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