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[PATCH] v4l: 784: several improvement on i2c ir handling for em2820
[mirror_ubuntu-zesty-kernel.git] / drivers / media / video / em28xx / em28xx-core.c
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a6c2ba28 1/*
596d92d5 2 em2820-core.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
a6c2ba28 3
4 Copyright (C) 2005 Markus Rechberger <mrechberger@gmail.com>
5 Ludovico Cavedon <cavedon@sssup.it>
6 Mauro Carvalho Chehab <mchehab@brturbo.com.br>
7
8 Based on the em2800 driver from Sascha Sommer <saschasommer@freenet.de>
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
25#include <linux/init.h>
26#include <linux/list.h>
27#include <linux/module.h>
28#include <linux/moduleparam.h>
a6c2ba28 29#include <linux/usb.h>
30#include <linux/vmalloc.h>
31
32#include "em2820.h"
33
34/* #define ENABLE_DEBUG_ISOC_FRAMES */
35
36unsigned int core_debug = 0;
37module_param(core_debug,int,0644);
38MODULE_PARM_DESC(core_debug,"enable debug messages [core]");
39
40#define em2820_coredbg(fmt, arg...) do {\
41 if (core_debug) \
42 printk(KERN_INFO "%s %s :"fmt, \
43 dev->name, __FUNCTION__ , ##arg); } while (0)
44
45unsigned int reg_debug = 0;
46module_param(reg_debug,int,0644);
47MODULE_PARM_DESC(reg_debug,"enable debug messages [URB reg]");
48
49#define em2820_regdbg(fmt, arg...) do {\
50 if (reg_debug) \
51 printk(KERN_INFO "%s %s :"fmt, \
52 dev->name, __FUNCTION__ , ##arg); } while (0)
53
54unsigned int isoc_debug = 0;
55module_param(isoc_debug,int,0644);
55b8b2d1 56MODULE_PARM_DESC(isoc_debug,"enable debug messages [isoc transfers]");
a6c2ba28 57
58#define em2820_isocdbg(fmt, arg...) do {\
59 if (isoc_debug) \
60 printk(KERN_INFO "%s %s :"fmt, \
61 dev->name, __FUNCTION__ , ##arg); } while (0)
62
63static int alt = EM2820_PINOUT;
64module_param(alt, int, 0644);
65MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
66
67/* ------------------------------------------------------------------ */
68/* debug help functions */
69
70static const char *v4l1_ioctls[] = {
71 "0", "CGAP", "GCHAN", "SCHAN", "GTUNER", "STUNER", "GPICT", "SPICT",
72 "CCAPTURE", "GWIN", "SWIN", "GFBUF", "SFBUF", "KEY", "GFREQ",
73 "SFREQ", "GAUDIO", "SAUDIO", "SYNC", "MCAPTURE", "GMBUF", "GUNIT",
74 "GCAPTURE", "SCAPTURE", "SPLAYMODE", "SWRITEMODE", "GPLAYINFO",
75 "SMICROCODE", "GVBIFMT", "SVBIFMT" };
76#define V4L1_IOCTLS ARRAY_SIZE(v4l1_ioctls)
77
78static const char *v4l2_ioctls[] = {
79 "QUERYCAP", "1", "ENUM_PIXFMT", "ENUM_FBUFFMT", "G_FMT", "S_FMT",
80 "G_COMP", "S_COMP", "REQBUFS", "QUERYBUF", "G_FBUF", "S_FBUF",
81 "G_WIN", "S_WIN", "PREVIEW", "QBUF", "16", "DQBUF", "STREAMON",
82 "STREAMOFF", "G_PERF", "G_PARM", "S_PARM", "G_STD", "S_STD",
83 "ENUMSTD", "ENUMINPUT", "G_CTRL", "S_CTRL", "G_TUNER", "S_TUNER",
84 "G_FREQ", "S_FREQ", "G_AUDIO", "S_AUDIO", "35", "QUERYCTRL",
85 "QUERYMENU", "G_INPUT", "S_INPUT", "ENUMCVT", "41", "42", "43",
86 "44", "45", "G_OUTPUT", "S_OUTPUT", "ENUMOUTPUT", "G_AUDOUT",
87 "S_AUDOUT", "ENUMFX", "G_EFFECT", "S_EFFECT", "G_MODULATOR",
88 "S_MODULATOR"
89};
90#define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)
91
92void em2820_print_ioctl(char *name, unsigned int cmd)
93{
94 char *dir;
95
96 switch (_IOC_DIR(cmd)) {
97 case _IOC_NONE: dir = "--"; break;
98 case _IOC_READ: dir = "r-"; break;
99 case _IOC_WRITE: dir = "-w"; break;
100 case _IOC_READ | _IOC_WRITE: dir = "rw"; break;
101 default: dir = "??"; break;
102 }
103 switch (_IOC_TYPE(cmd)) {
104 case 'v':
105 printk(KERN_DEBUG "%s: ioctl 0x%08x (v4l1, %s, VIDIOC%s)\n",
106 name, cmd, dir, (_IOC_NR(cmd) < V4L1_IOCTLS) ?
107 v4l1_ioctls[_IOC_NR(cmd)] : "???");
108 break;
109 case 'V':
110 printk(KERN_DEBUG "%s: ioctl 0x%08x (v4l2, %s, VIDIOC_%s)\n",
111 name, cmd, dir, (_IOC_NR(cmd) < V4L2_IOCTLS) ?
112 v4l2_ioctls[_IOC_NR(cmd)] : "???");
113 break;
114 default:
115 printk(KERN_DEBUG "%s: ioctl 0x%08x (???, %s, #%d)\n",
116 name, cmd, dir, _IOC_NR(cmd));
117 }
118}
119
120static void *rvmalloc(size_t size)
121{
122 void *mem;
123 unsigned long adr;
124
125 size = PAGE_ALIGN(size);
126
127 mem = vmalloc_32((unsigned long)size);
128 if (!mem)
129 return NULL;
130
131 memset(mem, 0, size);
132
133 adr = (unsigned long)mem;
134 while (size > 0) {
135 SetPageReserved(vmalloc_to_page((void *)adr));
136 adr += PAGE_SIZE;
137 size -= PAGE_SIZE;
138 }
139
140 return mem;
141}
142
143static void rvfree(void *mem, size_t size)
144{
145 unsigned long adr;
146
147 if (!mem)
148 return;
149
150 size = PAGE_ALIGN(size);
151
152 adr = (unsigned long)mem;
153 while (size > 0) {
154 ClearPageReserved(vmalloc_to_page((void *)adr));
155 adr += PAGE_SIZE;
156 size -= PAGE_SIZE;
157 }
158
159 vfree(mem);
160}
161
162/*
163 * em2820_request_buffers()
164 * allocate a number of buffers
165 */
166u32 em2820_request_buffers(struct em2820 *dev, u32 count)
167{
168 const size_t imagesize = PAGE_ALIGN(dev->frame_size); /*needs to be page aligned cause the buffers can be mapped individually! */
169 void *buff = NULL;
170 u32 i;
171 em2820_coredbg("requested %i buffers with size %i", count, imagesize);
172 if (count > EM2820_NUM_FRAMES)
173 count = EM2820_NUM_FRAMES;
174
175 dev->num_frames = count;
176 while (dev->num_frames > 0) {
177 if ((buff = rvmalloc(dev->num_frames * imagesize)))
178 break;
179 dev->num_frames--;
180 }
181
182 for (i = 0; i < dev->num_frames; i++) {
183 dev->frame[i].bufmem = buff + i * imagesize;
184 dev->frame[i].buf.index = i;
185 dev->frame[i].buf.m.offset = i * imagesize;
186 dev->frame[i].buf.length = dev->frame_size;
187 dev->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
188 dev->frame[i].buf.sequence = 0;
189 dev->frame[i].buf.field = V4L2_FIELD_NONE;
190 dev->frame[i].buf.memory = V4L2_MEMORY_MMAP;
191 dev->frame[i].buf.flags = 0;
192 }
193 return dev->num_frames;
194}
195
196/*
197 * em2820_queue_unusedframes()
198 * add all frames that are not currently in use to the inbuffer queue
199 */
200void em2820_queue_unusedframes(struct em2820 *dev)
201{
202 unsigned long lock_flags;
203 u32 i;
204
205 for (i = 0; i < dev->num_frames; i++)
206 if (dev->frame[i].state == F_UNUSED) {
207 dev->frame[i].state = F_QUEUED;
208 spin_lock_irqsave(&dev->queue_lock, lock_flags);
209 list_add_tail(&dev->frame[i].frame, &dev->inqueue);
210 spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
211 }
212}
213
214/*
215 * em2820_release_buffers()
216 * free frame buffers
217 */
218void em2820_release_buffers(struct em2820 *dev)
219{
220 if (dev->num_frames) {
221 rvfree(dev->frame[0].bufmem,
222 dev->num_frames * PAGE_ALIGN(dev->frame[0].buf.length));
223 dev->num_frames = 0;
224 }
225}
226
227/*
228 * em2820_read_reg_req()
229 * reads data from the usb device specifying bRequest
230 */
231int em2820_read_reg_req_len(struct em2820 *dev, u8 req, u16 reg,
232 char *buf, int len)
233{
234 int ret, byte;
235
236 em2820_regdbg("req=%02x, reg=%02x ", req, reg);
237
238 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
239 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
240 0x0000, reg, buf, len, HZ);
241
242 if (reg_debug){
243 printk(ret < 0 ? " failed!\n" : "%02x values: ", ret);
244 for (byte = 0; byte < len; byte++) {
245 printk(" %02x", buf[byte]);
246 }
247 printk("\n");
248 }
249
250 return ret;
251}
252
253/*
254 * em2820_read_reg_req()
255 * reads data from the usb device specifying bRequest
256 */
257int em2820_read_reg_req(struct em2820 *dev, u8 req, u16 reg)
258{
259 u8 val;
260 int ret;
261
262 em2820_regdbg("req=%02x, reg=%02x:", req, reg);
263
264 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
265 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
266 0x0000, reg, &val, 1, HZ);
267
268 if (reg_debug)
269 printk(ret < 0 ? " failed!\n" : "%02x\n", val);
270
271 if (ret < 0)
272 return ret;
273
274 return val;
275}
276
277int em2820_read_reg(struct em2820 *dev, u16 reg)
278{
279 return em2820_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
280}
281
282/*
283 * em2820_write_regs_req()
284 * sends data to the usb device, specifying bRequest
285 */
286int em2820_write_regs_req(struct em2820 *dev, u8 req, u16 reg, char *buf,
287 int len)
288{
289 int ret;
290
291 /*usb_control_msg seems to expect a kmalloced buffer */
292 unsigned char *bufs = kmalloc(len, GFP_KERNEL);
293
294 em2820_regdbg("req=%02x reg=%02x:", req, reg);
295
296 if (reg_debug) {
297 int i;
298 for (i = 0; i < len; ++i)
299 printk (" %02x", (unsigned char)buf[i]);
300 printk ("\n");
301 }
302
303 if (!bufs)
304 return -ENOMEM;
305 memcpy(bufs, buf, len);
306 ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), req,
307 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
308 0x0000, reg, bufs, len, HZ);
309 mdelay(5); /* FIXME: magic number */
310 kfree(bufs);
311 return ret;
312}
313
314int em2820_write_regs(struct em2820 *dev, u16 reg, char *buf, int len)
315{
316 return em2820_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
317}
318
319/*
320 * em2820_write_reg_bits()
321 * sets only some bits (specified by bitmask) of a register, by first reading
322 * the actual value
323 */
324int em2820_write_reg_bits(struct em2820 *dev, u16 reg, u8 val,
325 u8 bitmask)
326{
327 int oldval;
328 u8 newval;
329 if ((oldval = em2820_read_reg(dev, reg)) < 0)
330 return oldval;
331 newval = (((u8) oldval) & ~bitmask) | (val & bitmask);
332 return em2820_write_regs(dev, reg, &newval, 1);
333}
334
335/*
336 * em2820_write_ac97()
337 * write a 16 bit value to the specified AC97 address (LSB first!)
338 */
339int em2820_write_ac97(struct em2820 *dev, u8 reg, u8 * val)
340{
341 int ret;
342 u8 addr = reg & 0x7f;
343 if ((ret = em2820_write_regs(dev, AC97LSB_REG, val, 2)) < 0)
344 return ret;
345 if ((ret = em2820_write_regs(dev, AC97ADDR_REG, &addr, 1)) < 0)
346 return ret;
347 if ((ret = em2820_read_reg(dev, AC97BUSY_REG)) < 0)
348 return ret;
349 else if (((u8) ret) & 0x01) {
350 em2820_warn ("AC97 command still being exectuted: not handled properly!\n");
351 }
352 return 0;
353}
354
355int em2820_audio_analog_set(struct em2820 *dev)
356{
357 char s[2] = { 0x00, 0x00 };
358 s[0] |= 0x1f - dev->volume;
359 s[1] |= 0x1f - dev->volume;
360 if (dev->mute)
361 s[1] |= 0x80;
362 return em2820_write_ac97(dev, MASTER_AC97, s);
363}
364
365
366int em2820_colorlevels_set_default(struct em2820 *dev)
367{
368 em2820_write_regs(dev, YGAIN_REG, "\x10", 1); /* contrast */
369 em2820_write_regs(dev, YOFFSET_REG, "\x00", 1); /* brightness */
370 em2820_write_regs(dev, UVGAIN_REG, "\x10", 1); /* saturation */
371 em2820_write_regs(dev, UOFFSET_REG, "\x00", 1);
372 em2820_write_regs(dev, VOFFSET_REG, "\x00", 1);
373 em2820_write_regs(dev, SHARPNESS_REG, "\x00", 1);
374
375 em2820_write_regs(dev, GAMMA_REG, "\x20", 1);
376 em2820_write_regs(dev, RGAIN_REG, "\x20", 1);
377 em2820_write_regs(dev, GGAIN_REG, "\x20", 1);
378 em2820_write_regs(dev, BGAIN_REG, "\x20", 1);
379 em2820_write_regs(dev, ROFFSET_REG, "\x00", 1);
380 em2820_write_regs(dev, GOFFSET_REG, "\x00", 1);
381 return em2820_write_regs(dev, BOFFSET_REG, "\x00", 1);
382}
383
384int em2820_capture_start(struct em2820 *dev, int start)
385{
386 int ret;
387 /* FIXME: which is the best order? */
388 /* video registers are sampled by VREF */
389 if ((ret = em2820_write_reg_bits(dev, USBSUSP_REG, start ? 0x10 : 0x00,
390 0x10)) < 0)
391 return ret;
392 /* enable video capture */
393 return em2820_write_regs(dev, VINENABLE_REG, start ? "\x67" : "\x27", 1);
394}
395
396int em2820_outfmt_set_yuv422(struct em2820 *dev)
397{
398 em2820_write_regs(dev, OUTFMT_REG, "\x34", 1);
399 em2820_write_regs(dev, VINMODE_REG, "\x10", 1);
400 return em2820_write_regs(dev, VINCTRL_REG, "\x11", 1);
401}
402
403int em2820_accumulator_set(struct em2820 *dev, u8 xmin, u8 xmax, u8 ymin,
404 u8 ymax)
405{
406 em2820_coredbg("em2820 Scale: (%d,%d)-(%d,%d)\n", xmin, ymin, xmax, ymax);
407
408 em2820_write_regs(dev, XMIN_REG, &xmin, 1);
409 em2820_write_regs(dev, XMAX_REG, &xmax, 1);
410 em2820_write_regs(dev, YMIN_REG, &ymin, 1);
411 return em2820_write_regs(dev, YMAX_REG, &ymax, 1);
412}
413
414int em2820_capture_area_set(struct em2820 *dev, u8 hstart, u8 vstart,
415 u16 width, u16 height)
416{
417 u8 cwidth = width;
418 u8 cheight = height;
419 u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
420
421 em2820_coredbg("em2820 Area Set: (%d,%d)\n", (width | (overflow & 2) << 7),
422 (height | (overflow & 1) << 8));
423
424 em2820_write_regs(dev, HSTART_REG, &hstart, 1);
425 em2820_write_regs(dev, VSTART_REG, &vstart, 1);
426 em2820_write_regs(dev, CWIDTH_REG, &cwidth, 1);
427 em2820_write_regs(dev, CHEIGHT_REG, &cheight, 1);
428 return em2820_write_regs(dev, OFLOW_REG, &overflow, 1);
429}
430
431int em2820_scaler_set(struct em2820 *dev, u16 h, u16 v)
432{
433 u8 buf[2];
434 buf[0] = h;
435 buf[1] = h >> 8;
436 em2820_write_regs(dev, HSCALELOW_REG, (char *)buf, 2);
437 buf[0] = v;
438 buf[1] = v >> 8;
439 em2820_write_regs(dev, VSCALELOW_REG, (char *)buf, 2);
440 /* when H and V mixershould be used? */
441 /* return em2820_write_reg_bits(dev, COMPR_REG, (h ? 0x20 : 0x00) | (v ? 0x10 : 0x00), 0x30); */
442 /* it seems that both H and V scalers must be active to work correctly */
443 return em2820_write_reg_bits(dev, COMPR_REG, h
444 || v ? 0x30 : 0x00, 0x30);
445}
446
447/* FIXME: this only function read values from dev */
448int em2820_resolution_set(struct em2820 *dev)
449{
450 int width, height;
451 width = norm_maxw(dev);
452 height = norm_maxh(dev) >> 1;
453
454 em2820_outfmt_set_yuv422(dev);
455 em2820_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
456 em2820_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
457 return em2820_scaler_set(dev, dev->hscale, dev->vscale);
458}
459
460
461/******************* isoc transfer handling ****************************/
462
463#ifdef ENABLE_DEBUG_ISOC_FRAMES
464static void em2820_isoc_dump(struct urb *urb, struct pt_regs *regs)
465{
466 int len = 0;
467 int ntrans = 0;
468 int i;
469
470 printk(KERN_DEBUG "isocIrq: sf=%d np=%d ec=%x\n",
471 urb->start_frame, urb->number_of_packets,
472 urb->error_count);
473 for (i = 0; i < urb->number_of_packets; i++) {
474 unsigned char *buf =
475 urb->transfer_buffer +
476 urb->iso_frame_desc[i].offset;
477 int alen = urb->iso_frame_desc[i].actual_length;
478 if (alen > 0) {
479 if (buf[0] == 0x88) {
480 ntrans++;
481 len += alen;
482 } else if (buf[0] == 0x22) {
483 printk(KERN_DEBUG
484 "= l=%d nt=%d bpp=%d\n",
485 len - 4 * ntrans, ntrans,
486 ntrans == 0 ? 0 : len / ntrans);
487 ntrans = 1;
488 len = alen;
489 } else
490 printk(KERN_DEBUG "!\n");
491 }
492 printk(KERN_DEBUG " n=%d s=%d al=%d %x\n", i,
493 urb->iso_frame_desc[i].status,
494 urb->iso_frame_desc[i].actual_length,
495 (unsigned int)
496 *((unsigned char *)(urb->transfer_buffer +
497 urb->iso_frame_desc[i].
498 offset)));
499 }
500}
501#endif
502
503static inline int em2820_isoc_video(struct em2820 *dev,struct em2820_frame_t **f,
504 unsigned long *lock_flags, unsigned char buf)
505{
506 if (!(buf & 0x01)) {
507 if ((*f)->state == F_GRABBING) {
508 /*previous frame is incomplete */
509 if ((*f)->fieldbytesused < dev->field_size) {
510 (*f)->state = F_ERROR;
511 em2820_isocdbg ("dropping incomplete bottom field (%i missing bytes)",
512 dev->field_size-(*f)->fieldbytesused);
513 } else {
514 (*f)->state = F_DONE;
515 (*f)->buf.bytesused = dev->frame_size;
516 }
517 }
518 if ((*f)->state == F_DONE || (*f)->state == F_ERROR) {
519 /* move current frame to outqueue and get next free buffer from inqueue */
520 spin_lock_irqsave(&dev-> queue_lock, *lock_flags);
521 list_move_tail(&(*f)->frame, &dev->outqueue);
522 if (!list_empty(&dev->inqueue))
523 (*f) = list_entry(dev-> inqueue.next,
524 struct em2820_frame_t,frame);
525 else
526 (*f) = NULL;
527 spin_unlock_irqrestore(&dev->queue_lock,*lock_flags);
528 }
529 if (!(*f)) {
530 em2820_isocdbg ("new frame but no buffer is free");
531 return -1;
532 }
533 do_gettimeofday(&(*f)->buf.timestamp);
534 (*f)->buf.sequence = ++dev->frame_count;
535 (*f)->buf.field = V4L2_FIELD_INTERLACED;
536 (*f)->state = F_GRABBING;
537 (*f)->buf.bytesused = 0;
538 (*f)->top_field = 1;
539 (*f)->fieldbytesused = 0;
540 } else {
541 /* acquiring bottom field */
542 if ((*f)->state == F_GRABBING) {
543 if (!(*f)->top_field) {
544 (*f)->state = F_ERROR;
545 em2820_isocdbg ("unexpected begin of bottom field; discarding it");
546 } else if ((*f)-> fieldbytesused < dev->field_size - 172) {
547 (*f)->state = F_ERROR;
548 em2820_isocdbg ("dropping incomplete top field (%i missing bytes)",
549 dev->field_size-(*f)->fieldbytesused);
550 } else {
551 (*f)->top_field = 0;
552 (*f)->fieldbytesused = 0;
553 }
554 }
555 }
556 return (0);
557}
558
559static inline void em2820_isoc_video_copy(struct em2820 *dev,
560 struct em2820_frame_t **f, unsigned char *buf, int len)
561{
562 void *fieldstart, *startwrite, *startread;
563 int linesdone, currlinedone, offset, lencopy,remain;
564
596d92d5
MCC		 565 if(dev->frame_size != (*f)->buf.length){
566 em2820_err("frame_size %i and buf.length %i are different!!!\n",dev->frame_size,(*f)->buf.length);
567 return;
568 }
569
a6c2ba28 570 if ((*f)->fieldbytesused + len > dev->field_size)
571 len =dev->field_size - (*f)->fieldbytesused;
572 remain = len;
573 startread = buf + 4;
574 if ((*f)->top_field)
575 fieldstart = (*f)->bufmem;
576 else
577 fieldstart = (*f)->bufmem + dev->bytesperline;
578
579 linesdone = (*f)->fieldbytesused / dev->bytesperline;
580 currlinedone = (*f)->fieldbytesused % dev->bytesperline;
581 offset = linesdone * dev->bytesperline * 2 + currlinedone;
582 startwrite = fieldstart + offset;
583 lencopy = dev->bytesperline - currlinedone;
584 lencopy = lencopy > remain ? remain : lencopy;
585
586 memcpy(startwrite, startread, lencopy);
587 remain -= lencopy;
588
589 while (remain > 0) {
590 startwrite += lencopy + dev->bytesperline;
591 startread += lencopy;
592 if (dev->bytesperline > remain)
593 lencopy = remain;
594 else
595 lencopy = dev->bytesperline;
596
597 memcpy(startwrite, startread, lencopy);
598 remain -= lencopy;
599 }
600
601 (*f)->fieldbytesused += len;
602}
603
604/*
605 * em2820_isoIrq()
606 * handles the incoming isoc urbs and fills the frames from our inqueue
607 */
608void em2820_isocIrq(struct urb *urb, struct pt_regs *regs)
609{
610 struct em2820 *dev = urb->context;
611 int i, status;
612 struct em2820_frame_t **f;
613 unsigned long lock_flags;
614
615 if (!dev)
616 return;
617#ifdef ENABLE_DEBUG_ISOC_FRAMES
618 if (isoc_debug>1)
619 em2820_isoc_dump(urb, regs);
620#endif
621
622 if (urb->status == -ENOENT)
623 return;
624
625 f = &dev->frame_current;
626
627 if (dev->stream == STREAM_INTERRUPT) {
628 dev->stream = STREAM_OFF;
629 if ((*f))
630 (*f)->state = F_QUEUED;
631 em2820_isocdbg("stream interrupted");
632 wake_up_interruptible(&dev->wait_stream);
633 }
634
635 if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
636 return;
637
638 if (dev->stream == STREAM_ON && !list_empty(&dev->inqueue)) {
639 if (!(*f))
640 (*f) = list_entry(dev->inqueue.next,
641 struct em2820_frame_t, frame);
642
643 for (i = 0; i < urb->number_of_packets; i++) {
644 unsigned char *buf = urb->transfer_buffer +
645 urb->iso_frame_desc[i].offset;
646 int len = urb->iso_frame_desc[i].actual_length - 4;
647
648 if (urb->iso_frame_desc[i].status) {
649 em2820_isocdbg("data error: [%d] len=%d, status=%d", i,
650 urb->iso_frame_desc[i].actual_length,
651 urb->iso_frame_desc[i].status);
652 continue;
653 }
654 if (urb->iso_frame_desc[i].actual_length <= 0) {
655 em2820_isocdbg("packet %d is empty",i);
656 continue;
657 }
658 if (urb->iso_frame_desc[i].actual_length >
659 dev->max_pkt_size) {
660 em2820_isocdbg("packet bigger than packet size");
661 continue;
662 }
663 /*new frame */
664 if (buf[0] == 0x22 && buf[1] == 0x5a) {
665 em2820_isocdbg("Video frame, length=%i!",len);
666
667 if (em2820_isoc_video(dev,f,&lock_flags,buf[2]))
668 break;
669 } else if (buf[0]==0x33 && buf[1]==0x95 && buf[2]==0x00) {
670 em2820_isocdbg("VBI HEADER!!!");
671 }
672
673 /* actual copying */
674 if ((*f)->state == F_GRABBING) {
675 em2820_isoc_video_copy(dev,f,buf, len);
676 }
677 }
678 }
679
680 for (i = 0; i < urb->number_of_packets; i++) {
681 urb->iso_frame_desc[i].status = 0;
682 urb->iso_frame_desc[i].actual_length = 0;
683 }
684
685 urb->status = 0;
686 if ((status = usb_submit_urb(urb, GFP_ATOMIC))) {
687 em2820_errdev("resubmit of urb failed (error=%i)\n", status);
688 dev->state |= DEV_MISCONFIGURED;
689 }
690 wake_up_interruptible(&dev->wait_frame);
691 return;
692}
693
694/*
695 * em2820_uninit_isoc()
696 * deallocates the buffers and urbs allocated during em2820_init_iosc()
697 */
698void em2820_uninit_isoc(struct em2820 *dev)
699{
700 int i;
701
702 for (i = 0; i < EM2820_NUM_BUFS; i++) {
703 if (dev->urb[i]) {
704 usb_kill_urb(dev->urb[i]);
705 usb_free_urb(dev->urb[i]);
706 }
707 dev->urb[i] = NULL;
708 if (dev->transfer_buffer[i])
709 kfree(dev->transfer_buffer[i]);
710 dev->transfer_buffer[i] = NULL;
711 }
712 em2820_capture_start(dev, 0);
713}
714
715/*
716 * em2820_init_isoc()
717 * allocates transfer buffers and submits the urbs for isoc transfer
718 */
719int em2820_init_isoc(struct em2820 *dev)
720{
721 /* change interface to 3 which allowes the biggest packet sizes */
722 int i, errCode;
723 const int sb_size = EM2820_NUM_PACKETS * dev->max_pkt_size;
724
725 /* reset streaming vars */
726 dev->frame_current = NULL;
727 dev->frame_count = 0;
728
729 /* allocate urbs */
730 for (i = 0; i < EM2820_NUM_BUFS; i++) {
731 struct urb *urb;
732 int j, k;
733 /* allocate transfer buffer */
734 dev->transfer_buffer[i] = kmalloc(sb_size, GFP_KERNEL);
735 if (!dev->transfer_buffer[i]) {
736 em2820_errdev
737 ("unable to allocate %i bytes for transfer buffer %i\n",
738 sb_size, i);
739 em2820_uninit_isoc(dev);
740 return -ENOMEM;
741 }
742 memset(dev->transfer_buffer[i], 0, sb_size);
743 urb = usb_alloc_urb(EM2820_NUM_PACKETS, GFP_KERNEL);
744 if (urb) {
745 urb->dev = dev->udev;
746 urb->context = dev;
747 urb->pipe = usb_rcvisocpipe(dev->udev, 0x82);
748 urb->transfer_flags = URB_ISO_ASAP;
749 urb->interval = 1;
750 urb->transfer_buffer = dev->transfer_buffer[i];
751 urb->complete = em2820_isocIrq;
752 urb->number_of_packets = EM2820_NUM_PACKETS;
753 urb->transfer_buffer_length = sb_size;
754 for (j = k = 0; j < EM2820_NUM_PACKETS;
755 j++, k += dev->max_pkt_size) {
756 urb->iso_frame_desc[j].offset = k;
757 urb->iso_frame_desc[j].length =
758 dev->max_pkt_size;
759 }
760 dev->urb[i] = urb;
761 } else {
762 em2820_errdev("cannot alloc urb %i\n", i);
763 em2820_uninit_isoc(dev);
764 return -ENOMEM;
765 }
766 }
767
768 /* submit urbs */
769 for (i = 0; i < EM2820_NUM_BUFS; i++) {
770 errCode = usb_submit_urb(dev->urb[i], GFP_KERNEL);
771 if (errCode) {
772 em2820_errdev("submit of urb %i failed (error=%i)\n", i,
773 errCode);
774 em2820_uninit_isoc(dev);
775 return errCode;
776 }
777 }
778
779 return 0;
780}
781
782int em2820_set_alternate(struct em2820 *dev)
783{
784 int errCode, prev_alt = dev->alt;
785 dev->alt = alt;
786 if (dev->alt == 0) {
787 int i;
596d92d5
MCC		 788 if(dev->is_em2800){ /* always use the max packet size for em2800 based devices */
789 for(i=0;i< EM2820_MAX_ALT; i++)
790 if(dev->alt_max_pkt_size[i]>dev->alt_max_pkt_size[dev->alt])
791 dev->alt=i;
792 }else{
a6c2ba28 793 unsigned int min_pkt_size = dev->field_size / 137; /* FIXME: empiric magic number */
794 em2820_coredbg("minimum isoc packet size: %u", min_pkt_size);
795 dev->alt = 7;
796 for (i = 1; i < EM2820_MAX_ALT; i += 2) /* FIXME: skip even alternate: why do they not work? */
797 if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
798 dev->alt = i;
799 break;
800 }
596d92d5 801 }
a6c2ba28 802 }
803
804 if (dev->alt != prev_alt) {
805 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
806 em2820_coredbg("setting alternate %d with wMaxPacketSize=%u", dev->alt,
807 dev->max_pkt_size);
808 errCode = usb_set_interface(dev->udev, 0, dev->alt);
809 if (errCode < 0) {
810 em2820_errdev
811 ("cannot change alternate number to %d (error=%i)\n",
812 dev->alt, errCode);
813 return errCode;
814 }
815 }
816 return 0;
817}
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