drivers/isdn/gigaset/bas-gigaset.c

   1 /*
   2  * USB driver for Gigaset 307x base via direct USB connection.
   3  *
   4  * Copyright (c) 2001 by Hansjoerg Lipp <hjlipp@web.de>,
   5  *                       Tilman Schmidt <tilman@imap.cc>,
   6  *                       Stefan Eilers.
   7  *
   8  * =====================================================================
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License as
  11  *      published by the Free Software Foundation; either version 2 of
  12  *      the License, or (at your option) any later version.
  13  * =====================================================================
  14  */
  15
  16 #include "gigaset.h"
  17
  18 #include <linux/errno.h>
  19 #include <linux/init.h>
  20 #include <linux/slab.h>
  21 #include <linux/timer.h>
  22 #include <linux/usb.h>
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25
  26 /* Version Information */
  27 #define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
  28 #define DRIVER_DESC "USB Driver for Gigaset 307x"
  29
  30
  31 /* Module parameters */
  32
  33 static int startmode = SM_ISDN;
  34 static int cidmode = 1;
  35
  36 module_param(startmode, int, S_IRUGO);
  37 module_param(cidmode, int, S_IRUGO);
  38 MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
  39 MODULE_PARM_DESC(cidmode, "Call-ID mode");
  40
  41 #define GIGASET_MINORS     1
  42 #define GIGASET_MINOR      16
  43 #define GIGASET_MODULENAME "bas_gigaset"
  44 #define GIGASET_DEVNAME    "ttyGB"
  45
  46 /* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
  47 #define IF_WRITEBUF 264
  48
  49 /* interrupt pipe message size according to ibid. ch. 2.2 */
  50 #define IP_MSGSIZE 3
  51
  52 /* Values for the Gigaset 307x */
  53 #define USB_GIGA_VENDOR_ID      0x0681
  54 #define USB_3070_PRODUCT_ID     0x0001
  55 #define USB_3075_PRODUCT_ID     0x0002
  56 #define USB_SX303_PRODUCT_ID    0x0021
  57 #define USB_SX353_PRODUCT_ID    0x0022
  58
  59 /* table of devices that work with this driver */
  60 static const struct usb_device_id gigaset_table [] = {
  61         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3070_PRODUCT_ID) },
  62         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3075_PRODUCT_ID) },
  63         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX303_PRODUCT_ID) },
  64         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX353_PRODUCT_ID) },
  65         { } /* Terminating entry */
  66 };
  67
  68 MODULE_DEVICE_TABLE(usb, gigaset_table);
  69
  70 /*======================= local function prototypes ==========================*/
  71
  72 /* function called if a new device belonging to this driver is connected */
  73 static int gigaset_probe(struct usb_interface *interface,
  74                          const struct usb_device_id *id);
  75
  76 /* Function will be called if the device is unplugged */
  77 static void gigaset_disconnect(struct usb_interface *interface);
  78
  79 /* functions called before/after suspend */
  80 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
  81 static int gigaset_resume(struct usb_interface *intf);
  82
  83 /* functions called before/after device reset */
  84 static int gigaset_pre_reset(struct usb_interface *intf);
  85 static int gigaset_post_reset(struct usb_interface *intf);
  86
  87 static int atread_submit(struct cardstate *, int);
  88 static void stopurbs(struct bas_bc_state *);
  89 static int req_submit(struct bc_state *, int, int, int);
  90 static int atwrite_submit(struct cardstate *, unsigned char *, int);
  91 static int start_cbsend(struct cardstate *);
  92
  93 /*============================================================================*/
  94
  95 struct bas_cardstate {
  96         struct usb_device       *udev;          /* USB device pointer */
  97         struct usb_interface    *interface;     /* interface for this device */
  98         unsigned char           minor;          /* starting minor number */
  99
 100         struct urb              *urb_ctrl;      /* control pipe default URB */
 101         struct usb_ctrlrequest  dr_ctrl;
 102         struct timer_list       timer_ctrl;     /* control request timeout */
 103         int                     retry_ctrl;
 104
 105         struct timer_list       timer_atrdy;    /* AT command ready timeout */
 106         struct urb              *urb_cmd_out;   /* for sending AT commands */
 107         struct usb_ctrlrequest  dr_cmd_out;
 108         int                     retry_cmd_out;
 109
 110         struct urb              *urb_cmd_in;    /* for receiving AT replies */
 111         struct usb_ctrlrequest  dr_cmd_in;
 112         struct timer_list       timer_cmd_in;   /* receive request timeout */
 113         unsigned char           *rcvbuf;        /* AT reply receive buffer */
 114
 115         struct urb              *urb_int_in;    /* URB for interrupt pipe */
 116         unsigned char           *int_in_buf;
 117
 118         spinlock_t              lock;           /* locks all following */
 119         int                     basstate;       /* bitmap (BS_*) */
 120         int                     pending;        /* uncompleted base request */
 121         wait_queue_head_t       waitqueue;
 122         int                     rcvbuf_size;    /* size of AT receive buffer */
 123                                                 /* 0: no receive in progress */
 124         int                     retry_cmd_in;   /* receive req retry count */
 125 };
 126
 127 /* status of direct USB connection to 307x base (bits in basstate) */
 128 #define BS_ATOPEN       0x001   /* AT channel open */
 129 #define BS_B1OPEN       0x002   /* B channel 1 open */
 130 #define BS_B2OPEN       0x004   /* B channel 2 open */
 131 #define BS_ATREADY      0x008   /* base ready for AT command */
 132 #define BS_INIT         0x010   /* base has signalled INIT_OK */
 133 #define BS_ATTIMER      0x020   /* waiting for HD_READY_SEND_ATDATA */
 134 #define BS_ATRDPEND     0x040   /* urb_cmd_in in use */
 135 #define BS_ATWRPEND     0x080   /* urb_cmd_out in use */
 136 #define BS_SUSPEND      0x100   /* USB port suspended */
 137 #define BS_RESETTING    0x200   /* waiting for HD_RESET_INTERRUPT_PIPE_ACK */
 138
 139
 140 static struct gigaset_driver *driver = NULL;
 141
 142 /* usb specific object needed to register this driver with the usb subsystem */
 143 static struct usb_driver gigaset_usb_driver = {
 144         .name =         GIGASET_MODULENAME,
 145         .probe =        gigaset_probe,
 146         .disconnect =   gigaset_disconnect,
 147         .id_table =     gigaset_table,
 148         .suspend =      gigaset_suspend,
 149         .resume =       gigaset_resume,
 150         .reset_resume = gigaset_post_reset,
 151         .pre_reset =    gigaset_pre_reset,
 152         .post_reset =   gigaset_post_reset,
 153 };
 154
 155 /* get message text for usb_submit_urb return code
 156  */
 157 static char *get_usb_rcmsg(int rc)
 158 {
 159         static char unkmsg[28];
 160
 161         switch (rc) {
 162         case 0:
 163                 return "success";
 164         case -ENOMEM:
 165                 return "out of memory";
 166         case -ENODEV:
 167                 return "device not present";
 168         case -ENOENT:
 169                 return "endpoint not present";
 170         case -ENXIO:
 171                 return "URB type not supported";
 172         case -EINVAL:
 173                 return "invalid argument";
 174         case -EAGAIN:
 175                 return "start frame too early or too much scheduled";
 176         case -EFBIG:
 177                 return "too many isochronous frames requested";
 178         case -EPIPE:
 179                 return "endpoint stalled";
 180         case -EMSGSIZE:
 181                 return "invalid packet size";
 182         case -ENOSPC:
 183                 return "would overcommit USB bandwidth";
 184         case -ESHUTDOWN:
 185                 return "device shut down";
 186         case -EPERM:
 187                 return "reject flag set";
 188         case -EHOSTUNREACH:
 189                 return "device suspended";
 190         default:
 191                 snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
 192                 return unkmsg;
 193         }
 194 }
 195
 196 /* get message text for USB status code
 197  */
 198 static char *get_usb_statmsg(int status)
 199 {
 200         static char unkmsg[28];
 201
 202         switch (status) {
 203         case 0:
 204                 return "success";
 205         case -ENOENT:
 206                 return "unlinked (sync)";
 207         case -EINPROGRESS:
 208                 return "pending";
 209         case -EPROTO:
 210                 return "bit stuffing error, timeout, or unknown USB error";
 211         case -EILSEQ:
 212                 return "CRC mismatch, timeout, or unknown USB error";
 213         case -ETIME:
 214                 return "timed out";
 215         case -EPIPE:
 216                 return "endpoint stalled";
 217         case -ECOMM:
 218                 return "IN buffer overrun";
 219         case -ENOSR:
 220                 return "OUT buffer underrun";
 221         case -EOVERFLOW:
 222                 return "too much data";
 223         case -EREMOTEIO:
 224                 return "short packet detected";
 225         case -ENODEV:
 226                 return "device removed";
 227         case -EXDEV:
 228                 return "partial isochronous transfer";
 229         case -EINVAL:
 230                 return "invalid argument";
 231         case -ECONNRESET:
 232                 return "unlinked (async)";
 233         case -ESHUTDOWN:
 234                 return "device shut down";
 235         default:
 236                 snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
 237                 return unkmsg;
 238         }
 239 }
 240
 241 /* usb_pipetype_str
 242  * retrieve string representation of USB pipe type
 243  */
 244 static inline char *usb_pipetype_str(int pipe)
 245 {
 246         if (usb_pipeisoc(pipe))
 247                 return "Isoc";
 248         if (usb_pipeint(pipe))
 249                 return "Int";
 250         if (usb_pipecontrol(pipe))
 251                 return "Ctrl";
 252         if (usb_pipebulk(pipe))
 253                 return "Bulk";
 254         return "?";
 255 }
 256
 257 /* dump_urb
 258  * write content of URB to syslog for debugging
 259  */
 260 static inline void dump_urb(enum debuglevel level, const char *tag,
 261                             struct urb *urb)
 262 {
 263 #ifdef CONFIG_GIGASET_DEBUG
 264         int i;
 265         gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
 266         if (urb) {
 267                 gig_dbg(level,
 268                         "  dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
 269                         "hcpriv=0x%08lx, transfer_flags=0x%x,",
 270                         (unsigned long) urb->dev,
 271                         usb_pipetype_str(urb->pipe),
 272                         usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
 273                         usb_pipein(urb->pipe) ? "in" : "out",
 274                         (unsigned long) urb->hcpriv,
 275                         urb->transfer_flags);
 276                 gig_dbg(level,
 277                         "  transfer_buffer=0x%08lx[%d], actual_length=%d, "
 278                         "setup_packet=0x%08lx,",
 279                         (unsigned long) urb->transfer_buffer,
 280                         urb->transfer_buffer_length, urb->actual_length,
 281                         (unsigned long) urb->setup_packet);
 282                 gig_dbg(level,
 283                         "  start_frame=%d, number_of_packets=%d, interval=%d, "
 284                         "error_count=%d,",
 285                         urb->start_frame, urb->number_of_packets, urb->interval,
 286                         urb->error_count);
 287                 gig_dbg(level,
 288                         "  context=0x%08lx, complete=0x%08lx, "
 289                         "iso_frame_desc[]={",
 290                         (unsigned long) urb->context,
 291                         (unsigned long) urb->complete);
 292                 for (i = 0; i < urb->number_of_packets; i++) {
 293                         struct usb_iso_packet_descriptor *pifd
 294                                 = &urb->iso_frame_desc[i];
 295                         gig_dbg(level,
 296                                 "    {offset=%u, length=%u, actual_length=%u, "
 297                                 "status=%u}",
 298                                 pifd->offset, pifd->length, pifd->actual_length,
 299                                 pifd->status);
 300                 }
 301         }
 302         gig_dbg(level, "}}");
 303 #endif
 304 }
 305
 306 /* read/set modem control bits etc. (m10x only) */
 307 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
 308                                   unsigned new_state)
 309 {
 310         return -EINVAL;
 311 }
 312
 313 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
 314 {
 315         return -EINVAL;
 316 }
 317
 318 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
 319 {
 320         return -EINVAL;
 321 }
 322
 323 /* set/clear bits in base connection state, return previous state
 324  */
 325 static inline int update_basstate(struct bas_cardstate *ucs,
 326                                   int set, int clear)
 327 {
 328         unsigned long flags;
 329         int state;
 330
 331         spin_lock_irqsave(&ucs->lock, flags);
 332         state = ucs->basstate;
 333         ucs->basstate = (state & ~clear) | set;
 334         spin_unlock_irqrestore(&ucs->lock, flags);
 335         return state;
 336 }
 337
 338 /* error_hangup
 339  * hang up any existing connection because of an unrecoverable error
 340  * This function may be called from any context and takes care of scheduling
 341  * the necessary actions for execution outside of interrupt context.
 342  * cs->lock must not be held.
 343  * argument:
 344  *      B channel control structure
 345  */
 346 static inline void error_hangup(struct bc_state *bcs)
 347 {
 348         struct cardstate *cs = bcs->cs;
 349
 350         gig_dbg(DEBUG_ANY, "%s: scheduling HUP for channel %d",
 351                 __func__, bcs->channel);
 352
 353         if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL))
 354                 dev_err(cs->dev, "event queue full\n");
 355
 356         gigaset_schedule_event(cs);
 357 }
 358
 359 /* error_reset
 360  * reset Gigaset device because of an unrecoverable error
 361  * This function may be called from any context, and takes care of
 362  * scheduling the necessary actions for execution outside of interrupt context.
 363  * cs->lock must not be held.
 364  * argument:
 365  *      controller state structure
 366  */
 367 static inline void error_reset(struct cardstate *cs)
 368 {
 369         /* reset interrupt pipe to recover (ignore errors) */
 370         update_basstate(cs->hw.bas, BS_RESETTING, 0);
 371         req_submit(cs->bcs, HD_RESET_INTERRUPT_PIPE, 0, BAS_TIMEOUT);
 372 }
 373
 374 /* check_pending
 375  * check for completion of pending control request
 376  * parameter:
 377  *      ucs     hardware specific controller state structure
 378  */
 379 static void check_pending(struct bas_cardstate *ucs)
 380 {
 381         unsigned long flags;
 382
 383         spin_lock_irqsave(&ucs->lock, flags);
 384         switch (ucs->pending) {
 385         case 0:
 386                 break;
 387         case HD_OPEN_ATCHANNEL:
 388                 if (ucs->basstate & BS_ATOPEN)
 389                         ucs->pending = 0;
 390                 break;
 391         case HD_OPEN_B1CHANNEL:
 392                 if (ucs->basstate & BS_B1OPEN)
 393                         ucs->pending = 0;
 394                 break;
 395         case HD_OPEN_B2CHANNEL:
 396                 if (ucs->basstate & BS_B2OPEN)
 397                         ucs->pending = 0;
 398                 break;
 399         case HD_CLOSE_ATCHANNEL:
 400                 if (!(ucs->basstate & BS_ATOPEN))
 401                         ucs->pending = 0;
 402                 break;
 403         case HD_CLOSE_B1CHANNEL:
 404                 if (!(ucs->basstate & BS_B1OPEN))
 405                         ucs->pending = 0;
 406                 break;
 407         case HD_CLOSE_B2CHANNEL:
 408                 if (!(ucs->basstate & BS_B2OPEN))
 409                         ucs->pending = 0;
 410                 break;
 411         case HD_DEVICE_INIT_ACK:                /* no reply expected */
 412                 ucs->pending = 0;
 413                 break;
 414         case HD_RESET_INTERRUPT_PIPE:
 415                 if (!(ucs->basstate & BS_RESETTING))
 416                         ucs->pending = 0;
 417                 break;
 418         /*
 419          * HD_READ_ATMESSAGE and HD_WRITE_ATMESSAGE are handled separately
 420          * and should never end up here
 421          */
 422         default:
 423                 dev_warn(&ucs->interface->dev,
 424                          "unknown pending request 0x%02x cleared\n",
 425                          ucs->pending);
 426                 ucs->pending = 0;
 427         }
 428
 429         if (!ucs->pending)
 430                 del_timer(&ucs->timer_ctrl);
 431
 432         spin_unlock_irqrestore(&ucs->lock, flags);
 433 }
 434
 435 /* cmd_in_timeout
 436  * timeout routine for command input request
 437  * argument:
 438  *      controller state structure
 439  */
 440 static void cmd_in_timeout(unsigned long data)
 441 {
 442         struct cardstate *cs = (struct cardstate *) data;
 443         struct bas_cardstate *ucs = cs->hw.bas;
 444         int rc;
 445
 446         if (!ucs->rcvbuf_size) {
 447                 gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
 448                 return;
 449         }
 450
 451         if (ucs->retry_cmd_in++ < BAS_RETRY) {
 452                 dev_notice(cs->dev, "control read: timeout, retry %d\n",
 453                            ucs->retry_cmd_in);
 454                 rc = atread_submit(cs, BAS_TIMEOUT);
 455                 if (rc >= 0 || rc == -ENODEV)
 456                         /* resubmitted or disconnected */
 457                         /* - bypass regular exit block */
 458                         return;
 459         } else {
 460                 dev_err(cs->dev,
 461                         "control read: timeout, giving up after %d tries\n",
 462                         ucs->retry_cmd_in);
 463         }
 464         kfree(ucs->rcvbuf);
 465         ucs->rcvbuf = NULL;
 466         ucs->rcvbuf_size = 0;
 467         error_reset(cs);
 468 }
 469
 470 /* read_ctrl_callback
 471  * USB completion handler for control pipe input
 472  * called by the USB subsystem in interrupt context
 473  * parameter:
 474  *      urb     USB request block
 475  *              urb->context = inbuf structure for controller state
 476  */
 477 static void read_ctrl_callback(struct urb *urb)
 478 {
 479         struct inbuf_t *inbuf = urb->context;
 480         struct cardstate *cs = inbuf->cs;
 481         struct bas_cardstate *ucs = cs->hw.bas;
 482         int status = urb->status;
 483         int have_data = 0;
 484         unsigned numbytes;
 485         int rc;
 486
 487         update_basstate(ucs, 0, BS_ATRDPEND);
 488         wake_up(&ucs->waitqueue);
 489
 490         if (!ucs->rcvbuf_size) {
 491                 dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
 492                 return;
 493         }
 494
 495         del_timer(&ucs->timer_cmd_in);
 496
 497         switch (status) {
 498         case 0:                         /* normal completion */
 499                 numbytes = urb->actual_length;
 500                 if (unlikely(numbytes != ucs->rcvbuf_size)) {
 501                         dev_warn(cs->dev,
 502                                "control read: received %d chars, expected %d\n",
 503                                  numbytes, ucs->rcvbuf_size);
 504                         if (numbytes > ucs->rcvbuf_size)
 505                                 numbytes = ucs->rcvbuf_size;
 506                 }
 507
 508                 /* copy received bytes to inbuf */
 509                 have_data = gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes);
 510
 511                 if (unlikely(numbytes < ucs->rcvbuf_size)) {
 512                         /* incomplete - resubmit for remaining bytes */
 513                         ucs->rcvbuf_size -= numbytes;
 514                         ucs->retry_cmd_in = 0;
 515                         rc = atread_submit(cs, BAS_TIMEOUT);
 516                         if (rc >= 0 || rc == -ENODEV)
 517                                 /* resubmitted or disconnected */
 518                                 /* - bypass regular exit block */
 519                                 return;
 520                         error_reset(cs);
 521                 }
 522                 break;
 523
 524         case -ENOENT:                   /* cancelled */
 525         case -ECONNRESET:               /* cancelled (async) */
 526         case -EINPROGRESS:              /* pending */
 527         case -ENODEV:                   /* device removed */
 528         case -ESHUTDOWN:                /* device shut down */
 529                 /* no action necessary */
 530                 gig_dbg(DEBUG_USBREQ, "%s: %s",
 531                         __func__, get_usb_statmsg(status));
 532                 break;
 533
 534         default:                        /* severe trouble */
 535                 dev_warn(cs->dev, "control read: %s\n",
 536                          get_usb_statmsg(status));
 537                 if (ucs->retry_cmd_in++ < BAS_RETRY) {
 538                         dev_notice(cs->dev, "control read: retry %d\n",
 539                                    ucs->retry_cmd_in);
 540                         rc = atread_submit(cs, BAS_TIMEOUT);
 541                         if (rc >= 0 || rc == -ENODEV)
 542                                 /* resubmitted or disconnected */
 543                                 /* - bypass regular exit block */
 544                                 return;
 545                 } else {
 546                         dev_err(cs->dev,
 547                                 "control read: giving up after %d tries\n",
 548                                 ucs->retry_cmd_in);
 549                 }
 550                 error_reset(cs);
 551         }
 552
 553         kfree(ucs->rcvbuf);
 554         ucs->rcvbuf = NULL;
 555         ucs->rcvbuf_size = 0;
 556         if (have_data) {
 557                 gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
 558                 gigaset_schedule_event(cs);
 559         }
 560 }
 561
 562 /* atread_submit
 563  * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
 564  * parameters:
 565  *      cs      controller state structure
 566  *      timeout timeout in 1/10 sec., 0: none
 567  * return value:
 568  *      0 on success
 569  *      -EBUSY if another request is pending
 570  *      any URB submission error code
 571  */
 572 static int atread_submit(struct cardstate *cs, int timeout)
 573 {
 574         struct bas_cardstate *ucs = cs->hw.bas;
 575         int basstate;
 576         int ret;
 577
 578         gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
 579                 ucs->rcvbuf_size);
 580
 581         basstate = update_basstate(ucs, BS_ATRDPEND, 0);
 582         if (basstate & BS_ATRDPEND) {
 583                 dev_err(cs->dev,
 584                         "could not submit HD_READ_ATMESSAGE: URB busy\n");
 585                 return -EBUSY;
 586         }
 587
 588         if (basstate & BS_SUSPEND) {
 589                 dev_notice(cs->dev,
 590                            "HD_READ_ATMESSAGE not submitted, "
 591                            "suspend in progress\n");
 592                 update_basstate(ucs, 0, BS_ATRDPEND);
 593                 /* treat like disconnect */
 594                 return -ENODEV;
 595         }
 596
 597         ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
 598         ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
 599         ucs->dr_cmd_in.wValue = 0;
 600         ucs->dr_cmd_in.wIndex = 0;
 601         ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
 602         usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
 603                              usb_rcvctrlpipe(ucs->udev, 0),
 604                              (unsigned char*) & ucs->dr_cmd_in,
 605                              ucs->rcvbuf, ucs->rcvbuf_size,
 606                              read_ctrl_callback, cs->inbuf);
 607
 608         if ((ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC)) != 0) {
 609                 update_basstate(ucs, 0, BS_ATRDPEND);
 610                 dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
 611                         get_usb_rcmsg(ret));
 612                 return ret;
 613         }
 614
 615         if (timeout > 0) {
 616                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
 617                 ucs->timer_cmd_in.expires = jiffies + timeout * HZ / 10;
 618                 ucs->timer_cmd_in.data = (unsigned long) cs;
 619                 ucs->timer_cmd_in.function = cmd_in_timeout;
 620                 add_timer(&ucs->timer_cmd_in);
 621         }
 622         return 0;
 623 }
 624
 625 /* read_int_callback
 626  * USB completion handler for interrupt pipe input
 627  * called by the USB subsystem in interrupt context
 628  * parameter:
 629  *      urb     USB request block
 630  *              urb->context = controller state structure
 631  */
 632 static void read_int_callback(struct urb *urb)
 633 {
 634         struct cardstate *cs = urb->context;
 635         struct bas_cardstate *ucs = cs->hw.bas;
 636         struct bc_state *bcs;
 637         int status = urb->status;
 638         unsigned long flags;
 639         int rc;
 640         unsigned l;
 641         int channel;
 642
 643         switch (status) {
 644         case 0:                 /* success */
 645                 break;
 646         case -ENOENT:                   /* cancelled */
 647         case -ECONNRESET:               /* cancelled (async) */
 648         case -EINPROGRESS:              /* pending */
 649                 /* ignore silently */
 650                 gig_dbg(DEBUG_USBREQ, "%s: %s",
 651                         __func__, get_usb_statmsg(status));
 652                 return;
 653         case -ENODEV:                   /* device removed */
 654         case -ESHUTDOWN:                /* device shut down */
 655                 //FIXME use this as disconnect indicator?
 656                 gig_dbg(DEBUG_USBREQ, "%s: device disconnected", __func__);
 657                 return;
 658         default:                /* severe trouble */
 659                 dev_warn(cs->dev, "interrupt read: %s\n",
 660                          get_usb_statmsg(status));
 661                 //FIXME corrective action? resubmission always ok?
 662                 goto resubmit;
 663         }
 664
 665         /* drop incomplete packets even if the missing bytes wouldn't matter */
 666         if (unlikely(urb->actual_length < IP_MSGSIZE)) {
 667                 dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
 668                          urb->actual_length);
 669                 goto resubmit;
 670         }
 671
 672         l = (unsigned) ucs->int_in_buf[1] +
 673             (((unsigned) ucs->int_in_buf[2]) << 8);
 674
 675         gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
 676                 urb->actual_length, (int)ucs->int_in_buf[0], l,
 677                 (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
 678
 679         channel = 0;
 680
 681         switch (ucs->int_in_buf[0]) {
 682         case HD_DEVICE_INIT_OK:
 683                 update_basstate(ucs, BS_INIT, 0);
 684                 break;
 685
 686         case HD_READY_SEND_ATDATA:
 687                 del_timer(&ucs->timer_atrdy);
 688                 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
 689                 start_cbsend(cs);
 690                 break;
 691
 692         case HD_OPEN_B2CHANNEL_ACK:
 693                 ++channel;
 694         case HD_OPEN_B1CHANNEL_ACK:
 695                 bcs = cs->bcs + channel;
 696                 update_basstate(ucs, BS_B1OPEN << channel, 0);
 697                 gigaset_bchannel_up(bcs);
 698                 break;
 699
 700         case HD_OPEN_ATCHANNEL_ACK:
 701                 update_basstate(ucs, BS_ATOPEN, 0);
 702                 start_cbsend(cs);
 703                 break;
 704
 705         case HD_CLOSE_B2CHANNEL_ACK:
 706                 ++channel;
 707         case HD_CLOSE_B1CHANNEL_ACK:
 708                 bcs = cs->bcs + channel;
 709                 update_basstate(ucs, 0, BS_B1OPEN << channel);
 710                 stopurbs(bcs->hw.bas);
 711                 gigaset_bchannel_down(bcs);
 712                 break;
 713
 714         case HD_CLOSE_ATCHANNEL_ACK:
 715                 update_basstate(ucs, 0, BS_ATOPEN);
 716                 break;
 717
 718         case HD_B2_FLOW_CONTROL:
 719                 ++channel;
 720         case HD_B1_FLOW_CONTROL:
 721                 bcs = cs->bcs + channel;
 722                 atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
 723                            &bcs->hw.bas->corrbytes);
 724                 gig_dbg(DEBUG_ISO,
 725                         "Flow control (channel %d, sub %d): 0x%02x => %d",
 726                         channel, bcs->hw.bas->numsub, l,
 727                         atomic_read(&bcs->hw.bas->corrbytes));
 728                 break;
 729
 730         case HD_RECEIVEATDATA_ACK:      /* AT response ready to be received */
 731                 if (!l) {
 732                         dev_warn(cs->dev,
 733                                 "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
 734                         break;
 735                 }
 736                 spin_lock_irqsave(&cs->lock, flags);
 737                 if (ucs->rcvbuf_size) {
 738                         /* throw away previous buffer - we have no queue */
 739                         dev_err(cs->dev,
 740                                 "receive AT data overrun, %d bytes lost\n",
 741                                 ucs->rcvbuf_size);
 742                         kfree(ucs->rcvbuf);
 743                         ucs->rcvbuf_size = 0;
 744                 }
 745                 if ((ucs->rcvbuf = kmalloc(l, GFP_ATOMIC)) == NULL) {
 746                         spin_unlock_irqrestore(&cs->lock, flags);
 747                         dev_err(cs->dev, "out of memory receiving AT data\n");
 748                         error_reset(cs);
 749                         break;
 750                 }
 751                 ucs->rcvbuf_size = l;
 752                 ucs->retry_cmd_in = 0;
 753                 if ((rc = atread_submit(cs, BAS_TIMEOUT)) < 0) {
 754                         kfree(ucs->rcvbuf);
 755                         ucs->rcvbuf = NULL;
 756                         ucs->rcvbuf_size = 0;
 757                         if (rc != -ENODEV) {
 758                                 //FIXME corrective action?
 759                                 spin_unlock_irqrestore(&cs->lock, flags);
 760                                 error_reset(cs);
 761                                 break;
 762                         }
 763                 }
 764                 spin_unlock_irqrestore(&cs->lock, flags);
 765                 break;
 766
 767         case HD_RESET_INTERRUPT_PIPE_ACK:
 768                 update_basstate(ucs, 0, BS_RESETTING);
 769                 dev_notice(cs->dev, "interrupt pipe reset\n");
 770                 break;
 771
 772         case HD_SUSPEND_END:
 773                 gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
 774                 break;
 775
 776         default:
 777                 dev_warn(cs->dev,
 778                          "unknown Gigaset signal 0x%02x (%u) ignored\n",
 779                          (int) ucs->int_in_buf[0], l);
 780         }
 781
 782         check_pending(ucs);
 783         wake_up(&ucs->waitqueue);
 784
 785 resubmit:
 786         rc = usb_submit_urb(urb, GFP_ATOMIC);
 787         if (unlikely(rc != 0 && rc != -ENODEV)) {
 788                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
 789                         get_usb_rcmsg(rc));
 790                 error_reset(cs);
 791         }
 792 }
 793
 794 /* read_iso_callback
 795  * USB completion handler for B channel isochronous input
 796  * called by the USB subsystem in interrupt context
 797  * parameter:
 798  *      urb     USB request block of completed request
 799  *              urb->context = bc_state structure
 800  */
 801 static void read_iso_callback(struct urb *urb)
 802 {
 803         struct bc_state *bcs;
 804         struct bas_bc_state *ubc;
 805         int status = urb->status;
 806         unsigned long flags;
 807         int i, rc;
 808
 809         /* status codes not worth bothering the tasklet with */
 810         if (unlikely(status == -ENOENT ||
 811                      status == -ECONNRESET ||
 812                      status == -EINPROGRESS ||
 813                      status == -ENODEV ||
 814                      status == -ESHUTDOWN)) {
 815                 gig_dbg(DEBUG_ISO, "%s: %s",
 816                         __func__, get_usb_statmsg(status));
 817                 return;
 818         }
 819
 820         bcs = urb->context;
 821         ubc = bcs->hw.bas;
 822
 823         spin_lock_irqsave(&ubc->isoinlock, flags);
 824         if (likely(ubc->isoindone == NULL)) {
 825                 /* pass URB to tasklet */
 826                 ubc->isoindone = urb;
 827                 ubc->isoinstatus = status;
 828                 tasklet_hi_schedule(&ubc->rcvd_tasklet);
 829         } else {
 830                 /* tasklet still busy, drop data and resubmit URB */
 831                 ubc->loststatus = status;
 832                 for (i = 0; i < BAS_NUMFRAMES; i++) {
 833                         ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
 834                         if (unlikely(urb->iso_frame_desc[i].status != 0 &&
 835                                      urb->iso_frame_desc[i].status !=
 836                                                                 -EINPROGRESS))
 837                                 ubc->loststatus = urb->iso_frame_desc[i].status;
 838                         urb->iso_frame_desc[i].status = 0;
 839                         urb->iso_frame_desc[i].actual_length = 0;
 840                 }
 841                 if (likely(ubc->running)) {
 842                         /* urb->dev is clobbered by USB subsystem */
 843                         urb->dev = bcs->cs->hw.bas->udev;
 844                         urb->transfer_flags = URB_ISO_ASAP;
 845                         urb->number_of_packets = BAS_NUMFRAMES;
 846                         gig_dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit",
 847                                 __func__);
 848                         rc = usb_submit_urb(urb, GFP_ATOMIC);
 849                         if (unlikely(rc != 0 && rc != -ENODEV)) {
 850                                 dev_err(bcs->cs->dev,
 851                                         "could not resubmit isochronous read "
 852                                         "URB: %s\n", get_usb_rcmsg(rc));
 853                                 dump_urb(DEBUG_ISO, "isoc read", urb);
 854                                 error_hangup(bcs);
 855                         }
 856                 }
 857         }
 858         spin_unlock_irqrestore(&ubc->isoinlock, flags);
 859 }
 860
 861 /* write_iso_callback
 862  * USB completion handler for B channel isochronous output
 863  * called by the USB subsystem in interrupt context
 864  * parameter:
 865  *      urb     USB request block of completed request
 866  *              urb->context = isow_urbctx_t structure
 867  */
 868 static void write_iso_callback(struct urb *urb)
 869 {
 870         struct isow_urbctx_t *ucx;
 871         struct bas_bc_state *ubc;
 872         int status = urb->status;
 873         unsigned long flags;
 874
 875         /* status codes not worth bothering the tasklet with */
 876         if (unlikely(status == -ENOENT ||
 877                      status == -ECONNRESET ||
 878                      status == -EINPROGRESS ||
 879                      status == -ENODEV ||
 880                      status == -ESHUTDOWN)) {
 881                 gig_dbg(DEBUG_ISO, "%s: %s",
 882                         __func__, get_usb_statmsg(status));
 883                 return;
 884         }
 885
 886         /* pass URB context to tasklet */
 887         ucx = urb->context;
 888         ubc = ucx->bcs->hw.bas;
 889         ucx->status = status;
 890
 891         spin_lock_irqsave(&ubc->isooutlock, flags);
 892         ubc->isooutovfl = ubc->isooutdone;
 893         ubc->isooutdone = ucx;
 894         spin_unlock_irqrestore(&ubc->isooutlock, flags);
 895         tasklet_hi_schedule(&ubc->sent_tasklet);
 896 }
 897
 898 /* starturbs
 899  * prepare and submit USB request blocks for isochronous input and output
 900  * argument:
 901  *      B channel control structure
 902  * return value:
 903  *      0 on success
 904  *      < 0 on error (no URBs submitted)
 905  */
 906 static int starturbs(struct bc_state *bcs)
 907 {
 908         struct bas_bc_state *ubc = bcs->hw.bas;
 909         struct urb *urb;
 910         int j, k;
 911         int rc;
 912
 913         /* initialize L2 reception */
 914         if (bcs->proto2 == L2_HDLC)
 915                 bcs->inputstate |= INS_flag_hunt;
 916
 917         /* submit all isochronous input URBs */
 918         ubc->running = 1;
 919         for (k = 0; k < BAS_INURBS; k++) {
 920                 urb = ubc->isoinurbs[k];
 921                 if (!urb) {
 922                         rc = -EFAULT;
 923                         goto error;
 924                 }
 925
 926                 urb->dev = bcs->cs->hw.bas->udev;
 927                 urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
 928                 urb->transfer_flags = URB_ISO_ASAP;
 929                 urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
 930                 urb->transfer_buffer_length = BAS_INBUFSIZE;
 931                 urb->number_of_packets = BAS_NUMFRAMES;
 932                 urb->interval = BAS_FRAMETIME;
 933                 urb->complete = read_iso_callback;
 934                 urb->context = bcs;
 935                 for (j = 0; j < BAS_NUMFRAMES; j++) {
 936                         urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
 937                         urb->iso_frame_desc[j].length = BAS_MAXFRAME;
 938                         urb->iso_frame_desc[j].status = 0;
 939                         urb->iso_frame_desc[j].actual_length = 0;
 940                 }
 941
 942                 dump_urb(DEBUG_ISO, "Initial isoc read", urb);
 943                 if ((rc = usb_submit_urb(urb, GFP_ATOMIC)) != 0)
 944                         goto error;
 945         }
 946
 947         /* initialize L2 transmission */
 948         gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
 949
 950         /* set up isochronous output URBs for flag idling */
 951         for (k = 0; k < BAS_OUTURBS; ++k) {
 952                 urb = ubc->isoouturbs[k].urb;
 953                 if (!urb) {
 954                         rc = -EFAULT;
 955                         goto error;
 956                 }
 957                 urb->dev = bcs->cs->hw.bas->udev;
 958                 urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
 959                 urb->transfer_flags = URB_ISO_ASAP;
 960                 urb->transfer_buffer = ubc->isooutbuf->data;
 961                 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
 962                 urb->number_of_packets = BAS_NUMFRAMES;
 963                 urb->interval = BAS_FRAMETIME;
 964                 urb->complete = write_iso_callback;
 965                 urb->context = &ubc->isoouturbs[k];
 966                 for (j = 0; j < BAS_NUMFRAMES; ++j) {
 967                         urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
 968                         urb->iso_frame_desc[j].length = BAS_NORMFRAME;
 969                         urb->iso_frame_desc[j].status = 0;
 970                         urb->iso_frame_desc[j].actual_length = 0;
 971                 }
 972                 ubc->isoouturbs[k].limit = -1;
 973         }
 974
 975         /* keep one URB free, submit the others */
 976         for (k = 0; k < BAS_OUTURBS-1; ++k) {
 977                 dump_urb(DEBUG_ISO, "Initial isoc write", urb);
 978                 rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
 979                 if (rc != 0)
 980                         goto error;
 981         }
 982         dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
 983         ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS-1];
 984         ubc->isooutdone = ubc->isooutovfl = NULL;
 985         return 0;
 986  error:
 987         stopurbs(ubc);
 988         return rc;
 989 }
 990
 991 /* stopurbs
 992  * cancel the USB request blocks for isochronous input and output
 993  * errors are silently ignored
 994  * argument:
 995  *      B channel control structure
 996  */
 997 static void stopurbs(struct bas_bc_state *ubc)
 998 {
 999         int k, rc;
1000
1001         ubc->running = 0;
1002
1003         for (k = 0; k < BAS_INURBS; ++k) {
1004                 rc = usb_unlink_urb(ubc->isoinurbs[k]);
1005                 gig_dbg(DEBUG_ISO,
1006                         "%s: isoc input URB %d unlinked, result = %s",
1007                         __func__, k, get_usb_rcmsg(rc));
1008         }
1009
1010         for (k = 0; k < BAS_OUTURBS; ++k) {
1011                 rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
1012                 gig_dbg(DEBUG_ISO,
1013                         "%s: isoc output URB %d unlinked, result = %s",
1014                         __func__, k, get_usb_rcmsg(rc));
1015         }
1016 }
1017
1018 /* Isochronous Write - Bottom Half */
1019 /* =============================== */
1020
1021 /* submit_iso_write_urb
1022  * fill and submit the next isochronous write URB
1023  * parameters:
1024  *      ucx     context structure containing URB
1025  * return value:
1026  *      number of frames submitted in URB
1027  *      0 if URB not submitted because no data available (isooutbuf busy)
1028  *      error code < 0 on error
1029  */
1030 static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
1031 {
1032         struct urb *urb = ucx->urb;
1033         struct bas_bc_state *ubc = ucx->bcs->hw.bas;
1034         struct usb_iso_packet_descriptor *ifd;
1035         int corrbytes, nframe, rc;
1036
1037         /* urb->dev is clobbered by USB subsystem */
1038         urb->dev = ucx->bcs->cs->hw.bas->udev;
1039         urb->transfer_flags = URB_ISO_ASAP;
1040         urb->transfer_buffer = ubc->isooutbuf->data;
1041         urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1042
1043         for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
1044                 ifd = &urb->iso_frame_desc[nframe];
1045
1046                 /* compute frame length according to flow control */
1047                 ifd->length = BAS_NORMFRAME;
1048                 if ((corrbytes = atomic_read(&ubc->corrbytes)) != 0) {
1049                         gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
1050                                 __func__, corrbytes);
1051                         if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
1052                                 corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
1053                         else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
1054                                 corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
1055                         ifd->length += corrbytes;
1056                         atomic_add(-corrbytes, &ubc->corrbytes);
1057                 }
1058
1059                 /* retrieve block of data to send */
1060                 rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
1061                 if (rc < 0) {
1062                         if (rc == -EBUSY) {
1063                                 gig_dbg(DEBUG_ISO,
1064                                         "%s: buffer busy at frame %d",
1065                                         __func__, nframe);
1066                                 /* tasklet will be restarted from
1067                                    gigaset_isoc_send_skb() */
1068                         } else {
1069                                 dev_err(ucx->bcs->cs->dev,
1070                                         "%s: buffer error %d at frame %d\n",
1071                                         __func__, rc, nframe);
1072                                 return rc;
1073                         }
1074                         break;
1075                 }
1076                 ifd->offset = rc;
1077                 ucx->limit = ubc->isooutbuf->nextread;
1078                 ifd->status = 0;
1079                 ifd->actual_length = 0;
1080         }
1081         if (unlikely(nframe == 0))
1082                 return 0;       /* no data to send */
1083         urb->number_of_packets = nframe;
1084
1085         rc = usb_submit_urb(urb, GFP_ATOMIC);
1086         if (unlikely(rc)) {
1087                 if (rc == -ENODEV)
1088                         /* device removed - give up silently */
1089                         gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
1090                 else
1091                         dev_err(ucx->bcs->cs->dev,
1092                                 "could not submit isochronous write URB: %s\n",
1093                                 get_usb_rcmsg(rc));
1094                 return rc;
1095         }
1096         ++ubc->numsub;
1097         return nframe;
1098 }
1099
1100 /* write_iso_tasklet
1101  * tasklet scheduled when an isochronous output URB from the Gigaset device
1102  * has completed
1103  * parameter:
1104  *      data    B channel state structure
1105  */
1106 static void write_iso_tasklet(unsigned long data)
1107 {
1108         struct bc_state *bcs = (struct bc_state *) data;
1109         struct bas_bc_state *ubc = bcs->hw.bas;
1110         struct cardstate *cs = bcs->cs;
1111         struct isow_urbctx_t *done, *next, *ovfl;
1112         struct urb *urb;
1113         int status;
1114         struct usb_iso_packet_descriptor *ifd;
1115         int offset;
1116         unsigned long flags;
1117         int i;
1118         struct sk_buff *skb;
1119         int len;
1120         int rc;
1121
1122         /* loop while completed URBs arrive in time */
1123         for (;;) {
1124                 if (unlikely(!(ubc->running))) {
1125                         gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1126                         return;
1127                 }
1128
1129                 /* retrieve completed URBs */
1130                 spin_lock_irqsave(&ubc->isooutlock, flags);
1131                 done = ubc->isooutdone;
1132                 ubc->isooutdone = NULL;
1133                 ovfl = ubc->isooutovfl;
1134                 ubc->isooutovfl = NULL;
1135                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1136                 if (ovfl) {
1137                         dev_err(cs->dev, "isochronous write buffer underrun\n");
1138                         error_hangup(bcs);
1139                         break;
1140                 }
1141                 if (!done)
1142                         break;
1143
1144                 /* submit free URB if available */
1145                 spin_lock_irqsave(&ubc->isooutlock, flags);
1146                 next = ubc->isooutfree;
1147                 ubc->isooutfree = NULL;
1148                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1149                 if (next) {
1150                         rc = submit_iso_write_urb(next);
1151                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1152                                 /* could not submit URB, put it back */
1153                                 spin_lock_irqsave(&ubc->isooutlock, flags);
1154                                 if (ubc->isooutfree == NULL) {
1155                                         ubc->isooutfree = next;
1156                                         next = NULL;
1157                                 }
1158                                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1159                                 if (next) {
1160                                         /* couldn't put it back */
1161                                         dev_err(cs->dev,
1162                                               "losing isochronous write URB\n");
1163                                         error_hangup(bcs);
1164                                 }
1165                         }
1166                 }
1167
1168                 /* process completed URB */
1169                 urb = done->urb;
1170                 status = done->status;
1171                 switch (status) {
1172                 case -EXDEV:                    /* partial completion */
1173                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1174                                 __func__);
1175                         /* fall through - what's the difference anyway? */
1176                 case 0:                         /* normal completion */
1177                         /* inspect individual frames
1178                          * assumptions (for lack of documentation):
1179                          * - actual_length bytes of first frame in error are
1180                          *   successfully sent
1181                          * - all following frames are not sent at all
1182                          */
1183                         offset = done->limit;   /* default (no error) */
1184                         for (i = 0; i < BAS_NUMFRAMES; i++) {
1185                                 ifd = &urb->iso_frame_desc[i];
1186                                 if (ifd->status ||
1187                                     ifd->actual_length != ifd->length) {
1188                                         dev_warn(cs->dev,
1189                                              "isochronous write: frame %d: %s, "
1190                                              "only %d of %d bytes sent\n",
1191                                              i, get_usb_statmsg(ifd->status),
1192                                              ifd->actual_length, ifd->length);
1193                                         offset = (ifd->offset +
1194                                                   ifd->actual_length)
1195                                                  % BAS_OUTBUFSIZE;
1196                                         break;
1197                                 }
1198                         }
1199 #ifdef CONFIG_GIGASET_DEBUG
1200                         /* check assumption on remaining frames */
1201                         for (; i < BAS_NUMFRAMES; i++) {
1202                                 ifd = &urb->iso_frame_desc[i];
1203                                 if (ifd->status != -EINPROGRESS
1204                                     || ifd->actual_length != 0) {
1205                                         dev_warn(cs->dev,
1206                                              "isochronous write: frame %d: %s, "
1207                                              "%d of %d bytes sent\n",
1208                                              i, get_usb_statmsg(ifd->status),
1209                                              ifd->actual_length, ifd->length);
1210                                         offset = (ifd->offset +
1211                                                   ifd->actual_length)
1212                                                  % BAS_OUTBUFSIZE;
1213                                         break;
1214                                 }
1215                         }
1216 #endif
1217                         break;
1218                 case -EPIPE:                    /* stall - probably underrun */
1219                         dev_err(cs->dev, "isochronous write stalled\n");
1220                         error_hangup(bcs);
1221                         break;
1222                 default:                        /* severe trouble */
1223                         dev_warn(cs->dev, "isochronous write: %s\n",
1224                                  get_usb_statmsg(status));
1225                 }
1226
1227                 /* mark the write buffer area covered by this URB as free */
1228                 if (done->limit >= 0)
1229                         ubc->isooutbuf->read = done->limit;
1230
1231                 /* mark URB as free */
1232                 spin_lock_irqsave(&ubc->isooutlock, flags);
1233                 next = ubc->isooutfree;
1234                 ubc->isooutfree = done;
1235                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1236                 if (next) {
1237                         /* only one URB still active - resubmit one */
1238                         rc = submit_iso_write_urb(next);
1239                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1240                                 /* couldn't submit */
1241                                 error_hangup(bcs);
1242                         }
1243                 }
1244         }
1245
1246         /* process queued SKBs */
1247         while ((skb = skb_dequeue(&bcs->squeue))) {
1248                 /* copy to output buffer, doing L2 encapsulation */
1249                 len = skb->len;
1250                 if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
1251                         /* insufficient buffer space, push back onto queue */
1252                         skb_queue_head(&bcs->squeue, skb);
1253                         gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
1254                                 __func__, skb_queue_len(&bcs->squeue));
1255                         break;
1256                 }
1257                 skb_pull(skb, len);
1258                 gigaset_skb_sent(bcs, skb);
1259                 dev_kfree_skb_any(skb);
1260         }
1261 }
1262
1263 /* Isochronous Read - Bottom Half */
1264 /* ============================== */
1265
1266 /* read_iso_tasklet
1267  * tasklet scheduled when an isochronous input URB from the Gigaset device
1268  * has completed
1269  * parameter:
1270  *      data    B channel state structure
1271  */
1272 static void read_iso_tasklet(unsigned long data)
1273 {
1274         struct bc_state *bcs = (struct bc_state *) data;
1275         struct bas_bc_state *ubc = bcs->hw.bas;
1276         struct cardstate *cs = bcs->cs;
1277         struct urb *urb;
1278         int status;
1279         char *rcvbuf;
1280         unsigned long flags;
1281         int totleft, numbytes, offset, frame, rc;
1282
1283         /* loop while more completed URBs arrive in the meantime */
1284         for (;;) {
1285                 /* retrieve URB */
1286                 spin_lock_irqsave(&ubc->isoinlock, flags);
1287                 if (!(urb = ubc->isoindone)) {
1288                         spin_unlock_irqrestore(&ubc->isoinlock, flags);
1289                         return;
1290                 }
1291                 status = ubc->isoinstatus;
1292                 ubc->isoindone = NULL;
1293                 if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1294                         dev_warn(cs->dev,
1295                                  "isochronous read overrun, "
1296                                  "dropped URB with status: %s, %d bytes lost\n",
1297                                  get_usb_statmsg(ubc->loststatus),
1298                                  ubc->isoinlost);
1299                         ubc->loststatus = -EINPROGRESS;
1300                 }
1301                 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1302
1303                 if (unlikely(!(ubc->running))) {
1304                         gig_dbg(DEBUG_ISO,
1305                                 "%s: channel not running, "
1306                                 "dropped URB with status: %s",
1307                                 __func__, get_usb_statmsg(status));
1308                         return;
1309                 }
1310
1311                 switch (status) {
1312                 case 0:                         /* normal completion */
1313                         break;
1314                 case -EXDEV:                    /* inspect individual frames
1315                                                    (we do that anyway) */
1316                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1317                                 __func__);
1318                         break;
1319                 case -ENOENT:
1320                 case -ECONNRESET:
1321                 case -EINPROGRESS:
1322                         gig_dbg(DEBUG_ISO, "%s: %s",
1323                                 __func__, get_usb_statmsg(status));
1324                         continue;               /* -> skip */
1325                 case -EPIPE:
1326                         dev_err(cs->dev, "isochronous read stalled\n");
1327                         error_hangup(bcs);
1328                         continue;               /* -> skip */
1329                 default:                        /* severe trouble */
1330                         dev_warn(cs->dev, "isochronous read: %s\n",
1331                                  get_usb_statmsg(status));
1332                         goto error;
1333                 }
1334
1335                 rcvbuf = urb->transfer_buffer;
1336                 totleft = urb->actual_length;
1337                 for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1338                         numbytes = urb->iso_frame_desc[frame].actual_length;
1339                         if (unlikely(urb->iso_frame_desc[frame].status))
1340                                 dev_warn(cs->dev,
1341                                          "isochronous read: frame %d[%d]: %s\n",
1342                                          frame, numbytes,
1343                                          get_usb_statmsg(
1344                                             urb->iso_frame_desc[frame].status));
1345                         if (unlikely(numbytes > BAS_MAXFRAME))
1346                                 dev_warn(cs->dev,
1347                                          "isochronous read: frame %d: "
1348                                          "numbytes (%d) > BAS_MAXFRAME\n",
1349                                          frame, numbytes);
1350                         if (unlikely(numbytes > totleft)) {
1351                                 dev_warn(cs->dev,
1352                                          "isochronous read: frame %d: "
1353                                          "numbytes (%d) > totleft (%d)\n",
1354                                          frame, numbytes, totleft);
1355                                 numbytes = totleft;
1356                         }
1357                         offset = urb->iso_frame_desc[frame].offset;
1358                         if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1359                                 dev_warn(cs->dev,
1360                                          "isochronous read: frame %d: "
1361                                          "offset (%d) + numbytes (%d) "
1362                                          "> BAS_INBUFSIZE\n",
1363                                          frame, offset, numbytes);
1364                                 numbytes = BAS_INBUFSIZE - offset;
1365                         }
1366                         gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1367                         totleft -= numbytes;
1368                 }
1369                 if (unlikely(totleft > 0))
1370                         dev_warn(cs->dev,
1371                                  "isochronous read: %d data bytes missing\n",
1372                                  totleft);
1373
1374         error:
1375                 /* URB processed, resubmit */
1376                 for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1377                         urb->iso_frame_desc[frame].status = 0;
1378                         urb->iso_frame_desc[frame].actual_length = 0;
1379                 }
1380                 /* urb->dev is clobbered by USB subsystem */
1381                 urb->dev = bcs->cs->hw.bas->udev;
1382                 urb->transfer_flags = URB_ISO_ASAP;
1383                 urb->number_of_packets = BAS_NUMFRAMES;
1384                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1385                 if (unlikely(rc != 0 && rc != -ENODEV)) {
1386                         dev_err(cs->dev,
1387                                 "could not resubmit isochronous read URB: %s\n",
1388                                 get_usb_rcmsg(rc));
1389                         dump_urb(DEBUG_ISO, "resubmit iso read", urb);
1390                         error_hangup(bcs);
1391                 }
1392         }
1393 }
1394
1395 /* Channel Operations */
1396 /* ================== */
1397
1398 /* req_timeout
1399  * timeout routine for control output request
1400  * argument:
1401  *      B channel control structure
1402  */
1403 static void req_timeout(unsigned long data)
1404 {
1405         struct bc_state *bcs = (struct bc_state *) data;
1406         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1407         int pending;
1408         unsigned long flags;
1409
1410         check_pending(ucs);
1411
1412         spin_lock_irqsave(&ucs->lock, flags);
1413         pending = ucs->pending;
1414         ucs->pending = 0;
1415         spin_unlock_irqrestore(&ucs->lock, flags);
1416
1417         switch (pending) {
1418         case 0:                                 /* no pending request */
1419                 gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1420                 break;
1421
1422         case HD_OPEN_ATCHANNEL:
1423                 dev_err(bcs->cs->dev, "timeout opening AT channel\n");
1424                 error_reset(bcs->cs);
1425                 break;
1426
1427         case HD_OPEN_B2CHANNEL:
1428         case HD_OPEN_B1CHANNEL:
1429                 dev_err(bcs->cs->dev, "timeout opening channel %d\n",
1430                         bcs->channel + 1);
1431                 error_hangup(bcs);
1432                 break;
1433
1434         case HD_CLOSE_ATCHANNEL:
1435                 dev_err(bcs->cs->dev, "timeout closing AT channel\n");
1436                 error_reset(bcs->cs);
1437                 break;
1438
1439         case HD_CLOSE_B2CHANNEL:
1440         case HD_CLOSE_B1CHANNEL:
1441                 dev_err(bcs->cs->dev, "timeout closing channel %d\n",
1442                         bcs->channel + 1);
1443                 error_reset(bcs->cs);
1444                 break;
1445
1446         case HD_RESET_INTERRUPT_PIPE:
1447                 /* error recovery escalation */
1448                 dev_err(bcs->cs->dev,
1449                         "reset interrupt pipe timeout, attempting USB reset\n");
1450                 usb_queue_reset_device(bcs->cs->hw.bas->interface);
1451                 break;
1452
1453         default:
1454                 dev_warn(bcs->cs->dev, "request 0x%02x timed out, clearing\n",
1455                          pending);
1456         }
1457
1458         wake_up(&ucs->waitqueue);
1459 }
1460
1461 /* write_ctrl_callback
1462  * USB completion handler for control pipe output
1463  * called by the USB subsystem in interrupt context
1464  * parameter:
1465  *      urb     USB request block of completed request
1466  *              urb->context = hardware specific controller state structure
1467  */
1468 static void write_ctrl_callback(struct urb *urb)
1469 {
1470         struct bas_cardstate *ucs = urb->context;
1471         int status = urb->status;
1472         int rc;
1473         unsigned long flags;
1474
1475         /* check status */
1476         switch (status) {
1477         case 0:                                 /* normal completion */
1478                 spin_lock_irqsave(&ucs->lock, flags);
1479                 switch (ucs->pending) {
1480                 case HD_DEVICE_INIT_ACK:        /* no reply expected */
1481                         del_timer(&ucs->timer_ctrl);
1482                         ucs->pending = 0;
1483                         break;
1484                 }
1485                 spin_unlock_irqrestore(&ucs->lock, flags);
1486                 return;
1487
1488         case -ENOENT:                   /* cancelled */
1489         case -ECONNRESET:               /* cancelled (async) */
1490         case -EINPROGRESS:              /* pending */
1491         case -ENODEV:                   /* device removed */
1492         case -ESHUTDOWN:                /* device shut down */
1493                 /* ignore silently */
1494                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1495                         __func__, get_usb_statmsg(status));
1496                 break;
1497
1498         default:                                /* any failure */
1499                 /* don't retry if suspend requested */
1500                 if (++ucs->retry_ctrl > BAS_RETRY ||
1501                     (ucs->basstate & BS_SUSPEND)) {
1502                         dev_err(&ucs->interface->dev,
1503                                 "control request 0x%02x failed: %s\n",
1504                                 ucs->dr_ctrl.bRequest,
1505                                 get_usb_statmsg(status));
1506                         break;          /* give up */
1507                 }
1508                 dev_notice(&ucs->interface->dev,
1509                            "control request 0x%02x: %s, retry %d\n",
1510                            ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
1511                            ucs->retry_ctrl);
1512                 /* urb->dev is clobbered by USB subsystem */
1513                 urb->dev = ucs->udev;
1514                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1515                 if (unlikely(rc)) {
1516                         dev_err(&ucs->interface->dev,
1517                                 "could not resubmit request 0x%02x: %s\n",
1518                                 ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
1519                         break;
1520                 }
1521                 /* resubmitted */
1522                 return;
1523         }
1524
1525         /* failed, clear pending request */
1526         spin_lock_irqsave(&ucs->lock, flags);
1527         del_timer(&ucs->timer_ctrl);
1528         ucs->pending = 0;
1529         spin_unlock_irqrestore(&ucs->lock, flags);
1530         wake_up(&ucs->waitqueue);
1531 }
1532
1533 /* req_submit
1534  * submit a control output request without message buffer to the Gigaset base
1535  * and optionally start a timeout
1536  * parameters:
1537  *      bcs     B channel control structure
1538  *      req     control request code (HD_*)
1539  *      val     control request parameter value (set to 0 if unused)
1540  *      timeout timeout in seconds (0: no timeout)
1541  * return value:
1542  *      0 on success
1543  *      -EBUSY if another request is pending
1544  *      any URB submission error code
1545  */
1546 static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1547 {
1548         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1549         int ret;
1550         unsigned long flags;
1551
1552         gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1553
1554         spin_lock_irqsave(&ucs->lock, flags);
1555         if (ucs->pending) {
1556                 spin_unlock_irqrestore(&ucs->lock, flags);
1557                 dev_err(bcs->cs->dev,
1558                         "submission of request 0x%02x failed: "
1559                         "request 0x%02x still pending\n",
1560                         req, ucs->pending);
1561                 return -EBUSY;
1562         }
1563
1564         ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1565         ucs->dr_ctrl.bRequest = req;
1566         ucs->dr_ctrl.wValue = cpu_to_le16(val);
1567         ucs->dr_ctrl.wIndex = 0;
1568         ucs->dr_ctrl.wLength = 0;
1569         usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1570                              usb_sndctrlpipe(ucs->udev, 0),
1571                              (unsigned char*) &ucs->dr_ctrl, NULL, 0,
1572                              write_ctrl_callback, ucs);
1573         ucs->retry_ctrl = 0;
1574         ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
1575         if (unlikely(ret)) {
1576                 dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1577                         req, get_usb_rcmsg(ret));
1578                 spin_unlock_irqrestore(&ucs->lock, flags);
1579                 return ret;
1580         }
1581         ucs->pending = req;
1582
1583         if (timeout > 0) {
1584                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1585                 ucs->timer_ctrl.expires = jiffies + timeout * HZ / 10;
1586                 ucs->timer_ctrl.data = (unsigned long) bcs;
1587                 ucs->timer_ctrl.function = req_timeout;
1588                 add_timer(&ucs->timer_ctrl);
1589         }
1590
1591         spin_unlock_irqrestore(&ucs->lock, flags);
1592         return 0;
1593 }
1594
1595 /* gigaset_init_bchannel
1596  * called by common.c to connect a B channel
1597  * initialize isochronous I/O and tell the Gigaset base to open the channel
1598  * argument:
1599  *      B channel control structure
1600  * return value:
1601  *      0 on success, error code < 0 on error
1602  */
1603 static int gigaset_init_bchannel(struct bc_state *bcs)
1604 {
1605         struct cardstate *cs = bcs->cs;
1606         int req, ret;
1607         unsigned long flags;
1608
1609         spin_lock_irqsave(&cs->lock, flags);
1610         if (unlikely(!cs->connected)) {
1611                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1612                 spin_unlock_irqrestore(&cs->lock, flags);
1613                 return -ENODEV;
1614         }
1615
1616         if (cs->hw.bas->basstate & BS_SUSPEND) {
1617                 dev_notice(cs->dev,
1618                            "not starting isochronous I/O, "
1619                            "suspend in progress\n");
1620                 spin_unlock_irqrestore(&cs->lock, flags);
1621                 return -EHOSTUNREACH;
1622         }
1623
1624         if ((ret = starturbs(bcs)) < 0) {
1625                 dev_err(cs->dev,
1626                         "could not start isochronous I/O for channel B%d: %s\n",
1627                         bcs->channel + 1,
1628                         ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
1629                 if (ret != -ENODEV)
1630                         error_hangup(bcs);
1631                 spin_unlock_irqrestore(&cs->lock, flags);
1632                 return ret;
1633         }
1634
1635         req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1636         if ((ret = req_submit(bcs, req, 0, BAS_TIMEOUT)) < 0) {
1637                 dev_err(cs->dev, "could not open channel B%d\n",
1638                         bcs->channel + 1);
1639                 stopurbs(bcs->hw.bas);
1640                 if (ret != -ENODEV)
1641                         error_hangup(bcs);
1642         }
1643
1644         spin_unlock_irqrestore(&cs->lock, flags);
1645         return ret;
1646 }
1647
1648 /* gigaset_close_bchannel
1649  * called by common.c to disconnect a B channel
1650  * tell the Gigaset base to close the channel
1651  * stopping isochronous I/O and LL notification will be done when the
1652  * acknowledgement for the close arrives
1653  * argument:
1654  *      B channel control structure
1655  * return value:
1656  *      0 on success, error code < 0 on error
1657  */
1658 static int gigaset_close_bchannel(struct bc_state *bcs)
1659 {
1660         struct cardstate *cs = bcs->cs;
1661         int req, ret;
1662         unsigned long flags;
1663
1664         spin_lock_irqsave(&cs->lock, flags);
1665         if (unlikely(!cs->connected)) {
1666                 spin_unlock_irqrestore(&cs->lock, flags);
1667                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1668                 return -ENODEV;
1669         }
1670
1671         if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1672                 /* channel not running: just signal common.c */
1673                 spin_unlock_irqrestore(&cs->lock, flags);
1674                 gigaset_bchannel_down(bcs);
1675                 return 0;
1676         }
1677
1678         /* channel running: tell device to close it */
1679         req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1680         if ((ret = req_submit(bcs, req, 0, BAS_TIMEOUT)) < 0)
1681                 dev_err(cs->dev, "closing channel B%d failed\n",
1682                         bcs->channel + 1);
1683
1684         spin_unlock_irqrestore(&cs->lock, flags);
1685         return ret;
1686 }
1687
1688 /* Device Operations */
1689 /* ================= */
1690
1691 /* complete_cb
1692  * unqueue first command buffer from queue, waking any sleepers
1693  * must be called with cs->cmdlock held
1694  * parameter:
1695  *      cs      controller state structure
1696  */
1697 static void complete_cb(struct cardstate *cs)
1698 {
1699         struct cmdbuf_t *cb = cs->cmdbuf;
1700
1701         /* unqueue completed buffer */
1702         cs->cmdbytes -= cs->curlen;
1703         gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD,
1704                 "write_command: sent %u bytes, %u left",
1705                 cs->curlen, cs->cmdbytes);
1706         if ((cs->cmdbuf = cb->next) != NULL) {
1707                 cs->cmdbuf->prev = NULL;
1708                 cs->curlen = cs->cmdbuf->len;
1709         } else {
1710                 cs->lastcmdbuf = NULL;
1711                 cs->curlen = 0;
1712         }
1713
1714         if (cb->wake_tasklet)
1715                 tasklet_schedule(cb->wake_tasklet);
1716
1717         kfree(cb);
1718 }
1719
1720 /* write_command_callback
1721  * USB completion handler for AT command transmission
1722  * called by the USB subsystem in interrupt context
1723  * parameter:
1724  *      urb     USB request block of completed request
1725  *              urb->context = controller state structure
1726  */
1727 static void write_command_callback(struct urb *urb)
1728 {
1729         struct cardstate *cs = urb->context;
1730         struct bas_cardstate *ucs = cs->hw.bas;
1731         int status = urb->status;
1732         unsigned long flags;
1733
1734         update_basstate(ucs, 0, BS_ATWRPEND);
1735         wake_up(&ucs->waitqueue);
1736
1737         /* check status */
1738         switch (status) {
1739         case 0:                                 /* normal completion */
1740                 break;
1741         case -ENOENT:                   /* cancelled */
1742         case -ECONNRESET:               /* cancelled (async) */
1743         case -EINPROGRESS:              /* pending */
1744         case -ENODEV:                   /* device removed */
1745         case -ESHUTDOWN:                /* device shut down */
1746                 /* ignore silently */
1747                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1748                         __func__, get_usb_statmsg(status));
1749                 return;
1750         default:                                /* any failure */
1751                 if (++ucs->retry_cmd_out > BAS_RETRY) {
1752                         dev_warn(cs->dev,
1753                                  "command write: %s, "
1754                                  "giving up after %d retries\n",
1755                                  get_usb_statmsg(status),
1756                                  ucs->retry_cmd_out);
1757                         break;
1758                 }
1759                 if (ucs->basstate & BS_SUSPEND) {
1760                         dev_warn(cs->dev,
1761                                  "command write: %s, "
1762                                  "won't retry - suspend requested\n",
1763                                  get_usb_statmsg(status));
1764                         break;
1765                 }
1766                 if (cs->cmdbuf == NULL) {
1767                         dev_warn(cs->dev,
1768                                  "command write: %s, "
1769                                  "cannot retry - cmdbuf gone\n",
1770                                  get_usb_statmsg(status));
1771                         break;
1772                 }
1773                 dev_notice(cs->dev, "command write: %s, retry %d\n",
1774                            get_usb_statmsg(status), ucs->retry_cmd_out);
1775                 if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1776                         /* resubmitted - bypass regular exit block */
1777                         return;
1778                 /* command send failed, assume base still waiting */
1779                 update_basstate(ucs, BS_ATREADY, 0);
1780         }
1781
1782         spin_lock_irqsave(&cs->cmdlock, flags);
1783         if (cs->cmdbuf != NULL)
1784                 complete_cb(cs);
1785         spin_unlock_irqrestore(&cs->cmdlock, flags);
1786 }
1787
1788 /* atrdy_timeout
1789  * timeout routine for AT command transmission
1790  * argument:
1791  *      controller state structure
1792  */
1793 static void atrdy_timeout(unsigned long data)
1794 {
1795         struct cardstate *cs = (struct cardstate *) data;
1796         struct bas_cardstate *ucs = cs->hw.bas;
1797
1798         dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1799
1800         /* fake the missing signal - what else can I do? */
1801         update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1802         start_cbsend(cs);
1803 }
1804
1805 /* atwrite_submit
1806  * submit an HD_WRITE_ATMESSAGE command URB
1807  * parameters:
1808  *      cs      controller state structure
1809  *      buf     buffer containing command to send
1810  *      len     length of command to send
1811  * return value:
1812  *      0 on success
1813  *      -EBUSY if another request is pending
1814  *      any URB submission error code
1815  */
1816 static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1817 {
1818         struct bas_cardstate *ucs = cs->hw.bas;
1819         int rc;
1820
1821         gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1822
1823         if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1824                 dev_err(cs->dev,
1825                         "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1826                 return -EBUSY;
1827         }
1828
1829         ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1830         ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1831         ucs->dr_cmd_out.wValue = 0;
1832         ucs->dr_cmd_out.wIndex = 0;
1833         ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1834         usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1835                              usb_sndctrlpipe(ucs->udev, 0),
1836                              (unsigned char*) &ucs->dr_cmd_out, buf, len,
1837                              write_command_callback, cs);
1838         rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
1839         if (unlikely(rc)) {
1840                 update_basstate(ucs, 0, BS_ATWRPEND);
1841                 dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1842                         get_usb_rcmsg(rc));
1843                 return rc;
1844         }
1845
1846         /* submitted successfully, start timeout if necessary */
1847         if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1848                 gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
1849                         ATRDY_TIMEOUT);
1850                 ucs->timer_atrdy.expires = jiffies + ATRDY_TIMEOUT * HZ / 10;
1851                 ucs->timer_atrdy.data = (unsigned long) cs;
1852                 ucs->timer_atrdy.function = atrdy_timeout;
1853                 add_timer(&ucs->timer_atrdy);
1854         }
1855         return 0;
1856 }
1857
1858 /* start_cbsend
1859  * start transmission of AT command queue if necessary
1860  * parameter:
1861  *      cs              controller state structure
1862  * return value:
1863  *      0 on success
1864  *      error code < 0 on error
1865  */
1866 static int start_cbsend(struct cardstate *cs)
1867 {
1868         struct cmdbuf_t *cb;
1869         struct bas_cardstate *ucs = cs->hw.bas;
1870         unsigned long flags;
1871         int rc;
1872         int retval = 0;
1873
1874         /* check if suspend requested */
1875         if (ucs->basstate & BS_SUSPEND) {
1876                 gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "suspending");
1877                 return -EHOSTUNREACH;
1878         }
1879
1880         /* check if AT channel is open */
1881         if (!(ucs->basstate & BS_ATOPEN)) {
1882                 gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "AT channel not open");
1883                 rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1884                 if (rc < 0) {
1885                         /* flush command queue */
1886                         spin_lock_irqsave(&cs->cmdlock, flags);
1887                         while (cs->cmdbuf != NULL)
1888                                 complete_cb(cs);
1889                         spin_unlock_irqrestore(&cs->cmdlock, flags);
1890                 }
1891                 return rc;
1892         }
1893
1894         /* try to send first command in queue */
1895         spin_lock_irqsave(&cs->cmdlock, flags);
1896
1897         while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
1898                 ucs->retry_cmd_out = 0;
1899                 rc = atwrite_submit(cs, cb->buf, cb->len);
1900                 if (unlikely(rc)) {
1901                         retval = rc;
1902                         complete_cb(cs);
1903                 }
1904         }
1905
1906         spin_unlock_irqrestore(&cs->cmdlock, flags);
1907         return retval;
1908 }
1909
1910 /* gigaset_write_cmd
1911  * This function is called by the device independent part of the driver
1912  * to transmit an AT command string to the Gigaset device.
1913  * It encapsulates the device specific method for transmission over the
1914  * direct USB connection to the base.
1915  * The command string is added to the queue of commands to send, and
1916  * USB transmission is started if necessary.
1917  * parameters:
1918  *      cs              controller state structure
1919  *      buf             command string to send
1920  *      len             number of bytes to send (max. IF_WRITEBUF)
1921  *      wake_tasklet    tasklet to run when transmission is completed
1922  *                      (NULL if none)
1923  * return value:
1924  *      number of bytes queued on success
1925  *      error code < 0 on error
1926  */
1927 static int gigaset_write_cmd(struct cardstate *cs,
1928                              const unsigned char *buf, int len,
1929                              struct tasklet_struct *wake_tasklet)
1930 {
1931         struct cmdbuf_t *cb;
1932         unsigned long flags;
1933         int rc;
1934
1935         gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
1936                              DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1937                            "CMD Transmit", len, buf);
1938
1939         if (len <= 0) {
1940                 /* nothing to do */
1941                 rc = 0;
1942                 goto notqueued;
1943         }
1944
1945         /* translate "+++" escape sequence sent as a single separate command
1946          * into "close AT channel" command for error recovery
1947          * The next command will reopen the AT channel automatically.
1948          */
1949         if (len == 3 && !memcmp(buf, "+++", 3)) {
1950                 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
1951                 goto notqueued;
1952         }
1953
1954         if (len > IF_WRITEBUF)
1955                 len = IF_WRITEBUF;
1956         if (!(cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC))) {
1957                 dev_err(cs->dev, "%s: out of memory\n", __func__);
1958                 rc = -ENOMEM;
1959                 goto notqueued;
1960         }
1961
1962         memcpy(cb->buf, buf, len);
1963         cb->len = len;
1964         cb->offset = 0;
1965         cb->next = NULL;
1966         cb->wake_tasklet = wake_tasklet;
1967
1968         spin_lock_irqsave(&cs->cmdlock, flags);
1969         cb->prev = cs->lastcmdbuf;
1970         if (cs->lastcmdbuf)
1971                 cs->lastcmdbuf->next = cb;
1972         else {
1973                 cs->cmdbuf = cb;
1974                 cs->curlen = len;
1975         }
1976         cs->cmdbytes += len;
1977         cs->lastcmdbuf = cb;
1978         spin_unlock_irqrestore(&cs->cmdlock, flags);
1979
1980         spin_lock_irqsave(&cs->lock, flags);
1981         if (unlikely(!cs->connected)) {
1982                 spin_unlock_irqrestore(&cs->lock, flags);
1983                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1984                 /* flush command queue */
1985                 spin_lock_irqsave(&cs->cmdlock, flags);
1986                 while (cs->cmdbuf != NULL)
1987                         complete_cb(cs);
1988                 spin_unlock_irqrestore(&cs->cmdlock, flags);
1989                 return -ENODEV;
1990         }
1991         rc = start_cbsend(cs);
1992         spin_unlock_irqrestore(&cs->lock, flags);
1993         return rc < 0 ? rc : len;
1994
1995 notqueued:                      /* request handled without queuing */
1996         if (wake_tasklet)
1997                 tasklet_schedule(wake_tasklet);
1998         return rc;
1999 }
2000
2001 /* gigaset_write_room
2002  * tty_driver.write_room interface routine
2003  * return number of characters the driver will accept to be written via
2004  * gigaset_write_cmd
2005  * parameter:
2006  *      controller state structure
2007  * return value:
2008  *      number of characters
2009  */
2010 static int gigaset_write_room(struct cardstate *cs)
2011 {
2012         return IF_WRITEBUF;
2013 }
2014
2015 /* gigaset_chars_in_buffer
2016  * tty_driver.chars_in_buffer interface routine
2017  * return number of characters waiting to be sent
2018  * parameter:
2019  *      controller state structure
2020  * return value:
2021  *      number of characters
2022  */
2023 static int gigaset_chars_in_buffer(struct cardstate *cs)
2024 {
2025         return cs->cmdbytes;
2026 }
2027
2028 /* gigaset_brkchars
2029  * implementation of ioctl(GIGASET_BRKCHARS)
2030  * parameter:
2031  *      controller state structure
2032  * return value:
2033  *      -EINVAL (unimplemented function)
2034  */
2035 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
2036 {
2037         return -EINVAL;
2038 }
2039
2040
2041 /* Device Initialization/Shutdown */
2042 /* ============================== */
2043
2044 /* Free hardware dependent part of the B channel structure
2045  * parameter:
2046  *      bcs     B channel structure
2047  * return value:
2048  *      !=0 on success
2049  */
2050 static int gigaset_freebcshw(struct bc_state *bcs)
2051 {
2052         struct bas_bc_state *ubc = bcs->hw.bas;
2053         int i;
2054
2055         if (!ubc)
2056                 return 0;
2057
2058         /* kill URBs and tasklets before freeing - better safe than sorry */
2059         ubc->running = 0;
2060         gig_dbg(DEBUG_INIT, "%s: killing iso URBs", __func__);
2061         for (i = 0; i < BAS_OUTURBS; ++i) {
2062                 usb_kill_urb(ubc->isoouturbs[i].urb);
2063                 usb_free_urb(ubc->isoouturbs[i].urb);
2064         }
2065         for (i = 0; i < BAS_INURBS; ++i) {
2066                 usb_kill_urb(ubc->isoinurbs[i]);
2067                 usb_free_urb(ubc->isoinurbs[i]);
2068         }
2069         tasklet_kill(&ubc->sent_tasklet);
2070         tasklet_kill(&ubc->rcvd_tasklet);
2071         kfree(ubc->isooutbuf);
2072         kfree(ubc);
2073         bcs->hw.bas = NULL;
2074         return 1;
2075 }
2076
2077 /* Initialize hardware dependent part of the B channel structure
2078  * parameter:
2079  *      bcs     B channel structure
2080  * return value:
2081  *      !=0 on success
2082  */
2083 static int gigaset_initbcshw(struct bc_state *bcs)
2084 {
2085         int i;
2086         struct bas_bc_state *ubc;
2087
2088         bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
2089         if (!ubc) {
2090                 pr_err("out of memory\n");
2091                 return 0;
2092         }
2093
2094         ubc->running = 0;
2095         atomic_set(&ubc->corrbytes, 0);
2096         spin_lock_init(&ubc->isooutlock);
2097         for (i = 0; i < BAS_OUTURBS; ++i) {
2098                 ubc->isoouturbs[i].urb = NULL;
2099                 ubc->isoouturbs[i].bcs = bcs;
2100         }
2101         ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
2102         ubc->numsub = 0;
2103         if (!(ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL))) {
2104                 pr_err("out of memory\n");
2105                 kfree(ubc);
2106                 bcs->hw.bas = NULL;
2107                 return 0;
2108         }
2109         tasklet_init(&ubc->sent_tasklet,
2110                      &write_iso_tasklet, (unsigned long) bcs);
2111
2112         spin_lock_init(&ubc->isoinlock);
2113         for (i = 0; i < BAS_INURBS; ++i)
2114                 ubc->isoinurbs[i] = NULL;
2115         ubc->isoindone = NULL;
2116         ubc->loststatus = -EINPROGRESS;
2117         ubc->isoinlost = 0;
2118         ubc->seqlen = 0;
2119         ubc->inbyte = 0;
2120         ubc->inbits = 0;
2121         ubc->goodbytes = 0;
2122         ubc->alignerrs = 0;
2123         ubc->fcserrs = 0;
2124         ubc->frameerrs = 0;
2125         ubc->giants = 0;
2126         ubc->runts = 0;
2127         ubc->aborts = 0;
2128         ubc->shared0s = 0;
2129         ubc->stolen0s = 0;
2130         tasklet_init(&ubc->rcvd_tasklet,
2131                      &read_iso_tasklet, (unsigned long) bcs);
2132         return 1;
2133 }
2134
2135 static void gigaset_reinitbcshw(struct bc_state *bcs)
2136 {
2137         struct bas_bc_state *ubc = bcs->hw.bas;
2138
2139         bcs->hw.bas->running = 0;
2140         atomic_set(&bcs->hw.bas->corrbytes, 0);
2141         bcs->hw.bas->numsub = 0;
2142         spin_lock_init(&ubc->isooutlock);
2143         spin_lock_init(&ubc->isoinlock);
2144         ubc->loststatus = -EINPROGRESS;
2145 }
2146
2147 static void gigaset_freecshw(struct cardstate *cs)
2148 {
2149         /* timers, URBs and rcvbuf are disposed of in disconnect */
2150         kfree(cs->hw.bas->int_in_buf);
2151         kfree(cs->hw.bas);
2152         cs->hw.bas = NULL;
2153 }
2154
2155 static int gigaset_initcshw(struct cardstate *cs)
2156 {
2157         struct bas_cardstate *ucs;
2158
2159         cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
2160         if (!ucs) {
2161                 pr_err("out of memory\n");
2162                 return 0;
2163         }
2164         ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
2165         if (!ucs->int_in_buf) {
2166                 kfree(ucs);
2167                 pr_err("out of memory\n");
2168                 return 0;
2169         }
2170
2171         ucs->urb_cmd_in = NULL;
2172         ucs->urb_cmd_out = NULL;
2173         ucs->rcvbuf = NULL;
2174         ucs->rcvbuf_size = 0;
2175
2176         spin_lock_init(&ucs->lock);
2177         ucs->pending = 0;
2178
2179         ucs->basstate = 0;
2180         init_timer(&ucs->timer_ctrl);
2181         init_timer(&ucs->timer_atrdy);
2182         init_timer(&ucs->timer_cmd_in);
2183         init_waitqueue_head(&ucs->waitqueue);
2184
2185         return 1;
2186 }
2187
2188 /* freeurbs
2189  * unlink and deallocate all URBs unconditionally
2190  * caller must make sure that no commands are still in progress
2191  * parameter:
2192  *      cs      controller state structure
2193  */
2194 static void freeurbs(struct cardstate *cs)
2195 {
2196         struct bas_cardstate *ucs = cs->hw.bas;
2197         struct bas_bc_state *ubc;
2198         int i, j;
2199
2200         gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
2201         for (j = 0; j < BAS_CHANNELS; ++j) {
2202                 ubc = cs->bcs[j].hw.bas;
2203                 for (i = 0; i < BAS_OUTURBS; ++i) {
2204                         usb_kill_urb(ubc->isoouturbs[i].urb);
2205                         usb_free_urb(ubc->isoouturbs[i].urb);
2206                         ubc->isoouturbs[i].urb = NULL;
2207                 }
2208                 for (i = 0; i < BAS_INURBS; ++i) {
2209                         usb_kill_urb(ubc->isoinurbs[i]);
2210                         usb_free_urb(ubc->isoinurbs[i]);
2211                         ubc->isoinurbs[i] = NULL;
2212                 }
2213         }
2214         usb_kill_urb(ucs->urb_int_in);
2215         usb_free_urb(ucs->urb_int_in);
2216         ucs->urb_int_in = NULL;
2217         usb_kill_urb(ucs->urb_cmd_out);
2218         usb_free_urb(ucs->urb_cmd_out);
2219         ucs->urb_cmd_out = NULL;
2220         usb_kill_urb(ucs->urb_cmd_in);
2221         usb_free_urb(ucs->urb_cmd_in);
2222         ucs->urb_cmd_in = NULL;
2223         usb_kill_urb(ucs->urb_ctrl);
2224         usb_free_urb(ucs->urb_ctrl);
2225         ucs->urb_ctrl = NULL;
2226 }
2227
2228 /* gigaset_probe
2229  * This function is called when a new USB device is connected.
2230  * It checks whether the new device is handled by this driver.
2231  */
2232 static int gigaset_probe(struct usb_interface *interface,
2233                          const struct usb_device_id *id)
2234 {
2235         struct usb_host_interface *hostif;
2236         struct usb_device *udev = interface_to_usbdev(interface);
2237         struct cardstate *cs = NULL;
2238         struct bas_cardstate *ucs = NULL;
2239         struct bas_bc_state *ubc;
2240         struct usb_endpoint_descriptor *endpoint;
2241         int i, j;
2242         int rc;
2243
2244         gig_dbg(DEBUG_ANY,
2245                 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2246                 __func__, le16_to_cpu(udev->descriptor.idVendor),
2247                 le16_to_cpu(udev->descriptor.idProduct));
2248
2249         /* set required alternate setting */
2250         hostif = interface->cur_altsetting;
2251         if (hostif->desc.bAlternateSetting != 3) {
2252                 gig_dbg(DEBUG_ANY,
2253                         "%s: wrong alternate setting %d - trying to switch",
2254                         __func__, hostif->desc.bAlternateSetting);
2255                 if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3) < 0) {
2256                         dev_warn(&udev->dev, "usb_set_interface failed, "
2257                                  "device %d interface %d altsetting %d\n",
2258                                  udev->devnum, hostif->desc.bInterfaceNumber,
2259                                  hostif->desc.bAlternateSetting);
2260                         return -ENODEV;
2261                 }
2262                 hostif = interface->cur_altsetting;
2263         }
2264
2265         /* Reject application specific interfaces
2266          */
2267         if (hostif->desc.bInterfaceClass != 255) {
2268                 dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
2269                          __func__, hostif->desc.bInterfaceClass);
2270                 return -ENODEV;
2271         }
2272
2273         dev_info(&udev->dev,
2274                  "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
2275                  __func__, le16_to_cpu(udev->descriptor.idVendor),
2276                  le16_to_cpu(udev->descriptor.idProduct));
2277
2278         /* allocate memory for our device state and intialize it */
2279         cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
2280                             GIGASET_MODULENAME);
2281         if (!cs)
2282                 return -ENODEV;
2283         ucs = cs->hw.bas;
2284
2285         /* save off device structure ptrs for later use */
2286         usb_get_dev(udev);
2287         ucs->udev = udev;
2288         ucs->interface = interface;
2289         cs->dev = &interface->dev;
2290
2291         /* allocate URBs:
2292          * - one for the interrupt pipe
2293          * - three for the different uses of the default control pipe
2294          * - three for each isochronous pipe
2295          */
2296         if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2297             !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2298             !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
2299             !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
2300                 goto allocerr;
2301
2302         for (j = 0; j < BAS_CHANNELS; ++j) {
2303                 ubc = cs->bcs[j].hw.bas;
2304                 for (i = 0; i < BAS_OUTURBS; ++i)
2305                         if (!(ubc->isoouturbs[i].urb =
2306                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2307                                 goto allocerr;
2308                 for (i = 0; i < BAS_INURBS; ++i)
2309                         if (!(ubc->isoinurbs[i] =
2310                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2311                                 goto allocerr;
2312         }
2313
2314         ucs->rcvbuf = NULL;
2315         ucs->rcvbuf_size = 0;
2316
2317         /* Fill the interrupt urb and send it to the core */
2318         endpoint = &hostif->endpoint[0].desc;
2319         usb_fill_int_urb(ucs->urb_int_in, udev,
2320                          usb_rcvintpipe(udev,
2321                                         (endpoint->bEndpointAddress) & 0x0f),
2322                          ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
2323                          endpoint->bInterval);
2324         if ((rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL)) != 0) {
2325                 dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2326                         get_usb_rcmsg(rc));
2327                 goto error;
2328         }
2329
2330         /* tell the device that the driver is ready */
2331         if ((rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0)) != 0)
2332                 goto error;
2333
2334         /* tell common part that the device is ready */
2335         if (startmode == SM_LOCKED)
2336                 cs->mstate = MS_LOCKED;
2337
2338         /* save address of controller structure */
2339         usb_set_intfdata(interface, cs);
2340
2341         if (!gigaset_start(cs))
2342                 goto error;
2343
2344         return 0;
2345
2346 allocerr:
2347         dev_err(cs->dev, "could not allocate URBs\n");
2348 error:
2349         freeurbs(cs);
2350         usb_set_intfdata(interface, NULL);
2351         gigaset_freecs(cs);
2352         return -ENODEV;
2353 }
2354
2355 /* gigaset_disconnect
2356  * This function is called when the Gigaset base is unplugged.
2357  */
2358 static void gigaset_disconnect(struct usb_interface *interface)
2359 {
2360         struct cardstate *cs;
2361         struct bas_cardstate *ucs;
2362         int j;
2363
2364         cs = usb_get_intfdata(interface);
2365
2366         ucs = cs->hw.bas;
2367
2368         dev_info(cs->dev, "disconnecting Gigaset base\n");
2369
2370         /* mark base as not ready, all channels disconnected */
2371         ucs->basstate = 0;
2372
2373         /* tell LL all channels are down */
2374         for (j = 0; j < BAS_CHANNELS; ++j)
2375                 gigaset_bchannel_down(cs->bcs + j);
2376
2377         /* stop driver (common part) */
2378         gigaset_stop(cs);
2379
2380         /* stop timers and URBs, free ressources */
2381         del_timer_sync(&ucs->timer_ctrl);
2382         del_timer_sync(&ucs->timer_atrdy);
2383         del_timer_sync(&ucs->timer_cmd_in);
2384         freeurbs(cs);
2385         usb_set_intfdata(interface, NULL);
2386         kfree(ucs->rcvbuf);
2387         ucs->rcvbuf = NULL;
2388         ucs->rcvbuf_size = 0;
2389         usb_put_dev(ucs->udev);
2390         ucs->interface = NULL;
2391         ucs->udev = NULL;
2392         cs->dev = NULL;
2393         gigaset_freecs(cs);
2394 }
2395
2396 /* gigaset_suspend
2397  * This function is called before the USB connection is suspended.
2398  */
2399 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
2400 {
2401         struct cardstate *cs = usb_get_intfdata(intf);
2402         struct bas_cardstate *ucs = cs->hw.bas;
2403         int rc;
2404
2405         /* set suspend flag; this stops AT command/response traffic */
2406         if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
2407                 gig_dbg(DEBUG_SUSPEND, "already suspended");
2408                 return 0;
2409         }
2410
2411         /* wait a bit for blocking conditions to go away */
2412         rc = wait_event_timeout(ucs->waitqueue,
2413                         !(ucs->basstate &
2414                           (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)),
2415                         BAS_TIMEOUT*HZ/10);
2416         gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
2417
2418         /* check for conditions preventing suspend */
2419         if (ucs->basstate & (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)) {
2420                 dev_warn(cs->dev, "cannot suspend:\n");
2421                 if (ucs->basstate & BS_B1OPEN)
2422                         dev_warn(cs->dev, " B channel 1 open\n");
2423                 if (ucs->basstate & BS_B2OPEN)
2424                         dev_warn(cs->dev, " B channel 2 open\n");
2425                 if (ucs->basstate & BS_ATRDPEND)
2426                         dev_warn(cs->dev, " receiving AT reply\n");
2427                 if (ucs->basstate & BS_ATWRPEND)
2428                         dev_warn(cs->dev, " sending AT command\n");
2429                 update_basstate(ucs, 0, BS_SUSPEND);
2430                 return -EBUSY;
2431         }
2432
2433         /* close AT channel if open */
2434         if (ucs->basstate & BS_ATOPEN) {
2435                 gig_dbg(DEBUG_SUSPEND, "closing AT channel");
2436                 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
2437                 if (rc) {
2438                         update_basstate(ucs, 0, BS_SUSPEND);
2439                         return rc;
2440                 }
2441                 wait_event_timeout(ucs->waitqueue, !ucs->pending,
2442                                    BAS_TIMEOUT*HZ/10);
2443                 /* in case of timeout, proceed anyway */
2444         }
2445
2446         /* kill all URBs and timers that might still be pending */
2447         usb_kill_urb(ucs->urb_ctrl);
2448         usb_kill_urb(ucs->urb_int_in);
2449         del_timer_sync(&ucs->timer_ctrl);
2450
2451         gig_dbg(DEBUG_SUSPEND, "suspend complete");
2452         return 0;
2453 }
2454
2455 /* gigaset_resume
2456  * This function is called after the USB connection has been resumed.
2457  */
2458 static int gigaset_resume(struct usb_interface *intf)
2459 {
2460         struct cardstate *cs = usb_get_intfdata(intf);
2461         struct bas_cardstate *ucs = cs->hw.bas;
2462         int rc;
2463
2464         /* resubmit interrupt URB for spontaneous messages from base */
2465         rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2466         if (rc) {
2467                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
2468                         get_usb_rcmsg(rc));
2469                 return rc;
2470         }
2471
2472         /* clear suspend flag to reallow activity */
2473         update_basstate(ucs, 0, BS_SUSPEND);
2474
2475         gig_dbg(DEBUG_SUSPEND, "resume complete");
2476         return 0;
2477 }
2478
2479 /* gigaset_pre_reset
2480  * This function is called before the USB connection is reset.
2481  */
2482 static int gigaset_pre_reset(struct usb_interface *intf)
2483 {
2484         /* handle just like suspend */
2485         return gigaset_suspend(intf, PMSG_ON);
2486 }
2487
2488 /* gigaset_post_reset
2489  * This function is called after the USB connection has been reset.
2490  */
2491 static int gigaset_post_reset(struct usb_interface *intf)
2492 {
2493         /* FIXME: send HD_DEVICE_INIT_ACK? */
2494
2495         /* resume operations */
2496         return gigaset_resume(intf);
2497 }
2498
2499
2500 static const struct gigaset_ops gigops = {
2501         gigaset_write_cmd,
2502         gigaset_write_room,
2503         gigaset_chars_in_buffer,
2504         gigaset_brkchars,
2505         gigaset_init_bchannel,
2506         gigaset_close_bchannel,
2507         gigaset_initbcshw,
2508         gigaset_freebcshw,
2509         gigaset_reinitbcshw,
2510         gigaset_initcshw,
2511         gigaset_freecshw,
2512         gigaset_set_modem_ctrl,
2513         gigaset_baud_rate,
2514         gigaset_set_line_ctrl,
2515         gigaset_isoc_send_skb,
2516         gigaset_isoc_input,
2517 };
2518
2519 /* bas_gigaset_init
2520  * This function is called after the kernel module is loaded.
2521  */
2522 static int __init bas_gigaset_init(void)
2523 {
2524         int result;
2525
2526         /* allocate memory for our driver state and intialize it */
2527         if ((driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2528                                        GIGASET_MODULENAME, GIGASET_DEVNAME,
2529                                        &gigops, THIS_MODULE)) == NULL)
2530                 goto error;
2531
2532         /* register this driver with the USB subsystem */
2533         result = usb_register(&gigaset_usb_driver);
2534         if (result < 0) {
2535                 pr_err("error %d registering USB driver\n", -result);
2536                 goto error;
2537         }
2538
2539         pr_info(DRIVER_DESC "\n");
2540         return 0;
2541
2542 error:
2543         if (driver)
2544                 gigaset_freedriver(driver);
2545         driver = NULL;
2546         return -1;
2547 }
2548
2549 /* bas_gigaset_exit
2550  * This function is called before the kernel module is unloaded.
2551  */
2552 static void __exit bas_gigaset_exit(void)
2553 {
2554         struct bas_cardstate *ucs;
2555         int i;
2556
2557         gigaset_blockdriver(driver); /* => probe will fail
2558                                       * => no gigaset_start any more
2559                                       */
2560
2561         /* stop all connected devices */
2562         for (i = 0; i < driver->minors; i++) {
2563                 if (gigaset_shutdown(driver->cs + i) < 0)
2564                         continue;               /* no device */
2565                 /* from now on, no isdn callback should be possible */
2566
2567                 /* close all still open channels */
2568                 ucs = driver->cs[i].hw.bas;
2569                 if (ucs->basstate & BS_B1OPEN) {
2570                         gig_dbg(DEBUG_INIT, "closing B1 channel");
2571                         usb_control_msg(ucs->udev,
2572                                         usb_sndctrlpipe(ucs->udev, 0),
2573                                         HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
2574                                         0, 0, NULL, 0, BAS_TIMEOUT);
2575                 }
2576                 if (ucs->basstate & BS_B2OPEN) {
2577                         gig_dbg(DEBUG_INIT, "closing B2 channel");
2578                         usb_control_msg(ucs->udev,
2579                                         usb_sndctrlpipe(ucs->udev, 0),
2580                                         HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
2581                                         0, 0, NULL, 0, BAS_TIMEOUT);
2582                 }
2583                 if (ucs->basstate & BS_ATOPEN) {
2584                         gig_dbg(DEBUG_INIT, "closing AT channel");
2585                         usb_control_msg(ucs->udev,
2586                                         usb_sndctrlpipe(ucs->udev, 0),
2587                                         HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
2588                                         0, 0, NULL, 0, BAS_TIMEOUT);
2589                 }
2590                 ucs->basstate = 0;
2591         }
2592
2593         /* deregister this driver with the USB subsystem */
2594         usb_deregister(&gigaset_usb_driver);
2595         /* this will call the disconnect-callback */
2596         /* from now on, no disconnect/probe callback should be running */
2597
2598         gigaset_freedriver(driver);
2599         driver = NULL;
2600 }
2601
2602
2603 module_init(bas_gigaset_init);
2604 module_exit(bas_gigaset_exit);
2605
2606 MODULE_AUTHOR(DRIVER_AUTHOR);
2607 MODULE_DESCRIPTION(DRIVER_DESC);
2608 MODULE_LICENSE("GPL");