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