Merge branch 'master' into upstream
[linux-2.6] / drivers / usb / atm / usbatm.c
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/smp_lock.h>
81 #include <linux/stat.h>
82 #include <linux/timer.h>
83 #include <linux/wait.h>
84
85 #ifdef VERBOSE_DEBUG
86 static int usbatm_print_packet(const unsigned char *data, int len);
87 #define PACKETDEBUG(arg...)     usbatm_print_packet (arg)
88 #define vdbg(arg...)            dbg (arg)
89 #else
90 #define PACKETDEBUG(arg...)
91 #define vdbg(arg...)
92 #endif
93
94 #define DRIVER_AUTHOR   "Johan Verrept, Duncan Sands <duncan.sands@free.fr>"
95 #define DRIVER_VERSION  "1.10"
96 #define DRIVER_DESC     "Generic USB ATM/DSL I/O, version " DRIVER_VERSION
97
98 static const char usbatm_driver_name[] = "usbatm";
99
100 #define UDSL_MAX_RCV_URBS               16
101 #define UDSL_MAX_SND_URBS               16
102 #define UDSL_MAX_BUF_SIZE               65536
103 #define UDSL_DEFAULT_RCV_URBS           4
104 #define UDSL_DEFAULT_SND_URBS           4
105 #define UDSL_DEFAULT_RCV_BUF_SIZE       3392    /* 64 * ATM_CELL_SIZE */
106 #define UDSL_DEFAULT_SND_BUF_SIZE       3392    /* 64 * ATM_CELL_SIZE */
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_bytes = UDSL_DEFAULT_RCV_BUF_SIZE;
115 static unsigned int snd_buf_bytes = 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_bytes, uint, S_IRUGO);
130 MODULE_PARM_DESC(rcv_buf_bytes,
131                  "Size of the buffers used for reception, in bytes (range: 1-"
132                  __MODULE_STRING(UDSL_MAX_BUF_SIZE) ", default: "
133                  __MODULE_STRING(UDSL_DEFAULT_RCV_BUF_SIZE) ")");
134
135 module_param(snd_buf_bytes, uint, S_IRUGO);
136 MODULE_PARM_DESC(snd_buf_bytes,
137                  "Size of the buffers used for transmission, in bytes (range: 1-"
138                  __MODULE_STRING(UDSL_MAX_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 *atm_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 *atm_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_any(skb);
203 }
204
205
206 /***********
207 **  urbs  **
208 ************/
209
210 static 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 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                 if (printk_ratelimit())
238                         atm_warn(channel->usbatm, "%s: urb 0x%p submission failed (%d)!\n",
239                                 __func__, urb, ret);
240
241                 /* consider all errors transient and return the buffer back to the queue */
242                 urb->status = -EAGAIN;
243                 spin_lock_irq(&channel->lock);
244
245                 /* must add to the front when sending; doesn't matter when receiving */
246                 list_add(&urb->urb_list, &channel->list);
247
248                 spin_unlock_irq(&channel->lock);
249
250                 /* make sure the channel doesn't stall */
251                 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
252         }
253
254         return ret;
255 }
256
257 static void usbatm_complete(struct urb *urb, struct pt_regs *regs)
258 {
259         struct usbatm_channel *channel = urb->context;
260         unsigned long flags;
261
262         vdbg("%s: urb 0x%p, status %d, actual_length %d",
263              __func__, urb, urb->status, urb->actual_length);
264
265         /* usually in_interrupt(), but not always */
266         spin_lock_irqsave(&channel->lock, flags);
267
268         /* must add to the back when receiving; doesn't matter when sending */
269         list_add_tail(&urb->urb_list, &channel->list);
270
271         spin_unlock_irqrestore(&channel->lock, flags);
272
273         if (unlikely(urb->status) &&
274                         (!(channel->usbatm->flags & UDSL_IGNORE_EILSEQ) ||
275                          urb->status != -EILSEQ ))
276         {
277                 if (printk_ratelimit())
278                         atm_warn(channel->usbatm, "%s: urb 0x%p failed (%d)!\n",
279                                 __func__, urb, urb->status);
280                 /* throttle processing in case of an error */
281                 mod_timer(&channel->delay, jiffies + msecs_to_jiffies(THROTTLE_MSECS));
282         } else
283                 tasklet_schedule(&channel->tasklet);
284 }
285
286
287 /*************
288 **  decode  **
289 *************/
290
291 static inline struct usbatm_vcc_data *usbatm_find_vcc(struct usbatm_data *instance,
292                                                   short vpi, int vci)
293 {
294         struct usbatm_vcc_data *vcc_data;
295
296         list_for_each_entry(vcc_data, &instance->vcc_list, list)
297                 if ((vcc_data->vci == vci) && (vcc_data->vpi == vpi))
298                         return vcc_data;
299         return NULL;
300 }
301
302 static void usbatm_extract_one_cell(struct usbatm_data *instance, unsigned char *source)
303 {
304         struct atm_vcc *vcc;
305         struct sk_buff *sarb;
306         short vpi = ((source[0] & 0x0f) << 4)  | (source[1] >> 4);
307         int vci = ((source[1] & 0x0f) << 12) | (source[2] << 4) | (source[3] >> 4);
308         u8 pti = ((source[3] & 0xe) >> 1);
309
310         vdbg("%s: vpi %hd, vci %d, pti %d", __func__, vpi, vci, pti);
311
312         if ((vci != instance->cached_vci) || (vpi != instance->cached_vpi)) {
313                 instance->cached_vpi = vpi;
314                 instance->cached_vci = vci;
315
316                 instance->cached_vcc = usbatm_find_vcc(instance, vpi, vci);
317
318                 if (!instance->cached_vcc)
319                         atm_rldbg(instance, "%s: unknown vpi/vci (%hd/%d)!\n", __func__, vpi, vci);
320         }
321
322         if (!instance->cached_vcc)
323                 return;
324
325         vcc = instance->cached_vcc->vcc;
326
327         /* OAM F5 end-to-end */
328         if (pti == ATM_PTI_E2EF5) {
329                 if (printk_ratelimit())
330                         atm_warn(instance, "%s: OAM not supported (vpi %d, vci %d)!\n",
331                                 __func__, vpi, vci);
332                 atomic_inc(&vcc->stats->rx_err);
333                 return;
334         }
335
336         sarb = instance->cached_vcc->sarb;
337
338         if (sarb->tail + ATM_CELL_PAYLOAD > sarb->end) {
339                 atm_rldbg(instance, "%s: buffer overrun (sarb->len %u, vcc: 0x%p)!\n",
340                                 __func__, sarb->len, vcc);
341                 /* discard cells already received */
342                 skb_trim(sarb, 0);
343                 UDSL_ASSERT(sarb->tail + ATM_CELL_PAYLOAD <= sarb->end);
344         }
345
346         memcpy(sarb->tail, source + ATM_CELL_HEADER, ATM_CELL_PAYLOAD);
347         __skb_put(sarb, ATM_CELL_PAYLOAD);
348
349         if (pti & 1) {
350                 struct sk_buff *skb;
351                 unsigned int length;
352                 unsigned int pdu_length;
353
354                 length = (source[ATM_CELL_SIZE - 6] << 8) + source[ATM_CELL_SIZE - 5];
355
356                 /* guard against overflow */
357                 if (length > ATM_MAX_AAL5_PDU) {
358                         atm_rldbg(instance, "%s: bogus length %u (vcc: 0x%p)!\n",
359                                   __func__, length, vcc);
360                         atomic_inc(&vcc->stats->rx_err);
361                         goto out;
362                 }
363
364                 pdu_length = usbatm_pdu_length(length);
365
366                 if (sarb->len < pdu_length) {
367                         atm_rldbg(instance, "%s: bogus pdu_length %u (sarb->len: %u, vcc: 0x%p)!\n",
368                                   __func__, pdu_length, sarb->len, vcc);
369                         atomic_inc(&vcc->stats->rx_err);
370                         goto out;
371                 }
372
373                 if (crc32_be(~0, sarb->tail - pdu_length, pdu_length) != 0xc704dd7b) {
374                         atm_rldbg(instance, "%s: packet failed crc check (vcc: 0x%p)!\n",
375                                   __func__, vcc);
376                         atomic_inc(&vcc->stats->rx_err);
377                         goto out;
378                 }
379
380                 vdbg("%s: got packet (length: %u, pdu_length: %u, vcc: 0x%p)", __func__, length, pdu_length, vcc);
381
382                 if (!(skb = dev_alloc_skb(length))) {
383                         if (printk_ratelimit())
384                                 atm_err(instance, "%s: no memory for skb (length: %u)!\n",
385                                         __func__, length);
386                         atomic_inc(&vcc->stats->rx_drop);
387                         goto out;
388                 }
389
390                 vdbg("%s: allocated new sk_buff (skb: 0x%p, skb->truesize: %u)", __func__, skb, skb->truesize);
391
392                 if (!atm_charge(vcc, skb->truesize)) {
393                         atm_rldbg(instance, "%s: failed atm_charge (skb->truesize: %u)!\n",
394                                   __func__, skb->truesize);
395                         dev_kfree_skb_any(skb);
396                         goto out;       /* atm_charge increments rx_drop */
397                 }
398
399                 memcpy(skb->data, sarb->tail - pdu_length, length);
400                 __skb_put(skb, length);
401
402                 vdbg("%s: sending skb 0x%p, skb->len %u, skb->truesize %u",
403                      __func__, skb, skb->len, skb->truesize);
404
405                 PACKETDEBUG(skb->data, skb->len);
406
407                 vcc->push(vcc, skb);
408
409                 atomic_inc(&vcc->stats->rx);
410         out:
411                 skb_trim(sarb, 0);
412         }
413 }
414
415 static void usbatm_extract_cells(struct usbatm_data *instance,
416                 unsigned char *source, unsigned int avail_data)
417 {
418         unsigned int stride = instance->rx_channel.stride;
419         unsigned int buf_usage = instance->buf_usage;
420
421         /* extract cells from incoming data, taking into account that
422          * the length of avail data may not be a multiple of stride */
423
424         if (buf_usage > 0) {
425                 /* we have a partially received atm cell */
426                 unsigned char *cell_buf = instance->cell_buf;
427                 unsigned int space_left = stride - buf_usage;
428
429                 UDSL_ASSERT(buf_usage <= stride);
430
431                 if (avail_data >= space_left) {
432                         /* add new data and process cell */
433                         memcpy(cell_buf + buf_usage, source, space_left);
434                         source += space_left;
435                         avail_data -= space_left;
436                         usbatm_extract_one_cell(instance, cell_buf);
437                         instance->buf_usage = 0;
438                 } else {
439                         /* not enough data to fill the cell */
440                         memcpy(cell_buf + buf_usage, source, avail_data);
441                         instance->buf_usage = buf_usage + avail_data;
442                         return;
443                 }
444         }
445
446         for (; avail_data >= stride; avail_data -= stride, source += stride)
447                 usbatm_extract_one_cell(instance, source);
448
449         if (avail_data > 0) {
450                 /* length was not a multiple of stride -
451                  * save remaining data for next call */
452                 memcpy(instance->cell_buf, source, avail_data);
453                 instance->buf_usage = avail_data;
454         }
455 }
456
457
458 /*************
459 **  encode  **
460 *************/
461
462 static unsigned int usbatm_write_cells(struct usbatm_data *instance,
463                                        struct sk_buff *skb,
464                                        u8 *target, unsigned int avail_space)
465 {
466         struct usbatm_control *ctrl = UDSL_SKB(skb);
467         struct atm_vcc *vcc = ctrl->atm.vcc;
468         unsigned int bytes_written;
469         unsigned int stride = instance->tx_channel.stride;
470
471         vdbg("%s: skb->len=%d, avail_space=%u", __func__, skb->len, avail_space);
472         UDSL_ASSERT(!(avail_space % stride));
473
474         for (bytes_written = 0; bytes_written < avail_space && ctrl->len;
475              bytes_written += stride, target += stride) {
476                 unsigned int data_len = min_t(unsigned int, skb->len, ATM_CELL_PAYLOAD);
477                 unsigned int left = ATM_CELL_PAYLOAD - data_len;
478                 u8 *ptr = target;
479
480                 ptr[0] = vcc->vpi >> 4;
481                 ptr[1] = (vcc->vpi << 4) | (vcc->vci >> 12);
482                 ptr[2] = vcc->vci >> 4;
483                 ptr[3] = vcc->vci << 4;
484                 ptr[4] = 0xec;
485                 ptr += ATM_CELL_HEADER;
486
487                 memcpy(ptr, skb->data, data_len);
488                 ptr += data_len;
489                 __skb_pull(skb, data_len);
490
491                 if(!left)
492                         continue;
493
494                 memset(ptr, 0, left);
495
496                 if (left >= ATM_AAL5_TRAILER) { /* trailer will go in this cell */
497                         u8 *trailer = target + ATM_CELL_SIZE - ATM_AAL5_TRAILER;
498                         /* trailer[0] = 0;              UU = 0 */
499                         /* trailer[1] = 0;              CPI = 0 */
500                         trailer[2] = ctrl->len >> 8;
501                         trailer[3] = ctrl->len;
502
503                         ctrl->crc = ~ crc32_be(ctrl->crc, ptr, left - 4);
504
505                         trailer[4] = ctrl->crc >> 24;
506                         trailer[5] = ctrl->crc >> 16;
507                         trailer[6] = ctrl->crc >> 8;
508                         trailer[7] = ctrl->crc;
509
510                         target[3] |= 0x2;       /* adjust PTI */
511
512                         ctrl->len = 0;          /* tag this skb finished */
513                 }
514                 else
515                         ctrl->crc = crc32_be(ctrl->crc, ptr, left);
516         }
517
518         return bytes_written;
519 }
520
521
522 /**************
523 **  receive  **
524 **************/
525
526 static void usbatm_rx_process(unsigned long data)
527 {
528         struct usbatm_data *instance = (struct usbatm_data *)data;
529         struct urb *urb;
530
531         while ((urb = usbatm_pop_urb(&instance->rx_channel))) {
532                 vdbg("%s: processing urb 0x%p", __func__, urb);
533
534                 if (usb_pipeisoc(urb->pipe)) {
535                         unsigned char *merge_start = NULL;
536                         unsigned int merge_length = 0;
537                         const unsigned int packet_size = instance->rx_channel.packet_size;
538                         int i;
539
540                         for (i = 0; i < urb->number_of_packets; i++) {
541                                 if (!urb->iso_frame_desc[i].status) {
542                                         unsigned int actual_length = urb->iso_frame_desc[i].actual_length;
543
544                                         UDSL_ASSERT(actual_length <= packet_size);
545
546                                         if (!merge_length)
547                                                 merge_start = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
548                                         merge_length += actual_length;
549                                         if (merge_length && (actual_length < packet_size)) {
550                                                 usbatm_extract_cells(instance, merge_start, merge_length);
551                                                 merge_length = 0;
552                                         }
553                                 } else {
554                                         atm_rldbg(instance, "%s: status %d in frame %d!\n", __func__, urb->status, i);
555                                         if (merge_length)
556                                                 usbatm_extract_cells(instance, merge_start, merge_length);
557                                         merge_length = 0;
558                                         instance->buf_usage = 0;
559                                 }
560                         }
561
562                         if (merge_length)
563                                 usbatm_extract_cells(instance, merge_start, merge_length);
564                 } else
565                         if (!urb->status)
566                                 usbatm_extract_cells(instance, urb->transfer_buffer, urb->actual_length);
567                         else
568                                 instance->buf_usage = 0;
569
570                 if (usbatm_submit_urb(urb))
571                         return;
572         }
573 }
574
575
576 /***********
577 **  send  **
578 ***********/
579
580 static void usbatm_tx_process(unsigned long data)
581 {
582         struct usbatm_data *instance = (struct usbatm_data *)data;
583         struct sk_buff *skb = instance->current_skb;
584         struct urb *urb = NULL;
585         const unsigned int buf_size = instance->tx_channel.buf_size;
586         unsigned int bytes_written = 0;
587         u8 *buffer = NULL;
588
589         if (!skb)
590                 skb = skb_dequeue(&instance->sndqueue);
591
592         while (skb) {
593                 if (!urb) {
594                         urb = usbatm_pop_urb(&instance->tx_channel);
595                         if (!urb)
596                                 break;          /* no more senders */
597                         buffer = urb->transfer_buffer;
598                         bytes_written = (urb->status == -EAGAIN) ?
599                                 urb->transfer_buffer_length : 0;
600                 }
601
602                 bytes_written += usbatm_write_cells(instance, skb,
603                                                   buffer + bytes_written,
604                                                   buf_size - bytes_written);
605
606                 vdbg("%s: wrote %u bytes from skb 0x%p to urb 0x%p",
607                      __func__, bytes_written, skb, urb);
608
609                 if (!UDSL_SKB(skb)->len) {
610                         struct atm_vcc *vcc = UDSL_SKB(skb)->atm.vcc;
611
612                         usbatm_pop(vcc, skb);
613                         atomic_inc(&vcc->stats->tx);
614
615                         skb = skb_dequeue(&instance->sndqueue);
616                 }
617
618                 if (bytes_written == buf_size || (!skb && bytes_written)) {
619                         urb->transfer_buffer_length = bytes_written;
620
621                         if (usbatm_submit_urb(urb))
622                                 break;
623                         urb = NULL;
624                 }
625         }
626
627         instance->current_skb = skb;
628 }
629
630 static void usbatm_cancel_send(struct usbatm_data *instance,
631                                struct atm_vcc *vcc)
632 {
633         struct sk_buff *skb, *n;
634
635         atm_dbg(instance, "%s entered\n", __func__);
636         spin_lock_irq(&instance->sndqueue.lock);
637         for (skb = instance->sndqueue.next, n = skb->next;
638              skb != (struct sk_buff *)&instance->sndqueue;
639              skb = n, n = skb->next)
640                 if (UDSL_SKB(skb)->atm.vcc == vcc) {
641                         atm_dbg(instance, "%s: popping skb 0x%p\n", __func__, skb);
642                         __skb_unlink(skb, &instance->sndqueue);
643                         usbatm_pop(vcc, skb);
644                 }
645         spin_unlock_irq(&instance->sndqueue.lock);
646
647         tasklet_disable(&instance->tx_channel.tasklet);
648         if ((skb = instance->current_skb) && (UDSL_SKB(skb)->atm.vcc == vcc)) {
649                 atm_dbg(instance, "%s: popping current skb (0x%p)\n", __func__, skb);
650                 instance->current_skb = NULL;
651                 usbatm_pop(vcc, skb);
652         }
653         tasklet_enable(&instance->tx_channel.tasklet);
654         atm_dbg(instance, "%s done\n", __func__);
655 }
656
657 static int usbatm_atm_send(struct atm_vcc *vcc, struct sk_buff *skb)
658 {
659         struct usbatm_data *instance = vcc->dev->dev_data;
660         struct usbatm_control *ctrl = UDSL_SKB(skb);
661         int err;
662
663         vdbg("%s called (skb 0x%p, len %u)", __func__, skb, skb->len);
664
665         /* racy disconnection check - fine */
666         if (!instance || instance->disconnected) {
667 #ifdef DEBUG
668                 if (printk_ratelimit())
669                         printk(KERN_DEBUG "%s: %s!\n", __func__, instance ? "disconnected" : "NULL instance");
670 #endif
671                 err = -ENODEV;
672                 goto fail;
673         }
674
675         if (vcc->qos.aal != ATM_AAL5) {
676                 atm_rldbg(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
677                 err = -EINVAL;
678                 goto fail;
679         }
680
681         if (skb->len > ATM_MAX_AAL5_PDU) {
682                 atm_rldbg(instance, "%s: packet too long (%d vs %d)!\n",
683                                 __func__, skb->len, ATM_MAX_AAL5_PDU);
684                 err = -EINVAL;
685                 goto fail;
686         }
687
688         PACKETDEBUG(skb->data, skb->len);
689
690         /* initialize the control block */
691         ctrl->atm.vcc = vcc;
692         ctrl->len = skb->len;
693         ctrl->crc = crc32_be(~0, skb->data, skb->len);
694
695         skb_queue_tail(&instance->sndqueue, skb);
696         tasklet_schedule(&instance->tx_channel.tasklet);
697
698         return 0;
699
700  fail:
701         usbatm_pop(vcc, skb);
702         return err;
703 }
704
705
706 /********************
707 **  bean counting  **
708 ********************/
709
710 static void usbatm_destroy_instance(struct kref *kref)
711 {
712         struct usbatm_data *instance = container_of(kref, struct usbatm_data, refcount);
713
714         dbg("%s", __func__);
715
716         tasklet_kill(&instance->rx_channel.tasklet);
717         tasklet_kill(&instance->tx_channel.tasklet);
718         usb_put_dev(instance->usb_dev);
719         kfree(instance);
720 }
721
722 static void usbatm_get_instance(struct usbatm_data *instance)
723 {
724         dbg("%s", __func__);
725
726         kref_get(&instance->refcount);
727 }
728
729 static void usbatm_put_instance(struct usbatm_data *instance)
730 {
731         dbg("%s", __func__);
732
733         kref_put(&instance->refcount, usbatm_destroy_instance);
734 }
735
736
737 /**********
738 **  ATM  **
739 **********/
740
741 static void usbatm_atm_dev_close(struct atm_dev *atm_dev)
742 {
743         struct usbatm_data *instance = atm_dev->dev_data;
744
745         dbg("%s", __func__);
746
747         if (!instance)
748                 return;
749
750         atm_dev->dev_data = NULL; /* catch bugs */
751         usbatm_put_instance(instance);  /* taken in usbatm_atm_init */
752 }
753
754 static int usbatm_atm_proc_read(struct atm_dev *atm_dev, loff_t * pos, char *page)
755 {
756         struct usbatm_data *instance = atm_dev->dev_data;
757         int left = *pos;
758
759         if (!instance) {
760                 dbg("%s: NULL instance!", __func__);
761                 return -ENODEV;
762         }
763
764         if (!left--)
765                 return sprintf(page, "%s\n", instance->description);
766
767         if (!left--)
768                 return sprintf(page, "MAC: %02x:%02x:%02x:%02x:%02x:%02x\n",
769                                atm_dev->esi[0], atm_dev->esi[1],
770                                atm_dev->esi[2], atm_dev->esi[3],
771                                atm_dev->esi[4], atm_dev->esi[5]);
772
773         if (!left--)
774                 return sprintf(page,
775                                "AAL5: tx %d ( %d err ), rx %d ( %d err, %d drop )\n",
776                                atomic_read(&atm_dev->stats.aal5.tx),
777                                atomic_read(&atm_dev->stats.aal5.tx_err),
778                                atomic_read(&atm_dev->stats.aal5.rx),
779                                atomic_read(&atm_dev->stats.aal5.rx_err),
780                                atomic_read(&atm_dev->stats.aal5.rx_drop));
781
782         if (!left--) {
783                 if (instance->disconnected)
784                         return sprintf(page, "Disconnected\n");
785                 else
786                         switch (atm_dev->signal) {
787                         case ATM_PHY_SIG_FOUND:
788                                 return sprintf(page, "Line up\n");
789                         case ATM_PHY_SIG_LOST:
790                                 return sprintf(page, "Line down\n");
791                         default:
792                                 return sprintf(page, "Line state unknown\n");
793                         }
794         }
795
796         return 0;
797 }
798
799 static int usbatm_atm_open(struct atm_vcc *vcc)
800 {
801         struct usbatm_data *instance = vcc->dev->dev_data;
802         struct usbatm_vcc_data *new = NULL;
803         int ret;
804         int vci = vcc->vci;
805         short vpi = vcc->vpi;
806
807         if (!instance) {
808                 dbg("%s: NULL data!", __func__);
809                 return -ENODEV;
810         }
811
812         atm_dbg(instance, "%s: vpi %hd, vci %d\n", __func__, vpi, vci);
813
814         /* only support AAL5 */
815         if ((vcc->qos.aal != ATM_AAL5)) {
816                 atm_warn(instance, "%s: unsupported ATM type %d!\n", __func__, vcc->qos.aal);
817                 return -EINVAL;
818         }
819
820         /* sanity checks */
821         if ((vcc->qos.rxtp.max_sdu < 0) || (vcc->qos.rxtp.max_sdu > ATM_MAX_AAL5_PDU)) {
822                 atm_dbg(instance, "%s: max_sdu %d out of range!\n", __func__, vcc->qos.rxtp.max_sdu);
823                 return -EINVAL;
824         }
825
826         mutex_lock(&instance->serialize);       /* vs self, usbatm_atm_close, usbatm_usb_disconnect */
827
828         if (instance->disconnected) {
829                 atm_dbg(instance, "%s: disconnected!\n", __func__);
830                 ret = -ENODEV;
831                 goto fail;
832         }
833
834         if (usbatm_find_vcc(instance, vpi, vci)) {
835                 atm_dbg(instance, "%s: %hd/%d already in use!\n", __func__, vpi, vci);
836                 ret = -EADDRINUSE;
837                 goto fail;
838         }
839
840         if (!(new = kzalloc(sizeof(struct usbatm_vcc_data), GFP_KERNEL))) {
841                 atm_err(instance, "%s: no memory for vcc_data!\n", __func__);
842                 ret = -ENOMEM;
843                 goto fail;
844         }
845
846         new->vcc = vcc;
847         new->vpi = vpi;
848         new->vci = vci;
849
850         new->sarb = alloc_skb(usbatm_pdu_length(vcc->qos.rxtp.max_sdu), GFP_KERNEL);
851         if (!new->sarb) {
852                 atm_err(instance, "%s: no memory for SAR buffer!\n", __func__);
853                 ret = -ENOMEM;
854                 goto fail;
855         }
856
857         vcc->dev_data = new;
858
859         tasklet_disable(&instance->rx_channel.tasklet);
860         instance->cached_vcc = new;
861         instance->cached_vpi = vpi;
862         instance->cached_vci = vci;
863         list_add(&new->list, &instance->vcc_list);
864         tasklet_enable(&instance->rx_channel.tasklet);
865
866         set_bit(ATM_VF_ADDR, &vcc->flags);
867         set_bit(ATM_VF_PARTIAL, &vcc->flags);
868         set_bit(ATM_VF_READY, &vcc->flags);
869
870         mutex_unlock(&instance->serialize);
871
872         atm_dbg(instance, "%s: allocated vcc data 0x%p\n", __func__, new);
873
874         return 0;
875
876 fail:
877         kfree(new);
878         mutex_unlock(&instance->serialize);
879         return ret;
880 }
881
882 static void usbatm_atm_close(struct atm_vcc *vcc)
883 {
884         struct usbatm_data *instance = vcc->dev->dev_data;
885         struct usbatm_vcc_data *vcc_data = vcc->dev_data;
886
887         if (!instance || !vcc_data) {
888                 dbg("%s: NULL data!", __func__);
889                 return;
890         }
891
892         atm_dbg(instance, "%s entered\n", __func__);
893
894         atm_dbg(instance, "%s: deallocating vcc 0x%p with vpi %d vci %d\n",
895                 __func__, vcc_data, vcc_data->vpi, vcc_data->vci);
896
897         usbatm_cancel_send(instance, vcc);
898
899         mutex_lock(&instance->serialize);       /* vs self, usbatm_atm_open, usbatm_usb_disconnect */
900
901         tasklet_disable(&instance->rx_channel.tasklet);
902         if (instance->cached_vcc == vcc_data) {
903                 instance->cached_vcc = NULL;
904                 instance->cached_vpi = ATM_VPI_UNSPEC;
905                 instance->cached_vci = ATM_VCI_UNSPEC;
906         }
907         list_del(&vcc_data->list);
908         tasklet_enable(&instance->rx_channel.tasklet);
909
910         kfree_skb(vcc_data->sarb);
911         vcc_data->sarb = NULL;
912
913         kfree(vcc_data);
914         vcc->dev_data = NULL;
915
916         vcc->vpi = ATM_VPI_UNSPEC;
917         vcc->vci = ATM_VCI_UNSPEC;
918         clear_bit(ATM_VF_READY, &vcc->flags);
919         clear_bit(ATM_VF_PARTIAL, &vcc->flags);
920         clear_bit(ATM_VF_ADDR, &vcc->flags);
921
922         mutex_unlock(&instance->serialize);
923
924         atm_dbg(instance, "%s successful\n", __func__);
925 }
926
927 static int usbatm_atm_ioctl(struct atm_dev *atm_dev, unsigned int cmd,
928                           void __user * arg)
929 {
930         struct usbatm_data *instance = atm_dev->dev_data;
931
932         if (!instance || instance->disconnected) {
933                 dbg("%s: %s!", __func__, instance ? "disconnected" : "NULL instance");
934                 return -ENODEV;
935         }
936
937         switch (cmd) {
938         case ATM_QUERYLOOP:
939                 return put_user(ATM_LM_NONE, (int __user *)arg) ? -EFAULT : 0;
940         default:
941                 return -ENOIOCTLCMD;
942         }
943 }
944
945 static int usbatm_atm_init(struct usbatm_data *instance)
946 {
947         struct atm_dev *atm_dev;
948         int ret, i;
949
950         /* ATM init.  The ATM initialization scheme suffers from an intrinsic race
951          * condition: callbacks we register can be executed at once, before we have
952          * initialized the struct atm_dev.  To protect against this, all callbacks
953          * abort if atm_dev->dev_data is NULL. */
954         atm_dev = atm_dev_register(instance->driver_name, &usbatm_atm_devops, -1, NULL);
955         if (!atm_dev) {
956                 usb_err(instance, "%s: failed to register ATM device!\n", __func__);
957                 return -1;
958         }
959
960         instance->atm_dev = atm_dev;
961
962         atm_dev->ci_range.vpi_bits = ATM_CI_MAX;
963         atm_dev->ci_range.vci_bits = ATM_CI_MAX;
964         atm_dev->signal = ATM_PHY_SIG_UNKNOWN;
965
966         /* temp init ATM device, set to 128kbit */
967         atm_dev->link_rate = 128 * 1000 / 424;
968
969         if (instance->driver->atm_start && ((ret = instance->driver->atm_start(instance, atm_dev)) < 0)) {
970                 atm_err(instance, "%s: atm_start failed: %d!\n", __func__, ret);
971                 goto fail;
972         }
973
974         usbatm_get_instance(instance);  /* dropped in usbatm_atm_dev_close */
975
976         /* ready for ATM callbacks */
977         mb();
978         atm_dev->dev_data = instance;
979
980         /* submit all rx URBs */
981         for (i = 0; i < num_rcv_urbs; i++)
982                 usbatm_submit_urb(instance->urbs[i]);
983
984         return 0;
985
986  fail:
987         instance->atm_dev = NULL;
988         atm_dev_deregister(atm_dev); /* usbatm_atm_dev_close will eventually be called */
989         return ret;
990 }
991
992
993 /**********
994 **  USB  **
995 **********/
996
997 static int usbatm_do_heavy_init(void *arg)
998 {
999         struct usbatm_data *instance = arg;
1000         int ret;
1001
1002         daemonize(instance->driver->driver_name);
1003         allow_signal(SIGTERM);
1004
1005         complete(&instance->thread_started);
1006
1007         ret = instance->driver->heavy_init(instance, instance->usb_intf);
1008
1009         if (!ret)
1010                 ret = usbatm_atm_init(instance);
1011
1012         mutex_lock(&instance->serialize);
1013         instance->thread_pid = -1;
1014         mutex_unlock(&instance->serialize);
1015
1016         complete_and_exit(&instance->thread_exited, ret);
1017 }
1018
1019 static int usbatm_heavy_init(struct usbatm_data *instance)
1020 {
1021         int ret = kernel_thread(usbatm_do_heavy_init, instance, CLONE_KERNEL);
1022
1023         if (ret < 0) {
1024                 usb_err(instance, "%s: failed to create kernel_thread (%d)!\n", __func__, ret);
1025                 return ret;
1026         }
1027
1028         mutex_lock(&instance->serialize);
1029         instance->thread_pid = ret;
1030         mutex_unlock(&instance->serialize);
1031
1032         wait_for_completion(&instance->thread_started);
1033
1034         return 0;
1035 }
1036
1037 static void usbatm_tasklet_schedule(unsigned long data)
1038 {
1039         tasklet_schedule((struct tasklet_struct *) data);
1040 }
1041
1042 static void usbatm_init_channel(struct usbatm_channel *channel)
1043 {
1044         spin_lock_init(&channel->lock);
1045         INIT_LIST_HEAD(&channel->list);
1046         channel->delay.function = usbatm_tasklet_schedule;
1047         channel->delay.data = (unsigned long) &channel->tasklet;
1048         init_timer(&channel->delay);
1049 }
1050
1051 int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
1052                      struct usbatm_driver *driver)
1053 {
1054         struct device *dev = &intf->dev;
1055         struct usb_device *usb_dev = interface_to_usbdev(intf);
1056         struct usbatm_data *instance;
1057         char *buf;
1058         int error = -ENOMEM;
1059         int i, length;
1060         unsigned int maxpacket, num_packets;
1061
1062         dev_dbg(dev, "%s: trying driver %s with vendor=%04x, product=%04x, ifnum %2d\n",
1063                         __func__, driver->driver_name,
1064                         le16_to_cpu(usb_dev->descriptor.idVendor),
1065                         le16_to_cpu(usb_dev->descriptor.idProduct),
1066                         intf->altsetting->desc.bInterfaceNumber);
1067
1068         /* instance init */
1069         instance = kzalloc(sizeof(*instance) + sizeof(struct urb *) * (num_rcv_urbs + num_snd_urbs), GFP_KERNEL);
1070         if (!instance) {
1071                 dev_err(dev, "%s: no memory for instance data!\n", __func__);
1072                 return -ENOMEM;
1073         }
1074
1075         /* public fields */
1076
1077         instance->driver = driver;
1078         snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name);
1079
1080         instance->usb_dev = usb_dev;
1081         instance->usb_intf = intf;
1082
1083         buf = instance->description;
1084         length = sizeof(instance->description);
1085
1086         if ((i = usb_string(usb_dev, usb_dev->descriptor.iProduct, buf, length)) < 0)
1087                 goto bind;
1088
1089         buf += i;
1090         length -= i;
1091
1092         i = scnprintf(buf, length, " (");
1093         buf += i;
1094         length -= i;
1095
1096         if (length <= 0 || (i = usb_make_path(usb_dev, buf, length)) < 0)
1097                 goto bind;
1098
1099         buf += i;
1100         length -= i;
1101
1102         snprintf(buf, length, ")");
1103
1104  bind:
1105         if (driver->bind && (error = driver->bind(instance, intf, id)) < 0) {
1106                         dev_err(dev, "%s: bind failed: %d!\n", __func__, error);
1107                         goto fail_free;
1108         }
1109
1110         /* private fields */
1111
1112         kref_init(&instance->refcount);         /* dropped in usbatm_usb_disconnect */
1113         mutex_init(&instance->serialize);
1114
1115         instance->thread_pid = -1;
1116         init_completion(&instance->thread_started);
1117         init_completion(&instance->thread_exited);
1118
1119         INIT_LIST_HEAD(&instance->vcc_list);
1120         skb_queue_head_init(&instance->sndqueue);
1121
1122         usbatm_init_channel(&instance->rx_channel);
1123         usbatm_init_channel(&instance->tx_channel);
1124         tasklet_init(&instance->rx_channel.tasklet, usbatm_rx_process, (unsigned long)instance);
1125         tasklet_init(&instance->tx_channel.tasklet, usbatm_tx_process, (unsigned long)instance);
1126         instance->rx_channel.stride = ATM_CELL_SIZE + driver->rx_padding;
1127         instance->tx_channel.stride = ATM_CELL_SIZE + driver->tx_padding;
1128         instance->rx_channel.usbatm = instance->tx_channel.usbatm = instance;
1129
1130         if ((instance->flags & UDSL_USE_ISOC) && driver->isoc_in)
1131                 instance->rx_channel.endpoint = usb_rcvisocpipe(usb_dev, driver->isoc_in);
1132         else
1133                 instance->rx_channel.endpoint = usb_rcvbulkpipe(usb_dev, driver->bulk_in);
1134
1135         instance->tx_channel.endpoint = usb_sndbulkpipe(usb_dev, driver->bulk_out);
1136
1137         /* tx buffer size must be a positive multiple of the stride */
1138         instance->tx_channel.buf_size = max (instance->tx_channel.stride,
1139                         snd_buf_bytes - (snd_buf_bytes % instance->tx_channel.stride));
1140
1141         /* rx buffer size must be a positive multiple of the endpoint maxpacket */
1142         maxpacket = usb_maxpacket(usb_dev, instance->rx_channel.endpoint, 0);
1143
1144         if ((maxpacket < 1) || (maxpacket > UDSL_MAX_BUF_SIZE)) {
1145                 dev_err(dev, "%s: invalid endpoint %02x!\n", __func__,
1146                                 usb_pipeendpoint(instance->rx_channel.endpoint));
1147                 error = -EINVAL;
1148                 goto fail_unbind;
1149         }
1150
1151         num_packets = max (1U, (rcv_buf_bytes + maxpacket / 2) / maxpacket); /* round */
1152
1153         if (num_packets * maxpacket > UDSL_MAX_BUF_SIZE)
1154                 num_packets--;
1155
1156         instance->rx_channel.buf_size = num_packets * maxpacket;
1157         instance->rx_channel.packet_size = maxpacket;
1158
1159 #ifdef DEBUG
1160         for (i = 0; i < 2; i++) {
1161                 struct usbatm_channel *channel = i ?
1162                         &instance->tx_channel : &instance->rx_channel;
1163
1164                 dev_dbg(dev, "%s: using %d byte buffer for %s channel 0x%p\n", __func__, channel->buf_size, i ? "tx" : "rx", channel);
1165         }
1166 #endif
1167
1168         /* initialize urbs */
1169
1170         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1171                 u8 *buffer;
1172                 struct usbatm_channel *channel = i < num_rcv_urbs ?
1173                         &instance->rx_channel : &instance->tx_channel;
1174                 struct urb *urb;
1175                 unsigned int iso_packets = usb_pipeisoc(channel->endpoint) ? channel->buf_size / channel->packet_size : 0;
1176
1177                 UDSL_ASSERT(!usb_pipeisoc(channel->endpoint) || usb_pipein(channel->endpoint));
1178
1179                 urb = usb_alloc_urb(iso_packets, GFP_KERNEL);
1180                 if (!urb) {
1181                         dev_err(dev, "%s: no memory for urb %d!\n", __func__, i);
1182                         error = -ENOMEM;
1183                         goto fail_unbind;
1184                 }
1185
1186                 instance->urbs[i] = urb;
1187
1188                 /* zero the tx padding to avoid leaking information */
1189                 buffer = kzalloc(channel->buf_size, GFP_KERNEL);
1190                 if (!buffer) {
1191                         dev_err(dev, "%s: no memory for buffer %d!\n", __func__, i);
1192                         error = -ENOMEM;
1193                         goto fail_unbind;
1194                 }
1195
1196                 usb_fill_bulk_urb(urb, instance->usb_dev, channel->endpoint,
1197                                   buffer, channel->buf_size, usbatm_complete, channel);
1198                 if (iso_packets) {
1199                         int j;
1200                         urb->interval = 1;
1201                         urb->transfer_flags = URB_ISO_ASAP;
1202                         urb->number_of_packets = iso_packets;
1203                         for (j = 0; j < iso_packets; j++) {
1204                                 urb->iso_frame_desc[j].offset = channel->packet_size * j;
1205                                 urb->iso_frame_desc[j].length = channel->packet_size;
1206                         }
1207                 }
1208
1209                 /* put all tx URBs on the list of spares */
1210                 if (i >= num_rcv_urbs)
1211                         list_add_tail(&urb->urb_list, &channel->list);
1212
1213                 vdbg("%s: alloced buffer 0x%p buf size %u urb 0x%p",
1214                      __func__, urb->transfer_buffer, urb->transfer_buffer_length, urb);
1215         }
1216
1217         instance->cached_vpi = ATM_VPI_UNSPEC;
1218         instance->cached_vci = ATM_VCI_UNSPEC;
1219         instance->cell_buf = kmalloc(instance->rx_channel.stride, GFP_KERNEL);
1220
1221         if (!instance->cell_buf) {
1222                 dev_err(dev, "%s: no memory for cell buffer!\n", __func__);
1223                 error = -ENOMEM;
1224                 goto fail_unbind;
1225         }
1226
1227         if (!(instance->flags & UDSL_SKIP_HEAVY_INIT) && driver->heavy_init) {
1228                 error = usbatm_heavy_init(instance);
1229         } else {
1230                 complete(&instance->thread_exited);     /* pretend that heavy_init was run */
1231                 error = usbatm_atm_init(instance);
1232         }
1233
1234         if (error < 0)
1235                 goto fail_unbind;
1236
1237         usb_get_dev(usb_dev);
1238         usb_set_intfdata(intf, instance);
1239
1240         return 0;
1241
1242  fail_unbind:
1243         if (instance->driver->unbind)
1244                 instance->driver->unbind(instance, intf);
1245  fail_free:
1246         kfree(instance->cell_buf);
1247
1248         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1249                 if (instance->urbs[i])
1250                         kfree(instance->urbs[i]->transfer_buffer);
1251                 usb_free_urb(instance->urbs[i]);
1252         }
1253
1254         kfree (instance);
1255
1256         return error;
1257 }
1258 EXPORT_SYMBOL_GPL(usbatm_usb_probe);
1259
1260 void usbatm_usb_disconnect(struct usb_interface *intf)
1261 {
1262         struct device *dev = &intf->dev;
1263         struct usbatm_data *instance = usb_get_intfdata(intf);
1264         struct usbatm_vcc_data *vcc_data;
1265         int i;
1266
1267         dev_dbg(dev, "%s entered\n", __func__);
1268
1269         if (!instance) {
1270                 dev_dbg(dev, "%s: NULL instance!\n", __func__);
1271                 return;
1272         }
1273
1274         usb_set_intfdata(intf, NULL);
1275
1276         mutex_lock(&instance->serialize);
1277         instance->disconnected = 1;
1278         if (instance->thread_pid >= 0)
1279                 kill_proc(instance->thread_pid, SIGTERM, 1);
1280         mutex_unlock(&instance->serialize);
1281
1282         wait_for_completion(&instance->thread_exited);
1283
1284         mutex_lock(&instance->serialize);
1285         list_for_each_entry(vcc_data, &instance->vcc_list, list)
1286                 vcc_release_async(vcc_data->vcc, -EPIPE);
1287         mutex_unlock(&instance->serialize);
1288
1289         tasklet_disable(&instance->rx_channel.tasklet);
1290         tasklet_disable(&instance->tx_channel.tasklet);
1291
1292         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++)
1293                 usb_kill_urb(instance->urbs[i]);
1294
1295         del_timer_sync(&instance->rx_channel.delay);
1296         del_timer_sync(&instance->tx_channel.delay);
1297
1298         /* turn usbatm_[rt]x_process into something close to a no-op */
1299         /* no need to take the spinlock */
1300         INIT_LIST_HEAD(&instance->rx_channel.list);
1301         INIT_LIST_HEAD(&instance->tx_channel.list);
1302
1303         tasklet_enable(&instance->rx_channel.tasklet);
1304         tasklet_enable(&instance->tx_channel.tasklet);
1305
1306         if (instance->atm_dev && instance->driver->atm_stop)
1307                 instance->driver->atm_stop(instance, instance->atm_dev);
1308
1309         if (instance->driver->unbind)
1310                 instance->driver->unbind(instance, intf);
1311
1312         instance->driver_data = NULL;
1313
1314         for (i = 0; i < num_rcv_urbs + num_snd_urbs; i++) {
1315                 kfree(instance->urbs[i]->transfer_buffer);
1316                 usb_free_urb(instance->urbs[i]);
1317         }
1318
1319         kfree(instance->cell_buf);
1320
1321         /* ATM finalize */
1322         if (instance->atm_dev)
1323                 atm_dev_deregister(instance->atm_dev);
1324
1325         usbatm_put_instance(instance);  /* taken in usbatm_usb_probe */
1326 }
1327 EXPORT_SYMBOL_GPL(usbatm_usb_disconnect);
1328
1329
1330 /***********
1331 **  init  **
1332 ***********/
1333
1334 static int __init usbatm_usb_init(void)
1335 {
1336         dbg("%s: driver version %s", __func__, DRIVER_VERSION);
1337
1338         if (sizeof(struct usbatm_control) > sizeof(((struct sk_buff *) 0)->cb)) {
1339                 printk(KERN_ERR "%s unusable with this kernel!\n", usbatm_driver_name);
1340                 return -EIO;
1341         }
1342
1343         if ((num_rcv_urbs > UDSL_MAX_RCV_URBS)
1344             || (num_snd_urbs > UDSL_MAX_SND_URBS)
1345             || (rcv_buf_bytes < 1)
1346             || (rcv_buf_bytes > UDSL_MAX_BUF_SIZE)
1347             || (snd_buf_bytes < 1)
1348             || (snd_buf_bytes > UDSL_MAX_BUF_SIZE))
1349                 return -EINVAL;
1350
1351         return 0;
1352 }
1353 module_init(usbatm_usb_init);
1354
1355 static void __exit usbatm_usb_exit(void)
1356 {
1357         dbg("%s", __func__);
1358 }
1359 module_exit(usbatm_usb_exit);
1360
1361 MODULE_AUTHOR(DRIVER_AUTHOR);
1362 MODULE_DESCRIPTION(DRIVER_DESC);
1363 MODULE_LICENSE("GPL");
1364 MODULE_VERSION(DRIVER_VERSION);
1365
1366 /************
1367 **  debug  **
1368 ************/
1369
1370 #ifdef VERBOSE_DEBUG
1371 static int usbatm_print_packet(const unsigned char *data, int len)
1372 {
1373         unsigned char buffer[256];
1374         int i = 0, j = 0;
1375
1376         for (i = 0; i < len;) {
1377                 buffer[0] = '\0';
1378                 sprintf(buffer, "%.3d :", i);
1379                 for (j = 0; (j < 16) && (i < len); j++, i++) {
1380                         sprintf(buffer, "%s %2.2x", buffer, data[i]);
1381                 }
1382                 dbg("%s", buffer);
1383         }
1384         return i;
1385 }
1386 #endif