?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
RT-AC66 3.0.0.4.374.130 core
[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / drivers / media / video / em28xx / em28xx-core.c
blob255a47dfb84fcaa76346385ec8f22970a889acc1
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/moduleparam.h>
28 #include <linux/usb.h>
29 #include <linux/vmalloc.h>
30
31 #include "em28xx.h"
32
33 /* #define ENABLE_DEBUG_ISOC_FRAMES */
34
35 static unsigned int core_debug = 0;
36 module_param(core_debug,int,0644);
37 MODULE_PARM_DESC(core_debug,"enable debug messages [core]");
38
39 #define em28xx_coredbg(fmt, arg...) do {\
40 if (core_debug) \
41 printk(KERN_INFO "%s %s :"fmt, \
42 dev->name, __FUNCTION__ , ##arg); } while (0)
43
44 static unsigned int reg_debug = 0;
45 module_param(reg_debug,int,0644);
46 MODULE_PARM_DESC(reg_debug,"enable debug messages [URB reg]");
47
48 #define em28xx_regdbg(fmt, arg...) do {\
49 if (reg_debug) \
50 printk(KERN_INFO "%s %s :"fmt, \
51 dev->name, __FUNCTION__ , ##arg); } while (0)
52
53 static unsigned int isoc_debug = 0;
54 module_param(isoc_debug,int,0644);
55 MODULE_PARM_DESC(isoc_debug,"enable debug messages [isoc transfers]");
56
57 #define em28xx_isocdbg(fmt, arg...) do {\
58 if (isoc_debug) \
59 printk(KERN_INFO "%s %s :"fmt, \
60 dev->name, __FUNCTION__ , ##arg); } while (0)
61
62 static int alt = EM28XX_PINOUT;
63 module_param(alt, int, 0644);
64 MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
65
66
67 /*
68 * em28xx_request_buffers()
69 * allocate a number of buffers
70 */
71 u32 em28xx_request_buffers(struct em28xx *dev, u32 count)
72 {
73 const size_t imagesize = PAGE_ALIGN(dev->frame_size); /*needs to be page aligned cause the buffers can be mapped individually! */
74 void *buff = NULL;
75 u32 i;
76 em28xx_coredbg("requested %i buffers with size %zi", count, imagesize);
77 if (count > EM28XX_NUM_FRAMES)
78 count = EM28XX_NUM_FRAMES;
79
80 dev->num_frames = count;
81 while (dev->num_frames > 0) {
82 if ((buff = vmalloc_32(dev->num_frames * imagesize))) {
83 memset(buff, 0, dev->num_frames * imagesize);
84 break;
85 }
86 dev->num_frames--;
87 }
88
89 for (i = 0; i < dev->num_frames; i++) {
90 dev->frame[i].bufmem = buff + i * imagesize;
91 dev->frame[i].buf.index = i;
92 dev->frame[i].buf.m.offset = i * imagesize;
93 dev->frame[i].buf.length = dev->frame_size;
94 dev->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
95 dev->frame[i].buf.sequence = 0;
96 dev->frame[i].buf.field = V4L2_FIELD_NONE;
97 dev->frame[i].buf.memory = V4L2_MEMORY_MMAP;
98 dev->frame[i].buf.flags = 0;
99 }
100 return dev->num_frames;
101 }
102
103 /*
104 * em28xx_queue_unusedframes()
105 * add all frames that are not currently in use to the inbuffer queue
106 */
107 void em28xx_queue_unusedframes(struct em28xx *dev)
108 {
109 unsigned long lock_flags;
110 u32 i;
111
112 for (i = 0; i < dev->num_frames; i++)
113 if (dev->frame[i].state == F_UNUSED) {
114 dev->frame[i].state = F_QUEUED;
115 spin_lock_irqsave(&dev->queue_lock, lock_flags);
116 list_add_tail(&dev->frame[i].frame, &dev->inqueue);
117 spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
118 }
119 }
120
121 /*
122 * em28xx_release_buffers()
123 * free frame buffers
124 */
125 void em28xx_release_buffers(struct em28xx *dev)
126 {
127 if (dev->num_frames) {
128 vfree(dev->frame[0].bufmem);
129 dev->num_frames = 0;
130 }
131 }
132
133 /*
134 * em28xx_read_reg_req()
135 * reads data from the usb device specifying bRequest
136 */
137 int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
138 char *buf, int len)
139 {
140 int ret, byte;
141
142 if (dev->state & DEV_DISCONNECTED)
143 return(-ENODEV);
144
145 em28xx_regdbg("req=%02x, reg=%02x ", req, reg);
146
147 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
148 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
149 0x0000, reg, buf, len, HZ);
150
151 if (reg_debug){
152 printk(ret < 0 ? " failed!\n" : "%02x values: ", ret);
153 for (byte = 0; byte < len; byte++) {
154 printk(" %02x", buf[byte]);
155 }
156 printk("\n");
157 }
158
159 return ret;
160 }
161
162 /*
163 * em28xx_read_reg_req()
164 * reads data from the usb device specifying bRequest
165 */
166 int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
167 {
168 u8 val;
169 int ret;
170
171 if (dev->state & DEV_DISCONNECTED)
172 return(-ENODEV);
173
174 em28xx_regdbg("req=%02x, reg=%02x:", req, reg);
175
176 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
177 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
178 0x0000, reg, &val, 1, HZ);
179
180 if (reg_debug)
181 printk(ret < 0 ? " failed!\n" : "%02x\n", 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 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 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_audio_analog_set(struct em28xx *dev)
273 {
274 char s[2] = { 0x00, 0x00 };
275 s[0] |= 0x1f - dev->volume;
276 s[1] |= 0x1f - dev->volume;
277 if (dev->mute)
278 s[1] |= 0x80;
279 return em28xx_write_ac97(dev, MASTER_AC97, s);
280 }
281
282
283 int em28xx_colorlevels_set_default(struct em28xx *dev)
284 {
285 em28xx_write_regs(dev, YGAIN_REG, "\x10", 1); /* contrast */
286 em28xx_write_regs(dev, YOFFSET_REG, "\x00", 1); /* brightness */
287 em28xx_write_regs(dev, UVGAIN_REG, "\x10", 1); /* saturation */
288 em28xx_write_regs(dev, UOFFSET_REG, "\x00", 1);
289 em28xx_write_regs(dev, VOFFSET_REG, "\x00", 1);
290 em28xx_write_regs(dev, SHARPNESS_REG, "\x00", 1);
291
292 em28xx_write_regs(dev, GAMMA_REG, "\x20", 1);
293 em28xx_write_regs(dev, RGAIN_REG, "\x20", 1);
294 em28xx_write_regs(dev, GGAIN_REG, "\x20", 1);
295 em28xx_write_regs(dev, BGAIN_REG, "\x20", 1);
296 em28xx_write_regs(dev, ROFFSET_REG, "\x00", 1);
297 em28xx_write_regs(dev, GOFFSET_REG, "\x00", 1);
298 return em28xx_write_regs(dev, BOFFSET_REG, "\x00", 1);
299 }
300
301 int em28xx_capture_start(struct em28xx *dev, int start)
302 {
303 int ret;
304 /* FIXME: which is the best order? */
305 /* video registers are sampled by VREF */
306 if ((ret = em28xx_write_reg_bits(dev, USBSUSP_REG, start ? 0x10 : 0x00,
307 0x10)) < 0)
308 return ret;
309 /* enable video capture */
310 return em28xx_write_regs(dev, VINENABLE_REG, start ? "\x67" : "\x27", 1);
311 }
312
313 int em28xx_outfmt_set_yuv422(struct em28xx *dev)
314 {
315 em28xx_write_regs(dev, OUTFMT_REG, "\x34", 1);
316 em28xx_write_regs(dev, VINMODE_REG, "\x10", 1);
317 return em28xx_write_regs(dev, VINCTRL_REG, "\x11", 1);
318 }
319
320 static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
321 u8 ymin, u8 ymax)
322 {
323 em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n", xmin, ymin, xmax, ymax);
324
325 em28xx_write_regs(dev, XMIN_REG, &xmin, 1);
326 em28xx_write_regs(dev, XMAX_REG, &xmax, 1);
327 em28xx_write_regs(dev, YMIN_REG, &ymin, 1);
328 return em28xx_write_regs(dev, YMAX_REG, &ymax, 1);
329 }
330
331 static int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
332 u16 width, u16 height)
333 {
334 u8 cwidth = width;
335 u8 cheight = height;
336 u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
337
338 em28xx_coredbg("em28xx Area Set: (%d,%d)\n", (width | (overflow & 2) << 7),
339 (height | (overflow & 1) << 8));
340
341 em28xx_write_regs(dev, HSTART_REG, &hstart, 1);
342 em28xx_write_regs(dev, VSTART_REG, &vstart, 1);
343 em28xx_write_regs(dev, CWIDTH_REG, &cwidth, 1);
344 em28xx_write_regs(dev, CHEIGHT_REG, &cheight, 1);
345 return em28xx_write_regs(dev, OFLOW_REG, &overflow, 1);
346 }
347
348 static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
349 {
350 u8 mode;
351 /* the em2800 scaler only supports scaling down to 50% */
352 if(dev->is_em2800)
353 mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
354 else {
355 u8 buf[2];
356 buf[0] = h;
357 buf[1] = h >> 8;
358 em28xx_write_regs(dev, HSCALELOW_REG, (char *)buf, 2);
359 buf[0] = v;
360 buf[1] = v >> 8;
361 em28xx_write_regs(dev, VSCALELOW_REG, (char *)buf, 2);
362 /* it seems that both H and V scalers must be active to work correctly */
363 mode = (h || v)? 0x30: 0x00;
364 }
365 return em28xx_write_reg_bits(dev, COMPR_REG, mode, 0x30);
366 }
367
368 /* FIXME: this only function read values from dev */
369 int em28xx_resolution_set(struct em28xx *dev)
370 {
371 int width, height;
372 width = norm_maxw(dev);
373 height = norm_maxh(dev) >> 1;
374
375 em28xx_outfmt_set_yuv422(dev);
376 em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
377 em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
378 return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
379 }
380
381
382 /******************* isoc transfer handling ****************************/
383
384 #ifdef ENABLE_DEBUG_ISOC_FRAMES
385 static void em28xx_isoc_dump(struct urb *urb)
386 {
387 int len = 0;
388 int ntrans = 0;
389 int i;
390
391 printk(KERN_DEBUG "isocIrq: sf=%d np=%d ec=%x\n",
392 urb->start_frame, urb->number_of_packets,
393 urb->error_count);
394 for (i = 0; i < urb->number_of_packets; i++) {
395 unsigned char *buf =
396 urb->transfer_buffer +
397 urb->iso_frame_desc[i].offset;
398 int alen = urb->iso_frame_desc[i].actual_length;
399 if (alen > 0) {
400 if (buf[0] == 0x88) {
401 ntrans++;
402 len += alen;
403 } else if (buf[0] == 0x22) {
404 printk(KERN_DEBUG
405 "= l=%d nt=%d bpp=%d\n",
406 len - 4 * ntrans, ntrans,
407 ntrans == 0 ? 0 : len / ntrans);
408 ntrans = 1;
409 len = alen;
410 } else
411 printk(KERN_DEBUG "!\n");
412 }
413 printk(KERN_DEBUG " n=%d s=%d al=%d %x\n", i,
414 urb->iso_frame_desc[i].status,
415 urb->iso_frame_desc[i].actual_length,
416 (unsigned int)
417 *((unsigned char *)(urb->transfer_buffer +
418 urb->iso_frame_desc[i].
419 offset)));
420 }
421 }
422 #endif
423
424 static inline int em28xx_isoc_video(struct em28xx *dev,struct em28xx_frame_t **f,
425 unsigned long *lock_flags, unsigned char buf)
426 {
427 if (!(buf & 0x01)) {
428 if ((*f)->state == F_GRABBING) {
429 /*previous frame is incomplete */
430 if ((*f)->fieldbytesused < dev->field_size) {
431 (*f)->state = F_ERROR;
432 em28xx_isocdbg ("dropping incomplete bottom field (%i missing bytes)",
433 dev->field_size-(*f)->fieldbytesused);
434 } else {
435 (*f)->state = F_DONE;
436 (*f)->buf.bytesused = dev->frame_size;
437 }
438 }
439 if ((*f)->state == F_DONE || (*f)->state == F_ERROR) {
440 /* move current frame to outqueue and get next free buffer from inqueue */
441 spin_lock_irqsave(&dev-> queue_lock, *lock_flags);
442 list_move_tail(&(*f)->frame, &dev->outqueue);
443 if (!list_empty(&dev->inqueue))
444 (*f) = list_entry(dev-> inqueue.next,
445 struct em28xx_frame_t,frame);
446 else
447 (*f) = NULL;
448 spin_unlock_irqrestore(&dev->queue_lock,*lock_flags);
449 }
450 if (!(*f)) {
451 em28xx_isocdbg ("new frame but no buffer is free");
452 return -1;
453 }
454 do_gettimeofday(&(*f)->buf.timestamp);
455 (*f)->buf.sequence = ++dev->frame_count;
456 (*f)->buf.field = V4L2_FIELD_INTERLACED;
457 (*f)->state = F_GRABBING;
458 (*f)->buf.bytesused = 0;
459 (*f)->top_field = 1;
460 (*f)->fieldbytesused = 0;
461 } else {
462 /* acquiring bottom field */
463 if ((*f)->state == F_GRABBING) {
464 if (!(*f)->top_field) {
465 (*f)->state = F_ERROR;
466 em28xx_isocdbg ("unexpected begin of bottom field; discarding it");
467 } else if ((*f)-> fieldbytesused < dev->field_size - 172) {
468 (*f)->state = F_ERROR;
469 em28xx_isocdbg ("dropping incomplete top field (%i missing bytes)",
470 dev->field_size-(*f)->fieldbytesused);
471 } else {
472 (*f)->top_field = 0;
473 (*f)->fieldbytesused = 0;
474 }
475 }
476 }
477 return (0);
478 }
479
480 static inline void em28xx_isoc_video_copy(struct em28xx *dev,
481 struct em28xx_frame_t **f, unsigned char *buf, int len)
482 {
483 void *fieldstart, *startwrite, *startread;
484 int linesdone, currlinedone, offset, lencopy,remain;
485
486 if(dev->frame_size != (*f)->buf.length){
487 em28xx_err("frame_size %i and buf.length %i are different!!!\n",dev->frame_size,(*f)->buf.length);
488 return;
489 }
490
491 if ((*f)->fieldbytesused + len > dev->field_size)
492 len =dev->field_size - (*f)->fieldbytesused;
493
494 if (buf[0] != 0x88 && buf[0] != 0x22) {
495 em28xx_isocdbg("frame is not complete\n");
496 startread = buf;
497 len+=4;
498 } else
499 startread = buf + 4;
500
501 remain = len;
502
503 if ((*f)->top_field)
504 fieldstart = (*f)->bufmem;
505 else
506 fieldstart = (*f)->bufmem + dev->bytesperline;
507
508 linesdone = (*f)->fieldbytesused / dev->bytesperline;
509 currlinedone = (*f)->fieldbytesused % dev->bytesperline;
510 offset = linesdone * dev->bytesperline * 2 + currlinedone;
511 startwrite = fieldstart + offset;
512 lencopy = dev->bytesperline - currlinedone;
513 lencopy = lencopy > remain ? remain : lencopy;
514
515 memcpy(startwrite, startread, lencopy);
516 remain -= lencopy;
517
518 while (remain > 0) {
519 startwrite += lencopy + dev->bytesperline;
520 startread += lencopy;
521 if (dev->bytesperline > remain)
522 lencopy = remain;
523 else
524 lencopy = dev->bytesperline;
525
526 memcpy(startwrite, startread, lencopy);
527 remain -= lencopy;
528 }
529
530 (*f)->fieldbytesused += len;
531 }
532
533 /*
534 * em28xx_isoIrq()
535 * handles the incoming isoc urbs and fills the frames from our inqueue
536 */
537 static void em28xx_isocIrq(struct urb *urb)
538 {
539 struct em28xx *dev = urb->context;
540 int i, status;
541 struct em28xx_frame_t **f;
542 unsigned long lock_flags;
543
544 if (!dev)
545 return;
546 #ifdef ENABLE_DEBUG_ISOC_FRAMES
547 if (isoc_debug>1)
548 em28xx_isoc_dump(urb);
549 #endif
550
551 if (urb->status == -ENOENT)
552 return;
553
554 f = &dev->frame_current;
555
556 if (dev->stream == STREAM_INTERRUPT) {
557 dev->stream = STREAM_OFF;
558 if ((*f))
559 (*f)->state = F_QUEUED;
560 em28xx_isocdbg("stream interrupted");
561 wake_up_interruptible(&dev->wait_stream);
562 }
563
564 if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
565 return;
566
567 if (dev->stream == STREAM_ON && !list_empty(&dev->inqueue)) {
568 if (!(*f))
569 (*f) = list_entry(dev->inqueue.next,
570 struct em28xx_frame_t, frame);
571
572 for (i = 0; i < urb->number_of_packets; i++) {
573 unsigned char *buf = urb->transfer_buffer +
574 urb->iso_frame_desc[i].offset;
575 int len = urb->iso_frame_desc[i].actual_length - 4;
576
577 if (urb->iso_frame_desc[i].status) {
578 em28xx_isocdbg("data error: [%d] len=%d, status=%d", i,
579 urb->iso_frame_desc[i].actual_length,
580 urb->iso_frame_desc[i].status);
581 if (urb->iso_frame_desc[i].status != -EPROTO)
582 continue;
583 }
584 if (urb->iso_frame_desc[i].actual_length <= 0) {
585 em28xx_isocdbg("packet %d is empty",i);
586 continue;
587 }
588 if (urb->iso_frame_desc[i].actual_length >
589 dev->max_pkt_size) {
590 em28xx_isocdbg("packet bigger than packet size");
591 continue;
592 }
593 /*new frame */
594 if (buf[0] == 0x22 && buf[1] == 0x5a) {
595 em28xx_isocdbg("Video frame, length=%i!",len);
596
597 if (em28xx_isoc_video(dev,f,&lock_flags,buf[2]))
598 break;
599 } else if (buf[0]==0x33 && buf[1]==0x95 && buf[2]==0x00) {
600 em28xx_isocdbg("VBI HEADER!!!");
601 }
602
603 /* actual copying */
604 if ((*f)->state == F_GRABBING) {
605 em28xx_isoc_video_copy(dev,f,buf, len);
606 }
607 }
608 }
609
610 for (i = 0; i < urb->number_of_packets; i++) {
611 urb->iso_frame_desc[i].status = 0;
612 urb->iso_frame_desc[i].actual_length = 0;
613 }
614
615 urb->status = 0;
616 if ((status = usb_submit_urb(urb, GFP_ATOMIC))) {
617 em28xx_errdev("resubmit of urb failed (error=%i)\n", status);
618 dev->state |= DEV_MISCONFIGURED;
619 }
620 wake_up_interruptible(&dev->wait_frame);
621 return;
622 }
623
624 /*
625 * em28xx_uninit_isoc()
626 * deallocates the buffers and urbs allocated during em28xx_init_iosc()
627 */
628 void em28xx_uninit_isoc(struct em28xx *dev)
629 {
630 int i;
631
632 for (i = 0; i < EM28XX_NUM_BUFS; i++) {
633 if (dev->urb[i]) {
634 usb_kill_urb(dev->urb[i]);
635 if (dev->transfer_buffer[i]){
636 usb_buffer_free(dev->udev,(EM28XX_NUM_PACKETS*dev->max_pkt_size),dev->transfer_buffer[i],dev->urb[i]->transfer_dma);
637 }
638 usb_free_urb(dev->urb[i]);
639 }
640 dev->urb[i] = NULL;
641 dev->transfer_buffer[i] = NULL;
642 }
643 em28xx_capture_start(dev, 0);
644 }
645
646 /*
647 * em28xx_init_isoc()
648 * allocates transfer buffers and submits the urbs for isoc transfer
649 */
650 int em28xx_init_isoc(struct em28xx *dev)
651 {
652 /* change interface to 3 which allowes the biggest packet sizes */
653 int i, errCode;
654 const int sb_size = EM28XX_NUM_PACKETS * dev->max_pkt_size;
655
656 /* reset streaming vars */
657 dev->frame_current = NULL;
658 dev->frame_count = 0;
659
660 /* allocate urbs */
661 for (i = 0; i < EM28XX_NUM_BUFS; i++) {
662 struct urb *urb;
663 int j, k;
664 /* allocate transfer buffer */
665 urb = usb_alloc_urb(EM28XX_NUM_PACKETS, GFP_KERNEL);
666 if (!urb){
667 em28xx_errdev("cannot alloc urb %i\n", i);
668 em28xx_uninit_isoc(dev);
669 return -ENOMEM;
670 }
671 dev->transfer_buffer[i] = usb_buffer_alloc(dev->udev, sb_size, GFP_KERNEL,&urb->transfer_dma);
672 if (!dev->transfer_buffer[i]) {
673 em28xx_errdev
674 ("unable to allocate %i bytes for transfer buffer %i\n",
675 sb_size, i);
676 em28xx_uninit_isoc(dev);
677 return -ENOMEM;
678 }
679 memset(dev->transfer_buffer[i], 0, sb_size);
680 urb->dev = dev->udev;
681 urb->context = dev;
682 urb->pipe = usb_rcvisocpipe(dev->udev, 0x82);
683 urb->transfer_flags = URB_ISO_ASAP;
684 urb->interval = 1;
685 urb->transfer_buffer = dev->transfer_buffer[i];
686 urb->complete = em28xx_isocIrq;
687 urb->number_of_packets = EM28XX_NUM_PACKETS;
688 urb->transfer_buffer_length = sb_size;
689 for (j = k = 0; j < EM28XX_NUM_PACKETS;
690 j++, k += dev->max_pkt_size) {
691 urb->iso_frame_desc[j].offset = k;
692 urb->iso_frame_desc[j].length =
693 dev->max_pkt_size;
694 }
695 dev->urb[i] = urb;
696 }
697
698 /* submit urbs */
699 for (i = 0; i < EM28XX_NUM_BUFS; i++) {
700 errCode = usb_submit_urb(dev->urb[i], GFP_KERNEL);
701 if (errCode) {
702 em28xx_errdev("submit of urb %i failed (error=%i)\n", i,
703 errCode);
704 em28xx_uninit_isoc(dev);
705 return errCode;
706 }
707 }
708
709 return 0;
710 }
711
712 int em28xx_set_alternate(struct em28xx *dev)
713 {
714 int errCode, prev_alt = dev->alt;
715 dev->alt = alt;
716 if (dev->alt == 0) {
717 int i;
718 for(i=0;i< dev->num_alt; i++)
719 if(dev->alt_max_pkt_size[i]>dev->alt_max_pkt_size[dev->alt])
720 dev->alt=i;
721 }
722
723 if (dev->alt != prev_alt) {
724 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
725 em28xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n", dev->alt,
726 dev->max_pkt_size);
727 errCode = usb_set_interface(dev->udev, 0, dev->alt);
728 if (errCode < 0) {
729 em28xx_errdev ("cannot change alternate number to %d (error=%i)\n",
730 dev->alt, errCode);
731 return errCode;
732 }
733 }
734 return 0;
735 }
Tomato firmware and modifications.