drivers/usb/serial/option.c

   1 /*
   2   Option Card (PCMCIA to) USB to Serial Driver
   3
   4   Copyright (C) 2005  Matthias Urlichs <smurf@smurf.noris.de>
   5
   6   This driver is free software; you can redistribute it and/or modify
   7   it under the terms of Version 2 of the GNU General Public License as
   8   published by the Free Software Foundation.
   9
  10   Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
  11
  12   History:
  13
  14   2005-05-19  v0.1   Initial version, based on incomplete docs
  15                      and analysis of misbehavior of the standard driver
  16   2005-05-20  v0.2   Extended the input buffer to avoid losing
  17                      random 64-byte chunks of data
  18   2005-05-21  v0.3   implemented chars_in_buffer()
  19                      turned on low_latency
  20                      simplified the code somewhat
  21 */
  22 #define DRIVER_VERSION "v0.3"
  23 #define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
  24 #define DRIVER_DESC "Option Card (PC-Card to) USB to Serial Driver"
  25
  26 #include <linux/config.h>
  27 #include <linux/kernel.h>
  28 #include <linux/jiffies.h>
  29 #include <linux/errno.h>
  30 #include <linux/tty.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/usb.h>
  34 #include "usb-serial.h"
  35
  36 /* Function prototypes */
  37 static int  option_open (struct usb_serial_port *port, struct file *filp);
  38 static void option_close (struct usb_serial_port *port, struct file *filp);
  39 static int  option_startup (struct usb_serial *serial);
  40 static void option_shutdown (struct usb_serial *serial);
  41 static void option_rx_throttle (struct usb_serial_port *port);
  42 static void option_rx_unthrottle (struct usb_serial_port *port);
  43 static int  option_write_room (struct usb_serial_port *port);
  44
  45 static void option_instat_callback(struct urb *urb, struct pt_regs *regs);
  46
  47
  48 static int  option_write (struct usb_serial_port *port,
  49                           const unsigned char *buf, int count);
  50
  51 static int  option_chars_in_buffer (struct usb_serial_port *port);
  52 static int  option_ioctl (struct usb_serial_port *port, struct file *file,
  53                           unsigned int cmd, unsigned long arg);
  54 static void option_set_termios (struct usb_serial_port *port,
  55                                 struct termios *old);
  56 static void option_break_ctl (struct usb_serial_port *port, int break_state);
  57 static int  option_tiocmget (struct usb_serial_port *port, struct file *file);
  58 static int  option_tiocmset (struct usb_serial_port *port, struct file *file,
  59                              unsigned int set, unsigned int clear);
  60 static int  option_send_setup (struct usb_serial_port *port);
  61
  62 /* Vendor and product IDs */
  63 #define OPTION_VENDOR_ID                0x0AF0
  64
  65 #define OPTION_PRODUCT_OLD              0x5000
  66 #define OPTION_PRODUCT_WLAN             0x6000
  67
  68 static struct usb_device_id option_ids[] = {
  69         { USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_OLD) },
  70         { USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_WLAN) },
  71         { } /* Terminating entry */
  72 };
  73
  74 MODULE_DEVICE_TABLE(usb, option_ids);
  75
  76 static struct usb_driver option_driver = {
  77         .owner      = THIS_MODULE,
  78         .name       = "option",
  79         .probe      = usb_serial_probe,
  80         .disconnect = usb_serial_disconnect,
  81         .id_table   = option_ids,
  82 };
  83
  84 /* The card has three separate interfaces, wich the serial driver
  85  * recognizes separately, thus num_port=1.
  86  */
  87 static struct usb_serial_device_type option_3port_device = {
  88         .owner                  = THIS_MODULE,
  89         .name                   = "Option 3-port card",
  90         .short_name             = "option",
  91         .id_table               = option_ids,
  92         .num_interrupt_in       = NUM_DONT_CARE,
  93         .num_bulk_in            = NUM_DONT_CARE,
  94         .num_bulk_out           = NUM_DONT_CARE,
  95         .num_ports              = 1, /* 3 */
  96         .open                   = option_open,
  97         .close                  = option_close,
  98         .write                  = option_write,
  99         .write_room             = option_write_room,
 100         .chars_in_buffer        = option_chars_in_buffer,
 101         .throttle               = option_rx_throttle,
 102         .unthrottle             = option_rx_unthrottle,
 103         .ioctl                  = option_ioctl,
 104         .set_termios            = option_set_termios,
 105         .break_ctl              = option_break_ctl,
 106         .tiocmget               = option_tiocmget,
 107         .tiocmset               = option_tiocmset,
 108         .attach                 = option_startup,
 109         .shutdown               = option_shutdown,
 110         .read_int_callback      = option_instat_callback,
 111 };
 112
 113 static int debug;
 114
 115 /* per port private data */
 116
 117 #define N_IN_URB        4
 118 #define N_OUT_URB       1
 119 #define IN_BUFLEN       1024
 120 #define OUT_BUFLEN      1024
 121
 122 struct option_port_private {
 123         /* Input endpoints and buffer for this port */
 124         struct urb      *in_urbs[N_IN_URB];
 125         char            in_buffer[N_IN_URB][IN_BUFLEN];
 126         /* Output endpoints and buffer for this port */
 127         struct urb      *out_urbs[N_OUT_URB];
 128         char            out_buffer[N_OUT_URB][OUT_BUFLEN];
 129
 130         /* Settings for the port */
 131         int             rts_state;      /* Handshaking pins (outputs) */
 132         int             dtr_state;
 133         int             cts_state;      /* Handshaking pins (inputs) */
 134         int             dsr_state;
 135         int             dcd_state;
 136         int             ri_state;
 137         // int          break_on;
 138
 139         unsigned long   tx_start_time[N_OUT_URB];
 140 };
 141
 142
 143 /* Functions used by new usb-serial code. */
 144 static int __init
 145 option_init (void)
 146 {
 147         int retval;
 148         retval = usb_serial_register(&option_3port_device);
 149         if (retval)
 150                 goto failed_3port_device_register;
 151         retval = usb_register(&option_driver);
 152         if (retval)
 153                 goto failed_driver_register;
 154
 155         info(DRIVER_DESC ": " DRIVER_VERSION);
 156
 157         return 0;
 158
 159 failed_driver_register:
 160         usb_serial_deregister (&option_3port_device);
 161 failed_3port_device_register:
 162         return retval;
 163 }
 164
 165 static void __exit
 166 option_exit (void)
 167 {
 168         usb_deregister (&option_driver);
 169         usb_serial_deregister (&option_3port_device);
 170 }
 171
 172 module_init(option_init);
 173 module_exit(option_exit);
 174
 175 static void
 176 option_rx_throttle (struct usb_serial_port *port)
 177 {
 178         dbg("%s", __FUNCTION__);
 179 }
 180
 181
 182 static void
 183 option_rx_unthrottle (struct usb_serial_port *port)
 184 {
 185         dbg("%s", __FUNCTION__);
 186 }
 187
 188
 189 static void
 190 option_break_ctl (struct usb_serial_port *port, int break_state)
 191 {
 192         /* Unfortunately, I don't know how to send a break */
 193         dbg("%s", __FUNCTION__);
 194 }
 195
 196
 197 static void
 198 option_set_termios (struct usb_serial_port *port,
 199                                      struct termios *old_termios)
 200 {
 201         dbg("%s", __FUNCTION__);
 202
 203         option_send_setup(port);
 204 }
 205
 206 static int
 207 option_tiocmget(struct usb_serial_port *port, struct file *file)
 208 {
 209         unsigned int                    value;
 210         struct option_port_private      *portdata;
 211
 212         portdata = usb_get_serial_port_data(port);
 213
 214         value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
 215                 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
 216                 ((portdata->cts_state) ? TIOCM_CTS : 0) |
 217                 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
 218                 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
 219                 ((portdata->ri_state) ? TIOCM_RNG : 0);
 220
 221         return value;
 222 }
 223
 224 static int
 225 option_tiocmset (struct usb_serial_port *port, struct file *file,
 226                  unsigned int set, unsigned int clear)
 227 {
 228         struct option_port_private      *portdata;
 229
 230         portdata = usb_get_serial_port_data(port);
 231
 232         if (set & TIOCM_RTS)
 233                 portdata->rts_state = 1;
 234         if (set & TIOCM_DTR)
 235                 portdata->dtr_state = 1;
 236
 237         if (clear & TIOCM_RTS)
 238                 portdata->rts_state = 0;
 239         if (clear & TIOCM_DTR)
 240                 portdata->dtr_state = 0;
 241         return option_send_setup(port);
 242 }
 243
 244 static int
 245 option_ioctl (struct usb_serial_port *port, struct file *file,
 246               unsigned int cmd, unsigned long arg)
 247 {
 248         return -ENOIOCTLCMD;
 249 }
 250
 251 /* Write */
 252 static int
 253 option_write(struct usb_serial_port *port,
 254                          const unsigned char *buf, int count)
 255 {
 256         struct option_port_private      *portdata;
 257         int                             i;
 258         int                             left, todo;
 259         struct urb                      *this_urb = NULL; /* spurious */
 260         int                             err;
 261
 262         portdata = usb_get_serial_port_data(port);
 263
 264         dbg("%s: write (%d chars)", __FUNCTION__, count);
 265
 266 #if 0
 267         spin_lock(&port->lock);
 268         if (port->write_urb_busy) {
 269                 spin_unlock(&port->lock);
 270                 dbg("%s: already writing", __FUNCTION__);
 271                 return 0;
 272         }
 273         port->write_urb_busy = 1;
 274         spin_unlock(&port->lock);
 275 #endif
 276
 277         i = 0;
 278         left = count;
 279         while (left>0) {
 280                 todo = left;
 281                 if (todo > OUT_BUFLEN)
 282                         todo = OUT_BUFLEN;
 283
 284                 for (;i < N_OUT_URB; i++) {
 285                         /* Check we have a valid urb/endpoint before we use it... */
 286                         this_urb = portdata->out_urbs[i];
 287                         if (this_urb->status != -EINPROGRESS)
 288                                 break;
 289                         if (this_urb->transfer_flags & URB_ASYNC_UNLINK)
 290                                 continue;
 291                         if (time_before(jiffies, portdata->tx_start_time[i] + 10 * HZ))
 292                                 continue;
 293                         this_urb->transfer_flags |= URB_ASYNC_UNLINK;
 294                         usb_unlink_urb(this_urb);
 295                 }
 296
 297                 if (i == N_OUT_URB) {
 298                         /* no bulk out free! */
 299                         dbg("%s: no output urb -- left %d", __FUNCTION__,count-left);
 300 #if 0
 301                         port->write_urb_busy = 0;
 302 #endif
 303                         return count-left;
 304                 }
 305
 306                 dbg("%s: endpoint %d buf %d", __FUNCTION__, usb_pipeendpoint(this_urb->pipe), i);
 307
 308                 memcpy (this_urb->transfer_buffer, buf, todo);
 309
 310                 /* send the data out the bulk port */
 311                 this_urb->transfer_buffer_length = todo;
 312
 313                 this_urb->transfer_flags &= ~URB_ASYNC_UNLINK;
 314                 this_urb->dev = port->serial->dev;
 315                 err = usb_submit_urb(this_urb, GFP_ATOMIC);
 316                 if (err) {
 317                         dbg("usb_submit_urb %p (write bulk) failed (%d,, has %d)", this_urb, err, this_urb->status);
 318                         continue;
 319                 }
 320                 portdata->tx_start_time[i] = jiffies;
 321                 buf += todo;
 322                 left -= todo;
 323         }
 324
 325         count -= left;
 326 #if 0
 327         port->write_urb_busy = 0;
 328 #endif
 329         dbg("%s: wrote (did %d)", __FUNCTION__, count);
 330         return count;
 331 }
 332
 333 static void
 334 option_indat_callback (struct urb *urb, struct pt_regs *regs)
 335 {
 336         int     i, err;
 337         int endpoint;
 338         struct usb_serial_port *port;
 339         struct tty_struct *tty;
 340         unsigned char *data = urb->transfer_buffer;
 341
 342         dbg("%s: %p", __FUNCTION__, urb);
 343
 344         endpoint = usb_pipeendpoint(urb->pipe);
 345         port = (struct usb_serial_port *) urb->context;
 346
 347         if (urb->status) {
 348                 dbg("%s: nonzero status: %d on endpoint %02x.",
 349                     __FUNCTION__, urb->status, endpoint);
 350         } else {
 351                 tty = port->tty;
 352                 if (urb->actual_length) {
 353                         for (i = 0; i < urb->actual_length ; ++i) {
 354                                 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
 355                                         tty_flip_buffer_push(tty);
 356                                 tty_insert_flip_char(tty, data[i], 0);
 357                         }
 358                         tty_flip_buffer_push(tty);
 359                 } else {
 360                         dbg("%s: empty read urb received", __FUNCTION__);
 361                 }
 362
 363                 /* Resubmit urb so we continue receiving */
 364                 if (port->open_count && urb->status != -ESHUTDOWN) {
 365                         err = usb_submit_urb(urb, GFP_ATOMIC);
 366                         if (err)
 367                                 printk(KERN_ERR "%s: resubmit read urb failed. (%d)", __FUNCTION__, err);
 368                 }
 369         }
 370         return;
 371 }
 372
 373 static void
 374 option_outdat_callback (struct urb *urb, struct pt_regs *regs)
 375 {
 376         struct usb_serial_port *port;
 377
 378         dbg("%s", __FUNCTION__);
 379
 380         port = (struct usb_serial_port *) urb->context;
 381
 382         if (port->open_count)
 383                 schedule_work(&port->work);
 384 }
 385
 386 static void
 387 option_instat_callback (struct urb *urb, struct pt_regs *regs)
 388 {
 389         int err;
 390         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 391         struct option_port_private *portdata = usb_get_serial_port_data(port);
 392         struct usb_serial *serial = port->serial;
 393
 394         dbg("%s", __FUNCTION__);
 395         dbg("%s: urb %p port %p has data %p", __FUNCTION__,urb,port,portdata);
 396
 397         if (urb->status == 0) {
 398                 struct usb_ctrlrequest *req_pkt =
 399                                 (struct usb_ctrlrequest *)urb->transfer_buffer;
 400
 401                 if (!req_pkt) {
 402                         dbg("%s: NULL req_pkt\n", __FUNCTION__);
 403                         return;
 404                 }
 405                 if ((req_pkt->bRequestType == 0xA1) && (req_pkt->bRequest == 0x20)) {
 406                         int old_dcd_state;
 407                         unsigned char signals = *((unsigned char *)
 408                                         urb->transfer_buffer + sizeof(struct usb_ctrlrequest));
 409
 410                         dbg("%s: signal x%x", __FUNCTION__, signals);
 411
 412                         old_dcd_state = portdata->dcd_state;
 413                         portdata->cts_state = 1;
 414                         portdata->dcd_state = ((signals & 0x01) ? 1 : 0);
 415                         portdata->dsr_state = ((signals & 0x02) ? 1 : 0);
 416                         portdata->ri_state = ((signals & 0x08) ? 1 : 0);
 417
 418                         if (port->tty && !C_CLOCAL(port->tty)
 419                                         && old_dcd_state && !portdata->dcd_state) {
 420                                 tty_hangup(port->tty);
 421                         }
 422                 } else
 423                         dbg("%s: type %x req %x", __FUNCTION__, req_pkt->bRequestType,req_pkt->bRequest);
 424         } else
 425                 dbg("%s: error %d", __FUNCTION__, urb->status);
 426
 427         /* Resubmit urb so we continue receiving IRQ data */
 428         if (urb->status != -ESHUTDOWN) {
 429                 urb->dev = serial->dev;
 430                 err = usb_submit_urb(urb, GFP_ATOMIC);
 431                 if (err)
 432                         dbg("%s: resubmit intr urb failed. (%d)", __FUNCTION__, err);
 433         }
 434 }
 435
 436
 437 static int
 438 option_write_room (struct usb_serial_port *port)
 439 {
 440         struct option_port_private *portdata;
 441         int i;
 442         int data_len = 0;
 443         struct urb *this_urb;
 444
 445         portdata = usb_get_serial_port_data(port);
 446
 447         for (i=0; i < N_OUT_URB; i++)
 448                 this_urb = portdata->out_urbs[i];
 449                 if (this_urb && this_urb->status != -EINPROGRESS)
 450                         data_len += OUT_BUFLEN;
 451
 452         dbg("%s: %d", __FUNCTION__, data_len);
 453         return data_len;
 454 }
 455
 456
 457 static int
 458 option_chars_in_buffer (struct usb_serial_port *port)
 459 {
 460         struct option_port_private *portdata;
 461         int i;
 462         int data_len = 0;
 463         struct urb *this_urb;
 464
 465         portdata = usb_get_serial_port_data(port);
 466
 467         for (i=0; i < N_OUT_URB; i++)
 468                 this_urb = portdata->out_urbs[i];
 469                 if (this_urb && this_urb->status == -EINPROGRESS)
 470                         data_len += this_urb->transfer_buffer_length;
 471
 472         dbg("%s: %d", __FUNCTION__, data_len);
 473         return data_len;
 474 }
 475
 476
 477 static int
 478 option_open (struct usb_serial_port *port, struct file *filp)
 479 {
 480         struct option_port_private      *portdata;
 481         struct usb_serial               *serial = port->serial;
 482         int                             i, err;
 483         struct urb                      *urb;
 484
 485         portdata = usb_get_serial_port_data(port);
 486
 487         dbg("%s", __FUNCTION__);
 488
 489         /* Set some sane defaults */
 490         portdata->rts_state = 1;
 491         portdata->dtr_state = 1;
 492
 493         /* Reset low level data toggle and start reading from endpoints */
 494         for (i = 0; i < N_IN_URB; i++) {
 495                 urb = portdata->in_urbs[i];
 496                 if (! urb)
 497                         continue;
 498                 if (urb->dev != serial->dev) {
 499                         dbg("%s: dev %p != %p", __FUNCTION__, urb->dev, serial->dev);
 500                         continue;
 501                 }
 502
 503                 /* make sure endpoint data toggle is synchronized with the device */
 504
 505                 usb_clear_halt(urb->dev, urb->pipe);
 506
 507                 err = usb_submit_urb(urb, GFP_KERNEL);
 508                 if (err) {
 509                         dbg("%s: submit urb %d failed (%d) %d", __FUNCTION__, i, err,
 510                                 urb->transfer_buffer_length);
 511                 }
 512         }
 513
 514         /* Reset low level data toggle on out endpoints */
 515         for (i = 0; i < N_OUT_URB; i++) {
 516                 urb = portdata->out_urbs[i];
 517                 if (! urb)
 518                         continue;
 519                 urb->dev = serial->dev;
 520                 /* usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe), 0); */
 521         }
 522
 523         port->tty->low_latency = 1;
 524
 525         option_send_setup(port);
 526
 527         return (0);
 528 }
 529
 530 static inline void
 531 stop_urb(struct urb *urb)
 532 {
 533         if (urb && urb->status == -EINPROGRESS) {
 534                 urb->transfer_flags &= ~URB_ASYNC_UNLINK;
 535                 usb_kill_urb(urb);
 536         }
 537 }
 538
 539 static void
 540 option_close(struct usb_serial_port *port, struct file *filp)
 541 {
 542         int                     i;
 543         struct usb_serial       *serial = port->serial;
 544         struct option_port_private      *portdata;
 545
 546         dbg("%s", __FUNCTION__);
 547         portdata = usb_get_serial_port_data(port);
 548
 549         portdata->rts_state = 0;
 550         portdata->dtr_state = 0;
 551
 552         if (serial->dev) {
 553                 option_send_setup(port);
 554
 555                 /* Stop reading/writing urbs */
 556                 for (i = 0; i < N_IN_URB; i++)
 557                         stop_urb(portdata->in_urbs[i]);
 558                 for (i = 0; i < N_OUT_URB; i++)
 559                         stop_urb(portdata->out_urbs[i]);
 560         }
 561         port->tty = NULL;
 562 }
 563
 564
 565 /* Helper functions used by option_setup_urbs */
 566 static struct urb *
 567 option_setup_urb (struct usb_serial *serial, int endpoint,
 568                   int dir, void *ctx, char *buf, int len,
 569                   void (*callback)(struct urb *, struct pt_regs *regs))
 570 {
 571         struct urb *urb;
 572
 573         if (endpoint == -1)
 574                 return NULL;            /* endpoint not needed */
 575
 576         urb = usb_alloc_urb(0, GFP_KERNEL);             /* No ISO */
 577         if (urb == NULL) {
 578                 dbg("%s: alloc for endpoint %d failed.", __FUNCTION__, endpoint);
 579                 return NULL;
 580         }
 581
 582                 /* Fill URB using supplied data. */
 583         usb_fill_bulk_urb(urb, serial->dev,
 584                       usb_sndbulkpipe(serial->dev, endpoint) | dir,
 585                       buf, len, callback, ctx);
 586
 587         return urb;
 588 }
 589
 590 /* Setup urbs */
 591 static void
 592 option_setup_urbs(struct usb_serial *serial)
 593 {
 594         int                             j;
 595         struct usb_serial_port          *port;
 596         struct option_port_private      *portdata;
 597
 598         dbg("%s", __FUNCTION__);
 599
 600         port = serial->port[0];
 601         portdata = usb_get_serial_port_data(port);
 602
 603         /* Do indat endpoints first */
 604         for (j = 0; j <= N_IN_URB; ++j) {
 605                 portdata->in_urbs[j] = option_setup_urb (serial,
 606                   port->bulk_in_endpointAddress, USB_DIR_IN, port,
 607                   portdata->in_buffer[j], IN_BUFLEN, option_indat_callback);
 608         }
 609
 610         /* outdat endpoints */
 611         for (j = 0; j <= N_OUT_URB; ++j) {
 612                 portdata->out_urbs[j] = option_setup_urb (serial,
 613                   port->bulk_out_endpointAddress, USB_DIR_OUT, port,
 614                   portdata->out_buffer[j], OUT_BUFLEN, option_outdat_callback);
 615         }
 616 }
 617
 618
 619 static int
 620 option_send_setup(struct usb_serial_port *port)
 621 {
 622         struct usb_serial *serial = port->serial;
 623         struct option_port_private *portdata;
 624
 625         dbg("%s", __FUNCTION__);
 626
 627         portdata = usb_get_serial_port_data(port);
 628
 629         if (port->tty) {
 630                 int val = 0;
 631                 if (portdata->dtr_state)
 632                         val |= 0x01;
 633                 if (portdata->rts_state)
 634                         val |= 0x02;
 635
 636                 return usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 637                                         0x22,0x21,val,0,NULL,0,USB_CTRL_SET_TIMEOUT);
 638         }
 639
 640         return 0;
 641 }
 642
 643
 644 static int
 645 option_startup (struct usb_serial *serial)
 646 {
 647         int                             i, err;
 648         struct usb_serial_port          *port;
 649         struct option_port_private      *portdata;
 650
 651         dbg("%s", __FUNCTION__);
 652
 653         /* Now setup per port private data */
 654         for (i = 0; i < serial->num_ports; i++) {
 655                 port = serial->port[i];
 656                 portdata = kmalloc(sizeof(struct option_port_private), GFP_KERNEL);
 657                 if (!portdata) {
 658                         dbg("%s: kmalloc for option_port_private (%d) failed!.", __FUNCTION__, i);
 659                         return (1);
 660                 }
 661                 memset(portdata, 0, sizeof(struct option_port_private));
 662
 663                 usb_set_serial_port_data(port, portdata);
 664
 665                 if (! port->interrupt_in_urb)
 666                         continue;
 667                 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 668                 if (err)
 669                         dbg("%s: submit irq_in urb failed %d", __FUNCTION__, err);
 670         }
 671
 672         option_setup_urbs(serial);
 673
 674         return (0);
 675 }
 676
 677 static void
 678 option_shutdown (struct usb_serial *serial)
 679 {
 680         int                             i, j;
 681         struct usb_serial_port          *port;
 682         struct option_port_private      *portdata;
 683
 684         dbg("%s", __FUNCTION__);
 685
 686         /* Stop reading/writing urbs */
 687         for (i = 0; i < serial->num_ports; ++i) {
 688                 port = serial->port[i];
 689                 portdata = usb_get_serial_port_data(port);
 690                 for (j = 0; j < N_IN_URB; j++)
 691                         stop_urb(portdata->in_urbs[j]);
 692                 for (j = 0; j < N_OUT_URB; j++)
 693                         stop_urb(portdata->out_urbs[j]);
 694         }
 695
 696         /* Now free them */
 697         for (i = 0; i < serial->num_ports; ++i) {
 698                 port = serial->port[i];
 699                 portdata = usb_get_serial_port_data(port);
 700
 701                 for (j = 0; j < N_IN_URB; j++) {
 702                         if (portdata->in_urbs[j]) {
 703                                 usb_free_urb(portdata->in_urbs[j]);
 704                                 portdata->in_urbs[j] = NULL;
 705                         }
 706                 }
 707                 for (j = 0; j < N_OUT_URB; j++) {
 708                         if (portdata->out_urbs[j]) {
 709                                 usb_free_urb(portdata->out_urbs[j]);
 710                                 portdata->out_urbs[j] = NULL;
 711                         }
 712                 }
 713         }
 714
 715         /* Now free per port private data */
 716         for (i = 0; i < serial->num_ports; i++) {
 717                 port = serial->port[i];
 718                 kfree(usb_get_serial_port_data(port));
 719         }
 720 }
 721
 722 MODULE_AUTHOR(DRIVER_AUTHOR);
 723 MODULE_DESCRIPTION(DRIVER_DESC);
 724 MODULE_VERSION(DRIVER_VERSION);
 725 MODULE_LICENSE("GPL");
 726
 727 module_param(debug, bool, S_IRUGO | S_IWUSR);
 728 MODULE_PARM_DESC(debug, "Debug messages");
 729