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 #include <linux/usb.h>
  18 #include <linux/module.h>
  19 #include <linux/moduleparam.h>
  20
  21 /* Version Information */
  22 #define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
  23 #define DRIVER_DESC "USB Driver for Gigaset 307x"
  24
  25
  26 /* Module parameters */
  27
  28 static int startmode = SM_ISDN;
  29 static int cidmode = 1;
  30
  31 module_param(startmode, int, S_IRUGO);
  32 module_param(cidmode, int, S_IRUGO);
  33 MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
  34 MODULE_PARM_DESC(cidmode, "Call-ID mode");
  35
  36 #define GIGASET_MINORS     1
  37 #define GIGASET_MINOR      16
  38 #define GIGASET_MODULENAME "bas_gigaset"
  39 #define GIGASET_DEVNAME    "ttyGB"
  40
  41 /* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
  42 #define IF_WRITEBUF 264
  43
  44 /* interrupt pipe message size according to ibid. ch. 2.2 */
  45 #define IP_MSGSIZE 3
  46
  47 /* Values for the Gigaset 307x */
  48 #define USB_GIGA_VENDOR_ID      0x0681
  49 #define USB_3070_PRODUCT_ID     0x0001
  50 #define USB_3075_PRODUCT_ID     0x0002
  51 #define USB_SX303_PRODUCT_ID    0x0021
  52 #define USB_SX353_PRODUCT_ID    0x0022
  53
  54 /* table of devices that work with this driver */
  55 static const struct usb_device_id gigaset_table[] = {
  56         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3070_PRODUCT_ID) },
  57         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3075_PRODUCT_ID) },
  58         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX303_PRODUCT_ID) },
  59         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX353_PRODUCT_ID) },
  60         { } /* Terminating entry */
  61 };
  62
  63 MODULE_DEVICE_TABLE(usb, gigaset_table);
  64
  65 /*======================= local function prototypes ==========================*/
  66
  67 /* function called if a new device belonging to this driver is connected */
  68 static int gigaset_probe(struct usb_interface *interface,
  69                          const struct usb_device_id *id);
  70
  71 /* Function will be called if the device is unplugged */
  72 static void gigaset_disconnect(struct usb_interface *interface);
  73
  74 /* functions called before/after suspend */
  75 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
  76 static int gigaset_resume(struct usb_interface *intf);
  77
  78 /* functions called before/after device reset */
  79 static int gigaset_pre_reset(struct usb_interface *intf);
  80 static int gigaset_post_reset(struct usb_interface *intf);
  81
  82 static int atread_submit(struct cardstate *, int);
  83 static void stopurbs(struct bas_bc_state *);
  84 static int req_submit(struct bc_state *, int, int, int);
  85 static int atwrite_submit(struct cardstate *, unsigned char *, int);
  86 static int start_cbsend(struct cardstate *);
  87
  88 /*============================================================================*/
  89
  90 struct bas_cardstate {
  91         struct usb_device       *udev;          /* USB device pointer */
  92         struct usb_interface    *interface;     /* interface for this device */
  93         unsigned char           minor;          /* starting minor number */
  94
  95         struct urb              *urb_ctrl;      /* control pipe default URB */
  96         struct usb_ctrlrequest  dr_ctrl;
  97         struct timer_list       timer_ctrl;     /* control request timeout */
  98         int                     retry_ctrl;
  99
 100         struct timer_list       timer_atrdy;    /* AT command ready timeout */
 101         struct urb              *urb_cmd_out;   /* for sending AT commands */
 102         struct usb_ctrlrequest  dr_cmd_out;
 103         int                     retry_cmd_out;
 104
 105         struct urb              *urb_cmd_in;    /* for receiving AT replies */
 106         struct usb_ctrlrequest  dr_cmd_in;
 107         struct timer_list       timer_cmd_in;   /* receive request timeout */
 108         unsigned char           *rcvbuf;        /* AT reply receive buffer */
 109
 110         struct urb              *urb_int_in;    /* URB for interrupt pipe */
 111         unsigned char           *int_in_buf;
 112
 113         spinlock_t              lock;           /* locks all following */
 114         int                     basstate;       /* bitmap (BS_*) */
 115         int                     pending;        /* uncompleted base request */
 116         wait_queue_head_t       waitqueue;
 117         int                     rcvbuf_size;    /* size of AT receive buffer */
 118                                                 /* 0: no receive in progress */
 119         int                     retry_cmd_in;   /* receive req retry count */
 120 };
 121
 122 /* status of direct USB connection to 307x base (bits in basstate) */
 123 #define BS_ATOPEN       0x001   /* AT channel open */
 124 #define BS_B1OPEN       0x002   /* B channel 1 open */
 125 #define BS_B2OPEN       0x004   /* B channel 2 open */
 126 #define BS_ATREADY      0x008   /* base ready for AT command */
 127 #define BS_INIT         0x010   /* base has signalled INIT_OK */
 128 #define BS_ATTIMER      0x020   /* waiting for HD_READY_SEND_ATDATA */
 129 #define BS_ATRDPEND     0x040   /* urb_cmd_in in use */
 130 #define BS_ATWRPEND     0x080   /* urb_cmd_out in use */
 131 #define BS_SUSPEND      0x100   /* USB port suspended */
 132 #define BS_RESETTING    0x200   /* waiting for HD_RESET_INTERRUPT_PIPE_ACK */
 133
 134
 135 static struct gigaset_driver *driver;
 136
 137 /* usb specific object needed to register this driver with the usb subsystem */
 138 static struct usb_driver gigaset_usb_driver = {
 139         .name =         GIGASET_MODULENAME,
 140         .probe =        gigaset_probe,
 141         .disconnect =   gigaset_disconnect,
 142         .id_table =     gigaset_table,
 143         .suspend =      gigaset_suspend,
 144         .resume =       gigaset_resume,
 145         .reset_resume = gigaset_post_reset,
 146         .pre_reset =    gigaset_pre_reset,
 147         .post_reset =   gigaset_post_reset,
 148 };
 149
 150 /* get message text for usb_submit_urb return code
 151  */
 152 static char *get_usb_rcmsg(int rc)
 153 {
 154         static char unkmsg[28];
 155
 156         switch (rc) {
 157         case 0:
 158                 return "success";
 159         case -ENOMEM:
 160                 return "out of memory";
 161         case -ENODEV:
 162                 return "device not present";
 163         case -ENOENT:
 164                 return "endpoint not present";
 165         case -ENXIO:
 166                 return "URB type not supported";
 167         case -EINVAL:
 168                 return "invalid argument";
 169         case -EAGAIN:
 170                 return "start frame too early or too much scheduled";
 171         case -EFBIG:
 172                 return "too many isochronous frames requested";
 173         case -EPIPE:
 174                 return "endpoint stalled";
 175         case -EMSGSIZE:
 176                 return "invalid packet size";
 177         case -ENOSPC:
 178                 return "would overcommit USB bandwidth";
 179         case -ESHUTDOWN:
 180                 return "device shut down";
 181         case -EPERM:
 182                 return "reject flag set";
 183         case -EHOSTUNREACH:
 184                 return "device suspended";
 185         default:
 186                 snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
 187                 return unkmsg;
 188         }
 189 }
 190
 191 /* get message text for USB status code
 192  */
 193 static char *get_usb_statmsg(int status)
 194 {
 195         static char unkmsg[28];
 196
 197         switch (status) {
 198         case 0:
 199                 return "success";
 200         case -ENOENT:
 201                 return "unlinked (sync)";
 202         case -EINPROGRESS:
 203                 return "pending";
 204         case -EPROTO:
 205                 return "bit stuffing error, timeout, or unknown USB error";
 206         case -EILSEQ:
 207                 return "CRC mismatch, timeout, or unknown USB error";
 208         case -ETIME:
 209                 return "timed out";
 210         case -EPIPE:
 211                 return "endpoint stalled";
 212         case -ECOMM:
 213                 return "IN buffer overrun";
 214         case -ENOSR:
 215                 return "OUT buffer underrun";
 216         case -EOVERFLOW:
 217                 return "too much data";
 218         case -EREMOTEIO:
 219                 return "short packet detected";
 220         case -ENODEV:
 221                 return "device removed";
 222         case -EXDEV:
 223                 return "partial isochronous transfer";
 224         case -EINVAL:
 225                 return "invalid argument";
 226         case -ECONNRESET:
 227                 return "unlinked (async)";
 228         case -ESHUTDOWN:
 229                 return "device shut down";
 230         default:
 231                 snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
 232                 return unkmsg;
 233         }
 234 }
 235
 236 /* usb_pipetype_str
 237  * retrieve string representation of USB pipe type
 238  */
 239 static inline char *usb_pipetype_str(int pipe)
 240 {
 241         if (usb_pipeisoc(pipe))
 242                 return "Isoc";
 243         if (usb_pipeint(pipe))
 244                 return "Int";
 245         if (usb_pipecontrol(pipe))
 246                 return "Ctrl";
 247         if (usb_pipebulk(pipe))
 248                 return "Bulk";
 249         return "?";
 250 }
 251
 252 /* dump_urb
 253  * write content of URB to syslog for debugging
 254  */
 255 static inline void dump_urb(enum debuglevel level, const char *tag,
 256                             struct urb *urb)
 257 {
 258 #ifdef CONFIG_GIGASET_DEBUG
 259         int i;
 260         gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
 261         if (urb) {
 262                 gig_dbg(level,
 263                         "  dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
 264                         "hcpriv=0x%08lx, transfer_flags=0x%x,",
 265                         (unsigned long) urb->dev,
 266                         usb_pipetype_str(urb->pipe),
 267                         usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
 268                         usb_pipein(urb->pipe) ? "in" : "out",
 269                         (unsigned long) urb->hcpriv,
 270                         urb->transfer_flags);
 271                 gig_dbg(level,
 272                         "  transfer_buffer=0x%08lx[%d], actual_length=%d, "
 273                         "setup_packet=0x%08lx,",
 274                         (unsigned long) urb->transfer_buffer,
 275                         urb->transfer_buffer_length, urb->actual_length,
 276                         (unsigned long) urb->setup_packet);
 277                 gig_dbg(level,
 278                         "  start_frame=%d, number_of_packets=%d, interval=%d, "
 279                         "error_count=%d,",
 280                         urb->start_frame, urb->number_of_packets, urb->interval,
 281                         urb->error_count);
 282                 gig_dbg(level,
 283                         "  context=0x%08lx, complete=0x%08lx, "
 284                         "iso_frame_desc[]={",
 285                         (unsigned long) urb->context,
 286                         (unsigned long) urb->complete);
 287                 for (i = 0; i < urb->number_of_packets; i++) {
 288                         struct usb_iso_packet_descriptor *pifd
 289                                 = &urb->iso_frame_desc[i];
 290                         gig_dbg(level,
 291                                 "    {offset=%u, length=%u, actual_length=%u, "
 292                                 "status=%u}",
 293                                 pifd->offset, pifd->length, pifd->actual_length,
 294                                 pifd->status);
 295                 }
 296         }
 297         gig_dbg(level, "}}");
 298 #endif
 299 }
 300
 301 /* read/set modem control bits etc. (m10x only) */
 302 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
 303                                   unsigned new_state)
 304 {
 305         return -EINVAL;
 306 }
 307
 308 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
 309 {
 310         return -EINVAL;
 311 }
 312
 313 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
 314 {
 315         return -EINVAL;
 316 }
 317
 318 /* set/clear bits in base connection state, return previous state
 319  */
 320 static inline int update_basstate(struct bas_cardstate *ucs,
 321                                   int set, int clear)
 322 {
 323         unsigned long flags;
 324         int state;
 325
 326         spin_lock_irqsave(&ucs->lock, flags);
 327         state = ucs->basstate;
 328         ucs->basstate = (state & ~clear) | set;
 329         spin_unlock_irqrestore(&ucs->lock, flags);
 330         return state;
 331 }
 332
 333 /* error_hangup
 334  * hang up any existing connection because of an unrecoverable error
 335  * This function may be called from any context and takes care of scheduling
 336  * the necessary actions for execution outside of interrupt context.
 337  * cs->lock must not be held.
 338  * argument:
 339  *      B channel control structure
 340  */
 341 static inline void error_hangup(struct bc_state *bcs)
 342 {
 343         struct cardstate *cs = bcs->cs;
 344
 345         gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL);
 346         gigaset_schedule_event(cs);
 347 }
 348
 349 /* error_reset
 350  * reset Gigaset device because of an unrecoverable error
 351  * This function may be called from any context, and takes care of
 352  * scheduling the necessary actions for execution outside of interrupt context.
 353  * cs->lock must not be held.
 354  * argument:
 355  *      controller state structure
 356  */
 357 static inline void error_reset(struct cardstate *cs)
 358 {
 359         /* reset interrupt pipe to recover (ignore errors) */
 360         update_basstate(cs->hw.bas, BS_RESETTING, 0);
 361         req_submit(cs->bcs, HD_RESET_INTERRUPT_PIPE, 0, BAS_TIMEOUT);
 362 }
 363
 364 /* check_pending
 365  * check for completion of pending control request
 366  * parameter:
 367  *      ucs     hardware specific controller state structure
 368  */
 369 static void check_pending(struct bas_cardstate *ucs)
 370 {
 371         unsigned long flags;
 372
 373         spin_lock_irqsave(&ucs->lock, flags);
 374         switch (ucs->pending) {
 375         case 0:
 376                 break;
 377         case HD_OPEN_ATCHANNEL:
 378                 if (ucs->basstate & BS_ATOPEN)
 379                         ucs->pending = 0;
 380                 break;
 381         case HD_OPEN_B1CHANNEL:
 382                 if (ucs->basstate & BS_B1OPEN)
 383                         ucs->pending = 0;
 384                 break;
 385         case HD_OPEN_B2CHANNEL:
 386                 if (ucs->basstate & BS_B2OPEN)
 387                         ucs->pending = 0;
 388                 break;
 389         case HD_CLOSE_ATCHANNEL:
 390                 if (!(ucs->basstate & BS_ATOPEN))
 391                         ucs->pending = 0;
 392                 break;
 393         case HD_CLOSE_B1CHANNEL:
 394                 if (!(ucs->basstate & BS_B1OPEN))
 395                         ucs->pending = 0;
 396                 break;
 397         case HD_CLOSE_B2CHANNEL:
 398                 if (!(ucs->basstate & BS_B2OPEN))
 399                         ucs->pending = 0;
 400                 break;
 401         case HD_DEVICE_INIT_ACK:                /* no reply expected */
 402                 ucs->pending = 0;
 403                 break;
 404         case HD_RESET_INTERRUPT_PIPE:
 405                 if (!(ucs->basstate & BS_RESETTING))
 406                         ucs->pending = 0;
 407                 break;
 408         /*
 409          * HD_READ_ATMESSAGE and HD_WRITE_ATMESSAGE are handled separately
 410          * and should never end up here
 411          */
 412         default:
 413                 dev_warn(&ucs->interface->dev,
 414                          "unknown pending request 0x%02x cleared\n",
 415                          ucs->pending);
 416                 ucs->pending = 0;
 417         }
 418
 419         if (!ucs->pending)
 420                 del_timer(&ucs->timer_ctrl);
 421
 422         spin_unlock_irqrestore(&ucs->lock, flags);
 423 }
 424
 425 /* cmd_in_timeout
 426  * timeout routine for command input request
 427  * argument:
 428  *      controller state structure
 429  */
 430 static void cmd_in_timeout(unsigned long data)
 431 {
 432         struct cardstate *cs = (struct cardstate *) data;
 433         struct bas_cardstate *ucs = cs->hw.bas;
 434         int rc;
 435
 436         if (!ucs->rcvbuf_size) {
 437                 gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
 438                 return;
 439         }
 440
 441         if (ucs->retry_cmd_in++ < BAS_RETRY) {
 442                 dev_notice(cs->dev, "control read: timeout, retry %d\n",
 443                            ucs->retry_cmd_in);
 444                 rc = atread_submit(cs, BAS_TIMEOUT);
 445                 if (rc >= 0 || rc == -ENODEV)
 446                         /* resubmitted or disconnected */
 447                         /* - bypass regular exit block */
 448                         return;
 449         } else {
 450                 dev_err(cs->dev,
 451                         "control read: timeout, giving up after %d tries\n",
 452                         ucs->retry_cmd_in);
 453         }
 454         kfree(ucs->rcvbuf);
 455         ucs->rcvbuf = NULL;
 456         ucs->rcvbuf_size = 0;
 457         error_reset(cs);
 458 }
 459
 460 /* read_ctrl_callback
 461  * USB completion handler for control pipe input
 462  * called by the USB subsystem in interrupt context
 463  * parameter:
 464  *      urb     USB request block
 465  *              urb->context = inbuf structure for controller state
 466  */
 467 static void read_ctrl_callback(struct urb *urb)
 468 {
 469         struct inbuf_t *inbuf = urb->context;
 470         struct cardstate *cs = inbuf->cs;
 471         struct bas_cardstate *ucs = cs->hw.bas;
 472         int status = urb->status;
 473         int have_data = 0;
 474         unsigned numbytes;
 475         int rc;
 476
 477         update_basstate(ucs, 0, BS_ATRDPEND);
 478         wake_up(&ucs->waitqueue);
 479
 480         if (!ucs->rcvbuf_size) {
 481                 dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
 482                 return;
 483         }
 484
 485         del_timer(&ucs->timer_cmd_in);
 486
 487         switch (status) {
 488         case 0:                         /* normal completion */
 489                 numbytes = urb->actual_length;
 490                 if (unlikely(numbytes != ucs->rcvbuf_size)) {
 491                         dev_warn(cs->dev,
 492                                "control read: received %d chars, expected %d\n",
 493                                  numbytes, ucs->rcvbuf_size);
 494                         if (numbytes > ucs->rcvbuf_size)
 495                                 numbytes = ucs->rcvbuf_size;
 496                 }
 497
 498                 /* copy received bytes to inbuf */
 499                 have_data = gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes);
 500
 501                 if (unlikely(numbytes < ucs->rcvbuf_size)) {
 502                         /* incomplete - resubmit for remaining bytes */
 503                         ucs->rcvbuf_size -= numbytes;
 504                         ucs->retry_cmd_in = 0;
 505                         rc = atread_submit(cs, BAS_TIMEOUT);
 506                         if (rc >= 0 || rc == -ENODEV)
 507                                 /* resubmitted or disconnected */
 508                                 /* - bypass regular exit block */
 509                                 return;
 510                         error_reset(cs);
 511                 }
 512                 break;
 513
 514         case -ENOENT:                   /* cancelled */
 515         case -ECONNRESET:               /* cancelled (async) */
 516         case -EINPROGRESS:              /* pending */
 517         case -ENODEV:                   /* device removed */
 518         case -ESHUTDOWN:                /* device shut down */
 519                 /* no action necessary */
 520                 gig_dbg(DEBUG_USBREQ, "%s: %s",
 521                         __func__, get_usb_statmsg(status));
 522                 break;
 523
 524         default:                        /* severe trouble */
 525                 dev_warn(cs->dev, "control read: %s\n",
 526                          get_usb_statmsg(status));
 527                 if (ucs->retry_cmd_in++ < BAS_RETRY) {
 528                         dev_notice(cs->dev, "control read: retry %d\n",
 529                                    ucs->retry_cmd_in);
 530                         rc = atread_submit(cs, BAS_TIMEOUT);
 531                         if (rc >= 0 || rc == -ENODEV)
 532                                 /* resubmitted or disconnected */
 533                                 /* - bypass regular exit block */
 534                                 return;
 535                 } else {
 536                         dev_err(cs->dev,
 537                                 "control read: giving up after %d tries\n",
 538                                 ucs->retry_cmd_in);
 539                 }
 540                 error_reset(cs);
 541         }
 542
 543         kfree(ucs->rcvbuf);
 544         ucs->rcvbuf = NULL;
 545         ucs->rcvbuf_size = 0;
 546         if (have_data) {
 547                 gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
 548                 gigaset_schedule_event(cs);
 549         }
 550 }
 551
 552 /* atread_submit
 553  * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
 554  * parameters:
 555  *      cs      controller state structure
 556  *      timeout timeout in 1/10 sec., 0: none
 557  * return value:
 558  *      0 on success
 559  *      -EBUSY if another request is pending
 560  *      any URB submission error code
 561  */
 562 static int atread_submit(struct cardstate *cs, int timeout)
 563 {
 564         struct bas_cardstate *ucs = cs->hw.bas;
 565         int basstate;
 566         int ret;
 567
 568         gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
 569                 ucs->rcvbuf_size);
 570
 571         basstate = update_basstate(ucs, BS_ATRDPEND, 0);
 572         if (basstate & BS_ATRDPEND) {
 573                 dev_err(cs->dev,
 574                         "could not submit HD_READ_ATMESSAGE: URB busy\n");
 575                 return -EBUSY;
 576         }
 577
 578         if (basstate & BS_SUSPEND) {
 579                 dev_notice(cs->dev,
 580                            "HD_READ_ATMESSAGE not submitted, "
 581                            "suspend in progress\n");
 582                 update_basstate(ucs, 0, BS_ATRDPEND);
 583                 /* treat like disconnect */
 584                 return -ENODEV;
 585         }
 586
 587         ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
 588         ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
 589         ucs->dr_cmd_in.wValue = 0;
 590         ucs->dr_cmd_in.wIndex = 0;
 591         ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
 592         usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
 593                              usb_rcvctrlpipe(ucs->udev, 0),
 594                              (unsigned char *) &ucs->dr_cmd_in,
 595                              ucs->rcvbuf, ucs->rcvbuf_size,
 596                              read_ctrl_callback, cs->inbuf);
 597
 598         ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC);
 599         if (ret != 0) {
 600                 update_basstate(ucs, 0, BS_ATRDPEND);
 601                 dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
 602                         get_usb_rcmsg(ret));
 603                 return ret;
 604         }
 605
 606         if (timeout > 0) {
 607                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
 608                 ucs->timer_cmd_in.expires = jiffies + timeout * HZ / 10;
 609                 ucs->timer_cmd_in.data = (unsigned long) cs;
 610                 ucs->timer_cmd_in.function = cmd_in_timeout;
 611                 add_timer(&ucs->timer_cmd_in);
 612         }
 613         return 0;
 614 }
 615
 616 /* read_int_callback
 617  * USB completion handler for interrupt pipe input
 618  * called by the USB subsystem in interrupt context
 619  * parameter:
 620  *      urb     USB request block
 621  *              urb->context = controller state structure
 622  */
 623 static void read_int_callback(struct urb *urb)
 624 {
 625         struct cardstate *cs = urb->context;
 626         struct bas_cardstate *ucs = cs->hw.bas;
 627         struct bc_state *bcs;
 628         int status = urb->status;
 629         unsigned long flags;
 630         int rc;
 631         unsigned l;
 632         int channel;
 633
 634         switch (status) {
 635         case 0:                 /* success */
 636                 break;
 637         case -ENOENT:                   /* cancelled */
 638         case -ECONNRESET:               /* cancelled (async) */
 639         case -EINPROGRESS:              /* pending */
 640                 /* ignore silently */
 641                 gig_dbg(DEBUG_USBREQ, "%s: %s",
 642                         __func__, get_usb_statmsg(status));
 643                 return;
 644         case -ENODEV:                   /* device removed */
 645         case -ESHUTDOWN:                /* device shut down */
 646                 gig_dbg(DEBUG_USBREQ, "%s: device disconnected", __func__);
 647                 return;
 648         default:                /* severe trouble */
 649                 dev_warn(cs->dev, "interrupt read: %s\n",
 650                          get_usb_statmsg(status));
 651                 goto resubmit;
 652         }
 653
 654         /* drop incomplete packets even if the missing bytes wouldn't matter */
 655         if (unlikely(urb->actual_length < IP_MSGSIZE)) {
 656                 dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
 657                          urb->actual_length);
 658                 goto resubmit;
 659         }
 660
 661         l = (unsigned) ucs->int_in_buf[1] +
 662             (((unsigned) ucs->int_in_buf[2]) << 8);
 663
 664         gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
 665                 urb->actual_length, (int)ucs->int_in_buf[0], l,
 666                 (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
 667
 668         channel = 0;
 669
 670         switch (ucs->int_in_buf[0]) {
 671         case HD_DEVICE_INIT_OK:
 672                 update_basstate(ucs, BS_INIT, 0);
 673                 break;
 674
 675         case HD_READY_SEND_ATDATA:
 676                 del_timer(&ucs->timer_atrdy);
 677                 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
 678                 start_cbsend(cs);
 679                 break;
 680
 681         case HD_OPEN_B2CHANNEL_ACK:
 682                 ++channel;
 683         case HD_OPEN_B1CHANNEL_ACK:
 684                 bcs = cs->bcs + channel;
 685                 update_basstate(ucs, BS_B1OPEN << channel, 0);
 686                 gigaset_bchannel_up(bcs);
 687                 break;
 688
 689         case HD_OPEN_ATCHANNEL_ACK:
 690                 update_basstate(ucs, BS_ATOPEN, 0);
 691                 start_cbsend(cs);
 692                 break;
 693
 694         case HD_CLOSE_B2CHANNEL_ACK:
 695                 ++channel;
 696         case HD_CLOSE_B1CHANNEL_ACK:
 697                 bcs = cs->bcs + channel;
 698                 update_basstate(ucs, 0, BS_B1OPEN << channel);
 699                 stopurbs(bcs->hw.bas);
 700                 gigaset_bchannel_down(bcs);
 701                 break;
 702
 703         case HD_CLOSE_ATCHANNEL_ACK:
 704                 update_basstate(ucs, 0, BS_ATOPEN);
 705                 break;
 706
 707         case HD_B2_FLOW_CONTROL:
 708                 ++channel;
 709         case HD_B1_FLOW_CONTROL:
 710                 bcs = cs->bcs + channel;
 711                 atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
 712                            &bcs->hw.bas->corrbytes);
 713                 gig_dbg(DEBUG_ISO,
 714                         "Flow control (channel %d, sub %d): 0x%02x => %d",
 715                         channel, bcs->hw.bas->numsub, l,
 716                         atomic_read(&bcs->hw.bas->corrbytes));
 717                 break;
 718
 719         case HD_RECEIVEATDATA_ACK:      /* AT response ready to be received */
 720                 if (!l) {
 721                         dev_warn(cs->dev,
 722                                 "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
 723                         break;
 724                 }
 725                 spin_lock_irqsave(&cs->lock, flags);
 726                 if (ucs->rcvbuf_size) {
 727                         /* throw away previous buffer - we have no queue */
 728                         dev_err(cs->dev,
 729                                 "receive AT data overrun, %d bytes lost\n",
 730                                 ucs->rcvbuf_size);
 731                         kfree(ucs->rcvbuf);
 732                         ucs->rcvbuf_size = 0;
 733                 }
 734                 ucs->rcvbuf = kmalloc(l, GFP_ATOMIC);
 735                 if (ucs->rcvbuf == NULL) {
 736                         spin_unlock_irqrestore(&cs->lock, flags);
 737                         dev_err(cs->dev, "out of memory receiving AT data\n");
 738                         error_reset(cs);
 739                         break;
 740                 }
 741                 ucs->rcvbuf_size = l;
 742                 ucs->retry_cmd_in = 0;
 743                 rc = atread_submit(cs, BAS_TIMEOUT);
 744                 if (rc < 0) {
 745                         kfree(ucs->rcvbuf);
 746                         ucs->rcvbuf = NULL;
 747                         ucs->rcvbuf_size = 0;
 748                         if (rc != -ENODEV) {
 749                                 spin_unlock_irqrestore(&cs->lock, flags);
 750                                 error_reset(cs);
 751                                 break;
 752                         }
 753                 }
 754                 spin_unlock_irqrestore(&cs->lock, flags);
 755                 break;
 756
 757         case HD_RESET_INTERRUPT_PIPE_ACK:
 758                 update_basstate(ucs, 0, BS_RESETTING);
 759                 dev_notice(cs->dev, "interrupt pipe reset\n");
 760                 break;
 761
 762         case HD_SUSPEND_END:
 763                 gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
 764                 break;
 765
 766         default:
 767                 dev_warn(cs->dev,
 768                          "unknown Gigaset signal 0x%02x (%u) ignored\n",
 769                          (int) ucs->int_in_buf[0], l);
 770         }
 771
 772         check_pending(ucs);
 773         wake_up(&ucs->waitqueue);
 774
 775 resubmit:
 776         rc = usb_submit_urb(urb, GFP_ATOMIC);
 777         if (unlikely(rc != 0 && rc != -ENODEV)) {
 778                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
 779                         get_usb_rcmsg(rc));
 780                 error_reset(cs);
 781         }
 782 }
 783
 784 /* read_iso_callback
 785  * USB completion handler for B channel isochronous input
 786  * called by the USB subsystem in interrupt context
 787  * parameter:
 788  *      urb     USB request block of completed request
 789  *              urb->context = bc_state structure
 790  */
 791 static void read_iso_callback(struct urb *urb)
 792 {
 793         struct bc_state *bcs;
 794         struct bas_bc_state *ubc;
 795         int status = urb->status;
 796         unsigned long flags;
 797         int i, rc;
 798
 799         /* status codes not worth bothering the tasklet with */
 800         if (unlikely(status == -ENOENT ||
 801                      status == -ECONNRESET ||
 802                      status == -EINPROGRESS ||
 803                      status == -ENODEV ||
 804                      status == -ESHUTDOWN)) {
 805                 gig_dbg(DEBUG_ISO, "%s: %s",
 806                         __func__, get_usb_statmsg(status));
 807                 return;
 808         }
 809
 810         bcs = urb->context;
 811         ubc = bcs->hw.bas;
 812
 813         spin_lock_irqsave(&ubc->isoinlock, flags);
 814         if (likely(ubc->isoindone == NULL)) {
 815                 /* pass URB to tasklet */
 816                 ubc->isoindone = urb;
 817                 ubc->isoinstatus = status;
 818                 tasklet_hi_schedule(&ubc->rcvd_tasklet);
 819         } else {
 820                 /* tasklet still busy, drop data and resubmit URB */
 821                 ubc->loststatus = status;
 822                 for (i = 0; i < BAS_NUMFRAMES; i++) {
 823                         ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
 824                         if (unlikely(urb->iso_frame_desc[i].status != 0 &&
 825                                      urb->iso_frame_desc[i].status !=
 826                                                                 -EINPROGRESS))
 827                                 ubc->loststatus = urb->iso_frame_desc[i].status;
 828                         urb->iso_frame_desc[i].status = 0;
 829                         urb->iso_frame_desc[i].actual_length = 0;
 830                 }
 831                 if (likely(ubc->running)) {
 832                         /* urb->dev is clobbered by USB subsystem */
 833                         urb->dev = bcs->cs->hw.bas->udev;
 834                         urb->transfer_flags = URB_ISO_ASAP;
 835                         urb->number_of_packets = BAS_NUMFRAMES;
 836                         gig_dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit",
 837                                 __func__);
 838                         rc = usb_submit_urb(urb, GFP_ATOMIC);
 839                         if (unlikely(rc != 0 && rc != -ENODEV)) {
 840                                 dev_err(bcs->cs->dev,
 841                                         "could not resubmit isochronous read "
 842                                         "URB: %s\n", get_usb_rcmsg(rc));
 843                                 dump_urb(DEBUG_ISO, "isoc read", urb);
 844                                 error_hangup(bcs);
 845                         }
 846                 }
 847         }
 848         spin_unlock_irqrestore(&ubc->isoinlock, flags);
 849 }
 850
 851 /* write_iso_callback
 852  * USB completion handler for B channel isochronous output
 853  * called by the USB subsystem in interrupt context
 854  * parameter:
 855  *      urb     USB request block of completed request
 856  *              urb->context = isow_urbctx_t structure
 857  */
 858 static void write_iso_callback(struct urb *urb)
 859 {
 860         struct isow_urbctx_t *ucx;
 861         struct bas_bc_state *ubc;
 862         int status = urb->status;
 863         unsigned long flags;
 864
 865         /* status codes not worth bothering the tasklet with */
 866         if (unlikely(status == -ENOENT ||
 867                      status == -ECONNRESET ||
 868                      status == -EINPROGRESS ||
 869                      status == -ENODEV ||
 870                      status == -ESHUTDOWN)) {
 871                 gig_dbg(DEBUG_ISO, "%s: %s",
 872                         __func__, get_usb_statmsg(status));
 873                 return;
 874         }
 875
 876         /* pass URB context to tasklet */
 877         ucx = urb->context;
 878         ubc = ucx->bcs->hw.bas;
 879         ucx->status = status;
 880
 881         spin_lock_irqsave(&ubc->isooutlock, flags);
 882         ubc->isooutovfl = ubc->isooutdone;
 883         ubc->isooutdone = ucx;
 884         spin_unlock_irqrestore(&ubc->isooutlock, flags);
 885         tasklet_hi_schedule(&ubc->sent_tasklet);
 886 }
 887
 888 /* starturbs
 889  * prepare and submit USB request blocks for isochronous input and output
 890  * argument:
 891  *      B channel control structure
 892  * return value:
 893  *      0 on success
 894  *      < 0 on error (no URBs submitted)
 895  */
 896 static int starturbs(struct bc_state *bcs)
 897 {
 898         struct bas_bc_state *ubc = bcs->hw.bas;
 899         struct urb *urb;
 900         int j, k;
 901         int rc;
 902
 903         /* initialize L2 reception */
 904         if (bcs->proto2 == L2_HDLC)
 905                 bcs->inputstate |= INS_flag_hunt;
 906
 907         /* submit all isochronous input URBs */
 908         ubc->running = 1;
 909         for (k = 0; k < BAS_INURBS; k++) {
 910                 urb = ubc->isoinurbs[k];
 911                 if (!urb) {
 912                         rc = -EFAULT;
 913                         goto error;
 914                 }
 915
 916                 urb->dev = bcs->cs->hw.bas->udev;
 917                 urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
 918                 urb->transfer_flags = URB_ISO_ASAP;
 919                 urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
 920                 urb->transfer_buffer_length = BAS_INBUFSIZE;
 921                 urb->number_of_packets = BAS_NUMFRAMES;
 922                 urb->interval = BAS_FRAMETIME;
 923                 urb->complete = read_iso_callback;
 924                 urb->context = bcs;
 925                 for (j = 0; j < BAS_NUMFRAMES; j++) {
 926                         urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
 927                         urb->iso_frame_desc[j].length = BAS_MAXFRAME;
 928                         urb->iso_frame_desc[j].status = 0;
 929                         urb->iso_frame_desc[j].actual_length = 0;
 930                 }
 931
 932                 dump_urb(DEBUG_ISO, "Initial isoc read", urb);
 933                 rc = usb_submit_urb(urb, GFP_ATOMIC);
 934                 if (rc != 0)
 935                         goto error;
 936         }
 937
 938         /* initialize L2 transmission */
 939         gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
 940
 941         /* set up isochronous output URBs for flag idling */
 942         for (k = 0; k < BAS_OUTURBS; ++k) {
 943                 urb = ubc->isoouturbs[k].urb;
 944                 if (!urb) {
 945                         rc = -EFAULT;
 946                         goto error;
 947                 }
 948                 urb->dev = bcs->cs->hw.bas->udev;
 949                 urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
 950                 urb->transfer_flags = URB_ISO_ASAP;
 951                 urb->transfer_buffer = ubc->isooutbuf->data;
 952                 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
 953                 urb->number_of_packets = BAS_NUMFRAMES;
 954                 urb->interval = BAS_FRAMETIME;
 955                 urb->complete = write_iso_callback;
 956                 urb->context = &ubc->isoouturbs[k];
 957                 for (j = 0; j < BAS_NUMFRAMES; ++j) {
 958                         urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
 959                         urb->iso_frame_desc[j].length = BAS_NORMFRAME;
 960                         urb->iso_frame_desc[j].status = 0;
 961                         urb->iso_frame_desc[j].actual_length = 0;
 962                 }
 963                 ubc->isoouturbs[k].limit = -1;
 964         }
 965
 966         /* keep one URB free, submit the others */
 967         for (k = 0; k < BAS_OUTURBS-1; ++k) {
 968                 dump_urb(DEBUG_ISO, "Initial isoc write", urb);
 969                 rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
 970                 if (rc != 0)
 971                         goto error;
 972         }
 973         dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
 974         ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS-1];
 975         ubc->isooutdone = ubc->isooutovfl = NULL;
 976         return 0;
 977  error:
 978         stopurbs(ubc);
 979         return rc;
 980 }
 981
 982 /* stopurbs
 983  * cancel the USB request blocks for isochronous input and output
 984  * errors are silently ignored
 985  * argument:
 986  *      B channel control structure
 987  */
 988 static void stopurbs(struct bas_bc_state *ubc)
 989 {
 990         int k, rc;
 991
 992         ubc->running = 0;
 993
 994         for (k = 0; k < BAS_INURBS; ++k) {
 995                 rc = usb_unlink_urb(ubc->isoinurbs[k]);
 996                 gig_dbg(DEBUG_ISO,
 997                         "%s: isoc input URB %d unlinked, result = %s",
 998                         __func__, k, get_usb_rcmsg(rc));
 999         }
1000
1001         for (k = 0; k < BAS_OUTURBS; ++k) {
1002                 rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
1003                 gig_dbg(DEBUG_ISO,
1004                         "%s: isoc output URB %d unlinked, result = %s",
1005                         __func__, k, get_usb_rcmsg(rc));
1006         }
1007 }
1008
1009 /* Isochronous Write - Bottom Half */
1010 /* =============================== */
1011
1012 /* submit_iso_write_urb
1013  * fill and submit the next isochronous write URB
1014  * parameters:
1015  *      ucx     context structure containing URB
1016  * return value:
1017  *      number of frames submitted in URB
1018  *      0 if URB not submitted because no data available (isooutbuf busy)
1019  *      error code < 0 on error
1020  */
1021 static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
1022 {
1023         struct urb *urb = ucx->urb;
1024         struct bas_bc_state *ubc = ucx->bcs->hw.bas;
1025         struct usb_iso_packet_descriptor *ifd;
1026         int corrbytes, nframe, rc;
1027
1028         /* urb->dev is clobbered by USB subsystem */
1029         urb->dev = ucx->bcs->cs->hw.bas->udev;
1030         urb->transfer_flags = URB_ISO_ASAP;
1031         urb->transfer_buffer = ubc->isooutbuf->data;
1032         urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1033
1034         for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
1035                 ifd = &urb->iso_frame_desc[nframe];
1036
1037                 /* compute frame length according to flow control */
1038                 ifd->length = BAS_NORMFRAME;
1039                 corrbytes = atomic_read(&ubc->corrbytes);
1040                 if (corrbytes != 0) {
1041                         gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
1042                                 __func__, corrbytes);
1043                         if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
1044                                 corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
1045                         else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
1046                                 corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
1047                         ifd->length += corrbytes;
1048                         atomic_add(-corrbytes, &ubc->corrbytes);
1049                 }
1050
1051                 /* retrieve block of data to send */
1052                 rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
1053                 if (rc < 0) {
1054                         if (rc == -EBUSY) {
1055                                 gig_dbg(DEBUG_ISO,
1056                                         "%s: buffer busy at frame %d",
1057                                         __func__, nframe);
1058                                 /* tasklet will be restarted from
1059                                    gigaset_isoc_send_skb() */
1060                         } else {
1061                                 dev_err(ucx->bcs->cs->dev,
1062                                         "%s: buffer error %d at frame %d\n",
1063                                         __func__, rc, nframe);
1064                                 return rc;
1065                         }
1066                         break;
1067                 }
1068                 ifd->offset = rc;
1069                 ucx->limit = ubc->isooutbuf->nextread;
1070                 ifd->status = 0;
1071                 ifd->actual_length = 0;
1072         }
1073         if (unlikely(nframe == 0))
1074                 return 0;       /* no data to send */
1075         urb->number_of_packets = nframe;
1076
1077         rc = usb_submit_urb(urb, GFP_ATOMIC);
1078         if (unlikely(rc)) {
1079                 if (rc == -ENODEV)
1080                         /* device removed - give up silently */
1081                         gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
1082                 else
1083                         dev_err(ucx->bcs->cs->dev,
1084                                 "could not submit isochronous write URB: %s\n",
1085                                 get_usb_rcmsg(rc));
1086                 return rc;
1087         }
1088         ++ubc->numsub;
1089         return nframe;
1090 }
1091
1092 /* write_iso_tasklet
1093  * tasklet scheduled when an isochronous output URB from the Gigaset device
1094  * has completed
1095  * parameter:
1096  *      data    B channel state structure
1097  */
1098 static void write_iso_tasklet(unsigned long data)
1099 {
1100         struct bc_state *bcs = (struct bc_state *) data;
1101         struct bas_bc_state *ubc = bcs->hw.bas;
1102         struct cardstate *cs = bcs->cs;
1103         struct isow_urbctx_t *done, *next, *ovfl;
1104         struct urb *urb;
1105         int status;
1106         struct usb_iso_packet_descriptor *ifd;
1107         int offset;
1108         unsigned long flags;
1109         int i;
1110         struct sk_buff *skb;
1111         int len;
1112         int rc;
1113
1114         /* loop while completed URBs arrive in time */
1115         for (;;) {
1116                 if (unlikely(!(ubc->running))) {
1117                         gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1118                         return;
1119                 }
1120
1121                 /* retrieve completed URBs */
1122                 spin_lock_irqsave(&ubc->isooutlock, flags);
1123                 done = ubc->isooutdone;
1124                 ubc->isooutdone = NULL;
1125                 ovfl = ubc->isooutovfl;
1126                 ubc->isooutovfl = NULL;
1127                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1128                 if (ovfl) {
1129                         dev_err(cs->dev, "isochronous write buffer underrun\n");
1130                         error_hangup(bcs);
1131                         break;
1132                 }
1133                 if (!done)
1134                         break;
1135
1136                 /* submit free URB if available */
1137                 spin_lock_irqsave(&ubc->isooutlock, flags);
1138                 next = ubc->isooutfree;
1139                 ubc->isooutfree = NULL;
1140                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1141                 if (next) {
1142                         rc = submit_iso_write_urb(next);
1143                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1144                                 /* could not submit URB, put it back */
1145                                 spin_lock_irqsave(&ubc->isooutlock, flags);
1146                                 if (ubc->isooutfree == NULL) {
1147                                         ubc->isooutfree = next;
1148                                         next = NULL;
1149                                 }
1150                                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1151                                 if (next) {
1152                                         /* couldn't put it back */
1153                                         dev_err(cs->dev,
1154                                               "losing isochronous write URB\n");
1155                                         error_hangup(bcs);
1156                                 }
1157                         }
1158                 }
1159
1160                 /* process completed URB */
1161                 urb = done->urb;
1162                 status = done->status;
1163                 switch (status) {
1164                 case -EXDEV:                    /* partial completion */
1165                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1166                                 __func__);
1167                         /* fall through - what's the difference anyway? */
1168                 case 0:                         /* normal completion */
1169                         /* inspect individual frames
1170                          * assumptions (for lack of documentation):
1171                          * - actual_length bytes of first frame in error are
1172                          *   successfully sent
1173                          * - all following frames are not sent at all
1174                          */
1175                         offset = done->limit;   /* default (no error) */
1176                         for (i = 0; i < BAS_NUMFRAMES; i++) {
1177                                 ifd = &urb->iso_frame_desc[i];
1178                                 if (ifd->status ||
1179                                     ifd->actual_length != ifd->length) {
1180                                         dev_warn(cs->dev,
1181                                              "isochronous write: frame %d: %s, "
1182                                              "only %d of %d bytes sent\n",
1183                                              i, get_usb_statmsg(ifd->status),
1184                                              ifd->actual_length, ifd->length);
1185                                         offset = (ifd->offset +
1186                                                   ifd->actual_length)
1187                                                  % BAS_OUTBUFSIZE;
1188                                         break;
1189                                 }
1190                         }
1191                         break;
1192                 case -EPIPE:                    /* stall - probably underrun */
1193                         dev_err(cs->dev, "isochronous write stalled\n");
1194                         error_hangup(bcs);
1195                         break;
1196                 default:                        /* severe trouble */
1197                         dev_warn(cs->dev, "isochronous write: %s\n",
1198                                  get_usb_statmsg(status));
1199                 }
1200
1201                 /* mark the write buffer area covered by this URB as free */
1202                 if (done->limit >= 0)
1203                         ubc->isooutbuf->read = done->limit;
1204
1205                 /* mark URB as free */
1206                 spin_lock_irqsave(&ubc->isooutlock, flags);
1207                 next = ubc->isooutfree;
1208                 ubc->isooutfree = done;
1209                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1210                 if (next) {
1211                         /* only one URB still active - resubmit one */
1212                         rc = submit_iso_write_urb(next);
1213                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1214                                 /* couldn't submit */
1215                                 error_hangup(bcs);
1216                         }
1217                 }
1218         }
1219
1220         /* process queued SKBs */
1221         while ((skb = skb_dequeue(&bcs->squeue))) {
1222                 /* copy to output buffer, doing L2 encapsulation */
1223                 len = skb->len;
1224                 if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
1225                         /* insufficient buffer space, push back onto queue */
1226                         skb_queue_head(&bcs->squeue, skb);
1227                         gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
1228                                 __func__, skb_queue_len(&bcs->squeue));
1229                         break;
1230                 }
1231                 skb_pull(skb, len);
1232                 gigaset_skb_sent(bcs, skb);
1233                 dev_kfree_skb_any(skb);
1234         }
1235 }
1236
1237 /* Isochronous Read - Bottom Half */
1238 /* ============================== */
1239
1240 /* read_iso_tasklet
1241  * tasklet scheduled when an isochronous input URB from the Gigaset device
1242  * has completed
1243  * parameter:
1244  *      data    B channel state structure
1245  */
1246 static void read_iso_tasklet(unsigned long data)
1247 {
1248         struct bc_state *bcs = (struct bc_state *) data;
1249         struct bas_bc_state *ubc = bcs->hw.bas;
1250         struct cardstate *cs = bcs->cs;
1251         struct urb *urb;
1252         int status;
1253         char *rcvbuf;
1254         unsigned long flags;
1255         int totleft, numbytes, offset, frame, rc;
1256
1257         /* loop while more completed URBs arrive in the meantime */
1258         for (;;) {
1259                 /* retrieve URB */
1260                 spin_lock_irqsave(&ubc->isoinlock, flags);
1261                 urb = ubc->isoindone;
1262                 if (!urb) {
1263                         spin_unlock_irqrestore(&ubc->isoinlock, flags);
1264                         return;
1265                 }
1266                 status = ubc->isoinstatus;
1267                 ubc->isoindone = NULL;
1268                 if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1269                         dev_warn(cs->dev,
1270                                  "isochronous read overrun, "
1271                                  "dropped URB with status: %s, %d bytes lost\n",
1272                                  get_usb_statmsg(ubc->loststatus),
1273                                  ubc->isoinlost);
1274                         ubc->loststatus = -EINPROGRESS;
1275                 }
1276                 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1277
1278                 if (unlikely(!(ubc->running))) {
1279                         gig_dbg(DEBUG_ISO,
1280                                 "%s: channel not running, "
1281                                 "dropped URB with status: %s",
1282                                 __func__, get_usb_statmsg(status));
1283                         return;
1284                 }
1285
1286                 switch (status) {
1287                 case 0:                         /* normal completion */
1288                         break;
1289                 case -EXDEV:                    /* inspect individual frames
1290                                                    (we do that anyway) */
1291                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1292                                 __func__);
1293                         break;
1294                 case -ENOENT:
1295                 case -ECONNRESET:
1296                 case -EINPROGRESS:
1297                         gig_dbg(DEBUG_ISO, "%s: %s",
1298                                 __func__, get_usb_statmsg(status));
1299                         continue;               /* -> skip */
1300                 case -EPIPE:
1301                         dev_err(cs->dev, "isochronous read stalled\n");
1302                         error_hangup(bcs);
1303                         continue;               /* -> skip */
1304                 default:                        /* severe trouble */
1305                         dev_warn(cs->dev, "isochronous read: %s\n",
1306                                  get_usb_statmsg(status));
1307                         goto error;
1308                 }
1309
1310                 rcvbuf = urb->transfer_buffer;
1311                 totleft = urb->actual_length;
1312                 for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1313                         numbytes = urb->iso_frame_desc[frame].actual_length;
1314                         if (unlikely(urb->iso_frame_desc[frame].status))
1315                                 dev_warn(cs->dev,
1316                                          "isochronous read: frame %d[%d]: %s\n",
1317                                          frame, numbytes,
1318                                          get_usb_statmsg(
1319                                             urb->iso_frame_desc[frame].status));
1320                         if (unlikely(numbytes > BAS_MAXFRAME))
1321                                 dev_warn(cs->dev,
1322                                          "isochronous read: frame %d: "
1323                                          "numbytes (%d) > BAS_MAXFRAME\n",
1324                                          frame, numbytes);
1325                         if (unlikely(numbytes > totleft)) {
1326                                 dev_warn(cs->dev,
1327                                          "isochronous read: frame %d: "
1328                                          "numbytes (%d) > totleft (%d)\n",
1329                                          frame, numbytes, totleft);
1330                                 numbytes = totleft;
1331                         }
1332                         offset = urb->iso_frame_desc[frame].offset;
1333                         if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1334                                 dev_warn(cs->dev,
1335                                          "isochronous read: frame %d: "
1336                                          "offset (%d) + numbytes (%d) "
1337                                          "> BAS_INBUFSIZE\n",
1338                                          frame, offset, numbytes);
1339                                 numbytes = BAS_INBUFSIZE - offset;
1340                         }
1341                         gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1342                         totleft -= numbytes;
1343                 }
1344                 if (unlikely(totleft > 0))
1345                         dev_warn(cs->dev,
1346                                  "isochronous read: %d data bytes missing\n",
1347                                  totleft);
1348
1349 error:
1350                 /* URB processed, resubmit */
1351                 for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1352                         urb->iso_frame_desc[frame].status = 0;
1353                         urb->iso_frame_desc[frame].actual_length = 0;
1354                 }
1355                 /* urb->dev is clobbered by USB subsystem */
1356                 urb->dev = bcs->cs->hw.bas->udev;
1357                 urb->transfer_flags = URB_ISO_ASAP;
1358                 urb->number_of_packets = BAS_NUMFRAMES;
1359                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1360                 if (unlikely(rc != 0 && rc != -ENODEV)) {
1361                         dev_err(cs->dev,
1362                                 "could not resubmit isochronous read URB: %s\n",
1363                                 get_usb_rcmsg(rc));
1364                         dump_urb(DEBUG_ISO, "resubmit iso read", urb);
1365                         error_hangup(bcs);
1366                 }
1367         }
1368 }
1369
1370 /* Channel Operations */
1371 /* ================== */
1372
1373 /* req_timeout
1374  * timeout routine for control output request
1375  * argument:
1376  *      B channel control structure
1377  */
1378 static void req_timeout(unsigned long data)
1379 {
1380         struct bc_state *bcs = (struct bc_state *) data;
1381         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1382         int pending;
1383         unsigned long flags;
1384
1385         check_pending(ucs);
1386
1387         spin_lock_irqsave(&ucs->lock, flags);
1388         pending = ucs->pending;
1389         ucs->pending = 0;
1390         spin_unlock_irqrestore(&ucs->lock, flags);
1391
1392         switch (pending) {
1393         case 0:                                 /* no pending request */
1394                 gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1395                 break;
1396
1397         case HD_OPEN_ATCHANNEL:
1398                 dev_err(bcs->cs->dev, "timeout opening AT channel\n");
1399                 error_reset(bcs->cs);
1400                 break;
1401
1402         case HD_OPEN_B2CHANNEL:
1403         case HD_OPEN_B1CHANNEL:
1404                 dev_err(bcs->cs->dev, "timeout opening channel %d\n",
1405                         bcs->channel + 1);
1406                 error_hangup(bcs);
1407                 break;
1408
1409         case HD_CLOSE_ATCHANNEL:
1410                 dev_err(bcs->cs->dev, "timeout closing AT channel\n");
1411                 error_reset(bcs->cs);
1412                 break;
1413
1414         case HD_CLOSE_B2CHANNEL:
1415         case HD_CLOSE_B1CHANNEL:
1416                 dev_err(bcs->cs->dev, "timeout closing channel %d\n",
1417                         bcs->channel + 1);
1418                 error_reset(bcs->cs);
1419                 break;
1420
1421         case HD_RESET_INTERRUPT_PIPE:
1422                 /* error recovery escalation */
1423                 dev_err(bcs->cs->dev,
1424                         "reset interrupt pipe timeout, attempting USB reset\n");
1425                 usb_queue_reset_device(bcs->cs->hw.bas->interface);
1426                 break;
1427
1428         default:
1429                 dev_warn(bcs->cs->dev, "request 0x%02x timed out, clearing\n",
1430                          pending);
1431         }
1432
1433         wake_up(&ucs->waitqueue);
1434 }
1435
1436 /* write_ctrl_callback
1437  * USB completion handler for control pipe output
1438  * called by the USB subsystem in interrupt context
1439  * parameter:
1440  *      urb     USB request block of completed request
1441  *              urb->context = hardware specific controller state structure
1442  */
1443 static void write_ctrl_callback(struct urb *urb)
1444 {
1445         struct bas_cardstate *ucs = urb->context;
1446         int status = urb->status;
1447         int rc;
1448         unsigned long flags;
1449
1450         /* check status */
1451         switch (status) {
1452         case 0:                                 /* normal completion */
1453                 spin_lock_irqsave(&ucs->lock, flags);
1454                 switch (ucs->pending) {
1455                 case HD_DEVICE_INIT_ACK:        /* no reply expected */
1456                         del_timer(&ucs->timer_ctrl);
1457                         ucs->pending = 0;
1458                         break;
1459                 }
1460                 spin_unlock_irqrestore(&ucs->lock, flags);
1461                 return;
1462
1463         case -ENOENT:                   /* cancelled */
1464         case -ECONNRESET:               /* cancelled (async) */
1465         case -EINPROGRESS:              /* pending */
1466         case -ENODEV:                   /* device removed */
1467         case -ESHUTDOWN:                /* device shut down */
1468                 /* ignore silently */
1469                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1470                         __func__, get_usb_statmsg(status));
1471                 break;
1472
1473         default:                                /* any failure */
1474                 /* don't retry if suspend requested */
1475                 if (++ucs->retry_ctrl > BAS_RETRY ||
1476                     (ucs->basstate & BS_SUSPEND)) {
1477                         dev_err(&ucs->interface->dev,
1478                                 "control request 0x%02x failed: %s\n",
1479                                 ucs->dr_ctrl.bRequest,
1480                                 get_usb_statmsg(status));
1481                         break;          /* give up */
1482                 }
1483                 dev_notice(&ucs->interface->dev,
1484                            "control request 0x%02x: %s, retry %d\n",
1485                            ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
1486                            ucs->retry_ctrl);
1487                 /* urb->dev is clobbered by USB subsystem */
1488                 urb->dev = ucs->udev;
1489                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1490                 if (unlikely(rc)) {
1491                         dev_err(&ucs->interface->dev,
1492                                 "could not resubmit request 0x%02x: %s\n",
1493                                 ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
1494                         break;
1495                 }
1496                 /* resubmitted */
1497                 return;
1498         }
1499
1500         /* failed, clear pending request */
1501         spin_lock_irqsave(&ucs->lock, flags);
1502         del_timer(&ucs->timer_ctrl);
1503         ucs->pending = 0;
1504         spin_unlock_irqrestore(&ucs->lock, flags);
1505         wake_up(&ucs->waitqueue);
1506 }
1507
1508 /* req_submit
1509  * submit a control output request without message buffer to the Gigaset base
1510  * and optionally start a timeout
1511  * parameters:
1512  *      bcs     B channel control structure
1513  *      req     control request code (HD_*)
1514  *      val     control request parameter value (set to 0 if unused)
1515  *      timeout timeout in seconds (0: no timeout)
1516  * return value:
1517  *      0 on success
1518  *      -EBUSY if another request is pending
1519  *      any URB submission error code
1520  */
1521 static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1522 {
1523         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1524         int ret;
1525         unsigned long flags;
1526
1527         gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1528
1529         spin_lock_irqsave(&ucs->lock, flags);
1530         if (ucs->pending) {
1531                 spin_unlock_irqrestore(&ucs->lock, flags);
1532                 dev_err(bcs->cs->dev,
1533                         "submission of request 0x%02x failed: "
1534                         "request 0x%02x still pending\n",
1535                         req, ucs->pending);
1536                 return -EBUSY;
1537         }
1538
1539         ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1540         ucs->dr_ctrl.bRequest = req;
1541         ucs->dr_ctrl.wValue = cpu_to_le16(val);
1542         ucs->dr_ctrl.wIndex = 0;
1543         ucs->dr_ctrl.wLength = 0;
1544         usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1545                              usb_sndctrlpipe(ucs->udev, 0),
1546                              (unsigned char *) &ucs->dr_ctrl, NULL, 0,
1547                              write_ctrl_callback, ucs);
1548         ucs->retry_ctrl = 0;
1549         ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
1550         if (unlikely(ret)) {
1551                 dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1552                         req, get_usb_rcmsg(ret));
1553                 spin_unlock_irqrestore(&ucs->lock, flags);
1554                 return ret;
1555         }
1556         ucs->pending = req;
1557
1558         if (timeout > 0) {
1559                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1560                 ucs->timer_ctrl.expires = jiffies + timeout * HZ / 10;
1561                 ucs->timer_ctrl.data = (unsigned long) bcs;
1562                 ucs->timer_ctrl.function = req_timeout;
1563                 add_timer(&ucs->timer_ctrl);
1564         }
1565
1566         spin_unlock_irqrestore(&ucs->lock, flags);
1567         return 0;
1568 }
1569
1570 /* gigaset_init_bchannel
1571  * called by common.c to connect a B channel
1572  * initialize isochronous I/O and tell the Gigaset base to open the channel
1573  * argument:
1574  *      B channel control structure
1575  * return value:
1576  *      0 on success, error code < 0 on error
1577  */
1578 static int gigaset_init_bchannel(struct bc_state *bcs)
1579 {
1580         struct cardstate *cs = bcs->cs;
1581         int req, ret;
1582         unsigned long flags;
1583
1584         spin_lock_irqsave(&cs->lock, flags);
1585         if (unlikely(!cs->connected)) {
1586                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1587                 spin_unlock_irqrestore(&cs->lock, flags);
1588                 return -ENODEV;
1589         }
1590
1591         if (cs->hw.bas->basstate & BS_SUSPEND) {
1592                 dev_notice(cs->dev,
1593                            "not starting isochronous I/O, "
1594                            "suspend in progress\n");
1595                 spin_unlock_irqrestore(&cs->lock, flags);
1596                 return -EHOSTUNREACH;
1597         }
1598
1599         ret = starturbs(bcs);
1600         if (ret < 0) {
1601                 dev_err(cs->dev,
1602                         "could not start isochronous I/O for channel B%d: %s\n",
1603                         bcs->channel + 1,
1604                         ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
1605                 if (ret != -ENODEV)
1606                         error_hangup(bcs);
1607                 spin_unlock_irqrestore(&cs->lock, flags);
1608                 return ret;
1609         }
1610
1611         req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1612         ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1613         if (ret < 0) {
1614                 dev_err(cs->dev, "could not open channel B%d\n",
1615                         bcs->channel + 1);
1616                 stopurbs(bcs->hw.bas);
1617                 if (ret != -ENODEV)
1618                         error_hangup(bcs);
1619         }
1620
1621         spin_unlock_irqrestore(&cs->lock, flags);
1622         return ret;
1623 }
1624
1625 /* gigaset_close_bchannel
1626  * called by common.c to disconnect a B channel
1627  * tell the Gigaset base to close the channel
1628  * stopping isochronous I/O and LL notification will be done when the
1629  * acknowledgement for the close arrives
1630  * argument:
1631  *      B channel control structure
1632  * return value:
1633  *      0 on success, error code < 0 on error
1634  */
1635 static int gigaset_close_bchannel(struct bc_state *bcs)
1636 {
1637         struct cardstate *cs = bcs->cs;
1638         int req, ret;
1639         unsigned long flags;
1640
1641         spin_lock_irqsave(&cs->lock, flags);
1642         if (unlikely(!cs->connected)) {
1643                 spin_unlock_irqrestore(&cs->lock, flags);
1644                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1645                 return -ENODEV;
1646         }
1647
1648         if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1649                 /* channel not running: just signal common.c */
1650                 spin_unlock_irqrestore(&cs->lock, flags);
1651                 gigaset_bchannel_down(bcs);
1652                 return 0;
1653         }
1654
1655         /* channel running: tell device to close it */
1656         req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1657         ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1658         if (ret < 0)
1659                 dev_err(cs->dev, "closing channel B%d failed\n",
1660                         bcs->channel + 1);
1661
1662         spin_unlock_irqrestore(&cs->lock, flags);
1663         return ret;
1664 }
1665
1666 /* Device Operations */
1667 /* ================= */
1668
1669 /* complete_cb
1670  * unqueue first command buffer from queue, waking any sleepers
1671  * must be called with cs->cmdlock held
1672  * parameter:
1673  *      cs      controller state structure
1674  */
1675 static void complete_cb(struct cardstate *cs)
1676 {
1677         struct cmdbuf_t *cb = cs->cmdbuf;
1678
1679         /* unqueue completed buffer */
1680         cs->cmdbytes -= cs->curlen;
1681         gig_dbg(DEBUG_OUTPUT, "write_command: sent %u bytes, %u left",
1682                 cs->curlen, cs->cmdbytes);
1683         if (cb->next != NULL) {
1684                 cs->cmdbuf = cb->next;
1685                 cs->cmdbuf->prev = NULL;
1686                 cs->curlen = cs->cmdbuf->len;
1687         } else {
1688                 cs->cmdbuf = NULL;
1689                 cs->lastcmdbuf = NULL;
1690                 cs->curlen = 0;
1691         }
1692
1693         if (cb->wake_tasklet)
1694                 tasklet_schedule(cb->wake_tasklet);
1695
1696         kfree(cb);
1697 }
1698
1699 /* write_command_callback
1700  * USB completion handler for AT command transmission
1701  * called by the USB subsystem in interrupt context
1702  * parameter:
1703  *      urb     USB request block of completed request
1704  *              urb->context = controller state structure
1705  */
1706 static void write_command_callback(struct urb *urb)
1707 {
1708         struct cardstate *cs = urb->context;
1709         struct bas_cardstate *ucs = cs->hw.bas;
1710         int status = urb->status;
1711         unsigned long flags;
1712
1713         update_basstate(ucs, 0, BS_ATWRPEND);
1714         wake_up(&ucs->waitqueue);
1715
1716         /* check status */
1717         switch (status) {
1718         case 0:                                 /* normal completion */
1719                 break;
1720         case -ENOENT:                   /* cancelled */
1721         case -ECONNRESET:               /* cancelled (async) */
1722         case -EINPROGRESS:              /* pending */
1723         case -ENODEV:                   /* device removed */
1724         case -ESHUTDOWN:                /* device shut down */
1725                 /* ignore silently */
1726                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1727                         __func__, get_usb_statmsg(status));
1728                 return;
1729         default:                                /* any failure */
1730                 if (++ucs->retry_cmd_out > BAS_RETRY) {
1731                         dev_warn(cs->dev,
1732                                  "command write: %s, "
1733                                  "giving up after %d retries\n",
1734                                  get_usb_statmsg(status),
1735                                  ucs->retry_cmd_out);
1736                         break;
1737                 }
1738                 if (ucs->basstate & BS_SUSPEND) {
1739                         dev_warn(cs->dev,
1740                                  "command write: %s, "
1741                                  "won't retry - suspend requested\n",
1742                                  get_usb_statmsg(status));
1743                         break;
1744                 }
1745                 if (cs->cmdbuf == NULL) {
1746                         dev_warn(cs->dev,
1747                                  "command write: %s, "
1748                                  "cannot retry - cmdbuf gone\n",
1749                                  get_usb_statmsg(status));
1750                         break;
1751                 }
1752                 dev_notice(cs->dev, "command write: %s, retry %d\n",
1753                            get_usb_statmsg(status), ucs->retry_cmd_out);
1754                 if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1755                         /* resubmitted - bypass regular exit block */
1756                         return;
1757                 /* command send failed, assume base still waiting */
1758                 update_basstate(ucs, BS_ATREADY, 0);
1759         }
1760
1761         spin_lock_irqsave(&cs->cmdlock, flags);
1762         if (cs->cmdbuf != NULL)
1763                 complete_cb(cs);
1764         spin_unlock_irqrestore(&cs->cmdlock, flags);
1765 }
1766
1767 /* atrdy_timeout
1768  * timeout routine for AT command transmission
1769  * argument:
1770  *      controller state structure
1771  */
1772 static void atrdy_timeout(unsigned long data)
1773 {
1774         struct cardstate *cs = (struct cardstate *) data;
1775         struct bas_cardstate *ucs = cs->hw.bas;
1776
1777         dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1778
1779         /* fake the missing signal - what else can I do? */
1780         update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1781         start_cbsend(cs);
1782 }
1783
1784 /* atwrite_submit
1785  * submit an HD_WRITE_ATMESSAGE command URB
1786  * parameters:
1787  *      cs      controller state structure
1788  *      buf     buffer containing command to send
1789  *      len     length of command to send
1790  * return value:
1791  *      0 on success
1792  *      -EBUSY if another request is pending
1793  *      any URB submission error code
1794  */
1795 static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1796 {
1797         struct bas_cardstate *ucs = cs->hw.bas;
1798         int rc;
1799
1800         gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1801
1802         if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1803                 dev_err(cs->dev,
1804                         "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1805                 return -EBUSY;
1806         }
1807
1808         ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1809         ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1810         ucs->dr_cmd_out.wValue = 0;
1811         ucs->dr_cmd_out.wIndex = 0;
1812         ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1813         usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1814                              usb_sndctrlpipe(ucs->udev, 0),
1815                              (unsigned char *) &ucs->dr_cmd_out, buf, len,
1816                              write_command_callback, cs);
1817         rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
1818         if (unlikely(rc)) {
1819                 update_basstate(ucs, 0, BS_ATWRPEND);
1820                 dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1821                         get_usb_rcmsg(rc));
1822                 return rc;
1823         }
1824
1825         /* submitted successfully, start timeout if necessary */
1826         if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1827                 gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
1828                         ATRDY_TIMEOUT);
1829                 ucs->timer_atrdy.expires = jiffies + ATRDY_TIMEOUT * HZ / 10;
1830                 ucs->timer_atrdy.data = (unsigned long) cs;
1831                 ucs->timer_atrdy.function = atrdy_timeout;
1832                 add_timer(&ucs->timer_atrdy);
1833         }
1834         return 0;
1835 }
1836
1837 /* start_cbsend
1838  * start transmission of AT command queue if necessary
1839  * parameter:
1840  *      cs              controller state structure
1841  * return value:
1842  *      0 on success
1843  *      error code < 0 on error
1844  */
1845 static int start_cbsend(struct cardstate *cs)
1846 {
1847         struct cmdbuf_t *cb;
1848         struct bas_cardstate *ucs = cs->hw.bas;
1849         unsigned long flags;
1850         int rc;
1851         int retval = 0;
1852
1853         /* check if suspend requested */
1854         if (ucs->basstate & BS_SUSPEND) {
1855                 gig_dbg(DEBUG_OUTPUT, "suspending");
1856                 return -EHOSTUNREACH;
1857         }
1858
1859         /* check if AT channel is open */
1860         if (!(ucs->basstate & BS_ATOPEN)) {
1861                 gig_dbg(DEBUG_OUTPUT, "AT channel not open");
1862                 rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1863                 if (rc < 0) {
1864                         /* flush command queue */
1865                         spin_lock_irqsave(&cs->cmdlock, flags);
1866                         while (cs->cmdbuf != NULL)
1867                                 complete_cb(cs);
1868                         spin_unlock_irqrestore(&cs->cmdlock, flags);
1869                 }
1870                 return rc;
1871         }
1872
1873         /* try to send first command in queue */
1874         spin_lock_irqsave(&cs->cmdlock, flags);
1875
1876         while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
1877                 ucs->retry_cmd_out = 0;
1878                 rc = atwrite_submit(cs, cb->buf, cb->len);
1879                 if (unlikely(rc)) {
1880                         retval = rc;
1881                         complete_cb(cs);
1882                 }
1883         }
1884
1885         spin_unlock_irqrestore(&cs->cmdlock, flags);
1886         return retval;
1887 }
1888
1889 /* gigaset_write_cmd
1890  * This function is called by the device independent part of the driver
1891  * to transmit an AT command string to the Gigaset device.
1892  * It encapsulates the device specific method for transmission over the
1893  * direct USB connection to the base.
1894  * The command string is added to the queue of commands to send, and
1895  * USB transmission is started if necessary.
1896  * parameters:
1897  *      cs              controller state structure
1898  *      cb              command buffer structure
1899  * return value:
1900  *      number of bytes queued on success
1901  *      error code < 0 on error
1902  */
1903 static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb)
1904 {
1905         unsigned long flags;
1906         int rc;
1907
1908         gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
1909                              DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1910                            "CMD Transmit", cb->len, cb->buf);
1911
1912         /* translate "+++" escape sequence sent as a single separate command
1913          * into "close AT channel" command for error recovery
1914          * The next command will reopen the AT channel automatically.
1915          */
1916         if (cb->len == 3 && !memcmp(cb->buf, "+++", 3)) {
1917                 kfree(cb);
1918                 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
1919                 if (cb->wake_tasklet)
1920                         tasklet_schedule(cb->wake_tasklet);
1921                 return rc < 0 ? rc : cb->len;
1922         }
1923
1924         spin_lock_irqsave(&cs->cmdlock, flags);
1925         cb->prev = cs->lastcmdbuf;
1926         if (cs->lastcmdbuf)
1927                 cs->lastcmdbuf->next = cb;
1928         else {
1929                 cs->cmdbuf = cb;
1930                 cs->curlen = cb->len;
1931         }
1932         cs->cmdbytes += cb->len;
1933         cs->lastcmdbuf = cb;
1934         spin_unlock_irqrestore(&cs->cmdlock, flags);
1935
1936         spin_lock_irqsave(&cs->lock, flags);
1937         if (unlikely(!cs->connected)) {
1938                 spin_unlock_irqrestore(&cs->lock, flags);
1939                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1940                 /* flush command queue */
1941                 spin_lock_irqsave(&cs->cmdlock, flags);
1942                 while (cs->cmdbuf != NULL)
1943                         complete_cb(cs);
1944                 spin_unlock_irqrestore(&cs->cmdlock, flags);
1945                 return -ENODEV;
1946         }
1947         rc = start_cbsend(cs);
1948         spin_unlock_irqrestore(&cs->lock, flags);
1949         return rc < 0 ? rc : cb->len;
1950 }
1951
1952 /* gigaset_write_room
1953  * tty_driver.write_room interface routine
1954  * return number of characters the driver will accept to be written via
1955  * gigaset_write_cmd
1956  * parameter:
1957  *      controller state structure
1958  * return value:
1959  *      number of characters
1960  */
1961 static int gigaset_write_room(struct cardstate *cs)
1962 {
1963         return IF_WRITEBUF;
1964 }
1965
1966 /* gigaset_chars_in_buffer
1967  * tty_driver.chars_in_buffer interface routine
1968  * return number of characters waiting to be sent
1969  * parameter:
1970  *      controller state structure
1971  * return value:
1972  *      number of characters
1973  */
1974 static int gigaset_chars_in_buffer(struct cardstate *cs)
1975 {
1976         return cs->cmdbytes;
1977 }
1978
1979 /* gigaset_brkchars
1980  * implementation of ioctl(GIGASET_BRKCHARS)
1981  * parameter:
1982  *      controller state structure
1983  * return value:
1984  *      -EINVAL (unimplemented function)
1985  */
1986 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
1987 {
1988         return -EINVAL;
1989 }
1990
1991
1992 /* Device Initialization/Shutdown */
1993 /* ============================== */
1994
1995 /* Free hardware dependent part of the B channel structure
1996  * parameter:
1997  *      bcs     B channel structure
1998  * return value:
1999  *      !=0 on success
2000  */
2001 static int gigaset_freebcshw(struct bc_state *bcs)
2002 {
2003         struct bas_bc_state *ubc = bcs->hw.bas;
2004         int i;
2005
2006         if (!ubc)
2007                 return 0;
2008
2009         /* kill URBs and tasklets before freeing - better safe than sorry */
2010         ubc->running = 0;
2011         gig_dbg(DEBUG_INIT, "%s: killing iso URBs", __func__);
2012         for (i = 0; i < BAS_OUTURBS; ++i) {
2013                 usb_kill_urb(ubc->isoouturbs[i].urb);
2014                 usb_free_urb(ubc->isoouturbs[i].urb);
2015         }
2016         for (i = 0; i < BAS_INURBS; ++i) {
2017                 usb_kill_urb(ubc->isoinurbs[i]);
2018                 usb_free_urb(ubc->isoinurbs[i]);
2019         }
2020         tasklet_kill(&ubc->sent_tasklet);
2021         tasklet_kill(&ubc->rcvd_tasklet);
2022         kfree(ubc->isooutbuf);
2023         kfree(ubc);
2024         bcs->hw.bas = NULL;
2025         return 1;
2026 }
2027
2028 /* Initialize hardware dependent part of the B channel structure
2029  * parameter:
2030  *      bcs     B channel structure
2031  * return value:
2032  *      !=0 on success
2033  */
2034 static int gigaset_initbcshw(struct bc_state *bcs)
2035 {
2036         int i;
2037         struct bas_bc_state *ubc;
2038
2039         bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
2040         if (!ubc) {
2041                 pr_err("out of memory\n");
2042                 return 0;
2043         }
2044
2045         ubc->running = 0;
2046         atomic_set(&ubc->corrbytes, 0);
2047         spin_lock_init(&ubc->isooutlock);
2048         for (i = 0; i < BAS_OUTURBS; ++i) {
2049                 ubc->isoouturbs[i].urb = NULL;
2050                 ubc->isoouturbs[i].bcs = bcs;
2051         }
2052         ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
2053         ubc->numsub = 0;
2054         ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL);
2055         if (!ubc->isooutbuf) {
2056                 pr_err("out of memory\n");
2057                 kfree(ubc);
2058                 bcs->hw.bas = NULL;
2059                 return 0;
2060         }
2061         tasklet_init(&ubc->sent_tasklet,
2062                      write_iso_tasklet, (unsigned long) bcs);
2063
2064         spin_lock_init(&ubc->isoinlock);
2065         for (i = 0; i < BAS_INURBS; ++i)
2066                 ubc->isoinurbs[i] = NULL;
2067         ubc->isoindone = NULL;
2068         ubc->loststatus = -EINPROGRESS;
2069         ubc->isoinlost = 0;
2070         ubc->seqlen = 0;
2071         ubc->inbyte = 0;
2072         ubc->inbits = 0;
2073         ubc->goodbytes = 0;
2074         ubc->alignerrs = 0;
2075         ubc->fcserrs = 0;
2076         ubc->frameerrs = 0;
2077         ubc->giants = 0;
2078         ubc->runts = 0;
2079         ubc->aborts = 0;
2080         ubc->shared0s = 0;
2081         ubc->stolen0s = 0;
2082         tasklet_init(&ubc->rcvd_tasklet,
2083                      read_iso_tasklet, (unsigned long) bcs);
2084         return 1;
2085 }
2086
2087 static void gigaset_reinitbcshw(struct bc_state *bcs)
2088 {
2089         struct bas_bc_state *ubc = bcs->hw.bas;
2090
2091         bcs->hw.bas->running = 0;
2092         atomic_set(&bcs->hw.bas->corrbytes, 0);
2093         bcs->hw.bas->numsub = 0;
2094         spin_lock_init(&ubc->isooutlock);
2095         spin_lock_init(&ubc->isoinlock);
2096         ubc->loststatus = -EINPROGRESS;
2097 }
2098
2099 static void gigaset_freecshw(struct cardstate *cs)
2100 {
2101         /* timers, URBs and rcvbuf are disposed of in disconnect */
2102         kfree(cs->hw.bas->int_in_buf);
2103         kfree(cs->hw.bas);
2104         cs->hw.bas = NULL;
2105 }
2106
2107 static int gigaset_initcshw(struct cardstate *cs)
2108 {
2109         struct bas_cardstate *ucs;
2110
2111         cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
2112         if (!ucs) {
2113                 pr_err("out of memory\n");
2114                 return 0;
2115         }
2116         ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
2117         if (!ucs->int_in_buf) {
2118                 kfree(ucs);
2119                 pr_err("out of memory\n");
2120                 return 0;
2121         }
2122
2123         ucs->urb_cmd_in = NULL;
2124         ucs->urb_cmd_out = NULL;
2125         ucs->rcvbuf = NULL;
2126         ucs->rcvbuf_size = 0;
2127
2128         spin_lock_init(&ucs->lock);
2129         ucs->pending = 0;
2130
2131         ucs->basstate = 0;
2132         init_timer(&ucs->timer_ctrl);
2133         init_timer(&ucs->timer_atrdy);
2134         init_timer(&ucs->timer_cmd_in);
2135         init_waitqueue_head(&ucs->waitqueue);
2136
2137         return 1;
2138 }
2139
2140 /* freeurbs
2141  * unlink and deallocate all URBs unconditionally
2142  * caller must make sure that no commands are still in progress
2143  * parameter:
2144  *      cs      controller state structure
2145  */
2146 static void freeurbs(struct cardstate *cs)
2147 {
2148         struct bas_cardstate *ucs = cs->hw.bas;
2149         struct bas_bc_state *ubc;
2150         int i, j;
2151
2152         gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
2153         for (j = 0; j < BAS_CHANNELS; ++j) {
2154                 ubc = cs->bcs[j].hw.bas;
2155                 for (i = 0; i < BAS_OUTURBS; ++i) {
2156                         usb_kill_urb(ubc->isoouturbs[i].urb);
2157                         usb_free_urb(ubc->isoouturbs[i].urb);
2158                         ubc->isoouturbs[i].urb = NULL;
2159                 }
2160                 for (i = 0; i < BAS_INURBS; ++i) {
2161                         usb_kill_urb(ubc->isoinurbs[i]);
2162                         usb_free_urb(ubc->isoinurbs[i]);
2163                         ubc->isoinurbs[i] = NULL;
2164                 }
2165         }
2166         usb_kill_urb(ucs->urb_int_in);
2167         usb_free_urb(ucs->urb_int_in);
2168         ucs->urb_int_in = NULL;
2169         usb_kill_urb(ucs->urb_cmd_out);
2170         usb_free_urb(ucs->urb_cmd_out);
2171         ucs->urb_cmd_out = NULL;
2172         usb_kill_urb(ucs->urb_cmd_in);
2173         usb_free_urb(ucs->urb_cmd_in);
2174         ucs->urb_cmd_in = NULL;
2175         usb_kill_urb(ucs->urb_ctrl);
2176         usb_free_urb(ucs->urb_ctrl);
2177         ucs->urb_ctrl = NULL;
2178 }
2179
2180 /* gigaset_probe
2181  * This function is called when a new USB device is connected.
2182  * It checks whether the new device is handled by this driver.
2183  */
2184 static int gigaset_probe(struct usb_interface *interface,
2185                          const struct usb_device_id *id)
2186 {
2187         struct usb_host_interface *hostif;
2188         struct usb_device *udev = interface_to_usbdev(interface);
2189         struct cardstate *cs = NULL;
2190         struct bas_cardstate *ucs = NULL;
2191         struct bas_bc_state *ubc;
2192         struct usb_endpoint_descriptor *endpoint;
2193         int i, j;
2194         int rc;
2195
2196         gig_dbg(DEBUG_INIT,
2197                 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2198                 __func__, le16_to_cpu(udev->descriptor.idVendor),
2199                 le16_to_cpu(udev->descriptor.idProduct));
2200
2201         /* set required alternate setting */
2202         hostif = interface->cur_altsetting;
2203         if (hostif->desc.bAlternateSetting != 3) {
2204                 gig_dbg(DEBUG_INIT,
2205                         "%s: wrong alternate setting %d - trying to switch",
2206                         __func__, hostif->desc.bAlternateSetting);
2207                 if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3)
2208                     < 0) {
2209                         dev_warn(&udev->dev, "usb_set_interface failed, "
2210                                  "device %d interface %d altsetting %d\n",
2211                                  udev->devnum, hostif->desc.bInterfaceNumber,
2212                                  hostif->desc.bAlternateSetting);
2213                         return -ENODEV;
2214                 }
2215                 hostif = interface->cur_altsetting;
2216         }
2217
2218         /* Reject application specific interfaces
2219          */
2220         if (hostif->desc.bInterfaceClass != 255) {
2221                 dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
2222                          __func__, hostif->desc.bInterfaceClass);
2223                 return -ENODEV;
2224         }
2225
2226         dev_info(&udev->dev,
2227                  "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
2228                  __func__, le16_to_cpu(udev->descriptor.idVendor),
2229                  le16_to_cpu(udev->descriptor.idProduct));
2230
2231         /* allocate memory for our device state and intialize it */
2232         cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
2233                             GIGASET_MODULENAME);
2234         if (!cs)
2235                 return -ENODEV;
2236         ucs = cs->hw.bas;
2237
2238         /* save off device structure ptrs for later use */
2239         usb_get_dev(udev);
2240         ucs->udev = udev;
2241         ucs->interface = interface;
2242         cs->dev = &interface->dev;
2243
2244         /* allocate URBs:
2245          * - one for the interrupt pipe
2246          * - three for the different uses of the default control pipe
2247          * - three for each isochronous pipe
2248          */
2249         if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2250             !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2251             !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
2252             !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
2253                 goto allocerr;
2254
2255         for (j = 0; j < BAS_CHANNELS; ++j) {
2256                 ubc = cs->bcs[j].hw.bas;
2257                 for (i = 0; i < BAS_OUTURBS; ++i)
2258                         if (!(ubc->isoouturbs[i].urb =
2259                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2260                                 goto allocerr;
2261                 for (i = 0; i < BAS_INURBS; ++i)
2262                         if (!(ubc->isoinurbs[i] =
2263                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2264                                 goto allocerr;
2265         }
2266
2267         ucs->rcvbuf = NULL;
2268         ucs->rcvbuf_size = 0;
2269
2270         /* Fill the interrupt urb and send it to the core */
2271         endpoint = &hostif->endpoint[0].desc;
2272         usb_fill_int_urb(ucs->urb_int_in, udev,
2273                          usb_rcvintpipe(udev,
2274                                         (endpoint->bEndpointAddress) & 0x0f),
2275                          ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
2276                          endpoint->bInterval);
2277         rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2278         if (rc != 0) {
2279                 dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2280                         get_usb_rcmsg(rc));
2281                 goto error;
2282         }
2283
2284         /* tell the device that the driver is ready */
2285         rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0);
2286         if (rc != 0)
2287                 goto error;
2288
2289         /* tell common part that the device is ready */
2290         if (startmode == SM_LOCKED)
2291                 cs->mstate = MS_LOCKED;
2292
2293         /* save address of controller structure */
2294         usb_set_intfdata(interface, cs);
2295
2296         if (!gigaset_start(cs))
2297                 goto error;
2298
2299         return 0;
2300
2301 allocerr:
2302         dev_err(cs->dev, "could not allocate URBs\n");
2303 error:
2304         freeurbs(cs);
2305         usb_set_intfdata(interface, NULL);
2306         gigaset_freecs(cs);
2307         return -ENODEV;
2308 }
2309
2310 /* gigaset_disconnect
2311  * This function is called when the Gigaset base is unplugged.
2312  */
2313 static void gigaset_disconnect(struct usb_interface *interface)
2314 {
2315         struct cardstate *cs;
2316         struct bas_cardstate *ucs;
2317         int j;
2318
2319         cs = usb_get_intfdata(interface);
2320
2321         ucs = cs->hw.bas;
2322
2323         dev_info(cs->dev, "disconnecting Gigaset base\n");
2324
2325         /* mark base as not ready, all channels disconnected */
2326         ucs->basstate = 0;
2327
2328         /* tell LL all channels are down */
2329         for (j = 0; j < BAS_CHANNELS; ++j)
2330                 gigaset_bchannel_down(cs->bcs + j);
2331
2332         /* stop driver (common part) */
2333         gigaset_stop(cs);
2334
2335         /* stop timers and URBs, free ressources */
2336         del_timer_sync(&ucs->timer_ctrl);
2337         del_timer_sync(&ucs->timer_atrdy);
2338         del_timer_sync(&ucs->timer_cmd_in);
2339         freeurbs(cs);
2340         usb_set_intfdata(interface, NULL);
2341         kfree(ucs->rcvbuf);
2342         ucs->rcvbuf = NULL;
2343         ucs->rcvbuf_size = 0;
2344         usb_put_dev(ucs->udev);
2345         ucs->interface = NULL;
2346         ucs->udev = NULL;
2347         cs->dev = NULL;
2348         gigaset_freecs(cs);
2349 }
2350
2351 /* gigaset_suspend
2352  * This function is called before the USB connection is suspended.
2353  */
2354 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
2355 {
2356         struct cardstate *cs = usb_get_intfdata(intf);
2357         struct bas_cardstate *ucs = cs->hw.bas;
2358         int rc;
2359
2360         /* set suspend flag; this stops AT command/response traffic */
2361         if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
2362                 gig_dbg(DEBUG_SUSPEND, "already suspended");
2363                 return 0;
2364         }
2365
2366         /* wait a bit for blocking conditions to go away */
2367         rc = wait_event_timeout(ucs->waitqueue,
2368                         !(ucs->basstate &
2369                           (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)),
2370                         BAS_TIMEOUT*HZ/10);
2371         gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
2372
2373         /* check for conditions preventing suspend */
2374         if (ucs->basstate & (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)) {
2375                 dev_warn(cs->dev, "cannot suspend:\n");
2376                 if (ucs->basstate & BS_B1OPEN)
2377                         dev_warn(cs->dev, " B channel 1 open\n");
2378                 if (ucs->basstate & BS_B2OPEN)
2379                         dev_warn(cs->dev, " B channel 2 open\n");
2380                 if (ucs->basstate & BS_ATRDPEND)
2381                         dev_warn(cs->dev, " receiving AT reply\n");
2382                 if (ucs->basstate & BS_ATWRPEND)
2383                         dev_warn(cs->dev, " sending AT command\n");
2384                 update_basstate(ucs, 0, BS_SUSPEND);
2385                 return -EBUSY;
2386         }
2387
2388         /* close AT channel if open */
2389         if (ucs->basstate & BS_ATOPEN) {
2390                 gig_dbg(DEBUG_SUSPEND, "closing AT channel");
2391                 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
2392                 if (rc) {
2393                         update_basstate(ucs, 0, BS_SUSPEND);
2394                         return rc;
2395                 }
2396                 wait_event_timeout(ucs->waitqueue, !ucs->pending,
2397                                    BAS_TIMEOUT*HZ/10);
2398                 /* in case of timeout, proceed anyway */
2399         }
2400
2401         /* kill all URBs and timers that might still be pending */
2402         usb_kill_urb(ucs->urb_ctrl);
2403         usb_kill_urb(ucs->urb_int_in);
2404         del_timer_sync(&ucs->timer_ctrl);
2405
2406         gig_dbg(DEBUG_SUSPEND, "suspend complete");
2407         return 0;
2408 }
2409
2410 /* gigaset_resume
2411  * This function is called after the USB connection has been resumed.
2412  */
2413 static int gigaset_resume(struct usb_interface *intf)
2414 {
2415         struct cardstate *cs = usb_get_intfdata(intf);
2416         struct bas_cardstate *ucs = cs->hw.bas;
2417         int rc;
2418
2419         /* resubmit interrupt URB for spontaneous messages from base */
2420         rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2421         if (rc) {
2422                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
2423                         get_usb_rcmsg(rc));
2424                 return rc;
2425         }
2426
2427         /* clear suspend flag to reallow activity */
2428         update_basstate(ucs, 0, BS_SUSPEND);
2429
2430         gig_dbg(DEBUG_SUSPEND, "resume complete");
2431         return 0;
2432 }
2433
2434 /* gigaset_pre_reset
2435  * This function is called before the USB connection is reset.
2436  */
2437 static int gigaset_pre_reset(struct usb_interface *intf)
2438 {
2439         /* handle just like suspend */
2440         return gigaset_suspend(intf, PMSG_ON);
2441 }
2442
2443 /* gigaset_post_reset
2444  * This function is called after the USB connection has been reset.
2445  */
2446 static int gigaset_post_reset(struct usb_interface *intf)
2447 {
2448         /* FIXME: send HD_DEVICE_INIT_ACK? */
2449
2450         /* resume operations */
2451         return gigaset_resume(intf);
2452 }
2453
2454
2455 static const struct gigaset_ops gigops = {
2456         gigaset_write_cmd,
2457         gigaset_write_room,
2458         gigaset_chars_in_buffer,
2459         gigaset_brkchars,
2460         gigaset_init_bchannel,
2461         gigaset_close_bchannel,
2462         gigaset_initbcshw,
2463         gigaset_freebcshw,
2464         gigaset_reinitbcshw,
2465         gigaset_initcshw,
2466         gigaset_freecshw,
2467         gigaset_set_modem_ctrl,
2468         gigaset_baud_rate,
2469         gigaset_set_line_ctrl,
2470         gigaset_isoc_send_skb,
2471         gigaset_isoc_input,
2472 };
2473
2474 /* bas_gigaset_init
2475  * This function is called after the kernel module is loaded.
2476  */
2477 static int __init bas_gigaset_init(void)
2478 {
2479         int result;
2480
2481         /* allocate memory for our driver state and intialize it */
2482         driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2483                                     GIGASET_MODULENAME, GIGASET_DEVNAME,
2484                                     &gigops, THIS_MODULE);
2485         if (driver == NULL)
2486                 goto error;
2487
2488         /* register this driver with the USB subsystem */
2489         result = usb_register(&gigaset_usb_driver);
2490         if (result < 0) {
2491                 pr_err("error %d registering USB driver\n", -result);
2492                 goto error;
2493         }
2494
2495         pr_info(DRIVER_DESC "\n");
2496         return 0;
2497
2498 error:
2499         if (driver)
2500                 gigaset_freedriver(driver);
2501         driver = NULL;
2502         return -1;
2503 }
2504
2505 /* bas_gigaset_exit
2506  * This function is called before the kernel module is unloaded.
2507  */
2508 static void __exit bas_gigaset_exit(void)
2509 {
2510         struct bas_cardstate *ucs;
2511         int i;
2512
2513         gigaset_blockdriver(driver); /* => probe will fail
2514                                       * => no gigaset_start any more
2515                                       */
2516
2517         /* stop all connected devices */
2518         for (i = 0; i < driver->minors; i++) {
2519                 if (gigaset_shutdown(driver->cs + i) < 0)
2520                         continue;               /* no device */
2521                 /* from now on, no isdn callback should be possible */
2522
2523                 /* close all still open channels */
2524                 ucs = driver->cs[i].hw.bas;
2525                 if (ucs->basstate & BS_B1OPEN) {
2526                         gig_dbg(DEBUG_INIT, "closing B1 channel");
2527                         usb_control_msg(ucs->udev,
2528                                         usb_sndctrlpipe(ucs->udev, 0),
2529                                         HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
2530                                         0, 0, NULL, 0, BAS_TIMEOUT);
2531                 }
2532                 if (ucs->basstate & BS_B2OPEN) {
2533                         gig_dbg(DEBUG_INIT, "closing B2 channel");
2534                         usb_control_msg(ucs->udev,
2535                                         usb_sndctrlpipe(ucs->udev, 0),
2536                                         HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
2537                                         0, 0, NULL, 0, BAS_TIMEOUT);
2538                 }
2539                 if (ucs->basstate & BS_ATOPEN) {
2540                         gig_dbg(DEBUG_INIT, "closing AT channel");
2541                         usb_control_msg(ucs->udev,
2542                                         usb_sndctrlpipe(ucs->udev, 0),
2543                                         HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
2544                                         0, 0, NULL, 0, BAS_TIMEOUT);
2545                 }
2546                 ucs->basstate = 0;
2547         }
2548
2549         /* deregister this driver with the USB subsystem */
2550         usb_deregister(&gigaset_usb_driver);
2551         /* this will call the disconnect-callback */
2552         /* from now on, no disconnect/probe callback should be running */
2553
2554         gigaset_freedriver(driver);
2555         driver = NULL;
2556 }
2557
2558
2559 module_init(bas_gigaset_init);
2560 module_exit(bas_gigaset_exit);
2561
2562 MODULE_AUTHOR(DRIVER_AUTHOR);
2563 MODULE_DESCRIPTION(DRIVER_DESC);
2564 MODULE_LICENSE("GPL");