[PATCH] USBATM: allow isochronous transfer
[deliverable/linux.git] / drivers / usb / atm / usbatm.c
CommitLineData
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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
6f749475 102#define UDSL_MAX_BUF_SIZE 64 * 1024 /* bytes */
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103#define UDSL_DEFAULT_RCV_URBS 4
104#define UDSL_DEFAULT_SND_URBS 4
6f749475
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105#define UDSL_DEFAULT_RCV_BUF_SIZE 64 * ATM_CELL_SIZE /* bytes */
106#define UDSL_DEFAULT_SND_BUF_SIZE 64 * ATM_CELL_SIZE /* bytes */
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107
108#define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
109
110#define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */
111
112static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
113static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
6f749475
DS
114static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE;
115static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE;
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116
117module_param(num_rcv_urbs, uint, S_IRUGO);
118MODULE_PARM_DESC(num_rcv_urbs,
119 "Number of urbs used for reception (range: 0-"
120 __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
121 __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
122
123module_param(num_snd_urbs, uint, S_IRUGO);
124MODULE_PARM_DESC(num_snd_urbs,
125 "Number of urbs used for transmission (range: 0-"
126 __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
127 __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
128
6f749475
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129module_param(rcv_buf_bytes, uint, S_IRUGO);
130MODULE_PARM_DESC(rcv_buf_bytes,
131 "Size of the buffers used for reception, in bytes (range: 1-"
132 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
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133 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
134
6f749475
DS
135module_param(snd_buf_bytes, uint, S_IRUGO);
136MODULE_PARM_DESC(snd_buf_bytes,
137 "Size of the buffers used for transmission, in bytes (range: 1-"
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138 __MODULE_STRING(UDSL_MAX_SND_BUF_SIZE) ", default: "
139 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
140
141
142/* receive */
143
144struct usbatm_vcc_data {
145 /* vpi/vci lookup */
146 struct list_head list;
147 short vpi;
148 int vci;
149 struct atm_vcc *vcc;
150
151 /* raw cell reassembly */
152 struct sk_buff *sarb;
153};
154
155
156/* send */
157
158struct usbatm_control {
159 struct atm_skb_data atm;
160 u32 len;
161 u32 crc;
162};
163
164#define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb)
165
166
167/* ATM */
168
0ec3c7e8 169static void usbatm_atm_dev_close(struct atm_dev *atm_dev);
c59bba75
DS
170static int usbatm_atm_open(struct atm_vcc *vcc);
171static void usbatm_atm_close(struct atm_vcc *vcc);
0ec3c7e8 172static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg);
c59bba75
DS
173static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
174static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
175
176static struct atmdev_ops usbatm_atm_devops = {
177 .dev_close = usbatm_atm_dev_close,
178 .open = usbatm_atm_open,
179 .close = usbatm_atm_close,
180 .ioctl = usbatm_atm_ioctl,
181 .send = usbatm_atm_send,
182 .proc_read = usbatm_atm_proc_read,
183 .owner = THIS_MODULE,
184};
185
186
187/***********
188** misc **
189***********/
190
191static inline unsigned int usbatm_pdu_length(unsigned int length)
192{
193 length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER;
194 return length - length % ATM_CELL_PAYLOAD;
195}
196
197static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
198{
199 if (vcc->pop)
200 vcc->pop(vcc, skb);
201 else
227d7761 202 dev_kfree_skb_any(skb);
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203}
204
205
206/***********
207** urbs **
208************/
209
858119e1 210static struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
c59bba75
DS
211{
212 struct urb *urb;
213
214 spin_lock_irq(&channel->lock);
215 if (list_empty(&channel->list)) {
216 spin_unlock_irq(&channel->lock);
217 return NULL;
218 }
219
220 urb = list_entry(channel->list.next, struct urb, urb_list);
221 list_del(&urb->urb_list);
222 spin_unlock_irq(&channel->lock);
223
224 return urb;
225}
226
858119e1 227static int usbatm_submit_urb(struct urb *urb)
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DS
228{
229 struct usbatm_channel *channel = urb->context;
230 int ret;
231
232 vdbg("%s: submitting urb 0x%p, size %u",
233 __func__, urb, urb->transfer_buffer_length);
234
235 ret = usb_submit_urb(urb, GFP_ATOMIC);
236 if (ret) {
0ec3c7e8
DS
237 if (printk_ratelimit())
238 atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
239 __func__, urb, ret);
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240
241 /* consider all errors transient and return the buffer back to the queue */
242 urb->status = -EAGAIN;
243 spin_lock_irq(&channel->lock);
244
245 /* must add to the front when sending; doesn't matter when receiving */
246 list_add(&urb->urb_list, &channel->list);
247
248 spin_unlock_irq(&channel->lock);
249
250 /* make sure the channel doesn't stall */
251 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
252 }
253
254 return ret;
255}
256
257static void usbatm_complete(struct urb *urb, struct pt_regs *regs)
258{
259 struct usbatm_channel *channel = urb->context;
260 unsigned long flags;
261
262 vdbg("%s: urb 0x%p, status %d, actual_length %d",
263 __func__, urb, urb->status, urb->actual_length);
264
265 /* usually in_interrupt(), but not always */
266 spin_lock_irqsave(&channel->lock, flags);
267
268 /* must add to the back when receiving; doesn't matter when sending */
269 list_add_tail(&urb->urb_list, &channel->list);
270
271 spin_unlock_irqrestore(&channel->lock, flags);
272
0ec3c7e8
DS
273 if (unlikely(urb->status)) {
274 if (printk_ratelimit())
275 atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n",
276 __func__, urb, urb->status);
c59bba75
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277 /* throttle processing in case of an error */
278 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
0ec3c7e8 279 } else
c59bba75
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280 tasklet_schedule(&channel->tasklet);
281}
282
283
284/*************
285** decode **
286*************/
287
288static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
289 short vpi, int vci)
290{
0ec3c7e8 291 struct usbatm_vcc_data *vcc_data;
c59bba75 292
0ec3c7e8
DS
293 list_for_each_entry(vcc_data, &instance->vcc_list, list)
294 if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi))
295 return vcc_data;
c59bba75
DS
296 return NULL;
297}
298
299static void usbatm_extract_cells(struct usbatm_data *instance,
300 unsigned char *source, unsigned int avail_data)
301{
302 struct usbatm_vcc_data *cached_vcc = NULL;
303 struct atm_vcc *vcc;
304 struct sk_buff *sarb;
c59bba75
DS
305 unsigned int stride = instance->rx_channel.stride;
306 int vci, cached_vci = 0;
307 short vpi, cached_vpi = 0;
308 u8 pti;
309
310 for (; avail_data >= stride; avail_data -= stride, source += stride) {
311 vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4);
312 vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
313 pti = ((source[3] & 0xe) >> 1);
314
315 vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
316
e20d6645 317 if ((vci != cached_vci) || (vpi != cached_vpi)) {
c59bba75
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318 cached_vpi = vpi;
319 cached_vci = vci;
e20d6645
DS
320
321 cached_vcc = usbatm_find_vcc(instance, vpi, vci);
322
323 if (!cached_vcc)
0ec3c7e8 324 atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
c59bba75
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325 }
326
e20d6645
DS
327 if (!cached_vcc)
328 continue;
329
330 vcc = cached_vcc->vcc;
c59bba75
DS
331
332 /* OAM F5 end-to-end */
333 if (pti == ATM_PTI_E2EF5) {
0ec3c7e8
DS
334 if (printk_ratelimit())
335 atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
336 __func__, vpi, vci);
c59bba75
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337 atomic_inc(&vcc->stats->rx_err);
338 continue;
339 }
340
e20d6645 341 sarb = cached_vcc->sarb;
c59bba75
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342
343 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
0ec3c7e8 344 atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
c59bba75
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345 __func__, sarb->len, vcc);
346 /* discard cells already received */
347 skb_trim(sarb, 0);
348 UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end);
349 }
350
351 memcpy(sarb->tail, source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
352 __skb_put(sarb, ATM_CELL_PAYLOAD);
353
354 if (pti & 1) {
355 struct sk_buff *skb;
356 unsigned int length;
357 unsigned int pdu_length;
358
359 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
360
361 /* guard against overflow */
362 if (length > ATM_MAX_AAL5_PDU) {
0ec3c7e8 363 atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
c59bba75
DS
364 __func__, length, vcc);
365 atomic_inc(&vcc->stats->rx_err);
366 goto out;
367 }
368
369 pdu_length = usbatm_pdu_length(length);
370
371 if (sarb->len < pdu_length) {
0ec3c7e8 372 atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
c59bba75
DS
373 __func__, pdu_length, sarb->len, vcc);
374 atomic_inc(&vcc->stats->rx_err);
375 goto out;
376 }
377
378 if (crc32_be(~0, sarb->tail - pdu_length, pdu_length) != 0xc704dd7b) {
0ec3c7e8 379 atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
c59bba75
DS
380 __func__, vcc);
381 atomic_inc(&vcc->stats->rx_err);
382 goto out;
383 }
384
385 vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
386
387 if (!(skb = dev_alloc_skb(length))) {
0ec3c7e8
DS
388 if (printk_ratelimit())
389 atm_err(instance, "%s: no memory for skb (length: %u)!\n",
390 __func__, length);
c59bba75
DS
391 atomic_inc(&vcc->stats->rx_drop);
392 goto out;
393 }
394
395 vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
396
397 if (!atm_charge(vcc, skb->truesize)) {
0ec3c7e8
DS
398 atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
399 __func__, skb->truesize);
227d7761 400 dev_kfree_skb_any(skb);
c59bba75
DS
401 goto out; /* atm_charge increments rx_drop */
402 }
403
404 memcpy(skb->data, sarb->tail - pdu_length, length);
405 __skb_put(skb, length);
406
407 vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
408 __func__, skb, skb->len, skb->truesize);
409
410 PACKETDEBUG(skb->data, skb->len);
411
412 vcc->push(vcc, skb);
413
414 atomic_inc(&vcc->stats->rx);
415 out:
416 skb_trim(sarb, 0);
417 }
418 }
419}
420
421
422/*************
423** encode **
424*************/
425
426static unsigned int usbatm_write_cells(struct usbatm_data *instance,
427 struct sk_buff *skb,
428 u8 *target, unsigned int avail_space)
429{
430 struct usbatm_control *ctrl = UDSL_SKB(skb);
431 struct atm_vcc *vcc = ctrl->atm.vcc;
6f749475 432 unsigned int bytes_written;
c59bba75
DS
433 unsigned int stride = instance->tx_channel.stride;
434
435 vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space);
436 UDSL_ASSERT(!(avail_space % stride));
437
6f749475
DS
438 for (bytes_written = 0; bytes_written < avail_space && ctrl->len;
439 bytes_written += stride, target += stride) {
c59bba75
DS
440 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
441 unsigned int left = ATM_CELL_PAYLOAD - data_len;
442 u8 *ptr = target;
443
444 ptr[0] = vcc->vpi >> 4;
445 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
446 ptr[2] = vcc->vci >> 4;
447 ptr[3] = vcc->vci << 4;
448 ptr[4] = 0xec;
449 ptr += ATM_CELL_HEADER;
450
451 memcpy(ptr, skb->data, data_len);
452 ptr += data_len;
453 __skb_pull(skb, data_len);
454
455 if(!left)
456 continue;
457
458 memset(ptr, 0, left);
459
460 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
461 u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
462 /* trailer[0] = 0; UU = 0 */
463 /* trailer[1] = 0; CPI = 0 */
464 trailer[2] = ctrl->len >> 8;
465 trailer[3] = ctrl->len;
466
467 ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4);
468
469 trailer[4] = ctrl->crc >> 24;
470 trailer[5] = ctrl->crc >> 16;
471 trailer[6] = ctrl->crc >> 8;
472 trailer[7] = ctrl->crc;
473
474 target[3] |= 0x2; /* adjust PTI */
475
476 ctrl->len = 0; /* tag this skb finished */
477 }
478 else
479 ctrl->crc = crc32_be(ctrl->crc, ptr, left);
480 }
481
6f749475 482 return bytes_written;
c59bba75
DS
483}
484
485
486/**************
487** receive **
488**************/
489
490static void usbatm_rx_process(unsigned long data)
491{
492 struct usbatm_data *instance = (struct usbatm_data *)data;
493 struct urb *urb;
494
495 while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
496 vdbg("%s: processing urb 0x%p", __func__, urb);
497
498 if (usb_pipeisoc(urb->pipe)) {
499 int i;
500 for (i = 0; i < urb->number_of_packets; i++)
501 if (!urb->iso_frame_desc[i].status)
502 usbatm_extract_cells(instance,
503 (u8 *)urb->transfer_buffer + urb->iso_frame_desc[i].offset,
504 urb->iso_frame_desc[i].actual_length);
505 }
506 else
507 if (!urb->status)
508 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
509
510 if (usbatm_submit_urb(urb))
511 return;
512 }
513}
514
515
516/***********
517** send **
518***********/
519
520static void usbatm_tx_process(unsigned long data)
521{
522 struct usbatm_data *instance = (struct usbatm_data *)data;
523 struct sk_buff *skb = instance->current_skb;
524 struct urb *urb = NULL;
525 const unsigned int buf_size = instance->tx_channel.buf_size;
6f749475 526 unsigned int bytes_written = 0;
c59bba75
DS
527 u8 *buffer = NULL;
528
529 if (!skb)
530 skb = skb_dequeue(&instance->sndqueue);
531
532 while (skb) {
533 if (!urb) {
534 urb = usbatm_pop_urb(&instance->tx_channel);
535 if (!urb)
536 break; /* no more senders */
537 buffer = urb->transfer_buffer;
6f749475 538 bytes_written = (urb->status == -EAGAIN) ?
c59bba75
DS
539 urb->transfer_buffer_length : 0;
540 }
541
6f749475
DS
542 bytes_written += usbatm_write_cells(instance, skb,
543 buffer + bytes_written,
544 buf_size - bytes_written);
c59bba75
DS
545
546 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p",
6f749475 547 __func__, bytes_written, skb, urb);
c59bba75
DS
548
549 if (!UDSL_SKB(skb)->len) {
550 struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
551
552 usbatm_pop(vcc, skb);
553 atomic_inc(&vcc->stats->tx);
554
555 skb = skb_dequeue(&instance->sndqueue);
556 }
557
6f749475
DS
558 if (bytes_written == buf_size || (!skb && bytes_written)) {
559 urb->transfer_buffer_length = bytes_written;
c59bba75
DS
560
561 if (usbatm_submit_urb(urb))
562 break;
563 urb = NULL;
564 }
565 }
566
567 instance->current_skb = skb;
568}
569
570static void usbatm_cancel_send(struct usbatm_data *instance,
571 struct atm_vcc *vcc)
572{
573 struct sk_buff *skb, *n;
574
575 atm_dbg(instance, "%s entered\n", __func__);
576 spin_lock_irq(&instance->sndqueue.lock);
577 for (skb = instance->sndqueue.next, n = skb->next;
578 skb != (struct sk_buff *)&instance->sndqueue;
579 skb = n, n = skb->next)
580 if (UDSL_SKB(skb)->atm.vcc == vcc) {
581 atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
582 __skb_unlink(skb, &instance->sndqueue);
583 usbatm_pop(vcc, skb);
584 }
585 spin_unlock_irq(&instance->sndqueue.lock);
586
587 tasklet_disable(&instance->tx_channel.tasklet);
588 if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
589 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
590 instance->current_skb = NULL;
591 usbatm_pop(vcc, skb);
592 }
593 tasklet_enable(&instance->tx_channel.tasklet);
594 atm_dbg(instance, "%s done\n", __func__);
595}
596
597static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
598{
599 struct usbatm_data *instance = vcc->dev->dev_data;
600 struct usbatm_control *ctrl = UDSL_SKB(skb);
601 int err;
602
603 vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);
604
0e42a627
DS
605 /* racy disconnection check - fine */
606 if (!instance || instance->disconnected) {
607#ifdef DEBUG
608 if (printk_ratelimit())
609 printk(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");
610#endif
c59bba75
DS
611 err = -ENODEV;
612 goto fail;
613 }
614
615 if (vcc->qos.aal != ATM_AAL5) {
0ec3c7e8 616 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
c59bba75
DS
617 err = -EINVAL;
618 goto fail;
619 }
620
621 if (skb->len > ATM_MAX_AAL5_PDU) {
0ec3c7e8 622 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
c59bba75
DS
623 __func__, skb->len, ATM_MAX_AAL5_PDU);
624 err = -EINVAL;
625 goto fail;
626 }
627
628 PACKETDEBUG(skb->data, skb->len);
629
630 /* initialize the control block */
631 ctrl->atm.vcc = vcc;
632 ctrl->len = skb->len;
633 ctrl->crc = crc32_be(~0, skb->data, skb->len);
634
635 skb_queue_tail(&instance->sndqueue, skb);
636 tasklet_schedule(&instance->tx_channel.tasklet);
637
638 return 0;
639
640 fail:
641 usbatm_pop(vcc, skb);
642 return err;
643}
644
645
646/********************
647** bean counting **
648********************/
649
650static void usbatm_destroy_instance(struct kref *kref)
651{
652 struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
653
654 dbg("%s", __func__);
655
656 tasklet_kill(&instance->rx_channel.tasklet);
657 tasklet_kill(&instance->tx_channel.tasklet);
658 usb_put_dev(instance->usb_dev);
659 kfree(instance);
660}
661
3d48586c 662static void usbatm_get_instance(struct usbatm_data *instance)
c59bba75
DS
663{
664 dbg("%s", __func__);
665
666 kref_get(&instance->refcount);
667}
668
3d48586c 669static void usbatm_put_instance(struct usbatm_data *instance)
c59bba75
DS
670{
671 dbg("%s", __func__);
672
673 kref_put(&instance->refcount, usbatm_destroy_instance);
674}
675
676
677/**********
678** ATM **
679**********/
680
0ec3c7e8 681static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
c59bba75 682{
0ec3c7e8 683 struct usbatm_data *instance = atm_dev->dev_data;
c59bba75
DS
684
685 dbg("%s", __func__);
686
687 if (!instance)
688 return;
689
0ec3c7e8 690 atm_dev->dev_data = NULL; /* catch bugs */
c59bba75
DS
691 usbatm_put_instance(instance); /* taken in usbatm_atm_init */
692}
693
694static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
695{
696 struct usbatm_data *instance = atm_dev->dev_data;
697 int left = *pos;
698
699 if (!instance) {
700 dbg("%s: NULL instance!", __func__);
701 return -ENODEV;
702 }
703
704 if (!left--)
705 return sprintf(page, "%s\n", instance->description);
706
707 if (!left--)
708 return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
709 atm_dev->esi[0], atm_dev->esi[1],
710 atm_dev->esi[2], atm_dev->esi[3],
711 atm_dev->esi[4], atm_dev->esi[5]);
712
713 if (!left--)
714 return sprintf(page,
715 "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
716 atomic_read(&atm_dev->stats.aal5.tx),
717 atomic_read(&atm_dev->stats.aal5.tx_err),
718 atomic_read(&atm_dev->stats.aal5.rx),
719 atomic_read(&atm_dev->stats.aal5.rx_err),
720 atomic_read(&atm_dev->stats.aal5.rx_drop));
721
0e42a627
DS
722 if (!left--) {
723 if (instance->disconnected)
724 return sprintf(page, "Disconnected\n");
725 else
726 switch (atm_dev->signal) {
727 case ATM_PHY_SIG_FOUND:
728 return sprintf(page, "Line up\n");
729 case ATM_PHY_SIG_LOST:
730 return sprintf(page, "Line down\n");
731 default:
732 return sprintf(page, "Line state unknown\n");
733 }
734 }
c59bba75
DS
735
736 return 0;
737}
738
739static int usbatm_atm_open(struct atm_vcc *vcc)
740{
741 struct usbatm_data *instance = vcc->dev->dev_data;
742 struct usbatm_vcc_data *new = NULL;
743 int ret;
744 int vci = vcc->vci;
745 short vpi = vcc->vpi;
746
747 if (!instance) {
748 dbg("%s: NULL data!", __func__);
749 return -ENODEV;
750 }
751
752 atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci);
753
754 /* only support AAL5 */
0ec3c7e8
DS
755 if ((vcc->qos.aal != ATM_AAL5)) {
756 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
757 return -EINVAL;
758 }
759
760 /* sanity checks */
761 if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
762 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu);
c59bba75
DS
763 return -EINVAL;
764 }
765
0ec3c7e8 766 down(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */
c59bba75 767
0e42a627
DS
768 if (instance->disconnected) {
769 atm_dbg(instance, "%s: disconnected!\n", __func__);
770 ret = -ENODEV;
771 goto fail;
772 }
773
c59bba75
DS
774 if (usbatm_find_vcc(instance, vpi, vci)) {
775 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
776 ret = -EADDRINUSE;
777 goto fail;
778 }
779
9a734efe 780 if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) {
0ec3c7e8 781 atm_err(instance, "%s: no memory for vcc_data!\n", __func__);
c59bba75
DS
782 ret = -ENOMEM;
783 goto fail;
784 }
785
c59bba75
DS
786 new->vcc = vcc;
787 new->vpi = vpi;
788 new->vci = vci;
789
790 new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
791 if (!new->sarb) {
0ec3c7e8 792 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__);
c59bba75
DS
793 ret = -ENOMEM;
794 goto fail;
795 }
796
797 vcc->dev_data = new;
798
799 tasklet_disable(&instance->rx_channel.tasklet);
800 list_add(&new->list, &instance->vcc_list);
801 tasklet_enable(&instance->rx_channel.tasklet);
802
803 set_bit(ATM_VF_ADDR, &vcc->flags);
804 set_bit(ATM_VF_PARTIAL, &vcc->flags);
805 set_bit(ATM_VF_READY, &vcc->flags);
806
807 up(&instance->serialize);
808
809 atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
810
811 return 0;
812
813fail:
814 kfree(new);
815 up(&instance->serialize);
816 return ret;
817}
818
819static void usbatm_atm_close(struct atm_vcc *vcc)
820{
821 struct usbatm_data *instance = vcc->dev->dev_data;
822 struct usbatm_vcc_data *vcc_data = vcc->dev_data;
823
824 if (!instance || !vcc_data) {
825 dbg("%s: NULL data!", __func__);
826 return;
827 }
828
829 atm_dbg(instance, "%s entered\n", __func__);
830
831 atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n",
832 __func__, vcc_data, vcc_data->vpi, vcc_data->vci);
833
834 usbatm_cancel_send(instance, vcc);
835
0ec3c7e8 836 down(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */
c59bba75
DS
837
838 tasklet_disable(&instance->rx_channel.tasklet);
839 list_del(&vcc_data->list);
840 tasklet_enable(&instance->rx_channel.tasklet);
841
842 kfree_skb(vcc_data->sarb);
843 vcc_data->sarb = NULL;
844
845 kfree(vcc_data);
846 vcc->dev_data = NULL;
847
848 vcc->vpi = ATM_VPI_UNSPEC;
849 vcc->vci = ATM_VCI_UNSPEC;
850 clear_bit(ATM_VF_READY, &vcc->flags);
851 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
852 clear_bit(ATM_VF_ADDR, &vcc->flags);
853
854 up(&instance->serialize);
855
856 atm_dbg(instance, "%s successful\n", __func__);
857}
858
0ec3c7e8 859static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd,
c59bba75
DS
860 void __user * arg)
861{
0e42a627
DS
862 struct usbatm_data *instance = atm_dev->dev_data;
863
864 if (!instance || instance->disconnected) {
865 dbg("%s: %s!", __func__, instance ? "disconnected" : "NULL instance");
866 return -ENODEV;
867 }
868
c59bba75
DS
869 switch (cmd) {
870 case ATM_QUERYLOOP:
871 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
872 default:
873 return -ENOIOCTLCMD;
874 }
875}
876
877static int usbatm_atm_init(struct usbatm_data *instance)
878{
879 struct atm_dev *atm_dev;
880 int ret, i;
881
0ec3c7e8
DS
882 /* ATM init. The ATM initialization scheme suffers from an intrinsic race
883 * condition: callbacks we register can be executed at once, before we have
884 * initialized the struct atm_dev. To protect against this, all callbacks
885 * abort if atm_dev->dev_data is NULL. */
c59bba75
DS
886 atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL);
887 if (!atm_dev) {
0ec3c7e8 888 usb_err(instance, "%s: failed to register ATM device!\n", __func__);
c59bba75
DS
889 return -1;
890 }
891
892 instance->atm_dev = atm_dev;
893
894 atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
895 atm_dev->ci_range.vci_bits = ATM_CI_MAX;
896 atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
897
898 /* temp init ATM device, set to 128kbit */
899 atm_dev->link_rate = 128 * 1000 / 424;
900
901 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
0ec3c7e8 902 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
c59bba75
DS
903 goto fail;
904 }
905
c59bba75 906 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */
0ec3c7e8
DS
907
908 /* ready for ATM callbacks */
c59bba75
DS
909 mb();
910 atm_dev->dev_data = instance;
911
912 /* submit all rx URBs */
913 for (i = 0; i < num_rcv_urbs; i++)
914 usbatm_submit_urb(instance->urbs[i]);
915
916 return 0;
917
918 fail:
919 instance->atm_dev = NULL;
64bf69dd 920 atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
c59bba75
DS
921 return ret;
922}
923
924
925/**********
926** USB **
927**********/
928
929static int usbatm_do_heavy_init(void *arg)
930{
931 struct usbatm_data *instance = arg;
932 int ret;
933
934 daemonize(instance->driver->driver_name);
935 allow_signal(SIGTERM);
936
937 complete(&instance->thread_started);
938
939 ret = instance->driver->heavy_init(instance, instance->usb_intf);
940
941 if (!ret)
942 ret = usbatm_atm_init(instance);
943
944 down(&instance->serialize);
945 instance->thread_pid = -1;
946 up(&instance->serialize);
947
948 complete_and_exit(&instance->thread_exited, ret);
949}
950
951static int usbatm_heavy_init(struct usbatm_data *instance)
952{
953 int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_KERNEL);
954
955 if (ret < 0) {
0ec3c7e8 956 usb_err(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret);
c59bba75
DS
957 return ret;
958 }
959
960 down(&instance->serialize);
961 instance->thread_pid = ret;
962 up(&instance->serialize);
963
964 wait_for_completion(&instance->thread_started);
965
966 return 0;
967}
968
969static void usbatm_tasklet_schedule(unsigned long data)
970{
971 tasklet_schedule((struct tasklet_struct *) data);
972}
973
974static inline void usbatm_init_channel(struct usbatm_channel *channel)
975{
976 spin_lock_init(&channel->lock);
977 INIT_LIST_HEAD(&channel->list);
978 channel->delay.function = usbatm_tasklet_schedule;
979 channel->delay.data = (unsigned long) &channel->tasklet;
980 init_timer(&channel->delay);
981}
982
983int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
984 struct usbatm_driver *driver)
985{
986 struct device *dev = &intf->dev;
987 struct usb_device *usb_dev = interface_to_usbdev(intf);
988 struct usbatm_data *instance;
989 char *buf;
990 int error = -ENOMEM;
991 int i, length;
6f749475 992 unsigned int maxpacket, num_packets;
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);
80aae7a1 1052 skb_queue_head_init(&instance->sndqueue);
c59bba75
DS
1053
1054 usbatm_init_channel(&instance->rx_channel);
1055 usbatm_init_channel(&instance->tx_channel);
1056 tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
1057 tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
c59bba75
DS
1058 instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
1059 instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
c59bba75
DS
1060 instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
1061
80aae7a1
DS
1062 if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in)
1063 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in);
1064 else
1065 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in);
1066
1067 instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out);
1068
6f749475
DS
1069 /* tx buffer size must be a positive multiple of the stride */
1070 instance->tx_channel.buf_size = max (instance->tx_channel.stride,
1071 snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride));
1072
1073 /* rx buffer size must be a positive multiple of the endpoint maxpacket */
1074 maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0);
1075
1076 if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) {
1077 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__,
1078 usb_pipeendpoint(instance->rx_channel.endpoint));
1079 error = -EINVAL;
1080 goto fail_unbind;
1081 }
1082
1083 num_packets = max (1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */
1084
1085 if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE)
1086 num_packets--;
1087
1088 instance->rx_channel.buf_size = num_packets * maxpacket;
80aae7a1 1089 instance->rx_channel.packet_size = maxpacket;
6f749475
DS
1090
1091#ifdef DEBUG
1092 for (i = 0; i < 2; i++) {
1093 struct usbatm_channel *channel = i ?
1094 &instance->tx_channel : &instance->rx_channel;
1095
1096 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel);
1097 }
1098#endif
1099
80aae7a1 1100 /* initialize urbs */
c59bba75
DS
1101
1102 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
c59bba75 1103 u8 *buffer;
c59bba75
DS
1104 struct usbatm_channel *channel = i < num_rcv_urbs ?
1105 &instance->rx_channel : &instance->tx_channel;
80aae7a1
DS
1106 struct urb *urb;
1107 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0;
c59bba75 1108
80aae7a1 1109 UDSL_ASSERT(!usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint));
c59bba75
DS
1110
1111 urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
1112 if (!urb) {
0ec3c7e8 1113 dev_err(dev, "%s: no memory for urb %d!\n", __func__, i);
72ef8ab4 1114 error = -ENOMEM;
c59bba75
DS
1115 goto fail_unbind;
1116 }
1117
65412e48
DS
1118 instance->urbs[i] = urb;
1119
9a734efe
DS
1120 /* zero the tx padding to avoid leaking information */
1121 buffer = kzalloc(channel->buf_size, GFP_KERNEL);
c59bba75 1122 if (!buffer) {
0ec3c7e8 1123 dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i);
72ef8ab4 1124 error = -ENOMEM;
c59bba75
DS
1125 goto fail_unbind;
1126 }
c59bba75
DS
1127
1128 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
1129 buffer, channel->buf_size, usbatm_complete, channel);
1130 if (iso_packets) {
1131 int j;
1132 urb->interval = 1;
1133 urb->transfer_flags = URB_ISO_ASAP;
1134 urb->number_of_packets = iso_packets;
1135 for (j = 0; j < iso_packets; j++) {
80aae7a1
DS
1136 urb->iso_frame_desc[j].offset = channel->packet_size * j;
1137 urb->iso_frame_desc[j].length = channel->packet_size;
c59bba75
DS
1138 }
1139 }
1140
1141 /* put all tx URBs on the list of spares */
1142 if (i >= num_rcv_urbs)
1143 list_add_tail(&urb->urb_list, &channel->list);
1144
1145 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p",
1146 __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
c59bba75
DS
1147 }
1148
35644b0c 1149 if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) {
c59bba75
DS
1150 error = usbatm_heavy_init(instance);
1151 } else {
1152 complete(&instance->thread_exited); /* pretend that heavy_init was run */
1153 error = usbatm_atm_init(instance);
1154 }
1155
1156 if (error < 0)
1157 goto fail_unbind;
1158
1159 usb_get_dev(usb_dev);
1160 usb_set_intfdata(intf, instance);
1161
1162 return 0;
1163
1164 fail_unbind:
1165 if (instance->driver->unbind)
1166 instance->driver->unbind(instance, intf);
1167 fail_free:
1168 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1169 if (instance->urbs[i])
1170 kfree(instance->urbs[i]->transfer_buffer);
1171 usb_free_urb(instance->urbs[i]);
1172 }
1173
1174 kfree (instance);
1175
1176 return error;
1177}
1178EXPORT_SYMBOL_GPL(usbatm_usb_probe);
1179
1180void usbatm_usb_disconnect(struct usb_interface *intf)
1181{
1182 struct device *dev = &intf->dev;
1183 struct usbatm_data *instance = usb_get_intfdata(intf);
0e42a627 1184 struct usbatm_vcc_data *vcc_data;
c59bba75
DS
1185 int i;
1186
1187 dev_dbg(dev, "%s entered\n", __func__);
1188
1189 if (!instance) {
1190 dev_dbg(dev, "%s: NULL instance!\n", __func__);
1191 return;
1192 }
1193
1194 usb_set_intfdata(intf, NULL);
1195
1196 down(&instance->serialize);
0e42a627 1197 instance->disconnected = 1;
c59bba75
DS
1198 if (instance->thread_pid >= 0)
1199 kill_proc(instance->thread_pid, SIGTERM, 1);
1200 up(&instance->serialize);
1201
1202 wait_for_completion(&instance->thread_exited);
1203
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DS
1204 down(&instance->serialize);
1205 list_for_each_entry(vcc_data, &instance->vcc_list, list)
1206 vcc_release_async(vcc_data->vcc, -EPIPE);
1207 up(&instance->serialize);
1208
c59bba75
DS
1209 tasklet_disable(&instance->rx_channel.tasklet);
1210 tasklet_disable(&instance->tx_channel.tasklet);
1211
1212 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
1213 usb_kill_urb(instance->urbs[i]);
1214
1215 del_timer_sync(&instance->rx_channel.delay);
1216 del_timer_sync(&instance->tx_channel.delay);
1217
0e42a627
DS
1218 /* turn usbatm_[rt]x_process into something close to a no-op */
1219 /* no need to take the spinlock */
1220 INIT_LIST_HEAD(&instance->rx_channel.list);
1221 INIT_LIST_HEAD(&instance->tx_channel.list);
1222
1223 tasklet_enable(&instance->rx_channel.tasklet);
1224 tasklet_enable(&instance->tx_channel.tasklet);
1225
c59bba75
DS
1226 if (instance->atm_dev && instance->driver->atm_stop)
1227 instance->driver->atm_stop(instance, instance->atm_dev);
1228
1229 if (instance->driver->unbind)
1230 instance->driver->unbind(instance, intf);
1231
1232 instance->driver_data = NULL;
1233
c59bba75
DS
1234 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1235 kfree(instance->urbs[i]->transfer_buffer);
1236 usb_free_urb(instance->urbs[i]);
1237 }
1238
1239 /* ATM finalize */
1240 if (instance->atm_dev)
64bf69dd 1241 atm_dev_deregister(instance->atm_dev);
c59bba75
DS
1242
1243 usbatm_put_instance(instance); /* taken in usbatm_usb_probe */
1244}
1245EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
1246
1247
1248/***********
1249** init **
1250***********/
1251
1252static int __init usbatm_usb_init(void)
1253{
1254 dbg("%s: driver version %s", __func__, DRIVER_VERSION);
1255
1256 if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) {
1257 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
1258 return -EIO;
1259 }
1260
1261 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1262 || (num_snd_urbs > UDSL_MAX_SND_URBS)
6f749475
DS
1263 || (rcv_buf_bytes < 1)
1264 || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE)
1265 || (snd_buf_bytes < 1)
1266 || (snd_buf_bytes > UDSL_MAX_BUF_SIZE))
c59bba75
DS
1267 return -EINVAL;
1268
1269 return 0;
1270}
1271module_init(usbatm_usb_init);
1272
1273static void __exit usbatm_usb_exit(void)
1274{
1275 dbg("%s", __func__);
1276}
1277module_exit(usbatm_usb_exit);
1278
1279MODULE_AUTHOR(DRIVER_AUTHOR);
1280MODULE_DESCRIPTION(DRIVER_DESC);
1281MODULE_LICENSE("GPL");
1282MODULE_VERSION(DRIVER_VERSION);
1283
1284/************
1285** debug **
1286************/
1287
1288#ifdef VERBOSE_DEBUG
1289static int usbatm_print_packet(const unsigned char *data, int len)
1290{
1291 unsigned char buffer[256];
1292 int i = 0, j = 0;
1293
1294 for (i = 0; i < len;) {
1295 buffer[0] = '\0';
1296 sprintf(buffer, "%.3d :", i);
1297 for (j = 0; (j < 16) && (i < len); j++, i++) {
1298 sprintf(buffer, "%s %2.2x", buffer, data[i]);
1299 }
1300 dbg("%s", buffer);
1301 }
1302 return i;
1303}
1304#endif
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