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[PATCH] USBATM: use dev_kfree_skb_any rather than dev_kfree_skb
[deliverable/linux.git] / drivers / usb / atm / usbatm.c
CommitLineData
c59bba75
DS		 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>
227d7761 75#include <linux/netdevice.h>
c59bba75
DS		 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
86static 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 "1.9"
96#define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION
97
98static 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_RCV_BUF_SIZE 1024 /* ATM cells */
103#define UDSL_MAX_SND_BUF_SIZE 1024 /* ATM cells */
104#define UDSL_DEFAULT_RCV_URBS 4
105#define UDSL_DEFAULT_SND_URBS 4
106#define UDSL_DEFAULT_RCV_BUF_SIZE 64 /* ATM cells */
107#define UDSL_DEFAULT_SND_BUF_SIZE 64 /* ATM cells */
108
109#define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
110
111#define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */
112
113static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
114static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
115static unsigned int rcv_buf_size = UDSL_DEFAULT_RCV_BUF_SIZE;
116static unsigned int snd_buf_size = UDSL_DEFAULT_SND_BUF_SIZE;
117
118module_param(num_rcv_urbs, uint, S_IRUGO);
119MODULE_PARM_DESC(num_rcv_urbs,
120 "Number of urbs used for reception (range: 0-"
121 __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
122 __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
123
124module_param(num_snd_urbs, uint, S_IRUGO);
125MODULE_PARM_DESC(num_snd_urbs,
126 "Number of urbs used for transmission (range: 0-"
127 __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
128 __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
129
130module_param(rcv_buf_size, uint, S_IRUGO);
131MODULE_PARM_DESC(rcv_buf_size,
132 "Size of the buffers used for reception in ATM cells (range: 1-"
133 __MODULE_STRING(UDSL_MAX_RCV_BUF_SIZE) ", default: "
134 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
135
136module_param(snd_buf_size, uint, S_IRUGO);
137MODULE_PARM_DESC(snd_buf_size,
138 "Size of the buffers used for transmission in ATM cells (range: 1-"
139 __MODULE_STRING(UDSL_MAX_SND_BUF_SIZE) ", default: "
140 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
141
142
143/* receive */
144
145struct usbatm_vcc_data {
146 /* vpi/vci lookup */
147 struct list_head list;
148 short vpi;
149 int vci;
150 struct atm_vcc *vcc;
151
152 /* raw cell reassembly */
153 struct sk_buff *sarb;
154};
155
156
157/* send */
158
159struct usbatm_control {
160 struct atm_skb_data atm;
161 u32 len;
162 u32 crc;
163};
164
165#define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb)
166
167
168/* ATM */
169
0ec3c7e8 170static void usbatm_atm_dev_close(struct atm_dev *atm_dev);
c59bba75
DS		 171static int usbatm_atm_open(struct atm_vcc *vcc);
172static void usbatm_atm_close(struct atm_vcc *vcc);
0ec3c7e8 173static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg);
c59bba75
DS		 174static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
175static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
176
177static struct atmdev_ops usbatm_atm_devops = {
178 .dev_close = usbatm_atm_dev_close,
179 .open = usbatm_atm_open,
180 .close = usbatm_atm_close,
181 .ioctl = usbatm_atm_ioctl,
182 .send = usbatm_atm_send,
183 .proc_read = usbatm_atm_proc_read,
184 .owner = THIS_MODULE,
185};
186
187
188/***********
189** misc **
190***********/
191
192static inline unsigned int usbatm_pdu_length(unsigned int length)
193{
194 length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER;
195 return length - length % ATM_CELL_PAYLOAD;
196}
197
198static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
199{
200 if (vcc->pop)
201 vcc->pop(vcc, skb);
202 else
227d7761 203 dev_kfree_skb_any(skb);
c59bba75
DS		 204}
205
206
207/***********
208** urbs **
209************/
210
858119e1 211static struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
c59bba75
DS		 212{
213 struct urb *urb;
214
215 spin_lock_irq(&channel->lock);
216 if (list_empty(&channel->list)) {
217 spin_unlock_irq(&channel->lock);
218 return NULL;
219 }
220
221 urb = list_entry(channel->list.next, struct urb, urb_list);
222 list_del(&urb->urb_list);
223 spin_unlock_irq(&channel->lock);
224
225 return urb;
226}
227
858119e1 228static int usbatm_submit_urb(struct urb *urb)
c59bba75
DS		 229{
230 struct usbatm_channel *channel = urb->context;
231 int ret;
232
233 vdbg("%s: submitting urb 0x%p, size %u",
234 __func__, urb, urb->transfer_buffer_length);
235
236 ret = usb_submit_urb(urb, GFP_ATOMIC);
237 if (ret) {
0ec3c7e8
DS		 238 if (printk_ratelimit())
239 atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
240 __func__, urb, ret);
c59bba75
DS		 241
242 /* consider all errors transient and return the buffer back to the queue */
243 urb->status = -EAGAIN;
244 spin_lock_irq(&channel->lock);
245
246 /* must add to the front when sending; doesn't matter when receiving */
247 list_add(&urb->urb_list, &channel->list);
248
249 spin_unlock_irq(&channel->lock);
250
251 /* make sure the channel doesn't stall */
252 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
253 }
254
255 return ret;
256}
257
258static void usbatm_complete(struct urb *urb, struct pt_regs *regs)
259{
260 struct usbatm_channel *channel = urb->context;
261 unsigned long flags;
262
263 vdbg("%s: urb 0x%p, status %d, actual_length %d",
264 __func__, urb, 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
0ec3c7e8
DS		 274 if (unlikely(urb->status)) {
275 if (printk_ratelimit())
276 atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n",
277 __func__, urb, urb->status);
c59bba75
DS		 278 /* throttle processing in case of an error */
279 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
0ec3c7e8 280 } else
c59bba75
DS		 281 tasklet_schedule(&channel->tasklet);
282}
283
284
285/*************
286** decode **
287*************/
288
289static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
290 short vpi, int vci)
291{
0ec3c7e8 292 struct usbatm_vcc_data *vcc_data;
c59bba75 293
0ec3c7e8
DS		 294 list_for_each_entry(vcc_data, &instance->vcc_list, list)
295 if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi))
296 return vcc_data;
c59bba75
DS		 297 return NULL;
298}
299
300static void usbatm_extract_cells(struct usbatm_data *instance,
301 unsigned char *source, unsigned int avail_data)
302{
303 struct usbatm_vcc_data *cached_vcc = NULL;
304 struct atm_vcc *vcc;
305 struct sk_buff *sarb;
c59bba75
DS		 306 unsigned int stride = instance->rx_channel.stride;
307 int vci, cached_vci = 0;
308 short vpi, cached_vpi = 0;
309 u8 pti;
310
311 for (; avail_data >= stride; avail_data -= stride, source += stride) {
312 vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4);
313 vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
314 pti = ((source[3] & 0xe) >> 1);
315
316 vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
317
e20d6645 318 if ((vci != cached_vci) || (vpi != cached_vpi)) {
c59bba75
DS		 319 cached_vpi = vpi;
320 cached_vci = vci;
e20d6645
DS		 321
322 cached_vcc = usbatm_find_vcc(instance, vpi, vci);
323
324 if (!cached_vcc)
0ec3c7e8 325 atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
c59bba75
DS		 326 }
327
e20d6645
DS		 328 if (!cached_vcc)
329 continue;
330
331 vcc = cached_vcc->vcc;
c59bba75
DS		 332
333 /* OAM F5 end-to-end */
334 if (pti == ATM_PTI_E2EF5) {
0ec3c7e8
DS		 335 if (printk_ratelimit())
336 atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
337 __func__, vpi, vci);
c59bba75
DS		 338 atomic_inc(&vcc->stats->rx_err);
339 continue;
340 }
341
e20d6645 342 sarb = cached_vcc->sarb;
c59bba75
DS		 343
344 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
0ec3c7e8 345 atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
c59bba75
DS		 346 __func__, sarb->len, vcc);
347 /* discard cells already received */
348 skb_trim(sarb, 0);
349 UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end);
350 }
351
352 memcpy(sarb->tail, source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
353 __skb_put(sarb, ATM_CELL_PAYLOAD);
354
355 if (pti & 1) {
356 struct sk_buff *skb;
357 unsigned int length;
358 unsigned int pdu_length;
359
360 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
361
362 /* guard against overflow */
363 if (length > ATM_MAX_AAL5_PDU) {
0ec3c7e8 364 atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
c59bba75
DS		 365 __func__, length, vcc);
366 atomic_inc(&vcc->stats->rx_err);
367 goto out;
368 }
369
370 pdu_length = usbatm_pdu_length(length);
371
372 if (sarb->len < pdu_length) {
0ec3c7e8 373 atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
c59bba75
DS		 374 __func__, pdu_length, sarb->len, vcc);
375 atomic_inc(&vcc->stats->rx_err);
376 goto out;
377 }
378
379 if (crc32_be(~0, sarb->tail - pdu_length, pdu_length) != 0xc704dd7b) {
0ec3c7e8 380 atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
c59bba75
DS		 381 __func__, vcc);
382 atomic_inc(&vcc->stats->rx_err);
383 goto out;
384 }
385
386 vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
387
388 if (!(skb = dev_alloc_skb(length))) {
0ec3c7e8
DS		 389 if (printk_ratelimit())
390 atm_err(instance, "%s: no memory for skb (length: %u)!\n",
391 __func__, length);
c59bba75
DS		 392 atomic_inc(&vcc->stats->rx_drop);
393 goto out;
394 }
395
396 vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
397
398 if (!atm_charge(vcc, skb->truesize)) {
0ec3c7e8
DS		 399 atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
400 __func__, skb->truesize);
227d7761 401 dev_kfree_skb_any(skb);
c59bba75
DS		 402 goto out; /* atm_charge increments rx_drop */
403 }
404
405 memcpy(skb->data, sarb->tail - pdu_length, 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
422
423/*************
424** encode **
425*************/
426
427static unsigned int usbatm_write_cells(struct usbatm_data *instance,
428 struct sk_buff *skb,
429 u8 *target, unsigned int avail_space)
430{
431 struct usbatm_control *ctrl = UDSL_SKB(skb);
432 struct atm_vcc *vcc = ctrl->atm.vcc;
433 unsigned int num_written;
434 unsigned int stride = instance->tx_channel.stride;
435
436 vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space);
437 UDSL_ASSERT(!(avail_space % stride));
438
439 for (num_written = 0; num_written < avail_space && ctrl->len;
440 num_written += stride, target += stride) {
441 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
442 unsigned int left = ATM_CELL_PAYLOAD - data_len;
443 u8 *ptr = target;
444
445 ptr[0] = vcc->vpi >> 4;
446 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
447 ptr[2] = vcc->vci >> 4;
448 ptr[3] = vcc->vci << 4;
449 ptr[4] = 0xec;
450 ptr += ATM_CELL_HEADER;
451
452 memcpy(ptr, skb->data, data_len);
453 ptr += data_len;
454 __skb_pull(skb, data_len);
455
456 if(!left)
457 continue;
458
459 memset(ptr, 0, left);
460
461 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
462 u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
463 /* trailer[0] = 0; UU = 0 */
464 /* trailer[1] = 0; CPI = 0 */
465 trailer[2] = ctrl->len >> 8;
466 trailer[3] = ctrl->len;
467
468 ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4);
469
470 trailer[4] = ctrl->crc >> 24;
471 trailer[5] = ctrl->crc >> 16;
472 trailer[6] = ctrl->crc >> 8;
473 trailer[7] = ctrl->crc;
474
475 target[3] |= 0x2; /* adjust PTI */
476
477 ctrl->len = 0; /* tag this skb finished */
478 }
479 else
480 ctrl->crc = crc32_be(ctrl->crc, ptr, left);
481 }
482
483 return num_written;
484}
485
486
487/**************
488** receive **
489**************/
490
491static void usbatm_rx_process(unsigned long data)
492{
493 struct usbatm_data *instance = (struct usbatm_data *)data;
494 struct urb *urb;
495
496 while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
497 vdbg("%s: processing urb 0x%p", __func__, urb);
498
499 if (usb_pipeisoc(urb->pipe)) {
500 int i;
501 for (i = 0; i < urb->number_of_packets; i++)
502 if (!urb->iso_frame_desc[i].status)
503 usbatm_extract_cells(instance,
504 (u8 *)urb->transfer_buffer + urb->iso_frame_desc[i].offset,
505 urb->iso_frame_desc[i].actual_length);
506 }
507 else
508 if (!urb->status)
509 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
510
511 if (usbatm_submit_urb(urb))
512 return;
513 }
514}
515
516
517/***********
518** send **
519***********/
520
521static void usbatm_tx_process(unsigned long data)
522{
523 struct usbatm_data *instance = (struct usbatm_data *)data;
524 struct sk_buff *skb = instance->current_skb;
525 struct urb *urb = NULL;
526 const unsigned int buf_size = instance->tx_channel.buf_size;
527 unsigned int num_written = 0;
528 u8 *buffer = NULL;
529
530 if (!skb)
531 skb = skb_dequeue(&instance->sndqueue);
532
533 while (skb) {
534 if (!urb) {
535 urb = usbatm_pop_urb(&instance->tx_channel);
536 if (!urb)
537 break; /* no more senders */
538 buffer = urb->transfer_buffer;
539 num_written = (urb->status == -EAGAIN) ?
540 urb->transfer_buffer_length : 0;
541 }
542
543 num_written += usbatm_write_cells(instance, skb,
544 buffer + num_written,
545 buf_size - num_written);
546
547 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p",
548 __func__, num_written, skb, urb);
549
550 if (!UDSL_SKB(skb)->len) {
551 struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
552
553 usbatm_pop(vcc, skb);
554 atomic_inc(&vcc->stats->tx);
555
556 skb = skb_dequeue(&instance->sndqueue);
557 }
558
559 if (num_written == buf_size || (!skb && num_written)) {
560 urb->transfer_buffer_length = num_written;
561
562 if (usbatm_submit_urb(urb))
563 break;
564 urb = NULL;
565 }
566 }
567
568 instance->current_skb = skb;
569}
570
571static void usbatm_cancel_send(struct usbatm_data *instance,
572 struct atm_vcc *vcc)
573{
574 struct sk_buff *skb, *n;
575
576 atm_dbg(instance, "%s entered\n", __func__);
577 spin_lock_irq(&instance->sndqueue.lock);
578 for (skb = instance->sndqueue.next, n = skb->next;
579 skb != (struct sk_buff *)&instance->sndqueue;
580 skb = n, n = skb->next)
581 if (UDSL_SKB(skb)->atm.vcc == vcc) {
582 atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
583 __skb_unlink(skb, &instance->sndqueue);
584 usbatm_pop(vcc, skb);
585 }
586 spin_unlock_irq(&instance->sndqueue.lock);
587
588 tasklet_disable(&instance->tx_channel.tasklet);
589 if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
590 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
591 instance->current_skb = NULL;
592 usbatm_pop(vcc, skb);
593 }
594 tasklet_enable(&instance->tx_channel.tasklet);
595 atm_dbg(instance, "%s done\n", __func__);
596}
597
598static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
599{
600 struct usbatm_data *instance = vcc->dev->dev_data;
601 struct usbatm_control *ctrl = UDSL_SKB(skb);
602 int err;
603
604 vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);
605
0e42a627
DS		 606 /* racy disconnection check - fine */
607 if (!instance || instance->disconnected) {
608#ifdef DEBUG
609 if (printk_ratelimit())
610 printk(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");
611#endif
c59bba75
DS		 612 err = -ENODEV;
613 goto fail;
614 }
615
616 if (vcc->qos.aal != ATM_AAL5) {
0ec3c7e8 617 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
c59bba75
DS		 618 err = -EINVAL;
619 goto fail;
620 }
621
622 if (skb->len > ATM_MAX_AAL5_PDU) {
0ec3c7e8 623 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
c59bba75
DS		 624 __func__, skb->len, ATM_MAX_AAL5_PDU);
625 err = -EINVAL;
626 goto fail;
627 }
628
629 PACKETDEBUG(skb->data, skb->len);
630
631 /* initialize the control block */
632 ctrl->atm.vcc = vcc;
633 ctrl->len = skb->len;
634 ctrl->crc = crc32_be(~0, skb->data, skb->len);
635
636 skb_queue_tail(&instance->sndqueue, skb);
637 tasklet_schedule(&instance->tx_channel.tasklet);
638
639 return 0;
640
641 fail:
642 usbatm_pop(vcc, skb);
643 return err;
644}
645
646
647/********************
648** bean counting **
649********************/
650
651static void usbatm_destroy_instance(struct kref *kref)
652{
653 struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
654
655 dbg("%s", __func__);
656
657 tasklet_kill(&instance->rx_channel.tasklet);
658 tasklet_kill(&instance->tx_channel.tasklet);
659 usb_put_dev(instance->usb_dev);
660 kfree(instance);
661}
662
3d48586c 663static void usbatm_get_instance(struct usbatm_data *instance)
c59bba75
DS		 664{
665 dbg("%s", __func__);
666
667 kref_get(&instance->refcount);
668}
669
3d48586c 670static void usbatm_put_instance(struct usbatm_data *instance)
c59bba75
DS		 671{
672 dbg("%s", __func__);
673
674 kref_put(&instance->refcount, usbatm_destroy_instance);
675}
676
677
678/**********
679** ATM **
680**********/
681
0ec3c7e8 682static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
c59bba75 683{
0ec3c7e8 684 struct usbatm_data *instance = atm_dev->dev_data;
c59bba75
DS		 685
686 dbg("%s", __func__);
687
688 if (!instance)
689 return;
690
0ec3c7e8 691 atm_dev->dev_data = NULL; /* catch bugs */
c59bba75
DS		 692 usbatm_put_instance(instance); /* taken in usbatm_atm_init */
693}
694
695static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
696{
697 struct usbatm_data *instance = atm_dev->dev_data;
698 int left = *pos;
699
700 if (!instance) {
701 dbg("%s: NULL instance!", __func__);
702 return -ENODEV;
703 }
704
705 if (!left--)
706 return sprintf(page, "%s\n", instance->description);
707
708 if (!left--)
709 return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
710 atm_dev->esi[0], atm_dev->esi[1],
711 atm_dev->esi[2], atm_dev->esi[3],
712 atm_dev->esi[4], atm_dev->esi[5]);
713
714 if (!left--)
715 return sprintf(page,
716 "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
717 atomic_read(&atm_dev->stats.aal5.tx),
718 atomic_read(&atm_dev->stats.aal5.tx_err),
719 atomic_read(&atm_dev->stats.aal5.rx),
720 atomic_read(&atm_dev->stats.aal5.rx_err),
721 atomic_read(&atm_dev->stats.aal5.rx_drop));
722
0e42a627
DS		 723 if (!left--) {
724 if (instance->disconnected)
725 return sprintf(page, "Disconnected\n");
726 else
727 switch (atm_dev->signal) {
728 case ATM_PHY_SIG_FOUND:
729 return sprintf(page, "Line up\n");
730 case ATM_PHY_SIG_LOST:
731 return sprintf(page, "Line down\n");
732 default:
733 return sprintf(page, "Line state unknown\n");
734 }
735 }
c59bba75
DS		 736
737 return 0;
738}
739
740static int usbatm_atm_open(struct atm_vcc *vcc)
741{
742 struct usbatm_data *instance = vcc->dev->dev_data;
743 struct usbatm_vcc_data *new = NULL;
744 int ret;
745 int vci = vcc->vci;
746 short vpi = vcc->vpi;
747
748 if (!instance) {
749 dbg("%s: NULL data!", __func__);
750 return -ENODEV;
751 }
752
753 atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci);
754
755 /* only support AAL5 */
0ec3c7e8
DS		 756 if ((vcc->qos.aal != ATM_AAL5)) {
757 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
758 return -EINVAL;
759 }
760
761 /* sanity checks */
762 if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
763 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu);
c59bba75
DS		 764 return -EINVAL;
765 }
766
0ec3c7e8 767 down(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */
c59bba75 768
0e42a627
DS		 769 if (instance->disconnected) {
770 atm_dbg(instance, "%s: disconnected!\n", __func__);
771 ret = -ENODEV;
772 goto fail;
773 }
774
c59bba75
DS		 775 if (usbatm_find_vcc(instance, vpi, vci)) {
776 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
777 ret = -EADDRINUSE;
778 goto fail;
779 }
780
9a734efe 781 if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) {
0ec3c7e8 782 atm_err(instance, "%s: no memory for vcc_data!\n", __func__);
c59bba75
DS		 783 ret = -ENOMEM;
784 goto fail;
785 }
786
c59bba75
DS		 787 new->vcc = vcc;
788 new->vpi = vpi;
789 new->vci = vci;
790
791 new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
792 if (!new->sarb) {
0ec3c7e8 793 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__);
c59bba75
DS		 794 ret = -ENOMEM;
795 goto fail;
796 }
797
798 vcc->dev_data = new;
799
800 tasklet_disable(&instance->rx_channel.tasklet);
801 list_add(&new->list, &instance->vcc_list);
802 tasklet_enable(&instance->rx_channel.tasklet);
803
804 set_bit(ATM_VF_ADDR, &vcc->flags);
805 set_bit(ATM_VF_PARTIAL, &vcc->flags);
806 set_bit(ATM_VF_READY, &vcc->flags);
807
808 up(&instance->serialize);
809
810 atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
811
812 return 0;
813
814fail:
815 kfree(new);
816 up(&instance->serialize);
817 return ret;
818}
819
820static void usbatm_atm_close(struct atm_vcc *vcc)
821{
822 struct usbatm_data *instance = vcc->dev->dev_data;
823 struct usbatm_vcc_data *vcc_data = vcc->dev_data;
824
825 if (!instance || !vcc_data) {
826 dbg("%s: NULL data!", __func__);
827 return;
828 }
829
830 atm_dbg(instance, "%s entered\n", __func__);
831
832 atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n",
833 __func__, vcc_data, vcc_data->vpi, vcc_data->vci);
834
835 usbatm_cancel_send(instance, vcc);
836
0ec3c7e8 837 down(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */
c59bba75
DS		 838
839 tasklet_disable(&instance->rx_channel.tasklet);
840 list_del(&vcc_data->list);
841 tasklet_enable(&instance->rx_channel.tasklet);
842
843 kfree_skb(vcc_data->sarb);
844 vcc_data->sarb = NULL;
845
846 kfree(vcc_data);
847 vcc->dev_data = NULL;
848
849 vcc->vpi = ATM_VPI_UNSPEC;
850 vcc->vci = ATM_VCI_UNSPEC;
851 clear_bit(ATM_VF_READY, &vcc->flags);
852 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
853 clear_bit(ATM_VF_ADDR, &vcc->flags);
854
855 up(&instance->serialize);
856
857 atm_dbg(instance, "%s successful\n", __func__);
858}
859
0ec3c7e8 860static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd,
c59bba75
DS		 861 void __user * arg)
862{
0e42a627
DS		 863 struct usbatm_data *instance = atm_dev->dev_data;
864
865 if (!instance || instance->disconnected) {
866 dbg("%s: %s!", __func__, instance ? "disconnected" : "NULL instance");
867 return -ENODEV;
868 }
869
c59bba75
DS		 870 switch (cmd) {
871 case ATM_QUERYLOOP:
872 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
873 default:
874 return -ENOIOCTLCMD;
875 }
876}
877
878static int usbatm_atm_init(struct usbatm_data *instance)
879{
880 struct atm_dev *atm_dev;
881 int ret, i;
882
0ec3c7e8
DS		 883 /* ATM init. The ATM initialization scheme suffers from an intrinsic race
884 * condition: callbacks we register can be executed at once, before we have
885 * initialized the struct atm_dev. To protect against this, all callbacks
886 * abort if atm_dev->dev_data is NULL. */
c59bba75
DS		 887 atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL);
888 if (!atm_dev) {
0ec3c7e8 889 usb_err(instance, "%s: failed to register ATM device!\n", __func__);
c59bba75
DS		 890 return -1;
891 }
892
893 instance->atm_dev = atm_dev;
894
895 atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
896 atm_dev->ci_range.vci_bits = ATM_CI_MAX;
897 atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
898
899 /* temp init ATM device, set to 128kbit */
900 atm_dev->link_rate = 128 * 1000 / 424;
901
902 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
0ec3c7e8 903 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
c59bba75
DS		 904 goto fail;
905 }
906
c59bba75 907 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */
0ec3c7e8
DS		 908
909 /* ready for ATM callbacks */
c59bba75
DS		 910 mb();
911 atm_dev->dev_data = instance;
912
913 /* submit all rx URBs */
914 for (i = 0; i < num_rcv_urbs; i++)
915 usbatm_submit_urb(instance->urbs[i]);
916
917 return 0;
918
919 fail:
920 instance->atm_dev = NULL;
64bf69dd 921 atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
c59bba75
DS		 922 return ret;
923}
924
925
926/**********
927** USB **
928**********/
929
930static int usbatm_do_heavy_init(void *arg)
931{
932 struct usbatm_data *instance = arg;
933 int ret;
934
935 daemonize(instance->driver->driver_name);
936 allow_signal(SIGTERM);
937
938 complete(&instance->thread_started);
939
940 ret = instance->driver->heavy_init(instance, instance->usb_intf);
941
942 if (!ret)
943 ret = usbatm_atm_init(instance);
944
945 down(&instance->serialize);
946 instance->thread_pid = -1;
947 up(&instance->serialize);
948
949 complete_and_exit(&instance->thread_exited, ret);
950}
951
952static int usbatm_heavy_init(struct usbatm_data *instance)
953{
954 int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_KERNEL);
955
956 if (ret < 0) {
0ec3c7e8 957 usb_err(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret);
c59bba75
DS		 958 return ret;
959 }
960
961 down(&instance->serialize);
962 instance->thread_pid = ret;
963 up(&instance->serialize);
964
965 wait_for_completion(&instance->thread_started);
966
967 return 0;
968}
969
970static void usbatm_tasklet_schedule(unsigned long data)
971{
972 tasklet_schedule((struct tasklet_struct *) data);
973}
974
975static inline void usbatm_init_channel(struct usbatm_channel *channel)
976{
977 spin_lock_init(&channel->lock);
978 INIT_LIST_HEAD(&channel->list);
979 channel->delay.function = usbatm_tasklet_schedule;
980 channel->delay.data = (unsigned long) &channel->tasklet;
981 init_timer(&channel->delay);
982}
983
984int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
985 struct usbatm_driver *driver)
986{
987 struct device *dev = &intf->dev;
988 struct usb_device *usb_dev = interface_to_usbdev(intf);
989 struct usbatm_data *instance;
990 char *buf;
991 int error = -ENOMEM;
992 int i, length;
c59bba75 993
0ec3c7e8 994 dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n",
c59bba75
DS		 995 __func__, driver->driver_name,
996 le16_to_cpu(usb_dev->descriptor.idVendor),
997 le16_to_cpu(usb_dev->descriptor.idProduct),
998 intf->altsetting->desc.bInterfaceNumber);
999
1000 /* instance init */
7b842b6e 1001 instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
c59bba75 1002 if (!instance) {
0ec3c7e8 1003 dev_err(dev, "%s: no memory for instance data!\n", __func__);
c59bba75
DS		 1004 return -ENOMEM;
1005 }
1006
c59bba75
DS		 1007 /* public fields */
1008
1009 instance->driver = driver;
1010 snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name);
1011
1012 instance->usb_dev = usb_dev;
1013 instance->usb_intf = intf;
1014
1015 buf = instance->description;
1016 length = sizeof(instance->description);
1017
1018 if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
1019 goto bind;
1020
1021 buf += i;
1022 length -= i;
1023
1024 i = scnprintf(buf, length, " (");
1025 buf += i;
1026 length -= i;
1027
1028 if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
1029 goto bind;
1030
1031 buf += i;
1032 length -= i;
1033
1034 snprintf(buf, length, ")");
1035
1036 bind:
35644b0c 1037 if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) {
0ec3c7e8 1038 dev_err(dev, "%s: bind failed: %d!\n", __func__, error);
c59bba75
DS		 1039 goto fail_free;
1040 }
1041
1042 /* private fields */
1043
1044 kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */
1045 init_MUTEX(&instance->serialize);
1046
1047 instance->thread_pid = -1;
1048 init_completion(&instance->thread_started);
1049 init_completion(&instance->thread_exited);
1050
1051 INIT_LIST_HEAD(&instance->vcc_list);
1052
1053 usbatm_init_channel(&instance->rx_channel);
1054 usbatm_init_channel(&instance->tx_channel);
1055 tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
1056 tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
1057 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->in);
1058 instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->out);
1059 instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
1060 instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
1061 instance->rx_channel.buf_size = rcv_buf_size * instance->rx_channel.stride;
1062 instance->tx_channel.buf_size = snd_buf_size * instance->tx_channel.stride;
1063 instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
1064
1065 skb_queue_head_init(&instance->sndqueue);
1066
1067 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1068 struct urb *urb;
1069 u8 *buffer;
1070 unsigned int iso_packets = 0, iso_size = 0;
1071 struct usbatm_channel *channel = i < num_rcv_urbs ?
1072 &instance->rx_channel : &instance->tx_channel;
1073
1074 if (usb_pipeisoc(channel->endpoint)) {
1075 /* don't expect iso out endpoints */
1076 iso_size = usb_maxpacket(instance->usb_dev, channel->endpoint, 0);
1077 iso_size -= iso_size % channel->stride; /* alignment */
1078 BUG_ON(!iso_size);
1079 iso_packets = (channel->buf_size - 1) / iso_size + 1;
1080 }
1081
1082 urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
1083 if (!urb) {
0ec3c7e8 1084 dev_err(dev, "%s: no memory for urb %d!\n", __func__, i);
72ef8ab4 1085 error = -ENOMEM;
c59bba75
DS		 1086 goto fail_unbind;
1087 }
1088
65412e48
DS		 1089 instance->urbs[i] = urb;
1090
9a734efe
DS		 1091 /* zero the tx padding to avoid leaking information */
1092 buffer = kzalloc(channel->buf_size, GFP_KERNEL);
c59bba75 1093 if (!buffer) {
0ec3c7e8 1094 dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i);
72ef8ab4 1095 error = -ENOMEM;
c59bba75
DS		 1096 goto fail_unbind;
1097 }
c59bba75
DS		 1098
1099 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
1100 buffer, channel->buf_size, usbatm_complete, channel);
1101 if (iso_packets) {
1102 int j;
1103 urb->interval = 1;
1104 urb->transfer_flags = URB_ISO_ASAP;
1105 urb->number_of_packets = iso_packets;
1106 for (j = 0; j < iso_packets; j++) {
1107 urb->iso_frame_desc[j].offset = iso_size * j;
1108 urb->iso_frame_desc[j].length = min_t(int, iso_size,
1109 channel->buf_size - urb->iso_frame_desc[j].offset);
1110 }
1111 }
1112
1113 /* put all tx URBs on the list of spares */
1114 if (i >= num_rcv_urbs)
1115 list_add_tail(&urb->urb_list, &channel->list);
1116
1117 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p",
1118 __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
c59bba75
DS		 1119 }
1120
35644b0c 1121 if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) {
c59bba75
DS		 1122 error = usbatm_heavy_init(instance);
1123 } else {
1124 complete(&instance->thread_exited); /* pretend that heavy_init was run */
1125 error = usbatm_atm_init(instance);
1126 }
1127
1128 if (error < 0)
1129 goto fail_unbind;
1130
1131 usb_get_dev(usb_dev);
1132 usb_set_intfdata(intf, instance);
1133
1134 return 0;
1135
1136 fail_unbind:
1137 if (instance->driver->unbind)
1138 instance->driver->unbind(instance, intf);
1139 fail_free:
1140 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1141 if (instance->urbs[i])
1142 kfree(instance->urbs[i]->transfer_buffer);
1143 usb_free_urb(instance->urbs[i]);
1144 }
1145
1146 kfree (instance);
1147
1148 return error;
1149}
1150EXPORT_SYMBOL_GPL(usbatm_usb_probe);
1151
1152void usbatm_usb_disconnect(struct usb_interface *intf)
1153{
1154 struct device *dev = &intf->dev;
1155 struct usbatm_data *instance = usb_get_intfdata(intf);
0e42a627 1156 struct usbatm_vcc_data *vcc_data;
c59bba75
DS		 1157 int i;
1158
1159 dev_dbg(dev, "%s entered\n", __func__);
1160
1161 if (!instance) {
1162 dev_dbg(dev, "%s: NULL instance!\n", __func__);
1163 return;
1164 }
1165
1166 usb_set_intfdata(intf, NULL);
1167
1168 down(&instance->serialize);
0e42a627 1169 instance->disconnected = 1;
c59bba75
DS		 1170 if (instance->thread_pid >= 0)
1171 kill_proc(instance->thread_pid, SIGTERM, 1);
1172 up(&instance->serialize);
1173
1174 wait_for_completion(&instance->thread_exited);
1175
0e42a627
DS		 1176 down(&instance->serialize);
1177 list_for_each_entry(vcc_data, &instance->vcc_list, list)
1178 vcc_release_async(vcc_data->vcc, -EPIPE);
1179 up(&instance->serialize);
1180
c59bba75
DS		 1181 tasklet_disable(&instance->rx_channel.tasklet);
1182 tasklet_disable(&instance->tx_channel.tasklet);
1183
1184 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
1185 usb_kill_urb(instance->urbs[i]);
1186
1187 del_timer_sync(&instance->rx_channel.delay);
1188 del_timer_sync(&instance->tx_channel.delay);
1189
0e42a627
DS		 1190 /* turn usbatm_[rt]x_process into something close to a no-op */
1191 /* no need to take the spinlock */
1192 INIT_LIST_HEAD(&instance->rx_channel.list);
1193 INIT_LIST_HEAD(&instance->tx_channel.list);
1194
1195 tasklet_enable(&instance->rx_channel.tasklet);
1196 tasklet_enable(&instance->tx_channel.tasklet);
1197
c59bba75
DS		 1198 if (instance->atm_dev && instance->driver->atm_stop)
1199 instance->driver->atm_stop(instance, instance->atm_dev);
1200
1201 if (instance->driver->unbind)
1202 instance->driver->unbind(instance, intf);
1203
1204 instance->driver_data = NULL;
1205
c59bba75
DS		 1206 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1207 kfree(instance->urbs[i]->transfer_buffer);
1208 usb_free_urb(instance->urbs[i]);
1209 }
1210
1211 /* ATM finalize */
1212 if (instance->atm_dev)
64bf69dd 1213 atm_dev_deregister(instance->atm_dev);
c59bba75
DS		 1214
1215 usbatm_put_instance(instance); /* taken in usbatm_usb_probe */
1216}
1217EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
1218
1219
1220/***********
1221** init **
1222***********/
1223
1224static int __init usbatm_usb_init(void)
1225{
1226 dbg("%s: driver version %s", __func__, DRIVER_VERSION);
1227
1228 if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) {
1229 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
1230 return -EIO;
1231 }
1232
1233 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1234 || (num_snd_urbs > UDSL_MAX_SND_URBS)
1235 || (rcv_buf_size < 1)
1236 || (rcv_buf_size > UDSL_MAX_RCV_BUF_SIZE)
1237 || (snd_buf_size < 1)
1238 || (snd_buf_size > UDSL_MAX_SND_BUF_SIZE))
1239 return -EINVAL;
1240
1241 return 0;
1242}
1243module_init(usbatm_usb_init);
1244
1245static void __exit usbatm_usb_exit(void)
1246{
1247 dbg("%s", __func__);
1248}
1249module_exit(usbatm_usb_exit);
1250
1251MODULE_AUTHOR(DRIVER_AUTHOR);
1252MODULE_DESCRIPTION(DRIVER_DESC);
1253MODULE_LICENSE("GPL");
1254MODULE_VERSION(DRIVER_VERSION);
1255
1256/************
1257** debug **
1258************/
1259
1260#ifdef VERBOSE_DEBUG
1261static int usbatm_print_packet(const unsigned char *data, int len)
1262{
1263 unsigned char buffer[256];
1264 int i = 0, j = 0;
1265
1266 for (i = 0; i < len;) {
1267 buffer[0] = '\0';
1268 sprintf(buffer, "%.3d :", i);
1269 for (j = 0; (j < 16) && (i < len); j++, i++) {
1270 sprintf(buffer, "%s %2.2x", buffer, data[i]);
1271 }
1272 dbg("%s", buffer);
1273 }
1274 return i;
1275}
1276#endif
Linux kernel - Deliverables
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