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         struct work_struct      int_in_wq;      /* for usb_clear_halt() */
 113         struct timer_list       timer_int_in;   /* int read retry delay */
 114         int                     retry_int_in;
 115
 116         spinlock_t              lock;           /* locks all following */
 117         int                     basstate;       /* bitmap (BS_*) */
 118         int                     pending;        /* uncompleted base request */
 119         wait_queue_head_t       waitqueue;
 120         int                     rcvbuf_size;    /* size of AT receive buffer */
 121                                                 /* 0: no receive in progress */
 122         int                     retry_cmd_in;   /* receive req retry count */
 123 };
 124
 125 /* status of direct USB connection to 307x base (bits in basstate) */
 126 #define BS_ATOPEN       0x001   /* AT channel open */
 127 #define BS_B1OPEN       0x002   /* B channel 1 open */
 128 #define BS_B2OPEN       0x004   /* B channel 2 open */
 129 #define BS_ATREADY      0x008   /* base ready for AT command */
 130 #define BS_INIT         0x010   /* base has signalled INIT_OK */
 131 #define BS_ATTIMER      0x020   /* waiting for HD_READY_SEND_ATDATA */
 132 #define BS_ATRDPEND     0x040   /* urb_cmd_in in use */
 133 #define BS_ATWRPEND     0x080   /* urb_cmd_out in use */
 134 #define BS_SUSPEND      0x100   /* USB port suspended */
 135 #define BS_RESETTING    0x200   /* waiting for HD_RESET_INTERRUPT_PIPE_ACK */
 136
 137
 138 static struct gigaset_driver *driver;
 139
 140 /* usb specific object needed to register this driver with the usb subsystem */
 141 static struct usb_driver gigaset_usb_driver = {
 142         .name =         GIGASET_MODULENAME,
 143         .probe =        gigaset_probe,
 144         .disconnect =   gigaset_disconnect,
 145         .id_table =     gigaset_table,
 146         .suspend =      gigaset_suspend,
 147         .resume =       gigaset_resume,
 148         .reset_resume = gigaset_post_reset,
 149         .pre_reset =    gigaset_pre_reset,
 150         .post_reset =   gigaset_post_reset,
 151 };
 152
 153 /* get message text for usb_submit_urb return code
 154  */
 155 static char *get_usb_rcmsg(int rc)
 156 {
 157         static char unkmsg[28];
 158
 159         switch (rc) {
 160         case 0:
 161                 return "success";
 162         case -ENOMEM:
 163                 return "out of memory";
 164         case -ENODEV:
 165                 return "device not present";
 166         case -ENOENT:
 167                 return "endpoint not present";
 168         case -ENXIO:
 169                 return "URB type not supported";
 170         case -EINVAL:
 171                 return "invalid argument";
 172         case -EAGAIN:
 173                 return "start frame too early or too much scheduled";
 174         case -EFBIG:
 175                 return "too many isoc frames requested";
 176         case -EPIPE:
 177                 return "endpoint stalled";
 178         case -EMSGSIZE:
 179                 return "invalid packet size";
 180         case -ENOSPC:
 181                 return "would overcommit USB bandwidth";
 182         case -ESHUTDOWN:
 183                 return "device shut down";
 184         case -EPERM:
 185                 return "reject flag set";
 186         case -EHOSTUNREACH:
 187                 return "device suspended";
 188         default:
 189                 snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
 190                 return unkmsg;
 191         }
 192 }
 193
 194 /* get message text for USB status code
 195  */
 196 static char *get_usb_statmsg(int status)
 197 {
 198         static char unkmsg[28];
 199
 200         switch (status) {
 201         case 0:
 202                 return "success";
 203         case -ENOENT:
 204                 return "unlinked (sync)";
 205         case -EINPROGRESS:
 206                 return "URB still pending";
 207         case -EPROTO:
 208                 return "bitstuff error, timeout, or unknown USB error";
 209         case -EILSEQ:
 210                 return "CRC mismatch, timeout, or unknown USB error";
 211         case -ETIME:
 212                 return "USB response timeout";
 213         case -EPIPE:
 214                 return "endpoint stalled";
 215         case -ECOMM:
 216                 return "IN buffer overrun";
 217         case -ENOSR:
 218                 return "OUT buffer underrun";
 219         case -EOVERFLOW:
 220                 return "endpoint babble";
 221         case -EREMOTEIO:
 222                 return "short packet";
 223         case -ENODEV:
 224                 return "device removed";
 225         case -EXDEV:
 226                 return "partial isoc transfer";
 227         case -EINVAL:
 228                 return "ISO madness";
 229         case -ECONNRESET:
 230                 return "unlinked (async)";
 231         case -ESHUTDOWN:
 232                 return "device shut down";
 233         default:
 234                 snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
 235                 return unkmsg;
 236         }
 237 }
 238
 239 /* usb_pipetype_str
 240  * retrieve string representation of USB pipe type
 241  */
 242 static inline char *usb_pipetype_str(int pipe)
 243 {
 244         if (usb_pipeisoc(pipe))
 245                 return "Isoc";
 246         if (usb_pipeint(pipe))
 247                 return "Int";
 248         if (usb_pipecontrol(pipe))
 249                 return "Ctrl";
 250         if (usb_pipebulk(pipe))
 251                 return "Bulk";
 252         return "?";
 253 }
 254
 255 /* dump_urb
 256  * write content of URB to syslog for debugging
 257  */
 258 static inline void dump_urb(enum debuglevel level, const char *tag,
 259                             struct urb *urb)
 260 {
 261 #ifdef CONFIG_GIGASET_DEBUG
 262         int i;
 263         gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
 264         if (urb) {
 265                 gig_dbg(level,
 266                         "  dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
 267                         "hcpriv=0x%08lx, transfer_flags=0x%x,",
 268                         (unsigned long) urb->dev,
 269                         usb_pipetype_str(urb->pipe),
 270                         usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
 271                         usb_pipein(urb->pipe) ? "in" : "out",
 272                         (unsigned long) urb->hcpriv,
 273                         urb->transfer_flags);
 274                 gig_dbg(level,
 275                         "  transfer_buffer=0x%08lx[%d], actual_length=%d, "
 276                         "setup_packet=0x%08lx,",
 277                         (unsigned long) urb->transfer_buffer,
 278                         urb->transfer_buffer_length, urb->actual_length,
 279                         (unsigned long) urb->setup_packet);
 280                 gig_dbg(level,
 281                         "  start_frame=%d, number_of_packets=%d, interval=%d, "
 282                         "error_count=%d,",
 283                         urb->start_frame, urb->number_of_packets, urb->interval,
 284                         urb->error_count);
 285                 gig_dbg(level,
 286                         "  context=0x%08lx, complete=0x%08lx, "
 287                         "iso_frame_desc[]={",
 288                         (unsigned long) urb->context,
 289                         (unsigned long) urb->complete);
 290                 for (i = 0; i < urb->number_of_packets; i++) {
 291                         struct usb_iso_packet_descriptor *pifd
 292                                 = &urb->iso_frame_desc[i];
 293                         gig_dbg(level,
 294                                 "    {offset=%u, length=%u, actual_length=%u, "
 295                                 "status=%u}",
 296                                 pifd->offset, pifd->length, pifd->actual_length,
 297                                 pifd->status);
 298                 }
 299         }
 300         gig_dbg(level, "}}");
 301 #endif
 302 }
 303
 304 /* read/set modem control bits etc. (m10x only) */
 305 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
 306                                   unsigned new_state)
 307 {
 308         return -EINVAL;
 309 }
 310
 311 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
 312 {
 313         return -EINVAL;
 314 }
 315
 316 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
 317 {
 318         return -EINVAL;
 319 }
 320
 321 /* set/clear bits in base connection state, return previous state
 322  */
 323 static inline int update_basstate(struct bas_cardstate *ucs,
 324                                   int set, int clear)
 325 {
 326         unsigned long flags;
 327         int state;
 328
 329         spin_lock_irqsave(&ucs->lock, flags);
 330         state = ucs->basstate;
 331         ucs->basstate = (state & ~clear) | set;
 332         spin_unlock_irqrestore(&ucs->lock, flags);
 333         return state;
 334 }
 335
 336 /* error_hangup
 337  * hang up any existing connection because of an unrecoverable error
 338  * This function may be called from any context and takes care of scheduling
 339  * the necessary actions for execution outside of interrupt context.
 340  * cs->lock must not be held.
 341  * argument:
 342  *      B channel control structure
 343  */
 344 static inline void error_hangup(struct bc_state *bcs)
 345 {
 346         struct cardstate *cs = bcs->cs;
 347
 348         gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL);
 349         gigaset_schedule_event(cs);
 350 }
 351
 352 /* error_reset
 353  * reset Gigaset device because of an unrecoverable error
 354  * This function may be called from any context, and takes care of
 355  * scheduling the necessary actions for execution outside of interrupt context.
 356  * cs->hw.bas->lock must not be held.
 357  * argument:
 358  *      controller state structure
 359  */
 360 static inline void error_reset(struct cardstate *cs)
 361 {
 362         /* reset interrupt pipe to recover (ignore errors) */
 363         update_basstate(cs->hw.bas, BS_RESETTING, 0);
 364         if (req_submit(cs->bcs, HD_RESET_INTERRUPT_PIPE, 0, BAS_TIMEOUT))
 365                 /* submission failed, escalate to USB port reset */
 366                 usb_queue_reset_device(cs->hw.bas->interface);
 367 }
 368
 369 /* check_pending
 370  * check for completion of pending control request
 371  * parameter:
 372  *      ucs     hardware specific controller state structure
 373  */
 374 static void check_pending(struct bas_cardstate *ucs)
 375 {
 376         unsigned long flags;
 377
 378         spin_lock_irqsave(&ucs->lock, flags);
 379         switch (ucs->pending) {
 380         case 0:
 381                 break;
 382         case HD_OPEN_ATCHANNEL:
 383                 if (ucs->basstate & BS_ATOPEN)
 384                         ucs->pending = 0;
 385                 break;
 386         case HD_OPEN_B1CHANNEL:
 387                 if (ucs->basstate & BS_B1OPEN)
 388                         ucs->pending = 0;
 389                 break;
 390         case HD_OPEN_B2CHANNEL:
 391                 if (ucs->basstate & BS_B2OPEN)
 392                         ucs->pending = 0;
 393                 break;
 394         case HD_CLOSE_ATCHANNEL:
 395                 if (!(ucs->basstate & BS_ATOPEN))
 396                         ucs->pending = 0;
 397                 break;
 398         case HD_CLOSE_B1CHANNEL:
 399                 if (!(ucs->basstate & BS_B1OPEN))
 400                         ucs->pending = 0;
 401                 break;
 402         case HD_CLOSE_B2CHANNEL:
 403                 if (!(ucs->basstate & BS_B2OPEN))
 404                         ucs->pending = 0;
 405                 break;
 406         case HD_DEVICE_INIT_ACK:                /* no reply expected */
 407                 ucs->pending = 0;
 408                 break;
 409         case HD_RESET_INTERRUPT_PIPE:
 410                 if (!(ucs->basstate & BS_RESETTING))
 411                         ucs->pending = 0;
 412                 break;
 413         /*
 414          * HD_READ_ATMESSAGE and HD_WRITE_ATMESSAGE are handled separately
 415          * and should never end up here
 416          */
 417         default:
 418                 dev_warn(&ucs->interface->dev,
 419                          "unknown pending request 0x%02x cleared\n",
 420                          ucs->pending);
 421                 ucs->pending = 0;
 422         }
 423
 424         if (!ucs->pending)
 425                 del_timer(&ucs->timer_ctrl);
 426
 427         spin_unlock_irqrestore(&ucs->lock, flags);
 428 }
 429
 430 /* cmd_in_timeout
 431  * timeout routine for command input request
 432  * argument:
 433  *      controller state structure
 434  */
 435 static void cmd_in_timeout(unsigned long data)
 436 {
 437         struct cardstate *cs = (struct cardstate *) data;
 438         struct bas_cardstate *ucs = cs->hw.bas;
 439         int rc;
 440
 441         if (!ucs->rcvbuf_size) {
 442                 gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
 443                 return;
 444         }
 445
 446         if (ucs->retry_cmd_in++ >= BAS_RETRY) {
 447                 dev_err(cs->dev,
 448                         "control read: timeout, giving up after %d tries\n",
 449                         ucs->retry_cmd_in);
 450                 kfree(ucs->rcvbuf);
 451                 ucs->rcvbuf = NULL;
 452                 ucs->rcvbuf_size = 0;
 453                 error_reset(cs);
 454                 return;
 455         }
 456
 457         gig_dbg(DEBUG_USBREQ, "%s: timeout, retry %d",
 458                 __func__, ucs->retry_cmd_in);
 459         rc = atread_submit(cs, BAS_TIMEOUT);
 460         if (rc < 0) {
 461                 kfree(ucs->rcvbuf);
 462                 ucs->rcvbuf = NULL;
 463                 ucs->rcvbuf_size = 0;
 464                 if (rc != -ENODEV)
 465                         error_reset(cs);
 466         }
 467 }
 468
 469 /* read_ctrl_callback
 470  * USB completion handler for control pipe input
 471  * called by the USB subsystem in interrupt context
 472  * parameter:
 473  *      urb     USB request block
 474  *              urb->context = inbuf structure for controller state
 475  */
 476 static void read_ctrl_callback(struct urb *urb)
 477 {
 478         struct inbuf_t *inbuf = urb->context;
 479         struct cardstate *cs = inbuf->cs;
 480         struct bas_cardstate *ucs = cs->hw.bas;
 481         int status = urb->status;
 482         unsigned numbytes;
 483         int rc;
 484
 485         update_basstate(ucs, 0, BS_ATRDPEND);
 486         wake_up(&ucs->waitqueue);
 487         del_timer(&ucs->timer_cmd_in);
 488
 489         switch (status) {
 490         case 0:                         /* normal completion */
 491                 numbytes = urb->actual_length;
 492                 if (unlikely(numbytes != ucs->rcvbuf_size)) {
 493                         dev_warn(cs->dev,
 494                                "control read: received %d chars, expected %d\n",
 495                                  numbytes, ucs->rcvbuf_size);
 496                         if (numbytes > ucs->rcvbuf_size)
 497                                 numbytes = ucs->rcvbuf_size;
 498                 }
 499
 500                 /* copy received bytes to inbuf, notify event layer */
 501                 if (gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes)) {
 502                         gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
 503                         gigaset_schedule_event(cs);
 504                 }
 505                 break;
 506
 507         case -ENOENT:                   /* cancelled */
 508         case -ECONNRESET:               /* cancelled (async) */
 509         case -EINPROGRESS:              /* pending */
 510         case -ENODEV:                   /* device removed */
 511         case -ESHUTDOWN:                /* device shut down */
 512                 /* no further action necessary */
 513                 gig_dbg(DEBUG_USBREQ, "%s: %s",
 514                         __func__, get_usb_statmsg(status));
 515                 break;
 516
 517         default:                        /* other errors: retry */
 518                 if (ucs->retry_cmd_in++ < BAS_RETRY) {
 519                         gig_dbg(DEBUG_USBREQ, "%s: %s, retry %d", __func__,
 520                                 get_usb_statmsg(status), ucs->retry_cmd_in);
 521                         rc = atread_submit(cs, BAS_TIMEOUT);
 522                         if (rc >= 0)
 523                                 /* successfully resubmitted, skip freeing */
 524                                 return;
 525                         if (rc == -ENODEV)
 526                                 /* disconnect, no further action necessary */
 527                                 break;
 528                 }
 529                 dev_err(cs->dev, "control read: %s, giving up after %d tries\n",
 530                         get_usb_statmsg(status), ucs->retry_cmd_in);
 531                 error_reset(cs);
 532         }
 533
 534         /* read finished, free buffer */
 535         kfree(ucs->rcvbuf);
 536         ucs->rcvbuf = NULL;
 537         ucs->rcvbuf_size = 0;
 538 }
 539
 540 /* atread_submit
 541  * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
 542  * parameters:
 543  *      cs      controller state structure
 544  *      timeout timeout in 1/10 sec., 0: none
 545  * return value:
 546  *      0 on success
 547  *      -EBUSY if another request is pending
 548  *      any URB submission error code
 549  */
 550 static int atread_submit(struct cardstate *cs, int timeout)
 551 {
 552         struct bas_cardstate *ucs = cs->hw.bas;
 553         int basstate;
 554         int ret;
 555
 556         gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
 557                 ucs->rcvbuf_size);
 558
 559         basstate = update_basstate(ucs, BS_ATRDPEND, 0);
 560         if (basstate & BS_ATRDPEND) {
 561                 dev_err(cs->dev,
 562                         "could not submit HD_READ_ATMESSAGE: URB busy\n");
 563                 return -EBUSY;
 564         }
 565
 566         if (basstate & BS_SUSPEND) {
 567                 dev_notice(cs->dev,
 568                            "HD_READ_ATMESSAGE not submitted, "
 569                            "suspend in progress\n");
 570                 update_basstate(ucs, 0, BS_ATRDPEND);
 571                 /* treat like disconnect */
 572                 return -ENODEV;
 573         }
 574
 575         ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
 576         ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
 577         ucs->dr_cmd_in.wValue = 0;
 578         ucs->dr_cmd_in.wIndex = 0;
 579         ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
 580         usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
 581                              usb_rcvctrlpipe(ucs->udev, 0),
 582                              (unsigned char *) &ucs->dr_cmd_in,
 583                              ucs->rcvbuf, ucs->rcvbuf_size,
 584                              read_ctrl_callback, cs->inbuf);
 585
 586         ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC);
 587         if (ret != 0) {
 588                 update_basstate(ucs, 0, BS_ATRDPEND);
 589                 dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
 590                         get_usb_rcmsg(ret));
 591                 return ret;
 592         }
 593
 594         if (timeout > 0) {
 595                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
 596                 mod_timer(&ucs->timer_cmd_in, jiffies + timeout * HZ / 10);
 597         }
 598         return 0;
 599 }
 600
 601 /* int_in_work
 602  * workqueue routine to clear halt on interrupt in endpoint
 603  */
 604
 605 static void int_in_work(struct work_struct *work)
 606 {
 607         struct bas_cardstate *ucs =
 608                 container_of(work, struct bas_cardstate, int_in_wq);
 609         struct urb *urb = ucs->urb_int_in;
 610         struct cardstate *cs = urb->context;
 611         int rc;
 612
 613         /* clear halt condition */
 614         rc = usb_clear_halt(ucs->udev, urb->pipe);
 615         gig_dbg(DEBUG_USBREQ, "clear_halt: %s", get_usb_rcmsg(rc));
 616         if (rc == 0)
 617                 /* success, resubmit interrupt read URB */
 618                 rc = usb_submit_urb(urb, GFP_ATOMIC);
 619
 620         switch (rc) {
 621         case 0:         /* success */
 622         case -ENODEV:   /* device gone */
 623         case -EINVAL:   /* URB already resubmitted, or terminal badness */
 624                 break;
 625         default:        /* failure: try to recover by resetting the device */
 626                 dev_err(cs->dev, "clear halt failed: %s\n", get_usb_rcmsg(rc));
 627                 rc = usb_lock_device_for_reset(ucs->udev, ucs->interface);
 628                 if (rc == 0) {
 629                         rc = usb_reset_device(ucs->udev);
 630                         usb_unlock_device(ucs->udev);
 631                 }
 632         }
 633         ucs->retry_int_in = 0;
 634 }
 635
 636 /* int_in_resubmit
 637  * timer routine for interrupt read delayed resubmit
 638  * argument:
 639  *      controller state structure
 640  */
 641 static void int_in_resubmit(unsigned long data)
 642 {
 643         struct cardstate *cs = (struct cardstate *) data;
 644         struct bas_cardstate *ucs = cs->hw.bas;
 645         int rc;
 646
 647         if (ucs->retry_int_in++ >= BAS_RETRY) {
 648                 dev_err(cs->dev, "interrupt read: giving up after %d tries\n",
 649                         ucs->retry_int_in);
 650                 usb_queue_reset_device(ucs->interface);
 651                 return;
 652         }
 653
 654         gig_dbg(DEBUG_USBREQ, "%s: retry %d", __func__, ucs->retry_int_in);
 655         rc = usb_submit_urb(ucs->urb_int_in, GFP_ATOMIC);
 656         if (rc != 0 && rc != -ENODEV) {
 657                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
 658                         get_usb_rcmsg(rc));
 659                 usb_queue_reset_device(ucs->interface);
 660         }
 661 }
 662
 663 /* read_int_callback
 664  * USB completion handler for interrupt pipe input
 665  * called by the USB subsystem in interrupt context
 666  * parameter:
 667  *      urb     USB request block
 668  *              urb->context = controller state structure
 669  */
 670 static void read_int_callback(struct urb *urb)
 671 {
 672         struct cardstate *cs = urb->context;
 673         struct bas_cardstate *ucs = cs->hw.bas;
 674         struct bc_state *bcs;
 675         int status = urb->status;
 676         unsigned long flags;
 677         int rc;
 678         unsigned l;
 679         int channel;
 680
 681         switch (status) {
 682         case 0:                 /* success */
 683                 ucs->retry_int_in = 0;
 684                 break;
 685         case -EPIPE:                    /* endpoint stalled */
 686                 schedule_work(&ucs->int_in_wq);
 687                 /* fall through */
 688         case -ENOENT:                   /* cancelled */
 689         case -ECONNRESET:               /* cancelled (async) */
 690         case -EINPROGRESS:              /* pending */
 691         case -ENODEV:                   /* device removed */
 692         case -ESHUTDOWN:                /* device shut down */
 693                 /* no further action necessary */
 694                 gig_dbg(DEBUG_USBREQ, "%s: %s",
 695                         __func__, get_usb_statmsg(status));
 696                 return;
 697         case -EPROTO:                   /* protocol error or unplug */
 698         case -EILSEQ:
 699         case -ETIME:
 700                 /* resubmit after delay */
 701                 gig_dbg(DEBUG_USBREQ, "%s: %s",
 702                         __func__, get_usb_statmsg(status));
 703                 mod_timer(&ucs->timer_int_in, jiffies + HZ / 10);
 704                 return;
 705         default:                /* other errors: just resubmit */
 706                 dev_warn(cs->dev, "interrupt read: %s\n",
 707                          get_usb_statmsg(status));
 708                 goto resubmit;
 709         }
 710
 711         /* drop incomplete packets even if the missing bytes wouldn't matter */
 712         if (unlikely(urb->actual_length < IP_MSGSIZE)) {
 713                 dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
 714                          urb->actual_length);
 715                 goto resubmit;
 716         }
 717
 718         l = (unsigned) ucs->int_in_buf[1] +
 719             (((unsigned) ucs->int_in_buf[2]) << 8);
 720
 721         gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
 722                 urb->actual_length, (int)ucs->int_in_buf[0], l,
 723                 (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
 724
 725         channel = 0;
 726
 727         switch (ucs->int_in_buf[0]) {
 728         case HD_DEVICE_INIT_OK:
 729                 update_basstate(ucs, BS_INIT, 0);
 730                 break;
 731
 732         case HD_READY_SEND_ATDATA:
 733                 del_timer(&ucs->timer_atrdy);
 734                 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
 735                 start_cbsend(cs);
 736                 break;
 737
 738         case HD_OPEN_B2CHANNEL_ACK:
 739                 ++channel;
 740         case HD_OPEN_B1CHANNEL_ACK:
 741                 bcs = cs->bcs + channel;
 742                 update_basstate(ucs, BS_B1OPEN << channel, 0);
 743                 gigaset_bchannel_up(bcs);
 744                 break;
 745
 746         case HD_OPEN_ATCHANNEL_ACK:
 747                 update_basstate(ucs, BS_ATOPEN, 0);
 748                 start_cbsend(cs);
 749                 break;
 750
 751         case HD_CLOSE_B2CHANNEL_ACK:
 752                 ++channel;
 753         case HD_CLOSE_B1CHANNEL_ACK:
 754                 bcs = cs->bcs + channel;
 755                 update_basstate(ucs, 0, BS_B1OPEN << channel);
 756                 stopurbs(bcs->hw.bas);
 757                 gigaset_bchannel_down(bcs);
 758                 break;
 759
 760         case HD_CLOSE_ATCHANNEL_ACK:
 761                 update_basstate(ucs, 0, BS_ATOPEN);
 762                 break;
 763
 764         case HD_B2_FLOW_CONTROL:
 765                 ++channel;
 766         case HD_B1_FLOW_CONTROL:
 767                 bcs = cs->bcs + channel;
 768                 atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
 769                            &bcs->hw.bas->corrbytes);
 770                 gig_dbg(DEBUG_ISO,
 771                         "Flow control (channel %d, sub %d): 0x%02x => %d",
 772                         channel, bcs->hw.bas->numsub, l,
 773                         atomic_read(&bcs->hw.bas->corrbytes));
 774                 break;
 775
 776         case HD_RECEIVEATDATA_ACK:      /* AT response ready to be received */
 777                 if (!l) {
 778                         dev_warn(cs->dev,
 779                                 "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
 780                         break;
 781                 }
 782                 spin_lock_irqsave(&cs->lock, flags);
 783                 if (ucs->basstate & BS_ATRDPEND) {
 784                         spin_unlock_irqrestore(&cs->lock, flags);
 785                         dev_warn(cs->dev,
 786         "HD_RECEIVEATDATA_ACK(%d) during HD_READ_ATMESSAGE(%d) ignored\n",
 787                                  l, ucs->rcvbuf_size);
 788                         break;
 789                 }
 790                 if (ucs->rcvbuf_size) {
 791                         /* throw away previous buffer - we have no queue */
 792                         dev_err(cs->dev,
 793                                 "receive AT data overrun, %d bytes lost\n",
 794                                 ucs->rcvbuf_size);
 795                         kfree(ucs->rcvbuf);
 796                         ucs->rcvbuf_size = 0;
 797                 }
 798                 ucs->rcvbuf = kmalloc(l, GFP_ATOMIC);
 799                 if (ucs->rcvbuf == NULL) {
 800                         spin_unlock_irqrestore(&cs->lock, flags);
 801                         dev_err(cs->dev, "out of memory receiving AT data\n");
 802                         break;
 803                 }
 804                 ucs->rcvbuf_size = l;
 805                 ucs->retry_cmd_in = 0;
 806                 rc = atread_submit(cs, BAS_TIMEOUT);
 807                 if (rc < 0) {
 808                         kfree(ucs->rcvbuf);
 809                         ucs->rcvbuf = NULL;
 810                         ucs->rcvbuf_size = 0;
 811                 }
 812                 spin_unlock_irqrestore(&cs->lock, flags);
 813                 if (rc < 0 && rc != -ENODEV)
 814                         error_reset(cs);
 815                 break;
 816
 817         case HD_RESET_INTERRUPT_PIPE_ACK:
 818                 update_basstate(ucs, 0, BS_RESETTING);
 819                 dev_notice(cs->dev, "interrupt pipe reset\n");
 820                 break;
 821
 822         case HD_SUSPEND_END:
 823                 gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
 824                 break;
 825
 826         default:
 827                 dev_warn(cs->dev,
 828                          "unknown Gigaset signal 0x%02x (%u) ignored\n",
 829                          (int) ucs->int_in_buf[0], l);
 830         }
 831
 832         check_pending(ucs);
 833         wake_up(&ucs->waitqueue);
 834
 835 resubmit:
 836         rc = usb_submit_urb(urb, GFP_ATOMIC);
 837         if (unlikely(rc != 0 && rc != -ENODEV)) {
 838                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
 839                         get_usb_rcmsg(rc));
 840                 error_reset(cs);
 841         }
 842 }
 843
 844 /* read_iso_callback
 845  * USB completion handler for B channel isochronous input
 846  * called by the USB subsystem in interrupt context
 847  * parameter:
 848  *      urb     USB request block of completed request
 849  *              urb->context = bc_state structure
 850  */
 851 static void read_iso_callback(struct urb *urb)
 852 {
 853         struct bc_state *bcs;
 854         struct bas_bc_state *ubc;
 855         int status = urb->status;
 856         unsigned long flags;
 857         int i, rc;
 858
 859         /* status codes not worth bothering the tasklet with */
 860         if (unlikely(status == -ENOENT ||
 861                      status == -ECONNRESET ||
 862                      status == -EINPROGRESS ||
 863                      status == -ENODEV ||
 864                      status == -ESHUTDOWN)) {
 865                 gig_dbg(DEBUG_ISO, "%s: %s",
 866                         __func__, get_usb_statmsg(status));
 867                 return;
 868         }
 869
 870         bcs = urb->context;
 871         ubc = bcs->hw.bas;
 872
 873         spin_lock_irqsave(&ubc->isoinlock, flags);
 874         if (likely(ubc->isoindone == NULL)) {
 875                 /* pass URB to tasklet */
 876                 ubc->isoindone = urb;
 877                 ubc->isoinstatus = status;
 878                 tasklet_hi_schedule(&ubc->rcvd_tasklet);
 879         } else {
 880                 /* tasklet still busy, drop data and resubmit URB */
 881                 gig_dbg(DEBUG_ISO, "%s: overrun", __func__);
 882                 ubc->loststatus = status;
 883                 for (i = 0; i < BAS_NUMFRAMES; i++) {
 884                         ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
 885                         if (unlikely(urb->iso_frame_desc[i].status != 0 &&
 886                                      urb->iso_frame_desc[i].status !=
 887                                                                 -EINPROGRESS))
 888                                 ubc->loststatus = urb->iso_frame_desc[i].status;
 889                         urb->iso_frame_desc[i].status = 0;
 890                         urb->iso_frame_desc[i].actual_length = 0;
 891                 }
 892                 if (likely(ubc->running)) {
 893                         /* urb->dev is clobbered by USB subsystem */
 894                         urb->dev = bcs->cs->hw.bas->udev;
 895                         urb->transfer_flags = URB_ISO_ASAP;
 896                         urb->number_of_packets = BAS_NUMFRAMES;
 897                         rc = usb_submit_urb(urb, GFP_ATOMIC);
 898                         if (unlikely(rc != 0 && rc != -ENODEV)) {
 899                                 dev_err(bcs->cs->dev,
 900                                        "could not resubmit isoc read URB: %s\n",
 901                                         get_usb_rcmsg(rc));
 902                                 dump_urb(DEBUG_ISO, "isoc read", urb);
 903                                 error_hangup(bcs);
 904                         }
 905                 }
 906         }
 907         spin_unlock_irqrestore(&ubc->isoinlock, flags);
 908 }
 909
 910 /* write_iso_callback
 911  * USB completion handler for B channel isochronous output
 912  * called by the USB subsystem in interrupt context
 913  * parameter:
 914  *      urb     USB request block of completed request
 915  *              urb->context = isow_urbctx_t structure
 916  */
 917 static void write_iso_callback(struct urb *urb)
 918 {
 919         struct isow_urbctx_t *ucx;
 920         struct bas_bc_state *ubc;
 921         int status = urb->status;
 922         unsigned long flags;
 923
 924         /* status codes not worth bothering the tasklet with */
 925         if (unlikely(status == -ENOENT ||
 926                      status == -ECONNRESET ||
 927                      status == -EINPROGRESS ||
 928                      status == -ENODEV ||
 929                      status == -ESHUTDOWN)) {
 930                 gig_dbg(DEBUG_ISO, "%s: %s",
 931                         __func__, get_usb_statmsg(status));
 932                 return;
 933         }
 934
 935         /* pass URB context to tasklet */
 936         ucx = urb->context;
 937         ubc = ucx->bcs->hw.bas;
 938         ucx->status = status;
 939
 940         spin_lock_irqsave(&ubc->isooutlock, flags);
 941         ubc->isooutovfl = ubc->isooutdone;
 942         ubc->isooutdone = ucx;
 943         spin_unlock_irqrestore(&ubc->isooutlock, flags);
 944         tasklet_hi_schedule(&ubc->sent_tasklet);
 945 }
 946
 947 /* starturbs
 948  * prepare and submit USB request blocks for isochronous input and output
 949  * argument:
 950  *      B channel control structure
 951  * return value:
 952  *      0 on success
 953  *      < 0 on error (no URBs submitted)
 954  */
 955 static int starturbs(struct bc_state *bcs)
 956 {
 957         struct bas_bc_state *ubc = bcs->hw.bas;
 958         struct urb *urb;
 959         int j, k;
 960         int rc;
 961
 962         /* initialize L2 reception */
 963         if (bcs->proto2 == L2_HDLC)
 964                 bcs->inputstate |= INS_flag_hunt;
 965
 966         /* submit all isochronous input URBs */
 967         ubc->running = 1;
 968         for (k = 0; k < BAS_INURBS; k++) {
 969                 urb = ubc->isoinurbs[k];
 970                 if (!urb) {
 971                         rc = -EFAULT;
 972                         goto error;
 973                 }
 974
 975                 urb->dev = bcs->cs->hw.bas->udev;
 976                 urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
 977                 urb->transfer_flags = URB_ISO_ASAP;
 978                 urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
 979                 urb->transfer_buffer_length = BAS_INBUFSIZE;
 980                 urb->number_of_packets = BAS_NUMFRAMES;
 981                 urb->interval = BAS_FRAMETIME;
 982                 urb->complete = read_iso_callback;
 983                 urb->context = bcs;
 984                 for (j = 0; j < BAS_NUMFRAMES; j++) {
 985                         urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
 986                         urb->iso_frame_desc[j].length = BAS_MAXFRAME;
 987                         urb->iso_frame_desc[j].status = 0;
 988                         urb->iso_frame_desc[j].actual_length = 0;
 989                 }
 990
 991                 dump_urb(DEBUG_ISO, "Initial isoc read", urb);
 992                 rc = usb_submit_urb(urb, GFP_ATOMIC);
 993                 if (rc != 0)
 994                         goto error;
 995         }
 996
 997         /* initialize L2 transmission */
 998         gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
 999
1000         /* set up isochronous output URBs for flag idling */
1001         for (k = 0; k < BAS_OUTURBS; ++k) {
1002                 urb = ubc->isoouturbs[k].urb;
1003                 if (!urb) {
1004                         rc = -EFAULT;
1005                         goto error;
1006                 }
1007                 urb->dev = bcs->cs->hw.bas->udev;
1008                 urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
1009                 urb->transfer_flags = URB_ISO_ASAP;
1010                 urb->transfer_buffer = ubc->isooutbuf->data;
1011                 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1012                 urb->number_of_packets = BAS_NUMFRAMES;
1013                 urb->interval = BAS_FRAMETIME;
1014                 urb->complete = write_iso_callback;
1015                 urb->context = &ubc->isoouturbs[k];
1016                 for (j = 0; j < BAS_NUMFRAMES; ++j) {
1017                         urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
1018                         urb->iso_frame_desc[j].length = BAS_NORMFRAME;
1019                         urb->iso_frame_desc[j].status = 0;
1020                         urb->iso_frame_desc[j].actual_length = 0;
1021                 }
1022                 ubc->isoouturbs[k].limit = -1;
1023         }
1024
1025         /* keep one URB free, submit the others */
1026         for (k = 0; k < BAS_OUTURBS-1; ++k) {
1027                 dump_urb(DEBUG_ISO, "Initial isoc write", urb);
1028                 rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
1029                 if (rc != 0)
1030                         goto error;
1031         }
1032         dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
1033         ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS-1];
1034         ubc->isooutdone = ubc->isooutovfl = NULL;
1035         return 0;
1036  error:
1037         stopurbs(ubc);
1038         return rc;
1039 }
1040
1041 /* stopurbs
1042  * cancel the USB request blocks for isochronous input and output
1043  * errors are silently ignored
1044  * argument:
1045  *      B channel control structure
1046  */
1047 static void stopurbs(struct bas_bc_state *ubc)
1048 {
1049         int k, rc;
1050
1051         ubc->running = 0;
1052
1053         for (k = 0; k < BAS_INURBS; ++k) {
1054                 rc = usb_unlink_urb(ubc->isoinurbs[k]);
1055                 gig_dbg(DEBUG_ISO,
1056                         "%s: isoc input URB %d unlinked, result = %s",
1057                         __func__, k, get_usb_rcmsg(rc));
1058         }
1059
1060         for (k = 0; k < BAS_OUTURBS; ++k) {
1061                 rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
1062                 gig_dbg(DEBUG_ISO,
1063                         "%s: isoc output URB %d unlinked, result = %s",
1064                         __func__, k, get_usb_rcmsg(rc));
1065         }
1066 }
1067
1068 /* Isochronous Write - Bottom Half */
1069 /* =============================== */
1070
1071 /* submit_iso_write_urb
1072  * fill and submit the next isochronous write URB
1073  * parameters:
1074  *      ucx     context structure containing URB
1075  * return value:
1076  *      number of frames submitted in URB
1077  *      0 if URB not submitted because no data available (isooutbuf busy)
1078  *      error code < 0 on error
1079  */
1080 static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
1081 {
1082         struct urb *urb = ucx->urb;
1083         struct bas_bc_state *ubc = ucx->bcs->hw.bas;
1084         struct usb_iso_packet_descriptor *ifd;
1085         int corrbytes, nframe, rc;
1086
1087         /* urb->dev is clobbered by USB subsystem */
1088         urb->dev = ucx->bcs->cs->hw.bas->udev;
1089         urb->transfer_flags = URB_ISO_ASAP;
1090         urb->transfer_buffer = ubc->isooutbuf->data;
1091         urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1092
1093         for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
1094                 ifd = &urb->iso_frame_desc[nframe];
1095
1096                 /* compute frame length according to flow control */
1097                 ifd->length = BAS_NORMFRAME;
1098                 corrbytes = atomic_read(&ubc->corrbytes);
1099                 if (corrbytes != 0) {
1100                         gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
1101                                 __func__, corrbytes);
1102                         if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
1103                                 corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
1104                         else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
1105                                 corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
1106                         ifd->length += corrbytes;
1107                         atomic_add(-corrbytes, &ubc->corrbytes);
1108                 }
1109
1110                 /* retrieve block of data to send */
1111                 rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
1112                 if (rc < 0) {
1113                         if (rc == -EBUSY) {
1114                                 gig_dbg(DEBUG_ISO,
1115                                         "%s: buffer busy at frame %d",
1116                                         __func__, nframe);
1117                                 /* tasklet will be restarted from
1118                                    gigaset_isoc_send_skb() */
1119                         } else {
1120                                 dev_err(ucx->bcs->cs->dev,
1121                                         "%s: buffer error %d at frame %d\n",
1122                                         __func__, rc, nframe);
1123                                 return rc;
1124                         }
1125                         break;
1126                 }
1127                 ifd->offset = rc;
1128                 ucx->limit = ubc->isooutbuf->nextread;
1129                 ifd->status = 0;
1130                 ifd->actual_length = 0;
1131         }
1132         if (unlikely(nframe == 0))
1133                 return 0;       /* no data to send */
1134         urb->number_of_packets = nframe;
1135
1136         rc = usb_submit_urb(urb, GFP_ATOMIC);
1137         if (unlikely(rc)) {
1138                 if (rc == -ENODEV)
1139                         /* device removed - give up silently */
1140                         gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
1141                 else
1142                         dev_err(ucx->bcs->cs->dev,
1143                                 "could not submit isoc write URB: %s\n",
1144                                 get_usb_rcmsg(rc));
1145                 return rc;
1146         }
1147         ++ubc->numsub;
1148         return nframe;
1149 }
1150
1151 /* write_iso_tasklet
1152  * tasklet scheduled when an isochronous output URB from the Gigaset device
1153  * has completed
1154  * parameter:
1155  *      data    B channel state structure
1156  */
1157 static void write_iso_tasklet(unsigned long data)
1158 {
1159         struct bc_state *bcs = (struct bc_state *) data;
1160         struct bas_bc_state *ubc = bcs->hw.bas;
1161         struct cardstate *cs = bcs->cs;
1162         struct isow_urbctx_t *done, *next, *ovfl;
1163         struct urb *urb;
1164         int status;
1165         struct usb_iso_packet_descriptor *ifd;
1166         unsigned long flags;
1167         int i;
1168         struct sk_buff *skb;
1169         int len;
1170         int rc;
1171
1172         /* loop while completed URBs arrive in time */
1173         for (;;) {
1174                 if (unlikely(!(ubc->running))) {
1175                         gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1176                         return;
1177                 }
1178
1179                 /* retrieve completed URBs */
1180                 spin_lock_irqsave(&ubc->isooutlock, flags);
1181                 done = ubc->isooutdone;
1182                 ubc->isooutdone = NULL;
1183                 ovfl = ubc->isooutovfl;
1184                 ubc->isooutovfl = NULL;
1185                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1186                 if (ovfl) {
1187                         dev_err(cs->dev, "isoc write underrun\n");
1188                         error_hangup(bcs);
1189                         break;
1190                 }
1191                 if (!done)
1192                         break;
1193
1194                 /* submit free URB if available */
1195                 spin_lock_irqsave(&ubc->isooutlock, flags);
1196                 next = ubc->isooutfree;
1197                 ubc->isooutfree = NULL;
1198                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1199                 if (next) {
1200                         rc = submit_iso_write_urb(next);
1201                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1202                                 /* could not submit URB, put it back */
1203                                 spin_lock_irqsave(&ubc->isooutlock, flags);
1204                                 if (ubc->isooutfree == NULL) {
1205                                         ubc->isooutfree = next;
1206                                         next = NULL;
1207                                 }
1208                                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1209                                 if (next) {
1210                                         /* couldn't put it back */
1211                                         dev_err(cs->dev,
1212                                                 "losing isoc write URB\n");
1213                                         error_hangup(bcs);
1214                                 }
1215                         }
1216                 }
1217
1218                 /* process completed URB */
1219                 urb = done->urb;
1220                 status = done->status;
1221                 switch (status) {
1222                 case -EXDEV:                    /* partial completion */
1223                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1224                                 __func__);
1225                         /* fall through - what's the difference anyway? */
1226                 case 0:                         /* normal completion */
1227                         /* inspect individual frames
1228                          * assumptions (for lack of documentation):
1229                          * - actual_length bytes of first frame in error are
1230                          *   successfully sent
1231                          * - all following frames are not sent at all
1232                          */
1233                         for (i = 0; i < BAS_NUMFRAMES; i++) {
1234                                 ifd = &urb->iso_frame_desc[i];
1235                                 if (ifd->status ||
1236                                     ifd->actual_length != ifd->length) {
1237                                         dev_warn(cs->dev,
1238                                             "isoc write: frame %d[%d/%d]: %s\n",
1239                                                  i, ifd->actual_length,
1240                                                  ifd->length,
1241                                                  get_usb_statmsg(ifd->status));
1242                                         break;
1243                                 }
1244                         }
1245                         break;
1246                 case -EPIPE:                    /* stall - probably underrun */
1247                         dev_err(cs->dev, "isoc write: stalled\n");
1248                         error_hangup(bcs);
1249                         break;
1250                 default:                        /* other errors */
1251                         dev_warn(cs->dev, "isoc write: %s\n",
1252                                  get_usb_statmsg(status));
1253                 }
1254
1255                 /* mark the write buffer area covered by this URB as free */
1256                 if (done->limit >= 0)
1257                         ubc->isooutbuf->read = done->limit;
1258
1259                 /* mark URB as free */
1260                 spin_lock_irqsave(&ubc->isooutlock, flags);
1261                 next = ubc->isooutfree;
1262                 ubc->isooutfree = done;
1263                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1264                 if (next) {
1265                         /* only one URB still active - resubmit one */
1266                         rc = submit_iso_write_urb(next);
1267                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1268                                 /* couldn't submit */
1269                                 error_hangup(bcs);
1270                         }
1271                 }
1272         }
1273
1274         /* process queued SKBs */
1275         while ((skb = skb_dequeue(&bcs->squeue))) {
1276                 /* copy to output buffer, doing L2 encapsulation */
1277                 len = skb->len;
1278                 if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
1279                         /* insufficient buffer space, push back onto queue */
1280                         skb_queue_head(&bcs->squeue, skb);
1281                         gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
1282                                 __func__, skb_queue_len(&bcs->squeue));
1283                         break;
1284                 }
1285                 skb_pull(skb, len);
1286                 gigaset_skb_sent(bcs, skb);
1287                 dev_kfree_skb_any(skb);
1288         }
1289 }
1290
1291 /* Isochronous Read - Bottom Half */
1292 /* ============================== */
1293
1294 /* read_iso_tasklet
1295  * tasklet scheduled when an isochronous input URB from the Gigaset device
1296  * has completed
1297  * parameter:
1298  *      data    B channel state structure
1299  */
1300 static void read_iso_tasklet(unsigned long data)
1301 {
1302         struct bc_state *bcs = (struct bc_state *) data;
1303         struct bas_bc_state *ubc = bcs->hw.bas;
1304         struct cardstate *cs = bcs->cs;
1305         struct urb *urb;
1306         int status;
1307         struct usb_iso_packet_descriptor *ifd;
1308         char *rcvbuf;
1309         unsigned long flags;
1310         int totleft, numbytes, offset, frame, rc;
1311
1312         /* loop while more completed URBs arrive in the meantime */
1313         for (;;) {
1314                 /* retrieve URB */
1315                 spin_lock_irqsave(&ubc->isoinlock, flags);
1316                 urb = ubc->isoindone;
1317                 if (!urb) {
1318                         spin_unlock_irqrestore(&ubc->isoinlock, flags);
1319                         return;
1320                 }
1321                 status = ubc->isoinstatus;
1322                 ubc->isoindone = NULL;
1323                 if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1324                         dev_warn(cs->dev,
1325                 "isoc read overrun, URB dropped (status: %s, %d bytes)\n",
1326                                  get_usb_statmsg(ubc->loststatus),
1327                                  ubc->isoinlost);
1328                         ubc->loststatus = -EINPROGRESS;
1329                 }
1330                 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1331
1332                 if (unlikely(!(ubc->running))) {
1333                         gig_dbg(DEBUG_ISO,
1334                                 "%s: channel not running, "
1335                                 "dropped URB with status: %s",
1336                                 __func__, get_usb_statmsg(status));
1337                         return;
1338                 }
1339
1340                 switch (status) {
1341                 case 0:                         /* normal completion */
1342                         break;
1343                 case -EXDEV:                    /* inspect individual frames
1344                                                    (we do that anyway) */
1345                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1346                                 __func__);
1347                         break;
1348                 case -ENOENT:
1349                 case -ECONNRESET:
1350                 case -EINPROGRESS:
1351                         gig_dbg(DEBUG_ISO, "%s: %s",
1352                                 __func__, get_usb_statmsg(status));
1353                         continue;               /* -> skip */
1354                 case -EPIPE:
1355                         dev_err(cs->dev, "isoc read: stalled\n");
1356                         error_hangup(bcs);
1357                         continue;               /* -> skip */
1358                 default:                        /* other error */
1359                         dev_warn(cs->dev, "isoc read: %s\n",
1360                                  get_usb_statmsg(status));
1361                         goto error;
1362                 }
1363
1364                 rcvbuf = urb->transfer_buffer;
1365                 totleft = urb->actual_length;
1366                 for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1367                         ifd = &urb->iso_frame_desc[frame];
1368                         numbytes = ifd->actual_length;
1369                         switch (ifd->status) {
1370                         case 0:                 /* success */
1371                                 break;
1372                         case -EPROTO:           /* protocol error or unplug */
1373                         case -EILSEQ:
1374                         case -ETIME:
1375                                 /* probably just disconnected, ignore */
1376                                 gig_dbg(DEBUG_ISO,
1377                                         "isoc read: frame %d[%d]: %s\n",
1378                                         frame, numbytes,
1379                                         get_usb_statmsg(ifd->status));
1380                                 break;
1381                         default:                /* other error */
1382                                 /* report, assume transferred bytes are ok */
1383                                 dev_warn(cs->dev,
1384                                          "isoc read: frame %d[%d]: %s\n",
1385                                          frame, numbytes,
1386                                          get_usb_statmsg(ifd->status));
1387                         }
1388                         if (unlikely(numbytes > BAS_MAXFRAME))
1389                                 dev_warn(cs->dev,
1390                                          "isoc read: frame %d[%d]: %s\n",
1391                                          frame, numbytes,
1392                                          "exceeds max frame size");
1393                         if (unlikely(numbytes > totleft)) {
1394                                 dev_warn(cs->dev,
1395                                          "isoc read: frame %d[%d]: %s\n",
1396                                          frame, numbytes,
1397                                          "exceeds total transfer length");
1398                                 numbytes = totleft;
1399                         }
1400                         offset = ifd->offset;
1401                         if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1402                                 dev_warn(cs->dev,
1403                                          "isoc read: frame %d[%d]: %s\n",
1404                                          frame, numbytes,
1405                                          "exceeds end of buffer");
1406                                 numbytes = BAS_INBUFSIZE - offset;
1407                         }
1408                         gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1409                         totleft -= numbytes;
1410                 }
1411                 if (unlikely(totleft > 0))
1412                         dev_warn(cs->dev, "isoc read: %d data bytes missing\n",
1413                                  totleft);
1414
1415 error:
1416                 /* URB processed, resubmit */
1417                 for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1418                         urb->iso_frame_desc[frame].status = 0;
1419                         urb->iso_frame_desc[frame].actual_length = 0;
1420                 }
1421                 /* urb->dev is clobbered by USB subsystem */
1422                 urb->dev = bcs->cs->hw.bas->udev;
1423                 urb->transfer_flags = URB_ISO_ASAP;
1424                 urb->number_of_packets = BAS_NUMFRAMES;
1425                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1426                 if (unlikely(rc != 0 && rc != -ENODEV)) {
1427                         dev_err(cs->dev,
1428                                 "could not resubmit isoc read URB: %s\n",
1429                                 get_usb_rcmsg(rc));
1430                         dump_urb(DEBUG_ISO, "resubmit isoc read", urb);
1431                         error_hangup(bcs);
1432                 }
1433         }
1434 }
1435
1436 /* Channel Operations */
1437 /* ================== */
1438
1439 /* req_timeout
1440  * timeout routine for control output request
1441  * argument:
1442  *      controller state structure
1443  */
1444 static void req_timeout(unsigned long data)
1445 {
1446         struct cardstate *cs = (struct cardstate *) data;
1447         struct bas_cardstate *ucs = cs->hw.bas;
1448         int pending;
1449         unsigned long flags;
1450
1451         check_pending(ucs);
1452
1453         spin_lock_irqsave(&ucs->lock, flags);
1454         pending = ucs->pending;
1455         ucs->pending = 0;
1456         spin_unlock_irqrestore(&ucs->lock, flags);
1457
1458         switch (pending) {
1459         case 0:                                 /* no pending request */
1460                 gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1461                 break;
1462
1463         case HD_OPEN_ATCHANNEL:
1464                 dev_err(cs->dev, "timeout opening AT channel\n");
1465                 error_reset(cs);
1466                 break;
1467
1468         case HD_OPEN_B1CHANNEL:
1469                 dev_err(cs->dev, "timeout opening channel 1\n");
1470                 error_hangup(&cs->bcs[0]);
1471                 break;
1472
1473         case HD_OPEN_B2CHANNEL:
1474                 dev_err(cs->dev, "timeout opening channel 2\n");
1475                 error_hangup(&cs->bcs[1]);
1476                 break;
1477
1478         case HD_CLOSE_ATCHANNEL:
1479                 dev_err(cs->dev, "timeout closing AT channel\n");
1480                 error_reset(cs);
1481                 break;
1482
1483         case HD_CLOSE_B1CHANNEL:
1484                 dev_err(cs->dev, "timeout closing channel 1\n");
1485                 error_reset(cs);
1486                 break;
1487
1488         case HD_CLOSE_B2CHANNEL:
1489                 dev_err(cs->dev, "timeout closing channel 2\n");
1490                 error_reset(cs);
1491                 break;
1492
1493         case HD_RESET_INTERRUPT_PIPE:
1494                 /* error recovery escalation */
1495                 dev_err(cs->dev,
1496                         "reset interrupt pipe timeout, attempting USB reset\n");
1497                 usb_queue_reset_device(ucs->interface);
1498                 break;
1499
1500         default:
1501                 dev_warn(cs->dev, "request 0x%02x timed out, clearing\n",
1502                          pending);
1503         }
1504
1505         wake_up(&ucs->waitqueue);
1506 }
1507
1508 /* write_ctrl_callback
1509  * USB completion handler for control pipe output
1510  * called by the USB subsystem in interrupt context
1511  * parameter:
1512  *      urb     USB request block of completed request
1513  *              urb->context = hardware specific controller state structure
1514  */
1515 static void write_ctrl_callback(struct urb *urb)
1516 {
1517         struct bas_cardstate *ucs = urb->context;
1518         int status = urb->status;
1519         int rc;
1520         unsigned long flags;
1521
1522         /* check status */
1523         switch (status) {
1524         case 0:                                 /* normal completion */
1525                 spin_lock_irqsave(&ucs->lock, flags);
1526                 switch (ucs->pending) {
1527                 case HD_DEVICE_INIT_ACK:        /* no reply expected */
1528                         del_timer(&ucs->timer_ctrl);
1529                         ucs->pending = 0;
1530                         break;
1531                 }
1532                 spin_unlock_irqrestore(&ucs->lock, flags);
1533                 return;
1534
1535         case -ENOENT:                   /* cancelled */
1536         case -ECONNRESET:               /* cancelled (async) */
1537         case -EINPROGRESS:              /* pending */
1538         case -ENODEV:                   /* device removed */
1539         case -ESHUTDOWN:                /* device shut down */
1540                 /* ignore silently */
1541                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1542                         __func__, get_usb_statmsg(status));
1543                 break;
1544
1545         default:                                /* any failure */
1546                 /* don't retry if suspend requested */
1547                 if (++ucs->retry_ctrl > BAS_RETRY ||
1548                     (ucs->basstate & BS_SUSPEND)) {
1549                         dev_err(&ucs->interface->dev,
1550                                 "control request 0x%02x failed: %s\n",
1551                                 ucs->dr_ctrl.bRequest,
1552                                 get_usb_statmsg(status));
1553                         break;          /* give up */
1554                 }
1555                 dev_notice(&ucs->interface->dev,
1556                            "control request 0x%02x: %s, retry %d\n",
1557                            ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
1558                            ucs->retry_ctrl);
1559                 /* urb->dev is clobbered by USB subsystem */
1560                 urb->dev = ucs->udev;
1561                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1562                 if (unlikely(rc)) {
1563                         dev_err(&ucs->interface->dev,
1564                                 "could not resubmit request 0x%02x: %s\n",
1565                                 ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
1566                         break;
1567                 }
1568                 /* resubmitted */
1569                 return;
1570         }
1571
1572         /* failed, clear pending request */
1573         spin_lock_irqsave(&ucs->lock, flags);
1574         del_timer(&ucs->timer_ctrl);
1575         ucs->pending = 0;
1576         spin_unlock_irqrestore(&ucs->lock, flags);
1577         wake_up(&ucs->waitqueue);
1578 }
1579
1580 /* req_submit
1581  * submit a control output request without message buffer to the Gigaset base
1582  * and optionally start a timeout
1583  * parameters:
1584  *      bcs     B channel control structure
1585  *      req     control request code (HD_*)
1586  *      val     control request parameter value (set to 0 if unused)
1587  *      timeout timeout in seconds (0: no timeout)
1588  * return value:
1589  *      0 on success
1590  *      -EBUSY if another request is pending
1591  *      any URB submission error code
1592  */
1593 static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1594 {
1595         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1596         int ret;
1597         unsigned long flags;
1598
1599         gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1600
1601         spin_lock_irqsave(&ucs->lock, flags);
1602         if (ucs->pending) {
1603                 spin_unlock_irqrestore(&ucs->lock, flags);
1604                 dev_err(bcs->cs->dev,
1605                         "submission of request 0x%02x failed: "
1606                         "request 0x%02x still pending\n",
1607                         req, ucs->pending);
1608                 return -EBUSY;
1609         }
1610
1611         ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1612         ucs->dr_ctrl.bRequest = req;
1613         ucs->dr_ctrl.wValue = cpu_to_le16(val);
1614         ucs->dr_ctrl.wIndex = 0;
1615         ucs->dr_ctrl.wLength = 0;
1616         usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1617                              usb_sndctrlpipe(ucs->udev, 0),
1618                              (unsigned char *) &ucs->dr_ctrl, NULL, 0,
1619                              write_ctrl_callback, ucs);
1620         ucs->retry_ctrl = 0;
1621         ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
1622         if (unlikely(ret)) {
1623                 dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1624                         req, get_usb_rcmsg(ret));
1625                 spin_unlock_irqrestore(&ucs->lock, flags);
1626                 return ret;
1627         }
1628         ucs->pending = req;
1629
1630         if (timeout > 0) {
1631                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1632                 mod_timer(&ucs->timer_ctrl, jiffies + timeout * HZ / 10);
1633         }
1634
1635         spin_unlock_irqrestore(&ucs->lock, flags);
1636         return 0;
1637 }
1638
1639 /* gigaset_init_bchannel
1640  * called by common.c to connect a B channel
1641  * initialize isochronous I/O and tell the Gigaset base to open the channel
1642  * argument:
1643  *      B channel control structure
1644  * return value:
1645  *      0 on success, error code < 0 on error
1646  */
1647 static int gigaset_init_bchannel(struct bc_state *bcs)
1648 {
1649         struct cardstate *cs = bcs->cs;
1650         int req, ret;
1651         unsigned long flags;
1652
1653         spin_lock_irqsave(&cs->lock, flags);
1654         if (unlikely(!cs->connected)) {
1655                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1656                 spin_unlock_irqrestore(&cs->lock, flags);
1657                 return -ENODEV;
1658         }
1659
1660         if (cs->hw.bas->basstate & BS_SUSPEND) {
1661                 dev_notice(cs->dev,
1662                            "not starting isoc I/O, suspend in progress\n");
1663                 spin_unlock_irqrestore(&cs->lock, flags);
1664                 return -EHOSTUNREACH;
1665         }
1666
1667         ret = starturbs(bcs);
1668         if (ret < 0) {
1669                 spin_unlock_irqrestore(&cs->lock, flags);
1670                 dev_err(cs->dev,
1671                         "could not start isoc I/O for channel B%d: %s\n",
1672                         bcs->channel + 1,
1673                         ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
1674                 if (ret != -ENODEV)
1675                         error_hangup(bcs);
1676                 return ret;
1677         }
1678
1679         req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1680         ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1681         if (ret < 0) {
1682                 dev_err(cs->dev, "could not open channel B%d\n",
1683                         bcs->channel + 1);
1684                 stopurbs(bcs->hw.bas);
1685         }
1686
1687         spin_unlock_irqrestore(&cs->lock, flags);
1688         if (ret < 0 && ret != -ENODEV)
1689                 error_hangup(bcs);
1690         return ret;
1691 }
1692
1693 /* gigaset_close_bchannel
1694  * called by common.c to disconnect a B channel
1695  * tell the Gigaset base to close the channel
1696  * stopping isochronous I/O and LL notification will be done when the
1697  * acknowledgement for the close arrives
1698  * argument:
1699  *      B channel control structure
1700  * return value:
1701  *      0 on success, error code < 0 on error
1702  */
1703 static int gigaset_close_bchannel(struct bc_state *bcs)
1704 {
1705         struct cardstate *cs = bcs->cs;
1706         int req, ret;
1707         unsigned long flags;
1708
1709         spin_lock_irqsave(&cs->lock, flags);
1710         if (unlikely(!cs->connected)) {
1711                 spin_unlock_irqrestore(&cs->lock, flags);
1712                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1713                 return -ENODEV;
1714         }
1715
1716         if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1717                 /* channel not running: just signal common.c */
1718                 spin_unlock_irqrestore(&cs->lock, flags);
1719                 gigaset_bchannel_down(bcs);
1720                 return 0;
1721         }
1722
1723         /* channel running: tell device to close it */
1724         req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1725         ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1726         if (ret < 0)
1727                 dev_err(cs->dev, "closing channel B%d failed\n",
1728                         bcs->channel + 1);
1729
1730         spin_unlock_irqrestore(&cs->lock, flags);
1731         return ret;
1732 }
1733
1734 /* Device Operations */
1735 /* ================= */
1736
1737 /* complete_cb
1738  * unqueue first command buffer from queue, waking any sleepers
1739  * must be called with cs->cmdlock held
1740  * parameter:
1741  *      cs      controller state structure
1742  */
1743 static void complete_cb(struct cardstate *cs)
1744 {
1745         struct cmdbuf_t *cb = cs->cmdbuf;
1746
1747         /* unqueue completed buffer */
1748         cs->cmdbytes -= cs->curlen;
1749         gig_dbg(DEBUG_OUTPUT, "write_command: sent %u bytes, %u left",
1750                 cs->curlen, cs->cmdbytes);
1751         if (cb->next != NULL) {
1752                 cs->cmdbuf = cb->next;
1753                 cs->cmdbuf->prev = NULL;
1754                 cs->curlen = cs->cmdbuf->len;
1755         } else {
1756                 cs->cmdbuf = NULL;
1757                 cs->lastcmdbuf = NULL;
1758                 cs->curlen = 0;
1759         }
1760
1761         if (cb->wake_tasklet)
1762                 tasklet_schedule(cb->wake_tasklet);
1763
1764         kfree(cb);
1765 }
1766
1767 /* write_command_callback
1768  * USB completion handler for AT command transmission
1769  * called by the USB subsystem in interrupt context
1770  * parameter:
1771  *      urb     USB request block of completed request
1772  *              urb->context = controller state structure
1773  */
1774 static void write_command_callback(struct urb *urb)
1775 {
1776         struct cardstate *cs = urb->context;
1777         struct bas_cardstate *ucs = cs->hw.bas;
1778         int status = urb->status;
1779         unsigned long flags;
1780
1781         update_basstate(ucs, 0, BS_ATWRPEND);
1782         wake_up(&ucs->waitqueue);
1783
1784         /* check status */
1785         switch (status) {
1786         case 0:                                 /* normal completion */
1787                 break;
1788         case -ENOENT:                   /* cancelled */
1789         case -ECONNRESET:               /* cancelled (async) */
1790         case -EINPROGRESS:              /* pending */
1791         case -ENODEV:                   /* device removed */
1792         case -ESHUTDOWN:                /* device shut down */
1793                 /* ignore silently */
1794                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1795                         __func__, get_usb_statmsg(status));
1796                 return;
1797         default:                                /* any failure */
1798                 if (++ucs->retry_cmd_out > BAS_RETRY) {
1799                         dev_warn(cs->dev,
1800                                  "command write: %s, "
1801                                  "giving up after %d retries\n",
1802                                  get_usb_statmsg(status),
1803                                  ucs->retry_cmd_out);
1804                         break;
1805                 }
1806                 if (ucs->basstate & BS_SUSPEND) {
1807                         dev_warn(cs->dev,
1808                                  "command write: %s, "
1809                                  "won't retry - suspend requested\n",
1810                                  get_usb_statmsg(status));
1811                         break;
1812                 }
1813                 if (cs->cmdbuf == NULL) {
1814                         dev_warn(cs->dev,
1815                                  "command write: %s, "
1816                                  "cannot retry - cmdbuf gone\n",
1817                                  get_usb_statmsg(status));
1818                         break;
1819                 }
1820                 dev_notice(cs->dev, "command write: %s, retry %d\n",
1821                            get_usb_statmsg(status), ucs->retry_cmd_out);
1822                 if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1823                         /* resubmitted - bypass regular exit block */
1824                         return;
1825                 /* command send failed, assume base still waiting */
1826                 update_basstate(ucs, BS_ATREADY, 0);
1827         }
1828
1829         spin_lock_irqsave(&cs->cmdlock, flags);
1830         if (cs->cmdbuf != NULL)
1831                 complete_cb(cs);
1832         spin_unlock_irqrestore(&cs->cmdlock, flags);
1833 }
1834
1835 /* atrdy_timeout
1836  * timeout routine for AT command transmission
1837  * argument:
1838  *      controller state structure
1839  */
1840 static void atrdy_timeout(unsigned long data)
1841 {
1842         struct cardstate *cs = (struct cardstate *) data;
1843         struct bas_cardstate *ucs = cs->hw.bas;
1844
1845         dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1846
1847         /* fake the missing signal - what else can I do? */
1848         update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1849         start_cbsend(cs);
1850 }
1851
1852 /* atwrite_submit
1853  * submit an HD_WRITE_ATMESSAGE command URB
1854  * parameters:
1855  *      cs      controller state structure
1856  *      buf     buffer containing command to send
1857  *      len     length of command to send
1858  * return value:
1859  *      0 on success
1860  *      -EBUSY if another request is pending
1861  *      any URB submission error code
1862  */
1863 static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1864 {
1865         struct bas_cardstate *ucs = cs->hw.bas;
1866         int rc;
1867
1868         gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1869
1870         if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1871                 dev_err(cs->dev,
1872                         "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1873                 return -EBUSY;
1874         }
1875
1876         ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1877         ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1878         ucs->dr_cmd_out.wValue = 0;
1879         ucs->dr_cmd_out.wIndex = 0;
1880         ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1881         usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1882                              usb_sndctrlpipe(ucs->udev, 0),
1883                              (unsigned char *) &ucs->dr_cmd_out, buf, len,
1884                              write_command_callback, cs);
1885         rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
1886         if (unlikely(rc)) {
1887                 update_basstate(ucs, 0, BS_ATWRPEND);
1888                 dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1889                         get_usb_rcmsg(rc));
1890                 return rc;
1891         }
1892
1893         /* submitted successfully, start timeout if necessary */
1894         if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1895                 gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
1896                         ATRDY_TIMEOUT);
1897                 mod_timer(&ucs->timer_atrdy, jiffies + ATRDY_TIMEOUT * HZ / 10);
1898         }
1899         return 0;
1900 }
1901
1902 /* start_cbsend
1903  * start transmission of AT command queue if necessary
1904  * parameter:
1905  *      cs              controller state structure
1906  * return value:
1907  *      0 on success
1908  *      error code < 0 on error
1909  */
1910 static int start_cbsend(struct cardstate *cs)
1911 {
1912         struct cmdbuf_t *cb;
1913         struct bas_cardstate *ucs = cs->hw.bas;
1914         unsigned long flags;
1915         int rc;
1916         int retval = 0;
1917
1918         /* check if suspend requested */
1919         if (ucs->basstate & BS_SUSPEND) {
1920                 gig_dbg(DEBUG_OUTPUT, "suspending");
1921                 return -EHOSTUNREACH;
1922         }
1923
1924         /* check if AT channel is open */
1925         if (!(ucs->basstate & BS_ATOPEN)) {
1926                 gig_dbg(DEBUG_OUTPUT, "AT channel not open");
1927                 rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1928                 if (rc < 0) {
1929                         /* flush command queue */
1930                         spin_lock_irqsave(&cs->cmdlock, flags);
1931                         while (cs->cmdbuf != NULL)
1932                                 complete_cb(cs);
1933                         spin_unlock_irqrestore(&cs->cmdlock, flags);
1934                 }
1935                 return rc;
1936         }
1937
1938         /* try to send first command in queue */
1939         spin_lock_irqsave(&cs->cmdlock, flags);
1940
1941         while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
1942                 ucs->retry_cmd_out = 0;
1943                 rc = atwrite_submit(cs, cb->buf, cb->len);
1944                 if (unlikely(rc)) {
1945                         retval = rc;
1946                         complete_cb(cs);
1947                 }
1948         }
1949
1950         spin_unlock_irqrestore(&cs->cmdlock, flags);
1951         return retval;
1952 }
1953
1954 /* gigaset_write_cmd
1955  * This function is called by the device independent part of the driver
1956  * to transmit an AT command string to the Gigaset device.
1957  * It encapsulates the device specific method for transmission over the
1958  * direct USB connection to the base.
1959  * The command string is added to the queue of commands to send, and
1960  * USB transmission is started if necessary.
1961  * parameters:
1962  *      cs              controller state structure
1963  *      cb              command buffer structure
1964  * return value:
1965  *      number of bytes queued on success
1966  *      error code < 0 on error
1967  */
1968 static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb)
1969 {
1970         unsigned long flags;
1971         int rc;
1972
1973         gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
1974                              DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1975                            "CMD Transmit", cb->len, cb->buf);
1976
1977         /* translate "+++" escape sequence sent as a single separate command
1978          * into "close AT channel" command for error recovery
1979          * The next command will reopen the AT channel automatically.
1980          */
1981         if (cb->len == 3 && !memcmp(cb->buf, "+++", 3)) {
1982                 /* If an HD_RECEIVEATDATA_ACK message remains unhandled
1983                  * because of an error, the base never sends another one.
1984                  * The response channel is thus effectively blocked.
1985                  * Closing and reopening the AT channel does *not* clear
1986                  * this condition.
1987                  * As a stopgap measure, submit a zero-length AT read
1988                  * before closing the AT channel. This has the undocumented
1989                  * effect of triggering a new HD_RECEIVEATDATA_ACK message
1990                  * from the base if necessary.
1991                  * The subsequent AT channel close then discards any pending
1992                  * messages.
1993                  */
1994                 spin_lock_irqsave(&cs->lock, flags);
1995                 if (!(cs->hw.bas->basstate & BS_ATRDPEND)) {
1996                         kfree(cs->hw.bas->rcvbuf);
1997                         cs->hw.bas->rcvbuf = NULL;
1998                         cs->hw.bas->rcvbuf_size = 0;
1999                         cs->hw.bas->retry_cmd_in = 0;
2000                         atread_submit(cs, 0);
2001                 }
2002                 spin_unlock_irqrestore(&cs->lock, flags);
2003
2004                 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
2005                 if (cb->wake_tasklet)
2006                         tasklet_schedule(cb->wake_tasklet);
2007                 if (!rc)
2008                         rc = cb->len;
2009                 kfree(cb);
2010                 return rc;
2011         }
2012
2013         spin_lock_irqsave(&cs->cmdlock, flags);
2014         cb->prev = cs->lastcmdbuf;
2015         if (cs->lastcmdbuf)
2016                 cs->lastcmdbuf->next = cb;
2017         else {
2018                 cs->cmdbuf = cb;
2019                 cs->curlen = cb->len;
2020         }
2021         cs->cmdbytes += cb->len;
2022         cs->lastcmdbuf = cb;
2023         spin_unlock_irqrestore(&cs->cmdlock, flags);
2024
2025         spin_lock_irqsave(&cs->lock, flags);
2026         if (unlikely(!cs->connected)) {
2027                 spin_unlock_irqrestore(&cs->lock, flags);
2028                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
2029                 /* flush command queue */
2030                 spin_lock_irqsave(&cs->cmdlock, flags);
2031                 while (cs->cmdbuf != NULL)
2032                         complete_cb(cs);
2033                 spin_unlock_irqrestore(&cs->cmdlock, flags);
2034                 return -ENODEV;
2035         }
2036         rc = start_cbsend(cs);
2037         spin_unlock_irqrestore(&cs->lock, flags);
2038         return rc < 0 ? rc : cb->len;
2039 }
2040
2041 /* gigaset_write_room
2042  * tty_driver.write_room interface routine
2043  * return number of characters the driver will accept to be written via
2044  * gigaset_write_cmd
2045  * parameter:
2046  *      controller state structure
2047  * return value:
2048  *      number of characters
2049  */
2050 static int gigaset_write_room(struct cardstate *cs)
2051 {
2052         return IF_WRITEBUF;
2053 }
2054
2055 /* gigaset_chars_in_buffer
2056  * tty_driver.chars_in_buffer interface routine
2057  * return number of characters waiting to be sent
2058  * parameter:
2059  *      controller state structure
2060  * return value:
2061  *      number of characters
2062  */
2063 static int gigaset_chars_in_buffer(struct cardstate *cs)
2064 {
2065         return cs->cmdbytes;
2066 }
2067
2068 /* gigaset_brkchars
2069  * implementation of ioctl(GIGASET_BRKCHARS)
2070  * parameter:
2071  *      controller state structure
2072  * return value:
2073  *      -EINVAL (unimplemented function)
2074  */
2075 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
2076 {
2077         return -EINVAL;
2078 }
2079
2080
2081 /* Device Initialization/Shutdown */
2082 /* ============================== */
2083
2084 /* Free hardware dependent part of the B channel structure
2085  * parameter:
2086  *      bcs     B channel structure
2087  * return value:
2088  *      !=0 on success
2089  */
2090 static int gigaset_freebcshw(struct bc_state *bcs)
2091 {
2092         struct bas_bc_state *ubc = bcs->hw.bas;
2093         int i;
2094
2095         if (!ubc)
2096                 return 0;
2097
2098         /* kill URBs and tasklets before freeing - better safe than sorry */
2099         ubc->running = 0;
2100         gig_dbg(DEBUG_INIT, "%s: killing isoc URBs", __func__);
2101         for (i = 0; i < BAS_OUTURBS; ++i) {
2102                 usb_kill_urb(ubc->isoouturbs[i].urb);
2103                 usb_free_urb(ubc->isoouturbs[i].urb);
2104         }
2105         for (i = 0; i < BAS_INURBS; ++i) {
2106                 usb_kill_urb(ubc->isoinurbs[i]);
2107                 usb_free_urb(ubc->isoinurbs[i]);
2108         }
2109         tasklet_kill(&ubc->sent_tasklet);
2110         tasklet_kill(&ubc->rcvd_tasklet);
2111         kfree(ubc->isooutbuf);
2112         kfree(ubc);
2113         bcs->hw.bas = NULL;
2114         return 1;
2115 }
2116
2117 /* Initialize hardware dependent part of the B channel structure
2118  * parameter:
2119  *      bcs     B channel structure
2120  * return value:
2121  *      !=0 on success
2122  */
2123 static int gigaset_initbcshw(struct bc_state *bcs)
2124 {
2125         int i;
2126         struct bas_bc_state *ubc;
2127
2128         bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
2129         if (!ubc) {
2130                 pr_err("out of memory\n");
2131                 return 0;
2132         }
2133
2134         ubc->running = 0;
2135         atomic_set(&ubc->corrbytes, 0);
2136         spin_lock_init(&ubc->isooutlock);
2137         for (i = 0; i < BAS_OUTURBS; ++i) {
2138                 ubc->isoouturbs[i].urb = NULL;
2139                 ubc->isoouturbs[i].bcs = bcs;
2140         }
2141         ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
2142         ubc->numsub = 0;
2143         ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL);
2144         if (!ubc->isooutbuf) {
2145                 pr_err("out of memory\n");
2146                 kfree(ubc);
2147                 bcs->hw.bas = NULL;
2148                 return 0;
2149         }
2150         tasklet_init(&ubc->sent_tasklet,
2151                      write_iso_tasklet, (unsigned long) bcs);
2152
2153         spin_lock_init(&ubc->isoinlock);
2154         for (i = 0; i < BAS_INURBS; ++i)
2155                 ubc->isoinurbs[i] = NULL;
2156         ubc->isoindone = NULL;
2157         ubc->loststatus = -EINPROGRESS;
2158         ubc->isoinlost = 0;
2159         ubc->seqlen = 0;
2160         ubc->inbyte = 0;
2161         ubc->inbits = 0;
2162         ubc->goodbytes = 0;
2163         ubc->alignerrs = 0;
2164         ubc->fcserrs = 0;
2165         ubc->frameerrs = 0;
2166         ubc->giants = 0;
2167         ubc->runts = 0;
2168         ubc->aborts = 0;
2169         ubc->shared0s = 0;
2170         ubc->stolen0s = 0;
2171         tasklet_init(&ubc->rcvd_tasklet,
2172                      read_iso_tasklet, (unsigned long) bcs);
2173         return 1;
2174 }
2175
2176 static void gigaset_reinitbcshw(struct bc_state *bcs)
2177 {
2178         struct bas_bc_state *ubc = bcs->hw.bas;
2179
2180         bcs->hw.bas->running = 0;
2181         atomic_set(&bcs->hw.bas->corrbytes, 0);
2182         bcs->hw.bas->numsub = 0;
2183         spin_lock_init(&ubc->isooutlock);
2184         spin_lock_init(&ubc->isoinlock);
2185         ubc->loststatus = -EINPROGRESS;
2186 }
2187
2188 static void gigaset_freecshw(struct cardstate *cs)
2189 {
2190         /* timers, URBs and rcvbuf are disposed of in disconnect */
2191         kfree(cs->hw.bas->int_in_buf);
2192         kfree(cs->hw.bas);
2193         cs->hw.bas = NULL;
2194 }
2195
2196 static int gigaset_initcshw(struct cardstate *cs)
2197 {
2198         struct bas_cardstate *ucs;
2199
2200         cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
2201         if (!ucs) {
2202                 pr_err("out of memory\n");
2203                 return 0;
2204         }
2205         ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
2206         if (!ucs->int_in_buf) {
2207                 kfree(ucs);
2208                 pr_err("out of memory\n");
2209                 return 0;
2210         }
2211
2212         ucs->urb_cmd_in = NULL;
2213         ucs->urb_cmd_out = NULL;
2214         ucs->rcvbuf = NULL;
2215         ucs->rcvbuf_size = 0;
2216
2217         spin_lock_init(&ucs->lock);
2218         ucs->pending = 0;
2219
2220         ucs->basstate = 0;
2221         setup_timer(&ucs->timer_ctrl, req_timeout, (unsigned long) cs);
2222         setup_timer(&ucs->timer_atrdy, atrdy_timeout, (unsigned long) cs);
2223         setup_timer(&ucs->timer_cmd_in, cmd_in_timeout, (unsigned long) cs);
2224         setup_timer(&ucs->timer_int_in, int_in_resubmit, (unsigned long) cs);
2225         init_waitqueue_head(&ucs->waitqueue);
2226         INIT_WORK(&ucs->int_in_wq, int_in_work);
2227
2228         return 1;
2229 }
2230
2231 /* freeurbs
2232  * unlink and deallocate all URBs unconditionally
2233  * caller must make sure that no commands are still in progress
2234  * parameter:
2235  *      cs      controller state structure
2236  */
2237 static void freeurbs(struct cardstate *cs)
2238 {
2239         struct bas_cardstate *ucs = cs->hw.bas;
2240         struct bas_bc_state *ubc;
2241         int i, j;
2242
2243         gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
2244         for (j = 0; j < BAS_CHANNELS; ++j) {
2245                 ubc = cs->bcs[j].hw.bas;
2246                 for (i = 0; i < BAS_OUTURBS; ++i) {
2247                         usb_kill_urb(ubc->isoouturbs[i].urb);
2248                         usb_free_urb(ubc->isoouturbs[i].urb);
2249                         ubc->isoouturbs[i].urb = NULL;
2250                 }
2251                 for (i = 0; i < BAS_INURBS; ++i) {
2252                         usb_kill_urb(ubc->isoinurbs[i]);
2253                         usb_free_urb(ubc->isoinurbs[i]);
2254                         ubc->isoinurbs[i] = NULL;
2255                 }
2256         }
2257         usb_kill_urb(ucs->urb_int_in);
2258         usb_free_urb(ucs->urb_int_in);
2259         ucs->urb_int_in = NULL;
2260         usb_kill_urb(ucs->urb_cmd_out);
2261         usb_free_urb(ucs->urb_cmd_out);
2262         ucs->urb_cmd_out = NULL;
2263         usb_kill_urb(ucs->urb_cmd_in);
2264         usb_free_urb(ucs->urb_cmd_in);
2265         ucs->urb_cmd_in = NULL;
2266         usb_kill_urb(ucs->urb_ctrl);
2267         usb_free_urb(ucs->urb_ctrl);
2268         ucs->urb_ctrl = NULL;
2269 }
2270
2271 /* gigaset_probe
2272  * This function is called when a new USB device is connected.
2273  * It checks whether the new device is handled by this driver.
2274  */
2275 static int gigaset_probe(struct usb_interface *interface,
2276                          const struct usb_device_id *id)
2277 {
2278         struct usb_host_interface *hostif;
2279         struct usb_device *udev = interface_to_usbdev(interface);
2280         struct cardstate *cs = NULL;
2281         struct bas_cardstate *ucs = NULL;
2282         struct bas_bc_state *ubc;
2283         struct usb_endpoint_descriptor *endpoint;
2284         int i, j;
2285         int rc;
2286
2287         gig_dbg(DEBUG_INIT,
2288                 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2289                 __func__, le16_to_cpu(udev->descriptor.idVendor),
2290                 le16_to_cpu(udev->descriptor.idProduct));
2291
2292         /* set required alternate setting */
2293         hostif = interface->cur_altsetting;
2294         if (hostif->desc.bAlternateSetting != 3) {
2295                 gig_dbg(DEBUG_INIT,
2296                         "%s: wrong alternate setting %d - trying to switch",
2297                         __func__, hostif->desc.bAlternateSetting);
2298                 if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3)
2299                     < 0) {
2300                         dev_warn(&udev->dev, "usb_set_interface failed, "
2301                                  "device %d interface %d altsetting %d\n",
2302                                  udev->devnum, hostif->desc.bInterfaceNumber,
2303                                  hostif->desc.bAlternateSetting);
2304                         return -ENODEV;
2305                 }
2306                 hostif = interface->cur_altsetting;
2307         }
2308
2309         /* Reject application specific interfaces
2310          */
2311         if (hostif->desc.bInterfaceClass != 255) {
2312                 dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
2313                          __func__, hostif->desc.bInterfaceClass);
2314                 return -ENODEV;
2315         }
2316
2317         if (hostif->desc.bNumEndpoints < 1)
2318                 return -ENODEV;
2319
2320         dev_info(&udev->dev,
2321                  "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
2322                  __func__, le16_to_cpu(udev->descriptor.idVendor),
2323                  le16_to_cpu(udev->descriptor.idProduct));
2324
2325         /* allocate memory for our device state and initialize it */
2326         cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
2327                             GIGASET_MODULENAME);
2328         if (!cs)
2329                 return -ENODEV;
2330         ucs = cs->hw.bas;
2331
2332         /* save off device structure ptrs for later use */
2333         usb_get_dev(udev);
2334         ucs->udev = udev;
2335         ucs->interface = interface;
2336         cs->dev = &interface->dev;
2337
2338         /* allocate URBs:
2339          * - one for the interrupt pipe
2340          * - three for the different uses of the default control pipe
2341          * - three for each isochronous pipe
2342          */
2343         if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2344             !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2345             !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
2346             !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
2347                 goto allocerr;
2348
2349         for (j = 0; j < BAS_CHANNELS; ++j) {
2350                 ubc = cs->bcs[j].hw.bas;
2351                 for (i = 0; i < BAS_OUTURBS; ++i)
2352                         if (!(ubc->isoouturbs[i].urb =
2353                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2354                                 goto allocerr;
2355                 for (i = 0; i < BAS_INURBS; ++i)
2356                         if (!(ubc->isoinurbs[i] =
2357                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2358                                 goto allocerr;
2359         }
2360
2361         ucs->rcvbuf = NULL;
2362         ucs->rcvbuf_size = 0;
2363
2364         /* Fill the interrupt urb and send it to the core */
2365         endpoint = &hostif->endpoint[0].desc;
2366         usb_fill_int_urb(ucs->urb_int_in, udev,
2367                          usb_rcvintpipe(udev,
2368                                         (endpoint->bEndpointAddress) & 0x0f),
2369                          ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
2370                          endpoint->bInterval);
2371         rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2372         if (rc != 0) {
2373                 dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2374                         get_usb_rcmsg(rc));
2375                 goto error;
2376         }
2377         ucs->retry_int_in = 0;
2378
2379         /* tell the device that the driver is ready */
2380         rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0);
2381         if (rc != 0)
2382                 goto error;
2383
2384         /* tell common part that the device is ready */
2385         if (startmode == SM_LOCKED)
2386                 cs->mstate = MS_LOCKED;
2387
2388         /* save address of controller structure */
2389         usb_set_intfdata(interface, cs);
2390
2391         if (!gigaset_start(cs))
2392                 goto error;
2393
2394         return 0;
2395
2396 allocerr:
2397         dev_err(cs->dev, "could not allocate URBs\n");
2398 error:
2399         freeurbs(cs);
2400         usb_set_intfdata(interface, NULL);
2401         gigaset_freecs(cs);
2402         return -ENODEV;
2403 }
2404
2405 /* gigaset_disconnect
2406  * This function is called when the Gigaset base is unplugged.
2407  */
2408 static void gigaset_disconnect(struct usb_interface *interface)
2409 {
2410         struct cardstate *cs;
2411         struct bas_cardstate *ucs;
2412         int j;
2413
2414         cs = usb_get_intfdata(interface);
2415
2416         ucs = cs->hw.bas;
2417
2418         dev_info(cs->dev, "disconnecting Gigaset base\n");
2419
2420         /* mark base as not ready, all channels disconnected */
2421         ucs->basstate = 0;
2422
2423         /* tell LL all channels are down */
2424         for (j = 0; j < BAS_CHANNELS; ++j)
2425                 gigaset_bchannel_down(cs->bcs + j);
2426
2427         /* stop driver (common part) */
2428         gigaset_stop(cs);
2429
2430         /* stop delayed work and URBs, free ressources */
2431         del_timer_sync(&ucs->timer_ctrl);
2432         del_timer_sync(&ucs->timer_atrdy);
2433         del_timer_sync(&ucs->timer_cmd_in);
2434         del_timer_sync(&ucs->timer_int_in);
2435         cancel_work_sync(&ucs->int_in_wq);
2436         freeurbs(cs);
2437         usb_set_intfdata(interface, NULL);
2438         kfree(ucs->rcvbuf);
2439         ucs->rcvbuf = NULL;
2440         ucs->rcvbuf_size = 0;
2441         usb_put_dev(ucs->udev);
2442         ucs->interface = NULL;
2443         ucs->udev = NULL;
2444         cs->dev = NULL;
2445         gigaset_freecs(cs);
2446 }
2447
2448 /* gigaset_suspend
2449  * This function is called before the USB connection is suspended
2450  * or before the USB device is reset.
2451  * In the latter case, message == PMSG_ON.
2452  */
2453 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
2454 {
2455         struct cardstate *cs = usb_get_intfdata(intf);
2456         struct bas_cardstate *ucs = cs->hw.bas;
2457         int rc;
2458
2459         /* set suspend flag; this stops AT command/response traffic */
2460         if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
2461                 gig_dbg(DEBUG_SUSPEND, "already suspended");
2462                 return 0;
2463         }
2464
2465         /* wait a bit for blocking conditions to go away */
2466         rc = wait_event_timeout(ucs->waitqueue,
2467                         !(ucs->basstate &
2468                           (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)),
2469                         BAS_TIMEOUT*HZ/10);
2470         gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
2471
2472         /* check for conditions preventing suspend */
2473         if (ucs->basstate & (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)) {
2474                 dev_warn(cs->dev, "cannot suspend:\n");
2475                 if (ucs->basstate & BS_B1OPEN)
2476                         dev_warn(cs->dev, " B channel 1 open\n");
2477                 if (ucs->basstate & BS_B2OPEN)
2478                         dev_warn(cs->dev, " B channel 2 open\n");
2479                 if (ucs->basstate & BS_ATRDPEND)
2480                         dev_warn(cs->dev, " receiving AT reply\n");
2481                 if (ucs->basstate & BS_ATWRPEND)
2482                         dev_warn(cs->dev, " sending AT command\n");
2483                 update_basstate(ucs, 0, BS_SUSPEND);
2484                 return -EBUSY;
2485         }
2486
2487         /* close AT channel if open */
2488         if (ucs->basstate & BS_ATOPEN) {
2489                 gig_dbg(DEBUG_SUSPEND, "closing AT channel");
2490                 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
2491                 if (rc) {
2492                         update_basstate(ucs, 0, BS_SUSPEND);
2493                         return rc;
2494                 }
2495                 wait_event_timeout(ucs->waitqueue, !ucs->pending,
2496                                    BAS_TIMEOUT*HZ/10);
2497                 /* in case of timeout, proceed anyway */
2498         }
2499
2500         /* kill all URBs and delayed work that might still be pending */
2501         usb_kill_urb(ucs->urb_ctrl);
2502         usb_kill_urb(ucs->urb_int_in);
2503         del_timer_sync(&ucs->timer_ctrl);
2504         del_timer_sync(&ucs->timer_atrdy);
2505         del_timer_sync(&ucs->timer_cmd_in);
2506         del_timer_sync(&ucs->timer_int_in);
2507
2508         /* don't try to cancel int_in_wq from within reset as it
2509          * might be the one requesting the reset
2510          */
2511         if (message.event != PM_EVENT_ON)
2512                 cancel_work_sync(&ucs->int_in_wq);
2513
2514         gig_dbg(DEBUG_SUSPEND, "suspend complete");
2515         return 0;
2516 }
2517
2518 /* gigaset_resume
2519  * This function is called after the USB connection has been resumed.
2520  */
2521 static int gigaset_resume(struct usb_interface *intf)
2522 {
2523         struct cardstate *cs = usb_get_intfdata(intf);
2524         struct bas_cardstate *ucs = cs->hw.bas;
2525         int rc;
2526
2527         /* resubmit interrupt URB for spontaneous messages from base */
2528         rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2529         if (rc) {
2530                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
2531                         get_usb_rcmsg(rc));
2532                 return rc;
2533         }
2534         ucs->retry_int_in = 0;
2535
2536         /* clear suspend flag to reallow activity */
2537         update_basstate(ucs, 0, BS_SUSPEND);
2538
2539         gig_dbg(DEBUG_SUSPEND, "resume complete");
2540         return 0;
2541 }
2542
2543 /* gigaset_pre_reset
2544  * This function is called before the USB connection is reset.
2545  */
2546 static int gigaset_pre_reset(struct usb_interface *intf)
2547 {
2548         /* handle just like suspend */
2549         return gigaset_suspend(intf, PMSG_ON);
2550 }
2551
2552 /* gigaset_post_reset
2553  * This function is called after the USB connection has been reset.
2554  */
2555 static int gigaset_post_reset(struct usb_interface *intf)
2556 {
2557         /* FIXME: send HD_DEVICE_INIT_ACK? */
2558
2559         /* resume operations */
2560         return gigaset_resume(intf);
2561 }
2562
2563
2564 static const struct gigaset_ops gigops = {
2565         gigaset_write_cmd,
2566         gigaset_write_room,
2567         gigaset_chars_in_buffer,
2568         gigaset_brkchars,
2569         gigaset_init_bchannel,
2570         gigaset_close_bchannel,
2571         gigaset_initbcshw,
2572         gigaset_freebcshw,
2573         gigaset_reinitbcshw,
2574         gigaset_initcshw,
2575         gigaset_freecshw,
2576         gigaset_set_modem_ctrl,
2577         gigaset_baud_rate,
2578         gigaset_set_line_ctrl,
2579         gigaset_isoc_send_skb,
2580         gigaset_isoc_input,
2581 };
2582
2583 /* bas_gigaset_init
2584  * This function is called after the kernel module is loaded.
2585  */
2586 static int __init bas_gigaset_init(void)
2587 {
2588         int result;
2589
2590         /* allocate memory for our driver state and initialize it */
2591         driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2592                                     GIGASET_MODULENAME, GIGASET_DEVNAME,
2593                                     &gigops, THIS_MODULE);
2594         if (driver == NULL)
2595                 goto error;
2596
2597         /* register this driver with the USB subsystem */
2598         result = usb_register(&gigaset_usb_driver);
2599         if (result < 0) {
2600                 pr_err("error %d registering USB driver\n", -result);
2601                 goto error;
2602         }
2603
2604         pr_info(DRIVER_DESC "\n");
2605         return 0;
2606
2607 error:
2608         if (driver)
2609                 gigaset_freedriver(driver);
2610         driver = NULL;
2611         return -1;
2612 }
2613
2614 /* bas_gigaset_exit
2615  * This function is called before the kernel module is unloaded.
2616  */
2617 static void __exit bas_gigaset_exit(void)
2618 {
2619         struct bas_cardstate *ucs;
2620         int i;
2621
2622         gigaset_blockdriver(driver); /* => probe will fail
2623                                       * => no gigaset_start any more
2624                                       */
2625
2626         /* stop all connected devices */
2627         for (i = 0; i < driver->minors; i++) {
2628                 if (gigaset_shutdown(driver->cs + i) < 0)
2629                         continue;               /* no device */
2630                 /* from now on, no isdn callback should be possible */
2631
2632                 /* close all still open channels */
2633                 ucs = driver->cs[i].hw.bas;
2634                 if (ucs->basstate & BS_B1OPEN) {
2635                         gig_dbg(DEBUG_INIT, "closing B1 channel");
2636                         usb_control_msg(ucs->udev,
2637                                         usb_sndctrlpipe(ucs->udev, 0),
2638                                         HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
2639                                         0, 0, NULL, 0, BAS_TIMEOUT);
2640                 }
2641                 if (ucs->basstate & BS_B2OPEN) {
2642                         gig_dbg(DEBUG_INIT, "closing B2 channel");
2643                         usb_control_msg(ucs->udev,
2644                                         usb_sndctrlpipe(ucs->udev, 0),
2645                                         HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
2646                                         0, 0, NULL, 0, BAS_TIMEOUT);
2647                 }
2648                 if (ucs->basstate & BS_ATOPEN) {
2649                         gig_dbg(DEBUG_INIT, "closing AT channel");
2650                         usb_control_msg(ucs->udev,
2651                                         usb_sndctrlpipe(ucs->udev, 0),
2652                                         HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
2653                                         0, 0, NULL, 0, BAS_TIMEOUT);
2654                 }
2655                 ucs->basstate = 0;
2656         }
2657
2658         /* deregister this driver with the USB subsystem */
2659         usb_deregister(&gigaset_usb_driver);
2660         /* this will call the disconnect-callback */
2661         /* from now on, no disconnect/probe callback should be running */
2662
2663         gigaset_freedriver(driver);
2664         driver = NULL;
2665 }
2666
2667
2668 module_init(bas_gigaset_init);
2669 module_exit(bas_gigaset_exit);
2670
2671 MODULE_AUTHOR(DRIVER_AUTHOR);
2672 MODULE_DESCRIPTION(DRIVER_DESC);
2673 MODULE_LICENSE("GPL");