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Merge branch 'for-3.11' of git://linux-nfs.org/~bfields/linux
[linux-2.6.git] / drivers / usb / atm / usbatm.c
blob5e0d33a7da58de75222807f17a915c373575ca8c
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 #include <linux/ratelimit.h>
85
86 #ifdef VERBOSE_DEBUG
87 static int usbatm_print_packet(struct usbatm_data *instance, const unsigned char *data, int len);
88 #define PACKETDEBUG(arg...) usbatm_print_packet(arg)
89 #define vdbg(arg...) dev_dbg(arg)
90 #else
91 #define PACKETDEBUG(arg...)
92 #define vdbg(arg...)
93 #endif
94
95 #define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
96 #define DRIVER_VERSION "1.10"
97 #define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION
98
99 static const char usbatm_driver_name[] = "usbatm";
100
101 #define UDSL_MAX_RCV_URBS 16
102 #define UDSL_MAX_SND_URBS 16
103 #define UDSL_MAX_BUF_SIZE 65536
104 #define UDSL_DEFAULT_RCV_URBS 4
105 #define UDSL_DEFAULT_SND_URBS 4
106 #define UDSL_DEFAULT_RCV_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
107 #define UDSL_DEFAULT_SND_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
108
109 #define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
110
111 #define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */
112
113 static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
114 static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
115 static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE;
116 static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE;
117
118 module_param(num_rcv_urbs, uint, S_IRUGO);
119 MODULE_PARM_DESC(num_rcv_urbs,
120 "Number of urbs used for reception (range: 0-"
121 __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
122 __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
123
124 module_param(num_snd_urbs, uint, S_IRUGO);
125 MODULE_PARM_DESC(num_snd_urbs,
126 "Number of urbs used for transmission (range: 0-"
127 __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
128 __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
129
130 module_param(rcv_buf_bytes, uint, S_IRUGO);
131 MODULE_PARM_DESC(rcv_buf_bytes,
132 "Size of the buffers used for reception, in bytes (range: 1-"
133 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
134 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
135
136 module_param(snd_buf_bytes, uint, S_IRUGO);
137 MODULE_PARM_DESC(snd_buf_bytes,
138 "Size of the buffers used for transmission, in bytes (range: 1-"
139 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
140 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
141
142
143 /* receive */
144
145 struct usbatm_vcc_data {
146 /* vpi/vci lookup */
147 struct list_head list;
148 short vpi;
149 int vci;
150 struct atm_vcc *vcc;
151
152 /* raw cell reassembly */
153 struct sk_buff *sarb;
154 };
155
156
157 /* send */
158
159 struct usbatm_control {
160 struct atm_skb_data atm;
161 u32 len;
162 u32 crc;
163 };
164
165 #define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb)
166
167
168 /* ATM */
169
170 static void usbatm_atm_dev_close(struct atm_dev *atm_dev);
171 static int usbatm_atm_open(struct atm_vcc *vcc);
172 static void usbatm_atm_close(struct atm_vcc *vcc);
173 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg);
174 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
175 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
176
177 static struct atmdev_ops usbatm_atm_devops = {
178 .dev_close = usbatm_atm_dev_close,
179 .open = usbatm_atm_open,
180 .close = usbatm_atm_close,
181 .ioctl = usbatm_atm_ioctl,
182 .send = usbatm_atm_send,
183 .proc_read = usbatm_atm_proc_read,
184 .owner = THIS_MODULE,
185 };
186
187
188 /***********
189 ** misc **
190 ***********/
191
192 static inline unsigned int usbatm_pdu_length(unsigned int length)
193 {
194 length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER;
195 return length - length % ATM_CELL_PAYLOAD;
196 }
197
198 static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
199 {
200 if (vcc->pop)
201 vcc->pop(vcc, skb);
202 else
203 dev_kfree_skb_any(skb);
204 }
205
206
207 /***********
208 ** urbs **
209 ************/
210
211 static struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
212 {
213 struct urb *urb;
214
215 spin_lock_irq(&channel->lock);
216 if (list_empty(&channel->list)) {
217 spin_unlock_irq(&channel->lock);
218 return NULL;
219 }
220
221 urb = list_entry(channel->list.next, struct urb, urb_list);
222 list_del(&urb->urb_list);
223 spin_unlock_irq(&channel->lock);
224
225 return urb;
226 }
227
228 static int usbatm_submit_urb(struct urb *urb)
229 {
230 struct usbatm_channel *channel = urb->context;
231 int ret;
232
233 /* vdbg("%s: submitting urb 0x%p, size %u",
234 __func__, urb, urb->transfer_buffer_length); */
235
236 ret = usb_submit_urb(urb, GFP_ATOMIC);
237 if (ret) {
238 if (printk_ratelimit())
239 atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
240 __func__, urb, ret);
241
242 /* consider all errors transient and return the buffer back to the queue */
243 urb->status = -EAGAIN;
244 spin_lock_irq(&channel->lock);
245
246 /* must add to the front when sending; doesn't matter when receiving */
247 list_add(&urb->urb_list, &channel->list);
248
249 spin_unlock_irq(&channel->lock);
250
251 /* make sure the channel doesn't stall */
252 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
253 }
254
255 return ret;
256 }
257
258 static void usbatm_complete(struct urb *urb)
259 {
260 struct usbatm_channel *channel = urb->context;
261 unsigned long flags;
262 int status = urb->status;
263
264 /* vdbg("%s: urb 0x%p, status %d, actual_length %d",
265 __func__, urb, status, urb->actual_length); */
266
267 /* usually in_interrupt(), but not always */
268 spin_lock_irqsave(&channel->lock, flags);
269
270 /* must add to the back when receiving; doesn't matter when sending */
271 list_add_tail(&urb->urb_list, &channel->list);
272
273 spin_unlock_irqrestore(&channel->lock, flags);
274
275 if (unlikely(status) &&
276 (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) ||
277 status != -EILSEQ)) {
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(&instance->usb_intf->dev, "%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(instance, 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(&instance->usb_intf->dev,
385 "%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)",
386 __func__, length, pdu_length, vcc);
387
388 if (!(skb = dev_alloc_skb(length))) {
389 if (printk_ratelimit())
390 atm_err(instance, "%s: no memory for skb (length: %u)!\n",
391 __func__, length);
392 atomic_inc(&vcc->stats->rx_drop);
393 goto out;
394 }
395
396 vdbg(&instance->usb_intf->dev,
397 "%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)",
398 __func__, skb, skb->truesize);
399
400 if (!atm_charge(vcc, skb->truesize)) {
401 atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
402 __func__, skb->truesize);
403 dev_kfree_skb_any(skb);
404 goto out; /* atm_charge increments rx_drop */
405 }
406
407 skb_copy_to_linear_data(skb,
408 skb_tail_pointer(sarb) - pdu_length,
409 length);
410 __skb_put(skb, length);
411
412 vdbg(&instance->usb_intf->dev,
413 "%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
414 __func__, skb, skb->len, skb->truesize);
415
416 PACKETDEBUG(instance, skb->data, skb->len);
417
418 vcc->push(vcc, skb);
419
420 atomic_inc(&vcc->stats->rx);
421 out:
422 skb_trim(sarb, 0);
423 }
424 }
425
426 static void usbatm_extract_cells(struct usbatm_data *instance,
427 unsigned char *source, unsigned int avail_data)
428 {
429 unsigned int stride = instance->rx_channel.stride;
430 unsigned int buf_usage = instance->buf_usage;
431
432 /* extract cells from incoming data, taking into account that
433 * the length of avail data may not be a multiple of stride */
434
435 if (buf_usage > 0) {
436 /* we have a partially received atm cell */
437 unsigned char *cell_buf = instance->cell_buf;
438 unsigned int space_left = stride - buf_usage;
439
440 UDSL_ASSERT(instance, buf_usage <= stride);
441
442 if (avail_data >= space_left) {
443 /* add new data and process cell */
444 memcpy(cell_buf + buf_usage, source, space_left);
445 source += space_left;
446 avail_data -= space_left;
447 usbatm_extract_one_cell(instance, cell_buf);
448 instance->buf_usage = 0;
449 } else {
450 /* not enough data to fill the cell */
451 memcpy(cell_buf + buf_usage, source, avail_data);
452 instance->buf_usage = buf_usage + avail_data;
453 return;
454 }
455 }
456
457 for (; avail_data >= stride; avail_data -= stride, source += stride)
458 usbatm_extract_one_cell(instance, source);
459
460 if (avail_data > 0) {
461 /* length was not a multiple of stride -
462 * save remaining data for next call */
463 memcpy(instance->cell_buf, source, avail_data);
464 instance->buf_usage = avail_data;
465 }
466 }
467
468
469 /*************
470 ** encode **
471 *************/
472
473 static unsigned int usbatm_write_cells(struct usbatm_data *instance,
474 struct sk_buff *skb,
475 u8 *target, unsigned int avail_space)
476 {
477 struct usbatm_control *ctrl = UDSL_SKB(skb);
478 struct atm_vcc *vcc = ctrl->atm.vcc;
479 unsigned int bytes_written;
480 unsigned int stride = instance->tx_channel.stride;
481
482 vdbg(&instance->usb_intf->dev, "%s: skb->len=%d, avail_space=%u",
483 __func__, skb->len, avail_space);
484 UDSL_ASSERT(instance, !(avail_space % stride));
485
486 for (bytes_written = 0; bytes_written < avail_space && ctrl->len;
487 bytes_written += stride, target += stride) {
488 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
489 unsigned int left = ATM_CELL_PAYLOAD - data_len;
490 u8 *ptr = target;
491
492 ptr[0] = vcc->vpi >> 4;
493 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
494 ptr[2] = vcc->vci >> 4;
495 ptr[3] = vcc->vci << 4;
496 ptr[4] = 0xec;
497 ptr += ATM_CELL_HEADER;
498
499 skb_copy_from_linear_data(skb, ptr, data_len);
500 ptr += data_len;
501 __skb_pull(skb, data_len);
502
503 if (!left)
504 continue;
505
506 memset(ptr, 0, left);
507
508 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
509 u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
510 /* trailer[0] = 0; UU = 0 */
511 /* trailer[1] = 0; CPI = 0 */
512 trailer[2] = ctrl->len >> 8;
513 trailer[3] = ctrl->len;
514
515 ctrl->crc = ~crc32_be(ctrl->crc, ptr, left - 4);
516
517 trailer[4] = ctrl->crc >> 24;
518 trailer[5] = ctrl->crc >> 16;
519 trailer[6] = ctrl->crc >> 8;
520 trailer[7] = ctrl->crc;
521
522 target[3] |= 0x2; /* adjust PTI */
523
524 ctrl->len = 0; /* tag this skb finished */
525 } else
526 ctrl->crc = crc32_be(ctrl->crc, ptr, left);
527 }
528
529 return bytes_written;
530 }
531
532
533 /**************
534 ** receive **
535 **************/
536
537 static void usbatm_rx_process(unsigned long data)
538 {
539 struct usbatm_data *instance = (struct usbatm_data *)data;
540 struct urb *urb;
541
542 while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
543 vdbg(&instance->usb_intf->dev,
544 "%s: processing urb 0x%p", __func__, urb);
545
546 if (usb_pipeisoc(urb->pipe)) {
547 unsigned char *merge_start = NULL;
548 unsigned int merge_length = 0;
549 const unsigned int packet_size = instance->rx_channel.packet_size;
550 int i;
551
552 for (i = 0; i < urb->number_of_packets; i++) {
553 if (!urb->iso_frame_desc[i].status) {
554 unsigned int actual_length = urb->iso_frame_desc[i].actual_length;
555
556 UDSL_ASSERT(instance, actual_length <= packet_size);
557
558 if (!merge_length)
559 merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
560 merge_length += actual_length;
561 if (merge_length && (actual_length < packet_size)) {
562 usbatm_extract_cells(instance, merge_start, merge_length);
563 merge_length = 0;
564 }
565 } else {
566 atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i);
567 if (merge_length)
568 usbatm_extract_cells(instance, merge_start, merge_length);
569 merge_length = 0;
570 instance->buf_usage = 0;
571 }
572 }
573
574 if (merge_length)
575 usbatm_extract_cells(instance, merge_start, merge_length);
576 } else
577 if (!urb->status)
578 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
579 else
580 instance->buf_usage = 0;
581
582 if (usbatm_submit_urb(urb))
583 return;
584 }
585 }
586
587
588 /***********
589 ** send **
590 ***********/
591
592 static void usbatm_tx_process(unsigned long data)
593 {
594 struct usbatm_data *instance = (struct usbatm_data *)data;
595 struct sk_buff *skb = instance->current_skb;
596 struct urb *urb = NULL;
597 const unsigned int buf_size = instance->tx_channel.buf_size;
598 unsigned int bytes_written = 0;
599 u8 *buffer = NULL;
600
601 if (!skb)
602 skb = skb_dequeue(&instance->sndqueue);
603
604 while (skb) {
605 if (!urb) {
606 urb = usbatm_pop_urb(&instance->tx_channel);
607 if (!urb)
608 break; /* no more senders */
609 buffer = urb->transfer_buffer;
610 bytes_written = (urb->status == -EAGAIN) ?
611 urb->transfer_buffer_length : 0;
612 }
613
614 bytes_written += usbatm_write_cells(instance, skb,
615 buffer + bytes_written,
616 buf_size - bytes_written);
617
618 vdbg(&instance->usb_intf->dev,
619 "%s: wrote %u bytes from skb 0x%p to urb 0x%p",
620 __func__, bytes_written, skb, urb);
621
622 if (!UDSL_SKB(skb)->len) {
623 struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
624
625 usbatm_pop(vcc, skb);
626 atomic_inc(&vcc->stats->tx);
627
628 skb = skb_dequeue(&instance->sndqueue);
629 }
630
631 if (bytes_written == buf_size || (!skb && bytes_written)) {
632 urb->transfer_buffer_length = bytes_written;
633
634 if (usbatm_submit_urb(urb))
635 break;
636 urb = NULL;
637 }
638 }
639
640 instance->current_skb = skb;
641 }
642
643 static void usbatm_cancel_send(struct usbatm_data *instance,
644 struct atm_vcc *vcc)
645 {
646 struct sk_buff *skb, *n;
647
648 atm_dbg(instance, "%s entered\n", __func__);
649 spin_lock_irq(&instance->sndqueue.lock);
650 skb_queue_walk_safe(&instance->sndqueue, skb, n) {
651 if (UDSL_SKB(skb)->atm.vcc == vcc) {
652 atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
653 __skb_unlink(skb, &instance->sndqueue);
654 usbatm_pop(vcc, skb);
655 }
656 }
657 spin_unlock_irq(&instance->sndqueue.lock);
658
659 tasklet_disable(&instance->tx_channel.tasklet);
660 if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
661 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
662 instance->current_skb = NULL;
663 usbatm_pop(vcc, skb);
664 }
665 tasklet_enable(&instance->tx_channel.tasklet);
666 atm_dbg(instance, "%s done\n", __func__);
667 }
668
669 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
670 {
671 struct usbatm_data *instance = vcc->dev->dev_data;
672 struct usbatm_control *ctrl = UDSL_SKB(skb);
673 int err;
674
675 /* racy disconnection check - fine */
676 if (!instance || instance->disconnected) {
677 #ifdef DEBUG
678 printk_ratelimited(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");
679 #endif
680 err = -ENODEV;
681 goto fail;
682 }
683
684 vdbg(&instance->usb_intf->dev, "%s called (skb 0x%p, len %u)", __func__,
685 skb, skb->len);
686
687 if (vcc->qos.aal != ATM_AAL5) {
688 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
689 err = -EINVAL;
690 goto fail;
691 }
692
693 if (skb->len > ATM_MAX_AAL5_PDU) {
694 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
695 __func__, skb->len, ATM_MAX_AAL5_PDU);
696 err = -EINVAL;
697 goto fail;
698 }
699
700 PACKETDEBUG(instance, skb->data, skb->len);
701
702 /* initialize the control block */
703 ctrl->atm.vcc = vcc;
704 ctrl->len = skb->len;
705 ctrl->crc = crc32_be(~0, skb->data, skb->len);
706
707 skb_queue_tail(&instance->sndqueue, skb);
708 tasklet_schedule(&instance->tx_channel.tasklet);
709
710 return 0;
711
712 fail:
713 usbatm_pop(vcc, skb);
714 return err;
715 }
716
717
718 /********************
719 ** bean counting **
720 ********************/
721
722 static void usbatm_destroy_instance(struct kref *kref)
723 {
724 struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
725
726 usb_dbg(instance, "%s\n", __func__);
727
728 tasklet_kill(&instance->rx_channel.tasklet);
729 tasklet_kill(&instance->tx_channel.tasklet);
730 usb_put_dev(instance->usb_dev);
731 kfree(instance);
732 }
733
734 static void usbatm_get_instance(struct usbatm_data *instance)
735 {
736 usb_dbg(instance, "%s\n", __func__);
737
738 kref_get(&instance->refcount);
739 }
740
741 static void usbatm_put_instance(struct usbatm_data *instance)
742 {
743 usb_dbg(instance, "%s\n", __func__);
744
745 kref_put(&instance->refcount, usbatm_destroy_instance);
746 }
747
748
749 /**********
750 ** ATM **
751 **********/
752
753 static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
754 {
755 struct usbatm_data *instance = atm_dev->dev_data;
756
757 if (!instance)
758 return;
759
760 usb_dbg(instance, "%s\n", __func__);
761 atm_dev->dev_data = NULL; /* catch bugs */
762 usbatm_put_instance(instance); /* taken in usbatm_atm_init */
763 }
764
765 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
766 {
767 struct usbatm_data *instance = atm_dev->dev_data;
768 int left = *pos;
769
770 if (!instance)
771 return -ENODEV;
772
773 if (!left--)
774 return sprintf(page, "%s\n", instance->description);
775
776 if (!left--)
777 return sprintf(page, "MAC: %pM\n", atm_dev->esi);
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 return -ENODEV;
815
816 atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci);
817
818 /* only support AAL5 */
819 if ((vcc->qos.aal != ATM_AAL5)) {
820 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
821 return -EINVAL;
822 }
823
824 /* sanity checks */
825 if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
826 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu);
827 return -EINVAL;
828 }
829
830 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */
831
832 if (instance->disconnected) {
833 atm_dbg(instance, "%s: disconnected!\n", __func__);
834 ret = -ENODEV;
835 goto fail;
836 }
837
838 if (usbatm_find_vcc(instance, vpi, vci)) {
839 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
840 ret = -EADDRINUSE;
841 goto fail;
842 }
843
844 if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) {
845 atm_err(instance, "%s: no memory for vcc_data!\n", __func__);
846 ret = -ENOMEM;
847 goto fail;
848 }
849
850 new->vcc = vcc;
851 new->vpi = vpi;
852 new->vci = vci;
853
854 new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
855 if (!new->sarb) {
856 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__);
857 ret = -ENOMEM;
858 goto fail;
859 }
860
861 vcc->dev_data = new;
862
863 tasklet_disable(&instance->rx_channel.tasklet);
864 instance->cached_vcc = new;
865 instance->cached_vpi = vpi;
866 instance->cached_vci = vci;
867 list_add(&new->list, &instance->vcc_list);
868 tasklet_enable(&instance->rx_channel.tasklet);
869
870 set_bit(ATM_VF_ADDR, &vcc->flags);
871 set_bit(ATM_VF_PARTIAL, &vcc->flags);
872 set_bit(ATM_VF_READY, &vcc->flags);
873
874 mutex_unlock(&instance->serialize);
875
876 atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
877
878 return 0;
879
880 fail:
881 kfree(new);
882 mutex_unlock(&instance->serialize);
883 return ret;
884 }
885
886 static void usbatm_atm_close(struct atm_vcc *vcc)
887 {
888 struct usbatm_data *instance = vcc->dev->dev_data;
889 struct usbatm_vcc_data *vcc_data = vcc->dev_data;
890
891 if (!instance || !vcc_data)
892 return;
893
894 atm_dbg(instance, "%s entered\n", __func__);
895
896 atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n",
897 __func__, vcc_data, vcc_data->vpi, vcc_data->vci);
898
899 usbatm_cancel_send(instance, vcc);
900
901 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */
902
903 tasklet_disable(&instance->rx_channel.tasklet);
904 if (instance->cached_vcc == vcc_data) {
905 instance->cached_vcc = NULL;
906 instance->cached_vpi = ATM_VPI_UNSPEC;
907 instance->cached_vci = ATM_VCI_UNSPEC;
908 }
909 list_del(&vcc_data->list);
910 tasklet_enable(&instance->rx_channel.tasklet);
911
912 kfree_skb(vcc_data->sarb);
913 vcc_data->sarb = NULL;
914
915 kfree(vcc_data);
916 vcc->dev_data = NULL;
917
918 vcc->vpi = ATM_VPI_UNSPEC;
919 vcc->vci = ATM_VCI_UNSPEC;
920 clear_bit(ATM_VF_READY, &vcc->flags);
921 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
922 clear_bit(ATM_VF_ADDR, &vcc->flags);
923
924 mutex_unlock(&instance->serialize);
925
926 atm_dbg(instance, "%s successful\n", __func__);
927 }
928
929 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd,
930 void __user * arg)
931 {
932 struct usbatm_data *instance = atm_dev->dev_data;
933
934 if (!instance || instance->disconnected)
935 return -ENODEV;
936
937 switch (cmd) {
938 case ATM_QUERYLOOP:
939 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
940 default:
941 return -ENOIOCTLCMD;
942 }
943 }
944
945 static int usbatm_atm_init(struct usbatm_data *instance)
946 {
947 struct atm_dev *atm_dev;
948 int ret, i;
949
950 /* ATM init. The ATM initialization scheme suffers from an intrinsic race
951 * condition: callbacks we register can be executed at once, before we have
952 * initialized the struct atm_dev. To protect against this, all callbacks
953 * abort if atm_dev->dev_data is NULL. */
954 atm_dev = atm_dev_register(instance->driver_name,
955 &instance->usb_intf->dev, &usbatm_atm_devops,
956 -1, NULL);
957 if (!atm_dev) {
958 usb_err(instance, "%s: failed to register ATM device!\n", __func__);
959 return -1;
960 }
961
962 instance->atm_dev = atm_dev;
963
964 atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
965 atm_dev->ci_range.vci_bits = ATM_CI_MAX;
966 atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
967
968 /* temp init ATM device, set to 128kbit */
969 atm_dev->link_rate = 128 * 1000 / 424;
970
971 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
972 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
973 goto fail;
974 }
975
976 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */
977
978 /* ready for ATM callbacks */
979 mb();
980 atm_dev->dev_data = instance;
981
982 /* submit all rx URBs */
983 for (i = 0; i < num_rcv_urbs; i++)
984 usbatm_submit_urb(instance->urbs[i]);
985
986 return 0;
987
988 fail:
989 instance->atm_dev = NULL;
990 atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
991 return ret;
992 }
993
994
995 /**********
996 ** USB **
997 **********/
998
999 static int usbatm_do_heavy_init(void *arg)
1000 {
1001 struct usbatm_data *instance = arg;
1002 int ret;
1003
1004 allow_signal(SIGTERM);
1005 complete(&instance->thread_started);
1006
1007 ret = instance->driver->heavy_init(instance, instance->usb_intf);
1008
1009 if (!ret)
1010 ret = usbatm_atm_init(instance);
1011
1012 mutex_lock(&instance->serialize);
1013 instance->thread = NULL;
1014 mutex_unlock(&instance->serialize);
1015
1016 complete_and_exit(&instance->thread_exited, ret);
1017 }
1018
1019 static int usbatm_heavy_init(struct usbatm_data *instance)
1020 {
1021 struct task_struct *t;
1022
1023 t = kthread_create(usbatm_do_heavy_init, instance, "%s",
1024 instance->driver->driver_name);
1025 if (IS_ERR(t)) {
1026 usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n",
1027 __func__, PTR_ERR(t));
1028 return PTR_ERR(t);
1029 }
1030
1031 instance->thread = t;
1032 wake_up_process(t);
1033 wait_for_completion(&instance->thread_started);
1034
1035 return 0;
1036 }
1037
1038 static void usbatm_tasklet_schedule(unsigned long data)
1039 {
1040 tasklet_schedule((struct tasklet_struct *) data);
1041 }
1042
1043 static void usbatm_init_channel(struct usbatm_channel *channel)
1044 {
1045 spin_lock_init(&channel->lock);
1046 INIT_LIST_HEAD(&channel->list);
1047 channel->delay.function = usbatm_tasklet_schedule;
1048 channel->delay.data = (unsigned long) &channel->tasklet;
1049 init_timer(&channel->delay);
1050 }
1051
1052 int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
1053 struct usbatm_driver *driver)
1054 {
1055 struct device *dev = &intf->dev;
1056 struct usb_device *usb_dev = interface_to_usbdev(intf);
1057 struct usbatm_data *instance;
1058 char *buf;
1059 int error = -ENOMEM;
1060 int i, length;
1061 unsigned int maxpacket, num_packets;
1062
1063 dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n",
1064 __func__, driver->driver_name,
1065 le16_to_cpu(usb_dev->descriptor.idVendor),
1066 le16_to_cpu(usb_dev->descriptor.idProduct),
1067 intf->altsetting->desc.bInterfaceNumber);
1068
1069 /* instance init */
1070 instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
1071 if (!instance) {
1072 dev_err(dev, "%s: no memory for instance data!\n", __func__);
1073 return -ENOMEM;
1074 }
1075
1076 /* public fields */
1077
1078 instance->driver = driver;
1079 strlcpy(instance->driver_name, driver->driver_name,
1080 sizeof(instance->driver_name));
1081
1082 instance->usb_dev = usb_dev;
1083 instance->usb_intf = intf;
1084
1085 buf = instance->description;
1086 length = sizeof(instance->description);
1087
1088 if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
1089 goto bind;
1090
1091 buf += i;
1092 length -= i;
1093
1094 i = scnprintf(buf, length, " (");
1095 buf += i;
1096 length -= i;
1097
1098 if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
1099 goto bind;
1100
1101 buf += i;
1102 length -= i;
1103
1104 snprintf(buf, length, ")");
1105
1106 bind:
1107 if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) {
1108 dev_err(dev, "%s: bind failed: %d!\n", __func__, error);
1109 goto fail_free;
1110 }
1111
1112 /* private fields */
1113
1114 kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */
1115 mutex_init(&instance->serialize);
1116
1117 instance->thread = NULL;
1118 init_completion(&instance->thread_started);
1119 init_completion(&instance->thread_exited);
1120
1121 INIT_LIST_HEAD(&instance->vcc_list);
1122 skb_queue_head_init(&instance->sndqueue);
1123
1124 usbatm_init_channel(&instance->rx_channel);
1125 usbatm_init_channel(&instance->tx_channel);
1126 tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
1127 tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
1128 instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
1129 instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
1130 instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
1131
1132 if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in)
1133 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in);
1134 else
1135 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in);
1136
1137 instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out);
1138
1139 /* tx buffer size must be a positive multiple of the stride */
1140 instance->tx_channel.buf_size = max(instance->tx_channel.stride,
1141 snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride));
1142
1143 /* rx buffer size must be a positive multiple of the endpoint maxpacket */
1144 maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0);
1145
1146 if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) {
1147 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__,
1148 usb_pipeendpoint(instance->rx_channel.endpoint));
1149 error = -EINVAL;
1150 goto fail_unbind;
1151 }
1152
1153 num_packets = max(1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */
1154
1155 if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE)
1156 num_packets--;
1157
1158 instance->rx_channel.buf_size = num_packets * maxpacket;
1159 instance->rx_channel.packet_size = maxpacket;
1160
1161 #ifdef DEBUG
1162 for (i = 0; i < 2; i++) {
1163 struct usbatm_channel *channel = i ?
1164 &instance->tx_channel : &instance->rx_channel;
1165
1166 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel);
1167 }
1168 #endif
1169
1170 /* initialize urbs */
1171
1172 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1173 u8 *buffer;
1174 struct usbatm_channel *channel = i < num_rcv_urbs ?
1175 &instance->rx_channel : &instance->tx_channel;
1176 struct urb *urb;
1177 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0;
1178
1179 UDSL_ASSERT(instance, !usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint));
1180
1181 urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
1182 if (!urb) {
1183 dev_err(dev, "%s: no memory for urb %d!\n", __func__, i);
1184 error = -ENOMEM;
1185 goto fail_unbind;
1186 }
1187
1188 instance->urbs[i] = urb;
1189
1190 /* zero the tx padding to avoid leaking information */
1191 buffer = kzalloc(channel->buf_size, GFP_KERNEL);
1192 if (!buffer) {
1193 dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i);
1194 error = -ENOMEM;
1195 goto fail_unbind;
1196 }
1197
1198 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
1199 buffer, channel->buf_size, usbatm_complete, channel);
1200 if (iso_packets) {
1201 int j;
1202 urb->interval = 1;
1203 urb->transfer_flags = URB_ISO_ASAP;
1204 urb->number_of_packets = iso_packets;
1205 for (j = 0; j < iso_packets; j++) {
1206 urb->iso_frame_desc[j].offset = channel->packet_size * j;
1207 urb->iso_frame_desc[j].length = channel->packet_size;
1208 }
1209 }
1210
1211 /* put all tx URBs on the list of spares */
1212 if (i >= num_rcv_urbs)
1213 list_add_tail(&urb->urb_list, &channel->list);
1214
1215 vdbg(&intf->dev, "%s: alloced buffer 0x%p buf size %u urb 0x%p",
1216 __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
1217 }
1218
1219 instance->cached_vpi = ATM_VPI_UNSPEC;
1220 instance->cached_vci = ATM_VCI_UNSPEC;
1221 instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL);
1222
1223 if (!instance->cell_buf) {
1224 dev_err(dev, "%s: no memory for cell buffer!\n", __func__);
1225 error = -ENOMEM;
1226 goto fail_unbind;
1227 }
1228
1229 if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) {
1230 error = usbatm_heavy_init(instance);
1231 } else {
1232 complete(&instance->thread_exited); /* pretend that heavy_init was run */
1233 error = usbatm_atm_init(instance);
1234 }
1235
1236 if (error < 0)
1237 goto fail_unbind;
1238
1239 usb_get_dev(usb_dev);
1240 usb_set_intfdata(intf, instance);
1241
1242 return 0;
1243
1244 fail_unbind:
1245 if (instance->driver->unbind)
1246 instance->driver->unbind(instance, intf);
1247 fail_free:
1248 kfree(instance->cell_buf);
1249
1250 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1251 if (instance->urbs[i])
1252 kfree(instance->urbs[i]->transfer_buffer);
1253 usb_free_urb(instance->urbs[i]);
1254 }
1255
1256 kfree(instance);
1257
1258 return error;
1259 }
1260 EXPORT_SYMBOL_GPL(usbatm_usb_probe);
1261
1262 void usbatm_usb_disconnect(struct usb_interface *intf)
1263 {
1264 struct device *dev = &intf->dev;
1265 struct usbatm_data *instance = usb_get_intfdata(intf);
1266 struct usbatm_vcc_data *vcc_data;
1267 int i;
1268
1269 dev_dbg(dev, "%s entered\n", __func__);
1270
1271 if (!instance) {
1272 dev_dbg(dev, "%s: NULL instance!\n", __func__);
1273 return;
1274 }
1275
1276 usb_set_intfdata(intf, NULL);
1277
1278 mutex_lock(&instance->serialize);
1279 instance->disconnected = 1;
1280 if (instance->thread != NULL)
1281 send_sig(SIGTERM, instance->thread, 1);
1282 mutex_unlock(&instance->serialize);
1283
1284 wait_for_completion(&instance->thread_exited);
1285
1286 mutex_lock(&instance->serialize);
1287 list_for_each_entry(vcc_data, &instance->vcc_list, list)
1288 vcc_release_async(vcc_data->vcc, -EPIPE);
1289 mutex_unlock(&instance->serialize);
1290
1291 tasklet_disable(&instance->rx_channel.tasklet);
1292 tasklet_disable(&instance->tx_channel.tasklet);
1293
1294 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
1295 usb_kill_urb(instance->urbs[i]);
1296
1297 del_timer_sync(&instance->rx_channel.delay);
1298 del_timer_sync(&instance->tx_channel.delay);
1299
1300 /* turn usbatm_[rt]x_process into something close to a no-op */
1301 /* no need to take the spinlock */
1302 INIT_LIST_HEAD(&instance->rx_channel.list);
1303 INIT_LIST_HEAD(&instance->tx_channel.list);
1304
1305 tasklet_enable(&instance->rx_channel.tasklet);
1306 tasklet_enable(&instance->tx_channel.tasklet);
1307
1308 if (instance->atm_dev && instance->driver->atm_stop)
1309 instance->driver->atm_stop(instance, instance->atm_dev);
1310
1311 if (instance->driver->unbind)
1312 instance->driver->unbind(instance, intf);
1313
1314 instance->driver_data = NULL;
1315
1316 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1317 kfree(instance->urbs[i]->transfer_buffer);
1318 usb_free_urb(instance->urbs[i]);
1319 }
1320
1321 kfree(instance->cell_buf);
1322
1323 /* ATM finalize */
1324 if (instance->atm_dev) {
1325 atm_dev_deregister(instance->atm_dev);
1326 instance->atm_dev = NULL;
1327 }
1328
1329 usbatm_put_instance(instance); /* taken in usbatm_usb_probe */
1330 }
1331 EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
1332
1333
1334 /***********
1335 ** init **
1336 ***********/
1337
1338 static int __init usbatm_usb_init(void)
1339 {
1340 if (sizeof(struct usbatm_control) > FIELD_SIZEOF(struct sk_buff, cb)) {
1341 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
1342 return -EIO;
1343 }
1344
1345 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1346 || (num_snd_urbs > UDSL_MAX_SND_URBS)
1347 || (rcv_buf_bytes < 1)
1348 || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE)
1349 || (snd_buf_bytes < 1)
1350 || (snd_buf_bytes > UDSL_MAX_BUF_SIZE))
1351 return -EINVAL;
1352
1353 return 0;
1354 }
1355 module_init(usbatm_usb_init);
1356
1357 static void __exit usbatm_usb_exit(void)
1358 {
1359 }
1360 module_exit(usbatm_usb_exit);
1361
1362 MODULE_AUTHOR(DRIVER_AUTHOR);
1363 MODULE_DESCRIPTION(DRIVER_DESC);
1364 MODULE_LICENSE("GPL");
1365 MODULE_VERSION(DRIVER_VERSION);
1366
1367 /************
1368 ** debug **
1369 ************/
1370
1371 #ifdef VERBOSE_DEBUG
1372 static int usbatm_print_packet(struct usbatm_data *instance,
1373 const unsigned char *data, int len)
1374 {
1375 unsigned char buffer[256];
1376 int i = 0, j = 0;
1377
1378 for (i = 0; i < len;) {
1379 buffer[0] = '\0';
1380 sprintf(buffer, "%.3d :", i);
1381 for (j = 0; (j < 16) && (i < len); j++, i++)
1382 sprintf(buffer, "%s %2.2x", buffer, data[i]);
1383 dev_dbg(&instance->usb_intf->dev, "%s", buffer);
1384 }
1385 return i;
1386 }
1387 #endif
Linus' kernel tree