drivers/isdn/gigaset/bas-gigaset.c

   1 /*
   2  * USB driver for Gigaset 307x base via direct USB connection.
   3  *
   4  * Copyright (c) 2001 by Hansjoerg Lipp <hjlipp@web.de>,
   5  *                       Tilman Schmidt <tilman@imap.cc>,
   6  *                       Stefan Eilers.
   7  *
   8  * =====================================================================
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License as
  11  *      published by the Free Software Foundation; either version 2 of
  12  *      the License, or (at your option) any later version.
  13  * =====================================================================
  14  */
  15
  16 #include "gigaset.h"
  17
  18 #include <linux/errno.h>
  19 #include <linux/init.h>
  20 #include <linux/slab.h>
  21 #include <linux/timer.h>
  22 #include <linux/usb.h>
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25
  26 /* Version Information */
  27 #define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
  28 #define DRIVER_DESC "USB Driver for Gigaset 307x"
  29
  30
  31 /* Module parameters */
  32
  33 static int startmode = SM_ISDN;
  34 static int cidmode = 1;
  35
  36 module_param(startmode, int, S_IRUGO);
  37 module_param(cidmode, int, S_IRUGO);
  38 MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
  39 MODULE_PARM_DESC(cidmode, "Call-ID mode");
  40
  41 #define GIGASET_MINORS     1
  42 #define GIGASET_MINOR      16
  43 #define GIGASET_MODULENAME "bas_gigaset"
  44 #define GIGASET_DEVFSNAME  "gig/bas/"
  45 #define GIGASET_DEVNAME    "ttyGB"
  46
  47 /* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
  48 #define IF_WRITEBUF 264
  49
  50 /* Values for the Gigaset 307x */
  51 #define USB_GIGA_VENDOR_ID      0x0681
  52 #define USB_3070_PRODUCT_ID     0x0001
  53 #define USB_3075_PRODUCT_ID     0x0002
  54 #define USB_SX303_PRODUCT_ID    0x0021
  55 #define USB_SX353_PRODUCT_ID    0x0022
  56
  57 /* table of devices that work with this driver */
  58 static struct usb_device_id gigaset_table [] = {
  59         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3070_PRODUCT_ID) },
  60         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3075_PRODUCT_ID) },
  61         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX303_PRODUCT_ID) },
  62         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX353_PRODUCT_ID) },
  63         { } /* Terminating entry */
  64 };
  65
  66 MODULE_DEVICE_TABLE(usb, gigaset_table);
  67
  68 /*======================= local function prototypes ==========================*/
  69
  70 /* function called if a new device belonging to this driver is connected */
  71 static int gigaset_probe(struct usb_interface *interface,
  72                          const struct usb_device_id *id);
  73
  74 /* Function will be called if the device is unplugged */
  75 static void gigaset_disconnect(struct usb_interface *interface);
  76
  77 static int atread_submit(struct cardstate *, int);
  78 static void stopurbs(struct bas_bc_state *);
  79 static int req_submit(struct bc_state *, int, int, int);
  80 static int atwrite_submit(struct cardstate *, unsigned char *, int);
  81 static int start_cbsend(struct cardstate *);
  82
  83 /*============================================================================*/
  84
  85 struct bas_cardstate {
  86         struct usb_device       *udev;          /* USB device pointer */
  87         struct usb_interface    *interface;     /* interface for this device */
  88         unsigned char           minor;          /* starting minor number */
  89
  90         struct urb              *urb_ctrl;      /* control pipe default URB */
  91         struct usb_ctrlrequest  dr_ctrl;
  92         struct timer_list       timer_ctrl;     /* control request timeout */
  93         int                     retry_ctrl;
  94
  95         struct timer_list       timer_atrdy;    /* AT command ready timeout */
  96         struct urb              *urb_cmd_out;   /* for sending AT commands */
  97         struct usb_ctrlrequest  dr_cmd_out;
  98         int                     retry_cmd_out;
  99
 100         struct urb              *urb_cmd_in;    /* for receiving AT replies */
 101         struct usb_ctrlrequest  dr_cmd_in;
 102         struct timer_list       timer_cmd_in;   /* receive request timeout */
 103         unsigned char           *rcvbuf;        /* AT reply receive buffer */
 104
 105         struct urb              *urb_int_in;    /* URB for interrupt pipe */
 106         unsigned char           int_in_buf[3];
 107
 108         spinlock_t              lock;           /* locks all following */
 109         atomic_t                basstate;       /* bitmap (BS_*) */
 110         int                     pending;        /* uncompleted base request */
 111         int                     rcvbuf_size;    /* size of AT receive buffer */
 112                                                 /* 0: no receive in progress */
 113         int                     retry_cmd_in;   /* receive req retry count */
 114 };
 115
 116 /* status of direct USB connection to 307x base (bits in basstate) */
 117 #define BS_ATOPEN       0x001   /* AT channel open */
 118 #define BS_B1OPEN       0x002   /* B channel 1 open */
 119 #define BS_B2OPEN       0x004   /* B channel 2 open */
 120 #define BS_ATREADY      0x008   /* base ready for AT command */
 121 #define BS_INIT         0x010   /* base has signalled INIT_OK */
 122 #define BS_ATTIMER      0x020   /* waiting for HD_READY_SEND_ATDATA */
 123 #define BS_ATRDPEND     0x040   /* urb_cmd_in in use */
 124 #define BS_ATWRPEND     0x080   /* urb_cmd_out in use */
 125
 126
 127 static struct gigaset_driver *driver = NULL;
 128 static struct cardstate *cardstate = NULL;
 129
 130 /* usb specific object needed to register this driver with the usb subsystem */
 131 static struct usb_driver gigaset_usb_driver = {
 132         .name =         GIGASET_MODULENAME,
 133         .probe =        gigaset_probe,
 134         .disconnect =   gigaset_disconnect,
 135         .id_table =     gigaset_table,
 136 };
 137
 138 /* get message text for usb_submit_urb return code
 139  */
 140 static char *get_usb_rcmsg(int rc)
 141 {
 142         static char unkmsg[28];
 143
 144         switch (rc) {
 145         case 0:
 146                 return "success";
 147         case -ENOMEM:
 148                 return "out of memory";
 149         case -ENODEV:
 150                 return "device not present";
 151         case -ENOENT:
 152                 return "endpoint not present";
 153         case -ENXIO:
 154                 return "URB type not supported";
 155         case -EINVAL:
 156                 return "invalid argument";
 157         case -EAGAIN:
 158                 return "start frame too early or too much scheduled";
 159         case -EFBIG:
 160                 return "too many isochronous frames requested";
 161         case -EPIPE:
 162                 return "endpoint stalled";
 163         case -EMSGSIZE:
 164                 return "invalid packet size";
 165         case -ENOSPC:
 166                 return "would overcommit USB bandwidth";
 167         case -ESHUTDOWN:
 168                 return "device shut down";
 169         case -EPERM:
 170                 return "reject flag set";
 171         case -EHOSTUNREACH:
 172                 return "device suspended";
 173         default:
 174                 snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
 175                 return unkmsg;
 176         }
 177 }
 178
 179 /* get message text for USB status code
 180  */
 181 static char *get_usb_statmsg(int status)
 182 {
 183         static char unkmsg[28];
 184
 185         switch (status) {
 186         case 0:
 187                 return "success";
 188         case -ENOENT:
 189                 return "unlinked (sync)";
 190         case -EINPROGRESS:
 191                 return "pending";
 192         case -EPROTO:
 193                 return "bit stuffing error, timeout, or unknown USB error";
 194         case -EILSEQ:
 195                 return "CRC mismatch, timeout, or unknown USB error";
 196         case -ETIMEDOUT:
 197                 return "timed out";
 198         case -EPIPE:
 199                 return "endpoint stalled";
 200         case -ECOMM:
 201                 return "IN buffer overrun";
 202         case -ENOSR:
 203                 return "OUT buffer underrun";
 204         case -EOVERFLOW:
 205                 return "too much data";
 206         case -EREMOTEIO:
 207                 return "short packet detected";
 208         case -ENODEV:
 209                 return "device removed";
 210         case -EXDEV:
 211                 return "partial isochronous transfer";
 212         case -EINVAL:
 213                 return "invalid argument";
 214         case -ECONNRESET:
 215                 return "unlinked (async)";
 216         case -ESHUTDOWN:
 217                 return "device shut down";
 218         default:
 219                 snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
 220                 return unkmsg;
 221         }
 222 }
 223
 224 /* usb_pipetype_str
 225  * retrieve string representation of USB pipe type
 226  */
 227 static inline char *usb_pipetype_str(int pipe)
 228 {
 229         if (usb_pipeisoc(pipe))
 230                 return "Isoc";
 231         if (usb_pipeint(pipe))
 232                 return "Int";
 233         if (usb_pipecontrol(pipe))
 234                 return "Ctrl";
 235         if (usb_pipebulk(pipe))
 236                 return "Bulk";
 237         return "?";
 238 }
 239
 240 /* dump_urb
 241  * write content of URB to syslog for debugging
 242  */
 243 static inline void dump_urb(enum debuglevel level, const char *tag,
 244                             struct urb *urb)
 245 {
 246 #ifdef CONFIG_GIGASET_DEBUG
 247         int i;
 248         gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
 249         if (urb) {
 250                 gig_dbg(level,
 251                         "  dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
 252                         "status=%d, hcpriv=0x%08lx, transfer_flags=0x%x,",
 253                         (unsigned long) urb->dev,
 254                         usb_pipetype_str(urb->pipe),
 255                         usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
 256                         usb_pipein(urb->pipe) ? "in" : "out",
 257                         urb->status, (unsigned long) urb->hcpriv,
 258                         urb->transfer_flags);
 259                 gig_dbg(level,
 260                         "  transfer_buffer=0x%08lx[%d], actual_length=%d, "
 261                         "bandwidth=%d, setup_packet=0x%08lx,",
 262                         (unsigned long) urb->transfer_buffer,
 263                         urb->transfer_buffer_length, urb->actual_length,
 264                         urb->bandwidth, (unsigned long) urb->setup_packet);
 265                 gig_dbg(level,
 266                         "  start_frame=%d, number_of_packets=%d, interval=%d, "
 267                         "error_count=%d,",
 268                         urb->start_frame, urb->number_of_packets, urb->interval,
 269                         urb->error_count);
 270                 gig_dbg(level,
 271                         "  context=0x%08lx, complete=0x%08lx, "
 272                         "iso_frame_desc[]={",
 273                         (unsigned long) urb->context,
 274                         (unsigned long) urb->complete);
 275                 for (i = 0; i < urb->number_of_packets; i++) {
 276                         struct usb_iso_packet_descriptor *pifd
 277                                 = &urb->iso_frame_desc[i];
 278                         gig_dbg(level,
 279                                 "    {offset=%u, length=%u, actual_length=%u, "
 280                                 "status=%u}",
 281                                 pifd->offset, pifd->length, pifd->actual_length,
 282                                 pifd->status);
 283                 }
 284         }
 285         gig_dbg(level, "}}");
 286 #endif
 287 }
 288
 289 /* read/set modem control bits etc. (m10x only) */
 290 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
 291                                   unsigned new_state)
 292 {
 293         return -EINVAL;
 294 }
 295
 296 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
 297 {
 298         return -EINVAL;
 299 }
 300
 301 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
 302 {
 303         return -EINVAL;
 304 }
 305
 306 /* error_hangup
 307  * hang up any existing connection because of an unrecoverable error
 308  * This function may be called from any context and takes care of scheduling
 309  * the necessary actions for execution outside of interrupt context.
 310  * cs->lock must not be held.
 311  * argument:
 312  *      B channel control structure
 313  */
 314 static inline void error_hangup(struct bc_state *bcs)
 315 {
 316         struct cardstate *cs = bcs->cs;
 317
 318         gig_dbg(DEBUG_ANY, "%s: scheduling HUP for channel %d",
 319                 __func__, bcs->channel);
 320
 321         if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL))
 322                 dev_err(cs->dev, "event queue full\n");
 323
 324         gigaset_schedule_event(cs);
 325 }
 326
 327 /* error_reset
 328  * reset Gigaset device because of an unrecoverable error
 329  * This function may be called from any context, and takes care of
 330  * scheduling the necessary actions for execution outside of interrupt context.
 331  * cs->lock must not be held.
 332  * argument:
 333  *      controller state structure
 334  */
 335 static inline void error_reset(struct cardstate *cs)
 336 {
 337         /* close AT command channel to recover (ignore errors) */
 338         req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
 339
 340         //FIXME try to recover without bothering the user
 341         dev_err(cs->dev,
 342             "unrecoverable error - please disconnect Gigaset base to reset\n");
 343 }
 344
 345 /* check_pending
 346  * check for completion of pending control request
 347  * parameter:
 348  *      ucs     hardware specific controller state structure
 349  */
 350 static void check_pending(struct bas_cardstate *ucs)
 351 {
 352         unsigned long flags;
 353
 354         spin_lock_irqsave(&ucs->lock, flags);
 355         switch (ucs->pending) {
 356         case 0:
 357                 break;
 358         case HD_OPEN_ATCHANNEL:
 359                 if (atomic_read(&ucs->basstate) & BS_ATOPEN)
 360                         ucs->pending = 0;
 361                 break;
 362         case HD_OPEN_B1CHANNEL:
 363                 if (atomic_read(&ucs->basstate) & BS_B1OPEN)
 364                         ucs->pending = 0;
 365                 break;
 366         case HD_OPEN_B2CHANNEL:
 367                 if (atomic_read(&ucs->basstate) & BS_B2OPEN)
 368                         ucs->pending = 0;
 369                 break;
 370         case HD_CLOSE_ATCHANNEL:
 371                 if (!(atomic_read(&ucs->basstate) & BS_ATOPEN))
 372                         ucs->pending = 0;
 373                 break;
 374         case HD_CLOSE_B1CHANNEL:
 375                 if (!(atomic_read(&ucs->basstate) & BS_B1OPEN))
 376                         ucs->pending = 0;
 377                 break;
 378         case HD_CLOSE_B2CHANNEL:
 379                 if (!(atomic_read(&ucs->basstate) & BS_B2OPEN))
 380                         ucs->pending = 0;
 381                 break;
 382         case HD_DEVICE_INIT_ACK:                /* no reply expected */
 383                 ucs->pending = 0;
 384                 break;
 385         /* HD_READ_ATMESSAGE, HD_WRITE_ATMESSAGE, HD_RESET_INTERRUPTPIPE
 386          * are handled separately and should never end up here
 387          */
 388         default:
 389                 dev_warn(&ucs->interface->dev,
 390                          "unknown pending request 0x%02x cleared\n",
 391                          ucs->pending);
 392                 ucs->pending = 0;
 393         }
 394
 395         if (!ucs->pending)
 396                 del_timer(&ucs->timer_ctrl);
 397
 398         spin_unlock_irqrestore(&ucs->lock, flags);
 399 }
 400
 401 /* cmd_in_timeout
 402  * timeout routine for command input request
 403  * argument:
 404  *      controller state structure
 405  */
 406 static void cmd_in_timeout(unsigned long data)
 407 {
 408         struct cardstate *cs = (struct cardstate *) data;
 409         struct bas_cardstate *ucs = cs->hw.bas;
 410         int rc;
 411
 412         if (!ucs->rcvbuf_size) {
 413                 gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
 414                 return;
 415         }
 416
 417         if (ucs->retry_cmd_in++ < BAS_RETRY) {
 418                 dev_notice(cs->dev, "control read: timeout, retry %d\n",
 419                            ucs->retry_cmd_in);
 420                 rc = atread_submit(cs, BAS_TIMEOUT);
 421                 if (rc >= 0 || rc == -ENODEV)
 422                         /* resubmitted or disconnected */
 423                         /* - bypass regular exit block */
 424                         return;
 425         } else {
 426                 dev_err(cs->dev,
 427                         "control read: timeout, giving up after %d tries\n",
 428                         ucs->retry_cmd_in);
 429         }
 430         kfree(ucs->rcvbuf);
 431         ucs->rcvbuf = NULL;
 432         ucs->rcvbuf_size = 0;
 433         error_reset(cs);
 434 }
 435
 436 /* set/clear bits in base connection state, return previous state
 437  */
 438 inline static int update_basstate(struct bas_cardstate *ucs,
 439                                   int set, int clear)
 440 {
 441         unsigned long flags;
 442         int state;
 443
 444         spin_lock_irqsave(&ucs->lock, flags);
 445         state = atomic_read(&ucs->basstate);
 446         atomic_set(&ucs->basstate, (state & ~clear) | set);
 447         spin_unlock_irqrestore(&ucs->lock, flags);
 448         return state;
 449 }
 450
 451 /* read_ctrl_callback
 452  * USB completion handler for control pipe input
 453  * called by the USB subsystem in interrupt context
 454  * parameter:
 455  *      urb     USB request block
 456  *              urb->context = inbuf structure for controller state
 457  */
 458 static void read_ctrl_callback(struct urb *urb, struct pt_regs *regs)
 459 {
 460         struct inbuf_t *inbuf = urb->context;
 461         struct cardstate *cs = inbuf->cs;
 462         struct bas_cardstate *ucs = cs->hw.bas;
 463         int have_data = 0;
 464         unsigned numbytes;
 465         int rc;
 466
 467         update_basstate(ucs, 0, BS_ATRDPEND);
 468
 469         if (!ucs->rcvbuf_size) {
 470                 dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
 471                 return;
 472         }
 473
 474         del_timer(&ucs->timer_cmd_in);
 475
 476         switch (urb->status) {
 477         case 0:                         /* normal completion */
 478                 numbytes = urb->actual_length;
 479                 if (unlikely(numbytes != ucs->rcvbuf_size)) {
 480                         dev_warn(cs->dev,
 481                                "control read: received %d chars, expected %d\n",
 482                                  numbytes, ucs->rcvbuf_size);
 483                         if (numbytes > ucs->rcvbuf_size)
 484                                 numbytes = ucs->rcvbuf_size;
 485                 }
 486
 487                 /* copy received bytes to inbuf */
 488                 have_data = gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes);
 489
 490                 if (unlikely(numbytes < ucs->rcvbuf_size)) {
 491                         /* incomplete - resubmit for remaining bytes */
 492                         ucs->rcvbuf_size -= numbytes;
 493                         ucs->retry_cmd_in = 0;
 494                         rc = atread_submit(cs, BAS_TIMEOUT);
 495                         if (rc >= 0 || rc == -ENODEV)
 496                                 /* resubmitted or disconnected */
 497                                 /* - bypass regular exit block */
 498                                 return;
 499                         error_reset(cs);
 500                 }
 501                 break;
 502
 503         case -ENOENT:                   /* cancelled */
 504         case -ECONNRESET:               /* cancelled (async) */
 505         case -EINPROGRESS:              /* pending */
 506         case -ENODEV:                   /* device removed */
 507         case -ESHUTDOWN:                /* device shut down */
 508                 /* no action necessary */
 509                 gig_dbg(DEBUG_USBREQ, "%s: %s",
 510                         __func__, get_usb_statmsg(urb->status));
 511                 break;
 512
 513         default:                        /* severe trouble */
 514                 dev_warn(cs->dev, "control read: %s\n",
 515                          get_usb_statmsg(urb->status));
 516                 if (ucs->retry_cmd_in++ < BAS_RETRY) {
 517                         dev_notice(cs->dev, "control read: retry %d\n",
 518                                    ucs->retry_cmd_in);
 519                         rc = atread_submit(cs, BAS_TIMEOUT);
 520                         if (rc >= 0 || rc == -ENODEV)
 521                                 /* resubmitted or disconnected */
 522                                 /* - bypass regular exit block */
 523                                 return;
 524                 } else {
 525                         dev_err(cs->dev,
 526                                 "control read: giving up after %d tries\n",
 527                                 ucs->retry_cmd_in);
 528                 }
 529                 error_reset(cs);
 530         }
 531
 532         kfree(ucs->rcvbuf);
 533         ucs->rcvbuf = NULL;
 534         ucs->rcvbuf_size = 0;
 535         if (have_data) {
 536                 gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
 537                 gigaset_schedule_event(cs);
 538         }
 539 }
 540
 541 /* atread_submit
 542  * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
 543  * parameters:
 544  *      cs      controller state structure
 545  *      timeout timeout in 1/10 sec., 0: none
 546  * return value:
 547  *      0 on success
 548  *      -EBUSY if another request is pending
 549  *      any URB submission error code
 550  */
 551 static int atread_submit(struct cardstate *cs, int timeout)
 552 {
 553         struct bas_cardstate *ucs = cs->hw.bas;
 554         int ret;
 555
 556         gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
 557                 ucs->rcvbuf_size);
 558
 559         if (update_basstate(ucs, BS_ATRDPEND, 0) & BS_ATRDPEND) {
 560                 dev_err(cs->dev,
 561                         "could not submit HD_READ_ATMESSAGE: URB busy\n");
 562                 return -EBUSY;
 563         }
 564
 565         ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
 566         ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
 567         ucs->dr_cmd_in.wValue = 0;
 568         ucs->dr_cmd_in.wIndex = 0;
 569         ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
 570         usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
 571                              usb_rcvctrlpipe(ucs->udev, 0),
 572                              (unsigned char*) & ucs->dr_cmd_in,
 573                              ucs->rcvbuf, ucs->rcvbuf_size,
 574                              read_ctrl_callback, cs->inbuf);
 575
 576         if ((ret = usb_submit_urb(ucs->urb_cmd_in, SLAB_ATOMIC)) != 0) {
 577                 update_basstate(ucs, 0, BS_ATRDPEND);
 578                 dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
 579                         get_usb_rcmsg(ret));
 580                 return ret;
 581         }
 582
 583         if (timeout > 0) {
 584                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
 585                 ucs->timer_cmd_in.expires = jiffies + timeout * HZ / 10;
 586                 ucs->timer_cmd_in.data = (unsigned long) cs;
 587                 ucs->timer_cmd_in.function = cmd_in_timeout;
 588                 add_timer(&ucs->timer_cmd_in);
 589         }
 590         return 0;
 591 }
 592
 593 /* read_int_callback
 594  * USB completion handler for interrupt pipe input
 595  * called by the USB subsystem in interrupt context
 596  * parameter:
 597  *      urb     USB request block
 598  *              urb->context = controller state structure
 599  */
 600 static void read_int_callback(struct urb *urb, struct pt_regs *regs)
 601 {
 602         struct cardstate *cs = urb->context;
 603         struct bas_cardstate *ucs = cs->hw.bas;
 604         struct bc_state *bcs;
 605         unsigned long flags;
 606         int rc;
 607         unsigned l;
 608         int channel;
 609
 610         switch (urb->status) {
 611         case 0:                 /* success */
 612                 break;
 613         case -ENOENT:                   /* cancelled */
 614         case -ECONNRESET:               /* cancelled (async) */
 615         case -EINPROGRESS:              /* pending */
 616                 /* ignore silently */
 617                 gig_dbg(DEBUG_USBREQ, "%s: %s",
 618                         __func__, get_usb_statmsg(urb->status));
 619                 return;
 620         case -ENODEV:                   /* device removed */
 621         case -ESHUTDOWN:                /* device shut down */
 622                 //FIXME use this as disconnect indicator?
 623                 gig_dbg(DEBUG_USBREQ, "%s: device disconnected", __func__);
 624                 return;
 625         default:                /* severe trouble */
 626                 dev_warn(cs->dev, "interrupt read: %s\n",
 627                          get_usb_statmsg(urb->status));
 628                 //FIXME corrective action? resubmission always ok?
 629                 goto resubmit;
 630         }
 631
 632         /* drop incomplete packets even if the missing bytes wouldn't matter */
 633         if (unlikely(urb->actual_length < 3)) {
 634                 dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
 635                          urb->actual_length);
 636                 goto resubmit;
 637         }
 638
 639         l = (unsigned) ucs->int_in_buf[1] +
 640             (((unsigned) ucs->int_in_buf[2]) << 8);
 641
 642         gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
 643                 urb->actual_length, (int)ucs->int_in_buf[0], l,
 644                 (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
 645
 646         channel = 0;
 647
 648         switch (ucs->int_in_buf[0]) {
 649         case HD_DEVICE_INIT_OK:
 650                 update_basstate(ucs, BS_INIT, 0);
 651                 break;
 652
 653         case HD_READY_SEND_ATDATA:
 654                 del_timer(&ucs->timer_atrdy);
 655                 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
 656                 start_cbsend(cs);
 657                 break;
 658
 659         case HD_OPEN_B2CHANNEL_ACK:
 660                 ++channel;
 661         case HD_OPEN_B1CHANNEL_ACK:
 662                 bcs = cs->bcs + channel;
 663                 update_basstate(ucs, BS_B1OPEN << channel, 0);
 664                 gigaset_bchannel_up(bcs);
 665                 break;
 666
 667         case HD_OPEN_ATCHANNEL_ACK:
 668                 update_basstate(ucs, BS_ATOPEN, 0);
 669                 start_cbsend(cs);
 670                 break;
 671
 672         case HD_CLOSE_B2CHANNEL_ACK:
 673                 ++channel;
 674         case HD_CLOSE_B1CHANNEL_ACK:
 675                 bcs = cs->bcs + channel;
 676                 update_basstate(ucs, 0, BS_B1OPEN << channel);
 677                 stopurbs(bcs->hw.bas);
 678                 gigaset_bchannel_down(bcs);
 679                 break;
 680
 681         case HD_CLOSE_ATCHANNEL_ACK:
 682                 update_basstate(ucs, 0, BS_ATOPEN);
 683                 break;
 684
 685         case HD_B2_FLOW_CONTROL:
 686                 ++channel;
 687         case HD_B1_FLOW_CONTROL:
 688                 bcs = cs->bcs + channel;
 689                 atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
 690                            &bcs->hw.bas->corrbytes);
 691                 gig_dbg(DEBUG_ISO,
 692                         "Flow control (channel %d, sub %d): 0x%02x => %d",
 693                         channel, bcs->hw.bas->numsub, l,
 694                         atomic_read(&bcs->hw.bas->corrbytes));
 695                 break;
 696
 697         case HD_RECEIVEATDATA_ACK:      /* AT response ready to be received */
 698                 if (!l) {
 699                         dev_warn(cs->dev,
 700                                 "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
 701                         break;
 702                 }
 703                 spin_lock_irqsave(&cs->lock, flags);
 704                 if (ucs->rcvbuf_size) {
 705                         /* throw away previous buffer - we have no queue */
 706                         dev_err(cs->dev,
 707                                 "receive AT data overrun, %d bytes lost\n",
 708                                 ucs->rcvbuf_size);
 709                         kfree(ucs->rcvbuf);
 710                         ucs->rcvbuf_size = 0;
 711                 }
 712                 if ((ucs->rcvbuf = kmalloc(l, GFP_ATOMIC)) == NULL) {
 713                         spin_unlock_irqrestore(&cs->lock, flags);
 714                         dev_err(cs->dev, "out of memory receiving AT data\n");
 715                         error_reset(cs);
 716                         break;
 717                 }
 718                 ucs->rcvbuf_size = l;
 719                 ucs->retry_cmd_in = 0;
 720                 if ((rc = atread_submit(cs, BAS_TIMEOUT)) < 0) {
 721                         kfree(ucs->rcvbuf);
 722                         ucs->rcvbuf = NULL;
 723                         ucs->rcvbuf_size = 0;
 724                         if (rc != -ENODEV) {
 725                                 //FIXME corrective action?
 726                                 spin_unlock_irqrestore(&cs->lock, flags);
 727                                 error_reset(cs);
 728                                 break;
 729                         }
 730                 }
 731                 spin_unlock_irqrestore(&cs->lock, flags);
 732                 break;
 733
 734         case HD_RESET_INTERRUPT_PIPE_ACK:
 735                 gig_dbg(DEBUG_USBREQ, "HD_RESET_INTERRUPT_PIPE_ACK");
 736                 break;
 737
 738         case HD_SUSPEND_END:
 739                 gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
 740                 break;
 741
 742         default:
 743                 dev_warn(cs->dev,
 744                          "unknown Gigaset signal 0x%02x (%u) ignored\n",
 745                          (int) ucs->int_in_buf[0], l);
 746         }
 747
 748         check_pending(ucs);
 749
 750 resubmit:
 751         rc = usb_submit_urb(urb, SLAB_ATOMIC);
 752         if (unlikely(rc != 0 && rc != -ENODEV)) {
 753                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
 754                         get_usb_rcmsg(rc));
 755                 error_reset(cs);
 756         }
 757 }
 758
 759 /* read_iso_callback
 760  * USB completion handler for B channel isochronous input
 761  * called by the USB subsystem in interrupt context
 762  * parameter:
 763  *      urb     USB request block of completed request
 764  *              urb->context = bc_state structure
 765  */
 766 static void read_iso_callback(struct urb *urb, struct pt_regs *regs)
 767 {
 768         struct bc_state *bcs;
 769         struct bas_bc_state *ubc;
 770         unsigned long flags;
 771         int i, rc;
 772
 773         /* status codes not worth bothering the tasklet with */
 774         if (unlikely(urb->status == -ENOENT ||
 775                      urb->status == -ECONNRESET ||
 776                      urb->status == -EINPROGRESS ||
 777                      urb->status == -ENODEV ||
 778                      urb->status == -ESHUTDOWN)) {
 779                 gig_dbg(DEBUG_ISO, "%s: %s",
 780                         __func__, get_usb_statmsg(urb->status));
 781                 return;
 782         }
 783
 784         bcs = urb->context;
 785         ubc = bcs->hw.bas;
 786
 787         spin_lock_irqsave(&ubc->isoinlock, flags);
 788         if (likely(ubc->isoindone == NULL)) {
 789                 /* pass URB to tasklet */
 790                 ubc->isoindone = urb;
 791                 tasklet_schedule(&ubc->rcvd_tasklet);
 792         } else {
 793                 /* tasklet still busy, drop data and resubmit URB */
 794                 ubc->loststatus = urb->status;
 795                 for (i = 0; i < BAS_NUMFRAMES; i++) {
 796                         ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
 797                         if (unlikely(urb->iso_frame_desc[i].status != 0 &&
 798                                      urb->iso_frame_desc[i].status !=
 799                                                                 -EINPROGRESS))
 800                                 ubc->loststatus = urb->iso_frame_desc[i].status;
 801                         urb->iso_frame_desc[i].status = 0;
 802                         urb->iso_frame_desc[i].actual_length = 0;
 803                 }
 804                 if (likely(atomic_read(&ubc->running))) {
 805                         /* urb->dev is clobbered by USB subsystem */
 806                         urb->dev = bcs->cs->hw.bas->udev;
 807                         urb->transfer_flags = URB_ISO_ASAP;
 808                         urb->number_of_packets = BAS_NUMFRAMES;
 809                         gig_dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit",
 810                                 __func__);
 811                         rc = usb_submit_urb(urb, SLAB_ATOMIC);
 812                         if (unlikely(rc != 0 && rc != -ENODEV)) {
 813                                 dev_err(bcs->cs->dev,
 814                                         "could not resubmit isochronous read "
 815                                         "URB: %s\n", get_usb_rcmsg(rc));
 816                                 dump_urb(DEBUG_ISO, "isoc read", urb);
 817                                 error_hangup(bcs);
 818                         }
 819                 }
 820         }
 821         spin_unlock_irqrestore(&ubc->isoinlock, flags);
 822 }
 823
 824 /* write_iso_callback
 825  * USB completion handler for B channel isochronous output
 826  * called by the USB subsystem in interrupt context
 827  * parameter:
 828  *      urb     USB request block of completed request
 829  *              urb->context = isow_urbctx_t structure
 830  */
 831 static void write_iso_callback(struct urb *urb, struct pt_regs *regs)
 832 {
 833         struct isow_urbctx_t *ucx;
 834         struct bas_bc_state *ubc;
 835         unsigned long flags;
 836
 837         /* status codes not worth bothering the tasklet with */
 838         if (unlikely(urb->status == -ENOENT ||
 839                      urb->status == -ECONNRESET ||
 840                      urb->status == -EINPROGRESS ||
 841                      urb->status == -ENODEV ||
 842                      urb->status == -ESHUTDOWN)) {
 843                 gig_dbg(DEBUG_ISO, "%s: %s",
 844                         __func__, get_usb_statmsg(urb->status));
 845                 return;
 846         }
 847
 848         /* pass URB context to tasklet */
 849         ucx = urb->context;
 850         ubc = ucx->bcs->hw.bas;
 851
 852         spin_lock_irqsave(&ubc->isooutlock, flags);
 853         ubc->isooutovfl = ubc->isooutdone;
 854         ubc->isooutdone = ucx;
 855         spin_unlock_irqrestore(&ubc->isooutlock, flags);
 856         tasklet_schedule(&ubc->sent_tasklet);
 857 }
 858
 859 /* starturbs
 860  * prepare and submit USB request blocks for isochronous input and output
 861  * argument:
 862  *      B channel control structure
 863  * return value:
 864  *      0 on success
 865  *      < 0 on error (no URBs submitted)
 866  */
 867 static int starturbs(struct bc_state *bcs)
 868 {
 869         struct bas_bc_state *ubc = bcs->hw.bas;
 870         struct urb *urb;
 871         int j, k;
 872         int rc;
 873
 874         /* initialize L2 reception */
 875         if (bcs->proto2 == ISDN_PROTO_L2_HDLC)
 876                 bcs->inputstate |= INS_flag_hunt;
 877
 878         /* submit all isochronous input URBs */
 879         atomic_set(&ubc->running, 1);
 880         for (k = 0; k < BAS_INURBS; k++) {
 881                 urb = ubc->isoinurbs[k];
 882                 if (!urb) {
 883                         rc = -EFAULT;
 884                         goto error;
 885                 }
 886
 887                 urb->dev = bcs->cs->hw.bas->udev;
 888                 urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
 889                 urb->transfer_flags = URB_ISO_ASAP;
 890                 urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
 891                 urb->transfer_buffer_length = BAS_INBUFSIZE;
 892                 urb->number_of_packets = BAS_NUMFRAMES;
 893                 urb->interval = BAS_FRAMETIME;
 894                 urb->complete = read_iso_callback;
 895                 urb->context = bcs;
 896                 for (j = 0; j < BAS_NUMFRAMES; j++) {
 897                         urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
 898                         urb->iso_frame_desc[j].length = BAS_MAXFRAME;
 899                         urb->iso_frame_desc[j].status = 0;
 900                         urb->iso_frame_desc[j].actual_length = 0;
 901                 }
 902
 903                 dump_urb(DEBUG_ISO, "Initial isoc read", urb);
 904                 if ((rc = usb_submit_urb(urb, SLAB_ATOMIC)) != 0)
 905                         goto error;
 906         }
 907
 908         /* initialize L2 transmission */
 909         gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
 910
 911         /* set up isochronous output URBs for flag idling */
 912         for (k = 0; k < BAS_OUTURBS; ++k) {
 913                 urb = ubc->isoouturbs[k].urb;
 914                 if (!urb) {
 915                         rc = -EFAULT;
 916                         goto error;
 917                 }
 918                 urb->dev = bcs->cs->hw.bas->udev;
 919                 urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
 920                 urb->transfer_flags = URB_ISO_ASAP;
 921                 urb->transfer_buffer = ubc->isooutbuf->data;
 922                 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
 923                 urb->number_of_packets = BAS_NUMFRAMES;
 924                 urb->interval = BAS_FRAMETIME;
 925                 urb->complete = write_iso_callback;
 926                 urb->context = &ubc->isoouturbs[k];
 927                 for (j = 0; j < BAS_NUMFRAMES; ++j) {
 928                         urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
 929                         urb->iso_frame_desc[j].length = BAS_NORMFRAME;
 930                         urb->iso_frame_desc[j].status = 0;
 931                         urb->iso_frame_desc[j].actual_length = 0;
 932                 }
 933                 ubc->isoouturbs[k].limit = -1;
 934         }
 935
 936         /* submit two URBs, keep third one */
 937         for (k = 0; k < 2; ++k) {
 938                 dump_urb(DEBUG_ISO, "Initial isoc write", urb);
 939                 rc = usb_submit_urb(ubc->isoouturbs[k].urb, SLAB_ATOMIC);
 940                 if (rc != 0)
 941                         goto error;
 942         }
 943         dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
 944         ubc->isooutfree = &ubc->isoouturbs[2];
 945         ubc->isooutdone = ubc->isooutovfl = NULL;
 946         return 0;
 947  error:
 948         stopurbs(ubc);
 949         return rc;
 950 }
 951
 952 /* stopurbs
 953  * cancel the USB request blocks for isochronous input and output
 954  * errors are silently ignored
 955  * argument:
 956  *      B channel control structure
 957  */
 958 static void stopurbs(struct bas_bc_state *ubc)
 959 {
 960         int k, rc;
 961
 962         atomic_set(&ubc->running, 0);
 963
 964         for (k = 0; k < BAS_INURBS; ++k) {
 965                 rc = usb_unlink_urb(ubc->isoinurbs[k]);
 966                 gig_dbg(DEBUG_ISO,
 967                         "%s: isoc input URB %d unlinked, result = %s",
 968                         __func__, k, get_usb_rcmsg(rc));
 969         }
 970
 971         for (k = 0; k < BAS_OUTURBS; ++k) {
 972                 rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
 973                 gig_dbg(DEBUG_ISO,
 974                         "%s: isoc output URB %d unlinked, result = %s",
 975                         __func__, k, get_usb_rcmsg(rc));
 976         }
 977 }
 978
 979 /* Isochronous Write - Bottom Half */
 980 /* =============================== */
 981
 982 /* submit_iso_write_urb
 983  * fill and submit the next isochronous write URB
 984  * parameters:
 985  *      ucx     context structure containing URB
 986  * return value:
 987  *      number of frames submitted in URB
 988  *      0 if URB not submitted because no data available (isooutbuf busy)
 989  *      error code < 0 on error
 990  */
 991 static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
 992 {
 993         struct urb *urb = ucx->urb;
 994         struct bas_bc_state *ubc = ucx->bcs->hw.bas;
 995         struct usb_iso_packet_descriptor *ifd;
 996         int corrbytes, nframe, rc;
 997
 998         /* urb->dev is clobbered by USB subsystem */
 999         urb->dev = ucx->bcs->cs->hw.bas->udev;
1000         urb->transfer_flags = URB_ISO_ASAP;
1001         urb->transfer_buffer = ubc->isooutbuf->data;
1002         urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1003
1004         for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
1005                 ifd = &urb->iso_frame_desc[nframe];
1006
1007                 /* compute frame length according to flow control */
1008                 ifd->length = BAS_NORMFRAME;
1009                 if ((corrbytes = atomic_read(&ubc->corrbytes)) != 0) {
1010                         gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
1011                                 __func__, corrbytes);
1012                         if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
1013                                 corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
1014                         else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
1015                                 corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
1016                         ifd->length += corrbytes;
1017                         atomic_add(-corrbytes, &ubc->corrbytes);
1018                 }
1019
1020                 /* retrieve block of data to send */
1021                 ifd->offset = gigaset_isowbuf_getbytes(ubc->isooutbuf,
1022                                                        ifd->length);
1023                 if (ifd->offset < 0) {
1024                         if (ifd->offset == -EBUSY) {
1025                                 gig_dbg(DEBUG_ISO,
1026                                         "%s: buffer busy at frame %d",
1027                                         __func__, nframe);
1028                                 /* tasklet will be restarted from
1029                                    gigaset_send_skb() */
1030                         } else {
1031                                 dev_err(ucx->bcs->cs->dev,
1032                                         "%s: buffer error %d at frame %d\n",
1033                                         __func__, ifd->offset, nframe);
1034                                 return ifd->offset;
1035                         }
1036                         break;
1037                 }
1038                 ucx->limit = atomic_read(&ubc->isooutbuf->nextread);
1039                 ifd->status = 0;
1040                 ifd->actual_length = 0;
1041         }
1042         if (unlikely(nframe == 0))
1043                 return 0;       /* no data to send */
1044         urb->number_of_packets = nframe;
1045
1046         rc = usb_submit_urb(urb, SLAB_ATOMIC);
1047         if (unlikely(rc)) {
1048                 if (rc == -ENODEV)
1049                         /* device removed - give up silently */
1050                         gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
1051                 else
1052                         dev_err(ucx->bcs->cs->dev,
1053                                 "could not submit isochronous write URB: %s\n",
1054                                 get_usb_rcmsg(rc));
1055                 return rc;
1056         }
1057         ++ubc->numsub;
1058         return nframe;
1059 }
1060
1061 /* write_iso_tasklet
1062  * tasklet scheduled when an isochronous output URB from the Gigaset device
1063  * has completed
1064  * parameter:
1065  *      data    B channel state structure
1066  */
1067 static void write_iso_tasklet(unsigned long data)
1068 {
1069         struct bc_state *bcs = (struct bc_state *) data;
1070         struct bas_bc_state *ubc = bcs->hw.bas;
1071         struct cardstate *cs = bcs->cs;
1072         struct isow_urbctx_t *done, *next, *ovfl;
1073         struct urb *urb;
1074         struct usb_iso_packet_descriptor *ifd;
1075         int offset;
1076         unsigned long flags;
1077         int i;
1078         struct sk_buff *skb;
1079         int len;
1080         int rc;
1081
1082         /* loop while completed URBs arrive in time */
1083         for (;;) {
1084                 if (unlikely(!(atomic_read(&ubc->running)))) {
1085                         gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1086                         return;
1087                 }
1088
1089                 /* retrieve completed URBs */
1090                 spin_lock_irqsave(&ubc->isooutlock, flags);
1091                 done = ubc->isooutdone;
1092                 ubc->isooutdone = NULL;
1093                 ovfl = ubc->isooutovfl;
1094                 ubc->isooutovfl = NULL;
1095                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1096                 if (ovfl) {
1097                         dev_err(cs->dev, "isochronous write buffer underrun\n");
1098                         error_hangup(bcs);
1099                         break;
1100                 }
1101                 if (!done)
1102                         break;
1103
1104                 /* submit free URB if available */
1105                 spin_lock_irqsave(&ubc->isooutlock, flags);
1106                 next = ubc->isooutfree;
1107                 ubc->isooutfree = NULL;
1108                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1109                 if (next) {
1110                         rc = submit_iso_write_urb(next);
1111                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1112                                 /* could not submit URB, put it back */
1113                                 spin_lock_irqsave(&ubc->isooutlock, flags);
1114                                 if (ubc->isooutfree == NULL) {
1115                                         ubc->isooutfree = next;
1116                                         next = NULL;
1117                                 }
1118                                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1119                                 if (next) {
1120                                         /* couldn't put it back */
1121                                         dev_err(cs->dev,
1122                                               "losing isochronous write URB\n");
1123                                         error_hangup(bcs);
1124                                 }
1125                         }
1126                 }
1127
1128                 /* process completed URB */
1129                 urb = done->urb;
1130                 switch (urb->status) {
1131                 case -EXDEV:                    /* partial completion */
1132                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1133                                 __func__);
1134                         /* fall through - what's the difference anyway? */
1135                 case 0:                         /* normal completion */
1136                         /* inspect individual frames
1137                          * assumptions (for lack of documentation):
1138                          * - actual_length bytes of first frame in error are
1139                          *   successfully sent
1140                          * - all following frames are not sent at all
1141                          */
1142                         offset = done->limit;   /* default (no error) */
1143                         for (i = 0; i < BAS_NUMFRAMES; i++) {
1144                                 ifd = &urb->iso_frame_desc[i];
1145                                 if (ifd->status ||
1146                                     ifd->actual_length != ifd->length) {
1147                                         dev_warn(cs->dev,
1148                                              "isochronous write: frame %d: %s, "
1149                                              "only %d of %d bytes sent\n",
1150                                              i, get_usb_statmsg(ifd->status),
1151                                              ifd->actual_length, ifd->length);
1152                                         offset = (ifd->offset +
1153                                                   ifd->actual_length)
1154                                                  % BAS_OUTBUFSIZE;
1155                                         break;
1156                                 }
1157                         }
1158 #ifdef CONFIG_GIGASET_DEBUG
1159                         /* check assumption on remaining frames */
1160                         for (; i < BAS_NUMFRAMES; i++) {
1161                                 ifd = &urb->iso_frame_desc[i];
1162                                 if (ifd->status != -EINPROGRESS
1163                                     || ifd->actual_length != 0) {
1164                                         dev_warn(cs->dev,
1165                                              "isochronous write: frame %d: %s, "
1166                                              "%d of %d bytes sent\n",
1167                                              i, get_usb_statmsg(ifd->status),
1168                                              ifd->actual_length, ifd->length);
1169                                         offset = (ifd->offset +
1170                                                   ifd->actual_length)
1171                                                  % BAS_OUTBUFSIZE;
1172                                         break;
1173                                 }
1174                         }
1175 #endif
1176                         break;
1177                 case -EPIPE:                    /* stall - probably underrun */
1178                         dev_err(cs->dev, "isochronous write stalled\n");
1179                         error_hangup(bcs);
1180                         break;
1181                 default:                        /* severe trouble */
1182                         dev_warn(cs->dev, "isochronous write: %s\n",
1183                                  get_usb_statmsg(urb->status));
1184                 }
1185
1186                 /* mark the write buffer area covered by this URB as free */
1187                 if (done->limit >= 0)
1188                         atomic_set(&ubc->isooutbuf->read, done->limit);
1189
1190                 /* mark URB as free */
1191                 spin_lock_irqsave(&ubc->isooutlock, flags);
1192                 next = ubc->isooutfree;
1193                 ubc->isooutfree = done;
1194                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1195                 if (next) {
1196                         /* only one URB still active - resubmit one */
1197                         rc = submit_iso_write_urb(next);
1198                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1199                                 /* couldn't submit */
1200                                 error_hangup(bcs);
1201                         }
1202                 }
1203         }
1204
1205         /* process queued SKBs */
1206         while ((skb = skb_dequeue(&bcs->squeue))) {
1207                 /* copy to output buffer, doing L2 encapsulation */
1208                 len = skb->len;
1209                 if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
1210                         /* insufficient buffer space, push back onto queue */
1211                         skb_queue_head(&bcs->squeue, skb);
1212                         gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
1213                                 __func__, skb_queue_len(&bcs->squeue));
1214                         break;
1215                 }
1216                 skb_pull(skb, len);
1217                 gigaset_skb_sent(bcs, skb);
1218                 dev_kfree_skb_any(skb);
1219         }
1220 }
1221
1222 /* Isochronous Read - Bottom Half */
1223 /* ============================== */
1224
1225 /* read_iso_tasklet
1226  * tasklet scheduled when an isochronous input URB from the Gigaset device
1227  * has completed
1228  * parameter:
1229  *      data    B channel state structure
1230  */
1231 static void read_iso_tasklet(unsigned long data)
1232 {
1233         struct bc_state *bcs = (struct bc_state *) data;
1234         struct bas_bc_state *ubc = bcs->hw.bas;
1235         struct cardstate *cs = bcs->cs;
1236         struct urb *urb;
1237         char *rcvbuf;
1238         unsigned long flags;
1239         int totleft, numbytes, offset, frame, rc;
1240
1241         /* loop while more completed URBs arrive in the meantime */
1242         for (;;) {
1243                 /* retrieve URB */
1244                 spin_lock_irqsave(&ubc->isoinlock, flags);
1245                 if (!(urb = ubc->isoindone)) {
1246                         spin_unlock_irqrestore(&ubc->isoinlock, flags);
1247                         return;
1248                 }
1249                 ubc->isoindone = NULL;
1250                 if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1251                         dev_warn(cs->dev,
1252                                  "isochronous read overrun, "
1253                                  "dropped URB with status: %s, %d bytes lost\n",
1254                                  get_usb_statmsg(ubc->loststatus),
1255                                  ubc->isoinlost);
1256                         ubc->loststatus = -EINPROGRESS;
1257                 }
1258                 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1259
1260                 if (unlikely(!(atomic_read(&ubc->running)))) {
1261                         gig_dbg(DEBUG_ISO,
1262                                 "%s: channel not running, "
1263                                 "dropped URB with status: %s",
1264                                 __func__, get_usb_statmsg(urb->status));
1265                         return;
1266                 }
1267
1268                 switch (urb->status) {
1269                 case 0:                         /* normal completion */
1270                         break;
1271                 case -EXDEV:                    /* inspect individual frames
1272                                                    (we do that anyway) */
1273                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1274                                 __func__);
1275                         break;
1276                 case -ENOENT:
1277                 case -ECONNRESET:
1278                 case -EINPROGRESS:
1279                         gig_dbg(DEBUG_ISO, "%s: %s",
1280                                 __func__, get_usb_statmsg(urb->status));
1281                         continue;               /* -> skip */
1282                 case -EPIPE:
1283                         dev_err(cs->dev, "isochronous read stalled\n");
1284                         error_hangup(bcs);
1285                         continue;               /* -> skip */
1286                 default:                        /* severe trouble */
1287                         dev_warn(cs->dev, "isochronous read: %s\n",
1288                                  get_usb_statmsg(urb->status));
1289                         goto error;
1290                 }
1291
1292                 rcvbuf = urb->transfer_buffer;
1293                 totleft = urb->actual_length;
1294                 for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1295                         if (unlikely(urb->iso_frame_desc[frame].status)) {
1296                                 dev_warn(cs->dev,
1297                                          "isochronous read: frame %d: %s\n",
1298                                          frame,
1299                                          get_usb_statmsg(
1300                                             urb->iso_frame_desc[frame].status));
1301                                 break;
1302                         }
1303                         numbytes = urb->iso_frame_desc[frame].actual_length;
1304                         if (unlikely(numbytes > BAS_MAXFRAME)) {
1305                                 dev_warn(cs->dev,
1306                                          "isochronous read: frame %d: "
1307                                          "numbytes (%d) > BAS_MAXFRAME\n",
1308                                          frame, numbytes);
1309                                 break;
1310                         }
1311                         if (unlikely(numbytes > totleft)) {
1312                                 dev_warn(cs->dev,
1313                                          "isochronous read: frame %d: "
1314                                          "numbytes (%d) > totleft (%d)\n",
1315                                          frame, numbytes, totleft);
1316                                 break;
1317                         }
1318                         offset = urb->iso_frame_desc[frame].offset;
1319                         if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1320                                 dev_warn(cs->dev,
1321                                          "isochronous read: frame %d: "
1322                                          "offset (%d) + numbytes (%d) "
1323                                          "> BAS_INBUFSIZE\n",
1324                                          frame, offset, numbytes);
1325                                 break;
1326                         }
1327                         gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1328                         totleft -= numbytes;
1329                 }
1330                 if (unlikely(totleft > 0))
1331                         dev_warn(cs->dev,
1332                                  "isochronous read: %d data bytes missing\n",
1333                                  totleft);
1334
1335         error:
1336                 /* URB processed, resubmit */
1337                 for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1338                         urb->iso_frame_desc[frame].status = 0;
1339                         urb->iso_frame_desc[frame].actual_length = 0;
1340                 }
1341                 /* urb->dev is clobbered by USB subsystem */
1342                 urb->dev = bcs->cs->hw.bas->udev;
1343                 urb->transfer_flags = URB_ISO_ASAP;
1344                 urb->number_of_packets = BAS_NUMFRAMES;
1345                 rc = usb_submit_urb(urb, SLAB_ATOMIC);
1346                 if (unlikely(rc != 0 && rc != -ENODEV)) {
1347                         dev_err(cs->dev,
1348                                 "could not resubmit isochronous read URB: %s\n",
1349                                 get_usb_rcmsg(rc));
1350                         dump_urb(DEBUG_ISO, "resubmit iso read", urb);
1351                         error_hangup(bcs);
1352                 }
1353         }
1354 }
1355
1356 /* Channel Operations */
1357 /* ================== */
1358
1359 /* req_timeout
1360  * timeout routine for control output request
1361  * argument:
1362  *      B channel control structure
1363  */
1364 static void req_timeout(unsigned long data)
1365 {
1366         struct bc_state *bcs = (struct bc_state *) data;
1367         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1368         int pending;
1369         unsigned long flags;
1370
1371         check_pending(ucs);
1372
1373         spin_lock_irqsave(&ucs->lock, flags);
1374         pending = ucs->pending;
1375         ucs->pending = 0;
1376         spin_unlock_irqrestore(&ucs->lock, flags);
1377
1378         switch (pending) {
1379         case 0:                                 /* no pending request */
1380                 gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1381                 break;
1382
1383         case HD_OPEN_ATCHANNEL:
1384                 dev_err(bcs->cs->dev, "timeout opening AT channel\n");
1385                 error_reset(bcs->cs);
1386                 break;
1387
1388         case HD_OPEN_B2CHANNEL:
1389         case HD_OPEN_B1CHANNEL:
1390                 dev_err(bcs->cs->dev, "timeout opening channel %d\n",
1391                         bcs->channel + 1);
1392                 error_hangup(bcs);
1393                 break;
1394
1395         case HD_CLOSE_ATCHANNEL:
1396                 dev_err(bcs->cs->dev, "timeout closing AT channel\n");
1397                 break;
1398
1399         case HD_CLOSE_B2CHANNEL:
1400         case HD_CLOSE_B1CHANNEL:
1401                 dev_err(bcs->cs->dev, "timeout closing channel %d\n",
1402                         bcs->channel + 1);
1403                 error_reset(bcs->cs);
1404                 break;
1405
1406         default:
1407                 dev_warn(bcs->cs->dev, "request 0x%02x timed out, clearing\n",
1408                          pending);
1409         }
1410 }
1411
1412 /* write_ctrl_callback
1413  * USB completion handler for control pipe output
1414  * called by the USB subsystem in interrupt context
1415  * parameter:
1416  *      urb     USB request block of completed request
1417  *              urb->context = hardware specific controller state structure
1418  */
1419 static void write_ctrl_callback(struct urb *urb, struct pt_regs *regs)
1420 {
1421         struct bas_cardstate *ucs = urb->context;
1422         int rc;
1423         unsigned long flags;
1424
1425         /* check status */
1426         switch (urb->status) {
1427         case 0:                                 /* normal completion */
1428                 spin_lock_irqsave(&ucs->lock, flags);
1429                 switch (ucs->pending) {
1430                 case HD_DEVICE_INIT_ACK:        /* no reply expected */
1431                         del_timer(&ucs->timer_ctrl);
1432                         ucs->pending = 0;
1433                         break;
1434                 }
1435                 spin_unlock_irqrestore(&ucs->lock, flags);
1436                 return;
1437
1438         case -ENOENT:                   /* cancelled */
1439         case -ECONNRESET:               /* cancelled (async) */
1440         case -EINPROGRESS:              /* pending */
1441         case -ENODEV:                   /* device removed */
1442         case -ESHUTDOWN:                /* device shut down */
1443                 /* ignore silently */
1444                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1445                         __func__, get_usb_statmsg(urb->status));
1446                 break;
1447
1448         default:                                /* any failure */
1449                 if (++ucs->retry_ctrl > BAS_RETRY) {
1450                         dev_err(&ucs->interface->dev,
1451                                 "control request 0x%02x failed: %s\n",
1452                                 ucs->dr_ctrl.bRequest,
1453                                 get_usb_statmsg(urb->status));
1454                         break;          /* give up */
1455                 }
1456                 dev_notice(&ucs->interface->dev,
1457                            "control request 0x%02x: %s, retry %d\n",
1458                            ucs->dr_ctrl.bRequest, get_usb_statmsg(urb->status),
1459                            ucs->retry_ctrl);
1460                 /* urb->dev is clobbered by USB subsystem */
1461                 urb->dev = ucs->udev;
1462                 rc = usb_submit_urb(urb, SLAB_ATOMIC);
1463                 if (unlikely(rc)) {
1464                         dev_err(&ucs->interface->dev,
1465                                 "could not resubmit request 0x%02x: %s\n",
1466                                 ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
1467                         break;
1468                 }
1469                 /* resubmitted */
1470                 return;
1471         }
1472
1473         /* failed, clear pending request */
1474         spin_lock_irqsave(&ucs->lock, flags);
1475         del_timer(&ucs->timer_ctrl);
1476         ucs->pending = 0;
1477         spin_unlock_irqrestore(&ucs->lock, flags);
1478 }
1479
1480 /* req_submit
1481  * submit a control output request without message buffer to the Gigaset base
1482  * and optionally start a timeout
1483  * parameters:
1484  *      bcs     B channel control structure
1485  *      req     control request code (HD_*)
1486  *      val     control request parameter value (set to 0 if unused)
1487  *      timeout timeout in seconds (0: no timeout)
1488  * return value:
1489  *      0 on success
1490  *      -EBUSY if another request is pending
1491  *      any URB submission error code
1492  */
1493 static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1494 {
1495         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1496         int ret;
1497         unsigned long flags;
1498
1499         gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1500
1501         spin_lock_irqsave(&ucs->lock, flags);
1502         if (ucs->pending) {
1503                 spin_unlock_irqrestore(&ucs->lock, flags);
1504                 dev_err(bcs->cs->dev,
1505                         "submission of request 0x%02x failed: "
1506                         "request 0x%02x still pending\n",
1507                         req, ucs->pending);
1508                 return -EBUSY;
1509         }
1510
1511         ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1512         ucs->dr_ctrl.bRequest = req;
1513         ucs->dr_ctrl.wValue = cpu_to_le16(val);
1514         ucs->dr_ctrl.wIndex = 0;
1515         ucs->dr_ctrl.wLength = 0;
1516         usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1517                              usb_sndctrlpipe(ucs->udev, 0),
1518                              (unsigned char*) &ucs->dr_ctrl, NULL, 0,
1519                              write_ctrl_callback, ucs);
1520         ucs->retry_ctrl = 0;
1521         ret = usb_submit_urb(ucs->urb_ctrl, SLAB_ATOMIC);
1522         if (unlikely(ret)) {
1523                 dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1524                         req, get_usb_rcmsg(ret));
1525                 spin_unlock_irqrestore(&ucs->lock, flags);
1526                 return ret;
1527         }
1528         ucs->pending = req;
1529
1530         if (timeout > 0) {
1531                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1532                 ucs->timer_ctrl.expires = jiffies + timeout * HZ / 10;
1533                 ucs->timer_ctrl.data = (unsigned long) bcs;
1534                 ucs->timer_ctrl.function = req_timeout;
1535                 add_timer(&ucs->timer_ctrl);
1536         }
1537
1538         spin_unlock_irqrestore(&ucs->lock, flags);
1539         return 0;
1540 }
1541
1542 /* gigaset_init_bchannel
1543  * called by common.c to connect a B channel
1544  * initialize isochronous I/O and tell the Gigaset base to open the channel
1545  * argument:
1546  *      B channel control structure
1547  * return value:
1548  *      0 on success, error code < 0 on error
1549  */
1550 static int gigaset_init_bchannel(struct bc_state *bcs)
1551 {
1552         int req, ret;
1553         unsigned long flags;
1554
1555         spin_lock_irqsave(&bcs->cs->lock, flags);
1556         if (unlikely(!bcs->cs->connected)) {
1557                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1558                 spin_unlock_irqrestore(&bcs->cs->lock, flags);
1559                 return -ENODEV;
1560         }
1561
1562         if ((ret = starturbs(bcs)) < 0) {
1563                 dev_err(bcs->cs->dev,
1564                         "could not start isochronous I/O for channel B%d: %s\n",
1565                         bcs->channel + 1,
1566                         ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
1567                 if (ret != -ENODEV)
1568                         error_hangup(bcs);
1569                 spin_unlock_irqrestore(&bcs->cs->lock, flags);
1570                 return ret;
1571         }
1572
1573         req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1574         if ((ret = req_submit(bcs, req, 0, BAS_TIMEOUT)) < 0) {
1575                 dev_err(bcs->cs->dev, "could not open channel B%d\n",
1576                         bcs->channel + 1);
1577                 stopurbs(bcs->hw.bas);
1578                 if (ret != -ENODEV)
1579                         error_hangup(bcs);
1580         }
1581
1582         spin_unlock_irqrestore(&bcs->cs->lock, flags);
1583         return ret;
1584 }
1585
1586 /* gigaset_close_bchannel
1587  * called by common.c to disconnect a B channel
1588  * tell the Gigaset base to close the channel
1589  * stopping isochronous I/O and LL notification will be done when the
1590  * acknowledgement for the close arrives
1591  * argument:
1592  *      B channel control structure
1593  * return value:
1594  *      0 on success, error code < 0 on error
1595  */
1596 static int gigaset_close_bchannel(struct bc_state *bcs)
1597 {
1598         int req, ret;
1599         unsigned long flags;
1600
1601         spin_lock_irqsave(&bcs->cs->lock, flags);
1602         if (unlikely(!bcs->cs->connected)) {
1603                 spin_unlock_irqrestore(&bcs->cs->lock, flags);
1604                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1605                 return -ENODEV;
1606         }
1607
1608         if (!(atomic_read(&bcs->cs->hw.bas->basstate) &
1609               (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1610                 /* channel not running: just signal common.c */
1611                 spin_unlock_irqrestore(&bcs->cs->lock, flags);
1612                 gigaset_bchannel_down(bcs);
1613                 return 0;
1614         }
1615
1616         /* channel running: tell device to close it */
1617         req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1618         if ((ret = req_submit(bcs, req, 0, BAS_TIMEOUT)) < 0)
1619                 dev_err(bcs->cs->dev, "closing channel B%d failed\n",
1620                         bcs->channel + 1);
1621
1622         spin_unlock_irqrestore(&bcs->cs->lock, flags);
1623         return ret;
1624 }
1625
1626 /* Device Operations */
1627 /* ================= */
1628
1629 /* complete_cb
1630  * unqueue first command buffer from queue, waking any sleepers
1631  * must be called with cs->cmdlock held
1632  * parameter:
1633  *      cs      controller state structure
1634  */
1635 static void complete_cb(struct cardstate *cs)
1636 {
1637         struct cmdbuf_t *cb = cs->cmdbuf;
1638
1639         /* unqueue completed buffer */
1640         cs->cmdbytes -= cs->curlen;
1641         gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD,
1642                 "write_command: sent %u bytes, %u left",
1643                 cs->curlen, cs->cmdbytes);
1644         if ((cs->cmdbuf = cb->next) != NULL) {
1645                 cs->cmdbuf->prev = NULL;
1646                 cs->curlen = cs->cmdbuf->len;
1647         } else {
1648                 cs->lastcmdbuf = NULL;
1649                 cs->curlen = 0;
1650         }
1651
1652         if (cb->wake_tasklet)
1653                 tasklet_schedule(cb->wake_tasklet);
1654
1655         kfree(cb);
1656 }
1657
1658 /* write_command_callback
1659  * USB completion handler for AT command transmission
1660  * called by the USB subsystem in interrupt context
1661  * parameter:
1662  *      urb     USB request block of completed request
1663  *              urb->context = controller state structure
1664  */
1665 static void write_command_callback(struct urb *urb, struct pt_regs *regs)
1666 {
1667         struct cardstate *cs = urb->context;
1668         struct bas_cardstate *ucs = cs->hw.bas;
1669         unsigned long flags;
1670
1671         update_basstate(ucs, 0, BS_ATWRPEND);
1672
1673         /* check status */
1674         switch (urb->status) {
1675         case 0:                                 /* normal completion */
1676                 break;
1677         case -ENOENT:                   /* cancelled */
1678         case -ECONNRESET:               /* cancelled (async) */
1679         case -EINPROGRESS:              /* pending */
1680         case -ENODEV:                   /* device removed */
1681         case -ESHUTDOWN:                /* device shut down */
1682                 /* ignore silently */
1683                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1684                         __func__, get_usb_statmsg(urb->status));
1685                 return;
1686         default:                                /* any failure */
1687                 if (++ucs->retry_cmd_out > BAS_RETRY) {
1688                         dev_warn(cs->dev,
1689                                  "command write: %s, "
1690                                  "giving up after %d retries\n",
1691                                  get_usb_statmsg(urb->status),
1692                                  ucs->retry_cmd_out);
1693                         break;
1694                 }
1695                 if (cs->cmdbuf == NULL) {
1696                         dev_warn(cs->dev,
1697                                  "command write: %s, "
1698                                  "cannot retry - cmdbuf gone\n",
1699                                  get_usb_statmsg(urb->status));
1700                         break;
1701                 }
1702                 dev_notice(cs->dev, "command write: %s, retry %d\n",
1703                            get_usb_statmsg(urb->status), ucs->retry_cmd_out);
1704                 if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1705                         /* resubmitted - bypass regular exit block */
1706                         return;
1707                 /* command send failed, assume base still waiting */
1708                 update_basstate(ucs, BS_ATREADY, 0);
1709         }
1710
1711         spin_lock_irqsave(&cs->cmdlock, flags);
1712         if (cs->cmdbuf != NULL)
1713                 complete_cb(cs);
1714         spin_unlock_irqrestore(&cs->cmdlock, flags);
1715 }
1716
1717 /* atrdy_timeout
1718  * timeout routine for AT command transmission
1719  * argument:
1720  *      controller state structure
1721  */
1722 static void atrdy_timeout(unsigned long data)
1723 {
1724         struct cardstate *cs = (struct cardstate *) data;
1725         struct bas_cardstate *ucs = cs->hw.bas;
1726
1727         dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1728
1729         /* fake the missing signal - what else can I do? */
1730         update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1731         start_cbsend(cs);
1732 }
1733
1734 /* atwrite_submit
1735  * submit an HD_WRITE_ATMESSAGE command URB
1736  * parameters:
1737  *      cs      controller state structure
1738  *      buf     buffer containing command to send
1739  *      len     length of command to send
1740  * return value:
1741  *      0 on success
1742  *      -EBUSY if another request is pending
1743  *      any URB submission error code
1744  */
1745 static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1746 {
1747         struct bas_cardstate *ucs = cs->hw.bas;
1748         int rc;
1749
1750         gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1751
1752         if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1753                 dev_err(cs->dev,
1754                         "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1755                 return -EBUSY;
1756         }
1757
1758         ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1759         ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1760         ucs->dr_cmd_out.wValue = 0;
1761         ucs->dr_cmd_out.wIndex = 0;
1762         ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1763         usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1764                              usb_sndctrlpipe(ucs->udev, 0),
1765                              (unsigned char*) &ucs->dr_cmd_out, buf, len,
1766                              write_command_callback, cs);
1767         rc = usb_submit_urb(ucs->urb_cmd_out, SLAB_ATOMIC);
1768         if (unlikely(rc)) {
1769                 update_basstate(ucs, 0, BS_ATWRPEND);
1770                 dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1771                         get_usb_rcmsg(rc));
1772                 return rc;
1773         }
1774
1775         /* submitted successfully, start timeout if necessary */
1776         if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1777                 gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
1778                         ATRDY_TIMEOUT);
1779                 ucs->timer_atrdy.expires = jiffies + ATRDY_TIMEOUT * HZ / 10;
1780                 ucs->timer_atrdy.data = (unsigned long) cs;
1781                 ucs->timer_atrdy.function = atrdy_timeout;
1782                 add_timer(&ucs->timer_atrdy);
1783         }
1784         return 0;
1785 }
1786
1787 /* start_cbsend
1788  * start transmission of AT command queue if necessary
1789  * parameter:
1790  *      cs              controller state structure
1791  * return value:
1792  *      0 on success
1793  *      error code < 0 on error
1794  */
1795 static int start_cbsend(struct cardstate *cs)
1796 {
1797         struct cmdbuf_t *cb;
1798         struct bas_cardstate *ucs = cs->hw.bas;
1799         unsigned long flags;
1800         int rc;
1801         int retval = 0;
1802
1803         /* check if AT channel is open */
1804         if (!(atomic_read(&ucs->basstate) & BS_ATOPEN)) {
1805                 gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "AT channel not open");
1806                 rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1807                 if (rc < 0) {
1808                         /* flush command queue */
1809                         spin_lock_irqsave(&cs->cmdlock, flags);
1810                         while (cs->cmdbuf != NULL)
1811                                 complete_cb(cs);
1812                         spin_unlock_irqrestore(&cs->cmdlock, flags);
1813                 }
1814                 return rc;
1815         }
1816
1817         /* try to send first command in queue */
1818         spin_lock_irqsave(&cs->cmdlock, flags);
1819
1820         while ((cb = cs->cmdbuf) != NULL &&
1821                atomic_read(&ucs->basstate) & BS_ATREADY) {
1822                 ucs->retry_cmd_out = 0;
1823                 rc = atwrite_submit(cs, cb->buf, cb->len);
1824                 if (unlikely(rc)) {
1825                         retval = rc;
1826                         complete_cb(cs);
1827                 }
1828         }
1829
1830         spin_unlock_irqrestore(&cs->cmdlock, flags);
1831         return retval;
1832 }
1833
1834 /* gigaset_write_cmd
1835  * This function is called by the device independent part of the driver
1836  * to transmit an AT command string to the Gigaset device.
1837  * It encapsulates the device specific method for transmission over the
1838  * direct USB connection to the base.
1839  * The command string is added to the queue of commands to send, and
1840  * USB transmission is started if necessary.
1841  * parameters:
1842  *      cs              controller state structure
1843  *      buf             command string to send
1844  *      len             number of bytes to send (max. IF_WRITEBUF)
1845  *      wake_tasklet    tasklet to run when transmission is completed
1846  *                      (NULL if none)
1847  * return value:
1848  *      number of bytes queued on success
1849  *      error code < 0 on error
1850  */
1851 static int gigaset_write_cmd(struct cardstate *cs,
1852                              const unsigned char *buf, int len,
1853                              struct tasklet_struct *wake_tasklet)
1854 {
1855         struct cmdbuf_t *cb;
1856         unsigned long flags;
1857         int status;
1858
1859         gigaset_dbg_buffer(atomic_read(&cs->mstate) != MS_LOCKED ?
1860                              DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1861                            "CMD Transmit", len, buf);
1862
1863         if (len <= 0)
1864                 return 0;                       /* nothing to do */
1865
1866         if (len > IF_WRITEBUF)
1867                 len = IF_WRITEBUF;
1868         if (!(cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC))) {
1869                 dev_err(cs->dev, "%s: out of memory\n", __func__);
1870                 return -ENOMEM;
1871         }
1872
1873         memcpy(cb->buf, buf, len);
1874         cb->len = len;
1875         cb->offset = 0;
1876         cb->next = NULL;
1877         cb->wake_tasklet = wake_tasklet;
1878
1879         spin_lock_irqsave(&cs->cmdlock, flags);
1880         cb->prev = cs->lastcmdbuf;
1881         if (cs->lastcmdbuf)
1882                 cs->lastcmdbuf->next = cb;
1883         else {
1884                 cs->cmdbuf = cb;
1885                 cs->curlen = len;
1886         }
1887         cs->cmdbytes += len;
1888         cs->lastcmdbuf = cb;
1889         spin_unlock_irqrestore(&cs->cmdlock, flags);
1890
1891         spin_lock_irqsave(&cs->lock, flags);
1892         if (unlikely(!cs->connected)) {
1893                 spin_unlock_irqrestore(&cs->lock, flags);
1894                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1895                 return -ENODEV;
1896         }
1897         status = start_cbsend(cs);
1898         spin_unlock_irqrestore(&cs->lock, flags);
1899         return status < 0 ? status : len;
1900 }
1901
1902 /* gigaset_write_room
1903  * tty_driver.write_room interface routine
1904  * return number of characters the driver will accept to be written via
1905  * gigaset_write_cmd
1906  * parameter:
1907  *      controller state structure
1908  * return value:
1909  *      number of characters
1910  */
1911 static int gigaset_write_room(struct cardstate *cs)
1912 {
1913         return IF_WRITEBUF;
1914 }
1915
1916 /* gigaset_chars_in_buffer
1917  * tty_driver.chars_in_buffer interface routine
1918  * return number of characters waiting to be sent
1919  * parameter:
1920  *      controller state structure
1921  * return value:
1922  *      number of characters
1923  */
1924 static int gigaset_chars_in_buffer(struct cardstate *cs)
1925 {
1926         unsigned long flags;
1927         unsigned bytes;
1928
1929         spin_lock_irqsave(&cs->cmdlock, flags);
1930         bytes = cs->cmdbytes;
1931         spin_unlock_irqrestore(&cs->cmdlock, flags);
1932
1933         return bytes;
1934 }
1935
1936 /* gigaset_brkchars
1937  * implementation of ioctl(GIGASET_BRKCHARS)
1938  * parameter:
1939  *      controller state structure
1940  * return value:
1941  *      -EINVAL (unimplemented function)
1942  */
1943 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
1944 {
1945         return -EINVAL;
1946 }
1947
1948
1949 /* Device Initialization/Shutdown */
1950 /* ============================== */
1951
1952 /* Free hardware dependent part of the B channel structure
1953  * parameter:
1954  *      bcs     B channel structure
1955  * return value:
1956  *      !=0 on success
1957  */
1958 static int gigaset_freebcshw(struct bc_state *bcs)
1959 {
1960         struct bas_bc_state *ubc = bcs->hw.bas;
1961         int i;
1962
1963         if (!ubc)
1964                 return 0;
1965
1966         /* kill URBs and tasklets before freeing - better safe than sorry */
1967         atomic_set(&ubc->running, 0);
1968         for (i = 0; i < BAS_OUTURBS; ++i)
1969                 if (ubc->isoouturbs[i].urb) {
1970                         gig_dbg(DEBUG_INIT, "%s: killing iso out URB %d",
1971                                 __func__, i);
1972                         usb_kill_urb(ubc->isoouturbs[i].urb);
1973                         usb_free_urb(ubc->isoouturbs[i].urb);
1974                 }
1975         for (i = 0; i < BAS_INURBS; ++i)
1976                 if (ubc->isoinurbs[i]) {
1977                         gig_dbg(DEBUG_INIT, "%s: killing iso in URB %d",
1978                                 __func__, i);
1979                         usb_kill_urb(ubc->isoinurbs[i]);
1980                         usb_free_urb(ubc->isoinurbs[i]);
1981                 }
1982         tasklet_kill(&ubc->sent_tasklet);
1983         tasklet_kill(&ubc->rcvd_tasklet);
1984         kfree(ubc->isooutbuf);
1985         kfree(ubc);
1986         bcs->hw.bas = NULL;
1987         return 1;
1988 }
1989
1990 /* Initialize hardware dependent part of the B channel structure
1991  * parameter:
1992  *      bcs     B channel structure
1993  * return value:
1994  *      !=0 on success
1995  */
1996 static int gigaset_initbcshw(struct bc_state *bcs)
1997 {
1998         int i;
1999         struct bas_bc_state *ubc;
2000
2001         bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
2002         if (!ubc) {
2003                 err("could not allocate bas_bc_state");
2004                 return 0;
2005         }
2006
2007         atomic_set(&ubc->running, 0);
2008         atomic_set(&ubc->corrbytes, 0);
2009         spin_lock_init(&ubc->isooutlock);
2010         for (i = 0; i < BAS_OUTURBS; ++i) {
2011                 ubc->isoouturbs[i].urb = NULL;
2012                 ubc->isoouturbs[i].bcs = bcs;
2013         }
2014         ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
2015         ubc->numsub = 0;
2016         if (!(ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL))) {
2017                 err("could not allocate isochronous output buffer");
2018                 kfree(ubc);
2019                 bcs->hw.bas = NULL;
2020                 return 0;
2021         }
2022         tasklet_init(&ubc->sent_tasklet,
2023                      &write_iso_tasklet, (unsigned long) bcs);
2024
2025         spin_lock_init(&ubc->isoinlock);
2026         for (i = 0; i < BAS_INURBS; ++i)
2027                 ubc->isoinurbs[i] = NULL;
2028         ubc->isoindone = NULL;
2029         ubc->loststatus = -EINPROGRESS;
2030         ubc->isoinlost = 0;
2031         ubc->seqlen = 0;
2032         ubc->inbyte = 0;
2033         ubc->inbits = 0;
2034         ubc->goodbytes = 0;
2035         ubc->alignerrs = 0;
2036         ubc->fcserrs = 0;
2037         ubc->frameerrs = 0;
2038         ubc->giants = 0;
2039         ubc->runts = 0;
2040         ubc->aborts = 0;
2041         ubc->shared0s = 0;
2042         ubc->stolen0s = 0;
2043         tasklet_init(&ubc->rcvd_tasklet,
2044                      &read_iso_tasklet, (unsigned long) bcs);
2045         return 1;
2046 }
2047
2048 static void gigaset_reinitbcshw(struct bc_state *bcs)
2049 {
2050         struct bas_bc_state *ubc = bcs->hw.bas;
2051
2052         atomic_set(&bcs->hw.bas->running, 0);
2053         atomic_set(&bcs->hw.bas->corrbytes, 0);
2054         bcs->hw.bas->numsub = 0;
2055         spin_lock_init(&ubc->isooutlock);
2056         spin_lock_init(&ubc->isoinlock);
2057         ubc->loststatus = -EINPROGRESS;
2058 }
2059
2060 static void gigaset_freecshw(struct cardstate *cs)
2061 {
2062         /* timers, URBs and rcvbuf are disposed of in disconnect */
2063         kfree(cs->hw.bas);
2064         cs->hw.bas = NULL;
2065 }
2066
2067 static int gigaset_initcshw(struct cardstate *cs)
2068 {
2069         struct bas_cardstate *ucs;
2070
2071         cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
2072         if (!ucs)
2073                 return 0;
2074
2075         ucs->urb_cmd_in = NULL;
2076         ucs->urb_cmd_out = NULL;
2077         ucs->rcvbuf = NULL;
2078         ucs->rcvbuf_size = 0;
2079
2080         spin_lock_init(&ucs->lock);
2081         ucs->pending = 0;
2082
2083         atomic_set(&ucs->basstate, 0);
2084         init_timer(&ucs->timer_ctrl);
2085         init_timer(&ucs->timer_atrdy);
2086         init_timer(&ucs->timer_cmd_in);
2087
2088         return 1;
2089 }
2090
2091 /* freeurbs
2092  * unlink and deallocate all URBs unconditionally
2093  * caller must make sure that no commands are still in progress
2094  * parameter:
2095  *      cs      controller state structure
2096  */
2097 static void freeurbs(struct cardstate *cs)
2098 {
2099         struct bas_cardstate *ucs = cs->hw.bas;
2100         struct bas_bc_state *ubc;
2101         int i, j;
2102
2103         for (j = 0; j < 2; ++j) {
2104                 ubc = cs->bcs[j].hw.bas;
2105                 for (i = 0; i < BAS_OUTURBS; ++i)
2106                         if (ubc->isoouturbs[i].urb) {
2107                                 usb_kill_urb(ubc->isoouturbs[i].urb);
2108                                 gig_dbg(DEBUG_INIT,
2109                                         "%s: isoc output URB %d/%d unlinked",
2110                                         __func__, j, i);
2111                                 usb_free_urb(ubc->isoouturbs[i].urb);
2112                                 ubc->isoouturbs[i].urb = NULL;
2113                         }
2114                 for (i = 0; i < BAS_INURBS; ++i)
2115                         if (ubc->isoinurbs[i]) {
2116                                 usb_kill_urb(ubc->isoinurbs[i]);
2117                                 gig_dbg(DEBUG_INIT,
2118                                         "%s: isoc input URB %d/%d unlinked",
2119                                         __func__, j, i);
2120                                 usb_free_urb(ubc->isoinurbs[i]);
2121                                 ubc->isoinurbs[i] = NULL;
2122                         }
2123         }
2124         if (ucs->urb_int_in) {
2125                 usb_kill_urb(ucs->urb_int_in);
2126                 gig_dbg(DEBUG_INIT, "%s: interrupt input URB unlinked",
2127                         __func__);
2128                 usb_free_urb(ucs->urb_int_in);
2129                 ucs->urb_int_in = NULL;
2130         }
2131         if (ucs->urb_cmd_out) {
2132                 usb_kill_urb(ucs->urb_cmd_out);
2133                 gig_dbg(DEBUG_INIT, "%s: command output URB unlinked",
2134                         __func__);
2135                 usb_free_urb(ucs->urb_cmd_out);
2136                 ucs->urb_cmd_out = NULL;
2137         }
2138         if (ucs->urb_cmd_in) {
2139                 usb_kill_urb(ucs->urb_cmd_in);
2140                 gig_dbg(DEBUG_INIT, "%s: command input URB unlinked",
2141                         __func__);
2142                 usb_free_urb(ucs->urb_cmd_in);
2143                 ucs->urb_cmd_in = NULL;
2144         }
2145         if (ucs->urb_ctrl) {
2146                 usb_kill_urb(ucs->urb_ctrl);
2147                 gig_dbg(DEBUG_INIT, "%s: control output URB unlinked",
2148                         __func__);
2149                 usb_free_urb(ucs->urb_ctrl);
2150                 ucs->urb_ctrl = NULL;
2151         }
2152 }
2153
2154 /* gigaset_probe
2155  * This function is called when a new USB device is connected.
2156  * It checks whether the new device is handled by this driver.
2157  */
2158 static int gigaset_probe(struct usb_interface *interface,
2159                          const struct usb_device_id *id)
2160 {
2161         struct usb_host_interface *hostif;
2162         struct usb_device *udev = interface_to_usbdev(interface);
2163         struct cardstate *cs = NULL;
2164         struct bas_cardstate *ucs = NULL;
2165         struct bas_bc_state *ubc;
2166         struct usb_endpoint_descriptor *endpoint;
2167         int i, j;
2168         int rc;
2169
2170         gig_dbg(DEBUG_ANY,
2171                 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2172                 __func__, le16_to_cpu(udev->descriptor.idVendor),
2173                 le16_to_cpu(udev->descriptor.idProduct));
2174
2175         /* set required alternate setting */
2176         hostif = interface->cur_altsetting;
2177         if (hostif->desc.bAlternateSetting != 3) {
2178                 gig_dbg(DEBUG_ANY,
2179                         "%s: wrong alternate setting %d - trying to switch",
2180                         __func__, hostif->desc.bAlternateSetting);
2181                 if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3) < 0) {
2182                         dev_warn(&udev->dev, "usb_set_interface failed, "
2183                                  "device %d interface %d altsetting %d\n",
2184                                  udev->devnum, hostif->desc.bInterfaceNumber,
2185                                  hostif->desc.bAlternateSetting);
2186                         return -ENODEV;
2187                 }
2188                 hostif = interface->cur_altsetting;
2189         }
2190
2191         /* Reject application specific interfaces
2192          */
2193         if (hostif->desc.bInterfaceClass != 255) {
2194                 dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
2195                          __func__, hostif->desc.bInterfaceClass);
2196                 return -ENODEV;
2197         }
2198
2199         dev_info(&udev->dev,
2200                  "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
2201                  __func__, le16_to_cpu(udev->descriptor.idVendor),
2202                  le16_to_cpu(udev->descriptor.idProduct));
2203
2204         cs = gigaset_getunassignedcs(driver);
2205         if (!cs) {
2206                 dev_err(&udev->dev, "no free cardstate\n");
2207                 return -ENODEV;
2208         }
2209         ucs = cs->hw.bas;
2210
2211         /* save off device structure ptrs for later use */
2212         usb_get_dev(udev);
2213         ucs->udev = udev;
2214         ucs->interface = interface;
2215         cs->dev = &interface->dev;
2216
2217         /* allocate URBs:
2218          * - one for the interrupt pipe
2219          * - three for the different uses of the default control pipe
2220          * - three for each isochronous pipe
2221          */
2222         if (!(ucs->urb_int_in = usb_alloc_urb(0, SLAB_KERNEL)) ||
2223             !(ucs->urb_cmd_in = usb_alloc_urb(0, SLAB_KERNEL)) ||
2224             !(ucs->urb_cmd_out = usb_alloc_urb(0, SLAB_KERNEL)) ||
2225             !(ucs->urb_ctrl = usb_alloc_urb(0, SLAB_KERNEL)))
2226                 goto allocerr;
2227
2228         for (j = 0; j < 2; ++j) {
2229                 ubc = cs->bcs[j].hw.bas;
2230                 for (i = 0; i < BAS_OUTURBS; ++i)
2231                         if (!(ubc->isoouturbs[i].urb =
2232                               usb_alloc_urb(BAS_NUMFRAMES, SLAB_KERNEL)))
2233                                 goto allocerr;
2234                 for (i = 0; i < BAS_INURBS; ++i)
2235                         if (!(ubc->isoinurbs[i] =
2236                               usb_alloc_urb(BAS_NUMFRAMES, SLAB_KERNEL)))
2237                                 goto allocerr;
2238         }
2239
2240         ucs->rcvbuf = NULL;
2241         ucs->rcvbuf_size = 0;
2242
2243         /* Fill the interrupt urb and send it to the core */
2244         endpoint = &hostif->endpoint[0].desc;
2245         usb_fill_int_urb(ucs->urb_int_in, udev,
2246                          usb_rcvintpipe(udev,
2247                                         (endpoint->bEndpointAddress) & 0x0f),
2248                          ucs->int_in_buf, 3, read_int_callback, cs,
2249                          endpoint->bInterval);
2250         if ((rc = usb_submit_urb(ucs->urb_int_in, SLAB_KERNEL)) != 0) {
2251                 dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2252                         get_usb_rcmsg(rc));
2253                 goto error;
2254         }
2255
2256         /* tell the device that the driver is ready */
2257         if ((rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0)) != 0)
2258                 goto error;
2259
2260         /* tell common part that the device is ready */
2261         if (startmode == SM_LOCKED)
2262                 atomic_set(&cs->mstate, MS_LOCKED);
2263
2264         /* save address of controller structure */
2265         usb_set_intfdata(interface, cs);
2266
2267         if (!gigaset_start(cs))
2268                 goto error;
2269
2270         return 0;
2271
2272 allocerr:
2273         dev_err(cs->dev, "could not allocate URBs\n");
2274 error:
2275         freeurbs(cs);
2276         usb_set_intfdata(interface, NULL);
2277         gigaset_unassign(cs);
2278         return -ENODEV;
2279 }
2280
2281 /* gigaset_disconnect
2282  * This function is called when the Gigaset base is unplugged.
2283  */
2284 static void gigaset_disconnect(struct usb_interface *interface)
2285 {
2286         struct cardstate *cs;
2287         struct bas_cardstate *ucs;
2288         int j;
2289
2290         cs = usb_get_intfdata(interface);
2291
2292         ucs = cs->hw.bas;
2293
2294         dev_info(cs->dev, "disconnecting Gigaset base\n");
2295
2296         /* mark base as not ready, all channels disconnected */
2297         atomic_set(&ucs->basstate, 0);
2298
2299         /* tell LL all channels are down */
2300         //FIXME shouldn't gigaset_stop() do this?
2301         for (j = 0; j < 2; ++j)
2302                 gigaset_bchannel_down(cs->bcs + j);
2303
2304         /* stop driver (common part) */
2305         gigaset_stop(cs);
2306
2307         /* stop timers and URBs, free ressources */
2308         del_timer_sync(&ucs->timer_ctrl);
2309         del_timer_sync(&ucs->timer_atrdy);
2310         del_timer_sync(&ucs->timer_cmd_in);
2311         freeurbs(cs);
2312         usb_set_intfdata(interface, NULL);
2313         kfree(ucs->rcvbuf);
2314         ucs->rcvbuf = NULL;
2315         ucs->rcvbuf_size = 0;
2316         usb_put_dev(ucs->udev);
2317         ucs->interface = NULL;
2318         ucs->udev = NULL;
2319         cs->dev = NULL;
2320         gigaset_unassign(cs);
2321 }
2322
2323 static struct gigaset_ops gigops = {
2324         gigaset_write_cmd,
2325         gigaset_write_room,
2326         gigaset_chars_in_buffer,
2327         gigaset_brkchars,
2328         gigaset_init_bchannel,
2329         gigaset_close_bchannel,
2330         gigaset_initbcshw,
2331         gigaset_freebcshw,
2332         gigaset_reinitbcshw,
2333         gigaset_initcshw,
2334         gigaset_freecshw,
2335         gigaset_set_modem_ctrl,
2336         gigaset_baud_rate,
2337         gigaset_set_line_ctrl,
2338         gigaset_isoc_send_skb,
2339         gigaset_isoc_input,
2340 };
2341
2342 /* bas_gigaset_init
2343  * This function is called after the kernel module is loaded.
2344  */
2345 static int __init bas_gigaset_init(void)
2346 {
2347         int result;
2348
2349         /* allocate memory for our driver state and intialize it */
2350         if ((driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2351                                        GIGASET_MODULENAME, GIGASET_DEVNAME,
2352                                        GIGASET_DEVFSNAME, &gigops,
2353                                        THIS_MODULE)) == NULL)
2354                 goto error;
2355
2356         /* allocate memory for our device state and intialize it */
2357         cardstate = gigaset_initcs(driver, 2, 0, 0, cidmode,
2358                                    GIGASET_MODULENAME);
2359         if (!cardstate)
2360                 goto error;
2361
2362         /* register this driver with the USB subsystem */
2363         result = usb_register(&gigaset_usb_driver);
2364         if (result < 0) {
2365                 err("usb_register failed (error %d)", -result);
2366                 goto error;
2367         }
2368
2369         info(DRIVER_AUTHOR);
2370         info(DRIVER_DESC);
2371         return 0;
2372
2373 error:  if (cardstate)
2374                 gigaset_freecs(cardstate);
2375         cardstate = NULL;
2376         if (driver)
2377                 gigaset_freedriver(driver);
2378         driver = NULL;
2379         return -1;
2380 }
2381
2382 /* bas_gigaset_exit
2383  * This function is called before the kernel module is unloaded.
2384  */
2385 static void __exit bas_gigaset_exit(void)
2386 {
2387         struct bas_cardstate *ucs = cardstate->hw.bas;
2388
2389         gigaset_blockdriver(driver); /* => probe will fail
2390                                       * => no gigaset_start any more
2391                                       */
2392
2393         gigaset_shutdown(cardstate);
2394         /* from now on, no isdn callback should be possible */
2395
2396         /* close all still open channels */
2397         if (atomic_read(&ucs->basstate) & BS_B1OPEN) {
2398                 gig_dbg(DEBUG_INIT, "closing B1 channel");
2399                 usb_control_msg(ucs->udev, usb_sndctrlpipe(ucs->udev, 0),
2400                                 HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ, 0, 0,
2401                                 NULL, 0, BAS_TIMEOUT);
2402         }
2403         if (atomic_read(&ucs->basstate) & BS_B2OPEN) {
2404                 gig_dbg(DEBUG_INIT, "closing B2 channel");
2405                 usb_control_msg(ucs->udev, usb_sndctrlpipe(ucs->udev, 0),
2406                                 HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ, 0, 0,
2407                                 NULL, 0, BAS_TIMEOUT);
2408         }
2409         if (atomic_read(&ucs->basstate) & BS_ATOPEN) {
2410                 gig_dbg(DEBUG_INIT, "closing AT channel");
2411                 usb_control_msg(ucs->udev, usb_sndctrlpipe(ucs->udev, 0),
2412                                 HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ, 0, 0,
2413                                 NULL, 0, BAS_TIMEOUT);
2414         }
2415         atomic_set(&ucs->basstate, 0);
2416
2417         /* deregister this driver with the USB subsystem */
2418         usb_deregister(&gigaset_usb_driver);
2419         /* this will call the disconnect-callback */
2420         /* from now on, no disconnect/probe callback should be running */
2421
2422         gigaset_freecs(cardstate);
2423         cardstate = NULL;
2424         gigaset_freedriver(driver);
2425         driver = NULL;
2426 }
2427
2428
2429 module_init(bas_gigaset_init);
2430 module_exit(bas_gigaset_exit);
2431
2432 MODULE_AUTHOR(DRIVER_AUTHOR);
2433 MODULE_DESCRIPTION(DRIVER_DESC);
2434 MODULE_LICENSE("GPL");