linux/drivers/isdn/gigaset/bas-gigaset.c
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   1/*
   2 * USB driver for Gigaset 307x base via direct USB connection.
   3 *
   4 * Copyright (c) 2001 by Hansjoerg Lipp <hjlipp@web.de>,
   5 *                       Tilman Schmidt <tilman@imap.cc>,
   6 *                       Stefan Eilers.
   7 *
   8 * =====================================================================
   9 *      This program is free software; you can redistribute it and/or
  10 *      modify it under the terms of the GNU General Public License as
  11 *      published by the Free Software Foundation; either version 2 of
  12 *      the License, or (at your option) any later version.
  13 * =====================================================================
  14 */
  15
  16#include "gigaset.h"
  17#include <linux/usb.h>
  18#include <linux/module.h>
  19#include <linux/moduleparam.h>
  20
  21/* Version Information */
  22#define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
  23#define DRIVER_DESC "USB Driver for Gigaset 307x"
  24
  25
  26/* Module parameters */
  27
  28static int startmode = SM_ISDN;
  29static int cidmode = 1;
  30
  31module_param(startmode, int, S_IRUGO);
  32module_param(cidmode, int, S_IRUGO);
  33MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
  34MODULE_PARM_DESC(cidmode, "Call-ID mode");
  35
  36#define GIGASET_MINORS     1
  37#define GIGASET_MINOR      16
  38#define GIGASET_MODULENAME "bas_gigaset"
  39#define GIGASET_DEVNAME    "ttyGB"
  40
  41/* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
  42#define IF_WRITEBUF 264
  43
  44/* interrupt pipe message size according to ibid. ch. 2.2 */
  45#define IP_MSGSIZE 3
  46
  47/* Values for the Gigaset 307x */
  48#define USB_GIGA_VENDOR_ID      0x0681
  49#define USB_3070_PRODUCT_ID     0x0001
  50#define USB_3075_PRODUCT_ID     0x0002
  51#define USB_SX303_PRODUCT_ID    0x0021
  52#define USB_SX353_PRODUCT_ID    0x0022
  53
  54/* table of devices that work with this driver */
  55static const struct usb_device_id gigaset_table[] = {
  56        { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3070_PRODUCT_ID) },
  57        { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3075_PRODUCT_ID) },
  58        { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX303_PRODUCT_ID) },
  59        { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX353_PRODUCT_ID) },
  60        { } /* Terminating entry */
  61};
  62
  63MODULE_DEVICE_TABLE(usb, gigaset_table);
  64
  65/*======================= local function prototypes ==========================*/
  66
  67/* function called if a new device belonging to this driver is connected */
  68static int gigaset_probe(struct usb_interface *interface,
  69                         const struct usb_device_id *id);
  70
  71/* Function will be called if the device is unplugged */
  72static void gigaset_disconnect(struct usb_interface *interface);
  73
  74/* functions called before/after suspend */
  75static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
  76static int gigaset_resume(struct usb_interface *intf);
  77
  78/* functions called before/after device reset */
  79static int gigaset_pre_reset(struct usb_interface *intf);
  80static int gigaset_post_reset(struct usb_interface *intf);
  81
  82static int atread_submit(struct cardstate *, int);
  83static void stopurbs(struct bas_bc_state *);
  84static int req_submit(struct bc_state *, int, int, int);
  85static int atwrite_submit(struct cardstate *, unsigned char *, int);
  86static int start_cbsend(struct cardstate *);
  87
  88/*============================================================================*/
  89
  90struct bas_cardstate {
  91        struct usb_device       *udev;          /* USB device pointer */
  92        struct usb_interface    *interface;     /* interface for this device */
  93        unsigned char           minor;          /* starting minor number */
  94
  95        struct urb              *urb_ctrl;      /* control pipe default URB */
  96        struct usb_ctrlrequest  dr_ctrl;
  97        struct timer_list       timer_ctrl;     /* control request timeout */
  98        int                     retry_ctrl;
  99
 100        struct timer_list       timer_atrdy;    /* AT command ready timeout */
 101        struct urb              *urb_cmd_out;   /* for sending AT commands */
 102        struct usb_ctrlrequest  dr_cmd_out;
 103        int                     retry_cmd_out;
 104
 105        struct urb              *urb_cmd_in;    /* for receiving AT replies */
 106        struct usb_ctrlrequest  dr_cmd_in;
 107        struct timer_list       timer_cmd_in;   /* receive request timeout */
 108        unsigned char           *rcvbuf;        /* AT reply receive buffer */
 109
 110        struct urb              *urb_int_in;    /* URB for interrupt pipe */
 111        unsigned char           *int_in_buf;
 112        struct work_struct      int_in_wq;      /* for usb_clear_halt() */
 113        struct timer_list       timer_int_in;   /* int read retry delay */
 114        int                     retry_int_in;
 115
 116        spinlock_t              lock;           /* locks all following */
 117        int                     basstate;       /* bitmap (BS_*) */
 118        int                     pending;        /* uncompleted base request */
 119        wait_queue_head_t       waitqueue;
 120        int                     rcvbuf_size;    /* size of AT receive buffer */
 121                                                /* 0: no receive in progress */
 122        int                     retry_cmd_in;   /* receive req retry count */
 123};
 124
 125/* status of direct USB connection to 307x base (bits in basstate) */
 126#define BS_ATOPEN       0x001   /* AT channel open */
 127#define BS_B1OPEN       0x002   /* B channel 1 open */
 128#define BS_B2OPEN       0x004   /* B channel 2 open */
 129#define BS_ATREADY      0x008   /* base ready for AT command */
 130#define BS_INIT         0x010   /* base has signalled INIT_OK */
 131#define BS_ATTIMER      0x020   /* waiting for HD_READY_SEND_ATDATA */
 132#define BS_ATRDPEND     0x040   /* urb_cmd_in in use */
 133#define BS_ATWRPEND     0x080   /* urb_cmd_out in use */
 134#define BS_SUSPEND      0x100   /* USB port suspended */
 135#define BS_RESETTING    0x200   /* waiting for HD_RESET_INTERRUPT_PIPE_ACK */
 136
 137
 138static struct gigaset_driver *driver;
 139
 140/* usb specific object needed to register this driver with the usb subsystem */
 141static struct usb_driver gigaset_usb_driver = {
 142        .name =         GIGASET_MODULENAME,
 143        .probe =        gigaset_probe,
 144        .disconnect =   gigaset_disconnect,
 145        .id_table =     gigaset_table,
 146        .suspend =      gigaset_suspend,
 147        .resume =       gigaset_resume,
 148        .reset_resume = gigaset_post_reset,
 149        .pre_reset =    gigaset_pre_reset,
 150        .post_reset =   gigaset_post_reset,
 151        .disable_hub_initiated_lpm = 1,
 152};
 153
 154/* get message text for usb_submit_urb return code
 155 */
 156static char *get_usb_rcmsg(int rc)
 157{
 158        static char unkmsg[28];
 159
 160        switch (rc) {
 161        case 0:
 162                return "success";
 163        case -ENOMEM:
 164                return "out of memory";
 165        case -ENODEV:
 166                return "device not present";
 167        case -ENOENT:
 168                return "endpoint not present";
 169        case -ENXIO:
 170                return "URB type not supported";
 171        case -EINVAL:
 172                return "invalid argument";
 173        case -EAGAIN:
 174                return "start frame too early or too much scheduled";
 175        case -EFBIG:
 176                return "too many isoc frames requested";
 177        case -EPIPE:
 178                return "endpoint stalled";
 179        case -EMSGSIZE:
 180                return "invalid packet size";
 181        case -ENOSPC:
 182                return "would overcommit USB bandwidth";
 183        case -ESHUTDOWN:
 184                return "device shut down";
 185        case -EPERM:
 186                return "reject flag set";
 187        case -EHOSTUNREACH:
 188                return "device suspended";
 189        default:
 190                snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
 191                return unkmsg;
 192        }
 193}
 194
 195/* get message text for USB status code
 196 */
 197static char *get_usb_statmsg(int status)
 198{
 199        static char unkmsg[28];
 200
 201        switch (status) {
 202        case 0:
 203                return "success";
 204        case -ENOENT:
 205                return "unlinked (sync)";
 206        case -EINPROGRESS:
 207                return "URB still pending";
 208        case -EPROTO:
 209                return "bitstuff error, timeout, or unknown USB error";
 210        case -EILSEQ:
 211                return "CRC mismatch, timeout, or unknown USB error";
 212        case -ETIME:
 213                return "USB response timeout";
 214        case -EPIPE:
 215                return "endpoint stalled";
 216        case -ECOMM:
 217                return "IN buffer overrun";
 218        case -ENOSR:
 219                return "OUT buffer underrun";
 220        case -EOVERFLOW:
 221                return "endpoint babble";
 222        case -EREMOTEIO:
 223                return "short packet";
 224        case -ENODEV:
 225                return "device removed";
 226        case -EXDEV:
 227                return "partial isoc transfer";
 228        case -EINVAL:
 229                return "ISO madness";
 230        case -ECONNRESET:
 231                return "unlinked (async)";
 232        case -ESHUTDOWN:
 233                return "device shut down";
 234        default:
 235                snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
 236                return unkmsg;
 237        }
 238}
 239
 240/* usb_pipetype_str
 241 * retrieve string representation of USB pipe type
 242 */
 243static inline char *usb_pipetype_str(int pipe)
 244{
 245        if (usb_pipeisoc(pipe))
 246                return "Isoc";
 247        if (usb_pipeint(pipe))
 248                return "Int";
 249        if (usb_pipecontrol(pipe))
 250                return "Ctrl";
 251        if (usb_pipebulk(pipe))
 252                return "Bulk";
 253        return "?";
 254}
 255
 256/* dump_urb
 257 * write content of URB to syslog for debugging
 258 */
 259static inline void dump_urb(enum debuglevel level, const char *tag,
 260                            struct urb *urb)
 261{
 262#ifdef CONFIG_GIGASET_DEBUG
 263        int i;
 264        gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
 265        if (urb) {
 266                gig_dbg(level,
 267                        "  dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
 268                        "hcpriv=0x%08lx, transfer_flags=0x%x,",
 269                        (unsigned long) urb->dev,
 270                        usb_pipetype_str(urb->pipe),
 271                        usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
 272                        usb_pipein(urb->pipe) ? "in" : "out",
 273                        (unsigned long) urb->hcpriv,
 274                        urb->transfer_flags);
 275                gig_dbg(level,
 276                        "  transfer_buffer=0x%08lx[%d], actual_length=%d, "
 277                        "setup_packet=0x%08lx,",
 278                        (unsigned long) urb->transfer_buffer,
 279                        urb->transfer_buffer_length, urb->actual_length,
 280                        (unsigned long) urb->setup_packet);
 281                gig_dbg(level,
 282                        "  start_frame=%d, number_of_packets=%d, interval=%d, "
 283                        "error_count=%d,",
 284                        urb->start_frame, urb->number_of_packets, urb->interval,
 285                        urb->error_count);
 286                gig_dbg(level,
 287                        "  context=0x%08lx, complete=0x%08lx, "
 288                        "iso_frame_desc[]={",
 289                        (unsigned long) urb->context,
 290                        (unsigned long) urb->complete);
 291                for (i = 0; i < urb->number_of_packets; i++) {
 292                        struct usb_iso_packet_descriptor *pifd
 293                                = &urb->iso_frame_desc[i];
 294                        gig_dbg(level,
 295                                "    {offset=%u, length=%u, actual_length=%u, "
 296                                "status=%u}",
 297                                pifd->offset, pifd->length, pifd->actual_length,
 298                                pifd->status);
 299                }
 300        }
 301        gig_dbg(level, "}}");
 302#endif
 303}
 304
 305/* read/set modem control bits etc. (m10x only) */
 306static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
 307                                  unsigned new_state)
 308{
 309        return -EINVAL;
 310}
 311
 312static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
 313{
 314        return -EINVAL;
 315}
 316
 317static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
 318{
 319        return -EINVAL;
 320}
 321
 322/* set/clear bits in base connection state, return previous state
 323 */
 324static inline int update_basstate(struct bas_cardstate *ucs,
 325                                  int set, int clear)
 326{
 327        unsigned long flags;
 328        int state;
 329
 330        spin_lock_irqsave(&ucs->lock, flags);
 331        state = ucs->basstate;
 332        ucs->basstate = (state & ~clear) | set;
 333        spin_unlock_irqrestore(&ucs->lock, flags);
 334        return state;
 335}
 336
 337/* error_hangup
 338 * hang up any existing connection because of an unrecoverable error
 339 * This function may be called from any context and takes care of scheduling
 340 * the necessary actions for execution outside of interrupt context.
 341 * cs->lock must not be held.
 342 * argument:
 343 *      B channel control structure
 344 */
 345static inline void error_hangup(struct bc_state *bcs)
 346{
 347        struct cardstate *cs = bcs->cs;
 348
 349        gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL);
 350        gigaset_schedule_event(cs);
 351}
 352
 353/* error_reset
 354 * reset Gigaset device because of an unrecoverable error
 355 * This function may be called from any context, and takes care of
 356 * scheduling the necessary actions for execution outside of interrupt context.
 357 * cs->hw.bas->lock must not be held.
 358 * argument:
 359 *      controller state structure
 360 */
 361static inline void error_reset(struct cardstate *cs)
 362{
 363        /* reset interrupt pipe to recover (ignore errors) */
 364        update_basstate(cs->hw.bas, BS_RESETTING, 0);
 365        if (req_submit(cs->bcs, HD_RESET_INTERRUPT_PIPE, 0, BAS_TIMEOUT))
 366                /* submission failed, escalate to USB port reset */
 367                usb_queue_reset_device(cs->hw.bas->interface);
 368}
 369
 370/* check_pending
 371 * check for completion of pending control request
 372 * parameter:
 373 *      ucs     hardware specific controller state structure
 374 */
 375static void check_pending(struct bas_cardstate *ucs)
 376{
 377        unsigned long flags;
 378
 379        spin_lock_irqsave(&ucs->lock, flags);
 380        switch (ucs->pending) {
 381        case 0:
 382                break;
 383        case HD_OPEN_ATCHANNEL:
 384                if (ucs->basstate & BS_ATOPEN)
 385                        ucs->pending = 0;
 386                break;
 387        case HD_OPEN_B1CHANNEL:
 388                if (ucs->basstate & BS_B1OPEN)
 389                        ucs->pending = 0;
 390                break;
 391        case HD_OPEN_B2CHANNEL:
 392                if (ucs->basstate & BS_B2OPEN)
 393                        ucs->pending = 0;
 394                break;
 395        case HD_CLOSE_ATCHANNEL:
 396                if (!(ucs->basstate & BS_ATOPEN))
 397                        ucs->pending = 0;
 398                break;
 399        case HD_CLOSE_B1CHANNEL:
 400                if (!(ucs->basstate & BS_B1OPEN))
 401                        ucs->pending = 0;
 402                break;
 403        case HD_CLOSE_B2CHANNEL:
 404                if (!(ucs->basstate & BS_B2OPEN))
 405                        ucs->pending = 0;
 406                break;
 407        case HD_DEVICE_INIT_ACK:                /* no reply expected */
 408                ucs->pending = 0;
 409                break;
 410        case HD_RESET_INTERRUPT_PIPE:
 411                if (!(ucs->basstate & BS_RESETTING))
 412                        ucs->pending = 0;
 413                break;
 414        /*
 415         * HD_READ_ATMESSAGE and HD_WRITE_ATMESSAGE are handled separately
 416         * and should never end up here
 417         */
 418        default:
 419                dev_warn(&ucs->interface->dev,
 420                         "unknown pending request 0x%02x cleared\n",
 421                         ucs->pending);
 422                ucs->pending = 0;
 423        }
 424
 425        if (!ucs->pending)
 426                del_timer(&ucs->timer_ctrl);
 427
 428        spin_unlock_irqrestore(&ucs->lock, flags);
 429}
 430
 431/* cmd_in_timeout
 432 * timeout routine for command input request
 433 * argument:
 434 *      controller state structure
 435 */
 436static void cmd_in_timeout(unsigned long data)
 437{
 438        struct cardstate *cs = (struct cardstate *) data;
 439        struct bas_cardstate *ucs = cs->hw.bas;
 440        int rc;
 441
 442        if (!ucs->rcvbuf_size) {
 443                gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
 444                return;
 445        }
 446
 447        if (ucs->retry_cmd_in++ >= BAS_RETRY) {
 448                dev_err(cs->dev,
 449                        "control read: timeout, giving up after %d tries\n",
 450                        ucs->retry_cmd_in);
 451                kfree(ucs->rcvbuf);
 452                ucs->rcvbuf = NULL;
 453                ucs->rcvbuf_size = 0;
 454                error_reset(cs);
 455                return;
 456        }
 457
 458        gig_dbg(DEBUG_USBREQ, "%s: timeout, retry %d",
 459                __func__, ucs->retry_cmd_in);
 460        rc = atread_submit(cs, BAS_TIMEOUT);
 461        if (rc < 0) {
 462                kfree(ucs->rcvbuf);
 463                ucs->rcvbuf = NULL;
 464                ucs->rcvbuf_size = 0;
 465                if (rc != -ENODEV)
 466                        error_reset(cs);
 467        }
 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 */
 477static 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        unsigned numbytes;
 484        int rc;
 485
 486        update_basstate(ucs, 0, BS_ATRDPEND);
 487        wake_up(&ucs->waitqueue);
 488        del_timer(&ucs->timer_cmd_in);
 489
 490        switch (status) {
 491        case 0:                         /* normal completion */
 492                numbytes = urb->actual_length;
 493                if (unlikely(numbytes != ucs->rcvbuf_size)) {
 494                        dev_warn(cs->dev,
 495                                 "control read: received %d chars, expected %d\n",
 496                                 numbytes, ucs->rcvbuf_size);
 497                        if (numbytes > ucs->rcvbuf_size)
 498                                numbytes = ucs->rcvbuf_size;
 499                }
 500
 501                /* copy received bytes to inbuf, notify event layer */
 502                if (gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes)) {
 503                        gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
 504                        gigaset_schedule_event(cs);
 505                }
 506                break;
 507
 508        case -ENOENT:                   /* cancelled */
 509        case -ECONNRESET:               /* cancelled (async) */
 510        case -EINPROGRESS:              /* pending */
 511        case -ENODEV:                   /* device removed */
 512        case -ESHUTDOWN:                /* device shut down */
 513                /* no further action necessary */
 514                gig_dbg(DEBUG_USBREQ, "%s: %s",
 515                        __func__, get_usb_statmsg(status));
 516                break;
 517
 518        default:                        /* other errors: retry */
 519                if (ucs->retry_cmd_in++ < BAS_RETRY) {
 520                        gig_dbg(DEBUG_USBREQ, "%s: %s, retry %d", __func__,
 521                                get_usb_statmsg(status), ucs->retry_cmd_in);
 522                        rc = atread_submit(cs, BAS_TIMEOUT);
 523                        if (rc >= 0)
 524                                /* successfully resubmitted, skip freeing */
 525                                return;
 526                        if (rc == -ENODEV)
 527                                /* disconnect, no further action necessary */
 528                                break;
 529                }
 530                dev_err(cs->dev, "control read: %s, giving up after %d tries\n",
 531                        get_usb_statmsg(status), ucs->retry_cmd_in);
 532                error_reset(cs);
 533        }
 534
 535        /* read finished, free buffer */
 536        kfree(ucs->rcvbuf);
 537        ucs->rcvbuf = NULL;
 538        ucs->rcvbuf_size = 0;
 539}
 540
 541/* atread_submit
 542 * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
 543 * parameters:
 544 *      cs      controller state structure
 545 *      timeout timeout in 1/10 sec., 0: none
 546 * return value:
 547 *      0 on success
 548 *      -EBUSY if another request is pending
 549 *      any URB submission error code
 550 */
 551static int atread_submit(struct cardstate *cs, int timeout)
 552{
 553        struct bas_cardstate *ucs = cs->hw.bas;
 554        int basstate;
 555        int ret;
 556
 557        gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
 558                ucs->rcvbuf_size);
 559
 560        basstate = update_basstate(ucs, BS_ATRDPEND, 0);
 561        if (basstate & BS_ATRDPEND) {
 562                dev_err(cs->dev,
 563                        "could not submit HD_READ_ATMESSAGE: URB busy\n");
 564                return -EBUSY;
 565        }
 566
 567        if (basstate & BS_SUSPEND) {
 568                dev_notice(cs->dev,
 569                           "HD_READ_ATMESSAGE not submitted, "
 570                           "suspend in progress\n");
 571                update_basstate(ucs, 0, BS_ATRDPEND);
 572                /* treat like disconnect */
 573                return -ENODEV;
 574        }
 575
 576        ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
 577        ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
 578        ucs->dr_cmd_in.wValue = 0;
 579        ucs->dr_cmd_in.wIndex = 0;
 580        ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
 581        usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
 582                             usb_rcvctrlpipe(ucs->udev, 0),
 583                             (unsigned char *) &ucs->dr_cmd_in,
 584                             ucs->rcvbuf, ucs->rcvbuf_size,
 585                             read_ctrl_callback, cs->inbuf);
 586
 587        ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC);
 588        if (ret != 0) {
 589                update_basstate(ucs, 0, BS_ATRDPEND);
 590                dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
 591                        get_usb_rcmsg(ret));
 592                return ret;
 593        }
 594
 595        if (timeout > 0) {
 596                gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
 597                mod_timer(&ucs->timer_cmd_in, jiffies + timeout * HZ / 10);
 598        }
 599        return 0;
 600}
 601
 602/* int_in_work
 603 * workqueue routine to clear halt on interrupt in endpoint
 604 */
 605
 606static void int_in_work(struct work_struct *work)
 607{
 608        struct bas_cardstate *ucs =
 609                container_of(work, struct bas_cardstate, int_in_wq);
 610        struct urb *urb = ucs->urb_int_in;
 611        struct cardstate *cs = urb->context;
 612        int rc;
 613
 614        /* clear halt condition */
 615        rc = usb_clear_halt(ucs->udev, urb->pipe);
 616        gig_dbg(DEBUG_USBREQ, "clear_halt: %s", get_usb_rcmsg(rc));
 617        if (rc == 0)
 618                /* success, resubmit interrupt read URB */
 619                rc = usb_submit_urb(urb, GFP_ATOMIC);
 620
 621        switch (rc) {
 622        case 0:         /* success */
 623        case -ENODEV:   /* device gone */
 624        case -EINVAL:   /* URB already resubmitted, or terminal badness */
 625                break;
 626        default:        /* failure: try to recover by resetting the device */
 627                dev_err(cs->dev, "clear halt failed: %s\n", get_usb_rcmsg(rc));
 628                rc = usb_lock_device_for_reset(ucs->udev, ucs->interface);
 629                if (rc == 0) {
 630                        rc = usb_reset_device(ucs->udev);
 631                        usb_unlock_device(ucs->udev);
 632                }
 633        }
 634        ucs->retry_int_in = 0;
 635}
 636
 637/* int_in_resubmit
 638 * timer routine for interrupt read delayed resubmit
 639 * argument:
 640 *      controller state structure
 641 */
 642static void int_in_resubmit(unsigned long data)
 643{
 644        struct cardstate *cs = (struct cardstate *) data;
 645        struct bas_cardstate *ucs = cs->hw.bas;
 646        int rc;
 647
 648        if (ucs->retry_int_in++ >= BAS_RETRY) {
 649                dev_err(cs->dev, "interrupt read: giving up after %d tries\n",
 650                        ucs->retry_int_in);
 651                usb_queue_reset_device(ucs->interface);
 652                return;
 653        }
 654
 655        gig_dbg(DEBUG_USBREQ, "%s: retry %d", __func__, ucs->retry_int_in);
 656        rc = usb_submit_urb(ucs->urb_int_in, GFP_ATOMIC);
 657        if (rc != 0 && rc != -ENODEV) {
 658                dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
 659                        get_usb_rcmsg(rc));
 660                usb_queue_reset_device(ucs->interface);
 661        }
 662}
 663
 664/* read_int_callback
 665 * USB completion handler for interrupt pipe input
 666 * called by the USB subsystem in interrupt context
 667 * parameter:
 668 *      urb     USB request block
 669 *              urb->context = controller state structure
 670 */
 671static void read_int_callback(struct urb *urb)
 672{
 673        struct cardstate *cs = urb->context;
 674        struct bas_cardstate *ucs = cs->hw.bas;
 675        struct bc_state *bcs;
 676        int status = urb->status;
 677        unsigned long flags;
 678        int rc;
 679        unsigned l;
 680        int channel;
 681
 682        switch (status) {
 683        case 0:                 /* success */
 684                ucs->retry_int_in = 0;
 685                break;
 686        case -EPIPE:                    /* endpoint stalled */
 687                schedule_work(&ucs->int_in_wq);
 688                /* fall through */
 689        case -ENOENT:                   /* cancelled */
 690        case -ECONNRESET:               /* cancelled (async) */
 691        case -EINPROGRESS:              /* pending */
 692        case -ENODEV:                   /* device removed */
 693        case -ESHUTDOWN:                /* device shut down */
 694                /* no further action necessary */
 695                gig_dbg(DEBUG_USBREQ, "%s: %s",
 696                        __func__, get_usb_statmsg(status));
 697                return;
 698        case -EPROTO:                   /* protocol error or unplug */
 699        case -EILSEQ:
 700        case -ETIME:
 701                /* resubmit after delay */
 702                gig_dbg(DEBUG_USBREQ, "%s: %s",
 703                        __func__, get_usb_statmsg(status));
 704                mod_timer(&ucs->timer_int_in, jiffies + HZ / 10);
 705                return;
 706        default:                /* other errors: just resubmit */
 707                dev_warn(cs->dev, "interrupt read: %s\n",
 708                         get_usb_statmsg(status));
 709                goto resubmit;
 710        }
 711
 712        /* drop incomplete packets even if the missing bytes wouldn't matter */
 713        if (unlikely(urb->actual_length < IP_MSGSIZE)) {
 714                dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
 715                         urb->actual_length);
 716                goto resubmit;
 717        }
 718
 719        l = (unsigned) ucs->int_in_buf[1] +
 720                (((unsigned) ucs->int_in_buf[2]) << 8);
 721
 722        gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
 723                urb->actual_length, (int)ucs->int_in_buf[0], l,
 724                (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
 725
 726        channel = 0;
 727
 728        switch (ucs->int_in_buf[0]) {
 729        case HD_DEVICE_INIT_OK:
 730                update_basstate(ucs, BS_INIT, 0);
 731                break;
 732
 733        case HD_READY_SEND_ATDATA:
 734                del_timer(&ucs->timer_atrdy);
 735                update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
 736                start_cbsend(cs);
 737                break;
 738
 739        case HD_OPEN_B2CHANNEL_ACK:
 740                ++channel;
 741        case HD_OPEN_B1CHANNEL_ACK:
 742                bcs = cs->bcs + channel;
 743                update_basstate(ucs, BS_B1OPEN << channel, 0);
 744                gigaset_bchannel_up(bcs);
 745                break;
 746
 747        case HD_OPEN_ATCHANNEL_ACK:
 748                update_basstate(ucs, BS_ATOPEN, 0);
 749                start_cbsend(cs);
 750                break;
 751
 752        case HD_CLOSE_B2CHANNEL_ACK:
 753                ++channel;
 754        case HD_CLOSE_B1CHANNEL_ACK:
 755                bcs = cs->bcs + channel;
 756                update_basstate(ucs, 0, BS_B1OPEN << channel);
 757                stopurbs(bcs->hw.bas);
 758                gigaset_bchannel_down(bcs);
 759                break;
 760
 761        case HD_CLOSE_ATCHANNEL_ACK:
 762                update_basstate(ucs, 0, BS_ATOPEN);
 763                break;
 764
 765        case HD_B2_FLOW_CONTROL:
 766                ++channel;
 767        case HD_B1_FLOW_CONTROL:
 768                bcs = cs->bcs + channel;
 769                atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
 770                           &bcs->hw.bas->corrbytes);
 771                gig_dbg(DEBUG_ISO,
 772                        "Flow control (channel %d, sub %d): 0x%02x => %d",
 773                        channel, bcs->hw.bas->numsub, l,
 774                        atomic_read(&bcs->hw.bas->corrbytes));
 775                break;
 776
 777        case HD_RECEIVEATDATA_ACK:      /* AT response ready to be received */
 778                if (!l) {
 779                        dev_warn(cs->dev,
 780                                 "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
 781                        break;
 782                }
 783                spin_lock_irqsave(&cs->lock, flags);
 784                if (ucs->basstate & BS_ATRDPEND) {
 785                        spin_unlock_irqrestore(&cs->lock, flags);
 786                        dev_warn(cs->dev,
 787                                 "HD_RECEIVEATDATA_ACK(%d) during HD_READ_ATMESSAGE(%d) ignored\n",
 788                                 l, ucs->rcvbuf_size);
 789                        break;
 790                }
 791                if (ucs->rcvbuf_size) {
 792                        /* throw away previous buffer - we have no queue */
 793                        dev_err(cs->dev,
 794                                "receive AT data overrun, %d bytes lost\n",
 795                                ucs->rcvbuf_size);
 796                        kfree(ucs->rcvbuf);
 797                        ucs->rcvbuf_size = 0;
 798                }
 799                ucs->rcvbuf = kmalloc(l, GFP_ATOMIC);
 800                if (ucs->rcvbuf == NULL) {
 801                        spin_unlock_irqrestore(&cs->lock, flags);
 802                        dev_err(cs->dev, "out of memory receiving AT data\n");
 803                        break;
 804                }
 805                ucs->rcvbuf_size = l;
 806                ucs->retry_cmd_in = 0;
 807                rc = atread_submit(cs, BAS_TIMEOUT);
 808                if (rc < 0) {
 809                        kfree(ucs->rcvbuf);
 810                        ucs->rcvbuf = NULL;
 811                        ucs->rcvbuf_size = 0;
 812                }
 813                spin_unlock_irqrestore(&cs->lock, flags);
 814                if (rc < 0 && rc != -ENODEV)
 815                        error_reset(cs);
 816                break;
 817
 818        case HD_RESET_INTERRUPT_PIPE_ACK:
 819                update_basstate(ucs, 0, BS_RESETTING);
 820                dev_notice(cs->dev, "interrupt pipe reset\n");
 821                break;
 822
 823        case HD_SUSPEND_END:
 824                gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
 825                break;
 826
 827        default:
 828                dev_warn(cs->dev,
 829                         "unknown Gigaset signal 0x%02x (%u) ignored\n",
 830                         (int) ucs->int_in_buf[0], l);
 831        }
 832
 833        check_pending(ucs);
 834        wake_up(&ucs->waitqueue);
 835
 836resubmit:
 837        rc = usb_submit_urb(urb, GFP_ATOMIC);
 838        if (unlikely(rc != 0 && rc != -ENODEV)) {
 839                dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
 840                        get_usb_rcmsg(rc));
 841                error_reset(cs);
 842        }
 843}
 844
 845/* read_iso_callback
 846 * USB completion handler for B channel isochronous input
 847 * called by the USB subsystem in interrupt context
 848 * parameter:
 849 *      urb     USB request block of completed request
 850 *              urb->context = bc_state structure
 851 */
 852static void read_iso_callback(struct urb *urb)
 853{
 854        struct bc_state *bcs;
 855        struct bas_bc_state *ubc;
 856        int status = urb->status;
 857        unsigned long flags;
 858        int i, rc;
 859
 860        /* status codes not worth bothering the tasklet with */
 861        if (unlikely(status == -ENOENT ||
 862                     status == -ECONNRESET ||
 863                     status == -EINPROGRESS ||
 864                     status == -ENODEV ||
 865                     status == -ESHUTDOWN)) {
 866                gig_dbg(DEBUG_ISO, "%s: %s",
 867                        __func__, get_usb_statmsg(status));
 868                return;
 869        }
 870
 871        bcs = urb->context;
 872        ubc = bcs->hw.bas;
 873
 874        spin_lock_irqsave(&ubc->isoinlock, flags);
 875        if (likely(ubc->isoindone == NULL)) {
 876                /* pass URB to tasklet */
 877                ubc->isoindone = urb;
 878                ubc->isoinstatus = status;
 879                tasklet_hi_schedule(&ubc->rcvd_tasklet);
 880        } else {
 881                /* tasklet still busy, drop data and resubmit URB */
 882                gig_dbg(DEBUG_ISO, "%s: overrun", __func__);
 883                ubc->loststatus = status;
 884                for (i = 0; i < BAS_NUMFRAMES; i++) {
 885                        ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
 886                        if (unlikely(urb->iso_frame_desc[i].status != 0 &&
 887                                     urb->iso_frame_desc[i].status != -EINPROGRESS))
 888                                ubc->loststatus = urb->iso_frame_desc[i].status;
 889                        urb->iso_frame_desc[i].status = 0;
 890                        urb->iso_frame_desc[i].actual_length = 0;
 891                }
 892                if (likely(ubc->running)) {
 893                        /* urb->dev is clobbered by USB subsystem */
 894                        urb->dev = bcs->cs->hw.bas->udev;
 895                        urb->transfer_flags = URB_ISO_ASAP;
 896                        urb->number_of_packets = BAS_NUMFRAMES;
 897                        rc = usb_submit_urb(urb, GFP_ATOMIC);
 898                        if (unlikely(rc != 0 && rc != -ENODEV)) {
 899                                dev_err(bcs->cs->dev,
 900                                        "could not resubmit isoc read URB: %s\n",
 901                                        get_usb_rcmsg(rc));
 902                                dump_urb(DEBUG_ISO, "isoc read", urb);
 903                                error_hangup(bcs);
 904                        }
 905                }
 906        }
 907        spin_unlock_irqrestore(&ubc->isoinlock, flags);
 908}
 909
 910/* write_iso_callback
 911 * USB completion handler for B channel isochronous output
 912 * called by the USB subsystem in interrupt context
 913 * parameter:
 914 *      urb     USB request block of completed request
 915 *              urb->context = isow_urbctx_t structure
 916 */
 917static void write_iso_callback(struct urb *urb)
 918{
 919        struct isow_urbctx_t *ucx;
 920        struct bas_bc_state *ubc;
 921        int status = urb->status;
 922        unsigned long flags;
 923
 924        /* status codes not worth bothering the tasklet with */
 925        if (unlikely(status == -ENOENT ||
 926                     status == -ECONNRESET ||
 927                     status == -EINPROGRESS ||
 928                     status == -ENODEV ||
 929                     status == -ESHUTDOWN)) {
 930                gig_dbg(DEBUG_ISO, "%s: %s",
 931                        __func__, get_usb_statmsg(status));
 932                return;
 933        }
 934
 935        /* pass URB context to tasklet */
 936        ucx = urb->context;
 937        ubc = ucx->bcs->hw.bas;
 938        ucx->status = status;
 939
 940        spin_lock_irqsave(&ubc->isooutlock, flags);
 941        ubc->isooutovfl = ubc->isooutdone;
 942        ubc->isooutdone = ucx;
 943        spin_unlock_irqrestore(&ubc->isooutlock, flags);
 944        tasklet_hi_schedule(&ubc->sent_tasklet);
 945}
 946
 947/* starturbs
 948 * prepare and submit USB request blocks for isochronous input and output
 949 * argument:
 950 *      B channel control structure
 951 * return value:
 952 *      0 on success
 953 *      < 0 on error (no URBs submitted)
 954 */
 955static int starturbs(struct bc_state *bcs)
 956{
 957        struct bas_bc_state *ubc = bcs->hw.bas;
 958        struct urb *urb;
 959        int j, k;
 960        int rc;
 961
 962        /* initialize L2 reception */
 963        if (bcs->proto2 == L2_HDLC)
 964                bcs->inputstate |= INS_flag_hunt;
 965
 966        /* submit all isochronous input URBs */
 967        ubc->running = 1;
 968        for (k = 0; k < BAS_INURBS; k++) {
 969                urb = ubc->isoinurbs[k];
 970                if (!urb) {
 971                        rc = -EFAULT;
 972                        goto error;
 973                }
 974
 975                urb->dev = bcs->cs->hw.bas->udev;
 976                urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
 977                urb->transfer_flags = URB_ISO_ASAP;
 978                urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
 979                urb->transfer_buffer_length = BAS_INBUFSIZE;
 980                urb->number_of_packets = BAS_NUMFRAMES;
 981                urb->interval = BAS_FRAMETIME;
 982                urb->complete = read_iso_callback;
 983                urb->context = bcs;
 984                for (j = 0; j < BAS_NUMFRAMES; j++) {
 985                        urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
 986                        urb->iso_frame_desc[j].length = BAS_MAXFRAME;
 987                        urb->iso_frame_desc[j].status = 0;
 988                        urb->iso_frame_desc[j].actual_length = 0;
 989                }
 990
 991                dump_urb(DEBUG_ISO, "Initial isoc read", urb);
 992                rc = usb_submit_urb(urb, GFP_ATOMIC);
 993                if (rc != 0)
 994                        goto error;
 995        }
 996
 997        /* initialize L2 transmission */
 998        gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
 999
1000        /* set up isochronous output URBs for flag idling */
1001        for (k = 0; k < BAS_OUTURBS; ++k) {
1002                urb = ubc->isoouturbs[k].urb;
1003                if (!urb) {
1004                        rc = -EFAULT;
1005                        goto error;
1006                }
1007                urb->dev = bcs->cs->hw.bas->udev;
1008                urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
1009                urb->transfer_flags = URB_ISO_ASAP;
1010                urb->transfer_buffer = ubc->isooutbuf->data;
1011                urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1012                urb->number_of_packets = BAS_NUMFRAMES;
1013                urb->interval = BAS_FRAMETIME;
1014                urb->complete = write_iso_callback;
1015                urb->context = &ubc->isoouturbs[k];
1016                for (j = 0; j < BAS_NUMFRAMES; ++j) {
1017                        urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
1018                        urb->iso_frame_desc[j].length = BAS_NORMFRAME;
1019                        urb->iso_frame_desc[j].status = 0;
1020                        urb->iso_frame_desc[j].actual_length = 0;
1021                }
1022                ubc->isoouturbs[k].limit = -1;
1023        }
1024
1025        /* keep one URB free, submit the others */
1026        for (k = 0; k < BAS_OUTURBS - 1; ++k) {
1027                dump_urb(DEBUG_ISO, "Initial isoc write", urb);
1028                rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
1029                if (rc != 0)
1030                        goto error;
1031        }
1032        dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
1033        ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS - 1];
1034        ubc->isooutdone = ubc->isooutovfl = NULL;
1035        return 0;
1036error:
1037        stopurbs(ubc);
1038        return rc;
1039}
1040
1041/* stopurbs
1042 * cancel the USB request blocks for isochronous input and output
1043 * errors are silently ignored
1044 * argument:
1045 *      B channel control structure
1046 */
1047static void stopurbs(struct bas_bc_state *ubc)
1048{
1049        int k, rc;
1050
1051        ubc->running = 0;
1052
1053        for (k = 0; k < BAS_INURBS; ++k) {
1054                rc = usb_unlink_urb(ubc->isoinurbs[k]);
1055                gig_dbg(DEBUG_ISO,
1056                        "%s: isoc input URB %d unlinked, result = %s",
1057                        __func__, k, get_usb_rcmsg(rc));
1058        }
1059
1060        for (k = 0; k < BAS_OUTURBS; ++k) {
1061                rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
1062                gig_dbg(DEBUG_ISO,
1063                        "%s: isoc output URB %d unlinked, result = %s",
1064                        __func__, k, get_usb_rcmsg(rc));
1065        }
1066}
1067
1068/* Isochronous Write - Bottom Half */
1069/* =============================== */
1070
1071/* submit_iso_write_urb
1072 * fill and submit the next isochronous write URB
1073 * parameters:
1074 *      ucx     context structure containing URB
1075 * return value:
1076 *      number of frames submitted in URB
1077 *      0 if URB not submitted because no data available (isooutbuf busy)
1078 *      error code < 0 on error
1079 */
1080static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
1081{
1082        struct urb *urb = ucx->urb;
1083        struct bas_bc_state *ubc = ucx->bcs->hw.bas;
1084        struct usb_iso_packet_descriptor *ifd;
1085        int corrbytes, nframe, rc;
1086
1087        /* urb->dev is clobbered by USB subsystem */
1088        urb->dev = ucx->bcs->cs->hw.bas->udev;
1089        urb->transfer_flags = URB_ISO_ASAP;
1090        urb->transfer_buffer = ubc->isooutbuf->data;
1091        urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1092
1093        for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
1094                ifd = &urb->iso_frame_desc[nframe];
1095
1096                /* compute frame length according to flow control */
1097                ifd->length = BAS_NORMFRAME;
1098                corrbytes = atomic_read(&ubc->corrbytes);
1099                if (corrbytes != 0) {
1100                        gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
1101                                __func__, corrbytes);
1102                        if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
1103                                corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
1104                        else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
1105                                corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
1106                        ifd->length += corrbytes;
1107                        atomic_add(-corrbytes, &ubc->corrbytes);
1108                }
1109
1110                /* retrieve block of data to send */
1111                rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
1112                if (rc < 0) {
1113                        if (rc == -EBUSY) {
1114                                gig_dbg(DEBUG_ISO,
1115                                        "%s: buffer busy at frame %d",
1116                                        __func__, nframe);
1117                                /* tasklet will be restarted from
1118                                   gigaset_isoc_send_skb() */
1119                        } else {
1120                                dev_err(ucx->bcs->cs->dev,
1121                                        "%s: buffer error %d at frame %d\n",
1122                                        __func__, rc, nframe);
1123                                return rc;
1124                        }
1125                        break;
1126                }
1127                ifd->offset = rc;
1128                ucx->limit = ubc->isooutbuf->nextread;
1129                ifd->status = 0;
1130                ifd->actual_length = 0;
1131        }
1132        if (unlikely(nframe == 0))
1133                return 0;       /* no data to send */
1134        urb->number_of_packets = nframe;
1135
1136        rc = usb_submit_urb(urb, GFP_ATOMIC);
1137        if (unlikely(rc)) {
1138                if (rc == -ENODEV)
1139                        /* device removed - give up silently */
1140                        gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
1141                else
1142                        dev_err(ucx->bcs->cs->dev,
1143                                "could not submit isoc write URB: %s\n",
1144                                get_usb_rcmsg(rc));
1145                return rc;
1146        }
1147        ++ubc->numsub;
1148        return nframe;
1149}
1150
1151/* write_iso_tasklet
1152 * tasklet scheduled when an isochronous output URB from the Gigaset device
1153 * has completed
1154 * parameter:
1155 *      data    B channel state structure
1156 */
1157static void write_iso_tasklet(unsigned long data)
1158{
1159        struct bc_state *bcs = (struct bc_state *) data;
1160        struct bas_bc_state *ubc = bcs->hw.bas;
1161        struct cardstate *cs = bcs->cs;
1162        struct isow_urbctx_t *done, *next, *ovfl;
1163        struct urb *urb;
1164        int status;
1165        struct usb_iso_packet_descriptor *ifd;
1166        unsigned long flags;
1167        int i;
1168        struct sk_buff *skb;
1169        int len;
1170        int rc;
1171
1172        /* loop while completed URBs arrive in time */
1173        for (;;) {
1174                if (unlikely(!(ubc->running))) {
1175                        gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1176                        return;
1177                }
1178
1179                /* retrieve completed URBs */
1180                spin_lock_irqsave(&ubc->isooutlock, flags);
1181                done = ubc->isooutdone;
1182                ubc->isooutdone = NULL;
1183                ovfl = ubc->isooutovfl;
1184                ubc->isooutovfl = NULL;
1185                spin_unlock_irqrestore(&ubc->isooutlock, flags);
1186                if (ovfl) {
1187                        dev_err(cs->dev, "isoc write underrun\n");
1188                        error_hangup(bcs);
1189                        break;
1190                }
1191                if (!done)
1192                        break;
1193
1194                /* submit free URB if available */
1195                spin_lock_irqsave(&ubc->isooutlock, flags);
1196                next = ubc->isooutfree;
1197                ubc->isooutfree = NULL;
1198                spin_unlock_irqrestore(&ubc->isooutlock, flags);
1199                if (next) {
1200                        rc = submit_iso_write_urb(next);
1201                        if (unlikely(rc <= 0 && rc != -ENODEV)) {
1202                                /* could not submit URB, put it back */
1203                                spin_lock_irqsave(&ubc->isooutlock, flags);
1204                                if (ubc->isooutfree == NULL) {
1205                                        ubc->isooutfree = next;
1206                                        next = NULL;
1207                                }
1208                                spin_unlock_irqrestore(&ubc->isooutlock, flags);
1209                                if (next) {
1210                                        /* couldn't put it back */
1211                                        dev_err(cs->dev,
1212                                                "losing isoc write URB\n");
1213                                        error_hangup(bcs);
1214                                }
1215                        }
1216                }
1217
1218                /* process completed URB */
1219                urb = done->urb;
1220                status = done->status;
1221                switch (status) {
1222                case -EXDEV:                    /* partial completion */
1223                        gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1224                                __func__);
1225                        /* fall through - what's the difference anyway? */
1226                case 0:                         /* normal completion */
1227                        /* inspect individual frames
1228                         * assumptions (for lack of documentation):
1229                         * - actual_length bytes of first frame in error are
1230                         *   successfully sent
1231                         * - all following frames are not sent at all
1232                         */
1233                        for (i = 0; i < BAS_NUMFRAMES; i++) {
1234                                ifd = &urb->iso_frame_desc[i];
1235                                if (ifd->status ||
1236                                    ifd->actual_length != ifd->length) {
1237                                        dev_warn(cs->dev,
1238                                                 "isoc write: frame %d[%d/%d]: %s\n",
1239                                                 i, ifd->actual_length,
1240                                                 ifd->length,
1241                                                 get_usb_statmsg(ifd->status));
1242                                        break;
1243                                }
1244                        }
1245                        break;
1246                case -EPIPE:                    /* stall - probably underrun */
1247                        dev_err(cs->dev, "isoc write: stalled\n");
1248                        error_hangup(bcs);
1249                        break;
1250                default:                        /* other errors */
1251                        dev_warn(cs->dev, "isoc write: %s\n",
1252                                 get_usb_statmsg(status));
1253                }
1254
1255                /* mark the write buffer area covered by this URB as free */
1256                if (done->limit >= 0)
1257                        ubc->isooutbuf->read = done->limit;
1258
1259                /* mark URB as free */
1260                spin_lock_irqsave(&ubc->isooutlock, flags);
1261                next = ubc->isooutfree;
1262                ubc->isooutfree = done;
1263                spin_unlock_irqrestore(&ubc->isooutlock, flags);
1264                if (next) {
1265                        /* only one URB still active - resubmit one */
1266                        rc = submit_iso_write_urb(next);
1267                        if (unlikely(rc <= 0 && rc != -ENODEV)) {
1268                                /* couldn't submit */
1269                                error_hangup(bcs);
1270                        }
1271                }
1272        }
1273
1274        /* process queued SKBs */
1275        while ((skb = skb_dequeue(&bcs->squeue))) {
1276                /* copy to output buffer, doing L2 encapsulation */
1277                len = skb->len;
1278                if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
1279                        /* insufficient buffer space, push back onto queue */
1280                        skb_queue_head(&bcs->squeue, skb);
1281                        gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
1282                                __func__, skb_queue_len(&bcs->squeue));
1283                        break;
1284                }
1285                skb_pull(skb, len);
1286                gigaset_skb_sent(bcs, skb);
1287                dev_kfree_skb_any(skb);
1288        }
1289}
1290
1291/* Isochronous Read - Bottom Half */
1292/* ============================== */
1293
1294/* read_iso_tasklet
1295 * tasklet scheduled when an isochronous input URB from the Gigaset device
1296 * has completed
1297 * parameter:
1298 *      data    B channel state structure
1299 */
1300static void read_iso_tasklet(unsigned long data)
1301{
1302        struct bc_state *bcs = (struct bc_state *) data;
1303        struct bas_bc_state *ubc = bcs->hw.bas;
1304        struct cardstate *cs = bcs->cs;
1305        struct urb *urb;
1306        int status;
1307        struct usb_iso_packet_descriptor *ifd;
1308        char *rcvbuf;
1309        unsigned long flags;
1310        int totleft, numbytes, offset, frame, rc;
1311
1312        /* loop while more completed URBs arrive in the meantime */
1313        for (;;) {
1314                /* retrieve URB */
1315                spin_lock_irqsave(&ubc->isoinlock, flags);
1316                urb = ubc->isoindone;
1317                if (!urb) {
1318                        spin_unlock_irqrestore(&ubc->isoinlock, flags);
1319                        return;
1320                }
1321                status = ubc->isoinstatus;
1322                ubc->isoindone = NULL;
1323                if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1324                        dev_warn(cs->dev,
1325                                 "isoc read overrun, URB dropped (status: %s, %d bytes)\n",
1326                                 get_usb_statmsg(ubc->loststatus),
1327                                 ubc->isoinlost);
1328                        ubc->loststatus = -EINPROGRESS;
1329                }
1330                spin_unlock_irqrestore(&ubc->isoinlock, flags);
1331
1332                if (unlikely(!(ubc->running))) {
1333                        gig_dbg(DEBUG_ISO,
1334                                "%s: channel not running, "
1335                                "dropped URB with status: %s",
1336                                __func__, get_usb_statmsg(status));
1337                        return;
1338                }
1339
1340                switch (status) {
1341                case 0:                         /* normal completion */
1342                        break;
1343                case -EXDEV:                    /* inspect individual frames
1344                                                   (we do that anyway) */
1345                        gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1346                                __func__);
1347                        break;
1348                case -ENOENT:
1349                case -ECONNRESET:
1350                case -EINPROGRESS:
1351                        gig_dbg(DEBUG_ISO, "%s: %s",
1352                                __func__, get_usb_statmsg(status));
1353                        continue;               /* -> skip */
1354                case -EPIPE:
1355                        dev_err(cs->dev, "isoc read: stalled\n");
1356                        error_hangup(bcs);
1357                        continue;               /* -> skip */
1358                default:                        /* other error */
1359                        dev_warn(cs->dev, "isoc read: %s\n",
1360                                 get_usb_statmsg(status));
1361                        goto error;
1362                }
1363
1364                rcvbuf = urb->transfer_buffer;
1365                totleft = urb->actual_length;
1366                for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1367                        ifd = &urb->iso_frame_desc[frame];
1368                        numbytes = ifd->actual_length;
1369                        switch (ifd->status) {
1370                        case 0:                 /* success */
1371                                break;
1372                        case -EPROTO:           /* protocol error or unplug */
1373                        case -EILSEQ:
1374                        case -ETIME:
1375                                /* probably just disconnected, ignore */
1376                                gig_dbg(DEBUG_ISO,
1377                                        "isoc read: frame %d[%d]: %s\n",
1378                                        frame, numbytes,
1379                                        get_usb_statmsg(ifd->status));
1380                                break;
1381                        default:                /* other error */
1382                                /* report, assume transferred bytes are ok */
1383                                dev_warn(cs->dev,
1384                                         "isoc read: frame %d[%d]: %s\n",
1385                                         frame, numbytes,
1386                                         get_usb_statmsg(ifd->status));
1387                        }
1388                        if (unlikely(numbytes > BAS_MAXFRAME))
1389                                dev_warn(cs->dev,
1390                                         "isoc read: frame %d[%d]: %s\n",
1391                                         frame, numbytes,
1392                                         "exceeds max frame size");
1393                        if (unlikely(numbytes > totleft)) {
1394                                dev_warn(cs->dev,
1395                                         "isoc read: frame %d[%d]: %s\n",
1396                                         frame, numbytes,
1397                                         "exceeds total transfer length");
1398                                numbytes = totleft;
1399                        }
1400                        offset = ifd->offset;
1401                        if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1402                                dev_warn(cs->dev,
1403                                         "isoc read: frame %d[%d]: %s\n",
1404                                         frame, numbytes,
1405                                         "exceeds end of buffer");
1406                                numbytes = BAS_INBUFSIZE - offset;
1407                        }
1408                        gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1409                        totleft -= numbytes;
1410                }
1411                if (unlikely(totleft > 0))
1412                        dev_warn(cs->dev, "isoc read: %d data bytes missing\n",
1413                                 totleft);
1414
1415error:
1416                /* URB processed, resubmit */
1417                for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1418                        urb->iso_frame_desc[frame].status = 0;
1419                        urb->iso_frame_desc[frame].actual_length = 0;
1420                }
1421                /* urb->dev is clobbered by USB subsystem */
1422                urb->dev = bcs->cs->hw.bas->udev;
1423                urb->transfer_flags = URB_ISO_ASAP;
1424                urb->number_of_packets = BAS_NUMFRAMES;
1425                rc = usb_submit_urb(urb, GFP_ATOMIC);
1426                if (unlikely(rc != 0 && rc != -ENODEV)) {
1427                        dev_err(cs->dev,
1428                                "could not resubmit isoc read URB: %s\n",
1429                                get_usb_rcmsg(rc));
1430                        dump_urb(DEBUG_ISO, "resubmit isoc read", urb);
1431                        error_hangup(bcs);
1432                }
1433        }
1434}
1435
1436/* Channel Operations */
1437/* ================== */
1438
1439/* req_timeout
1440 * timeout routine for control output request
1441 * argument:
1442 *      controller state structure
1443 */
1444static void req_timeout(unsigned long data)
1445{
1446        struct cardstate *cs = (struct cardstate *) data;
1447        struct bas_cardstate *ucs = cs->hw.bas;
1448        int pending;
1449        unsigned long flags;
1450
1451        check_pending(ucs);
1452
1453        spin_lock_irqsave(&ucs->lock, flags);
1454        pending = ucs->pending;
1455        ucs->pending = 0;
1456        spin_unlock_irqrestore(&ucs->lock, flags);
1457
1458        switch (pending) {
1459        case 0:                                 /* no pending request */
1460                gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1461                break;
1462
1463        case HD_OPEN_ATCHANNEL:
1464                dev_err(cs->dev, "timeout opening AT channel\n");
1465                error_reset(cs);
1466                break;
1467
1468        case HD_OPEN_B1CHANNEL:
1469                dev_err(cs->dev, "timeout opening channel 1\n");
1470                error_hangup(&cs->bcs[0]);
1471                break;
1472
1473        case HD_OPEN_B2CHANNEL:
1474                dev_err(cs->dev, "timeout opening channel 2\n");
1475                error_hangup(&cs->bcs[1]);
1476                break;
1477
1478        case HD_CLOSE_ATCHANNEL:
1479                dev_err(cs->dev, "timeout closing AT channel\n");
1480                error_reset(cs);
1481                break;
1482
1483        case HD_CLOSE_B1CHANNEL:
1484                dev_err(cs->dev, "timeout closing channel 1\n");
1485                error_reset(cs);
1486                break;
1487
1488        case HD_CLOSE_B2CHANNEL:
1489                dev_err(cs->dev, "timeout closing channel 2\n");
1490                error_reset(cs);
1491                break;
1492
1493        case HD_RESET_INTERRUPT_PIPE:
1494                /* error recovery escalation */
1495                dev_err(cs->dev,
1496                        "reset interrupt pipe timeout, attempting USB reset\n");
1497                usb_queue_reset_device(ucs->interface);
1498                break;
1499
1500        default:
1501                dev_warn(cs->dev, "request 0x%02x timed out, clearing\n",
1502                         pending);
1503        }
1504
1505        wake_up(&ucs->waitqueue);
1506}
1507
1508/* write_ctrl_callback
1509 * USB completion handler for control pipe output
1510 * called by the USB subsystem in interrupt context
1511 * parameter:
1512 *      urb     USB request block of completed request
1513 *              urb->context = hardware specific controller state structure
1514 */
1515static void write_ctrl_callback(struct urb *urb)
1516{
1517        struct bas_cardstate *ucs = urb->context;
1518        int status = urb->status;
1519        int rc;
1520        unsigned long flags;
1521
1522        /* check status */
1523        switch (status) {
1524        case 0:                                 /* normal completion */
1525                spin_lock_irqsave(&ucs->lock, flags);
1526                switch (ucs->pending) {
1527                case HD_DEVICE_INIT_ACK:        /* no reply expected */
1528                        del_timer(&ucs->timer_ctrl);
1529                        ucs->pending = 0;
1530                        break;
1531                }
1532                spin_unlock_irqrestore(&ucs->lock, flags);
1533                return;
1534
1535        case -ENOENT:                   /* cancelled */
1536        case -ECONNRESET:               /* cancelled (async) */
1537        case -EINPROGRESS:              /* pending */
1538        case -ENODEV:                   /* device removed */
1539        case -ESHUTDOWN:                /* device shut down */
1540                /* ignore silently */
1541                gig_dbg(DEBUG_USBREQ, "%s: %s",
1542                        __func__, get_usb_statmsg(status));
1543                break;
1544
1545        default:                                /* any failure */
1546                /* don't retry if suspend requested */
1547                if (++ucs->retry_ctrl > BAS_RETRY ||
1548                    (ucs->basstate & BS_SUSPEND)) {
1549                        dev_err(&ucs->interface->dev,
1550                                "control request 0x%02x failed: %s\n",
1551                                ucs->dr_ctrl.bRequest,
1552                                get_usb_statmsg(status));
1553                        break;          /* give up */
1554                }
1555                dev_notice(&ucs->interface->dev,
1556                           "control request 0x%02x: %s, retry %d\n",
1557                           ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
1558                           ucs->retry_ctrl);
1559                /* urb->dev is clobbered by USB subsystem */
1560                urb->dev = ucs->udev;
1561                rc = usb_submit_urb(urb, GFP_ATOMIC);
1562                if (unlikely(rc)) {
1563                        dev_err(&ucs->interface->dev,
1564                                "could not resubmit request 0x%02x: %s\n",
1565                                ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
1566                        break;
1567                }
1568                /* resubmitted */
1569                return;
1570        }
1571
1572        /* failed, clear pending request */
1573        spin_lock_irqsave(&ucs->lock, flags);
1574        del_timer(&ucs->timer_ctrl);
1575        ucs->pending = 0;
1576        spin_unlock_irqrestore(&ucs->lock, flags);
1577        wake_up(&ucs->waitqueue);
1578}
1579
1580/* req_submit
1581 * submit a control output request without message buffer to the Gigaset base
1582 * and optionally start a timeout
1583 * parameters:
1584 *      bcs     B channel control structure
1585 *      req     control request code (HD_*)
1586 *      val     control request parameter value (set to 0 if unused)
1587 *      timeout timeout in seconds (0: no timeout)
1588 * return value:
1589 *      0 on success
1590 *      -EBUSY if another request is pending
1591 *      any URB submission error code
1592 */
1593static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1594{
1595        struct bas_cardstate *ucs = bcs->cs->hw.bas;
1596        int ret;
1597        unsigned long flags;
1598
1599        gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1600
1601        spin_lock_irqsave(&ucs->lock, flags);
1602        if (ucs->pending) {
1603                spin_unlock_irqrestore(&ucs->lock, flags);
1604                dev_err(bcs->cs->dev,
1605                        "submission of request 0x%02x failed: "
1606                        "request 0x%02x still pending\n",
1607                        req, ucs->pending);
1608                return -EBUSY;
1609        }
1610
1611        ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1612        ucs->dr_ctrl.bRequest = req;
1613        ucs->dr_ctrl.wValue = cpu_to_le16(val);
1614        ucs->dr_ctrl.wIndex = 0;
1615        ucs->dr_ctrl.wLength = 0;
1616        usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1617                             usb_sndctrlpipe(ucs->udev, 0),
1618                             (unsigned char *) &ucs->dr_ctrl, NULL, 0,
1619                             write_ctrl_callback, ucs);
1620        ucs->retry_ctrl = 0;
1621        ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
1622        if (unlikely(ret)) {
1623                dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1624                        req, get_usb_rcmsg(ret));
1625                spin_unlock_irqrestore(&ucs->lock, flags);
1626                return ret;
1627        }
1628        ucs->pending = req;
1629
1630        if (timeout > 0) {
1631                gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1632                mod_timer(&ucs->timer_ctrl, jiffies + timeout * HZ / 10);
1633        }
1634
1635        spin_unlock_irqrestore(&ucs->lock, flags);
1636        return 0;
1637}
1638
1639/* gigaset_init_bchannel
1640 * called by common.c to connect a B channel
1641 * initialize isochronous I/O and tell the Gigaset base to open the channel
1642 * argument:
1643 *      B channel control structure
1644 * return value:
1645 *      0 on success, error code < 0 on error
1646 */
1647static int gigaset_init_bchannel(struct bc_state *bcs)
1648{
1649        struct cardstate *cs = bcs->cs;
1650        int req, ret;
1651        unsigned long flags;
1652
1653        spin_lock_irqsave(&cs->lock, flags);
1654        if (unlikely(!cs->connected)) {
1655                gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1656                spin_unlock_irqrestore(&cs->lock, flags);
1657                return -ENODEV;
1658        }
1659
1660        if (cs->hw.bas->basstate & BS_SUSPEND) {
1661                dev_notice(cs->dev,
1662                           "not starting isoc I/O, suspend in progress\n");
1663                spin_unlock_irqrestore(&cs->lock, flags);
1664                return -EHOSTUNREACH;
1665        }
1666
1667        ret = starturbs(bcs);
1668        if (ret < 0) {
1669                spin_unlock_irqrestore(&cs->lock, flags);
1670                dev_err(cs->dev,
1671                        "could not start isoc I/O for channel B%d: %s\n",
1672                        bcs->channel + 1,
1673                        ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
1674                if (ret != -ENODEV)
1675                        error_hangup(bcs);
1676                return ret;
1677        }
1678
1679        req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1680        ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1681        if (ret < 0) {
1682                dev_err(cs->dev, "could not open channel B%d\n",
1683                        bcs->channel + 1);
1684                stopurbs(bcs->hw.bas);
1685        }
1686
1687        spin_unlock_irqrestore(&cs->lock, flags);
1688        if (ret < 0 && ret != -ENODEV)
1689                error_hangup(bcs);
1690        return ret;
1691}
1692
1693/* gigaset_close_bchannel
1694 * called by common.c to disconnect a B channel
1695 * tell the Gigaset base to close the channel
1696 * stopping isochronous I/O and LL notification will be done when the
1697 * acknowledgement for the close arrives
1698 * argument:
1699 *      B channel control structure
1700 * return value:
1701 *      0 on success, error code < 0 on error
1702 */
1703static int gigaset_close_bchannel(struct bc_state *bcs)
1704{
1705        struct cardstate *cs = bcs->cs;
1706        int req, ret;
1707        unsigned long flags;
1708
1709        spin_lock_irqsave(&cs->lock, flags);
1710        if (unlikely(!cs->connected)) {
1711                spin_unlock_irqrestore(&cs->lock, flags);
1712                gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1713                return -ENODEV;
1714        }
1715
1716        if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1717                /* channel not running: just signal common.c */
1718                spin_unlock_irqrestore(&cs->lock, flags);
1719                gigaset_bchannel_down(bcs);
1720                return 0;
1721        }
1722
1723        /* channel running: tell device to close it */
1724        req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1725        ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1726        if (ret < 0)
1727                dev_err(cs->dev, "closing channel B%d failed\n",
1728                        bcs->channel + 1);
1729
1730        spin_unlock_irqrestore(&cs->lock, flags);
1731        return ret;
1732}
1733
1734/* Device Operations */
1735/* ================= */
1736
1737/* complete_cb
1738 * unqueue first command buffer from queue, waking any sleepers
1739 * must be called with cs->cmdlock held
1740 * parameter:
1741 *      cs      controller state structure
1742 */
1743static void complete_cb(struct cardstate *cs)
1744{
1745        struct cmdbuf_t *cb = cs->cmdbuf;
1746
1747        /* unqueue completed buffer */
1748        cs->cmdbytes -= cs->curlen;
1749        gig_dbg(DEBUG_OUTPUT, "write_command: sent %u bytes, %u left",
1750                cs->curlen, cs->cmdbytes);
1751        if (cb->next != NULL) {
1752                cs->cmdbuf = cb->next;
1753                cs->cmdbuf->prev = NULL;
1754                cs->curlen = cs->cmdbuf->len;
1755        } else {
1756                cs->cmdbuf = NULL;
1757                cs->lastcmdbuf = NULL;
1758                cs->curlen = 0;
1759        }
1760
1761        if (cb->wake_tasklet)
1762                tasklet_schedule(cb->wake_tasklet);
1763
1764        kfree(cb);
1765}
1766
1767/* write_command_callback
1768 * USB completion handler for AT command transmission
1769 * called by the USB subsystem in interrupt context
1770 * parameter:
1771 *      urb     USB request block of completed request
1772 *              urb->context = controller state structure
1773 */
1774static void write_command_callback(struct urb *urb)
1775{
1776        struct cardstate *cs = urb->context;
1777        struct bas_cardstate *ucs = cs->hw.bas;
1778        int status = urb->status;
1779        unsigned long flags;
1780
1781        update_basstate(ucs, 0, BS_ATWRPEND);
1782        wake_up(&ucs->waitqueue);
1783
1784        /* check status */
1785        switch (status) {
1786        case 0:                                 /* normal completion */
1787                break;
1788        case -ENOENT:                   /* cancelled */
1789        case -ECONNRESET:               /* cancelled (async) */
1790        case -EINPROGRESS:              /* pending */
1791        case -ENODEV:                   /* device removed */
1792        case -ESHUTDOWN:                /* device shut down */
1793                /* ignore silently */
1794                gig_dbg(DEBUG_USBREQ, "%s: %s",
1795                        __func__, get_usb_statmsg(status));
1796                return;
1797        default:                                /* any failure */
1798                if (++ucs->retry_cmd_out > BAS_RETRY) {
1799                        dev_warn(cs->dev,
1800                                 "command write: %s, "
1801                                 "giving up after %d retries\n",
1802                                 get_usb_statmsg(status),
1803                                 ucs->retry_cmd_out);
1804                        break;
1805                }
1806                if (ucs->basstate & BS_SUSPEND) {
1807                        dev_warn(cs->dev,
1808                                 "command write: %s, "
1809                                 "won't retry - suspend requested\n",
1810                                 get_usb_statmsg(status));
1811                        break;
1812                }
1813                if (cs->cmdbuf == NULL) {
1814                        dev_warn(cs->dev,
1815                                 "command write: %s, "
1816                                 "cannot retry - cmdbuf gone\n",
1817                                 get_usb_statmsg(status));
1818                        break;
1819                }
1820                dev_notice(cs->dev, "command write: %s, retry %d\n",
1821                           get_usb_statmsg(status), ucs->retry_cmd_out);
1822                if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1823                        /* resubmitted - bypass regular exit block */
1824                        return;
1825                /* command send failed, assume base still waiting */
1826                update_basstate(ucs, BS_ATREADY, 0);
1827        }
1828
1829        spin_lock_irqsave(&cs->cmdlock, flags);
1830        if (cs->cmdbuf != NULL)
1831                complete_cb(cs);
1832        spin_unlock_irqrestore(&cs->cmdlock, flags);
1833}
1834
1835/* atrdy_timeout
1836 * timeout routine for AT command transmission
1837 * argument:
1838 *      controller state structure
1839 */
1840static void atrdy_timeout(unsigned long data)
1841{
1842        struct cardstate *cs = (struct cardstate *) data;
1843        struct bas_cardstate *ucs = cs->hw.bas;
1844
1845        dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1846
1847        /* fake the missing signal - what else can I do? */
1848        update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1849        start_cbsend(cs);
1850}
1851
1852/* atwrite_submit
1853 * submit an HD_WRITE_ATMESSAGE command URB
1854 * parameters:
1855 *      cs      controller state structure
1856 *      buf     buffer containing command to send
1857 *      len     length of command to send
1858 * return value:
1859 *      0 on success
1860 *      -EBUSY if another request is pending
1861 *      any URB submission error code
1862 */
1863static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1864{
1865        struct bas_cardstate *ucs = cs->hw.bas;
1866        int rc;
1867
1868        gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1869
1870        if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1871                dev_err(cs->dev,
1872                        "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1873                return -EBUSY;
1874        }
1875
1876        ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1877        ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1878        ucs->dr_cmd_out.wValue = 0;
1879        ucs->dr_cmd_out.wIndex = 0;
1880        ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1881        usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1882                             usb_sndctrlpipe(ucs->udev, 0),
1883                             (unsigned char *) &ucs->dr_cmd_out, buf, len,
1884                             write_command_callback, cs);
1885        rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
1886        if (unlikely(rc)) {
1887                update_basstate(ucs, 0, BS_ATWRPEND);
1888                dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1889                        get_usb_rcmsg(rc));
1890                return rc;
1891        }
1892
1893        /* submitted successfully, start timeout if necessary */
1894        if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1895                gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
1896                        ATRDY_TIMEOUT);
1897                mod_timer(&ucs->timer_atrdy, jiffies + ATRDY_TIMEOUT * HZ / 10);
1898        }
1899        return 0;
1900}
1901
1902/* start_cbsend
1903 * start transmission of AT command queue if necessary
1904 * parameter:
1905 *      cs              controller state structure
1906 * return value:
1907 *      0 on success
1908 *      error code < 0 on error
1909 */
1910static int start_cbsend(struct cardstate *cs)
1911{
1912        struct cmdbuf_t *cb;
1913        struct bas_cardstate *ucs = cs->hw.bas;
1914        unsigned long flags;
1915        int rc;
1916        int retval = 0;
1917
1918        /* check if suspend requested */
1919        if (ucs->basstate & BS_SUSPEND) {
1920                gig_dbg(DEBUG_OUTPUT, "suspending");
1921                return -EHOSTUNREACH;
1922        }
1923
1924        /* check if AT channel is open */
1925        if (!(ucs->basstate & BS_ATOPEN)) {
1926                gig_dbg(DEBUG_OUTPUT, "AT channel not open");
1927                rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1928                if (rc < 0) {
1929                        /* flush command queue */
1930                        spin_lock_irqsave(&cs->cmdlock, flags);
1931                        while (cs->cmdbuf != NULL)
1932                                complete_cb(cs);
1933                        spin_unlock_irqrestore(&cs->cmdlock, flags);
1934                }
1935                return rc;
1936        }
1937
1938        /* try to send first command in queue */
1939        spin_lock_irqsave(&cs->cmdlock, flags);
1940
1941        while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
1942                ucs->retry_cmd_out = 0;
1943                rc = atwrite_submit(cs, cb->buf, cb->len);
1944                if (unlikely(rc)) {
1945                        retval = rc;
1946                        complete_cb(cs);
1947                }
1948        }
1949
1950        spin_unlock_irqrestore(&cs->cmdlock, flags);
1951        return retval;
1952}
1953
1954/* gigaset_write_cmd
1955 * This function is called by the device independent part of the driver
1956 * to transmit an AT command string to the Gigaset device.
1957 * It encapsulates the device specific method for transmission over the
1958 * direct USB connection to the base.
1959 * The command string is added to the queue of commands to send, and
1960 * USB transmission is started if necessary.
1961 * parameters:
1962 *      cs              controller state structure
1963 *      cb              command buffer structure
1964 * return value:
1965 *      number of bytes queued on success
1966 *      error code < 0 on error
1967 */
1968static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb)
1969{
1970        unsigned long flags;
1971        int rc;
1972
1973        gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
1974                           DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1975                           "CMD Transmit", cb->len, cb->buf);
1976
1977        /* translate "+++" escape sequence sent as a single separate command
1978         * into "close AT channel" command for error recovery
1979         * The next command will reopen the AT channel automatically.
1980         */
1981        if (cb->len == 3 && !memcmp(cb->buf, "+++", 3)) {
1982                /* If an HD_RECEIVEATDATA_ACK message remains unhandled
1983                 * because of an error, the base never sends another one.
1984                 * The response channel is thus effectively blocked.
1985                 * Closing and reopening the AT channel does *not* clear
1986                 * this condition.
1987                 * As a stopgap measure, submit a zero-length AT read
1988                 * before closing the AT channel. This has the undocumented
1989                 * effect of triggering a new HD_RECEIVEATDATA_ACK message
1990                 * from the base if necessary.
1991                 * The subsequent AT channel close then discards any pending
1992                 * messages.
1993                 */
1994                spin_lock_irqsave(&cs->lock, flags);
1995                if (!(cs->hw.bas->basstate & BS_ATRDPEND)) {
1996                        kfree(cs->hw.bas->rcvbuf);
1997                        cs->hw.bas->rcvbuf = NULL;
1998                        cs->hw.bas->rcvbuf_size = 0;
1999                        cs->hw.bas->retry_cmd_in = 0;
2000                        atread_submit(cs, 0);
2001                }
2002                spin_unlock_irqrestore(&cs->lock, flags);
2003
2004                rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
2005                if (cb->wake_tasklet)
2006                        tasklet_schedule(cb->wake_tasklet);
2007                if (!rc)
2008                        rc = cb->len;
2009                kfree(cb);
2010                return rc;
2011        }
2012
2013        spin_lock_irqsave(&cs->cmdlock, flags);
2014        cb->prev = cs->lastcmdbuf;
2015        if (cs->lastcmdbuf)
2016                cs->lastcmdbuf->next = cb;
2017        else {
2018                cs->cmdbuf = cb;
2019                cs->curlen = cb->len;
2020        }
2021        cs->cmdbytes += cb->len;
2022        cs->lastcmdbuf = cb;
2023        spin_unlock_irqrestore(&cs->cmdlock, flags);
2024
2025        spin_lock_irqsave(&cs->lock, flags);
2026        if (unlikely(!cs->connected)) {
2027                spin_unlock_irqrestore(&cs->lock, flags);
2028                gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
2029                /* flush command queue */
2030                spin_lock_irqsave(&cs->cmdlock, flags);
2031                while (cs->cmdbuf != NULL)
2032                        complete_cb(cs);
2033                spin_unlock_irqrestore(&cs->cmdlock, flags);
2034                return -ENODEV;
2035        }
2036        rc = start_cbsend(cs);
2037        spin_unlock_irqrestore(&cs->lock, flags);
2038        return rc < 0 ? rc : cb->len;
2039}
2040
2041/* gigaset_write_room
2042 * tty_driver.write_room interface routine
2043 * return number of characters the driver will accept to be written via
2044 * gigaset_write_cmd
2045 * parameter:
2046 *      controller state structure
2047 * return value:
2048 *      number of characters
2049 */
2050static int gigaset_write_room(struct cardstate *cs)
2051{
2052        return IF_WRITEBUF;
2053}
2054
2055/* gigaset_chars_in_buffer
2056 * tty_driver.chars_in_buffer interface routine
2057 * return number of characters waiting to be sent
2058 * parameter:
2059 *      controller state structure
2060 * return value:
2061 *      number of characters
2062 */
2063static int gigaset_chars_in_buffer(struct cardstate *cs)
2064{
2065        return cs->cmdbytes;
2066}
2067
2068/* gigaset_brkchars
2069 * implementation of ioctl(GIGASET_BRKCHARS)
2070 * parameter:
2071 *      controller state structure
2072 * return value:
2073 *      -EINVAL (unimplemented function)
2074 */
2075static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
2076{
2077        return -EINVAL;
2078}
2079
2080
2081/* Device Initialization/Shutdown */
2082/* ============================== */
2083
2084/* Free hardware dependent part of the B channel structure
2085 * parameter:
2086 *      bcs     B channel structure
2087 */
2088static void gigaset_freebcshw(struct bc_state *bcs)
2089{
2090        struct bas_bc_state *ubc = bcs->hw.bas;
2091        int i;
2092
2093        if (!ubc)
2094                return;
2095
2096        /* kill URBs and tasklets before freeing - better safe than sorry */
2097        ubc->running = 0;
2098        gig_dbg(DEBUG_INIT, "%s: killing isoc URBs", __func__);
2099        for (i = 0; i < BAS_OUTURBS; ++i) {
2100                usb_kill_urb(ubc->isoouturbs[i].urb);
2101                usb_free_urb(ubc->isoouturbs[i].urb);
2102        }
2103        for (i = 0; i < BAS_INURBS; ++i) {
2104                usb_kill_urb(ubc->isoinurbs[i]);
2105                usb_free_urb(ubc->isoinurbs[i]);
2106        }
2107        tasklet_kill(&ubc->sent_tasklet);
2108        tasklet_kill(&ubc->rcvd_tasklet);
2109        kfree(ubc->isooutbuf);
2110        kfree(ubc);
2111        bcs->hw.bas = NULL;
2112}
2113
2114/* Initialize hardware dependent part of the B channel structure
2115 * parameter:
2116 *      bcs     B channel structure
2117 * return value:
2118 *      0 on success, error code < 0 on failure
2119 */
2120static int gigaset_initbcshw(struct bc_state *bcs)
2121{
2122        int i;
2123        struct bas_bc_state *ubc;
2124
2125        bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
2126        if (!ubc) {
2127                pr_err("out of memory\n");
2128                return -ENOMEM;
2129        }
2130
2131        ubc->running = 0;
2132        atomic_set(&ubc->corrbytes, 0);
2133        spin_lock_init(&ubc->isooutlock);
2134        for (i = 0; i < BAS_OUTURBS; ++i) {
2135                ubc->isoouturbs[i].urb = NULL;
2136                ubc->isoouturbs[i].bcs = bcs;
2137        }
2138        ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
2139        ubc->numsub = 0;
2140        ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL);
2141        if (!ubc->isooutbuf) {
2142                pr_err("out of memory\n");
2143                kfree(ubc);
2144                bcs->hw.bas = NULL;
2145                return -ENOMEM;
2146        }
2147        tasklet_init(&ubc->sent_tasklet,
2148                     write_iso_tasklet, (unsigned long) bcs);
2149
2150        spin_lock_init(&ubc->isoinlock);
2151        for (i = 0; i < BAS_INURBS; ++i)
2152                ubc->isoinurbs[i] = NULL;
2153        ubc->isoindone = NULL;
2154        ubc->loststatus = -EINPROGRESS;
2155        ubc->isoinlost = 0;
2156        ubc->seqlen = 0;
2157        ubc->inbyte = 0;
2158        ubc->inbits = 0;
2159        ubc->goodbytes = 0;
2160        ubc->alignerrs = 0;
2161        ubc->fcserrs = 0;
2162        ubc->frameerrs = 0;
2163        ubc->giants = 0;
2164        ubc->runts = 0;
2165        ubc->aborts = 0;
2166        ubc->shared0s = 0;
2167        ubc->stolen0s = 0;
2168        tasklet_init(&ubc->rcvd_tasklet,
2169                     read_iso_tasklet, (unsigned long) bcs);
2170        return 0;
2171}
2172
2173static void gigaset_reinitbcshw(struct bc_state *bcs)
2174{
2175        struct bas_bc_state *ubc = bcs->hw.bas;
2176
2177        bcs->hw.bas->running = 0;
2178        atomic_set(&bcs->hw.bas->corrbytes, 0);
2179        bcs->hw.bas->numsub = 0;
2180        spin_lock_init(&ubc->isooutlock);
2181        spin_lock_init(&ubc->isoinlock);
2182        ubc->loststatus = -EINPROGRESS;
2183}
2184
2185static void gigaset_freecshw(struct cardstate *cs)
2186{
2187        /* timers, URBs and rcvbuf are disposed of in disconnect */
2188        kfree(cs->hw.bas->int_in_buf);
2189        kfree(cs->hw.bas);
2190        cs->hw.bas = NULL;
2191}
2192
2193/* Initialize hardware dependent part of the cardstate structure
2194 * parameter:
2195 *      cs      cardstate structure
2196 * return value:
2197 *      0 on success, error code < 0 on failure
2198 */
2199static int gigaset_initcshw(struct cardstate *cs)
2200{
2201        struct bas_cardstate *ucs;
2202
2203        cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
2204        if (!ucs) {
2205                pr_err("out of memory\n");
2206                return -ENOMEM;
2207        }
2208        ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
2209        if (!ucs->int_in_buf) {
2210                kfree(ucs);
2211                pr_err("out of memory\n");
2212                return -ENOMEM;
2213        }
2214
2215        ucs->urb_cmd_in = NULL;
2216        ucs->urb_cmd_out = NULL;
2217        ucs->rcvbuf = NULL;
2218        ucs->rcvbuf_size = 0;
2219
2220        spin_lock_init(&ucs->lock);
2221        ucs->pending = 0;
2222
2223        ucs->basstate = 0;
2224        setup_timer(&ucs->timer_ctrl, req_timeout, (unsigned long) cs);
2225        setup_timer(&ucs->timer_atrdy, atrdy_timeout, (unsigned long) cs);
2226        setup_timer(&ucs->timer_cmd_in, cmd_in_timeout, (unsigned long) cs);
2227        setup_timer(&ucs->timer_int_in, int_in_resubmit, (unsigned long) cs);
2228        init_waitqueue_head(&ucs->waitqueue);
2229        INIT_WORK(&ucs->int_in_wq, int_in_work);
2230
2231        return 0;
2232}
2233
2234/* freeurbs
2235 * unlink and deallocate all URBs unconditionally
2236 * caller must make sure that no commands are still in progress
2237 * parameter:
2238 *      cs      controller state structure
2239 */
2240static void freeurbs(struct cardstate *cs)
2241{
2242        struct bas_cardstate *ucs = cs->hw.bas;
2243        struct bas_bc_state *ubc;
2244        int i, j;
2245
2246        gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
2247        for (j = 0; j < BAS_CHANNELS; ++j) {
2248                ubc = cs->bcs[j].hw.bas;
2249                for (i = 0; i < BAS_OUTURBS; ++i) {
2250                        usb_kill_urb(ubc->isoouturbs[i].urb);
2251                        usb_free_urb(ubc->isoouturbs[i].urb);
2252                        ubc->isoouturbs[i].urb = NULL;
2253                }
2254                for (i = 0; i < BAS_INURBS; ++i) {
2255                        usb_kill_urb(ubc->isoinurbs[i]);
2256                        usb_free_urb(ubc->isoinurbs[i]);
2257                        ubc->isoinurbs[i] = NULL;
2258                }
2259        }
2260        usb_kill_urb(ucs->urb_int_in);
2261        usb_free_urb(ucs->urb_int_in);
2262        ucs->urb_int_in = NULL;
2263        usb_kill_urb(ucs->urb_cmd_out);
2264        usb_free_urb(ucs->urb_cmd_out);
2265        ucs->urb_cmd_out = NULL;
2266        usb_kill_urb(ucs->urb_cmd_in);
2267        usb_free_urb(ucs->urb_cmd_in);
2268        ucs->urb_cmd_in = NULL;
2269        usb_kill_urb(ucs->urb_ctrl);
2270        usb_free_urb(ucs->urb_ctrl);
2271        ucs->urb_ctrl = NULL;
2272}
2273
2274/* gigaset_probe
2275 * This function is called when a new USB device is connected.
2276 * It checks whether the new device is handled by this driver.
2277 */
2278static int gigaset_probe(struct usb_interface *interface,
2279                         const struct usb_device_id *id)
2280{
2281        struct usb_host_interface *hostif;
2282        struct usb_device *udev = interface_to_usbdev(interface);
2283        struct cardstate *cs = NULL;
2284        struct bas_cardstate *ucs = NULL;
2285        struct bas_bc_state *ubc;
2286        struct usb_endpoint_descriptor *endpoint;
2287        int i, j;
2288        int rc;
2289
2290        gig_dbg(DEBUG_INIT,
2291                "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2292                __func__, le16_to_cpu(udev->descriptor.idVendor),
2293                le16_to_cpu(udev->descriptor.idProduct));
2294
2295        /* set required alternate setting */
2296        hostif = interface->cur_altsetting;
2297        if (hostif->desc.bAlternateSetting != 3) {
2298                gig_dbg(DEBUG_INIT,
2299                        "%s: wrong alternate setting %d - trying to switch",
2300                        __func__, hostif->desc.bAlternateSetting);
2301                if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3)
2302                    < 0) {
2303                        dev_warn(&udev->dev, "usb_set_interface failed, "
2304                                 "device %d interface %d altsetting %d\n",
2305                                 udev->devnum, hostif->desc.bInterfaceNumber,
2306                                 hostif->desc.bAlternateSetting);
2307                        return -ENODEV;
2308                }
2309                hostif = interface->cur_altsetting;
2310        }
2311
2312        /* Reject application specific interfaces
2313         */
2314        if (hostif->desc.bInterfaceClass != 255) {
2315                dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
2316                         __func__, hostif->desc.bInterfaceClass);
2317                return -ENODEV;
2318        }
2319
2320        dev_info(&udev->dev,
2321                 "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
2322                 __func__, le16_to_cpu(udev->descriptor.idVendor),
2323                 le16_to_cpu(udev->descriptor.idProduct));
2324
2325        /* allocate memory for our device state and initialize it */
2326        cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
2327                            GIGASET_MODULENAME);
2328        if (!cs)
2329                return -ENODEV;
2330        ucs = cs->hw.bas;
2331
2332        /* save off device structure ptrs for later use */
2333        usb_get_dev(udev);
2334        ucs->udev = udev;
2335        ucs->interface = interface;
2336        cs->dev = &interface->dev;
2337
2338        /* allocate URBs:
2339         * - one for the interrupt pipe
2340         * - three for the different uses of the default control pipe
2341         * - three for each isochronous pipe
2342         */
2343        if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2344            !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2345            !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
2346            !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
2347                goto allocerr;
2348
2349        for (j = 0; j < BAS_CHANNELS; ++j) {
2350                ubc = cs->bcs[j].hw.bas;
2351                for (i = 0; i < BAS_OUTURBS; ++i)
2352                        if (!(ubc->isoouturbs[i].urb =
2353                              usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2354                                goto allocerr;
2355                for (i = 0; i < BAS_INURBS; ++i)
2356                        if (!(ubc->isoinurbs[i] =
2357                              usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2358                                goto allocerr;
2359        }
2360
2361        ucs->rcvbuf = NULL;
2362        ucs->rcvbuf_size = 0;
2363
2364        /* Fill the interrupt urb and send it to the core */
2365        endpoint = &hostif->endpoint[0].desc;
2366        usb_fill_int_urb(ucs->urb_int_in, udev,
2367                         usb_rcvintpipe(udev,
2368                                        usb_endpoint_num(endpoint)),
2369                         ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
2370                         endpoint->bInterval);
2371        rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2372        if (rc != 0) {
2373                dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2374                        get_usb_rcmsg(rc));
2375                goto error;
2376        }
2377        ucs->retry_int_in = 0;
2378
2379        /* tell the device that the driver is ready */
2380        rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0);
2381        if (rc != 0)
2382                goto error;
2383
2384        /* tell common part that the device is ready */
2385        if (startmode == SM_LOCKED)
2386                cs->mstate = MS_LOCKED;
2387
2388        /* save address of controller structure */
2389        usb_set_intfdata(interface, cs);
2390
2391        rc = gigaset_start(cs);
2392        if (rc < 0)
2393                goto error;
2394
2395        return 0;
2396
2397allocerr:
2398        dev_err(cs->dev, "could not allocate URBs\n");
2399        rc = -ENOMEM;
2400error:
2401        freeurbs(cs);
2402        usb_set_intfdata(interface, NULL);
2403        usb_put_dev(udev);
2404        gigaset_freecs(cs);
2405        return rc;
2406}
2407
2408/* gigaset_disconnect
2409 * This function is called when the Gigaset base is unplugged.
2410 */
2411static void gigaset_disconnect(struct usb_interface *interface)
2412{
2413        struct cardstate *cs;
2414        struct bas_cardstate *ucs;
2415        int j;
2416
2417        cs = usb_get_intfdata(interface);
2418
2419        ucs = cs->hw.bas;
2420
2421        dev_info(cs->dev, "disconnecting Gigaset base\n");
2422
2423        /* mark base as not ready, all channels disconnected */
2424        ucs->basstate = 0;
2425
2426        /* tell LL all channels are down */
2427        for (j = 0; j < BAS_CHANNELS; ++j)
2428                gigaset_bchannel_down(cs->bcs + j);
2429
2430        /* stop driver (common part) */
2431        gigaset_stop(cs);
2432
2433        /* stop delayed work and URBs, free ressources */
2434        del_timer_sync(&ucs->timer_ctrl);
2435        del_timer_sync(&ucs->timer_atrdy);
2436        del_timer_sync(&ucs->timer_cmd_in);
2437        del_timer_sync(&ucs->timer_int_in);
2438        cancel_work_sync(&ucs->int_in_wq);
2439        freeurbs(cs);
2440        usb_set_intfdata(interface, NULL);
2441        kfree(ucs->rcvbuf);
2442        ucs->rcvbuf = NULL;
2443        ucs->rcvbuf_size = 0;
2444        usb_put_dev(ucs->udev);
2445        ucs->interface = NULL;
2446        ucs->udev = NULL;
2447        cs->dev = NULL;
2448        gigaset_freecs(cs);
2449}
2450
2451/* gigaset_suspend
2452 * This function is called before the USB connection is suspended
2453 * or before the USB device is reset.
2454 * In the latter case, message == PMSG_ON.
2455 */
2456static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
2457{
2458        struct cardstate *cs = usb_get_intfdata(intf);
2459        struct bas_cardstate *ucs = cs->hw.bas;
2460        int rc;
2461
2462        /* set suspend flag; this stops AT command/response traffic */
2463        if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
2464                gig_dbg(DEBUG_SUSPEND, "already suspended");
2465                return 0;
2466        }
2467
2468        /* wait a bit for blocking conditions to go away */
2469        rc = wait_event_timeout(ucs->waitqueue,
2470                                !(ucs->basstate &
2471                                  (BS_B1OPEN | BS_B2OPEN | BS_ATRDPEND | BS_ATWRPEND)),
2472                                BAS_TIMEOUT * HZ / 10);
2473        gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
2474
2475        /* check for conditions preventing suspend */
2476        if (ucs->basstate & (BS_B1OPEN | BS_B2OPEN | BS_ATRDPEND | BS_ATWRPEND)) {
2477                dev_warn(cs->dev, "cannot suspend:\n");
2478                if (ucs->basstate & BS_B1OPEN)
2479                        dev_warn(cs->dev, " B channel 1 open\n");
2480                if (ucs->basstate & BS_B2OPEN)
2481                        dev_warn(cs->dev, " B channel 2 open\n");
2482                if (ucs->basstate & BS_ATRDPEND)
2483                        dev_warn(cs->dev, " receiving AT reply\n");
2484                if (ucs->basstate & BS_ATWRPEND)
2485                        dev_warn(cs->dev, " sending AT command\n");
2486                update_basstate(ucs, 0, BS_SUSPEND);
2487                return -EBUSY;
2488        }
2489
2490        /* close AT channel if open */
2491        if (ucs->basstate & BS_ATOPEN) {
2492                gig_dbg(DEBUG_SUSPEND, "closing AT channel");
2493                rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
2494                if (rc) {
2495                        update_basstate(ucs, 0, BS_SUSPEND);
2496                        return rc;
2497                }
2498                wait_event_timeout(ucs->waitqueue, !ucs->pending,
2499                                   BAS_TIMEOUT * HZ / 10);
2500                /* in case of timeout, proceed anyway */
2501        }
2502
2503        /* kill all URBs and delayed work that might still be pending */
2504        usb_kill_urb(ucs->urb_ctrl);
2505        usb_kill_urb(ucs->urb_int_in);
2506        del_timer_sync(&ucs->timer_ctrl);
2507        del_timer_sync(&ucs->timer_atrdy);
2508        del_timer_sync(&ucs->timer_cmd_in);
2509        del_timer_sync(&ucs->timer_int_in);
2510
2511        /* don't try to cancel int_in_wq from within reset as it
2512         * might be the one requesting the reset
2513         */
2514        if (message.event != PM_EVENT_ON)
2515                cancel_work_sync(&ucs->int_in_wq);
2516
2517        gig_dbg(DEBUG_SUSPEND, "suspend complete");
2518        return 0;
2519}
2520
2521/* gigaset_resume
2522 * This function is called after the USB connection has been resumed.
2523 */
2524static int gigaset_resume(struct usb_interface *intf)
2525{
2526        struct cardstate *cs = usb_get_intfdata(intf);
2527        struct bas_cardstate *ucs = cs->hw.bas;
2528        int rc;
2529
2530        /* resubmit interrupt URB for spontaneous messages from base */
2531        rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2532        if (rc) {
2533                dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
2534                        get_usb_rcmsg(rc));
2535                return rc;
2536        }
2537        ucs->retry_int_in = 0;
2538
2539        /* clear suspend flag to reallow activity */
2540        update_basstate(ucs, 0, BS_SUSPEND);
2541
2542        gig_dbg(DEBUG_SUSPEND, "resume complete");
2543        return 0;
2544}
2545
2546/* gigaset_pre_reset
2547 * This function is called before the USB connection is reset.
2548 */
2549static int gigaset_pre_reset(struct usb_interface *intf)
2550{
2551        /* handle just like suspend */
2552        return gigaset_suspend(intf, PMSG_ON);
2553}
2554
2555/* gigaset_post_reset
2556 * This function is called after the USB connection has been reset.
2557 */
2558static int gigaset_post_reset(struct usb_interface *intf)
2559{
2560        /* FIXME: send HD_DEVICE_INIT_ACK? */
2561
2562        /* resume operations */
2563        return gigaset_resume(intf);
2564}
2565
2566
2567static const struct gigaset_ops gigops = {
2568        gigaset_write_cmd,
2569        gigaset_write_room,
2570        gigaset_chars_in_buffer,
2571        gigaset_brkchars,
2572        gigaset_init_bchannel,
2573        gigaset_close_bchannel,
2574        gigaset_initbcshw,
2575        gigaset_freebcshw,
2576        gigaset_reinitbcshw,
2577        gigaset_initcshw,
2578        gigaset_freecshw,
2579        gigaset_set_modem_ctrl,
2580        gigaset_baud_rate,
2581        gigaset_set_line_ctrl,
2582        gigaset_isoc_send_skb,
2583        gigaset_isoc_input,
2584};
2585
2586/* bas_gigaset_init
2587 * This function is called after the kernel module is loaded.
2588 */
2589static int __init bas_gigaset_init(void)
2590{
2591        int result;
2592
2593        /* allocate memory for our driver state and initialize it */
2594        driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2595                                    GIGASET_MODULENAME, GIGASET_DEVNAME,
2596                                    &gigops, THIS_MODULE);
2597        if (driver == NULL)
2598                goto error;
2599
2600        /* register this driver with the USB subsystem */
2601        result = usb_register(&gigaset_usb_driver);
2602        if (result < 0) {
2603                pr_err("error %d registering USB driver\n", -result);
2604                goto error;
2605        }
2606
2607        pr_info(DRIVER_DESC "\n");
2608        return 0;
2609
2610error:
2611        if (driver)
2612                gigaset_freedriver(driver);
2613        driver = NULL;
2614        return -1;
2615}
2616
2617/* bas_gigaset_exit
2618 * This function is called before the kernel module is unloaded.
2619 */
2620static void __exit bas_gigaset_exit(void)
2621{
2622        struct bas_cardstate *ucs;
2623        int i;
2624
2625        gigaset_blockdriver(driver); /* => probe will fail
2626                                      * => no gigaset_start any more
2627                                      */
2628
2629        /* stop all connected devices */
2630        for (i = 0; i < driver->minors; i++) {
2631                if (gigaset_shutdown(driver->cs + i) < 0)
2632                        continue;               /* no device */
2633                /* from now on, no isdn callback should be possible */
2634
2635                /* close all still open channels */
2636                ucs = driver->cs[i].hw.bas;
2637                if (ucs->basstate & BS_B1OPEN) {
2638                        gig_dbg(DEBUG_INIT, "closing B1 channel");
2639                        usb_control_msg(ucs->udev,
2640                                        usb_sndctrlpipe(ucs->udev, 0),
2641                                        HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
2642                                        0, 0, NULL, 0, BAS_TIMEOUT);
2643                }
2644                if (ucs->basstate & BS_B2OPEN) {
2645                        gig_dbg(DEBUG_INIT, "closing B2 channel");
2646                        usb_control_msg(ucs->udev,
2647                                        usb_sndctrlpipe(ucs->udev, 0),
2648                                        HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
2649                                        0, 0, NULL, 0, BAS_TIMEOUT);
2650                }
2651                if (ucs->basstate & BS_ATOPEN) {
2652                        gig_dbg(DEBUG_INIT, "closing AT channel");
2653                        usb_control_msg(ucs->udev,
2654                                        usb_sndctrlpipe(ucs->udev, 0),
2655                                        HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
2656                                        0, 0, NULL, 0, BAS_TIMEOUT);
2657                }
2658                ucs->basstate = 0;
2659        }
2660
2661        /* deregister this driver with the USB subsystem */
2662        usb_deregister(&gigaset_usb_driver);
2663        /* this will call the disconnect-callback */
2664        /* from now on, no disconnect/probe callback should be running */
2665
2666        gigaset_freedriver(driver);
2667        driver = NULL;
2668}
2669
2670
2671module_init(bas_gigaset_init);
2672module_exit(bas_gigaset_exit);
2673
2674MODULE_AUTHOR(DRIVER_AUTHOR);
2675MODULE_DESCRIPTION(DRIVER_DESC);
2676MODULE_LICENSE("GPL");
2677