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