drivers/isdn/gigaset/bas-gigaset.c

   1 /*
   2  * USB driver for Gigaset 307x base via direct USB connection.
   3  *
   4  * Copyright (c) 2001 by Hansjoerg Lipp <hjlipp@web.de>,
   5  *                       Tilman Schmidt <tilman@imap.cc>,
   6  *                       Stefan Eilers.
   7  *
   8  * =====================================================================
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License as
  11  *      published by the Free Software Foundation; either version 2 of
  12  *      the License, or (at your option) any later version.
  13  * =====================================================================
  14  */
  15
  16 #include "gigaset.h"
  17
  18 #include <linux/errno.h>
  19 #include <linux/init.h>
  20 #include <linux/slab.h>
  21 #include <linux/timer.h>
  22 #include <linux/usb.h>
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25
  26 /* Version Information */
  27 #define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
  28 #define DRIVER_DESC "USB Driver for Gigaset 307x"
  29
  30
  31 /* Module parameters */
  32
  33 static int startmode = SM_ISDN;
  34 static int cidmode = 1;
  35
  36 module_param(startmode, int, S_IRUGO);
  37 module_param(cidmode, int, S_IRUGO);
  38 MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
  39 MODULE_PARM_DESC(cidmode, "Call-ID mode");
  40
  41 #define GIGASET_MINORS     1
  42 #define GIGASET_MINOR      16
  43 #define GIGASET_MODULENAME "bas_gigaset"
  44 #define GIGASET_DEVNAME    "ttyGB"
  45
  46 /* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
  47 #define IF_WRITEBUF 264
  48
  49 /* interrupt pipe message size according to ibid. ch. 2.2 */
  50 #define IP_MSGSIZE 3
  51
  52 /* Values for the Gigaset 307x */
  53 #define USB_GIGA_VENDOR_ID      0x0681
  54 #define USB_3070_PRODUCT_ID     0x0001
  55 #define USB_3075_PRODUCT_ID     0x0002
  56 #define USB_SX303_PRODUCT_ID    0x0021
  57 #define USB_SX353_PRODUCT_ID    0x0022
  58
  59 /* table of devices that work with this driver */
  60 static const struct usb_device_id gigaset_table[] = {
  61         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3070_PRODUCT_ID) },
  62         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3075_PRODUCT_ID) },
  63         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX303_PRODUCT_ID) },
  64         { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX353_PRODUCT_ID) },
  65         { } /* Terminating entry */
  66 };
  67
  68 MODULE_DEVICE_TABLE(usb, gigaset_table);
  69
  70 /*======================= local function prototypes ==========================*/
  71
  72 /* function called if a new device belonging to this driver is connected */
  73 static int gigaset_probe(struct usb_interface *interface,
  74                          const struct usb_device_id *id);
  75
  76 /* Function will be called if the device is unplugged */
  77 static void gigaset_disconnect(struct usb_interface *interface);
  78
  79 /* functions called before/after suspend */
  80 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
  81 static int gigaset_resume(struct usb_interface *intf);
  82
  83 /* functions called before/after device reset */
  84 static int gigaset_pre_reset(struct usb_interface *intf);
  85 static int gigaset_post_reset(struct usb_interface *intf);
  86
  87 static int atread_submit(struct cardstate *, int);
  88 static void stopurbs(struct bas_bc_state *);
  89 static int req_submit(struct bc_state *, int, int, int);
  90 static int atwrite_submit(struct cardstate *, unsigned char *, int);
  91 static int start_cbsend(struct cardstate *);
  92
  93 /*============================================================================*/
  94
  95 struct bas_cardstate {
  96         struct usb_device       *udev;          /* USB device pointer */
  97         struct usb_interface    *interface;     /* interface for this device */
  98         unsigned char           minor;          /* starting minor number */
  99
 100         struct urb              *urb_ctrl;      /* control pipe default URB */
 101         struct usb_ctrlrequest  dr_ctrl;
 102         struct timer_list       timer_ctrl;     /* control request timeout */
 103         int                     retry_ctrl;
 104
 105         struct timer_list       timer_atrdy;    /* AT command ready timeout */
 106         struct urb              *urb_cmd_out;   /* for sending AT commands */
 107         struct usb_ctrlrequest  dr_cmd_out;
 108         int                     retry_cmd_out;
 109
 110         struct urb              *urb_cmd_in;    /* for receiving AT replies */
 111         struct usb_ctrlrequest  dr_cmd_in;
 112         struct timer_list       timer_cmd_in;   /* receive request timeout */
 113         unsigned char           *rcvbuf;        /* AT reply receive buffer */
 114
 115         struct urb              *urb_int_in;    /* URB for interrupt pipe */
 116         unsigned char           *int_in_buf;
 117
 118         spinlock_t              lock;           /* locks all following */
 119         int                     basstate;       /* bitmap (BS_*) */
 120         int                     pending;        /* uncompleted base request */
 121         wait_queue_head_t       waitqueue;
 122         int                     rcvbuf_size;    /* size of AT receive buffer */
 123                                                 /* 0: no receive in progress */
 124         int                     retry_cmd_in;   /* receive req retry count */
 125 };
 126
 127 /* status of direct USB connection to 307x base (bits in basstate) */
 128 #define BS_ATOPEN       0x001   /* AT channel open */
 129 #define BS_B1OPEN       0x002   /* B channel 1 open */
 130 #define BS_B2OPEN       0x004   /* B channel 2 open */
 131 #define BS_ATREADY      0x008   /* base ready for AT command */
 132 #define BS_INIT         0x010   /* base has signalled INIT_OK */
 133 #define BS_ATTIMER      0x020   /* waiting for HD_READY_SEND_ATDATA */
 134 #define BS_ATRDPEND     0x040   /* urb_cmd_in in use */
 135 #define BS_ATWRPEND     0x080   /* urb_cmd_out in use */
 136 #define BS_SUSPEND      0x100   /* USB port suspended */
 137 #define BS_RESETTING    0x200   /* waiting for HD_RESET_INTERRUPT_PIPE_ACK */
 138
 139
 140 static struct gigaset_driver *driver;
 141
 142 /* usb specific object needed to register this driver with the usb subsystem */
 143 static struct usb_driver gigaset_usb_driver = {
 144         .name =         GIGASET_MODULENAME,
 145         .probe =        gigaset_probe,
 146         .disconnect =   gigaset_disconnect,
 147         .id_table =     gigaset_table,
 148         .suspend =      gigaset_suspend,
 149         .resume =       gigaset_resume,
 150         .reset_resume = gigaset_post_reset,
 151         .pre_reset =    gigaset_pre_reset,
 152         .post_reset =   gigaset_post_reset,
 153 };
 154
 155 /* get message text for usb_submit_urb return code
 156  */
 157 static char *get_usb_rcmsg(int rc)
 158 {
 159         static char unkmsg[28];
 160
 161         switch (rc) {
 162         case 0:
 163                 return "success";
 164         case -ENOMEM:
 165                 return "out of memory";
 166         case -ENODEV:
 167                 return "device not present";
 168         case -ENOENT:
 169                 return "endpoint not present";
 170         case -ENXIO:
 171                 return "URB type not supported";
 172         case -EINVAL:
 173                 return "invalid argument";
 174         case -EAGAIN:
 175                 return "start frame too early or too much scheduled";
 176         case -EFBIG:
 177                 return "too many isochronous frames requested";
 178         case -EPIPE:
 179                 return "endpoint stalled";
 180         case -EMSGSIZE:
 181                 return "invalid packet size";
 182         case -ENOSPC:
 183                 return "would overcommit USB bandwidth";
 184         case -ESHUTDOWN:
 185                 return "device shut down";
 186         case -EPERM:
 187                 return "reject flag set";
 188         case -EHOSTUNREACH:
 189                 return "device suspended";
 190         default:
 191                 snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
 192                 return unkmsg;
 193         }
 194 }
 195
 196 /* get message text for USB status code
 197  */
 198 static char *get_usb_statmsg(int status)
 199 {
 200         static char unkmsg[28];
 201
 202         switch (status) {
 203         case 0:
 204                 return "success";
 205         case -ENOENT:
 206                 return "unlinked (sync)";
 207         case -EINPROGRESS:
 208                 return "pending";
 209         case -EPROTO:
 210                 return "bit stuffing error, timeout, or unknown USB error";
 211         case -EILSEQ:
 212                 return "CRC mismatch, timeout, or unknown USB error";
 213         case -ETIME:
 214                 return "timed out";
 215         case -EPIPE:
 216                 return "endpoint stalled";
 217         case -ECOMM:
 218                 return "IN buffer overrun";
 219         case -ENOSR:
 220                 return "OUT buffer underrun";
 221         case -EOVERFLOW:
 222                 return "too much data";
 223         case -EREMOTEIO:
 224                 return "short packet detected";
 225         case -ENODEV:
 226                 return "device removed";
 227         case -EXDEV:
 228                 return "partial isochronous transfer";
 229         case -EINVAL:
 230                 return "invalid argument";
 231         case -ECONNRESET:
 232                 return "unlinked (async)";
 233         case -ESHUTDOWN:
 234                 return "device shut down";
 235         default:
 236                 snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
 237                 return unkmsg;
 238         }
 239 }
 240
 241 /* usb_pipetype_str
 242  * retrieve string representation of USB pipe type
 243  */
 244 static inline char *usb_pipetype_str(int pipe)
 245 {
 246         if (usb_pipeisoc(pipe))
 247                 return "Isoc";
 248         if (usb_pipeint(pipe))
 249                 return "Int";
 250         if (usb_pipecontrol(pipe))
 251                 return "Ctrl";
 252         if (usb_pipebulk(pipe))
 253                 return "Bulk";
 254         return "?";
 255 }
 256
 257 /* dump_urb
 258  * write content of URB to syslog for debugging
 259  */
 260 static inline void dump_urb(enum debuglevel level, const char *tag,
 261                             struct urb *urb)
 262 {
 263 #ifdef CONFIG_GIGASET_DEBUG
 264         int i;
 265         gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
 266         if (urb) {
 267                 gig_dbg(level,
 268                         "  dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
 269                         "hcpriv=0x%08lx, transfer_flags=0x%x,",
 270                         (unsigned long) urb->dev,
 271                         usb_pipetype_str(urb->pipe),
 272                         usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
 273                         usb_pipein(urb->pipe) ? "in" : "out",
 274                         (unsigned long) urb->hcpriv,
 275                         urb->transfer_flags);
 276                 gig_dbg(level,
 277                         "  transfer_buffer=0x%08lx[%d], actual_length=%d, "
 278                         "setup_packet=0x%08lx,",
 279                         (unsigned long) urb->transfer_buffer,
 280                         urb->transfer_buffer_length, urb->actual_length,
 281                         (unsigned long) urb->setup_packet);
 282                 gig_dbg(level,
 283                         "  start_frame=%d, number_of_packets=%d, interval=%d, "
 284                         "error_count=%d,",
 285                         urb->start_frame, urb->number_of_packets, urb->interval,
 286                         urb->error_count);
 287                 gig_dbg(level,
 288                         "  context=0x%08lx, complete=0x%08lx, "
 289                         "iso_frame_desc[]={",
 290                         (unsigned long) urb->context,
 291                         (unsigned long) urb->complete);
 292                 for (i = 0; i < urb->number_of_packets; i++) {
 293                         struct usb_iso_packet_descriptor *pifd
 294                                 = &urb->iso_frame_desc[i];
 295                         gig_dbg(level,
 296                                 "    {offset=%u, length=%u, actual_length=%u, "
 297                                 "status=%u}",
 298                                 pifd->offset, pifd->length, pifd->actual_length,
 299                                 pifd->status);
 300                 }
 301         }
 302         gig_dbg(level, "}}");
 303 #endif
 304 }
 305
 306 /* read/set modem control bits etc. (m10x only) */
 307 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
 308                                   unsigned new_state)
 309 {
 310         return -EINVAL;
 311 }
 312
 313 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
 314 {
 315         return -EINVAL;
 316 }
 317
 318 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
 319 {
 320         return -EINVAL;
 321 }
 322
 323 /* set/clear bits in base connection state, return previous state
 324  */
 325 static inline int update_basstate(struct bas_cardstate *ucs,
 326                                   int set, int clear)
 327 {
 328         unsigned long flags;
 329         int state;
 330
 331         spin_lock_irqsave(&ucs->lock, flags);
 332         state = ucs->basstate;
 333         ucs->basstate = (state & ~clear) | set;
 334         spin_unlock_irqrestore(&ucs->lock, flags);
 335         return state;
 336 }
 337
 338 /* error_hangup
 339  * hang up any existing connection because of an unrecoverable error
 340  * This function may be called from any context and takes care of scheduling
 341  * the necessary actions for execution outside of interrupt context.
 342  * cs->lock must not be held.
 343  * argument:
 344  *      B channel control structure
 345  */
 346 static inline void error_hangup(struct bc_state *bcs)
 347 {
 348         struct cardstate *cs = bcs->cs;
 349
 350         gig_dbg(DEBUG_ANY, "%s: scheduling HUP for channel %d",
 351                 __func__, bcs->channel);
 352
 353         if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL))
 354                 dev_err(cs->dev, "event queue full\n");
 355
 356         gigaset_schedule_event(cs);
 357 }
 358
 359 /* error_reset
 360  * reset Gigaset device because of an unrecoverable error
 361  * This function may be called from any context, and takes care of
 362  * scheduling the necessary actions for execution outside of interrupt context.
 363  * cs->lock must not be held.
 364  * argument:
 365  *      controller state structure
 366  */
 367 static inline void error_reset(struct cardstate *cs)
 368 {
 369         /* reset interrupt pipe to recover (ignore errors) */
 370         update_basstate(cs->hw.bas, BS_RESETTING, 0);
 371         req_submit(cs->bcs, HD_RESET_INTERRUPT_PIPE, 0, BAS_TIMEOUT);
 372 }
 373
 374 /* check_pending
 375  * check for completion of pending control request
 376  * parameter:
 377  *      ucs     hardware specific controller state structure
 378  */
 379 static void check_pending(struct bas_cardstate *ucs)
 380 {
 381         unsigned long flags;
 382
 383         spin_lock_irqsave(&ucs->lock, flags);
 384         switch (ucs->pending) {
 385         case 0:
 386                 break;
 387         case HD_OPEN_ATCHANNEL:
 388                 if (ucs->basstate & BS_ATOPEN)
 389                         ucs->pending = 0;
 390                 break;
 391         case HD_OPEN_B1CHANNEL:
 392                 if (ucs->basstate & BS_B1OPEN)
 393                         ucs->pending = 0;
 394                 break;
 395         case HD_OPEN_B2CHANNEL:
 396                 if (ucs->basstate & BS_B2OPEN)
 397                         ucs->pending = 0;
 398                 break;
 399         case HD_CLOSE_ATCHANNEL:
 400                 if (!(ucs->basstate & BS_ATOPEN))
 401                         ucs->pending = 0;
 402                 break;
 403         case HD_CLOSE_B1CHANNEL:
 404                 if (!(ucs->basstate & BS_B1OPEN))
 405                         ucs->pending = 0;
 406                 break;
 407         case HD_CLOSE_B2CHANNEL:
 408                 if (!(ucs->basstate & BS_B2OPEN))
 409                         ucs->pending = 0;
 410                 break;
 411         case HD_DEVICE_INIT_ACK:                /* no reply expected */
 412                 ucs->pending = 0;
 413                 break;
 414         case HD_RESET_INTERRUPT_PIPE:
 415                 if (!(ucs->basstate & BS_RESETTING))
 416                         ucs->pending = 0;
 417                 break;
 418         /*
 419          * HD_READ_ATMESSAGE and HD_WRITE_ATMESSAGE are handled separately
 420          * and should never end up here
 421          */
 422         default:
 423                 dev_warn(&ucs->interface->dev,
 424                          "unknown pending request 0x%02x cleared\n",
 425                          ucs->pending);
 426                 ucs->pending = 0;
 427         }
 428
 429         if (!ucs->pending)
 430                 del_timer(&ucs->timer_ctrl);
 431
 432         spin_unlock_irqrestore(&ucs->lock, flags);
 433 }
 434
 435 /* cmd_in_timeout
 436  * timeout routine for command input request
 437  * argument:
 438  *      controller state structure
 439  */
 440 static void cmd_in_timeout(unsigned long data)
 441 {
 442         struct cardstate *cs = (struct cardstate *) data;
 443         struct bas_cardstate *ucs = cs->hw.bas;
 444         int rc;
 445
 446         if (!ucs->rcvbuf_size) {
 447                 gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
 448                 return;
 449         }
 450
 451         if (ucs->retry_cmd_in++ < BAS_RETRY) {
 452                 dev_notice(cs->dev, "control read: timeout, retry %d\n",
 453                            ucs->retry_cmd_in);
 454                 rc = atread_submit(cs, BAS_TIMEOUT);
 455                 if (rc >= 0 || rc == -ENODEV)
 456                         /* resubmitted or disconnected */
 457                         /* - bypass regular exit block */
 458                         return;
 459         } else {
 460                 dev_err(cs->dev,
 461                         "control read: timeout, giving up after %d tries\n",
 462                         ucs->retry_cmd_in);
 463         }
 464         kfree(ucs->rcvbuf);
 465         ucs->rcvbuf = NULL;
 466         ucs->rcvbuf_size = 0;
 467         error_reset(cs);
 468 }
 469
 470 /* read_ctrl_callback
 471  * USB completion handler for control pipe input
 472  * called by the USB subsystem in interrupt context
 473  * parameter:
 474  *      urb     USB request block
 475  *              urb->context = inbuf structure for controller state
 476  */
 477 static void read_ctrl_callback(struct urb *urb)
 478 {
 479         struct inbuf_t *inbuf = urb->context;
 480         struct cardstate *cs = inbuf->cs;
 481         struct bas_cardstate *ucs = cs->hw.bas;
 482         int status = urb->status;
 483         int have_data = 0;
 484         unsigned numbytes;
 485         int rc;
 486
 487         update_basstate(ucs, 0, BS_ATRDPEND);
 488         wake_up(&ucs->waitqueue);
 489
 490         if (!ucs->rcvbuf_size) {
 491                 dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
 492                 return;
 493         }
 494
 495         del_timer(&ucs->timer_cmd_in);
 496
 497         switch (status) {
 498         case 0:                         /* normal completion */
 499                 numbytes = urb->actual_length;
 500                 if (unlikely(numbytes != ucs->rcvbuf_size)) {
 501                         dev_warn(cs->dev,
 502                                "control read: received %d chars, expected %d\n",
 503                                  numbytes, ucs->rcvbuf_size);
 504                         if (numbytes > ucs->rcvbuf_size)
 505                                 numbytes = ucs->rcvbuf_size;
 506                 }
 507
 508                 /* copy received bytes to inbuf */
 509                 have_data = gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes);
 510
 511                 if (unlikely(numbytes < ucs->rcvbuf_size)) {
 512                         /* incomplete - resubmit for remaining bytes */
 513                         ucs->rcvbuf_size -= numbytes;
 514                         ucs->retry_cmd_in = 0;
 515                         rc = atread_submit(cs, BAS_TIMEOUT);
 516                         if (rc >= 0 || rc == -ENODEV)
 517                                 /* resubmitted or disconnected */
 518                                 /* - bypass regular exit block */
 519                                 return;
 520                         error_reset(cs);
 521                 }
 522                 break;
 523
 524         case -ENOENT:                   /* cancelled */
 525         case -ECONNRESET:               /* cancelled (async) */
 526         case -EINPROGRESS:              /* pending */
 527         case -ENODEV:                   /* device removed */
 528         case -ESHUTDOWN:                /* device shut down */
 529                 /* no action necessary */
 530                 gig_dbg(DEBUG_USBREQ, "%s: %s",
 531                         __func__, get_usb_statmsg(status));
 532                 break;
 533
 534         default:                        /* severe trouble */
 535                 dev_warn(cs->dev, "control read: %s\n",
 536                          get_usb_statmsg(status));
 537                 if (ucs->retry_cmd_in++ < BAS_RETRY) {
 538                         dev_notice(cs->dev, "control read: retry %d\n",
 539                                    ucs->retry_cmd_in);
 540                         rc = atread_submit(cs, BAS_TIMEOUT);
 541                         if (rc >= 0 || rc == -ENODEV)
 542                                 /* resubmitted or disconnected */
 543                                 /* - bypass regular exit block */
 544                                 return;
 545                 } else {
 546                         dev_err(cs->dev,
 547                                 "control read: giving up after %d tries\n",
 548                                 ucs->retry_cmd_in);
 549                 }
 550                 error_reset(cs);
 551         }
 552
 553         kfree(ucs->rcvbuf);
 554         ucs->rcvbuf = NULL;
 555         ucs->rcvbuf_size = 0;
 556         if (have_data) {
 557                 gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
 558                 gigaset_schedule_event(cs);
 559         }
 560 }
 561
 562 /* atread_submit
 563  * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
 564  * parameters:
 565  *      cs      controller state structure
 566  *      timeout timeout in 1/10 sec., 0: none
 567  * return value:
 568  *      0 on success
 569  *      -EBUSY if another request is pending
 570  *      any URB submission error code
 571  */
 572 static int atread_submit(struct cardstate *cs, int timeout)
 573 {
 574         struct bas_cardstate *ucs = cs->hw.bas;
 575         int basstate;
 576         int ret;
 577
 578         gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
 579                 ucs->rcvbuf_size);
 580
 581         basstate = update_basstate(ucs, BS_ATRDPEND, 0);
 582         if (basstate & BS_ATRDPEND) {
 583                 dev_err(cs->dev,
 584                         "could not submit HD_READ_ATMESSAGE: URB busy\n");
 585                 return -EBUSY;
 586         }
 587
 588         if (basstate & BS_SUSPEND) {
 589                 dev_notice(cs->dev,
 590                            "HD_READ_ATMESSAGE not submitted, "
 591                            "suspend in progress\n");
 592                 update_basstate(ucs, 0, BS_ATRDPEND);
 593                 /* treat like disconnect */
 594                 return -ENODEV;
 595         }
 596
 597         ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
 598         ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
 599         ucs->dr_cmd_in.wValue = 0;
 600         ucs->dr_cmd_in.wIndex = 0;
 601         ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
 602         usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
 603                              usb_rcvctrlpipe(ucs->udev, 0),
 604                              (unsigned char *) &ucs->dr_cmd_in,
 605                              ucs->rcvbuf, ucs->rcvbuf_size,
 606                              read_ctrl_callback, cs->inbuf);
 607
 608         ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC);
 609         if (ret != 0) {
 610                 update_basstate(ucs, 0, BS_ATRDPEND);
 611                 dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
 612                         get_usb_rcmsg(ret));
 613                 return ret;
 614         }
 615
 616         if (timeout > 0) {
 617                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
 618                 ucs->timer_cmd_in.expires = jiffies + timeout * HZ / 10;
 619                 ucs->timer_cmd_in.data = (unsigned long) cs;
 620                 ucs->timer_cmd_in.function = cmd_in_timeout;
 621                 add_timer(&ucs->timer_cmd_in);
 622         }
 623         return 0;
 624 }
 625
 626 /* read_int_callback
 627  * USB completion handler for interrupt pipe input
 628  * called by the USB subsystem in interrupt context
 629  * parameter:
 630  *      urb     USB request block
 631  *              urb->context = controller state structure
 632  */
 633 static void read_int_callback(struct urb *urb)
 634 {
 635         struct cardstate *cs = urb->context;
 636         struct bas_cardstate *ucs = cs->hw.bas;
 637         struct bc_state *bcs;
 638         int status = urb->status;
 639         unsigned long flags;
 640         int rc;
 641         unsigned l;
 642         int channel;
 643
 644         switch (status) {
 645         case 0:                 /* success */
 646                 break;
 647         case -ENOENT:                   /* cancelled */
 648         case -ECONNRESET:               /* cancelled (async) */
 649         case -EINPROGRESS:              /* pending */
 650                 /* ignore silently */
 651                 gig_dbg(DEBUG_USBREQ, "%s: %s",
 652                         __func__, get_usb_statmsg(status));
 653                 return;
 654         case -ENODEV:                   /* device removed */
 655         case -ESHUTDOWN:                /* device shut down */
 656                 gig_dbg(DEBUG_USBREQ, "%s: device disconnected", __func__);
 657                 return;
 658         default:                /* severe trouble */
 659                 dev_warn(cs->dev, "interrupt read: %s\n",
 660                          get_usb_statmsg(status));
 661                 goto resubmit;
 662         }
 663
 664         /* drop incomplete packets even if the missing bytes wouldn't matter */
 665         if (unlikely(urb->actual_length < IP_MSGSIZE)) {
 666                 dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
 667                          urb->actual_length);
 668                 goto resubmit;
 669         }
 670
 671         l = (unsigned) ucs->int_in_buf[1] +
 672             (((unsigned) ucs->int_in_buf[2]) << 8);
 673
 674         gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
 675                 urb->actual_length, (int)ucs->int_in_buf[0], l,
 676                 (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
 677
 678         channel = 0;
 679
 680         switch (ucs->int_in_buf[0]) {
 681         case HD_DEVICE_INIT_OK:
 682                 update_basstate(ucs, BS_INIT, 0);
 683                 break;
 684
 685         case HD_READY_SEND_ATDATA:
 686                 del_timer(&ucs->timer_atrdy);
 687                 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
 688                 start_cbsend(cs);
 689                 break;
 690
 691         case HD_OPEN_B2CHANNEL_ACK:
 692                 ++channel;
 693         case HD_OPEN_B1CHANNEL_ACK:
 694                 bcs = cs->bcs + channel;
 695                 update_basstate(ucs, BS_B1OPEN << channel, 0);
 696                 gigaset_bchannel_up(bcs);
 697                 break;
 698
 699         case HD_OPEN_ATCHANNEL_ACK:
 700                 update_basstate(ucs, BS_ATOPEN, 0);
 701                 start_cbsend(cs);
 702                 break;
 703
 704         case HD_CLOSE_B2CHANNEL_ACK:
 705                 ++channel;
 706         case HD_CLOSE_B1CHANNEL_ACK:
 707                 bcs = cs->bcs + channel;
 708                 update_basstate(ucs, 0, BS_B1OPEN << channel);
 709                 stopurbs(bcs->hw.bas);
 710                 gigaset_bchannel_down(bcs);
 711                 break;
 712
 713         case HD_CLOSE_ATCHANNEL_ACK:
 714                 update_basstate(ucs, 0, BS_ATOPEN);
 715                 break;
 716
 717         case HD_B2_FLOW_CONTROL:
 718                 ++channel;
 719         case HD_B1_FLOW_CONTROL:
 720                 bcs = cs->bcs + channel;
 721                 atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
 722                            &bcs->hw.bas->corrbytes);
 723                 gig_dbg(DEBUG_ISO,
 724                         "Flow control (channel %d, sub %d): 0x%02x => %d",
 725                         channel, bcs->hw.bas->numsub, l,
 726                         atomic_read(&bcs->hw.bas->corrbytes));
 727                 break;
 728
 729         case HD_RECEIVEATDATA_ACK:      /* AT response ready to be received */
 730                 if (!l) {
 731                         dev_warn(cs->dev,
 732                                 "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
 733                         break;
 734                 }
 735                 spin_lock_irqsave(&cs->lock, flags);
 736                 if (ucs->rcvbuf_size) {
 737                         /* throw away previous buffer - we have no queue */
 738                         dev_err(cs->dev,
 739                                 "receive AT data overrun, %d bytes lost\n",
 740                                 ucs->rcvbuf_size);
 741                         kfree(ucs->rcvbuf);
 742                         ucs->rcvbuf_size = 0;
 743                 }
 744                 ucs->rcvbuf = kmalloc(l, GFP_ATOMIC);
 745                 if (ucs->rcvbuf == NULL) {
 746                         spin_unlock_irqrestore(&cs->lock, flags);
 747                         dev_err(cs->dev, "out of memory receiving AT data\n");
 748                         error_reset(cs);
 749                         break;
 750                 }
 751                 ucs->rcvbuf_size = l;
 752                 ucs->retry_cmd_in = 0;
 753                 rc = atread_submit(cs, BAS_TIMEOUT);
 754                 if (rc < 0) {
 755                         kfree(ucs->rcvbuf);
 756                         ucs->rcvbuf = NULL;
 757                         ucs->rcvbuf_size = 0;
 758                         if (rc != -ENODEV) {
 759                                 spin_unlock_irqrestore(&cs->lock, flags);
 760                                 error_reset(cs);
 761                                 break;
 762                         }
 763                 }
 764                 spin_unlock_irqrestore(&cs->lock, flags);
 765                 break;
 766
 767         case HD_RESET_INTERRUPT_PIPE_ACK:
 768                 update_basstate(ucs, 0, BS_RESETTING);
 769                 dev_notice(cs->dev, "interrupt pipe reset\n");
 770                 break;
 771
 772         case HD_SUSPEND_END:
 773                 gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
 774                 break;
 775
 776         default:
 777                 dev_warn(cs->dev,
 778                          "unknown Gigaset signal 0x%02x (%u) ignored\n",
 779                          (int) ucs->int_in_buf[0], l);
 780         }
 781
 782         check_pending(ucs);
 783         wake_up(&ucs->waitqueue);
 784
 785 resubmit:
 786         rc = usb_submit_urb(urb, GFP_ATOMIC);
 787         if (unlikely(rc != 0 && rc != -ENODEV)) {
 788                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
 789                         get_usb_rcmsg(rc));
 790                 error_reset(cs);
 791         }
 792 }
 793
 794 /* read_iso_callback
 795  * USB completion handler for B channel isochronous input
 796  * called by the USB subsystem in interrupt context
 797  * parameter:
 798  *      urb     USB request block of completed request
 799  *              urb->context = bc_state structure
 800  */
 801 static void read_iso_callback(struct urb *urb)
 802 {
 803         struct bc_state *bcs;
 804         struct bas_bc_state *ubc;
 805         int status = urb->status;
 806         unsigned long flags;
 807         int i, rc;
 808
 809         /* status codes not worth bothering the tasklet with */
 810         if (unlikely(status == -ENOENT ||
 811                      status == -ECONNRESET ||
 812                      status == -EINPROGRESS ||
 813                      status == -ENODEV ||
 814                      status == -ESHUTDOWN)) {
 815                 gig_dbg(DEBUG_ISO, "%s: %s",
 816                         __func__, get_usb_statmsg(status));
 817                 return;
 818         }
 819
 820         bcs = urb->context;
 821         ubc = bcs->hw.bas;
 822
 823         spin_lock_irqsave(&ubc->isoinlock, flags);
 824         if (likely(ubc->isoindone == NULL)) {
 825                 /* pass URB to tasklet */
 826                 ubc->isoindone = urb;
 827                 ubc->isoinstatus = status;
 828                 tasklet_hi_schedule(&ubc->rcvd_tasklet);
 829         } else {
 830                 /* tasklet still busy, drop data and resubmit URB */
 831                 ubc->loststatus = status;
 832                 for (i = 0; i < BAS_NUMFRAMES; i++) {
 833                         ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
 834                         if (unlikely(urb->iso_frame_desc[i].status != 0 &&
 835                                      urb->iso_frame_desc[i].status !=
 836                                                                 -EINPROGRESS))
 837                                 ubc->loststatus = urb->iso_frame_desc[i].status;
 838                         urb->iso_frame_desc[i].status = 0;
 839                         urb->iso_frame_desc[i].actual_length = 0;
 840                 }
 841                 if (likely(ubc->running)) {
 842                         /* urb->dev is clobbered by USB subsystem */
 843                         urb->dev = bcs->cs->hw.bas->udev;
 844                         urb->transfer_flags = URB_ISO_ASAP;
 845                         urb->number_of_packets = BAS_NUMFRAMES;
 846                         gig_dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit",
 847                                 __func__);
 848                         rc = usb_submit_urb(urb, GFP_ATOMIC);
 849                         if (unlikely(rc != 0 && rc != -ENODEV)) {
 850                                 dev_err(bcs->cs->dev,
 851                                         "could not resubmit isochronous read "
 852                                         "URB: %s\n", get_usb_rcmsg(rc));
 853                                 dump_urb(DEBUG_ISO, "isoc read", urb);
 854                                 error_hangup(bcs);
 855                         }
 856                 }
 857         }
 858         spin_unlock_irqrestore(&ubc->isoinlock, flags);
 859 }
 860
 861 /* write_iso_callback
 862  * USB completion handler for B channel isochronous output
 863  * called by the USB subsystem in interrupt context
 864  * parameter:
 865  *      urb     USB request block of completed request
 866  *              urb->context = isow_urbctx_t structure
 867  */
 868 static void write_iso_callback(struct urb *urb)
 869 {
 870         struct isow_urbctx_t *ucx;
 871         struct bas_bc_state *ubc;
 872         int status = urb->status;
 873         unsigned long flags;
 874
 875         /* status codes not worth bothering the tasklet with */
 876         if (unlikely(status == -ENOENT ||
 877                      status == -ECONNRESET ||
 878                      status == -EINPROGRESS ||
 879                      status == -ENODEV ||
 880                      status == -ESHUTDOWN)) {
 881                 gig_dbg(DEBUG_ISO, "%s: %s",
 882                         __func__, get_usb_statmsg(status));
 883                 return;
 884         }
 885
 886         /* pass URB context to tasklet */
 887         ucx = urb->context;
 888         ubc = ucx->bcs->hw.bas;
 889         ucx->status = status;
 890
 891         spin_lock_irqsave(&ubc->isooutlock, flags);
 892         ubc->isooutovfl = ubc->isooutdone;
 893         ubc->isooutdone = ucx;
 894         spin_unlock_irqrestore(&ubc->isooutlock, flags);
 895         tasklet_hi_schedule(&ubc->sent_tasklet);
 896 }
 897
 898 /* starturbs
 899  * prepare and submit USB request blocks for isochronous input and output
 900  * argument:
 901  *      B channel control structure
 902  * return value:
 903  *      0 on success
 904  *      < 0 on error (no URBs submitted)
 905  */
 906 static int starturbs(struct bc_state *bcs)
 907 {
 908         struct bas_bc_state *ubc = bcs->hw.bas;
 909         struct urb *urb;
 910         int j, k;
 911         int rc;
 912
 913         /* initialize L2 reception */
 914         if (bcs->proto2 == L2_HDLC)
 915                 bcs->inputstate |= INS_flag_hunt;
 916
 917         /* submit all isochronous input URBs */
 918         ubc->running = 1;
 919         for (k = 0; k < BAS_INURBS; k++) {
 920                 urb = ubc->isoinurbs[k];
 921                 if (!urb) {
 922                         rc = -EFAULT;
 923                         goto error;
 924                 }
 925
 926                 urb->dev = bcs->cs->hw.bas->udev;
 927                 urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
 928                 urb->transfer_flags = URB_ISO_ASAP;
 929                 urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
 930                 urb->transfer_buffer_length = BAS_INBUFSIZE;
 931                 urb->number_of_packets = BAS_NUMFRAMES;
 932                 urb->interval = BAS_FRAMETIME;
 933                 urb->complete = read_iso_callback;
 934                 urb->context = bcs;
 935                 for (j = 0; j < BAS_NUMFRAMES; j++) {
 936                         urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
 937                         urb->iso_frame_desc[j].length = BAS_MAXFRAME;
 938                         urb->iso_frame_desc[j].status = 0;
 939                         urb->iso_frame_desc[j].actual_length = 0;
 940                 }
 941
 942                 dump_urb(DEBUG_ISO, "Initial isoc read", urb);
 943                 rc = usb_submit_urb(urb, GFP_ATOMIC);
 944                 if (rc != 0)
 945                         goto error;
 946         }
 947
 948         /* initialize L2 transmission */
 949         gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
 950
 951         /* set up isochronous output URBs for flag idling */
 952         for (k = 0; k < BAS_OUTURBS; ++k) {
 953                 urb = ubc->isoouturbs[k].urb;
 954                 if (!urb) {
 955                         rc = -EFAULT;
 956                         goto error;
 957                 }
 958                 urb->dev = bcs->cs->hw.bas->udev;
 959                 urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
 960                 urb->transfer_flags = URB_ISO_ASAP;
 961                 urb->transfer_buffer = ubc->isooutbuf->data;
 962                 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
 963                 urb->number_of_packets = BAS_NUMFRAMES;
 964                 urb->interval = BAS_FRAMETIME;
 965                 urb->complete = write_iso_callback;
 966                 urb->context = &ubc->isoouturbs[k];
 967                 for (j = 0; j < BAS_NUMFRAMES; ++j) {
 968                         urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
 969                         urb->iso_frame_desc[j].length = BAS_NORMFRAME;
 970                         urb->iso_frame_desc[j].status = 0;
 971                         urb->iso_frame_desc[j].actual_length = 0;
 972                 }
 973                 ubc->isoouturbs[k].limit = -1;
 974         }
 975
 976         /* keep one URB free, submit the others */
 977         for (k = 0; k < BAS_OUTURBS-1; ++k) {
 978                 dump_urb(DEBUG_ISO, "Initial isoc write", urb);
 979                 rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
 980                 if (rc != 0)
 981                         goto error;
 982         }
 983         dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
 984         ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS-1];
 985         ubc->isooutdone = ubc->isooutovfl = NULL;
 986         return 0;
 987  error:
 988         stopurbs(ubc);
 989         return rc;
 990 }
 991
 992 /* stopurbs
 993  * cancel the USB request blocks for isochronous input and output
 994  * errors are silently ignored
 995  * argument:
 996  *      B channel control structure
 997  */
 998 static void stopurbs(struct bas_bc_state *ubc)
 999 {
1000         int k, rc;
1001
1002         ubc->running = 0;
1003
1004         for (k = 0; k < BAS_INURBS; ++k) {
1005                 rc = usb_unlink_urb(ubc->isoinurbs[k]);
1006                 gig_dbg(DEBUG_ISO,
1007                         "%s: isoc input URB %d unlinked, result = %s",
1008                         __func__, k, get_usb_rcmsg(rc));
1009         }
1010
1011         for (k = 0; k < BAS_OUTURBS; ++k) {
1012                 rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
1013                 gig_dbg(DEBUG_ISO,
1014                         "%s: isoc output URB %d unlinked, result = %s",
1015                         __func__, k, get_usb_rcmsg(rc));
1016         }
1017 }
1018
1019 /* Isochronous Write - Bottom Half */
1020 /* =============================== */
1021
1022 /* submit_iso_write_urb
1023  * fill and submit the next isochronous write URB
1024  * parameters:
1025  *      ucx     context structure containing URB
1026  * return value:
1027  *      number of frames submitted in URB
1028  *      0 if URB not submitted because no data available (isooutbuf busy)
1029  *      error code < 0 on error
1030  */
1031 static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
1032 {
1033         struct urb *urb = ucx->urb;
1034         struct bas_bc_state *ubc = ucx->bcs->hw.bas;
1035         struct usb_iso_packet_descriptor *ifd;
1036         int corrbytes, nframe, rc;
1037
1038         /* urb->dev is clobbered by USB subsystem */
1039         urb->dev = ucx->bcs->cs->hw.bas->udev;
1040         urb->transfer_flags = URB_ISO_ASAP;
1041         urb->transfer_buffer = ubc->isooutbuf->data;
1042         urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1043
1044         for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
1045                 ifd = &urb->iso_frame_desc[nframe];
1046
1047                 /* compute frame length according to flow control */
1048                 ifd->length = BAS_NORMFRAME;
1049                 corrbytes = atomic_read(&ubc->corrbytes);
1050                 if (corrbytes != 0) {
1051                         gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
1052                                 __func__, corrbytes);
1053                         if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
1054                                 corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
1055                         else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
1056                                 corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
1057                         ifd->length += corrbytes;
1058                         atomic_add(-corrbytes, &ubc->corrbytes);
1059                 }
1060
1061                 /* retrieve block of data to send */
1062                 rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
1063                 if (rc < 0) {
1064                         if (rc == -EBUSY) {
1065                                 gig_dbg(DEBUG_ISO,
1066                                         "%s: buffer busy at frame %d",
1067                                         __func__, nframe);
1068                                 /* tasklet will be restarted from
1069                                    gigaset_isoc_send_skb() */
1070                         } else {
1071                                 dev_err(ucx->bcs->cs->dev,
1072                                         "%s: buffer error %d at frame %d\n",
1073                                         __func__, rc, nframe);
1074                                 return rc;
1075                         }
1076                         break;
1077                 }
1078                 ifd->offset = rc;
1079                 ucx->limit = ubc->isooutbuf->nextread;
1080                 ifd->status = 0;
1081                 ifd->actual_length = 0;
1082         }
1083         if (unlikely(nframe == 0))
1084                 return 0;       /* no data to send */
1085         urb->number_of_packets = nframe;
1086
1087         rc = usb_submit_urb(urb, GFP_ATOMIC);
1088         if (unlikely(rc)) {
1089                 if (rc == -ENODEV)
1090                         /* device removed - give up silently */
1091                         gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
1092                 else
1093                         dev_err(ucx->bcs->cs->dev,
1094                                 "could not submit isochronous write URB: %s\n",
1095                                 get_usb_rcmsg(rc));
1096                 return rc;
1097         }
1098         ++ubc->numsub;
1099         return nframe;
1100 }
1101
1102 /* write_iso_tasklet
1103  * tasklet scheduled when an isochronous output URB from the Gigaset device
1104  * has completed
1105  * parameter:
1106  *      data    B channel state structure
1107  */
1108 static void write_iso_tasklet(unsigned long data)
1109 {
1110         struct bc_state *bcs = (struct bc_state *) data;
1111         struct bas_bc_state *ubc = bcs->hw.bas;
1112         struct cardstate *cs = bcs->cs;
1113         struct isow_urbctx_t *done, *next, *ovfl;
1114         struct urb *urb;
1115         int status;
1116         struct usb_iso_packet_descriptor *ifd;
1117         int offset;
1118         unsigned long flags;
1119         int i;
1120         struct sk_buff *skb;
1121         int len;
1122         int rc;
1123
1124         /* loop while completed URBs arrive in time */
1125         for (;;) {
1126                 if (unlikely(!(ubc->running))) {
1127                         gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1128                         return;
1129                 }
1130
1131                 /* retrieve completed URBs */
1132                 spin_lock_irqsave(&ubc->isooutlock, flags);
1133                 done = ubc->isooutdone;
1134                 ubc->isooutdone = NULL;
1135                 ovfl = ubc->isooutovfl;
1136                 ubc->isooutovfl = NULL;
1137                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1138                 if (ovfl) {
1139                         dev_err(cs->dev, "isochronous write buffer underrun\n");
1140                         error_hangup(bcs);
1141                         break;
1142                 }
1143                 if (!done)
1144                         break;
1145
1146                 /* submit free URB if available */
1147                 spin_lock_irqsave(&ubc->isooutlock, flags);
1148                 next = ubc->isooutfree;
1149                 ubc->isooutfree = NULL;
1150                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1151                 if (next) {
1152                         rc = submit_iso_write_urb(next);
1153                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1154                                 /* could not submit URB, put it back */
1155                                 spin_lock_irqsave(&ubc->isooutlock, flags);
1156                                 if (ubc->isooutfree == NULL) {
1157                                         ubc->isooutfree = next;
1158                                         next = NULL;
1159                                 }
1160                                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1161                                 if (next) {
1162                                         /* couldn't put it back */
1163                                         dev_err(cs->dev,
1164                                               "losing isochronous write URB\n");
1165                                         error_hangup(bcs);
1166                                 }
1167                         }
1168                 }
1169
1170                 /* process completed URB */
1171                 urb = done->urb;
1172                 status = done->status;
1173                 switch (status) {
1174                 case -EXDEV:                    /* partial completion */
1175                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1176                                 __func__);
1177                         /* fall through - what's the difference anyway? */
1178                 case 0:                         /* normal completion */
1179                         /* inspect individual frames
1180                          * assumptions (for lack of documentation):
1181                          * - actual_length bytes of first frame in error are
1182                          *   successfully sent
1183                          * - all following frames are not sent at all
1184                          */
1185                         offset = done->limit;   /* default (no error) */
1186                         for (i = 0; i < BAS_NUMFRAMES; i++) {
1187                                 ifd = &urb->iso_frame_desc[i];
1188                                 if (ifd->status ||
1189                                     ifd->actual_length != ifd->length) {
1190                                         dev_warn(cs->dev,
1191                                              "isochronous write: frame %d: %s, "
1192                                              "only %d of %d bytes sent\n",
1193                                              i, get_usb_statmsg(ifd->status),
1194                                              ifd->actual_length, ifd->length);
1195                                         offset = (ifd->offset +
1196                                                   ifd->actual_length)
1197                                                  % BAS_OUTBUFSIZE;
1198                                         break;
1199                                 }
1200                         }
1201 #ifdef CONFIG_GIGASET_DEBUG
1202                         /* check assumption on remaining frames */
1203                         for (; i < BAS_NUMFRAMES; i++) {
1204                                 ifd = &urb->iso_frame_desc[i];
1205                                 if (ifd->status != -EINPROGRESS
1206                                     || ifd->actual_length != 0) {
1207                                         dev_warn(cs->dev,
1208                                              "isochronous write: frame %d: %s, "
1209                                              "%d of %d bytes sent\n",
1210                                              i, get_usb_statmsg(ifd->status),
1211                                              ifd->actual_length, ifd->length);
1212                                         offset = (ifd->offset +
1213                                                   ifd->actual_length)
1214                                                  % BAS_OUTBUFSIZE;
1215                                         break;
1216                                 }
1217                         }
1218 #endif
1219                         break;
1220                 case -EPIPE:                    /* stall - probably underrun */
1221                         dev_err(cs->dev, "isochronous write stalled\n");
1222                         error_hangup(bcs);
1223                         break;
1224                 default:                        /* severe trouble */
1225                         dev_warn(cs->dev, "isochronous write: %s\n",
1226                                  get_usb_statmsg(status));
1227                 }
1228
1229                 /* mark the write buffer area covered by this URB as free */
1230                 if (done->limit >= 0)
1231                         ubc->isooutbuf->read = done->limit;
1232
1233                 /* mark URB as free */
1234                 spin_lock_irqsave(&ubc->isooutlock, flags);
1235                 next = ubc->isooutfree;
1236                 ubc->isooutfree = done;
1237                 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1238                 if (next) {
1239                         /* only one URB still active - resubmit one */
1240                         rc = submit_iso_write_urb(next);
1241                         if (unlikely(rc <= 0 && rc != -ENODEV)) {
1242                                 /* couldn't submit */
1243                                 error_hangup(bcs);
1244                         }
1245                 }
1246         }
1247
1248         /* process queued SKBs */
1249         while ((skb = skb_dequeue(&bcs->squeue))) {
1250                 /* copy to output buffer, doing L2 encapsulation */
1251                 len = skb->len;
1252                 if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
1253                         /* insufficient buffer space, push back onto queue */
1254                         skb_queue_head(&bcs->squeue, skb);
1255                         gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
1256                                 __func__, skb_queue_len(&bcs->squeue));
1257                         break;
1258                 }
1259                 skb_pull(skb, len);
1260                 gigaset_skb_sent(bcs, skb);
1261                 dev_kfree_skb_any(skb);
1262         }
1263 }
1264
1265 /* Isochronous Read - Bottom Half */
1266 /* ============================== */
1267
1268 /* read_iso_tasklet
1269  * tasklet scheduled when an isochronous input URB from the Gigaset device
1270  * has completed
1271  * parameter:
1272  *      data    B channel state structure
1273  */
1274 static void read_iso_tasklet(unsigned long data)
1275 {
1276         struct bc_state *bcs = (struct bc_state *) data;
1277         struct bas_bc_state *ubc = bcs->hw.bas;
1278         struct cardstate *cs = bcs->cs;
1279         struct urb *urb;
1280         int status;
1281         char *rcvbuf;
1282         unsigned long flags;
1283         int totleft, numbytes, offset, frame, rc;
1284
1285         /* loop while more completed URBs arrive in the meantime */
1286         for (;;) {
1287                 /* retrieve URB */
1288                 spin_lock_irqsave(&ubc->isoinlock, flags);
1289                 urb = ubc->isoindone;
1290                 if (!urb) {
1291                         spin_unlock_irqrestore(&ubc->isoinlock, flags);
1292                         return;
1293                 }
1294                 status = ubc->isoinstatus;
1295                 ubc->isoindone = NULL;
1296                 if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1297                         dev_warn(cs->dev,
1298                                  "isochronous read overrun, "
1299                                  "dropped URB with status: %s, %d bytes lost\n",
1300                                  get_usb_statmsg(ubc->loststatus),
1301                                  ubc->isoinlost);
1302                         ubc->loststatus = -EINPROGRESS;
1303                 }
1304                 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1305
1306                 if (unlikely(!(ubc->running))) {
1307                         gig_dbg(DEBUG_ISO,
1308                                 "%s: channel not running, "
1309                                 "dropped URB with status: %s",
1310                                 __func__, get_usb_statmsg(status));
1311                         return;
1312                 }
1313
1314                 switch (status) {
1315                 case 0:                         /* normal completion */
1316                         break;
1317                 case -EXDEV:                    /* inspect individual frames
1318                                                    (we do that anyway) */
1319                         gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1320                                 __func__);
1321                         break;
1322                 case -ENOENT:
1323                 case -ECONNRESET:
1324                 case -EINPROGRESS:
1325                         gig_dbg(DEBUG_ISO, "%s: %s",
1326                                 __func__, get_usb_statmsg(status));
1327                         continue;               /* -> skip */
1328                 case -EPIPE:
1329                         dev_err(cs->dev, "isochronous read stalled\n");
1330                         error_hangup(bcs);
1331                         continue;               /* -> skip */
1332                 default:                        /* severe trouble */
1333                         dev_warn(cs->dev, "isochronous read: %s\n",
1334                                  get_usb_statmsg(status));
1335                         goto error;
1336                 }
1337
1338                 rcvbuf = urb->transfer_buffer;
1339                 totleft = urb->actual_length;
1340                 for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1341                         numbytes = urb->iso_frame_desc[frame].actual_length;
1342                         if (unlikely(urb->iso_frame_desc[frame].status))
1343                                 dev_warn(cs->dev,
1344                                          "isochronous read: frame %d[%d]: %s\n",
1345                                          frame, numbytes,
1346                                          get_usb_statmsg(
1347                                             urb->iso_frame_desc[frame].status));
1348                         if (unlikely(numbytes > BAS_MAXFRAME))
1349                                 dev_warn(cs->dev,
1350                                          "isochronous read: frame %d: "
1351                                          "numbytes (%d) > BAS_MAXFRAME\n",
1352                                          frame, numbytes);
1353                         if (unlikely(numbytes > totleft)) {
1354                                 dev_warn(cs->dev,
1355                                          "isochronous read: frame %d: "
1356                                          "numbytes (%d) > totleft (%d)\n",
1357                                          frame, numbytes, totleft);
1358                                 numbytes = totleft;
1359                         }
1360                         offset = urb->iso_frame_desc[frame].offset;
1361                         if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1362                                 dev_warn(cs->dev,
1363                                          "isochronous read: frame %d: "
1364                                          "offset (%d) + numbytes (%d) "
1365                                          "> BAS_INBUFSIZE\n",
1366                                          frame, offset, numbytes);
1367                                 numbytes = BAS_INBUFSIZE - offset;
1368                         }
1369                         gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1370                         totleft -= numbytes;
1371                 }
1372                 if (unlikely(totleft > 0))
1373                         dev_warn(cs->dev,
1374                                  "isochronous read: %d data bytes missing\n",
1375                                  totleft);
1376
1377 error:
1378                 /* URB processed, resubmit */
1379                 for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1380                         urb->iso_frame_desc[frame].status = 0;
1381                         urb->iso_frame_desc[frame].actual_length = 0;
1382                 }
1383                 /* urb->dev is clobbered by USB subsystem */
1384                 urb->dev = bcs->cs->hw.bas->udev;
1385                 urb->transfer_flags = URB_ISO_ASAP;
1386                 urb->number_of_packets = BAS_NUMFRAMES;
1387                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1388                 if (unlikely(rc != 0 && rc != -ENODEV)) {
1389                         dev_err(cs->dev,
1390                                 "could not resubmit isochronous read URB: %s\n",
1391                                 get_usb_rcmsg(rc));
1392                         dump_urb(DEBUG_ISO, "resubmit iso read", urb);
1393                         error_hangup(bcs);
1394                 }
1395         }
1396 }
1397
1398 /* Channel Operations */
1399 /* ================== */
1400
1401 /* req_timeout
1402  * timeout routine for control output request
1403  * argument:
1404  *      B channel control structure
1405  */
1406 static void req_timeout(unsigned long data)
1407 {
1408         struct bc_state *bcs = (struct bc_state *) data;
1409         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1410         int pending;
1411         unsigned long flags;
1412
1413         check_pending(ucs);
1414
1415         spin_lock_irqsave(&ucs->lock, flags);
1416         pending = ucs->pending;
1417         ucs->pending = 0;
1418         spin_unlock_irqrestore(&ucs->lock, flags);
1419
1420         switch (pending) {
1421         case 0:                                 /* no pending request */
1422                 gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1423                 break;
1424
1425         case HD_OPEN_ATCHANNEL:
1426                 dev_err(bcs->cs->dev, "timeout opening AT channel\n");
1427                 error_reset(bcs->cs);
1428                 break;
1429
1430         case HD_OPEN_B2CHANNEL:
1431         case HD_OPEN_B1CHANNEL:
1432                 dev_err(bcs->cs->dev, "timeout opening channel %d\n",
1433                         bcs->channel + 1);
1434                 error_hangup(bcs);
1435                 break;
1436
1437         case HD_CLOSE_ATCHANNEL:
1438                 dev_err(bcs->cs->dev, "timeout closing AT channel\n");
1439                 error_reset(bcs->cs);
1440                 break;
1441
1442         case HD_CLOSE_B2CHANNEL:
1443         case HD_CLOSE_B1CHANNEL:
1444                 dev_err(bcs->cs->dev, "timeout closing channel %d\n",
1445                         bcs->channel + 1);
1446                 error_reset(bcs->cs);
1447                 break;
1448
1449         case HD_RESET_INTERRUPT_PIPE:
1450                 /* error recovery escalation */
1451                 dev_err(bcs->cs->dev,
1452                         "reset interrupt pipe timeout, attempting USB reset\n");
1453                 usb_queue_reset_device(bcs->cs->hw.bas->interface);
1454                 break;
1455
1456         default:
1457                 dev_warn(bcs->cs->dev, "request 0x%02x timed out, clearing\n",
1458                          pending);
1459         }
1460
1461         wake_up(&ucs->waitqueue);
1462 }
1463
1464 /* write_ctrl_callback
1465  * USB completion handler for control pipe output
1466  * called by the USB subsystem in interrupt context
1467  * parameter:
1468  *      urb     USB request block of completed request
1469  *              urb->context = hardware specific controller state structure
1470  */
1471 static void write_ctrl_callback(struct urb *urb)
1472 {
1473         struct bas_cardstate *ucs = urb->context;
1474         int status = urb->status;
1475         int rc;
1476         unsigned long flags;
1477
1478         /* check status */
1479         switch (status) {
1480         case 0:                                 /* normal completion */
1481                 spin_lock_irqsave(&ucs->lock, flags);
1482                 switch (ucs->pending) {
1483                 case HD_DEVICE_INIT_ACK:        /* no reply expected */
1484                         del_timer(&ucs->timer_ctrl);
1485                         ucs->pending = 0;
1486                         break;
1487                 }
1488                 spin_unlock_irqrestore(&ucs->lock, flags);
1489                 return;
1490
1491         case -ENOENT:                   /* cancelled */
1492         case -ECONNRESET:               /* cancelled (async) */
1493         case -EINPROGRESS:              /* pending */
1494         case -ENODEV:                   /* device removed */
1495         case -ESHUTDOWN:                /* device shut down */
1496                 /* ignore silently */
1497                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1498                         __func__, get_usb_statmsg(status));
1499                 break;
1500
1501         default:                                /* any failure */
1502                 /* don't retry if suspend requested */
1503                 if (++ucs->retry_ctrl > BAS_RETRY ||
1504                     (ucs->basstate & BS_SUSPEND)) {
1505                         dev_err(&ucs->interface->dev,
1506                                 "control request 0x%02x failed: %s\n",
1507                                 ucs->dr_ctrl.bRequest,
1508                                 get_usb_statmsg(status));
1509                         break;          /* give up */
1510                 }
1511                 dev_notice(&ucs->interface->dev,
1512                            "control request 0x%02x: %s, retry %d\n",
1513                            ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
1514                            ucs->retry_ctrl);
1515                 /* urb->dev is clobbered by USB subsystem */
1516                 urb->dev = ucs->udev;
1517                 rc = usb_submit_urb(urb, GFP_ATOMIC);
1518                 if (unlikely(rc)) {
1519                         dev_err(&ucs->interface->dev,
1520                                 "could not resubmit request 0x%02x: %s\n",
1521                                 ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
1522                         break;
1523                 }
1524                 /* resubmitted */
1525                 return;
1526         }
1527
1528         /* failed, clear pending request */
1529         spin_lock_irqsave(&ucs->lock, flags);
1530         del_timer(&ucs->timer_ctrl);
1531         ucs->pending = 0;
1532         spin_unlock_irqrestore(&ucs->lock, flags);
1533         wake_up(&ucs->waitqueue);
1534 }
1535
1536 /* req_submit
1537  * submit a control output request without message buffer to the Gigaset base
1538  * and optionally start a timeout
1539  * parameters:
1540  *      bcs     B channel control structure
1541  *      req     control request code (HD_*)
1542  *      val     control request parameter value (set to 0 if unused)
1543  *      timeout timeout in seconds (0: no timeout)
1544  * return value:
1545  *      0 on success
1546  *      -EBUSY if another request is pending
1547  *      any URB submission error code
1548  */
1549 static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1550 {
1551         struct bas_cardstate *ucs = bcs->cs->hw.bas;
1552         int ret;
1553         unsigned long flags;
1554
1555         gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1556
1557         spin_lock_irqsave(&ucs->lock, flags);
1558         if (ucs->pending) {
1559                 spin_unlock_irqrestore(&ucs->lock, flags);
1560                 dev_err(bcs->cs->dev,
1561                         "submission of request 0x%02x failed: "
1562                         "request 0x%02x still pending\n",
1563                         req, ucs->pending);
1564                 return -EBUSY;
1565         }
1566
1567         ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1568         ucs->dr_ctrl.bRequest = req;
1569         ucs->dr_ctrl.wValue = cpu_to_le16(val);
1570         ucs->dr_ctrl.wIndex = 0;
1571         ucs->dr_ctrl.wLength = 0;
1572         usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1573                              usb_sndctrlpipe(ucs->udev, 0),
1574                              (unsigned char *) &ucs->dr_ctrl, NULL, 0,
1575                              write_ctrl_callback, ucs);
1576         ucs->retry_ctrl = 0;
1577         ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
1578         if (unlikely(ret)) {
1579                 dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1580                         req, get_usb_rcmsg(ret));
1581                 spin_unlock_irqrestore(&ucs->lock, flags);
1582                 return ret;
1583         }
1584         ucs->pending = req;
1585
1586         if (timeout > 0) {
1587                 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1588                 ucs->timer_ctrl.expires = jiffies + timeout * HZ / 10;
1589                 ucs->timer_ctrl.data = (unsigned long) bcs;
1590                 ucs->timer_ctrl.function = req_timeout;
1591                 add_timer(&ucs->timer_ctrl);
1592         }
1593
1594         spin_unlock_irqrestore(&ucs->lock, flags);
1595         return 0;
1596 }
1597
1598 /* gigaset_init_bchannel
1599  * called by common.c to connect a B channel
1600  * initialize isochronous I/O and tell the Gigaset base to open the channel
1601  * argument:
1602  *      B channel control structure
1603  * return value:
1604  *      0 on success, error code < 0 on error
1605  */
1606 static int gigaset_init_bchannel(struct bc_state *bcs)
1607 {
1608         struct cardstate *cs = bcs->cs;
1609         int req, ret;
1610         unsigned long flags;
1611
1612         spin_lock_irqsave(&cs->lock, flags);
1613         if (unlikely(!cs->connected)) {
1614                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1615                 spin_unlock_irqrestore(&cs->lock, flags);
1616                 return -ENODEV;
1617         }
1618
1619         if (cs->hw.bas->basstate & BS_SUSPEND) {
1620                 dev_notice(cs->dev,
1621                            "not starting isochronous I/O, "
1622                            "suspend in progress\n");
1623                 spin_unlock_irqrestore(&cs->lock, flags);
1624                 return -EHOSTUNREACH;
1625         }
1626
1627         ret = starturbs(bcs);
1628         if (ret < 0) {
1629                 dev_err(cs->dev,
1630                         "could not start isochronous I/O for channel B%d: %s\n",
1631                         bcs->channel + 1,
1632                         ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
1633                 if (ret != -ENODEV)
1634                         error_hangup(bcs);
1635                 spin_unlock_irqrestore(&cs->lock, flags);
1636                 return ret;
1637         }
1638
1639         req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1640         ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1641         if (ret < 0) {
1642                 dev_err(cs->dev, "could not open channel B%d\n",
1643                         bcs->channel + 1);
1644                 stopurbs(bcs->hw.bas);
1645                 if (ret != -ENODEV)
1646                         error_hangup(bcs);
1647         }
1648
1649         spin_unlock_irqrestore(&cs->lock, flags);
1650         return ret;
1651 }
1652
1653 /* gigaset_close_bchannel
1654  * called by common.c to disconnect a B channel
1655  * tell the Gigaset base to close the channel
1656  * stopping isochronous I/O and LL notification will be done when the
1657  * acknowledgement for the close arrives
1658  * argument:
1659  *      B channel control structure
1660  * return value:
1661  *      0 on success, error code < 0 on error
1662  */
1663 static int gigaset_close_bchannel(struct bc_state *bcs)
1664 {
1665         struct cardstate *cs = bcs->cs;
1666         int req, ret;
1667         unsigned long flags;
1668
1669         spin_lock_irqsave(&cs->lock, flags);
1670         if (unlikely(!cs->connected)) {
1671                 spin_unlock_irqrestore(&cs->lock, flags);
1672                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1673                 return -ENODEV;
1674         }
1675
1676         if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1677                 /* channel not running: just signal common.c */
1678                 spin_unlock_irqrestore(&cs->lock, flags);
1679                 gigaset_bchannel_down(bcs);
1680                 return 0;
1681         }
1682
1683         /* channel running: tell device to close it */
1684         req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1685         ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1686         if (ret < 0)
1687                 dev_err(cs->dev, "closing channel B%d failed\n",
1688                         bcs->channel + 1);
1689
1690         spin_unlock_irqrestore(&cs->lock, flags);
1691         return ret;
1692 }
1693
1694 /* Device Operations */
1695 /* ================= */
1696
1697 /* complete_cb
1698  * unqueue first command buffer from queue, waking any sleepers
1699  * must be called with cs->cmdlock held
1700  * parameter:
1701  *      cs      controller state structure
1702  */
1703 static void complete_cb(struct cardstate *cs)
1704 {
1705         struct cmdbuf_t *cb = cs->cmdbuf;
1706
1707         /* unqueue completed buffer */
1708         cs->cmdbytes -= cs->curlen;
1709         gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD,
1710                 "write_command: sent %u bytes, %u left",
1711                 cs->curlen, cs->cmdbytes);
1712         if (cb->next != NULL) {
1713                 cs->cmdbuf = cb->next;
1714                 cs->cmdbuf->prev = NULL;
1715                 cs->curlen = cs->cmdbuf->len;
1716         } else {
1717                 cs->cmdbuf = NULL;
1718                 cs->lastcmdbuf = NULL;
1719                 cs->curlen = 0;
1720         }
1721
1722         if (cb->wake_tasklet)
1723                 tasklet_schedule(cb->wake_tasklet);
1724
1725         kfree(cb);
1726 }
1727
1728 /* write_command_callback
1729  * USB completion handler for AT command transmission
1730  * called by the USB subsystem in interrupt context
1731  * parameter:
1732  *      urb     USB request block of completed request
1733  *              urb->context = controller state structure
1734  */
1735 static void write_command_callback(struct urb *urb)
1736 {
1737         struct cardstate *cs = urb->context;
1738         struct bas_cardstate *ucs = cs->hw.bas;
1739         int status = urb->status;
1740         unsigned long flags;
1741
1742         update_basstate(ucs, 0, BS_ATWRPEND);
1743         wake_up(&ucs->waitqueue);
1744
1745         /* check status */
1746         switch (status) {
1747         case 0:                                 /* normal completion */
1748                 break;
1749         case -ENOENT:                   /* cancelled */
1750         case -ECONNRESET:               /* cancelled (async) */
1751         case -EINPROGRESS:              /* pending */
1752         case -ENODEV:                   /* device removed */
1753         case -ESHUTDOWN:                /* device shut down */
1754                 /* ignore silently */
1755                 gig_dbg(DEBUG_USBREQ, "%s: %s",
1756                         __func__, get_usb_statmsg(status));
1757                 return;
1758         default:                                /* any failure */
1759                 if (++ucs->retry_cmd_out > BAS_RETRY) {
1760                         dev_warn(cs->dev,
1761                                  "command write: %s, "
1762                                  "giving up after %d retries\n",
1763                                  get_usb_statmsg(status),
1764                                  ucs->retry_cmd_out);
1765                         break;
1766                 }
1767                 if (ucs->basstate & BS_SUSPEND) {
1768                         dev_warn(cs->dev,
1769                                  "command write: %s, "
1770                                  "won't retry - suspend requested\n",
1771                                  get_usb_statmsg(status));
1772                         break;
1773                 }
1774                 if (cs->cmdbuf == NULL) {
1775                         dev_warn(cs->dev,
1776                                  "command write: %s, "
1777                                  "cannot retry - cmdbuf gone\n",
1778                                  get_usb_statmsg(status));
1779                         break;
1780                 }
1781                 dev_notice(cs->dev, "command write: %s, retry %d\n",
1782                            get_usb_statmsg(status), ucs->retry_cmd_out);
1783                 if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1784                         /* resubmitted - bypass regular exit block */
1785                         return;
1786                 /* command send failed, assume base still waiting */
1787                 update_basstate(ucs, BS_ATREADY, 0);
1788         }
1789
1790         spin_lock_irqsave(&cs->cmdlock, flags);
1791         if (cs->cmdbuf != NULL)
1792                 complete_cb(cs);
1793         spin_unlock_irqrestore(&cs->cmdlock, flags);
1794 }
1795
1796 /* atrdy_timeout
1797  * timeout routine for AT command transmission
1798  * argument:
1799  *      controller state structure
1800  */
1801 static void atrdy_timeout(unsigned long data)
1802 {
1803         struct cardstate *cs = (struct cardstate *) data;
1804         struct bas_cardstate *ucs = cs->hw.bas;
1805
1806         dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1807
1808         /* fake the missing signal - what else can I do? */
1809         update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1810         start_cbsend(cs);
1811 }
1812
1813 /* atwrite_submit
1814  * submit an HD_WRITE_ATMESSAGE command URB
1815  * parameters:
1816  *      cs      controller state structure
1817  *      buf     buffer containing command to send
1818  *      len     length of command to send
1819  * return value:
1820  *      0 on success
1821  *      -EBUSY if another request is pending
1822  *      any URB submission error code
1823  */
1824 static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1825 {
1826         struct bas_cardstate *ucs = cs->hw.bas;
1827         int rc;
1828
1829         gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1830
1831         if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1832                 dev_err(cs->dev,
1833                         "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1834                 return -EBUSY;
1835         }
1836
1837         ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1838         ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1839         ucs->dr_cmd_out.wValue = 0;
1840         ucs->dr_cmd_out.wIndex = 0;
1841         ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1842         usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1843                              usb_sndctrlpipe(ucs->udev, 0),
1844                              (unsigned char *) &ucs->dr_cmd_out, buf, len,
1845                              write_command_callback, cs);
1846         rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
1847         if (unlikely(rc)) {
1848                 update_basstate(ucs, 0, BS_ATWRPEND);
1849                 dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1850                         get_usb_rcmsg(rc));
1851                 return rc;
1852         }
1853
1854         /* submitted successfully, start timeout if necessary */
1855         if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1856                 gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
1857                         ATRDY_TIMEOUT);
1858                 ucs->timer_atrdy.expires = jiffies + ATRDY_TIMEOUT * HZ / 10;
1859                 ucs->timer_atrdy.data = (unsigned long) cs;
1860                 ucs->timer_atrdy.function = atrdy_timeout;
1861                 add_timer(&ucs->timer_atrdy);
1862         }
1863         return 0;
1864 }
1865
1866 /* start_cbsend
1867  * start transmission of AT command queue if necessary
1868  * parameter:
1869  *      cs              controller state structure
1870  * return value:
1871  *      0 on success
1872  *      error code < 0 on error
1873  */
1874 static int start_cbsend(struct cardstate *cs)
1875 {
1876         struct cmdbuf_t *cb;
1877         struct bas_cardstate *ucs = cs->hw.bas;
1878         unsigned long flags;
1879         int rc;
1880         int retval = 0;
1881
1882         /* check if suspend requested */
1883         if (ucs->basstate & BS_SUSPEND) {
1884                 gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "suspending");
1885                 return -EHOSTUNREACH;
1886         }
1887
1888         /* check if AT channel is open */
1889         if (!(ucs->basstate & BS_ATOPEN)) {
1890                 gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "AT channel not open");
1891                 rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1892                 if (rc < 0) {
1893                         /* flush command queue */
1894                         spin_lock_irqsave(&cs->cmdlock, flags);
1895                         while (cs->cmdbuf != NULL)
1896                                 complete_cb(cs);
1897                         spin_unlock_irqrestore(&cs->cmdlock, flags);
1898                 }
1899                 return rc;
1900         }
1901
1902         /* try to send first command in queue */
1903         spin_lock_irqsave(&cs->cmdlock, flags);
1904
1905         while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
1906                 ucs->retry_cmd_out = 0;
1907                 rc = atwrite_submit(cs, cb->buf, cb->len);
1908                 if (unlikely(rc)) {
1909                         retval = rc;
1910                         complete_cb(cs);
1911                 }
1912         }
1913
1914         spin_unlock_irqrestore(&cs->cmdlock, flags);
1915         return retval;
1916 }
1917
1918 /* gigaset_write_cmd
1919  * This function is called by the device independent part of the driver
1920  * to transmit an AT command string to the Gigaset device.
1921  * It encapsulates the device specific method for transmission over the
1922  * direct USB connection to the base.
1923  * The command string is added to the queue of commands to send, and
1924  * USB transmission is started if necessary.
1925  * parameters:
1926  *      cs              controller state structure
1927  *      buf             command string to send
1928  *      len             number of bytes to send (max. IF_WRITEBUF)
1929  *      wake_tasklet    tasklet to run when transmission is completed
1930  *                      (NULL if none)
1931  * return value:
1932  *      number of bytes queued on success
1933  *      error code < 0 on error
1934  */
1935 static int gigaset_write_cmd(struct cardstate *cs,
1936                              const unsigned char *buf, int len,
1937                              struct tasklet_struct *wake_tasklet)
1938 {
1939         struct cmdbuf_t *cb;
1940         unsigned long flags;
1941         int rc;
1942
1943         gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
1944                              DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1945                            "CMD Transmit", len, buf);
1946
1947         if (len <= 0) {
1948                 /* nothing to do */
1949                 rc = 0;
1950                 goto notqueued;
1951         }
1952
1953         /* translate "+++" escape sequence sent as a single separate command
1954          * into "close AT channel" command for error recovery
1955          * The next command will reopen the AT channel automatically.
1956          */
1957         if (len == 3 && !memcmp(buf, "+++", 3)) {
1958                 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
1959                 goto notqueued;
1960         }
1961
1962         if (len > IF_WRITEBUF)
1963                 len = IF_WRITEBUF;
1964         cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC);
1965         if (!cb) {
1966                 dev_err(cs->dev, "%s: out of memory\n", __func__);
1967                 rc = -ENOMEM;
1968                 goto notqueued;
1969         }
1970
1971         memcpy(cb->buf, buf, len);
1972         cb->len = len;
1973         cb->offset = 0;
1974         cb->next = NULL;
1975         cb->wake_tasklet = wake_tasklet;
1976
1977         spin_lock_irqsave(&cs->cmdlock, flags);
1978         cb->prev = cs->lastcmdbuf;
1979         if (cs->lastcmdbuf)
1980                 cs->lastcmdbuf->next = cb;
1981         else {
1982                 cs->cmdbuf = cb;
1983                 cs->curlen = len;
1984         }
1985         cs->cmdbytes += len;
1986         cs->lastcmdbuf = cb;
1987         spin_unlock_irqrestore(&cs->cmdlock, flags);
1988
1989         spin_lock_irqsave(&cs->lock, flags);
1990         if (unlikely(!cs->connected)) {
1991                 spin_unlock_irqrestore(&cs->lock, flags);
1992                 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1993                 /* flush command queue */
1994                 spin_lock_irqsave(&cs->cmdlock, flags);
1995                 while (cs->cmdbuf != NULL)
1996                         complete_cb(cs);
1997                 spin_unlock_irqrestore(&cs->cmdlock, flags);
1998                 return -ENODEV;
1999         }
2000         rc = start_cbsend(cs);
2001         spin_unlock_irqrestore(&cs->lock, flags);
2002         return rc < 0 ? rc : len;
2003
2004 notqueued:                      /* request handled without queuing */
2005         if (wake_tasklet)
2006                 tasklet_schedule(wake_tasklet);
2007         return rc;
2008 }
2009
2010 /* gigaset_write_room
2011  * tty_driver.write_room interface routine
2012  * return number of characters the driver will accept to be written via
2013  * gigaset_write_cmd
2014  * parameter:
2015  *      controller state structure
2016  * return value:
2017  *      number of characters
2018  */
2019 static int gigaset_write_room(struct cardstate *cs)
2020 {
2021         return IF_WRITEBUF;
2022 }
2023
2024 /* gigaset_chars_in_buffer
2025  * tty_driver.chars_in_buffer interface routine
2026  * return number of characters waiting to be sent
2027  * parameter:
2028  *      controller state structure
2029  * return value:
2030  *      number of characters
2031  */
2032 static int gigaset_chars_in_buffer(struct cardstate *cs)
2033 {
2034         return cs->cmdbytes;
2035 }
2036
2037 /* gigaset_brkchars
2038  * implementation of ioctl(GIGASET_BRKCHARS)
2039  * parameter:
2040  *      controller state structure
2041  * return value:
2042  *      -EINVAL (unimplemented function)
2043  */
2044 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
2045 {
2046         return -EINVAL;
2047 }
2048
2049
2050 /* Device Initialization/Shutdown */
2051 /* ============================== */
2052
2053 /* Free hardware dependent part of the B channel structure
2054  * parameter:
2055  *      bcs     B channel structure
2056  * return value:
2057  *      !=0 on success
2058  */
2059 static int gigaset_freebcshw(struct bc_state *bcs)
2060 {
2061         struct bas_bc_state *ubc = bcs->hw.bas;
2062         int i;
2063
2064         if (!ubc)
2065                 return 0;
2066
2067         /* kill URBs and tasklets before freeing - better safe than sorry */
2068         ubc->running = 0;
2069         gig_dbg(DEBUG_INIT, "%s: killing iso URBs", __func__);
2070         for (i = 0; i < BAS_OUTURBS; ++i) {
2071                 usb_kill_urb(ubc->isoouturbs[i].urb);
2072                 usb_free_urb(ubc->isoouturbs[i].urb);
2073         }
2074         for (i = 0; i < BAS_INURBS; ++i) {
2075                 usb_kill_urb(ubc->isoinurbs[i]);
2076                 usb_free_urb(ubc->isoinurbs[i]);
2077         }
2078         tasklet_kill(&ubc->sent_tasklet);
2079         tasklet_kill(&ubc->rcvd_tasklet);
2080         kfree(ubc->isooutbuf);
2081         kfree(ubc);
2082         bcs->hw.bas = NULL;
2083         return 1;
2084 }
2085
2086 /* Initialize hardware dependent part of the B channel structure
2087  * parameter:
2088  *      bcs     B channel structure
2089  * return value:
2090  *      !=0 on success
2091  */
2092 static int gigaset_initbcshw(struct bc_state *bcs)
2093 {
2094         int i;
2095         struct bas_bc_state *ubc;
2096
2097         bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
2098         if (!ubc) {
2099                 pr_err("out of memory\n");
2100                 return 0;
2101         }
2102
2103         ubc->running = 0;
2104         atomic_set(&ubc->corrbytes, 0);
2105         spin_lock_init(&ubc->isooutlock);
2106         for (i = 0; i < BAS_OUTURBS; ++i) {
2107                 ubc->isoouturbs[i].urb = NULL;
2108                 ubc->isoouturbs[i].bcs = bcs;
2109         }
2110         ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
2111         ubc->numsub = 0;
2112         ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL);
2113         if (!ubc->isooutbuf) {
2114                 pr_err("out of memory\n");
2115                 kfree(ubc);
2116                 bcs->hw.bas = NULL;
2117                 return 0;
2118         }
2119         tasklet_init(&ubc->sent_tasklet,
2120                      write_iso_tasklet, (unsigned long) bcs);
2121
2122         spin_lock_init(&ubc->isoinlock);
2123         for (i = 0; i < BAS_INURBS; ++i)
2124                 ubc->isoinurbs[i] = NULL;
2125         ubc->isoindone = NULL;
2126         ubc->loststatus = -EINPROGRESS;
2127         ubc->isoinlost = 0;
2128         ubc->seqlen = 0;
2129         ubc->inbyte = 0;
2130         ubc->inbits = 0;
2131         ubc->goodbytes = 0;
2132         ubc->alignerrs = 0;
2133         ubc->fcserrs = 0;
2134         ubc->frameerrs = 0;
2135         ubc->giants = 0;
2136         ubc->runts = 0;
2137         ubc->aborts = 0;
2138         ubc->shared0s = 0;
2139         ubc->stolen0s = 0;
2140         tasklet_init(&ubc->rcvd_tasklet,
2141                      read_iso_tasklet, (unsigned long) bcs);
2142         return 1;
2143 }
2144
2145 static void gigaset_reinitbcshw(struct bc_state *bcs)
2146 {
2147         struct bas_bc_state *ubc = bcs->hw.bas;
2148
2149         bcs->hw.bas->running = 0;
2150         atomic_set(&bcs->hw.bas->corrbytes, 0);
2151         bcs->hw.bas->numsub = 0;
2152         spin_lock_init(&ubc->isooutlock);
2153         spin_lock_init(&ubc->isoinlock);
2154         ubc->loststatus = -EINPROGRESS;
2155 }
2156
2157 static void gigaset_freecshw(struct cardstate *cs)
2158 {
2159         /* timers, URBs and rcvbuf are disposed of in disconnect */
2160         kfree(cs->hw.bas->int_in_buf);
2161         kfree(cs->hw.bas);
2162         cs->hw.bas = NULL;
2163 }
2164
2165 static int gigaset_initcshw(struct cardstate *cs)
2166 {
2167         struct bas_cardstate *ucs;
2168
2169         cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
2170         if (!ucs) {
2171                 pr_err("out of memory\n");
2172                 return 0;
2173         }
2174         ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
2175         if (!ucs->int_in_buf) {
2176                 kfree(ucs);
2177                 pr_err("out of memory\n");
2178                 return 0;
2179         }
2180
2181         ucs->urb_cmd_in = NULL;
2182         ucs->urb_cmd_out = NULL;
2183         ucs->rcvbuf = NULL;
2184         ucs->rcvbuf_size = 0;
2185
2186         spin_lock_init(&ucs->lock);
2187         ucs->pending = 0;
2188
2189         ucs->basstate = 0;
2190         init_timer(&ucs->timer_ctrl);
2191         init_timer(&ucs->timer_atrdy);
2192         init_timer(&ucs->timer_cmd_in);
2193         init_waitqueue_head(&ucs->waitqueue);
2194
2195         return 1;
2196 }
2197
2198 /* freeurbs
2199  * unlink and deallocate all URBs unconditionally
2200  * caller must make sure that no commands are still in progress
2201  * parameter:
2202  *      cs      controller state structure
2203  */
2204 static void freeurbs(struct cardstate *cs)
2205 {
2206         struct bas_cardstate *ucs = cs->hw.bas;
2207         struct bas_bc_state *ubc;
2208         int i, j;
2209
2210         gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
2211         for (j = 0; j < BAS_CHANNELS; ++j) {
2212                 ubc = cs->bcs[j].hw.bas;
2213                 for (i = 0; i < BAS_OUTURBS; ++i) {
2214                         usb_kill_urb(ubc->isoouturbs[i].urb);
2215                         usb_free_urb(ubc->isoouturbs[i].urb);
2216                         ubc->isoouturbs[i].urb = NULL;
2217                 }
2218                 for (i = 0; i < BAS_INURBS; ++i) {
2219                         usb_kill_urb(ubc->isoinurbs[i]);
2220                         usb_free_urb(ubc->isoinurbs[i]);
2221                         ubc->isoinurbs[i] = NULL;
2222                 }
2223         }
2224         usb_kill_urb(ucs->urb_int_in);
2225         usb_free_urb(ucs->urb_int_in);
2226         ucs->urb_int_in = NULL;
2227         usb_kill_urb(ucs->urb_cmd_out);
2228         usb_free_urb(ucs->urb_cmd_out);
2229         ucs->urb_cmd_out = NULL;
2230         usb_kill_urb(ucs->urb_cmd_in);
2231         usb_free_urb(ucs->urb_cmd_in);
2232         ucs->urb_cmd_in = NULL;
2233         usb_kill_urb(ucs->urb_ctrl);
2234         usb_free_urb(ucs->urb_ctrl);
2235         ucs->urb_ctrl = NULL;
2236 }
2237
2238 /* gigaset_probe
2239  * This function is called when a new USB device is connected.
2240  * It checks whether the new device is handled by this driver.
2241  */
2242 static int gigaset_probe(struct usb_interface *interface,
2243                          const struct usb_device_id *id)
2244 {
2245         struct usb_host_interface *hostif;
2246         struct usb_device *udev = interface_to_usbdev(interface);
2247         struct cardstate *cs = NULL;
2248         struct bas_cardstate *ucs = NULL;
2249         struct bas_bc_state *ubc;
2250         struct usb_endpoint_descriptor *endpoint;
2251         int i, j;
2252         int rc;
2253
2254         gig_dbg(DEBUG_ANY,
2255                 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2256                 __func__, le16_to_cpu(udev->descriptor.idVendor),
2257                 le16_to_cpu(udev->descriptor.idProduct));
2258
2259         /* set required alternate setting */
2260         hostif = interface->cur_altsetting;
2261         if (hostif->desc.bAlternateSetting != 3) {
2262                 gig_dbg(DEBUG_ANY,
2263                         "%s: wrong alternate setting %d - trying to switch",
2264                         __func__, hostif->desc.bAlternateSetting);
2265                 if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3)
2266                     < 0) {
2267                         dev_warn(&udev->dev, "usb_set_interface failed, "
2268                                  "device %d interface %d altsetting %d\n",
2269                                  udev->devnum, hostif->desc.bInterfaceNumber,
2270                                  hostif->desc.bAlternateSetting);
2271                         return -ENODEV;
2272                 }
2273                 hostif = interface->cur_altsetting;
2274         }
2275
2276         /* Reject application specific interfaces
2277          */
2278         if (hostif->desc.bInterfaceClass != 255) {
2279                 dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
2280                          __func__, hostif->desc.bInterfaceClass);
2281                 return -ENODEV;
2282         }
2283
2284         dev_info(&udev->dev,
2285                  "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
2286                  __func__, le16_to_cpu(udev->descriptor.idVendor),
2287                  le16_to_cpu(udev->descriptor.idProduct));
2288
2289         /* allocate memory for our device state and intialize it */
2290         cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
2291                             GIGASET_MODULENAME);
2292         if (!cs)
2293                 return -ENODEV;
2294         ucs = cs->hw.bas;
2295
2296         /* save off device structure ptrs for later use */
2297         usb_get_dev(udev);
2298         ucs->udev = udev;
2299         ucs->interface = interface;
2300         cs->dev = &interface->dev;
2301
2302         /* allocate URBs:
2303          * - one for the interrupt pipe
2304          * - three for the different uses of the default control pipe
2305          * - three for each isochronous pipe
2306          */
2307         if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2308             !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2309             !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
2310             !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
2311                 goto allocerr;
2312
2313         for (j = 0; j < BAS_CHANNELS; ++j) {
2314                 ubc = cs->bcs[j].hw.bas;
2315                 for (i = 0; i < BAS_OUTURBS; ++i)
2316                         if (!(ubc->isoouturbs[i].urb =
2317                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2318                                 goto allocerr;
2319                 for (i = 0; i < BAS_INURBS; ++i)
2320                         if (!(ubc->isoinurbs[i] =
2321                               usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2322                                 goto allocerr;
2323         }
2324
2325         ucs->rcvbuf = NULL;
2326         ucs->rcvbuf_size = 0;
2327
2328         /* Fill the interrupt urb and send it to the core */
2329         endpoint = &hostif->endpoint[0].desc;
2330         usb_fill_int_urb(ucs->urb_int_in, udev,
2331                          usb_rcvintpipe(udev,
2332                                         (endpoint->bEndpointAddress) & 0x0f),
2333                          ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
2334                          endpoint->bInterval);
2335         rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2336         if (rc != 0) {
2337                 dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2338                         get_usb_rcmsg(rc));
2339                 goto error;
2340         }
2341
2342         /* tell the device that the driver is ready */
2343         rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0);
2344         if (rc != 0)
2345                 goto error;
2346
2347         /* tell common part that the device is ready */
2348         if (startmode == SM_LOCKED)
2349                 cs->mstate = MS_LOCKED;
2350
2351         /* save address of controller structure */
2352         usb_set_intfdata(interface, cs);
2353
2354         if (!gigaset_start(cs))
2355                 goto error;
2356
2357         return 0;
2358
2359 allocerr:
2360         dev_err(cs->dev, "could not allocate URBs\n");
2361 error:
2362         freeurbs(cs);
2363         usb_set_intfdata(interface, NULL);
2364         gigaset_freecs(cs);
2365         return -ENODEV;
2366 }
2367
2368 /* gigaset_disconnect
2369  * This function is called when the Gigaset base is unplugged.
2370  */
2371 static void gigaset_disconnect(struct usb_interface *interface)
2372 {
2373         struct cardstate *cs;
2374         struct bas_cardstate *ucs;
2375         int j;
2376
2377         cs = usb_get_intfdata(interface);
2378
2379         ucs = cs->hw.bas;
2380
2381         dev_info(cs->dev, "disconnecting Gigaset base\n");
2382
2383         /* mark base as not ready, all channels disconnected */
2384         ucs->basstate = 0;
2385
2386         /* tell LL all channels are down */
2387         for (j = 0; j < BAS_CHANNELS; ++j)
2388                 gigaset_bchannel_down(cs->bcs + j);
2389
2390         /* stop driver (common part) */
2391         gigaset_stop(cs);
2392
2393         /* stop timers and URBs, free ressources */
2394         del_timer_sync(&ucs->timer_ctrl);
2395         del_timer_sync(&ucs->timer_atrdy);
2396         del_timer_sync(&ucs->timer_cmd_in);
2397         freeurbs(cs);
2398         usb_set_intfdata(interface, NULL);
2399         kfree(ucs->rcvbuf);
2400         ucs->rcvbuf = NULL;
2401         ucs->rcvbuf_size = 0;
2402         usb_put_dev(ucs->udev);
2403         ucs->interface = NULL;
2404         ucs->udev = NULL;
2405         cs->dev = NULL;
2406         gigaset_freecs(cs);
2407 }
2408
2409 /* gigaset_suspend
2410  * This function is called before the USB connection is suspended.
2411  */
2412 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
2413 {
2414         struct cardstate *cs = usb_get_intfdata(intf);
2415         struct bas_cardstate *ucs = cs->hw.bas;
2416         int rc;
2417
2418         /* set suspend flag; this stops AT command/response traffic */
2419         if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
2420                 gig_dbg(DEBUG_SUSPEND, "already suspended");
2421                 return 0;
2422         }
2423
2424         /* wait a bit for blocking conditions to go away */
2425         rc = wait_event_timeout(ucs->waitqueue,
2426                         !(ucs->basstate &
2427                           (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)),
2428                         BAS_TIMEOUT*HZ/10);
2429         gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
2430
2431         /* check for conditions preventing suspend */
2432         if (ucs->basstate & (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)) {
2433                 dev_warn(cs->dev, "cannot suspend:\n");
2434                 if (ucs->basstate & BS_B1OPEN)
2435                         dev_warn(cs->dev, " B channel 1 open\n");
2436                 if (ucs->basstate & BS_B2OPEN)
2437                         dev_warn(cs->dev, " B channel 2 open\n");
2438                 if (ucs->basstate & BS_ATRDPEND)
2439                         dev_warn(cs->dev, " receiving AT reply\n");
2440                 if (ucs->basstate & BS_ATWRPEND)
2441                         dev_warn(cs->dev, " sending AT command\n");
2442                 update_basstate(ucs, 0, BS_SUSPEND);
2443                 return -EBUSY;
2444         }
2445
2446         /* close AT channel if open */
2447         if (ucs->basstate & BS_ATOPEN) {
2448                 gig_dbg(DEBUG_SUSPEND, "closing AT channel");
2449                 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
2450                 if (rc) {
2451                         update_basstate(ucs, 0, BS_SUSPEND);
2452                         return rc;
2453                 }
2454                 wait_event_timeout(ucs->waitqueue, !ucs->pending,
2455                                    BAS_TIMEOUT*HZ/10);
2456                 /* in case of timeout, proceed anyway */
2457         }
2458
2459         /* kill all URBs and timers that might still be pending */
2460         usb_kill_urb(ucs->urb_ctrl);
2461         usb_kill_urb(ucs->urb_int_in);
2462         del_timer_sync(&ucs->timer_ctrl);
2463
2464         gig_dbg(DEBUG_SUSPEND, "suspend complete");
2465         return 0;
2466 }
2467
2468 /* gigaset_resume
2469  * This function is called after the USB connection has been resumed.
2470  */
2471 static int gigaset_resume(struct usb_interface *intf)
2472 {
2473         struct cardstate *cs = usb_get_intfdata(intf);
2474         struct bas_cardstate *ucs = cs->hw.bas;
2475         int rc;
2476
2477         /* resubmit interrupt URB for spontaneous messages from base */
2478         rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2479         if (rc) {
2480                 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
2481                         get_usb_rcmsg(rc));
2482                 return rc;
2483         }
2484
2485         /* clear suspend flag to reallow activity */
2486         update_basstate(ucs, 0, BS_SUSPEND);
2487
2488         gig_dbg(DEBUG_SUSPEND, "resume complete");
2489         return 0;
2490 }
2491
2492 /* gigaset_pre_reset
2493  * This function is called before the USB connection is reset.
2494  */
2495 static int gigaset_pre_reset(struct usb_interface *intf)
2496 {
2497         /* handle just like suspend */
2498         return gigaset_suspend(intf, PMSG_ON);
2499 }
2500
2501 /* gigaset_post_reset
2502  * This function is called after the USB connection has been reset.
2503  */
2504 static int gigaset_post_reset(struct usb_interface *intf)
2505 {
2506         /* FIXME: send HD_DEVICE_INIT_ACK? */
2507
2508         /* resume operations */
2509         return gigaset_resume(intf);
2510 }
2511
2512
2513 static const struct gigaset_ops gigops = {
2514         gigaset_write_cmd,
2515         gigaset_write_room,
2516         gigaset_chars_in_buffer,
2517         gigaset_brkchars,
2518         gigaset_init_bchannel,
2519         gigaset_close_bchannel,
2520         gigaset_initbcshw,
2521         gigaset_freebcshw,
2522         gigaset_reinitbcshw,
2523         gigaset_initcshw,
2524         gigaset_freecshw,
2525         gigaset_set_modem_ctrl,
2526         gigaset_baud_rate,
2527         gigaset_set_line_ctrl,
2528         gigaset_isoc_send_skb,
2529         gigaset_isoc_input,
2530 };
2531
2532 /* bas_gigaset_init
2533  * This function is called after the kernel module is loaded.
2534  */
2535 static int __init bas_gigaset_init(void)
2536 {
2537         int result;
2538
2539         /* allocate memory for our driver state and intialize it */
2540         driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2541                                     GIGASET_MODULENAME, GIGASET_DEVNAME,
2542                                     &gigops, THIS_MODULE);
2543         if (driver == NULL)
2544                 goto error;
2545
2546         /* register this driver with the USB subsystem */
2547         result = usb_register(&gigaset_usb_driver);
2548         if (result < 0) {
2549                 pr_err("error %d registering USB driver\n", -result);
2550                 goto error;
2551         }
2552
2553         pr_info(DRIVER_DESC "\n");
2554         return 0;
2555
2556 error:
2557         if (driver)
2558                 gigaset_freedriver(driver);
2559         driver = NULL;
2560         return -1;
2561 }
2562
2563 /* bas_gigaset_exit
2564  * This function is called before the kernel module is unloaded.
2565  */
2566 static void __exit bas_gigaset_exit(void)
2567 {
2568         struct bas_cardstate *ucs;
2569         int i;
2570
2571         gigaset_blockdriver(driver); /* => probe will fail
2572                                       * => no gigaset_start any more
2573                                       */
2574
2575         /* stop all connected devices */
2576         for (i = 0; i < driver->minors; i++) {
2577                 if (gigaset_shutdown(driver->cs + i) < 0)
2578                         continue;               /* no device */
2579                 /* from now on, no isdn callback should be possible */
2580
2581                 /* close all still open channels */
2582                 ucs = driver->cs[i].hw.bas;
2583                 if (ucs->basstate & BS_B1OPEN) {
2584                         gig_dbg(DEBUG_INIT, "closing B1 channel");
2585                         usb_control_msg(ucs->udev,
2586                                         usb_sndctrlpipe(ucs->udev, 0),
2587                                         HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
2588                                         0, 0, NULL, 0, BAS_TIMEOUT);
2589                 }
2590                 if (ucs->basstate & BS_B2OPEN) {
2591                         gig_dbg(DEBUG_INIT, "closing B2 channel");
2592                         usb_control_msg(ucs->udev,
2593                                         usb_sndctrlpipe(ucs->udev, 0),
2594                                         HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
2595                                         0, 0, NULL, 0, BAS_TIMEOUT);
2596                 }
2597                 if (ucs->basstate & BS_ATOPEN) {
2598                         gig_dbg(DEBUG_INIT, "closing AT channel");
2599                         usb_control_msg(ucs->udev,
2600                                         usb_sndctrlpipe(ucs->udev, 0),
2601                                         HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
2602                                         0, 0, NULL, 0, BAS_TIMEOUT);
2603                 }
2604                 ucs->basstate = 0;
2605         }
2606
2607         /* deregister this driver with the USB subsystem */
2608         usb_deregister(&gigaset_usb_driver);
2609         /* this will call the disconnect-callback */
2610         /* from now on, no disconnect/probe callback should be running */
2611
2612         gigaset_freedriver(driver);
2613         driver = NULL;
2614 }
2615
2616
2617 module_init(bas_gigaset_init);
2618 module_exit(bas_gigaset_exit);
2619
2620 MODULE_AUTHOR(DRIVER_AUTHOR);
2621 MODULE_DESCRIPTION(DRIVER_DESC);
2622 MODULE_LICENSE("GPL");