Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
[linux-2.6] / drivers / media / video / dabusb.c
1 /*****************************************************************************/
2
3 /*
4  *      dabusb.c  --  dab usb driver.
5  *
6  *      Copyright (C) 1999  Deti Fliegl (deti@fliegl.de)
7  *
8  *      This program is free software; you can redistribute it and/or modify
9  *      it under the terms of the GNU General Public License as published by
10  *      the Free Software Foundation; either version 2 of the License, or
11  *      (at your option) any later version.
12  *
13  *      This program is distributed in the hope that it will be useful,
14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  *      GNU General Public License for more details.
17  *
18  *      You should have received a copy of the GNU General Public License
19  *      along with this program; if not, write to the Free Software
20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21  *
22  *
23  *
24  *  $Id: dabusb.c,v 1.54 2000/07/24 21:39:39 deti Exp $
25  *
26  */
27
28 /*****************************************************************************/
29
30 #include <linux/module.h>
31 #include <linux/socket.h>
32 #include <linux/list.h>
33 #include <linux/vmalloc.h>
34 #include <linux/slab.h>
35 #include <linux/init.h>
36 #include <asm/uaccess.h>
37 #include <asm/atomic.h>
38 #include <linux/delay.h>
39 #include <linux/usb.h>
40 #include <linux/mutex.h>
41 #include <linux/firmware.h>
42 #include <linux/ihex.h>
43
44 #include "dabusb.h"
45
46 /*
47  * Version Information
48  */
49 #define DRIVER_VERSION "v1.54"
50 #define DRIVER_AUTHOR "Deti Fliegl, deti@fliegl.de"
51 #define DRIVER_DESC "DAB-USB Interface Driver for Linux (c)1999"
52
53 /* --------------------------------------------------------------------- */
54
55 #ifdef CONFIG_USB_DYNAMIC_MINORS
56 #define NRDABUSB 256
57 #else
58 #define NRDABUSB 4
59 #endif
60
61 /*-------------------------------------------------------------------*/
62
63 static dabusb_t dabusb[NRDABUSB];
64 static int buffers = 256;
65 static struct usb_driver dabusb_driver;
66
67 /*-------------------------------------------------------------------*/
68
69 static int dabusb_add_buf_tail (pdabusb_t s, struct list_head *dst, struct list_head *src)
70 {
71         unsigned long flags;
72         struct list_head *tmp;
73         int ret = 0;
74
75         spin_lock_irqsave (&s->lock, flags);
76
77         if (list_empty (src)) {
78                 // no elements in source buffer
79                 ret = -1;
80                 goto err;
81         }
82         tmp = src->next;
83         list_move_tail (tmp, dst);
84
85   err:  spin_unlock_irqrestore (&s->lock, flags);
86         return ret;
87 }
88 /*-------------------------------------------------------------------*/
89 #ifdef DEBUG
90 static void dump_urb (struct urb *urb)
91 {
92         dbg("urb                   :%p", urb);
93         dbg("dev                   :%p", urb->dev);
94         dbg("pipe                  :%08X", urb->pipe);
95         dbg("status                :%d", urb->status);
96         dbg("transfer_flags        :%08X", urb->transfer_flags);
97         dbg("transfer_buffer       :%p", urb->transfer_buffer);
98         dbg("transfer_buffer_length:%d", urb->transfer_buffer_length);
99         dbg("actual_length         :%d", urb->actual_length);
100         dbg("setup_packet          :%p", urb->setup_packet);
101         dbg("start_frame           :%d", urb->start_frame);
102         dbg("number_of_packets     :%d", urb->number_of_packets);
103         dbg("interval              :%d", urb->interval);
104         dbg("error_count           :%d", urb->error_count);
105         dbg("context               :%p", urb->context);
106         dbg("complete              :%p", urb->complete);
107 }
108 #endif
109 /*-------------------------------------------------------------------*/
110 static int dabusb_cancel_queue (pdabusb_t s, struct list_head *q)
111 {
112         unsigned long flags;
113         pbuff_t b;
114
115         dbg("dabusb_cancel_queue");
116
117         spin_lock_irqsave (&s->lock, flags);
118
119         list_for_each_entry(b, q, buff_list) {
120 #ifdef DEBUG
121                 dump_urb(b->purb);
122 #endif
123                 usb_unlink_urb (b->purb);
124         }
125         spin_unlock_irqrestore (&s->lock, flags);
126         return 0;
127 }
128 /*-------------------------------------------------------------------*/
129 static int dabusb_free_queue (struct list_head *q)
130 {
131         struct list_head *tmp;
132         struct list_head *p;
133         pbuff_t b;
134
135         dbg("dabusb_free_queue");
136         for (p = q->next; p != q;) {
137                 b = list_entry (p, buff_t, buff_list);
138
139 #ifdef DEBUG
140                 dump_urb(b->purb);
141 #endif
142                 kfree(b->purb->transfer_buffer);
143                 usb_free_urb(b->purb);
144                 tmp = p->next;
145                 list_del (p);
146                 kfree (b);
147                 p = tmp;
148         }
149
150         return 0;
151 }
152 /*-------------------------------------------------------------------*/
153 static int dabusb_free_buffers (pdabusb_t s)
154 {
155         unsigned long flags;
156         dbg("dabusb_free_buffers");
157
158         spin_lock_irqsave(&s->lock, flags);
159
160         dabusb_free_queue (&s->free_buff_list);
161         dabusb_free_queue (&s->rec_buff_list);
162
163         spin_unlock_irqrestore(&s->lock, flags);
164
165         s->got_mem = 0;
166         return 0;
167 }
168 /*-------------------------------------------------------------------*/
169 static void dabusb_iso_complete (struct urb *purb)
170 {
171         pbuff_t b = purb->context;
172         pdabusb_t s = b->s;
173         int i;
174         int len;
175         int dst = 0;
176         void *buf = purb->transfer_buffer;
177
178         dbg("dabusb_iso_complete");
179
180         // process if URB was not killed
181         if (purb->status != -ENOENT) {
182                 unsigned int pipe = usb_rcvisocpipe (purb->dev, _DABUSB_ISOPIPE);
183                 int pipesize = usb_maxpacket (purb->dev, pipe, usb_pipeout (pipe));
184                 for (i = 0; i < purb->number_of_packets; i++)
185                         if (!purb->iso_frame_desc[i].status) {
186                                 len = purb->iso_frame_desc[i].actual_length;
187                                 if (len <= pipesize) {
188                                         memcpy (buf + dst, buf + purb->iso_frame_desc[i].offset, len);
189                                         dst += len;
190                                 }
191                                 else
192                                         err("dabusb_iso_complete: invalid len %d", len);
193                         }
194                         else
195                                 warn("dabusb_iso_complete: corrupted packet status: %d", purb->iso_frame_desc[i].status);
196                 if (dst != purb->actual_length)
197                         err("dst!=purb->actual_length:%d!=%d", dst, purb->actual_length);
198         }
199
200         if (atomic_dec_and_test (&s->pending_io) && !s->remove_pending && s->state != _stopped) {
201                 s->overruns++;
202                 err("overrun (%d)", s->overruns);
203         }
204         wake_up (&s->wait);
205 }
206 /*-------------------------------------------------------------------*/
207 static int dabusb_alloc_buffers (pdabusb_t s)
208 {
209         int transfer_len = 0;
210         pbuff_t b;
211         unsigned int pipe = usb_rcvisocpipe (s->usbdev, _DABUSB_ISOPIPE);
212         int pipesize = usb_maxpacket (s->usbdev, pipe, usb_pipeout (pipe));
213         int packets = _ISOPIPESIZE / pipesize;
214         int transfer_buffer_length = packets * pipesize;
215         int i;
216
217         dbg("dabusb_alloc_buffers pipesize:%d packets:%d transfer_buffer_len:%d",
218                  pipesize, packets, transfer_buffer_length);
219
220         while (transfer_len < (s->total_buffer_size << 10)) {
221                 b = kzalloc(sizeof (buff_t), GFP_KERNEL);
222                 if (!b) {
223                         err("kzalloc(sizeof(buff_t))==NULL");
224                         goto err;
225                 }
226                 b->s = s;
227                 b->purb = usb_alloc_urb(packets, GFP_KERNEL);
228                 if (!b->purb) {
229                         err("usb_alloc_urb == NULL");
230                         kfree (b);
231                         goto err;
232                 }
233
234                 b->purb->transfer_buffer = kmalloc (transfer_buffer_length, GFP_KERNEL);
235                 if (!b->purb->transfer_buffer) {
236                         kfree (b->purb);
237                         kfree (b);
238                         err("kmalloc(%d)==NULL", transfer_buffer_length);
239                         goto err;
240                 }
241
242                 b->purb->transfer_buffer_length = transfer_buffer_length;
243                 b->purb->number_of_packets = packets;
244                 b->purb->complete = dabusb_iso_complete;
245                 b->purb->context = b;
246                 b->purb->dev = s->usbdev;
247                 b->purb->pipe = pipe;
248                 b->purb->transfer_flags = URB_ISO_ASAP;
249
250                 for (i = 0; i < packets; i++) {
251                         b->purb->iso_frame_desc[i].offset = i * pipesize;
252                         b->purb->iso_frame_desc[i].length = pipesize;
253                 }
254
255                 transfer_len += transfer_buffer_length;
256                 list_add_tail (&b->buff_list, &s->free_buff_list);
257         }
258         s->got_mem = transfer_len;
259
260         return 0;
261
262         err:
263         dabusb_free_buffers (s);
264         return -ENOMEM;
265 }
266 /*-------------------------------------------------------------------*/
267 static int dabusb_bulk (pdabusb_t s, pbulk_transfer_t pb)
268 {
269         int ret;
270         unsigned int pipe;
271         int actual_length;
272
273         dbg("dabusb_bulk");
274
275         if (!pb->pipe)
276                 pipe = usb_rcvbulkpipe (s->usbdev, 2);
277         else
278                 pipe = usb_sndbulkpipe (s->usbdev, 2);
279
280         ret=usb_bulk_msg(s->usbdev, pipe, pb->data, pb->size, &actual_length, 100);
281         if(ret<0) {
282                 err("dabusb: usb_bulk_msg failed(%d)",ret);
283
284                 if (usb_set_interface (s->usbdev, _DABUSB_IF, 1) < 0) {
285                         err("set_interface failed");
286                         return -EINVAL;
287                 }
288
289         }
290
291         if( ret == -EPIPE ) {
292                 warn("CLEAR_FEATURE request to remove STALL condition.");
293                 if(usb_clear_halt(s->usbdev, usb_pipeendpoint(pipe)))
294                         err("request failed");
295         }
296
297         pb->size = actual_length;
298         return ret;
299 }
300 /* --------------------------------------------------------------------- */
301 static int dabusb_writemem (pdabusb_t s, int pos, const unsigned char *data,
302                             int len)
303 {
304         int ret;
305         unsigned char *transfer_buffer =  kmalloc (len, GFP_KERNEL);
306
307         if (!transfer_buffer) {
308                 err("dabusb_writemem: kmalloc(%d) failed.", len);
309                 return -ENOMEM;
310         }
311
312         memcpy (transfer_buffer, data, len);
313
314         ret=usb_control_msg(s->usbdev, usb_sndctrlpipe( s->usbdev, 0 ), 0xa0, 0x40, pos, 0, transfer_buffer, len, 300);
315
316         kfree (transfer_buffer);
317         return ret;
318 }
319 /* --------------------------------------------------------------------- */
320 static int dabusb_8051_reset (pdabusb_t s, unsigned char reset_bit)
321 {
322         dbg("dabusb_8051_reset: %d",reset_bit);
323         return dabusb_writemem (s, CPUCS_REG, &reset_bit, 1);
324 }
325 /* --------------------------------------------------------------------- */
326 static int dabusb_loadmem (pdabusb_t s, const char *fname)
327 {
328         int ret;
329         const struct ihex_binrec *rec;
330         const struct firmware *fw;
331
332         dbg("Enter dabusb_loadmem (internal)");
333
334         ret = request_ihex_firmware(&fw, "dabusb/firmware.fw", &s->usbdev->dev);
335         if (ret) {
336                 err("Failed to load \"dabusb/firmware.fw\": %d\n", ret);
337                 goto out;
338         }
339         ret = dabusb_8051_reset (s, 1);
340
341         for (rec = (const struct ihex_binrec *)fw->data; rec;
342              rec = ihex_next_binrec(rec)) {
343                 dbg("dabusb_writemem: %04X %p %d)", be32_to_cpu(rec->addr),
344                     rec->data, be16_to_cpu(rec->len));
345
346                 ret = dabusb_writemem(s, be32_to_cpu(rec->addr), rec->data,
347                                        be16_to_cpu(rec->len));
348                 if (ret < 0) {
349                         err("dabusb_writemem failed (%d %04X %p %d)", ret,
350                             be32_to_cpu(rec->addr), rec->data,
351                             be16_to_cpu(rec->len));
352                         break;
353                 }
354         }
355         ret = dabusb_8051_reset (s, 0);
356         release_firmware(fw);
357  out:
358         dbg("dabusb_loadmem: exit");
359
360         return ret;
361 }
362 /* --------------------------------------------------------------------- */
363 static int dabusb_fpga_clear (pdabusb_t s, pbulk_transfer_t b)
364 {
365         b->size = 4;
366         b->data[0] = 0x2a;
367         b->data[1] = 0;
368         b->data[2] = 0;
369         b->data[3] = 0;
370
371         dbg("dabusb_fpga_clear");
372
373         return dabusb_bulk (s, b);
374 }
375 /* --------------------------------------------------------------------- */
376 static int dabusb_fpga_init (pdabusb_t s, pbulk_transfer_t b)
377 {
378         b->size = 4;
379         b->data[0] = 0x2c;
380         b->data[1] = 0;
381         b->data[2] = 0;
382         b->data[3] = 0;
383
384         dbg("dabusb_fpga_init");
385
386         return dabusb_bulk (s, b);
387 }
388 /* --------------------------------------------------------------------- */
389 static int dabusb_fpga_download (pdabusb_t s, const char *fname)
390 {
391         pbulk_transfer_t b = kmalloc (sizeof (bulk_transfer_t), GFP_KERNEL);
392         const struct firmware *fw;
393         unsigned int blen, n;
394         int ret;
395
396         dbg("Enter dabusb_fpga_download (internal)");
397
398         if (!b) {
399                 err("kmalloc(sizeof(bulk_transfer_t))==NULL");
400                 return -ENOMEM;
401         }
402
403         ret = request_firmware(&fw, "dabusb/bitstream.bin", &s->usbdev->dev);
404         if (ret) {
405                 err("Failed to load \"dabusb/bitstream.bin\": %d\n", ret);
406                 kfree(b);
407                 return ret;
408         }
409
410         b->pipe = 1;
411         ret = dabusb_fpga_clear (s, b);
412         mdelay (10);
413         blen = fw->data[73] + (fw->data[72] << 8);
414
415         dbg("Bitstream len: %i", blen);
416
417         b->data[0] = 0x2b;
418         b->data[1] = 0;
419         b->data[2] = 0;
420         b->data[3] = 60;
421
422         for (n = 0; n <= blen + 60; n += 60) {
423                 // some cclks for startup
424                 b->size = 64;
425                 memcpy (b->data + 4, fw->data + 74 + n, 60);
426                 ret = dabusb_bulk (s, b);
427                 if (ret < 0) {
428                         err("dabusb_bulk failed.");
429                         break;
430                 }
431                 mdelay (1);
432         }
433
434         ret = dabusb_fpga_init (s, b);
435         kfree (b);
436         release_firmware(fw);
437
438         dbg("exit dabusb_fpga_download");
439
440         return ret;
441 }
442
443 static int dabusb_stop (pdabusb_t s)
444 {
445         dbg("dabusb_stop");
446
447         s->state = _stopped;
448         dabusb_cancel_queue (s, &s->rec_buff_list);
449
450         dbg("pending_io: %d", s->pending_io.counter);
451
452         s->pending_io.counter = 0;
453         return 0;
454 }
455
456 static int dabusb_startrek (pdabusb_t s)
457 {
458         if (!s->got_mem && s->state != _started) {
459
460                 dbg("dabusb_startrek");
461
462                 if (dabusb_alloc_buffers (s) < 0)
463                         return -ENOMEM;
464                 dabusb_stop (s);
465                 s->state = _started;
466                 s->readptr = 0;
467         }
468
469         if (!list_empty (&s->free_buff_list)) {
470                 pbuff_t end;
471                 int ret;
472
473         while (!dabusb_add_buf_tail (s, &s->rec_buff_list, &s->free_buff_list)) {
474
475                         dbg("submitting: end:%p s->rec_buff_list:%p", s->rec_buff_list.prev, &s->rec_buff_list);
476
477                         end = list_entry (s->rec_buff_list.prev, buff_t, buff_list);
478
479                         ret = usb_submit_urb (end->purb, GFP_KERNEL);
480                         if (ret) {
481                                 err("usb_submit_urb returned:%d", ret);
482                                 if (dabusb_add_buf_tail (s, &s->free_buff_list, &s->rec_buff_list))
483                                         err("startrek: dabusb_add_buf_tail failed");
484                                 break;
485                         }
486                         else
487                                 atomic_inc (&s->pending_io);
488                 }
489                 dbg("pending_io: %d",s->pending_io.counter);
490         }
491
492         return 0;
493 }
494
495 static ssize_t dabusb_read (struct file *file, char __user *buf, size_t count, loff_t * ppos)
496 {
497         pdabusb_t s = (pdabusb_t) file->private_data;
498         unsigned long flags;
499         unsigned ret = 0;
500         int rem;
501         int cnt;
502         pbuff_t b;
503         struct urb *purb = NULL;
504
505         dbg("dabusb_read");
506
507         if (*ppos)
508                 return -ESPIPE;
509
510         if (s->remove_pending)
511                 return -EIO;
512
513
514         if (!s->usbdev)
515                 return -EIO;
516
517         while (count > 0) {
518                 dabusb_startrek (s);
519
520                 spin_lock_irqsave (&s->lock, flags);
521
522                 if (list_empty (&s->rec_buff_list)) {
523
524                         spin_unlock_irqrestore(&s->lock, flags);
525
526                         err("error: rec_buf_list is empty");
527                         goto err;
528                 }
529
530                 b = list_entry (s->rec_buff_list.next, buff_t, buff_list);
531                 purb = b->purb;
532
533                 spin_unlock_irqrestore(&s->lock, flags);
534
535                 if (purb->status == -EINPROGRESS) {
536                         if (file->f_flags & O_NONBLOCK)         // return nonblocking
537                          {
538                                 if (!ret)
539                                         ret = -EAGAIN;
540                                 goto err;
541                         }
542
543                         interruptible_sleep_on (&s->wait);
544
545                         if (signal_pending (current)) {
546                                 if (!ret)
547                                         ret = -ERESTARTSYS;
548                                 goto err;
549                         }
550
551                         spin_lock_irqsave (&s->lock, flags);
552
553                         if (list_empty (&s->rec_buff_list)) {
554                                 spin_unlock_irqrestore(&s->lock, flags);
555                                 err("error: still no buffer available.");
556                                 goto err;
557                         }
558                         spin_unlock_irqrestore(&s->lock, flags);
559                         s->readptr = 0;
560                 }
561                 if (s->remove_pending) {
562                         ret = -EIO;
563                         goto err;
564                 }
565
566                 rem = purb->actual_length - s->readptr;         // set remaining bytes to copy
567
568                 if (count >= rem)
569                         cnt = rem;
570                 else
571                         cnt = count;
572
573                 dbg("copy_to_user:%p %p %d",buf, purb->transfer_buffer + s->readptr, cnt);
574
575                 if (copy_to_user (buf, purb->transfer_buffer + s->readptr, cnt)) {
576                         err("read: copy_to_user failed");
577                         if (!ret)
578                                 ret = -EFAULT;
579                         goto err;
580                 }
581
582                 s->readptr += cnt;
583                 count -= cnt;
584                 buf += cnt;
585                 ret += cnt;
586
587                 if (s->readptr == purb->actual_length) {
588                         // finished, take next buffer
589                         if (dabusb_add_buf_tail (s, &s->free_buff_list, &s->rec_buff_list))
590                                 err("read: dabusb_add_buf_tail failed");
591                         s->readptr = 0;
592                 }
593         }
594       err:                      //mutex_unlock(&s->mutex);
595         return ret;
596 }
597
598 static int dabusb_open (struct inode *inode, struct file *file)
599 {
600         int devnum = iminor(inode);
601         pdabusb_t s;
602
603         if (devnum < DABUSB_MINOR || devnum >= (DABUSB_MINOR + NRDABUSB))
604                 return -EIO;
605
606         s = &dabusb[devnum - DABUSB_MINOR];
607
608         dbg("dabusb_open");
609         mutex_lock(&s->mutex);
610
611         while (!s->usbdev || s->opened) {
612                 mutex_unlock(&s->mutex);
613
614                 if (file->f_flags & O_NONBLOCK) {
615                         return -EBUSY;
616                 }
617                 msleep_interruptible(500);
618
619                 if (signal_pending (current)) {
620                         return -EAGAIN;
621                 }
622                 mutex_lock(&s->mutex);
623         }
624         if (usb_set_interface (s->usbdev, _DABUSB_IF, 1) < 0) {
625                 mutex_unlock(&s->mutex);
626                 err("set_interface failed");
627                 return -EINVAL;
628         }
629         s->opened = 1;
630         mutex_unlock(&s->mutex);
631
632         file->f_pos = 0;
633         file->private_data = s;
634
635         return nonseekable_open(inode, file);
636 }
637
638 static int dabusb_release (struct inode *inode, struct file *file)
639 {
640         pdabusb_t s = (pdabusb_t) file->private_data;
641
642         dbg("dabusb_release");
643
644         mutex_lock(&s->mutex);
645         dabusb_stop (s);
646         dabusb_free_buffers (s);
647         mutex_unlock(&s->mutex);
648
649         if (!s->remove_pending) {
650                 if (usb_set_interface (s->usbdev, _DABUSB_IF, 0) < 0)
651                         err("set_interface failed");
652         }
653         else
654                 wake_up (&s->remove_ok);
655
656         s->opened = 0;
657         return 0;
658 }
659
660 static int dabusb_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
661 {
662         pdabusb_t s = (pdabusb_t) file->private_data;
663         pbulk_transfer_t pbulk;
664         int ret = 0;
665         int version = DABUSB_VERSION;
666
667         dbg("dabusb_ioctl");
668
669         if (s->remove_pending)
670                 return -EIO;
671
672         mutex_lock(&s->mutex);
673
674         if (!s->usbdev) {
675                 mutex_unlock(&s->mutex);
676                 return -EIO;
677         }
678
679         switch (cmd) {
680
681         case IOCTL_DAB_BULK:
682                 pbulk = kmalloc(sizeof (bulk_transfer_t), GFP_KERNEL);
683
684                 if (!pbulk) {
685                         ret = -ENOMEM;
686                         break;
687                 }
688
689                 if (copy_from_user (pbulk, (void __user *) arg, sizeof (bulk_transfer_t))) {
690                         ret = -EFAULT;
691                         kfree (pbulk);
692                         break;
693                 }
694
695                 ret=dabusb_bulk (s, pbulk);
696                 if(ret==0)
697                         if (copy_to_user((void __user *)arg, pbulk,
698                                          sizeof(bulk_transfer_t)))
699                                 ret = -EFAULT;
700                 kfree (pbulk);
701                 break;
702
703         case IOCTL_DAB_OVERRUNS:
704                 ret = put_user (s->overruns, (unsigned int __user *) arg);
705                 break;
706
707         case IOCTL_DAB_VERSION:
708                 ret = put_user (version, (unsigned int __user *) arg);
709                 break;
710
711         default:
712                 ret = -ENOIOCTLCMD;
713                 break;
714         }
715         mutex_unlock(&s->mutex);
716         return ret;
717 }
718
719 static const struct file_operations dabusb_fops =
720 {
721         .owner =        THIS_MODULE,
722         .llseek =       no_llseek,
723         .read =         dabusb_read,
724         .ioctl =        dabusb_ioctl,
725         .open =         dabusb_open,
726         .release =      dabusb_release,
727 };
728
729 static struct usb_class_driver dabusb_class = {
730         .name =         "dabusb%d",
731         .fops =         &dabusb_fops,
732         .minor_base =   DABUSB_MINOR,
733 };
734
735
736 /* --------------------------------------------------------------------- */
737 static int dabusb_probe (struct usb_interface *intf,
738                          const struct usb_device_id *id)
739 {
740         struct usb_device *usbdev = interface_to_usbdev(intf);
741         int retval;
742         pdabusb_t s;
743
744         dbg("dabusb: probe: vendor id 0x%x, device id 0x%x ifnum:%d",
745             le16_to_cpu(usbdev->descriptor.idVendor),
746             le16_to_cpu(usbdev->descriptor.idProduct),
747             intf->altsetting->desc.bInterfaceNumber);
748
749         /* We don't handle multiple configurations */
750         if (usbdev->descriptor.bNumConfigurations != 1)
751                 return -ENODEV;
752
753         if (intf->altsetting->desc.bInterfaceNumber != _DABUSB_IF &&
754             le16_to_cpu(usbdev->descriptor.idProduct) == 0x9999)
755                 return -ENODEV;
756
757
758
759         s = &dabusb[intf->minor];
760
761         mutex_lock(&s->mutex);
762         s->remove_pending = 0;
763         s->usbdev = usbdev;
764         s->devnum = intf->minor;
765
766         if (usb_reset_configuration (usbdev) < 0) {
767                 err("reset_configuration failed");
768                 goto reject;
769         }
770         if (le16_to_cpu(usbdev->descriptor.idProduct) == 0x2131) {
771                 dabusb_loadmem (s, NULL);
772                 goto reject;
773         }
774         else {
775                 dabusb_fpga_download (s, NULL);
776
777                 if (usb_set_interface (s->usbdev, _DABUSB_IF, 0) < 0) {
778                         err("set_interface failed");
779                         goto reject;
780                 }
781         }
782         dbg("bound to interface: %d", intf->altsetting->desc.bInterfaceNumber);
783         usb_set_intfdata (intf, s);
784         mutex_unlock(&s->mutex);
785
786         retval = usb_register_dev(intf, &dabusb_class);
787         if (retval) {
788                 usb_set_intfdata (intf, NULL);
789                 return -ENOMEM;
790         }
791
792         return 0;
793
794       reject:
795         mutex_unlock(&s->mutex);
796         s->usbdev = NULL;
797         return -ENODEV;
798 }
799
800 static void dabusb_disconnect (struct usb_interface *intf)
801 {
802         wait_queue_t __wait;
803         pdabusb_t s = usb_get_intfdata (intf);
804
805         dbg("dabusb_disconnect");
806
807         init_waitqueue_entry(&__wait, current);
808
809         usb_set_intfdata (intf, NULL);
810         if (s) {
811                 usb_deregister_dev (intf, &dabusb_class);
812                 s->remove_pending = 1;
813                 wake_up (&s->wait);
814                 add_wait_queue(&s->remove_ok, &__wait);
815                 set_current_state(TASK_UNINTERRUPTIBLE);
816                 if (s->state == _started)
817                         schedule();
818                 current->state = TASK_RUNNING;
819                 remove_wait_queue(&s->remove_ok, &__wait);
820
821                 s->usbdev = NULL;
822                 s->overruns = 0;
823         }
824 }
825
826 static struct usb_device_id dabusb_ids [] = {
827         // { USB_DEVICE(0x0547, 0x2131) },      /* An2131 chip, no boot ROM */
828         { USB_DEVICE(0x0547, 0x9999) },
829         { }                                             /* Terminating entry */
830 };
831
832 MODULE_DEVICE_TABLE (usb, dabusb_ids);
833
834 static struct usb_driver dabusb_driver = {
835         .name =         "dabusb",
836         .probe =        dabusb_probe,
837         .disconnect =   dabusb_disconnect,
838         .id_table =     dabusb_ids,
839 };
840
841 /* --------------------------------------------------------------------- */
842
843 static int __init dabusb_init (void)
844 {
845         int retval;
846         unsigned u;
847
848         /* initialize struct */
849         for (u = 0; u < NRDABUSB; u++) {
850                 pdabusb_t s = &dabusb[u];
851                 memset (s, 0, sizeof (dabusb_t));
852                 mutex_init (&s->mutex);
853                 s->usbdev = NULL;
854                 s->total_buffer_size = buffers;
855                 init_waitqueue_head (&s->wait);
856                 init_waitqueue_head (&s->remove_ok);
857                 spin_lock_init (&s->lock);
858                 INIT_LIST_HEAD (&s->free_buff_list);
859                 INIT_LIST_HEAD (&s->rec_buff_list);
860         }
861
862         /* register misc device */
863         retval = usb_register(&dabusb_driver);
864         if (retval)
865                 goto out;
866
867         dbg("dabusb_init: driver registered");
868
869         info(DRIVER_VERSION ":" DRIVER_DESC);
870
871 out:
872         return retval;
873 }
874
875 static void __exit dabusb_cleanup (void)
876 {
877         dbg("dabusb_cleanup");
878
879         usb_deregister (&dabusb_driver);
880 }
881
882 /* --------------------------------------------------------------------- */
883
884 MODULE_AUTHOR( DRIVER_AUTHOR );
885 MODULE_DESCRIPTION( DRIVER_DESC );
886 MODULE_LICENSE("GPL");
887
888 module_param(buffers, int, 0);
889 MODULE_PARM_DESC (buffers, "Number of buffers (default=256)");
890
891 module_init (dabusb_init);
892 module_exit (dabusb_cleanup);
893
894 /* --------------------------------------------------------------------- */