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usb_gigaset: don't kmalloc(0)
[deliverable/linux.git] / 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 static int gigaset_probe(struct usb_interface *interface,
108 const struct usb_device_id *id);
109 static void gigaset_disconnect(struct usb_interface *interface);
110
111 static struct gigaset_driver *driver = NULL;
112 static struct cardstate *cardstate = NULL;
113
114 /* usb specific object needed to register this driver with the usb subsystem */
115 static struct usb_driver gigaset_usb_driver = {
116 .name = GIGASET_MODULENAME,
117 .probe = gigaset_probe,
118 .disconnect = gigaset_disconnect,
119 .id_table = gigaset_table,
120 };
121
122 struct usb_cardstate {
123 struct usb_device *udev; /* usb device pointer */
124 struct usb_interface *interface; /* interface for this device */
125 atomic_t busy; /* bulk output in progress */
126
127 /* Output buffer */
128 unsigned char *bulk_out_buffer;
129 int bulk_out_size;
130 __u8 bulk_out_endpointAddr;
131 struct urb *bulk_out_urb;
132
133 /* Input buffer */
134 int rcvbuf_size;
135 struct urb *read_urb;
136 __u8 int_in_endpointAddr;
137
138 char bchars[6]; /* for request 0x19 */
139 };
140
141 static inline unsigned tiocm_to_gigaset(unsigned state)
142 {
143 return ((state & TIOCM_DTR) ? 1 : 0) | ((state & TIOCM_RTS) ? 2 : 0);
144 }
145
146 #ifdef CONFIG_GIGASET_UNDOCREQ
147 /* WARNING: EXPERIMENTAL! */
148 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
149 unsigned new_state)
150 {
151 struct usb_device *udev = cs->hw.usb->udev;
152 unsigned mask, val;
153 int r;
154
155 mask = tiocm_to_gigaset(old_state ^ new_state);
156 val = tiocm_to_gigaset(new_state);
157
158 gig_dbg(DEBUG_USBREQ, "set flags 0x%02x with mask 0x%02x", val, mask);
159 // don't use this in an interrupt/BH
160 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 7, 0x41,
161 (val & 0xff) | ((mask & 0xff) << 8), 0,
162 NULL, 0, 2000 /* timeout? */);
163 if (r < 0)
164 return r;
165 //..
166 return 0;
167 }
168
169 static int set_value(struct cardstate *cs, u8 req, u16 val)
170 {
171 struct usb_device *udev = cs->hw.usb->udev;
172 int r, r2;
173
174 gig_dbg(DEBUG_USBREQ, "request %02x (%04x)",
175 (unsigned)req, (unsigned)val);
176 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x12, 0x41,
177 0xf /*?*/, 0, NULL, 0, 2000 /*?*/);
178 /* no idea what this does */
179 if (r < 0) {
180 dev_err(&udev->dev, "error %d on request 0x12\n", -r);
181 return r;
182 }
183
184 r = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), req, 0x41,
185 val, 0, NULL, 0, 2000 /*?*/);
186 if (r < 0)
187 dev_err(&udev->dev, "error %d on request 0x%02x\n",
188 -r, (unsigned)req);
189
190 r2 = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x19, 0x41,
191 0, 0, cs->hw.usb->bchars, 6, 2000 /*?*/);
192 if (r2 < 0)
193 dev_err(&udev->dev, "error %d on request 0x19\n", -r2);
194
195 return r < 0 ? r : (r2 < 0 ? r2 : 0);
196 }
197
198 /* WARNING: HIGHLY EXPERIMENTAL! */
199 // don't use this in an interrupt/BH
200 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
201 {
202 u16 val;
203 u32 rate;
204
205 cflag &= CBAUD;
206
207 switch (cflag) {
208 //FIXME more values?
209 case B300: rate = 300; break;
210 case B600: rate = 600; break;
211 case B1200: rate = 1200; break;
212 case B2400: rate = 2400; break;
213 case B4800: rate = 4800; break;
214 case B9600: rate = 9600; break;
215 case B19200: rate = 19200; break;
216 case B38400: rate = 38400; break;
217 case B57600: rate = 57600; break;
218 case B115200: rate = 115200; break;
219 default:
220 rate = 9600;
221 dev_err(cs->dev, "unsupported baudrate request 0x%x,"
222 " using default of B9600\n", cflag);
223 }
224
225 val = 0x383fff / rate + 1;
226
227 return set_value(cs, 1, val);
228 }
229
230 /* WARNING: HIGHLY EXPERIMENTAL! */
231 // don't use this in an interrupt/BH
232 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
233 {
234 u16 val = 0;
235
236 /* set the parity */
237 if (cflag & PARENB)
238 val |= (cflag & PARODD) ? 0x10 : 0x20;
239
240 /* set the number of data bits */
241 switch (cflag & CSIZE) {
242 case CS5:
243 val |= 5 << 8; break;
244 case CS6:
245 val |= 6 << 8; break;
246 case CS7:
247 val |= 7 << 8; break;
248 case CS8:
249 val |= 8 << 8; break;
250 default:
251 dev_err(cs->dev, "CSIZE was not CS5-CS8, using default of 8\n");
252 val |= 8 << 8;
253 break;
254 }
255
256 /* set the number of stop bits */
257 if (cflag & CSTOPB) {
258 if ((cflag & CSIZE) == CS5)
259 val |= 1; /* 1.5 stop bits */ //FIXME is this okay?
260 else
261 val |= 2; /* 2 stop bits */
262 }
263
264 return set_value(cs, 3, val);
265 }
266
267 #else
268 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
269 unsigned new_state)
270 {
271 return -EINVAL;
272 }
273
274 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
275 {
276 return -EINVAL;
277 }
278
279 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
280 {
281 return -EINVAL;
282 }
283 #endif
284
285
286 /*================================================================================================================*/
287 static int gigaset_init_bchannel(struct bc_state *bcs)
288 {
289 /* nothing to do for M10x */
290 gigaset_bchannel_up(bcs);
291 return 0;
292 }
293
294 static int gigaset_close_bchannel(struct bc_state *bcs)
295 {
296 /* nothing to do for M10x */
297 gigaset_bchannel_down(bcs);
298 return 0;
299 }
300
301 static int write_modem(struct cardstate *cs);
302 static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb);
303
304
305 /* Write tasklet handler: Continue sending current skb, or send command, or
306 * start sending an skb from the send queue.
307 */
308 static void gigaset_modem_fill(unsigned long data)
309 {
310 struct cardstate *cs = (struct cardstate *) data;
311 struct bc_state *bcs = &cs->bcs[0]; /* only one channel */
312 struct cmdbuf_t *cb;
313 unsigned long flags;
314 int again;
315
316 gig_dbg(DEBUG_OUTPUT, "modem_fill");
317
318 if (atomic_read(&cs->hw.usb->busy)) {
319 gig_dbg(DEBUG_OUTPUT, "modem_fill: busy");
320 return;
321 }
322
323 do {
324 again = 0;
325 if (!bcs->tx_skb) { /* no skb is being sent */
326 spin_lock_irqsave(&cs->cmdlock, flags);
327 cb = cs->cmdbuf;
328 spin_unlock_irqrestore(&cs->cmdlock, flags);
329 if (cb) { /* commands to send? */
330 gig_dbg(DEBUG_OUTPUT, "modem_fill: cb");
331 if (send_cb(cs, cb) < 0) {
332 gig_dbg(DEBUG_OUTPUT,
333 "modem_fill: send_cb failed");
334 again = 1; /* no callback will be
335 called! */
336 }
337 } else { /* skbs to send? */
338 bcs->tx_skb = skb_dequeue(&bcs->squeue);
339 if (bcs->tx_skb)
340 gig_dbg(DEBUG_INTR,
341 "Dequeued skb (Adr: %lx)!",
342 (unsigned long) bcs->tx_skb);
343 }
344 }
345
346 if (bcs->tx_skb) {
347 gig_dbg(DEBUG_OUTPUT, "modem_fill: tx_skb");
348 if (write_modem(cs) < 0) {
349 gig_dbg(DEBUG_OUTPUT,
350 "modem_fill: write_modem failed");
351 // FIXME should we tell the LL?
352 again = 1; /* no callback will be called! */
353 }
354 }
355 } while (again);
356 }
357
358 /**
359 * gigaset_read_int_callback
360 *
361 * It is called if the data was received from the device.
362 */
363 static void gigaset_read_int_callback(struct urb *urb)
364 {
365 struct inbuf_t *inbuf = urb->context;
366 struct cardstate *cs = inbuf->cs;
367 int resubmit = 0;
368 int r;
369 unsigned numbytes;
370 unsigned char *src;
371 unsigned long flags;
372
373 if (!urb->status) {
374 if (!cs->connected) {
375 err("%s: disconnected", __func__); /* should never happen */
376 return;
377 }
378
379 numbytes = urb->actual_length;
380
381 if (numbytes) {
382 src = inbuf->rcvbuf;
383 if (unlikely(*src))
384 dev_warn(cs->dev,
385 "%s: There was no leading 0, but 0x%02x!\n",
386 __func__, (unsigned) *src);
387 ++src; /* skip leading 0x00 */
388 --numbytes;
389 if (gigaset_fill_inbuf(inbuf, src, numbytes)) {
390 gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
391 gigaset_schedule_event(inbuf->cs);
392 }
393 } else
394 gig_dbg(DEBUG_INTR, "Received zero block length");
395 resubmit = 1;
396 } else {
397 /* The urb might have been killed. */
398 gig_dbg(DEBUG_ANY, "%s - nonzero read bulk status received: %d",
399 __func__, urb->status);
400 if (urb->status != -ENOENT) { /* not killed */
401 if (!cs->connected) {
402 err("%s: disconnected", __func__); /* should never happen */
403 return;
404 }
405 resubmit = 1;
406 }
407 }
408
409 if (resubmit) {
410 spin_lock_irqsave(&cs->lock, flags);
411 r = cs->connected ? usb_submit_urb(urb, GFP_ATOMIC) : -ENODEV;
412 spin_unlock_irqrestore(&cs->lock, flags);
413 if (r)
414 dev_err(cs->dev, "error %d when resubmitting urb.\n",
415 -r);
416 }
417 }
418
419
420 /* This callback routine is called when data was transmitted to the device. */
421 static void gigaset_write_bulk_callback(struct urb *urb)
422 {
423 struct cardstate *cs = urb->context;
424 unsigned long flags;
425
426 if (urb->status)
427 dev_err(cs->dev, "bulk transfer failed (status %d)\n",
428 -urb->status);
429 /* That's all we can do. Communication problems
430 are handled by timeouts or network protocols. */
431
432 spin_lock_irqsave(&cs->lock, flags);
433 if (!cs->connected) {
434 err("%s: not connected", __func__);
435 } else {
436 atomic_set(&cs->hw.usb->busy, 0);
437 tasklet_schedule(&cs->write_tasklet);
438 }
439 spin_unlock_irqrestore(&cs->lock, flags);
440 }
441
442 static int send_cb(struct cardstate *cs, struct cmdbuf_t *cb)
443 {
444 struct cmdbuf_t *tcb;
445 unsigned long flags;
446 int count;
447 int status = -ENOENT; // FIXME
448 struct usb_cardstate *ucs = cs->hw.usb;
449
450 do {
451 if (!cb->len) {
452 tcb = cb;
453
454 spin_lock_irqsave(&cs->cmdlock, flags);
455 cs->cmdbytes -= cs->curlen;
456 gig_dbg(DEBUG_OUTPUT, "send_cb: sent %u bytes, %u left",
457 cs->curlen, cs->cmdbytes);
458 cs->cmdbuf = cb = cb->next;
459 if (cb) {
460 cb->prev = NULL;
461 cs->curlen = cb->len;
462 } else {
463 cs->lastcmdbuf = NULL;
464 cs->curlen = 0;
465 }
466 spin_unlock_irqrestore(&cs->cmdlock, flags);
467
468 if (tcb->wake_tasklet)
469 tasklet_schedule(tcb->wake_tasklet);
470 kfree(tcb);
471 }
472 if (cb) {
473 count = min(cb->len, ucs->bulk_out_size);
474 gig_dbg(DEBUG_OUTPUT, "send_cb: send %d bytes", count);
475
476 usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev,
477 usb_sndbulkpipe(ucs->udev,
478 ucs->bulk_out_endpointAddr & 0x0f),
479 cb->buf + cb->offset, count,
480 gigaset_write_bulk_callback, cs);
481
482 cb->offset += count;
483 cb->len -= count;
484 atomic_set(&ucs->busy, 1);
485
486 spin_lock_irqsave(&cs->lock, flags);
487 status = cs->connected ? usb_submit_urb(ucs->bulk_out_urb, GFP_ATOMIC) : -ENODEV;
488 spin_unlock_irqrestore(&cs->lock, flags);
489
490 if (status) {
491 atomic_set(&ucs->busy, 0);
492 err("could not submit urb (error %d)\n",
493 -status);
494 cb->len = 0; /* skip urb => remove cb+wakeup
495 in next loop cycle */
496 }
497 }
498 } while (cb && status); /* next command on error */
499
500 return status;
501 }
502
503 /* Send command to device. */
504 static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf,
505 int len, struct tasklet_struct *wake_tasklet)
506 {
507 struct cmdbuf_t *cb;
508 unsigned long flags;
509
510 gigaset_dbg_buffer(atomic_read(&cs->mstate) != MS_LOCKED ?
511 DEBUG_TRANSCMD : DEBUG_LOCKCMD,
512 "CMD Transmit", len, buf);
513
514 if (len <= 0)
515 return 0;
516
517 if (!(cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC))) {
518 dev_err(cs->dev, "%s: out of memory\n", __func__);
519 return -ENOMEM;
520 }
521
522 memcpy(cb->buf, buf, len);
523 cb->len = len;
524 cb->offset = 0;
525 cb->next = NULL;
526 cb->wake_tasklet = wake_tasklet;
527
528 spin_lock_irqsave(&cs->cmdlock, flags);
529 cb->prev = cs->lastcmdbuf;
530 if (cs->lastcmdbuf)
531 cs->lastcmdbuf->next = cb;
532 else {
533 cs->cmdbuf = cb;
534 cs->curlen = len;
535 }
536 cs->cmdbytes += len;
537 cs->lastcmdbuf = cb;
538 spin_unlock_irqrestore(&cs->cmdlock, flags);
539
540 spin_lock_irqsave(&cs->lock, flags);
541 if (cs->connected)
542 tasklet_schedule(&cs->write_tasklet);
543 spin_unlock_irqrestore(&cs->lock, flags);
544 return len;
545 }
546
547 static int gigaset_write_room(struct cardstate *cs)
548 {
549 unsigned long flags;
550 unsigned bytes;
551
552 spin_lock_irqsave(&cs->cmdlock, flags);
553 bytes = cs->cmdbytes;
554 spin_unlock_irqrestore(&cs->cmdlock, flags);
555
556 return bytes < IF_WRITEBUF ? IF_WRITEBUF - bytes : 0;
557 }
558
559 static int gigaset_chars_in_buffer(struct cardstate *cs)
560 {
561 return cs->cmdbytes;
562 }
563
564 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
565 {
566 #ifdef CONFIG_GIGASET_UNDOCREQ
567 struct usb_device *udev = cs->hw.usb->udev;
568
569 gigaset_dbg_buffer(DEBUG_USBREQ, "brkchars", 6, buf);
570 memcpy(cs->hw.usb->bchars, buf, 6);
571 return usb_control_msg(udev, usb_sndctrlpipe(udev, 0), 0x19, 0x41,
572 0, 0, &buf, 6, 2000);
573 #else
574 return -EINVAL;
575 #endif
576 }
577
578 static int gigaset_freebcshw(struct bc_state *bcs)
579 {
580 /* unused */
581 return 1;
582 }
583
584 /* Initialize the b-channel structure */
585 static int gigaset_initbcshw(struct bc_state *bcs)
586 {
587 /* unused */
588 bcs->hw.usb = NULL;
589 return 1;
590 }
591
592 static void gigaset_reinitbcshw(struct bc_state *bcs)
593 {
594 /* nothing to do for M10x */
595 }
596
597 static void gigaset_freecshw(struct cardstate *cs)
598 {
599 tasklet_kill(&cs->write_tasklet);
600 kfree(cs->hw.usb);
601 }
602
603 static int gigaset_initcshw(struct cardstate *cs)
604 {
605 struct usb_cardstate *ucs;
606
607 cs->hw.usb = ucs =
608 kmalloc(sizeof(struct usb_cardstate), GFP_KERNEL);
609 if (!ucs)
610 return 0;
611
612 ucs->bchars[0] = 0;
613 ucs->bchars[1] = 0;
614 ucs->bchars[2] = 0;
615 ucs->bchars[3] = 0;
616 ucs->bchars[4] = 0x11;
617 ucs->bchars[5] = 0x13;
618 ucs->bulk_out_buffer = NULL;
619 ucs->bulk_out_urb = NULL;
620 //ucs->urb_cmd_out = NULL;
621 ucs->read_urb = NULL;
622 tasklet_init(&cs->write_tasklet,
623 &gigaset_modem_fill, (unsigned long) cs);
624
625 return 1;
626 }
627
628 /* Send data from current skb to the device. */
629 static int write_modem(struct cardstate *cs)
630 {
631 int ret = 0;
632 int count;
633 struct bc_state *bcs = &cs->bcs[0]; /* only one channel */
634 struct usb_cardstate *ucs = cs->hw.usb;
635 unsigned long flags;
636
637 gig_dbg(DEBUG_WRITE, "len: %d...", bcs->tx_skb->len);
638
639 if (!bcs->tx_skb->len) {
640 dev_kfree_skb_any(bcs->tx_skb);
641 bcs->tx_skb = NULL;
642 return -EINVAL;
643 }
644
645 /* Copy data to bulk out buffer and // FIXME copying not necessary
646 * transmit data
647 */
648 count = min(bcs->tx_skb->len, (unsigned) ucs->bulk_out_size);
649 skb_copy_from_linear_data(bcs->tx_skb, ucs->bulk_out_buffer, count);
650 skb_pull(bcs->tx_skb, count);
651 atomic_set(&ucs->busy, 1);
652 gig_dbg(DEBUG_OUTPUT, "write_modem: send %d bytes", count);
653
654 spin_lock_irqsave(&cs->lock, flags);
655 if (cs->connected) {
656 usb_fill_bulk_urb(ucs->bulk_out_urb, ucs->udev,
657 usb_sndbulkpipe(ucs->udev,
658 ucs->bulk_out_endpointAddr & 0x0f),
659 ucs->bulk_out_buffer, count,
660 gigaset_write_bulk_callback, cs);
661 ret = usb_submit_urb(ucs->bulk_out_urb, GFP_ATOMIC);
662 } else {
663 ret = -ENODEV;
664 }
665 spin_unlock_irqrestore(&cs->lock, flags);
666
667 if (ret) {
668 err("could not submit urb (error %d)\n", -ret);
669 atomic_set(&ucs->busy, 0);
670 }
671
672 if (!bcs->tx_skb->len) {
673 /* skb sent completely */
674 gigaset_skb_sent(bcs, bcs->tx_skb); //FIXME also, when ret<0?
675
676 gig_dbg(DEBUG_INTR, "kfree skb (Adr: %lx)!",
677 (unsigned long) bcs->tx_skb);
678 dev_kfree_skb_any(bcs->tx_skb);
679 bcs->tx_skb = NULL;
680 }
681
682 return ret;
683 }
684
685 static int gigaset_probe(struct usb_interface *interface,
686 const struct usb_device_id *id)
687 {
688 int retval;
689 struct usb_device *udev = interface_to_usbdev(interface);
690 unsigned int ifnum;
691 struct usb_host_interface *hostif;
692 struct cardstate *cs = NULL;
693 struct usb_cardstate *ucs = NULL;
694 struct usb_endpoint_descriptor *endpoint;
695 int buffer_size;
696 int alt;
697
698 gig_dbg(DEBUG_ANY,
699 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
700 __func__, le16_to_cpu(udev->descriptor.idVendor),
701 le16_to_cpu(udev->descriptor.idProduct));
702
703 retval = -ENODEV; //FIXME
704
705 /* See if the device offered us matches what we can accept */
706 if ((le16_to_cpu(udev->descriptor.idVendor) != USB_M105_VENDOR_ID) ||
707 (le16_to_cpu(udev->descriptor.idProduct) != USB_M105_PRODUCT_ID))
708 return -ENODEV;
709
710 /* this starts to become ascii art... */
711 hostif = interface->cur_altsetting;
712 alt = hostif->desc.bAlternateSetting;
713 ifnum = hostif->desc.bInterfaceNumber; // FIXME ?
714
715 if (alt != 0 || ifnum != 0) {
716 dev_warn(&udev->dev, "ifnum %d, alt %d\n", ifnum, alt);
717 return -ENODEV;
718 }
719
720 /* Reject application specific intefaces
721 *
722 */
723 if (hostif->desc.bInterfaceClass != 255) {
724 dev_info(&udev->dev,
725 "%s: Device matched but iface_desc[%d]->bInterfaceClass==%d!\n",
726 __func__, ifnum, hostif->desc.bInterfaceClass);
727 return -ENODEV;
728 }
729
730 dev_info(&udev->dev, "%s: Device matched ... !\n", __func__);
731
732 cs = gigaset_getunassignedcs(driver);
733 if (!cs) {
734 dev_warn(&udev->dev, "no free cardstate\n");
735 return -ENODEV;
736 }
737 ucs = cs->hw.usb;
738
739 /* save off device structure ptrs for later use */
740 usb_get_dev(udev);
741 ucs->udev = udev;
742 ucs->interface = interface;
743 cs->dev = &interface->dev;
744
745 /* save address of controller structure */
746 usb_set_intfdata(interface, cs); // dev_set_drvdata(&interface->dev, cs);
747
748 endpoint = &hostif->endpoint[0].desc;
749
750 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
751 ucs->bulk_out_size = buffer_size;
752 ucs->bulk_out_endpointAddr = endpoint->bEndpointAddress;
753 ucs->bulk_out_buffer = kmalloc(buffer_size, GFP_KERNEL);
754 if (!ucs->bulk_out_buffer) {
755 dev_err(cs->dev, "Couldn't allocate bulk_out_buffer\n");
756 retval = -ENOMEM;
757 goto error;
758 }
759
760 ucs->bulk_out_urb = usb_alloc_urb(0, GFP_KERNEL);
761 if (!ucs->bulk_out_urb) {
762 dev_err(cs->dev, "Couldn't allocate bulk_out_urb\n");
763 retval = -ENOMEM;
764 goto error;
765 }
766
767 endpoint = &hostif->endpoint[1].desc;
768
769 atomic_set(&ucs->busy, 0);
770
771 ucs->read_urb = usb_alloc_urb(0, GFP_KERNEL);
772 if (!ucs->read_urb) {
773 dev_err(cs->dev, "No free urbs available\n");
774 retval = -ENOMEM;
775 goto error;
776 }
777 buffer_size = le16_to_cpu(endpoint->wMaxPacketSize);
778 ucs->rcvbuf_size = buffer_size;
779 ucs->int_in_endpointAddr = endpoint->bEndpointAddress;
780 cs->inbuf[0].rcvbuf = kmalloc(buffer_size, GFP_KERNEL);
781 if (!cs->inbuf[0].rcvbuf) {
782 dev_err(cs->dev, "Couldn't allocate rcvbuf\n");
783 retval = -ENOMEM;
784 goto error;
785 }
786 /* Fill the interrupt urb and send it to the core */
787 usb_fill_int_urb(ucs->read_urb, udev,
788 usb_rcvintpipe(udev,
789 endpoint->bEndpointAddress & 0x0f),
790 cs->inbuf[0].rcvbuf, buffer_size,
791 gigaset_read_int_callback,
792 cs->inbuf + 0, endpoint->bInterval);
793
794 retval = usb_submit_urb(ucs->read_urb, GFP_KERNEL);
795 if (retval) {
796 dev_err(cs->dev, "Could not submit URB (error %d)\n", -retval);
797 goto error;
798 }
799
800 /* tell common part that the device is ready */
801 if (startmode == SM_LOCKED)
802 atomic_set(&cs->mstate, MS_LOCKED);
803
804 if (!gigaset_start(cs)) {
805 tasklet_kill(&cs->write_tasklet);
806 retval = -ENODEV; //FIXME
807 goto error;
808 }
809 return 0;
810
811 error:
812 usb_kill_urb(ucs->read_urb);
813 kfree(ucs->bulk_out_buffer);
814 usb_free_urb(ucs->bulk_out_urb);
815 kfree(cs->inbuf[0].rcvbuf);
816 usb_free_urb(ucs->read_urb);
817 usb_set_intfdata(interface, NULL);
818 ucs->read_urb = ucs->bulk_out_urb = NULL;
819 cs->inbuf[0].rcvbuf = ucs->bulk_out_buffer = NULL;
820 usb_put_dev(ucs->udev);
821 ucs->udev = NULL;
822 ucs->interface = NULL;
823 gigaset_unassign(cs);
824 return retval;
825 }
826
827 static void gigaset_disconnect(struct usb_interface *interface)
828 {
829 struct cardstate *cs;
830 struct usb_cardstate *ucs;
831
832 cs = usb_get_intfdata(interface);
833 ucs = cs->hw.usb;
834 usb_kill_urb(ucs->read_urb);
835
836 gigaset_stop(cs);
837
838 usb_set_intfdata(interface, NULL);
839 tasklet_kill(&cs->write_tasklet);
840
841 usb_kill_urb(ucs->bulk_out_urb); /* FIXME: only if active? */
842
843 kfree(ucs->bulk_out_buffer);
844 usb_free_urb(ucs->bulk_out_urb);
845 kfree(cs->inbuf[0].rcvbuf);
846 usb_free_urb(ucs->read_urb);
847 ucs->read_urb = ucs->bulk_out_urb = NULL;
848 cs->inbuf[0].rcvbuf = ucs->bulk_out_buffer = NULL;
849
850 usb_put_dev(ucs->udev);
851 ucs->interface = NULL;
852 ucs->udev = NULL;
853 cs->dev = NULL;
854 gigaset_unassign(cs);
855 }
856
857 static const struct gigaset_ops ops = {
858 gigaset_write_cmd,
859 gigaset_write_room,
860 gigaset_chars_in_buffer,
861 gigaset_brkchars,
862 gigaset_init_bchannel,
863 gigaset_close_bchannel,
864 gigaset_initbcshw,
865 gigaset_freebcshw,
866 gigaset_reinitbcshw,
867 gigaset_initcshw,
868 gigaset_freecshw,
869 gigaset_set_modem_ctrl,
870 gigaset_baud_rate,
871 gigaset_set_line_ctrl,
872 gigaset_m10x_send_skb,
873 gigaset_m10x_input,
874 };
875
876 /**
877 * usb_gigaset_init
878 * This function is called while kernel-module is loaded
879 */
880 static int __init usb_gigaset_init(void)
881 {
882 int result;
883
884 /* allocate memory for our driver state and intialize it */
885 if ((driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
886 GIGASET_MODULENAME, GIGASET_DEVNAME,
887 &ops, THIS_MODULE)) == NULL)
888 goto error;
889
890 /* allocate memory for our device state and intialize it */
891 cardstate = gigaset_initcs(driver, 1, 1, 0, cidmode, GIGASET_MODULENAME);
892 if (!cardstate)
893 goto error;
894
895 /* register this driver with the USB subsystem */
896 result = usb_register(&gigaset_usb_driver);
897 if (result < 0) {
898 err("usb_gigaset: usb_register failed (error %d)",
899 -result);
900 goto error;
901 }
902
903 info(DRIVER_AUTHOR);
904 info(DRIVER_DESC);
905 return 0;
906
907 error: if (cardstate)
908 gigaset_freecs(cardstate);
909 cardstate = NULL;
910 if (driver)
911 gigaset_freedriver(driver);
912 driver = NULL;
913 return -1;
914 }
915
916
917 /**
918 * usb_gigaset_exit
919 * This function is called while unloading the kernel-module
920 */
921 static void __exit usb_gigaset_exit(void)
922 {
923 gigaset_blockdriver(driver); /* => probe will fail
924 * => no gigaset_start any more
925 */
926
927 gigaset_shutdown(cardstate);
928 /* from now on, no isdn callback should be possible */
929
930 /* deregister this driver with the USB subsystem */
931 usb_deregister(&gigaset_usb_driver);
932 /* this will call the disconnect-callback */
933 /* from now on, no disconnect/probe callback should be running */
934
935 gigaset_freecs(cardstate);
936 cardstate = NULL;
937 gigaset_freedriver(driver);
938 driver = NULL;
939 }
940
941
942 module_init(usb_gigaset_init);
943 module_exit(usb_gigaset_exit);
944
945 MODULE_AUTHOR(DRIVER_AUTHOR);
946 MODULE_DESCRIPTION(DRIVER_DESC);
947
948 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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