?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
pcmcia: CompactFlash driver for PA Semi Electra boards
[pv_ops_mirror.git] / drivers / media / video / em28xx / em28xx-core.c
blobd3282ec62c5be2e1382a2bc01dc5f4755bdd2a7e
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 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_audio_analog_set(struct em28xx *dev)
272 {
273 char s[2] = { 0x00, 0x00 };
274 s[0] |= 0x1f - dev->volume;
275 s[1] |= 0x1f - dev->volume;
276 if (dev->mute)
277 s[1] |= 0x80;
278 return em28xx_write_ac97(dev, MASTER_AC97, s);
279 }
280
281
282 int em28xx_colorlevels_set_default(struct em28xx *dev)
283 {
284 em28xx_write_regs(dev, YGAIN_REG, "\x10", 1); /* contrast */
285 em28xx_write_regs(dev, YOFFSET_REG, "\x00", 1); /* brightness */
286 em28xx_write_regs(dev, UVGAIN_REG, "\x10", 1); /* saturation */
287 em28xx_write_regs(dev, UOFFSET_REG, "\x00", 1);
288 em28xx_write_regs(dev, VOFFSET_REG, "\x00", 1);
289 em28xx_write_regs(dev, SHARPNESS_REG, "\x00", 1);
290
291 em28xx_write_regs(dev, GAMMA_REG, "\x20", 1);
292 em28xx_write_regs(dev, RGAIN_REG, "\x20", 1);
293 em28xx_write_regs(dev, GGAIN_REG, "\x20", 1);
294 em28xx_write_regs(dev, BGAIN_REG, "\x20", 1);
295 em28xx_write_regs(dev, ROFFSET_REG, "\x00", 1);
296 em28xx_write_regs(dev, GOFFSET_REG, "\x00", 1);
297 return em28xx_write_regs(dev, BOFFSET_REG, "\x00", 1);
298 }
299
300 int em28xx_capture_start(struct em28xx *dev, int start)
301 {
302 int ret;
303 /* FIXME: which is the best order? */
304 /* video registers are sampled by VREF */
305 if ((ret = em28xx_write_reg_bits(dev, USBSUSP_REG, start ? 0x10 : 0x00,
306 0x10)) < 0)
307 return ret;
308 /* enable video capture */
309 return em28xx_write_regs(dev, VINENABLE_REG, start ? "\x67" : "\x27", 1);
310 }
311
312 int em28xx_outfmt_set_yuv422(struct em28xx *dev)
313 {
314 em28xx_write_regs(dev, OUTFMT_REG, "\x34", 1);
315 em28xx_write_regs(dev, VINMODE_REG, "\x10", 1);
316 return em28xx_write_regs(dev, VINCTRL_REG, "\x11", 1);
317 }
318
319 static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
320 u8 ymin, u8 ymax)
321 {
322 em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n", xmin, ymin, xmax, ymax);
323
324 em28xx_write_regs(dev, XMIN_REG, &xmin, 1);
325 em28xx_write_regs(dev, XMAX_REG, &xmax, 1);
326 em28xx_write_regs(dev, YMIN_REG, &ymin, 1);
327 return em28xx_write_regs(dev, YMAX_REG, &ymax, 1);
328 }
329
330 static int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
331 u16 width, u16 height)
332 {
333 u8 cwidth = width;
334 u8 cheight = height;
335 u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
336
337 em28xx_coredbg("em28xx Area Set: (%d,%d)\n", (width | (overflow & 2) << 7),
338 (height | (overflow & 1) << 8));
339
340 em28xx_write_regs(dev, HSTART_REG, &hstart, 1);
341 em28xx_write_regs(dev, VSTART_REG, &vstart, 1);
342 em28xx_write_regs(dev, CWIDTH_REG, &cwidth, 1);
343 em28xx_write_regs(dev, CHEIGHT_REG, &cheight, 1);
344 return em28xx_write_regs(dev, OFLOW_REG, &overflow, 1);
345 }
346
347 static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
348 {
349 u8 mode;
350 /* the em2800 scaler only supports scaling down to 50% */
351 if(dev->is_em2800)
352 mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
353 else {
354 u8 buf[2];
355 buf[0] = h;
356 buf[1] = h >> 8;
357 em28xx_write_regs(dev, HSCALELOW_REG, (char *)buf, 2);
358 buf[0] = v;
359 buf[1] = v >> 8;
360 em28xx_write_regs(dev, VSCALELOW_REG, (char *)buf, 2);
361 /* it seems that both H and V scalers must be active to work correctly */
362 mode = (h || v)? 0x30: 0x00;
363 }
364 return em28xx_write_reg_bits(dev, COMPR_REG, mode, 0x30);
365 }
366
367 /* FIXME: this only function read values from dev */
368 int em28xx_resolution_set(struct em28xx *dev)
369 {
370 int width, height;
371 width = norm_maxw(dev);
372 height = norm_maxh(dev) >> 1;
373
374 em28xx_outfmt_set_yuv422(dev);
375 em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
376 em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
377 return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
378 }
379
380
381 /******************* isoc transfer handling ****************************/
382
383 #ifdef ENABLE_DEBUG_ISOC_FRAMES
384 static void em28xx_isoc_dump(struct urb *urb)
385 {
386 int len = 0;
387 int ntrans = 0;
388 int i;
389
390 printk(KERN_DEBUG "isocIrq: sf=%d np=%d ec=%x\n",
391 urb->start_frame, urb->number_of_packets,
392 urb->error_count);
393 for (i = 0; i < urb->number_of_packets; i++) {
394 unsigned char *buf =
395 urb->transfer_buffer +
396 urb->iso_frame_desc[i].offset;
397 int alen = urb->iso_frame_desc[i].actual_length;
398 if (alen > 0) {
399 if (buf[0] == 0x88) {
400 ntrans++;
401 len += alen;
402 } else if (buf[0] == 0x22) {
403 printk(KERN_DEBUG
404 "= l=%d nt=%d bpp=%d\n",
405 len - 4 * ntrans, ntrans,
406 ntrans == 0 ? 0 : len / ntrans);
407 ntrans = 1;
408 len = alen;
409 } else
410 printk(KERN_DEBUG "!\n");
411 }
412 printk(KERN_DEBUG " n=%d s=%d al=%d %x\n", i,
413 urb->iso_frame_desc[i].status,
414 urb->iso_frame_desc[i].actual_length,
415 (unsigned int)
416 *((unsigned char *)(urb->transfer_buffer +
417 urb->iso_frame_desc[i].
418 offset)));
419 }
420 }
421 #endif
422
423 static inline int em28xx_isoc_video(struct em28xx *dev,struct em28xx_frame_t **f,
424 unsigned long *lock_flags, unsigned char buf)
425 {
426 if (!(buf & 0x01)) {
427 if ((*f)->state == F_GRABBING) {
428 /*previous frame is incomplete */
429 if ((*f)->fieldbytesused < dev->field_size) {
430 (*f)->state = F_ERROR;
431 em28xx_isocdbg ("dropping incomplete bottom field (%i missing bytes)",
432 dev->field_size-(*f)->fieldbytesused);
433 } else {
434 (*f)->state = F_DONE;
435 (*f)->buf.bytesused = dev->frame_size;
436 }
437 }
438 if ((*f)->state == F_DONE || (*f)->state == F_ERROR) {
439 /* move current frame to outqueue and get next free buffer from inqueue */
440 spin_lock_irqsave(&dev-> queue_lock, *lock_flags);
441 list_move_tail(&(*f)->frame, &dev->outqueue);
442 if (!list_empty(&dev->inqueue))
443 (*f) = list_entry(dev-> inqueue.next,
444 struct em28xx_frame_t,frame);
445 else
446 (*f) = NULL;
447 spin_unlock_irqrestore(&dev->queue_lock,*lock_flags);
448 }
449 if (!(*f)) {
450 em28xx_isocdbg ("new frame but no buffer is free");
451 return -1;
452 }
453 do_gettimeofday(&(*f)->buf.timestamp);
454 (*f)->buf.sequence = ++dev->frame_count;
455 (*f)->buf.field = V4L2_FIELD_INTERLACED;
456 (*f)->state = F_GRABBING;
457 (*f)->buf.bytesused = 0;
458 (*f)->top_field = 1;
459 (*f)->fieldbytesused = 0;
460 } else {
461 /* acquiring bottom field */
462 if ((*f)->state == F_GRABBING) {
463 if (!(*f)->top_field) {
464 (*f)->state = F_ERROR;
465 em28xx_isocdbg ("unexpected begin of bottom field; discarding it");
466 } else if ((*f)-> fieldbytesused < dev->field_size - 172) {
467 (*f)->state = F_ERROR;
468 em28xx_isocdbg ("dropping incomplete top field (%i missing bytes)",
469 dev->field_size-(*f)->fieldbytesused);
470 } else {
471 (*f)->top_field = 0;
472 (*f)->fieldbytesused = 0;
473 }
474 }
475 }
476 return (0);
477 }
478
479 static inline void em28xx_isoc_video_copy(struct em28xx *dev,
480 struct em28xx_frame_t **f, unsigned char *buf, int len)
481 {
482 void *fieldstart, *startwrite, *startread;
483 int linesdone, currlinedone, offset, lencopy,remain;
484
485 if(dev->frame_size != (*f)->buf.length){
486 em28xx_err("frame_size %i and buf.length %i are different!!!\n",dev->frame_size,(*f)->buf.length);
487 return;
488 }
489
490 if ((*f)->fieldbytesused + len > dev->field_size)
491 len =dev->field_size - (*f)->fieldbytesused;
492
493 if (buf[0] != 0x88 && buf[0] != 0x22) {
494 em28xx_isocdbg("frame is not complete\n");
495 startread = buf;
496 len+=4;
497 } else
498 startread = buf + 4;
499
500 remain = len;
501
502 if ((*f)->top_field)
503 fieldstart = (*f)->bufmem;
504 else
505 fieldstart = (*f)->bufmem + dev->bytesperline;
506
507 linesdone = (*f)->fieldbytesused / dev->bytesperline;
508 currlinedone = (*f)->fieldbytesused % dev->bytesperline;
509 offset = linesdone * dev->bytesperline * 2 + currlinedone;
510 startwrite = fieldstart + offset;
511 lencopy = dev->bytesperline - currlinedone;
512 lencopy = lencopy > remain ? remain : lencopy;
513
514 memcpy(startwrite, startread, lencopy);
515 remain -= lencopy;
516
517 while (remain > 0) {
518 startwrite += lencopy + dev->bytesperline;
519 startread += lencopy;
520 if (dev->bytesperline > remain)
521 lencopy = remain;
522 else
523 lencopy = dev->bytesperline;
524
525 memcpy(startwrite, startread, lencopy);
526 remain -= lencopy;
527 }
528
529 (*f)->fieldbytesused += len;
530 }
531
532 /*
533 * em28xx_isoIrq()
534 * handles the incoming isoc urbs and fills the frames from our inqueue
535 */
536 static void em28xx_isocIrq(struct urb *urb)
537 {
538 struct em28xx *dev = urb->context;
539 int i, status;
540 struct em28xx_frame_t **f;
541 unsigned long lock_flags;
542
543 if (!dev)
544 return;
545 #ifdef ENABLE_DEBUG_ISOC_FRAMES
546 if (isoc_debug>1)
547 em28xx_isoc_dump(urb);
548 #endif
549
550 if (urb->status == -ENOENT)
551 return;
552
553 f = &dev->frame_current;
554
555 if (dev->stream == STREAM_INTERRUPT) {
556 dev->stream = STREAM_OFF;
557 if ((*f))
558 (*f)->state = F_QUEUED;
559 em28xx_isocdbg("stream interrupted");
560 wake_up_interruptible(&dev->wait_stream);
561 }
562
563 if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
564 return;
565
566 if (dev->stream == STREAM_ON && !list_empty(&dev->inqueue)) {
567 if (!(*f))
568 (*f) = list_entry(dev->inqueue.next,
569 struct em28xx_frame_t, frame);
570
571 for (i = 0; i < urb->number_of_packets; i++) {
572 unsigned char *buf = urb->transfer_buffer +
573 urb->iso_frame_desc[i].offset;
574 int len = urb->iso_frame_desc[i].actual_length - 4;
575
576 if (urb->iso_frame_desc[i].status) {
577 em28xx_isocdbg("data error: [%d] len=%d, status=%d", i,
578 urb->iso_frame_desc[i].actual_length,
579 urb->iso_frame_desc[i].status);
580 if (urb->iso_frame_desc[i].status != -EPROTO)
581 continue;
582 }
583 if (urb->iso_frame_desc[i].actual_length <= 0) {
584 em28xx_isocdbg("packet %d is empty",i);
585 continue;
586 }
587 if (urb->iso_frame_desc[i].actual_length >
588 dev->max_pkt_size) {
589 em28xx_isocdbg("packet bigger than packet size");
590 continue;
591 }
592 /*new frame */
593 if (buf[0] == 0x22 && buf[1] == 0x5a) {
594 em28xx_isocdbg("Video frame, length=%i!",len);
595
596 if (em28xx_isoc_video(dev,f,&lock_flags,buf[2]))
597 break;
598 } else if (buf[0]==0x33 && buf[1]==0x95 && buf[2]==0x00) {
599 em28xx_isocdbg("VBI HEADER!!!");
600 }
601
602 /* actual copying */
603 if ((*f)->state == F_GRABBING) {
604 em28xx_isoc_video_copy(dev,f,buf, len);
605 }
606 }
607 }
608
609 for (i = 0; i < urb->number_of_packets; i++) {
610 urb->iso_frame_desc[i].status = 0;
611 urb->iso_frame_desc[i].actual_length = 0;
612 }
613
614 urb->status = 0;
615 if ((status = usb_submit_urb(urb, GFP_ATOMIC))) {
616 em28xx_errdev("resubmit of urb failed (error=%i)\n", status);
617 dev->state |= DEV_MISCONFIGURED;
618 }
619 wake_up_interruptible(&dev->wait_frame);
620 return;
621 }
622
623 /*
624 * em28xx_uninit_isoc()
625 * deallocates the buffers and urbs allocated during em28xx_init_iosc()
626 */
627 void em28xx_uninit_isoc(struct em28xx *dev)
628 {
629 int i;
630
631 for (i = 0; i < EM28XX_NUM_BUFS; i++) {
632 if (dev->urb[i]) {
633 usb_kill_urb(dev->urb[i]);
634 if (dev->transfer_buffer[i]){
635 usb_buffer_free(dev->udev,(EM28XX_NUM_PACKETS*dev->max_pkt_size),dev->transfer_buffer[i],dev->urb[i]->transfer_dma);
636 }
637 usb_free_urb(dev->urb[i]);
638 }
639 dev->urb[i] = NULL;
640 dev->transfer_buffer[i] = NULL;
641 }
642 em28xx_capture_start(dev, 0);
643 }
644
645 /*
646 * em28xx_init_isoc()
647 * allocates transfer buffers and submits the urbs for isoc transfer
648 */
649 int em28xx_init_isoc(struct em28xx *dev)
650 {
651 /* change interface to 3 which allowes the biggest packet sizes */
652 int i, errCode;
653 const int sb_size = EM28XX_NUM_PACKETS * dev->max_pkt_size;
654
655 /* reset streaming vars */
656 dev->frame_current = NULL;
657 dev->frame_count = 0;
658
659 /* allocate urbs */
660 for (i = 0; i < EM28XX_NUM_BUFS; i++) {
661 struct urb *urb;
662 int j, k;
663 /* allocate transfer buffer */
664 urb = usb_alloc_urb(EM28XX_NUM_PACKETS, GFP_KERNEL);
665 if (!urb){
666 em28xx_errdev("cannot alloc urb %i\n", i);
667 em28xx_uninit_isoc(dev);
668 return -ENOMEM;
669 }
670 dev->transfer_buffer[i] = usb_buffer_alloc(dev->udev, sb_size, GFP_KERNEL,&urb->transfer_dma);
671 if (!dev->transfer_buffer[i]) {
672 em28xx_errdev
673 ("unable to allocate %i bytes for transfer buffer %i\n",
674 sb_size, i);
675 em28xx_uninit_isoc(dev);
676 return -ENOMEM;
677 }
678 memset(dev->transfer_buffer[i], 0, sb_size);
679 urb->dev = dev->udev;
680 urb->context = dev;
681 urb->pipe = usb_rcvisocpipe(dev->udev, 0x82);
682 urb->transfer_flags = URB_ISO_ASAP;
683 urb->interval = 1;
684 urb->transfer_buffer = dev->transfer_buffer[i];
685 urb->complete = em28xx_isocIrq;
686 urb->number_of_packets = EM28XX_NUM_PACKETS;
687 urb->transfer_buffer_length = sb_size;
688 for (j = k = 0; j < EM28XX_NUM_PACKETS;
689 j++, k += dev->max_pkt_size) {
690 urb->iso_frame_desc[j].offset = k;
691 urb->iso_frame_desc[j].length =
692 dev->max_pkt_size;
693 }
694 dev->urb[i] = urb;
695 }
696
697 /* submit urbs */
698 for (i = 0; i < EM28XX_NUM_BUFS; i++) {
699 errCode = usb_submit_urb(dev->urb[i], GFP_KERNEL);
700 if (errCode) {
701 em28xx_errdev("submit of urb %i failed (error=%i)\n", i,
702 errCode);
703 em28xx_uninit_isoc(dev);
704 return errCode;
705 }
706 }
707
708 return 0;
709 }
710
711 int em28xx_set_alternate(struct em28xx *dev)
712 {
713 int errCode, prev_alt = dev->alt;
714 dev->alt = alt;
715 if (dev->alt == 0) {
716 int i;
717 for(i=0;i< dev->num_alt; i++)
718 if(dev->alt_max_pkt_size[i]>dev->alt_max_pkt_size[dev->alt])
719 dev->alt=i;
720 }
721
722 if (dev->alt != prev_alt) {
723 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
724 em28xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n", dev->alt,
725 dev->max_pkt_size);
726 errCode = usb_set_interface(dev->udev, 0, dev->alt);
727 if (errCode < 0) {
728 em28xx_errdev ("cannot change alternate number to %d (error=%i)\n",
729 dev->alt, errCode);
730 return errCode;
731 }
732 }
733 return 0;
734 }
Mirror for ia64_pv_ops.git