drivers/isdn/gigaset/usb-gigaset.c

   1 /*
   2  * USB driver for Gigaset 307x directly or using M105 Data.
   3  *
   4  * Copyright (c) 2001 by Stefan Eilers <Eilers.Stefan@epost.de>
   5  *                   and Hansjoerg Lipp <hjlipp@web.de>.
   6  *
   7  * This driver was derived from the USB skeleton driver by
   8  * Greg Kroah-Hartman <greg@kroah.com>
   9  *
  10  * =====================================================================
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License as
  13  *      published by the Free Software Foundation; either version 2 of
  14  *      the License, or (at your option) any later version.
  15  * =====================================================================
  16  */
  17
  18 #include "gigaset.h"
  19
  20 #include <linux/errno.h>
  21 #include <linux/init.h>
  22 #include <linux/slab.h>
  23 #include <linux/usb.h>
  24 #include <linux/module.h>
  25 #include <linux/moduleparam.h>
  26
  27 /* Version Information */
  28 #define DRIVER_AUTHOR "Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers <Eilers.Stefan@epost.de>"
  29 #define DRIVER_DESC "USB Driver for Gigaset 307x using M105"
  30
  31 /* Module parameters */
  32
  33 static int startmode = SM_ISDN;
  34 static int cidmode = 1;
  35
  36 module_param(startmode, int, S_IRUGO);
  37 module_param(cidmode, int, S_IRUGO);
  38 MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
  39 MODULE_PARM_DESC(cidmode, "Call-ID mode");
  40
  41 #define GIGASET_MINORS     1
  42 #define GIGASET_MINOR      8
  43 #define GIGASET_MODULENAME "usb_gigaset"
  44 #define GIGASET_DEVFSNAME  "gig/usb/"
  45 #define GIGASET_DEVNAME    "ttyGU"
  46
  47 #define IF_WRITEBUF 2000 //FIXME  // WAKEUP_CHARS: 256
  48
  49 /* Values for the Gigaset M105 Data */
  50 #define USB_M105_VENDOR_ID      0x0681
  51 #define USB_M105_PRODUCT_ID     0x0009
  52
  53 /* table of devices that work with this driver */
  54 static struct usb_device_id gigaset_table [] = {
  55         { USB_DEVICE(USB_M105_VENDOR_ID, USB_M105_PRODUCT_ID) },
  56         { }                                     /* Terminating entry */
  57 };
  58
  59 MODULE_DEVICE_TABLE(usb, gigaset_table);
  60
  61 /*
  62  * Control requests (empty fields: 00)
  63  *
  64  *       RT|RQ|VALUE|INDEX|LEN  |DATA
  65  * In:
  66  *       C1 08             01
  67  *            Get flags (1 byte). Bits: 0=dtr,1=rts,3-7:?
  68  *       C1 0F             ll ll
  69  *            Get device information/status (llll: 0x200 and 0x40 seen).
  70  *            Real size: I only saw MIN(llll,0x64).
  71  *            Contents: seems to be always the same...
  72  *              offset 0x00: Length of this structure (0x64) (len: 1,2,3 bytes)
  73  *              offset 0x3c: String (16 bit chars): "MCCI USB Serial V2.0"
  74  *              rest:        ?
  75  * Out:
  76  *       41 11
  77  *            Initialize/reset device ?
  78  *       41 00 xx 00
  79  *            ? (xx=00 or 01; 01 on start, 00 on close)
  80  *       41 07 vv mm
  81  *            Set/clear flags vv=value, mm=mask (see RQ 08)
  82  *       41 12 xx
  83  *            Used before the following configuration requests are issued
  84  *            (with xx=0x0f). I've seen other values<0xf, though.
  85  *       41 01 xx xx
  86  *            Set baud rate. xxxx=ceil(0x384000/rate)=trunc(0x383fff/rate)+1.
  87  *       41 03 ps bb
  88  *            Set byte size and parity. p:  0x20=even,0x10=odd,0x00=no parity
  89  *                                     [    0x30: m, 0x40: s           ]
  90  *                                     [s:  0: 1 stop bit; 1: 1.5; 2: 2]
  91  *                                      bb: bits/byte (seen 7 and 8)
  92  *       41 13 -- -- -- -- 10 00 ww 00 00 00 xx 00 00 00 yy 00 00 00 zz 00 00 00
  93  *            ??
  94  *            Initialization: 01, 40, 00, 00
  95  *            Open device:    00  40, 00, 00
  96  *            yy and zz seem to be equal, either 0x00 or 0x0a
  97  *            (ww,xx) pairs seen: (00,00), (00,40), (01,40), (09,80), (19,80)
  98  *       41 19 -- -- -- -- 06 00 00 00 00 xx 11 13
  99  *            Used after every "configuration sequence" (RQ 12, RQs 01/03/13).
 100  *            xx is usually 0x00 but was 0x7e before starting data transfer
 101  *            in unimodem mode. So, this might be an array of characters that need
 102  *            special treatment ("commit all bufferd data"?), 11=^Q, 13=^S.
 103  *
 104  * Unimodem mode: use "modprobe ppp_async flag_time=0" as the device _needs_ two
 105  * flags per packet.
 106  */
 107
 108 static int gigaset_probe(struct usb_interface *interface,
 109                          const struct usb_device_id *id);
 110 static void gigaset_disconnect(struct usb_interface *interface);
 111
 112 static struct gigaset_driver *driver = NULL;
 113 static struct cardstate *cardstate = NULL;
 114
 115 /* usb specific object needed to register this driver with the usb subsystem */
 116 static struct usb_driver gigaset_usb_driver = {
 117         .name =         GIGASET_MODULENAME,
 118         .probe =        gigaset_probe,
 119         .disconnect =   gigaset_disconnect,
 120         .id_table =     gigaset_table,
 121 };
 122
 123 struct usb_cardstate {
 124         struct usb_device       *udev;          /* usb device pointer */
 125         struct usb_interface    *interface;     /* interface for this device */
 126         atomic_t                busy;           /* bulk output in progress */
 127
 128         /* Output buffer */
 129         unsigned char           *bulk_out_buffer;       /* send buffer */
 130         int                     bulk_out_size;          /* send buffer size */
 131         __u8                    bulk_out_endpointAddr;  /* bulk out endpoint */
 132         struct urb              *bulk_out_urb;          /* bulk out urb */
 133
 134         /* Input buffer */
 135         int                     rcvbuf_size;            /* rcv buffer */
 136         struct urb              *read_urb;              /* rcv buffer size */
 137         __u8                    int_in_endpointAddr;    /* int in endpoint */
 138
 139         char                    bchars[6];              /* request 0x19 */
 140 };
 141
 142 struct usb_bc_state {};
 143
 144 static inline unsigned tiocm_to_gigaset(unsigned state)
 145 {
 146         return ((state & TIOCM_DTR) ? 1 : 0) | ((state & TIOCM_RTS) ? 2 : 0);
 147 }
 148
 149 #ifdef CONFIG_GIGASET_UNDOCREQ
 150 /* WARNING: EXPERIMENTAL! */
 151 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
 152                                   unsigned new_state)
 153 {
 154         unsigned mask, val;
 155         int r;
 156
 157         mask = tiocm_to_gigaset(old_state ^ new_state);
 158         val = tiocm_to_gigaset(new_state);
 159
 160         dbg(DEBUG_USBREQ, "set flags 0x%02x with mask 0x%02x", val, mask);
 161         // don't use this in an interrupt/BH
 162         r = usb_control_msg(cs->hw.usb->udev,
 163                             usb_sndctrlpipe(cs->hw.usb->udev, 0), 7, 0x41,
 164                             (val & 0xff) | ((mask & 0xff) << 8), 0,
 165                             NULL, 0, 2000 /* timeout? */);
 166         if (r < 0)
 167                 return r;
 168         //..
 169         return 0;
 170 }
 171
 172 static int set_value(struct cardstate *cs, u8 req, u16 val)
 173 {
 174         int r, r2;
 175
 176         dbg(DEBUG_USBREQ, "request %02x (%04x)", (unsigned)req, (unsigned)val);
 177         r = usb_control_msg(cs->hw.usb->udev,
 178                             usb_sndctrlpipe(cs->hw.usb->udev, 0), 0x12, 0x41,
 179                             0xf /*?*/, 0,
 180                             NULL, 0, 2000 /*?*/); /* no idea, what this does */
 181         if (r < 0) {
 182                 err("error %d on request 0x12", -r);
 183                 return r;
 184         }
 185
 186         r = usb_control_msg(cs->hw.usb->udev,
 187                             usb_sndctrlpipe(cs->hw.usb->udev, 0), req, 0x41,
 188                             val, 0,
 189                             NULL, 0, 2000 /*?*/);
 190         if (r < 0)
 191                 err("error %d on request 0x%02x", -r, (unsigned)req);
 192
 193         r2 = usb_control_msg(cs->hw.usb->udev,
 194                              usb_sndctrlpipe(cs->hw.usb->udev, 0), 0x19, 0x41,
 195                              0, 0, cs->hw.usb->bchars, 6, 2000 /*?*/);
 196         if (r2 < 0)
 197                 err("error %d on request 0x19", -r2);
 198
 199         return r < 0 ? r : (r2 < 0 ? r2 : 0);
 200 }
 201
 202 /* WARNING: HIGHLY EXPERIMENTAL! */
 203 // don't use this in an interrupt/BH
 204 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
 205 {
 206         u16 val;
 207         u32 rate;
 208
 209         cflag &= CBAUD;
 210
 211         switch (cflag) {
 212         //FIXME more values?
 213         case    B300: rate =     300; break;
 214         case    B600: rate =     600; break;
 215         case   B1200: rate =    1200; break;
 216         case   B2400: rate =    2400; break;
 217         case   B4800: rate =    4800; break;
 218         case   B9600: rate =    9600; break;
 219         case  B19200: rate =   19200; break;
 220         case  B38400: rate =   38400; break;
 221         case  B57600: rate =   57600; break;
 222         case B115200: rate =  115200; break;
 223         default:
 224                 rate =  9600;
 225                 err("unsupported baudrate request 0x%x,"
 226                     " using default of B9600", cflag);
 227         }
 228
 229         val = 0x383fff / rate + 1;
 230
 231         return set_value(cs, 1, val);
 232 }
 233
 234 /* WARNING: HIGHLY EXPERIMENTAL! */
 235 // don't use this in an interrupt/BH
 236 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
 237 {
 238         u16 val = 0;
 239
 240         /* set the parity */
 241         if (cflag & PARENB)
 242                 val |= (cflag & PARODD) ? 0x10 : 0x20;
 243
 244         /* set the number of data bits */
 245         switch (cflag & CSIZE) {
 246         case CS5:
 247                 val |= 5 << 8; break;
 248         case CS6:
 249                 val |= 6 << 8; break;
 250         case CS7:
 251                 val |= 7 << 8; break;
 252         case CS8:
 253                 val |= 8 << 8; break;
 254         default:
 255                 err("CSIZE was not CS5-CS8, using default of 8");
 256                 val |= 8 << 8;
 257                 break;
 258         }
 259
 260         /* set the number of stop bits */
 261         if (cflag & CSTOPB) {
 262                 if ((cflag & CSIZE) == CS5)
 263                         val |= 1; /* 1.5 stop bits */ //FIXME is this okay?
 264                 else
 265                         val |= 2; /* 2 stop bits */
 266         }
 267
 268         return set_value(cs, 3, val);
 269 }
 270
 271 #else
 272 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
 273                                   unsigned new_state)
 274 {
 275         return -EINVAL;
 276 }
 277
 278 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
 279 {
 280         return -EINVAL;
 281 }
 282
 283 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
 284 {
 285         return -EINVAL;
 286 }
 287 #endif
 288
 289
 290  /*================================================================================================================*/
 291 static int gigaset_init_bchannel(struct bc_state *bcs)
 292 {
 293         /* nothing to do for M10x */
 294         gigaset_bchannel_up(bcs);
 295         return 0;
 296 }
 297
 298 static int gigaset_close_bchannel(struct bc_state *bcs)
 299 {
 300         /* nothing to do for M10x */
 301         gigaset_bchannel_down(bcs);
 302         return 0;
 303 }
 304
 305 static int write_modem(struct cardstate *cs);
 306 static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb);
 307
 308
 309 /* Write tasklet handler: Continue sending current skb, or send command, or
 310  * start sending an skb from the send queue.
 311  */
 312 static void gigaset_modem_fill(unsigned long data)
 313 {
 314         struct cardstate *cs = (struct cardstate *) data;
 315         struct bc_state *bcs = &cs->bcs[0]; /* only one channel */
 316         struct cmdbuf_t *cb;
 317         unsigned long flags;
 318         int again;
 319
 320         dbg(DEBUG_OUTPUT, "modem_fill");
 321
 322         if (atomic_read(&cs->hw.usb->busy)) {
 323                 dbg(DEBUG_OUTPUT, "modem_fill: busy");
 324                 return;
 325         }
 326
 327         do {
 328                 again = 0;
 329                 if (!bcs->tx_skb) { /* no skb is being sent */
 330                         spin_lock_irqsave(&cs->cmdlock, flags);
 331                         cb = cs->cmdbuf;
 332                         spin_unlock_irqrestore(&cs->cmdlock, flags);
 333                         if (cb) { /* commands to send? */
 334                                 dbg(DEBUG_OUTPUT, "modem_fill: cb");
 335                                 if (send_cb(cs, cb) < 0) {
 336                                         dbg(DEBUG_OUTPUT,
 337                                             "modem_fill: send_cb failed");
 338                                         again = 1; /* no callback will be
 339                                                       called! */
 340                                 }
 341                         } else { /* skbs to send? */
 342                                 bcs->tx_skb = skb_dequeue(&bcs->squeue);
 343                                 if (bcs->tx_skb)
 344                                         dbg(DEBUG_INTR,
 345                                             "Dequeued skb (Adr: %lx)!",
 346                                             (unsigned long) bcs->tx_skb);
 347                         }
 348                 }
 349
 350                 if (bcs->tx_skb) {
 351                         dbg(DEBUG_OUTPUT, "modem_fill: tx_skb");
 352                         if (write_modem(cs) < 0) {
 353                                 dbg(DEBUG_OUTPUT,
 354                                     "modem_fill: write_modem failed");
 355                                 // FIXME should we tell the LL?
 356                                 again = 1; /* no callback will be called! */
 357                         }
 358                 }
 359         } while (again);
 360 }
 361
 362 /**
 363  *      gigaset_read_int_callback
 364  *
 365  *      It is called if the data was received from the device.
 366  */
 367 static void gigaset_read_int_callback(struct urb *urb, struct pt_regs *regs)
 368 {
 369         int resubmit = 0;
 370         int r;
 371         struct cardstate *cs;
 372         unsigned numbytes;
 373         unsigned char *src;
 374         struct inbuf_t *inbuf;
 375
 376         IFNULLRET(urb);
 377         inbuf = (struct inbuf_t *) urb->context;
 378         IFNULLRET(inbuf);
 379         cs = inbuf->cs;
 380         IFNULLGOTO(cs, exit);
 381         IFNULLGOTO(cardstate, exit);
 382
 383         if (!atomic_read(&cs->connected)) {
 384                 err("%s: disconnected", __func__);
 385                 goto exit;
 386         }
 387
 388         if (!urb->status) {
 389                 numbytes = urb->actual_length;
 390
 391                 if (numbytes) {
 392                         src = inbuf->rcvbuf;
 393                         if (unlikely(*src))
 394                                 warn("%s: There was no leading 0, but 0x%02x!",
 395                                      __func__, (unsigned) *src);
 396                         ++src; /* skip leading 0x00 */
 397                         --numbytes;
 398                         if (gigaset_fill_inbuf(inbuf, src, numbytes)) {
 399                                 dbg(DEBUG_INTR, "%s-->BH", __func__);
 400                                 gigaset_schedule_event(inbuf->cs);
 401                         }
 402                 } else
 403                         dbg(DEBUG_INTR, "Received zero block length");
 404                 resubmit = 1;
 405         } else {
 406                 /* The urb might have been killed. */
 407                 dbg(DEBUG_ANY, "%s - nonzero read bulk status received: %d",
 408                     __func__, urb->status);
 409                 if (urb->status != -ENOENT) /* not killed */
 410                         resubmit = 1;
 411         }
 412 exit:
 413         if (resubmit) {
 414                 r = usb_submit_urb(urb, SLAB_ATOMIC);
 415                 if (r)
 416                         err("error %d when resubmitting urb.", -r);
 417         }
 418 }
 419
 420
 421 /* This callback routine is called when data was transmitted to the device. */
 422 static void gigaset_write_bulk_callback(struct urb *urb, struct pt_regs *regs)
 423 {
 424         struct cardstate *cs = (struct cardstate *) urb->context;
 425
 426         IFNULLRET(cs);
 427 #ifdef CONFIG_GIGASET_DEBUG
 428         if (!atomic_read(&cs->connected)) {
 429                 err("%s:not connected", __func__);
 430                 return;
 431         }
 432 #endif
 433         if (urb->status)
 434                 err("bulk transfer failed (status %d)", -urb->status);
 435                 /* That's all we can do. Communication problems
 436                    are handeled by timeouts or network protocols */
 437
 438         atomic_set(&cs->hw.usb->busy, 0);
 439         tasklet_schedule(&cs->write_tasklet);
 440 }
 441
 442 static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb)
 443 {
 444         struct cmdbuf_t *tcb;
 445         unsigned long flags;
 446         int count;
 447         int status = -ENOENT; // FIXME
 448         struct usb_cardstate *ucs = cs->hw.usb;
 449
 450         do {
 451                 if (!cb->len) {
 452                         tcb = cb;
 453
 454                         spin_lock_irqsave(&cs->cmdlock, flags);
 455                         cs->cmdbytes -= cs->curlen;
 456                         dbg(DEBUG_OUTPUT, "send_cb: sent %u bytes, %u left",
 457                             cs->curlen, cs->cmdbytes);
 458                         cs->cmdbuf = cb = cb->next;
 459                         if (cb) {
 460                                 cb->prev = NULL;
 461                                 cs->curlen = cb->len;
 462                         } else {
 463                                 cs->lastcmdbuf = NULL;
 464                                 cs->curlen = 0;
 465                         }
 466                         spin_unlock_irqrestore(&cs->cmdlock, flags);
 467
 468                         if (tcb->wake_tasklet)
 469                                 tasklet_schedule(tcb->wake_tasklet);
 470                         kfree(tcb);
 471                 }
 472                 if (cb) {
 473                         count = min(cb->len, ucs->bulk_out_size);
 474                         usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev,
 475                                           usb_sndbulkpipe(ucs->udev,
 476                                              ucs->bulk_out_endpointAddr & 0x0f),
 477                                           cb->buf + cb->offset, count,
 478                                           gigaset_write_bulk_callback, cs);
 479
 480                         cb->offset += count;
 481                         cb->len -= count;
 482                         atomic_set(&ucs->busy, 1);
 483                         dbg(DEBUG_OUTPUT, "send_cb: send %d bytes", count);
 484
 485                         status = usb_submit_urb(ucs->bulk_out_urb, SLAB_ATOMIC);
 486                         if (status) {
 487                                 atomic_set(&ucs->busy, 0);
 488                                 err("could not submit urb (error %d).",
 489                                     -status);
 490                                 cb->len = 0; /* skip urb => remove cb+wakeup
 491                                                 in next loop cycle */
 492                         }
 493                 }
 494         } while (cb && status); /* next command on error */
 495
 496         return status;
 497 }
 498
 499 /* Send command to device. */
 500 static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf,
 501                              int len, struct tasklet_struct *wake_tasklet)
 502 {
 503         struct cmdbuf_t *cb;
 504         unsigned long flags;
 505
 506         gigaset_dbg_buffer(atomic_read(&cs->mstate) != MS_LOCKED ?
 507                              DEBUG_TRANSCMD : DEBUG_LOCKCMD,
 508                            "CMD Transmit", len, buf, 0);
 509
 510         if (!atomic_read(&cs->connected)) {
 511                 err("%s: not connected", __func__);
 512                 return -ENODEV;
 513         }
 514
 515         if (len <= 0)
 516                 return 0;
 517
 518         if (!(cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC))) {
 519                 err("%s: out of memory", __func__);
 520                 return -ENOMEM;
 521         }
 522
 523         memcpy(cb->buf, buf, len);
 524         cb->len = len;
 525         cb->offset = 0;
 526         cb->next = NULL;
 527         cb->wake_tasklet = wake_tasklet;
 528
 529         spin_lock_irqsave(&cs->cmdlock, flags);
 530         cb->prev = cs->lastcmdbuf;
 531         if (cs->lastcmdbuf)
 532                 cs->lastcmdbuf->next = cb;
 533         else {
 534                 cs->cmdbuf = cb;
 535                 cs->curlen = len;
 536         }
 537         cs->cmdbytes += len;
 538         cs->lastcmdbuf = cb;
 539         spin_unlock_irqrestore(&cs->cmdlock, flags);
 540
 541         tasklet_schedule(&cs->write_tasklet);
 542         return len;
 543 }
 544
 545 static int gigaset_write_room(struct cardstate *cs)
 546 {
 547         unsigned long flags;
 548         unsigned bytes;
 549
 550         spin_lock_irqsave(&cs->cmdlock, flags);
 551         bytes = cs->cmdbytes;
 552         spin_unlock_irqrestore(&cs->cmdlock, flags);
 553
 554         return bytes < IF_WRITEBUF ? IF_WRITEBUF - bytes : 0;
 555 }
 556
 557 static int gigaset_chars_in_buffer(struct cardstate *cs)
 558 {
 559         return cs->cmdbytes;
 560 }
 561
 562 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
 563 {
 564 #ifdef CONFIG_GIGASET_UNDOCREQ
 565         gigaset_dbg_buffer(DEBUG_USBREQ, "brkchars", 6, buf, 0);
 566         memcpy(cs->hw.usb->bchars, buf, 6);
 567         return usb_control_msg(cs->hw.usb->udev,
 568                                usb_sndctrlpipe(cs->hw.usb->udev, 0), 0x19, 0x41,
 569                                0, 0, &buf, 6, 2000);
 570 #else
 571         return -EINVAL;
 572 #endif
 573 }
 574
 575 static int gigaset_freebcshw(struct bc_state *bcs)
 576 {
 577         if (!bcs->hw.usb)
 578                 return 0;
 579         //FIXME
 580         kfree(bcs->hw.usb);
 581         return 1;
 582 }
 583
 584 /* Initialize the b-channel structure */
 585 static int gigaset_initbcshw(struct bc_state *bcs)
 586 {
 587         bcs->hw.usb = kmalloc(sizeof(struct usb_bc_state), GFP_KERNEL);
 588         if (!bcs->hw.usb)
 589                 return 0;
 590
 591         return 1;
 592 }
 593
 594 static void gigaset_reinitbcshw(struct bc_state *bcs)
 595 {
 596 }
 597
 598 static void gigaset_freecshw(struct cardstate *cs)
 599 {
 600         tasklet_kill(&cs->write_tasklet);
 601         kfree(cs->hw.usb);
 602 }
 603
 604 static int gigaset_initcshw(struct cardstate *cs)
 605 {
 606         struct usb_cardstate *ucs;
 607
 608         cs->hw.usb = ucs =
 609                 kmalloc(sizeof(struct usb_cardstate), GFP_KERNEL);
 610         if (!ucs)
 611                 return 0;
 612
 613         ucs->bchars[0] = 0;
 614         ucs->bchars[1] = 0;
 615         ucs->bchars[2] = 0;
 616         ucs->bchars[3] = 0;
 617         ucs->bchars[4] = 0x11;
 618         ucs->bchars[5] = 0x13;
 619         ucs->bulk_out_buffer = NULL;
 620         ucs->bulk_out_urb = NULL;
 621         //ucs->urb_cmd_out = NULL;
 622         ucs->read_urb = NULL;
 623         tasklet_init(&cs->write_tasklet,
 624                      &gigaset_modem_fill, (unsigned long) cs);
 625
 626         return 1;
 627 }
 628
 629 /* Send data from current skb to the device. */
 630 static int write_modem(struct cardstate *cs)
 631 {
 632         int ret;
 633         int count;
 634         struct bc_state *bcs = &cs->bcs[0]; /* only one channel */
 635         struct usb_cardstate *ucs = cs->hw.usb;
 636
 637         IFNULLRETVAL(bcs->tx_skb, -EINVAL);
 638
 639         dbg(DEBUG_WRITE, "len: %d...", bcs->tx_skb->len);
 640
 641         ret = -ENODEV;
 642         IFNULLGOTO(ucs->bulk_out_buffer, error);
 643         IFNULLGOTO(ucs->bulk_out_urb, error);
 644         ret = 0;
 645
 646         if (!bcs->tx_skb->len) {
 647                 dev_kfree_skb_any(bcs->tx_skb);
 648                 bcs->tx_skb = NULL;
 649                 return -EINVAL;
 650         }
 651
 652         /* Copy data to bulk out buffer and  // FIXME copying not necessary
 653          * transmit data
 654          */
 655         count = min(bcs->tx_skb->len, (unsigned) ucs->bulk_out_size);
 656         memcpy(ucs->bulk_out_buffer, bcs->tx_skb->data, count);
 657         skb_pull(bcs->tx_skb, count);
 658
 659         usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev,
 660                           usb_sndbulkpipe(ucs->udev,
 661                                           ucs->bulk_out_endpointAddr & 0x0f),
 662                           ucs->bulk_out_buffer, count,
 663                           gigaset_write_bulk_callback, cs);
 664         atomic_set(&ucs->busy, 1);
 665         dbg(DEBUG_OUTPUT, "write_modem: send %d bytes", count);
 666
 667         ret = usb_submit_urb(ucs->bulk_out_urb, SLAB_ATOMIC);
 668         if (ret) {
 669                 err("could not submit urb (error %d).", -ret);
 670                 atomic_set(&ucs->busy, 0);
 671         }
 672         if (!bcs->tx_skb->len) {
 673                 /* skb sent completely */
 674                 gigaset_skb_sent(bcs, bcs->tx_skb); //FIXME also, when ret<0?
 675
 676                 dbg(DEBUG_INTR,
 677                     "kfree skb (Adr: %lx)!", (unsigned long) bcs->tx_skb);
 678                 dev_kfree_skb_any(bcs->tx_skb);
 679                 bcs->tx_skb = NULL;
 680         }
 681
 682         return ret;
 683 error:
 684         dev_kfree_skb_any(bcs->tx_skb);
 685         bcs->tx_skb = NULL;
 686         return ret;
 687
 688 }
 689
 690 static int gigaset_probe(struct usb_interface *interface,
 691                          const struct usb_device_id *id)
 692 {
 693         int retval;
 694         struct usb_device *udev = interface_to_usbdev(interface);
 695         unsigned int ifnum;
 696         struct usb_host_interface *hostif;
 697         struct cardstate *cs = NULL;
 698         struct usb_cardstate *ucs = NULL;
 699         struct usb_endpoint_descriptor *endpoint;
 700         int buffer_size;
 701         int alt;
 702
 703         info("%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
 704             __func__, le16_to_cpu(udev->descriptor.idVendor),
 705             le16_to_cpu(udev->descriptor.idProduct));
 706
 707         retval = -ENODEV; //FIXME
 708
 709         /* See if the device offered us matches what we can accept */
 710         if ((le16_to_cpu(udev->descriptor.idVendor  != USB_M105_VENDOR_ID)) ||
 711             (le16_to_cpu(udev->descriptor.idProduct != USB_M105_PRODUCT_ID)))
 712                 return -ENODEV;
 713
 714         /* this starts to become ascii art... */
 715         hostif = interface->cur_altsetting;
 716         alt = hostif->desc.bAlternateSetting;
 717         ifnum = hostif->desc.bInterfaceNumber; // FIXME ?
 718
 719         if (alt != 0 || ifnum != 0) {
 720                 warn("ifnum %d, alt %d", ifnum, alt);
 721                 return -ENODEV;
 722         }
 723
 724         /* Reject application specific intefaces
 725          *
 726          */
 727         if (hostif->desc.bInterfaceClass != 255) {
 728                 info("%s: Device matched, but iface_desc[%d]->bInterfaceClass==%d !",
 729                        __func__, ifnum, hostif->desc.bInterfaceClass);
 730                 return -ENODEV;
 731         }
 732
 733         info("%s: Device matched ... !", __func__);
 734
 735         cs = gigaset_getunassignedcs(driver);
 736         if (!cs) {
 737                 warn("No free cardstate!");
 738                 return -ENODEV;
 739         }
 740         ucs = cs->hw.usb;
 741
 742         endpoint = &hostif->endpoint[0].desc;
 743
 744         buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 745         ucs->bulk_out_size = buffer_size;
 746         ucs->bulk_out_endpointAddr = endpoint->bEndpointAddress;
 747         ucs->bulk_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
 748         if (!ucs->bulk_out_buffer) {
 749                 err("Couldn't allocate bulk_out_buffer");
 750                 retval = -ENOMEM;
 751                 goto error;
 752         }
 753
 754         ucs->bulk_out_urb = usb_alloc_urb(0, SLAB_KERNEL);
 755         if (!ucs->bulk_out_urb) {
 756                 err("Couldn't allocate bulk_out_buffer");
 757                 retval = -ENOMEM;
 758                 goto error;
 759         }
 760
 761         endpoint = &hostif->endpoint[1].desc;
 762
 763         atomic_set(&ucs->busy, 0);
 764         ucs->udev = udev;
 765         ucs->interface = interface;
 766
 767         ucs->read_urb = usb_alloc_urb(0, SLAB_KERNEL);
 768         if (!ucs->read_urb) {
 769                 err("No free urbs available");
 770                 retval = -ENOMEM;
 771                 goto error;
 772         }
 773         buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 774         ucs->rcvbuf_size = buffer_size;
 775         ucs->int_in_endpointAddr = endpoint->bEndpointAddress;
 776         cs->inbuf[0].rcvbuf = kmalloc(buffer_size, GFP_KERNEL);
 777         if (!cs->inbuf[0].rcvbuf) {
 778                 err("Couldn't allocate rcvbuf");
 779                 retval = -ENOMEM;
 780                 goto error;
 781         }
 782         /* Fill the interrupt urb and send it to the core */
 783         usb_fill_int_urb(ucs->read_urb, udev,
 784                          usb_rcvintpipe(udev,
 785                                         endpoint->bEndpointAddress & 0x0f),
 786                          cs->inbuf[0].rcvbuf, buffer_size,
 787                          gigaset_read_int_callback,
 788                          cs->inbuf + 0, endpoint->bInterval);
 789
 790         retval = usb_submit_urb(ucs->read_urb, SLAB_KERNEL);
 791         if (retval) {
 792                 err("Could not submit URB!");
 793                 goto error;
 794         }
 795
 796         /* tell common part that the device is ready */
 797         if (startmode == SM_LOCKED)
 798                 atomic_set(&cs->mstate, MS_LOCKED);
 799         if (!gigaset_start(cs)) {
 800                 tasklet_kill(&cs->write_tasklet);
 801                 retval = -ENODEV; //FIXME
 802                 goto error;
 803         }
 804
 805         /* save address of controller structure */
 806         usb_set_intfdata(interface, cs);
 807
 808         /* set up device sysfs */
 809         gigaset_init_dev_sysfs(interface);
 810         return 0;
 811
 812 error:
 813         if (ucs->read_urb)
 814                 usb_kill_urb(ucs->read_urb);
 815         kfree(ucs->bulk_out_buffer);
 816         if (ucs->bulk_out_urb != NULL)
 817                 usb_free_urb(ucs->bulk_out_urb);
 818         kfree(cs->inbuf[0].rcvbuf);
 819         if (ucs->read_urb != NULL)
 820                 usb_free_urb(ucs->read_urb);
 821         ucs->read_urb = ucs->bulk_out_urb = NULL;
 822         cs->inbuf[0].rcvbuf = ucs->bulk_out_buffer = NULL;
 823         gigaset_unassign(cs);
 824         return retval;
 825 }
 826
 827 /**
 828  *      skel_disconnect
 829  */
 830 static void gigaset_disconnect(struct usb_interface *interface)
 831 {
 832         struct cardstate *cs;
 833         struct usb_cardstate *ucs;
 834
 835         cs = usb_get_intfdata(interface);
 836
 837         /* clear device sysfs */
 838         gigaset_free_dev_sysfs(interface);
 839
 840         usb_set_intfdata(interface, NULL);
 841         ucs = cs->hw.usb;
 842         usb_kill_urb(ucs->read_urb);
 843         //info("GigaSet USB device #%d will be disconnected", minor);
 844
 845         gigaset_stop(cs);
 846
 847         tasklet_kill(&cs->write_tasklet);
 848
 849         usb_kill_urb(ucs->bulk_out_urb);  /* FIXME: only if active? */
 850
 851         kfree(ucs->bulk_out_buffer);
 852         if (ucs->bulk_out_urb != NULL)
 853                 usb_free_urb(ucs->bulk_out_urb);
 854         kfree(cs->inbuf[0].rcvbuf);
 855         if (ucs->read_urb != NULL)
 856                 usb_free_urb(ucs->read_urb);
 857         ucs->read_urb = ucs->bulk_out_urb = NULL;
 858         cs->inbuf[0].rcvbuf = ucs->bulk_out_buffer = NULL;
 859
 860         gigaset_unassign(cs);
 861 }
 862
 863 static struct gigaset_ops ops = {
 864         gigaset_write_cmd,
 865         gigaset_write_room,
 866         gigaset_chars_in_buffer,
 867         gigaset_brkchars,
 868         gigaset_init_bchannel,
 869         gigaset_close_bchannel,
 870         gigaset_initbcshw,
 871         gigaset_freebcshw,
 872         gigaset_reinitbcshw,
 873         gigaset_initcshw,
 874         gigaset_freecshw,
 875         gigaset_set_modem_ctrl,
 876         gigaset_baud_rate,
 877         gigaset_set_line_ctrl,
 878         gigaset_m10x_send_skb,
 879         gigaset_m10x_input,
 880 };
 881
 882 /**
 883  *      usb_gigaset_init
 884  * This function is called while kernel-module is loaded
 885  */
 886 static int __init usb_gigaset_init(void)
 887 {
 888         int result;
 889
 890         /* allocate memory for our driver state and intialize it */
 891         if ((driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
 892                                        GIGASET_MODULENAME, GIGASET_DEVNAME,
 893                                        GIGASET_DEVFSNAME, &ops,
 894                                        THIS_MODULE)) == NULL)
 895                 goto error;
 896
 897         /* allocate memory for our device state and intialize it */
 898         cardstate = gigaset_initcs(driver, 1, 1, 0, cidmode, GIGASET_MODULENAME);
 899         if (!cardstate)
 900                 goto error;
 901
 902         /* register this driver with the USB subsystem */
 903         result = usb_register(&gigaset_usb_driver);
 904         if (result < 0) {
 905                 err("usb_gigaset: usb_register failed (error %d)",
 906                     -result);
 907                 goto error;
 908         }
 909
 910         info(DRIVER_AUTHOR);
 911         info(DRIVER_DESC);
 912         return 0;
 913
 914 error:  if (cardstate)
 915                 gigaset_freecs(cardstate);
 916         cardstate = NULL;
 917         if (driver)
 918                 gigaset_freedriver(driver);
 919         driver = NULL;
 920         return -1;
 921 }
 922
 923
 924 /**
 925  *      usb_gigaset_exit
 926  * This function is called while unloading the kernel-module
 927  */
 928 static void __exit usb_gigaset_exit(void)
 929 {
 930         gigaset_blockdriver(driver); /* => probe will fail
 931                                       * => no gigaset_start any more
 932                                       */
 933
 934         gigaset_shutdown(cardstate);
 935         /* from now on, no isdn callback should be possible */
 936
 937         /* deregister this driver with the USB subsystem */
 938         usb_deregister(&gigaset_usb_driver);
 939         /* this will call the disconnect-callback */
 940         /* from now on, no disconnect/probe callback should be running */
 941
 942         gigaset_freecs(cardstate);
 943         cardstate = NULL;
 944         gigaset_freedriver(driver);
 945         driver = NULL;
 946 }
 947
 948
 949 module_init(usb_gigaset_init);
 950 module_exit(usb_gigaset_exit);
 951
 952 MODULE_AUTHOR(DRIVER_AUTHOR);
 953 MODULE_DESCRIPTION(DRIVER_DESC);
 954
 955 MODULE_LICENSE("GPL");