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IB/ipath: Remove tests of PCI_MSI in ipath_iba7220.c
[linux-2.6/linux-2.6-openrd.git] / drivers / usb / atm / usbatm.c
blobe717f5b1caeeedeadbf51634726356311faa4c95
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
84 #ifdef VERBOSE_DEBUG
85 static int usbatm_print_packet(const unsigned char *data, int len);
86 #define PACKETDEBUG(arg...) usbatm_print_packet (arg)
87 #define vdbg(arg...) dbg (arg)
88 #else
89 #define PACKETDEBUG(arg...)
90 #define vdbg(arg...)
91 #endif
92
93 #define DRIVER_AUTHOR "Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
94 #define DRIVER_VERSION "1.10"
95 #define DRIVER_DESC "Generic USB ATM/DSL I/O, version " DRIVER_VERSION
96
97 static const char usbatm_driver_name[] = "usbatm";
98
99 #define UDSL_MAX_RCV_URBS 16
100 #define UDSL_MAX_SND_URBS 16
101 #define UDSL_MAX_BUF_SIZE 65536
102 #define UDSL_DEFAULT_RCV_URBS 4
103 #define UDSL_DEFAULT_SND_URBS 4
104 #define UDSL_DEFAULT_RCV_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
105 #define UDSL_DEFAULT_SND_BUF_SIZE 3392 /* 64 * ATM_CELL_SIZE */
106
107 #define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
108
109 #define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */
110
111 static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
112 static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
113 static unsigned int rcv_buf_bytes = UDSL_DEFAULT_RCV_BUF_SIZE;
114 static unsigned int snd_buf_bytes = UDSL_DEFAULT_SND_BUF_SIZE;
115
116 module_param(num_rcv_urbs, uint, S_IRUGO);
117 MODULE_PARM_DESC(num_rcv_urbs,
118 "Number of urbs used for reception (range: 0-"
119 __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
120 __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
121
122 module_param(num_snd_urbs, uint, S_IRUGO);
123 MODULE_PARM_DESC(num_snd_urbs,
124 "Number of urbs used for transmission (range: 0-"
125 __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
126 __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
127
128 module_param(rcv_buf_bytes, uint, S_IRUGO);
129 MODULE_PARM_DESC(rcv_buf_bytes,
130 "Size of the buffers used for reception, in bytes (range: 1-"
131 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
132 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
133
134 module_param(snd_buf_bytes, uint, S_IRUGO);
135 MODULE_PARM_DESC(snd_buf_bytes,
136 "Size of the buffers used for transmission, in bytes (range: 1-"
137 __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
138 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
139
140
141 /* receive */
142
143 struct usbatm_vcc_data {
144 /* vpi/vci lookup */
145 struct list_head list;
146 short vpi;
147 int vci;
148 struct atm_vcc *vcc;
149
150 /* raw cell reassembly */
151 struct sk_buff *sarb;
152 };
153
154
155 /* send */
156
157 struct usbatm_control {
158 struct atm_skb_data atm;
159 u32 len;
160 u32 crc;
161 };
162
163 #define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb)
164
165
166 /* ATM */
167
168 static void usbatm_atm_dev_close(struct atm_dev *atm_dev);
169 static int usbatm_atm_open(struct atm_vcc *vcc);
170 static void usbatm_atm_close(struct atm_vcc *vcc);
171 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd, void __user * arg);
172 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
173 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
174
175 static struct atmdev_ops usbatm_atm_devops = {
176 .dev_close = usbatm_atm_dev_close,
177 .open = usbatm_atm_open,
178 .close = usbatm_atm_close,
179 .ioctl = usbatm_atm_ioctl,
180 .send = usbatm_atm_send,
181 .proc_read = usbatm_atm_proc_read,
182 .owner = THIS_MODULE,
183 };
184
185
186 /***********
187 ** misc **
188 ***********/
189
190 static inline unsigned int usbatm_pdu_length(unsigned int length)
191 {
192 length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER;
193 return length - length % ATM_CELL_PAYLOAD;
194 }
195
196 static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
197 {
198 if (vcc->pop)
199 vcc->pop(vcc, skb);
200 else
201 dev_kfree_skb_any(skb);
202 }
203
204
205 /***********
206 ** urbs **
207 ************/
208
209 static struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
210 {
211 struct urb *urb;
212
213 spin_lock_irq(&channel->lock);
214 if (list_empty(&channel->list)) {
215 spin_unlock_irq(&channel->lock);
216 return NULL;
217 }
218
219 urb = list_entry(channel->list.next, struct urb, urb_list);
220 list_del(&urb->urb_list);
221 spin_unlock_irq(&channel->lock);
222
223 return urb;
224 }
225
226 static int usbatm_submit_urb(struct urb *urb)
227 {
228 struct usbatm_channel *channel = urb->context;
229 int ret;
230
231 vdbg("%s: submitting urb 0x%p, size %u",
232 __func__, urb, urb->transfer_buffer_length);
233
234 ret = usb_submit_urb(urb, GFP_ATOMIC);
235 if (ret) {
236 if (printk_ratelimit())
237 atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
238 __func__, urb, ret);
239
240 /* consider all errors transient and return the buffer back to the queue */
241 urb->status = -EAGAIN;
242 spin_lock_irq(&channel->lock);
243
244 /* must add to the front when sending; doesn't matter when receiving */
245 list_add(&urb->urb_list, &channel->list);
246
247 spin_unlock_irq(&channel->lock);
248
249 /* make sure the channel doesn't stall */
250 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
251 }
252
253 return ret;
254 }
255
256 static void usbatm_complete(struct urb *urb)
257 {
258 struct usbatm_channel *channel = urb->context;
259 unsigned long flags;
260 int status = urb->status;
261
262 vdbg("%s: urb 0x%p, status %d, actual_length %d",
263 __func__, urb, status, urb->actual_length);
264
265 /* usually in_interrupt(), but not always */
266 spin_lock_irqsave(&channel->lock, flags);
267
268 /* must add to the back when receiving; doesn't matter when sending */
269 list_add_tail(&urb->urb_list, &channel->list);
270
271 spin_unlock_irqrestore(&channel->lock, flags);
272
273 if (unlikely(status) &&
274 (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) ||
275 status != -EILSEQ ))
276 {
277 if (status == -ESHUTDOWN)
278 return;
279
280 if (printk_ratelimit())
281 atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n",
282 __func__, urb, status);
283 /* throttle processing in case of an error */
284 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
285 } else
286 tasklet_schedule(&channel->tasklet);
287 }
288
289
290 /*************
291 ** decode **
292 *************/
293
294 static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
295 short vpi, int vci)
296 {
297 struct usbatm_vcc_data *vcc_data;
298
299 list_for_each_entry(vcc_data, &instance->vcc_list, list)
300 if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi))
301 return vcc_data;
302 return NULL;
303 }
304
305 static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source)
306 {
307 struct atm_vcc *vcc;
308 struct sk_buff *sarb;
309 short vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4);
310 int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
311 u8 pti = ((source[3] & 0xe) >> 1);
312
313 vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
314
315 if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) {
316 instance->cached_vpi = vpi;
317 instance->cached_vci = vci;
318
319 instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci);
320
321 if (!instance->cached_vcc)
322 atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
323 }
324
325 if (!instance->cached_vcc)
326 return;
327
328 vcc = instance->cached_vcc->vcc;
329
330 /* OAM F5 end-to-end */
331 if (pti == ATM_PTI_E2EF5) {
332 if (printk_ratelimit())
333 atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
334 __func__, vpi, vci);
335 atomic_inc(&vcc->stats->rx_err);
336 return;
337 }
338
339 sarb = instance->cached_vcc->sarb;
340
341 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
342 atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
343 __func__, sarb->len, vcc);
344 /* discard cells already received */
345 skb_trim(sarb, 0);
346 UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end);
347 }
348
349 memcpy(skb_tail_pointer(sarb), source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
350 __skb_put(sarb, ATM_CELL_PAYLOAD);
351
352 if (pti & 1) {
353 struct sk_buff *skb;
354 unsigned int length;
355 unsigned int pdu_length;
356
357 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
358
359 /* guard against overflow */
360 if (length > ATM_MAX_AAL5_PDU) {
361 atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
362 __func__, length, vcc);
363 atomic_inc(&vcc->stats->rx_err);
364 goto out;
365 }
366
367 pdu_length = usbatm_pdu_length(length);
368
369 if (sarb->len < pdu_length) {
370 atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
371 __func__, pdu_length, sarb->len, vcc);
372 atomic_inc(&vcc->stats->rx_err);
373 goto out;
374 }
375
376 if (crc32_be(~0, skb_tail_pointer(sarb) - pdu_length, pdu_length) != 0xc704dd7b) {
377 atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
378 __func__, vcc);
379 atomic_inc(&vcc->stats->rx_err);
380 goto out;
381 }
382
383 vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
384
385 if (!(skb = dev_alloc_skb(length))) {
386 if (printk_ratelimit())
387 atm_err(instance, "%s: no memory for skb (length: %u)!\n",
388 __func__, length);
389 atomic_inc(&vcc->stats->rx_drop);
390 goto out;
391 }
392
393 vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
394
395 if (!atm_charge(vcc, skb->truesize)) {
396 atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
397 __func__, skb->truesize);
398 dev_kfree_skb_any(skb);
399 goto out; /* atm_charge increments rx_drop */
400 }
401
402 skb_copy_to_linear_data(skb,
403 skb_tail_pointer(sarb) - pdu_length,
404 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 static void usbatm_extract_cells(struct usbatm_data *instance,
421 unsigned char *source, unsigned int avail_data)
422 {
423 unsigned int stride = instance->rx_channel.stride;
424 unsigned int buf_usage = instance->buf_usage;
425
426 /* extract cells from incoming data, taking into account that
427 * the length of avail data may not be a multiple of stride */
428
429 if (buf_usage > 0) {
430 /* we have a partially received atm cell */
431 unsigned char *cell_buf = instance->cell_buf;
432 unsigned int space_left = stride - buf_usage;
433
434 UDSL_ASSERT(buf_usage <= stride);
435
436 if (avail_data >= space_left) {
437 /* add new data and process cell */
438 memcpy(cell_buf + buf_usage, source, space_left);
439 source += space_left;
440 avail_data -= space_left;
441 usbatm_extract_one_cell(instance, cell_buf);
442 instance->buf_usage = 0;
443 } else {
444 /* not enough data to fill the cell */
445 memcpy(cell_buf + buf_usage, source, avail_data);
446 instance->buf_usage = buf_usage + avail_data;
447 return;
448 }
449 }
450
451 for (; avail_data >= stride; avail_data -= stride, source += stride)
452 usbatm_extract_one_cell(instance, source);
453
454 if (avail_data > 0) {
455 /* length was not a multiple of stride -
456 * save remaining data for next call */
457 memcpy(instance->cell_buf, source, avail_data);
458 instance->buf_usage = avail_data;
459 }
460 }
461
462
463 /*************
464 ** encode **
465 *************/
466
467 static unsigned int usbatm_write_cells(struct usbatm_data *instance,
468 struct sk_buff *skb,
469 u8 *target, unsigned int avail_space)
470 {
471 struct usbatm_control *ctrl = UDSL_SKB(skb);
472 struct atm_vcc *vcc = ctrl->atm.vcc;
473 unsigned int bytes_written;
474 unsigned int stride = instance->tx_channel.stride;
475
476 vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space);
477 UDSL_ASSERT(!(avail_space % stride));
478
479 for (bytes_written = 0; bytes_written < avail_space && ctrl->len;
480 bytes_written += stride, target += stride) {
481 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
482 unsigned int left = ATM_CELL_PAYLOAD - data_len;
483 u8 *ptr = target;
484
485 ptr[0] = vcc->vpi >> 4;
486 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
487 ptr[2] = vcc->vci >> 4;
488 ptr[3] = vcc->vci << 4;
489 ptr[4] = 0xec;
490 ptr += ATM_CELL_HEADER;
491
492 skb_copy_from_linear_data(skb, ptr, data_len);
493 ptr += data_len;
494 __skb_pull(skb, data_len);
495
496 if(!left)
497 continue;
498
499 memset(ptr, 0, left);
500
501 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
502 u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
503 /* trailer[0] = 0; UU = 0 */
504 /* trailer[1] = 0; CPI = 0 */
505 trailer[2] = ctrl->len >> 8;
506 trailer[3] = ctrl->len;
507
508 ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4);
509
510 trailer[4] = ctrl->crc >> 24;
511 trailer[5] = ctrl->crc >> 16;
512 trailer[6] = ctrl->crc >> 8;
513 trailer[7] = ctrl->crc;
514
515 target[3] |= 0x2; /* adjust PTI */
516
517 ctrl->len = 0; /* tag this skb finished */
518 }
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
531 static 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(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
585 static 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
635 static 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 for (skb = instance->sndqueue.next, n = skb->next;
643 skb != (struct sk_buff *)&instance->sndqueue;
644 skb = n, n = skb->next)
645 if (UDSL_SKB(skb)->atm.vcc == vcc) {
646 atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
647 __skb_unlink(skb, &instance->sndqueue);
648 usbatm_pop(vcc, skb);
649 }
650 spin_unlock_irq(&instance->sndqueue.lock);
651
652 tasklet_disable(&instance->tx_channel.tasklet);
653 if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
654 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
655 instance->current_skb = NULL;
656 usbatm_pop(vcc, skb);
657 }
658 tasklet_enable(&instance->tx_channel.tasklet);
659 atm_dbg(instance, "%s done\n", __func__);
660 }
661
662 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
663 {
664 struct usbatm_data *instance = vcc->dev->dev_data;
665 struct usbatm_control *ctrl = UDSL_SKB(skb);
666 int err;
667
668 vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);
669
670 /* racy disconnection check - fine */
671 if (!instance || instance->disconnected) {
672 #ifdef DEBUG
673 if (printk_ratelimit())
674 printk(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");
675 #endif
676 err = -ENODEV;
677 goto fail;
678 }
679
680 if (vcc->qos.aal != ATM_AAL5) {
681 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
682 err = -EINVAL;
683 goto fail;
684 }
685
686 if (skb->len > ATM_MAX_AAL5_PDU) {
687 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
688 __func__, skb->len, ATM_MAX_AAL5_PDU);
689 err = -EINVAL;
690 goto fail;
691 }
692
693 PACKETDEBUG(skb->data, skb->len);
694
695 /* initialize the control block */
696 ctrl->atm.vcc = vcc;
697 ctrl->len = skb->len;
698 ctrl->crc = crc32_be(~0, skb->data, skb->len);
699
700 skb_queue_tail(&instance->sndqueue, skb);
701 tasklet_schedule(&instance->tx_channel.tasklet);
702
703 return 0;
704
705 fail:
706 usbatm_pop(vcc, skb);
707 return err;
708 }
709
710
711 /********************
712 ** bean counting **
713 ********************/
714
715 static void usbatm_destroy_instance(struct kref *kref)
716 {
717 struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
718
719 dbg("%s", __func__);
720
721 tasklet_kill(&instance->rx_channel.tasklet);
722 tasklet_kill(&instance->tx_channel.tasklet);
723 usb_put_dev(instance->usb_dev);
724 kfree(instance);
725 }
726
727 static void usbatm_get_instance(struct usbatm_data *instance)
728 {
729 dbg("%s", __func__);
730
731 kref_get(&instance->refcount);
732 }
733
734 static void usbatm_put_instance(struct usbatm_data *instance)
735 {
736 dbg("%s", __func__);
737
738 kref_put(&instance->refcount, usbatm_destroy_instance);
739 }
740
741
742 /**********
743 ** ATM **
744 **********/
745
746 static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
747 {
748 struct usbatm_data *instance = atm_dev->dev_data;
749
750 dbg("%s", __func__);
751
752 if (!instance)
753 return;
754
755 atm_dev->dev_data = NULL; /* catch bugs */
756 usbatm_put_instance(instance); /* taken in usbatm_atm_init */
757 }
758
759 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
760 {
761 struct usbatm_data *instance = atm_dev->dev_data;
762 int left = *pos;
763
764 if (!instance) {
765 dbg("%s: NULL instance!", __func__);
766 return -ENODEV;
767 }
768
769 if (!left--)
770 return sprintf(page, "%s\n", instance->description);
771
772 if (!left--)
773 return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
774 atm_dev->esi[0], atm_dev->esi[1],
775 atm_dev->esi[2], atm_dev->esi[3],
776 atm_dev->esi[4], atm_dev->esi[5]);
777
778 if (!left--)
779 return sprintf(page,
780 "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
781 atomic_read(&atm_dev->stats.aal5.tx),
782 atomic_read(&atm_dev->stats.aal5.tx_err),
783 atomic_read(&atm_dev->stats.aal5.rx),
784 atomic_read(&atm_dev->stats.aal5.rx_err),
785 atomic_read(&atm_dev->stats.aal5.rx_drop));
786
787 if (!left--) {
788 if (instance->disconnected)
789 return sprintf(page, "Disconnected\n");
790 else
791 switch (atm_dev->signal) {
792 case ATM_PHY_SIG_FOUND:
793 return sprintf(page, "Line up\n");
794 case ATM_PHY_SIG_LOST:
795 return sprintf(page, "Line down\n");
796 default:
797 return sprintf(page, "Line state unknown\n");
798 }
799 }
800
801 return 0;
802 }
803
804 static int usbatm_atm_open(struct atm_vcc *vcc)
805 {
806 struct usbatm_data *instance = vcc->dev->dev_data;
807 struct usbatm_vcc_data *new = NULL;
808 int ret;
809 int vci = vcc->vci;
810 short vpi = vcc->vpi;
811
812 if (!instance) {
813 dbg("%s: NULL data!", __func__);
814 return -ENODEV;
815 }
816
817 atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci);
818
819 /* only support AAL5 */
820 if ((vcc->qos.aal != ATM_AAL5)) {
821 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
822 return -EINVAL;
823 }
824
825 /* sanity checks */
826 if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
827 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu);
828 return -EINVAL;
829 }
830
831 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_close, usbatm_usb_disconnect */
832
833 if (instance->disconnected) {
834 atm_dbg(instance, "%s: disconnected!\n", __func__);
835 ret = -ENODEV;
836 goto fail;
837 }
838
839 if (usbatm_find_vcc(instance, vpi, vci)) {
840 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
841 ret = -EADDRINUSE;
842 goto fail;
843 }
844
845 if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) {
846 atm_err(instance, "%s: no memory for vcc_data!\n", __func__);
847 ret = -ENOMEM;
848 goto fail;
849 }
850
851 new->vcc = vcc;
852 new->vpi = vpi;
853 new->vci = vci;
854
855 new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
856 if (!new->sarb) {
857 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__);
858 ret = -ENOMEM;
859 goto fail;
860 }
861
862 vcc->dev_data = new;
863
864 tasklet_disable(&instance->rx_channel.tasklet);
865 instance->cached_vcc = new;
866 instance->cached_vpi = vpi;
867 instance->cached_vci = vci;
868 list_add(&new->list, &instance->vcc_list);
869 tasklet_enable(&instance->rx_channel.tasklet);
870
871 set_bit(ATM_VF_ADDR, &vcc->flags);
872 set_bit(ATM_VF_PARTIAL, &vcc->flags);
873 set_bit(ATM_VF_READY, &vcc->flags);
874
875 mutex_unlock(&instance->serialize);
876
877 atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
878
879 return 0;
880
881 fail:
882 kfree(new);
883 mutex_unlock(&instance->serialize);
884 return ret;
885 }
886
887 static void usbatm_atm_close(struct atm_vcc *vcc)
888 {
889 struct usbatm_data *instance = vcc->dev->dev_data;
890 struct usbatm_vcc_data *vcc_data = vcc->dev_data;
891
892 if (!instance || !vcc_data) {
893 dbg("%s: NULL data!", __func__);
894 return;
895 }
896
897 atm_dbg(instance, "%s entered\n", __func__);
898
899 atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n",
900 __func__, vcc_data, vcc_data->vpi, vcc_data->vci);
901
902 usbatm_cancel_send(instance, vcc);
903
904 mutex_lock(&instance->serialize); /* vs self, usbatm_atm_open, usbatm_usb_disconnect */
905
906 tasklet_disable(&instance->rx_channel.tasklet);
907 if (instance->cached_vcc == vcc_data) {
908 instance->cached_vcc = NULL;
909 instance->cached_vpi = ATM_VPI_UNSPEC;
910 instance->cached_vci = ATM_VCI_UNSPEC;
911 }
912 list_del(&vcc_data->list);
913 tasklet_enable(&instance->rx_channel.tasklet);
914
915 kfree_skb(vcc_data->sarb);
916 vcc_data->sarb = NULL;
917
918 kfree(vcc_data);
919 vcc->dev_data = NULL;
920
921 vcc->vpi = ATM_VPI_UNSPEC;
922 vcc->vci = ATM_VCI_UNSPEC;
923 clear_bit(ATM_VF_READY, &vcc->flags);
924 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
925 clear_bit(ATM_VF_ADDR, &vcc->flags);
926
927 mutex_unlock(&instance->serialize);
928
929 atm_dbg(instance, "%s successful\n", __func__);
930 }
931
932 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd,
933 void __user * arg)
934 {
935 struct usbatm_data *instance = atm_dev->dev_data;
936
937 if (!instance || instance->disconnected) {
938 dbg("%s: %s!", __func__, instance ? "disconnected" : "NULL instance");
939 return -ENODEV;
940 }
941
942 switch (cmd) {
943 case ATM_QUERYLOOP:
944 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
945 default:
946 return -ENOIOCTLCMD;
947 }
948 }
949
950 static int usbatm_atm_init(struct usbatm_data *instance)
951 {
952 struct atm_dev *atm_dev;
953 int ret, i;
954
955 /* ATM init. The ATM initialization scheme suffers from an intrinsic race
956 * condition: callbacks we register can be executed at once, before we have
957 * initialized the struct atm_dev. To protect against this, all callbacks
958 * abort if atm_dev->dev_data is NULL. */
959 atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL);
960 if (!atm_dev) {
961 usb_err(instance, "%s: failed to register ATM device!\n", __func__);
962 return -1;
963 }
964
965 instance->atm_dev = atm_dev;
966
967 atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
968 atm_dev->ci_range.vci_bits = ATM_CI_MAX;
969 atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
970
971 /* temp init ATM device, set to 128kbit */
972 atm_dev->link_rate = 128 * 1000 / 424;
973
974 ret = sysfs_create_link(&atm_dev->class_dev.kobj,
975 &instance->usb_intf->dev.kobj, "device");
976 if (ret) {
977 atm_err(instance, "%s: sysfs_create_link failed: %d\n",
978 __func__, ret);
979 goto fail_sysfs;
980 }
981
982 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
983 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
984 goto fail;
985 }
986
987 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */
988
989 /* ready for ATM callbacks */
990 mb();
991 atm_dev->dev_data = instance;
992
993 /* submit all rx URBs */
994 for (i = 0; i < num_rcv_urbs; i++)
995 usbatm_submit_urb(instance->urbs[i]);
996
997 return 0;
998
999 fail:
1000 sysfs_remove_link(&atm_dev->class_dev.kobj, "device");
1001 fail_sysfs:
1002 instance->atm_dev = NULL;
1003 atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
1004 return ret;
1005 }
1006
1007
1008 /**********
1009 ** USB **
1010 **********/
1011
1012 static int usbatm_do_heavy_init(void *arg)
1013 {
1014 struct usbatm_data *instance = arg;
1015 int ret;
1016
1017 daemonize(instance->driver->driver_name);
1018 allow_signal(SIGTERM);
1019 instance->thread_pid = current->pid;
1020
1021 complete(&instance->thread_started);
1022
1023 ret = instance->driver->heavy_init(instance, instance->usb_intf);
1024
1025 if (!ret)
1026 ret = usbatm_atm_init(instance);
1027
1028 mutex_lock(&instance->serialize);
1029 instance->thread_pid = -1;
1030 mutex_unlock(&instance->serialize);
1031
1032 complete_and_exit(&instance->thread_exited, ret);
1033 }
1034
1035 static int usbatm_heavy_init(struct usbatm_data *instance)
1036 {
1037 int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_FS | CLONE_FILES);
1038
1039 if (ret < 0) {
1040 usb_err(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret);
1041 return ret;
1042 }
1043
1044 wait_for_completion(&instance->thread_started);
1045
1046 return 0;
1047 }
1048
1049 static void usbatm_tasklet_schedule(unsigned long data)
1050 {
1051 tasklet_schedule((struct tasklet_struct *) data);
1052 }
1053
1054 static void usbatm_init_channel(struct usbatm_channel *channel)
1055 {
1056 spin_lock_init(&channel->lock);
1057 INIT_LIST_HEAD(&channel->list);
1058 channel->delay.function = usbatm_tasklet_schedule;
1059 channel->delay.data = (unsigned long) &channel->tasklet;
1060 init_timer(&channel->delay);
1061 }
1062
1063 int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
1064 struct usbatm_driver *driver)
1065 {
1066 struct device *dev = &intf->dev;
1067 struct usb_device *usb_dev = interface_to_usbdev(intf);
1068 struct usbatm_data *instance;
1069 char *buf;
1070 int error = -ENOMEM;
1071 int i, length;
1072 unsigned int maxpacket, num_packets;
1073
1074 dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n",
1075 __func__, driver->driver_name,
1076 le16_to_cpu(usb_dev->descriptor.idVendor),
1077 le16_to_cpu(usb_dev->descriptor.idProduct),
1078 intf->altsetting->desc.bInterfaceNumber);
1079
1080 /* instance init */
1081 instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
1082 if (!instance) {
1083 dev_err(dev, "%s: no memory for instance data!\n", __func__);
1084 return -ENOMEM;
1085 }
1086
1087 /* public fields */
1088
1089 instance->driver = driver;
1090 snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name);
1091
1092 instance->usb_dev = usb_dev;
1093 instance->usb_intf = intf;
1094
1095 buf = instance->description;
1096 length = sizeof(instance->description);
1097
1098 if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
1099 goto bind;
1100
1101 buf += i;
1102 length -= i;
1103
1104 i = scnprintf(buf, length, " (");
1105 buf += i;
1106 length -= i;
1107
1108 if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
1109 goto bind;
1110
1111 buf += i;
1112 length -= i;
1113
1114 snprintf(buf, length, ")");
1115
1116 bind:
1117 if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) {
1118 dev_err(dev, "%s: bind failed: %d!\n", __func__, error);
1119 goto fail_free;
1120 }
1121
1122 /* private fields */
1123
1124 kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */
1125 mutex_init(&instance->serialize);
1126
1127 instance->thread_pid = -1;
1128 init_completion(&instance->thread_started);
1129 init_completion(&instance->thread_exited);
1130
1131 INIT_LIST_HEAD(&instance->vcc_list);
1132 skb_queue_head_init(&instance->sndqueue);
1133
1134 usbatm_init_channel(&instance->rx_channel);
1135 usbatm_init_channel(&instance->tx_channel);
1136 tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
1137 tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
1138 instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
1139 instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
1140 instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
1141
1142 if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in)
1143 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in);
1144 else
1145 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in);
1146
1147 instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out);
1148
1149 /* tx buffer size must be a positive multiple of the stride */
1150 instance->tx_channel.buf_size = max (instance->tx_channel.stride,
1151 snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride));
1152
1153 /* rx buffer size must be a positive multiple of the endpoint maxpacket */
1154 maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0);
1155
1156 if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) {
1157 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__,
1158 usb_pipeendpoint(instance->rx_channel.endpoint));
1159 error = -EINVAL;
1160 goto fail_unbind;
1161 }
1162
1163 num_packets = max (1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */
1164
1165 if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE)
1166 num_packets--;
1167
1168 instance->rx_channel.buf_size = num_packets * maxpacket;
1169 instance->rx_channel.packet_size = maxpacket;
1170
1171 #ifdef DEBUG
1172 for (i = 0; i < 2; i++) {
1173 struct usbatm_channel *channel = i ?
1174 &instance->tx_channel : &instance->rx_channel;
1175
1176 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel);
1177 }
1178 #endif
1179
1180 /* initialize urbs */
1181
1182 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1183 u8 *buffer;
1184 struct usbatm_channel *channel = i < num_rcv_urbs ?
1185 &instance->rx_channel : &instance->tx_channel;
1186 struct urb *urb;
1187 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0;
1188
1189 UDSL_ASSERT(!usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint));
1190
1191 urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
1192 if (!urb) {
1193 dev_err(dev, "%s: no memory for urb %d!\n", __func__, i);
1194 error = -ENOMEM;
1195 goto fail_unbind;
1196 }
1197
1198 instance->urbs[i] = urb;
1199
1200 /* zero the tx padding to avoid leaking information */
1201 buffer = kzalloc(channel->buf_size, GFP_KERNEL);
1202 if (!buffer) {
1203 dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i);
1204 error = -ENOMEM;
1205 goto fail_unbind;
1206 }
1207
1208 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
1209 buffer, channel->buf_size, usbatm_complete, channel);
1210 if (iso_packets) {
1211 int j;
1212 urb->interval = 1;
1213 urb->transfer_flags = URB_ISO_ASAP;
1214 urb->number_of_packets = iso_packets;
1215 for (j = 0; j < iso_packets; j++) {
1216 urb->iso_frame_desc[j].offset = channel->packet_size * j;
1217 urb->iso_frame_desc[j].length = channel->packet_size;
1218 }
1219 }
1220
1221 /* put all tx URBs on the list of spares */
1222 if (i >= num_rcv_urbs)
1223 list_add_tail(&urb->urb_list, &channel->list);
1224
1225 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p",
1226 __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
1227 }
1228
1229 instance->cached_vpi = ATM_VPI_UNSPEC;
1230 instance->cached_vci = ATM_VCI_UNSPEC;
1231 instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL);
1232
1233 if (!instance->cell_buf) {
1234 dev_err(dev, "%s: no memory for cell buffer!\n", __func__);
1235 error = -ENOMEM;
1236 goto fail_unbind;
1237 }
1238
1239 if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) {
1240 error = usbatm_heavy_init(instance);
1241 } else {
1242 complete(&instance->thread_exited); /* pretend that heavy_init was run */
1243 error = usbatm_atm_init(instance);
1244 }
1245
1246 if (error < 0)
1247 goto fail_unbind;
1248
1249 usb_get_dev(usb_dev);
1250 usb_set_intfdata(intf, instance);
1251
1252 return 0;
1253
1254 fail_unbind:
1255 if (instance->driver->unbind)
1256 instance->driver->unbind(instance, intf);
1257 fail_free:
1258 kfree(instance->cell_buf);
1259
1260 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1261 if (instance->urbs[i])
1262 kfree(instance->urbs[i]->transfer_buffer);
1263 usb_free_urb(instance->urbs[i]);
1264 }
1265
1266 kfree (instance);
1267
1268 return error;
1269 }
1270 EXPORT_SYMBOL_GPL(usbatm_usb_probe);
1271
1272 void usbatm_usb_disconnect(struct usb_interface *intf)
1273 {
1274 struct device *dev = &intf->dev;
1275 struct usbatm_data *instance = usb_get_intfdata(intf);
1276 struct usbatm_vcc_data *vcc_data;
1277 int i;
1278
1279 dev_dbg(dev, "%s entered\n", __func__);
1280
1281 if (!instance) {
1282 dev_dbg(dev, "%s: NULL instance!\n", __func__);
1283 return;
1284 }
1285
1286 usb_set_intfdata(intf, NULL);
1287
1288 mutex_lock(&instance->serialize);
1289 instance->disconnected = 1;
1290 if (instance->thread_pid >= 0)
1291 kill_proc(instance->thread_pid, SIGTERM, 1);
1292 mutex_unlock(&instance->serialize);
1293
1294 wait_for_completion(&instance->thread_exited);
1295
1296 mutex_lock(&instance->serialize);
1297 list_for_each_entry(vcc_data, &instance->vcc_list, list)
1298 vcc_release_async(vcc_data->vcc, -EPIPE);
1299 mutex_unlock(&instance->serialize);
1300
1301 tasklet_disable(&instance->rx_channel.tasklet);
1302 tasklet_disable(&instance->tx_channel.tasklet);
1303
1304 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
1305 usb_kill_urb(instance->urbs[i]);
1306
1307 del_timer_sync(&instance->rx_channel.delay);
1308 del_timer_sync(&instance->tx_channel.delay);
1309
1310 /* turn usbatm_[rt]x_process into something close to a no-op */
1311 /* no need to take the spinlock */
1312 INIT_LIST_HEAD(&instance->rx_channel.list);
1313 INIT_LIST_HEAD(&instance->tx_channel.list);
1314
1315 tasklet_enable(&instance->rx_channel.tasklet);
1316 tasklet_enable(&instance->tx_channel.tasklet);
1317
1318 if (instance->atm_dev && instance->driver->atm_stop)
1319 instance->driver->atm_stop(instance, instance->atm_dev);
1320
1321 if (instance->driver->unbind)
1322 instance->driver->unbind(instance, intf);
1323
1324 instance->driver_data = NULL;
1325
1326 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1327 kfree(instance->urbs[i]->transfer_buffer);
1328 usb_free_urb(instance->urbs[i]);
1329 }
1330
1331 kfree(instance->cell_buf);
1332
1333 /* ATM finalize */
1334 if (instance->atm_dev) {
1335 sysfs_remove_link(&instance->atm_dev->class_dev.kobj, "device");
1336 atm_dev_deregister(instance->atm_dev);
1337 }
1338
1339 usbatm_put_instance(instance); /* taken in usbatm_usb_probe */
1340 }
1341 EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
1342
1343
1344 /***********
1345 ** init **
1346 ***********/
1347
1348 static int __init usbatm_usb_init(void)
1349 {
1350 dbg("%s: driver version %s", __func__, DRIVER_VERSION);
1351
1352 if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) {
1353 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
1354 return -EIO;
1355 }
1356
1357 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1358 || (num_snd_urbs > UDSL_MAX_SND_URBS)
1359 || (rcv_buf_bytes < 1)
1360 || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE)
1361 || (snd_buf_bytes < 1)
1362 || (snd_buf_bytes > UDSL_MAX_BUF_SIZE))
1363 return -EINVAL;
1364
1365 return 0;
1366 }
1367 module_init(usbatm_usb_init);
1368
1369 static void __exit usbatm_usb_exit(void)
1370 {
1371 dbg("%s", __func__);
1372 }
1373 module_exit(usbatm_usb_exit);
1374
1375 MODULE_AUTHOR(DRIVER_AUTHOR);
1376 MODULE_DESCRIPTION(DRIVER_DESC);
1377 MODULE_LICENSE("GPL");
1378 MODULE_VERSION(DRIVER_VERSION);
1379
1380 /************
1381 ** debug **
1382 ************/
1383
1384 #ifdef VERBOSE_DEBUG
1385 static int usbatm_print_packet(const unsigned char *data, int len)
1386 {
1387 unsigned char buffer[256];
1388 int i = 0, j = 0;
1389
1390 for (i = 0; i < len;) {
1391 buffer[0] = '\0';
1392 sprintf(buffer, "%.3d :", i);
1393 for (j = 0; (j < 16) && (i < len); j++, i++) {
1394 sprintf(buffer, "%s %2.2x", buffer, data[i]);
1395 }
1396 dbg("%s", buffer);
1397 }
1398 return i;
1399 }
1400 #endif
linux 2.6 git repository for openrd