drivers/isdn/gigaset/bas-gigaset.c

   1 /*
   2  * USB driver for Gigaset 307x base via direct USB connection.
   3  *
   4  * Copyright (c) 2001 by Hansjoerg Lipp <hjlipp@web.de>,
   5  *                       Tilman Schmidt <tilman@imap.cc>,
   6  *                       Stefan Eilers.
   7  *
   8  * =====================================================================
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License as
  11  *      published by the Free Software Foundation; either version 2 of
  12  *      the License, or (at your option) any later version.
  13  * =====================================================================
  14  */
  15
  16 #include "gigaset.h"
  17 #include <linux/usb.h>
  18 #include <linux/module.h>
  19 #include <linux/moduleparam.h>
  20
  21 /* Version Information */
  22 #define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
  23 #define DRIVER_DESC "USB Driver for Gigaset 307x"
  24
  25
  26 /* Module parameters */
  27
  28 static int startmode = SM_ISDN;
  29 static int cidmode = 1;
  30
  31 module_param(startmode, int, S_IRUGO);
  32 module_param(cidmode, int, S_IRUGO);
  33 MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
  34 MODULE_PARM_DESC(cidmode, "Call-ID mode");
  35
  36 #define GIGASET_MINORS     1
  37 #define GIGASET_MINOR      16
  38 #define GIGASET_MODULENAME "bas_gigaset"
  39 #define GIGASET_DEVNAME    "ttyGB"
  40
  41 /* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
  42 #define IF_WRITEBUF 264
  43
  44 /* interrupt pipe message size according to ibid. ch. 2.2 */
  45 #define IP_MSGSIZE 3
  46
  47 /* Values for the Gigaset 307x */
  48 #define USB_GIGA_VENDOR_ID      0x0681
  49 #define USB_3070_PRODUCT_ID     0x0001
  50 #define USB_3075_PRODUCT_ID     0x0002
  51 #define USB_SX303_PRODUCT_ID    0x0021
  52 #define USB_SX353_PRODUCT_ID    0x0022
  53
  54 /* table of devices that work with this driver */
  55 static const struct usb_device_id gigaset_table[] = {
  56         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3070_PRODUCT_ID) },
  57         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3075_PRODUCT_ID) },
  58         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX303_PRODUCT_ID) },
  59         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX353_PRODUCT_ID) },
  60         { } /* Terminating entry */
  61 };
  62
  63 MODULE_DEVICE_TABLE(usb, gigaset_table);
  64
  65 /*======================= local function prototypes ==========================*/
  66
  67 /* function called if a new device belonging to this driver is connected */
  68 static int gigaset_probe(struct usb_interface *interface,
  69                          const struct usb_device_id *id);
  70
  71 /* Function will be called if the device is unplugged */
  72 static void gigaset_disconnect(struct usb_interface *interface);
  73
  74 /* functions called before/after suspend */
  75 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
  76 static int gigaset_resume(struct usb_interface *intf);
  77
  78 /* functions called before/after device reset */
  79 static int gigaset_pre_reset(struct usb_interface *intf);
  80 static int gigaset_post_reset(struct usb_interface *intf);
  81
  82 static int atread_submit(struct cardstate *, int);
  83 static void stopurbs(struct bas_bc_state *);
  84 static int req_submit(struct bc_state *, int, int, int);
  85 static int atwrite_submit(struct cardstate *, unsigned char *, int);
  86 static int start_cbsend(struct cardstate *);
  87
  88 /*============================================================================*/
  89
  90 struct bas_cardstate {
  91         struct usb_device       *udev;          /* USB device pointer */
  92         struct usb_interface    *interface;     /* interface for this device */
  93         unsigned char           minor;          /* starting minor number */
  94
  95         struct urb              *urb_ctrl;      /* control pipe default URB */
  96         struct usb_ctrlrequest  dr_ctrl;
  97         struct timer_list       timer_ctrl;     /* control request timeout */
  98         int                     retry_ctrl;
  99
 100         struct timer_list       timer_atrdy;    /* AT command ready timeout */
 101         struct urb              *urb_cmd_out;   /* for sending AT commands */
 102         struct usb_ctrlrequest  dr_cmd_out;
 103         int                     retry_cmd_out;
 104
 105         struct urb              *urb_cmd_in;    /* for receiving AT replies */
 106         struct usb_ctrlrequest  dr_cmd_in;
 107         struct timer_list       timer_cmd_in;   /* receive request timeout */
 108         unsigned char           *rcvbuf;        /* AT reply receive buffer */
 109
 110         struct urb              *urb_int_in;    /* URB for interrupt pipe */
 111         unsigned char           *int_in_buf;
 112
 113         spinlock_t              lock;           /* locks all following */
 114         int                     basstate;       /* bitmap (BS_*) */
 115         int                     pending;        /* uncompleted base request */
 116         wait_queue_head_t       waitqueue;
 117         int                     rcvbuf_size;    /* size of AT receive buffer */
 118                                                 /* 0: no receive in progress */
 119         int                     retry_cmd_in;   /* receive req retry count */
 120 };
 121
 122 /* status of direct USB connection to 307x base (bits in basstate) */
 123 #define BS_ATOPEN       0x001   /* AT channel open */
 124 #define BS_B1OPEN       0x002   /* B channel 1 open */
 125 #define BS_B2OPEN       0x004   /* B channel 2 open */
 126 #define BS_ATREADY      0x008   /* base ready for AT command */
 127 #define BS_INIT         0x010   /* base has signalled INIT_OK */
 128 #define BS_ATTIMER      0x020   /* waiting for HD_READY_SEND_ATDATA */
 129 #define BS_ATRDPEND     0x040   /* urb_cmd_in in use */
 130 #define BS_ATWRPEND     0x080   /* urb_cmd_out in use */
 131 #define BS_SUSPEND      0x100   /* USB port suspended */
 132 #define BS_RESETTING    0x200   /* waiting for HD_RESET_INTERRUPT_PIPE_ACK */
 133
 134
 135 static struct gigaset_driver *driver;
 136
 137 /* usb specific object needed to register this driver with the usb subsystem */
 138 static struct usb_driver gigaset_usb_driver = {
 139         .name =         GIGASET_MODULENAME,
 140         .probe =        gigaset_probe,
 141         .disconnect =   gigaset_disconnect,
 142         .id_table =     gigaset_table,
 143         .suspend =      gigaset_suspend,
 144         .resume =       gigaset_resume,
 145         .reset_resume = gigaset_post_reset,
 146         .pre_reset =    gigaset_pre_reset,
 147         .post_reset =   gigaset_post_reset,
 148 };
 149
 150 /* get message text for usb_submit_urb return code
 151  */
 152 static char *get_usb_rcmsg(int rc)
 153 {
 154         static char unkmsg[28];
 155
 156         switch (rc) {
 157         case 0:
 158                 return "success";
 159         case -ENOMEM:
 160                 return "out of memory";
 161         case -ENODEV:
 162                 return "device not present";
 163         case -ENOENT:
 164                 return "endpoint not present";
 165         case -ENXIO:
 166                 return "URB type not supported";
 167         case -EINVAL:
 168                 return "invalid argument";
 169         case -EAGAIN:
 170                 return "start frame too early or too much scheduled";
 171         case -EFBIG:
 172                 return "too many isochronous frames requested";
 173         case -EPIPE:
 174                 return "endpoint stalled";
 175         case -EMSGSIZE:
 176                 return "invalid packet size";
 177         case -ENOSPC:
 178                 return "would overcommit USB bandwidth";
 179         case -ESHUTDOWN:
 180                 return "device shut down";
 181         case -EPERM:
 182                 return "reject flag set";
 183         case -EHOSTUNREACH:
 184                 return "device suspended";
 185         default:
 186                 snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
 187                 return unkmsg;
 188         }
 189 }
 190
 191 /* get message text for USB status code
 192  */
 193 static char *get_usb_statmsg(int status)
 194 {
 195         static char unkmsg[28];
 196
 197         switch (status) {
 198         case 0:
 199                 return "success";
 200         case -ENOENT:
 201                 return "unlinked (sync)";
 202         case -EINPROGRESS:
 203                 return "pending";
 204         case -EPROTO:
 205                 return "bit stuffing error, timeout, or unknown USB error";
 206         case -EILSEQ:
 207                 return "CRC mismatch, timeout, or unknown USB error";
 208         case -ETIME:
 209                 return "timed out";
 210         case -EPIPE:
 211                 return "endpoint stalled";
 212         case -ECOMM:
 213                 return "IN buffer overrun";
 214         case -ENOSR:
 215                 return "OUT buffer underrun";
 216         case -EOVERFLOW:
 217                 return "too much data";
 218         case -EREMOTEIO:
 219                 return "short packet detected";
 220         case -ENODEV:
 221                 return "device removed";
 222         case -EXDEV:
 223                 return "partial isochronous transfer";
 224         case -EINVAL:
 225                 return "invalid argument";
 226         case -ECONNRESET:
 227                 return "unlinked (async)";
 228         case -ESHUTDOWN:
 229                 return "device shut down";
 230         default:
 231                 snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
 232                 return unkmsg;
 233         }
 234 }
 235
 236 /* usb_pipetype_str
 237  * retrieve string representation of USB pipe type
 238  */
 239 static inline char *usb_pipetype_str(int pipe)
 240 {
 241         if (usb_pipeisoc(pipe))
 242                 return "Isoc";
 243         if (usb_pipeint(pipe))
 244                 return "Int";
 245         if (usb_pipecontrol(pipe))
 246                 return "Ctrl";
 247         if (usb_pipebulk(pipe))
 248                 return "Bulk";
 249         return "?";
 250 }
 251
 252 /* dump_urb
 253  * write content of URB to syslog for debugging
 254  */
 255 static inline void dump_urb(enum debuglevel level, const char *tag,
 256                             struct urb *urb)
 257 {
 258 #ifdef CONFIG_GIGASET_DEBUG
 259         int i;
 260         gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
 261         if (urb) {
 262                 gig_dbg(level,
 263                         "  dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
 264                         "hcpriv=0x%08lx, transfer_flags=0x%x,",
 265                         (unsigned long) urb->dev,
 266                         usb_pipetype_str(urb->pipe),
 267                         usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
 268                         usb_pipein(urb->pipe) ? "in" : "out",
 269                         (unsigned long) urb->hcpriv,
 270                         urb->transfer_flags);
 271                 gig_dbg(level,
 272                         "  transfer_buffer=0x%08lx[%d], actual_length=%d, "
 273                         "setup_packet=0x%08lx,",
 274                         (unsigned long) urb->transfer_buffer,
 275                         urb->transfer_buffer_length, urb->actual_length,
 276                         (unsigned long) urb->setup_packet);
 277                 gig_dbg(level,
 278                         "  start_frame=%d, number_of_packets=%d, interval=%d, "
 279                         "error_count=%d,",
 280                         urb->start_frame, urb->number_of_packets, urb->interval,
 281                         urb->error_count);
 282                 gig_dbg(level,
 283                         "  context=0x%08lx, complete=0x%08lx, "
 284                         "iso_frame_desc[]={",
 285                         (unsigned long) urb->context,
 286                         (unsigned long) urb->complete);
 287                 for (i = 0; i < urb->number_of_packets; i++) {
 288                         struct usb_iso_packet_descriptor *pifd
 289                                 = &urb->iso_frame_desc[i];
 290                         gig_dbg(level,
 291                                 "    {offset=%u, length=%u, actual_length=%u, "
 292                                 "status=%u}",
 293                                 pifd->offset, pifd->length, pifd->actual_length,
 294                                 pifd->status);
 295                 }
 296         }
 297         gig_dbg(level, "}}");
 298 #endif
 299 }
 300
 301 /* read/set modem control bits etc. (m10x only) */
 302 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
 303                                   unsigned new_state)
 304 {
 305         return -EINVAL;
 306 }
 307
 308 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
 309 {
 310         return -EINVAL;
 311 }
 312
 313 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
 314 {
 315         return -EINVAL;
 316 }
 317
 318 /* set/clear bits in base connection state, return previous state
 319  */
 320 static inline int update_basstate(struct bas_cardstate *ucs,
 321                                   int set, int clear)
 322 {
 323         unsigned long flags;
 324         int state;
 325
 326         spin_lock_irqsave(&ucs->lock, flags);
 327         state = ucs->basstate;
 328         ucs->basstate = (state & ~clear) | set;
 329         spin_unlock_irqrestore(&ucs->lock, flags);
 330         return state;
 331 }
 332
 333 /* error_hangup
 334  * hang up any existing connection because of an unrecoverable error
 335  * This function may be called from any context and takes care of scheduling
 336  * the necessary actions for execution outside of interrupt context.
 337  * cs->lock must not be held.
 338  * argument:
 339  *      B channel control structure
 340  */
 341 static inline void error_hangup(struct bc_state *bcs)
 342 {
 343         struct cardstate *cs = bcs->cs;
 344
 345         gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL);
 346         gigaset_schedule_event(cs);
 347 }
 348
 349 /* error_reset
 350  * reset Gigaset device because of an unrecoverable error
 351  * This function may be called from any context, and takes care of
 352  * scheduling the necessary actions for execution outside of interrupt context.
 353  * cs->lock must not be held.
 354  * argument:
 355  *      controller state structure
 356  */
 357 static inline void error_reset(struct cardstate *cs)
 358 {
 359         /* reset interrupt pipe to recover (ignore errors) */
 360         update_basstate(cs->hw.bas, BS_RESETTING, 0);
 361         req_submit(cs->bcs, HD_RESET_INTERRUPT_PIPE, 0, BAS_TIMEOUT);
 362 }
 363
 364 /* check_pending
 365  * check for completion of pending control request
 366  * parameter:
 367  *      ucs     hardware specific controller state structure
 368  */
 369 static void check_pending(struct bas_cardstate *ucs)
 370 {
 371         unsigned long flags;
 372
 373         spin_lock_irqsave(&ucs->lock, flags);
 374         switch (ucs->pending) {
 375         case 0:
 376                 break;
 377         case HD_OPEN_ATCHANNEL:
 378                 if (ucs->basstate & BS_ATOPEN)
 379                         ucs->pending = 0;
 380                 break;
 381         case HD_OPEN_B1CHANNEL:
 382                 if (ucs->basstate & BS_B1OPEN)
 383                         ucs->pending = 0;
 384                 break;
 385         case HD_OPEN_B2CHANNEL:
 386                 if (ucs->basstate & BS_B2OPEN)
 387                         ucs->pending = 0;
 388                 break;
 389         case HD_CLOSE_ATCHANNEL:
 390                 if (!(ucs->basstate & BS_ATOPEN))
 391                         ucs->pending = 0;
 392                 break;
 393         case HD_CLOSE_B1CHANNEL:
 394                 if (!(ucs->basstate & BS_B1OPEN))
 395                         ucs->pending = 0;
 396                 break;
 397         case HD_CLOSE_B2CHANNEL:
 398                 if (!(ucs->basstate & BS_B2OPEN))
 399                         ucs->pending = 0;
 400                 break;
 401         case HD_DEVICE_INIT_ACK:                /* no reply expected */
 402                 ucs->pending = 0;
 403                 break;
 404         case HD_RESET_INTERRUPT_PIPE:
 405                 if (!(ucs->basstate & BS_RESETTING))
 406                         ucs->pending = 0;
 407                 break;
 408         /*
 409          * HD_READ_ATMESSAGE and HD_WRITE_ATMESSAGE are handled separately
 410          * and should never end up here
 411          */
 412         default:
 413                 dev_warn(&ucs->interface->dev,
 414                          "unknown pending request 0x%02x cleared\n",
 415                          ucs->pending);
 416                 ucs->pending = 0;
 417         }
 418
 419         if (!ucs->pending)
 420                 del_timer(&ucs->timer_ctrl);
 421
 422         spin_unlock_irqrestore(&ucs->lock, flags);
 423 }
 424
 425 /* cmd_in_timeout
 426  * timeout routine for command input request
 427  * argument:
 428  *      controller state structure
 429  */
 430 static void cmd_in_timeout(unsigned long data)
 431 {
 432         struct cardstate *cs = (struct cardstate *) data;
 433         struct bas_cardstate *ucs = cs->hw.bas;
 434         int rc;
 435
 436         if (!ucs->rcvbuf_size) {
 437                 gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
 438                 return;
 439         }
 440
 441         if (ucs->retry_cmd_in++ < BAS_RETRY) {
 442                 dev_notice(cs->dev, "control read: timeout, retry %d\n",
 443                            ucs->retry_cmd_in);
 444                 rc = atread_submit(cs, BAS_TIMEOUT);
 445                 if (rc >= 0 || rc == -ENODEV)
 446                         /* resubmitted or disconnected */
 447                         /* - bypass regular exit block */
 448                         return;
 449         } else {
 450                 dev_err(cs->dev,
 451                         "control read: timeout, giving up after %d tries\n",
 452                         ucs->retry_cmd_in);
 453         }
 454         kfree(ucs->rcvbuf);
 455         ucs->rcvbuf = NULL;
 456         ucs->rcvbuf_size = 0;
 457         error_reset(cs);
 458 }
 459
 460 /* read_ctrl_callback
 461  * USB completion handler for control pipe input
 462  * called by the USB subsystem in interrupt context
 463  * parameter:
 464  *      urb     USB request block
 465  *              urb->context = inbuf structure for controller state
 466  */
 467 static void read_ctrl_callback(struct urb *urb)
 468 {
 469         struct inbuf_t *inbuf = urb->context;
 470         struct cardstate *cs = inbuf->cs;
 471         struct bas_cardstate *ucs = cs->hw.bas;
 472         int status = urb->status;
 473         int have_data = 0;
 474         unsigned numbytes;
 475         int rc;
 476
 477         update_basstate(ucs, 0, BS_ATRDPEND);
 478         wake_up(&ucs->waitqueue);
 479
 480         if (!ucs->rcvbuf_size) {
 481                 dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
 482                 return;
 483         }
 484
 485         del_timer(&ucs->timer_cmd_in);
 486
 487         switch (status) {
 488         case 0:                         /* normal completion */
 489                 numbytes = urb->actual_length;
 490                 if (unlikely(numbytes != ucs->rcvbuf_size)) {
 491                         dev_warn(cs->dev,
 492                                "control read: received %d chars, expected %d\n",
 493                                  numbytes, ucs->rcvbuf_size);
 494                         if (numbytes > ucs->rcvbuf_size)
 495                                 numbytes = ucs->rcvbuf_size;
 496                 }
 497
 498                 /* copy received bytes to inbuf */
 499                 have_data = gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes);
 500
 501                 if (unlikely(numbytes < ucs->rcvbuf_size)) {
 502                         /* incomplete - resubmit for remaining bytes */
 503                         ucs->rcvbuf_size -= numbytes;
 504                         ucs->retry_cmd_in = 0;
 505                         rc = atread_submit(cs, BAS_TIMEOUT);
 506                         if (rc >= 0 || rc == -ENODEV)
 507                                 /* resubmitted or disconnected */
 508                                 /* - bypass regular exit block */
 509                                 return;
 510                         error_reset(cs);
 511                 }
 512                 break;
 513
 514         case -ENOENT:                   /* cancelled */
 515         case -ECONNRESET:               /* cancelled (async) */
 516         case -EINPROGRESS:              /* pending */
 517         case -ENODEV:                   /* device removed */
 518         case -ESHUTDOWN:                /* device shut down */
 519                 /* no action necessary */
 520                 gig_dbg(DEBUG_USBREQ, "%s: %s",
 521                         __func__, get_usb_statmsg(status));
 522                 break;
 523
 524         default:                        /* severe trouble */
 525                 dev_warn(cs->dev, "control read: %s\n",
 526                          get_usb_statmsg(status));
 527                 if (ucs->retry_cmd_in++ < BAS_RETRY) {
 528                         dev_notice(cs->dev, "control read: retry %d\n",
 529                                    ucs->retry_cmd_in);
 530                         rc = atread_submit(cs, BAS_TIMEOUT);
 531                         if (rc >= 0 || rc == -ENODEV)
 532                                 /* resubmitted or disconnected */
 533                                 /* - bypass regular exit block */
 534                                 return;
 535                 } else {
 536                         dev_err(cs->dev,
 537                                 "control read: giving up after %d tries\n",
 538                                 ucs->retry_cmd_in);
 539                 }
 540                 error_reset(cs);
 541         }
 542
 543         kfree(ucs->rcvbuf);
 544         ucs->rcvbuf = NULL;
 545         ucs->rcvbuf_size = 0;
 546         if (have_data) {
 547                 gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
 548                 gigaset_schedule_event(cs);
 549         }
 550 }
 551
 552 /* atread_submit
 553  * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
 554  * parameters:
 555  *      cs      controller state structure
 556  *      timeout timeout in 1/10 sec., 0: none
 557  * return value:
 558  *      0 on success
 559  *      -EBUSY if another request is pending
 560  *      any URB submission error code
 561  */
 562 static int atread_submit(struct cardstate *cs, int timeout)
 563 {
 564         struct bas_cardstate *ucs = cs->hw.bas;
 565         int basstate;
 566         int ret;
 567
 568         gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
 569                 ucs->rcvbuf_size);
 570
 571         basstate = update_basstate(ucs, BS_ATRDPEND, 0);
 572         if (basstate & BS_ATRDPEND) {
 573                 dev_err(cs->dev,
 574                         "could not submit HD_READ_ATMESSAGE: URB busy\n");
 575                 return -EBUSY;
 576         }
 577
 578         if (basstate & BS_SUSPEND) {
 579                 dev_notice(cs->dev,
 580                            "HD_READ_ATMESSAGE not submitted, "
 581                            "suspend in progress\n");
 582                 update_basstate(ucs, 0, BS_ATRDPEND);
 583                 /* treat like disconnect */
 584                 return -ENODEV;
 585         }
 586
 587         ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
 588         ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
 589         ucs->dr_cmd_in.wValue = 0;
 590         ucs->dr_cmd_in.wIndex = 0;
 591         ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
 592         usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
 593                              usb_rcvctrlpipe(ucs->udev, 0),
 594                              (unsigned char *) &ucs->dr_cmd_in,
 595                              ucs->rcvbuf, ucs->rcvbuf_size,
 596                              read_ctrl_callback, cs->inbuf);
 597
 598         ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC);
 599         if (ret != 0) {
 600                 update_basstate(ucs, 0, BS_ATRDPEND);
 601                 dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
 602                         get_usb_rcmsg(ret));
 603                 return ret;
 604         }
 605
 606         if (timeout > 0) {
 607                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
 608                 ucs->timer_cmd_in.expires = jiffies + timeout * HZ / 10;
 609                 ucs->timer_cmd_in.data = (unsigned long) cs;
 610                 ucs->timer_cmd_in.function = cmd_in_timeout;
 611                 add_timer(&ucs->timer_cmd_in);
 612         }
 613         return 0;
 614 }
 615
 616 /* read_int_callback
 617  * USB completion handler for interrupt pipe input
 618  * called by the USB subsystem in interrupt context
 619  * parameter:
 620  *      urb     USB request block
 621  *              urb->context = controller state structure
 622  */
 623 static void read_int_callback(struct urb *urb)
 624 {
 625         struct cardstate *cs = urb->context;
 626         struct bas_cardstate *ucs = cs->hw.bas;
 627         struct bc_state *bcs;
 628         int status = urb->status;
 629         unsigned long flags;
 630         int rc;
 631         unsigned l;
 632         int channel;
 633
 634         switch (status) {
 635         case 0:                 /* success */
 636                 break;
 637         case -ENOENT:                   /* cancelled */
 638         case -ECONNRESET:               /* cancelled (async) */
 639         case -EINPROGRESS:              /* pending */
 640                 /* ignore silently */
 641                 gig_dbg(DEBUG_USBREQ, "%s: %s",
 642                         __func__, get_usb_statmsg(status));
 643                 return;
 644         case -ENODEV:                   /* device removed */
 645         case -ESHUTDOWN:                /* device shut down */
 646                 gig_dbg(DEBUG_USBREQ, "%s: device disconnected", __func__);
 647                 return;
 648         default:                /* severe trouble */
 649                 dev_warn(cs->dev, "interrupt read: %s\n",
 650                          get_usb_statmsg(status));
 651                 goto resubmit;
 652         }
 653
 654         /* drop incomplete packets even if the missing bytes wouldn't matter */
 655         if (unlikely(urb->actual_length < IP_MSGSIZE)) {
 656                 dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
 657                          urb->actual_length);
 658                 goto resubmit;
 659         }
 660
 661         l = (unsigned) ucs->int_in_buf[1] +
 662             (((unsigned) ucs->int_in_buf[2]) << 8);
 663
 664         gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
 665                 urb->actual_length, (int)ucs->int_in_buf[0], l,
 666                 (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
 667
 668         channel = 0;
 669
 670         switch (ucs->int_in_buf[0]) {
 671         case HD_DEVICE_INIT_OK:
 672                 update_basstate(ucs, BS_INIT, 0);
 673                 break;
 674
 675         case HD_READY_SEND_ATDATA:
 676                 del_timer(&ucs->timer_atrdy);
 677                 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
 678                 start_cbsend(cs);
 679                 break;
 680
 681         case HD_OPEN_B2CHANNEL_ACK:
 682                 ++channel;
 683         case HD_OPEN_B1CHANNEL_ACK:
 684                 bcs = cs->bcs + channel;
 685                 update_basstate(ucs, BS_B1OPEN << channel, 0);
 686                 gigaset_bchannel_up(bcs);
 687                 break;
 688
 689         case HD_OPEN_ATCHANNEL_ACK:
 690                 update_basstate(ucs, BS_ATOPEN, 0);
 691                 start_cbsend(cs);
 692                 break;
 693
 694         case HD_CLOSE_B2CHANNEL_ACK:
 695                 ++channel;
 696         case HD_CLOSE_B1CHANNEL_ACK:
 697                 bcs = cs->bcs + channel;
 698                 update_basstate(ucs, 0, BS_B1OPEN << channel);
 699                 stopurbs(bcs->hw.bas);
 700                 gigaset_bchannel_down(bcs);
 701                 break;
 702
 703         case HD_CLOSE_ATCHANNEL_ACK:
 704                 update_basstate(ucs, 0, BS_ATOPEN);
 705                 break;
 706
 707         case HD_B2_FLOW_CONTROL:
 708                 ++channel;
 709         case HD_B1_FLOW_CONTROL:
 710                 bcs = cs->bcs + channel;
 711                 atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
 712                            &bcs->hw.bas->corrbytes);
 713                 gig_dbg(DEBUG_ISO,
 714                         "Flow control (channel %d, sub %d): 0x%02x => %d",
 715                         channel, bcs->hw.bas->numsub, l,
 716                         atomic_read(&bcs->hw.bas->corrbytes));
 717                 break;
 718
 719         case HD_RECEIVEATDATA_ACK:      /* AT response ready to be received */
 720                 if (!l) {
 721                         dev_warn(cs->dev,
 722                                 "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
 723                         break;
 724                 }
 725                 spin_lock_irqsave(&cs->lock, flags);
 726                 if (ucs->rcvbuf_size) {
 727                         /* throw away previous buffer - we have no queue */
 728                         dev_err(cs->dev,
 729                                 "receive AT data overrun, %d bytes lost\n",
 730                                 ucs->rcvbuf_size);
 731                         kfree(ucs->rcvbuf);
 732                         ucs->rcvbuf_size = 0;
 733                 }
 734                 ucs->rcvbuf = kmalloc(l, GFP_ATOMIC);
 735                 if (ucs->rcvbuf == NULL) {
 736                         spin_unlock_irqrestore(&cs->lock, flags);
 737                         dev_err(cs->dev, "out of memory receiving AT data\n");
 738                         error_reset(cs);
 739                         break;
 740                 }
 741                 ucs->rcvbuf_size = l;
 742                 ucs->retry_cmd_in = 0;
 743                 rc = atread_submit(cs, BAS_TIMEOUT);
 744                 if (rc < 0) {
 745                         kfree(ucs->rcvbuf);
 746                         ucs->rcvbuf = NULL;
 747                         ucs->rcvbuf_size = 0;
 748                         if (rc != -ENODEV) {
 749                                 spin_unlock_irqrestore(&cs->lock, flags);
 750                                 error_reset(cs);
 751                                 break;
 752                         }
 753                 }
 754                 spin_unlock_irqrestore(&cs->lock, flags);
 755                 break;
 756
 757         case HD_RESET_INTERRUPT_PIPE_ACK:
 758                 update_basstate(ucs, 0, BS_RESETTING);
 759                 dev_notice(cs->dev, "interrupt pipe reset\n");
 760                 break;
 761
 762         case HD_SUSPEND_END:
 763                 gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
 764                 break;
 765
 766         default:
 767                 dev_warn(cs->dev,
 768                          "unknown Gigaset signal 0x%02x (%u) ignored\n",
 769                          (int) ucs->int_in_buf[0], l);
 770         }
 771
 772         check_pending(ucs);
 773         wake_up(&ucs->waitqueue);
 774
 775 resubmit:
 776         rc = usb_submit_urb(urb, GFP_ATOMIC);
 777         if (unlikely(rc != 0 && rc != -ENODEV)) {
 778                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
 779                         get_usb_rcmsg(rc));
 780                 error_reset(cs);
 781         }
 782 }
 783
 784 /* read_iso_callback
 785  * USB completion handler for B channel isochronous input
 786  * called by the USB subsystem in interrupt context
 787  * parameter:
 788  *      urb     USB request block of completed request
 789  *              urb->context = bc_state structure
 790  */
 791 static void read_iso_callback(struct urb *urb)
 792 {
 793         struct bc_state *bcs;
 794         struct bas_bc_state *ubc;
 795         int status = urb->status;
 796         unsigned long flags;
 797         int i, rc;
 798
 799         /* status codes not worth bothering the tasklet with */
 800         if (unlikely(status == -ENOENT ||
 801                      status == -ECONNRESET ||
 802                      status == -EINPROGRESS ||
 803                      status == -ENODEV ||
 804                      status == -ESHUTDOWN)) {
 805                 gig_dbg(DEBUG_ISO, "%s: %s",
 806                         __func__, get_usb_statmsg(status));
 807                 return;
 808         }
 809
 810         bcs = urb->context;
 811         ubc = bcs->hw.bas;
 812
 813         spin_lock_irqsave(&ubc->isoinlock, flags);
 814         if (likely(ubc->isoindone == NULL)) {
 815                 /* pass URB to tasklet */
 816                 ubc->isoindone = urb;
 817                 ubc->isoinstatus = status;
 818                 tasklet_hi_schedule(&ubc->rcvd_tasklet);
 819         } else {
 820                 /* tasklet still busy, drop data and resubmit URB */
 821                 ubc->loststatus = status;
 822                 for (i = 0; i < BAS_NUMFRAMES; i++) {
 823                         ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
 824                         if (unlikely(urb->iso_frame_desc[i].status != 0 &&
 825                                      urb->iso_frame_desc[i].status !=
 826                                                                 -EINPROGRESS))
 827                                 ubc->loststatus = urb->iso_frame_desc[i].status;
 828                         urb->iso_frame_desc[i].status = 0;
 829                         urb->iso_frame_desc[i].actual_length = 0;
 830                 }
 831                 if (likely(ubc->running)) {
 832                         /* urb->dev is clobbered by USB subsystem */
 833                         urb->dev = bcs->cs->hw.bas->udev;
 834                         urb->transfer_flags = URB_ISO_ASAP;
 835                         urb->number_of_packets = BAS_NUMFRAMES;
 836                         gig_dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit",
 837                                 __func__);
 838                         rc = usb_submit_urb(urb, GFP_ATOMIC);
 839                         if (unlikely(rc != 0 && rc != -ENODEV)) {
 840                                 dev_err(bcs->cs->dev,
 841                                         "could not resubmit isochronous read "
 842                                         "URB: %s\n", get_usb_rcmsg(rc));
 843                                 dump_urb(DEBUG_ISO, "isoc read", urb);
 844                                 error_hangup(bcs);
 845                         }
 846                 }
 847         }
 848         spin_unlock_irqrestore(&ubc->isoinlock, flags);
 849 }
 850
 851 /* write_iso_callback
 852  * USB completion handler for B channel isochronous output
 853  * called by the USB subsystem in interrupt context
 854  * parameter:
 855  *      urb     USB request block of completed request
 856  *              urb->context = isow_urbctx_t structure
 857  */
 858 static void write_iso_callback(struct urb *urb)
 859 {
 860         struct isow_urbctx_t *ucx;
 861         struct bas_bc_state *ubc;
 862         int status = urb->status;
 863         unsigned long flags;
 864
 865         /* status codes not worth bothering the tasklet with */
 866         if (unlikely(status == -ENOENT ||
 867                      status == -ECONNRESET ||
 868                      status == -EINPROGRESS ||
 869                      status == -ENODEV ||
 870                      status == -ESHUTDOWN)) {
 871                 gig_dbg(DEBUG_ISO, "%s: %s",
 872                         __func__, get_usb_statmsg(status));
 873                 return;
 874         }
 875
 876         /* pass URB context to tasklet */
 877         ucx = urb->context;
 878         ubc = ucx->bcs->hw.bas;
 879         ucx->status = status;
 880
 881         spin_lock_irqsave(&ubc->isooutlock, flags);
 882         ubc->isooutovfl = ubc->isooutdone;
 883         ubc->isooutdone = ucx;
 884         spin_unlock_irqrestore(&ubc->isooutlock, flags);
 885         tasklet_hi_schedule(&ubc->sent_tasklet);
 886 }
 887
 888 /* starturbs
 889  * prepare and submit USB request blocks for isochronous input and output
 890  * argument:
 891  *      B channel control structure
 892  * return value:
 893  *      0 on success
 894  *      < 0 on error (no URBs submitted)
 895  */
 896 static int starturbs(struct bc_state *bcs)
 897 {
 898         struct bas_bc_state *ubc = bcs->hw.bas;
 899         struct urb *urb;
 900         int j, k;
 901         int rc;
 902
 903         /* initialize L2 reception */
 904         if (bcs->proto2 == L2_HDLC)
 905                 bcs->inputstate |= INS_flag_hunt;
 906
 907         /* submit all isochronous input URBs */
 908         ubc->running = 1;
 909         for (k = 0; k < BAS_INURBS; k++) {
 910                 urb = ubc->isoinurbs[k];
 911                 if (!urb) {
 912                         rc = -EFAULT;
 913                         goto error;
 914                 }
 915
 916                 urb->dev = bcs->cs->hw.bas->udev;
 917                 urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
 918                 urb->transfer_flags = URB_ISO_ASAP;
 919                 urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
 920                 urb->transfer_buffer_length = BAS_INBUFSIZE;
 921                 urb->number_of_packets = BAS_NUMFRAMES;
 922                 urb->interval = BAS_FRAMETIME;
 923                 urb->complete = read_iso_callback;
 924                 urb->context = bcs;
 925                 for (j = 0; j < BAS_NUMFRAMES; j++) {
 926                         urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
 927                         urb->iso_frame_desc[j].length = BAS_MAXFRAME;
 928                         urb->iso_frame_desc[j].status = 0;
 929                         urb->iso_frame_desc[j].actual_length = 0;
 930                 }
 931
 932                 dump_urb(DEBUG_ISO, "Initial isoc read", urb);
 933                 rc = usb_submit_urb(urb, GFP_ATOMIC);
 934                 if (rc != 0)
 935                         goto error;
 936         }
 937
 938         /* initialize L2 transmission */
 939         gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
 940
 941         /* set up isochronous output URBs for flag idling */
 942         for (k = 0; k < BAS_OUTURBS; ++k) {
 943                 urb = ubc->isoouturbs[k].urb;
 944                 if (!urb) {
 945                         rc = -EFAULT;
 946                         goto error;
 947                 }
 948                 urb->dev = bcs->cs->hw.bas->udev;
 949                 urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
 950                 urb->transfer_flags = URB_ISO_ASAP;
 951                 urb->transfer_buffer = ubc->isooutbuf->data;
 952                 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
 953                 urb->number_of_packets = BAS_NUMFRAMES;
 954                 urb->interval = BAS_FRAMETIME;
 955                 urb->complete = write_iso_callback;
 956                 urb->context = &ubc->isoouturbs[k];
 957                 for (j = 0; j < BAS_NUMFRAMES; ++j) {
 958                         urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
 959                         urb->iso_frame_desc[j].length = BAS_NORMFRAME;
 960                         urb->iso_frame_desc[j].status = 0;
 961                         urb->iso_frame_desc[j].actual_length = 0;
 962                 }
 963                 ubc->isoouturbs[k].limit = -1;
 964         }
 965
 966         /* keep one URB free, submit the others */
 967         for (k = 0; k < BAS_OUTURBS-1; ++k) {
 968                 dump_urb(DEBUG_ISO, "Initial isoc write", urb);
 969                 rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
 970                 if (rc != 0)
 971                         goto error;
 972         }
 973         dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
 974         ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS-1];
 975         ubc->isooutdone = ubc->isooutovfl = NULL;
 976         return 0;
 977  error:
 978         stopurbs(ubc);
 979         return rc;
 980 }
 981
 982 /* stopurbs
 983  * cancel the USB request blocks for isochronous input and output
 984  * errors are silently ignored
 985  * argument:
 986  *      B channel control structure
 987  */
 988 static void stopurbs(struct bas_bc_state *ubc)
 989 {
 990         int k, rc;
 991
 992         ubc->running = 0;
 993
 994         for (k = 0; k < BAS_INURBS; ++k) {
 995                 rc = usb_unlink_urb(ubc->isoinurbs[k]);
 996                 gig_dbg(DEBUG_ISO,
 997                         "%s: isoc input URB %d unlinked, result = %s",
 998                         __func__, k, get_usb_rcmsg(rc));
 999         }
1000
1001         for (k = 0; k < BAS_OUTURBS; ++k) {
1002                 rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
1003                 gig_dbg(DEBUG_ISO,
1004                         "%s: isoc output URB %d unlinked, result = %s",
1005                         __func__, k, get_usb_rcmsg(rc));
1006         }
1007 }
1008
1009 /* Isochronous Write - Bottom Half */
1010 /* =============================== */
1011
1012 /* submit_iso_write_urb
1013  * fill and submit the next isochronous write URB
1014  * parameters:
1015  *      ucx     context structure containing URB
1016  * return value:
1017  *      number of frames submitted in URB
1018  *      0 if URB not submitted because no data available (isooutbuf busy)
1019  *      error code < 0 on error
1020  */
1021 static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
1022 {
1023         struct urb *urb = ucx->urb;
1024         struct bas_bc_state *ubc = ucx->bcs->hw.bas;
1025         struct usb_iso_packet_descriptor *ifd;
1026         int corrbytes, nframe, rc;
1027
1028         /* urb->dev is clobbered by USB subsystem */
1029         urb->dev = ucx->bcs->cs->hw.bas->udev;
1030         urb->transfer_flags = URB_ISO_ASAP;
1031         urb->transfer_buffer = ubc->isooutbuf->data;
1032         urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1033
1034         for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
1035                 ifd = &urb->iso_frame_desc[nframe];
1036
1037                 /* compute frame length according to flow control */
1038                 ifd->length = BAS_NORMFRAME;
1039                 corrbytes = atomic_read(&ubc->corrbytes);
1040                 if (corrbytes != 0) {
1041                         gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
1042                                 __func__, corrbytes);
1043                         if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
1044                                 corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
1045                         else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
1046                                 corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
1047                         ifd->length += corrbytes;
1048                         atomic_add(-corrbytes, &ubc->corrbytes);
1049                 }
1050
1051                 /* retrieve block of data to send */
1052                 rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
1053                 if (rc < 0) {
1054                         if (rc == -EBUSY) {
1055                                 gig_dbg(DEBUG_ISO,
1056                                         "%s: buffer busy at frame %d",
1057                                         __func__, nframe);
1058                                 /* tasklet will be restarted from
1059                                    gigaset_isoc_send_skb() */
1060                         } else {
1061                                 dev_err(ucx->bcs->cs->dev,
1062                                         "%s: buffer error %d at frame %d\n",
1063                                         __func__, rc, nframe);
1064                                 return rc;
1065                         }
1066                         break;
1067                 }
1068                 ifd->offset = rc;
1069                 ucx->limit = ubc->isooutbuf->nextread;
1070                 ifd->status = 0;
1071                 ifd->actual_length = 0;
1072         }
1073         if (unlikely(nframe == 0))
1074                 return 0;       /* no data to send */
1075         urb->number_of_packets = nframe;
1076
1077         rc = usb_submit_urb(urb, GFP_ATOMIC);
1078         if (unlikely(rc)) {
1079                 if (rc == -ENODEV)
1080                         /* device removed - give up silently */
1081                         gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
1082                 else
1083                         dev_err(ucx->bcs->cs->dev,
1084                                 "could not submit isochronous write URB: %s\n",
1085                                 get_usb_rcmsg(rc));
1086                 return rc;
1087         }
1088         ++ubc->numsub;
1089         return nframe;
1090 }
1091
1092 /* write_iso_tasklet
1093  * tasklet scheduled when an isochronous output URB from the Gigaset device
1094  * has completed
1095  * parameter:
1096  *      data    B channel state structure
1097  */
1098 static void write_iso_tasklet(unsigned long data)
1099 {
1100         struct bc_state *bcs = (struct bc_state *) data;
1101         struct bas_bc_state *ubc = bcs->hw.bas;
1102         struct cardstate *cs = bcs->cs;
1103         struct isow_urbctx_t *done, *next, *ovfl;
1104         struct urb *urb;
1105         int status;
1106         struct usb_iso_packet_descriptor *ifd;
1107         int offset;
1108         unsigned long flags;
1109         int i;
1110         struct sk_buff *skb;
1111         int len;
1112         int rc;
1113
1114         /* loop while completed URBs arrive in time */
1115         for (;;) {
1116                 if (unlikely(!(ubc->running))) {
1117                         gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1118                         return;
1119                 }
1120
1121                 /* retrieve completed URBs */
1122                 spin_lock_irqsave(&ubc->isooutlock, flags);
1123                 done = ubc->isooutdone;
1124                 ubc->isooutdone = NULL;
1125                 ovfl = ubc->isooutovfl;
1126                 ubc->isooutovfl = NULL;
1127                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1128                 if (ovfl) {
1129                         dev_err(cs->dev, "isochronous write buffer underrun\n");
1130                         error_hangup(bcs);
1131                         break;
1132                 }
1133                 if (!done)
1134                         break;
1135
1136                 /* submit free URB if available */
1137                 spin_lock_irqsave(&ubc->isooutlock, flags);
1138                 next = ubc->isooutfree;
1139                 ubc->isooutfree = NULL;
1140                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1141                 if (next) {
1142                         rc = submit_iso_write_urb(next);
1143                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1144                                 /* could not submit URB, put it back */
1145                                 spin_lock_irqsave(&ubc->isooutlock, flags);
1146                                 if (ubc->isooutfree == NULL) {
1147                                         ubc->isooutfree = next;
1148                                         next = NULL;
1149                                 }
1150                                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1151                                 if (next) {
1152                                         /* couldn't put it back */
1153                                         dev_err(cs->dev,
1154                                               "losing isochronous write URB\n");
1155                                         error_hangup(bcs);
1156                                 }
1157                         }
1158                 }
1159
1160                 /* process completed URB */
1161                 urb = done->urb;
1162                 status = done->status;
1163                 switch (status) {
1164                 case -EXDEV:                    /* partial completion */
1165                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1166                                 __func__);
1167                         /* fall through - what's the difference anyway? */
1168                 case 0:                         /* normal completion */
1169                         /* inspect individual frames
1170                          * assumptions (for lack of documentation):
1171                          * - actual_length bytes of first frame in error are
1172                          *   successfully sent
1173                          * - all following frames are not sent at all
1174                          */
1175                         offset = done->limit;   /* default (no error) */
1176                         for (i = 0; i < BAS_NUMFRAMES; i++) {
1177                                 ifd = &urb->iso_frame_desc[i];
1178                                 if (ifd->status ||
1179                                     ifd->actual_length != ifd->length) {
1180                                         dev_warn(cs->dev,
1181                                              "isochronous write: frame %d: %s, "
1182                                              "only %d of %d bytes sent\n",
1183                                              i, get_usb_statmsg(ifd->status),
1184                                              ifd->actual_length, ifd->length);
1185                                         offset = (ifd->offset +
1186                                                   ifd->actual_length)
1187                                                  % BAS_OUTBUFSIZE;
1188                                         break;
1189                                 }
1190                         }
1191 #ifdef CONFIG_GIGASET_DEBUG
1192                         /* check assumption on remaining frames */
1193                         for (; i < BAS_NUMFRAMES; i++) {
1194                                 ifd = &urb->iso_frame_desc[i];
1195                                 if (ifd->status != -EINPROGRESS
1196                                     || ifd->actual_length != 0) {
1197                                         dev_warn(cs->dev,
1198                                              "isochronous write: frame %d: %s, "
1199                                              "%d of %d bytes sent\n",
1200                                              i, get_usb_statmsg(ifd->status),
1201                                              ifd->actual_length, ifd->length);
1202                                         offset = (ifd->offset +
1203                                                   ifd->actual_length)
1204                                                  % BAS_OUTBUFSIZE;
1205                                         break;
1206                                 }
1207                         }
1208 #endif
1209                         break;
1210                 case -EPIPE:                    /* stall - probably underrun */
1211                         dev_err(cs->dev, "isochronous write stalled\n");
1212                         error_hangup(bcs);
1213                         break;
1214                 default:                        /* severe trouble */
1215                         dev_warn(cs->dev, "isochronous write: %s\n",
1216                                  get_usb_statmsg(status));
1217                 }
1218
1219                 /* mark the write buffer area covered by this URB as free */
1220                 if (done->limit >= 0)
1221                         ubc->isooutbuf->read = done->limit;
1222
1223                 /* mark URB as free */
1224                 spin_lock_irqsave(&ubc->isooutlock, flags);
1225                 next = ubc->isooutfree;
1226                 ubc->isooutfree = done;
1227                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1228                 if (next) {
1229                         /* only one URB still active - resubmit one */
1230                         rc = submit_iso_write_urb(next);
1231                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1232                                 /* couldn't submit */
1233                                 error_hangup(bcs);
1234                         }
1235                 }
1236         }
1237
1238         /* process queued SKBs */
1239         while ((skb = skb_dequeue(&bcs->squeue))) {
1240                 /* copy to output buffer, doing L2 encapsulation */
1241                 len = skb->len;
1242                 if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
1243                         /* insufficient buffer space, push back onto queue */
1244                         skb_queue_head(&bcs->squeue, skb);
1245                         gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
1246                                 __func__, skb_queue_len(&bcs->squeue));
1247                         break;
1248                 }
1249                 skb_pull(skb, len);
1250                 gigaset_skb_sent(bcs, skb);
1251                 dev_kfree_skb_any(skb);
1252         }
1253 }
1254
1255 /* Isochronous Read - Bottom Half */
1256 /* ============================== */
1257
1258 /* read_iso_tasklet
1259  * tasklet scheduled when an isochronous input URB from the Gigaset device
1260  * has completed
1261  * parameter:
1262  *      data    B channel state structure
1263  */
1264 static void read_iso_tasklet(unsigned long data)
1265 {
1266         struct bc_state *bcs = (struct bc_state *) data;
1267         struct bas_bc_state *ubc = bcs->hw.bas;
1268         struct cardstate *cs = bcs->cs;
1269         struct urb *urb;
1270         int status;
1271         char *rcvbuf;
1272         unsigned long flags;
1273         int totleft, numbytes, offset, frame, rc;
1274
1275         /* loop while more completed URBs arrive in the meantime */
1276         for (;;) {
1277                 /* retrieve URB */
1278                 spin_lock_irqsave(&ubc->isoinlock, flags);
1279                 urb = ubc->isoindone;
1280                 if (!urb) {
1281                         spin_unlock_irqrestore(&ubc->isoinlock, flags);
1282                         return;
1283                 }
1284                 status = ubc->isoinstatus;
1285                 ubc->isoindone = NULL;
1286                 if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1287                         dev_warn(cs->dev,
1288                                  "isochronous read overrun, "
1289                                  "dropped URB with status: %s, %d bytes lost\n",
1290                                  get_usb_statmsg(ubc->loststatus),
1291                                  ubc->isoinlost);
1292                         ubc->loststatus = -EINPROGRESS;
1293                 }
1294                 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1295
1296                 if (unlikely(!(ubc->running))) {
1297                         gig_dbg(DEBUG_ISO,
1298                                 "%s: channel not running, "
1299                                 "dropped URB with status: %s",
1300                                 __func__, get_usb_statmsg(status));
1301                         return;
1302                 }
1303
1304                 switch (status) {
1305                 case 0:                         /* normal completion */
1306                         break;
1307                 case -EXDEV:                    /* inspect individual frames
1308                                                    (we do that anyway) */
1309                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1310                                 __func__);
1311                         break;
1312                 case -ENOENT:
1313                 case -ECONNRESET:
1314                 case -EINPROGRESS:
1315                         gig_dbg(DEBUG_ISO, "%s: %s",
1316                                 __func__, get_usb_statmsg(status));
1317                         continue;               /* -> skip */
1318                 case -EPIPE:
1319                         dev_err(cs->dev, "isochronous read stalled\n");
1320                         error_hangup(bcs);
1321                         continue;               /* -> skip */
1322                 default:                        /* severe trouble */
1323                         dev_warn(cs->dev, "isochronous read: %s\n",
1324                                  get_usb_statmsg(status));
1325                         goto error;
1326                 }
1327
1328                 rcvbuf = urb->transfer_buffer;
1329                 totleft = urb->actual_length;
1330                 for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1331                         numbytes = urb->iso_frame_desc[frame].actual_length;
1332                         if (unlikely(urb->iso_frame_desc[frame].status))
1333                                 dev_warn(cs->dev,
1334                                          "isochronous read: frame %d[%d]: %s\n",
1335                                          frame, numbytes,
1336                                          get_usb_statmsg(
1337                                             urb->iso_frame_desc[frame].status));
1338                         if (unlikely(numbytes > BAS_MAXFRAME))
1339                                 dev_warn(cs->dev,
1340                                          "isochronous read: frame %d: "
1341                                          "numbytes (%d) > BAS_MAXFRAME\n",
1342                                          frame, numbytes);
1343                         if (unlikely(numbytes > totleft)) {
1344                                 dev_warn(cs->dev,
1345                                          "isochronous read: frame %d: "
1346                                          "numbytes (%d) > totleft (%d)\n",
1347                                          frame, numbytes, totleft);
1348                                 numbytes = totleft;
1349                         }
1350                         offset = urb->iso_frame_desc[frame].offset;
1351                         if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1352                                 dev_warn(cs->dev,
1353                                          "isochronous read: frame %d: "
1354                                          "offset (%d) + numbytes (%d) "
1355                                          "> BAS_INBUFSIZE\n",
1356                                          frame, offset, numbytes);
1357                                 numbytes = BAS_INBUFSIZE - offset;
1358                         }
1359                         gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1360                         totleft -= numbytes;
1361                 }
1362                 if (unlikely(totleft > 0))
1363                         dev_warn(cs->dev,
1364                                  "isochronous read: %d data bytes missing\n",
1365                                  totleft);
1366
1367 error:
1368                 /* URB processed, resubmit */
1369                 for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1370                         urb->iso_frame_desc[frame].status = 0;
1371                         urb->iso_frame_desc[frame].actual_length = 0;
1372                 }
1373                 /* urb->dev is clobbered by USB subsystem */
1374                 urb->dev = bcs->cs->hw.bas->udev;
1375                 urb->transfer_flags = URB_ISO_ASAP;
1376                 urb->number_of_packets = BAS_NUMFRAMES;
1377                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1378                 if (unlikely(rc != 0 && rc != -ENODEV)) {
1379                         dev_err(cs->dev,
1380                                 "could not resubmit isochronous read URB: %s\n",
1381                                 get_usb_rcmsg(rc));
1382                         dump_urb(DEBUG_ISO, "resubmit iso read", urb);
1383                         error_hangup(bcs);
1384                 }
1385         }
1386 }
1387
1388 /* Channel Operations */
1389 /* ================== */
1390
1391 /* req_timeout
1392  * timeout routine for control output request
1393  * argument:
1394  *      B channel control structure
1395  */
1396 static void req_timeout(unsigned long data)
1397 {
1398         struct bc_state *bcs = (struct bc_state *) data;
1399         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1400         int pending;
1401         unsigned long flags;
1402
1403         check_pending(ucs);
1404
1405         spin_lock_irqsave(&ucs->lock, flags);
1406         pending = ucs->pending;
1407         ucs->pending = 0;
1408         spin_unlock_irqrestore(&ucs->lock, flags);
1409
1410         switch (pending) {
1411         case 0:                                 /* no pending request */
1412                 gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1413                 break;
1414
1415         case HD_OPEN_ATCHANNEL:
1416                 dev_err(bcs->cs->dev, "timeout opening AT channel\n");
1417                 error_reset(bcs->cs);
1418                 break;
1419
1420         case HD_OPEN_B2CHANNEL:
1421         case HD_OPEN_B1CHANNEL:
1422                 dev_err(bcs->cs->dev, "timeout opening channel %d\n",
1423                         bcs->channel + 1);
1424                 error_hangup(bcs);
1425                 break;
1426
1427         case HD_CLOSE_ATCHANNEL:
1428                 dev_err(bcs->cs->dev, "timeout closing AT channel\n");
1429                 error_reset(bcs->cs);
1430                 break;
1431
1432         case HD_CLOSE_B2CHANNEL:
1433         case HD_CLOSE_B1CHANNEL:
1434                 dev_err(bcs->cs->dev, "timeout closing channel %d\n",
1435                         bcs->channel + 1);
1436                 error_reset(bcs->cs);
1437                 break;
1438
1439         case HD_RESET_INTERRUPT_PIPE:
1440                 /* error recovery escalation */
1441                 dev_err(bcs->cs->dev,
1442                         "reset interrupt pipe timeout, attempting USB reset\n");
1443                 usb_queue_reset_device(bcs->cs->hw.bas->interface);
1444                 break;
1445
1446         default:
1447                 dev_warn(bcs->cs->dev, "request 0x%02x timed out, clearing\n",
1448                          pending);
1449         }
1450
1451         wake_up(&ucs->waitqueue);
1452 }
1453
1454 /* write_ctrl_callback
1455  * USB completion handler for control pipe output
1456  * called by the USB subsystem in interrupt context
1457  * parameter:
1458  *      urb     USB request block of completed request
1459  *              urb->context = hardware specific controller state structure
1460  */
1461 static void write_ctrl_callback(struct urb *urb)
1462 {
1463         struct bas_cardstate *ucs = urb->context;
1464         int status = urb->status;
1465         int rc;
1466         unsigned long flags;
1467
1468         /* check status */
1469         switch (status) {
1470         case 0:                                 /* normal completion */
1471                 spin_lock_irqsave(&ucs->lock, flags);
1472                 switch (ucs->pending) {
1473                 case HD_DEVICE_INIT_ACK:        /* no reply expected */
1474                         del_timer(&ucs->timer_ctrl);
1475                         ucs->pending = 0;
1476                         break;
1477                 }
1478                 spin_unlock_irqrestore(&ucs->lock, flags);
1479                 return;
1480
1481         case -ENOENT:                   /* cancelled */
1482         case -ECONNRESET:               /* cancelled (async) */
1483         case -EINPROGRESS:              /* pending */
1484         case -ENODEV:                   /* device removed */
1485         case -ESHUTDOWN:                /* device shut down */
1486                 /* ignore silently */
1487                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1488                         __func__, get_usb_statmsg(status));
1489                 break;
1490
1491         default:                                /* any failure */
1492                 /* don't retry if suspend requested */
1493                 if (++ucs->retry_ctrl > BAS_RETRY ||
1494                     (ucs->basstate & BS_SUSPEND)) {
1495                         dev_err(&ucs->interface->dev,
1496                                 "control request 0x%02x failed: %s\n",
1497                                 ucs->dr_ctrl.bRequest,
1498                                 get_usb_statmsg(status));
1499                         break;          /* give up */
1500                 }
1501                 dev_notice(&ucs->interface->dev,
1502                            "control request 0x%02x: %s, retry %d\n",
1503                            ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
1504                            ucs->retry_ctrl);
1505                 /* urb->dev is clobbered by USB subsystem */
1506                 urb->dev = ucs->udev;
1507                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1508                 if (unlikely(rc)) {
1509                         dev_err(&ucs->interface->dev,
1510                                 "could not resubmit request 0x%02x: %s\n",
1511                                 ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
1512                         break;
1513                 }
1514                 /* resubmitted */
1515                 return;
1516         }
1517
1518         /* failed, clear pending request */
1519         spin_lock_irqsave(&ucs->lock, flags);
1520         del_timer(&ucs->timer_ctrl);
1521         ucs->pending = 0;
1522         spin_unlock_irqrestore(&ucs->lock, flags);
1523         wake_up(&ucs->waitqueue);
1524 }
1525
1526 /* req_submit
1527  * submit a control output request without message buffer to the Gigaset base
1528  * and optionally start a timeout
1529  * parameters:
1530  *      bcs     B channel control structure
1531  *      req     control request code (HD_*)
1532  *      val     control request parameter value (set to 0 if unused)
1533  *      timeout timeout in seconds (0: no timeout)
1534  * return value:
1535  *      0 on success
1536  *      -EBUSY if another request is pending
1537  *      any URB submission error code
1538  */
1539 static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1540 {
1541         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1542         int ret;
1543         unsigned long flags;
1544
1545         gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1546
1547         spin_lock_irqsave(&ucs->lock, flags);
1548         if (ucs->pending) {
1549                 spin_unlock_irqrestore(&ucs->lock, flags);
1550                 dev_err(bcs->cs->dev,
1551                         "submission of request 0x%02x failed: "
1552                         "request 0x%02x still pending\n",
1553                         req, ucs->pending);
1554                 return -EBUSY;
1555         }
1556
1557         ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1558         ucs->dr_ctrl.bRequest = req;
1559         ucs->dr_ctrl.wValue = cpu_to_le16(val);
1560         ucs->dr_ctrl.wIndex = 0;
1561         ucs->dr_ctrl.wLength = 0;
1562         usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1563                              usb_sndctrlpipe(ucs->udev, 0),
1564                              (unsigned char *) &ucs->dr_ctrl, NULL, 0,
1565                              write_ctrl_callback, ucs);
1566         ucs->retry_ctrl = 0;
1567         ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
1568         if (unlikely(ret)) {
1569                 dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1570                         req, get_usb_rcmsg(ret));
1571                 spin_unlock_irqrestore(&ucs->lock, flags);
1572                 return ret;
1573         }
1574         ucs->pending = req;
1575
1576         if (timeout > 0) {
1577                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1578                 ucs->timer_ctrl.expires = jiffies + timeout * HZ / 10;
1579                 ucs->timer_ctrl.data = (unsigned long) bcs;
1580                 ucs->timer_ctrl.function = req_timeout;
1581                 add_timer(&ucs->timer_ctrl);
1582         }
1583
1584         spin_unlock_irqrestore(&ucs->lock, flags);
1585         return 0;
1586 }
1587
1588 /* gigaset_init_bchannel
1589  * called by common.c to connect a B channel
1590  * initialize isochronous I/O and tell the Gigaset base to open the channel
1591  * argument:
1592  *      B channel control structure
1593  * return value:
1594  *      0 on success, error code < 0 on error
1595  */
1596 static int gigaset_init_bchannel(struct bc_state *bcs)
1597 {
1598         struct cardstate *cs = bcs->cs;
1599         int req, ret;
1600         unsigned long flags;
1601
1602         spin_lock_irqsave(&cs->lock, flags);
1603         if (unlikely(!cs->connected)) {
1604                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1605                 spin_unlock_irqrestore(&cs->lock, flags);
1606                 return -ENODEV;
1607         }
1608
1609         if (cs->hw.bas->basstate & BS_SUSPEND) {
1610                 dev_notice(cs->dev,
1611                            "not starting isochronous I/O, "
1612                            "suspend in progress\n");
1613                 spin_unlock_irqrestore(&cs->lock, flags);
1614                 return -EHOSTUNREACH;
1615         }
1616
1617         ret = starturbs(bcs);
1618         if (ret < 0) {
1619                 dev_err(cs->dev,
1620                         "could not start isochronous I/O for channel B%d: %s\n",
1621                         bcs->channel + 1,
1622                         ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
1623                 if (ret != -ENODEV)
1624                         error_hangup(bcs);
1625                 spin_unlock_irqrestore(&cs->lock, flags);
1626                 return ret;
1627         }
1628
1629         req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1630         ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1631         if (ret < 0) {
1632                 dev_err(cs->dev, "could not open channel B%d\n",
1633                         bcs->channel + 1);
1634                 stopurbs(bcs->hw.bas);
1635                 if (ret != -ENODEV)
1636                         error_hangup(bcs);
1637         }
1638
1639         spin_unlock_irqrestore(&cs->lock, flags);
1640         return ret;
1641 }
1642
1643 /* gigaset_close_bchannel
1644  * called by common.c to disconnect a B channel
1645  * tell the Gigaset base to close the channel
1646  * stopping isochronous I/O and LL notification will be done when the
1647  * acknowledgement for the close arrives
1648  * argument:
1649  *      B channel control structure
1650  * return value:
1651  *      0 on success, error code < 0 on error
1652  */
1653 static int gigaset_close_bchannel(struct bc_state *bcs)
1654 {
1655         struct cardstate *cs = bcs->cs;
1656         int req, ret;
1657         unsigned long flags;
1658
1659         spin_lock_irqsave(&cs->lock, flags);
1660         if (unlikely(!cs->connected)) {
1661                 spin_unlock_irqrestore(&cs->lock, flags);
1662                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1663                 return -ENODEV;
1664         }
1665
1666         if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1667                 /* channel not running: just signal common.c */
1668                 spin_unlock_irqrestore(&cs->lock, flags);
1669                 gigaset_bchannel_down(bcs);
1670                 return 0;
1671         }
1672
1673         /* channel running: tell device to close it */
1674         req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1675         ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1676         if (ret < 0)
1677                 dev_err(cs->dev, "closing channel B%d failed\n",
1678                         bcs->channel + 1);
1679
1680         spin_unlock_irqrestore(&cs->lock, flags);
1681         return ret;
1682 }
1683
1684 /* Device Operations */
1685 /* ================= */
1686
1687 /* complete_cb
1688  * unqueue first command buffer from queue, waking any sleepers
1689  * must be called with cs->cmdlock held
1690  * parameter:
1691  *      cs      controller state structure
1692  */
1693 static void complete_cb(struct cardstate *cs)
1694 {
1695         struct cmdbuf_t *cb = cs->cmdbuf;
1696
1697         /* unqueue completed buffer */
1698         cs->cmdbytes -= cs->curlen;
1699         gig_dbg(DEBUG_OUTPUT, "write_command: sent %u bytes, %u left",
1700                 cs->curlen, cs->cmdbytes);
1701         if (cb->next != NULL) {
1702                 cs->cmdbuf = cb->next;
1703                 cs->cmdbuf->prev = NULL;
1704                 cs->curlen = cs->cmdbuf->len;
1705         } else {
1706                 cs->cmdbuf = NULL;
1707                 cs->lastcmdbuf = NULL;
1708                 cs->curlen = 0;
1709         }
1710
1711         if (cb->wake_tasklet)
1712                 tasklet_schedule(cb->wake_tasklet);
1713
1714         kfree(cb);
1715 }
1716
1717 /* write_command_callback
1718  * USB completion handler for AT command transmission
1719  * called by the USB subsystem in interrupt context
1720  * parameter:
1721  *      urb     USB request block of completed request
1722  *              urb->context = controller state structure
1723  */
1724 static void write_command_callback(struct urb *urb)
1725 {
1726         struct cardstate *cs = urb->context;
1727         struct bas_cardstate *ucs = cs->hw.bas;
1728         int status = urb->status;
1729         unsigned long flags;
1730
1731         update_basstate(ucs, 0, BS_ATWRPEND);
1732         wake_up(&ucs->waitqueue);
1733
1734         /* check status */
1735         switch (status) {
1736         case 0:                                 /* normal completion */
1737                 break;
1738         case -ENOENT:                   /* cancelled */
1739         case -ECONNRESET:               /* cancelled (async) */
1740         case -EINPROGRESS:              /* pending */
1741         case -ENODEV:                   /* device removed */
1742         case -ESHUTDOWN:                /* device shut down */
1743                 /* ignore silently */
1744                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1745                         __func__, get_usb_statmsg(status));
1746                 return;
1747         default:                                /* any failure */
1748                 if (++ucs->retry_cmd_out > BAS_RETRY) {
1749                         dev_warn(cs->dev,
1750                                  "command write: %s, "
1751                                  "giving up after %d retries\n",
1752                                  get_usb_statmsg(status),
1753                                  ucs->retry_cmd_out);
1754                         break;
1755                 }
1756                 if (ucs->basstate & BS_SUSPEND) {
1757                         dev_warn(cs->dev,
1758                                  "command write: %s, "
1759                                  "won't retry - suspend requested\n",
1760                                  get_usb_statmsg(status));
1761                         break;
1762                 }
1763                 if (cs->cmdbuf == NULL) {
1764                         dev_warn(cs->dev,
1765                                  "command write: %s, "
1766                                  "cannot retry - cmdbuf gone\n",
1767                                  get_usb_statmsg(status));
1768                         break;
1769                 }
1770                 dev_notice(cs->dev, "command write: %s, retry %d\n",
1771                            get_usb_statmsg(status), ucs->retry_cmd_out);
1772                 if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1773                         /* resubmitted - bypass regular exit block */
1774                         return;
1775                 /* command send failed, assume base still waiting */
1776                 update_basstate(ucs, BS_ATREADY, 0);
1777         }
1778
1779         spin_lock_irqsave(&cs->cmdlock, flags);
1780         if (cs->cmdbuf != NULL)
1781                 complete_cb(cs);
1782         spin_unlock_irqrestore(&cs->cmdlock, flags);
1783 }
1784
1785 /* atrdy_timeout
1786  * timeout routine for AT command transmission
1787  * argument:
1788  *      controller state structure
1789  */
1790 static void atrdy_timeout(unsigned long data)
1791 {
1792         struct cardstate *cs = (struct cardstate *) data;
1793         struct bas_cardstate *ucs = cs->hw.bas;
1794
1795         dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1796
1797         /* fake the missing signal - what else can I do? */
1798         update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1799         start_cbsend(cs);
1800 }
1801
1802 /* atwrite_submit
1803  * submit an HD_WRITE_ATMESSAGE command URB
1804  * parameters:
1805  *      cs      controller state structure
1806  *      buf     buffer containing command to send
1807  *      len     length of command to send
1808  * return value:
1809  *      0 on success
1810  *      -EBUSY if another request is pending
1811  *      any URB submission error code
1812  */
1813 static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1814 {
1815         struct bas_cardstate *ucs = cs->hw.bas;
1816         int rc;
1817
1818         gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1819
1820         if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1821                 dev_err(cs->dev,
1822                         "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1823                 return -EBUSY;
1824         }
1825
1826         ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1827         ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1828         ucs->dr_cmd_out.wValue = 0;
1829         ucs->dr_cmd_out.wIndex = 0;
1830         ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1831         usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1832                              usb_sndctrlpipe(ucs->udev, 0),
1833                              (unsigned char *) &ucs->dr_cmd_out, buf, len,
1834                              write_command_callback, cs);
1835         rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
1836         if (unlikely(rc)) {
1837                 update_basstate(ucs, 0, BS_ATWRPEND);
1838                 dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1839                         get_usb_rcmsg(rc));
1840                 return rc;
1841         }
1842
1843         /* submitted successfully, start timeout if necessary */
1844         if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1845                 gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
1846                         ATRDY_TIMEOUT);
1847                 ucs->timer_atrdy.expires = jiffies + ATRDY_TIMEOUT * HZ / 10;
1848                 ucs->timer_atrdy.data = (unsigned long) cs;
1849                 ucs->timer_atrdy.function = atrdy_timeout;
1850                 add_timer(&ucs->timer_atrdy);
1851         }
1852         return 0;
1853 }
1854
1855 /* start_cbsend
1856  * start transmission of AT command queue if necessary
1857  * parameter:
1858  *      cs              controller state structure
1859  * return value:
1860  *      0 on success
1861  *      error code < 0 on error
1862  */
1863 static int start_cbsend(struct cardstate *cs)
1864 {
1865         struct cmdbuf_t *cb;
1866         struct bas_cardstate *ucs = cs->hw.bas;
1867         unsigned long flags;
1868         int rc;
1869         int retval = 0;
1870
1871         /* check if suspend requested */
1872         if (ucs->basstate & BS_SUSPEND) {
1873                 gig_dbg(DEBUG_OUTPUT, "suspending");
1874                 return -EHOSTUNREACH;
1875         }
1876
1877         /* check if AT channel is open */
1878         if (!(ucs->basstate & BS_ATOPEN)) {
1879                 gig_dbg(DEBUG_OUTPUT, "AT channel not open");
1880                 rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1881                 if (rc < 0) {
1882                         /* flush command queue */
1883                         spin_lock_irqsave(&cs->cmdlock, flags);
1884                         while (cs->cmdbuf != NULL)
1885                                 complete_cb(cs);
1886                         spin_unlock_irqrestore(&cs->cmdlock, flags);
1887                 }
1888                 return rc;
1889         }
1890
1891         /* try to send first command in queue */
1892         spin_lock_irqsave(&cs->cmdlock, flags);
1893
1894         while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
1895                 ucs->retry_cmd_out = 0;
1896                 rc = atwrite_submit(cs, cb->buf, cb->len);
1897                 if (unlikely(rc)) {
1898                         retval = rc;
1899                         complete_cb(cs);
1900                 }
1901         }
1902
1903         spin_unlock_irqrestore(&cs->cmdlock, flags);
1904         return retval;
1905 }
1906
1907 /* gigaset_write_cmd
1908  * This function is called by the device independent part of the driver
1909  * to transmit an AT command string to the Gigaset device.
1910  * It encapsulates the device specific method for transmission over the
1911  * direct USB connection to the base.
1912  * The command string is added to the queue of commands to send, and
1913  * USB transmission is started if necessary.
1914  * parameters:
1915  *      cs              controller state structure
1916  *      buf             command string to send
1917  *      len             number of bytes to send (max. IF_WRITEBUF)
1918  *      wake_tasklet    tasklet to run when transmission is completed
1919  *                      (NULL if none)
1920  * return value:
1921  *      number of bytes queued on success
1922  *      error code < 0 on error
1923  */
1924 static int gigaset_write_cmd(struct cardstate *cs,
1925                              const unsigned char *buf, int len,
1926                              struct tasklet_struct *wake_tasklet)
1927 {
1928         struct cmdbuf_t *cb;
1929         unsigned long flags;
1930         int rc;
1931
1932         gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
1933                              DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1934                            "CMD Transmit", len, buf);
1935
1936         if (len <= 0) {
1937                 /* nothing to do */
1938                 rc = 0;
1939                 goto notqueued;
1940         }
1941
1942         /* translate "+++" escape sequence sent as a single separate command
1943          * into "close AT channel" command for error recovery
1944          * The next command will reopen the AT channel automatically.
1945          */
1946         if (len == 3 && !memcmp(buf, "+++", 3)) {
1947                 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
1948                 goto notqueued;
1949         }
1950
1951         if (len > IF_WRITEBUF)
1952                 len = IF_WRITEBUF;
1953         cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC);
1954         if (!cb) {
1955                 dev_err(cs->dev, "%s: out of memory\n", __func__);
1956                 rc = -ENOMEM;
1957                 goto notqueued;
1958         }
1959
1960         memcpy(cb->buf, buf, len);
1961         cb->len = len;
1962         cb->offset = 0;
1963         cb->next = NULL;
1964         cb->wake_tasklet = wake_tasklet;
1965
1966         spin_lock_irqsave(&cs->cmdlock, flags);
1967         cb->prev = cs->lastcmdbuf;
1968         if (cs->lastcmdbuf)
1969                 cs->lastcmdbuf->next = cb;
1970         else {
1971                 cs->cmdbuf = cb;
1972                 cs->curlen = len;
1973         }
1974         cs->cmdbytes += len;
1975         cs->lastcmdbuf = cb;
1976         spin_unlock_irqrestore(&cs->cmdlock, flags);
1977
1978         spin_lock_irqsave(&cs->lock, flags);
1979         if (unlikely(!cs->connected)) {
1980                 spin_unlock_irqrestore(&cs->lock, flags);
1981                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1982                 /* flush command queue */
1983                 spin_lock_irqsave(&cs->cmdlock, flags);
1984                 while (cs->cmdbuf != NULL)
1985                         complete_cb(cs);
1986                 spin_unlock_irqrestore(&cs->cmdlock, flags);
1987                 return -ENODEV;
1988         }
1989         rc = start_cbsend(cs);
1990         spin_unlock_irqrestore(&cs->lock, flags);
1991         return rc < 0 ? rc : len;
1992
1993 notqueued:                      /* request handled without queuing */
1994         if (wake_tasklet)
1995                 tasklet_schedule(wake_tasklet);
1996         return rc;
1997 }
1998
1999 /* gigaset_write_room
2000  * tty_driver.write_room interface routine
2001  * return number of characters the driver will accept to be written via
2002  * gigaset_write_cmd
2003  * parameter:
2004  *      controller state structure
2005  * return value:
2006  *      number of characters
2007  */
2008 static int gigaset_write_room(struct cardstate *cs)
2009 {
2010         return IF_WRITEBUF;
2011 }
2012
2013 /* gigaset_chars_in_buffer
2014  * tty_driver.chars_in_buffer interface routine
2015  * return number of characters waiting to be sent
2016  * parameter:
2017  *      controller state structure
2018  * return value:
2019  *      number of characters
2020  */
2021 static int gigaset_chars_in_buffer(struct cardstate *cs)
2022 {
2023         return cs->cmdbytes;
2024 }
2025
2026 /* gigaset_brkchars
2027  * implementation of ioctl(GIGASET_BRKCHARS)
2028  * parameter:
2029  *      controller state structure
2030  * return value:
2031  *      -EINVAL (unimplemented function)
2032  */
2033 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
2034 {
2035         return -EINVAL;
2036 }
2037
2038
2039 /* Device Initialization/Shutdown */
2040 /* ============================== */
2041
2042 /* Free hardware dependent part of the B channel structure
2043  * parameter:
2044  *      bcs     B channel structure
2045  * return value:
2046  *      !=0 on success
2047  */
2048 static int gigaset_freebcshw(struct bc_state *bcs)
2049 {
2050         struct bas_bc_state *ubc = bcs->hw.bas;
2051         int i;
2052
2053         if (!ubc)
2054                 return 0;
2055
2056         /* kill URBs and tasklets before freeing - better safe than sorry */
2057         ubc->running = 0;
2058         gig_dbg(DEBUG_INIT, "%s: killing iso URBs", __func__);
2059         for (i = 0; i < BAS_OUTURBS; ++i) {
2060                 usb_kill_urb(ubc->isoouturbs[i].urb);
2061                 usb_free_urb(ubc->isoouturbs[i].urb);
2062         }
2063         for (i = 0; i < BAS_INURBS; ++i) {
2064                 usb_kill_urb(ubc->isoinurbs[i]);
2065                 usb_free_urb(ubc->isoinurbs[i]);
2066         }
2067         tasklet_kill(&ubc->sent_tasklet);
2068         tasklet_kill(&ubc->rcvd_tasklet);
2069         kfree(ubc->isooutbuf);
2070         kfree(ubc);
2071         bcs->hw.bas = NULL;
2072         return 1;
2073 }
2074
2075 /* Initialize hardware dependent part of the B channel structure
2076  * parameter:
2077  *      bcs     B channel structure
2078  * return value:
2079  *      !=0 on success
2080  */
2081 static int gigaset_initbcshw(struct bc_state *bcs)
2082 {
2083         int i;
2084         struct bas_bc_state *ubc;
2085
2086         bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
2087         if (!ubc) {
2088                 pr_err("out of memory\n");
2089                 return 0;
2090         }
2091
2092         ubc->running = 0;
2093         atomic_set(&ubc->corrbytes, 0);
2094         spin_lock_init(&ubc->isooutlock);
2095         for (i = 0; i < BAS_OUTURBS; ++i) {
2096                 ubc->isoouturbs[i].urb = NULL;
2097                 ubc->isoouturbs[i].bcs = bcs;
2098         }
2099         ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
2100         ubc->numsub = 0;
2101         ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL);
2102         if (!ubc->isooutbuf) {
2103                 pr_err("out of memory\n");
2104                 kfree(ubc);
2105                 bcs->hw.bas = NULL;
2106                 return 0;
2107         }
2108         tasklet_init(&ubc->sent_tasklet,
2109                      write_iso_tasklet, (unsigned long) bcs);
2110
2111         spin_lock_init(&ubc->isoinlock);
2112         for (i = 0; i < BAS_INURBS; ++i)
2113                 ubc->isoinurbs[i] = NULL;
2114         ubc->isoindone = NULL;
2115         ubc->loststatus = -EINPROGRESS;
2116         ubc->isoinlost = 0;
2117         ubc->seqlen = 0;
2118         ubc->inbyte = 0;
2119         ubc->inbits = 0;
2120         ubc->goodbytes = 0;
2121         ubc->alignerrs = 0;
2122         ubc->fcserrs = 0;
2123         ubc->frameerrs = 0;
2124         ubc->giants = 0;
2125         ubc->runts = 0;
2126         ubc->aborts = 0;
2127         ubc->shared0s = 0;
2128         ubc->stolen0s = 0;
2129         tasklet_init(&ubc->rcvd_tasklet,
2130                      read_iso_tasklet, (unsigned long) bcs);
2131         return 1;
2132 }
2133
2134 static void gigaset_reinitbcshw(struct bc_state *bcs)
2135 {
2136         struct bas_bc_state *ubc = bcs->hw.bas;
2137
2138         bcs->hw.bas->running = 0;
2139         atomic_set(&bcs->hw.bas->corrbytes, 0);
2140         bcs->hw.bas->numsub = 0;
2141         spin_lock_init(&ubc->isooutlock);
2142         spin_lock_init(&ubc->isoinlock);
2143         ubc->loststatus = -EINPROGRESS;
2144 }
2145
2146 static void gigaset_freecshw(struct cardstate *cs)
2147 {
2148         /* timers, URBs and rcvbuf are disposed of in disconnect */
2149         kfree(cs->hw.bas->int_in_buf);
2150         kfree(cs->hw.bas);
2151         cs->hw.bas = NULL;
2152 }
2153
2154 static int gigaset_initcshw(struct cardstate *cs)
2155 {
2156         struct bas_cardstate *ucs;
2157
2158         cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
2159         if (!ucs) {
2160                 pr_err("out of memory\n");
2161                 return 0;
2162         }
2163         ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
2164         if (!ucs->int_in_buf) {
2165                 kfree(ucs);
2166                 pr_err("out of memory\n");
2167                 return 0;
2168         }
2169
2170         ucs->urb_cmd_in = NULL;
2171         ucs->urb_cmd_out = NULL;
2172         ucs->rcvbuf = NULL;
2173         ucs->rcvbuf_size = 0;
2174
2175         spin_lock_init(&ucs->lock);
2176         ucs->pending = 0;
2177
2178         ucs->basstate = 0;
2179         init_timer(&ucs->timer_ctrl);
2180         init_timer(&ucs->timer_atrdy);
2181         init_timer(&ucs->timer_cmd_in);
2182         init_waitqueue_head(&ucs->waitqueue);
2183
2184         return 1;
2185 }
2186
2187 /* freeurbs
2188  * unlink and deallocate all URBs unconditionally
2189  * caller must make sure that no commands are still in progress
2190  * parameter:
2191  *      cs      controller state structure
2192  */
2193 static void freeurbs(struct cardstate *cs)
2194 {
2195         struct bas_cardstate *ucs = cs->hw.bas;
2196         struct bas_bc_state *ubc;
2197         int i, j;
2198
2199         gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
2200         for (j = 0; j < BAS_CHANNELS; ++j) {
2201                 ubc = cs->bcs[j].hw.bas;
2202                 for (i = 0; i < BAS_OUTURBS; ++i) {
2203                         usb_kill_urb(ubc->isoouturbs[i].urb);
2204                         usb_free_urb(ubc->isoouturbs[i].urb);
2205                         ubc->isoouturbs[i].urb = NULL;
2206                 }
2207                 for (i = 0; i < BAS_INURBS; ++i) {
2208                         usb_kill_urb(ubc->isoinurbs[i]);
2209                         usb_free_urb(ubc->isoinurbs[i]);
2210                         ubc->isoinurbs[i] = NULL;
2211                 }
2212         }
2213         usb_kill_urb(ucs->urb_int_in);
2214         usb_free_urb(ucs->urb_int_in);
2215         ucs->urb_int_in = NULL;
2216         usb_kill_urb(ucs->urb_cmd_out);
2217         usb_free_urb(ucs->urb_cmd_out);
2218         ucs->urb_cmd_out = NULL;
2219         usb_kill_urb(ucs->urb_cmd_in);
2220         usb_free_urb(ucs->urb_cmd_in);
2221         ucs->urb_cmd_in = NULL;
2222         usb_kill_urb(ucs->urb_ctrl);
2223         usb_free_urb(ucs->urb_ctrl);
2224         ucs->urb_ctrl = NULL;
2225 }
2226
2227 /* gigaset_probe
2228  * This function is called when a new USB device is connected.
2229  * It checks whether the new device is handled by this driver.
2230  */
2231 static int gigaset_probe(struct usb_interface *interface,
2232                          const struct usb_device_id *id)
2233 {
2234         struct usb_host_interface *hostif;
2235         struct usb_device *udev = interface_to_usbdev(interface);
2236         struct cardstate *cs = NULL;
2237         struct bas_cardstate *ucs = NULL;
2238         struct bas_bc_state *ubc;
2239         struct usb_endpoint_descriptor *endpoint;
2240         int i, j;
2241         int rc;
2242
2243         gig_dbg(DEBUG_INIT,
2244                 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2245                 __func__, le16_to_cpu(udev->descriptor.idVendor),
2246                 le16_to_cpu(udev->descriptor.idProduct));
2247
2248         /* set required alternate setting */
2249         hostif = interface->cur_altsetting;
2250         if (hostif->desc.bAlternateSetting != 3) {
2251                 gig_dbg(DEBUG_INIT,
2252                         "%s: wrong alternate setting %d - trying to switch",
2253                         __func__, hostif->desc.bAlternateSetting);
2254                 if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3)
2255                     < 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         rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2325         if (rc != 0) {
2326                 dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2327                         get_usb_rcmsg(rc));
2328                 goto error;
2329         }
2330
2331         /* tell the device that the driver is ready */
2332         rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0);
2333         if (rc != 0)
2334                 goto error;
2335
2336         /* tell common part that the device is ready */
2337         if (startmode == SM_LOCKED)
2338                 cs->mstate = MS_LOCKED;
2339
2340         /* save address of controller structure */
2341         usb_set_intfdata(interface, cs);
2342
2343         if (!gigaset_start(cs))
2344                 goto error;
2345
2346         return 0;
2347
2348 allocerr:
2349         dev_err(cs->dev, "could not allocate URBs\n");
2350 error:
2351         freeurbs(cs);
2352         usb_set_intfdata(interface, NULL);
2353         gigaset_freecs(cs);
2354         return -ENODEV;
2355 }
2356
2357 /* gigaset_disconnect
2358  * This function is called when the Gigaset base is unplugged.
2359  */
2360 static void gigaset_disconnect(struct usb_interface *interface)
2361 {
2362         struct cardstate *cs;
2363         struct bas_cardstate *ucs;
2364         int j;
2365
2366         cs = usb_get_intfdata(interface);
2367
2368         ucs = cs->hw.bas;
2369
2370         dev_info(cs->dev, "disconnecting Gigaset base\n");
2371
2372         /* mark base as not ready, all channels disconnected */
2373         ucs->basstate = 0;
2374
2375         /* tell LL all channels are down */
2376         for (j = 0; j < BAS_CHANNELS; ++j)
2377                 gigaset_bchannel_down(cs->bcs + j);
2378
2379         /* stop driver (common part) */
2380         gigaset_stop(cs);
2381
2382         /* stop timers and URBs, free ressources */
2383         del_timer_sync(&ucs->timer_ctrl);
2384         del_timer_sync(&ucs->timer_atrdy);
2385         del_timer_sync(&ucs->timer_cmd_in);
2386         freeurbs(cs);
2387         usb_set_intfdata(interface, NULL);
2388         kfree(ucs->rcvbuf);
2389         ucs->rcvbuf = NULL;
2390         ucs->rcvbuf_size = 0;
2391         usb_put_dev(ucs->udev);
2392         ucs->interface = NULL;
2393         ucs->udev = NULL;
2394         cs->dev = NULL;
2395         gigaset_freecs(cs);
2396 }
2397
2398 /* gigaset_suspend
2399  * This function is called before the USB connection is suspended.
2400  */
2401 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
2402 {
2403         struct cardstate *cs = usb_get_intfdata(intf);
2404         struct bas_cardstate *ucs = cs->hw.bas;
2405         int rc;
2406
2407         /* set suspend flag; this stops AT command/response traffic */
2408         if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
2409                 gig_dbg(DEBUG_SUSPEND, "already suspended");
2410                 return 0;
2411         }
2412
2413         /* wait a bit for blocking conditions to go away */
2414         rc = wait_event_timeout(ucs->waitqueue,
2415                         !(ucs->basstate &
2416                           (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)),
2417                         BAS_TIMEOUT*HZ/10);
2418         gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
2419
2420         /* check for conditions preventing suspend */
2421         if (ucs->basstate & (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)) {
2422                 dev_warn(cs->dev, "cannot suspend:\n");
2423                 if (ucs->basstate & BS_B1OPEN)
2424                         dev_warn(cs->dev, " B channel 1 open\n");
2425                 if (ucs->basstate & BS_B2OPEN)
2426                         dev_warn(cs->dev, " B channel 2 open\n");
2427                 if (ucs->basstate & BS_ATRDPEND)
2428                         dev_warn(cs->dev, " receiving AT reply\n");
2429                 if (ucs->basstate & BS_ATWRPEND)
2430                         dev_warn(cs->dev, " sending AT command\n");
2431                 update_basstate(ucs, 0, BS_SUSPEND);
2432                 return -EBUSY;
2433         }
2434
2435         /* close AT channel if open */
2436         if (ucs->basstate & BS_ATOPEN) {
2437                 gig_dbg(DEBUG_SUSPEND, "closing AT channel");
2438                 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
2439                 if (rc) {
2440                         update_basstate(ucs, 0, BS_SUSPEND);
2441                         return rc;
2442                 }
2443                 wait_event_timeout(ucs->waitqueue, !ucs->pending,
2444                                    BAS_TIMEOUT*HZ/10);
2445                 /* in case of timeout, proceed anyway */
2446         }
2447
2448         /* kill all URBs and timers that might still be pending */
2449         usb_kill_urb(ucs->urb_ctrl);
2450         usb_kill_urb(ucs->urb_int_in);
2451         del_timer_sync(&ucs->timer_ctrl);
2452
2453         gig_dbg(DEBUG_SUSPEND, "suspend complete");
2454         return 0;
2455 }
2456
2457 /* gigaset_resume
2458  * This function is called after the USB connection has been resumed.
2459  */
2460 static int gigaset_resume(struct usb_interface *intf)
2461 {
2462         struct cardstate *cs = usb_get_intfdata(intf);
2463         struct bas_cardstate *ucs = cs->hw.bas;
2464         int rc;
2465
2466         /* resubmit interrupt URB for spontaneous messages from base */
2467         rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2468         if (rc) {
2469                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
2470                         get_usb_rcmsg(rc));
2471                 return rc;
2472         }
2473
2474         /* clear suspend flag to reallow activity */
2475         update_basstate(ucs, 0, BS_SUSPEND);
2476
2477         gig_dbg(DEBUG_SUSPEND, "resume complete");
2478         return 0;
2479 }
2480
2481 /* gigaset_pre_reset
2482  * This function is called before the USB connection is reset.
2483  */
2484 static int gigaset_pre_reset(struct usb_interface *intf)
2485 {
2486         /* handle just like suspend */
2487         return gigaset_suspend(intf, PMSG_ON);
2488 }
2489
2490 /* gigaset_post_reset
2491  * This function is called after the USB connection has been reset.
2492  */
2493 static int gigaset_post_reset(struct usb_interface *intf)
2494 {
2495         /* FIXME: send HD_DEVICE_INIT_ACK? */
2496
2497         /* resume operations */
2498         return gigaset_resume(intf);
2499 }
2500
2501
2502 static const struct gigaset_ops gigops = {
2503         gigaset_write_cmd,
2504         gigaset_write_room,
2505         gigaset_chars_in_buffer,
2506         gigaset_brkchars,
2507         gigaset_init_bchannel,
2508         gigaset_close_bchannel,
2509         gigaset_initbcshw,
2510         gigaset_freebcshw,
2511         gigaset_reinitbcshw,
2512         gigaset_initcshw,
2513         gigaset_freecshw,
2514         gigaset_set_modem_ctrl,
2515         gigaset_baud_rate,
2516         gigaset_set_line_ctrl,
2517         gigaset_isoc_send_skb,
2518         gigaset_isoc_input,
2519 };
2520
2521 /* bas_gigaset_init
2522  * This function is called after the kernel module is loaded.
2523  */
2524 static int __init bas_gigaset_init(void)
2525 {
2526         int result;
2527
2528         /* allocate memory for our driver state and intialize it */
2529         driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2530                                     GIGASET_MODULENAME, GIGASET_DEVNAME,
2531                                     &gigops, THIS_MODULE);
2532         if (driver == NULL)
2533                 goto error;
2534
2535         /* register this driver with the USB subsystem */
2536         result = usb_register(&gigaset_usb_driver);
2537         if (result < 0) {
2538                 pr_err("error %d registering USB driver\n", -result);
2539                 goto error;
2540         }
2541
2542         pr_info(DRIVER_DESC "\n");
2543         return 0;
2544
2545 error:
2546         if (driver)
2547                 gigaset_freedriver(driver);
2548         driver = NULL;
2549         return -1;
2550 }
2551
2552 /* bas_gigaset_exit
2553  * This function is called before the kernel module is unloaded.
2554  */
2555 static void __exit bas_gigaset_exit(void)
2556 {
2557         struct bas_cardstate *ucs;
2558         int i;
2559
2560         gigaset_blockdriver(driver); /* => probe will fail
2561                                       * => no gigaset_start any more
2562                                       */
2563
2564         /* stop all connected devices */
2565         for (i = 0; i < driver->minors; i++) {
2566                 if (gigaset_shutdown(driver->cs + i) < 0)
2567                         continue;               /* no device */
2568                 /* from now on, no isdn callback should be possible */
2569
2570                 /* close all still open channels */
2571                 ucs = driver->cs[i].hw.bas;
2572                 if (ucs->basstate & BS_B1OPEN) {
2573                         gig_dbg(DEBUG_INIT, "closing B1 channel");
2574                         usb_control_msg(ucs->udev,
2575                                         usb_sndctrlpipe(ucs->udev, 0),
2576                                         HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
2577                                         0, 0, NULL, 0, BAS_TIMEOUT);
2578                 }
2579                 if (ucs->basstate & BS_B2OPEN) {
2580                         gig_dbg(DEBUG_INIT, "closing B2 channel");
2581                         usb_control_msg(ucs->udev,
2582                                         usb_sndctrlpipe(ucs->udev, 0),
2583                                         HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
2584                                         0, 0, NULL, 0, BAS_TIMEOUT);
2585                 }
2586                 if (ucs->basstate & BS_ATOPEN) {
2587                         gig_dbg(DEBUG_INIT, "closing AT channel");
2588                         usb_control_msg(ucs->udev,
2589                                         usb_sndctrlpipe(ucs->udev, 0),
2590                                         HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
2591                                         0, 0, NULL, 0, BAS_TIMEOUT);
2592                 }
2593                 ucs->basstate = 0;
2594         }
2595
2596         /* deregister this driver with the USB subsystem */
2597         usb_deregister(&gigaset_usb_driver);
2598         /* this will call the disconnect-callback */
2599         /* from now on, no disconnect/probe callback should be running */
2600
2601         gigaset_freedriver(driver);
2602         driver = NULL;
2603 }
2604
2605
2606 module_init(bas_gigaset_init);
2607 module_exit(bas_gigaset_exit);
2608
2609 MODULE_AUTHOR(DRIVER_AUTHOR);
2610 MODULE_DESCRIPTION(DRIVER_DESC);
2611 MODULE_LICENSE("GPL");