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

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