Loading...
1/******************************************************************************
2 * usbatm.c - Generic USB xDSL driver core
3 *
4 * Copyright (C) 2001, Alcatel
5 * Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas
6 * Copyright (C) 2004, David Woodhouse, Roman Kagan
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; either version 2 of the License, or (at your option)
11 * any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * more details.
17 *
18 * You should have received a copy of the GNU General Public License along with
19 * this program; if not, write to the Free Software Foundation, Inc., 59
20 * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 *
22 ******************************************************************************/
23
24/*
25 * Written by Johan Verrept, Duncan Sands (duncan.sands@free.fr) and David Woodhouse
26 *
27 * 1.7+: - See the check-in logs
28 *
29 * 1.6: - No longer opens a connection if the firmware is not loaded
30 * - Added support for the speedtouch 330
31 * - Removed the limit on the number of devices
32 * - Module now autoloads on device plugin
33 * - Merged relevant parts of sarlib
34 * - Replaced the kernel thread with a tasklet
35 * - New packet transmission code
36 * - Changed proc file contents
37 * - Fixed all known SMP races
38 * - Many fixes and cleanups
39 * - Various fixes by Oliver Neukum (oliver@neukum.name)
40 *
41 * 1.5A: - Version for inclusion in 2.5 series kernel
42 * - Modifications by Richard Purdie (rpurdie@rpsys.net)
43 * - made compatible with kernel 2.5.6 onwards by changing
44 * usbatm_usb_send_data_context->urb to a pointer and adding code
45 * to alloc and free it
46 * - remove_wait_queue() added to usbatm_atm_processqueue_thread()
47 *
48 * 1.5: - fixed memory leak when atmsar_decode_aal5 returned NULL.
49 * (reported by stephen.robinson@zen.co.uk)
50 *
51 * 1.4: - changed the spin_lock() under interrupt to spin_lock_irqsave()
52 * - unlink all active send urbs of a vcc that is being closed.
53 *
54 * 1.3.1: - added the version number
55 *
56 * 1.3: - Added multiple send urb support
57 * - fixed memory leak and vcc->tx_inuse starvation bug
58 * when not enough memory left in vcc.
59 *
60 * 1.2: - Fixed race condition in usbatm_usb_send_data()
61 * 1.1: - Turned off packet debugging
62 *
63 */
64
65#include "usbatm.h"
66
67#include <asm/uaccess.h>
68#include <linux/crc32.h>
69#include <linux/errno.h>
70#include <linux/init.h>
71#include <linux/interrupt.h>
72#include <linux/kernel.h>
73#include <linux/module.h>
74#include <linux/moduleparam.h>
75#include <linux/netdevice.h>
76#include <linux/proc_fs.h>
77#include <linux/sched.h>
78#include <linux/signal.h>
79#include <linux/slab.h>
80#include <linux/stat.h>
81#include <linux/timer.h>
82#include <linux/wait.h>
83#include <linux/kthread.h>
84#include <linux/ratelimit.h>
85
86#ifdef VERBOSE_DEBUG
87static int usbatm_print_packet(const unsigned char *data, int len);
88#define PACKETDEBUG(arg...) usbatm_print_packet(arg)
89#define vdbg(arg...) dbg(arg)
90#else
91#define PACKETDEBUG(arg...)
92#define vdbg(arg...)
93#endif
94
95#define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
96#define DRIVER_VERSION "1.10"
97#define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION
98
99static const char usbatm_driver_name[] = "usbatm";
100
101#define UDSL_MAX_RCV_URBS 16
102#define UDSL_MAX_SND_URBS 16
103#define UDSL_MAX_BUF_SIZE 65536
104#define UDSL_DEFAULT_RCV_URBS 4
105#define UDSL_DEFAULT_SND_URBS 4
106#define UDSL_DEFAULT_RCV_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
107#define UDSL_DEFAULT_SND_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
108
109#define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
110
111#define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */
112
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_bytes = UDSL_DEFAULT_RCV_BUF_SIZE;
116static unsigned int snd_buf_bytes = 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_bytes, uint, S_IRUGO);
131MODULE_PARM_DESC(rcv_buf_bytes,
132 "Size of the buffers used for reception, in bytes (range: 1-"
133 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
134 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
135
136module_param(snd_buf_bytes, uint, S_IRUGO);
137MODULE_PARM_DESC(snd_buf_bytes,
138 "Size of the buffers used for transmission, in bytes (range: 1-"
139 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
140 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
141
142
143/* receive */
144
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
170static void usbatm_atm_dev_close(struct atm_dev *atm_dev);
171static int usbatm_atm_open(struct atm_vcc *vcc);
172static void usbatm_atm_close(struct atm_vcc *vcc);
173static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg);
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
203 dev_kfree_skb_any(skb);
204}
205
206
207/***********
208** urbs **
209************/
210
211static struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
212{
213 struct urb *urb;
214
215 spin_lock_irq(&channel->lock);
216 if (list_empty(&channel->list)) {
217 spin_unlock_irq(&channel->lock);
218 return NULL;
219 }
220
221 urb = list_entry(channel->list.next, struct urb, urb_list);
222 list_del(&urb->urb_list);
223 spin_unlock_irq(&channel->lock);
224
225 return urb;
226}
227
228static int usbatm_submit_urb(struct urb *urb)
229{
230 struct usbatm_channel *channel = urb->context;
231 int ret;
232
233 vdbg("%s: submitting urb 0x%p, size %u",
234 __func__, urb, urb->transfer_buffer_length);
235
236 ret = usb_submit_urb(urb, GFP_ATOMIC);
237 if (ret) {
238 if (printk_ratelimit())
239 atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
240 __func__, urb, ret);
241
242 /* consider all errors transient and return the buffer back to the queue */
243 urb->status = -EAGAIN;
244 spin_lock_irq(&channel->lock);
245
246 /* must add to the front when sending; doesn't matter when receiving */
247 list_add(&urb->urb_list, &channel->list);
248
249 spin_unlock_irq(&channel->lock);
250
251 /* make sure the channel doesn't stall */
252 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
253 }
254
255 return ret;
256}
257
258static void usbatm_complete(struct urb *urb)
259{
260 struct usbatm_channel *channel = urb->context;
261 unsigned long flags;
262 int status = urb->status;
263
264 vdbg("%s: urb 0x%p, status %d, actual_length %d",
265 __func__, urb, status, urb->actual_length);
266
267 /* usually in_interrupt(), but not always */
268 spin_lock_irqsave(&channel->lock, flags);
269
270 /* must add to the back when receiving; doesn't matter when sending */
271 list_add_tail(&urb->urb_list, &channel->list);
272
273 spin_unlock_irqrestore(&channel->lock, flags);
274
275 if (unlikely(status) &&
276 (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) ||
277 status != -EILSEQ)) {
278 if (status == -ESHUTDOWN)
279 return;
280
281 if (printk_ratelimit())
282 atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n",
283 __func__, urb, status);
284 /* throttle processing in case of an error */
285 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
286 } else
287 tasklet_schedule(&channel->tasklet);
288}
289
290
291/*************
292** decode **
293*************/
294
295static 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
306static 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
421static 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
468static 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 } else
520 ctrl->crc = crc32_be(ctrl->crc, ptr, left);
521 }
522
523 return bytes_written;
524}
525
526
527/**************
528** receive **
529**************/
530
531static void usbatm_rx_process(unsigned long data)
532{
533 struct usbatm_data *instance = (struct usbatm_data *)data;
534 struct urb *urb;
535
536 while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
537 vdbg("%s: processing urb 0x%p", __func__, urb);
538
539 if (usb_pipeisoc(urb->pipe)) {
540 unsigned char *merge_start = NULL;
541 unsigned int merge_length = 0;
542 const unsigned int packet_size = instance->rx_channel.packet_size;
543 int i;
544
545 for (i = 0; i < urb->number_of_packets; i++) {
546 if (!urb->iso_frame_desc[i].status) {
547 unsigned int actual_length = urb->iso_frame_desc[i].actual_length;
548
549 UDSL_ASSERT(instance, actual_length <= packet_size);
550
551 if (!merge_length)
552 merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
553 merge_length += actual_length;
554 if (merge_length && (actual_length < packet_size)) {
555 usbatm_extract_cells(instance, merge_start, merge_length);
556 merge_length = 0;
557 }
558 } else {
559 atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i);
560 if (merge_length)
561 usbatm_extract_cells(instance, merge_start, merge_length);
562 merge_length = 0;
563 instance->buf_usage = 0;
564 }
565 }
566
567 if (merge_length)
568 usbatm_extract_cells(instance, merge_start, merge_length);
569 } else
570 if (!urb->status)
571 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
572 else
573 instance->buf_usage = 0;
574
575 if (usbatm_submit_urb(urb))
576 return;
577 }
578}
579
580
581/***********
582** send **
583***********/
584
585static void usbatm_tx_process(unsigned long data)
586{
587 struct usbatm_data *instance = (struct usbatm_data *)data;
588 struct sk_buff *skb = instance->current_skb;
589 struct urb *urb = NULL;
590 const unsigned int buf_size = instance->tx_channel.buf_size;
591 unsigned int bytes_written = 0;
592 u8 *buffer = NULL;
593
594 if (!skb)
595 skb = skb_dequeue(&instance->sndqueue);
596
597 while (skb) {
598 if (!urb) {
599 urb = usbatm_pop_urb(&instance->tx_channel);
600 if (!urb)
601 break; /* no more senders */
602 buffer = urb->transfer_buffer;
603 bytes_written = (urb->status == -EAGAIN) ?
604 urb->transfer_buffer_length : 0;
605 }
606
607 bytes_written += usbatm_write_cells(instance, skb,
608 buffer + bytes_written,
609 buf_size - bytes_written);
610
611 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p",
612 __func__, bytes_written, skb, urb);
613
614 if (!UDSL_SKB(skb)->len) {
615 struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
616
617 usbatm_pop(vcc, skb);
618 atomic_inc(&vcc->stats->tx);
619
620 skb = skb_dequeue(&instance->sndqueue);
621 }
622
623 if (bytes_written == buf_size || (!skb && bytes_written)) {
624 urb->transfer_buffer_length = bytes_written;
625
626 if (usbatm_submit_urb(urb))
627 break;
628 urb = NULL;
629 }
630 }
631
632 instance->current_skb = skb;
633}
634
635static void usbatm_cancel_send(struct usbatm_data *instance,
636 struct atm_vcc *vcc)
637{
638 struct sk_buff *skb, *n;
639
640 atm_dbg(instance, "%s entered\n", __func__);
641 spin_lock_irq(&instance->sndqueue.lock);
642 skb_queue_walk_safe(&instance->sndqueue, skb, n) {
643 if (UDSL_SKB(skb)->atm.vcc == vcc) {
644 atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
645 __skb_unlink(skb, &instance->sndqueue);
646 usbatm_pop(vcc, skb);
647 }
648 }
649 spin_unlock_irq(&instance->sndqueue.lock);
650
651 tasklet_disable(&instance->tx_channel.tasklet);
652 if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
653 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
654 instance->current_skb = NULL;
655 usbatm_pop(vcc, skb);
656 }
657 tasklet_enable(&instance->tx_channel.tasklet);
658 atm_dbg(instance, "%s done\n", __func__);
659}
660
661static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
662{
663 struct usbatm_data *instance = vcc->dev->dev_data;
664 struct usbatm_control *ctrl = UDSL_SKB(skb);
665 int err;
666
667 vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);
668
669 /* racy disconnection check - fine */
670 if (!instance || instance->disconnected) {
671#ifdef DEBUG
672 printk_ratelimited(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");
673#endif
674 err = -ENODEV;
675 goto fail;
676 }
677
678 if (vcc->qos.aal != ATM_AAL5) {
679 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
680 err = -EINVAL;
681 goto fail;
682 }
683
684 if (skb->len > ATM_MAX_AAL5_PDU) {
685 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
686 __func__, skb->len, ATM_MAX_AAL5_PDU);
687 err = -EINVAL;
688 goto fail;
689 }
690
691 PACKETDEBUG(skb->data, skb->len);
692
693 /* initialize the control block */
694 ctrl->atm.vcc = vcc;
695 ctrl->len = skb->len;
696 ctrl->crc = crc32_be(~0, skb->data, skb->len);
697
698 skb_queue_tail(&instance->sndqueue, skb);
699 tasklet_schedule(&instance->tx_channel.tasklet);
700
701 return 0;
702
703 fail:
704 usbatm_pop(vcc, skb);
705 return err;
706}
707
708
709/********************
710** bean counting **
711********************/
712
713static void usbatm_destroy_instance(struct kref *kref)
714{
715 struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
716
717 dbg("%s", __func__);
718
719 tasklet_kill(&instance->rx_channel.tasklet);
720 tasklet_kill(&instance->tx_channel.tasklet);
721 usb_put_dev(instance->usb_dev);
722 kfree(instance);
723}
724
725static void usbatm_get_instance(struct usbatm_data *instance)
726{
727 dbg("%s", __func__);
728
729 kref_get(&instance->refcount);
730}
731
732static void usbatm_put_instance(struct usbatm_data *instance)
733{
734 dbg("%s", __func__);
735
736 kref_put(&instance->refcount, usbatm_destroy_instance);
737}
738
739
740/**********
741** ATM **
742**********/
743
744static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
745{
746 struct usbatm_data *instance = atm_dev->dev_data;
747
748 dbg("%s", __func__);
749
750 if (!instance)
751 return;
752
753 atm_dev->dev_data = NULL; /* catch bugs */
754 usbatm_put_instance(instance); /* taken in usbatm_atm_init */
755}
756
757static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
758{
759 struct usbatm_data *instance = atm_dev->dev_data;
760 int left = *pos;
761
762 if (!instance) {
763 dbg("%s: NULL instance!", __func__);
764 return -ENODEV;
765 }
766
767 if (!left--)
768 return sprintf(page, "%s\n", instance->description);
769
770 if (!left--)
771 return sprintf(page, "MAC: %pM\n", atm_dev->esi);
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
799static 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
876fail:
877 kfree(new);
878 mutex_unlock(&instance->serialize);
879 return ret;
880}
881
882static 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
927static 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
945static int usbatm_atm_init(struct usbatm_data *instance)
946{
947 struct atm_dev *atm_dev;
948 int ret, i;
949
950 /* ATM init. The ATM initialization scheme suffers from an intrinsic race
951 * condition: callbacks we register can be executed at once, before we have
952 * initialized the struct atm_dev. To protect against this, all callbacks
953 * abort if atm_dev->dev_data is NULL. */
954 atm_dev = atm_dev_register(instance->driver_name,
955 &instance->usb_intf->dev, &usbatm_atm_devops,
956 -1, NULL);
957 if (!atm_dev) {
958 usb_err(instance, "%s: failed to register ATM device!\n", __func__);
959 return -1;
960 }
961
962 instance->atm_dev = atm_dev;
963
964 atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
965 atm_dev->ci_range.vci_bits = ATM_CI_MAX;
966 atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
967
968 /* temp init ATM device, set to 128kbit */
969 atm_dev->link_rate = 128 * 1000 / 424;
970
971 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
972 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
973 goto fail;
974 }
975
976 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */
977
978 /* ready for ATM callbacks */
979 mb();
980 atm_dev->dev_data = instance;
981
982 /* submit all rx URBs */
983 for (i = 0; i < num_rcv_urbs; i++)
984 usbatm_submit_urb(instance->urbs[i]);
985
986 return 0;
987
988 fail:
989 instance->atm_dev = NULL;
990 atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
991 return ret;
992}
993
994
995/**********
996** USB **
997**********/
998
999static int usbatm_do_heavy_init(void *arg)
1000{
1001 struct usbatm_data *instance = arg;
1002 int ret;
1003
1004 allow_signal(SIGTERM);
1005 complete(&instance->thread_started);
1006
1007 ret = instance->driver->heavy_init(instance, instance->usb_intf);
1008
1009 if (!ret)
1010 ret = usbatm_atm_init(instance);
1011
1012 mutex_lock(&instance->serialize);
1013 instance->thread = NULL;
1014 mutex_unlock(&instance->serialize);
1015
1016 complete_and_exit(&instance->thread_exited, ret);
1017}
1018
1019static int usbatm_heavy_init(struct usbatm_data *instance)
1020{
1021 struct task_struct *t;
1022
1023 t = kthread_create(usbatm_do_heavy_init, instance,
1024 instance->driver->driver_name);
1025 if (IS_ERR(t)) {
1026 usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n",
1027 __func__, PTR_ERR(t));
1028 return PTR_ERR(t);
1029 }
1030
1031 instance->thread = t;
1032 wake_up_process(t);
1033 wait_for_completion(&instance->thread_started);
1034
1035 return 0;
1036}
1037
1038static void usbatm_tasklet_schedule(unsigned long data)
1039{
1040 tasklet_schedule((struct tasklet_struct *) data);
1041}
1042
1043static void usbatm_init_channel(struct usbatm_channel *channel)
1044{
1045 spin_lock_init(&channel->lock);
1046 INIT_LIST_HEAD(&channel->list);
1047 channel->delay.function = usbatm_tasklet_schedule;
1048 channel->delay.data = (unsigned long) &channel->tasklet;
1049 init_timer(&channel->delay);
1050}
1051
1052int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
1053 struct usbatm_driver *driver)
1054{
1055 struct device *dev = &intf->dev;
1056 struct usb_device *usb_dev = interface_to_usbdev(intf);
1057 struct usbatm_data *instance;
1058 char *buf;
1059 int error = -ENOMEM;
1060 int i, length;
1061 unsigned int maxpacket, num_packets;
1062
1063 dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n",
1064 __func__, driver->driver_name,
1065 le16_to_cpu(usb_dev->descriptor.idVendor),
1066 le16_to_cpu(usb_dev->descriptor.idProduct),
1067 intf->altsetting->desc.bInterfaceNumber);
1068
1069 /* instance init */
1070 instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
1071 if (!instance) {
1072 dev_err(dev, "%s: no memory for instance data!\n", __func__);
1073 return -ENOMEM;
1074 }
1075
1076 /* public fields */
1077
1078 instance->driver = driver;
1079 snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name);
1080
1081 instance->usb_dev = usb_dev;
1082 instance->usb_intf = intf;
1083
1084 buf = instance->description;
1085 length = sizeof(instance->description);
1086
1087 if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
1088 goto bind;
1089
1090 buf += i;
1091 length -= i;
1092
1093 i = scnprintf(buf, length, " (");
1094 buf += i;
1095 length -= i;
1096
1097 if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
1098 goto bind;
1099
1100 buf += i;
1101 length -= i;
1102
1103 snprintf(buf, length, ")");
1104
1105 bind:
1106 if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) {
1107 dev_err(dev, "%s: bind failed: %d!\n", __func__, error);
1108 goto fail_free;
1109 }
1110
1111 /* private fields */
1112
1113 kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */
1114 mutex_init(&instance->serialize);
1115
1116 instance->thread = NULL;
1117 init_completion(&instance->thread_started);
1118 init_completion(&instance->thread_exited);
1119
1120 INIT_LIST_HEAD(&instance->vcc_list);
1121 skb_queue_head_init(&instance->sndqueue);
1122
1123 usbatm_init_channel(&instance->rx_channel);
1124 usbatm_init_channel(&instance->tx_channel);
1125 tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
1126 tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
1127 instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
1128 instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
1129 instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
1130
1131 if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in)
1132 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in);
1133 else
1134 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in);
1135
1136 instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out);
1137
1138 /* tx buffer size must be a positive multiple of the stride */
1139 instance->tx_channel.buf_size = max(instance->tx_channel.stride,
1140 snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride));
1141
1142 /* rx buffer size must be a positive multiple of the endpoint maxpacket */
1143 maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0);
1144
1145 if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) {
1146 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__,
1147 usb_pipeendpoint(instance->rx_channel.endpoint));
1148 error = -EINVAL;
1149 goto fail_unbind;
1150 }
1151
1152 num_packets = max(1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */
1153
1154 if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE)
1155 num_packets--;
1156
1157 instance->rx_channel.buf_size = num_packets * maxpacket;
1158 instance->rx_channel.packet_size = maxpacket;
1159
1160#ifdef DEBUG
1161 for (i = 0; i < 2; i++) {
1162 struct usbatm_channel *channel = i ?
1163 &instance->tx_channel : &instance->rx_channel;
1164
1165 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel);
1166 }
1167#endif
1168
1169 /* initialize urbs */
1170
1171 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1172 u8 *buffer;
1173 struct usbatm_channel *channel = i < num_rcv_urbs ?
1174 &instance->rx_channel : &instance->tx_channel;
1175 struct urb *urb;
1176 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0;
1177
1178 UDSL_ASSERT(instance, !usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint));
1179
1180 urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
1181 if (!urb) {
1182 dev_err(dev, "%s: no memory for urb %d!\n", __func__, i);
1183 error = -ENOMEM;
1184 goto fail_unbind;
1185 }
1186
1187 instance->urbs[i] = urb;
1188
1189 /* zero the tx padding to avoid leaking information */
1190 buffer = kzalloc(channel->buf_size, GFP_KERNEL);
1191 if (!buffer) {
1192 dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i);
1193 error = -ENOMEM;
1194 goto fail_unbind;
1195 }
1196
1197 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
1198 buffer, channel->buf_size, usbatm_complete, channel);
1199 if (iso_packets) {
1200 int j;
1201 urb->interval = 1;
1202 urb->transfer_flags = URB_ISO_ASAP;
1203 urb->number_of_packets = iso_packets;
1204 for (j = 0; j < iso_packets; j++) {
1205 urb->iso_frame_desc[j].offset = channel->packet_size * j;
1206 urb->iso_frame_desc[j].length = channel->packet_size;
1207 }
1208 }
1209
1210 /* put all tx URBs on the list of spares */
1211 if (i >= num_rcv_urbs)
1212 list_add_tail(&urb->urb_list, &channel->list);
1213
1214 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p",
1215 __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
1216 }
1217
1218 instance->cached_vpi = ATM_VPI_UNSPEC;
1219 instance->cached_vci = ATM_VCI_UNSPEC;
1220 instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL);
1221
1222 if (!instance->cell_buf) {
1223 dev_err(dev, "%s: no memory for cell buffer!\n", __func__);
1224 error = -ENOMEM;
1225 goto fail_unbind;
1226 }
1227
1228 if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) {
1229 error = usbatm_heavy_init(instance);
1230 } else {
1231 complete(&instance->thread_exited); /* pretend that heavy_init was run */
1232 error = usbatm_atm_init(instance);
1233 }
1234
1235 if (error < 0)
1236 goto fail_unbind;
1237
1238 usb_get_dev(usb_dev);
1239 usb_set_intfdata(intf, instance);
1240
1241 return 0;
1242
1243 fail_unbind:
1244 if (instance->driver->unbind)
1245 instance->driver->unbind(instance, intf);
1246 fail_free:
1247 kfree(instance->cell_buf);
1248
1249 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1250 if (instance->urbs[i])
1251 kfree(instance->urbs[i]->transfer_buffer);
1252 usb_free_urb(instance->urbs[i]);
1253 }
1254
1255 kfree(instance);
1256
1257 return error;
1258}
1259EXPORT_SYMBOL_GPL(usbatm_usb_probe);
1260
1261void usbatm_usb_disconnect(struct usb_interface *intf)
1262{
1263 struct device *dev = &intf->dev;
1264 struct usbatm_data *instance = usb_get_intfdata(intf);
1265 struct usbatm_vcc_data *vcc_data;
1266 int i;
1267
1268 dev_dbg(dev, "%s entered\n", __func__);
1269
1270 if (!instance) {
1271 dev_dbg(dev, "%s: NULL instance!\n", __func__);
1272 return;
1273 }
1274
1275 usb_set_intfdata(intf, NULL);
1276
1277 mutex_lock(&instance->serialize);
1278 instance->disconnected = 1;
1279 if (instance->thread != NULL)
1280 send_sig(SIGTERM, instance->thread, 1);
1281 mutex_unlock(&instance->serialize);
1282
1283 wait_for_completion(&instance->thread_exited);
1284
1285 mutex_lock(&instance->serialize);
1286 list_for_each_entry(vcc_data, &instance->vcc_list, list)
1287 vcc_release_async(vcc_data->vcc, -EPIPE);
1288 mutex_unlock(&instance->serialize);
1289
1290 tasklet_disable(&instance->rx_channel.tasklet);
1291 tasklet_disable(&instance->tx_channel.tasklet);
1292
1293 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
1294 usb_kill_urb(instance->urbs[i]);
1295
1296 del_timer_sync(&instance->rx_channel.delay);
1297 del_timer_sync(&instance->tx_channel.delay);
1298
1299 /* turn usbatm_[rt]x_process into something close to a no-op */
1300 /* no need to take the spinlock */
1301 INIT_LIST_HEAD(&instance->rx_channel.list);
1302 INIT_LIST_HEAD(&instance->tx_channel.list);
1303
1304 tasklet_enable(&instance->rx_channel.tasklet);
1305 tasklet_enable(&instance->tx_channel.tasklet);
1306
1307 if (instance->atm_dev && instance->driver->atm_stop)
1308 instance->driver->atm_stop(instance, instance->atm_dev);
1309
1310 if (instance->driver->unbind)
1311 instance->driver->unbind(instance, intf);
1312
1313 instance->driver_data = NULL;
1314
1315 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1316 kfree(instance->urbs[i]->transfer_buffer);
1317 usb_free_urb(instance->urbs[i]);
1318 }
1319
1320 kfree(instance->cell_buf);
1321
1322 /* ATM finalize */
1323 if (instance->atm_dev) {
1324 atm_dev_deregister(instance->atm_dev);
1325 instance->atm_dev = NULL;
1326 }
1327
1328 usbatm_put_instance(instance); /* taken in usbatm_usb_probe */
1329}
1330EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
1331
1332
1333/***********
1334** init **
1335***********/
1336
1337static int __init usbatm_usb_init(void)
1338{
1339 dbg("%s: driver version %s", __func__, DRIVER_VERSION);
1340
1341 if (sizeof(struct usbatm_control) > FIELD_SIZEOF(struct sk_buff, cb)) {
1342 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
1343 return -EIO;
1344 }
1345
1346 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1347 || (num_snd_urbs > UDSL_MAX_SND_URBS)
1348 || (rcv_buf_bytes < 1)
1349 || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE)
1350 || (snd_buf_bytes < 1)
1351 || (snd_buf_bytes > UDSL_MAX_BUF_SIZE))
1352 return -EINVAL;
1353
1354 return 0;
1355}
1356module_init(usbatm_usb_init);
1357
1358static void __exit usbatm_usb_exit(void)
1359{
1360 dbg("%s", __func__);
1361}
1362module_exit(usbatm_usb_exit);
1363
1364MODULE_AUTHOR(DRIVER_AUTHOR);
1365MODULE_DESCRIPTION(DRIVER_DESC);
1366MODULE_LICENSE("GPL");
1367MODULE_VERSION(DRIVER_VERSION);
1368
1369/************
1370** debug **
1371************/
1372
1373#ifdef VERBOSE_DEBUG
1374static int usbatm_print_packet(const unsigned char *data, int len)
1375{
1376 unsigned char buffer[256];
1377 int i = 0, j = 0;
1378
1379 for (i = 0; i < len;) {
1380 buffer[0] = '\0';
1381 sprintf(buffer, "%.3d :", i);
1382 for (j = 0; (j < 16) && (i < len); j++, i++)
1383 sprintf(buffer, "%s %2.2x", buffer, data[i]);
1384 dbg("%s", buffer);
1385 }
1386 return i;
1387}
1388#endif
1// SPDX-License-Identifier: GPL-2.0+
2/******************************************************************************
3 * usbatm.c - Generic USB xDSL driver core
4 *
5 * Copyright (C) 2001, Alcatel
6 * Copyright (C) 2003, Duncan Sands, SolNegro, Josep Comas
7 * Copyright (C) 2004, David Woodhouse, Roman Kagan
8 ******************************************************************************/
9
10/*
11 * Written by Johan Verrept, Duncan Sands (duncan.sands@free.fr) and David Woodhouse
12 *
13 * 1.7+: - See the check-in logs
14 *
15 * 1.6: - No longer opens a connection if the firmware is not loaded
16 * - Added support for the speedtouch 330
17 * - Removed the limit on the number of devices
18 * - Module now autoloads on device plugin
19 * - Merged relevant parts of sarlib
20 * - Replaced the kernel thread with a tasklet
21 * - New packet transmission code
22 * - Changed proc file contents
23 * - Fixed all known SMP races
24 * - Many fixes and cleanups
25 * - Various fixes by Oliver Neukum (oliver@neukum.name)
26 *
27 * 1.5A: - Version for inclusion in 2.5 series kernel
28 * - Modifications by Richard Purdie (rpurdie@rpsys.net)
29 * - made compatible with kernel 2.5.6 onwards by changing
30 * usbatm_usb_send_data_context->urb to a pointer and adding code
31 * to alloc and free it
32 * - remove_wait_queue() added to usbatm_atm_processqueue_thread()
33 *
34 * 1.5: - fixed memory leak when atmsar_decode_aal5 returned NULL.
35 * (reported by stephen.robinson@zen.co.uk)
36 *
37 * 1.4: - changed the spin_lock() under interrupt to spin_lock_irqsave()
38 * - unlink all active send urbs of a vcc that is being closed.
39 *
40 * 1.3.1: - added the version number
41 *
42 * 1.3: - Added multiple send urb support
43 * - fixed memory leak and vcc->tx_inuse starvation bug
44 * when not enough memory left in vcc.
45 *
46 * 1.2: - Fixed race condition in usbatm_usb_send_data()
47 * 1.1: - Turned off packet debugging
48 *
49 */
50
51#include "usbatm.h"
52
53#include <linux/uaccess.h>
54#include <linux/crc32.h>
55#include <linux/errno.h>
56#include <linux/init.h>
57#include <linux/interrupt.h>
58#include <linux/kernel.h>
59#include <linux/module.h>
60#include <linux/moduleparam.h>
61#include <linux/netdevice.h>
62#include <linux/proc_fs.h>
63#include <linux/sched/signal.h>
64#include <linux/signal.h>
65#include <linux/slab.h>
66#include <linux/stat.h>
67#include <linux/timer.h>
68#include <linux/wait.h>
69#include <linux/kthread.h>
70#include <linux/ratelimit.h>
71
72#ifdef VERBOSE_DEBUG
73static int usbatm_print_packet(struct usbatm_data *instance, const unsigned char *data, int len);
74#define PACKETDEBUG(arg...) usbatm_print_packet(arg)
75#define vdbg(arg...) dev_dbg(arg)
76#else
77#define PACKETDEBUG(arg...)
78#define vdbg(arg...)
79#endif
80
81#define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
82#define DRIVER_DESC "Generic USB ATM/DSL I/O"
83
84static const char usbatm_driver_name[] = "usbatm";
85
86#define UDSL_MAX_RCV_URBS 16
87#define UDSL_MAX_SND_URBS 16
88#define UDSL_MAX_BUF_SIZE 65536
89#define UDSL_DEFAULT_RCV_URBS 4
90#define UDSL_DEFAULT_SND_URBS 4
91#define UDSL_DEFAULT_RCV_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
92#define UDSL_DEFAULT_SND_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
93
94#define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
95
96#define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */
97
98static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
99static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
100static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE;
101static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE;
102
103module_param(num_rcv_urbs, uint, S_IRUGO);
104MODULE_PARM_DESC(num_rcv_urbs,
105 "Number of urbs used for reception (range: 0-"
106 __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
107 __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
108
109module_param(num_snd_urbs, uint, S_IRUGO);
110MODULE_PARM_DESC(num_snd_urbs,
111 "Number of urbs used for transmission (range: 0-"
112 __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
113 __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
114
115module_param(rcv_buf_bytes, uint, S_IRUGO);
116MODULE_PARM_DESC(rcv_buf_bytes,
117 "Size of the buffers used for reception, in bytes (range: 1-"
118 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
119 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
120
121module_param(snd_buf_bytes, uint, S_IRUGO);
122MODULE_PARM_DESC(snd_buf_bytes,
123 "Size of the buffers used for transmission, in bytes (range: 1-"
124 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
125 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
126
127
128/* receive */
129
130struct usbatm_vcc_data {
131 /* vpi/vci lookup */
132 struct list_head list;
133 short vpi;
134 int vci;
135 struct atm_vcc *vcc;
136
137 /* raw cell reassembly */
138 struct sk_buff *sarb;
139};
140
141
142/* send */
143
144struct usbatm_control {
145 struct atm_skb_data atm;
146 u32 len;
147 u32 crc;
148};
149
150#define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb)
151
152
153/* ATM */
154
155static void usbatm_atm_dev_close(struct atm_dev *atm_dev);
156static int usbatm_atm_open(struct atm_vcc *vcc);
157static void usbatm_atm_close(struct atm_vcc *vcc);
158static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user *arg);
159static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
160static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t *pos, char *page);
161
162static const struct atmdev_ops usbatm_atm_devops = {
163 .dev_close = usbatm_atm_dev_close,
164 .open = usbatm_atm_open,
165 .close = usbatm_atm_close,
166 .ioctl = usbatm_atm_ioctl,
167 .send = usbatm_atm_send,
168 .proc_read = usbatm_atm_proc_read,
169 .owner = THIS_MODULE,
170};
171
172
173/***********
174** misc **
175***********/
176
177static inline unsigned int usbatm_pdu_length(unsigned int length)
178{
179 length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER;
180 return length - length % ATM_CELL_PAYLOAD;
181}
182
183static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
184{
185 if (vcc->pop)
186 vcc->pop(vcc, skb);
187 else
188 dev_kfree_skb_any(skb);
189}
190
191
192/***********
193** urbs **
194************/
195
196static struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
197{
198 struct urb *urb;
199
200 spin_lock_irq(&channel->lock);
201 if (list_empty(&channel->list)) {
202 spin_unlock_irq(&channel->lock);
203 return NULL;
204 }
205
206 urb = list_entry(channel->list.next, struct urb, urb_list);
207 list_del(&urb->urb_list);
208 spin_unlock_irq(&channel->lock);
209
210 return urb;
211}
212
213static int usbatm_submit_urb(struct urb *urb)
214{
215 struct usbatm_channel *channel = urb->context;
216 int ret;
217
218 /* vdbg("%s: submitting urb 0x%p, size %u",
219 __func__, urb, urb->transfer_buffer_length); */
220
221 ret = usb_submit_urb(urb, GFP_ATOMIC);
222 if (ret) {
223 if (printk_ratelimit())
224 atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
225 __func__, urb, ret);
226
227 /* consider all errors transient and return the buffer back to the queue */
228 urb->status = -EAGAIN;
229 spin_lock_irq(&channel->lock);
230
231 /* must add to the front when sending; doesn't matter when receiving */
232 list_add(&urb->urb_list, &channel->list);
233
234 spin_unlock_irq(&channel->lock);
235
236 /* make sure the channel doesn't stall */
237 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
238 }
239
240 return ret;
241}
242
243static void usbatm_complete(struct urb *urb)
244{
245 struct usbatm_channel *channel = urb->context;
246 unsigned long flags;
247 int status = urb->status;
248
249 /* vdbg("%s: urb 0x%p, status %d, actual_length %d",
250 __func__, urb, status, urb->actual_length); */
251
252 /* Can be invoked from task context, protect against interrupts */
253 spin_lock_irqsave(&channel->lock, flags);
254
255 /* must add to the back when receiving; doesn't matter when sending */
256 list_add_tail(&urb->urb_list, &channel->list);
257
258 spin_unlock_irqrestore(&channel->lock, flags);
259
260 if (unlikely(status) &&
261 (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) ||
262 status != -EILSEQ)) {
263 if (status == -ESHUTDOWN)
264 return;
265
266 if (printk_ratelimit())
267 atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n",
268 __func__, urb, status);
269 /* throttle processing in case of an error */
270 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
271 } else
272 tasklet_schedule(&channel->tasklet);
273}
274
275
276/*************
277** decode **
278*************/
279
280static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
281 short vpi, int vci)
282{
283 struct usbatm_vcc_data *vcc_data;
284
285 list_for_each_entry(vcc_data, &instance->vcc_list, list)
286 if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi))
287 return vcc_data;
288 return NULL;
289}
290
291static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source)
292{
293 struct atm_vcc *vcc;
294 struct sk_buff *sarb;
295 short vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4);
296 int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
297 u8 pti = ((source[3] & 0xe) >> 1);
298
299 if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) {
300 instance->cached_vpi = vpi;
301 instance->cached_vci = vci;
302
303 instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci);
304
305 if (!instance->cached_vcc)
306 atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
307 }
308
309 if (!instance->cached_vcc)
310 return;
311
312 vcc = instance->cached_vcc->vcc;
313
314 /* OAM F5 end-to-end */
315 if (pti == ATM_PTI_E2EF5) {
316 if (printk_ratelimit())
317 atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
318 __func__, vpi, vci);
319 atomic_inc(&vcc->stats->rx_err);
320 return;
321 }
322
323 sarb = instance->cached_vcc->sarb;
324
325 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
326 atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
327 __func__, sarb->len, vcc);
328 /* discard cells already received */
329 skb_trim(sarb, 0);
330 }
331
332 memcpy(skb_tail_pointer(sarb), source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
333 __skb_put(sarb, ATM_CELL_PAYLOAD);
334
335 if (pti & 1) {
336 struct sk_buff *skb;
337 unsigned int length;
338 unsigned int pdu_length;
339
340 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
341
342 /* guard against overflow */
343 if (length > ATM_MAX_AAL5_PDU) {
344 atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
345 __func__, length, vcc);
346 atomic_inc(&vcc->stats->rx_err);
347 goto out;
348 }
349
350 pdu_length = usbatm_pdu_length(length);
351
352 if (sarb->len < pdu_length) {
353 atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
354 __func__, pdu_length, sarb->len, vcc);
355 atomic_inc(&vcc->stats->rx_err);
356 goto out;
357 }
358
359 if (crc32_be(~0, skb_tail_pointer(sarb) - pdu_length, pdu_length) != 0xc704dd7b) {
360 atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
361 __func__, vcc);
362 atomic_inc(&vcc->stats->rx_err);
363 goto out;
364 }
365
366 vdbg(&instance->usb_intf->dev,
367 "%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)",
368 __func__, length, pdu_length, vcc);
369
370 skb = dev_alloc_skb(length);
371 if (!skb) {
372 if (printk_ratelimit())
373 atm_err(instance, "%s: no memory for skb (length: %u)!\n",
374 __func__, length);
375 atomic_inc(&vcc->stats->rx_drop);
376 goto out;
377 }
378
379 vdbg(&instance->usb_intf->dev,
380 "%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)",
381 __func__, skb, skb->truesize);
382
383 if (!atm_charge(vcc, skb->truesize)) {
384 atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
385 __func__, skb->truesize);
386 dev_kfree_skb_any(skb);
387 goto out; /* atm_charge increments rx_drop */
388 }
389
390 skb_copy_to_linear_data(skb,
391 skb_tail_pointer(sarb) - pdu_length,
392 length);
393 __skb_put(skb, length);
394
395 vdbg(&instance->usb_intf->dev,
396 "%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
397 __func__, skb, skb->len, skb->truesize);
398
399 PACKETDEBUG(instance, skb->data, skb->len);
400
401 vcc->push(vcc, skb);
402
403 atomic_inc(&vcc->stats->rx);
404 out:
405 skb_trim(sarb, 0);
406 }
407}
408
409static void usbatm_extract_cells(struct usbatm_data *instance,
410 unsigned char *source, unsigned int avail_data)
411{
412 unsigned int stride = instance->rx_channel.stride;
413 unsigned int buf_usage = instance->buf_usage;
414
415 /* extract cells from incoming data, taking into account that
416 * the length of avail data may not be a multiple of stride */
417
418 if (buf_usage > 0) {
419 /* we have a partially received atm cell */
420 unsigned char *cell_buf = instance->cell_buf;
421 unsigned int space_left = stride - buf_usage;
422
423 if (avail_data >= space_left) {
424 /* add new data and process cell */
425 memcpy(cell_buf + buf_usage, source, space_left);
426 source += space_left;
427 avail_data -= space_left;
428 usbatm_extract_one_cell(instance, cell_buf);
429 instance->buf_usage = 0;
430 } else {
431 /* not enough data to fill the cell */
432 memcpy(cell_buf + buf_usage, source, avail_data);
433 instance->buf_usage = buf_usage + avail_data;
434 return;
435 }
436 }
437
438 for (; avail_data >= stride; avail_data -= stride, source += stride)
439 usbatm_extract_one_cell(instance, source);
440
441 if (avail_data > 0) {
442 /* length was not a multiple of stride -
443 * save remaining data for next call */
444 memcpy(instance->cell_buf, source, avail_data);
445 instance->buf_usage = avail_data;
446 }
447}
448
449
450/*************
451** encode **
452*************/
453
454static unsigned int usbatm_write_cells(struct usbatm_data *instance,
455 struct sk_buff *skb,
456 u8 *target, unsigned int avail_space)
457{
458 struct usbatm_control *ctrl = UDSL_SKB(skb);
459 struct atm_vcc *vcc = ctrl->atm.vcc;
460 unsigned int bytes_written;
461 unsigned int stride = instance->tx_channel.stride;
462
463 for (bytes_written = 0; bytes_written < avail_space && ctrl->len;
464 bytes_written += stride, target += stride) {
465 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
466 unsigned int left = ATM_CELL_PAYLOAD - data_len;
467 u8 *ptr = target;
468
469 ptr[0] = vcc->vpi >> 4;
470 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
471 ptr[2] = vcc->vci >> 4;
472 ptr[3] = vcc->vci << 4;
473 ptr[4] = 0xec;
474 ptr += ATM_CELL_HEADER;
475
476 skb_copy_from_linear_data(skb, ptr, data_len);
477 ptr += data_len;
478 __skb_pull(skb, data_len);
479
480 if (!left)
481 continue;
482
483 memset(ptr, 0, left);
484
485 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
486 u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
487 /* trailer[0] = 0; UU = 0 */
488 /* trailer[1] = 0; CPI = 0 */
489 trailer[2] = ctrl->len >> 8;
490 trailer[3] = ctrl->len;
491
492 ctrl->crc = ~crc32_be(ctrl->crc, ptr, left - 4);
493
494 trailer[4] = ctrl->crc >> 24;
495 trailer[5] = ctrl->crc >> 16;
496 trailer[6] = ctrl->crc >> 8;
497 trailer[7] = ctrl->crc;
498
499 target[3] |= 0x2; /* adjust PTI */
500
501 ctrl->len = 0; /* tag this skb finished */
502 } else
503 ctrl->crc = crc32_be(ctrl->crc, ptr, left);
504 }
505
506 return bytes_written;
507}
508
509
510/**************
511** receive **
512**************/
513
514static void usbatm_rx_process(struct tasklet_struct *t)
515{
516 struct usbatm_data *instance = from_tasklet(instance, t,
517 rx_channel.tasklet);
518 struct urb *urb;
519
520 while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
521 vdbg(&instance->usb_intf->dev,
522 "%s: processing urb 0x%p", __func__, urb);
523
524 if (usb_pipeisoc(urb->pipe)) {
525 unsigned char *merge_start = NULL;
526 unsigned int merge_length = 0;
527 const unsigned int packet_size = instance->rx_channel.packet_size;
528 int i;
529
530 for (i = 0; i < urb->number_of_packets; i++) {
531 if (!urb->iso_frame_desc[i].status) {
532 unsigned int actual_length = urb->iso_frame_desc[i].actual_length;
533
534 if (!merge_length)
535 merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
536 merge_length += actual_length;
537 if (merge_length && (actual_length < packet_size)) {
538 usbatm_extract_cells(instance, merge_start, merge_length);
539 merge_length = 0;
540 }
541 } else {
542 atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i);
543 if (merge_length)
544 usbatm_extract_cells(instance, merge_start, merge_length);
545 merge_length = 0;
546 instance->buf_usage = 0;
547 }
548 }
549
550 if (merge_length)
551 usbatm_extract_cells(instance, merge_start, merge_length);
552 } else
553 if (!urb->status)
554 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
555 else
556 instance->buf_usage = 0;
557
558 if (usbatm_submit_urb(urb))
559 return;
560 }
561}
562
563
564/***********
565** send **
566***********/
567
568static void usbatm_tx_process(struct tasklet_struct *t)
569{
570 struct usbatm_data *instance = from_tasklet(instance, t,
571 tx_channel.tasklet);
572 struct sk_buff *skb = instance->current_skb;
573 struct urb *urb = NULL;
574 const unsigned int buf_size = instance->tx_channel.buf_size;
575 unsigned int bytes_written = 0;
576 u8 *buffer = NULL;
577
578 if (!skb)
579 skb = skb_dequeue(&instance->sndqueue);
580
581 while (skb) {
582 if (!urb) {
583 urb = usbatm_pop_urb(&instance->tx_channel);
584 if (!urb)
585 break; /* no more senders */
586 buffer = urb->transfer_buffer;
587 bytes_written = (urb->status == -EAGAIN) ?
588 urb->transfer_buffer_length : 0;
589 }
590
591 bytes_written += usbatm_write_cells(instance, skb,
592 buffer + bytes_written,
593 buf_size - bytes_written);
594
595 vdbg(&instance->usb_intf->dev,
596 "%s: wrote %u bytes from skb 0x%p to urb 0x%p",
597 __func__, bytes_written, skb, urb);
598
599 if (!UDSL_SKB(skb)->len) {
600 struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
601
602 usbatm_pop(vcc, skb);
603 atomic_inc(&vcc->stats->tx);
604
605 skb = skb_dequeue(&instance->sndqueue);
606 }
607
608 if (bytes_written == buf_size || (!skb && bytes_written)) {
609 urb->transfer_buffer_length = bytes_written;
610
611 if (usbatm_submit_urb(urb))
612 break;
613 urb = NULL;
614 }
615 }
616
617 instance->current_skb = skb;
618}
619
620static void usbatm_cancel_send(struct usbatm_data *instance,
621 struct atm_vcc *vcc)
622{
623 struct sk_buff *skb, *n;
624
625 spin_lock_irq(&instance->sndqueue.lock);
626 skb_queue_walk_safe(&instance->sndqueue, skb, n) {
627 if (UDSL_SKB(skb)->atm.vcc == vcc) {
628 atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
629 __skb_unlink(skb, &instance->sndqueue);
630 usbatm_pop(vcc, skb);
631 }
632 }
633 spin_unlock_irq(&instance->sndqueue.lock);
634
635 tasklet_disable(&instance->tx_channel.tasklet);
636 if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
637 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
638 instance->current_skb = NULL;
639 usbatm_pop(vcc, skb);
640 }
641 tasklet_enable(&instance->tx_channel.tasklet);
642}
643
644static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
645{
646 struct usbatm_data *instance = vcc->dev->dev_data;
647 struct usbatm_control *ctrl = UDSL_SKB(skb);
648 int err;
649
650 /* racy disconnection check - fine */
651 if (!instance || instance->disconnected) {
652#ifdef VERBOSE_DEBUG
653 printk_ratelimited(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");
654#endif
655 err = -ENODEV;
656 goto fail;
657 }
658
659 if (vcc->qos.aal != ATM_AAL5) {
660 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
661 err = -EINVAL;
662 goto fail;
663 }
664
665 if (skb->len > ATM_MAX_AAL5_PDU) {
666 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
667 __func__, skb->len, ATM_MAX_AAL5_PDU);
668 err = -EINVAL;
669 goto fail;
670 }
671
672 PACKETDEBUG(instance, skb->data, skb->len);
673
674 /* initialize the control block */
675 ctrl->atm.vcc = vcc;
676 ctrl->len = skb->len;
677 ctrl->crc = crc32_be(~0, skb->data, skb->len);
678
679 skb_queue_tail(&instance->sndqueue, skb);
680 tasklet_schedule(&instance->tx_channel.tasklet);
681
682 return 0;
683
684 fail:
685 usbatm_pop(vcc, skb);
686 return err;
687}
688
689
690/********************
691** bean counting **
692********************/
693
694static void usbatm_destroy_instance(struct kref *kref)
695{
696 struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
697
698 tasklet_kill(&instance->rx_channel.tasklet);
699 tasklet_kill(&instance->tx_channel.tasklet);
700 usb_put_dev(instance->usb_dev);
701 kfree(instance);
702}
703
704static void usbatm_get_instance(struct usbatm_data *instance)
705{
706 kref_get(&instance->refcount);
707}
708
709static void usbatm_put_instance(struct usbatm_data *instance)
710{
711 kref_put(&instance->refcount, usbatm_destroy_instance);
712}
713
714
715/**********
716** ATM **
717**********/
718
719static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
720{
721 struct usbatm_data *instance = atm_dev->dev_data;
722
723 if (!instance)
724 return;
725
726 atm_dev->dev_data = NULL; /* catch bugs */
727 usbatm_put_instance(instance); /* taken in usbatm_atm_init */
728}
729
730static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t *pos, char *page)
731{
732 struct usbatm_data *instance = atm_dev->dev_data;
733 int left = *pos;
734
735 if (!instance)
736 return -ENODEV;
737
738 if (!left--)
739 return sprintf(page, "%s\n", instance->description);
740
741 if (!left--)
742 return sprintf(page, "MAC: %pM\n", atm_dev->esi);
743
744 if (!left--)
745 return sprintf(page,
746 "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
747 atomic_read(&atm_dev->stats.aal5.tx),
748 atomic_read(&atm_dev->stats.aal5.tx_err),
749 atomic_read(&atm_dev->stats.aal5.rx),
750 atomic_read(&atm_dev->stats.aal5.rx_err),
751 atomic_read(&atm_dev->stats.aal5.rx_drop));
752
753 if (!left--) {
754 if (instance->disconnected)
755 return sprintf(page, "Disconnected\n");
756 else
757 switch (atm_dev->signal) {
758 case ATM_PHY_SIG_FOUND:
759 return sprintf(page, "Line up\n");
760 case ATM_PHY_SIG_LOST:
761 return sprintf(page, "Line down\n");
762 default:
763 return sprintf(page, "Line state unknown\n");
764 }
765 }
766
767 return 0;
768}
769
770static int usbatm_atm_open(struct atm_vcc *vcc)
771{
772 struct usbatm_data *instance = vcc->dev->dev_data;
773 struct usbatm_vcc_data *new = NULL;
774 int ret;
775 int vci = vcc->vci;
776 short vpi = vcc->vpi;
777
778 if (!instance)
779 return -ENODEV;
780
781 /* only support AAL5 */
782 if ((vcc->qos.aal != ATM_AAL5)) {
783 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
784 return -EINVAL;
785 }
786
787 /* sanity checks */
788 if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
789 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu);
790 return -EINVAL;
791 }
792
793 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */
794
795 if (instance->disconnected) {
796 atm_dbg(instance, "%s: disconnected!\n", __func__);
797 ret = -ENODEV;
798 goto fail;
799 }
800
801 if (usbatm_find_vcc(instance, vpi, vci)) {
802 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
803 ret = -EADDRINUSE;
804 goto fail;
805 }
806
807 new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL);
808 if (!new) {
809 ret = -ENOMEM;
810 goto fail;
811 }
812
813 new->vcc = vcc;
814 new->vpi = vpi;
815 new->vci = vci;
816
817 new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
818 if (!new->sarb) {
819 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__);
820 ret = -ENOMEM;
821 goto fail;
822 }
823
824 vcc->dev_data = new;
825
826 tasklet_disable(&instance->rx_channel.tasklet);
827 instance->cached_vcc = new;
828 instance->cached_vpi = vpi;
829 instance->cached_vci = vci;
830 list_add(&new->list, &instance->vcc_list);
831 tasklet_enable(&instance->rx_channel.tasklet);
832
833 set_bit(ATM_VF_ADDR, &vcc->flags);
834 set_bit(ATM_VF_PARTIAL, &vcc->flags);
835 set_bit(ATM_VF_READY, &vcc->flags);
836
837 mutex_unlock(&instance->serialize);
838
839 atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
840
841 return 0;
842
843fail:
844 kfree(new);
845 mutex_unlock(&instance->serialize);
846 return ret;
847}
848
849static void usbatm_atm_close(struct atm_vcc *vcc)
850{
851 struct usbatm_data *instance = vcc->dev->dev_data;
852 struct usbatm_vcc_data *vcc_data = vcc->dev_data;
853
854 if (!instance || !vcc_data)
855 return;
856
857 usbatm_cancel_send(instance, vcc);
858
859 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */
860
861 tasklet_disable(&instance->rx_channel.tasklet);
862 if (instance->cached_vcc == vcc_data) {
863 instance->cached_vcc = NULL;
864 instance->cached_vpi = ATM_VPI_UNSPEC;
865 instance->cached_vci = ATM_VCI_UNSPEC;
866 }
867 list_del(&vcc_data->list);
868 tasklet_enable(&instance->rx_channel.tasklet);
869
870 kfree_skb(vcc_data->sarb);
871 vcc_data->sarb = NULL;
872
873 kfree(vcc_data);
874 vcc->dev_data = NULL;
875
876 vcc->vpi = ATM_VPI_UNSPEC;
877 vcc->vci = ATM_VCI_UNSPEC;
878 clear_bit(ATM_VF_READY, &vcc->flags);
879 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
880 clear_bit(ATM_VF_ADDR, &vcc->flags);
881
882 mutex_unlock(&instance->serialize);
883}
884
885static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd,
886 void __user *arg)
887{
888 struct usbatm_data *instance = atm_dev->dev_data;
889
890 if (!instance || instance->disconnected)
891 return -ENODEV;
892
893 switch (cmd) {
894 case ATM_QUERYLOOP:
895 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
896 default:
897 return -ENOIOCTLCMD;
898 }
899}
900
901static int usbatm_atm_init(struct usbatm_data *instance)
902{
903 struct atm_dev *atm_dev;
904 int ret, i;
905
906 /* ATM init. The ATM initialization scheme suffers from an intrinsic race
907 * condition: callbacks we register can be executed at once, before we have
908 * initialized the struct atm_dev. To protect against this, all callbacks
909 * abort if atm_dev->dev_data is NULL. */
910 atm_dev = atm_dev_register(instance->driver_name,
911 &instance->usb_intf->dev, &usbatm_atm_devops,
912 -1, NULL);
913 if (!atm_dev) {
914 usb_err(instance, "%s: failed to register ATM device!\n", __func__);
915 return -1;
916 }
917
918 instance->atm_dev = atm_dev;
919
920 atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
921 atm_dev->ci_range.vci_bits = ATM_CI_MAX;
922 atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
923
924 /* temp init ATM device, set to 128kbit */
925 atm_dev->link_rate = 128 * 1000 / 424;
926
927 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
928 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
929 goto fail;
930 }
931
932 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */
933
934 /* ready for ATM callbacks */
935 mb();
936 atm_dev->dev_data = instance;
937
938 /* submit all rx URBs */
939 for (i = 0; i < num_rcv_urbs; i++)
940 usbatm_submit_urb(instance->urbs[i]);
941
942 return 0;
943
944 fail:
945 instance->atm_dev = NULL;
946 atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
947 return ret;
948}
949
950
951/**********
952** USB **
953**********/
954
955static int usbatm_do_heavy_init(void *arg)
956{
957 struct usbatm_data *instance = arg;
958 int ret;
959
960 allow_signal(SIGTERM);
961 complete(&instance->thread_started);
962
963 ret = instance->driver->heavy_init(instance, instance->usb_intf);
964
965 if (!ret)
966 ret = usbatm_atm_init(instance);
967
968 mutex_lock(&instance->serialize);
969 instance->thread = NULL;
970 mutex_unlock(&instance->serialize);
971
972 kthread_complete_and_exit(&instance->thread_exited, ret);
973}
974
975static int usbatm_heavy_init(struct usbatm_data *instance)
976{
977 struct task_struct *t;
978
979 t = kthread_create(usbatm_do_heavy_init, instance, "%s",
980 instance->driver->driver_name);
981 if (IS_ERR(t)) {
982 usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n",
983 __func__, PTR_ERR(t));
984 return PTR_ERR(t);
985 }
986
987 instance->thread = t;
988 wake_up_process(t);
989 wait_for_completion(&instance->thread_started);
990
991 return 0;
992}
993
994static void usbatm_tasklet_schedule(struct timer_list *t)
995{
996 struct usbatm_channel *channel = from_timer(channel, t, delay);
997
998 tasklet_schedule(&channel->tasklet);
999}
1000
1001static void usbatm_init_channel(struct usbatm_channel *channel)
1002{
1003 spin_lock_init(&channel->lock);
1004 INIT_LIST_HEAD(&channel->list);
1005 timer_setup(&channel->delay, usbatm_tasklet_schedule, 0);
1006}
1007
1008int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
1009 struct usbatm_driver *driver)
1010{
1011 struct device *dev = &intf->dev;
1012 struct usb_device *usb_dev = interface_to_usbdev(intf);
1013 struct usbatm_data *instance;
1014 char *buf;
1015 int error = -ENOMEM;
1016 int i, length;
1017 unsigned int maxpacket, num_packets;
1018 size_t size;
1019
1020 /* instance init */
1021 size = struct_size(instance, urbs,
1022 size_add(num_rcv_urbs, num_snd_urbs));
1023 instance = kzalloc(size, GFP_KERNEL);
1024 if (!instance)
1025 return -ENOMEM;
1026
1027 /* public fields */
1028
1029 instance->driver = driver;
1030 strscpy(instance->driver_name, driver->driver_name,
1031 sizeof(instance->driver_name));
1032
1033 instance->usb_dev = usb_dev;
1034 instance->usb_intf = intf;
1035
1036 buf = instance->description;
1037 length = sizeof(instance->description);
1038
1039 if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
1040 goto bind;
1041
1042 buf += i;
1043 length -= i;
1044
1045 i = scnprintf(buf, length, " (");
1046 buf += i;
1047 length -= i;
1048
1049 if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
1050 goto bind;
1051
1052 buf += i;
1053 length -= i;
1054
1055 snprintf(buf, length, ")");
1056
1057 bind:
1058 if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) {
1059 dev_err(dev, "%s: bind failed: %d!\n", __func__, error);
1060 goto fail_free;
1061 }
1062
1063 /* private fields */
1064
1065 kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */
1066 mutex_init(&instance->serialize);
1067
1068 instance->thread = NULL;
1069 init_completion(&instance->thread_started);
1070 init_completion(&instance->thread_exited);
1071
1072 INIT_LIST_HEAD(&instance->vcc_list);
1073 skb_queue_head_init(&instance->sndqueue);
1074
1075 usbatm_init_channel(&instance->rx_channel);
1076 usbatm_init_channel(&instance->tx_channel);
1077 tasklet_setup(&instance->rx_channel.tasklet, usbatm_rx_process);
1078 tasklet_setup(&instance->tx_channel.tasklet, usbatm_tx_process);
1079 instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
1080 instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
1081 instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
1082
1083 if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in)
1084 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in);
1085 else
1086 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in);
1087
1088 instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out);
1089
1090 /* tx buffer size must be a positive multiple of the stride */
1091 instance->tx_channel.buf_size = max(instance->tx_channel.stride,
1092 snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride));
1093
1094 /* rx buffer size must be a positive multiple of the endpoint maxpacket */
1095 maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint);
1096
1097 if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) {
1098 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__,
1099 usb_pipeendpoint(instance->rx_channel.endpoint));
1100 error = -EINVAL;
1101 goto fail_unbind;
1102 }
1103
1104 num_packets = max(1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */
1105
1106 if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE)
1107 num_packets--;
1108
1109 instance->rx_channel.buf_size = num_packets * maxpacket;
1110 instance->rx_channel.packet_size = maxpacket;
1111
1112 for (i = 0; i < 2; i++) {
1113 struct usbatm_channel *channel = i ?
1114 &instance->tx_channel : &instance->rx_channel;
1115
1116 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n",
1117 __func__, channel->buf_size, i ? "tx" : "rx", channel);
1118 }
1119
1120 /* initialize urbs */
1121
1122 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1123 u8 *buffer;
1124 struct usbatm_channel *channel = i < num_rcv_urbs ?
1125 &instance->rx_channel : &instance->tx_channel;
1126 struct urb *urb;
1127 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0;
1128
1129 urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
1130 if (!urb) {
1131 error = -ENOMEM;
1132 goto fail_unbind;
1133 }
1134
1135 instance->urbs[i] = urb;
1136
1137 /* zero the tx padding to avoid leaking information */
1138 buffer = kzalloc(channel->buf_size, GFP_KERNEL);
1139 if (!buffer) {
1140 error = -ENOMEM;
1141 goto fail_unbind;
1142 }
1143
1144 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
1145 buffer, channel->buf_size, usbatm_complete, channel);
1146 if (iso_packets) {
1147 int j;
1148 urb->interval = 1;
1149 urb->transfer_flags = URB_ISO_ASAP;
1150 urb->number_of_packets = iso_packets;
1151 for (j = 0; j < iso_packets; j++) {
1152 urb->iso_frame_desc[j].offset = channel->packet_size * j;
1153 urb->iso_frame_desc[j].length = channel->packet_size;
1154 }
1155 }
1156
1157 /* put all tx URBs on the list of spares */
1158 if (i >= num_rcv_urbs)
1159 list_add_tail(&urb->urb_list, &channel->list);
1160
1161 vdbg(&intf->dev, "%s: alloced buffer 0x%p buf size %u urb 0x%p",
1162 __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
1163 }
1164
1165 instance->cached_vpi = ATM_VPI_UNSPEC;
1166 instance->cached_vci = ATM_VCI_UNSPEC;
1167 instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL);
1168
1169 if (!instance->cell_buf) {
1170 error = -ENOMEM;
1171 goto fail_unbind;
1172 }
1173
1174 if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) {
1175 error = usbatm_heavy_init(instance);
1176 } else {
1177 complete(&instance->thread_exited); /* pretend that heavy_init was run */
1178 error = usbatm_atm_init(instance);
1179 }
1180
1181 if (error < 0)
1182 goto fail_unbind;
1183
1184 usb_get_dev(usb_dev);
1185 usb_set_intfdata(intf, instance);
1186
1187 return 0;
1188
1189 fail_unbind:
1190 if (instance->driver->unbind)
1191 instance->driver->unbind(instance, intf);
1192 fail_free:
1193 kfree(instance->cell_buf);
1194
1195 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1196 if (instance->urbs[i])
1197 kfree(instance->urbs[i]->transfer_buffer);
1198 usb_free_urb(instance->urbs[i]);
1199 }
1200
1201 kfree(instance);
1202
1203 return error;
1204}
1205EXPORT_SYMBOL_GPL(usbatm_usb_probe);
1206
1207void usbatm_usb_disconnect(struct usb_interface *intf)
1208{
1209 struct device *dev = &intf->dev;
1210 struct usbatm_data *instance = usb_get_intfdata(intf);
1211 struct usbatm_vcc_data *vcc_data;
1212 int i;
1213
1214 if (!instance) {
1215 dev_dbg(dev, "%s: NULL instance!\n", __func__);
1216 return;
1217 }
1218
1219 usb_set_intfdata(intf, NULL);
1220
1221 mutex_lock(&instance->serialize);
1222 instance->disconnected = 1;
1223 if (instance->thread != NULL)
1224 send_sig(SIGTERM, instance->thread, 1);
1225 mutex_unlock(&instance->serialize);
1226
1227 wait_for_completion(&instance->thread_exited);
1228
1229 mutex_lock(&instance->serialize);
1230 list_for_each_entry(vcc_data, &instance->vcc_list, list)
1231 vcc_release_async(vcc_data->vcc, -EPIPE);
1232 mutex_unlock(&instance->serialize);
1233
1234 tasklet_disable(&instance->rx_channel.tasklet);
1235 tasklet_disable(&instance->tx_channel.tasklet);
1236
1237 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
1238 usb_kill_urb(instance->urbs[i]);
1239
1240 del_timer_sync(&instance->rx_channel.delay);
1241 del_timer_sync(&instance->tx_channel.delay);
1242
1243 /* turn usbatm_[rt]x_process into something close to a no-op */
1244 /* no need to take the spinlock */
1245 INIT_LIST_HEAD(&instance->rx_channel.list);
1246 INIT_LIST_HEAD(&instance->tx_channel.list);
1247
1248 tasklet_enable(&instance->rx_channel.tasklet);
1249 tasklet_enable(&instance->tx_channel.tasklet);
1250
1251 if (instance->atm_dev && instance->driver->atm_stop)
1252 instance->driver->atm_stop(instance, instance->atm_dev);
1253
1254 if (instance->driver->unbind)
1255 instance->driver->unbind(instance, intf);
1256
1257 instance->driver_data = NULL;
1258
1259 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1260 kfree(instance->urbs[i]->transfer_buffer);
1261 usb_free_urb(instance->urbs[i]);
1262 }
1263
1264 kfree(instance->cell_buf);
1265
1266 /* ATM finalize */
1267 if (instance->atm_dev) {
1268 atm_dev_deregister(instance->atm_dev);
1269 instance->atm_dev = NULL;
1270 }
1271
1272 usbatm_put_instance(instance); /* taken in usbatm_usb_probe */
1273}
1274EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
1275
1276
1277/***********
1278** init **
1279***********/
1280
1281static int __init usbatm_usb_init(void)
1282{
1283 if (sizeof(struct usbatm_control) > sizeof_field(struct sk_buff, cb)) {
1284 pr_err("%s unusable with this kernel!\n", usbatm_driver_name);
1285 return -EIO;
1286 }
1287
1288 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1289 || (num_snd_urbs > UDSL_MAX_SND_URBS)
1290 || (rcv_buf_bytes < 1)
1291 || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE)
1292 || (snd_buf_bytes < 1)
1293 || (snd_buf_bytes > UDSL_MAX_BUF_SIZE))
1294 return -EINVAL;
1295
1296 return 0;
1297}
1298module_init(usbatm_usb_init);
1299
1300static void __exit usbatm_usb_exit(void)
1301{
1302}
1303module_exit(usbatm_usb_exit);
1304
1305MODULE_AUTHOR(DRIVER_AUTHOR);
1306MODULE_DESCRIPTION(DRIVER_DESC);
1307MODULE_LICENSE("GPL");
1308
1309/************
1310** debug **
1311************/
1312
1313#ifdef VERBOSE_DEBUG
1314static int usbatm_print_packet(struct usbatm_data *instance,
1315 const unsigned char *data, int len)
1316{
1317 unsigned char buffer[256];
1318 int i = 0, j = 0;
1319
1320 for (i = 0; i < len;) {
1321 buffer[0] = '\0';
1322 sprintf(buffer, "%.3d :", i);
1323 for (j = 0; (j < 16) && (i < len); j++, i++)
1324 sprintf(buffer, "%s %2.2x", buffer, data[i]);
1325 dev_dbg(&instance->usb_intf->dev, "%s", buffer);
1326 }
1327 return i;
1328}
1329#endif