6965bafe54a1372a116c34151a9645a4c03cb8c1
[linux-2.6.git] / drivers / media / video / em28xx / em28xx-core.c
1 /*
2    em28xx-core.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
3
4    Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
5                       Markus Rechberger <mrechberger@gmail.com>
6                       Mauro Carvalho Chehab <mchehab@infradead.org>
7                       Sascha Sommer <saschasommer@freenet.de>
8
9    This program is free software; you can redistribute it and/or modify
10    it under the terms of the GNU General Public License as published by
11    the Free Software Foundation; either version 2 of the License, or
12    (at your option) any later version.
13
14    This program is distributed in the hope that it will be useful,
15    but WITHOUT ANY WARRANTY; without even the implied warranty of
16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17    GNU General Public License for more details.
18
19    You should have received a copy of the GNU General Public License
20    along with this program; if not, write to the Free Software
21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22  */
23
24 #include <linux/init.h>
25 #include <linux/list.h>
26 #include <linux/module.h>
27 #include <linux/usb.h>
28 #include <linux/vmalloc.h>
29
30 #include "em28xx.h"
31
32 /* #define ENABLE_DEBUG_ISOC_FRAMES */
33
34 static unsigned int core_debug = 0;
35 module_param(core_debug,int,0644);
36 MODULE_PARM_DESC(core_debug,"enable debug messages [core]");
37
38 #define em28xx_coredbg(fmt, arg...) do {\
39         if (core_debug) \
40                 printk(KERN_INFO "%s %s :"fmt, \
41                          dev->name, __FUNCTION__ , ##arg); } while (0)
42
43 static unsigned int reg_debug = 0;
44 module_param(reg_debug,int,0644);
45 MODULE_PARM_DESC(reg_debug,"enable debug messages [URB reg]");
46
47 #define em28xx_regdbg(fmt, arg...) do {\
48         if (reg_debug) \
49                 printk(KERN_INFO "%s %s :"fmt, \
50                          dev->name, __FUNCTION__ , ##arg); } while (0)
51
52 static unsigned int isoc_debug = 0;
53 module_param(isoc_debug,int,0644);
54 MODULE_PARM_DESC(isoc_debug,"enable debug messages [isoc transfers]");
55
56 #define em28xx_isocdbg(fmt, arg...) do {\
57         if (isoc_debug) \
58                 printk(KERN_INFO "%s %s :"fmt, \
59                          dev->name, __FUNCTION__ , ##arg); } while (0)
60
61 static int alt = EM28XX_PINOUT;
62 module_param(alt, int, 0644);
63 MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
64
65
66 /*
67  * em28xx_request_buffers()
68  * allocate a number of buffers
69  */
70 u32 em28xx_request_buffers(struct em28xx *dev, u32 count)
71 {
72         const size_t imagesize = PAGE_ALIGN(dev->frame_size);   /*needs to be page aligned cause the buffers can be mapped individually! */
73         void *buff = NULL;
74         u32 i;
75         em28xx_coredbg("requested %i buffers with size %zi", count, imagesize);
76         if (count > EM28XX_NUM_FRAMES)
77                 count = EM28XX_NUM_FRAMES;
78
79         dev->num_frames = count;
80         while (dev->num_frames > 0) {
81                 if ((buff = vmalloc_32(dev->num_frames * imagesize))) {
82                         memset(buff, 0, dev->num_frames * imagesize);
83                         break;
84                 }
85                 dev->num_frames--;
86         }
87
88         for (i = 0; i < dev->num_frames; i++) {
89                 dev->frame[i].bufmem = buff + i * imagesize;
90                 dev->frame[i].buf.index = i;
91                 dev->frame[i].buf.m.offset = i * imagesize;
92                 dev->frame[i].buf.length = dev->frame_size;
93                 dev->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
94                 dev->frame[i].buf.sequence = 0;
95                 dev->frame[i].buf.field = V4L2_FIELD_NONE;
96                 dev->frame[i].buf.memory = V4L2_MEMORY_MMAP;
97                 dev->frame[i].buf.flags = 0;
98         }
99         return dev->num_frames;
100 }
101
102 /*
103  * em28xx_queue_unusedframes()
104  * add all frames that are not currently in use to the inbuffer queue
105  */
106 void em28xx_queue_unusedframes(struct em28xx *dev)
107 {
108         unsigned long lock_flags;
109         u32 i;
110
111         for (i = 0; i < dev->num_frames; i++)
112                 if (dev->frame[i].state == F_UNUSED) {
113                         dev->frame[i].state = F_QUEUED;
114                         spin_lock_irqsave(&dev->queue_lock, lock_flags);
115                         list_add_tail(&dev->frame[i].frame, &dev->inqueue);
116                         spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
117                 }
118 }
119
120 /*
121  * em28xx_release_buffers()
122  * free frame buffers
123  */
124 void em28xx_release_buffers(struct em28xx *dev)
125 {
126         if (dev->num_frames) {
127                 vfree(dev->frame[0].bufmem);
128                 dev->num_frames = 0;
129         }
130 }
131
132 /*
133  * em28xx_read_reg_req()
134  * reads data from the usb device specifying bRequest
135  */
136 int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
137                                    char *buf, int len)
138 {
139         int ret, byte;
140
141         if (dev->state & DEV_DISCONNECTED)
142                 return(-ENODEV);
143
144         em28xx_regdbg("req=%02x, reg=%02x ", req, reg);
145
146         ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
147                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
148                               0x0000, reg, buf, len, HZ);
149
150         if (reg_debug){
151                 printk(ret < 0 ? " failed!\n" : "%02x values: ", ret);
152                 for (byte = 0; byte < len; byte++) {
153                         printk(" %02x", (unsigned char)buf[byte]);
154                 }
155                 printk("\n");
156         }
157
158         return ret;
159 }
160
161 /*
162  * em28xx_read_reg_req()
163  * reads data from the usb device specifying bRequest
164  */
165 int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
166 {
167         u8 val;
168         int ret;
169
170         if (dev->state & DEV_DISCONNECTED)
171                 return(-ENODEV);
172
173         em28xx_regdbg("req=%02x, reg=%02x:", req, reg);
174
175         ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
176                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
177                               0x0000, reg, &val, 1, HZ);
178
179         if (reg_debug)
180                 printk(ret < 0 ? " failed!\n" :
181                                  "%02x\n", (unsigned char) val);
182
183         if (ret < 0)
184                 return ret;
185
186         return val;
187 }
188
189 int em28xx_read_reg(struct em28xx *dev, u16 reg)
190 {
191         return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
192 }
193
194 /*
195  * em28xx_write_regs_req()
196  * sends data to the usb device, specifying bRequest
197  */
198 int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
199                                  int len)
200 {
201         int ret;
202
203         /*usb_control_msg seems to expect a kmalloced buffer */
204         unsigned char *bufs;
205
206         if (dev->state & DEV_DISCONNECTED)
207                 return(-ENODEV);
208
209         bufs = kmalloc(len, GFP_KERNEL);
210
211         em28xx_regdbg("req=%02x reg=%02x:", req, reg);
212
213         if (reg_debug) {
214                 int i;
215                 for (i = 0; i < len; ++i)
216                         printk (" %02x", (unsigned char)buf[i]);
217                 printk ("\n");
218         }
219
220         if (!bufs)
221                 return -ENOMEM;
222         memcpy(bufs, buf, len);
223         ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), req,
224                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
225                               0x0000, reg, bufs, len, HZ);
226         msleep(5);              /* FIXME: magic number */
227         kfree(bufs);
228         return ret;
229 }
230
231 int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
232 {
233         return em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
234 }
235
236 /*
237  * em28xx_write_reg_bits()
238  * sets only some bits (specified by bitmask) of a register, by first reading
239  * the actual value
240  */
241 static int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
242                                  u8 bitmask)
243 {
244         int oldval;
245         u8 newval;
246         if ((oldval = em28xx_read_reg(dev, reg)) < 0)
247                 return oldval;
248         newval = (((u8) oldval) & ~bitmask) | (val & bitmask);
249         return em28xx_write_regs(dev, reg, &newval, 1);
250 }
251
252 /*
253  * em28xx_write_ac97()
254  * write a 16 bit value to the specified AC97 address (LSB first!)
255  */
256 static int em28xx_write_ac97(struct em28xx *dev, u8 reg, u8 *val)
257 {
258         int ret;
259         u8 addr = reg & 0x7f;
260         if ((ret = em28xx_write_regs(dev, AC97LSB_REG, val, 2)) < 0)
261                 return ret;
262         if ((ret = em28xx_write_regs(dev, AC97ADDR_REG, &addr, 1)) < 0)
263                 return ret;
264         if ((ret = em28xx_read_reg(dev, AC97BUSY_REG)) < 0)
265                 return ret;
266         else if (((u8) ret) & 0x01) {
267                 em28xx_warn ("AC97 command still being executed: not handled properly!\n");
268         }
269         return 0;
270 }
271
272 int em28xx_set_audio_source(struct em28xx *dev)
273 {
274         static char *enable  = "\x08\x08";
275         static char *disable = "\x08\x88";
276         char *video = enable, *line = disable;
277         int ret;
278         u8 input;
279
280         if (dev->is_em2800) {
281                 if (dev->ctl_ainput)
282                         input = EM2800_AUDIO_SRC_LINE;
283                 else
284                         input = EM2800_AUDIO_SRC_TUNER;
285
286                 ret = em28xx_write_regs(dev, EM2800_AUDIOSRC_REG, &input, 1);
287                 if (ret < 0)
288                         return ret;
289         }
290
291         if (dev->has_msp34xx)
292                 input = EM28XX_AUDIO_SRC_TUNER;
293         else {
294                 switch (dev->ctl_ainput) {
295                 case EM28XX_AMUX_VIDEO:
296                         input = EM28XX_AUDIO_SRC_TUNER;
297                         break;
298                 case EM28XX_AMUX_LINE_IN:
299                         input = EM28XX_AUDIO_SRC_LINE;
300                         break;
301                 case EM28XX_AMUX_AC97_VIDEO:
302                         input = EM28XX_AUDIO_SRC_LINE;
303                         break;
304                 case EM28XX_AMUX_AC97_LINE_IN:
305                         input = EM28XX_AUDIO_SRC_LINE;
306                         video = disable;
307                         line  = enable;
308                         break;
309                 }
310         }
311
312         ret = em28xx_write_reg_bits(dev, AUDIOSRC_REG, input, 0xc0);
313         if (ret < 0)
314                 return ret;
315
316         /* Sets AC97 mixer registers
317            This is seems to be needed, even for non-ac97 configs
318          */
319         ret = em28xx_write_ac97(dev, VIDEO_AC97, video);
320         if (ret < 0)
321                 return ret;
322
323         ret = em28xx_write_ac97(dev, LINE_IN_AC97, line);
324
325         return ret;
326 }
327
328 int em28xx_audio_analog_set(struct em28xx *dev)
329 {
330         int ret;
331         char s[2] = { 0x00, 0x00 };
332         u8 xclk = 0x07;
333
334         s[0] |= 0x1f - dev->volume;
335         s[1] |= 0x1f - dev->volume;
336
337         if (dev->mute)
338                 s[1] |= 0x80;
339         ret = em28xx_write_ac97(dev, MASTER_AC97, s);
340         if (ret < 0)
341                 return ret;
342
343         if (dev->has_12mhz_i2s)
344                 xclk |= 0x20;
345
346         if (!dev->mute)
347                 xclk |= 0x80;
348
349         ret = em28xx_write_reg_bits(dev, XCLK_REG, xclk, 0xa7);
350         if (ret < 0)
351                 return ret;
352         msleep(10);
353
354         /* Selects the proper audio input */
355         ret = em28xx_set_audio_source(dev);
356
357         return ret;
358 }
359 EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
360
361 int em28xx_colorlevels_set_default(struct em28xx *dev)
362 {
363         em28xx_write_regs(dev, YGAIN_REG, "\x10", 1);   /* contrast */
364         em28xx_write_regs(dev, YOFFSET_REG, "\x00", 1); /* brightness */
365         em28xx_write_regs(dev, UVGAIN_REG, "\x10", 1);  /* saturation */
366         em28xx_write_regs(dev, UOFFSET_REG, "\x00", 1);
367         em28xx_write_regs(dev, VOFFSET_REG, "\x00", 1);
368         em28xx_write_regs(dev, SHARPNESS_REG, "\x00", 1);
369
370         em28xx_write_regs(dev, GAMMA_REG, "\x20", 1);
371         em28xx_write_regs(dev, RGAIN_REG, "\x20", 1);
372         em28xx_write_regs(dev, GGAIN_REG, "\x20", 1);
373         em28xx_write_regs(dev, BGAIN_REG, "\x20", 1);
374         em28xx_write_regs(dev, ROFFSET_REG, "\x00", 1);
375         em28xx_write_regs(dev, GOFFSET_REG, "\x00", 1);
376         return em28xx_write_regs(dev, BOFFSET_REG, "\x00", 1);
377 }
378
379 int em28xx_capture_start(struct em28xx *dev, int start)
380 {
381         int ret;
382         /* FIXME: which is the best order? */
383         /* video registers are sampled by VREF */
384         if ((ret = em28xx_write_reg_bits(dev, USBSUSP_REG, start ? 0x10 : 0x00,
385                                           0x10)) < 0)
386                 return ret;
387         /* enable video capture */
388         return em28xx_write_regs(dev, VINENABLE_REG, start ? "\x67" : "\x27", 1);
389 }
390
391 int em28xx_outfmt_set_yuv422(struct em28xx *dev)
392 {
393         em28xx_write_regs(dev, OUTFMT_REG, "\x34", 1);
394         em28xx_write_regs(dev, VINMODE_REG, "\x10", 1);
395         return em28xx_write_regs(dev, VINCTRL_REG, "\x11", 1);
396 }
397
398 static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
399                                   u8 ymin, u8 ymax)
400 {
401         em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n", xmin, ymin, xmax, ymax);
402
403         em28xx_write_regs(dev, XMIN_REG, &xmin, 1);
404         em28xx_write_regs(dev, XMAX_REG, &xmax, 1);
405         em28xx_write_regs(dev, YMIN_REG, &ymin, 1);
406         return em28xx_write_regs(dev, YMAX_REG, &ymax, 1);
407 }
408
409 static int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
410                                    u16 width, u16 height)
411 {
412         u8 cwidth = width;
413         u8 cheight = height;
414         u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
415
416         em28xx_coredbg("em28xx Area Set: (%d,%d)\n", (width | (overflow & 2) << 7),
417                         (height | (overflow & 1) << 8));
418
419         em28xx_write_regs(dev, HSTART_REG, &hstart, 1);
420         em28xx_write_regs(dev, VSTART_REG, &vstart, 1);
421         em28xx_write_regs(dev, CWIDTH_REG, &cwidth, 1);
422         em28xx_write_regs(dev, CHEIGHT_REG, &cheight, 1);
423         return em28xx_write_regs(dev, OFLOW_REG, &overflow, 1);
424 }
425
426 static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
427 {
428         u8 mode;
429         /* the em2800 scaler only supports scaling down to 50% */
430         if(dev->is_em2800)
431                 mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
432         else {
433                 u8 buf[2];
434                 buf[0] = h;
435                 buf[1] = h >> 8;
436                 em28xx_write_regs(dev, HSCALELOW_REG, (char *)buf, 2);
437                 buf[0] = v;
438                 buf[1] = v >> 8;
439                 em28xx_write_regs(dev, VSCALELOW_REG, (char *)buf, 2);
440                 /* it seems that both H and V scalers must be active to work correctly */
441                 mode = (h || v)? 0x30: 0x00;
442         }
443         return em28xx_write_reg_bits(dev, COMPR_REG, mode, 0x30);
444 }
445
446 /* FIXME: this only function read values from dev */
447 int em28xx_resolution_set(struct em28xx *dev)
448 {
449         int width, height;
450         width = norm_maxw(dev);
451         height = norm_maxh(dev) >> 1;
452
453         em28xx_outfmt_set_yuv422(dev);
454         em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
455         em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
456         return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
457 }
458
459
460 /******************* isoc transfer handling ****************************/
461
462 #ifdef ENABLE_DEBUG_ISOC_FRAMES
463 static void em28xx_isoc_dump(struct urb *urb)
464 {
465         int len = 0;
466         int ntrans = 0;
467         int i;
468
469         printk(KERN_DEBUG "isocIrq: sf=%d np=%d ec=%x\n",
470                urb->start_frame, urb->number_of_packets,
471                urb->error_count);
472         for (i = 0; i < urb->number_of_packets; i++) {
473                 unsigned char *buf =
474                                 urb->transfer_buffer +
475                                 urb->iso_frame_desc[i].offset;
476                 int alen = urb->iso_frame_desc[i].actual_length;
477                 if (alen > 0) {
478                         if (buf[0] == 0x88) {
479                                 ntrans++;
480                                 len += alen;
481                         } else if (buf[0] == 0x22) {
482                                 printk(KERN_DEBUG
483                                                 "= l=%d nt=%d bpp=%d\n",
484                                 len - 4 * ntrans, ntrans,
485                                 ntrans == 0 ? 0 : len / ntrans);
486                                 ntrans = 1;
487                                 len = alen;
488                         } else
489                                 printk(KERN_DEBUG "!\n");
490                 }
491                 printk(KERN_DEBUG "   n=%d s=%d al=%d %x\n", i,
492                        urb->iso_frame_desc[i].status,
493                        urb->iso_frame_desc[i].actual_length,
494                        (unsigned int)
495                                        *((unsigned char *)(urb->transfer_buffer +
496                                        urb->iso_frame_desc[i].
497                                        offset)));
498         }
499 }
500 #endif
501
502 static inline int em28xx_isoc_video(struct em28xx *dev,struct em28xx_frame_t **f,
503                                     unsigned long *lock_flags, unsigned char buf)
504 {
505         if (!(buf & 0x01)) {
506                 if ((*f)->state == F_GRABBING) {
507                         /*previous frame is incomplete */
508                         if ((*f)->fieldbytesused < dev->field_size) {
509                                 (*f)->state = F_ERROR;
510                                 em28xx_isocdbg ("dropping incomplete bottom field (%i missing bytes)",
511                                          dev->field_size-(*f)->fieldbytesused);
512                         } else {
513                                 (*f)->state = F_DONE;
514                                 (*f)->buf.bytesused = dev->frame_size;
515                         }
516                 }
517                 if ((*f)->state == F_DONE || (*f)->state == F_ERROR) {
518                         /* move current frame to outqueue and get next free buffer from inqueue */
519                         spin_lock_irqsave(&dev-> queue_lock, *lock_flags);
520                         list_move_tail(&(*f)->frame, &dev->outqueue);
521                         if (!list_empty(&dev->inqueue))
522                                 (*f) = list_entry(dev-> inqueue.next,
523                         struct em28xx_frame_t,frame);
524                         else
525                                 (*f) = NULL;
526                         spin_unlock_irqrestore(&dev->queue_lock,*lock_flags);
527                 }
528                 if (!(*f)) {
529                         em28xx_isocdbg ("new frame but no buffer is free");
530                         return -1;
531                 }
532                 do_gettimeofday(&(*f)->buf.timestamp);
533                 (*f)->buf.sequence = ++dev->frame_count;
534                 (*f)->buf.field = V4L2_FIELD_INTERLACED;
535                 (*f)->state = F_GRABBING;
536                 (*f)->buf.bytesused = 0;
537                 (*f)->top_field = 1;
538                 (*f)->fieldbytesused = 0;
539         } else {
540                                         /* acquiring bottom field */
541                 if ((*f)->state == F_GRABBING) {
542                         if (!(*f)->top_field) {
543                                 (*f)->state = F_ERROR;
544                                 em28xx_isocdbg ("unexpected begin of bottom field; discarding it");
545                         } else if ((*f)-> fieldbytesused < dev->field_size - 172) {
546                                 (*f)->state = F_ERROR;
547                                 em28xx_isocdbg ("dropping incomplete top field (%i missing bytes)",
548                                          dev->field_size-(*f)->fieldbytesused);
549                         } else {
550                                 (*f)->top_field = 0;
551                                 (*f)->fieldbytesused = 0;
552                         }
553                 }
554         }
555         return (0);
556 }
557
558 static inline void em28xx_isoc_video_copy(struct em28xx *dev,
559                                           struct em28xx_frame_t **f, unsigned char *buf, int len)
560 {
561         void *fieldstart, *startwrite, *startread;
562         int linesdone, currlinedone, offset, lencopy,remain;
563
564         if(dev->frame_size != (*f)->buf.length){
565                 em28xx_err("frame_size %i and buf.length %i are different!!!\n",dev->frame_size,(*f)->buf.length);
566                 return;
567         }
568
569         if ((*f)->fieldbytesused + len > dev->field_size)
570                 len =dev->field_size - (*f)->fieldbytesused;
571
572         if (buf[0] != 0x88 && buf[0] != 0x22) {
573                 em28xx_isocdbg("frame is not complete\n");
574                 startread = buf;
575                 len+=4;
576         } else
577                 startread = buf + 4;
578
579         remain = len;
580
581         if ((*f)->top_field)
582                 fieldstart = (*f)->bufmem;
583         else
584                 fieldstart = (*f)->bufmem + dev->bytesperline;
585
586         linesdone = (*f)->fieldbytesused / dev->bytesperline;
587         currlinedone = (*f)->fieldbytesused % dev->bytesperline;
588         offset = linesdone * dev->bytesperline * 2 + currlinedone;
589         startwrite = fieldstart + offset;
590         lencopy = dev->bytesperline - currlinedone;
591         lencopy = lencopy > remain ? remain : lencopy;
592
593         memcpy(startwrite, startread, lencopy);
594         remain -= lencopy;
595
596         while (remain > 0) {
597                 startwrite += lencopy + dev->bytesperline;
598                 startread += lencopy;
599                 if (dev->bytesperline > remain)
600                         lencopy = remain;
601                 else
602                         lencopy = dev->bytesperline;
603
604                 memcpy(startwrite, startread, lencopy);
605                 remain -= lencopy;
606         }
607
608         (*f)->fieldbytesused += len;
609 }
610
611 /*
612  * em28xx_isoIrq()
613  * handles the incoming isoc urbs and fills the frames from our inqueue
614  */
615 static void em28xx_isocIrq(struct urb *urb)
616 {
617         struct em28xx *dev = urb->context;
618         int i, status;
619         struct em28xx_frame_t **f;
620         unsigned long lock_flags;
621
622         if (!dev)
623                 return;
624 #ifdef ENABLE_DEBUG_ISOC_FRAMES
625         if (isoc_debug>1)
626                 em28xx_isoc_dump(urb);
627 #endif
628
629         if (urb->status == -ENOENT)
630                 return;
631
632         f = &dev->frame_current;
633
634         if (dev->stream == STREAM_INTERRUPT) {
635                 dev->stream = STREAM_OFF;
636                 if ((*f))
637                         (*f)->state = F_QUEUED;
638                 em28xx_isocdbg("stream interrupted");
639                 wake_up_interruptible(&dev->wait_stream);
640         }
641
642         if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
643                 return;
644
645         if (dev->stream == STREAM_ON && !list_empty(&dev->inqueue)) {
646                 if (!(*f))
647                         (*f) = list_entry(dev->inqueue.next,
648                 struct em28xx_frame_t, frame);
649
650                 for (i = 0; i < urb->number_of_packets; i++) {
651                         unsigned char *buf = urb->transfer_buffer +
652                                         urb->iso_frame_desc[i].offset;
653                         int len = urb->iso_frame_desc[i].actual_length - 4;
654
655                         if (urb->iso_frame_desc[i].status) {
656                                 em28xx_isocdbg("data error: [%d] len=%d, status=%d", i,
657                                         urb->iso_frame_desc[i].actual_length,
658                                         urb->iso_frame_desc[i].status);
659                                 if (urb->iso_frame_desc[i].status != -EPROTO)
660                                         continue;
661                         }
662                         if (urb->iso_frame_desc[i].actual_length <= 0) {
663                                 em28xx_isocdbg("packet %d is empty",i);
664                                 continue;
665                         }
666                         if (urb->iso_frame_desc[i].actual_length >
667                                                  dev->max_pkt_size) {
668                                 em28xx_isocdbg("packet bigger than packet size");
669                                 continue;
670                         }
671                         /*new frame */
672                         if (buf[0] == 0x22 && buf[1] == 0x5a) {
673                                 em28xx_isocdbg("Video frame, length=%i!",len);
674
675                                 if (em28xx_isoc_video(dev,f,&lock_flags,buf[2]))
676                                 break;
677                         } else if (buf[0]==0x33 && buf[1]==0x95 && buf[2]==0x00) {
678                                 em28xx_isocdbg("VBI HEADER!!!");
679                         }
680
681                         /* actual copying */
682                         if ((*f)->state == F_GRABBING) {
683                                 em28xx_isoc_video_copy(dev,f,buf, len);
684                         }
685                 }
686         }
687
688         for (i = 0; i < urb->number_of_packets; i++) {
689                 urb->iso_frame_desc[i].status = 0;
690                 urb->iso_frame_desc[i].actual_length = 0;
691         }
692
693         urb->status = 0;
694         if ((status = usb_submit_urb(urb, GFP_ATOMIC))) {
695                 em28xx_errdev("resubmit of urb failed (error=%i)\n", status);
696                 dev->state |= DEV_MISCONFIGURED;
697         }
698         wake_up_interruptible(&dev->wait_frame);
699         return;
700 }
701
702 /*
703  * em28xx_uninit_isoc()
704  * deallocates the buffers and urbs allocated during em28xx_init_iosc()
705  */
706 void em28xx_uninit_isoc(struct em28xx *dev)
707 {
708         int i;
709
710         for (i = 0; i < EM28XX_NUM_BUFS; i++) {
711                 if (dev->urb[i]) {
712                         usb_kill_urb(dev->urb[i]);
713                         if (dev->transfer_buffer[i]){
714                                 usb_buffer_free(dev->udev,(EM28XX_NUM_PACKETS*dev->max_pkt_size),dev->transfer_buffer[i],dev->urb[i]->transfer_dma);
715                         }
716                         usb_free_urb(dev->urb[i]);
717                 }
718                 dev->urb[i] = NULL;
719                 dev->transfer_buffer[i] = NULL;
720         }
721         em28xx_capture_start(dev, 0);
722 }
723
724 /*
725  * em28xx_init_isoc()
726  * allocates transfer buffers and submits the urbs for isoc transfer
727  */
728 int em28xx_init_isoc(struct em28xx *dev)
729 {
730         /* change interface to 3 which allows the biggest packet sizes */
731         int i, errCode;
732         const int sb_size = EM28XX_NUM_PACKETS * dev->max_pkt_size;
733
734         /* reset streaming vars */
735         dev->frame_current = NULL;
736         dev->frame_count = 0;
737
738         /* allocate urbs */
739         for (i = 0; i < EM28XX_NUM_BUFS; i++) {
740                 struct urb *urb;
741                 int j, k;
742                 /* allocate transfer buffer */
743                 urb = usb_alloc_urb(EM28XX_NUM_PACKETS, GFP_KERNEL);
744                 if (!urb){
745                         em28xx_errdev("cannot alloc urb %i\n", i);
746                         em28xx_uninit_isoc(dev);
747                         return -ENOMEM;
748                 }
749                 dev->transfer_buffer[i] = usb_buffer_alloc(dev->udev, sb_size, GFP_KERNEL,&urb->transfer_dma);
750                 if (!dev->transfer_buffer[i]) {
751                         em28xx_errdev
752                                         ("unable to allocate %i bytes for transfer buffer %i\n",
753                                          sb_size, i);
754                         em28xx_uninit_isoc(dev);
755                         usb_free_urb(urb);
756                         return -ENOMEM;
757                 }
758                 memset(dev->transfer_buffer[i], 0, sb_size);
759                 urb->dev = dev->udev;
760                 urb->context = dev;
761                 urb->pipe = usb_rcvisocpipe(dev->udev, 0x82);
762                 urb->transfer_flags = URB_ISO_ASAP;
763                 urb->interval = 1;
764                 urb->transfer_buffer = dev->transfer_buffer[i];
765                 urb->complete = em28xx_isocIrq;
766                 urb->number_of_packets = EM28XX_NUM_PACKETS;
767                 urb->transfer_buffer_length = sb_size;
768                 for (j = k = 0; j < EM28XX_NUM_PACKETS;
769                                 j++, k += dev->max_pkt_size) {
770                         urb->iso_frame_desc[j].offset = k;
771                         urb->iso_frame_desc[j].length =
772                                 dev->max_pkt_size;
773                 }
774                 dev->urb[i] = urb;
775         }
776
777         /* submit urbs */
778         for (i = 0; i < EM28XX_NUM_BUFS; i++) {
779                 errCode = usb_submit_urb(dev->urb[i], GFP_KERNEL);
780                 if (errCode) {
781                         em28xx_errdev("submit of urb %i failed (error=%i)\n", i,
782                                       errCode);
783                         em28xx_uninit_isoc(dev);
784                         return errCode;
785                 }
786         }
787
788         return 0;
789 }
790
791 int em28xx_set_alternate(struct em28xx *dev)
792 {
793         int errCode, prev_alt = dev->alt;
794         dev->alt = alt;
795         if (dev->alt == 0) {
796                 int i;
797                 for(i=0;i< dev->num_alt; i++)
798                         if(dev->alt_max_pkt_size[i]>dev->alt_max_pkt_size[dev->alt])
799                                 dev->alt=i;
800         }
801
802         if (dev->alt != prev_alt) {
803                 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
804                 em28xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n", dev->alt,
805                        dev->max_pkt_size);
806                 errCode = usb_set_interface(dev->udev, 0, dev->alt);
807                 if (errCode < 0) {
808                         em28xx_errdev ("cannot change alternate number to %d (error=%i)\n",
809                                                         dev->alt, errCode);
810                         return errCode;
811                 }
812         }
813         return 0;
814 }