drivers/staging/isdn/gigaset/usb-gigaset.c

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This source file includes following definitions.
tiocm_to_gigaset
gigaset_set_modem_ctrl
set_value
gigaset_baud_rate
gigaset_set_line_ctrl
gigaset_init_bchannel
gigaset_close_bchannel
gigaset_modem_fill
gigaset_read_int_callback
gigaset_write_bulk_callback
send_cb
gigaset_write_cmd
gigaset_write_room
gigaset_chars_in_buffer
gigaset_brkchars
gigaset_freebcshw
gigaset_initbcshw
gigaset_reinitbcshw
gigaset_freecshw
gigaset_initcshw
write_modem
gigaset_probe
gigaset_disconnect
gigaset_suspend
gigaset_resume
gigaset_pre_reset
usb_gigaset_init
usb_gigaset_exit
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * USB driver for Gigaset 307x directly or using M105 Data.
   4  *
   5  * Copyright (c) 2001 by Stefan Eilers
   6  *                   and Hansjoerg Lipp <hjlipp@web.de>.
   7  *
   8  * This driver was derived from the USB skeleton driver by
   9  * Greg Kroah-Hartman <greg@kroah.com>
  10  *
  11  * =====================================================================
  12  * =====================================================================
  13  */
  14 
  15 #include "gigaset.h"
  16 #include <linux/usb.h>
  17 #include <linux/module.h>
  18 #include <linux/moduleparam.h>
  19 
  20 /* Version Information */
  21 #define DRIVER_AUTHOR "Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
  22 #define DRIVER_DESC "USB Driver for Gigaset 307x using M105"
  23 
  24 /* Module parameters */
  25 
  26 static int startmode = SM_ISDN;
  27 static int cidmode = 1;
  28 
  29 module_param(startmode, int, S_IRUGO);
  30 module_param(cidmode, int, S_IRUGO);
  31 MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
  32 MODULE_PARM_DESC(cidmode, "Call-ID mode");
  33 
  34 #define GIGASET_MINORS     1
  35 #define GIGASET_MINOR      8
  36 #define GIGASET_MODULENAME "usb_gigaset"
  37 #define GIGASET_DEVNAME    "ttyGU"
  38 
  39 /* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
  40 #define IF_WRITEBUF 264
  41 
  42 /* Values for the Gigaset M105 Data */
  43 #define USB_M105_VENDOR_ID      0x0681
  44 #define USB_M105_PRODUCT_ID     0x0009
  45 
  46 /* table of devices that work with this driver */
  47 static const struct usb_device_id gigaset_table[] = {
  48         { USB_DEVICE(USB_M105_VENDOR_ID, USB_M105_PRODUCT_ID) },
  49         { }                                     /* Terminating entry */
  50 };
  51 
  52 MODULE_DEVICE_TABLE(usb, gigaset_table);
  53 
  54 /*
  55  * Control requests (empty fields: 00)
  56  *
  57  *       RT|RQ|VALUE|INDEX|LEN  |DATA
  58  * In:
  59  *       C1 08             01
  60  *            Get flags (1 byte). Bits: 0=dtr,1=rts,3-7:?
  61  *       C1 0F             ll ll
  62  *            Get device information/status (llll: 0x200 and 0x40 seen).
  63  *            Real size: I only saw MIN(llll,0x64).
  64  *            Contents: seems to be always the same...
  65  *              offset 0x00: Length of this structure (0x64) (len: 1,2,3 bytes)
  66  *              offset 0x3c: String (16 bit chars): "MCCI USB Serial V2.0"
  67  *              rest:        ?
  68  * Out:
  69  *       41 11
  70  *            Initialize/reset device ?
  71  *       41 00 xx 00
  72  *            ? (xx=00 or 01; 01 on start, 00 on close)
  73  *       41 07 vv mm
  74  *            Set/clear flags vv=value, mm=mask (see RQ 08)
  75  *       41 12 xx
  76  *            Used before the following configuration requests are issued
  77  *            (with xx=0x0f). I've seen other values<0xf, though.
  78  *       41 01 xx xx
  79  *            Set baud rate. xxxx=ceil(0x384000/rate)=trunc(0x383fff/rate)+1.
  80  *       41 03 ps bb
  81  *            Set byte size and parity. p:  0x20=even,0x10=odd,0x00=no parity
  82  *                                     [    0x30: m, 0x40: s           ]
  83  *                                     [s:  0: 1 stop bit; 1: 1.5; 2: 2]
  84  *                                      bb: bits/byte (seen 7 and 8)
  85  *       41 13 -- -- -- -- 10 00 ww 00 00 00 xx 00 00 00 yy 00 00 00 zz 00 00 00
  86  *            ??
  87  *            Initialization: 01, 40, 00, 00
  88  *            Open device:    00  40, 00, 00
  89  *            yy and zz seem to be equal, either 0x00 or 0x0a
  90  *            (ww,xx) pairs seen: (00,00), (00,40), (01,40), (09,80), (19,80)
  91  *       41 19 -- -- -- -- 06 00 00 00 00 xx 11 13
  92  *            Used after every "configuration sequence" (RQ 12, RQs 01/03/13).
  93  *            xx is usually 0x00 but was 0x7e before starting data transfer
  94  *            in unimodem mode. So, this might be an array of characters that
  95  *            need special treatment ("commit all bufferd data"?), 11=^Q, 13=^S.
  96  *
  97  * Unimodem mode: use "modprobe ppp_async flag_time=0" as the device _needs_ two
  98  * flags per packet.
  99  */
 100 
 101 /* functions called if a device of this driver is connected/disconnected */
 102 static int gigaset_probe(struct usb_interface *interface,
 103                          const struct usb_device_id *id);
 104 static void gigaset_disconnect(struct usb_interface *interface);
 105 
 106 /* functions called before/after suspend */
 107 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
 108 static int gigaset_resume(struct usb_interface *intf);
 109 static int gigaset_pre_reset(struct usb_interface *intf);
 110 
 111 static struct gigaset_driver *driver;
 112 
 113 /* usb specific object needed to register this driver with the usb subsystem */
 114 static struct usb_driver gigaset_usb_driver = {
 115         .name =         GIGASET_MODULENAME,
 116         .probe =        gigaset_probe,
 117         .disconnect =   gigaset_disconnect,
 118         .id_table =     gigaset_table,
 119         .suspend =      gigaset_suspend,
 120         .resume =       gigaset_resume,
 121         .reset_resume = gigaset_resume,
 122         .pre_reset =    gigaset_pre_reset,
 123         .post_reset =   gigaset_resume,
 124         .disable_hub_initiated_lpm = 1,
 125 };
 126 
 127 struct usb_cardstate {
 128         struct usb_device       *udev;          /* usb device pointer */
 129         struct usb_interface    *interface;     /* interface for this device */
 130         int                     busy;           /* bulk output in progress */
 131 
 132         /* Output buffer */
 133         unsigned char           *bulk_out_buffer;
 134         int                     bulk_out_size;
 135         int                     bulk_out_epnum;
 136         struct urb              *bulk_out_urb;
 137 
 138         /* Input buffer */
 139         unsigned char           *rcvbuf;
 140         int                     rcvbuf_size;
 141         struct urb              *read_urb;
 142 
 143         char                    bchars[6];              /* for request 0x19 */
 144 };
 145 
 146 static inline unsigned tiocm_to_gigaset(unsigned state)
 147 {
 148         return ((state & TIOCM_DTR) ? 1 : 0) | ((state & TIOCM_RTS) ? 2 : 0);
 149 }
 150 
 151 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
 152                                   unsigned new_state)
 153 {
 154         struct usb_device *udev = cs->hw.usb->udev;
 155         unsigned mask, val;
 156         int r;
 157 
 158         mask = tiocm_to_gigaset(old_state ^ new_state);
 159         val = tiocm_to_gigaset(new_state);
 160 
 161         gig_dbg(DEBUG_USBREQ, "set flags 0x%02x with mask 0x%02x", val, mask);
 162         r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 7, 0x41,
 163                             (val & 0xff) | ((mask & 0xff) << 8), 0,
 164                             NULL, 0, 2000 /* timeout? */);
 165         if (r < 0)
 166                 return r;
 167         return 0;
 168 }
 169 
 170 /*
 171  * Set M105 configuration value
 172  * using undocumented device commands reverse engineered from USB traces
 173  * of the Siemens Windows driver
 174  */
 175 static int set_value(struct cardstate *cs, u8 req, u16 val)
 176 {
 177         struct usb_device *udev = cs->hw.usb->udev;
 178         int r, r2;
 179 
 180         gig_dbg(DEBUG_USBREQ, "request %02x (%04x)",
 181                 (unsigned)req, (unsigned)val);
 182         r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x12, 0x41,
 183                             0xf /*?*/, 0, NULL, 0, 2000 /*?*/);
 184         /* no idea what this does */
 185         if (r < 0) {
 186                 dev_err(&udev->dev, "error %d on request 0x12\n", -r);
 187                 return r;
 188         }
 189 
 190         r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), req, 0x41,
 191                             val, 0, NULL, 0, 2000 /*?*/);
 192         if (r < 0)
 193                 dev_err(&udev->dev, "error %d on request 0x%02x\n",
 194                         -r, (unsigned)req);
 195 
 196         r2 = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x19, 0x41,
 197                              0, 0, cs->hw.usb->bchars, 6, 2000 /*?*/);
 198         if (r2 < 0)
 199                 dev_err(&udev->dev, "error %d on request 0x19\n", -r2);
 200 
 201         return r < 0 ? r : (r2 < 0 ? r2 : 0);
 202 }
 203 
 204 /*
 205  * set the baud rate on the internal serial adapter
 206  * using the undocumented parameter setting command
 207  */
 208 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
 209 {
 210         u16 val;
 211         u32 rate;
 212 
 213         cflag &= CBAUD;
 214 
 215         switch (cflag) {
 216         case    B300: rate =     300; break;
 217         case    B600: rate =     600; break;
 218         case   B1200: rate =    1200; break;
 219         case   B2400: rate =    2400; break;
 220         case   B4800: rate =    4800; break;
 221         case   B9600: rate =    9600; break;
 222         case  B19200: rate =   19200; break;
 223         case  B38400: rate =   38400; break;
 224         case  B57600: rate =   57600; break;
 225         case B115200: rate =  115200; break;
 226         default:
 227                 rate =  9600;
 228                 dev_err(cs->dev, "unsupported baudrate request 0x%x,"
 229                         " using default of B9600\n", cflag);
 230         }
 231 
 232         val = 0x383fff / rate + 1;
 233 
 234         return set_value(cs, 1, val);
 235 }
 236 
 237 /*
 238  * set the line format on the internal serial adapter
 239  * using the undocumented parameter setting command
 240  */
 241 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
 242 {
 243         u16 val = 0;
 244 
 245         /* set the parity */
 246         if (cflag & PARENB)
 247                 val |= (cflag & PARODD) ? 0x10 : 0x20;
 248 
 249         /* set the number of data bits */
 250         switch (cflag & CSIZE) {
 251         case CS5:
 252                 val |= 5 << 8; break;
 253         case CS6:
 254                 val |= 6 << 8; break;
 255         case CS7:
 256                 val |= 7 << 8; break;
 257         case CS8:
 258                 val |= 8 << 8; break;
 259         default:
 260                 dev_err(cs->dev, "CSIZE was not CS5-CS8, using default of 8\n");
 261                 val |= 8 << 8;
 262                 break;
 263         }
 264 
 265         /* set the number of stop bits */
 266         if (cflag & CSTOPB) {
 267                 if ((cflag & CSIZE) == CS5)
 268                         val |= 1; /* 1.5 stop bits */
 269                 else
 270                         val |= 2; /* 2 stop bits */
 271         }
 272 
 273         return set_value(cs, 3, val);
 274 }
 275 
 276 
 277 /*============================================================================*/
 278 static int gigaset_init_bchannel(struct bc_state *bcs)
 279 {
 280         /* nothing to do for M10x */
 281         gigaset_bchannel_up(bcs);
 282         return 0;
 283 }
 284 
 285 static int gigaset_close_bchannel(struct bc_state *bcs)
 286 {
 287         /* nothing to do for M10x */
 288         gigaset_bchannel_down(bcs);
 289         return 0;
 290 }
 291 
 292 static int write_modem(struct cardstate *cs);
 293 static int send_cb(struct cardstate *cs);
 294 
 295 
 296 /* Write tasklet handler: Continue sending current skb, or send command, or
 297  * start sending an skb from the send queue.
 298  */
 299 static void gigaset_modem_fill(unsigned long data)
 300 {
 301         struct cardstate *cs = (struct cardstate *) data;
 302         struct bc_state *bcs = &cs->bcs[0]; /* only one channel */
 303 
 304         gig_dbg(DEBUG_OUTPUT, "modem_fill");
 305 
 306         if (cs->hw.usb->busy) {
 307                 gig_dbg(DEBUG_OUTPUT, "modem_fill: busy");
 308                 return;
 309         }
 310 
 311 again:
 312         if (!bcs->tx_skb) {     /* no skb is being sent */
 313                 if (cs->cmdbuf) {       /* commands to send? */
 314                         gig_dbg(DEBUG_OUTPUT, "modem_fill: cb");
 315                         if (send_cb(cs) < 0) {
 316                                 gig_dbg(DEBUG_OUTPUT,
 317                                         "modem_fill: send_cb failed");
 318                                 goto again; /* no callback will be called! */
 319                         }
 320                         return;
 321                 }
 322 
 323                 /* skbs to send? */
 324                 bcs->tx_skb = skb_dequeue(&bcs->squeue);
 325                 if (!bcs->tx_skb)
 326                         return;
 327 
 328                 gig_dbg(DEBUG_INTR, "Dequeued skb (Adr: %lx)!",
 329                         (unsigned long) bcs->tx_skb);
 330         }
 331 
 332         gig_dbg(DEBUG_OUTPUT, "modem_fill: tx_skb");
 333         if (write_modem(cs) < 0) {
 334                 gig_dbg(DEBUG_OUTPUT, "modem_fill: write_modem failed");
 335                 goto again;     /* no callback will be called! */
 336         }
 337 }
 338 
 339 /*
 340  * Interrupt Input URB completion routine
 341  */
 342 static void gigaset_read_int_callback(struct urb *urb)
 343 {
 344         struct cardstate *cs = urb->context;
 345         struct inbuf_t *inbuf = cs->inbuf;
 346         int status = urb->status;
 347         int r;
 348         unsigned numbytes;
 349         unsigned char *src;
 350         unsigned long flags;
 351 
 352         if (!status) {
 353                 numbytes = urb->actual_length;
 354 
 355                 if (numbytes) {
 356                         src = cs->hw.usb->rcvbuf;
 357                         if (unlikely(*src))
 358                                 dev_warn(cs->dev,
 359                                          "%s: There was no leading 0, but 0x%02x!\n",
 360                                          __func__, (unsigned) *src);
 361                         ++src; /* skip leading 0x00 */
 362                         --numbytes;
 363                         if (gigaset_fill_inbuf(inbuf, src, numbytes)) {
 364                                 gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
 365                                 gigaset_schedule_event(inbuf->cs);
 366                         }
 367                 } else
 368                         gig_dbg(DEBUG_INTR, "Received zero block length");
 369         } else {
 370                 /* The urb might have been killed. */
 371                 gig_dbg(DEBUG_ANY, "%s - nonzero status received: %d",
 372                         __func__, status);
 373                 if (status == -ENOENT || status == -ESHUTDOWN)
 374                         /* killed or endpoint shutdown: don't resubmit */
 375                         return;
 376         }
 377 
 378         /* resubmit URB */
 379         spin_lock_irqsave(&cs->lock, flags);
 380         if (!cs->connected) {
 381                 spin_unlock_irqrestore(&cs->lock, flags);
 382                 pr_err("%s: disconnected\n", __func__);
 383                 return;
 384         }
 385         r = usb_submit_urb(urb, GFP_ATOMIC);
 386         spin_unlock_irqrestore(&cs->lock, flags);
 387         if (r)
 388                 dev_err(cs->dev, "error %d resubmitting URB\n", -r);
 389 }
 390 
 391 
 392 /* This callback routine is called when data was transmitted to the device. */
 393 static void gigaset_write_bulk_callback(struct urb *urb)
 394 {
 395         struct cardstate *cs = urb->context;
 396         int status = urb->status;
 397         unsigned long flags;
 398 
 399         switch (status) {
 400         case 0:                 /* normal completion */
 401                 break;
 402         case -ENOENT:           /* killed */
 403                 gig_dbg(DEBUG_ANY, "%s: killed", __func__);
 404                 cs->hw.usb->busy = 0;
 405                 return;
 406         default:
 407                 dev_err(cs->dev, "bulk transfer failed (status %d)\n",
 408                         -status);
 409                 /* That's all we can do. Communication problems
 410                    are handled by timeouts or network protocols. */
 411         }
 412 
 413         spin_lock_irqsave(&cs->lock, flags);
 414         if (!cs->connected) {
 415                 pr_err("%s: disconnected\n", __func__);
 416         } else {
 417                 cs->hw.usb->busy = 0;
 418                 tasklet_schedule(&cs->write_tasklet);
 419         }
 420         spin_unlock_irqrestore(&cs->lock, flags);
 421 }
 422 
 423 static int send_cb(struct cardstate *cs)
 424 {
 425         struct cmdbuf_t *cb = cs->cmdbuf;
 426         unsigned long flags;
 427         int count;
 428         int status = -ENOENT;
 429         struct usb_cardstate *ucs = cs->hw.usb;
 430 
 431         do {
 432                 if (!cb->len) {
 433                         spin_lock_irqsave(&cs->cmdlock, flags);
 434                         cs->cmdbytes -= cs->curlen;
 435                         gig_dbg(DEBUG_OUTPUT, "send_cb: sent %u bytes, %u left",
 436                                 cs->curlen, cs->cmdbytes);
 437                         cs->cmdbuf = cb->next;
 438                         if (cs->cmdbuf) {
 439                                 cs->cmdbuf->prev = NULL;
 440                                 cs->curlen = cs->cmdbuf->len;
 441                         } else {
 442                                 cs->lastcmdbuf = NULL;
 443                                 cs->curlen = 0;
 444                         }
 445                         spin_unlock_irqrestore(&cs->cmdlock, flags);
 446 
 447                         if (cb->wake_tasklet)
 448                                 tasklet_schedule(cb->wake_tasklet);
 449                         kfree(cb);
 450 
 451                         cb = cs->cmdbuf;
 452                 }
 453 
 454                 if (cb) {
 455                         count = min(cb->len, ucs->bulk_out_size);
 456                         gig_dbg(DEBUG_OUTPUT, "send_cb: send %d bytes", count);
 457 
 458                         usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev,
 459                                           usb_sndbulkpipe(ucs->udev,
 460                                                           ucs->bulk_out_epnum),
 461                                           cb->buf + cb->offset, count,
 462                                           gigaset_write_bulk_callback, cs);
 463 
 464                         cb->offset += count;
 465                         cb->len -= count;
 466                         ucs->busy = 1;
 467 
 468                         spin_lock_irqsave(&cs->lock, flags);
 469                         status = cs->connected ?
 470                                 usb_submit_urb(ucs->bulk_out_urb, GFP_ATOMIC) :
 471                                 -ENODEV;
 472                         spin_unlock_irqrestore(&cs->lock, flags);
 473 
 474                         if (status) {
 475                                 ucs->busy = 0;
 476                                 dev_err(cs->dev,
 477                                         "could not submit urb (error %d)\n",
 478                                         -status);
 479                                 cb->len = 0; /* skip urb => remove cb+wakeup
 480                                                 in next loop cycle */
 481                         }
 482                 }
 483         } while (cb && status); /* next command on error */
 484 
 485         return status;
 486 }
 487 
 488 /* Send command to device. */
 489 static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb)
 490 {
 491         unsigned long flags;
 492         int len;
 493 
 494         gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
 495                            DEBUG_TRANSCMD : DEBUG_LOCKCMD,
 496                            "CMD Transmit", cb->len, cb->buf);
 497 
 498         spin_lock_irqsave(&cs->cmdlock, flags);
 499         cb->prev = cs->lastcmdbuf;
 500         if (cs->lastcmdbuf)
 501                 cs->lastcmdbuf->next = cb;
 502         else {
 503                 cs->cmdbuf = cb;
 504                 cs->curlen = cb->len;
 505         }
 506         cs->cmdbytes += cb->len;
 507         cs->lastcmdbuf = cb;
 508         spin_unlock_irqrestore(&cs->cmdlock, flags);
 509 
 510         spin_lock_irqsave(&cs->lock, flags);
 511         len = cb->len;
 512         if (cs->connected)
 513                 tasklet_schedule(&cs->write_tasklet);
 514         spin_unlock_irqrestore(&cs->lock, flags);
 515         return len;
 516 }
 517 
 518 static int gigaset_write_room(struct cardstate *cs)
 519 {
 520         unsigned bytes;
 521 
 522         bytes = cs->cmdbytes;
 523         return bytes < IF_WRITEBUF ? IF_WRITEBUF - bytes : 0;
 524 }
 525 
 526 static int gigaset_chars_in_buffer(struct cardstate *cs)
 527 {
 528         return cs->cmdbytes;
 529 }
 530 
 531 /*
 532  * set the break characters on the internal serial adapter
 533  * using undocumented device commands reverse engineered from USB traces
 534  * of the Siemens Windows driver
 535  */
 536 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
 537 {
 538         struct usb_device *udev = cs->hw.usb->udev;
 539 
 540         gigaset_dbg_buffer(DEBUG_USBREQ, "brkchars", 6, buf);
 541         memcpy(cs->hw.usb->bchars, buf, 6);
 542         return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x19, 0x41,
 543                                0, 0, &buf, 6, 2000);
 544 }
 545 
 546 static void gigaset_freebcshw(struct bc_state *bcs)
 547 {
 548         /* unused */
 549 }
 550 
 551 /* Initialize the b-channel structure */
 552 static int gigaset_initbcshw(struct bc_state *bcs)
 553 {
 554         /* unused */
 555         bcs->hw.usb = NULL;
 556         return 0;
 557 }
 558 
 559 static void gigaset_reinitbcshw(struct bc_state *bcs)
 560 {
 561         /* nothing to do for M10x */
 562 }
 563 
 564 static void gigaset_freecshw(struct cardstate *cs)
 565 {
 566         tasklet_kill(&cs->write_tasklet);
 567         kfree(cs->hw.usb);
 568 }
 569 
 570 static int gigaset_initcshw(struct cardstate *cs)
 571 {
 572         struct usb_cardstate *ucs;
 573 
 574         cs->hw.usb = ucs = kzalloc(sizeof(struct usb_cardstate), GFP_KERNEL);
 575         if (!ucs) {
 576                 pr_err("out of memory\n");
 577                 return -ENOMEM;
 578         }
 579 
 580         ucs->bchars[0] = 0;
 581         ucs->bchars[1] = 0;
 582         ucs->bchars[2] = 0;
 583         ucs->bchars[3] = 0;
 584         ucs->bchars[4] = 0x11;
 585         ucs->bchars[5] = 0x13;
 586         tasklet_init(&cs->write_tasklet,
 587                      gigaset_modem_fill, (unsigned long) cs);
 588 
 589         return 0;
 590 }
 591 
 592 /* Send data from current skb to the device. */
 593 static int write_modem(struct cardstate *cs)
 594 {
 595         int ret = 0;
 596         int count;
 597         struct bc_state *bcs = &cs->bcs[0]; /* only one channel */
 598         struct usb_cardstate *ucs = cs->hw.usb;
 599         unsigned long flags;
 600 
 601         gig_dbg(DEBUG_OUTPUT, "len: %d...", bcs->tx_skb->len);
 602 
 603         if (!bcs->tx_skb->len) {
 604                 dev_kfree_skb_any(bcs->tx_skb);
 605                 bcs->tx_skb = NULL;
 606                 return -EINVAL;
 607         }
 608 
 609         /* Copy data to bulk out buffer and transmit data */
 610         count = min(bcs->tx_skb->len, (unsigned) ucs->bulk_out_size);
 611         skb_copy_from_linear_data(bcs->tx_skb, ucs->bulk_out_buffer, count);
 612         skb_pull(bcs->tx_skb, count);
 613         ucs->busy = 1;
 614         gig_dbg(DEBUG_OUTPUT, "write_modem: send %d bytes", count);
 615 
 616         spin_lock_irqsave(&cs->lock, flags);
 617         if (cs->connected) {
 618                 usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev,
 619                                   usb_sndbulkpipe(ucs->udev,
 620                                                   ucs->bulk_out_epnum),
 621                                   ucs->bulk_out_buffer, count,
 622                                   gigaset_write_bulk_callback, cs);
 623                 ret = usb_submit_urb(ucs->bulk_out_urb, GFP_ATOMIC);
 624         } else {
 625                 ret = -ENODEV;
 626         }
 627         spin_unlock_irqrestore(&cs->lock, flags);
 628 
 629         if (ret) {
 630                 dev_err(cs->dev, "could not submit urb (error %d)\n", -ret);
 631                 ucs->busy = 0;
 632         }
 633 
 634         if (!bcs->tx_skb->len) {
 635                 /* skb sent completely */
 636                 gigaset_skb_sent(bcs, bcs->tx_skb);
 637 
 638                 gig_dbg(DEBUG_INTR, "kfree skb (Adr: %lx)!",
 639                         (unsigned long) bcs->tx_skb);
 640                 dev_kfree_skb_any(bcs->tx_skb);
 641                 bcs->tx_skb = NULL;
 642         }
 643 
 644         return ret;
 645 }
 646 
 647 static int gigaset_probe(struct usb_interface *interface,
 648                          const struct usb_device_id *id)
 649 {
 650         int retval;
 651         struct usb_device *udev = interface_to_usbdev(interface);
 652         struct usb_host_interface *hostif = interface->cur_altsetting;
 653         struct cardstate *cs = NULL;
 654         struct usb_cardstate *ucs = NULL;
 655         struct usb_endpoint_descriptor *endpoint;
 656         int buffer_size;
 657 
 658         gig_dbg(DEBUG_ANY, "%s: Check if device matches ...", __func__);
 659 
 660         /* See if the device offered us matches what we can accept */
 661         if ((le16_to_cpu(udev->descriptor.idVendor)  != USB_M105_VENDOR_ID) ||
 662             (le16_to_cpu(udev->descriptor.idProduct) != USB_M105_PRODUCT_ID)) {
 663                 gig_dbg(DEBUG_ANY, "device ID (0x%x, 0x%x) not for me - skip",
 664                         le16_to_cpu(udev->descriptor.idVendor),
 665                         le16_to_cpu(udev->descriptor.idProduct));
 666                 return -ENODEV;
 667         }
 668         if (hostif->desc.bInterfaceNumber != 0) {
 669                 gig_dbg(DEBUG_ANY, "interface %d not for me - skip",
 670                         hostif->desc.bInterfaceNumber);
 671                 return -ENODEV;
 672         }
 673         if (hostif->desc.bAlternateSetting != 0) {
 674                 dev_notice(&udev->dev, "unsupported altsetting %d - skip",
 675                            hostif->desc.bAlternateSetting);
 676                 return -ENODEV;
 677         }
 678         if (hostif->desc.bInterfaceClass != 255) {
 679                 dev_notice(&udev->dev, "unsupported interface class %d - skip",
 680                            hostif->desc.bInterfaceClass);
 681                 return -ENODEV;
 682         }
 683 
 684         if (hostif->desc.bNumEndpoints < 2) {
 685                 dev_err(&interface->dev, "missing endpoints\n");
 686                 return -ENODEV;
 687         }
 688 
 689         dev_info(&udev->dev, "%s: Device matched ... !\n", __func__);
 690 
 691         /* allocate memory for our device state and initialize it */
 692         cs = gigaset_initcs(driver, 1, 1, 0, cidmode, GIGASET_MODULENAME);
 693         if (!cs)
 694                 return -ENODEV;
 695         ucs = cs->hw.usb;
 696 
 697         /* save off device structure ptrs for later use */
 698         usb_get_dev(udev);
 699         ucs->udev = udev;
 700         ucs->interface = interface;
 701         cs->dev = &interface->dev;
 702 
 703         /* save address of controller structure */
 704         usb_set_intfdata(interface, cs);
 705 
 706         endpoint = &hostif->endpoint[0].desc;
 707 
 708         if (!usb_endpoint_is_bulk_out(endpoint)) {
 709                 dev_err(&interface->dev, "missing bulk-out endpoint\n");
 710                 retval = -ENODEV;
 711                 goto error;
 712         }
 713 
 714         buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 715         ucs->bulk_out_size = buffer_size;
 716         ucs->bulk_out_epnum = usb_endpoint_num(endpoint);
 717         ucs->bulk_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
 718         if (!ucs->bulk_out_buffer) {
 719                 dev_err(cs->dev, "Couldn't allocate bulk_out_buffer\n");
 720                 retval = -ENOMEM;
 721                 goto error;
 722         }
 723 
 724         ucs->bulk_out_urb = usb_alloc_urb(0, GFP_KERNEL);
 725         if (!ucs->bulk_out_urb) {
 726                 dev_err(cs->dev, "Couldn't allocate bulk_out_urb\n");
 727                 retval = -ENOMEM;
 728                 goto error;
 729         }
 730 
 731         endpoint = &hostif->endpoint[1].desc;
 732 
 733         if (!usb_endpoint_is_int_in(endpoint)) {
 734                 dev_err(&interface->dev, "missing int-in endpoint\n");
 735                 retval = -ENODEV;
 736                 goto error;
 737         }
 738 
 739         ucs->busy = 0;
 740 
 741         ucs->read_urb = usb_alloc_urb(0, GFP_KERNEL);
 742         if (!ucs->read_urb) {
 743                 dev_err(cs->dev, "No free urbs available\n");
 744                 retval = -ENOMEM;
 745                 goto error;
 746         }
 747         buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
 748         ucs->rcvbuf_size = buffer_size;
 749         ucs->rcvbuf = kmalloc(buffer_size, GFP_KERNEL);
 750         if (!ucs->rcvbuf) {
 751                 dev_err(cs->dev, "Couldn't allocate rcvbuf\n");
 752                 retval = -ENOMEM;
 753                 goto error;
 754         }
 755         /* Fill the interrupt urb and send it to the core */
 756         usb_fill_int_urb(ucs->read_urb, udev,
 757                          usb_rcvintpipe(udev, usb_endpoint_num(endpoint)),
 758                          ucs->rcvbuf, buffer_size,
 759                          gigaset_read_int_callback,
 760                          cs, endpoint->bInterval);
 761 
 762         retval = usb_submit_urb(ucs->read_urb, GFP_KERNEL);
 763         if (retval) {
 764                 dev_err(cs->dev, "Could not submit URB (error %d)\n", -retval);
 765                 goto error;
 766         }
 767 
 768         /* tell common part that the device is ready */
 769         if (startmode == SM_LOCKED)
 770                 cs->mstate = MS_LOCKED;
 771 
 772         retval = gigaset_start(cs);
 773         if (retval < 0) {
 774                 tasklet_kill(&cs->write_tasklet);
 775                 goto error;
 776         }
 777         return 0;
 778 
 779 error:
 780         usb_kill_urb(ucs->read_urb);
 781         kfree(ucs->bulk_out_buffer);
 782         usb_free_urb(ucs->bulk_out_urb);
 783         kfree(ucs->rcvbuf);
 784         usb_free_urb(ucs->read_urb);
 785         usb_set_intfdata(interface, NULL);
 786         ucs->read_urb = ucs->bulk_out_urb = NULL;
 787         ucs->rcvbuf = ucs->bulk_out_buffer = NULL;
 788         usb_put_dev(ucs->udev);
 789         ucs->udev = NULL;
 790         ucs->interface = NULL;
 791         gigaset_freecs(cs);
 792         return retval;
 793 }
 794 
 795 static void gigaset_disconnect(struct usb_interface *interface)
 796 {
 797         struct cardstate *cs;
 798         struct usb_cardstate *ucs;
 799 
 800         cs = usb_get_intfdata(interface);
 801         ucs = cs->hw.usb;
 802 
 803         dev_info(cs->dev, "disconnecting Gigaset USB adapter\n");
 804 
 805         usb_kill_urb(ucs->read_urb);
 806 
 807         gigaset_stop(cs);
 808 
 809         usb_set_intfdata(interface, NULL);
 810         tasklet_kill(&cs->write_tasklet);
 811 
 812         usb_kill_urb(ucs->bulk_out_urb);
 813 
 814         kfree(ucs->bulk_out_buffer);
 815         usb_free_urb(ucs->bulk_out_urb);
 816         kfree(ucs->rcvbuf);
 817         usb_free_urb(ucs->read_urb);
 818         ucs->read_urb = ucs->bulk_out_urb = NULL;
 819         ucs->rcvbuf = ucs->bulk_out_buffer = NULL;
 820 
 821         usb_put_dev(ucs->udev);
 822         ucs->interface = NULL;
 823         ucs->udev = NULL;
 824         cs->dev = NULL;
 825         gigaset_freecs(cs);
 826 }
 827 
 828 /* gigaset_suspend
 829  * This function is called before the USB connection is suspended or reset.
 830  */
 831 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
 832 {
 833         struct cardstate *cs = usb_get_intfdata(intf);
 834 
 835         /* stop activity */
 836         cs->connected = 0;      /* prevent rescheduling */
 837         usb_kill_urb(cs->hw.usb->read_urb);
 838         tasklet_kill(&cs->write_tasklet);
 839         usb_kill_urb(cs->hw.usb->bulk_out_urb);
 840 
 841         gig_dbg(DEBUG_SUSPEND, "suspend complete");
 842         return 0;
 843 }
 844 
 845 /* gigaset_resume
 846  * This function is called after the USB connection has been resumed or reset.
 847  */
 848 static int gigaset_resume(struct usb_interface *intf)
 849 {
 850         struct cardstate *cs = usb_get_intfdata(intf);
 851         int rc;
 852 
 853         /* resubmit interrupt URB */
 854         cs->connected = 1;
 855         rc = usb_submit_urb(cs->hw.usb->read_urb, GFP_KERNEL);
 856         if (rc) {
 857                 dev_err(cs->dev, "Could not submit read URB (error %d)\n", -rc);
 858                 return rc;
 859         }
 860 
 861         gig_dbg(DEBUG_SUSPEND, "resume complete");
 862         return 0;
 863 }
 864 
 865 /* gigaset_pre_reset
 866  * This function is called before the USB connection is reset.
 867  */
 868 static int gigaset_pre_reset(struct usb_interface *intf)
 869 {
 870         /* same as suspend */
 871         return gigaset_suspend(intf, PMSG_ON);
 872 }
 873 
 874 static const struct gigaset_ops ops = {
 875         .write_cmd = gigaset_write_cmd,
 876         .write_room = gigaset_write_room,
 877         .chars_in_buffer = gigaset_chars_in_buffer,
 878         .brkchars = gigaset_brkchars,
 879         .init_bchannel = gigaset_init_bchannel,
 880         .close_bchannel = gigaset_close_bchannel,
 881         .initbcshw = gigaset_initbcshw,
 882         .freebcshw = gigaset_freebcshw,
 883         .reinitbcshw = gigaset_reinitbcshw,
 884         .initcshw = gigaset_initcshw,
 885         .freecshw = gigaset_freecshw,
 886         .set_modem_ctrl = gigaset_set_modem_ctrl,
 887         .baud_rate = gigaset_baud_rate,
 888         .set_line_ctrl = gigaset_set_line_ctrl,
 889         .send_skb = gigaset_m10x_send_skb,
 890         .handle_input = gigaset_m10x_input,
 891 };
 892 
 893 /*
 894  * This function is called while kernel-module is loaded
 895  */
 896 static int __init usb_gigaset_init(void)
 897 {
 898         int result;
 899 
 900         /* allocate memory for our driver state and initialize it */
 901         driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
 902                                     GIGASET_MODULENAME, GIGASET_DEVNAME,
 903                                     &ops, THIS_MODULE);
 904         if (driver == NULL) {
 905                 result = -ENOMEM;
 906                 goto error;
 907         }
 908 
 909         /* register this driver with the USB subsystem */
 910         result = usb_register(&gigaset_usb_driver);
 911         if (result < 0) {
 912                 pr_err("error %d registering USB driver\n", -result);
 913                 goto error;
 914         }
 915 
 916         pr_info(DRIVER_DESC "\n");
 917         return 0;
 918 
 919 error:
 920         if (driver)
 921                 gigaset_freedriver(driver);
 922         driver = NULL;
 923         return result;
 924 }
 925 
 926 /*
 927  * This function is called while unloading the kernel-module
 928  */
 929 static void __exit usb_gigaset_exit(void)
 930 {
 931         int i;
 932 
 933         gigaset_blockdriver(driver); /* => probe will fail
 934                                       * => no gigaset_start any more
 935                                       */
 936 
 937         /* stop all connected devices */
 938         for (i = 0; i < driver->minors; i++)
 939                 gigaset_shutdown(driver->cs + i);
 940 
 941         /* from now on, no isdn callback should be possible */
 942 
 943         /* deregister this driver with the USB subsystem */
 944         usb_deregister(&gigaset_usb_driver);
 945         /* this will call the disconnect-callback */
 946         /* from now on, no disconnect/probe callback should be running */
 947 
 948         gigaset_freedriver(driver);
 949         driver = NULL;
 950 }
 951 
 952 
 953 module_init(usb_gigaset_init);
 954 module_exit(usb_gigaset_exit);
 955 
 956 MODULE_AUTHOR(DRIVER_AUTHOR);
 957 MODULE_DESCRIPTION(DRIVER_DESC);
 958 
 959 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/staging/isdn/gigaset/usb-gigaset.c

DEFINITIONS
