Merge commit 'upstream/master'
[linux-2.6] / drivers / media / video / em28xx / em28xx-video.c
1 /*
2    em28xx-video.c - driver for Empia EM2800/EM2820/2840 USB
3                     video capture devices
4
5    Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
6                       Markus Rechberger <mrechberger@gmail.com>
7                       Mauro Carvalho Chehab <mchehab@infradead.org>
8                       Sascha Sommer <saschasommer@freenet.de>
9
10         Some parts based on SN9C10x PC Camera Controllers GPL driver made
11                 by Luca Risolia <luca.risolia@studio.unibo.it>
12
13    This program is free software; you can redistribute it and/or modify
14    it under the terms of the GNU General Public License as published by
15    the Free Software Foundation; either version 2 of the License, or
16    (at your option) any later version.
17
18    This program is distributed in the hope that it will be useful,
19    but WITHOUT ANY WARRANTY; without even the implied warranty of
20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21    GNU General Public License for more details.
22
23    You should have received a copy of the GNU General Public License
24    along with this program; if not, write to the Free Software
25    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26  */
27
28 #include <linux/init.h>
29 #include <linux/list.h>
30 #include <linux/module.h>
31 #include <linux/kernel.h>
32 #include <linux/bitmap.h>
33 #include <linux/usb.h>
34 #include <linux/i2c.h>
35 #include <linux/version.h>
36 #include <linux/mm.h>
37 #include <linux/mutex.h>
38
39 #include "em28xx.h"
40 #include <media/v4l2-common.h>
41 #include <media/msp3400.h>
42 #include <media/tuner.h>
43
44 #define DRIVER_AUTHOR "Ludovico Cavedon <cavedon@sssup.it>, " \
45                       "Markus Rechberger <mrechberger@gmail.com>, " \
46                       "Mauro Carvalho Chehab <mchehab@infradead.org>, " \
47                       "Sascha Sommer <saschasommer@freenet.de>"
48
49 #define DRIVER_NAME         "em28xx"
50 #define DRIVER_DESC         "Empia em28xx based USB video device driver"
51 #define EM28XX_VERSION_CODE  KERNEL_VERSION(0, 1, 0)
52
53 #define em28xx_videodbg(fmt, arg...) do {\
54         if (video_debug) \
55                 printk(KERN_INFO "%s %s :"fmt, \
56                          dev->name, __func__ , ##arg); } while (0)
57
58 static unsigned int isoc_debug;
59 module_param(isoc_debug, int, 0644);
60 MODULE_PARM_DESC(isoc_debug, "enable debug messages [isoc transfers]");
61
62 #define em28xx_isocdbg(fmt, arg...) \
63 do {\
64         if (isoc_debug) { \
65                 printk(KERN_INFO "%s %s :"fmt, \
66                          dev->name, __func__ , ##arg); \
67         } \
68   } while (0)
69
70 MODULE_AUTHOR(DRIVER_AUTHOR);
71 MODULE_DESCRIPTION(DRIVER_DESC);
72 MODULE_LICENSE("GPL");
73
74 static LIST_HEAD(em28xx_devlist);
75
76 static unsigned int card[]     = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
77 static unsigned int video_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
78 static unsigned int vbi_nr[]   = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
79 static unsigned int radio_nr[] = {[0 ... (EM28XX_MAXBOARDS - 1)] = UNSET };
80
81 module_param_array(card,  int, NULL, 0444);
82 module_param_array(video_nr, int, NULL, 0444);
83 module_param_array(vbi_nr, int, NULL, 0444);
84 module_param_array(radio_nr, int, NULL, 0444);
85 MODULE_PARM_DESC(card,     "card type");
86 MODULE_PARM_DESC(video_nr, "video device numbers");
87 MODULE_PARM_DESC(vbi_nr,   "vbi device numbers");
88 MODULE_PARM_DESC(radio_nr, "radio device numbers");
89
90 static unsigned int video_debug;
91 module_param(video_debug, int, 0644);
92 MODULE_PARM_DESC(video_debug, "enable debug messages [video]");
93
94 /* Bitmask marking allocated devices from 0 to EM28XX_MAXBOARDS */
95 static unsigned long em28xx_devused;
96
97 /* supported controls */
98 /* Common to all boards */
99 static struct v4l2_queryctrl em28xx_qctrl[] = {
100         {
101                 .id = V4L2_CID_AUDIO_VOLUME,
102                 .type = V4L2_CTRL_TYPE_INTEGER,
103                 .name = "Volume",
104                 .minimum = 0x0,
105                 .maximum = 0x1f,
106                 .step = 0x1,
107                 .default_value = 0x1f,
108                 .flags = 0,
109         }, {
110                 .id = V4L2_CID_AUDIO_MUTE,
111                 .type = V4L2_CTRL_TYPE_BOOLEAN,
112                 .name = "Mute",
113                 .minimum = 0,
114                 .maximum = 1,
115                 .step = 1,
116                 .default_value = 1,
117                 .flags = 0,
118         }
119 };
120
121 static struct usb_driver em28xx_usb_driver;
122
123 /* ------------------------------------------------------------------
124         DMA and thread functions
125    ------------------------------------------------------------------*/
126
127 /*
128  * Announces that a buffer were filled and request the next
129  */
130 static inline void buffer_filled(struct em28xx *dev,
131                                   struct em28xx_dmaqueue *dma_q,
132                                   struct em28xx_buffer *buf)
133 {
134         /* Advice that buffer was filled */
135         em28xx_isocdbg("[%p/%d] wakeup\n", buf, buf->vb.i);
136         buf->vb.state = VIDEOBUF_DONE;
137         buf->vb.field_count++;
138         do_gettimeofday(&buf->vb.ts);
139
140         dev->isoc_ctl.buf = NULL;
141
142         list_del(&buf->vb.queue);
143         wake_up(&buf->vb.done);
144 }
145
146 /*
147  * Identify the buffer header type and properly handles
148  */
149 static void em28xx_copy_video(struct em28xx *dev,
150                               struct em28xx_dmaqueue  *dma_q,
151                               struct em28xx_buffer *buf,
152                               unsigned char *p,
153                               unsigned char *outp, unsigned long len)
154 {
155         void *fieldstart, *startwrite, *startread;
156         int  linesdone, currlinedone, offset, lencopy, remain;
157         int bytesperline = dev->width << 1;
158
159         if (dma_q->pos + len > buf->vb.size)
160                 len = buf->vb.size - dma_q->pos;
161
162         if (p[0] != 0x88 && p[0] != 0x22) {
163                 em28xx_isocdbg("frame is not complete\n");
164                 len += 4;
165         } else
166                 p += 4;
167
168         startread = p;
169         remain = len;
170
171         /* Interlaces frame */
172         if (buf->top_field)
173                 fieldstart = outp;
174         else
175                 fieldstart = outp + bytesperline;
176
177         linesdone = dma_q->pos / bytesperline;
178         currlinedone = dma_q->pos % bytesperline;
179         offset = linesdone * bytesperline * 2 + currlinedone;
180         startwrite = fieldstart + offset;
181         lencopy = bytesperline - currlinedone;
182         lencopy = lencopy > remain ? remain : lencopy;
183
184         if ((char *)startwrite + lencopy > (char *)outp + buf->vb.size) {
185                 em28xx_isocdbg("Overflow of %zi bytes past buffer end (1)\n",
186                                ((char *)startwrite + lencopy) -
187                                ((char *)outp + buf->vb.size));
188                 lencopy = remain = (char *)outp + buf->vb.size - (char *)startwrite;
189         }
190         if (lencopy <= 0)
191                 return;
192         memcpy(startwrite, startread, lencopy);
193
194         remain -= lencopy;
195
196         while (remain > 0) {
197                 startwrite += lencopy + bytesperline;
198                 startread += lencopy;
199                 if (bytesperline > remain)
200                         lencopy = remain;
201                 else
202                         lencopy = bytesperline;
203
204                 if ((char *)startwrite + lencopy > (char *)outp + buf->vb.size) {
205                         em28xx_isocdbg("Overflow of %zi bytes past buffer end (2)\n",
206                                        ((char *)startwrite + lencopy) -
207                                        ((char *)outp + buf->vb.size));
208                         lencopy = remain = (char *)outp + buf->vb.size -
209                                            (char *)startwrite;
210                 }
211                 if (lencopy <= 0)
212                         break;
213
214                 memcpy(startwrite, startread, lencopy);
215
216                 remain -= lencopy;
217         }
218
219         dma_q->pos += len;
220 }
221
222 static inline void print_err_status(struct em28xx *dev,
223                                      int packet, int status)
224 {
225         char *errmsg = "Unknown";
226
227         switch (status) {
228         case -ENOENT:
229                 errmsg = "unlinked synchronuously";
230                 break;
231         case -ECONNRESET:
232                 errmsg = "unlinked asynchronuously";
233                 break;
234         case -ENOSR:
235                 errmsg = "Buffer error (overrun)";
236                 break;
237         case -EPIPE:
238                 errmsg = "Stalled (device not responding)";
239                 break;
240         case -EOVERFLOW:
241                 errmsg = "Babble (bad cable?)";
242                 break;
243         case -EPROTO:
244                 errmsg = "Bit-stuff error (bad cable?)";
245                 break;
246         case -EILSEQ:
247                 errmsg = "CRC/Timeout (could be anything)";
248                 break;
249         case -ETIME:
250                 errmsg = "Device does not respond";
251                 break;
252         }
253         if (packet < 0) {
254                 em28xx_isocdbg("URB status %d [%s].\n", status, errmsg);
255         } else {
256                 em28xx_isocdbg("URB packet %d, status %d [%s].\n",
257                                packet, status, errmsg);
258         }
259 }
260
261 /*
262  * video-buf generic routine to get the next available buffer
263  */
264 static inline void get_next_buf(struct em28xx_dmaqueue *dma_q,
265                                           struct em28xx_buffer **buf)
266 {
267         struct em28xx *dev = container_of(dma_q, struct em28xx, vidq);
268         char *outp;
269
270         if (list_empty(&dma_q->active)) {
271                 em28xx_isocdbg("No active queue to serve\n");
272                 dev->isoc_ctl.buf = NULL;
273                 *buf = NULL;
274                 return;
275         }
276
277         /* Get the next buffer */
278         *buf = list_entry(dma_q->active.next, struct em28xx_buffer, vb.queue);
279
280         /* Cleans up buffer - Usefull for testing for frame/URB loss */
281         outp = videobuf_to_vmalloc(&(*buf)->vb);
282         memset(outp, 0, (*buf)->vb.size);
283
284         dev->isoc_ctl.buf = *buf;
285
286         return;
287 }
288
289 /*
290  * Controls the isoc copy of each urb packet
291  */
292 static inline int em28xx_isoc_copy(struct em28xx *dev, struct urb *urb)
293 {
294         struct em28xx_buffer    *buf;
295         struct em28xx_dmaqueue  *dma_q = urb->context;
296         unsigned char *outp = NULL;
297         int i, len = 0, rc = 1;
298         unsigned char *p;
299
300         if (!dev)
301                 return 0;
302
303         if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
304                 return 0;
305
306         if (urb->status < 0) {
307                 print_err_status(dev, -1, urb->status);
308                 if (urb->status == -ENOENT)
309                         return 0;
310         }
311
312         buf = dev->isoc_ctl.buf;
313         if (buf != NULL)
314                 outp = videobuf_to_vmalloc(&buf->vb);
315
316         for (i = 0; i < urb->number_of_packets; i++) {
317                 int status = urb->iso_frame_desc[i].status;
318
319                 if (status < 0) {
320                         print_err_status(dev, i, status);
321                         if (urb->iso_frame_desc[i].status != -EPROTO)
322                                 continue;
323                 }
324
325                 len = urb->iso_frame_desc[i].actual_length - 4;
326
327                 if (urb->iso_frame_desc[i].actual_length <= 0) {
328                         /* em28xx_isocdbg("packet %d is empty",i); - spammy */
329                         continue;
330                 }
331                 if (urb->iso_frame_desc[i].actual_length >
332                                                 dev->max_pkt_size) {
333                         em28xx_isocdbg("packet bigger than packet size");
334                         continue;
335                 }
336
337                 p = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
338
339                 /* FIXME: incomplete buffer checks where removed to make
340                    logic simpler. Impacts of those changes should be evaluated
341                  */
342                 if (p[0] == 0x33 && p[1] == 0x95 && p[2] == 0x00) {
343                         em28xx_isocdbg("VBI HEADER!!!\n");
344                         /* FIXME: Should add vbi copy */
345                         continue;
346                 }
347                 if (p[0] == 0x22 && p[1] == 0x5a) {
348                         em28xx_isocdbg("Video frame %d, length=%i, %s\n", p[2],
349                                        len, (p[2] & 1)? "odd" : "even");
350
351                         if (!(p[2] & 1)) {
352                                 if (buf != NULL)
353                                         buffer_filled(dev, dma_q, buf);
354                                 get_next_buf(dma_q, &buf);
355                                 if (buf == NULL)
356                                         outp = NULL;
357                                 else
358                                         outp = videobuf_to_vmalloc(&buf->vb);
359                         }
360
361                         if (buf != NULL) {
362                                 if (p[2] & 1)
363                                         buf->top_field = 0;
364                                 else
365                                         buf->top_field = 1;
366                         }
367
368                         dma_q->pos = 0;
369                 }
370                 if (buf != NULL)
371                         em28xx_copy_video(dev, dma_q, buf, p, outp, len);
372         }
373         return rc;
374 }
375
376 /* ------------------------------------------------------------------
377         Videobuf operations
378    ------------------------------------------------------------------*/
379
380 static int
381 buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
382 {
383         struct em28xx_fh *fh = vq->priv_data;
384         struct em28xx        *dev = fh->dev;
385         struct v4l2_frequency f;
386
387         *size = 16 * fh->dev->width * fh->dev->height >> 3;
388         if (0 == *count)
389                 *count = EM28XX_DEF_BUF;
390
391         if (*count < EM28XX_MIN_BUF)
392                 *count = EM28XX_MIN_BUF;
393
394         /* Ask tuner to go to analog mode */
395         memset(&f, 0, sizeof(f));
396         f.frequency = dev->ctl_freq;
397
398         em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, &f);
399
400         return 0;
401 }
402
403 /* This is called *without* dev->slock held; please keep it that way */
404 static void free_buffer(struct videobuf_queue *vq, struct em28xx_buffer *buf)
405 {
406         struct em28xx_fh     *fh  = vq->priv_data;
407         struct em28xx        *dev = fh->dev;
408         unsigned long flags = 0;
409         if (in_interrupt())
410                 BUG();
411
412         /* We used to wait for the buffer to finish here, but this didn't work
413            because, as we were keeping the state as VIDEOBUF_QUEUED,
414            videobuf_queue_cancel marked it as finished for us.
415            (Also, it could wedge forever if the hardware was misconfigured.)
416
417            This should be safe; by the time we get here, the buffer isn't
418            queued anymore. If we ever start marking the buffers as
419            VIDEOBUF_ACTIVE, it won't be, though.
420         */
421         spin_lock_irqsave(&dev->slock, flags);
422         if (dev->isoc_ctl.buf == buf)
423                 dev->isoc_ctl.buf = NULL;
424         spin_unlock_irqrestore(&dev->slock, flags);
425
426         videobuf_vmalloc_free(&buf->vb);
427         buf->vb.state = VIDEOBUF_NEEDS_INIT;
428 }
429
430 static int
431 buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
432                                                 enum v4l2_field field)
433 {
434         struct em28xx_fh     *fh  = vq->priv_data;
435         struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
436         struct em28xx        *dev = fh->dev;
437         int                  rc = 0, urb_init = 0;
438
439         /* FIXME: It assumes depth = 16 */
440         /* The only currently supported format is 16 bits/pixel */
441         buf->vb.size = 16 * dev->width * dev->height >> 3;
442
443         if (0 != buf->vb.baddr  &&  buf->vb.bsize < buf->vb.size)
444                 return -EINVAL;
445
446         buf->vb.width  = dev->width;
447         buf->vb.height = dev->height;
448         buf->vb.field  = field;
449
450         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
451                 rc = videobuf_iolock(vq, &buf->vb, NULL);
452                 if (rc < 0)
453                         goto fail;
454         }
455
456         if (!dev->isoc_ctl.num_bufs)
457                 urb_init = 1;
458
459         if (urb_init) {
460                 rc = em28xx_init_isoc(dev, EM28XX_NUM_PACKETS,
461                                       EM28XX_NUM_BUFS, dev->max_pkt_size,
462                                       em28xx_isoc_copy);
463                 if (rc < 0)
464                         goto fail;
465         }
466
467         buf->vb.state = VIDEOBUF_PREPARED;
468         return 0;
469
470 fail:
471         free_buffer(vq, buf);
472         return rc;
473 }
474
475 static void
476 buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
477 {
478         struct em28xx_buffer    *buf     = container_of(vb, struct em28xx_buffer, vb);
479         struct em28xx_fh        *fh      = vq->priv_data;
480         struct em28xx           *dev     = fh->dev;
481         struct em28xx_dmaqueue  *vidq    = &dev->vidq;
482
483         buf->vb.state = VIDEOBUF_QUEUED;
484         list_add_tail(&buf->vb.queue, &vidq->active);
485
486 }
487
488 static void buffer_release(struct videobuf_queue *vq,
489                                 struct videobuf_buffer *vb)
490 {
491         struct em28xx_buffer   *buf  = container_of(vb, struct em28xx_buffer, vb);
492         struct em28xx_fh       *fh   = vq->priv_data;
493         struct em28xx          *dev  = (struct em28xx *)fh->dev;
494
495         em28xx_isocdbg("em28xx: called buffer_release\n");
496
497         free_buffer(vq, buf);
498 }
499
500 static struct videobuf_queue_ops em28xx_video_qops = {
501         .buf_setup      = buffer_setup,
502         .buf_prepare    = buffer_prepare,
503         .buf_queue      = buffer_queue,
504         .buf_release    = buffer_release,
505 };
506
507 /*********************  v4l2 interface  **************************************/
508
509 /*
510  * em28xx_config()
511  * inits registers with sane defaults
512  */
513 static int em28xx_config(struct em28xx *dev)
514 {
515
516         /* Sets I2C speed to 100 KHz */
517         if (!dev->is_em2800)
518                 em28xx_write_regs_req(dev, 0x00, 0x06, "\x40", 1);
519
520         /* enable vbi capturing */
521
522 /*      em28xx_write_regs_req(dev, 0x00, 0x0e, "\xC0", 1); audio register */
523 /*      em28xx_write_regs_req(dev, 0x00, 0x0f, "\x80", 1); clk register */
524         em28xx_write_regs_req(dev, 0x00, 0x11, "\x51", 1);
525
526         dev->mute = 1;          /* maybe not the right place... */
527         dev->volume = 0x1f;
528
529         em28xx_outfmt_set_yuv422(dev);
530         em28xx_colorlevels_set_default(dev);
531         em28xx_compression_disable(dev);
532
533         return 0;
534 }
535
536 /*
537  * em28xx_config_i2c()
538  * configure i2c attached devices
539  */
540 static void em28xx_config_i2c(struct em28xx *dev)
541 {
542         struct v4l2_routing route;
543
544         route.input = INPUT(dev->ctl_input)->vmux;
545         route.output = 0;
546         em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, NULL);
547         em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
548         em28xx_i2c_call_clients(dev, VIDIOC_STREAMON, NULL);
549 }
550
551 static void video_mux(struct em28xx *dev, int index)
552 {
553         struct v4l2_routing route;
554
555         route.input = INPUT(index)->vmux;
556         route.output = 0;
557         dev->ctl_input = index;
558         dev->ctl_ainput = INPUT(index)->amux;
559
560         em28xx_i2c_call_clients(dev, VIDIOC_INT_S_VIDEO_ROUTING, &route);
561
562         if (dev->has_msp34xx) {
563                 if (dev->i2s_speed) {
564                         em28xx_i2c_call_clients(dev, VIDIOC_INT_I2S_CLOCK_FREQ,
565                                 &dev->i2s_speed);
566                 }
567                 route.input = dev->ctl_ainput;
568                 route.output = MSP_OUTPUT(MSP_SC_IN_DSP_SCART1);
569                 /* Note: this is msp3400 specific */
570                 em28xx_i2c_call_clients(dev, VIDIOC_INT_S_AUDIO_ROUTING,
571                         &route);
572         }
573
574         em28xx_audio_analog_set(dev);
575 }
576
577 /* Usage lock check functions */
578 static int res_get(struct em28xx_fh *fh)
579 {
580         struct em28xx    *dev = fh->dev;
581         int              rc   = 0;
582
583         /* This instance already has stream_on */
584         if (fh->stream_on)
585                 return rc;
586
587         if (dev->stream_on)
588                 return -EINVAL;
589
590         mutex_lock(&dev->lock);
591         dev->stream_on = 1;
592         fh->stream_on  = 1;
593         mutex_unlock(&dev->lock);
594         return rc;
595 }
596
597 static int res_check(struct em28xx_fh *fh)
598 {
599         return (fh->stream_on);
600 }
601
602 static void res_free(struct em28xx_fh *fh)
603 {
604         struct em28xx    *dev = fh->dev;
605
606         mutex_lock(&dev->lock);
607         fh->stream_on = 0;
608         dev->stream_on = 0;
609         mutex_unlock(&dev->lock);
610 }
611
612 /*
613  * em28xx_get_ctrl()
614  * return the current saturation, brightness or contrast, mute state
615  */
616 static int em28xx_get_ctrl(struct em28xx *dev, struct v4l2_control *ctrl)
617 {
618         switch (ctrl->id) {
619         case V4L2_CID_AUDIO_MUTE:
620                 ctrl->value = dev->mute;
621                 return 0;
622         case V4L2_CID_AUDIO_VOLUME:
623                 ctrl->value = dev->volume;
624                 return 0;
625         default:
626                 return -EINVAL;
627         }
628 }
629
630 /*
631  * em28xx_set_ctrl()
632  * mute or set new saturation, brightness or contrast
633  */
634 static int em28xx_set_ctrl(struct em28xx *dev, const struct v4l2_control *ctrl)
635 {
636         switch (ctrl->id) {
637         case V4L2_CID_AUDIO_MUTE:
638                 if (ctrl->value != dev->mute) {
639                         dev->mute = ctrl->value;
640                         return em28xx_audio_analog_set(dev);
641                 }
642                 return 0;
643         case V4L2_CID_AUDIO_VOLUME:
644                 dev->volume = ctrl->value;
645                 return em28xx_audio_analog_set(dev);
646         default:
647                 return -EINVAL;
648         }
649 }
650
651 static int check_dev(struct em28xx *dev)
652 {
653         if (dev->state & DEV_DISCONNECTED) {
654                 em28xx_errdev("v4l2 ioctl: device not present\n");
655                 return -ENODEV;
656         }
657
658         if (dev->state & DEV_MISCONFIGURED) {
659                 em28xx_errdev("v4l2 ioctl: device is misconfigured; "
660                               "close and open it again\n");
661                 return -EIO;
662         }
663         return 0;
664 }
665
666 static void get_scale(struct em28xx *dev,
667                         unsigned int width, unsigned int height,
668                         unsigned int *hscale, unsigned int *vscale)
669 {
670         unsigned int          maxw   = norm_maxw(dev);
671         unsigned int          maxh   = norm_maxh(dev);
672
673         *hscale = (((unsigned long)maxw) << 12) / width - 4096L;
674         if (*hscale >= 0x4000)
675                 *hscale = 0x3fff;
676
677         *vscale = (((unsigned long)maxh) << 12) / height - 4096L;
678         if (*vscale >= 0x4000)
679                 *vscale = 0x3fff;
680 }
681
682 /* ------------------------------------------------------------------
683         IOCTL vidioc handling
684    ------------------------------------------------------------------*/
685
686 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
687                                         struct v4l2_format *f)
688 {
689         struct em28xx_fh      *fh  = priv;
690         struct em28xx         *dev = fh->dev;
691
692         mutex_lock(&dev->lock);
693
694         f->fmt.pix.width = dev->width;
695         f->fmt.pix.height = dev->height;
696         f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
697         f->fmt.pix.bytesperline = dev->width * 2;
698         f->fmt.pix.sizeimage = f->fmt.pix.bytesperline  * dev->height;
699         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
700
701         /* FIXME: TOP? NONE? BOTTOM? ALTENATE? */
702         f->fmt.pix.field = dev->interlaced ?
703                            V4L2_FIELD_INTERLACED : V4L2_FIELD_TOP;
704
705         mutex_unlock(&dev->lock);
706         return 0;
707 }
708
709 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
710                         struct v4l2_format *f)
711 {
712         struct em28xx_fh      *fh    = priv;
713         struct em28xx         *dev   = fh->dev;
714         int                   width  = f->fmt.pix.width;
715         int                   height = f->fmt.pix.height;
716         unsigned int          maxw   = norm_maxw(dev);
717         unsigned int          maxh   = norm_maxh(dev);
718         unsigned int          hscale, vscale;
719
720         /* width must even because of the YUYV format
721            height must be even because of interlacing */
722         height &= 0xfffe;
723         width &= 0xfffe;
724
725         if (height < 32)
726                 height = 32;
727         if (height > maxh)
728                 height = maxh;
729         if (width < 48)
730                 width = 48;
731         if (width > maxw)
732                 width = maxw;
733
734         mutex_lock(&dev->lock);
735
736         if (dev->is_em2800) {
737                 /* the em2800 can only scale down to 50% */
738                 if (height % (maxh / 2))
739                         height = maxh;
740                 if (width % (maxw / 2))
741                         width = maxw;
742                 /* according to empiatech support */
743                 /* the MaxPacketSize is to small to support */
744                 /* framesizes larger than 640x480 @ 30 fps */
745                 /* or 640x576 @ 25 fps. As this would cut */
746                 /* of a part of the image we prefer */
747                 /* 360x576 or 360x480 for now */
748                 if (width == maxw && height == maxh)
749                         width /= 2;
750         }
751
752         get_scale(dev, width, height, &hscale, &vscale);
753
754         width = (((unsigned long)maxw) << 12) / (hscale + 4096L);
755         height = (((unsigned long)maxh) << 12) / (vscale + 4096L);
756
757         f->fmt.pix.width = width;
758         f->fmt.pix.height = height;
759         f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
760         f->fmt.pix.bytesperline = width * 2;
761         f->fmt.pix.sizeimage = width * 2 * height;
762         f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
763         f->fmt.pix.field = V4L2_FIELD_INTERLACED;
764
765         mutex_unlock(&dev->lock);
766         return 0;
767 }
768
769 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
770                         struct v4l2_format *f)
771 {
772         struct em28xx_fh      *fh  = priv;
773         struct em28xx         *dev = fh->dev;
774         int                   rc;
775
776         rc = check_dev(dev);
777         if (rc < 0)
778                 return rc;
779
780         vidioc_try_fmt_vid_cap(file, priv, f);
781
782         mutex_lock(&dev->lock);
783
784         if (videobuf_queue_is_busy(&fh->vb_vidq)) {
785                 em28xx_errdev("%s queue busy\n", __func__);
786                 rc = -EBUSY;
787                 goto out;
788         }
789
790         if (dev->stream_on && !fh->stream_on) {
791                 em28xx_errdev("%s device in use by another fh\n", __func__);
792                 rc = -EBUSY;
793                 goto out;
794         }
795
796         /* set new image size */
797         dev->width = f->fmt.pix.width;
798         dev->height = f->fmt.pix.height;
799         get_scale(dev, dev->width, dev->height, &dev->hscale, &dev->vscale);
800
801         em28xx_set_alternate(dev);
802         em28xx_resolution_set(dev);
803
804         rc = 0;
805
806 out:
807         mutex_unlock(&dev->lock);
808         return rc;
809 }
810
811 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id * norm)
812 {
813         struct em28xx_fh   *fh  = priv;
814         struct em28xx      *dev = fh->dev;
815         struct v4l2_format f;
816         int                rc;
817
818         rc = check_dev(dev);
819         if (rc < 0)
820                 return rc;
821
822         mutex_lock(&dev->lock);
823         dev->norm = *norm;
824         mutex_unlock(&dev->lock);
825
826         /* Adjusts width/height, if needed */
827         f.fmt.pix.width = dev->width;
828         f.fmt.pix.height = dev->height;
829         vidioc_try_fmt_vid_cap(file, priv, &f);
830
831         mutex_lock(&dev->lock);
832
833         /* set new image size */
834         dev->width = f.fmt.pix.width;
835         dev->height = f.fmt.pix.height;
836         get_scale(dev, dev->width, dev->height, &dev->hscale, &dev->vscale);
837
838         em28xx_resolution_set(dev);
839         em28xx_i2c_call_clients(dev, VIDIOC_S_STD, &dev->norm);
840
841         mutex_unlock(&dev->lock);
842         return 0;
843 }
844
845 static const char *iname[] = {
846         [EM28XX_VMUX_COMPOSITE1] = "Composite1",
847         [EM28XX_VMUX_COMPOSITE2] = "Composite2",
848         [EM28XX_VMUX_COMPOSITE3] = "Composite3",
849         [EM28XX_VMUX_COMPOSITE4] = "Composite4",
850         [EM28XX_VMUX_SVIDEO]     = "S-Video",
851         [EM28XX_VMUX_TELEVISION] = "Television",
852         [EM28XX_VMUX_CABLE]      = "Cable TV",
853         [EM28XX_VMUX_DVB]        = "DVB",
854         [EM28XX_VMUX_DEBUG]      = "for debug only",
855 };
856
857 static int vidioc_enum_input(struct file *file, void *priv,
858                                 struct v4l2_input *i)
859 {
860         struct em28xx_fh   *fh  = priv;
861         struct em28xx      *dev = fh->dev;
862         unsigned int       n;
863
864         n = i->index;
865         if (n >= MAX_EM28XX_INPUT)
866                 return -EINVAL;
867         if (0 == INPUT(n)->type)
868                 return -EINVAL;
869
870         i->index = n;
871         i->type = V4L2_INPUT_TYPE_CAMERA;
872
873         strcpy(i->name, iname[INPUT(n)->type]);
874
875         if ((EM28XX_VMUX_TELEVISION == INPUT(n)->type) ||
876                 (EM28XX_VMUX_CABLE == INPUT(n)->type))
877                 i->type = V4L2_INPUT_TYPE_TUNER;
878
879         i->std = dev->vdev->tvnorms;
880
881         return 0;
882 }
883
884 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
885 {
886         struct em28xx_fh   *fh  = priv;
887         struct em28xx      *dev = fh->dev;
888
889         *i = dev->ctl_input;
890
891         return 0;
892 }
893
894 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
895 {
896         struct em28xx_fh   *fh  = priv;
897         struct em28xx      *dev = fh->dev;
898         int                rc;
899
900         rc = check_dev(dev);
901         if (rc < 0)
902                 return rc;
903
904         if (i >= MAX_EM28XX_INPUT)
905                 return -EINVAL;
906         if (0 == INPUT(i)->type)
907                 return -EINVAL;
908
909         mutex_lock(&dev->lock);
910
911         video_mux(dev, i);
912
913         mutex_unlock(&dev->lock);
914         return 0;
915 }
916
917 static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
918 {
919         struct em28xx_fh   *fh    = priv;
920         struct em28xx      *dev   = fh->dev;
921         unsigned int        index = a->index;
922
923         if (a->index > 1)
924                 return -EINVAL;
925
926         index = dev->ctl_ainput;
927
928         if (index == 0)
929                 strcpy(a->name, "Television");
930         else
931                 strcpy(a->name, "Line In");
932
933         a->capability = V4L2_AUDCAP_STEREO;
934         a->index = index;
935
936         return 0;
937 }
938
939 static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a)
940 {
941         struct em28xx_fh   *fh  = priv;
942         struct em28xx      *dev = fh->dev;
943
944         if (a->index != dev->ctl_ainput)
945                 return -EINVAL;
946
947         return 0;
948 }
949
950 static int vidioc_queryctrl(struct file *file, void *priv,
951                                 struct v4l2_queryctrl *qc)
952 {
953         struct em28xx_fh      *fh  = priv;
954         struct em28xx         *dev = fh->dev;
955         int                   id  = qc->id;
956         int                   i;
957         int                   rc;
958
959         rc = check_dev(dev);
960         if (rc < 0)
961                 return rc;
962
963         memset(qc, 0, sizeof(*qc));
964
965         qc->id = id;
966
967         if (!dev->has_msp34xx) {
968                 for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
969                         if (qc->id && qc->id == em28xx_qctrl[i].id) {
970                                 memcpy(qc, &(em28xx_qctrl[i]), sizeof(*qc));
971                                 return 0;
972                         }
973                 }
974         }
975         mutex_lock(&dev->lock);
976         em28xx_i2c_call_clients(dev, VIDIOC_QUERYCTRL, qc);
977         mutex_unlock(&dev->lock);
978
979         if (qc->type)
980                 return 0;
981         else
982                 return -EINVAL;
983 }
984
985 static int vidioc_g_ctrl(struct file *file, void *priv,
986                                 struct v4l2_control *ctrl)
987 {
988         struct em28xx_fh      *fh  = priv;
989         struct em28xx         *dev = fh->dev;
990         int                   rc;
991
992         rc = check_dev(dev);
993         if (rc < 0)
994                 return rc;
995         mutex_lock(&dev->lock);
996
997         if (!dev->has_msp34xx)
998                 rc = em28xx_get_ctrl(dev, ctrl);
999         else
1000                 rc = -EINVAL;
1001
1002         if (rc == -EINVAL) {
1003                 em28xx_i2c_call_clients(dev, VIDIOC_G_CTRL, ctrl);
1004                 rc = 0;
1005         }
1006
1007         mutex_unlock(&dev->lock);
1008         return rc;
1009 }
1010
1011 static int vidioc_s_ctrl(struct file *file, void *priv,
1012                                 struct v4l2_control *ctrl)
1013 {
1014         struct em28xx_fh      *fh  = priv;
1015         struct em28xx         *dev = fh->dev;
1016         u8                    i;
1017         int                   rc;
1018
1019         rc = check_dev(dev);
1020         if (rc < 0)
1021                 return rc;
1022
1023         mutex_lock(&dev->lock);
1024
1025         if (dev->has_msp34xx)
1026                 em28xx_i2c_call_clients(dev, VIDIOC_S_CTRL, ctrl);
1027         else {
1028                 rc = 1;
1029                 for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
1030                         if (ctrl->id == em28xx_qctrl[i].id) {
1031                                 if (ctrl->value < em28xx_qctrl[i].minimum ||
1032                                     ctrl->value > em28xx_qctrl[i].maximum) {
1033                                         rc = -ERANGE;
1034                                         break;
1035                                 }
1036
1037                                 rc = em28xx_set_ctrl(dev, ctrl);
1038                                 break;
1039                         }
1040                 }
1041         }
1042
1043         /* Control not found - try to send it to the attached devices */
1044         if (rc == 1) {
1045                 em28xx_i2c_call_clients(dev, VIDIOC_S_CTRL, ctrl);
1046                 rc = 0;
1047         }
1048
1049         mutex_unlock(&dev->lock);
1050         return rc;
1051 }
1052
1053 static int vidioc_g_tuner(struct file *file, void *priv,
1054                                 struct v4l2_tuner *t)
1055 {
1056         struct em28xx_fh      *fh  = priv;
1057         struct em28xx         *dev = fh->dev;
1058         int                   rc;
1059
1060         rc = check_dev(dev);
1061         if (rc < 0)
1062                 return rc;
1063
1064         if (0 != t->index)
1065                 return -EINVAL;
1066
1067         strcpy(t->name, "Tuner");
1068
1069         mutex_lock(&dev->lock);
1070
1071         em28xx_i2c_call_clients(dev, VIDIOC_G_TUNER, t);
1072
1073         mutex_unlock(&dev->lock);
1074         return 0;
1075 }
1076
1077 static int vidioc_s_tuner(struct file *file, void *priv,
1078                                 struct v4l2_tuner *t)
1079 {
1080         struct em28xx_fh      *fh  = priv;
1081         struct em28xx         *dev = fh->dev;
1082         int                   rc;
1083
1084         rc = check_dev(dev);
1085         if (rc < 0)
1086                 return rc;
1087
1088         if (0 != t->index)
1089                 return -EINVAL;
1090
1091         mutex_lock(&dev->lock);
1092
1093         em28xx_i2c_call_clients(dev, VIDIOC_S_TUNER, t);
1094
1095         mutex_unlock(&dev->lock);
1096         return 0;
1097 }
1098
1099 static int vidioc_g_frequency(struct file *file, void *priv,
1100                                 struct v4l2_frequency *f)
1101 {
1102         struct em28xx_fh      *fh  = priv;
1103         struct em28xx         *dev = fh->dev;
1104
1105         f->type = fh->radio ? V4L2_TUNER_RADIO : V4L2_TUNER_ANALOG_TV;
1106         f->frequency = dev->ctl_freq;
1107
1108         return 0;
1109 }
1110
1111 static int vidioc_s_frequency(struct file *file, void *priv,
1112                                 struct v4l2_frequency *f)
1113 {
1114         struct em28xx_fh      *fh  = priv;
1115         struct em28xx         *dev = fh->dev;
1116         int                   rc;
1117
1118         rc = check_dev(dev);
1119         if (rc < 0)
1120                 return rc;
1121
1122         if (0 != f->tuner)
1123                 return -EINVAL;
1124
1125         if (unlikely(0 == fh->radio && f->type != V4L2_TUNER_ANALOG_TV))
1126                 return -EINVAL;
1127         if (unlikely(1 == fh->radio && f->type != V4L2_TUNER_RADIO))
1128                 return -EINVAL;
1129
1130         mutex_lock(&dev->lock);
1131
1132         dev->ctl_freq = f->frequency;
1133         em28xx_i2c_call_clients(dev, VIDIOC_S_FREQUENCY, f);
1134
1135         mutex_unlock(&dev->lock);
1136         return 0;
1137 }
1138
1139 #ifdef CONFIG_VIDEO_ADV_DEBUG
1140 static int em28xx_reg_len(int reg)
1141 {
1142         switch (reg) {
1143         case EM28XX_R40_AC97LSB:
1144         case EM28XX_R30_HSCALELOW:
1145         case EM28XX_R32_VSCALELOW:
1146                 return 2;
1147         default:
1148                 return 1;
1149         }
1150 }
1151
1152 static int vidioc_g_register(struct file *file, void *priv,
1153                              struct v4l2_register *reg)
1154 {
1155         struct em28xx_fh      *fh  = priv;
1156         struct em28xx         *dev = fh->dev;
1157         int ret;
1158
1159         if (!v4l2_chip_match_host(reg->match_type, reg->match_chip))
1160                 return -EINVAL;
1161
1162         if (em28xx_reg_len(reg->reg) == 1) {
1163                 ret = em28xx_read_reg(dev, reg->reg);
1164                 if (ret < 0)
1165                         return ret;
1166
1167                 reg->val = ret;
1168         } else {
1169                 __le64 val = 0;
1170                 ret = em28xx_read_reg_req_len(dev, USB_REQ_GET_STATUS,
1171                                                    reg->reg, (char *)&val, 2);
1172                 if (ret < 0)
1173                         return ret;
1174
1175                 reg->val = le64_to_cpu(val);
1176         }
1177
1178         return 0;
1179 }
1180
1181 static int vidioc_s_register(struct file *file, void *priv,
1182                              struct v4l2_register *reg)
1183 {
1184         struct em28xx_fh      *fh  = priv;
1185         struct em28xx         *dev = fh->dev;
1186         __le64 buf;
1187
1188         buf = cpu_to_le64(reg->val);
1189
1190         return em28xx_write_regs(dev, reg->reg, (char *)&buf,
1191                                  em28xx_reg_len(reg->reg));
1192 }
1193 #endif
1194
1195
1196 static int vidioc_cropcap(struct file *file, void *priv,
1197                                         struct v4l2_cropcap *cc)
1198 {
1199         struct em28xx_fh      *fh  = priv;
1200         struct em28xx         *dev = fh->dev;
1201
1202         if (cc->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1203                 return -EINVAL;
1204
1205         cc->bounds.left = 0;
1206         cc->bounds.top = 0;
1207         cc->bounds.width = dev->width;
1208         cc->bounds.height = dev->height;
1209         cc->defrect = cc->bounds;
1210         cc->pixelaspect.numerator = 54; /* 4:3 FIXME: remove magic numbers */
1211         cc->pixelaspect.denominator = 59;
1212
1213         return 0;
1214 }
1215
1216 static int vidioc_streamon(struct file *file, void *priv,
1217                                         enum v4l2_buf_type type)
1218 {
1219         struct em28xx_fh      *fh  = priv;
1220         struct em28xx         *dev = fh->dev;
1221         int                   rc;
1222
1223         rc = check_dev(dev);
1224         if (rc < 0)
1225                 return rc;
1226
1227
1228         if (unlikely(res_get(fh) < 0))
1229                 return -EBUSY;
1230
1231         return (videobuf_streamon(&fh->vb_vidq));
1232 }
1233
1234 static int vidioc_streamoff(struct file *file, void *priv,
1235                                         enum v4l2_buf_type type)
1236 {
1237         struct em28xx_fh      *fh  = priv;
1238         struct em28xx         *dev = fh->dev;
1239         int                   rc;
1240
1241         rc = check_dev(dev);
1242         if (rc < 0)
1243                 return rc;
1244
1245         if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1246                 return -EINVAL;
1247         if (type != fh->type)
1248                 return -EINVAL;
1249
1250         videobuf_streamoff(&fh->vb_vidq);
1251         res_free(fh);
1252
1253         return 0;
1254 }
1255
1256 static int vidioc_querycap(struct file *file, void  *priv,
1257                                         struct v4l2_capability *cap)
1258 {
1259         struct em28xx_fh      *fh  = priv;
1260         struct em28xx         *dev = fh->dev;
1261
1262         strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
1263         strlcpy(cap->card, em28xx_boards[dev->model].name, sizeof(cap->card));
1264         strlcpy(cap->bus_info, dev->udev->dev.bus_id, sizeof(cap->bus_info));
1265
1266         cap->version = EM28XX_VERSION_CODE;
1267
1268         cap->capabilities =
1269                         V4L2_CAP_SLICED_VBI_CAPTURE |
1270                         V4L2_CAP_VIDEO_CAPTURE |
1271                         V4L2_CAP_AUDIO |
1272                         V4L2_CAP_READWRITE | V4L2_CAP_STREAMING;
1273
1274         if (dev->tuner_type != TUNER_ABSENT)
1275                 cap->capabilities |= V4L2_CAP_TUNER;
1276
1277         return 0;
1278 }
1279
1280 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
1281                                         struct v4l2_fmtdesc *fmtd)
1282 {
1283         if (fmtd->index != 0)
1284                 return -EINVAL;
1285
1286         fmtd->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1287         strcpy(fmtd->description, "Packed YUY2");
1288         fmtd->pixelformat = V4L2_PIX_FMT_YUYV;
1289         memset(fmtd->reserved, 0, sizeof(fmtd->reserved));
1290
1291         return 0;
1292 }
1293
1294 /* Sliced VBI ioctls */
1295 static int vidioc_g_fmt_sliced_vbi_cap(struct file *file, void *priv,
1296                                         struct v4l2_format *f)
1297 {
1298         struct em28xx_fh      *fh  = priv;
1299         struct em28xx         *dev = fh->dev;
1300         int                   rc;
1301
1302         rc = check_dev(dev);
1303         if (rc < 0)
1304                 return rc;
1305
1306         mutex_lock(&dev->lock);
1307
1308         f->fmt.sliced.service_set = 0;
1309
1310         em28xx_i2c_call_clients(dev, VIDIOC_G_FMT, f);
1311
1312         if (f->fmt.sliced.service_set == 0)
1313                 rc = -EINVAL;
1314
1315         mutex_unlock(&dev->lock);
1316         return rc;
1317 }
1318
1319 static int vidioc_try_set_sliced_vbi_cap(struct file *file, void *priv,
1320                         struct v4l2_format *f)
1321 {
1322         struct em28xx_fh      *fh  = priv;
1323         struct em28xx         *dev = fh->dev;
1324         int                   rc;
1325
1326         rc = check_dev(dev);
1327         if (rc < 0)
1328                 return rc;
1329
1330         mutex_lock(&dev->lock);
1331         em28xx_i2c_call_clients(dev, VIDIOC_G_FMT, f);
1332         mutex_unlock(&dev->lock);
1333
1334         if (f->fmt.sliced.service_set == 0)
1335                 return -EINVAL;
1336
1337         return 0;
1338 }
1339
1340
1341 static int vidioc_reqbufs(struct file *file, void *priv,
1342                           struct v4l2_requestbuffers *rb)
1343 {
1344         struct em28xx_fh      *fh  = priv;
1345         struct em28xx         *dev = fh->dev;
1346         int                   rc;
1347
1348         rc = check_dev(dev);
1349         if (rc < 0)
1350                 return rc;
1351
1352         return (videobuf_reqbufs(&fh->vb_vidq, rb));
1353 }
1354
1355 static int vidioc_querybuf(struct file *file, void *priv,
1356                            struct v4l2_buffer *b)
1357 {
1358         struct em28xx_fh      *fh  = priv;
1359         struct em28xx         *dev = fh->dev;
1360         int                   rc;
1361
1362         rc = check_dev(dev);
1363         if (rc < 0)
1364                 return rc;
1365
1366         return (videobuf_querybuf(&fh->vb_vidq, b));
1367 }
1368
1369 static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *b)
1370 {
1371         struct em28xx_fh      *fh  = priv;
1372         struct em28xx         *dev = fh->dev;
1373         int                   rc;
1374
1375         rc = check_dev(dev);
1376         if (rc < 0)
1377                 return rc;
1378
1379         return (videobuf_qbuf(&fh->vb_vidq, b));
1380 }
1381
1382 static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *b)
1383 {
1384         struct em28xx_fh      *fh  = priv;
1385         struct em28xx         *dev = fh->dev;
1386         int                   rc;
1387
1388         rc = check_dev(dev);
1389         if (rc < 0)
1390                 return rc;
1391
1392         return (videobuf_dqbuf(&fh->vb_vidq, b,
1393                                 file->f_flags & O_NONBLOCK));
1394 }
1395
1396 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1397 static int vidiocgmbuf(struct file *file, void *priv, struct video_mbuf *mbuf)
1398 {
1399         struct em28xx_fh  *fh = priv;
1400
1401         return videobuf_cgmbuf(&fh->vb_vidq, mbuf, 8);
1402 }
1403 #endif
1404
1405
1406 /* ----------------------------------------------------------- */
1407 /* RADIO ESPECIFIC IOCTLS                                      */
1408 /* ----------------------------------------------------------- */
1409
1410 static int radio_querycap(struct file *file, void  *priv,
1411                           struct v4l2_capability *cap)
1412 {
1413         struct em28xx *dev = ((struct em28xx_fh *)priv)->dev;
1414
1415         strlcpy(cap->driver, "em28xx", sizeof(cap->driver));
1416         strlcpy(cap->card, em28xx_boards[dev->model].name, sizeof(cap->card));
1417         strlcpy(cap->bus_info, dev->udev->dev.bus_id, sizeof(cap->bus_info));
1418
1419         cap->version = EM28XX_VERSION_CODE;
1420         cap->capabilities = V4L2_CAP_TUNER;
1421         return 0;
1422 }
1423
1424 static int radio_g_tuner(struct file *file, void *priv,
1425                          struct v4l2_tuner *t)
1426 {
1427         struct em28xx *dev = ((struct em28xx_fh *)priv)->dev;
1428
1429         if (unlikely(t->index > 0))
1430                 return -EINVAL;
1431
1432         strcpy(t->name, "Radio");
1433         t->type = V4L2_TUNER_RADIO;
1434
1435         em28xx_i2c_call_clients(dev, VIDIOC_G_TUNER, t);
1436         return 0;
1437 }
1438
1439 static int radio_enum_input(struct file *file, void *priv,
1440                             struct v4l2_input *i)
1441 {
1442         if (i->index != 0)
1443                 return -EINVAL;
1444         strcpy(i->name, "Radio");
1445         i->type = V4L2_INPUT_TYPE_TUNER;
1446
1447         return 0;
1448 }
1449
1450 static int radio_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
1451 {
1452         if (unlikely(a->index))
1453                 return -EINVAL;
1454
1455         strcpy(a->name, "Radio");
1456         return 0;
1457 }
1458
1459 static int radio_s_tuner(struct file *file, void *priv,
1460                          struct v4l2_tuner *t)
1461 {
1462         struct em28xx *dev = ((struct em28xx_fh *)priv)->dev;
1463
1464         if (0 != t->index)
1465                 return -EINVAL;
1466
1467         em28xx_i2c_call_clients(dev, VIDIOC_S_TUNER, t);
1468
1469         return 0;
1470 }
1471
1472 static int radio_s_audio(struct file *file, void *fh,
1473                          struct v4l2_audio *a)
1474 {
1475         return 0;
1476 }
1477
1478 static int radio_s_input(struct file *file, void *fh, unsigned int i)
1479 {
1480         return 0;
1481 }
1482
1483 static int radio_queryctrl(struct file *file, void *priv,
1484                            struct v4l2_queryctrl *qc)
1485 {
1486         int i;
1487
1488         if (qc->id <  V4L2_CID_BASE ||
1489                 qc->id >= V4L2_CID_LASTP1)
1490                 return -EINVAL;
1491
1492         for (i = 0; i < ARRAY_SIZE(em28xx_qctrl); i++) {
1493                 if (qc->id && qc->id == em28xx_qctrl[i].id) {
1494                         memcpy(qc, &(em28xx_qctrl[i]), sizeof(*qc));
1495                         return 0;
1496                 }
1497         }
1498
1499         return -EINVAL;
1500 }
1501
1502 /*
1503  * em28xx_v4l2_open()
1504  * inits the device and starts isoc transfer
1505  */
1506 static int em28xx_v4l2_open(struct inode *inode, struct file *filp)
1507 {
1508         int minor = iminor(inode);
1509         int errCode = 0, radio = 0;
1510         struct em28xx *h, *dev = NULL;
1511         struct em28xx_fh *fh;
1512         enum v4l2_buf_type fh_type = 0;
1513
1514         list_for_each_entry(h, &em28xx_devlist, devlist) {
1515                 if (h->vdev->minor == minor) {
1516                         dev  = h;
1517                         fh_type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1518                 }
1519                 if (h->vbi_dev->minor == minor) {
1520                         dev  = h;
1521                         fh_type = V4L2_BUF_TYPE_VBI_CAPTURE;
1522                 }
1523                 if (h->radio_dev &&
1524                     h->radio_dev->minor == minor) {
1525                         radio = 1;
1526                         dev   = h;
1527                 }
1528         }
1529         if (NULL == dev)
1530                 return -ENODEV;
1531
1532         em28xx_videodbg("open minor=%d type=%s users=%d\n",
1533                                 minor, v4l2_type_names[fh_type], dev->users);
1534
1535
1536         fh = kzalloc(sizeof(struct em28xx_fh), GFP_KERNEL);
1537         if (!fh) {
1538                 em28xx_errdev("em28xx-video.c: Out of memory?!\n");
1539                 return -ENOMEM;
1540         }
1541         mutex_lock(&dev->lock);
1542         fh->dev = dev;
1543         fh->radio = radio;
1544         fh->type = fh_type;
1545         filp->private_data = fh;
1546
1547         if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && dev->users == 0) {
1548                 dev->width = norm_maxw(dev);
1549                 dev->height = norm_maxh(dev);
1550                 dev->hscale = 0;
1551                 dev->vscale = 0;
1552
1553                 em28xx_set_mode(dev, EM28XX_ANALOG_MODE);
1554                 em28xx_set_alternate(dev);
1555                 em28xx_resolution_set(dev);
1556
1557                 /* Needed, since GPIO might have disabled power of
1558                    some i2c device
1559                  */
1560                 em28xx_config_i2c(dev);
1561
1562         }
1563         if (fh->radio) {
1564                 em28xx_videodbg("video_open: setting radio device\n");
1565                 em28xx_i2c_call_clients(dev, AUDC_SET_RADIO, NULL);
1566         }
1567
1568         dev->users++;
1569
1570         videobuf_queue_vmalloc_init(&fh->vb_vidq, &em28xx_video_qops,
1571                         NULL, &dev->slock, fh->type, V4L2_FIELD_INTERLACED,
1572                         sizeof(struct em28xx_buffer), fh);
1573
1574         mutex_unlock(&dev->lock);
1575
1576         return errCode;
1577 }
1578
1579 /*
1580  * em28xx_realease_resources()
1581  * unregisters the v4l2,i2c and usb devices
1582  * called when the device gets disconected or at module unload
1583 */
1584 static void em28xx_release_resources(struct em28xx *dev)
1585 {
1586
1587         /*FIXME: I2C IR should be disconnected */
1588
1589         em28xx_info("V4L2 devices /dev/video%d and /dev/vbi%d deregistered\n",
1590                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
1591                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
1592         list_del(&dev->devlist);
1593         if (dev->sbutton_input_dev)
1594                 em28xx_deregister_snapshot_button(dev);
1595         if (dev->radio_dev) {
1596                 if (-1 != dev->radio_dev->minor)
1597                         video_unregister_device(dev->radio_dev);
1598                 else
1599                         video_device_release(dev->radio_dev);
1600                 dev->radio_dev = NULL;
1601         }
1602         if (dev->vbi_dev) {
1603                 if (-1 != dev->vbi_dev->minor)
1604                         video_unregister_device(dev->vbi_dev);
1605                 else
1606                         video_device_release(dev->vbi_dev);
1607                 dev->vbi_dev = NULL;
1608         }
1609         if (dev->vdev) {
1610                 if (-1 != dev->vdev->minor)
1611                         video_unregister_device(dev->vdev);
1612                 else
1613                         video_device_release(dev->vdev);
1614                 dev->vdev = NULL;
1615         }
1616         em28xx_i2c_unregister(dev);
1617         usb_put_dev(dev->udev);
1618
1619         /* Mark device as unused */
1620         em28xx_devused &= ~(1<<dev->devno);
1621 }
1622
1623 /*
1624  * em28xx_v4l2_close()
1625  * stops streaming and deallocates all resources allocated by the v4l2
1626  * calls and ioctls
1627  */
1628 static int em28xx_v4l2_close(struct inode *inode, struct file *filp)
1629 {
1630         struct em28xx_fh *fh  = filp->private_data;
1631         struct em28xx    *dev = fh->dev;
1632         int              errCode;
1633
1634         em28xx_videodbg("users=%d\n", dev->users);
1635
1636
1637         if (res_check(fh))
1638                 res_free(fh);
1639
1640         mutex_lock(&dev->lock);
1641
1642         if (dev->users == 1) {
1643                 videobuf_stop(&fh->vb_vidq);
1644                 videobuf_mmap_free(&fh->vb_vidq);
1645
1646                 /* the device is already disconnect,
1647                    free the remaining resources */
1648                 if (dev->state & DEV_DISCONNECTED) {
1649                         em28xx_release_resources(dev);
1650                         mutex_unlock(&dev->lock);
1651                         kfree(dev);
1652                         return 0;
1653                 }
1654
1655                 /* do this before setting alternate! */
1656                 em28xx_uninit_isoc(dev);
1657                 em28xx_set_mode(dev, EM28XX_MODE_UNDEFINED);
1658
1659                 /* set alternate 0 */
1660                 dev->alt = 0;
1661                 em28xx_videodbg("setting alternate 0\n");
1662                 errCode = usb_set_interface(dev->udev, 0, 0);
1663                 if (errCode < 0) {
1664                         em28xx_errdev("cannot change alternate number to "
1665                                         "0 (error=%i)\n", errCode);
1666                 }
1667         }
1668         kfree(fh);
1669         dev->users--;
1670         wake_up_interruptible_nr(&dev->open, 1);
1671         mutex_unlock(&dev->lock);
1672         return 0;
1673 }
1674
1675 /*
1676  * em28xx_v4l2_read()
1677  * will allocate buffers when called for the first time
1678  */
1679 static ssize_t
1680 em28xx_v4l2_read(struct file *filp, char __user *buf, size_t count,
1681                  loff_t *pos)
1682 {
1683         struct em28xx_fh *fh = filp->private_data;
1684         struct em28xx *dev = fh->dev;
1685         int rc;
1686
1687         rc = check_dev(dev);
1688         if (rc < 0)
1689                 return rc;
1690
1691         /* FIXME: read() is not prepared to allow changing the video
1692            resolution while streaming. Seems a bug at em28xx_set_fmt
1693          */
1694
1695         if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
1696                 if (unlikely(res_get(fh)))
1697                         return -EBUSY;
1698
1699                 return videobuf_read_stream(&fh->vb_vidq, buf, count, pos, 0,
1700                                         filp->f_flags & O_NONBLOCK);
1701         }
1702         return 0;
1703 }
1704
1705 /*
1706  * em28xx_v4l2_poll()
1707  * will allocate buffers when called for the first time
1708  */
1709 static unsigned int em28xx_v4l2_poll(struct file *filp, poll_table * wait)
1710 {
1711         struct em28xx_fh *fh = filp->private_data;
1712         struct em28xx *dev = fh->dev;
1713         int rc;
1714
1715         rc = check_dev(dev);
1716         if (rc < 0)
1717                 return rc;
1718
1719         if (unlikely(res_get(fh) < 0))
1720                 return POLLERR;
1721
1722         if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
1723                 return POLLERR;
1724
1725         return videobuf_poll_stream(filp, &fh->vb_vidq, wait);
1726 }
1727
1728 /*
1729  * em28xx_v4l2_mmap()
1730  */
1731 static int em28xx_v4l2_mmap(struct file *filp, struct vm_area_struct *vma)
1732 {
1733         struct em28xx_fh *fh    = filp->private_data;
1734         struct em28xx    *dev   = fh->dev;
1735         int              rc;
1736
1737         if (unlikely(res_get(fh) < 0))
1738                 return -EBUSY;
1739
1740         rc = check_dev(dev);
1741         if (rc < 0)
1742                 return rc;
1743
1744         rc = videobuf_mmap_mapper(&fh->vb_vidq, vma);
1745
1746         em28xx_videodbg("vma start=0x%08lx, size=%ld, ret=%d\n",
1747                 (unsigned long)vma->vm_start,
1748                 (unsigned long)vma->vm_end-(unsigned long)vma->vm_start,
1749                 rc);
1750
1751         return rc;
1752 }
1753
1754 static const struct file_operations em28xx_v4l_fops = {
1755         .owner         = THIS_MODULE,
1756         .open          = em28xx_v4l2_open,
1757         .release       = em28xx_v4l2_close,
1758         .read          = em28xx_v4l2_read,
1759         .poll          = em28xx_v4l2_poll,
1760         .mmap          = em28xx_v4l2_mmap,
1761         .ioctl         = video_ioctl2,
1762         .llseek        = no_llseek,
1763         .compat_ioctl  = v4l_compat_ioctl32,
1764 };
1765
1766 static const struct file_operations radio_fops = {
1767         .owner         = THIS_MODULE,
1768         .open          = em28xx_v4l2_open,
1769         .release       = em28xx_v4l2_close,
1770         .ioctl         = video_ioctl2,
1771         .compat_ioctl  = v4l_compat_ioctl32,
1772         .llseek        = no_llseek,
1773 };
1774
1775 static const struct video_device em28xx_video_template = {
1776         .fops                       = &em28xx_v4l_fops,
1777         .release                    = video_device_release,
1778
1779         .minor                      = -1,
1780         .vidioc_querycap            = vidioc_querycap,
1781         .vidioc_enum_fmt_vid_cap    = vidioc_enum_fmt_vid_cap,
1782         .vidioc_g_fmt_vid_cap       = vidioc_g_fmt_vid_cap,
1783         .vidioc_try_fmt_vid_cap     = vidioc_try_fmt_vid_cap,
1784         .vidioc_s_fmt_vid_cap       = vidioc_s_fmt_vid_cap,
1785         .vidioc_g_audio             = vidioc_g_audio,
1786         .vidioc_s_audio             = vidioc_s_audio,
1787         .vidioc_cropcap             = vidioc_cropcap,
1788
1789         .vidioc_g_fmt_sliced_vbi_cap   = vidioc_g_fmt_sliced_vbi_cap,
1790         .vidioc_try_fmt_sliced_vbi_cap = vidioc_try_set_sliced_vbi_cap,
1791         .vidioc_s_fmt_sliced_vbi_cap   = vidioc_try_set_sliced_vbi_cap,
1792
1793         .vidioc_reqbufs             = vidioc_reqbufs,
1794         .vidioc_querybuf            = vidioc_querybuf,
1795         .vidioc_qbuf                = vidioc_qbuf,
1796         .vidioc_dqbuf               = vidioc_dqbuf,
1797         .vidioc_s_std               = vidioc_s_std,
1798         .vidioc_enum_input          = vidioc_enum_input,
1799         .vidioc_g_input             = vidioc_g_input,
1800         .vidioc_s_input             = vidioc_s_input,
1801         .vidioc_queryctrl           = vidioc_queryctrl,
1802         .vidioc_g_ctrl              = vidioc_g_ctrl,
1803         .vidioc_s_ctrl              = vidioc_s_ctrl,
1804         .vidioc_streamon            = vidioc_streamon,
1805         .vidioc_streamoff           = vidioc_streamoff,
1806         .vidioc_g_tuner             = vidioc_g_tuner,
1807         .vidioc_s_tuner             = vidioc_s_tuner,
1808         .vidioc_g_frequency         = vidioc_g_frequency,
1809         .vidioc_s_frequency         = vidioc_s_frequency,
1810 #ifdef CONFIG_VIDEO_ADV_DEBUG
1811         .vidioc_g_register          = vidioc_g_register,
1812         .vidioc_s_register          = vidioc_s_register,
1813 #endif
1814 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1815         .vidiocgmbuf                = vidiocgmbuf,
1816 #endif
1817
1818         .tvnorms                    = V4L2_STD_ALL,
1819         .current_norm               = V4L2_STD_PAL,
1820 };
1821
1822 static struct video_device em28xx_radio_template = {
1823         .name                 = "em28xx-radio",
1824         .type                 = VID_TYPE_TUNER,
1825         .fops                 = &radio_fops,
1826         .minor                = -1,
1827         .vidioc_querycap      = radio_querycap,
1828         .vidioc_g_tuner       = radio_g_tuner,
1829         .vidioc_enum_input    = radio_enum_input,
1830         .vidioc_g_audio       = radio_g_audio,
1831         .vidioc_s_tuner       = radio_s_tuner,
1832         .vidioc_s_audio       = radio_s_audio,
1833         .vidioc_s_input       = radio_s_input,
1834         .vidioc_queryctrl     = radio_queryctrl,
1835         .vidioc_g_ctrl        = vidioc_g_ctrl,
1836         .vidioc_s_ctrl        = vidioc_s_ctrl,
1837         .vidioc_g_frequency   = vidioc_g_frequency,
1838         .vidioc_s_frequency   = vidioc_s_frequency,
1839 #ifdef CONFIG_VIDEO_ADV_DEBUG
1840         .vidioc_g_register    = vidioc_g_register,
1841         .vidioc_s_register    = vidioc_s_register,
1842 #endif
1843 };
1844
1845 /******************************** usb interface ******************************/
1846
1847
1848 static LIST_HEAD(em28xx_extension_devlist);
1849 static DEFINE_MUTEX(em28xx_extension_devlist_lock);
1850
1851 int em28xx_register_extension(struct em28xx_ops *ops)
1852 {
1853         struct em28xx *dev = NULL;
1854
1855         mutex_lock(&em28xx_extension_devlist_lock);
1856         list_add_tail(&ops->next, &em28xx_extension_devlist);
1857         list_for_each_entry(dev, &em28xx_devlist, devlist) {
1858                 if (dev)
1859                         ops->init(dev);
1860         }
1861         printk(KERN_INFO "Em28xx: Initialized (%s) extension\n", ops->name);
1862         mutex_unlock(&em28xx_extension_devlist_lock);
1863         return 0;
1864 }
1865 EXPORT_SYMBOL(em28xx_register_extension);
1866
1867 void em28xx_unregister_extension(struct em28xx_ops *ops)
1868 {
1869         struct em28xx *dev = NULL;
1870
1871         list_for_each_entry(dev, &em28xx_devlist, devlist) {
1872                 if (dev)
1873                         ops->fini(dev);
1874         }
1875
1876         mutex_lock(&em28xx_extension_devlist_lock);
1877         printk(KERN_INFO "Em28xx: Removed (%s) extension\n", ops->name);
1878         list_del(&ops->next);
1879         mutex_unlock(&em28xx_extension_devlist_lock);
1880 }
1881 EXPORT_SYMBOL(em28xx_unregister_extension);
1882
1883 static struct video_device *em28xx_vdev_init(struct em28xx *dev,
1884                                              const struct video_device *template,
1885                                              const int type,
1886                                              const char *type_name)
1887 {
1888         struct video_device *vfd;
1889
1890         vfd = video_device_alloc();
1891         if (NULL == vfd)
1892                 return NULL;
1893         *vfd = *template;
1894         vfd->minor   = -1;
1895         vfd->dev = &dev->udev->dev;
1896         vfd->release = video_device_release;
1897         vfd->type = type;
1898         vfd->debug = video_debug;
1899
1900         snprintf(vfd->name, sizeof(vfd->name), "%s %s",
1901                  dev->name, type_name);
1902
1903         return vfd;
1904 }
1905
1906
1907 /*
1908  * em28xx_init_dev()
1909  * allocates and inits the device structs, registers i2c bus and v4l device
1910  */
1911 static int em28xx_init_dev(struct em28xx **devhandle, struct usb_device *udev,
1912                            int minor)
1913 {
1914         struct em28xx_ops *ops = NULL;
1915         struct em28xx *dev = *devhandle;
1916         int retval = -ENOMEM;
1917         int errCode;
1918         unsigned int maxh, maxw;
1919
1920         dev->udev = udev;
1921         mutex_init(&dev->lock);
1922         spin_lock_init(&dev->slock);
1923         init_waitqueue_head(&dev->open);
1924         init_waitqueue_head(&dev->wait_frame);
1925         init_waitqueue_head(&dev->wait_stream);
1926
1927         dev->em28xx_write_regs = em28xx_write_regs;
1928         dev->em28xx_read_reg = em28xx_read_reg;
1929         dev->em28xx_read_reg_req_len = em28xx_read_reg_req_len;
1930         dev->em28xx_write_regs_req = em28xx_write_regs_req;
1931         dev->em28xx_read_reg_req = em28xx_read_reg_req;
1932         dev->is_em2800 = em28xx_boards[dev->model].is_em2800;
1933
1934         em28xx_pre_card_setup(dev);
1935
1936         errCode = em28xx_config(dev);
1937         if (errCode) {
1938                 em28xx_errdev("error configuring device\n");
1939                 em28xx_devused &= ~(1<<dev->devno);
1940                 kfree(dev);
1941                 return -ENOMEM;
1942         }
1943
1944         /* register i2c bus */
1945         em28xx_i2c_register(dev);
1946
1947         /* Do board specific init and eeprom reading */
1948         em28xx_card_setup(dev);
1949
1950         /* Configure audio */
1951         em28xx_audio_analog_set(dev);
1952
1953         /* configure the device */
1954         em28xx_config_i2c(dev);
1955
1956         /* set default norm */
1957         dev->norm = em28xx_video_template.current_norm;
1958
1959         maxw = norm_maxw(dev);
1960         maxh = norm_maxh(dev);
1961
1962         /* set default image size */
1963         dev->width = maxw;
1964         dev->height = maxh;
1965         dev->interlaced = EM28XX_INTERLACED_DEFAULT;
1966         dev->hscale = 0;
1967         dev->vscale = 0;
1968         dev->ctl_input = 2;
1969
1970         errCode = em28xx_config(dev);
1971
1972         list_add_tail(&dev->devlist, &em28xx_devlist);
1973
1974         /* allocate and fill video video_device struct */
1975         dev->vdev = em28xx_vdev_init(dev, &em28xx_video_template,
1976                                           VID_TYPE_CAPTURE, "video");
1977         if (NULL == dev->vdev) {
1978                 em28xx_errdev("cannot allocate video_device.\n");
1979                 goto fail_unreg;
1980         }
1981         if (dev->tuner_type != TUNER_ABSENT)
1982                 dev->vdev->type |= VID_TYPE_TUNER;
1983
1984         /* register v4l2 video video_device */
1985         retval = video_register_device(dev->vdev, VFL_TYPE_GRABBER,
1986                                        video_nr[dev->devno]);
1987         if (retval) {
1988                 em28xx_errdev("unable to register video device (error=%i).\n",
1989                               retval);
1990                 goto fail_unreg;
1991         }
1992
1993         /* Allocate and fill vbi video_device struct */
1994         dev->vbi_dev = em28xx_vdev_init(dev, &em28xx_video_template,
1995                                           VFL_TYPE_VBI, "vbi");
1996         /* register v4l2 vbi video_device */
1997         if (video_register_device(dev->vbi_dev, VFL_TYPE_VBI,
1998                                         vbi_nr[dev->devno]) < 0) {
1999                 em28xx_errdev("unable to register vbi device\n");
2000                 retval = -ENODEV;
2001                 goto fail_unreg;
2002         }
2003
2004         if (em28xx_boards[dev->model].radio.type == EM28XX_RADIO) {
2005                 dev->radio_dev = em28xx_vdev_init(dev, &em28xx_radio_template,
2006                                         VFL_TYPE_RADIO, "radio");
2007                 if (NULL == dev->radio_dev) {
2008                         em28xx_errdev("cannot allocate video_device.\n");
2009                         goto fail_unreg;
2010                 }
2011                 retval = video_register_device(dev->radio_dev, VFL_TYPE_RADIO,
2012                                             radio_nr[dev->devno]);
2013                 if (retval < 0) {
2014                         em28xx_errdev("can't register radio device\n");
2015                         goto fail_unreg;
2016                 }
2017                 em28xx_info("Registered radio device as /dev/radio%d\n",
2018                             dev->radio_dev->minor & 0x1f);
2019         }
2020
2021         /* init video dma queues */
2022         INIT_LIST_HEAD(&dev->vidq.active);
2023         INIT_LIST_HEAD(&dev->vidq.queued);
2024
2025
2026         if (dev->has_msp34xx) {
2027                 /* Send a reset to other chips via gpio */
2028                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xf7", 1);
2029                 msleep(3);
2030                 em28xx_write_regs_req(dev, 0x00, 0x08, "\xff", 1);
2031                 msleep(3);
2032         }
2033
2034         video_mux(dev, 0);
2035
2036         em28xx_info("V4L2 device registered as /dev/video%d and /dev/vbi%d\n",
2037                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN,
2038                                 dev->vbi_dev->minor-MINOR_VFL_TYPE_VBI_MIN);
2039
2040         mutex_lock(&em28xx_extension_devlist_lock);
2041         if (!list_empty(&em28xx_extension_devlist)) {
2042                 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
2043                         if (ops->id)
2044                                 ops->init(dev);
2045                 }
2046         }
2047         mutex_unlock(&em28xx_extension_devlist_lock);
2048
2049         return 0;
2050
2051 fail_unreg:
2052         em28xx_release_resources(dev);
2053         mutex_unlock(&dev->lock);
2054         kfree(dev);
2055         return retval;
2056 }
2057
2058 #if defined(CONFIG_MODULES) && defined(MODULE)
2059 static void request_module_async(struct work_struct *work)
2060 {
2061         struct em28xx *dev = container_of(work,
2062                              struct em28xx, request_module_wk);
2063
2064         if (dev->has_audio_class)
2065                 request_module("snd-usb-audio");
2066         else
2067                 request_module("em28xx-alsa");
2068
2069         if (dev->has_dvb)
2070                 request_module("em28xx-dvb");
2071 }
2072
2073 static void request_modules(struct em28xx *dev)
2074 {
2075         INIT_WORK(&dev->request_module_wk, request_module_async);
2076         schedule_work(&dev->request_module_wk);
2077 }
2078 #else
2079 #define request_modules(dev)
2080 #endif /* CONFIG_MODULES */
2081
2082 /*
2083  * em28xx_usb_probe()
2084  * checks for supported devices
2085  */
2086 static int em28xx_usb_probe(struct usb_interface *interface,
2087                             const struct usb_device_id *id)
2088 {
2089         const struct usb_endpoint_descriptor *endpoint;
2090         struct usb_device *udev;
2091         struct usb_interface *uif;
2092         struct em28xx *dev = NULL;
2093         int retval = -ENODEV;
2094         int i, nr, ifnum;
2095
2096         udev = usb_get_dev(interface_to_usbdev(interface));
2097         ifnum = interface->altsetting[0].desc.bInterfaceNumber;
2098
2099         /* Check to see next free device and mark as used */
2100         nr = find_first_zero_bit(&em28xx_devused, EM28XX_MAXBOARDS);
2101         em28xx_devused |= 1<<nr;
2102
2103         /* Don't register audio interfaces */
2104         if (interface->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
2105                 em28xx_err(DRIVER_NAME " audio device (%04x:%04x): interface %i, class %i\n",
2106                                 udev->descriptor.idVendor,
2107                                 udev->descriptor.idProduct,
2108                                 ifnum,
2109                                 interface->altsetting[0].desc.bInterfaceClass);
2110
2111                 em28xx_devused &= ~(1<<nr);
2112                 return -ENODEV;
2113         }
2114
2115         em28xx_err(DRIVER_NAME " new video device (%04x:%04x): interface %i, class %i\n",
2116                         udev->descriptor.idVendor,
2117                         udev->descriptor.idProduct,
2118                         ifnum,
2119                         interface->altsetting[0].desc.bInterfaceClass);
2120
2121         endpoint = &interface->cur_altsetting->endpoint[1].desc;
2122
2123         /* check if the device has the iso in endpoint at the correct place */
2124         if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
2125             USB_ENDPOINT_XFER_ISOC) {
2126                 em28xx_err(DRIVER_NAME " probing error: endpoint is non-ISO endpoint!\n");
2127                 em28xx_devused &= ~(1<<nr);
2128                 return -ENODEV;
2129         }
2130         if ((endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT) {
2131                 em28xx_err(DRIVER_NAME " probing error: endpoint is ISO OUT endpoint!\n");
2132                 em28xx_devused &= ~(1<<nr);
2133                 return -ENODEV;
2134         }
2135
2136         if (nr >= EM28XX_MAXBOARDS) {
2137                 printk(DRIVER_NAME ": Supports only %i em28xx boards.\n",
2138                                 EM28XX_MAXBOARDS);
2139                 em28xx_devused &= ~(1<<nr);
2140                 return -ENOMEM;
2141         }
2142
2143         /* allocate memory for our device state and initialize it */
2144         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2145         if (dev == NULL) {
2146                 em28xx_err(DRIVER_NAME ": out of memory!\n");
2147                 em28xx_devused &= ~(1<<nr);
2148                 return -ENOMEM;
2149         }
2150
2151         snprintf(dev->name, 29, "em28xx #%d", nr);
2152         dev->devno = nr;
2153         dev->model = id->driver_info;
2154         dev->alt   = -1;
2155
2156         /* Checks if audio is provided by some interface */
2157         for (i = 0; i < udev->config->desc.bNumInterfaces; i++) {
2158                 uif = udev->config->interface[i];
2159                 if (uif->altsetting[0].desc.bInterfaceClass == USB_CLASS_AUDIO) {
2160                         dev->has_audio_class = 1;
2161                         break;
2162                 }
2163         }
2164
2165         printk(KERN_INFO DRIVER_NAME " %s usb audio class\n",
2166                    dev->has_audio_class ? "Has" : "Doesn't have");
2167
2168         /* compute alternate max packet sizes */
2169         uif = udev->actconfig->interface[0];
2170
2171         dev->num_alt = uif->num_altsetting;
2172         em28xx_info("Alternate settings: %i\n", dev->num_alt);
2173 /*      dev->alt_max_pkt_size = kmalloc(sizeof(*dev->alt_max_pkt_size)* */
2174         dev->alt_max_pkt_size = kmalloc(32 * dev->num_alt, GFP_KERNEL);
2175
2176         if (dev->alt_max_pkt_size == NULL) {
2177                 em28xx_errdev("out of memory!\n");
2178                 em28xx_devused &= ~(1<<nr);
2179                 kfree(dev);
2180                 return -ENOMEM;
2181         }
2182
2183         for (i = 0; i < dev->num_alt ; i++) {
2184                 u16 tmp = le16_to_cpu(uif->altsetting[i].endpoint[1].desc.
2185                                                         wMaxPacketSize);
2186                 dev->alt_max_pkt_size[i] =
2187                     (tmp & 0x07ff) * (((tmp & 0x1800) >> 11) + 1);
2188                 em28xx_info("Alternate setting %i, max size= %i\n", i,
2189                                                 dev->alt_max_pkt_size[i]);
2190         }
2191
2192         if ((card[nr] >= 0) && (card[nr] < em28xx_bcount))
2193                 dev->model = card[nr];
2194
2195         /* allocate device struct */
2196         retval = em28xx_init_dev(&dev, udev, nr);
2197         if (retval)
2198                 return retval;
2199
2200         em28xx_info("Found %s\n", em28xx_boards[dev->model].name);
2201
2202         /* save our data pointer in this interface device */
2203         usb_set_intfdata(interface, dev);
2204
2205         request_modules(dev);
2206
2207         return 0;
2208 }
2209
2210 /*
2211  * em28xx_usb_disconnect()
2212  * called when the device gets diconencted
2213  * video device will be unregistered on v4l2_close in case it is still open
2214  */
2215 static void em28xx_usb_disconnect(struct usb_interface *interface)
2216 {
2217         struct em28xx *dev;
2218         struct em28xx_ops *ops = NULL;
2219
2220         dev = usb_get_intfdata(interface);
2221         usb_set_intfdata(interface, NULL);
2222
2223         if (!dev)
2224                 return;
2225
2226         em28xx_info("disconnecting %s\n", dev->vdev->name);
2227
2228         /* wait until all current v4l2 io is finished then deallocate
2229            resources */
2230         mutex_lock(&dev->lock);
2231
2232         wake_up_interruptible_all(&dev->open);
2233
2234         if (dev->users) {
2235                 em28xx_warn
2236                     ("device /dev/video%d is open! Deregistration and memory "
2237                      "deallocation are deferred on close.\n",
2238                                 dev->vdev->minor-MINOR_VFL_TYPE_GRABBER_MIN);
2239
2240                 dev->state |= DEV_MISCONFIGURED;
2241                 em28xx_uninit_isoc(dev);
2242                 dev->state |= DEV_DISCONNECTED;
2243                 wake_up_interruptible(&dev->wait_frame);
2244                 wake_up_interruptible(&dev->wait_stream);
2245         } else {
2246                 dev->state |= DEV_DISCONNECTED;
2247                 em28xx_release_resources(dev);
2248         }
2249         mutex_unlock(&dev->lock);
2250
2251         mutex_lock(&em28xx_extension_devlist_lock);
2252         if (!list_empty(&em28xx_extension_devlist)) {
2253                 list_for_each_entry(ops, &em28xx_extension_devlist, next) {
2254                         ops->fini(dev);
2255                 }
2256         }
2257         mutex_unlock(&em28xx_extension_devlist_lock);
2258
2259         if (!dev->users) {
2260                 kfree(dev->alt_max_pkt_size);
2261                 kfree(dev);
2262         }
2263 }
2264
2265 static struct usb_driver em28xx_usb_driver = {
2266         .name = "em28xx",
2267         .probe = em28xx_usb_probe,
2268         .disconnect = em28xx_usb_disconnect,
2269         .id_table = em28xx_id_table,
2270 };
2271
2272 static int __init em28xx_module_init(void)
2273 {
2274         int result;
2275
2276         printk(KERN_INFO DRIVER_NAME " v4l2 driver version %d.%d.%d loaded\n",
2277                (EM28XX_VERSION_CODE >> 16) & 0xff,
2278                (EM28XX_VERSION_CODE >> 8) & 0xff, EM28XX_VERSION_CODE & 0xff);
2279 #ifdef SNAPSHOT
2280         printk(KERN_INFO DRIVER_NAME " snapshot date %04d-%02d-%02d\n",
2281                SNAPSHOT / 10000, (SNAPSHOT / 100) % 100, SNAPSHOT % 100);
2282 #endif
2283
2284         /* register this driver with the USB subsystem */
2285         result = usb_register(&em28xx_usb_driver);
2286         if (result)
2287                 em28xx_err(DRIVER_NAME
2288                            " usb_register failed. Error number %d.\n", result);
2289
2290         return result;
2291 }
2292
2293 static void __exit em28xx_module_exit(void)
2294 {
2295         /* deregister this driver with the USB subsystem */
2296         usb_deregister(&em28xx_usb_driver);
2297 }
2298
2299 module_init(em28xx_module_init);
2300 module_exit(em28xx_module_exit);