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[deliverable/linux.git] / drivers / media / video / em28xx / em28xx-core.c
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a6c2ba28 1/*
3acf2809 2 em28xx-core.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
a6c2ba28 3
f7abcd38
MCC		 4 Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
5 Markus Rechberger <mrechberger@gmail.com>
4ac97914 6 Mauro Carvalho Chehab <mchehab@brturbo.com.br>
f7abcd38 7 Sascha Sommer <saschasommer@freenet.de>
a6c2ba28 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>
a6c2ba28 28#include <linux/usb.h>
29#include <linux/vmalloc.h>
30
f7abcd38 31#include "em28xx.h"
a6c2ba28 32
33/* #define ENABLE_DEBUG_ISOC_FRAMES */
34
943a4902 35static unsigned int core_debug;
a6c2ba28 36module_param(core_debug,int,0644);
37MODULE_PARM_DESC(core_debug,"enable debug messages [core]");
38
3acf2809 39#define em28xx_coredbg(fmt, arg...) do {\
4ac97914
MCC		 40 if (core_debug) \
41 printk(KERN_INFO "%s %s :"fmt, \
674434c6 42 dev->name, __FUNCTION__, ##arg); } while (0)
a6c2ba28 43
943a4902 44static unsigned int reg_debug;
a6c2ba28 45module_param(reg_debug,int,0644);
46MODULE_PARM_DESC(reg_debug,"enable debug messages [URB reg]");
47
3acf2809 48#define em28xx_regdbg(fmt, arg...) do {\
4ac97914
MCC		 49 if (reg_debug) \
50 printk(KERN_INFO "%s %s :"fmt, \
674434c6 51 dev->name, __FUNCTION__, ##arg); } while (0)
a6c2ba28 52
943a4902 53static unsigned int isoc_debug;
a6c2ba28 54module_param(isoc_debug,int,0644);
55b8b2d1 55MODULE_PARM_DESC(isoc_debug,"enable debug messages [isoc transfers]");
a6c2ba28 56
3acf2809 57#define em28xx_isocdbg(fmt, arg...) do {\
4ac97914
MCC		 58 if (isoc_debug) \
59 printk(KERN_INFO "%s %s :"fmt, \
674434c6 60 dev->name, __FUNCTION__, ##arg); } while (0)
a6c2ba28 61
3acf2809 62static int alt = EM28XX_PINOUT;
a6c2ba28 63module_param(alt, int, 0644);
64MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
65
66/* ------------------------------------------------------------------ */
67/* debug help functions */
68
69static 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
77static 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
3acf2809 91void em28xx_print_ioctl(char *name, unsigned int cmd)
a6c2ba28 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
674434c6 119
a6c2ba28 120/*
3acf2809 121 * em28xx_request_buffers()
a6c2ba28 122 * allocate a number of buffers
123 */
3acf2809 124u32 em28xx_request_buffers(struct em28xx *dev, u32 count)
a6c2ba28 125{
126 const size_t imagesize = PAGE_ALIGN(dev->frame_size); /*needs to be page aligned cause the buffers can be mapped individually! */
127 void *buff = NULL;
128 u32 i;
8bcc2476 129 em28xx_coredbg("requested %i buffers with size %zd", count, imagesize);
3acf2809
MCC		 130 if (count > EM28XX_NUM_FRAMES)
131 count = EM28XX_NUM_FRAMES;
a6c2ba28 132
133 dev->num_frames = count;
134 while (dev->num_frames > 0) {
3639c861
SS		 135 if ((buff = vmalloc_32(dev->num_frames * imagesize))) {
136 memset(buff, 0, dev->num_frames * imagesize);
a6c2ba28 137 break;
3639c861 138 }
a6c2ba28 139 dev->num_frames--;
140 }
141
142 for (i = 0; i < dev->num_frames; i++) {
143 dev->frame[i].bufmem = buff + i * imagesize;
144 dev->frame[i].buf.index = i;
145 dev->frame[i].buf.m.offset = i * imagesize;
146 dev->frame[i].buf.length = dev->frame_size;
147 dev->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
148 dev->frame[i].buf.sequence = 0;
149 dev->frame[i].buf.field = V4L2_FIELD_NONE;
150 dev->frame[i].buf.memory = V4L2_MEMORY_MMAP;
151 dev->frame[i].buf.flags = 0;
152 }
153 return dev->num_frames;
154}
155
156/*
3acf2809 157 * em28xx_queue_unusedframes()
a6c2ba28 158 * add all frames that are not currently in use to the inbuffer queue
159 */
3acf2809 160void em28xx_queue_unusedframes(struct em28xx *dev)
a6c2ba28 161{
162 unsigned long lock_flags;
163 u32 i;
164
165 for (i = 0; i < dev->num_frames; i++)
166 if (dev->frame[i].state == F_UNUSED) {
167 dev->frame[i].state = F_QUEUED;
168 spin_lock_irqsave(&dev->queue_lock, lock_flags);
169 list_add_tail(&dev->frame[i].frame, &dev->inqueue);
170 spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
171 }
172}
173
174/*
3acf2809 175 * em28xx_release_buffers()
a6c2ba28 176 * free frame buffers
177 */
3acf2809 178void em28xx_release_buffers(struct em28xx *dev)
a6c2ba28 179{
180 if (dev->num_frames) {
3639c861 181 vfree(dev->frame[0].bufmem);
a6c2ba28 182 dev->num_frames = 0;
183 }
184}
185
186/*
3acf2809 187 * em28xx_read_reg_req()
a6c2ba28 188 * reads data from the usb device specifying bRequest
189 */
3acf2809 190int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
a6c2ba28 191 char *buf, int len)
192{
193 int ret, byte;
194
3acf2809 195 em28xx_regdbg("req=%02x, reg=%02x ", req, reg);
a6c2ba28 196
197 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
198 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
199 0x0000, reg, buf, len, HZ);
200
201 if (reg_debug){
202 printk(ret < 0 ? " failed!\n" : "%02x values: ", ret);
203 for (byte = 0; byte < len; byte++) {
204 printk(" %02x", buf[byte]);
205 }
206 printk("\n");
207 }
208
209 return ret;
210}
211
212/*
3acf2809 213 * em28xx_read_reg_req()
a6c2ba28 214 * reads data from the usb device specifying bRequest
215 */
3acf2809 216int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
a6c2ba28 217{
218 u8 val;
219 int ret;
220
3acf2809 221 em28xx_regdbg("req=%02x, reg=%02x:", req, reg);
a6c2ba28 222
223 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
224 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
225 0x0000, reg, &val, 1, HZ);
226
227 if (reg_debug)
228 printk(ret < 0 ? " failed!\n" : "%02x\n", val);
229
230 if (ret < 0)
231 return ret;
232
233 return val;
234}
235
3acf2809 236int em28xx_read_reg(struct em28xx *dev, u16 reg)
a6c2ba28 237{
3acf2809 238 return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
a6c2ba28 239}
240
241/*
3acf2809 242 * em28xx_write_regs_req()
a6c2ba28 243 * sends data to the usb device, specifying bRequest
244 */
3acf2809 245int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
a6c2ba28 246 int len)
247{
248 int ret;
249
250 /*usb_control_msg seems to expect a kmalloced buffer */
251 unsigned char *bufs = kmalloc(len, GFP_KERNEL);
252
3acf2809 253 em28xx_regdbg("req=%02x reg=%02x:", req, reg);
a6c2ba28 254
255 if (reg_debug) {
256 int i;
257 for (i = 0; i < len; ++i)
258 printk (" %02x", (unsigned char)buf[i]);
259 printk ("\n");
260 }
261
262 if (!bufs)
263 return -ENOMEM;
264 memcpy(bufs, buf, len);
265 ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), req,
266 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
267 0x0000, reg, bufs, len, HZ);
268 mdelay(5); /* FIXME: magic number */
269 kfree(bufs);
270 return ret;
271}
272
3acf2809 273int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
a6c2ba28 274{
3acf2809 275 return em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
a6c2ba28 276}
277
278/*
3acf2809 279 * em28xx_write_reg_bits()
a6c2ba28 280 * sets only some bits (specified by bitmask) of a register, by first reading
281 * the actual value
282 */
3acf2809 283int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
a6c2ba28 284 u8 bitmask)
285{
286 int oldval;
287 u8 newval;
3acf2809 288 if ((oldval = em28xx_read_reg(dev, reg)) < 0)
a6c2ba28 289 return oldval;
290 newval = (((u8) oldval) & ~bitmask) | (val & bitmask);
3acf2809 291 return em28xx_write_regs(dev, reg, &newval, 1);
a6c2ba28 292}
293
294/*
3acf2809 295 * em28xx_write_ac97()
a6c2ba28 296 * write a 16 bit value to the specified AC97 address (LSB first!)
297 */
3acf2809 298int em28xx_write_ac97(struct em28xx *dev, u8 reg, u8 * val)
a6c2ba28 299{
300 int ret;
301 u8 addr = reg & 0x7f;
3acf2809 302 if ((ret = em28xx_write_regs(dev, AC97LSB_REG, val, 2)) < 0)
a6c2ba28 303 return ret;
3acf2809 304 if ((ret = em28xx_write_regs(dev, AC97ADDR_REG, &addr, 1)) < 0)
a6c2ba28 305 return ret;
3acf2809 306 if ((ret = em28xx_read_reg(dev, AC97BUSY_REG)) < 0)
a6c2ba28 307 return ret;
308 else if (((u8) ret) & 0x01) {
3acf2809 309 em28xx_warn ("AC97 command still being exectuted: not handled properly!\n");
a6c2ba28 310 }
311 return 0;
312}
313
3acf2809 314int em28xx_audio_analog_set(struct em28xx *dev)
a6c2ba28 315{
316 char s[2] = { 0x00, 0x00 };
317 s[0] |= 0x1f - dev->volume;
318 s[1] |= 0x1f - dev->volume;
319 if (dev->mute)
320 s[1] |= 0x80;
3acf2809 321 return em28xx_write_ac97(dev, MASTER_AC97, s);
a6c2ba28 322}
323
324
3acf2809 325int em28xx_colorlevels_set_default(struct em28xx *dev)
a6c2ba28 326{
3acf2809
MCC		 327 em28xx_write_regs(dev, YGAIN_REG, "\x10", 1); /* contrast */
328 em28xx_write_regs(dev, YOFFSET_REG, "\x00", 1); /* brightness */
329 em28xx_write_regs(dev, UVGAIN_REG, "\x10", 1); /* saturation */
330 em28xx_write_regs(dev, UOFFSET_REG, "\x00", 1);
331 em28xx_write_regs(dev, VOFFSET_REG, "\x00", 1);
332 em28xx_write_regs(dev, SHARPNESS_REG, "\x00", 1);
333
334 em28xx_write_regs(dev, GAMMA_REG, "\x20", 1);
335 em28xx_write_regs(dev, RGAIN_REG, "\x20", 1);
336 em28xx_write_regs(dev, GGAIN_REG, "\x20", 1);
337 em28xx_write_regs(dev, BGAIN_REG, "\x20", 1);
338 em28xx_write_regs(dev, ROFFSET_REG, "\x00", 1);
339 em28xx_write_regs(dev, GOFFSET_REG, "\x00", 1);
340 return em28xx_write_regs(dev, BOFFSET_REG, "\x00", 1);
a6c2ba28 341}
342
3acf2809 343int em28xx_capture_start(struct em28xx *dev, int start)
a6c2ba28 344{
345 int ret;
346 /* FIXME: which is the best order? */
347 /* video registers are sampled by VREF */
3acf2809 348 if ((ret = em28xx_write_reg_bits(dev, USBSUSP_REG, start ? 0x10 : 0x00,
a6c2ba28 349 0x10)) < 0)
350 return ret;
351 /* enable video capture */
3acf2809 352 return em28xx_write_regs(dev, VINENABLE_REG, start ? "\x67" : "\x27", 1);
a6c2ba28 353}
354
3acf2809 355int em28xx_outfmt_set_yuv422(struct em28xx *dev)
a6c2ba28 356{
3acf2809
MCC		 357 em28xx_write_regs(dev, OUTFMT_REG, "\x34", 1);
358 em28xx_write_regs(dev, VINMODE_REG, "\x10", 1);
359 return em28xx_write_regs(dev, VINCTRL_REG, "\x11", 1);
a6c2ba28 360}
361
3acf2809 362int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax, u8 ymin,
a6c2ba28 363 u8 ymax)
364{
3acf2809 365 em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n", xmin, ymin, xmax, ymax);
a6c2ba28 366
3acf2809
MCC		 367 em28xx_write_regs(dev, XMIN_REG, &xmin, 1);
368 em28xx_write_regs(dev, XMAX_REG, &xmax, 1);
369 em28xx_write_regs(dev, YMIN_REG, &ymin, 1);
370 return em28xx_write_regs(dev, YMAX_REG, &ymax, 1);
a6c2ba28 371}
372
3acf2809 373int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
a6c2ba28 374 u16 width, u16 height)
375{
376 u8 cwidth = width;
377 u8 cheight = height;
378 u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
379
3acf2809 380 em28xx_coredbg("em28xx Area Set: (%d,%d)\n", (width | (overflow & 2) << 7),
a6c2ba28 381 (height | (overflow & 1) << 8));
382
3acf2809
MCC		 383 em28xx_write_regs(dev, HSTART_REG, &hstart, 1);
384 em28xx_write_regs(dev, VSTART_REG, &vstart, 1);
385 em28xx_write_regs(dev, CWIDTH_REG, &cwidth, 1);
386 em28xx_write_regs(dev, CHEIGHT_REG, &cheight, 1);
387 return em28xx_write_regs(dev, OFLOW_REG, &overflow, 1);
a6c2ba28 388}
389
3acf2809 390int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
a6c2ba28 391{
52c02fcd
SS		 392 u8 mode;
393 /* the em2800 scaler only supports scaling down to 50% */
394 if(dev->is_em2800)
395 mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
396 else {
397 u8 buf[2];
398 buf[0] = h;
399 buf[1] = h >> 8;
3acf2809 400 em28xx_write_regs(dev, HSCALELOW_REG, (char *)buf, 2);
52c02fcd
SS		 401 buf[0] = v;
402 buf[1] = v >> 8;
3acf2809 403 em28xx_write_regs(dev, VSCALELOW_REG, (char *)buf, 2);
52c02fcd
SS		 404 /* it seems that both H and V scalers must be active to work correctly */
405 mode = (h || v)? 0x30: 0x00;
74458e6c 406 }
3acf2809 407 return em28xx_write_reg_bits(dev, COMPR_REG, mode, 0x30);
a6c2ba28 408}
409
410/* FIXME: this only function read values from dev */
3acf2809 411int em28xx_resolution_set(struct em28xx *dev)
a6c2ba28 412{
413 int width, height;
414 width = norm_maxw(dev);
415 height = norm_maxh(dev) >> 1;
416
3acf2809
MCC		 417 em28xx_outfmt_set_yuv422(dev);
418 em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
419 em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
420 return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
a6c2ba28 421}
422
423
424/******************* isoc transfer handling ****************************/
425
426#ifdef ENABLE_DEBUG_ISOC_FRAMES
3acf2809 427static void em28xx_isoc_dump(struct urb *urb, struct pt_regs *regs)
a6c2ba28 428{
429 int len = 0;
430 int ntrans = 0;
431 int i;
432
433 printk(KERN_DEBUG "isocIrq: sf=%d np=%d ec=%x\n",
434 urb->start_frame, urb->number_of_packets,
435 urb->error_count);
436 for (i = 0; i < urb->number_of_packets; i++) {
437 unsigned char *buf =
438 urb->transfer_buffer +
439 urb->iso_frame_desc[i].offset;
440 int alen = urb->iso_frame_desc[i].actual_length;
441 if (alen > 0) {
442 if (buf[0] == 0x88) {
443 ntrans++;
444 len += alen;
445 } else if (buf[0] == 0x22) {
446 printk(KERN_DEBUG
447 "= l=%d nt=%d bpp=%d\n",
448 len - 4 * ntrans, ntrans,
449 ntrans == 0 ? 0 : len / ntrans);
450 ntrans = 1;
451 len = alen;
452 } else
453 printk(KERN_DEBUG "!\n");
454 }
455 printk(KERN_DEBUG " n=%d s=%d al=%d %x\n", i,
456 urb->iso_frame_desc[i].status,
457 urb->iso_frame_desc[i].actual_length,
458 (unsigned int)
459 *((unsigned char *)(urb->transfer_buffer +
460 urb->iso_frame_desc[i].
461 offset)));
462 }
463}
464#endif
465
3acf2809 466static inline int em28xx_isoc_video(struct em28xx *dev,struct em28xx_frame_t **f,
a6c2ba28 467 unsigned long *lock_flags, unsigned char buf)
468{
469 if (!(buf & 0x01)) {
470 if ((*f)->state == F_GRABBING) {
471 /*previous frame is incomplete */
472 if ((*f)->fieldbytesused < dev->field_size) {
473 (*f)->state = F_ERROR;
3acf2809 474 em28xx_isocdbg ("dropping incomplete bottom field (%i missing bytes)",
a6c2ba28 475 dev->field_size-(*f)->fieldbytesused);
476 } else {
477 (*f)->state = F_DONE;
478 (*f)->buf.bytesused = dev->frame_size;
479 }
480 }
481 if ((*f)->state == F_DONE || (*f)->state == F_ERROR) {
482 /* move current frame to outqueue and get next free buffer from inqueue */
483 spin_lock_irqsave(&dev-> queue_lock, *lock_flags);
484 list_move_tail(&(*f)->frame, &dev->outqueue);
485 if (!list_empty(&dev->inqueue))
486 (*f) = list_entry(dev-> inqueue.next,
3acf2809 487 struct em28xx_frame_t,frame);
a6c2ba28 488 else
489 (*f) = NULL;
490 spin_unlock_irqrestore(&dev->queue_lock,*lock_flags);
491 }
492 if (!(*f)) {
3acf2809 493 em28xx_isocdbg ("new frame but no buffer is free");
a6c2ba28 494 return -1;
495 }
496 do_gettimeofday(&(*f)->buf.timestamp);
497 (*f)->buf.sequence = ++dev->frame_count;
498 (*f)->buf.field = V4L2_FIELD_INTERLACED;
499 (*f)->state = F_GRABBING;
500 (*f)->buf.bytesused = 0;
501 (*f)->top_field = 1;
502 (*f)->fieldbytesused = 0;
503 } else {
504 /* acquiring bottom field */
505 if ((*f)->state == F_GRABBING) {
506 if (!(*f)->top_field) {
507 (*f)->state = F_ERROR;
3acf2809 508 em28xx_isocdbg ("unexpected begin of bottom field; discarding it");
a6c2ba28 509 } else if ((*f)-> fieldbytesused < dev->field_size - 172) {
510 (*f)->state = F_ERROR;
3acf2809 511 em28xx_isocdbg ("dropping incomplete top field (%i missing bytes)",
a6c2ba28 512 dev->field_size-(*f)->fieldbytesused);
513 } else {
514 (*f)->top_field = 0;
515 (*f)->fieldbytesused = 0;
516 }
517 }
518 }
519 return (0);
520}
521
3acf2809
MCC		 522static inline void em28xx_isoc_video_copy(struct em28xx *dev,
523 struct em28xx_frame_t **f, unsigned char *buf, int len)
a6c2ba28 524{
525 void *fieldstart, *startwrite, *startread;
526 int linesdone, currlinedone, offset, lencopy,remain;
527
596d92d5 528 if(dev->frame_size != (*f)->buf.length){
3acf2809 529 em28xx_err("frame_size %i and buf.length %i are different!!!\n",dev->frame_size,(*f)->buf.length);
596d92d5
MCC		 530 return;
531 }
532
a6c2ba28 533 if ((*f)->fieldbytesused + len > dev->field_size)
534 len =dev->field_size - (*f)->fieldbytesused;
feff0485
MCC		 535
536 if (buf[0] != 0x88 && buf[0] != 0x22) {
3acf2809 537 em28xx_isocdbg("frame is not complete\n");
feff0485
MCC		 538 startread = buf;
539 len+=4;
540 } else
541 startread = buf + 4;
542
a6c2ba28 543 remain = len;
feff0485 544
a6c2ba28 545 if ((*f)->top_field)
546 fieldstart = (*f)->bufmem;
547 else
548 fieldstart = (*f)->bufmem + dev->bytesperline;
549
550 linesdone = (*f)->fieldbytesused / dev->bytesperline;
551 currlinedone = (*f)->fieldbytesused % dev->bytesperline;
552 offset = linesdone * dev->bytesperline * 2 + currlinedone;
553 startwrite = fieldstart + offset;
554 lencopy = dev->bytesperline - currlinedone;
555 lencopy = lencopy > remain ? remain : lencopy;
556
557 memcpy(startwrite, startread, lencopy);
558 remain -= lencopy;
559
560 while (remain > 0) {
561 startwrite += lencopy + dev->bytesperline;
562 startread += lencopy;
563 if (dev->bytesperline > remain)
564 lencopy = remain;
565 else
566 lencopy = dev->bytesperline;
567
568 memcpy(startwrite, startread, lencopy);
569 remain -= lencopy;
570 }
571
572 (*f)->fieldbytesused += len;
573}
574
575/*
3acf2809 576 * em28xx_isoIrq()
a6c2ba28 577 * handles the incoming isoc urbs and fills the frames from our inqueue
578 */
3acf2809 579void em28xx_isocIrq(struct urb *urb, struct pt_regs *regs)
a6c2ba28 580{
3acf2809 581 struct em28xx *dev = urb->context;
a6c2ba28 582 int i, status;
3acf2809 583 struct em28xx_frame_t **f;
a6c2ba28 584 unsigned long lock_flags;
585
586 if (!dev)
587 return;
588#ifdef ENABLE_DEBUG_ISOC_FRAMES
589 if (isoc_debug>1)
3acf2809 590 em28xx_isoc_dump(urb, regs);
a6c2ba28 591#endif
592
593 if (urb->status == -ENOENT)
594 return;
595
596 f = &dev->frame_current;
597
598 if (dev->stream == STREAM_INTERRUPT) {
599 dev->stream = STREAM_OFF;
600 if ((*f))
601 (*f)->state = F_QUEUED;
3acf2809 602 em28xx_isocdbg("stream interrupted");
a6c2ba28 603 wake_up_interruptible(&dev->wait_stream);
604 }
605
606 if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
607 return;
608
609 if (dev->stream == STREAM_ON && !list_empty(&dev->inqueue)) {
610 if (!(*f))
611 (*f) = list_entry(dev->inqueue.next,
3acf2809 612 struct em28xx_frame_t, frame);
a6c2ba28 613
614 for (i = 0; i < urb->number_of_packets; i++) {
615 unsigned char *buf = urb->transfer_buffer +
616 urb->iso_frame_desc[i].offset;
617 int len = urb->iso_frame_desc[i].actual_length - 4;
618
619 if (urb->iso_frame_desc[i].status) {
3acf2809 620 em28xx_isocdbg("data error: [%d] len=%d, status=%d", i,
a6c2ba28 621 urb->iso_frame_desc[i].actual_length,
622 urb->iso_frame_desc[i].status);
feff0485
MCC		 623 if (urb->iso_frame_desc[i].status != -EPROTO)
624 continue;
a6c2ba28 625 }
626 if (urb->iso_frame_desc[i].actual_length <= 0) {
3acf2809 627 em28xx_isocdbg("packet %d is empty",i);
a6c2ba28 628 continue;
629 }
630 if (urb->iso_frame_desc[i].actual_length >
631 dev->max_pkt_size) {
3acf2809 632 em28xx_isocdbg("packet bigger than packet size");
a6c2ba28 633 continue;
634 }
635 /*new frame */
636 if (buf[0] == 0x22 && buf[1] == 0x5a) {
3acf2809 637 em28xx_isocdbg("Video frame, length=%i!",len);
a6c2ba28 638
3acf2809 639 if (em28xx_isoc_video(dev,f,&lock_flags,buf[2]))
a6c2ba28 640 break;
641 } else if (buf[0]==0x33 && buf[1]==0x95 && buf[2]==0x00) {
3acf2809 642 em28xx_isocdbg("VBI HEADER!!!");
a6c2ba28 643 }
644
645 /* actual copying */
646 if ((*f)->state == F_GRABBING) {
3acf2809 647 em28xx_isoc_video_copy(dev,f,buf, len);
a6c2ba28 648 }
649 }
650 }
651
652 for (i = 0; i < urb->number_of_packets; i++) {
653 urb->iso_frame_desc[i].status = 0;
654 urb->iso_frame_desc[i].actual_length = 0;
655 }
656
657 urb->status = 0;
658 if ((status = usb_submit_urb(urb, GFP_ATOMIC))) {
3acf2809 659 em28xx_errdev("resubmit of urb failed (error=%i)\n", status);
a6c2ba28 660 dev->state |= DEV_MISCONFIGURED;
661 }
662 wake_up_interruptible(&dev->wait_frame);
663 return;
664}
665
666/*
3acf2809
MCC		 667 * em28xx_uninit_isoc()
668 * deallocates the buffers and urbs allocated during em28xx_init_iosc()
a6c2ba28 669 */
3acf2809 670void em28xx_uninit_isoc(struct em28xx *dev)
a6c2ba28 671{
672 int i;
673
3acf2809 674 for (i = 0; i < EM28XX_NUM_BUFS; i++) {
a6c2ba28 675 if (dev->urb[i]) {
676 usb_kill_urb(dev->urb[i]);
02f74273 677 if (dev->transfer_buffer[i]){
3acf2809 678 usb_buffer_free(dev->udev,(EM28XX_NUM_PACKETS*dev->max_pkt_size),dev->transfer_buffer[i],dev->urb[i]->transfer_dma);
02f74273 679 }
a6c2ba28 680 usb_free_urb(dev->urb[i]);
681 }
682 dev->urb[i] = NULL;
a6c2ba28 683 dev->transfer_buffer[i] = NULL;
684 }
3acf2809 685 em28xx_capture_start(dev, 0);
a6c2ba28 686}
687
688/*
3acf2809 689 * em28xx_init_isoc()
a6c2ba28 690 * allocates transfer buffers and submits the urbs for isoc transfer
691 */
3acf2809 692int em28xx_init_isoc(struct em28xx *dev)
a6c2ba28 693{
694 /* change interface to 3 which allowes the biggest packet sizes */
695 int i, errCode;
3acf2809 696 const int sb_size = EM28XX_NUM_PACKETS * dev->max_pkt_size;
a6c2ba28 697
698 /* reset streaming vars */
699 dev->frame_current = NULL;
700 dev->frame_count = 0;
701
702 /* allocate urbs */
3acf2809 703 for (i = 0; i < EM28XX_NUM_BUFS; i++) {
a6c2ba28 704 struct urb *urb;
705 int j, k;
706 /* allocate transfer buffer */
3acf2809 707 urb = usb_alloc_urb(EM28XX_NUM_PACKETS, GFP_KERNEL);
02f74273 708 if (!urb){
3acf2809
MCC		 709 em28xx_errdev("cannot alloc urb %i\n", i);
710 em28xx_uninit_isoc(dev);
02f74273
MR		 711 return -ENOMEM;
712 }
713 dev->transfer_buffer[i] = usb_buffer_alloc(dev->udev, sb_size, GFP_KERNEL,&urb->transfer_dma);
a6c2ba28 714 if (!dev->transfer_buffer[i]) {
3acf2809 715 em28xx_errdev
a6c2ba28 716 ("unable to allocate %i bytes for transfer buffer %i\n",
717 sb_size, i);
3acf2809 718 em28xx_uninit_isoc(dev);
a6c2ba28 719 return -ENOMEM;
720 }
721 memset(dev->transfer_buffer[i], 0, sb_size);
02f74273
MR		 722 urb->dev = dev->udev;
723 urb->context = dev;
724 urb->pipe = usb_rcvisocpipe(dev->udev, 0x82);
725 urb->transfer_flags = URB_ISO_ASAP;
726 urb->interval = 1;
727 urb->transfer_buffer = dev->transfer_buffer[i];
3acf2809
MCC		 728 urb->complete = em28xx_isocIrq;
729 urb->number_of_packets = EM28XX_NUM_PACKETS;
02f74273 730 urb->transfer_buffer_length = sb_size;
3acf2809 731 for (j = k = 0; j < EM28XX_NUM_PACKETS;
02f74273
MR		 732 j++, k += dev->max_pkt_size) {
733 urb->iso_frame_desc[j].offset = k;
734 urb->iso_frame_desc[j].length =
735 dev->max_pkt_size;
a6c2ba28 736 }
02f74273 737 dev->urb[i] = urb;
a6c2ba28 738 }
739
740 /* submit urbs */
3acf2809 741 for (i = 0; i < EM28XX_NUM_BUFS; i++) {
a6c2ba28 742 errCode = usb_submit_urb(dev->urb[i], GFP_KERNEL);
743 if (errCode) {
3acf2809 744 em28xx_errdev("submit of urb %i failed (error=%i)\n", i,
a6c2ba28 745 errCode);
3acf2809 746 em28xx_uninit_isoc(dev);
a6c2ba28 747 return errCode;
748 }
749 }
750
751 return 0;
752}
753
3acf2809 754int em28xx_set_alternate(struct em28xx *dev)
a6c2ba28 755{
756 int errCode, prev_alt = dev->alt;
757 dev->alt = alt;
758 if (dev->alt == 0) {
759 int i;
9d4d9c05 760 for(i=0;i< dev->num_alt; i++)
eac94356
MCC		 761 if(dev->alt_max_pkt_size[i]>dev->alt_max_pkt_size[dev->alt])
762 dev->alt=i;
a6c2ba28 763 }
764
765 if (dev->alt != prev_alt) {
766 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
9d4d9c05 767 em28xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n", dev->alt,
a6c2ba28 768 dev->max_pkt_size);
769 errCode = usb_set_interface(dev->udev, 0, dev->alt);
770 if (errCode < 0) {
9d4d9c05
MCC		 771 em28xx_errdev ("cannot change alternate number to %d (error=%i)\n",
772 dev->alt, errCode);
a6c2ba28 773 return errCode;
774 }
775 }
776 return 0;
777}
Linux kernel - Deliverables
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