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