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[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/smp_lock.h>
81 #include <linux/stat.h>
82 #include <linux/timer.h>
83 #include <linux/wait.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
262 vdbg("%s: urb 0x%p, status %d, actual_length %d",
263 __func__, urb, urb->status, urb->actual_length);
264
265 /* usually in_interrupt(), but not always */
266 spin_lock_irqsave(&channel->lock, flags);
267
268 /* must add to the back when receiving; doesn't matter when sending */
269 list_add_tail(&urb->urb_list, &channel->list);
270
271 spin_unlock_irqrestore(&channel->lock, flags);
272
273 if (unlikely(urb->status) &&
274 (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) ||
275 urb->status != -EILSEQ ))
276 {
277 if (printk_ratelimit())
278 atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n",
279 __func__, urb, urb->status);
280 /* throttle processing in case of an error */
281 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
282 } else
283 tasklet_schedule(&channel->tasklet);
284 }
285
286
287 /*************
288 ** decode **
289 *************/
290
291 static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
292 short vpi, int vci)
293 {
294 struct usbatm_vcc_data *vcc_data;
295
296 list_for_each_entry(vcc_data, &instance->vcc_list, list)
297 if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi))
298 return vcc_data;
299 return NULL;
300 }
301
302 static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source)
303 {
304 struct atm_vcc *vcc;
305 struct sk_buff *sarb;
306 short vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4);
307 int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
308 u8 pti = ((source[3] & 0xe) >> 1);
309
310 vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
311
312 if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) {
313 instance->cached_vpi = vpi;
314 instance->cached_vci = vci;
315
316 instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci);
317
318 if (!instance->cached_vcc)
319 atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
320 }
321
322 if (!instance->cached_vcc)
323 return;
324
325 vcc = instance->cached_vcc->vcc;
326
327 /* OAM F5 end-to-end */
328 if (pti == ATM_PTI_E2EF5) {
329 if (printk_ratelimit())
330 atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
331 __func__, vpi, vci);
332 atomic_inc(&vcc->stats->rx_err);
333 return;
334 }
335
336 sarb = instance->cached_vcc->sarb;
337
338 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
339 atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
340 __func__, sarb->len, vcc);
341 /* discard cells already received */
342 skb_trim(sarb, 0);
343 UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end);
344 }
345
346 memcpy(sarb->tail, source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
347 __skb_put(sarb, ATM_CELL_PAYLOAD);
348
349 if (pti & 1) {
350 struct sk_buff *skb;
351 unsigned int length;
352 unsigned int pdu_length;
353
354 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
355
356 /* guard against overflow */
357 if (length > ATM_MAX_AAL5_PDU) {
358 atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
359 __func__, length, vcc);
360 atomic_inc(&vcc->stats->rx_err);
361 goto out;
362 }
363
364 pdu_length = usbatm_pdu_length(length);
365
366 if (sarb->len < pdu_length) {
367 atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
368 __func__, pdu_length, sarb->len, vcc);
369 atomic_inc(&vcc->stats->rx_err);
370 goto out;
371 }
372
373 if (crc32_be(~0, sarb->tail - pdu_length, pdu_length) != 0xc704dd7b) {
374 atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
375 __func__, vcc);
376 atomic_inc(&vcc->stats->rx_err);
377 goto out;
378 }
379
380 vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
381
382 if (!(skb = dev_alloc_skb(length))) {
383 if (printk_ratelimit())
384 atm_err(instance, "%s: no memory for skb (length: %u)!\n",
385 __func__, length);
386 atomic_inc(&vcc->stats->rx_drop);
387 goto out;
388 }
389
390 vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
391
392 if (!atm_charge(vcc, skb->truesize)) {
393 atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
394 __func__, skb->truesize);
395 dev_kfree_skb_any(skb);
396 goto out; /* atm_charge increments rx_drop */
397 }
398
399 memcpy(skb->data, sarb->tail - pdu_length, length);
400 __skb_put(skb, length);
401
402 vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
403 __func__, skb, skb->len, skb->truesize);
404
405 PACKETDEBUG(skb->data, skb->len);
406
407 vcc->push(vcc, skb);
408
409 atomic_inc(&vcc->stats->rx);
410 out:
411 skb_trim(sarb, 0);
412 }
413 }
414
415 static void usbatm_extract_cells(struct usbatm_data *instance,
416 unsigned char *source, unsigned int avail_data)
417 {
418 unsigned int stride = instance->rx_channel.stride;
419 unsigned int buf_usage = instance->buf_usage;
420
421 /* extract cells from incoming data, taking into account that
422 * the length of avail data may not be a multiple of stride */
423
424 if (buf_usage > 0) {
425 /* we have a partially received atm cell */
426 unsigned char *cell_buf = instance->cell_buf;
427 unsigned int space_left = stride - buf_usage;
428
429 UDSL_ASSERT(buf_usage <= stride);
430
431 if (avail_data >= space_left) {
432 /* add new data and process cell */
433 memcpy(cell_buf + buf_usage, source, space_left);
434 source += space_left;
435 avail_data -= space_left;
436 usbatm_extract_one_cell(instance, cell_buf);
437 instance->buf_usage = 0;
438 } else {
439 /* not enough data to fill the cell */
440 memcpy(cell_buf + buf_usage, source, avail_data);
441 instance->buf_usage = buf_usage + avail_data;
442 return;
443 }
444 }
445
446 for (; avail_data >= stride; avail_data -= stride, source += stride)
447 usbatm_extract_one_cell(instance, source);
448
449 if (avail_data > 0) {
450 /* length was not a multiple of stride -
451 * save remaining data for next call */
452 memcpy(instance->cell_buf, source, avail_data);
453 instance->buf_usage = avail_data;
454 }
455 }
456
457
458 /*************
459 ** encode **
460 *************/
461
462 static unsigned int usbatm_write_cells(struct usbatm_data *instance,
463 struct sk_buff *skb,
464 u8 *target, unsigned int avail_space)
465 {
466 struct usbatm_control *ctrl = UDSL_SKB(skb);
467 struct atm_vcc *vcc = ctrl->atm.vcc;
468 unsigned int bytes_written;
469 unsigned int stride = instance->tx_channel.stride;
470
471 vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space);
472 UDSL_ASSERT(!(avail_space % stride));
473
474 for (bytes_written = 0; bytes_written < avail_space && ctrl->len;
475 bytes_written += stride, target += stride) {
476 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
477 unsigned int left = ATM_CELL_PAYLOAD - data_len;
478 u8 *ptr = target;
479
480 ptr[0] = vcc->vpi >> 4;
481 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
482 ptr[2] = vcc->vci >> 4;
483 ptr[3] = vcc->vci << 4;
484 ptr[4] = 0xec;
485 ptr += ATM_CELL_HEADER;
486
487 memcpy(ptr, skb->data, data_len);
488 ptr += data_len;
489 __skb_pull(skb, data_len);
490
491 if(!left)
492 continue;
493
494 memset(ptr, 0, left);
495
496 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
497 u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
498 /* trailer[0] = 0; UU = 0 */
499 /* trailer[1] = 0; CPI = 0 */
500 trailer[2] = ctrl->len >> 8;
501 trailer[3] = ctrl->len;
502
503 ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4);
504
505 trailer[4] = ctrl->crc >> 24;
506 trailer[5] = ctrl->crc >> 16;
507 trailer[6] = ctrl->crc >> 8;
508 trailer[7] = ctrl->crc;
509
510 target[3] |= 0x2; /* adjust PTI */
511
512 ctrl->len = 0; /* tag this skb finished */
513 }
514 else
515 ctrl->crc = crc32_be(ctrl->crc, ptr, left);
516 }
517
518 return bytes_written;
519 }
520
521
522 /**************
523 ** receive **
524 **************/
525
526 static void usbatm_rx_process(unsigned long data)
527 {
528 struct usbatm_data *instance = (struct usbatm_data *)data;
529 struct urb *urb;
530
531 while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
532 vdbg("%s: processing urb 0x%p", __func__, urb);
533
534 if (usb_pipeisoc(urb->pipe)) {
535 unsigned char *merge_start = NULL;
536 unsigned int merge_length = 0;
537 const unsigned int packet_size = instance->rx_channel.packet_size;
538 int i;
539
540 for (i = 0; i < urb->number_of_packets; i++) {
541 if (!urb->iso_frame_desc[i].status) {
542 unsigned int actual_length = urb->iso_frame_desc[i].actual_length;
543
544 UDSL_ASSERT(actual_length <= packet_size);
545
546 if (!merge_length)
547 merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
548 merge_length += actual_length;
549 if (merge_length && (actual_length < packet_size)) {
550 usbatm_extract_cells(instance, merge_start, merge_length);
551 merge_length = 0;
552 }
553 } else {
554 atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i);
555 if (merge_length)
556 usbatm_extract_cells(instance, merge_start, merge_length);
557 merge_length = 0;
558 instance->buf_usage = 0;
559 }
560 }
561
562 if (merge_length)
563 usbatm_extract_cells(instance, merge_start, merge_length);
564 } else
565 if (!urb->status)
566 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
567 else
568 instance->buf_usage = 0;
569
570 if (usbatm_submit_urb(urb))
571 return;
572 }
573 }
574
575
576 /***********
577 ** send **
578 ***********/
579
580 static void usbatm_tx_process(unsigned long data)
581 {
582 struct usbatm_data *instance = (struct usbatm_data *)data;
583 struct sk_buff *skb = instance->current_skb;
584 struct urb *urb = NULL;
585 const unsigned int buf_size = instance->tx_channel.buf_size;
586 unsigned int bytes_written = 0;
587 u8 *buffer = NULL;
588
589 if (!skb)
590 skb = skb_dequeue(&instance->sndqueue);
591
592 while (skb) {
593 if (!urb) {
594 urb = usbatm_pop_urb(&instance->tx_channel);
595 if (!urb)
596 break; /* no more senders */
597 buffer = urb->transfer_buffer;
598 bytes_written = (urb->status == -EAGAIN) ?
599 urb->transfer_buffer_length : 0;
600 }
601
602 bytes_written += usbatm_write_cells(instance, skb,
603 buffer + bytes_written,
604 buf_size - bytes_written);
605
606 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p",
607 __func__, bytes_written, skb, urb);
608
609 if (!UDSL_SKB(skb)->len) {
610 struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
611
612 usbatm_pop(vcc, skb);
613 atomic_inc(&vcc->stats->tx);
614
615 skb = skb_dequeue(&instance->sndqueue);
616 }
617
618 if (bytes_written == buf_size || (!skb && bytes_written)) {
619 urb->transfer_buffer_length = bytes_written;
620
621 if (usbatm_submit_urb(urb))
622 break;
623 urb = NULL;
624 }
625 }
626
627 instance->current_skb = skb;
628 }
629
630 static void usbatm_cancel_send(struct usbatm_data *instance,
631 struct atm_vcc *vcc)
632 {
633 struct sk_buff *skb, *n;
634
635 atm_dbg(instance, "%s entered\n", __func__);
636 spin_lock_irq(&instance->sndqueue.lock);
637 for (skb = instance->sndqueue.next, n = skb->next;
638 skb != (struct sk_buff *)&instance->sndqueue;
639 skb = n, n = skb->next)
640 if (UDSL_SKB(skb)->atm.vcc == vcc) {
641 atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
642 __skb_unlink(skb, &instance->sndqueue);
643 usbatm_pop(vcc, skb);
644 }
645 spin_unlock_irq(&instance->sndqueue.lock);
646
647 tasklet_disable(&instance->tx_channel.tasklet);
648 if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
649 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
650 instance->current_skb = NULL;
651 usbatm_pop(vcc, skb);
652 }
653 tasklet_enable(&instance->tx_channel.tasklet);
654 atm_dbg(instance, "%s done\n", __func__);
655 }
656
657 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
658 {
659 struct usbatm_data *instance = vcc->dev->dev_data;
660 struct usbatm_control *ctrl = UDSL_SKB(skb);
661 int err;
662
663 vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);
664
665 /* racy disconnection check - fine */
666 if (!instance || instance->disconnected) {
667 #ifdef DEBUG
668 if (printk_ratelimit())
669 printk(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");
670 #endif
671 err = -ENODEV;
672 goto fail;
673 }
674
675 if (vcc->qos.aal != ATM_AAL5) {
676 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
677 err = -EINVAL;
678 goto fail;
679 }
680
681 if (skb->len > ATM_MAX_AAL5_PDU) {
682 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
683 __func__, skb->len, ATM_MAX_AAL5_PDU);
684 err = -EINVAL;
685 goto fail;
686 }
687
688 PACKETDEBUG(skb->data, skb->len);
689
690 /* initialize the control block */
691 ctrl->atm.vcc = vcc;
692 ctrl->len = skb->len;
693 ctrl->crc = crc32_be(~0, skb->data, skb->len);
694
695 skb_queue_tail(&instance->sndqueue, skb);
696 tasklet_schedule(&instance->tx_channel.tasklet);
697
698 return 0;
699
700 fail:
701 usbatm_pop(vcc, skb);
702 return err;
703 }
704
705
706 /********************
707 ** bean counting **
708 ********************/
709
710 static void usbatm_destroy_instance(struct kref *kref)
711 {
712 struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
713
714 dbg("%s", __func__);
715
716 tasklet_kill(&instance->rx_channel.tasklet);
717 tasklet_kill(&instance->tx_channel.tasklet);
718 usb_put_dev(instance->usb_dev);
719 kfree(instance);
720 }
721
722 static void usbatm_get_instance(struct usbatm_data *instance)
723 {
724 dbg("%s", __func__);
725
726 kref_get(&instance->refcount);
727 }
728
729 static void usbatm_put_instance(struct usbatm_data *instance)
730 {
731 dbg("%s", __func__);
732
733 kref_put(&instance->refcount, usbatm_destroy_instance);
734 }
735
736
737 /**********
738 ** ATM **
739 **********/
740
741 static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
742 {
743 struct usbatm_data *instance = atm_dev->dev_data;
744
745 dbg("%s", __func__);
746
747 if (!instance)
748 return;
749
750 atm_dev->dev_data = NULL; /* catch bugs */
751 usbatm_put_instance(instance); /* taken in usbatm_atm_init */
752 }
753
754 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
755 {
756 struct usbatm_data *instance = atm_dev->dev_data;
757 int left = *pos;
758
759 if (!instance) {
760 dbg("%s: NULL instance!", __func__);
761 return -ENODEV;
762 }
763
764 if (!left--)
765 return sprintf(page, "%s\n", instance->description);
766
767 if (!left--)
768 return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
769 atm_dev->esi[0], atm_dev->esi[1],
770 atm_dev->esi[2], atm_dev->esi[3],
771 atm_dev->esi[4], atm_dev->esi[5]);
772
773 if (!left--)
774 return sprintf(page,
775 "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
776 atomic_read(&atm_dev->stats.aal5.tx),
777 atomic_read(&atm_dev->stats.aal5.tx_err),
778 atomic_read(&atm_dev->stats.aal5.rx),
779 atomic_read(&atm_dev->stats.aal5.rx_err),
780 atomic_read(&atm_dev->stats.aal5.rx_drop));
781
782 if (!left--) {
783 if (instance->disconnected)
784 return sprintf(page, "Disconnected\n");
785 else
786 switch (atm_dev->signal) {
787 case ATM_PHY_SIG_FOUND:
788 return sprintf(page, "Line up\n");
789 case ATM_PHY_SIG_LOST:
790 return sprintf(page, "Line down\n");
791 default:
792 return sprintf(page, "Line state unknown\n");
793 }
794 }
795
796 return 0;
797 }
798
799 static int usbatm_atm_open(struct atm_vcc *vcc)
800 {
801 struct usbatm_data *instance = vcc->dev->dev_data;
802 struct usbatm_vcc_data *new = NULL;
803 int ret;
804 int vci = vcc->vci;
805 short vpi = vcc->vpi;
806
807 if (!instance) {
808 dbg("%s: NULL data!", __func__);
809 return -ENODEV;
810 }
811
812 atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci);
813
814 /* only support AAL5 */
815 if ((vcc->qos.aal != ATM_AAL5)) {
816 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
817 return -EINVAL;
818 }
819
820 /* sanity checks */
821 if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
822 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu);
823 return -EINVAL;
824 }
825
826 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */
827
828 if (instance->disconnected) {
829 atm_dbg(instance, "%s: disconnected!\n", __func__);
830 ret = -ENODEV;
831 goto fail;
832 }
833
834 if (usbatm_find_vcc(instance, vpi, vci)) {
835 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
836 ret = -EADDRINUSE;
837 goto fail;
838 }
839
840 if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) {
841 atm_err(instance, "%s: no memory for vcc_data!\n", __func__);
842 ret = -ENOMEM;
843 goto fail;
844 }
845
846 new->vcc = vcc;
847 new->vpi = vpi;
848 new->vci = vci;
849
850 new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
851 if (!new->sarb) {
852 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__);
853 ret = -ENOMEM;
854 goto fail;
855 }
856
857 vcc->dev_data = new;
858
859 tasklet_disable(&instance->rx_channel.tasklet);
860 instance->cached_vcc = new;
861 instance->cached_vpi = vpi;
862 instance->cached_vci = vci;
863 list_add(&new->list, &instance->vcc_list);
864 tasklet_enable(&instance->rx_channel.tasklet);
865
866 set_bit(ATM_VF_ADDR, &vcc->flags);
867 set_bit(ATM_VF_PARTIAL, &vcc->flags);
868 set_bit(ATM_VF_READY, &vcc->flags);
869
870 mutex_unlock(&instance->serialize);
871
872 atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
873
874 return 0;
875
876 fail:
877 kfree(new);
878 mutex_unlock(&instance->serialize);
879 return ret;
880 }
881
882 static void usbatm_atm_close(struct atm_vcc *vcc)
883 {
884 struct usbatm_data *instance = vcc->dev->dev_data;
885 struct usbatm_vcc_data *vcc_data = vcc->dev_data;
886
887 if (!instance || !vcc_data) {
888 dbg("%s: NULL data!", __func__);
889 return;
890 }
891
892 atm_dbg(instance, "%s entered\n", __func__);
893
894 atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n",
895 __func__, vcc_data, vcc_data->vpi, vcc_data->vci);
896
897 usbatm_cancel_send(instance, vcc);
898
899 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */
900
901 tasklet_disable(&instance->rx_channel.tasklet);
902 if (instance->cached_vcc == vcc_data) {
903 instance->cached_vcc = NULL;
904 instance->cached_vpi = ATM_VPI_UNSPEC;
905 instance->cached_vci = ATM_VCI_UNSPEC;
906 }
907 list_del(&vcc_data->list);
908 tasklet_enable(&instance->rx_channel.tasklet);
909
910 kfree_skb(vcc_data->sarb);
911 vcc_data->sarb = NULL;
912
913 kfree(vcc_data);
914 vcc->dev_data = NULL;
915
916 vcc->vpi = ATM_VPI_UNSPEC;
917 vcc->vci = ATM_VCI_UNSPEC;
918 clear_bit(ATM_VF_READY, &vcc->flags);
919 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
920 clear_bit(ATM_VF_ADDR, &vcc->flags);
921
922 mutex_unlock(&instance->serialize);
923
924 atm_dbg(instance, "%s successful\n", __func__);
925 }
926
927 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd,
928 void __user * arg)
929 {
930 struct usbatm_data *instance = atm_dev->dev_data;
931
932 if (!instance || instance->disconnected) {
933 dbg("%s: %s!", __func__, instance ? "disconnected" : "NULL instance");
934 return -ENODEV;
935 }
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, &usbatm_atm_devops, -1, NULL);
955 if (!atm_dev) {
956 usb_err(instance, "%s: failed to register ATM device!\n", __func__);
957 return -1;
958 }
959
960 instance->atm_dev = atm_dev;
961
962 atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
963 atm_dev->ci_range.vci_bits = ATM_CI_MAX;
964 atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
965
966 /* temp init ATM device, set to 128kbit */
967 atm_dev->link_rate = 128 * 1000 / 424;
968
969 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
970 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
971 goto fail;
972 }
973
974 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */
975
976 /* ready for ATM callbacks */
977 mb();
978 atm_dev->dev_data = instance;
979
980 /* submit all rx URBs */
981 for (i = 0; i < num_rcv_urbs; i++)
982 usbatm_submit_urb(instance->urbs[i]);
983
984 return 0;
985
986 fail:
987 instance->atm_dev = NULL;
988 atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
989 return ret;
990 }
991
992
993 /**********
994 ** USB **
995 **********/
996
997 static int usbatm_do_heavy_init(void *arg)
998 {
999 struct usbatm_data *instance = arg;
1000 int ret;
1001
1002 daemonize(instance->driver->driver_name);
1003 allow_signal(SIGTERM);
1004
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_pid = -1;
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 int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_KERNEL);
1022
1023 if (ret < 0) {
1024 usb_err(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret);
1025 return ret;
1026 }
1027
1028 mutex_lock(&instance->serialize);
1029 instance->thread_pid = ret;
1030 mutex_unlock(&instance->serialize);
1031
1032 wait_for_completion(&instance->thread_started);
1033
1034 return 0;
1035 }
1036
1037 static void usbatm_tasklet_schedule(unsigned long data)
1038 {
1039 tasklet_schedule((struct tasklet_struct *) data);
1040 }
1041
1042 static void usbatm_init_channel(struct usbatm_channel *channel)
1043 {
1044 spin_lock_init(&channel->lock);
1045 INIT_LIST_HEAD(&channel->list);
1046 channel->delay.function = usbatm_tasklet_schedule;
1047 channel->delay.data = (unsigned long) &channel->tasklet;
1048 init_timer(&channel->delay);
1049 }
1050
1051 int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
1052 struct usbatm_driver *driver)
1053 {
1054 struct device *dev = &intf->dev;
1055 struct usb_device *usb_dev = interface_to_usbdev(intf);
1056 struct usbatm_data *instance;
1057 char *buf;
1058 int error = -ENOMEM;
1059 int i, length;
1060 unsigned int maxpacket, num_packets;
1061
1062 dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n",
1063 __func__, driver->driver_name,
1064 le16_to_cpu(usb_dev->descriptor.idVendor),
1065 le16_to_cpu(usb_dev->descriptor.idProduct),
1066 intf->altsetting->desc.bInterfaceNumber);
1067
1068 /* instance init */
1069 instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
1070 if (!instance) {
1071 dev_err(dev, "%s: no memory for instance data!\n", __func__);
1072 return -ENOMEM;
1073 }
1074
1075 /* public fields */
1076
1077 instance->driver = driver;
1078 snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name);
1079
1080 instance->usb_dev = usb_dev;
1081 instance->usb_intf = intf;
1082
1083 buf = instance->description;
1084 length = sizeof(instance->description);
1085
1086 if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
1087 goto bind;
1088
1089 buf += i;
1090 length -= i;
1091
1092 i = scnprintf(buf, length, " (");
1093 buf += i;
1094 length -= i;
1095
1096 if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
1097 goto bind;
1098
1099 buf += i;
1100 length -= i;
1101
1102 snprintf(buf, length, ")");
1103
1104 bind:
1105 if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) {
1106 dev_err(dev, "%s: bind failed: %d!\n", __func__, error);
1107 goto fail_free;
1108 }
1109
1110 /* private fields */
1111
1112 kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */
1113 mutex_init(&instance->serialize);
1114
1115 instance->thread_pid = -1;
1116 init_completion(&instance->thread_started);
1117 init_completion(&instance->thread_exited);
1118
1119 INIT_LIST_HEAD(&instance->vcc_list);
1120 skb_queue_head_init(&instance->sndqueue);
1121
1122 usbatm_init_channel(&instance->rx_channel);
1123 usbatm_init_channel(&instance->tx_channel);
1124 tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
1125 tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
1126 instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
1127 instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
1128 instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
1129
1130 if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in)
1131 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in);
1132 else
1133 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in);
1134
1135 instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out);
1136
1137 /* tx buffer size must be a positive multiple of the stride */
1138 instance->tx_channel.buf_size = max (instance->tx_channel.stride,
1139 snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride));
1140
1141 /* rx buffer size must be a positive multiple of the endpoint maxpacket */
1142 maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0);
1143
1144 if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) {
1145 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__,
1146 usb_pipeendpoint(instance->rx_channel.endpoint));
1147 error = -EINVAL;
1148 goto fail_unbind;
1149 }
1150
1151 num_packets = max (1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */
1152
1153 if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE)
1154 num_packets--;
1155
1156 instance->rx_channel.buf_size = num_packets * maxpacket;
1157 instance->rx_channel.packet_size = maxpacket;
1158
1159 #ifdef DEBUG
1160 for (i = 0; i < 2; i++) {
1161 struct usbatm_channel *channel = i ?
1162 &instance->tx_channel : &instance->rx_channel;
1163
1164 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel);
1165 }
1166 #endif
1167
1168 /* initialize urbs */
1169
1170 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1171 u8 *buffer;
1172 struct usbatm_channel *channel = i < num_rcv_urbs ?
1173 &instance->rx_channel : &instance->tx_channel;
1174 struct urb *urb;
1175 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0;
1176
1177 UDSL_ASSERT(!usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint));
1178
1179 urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
1180 if (!urb) {
1181 dev_err(dev, "%s: no memory for urb %d!\n", __func__, i);
1182 error = -ENOMEM;
1183 goto fail_unbind;
1184 }
1185
1186 instance->urbs[i] = urb;
1187
1188 /* zero the tx padding to avoid leaking information */
1189 buffer = kzalloc(channel->buf_size, GFP_KERNEL);
1190 if (!buffer) {
1191 dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i);
1192 error = -ENOMEM;
1193 goto fail_unbind;
1194 }
1195
1196 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
1197 buffer, channel->buf_size, usbatm_complete, channel);
1198 if (iso_packets) {
1199 int j;
1200 urb->interval = 1;
1201 urb->transfer_flags = URB_ISO_ASAP;
1202 urb->number_of_packets = iso_packets;
1203 for (j = 0; j < iso_packets; j++) {
1204 urb->iso_frame_desc[j].offset = channel->packet_size * j;
1205 urb->iso_frame_desc[j].length = channel->packet_size;
1206 }
1207 }
1208
1209 /* put all tx URBs on the list of spares */
1210 if (i >= num_rcv_urbs)
1211 list_add_tail(&urb->urb_list, &channel->list);
1212
1213 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p",
1214 __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
1215 }
1216
1217 instance->cached_vpi = ATM_VPI_UNSPEC;
1218 instance->cached_vci = ATM_VCI_UNSPEC;
1219 instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL);
1220
1221 if (!instance->cell_buf) {
1222 dev_err(dev, "%s: no memory for cell buffer!\n", __func__);
1223 error = -ENOMEM;
1224 goto fail_unbind;
1225 }
1226
1227 if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) {
1228 error = usbatm_heavy_init(instance);
1229 } else {
1230 complete(&instance->thread_exited); /* pretend that heavy_init was run */
1231 error = usbatm_atm_init(instance);
1232 }
1233
1234 if (error < 0)
1235 goto fail_unbind;
1236
1237 usb_get_dev(usb_dev);
1238 usb_set_intfdata(intf, instance);
1239
1240 return 0;
1241
1242 fail_unbind:
1243 if (instance->driver->unbind)
1244 instance->driver->unbind(instance, intf);
1245 fail_free:
1246 kfree(instance->cell_buf);
1247
1248 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1249 if (instance->urbs[i])
1250 kfree(instance->urbs[i]->transfer_buffer);
1251 usb_free_urb(instance->urbs[i]);
1252 }
1253
1254 kfree (instance);
1255
1256 return error;
1257 }
1258 EXPORT_SYMBOL_GPL(usbatm_usb_probe);
1259
1260 void usbatm_usb_disconnect(struct usb_interface *intf)
1261 {
1262 struct device *dev = &intf->dev;
1263 struct usbatm_data *instance = usb_get_intfdata(intf);
1264 struct usbatm_vcc_data *vcc_data;
1265 int i;
1266
1267 dev_dbg(dev, "%s entered\n", __func__);
1268
1269 if (!instance) {
1270 dev_dbg(dev, "%s: NULL instance!\n", __func__);
1271 return;
1272 }
1273
1274 usb_set_intfdata(intf, NULL);
1275
1276 mutex_lock(&instance->serialize);
1277 instance->disconnected = 1;
1278 if (instance->thread_pid >= 0)
1279 kill_proc(instance->thread_pid, SIGTERM, 1);
1280 mutex_unlock(&instance->serialize);
1281
1282 wait_for_completion(&instance->thread_exited);
1283
1284 mutex_lock(&instance->serialize);
1285 list_for_each_entry(vcc_data, &instance->vcc_list, list)
1286 vcc_release_async(vcc_data->vcc, -EPIPE);
1287 mutex_unlock(&instance->serialize);
1288
1289 tasklet_disable(&instance->rx_channel.tasklet);
1290 tasklet_disable(&instance->tx_channel.tasklet);
1291
1292 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
1293 usb_kill_urb(instance->urbs[i]);
1294
1295 del_timer_sync(&instance->rx_channel.delay);
1296 del_timer_sync(&instance->tx_channel.delay);
1297
1298 /* turn usbatm_[rt]x_process into something close to a no-op */
1299 /* no need to take the spinlock */
1300 INIT_LIST_HEAD(&instance->rx_channel.list);
1301 INIT_LIST_HEAD(&instance->tx_channel.list);
1302
1303 tasklet_enable(&instance->rx_channel.tasklet);
1304 tasklet_enable(&instance->tx_channel.tasklet);
1305
1306 if (instance->atm_dev && instance->driver->atm_stop)
1307 instance->driver->atm_stop(instance, instance->atm_dev);
1308
1309 if (instance->driver->unbind)
1310 instance->driver->unbind(instance, intf);
1311
1312 instance->driver_data = NULL;
1313
1314 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1315 kfree(instance->urbs[i]->transfer_buffer);
1316 usb_free_urb(instance->urbs[i]);
1317 }
1318
1319 kfree(instance->cell_buf);
1320
1321 /* ATM finalize */
1322 if (instance->atm_dev)
1323 atm_dev_deregister(instance->atm_dev);
1324
1325 usbatm_put_instance(instance); /* taken in usbatm_usb_probe */
1326 }
1327 EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
1328
1329
1330 /***********
1331 ** init **
1332 ***********/
1333
1334 static int __init usbatm_usb_init(void)
1335 {
1336 dbg("%s: driver version %s", __func__, DRIVER_VERSION);
1337
1338 if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) {
1339 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
1340 return -EIO;
1341 }
1342
1343 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1344 || (num_snd_urbs > UDSL_MAX_SND_URBS)
1345 || (rcv_buf_bytes < 1)
1346 || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE)
1347 || (snd_buf_bytes < 1)
1348 || (snd_buf_bytes > UDSL_MAX_BUF_SIZE))
1349 return -EINVAL;
1350
1351 return 0;
1352 }
1353 module_init(usbatm_usb_init);
1354
1355 static void __exit usbatm_usb_exit(void)
1356 {
1357 dbg("%s", __func__);
1358 }
1359 module_exit(usbatm_usb_exit);
1360
1361 MODULE_AUTHOR(DRIVER_AUTHOR);
1362 MODULE_DESCRIPTION(DRIVER_DESC);
1363 MODULE_LICENSE("GPL");
1364 MODULE_VERSION(DRIVER_VERSION);
1365
1366 /************
1367 ** debug **
1368 ************/
1369
1370 #ifdef VERBOSE_DEBUG
1371 static int usbatm_print_packet(const unsigned char *data, int len)
1372 {
1373 unsigned char buffer[256];
1374 int i = 0, j = 0;
1375
1376 for (i = 0; i < len;) {
1377 buffer[0] = '\0';
1378 sprintf(buffer, "%.3d :", i);
1379 for (j = 0; (j < 16) && (i < len); j++, i++) {
1380 sprintf(buffer, "%s %2.2x", buffer, data[i]);
1381 }
1382 dbg("%s", buffer);
1383 }
1384 return i;
1385 }
1386 #endif
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