port;
2681         dbg("%s", " release :entering..........");
2682
2683         if (!serial) {
2684                 dbg("%s", "Invalid Handler");
2685                 return;
2686         }
2687
2688         /* check for the ports to be closed,close the ports and disconnect */
2689
2690         /* free private structure allocated for serial port  *
2691          * stop reads and writes on all ports                */
2692
2693         for (i = 0; i < serial->num_ports; ++i) {
2694                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2695                 dbg("mos7840_port %d = %p", i, mos7840_port);
2696                 if (mos7840_port) {
2697                         kfree(mos7840_port->ctrl_buf);
2698                         kfree(mos7840_port->dr);
2699                         kfree(mos7840_port);
2700                 }
2701         }
2702
2703         dbg("%s", "Thank u :: ");
2704
2705 }
2706
2707 static struct usb_driver io_driver = {
2708         .name = "mos7840",
2709         .probe = usb_serial_probe,
2710         .disconnect = usb_serial_disconnect,
2711         .id_table = moschip_id_table_combined,
2712         .no_dynamic_id = 1,
2713 };
2714
2715 static struct usb_serial_driver moschip7840_4port_device = {
2716         .driver = {
2717                    .owner = THIS_MODULE,
2718                    .name = "mos7840",
2719                    },
2720         .description = DRIVER_DESC,
2721         .usb_driver = &io_driver,
2722         .id_table = moschip_port_id_table,
2723         .num_ports = 4,
2724         .open = mos7840_open,
2725         .close = mos7840_close,
2726         .write = mos7840_write,
2727         .write_room = mos7840_write_room,
2728         .chars_in_buffer = mos7840_chars_in_buffer,
2729         .throttle = mos7840_throttle,
2730         .unthrottle = mos7840_unthrottle,
2731         .calc_num_ports = mos7840_calc_num_ports,
2732 #ifdef MCSSerialProbe
2733         .probe = mos7840_serial_probe,
2734 #endif
2735         .ioctl = mos7840_ioctl,
2736         .set_termios = mos7840_set_termios,
2737         .break_ctl = mos7840_break,
2738         .tiocmget = mos7840_tiocmget,
2739         .tiocmset = mos7840_tiocmset,
2740         .attach = mos7840_startup,
2741         .disconnect = mos7840_disconnect,
2742         .release = mos7840_release,
2743         .read_bulk_callback = mos7840_bulk_in_callback,
2744         .read_int_callback = mos7840_interrupt_callback,
2745 };
2746
2747 /****************************************************************************
2748  * moschip7840_init
2749  *      This is called by the module subsystem, or on startup to initialize us
2750  ****************************************************************************/
2751 static int __init moschip7840_init(void)
2752 {
2753         int retval;
2754
2755         dbg("%s", " mos7840_init :entering..........");
2756
2757         /* Register with the usb serial */
2758         retval = usb_serial_register(&moschip7840_4port_device);
2759
2760         if (retval)
2761                 goto failed_port_device_register;
2762
2763         dbg("%s", "Entering...");
2764         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2765                DRIVER_DESC "\n");
2766
2767         /* Register with the usb */
2768         retval = usb_register(&io_driver);
2769         if (retval == 0) {
2770                 dbg("%s", "Leaving...");
2771                 return 0;
2772         }
2773         usb_serial_deregister(&moschip7840_4port_device);
2774 failed_port_device_register:
2775         return retval;
2776 }
2777
2778 /****************************************************************************
2779  * moschip7840_exit
2780  *      Called when the driver is about to be unloaded.
2781  ****************************************************************************/
2782 static void __exit moschip7840_exit(void)
2783 {
2784
2785         dbg("%s", " mos7840_exit :entering..........");
2786
2787         usb_deregister(&io_driver);
2788
2789         usb_serial_deregister(&moschip7840_4port_device);
2790
2791         dbg("%s", "Entering...");
2792 }
2793
2794 module_init(moschip7840_init);
2795 module_exit(moschip7840_exit);
2796
2797 /* Module information */
2798 MODULE_DESCRIPTION(DRIVER_DESC);
2799 MODULE_LICENSE("GPL");
2800
2801 module_param(debug, bool, S_IRUGO | S_IWUSR);
2802 MODULE_PARM_DESC(debug, "Debug enabled or not");