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
   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"
  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_DEVNAME    "ttyGU"
  45
  46 #define IF_WRITEBUF 2000 //FIXME  // WAKEUP_CHARS: 256
  47
  48 /* Values for the Gigaset M105 Data */
  49 #define USB_M105_VENDOR_ID      0x0681
  50 #define USB_M105_PRODUCT_ID     0x0009
  51
  52 /* table of devices that work with this driver */
  53 static const struct usb_device_id gigaset_table [] = {
  54         { USB_DEVICE(USB_M105_VENDOR_ID, USB_M105_PRODUCT_ID) },
  55         { }                                     /* Terminating entry */
  56 };
  57
  58 MODULE_DEVICE_TABLE(usb, gigaset_table);
  59
  60 /*
  61  * Control requests (empty fields: 00)
  62  *
  63  *       RT|RQ|VALUE|INDEX|LEN  |DATA
  64  * In:
  65  *       C1 08             01
  66  *            Get flags (1 byte). Bits: 0=dtr,1=rts,3-7:?
  67  *       C1 0F             ll ll
  68  *            Get device information/status (llll: 0x200 and 0x40 seen).
  69  *            Real size: I only saw MIN(llll,0x64).
  70  *            Contents: seems to be always the same...
  71  *              offset 0x00: Length of this structure (0x64) (len: 1,2,3 bytes)
  72  *              offset 0x3c: String (16 bit chars): "MCCI USB Serial V2.0"
  73  *              rest:        ?
  74  * Out:
  75  *       41 11
  76  *            Initialize/reset device ?
  77  *       41 00 xx 00
  78  *            ? (xx=00 or 01; 01 on start, 00 on close)
  79  *       41 07 vv mm
  80  *            Set/clear flags vv=value, mm=mask (see RQ 08)
  81  *       41 12 xx
  82  *            Used before the following configuration requests are issued
  83  *            (with xx=0x0f). I've seen other values<0xf, though.
  84  *       41 01 xx xx
  85  *            Set baud rate. xxxx=ceil(0x384000/rate)=trunc(0x383fff/rate)+1.
  86  *       41 03 ps bb
  87  *            Set byte size and parity. p:  0x20=even,0x10=odd,0x00=no parity
  88  *                                     [    0x30: m, 0x40: s           ]
  89  *                                     [s:  0: 1 stop bit; 1: 1.5; 2: 2]
  90  *                                      bb: bits/byte (seen 7 and 8)
  91  *       41 13 -- -- -- -- 10 00 ww 00 00 00 xx 00 00 00 yy 00 00 00 zz 00 00 00
  92  *            ??
  93  *            Initialization: 01, 40, 00, 00
  94  *            Open device:    00  40, 00, 00
  95  *            yy and zz seem to be equal, either 0x00 or 0x0a
  96  *            (ww,xx) pairs seen: (00,00), (00,40), (01,40), (09,80), (19,80)
  97  *       41 19 -- -- -- -- 06 00 00 00 00 xx 11 13
  98  *            Used after every "configuration sequence" (RQ 12, RQs 01/03/13).
  99  *            xx is usually 0x00 but was 0x7e before starting data transfer
 100  *            in unimodem mode. So, this might be an array of characters that need
 101  *            special treatment ("commit all bufferd data"?), 11=^Q, 13=^S.
 102  *
 103  * Unimodem mode: use "modprobe ppp_async flag_time=0" as the device _needs_ two
 104  * flags per packet.
 105  */
 106
 107 /* functions called if a device of this driver is connected/disconnected */
 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 /* functions called before/after suspend */
 113 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
 114 static int gigaset_resume(struct usb_interface *intf);
 115 static int gigaset_pre_reset(struct usb_interface *intf);
 116
 117 static struct gigaset_driver *driver = NULL;
 118
 119 /* usb specific object needed to register this driver with the usb subsystem */
 120 static struct usb_driver gigaset_usb_driver = {
 121         .name =         GIGASET_MODULENAME,
 122         .probe =        gigaset_probe,
 123         .disconnect =   gigaset_disconnect,
 124         .id_table =     gigaset_table,
 125         .suspend =      gigaset_suspend,
 126         .resume =       gigaset_resume,
 127         .reset_resume = gigaset_resume,
 128         .pre_reset =    gigaset_pre_reset,
 129         .post_reset =   gigaset_resume,
 130 };
 131
 132 struct usb_cardstate {
 133         struct usb_device       *udev;          /* usb device pointer */
 134         struct usb_interface    *interface;     /* interface for this device */
 135         int                     busy;           /* bulk output in progress */
 136
 137         /* Output buffer */
 138         unsigned char           *bulk_out_buffer;
 139         int                     bulk_out_size;
 140         __u8                    bulk_out_endpointAddr;
 141         struct urb              *bulk_out_urb;
 142
 143         /* Input buffer */
 144         int                     rcvbuf_size;
 145         struct urb              *read_urb;
 146         __u8                    int_in_endpointAddr;
 147
 148         char                    bchars[6];              /* for request 0x19 */
 149 };
 150
 151 static inline unsigned tiocm_to_gigaset(unsigned state)
 152 {
 153         return ((state & TIOCM_DTR) ? 1 : 0) | ((state & TIOCM_RTS) ? 2 : 0);
 154 }
 155
 156 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
 157                                   unsigned new_state)
 158 {
 159         struct usb_device *udev = cs->hw.usb->udev;
 160         unsigned mask, val;
 161         int r;
 162
 163         mask = tiocm_to_gigaset(old_state ^ new_state);
 164         val = tiocm_to_gigaset(new_state);
 165
 166         gig_dbg(DEBUG_USBREQ, "set flags 0x%02x with mask 0x%02x", val, mask);
 167         // don't use this in an interrupt/BH
 168         r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 7, 0x41,
 169                             (val & 0xff) | ((mask & 0xff) << 8), 0,
 170                             NULL, 0, 2000 /* timeout? */);
 171         if (r < 0)
 172                 return r;
 173         //..
 174         return 0;
 175 }
 176
 177 /*
 178  * Set M105 configuration value
 179  * using undocumented device commands reverse engineered from USB traces
 180  * of the Siemens Windows driver
 181  */
 182 static int set_value(struct cardstate *cs, u8 req, u16 val)
 183 {
 184         struct usb_device *udev = cs->hw.usb->udev;
 185         int r, r2;
 186
 187         gig_dbg(DEBUG_USBREQ, "request %02x (%04x)",
 188                 (unsigned)req, (unsigned)val);
 189         r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x12, 0x41,
 190                             0xf /*?*/, 0, NULL, 0, 2000 /*?*/);
 191                             /* no idea what this does */
 192         if (r < 0) {
 193                 dev_err(&udev->dev, "error %d on request 0x12\n", -r);
 194                 return r;
 195         }
 196
 197         r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), req, 0x41,
 198                             val, 0, NULL, 0, 2000 /*?*/);
 199         if (r < 0)
 200                 dev_err(&udev->dev, "error %d on request 0x%02x\n",
 201                         -r, (unsigned)req);
 202
 203         r2 = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x19, 0x41,
 204                              0, 0, cs->hw.usb->bchars, 6, 2000 /*?*/);
 205         if (r2 < 0)
 206                 dev_err(&udev->dev, "error %d on request 0x19\n", -r2);
 207
 208         return r < 0 ? r : (r2 < 0 ? r2 : 0);
 209 }
 210
 211 /*
 212  * set the baud rate on the internal serial adapter
 213  * using the undocumented parameter setting command
 214  */
 215 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
 216 {
 217         u16 val;
 218         u32 rate;
 219
 220         cflag &= CBAUD;
 221
 222         switch (cflag) {
 223         //FIXME more values?
 224         case    B300: rate =     300; break;
 225         case    B600: rate =     600; break;
 226         case   B1200: rate =    1200; break;
 227         case   B2400: rate =    2400; break;
 228         case   B4800: rate =    4800; break;
 229         case   B9600: rate =    9600; break;
 230         case  B19200: rate =   19200; break;
 231         case  B38400: rate =   38400; break;
 232         case  B57600: rate =   57600; break;
 233         case B115200: rate =  115200; break;
 234         default:
 235                 rate =  9600;
 236                 dev_err(cs->dev, "unsupported baudrate request 0x%x,"
 237                         " using default of B9600\n", cflag);
 238         }
 239
 240         val = 0x383fff / rate + 1;
 241
 242         return set_value(cs, 1, val);
 243 }
 244
 245 /*
 246  * set the line format on the internal serial adapter
 247  * using the undocumented parameter setting command
 248  */
 249 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
 250 {
 251         u16 val = 0;
 252
 253         /* set the parity */
 254         if (cflag & PARENB)
 255                 val |= (cflag & PARODD) ? 0x10 : 0x20;
 256
 257         /* set the number of data bits */
 258         switch (cflag & CSIZE) {
 259         case CS5:
 260                 val |= 5 << 8; break;
 261         case CS6:
 262                 val |= 6 << 8; break;
 263         case CS7:
 264                 val |= 7 << 8; break;
 265         case CS8:
 266                 val |= 8 << 8; break;
 267         default:
 268                 dev_err(cs->dev, "CSIZE was not CS5-CS8, using default of 8\n");
 269                 val |= 8 << 8;
 270                 break;
 271         }
 272
 273         /* set the number of stop bits */
 274         if (cflag & CSTOPB) {
 275                 if ((cflag & CSIZE) == CS5)
 276                         val |= 1; /* 1.5 stop bits */ //FIXME is this okay?
 277                 else
 278                         val |= 2; /* 2 stop bits */
 279         }
 280
 281         return set_value(cs, 3, val);
 282 }
 283
 284
 285  /*================================================================================================================*/
 286 static int gigaset_init_bchannel(struct bc_state *bcs)
 287 {
 288         /* nothing to do for M10x */
 289         gigaset_bchannel_up(bcs);
 290         return 0;
 291 }
 292
 293 static int gigaset_close_bchannel(struct bc_state *bcs)
 294 {
 295         /* nothing to do for M10x */
 296         gigaset_bchannel_down(bcs);
 297         return 0;
 298 }
 299
 300 static int write_modem(struct cardstate *cs);
 301 static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb);
 302
 303
 304 /* Write tasklet handler: Continue sending current skb, or send command, or
 305  * start sending an skb from the send queue.
 306  */
 307 static void gigaset_modem_fill(unsigned long data)
 308 {
 309         struct cardstate *cs = (struct cardstate *) data;
 310         struct bc_state *bcs = &cs->bcs[0]; /* only one channel */
 311         struct cmdbuf_t *cb;
 312         int again;
 313
 314         gig_dbg(DEBUG_OUTPUT, "modem_fill");
 315
 316         if (cs->hw.usb->busy) {
 317                 gig_dbg(DEBUG_OUTPUT, "modem_fill: busy");
 318                 return;
 319         }
 320
 321         do {
 322                 again = 0;
 323                 if (!bcs->tx_skb) { /* no skb is being sent */
 324                         cb = cs->cmdbuf;
 325                         if (cb) { /* commands to send? */
 326                                 gig_dbg(DEBUG_OUTPUT, "modem_fill: cb");
 327                                 if (send_cb(cs, cb) < 0) {
 328                                         gig_dbg(DEBUG_OUTPUT,
 329                                                 "modem_fill: send_cb failed");
 330                                         again = 1; /* no callback will be
 331                                                       called! */
 332                                 }
 333                         } else { /* skbs to send? */
 334                                 bcs->tx_skb = skb_dequeue(&bcs->squeue);
 335                                 if (bcs->tx_skb)
 336                                         gig_dbg(DEBUG_INTR,
 337                                                 "Dequeued skb (Adr: %lx)!",
 338                                                 (unsigned long) bcs->tx_skb);
 339                         }
 340                 }
 341
 342                 if (bcs->tx_skb) {
 343                         gig_dbg(DEBUG_OUTPUT, "modem_fill: tx_skb");
 344                         if (write_modem(cs) < 0) {
 345                                 gig_dbg(DEBUG_OUTPUT,
 346                                         "modem_fill: write_modem failed");
 347                                 // FIXME should we tell the LL?
 348                                 again = 1; /* no callback will be called! */
 349                         }
 350                 }
 351         } while (again);
 352 }
 353
 354 /*
 355  * Interrupt Input URB completion routine
 356  */
 357 static void gigaset_read_int_callback(struct urb *urb)
 358 {
 359         struct inbuf_t *inbuf = urb->context;
 360         struct cardstate *cs = inbuf->cs;
 361         int status = urb->status;
 362         int r;
 363         unsigned numbytes;
 364         unsigned char *src;
 365         unsigned long flags;
 366
 367         if (!status) {
 368                 numbytes = urb->actual_length;
 369
 370                 if (numbytes) {
 371                         src = inbuf->rcvbuf;
 372                         if (unlikely(*src))
 373                                 dev_warn(cs->dev,
 374                                     "%s: There was no leading 0, but 0x%02x!\n",
 375                                          __func__, (unsigned) *src);
 376                         ++src; /* skip leading 0x00 */
 377                         --numbytes;
 378                         if (gigaset_fill_inbuf(inbuf, src, numbytes)) {
 379                                 gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
 380                                 gigaset_schedule_event(inbuf->cs);
 381                         }
 382                 } else
 383                         gig_dbg(DEBUG_INTR, "Received zero block length");
 384         } else {
 385                 /* The urb might have been killed. */
 386                 gig_dbg(DEBUG_ANY, "%s - nonzero status received: %d",
 387                         __func__, status);
 388                 if (status == -ENOENT || status == -ESHUTDOWN)
 389                         /* killed or endpoint shutdown: don't resubmit */
 390                         return;
 391         }
 392
 393         /* resubmit URB */
 394         spin_lock_irqsave(&cs->lock, flags);
 395         if (!cs->connected) {
 396                 spin_unlock_irqrestore(&cs->lock, flags);
 397                 pr_err("%s: disconnected\n", __func__);
 398                 return;
 399         }
 400         r = usb_submit_urb(urb, GFP_ATOMIC);
 401         spin_unlock_irqrestore(&cs->lock, flags);
 402         if (r)
 403                 dev_err(cs->dev, "error %d resubmitting URB\n", -r);
 404 }
 405
 406
 407 /* This callback routine is called when data was transmitted to the device. */
 408 static void gigaset_write_bulk_callback(struct urb *urb)
 409 {
 410         struct cardstate *cs = urb->context;
 411         int status = urb->status;
 412         unsigned long flags;
 413
 414         switch (status) {
 415         case 0:                 /* normal completion */
 416                 break;
 417         case -ENOENT:           /* killed */
 418                 gig_dbg(DEBUG_ANY, "%s: killed", __func__);
 419                 cs->hw.usb->busy = 0;
 420                 return;
 421         default:
 422                 dev_err(cs->dev, "bulk transfer failed (status %d)\n",
 423                         -status);
 424                 /* That's all we can do. Communication problems
 425                    are handled by timeouts or network protocols. */
 426         }
 427
 428         spin_lock_irqsave(&cs->lock, flags);
 429         if (!cs->connected) {
 430                 pr_err("%s: disconnected\n", __func__);
 431         } else {
 432                 cs->hw.usb->busy = 0;
 433                 tasklet_schedule(&cs->write_tasklet);
 434         }
 435         spin_unlock_irqrestore(&cs->lock, flags);
 436 }
 437
 438 static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb)
 439 {
 440         struct cmdbuf_t *tcb;
 441         unsigned long flags;
 442         int count;
 443         int status = -ENOENT; // FIXME
 444         struct usb_cardstate *ucs = cs->hw.usb;
 445
 446         do {
 447                 if (!cb->len) {
 448                         tcb = cb;
 449
 450                         spin_lock_irqsave(&cs->cmdlock, flags);
 451                         cs->cmdbytes -= cs->curlen;
 452                         gig_dbg(DEBUG_OUTPUT, "send_cb: sent %u bytes, %u left",
 453                                 cs->curlen, cs->cmdbytes);
 454                         cs->cmdbuf = cb = cb->next;
 455                         if (cb) {
 456                                 cb->prev = NULL;
 457                                 cs->curlen = cb->len;
 458                         } else {
 459                                 cs->lastcmdbuf = NULL;
 460                                 cs->curlen = 0;
 461                         }
 462                         spin_unlock_irqrestore(&cs->cmdlock, flags);
 463
 464                         if (tcb->wake_tasklet)
 465                                 tasklet_schedule(tcb->wake_tasklet);
 466                         kfree(tcb);
 467                 }
 468                 if (cb) {
 469                         count = min(cb->len, ucs->bulk_out_size);
 470                         gig_dbg(DEBUG_OUTPUT, "send_cb: send %d bytes", count);
 471
 472                         usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev,
 473                                           usb_sndbulkpipe(ucs->udev,
 474                                              ucs->bulk_out_endpointAddr & 0x0f),
 475                                           cb->buf + cb->offset, count,
 476                                           gigaset_write_bulk_callback, cs);
 477
 478                         cb->offset += count;
 479                         cb->len -= count;
 480                         ucs->busy = 1;
 481
 482                         spin_lock_irqsave(&cs->lock, flags);
 483                         status = cs->connected ? usb_submit_urb(ucs->bulk_out_urb, GFP_ATOMIC) : -ENODEV;
 484                         spin_unlock_irqrestore(&cs->lock, flags);
 485
 486                         if (status) {
 487                                 ucs->busy = 0;
 488                                 dev_err(cs->dev,
 489                                         "could not submit urb (error %d)\n",
 490                                         -status);
 491                                 cb->len = 0; /* skip urb => remove cb+wakeup
 492                                                 in next loop cycle */
 493                         }
 494                 }
 495         } while (cb && status); /* next command on error */
 496
 497         return status;
 498 }
 499
 500 /* Send command to device. */
 501 static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf,
 502                              int len, struct tasklet_struct *wake_tasklet)
 503 {
 504         struct cmdbuf_t *cb;
 505         unsigned long flags;
 506
 507         gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
 508                              DEBUG_TRANSCMD : DEBUG_LOCKCMD,
 509                            "CMD Transmit", len, buf);
 510
 511         if (len <= 0)
 512                 return 0;
 513
 514         if (!(cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC))) {
 515                 dev_err(cs->dev, "%s: out of memory\n", __func__);
 516                 return -ENOMEM;
 517         }
 518
 519         memcpy(cb->buf, buf, len);
 520         cb->len = len;
 521         cb->offset = 0;
 522         cb->next = NULL;
 523         cb->wake_tasklet = wake_tasklet;
 524
 525         spin_lock_irqsave(&cs->cmdlock, flags);
 526         cb->prev = cs->lastcmdbuf;
 527         if (cs->lastcmdbuf)
 528                 cs->lastcmdbuf->next = cb;
 529         else {
 530                 cs->cmdbuf = cb;
 531                 cs->curlen = len;
 532         }
 533         cs->cmdbytes += len;
 534         cs->lastcmdbuf = cb;
 535         spin_unlock_irqrestore(&cs->cmdlock, flags);
 536
 537         spin_lock_irqsave(&cs->lock, flags);
 538         if (cs->connected)
 539                 tasklet_schedule(&cs->write_tasklet);
 540         spin_unlock_irqrestore(&cs->lock, flags);
 541         return len;
 542 }
 543
 544 static int gigaset_write_room(struct cardstate *cs)
 545 {
 546         unsigned bytes;
 547
 548         bytes = cs->cmdbytes;
 549         return bytes < IF_WRITEBUF ? IF_WRITEBUF - bytes : 0;
 550 }
 551
 552 static int gigaset_chars_in_buffer(struct cardstate *cs)
 553 {
 554         return cs->cmdbytes;
 555 }
 556
 557 /*
 558  * set the break characters on the internal serial adapter
 559  * using undocumented device commands reverse engineered from USB traces
 560  * of the Siemens Windows driver
 561  */
 562 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
 563 {
 564         struct usb_device *udev = cs->hw.usb->udev;
 565
 566         gigaset_dbg_buffer(DEBUG_USBREQ, "brkchars", 6, buf);
 567         memcpy(cs->hw.usb->bchars, buf, 6);
 568         return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x19, 0x41,
 569                                0, 0, &buf, 6, 2000);
 570 }
 571
 572 static int gigaset_freebcshw(struct bc_state *bcs)
 573 {
 574         /* unused */
 575         return 1;
 576 }
 577
 578 /* Initialize the b-channel structure */
 579 static int gigaset_initbcshw(struct bc_state *bcs)
 580 {
 581         /* unused */
 582         bcs->hw.usb = NULL;
 583         return 1;
 584 }
 585
 586 static void gigaset_reinitbcshw(struct bc_state *bcs)
 587 {
 588         /* nothing to do for M10x */
 589 }
 590
 591 static void gigaset_freecshw(struct cardstate *cs)
 592 {
 593         tasklet_kill(&cs->write_tasklet);
 594         kfree(cs->hw.usb);
 595 }
 596
 597 static int gigaset_initcshw(struct cardstate *cs)
 598 {
 599         struct usb_cardstate *ucs;
 600
 601         cs->hw.usb = ucs =
 602                 kmalloc(sizeof(struct usb_cardstate), GFP_KERNEL);
 603         if (!ucs) {
 604                 pr_err("out of memory\n");
 605                 return 0;
 606         }
 607
 608         ucs->bchars[0] = 0;
 609         ucs->bchars[1] = 0;
 610         ucs->bchars[2] = 0;
 611         ucs->bchars[3] = 0;
 612         ucs->bchars[4] = 0x11;
 613         ucs->bchars[5] = 0x13;
 614         ucs->bulk_out_buffer = NULL;
 615         ucs->bulk_out_urb = NULL;
 616         ucs->read_urb = NULL;
 617         tasklet_init(&cs->write_tasklet,
 618                      &gigaset_modem_fill, (unsigned long) cs);
 619
 620         return 1;
 621 }
 622
 623 /* Send data from current skb to the device. */
 624 static int write_modem(struct cardstate *cs)
 625 {
 626         int ret = 0;
 627         int count;
 628         struct bc_state *bcs = &cs->bcs[0]; /* only one channel */
 629         struct usb_cardstate *ucs = cs->hw.usb;
 630         unsigned long flags;
 631
 632         gig_dbg(DEBUG_WRITE, "len: %d...", bcs->tx_skb->len);
 633
 634         if (!bcs->tx_skb->len) {
 635                 dev_kfree_skb_any(bcs->tx_skb);
 636                 bcs->tx_skb = NULL;
 637                 return -EINVAL;
 638         }
 639
 640         /* Copy data to bulk out buffer and  // FIXME copying not necessary
 641          * transmit data
 642          */
 643         count = min(bcs->tx_skb->len, (unsigned) ucs->bulk_out_size);
 644         skb_copy_from_linear_data(bcs->tx_skb, ucs->bulk_out_buffer, count);
 645         skb_pull(bcs->tx_skb, count);
 646         ucs->busy = 1;
 647         gig_dbg(DEBUG_OUTPUT, "write_modem: send %d bytes", count);
 648
 649         spin_lock_irqsave(&cs->lock, flags);
 650         if (cs->connected) {
 651                 usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev,
 652                                   usb_sndbulkpipe(ucs->udev,
 653                                                   ucs->bulk_out_endpointAddr & 0x0f),
 654                                   ucs->bulk_out_buffer, count,
 655                                   gigaset_write_bulk_callback, cs);
 656                 ret = usb_submit_urb(ucs->bulk_out_urb, GFP_ATOMIC);
 657         } else {
 658                 ret = -ENODEV;
 659         }
 660         spin_unlock_irqrestore(&cs->lock, flags);
 661
 662         if (ret) {
 663                 dev_err(cs->dev, "could not submit urb (error %d)\n", -ret);
 664                 ucs->busy = 0;
 665         }
 666
 667         if (!bcs->tx_skb->len) {
 668                 /* skb sent completely */
 669                 gigaset_skb_sent(bcs, bcs->tx_skb); //FIXME also, when ret<0?
 670
 671                 gig_dbg(DEBUG_INTR, "kfree skb (Adr: %lx)!",
 672                         (unsigned long) bcs->tx_skb);
 673                 dev_kfree_skb_any(bcs->tx_skb);
 674                 bcs->tx_skb = NULL;
 675         }
 676
 677         return ret;
 678 }
 679
 680 static int gigaset_probe(struct usb_interface *interface,
 681                          const struct usb_device_id *id)
 682 {
 683         int retval;
 684         struct usb_device *udev = interface_to_usbdev(interface);
 685         struct usb_host_interface *hostif = interface->cur_altsetting;
 686         struct cardstate *cs = NULL;
 687         struct usb_cardstate *ucs = NULL;
 688         struct usb_endpoint_descriptor *endpoint;
 689         int buffer_size;
 690
 691         gig_dbg(DEBUG_ANY, "%s: Check if device matches ...", __func__);
 692
 693         /* See if the device offered us matches what we can accept */
 694         if ((le16_to_cpu(udev->descriptor.idVendor)  != USB_M105_VENDOR_ID) ||
 695             (le16_to_cpu(udev->descriptor.idProduct) != USB_M105_PRODUCT_ID)) {
 696                 gig_dbg(DEBUG_ANY, "device ID (0x%x, 0x%x) not for me - skip",
 697                         le16_to_cpu(udev->descriptor.idVendor),
 698                         le16_to_cpu(udev->descriptor.idProduct));
 699                 return -ENODEV;
 700         }
 701         if (hostif->desc.bInterfaceNumber != 0) {
 702                 gig_dbg(DEBUG_ANY, "interface %d not for me - skip",
 703                         hostif->desc.bInterfaceNumber);
 704                 return -ENODEV;
 705         }
 706         if (hostif->desc.bAlternateSetting != 0) {
 707                 dev_notice(&udev->dev, "unsupported altsetting %d - skip",
 708                            hostif->desc.bAlternateSetting);
 709                 return -ENODEV;
 710         }
 711         if (hostif->desc.bInterfaceClass != 255) {
 712                 dev_notice(&udev->dev, "unsupported interface class %d - skip",
 713                            hostif->desc.bInterfaceClass);
 714                 return -ENODEV;
 715         }
 716
 717         dev_info(&udev->dev, "%s: Device matched ... !\n", __func__);
 718
 719         /* allocate memory for our device state and intialize it */
 720         cs = gigaset_initcs(driver, 1, 1, 0, cidmode, GIGASET_MODULENAME);
 721         if (!cs)
 722                 return -ENODEV;
 723         ucs = cs->hw.usb;
 724
 725         /* save off device structure ptrs for later use */
 726         usb_get_dev(udev);
 727         ucs->udev = udev;
 728         ucs->interface = interface;
 729         cs->dev = &interface->dev;
 730
 731         /* save address of controller structure */
 732         usb_set_intfdata(interface, cs);
 733
 734         endpoint = &hostif->endpoint[0].desc;
 735
 736         buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 737         ucs->bulk_out_size = buffer_size;
 738         ucs->bulk_out_endpointAddr = endpoint->bEndpointAddress;
 739         ucs->bulk_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
 740         if (!ucs->bulk_out_buffer) {
 741                 dev_err(cs->dev, "Couldn't allocate bulk_out_buffer\n");
 742                 retval = -ENOMEM;
 743                 goto error;
 744         }
 745
 746         ucs->bulk_out_urb = usb_alloc_urb(0, GFP_KERNEL);
 747         if (!ucs->bulk_out_urb) {
 748                 dev_err(cs->dev, "Couldn't allocate bulk_out_urb\n");
 749                 retval = -ENOMEM;
 750                 goto error;
 751         }
 752
 753         endpoint = &hostif->endpoint[1].desc;
 754
 755         ucs->busy = 0;
 756
 757         ucs->read_urb = usb_alloc_urb(0, GFP_KERNEL);
 758         if (!ucs->read_urb) {
 759                 dev_err(cs->dev, "No free urbs available\n");
 760                 retval = -ENOMEM;
 761                 goto error;
 762         }
 763         buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 764         ucs->rcvbuf_size = buffer_size;
 765         ucs->int_in_endpointAddr = endpoint->bEndpointAddress;
 766         cs->inbuf[0].rcvbuf = kmalloc(buffer_size, GFP_KERNEL);
 767         if (!cs->inbuf[0].rcvbuf) {
 768                 dev_err(cs->dev, "Couldn't allocate rcvbuf\n");
 769                 retval = -ENOMEM;
 770                 goto error;
 771         }
 772         /* Fill the interrupt urb and send it to the core */
 773         usb_fill_int_urb(ucs->read_urb, udev,
 774                          usb_rcvintpipe(udev,
 775                                         endpoint->bEndpointAddress & 0x0f),
 776                          cs->inbuf[0].rcvbuf, buffer_size,
 777                          gigaset_read_int_callback,
 778                          cs->inbuf + 0, endpoint->bInterval);
 779
 780         retval = usb_submit_urb(ucs->read_urb, GFP_KERNEL);
 781         if (retval) {
 782                 dev_err(cs->dev, "Could not submit URB (error %d)\n", -retval);
 783                 goto error;
 784         }
 785
 786         /* tell common part that the device is ready */
 787         if (startmode == SM_LOCKED)
 788                 cs->mstate = MS_LOCKED;
 789
 790         if (!gigaset_start(cs)) {
 791                 tasklet_kill(&cs->write_tasklet);
 792                 retval = -ENODEV; //FIXME
 793                 goto error;
 794         }
 795         return 0;
 796
 797 error:
 798         usb_kill_urb(ucs->read_urb);
 799         kfree(ucs->bulk_out_buffer);
 800         usb_free_urb(ucs->bulk_out_urb);
 801         kfree(cs->inbuf[0].rcvbuf);
 802         usb_free_urb(ucs->read_urb);
 803         usb_set_intfdata(interface, NULL);
 804         ucs->read_urb = ucs->bulk_out_urb = NULL;
 805         cs->inbuf[0].rcvbuf = ucs->bulk_out_buffer = NULL;
 806         usb_put_dev(ucs->udev);
 807         ucs->udev = NULL;
 808         ucs->interface = NULL;
 809         gigaset_freecs(cs);
 810         return retval;
 811 }
 812
 813 static void gigaset_disconnect(struct usb_interface *interface)
 814 {
 815         struct cardstate *cs;
 816         struct usb_cardstate *ucs;
 817
 818         cs = usb_get_intfdata(interface);
 819         ucs = cs->hw.usb;
 820
 821         dev_info(cs->dev, "disconnecting Gigaset USB adapter\n");
 822
 823         usb_kill_urb(ucs->read_urb);
 824
 825         gigaset_stop(cs);
 826
 827         usb_set_intfdata(interface, NULL);
 828         tasklet_kill(&cs->write_tasklet);
 829
 830         usb_kill_urb(ucs->bulk_out_urb);
 831
 832         kfree(ucs->bulk_out_buffer);
 833         usb_free_urb(ucs->bulk_out_urb);
 834         kfree(cs->inbuf[0].rcvbuf);
 835         usb_free_urb(ucs->read_urb);
 836         ucs->read_urb = ucs->bulk_out_urb = NULL;
 837         cs->inbuf[0].rcvbuf = ucs->bulk_out_buffer = NULL;
 838
 839         usb_put_dev(ucs->udev);
 840         ucs->interface = NULL;
 841         ucs->udev = NULL;
 842         cs->dev = NULL;
 843         gigaset_freecs(cs);
 844 }
 845
 846 /* gigaset_suspend
 847  * This function is called before the USB connection is suspended or reset.
 848  */
 849 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
 850 {
 851         struct cardstate *cs = usb_get_intfdata(intf);
 852
 853         /* stop activity */
 854         cs->connected = 0;      /* prevent rescheduling */
 855         usb_kill_urb(cs->hw.usb->read_urb);
 856         tasklet_kill(&cs->write_tasklet);
 857         usb_kill_urb(cs->hw.usb->bulk_out_urb);
 858
 859         gig_dbg(DEBUG_SUSPEND, "suspend complete");
 860         return 0;
 861 }
 862
 863 /* gigaset_resume
 864  * This function is called after the USB connection has been resumed or reset.
 865  */
 866 static int gigaset_resume(struct usb_interface *intf)
 867 {
 868         struct cardstate *cs = usb_get_intfdata(intf);
 869         int rc;
 870
 871         /* resubmit interrupt URB */
 872         cs->connected = 1;
 873         rc = usb_submit_urb(cs->hw.usb->read_urb, GFP_KERNEL);
 874         if (rc) {
 875                 dev_err(cs->dev, "Could not submit read URB (error %d)\n", -rc);
 876                 return rc;
 877         }
 878
 879         gig_dbg(DEBUG_SUSPEND, "resume complete");
 880         return 0;
 881 }
 882
 883 /* gigaset_pre_reset
 884  * This function is called before the USB connection is reset.
 885  */
 886 static int gigaset_pre_reset(struct usb_interface *intf)
 887 {
 888         /* same as suspend */
 889         return gigaset_suspend(intf, PMSG_ON);
 890 }
 891
 892 static const struct gigaset_ops ops = {
 893         gigaset_write_cmd,
 894         gigaset_write_room,
 895         gigaset_chars_in_buffer,
 896         gigaset_brkchars,
 897         gigaset_init_bchannel,
 898         gigaset_close_bchannel,
 899         gigaset_initbcshw,
 900         gigaset_freebcshw,
 901         gigaset_reinitbcshw,
 902         gigaset_initcshw,
 903         gigaset_freecshw,
 904         gigaset_set_modem_ctrl,
 905         gigaset_baud_rate,
 906         gigaset_set_line_ctrl,
 907         gigaset_m10x_send_skb,
 908         gigaset_m10x_input,
 909 };
 910
 911 /*
 912  * This function is called while kernel-module is loaded
 913  */
 914 static int __init usb_gigaset_init(void)
 915 {
 916         int result;
 917
 918         /* allocate memory for our driver state and intialize it */
 919         if ((driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
 920                                        GIGASET_MODULENAME, GIGASET_DEVNAME,
 921                                        &ops, THIS_MODULE)) == NULL)
 922                 goto error;
 923
 924         /* register this driver with the USB subsystem */
 925         result = usb_register(&gigaset_usb_driver);
 926         if (result < 0) {
 927                 pr_err("error %d registering USB driver\n", -result);
 928                 goto error;
 929         }
 930
 931         pr_info(DRIVER_DESC "\n");
 932         return 0;
 933
 934 error:
 935         if (driver)
 936                 gigaset_freedriver(driver);
 937         driver = NULL;
 938         return -1;
 939 }
 940
 941 /*
 942  * This function is called while unloading the kernel-module
 943  */
 944 static void __exit usb_gigaset_exit(void)
 945 {
 946         int i;
 947
 948         gigaset_blockdriver(driver); /* => probe will fail
 949                                       * => no gigaset_start any more
 950                                       */
 951
 952         /* stop all connected devices */
 953         for (i = 0; i < driver->minors; i++)
 954                 gigaset_shutdown(driver->cs + i);
 955
 956         /* from now on, no isdn callback should be possible */
 957
 958         /* deregister this driver with the USB subsystem */
 959         usb_deregister(&gigaset_usb_driver);
 960         /* this will call the disconnect-callback */
 961         /* from now on, no disconnect/probe callback should be running */
 962
 963         gigaset_freedriver(driver);
 964         driver = NULL;
 965 }
 966
 967
 968 module_init(usb_gigaset_init);
 969 module_exit(usb_gigaset_exit);
 970
 971 MODULE_AUTHOR(DRIVER_AUTHOR);
 972 MODULE_DESCRIPTION(DRIVER_DESC);
 973
 974 MODULE_LICENSE("GPL");