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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes...
[mirror_ubuntu-artful-kernel.git] / drivers / usb / atm / usbatm.c
1 /******************************************************************************
2 * usbatm.c - Generic USB xDSL driver core
3 *
4 * Copyright (C) 2001, Alcatel
5 * Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas
6 * Copyright (C) 2004, David Woodhouse, Roman Kagan
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; either version 2 of the License, or (at your option)
11 * any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * more details.
17 *
18 * You should have received a copy of the GNU General Public License along with
19 * this program; if not, write to the Free Software Foundation, Inc., 59
20 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 *
22 ******************************************************************************/
23
24 /*
25 * Written by Johan Verrept, Duncan Sands (duncan.sands@free.fr) and David Woodhouse
26 *
27 * 1.7+: - See the check-in logs
28 *
29 * 1.6: - No longer opens a connection if the firmware is not loaded
30 * - Added support for the speedtouch 330
31 * - Removed the limit on the number of devices
32 * - Module now autoloads on device plugin
33 * - Merged relevant parts of sarlib
34 * - Replaced the kernel thread with a tasklet
35 * - New packet transmission code
36 * - Changed proc file contents
37 * - Fixed all known SMP races
38 * - Many fixes and cleanups
39 * - Various fixes by Oliver Neukum (oliver@neukum.name)
40 *
41 * 1.5A: - Version for inclusion in 2.5 series kernel
42 * - Modifications by Richard Purdie (rpurdie@rpsys.net)
43 * - made compatible with kernel 2.5.6 onwards by changing
44 * usbatm_usb_send_data_context->urb to a pointer and adding code
45 * to alloc and free it
46 * - remove_wait_queue() added to usbatm_atm_processqueue_thread()
47 *
48 * 1.5: - fixed memory leak when atmsar_decode_aal5 returned NULL.
49 * (reported by stephen.robinson@zen.co.uk)
50 *
51 * 1.4: - changed the spin_lock() under interrupt to spin_lock_irqsave()
52 * - unlink all active send urbs of a vcc that is being closed.
53 *
54 * 1.3.1: - added the version number
55 *
56 * 1.3: - Added multiple send urb support
57 * - fixed memory leak and vcc->tx_inuse starvation bug
58 * when not enough memory left in vcc.
59 *
60 * 1.2: - Fixed race condition in usbatm_usb_send_data()
61 * 1.1: - Turned off packet debugging
62 *
63 */
64
65 #include "usbatm.h"
66
67 #include <asm/uaccess.h>
68 #include <linux/crc32.h>
69 #include <linux/errno.h>
70 #include <linux/init.h>
71 #include <linux/interrupt.h>
72 #include <linux/kernel.h>
73 #include <linux/module.h>
74 #include <linux/moduleparam.h>
75 #include <linux/netdevice.h>
76 #include <linux/proc_fs.h>
77 #include <linux/sched.h>
78 #include <linux/signal.h>
79 #include <linux/slab.h>
80 #include <linux/stat.h>
81 #include <linux/timer.h>
82 #include <linux/wait.h>
83 #include <linux/kthread.h>
84
85 #ifdef VERBOSE_DEBUG
86 static int usbatm_print_packet(const unsigned char *data, int len);
87 #define PACKETDEBUG(arg...) usbatm_print_packet (arg)
88 #define vdbg(arg...) dbg (arg)
89 #else
90 #define PACKETDEBUG(arg...)
91 #define vdbg(arg...)
92 #endif
93
94 #define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
95 #define DRIVER_VERSION "1.10"
96 #define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION
97
98 static const char usbatm_driver_name[] = "usbatm";
99
100 #define UDSL_MAX_RCV_URBS 16
101 #define UDSL_MAX_SND_URBS 16
102 #define UDSL_MAX_BUF_SIZE 65536
103 #define UDSL_DEFAULT_RCV_URBS 4
104 #define UDSL_DEFAULT_SND_URBS 4
105 #define UDSL_DEFAULT_RCV_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
106 #define UDSL_DEFAULT_SND_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
107
108 #define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
109
110 #define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */
111
112 static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
113 static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
114 static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE;
115 static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE;
116
117 module_param(num_rcv_urbs, uint, S_IRUGO);
118 MODULE_PARM_DESC(num_rcv_urbs,
119 "Number of urbs used for reception (range: 0-"
120 __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
121 __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
122
123 module_param(num_snd_urbs, uint, S_IRUGO);
124 MODULE_PARM_DESC(num_snd_urbs,
125 "Number of urbs used for transmission (range: 0-"
126 __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
127 __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
128
129 module_param(rcv_buf_bytes, uint, S_IRUGO);
130 MODULE_PARM_DESC(rcv_buf_bytes,
131 "Size of the buffers used for reception, in bytes (range: 1-"
132 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
133 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
134
135 module_param(snd_buf_bytes, uint, S_IRUGO);
136 MODULE_PARM_DESC(snd_buf_bytes,
137 "Size of the buffers used for transmission, in bytes (range: 1-"
138 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
139 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
140
141
142 /* receive */
143
144 struct usbatm_vcc_data {
145 /* vpi/vci lookup */
146 struct list_head list;
147 short vpi;
148 int vci;
149 struct atm_vcc *vcc;
150
151 /* raw cell reassembly */
152 struct sk_buff *sarb;
153 };
154
155
156 /* send */
157
158 struct usbatm_control {
159 struct atm_skb_data atm;
160 u32 len;
161 u32 crc;
162 };
163
164 #define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb)
165
166
167 /* ATM */
168
169 static void usbatm_atm_dev_close(struct atm_dev *atm_dev);
170 static int usbatm_atm_open(struct atm_vcc *vcc);
171 static void usbatm_atm_close(struct atm_vcc *vcc);
172 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg);
173 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
174 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
175
176 static struct atmdev_ops usbatm_atm_devops = {
177 .dev_close = usbatm_atm_dev_close,
178 .open = usbatm_atm_open,
179 .close = usbatm_atm_close,
180 .ioctl = usbatm_atm_ioctl,
181 .send = usbatm_atm_send,
182 .proc_read = usbatm_atm_proc_read,
183 .owner = THIS_MODULE,
184 };
185
186
187 /***********
188 ** misc **
189 ***********/
190
191 static inline unsigned int usbatm_pdu_length(unsigned int length)
192 {
193 length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER;
194 return length - length % ATM_CELL_PAYLOAD;
195 }
196
197 static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
198 {
199 if (vcc->pop)
200 vcc->pop(vcc, skb);
201 else
202 dev_kfree_skb_any(skb);
203 }
204
205
206 /***********
207 ** urbs **
208 ************/
209
210 static struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
211 {
212 struct urb *urb;
213
214 spin_lock_irq(&channel->lock);
215 if (list_empty(&channel->list)) {
216 spin_unlock_irq(&channel->lock);
217 return NULL;
218 }
219
220 urb = list_entry(channel->list.next, struct urb, urb_list);
221 list_del(&urb->urb_list);
222 spin_unlock_irq(&channel->lock);
223
224 return urb;
225 }
226
227 static int usbatm_submit_urb(struct urb *urb)
228 {
229 struct usbatm_channel *channel = urb->context;
230 int ret;
231
232 vdbg("%s: submitting urb 0x%p, size %u",
233 __func__, urb, urb->transfer_buffer_length);
234
235 ret = usb_submit_urb(urb, GFP_ATOMIC);
236 if (ret) {
237 if (printk_ratelimit())
238 atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
239 __func__, urb, ret);
240
241 /* consider all errors transient and return the buffer back to the queue */
242 urb->status = -EAGAIN;
243 spin_lock_irq(&channel->lock);
244
245 /* must add to the front when sending; doesn't matter when receiving */
246 list_add(&urb->urb_list, &channel->list);
247
248 spin_unlock_irq(&channel->lock);
249
250 /* make sure the channel doesn't stall */
251 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
252 }
253
254 return ret;
255 }
256
257 static void usbatm_complete(struct urb *urb)
258 {
259 struct usbatm_channel *channel = urb->context;
260 unsigned long flags;
261 int status = urb->status;
262
263 vdbg("%s: urb 0x%p, status %d, actual_length %d",
264 __func__, urb, status, urb->actual_length);
265
266 /* usually in_interrupt(), but not always */
267 spin_lock_irqsave(&channel->lock, flags);
268
269 /* must add to the back when receiving; doesn't matter when sending */
270 list_add_tail(&urb->urb_list, &channel->list);
271
272 spin_unlock_irqrestore(&channel->lock, flags);
273
274 if (unlikely(status) &&
275 (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) ||
276 status != -EILSEQ ))
277 {
278 if (status == -ESHUTDOWN)
279 return;
280
281 if (printk_ratelimit())
282 atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n",
283 __func__, urb, status);
284 /* throttle processing in case of an error */
285 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
286 } else
287 tasklet_schedule(&channel->tasklet);
288 }
289
290
291 /*************
292 ** decode **
293 *************/
294
295 static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
296 short vpi, int vci)
297 {
298 struct usbatm_vcc_data *vcc_data;
299
300 list_for_each_entry(vcc_data, &instance->vcc_list, list)
301 if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi))
302 return vcc_data;
303 return NULL;
304 }
305
306 static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source)
307 {
308 struct atm_vcc *vcc;
309 struct sk_buff *sarb;
310 short vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4);
311 int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
312 u8 pti = ((source[3] & 0xe) >> 1);
313
314 vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
315
316 if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) {
317 instance->cached_vpi = vpi;
318 instance->cached_vci = vci;
319
320 instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci);
321
322 if (!instance->cached_vcc)
323 atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
324 }
325
326 if (!instance->cached_vcc)
327 return;
328
329 vcc = instance->cached_vcc->vcc;
330
331 /* OAM F5 end-to-end */
332 if (pti == ATM_PTI_E2EF5) {
333 if (printk_ratelimit())
334 atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
335 __func__, vpi, vci);
336 atomic_inc(&vcc->stats->rx_err);
337 return;
338 }
339
340 sarb = instance->cached_vcc->sarb;
341
342 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
343 atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
344 __func__, sarb->len, vcc);
345 /* discard cells already received */
346 skb_trim(sarb, 0);
347 UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end);
348 }
349
350 memcpy(skb_tail_pointer(sarb), source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
351 __skb_put(sarb, ATM_CELL_PAYLOAD);
352
353 if (pti & 1) {
354 struct sk_buff *skb;
355 unsigned int length;
356 unsigned int pdu_length;
357
358 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
359
360 /* guard against overflow */
361 if (length > ATM_MAX_AAL5_PDU) {
362 atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
363 __func__, length, vcc);
364 atomic_inc(&vcc->stats->rx_err);
365 goto out;
366 }
367
368 pdu_length = usbatm_pdu_length(length);
369
370 if (sarb->len < pdu_length) {
371 atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
372 __func__, pdu_length, sarb->len, vcc);
373 atomic_inc(&vcc->stats->rx_err);
374 goto out;
375 }
376
377 if (crc32_be(~0, skb_tail_pointer(sarb) - pdu_length, pdu_length) != 0xc704dd7b) {
378 atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
379 __func__, vcc);
380 atomic_inc(&vcc->stats->rx_err);
381 goto out;
382 }
383
384 vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
385
386 if (!(skb = dev_alloc_skb(length))) {
387 if (printk_ratelimit())
388 atm_err(instance, "%s: no memory for skb (length: %u)!\n",
389 __func__, length);
390 atomic_inc(&vcc->stats->rx_drop);
391 goto out;
392 }
393
394 vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
395
396 if (!atm_charge(vcc, skb->truesize)) {
397 atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
398 __func__, skb->truesize);
399 dev_kfree_skb_any(skb);
400 goto out; /* atm_charge increments rx_drop */
401 }
402
403 skb_copy_to_linear_data(skb,
404 skb_tail_pointer(sarb) - pdu_length,
405 length);
406 __skb_put(skb, length);
407
408 vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
409 __func__, skb, skb->len, skb->truesize);
410
411 PACKETDEBUG(skb->data, skb->len);
412
413 vcc->push(vcc, skb);
414
415 atomic_inc(&vcc->stats->rx);
416 out:
417 skb_trim(sarb, 0);
418 }
419 }
420
421 static void usbatm_extract_cells(struct usbatm_data *instance,
422 unsigned char *source, unsigned int avail_data)
423 {
424 unsigned int stride = instance->rx_channel.stride;
425 unsigned int buf_usage = instance->buf_usage;
426
427 /* extract cells from incoming data, taking into account that
428 * the length of avail data may not be a multiple of stride */
429
430 if (buf_usage > 0) {
431 /* we have a partially received atm cell */
432 unsigned char *cell_buf = instance->cell_buf;
433 unsigned int space_left = stride - buf_usage;
434
435 UDSL_ASSERT(buf_usage <= stride);
436
437 if (avail_data >= space_left) {
438 /* add new data and process cell */
439 memcpy(cell_buf + buf_usage, source, space_left);
440 source += space_left;
441 avail_data -= space_left;
442 usbatm_extract_one_cell(instance, cell_buf);
443 instance->buf_usage = 0;
444 } else {
445 /* not enough data to fill the cell */
446 memcpy(cell_buf + buf_usage, source, avail_data);
447 instance->buf_usage = buf_usage + avail_data;
448 return;
449 }
450 }
451
452 for (; avail_data >= stride; avail_data -= stride, source += stride)
453 usbatm_extract_one_cell(instance, source);
454
455 if (avail_data > 0) {
456 /* length was not a multiple of stride -
457 * save remaining data for next call */
458 memcpy(instance->cell_buf, source, avail_data);
459 instance->buf_usage = avail_data;
460 }
461 }
462
463
464 /*************
465 ** encode **
466 *************/
467
468 static unsigned int usbatm_write_cells(struct usbatm_data *instance,
469 struct sk_buff *skb,
470 u8 *target, unsigned int avail_space)
471 {
472 struct usbatm_control *ctrl = UDSL_SKB(skb);
473 struct atm_vcc *vcc = ctrl->atm.vcc;
474 unsigned int bytes_written;
475 unsigned int stride = instance->tx_channel.stride;
476
477 vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space);
478 UDSL_ASSERT(!(avail_space % stride));
479
480 for (bytes_written = 0; bytes_written < avail_space && ctrl->len;
481 bytes_written += stride, target += stride) {
482 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
483 unsigned int left = ATM_CELL_PAYLOAD - data_len;
484 u8 *ptr = target;
485
486 ptr[0] = vcc->vpi >> 4;
487 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
488 ptr[2] = vcc->vci >> 4;
489 ptr[3] = vcc->vci << 4;
490 ptr[4] = 0xec;
491 ptr += ATM_CELL_HEADER;
492
493 skb_copy_from_linear_data(skb, ptr, data_len);
494 ptr += data_len;
495 __skb_pull(skb, data_len);
496
497 if(!left)
498 continue;
499
500 memset(ptr, 0, left);
501
502 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
503 u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
504 /* trailer[0] = 0; UU = 0 */
505 /* trailer[1] = 0; CPI = 0 */
506 trailer[2] = ctrl->len >> 8;
507 trailer[3] = ctrl->len;
508
509 ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4);
510
511 trailer[4] = ctrl->crc >> 24;
512 trailer[5] = ctrl->crc >> 16;
513 trailer[6] = ctrl->crc >> 8;
514 trailer[7] = ctrl->crc;
515
516 target[3] |= 0x2; /* adjust PTI */
517
518 ctrl->len = 0; /* tag this skb finished */
519 }
520 else
521 ctrl->crc = crc32_be(ctrl->crc, ptr, left);
522 }
523
524 return bytes_written;
525 }
526
527
528 /**************
529 ** receive **
530 **************/
531
532 static void usbatm_rx_process(unsigned long data)
533 {
534 struct usbatm_data *instance = (struct usbatm_data *)data;
535 struct urb *urb;
536
537 while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
538 vdbg("%s: processing urb 0x%p", __func__, urb);
539
540 if (usb_pipeisoc(urb->pipe)) {
541 unsigned char *merge_start = NULL;
542 unsigned int merge_length = 0;
543 const unsigned int packet_size = instance->rx_channel.packet_size;
544 int i;
545
546 for (i = 0; i < urb->number_of_packets; i++) {
547 if (!urb->iso_frame_desc[i].status) {
548 unsigned int actual_length = urb->iso_frame_desc[i].actual_length;
549
550 UDSL_ASSERT(actual_length <= packet_size);
551
552 if (!merge_length)
553 merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
554 merge_length += actual_length;
555 if (merge_length && (actual_length < packet_size)) {
556 usbatm_extract_cells(instance, merge_start, merge_length);
557 merge_length = 0;
558 }
559 } else {
560 atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i);
561 if (merge_length)
562 usbatm_extract_cells(instance, merge_start, merge_length);
563 merge_length = 0;
564 instance->buf_usage = 0;
565 }
566 }
567
568 if (merge_length)
569 usbatm_extract_cells(instance, merge_start, merge_length);
570 } else
571 if (!urb->status)
572 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
573 else
574 instance->buf_usage = 0;
575
576 if (usbatm_submit_urb(urb))
577 return;
578 }
579 }
580
581
582 /***********
583 ** send **
584 ***********/
585
586 static void usbatm_tx_process(unsigned long data)
587 {
588 struct usbatm_data *instance = (struct usbatm_data *)data;
589 struct sk_buff *skb = instance->current_skb;
590 struct urb *urb = NULL;
591 const unsigned int buf_size = instance->tx_channel.buf_size;
592 unsigned int bytes_written = 0;
593 u8 *buffer = NULL;
594
595 if (!skb)
596 skb = skb_dequeue(&instance->sndqueue);
597
598 while (skb) {
599 if (!urb) {
600 urb = usbatm_pop_urb(&instance->tx_channel);
601 if (!urb)
602 break; /* no more senders */
603 buffer = urb->transfer_buffer;
604 bytes_written = (urb->status == -EAGAIN) ?
605 urb->transfer_buffer_length : 0;
606 }
607
608 bytes_written += usbatm_write_cells(instance, skb,
609 buffer + bytes_written,
610 buf_size - bytes_written);
611
612 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p",
613 __func__, bytes_written, skb, urb);
614
615 if (!UDSL_SKB(skb)->len) {
616 struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
617
618 usbatm_pop(vcc, skb);
619 atomic_inc(&vcc->stats->tx);
620
621 skb = skb_dequeue(&instance->sndqueue);
622 }
623
624 if (bytes_written == buf_size || (!skb && bytes_written)) {
625 urb->transfer_buffer_length = bytes_written;
626
627 if (usbatm_submit_urb(urb))
628 break;
629 urb = NULL;
630 }
631 }
632
633 instance->current_skb = skb;
634 }
635
636 static void usbatm_cancel_send(struct usbatm_data *instance,
637 struct atm_vcc *vcc)
638 {
639 struct sk_buff *skb, *n;
640
641 atm_dbg(instance, "%s entered\n", __func__);
642 spin_lock_irq(&instance->sndqueue.lock);
643 for (skb = instance->sndqueue.next, n = skb->next;
644 skb != (struct sk_buff *)&instance->sndqueue;
645 skb = n, n = skb->next)
646 if (UDSL_SKB(skb)->atm.vcc == vcc) {
647 atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
648 __skb_unlink(skb, &instance->sndqueue);
649 usbatm_pop(vcc, skb);
650 }
651 spin_unlock_irq(&instance->sndqueue.lock);
652
653 tasklet_disable(&instance->tx_channel.tasklet);
654 if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
655 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
656 instance->current_skb = NULL;
657 usbatm_pop(vcc, skb);
658 }
659 tasklet_enable(&instance->tx_channel.tasklet);
660 atm_dbg(instance, "%s done\n", __func__);
661 }
662
663 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
664 {
665 struct usbatm_data *instance = vcc->dev->dev_data;
666 struct usbatm_control *ctrl = UDSL_SKB(skb);
667 int err;
668
669 vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);
670
671 /* racy disconnection check - fine */
672 if (!instance || instance->disconnected) {
673 #ifdef DEBUG
674 if (printk_ratelimit())
675 printk(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");
676 #endif
677 err = -ENODEV;
678 goto fail;
679 }
680
681 if (vcc->qos.aal != ATM_AAL5) {
682 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
683 err = -EINVAL;
684 goto fail;
685 }
686
687 if (skb->len > ATM_MAX_AAL5_PDU) {
688 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
689 __func__, skb->len, ATM_MAX_AAL5_PDU);
690 err = -EINVAL;
691 goto fail;
692 }
693
694 PACKETDEBUG(skb->data, skb->len);
695
696 /* initialize the control block */
697 ctrl->atm.vcc = vcc;
698 ctrl->len = skb->len;
699 ctrl->crc = crc32_be(~0, skb->data, skb->len);
700
701 skb_queue_tail(&instance->sndqueue, skb);
702 tasklet_schedule(&instance->tx_channel.tasklet);
703
704 return 0;
705
706 fail:
707 usbatm_pop(vcc, skb);
708 return err;
709 }
710
711
712 /********************
713 ** bean counting **
714 ********************/
715
716 static void usbatm_destroy_instance(struct kref *kref)
717 {
718 struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
719
720 dbg("%s", __func__);
721
722 tasklet_kill(&instance->rx_channel.tasklet);
723 tasklet_kill(&instance->tx_channel.tasklet);
724 usb_put_dev(instance->usb_dev);
725 kfree(instance);
726 }
727
728 static void usbatm_get_instance(struct usbatm_data *instance)
729 {
730 dbg("%s", __func__);
731
732 kref_get(&instance->refcount);
733 }
734
735 static void usbatm_put_instance(struct usbatm_data *instance)
736 {
737 dbg("%s", __func__);
738
739 kref_put(&instance->refcount, usbatm_destroy_instance);
740 }
741
742
743 /**********
744 ** ATM **
745 **********/
746
747 static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
748 {
749 struct usbatm_data *instance = atm_dev->dev_data;
750
751 dbg("%s", __func__);
752
753 if (!instance)
754 return;
755
756 atm_dev->dev_data = NULL; /* catch bugs */
757 usbatm_put_instance(instance); /* taken in usbatm_atm_init */
758 }
759
760 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
761 {
762 struct usbatm_data *instance = atm_dev->dev_data;
763 int left = *pos;
764
765 if (!instance) {
766 dbg("%s: NULL instance!", __func__);
767 return -ENODEV;
768 }
769
770 if (!left--)
771 return sprintf(page, "%s\n", instance->description);
772
773 if (!left--)
774 return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
775 atm_dev->esi[0], atm_dev->esi[1],
776 atm_dev->esi[2], atm_dev->esi[3],
777 atm_dev->esi[4], atm_dev->esi[5]);
778
779 if (!left--)
780 return sprintf(page,
781 "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
782 atomic_read(&atm_dev->stats.aal5.tx),
783 atomic_read(&atm_dev->stats.aal5.tx_err),
784 atomic_read(&atm_dev->stats.aal5.rx),
785 atomic_read(&atm_dev->stats.aal5.rx_err),
786 atomic_read(&atm_dev->stats.aal5.rx_drop));
787
788 if (!left--) {
789 if (instance->disconnected)
790 return sprintf(page, "Disconnected\n");
791 else
792 switch (atm_dev->signal) {
793 case ATM_PHY_SIG_FOUND:
794 return sprintf(page, "Line up\n");
795 case ATM_PHY_SIG_LOST:
796 return sprintf(page, "Line down\n");
797 default:
798 return sprintf(page, "Line state unknown\n");
799 }
800 }
801
802 return 0;
803 }
804
805 static int usbatm_atm_open(struct atm_vcc *vcc)
806 {
807 struct usbatm_data *instance = vcc->dev->dev_data;
808 struct usbatm_vcc_data *new = NULL;
809 int ret;
810 int vci = vcc->vci;
811 short vpi = vcc->vpi;
812
813 if (!instance) {
814 dbg("%s: NULL data!", __func__);
815 return -ENODEV;
816 }
817
818 atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci);
819
820 /* only support AAL5 */
821 if ((vcc->qos.aal != ATM_AAL5)) {
822 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
823 return -EINVAL;
824 }
825
826 /* sanity checks */
827 if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
828 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu);
829 return -EINVAL;
830 }
831
832 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */
833
834 if (instance->disconnected) {
835 atm_dbg(instance, "%s: disconnected!\n", __func__);
836 ret = -ENODEV;
837 goto fail;
838 }
839
840 if (usbatm_find_vcc(instance, vpi, vci)) {
841 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
842 ret = -EADDRINUSE;
843 goto fail;
844 }
845
846 if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) {
847 atm_err(instance, "%s: no memory for vcc_data!\n", __func__);
848 ret = -ENOMEM;
849 goto fail;
850 }
851
852 new->vcc = vcc;
853 new->vpi = vpi;
854 new->vci = vci;
855
856 new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
857 if (!new->sarb) {
858 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__);
859 ret = -ENOMEM;
860 goto fail;
861 }
862
863 vcc->dev_data = new;
864
865 tasklet_disable(&instance->rx_channel.tasklet);
866 instance->cached_vcc = new;
867 instance->cached_vpi = vpi;
868 instance->cached_vci = vci;
869 list_add(&new->list, &instance->vcc_list);
870 tasklet_enable(&instance->rx_channel.tasklet);
871
872 set_bit(ATM_VF_ADDR, &vcc->flags);
873 set_bit(ATM_VF_PARTIAL, &vcc->flags);
874 set_bit(ATM_VF_READY, &vcc->flags);
875
876 mutex_unlock(&instance->serialize);
877
878 atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
879
880 return 0;
881
882 fail:
883 kfree(new);
884 mutex_unlock(&instance->serialize);
885 return ret;
886 }
887
888 static void usbatm_atm_close(struct atm_vcc *vcc)
889 {
890 struct usbatm_data *instance = vcc->dev->dev_data;
891 struct usbatm_vcc_data *vcc_data = vcc->dev_data;
892
893 if (!instance || !vcc_data) {
894 dbg("%s: NULL data!", __func__);
895 return;
896 }
897
898 atm_dbg(instance, "%s entered\n", __func__);
899
900 atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n",
901 __func__, vcc_data, vcc_data->vpi, vcc_data->vci);
902
903 usbatm_cancel_send(instance, vcc);
904
905 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */
906
907 tasklet_disable(&instance->rx_channel.tasklet);
908 if (instance->cached_vcc == vcc_data) {
909 instance->cached_vcc = NULL;
910 instance->cached_vpi = ATM_VPI_UNSPEC;
911 instance->cached_vci = ATM_VCI_UNSPEC;
912 }
913 list_del(&vcc_data->list);
914 tasklet_enable(&instance->rx_channel.tasklet);
915
916 kfree_skb(vcc_data->sarb);
917 vcc_data->sarb = NULL;
918
919 kfree(vcc_data);
920 vcc->dev_data = NULL;
921
922 vcc->vpi = ATM_VPI_UNSPEC;
923 vcc->vci = ATM_VCI_UNSPEC;
924 clear_bit(ATM_VF_READY, &vcc->flags);
925 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
926 clear_bit(ATM_VF_ADDR, &vcc->flags);
927
928 mutex_unlock(&instance->serialize);
929
930 atm_dbg(instance, "%s successful\n", __func__);
931 }
932
933 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd,
934 void __user * arg)
935 {
936 struct usbatm_data *instance = atm_dev->dev_data;
937
938 if (!instance || instance->disconnected) {
939 dbg("%s: %s!", __func__, instance ? "disconnected" : "NULL instance");
940 return -ENODEV;
941 }
942
943 switch (cmd) {
944 case ATM_QUERYLOOP:
945 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
946 default:
947 return -ENOIOCTLCMD;
948 }
949 }
950
951 static int usbatm_atm_init(struct usbatm_data *instance)
952 {
953 struct atm_dev *atm_dev;
954 int ret, i;
955
956 /* ATM init. The ATM initialization scheme suffers from an intrinsic race
957 * condition: callbacks we register can be executed at once, before we have
958 * initialized the struct atm_dev. To protect against this, all callbacks
959 * abort if atm_dev->dev_data is NULL. */
960 atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL);
961 if (!atm_dev) {
962 usb_err(instance, "%s: failed to register ATM device!\n", __func__);
963 return -1;
964 }
965
966 instance->atm_dev = atm_dev;
967
968 atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
969 atm_dev->ci_range.vci_bits = ATM_CI_MAX;
970 atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
971
972 /* temp init ATM device, set to 128kbit */
973 atm_dev->link_rate = 128 * 1000 / 424;
974
975 ret = sysfs_create_link(&atm_dev->class_dev.kobj,
976 &instance->usb_intf->dev.kobj, "device");
977 if (ret) {
978 atm_err(instance, "%s: sysfs_create_link failed: %d\n",
979 __func__, ret);
980 goto fail_sysfs;
981 }
982
983 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
984 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
985 goto fail;
986 }
987
988 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */
989
990 /* ready for ATM callbacks */
991 mb();
992 atm_dev->dev_data = instance;
993
994 /* submit all rx URBs */
995 for (i = 0; i < num_rcv_urbs; i++)
996 usbatm_submit_urb(instance->urbs[i]);
997
998 return 0;
999
1000 fail:
1001 sysfs_remove_link(&atm_dev->class_dev.kobj, "device");
1002 fail_sysfs:
1003 instance->atm_dev = NULL;
1004 atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
1005 return ret;
1006 }
1007
1008
1009 /**********
1010 ** USB **
1011 **********/
1012
1013 static int usbatm_do_heavy_init(void *arg)
1014 {
1015 struct usbatm_data *instance = arg;
1016 int ret;
1017
1018 allow_signal(SIGTERM);
1019 complete(&instance->thread_started);
1020
1021 ret = instance->driver->heavy_init(instance, instance->usb_intf);
1022
1023 if (!ret)
1024 ret = usbatm_atm_init(instance);
1025
1026 mutex_lock(&instance->serialize);
1027 instance->thread = NULL;
1028 mutex_unlock(&instance->serialize);
1029
1030 complete_and_exit(&instance->thread_exited, ret);
1031 }
1032
1033 static int usbatm_heavy_init(struct usbatm_data *instance)
1034 {
1035 struct task_struct *t;
1036
1037 t = kthread_create(usbatm_do_heavy_init, instance,
1038 instance->driver->driver_name);
1039 if (IS_ERR(t)) {
1040 usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n",
1041 __func__, PTR_ERR(t));
1042 return PTR_ERR(t);
1043 }
1044
1045 instance->thread = t;
1046 wake_up_process(t);
1047 wait_for_completion(&instance->thread_started);
1048
1049 return 0;
1050 }
1051
1052 static void usbatm_tasklet_schedule(unsigned long data)
1053 {
1054 tasklet_schedule((struct tasklet_struct *) data);
1055 }
1056
1057 static void usbatm_init_channel(struct usbatm_channel *channel)
1058 {
1059 spin_lock_init(&channel->lock);
1060 INIT_LIST_HEAD(&channel->list);
1061 channel->delay.function = usbatm_tasklet_schedule;
1062 channel->delay.data = (unsigned long) &channel->tasklet;
1063 init_timer(&channel->delay);
1064 }
1065
1066 int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
1067 struct usbatm_driver *driver)
1068 {
1069 struct device *dev = &intf->dev;
1070 struct usb_device *usb_dev = interface_to_usbdev(intf);
1071 struct usbatm_data *instance;
1072 char *buf;
1073 int error = -ENOMEM;
1074 int i, length;
1075 unsigned int maxpacket, num_packets;
1076
1077 dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n",
1078 __func__, driver->driver_name,
1079 le16_to_cpu(usb_dev->descriptor.idVendor),
1080 le16_to_cpu(usb_dev->descriptor.idProduct),
1081 intf->altsetting->desc.bInterfaceNumber);
1082
1083 /* instance init */
1084 instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
1085 if (!instance) {
1086 dev_err(dev, "%s: no memory for instance data!\n", __func__);
1087 return -ENOMEM;
1088 }
1089
1090 /* public fields */
1091
1092 instance->driver = driver;
1093 snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name);
1094
1095 instance->usb_dev = usb_dev;
1096 instance->usb_intf = intf;
1097
1098 buf = instance->description;
1099 length = sizeof(instance->description);
1100
1101 if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
1102 goto bind;
1103
1104 buf += i;
1105 length -= i;
1106
1107 i = scnprintf(buf, length, " (");
1108 buf += i;
1109 length -= i;
1110
1111 if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
1112 goto bind;
1113
1114 buf += i;
1115 length -= i;
1116
1117 snprintf(buf, length, ")");
1118
1119 bind:
1120 if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) {
1121 dev_err(dev, "%s: bind failed: %d!\n", __func__, error);
1122 goto fail_free;
1123 }
1124
1125 /* private fields */
1126
1127 kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */
1128 mutex_init(&instance->serialize);
1129
1130 instance->thread = NULL;
1131 init_completion(&instance->thread_started);
1132 init_completion(&instance->thread_exited);
1133
1134 INIT_LIST_HEAD(&instance->vcc_list);
1135 skb_queue_head_init(&instance->sndqueue);
1136
1137 usbatm_init_channel(&instance->rx_channel);
1138 usbatm_init_channel(&instance->tx_channel);
1139 tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
1140 tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
1141 instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
1142 instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
1143 instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
1144
1145 if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in)
1146 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in);
1147 else
1148 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in);
1149
1150 instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out);
1151
1152 /* tx buffer size must be a positive multiple of the stride */
1153 instance->tx_channel.buf_size = max (instance->tx_channel.stride,
1154 snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride));
1155
1156 /* rx buffer size must be a positive multiple of the endpoint maxpacket */
1157 maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0);
1158
1159 if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) {
1160 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__,
1161 usb_pipeendpoint(instance->rx_channel.endpoint));
1162 error = -EINVAL;
1163 goto fail_unbind;
1164 }
1165
1166 num_packets = max (1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */
1167
1168 if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE)
1169 num_packets--;
1170
1171 instance->rx_channel.buf_size = num_packets * maxpacket;
1172 instance->rx_channel.packet_size = maxpacket;
1173
1174 #ifdef DEBUG
1175 for (i = 0; i < 2; i++) {
1176 struct usbatm_channel *channel = i ?
1177 &instance->tx_channel : &instance->rx_channel;
1178
1179 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel);
1180 }
1181 #endif
1182
1183 /* initialize urbs */
1184
1185 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1186 u8 *buffer;
1187 struct usbatm_channel *channel = i < num_rcv_urbs ?
1188 &instance->rx_channel : &instance->tx_channel;
1189 struct urb *urb;
1190 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0;
1191
1192 UDSL_ASSERT(!usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint));
1193
1194 urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
1195 if (!urb) {
1196 dev_err(dev, "%s: no memory for urb %d!\n", __func__, i);
1197 error = -ENOMEM;
1198 goto fail_unbind;
1199 }
1200
1201 instance->urbs[i] = urb;
1202
1203 /* zero the tx padding to avoid leaking information */
1204 buffer = kzalloc(channel->buf_size, GFP_KERNEL);
1205 if (!buffer) {
1206 dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i);
1207 error = -ENOMEM;
1208 goto fail_unbind;
1209 }
1210
1211 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
1212 buffer, channel->buf_size, usbatm_complete, channel);
1213 if (iso_packets) {
1214 int j;
1215 urb->interval = 1;
1216 urb->transfer_flags = URB_ISO_ASAP;
1217 urb->number_of_packets = iso_packets;
1218 for (j = 0; j < iso_packets; j++) {
1219 urb->iso_frame_desc[j].offset = channel->packet_size * j;
1220 urb->iso_frame_desc[j].length = channel->packet_size;
1221 }
1222 }
1223
1224 /* put all tx URBs on the list of spares */
1225 if (i >= num_rcv_urbs)
1226 list_add_tail(&urb->urb_list, &channel->list);
1227
1228 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p",
1229 __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
1230 }
1231
1232 instance->cached_vpi = ATM_VPI_UNSPEC;
1233 instance->cached_vci = ATM_VCI_UNSPEC;
1234 instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL);
1235
1236 if (!instance->cell_buf) {
1237 dev_err(dev, "%s: no memory for cell buffer!\n", __func__);
1238 error = -ENOMEM;
1239 goto fail_unbind;
1240 }
1241
1242 if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) {
1243 error = usbatm_heavy_init(instance);
1244 } else {
1245 complete(&instance->thread_exited); /* pretend that heavy_init was run */
1246 error = usbatm_atm_init(instance);
1247 }
1248
1249 if (error < 0)
1250 goto fail_unbind;
1251
1252 usb_get_dev(usb_dev);
1253 usb_set_intfdata(intf, instance);
1254
1255 return 0;
1256
1257 fail_unbind:
1258 if (instance->driver->unbind)
1259 instance->driver->unbind(instance, intf);
1260 fail_free:
1261 kfree(instance->cell_buf);
1262
1263 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1264 if (instance->urbs[i])
1265 kfree(instance->urbs[i]->transfer_buffer);
1266 usb_free_urb(instance->urbs[i]);
1267 }
1268
1269 kfree (instance);
1270
1271 return error;
1272 }
1273 EXPORT_SYMBOL_GPL(usbatm_usb_probe);
1274
1275 void usbatm_usb_disconnect(struct usb_interface *intf)
1276 {
1277 struct device *dev = &intf->dev;
1278 struct usbatm_data *instance = usb_get_intfdata(intf);
1279 struct usbatm_vcc_data *vcc_data;
1280 int i;
1281
1282 dev_dbg(dev, "%s entered\n", __func__);
1283
1284 if (!instance) {
1285 dev_dbg(dev, "%s: NULL instance!\n", __func__);
1286 return;
1287 }
1288
1289 usb_set_intfdata(intf, NULL);
1290
1291 mutex_lock(&instance->serialize);
1292 instance->disconnected = 1;
1293 if (instance->thread != NULL)
1294 send_sig(SIGTERM, instance->thread, 1);
1295 mutex_unlock(&instance->serialize);
1296
1297 wait_for_completion(&instance->thread_exited);
1298
1299 mutex_lock(&instance->serialize);
1300 list_for_each_entry(vcc_data, &instance->vcc_list, list)
1301 vcc_release_async(vcc_data->vcc, -EPIPE);
1302 mutex_unlock(&instance->serialize);
1303
1304 tasklet_disable(&instance->rx_channel.tasklet);
1305 tasklet_disable(&instance->tx_channel.tasklet);
1306
1307 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
1308 usb_kill_urb(instance->urbs[i]);
1309
1310 del_timer_sync(&instance->rx_channel.delay);
1311 del_timer_sync(&instance->tx_channel.delay);
1312
1313 /* turn usbatm_[rt]x_process into something close to a no-op */
1314 /* no need to take the spinlock */
1315 INIT_LIST_HEAD(&instance->rx_channel.list);
1316 INIT_LIST_HEAD(&instance->tx_channel.list);
1317
1318 tasklet_enable(&instance->rx_channel.tasklet);
1319 tasklet_enable(&instance->tx_channel.tasklet);
1320
1321 if (instance->atm_dev && instance->driver->atm_stop)
1322 instance->driver->atm_stop(instance, instance->atm_dev);
1323
1324 if (instance->driver->unbind)
1325 instance->driver->unbind(instance, intf);
1326
1327 instance->driver_data = NULL;
1328
1329 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1330 kfree(instance->urbs[i]->transfer_buffer);
1331 usb_free_urb(instance->urbs[i]);
1332 }
1333
1334 kfree(instance->cell_buf);
1335
1336 /* ATM finalize */
1337 if (instance->atm_dev) {
1338 sysfs_remove_link(&instance->atm_dev->class_dev.kobj, "device");
1339 atm_dev_deregister(instance->atm_dev);
1340 }
1341
1342 usbatm_put_instance(instance); /* taken in usbatm_usb_probe */
1343 }
1344 EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
1345
1346
1347 /***********
1348 ** init **
1349 ***********/
1350
1351 static int __init usbatm_usb_init(void)
1352 {
1353 dbg("%s: driver version %s", __func__, DRIVER_VERSION);
1354
1355 if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) {
1356 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
1357 return -EIO;
1358 }
1359
1360 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1361 || (num_snd_urbs > UDSL_MAX_SND_URBS)
1362 || (rcv_buf_bytes < 1)
1363 || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE)
1364 || (snd_buf_bytes < 1)
1365 || (snd_buf_bytes > UDSL_MAX_BUF_SIZE))
1366 return -EINVAL;
1367
1368 return 0;
1369 }
1370 module_init(usbatm_usb_init);
1371
1372 static void __exit usbatm_usb_exit(void)
1373 {
1374 dbg("%s", __func__);
1375 }
1376 module_exit(usbatm_usb_exit);
1377
1378 MODULE_AUTHOR(DRIVER_AUTHOR);
1379 MODULE_DESCRIPTION(DRIVER_DESC);
1380 MODULE_LICENSE("GPL");
1381 MODULE_VERSION(DRIVER_VERSION);
1382
1383 /************
1384 ** debug **
1385 ************/
1386
1387 #ifdef VERBOSE_DEBUG
1388 static int usbatm_print_packet(const unsigned char *data, int len)
1389 {
1390 unsigned char buffer[256];
1391 int i = 0, j = 0;
1392
1393 for (i = 0; i < len;) {
1394 buffer[0] = '\0';
1395 sprintf(buffer, "%.3d :", i);
1396 for (j = 0; (j < 16) && (i < len); j++, i++) {
1397 sprintf(buffer, "%s %2.2x", buffer, data[i]);
1398 }
1399 dbg("%s", buffer);
1400 }
1401 return i;
1402 }
1403 #endif
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