f6b78357f0e517633f10bc5c7186b6be3d957085
[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", 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" : "%02x\n", val);
181
182         if (ret < 0)
183                 return ret;
184
185         return val;
186 }
187
188 int em28xx_read_reg(struct em28xx *dev, u16 reg)
189 {
190         return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
191 }
192
193 /*
194  * em28xx_write_regs_req()
195  * sends data to the usb device, specifying bRequest
196  */
197 int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
198                                  int len)
199 {
200         int ret;
201
202         /*usb_control_msg seems to expect a kmalloced buffer */
203         unsigned char *bufs;
204
205         if (dev->state & DEV_DISCONNECTED)
206                 return(-ENODEV);
207
208         bufs = kmalloc(len, GFP_KERNEL);
209
210         em28xx_regdbg("req=%02x reg=%02x:", req, reg);
211
212         if (reg_debug) {
213                 int i;
214                 for (i = 0; i < len; ++i)
215                         printk (" %02x", (unsigned char)buf[i]);
216                 printk ("\n");
217         }
218
219         if (!bufs)
220                 return -ENOMEM;
221         memcpy(bufs, buf, len);
222         ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), req,
223                               USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
224                               0x0000, reg, bufs, len, HZ);
225         msleep(5);              /* FIXME: magic number */
226         kfree(bufs);
227         return ret;
228 }
229
230 int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
231 {
232         return em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
233 }
234
235 /*
236  * em28xx_write_reg_bits()
237  * sets only some bits (specified by bitmask) of a register, by first reading
238  * the actual value
239  */
240 int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
241                                  u8 bitmask)
242 {
243         int oldval;
244         u8 newval;
245         if ((oldval = em28xx_read_reg(dev, reg)) < 0)
246                 return oldval;
247         newval = (((u8) oldval) & ~bitmask) | (val & bitmask);
248         return em28xx_write_regs(dev, reg, &newval, 1);
249 }
250
251 /*
252  * em28xx_write_ac97()
253  * write a 16 bit value to the specified AC97 address (LSB first!)
254  */
255 static int em28xx_write_ac97(struct em28xx *dev, u8 reg, u8 *val)
256 {
257         int ret;
258         u8 addr = reg & 0x7f;
259         if ((ret = em28xx_write_regs(dev, AC97LSB_REG, val, 2)) < 0)
260                 return ret;
261         if ((ret = em28xx_write_regs(dev, AC97ADDR_REG, &addr, 1)) < 0)
262                 return ret;
263         if ((ret = em28xx_read_reg(dev, AC97BUSY_REG)) < 0)
264                 return ret;
265         else if (((u8) ret) & 0x01) {
266                 em28xx_warn ("AC97 command still being executed: not handled properly!\n");
267         }
268         return 0;
269 }
270
271 int em28xx_set_audio_source(struct em28xx *dev)
272 {
273         static char *enable  = "\x08\x08";
274         static char *disable = "\x08\x88";
275         char *video = enable, *line = disable;
276         int ret, no_ac97;
277         u8 input;
278
279         if (dev->is_em2800) {
280                 if (dev->ctl_ainput)
281                         input = EM2800_AUDIO_SRC_LINE;
282                 else
283                         input = EM2800_AUDIO_SRC_TUNER;
284
285                 ret = em28xx_write_regs(dev, EM2800_AUDIOSRC_REG, &input, 1);
286                 if (ret < 0)
287                         return ret;
288         }
289
290         if (dev->has_msp34xx)
291                 input = EM28XX_AUDIO_SRC_TUNER;
292         else {
293                 switch (dev->ctl_ainput) {
294                 case EM28XX_AMUX_VIDEO:
295                         input = EM28XX_AUDIO_SRC_TUNER;
296                         no_ac97 = 1;
297                         break;
298                 case EM28XX_AMUX_LINE_IN:
299                         input = EM28XX_AUDIO_SRC_LINE;
300                         no_ac97 = 1;
301                         break;
302                 case EM28XX_AMUX_AC97_VIDEO:
303                         input = EM28XX_AUDIO_SRC_LINE;
304                         break;
305                 case EM28XX_AMUX_AC97_LINE_IN:
306                         input = EM28XX_AUDIO_SRC_LINE;
307                         video = disable;
308                         line  = enable;
309                         break;
310                 }
311         }
312
313         ret = em28xx_write_reg_bits(dev, AUDIOSRC_REG, input, 0xc0);
314         if (ret < 0)
315                 return ret;
316
317         if (no_ac97)
318                 return 0;
319
320         /* Sets AC97 mixer registers */
321
322         ret = em28xx_write_ac97(dev, VIDEO_AC97, video);
323         if (ret < 0)
324                 return ret;
325
326         ret = em28xx_write_ac97(dev, LINE_IN_AC97, line);
327
328         return ret;
329 }
330
331 int em28xx_audio_analog_set(struct em28xx *dev)
332 {
333         int ret;
334         char s[2] = { 0x00, 0x00 };
335         u8 xclk = 0x07;
336
337         s[0] |= 0x1f - dev->volume;
338         s[1] |= 0x1f - dev->volume;
339
340         if (dev->mute)
341                 s[1] |= 0x80;
342         ret = em28xx_write_ac97(dev, MASTER_AC97, s);
343         if (ret < 0)
344                 return ret;
345
346         if (dev->has_12mhz_i2s)
347                 xclk |= 0x20;
348
349         if (!dev->mute)
350                 xclk |= 0x80;
351
352         ret = em28xx_write_reg_bits(dev, XCLK_REG, xclk, 0xa7);
353         if (ret < 0)
354                 return ret;
355         msleep(10);
356
357         /* Selects the proper audio input */
358         ret = em28xx_set_audio_source(dev);
359
360         return ret;
361 }
362 EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
363
364 int em28xx_colorlevels_set_default(struct em28xx *dev)
365 {
366         em28xx_write_regs(dev, YGAIN_REG, "\x10", 1);   /* contrast */
367         em28xx_write_regs(dev, YOFFSET_REG, "\x00", 1); /* brightness */
368         em28xx_write_regs(dev, UVGAIN_REG, "\x10", 1);  /* saturation */
369         em28xx_write_regs(dev, UOFFSET_REG, "\x00", 1);
370         em28xx_write_regs(dev, VOFFSET_REG, "\x00", 1);
371         em28xx_write_regs(dev, SHARPNESS_REG, "\x00", 1);
372
373         em28xx_write_regs(dev, GAMMA_REG, "\x20", 1);
374         em28xx_write_regs(dev, RGAIN_REG, "\x20", 1);
375         em28xx_write_regs(dev, GGAIN_REG, "\x20", 1);
376         em28xx_write_regs(dev, BGAIN_REG, "\x20", 1);
377         em28xx_write_regs(dev, ROFFSET_REG, "\x00", 1);
378         em28xx_write_regs(dev, GOFFSET_REG, "\x00", 1);
379         return em28xx_write_regs(dev, BOFFSET_REG, "\x00", 1);
380 }
381
382 int em28xx_capture_start(struct em28xx *dev, int start)
383 {
384         int ret;
385         /* FIXME: which is the best order? */
386         /* video registers are sampled by VREF */
387         if ((ret = em28xx_write_reg_bits(dev, USBSUSP_REG, start ? 0x10 : 0x00,
388                                           0x10)) < 0)
389                 return ret;
390         /* enable video capture */
391         return em28xx_write_regs(dev, VINENABLE_REG, start ? "\x67" : "\x27", 1);
392 }
393
394 int em28xx_outfmt_set_yuv422(struct em28xx *dev)
395 {
396         em28xx_write_regs(dev, OUTFMT_REG, "\x34", 1);
397         em28xx_write_regs(dev, VINMODE_REG, "\x10", 1);
398         return em28xx_write_regs(dev, VINCTRL_REG, "\x11", 1);
399 }
400
401 static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
402                                   u8 ymin, u8 ymax)
403 {
404         em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n", xmin, ymin, xmax, ymax);
405
406         em28xx_write_regs(dev, XMIN_REG, &xmin, 1);
407         em28xx_write_regs(dev, XMAX_REG, &xmax, 1);
408         em28xx_write_regs(dev, YMIN_REG, &ymin, 1);
409         return em28xx_write_regs(dev, YMAX_REG, &ymax, 1);
410 }
411
412 static int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
413                                    u16 width, u16 height)
414 {
415         u8 cwidth = width;
416         u8 cheight = height;
417         u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
418
419         em28xx_coredbg("em28xx Area Set: (%d,%d)\n", (width | (overflow & 2) << 7),
420                         (height | (overflow & 1) << 8));
421
422         em28xx_write_regs(dev, HSTART_REG, &hstart, 1);
423         em28xx_write_regs(dev, VSTART_REG, &vstart, 1);
424         em28xx_write_regs(dev, CWIDTH_REG, &cwidth, 1);
425         em28xx_write_regs(dev, CHEIGHT_REG, &cheight, 1);
426         return em28xx_write_regs(dev, OFLOW_REG, &overflow, 1);
427 }
428
429 static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
430 {
431         u8 mode;
432         /* the em2800 scaler only supports scaling down to 50% */
433         if(dev->is_em2800)
434                 mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
435         else {
436                 u8 buf[2];
437                 buf[0] = h;
438                 buf[1] = h >> 8;
439                 em28xx_write_regs(dev, HSCALELOW_REG, (char *)buf, 2);
440                 buf[0] = v;
441                 buf[1] = v >> 8;
442                 em28xx_write_regs(dev, VSCALELOW_REG, (char *)buf, 2);
443                 /* it seems that both H and V scalers must be active to work correctly */
444                 mode = (h || v)? 0x30: 0x00;
445         }
446         return em28xx_write_reg_bits(dev, COMPR_REG, mode, 0x30);
447 }
448
449 /* FIXME: this only function read values from dev */
450 int em28xx_resolution_set(struct em28xx *dev)
451 {
452         int width, height;
453         width = norm_maxw(dev);
454         height = norm_maxh(dev) >> 1;
455
456         em28xx_outfmt_set_yuv422(dev);
457         em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
458         em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
459         return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
460 }
461
462
463 /******************* isoc transfer handling ****************************/
464
465 #ifdef ENABLE_DEBUG_ISOC_FRAMES
466 static void em28xx_isoc_dump(struct urb *urb)
467 {
468         int len = 0;
469         int ntrans = 0;
470         int i;
471
472         printk(KERN_DEBUG "isocIrq: sf=%d np=%d ec=%x\n",
473                urb->start_frame, urb->number_of_packets,
474                urb->error_count);
475         for (i = 0; i < urb->number_of_packets; i++) {
476                 unsigned char *buf =
477                                 urb->transfer_buffer +
478                                 urb->iso_frame_desc[i].offset;
479                 int alen = urb->iso_frame_desc[i].actual_length;
480                 if (alen > 0) {
481                         if (buf[0] == 0x88) {
482                                 ntrans++;
483                                 len += alen;
484                         } else if (buf[0] == 0x22) {
485                                 printk(KERN_DEBUG
486                                                 "= l=%d nt=%d bpp=%d\n",
487                                 len - 4 * ntrans, ntrans,
488                                 ntrans == 0 ? 0 : len / ntrans);
489                                 ntrans = 1;
490                                 len = alen;
491                         } else
492                                 printk(KERN_DEBUG "!\n");
493                 }
494                 printk(KERN_DEBUG "   n=%d s=%d al=%d %x\n", i,
495                        urb->iso_frame_desc[i].status,
496                        urb->iso_frame_desc[i].actual_length,
497                        (unsigned int)
498                                        *((unsigned char *)(urb->transfer_buffer +
499                                        urb->iso_frame_desc[i].
500                                        offset)));
501         }
502 }
503 #endif
504
505 static inline int em28xx_isoc_video(struct em28xx *dev,struct em28xx_frame_t **f,
506                                     unsigned long *lock_flags, unsigned char buf)
507 {
508         if (!(buf & 0x01)) {
509                 if ((*f)->state == F_GRABBING) {
510                         /*previous frame is incomplete */
511                         if ((*f)->fieldbytesused < dev->field_size) {
512                                 (*f)->state = F_ERROR;
513                                 em28xx_isocdbg ("dropping incomplete bottom field (%i missing bytes)",
514                                          dev->field_size-(*f)->fieldbytesused);
515                         } else {
516                                 (*f)->state = F_DONE;
517                                 (*f)->buf.bytesused = dev->frame_size;
518                         }
519                 }
520                 if ((*f)->state == F_DONE || (*f)->state == F_ERROR) {
521                         /* move current frame to outqueue and get next free buffer from inqueue */
522                         spin_lock_irqsave(&dev-> queue_lock, *lock_flags);
523                         list_move_tail(&(*f)->frame, &dev->outqueue);
524                         if (!list_empty(&dev->inqueue))
525                                 (*f) = list_entry(dev-> inqueue.next,
526                         struct em28xx_frame_t,frame);
527                         else
528                                 (*f) = NULL;
529                         spin_unlock_irqrestore(&dev->queue_lock,*lock_flags);
530                 }
531                 if (!(*f)) {
532                         em28xx_isocdbg ("new frame but no buffer is free");
533                         return -1;
534                 }
535                 do_gettimeofday(&(*f)->buf.timestamp);
536                 (*f)->buf.sequence = ++dev->frame_count;
537                 (*f)->buf.field = V4L2_FIELD_INTERLACED;
538                 (*f)->state = F_GRABBING;
539                 (*f)->buf.bytesused = 0;
540                 (*f)->top_field = 1;
541                 (*f)->fieldbytesused = 0;
542         } else {
543                                         /* acquiring bottom field */
544                 if ((*f)->state == F_GRABBING) {
545                         if (!(*f)->top_field) {
546                                 (*f)->state = F_ERROR;
547                                 em28xx_isocdbg ("unexpected begin of bottom field; discarding it");
548                         } else if ((*f)-> fieldbytesused < dev->field_size - 172) {
549                                 (*f)->state = F_ERROR;
550                                 em28xx_isocdbg ("dropping incomplete top field (%i missing bytes)",
551                                          dev->field_size-(*f)->fieldbytesused);
552                         } else {
553                                 (*f)->top_field = 0;
554                                 (*f)->fieldbytesused = 0;
555                         }
556                 }
557         }
558         return (0);
559 }
560
561 static inline void em28xx_isoc_video_copy(struct em28xx *dev,
562                                           struct em28xx_frame_t **f, unsigned char *buf, int len)
563 {
564         void *fieldstart, *startwrite, *startread;
565         int linesdone, currlinedone, offset, lencopy,remain;
566
567         if(dev->frame_size != (*f)->buf.length){
568                 em28xx_err("frame_size %i and buf.length %i are different!!!\n",dev->frame_size,(*f)->buf.length);
569                 return;
570         }
571
572         if ((*f)->fieldbytesused + len > dev->field_size)
573                 len =dev->field_size - (*f)->fieldbytesused;
574
575         if (buf[0] != 0x88 && buf[0] != 0x22) {
576                 em28xx_isocdbg("frame is not complete\n");
577                 startread = buf;
578                 len+=4;
579         } else
580                 startread = buf + 4;
581
582         remain = len;
583
584         if ((*f)->top_field)
585                 fieldstart = (*f)->bufmem;
586         else
587                 fieldstart = (*f)->bufmem + dev->bytesperline;
588
589         linesdone = (*f)->fieldbytesused / dev->bytesperline;
590         currlinedone = (*f)->fieldbytesused % dev->bytesperline;
591         offset = linesdone * dev->bytesperline * 2 + currlinedone;
592         startwrite = fieldstart + offset;
593         lencopy = dev->bytesperline - currlinedone;
594         lencopy = lencopy > remain ? remain : lencopy;
595
596         memcpy(startwrite, startread, lencopy);
597         remain -= lencopy;
598
599         while (remain > 0) {
600                 startwrite += lencopy + dev->bytesperline;
601                 startread += lencopy;
602                 if (dev->bytesperline > remain)
603                         lencopy = remain;
604                 else
605                         lencopy = dev->bytesperline;
606
607                 memcpy(startwrite, startread, lencopy);
608                 remain -= lencopy;
609         }
610
611         (*f)->fieldbytesused += len;
612 }
613
614 /*
615  * em28xx_isoIrq()
616  * handles the incoming isoc urbs and fills the frames from our inqueue
617  */
618 static void em28xx_isocIrq(struct urb *urb)
619 {
620         struct em28xx *dev = urb->context;
621         int i, status;
622         struct em28xx_frame_t **f;
623         unsigned long lock_flags;
624
625         if (!dev)
626                 return;
627 #ifdef ENABLE_DEBUG_ISOC_FRAMES
628         if (isoc_debug>1)
629                 em28xx_isoc_dump(urb);
630 #endif
631
632         if (urb->status == -ENOENT)
633                 return;
634
635         f = &dev->frame_current;
636
637         if (dev->stream == STREAM_INTERRUPT) {
638                 dev->stream = STREAM_OFF;
639                 if ((*f))
640                         (*f)->state = F_QUEUED;
641                 em28xx_isocdbg("stream interrupted");
642                 wake_up_interruptible(&dev->wait_stream);
643         }
644
645         if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
646                 return;
647
648         if (dev->stream == STREAM_ON && !list_empty(&dev->inqueue)) {
649                 if (!(*f))
650                         (*f) = list_entry(dev->inqueue.next,
651                 struct em28xx_frame_t, frame);
652
653                 for (i = 0; i < urb->number_of_packets; i++) {
654                         unsigned char *buf = urb->transfer_buffer +
655                                         urb->iso_frame_desc[i].offset;
656                         int len = urb->iso_frame_desc[i].actual_length - 4;
657
658                         if (urb->iso_frame_desc[i].status) {
659                                 em28xx_isocdbg("data error: [%d] len=%d, status=%d", i,
660                                         urb->iso_frame_desc[i].actual_length,
661                                         urb->iso_frame_desc[i].status);
662                                 if (urb->iso_frame_desc[i].status != -EPROTO)
663                                         continue;
664                         }
665                         if (urb->iso_frame_desc[i].actual_length <= 0) {
666                                 em28xx_isocdbg("packet %d is empty",i);
667                                 continue;
668                         }
669                         if (urb->iso_frame_desc[i].actual_length >
670                                                  dev->max_pkt_size) {
671                                 em28xx_isocdbg("packet bigger than packet size");
672                                 continue;
673                         }
674                         /*new frame */
675                         if (buf[0] == 0x22 && buf[1] == 0x5a) {
676                                 em28xx_isocdbg("Video frame, length=%i!",len);
677
678                                 if (em28xx_isoc_video(dev,f,&lock_flags,buf[2]))
679                                 break;
680                         } else if (buf[0]==0x33 && buf[1]==0x95 && buf[2]==0x00) {
681                                 em28xx_isocdbg("VBI HEADER!!!");
682                         }
683
684                         /* actual copying */
685                         if ((*f)->state == F_GRABBING) {
686                                 em28xx_isoc_video_copy(dev,f,buf, len);
687                         }
688                 }
689         }
690
691         for (i = 0; i < urb->number_of_packets; i++) {
692                 urb->iso_frame_desc[i].status = 0;
693                 urb->iso_frame_desc[i].actual_length = 0;
694         }
695
696         urb->status = 0;
697         if ((status = usb_submit_urb(urb, GFP_ATOMIC))) {
698                 em28xx_errdev("resubmit of urb failed (error=%i)\n", status);
699                 dev->state |= DEV_MISCONFIGURED;
700         }
701         wake_up_interruptible(&dev->wait_frame);
702         return;
703 }
704
705 /*
706  * em28xx_uninit_isoc()
707  * deallocates the buffers and urbs allocated during em28xx_init_iosc()
708  */
709 void em28xx_uninit_isoc(struct em28xx *dev)
710 {
711         int i;
712
713         for (i = 0; i < EM28XX_NUM_BUFS; i++) {
714                 if (dev->urb[i]) {
715                         usb_kill_urb(dev->urb[i]);
716                         if (dev->transfer_buffer[i]){
717                                 usb_buffer_free(dev->udev,(EM28XX_NUM_PACKETS*dev->max_pkt_size),dev->transfer_buffer[i],dev->urb[i]->transfer_dma);
718                         }
719                         usb_free_urb(dev->urb[i]);
720                 }
721                 dev->urb[i] = NULL;
722                 dev->transfer_buffer[i] = NULL;
723         }
724         em28xx_capture_start(dev, 0);
725 }
726
727 /*
728  * em28xx_init_isoc()
729  * allocates transfer buffers and submits the urbs for isoc transfer
730  */
731 int em28xx_init_isoc(struct em28xx *dev)
732 {
733         /* change interface to 3 which allows the biggest packet sizes */
734         int i, errCode;
735         const int sb_size = EM28XX_NUM_PACKETS * dev->max_pkt_size;
736
737         /* reset streaming vars */
738         dev->frame_current = NULL;
739         dev->frame_count = 0;
740
741         /* allocate urbs */
742         for (i = 0; i < EM28XX_NUM_BUFS; i++) {
743                 struct urb *urb;
744                 int j, k;
745                 /* allocate transfer buffer */
746                 urb = usb_alloc_urb(EM28XX_NUM_PACKETS, GFP_KERNEL);
747                 if (!urb){
748                         em28xx_errdev("cannot alloc urb %i\n", i);
749                         em28xx_uninit_isoc(dev);
750                         return -ENOMEM;
751                 }
752                 dev->transfer_buffer[i] = usb_buffer_alloc(dev->udev, sb_size, GFP_KERNEL,&urb->transfer_dma);
753                 if (!dev->transfer_buffer[i]) {
754                         em28xx_errdev
755                                         ("unable to allocate %i bytes for transfer buffer %i\n",
756                                          sb_size, i);
757                         em28xx_uninit_isoc(dev);
758                         usb_free_urb(urb);
759                         return -ENOMEM;
760                 }
761                 memset(dev->transfer_buffer[i], 0, sb_size);
762                 urb->dev = dev->udev;
763                 urb->context = dev;
764                 urb->pipe = usb_rcvisocpipe(dev->udev, 0x82);
765                 urb->transfer_flags = URB_ISO_ASAP;
766                 urb->interval = 1;
767                 urb->transfer_buffer = dev->transfer_buffer[i];
768                 urb->complete = em28xx_isocIrq;
769                 urb->number_of_packets = EM28XX_NUM_PACKETS;
770                 urb->transfer_buffer_length = sb_size;
771                 for (j = k = 0; j < EM28XX_NUM_PACKETS;
772                                 j++, k += dev->max_pkt_size) {
773                         urb->iso_frame_desc[j].offset = k;
774                         urb->iso_frame_desc[j].length =
775                                 dev->max_pkt_size;
776                 }
777                 dev->urb[i] = urb;
778         }
779
780         /* submit urbs */
781         for (i = 0; i < EM28XX_NUM_BUFS; i++) {
782                 errCode = usb_submit_urb(dev->urb[i], GFP_KERNEL);
783                 if (errCode) {
784                         em28xx_errdev("submit of urb %i failed (error=%i)\n", i,
785                                       errCode);
786                         em28xx_uninit_isoc(dev);
787                         return errCode;
788                 }
789         }
790
791         return 0;
792 }
793
794 int em28xx_set_alternate(struct em28xx *dev)
795 {
796         int errCode, prev_alt = dev->alt;
797         dev->alt = alt;
798         if (dev->alt == 0) {
799                 int i;
800                 for(i=0;i< dev->num_alt; i++)
801                         if(dev->alt_max_pkt_size[i]>dev->alt_max_pkt_size[dev->alt])
802                                 dev->alt=i;
803         }
804
805         if (dev->alt != prev_alt) {
806                 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
807                 em28xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n", dev->alt,
808                        dev->max_pkt_size);
809                 errCode = usb_set_interface(dev->udev, 0, dev->alt);
810                 if (errCode < 0) {
811                         em28xx_errdev ("cannot change alternate number to %d (error=%i)\n",
812                                                         dev->alt, errCode);
813                         return errCode;
814                 }
815         }
816         return 0;
817 }