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   1 /*
   2  * USB driver for Gigaset 307x base via direct USB connection.
   3  *
   4  * Copyright (c) 2001 by Hansjoerg Lipp <hjlipp@web.de>,
   5  *                       Tilman Schmidt <tilman@imap.cc>,
   6  *                       Stefan Eilers.
   7  *
   8  * =====================================================================
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License as
  11  *      published by the Free Software Foundation; either version 2 of
  12  *      the License, or (at your option) any later version.
  13  * =====================================================================
  14  */
  15
  16 #include "gigaset.h"
  17
  18 #include <linux/errno.h>
  19 #include <linux/init.h>
  20 #include <linux/slab.h>
  21 #include <linux/timer.h>
  22 #include <linux/usb.h>
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25
  26 /* Version Information */
  27 #define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
  28 #define DRIVER_DESC "USB Driver for Gigaset 307x"
  29
  30
  31 /* Module parameters */
  32
  33 static int startmode = SM_ISDN;
  34 static int cidmode = 1;
  35
  36 module_param(startmode, int, S_IRUGO);
  37 module_param(cidmode, int, S_IRUGO);
  38 MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
  39 MODULE_PARM_DESC(cidmode, "Call-ID mode");
  40
  41 #define GIGASET_MINORS     1
  42 #define GIGASET_MINOR      16
  43 #define GIGASET_MODULENAME "bas_gigaset"
  44 #define GIGASET_DEVNAME    "ttyGB"
  45
  46 /* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
  47 #define IF_WRITEBUF 264
  48
  49 /* interrupt pipe message size according to ibid. ch. 2.2 */
  50 #define IP_MSGSIZE 3
  51
  52 /* Values for the Gigaset 307x */
  53 #define USB_GIGA_VENDOR_ID      0x0681
  54 #define USB_3070_PRODUCT_ID     0x0001
  55 #define USB_3075_PRODUCT_ID     0x0002
  56 #define USB_SX303_PRODUCT_ID    0x0021
  57 #define USB_SX353_PRODUCT_ID    0x0022
  58
  59 /* table of devices that work with this driver */
  60 static const struct usb_device_id gigaset_table[] = {
  61         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3070_PRODUCT_ID) },
  62         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3075_PRODUCT_ID) },
  63         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX303_PRODUCT_ID) },
  64         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX353_PRODUCT_ID) },
  65         { } /* Terminating entry */
  66 };
  67
  68 MODULE_DEVICE_TABLE(usb, gigaset_table);
  69
  70 /*======================= local function prototypes ==========================*/
  71
  72 /* function called if a new device belonging to this driver is connected */
  73 static int gigaset_probe(struct usb_interface *interface,
  74                          const struct usb_device_id *id);
  75
  76 /* Function will be called if the device is unplugged */
  77 static void gigaset_disconnect(struct usb_interface *interface);
  78
  79 /* functions called before/after suspend */
  80 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
  81 static int gigaset_resume(struct usb_interface *intf);
  82
  83 /* functions called before/after device reset */
  84 static int gigaset_pre_reset(struct usb_interface *intf);
  85 static int gigaset_post_reset(struct usb_interface *intf);
  86
  87 static int atread_submit(struct cardstate *, int);
  88 static void stopurbs(struct bas_bc_state *);
  89 static int req_submit(struct bc_state *, int, int, int);
  90 static int atwrite_submit(struct cardstate *, unsigned char *, int);
  91 static int start_cbsend(struct cardstate *);
  92
  93 /*============================================================================*/
  94
  95 struct bas_cardstate {
  96         struct usb_device       *udev;          /* USB device pointer */
  97         struct usb_interface    *interface;     /* interface for this device */
  98         unsigned char           minor;          /* starting minor number */
  99
 100         struct urb              *urb_ctrl;      /* control pipe default URB */
 101         struct usb_ctrlrequest  dr_ctrl;
 102         struct timer_list       timer_ctrl;     /* control request timeout */
 103         int                     retry_ctrl;
 104
 105         struct timer_list       timer_atrdy;    /* AT command ready timeout */
 106         struct urb              *urb_cmd_out;   /* for sending AT commands */
 107         struct usb_ctrlrequest  dr_cmd_out;
 108         int                     retry_cmd_out;
 109
 110         struct urb              *urb_cmd_in;    /* for receiving AT replies */
 111         struct usb_ctrlrequest  dr_cmd_in;
 112         struct timer_list       timer_cmd_in;   /* receive request timeout */
 113         unsigned char           *rcvbuf;        /* AT reply receive buffer */
 114
 115         struct urb              *urb_int_in;    /* URB for interrupt pipe */
 116         unsigned char           *int_in_buf;
 117
 118         spinlock_t              lock;           /* locks all following */
 119         int                     basstate;       /* bitmap (BS_*) */
 120         int                     pending;        /* uncompleted base request */
 121         wait_queue_head_t       waitqueue;
 122         int                     rcvbuf_size;    /* size of AT receive buffer */
 123                                                 /* 0: no receive in progress */
 124         int                     retry_cmd_in;   /* receive req retry count */
 125 };
 126
 127 /* status of direct USB connection to 307x base (bits in basstate) */
 128 #define BS_ATOPEN       0x001   /* AT channel open */
 129 #define BS_B1OPEN       0x002   /* B channel 1 open */
 130 #define BS_B2OPEN       0x004   /* B channel 2 open */
 131 #define BS_ATREADY      0x008   /* base ready for AT command */
 132 #define BS_INIT         0x010   /* base has signalled INIT_OK */
 133 #define BS_ATTIMER      0x020   /* waiting for HD_READY_SEND_ATDATA */
 134 #define BS_ATRDPEND     0x040   /* urb_cmd_in in use */
 135 #define BS_ATWRPEND     0x080   /* urb_cmd_out in use */
 136 #define BS_SUSPEND      0x100   /* USB port suspended */
 137 #define BS_RESETTING    0x200   /* waiting for HD_RESET_INTERRUPT_PIPE_ACK */
 138
 139
 140 static struct gigaset_driver *driver;
 141
 142 /* usb specific object needed to register this driver with the usb subsystem */
 143 static struct usb_driver gigaset_usb_driver = {
 144         .name =         GIGASET_MODULENAME,
 145         .probe =        gigaset_probe,
 146         .disconnect =   gigaset_disconnect,
 147         .id_table =     gigaset_table,
 148         .suspend =      gigaset_suspend,
 149         .resume =       gigaset_resume,
 150         .reset_resume = gigaset_post_reset,
 151         .pre_reset =    gigaset_pre_reset,
 152         .post_reset =   gigaset_post_reset,
 153 };
 154
 155 /* get message text for usb_submit_urb return code
 156  */
 157 static char *get_usb_rcmsg(int rc)
 158 {
 159         static char unkmsg[28];
 160
 161         switch (rc) {
 162         case 0:
 163                 return "success";
 164         case -ENOMEM:
 165                 return "out of memory";
 166         case -ENODEV:
 167                 return "device not present";
 168         case -ENOENT:
 169                 return "endpoint not present";
 170         case -ENXIO:
 171                 return "URB type not supported";
 172         case -EINVAL:
 173                 return "invalid argument";
 174         case -EAGAIN:
 175                 return "start frame too early or too much scheduled";
 176         case -EFBIG:
 177                 return "too many isochronous frames requested";
 178         case -EPIPE:
 179                 return "endpoint stalled";
 180         case -EMSGSIZE:
 181                 return "invalid packet size";
 182         case -ENOSPC:
 183                 return "would overcommit USB bandwidth";
 184         case -ESHUTDOWN:
 185                 return "device shut down";
 186         case -EPERM:
 187                 return "reject flag set";
 188         case -EHOSTUNREACH:
 189                 return "device suspended";
 190         default:
 191                 snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
 192                 return unkmsg;
 193         }
 194 }
 195
 196 /* get message text for USB status code
 197  */
 198 static char *get_usb_statmsg(int status)
 199 {
 200         static char unkmsg[28];
 201
 202         switch (status) {
 203         case 0:
 204                 return "success";
 205         case -ENOENT:
 206                 return "unlinked (sync)";
 207         case -EINPROGRESS:
 208                 return "pending";
 209         case -EPROTO:
 210                 return "bit stuffing error, timeout, or unknown USB error";
 211         case -EILSEQ:
 212                 return "CRC mismatch, timeout, or unknown USB error";
 213         case -ETIME:
 214                 return "timed out";
 215         case -EPIPE:
 216                 return "endpoint stalled";
 217         case -ECOMM:
 218                 return "IN buffer overrun";
 219         case -ENOSR:
 220                 return "OUT buffer underrun";
 221         case -EOVERFLOW:
 222                 return "too much data";
 223         case -EREMOTEIO:
 224                 return "short packet detected";
 225         case -ENODEV:
 226                 return "device removed";
 227         case -EXDEV:
 228                 return "partial isochronous transfer";
 229         case -EINVAL:
 230                 return "invalid argument";
 231         case -ECONNRESET:
 232                 return "unlinked (async)";
 233         case -ESHUTDOWN:
 234                 return "device shut down";
 235         default:
 236                 snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
 237                 return unkmsg;
 238         }
 239 }
 240
 241 /* usb_pipetype_str
 242  * retrieve string representation of USB pipe type
 243  */
 244 static inline char *usb_pipetype_str(int pipe)
 245 {
 246         if (usb_pipeisoc(pipe))
 247                 return "Isoc";
 248         if (usb_pipeint(pipe))
 249                 return "Int";
 250         if (usb_pipecontrol(pipe))
 251                 return "Ctrl";
 252         if (usb_pipebulk(pipe))
 253                 return "Bulk";
 254         return "?";
 255 }
 256
 257 /* dump_urb
 258  * write content of URB to syslog for debugging
 259  */
 260 static inline void dump_urb(enum debuglevel level, const char *tag,
 261                             struct urb *urb)
 262 {
 263 #ifdef CONFIG_GIGASET_DEBUG
 264         int i;
 265         gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
 266         if (urb) {
 267                 gig_dbg(level,
 268                         "  dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
 269                         "hcpriv=0x%08lx, transfer_flags=0x%x,",
 270                         (unsigned long) urb->dev,
 271                         usb_pipetype_str(urb->pipe),
 272                         usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
 273                         usb_pipein(urb->pipe) ? "in" : "out",
 274                         (unsigned long) urb->hcpriv,
 275                         urb->transfer_flags);
 276                 gig_dbg(level,
 277                         "  transfer_buffer=0x%08lx[%d], actual_length=%d, "
 278                         "setup_packet=0x%08lx,",
 279                         (unsigned long) urb->transfer_buffer,
 280                         urb->transfer_buffer_length, urb->actual_length,
 281                         (unsigned long) urb->setup_packet);
 282                 gig_dbg(level,
 283                         "  start_frame=%d, number_of_packets=%d, interval=%d, "
 284                         "error_count=%d,",
 285                         urb->start_frame, urb->number_of_packets, urb->interval,
 286                         urb->error_count);
 287                 gig_dbg(level,
 288                         "  context=0x%08lx, complete=0x%08lx, "
 289                         "iso_frame_desc[]={",
 290                         (unsigned long) urb->context,
 291                         (unsigned long) urb->complete);
 292                 for (i = 0; i < urb->number_of_packets; i++) {
 293                         struct usb_iso_packet_descriptor *pifd
 294                                 = &urb->iso_frame_desc[i];
 295                         gig_dbg(level,
 296                                 "    {offset=%u, length=%u, actual_length=%u, "
 297                                 "status=%u}",
 298                                 pifd->offset, pifd->length, pifd->actual_length,
 299                                 pifd->status);
 300                 }
 301         }
 302         gig_dbg(level, "}}");
 303 #endif
 304 }
 305
 306 /* read/set modem control bits etc. (m10x only) */
 307 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
 308                                   unsigned new_state)
 309 {
 310         return -EINVAL;
 311 }
 312
 313 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
 314 {
 315         return -EINVAL;
 316 }
 317
 318 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
 319 {
 320         return -EINVAL;
 321 }
 322
 323 /* set/clear bits in base connection state, return previous state
 324  */
 325 static inline int update_basstate(struct bas_cardstate *ucs,
 326                                   int set, int clear)
 327 {
 328         unsigned long flags;
 329         int state;
 330
 331         spin_lock_irqsave(&ucs->lock, flags);
 332         state = ucs->basstate;
 333         ucs->basstate = (state & ~clear) | set;
 334         spin_unlock_irqrestore(&ucs->lock, flags);
 335         return state;
 336 }
 337
 338 /* error_hangup
 339  * hang up any existing connection because of an unrecoverable error
 340  * This function may be called from any context and takes care of scheduling
 341  * the necessary actions for execution outside of interrupt context.
 342  * cs->lock must not be held.
 343  * argument:
 344  *      B channel control structure
 345  */
 346 static inline void error_hangup(struct bc_state *bcs)
 347 {
 348         struct cardstate *cs = bcs->cs;
 349
 350         gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL);
 351         gigaset_schedule_event(cs);
 352 }
 353
 354 /* error_reset
 355  * reset Gigaset device because of an unrecoverable error
 356  * This function may be called from any context, and takes care of
 357  * scheduling the necessary actions for execution outside of interrupt context.
 358  * cs->lock must not be held.
 359  * argument:
 360  *      controller state structure
 361  */
 362 static inline void error_reset(struct cardstate *cs)
 363 {
 364         /* reset interrupt pipe to recover (ignore errors) */
 365         update_basstate(cs->hw.bas, BS_RESETTING, 0);
 366         req_submit(cs->bcs, HD_RESET_INTERRUPT_PIPE, 0, BAS_TIMEOUT);
 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_notice(cs->dev, "control read: timeout, retry %d\n",
 448                            ucs->retry_cmd_in);
 449                 rc = atread_submit(cs, BAS_TIMEOUT);
 450                 if (rc >= 0 || rc == -ENODEV)
 451                         /* resubmitted or disconnected */
 452                         /* - bypass regular exit block */
 453                         return;
 454         } else {
 455                 dev_err(cs->dev,
 456                         "control read: timeout, giving up after %d tries\n",
 457                         ucs->retry_cmd_in);
 458         }
 459         kfree(ucs->rcvbuf);
 460         ucs->rcvbuf = NULL;
 461         ucs->rcvbuf_size = 0;
 462         error_reset(cs);
 463 }
 464
 465 /* read_ctrl_callback
 466  * USB completion handler for control pipe input
 467  * called by the USB subsystem in interrupt context
 468  * parameter:
 469  *      urb     USB request block
 470  *              urb->context = inbuf structure for controller state
 471  */
 472 static void read_ctrl_callback(struct urb *urb)
 473 {
 474         struct inbuf_t *inbuf = urb->context;
 475         struct cardstate *cs = inbuf->cs;
 476         struct bas_cardstate *ucs = cs->hw.bas;
 477         int status = urb->status;
 478         int have_data = 0;
 479         unsigned numbytes;
 480         int rc;
 481
 482         update_basstate(ucs, 0, BS_ATRDPEND);
 483         wake_up(&ucs->waitqueue);
 484
 485         if (!ucs->rcvbuf_size) {
 486                 dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
 487                 return;
 488         }
 489
 490         del_timer(&ucs->timer_cmd_in);
 491
 492         switch (status) {
 493         case 0:                         /* normal completion */
 494                 numbytes = urb->actual_length;
 495                 if (unlikely(numbytes != ucs->rcvbuf_size)) {
 496                         dev_warn(cs->dev,
 497                                "control read: received %d chars, expected %d\n",
 498                                  numbytes, ucs->rcvbuf_size);
 499                         if (numbytes > ucs->rcvbuf_size)
 500                                 numbytes = ucs->rcvbuf_size;
 501                 }
 502
 503                 /* copy received bytes to inbuf */
 504                 have_data = gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes);
 505
 506                 if (unlikely(numbytes < ucs->rcvbuf_size)) {
 507                         /* incomplete - resubmit for remaining bytes */
 508                         ucs->rcvbuf_size -= numbytes;
 509                         ucs->retry_cmd_in = 0;
 510                         rc = atread_submit(cs, BAS_TIMEOUT);
 511                         if (rc >= 0 || rc == -ENODEV)
 512                                 /* resubmitted or disconnected */
 513                                 /* - bypass regular exit block */
 514                                 return;
 515                         error_reset(cs);
 516                 }
 517                 break;
 518
 519         case -ENOENT:                   /* cancelled */
 520         case -ECONNRESET:               /* cancelled (async) */
 521         case -EINPROGRESS:              /* pending */
 522         case -ENODEV:                   /* device removed */
 523         case -ESHUTDOWN:                /* device shut down */
 524                 /* no action necessary */
 525                 gig_dbg(DEBUG_USBREQ, "%s: %s",
 526                         __func__, get_usb_statmsg(status));
 527                 break;
 528
 529         default:                        /* severe trouble */
 530                 dev_warn(cs->dev, "control read: %s\n",
 531                          get_usb_statmsg(status));
 532                 if (ucs->retry_cmd_in++ < BAS_RETRY) {
 533                         dev_notice(cs->dev, "control read: retry %d\n",
 534                                    ucs->retry_cmd_in);
 535                         rc = atread_submit(cs, BAS_TIMEOUT);
 536                         if (rc >= 0 || rc == -ENODEV)
 537                                 /* resubmitted or disconnected */
 538                                 /* - bypass regular exit block */
 539                                 return;
 540                 } else {
 541                         dev_err(cs->dev,
 542                                 "control read: giving up after %d tries\n",
 543                                 ucs->retry_cmd_in);
 544                 }
 545                 error_reset(cs);
 546         }
 547
 548         kfree(ucs->rcvbuf);
 549         ucs->rcvbuf = NULL;
 550         ucs->rcvbuf_size = 0;
 551         if (have_data) {
 552                 gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
 553                 gigaset_schedule_event(cs);
 554         }
 555 }
 556
 557 /* atread_submit
 558  * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
 559  * parameters:
 560  *      cs      controller state structure
 561  *      timeout timeout in 1/10 sec., 0: none
 562  * return value:
 563  *      0 on success
 564  *      -EBUSY if another request is pending
 565  *      any URB submission error code
 566  */
 567 static int atread_submit(struct cardstate *cs, int timeout)
 568 {
 569         struct bas_cardstate *ucs = cs->hw.bas;
 570         int basstate;
 571         int ret;
 572
 573         gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
 574                 ucs->rcvbuf_size);
 575
 576         basstate = update_basstate(ucs, BS_ATRDPEND, 0);
 577         if (basstate & BS_ATRDPEND) {
 578                 dev_err(cs->dev,
 579                         "could not submit HD_READ_ATMESSAGE: URB busy\n");
 580                 return -EBUSY;
 581         }
 582
 583         if (basstate & BS_SUSPEND) {
 584                 dev_notice(cs->dev,
 585                            "HD_READ_ATMESSAGE not submitted, "
 586                            "suspend in progress\n");
 587                 update_basstate(ucs, 0, BS_ATRDPEND);
 588                 /* treat like disconnect */
 589                 return -ENODEV;
 590         }
 591
 592         ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
 593         ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
 594         ucs->dr_cmd_in.wValue = 0;
 595         ucs->dr_cmd_in.wIndex = 0;
 596         ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
 597         usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
 598                              usb_rcvctrlpipe(ucs->udev, 0),
 599                              (unsigned char *) &ucs->dr_cmd_in,
 600                              ucs->rcvbuf, ucs->rcvbuf_size,
 601                              read_ctrl_callback, cs->inbuf);
 602
 603         ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC);
 604         if (ret != 0) {
 605                 update_basstate(ucs, 0, BS_ATRDPEND);
 606                 dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
 607                         get_usb_rcmsg(ret));
 608                 return ret;
 609         }
 610
 611         if (timeout > 0) {
 612                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
 613                 ucs->timer_cmd_in.expires = jiffies + timeout * HZ / 10;
 614                 ucs->timer_cmd_in.data = (unsigned long) cs;
 615                 ucs->timer_cmd_in.function = cmd_in_timeout;
 616                 add_timer(&ucs->timer_cmd_in);
 617         }
 618         return 0;
 619 }
 620
 621 /* read_int_callback
 622  * USB completion handler for interrupt pipe input
 623  * called by the USB subsystem in interrupt context
 624  * parameter:
 625  *      urb     USB request block
 626  *              urb->context = controller state structure
 627  */
 628 static void read_int_callback(struct urb *urb)
 629 {
 630         struct cardstate *cs = urb->context;
 631         struct bas_cardstate *ucs = cs->hw.bas;
 632         struct bc_state *bcs;
 633         int status = urb->status;
 634         unsigned long flags;
 635         int rc;
 636         unsigned l;
 637         int channel;
 638
 639         switch (status) {
 640         case 0:                 /* success */
 641                 break;
 642         case -ENOENT:                   /* cancelled */
 643         case -ECONNRESET:               /* cancelled (async) */
 644         case -EINPROGRESS:              /* pending */
 645                 /* ignore silently */
 646                 gig_dbg(DEBUG_USBREQ, "%s: %s",
 647                         __func__, get_usb_statmsg(status));
 648                 return;
 649         case -ENODEV:                   /* device removed */
 650         case -ESHUTDOWN:                /* device shut down */
 651                 gig_dbg(DEBUG_USBREQ, "%s: device disconnected", __func__);
 652                 return;
 653         default:                /* severe trouble */
 654                 dev_warn(cs->dev, "interrupt read: %s\n",
 655                          get_usb_statmsg(status));
 656                 goto resubmit;
 657         }
 658
 659         /* drop incomplete packets even if the missing bytes wouldn't matter */
 660         if (unlikely(urb->actual_length < IP_MSGSIZE)) {
 661                 dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
 662                          urb->actual_length);
 663                 goto resubmit;
 664         }
 665
 666         l = (unsigned) ucs->int_in_buf[1] +
 667             (((unsigned) ucs->int_in_buf[2]) << 8);
 668
 669         gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
 670                 urb->actual_length, (int)ucs->int_in_buf[0], l,
 671                 (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
 672
 673         channel = 0;
 674
 675         switch (ucs->int_in_buf[0]) {
 676         case HD_DEVICE_INIT_OK:
 677                 update_basstate(ucs, BS_INIT, 0);
 678                 break;
 679
 680         case HD_READY_SEND_ATDATA:
 681                 del_timer(&ucs->timer_atrdy);
 682                 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
 683                 start_cbsend(cs);
 684                 break;
 685
 686         case HD_OPEN_B2CHANNEL_ACK:
 687                 ++channel;
 688         case HD_OPEN_B1CHANNEL_ACK:
 689                 bcs = cs->bcs + channel;
 690                 update_basstate(ucs, BS_B1OPEN << channel, 0);
 691                 gigaset_bchannel_up(bcs);
 692                 break;
 693
 694         case HD_OPEN_ATCHANNEL_ACK:
 695                 update_basstate(ucs, BS_ATOPEN, 0);
 696                 start_cbsend(cs);
 697                 break;
 698
 699         case HD_CLOSE_B2CHANNEL_ACK:
 700                 ++channel;
 701         case HD_CLOSE_B1CHANNEL_ACK:
 702                 bcs = cs->bcs + channel;
 703                 update_basstate(ucs, 0, BS_B1OPEN << channel);
 704                 stopurbs(bcs->hw.bas);
 705                 gigaset_bchannel_down(bcs);
 706                 break;
 707
 708         case HD_CLOSE_ATCHANNEL_ACK:
 709                 update_basstate(ucs, 0, BS_ATOPEN);
 710                 break;
 711
 712         case HD_B2_FLOW_CONTROL:
 713                 ++channel;
 714         case HD_B1_FLOW_CONTROL:
 715                 bcs = cs->bcs + channel;
 716                 atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
 717                            &bcs->hw.bas->corrbytes);
 718                 gig_dbg(DEBUG_ISO,
 719                         "Flow control (channel %d, sub %d): 0x%02x => %d",
 720                         channel, bcs->hw.bas->numsub, l,
 721                         atomic_read(&bcs->hw.bas->corrbytes));
 722                 break;
 723
 724         case HD_RECEIVEATDATA_ACK:      /* AT response ready to be received */
 725                 if (!l) {
 726                         dev_warn(cs->dev,
 727                                 "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
 728                         break;
 729                 }
 730                 spin_lock_irqsave(&cs->lock, flags);
 731                 if (ucs->rcvbuf_size) {
 732                         /* throw away previous buffer - we have no queue */
 733                         dev_err(cs->dev,
 734                                 "receive AT data overrun, %d bytes lost\n",
 735                                 ucs->rcvbuf_size);
 736                         kfree(ucs->rcvbuf);
 737                         ucs->rcvbuf_size = 0;
 738                 }
 739                 ucs->rcvbuf = kmalloc(l, GFP_ATOMIC);
 740                 if (ucs->rcvbuf == NULL) {
 741                         spin_unlock_irqrestore(&cs->lock, flags);
 742                         dev_err(cs->dev, "out of memory receiving AT data\n");
 743                         error_reset(cs);
 744                         break;
 745                 }
 746                 ucs->rcvbuf_size = l;
 747                 ucs->retry_cmd_in = 0;
 748                 rc = atread_submit(cs, BAS_TIMEOUT);
 749                 if (rc < 0) {
 750                         kfree(ucs->rcvbuf);
 751                         ucs->rcvbuf = NULL;
 752                         ucs->rcvbuf_size = 0;
 753                         if (rc != -ENODEV) {
 754                                 spin_unlock_irqrestore(&cs->lock, flags);
 755                                 error_reset(cs);
 756                                 break;
 757                         }
 758                 }
 759                 spin_unlock_irqrestore(&cs->lock, flags);
 760                 break;
 761
 762         case HD_RESET_INTERRUPT_PIPE_ACK:
 763                 update_basstate(ucs, 0, BS_RESETTING);
 764                 dev_notice(cs->dev, "interrupt pipe reset\n");
 765                 break;
 766
 767         case HD_SUSPEND_END:
 768                 gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
 769                 break;
 770
 771         default:
 772                 dev_warn(cs->dev,
 773                          "unknown Gigaset signal 0x%02x (%u) ignored\n",
 774                          (int) ucs->int_in_buf[0], l);
 775         }
 776
 777         check_pending(ucs);
 778         wake_up(&ucs->waitqueue);
 779
 780 resubmit:
 781         rc = usb_submit_urb(urb, GFP_ATOMIC);
 782         if (unlikely(rc != 0 && rc != -ENODEV)) {
 783                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
 784                         get_usb_rcmsg(rc));
 785                 error_reset(cs);
 786         }
 787 }
 788
 789 /* read_iso_callback
 790  * USB completion handler for B channel isochronous input
 791  * called by the USB subsystem in interrupt context
 792  * parameter:
 793  *      urb     USB request block of completed request
 794  *              urb->context = bc_state structure
 795  */
 796 static void read_iso_callback(struct urb *urb)
 797 {
 798         struct bc_state *bcs;
 799         struct bas_bc_state *ubc;
 800         int status = urb->status;
 801         unsigned long flags;
 802         int i, rc;
 803
 804         /* status codes not worth bothering the tasklet with */
 805         if (unlikely(status == -ENOENT ||
 806                      status == -ECONNRESET ||
 807                      status == -EINPROGRESS ||
 808                      status == -ENODEV ||
 809                      status == -ESHUTDOWN)) {
 810                 gig_dbg(DEBUG_ISO, "%s: %s",
 811                         __func__, get_usb_statmsg(status));
 812                 return;
 813         }
 814
 815         bcs = urb->context;
 816         ubc = bcs->hw.bas;
 817
 818         spin_lock_irqsave(&ubc->isoinlock, flags);
 819         if (likely(ubc->isoindone == NULL)) {
 820                 /* pass URB to tasklet */
 821                 ubc->isoindone = urb;
 822                 ubc->isoinstatus = status;
 823                 tasklet_hi_schedule(&ubc->rcvd_tasklet);
 824         } else {
 825                 /* tasklet still busy, drop data and resubmit URB */
 826                 ubc->loststatus = status;
 827                 for (i = 0; i < BAS_NUMFRAMES; i++) {
 828                         ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
 829                         if (unlikely(urb->iso_frame_desc[i].status != 0 &&
 830                                      urb->iso_frame_desc[i].status !=
 831                                                                 -EINPROGRESS))
 832                                 ubc->loststatus = urb->iso_frame_desc[i].status;
 833                         urb->iso_frame_desc[i].status = 0;
 834                         urb->iso_frame_desc[i].actual_length = 0;
 835                 }
 836                 if (likely(ubc->running)) {
 837                         /* urb->dev is clobbered by USB subsystem */
 838                         urb->dev = bcs->cs->hw.bas->udev;
 839                         urb->transfer_flags = URB_ISO_ASAP;
 840                         urb->number_of_packets = BAS_NUMFRAMES;
 841                         gig_dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit",
 842                                 __func__);
 843                         rc = usb_submit_urb(urb, GFP_ATOMIC);
 844                         if (unlikely(rc != 0 && rc != -ENODEV)) {
 845                                 dev_err(bcs->cs->dev,
 846                                         "could not resubmit isochronous read "
 847                                         "URB: %s\n", get_usb_rcmsg(rc));
 848                                 dump_urb(DEBUG_ISO, "isoc read", urb);
 849                                 error_hangup(bcs);
 850                         }
 851                 }
 852         }
 853         spin_unlock_irqrestore(&ubc->isoinlock, flags);
 854 }
 855
 856 /* write_iso_callback
 857  * USB completion handler for B channel isochronous output
 858  * called by the USB subsystem in interrupt context
 859  * parameter:
 860  *      urb     USB request block of completed request
 861  *              urb->context = isow_urbctx_t structure
 862  */
 863 static void write_iso_callback(struct urb *urb)
 864 {
 865         struct isow_urbctx_t *ucx;
 866         struct bas_bc_state *ubc;
 867         int status = urb->status;
 868         unsigned long flags;
 869
 870         /* status codes not worth bothering the tasklet with */
 871         if (unlikely(status == -ENOENT ||
 872                      status == -ECONNRESET ||
 873                      status == -EINPROGRESS ||
 874                      status == -ENODEV ||
 875                      status == -ESHUTDOWN)) {
 876                 gig_dbg(DEBUG_ISO, "%s: %s",
 877                         __func__, get_usb_statmsg(status));
 878                 return;
 879         }
 880
 881         /* pass URB context to tasklet */
 882         ucx = urb->context;
 883         ubc = ucx->bcs->hw.bas;
 884         ucx->status = status;
 885
 886         spin_lock_irqsave(&ubc->isooutlock, flags);
 887         ubc->isooutovfl = ubc->isooutdone;
 888         ubc->isooutdone = ucx;
 889         spin_unlock_irqrestore(&ubc->isooutlock, flags);
 890         tasklet_hi_schedule(&ubc->sent_tasklet);
 891 }
 892
 893 /* starturbs
 894  * prepare and submit USB request blocks for isochronous input and output
 895  * argument:
 896  *      B channel control structure
 897  * return value:
 898  *      0 on success
 899  *      < 0 on error (no URBs submitted)
 900  */
 901 static int starturbs(struct bc_state *bcs)
 902 {
 903         struct bas_bc_state *ubc = bcs->hw.bas;
 904         struct urb *urb;
 905         int j, k;
 906         int rc;
 907
 908         /* initialize L2 reception */
 909         if (bcs->proto2 == L2_HDLC)
 910                 bcs->inputstate |= INS_flag_hunt;
 911
 912         /* submit all isochronous input URBs */
 913         ubc->running = 1;
 914         for (k = 0; k < BAS_INURBS; k++) {
 915                 urb = ubc->isoinurbs[k];
 916                 if (!urb) {
 917                         rc = -EFAULT;
 918                         goto error;
 919                 }
 920
 921                 urb->dev = bcs->cs->hw.bas->udev;
 922                 urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
 923                 urb->transfer_flags = URB_ISO_ASAP;
 924                 urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
 925                 urb->transfer_buffer_length = BAS_INBUFSIZE;
 926                 urb->number_of_packets = BAS_NUMFRAMES;
 927                 urb->interval = BAS_FRAMETIME;
 928                 urb->complete = read_iso_callback;
 929                 urb->context = bcs;
 930                 for (j = 0; j < BAS_NUMFRAMES; j++) {
 931                         urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
 932                         urb->iso_frame_desc[j].length = BAS_MAXFRAME;
 933                         urb->iso_frame_desc[j].status = 0;
 934                         urb->iso_frame_desc[j].actual_length = 0;
 935                 }
 936
 937                 dump_urb(DEBUG_ISO, "Initial isoc read", urb);
 938                 rc = usb_submit_urb(urb, GFP_ATOMIC);
 939                 if (rc != 0)
 940                         goto error;
 941         }
 942
 943         /* initialize L2 transmission */
 944         gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
 945
 946         /* set up isochronous output URBs for flag idling */
 947         for (k = 0; k < BAS_OUTURBS; ++k) {
 948                 urb = ubc->isoouturbs[k].urb;
 949                 if (!urb) {
 950                         rc = -EFAULT;
 951                         goto error;
 952                 }
 953                 urb->dev = bcs->cs->hw.bas->udev;
 954                 urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
 955                 urb->transfer_flags = URB_ISO_ASAP;
 956                 urb->transfer_buffer = ubc->isooutbuf->data;
 957                 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
 958                 urb->number_of_packets = BAS_NUMFRAMES;
 959                 urb->interval = BAS_FRAMETIME;
 960                 urb->complete = write_iso_callback;
 961                 urb->context = &ubc->isoouturbs[k];
 962                 for (j = 0; j < BAS_NUMFRAMES; ++j) {
 963                         urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
 964                         urb->iso_frame_desc[j].length = BAS_NORMFRAME;
 965                         urb->iso_frame_desc[j].status = 0;
 966                         urb->iso_frame_desc[j].actual_length = 0;
 967                 }
 968                 ubc->isoouturbs[k].limit = -1;
 969         }
 970
 971         /* keep one URB free, submit the others */
 972         for (k = 0; k < BAS_OUTURBS-1; ++k) {
 973                 dump_urb(DEBUG_ISO, "Initial isoc write", urb);
 974                 rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
 975                 if (rc != 0)
 976                         goto error;
 977         }
 978         dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
 979         ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS-1];
 980         ubc->isooutdone = ubc->isooutovfl = NULL;
 981         return 0;
 982  error:
 983         stopurbs(ubc);
 984         return rc;
 985 }
 986
 987 /* stopurbs
 988  * cancel the USB request blocks for isochronous input and output
 989  * errors are silently ignored
 990  * argument:
 991  *      B channel control structure
 992  */
 993 static void stopurbs(struct bas_bc_state *ubc)
 994 {
 995         int k, rc;
 996
 997         ubc->running = 0;
 998
 999         for (k = 0; k < BAS_INURBS; ++k) {
1000                 rc = usb_unlink_urb(ubc->isoinurbs[k]);
1001                 gig_dbg(DEBUG_ISO,
1002                         "%s: isoc input URB %d unlinked, result = %s",
1003                         __func__, k, get_usb_rcmsg(rc));
1004         }
1005
1006         for (k = 0; k < BAS_OUTURBS; ++k) {
1007                 rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
1008                 gig_dbg(DEBUG_ISO,
1009                         "%s: isoc output URB %d unlinked, result = %s",
1010                         __func__, k, get_usb_rcmsg(rc));
1011         }
1012 }
1013
1014 /* Isochronous Write - Bottom Half */
1015 /* =============================== */
1016
1017 /* submit_iso_write_urb
1018  * fill and submit the next isochronous write URB
1019  * parameters:
1020  *      ucx     context structure containing URB
1021  * return value:
1022  *      number of frames submitted in URB
1023  *      0 if URB not submitted because no data available (isooutbuf busy)
1024  *      error code < 0 on error
1025  */
1026 static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
1027 {
1028         struct urb *urb = ucx->urb;
1029         struct bas_bc_state *ubc = ucx->bcs->hw.bas;
1030         struct usb_iso_packet_descriptor *ifd;
1031         int corrbytes, nframe, rc;
1032
1033         /* urb->dev is clobbered by USB subsystem */
1034         urb->dev = ucx->bcs->cs->hw.bas->udev;
1035         urb->transfer_flags = URB_ISO_ASAP;
1036         urb->transfer_buffer = ubc->isooutbuf->data;
1037         urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1038
1039         for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
1040                 ifd = &urb->iso_frame_desc[nframe];
1041
1042                 /* compute frame length according to flow control */
1043                 ifd->length = BAS_NORMFRAME;
1044                 corrbytes = atomic_read(&ubc->corrbytes);
1045                 if (corrbytes != 0) {
1046                         gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
1047                                 __func__, corrbytes);
1048                         if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
1049                                 corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
1050                         else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
1051                                 corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
1052                         ifd->length += corrbytes;
1053                         atomic_add(-corrbytes, &ubc->corrbytes);
1054                 }
1055
1056                 /* retrieve block of data to send */
1057                 rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
1058                 if (rc < 0) {
1059                         if (rc == -EBUSY) {
1060                                 gig_dbg(DEBUG_ISO,
1061                                         "%s: buffer busy at frame %d",
1062                                         __func__, nframe);
1063                                 /* tasklet will be restarted from
1064                                    gigaset_isoc_send_skb() */
1065                         } else {
1066                                 dev_err(ucx->bcs->cs->dev,
1067                                         "%s: buffer error %d at frame %d\n",
1068                                         __func__, rc, nframe);
1069                                 return rc;
1070                         }
1071                         break;
1072                 }
1073                 ifd->offset = rc;
1074                 ucx->limit = ubc->isooutbuf->nextread;
1075                 ifd->status = 0;
1076                 ifd->actual_length = 0;
1077         }
1078         if (unlikely(nframe == 0))
1079                 return 0;       /* no data to send */
1080         urb->number_of_packets = nframe;
1081
1082         rc = usb_submit_urb(urb, GFP_ATOMIC);
1083         if (unlikely(rc)) {
1084                 if (rc == -ENODEV)
1085                         /* device removed - give up silently */
1086                         gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
1087                 else
1088                         dev_err(ucx->bcs->cs->dev,
1089                                 "could not submit isochronous write URB: %s\n",
1090                                 get_usb_rcmsg(rc));
1091                 return rc;
1092         }
1093         ++ubc->numsub;
1094         return nframe;
1095 }
1096
1097 /* write_iso_tasklet
1098  * tasklet scheduled when an isochronous output URB from the Gigaset device
1099  * has completed
1100  * parameter:
1101  *      data    B channel state structure
1102  */
1103 static void write_iso_tasklet(unsigned long data)
1104 {
1105         struct bc_state *bcs = (struct bc_state *) data;
1106         struct bas_bc_state *ubc = bcs->hw.bas;
1107         struct cardstate *cs = bcs->cs;
1108         struct isow_urbctx_t *done, *next, *ovfl;
1109         struct urb *urb;
1110         int status;
1111         struct usb_iso_packet_descriptor *ifd;
1112         int offset;
1113         unsigned long flags;
1114         int i;
1115         struct sk_buff *skb;
1116         int len;
1117         int rc;
1118
1119         /* loop while completed URBs arrive in time */
1120         for (;;) {
1121                 if (unlikely(!(ubc->running))) {
1122                         gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1123                         return;
1124                 }
1125
1126                 /* retrieve completed URBs */
1127                 spin_lock_irqsave(&ubc->isooutlock, flags);
1128                 done = ubc->isooutdone;
1129                 ubc->isooutdone = NULL;
1130                 ovfl = ubc->isooutovfl;
1131                 ubc->isooutovfl = NULL;
1132                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1133                 if (ovfl) {
1134                         dev_err(cs->dev, "isochronous write buffer underrun\n");
1135                         error_hangup(bcs);
1136                         break;
1137                 }
1138                 if (!done)
1139                         break;
1140
1141                 /* submit free URB if available */
1142                 spin_lock_irqsave(&ubc->isooutlock, flags);
1143                 next = ubc->isooutfree;
1144                 ubc->isooutfree = NULL;
1145                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1146                 if (next) {
1147                         rc = submit_iso_write_urb(next);
1148                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1149                                 /* could not submit URB, put it back */
1150                                 spin_lock_irqsave(&ubc->isooutlock, flags);
1151                                 if (ubc->isooutfree == NULL) {
1152                                         ubc->isooutfree = next;
1153                                         next = NULL;
1154                                 }
1155                                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1156                                 if (next) {
1157                                         /* couldn't put it back */
1158                                         dev_err(cs->dev,
1159                                               "losing isochronous write URB\n");
1160                                         error_hangup(bcs);
1161                                 }
1162                         }
1163                 }
1164
1165                 /* process completed URB */
1166                 urb = done->urb;
1167                 status = done->status;
1168                 switch (status) {
1169                 case -EXDEV:                    /* partial completion */
1170                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1171                                 __func__);
1172                         /* fall through - what's the difference anyway? */
1173                 case 0:                         /* normal completion */
1174                         /* inspect individual frames
1175                          * assumptions (for lack of documentation):
1176                          * - actual_length bytes of first frame in error are
1177                          *   successfully sent
1178                          * - all following frames are not sent at all
1179                          */
1180                         offset = done->limit;   /* default (no error) */
1181                         for (i = 0; i < BAS_NUMFRAMES; i++) {
1182                                 ifd = &urb->iso_frame_desc[i];
1183                                 if (ifd->status ||
1184                                     ifd->actual_length != ifd->length) {
1185                                         dev_warn(cs->dev,
1186                                              "isochronous write: frame %d: %s, "
1187                                              "only %d of %d bytes sent\n",
1188                                              i, get_usb_statmsg(ifd->status),
1189                                              ifd->actual_length, ifd->length);
1190                                         offset = (ifd->offset +
1191                                                   ifd->actual_length)
1192                                                  % BAS_OUTBUFSIZE;
1193                                         break;
1194                                 }
1195                         }
1196 #ifdef CONFIG_GIGASET_DEBUG
1197                         /* check assumption on remaining frames */
1198                         for (; i < BAS_NUMFRAMES; i++) {
1199                                 ifd = &urb->iso_frame_desc[i];
1200                                 if (ifd->status != -EINPROGRESS
1201                                     || ifd->actual_length != 0) {
1202                                         dev_warn(cs->dev,
1203                                              "isochronous write: frame %d: %s, "
1204                                              "%d of %d bytes sent\n",
1205                                              i, get_usb_statmsg(ifd->status),
1206                                              ifd->actual_length, ifd->length);
1207                                         offset = (ifd->offset +
1208                                                   ifd->actual_length)
1209                                                  % BAS_OUTBUFSIZE;
1210                                         break;
1211                                 }
1212                         }
1213 #endif
1214                         break;
1215                 case -EPIPE:                    /* stall - probably underrun */
1216                         dev_err(cs->dev, "isochronous write stalled\n");
1217                         error_hangup(bcs);
1218                         break;
1219                 default:                        /* severe trouble */
1220                         dev_warn(cs->dev, "isochronous write: %s\n",
1221                                  get_usb_statmsg(status));
1222                 }
1223
1224                 /* mark the write buffer area covered by this URB as free */
1225                 if (done->limit >= 0)
1226                         ubc->isooutbuf->read = done->limit;
1227
1228                 /* mark URB as free */
1229                 spin_lock_irqsave(&ubc->isooutlock, flags);
1230                 next = ubc->isooutfree;
1231                 ubc->isooutfree = done;
1232                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1233                 if (next) {
1234                         /* only one URB still active - resubmit one */
1235                         rc = submit_iso_write_urb(next);
1236                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1237                                 /* couldn't submit */
1238                                 error_hangup(bcs);
1239                         }
1240                 }
1241         }
1242
1243         /* process queued SKBs */
1244         while ((skb = skb_dequeue(&bcs->squeue))) {
1245                 /* copy to output buffer, doing L2 encapsulation */
1246                 len = skb->len;
1247                 if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
1248                         /* insufficient buffer space, push back onto queue */
1249                         skb_queue_head(&bcs->squeue, skb);
1250                         gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
1251                                 __func__, skb_queue_len(&bcs->squeue));
1252                         break;
1253                 }
1254                 skb_pull(skb, len);
1255                 gigaset_skb_sent(bcs, skb);
1256                 dev_kfree_skb_any(skb);
1257         }
1258 }
1259
1260 /* Isochronous Read - Bottom Half */
1261 /* ============================== */
1262
1263 /* read_iso_tasklet
1264  * tasklet scheduled when an isochronous input URB from the Gigaset device
1265  * has completed
1266  * parameter:
1267  *      data    B channel state structure
1268  */
1269 static void read_iso_tasklet(unsigned long data)
1270 {
1271         struct bc_state *bcs = (struct bc_state *) data;
1272         struct bas_bc_state *ubc = bcs->hw.bas;
1273         struct cardstate *cs = bcs->cs;
1274         struct urb *urb;
1275         int status;
1276         char *rcvbuf;
1277         unsigned long flags;
1278         int totleft, numbytes, offset, frame, rc;
1279
1280         /* loop while more completed URBs arrive in the meantime */
1281         for (;;) {
1282                 /* retrieve URB */
1283                 spin_lock_irqsave(&ubc->isoinlock, flags);
1284                 urb = ubc->isoindone;
1285                 if (!urb) {
1286                         spin_unlock_irqrestore(&ubc->isoinlock, flags);
1287                         return;
1288                 }
1289                 status = ubc->isoinstatus;
1290                 ubc->isoindone = NULL;
1291                 if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1292                         dev_warn(cs->dev,
1293                                  "isochronous read overrun, "
1294                                  "dropped URB with status: %s, %d bytes lost\n",
1295                                  get_usb_statmsg(ubc->loststatus),
1296                                  ubc->isoinlost);
1297                         ubc->loststatus = -EINPROGRESS;
1298                 }
1299                 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1300
1301                 if (unlikely(!(ubc->running))) {
1302                         gig_dbg(DEBUG_ISO,
1303                                 "%s: channel not running, "
1304                                 "dropped URB with status: %s",
1305                                 __func__, get_usb_statmsg(status));
1306                         return;
1307                 }
1308
1309                 switch (status) {
1310                 case 0:                         /* normal completion */
1311                         break;
1312                 case -EXDEV:                    /* inspect individual frames
1313                                                    (we do that anyway) */
1314                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1315                                 __func__);
1316                         break;
1317                 case -ENOENT:
1318                 case -ECONNRESET:
1319                 case -EINPROGRESS:
1320                         gig_dbg(DEBUG_ISO, "%s: %s",
1321                                 __func__, get_usb_statmsg(status));
1322                         continue;               /* -> skip */
1323                 case -EPIPE:
1324                         dev_err(cs->dev, "isochronous read stalled\n");
1325                         error_hangup(bcs);
1326                         continue;               /* -> skip */
1327                 default:                        /* severe trouble */
1328                         dev_warn(cs->dev, "isochronous read: %s\n",
1329                                  get_usb_statmsg(status));
1330                         goto error;
1331                 }
1332
1333                 rcvbuf = urb->transfer_buffer;
1334                 totleft = urb->actual_length;
1335                 for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1336                         numbytes = urb->iso_frame_desc[frame].actual_length;
1337                         if (unlikely(urb->iso_frame_desc[frame].status))
1338                                 dev_warn(cs->dev,
1339                                          "isochronous read: frame %d[%d]: %s\n",
1340                                          frame, numbytes,
1341                                          get_usb_statmsg(
1342                                             urb->iso_frame_desc[frame].status));
1343                         if (unlikely(numbytes > BAS_MAXFRAME))
1344                                 dev_warn(cs->dev,
1345                                          "isochronous read: frame %d: "
1346                                          "numbytes (%d) > BAS_MAXFRAME\n",
1347                                          frame, numbytes);
1348                         if (unlikely(numbytes > totleft)) {
1349                                 dev_warn(cs->dev,
1350                                          "isochronous read: frame %d: "
1351                                          "numbytes (%d) > totleft (%d)\n",
1352                                          frame, numbytes, totleft);
1353                                 numbytes = totleft;
1354                         }
1355                         offset = urb->iso_frame_desc[frame].offset;
1356                         if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1357                                 dev_warn(cs->dev,
1358                                          "isochronous read: frame %d: "
1359                                          "offset (%d) + numbytes (%d) "
1360                                          "> BAS_INBUFSIZE\n",
1361                                          frame, offset, numbytes);
1362                                 numbytes = BAS_INBUFSIZE - offset;
1363                         }
1364                         gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1365                         totleft -= numbytes;
1366                 }
1367                 if (unlikely(totleft > 0))
1368                         dev_warn(cs->dev,
1369                                  "isochronous read: %d data bytes missing\n",
1370                                  totleft);
1371
1372 error:
1373                 /* URB processed, resubmit */
1374                 for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1375                         urb->iso_frame_desc[frame].status = 0;
1376                         urb->iso_frame_desc[frame].actual_length = 0;
1377                 }
1378                 /* urb->dev is clobbered by USB subsystem */
1379                 urb->dev = bcs->cs->hw.bas->udev;
1380                 urb->transfer_flags = URB_ISO_ASAP;
1381                 urb->number_of_packets = BAS_NUMFRAMES;
1382                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1383                 if (unlikely(rc != 0 && rc != -ENODEV)) {
1384                         dev_err(cs->dev,
1385                                 "could not resubmit isochronous read URB: %s\n",
1386                                 get_usb_rcmsg(rc));
1387                         dump_urb(DEBUG_ISO, "resubmit iso read", urb);
1388                         error_hangup(bcs);
1389                 }
1390         }
1391 }
1392
1393 /* Channel Operations */
1394 /* ================== */
1395
1396 /* req_timeout
1397  * timeout routine for control output request
1398  * argument:
1399  *      B channel control structure
1400  */
1401 static void req_timeout(unsigned long data)
1402 {
1403         struct bc_state *bcs = (struct bc_state *) data;
1404         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1405         int pending;
1406         unsigned long flags;
1407
1408         check_pending(ucs);
1409
1410         spin_lock_irqsave(&ucs->lock, flags);
1411         pending = ucs->pending;
1412         ucs->pending = 0;
1413         spin_unlock_irqrestore(&ucs->lock, flags);
1414
1415         switch (pending) {
1416         case 0:                                 /* no pending request */
1417                 gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1418                 break;
1419
1420         case HD_OPEN_ATCHANNEL:
1421                 dev_err(bcs->cs->dev, "timeout opening AT channel\n");
1422                 error_reset(bcs->cs);
1423                 break;
1424
1425         case HD_OPEN_B2CHANNEL:
1426         case HD_OPEN_B1CHANNEL:
1427                 dev_err(bcs->cs->dev, "timeout opening channel %d\n",
1428                         bcs->channel + 1);
1429                 error_hangup(bcs);
1430                 break;
1431
1432         case HD_CLOSE_ATCHANNEL:
1433                 dev_err(bcs->cs->dev, "timeout closing AT channel\n");
1434                 error_reset(bcs->cs);
1435                 break;
1436
1437         case HD_CLOSE_B2CHANNEL:
1438         case HD_CLOSE_B1CHANNEL:
1439                 dev_err(bcs->cs->dev, "timeout closing channel %d\n",
1440                         bcs->channel + 1);
1441                 error_reset(bcs->cs);
1442                 break;
1443
1444         case HD_RESET_INTERRUPT_PIPE:
1445                 /* error recovery escalation */
1446                 dev_err(bcs->cs->dev,
1447                         "reset interrupt pipe timeout, attempting USB reset\n");
1448                 usb_queue_reset_device(bcs->cs->hw.bas->interface);
1449                 break;
1450
1451         default:
1452                 dev_warn(bcs->cs->dev, "request 0x%02x timed out, clearing\n",
1453                          pending);
1454         }
1455
1456         wake_up(&ucs->waitqueue);
1457 }
1458
1459 /* write_ctrl_callback
1460  * USB completion handler for control pipe output
1461  * called by the USB subsystem in interrupt context
1462  * parameter:
1463  *      urb     USB request block of completed request
1464  *              urb->context = hardware specific controller state structure
1465  */
1466 static void write_ctrl_callback(struct urb *urb)
1467 {
1468         struct bas_cardstate *ucs = urb->context;
1469         int status = urb->status;
1470         int rc;
1471         unsigned long flags;
1472
1473         /* check status */
1474         switch (status) {
1475         case 0:                                 /* normal completion */
1476                 spin_lock_irqsave(&ucs->lock, flags);
1477                 switch (ucs->pending) {
1478                 case HD_DEVICE_INIT_ACK:        /* no reply expected */
1479                         del_timer(&ucs->timer_ctrl);
1480                         ucs->pending = 0;
1481                         break;
1482                 }
1483                 spin_unlock_irqrestore(&ucs->lock, flags);
1484                 return;
1485
1486         case -ENOENT:                   /* cancelled */
1487         case -ECONNRESET:               /* cancelled (async) */
1488         case -EINPROGRESS:              /* pending */
1489         case -ENODEV:                   /* device removed */
1490         case -ESHUTDOWN:                /* device shut down */
1491                 /* ignore silently */
1492                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1493                         __func__, get_usb_statmsg(status));
1494                 break;
1495
1496         default:                                /* any failure */
1497                 /* don't retry if suspend requested */
1498                 if (++ucs->retry_ctrl > BAS_RETRY ||
1499                     (ucs->basstate & BS_SUSPEND)) {
1500                         dev_err(&ucs->interface->dev,
1501                                 "control request 0x%02x failed: %s\n",
1502                                 ucs->dr_ctrl.bRequest,
1503                                 get_usb_statmsg(status));
1504                         break;          /* give up */
1505                 }
1506                 dev_notice(&ucs->interface->dev,
1507                            "control request 0x%02x: %s, retry %d\n",
1508                            ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
1509                            ucs->retry_ctrl);
1510                 /* urb->dev is clobbered by USB subsystem */
1511                 urb->dev = ucs->udev;
1512                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1513                 if (unlikely(rc)) {
1514                         dev_err(&ucs->interface->dev,
1515                                 "could not resubmit request 0x%02x: %s\n",
1516                                 ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
1517                         break;
1518                 }
1519                 /* resubmitted */
1520                 return;
1521         }
1522
1523         /* failed, clear pending request */
1524         spin_lock_irqsave(&ucs->lock, flags);
1525         del_timer(&ucs->timer_ctrl);
1526         ucs->pending = 0;
1527         spin_unlock_irqrestore(&ucs->lock, flags);
1528         wake_up(&ucs->waitqueue);
1529 }
1530
1531 /* req_submit
1532  * submit a control output request without message buffer to the Gigaset base
1533  * and optionally start a timeout
1534  * parameters:
1535  *      bcs     B channel control structure
1536  *      req     control request code (HD_*)
1537  *      val     control request parameter value (set to 0 if unused)
1538  *      timeout timeout in seconds (0: no timeout)
1539  * return value:
1540  *      0 on success
1541  *      -EBUSY if another request is pending
1542  *      any URB submission error code
1543  */
1544 static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1545 {
1546         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1547         int ret;
1548         unsigned long flags;
1549
1550         gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1551
1552         spin_lock_irqsave(&ucs->lock, flags);
1553         if (ucs->pending) {
1554                 spin_unlock_irqrestore(&ucs->lock, flags);
1555                 dev_err(bcs->cs->dev,
1556                         "submission of request 0x%02x failed: "
1557                         "request 0x%02x still pending\n",
1558                         req, ucs->pending);
1559                 return -EBUSY;
1560         }
1561
1562         ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1563         ucs->dr_ctrl.bRequest = req;
1564         ucs->dr_ctrl.wValue = cpu_to_le16(val);
1565         ucs->dr_ctrl.wIndex = 0;
1566         ucs->dr_ctrl.wLength = 0;
1567         usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1568                              usb_sndctrlpipe(ucs->udev, 0),
1569                              (unsigned char *) &ucs->dr_ctrl, NULL, 0,
1570                              write_ctrl_callback, ucs);
1571         ucs->retry_ctrl = 0;
1572         ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
1573         if (unlikely(ret)) {
1574                 dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1575                         req, get_usb_rcmsg(ret));
1576                 spin_unlock_irqrestore(&ucs->lock, flags);
1577                 return ret;
1578         }
1579         ucs->pending = req;
1580
1581         if (timeout > 0) {
1582                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1583                 ucs->timer_ctrl.expires = jiffies + timeout * HZ / 10;
1584                 ucs->timer_ctrl.data = (unsigned long) bcs;
1585                 ucs->timer_ctrl.function = req_timeout;
1586                 add_timer(&ucs->timer_ctrl);
1587         }
1588
1589         spin_unlock_irqrestore(&ucs->lock, flags);
1590         return 0;
1591 }
1592
1593 /* gigaset_init_bchannel
1594  * called by common.c to connect a B channel
1595  * initialize isochronous I/O and tell the Gigaset base to open the channel
1596  * argument:
1597  *      B channel control structure
1598  * return value:
1599  *      0 on success, error code < 0 on error
1600  */
1601 static int gigaset_init_bchannel(struct bc_state *bcs)
1602 {
1603         struct cardstate *cs = bcs->cs;
1604         int req, ret;
1605         unsigned long flags;
1606
1607         spin_lock_irqsave(&cs->lock, flags);
1608         if (unlikely(!cs->connected)) {
1609                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1610                 spin_unlock_irqrestore(&cs->lock, flags);
1611                 return -ENODEV;
1612         }
1613
1614         if (cs->hw.bas->basstate & BS_SUSPEND) {
1615                 dev_notice(cs->dev,
1616                            "not starting isochronous I/O, "
1617                            "suspend in progress\n");
1618                 spin_unlock_irqrestore(&cs->lock, flags);
1619                 return -EHOSTUNREACH;
1620         }
1621
1622         ret = starturbs(bcs);
1623         if (ret < 0) {
1624                 dev_err(cs->dev,
1625                         "could not start isochronous I/O for channel B%d: %s\n",
1626                         bcs->channel + 1,
1627                         ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
1628                 if (ret != -ENODEV)
1629                         error_hangup(bcs);
1630                 spin_unlock_irqrestore(&cs->lock, flags);
1631                 return ret;
1632         }
1633
1634         req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1635         ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1636         if (ret < 0) {
1637                 dev_err(cs->dev, "could not open channel B%d\n",
1638                         bcs->channel + 1);
1639                 stopurbs(bcs->hw.bas);
1640                 if (ret != -ENODEV)
1641                         error_hangup(bcs);
1642         }
1643
1644         spin_unlock_irqrestore(&cs->lock, flags);
1645         return ret;
1646 }
1647
1648 /* gigaset_close_bchannel
1649  * called by common.c to disconnect a B channel
1650  * tell the Gigaset base to close the channel
1651  * stopping isochronous I/O and LL notification will be done when the
1652  * acknowledgement for the close arrives
1653  * argument:
1654  *      B channel control structure
1655  * return value:
1656  *      0 on success, error code < 0 on error
1657  */
1658 static int gigaset_close_bchannel(struct bc_state *bcs)
1659 {
1660         struct cardstate *cs = bcs->cs;
1661         int req, ret;
1662         unsigned long flags;
1663
1664         spin_lock_irqsave(&cs->lock, flags);
1665         if (unlikely(!cs->connected)) {
1666                 spin_unlock_irqrestore(&cs->lock, flags);
1667                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1668                 return -ENODEV;
1669         }
1670
1671         if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1672                 /* channel not running: just signal common.c */
1673                 spin_unlock_irqrestore(&cs->lock, flags);
1674                 gigaset_bchannel_down(bcs);
1675                 return 0;
1676         }
1677
1678         /* channel running: tell device to close it */
1679         req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1680         ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1681         if (ret < 0)
1682                 dev_err(cs->dev, "closing channel B%d failed\n",
1683                         bcs->channel + 1);
1684
1685         spin_unlock_irqrestore(&cs->lock, flags);
1686         return ret;
1687 }
1688
1689 /* Device Operations */
1690 /* ================= */
1691
1692 /* complete_cb
1693  * unqueue first command buffer from queue, waking any sleepers
1694  * must be called with cs->cmdlock held
1695  * parameter:
1696  *      cs      controller state structure
1697  */
1698 static void complete_cb(struct cardstate *cs)
1699 {
1700         struct cmdbuf_t *cb = cs->cmdbuf;
1701
1702         /* unqueue completed buffer */
1703         cs->cmdbytes -= cs->curlen;
1704         gig_dbg(DEBUG_OUTPUT, "write_command: sent %u bytes, %u left",
1705                 cs->curlen, cs->cmdbytes);
1706         if (cb->next != NULL) {
1707                 cs->cmdbuf = cb->next;
1708                 cs->cmdbuf->prev = NULL;
1709                 cs->curlen = cs->cmdbuf->len;
1710         } else {
1711                 cs->cmdbuf = NULL;
1712                 cs->lastcmdbuf = NULL;
1713                 cs->curlen = 0;
1714         }
1715
1716         if (cb->wake_tasklet)
1717                 tasklet_schedule(cb->wake_tasklet);
1718
1719         kfree(cb);
1720 }
1721
1722 /* write_command_callback
1723  * USB completion handler for AT command transmission
1724  * called by the USB subsystem in interrupt context
1725  * parameter:
1726  *      urb     USB request block of completed request
1727  *              urb->context = controller state structure
1728  */
1729 static void write_command_callback(struct urb *urb)
1730 {
1731         struct cardstate *cs = urb->context;
1732         struct bas_cardstate *ucs = cs->hw.bas;
1733         int status = urb->status;
1734         unsigned long flags;
1735
1736         update_basstate(ucs, 0, BS_ATWRPEND);
1737         wake_up(&ucs->waitqueue);
1738
1739         /* check status */
1740         switch (status) {
1741         case 0:                                 /* normal completion */
1742                 break;
1743         case -ENOENT:                   /* cancelled */
1744         case -ECONNRESET:               /* cancelled (async) */
1745         case -EINPROGRESS:              /* pending */
1746         case -ENODEV:                   /* device removed */
1747         case -ESHUTDOWN:                /* device shut down */
1748                 /* ignore silently */
1749                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1750                         __func__, get_usb_statmsg(status));
1751                 return;
1752         default:                                /* any failure */
1753                 if (++ucs->retry_cmd_out > BAS_RETRY) {
1754                         dev_warn(cs->dev,
1755                                  "command write: %s, "
1756                                  "giving up after %d retries\n",
1757                                  get_usb_statmsg(status),
1758                                  ucs->retry_cmd_out);
1759                         break;
1760                 }
1761                 if (ucs->basstate & BS_SUSPEND) {
1762                         dev_warn(cs->dev,
1763                                  "command write: %s, "
1764                                  "won't retry - suspend requested\n",
1765                                  get_usb_statmsg(status));
1766                         break;
1767                 }
1768                 if (cs->cmdbuf == NULL) {
1769                         dev_warn(cs->dev,
1770                                  "command write: %s, "
1771                                  "cannot retry - cmdbuf gone\n",
1772                                  get_usb_statmsg(status));
1773                         break;
1774                 }
1775                 dev_notice(cs->dev, "command write: %s, retry %d\n",
1776                            get_usb_statmsg(status), ucs->retry_cmd_out);
1777                 if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1778                         /* resubmitted - bypass regular exit block */
1779                         return;
1780                 /* command send failed, assume base still waiting */
1781                 update_basstate(ucs, BS_ATREADY, 0);
1782         }
1783
1784         spin_lock_irqsave(&cs->cmdlock, flags);
1785         if (cs->cmdbuf != NULL)
1786                 complete_cb(cs);
1787         spin_unlock_irqrestore(&cs->cmdlock, flags);
1788 }
1789
1790 /* atrdy_timeout
1791  * timeout routine for AT command transmission
1792  * argument:
1793  *      controller state structure
1794  */
1795 static void atrdy_timeout(unsigned long data)
1796 {
1797         struct cardstate *cs = (struct cardstate *) data;
1798         struct bas_cardstate *ucs = cs->hw.bas;
1799
1800         dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1801
1802         /* fake the missing signal - what else can I do? */
1803         update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1804         start_cbsend(cs);
1805 }
1806
1807 /* atwrite_submit
1808  * submit an HD_WRITE_ATMESSAGE command URB
1809  * parameters:
1810  *      cs      controller state structure
1811  *      buf     buffer containing command to send
1812  *      len     length of command to send
1813  * return value:
1814  *      0 on success
1815  *      -EBUSY if another request is pending
1816  *      any URB submission error code
1817  */
1818 static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1819 {
1820         struct bas_cardstate *ucs = cs->hw.bas;
1821         int rc;
1822
1823         gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1824
1825         if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1826                 dev_err(cs->dev,
1827                         "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1828                 return -EBUSY;
1829         }
1830
1831         ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1832         ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1833         ucs->dr_cmd_out.wValue = 0;
1834         ucs->dr_cmd_out.wIndex = 0;
1835         ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1836         usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1837                              usb_sndctrlpipe(ucs->udev, 0),
1838                              (unsigned char *) &ucs->dr_cmd_out, buf, len,
1839                              write_command_callback, cs);
1840         rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
1841         if (unlikely(rc)) {
1842                 update_basstate(ucs, 0, BS_ATWRPEND);
1843                 dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1844                         get_usb_rcmsg(rc));
1845                 return rc;
1846         }
1847
1848         /* submitted successfully, start timeout if necessary */
1849         if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1850                 gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
1851                         ATRDY_TIMEOUT);
1852                 ucs->timer_atrdy.expires = jiffies + ATRDY_TIMEOUT * HZ / 10;
1853                 ucs->timer_atrdy.data = (unsigned long) cs;
1854                 ucs->timer_atrdy.function = atrdy_timeout;
1855                 add_timer(&ucs->timer_atrdy);
1856         }
1857         return 0;
1858 }
1859
1860 /* start_cbsend
1861  * start transmission of AT command queue if necessary
1862  * parameter:
1863  *      cs              controller state structure
1864  * return value:
1865  *      0 on success
1866  *      error code < 0 on error
1867  */
1868 static int start_cbsend(struct cardstate *cs)
1869 {
1870         struct cmdbuf_t *cb;
1871         struct bas_cardstate *ucs = cs->hw.bas;
1872         unsigned long flags;
1873         int rc;
1874         int retval = 0;
1875
1876         /* check if suspend requested */
1877         if (ucs->basstate & BS_SUSPEND) {
1878                 gig_dbg(DEBUG_OUTPUT, "suspending");
1879                 return -EHOSTUNREACH;
1880         }
1881
1882         /* check if AT channel is open */
1883         if (!(ucs->basstate & BS_ATOPEN)) {
1884                 gig_dbg(DEBUG_OUTPUT, "AT channel not open");
1885                 rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1886                 if (rc < 0) {
1887                         /* flush command queue */
1888                         spin_lock_irqsave(&cs->cmdlock, flags);
1889                         while (cs->cmdbuf != NULL)
1890                                 complete_cb(cs);
1891                         spin_unlock_irqrestore(&cs->cmdlock, flags);
1892                 }
1893                 return rc;
1894         }
1895
1896         /* try to send first command in queue */
1897         spin_lock_irqsave(&cs->cmdlock, flags);
1898
1899         while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
1900                 ucs->retry_cmd_out = 0;
1901                 rc = atwrite_submit(cs, cb->buf, cb->len);
1902                 if (unlikely(rc)) {
1903                         retval = rc;
1904                         complete_cb(cs);
1905                 }
1906         }
1907
1908         spin_unlock_irqrestore(&cs->cmdlock, flags);
1909         return retval;
1910 }
1911
1912 /* gigaset_write_cmd
1913  * This function is called by the device independent part of the driver
1914  * to transmit an AT command string to the Gigaset device.
1915  * It encapsulates the device specific method for transmission over the
1916  * direct USB connection to the base.
1917  * The command string is added to the queue of commands to send, and
1918  * USB transmission is started if necessary.
1919  * parameters:
1920  *      cs              controller state structure
1921  *      buf             command string to send
1922  *      len             number of bytes to send (max. IF_WRITEBUF)
1923  *      wake_tasklet    tasklet to run when transmission is completed
1924  *                      (NULL if none)
1925  * return value:
1926  *      number of bytes queued on success
1927  *      error code < 0 on error
1928  */
1929 static int gigaset_write_cmd(struct cardstate *cs,
1930                              const unsigned char *buf, int len,
1931                              struct tasklet_struct *wake_tasklet)
1932 {
1933         struct cmdbuf_t *cb;
1934         unsigned long flags;
1935         int rc;
1936
1937         gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
1938                              DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1939                            "CMD Transmit", len, buf);
1940
1941         if (len <= 0) {
1942                 /* nothing to do */
1943                 rc = 0;
1944                 goto notqueued;
1945         }
1946
1947         /* translate "+++" escape sequence sent as a single separate command
1948          * into "close AT channel" command for error recovery
1949          * The next command will reopen the AT channel automatically.
1950          */
1951         if (len == 3 && !memcmp(buf, "+++", 3)) {
1952                 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
1953                 goto notqueued;
1954         }
1955
1956         if (len > IF_WRITEBUF)
1957                 len = IF_WRITEBUF;
1958         cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC);
1959         if (!cb) {
1960                 dev_err(cs->dev, "%s: out of memory\n", __func__);
1961                 rc = -ENOMEM;
1962                 goto notqueued;
1963         }
1964
1965         memcpy(cb->buf, buf, len);
1966         cb->len = len;
1967         cb->offset = 0;
1968         cb->next = NULL;
1969         cb->wake_tasklet = wake_tasklet;
1970
1971         spin_lock_irqsave(&cs->cmdlock, flags);
1972         cb->prev = cs->lastcmdbuf;
1973         if (cs->lastcmdbuf)
1974                 cs->lastcmdbuf->next = cb;
1975         else {
1976                 cs->cmdbuf = cb;
1977                 cs->curlen = len;
1978         }
1979         cs->cmdbytes += len;
1980         cs->lastcmdbuf = cb;
1981         spin_unlock_irqrestore(&cs->cmdlock, flags);
1982
1983         spin_lock_irqsave(&cs->lock, flags);
1984         if (unlikely(!cs->connected)) {
1985                 spin_unlock_irqrestore(&cs->lock, flags);
1986                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1987                 /* flush command queue */
1988                 spin_lock_irqsave(&cs->cmdlock, flags);
1989                 while (cs->cmdbuf != NULL)
1990                         complete_cb(cs);
1991                 spin_unlock_irqrestore(&cs->cmdlock, flags);
1992                 return -ENODEV;
1993         }
1994         rc = start_cbsend(cs);
1995         spin_unlock_irqrestore(&cs->lock, flags);
1996         return rc < 0 ? rc : len;
1997
1998 notqueued:                      /* request handled without queuing */
1999         if (wake_tasklet)
2000                 tasklet_schedule(wake_tasklet);
2001         return rc;
2002 }
2003
2004 /* gigaset_write_room
2005  * tty_driver.write_room interface routine
2006  * return number of characters the driver will accept to be written via
2007  * gigaset_write_cmd
2008  * parameter:
2009  *      controller state structure
2010  * return value:
2011  *      number of characters
2012  */
2013 static int gigaset_write_room(struct cardstate *cs)
2014 {
2015         return IF_WRITEBUF;
2016 }
2017
2018 /* gigaset_chars_in_buffer
2019  * tty_driver.chars_in_buffer interface routine
2020  * return number of characters waiting to be sent
2021  * parameter:
2022  *      controller state structure
2023  * return value:
2024  *      number of characters
2025  */
2026 static int gigaset_chars_in_buffer(struct cardstate *cs)
2027 {
2028         return cs->cmdbytes;
2029 }
2030
2031 /* gigaset_brkchars
2032  * implementation of ioctl(GIGASET_BRKCHARS)
2033  * parameter:
2034  *      controller state structure
2035  * return value:
2036  *      -EINVAL (unimplemented function)
2037  */
2038 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
2039 {
2040         return -EINVAL;
2041 }
2042
2043
2044 /* Device Initialization/Shutdown */
2045 /* ============================== */
2046
2047 /* Free hardware dependent part of the B channel structure
2048  * parameter:
2049  *      bcs     B channel structure
2050  * return value:
2051  *      !=0 on success
2052  */
2053 static int gigaset_freebcshw(struct bc_state *bcs)
2054 {
2055         struct bas_bc_state *ubc = bcs->hw.bas;
2056         int i;
2057
2058         if (!ubc)
2059                 return 0;
2060
2061         /* kill URBs and tasklets before freeing - better safe than sorry */
2062         ubc->running = 0;
2063         gig_dbg(DEBUG_INIT, "%s: killing iso URBs", __func__);
2064         for (i = 0; i < BAS_OUTURBS; ++i) {
2065                 usb_kill_urb(ubc->isoouturbs[i].urb);
2066                 usb_free_urb(ubc->isoouturbs[i].urb);
2067         }
2068         for (i = 0; i < BAS_INURBS; ++i) {
2069                 usb_kill_urb(ubc->isoinurbs[i]);
2070                 usb_free_urb(ubc->isoinurbs[i]);
2071         }
2072         tasklet_kill(&ubc->sent_tasklet);
2073         tasklet_kill(&ubc->rcvd_tasklet);
2074         kfree(ubc->isooutbuf);
2075         kfree(ubc);
2076         bcs->hw.bas = NULL;
2077         return 1;
2078 }
2079
2080 /* Initialize hardware dependent part of the B channel structure
2081  * parameter:
2082  *      bcs     B channel structure
2083  * return value:
2084  *      !=0 on success
2085  */
2086 static int gigaset_initbcshw(struct bc_state *bcs)
2087 {
2088         int i;
2089         struct bas_bc_state *ubc;
2090
2091         bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
2092         if (!ubc) {
2093                 pr_err("out of memory\n");
2094                 return 0;
2095         }
2096
2097         ubc->running = 0;
2098         atomic_set(&ubc->corrbytes, 0);
2099         spin_lock_init(&ubc->isooutlock);
2100         for (i = 0; i < BAS_OUTURBS; ++i) {
2101                 ubc->isoouturbs[i].urb = NULL;
2102                 ubc->isoouturbs[i].bcs = bcs;
2103         }
2104         ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
2105         ubc->numsub = 0;
2106         ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL);
2107         if (!ubc->isooutbuf) {
2108                 pr_err("out of memory\n");
2109                 kfree(ubc);
2110                 bcs->hw.bas = NULL;
2111                 return 0;
2112         }
2113         tasklet_init(&ubc->sent_tasklet,
2114                      write_iso_tasklet, (unsigned long) bcs);
2115
2116         spin_lock_init(&ubc->isoinlock);
2117         for (i = 0; i < BAS_INURBS; ++i)
2118                 ubc->isoinurbs[i] = NULL;
2119         ubc->isoindone = NULL;
2120         ubc->loststatus = -EINPROGRESS;
2121         ubc->isoinlost = 0;
2122         ubc->seqlen = 0;
2123         ubc->inbyte = 0;
2124         ubc->inbits = 0;
2125         ubc->goodbytes = 0;
2126         ubc->alignerrs = 0;
2127         ubc->fcserrs = 0;
2128         ubc->frameerrs = 0;
2129         ubc->giants = 0;
2130         ubc->runts = 0;
2131         ubc->aborts = 0;
2132         ubc->shared0s = 0;
2133         ubc->stolen0s = 0;
2134         tasklet_init(&ubc->rcvd_tasklet,
2135                      read_iso_tasklet, (unsigned long) bcs);
2136         return 1;
2137 }
2138
2139 static void gigaset_reinitbcshw(struct bc_state *bcs)
2140 {
2141         struct bas_bc_state *ubc = bcs->hw.bas;
2142
2143         bcs->hw.bas->running = 0;
2144         atomic_set(&bcs->hw.bas->corrbytes, 0);
2145         bcs->hw.bas->numsub = 0;
2146         spin_lock_init(&ubc->isooutlock);
2147         spin_lock_init(&ubc->isoinlock);
2148         ubc->loststatus = -EINPROGRESS;
2149 }
2150
2151 static void gigaset_freecshw(struct cardstate *cs)
2152 {
2153         /* timers, URBs and rcvbuf are disposed of in disconnect */
2154         kfree(cs->hw.bas->int_in_buf);
2155         kfree(cs->hw.bas);
2156         cs->hw.bas = NULL;
2157 }
2158
2159 static int gigaset_initcshw(struct cardstate *cs)
2160 {
2161         struct bas_cardstate *ucs;
2162
2163         cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
2164         if (!ucs) {
2165                 pr_err("out of memory\n");
2166                 return 0;
2167         }
2168         ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
2169         if (!ucs->int_in_buf) {
2170                 kfree(ucs);
2171                 pr_err("out of memory\n");
2172                 return 0;
2173         }
2174
2175         ucs->urb_cmd_in = NULL;
2176         ucs->urb_cmd_out = NULL;
2177         ucs->rcvbuf = NULL;
2178         ucs->rcvbuf_size = 0;
2179
2180         spin_lock_init(&ucs->lock);
2181         ucs->pending = 0;
2182
2183         ucs->basstate = 0;
2184         init_timer(&ucs->timer_ctrl);
2185         init_timer(&ucs->timer_atrdy);
2186         init_timer(&ucs->timer_cmd_in);
2187         init_waitqueue_head(&ucs->waitqueue);
2188
2189         return 1;
2190 }
2191
2192 /* freeurbs
2193  * unlink and deallocate all URBs unconditionally
2194  * caller must make sure that no commands are still in progress
2195  * parameter:
2196  *      cs      controller state structure
2197  */
2198 static void freeurbs(struct cardstate *cs)
2199 {
2200         struct bas_cardstate *ucs = cs->hw.bas;
2201         struct bas_bc_state *ubc;
2202         int i, j;
2203
2204         gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
2205         for (j = 0; j < BAS_CHANNELS; ++j) {
2206                 ubc = cs->bcs[j].hw.bas;
2207                 for (i = 0; i < BAS_OUTURBS; ++i) {
2208                         usb_kill_urb(ubc->isoouturbs[i].urb);
2209                         usb_free_urb(ubc->isoouturbs[i].urb);
2210                         ubc->isoouturbs[i].urb = NULL;
2211                 }
2212                 for (i = 0; i < BAS_INURBS; ++i) {
2213                         usb_kill_urb(ubc->isoinurbs[i]);
2214                         usb_free_urb(ubc->isoinurbs[i]);
2215                         ubc->isoinurbs[i] = NULL;
2216                 }
2217         }
2218         usb_kill_urb(ucs->urb_int_in);
2219         usb_free_urb(ucs->urb_int_in);
2220         ucs->urb_int_in = NULL;
2221         usb_kill_urb(ucs->urb_cmd_out);
2222         usb_free_urb(ucs->urb_cmd_out);
2223         ucs->urb_cmd_out = NULL;
2224         usb_kill_urb(ucs->urb_cmd_in);
2225         usb_free_urb(ucs->urb_cmd_in);
2226         ucs->urb_cmd_in = NULL;
2227         usb_kill_urb(ucs->urb_ctrl);
2228         usb_free_urb(ucs->urb_ctrl);
2229         ucs->urb_ctrl = NULL;
2230 }
2231
2232 /* gigaset_probe
2233  * This function is called when a new USB device is connected.
2234  * It checks whether the new device is handled by this driver.
2235  */
2236 static int gigaset_probe(struct usb_interface *interface,
2237                          const struct usb_device_id *id)
2238 {
2239         struct usb_host_interface *hostif;
2240         struct usb_device *udev = interface_to_usbdev(interface);
2241         struct cardstate *cs = NULL;
2242         struct bas_cardstate *ucs = NULL;
2243         struct bas_bc_state *ubc;
2244         struct usb_endpoint_descriptor *endpoint;
2245         int i, j;
2246         int rc;
2247
2248         gig_dbg(DEBUG_INIT,
2249                 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2250                 __func__, le16_to_cpu(udev->descriptor.idVendor),
2251                 le16_to_cpu(udev->descriptor.idProduct));
2252
2253         /* set required alternate setting */
2254         hostif = interface->cur_altsetting;
2255         if (hostif->desc.bAlternateSetting != 3) {
2256                 gig_dbg(DEBUG_INIT,
2257                         "%s: wrong alternate setting %d - trying to switch",
2258                         __func__, hostif->desc.bAlternateSetting);
2259                 if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3)
2260                     < 0) {
2261                         dev_warn(&udev->dev, "usb_set_interface failed, "
2262                                  "device %d interface %d altsetting %d\n",
2263                                  udev->devnum, hostif->desc.bInterfaceNumber,
2264                                  hostif->desc.bAlternateSetting);
2265                         return -ENODEV;
2266                 }
2267                 hostif = interface->cur_altsetting;
2268         }
2269
2270         /* Reject application specific interfaces
2271          */
2272         if (hostif->desc.bInterfaceClass != 255) {
2273                 dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
2274                          __func__, hostif->desc.bInterfaceClass);
2275                 return -ENODEV;
2276         }
2277
2278         dev_info(&udev->dev,
2279                  "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
2280                  __func__, le16_to_cpu(udev->descriptor.idVendor),
2281                  le16_to_cpu(udev->descriptor.idProduct));
2282
2283         /* allocate memory for our device state and intialize it */
2284         cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
2285                             GIGASET_MODULENAME);
2286         if (!cs)
2287                 return -ENODEV;
2288         ucs = cs->hw.bas;
2289
2290         /* save off device structure ptrs for later use */
2291         usb_get_dev(udev);
2292         ucs->udev = udev;
2293         ucs->interface = interface;
2294         cs->dev = &interface->dev;
2295
2296         /* allocate URBs:
2297          * - one for the interrupt pipe
2298          * - three for the different uses of the default control pipe
2299          * - three for each isochronous pipe
2300          */
2301         if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2302             !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2303             !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
2304             !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
2305                 goto allocerr;
2306
2307         for (j = 0; j < BAS_CHANNELS; ++j) {
2308                 ubc = cs->bcs[j].hw.bas;
2309                 for (i = 0; i < BAS_OUTURBS; ++i)
2310                         if (!(ubc->isoouturbs[i].urb =
2311                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2312                                 goto allocerr;
2313                 for (i = 0; i < BAS_INURBS; ++i)
2314                         if (!(ubc->isoinurbs[i] =
2315                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2316                                 goto allocerr;
2317         }
2318
2319         ucs->rcvbuf = NULL;
2320         ucs->rcvbuf_size = 0;
2321
2322         /* Fill the interrupt urb and send it to the core */
2323         endpoint = &hostif->endpoint[0].desc;
2324         usb_fill_int_urb(ucs->urb_int_in, udev,
2325                          usb_rcvintpipe(udev,
2326                                         (endpoint->bEndpointAddress) & 0x0f),
2327                          ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
2328                          endpoint->bInterval);
2329         rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2330         if (rc != 0) {
2331                 dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2332                         get_usb_rcmsg(rc));
2333                 goto error;
2334         }
2335
2336         /* tell the device that the driver is ready */
2337         rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0);
2338         if (rc != 0)
2339                 goto error;
2340
2341         /* tell common part that the device is ready */
2342         if (startmode == SM_LOCKED)
2343                 cs->mstate = MS_LOCKED;
2344
2345         /* save address of controller structure */
2346         usb_set_intfdata(interface, cs);
2347
2348         if (!gigaset_start(cs))
2349                 goto error;
2350
2351         return 0;
2352
2353 allocerr:
2354         dev_err(cs->dev, "could not allocate URBs\n");
2355 error:
2356         freeurbs(cs);
2357         usb_set_intfdata(interface, NULL);
2358         gigaset_freecs(cs);
2359         return -ENODEV;
2360 }
2361
2362 /* gigaset_disconnect
2363  * This function is called when the Gigaset base is unplugged.
2364  */
2365 static void gigaset_disconnect(struct usb_interface *interface)
2366 {
2367         struct cardstate *cs;
2368         struct bas_cardstate *ucs;
2369         int j;
2370
2371         cs = usb_get_intfdata(interface);
2372
2373         ucs = cs->hw.bas;
2374
2375         dev_info(cs->dev, "disconnecting Gigaset base\n");
2376
2377         /* mark base as not ready, all channels disconnected */
2378         ucs->basstate = 0;
2379
2380         /* tell LL all channels are down */
2381         for (j = 0; j < BAS_CHANNELS; ++j)
2382                 gigaset_bchannel_down(cs->bcs + j);
2383
2384         /* stop driver (common part) */
2385         gigaset_stop(cs);
2386
2387         /* stop timers and URBs, free ressources */
2388         del_timer_sync(&ucs->timer_ctrl);
2389         del_timer_sync(&ucs->timer_atrdy);
2390         del_timer_sync(&ucs->timer_cmd_in);
2391         freeurbs(cs);
2392         usb_set_intfdata(interface, NULL);
2393         kfree(ucs->rcvbuf);
2394         ucs->rcvbuf = NULL;
2395         ucs->rcvbuf_size = 0;
2396         usb_put_dev(ucs->udev);
2397         ucs->interface = NULL;
2398         ucs->udev = NULL;
2399         cs->dev = NULL;
2400         gigaset_freecs(cs);
2401 }
2402
2403 /* gigaset_suspend
2404  * This function is called before the USB connection is suspended.
2405  */
2406 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
2407 {
2408         struct cardstate *cs = usb_get_intfdata(intf);
2409         struct bas_cardstate *ucs = cs->hw.bas;
2410         int rc;
2411
2412         /* set suspend flag; this stops AT command/response traffic */
2413         if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
2414                 gig_dbg(DEBUG_SUSPEND, "already suspended");
2415                 return 0;
2416         }
2417
2418         /* wait a bit for blocking conditions to go away */
2419         rc = wait_event_timeout(ucs->waitqueue,
2420                         !(ucs->basstate &
2421                           (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)),
2422                         BAS_TIMEOUT*HZ/10);
2423         gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
2424
2425         /* check for conditions preventing suspend */
2426         if (ucs->basstate & (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)) {
2427                 dev_warn(cs->dev, "cannot suspend:\n");
2428                 if (ucs->basstate & BS_B1OPEN)
2429                         dev_warn(cs->dev, " B channel 1 open\n");
2430                 if (ucs->basstate & BS_B2OPEN)
2431                         dev_warn(cs->dev, " B channel 2 open\n");
2432                 if (ucs->basstate & BS_ATRDPEND)
2433                         dev_warn(cs->dev, " receiving AT reply\n");
2434                 if (ucs->basstate & BS_ATWRPEND)
2435                         dev_warn(cs->dev, " sending AT command\n");
2436                 update_basstate(ucs, 0, BS_SUSPEND);
2437                 return -EBUSY;
2438         }
2439
2440         /* close AT channel if open */
2441         if (ucs->basstate & BS_ATOPEN) {
2442                 gig_dbg(DEBUG_SUSPEND, "closing AT channel");
2443                 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
2444                 if (rc) {
2445                         update_basstate(ucs, 0, BS_SUSPEND);
2446                         return rc;
2447                 }
2448                 wait_event_timeout(ucs->waitqueue, !ucs->pending,
2449                                    BAS_TIMEOUT*HZ/10);
2450                 /* in case of timeout, proceed anyway */
2451         }
2452
2453         /* kill all URBs and timers that might still be pending */
2454         usb_kill_urb(ucs->urb_ctrl);
2455         usb_kill_urb(ucs->urb_int_in);
2456         del_timer_sync(&ucs->timer_ctrl);
2457
2458         gig_dbg(DEBUG_SUSPEND, "suspend complete");
2459         return 0;
2460 }
2461
2462 /* gigaset_resume
2463  * This function is called after the USB connection has been resumed.
2464  */
2465 static int gigaset_resume(struct usb_interface *intf)
2466 {
2467         struct cardstate *cs = usb_get_intfdata(intf);
2468         struct bas_cardstate *ucs = cs->hw.bas;
2469         int rc;
2470
2471         /* resubmit interrupt URB for spontaneous messages from base */
2472         rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2473         if (rc) {
2474                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
2475                         get_usb_rcmsg(rc));
2476                 return rc;
2477         }
2478
2479         /* clear suspend flag to reallow activity */
2480         update_basstate(ucs, 0, BS_SUSPEND);
2481
2482         gig_dbg(DEBUG_SUSPEND, "resume complete");
2483         return 0;
2484 }
2485
2486 /* gigaset_pre_reset
2487  * This function is called before the USB connection is reset.
2488  */
2489 static int gigaset_pre_reset(struct usb_interface *intf)
2490 {
2491         /* handle just like suspend */
2492         return gigaset_suspend(intf, PMSG_ON);
2493 }
2494
2495 /* gigaset_post_reset
2496  * This function is called after the USB connection has been reset.
2497  */
2498 static int gigaset_post_reset(struct usb_interface *intf)
2499 {
2500         /* FIXME: send HD_DEVICE_INIT_ACK? */
2501
2502         /* resume operations */
2503         return gigaset_resume(intf);
2504 }
2505
2506
2507 static const struct gigaset_ops gigops = {
2508         gigaset_write_cmd,
2509         gigaset_write_room,
2510         gigaset_chars_in_buffer,
2511         gigaset_brkchars,
2512         gigaset_init_bchannel,
2513         gigaset_close_bchannel,
2514         gigaset_initbcshw,
2515         gigaset_freebcshw,
2516         gigaset_reinitbcshw,
2517         gigaset_initcshw,
2518         gigaset_freecshw,
2519         gigaset_set_modem_ctrl,
2520         gigaset_baud_rate,
2521         gigaset_set_line_ctrl,
2522         gigaset_isoc_send_skb,
2523         gigaset_isoc_input,
2524 };
2525
2526 /* bas_gigaset_init
2527  * This function is called after the kernel module is loaded.
2528  */
2529 static int __init bas_gigaset_init(void)
2530 {
2531         int result;
2532
2533         /* allocate memory for our driver state and intialize it */
2534         driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2535                                     GIGASET_MODULENAME, GIGASET_DEVNAME,
2536                                     &gigops, THIS_MODULE);
2537         if (driver == NULL)
2538                 goto error;
2539
2540         /* register this driver with the USB subsystem */
2541         result = usb_register(&gigaset_usb_driver);
2542         if (result < 0) {
2543                 pr_err("error %d registering USB driver\n", -result);
2544                 goto error;
2545         }
2546
2547         pr_info(DRIVER_DESC "\n");
2548         return 0;
2549
2550 error:
2551         if (driver)
2552                 gigaset_freedriver(driver);
2553         driver = NULL;
2554         return -1;
2555 }
2556
2557 /* bas_gigaset_exit
2558  * This function is called before the kernel module is unloaded.
2559  */
2560 static void __exit bas_gigaset_exit(void)
2561 {
2562         struct bas_cardstate *ucs;
2563         int i;
2564
2565         gigaset_blockdriver(driver); /* => probe will fail
2566                                       * => no gigaset_start any more
2567                                       */
2568
2569         /* stop all connected devices */
2570         for (i = 0; i < driver->minors; i++) {
2571                 if (gigaset_shutdown(driver->cs + i) < 0)
2572                         continue;               /* no device */
2573                 /* from now on, no isdn callback should be possible */
2574
2575                 /* close all still open channels */
2576                 ucs = driver->cs[i].hw.bas;
2577                 if (ucs->basstate & BS_B1OPEN) {
2578                         gig_dbg(DEBUG_INIT, "closing B1 channel");
2579                         usb_control_msg(ucs->udev,
2580                                         usb_sndctrlpipe(ucs->udev, 0),
2581                                         HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
2582                                         0, 0, NULL, 0, BAS_TIMEOUT);
2583                 }
2584                 if (ucs->basstate & BS_B2OPEN) {
2585                         gig_dbg(DEBUG_INIT, "closing B2 channel");
2586                         usb_control_msg(ucs->udev,
2587                                         usb_sndctrlpipe(ucs->udev, 0),
2588                                         HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
2589                                         0, 0, NULL, 0, BAS_TIMEOUT);
2590                 }
2591                 if (ucs->basstate & BS_ATOPEN) {
2592                         gig_dbg(DEBUG_INIT, "closing AT channel");
2593                         usb_control_msg(ucs->udev,
2594                                         usb_sndctrlpipe(ucs->udev, 0),
2595                                         HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
2596                                         0, 0, NULL, 0, BAS_TIMEOUT);
2597                 }
2598                 ucs->basstate = 0;
2599         }
2600
2601         /* deregister this driver with the USB subsystem */
2602         usb_deregister(&gigaset_usb_driver);
2603         /* this will call the disconnect-callback */
2604         /* from now on, no disconnect/probe callback should be running */
2605
2606         gigaset_freedriver(driver);
2607         driver = NULL;
2608 }
2609
2610
2611 module_init(bas_gigaset_init);
2612 module_exit(bas_gigaset_exit);
2613
2614 MODULE_AUTHOR(DRIVER_AUTHOR);
2615 MODULE_DESCRIPTION(DRIVER_DESC);
2616 MODULE_LICENSE("GPL");