V4L/DVB (7163): em28xx: makes audio settings more stable
[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, i;
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
265         /* Wait up to 50 ms for AC97 command to complete */
266         for (i = 0; i < 10; i++) {
267                 if ((ret = em28xx_read_reg(dev, AC97BUSY_REG)) < 0)
268                         return ret;
269                 if (!((u8) ret) & 0x01)
270                         return 0;
271                 msleep(5);
272         }
273         em28xx_warn ("AC97 command still being executed: not handled properly!\n");
274         return 0;
275 }
276
277 static int em28xx_set_audio_source(struct em28xx *dev)
278 {
279         static char *enable  = "\x08\x08";
280         static char *disable = "\x08\x88";
281         char *video = enable, *line = disable;
282         int ret;
283         u8 input;
284
285         if (dev->is_em2800) {
286                 if (dev->ctl_ainput)
287                         input = EM2800_AUDIO_SRC_LINE;
288                 else
289                         input = EM2800_AUDIO_SRC_TUNER;
290
291                 ret = em28xx_write_regs(dev, EM2800_AUDIOSRC_REG, &input, 1);
292                 if (ret < 0)
293                         return ret;
294         }
295
296         if (dev->has_msp34xx)
297                 input = EM28XX_AUDIO_SRC_TUNER;
298         else {
299                 switch (dev->ctl_ainput) {
300                 case EM28XX_AMUX_VIDEO:
301                         input = EM28XX_AUDIO_SRC_TUNER;
302                         break;
303                 case EM28XX_AMUX_LINE_IN:
304                         input = EM28XX_AUDIO_SRC_LINE;
305                         break;
306                 case EM28XX_AMUX_AC97_VIDEO:
307                         input = EM28XX_AUDIO_SRC_LINE;
308                         break;
309                 case EM28XX_AMUX_AC97_LINE_IN:
310                         input = EM28XX_AUDIO_SRC_LINE;
311                         video = disable;
312                         line  = enable;
313                         break;
314                 }
315         }
316
317         ret = em28xx_write_reg_bits(dev, AUDIOSRC_REG, input, 0xc0);
318         if (ret < 0)
319                 return ret;
320         msleep(5);
321
322         /* Sets AC97 mixer registers
323            This is seems to be needed, even for non-ac97 configs
324          */
325         ret = em28xx_write_ac97(dev, VIDEO_AC97, video);
326         if (ret < 0)
327                 return ret;
328
329         ret = em28xx_write_ac97(dev, LINE_IN_AC97, line);
330
331         return ret;
332 }
333
334 int em28xx_audio_analog_set(struct em28xx *dev)
335 {
336         int ret;
337         char s[2] = { 0x00, 0x00 };
338         u8 xclk = 0x07;
339
340         s[0] |= 0x1f - dev->volume;
341         s[1] |= 0x1f - dev->volume;
342
343         /* Mute */
344         s[1] |= 0x80;
345         ret = em28xx_write_ac97(dev, MASTER_AC97, s);
346
347         if (ret < 0)
348                 return ret;
349
350         if (dev->has_12mhz_i2s)
351                 xclk |= 0x20;
352
353         if (!dev->mute)
354                 xclk |= 0x80;
355
356         ret = em28xx_write_reg_bits(dev, XCLK_REG, xclk, 0xa7);
357         if (ret < 0)
358                 return ret;
359         msleep(10);
360
361         /* Selects the proper audio input */
362         ret = em28xx_set_audio_source(dev);
363
364         /* Unmute device */
365         if (!dev->mute)
366                 s[1] &= ~0x80;
367         ret = em28xx_write_ac97(dev, MASTER_AC97, s);
368
369         return ret;
370 }
371 EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
372
373 int em28xx_colorlevels_set_default(struct em28xx *dev)
374 {
375         em28xx_write_regs(dev, YGAIN_REG, "\x10", 1);   /* contrast */
376         em28xx_write_regs(dev, YOFFSET_REG, "\x00", 1); /* brightness */
377         em28xx_write_regs(dev, UVGAIN_REG, "\x10", 1);  /* saturation */
378         em28xx_write_regs(dev, UOFFSET_REG, "\x00", 1);
379         em28xx_write_regs(dev, VOFFSET_REG, "\x00", 1);
380         em28xx_write_regs(dev, SHARPNESS_REG, "\x00", 1);
381
382         em28xx_write_regs(dev, GAMMA_REG, "\x20", 1);
383         em28xx_write_regs(dev, RGAIN_REG, "\x20", 1);
384         em28xx_write_regs(dev, GGAIN_REG, "\x20", 1);
385         em28xx_write_regs(dev, BGAIN_REG, "\x20", 1);
386         em28xx_write_regs(dev, ROFFSET_REG, "\x00", 1);
387         em28xx_write_regs(dev, GOFFSET_REG, "\x00", 1);
388         return em28xx_write_regs(dev, BOFFSET_REG, "\x00", 1);
389 }
390
391 int em28xx_capture_start(struct em28xx *dev, int start)
392 {
393         int ret;
394         /* FIXME: which is the best order? */
395         /* video registers are sampled by VREF */
396         if ((ret = em28xx_write_reg_bits(dev, USBSUSP_REG, start ? 0x10 : 0x00,
397                                           0x10)) < 0)
398                 return ret;
399         /* enable video capture */
400         return em28xx_write_regs(dev, VINENABLE_REG, start ? "\x67" : "\x27", 1);
401 }
402
403 int em28xx_outfmt_set_yuv422(struct em28xx *dev)
404 {
405         em28xx_write_regs(dev, OUTFMT_REG, "\x34", 1);
406         em28xx_write_regs(dev, VINMODE_REG, "\x10", 1);
407         return em28xx_write_regs(dev, VINCTRL_REG, "\x11", 1);
408 }
409
410 static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
411                                   u8 ymin, u8 ymax)
412 {
413         em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n", xmin, ymin, xmax, ymax);
414
415         em28xx_write_regs(dev, XMIN_REG, &xmin, 1);
416         em28xx_write_regs(dev, XMAX_REG, &xmax, 1);
417         em28xx_write_regs(dev, YMIN_REG, &ymin, 1);
418         return em28xx_write_regs(dev, YMAX_REG, &ymax, 1);
419 }
420
421 static int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
422                                    u16 width, u16 height)
423 {
424         u8 cwidth = width;
425         u8 cheight = height;
426         u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
427
428         em28xx_coredbg("em28xx Area Set: (%d,%d)\n", (width | (overflow & 2) << 7),
429                         (height | (overflow & 1) << 8));
430
431         em28xx_write_regs(dev, HSTART_REG, &hstart, 1);
432         em28xx_write_regs(dev, VSTART_REG, &vstart, 1);
433         em28xx_write_regs(dev, CWIDTH_REG, &cwidth, 1);
434         em28xx_write_regs(dev, CHEIGHT_REG, &cheight, 1);
435         return em28xx_write_regs(dev, OFLOW_REG, &overflow, 1);
436 }
437
438 static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
439 {
440         u8 mode;
441         /* the em2800 scaler only supports scaling down to 50% */
442         if(dev->is_em2800)
443                 mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
444         else {
445                 u8 buf[2];
446                 buf[0] = h;
447                 buf[1] = h >> 8;
448                 em28xx_write_regs(dev, HSCALELOW_REG, (char *)buf, 2);
449                 buf[0] = v;
450                 buf[1] = v >> 8;
451                 em28xx_write_regs(dev, VSCALELOW_REG, (char *)buf, 2);
452                 /* it seems that both H and V scalers must be active to work correctly */
453                 mode = (h || v)? 0x30: 0x00;
454         }
455         return em28xx_write_reg_bits(dev, COMPR_REG, mode, 0x30);
456 }
457
458 /* FIXME: this only function read values from dev */
459 int em28xx_resolution_set(struct em28xx *dev)
460 {
461         int width, height;
462         width = norm_maxw(dev);
463         height = norm_maxh(dev) >> 1;
464
465         em28xx_outfmt_set_yuv422(dev);
466         em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
467         em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
468         return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
469 }
470
471
472 /******************* isoc transfer handling ****************************/
473
474 #ifdef ENABLE_DEBUG_ISOC_FRAMES
475 static void em28xx_isoc_dump(struct urb *urb)
476 {
477         int len = 0;
478         int ntrans = 0;
479         int i;
480
481         printk(KERN_DEBUG "isocIrq: sf=%d np=%d ec=%x\n",
482                urb->start_frame, urb->number_of_packets,
483                urb->error_count);
484         for (i = 0; i < urb->number_of_packets; i++) {
485                 unsigned char *buf =
486                                 urb->transfer_buffer +
487                                 urb->iso_frame_desc[i].offset;
488                 int alen = urb->iso_frame_desc[i].actual_length;
489                 if (alen > 0) {
490                         if (buf[0] == 0x88) {
491                                 ntrans++;
492                                 len += alen;
493                         } else if (buf[0] == 0x22) {
494                                 printk(KERN_DEBUG
495                                                 "= l=%d nt=%d bpp=%d\n",
496                                 len - 4 * ntrans, ntrans,
497                                 ntrans == 0 ? 0 : len / ntrans);
498                                 ntrans = 1;
499                                 len = alen;
500                         } else
501                                 printk(KERN_DEBUG "!\n");
502                 }
503                 printk(KERN_DEBUG "   n=%d s=%d al=%d %x\n", i,
504                        urb->iso_frame_desc[i].status,
505                        urb->iso_frame_desc[i].actual_length,
506                        (unsigned int)
507                                        *((unsigned char *)(urb->transfer_buffer +
508                                        urb->iso_frame_desc[i].
509                                        offset)));
510         }
511 }
512 #endif
513
514 static inline int em28xx_isoc_video(struct em28xx *dev,struct em28xx_frame_t **f,
515                                     unsigned long *lock_flags, unsigned char buf)
516 {
517         if (!(buf & 0x01)) {
518                 if ((*f)->state == F_GRABBING) {
519                         /*previous frame is incomplete */
520                         if ((*f)->fieldbytesused < dev->field_size) {
521                                 (*f)->state = F_ERROR;
522                                 em28xx_isocdbg ("dropping incomplete bottom field (%i missing bytes)",
523                                          dev->field_size-(*f)->fieldbytesused);
524                         } else {
525                                 (*f)->state = F_DONE;
526                                 (*f)->buf.bytesused = dev->frame_size;
527                         }
528                 }
529                 if ((*f)->state == F_DONE || (*f)->state == F_ERROR) {
530                         /* move current frame to outqueue and get next free buffer from inqueue */
531                         spin_lock_irqsave(&dev-> queue_lock, *lock_flags);
532                         list_move_tail(&(*f)->frame, &dev->outqueue);
533                         if (!list_empty(&dev->inqueue))
534                                 (*f) = list_entry(dev-> inqueue.next,
535                         struct em28xx_frame_t,frame);
536                         else
537                                 (*f) = NULL;
538                         spin_unlock_irqrestore(&dev->queue_lock,*lock_flags);
539                 }
540                 if (!(*f)) {
541                         em28xx_isocdbg ("new frame but no buffer is free");
542                         return -1;
543                 }
544                 do_gettimeofday(&(*f)->buf.timestamp);
545                 (*f)->buf.sequence = ++dev->frame_count;
546                 (*f)->buf.field = V4L2_FIELD_INTERLACED;
547                 (*f)->state = F_GRABBING;
548                 (*f)->buf.bytesused = 0;
549                 (*f)->top_field = 1;
550                 (*f)->fieldbytesused = 0;
551         } else {
552                                         /* acquiring bottom field */
553                 if ((*f)->state == F_GRABBING) {
554                         if (!(*f)->top_field) {
555                                 (*f)->state = F_ERROR;
556                                 em28xx_isocdbg ("unexpected begin of bottom field; discarding it");
557                         } else if ((*f)-> fieldbytesused < dev->field_size - 172) {
558                                 (*f)->state = F_ERROR;
559                                 em28xx_isocdbg ("dropping incomplete top field (%i missing bytes)",
560                                          dev->field_size-(*f)->fieldbytesused);
561                         } else {
562                                 (*f)->top_field = 0;
563                                 (*f)->fieldbytesused = 0;
564                         }
565                 }
566         }
567         return (0);
568 }
569
570 static inline void em28xx_isoc_video_copy(struct em28xx *dev,
571                                           struct em28xx_frame_t **f, unsigned char *buf, int len)
572 {
573         void *fieldstart, *startwrite, *startread;
574         int linesdone, currlinedone, offset, lencopy,remain;
575
576         if(dev->frame_size != (*f)->buf.length){
577                 em28xx_err("frame_size %i and buf.length %i are different!!!\n",dev->frame_size,(*f)->buf.length);
578                 return;
579         }
580
581         if ((*f)->fieldbytesused + len > dev->field_size)
582                 len =dev->field_size - (*f)->fieldbytesused;
583
584         if (buf[0] != 0x88 && buf[0] != 0x22) {
585                 em28xx_isocdbg("frame is not complete\n");
586                 startread = buf;
587                 len+=4;
588         } else
589                 startread = buf + 4;
590
591         remain = len;
592
593         if ((*f)->top_field)
594                 fieldstart = (*f)->bufmem;
595         else
596                 fieldstart = (*f)->bufmem + dev->bytesperline;
597
598         linesdone = (*f)->fieldbytesused / dev->bytesperline;
599         currlinedone = (*f)->fieldbytesused % dev->bytesperline;
600         offset = linesdone * dev->bytesperline * 2 + currlinedone;
601         startwrite = fieldstart + offset;
602         lencopy = dev->bytesperline - currlinedone;
603         lencopy = lencopy > remain ? remain : lencopy;
604
605         memcpy(startwrite, startread, lencopy);
606         remain -= lencopy;
607
608         while (remain > 0) {
609                 startwrite += lencopy + dev->bytesperline;
610                 startread += lencopy;
611                 if (dev->bytesperline > remain)
612                         lencopy = remain;
613                 else
614                         lencopy = dev->bytesperline;
615
616                 memcpy(startwrite, startread, lencopy);
617                 remain -= lencopy;
618         }
619
620         (*f)->fieldbytesused += len;
621 }
622
623 /*
624  * em28xx_isoIrq()
625  * handles the incoming isoc urbs and fills the frames from our inqueue
626  */
627 static void em28xx_isocIrq(struct urb *urb)
628 {
629         struct em28xx *dev = urb->context;
630         int i, status;
631         struct em28xx_frame_t **f;
632         unsigned long lock_flags;
633
634         if (!dev)
635                 return;
636 #ifdef ENABLE_DEBUG_ISOC_FRAMES
637         if (isoc_debug>1)
638                 em28xx_isoc_dump(urb);
639 #endif
640
641         if (urb->status == -ENOENT)
642                 return;
643
644         f = &dev->frame_current;
645
646         if (dev->stream == STREAM_INTERRUPT) {
647                 dev->stream = STREAM_OFF;
648                 if ((*f))
649                         (*f)->state = F_QUEUED;
650                 em28xx_isocdbg("stream interrupted");
651                 wake_up_interruptible(&dev->wait_stream);
652         }
653
654         if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
655                 return;
656
657         if (dev->stream == STREAM_ON && !list_empty(&dev->inqueue)) {
658                 if (!(*f))
659                         (*f) = list_entry(dev->inqueue.next,
660                 struct em28xx_frame_t, frame);
661
662                 for (i = 0; i < urb->number_of_packets; i++) {
663                         unsigned char *buf = urb->transfer_buffer +
664                                         urb->iso_frame_desc[i].offset;
665                         int len = urb->iso_frame_desc[i].actual_length - 4;
666
667                         if (urb->iso_frame_desc[i].status) {
668                                 em28xx_isocdbg("data error: [%d] len=%d, status=%d", i,
669                                         urb->iso_frame_desc[i].actual_length,
670                                         urb->iso_frame_desc[i].status);
671                                 if (urb->iso_frame_desc[i].status != -EPROTO)
672                                         continue;
673                         }
674                         if (urb->iso_frame_desc[i].actual_length <= 0) {
675                                 em28xx_isocdbg("packet %d is empty",i);
676                                 continue;
677                         }
678                         if (urb->iso_frame_desc[i].actual_length >
679                                                  dev->max_pkt_size) {
680                                 em28xx_isocdbg("packet bigger than packet size");
681                                 continue;
682                         }
683                         /*new frame */
684                         if (buf[0] == 0x22 && buf[1] == 0x5a) {
685                                 em28xx_isocdbg("Video frame, length=%i!",len);
686
687                                 if (em28xx_isoc_video(dev,f,&lock_flags,buf[2]))
688                                 break;
689                         } else if (buf[0]==0x33 && buf[1]==0x95 && buf[2]==0x00) {
690                                 em28xx_isocdbg("VBI HEADER!!!");
691                         }
692
693                         /* actual copying */
694                         if ((*f)->state == F_GRABBING) {
695                                 em28xx_isoc_video_copy(dev,f,buf, len);
696                         }
697                 }
698         }
699
700         for (i = 0; i < urb->number_of_packets; i++) {
701                 urb->iso_frame_desc[i].status = 0;
702                 urb->iso_frame_desc[i].actual_length = 0;
703         }
704
705         urb->status = 0;
706         if ((status = usb_submit_urb(urb, GFP_ATOMIC))) {
707                 em28xx_errdev("resubmit of urb failed (error=%i)\n", status);
708                 dev->state |= DEV_MISCONFIGURED;
709         }
710         wake_up_interruptible(&dev->wait_frame);
711         return;
712 }
713
714 /*
715  * em28xx_uninit_isoc()
716  * deallocates the buffers and urbs allocated during em28xx_init_iosc()
717  */
718 void em28xx_uninit_isoc(struct em28xx *dev)
719 {
720         int i;
721
722         for (i = 0; i < EM28XX_NUM_BUFS; i++) {
723                 if (dev->urb[i]) {
724                         usb_kill_urb(dev->urb[i]);
725                         if (dev->transfer_buffer[i]){
726                                 usb_buffer_free(dev->udev,(EM28XX_NUM_PACKETS*dev->max_pkt_size),dev->transfer_buffer[i],dev->urb[i]->transfer_dma);
727                         }
728                         usb_free_urb(dev->urb[i]);
729                 }
730                 dev->urb[i] = NULL;
731                 dev->transfer_buffer[i] = NULL;
732         }
733         em28xx_capture_start(dev, 0);
734 }
735
736 /*
737  * em28xx_init_isoc()
738  * allocates transfer buffers and submits the urbs for isoc transfer
739  */
740 int em28xx_init_isoc(struct em28xx *dev)
741 {
742         /* change interface to 3 which allows the biggest packet sizes */
743         int i, errCode;
744         const int sb_size = EM28XX_NUM_PACKETS * dev->max_pkt_size;
745
746         /* reset streaming vars */
747         dev->frame_current = NULL;
748         dev->frame_count = 0;
749
750         /* allocate urbs */
751         for (i = 0; i < EM28XX_NUM_BUFS; i++) {
752                 struct urb *urb;
753                 int j, k;
754                 /* allocate transfer buffer */
755                 urb = usb_alloc_urb(EM28XX_NUM_PACKETS, GFP_KERNEL);
756                 if (!urb){
757                         em28xx_errdev("cannot alloc urb %i\n", i);
758                         em28xx_uninit_isoc(dev);
759                         return -ENOMEM;
760                 }
761                 dev->transfer_buffer[i] = usb_buffer_alloc(dev->udev, sb_size, GFP_KERNEL,&urb->transfer_dma);
762                 if (!dev->transfer_buffer[i]) {
763                         em28xx_errdev
764                                         ("unable to allocate %i bytes for transfer buffer %i\n",
765                                          sb_size, i);
766                         em28xx_uninit_isoc(dev);
767                         usb_free_urb(urb);
768                         return -ENOMEM;
769                 }
770                 memset(dev->transfer_buffer[i], 0, sb_size);
771                 urb->dev = dev->udev;
772                 urb->context = dev;
773                 urb->pipe = usb_rcvisocpipe(dev->udev, 0x82);
774                 urb->transfer_flags = URB_ISO_ASAP;
775                 urb->interval = 1;
776                 urb->transfer_buffer = dev->transfer_buffer[i];
777                 urb->complete = em28xx_isocIrq;
778                 urb->number_of_packets = EM28XX_NUM_PACKETS;
779                 urb->transfer_buffer_length = sb_size;
780                 for (j = k = 0; j < EM28XX_NUM_PACKETS;
781                                 j++, k += dev->max_pkt_size) {
782                         urb->iso_frame_desc[j].offset = k;
783                         urb->iso_frame_desc[j].length =
784                                 dev->max_pkt_size;
785                 }
786                 dev->urb[i] = urb;
787         }
788
789         /* submit urbs */
790         for (i = 0; i < EM28XX_NUM_BUFS; i++) {
791                 errCode = usb_submit_urb(dev->urb[i], GFP_KERNEL);
792                 if (errCode) {
793                         em28xx_errdev("submit of urb %i failed (error=%i)\n", i,
794                                       errCode);
795                         em28xx_uninit_isoc(dev);
796                         return errCode;
797                 }
798         }
799
800         return 0;
801 }
802
803 int em28xx_set_alternate(struct em28xx *dev)
804 {
805         int errCode, prev_alt = dev->alt;
806         dev->alt = alt;
807         if (dev->alt == 0) {
808                 int i;
809                 for(i=0;i< dev->num_alt; i++)
810                         if(dev->alt_max_pkt_size[i]>dev->alt_max_pkt_size[dev->alt])
811                                 dev->alt=i;
812         }
813
814         if (dev->alt != prev_alt) {
815                 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
816                 em28xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n", dev->alt,
817                        dev->max_pkt_size);
818                 errCode = usb_set_interface(dev->udev, 0, dev->alt);
819                 if (errCode < 0) {
820                         em28xx_errdev ("cannot change alternate number to %d (error=%i)\n",
821                                                         dev->alt, errCode);
822                         return errCode;
823                 }
824         }
825         return 0;
826 }