drivers/usb/serial/pl2303.c

   1 /*
   2  * Prolific PL2303 USB to serial adaptor driver
   3  *
   4  * Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
   5  *
   6  * Original driver for 2.2.x by anonymous
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  * See Documentation/usb/usb-serial.txt for more information on using this driver
  14  *
  15  * 2002_Mar_26 gkh
  16  *      allowed driver to work properly if there is no tty assigned to a port
  17  *      (this happens for serial console devices.)
  18  *
  19  * 2001_Oct_06 gkh
  20  *      Added RTS and DTR line control.  Thanks to joe@bndlg.de for parts of it.
  21  *
  22  * 2001_Sep_19 gkh
  23  *      Added break support.
  24  *
  25  * 2001_Aug_30 gkh
  26  *      fixed oops in write_bulk_callback.
  27  *
  28  * 2001_Aug_28 gkh
  29  *      reworked buffer logic to be like other usb-serial drivers.  Hopefully
  30  *      removing some reported problems.
  31  *
  32  * 2001_Jun_06 gkh
  33  *      finished porting to 2.4 format.
  34  *
  35  */
  36
  37 #include <linux/config.h>
  38 #include <linux/kernel.h>
  39 #include <linux/errno.h>
  40 #include <linux/init.h>
  41 #include <linux/slab.h>
  42 #include <linux/tty.h>
  43 #include <linux/tty_driver.h>
  44 #include <linux/tty_flip.h>
  45 #include <linux/serial.h>
  46 #include <linux/module.h>
  47 #include <linux/spinlock.h>
  48 #include <asm/uaccess.h>
  49 #include <linux/usb.h>
  50
  51 #ifdef CONFIG_USB_SERIAL_DEBUG
  52         static int debug = 1;
  53 #else
  54         static int debug;
  55 #endif
  56
  57 #include "usb-serial.h"
  58 #include "pl2303.h"
  59
  60 /*
  61  * Version Information
  62  */
  63 #define DRIVER_VERSION "v0.9"
  64 #define DRIVER_DESC "Prolific PL2303 USB to serial adaptor driver"
  65
  66
  67
  68 static struct usb_device_id id_table [] = {
  69         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID) },
  70         { USB_DEVICE(PL2303_VENDOR_ID, PL2303_PRODUCT_ID_RSAQ2) },
  71         { USB_DEVICE(IODATA_VENDOR_ID, IODATA_PRODUCT_ID) },
  72         { USB_DEVICE(ATEN_VENDOR_ID, ATEN_PRODUCT_ID) },
  73         { USB_DEVICE(ELCOM_VENDOR_ID, ELCOM_PRODUCT_ID) },
  74         { USB_DEVICE(ITEGNO_VENDOR_ID, ITEGNO_PRODUCT_ID) },
  75         { USB_DEVICE(MA620_VENDOR_ID, MA620_PRODUCT_ID) },
  76         { USB_DEVICE(RATOC_VENDOR_ID, RATOC_PRODUCT_ID) },
  77         { }                                     /* Terminating entry */
  78 };
  79
  80 MODULE_DEVICE_TABLE (usb, id_table);
  81
  82 static struct usb_driver pl2303_driver = {
  83         .name =         "pl2303",
  84         .probe =        usb_serial_probe,
  85         .disconnect =   usb_serial_disconnect,
  86         .id_table =     id_table,
  87 };
  88
  89 #define SET_LINE_REQUEST_TYPE           0x21
  90 #define SET_LINE_REQUEST                0x20
  91
  92 #define SET_CONTROL_REQUEST_TYPE        0x21
  93 #define SET_CONTROL_REQUEST             0x22
  94 #define CONTROL_DTR                     0x01
  95 #define CONTROL_RTS                     0x02
  96
  97 #define BREAK_REQUEST_TYPE              0x21
  98 #define BREAK_REQUEST                   0x23
  99 #define BREAK_ON                        0xffff
 100 #define BREAK_OFF                       0x0000
 101
 102 #define GET_LINE_REQUEST_TYPE           0xa1
 103 #define GET_LINE_REQUEST                0x21
 104
 105 #define VENDOR_WRITE_REQUEST_TYPE       0x40
 106 #define VENDOR_WRITE_REQUEST            0x01
 107
 108 #define VENDOR_READ_REQUEST_TYPE        0xc0
 109 #define VENDOR_READ_REQUEST             0x01
 110
 111 /* function prototypes for a PL2303 serial converter */
 112 static int pl2303_open (struct usb_serial_port *port, struct file *filp);
 113 static void pl2303_close (struct usb_serial_port *port, struct file *filp);
 114 static void pl2303_set_termios (struct usb_serial_port *port,
 115                                 struct termios *old);
 116 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file,
 117                          unsigned int cmd, unsigned long arg);
 118 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs);
 119 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs);
 120 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
 121 static int pl2303_write (struct usb_serial_port *port, int from_user,
 122                          const unsigned char *buf, int count);
 123 static void pl2303_break_ctl(struct usb_serial_port *port,int break_state);
 124 static int pl2303_startup (struct usb_serial *serial);
 125 static void pl2303_shutdown (struct usb_serial *serial);
 126
 127
 128 /* All of the device info needed for the PL2303 SIO serial converter */
 129 static struct usb_serial_device_type pl2303_device = {
 130         .owner =                THIS_MODULE,
 131         .name =                 "PL-2303",
 132         .id_table =             id_table,
 133         .num_interrupt_in =     NUM_DONT_CARE,
 134         .num_bulk_in =          1,
 135         .num_bulk_out =         1,
 136         .num_ports =            1,
 137         .open =                 pl2303_open,
 138         .close =                pl2303_close,
 139         .write =                pl2303_write,
 140         .ioctl =                pl2303_ioctl,
 141         .break_ctl =            pl2303_break_ctl,
 142         .set_termios =          pl2303_set_termios,
 143         .read_bulk_callback =   pl2303_read_bulk_callback,
 144         .read_int_callback =    pl2303_read_int_callback,
 145         .write_bulk_callback =  pl2303_write_bulk_callback,
 146         .attach =               pl2303_startup,
 147         .shutdown =             pl2303_shutdown,
 148 };
 149
 150 struct pl2303_private {
 151         u8 line_control;
 152         u8 termios_initialized;
 153 };
 154
 155
 156 static int pl2303_startup (struct usb_serial *serial)
 157 {
 158         struct pl2303_private *priv;
 159         int i;
 160
 161         for (i = 0; i < serial->num_ports; ++i) {
 162                 priv = kmalloc (sizeof (struct pl2303_private), GFP_KERNEL);
 163                 if (!priv)
 164                         return -ENOMEM;
 165                 memset (priv, 0x00, sizeof (struct pl2303_private));
 166                 usb_set_serial_port_data(&serial->port[i], priv);
 167         }
 168         return 0;
 169 }
 170
 171 static int set_control_lines (struct usb_device *dev, u8 value)
 172 {
 173         int retval;
 174
 175         retval = usb_control_msg (dev, usb_sndctrlpipe (dev, 0),
 176                                   SET_CONTROL_REQUEST, SET_CONTROL_REQUEST_TYPE,
 177                                   value, 0, NULL, 0, 100);
 178         dbg("%s - value = %d, retval = %d", __FUNCTION__, value, retval);
 179         return retval;
 180 }
 181
 182 static int pl2303_write (struct usb_serial_port *port, int from_user,  const unsigned char *buf, int count)
 183 {
 184         int result;
 185
 186         dbg("%s - port %d, %d bytes", __FUNCTION__, port->number, count);
 187
 188         if (port->write_urb->status == -EINPROGRESS) {
 189                 dbg("%s - already writing", __FUNCTION__);
 190                 return 0;
 191         }
 192
 193         count = (count > port->bulk_out_size) ? port->bulk_out_size : count;
 194         if (from_user) {
 195                 if (copy_from_user (port->write_urb->transfer_buffer, buf, count))
 196                         return -EFAULT;
 197         } else {
 198                 memcpy (port->write_urb->transfer_buffer, buf, count);
 199         }
 200
 201         usb_serial_debug_data (__FILE__, __FUNCTION__, count, port->write_urb->transfer_buffer);
 202
 203         port->write_urb->transfer_buffer_length = count;
 204         port->write_urb->dev = port->serial->dev;
 205         result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 206         if (result)
 207                 dev_err(&port->dev, "%s - failed submitting write urb, error %d\n", __FUNCTION__, result);
 208         else
 209                 result = count;
 210
 211         return result;
 212 }
 213
 214
 215
 216 static void pl2303_set_termios (struct usb_serial_port *port, struct termios *old_termios)
 217 {
 218         struct usb_serial *serial = port->serial;
 219         struct pl2303_private *priv = usb_get_serial_port_data(port);
 220         unsigned int cflag;
 221         unsigned char *buf;
 222         int baud;
 223         int i;
 224
 225         dbg("%s -  port %d, initialized = %d", __FUNCTION__, port->number, priv->termios_initialized);
 226
 227         if ((!port->tty) || (!port->tty->termios)) {
 228                 dbg("%s - no tty structures", __FUNCTION__);
 229                 return;
 230         }
 231
 232         if (!priv->termios_initialized) {
 233                 *(port->tty->termios) = tty_std_termios;
 234                 port->tty->termios->c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
 235                 priv->termios_initialized = 1;
 236         }
 237         cflag = port->tty->termios->c_cflag;
 238         /* check that they really want us to change something */
 239         if (old_termios) {
 240                 if ((cflag == old_termios->c_cflag) &&
 241                     (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
 242                     dbg("%s - nothing to change...", __FUNCTION__);
 243                     return;
 244                 }
 245         }
 246
 247         buf = kmalloc (7, GFP_KERNEL);
 248         if (!buf) {
 249                 dev_err(&port->dev, "%s - out of memory.\n", __FUNCTION__);
 250                 return;
 251         }
 252         memset (buf, 0x00, 0x07);
 253
 254         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 255                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 256                              0, 0, buf, 7, 100);
 257         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 258              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 259
 260
 261         i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 262                              VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
 263                              0, 1, NULL, 0, 100);
 264
 265         dbg ("0x40:1:0:1  %d", i);
 266
 267         if (cflag & CSIZE) {
 268                 switch (cflag & CSIZE) {
 269                         case CS5:       buf[6] = 5;     break;
 270                         case CS6:       buf[6] = 6;     break;
 271                         case CS7:       buf[6] = 7;     break;
 272                         default:
 273                         case CS8:       buf[6] = 8;     break;
 274                 }
 275                 dbg("%s - data bits = %d", __FUNCTION__, buf[6]);
 276         }
 277
 278         baud = 0;
 279         switch (cflag & CBAUD) {
 280                 case B0:        baud = 0;       break;
 281                 case B75:       baud = 75;      break;
 282                 case B150:      baud = 150;     break;
 283                 case B300:      baud = 300;     break;
 284                 case B600:      baud = 600;     break;
 285                 case B1200:     baud = 1200;    break;
 286                 case B1800:     baud = 1800;    break;
 287                 case B2400:     baud = 2400;    break;
 288                 case B4800:     baud = 4800;    break;
 289                 case B9600:     baud = 9600;    break;
 290                 case B19200:    baud = 19200;   break;
 291                 case B38400:    baud = 38400;   break;
 292                 case B57600:    baud = 57600;   break;
 293                 case B115200:   baud = 115200;  break;
 294                 case B230400:   baud = 230400;  break;
 295                 case B460800:   baud = 460800;  break;
 296                 default:
 297                         dev_err(&port->dev, "pl2303 driver does not support the baudrate requested (fix it)\n");
 298                         break;
 299         }
 300         dbg("%s - baud = %d", __FUNCTION__, baud);
 301         if (baud) {
 302                 buf[0] = baud & 0xff;
 303                 buf[1] = (baud >> 8) & 0xff;
 304                 buf[2] = (baud >> 16) & 0xff;
 305                 buf[3] = (baud >> 24) & 0xff;
 306         }
 307
 308         /* For reference buf[4]=0 is 1 stop bits */
 309         /* For reference buf[4]=1 is 1.5 stop bits */
 310         /* For reference buf[4]=2 is 2 stop bits */
 311         if (cflag & CSTOPB) {
 312                 buf[4] = 2;
 313                 dbg("%s - stop bits = 2", __FUNCTION__);
 314         } else {
 315                 buf[4] = 0;
 316                 dbg("%s - stop bits = 1", __FUNCTION__);
 317         }
 318
 319         if (cflag & PARENB) {
 320                 /* For reference buf[5]=0 is none parity */
 321                 /* For reference buf[5]=1 is odd parity */
 322                 /* For reference buf[5]=2 is even parity */
 323                 /* For reference buf[5]=3 is mark parity */
 324                 /* For reference buf[5]=4 is space parity */
 325                 if (cflag & PARODD) {
 326                         buf[5] = 1;
 327                         dbg("%s - parity = odd", __FUNCTION__);
 328                 } else {
 329                         buf[5] = 2;
 330                         dbg("%s - parity = even", __FUNCTION__);
 331                 }
 332         } else {
 333                 buf[5] = 0;
 334                 dbg("%s - parity = none", __FUNCTION__);
 335         }
 336
 337         i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 338                              SET_LINE_REQUEST, SET_LINE_REQUEST_TYPE,
 339                              0, 0, buf, 7, 100);
 340         dbg ("0x21:0x20:0:0  %d", i);
 341
 342         if (cflag && CBAUD) {
 343                 if ((cflag && CBAUD) == B0)
 344                         priv->line_control &= ~(CONTROL_DTR | CONTROL_RTS);
 345                 else
 346                         priv->line_control |= (CONTROL_DTR | CONTROL_RTS);
 347                 set_control_lines (serial->dev, priv->line_control);
 348         }
 349
 350         buf[0] = buf[1] = buf[2] = buf[3] = buf[4] = buf[5] = buf[6] = 0;
 351
 352         i = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 353                              GET_LINE_REQUEST, GET_LINE_REQUEST_TYPE,
 354                              0, 0, buf, 7, 100);
 355         dbg ("0xa1:0x21:0:0  %d - %x %x %x %x %x %x %x", i,
 356              buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]);
 357
 358         if (cflag & CRTSCTS) {
 359                 i = usb_control_msg (serial->dev, usb_sndctrlpipe (serial->dev, 0),
 360                                      VENDOR_WRITE_REQUEST, VENDOR_WRITE_REQUEST_TYPE,
 361                                      0x0, 0x41, NULL, 0, 100);
 362                 dbg ("0x40:0x1:0x0:0x41  %d", i);
 363         }
 364
 365         kfree (buf);
 366 }
 367
 368
 369 static int pl2303_open (struct usb_serial_port *port, struct file *filp)
 370 {
 371         struct termios tmp_termios;
 372         struct usb_serial *serial = port->serial;
 373         unsigned char buf[10];
 374         int result;
 375
 376         if (port_paranoia_check (port, __FUNCTION__))
 377                 return -ENODEV;
 378
 379         dbg("%s -  port %d", __FUNCTION__, port->number);
 380
 381 #define FISH(a,b,c,d)                                                           \
 382         result=usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev,0),     \
 383                                b, a, c, d, buf, 1, 100);                        \
 384         dbg("0x%x:0x%x:0x%x:0x%x  %d - %x",a,b,c,d,result,buf[0]);
 385
 386 #define SOUP(a,b,c,d)                                                           \
 387         result=usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev,0),     \
 388                                b, a, c, d, NULL, 0, 100);                       \
 389         dbg("0x%x:0x%x:0x%x:0x%x  %d",a,b,c,d,result);
 390
 391         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 392         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 0);
 393         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 394         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 395         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 396         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0x0404, 1);
 397         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8484, 0);
 398         FISH (VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, 0x8383, 0);
 399         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 0, 1);
 400         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 1, 0xc0);
 401         SOUP (VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, 2, 4);
 402
 403         /* Setup termios */
 404         if (port->tty) {
 405                 pl2303_set_termios (port, &tmp_termios);
 406         }
 407
 408         //FIXME: need to assert RTS and DTR if CRTSCTS off
 409
 410         dbg("%s - submitting read urb", __FUNCTION__);
 411         port->read_urb->dev = serial->dev;
 412         result = usb_submit_urb (port->read_urb, GFP_KERNEL);
 413         if (result) {
 414                 dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __FUNCTION__, result);
 415                 pl2303_close (port, NULL);
 416                 return -EPROTO;
 417         }
 418
 419         dbg("%s - submitting interrupt urb", __FUNCTION__);
 420         port->interrupt_in_urb->dev = serial->dev;
 421         result = usb_submit_urb (port->interrupt_in_urb, GFP_KERNEL);
 422         if (result) {
 423                 dev_err(&port->dev, "%s - failed submitting interrupt urb, error %d\n", __FUNCTION__, result);
 424                 pl2303_close (port, NULL);
 425                 return -EPROTO;
 426         }
 427         return 0;
 428 }
 429
 430
 431 static void pl2303_close (struct usb_serial_port *port, struct file *filp)
 432 {
 433         struct usb_serial *serial;
 434         struct pl2303_private *priv;
 435         unsigned int c_cflag;
 436         int result;
 437
 438         if (port_paranoia_check (port, __FUNCTION__))
 439                 return;
 440         serial = get_usb_serial (port, __FUNCTION__);
 441         if (!serial)
 442                 return;
 443
 444         dbg("%s - port %d", __FUNCTION__, port->number);
 445
 446         if (serial->dev) {
 447                 if (port->tty) {
 448                         c_cflag = port->tty->termios->c_cflag;
 449                         if (c_cflag & HUPCL) {
 450                                 /* drop DTR and RTS */
 451                                 priv = usb_get_serial_port_data(port);
 452                                 priv->line_control = 0;
 453                                 set_control_lines (port->serial->dev,
 454                                                    priv->line_control);
 455                         }
 456                 }
 457
 458                 /* shutdown our urbs */
 459                 dbg("%s - shutting down urbs", __FUNCTION__);
 460                 result = usb_unlink_urb (port->write_urb);
 461                 if (result)
 462                         dbg("%s - usb_unlink_urb (write_urb)"
 463                             " failed with reason: %d", __FUNCTION__,
 464                              result);
 465
 466                 result = usb_unlink_urb (port->read_urb);
 467                 if (result)
 468                         dbg("%s - usb_unlink_urb (read_urb) "
 469                             "failed with reason: %d", __FUNCTION__,
 470                              result);
 471
 472                 result = usb_unlink_urb (port->interrupt_in_urb);
 473                 if (result)
 474                         dbg("%s - usb_unlink_urb (interrupt_in_urb)"
 475                             " failed with reason: %d", __FUNCTION__,
 476                              result);
 477         }
 478 }
 479
 480 static int set_modem_info (struct usb_serial_port *port, unsigned int cmd, unsigned int *value)
 481 {
 482         struct pl2303_private *priv = usb_get_serial_port_data(port);
 483         unsigned int arg;
 484
 485         if (copy_from_user(&arg, value, sizeof(int)))
 486                 return -EFAULT;
 487
 488         switch (cmd) {
 489                 case TIOCMBIS:
 490                         if (arg & TIOCM_RTS)
 491                                 priv->line_control |= CONTROL_RTS;
 492                         if (arg & TIOCM_DTR)
 493                                 priv->line_control |= CONTROL_DTR;
 494                         break;
 495
 496                 case TIOCMBIC:
 497                         if (arg & TIOCM_RTS)
 498                                 priv->line_control &= ~CONTROL_RTS;
 499                         if (arg & TIOCM_DTR)
 500                                 priv->line_control &= ~CONTROL_DTR;
 501                         break;
 502
 503                 case TIOCMSET:
 504                         /* turn off RTS and DTR and then only turn
 505                            on what was asked to */
 506                         priv->line_control &= ~(CONTROL_RTS | CONTROL_DTR);
 507                         priv->line_control |= ((arg & TIOCM_RTS) ? CONTROL_RTS : 0);
 508                         priv->line_control |= ((arg & TIOCM_DTR) ? CONTROL_DTR : 0);
 509                         break;
 510         }
 511
 512         return set_control_lines (port->serial->dev, priv->line_control);
 513 }
 514
 515 static int get_modem_info (struct usb_serial_port *port, unsigned int *value)
 516 {
 517         struct pl2303_private *priv = usb_get_serial_port_data(port);
 518         unsigned int mcr = priv->line_control;
 519         unsigned int result;
 520
 521         result = ((mcr & CONTROL_DTR)           ? TIOCM_DTR : 0)
 522                   | ((mcr & CONTROL_RTS)        ? TIOCM_RTS : 0);
 523
 524         dbg("%s - result = %x", __FUNCTION__, result);
 525
 526         if (copy_to_user(value, &result, sizeof(int)))
 527                 return -EFAULT;
 528         return 0;
 529 }
 530
 531 static int pl2303_ioctl (struct usb_serial_port *port, struct file *file, unsigned int cmd, unsigned long arg)
 532 {
 533         dbg("%s (%d) cmd = 0x%04x", __FUNCTION__, port->number, cmd);
 534
 535         switch (cmd) {
 536
 537                 case TIOCMGET:
 538                         dbg("%s (%d) TIOCMGET", __FUNCTION__, port->number);
 539                         return get_modem_info (port, (unsigned int *)arg);
 540
 541                 case TIOCMBIS:
 542                 case TIOCMBIC:
 543                 case TIOCMSET:
 544                         dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __FUNCTION__,  port->number);
 545                         return set_modem_info(port, cmd, (unsigned int *) arg);
 546
 547                 default:
 548                         dbg("%s not supported = 0x%04x", __FUNCTION__, cmd);
 549                         break;
 550         }
 551
 552         return -ENOIOCTLCMD;
 553 }
 554
 555
 556 static void pl2303_break_ctl (struct usb_serial_port *port, int break_state)
 557 {
 558         struct usb_serial *serial = port->serial;
 559         u16 state;
 560         int result;
 561
 562         dbg("%s - port %d", __FUNCTION__, port->number);
 563
 564         if (break_state == 0)
 565                 state = BREAK_OFF;
 566         else
 567                 state = BREAK_ON;
 568         dbg("%s - turning break %s", state==BREAK_OFF ? "off" : "on", __FUNCTION__);
 569
 570         result = usb_control_msg (serial->dev, usb_rcvctrlpipe (serial->dev, 0),
 571                                   BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
 572                                   0, NULL, 0, 100);
 573         if (result)
 574                 dbg("%s - error sending break = %d", __FUNCTION__, result);
 575 }
 576
 577
 578 static void pl2303_shutdown (struct usb_serial *serial)
 579 {
 580         int i;
 581
 582         dbg("%s", __FUNCTION__);
 583
 584         for (i = 0; i < serial->num_ports; ++i) {
 585                 kfree (usb_get_serial_port_data(&serial->port[i]));
 586                 usb_set_serial_port_data(&serial->port[i], NULL);
 587         }
 588 }
 589
 590
 591 static void pl2303_read_int_callback (struct urb *urb, struct pt_regs *regs)
 592 {
 593         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 594         struct usb_serial *serial = get_usb_serial (port, __FUNCTION__);
 595         //unsigned char *data = urb->transfer_buffer;
 596         int status;
 597
 598         switch (urb->status) {
 599         case 0:
 600                 /* success */
 601                 break;
 602         case -ECONNRESET:
 603         case -ENOENT:
 604         case -ESHUTDOWN:
 605                 /* this urb is terminated, clean up */
 606                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 607                 return;
 608         default:
 609                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
 610                 goto exit;
 611         }
 612
 613         if (!serial) {
 614                 return;
 615         }
 616
 617         usb_serial_debug_data (__FILE__, __FUNCTION__, urb->actual_length, urb->transfer_buffer);
 618
 619         //FIXME need to update state of terminal lines variable
 620
 621 exit:
 622         status = usb_submit_urb (urb, GFP_ATOMIC);
 623         if (status)
 624                 dev_err(&urb->dev->dev, "%s - usb_submit_urb failed with result %d\n",
 625                         __FUNCTION__, status);
 626 }
 627
 628
 629 static void pl2303_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
 630 {
 631         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 632         struct usb_serial *serial = get_usb_serial (port, __FUNCTION__);
 633         struct tty_struct *tty;
 634         unsigned char *data = urb->transfer_buffer;
 635         int i;
 636         int result;
 637
 638         if (port_paranoia_check (port, __FUNCTION__))
 639                 return;
 640
 641         dbg("%s - port %d", __FUNCTION__, port->number);
 642
 643         if (!serial) {
 644                 dbg("%s - bad serial pointer, exiting", __FUNCTION__);
 645                 return;
 646         }
 647
 648         if (urb->status) {
 649                 dbg("%s - urb->status = %d", __FUNCTION__, urb->status);
 650                 if (!port->open_count) {
 651                         dbg("%s - port is closed, exiting.", __FUNCTION__);
 652                         return;
 653                 }
 654                 if (urb->status == -EPROTO) {
 655                         /* PL2303 mysteriously fails with -EPROTO reschedule the read */
 656                         dbg("%s - caught -EPROTO, resubmitting the urb", __FUNCTION__);
 657                         urb->status = 0;
 658                         urb->dev = serial->dev;
 659                         result = usb_submit_urb(urb, GFP_ATOMIC);
 660                         if (result)
 661                                 dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 662                         return;
 663                 }
 664                 dbg("%s - unable to handle the error, exiting.", __FUNCTION__);
 665                 return;
 666         }
 667
 668         usb_serial_debug_data (__FILE__, __FUNCTION__, urb->actual_length, data);
 669
 670         tty = port->tty;
 671         if (tty && urb->actual_length) {
 672                 for (i = 0; i < urb->actual_length; ++i) {
 673                         if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
 674                                 tty_flip_buffer_push(tty);
 675                         }
 676                         tty_insert_flip_char (tty, data[i], 0);
 677                 }
 678                 tty_flip_buffer_push (tty);
 679         }
 680
 681         /* Schedule the next read _if_ we are still open */
 682         if (port->open_count) {
 683                 urb->dev = serial->dev;
 684                 result = usb_submit_urb(urb, GFP_ATOMIC);
 685                 if (result)
 686                         dev_err(&urb->dev->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 687         }
 688
 689         return;
 690 }
 691
 692
 693
 694 static void pl2303_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
 695 {
 696         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 697         int result;
 698
 699         if (port_paranoia_check (port, __FUNCTION__))
 700                 return;
 701
 702         dbg("%s - port %d", __FUNCTION__, port->number);
 703
 704         if (urb->status) {
 705                 /* error in the urb, so we have to resubmit it */
 706                 if (serial_paranoia_check (port->serial, __FUNCTION__)) {
 707                         return;
 708                 }
 709                 dbg("%s - Overflow in write", __FUNCTION__);
 710                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
 711                 port->write_urb->transfer_buffer_length = 1;
 712                 port->write_urb->dev = port->serial->dev;
 713                 result = usb_submit_urb (port->write_urb, GFP_ATOMIC);
 714                 if (result)
 715                         dev_err(&urb->dev->dev, "%s - failed resubmitting write urb, error %d\n", __FUNCTION__, result);
 716
 717                 return;
 718         }
 719
 720         schedule_work(&port->work);
 721 }
 722
 723
 724 static int __init pl2303_init (void)
 725 {
 726         usb_serial_register (&pl2303_device);
 727         usb_register (&pl2303_driver);
 728         info(DRIVER_DESC " " DRIVER_VERSION);
 729         return 0;
 730 }
 731
 732
 733 static void __exit pl2303_exit (void)
 734 {
 735         usb_deregister (&pl2303_driver);
 736         usb_serial_deregister (&pl2303_device);
 737 }
 738
 739
 740 module_init(pl2303_init);
 741 module_exit(pl2303_exit);
 742
 743 MODULE_DESCRIPTION(DRIVER_DESC);
 744 MODULE_LICENSE("GPL");
 745
 746 MODULE_PARM(debug, "i");
 747 MODULE_PARM_DESC(debug, "Debug enabled or not");
 748