?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[PATCH] V4L: Makes needlessly global code static
[linux-2.6/sactl.git] / drivers / media / video / em28xx / em28xx-core.c
blob9f6e5e5355a11bb5b58dbfbea5f3801516533d84
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@brturbo.com.br>
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;
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;
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;
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 /* debug help functions */
68
69 static const char *v4l1_ioctls[] = {
70 "0", "CGAP", "GCHAN", "SCHAN", "GTUNER", "STUNER", "GPICT", "SPICT",
71 "CCAPTURE", "GWIN", "SWIN", "GFBUF", "SFBUF", "KEY", "GFREQ",
72 "SFREQ", "GAUDIO", "SAUDIO", "SYNC", "MCAPTURE", "GMBUF", "GUNIT",
73 "GCAPTURE", "SCAPTURE", "SPLAYMODE", "SWRITEMODE", "GPLAYINFO",
74 "SMICROCODE", "GVBIFMT", "SVBIFMT" };
75 #define V4L1_IOCTLS ARRAY_SIZE(v4l1_ioctls)
76
77 static const char *v4l2_ioctls[] = {
78 "QUERYCAP", "1", "ENUM_PIXFMT", "ENUM_FBUFFMT", "G_FMT", "S_FMT",
79 "G_COMP", "S_COMP", "REQBUFS", "QUERYBUF", "G_FBUF", "S_FBUF",
80 "G_WIN", "S_WIN", "PREVIEW", "QBUF", "16", "DQBUF", "STREAMON",
81 "STREAMOFF", "G_PERF", "G_PARM", "S_PARM", "G_STD", "S_STD",
82 "ENUMSTD", "ENUMINPUT", "G_CTRL", "S_CTRL", "G_TUNER", "S_TUNER",
83 "G_FREQ", "S_FREQ", "G_AUDIO", "S_AUDIO", "35", "QUERYCTRL",
84 "QUERYMENU", "G_INPUT", "S_INPUT", "ENUMCVT", "41", "42", "43",
85 "44", "45", "G_OUTPUT", "S_OUTPUT", "ENUMOUTPUT", "G_AUDOUT",
86 "S_AUDOUT", "ENUMFX", "G_EFFECT", "S_EFFECT", "G_MODULATOR",
87 "S_MODULATOR"
88 };
89 #define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)
90
91 void em28xx_print_ioctl(char *name, unsigned int cmd)
92 {
93 char *dir;
94
95 switch (_IOC_DIR(cmd)) {
96 case _IOC_NONE: dir = "--"; break;
97 case _IOC_READ: dir = "r-"; break;
98 case _IOC_WRITE: dir = "-w"; break;
99 case _IOC_READ | _IOC_WRITE: dir = "rw"; break;
100 default: dir = "??"; break;
101 }
102 switch (_IOC_TYPE(cmd)) {
103 case 'v':
104 printk(KERN_DEBUG "%s: ioctl 0x%08x (v4l1, %s, VIDIOC%s)\n",
105 name, cmd, dir, (_IOC_NR(cmd) < V4L1_IOCTLS) ?
106 v4l1_ioctls[_IOC_NR(cmd)] : "???");
107 break;
108 case 'V':
109 printk(KERN_DEBUG "%s: ioctl 0x%08x (v4l2, %s, VIDIOC_%s)\n",
110 name, cmd, dir, (_IOC_NR(cmd) < V4L2_IOCTLS) ?
111 v4l2_ioctls[_IOC_NR(cmd)] : "???");
112 break;
113 default:
114 printk(KERN_DEBUG "%s: ioctl 0x%08x (???, %s, #%d)\n",
115 name, cmd, dir, _IOC_NR(cmd));
116 }
117 }
118
119 static void *rvmalloc(size_t size)
120 {
121 void *mem;
122 unsigned long adr;
123
124 size = PAGE_ALIGN(size);
125
126 mem = vmalloc_32((unsigned long)size);
127 if (!mem)
128 return NULL;
129
130 memset(mem, 0, size);
131
132 adr = (unsigned long)mem;
133 while (size > 0) {
134 SetPageReserved(vmalloc_to_page((void *)adr));
135 adr += PAGE_SIZE;
136 size -= PAGE_SIZE;
137 }
138
139 return mem;
140 }
141
142 static void rvfree(void *mem, size_t size)
143 {
144 unsigned long adr;
145
146 if (!mem)
147 return;
148
149 size = PAGE_ALIGN(size);
150
151 adr = (unsigned long)mem;
152 while (size > 0) {
153 ClearPageReserved(vmalloc_to_page((void *)adr));
154 adr += PAGE_SIZE;
155 size -= PAGE_SIZE;
156 }
157
158 vfree(mem);
159 }
160
161 /*
162 * em28xx_request_buffers()
163 * allocate a number of buffers
164 */
165 u32 em28xx_request_buffers(struct em28xx *dev, u32 count)
166 {
167 const size_t imagesize = PAGE_ALIGN(dev->frame_size); /*needs to be page aligned cause the buffers can be mapped individually! */
168 void *buff = NULL;
169 u32 i;
170 em28xx_coredbg("requested %i buffers with size %i", count, imagesize);
171 if (count > EM28XX_NUM_FRAMES)
172 count = EM28XX_NUM_FRAMES;
173
174 dev->num_frames = count;
175 while (dev->num_frames > 0) {
176 if ((buff = rvmalloc(dev->num_frames * imagesize)))
177 break;
178 dev->num_frames--;
179 }
180
181 for (i = 0; i < dev->num_frames; i++) {
182 dev->frame[i].bufmem = buff + i * imagesize;
183 dev->frame[i].buf.index = i;
184 dev->frame[i].buf.m.offset = i * imagesize;
185 dev->frame[i].buf.length = dev->frame_size;
186 dev->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
187 dev->frame[i].buf.sequence = 0;
188 dev->frame[i].buf.field = V4L2_FIELD_NONE;
189 dev->frame[i].buf.memory = V4L2_MEMORY_MMAP;
190 dev->frame[i].buf.flags = 0;
191 }
192 return dev->num_frames;
193 }
194
195 /*
196 * em28xx_queue_unusedframes()
197 * add all frames that are not currently in use to the inbuffer queue
198 */
199 void em28xx_queue_unusedframes(struct em28xx *dev)
200 {
201 unsigned long lock_flags;
202 u32 i;
203
204 for (i = 0; i < dev->num_frames; i++)
205 if (dev->frame[i].state == F_UNUSED) {
206 dev->frame[i].state = F_QUEUED;
207 spin_lock_irqsave(&dev->queue_lock, lock_flags);
208 list_add_tail(&dev->frame[i].frame, &dev->inqueue);
209 spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
210 }
211 }
212
213 /*
214 * em28xx_release_buffers()
215 * free frame buffers
216 */
217 void em28xx_release_buffers(struct em28xx *dev)
218 {
219 if (dev->num_frames) {
220 rvfree(dev->frame[0].bufmem,
221 dev->num_frames * PAGE_ALIGN(dev->frame[0].buf.length));
222 dev->num_frames = 0;
223 }
224 }
225
226 /*
227 * em28xx_read_reg_req()
228 * reads data from the usb device specifying bRequest
229 */
230 int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
231 char *buf, int len)
232 {
233 int ret, byte;
234
235 em28xx_regdbg("req=%02x, reg=%02x ", req, reg);
236
237 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
238 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
239 0x0000, reg, buf, len, HZ);
240
241 if (reg_debug){
242 printk(ret < 0 ? " failed!\n" : "%02x values: ", ret);
243 for (byte = 0; byte < len; byte++) {
244 printk(" %02x", buf[byte]);
245 }
246 printk("\n");
247 }
248
249 return ret;
250 }
251
252 /*
253 * em28xx_read_reg_req()
254 * reads data from the usb device specifying bRequest
255 */
256 int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
257 {
258 u8 val;
259 int ret;
260
261 em28xx_regdbg("req=%02x, reg=%02x:", req, reg);
262
263 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
264 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
265 0x0000, reg, &val, 1, HZ);
266
267 if (reg_debug)
268 printk(ret < 0 ? " failed!\n" : "%02x\n", val);
269
270 if (ret < 0)
271 return ret;
272
273 return val;
274 }
275
276 int em28xx_read_reg(struct em28xx *dev, u16 reg)
277 {
278 return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
279 }
280
281 /*
282 * em28xx_write_regs_req()
283 * sends data to the usb device, specifying bRequest
284 */
285 int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
286 int len)
287 {
288 int ret;
289
290 /*usb_control_msg seems to expect a kmalloced buffer */
291 unsigned char *bufs = kmalloc(len, GFP_KERNEL);
292
293 em28xx_regdbg("req=%02x reg=%02x:", req, reg);
294
295 if (reg_debug) {
296 int i;
297 for (i = 0; i < len; ++i)
298 printk (" %02x", (unsigned char)buf[i]);
299 printk ("\n");
300 }
301
302 if (!bufs)
303 return -ENOMEM;
304 memcpy(bufs, buf, len);
305 ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), req,
306 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
307 0x0000, reg, bufs, len, HZ);
308 mdelay(5); /* FIXME: magic number */
309 kfree(bufs);
310 return ret;
311 }
312
313 int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
314 {
315 return em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
316 }
317
318 /*
319 * em28xx_write_reg_bits()
320 * sets only some bits (specified by bitmask) of a register, by first reading
321 * the actual value
322 */
323 int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
324 u8 bitmask)
325 {
326 int oldval;
327 u8 newval;
328 if ((oldval = em28xx_read_reg(dev, reg)) < 0)
329 return oldval;
330 newval = (((u8) oldval) & ~bitmask) | (val & bitmask);
331 return em28xx_write_regs(dev, reg, &newval, 1);
332 }
333
334 /*
335 * em28xx_write_ac97()
336 * write a 16 bit value to the specified AC97 address (LSB first!)
337 */
338 int em28xx_write_ac97(struct em28xx *dev, u8 reg, u8 * val)
339 {
340 int ret;
341 u8 addr = reg & 0x7f;
342 if ((ret = em28xx_write_regs(dev, AC97LSB_REG, val, 2)) < 0)
343 return ret;
344 if ((ret = em28xx_write_regs(dev, AC97ADDR_REG, &addr, 1)) < 0)
345 return ret;
346 if ((ret = em28xx_read_reg(dev, AC97BUSY_REG)) < 0)
347 return ret;
348 else if (((u8) ret) & 0x01) {
349 em28xx_warn ("AC97 command still being exectuted: not handled properly!\n");
350 }
351 return 0;
352 }
353
354 int em28xx_audio_analog_set(struct em28xx *dev)
355 {
356 char s[2] = { 0x00, 0x00 };
357 s[0] |= 0x1f - dev->volume;
358 s[1] |= 0x1f - dev->volume;
359 if (dev->mute)
360 s[1] |= 0x80;
361 return em28xx_write_ac97(dev, MASTER_AC97, s);
362 }
363
364
365 int em28xx_colorlevels_set_default(struct em28xx *dev)
366 {
367 em28xx_write_regs(dev, YGAIN_REG, "\x10", 1); /* contrast */
368 em28xx_write_regs(dev, YOFFSET_REG, "\x00", 1); /* brightness */
369 em28xx_write_regs(dev, UVGAIN_REG, "\x10", 1); /* saturation */
370 em28xx_write_regs(dev, UOFFSET_REG, "\x00", 1);
371 em28xx_write_regs(dev, VOFFSET_REG, "\x00", 1);
372 em28xx_write_regs(dev, SHARPNESS_REG, "\x00", 1);
373
374 em28xx_write_regs(dev, GAMMA_REG, "\x20", 1);
375 em28xx_write_regs(dev, RGAIN_REG, "\x20", 1);
376 em28xx_write_regs(dev, GGAIN_REG, "\x20", 1);
377 em28xx_write_regs(dev, BGAIN_REG, "\x20", 1);
378 em28xx_write_regs(dev, ROFFSET_REG, "\x00", 1);
379 em28xx_write_regs(dev, GOFFSET_REG, "\x00", 1);
380 return em28xx_write_regs(dev, BOFFSET_REG, "\x00", 1);
381 }
382
383 int em28xx_capture_start(struct em28xx *dev, int start)
384 {
385 int ret;
386 /* FIXME: which is the best order? */
387 /* video registers are sampled by VREF */
388 if ((ret = em28xx_write_reg_bits(dev, USBSUSP_REG, start ? 0x10 : 0x00,
389 0x10)) < 0)
390 return ret;
391 /* enable video capture */
392 return em28xx_write_regs(dev, VINENABLE_REG, start ? "\x67" : "\x27", 1);
393 }
394
395 int em28xx_outfmt_set_yuv422(struct em28xx *dev)
396 {
397 em28xx_write_regs(dev, OUTFMT_REG, "\x34", 1);
398 em28xx_write_regs(dev, VINMODE_REG, "\x10", 1);
399 return em28xx_write_regs(dev, VINCTRL_REG, "\x11", 1);
400 }
401
402 int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax, u8 ymin,
403 u8 ymax)
404 {
405 em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n", xmin, ymin, xmax, ymax);
406
407 em28xx_write_regs(dev, XMIN_REG, &xmin, 1);
408 em28xx_write_regs(dev, XMAX_REG, &xmax, 1);
409 em28xx_write_regs(dev, YMIN_REG, &ymin, 1);
410 return em28xx_write_regs(dev, YMAX_REG, &ymax, 1);
411 }
412
413 int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
414 u16 width, u16 height)
415 {
416 u8 cwidth = width;
417 u8 cheight = height;
418 u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
419
420 em28xx_coredbg("em28xx Area Set: (%d,%d)\n", (width | (overflow & 2) << 7),
421 (height | (overflow & 1) << 8));
422
423 em28xx_write_regs(dev, HSTART_REG, &hstart, 1);
424 em28xx_write_regs(dev, VSTART_REG, &vstart, 1);
425 em28xx_write_regs(dev, CWIDTH_REG, &cwidth, 1);
426 em28xx_write_regs(dev, CHEIGHT_REG, &cheight, 1);
427 return em28xx_write_regs(dev, OFLOW_REG, &overflow, 1);
428 }
429
430 int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
431 {
432 u8 mode;
433 /* the em2800 scaler only supports scaling down to 50% */
434 if(dev->is_em2800)
435 mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
436 else {
437 u8 buf[2];
438 buf[0] = h;
439 buf[1] = h >> 8;
440 em28xx_write_regs(dev, HSCALELOW_REG, (char *)buf, 2);
441 buf[0] = v;
442 buf[1] = v >> 8;
443 em28xx_write_regs(dev, VSCALELOW_REG, (char *)buf, 2);
444 /* it seems that both H and V scalers must be active to work correctly */
445 mode = (h || v)? 0x30: 0x00;
446 }
447 return em28xx_write_reg_bits(dev, COMPR_REG, mode, 0x30);
448 }
449
450 /* FIXME: this only function read values from dev */
451 int em28xx_resolution_set(struct em28xx *dev)
452 {
453 int width, height;
454 width = norm_maxw(dev);
455 height = norm_maxh(dev) >> 1;
456
457 em28xx_outfmt_set_yuv422(dev);
458 em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
459 em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
460 return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
461 }
462
463
464 /******************* isoc transfer handling ****************************/
465
466 #ifdef ENABLE_DEBUG_ISOC_FRAMES
467 static void em28xx_isoc_dump(struct urb *urb, struct pt_regs *regs)
468 {
469 int len = 0;
470 int ntrans = 0;
471 int i;
472
473 printk(KERN_DEBUG "isocIrq: sf=%d np=%d ec=%x\n",
474 urb->start_frame, urb->number_of_packets,
475 urb->error_count);
476 for (i = 0; i < urb->number_of_packets; i++) {
477 unsigned char *buf =
478 urb->transfer_buffer +
479 urb->iso_frame_desc[i].offset;
480 int alen = urb->iso_frame_desc[i].actual_length;
481 if (alen > 0) {
482 if (buf[0] == 0x88) {
483 ntrans++;
484 len += alen;
485 } else if (buf[0] == 0x22) {
486 printk(KERN_DEBUG
487 "= l=%d nt=%d bpp=%d\n",
488 len - 4 * ntrans, ntrans,
489 ntrans == 0 ? 0 : len / ntrans);
490 ntrans = 1;
491 len = alen;
492 } else
493 printk(KERN_DEBUG "!\n");
494 }
495 printk(KERN_DEBUG " n=%d s=%d al=%d %x\n", i,
496 urb->iso_frame_desc[i].status,
497 urb->iso_frame_desc[i].actual_length,
498 (unsigned int)
499 *((unsigned char *)(urb->transfer_buffer +
500 urb->iso_frame_desc[i].
501 offset)));
502 }
503 }
504 #endif
505
506 static inline int em28xx_isoc_video(struct em28xx *dev,struct em28xx_frame_t **f,
507 unsigned long *lock_flags, unsigned char buf)
508 {
509 if (!(buf & 0x01)) {
510 if ((*f)->state == F_GRABBING) {
511 /*previous frame is incomplete */
512 if ((*f)->fieldbytesused < dev->field_size) {
513 (*f)->state = F_ERROR;
514 em28xx_isocdbg ("dropping incomplete bottom field (%i missing bytes)",
515 dev->field_size-(*f)->fieldbytesused);
516 } else {
517 (*f)->state = F_DONE;
518 (*f)->buf.bytesused = dev->frame_size;
519 }
520 }
521 if ((*f)->state == F_DONE || (*f)->state == F_ERROR) {
522 /* move current frame to outqueue and get next free buffer from inqueue */
523 spin_lock_irqsave(&dev-> queue_lock, *lock_flags);
524 list_move_tail(&(*f)->frame, &dev->outqueue);
525 if (!list_empty(&dev->inqueue))
526 (*f) = list_entry(dev-> inqueue.next,
527 struct em28xx_frame_t,frame);
528 else
529 (*f) = NULL;
530 spin_unlock_irqrestore(&dev->queue_lock,*lock_flags);
531 }
532 if (!(*f)) {
533 em28xx_isocdbg ("new frame but no buffer is free");
534 return -1;
535 }
536 do_gettimeofday(&(*f)->buf.timestamp);
537 (*f)->buf.sequence = ++dev->frame_count;
538 (*f)->buf.field = V4L2_FIELD_INTERLACED;
539 (*f)->state = F_GRABBING;
540 (*f)->buf.bytesused = 0;
541 (*f)->top_field = 1;
542 (*f)->fieldbytesused = 0;
543 } else {
544 /* acquiring bottom field */
545 if ((*f)->state == F_GRABBING) {
546 if (!(*f)->top_field) {
547 (*f)->state = F_ERROR;
548 em28xx_isocdbg ("unexpected begin of bottom field; discarding it");
549 } else if ((*f)-> fieldbytesused < dev->field_size - 172) {
550 (*f)->state = F_ERROR;
551 em28xx_isocdbg ("dropping incomplete top field (%i missing bytes)",
552 dev->field_size-(*f)->fieldbytesused);
553 } else {
554 (*f)->top_field = 0;
555 (*f)->fieldbytesused = 0;
556 }
557 }
558 }
559 return (0);
560 }
561
562 static inline void em28xx_isoc_video_copy(struct em28xx *dev,
563 struct em28xx_frame_t **f, unsigned char *buf, int len)
564 {
565 void *fieldstart, *startwrite, *startread;
566 int linesdone, currlinedone, offset, lencopy,remain;
567
568 if(dev->frame_size != (*f)->buf.length){
569 em28xx_err("frame_size %i and buf.length %i are different!!!\n",dev->frame_size,(*f)->buf.length);
570 return;
571 }
572
573 if ((*f)->fieldbytesused + len > dev->field_size)
574 len =dev->field_size - (*f)->fieldbytesused;
575
576 if (buf[0] != 0x88 && buf[0] != 0x22) {
577 em28xx_isocdbg("frame is not complete\n");
578 startread = buf;
579 len+=4;
580 } else
581 startread = buf + 4;
582
583 remain = len;
584
585 if ((*f)->top_field)
586 fieldstart = (*f)->bufmem;
587 else
588 fieldstart = (*f)->bufmem + dev->bytesperline;
589
590 linesdone = (*f)->fieldbytesused / dev->bytesperline;
591 currlinedone = (*f)->fieldbytesused % dev->bytesperline;
592 offset = linesdone * dev->bytesperline * 2 + currlinedone;
593 startwrite = fieldstart + offset;
594 lencopy = dev->bytesperline - currlinedone;
595 lencopy = lencopy > remain ? remain : lencopy;
596
597 memcpy(startwrite, startread, lencopy);
598 remain -= lencopy;
599
600 while (remain > 0) {
601 startwrite += lencopy + dev->bytesperline;
602 startread += lencopy;
603 if (dev->bytesperline > remain)
604 lencopy = remain;
605 else
606 lencopy = dev->bytesperline;
607
608 memcpy(startwrite, startread, lencopy);
609 remain -= lencopy;
610 }
611
612 (*f)->fieldbytesused += len;
613 }
614
615 /*
616 * em28xx_isoIrq()
617 * handles the incoming isoc urbs and fills the frames from our inqueue
618 */
619 void em28xx_isocIrq(struct urb *urb, struct pt_regs *regs)
620 {
621 struct em28xx *dev = urb->context;
622 int i, status;
623 struct em28xx_frame_t **f;
624 unsigned long lock_flags;
625
626 if (!dev)
627 return;
628 #ifdef ENABLE_DEBUG_ISOC_FRAMES
629 if (isoc_debug>1)
630 em28xx_isoc_dump(urb, regs);
631 #endif
632
633 if (urb->status == -ENOENT)
634 return;
635
636 f = &dev->frame_current;
637
638 if (dev->stream == STREAM_INTERRUPT) {
639 dev->stream = STREAM_OFF;
640 if ((*f))
641 (*f)->state = F_QUEUED;
642 em28xx_isocdbg("stream interrupted");
643 wake_up_interruptible(&dev->wait_stream);
644 }
645
646 if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
647 return;
648
649 if (dev->stream == STREAM_ON && !list_empty(&dev->inqueue)) {
650 if (!(*f))
651 (*f) = list_entry(dev->inqueue.next,
652 struct em28xx_frame_t, frame);
653
654 for (i = 0; i < urb->number_of_packets; i++) {
655 unsigned char *buf = urb->transfer_buffer +
656 urb->iso_frame_desc[i].offset;
657 int len = urb->iso_frame_desc[i].actual_length - 4;
658
659 if (urb->iso_frame_desc[i].status) {
660 em28xx_isocdbg("data error: [%d] len=%d, status=%d", i,
661 urb->iso_frame_desc[i].actual_length,
662 urb->iso_frame_desc[i].status);
663 if (urb->iso_frame_desc[i].status != -EPROTO)
664 continue;
665 }
666 if (urb->iso_frame_desc[i].actual_length <= 0) {
667 em28xx_isocdbg("packet %d is empty",i);
668 continue;
669 }
670 if (urb->iso_frame_desc[i].actual_length >
671 dev->max_pkt_size) {
672 em28xx_isocdbg("packet bigger than packet size");
673 continue;
674 }
675 /*new frame */
676 if (buf[0] == 0x22 && buf[1] == 0x5a) {
677 em28xx_isocdbg("Video frame, length=%i!",len);
678
679 if (em28xx_isoc_video(dev,f,&lock_flags,buf[2]))
680 break;
681 } else if (buf[0]==0x33 && buf[1]==0x95 && buf[2]==0x00) {
682 em28xx_isocdbg("VBI HEADER!!!");
683 }
684
685 /* actual copying */
686 if ((*f)->state == F_GRABBING) {
687 em28xx_isoc_video_copy(dev,f,buf, len);
688 }
689 }
690 }
691
692 for (i = 0; i < urb->number_of_packets; i++) {
693 urb->iso_frame_desc[i].status = 0;
694 urb->iso_frame_desc[i].actual_length = 0;
695 }
696
697 urb->status = 0;
698 if ((status = usb_submit_urb(urb, GFP_ATOMIC))) {
699 em28xx_errdev("resubmit of urb failed (error=%i)\n", status);
700 dev->state |= DEV_MISCONFIGURED;
701 }
702 wake_up_interruptible(&dev->wait_frame);
703 return;
704 }
705
706 /*
707 * em28xx_uninit_isoc()
708 * deallocates the buffers and urbs allocated during em28xx_init_iosc()
709 */
710 void em28xx_uninit_isoc(struct em28xx *dev)
711 {
712 int i;
713
714 for (i = 0; i < EM28XX_NUM_BUFS; i++) {
715 if (dev->urb[i]) {
716 usb_kill_urb(dev->urb[i]);
717 if (dev->transfer_buffer[i]){
718 usb_buffer_free(dev->udev,(EM28XX_NUM_PACKETS*dev->max_pkt_size),dev->transfer_buffer[i],dev->urb[i]->transfer_dma);
719 }
720 usb_free_urb(dev->urb[i]);
721 }
722 dev->urb[i] = NULL;
723 dev->transfer_buffer[i] = NULL;
724 }
725 em28xx_capture_start(dev, 0);
726 }
727
728 /*
729 * em28xx_init_isoc()
730 * allocates transfer buffers and submits the urbs for isoc transfer
731 */
732 int em28xx_init_isoc(struct em28xx *dev)
733 {
734 /* change interface to 3 which allowes the biggest packet sizes */
735 int i, errCode;
736 const int sb_size = EM28XX_NUM_PACKETS * dev->max_pkt_size;
737
738 /* reset streaming vars */
739 dev->frame_current = NULL;
740 dev->frame_count = 0;
741
742 /* allocate urbs */
743 for (i = 0; i < EM28XX_NUM_BUFS; i++) {
744 struct urb *urb;
745 int j, k;
746 /* allocate transfer buffer */
747 urb = usb_alloc_urb(EM28XX_NUM_PACKETS, GFP_KERNEL);
748 if (!urb){
749 em28xx_errdev("cannot alloc urb %i\n", i);
750 em28xx_uninit_isoc(dev);
751 return -ENOMEM;
752 }
753 dev->transfer_buffer[i] = usb_buffer_alloc(dev->udev, sb_size, GFP_KERNEL,&urb->transfer_dma);
754 if (!dev->transfer_buffer[i]) {
755 em28xx_errdev
756 ("unable to allocate %i bytes for transfer buffer %i\n",
757 sb_size, i);
758 em28xx_uninit_isoc(dev);
759 return -ENOMEM;
760 }
761 memset(dev->transfer_buffer[i], 0, sb_size);
762 urb->dev = dev->udev;
763 urb->context = dev;
764 urb->pipe = usb_rcvisocpipe(dev->udev, 0x82);
765 urb->transfer_flags = URB_ISO_ASAP;
766 urb->interval = 1;
767 urb->transfer_buffer = dev->transfer_buffer[i];
768 urb->complete = em28xx_isocIrq;
769 urb->number_of_packets = EM28XX_NUM_PACKETS;
770 urb->transfer_buffer_length = sb_size;
771 for (j = k = 0; j < EM28XX_NUM_PACKETS;
772 j++, k += dev->max_pkt_size) {
773 urb->iso_frame_desc[j].offset = k;
774 urb->iso_frame_desc[j].length =
775 dev->max_pkt_size;
776 }
777 dev->urb[i] = urb;
778 }
779
780 /* submit urbs */
781 for (i = 0; i < EM28XX_NUM_BUFS; i++) {
782 errCode = usb_submit_urb(dev->urb[i], GFP_KERNEL);
783 if (errCode) {
784 em28xx_errdev("submit of urb %i failed (error=%i)\n", i,
785 errCode);
786 em28xx_uninit_isoc(dev);
787 return errCode;
788 }
789 }
790
791 return 0;
792 }
793
794 int em28xx_set_alternate(struct em28xx *dev)
795 {
796 int errCode, prev_alt = dev->alt;
797 dev->alt = alt;
798 if (dev->alt == 0) {
799 int i;
800 for(i=0;i< dev->num_alt; i++)
801 if(dev->alt_max_pkt_size[i]>dev->alt_max_pkt_size[dev->alt])
802 dev->alt=i;
803 }
804
805 if (dev->alt != prev_alt) {
806 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
807 em28xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n", dev->alt,
808 dev->max_pkt_size);
809 errCode = usb_set_interface(dev->udev, 0, dev->alt);
810 if (errCode < 0) {
811 em28xx_errdev ("cannot change alternate number to %d (error=%i)\n",
812 dev->alt, errCode);
813 return errCode;
814 }
815 }
816 return 0;
817 }
SocketAccessConTroL development