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Linux v2.6.13
[linux-2.6/next.git] / drivers / usb / atm / usbatm.c
blobbb1db19598549ee10322f9d7ff0562f4f11cad2c
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/proc_fs.h>
76 #include <linux/sched.h>
77 #include <linux/signal.h>
78 #include <linux/slab.h>
79 #include <linux/smp_lock.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 "1.9"
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_RCV_BUF_SIZE 1024 /* ATM cells */
102 #define UDSL_MAX_SND_BUF_SIZE 1024 /* ATM cells */
103 #define UDSL_DEFAULT_RCV_URBS 4
104 #define UDSL_DEFAULT_SND_URBS 4
105 #define UDSL_DEFAULT_RCV_BUF_SIZE 64 /* ATM cells */
106 #define UDSL_DEFAULT_SND_BUF_SIZE 64 /* ATM cells */
107
108 #define ATM_CELL_HEADER (ATM_CELL_SIZE - ATM_CELL_PAYLOAD)
109
110 #define THROTTLE_MSECS 100 /* delay to recover processing after urb submission fails */
111
112 static unsigned int num_rcv_urbs = UDSL_DEFAULT_RCV_URBS;
113 static unsigned int num_snd_urbs = UDSL_DEFAULT_SND_URBS;
114 static unsigned int rcv_buf_size = UDSL_DEFAULT_RCV_BUF_SIZE;
115 static unsigned int snd_buf_size = UDSL_DEFAULT_SND_BUF_SIZE;
116
117 module_param(num_rcv_urbs, uint, S_IRUGO);
118 MODULE_PARM_DESC(num_rcv_urbs,
119 "Number of urbs used for reception (range: 0-"
120 __MODULE_STRING(UDSL_MAX_RCV_URBS) ", default: "
121 __MODULE_STRING(UDSL_DEFAULT_RCV_URBS) ")");
122
123 module_param(num_snd_urbs, uint, S_IRUGO);
124 MODULE_PARM_DESC(num_snd_urbs,
125 "Number of urbs used for transmission (range: 0-"
126 __MODULE_STRING(UDSL_MAX_SND_URBS) ", default: "
127 __MODULE_STRING(UDSL_DEFAULT_SND_URBS) ")");
128
129 module_param(rcv_buf_size, uint, S_IRUGO);
130 MODULE_PARM_DESC(rcv_buf_size,
131 "Size of the buffers used for reception in ATM cells (range: 1-"
132 __MODULE_STRING(UDSL_MAX_RCV_BUF_SIZE) ", default: "
133 __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
134
135 module_param(snd_buf_size, uint, S_IRUGO);
136 MODULE_PARM_DESC(snd_buf_size,
137 "Size of the buffers used for transmission in ATM cells (range: 1-"
138 __MODULE_STRING(UDSL_MAX_SND_BUF_SIZE) ", default: "
139 __MODULE_STRING(UDSL_DEFAULT_SND_BUF_SIZE) ")");
140
141
142 /* receive */
143
144 struct usbatm_vcc_data {
145 /* vpi/vci lookup */
146 struct list_head list;
147 short vpi;
148 int vci;
149 struct atm_vcc *vcc;
150
151 /* raw cell reassembly */
152 struct sk_buff *sarb;
153 };
154
155
156 /* send */
157
158 struct usbatm_control {
159 struct atm_skb_data atm;
160 u32 len;
161 u32 crc;
162 };
163
164 #define UDSL_SKB(x) ((struct usbatm_control *)(x)->cb)
165
166
167 /* ATM */
168
169 static void usbatm_atm_dev_close(struct atm_dev *dev);
170 static int usbatm_atm_open(struct atm_vcc *vcc);
171 static void usbatm_atm_close(struct atm_vcc *vcc);
172 static int usbatm_atm_ioctl(struct atm_dev *dev, unsigned int cmd, void __user * arg);
173 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb);
174 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page);
175
176 static struct atmdev_ops usbatm_atm_devops = {
177 .dev_close = usbatm_atm_dev_close,
178 .open = usbatm_atm_open,
179 .close = usbatm_atm_close,
180 .ioctl = usbatm_atm_ioctl,
181 .send = usbatm_atm_send,
182 .proc_read = usbatm_atm_proc_read,
183 .owner = THIS_MODULE,
184 };
185
186
187 /***********
188 ** misc **
189 ***********/
190
191 static inline unsigned int usbatm_pdu_length(unsigned int length)
192 {
193 length += ATM_CELL_PAYLOAD - 1 + ATM_AAL5_TRAILER;
194 return length - length % ATM_CELL_PAYLOAD;
195 }
196
197 static inline void usbatm_pop(struct atm_vcc *vcc, struct sk_buff *skb)
198 {
199 if (vcc->pop)
200 vcc->pop(vcc, skb);
201 else
202 dev_kfree_skb(skb);
203 }
204
205
206 /***********
207 ** urbs **
208 ************/
209
210 static inline struct urb *usbatm_pop_urb(struct usbatm_channel *channel)
211 {
212 struct urb *urb;
213
214 spin_lock_irq(&channel->lock);
215 if (list_empty(&channel->list)) {
216 spin_unlock_irq(&channel->lock);
217 return NULL;
218 }
219
220 urb = list_entry(channel->list.next, struct urb, urb_list);
221 list_del(&urb->urb_list);
222 spin_unlock_irq(&channel->lock);
223
224 return urb;
225 }
226
227 static inline int usbatm_submit_urb(struct urb *urb)
228 {
229 struct usbatm_channel *channel = urb->context;
230 int ret;
231
232 vdbg("%s: submitting urb 0x%p, size %u",
233 __func__, urb, urb->transfer_buffer_length);
234
235 ret = usb_submit_urb(urb, GFP_ATOMIC);
236 if (ret) {
237 atm_dbg(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, struct pt_regs *regs)
257 {
258 struct usbatm_channel *channel = urb->context;
259 unsigned long flags;
260
261 vdbg("%s: urb 0x%p, status %d, actual_length %d",
262 __func__, urb, urb->status, urb->actual_length);
263
264 /* usually in_interrupt(), but not always */
265 spin_lock_irqsave(&channel->lock, flags);
266
267 /* must add to the back when receiving; doesn't matter when sending */
268 list_add_tail(&urb->urb_list, &channel->list);
269
270 spin_unlock_irqrestore(&channel->lock, flags);
271
272 if (unlikely(urb->status))
273 /* throttle processing in case of an error */
274 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
275 else
276 tasklet_schedule(&channel->tasklet);
277 }
278
279
280 /*************
281 ** decode **
282 *************/
283
284 static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
285 short vpi, int vci)
286 {
287 struct usbatm_vcc_data *vcc;
288
289 list_for_each_entry(vcc, &instance->vcc_list, list)
290 if ((vcc->vci == vci) && (vcc->vpi == vpi))
291 return vcc;
292 return NULL;
293 }
294
295 static void usbatm_extract_cells(struct usbatm_data *instance,
296 unsigned char *source, unsigned int avail_data)
297 {
298 struct usbatm_vcc_data *cached_vcc = NULL;
299 struct atm_vcc *vcc;
300 struct sk_buff *sarb;
301 unsigned int stride = instance->rx_channel.stride;
302 int vci, cached_vci = 0;
303 short vpi, cached_vpi = 0;
304 u8 pti;
305
306 for (; avail_data >= stride; avail_data -= stride, source += stride) {
307 vpi = ((source[0] & 0x0f) << 4) | (source[1] >> 4);
308 vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
309 pti = ((source[3] & 0xe) >> 1);
310
311 vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
312
313 if ((vci != cached_vci) || (vpi != cached_vpi)) {
314 cached_vpi = vpi;
315 cached_vci = vci;
316
317 cached_vcc = usbatm_find_vcc(instance, vpi, vci);
318
319 if (!cached_vcc)
320 atm_dbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
321 }
322
323 if (!cached_vcc)
324 continue;
325
326 vcc = cached_vcc->vcc;
327
328 /* OAM F5 end-to-end */
329 if (pti == ATM_PTI_E2EF5) {
330 atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n", __func__, vpi, vci);
331 atomic_inc(&vcc->stats->rx_err);
332 continue;
333 }
334
335 sarb = cached_vcc->sarb;
336
337 if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
338 atm_dbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
339 __func__, sarb->len, vcc);
340 /* discard cells already received */
341 skb_trim(sarb, 0);
342 UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end);
343 }
344
345 memcpy(sarb->tail, source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
346 __skb_put(sarb, ATM_CELL_PAYLOAD);
347
348 if (pti & 1) {
349 struct sk_buff *skb;
350 unsigned int length;
351 unsigned int pdu_length;
352
353 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
354
355 /* guard against overflow */
356 if (length > ATM_MAX_AAL5_PDU) {
357 atm_dbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
358 __func__, length, vcc);
359 atomic_inc(&vcc->stats->rx_err);
360 goto out;
361 }
362
363 pdu_length = usbatm_pdu_length(length);
364
365 if (sarb->len < pdu_length) {
366 atm_dbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
367 __func__, pdu_length, sarb->len, vcc);
368 atomic_inc(&vcc->stats->rx_err);
369 goto out;
370 }
371
372 if (crc32_be(~0, sarb->tail - pdu_length, pdu_length) != 0xc704dd7b) {
373 atm_dbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
374 __func__, vcc);
375 atomic_inc(&vcc->stats->rx_err);
376 goto out;
377 }
378
379 vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
380
381 if (!(skb = dev_alloc_skb(length))) {
382 atm_dbg(instance, "%s: no memory for skb (length: %u)!\n", __func__, length);
383 atomic_inc(&vcc->stats->rx_drop);
384 goto out;
385 }
386
387 vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
388
389 if (!atm_charge(vcc, skb->truesize)) {
390 atm_dbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n", __func__, skb->truesize);
391 dev_kfree_skb(skb);
392 goto out; /* atm_charge increments rx_drop */
393 }
394
395 memcpy(skb->data, sarb->tail - pdu_length, length);
396 __skb_put(skb, length);
397
398 vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
399 __func__, skb, skb->len, skb->truesize);
400
401 PACKETDEBUG(skb->data, skb->len);
402
403 vcc->push(vcc, skb);
404
405 atomic_inc(&vcc->stats->rx);
406 out:
407 skb_trim(sarb, 0);
408 }
409 }
410 }
411
412
413 /*************
414 ** encode **
415 *************/
416
417 static unsigned int usbatm_write_cells(struct usbatm_data *instance,
418 struct sk_buff *skb,
419 u8 *target, unsigned int avail_space)
420 {
421 struct usbatm_control *ctrl = UDSL_SKB(skb);
422 struct atm_vcc *vcc = ctrl->atm.vcc;
423 unsigned int num_written;
424 unsigned int stride = instance->tx_channel.stride;
425
426 vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space);
427 UDSL_ASSERT(!(avail_space % stride));
428
429 for (num_written = 0; num_written < avail_space && ctrl->len;
430 num_written += stride, target += stride) {
431 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
432 unsigned int left = ATM_CELL_PAYLOAD - data_len;
433 u8 *ptr = target;
434
435 ptr[0] = vcc->vpi >> 4;
436 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
437 ptr[2] = vcc->vci >> 4;
438 ptr[3] = vcc->vci << 4;
439 ptr[4] = 0xec;
440 ptr += ATM_CELL_HEADER;
441
442 memcpy(ptr, skb->data, data_len);
443 ptr += data_len;
444 __skb_pull(skb, data_len);
445
446 if(!left)
447 continue;
448
449 memset(ptr, 0, left);
450
451 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
452 u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
453 /* trailer[0] = 0; UU = 0 */
454 /* trailer[1] = 0; CPI = 0 */
455 trailer[2] = ctrl->len >> 8;
456 trailer[3] = ctrl->len;
457
458 ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4);
459
460 trailer[4] = ctrl->crc >> 24;
461 trailer[5] = ctrl->crc >> 16;
462 trailer[6] = ctrl->crc >> 8;
463 trailer[7] = ctrl->crc;
464
465 target[3] |= 0x2; /* adjust PTI */
466
467 ctrl->len = 0; /* tag this skb finished */
468 }
469 else
470 ctrl->crc = crc32_be(ctrl->crc, ptr, left);
471 }
472
473 return num_written;
474 }
475
476
477 /**************
478 ** receive **
479 **************/
480
481 static void usbatm_rx_process(unsigned long data)
482 {
483 struct usbatm_data *instance = (struct usbatm_data *)data;
484 struct urb *urb;
485
486 while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
487 vdbg("%s: processing urb 0x%p", __func__, urb);
488
489 if (usb_pipeisoc(urb->pipe)) {
490 int i;
491 for (i = 0; i < urb->number_of_packets; i++)
492 if (!urb->iso_frame_desc[i].status)
493 usbatm_extract_cells(instance,
494 (u8 *)urb->transfer_buffer + urb->iso_frame_desc[i].offset,
495 urb->iso_frame_desc[i].actual_length);
496 }
497 else
498 if (!urb->status)
499 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
500
501 if (usbatm_submit_urb(urb))
502 return;
503 }
504 }
505
506
507 /***********
508 ** send **
509 ***********/
510
511 static void usbatm_tx_process(unsigned long data)
512 {
513 struct usbatm_data *instance = (struct usbatm_data *)data;
514 struct sk_buff *skb = instance->current_skb;
515 struct urb *urb = NULL;
516 const unsigned int buf_size = instance->tx_channel.buf_size;
517 unsigned int num_written = 0;
518 u8 *buffer = NULL;
519
520 if (!skb)
521 skb = skb_dequeue(&instance->sndqueue);
522
523 while (skb) {
524 if (!urb) {
525 urb = usbatm_pop_urb(&instance->tx_channel);
526 if (!urb)
527 break; /* no more senders */
528 buffer = urb->transfer_buffer;
529 num_written = (urb->status == -EAGAIN) ?
530 urb->transfer_buffer_length : 0;
531 }
532
533 num_written += usbatm_write_cells(instance, skb,
534 buffer + num_written,
535 buf_size - num_written);
536
537 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p",
538 __func__, num_written, skb, urb);
539
540 if (!UDSL_SKB(skb)->len) {
541 struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
542
543 usbatm_pop(vcc, skb);
544 atomic_inc(&vcc->stats->tx);
545
546 skb = skb_dequeue(&instance->sndqueue);
547 }
548
549 if (num_written == buf_size || (!skb && num_written)) {
550 urb->transfer_buffer_length = num_written;
551
552 if (usbatm_submit_urb(urb))
553 break;
554 urb = NULL;
555 }
556 }
557
558 instance->current_skb = skb;
559 }
560
561 static void usbatm_cancel_send(struct usbatm_data *instance,
562 struct atm_vcc *vcc)
563 {
564 struct sk_buff *skb, *n;
565
566 atm_dbg(instance, "%s entered\n", __func__);
567 spin_lock_irq(&instance->sndqueue.lock);
568 for (skb = instance->sndqueue.next, n = skb->next;
569 skb != (struct sk_buff *)&instance->sndqueue;
570 skb = n, n = skb->next)
571 if (UDSL_SKB(skb)->atm.vcc == vcc) {
572 atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
573 __skb_unlink(skb, &instance->sndqueue);
574 usbatm_pop(vcc, skb);
575 }
576 spin_unlock_irq(&instance->sndqueue.lock);
577
578 tasklet_disable(&instance->tx_channel.tasklet);
579 if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
580 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
581 instance->current_skb = NULL;
582 usbatm_pop(vcc, skb);
583 }
584 tasklet_enable(&instance->tx_channel.tasklet);
585 atm_dbg(instance, "%s done\n", __func__);
586 }
587
588 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
589 {
590 struct usbatm_data *instance = vcc->dev->dev_data;
591 struct usbatm_control *ctrl = UDSL_SKB(skb);
592 int err;
593
594 vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);
595
596 if (!instance) {
597 dbg("%s: NULL data!", __func__);
598 err = -ENODEV;
599 goto fail;
600 }
601
602 if (vcc->qos.aal != ATM_AAL5) {
603 atm_dbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
604 err = -EINVAL;
605 goto fail;
606 }
607
608 if (skb->len > ATM_MAX_AAL5_PDU) {
609 atm_dbg(instance, "%s: packet too long (%d vs %d)!\n",
610 __func__, skb->len, ATM_MAX_AAL5_PDU);
611 err = -EINVAL;
612 goto fail;
613 }
614
615 PACKETDEBUG(skb->data, skb->len);
616
617 /* initialize the control block */
618 ctrl->atm.vcc = vcc;
619 ctrl->len = skb->len;
620 ctrl->crc = crc32_be(~0, skb->data, skb->len);
621
622 skb_queue_tail(&instance->sndqueue, skb);
623 tasklet_schedule(&instance->tx_channel.tasklet);
624
625 return 0;
626
627 fail:
628 usbatm_pop(vcc, skb);
629 return err;
630 }
631
632
633 /********************
634 ** bean counting **
635 ********************/
636
637 static void usbatm_destroy_instance(struct kref *kref)
638 {
639 struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
640
641 dbg("%s", __func__);
642
643 tasklet_kill(&instance->rx_channel.tasklet);
644 tasklet_kill(&instance->tx_channel.tasklet);
645 usb_put_dev(instance->usb_dev);
646 kfree(instance);
647 }
648
649 void usbatm_get_instance(struct usbatm_data *instance)
650 {
651 dbg("%s", __func__);
652
653 kref_get(&instance->refcount);
654 }
655
656 void usbatm_put_instance(struct usbatm_data *instance)
657 {
658 dbg("%s", __func__);
659
660 kref_put(&instance->refcount, usbatm_destroy_instance);
661 }
662
663
664 /**********
665 ** ATM **
666 **********/
667
668 static void usbatm_atm_dev_close(struct atm_dev *dev)
669 {
670 struct usbatm_data *instance = dev->dev_data;
671
672 dbg("%s", __func__);
673
674 if (!instance)
675 return;
676
677 dev->dev_data = NULL;
678 usbatm_put_instance(instance); /* taken in usbatm_atm_init */
679 }
680
681 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
682 {
683 struct usbatm_data *instance = atm_dev->dev_data;
684 int left = *pos;
685
686 if (!instance) {
687 dbg("%s: NULL instance!", __func__);
688 return -ENODEV;
689 }
690
691 if (!left--)
692 return sprintf(page, "%s\n", instance->description);
693
694 if (!left--)
695 return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
696 atm_dev->esi[0], atm_dev->esi[1],
697 atm_dev->esi[2], atm_dev->esi[3],
698 atm_dev->esi[4], atm_dev->esi[5]);
699
700 if (!left--)
701 return sprintf(page,
702 "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
703 atomic_read(&atm_dev->stats.aal5.tx),
704 atomic_read(&atm_dev->stats.aal5.tx_err),
705 atomic_read(&atm_dev->stats.aal5.rx),
706 atomic_read(&atm_dev->stats.aal5.rx_err),
707 atomic_read(&atm_dev->stats.aal5.rx_drop));
708
709 if (!left--)
710 switch (atm_dev->signal) {
711 case ATM_PHY_SIG_FOUND:
712 return sprintf(page, "Line up\n");
713 case ATM_PHY_SIG_LOST:
714 return sprintf(page, "Line down\n");
715 default:
716 return sprintf(page, "Line state unknown\n");
717 }
718
719 return 0;
720 }
721
722 static int usbatm_atm_open(struct atm_vcc *vcc)
723 {
724 struct usbatm_data *instance = vcc->dev->dev_data;
725 struct usbatm_vcc_data *new = NULL;
726 int ret;
727 int vci = vcc->vci;
728 short vpi = vcc->vpi;
729
730 if (!instance) {
731 dbg("%s: NULL data!", __func__);
732 return -ENODEV;
733 }
734
735 atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci);
736
737 /* only support AAL5 */
738 if ((vcc->qos.aal != ATM_AAL5) || (vcc->qos.rxtp.max_sdu < 0)
739 || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
740 atm_dbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
741 return -EINVAL;
742 }
743
744 down(&instance->serialize); /* vs self, usbatm_atm_close */
745
746 if (usbatm_find_vcc(instance, vpi, vci)) {
747 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
748 ret = -EADDRINUSE;
749 goto fail;
750 }
751
752 if (!(new = kmalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) {
753 atm_dbg(instance, "%s: no memory for vcc_data!\n", __func__);
754 ret = -ENOMEM;
755 goto fail;
756 }
757
758 memset(new, 0, sizeof(struct usbatm_vcc_data));
759 new->vcc = vcc;
760 new->vpi = vpi;
761 new->vci = vci;
762
763 new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
764 if (!new->sarb) {
765 atm_dbg(instance, "%s: no memory for SAR buffer!\n", __func__);
766 ret = -ENOMEM;
767 goto fail;
768 }
769
770 vcc->dev_data = new;
771
772 tasklet_disable(&instance->rx_channel.tasklet);
773 list_add(&new->list, &instance->vcc_list);
774 tasklet_enable(&instance->rx_channel.tasklet);
775
776 set_bit(ATM_VF_ADDR, &vcc->flags);
777 set_bit(ATM_VF_PARTIAL, &vcc->flags);
778 set_bit(ATM_VF_READY, &vcc->flags);
779
780 up(&instance->serialize);
781
782 atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
783
784 return 0;
785
786 fail:
787 kfree(new);
788 up(&instance->serialize);
789 return ret;
790 }
791
792 static void usbatm_atm_close(struct atm_vcc *vcc)
793 {
794 struct usbatm_data *instance = vcc->dev->dev_data;
795 struct usbatm_vcc_data *vcc_data = vcc->dev_data;
796
797 if (!instance || !vcc_data) {
798 dbg("%s: NULL data!", __func__);
799 return;
800 }
801
802 atm_dbg(instance, "%s entered\n", __func__);
803
804 atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n",
805 __func__, vcc_data, vcc_data->vpi, vcc_data->vci);
806
807 usbatm_cancel_send(instance, vcc);
808
809 down(&instance->serialize); /* vs self, usbatm_atm_open */
810
811 tasklet_disable(&instance->rx_channel.tasklet);
812 list_del(&vcc_data->list);
813 tasklet_enable(&instance->rx_channel.tasklet);
814
815 kfree_skb(vcc_data->sarb);
816 vcc_data->sarb = NULL;
817
818 kfree(vcc_data);
819 vcc->dev_data = NULL;
820
821 vcc->vpi = ATM_VPI_UNSPEC;
822 vcc->vci = ATM_VCI_UNSPEC;
823 clear_bit(ATM_VF_READY, &vcc->flags);
824 clear_bit(ATM_VF_PARTIAL, &vcc->flags);
825 clear_bit(ATM_VF_ADDR, &vcc->flags);
826
827 up(&instance->serialize);
828
829 atm_dbg(instance, "%s successful\n", __func__);
830 }
831
832 static int usbatm_atm_ioctl(struct atm_dev *dev, unsigned int cmd,
833 void __user * arg)
834 {
835 switch (cmd) {
836 case ATM_QUERYLOOP:
837 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
838 default:
839 return -ENOIOCTLCMD;
840 }
841 }
842
843 static int usbatm_atm_init(struct usbatm_data *instance)
844 {
845 struct atm_dev *atm_dev;
846 int ret, i;
847
848 /* ATM init */
849 atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL);
850 if (!atm_dev) {
851 usb_dbg(instance, "%s: failed to register ATM device!\n", __func__);
852 return -1;
853 }
854
855 instance->atm_dev = atm_dev;
856
857 atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
858 atm_dev->ci_range.vci_bits = ATM_CI_MAX;
859 atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
860
861 /* temp init ATM device, set to 128kbit */
862 atm_dev->link_rate = 128 * 1000 / 424;
863
864 if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
865 atm_dbg(instance, "%s: atm_start failed: %d!\n", __func__, ret);
866 goto fail;
867 }
868
869 /* ready for ATM callbacks */
870 usbatm_get_instance(instance); /* dropped in usbatm_atm_dev_close */
871 mb();
872 atm_dev->dev_data = instance;
873
874 /* submit all rx URBs */
875 for (i = 0; i < num_rcv_urbs; i++)
876 usbatm_submit_urb(instance->urbs[i]);
877
878 return 0;
879
880 fail:
881 instance->atm_dev = NULL;
882 shutdown_atm_dev(atm_dev); /* usbatm_atm_dev_close will eventually be called */
883 return ret;
884 }
885
886
887 /**********
888 ** USB **
889 **********/
890
891 static int usbatm_do_heavy_init(void *arg)
892 {
893 struct usbatm_data *instance = arg;
894 int ret;
895
896 daemonize(instance->driver->driver_name);
897 allow_signal(SIGTERM);
898
899 complete(&instance->thread_started);
900
901 ret = instance->driver->heavy_init(instance, instance->usb_intf);
902
903 if (!ret)
904 ret = usbatm_atm_init(instance);
905
906 down(&instance->serialize);
907 instance->thread_pid = -1;
908 up(&instance->serialize);
909
910 complete_and_exit(&instance->thread_exited, ret);
911 }
912
913 static int usbatm_heavy_init(struct usbatm_data *instance)
914 {
915 int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_KERNEL);
916
917 if (ret < 0) {
918 usb_dbg(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret);
919 return ret;
920 }
921
922 down(&instance->serialize);
923 instance->thread_pid = ret;
924 up(&instance->serialize);
925
926 wait_for_completion(&instance->thread_started);
927
928 return 0;
929 }
930
931 static void usbatm_tasklet_schedule(unsigned long data)
932 {
933 tasklet_schedule((struct tasklet_struct *) data);
934 }
935
936 static inline void usbatm_init_channel(struct usbatm_channel *channel)
937 {
938 spin_lock_init(&channel->lock);
939 INIT_LIST_HEAD(&channel->list);
940 channel->delay.function = usbatm_tasklet_schedule;
941 channel->delay.data = (unsigned long) &channel->tasklet;
942 init_timer(&channel->delay);
943 }
944
945 int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
946 struct usbatm_driver *driver)
947 {
948 struct device *dev = &intf->dev;
949 struct usb_device *usb_dev = interface_to_usbdev(intf);
950 struct usbatm_data *instance;
951 char *buf;
952 int error = -ENOMEM;
953 int i, length;
954 int need_heavy;
955
956 dev_dbg(dev, "%s: trying driver %s with vendor=0x%x, product=0x%x, ifnum %d\n",
957 __func__, driver->driver_name,
958 le16_to_cpu(usb_dev->descriptor.idVendor),
959 le16_to_cpu(usb_dev->descriptor.idProduct),
960 intf->altsetting->desc.bInterfaceNumber);
961
962 /* instance init */
963 instance = kcalloc(1, sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
964 if (!instance) {
965 dev_dbg(dev, "%s: no memory for instance data!\n", __func__);
966 return -ENOMEM;
967 }
968
969 /* public fields */
970
971 instance->driver = driver;
972 snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name);
973
974 instance->usb_dev = usb_dev;
975 instance->usb_intf = intf;
976
977 buf = instance->description;
978 length = sizeof(instance->description);
979
980 if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
981 goto bind;
982
983 buf += i;
984 length -= i;
985
986 i = scnprintf(buf, length, " (");
987 buf += i;
988 length -= i;
989
990 if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
991 goto bind;
992
993 buf += i;
994 length -= i;
995
996 snprintf(buf, length, ")");
997
998 bind:
999 need_heavy = 1;
1000 if (driver->bind && (error = driver->bind(instance, intf, id, &need_heavy)) < 0) {
1001 dev_dbg(dev, "%s: bind failed: %d!\n", __func__, error);
1002 goto fail_free;
1003 }
1004
1005 /* private fields */
1006
1007 kref_init(&instance->refcount); /* dropped in usbatm_usb_disconnect */
1008 init_MUTEX(&instance->serialize);
1009
1010 instance->thread_pid = -1;
1011 init_completion(&instance->thread_started);
1012 init_completion(&instance->thread_exited);
1013
1014 INIT_LIST_HEAD(&instance->vcc_list);
1015
1016 usbatm_init_channel(&instance->rx_channel);
1017 usbatm_init_channel(&instance->tx_channel);
1018 tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
1019 tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
1020 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->in);
1021 instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->out);
1022 instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
1023 instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
1024 instance->rx_channel.buf_size = rcv_buf_size * instance->rx_channel.stride;
1025 instance->tx_channel.buf_size = snd_buf_size * instance->tx_channel.stride;
1026 instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
1027
1028 skb_queue_head_init(&instance->sndqueue);
1029
1030 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1031 struct urb *urb;
1032 u8 *buffer;
1033 unsigned int iso_packets = 0, iso_size = 0;
1034 struct usbatm_channel *channel = i < num_rcv_urbs ?
1035 &instance->rx_channel : &instance->tx_channel;
1036
1037 if (usb_pipeisoc(channel->endpoint)) {
1038 /* don't expect iso out endpoints */
1039 iso_size = usb_maxpacket(instance->usb_dev, channel->endpoint, 0);
1040 iso_size -= iso_size % channel->stride; /* alignment */
1041 BUG_ON(!iso_size);
1042 iso_packets = (channel->buf_size - 1) / iso_size + 1;
1043 }
1044
1045 urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
1046 if (!urb) {
1047 dev_dbg(dev, "%s: no memory for urb %d!\n", __func__, i);
1048 goto fail_unbind;
1049 }
1050
1051 instance->urbs[i] = urb;
1052
1053 buffer = kmalloc(channel->buf_size, GFP_KERNEL);
1054 if (!buffer) {
1055 dev_dbg(dev, "%s: no memory for buffer %d!\n", __func__, i);
1056 goto fail_unbind;
1057 }
1058 memset(buffer, 0, channel->buf_size);
1059
1060 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
1061 buffer, channel->buf_size, usbatm_complete, channel);
1062 if (iso_packets) {
1063 int j;
1064 urb->interval = 1;
1065 urb->transfer_flags = URB_ISO_ASAP;
1066 urb->number_of_packets = iso_packets;
1067 for (j = 0; j < iso_packets; j++) {
1068 urb->iso_frame_desc[j].offset = iso_size * j;
1069 urb->iso_frame_desc[j].length = min_t(int, iso_size,
1070 channel->buf_size - urb->iso_frame_desc[j].offset);
1071 }
1072 }
1073
1074 /* put all tx URBs on the list of spares */
1075 if (i >= num_rcv_urbs)
1076 list_add_tail(&urb->urb_list, &channel->list);
1077
1078 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p",
1079 __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
1080 }
1081
1082 if (need_heavy && driver->heavy_init) {
1083 error = usbatm_heavy_init(instance);
1084 } else {
1085 complete(&instance->thread_exited); /* pretend that heavy_init was run */
1086 error = usbatm_atm_init(instance);
1087 }
1088
1089 if (error < 0)
1090 goto fail_unbind;
1091
1092 usb_get_dev(usb_dev);
1093 usb_set_intfdata(intf, instance);
1094
1095 return 0;
1096
1097 fail_unbind:
1098 if (instance->driver->unbind)
1099 instance->driver->unbind(instance, intf);
1100 fail_free:
1101 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1102 if (instance->urbs[i])
1103 kfree(instance->urbs[i]->transfer_buffer);
1104 usb_free_urb(instance->urbs[i]);
1105 }
1106
1107 kfree (instance);
1108
1109 return error;
1110 }
1111 EXPORT_SYMBOL_GPL(usbatm_usb_probe);
1112
1113 void usbatm_usb_disconnect(struct usb_interface *intf)
1114 {
1115 struct device *dev = &intf->dev;
1116 struct usbatm_data *instance = usb_get_intfdata(intf);
1117 int i;
1118
1119 dev_dbg(dev, "%s entered\n", __func__);
1120
1121 if (!instance) {
1122 dev_dbg(dev, "%s: NULL instance!\n", __func__);
1123 return;
1124 }
1125
1126 usb_set_intfdata(intf, NULL);
1127
1128 down(&instance->serialize);
1129 if (instance->thread_pid >= 0)
1130 kill_proc(instance->thread_pid, SIGTERM, 1);
1131 up(&instance->serialize);
1132
1133 wait_for_completion(&instance->thread_exited);
1134
1135 tasklet_disable(&instance->rx_channel.tasklet);
1136 tasklet_disable(&instance->tx_channel.tasklet);
1137
1138 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
1139 usb_kill_urb(instance->urbs[i]);
1140
1141 del_timer_sync(&instance->rx_channel.delay);
1142 del_timer_sync(&instance->tx_channel.delay);
1143
1144 if (instance->atm_dev && instance->driver->atm_stop)
1145 instance->driver->atm_stop(instance, instance->atm_dev);
1146
1147 if (instance->driver->unbind)
1148 instance->driver->unbind(instance, intf);
1149
1150 instance->driver_data = NULL;
1151
1152 /* turn usbatm_[rt]x_process into noop */
1153 /* no need to take the spinlock */
1154 INIT_LIST_HEAD(&instance->rx_channel.list);
1155 INIT_LIST_HEAD(&instance->tx_channel.list);
1156
1157 tasklet_enable(&instance->rx_channel.tasklet);
1158 tasklet_enable(&instance->tx_channel.tasklet);
1159
1160 for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1161 kfree(instance->urbs[i]->transfer_buffer);
1162 usb_free_urb(instance->urbs[i]);
1163 }
1164
1165 /* ATM finalize */
1166 if (instance->atm_dev)
1167 shutdown_atm_dev(instance->atm_dev);
1168
1169 usbatm_put_instance(instance); /* taken in usbatm_usb_probe */
1170 }
1171 EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
1172
1173
1174 /***********
1175 ** init **
1176 ***********/
1177
1178 static int __init usbatm_usb_init(void)
1179 {
1180 dbg("%s: driver version %s", __func__, DRIVER_VERSION);
1181
1182 if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) {
1183 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
1184 return -EIO;
1185 }
1186
1187 if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1188 || (num_snd_urbs > UDSL_MAX_SND_URBS)
1189 || (rcv_buf_size < 1)
1190 || (rcv_buf_size > UDSL_MAX_RCV_BUF_SIZE)
1191 || (snd_buf_size < 1)
1192 || (snd_buf_size > UDSL_MAX_SND_BUF_SIZE))
1193 return -EINVAL;
1194
1195 return 0;
1196 }
1197 module_init(usbatm_usb_init);
1198
1199 static void __exit usbatm_usb_exit(void)
1200 {
1201 dbg("%s", __func__);
1202 }
1203 module_exit(usbatm_usb_exit);
1204
1205 MODULE_AUTHOR(DRIVER_AUTHOR);
1206 MODULE_DESCRIPTION(DRIVER_DESC);
1207 MODULE_LICENSE("GPL");
1208 MODULE_VERSION(DRIVER_VERSION);
1209
1210 /************
1211 ** debug **
1212 ************/
1213
1214 #ifdef VERBOSE_DEBUG
1215 static int usbatm_print_packet(const unsigned char *data, int len)
1216 {
1217 unsigned char buffer[256];
1218 int i = 0, j = 0;
1219
1220 for (i = 0; i < len;) {
1221 buffer[0] = '\0';
1222 sprintf(buffer, "%.3d :", i);
1223 for (j = 0; (j < 16) && (i < len); j++, i++) {
1224 sprintf(buffer, "%s %2.2x", buffer, data[i]);
1225 }
1226 dbg("%s", buffer);
1227 }
1228 return i;
1229 }
1230 #endif
linux-next