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6965bafe54a1372a116c34151a9645a4c03cb8c1
[deliverable/linux.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 }
Linux kernel - Deliverables
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