git.oblomov.eu Git - linux-2.6/blob - 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 /* functions called before/after suspend */
  77 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
  78 static int gigaset_resume(struct usb_interface *intf);
  79
  80 /* functions called before/after device reset */
  81 static int gigaset_pre_reset(struct usb_interface *intf);
  82 static int gigaset_post_reset(struct usb_interface *intf);
  83
  84 static int atread_submit(struct cardstate *, int);
  85 static void stopurbs(struct bas_bc_state *);
  86 static int req_submit(struct bc_state *, int, int, int);
  87 static int atwrite_submit(struct cardstate *, unsigned char *, int);
  88 static int start_cbsend(struct cardstate *);
  89
  90 /*============================================================================*/
  91
  92 struct bas_cardstate {
  93         struct usb_device       *udev;          /* USB device pointer */
  94         struct usb_interface    *interface;     /* interface for this device */
  95         unsigned char           minor;          /* starting minor number */
  96
  97         struct urb              *urb_ctrl;      /* control pipe default URB */
  98         struct usb_ctrlrequest  dr_ctrl;
  99         struct timer_list       timer_ctrl;     /* control request timeout */
 100         int                     retry_ctrl;
 101
 102         struct timer_list       timer_atrdy;    /* AT command ready timeout */
 103         struct urb              *urb_cmd_out;   /* for sending AT commands */
 104         struct usb_ctrlrequest  dr_cmd_out;
 105         int                     retry_cmd_out;
 106
 107         struct urb              *urb_cmd_in;    /* for receiving AT replies */
 108         struct usb_ctrlrequest  dr_cmd_in;
 109         struct timer_list       timer_cmd_in;   /* receive request timeout */
 110         unsigned char           *rcvbuf;        /* AT reply receive buffer */
 111
 112         struct urb              *urb_int_in;    /* URB for interrupt pipe */
 113         unsigned char           int_in_buf[3];
 114
 115         spinlock_t              lock;           /* locks all following */
 116         int                     basstate;       /* bitmap (BS_*) */
 117         int                     pending;        /* uncompleted base request */
 118         wait_queue_head_t       waitqueue;
 119         int                     rcvbuf_size;    /* size of AT receive buffer */
 120                                                 /* 0: no receive in progress */
 121         int                     retry_cmd_in;   /* receive req retry count */
 122 };
 123
 124 /* status of direct USB connection to 307x base (bits in basstate) */
 125 #define BS_ATOPEN       0x001   /* AT channel open */
 126 #define BS_B1OPEN       0x002   /* B channel 1 open */
 127 #define BS_B2OPEN       0x004   /* B channel 2 open */
 128 #define BS_ATREADY      0x008   /* base ready for AT command */
 129 #define BS_INIT         0x010   /* base has signalled INIT_OK */
 130 #define BS_ATTIMER      0x020   /* waiting for HD_READY_SEND_ATDATA */
 131 #define BS_ATRDPEND     0x040   /* urb_cmd_in in use */
 132 #define BS_ATWRPEND     0x080   /* urb_cmd_out in use */
 133 #define BS_SUSPEND      0x100   /* USB port suspended */
 134
 135
 136 static struct gigaset_driver *driver = NULL;
 137
 138 /* usb specific object needed to register this driver with the usb subsystem */
 139 static struct usb_driver gigaset_usb_driver = {
 140         .name =         GIGASET_MODULENAME,
 141         .probe =        gigaset_probe,
 142         .disconnect =   gigaset_disconnect,
 143         .id_table =     gigaset_table,
 144         .suspend =      gigaset_suspend,
 145         .resume =       gigaset_resume,
 146         .reset_resume = gigaset_post_reset,
 147         .pre_reset =    gigaset_pre_reset,
 148         .post_reset =   gigaset_post_reset,
 149 };
 150
 151 /* get message text for usb_submit_urb return code
 152  */
 153 static char *get_usb_rcmsg(int rc)
 154 {
 155         static char unkmsg[28];
 156
 157         switch (rc) {
 158         case 0:
 159                 return "success";
 160         case -ENOMEM:
 161                 return "out of memory";
 162         case -ENODEV:
 163                 return "device not present";
 164         case -ENOENT:
 165                 return "endpoint not present";
 166         case -ENXIO:
 167                 return "URB type not supported";
 168         case -EINVAL:
 169                 return "invalid argument";
 170         case -EAGAIN:
 171                 return "start frame too early or too much scheduled";
 172         case -EFBIG:
 173                 return "too many isochronous frames requested";
 174         case -EPIPE:
 175                 return "endpoint stalled";
 176         case -EMSGSIZE:
 177                 return "invalid packet size";
 178         case -ENOSPC:
 179                 return "would overcommit USB bandwidth";
 180         case -ESHUTDOWN:
 181                 return "device shut down";
 182         case -EPERM:
 183                 return "reject flag set";
 184         case -EHOSTUNREACH:
 185                 return "device suspended";
 186         default:
 187                 snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
 188                 return unkmsg;
 189         }
 190 }
 191
 192 /* get message text for USB status code
 193  */
 194 static char *get_usb_statmsg(int status)
 195 {
 196         static char unkmsg[28];
 197
 198         switch (status) {
 199         case 0:
 200                 return "success";
 201         case -ENOENT:
 202                 return "unlinked (sync)";
 203         case -EINPROGRESS:
 204                 return "pending";
 205         case -EPROTO:
 206                 return "bit stuffing error, timeout, or unknown USB error";
 207         case -EILSEQ:
 208                 return "CRC mismatch, timeout, or unknown USB error";
 209         case -ETIME:
 210                 return "timed out";
 211         case -EPIPE:
 212                 return "endpoint stalled";
 213         case -ECOMM:
 214                 return "IN buffer overrun";
 215         case -ENOSR:
 216                 return "OUT buffer underrun";
 217         case -EOVERFLOW:
 218                 return "too much data";
 219         case -EREMOTEIO:
 220                 return "short packet detected";
 221         case -ENODEV:
 222                 return "device removed";
 223         case -EXDEV:
 224                 return "partial isochronous transfer";
 225         case -EINVAL:
 226                 return "invalid argument";
 227         case -ECONNRESET:
 228                 return "unlinked (async)";
 229         case -ESHUTDOWN:
 230                 return "device shut down";
 231         default:
 232                 snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
 233                 return unkmsg;
 234         }
 235 }
 236
 237 /* usb_pipetype_str
 238  * retrieve string representation of USB pipe type
 239  */
 240 static inline char *usb_pipetype_str(int pipe)
 241 {
 242         if (usb_pipeisoc(pipe))
 243                 return "Isoc";
 244         if (usb_pipeint(pipe))
 245                 return "Int";
 246         if (usb_pipecontrol(pipe))
 247                 return "Ctrl";
 248         if (usb_pipebulk(pipe))
 249                 return "Bulk";
 250         return "?";
 251 }
 252
 253 /* dump_urb
 254  * write content of URB to syslog for debugging
 255  */
 256 static inline void dump_urb(enum debuglevel level, const char *tag,
 257                             struct urb *urb)
 258 {
 259 #ifdef CONFIG_GIGASET_DEBUG
 260         int i;
 261         gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
 262         if (urb) {
 263                 gig_dbg(level,
 264                         "  dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
 265                         "hcpriv=0x%08lx, transfer_flags=0x%x,",
 266                         (unsigned long) urb->dev,
 267                         usb_pipetype_str(urb->pipe),
 268                         usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
 269                         usb_pipein(urb->pipe) ? "in" : "out",
 270                         (unsigned long) urb->hcpriv,
 271                         urb->transfer_flags);
 272                 gig_dbg(level,
 273                         "  transfer_buffer=0x%08lx[%d], actual_length=%d, "
 274                         "setup_packet=0x%08lx,",
 275                         (unsigned long) urb->transfer_buffer,
 276                         urb->transfer_buffer_length, urb->actual_length,
 277                         (unsigned long) urb->setup_packet);
 278                 gig_dbg(level,
 279                         "  start_frame=%d, number_of_packets=%d, interval=%d, "
 280                         "error_count=%d,",
 281                         urb->start_frame, urb->number_of_packets, urb->interval,
 282                         urb->error_count);
 283                 gig_dbg(level,
 284                         "  context=0x%08lx, complete=0x%08lx, "
 285                         "iso_frame_desc[]={",
 286                         (unsigned long) urb->context,
 287                         (unsigned long) urb->complete);
 288                 for (i = 0; i < urb->number_of_packets; i++) {
 289                         struct usb_iso_packet_descriptor *pifd
 290                                 = &urb->iso_frame_desc[i];
 291                         gig_dbg(level,
 292                                 "    {offset=%u, length=%u, actual_length=%u, "
 293                                 "status=%u}",
 294                                 pifd->offset, pifd->length, pifd->actual_length,
 295                                 pifd->status);
 296                 }
 297         }
 298         gig_dbg(level, "}}");
 299 #endif
 300 }
 301
 302 /* read/set modem control bits etc. (m10x only) */
 303 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
 304                                   unsigned new_state)
 305 {
 306         return -EINVAL;
 307 }
 308
 309 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
 310 {
 311         return -EINVAL;
 312 }
 313
 314 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
 315 {
 316         return -EINVAL;
 317 }
 318
 319 /* error_hangup
 320  * hang up any existing connection because of an unrecoverable error
 321  * This function may be called from any context and takes care of scheduling
 322  * the necessary actions for execution outside of interrupt context.
 323  * cs->lock must not be held.
 324  * argument:
 325  *      B channel control structure
 326  */
 327 static inline void error_hangup(struct bc_state *bcs)
 328 {
 329         struct cardstate *cs = bcs->cs;
 330
 331         gig_dbg(DEBUG_ANY, "%s: scheduling HUP for channel %d",
 332                 __func__, bcs->channel);
 333
 334         if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL))
 335                 dev_err(cs->dev, "event queue full\n");
 336
 337         gigaset_schedule_event(cs);
 338 }
 339
 340 /* error_reset
 341  * reset Gigaset device because of an unrecoverable error
 342  * This function may be called from any context, and takes care of
 343  * scheduling the necessary actions for execution outside of interrupt context.
 344  * cs->lock must not be held.
 345  * argument:
 346  *      controller state structure
 347  */
 348 static inline void error_reset(struct cardstate *cs)
 349 {
 350         /* close AT command channel to recover (ignore errors) */
 351         req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
 352
 353         //FIXME try to recover without bothering the user
 354         dev_err(cs->dev,
 355             "unrecoverable error - please disconnect Gigaset base to reset\n");
 356 }
 357
 358 /* check_pending
 359  * check for completion of pending control request
 360  * parameter:
 361  *      ucs     hardware specific controller state structure
 362  */
 363 static void check_pending(struct bas_cardstate *ucs)
 364 {
 365         unsigned long flags;
 366
 367         spin_lock_irqsave(&ucs->lock, flags);
 368         switch (ucs->pending) {
 369         case 0:
 370                 break;
 371         case HD_OPEN_ATCHANNEL:
 372                 if (ucs->basstate & BS_ATOPEN)
 373                         ucs->pending = 0;
 374                 break;
 375         case HD_OPEN_B1CHANNEL:
 376                 if (ucs->basstate & BS_B1OPEN)
 377                         ucs->pending = 0;
 378                 break;
 379         case HD_OPEN_B2CHANNEL:
 380                 if (ucs->basstate & BS_B2OPEN)
 381                         ucs->pending = 0;
 382                 break;
 383         case HD_CLOSE_ATCHANNEL:
 384                 if (!(ucs->basstate & BS_ATOPEN))
 385                         ucs->pending = 0;
 386                 break;
 387         case HD_CLOSE_B1CHANNEL:
 388                 if (!(ucs->basstate & BS_B1OPEN))
 389                         ucs->pending = 0;
 390                 break;
 391         case HD_CLOSE_B2CHANNEL:
 392                 if (!(ucs->basstate & BS_B2OPEN))
 393                         ucs->pending = 0;
 394                 break;
 395         case HD_DEVICE_INIT_ACK:                /* no reply expected */
 396                 ucs->pending = 0;
 397                 break;
 398         /* HD_READ_ATMESSAGE, HD_WRITE_ATMESSAGE, HD_RESET_INTERRUPTPIPE
 399          * are handled separately and should never end up here
 400          */
 401         default:
 402                 dev_warn(&ucs->interface->dev,
 403                          "unknown pending request 0x%02x cleared\n",
 404                          ucs->pending);
 405                 ucs->pending = 0;
 406         }
 407
 408         if (!ucs->pending)
 409                 del_timer(&ucs->timer_ctrl);
 410
 411         spin_unlock_irqrestore(&ucs->lock, flags);
 412 }
 413
 414 /* cmd_in_timeout
 415  * timeout routine for command input request
 416  * argument:
 417  *      controller state structure
 418  */
 419 static void cmd_in_timeout(unsigned long data)
 420 {
 421         struct cardstate *cs = (struct cardstate *) data;
 422         struct bas_cardstate *ucs = cs->hw.bas;
 423         int rc;
 424
 425         if (!ucs->rcvbuf_size) {
 426                 gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
 427                 return;
 428         }
 429
 430         if (ucs->retry_cmd_in++ < BAS_RETRY) {
 431                 dev_notice(cs->dev, "control read: timeout, retry %d\n",
 432                            ucs->retry_cmd_in);
 433                 rc = atread_submit(cs, BAS_TIMEOUT);
 434                 if (rc >= 0 || rc == -ENODEV)
 435                         /* resubmitted or disconnected */
 436                         /* - bypass regular exit block */
 437                         return;
 438         } else {
 439                 dev_err(cs->dev,
 440                         "control read: timeout, giving up after %d tries\n",
 441                         ucs->retry_cmd_in);
 442         }
 443         kfree(ucs->rcvbuf);
 444         ucs->rcvbuf = NULL;
 445         ucs->rcvbuf_size = 0;
 446         error_reset(cs);
 447 }
 448
 449 /* set/clear bits in base connection state, return previous state
 450  */
 451 inline static int update_basstate(struct bas_cardstate *ucs,
 452                                   int set, int clear)
 453 {
 454         unsigned long flags;
 455         int state;
 456
 457         spin_lock_irqsave(&ucs->lock, flags);
 458         state = ucs->basstate;
 459         ucs->basstate = (state & ~clear) | set;
 460         spin_unlock_irqrestore(&ucs->lock, flags);
 461         return state;
 462 }
 463
 464 /* read_ctrl_callback
 465  * USB completion handler for control pipe input
 466  * called by the USB subsystem in interrupt context
 467  * parameter:
 468  *      urb     USB request block
 469  *              urb->context = inbuf structure for controller state
 470  */
 471 static void read_ctrl_callback(struct urb *urb)
 472 {
 473         struct inbuf_t *inbuf = urb->context;
 474         struct cardstate *cs = inbuf->cs;
 475         struct bas_cardstate *ucs = cs->hw.bas;
 476         int status = urb->status;
 477         int have_data = 0;
 478         unsigned numbytes;
 479         int rc;
 480
 481         update_basstate(ucs, 0, BS_ATRDPEND);
 482         wake_up(&ucs->waitqueue);
 483
 484         if (!ucs->rcvbuf_size) {
 485                 dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
 486                 return;
 487         }
 488
 489         del_timer(&ucs->timer_cmd_in);
 490
 491         switch (status) {
 492         case 0:                         /* normal completion */
 493                 numbytes = urb->actual_length;
 494                 if (unlikely(numbytes != ucs->rcvbuf_size)) {
 495                         dev_warn(cs->dev,
 496                                "control read: received %d chars, expected %d\n",
 497                                  numbytes, ucs->rcvbuf_size);
 498                         if (numbytes > ucs->rcvbuf_size)
 499                                 numbytes = ucs->rcvbuf_size;
 500                 }
 501
 502                 /* copy received bytes to inbuf */
 503                 have_data = gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes);
 504
 505                 if (unlikely(numbytes < ucs->rcvbuf_size)) {
 506                         /* incomplete - resubmit for remaining bytes */
 507                         ucs->rcvbuf_size -= numbytes;
 508                         ucs->retry_cmd_in = 0;
 509                         rc = atread_submit(cs, BAS_TIMEOUT);
 510                         if (rc >= 0 || rc == -ENODEV)
 511                                 /* resubmitted or disconnected */
 512                                 /* - bypass regular exit block */
 513                                 return;
 514                         error_reset(cs);
 515                 }
 516                 break;
 517
 518         case -ENOENT:                   /* cancelled */
 519         case -ECONNRESET:               /* cancelled (async) */
 520         case -EINPROGRESS:              /* pending */
 521         case -ENODEV:                   /* device removed */
 522         case -ESHUTDOWN:                /* device shut down */
 523                 /* no action necessary */
 524                 gig_dbg(DEBUG_USBREQ, "%s: %s",
 525                         __func__, get_usb_statmsg(status));
 526                 break;
 527
 528         default:                        /* severe trouble */
 529                 dev_warn(cs->dev, "control read: %s\n",
 530                          get_usb_statmsg(status));
 531                 if (ucs->retry_cmd_in++ < BAS_RETRY) {
 532                         dev_notice(cs->dev, "control read: retry %d\n",
 533                                    ucs->retry_cmd_in);
 534                         rc = atread_submit(cs, BAS_TIMEOUT);
 535                         if (rc >= 0 || rc == -ENODEV)
 536                                 /* resubmitted or disconnected */
 537                                 /* - bypass regular exit block */
 538                                 return;
 539                 } else {
 540                         dev_err(cs->dev,
 541                                 "control read: giving up after %d tries\n",
 542                                 ucs->retry_cmd_in);
 543                 }
 544                 error_reset(cs);
 545         }
 546
 547         kfree(ucs->rcvbuf);
 548         ucs->rcvbuf = NULL;
 549         ucs->rcvbuf_size = 0;
 550         if (have_data) {
 551                 gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
 552                 gigaset_schedule_event(cs);
 553         }
 554 }
 555
 556 /* atread_submit
 557  * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
 558  * parameters:
 559  *      cs      controller state structure
 560  *      timeout timeout in 1/10 sec., 0: none
 561  * return value:
 562  *      0 on success
 563  *      -EBUSY if another request is pending
 564  *      any URB submission error code
 565  */
 566 static int atread_submit(struct cardstate *cs, int timeout)
 567 {
 568         struct bas_cardstate *ucs = cs->hw.bas;
 569         int basstate;
 570         int ret;
 571
 572         gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
 573                 ucs->rcvbuf_size);
 574
 575         basstate = update_basstate(ucs, BS_ATRDPEND, 0);
 576         if (basstate & BS_ATRDPEND) {
 577                 dev_err(cs->dev,
 578                         "could not submit HD_READ_ATMESSAGE: URB busy\n");
 579                 return -EBUSY;
 580         }
 581
 582         if (basstate & BS_SUSPEND) {
 583                 dev_notice(cs->dev,
 584                            "HD_READ_ATMESSAGE not submitted, "
 585                            "suspend in progress\n");
 586                 update_basstate(ucs, 0, BS_ATRDPEND);
 587                 /* treat like disconnect */
 588                 return -ENODEV;
 589         }
 590
 591         ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
 592         ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
 593         ucs->dr_cmd_in.wValue = 0;
 594         ucs->dr_cmd_in.wIndex = 0;
 595         ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
 596         usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
 597                              usb_rcvctrlpipe(ucs->udev, 0),
 598                              (unsigned char*) & ucs->dr_cmd_in,
 599                              ucs->rcvbuf, ucs->rcvbuf_size,
 600                              read_ctrl_callback, cs->inbuf);
 601
 602         if ((ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC)) != 0) {
 603                 update_basstate(ucs, 0, BS_ATRDPEND);
 604                 dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
 605                         get_usb_rcmsg(ret));
 606                 return ret;
 607         }
 608
 609         if (timeout > 0) {
 610                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
 611                 ucs->timer_cmd_in.expires = jiffies + timeout * HZ / 10;
 612                 ucs->timer_cmd_in.data = (unsigned long) cs;
 613                 ucs->timer_cmd_in.function = cmd_in_timeout;
 614                 add_timer(&ucs->timer_cmd_in);
 615         }
 616         return 0;
 617 }
 618
 619 /* read_int_callback
 620  * USB completion handler for interrupt pipe input
 621  * called by the USB subsystem in interrupt context
 622  * parameter:
 623  *      urb     USB request block
 624  *              urb->context = controller state structure
 625  */
 626 static void read_int_callback(struct urb *urb)
 627 {
 628         struct cardstate *cs = urb->context;
 629         struct bas_cardstate *ucs = cs->hw.bas;
 630         struct bc_state *bcs;
 631         int status = urb->status;
 632         unsigned long flags;
 633         int rc;
 634         unsigned l;
 635         int channel;
 636
 637         switch (status) {
 638         case 0:                 /* success */
 639                 break;
 640         case -ENOENT:                   /* cancelled */
 641         case -ECONNRESET:               /* cancelled (async) */
 642         case -EINPROGRESS:              /* pending */
 643                 /* ignore silently */
 644                 gig_dbg(DEBUG_USBREQ, "%s: %s",
 645                         __func__, get_usb_statmsg(status));
 646                 return;
 647         case -ENODEV:                   /* device removed */
 648         case -ESHUTDOWN:                /* device shut down */
 649                 //FIXME use this as disconnect indicator?
 650                 gig_dbg(DEBUG_USBREQ, "%s: device disconnected", __func__);
 651                 return;
 652         default:                /* severe trouble */
 653                 dev_warn(cs->dev, "interrupt read: %s\n",
 654                          get_usb_statmsg(status));
 655                 //FIXME corrective action? resubmission always ok?
 656                 goto resubmit;
 657         }
 658
 659         /* drop incomplete packets even if the missing bytes wouldn't matter */
 660         if (unlikely(urb->actual_length < 3)) {
 661                 dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
 662                          urb->actual_length);
 663                 goto resubmit;
 664         }
 665
 666         l = (unsigned) ucs->int_in_buf[1] +
 667             (((unsigned) ucs->int_in_buf[2]) << 8);
 668
 669         gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
 670                 urb->actual_length, (int)ucs->int_in_buf[0], l,
 671                 (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
 672
 673         channel = 0;
 674
 675         switch (ucs->int_in_buf[0]) {
 676         case HD_DEVICE_INIT_OK:
 677                 update_basstate(ucs, BS_INIT, 0);
 678                 break;
 679
 680         case HD_READY_SEND_ATDATA:
 681                 del_timer(&ucs->timer_atrdy);
 682                 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
 683                 start_cbsend(cs);
 684                 break;
 685
 686         case HD_OPEN_B2CHANNEL_ACK:
 687                 ++channel;
 688         case HD_OPEN_B1CHANNEL_ACK:
 689                 bcs = cs->bcs + channel;
 690                 update_basstate(ucs, BS_B1OPEN << channel, 0);
 691                 gigaset_bchannel_up(bcs);
 692                 break;
 693
 694         case HD_OPEN_ATCHANNEL_ACK:
 695                 update_basstate(ucs, BS_ATOPEN, 0);
 696                 start_cbsend(cs);
 697                 break;
 698
 699         case HD_CLOSE_B2CHANNEL_ACK:
 700                 ++channel;
 701         case HD_CLOSE_B1CHANNEL_ACK:
 702                 bcs = cs->bcs + channel;
 703                 update_basstate(ucs, 0, BS_B1OPEN << channel);
 704                 stopurbs(bcs->hw.bas);
 705                 gigaset_bchannel_down(bcs);
 706                 break;
 707
 708         case HD_CLOSE_ATCHANNEL_ACK:
 709                 update_basstate(ucs, 0, BS_ATOPEN);
 710                 break;
 711
 712         case HD_B2_FLOW_CONTROL:
 713                 ++channel;
 714         case HD_B1_FLOW_CONTROL:
 715                 bcs = cs->bcs + channel;
 716                 atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
 717                            &bcs->hw.bas->corrbytes);
 718                 gig_dbg(DEBUG_ISO,
 719                         "Flow control (channel %d, sub %d): 0x%02x => %d",
 720                         channel, bcs->hw.bas->numsub, l,
 721                         atomic_read(&bcs->hw.bas->corrbytes));
 722                 break;
 723
 724         case HD_RECEIVEATDATA_ACK:      /* AT response ready to be received */
 725                 if (!l) {
 726                         dev_warn(cs->dev,
 727                                 "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
 728                         break;
 729                 }
 730                 spin_lock_irqsave(&cs->lock, flags);
 731                 if (ucs->rcvbuf_size) {
 732                         /* throw away previous buffer - we have no queue */
 733                         dev_err(cs->dev,
 734                                 "receive AT data overrun, %d bytes lost\n",
 735                                 ucs->rcvbuf_size);
 736                         kfree(ucs->rcvbuf);
 737                         ucs->rcvbuf_size = 0;
 738                 }
 739                 if ((ucs->rcvbuf = kmalloc(l, GFP_ATOMIC)) == NULL) {
 740                         spin_unlock_irqrestore(&cs->lock, flags);
 741                         dev_err(cs->dev, "out of memory receiving AT data\n");
 742                         error_reset(cs);
 743                         break;
 744                 }
 745                 ucs->rcvbuf_size = l;
 746                 ucs->retry_cmd_in = 0;
 747                 if ((rc = atread_submit(cs, BAS_TIMEOUT)) < 0) {
 748                         kfree(ucs->rcvbuf);
 749                         ucs->rcvbuf = NULL;
 750                         ucs->rcvbuf_size = 0;
 751                         if (rc != -ENODEV) {
 752                                 //FIXME corrective action?
 753                                 spin_unlock_irqrestore(&cs->lock, flags);
 754                                 error_reset(cs);
 755                                 break;
 756                         }
 757                 }
 758                 spin_unlock_irqrestore(&cs->lock, flags);
 759                 break;
 760
 761         case HD_RESET_INTERRUPT_PIPE_ACK:
 762                 gig_dbg(DEBUG_USBREQ, "HD_RESET_INTERRUPT_PIPE_ACK");
 763                 break;
 764
 765         case HD_SUSPEND_END:
 766                 gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
 767                 break;
 768
 769         default:
 770                 dev_warn(cs->dev,
 771                          "unknown Gigaset signal 0x%02x (%u) ignored\n",
 772                          (int) ucs->int_in_buf[0], l);
 773         }
 774
 775         check_pending(ucs);
 776         wake_up(&ucs->waitqueue);
 777
 778 resubmit:
 779         rc = usb_submit_urb(urb, GFP_ATOMIC);
 780         if (unlikely(rc != 0 && rc != -ENODEV)) {
 781                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
 782                         get_usb_rcmsg(rc));
 783                 error_reset(cs);
 784         }
 785 }
 786
 787 /* read_iso_callback
 788  * USB completion handler for B channel isochronous input
 789  * called by the USB subsystem in interrupt context
 790  * parameter:
 791  *      urb     USB request block of completed request
 792  *              urb->context = bc_state structure
 793  */
 794 static void read_iso_callback(struct urb *urb)
 795 {
 796         struct bc_state *bcs;
 797         struct bas_bc_state *ubc;
 798         int status = urb->status;
 799         unsigned long flags;
 800         int i, rc;
 801
 802         /* status codes not worth bothering the tasklet with */
 803         if (unlikely(status == -ENOENT ||
 804                      status == -ECONNRESET ||
 805                      status == -EINPROGRESS ||
 806                      status == -ENODEV ||
 807                      status == -ESHUTDOWN)) {
 808                 gig_dbg(DEBUG_ISO, "%s: %s",
 809                         __func__, get_usb_statmsg(status));
 810                 return;
 811         }
 812
 813         bcs = urb->context;
 814         ubc = bcs->hw.bas;
 815
 816         spin_lock_irqsave(&ubc->isoinlock, flags);
 817         if (likely(ubc->isoindone == NULL)) {
 818                 /* pass URB to tasklet */
 819                 ubc->isoindone = urb;
 820                 ubc->isoinstatus = status;
 821                 tasklet_schedule(&ubc->rcvd_tasklet);
 822         } else {
 823                 /* tasklet still busy, drop data and resubmit URB */
 824                 ubc->loststatus = status;
 825                 for (i = 0; i < BAS_NUMFRAMES; i++) {
 826                         ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
 827                         if (unlikely(urb->iso_frame_desc[i].status != 0 &&
 828                                      urb->iso_frame_desc[i].status !=
 829                                                                 -EINPROGRESS))
 830                                 ubc->loststatus = urb->iso_frame_desc[i].status;
 831                         urb->iso_frame_desc[i].status = 0;
 832                         urb->iso_frame_desc[i].actual_length = 0;
 833                 }
 834                 if (likely(ubc->running)) {
 835                         /* urb->dev is clobbered by USB subsystem */
 836                         urb->dev = bcs->cs->hw.bas->udev;
 837                         urb->transfer_flags = URB_ISO_ASAP;
 838                         urb->number_of_packets = BAS_NUMFRAMES;
 839                         gig_dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit",
 840                                 __func__);
 841                         rc = usb_submit_urb(urb, GFP_ATOMIC);
 842                         if (unlikely(rc != 0 && rc != -ENODEV)) {
 843                                 dev_err(bcs->cs->dev,
 844                                         "could not resubmit isochronous read "
 845                                         "URB: %s\n", get_usb_rcmsg(rc));
 846                                 dump_urb(DEBUG_ISO, "isoc read", urb);
 847                                 error_hangup(bcs);
 848                         }
 849                 }
 850         }
 851         spin_unlock_irqrestore(&ubc->isoinlock, flags);
 852 }
 853
 854 /* write_iso_callback
 855  * USB completion handler for B channel isochronous output
 856  * called by the USB subsystem in interrupt context
 857  * parameter:
 858  *      urb     USB request block of completed request
 859  *              urb->context = isow_urbctx_t structure
 860  */
 861 static void write_iso_callback(struct urb *urb)
 862 {
 863         struct isow_urbctx_t *ucx;
 864         struct bas_bc_state *ubc;
 865         int status = urb->status;
 866         unsigned long flags;
 867
 868         /* status codes not worth bothering the tasklet with */
 869         if (unlikely(status == -ENOENT ||
 870                      status == -ECONNRESET ||
 871                      status == -EINPROGRESS ||
 872                      status == -ENODEV ||
 873                      status == -ESHUTDOWN)) {
 874                 gig_dbg(DEBUG_ISO, "%s: %s",
 875                         __func__, get_usb_statmsg(status));
 876                 return;
 877         }
 878
 879         /* pass URB context to tasklet */
 880         ucx = urb->context;
 881         ubc = ucx->bcs->hw.bas;
 882         ucx->status = status;
 883
 884         spin_lock_irqsave(&ubc->isooutlock, flags);
 885         ubc->isooutovfl = ubc->isooutdone;
 886         ubc->isooutdone = ucx;
 887         spin_unlock_irqrestore(&ubc->isooutlock, flags);
 888         tasklet_schedule(&ubc->sent_tasklet);
 889 }
 890
 891 /* starturbs
 892  * prepare and submit USB request blocks for isochronous input and output
 893  * argument:
 894  *      B channel control structure
 895  * return value:
 896  *      0 on success
 897  *      < 0 on error (no URBs submitted)
 898  */
 899 static int starturbs(struct bc_state *bcs)
 900 {
 901         struct bas_bc_state *ubc = bcs->hw.bas;
 902         struct urb *urb;
 903         int j, k;
 904         int rc;
 905
 906         /* initialize L2 reception */
 907         if (bcs->proto2 == ISDN_PROTO_L2_HDLC)
 908                 bcs->inputstate |= INS_flag_hunt;
 909
 910         /* submit all isochronous input URBs */
 911         ubc->running = 1;
 912         for (k = 0; k < BAS_INURBS; k++) {
 913                 urb = ubc->isoinurbs[k];
 914                 if (!urb) {
 915                         rc = -EFAULT;
 916                         goto error;
 917                 }
 918
 919                 urb->dev = bcs->cs->hw.bas->udev;
 920                 urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
 921                 urb->transfer_flags = URB_ISO_ASAP;
 922                 urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
 923                 urb->transfer_buffer_length = BAS_INBUFSIZE;
 924                 urb->number_of_packets = BAS_NUMFRAMES;
 925                 urb->interval = BAS_FRAMETIME;
 926                 urb->complete = read_iso_callback;
 927                 urb->context = bcs;
 928                 for (j = 0; j < BAS_NUMFRAMES; j++) {
 929                         urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
 930                         urb->iso_frame_desc[j].length = BAS_MAXFRAME;
 931                         urb->iso_frame_desc[j].status = 0;
 932                         urb->iso_frame_desc[j].actual_length = 0;
 933                 }
 934
 935                 dump_urb(DEBUG_ISO, "Initial isoc read", urb);
 936                 if ((rc = usb_submit_urb(urb, GFP_ATOMIC)) != 0)
 937                         goto error;
 938         }
 939
 940         /* initialize L2 transmission */
 941         gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
 942
 943         /* set up isochronous output URBs for flag idling */
 944         for (k = 0; k < BAS_OUTURBS; ++k) {
 945                 urb = ubc->isoouturbs[k].urb;
 946                 if (!urb) {
 947                         rc = -EFAULT;
 948                         goto error;
 949                 }
 950                 urb->dev = bcs->cs->hw.bas->udev;
 951                 urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
 952                 urb->transfer_flags = URB_ISO_ASAP;
 953                 urb->transfer_buffer = ubc->isooutbuf->data;
 954                 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
 955                 urb->number_of_packets = BAS_NUMFRAMES;
 956                 urb->interval = BAS_FRAMETIME;
 957                 urb->complete = write_iso_callback;
 958                 urb->context = &ubc->isoouturbs[k];
 959                 for (j = 0; j < BAS_NUMFRAMES; ++j) {
 960                         urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
 961                         urb->iso_frame_desc[j].length = BAS_NORMFRAME;
 962                         urb->iso_frame_desc[j].status = 0;
 963                         urb->iso_frame_desc[j].actual_length = 0;
 964                 }
 965                 ubc->isoouturbs[k].limit = -1;
 966         }
 967
 968         /* keep one URB free, submit the others */
 969         for (k = 0; k < BAS_OUTURBS-1; ++k) {
 970                 dump_urb(DEBUG_ISO, "Initial isoc write", urb);
 971                 rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
 972                 if (rc != 0)
 973                         goto error;
 974         }
 975         dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
 976         ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS-1];
 977         ubc->isooutdone = ubc->isooutovfl = NULL;
 978         return 0;
 979  error:
 980         stopurbs(ubc);
 981         return rc;
 982 }
 983
 984 /* stopurbs
 985  * cancel the USB request blocks for isochronous input and output
 986  * errors are silently ignored
 987  * argument:
 988  *      B channel control structure
 989  */
 990 static void stopurbs(struct bas_bc_state *ubc)
 991 {
 992         int k, rc;
 993
 994         ubc->running = 0;
 995
 996         for (k = 0; k < BAS_INURBS; ++k) {
 997                 rc = usb_unlink_urb(ubc->isoinurbs[k]);
 998                 gig_dbg(DEBUG_ISO,
 999                         "%s: isoc input URB %d unlinked, result = %s",
1000                         __func__, k, get_usb_rcmsg(rc));
1001         }
1002
1003         for (k = 0; k < BAS_OUTURBS; ++k) {
1004                 rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
1005                 gig_dbg(DEBUG_ISO,
1006                         "%s: isoc output URB %d unlinked, result = %s",
1007                         __func__, k, get_usb_rcmsg(rc));
1008         }
1009 }
1010
1011 /* Isochronous Write - Bottom Half */
1012 /* =============================== */
1013
1014 /* submit_iso_write_urb
1015  * fill and submit the next isochronous write URB
1016  * parameters:
1017  *      ucx     context structure containing URB
1018  * return value:
1019  *      number of frames submitted in URB
1020  *      0 if URB not submitted because no data available (isooutbuf busy)
1021  *      error code < 0 on error
1022  */
1023 static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
1024 {
1025         struct urb *urb = ucx->urb;
1026         struct bas_bc_state *ubc = ucx->bcs->hw.bas;
1027         struct usb_iso_packet_descriptor *ifd;
1028         int corrbytes, nframe, rc;
1029
1030         /* urb->dev is clobbered by USB subsystem */
1031         urb->dev = ucx->bcs->cs->hw.bas->udev;
1032         urb->transfer_flags = URB_ISO_ASAP;
1033         urb->transfer_buffer = ubc->isooutbuf->data;
1034         urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1035
1036         for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
1037                 ifd = &urb->iso_frame_desc[nframe];
1038
1039                 /* compute frame length according to flow control */
1040                 ifd->length = BAS_NORMFRAME;
1041                 if ((corrbytes = atomic_read(&ubc->corrbytes)) != 0) {
1042                         gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
1043                                 __func__, corrbytes);
1044                         if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
1045                                 corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
1046                         else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
1047                                 corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
1048                         ifd->length += corrbytes;
1049                         atomic_add(-corrbytes, &ubc->corrbytes);
1050                 }
1051
1052                 /* retrieve block of data to send */
1053                 ifd->offset = gigaset_isowbuf_getbytes(ubc->isooutbuf,
1054                                                        ifd->length);
1055                 if (ifd->offset < 0) {
1056                         if (ifd->offset == -EBUSY) {
1057                                 gig_dbg(DEBUG_ISO,
1058                                         "%s: buffer busy at frame %d",
1059                                         __func__, nframe);
1060                                 /* tasklet will be restarted from
1061                                    gigaset_send_skb() */
1062                         } else {
1063                                 dev_err(ucx->bcs->cs->dev,
1064                                         "%s: buffer error %d at frame %d\n",
1065                                         __func__, ifd->offset, nframe);
1066                                 return ifd->offset;
1067                         }
1068                         break;
1069                 }
1070                 ucx->limit = ubc->isooutbuf->nextread;
1071                 ifd->status = 0;
1072                 ifd->actual_length = 0;
1073         }
1074         if (unlikely(nframe == 0))
1075                 return 0;       /* no data to send */
1076         urb->number_of_packets = nframe;
1077
1078         rc = usb_submit_urb(urb, GFP_ATOMIC);
1079         if (unlikely(rc)) {
1080                 if (rc == -ENODEV)
1081                         /* device removed - give up silently */
1082                         gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
1083                 else
1084                         dev_err(ucx->bcs->cs->dev,
1085                                 "could not submit isochronous write URB: %s\n",
1086                                 get_usb_rcmsg(rc));
1087                 return rc;
1088         }
1089         ++ubc->numsub;
1090         return nframe;
1091 }
1092
1093 /* write_iso_tasklet
1094  * tasklet scheduled when an isochronous output URB from the Gigaset device
1095  * has completed
1096  * parameter:
1097  *      data    B channel state structure
1098  */
1099 static void write_iso_tasklet(unsigned long data)
1100 {
1101         struct bc_state *bcs = (struct bc_state *) data;
1102         struct bas_bc_state *ubc = bcs->hw.bas;
1103         struct cardstate *cs = bcs->cs;
1104         struct isow_urbctx_t *done, *next, *ovfl;
1105         struct urb *urb;
1106         int status;
1107         struct usb_iso_packet_descriptor *ifd;
1108         int offset;
1109         unsigned long flags;
1110         int i;
1111         struct sk_buff *skb;
1112         int len;
1113         int rc;
1114
1115         /* loop while completed URBs arrive in time */
1116         for (;;) {
1117                 if (unlikely(!(ubc->running))) {
1118                         gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1119                         return;
1120                 }
1121
1122                 /* retrieve completed URBs */
1123                 spin_lock_irqsave(&ubc->isooutlock, flags);
1124                 done = ubc->isooutdone;
1125                 ubc->isooutdone = NULL;
1126                 ovfl = ubc->isooutovfl;
1127                 ubc->isooutovfl = NULL;
1128                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1129                 if (ovfl) {
1130                         dev_err(cs->dev, "isochronous write buffer underrun\n");
1131                         error_hangup(bcs);
1132                         break;
1133                 }
1134                 if (!done)
1135                         break;
1136
1137                 /* submit free URB if available */
1138                 spin_lock_irqsave(&ubc->isooutlock, flags);
1139                 next = ubc->isooutfree;
1140                 ubc->isooutfree = NULL;
1141                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1142                 if (next) {
1143                         rc = submit_iso_write_urb(next);
1144                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1145                                 /* could not submit URB, put it back */
1146                                 spin_lock_irqsave(&ubc->isooutlock, flags);
1147                                 if (ubc->isooutfree == NULL) {
1148                                         ubc->isooutfree = next;
1149                                         next = NULL;
1150                                 }
1151                                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1152                                 if (next) {
1153                                         /* couldn't put it back */
1154                                         dev_err(cs->dev,
1155                                               "losing isochronous write URB\n");
1156                                         error_hangup(bcs);
1157                                 }
1158                         }
1159                 }
1160
1161                 /* process completed URB */
1162                 urb = done->urb;
1163                 status = done->status;
1164                 switch (status) {
1165                 case -EXDEV:                    /* partial completion */
1166                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1167                                 __func__);
1168                         /* fall through - what's the difference anyway? */
1169                 case 0:                         /* normal completion */
1170                         /* inspect individual frames
1171                          * assumptions (for lack of documentation):
1172                          * - actual_length bytes of first frame in error are
1173                          *   successfully sent
1174                          * - all following frames are not sent at all
1175                          */
1176                         offset = done->limit;   /* default (no error) */
1177                         for (i = 0; i < BAS_NUMFRAMES; i++) {
1178                                 ifd = &urb->iso_frame_desc[i];
1179                                 if (ifd->status ||
1180                                     ifd->actual_length != ifd->length) {
1181                                         dev_warn(cs->dev,
1182                                              "isochronous write: frame %d: %s, "
1183                                              "only %d of %d bytes sent\n",
1184                                              i, get_usb_statmsg(ifd->status),
1185                                              ifd->actual_length, ifd->length);
1186                                         offset = (ifd->offset +
1187                                                   ifd->actual_length)
1188                                                  % BAS_OUTBUFSIZE;
1189                                         break;
1190                                 }
1191                         }
1192 #ifdef CONFIG_GIGASET_DEBUG
1193                         /* check assumption on remaining frames */
1194                         for (; i < BAS_NUMFRAMES; i++) {
1195                                 ifd = &urb->iso_frame_desc[i];
1196                                 if (ifd->status != -EINPROGRESS
1197                                     || ifd->actual_length != 0) {
1198                                         dev_warn(cs->dev,
1199                                              "isochronous write: frame %d: %s, "
1200                                              "%d of %d bytes sent\n",
1201                                              i, get_usb_statmsg(ifd->status),
1202                                              ifd->actual_length, ifd->length);
1203                                         offset = (ifd->offset +
1204                                                   ifd->actual_length)
1205                                                  % BAS_OUTBUFSIZE;
1206                                         break;
1207                                 }
1208                         }
1209 #endif
1210                         break;
1211                 case -EPIPE:                    /* stall - probably underrun */
1212                         dev_err(cs->dev, "isochronous write stalled\n");
1213                         error_hangup(bcs);
1214                         break;
1215                 default:                        /* severe trouble */
1216                         dev_warn(cs->dev, "isochronous write: %s\n",
1217                                  get_usb_statmsg(status));
1218                 }
1219
1220                 /* mark the write buffer area covered by this URB as free */
1221                 if (done->limit >= 0)
1222                         ubc->isooutbuf->read = done->limit;
1223
1224                 /* mark URB as free */
1225                 spin_lock_irqsave(&ubc->isooutlock, flags);
1226                 next = ubc->isooutfree;
1227                 ubc->isooutfree = done;
1228                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1229                 if (next) {
1230                         /* only one URB still active - resubmit one */
1231                         rc = submit_iso_write_urb(next);
1232                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1233                                 /* couldn't submit */
1234                                 error_hangup(bcs);
1235                         }
1236                 }
1237         }
1238
1239         /* process queued SKBs */
1240         while ((skb = skb_dequeue(&bcs->squeue))) {
1241                 /* copy to output buffer, doing L2 encapsulation */
1242                 len = skb->len;
1243                 if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
1244                         /* insufficient buffer space, push back onto queue */
1245                         skb_queue_head(&bcs->squeue, skb);
1246                         gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
1247                                 __func__, skb_queue_len(&bcs->squeue));
1248                         break;
1249                 }
1250                 skb_pull(skb, len);
1251                 gigaset_skb_sent(bcs, skb);
1252                 dev_kfree_skb_any(skb);
1253         }
1254 }
1255
1256 /* Isochronous Read - Bottom Half */
1257 /* ============================== */
1258
1259 /* read_iso_tasklet
1260  * tasklet scheduled when an isochronous input URB from the Gigaset device
1261  * has completed
1262  * parameter:
1263  *      data    B channel state structure
1264  */
1265 static void read_iso_tasklet(unsigned long data)
1266 {
1267         struct bc_state *bcs = (struct bc_state *) data;
1268         struct bas_bc_state *ubc = bcs->hw.bas;
1269         struct cardstate *cs = bcs->cs;
1270         struct urb *urb;
1271         int status;
1272         char *rcvbuf;
1273         unsigned long flags;
1274         int totleft, numbytes, offset, frame, rc;
1275
1276         /* loop while more completed URBs arrive in the meantime */
1277         for (;;) {
1278                 /* retrieve URB */
1279                 spin_lock_irqsave(&ubc->isoinlock, flags);
1280                 if (!(urb = ubc->isoindone)) {
1281                         spin_unlock_irqrestore(&ubc->isoinlock, flags);
1282                         return;
1283                 }
1284                 status = ubc->isoinstatus;
1285                 ubc->isoindone = NULL;
1286                 if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1287                         dev_warn(cs->dev,
1288                                  "isochronous read overrun, "
1289                                  "dropped URB with status: %s, %d bytes lost\n",
1290                                  get_usb_statmsg(ubc->loststatus),
1291                                  ubc->isoinlost);
1292                         ubc->loststatus = -EINPROGRESS;
1293                 }
1294                 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1295
1296                 if (unlikely(!(ubc->running))) {
1297                         gig_dbg(DEBUG_ISO,
1298                                 "%s: channel not running, "
1299                                 "dropped URB with status: %s",
1300                                 __func__, get_usb_statmsg(status));
1301                         return;
1302                 }
1303
1304                 switch (status) {
1305                 case 0:                         /* normal completion */
1306                         break;
1307                 case -EXDEV:                    /* inspect individual frames
1308                                                    (we do that anyway) */
1309                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1310                                 __func__);
1311                         break;
1312                 case -ENOENT:
1313                 case -ECONNRESET:
1314                 case -EINPROGRESS:
1315                         gig_dbg(DEBUG_ISO, "%s: %s",
1316                                 __func__, get_usb_statmsg(status));
1317                         continue;               /* -> skip */
1318                 case -EPIPE:
1319                         dev_err(cs->dev, "isochronous read stalled\n");
1320                         error_hangup(bcs);
1321                         continue;               /* -> skip */
1322                 default:                        /* severe trouble */
1323                         dev_warn(cs->dev, "isochronous read: %s\n",
1324                                  get_usb_statmsg(status));
1325                         goto error;
1326                 }
1327
1328                 rcvbuf = urb->transfer_buffer;
1329                 totleft = urb->actual_length;
1330                 for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1331                         if (unlikely(urb->iso_frame_desc[frame].status)) {
1332                                 dev_warn(cs->dev,
1333                                          "isochronous read: frame %d: %s\n",
1334                                          frame,
1335                                          get_usb_statmsg(
1336                                             urb->iso_frame_desc[frame].status));
1337                                 break;
1338                         }
1339                         numbytes = urb->iso_frame_desc[frame].actual_length;
1340                         if (unlikely(numbytes > BAS_MAXFRAME)) {
1341                                 dev_warn(cs->dev,
1342                                          "isochronous read: frame %d: "
1343                                          "numbytes (%d) > BAS_MAXFRAME\n",
1344                                          frame, numbytes);
1345                                 break;
1346                         }
1347                         if (unlikely(numbytes > totleft)) {
1348                                 dev_warn(cs->dev,
1349                                          "isochronous read: frame %d: "
1350                                          "numbytes (%d) > totleft (%d)\n",
1351                                          frame, numbytes, totleft);
1352                                 break;
1353                         }
1354                         offset = urb->iso_frame_desc[frame].offset;
1355                         if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1356                                 dev_warn(cs->dev,
1357                                          "isochronous read: frame %d: "
1358                                          "offset (%d) + numbytes (%d) "
1359                                          "> BAS_INBUFSIZE\n",
1360                                          frame, offset, numbytes);
1361                                 break;
1362                         }
1363                         gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1364                         totleft -= numbytes;
1365                 }
1366                 if (unlikely(totleft > 0))
1367                         dev_warn(cs->dev,
1368                                  "isochronous read: %d data bytes missing\n",
1369                                  totleft);
1370
1371         error:
1372                 /* URB processed, resubmit */
1373                 for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1374                         urb->iso_frame_desc[frame].status = 0;
1375                         urb->iso_frame_desc[frame].actual_length = 0;
1376                 }
1377                 /* urb->dev is clobbered by USB subsystem */
1378                 urb->dev = bcs->cs->hw.bas->udev;
1379                 urb->transfer_flags = URB_ISO_ASAP;
1380                 urb->number_of_packets = BAS_NUMFRAMES;
1381                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1382                 if (unlikely(rc != 0 && rc != -ENODEV)) {
1383                         dev_err(cs->dev,
1384                                 "could not resubmit isochronous read URB: %s\n",
1385                                 get_usb_rcmsg(rc));
1386                         dump_urb(DEBUG_ISO, "resubmit iso read", urb);
1387                         error_hangup(bcs);
1388                 }
1389         }
1390 }
1391
1392 /* Channel Operations */
1393 /* ================== */
1394
1395 /* req_timeout
1396  * timeout routine for control output request
1397  * argument:
1398  *      B channel control structure
1399  */
1400 static void req_timeout(unsigned long data)
1401 {
1402         struct bc_state *bcs = (struct bc_state *) data;
1403         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1404         int pending;
1405         unsigned long flags;
1406
1407         check_pending(ucs);
1408
1409         spin_lock_irqsave(&ucs->lock, flags);
1410         pending = ucs->pending;
1411         ucs->pending = 0;
1412         spin_unlock_irqrestore(&ucs->lock, flags);
1413
1414         switch (pending) {
1415         case 0:                                 /* no pending request */
1416                 gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1417                 break;
1418
1419         case HD_OPEN_ATCHANNEL:
1420                 dev_err(bcs->cs->dev, "timeout opening AT channel\n");
1421                 error_reset(bcs->cs);
1422                 break;
1423
1424         case HD_OPEN_B2CHANNEL:
1425         case HD_OPEN_B1CHANNEL:
1426                 dev_err(bcs->cs->dev, "timeout opening channel %d\n",
1427                         bcs->channel + 1);
1428                 error_hangup(bcs);
1429                 break;
1430
1431         case HD_CLOSE_ATCHANNEL:
1432                 dev_err(bcs->cs->dev, "timeout closing AT channel\n");
1433                 break;
1434
1435         case HD_CLOSE_B2CHANNEL:
1436         case HD_CLOSE_B1CHANNEL:
1437                 dev_err(bcs->cs->dev, "timeout closing channel %d\n",
1438                         bcs->channel + 1);
1439                 error_reset(bcs->cs);
1440                 break;
1441
1442         default:
1443                 dev_warn(bcs->cs->dev, "request 0x%02x timed out, clearing\n",
1444                          pending);
1445         }
1446
1447         wake_up(&ucs->waitqueue);
1448 }
1449
1450 /* write_ctrl_callback
1451  * USB completion handler for control pipe output
1452  * called by the USB subsystem in interrupt context
1453  * parameter:
1454  *      urb     USB request block of completed request
1455  *              urb->context = hardware specific controller state structure
1456  */
1457 static void write_ctrl_callback(struct urb *urb)
1458 {
1459         struct bas_cardstate *ucs = urb->context;
1460         int status = urb->status;
1461         int rc;
1462         unsigned long flags;
1463
1464         /* check status */
1465         switch (status) {
1466         case 0:                                 /* normal completion */
1467                 spin_lock_irqsave(&ucs->lock, flags);
1468                 switch (ucs->pending) {
1469                 case HD_DEVICE_INIT_ACK:        /* no reply expected */
1470                         del_timer(&ucs->timer_ctrl);
1471                         ucs->pending = 0;
1472                         break;
1473                 }
1474                 spin_unlock_irqrestore(&ucs->lock, flags);
1475                 return;
1476
1477         case -ENOENT:                   /* cancelled */
1478         case -ECONNRESET:               /* cancelled (async) */
1479         case -EINPROGRESS:              /* pending */
1480         case -ENODEV:                   /* device removed */
1481         case -ESHUTDOWN:                /* device shut down */
1482                 /* ignore silently */
1483                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1484                         __func__, get_usb_statmsg(status));
1485                 break;
1486
1487         default:                                /* any failure */
1488                 /* don't retry if suspend requested */
1489                 if (++ucs->retry_ctrl > BAS_RETRY ||
1490                     (ucs->basstate & BS_SUSPEND)) {
1491                         dev_err(&ucs->interface->dev,
1492                                 "control request 0x%02x failed: %s\n",
1493                                 ucs->dr_ctrl.bRequest,
1494                                 get_usb_statmsg(status));
1495                         break;          /* give up */
1496                 }
1497                 dev_notice(&ucs->interface->dev,
1498                            "control request 0x%02x: %s, retry %d\n",
1499                            ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
1500                            ucs->retry_ctrl);
1501                 /* urb->dev is clobbered by USB subsystem */
1502                 urb->dev = ucs->udev;
1503                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1504                 if (unlikely(rc)) {
1505                         dev_err(&ucs->interface->dev,
1506                                 "could not resubmit request 0x%02x: %s\n",
1507                                 ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
1508                         break;
1509                 }
1510                 /* resubmitted */
1511                 return;
1512         }
1513
1514         /* failed, clear pending request */
1515         spin_lock_irqsave(&ucs->lock, flags);
1516         del_timer(&ucs->timer_ctrl);
1517         ucs->pending = 0;
1518         spin_unlock_irqrestore(&ucs->lock, flags);
1519         wake_up(&ucs->waitqueue);
1520 }
1521
1522 /* req_submit
1523  * submit a control output request without message buffer to the Gigaset base
1524  * and optionally start a timeout
1525  * parameters:
1526  *      bcs     B channel control structure
1527  *      req     control request code (HD_*)
1528  *      val     control request parameter value (set to 0 if unused)
1529  *      timeout timeout in seconds (0: no timeout)
1530  * return value:
1531  *      0 on success
1532  *      -EBUSY if another request is pending
1533  *      any URB submission error code
1534  */
1535 static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1536 {
1537         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1538         int ret;
1539         unsigned long flags;
1540
1541         gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1542
1543         spin_lock_irqsave(&ucs->lock, flags);
1544         if (ucs->pending) {
1545                 spin_unlock_irqrestore(&ucs->lock, flags);
1546                 dev_err(bcs->cs->dev,
1547                         "submission of request 0x%02x failed: "
1548                         "request 0x%02x still pending\n",
1549                         req, ucs->pending);
1550                 return -EBUSY;
1551         }
1552
1553         ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1554         ucs->dr_ctrl.bRequest = req;
1555         ucs->dr_ctrl.wValue = cpu_to_le16(val);
1556         ucs->dr_ctrl.wIndex = 0;
1557         ucs->dr_ctrl.wLength = 0;
1558         usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1559                              usb_sndctrlpipe(ucs->udev, 0),
1560                              (unsigned char*) &ucs->dr_ctrl, NULL, 0,
1561                              write_ctrl_callback, ucs);
1562         ucs->retry_ctrl = 0;
1563         ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
1564         if (unlikely(ret)) {
1565                 dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1566                         req, get_usb_rcmsg(ret));
1567                 spin_unlock_irqrestore(&ucs->lock, flags);
1568                 return ret;
1569         }
1570         ucs->pending = req;
1571
1572         if (timeout > 0) {
1573                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1574                 ucs->timer_ctrl.expires = jiffies + timeout * HZ / 10;
1575                 ucs->timer_ctrl.data = (unsigned long) bcs;
1576                 ucs->timer_ctrl.function = req_timeout;
1577                 add_timer(&ucs->timer_ctrl);
1578         }
1579
1580         spin_unlock_irqrestore(&ucs->lock, flags);
1581         return 0;
1582 }
1583
1584 /* gigaset_init_bchannel
1585  * called by common.c to connect a B channel
1586  * initialize isochronous I/O and tell the Gigaset base to open the channel
1587  * argument:
1588  *      B channel control structure
1589  * return value:
1590  *      0 on success, error code < 0 on error
1591  */
1592 static int gigaset_init_bchannel(struct bc_state *bcs)
1593 {
1594         struct cardstate *cs = bcs->cs;
1595         int req, ret;
1596         unsigned long flags;
1597
1598         spin_lock_irqsave(&cs->lock, flags);
1599         if (unlikely(!cs->connected)) {
1600                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1601                 spin_unlock_irqrestore(&cs->lock, flags);
1602                 return -ENODEV;
1603         }
1604
1605         if (cs->hw.bas->basstate & BS_SUSPEND) {
1606                 dev_notice(cs->dev,
1607                            "not starting isochronous I/O, "
1608                            "suspend in progress\n");
1609                 spin_unlock_irqrestore(&cs->lock, flags);
1610                 return -EHOSTUNREACH;
1611         }
1612
1613         if ((ret = starturbs(bcs)) < 0) {
1614                 dev_err(cs->dev,
1615                         "could not start isochronous I/O for channel B%d: %s\n",
1616                         bcs->channel + 1,
1617                         ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
1618                 if (ret != -ENODEV)
1619                         error_hangup(bcs);
1620                 spin_unlock_irqrestore(&cs->lock, flags);
1621                 return ret;
1622         }
1623
1624         req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1625         if ((ret = req_submit(bcs, req, 0, BAS_TIMEOUT)) < 0) {
1626                 dev_err(cs->dev, "could not open channel B%d\n",
1627                         bcs->channel + 1);
1628                 stopurbs(bcs->hw.bas);
1629                 if (ret != -ENODEV)
1630                         error_hangup(bcs);
1631         }
1632
1633         spin_unlock_irqrestore(&cs->lock, flags);
1634         return ret;
1635 }
1636
1637 /* gigaset_close_bchannel
1638  * called by common.c to disconnect a B channel
1639  * tell the Gigaset base to close the channel
1640  * stopping isochronous I/O and LL notification will be done when the
1641  * acknowledgement for the close arrives
1642  * argument:
1643  *      B channel control structure
1644  * return value:
1645  *      0 on success, error code < 0 on error
1646  */
1647 static int gigaset_close_bchannel(struct bc_state *bcs)
1648 {
1649         struct cardstate *cs = bcs->cs;
1650         int req, ret;
1651         unsigned long flags;
1652
1653         spin_lock_irqsave(&cs->lock, flags);
1654         if (unlikely(!cs->connected)) {
1655                 spin_unlock_irqrestore(&cs->lock, flags);
1656                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1657                 return -ENODEV;
1658         }
1659
1660         if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1661                 /* channel not running: just signal common.c */
1662                 spin_unlock_irqrestore(&cs->lock, flags);
1663                 gigaset_bchannel_down(bcs);
1664                 return 0;
1665         }
1666
1667         /* channel running: tell device to close it */
1668         req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1669         if ((ret = req_submit(bcs, req, 0, BAS_TIMEOUT)) < 0)
1670                 dev_err(cs->dev, "closing channel B%d failed\n",
1671                         bcs->channel + 1);
1672
1673         spin_unlock_irqrestore(&cs->lock, flags);
1674         return ret;
1675 }
1676
1677 /* Device Operations */
1678 /* ================= */
1679
1680 /* complete_cb
1681  * unqueue first command buffer from queue, waking any sleepers
1682  * must be called with cs->cmdlock held
1683  * parameter:
1684  *      cs      controller state structure
1685  */
1686 static void complete_cb(struct cardstate *cs)
1687 {
1688         struct cmdbuf_t *cb = cs->cmdbuf;
1689
1690         /* unqueue completed buffer */
1691         cs->cmdbytes -= cs->curlen;
1692         gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD,
1693                 "write_command: sent %u bytes, %u left",
1694                 cs->curlen, cs->cmdbytes);
1695         if ((cs->cmdbuf = cb->next) != NULL) {
1696                 cs->cmdbuf->prev = NULL;
1697                 cs->curlen = cs->cmdbuf->len;
1698         } else {
1699                 cs->lastcmdbuf = NULL;
1700                 cs->curlen = 0;
1701         }
1702
1703         if (cb->wake_tasklet)
1704                 tasklet_schedule(cb->wake_tasklet);
1705
1706         kfree(cb);
1707 }
1708
1709 /* write_command_callback
1710  * USB completion handler for AT command transmission
1711  * called by the USB subsystem in interrupt context
1712  * parameter:
1713  *      urb     USB request block of completed request
1714  *              urb->context = controller state structure
1715  */
1716 static void write_command_callback(struct urb *urb)
1717 {
1718         struct cardstate *cs = urb->context;
1719         struct bas_cardstate *ucs = cs->hw.bas;
1720         int status = urb->status;
1721         unsigned long flags;
1722
1723         update_basstate(ucs, 0, BS_ATWRPEND);
1724         wake_up(&ucs->waitqueue);
1725
1726         /* check status */
1727         switch (status) {
1728         case 0:                                 /* normal completion */
1729                 break;
1730         case -ENOENT:                   /* cancelled */
1731         case -ECONNRESET:               /* cancelled (async) */
1732         case -EINPROGRESS:              /* pending */
1733         case -ENODEV:                   /* device removed */
1734         case -ESHUTDOWN:                /* device shut down */
1735                 /* ignore silently */
1736                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1737                         __func__, get_usb_statmsg(status));
1738                 return;
1739         default:                                /* any failure */
1740                 if (++ucs->retry_cmd_out > BAS_RETRY) {
1741                         dev_warn(cs->dev,
1742                                  "command write: %s, "
1743                                  "giving up after %d retries\n",
1744                                  get_usb_statmsg(status),
1745                                  ucs->retry_cmd_out);
1746                         break;
1747                 }
1748                 if (ucs->basstate & BS_SUSPEND) {
1749                         dev_warn(cs->dev,
1750                                  "command write: %s, "
1751                                  "won't retry - suspend requested\n",
1752                                  get_usb_statmsg(status));
1753                         break;
1754                 }
1755                 if (cs->cmdbuf == NULL) {
1756                         dev_warn(cs->dev,
1757                                  "command write: %s, "
1758                                  "cannot retry - cmdbuf gone\n",
1759                                  get_usb_statmsg(status));
1760                         break;
1761                 }
1762                 dev_notice(cs->dev, "command write: %s, retry %d\n",
1763                            get_usb_statmsg(status), ucs->retry_cmd_out);
1764                 if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1765                         /* resubmitted - bypass regular exit block */
1766                         return;
1767                 /* command send failed, assume base still waiting */
1768                 update_basstate(ucs, BS_ATREADY, 0);
1769         }
1770
1771         spin_lock_irqsave(&cs->cmdlock, flags);
1772         if (cs->cmdbuf != NULL)
1773                 complete_cb(cs);
1774         spin_unlock_irqrestore(&cs->cmdlock, flags);
1775 }
1776
1777 /* atrdy_timeout
1778  * timeout routine for AT command transmission
1779  * argument:
1780  *      controller state structure
1781  */
1782 static void atrdy_timeout(unsigned long data)
1783 {
1784         struct cardstate *cs = (struct cardstate *) data;
1785         struct bas_cardstate *ucs = cs->hw.bas;
1786
1787         dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1788
1789         /* fake the missing signal - what else can I do? */
1790         update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1791         start_cbsend(cs);
1792 }
1793
1794 /* atwrite_submit
1795  * submit an HD_WRITE_ATMESSAGE command URB
1796  * parameters:
1797  *      cs      controller state structure
1798  *      buf     buffer containing command to send
1799  *      len     length of command to send
1800  * return value:
1801  *      0 on success
1802  *      -EBUSY if another request is pending
1803  *      any URB submission error code
1804  */
1805 static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1806 {
1807         struct bas_cardstate *ucs = cs->hw.bas;
1808         int rc;
1809
1810         gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1811
1812         if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1813                 dev_err(cs->dev,
1814                         "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1815                 return -EBUSY;
1816         }
1817
1818         ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1819         ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1820         ucs->dr_cmd_out.wValue = 0;
1821         ucs->dr_cmd_out.wIndex = 0;
1822         ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1823         usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1824                              usb_sndctrlpipe(ucs->udev, 0),
1825                              (unsigned char*) &ucs->dr_cmd_out, buf, len,
1826                              write_command_callback, cs);
1827         rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
1828         if (unlikely(rc)) {
1829                 update_basstate(ucs, 0, BS_ATWRPEND);
1830                 dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1831                         get_usb_rcmsg(rc));
1832                 return rc;
1833         }
1834
1835         /* submitted successfully, start timeout if necessary */
1836         if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1837                 gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
1838                         ATRDY_TIMEOUT);
1839                 ucs->timer_atrdy.expires = jiffies + ATRDY_TIMEOUT * HZ / 10;
1840                 ucs->timer_atrdy.data = (unsigned long) cs;
1841                 ucs->timer_atrdy.function = atrdy_timeout;
1842                 add_timer(&ucs->timer_atrdy);
1843         }
1844         return 0;
1845 }
1846
1847 /* start_cbsend
1848  * start transmission of AT command queue if necessary
1849  * parameter:
1850  *      cs              controller state structure
1851  * return value:
1852  *      0 on success
1853  *      error code < 0 on error
1854  */
1855 static int start_cbsend(struct cardstate *cs)
1856 {
1857         struct cmdbuf_t *cb;
1858         struct bas_cardstate *ucs = cs->hw.bas;
1859         unsigned long flags;
1860         int rc;
1861         int retval = 0;
1862
1863         /* check if suspend requested */
1864         if (ucs->basstate & BS_SUSPEND) {
1865                 gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "suspending");
1866                 return -EHOSTUNREACH;
1867         }
1868
1869         /* check if AT channel is open */
1870         if (!(ucs->basstate & BS_ATOPEN)) {
1871                 gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "AT channel not open");
1872                 rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1873                 if (rc < 0) {
1874                         /* flush command queue */
1875                         spin_lock_irqsave(&cs->cmdlock, flags);
1876                         while (cs->cmdbuf != NULL)
1877                                 complete_cb(cs);
1878                         spin_unlock_irqrestore(&cs->cmdlock, flags);
1879                 }
1880                 return rc;
1881         }
1882
1883         /* try to send first command in queue */
1884         spin_lock_irqsave(&cs->cmdlock, flags);
1885
1886         while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
1887                 ucs->retry_cmd_out = 0;
1888                 rc = atwrite_submit(cs, cb->buf, cb->len);
1889                 if (unlikely(rc)) {
1890                         retval = rc;
1891                         complete_cb(cs);
1892                 }
1893         }
1894
1895         spin_unlock_irqrestore(&cs->cmdlock, flags);
1896         return retval;
1897 }
1898
1899 /* gigaset_write_cmd
1900  * This function is called by the device independent part of the driver
1901  * to transmit an AT command string to the Gigaset device.
1902  * It encapsulates the device specific method for transmission over the
1903  * direct USB connection to the base.
1904  * The command string is added to the queue of commands to send, and
1905  * USB transmission is started if necessary.
1906  * parameters:
1907  *      cs              controller state structure
1908  *      buf             command string to send
1909  *      len             number of bytes to send (max. IF_WRITEBUF)
1910  *      wake_tasklet    tasklet to run when transmission is completed
1911  *                      (NULL if none)
1912  * return value:
1913  *      number of bytes queued on success
1914  *      error code < 0 on error
1915  */
1916 static int gigaset_write_cmd(struct cardstate *cs,
1917                              const unsigned char *buf, int len,
1918                              struct tasklet_struct *wake_tasklet)
1919 {
1920         struct cmdbuf_t *cb;
1921         unsigned long flags;
1922         int rc;
1923
1924         gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
1925                              DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1926                            "CMD Transmit", len, buf);
1927
1928         if (len <= 0) {
1929                 /* nothing to do */
1930                 rc = 0;
1931                 goto notqueued;
1932         }
1933
1934         if (len > IF_WRITEBUF)
1935                 len = IF_WRITEBUF;
1936         if (!(cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC))) {
1937                 dev_err(cs->dev, "%s: out of memory\n", __func__);
1938                 rc = -ENOMEM;
1939                 goto notqueued;
1940         }
1941
1942         memcpy(cb->buf, buf, len);
1943         cb->len = len;
1944         cb->offset = 0;
1945         cb->next = NULL;
1946         cb->wake_tasklet = wake_tasklet;
1947
1948         spin_lock_irqsave(&cs->cmdlock, flags);
1949         cb->prev = cs->lastcmdbuf;
1950         if (cs->lastcmdbuf)
1951                 cs->lastcmdbuf->next = cb;
1952         else {
1953                 cs->cmdbuf = cb;
1954                 cs->curlen = len;
1955         }
1956         cs->cmdbytes += len;
1957         cs->lastcmdbuf = cb;
1958         spin_unlock_irqrestore(&cs->cmdlock, flags);
1959
1960         spin_lock_irqsave(&cs->lock, flags);
1961         if (unlikely(!cs->connected)) {
1962                 spin_unlock_irqrestore(&cs->lock, flags);
1963                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1964                 /* flush command queue */
1965                 spin_lock_irqsave(&cs->cmdlock, flags);
1966                 while (cs->cmdbuf != NULL)
1967                         complete_cb(cs);
1968                 spin_unlock_irqrestore(&cs->cmdlock, flags);
1969                 return -ENODEV;
1970         }
1971         rc = start_cbsend(cs);
1972         spin_unlock_irqrestore(&cs->lock, flags);
1973         return rc < 0 ? rc : len;
1974
1975 notqueued:                      /* request handled without queuing */
1976         if (wake_tasklet)
1977                 tasklet_schedule(wake_tasklet);
1978         return rc;
1979 }
1980
1981 /* gigaset_write_room
1982  * tty_driver.write_room interface routine
1983  * return number of characters the driver will accept to be written via
1984  * gigaset_write_cmd
1985  * parameter:
1986  *      controller state structure
1987  * return value:
1988  *      number of characters
1989  */
1990 static int gigaset_write_room(struct cardstate *cs)
1991 {
1992         return IF_WRITEBUF;
1993 }
1994
1995 /* gigaset_chars_in_buffer
1996  * tty_driver.chars_in_buffer interface routine
1997  * return number of characters waiting to be sent
1998  * parameter:
1999  *      controller state structure
2000  * return value:
2001  *      number of characters
2002  */
2003 static int gigaset_chars_in_buffer(struct cardstate *cs)
2004 {
2005         return cs->cmdbytes;
2006 }
2007
2008 /* gigaset_brkchars
2009  * implementation of ioctl(GIGASET_BRKCHARS)
2010  * parameter:
2011  *      controller state structure
2012  * return value:
2013  *      -EINVAL (unimplemented function)
2014  */
2015 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
2016 {
2017         return -EINVAL;
2018 }
2019
2020
2021 /* Device Initialization/Shutdown */
2022 /* ============================== */
2023
2024 /* Free hardware dependent part of the B channel structure
2025  * parameter:
2026  *      bcs     B channel structure
2027  * return value:
2028  *      !=0 on success
2029  */
2030 static int gigaset_freebcshw(struct bc_state *bcs)
2031 {
2032         struct bas_bc_state *ubc = bcs->hw.bas;
2033         int i;
2034
2035         if (!ubc)
2036                 return 0;
2037
2038         /* kill URBs and tasklets before freeing - better safe than sorry */
2039         ubc->running = 0;
2040         gig_dbg(DEBUG_INIT, "%s: killing iso URBs", __func__);
2041         for (i = 0; i < BAS_OUTURBS; ++i) {
2042                 usb_kill_urb(ubc->isoouturbs[i].urb);
2043                 usb_free_urb(ubc->isoouturbs[i].urb);
2044         }
2045         for (i = 0; i < BAS_INURBS; ++i) {
2046                 usb_kill_urb(ubc->isoinurbs[i]);
2047                 usb_free_urb(ubc->isoinurbs[i]);
2048         }
2049         tasklet_kill(&ubc->sent_tasklet);
2050         tasklet_kill(&ubc->rcvd_tasklet);
2051         kfree(ubc->isooutbuf);
2052         kfree(ubc);
2053         bcs->hw.bas = NULL;
2054         return 1;
2055 }
2056
2057 /* Initialize hardware dependent part of the B channel structure
2058  * parameter:
2059  *      bcs     B channel structure
2060  * return value:
2061  *      !=0 on success
2062  */
2063 static int gigaset_initbcshw(struct bc_state *bcs)
2064 {
2065         int i;
2066         struct bas_bc_state *ubc;
2067
2068         bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
2069         if (!ubc) {
2070                 err("could not allocate bas_bc_state");
2071                 return 0;
2072         }
2073
2074         ubc->running = 0;
2075         atomic_set(&ubc->corrbytes, 0);
2076         spin_lock_init(&ubc->isooutlock);
2077         for (i = 0; i < BAS_OUTURBS; ++i) {
2078                 ubc->isoouturbs[i].urb = NULL;
2079                 ubc->isoouturbs[i].bcs = bcs;
2080         }
2081         ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
2082         ubc->numsub = 0;
2083         if (!(ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL))) {
2084                 err("could not allocate isochronous output buffer");
2085                 kfree(ubc);
2086                 bcs->hw.bas = NULL;
2087                 return 0;
2088         }
2089         tasklet_init(&ubc->sent_tasklet,
2090                      &write_iso_tasklet, (unsigned long) bcs);
2091
2092         spin_lock_init(&ubc->isoinlock);
2093         for (i = 0; i < BAS_INURBS; ++i)
2094                 ubc->isoinurbs[i] = NULL;
2095         ubc->isoindone = NULL;
2096         ubc->loststatus = -EINPROGRESS;
2097         ubc->isoinlost = 0;
2098         ubc->seqlen = 0;
2099         ubc->inbyte = 0;
2100         ubc->inbits = 0;
2101         ubc->goodbytes = 0;
2102         ubc->alignerrs = 0;
2103         ubc->fcserrs = 0;
2104         ubc->frameerrs = 0;
2105         ubc->giants = 0;
2106         ubc->runts = 0;
2107         ubc->aborts = 0;
2108         ubc->shared0s = 0;
2109         ubc->stolen0s = 0;
2110         tasklet_init(&ubc->rcvd_tasklet,
2111                      &read_iso_tasklet, (unsigned long) bcs);
2112         return 1;
2113 }
2114
2115 static void gigaset_reinitbcshw(struct bc_state *bcs)
2116 {
2117         struct bas_bc_state *ubc = bcs->hw.bas;
2118
2119         bcs->hw.bas->running = 0;
2120         atomic_set(&bcs->hw.bas->corrbytes, 0);
2121         bcs->hw.bas->numsub = 0;
2122         spin_lock_init(&ubc->isooutlock);
2123         spin_lock_init(&ubc->isoinlock);
2124         ubc->loststatus = -EINPROGRESS;
2125 }
2126
2127 static void gigaset_freecshw(struct cardstate *cs)
2128 {
2129         /* timers, URBs and rcvbuf are disposed of in disconnect */
2130         kfree(cs->hw.bas);
2131         cs->hw.bas = NULL;
2132 }
2133
2134 static int gigaset_initcshw(struct cardstate *cs)
2135 {
2136         struct bas_cardstate *ucs;
2137
2138         cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
2139         if (!ucs)
2140                 return 0;
2141
2142         ucs->urb_cmd_in = NULL;
2143         ucs->urb_cmd_out = NULL;
2144         ucs->rcvbuf = NULL;
2145         ucs->rcvbuf_size = 0;
2146
2147         spin_lock_init(&ucs->lock);
2148         ucs->pending = 0;
2149
2150         ucs->basstate = 0;
2151         init_timer(&ucs->timer_ctrl);
2152         init_timer(&ucs->timer_atrdy);
2153         init_timer(&ucs->timer_cmd_in);
2154         init_waitqueue_head(&ucs->waitqueue);
2155
2156         return 1;
2157 }
2158
2159 /* freeurbs
2160  * unlink and deallocate all URBs unconditionally
2161  * caller must make sure that no commands are still in progress
2162  * parameter:
2163  *      cs      controller state structure
2164  */
2165 static void freeurbs(struct cardstate *cs)
2166 {
2167         struct bas_cardstate *ucs = cs->hw.bas;
2168         struct bas_bc_state *ubc;
2169         int i, j;
2170
2171         gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
2172         for (j = 0; j < BAS_CHANNELS; ++j) {
2173                 ubc = cs->bcs[j].hw.bas;
2174                 for (i = 0; i < BAS_OUTURBS; ++i) {
2175                         usb_kill_urb(ubc->isoouturbs[i].urb);
2176                         usb_free_urb(ubc->isoouturbs[i].urb);
2177                         ubc->isoouturbs[i].urb = NULL;
2178                 }
2179                 for (i = 0; i < BAS_INURBS; ++i) {
2180                         usb_kill_urb(ubc->isoinurbs[i]);
2181                         usb_free_urb(ubc->isoinurbs[i]);
2182                         ubc->isoinurbs[i] = NULL;
2183                 }
2184         }
2185         usb_kill_urb(ucs->urb_int_in);
2186         usb_free_urb(ucs->urb_int_in);
2187         ucs->urb_int_in = NULL;
2188         usb_kill_urb(ucs->urb_cmd_out);
2189         usb_free_urb(ucs->urb_cmd_out);
2190         ucs->urb_cmd_out = NULL;
2191         usb_kill_urb(ucs->urb_cmd_in);
2192         usb_free_urb(ucs->urb_cmd_in);
2193         ucs->urb_cmd_in = NULL;
2194         usb_kill_urb(ucs->urb_ctrl);
2195         usb_free_urb(ucs->urb_ctrl);
2196         ucs->urb_ctrl = NULL;
2197 }
2198
2199 /* gigaset_probe
2200  * This function is called when a new USB device is connected.
2201  * It checks whether the new device is handled by this driver.
2202  */
2203 static int gigaset_probe(struct usb_interface *interface,
2204                          const struct usb_device_id *id)
2205 {
2206         struct usb_host_interface *hostif;
2207         struct usb_device *udev = interface_to_usbdev(interface);
2208         struct cardstate *cs = NULL;
2209         struct bas_cardstate *ucs = NULL;
2210         struct bas_bc_state *ubc;
2211         struct usb_endpoint_descriptor *endpoint;
2212         int i, j;
2213         int rc;
2214
2215         gig_dbg(DEBUG_ANY,
2216                 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2217                 __func__, le16_to_cpu(udev->descriptor.idVendor),
2218                 le16_to_cpu(udev->descriptor.idProduct));
2219
2220         /* set required alternate setting */
2221         hostif = interface->cur_altsetting;
2222         if (hostif->desc.bAlternateSetting != 3) {
2223                 gig_dbg(DEBUG_ANY,
2224                         "%s: wrong alternate setting %d - trying to switch",
2225                         __func__, hostif->desc.bAlternateSetting);
2226                 if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3) < 0) {
2227                         dev_warn(&udev->dev, "usb_set_interface failed, "
2228                                  "device %d interface %d altsetting %d\n",
2229                                  udev->devnum, hostif->desc.bInterfaceNumber,
2230                                  hostif->desc.bAlternateSetting);
2231                         return -ENODEV;
2232                 }
2233                 hostif = interface->cur_altsetting;
2234         }
2235
2236         /* Reject application specific interfaces
2237          */
2238         if (hostif->desc.bInterfaceClass != 255) {
2239                 dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
2240                          __func__, hostif->desc.bInterfaceClass);
2241                 return -ENODEV;
2242         }
2243
2244         dev_info(&udev->dev,
2245                  "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
2246                  __func__, le16_to_cpu(udev->descriptor.idVendor),
2247                  le16_to_cpu(udev->descriptor.idProduct));
2248
2249         /* allocate memory for our device state and intialize it */
2250         cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
2251                             GIGASET_MODULENAME);
2252         if (!cs)
2253                 return -ENODEV;
2254         ucs = cs->hw.bas;
2255
2256         /* save off device structure ptrs for later use */
2257         usb_get_dev(udev);
2258         ucs->udev = udev;
2259         ucs->interface = interface;
2260         cs->dev = &interface->dev;
2261
2262         /* allocate URBs:
2263          * - one for the interrupt pipe
2264          * - three for the different uses of the default control pipe
2265          * - three for each isochronous pipe
2266          */
2267         if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2268             !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2269             !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
2270             !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
2271                 goto allocerr;
2272
2273         for (j = 0; j < BAS_CHANNELS; ++j) {
2274                 ubc = cs->bcs[j].hw.bas;
2275                 for (i = 0; i < BAS_OUTURBS; ++i)
2276                         if (!(ubc->isoouturbs[i].urb =
2277                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2278                                 goto allocerr;
2279                 for (i = 0; i < BAS_INURBS; ++i)
2280                         if (!(ubc->isoinurbs[i] =
2281                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2282                                 goto allocerr;
2283         }
2284
2285         ucs->rcvbuf = NULL;
2286         ucs->rcvbuf_size = 0;
2287
2288         /* Fill the interrupt urb and send it to the core */
2289         endpoint = &hostif->endpoint[0].desc;
2290         usb_fill_int_urb(ucs->urb_int_in, udev,
2291                          usb_rcvintpipe(udev,
2292                                         (endpoint->bEndpointAddress) & 0x0f),
2293                          ucs->int_in_buf, 3, read_int_callback, cs,
2294                          endpoint->bInterval);
2295         if ((rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL)) != 0) {
2296                 dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2297                         get_usb_rcmsg(rc));
2298                 goto error;
2299         }
2300
2301         /* tell the device that the driver is ready */
2302         if ((rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0)) != 0)
2303                 goto error;
2304
2305         /* tell common part that the device is ready */
2306         if (startmode == SM_LOCKED)
2307                 cs->mstate = MS_LOCKED;
2308
2309         /* save address of controller structure */
2310         usb_set_intfdata(interface, cs);
2311
2312         if (!gigaset_start(cs))
2313                 goto error;
2314
2315         return 0;
2316
2317 allocerr:
2318         dev_err(cs->dev, "could not allocate URBs\n");
2319 error:
2320         freeurbs(cs);
2321         usb_set_intfdata(interface, NULL);
2322         gigaset_freecs(cs);
2323         return -ENODEV;
2324 }
2325
2326 /* gigaset_disconnect
2327  * This function is called when the Gigaset base is unplugged.
2328  */
2329 static void gigaset_disconnect(struct usb_interface *interface)
2330 {
2331         struct cardstate *cs;
2332         struct bas_cardstate *ucs;
2333         int j;
2334
2335         cs = usb_get_intfdata(interface);
2336
2337         ucs = cs->hw.bas;
2338
2339         dev_info(cs->dev, "disconnecting Gigaset base\n");
2340
2341         /* mark base as not ready, all channels disconnected */
2342         ucs->basstate = 0;
2343
2344         /* tell LL all channels are down */
2345         for (j = 0; j < BAS_CHANNELS; ++j)
2346                 gigaset_bchannel_down(cs->bcs + j);
2347
2348         /* stop driver (common part) */
2349         gigaset_stop(cs);
2350
2351         /* stop timers and URBs, free ressources */
2352         del_timer_sync(&ucs->timer_ctrl);
2353         del_timer_sync(&ucs->timer_atrdy);
2354         del_timer_sync(&ucs->timer_cmd_in);
2355         freeurbs(cs);
2356         usb_set_intfdata(interface, NULL);
2357         kfree(ucs->rcvbuf);
2358         ucs->rcvbuf = NULL;
2359         ucs->rcvbuf_size = 0;
2360         usb_put_dev(ucs->udev);
2361         ucs->interface = NULL;
2362         ucs->udev = NULL;
2363         cs->dev = NULL;
2364         gigaset_freecs(cs);
2365 }
2366
2367 /* gigaset_suspend
2368  * This function is called before the USB connection is suspended.
2369  */
2370 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
2371 {
2372         struct cardstate *cs = usb_get_intfdata(intf);
2373         struct bas_cardstate *ucs = cs->hw.bas;
2374         int rc;
2375
2376         /* set suspend flag; this stops AT command/response traffic */
2377         if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
2378                 gig_dbg(DEBUG_SUSPEND, "already suspended");
2379                 return 0;
2380         }
2381
2382         /* wait a bit for blocking conditions to go away */
2383         rc = wait_event_timeout(ucs->waitqueue,
2384                         !(ucs->basstate &
2385                           (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)),
2386                         BAS_TIMEOUT*HZ/10);
2387         gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
2388
2389         /* check for conditions preventing suspend */
2390         if (ucs->basstate & (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)) {
2391                 dev_warn(cs->dev, "cannot suspend:\n");
2392                 if (ucs->basstate & BS_B1OPEN)
2393                         dev_warn(cs->dev, " B channel 1 open\n");
2394                 if (ucs->basstate & BS_B2OPEN)
2395                         dev_warn(cs->dev, " B channel 2 open\n");
2396                 if (ucs->basstate & BS_ATRDPEND)
2397                         dev_warn(cs->dev, " receiving AT reply\n");
2398                 if (ucs->basstate & BS_ATWRPEND)
2399                         dev_warn(cs->dev, " sending AT command\n");
2400                 update_basstate(ucs, 0, BS_SUSPEND);
2401                 return -EBUSY;
2402         }
2403
2404         /* close AT channel if open */
2405         if (ucs->basstate & BS_ATOPEN) {
2406                 gig_dbg(DEBUG_SUSPEND, "closing AT channel");
2407                 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
2408                 if (rc) {
2409                         update_basstate(ucs, 0, BS_SUSPEND);
2410                         return rc;
2411                 }
2412                 wait_event_timeout(ucs->waitqueue, !ucs->pending,
2413                                    BAS_TIMEOUT*HZ/10);
2414                 /* in case of timeout, proceed anyway */
2415         }
2416
2417         /* kill all URBs and timers that might still be pending */
2418         usb_kill_urb(ucs->urb_ctrl);
2419         usb_kill_urb(ucs->urb_int_in);
2420         del_timer_sync(&ucs->timer_ctrl);
2421
2422         gig_dbg(DEBUG_SUSPEND, "suspend complete");
2423         return 0;
2424 }
2425
2426 /* gigaset_resume
2427  * This function is called after the USB connection has been resumed.
2428  */
2429 static int gigaset_resume(struct usb_interface *intf)
2430 {
2431         struct cardstate *cs = usb_get_intfdata(intf);
2432         struct bas_cardstate *ucs = cs->hw.bas;
2433         int rc;
2434
2435         /* resubmit interrupt URB for spontaneous messages from base */
2436         rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2437         if (rc) {
2438                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
2439                         get_usb_rcmsg(rc));
2440                 return rc;
2441         }
2442
2443         /* clear suspend flag to reallow activity */
2444         update_basstate(ucs, 0, BS_SUSPEND);
2445
2446         gig_dbg(DEBUG_SUSPEND, "resume complete");
2447         return 0;
2448 }
2449
2450 /* gigaset_pre_reset
2451  * This function is called before the USB connection is reset.
2452  */
2453 static int gigaset_pre_reset(struct usb_interface *intf)
2454 {
2455         /* handle just like suspend */
2456         return gigaset_suspend(intf, PMSG_ON);
2457 }
2458
2459 /* gigaset_post_reset
2460  * This function is called after the USB connection has been reset.
2461  */
2462 static int gigaset_post_reset(struct usb_interface *intf)
2463 {
2464         /* FIXME: send HD_DEVICE_INIT_ACK? */
2465
2466         /* resume operations */
2467         return gigaset_resume(intf);
2468 }
2469
2470
2471 static const struct gigaset_ops gigops = {
2472         gigaset_write_cmd,
2473         gigaset_write_room,
2474         gigaset_chars_in_buffer,
2475         gigaset_brkchars,
2476         gigaset_init_bchannel,
2477         gigaset_close_bchannel,
2478         gigaset_initbcshw,
2479         gigaset_freebcshw,
2480         gigaset_reinitbcshw,
2481         gigaset_initcshw,
2482         gigaset_freecshw,
2483         gigaset_set_modem_ctrl,
2484         gigaset_baud_rate,
2485         gigaset_set_line_ctrl,
2486         gigaset_isoc_send_skb,
2487         gigaset_isoc_input,
2488 };
2489
2490 /* bas_gigaset_init
2491  * This function is called after the kernel module is loaded.
2492  */
2493 static int __init bas_gigaset_init(void)
2494 {
2495         int result;
2496
2497         /* allocate memory for our driver state and intialize it */
2498         if ((driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2499                                        GIGASET_MODULENAME, GIGASET_DEVNAME,
2500                                        &gigops, THIS_MODULE)) == NULL)
2501                 goto error;
2502
2503         /* register this driver with the USB subsystem */
2504         result = usb_register(&gigaset_usb_driver);
2505         if (result < 0) {
2506                 err("usb_register failed (error %d)", -result);
2507                 goto error;
2508         }
2509
2510         info(DRIVER_AUTHOR);
2511         info(DRIVER_DESC);
2512         return 0;
2513
2514 error:
2515         if (driver)
2516                 gigaset_freedriver(driver);
2517         driver = NULL;
2518         return -1;
2519 }
2520
2521 /* bas_gigaset_exit
2522  * This function is called before the kernel module is unloaded.
2523  */
2524 static void __exit bas_gigaset_exit(void)
2525 {
2526         struct bas_cardstate *ucs;
2527         int i;
2528
2529         gigaset_blockdriver(driver); /* => probe will fail
2530                                       * => no gigaset_start any more
2531                                       */
2532
2533         /* stop all connected devices */
2534         for (i = 0; i < driver->minors; i++) {
2535                 if (gigaset_shutdown(driver->cs + i) < 0)
2536                         continue;               /* no device */
2537                 /* from now on, no isdn callback should be possible */
2538
2539                 /* close all still open channels */
2540                 ucs = driver->cs[i].hw.bas;
2541                 if (ucs->basstate & BS_B1OPEN) {
2542                         gig_dbg(DEBUG_INIT, "closing B1 channel");
2543                         usb_control_msg(ucs->udev,
2544                                         usb_sndctrlpipe(ucs->udev, 0),
2545                                         HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
2546                                         0, 0, NULL, 0, BAS_TIMEOUT);
2547                 }
2548                 if (ucs->basstate & BS_B2OPEN) {
2549                         gig_dbg(DEBUG_INIT, "closing B2 channel");
2550                         usb_control_msg(ucs->udev,
2551                                         usb_sndctrlpipe(ucs->udev, 0),
2552                                         HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
2553                                         0, 0, NULL, 0, BAS_TIMEOUT);
2554                 }
2555                 if (ucs->basstate & BS_ATOPEN) {
2556                         gig_dbg(DEBUG_INIT, "closing AT channel");
2557                         usb_control_msg(ucs->udev,
2558                                         usb_sndctrlpipe(ucs->udev, 0),
2559                                         HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
2560                                         0, 0, NULL, 0, BAS_TIMEOUT);
2561                 }
2562                 ucs->basstate = 0;
2563         }
2564
2565         /* deregister this driver with the USB subsystem */
2566         usb_deregister(&gigaset_usb_driver);
2567         /* this will call the disconnect-callback */
2568         /* from now on, no disconnect/probe callback should be running */
2569
2570         gigaset_freedriver(driver);
2571         driver = NULL;
2572 }
2573
2574
2575 module_init(bas_gigaset_init);
2576 module_exit(bas_gigaset_exit);
2577
2578 MODULE_AUTHOR(DRIVER_AUTHOR);
2579 MODULE_DESCRIPTION(DRIVER_DESC);
2580 MODULE_LICENSE("GPL");