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x86: move devmem_is_allowed() to common mm/init.c
[linux-2.6/mini2440.git] / drivers / usb / atm / usbatm.c
blobfbea8563df1ede695f0ccf7b5dc8d367c6f623dc
1 /******************************************************************************
2 * usbatm.c - Generic USB xDSL driver core
3 *
4 * Copyright (C) 2001, Alcatel
5 * Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas
6 * Copyright (C) 2004, David Woodhouse, Roman Kagan
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; either version 2 of the License, or (at your option)
11 * any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * more details.
17 *
18 * You should have received a copy of the GNU General Public License along with
19 * this program; if not, write to the Free Software Foundation, Inc., 59
20 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 *
22 ******************************************************************************/
23
24 /*
25 * Written by Johan Verrept, Duncan Sands (duncan.sands@free.fr) and David Woodhouse
26 *
27 * 1.7+: - See the check-in logs
28 *
29 * 1.6: - No longer opens a connection if the firmware is not loaded
30 * - Added support for the speedtouch 330
31 * - Removed the limit on the number of devices
32 * - Module now autoloads on device plugin
33 * - Merged relevant parts of sarlib
34 * - Replaced the kernel thread with a tasklet
35 * - New packet transmission code
36 * - Changed proc file contents
37 * - Fixed all known SMP races
38 * - Many fixes and cleanups
39 * - Various fixes by Oliver Neukum (oliver@neukum.name)
40 *
41 * 1.5A: - Version for inclusion in 2.5 series kernel
42 * - Modifications by Richard Purdie (rpurdie@rpsys.net)
43 * - made compatible with kernel 2.5.6 onwards by changing
44 * usbatm_usb_send_data_context->urb to a pointer and adding code
45 * to alloc and free it
46 * - remove_wait_queue() added to usbatm_atm_processqueue_thread()
47 *
48 * 1.5: - fixed memory leak when atmsar_decode_aal5 returned NULL.
49 * (reported by stephen.robinson@zen.co.uk)
50 *
51 * 1.4: - changed the spin_lock() under interrupt to spin_lock_irqsave()
52 * - unlink all active send urbs of a vcc that is being closed.
53 *
54 * 1.3.1: - added the version number
55 *
56 * 1.3: - Added multiple send urb support
57 * - fixed memory leak and vcc->tx_inuse starvation bug
58 * when not enough memory left in vcc.
59 *
60 * 1.2: - Fixed race condition in usbatm_usb_send_data()
61 * 1.1: - Turned off packet debugging
62 *
63 */
64
65 #include "usbatm.h"
66
67 #include <asm/uaccess.h>
68 #include <linux/crc32.h>
69 #include <linux/errno.h>
70 #include <linux/init.h>
71 #include <linux/interrupt.h>
72 #include <linux/kernel.h>
73 #include <linux/module.h>
74 #include <linux/moduleparam.h>
75 #include <linux/netdevice.h>
76 #include <linux/proc_fs.h>
77 #include <linux/sched.h>
78 #include <linux/signal.h>
79 #include <linux/slab.h>
80 #include <linux/stat.h>
81 #include <linux/timer.h>
82 #include <linux/wait.h>
83 #include <linux/kthread.h>
84
85 #ifdef VERBOSE_DEBUG
86 static int usbatm_print_packet(const unsigned char *data, int len);
87 #define PACKETDEBUG(arg...) usbatm_print_packet (arg)
88 #define vdbg(arg...) dbg (arg)
89 #else
90 #define PACKETDEBUG(arg...)
91 #define vdbg(arg...)
92 #endif
93
94 #define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
95 #define DRIVER_VERSION "1.10"
96 #define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION
97
98 static const char usbatm_driver_name[] = "usbatm";
99
100 #define UDSL_MAX_RCV_URBS 16
101 #define UDSL_MAX_SND_URBS 16
102 #define UDSL_MAX_BUF_SIZE 65536
103 #define UDSL_DEFAULT_RCV_URBS 4
104 #define UDSL_DEFAULT_SND_URBS 4
105 #define UDSL_DEFAULT_RCV_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
106 #define UDSL_DEFAULT_SND_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
107
108 #define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
109
110 #define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */
111
112 static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
113 static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
114 static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE;
115 static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE;
116
117 module_param(num_rcv_urbs, uint, S_IRUGO);
118 MODULE_PARM_DESC(num_rcv_urbs,
119 "Number of urbs used for reception (range: 0-"
120 __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
121 __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
122
123 module_param(num_snd_urbs, uint, S_IRUGO);
124 MODULE_PARM_DESC(num_snd_urbs,
125 "Number of urbs used for transmission (range: 0-"
126 __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
127 __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
128
129 module_param(rcv_buf_bytes, uint, S_IRUGO);
130 MODULE_PARM_DESC(rcv_buf_bytes,
131 "Size of the buffers used for reception, in bytes (range: 1-"
132 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
133 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
134
135 module_param(snd_buf_bytes, uint, S_IRUGO);
136 MODULE_PARM_DESC(snd_buf_bytes,
137 "Size of the buffers used for transmission, in bytes (range: 1-"
138 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
139 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
140
141
142 /* receive */
143
144 struct usbatm_vcc_data {
145 /* vpi/vci lookup */
146 struct list_head list;
147 short vpi;
148 int vci;
149 struct atm_vcc *vcc;
150
151 /* raw cell reassembly */
152 struct sk_buff *sarb;
153 };
154
155
156 /* send */
157
158 struct usbatm_control {
159 struct atm_skb_data atm;
160 u32 len;
161 u32 crc;
162 };
163
164 #define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb)
165
166
167 /* ATM */
168
169 static void usbatm_atm_dev_close(struct atm_dev *atm_dev);
170 static int usbatm_atm_open(struct atm_vcc *vcc);
171 static void usbatm_atm_close(struct atm_vcc *vcc);
172 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg);
173 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
174 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
175
176 static struct atmdev_ops usbatm_atm_devops = {
177 .dev_close = usbatm_atm_dev_close,
178 .open = usbatm_atm_open,
179 .close = usbatm_atm_close,
180 .ioctl = usbatm_atm_ioctl,
181 .send = usbatm_atm_send,
182 .proc_read = usbatm_atm_proc_read,
183 .owner = THIS_MODULE,
184 };
185
186
187 /***********
188 ** misc **
189 ***********/
190
191 static inline unsigned int usbatm_pdu_length(unsigned int length)
192 {
193 length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER;
194 return length - length % ATM_CELL_PAYLOAD;
195 }
196
197 static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
198 {
199 if (vcc->pop)
200 vcc->pop(vcc, skb);
201 else
202 dev_kfree_skb_any(skb);
203 }
204
205
206 /***********
207 ** urbs **
208 ************/
209
210 static struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
211 {
212 struct urb *urb;
213
214 spin_lock_irq(&channel->lock);
215 if (list_empty(&channel->list)) {
216 spin_unlock_irq(&channel->lock);
217 return NULL;
218 }
219
220 urb = list_entry(channel->list.next, struct urb, urb_list);
221 list_del(&urb->urb_list);
222 spin_unlock_irq(&channel->lock);
223
224 return urb;
225 }
226
227 static int usbatm_submit_urb(struct urb *urb)
228 {
229 struct usbatm_channel *channel = urb->context;
230 int ret;
231
232 vdbg("%s: submitting urb 0x%p, size %u",
233 __func__, urb, urb->transfer_buffer_length);
234
235 ret = usb_submit_urb(urb, GFP_ATOMIC);
236 if (ret) {
237 if (printk_ratelimit())
238 atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
239 __func__, urb, ret);
240
241 /* consider all errors transient and return the buffer back to the queue */
242 urb->status = -EAGAIN;
243 spin_lock_irq(&channel->lock);
244
245 /* must add to the front when sending; doesn't matter when receiving */
246 list_add(&urb->urb_list, &channel->list);
247
248 spin_unlock_irq(&channel->lock);
249
250 /* make sure the channel doesn't stall */
251 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
252 }
253
254 return ret;
255 }
256
257 static void usbatm_complete(struct urb *urb)
258 {
259 struct usbatm_channel *channel = urb->context;
260 unsigned long flags;
261 int status = urb->status;
262
263 vdbg("%s: urb 0x%p, status %d, actual_length %d",
264 __func__, urb, status, urb->actual_length);
265
266 /* usually in_interrupt(), but not always */
267 spin_lock_irqsave(&channel->lock, flags);
268
269 /* must add to the back when receiving; doesn't matter when sending */
270 list_add_tail(&urb->urb_list, &channel->list);
271
272 spin_unlock_irqrestore(&channel->lock, flags);
273
274 if (unlikely(status) &&
275 (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) ||
276 status != -EILSEQ ))
277 {
278 if (status == -ESHUTDOWN)
279 return;
280
281 if (printk_ratelimit())
282 atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n",
283 __func__, urb, status);
284 /* throttle processing in case of an error */
285 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
286 } else
287 tasklet_schedule(&channel->tasklet);
288 }
289
290
291 /*************
292 ** decode **
293 *************/
294
295 static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
296 short vpi, int vci)
297 {
298 struct usbatm_vcc_data *vcc_data;
299
300 list_for_each_entry(vcc_data, &instance->vcc_list, list)
301 if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi))
302 return vcc_data;
303 return NULL;
304 }
305
306 static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source)
307 {
308 struct atm_vcc *vcc;
309 struct sk_buff *sarb;
310 short vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4);
311 int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
312 u8 pti = ((source[3] & 0xe) >> 1);
313
314 vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
315
316 if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) {
317 instance->cached_vpi = vpi;
318 instance->cached_vci = vci;
319
320 instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci);
321
322 if (!instance->cached_vcc)
323 atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
324 }
325
326 if (!instance->cached_vcc)
327 return;
328
329 vcc = instance->cached_vcc->vcc;
330
331 /* OAM F5 end-to-end */
332 if (pti == ATM_PTI_E2EF5) {
333 if (printk_ratelimit())
334 atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
335 __func__, vpi, vci);
336 atomic_inc(&vcc->stats->rx_err);
337 return;
338 }
339
340 sarb = instance->cached_vcc->sarb;
341
342 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
343 atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
344 __func__, sarb->len, vcc);
345 /* discard cells already received */
346 skb_trim(sarb, 0);
347 UDSL_ASSERT(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("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
385
386 if (!(skb = dev_alloc_skb(length))) {
387 if (printk_ratelimit())
388 atm_err(instance, "%s: no memory for skb (length: %u)!\n",
389 __func__, length);
390 atomic_inc(&vcc->stats->rx_drop);
391 goto out;
392 }
393
394 vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
395
396 if (!atm_charge(vcc, skb->truesize)) {
397 atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
398 __func__, skb->truesize);
399 dev_kfree_skb_any(skb);
400 goto out; /* atm_charge increments rx_drop */
401 }
402
403 skb_copy_to_linear_data(skb,
404 skb_tail_pointer(sarb) - pdu_length,
405 length);
406 __skb_put(skb, length);
407
408 vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
409 __func__, skb, skb->len, skb->truesize);
410
411 PACKETDEBUG(skb->data, skb->len);
412
413 vcc->push(vcc, skb);
414
415 atomic_inc(&vcc->stats->rx);
416 out:
417 skb_trim(sarb, 0);
418 }
419 }
420
421 static void usbatm_extract_cells(struct usbatm_data *instance,
422 unsigned char *source, unsigned int avail_data)
423 {
424 unsigned int stride = instance->rx_channel.stride;
425 unsigned int buf_usage = instance->buf_usage;
426
427 /* extract cells from incoming data, taking into account that
428 * the length of avail data may not be a multiple of stride */
429
430 if (buf_usage > 0) {
431 /* we have a partially received atm cell */
432 unsigned char *cell_buf = instance->cell_buf;
433 unsigned int space_left = stride - buf_usage;
434
435 UDSL_ASSERT(instance, buf_usage <= stride);
436
437 if (avail_data >= space_left) {
438 /* add new data and process cell */
439 memcpy(cell_buf + buf_usage, source, space_left);
440 source += space_left;
441 avail_data -= space_left;
442 usbatm_extract_one_cell(instance, cell_buf);
443 instance->buf_usage = 0;
444 } else {
445 /* not enough data to fill the cell */
446 memcpy(cell_buf + buf_usage, source, avail_data);
447 instance->buf_usage = buf_usage + avail_data;
448 return;
449 }
450 }
451
452 for (; avail_data >= stride; avail_data -= stride, source += stride)
453 usbatm_extract_one_cell(instance, source);
454
455 if (avail_data > 0) {
456 /* length was not a multiple of stride -
457 * save remaining data for next call */
458 memcpy(instance->cell_buf, source, avail_data);
459 instance->buf_usage = avail_data;
460 }
461 }
462
463
464 /*************
465 ** encode **
466 *************/
467
468 static unsigned int usbatm_write_cells(struct usbatm_data *instance,
469 struct sk_buff *skb,
470 u8 *target, unsigned int avail_space)
471 {
472 struct usbatm_control *ctrl = UDSL_SKB(skb);
473 struct atm_vcc *vcc = ctrl->atm.vcc;
474 unsigned int bytes_written;
475 unsigned int stride = instance->tx_channel.stride;
476
477 vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space);
478 UDSL_ASSERT(instance, !(avail_space % stride));
479
480 for (bytes_written = 0; bytes_written < avail_space && ctrl->len;
481 bytes_written += stride, target += stride) {
482 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
483 unsigned int left = ATM_CELL_PAYLOAD - data_len;
484 u8 *ptr = target;
485
486 ptr[0] = vcc->vpi >> 4;
487 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
488 ptr[2] = vcc->vci >> 4;
489 ptr[3] = vcc->vci << 4;
490 ptr[4] = 0xec;
491 ptr += ATM_CELL_HEADER;
492
493 skb_copy_from_linear_data(skb, ptr, data_len);
494 ptr += data_len;
495 __skb_pull(skb, data_len);
496
497 if(!left)
498 continue;
499
500 memset(ptr, 0, left);
501
502 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
503 u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
504 /* trailer[0] = 0; UU = 0 */
505 /* trailer[1] = 0; CPI = 0 */
506 trailer[2] = ctrl->len >> 8;
507 trailer[3] = ctrl->len;
508
509 ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4);
510
511 trailer[4] = ctrl->crc >> 24;
512 trailer[5] = ctrl->crc >> 16;
513 trailer[6] = ctrl->crc >> 8;
514 trailer[7] = ctrl->crc;
515
516 target[3] |= 0x2; /* adjust PTI */
517
518 ctrl->len = 0; /* tag this skb finished */
519 }
520 else
521 ctrl->crc = crc32_be(ctrl->crc, ptr, left);
522 }
523
524 return bytes_written;
525 }
526
527
528 /**************
529 ** receive **
530 **************/
531
532 static void usbatm_rx_process(unsigned long data)
533 {
534 struct usbatm_data *instance = (struct usbatm_data *)data;
535 struct urb *urb;
536
537 while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
538 vdbg("%s: processing urb 0x%p", __func__, urb);
539
540 if (usb_pipeisoc(urb->pipe)) {
541 unsigned char *merge_start = NULL;
542 unsigned int merge_length = 0;
543 const unsigned int packet_size = instance->rx_channel.packet_size;
544 int i;
545
546 for (i = 0; i < urb->number_of_packets; i++) {
547 if (!urb->iso_frame_desc[i].status) {
548 unsigned int actual_length = urb->iso_frame_desc[i].actual_length;
549
550 UDSL_ASSERT(instance, actual_length <= packet_size);
551
552 if (!merge_length)
553 merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
554 merge_length += actual_length;
555 if (merge_length && (actual_length < packet_size)) {
556 usbatm_extract_cells(instance, merge_start, merge_length);
557 merge_length = 0;
558 }
559 } else {
560 atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i);
561 if (merge_length)
562 usbatm_extract_cells(instance, merge_start, merge_length);
563 merge_length = 0;
564 instance->buf_usage = 0;
565 }
566 }
567
568 if (merge_length)
569 usbatm_extract_cells(instance, merge_start, merge_length);
570 } else
571 if (!urb->status)
572 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
573 else
574 instance->buf_usage = 0;
575
576 if (usbatm_submit_urb(urb))
577 return;
578 }
579 }
580
581
582 /***********
583 ** send **
584 ***********/
585
586 static void usbatm_tx_process(unsigned long data)
587 {
588 struct usbatm_data *instance = (struct usbatm_data *)data;
589 struct sk_buff *skb = instance->current_skb;
590 struct urb *urb = NULL;
591 const unsigned int buf_size = instance->tx_channel.buf_size;
592 unsigned int bytes_written = 0;
593 u8 *buffer = NULL;
594
595 if (!skb)
596 skb = skb_dequeue(&instance->sndqueue);
597
598 while (skb) {
599 if (!urb) {
600 urb = usbatm_pop_urb(&instance->tx_channel);
601 if (!urb)
602 break; /* no more senders */
603 buffer = urb->transfer_buffer;
604 bytes_written = (urb->status == -EAGAIN) ?
605 urb->transfer_buffer_length : 0;
606 }
607
608 bytes_written += usbatm_write_cells(instance, skb,
609 buffer + bytes_written,
610 buf_size - bytes_written);
611
612 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p",
613 __func__, bytes_written, skb, urb);
614
615 if (!UDSL_SKB(skb)->len) {
616 struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
617
618 usbatm_pop(vcc, skb);
619 atomic_inc(&vcc->stats->tx);
620
621 skb = skb_dequeue(&instance->sndqueue);
622 }
623
624 if (bytes_written == buf_size || (!skb && bytes_written)) {
625 urb->transfer_buffer_length = bytes_written;
626
627 if (usbatm_submit_urb(urb))
628 break;
629 urb = NULL;
630 }
631 }
632
633 instance->current_skb = skb;
634 }
635
636 static void usbatm_cancel_send(struct usbatm_data *instance,
637 struct atm_vcc *vcc)
638 {
639 struct sk_buff *skb, *n;
640
641 atm_dbg(instance, "%s entered\n", __func__);
642 spin_lock_irq(&instance->sndqueue.lock);
643 skb_queue_walk_safe(&instance->sndqueue, skb, n) {
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 }
650 spin_unlock_irq(&instance->sndqueue.lock);
651
652 tasklet_disable(&instance->tx_channel.tasklet);
653 if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
654 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
655 instance->current_skb = NULL;
656 usbatm_pop(vcc, skb);
657 }
658 tasklet_enable(&instance->tx_channel.tasklet);
659 atm_dbg(instance, "%s done\n", __func__);
660 }
661
662 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
663 {
664 struct usbatm_data *instance = vcc->dev->dev_data;
665 struct usbatm_control *ctrl = UDSL_SKB(skb);
666 int err;
667
668 vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);
669
670 /* racy disconnection check - fine */
671 if (!instance || instance->disconnected) {
672 #ifdef DEBUG
673 if (printk_ratelimit())
674 printk(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");
675 #endif
676 err = -ENODEV;
677 goto fail;
678 }
679
680 if (vcc->qos.aal != ATM_AAL5) {
681 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
682 err = -EINVAL;
683 goto fail;
684 }
685
686 if (skb->len > ATM_MAX_AAL5_PDU) {
687 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
688 __func__, skb->len, ATM_MAX_AAL5_PDU);
689 err = -EINVAL;
690 goto fail;
691 }
692
693 PACKETDEBUG(skb->data, skb->len);
694
695 /* initialize the control block */
696 ctrl->atm.vcc = vcc;
697 ctrl->len = skb->len;
698 ctrl->crc = crc32_be(~0, skb->data, skb->len);
699
700 skb_queue_tail(&instance->sndqueue, skb);
701 tasklet_schedule(&instance->tx_channel.tasklet);
702
703 return 0;
704
705 fail:
706 usbatm_pop(vcc, skb);
707 return err;
708 }
709
710
711 /********************
712 ** bean counting **
713 ********************/
714
715 static void usbatm_destroy_instance(struct kref *kref)
716 {
717 struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
718
719 dbg("%s", __func__);
720
721 tasklet_kill(&instance->rx_channel.tasklet);
722 tasklet_kill(&instance->tx_channel.tasklet);
723 usb_put_dev(instance->usb_dev);
724 kfree(instance);
725 }
726
727 static void usbatm_get_instance(struct usbatm_data *instance)
728 {
729 dbg("%s", __func__);
730
731 kref_get(&instance->refcount);
732 }
733
734 static void usbatm_put_instance(struct usbatm_data *instance)
735 {
736 dbg("%s", __func__);
737
738 kref_put(&instance->refcount, usbatm_destroy_instance);
739 }
740
741
742 /**********
743 ** ATM **
744 **********/
745
746 static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
747 {
748 struct usbatm_data *instance = atm_dev->dev_data;
749
750 dbg("%s", __func__);
751
752 if (!instance)
753 return;
754
755 atm_dev->dev_data = NULL; /* catch bugs */
756 usbatm_put_instance(instance); /* taken in usbatm_atm_init */
757 }
758
759 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
760 {
761 struct usbatm_data *instance = atm_dev->dev_data;
762 int left = *pos;
763
764 if (!instance) {
765 dbg("%s: NULL instance!", __func__);
766 return -ENODEV;
767 }
768
769 if (!left--)
770 return sprintf(page, "%s\n", instance->description);
771
772 if (!left--)
773 return sprintf(page, "MAC: %pM\n", atm_dev->esi);
774
775 if (!left--)
776 return sprintf(page,
777 "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
778 atomic_read(&atm_dev->stats.aal5.tx),
779 atomic_read(&atm_dev->stats.aal5.tx_err),
780 atomic_read(&atm_dev->stats.aal5.rx),
781 atomic_read(&atm_dev->stats.aal5.rx_err),
782 atomic_read(&atm_dev->stats.aal5.rx_drop));
783
784 if (!left--) {
785 if (instance->disconnected)
786 return sprintf(page, "Disconnected\n");
787 else
788 switch (atm_dev->signal) {
789 case ATM_PHY_SIG_FOUND:
790 return sprintf(page, "Line up\n");
791 case ATM_PHY_SIG_LOST:
792 return sprintf(page, "Line down\n");
793 default:
794 return sprintf(page, "Line state unknown\n");
795 }
796 }
797
798 return 0;
799 }
800
801 static int usbatm_atm_open(struct atm_vcc *vcc)
802 {
803 struct usbatm_data *instance = vcc->dev->dev_data;
804 struct usbatm_vcc_data *new = NULL;
805 int ret;
806 int vci = vcc->vci;
807 short vpi = vcc->vpi;
808
809 if (!instance) {
810 dbg("%s: NULL data!", __func__);
811 return -ENODEV;
812 }
813
814 atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci);
815
816 /* only support AAL5 */
817 if ((vcc->qos.aal != ATM_AAL5)) {
818 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
819 return -EINVAL;
820 }
821
822 /* sanity checks */
823 if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
824 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu);
825 return -EINVAL;
826 }
827
828 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */
829
830 if (instance->disconnected) {
831 atm_dbg(instance, "%s: disconnected!\n", __func__);
832 ret = -ENODEV;
833 goto fail;
834 }
835
836 if (usbatm_find_vcc(instance, vpi, vci)) {
837 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
838 ret = -EADDRINUSE;
839 goto fail;
840 }
841
842 if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) {
843 atm_err(instance, "%s: no memory for vcc_data!\n", __func__);
844 ret = -ENOMEM;
845 goto fail;
846 }
847
848 new->vcc = vcc;
849 new->vpi = vpi;
850 new->vci = vci;
851
852 new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
853 if (!new->sarb) {
854 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__);
855 ret = -ENOMEM;
856 goto fail;
857 }
858
859 vcc->dev_data = new;
860
861 tasklet_disable(&instance->rx_channel.tasklet);
862 instance->cached_vcc = new;
863 instance->cached_vpi = vpi;
864 instance->cached_vci = vci;
865 list_add(&new->list, &instance->vcc_list);
866 tasklet_enable(&instance->rx_channel.tasklet);
867
868 set_bit(ATM_VF_ADDR, &vcc->flags);
869 set_bit(ATM_VF_PARTIAL, &vcc->flags);
870 set_bit(ATM_VF_READY, &vcc->flags);
871
872 mutex_unlock(&instance->serialize);
873
874 atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
875
876 return 0;
877
878 fail:
879 kfree(new);
880 mutex_unlock(&instance->serialize);
881 return ret;
882 }
883
884 static void usbatm_atm_close(struct atm_vcc *vcc)
885 {
886 struct usbatm_data *instance = vcc->dev->dev_data;
887 struct usbatm_vcc_data *vcc_data = vcc->dev_data;
888
889 if (!instance || !vcc_data) {
890 dbg("%s: NULL data!", __func__);
891 return;
892 }
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 dbg("%s: %s!", __func__, instance ? "disconnected" : "NULL instance");
936 return -ENODEV;
937 }
938
939 switch (cmd) {
940 case ATM_QUERYLOOP:
941 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
942 default:
943 return -ENOIOCTLCMD;
944 }
945 }
946
947 static int usbatm_atm_init(struct usbatm_data *instance)
948 {
949 struct atm_dev *atm_dev;
950 int ret, i;
951
952 /* ATM init. The ATM initialization scheme suffers from an intrinsic race
953 * condition: callbacks we register can be executed at once, before we have
954 * initialized the struct atm_dev. To protect against this, all callbacks
955 * abort if atm_dev->dev_data is NULL. */
956 atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -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 ret = sysfs_create_link(&atm_dev->class_dev.kobj,
972 &instance->usb_intf->dev.kobj, "device");
973 if (ret) {
974 atm_err(instance, "%s: sysfs_create_link failed: %d\n",
975 __func__, ret);
976 goto fail_sysfs;
977 }
978
979 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
980 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
981 goto fail;
982 }
983
984 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */
985
986 /* ready for ATM callbacks */
987 mb();
988 atm_dev->dev_data = instance;
989
990 /* submit all rx URBs */
991 for (i = 0; i < num_rcv_urbs; i++)
992 usbatm_submit_urb(instance->urbs[i]);
993
994 return 0;
995
996 fail:
997 sysfs_remove_link(&atm_dev->class_dev.kobj, "device");
998 fail_sysfs:
999 instance->atm_dev = NULL;
1000 atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
1001 return ret;
1002 }
1003
1004
1005 /**********
1006 ** USB **
1007 **********/
1008
1009 static int usbatm_do_heavy_init(void *arg)
1010 {
1011 struct usbatm_data *instance = arg;
1012 int ret;
1013
1014 allow_signal(SIGTERM);
1015 complete(&instance->thread_started);
1016
1017 ret = instance->driver->heavy_init(instance, instance->usb_intf);
1018
1019 if (!ret)
1020 ret = usbatm_atm_init(instance);
1021
1022 mutex_lock(&instance->serialize);
1023 instance->thread = NULL;
1024 mutex_unlock(&instance->serialize);
1025
1026 complete_and_exit(&instance->thread_exited, ret);
1027 }
1028
1029 static int usbatm_heavy_init(struct usbatm_data *instance)
1030 {
1031 struct task_struct *t;
1032
1033 t = kthread_create(usbatm_do_heavy_init, instance,
1034 instance->driver->driver_name);
1035 if (IS_ERR(t)) {
1036 usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n",
1037 __func__, PTR_ERR(t));
1038 return PTR_ERR(t);
1039 }
1040
1041 instance->thread = t;
1042 wake_up_process(t);
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 = NULL;
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(instance, !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 != NULL)
1290 send_sig(SIGTERM, instance->thread, 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
Support for the Chinese Samsung S3C2440 based development boards