em28xx-core.c revision 5e453dc757385ec892a818e4e3b5de027987ced9
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 35static unsigned int core_debug = 0; 36module_param(core_debug,int,0644); 37MODULE_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 44static unsigned int reg_debug = 0; 45module_param(reg_debug,int,0644); 46MODULE_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 53static unsigned int isoc_debug = 0; 54module_param(isoc_debug,int,0644); 55MODULE_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 62static int alt = EM28XX_PINOUT; 63module_param(alt, int, 0644); 64MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint"); 65 66 67/* 68 * em28xx_request_buffers() 69 * allocate a number of buffers 70 */ 71u32 em28xx_request_buffers(struct em28xx *dev, u32 count) 72{ 73 const size_t imagesize = PAGE_ALIGN(dev->frame_size); /*needs to be page aligned cause the buffers can be mapped individually! */ 74 void *buff = NULL; 75 u32 i; 76 em28xx_coredbg("requested %i buffers with size %zi", count, imagesize); 77 if (count > EM28XX_NUM_FRAMES) 78 count = EM28XX_NUM_FRAMES; 79 80 dev->num_frames = count; 81 while (dev->num_frames > 0) { 82 if ((buff = vmalloc_32(dev->num_frames * imagesize))) { 83 memset(buff, 0, dev->num_frames * imagesize); 84 break; 85 } 86 dev->num_frames--; 87 } 88 89 for (i = 0; i < dev->num_frames; i++) { 90 dev->frame[i].bufmem = buff + i * imagesize; 91 dev->frame[i].buf.index = i; 92 dev->frame[i].buf.m.offset = i * imagesize; 93 dev->frame[i].buf.length = dev->frame_size; 94 dev->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 95 dev->frame[i].buf.sequence = 0; 96 dev->frame[i].buf.field = V4L2_FIELD_NONE; 97 dev->frame[i].buf.memory = V4L2_MEMORY_MMAP; 98 dev->frame[i].buf.flags = 0; 99 } 100 return dev->num_frames; 101} 102 103/* 104 * em28xx_queue_unusedframes() 105 * add all frames that are not currently in use to the inbuffer queue 106 */ 107void em28xx_queue_unusedframes(struct em28xx *dev) 108{ 109 unsigned long lock_flags; 110 u32 i; 111 112 for (i = 0; i < dev->num_frames; i++) 113 if (dev->frame[i].state == F_UNUSED) { 114 dev->frame[i].state = F_QUEUED; 115 spin_lock_irqsave(&dev->queue_lock, lock_flags); 116 list_add_tail(&dev->frame[i].frame, &dev->inqueue); 117 spin_unlock_irqrestore(&dev->queue_lock, lock_flags); 118 } 119} 120 121/* 122 * em28xx_release_buffers() 123 * free frame buffers 124 */ 125void em28xx_release_buffers(struct em28xx *dev) 126{ 127 if (dev->num_frames) { 128 vfree(dev->frame[0].bufmem); 129 dev->num_frames = 0; 130 } 131} 132 133/* 134 * em28xx_read_reg_req() 135 * reads data from the usb device specifying bRequest 136 */ 137int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg, 138 char *buf, int len) 139{ 140 int ret, byte; 141 142 em28xx_regdbg("req=%02x, reg=%02x ", req, reg); 143 144 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req, 145 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, 146 0x0000, reg, buf, len, HZ); 147 148 if (reg_debug){ 149 printk(ret < 0 ? " failed!\n" : "%02x values: ", ret); 150 for (byte = 0; byte < len; byte++) { 151 printk(" %02x", buf[byte]); 152 } 153 printk("\n"); 154 } 155 156 return ret; 157} 158 159/* 160 * em28xx_read_reg_req() 161 * reads data from the usb device specifying bRequest 162 */ 163int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg) 164{ 165 u8 val; 166 int ret; 167 168 em28xx_regdbg("req=%02x, reg=%02x:", req, reg); 169 170 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req, 171 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, 172 0x0000, reg, &val, 1, HZ); 173 174 if (reg_debug) 175 printk(ret < 0 ? " failed!\n" : "%02x\n", val); 176 177 if (ret < 0) 178 return ret; 179 180 return val; 181} 182 183int em28xx_read_reg(struct em28xx *dev, u16 reg) 184{ 185 return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg); 186} 187 188/* 189 * em28xx_write_regs_req() 190 * sends data to the usb device, specifying bRequest 191 */ 192int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf, 193 int len) 194{ 195 int ret; 196 197 /*usb_control_msg seems to expect a kmalloced buffer */ 198 unsigned char *bufs = kmalloc(len, GFP_KERNEL); 199 200 em28xx_regdbg("req=%02x reg=%02x:", req, reg); 201 202 if (reg_debug) { 203 int i; 204 for (i = 0; i < len; ++i) 205 printk (" %02x", (unsigned char)buf[i]); 206 printk ("\n"); 207 } 208 209 if (!bufs) 210 return -ENOMEM; 211 memcpy(bufs, buf, len); 212 ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), req, 213 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, 214 0x0000, reg, bufs, len, HZ); 215 mdelay(5); /* FIXME: magic number */ 216 kfree(bufs); 217 return ret; 218} 219 220int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len) 221{ 222 return em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len); 223} 224 225/* 226 * em28xx_write_reg_bits() 227 * sets only some bits (specified by bitmask) of a register, by first reading 228 * the actual value 229 */ 230int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val, 231 u8 bitmask) 232{ 233 int oldval; 234 u8 newval; 235 if ((oldval = em28xx_read_reg(dev, reg)) < 0) 236 return oldval; 237 newval = (((u8) oldval) & ~bitmask) | (val & bitmask); 238 return em28xx_write_regs(dev, reg, &newval, 1); 239} 240 241/* 242 * em28xx_write_ac97() 243 * write a 16 bit value to the specified AC97 address (LSB first!) 244 */ 245int em28xx_write_ac97(struct em28xx *dev, u8 reg, u8 * val) 246{ 247 int ret; 248 u8 addr = reg & 0x7f; 249 if ((ret = em28xx_write_regs(dev, AC97LSB_REG, val, 2)) < 0) 250 return ret; 251 if ((ret = em28xx_write_regs(dev, AC97ADDR_REG, &addr, 1)) < 0) 252 return ret; 253 if ((ret = em28xx_read_reg(dev, AC97BUSY_REG)) < 0) 254 return ret; 255 else if (((u8) ret) & 0x01) { 256 em28xx_warn ("AC97 command still being exectuted: not handled properly!\n"); 257 } 258 return 0; 259} 260 261int em28xx_audio_analog_set(struct em28xx *dev) 262{ 263 char s[2] = { 0x00, 0x00 }; 264 s[0] |= 0x1f - dev->volume; 265 s[1] |= 0x1f - dev->volume; 266 if (dev->mute) 267 s[1] |= 0x80; 268 return em28xx_write_ac97(dev, MASTER_AC97, s); 269} 270 271 272int em28xx_colorlevels_set_default(struct em28xx *dev) 273{ 274 em28xx_write_regs(dev, YGAIN_REG, "\x10", 1); /* contrast */ 275 em28xx_write_regs(dev, YOFFSET_REG, "\x00", 1); /* brightness */ 276 em28xx_write_regs(dev, UVGAIN_REG, "\x10", 1); /* saturation */ 277 em28xx_write_regs(dev, UOFFSET_REG, "\x00", 1); 278 em28xx_write_regs(dev, VOFFSET_REG, "\x00", 1); 279 em28xx_write_regs(dev, SHARPNESS_REG, "\x00", 1); 280 281 em28xx_write_regs(dev, GAMMA_REG, "\x20", 1); 282 em28xx_write_regs(dev, RGAIN_REG, "\x20", 1); 283 em28xx_write_regs(dev, GGAIN_REG, "\x20", 1); 284 em28xx_write_regs(dev, BGAIN_REG, "\x20", 1); 285 em28xx_write_regs(dev, ROFFSET_REG, "\x00", 1); 286 em28xx_write_regs(dev, GOFFSET_REG, "\x00", 1); 287 return em28xx_write_regs(dev, BOFFSET_REG, "\x00", 1); 288} 289 290int em28xx_capture_start(struct em28xx *dev, int start) 291{ 292 int ret; 293 /* FIXME: which is the best order? */ 294 /* video registers are sampled by VREF */ 295 if ((ret = em28xx_write_reg_bits(dev, USBSUSP_REG, start ? 0x10 : 0x00, 296 0x10)) < 0) 297 return ret; 298 /* enable video capture */ 299 return em28xx_write_regs(dev, VINENABLE_REG, start ? "\x67" : "\x27", 1); 300} 301 302int em28xx_outfmt_set_yuv422(struct em28xx *dev) 303{ 304 em28xx_write_regs(dev, OUTFMT_REG, "\x34", 1); 305 em28xx_write_regs(dev, VINMODE_REG, "\x10", 1); 306 return em28xx_write_regs(dev, VINCTRL_REG, "\x11", 1); 307} 308 309int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax, u8 ymin, 310 u8 ymax) 311{ 312 em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n", xmin, ymin, xmax, ymax); 313 314 em28xx_write_regs(dev, XMIN_REG, &xmin, 1); 315 em28xx_write_regs(dev, XMAX_REG, &xmax, 1); 316 em28xx_write_regs(dev, YMIN_REG, &ymin, 1); 317 return em28xx_write_regs(dev, YMAX_REG, &ymax, 1); 318} 319 320int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart, 321 u16 width, u16 height) 322{ 323 u8 cwidth = width; 324 u8 cheight = height; 325 u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01); 326 327 em28xx_coredbg("em28xx Area Set: (%d,%d)\n", (width | (overflow & 2) << 7), 328 (height | (overflow & 1) << 8)); 329 330 em28xx_write_regs(dev, HSTART_REG, &hstart, 1); 331 em28xx_write_regs(dev, VSTART_REG, &vstart, 1); 332 em28xx_write_regs(dev, CWIDTH_REG, &cwidth, 1); 333 em28xx_write_regs(dev, CHEIGHT_REG, &cheight, 1); 334 return em28xx_write_regs(dev, OFLOW_REG, &overflow, 1); 335} 336 337int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v) 338{ 339 u8 mode; 340 /* the em2800 scaler only supports scaling down to 50% */ 341 if(dev->is_em2800) 342 mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00); 343 else { 344 u8 buf[2]; 345 buf[0] = h; 346 buf[1] = h >> 8; 347 em28xx_write_regs(dev, HSCALELOW_REG, (char *)buf, 2); 348 buf[0] = v; 349 buf[1] = v >> 8; 350 em28xx_write_regs(dev, VSCALELOW_REG, (char *)buf, 2); 351 /* it seems that both H and V scalers must be active to work correctly */ 352 mode = (h || v)? 0x30: 0x00; 353 } 354 return em28xx_write_reg_bits(dev, COMPR_REG, mode, 0x30); 355} 356 357/* FIXME: this only function read values from dev */ 358int em28xx_resolution_set(struct em28xx *dev) 359{ 360 int width, height; 361 width = norm_maxw(dev); 362 height = norm_maxh(dev) >> 1; 363 364 em28xx_outfmt_set_yuv422(dev); 365 em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2); 366 em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2); 367 return em28xx_scaler_set(dev, dev->hscale, dev->vscale); 368} 369 370 371/******************* isoc transfer handling ****************************/ 372 373#ifdef ENABLE_DEBUG_ISOC_FRAMES 374static void em28xx_isoc_dump(struct urb *urb, struct pt_regs *regs) 375{ 376 int len = 0; 377 int ntrans = 0; 378 int i; 379 380 printk(KERN_DEBUG "isocIrq: sf=%d np=%d ec=%x\n", 381 urb->start_frame, urb->number_of_packets, 382 urb->error_count); 383 for (i = 0; i < urb->number_of_packets; i++) { 384 unsigned char *buf = 385 urb->transfer_buffer + 386 urb->iso_frame_desc[i].offset; 387 int alen = urb->iso_frame_desc[i].actual_length; 388 if (alen > 0) { 389 if (buf[0] == 0x88) { 390 ntrans++; 391 len += alen; 392 } else if (buf[0] == 0x22) { 393 printk(KERN_DEBUG 394 "= l=%d nt=%d bpp=%d\n", 395 len - 4 * ntrans, ntrans, 396 ntrans == 0 ? 0 : len / ntrans); 397 ntrans = 1; 398 len = alen; 399 } else 400 printk(KERN_DEBUG "!\n"); 401 } 402 printk(KERN_DEBUG " n=%d s=%d al=%d %x\n", i, 403 urb->iso_frame_desc[i].status, 404 urb->iso_frame_desc[i].actual_length, 405 (unsigned int) 406 *((unsigned char *)(urb->transfer_buffer + 407 urb->iso_frame_desc[i]. 408 offset))); 409 } 410} 411#endif 412 413static inline int em28xx_isoc_video(struct em28xx *dev,struct em28xx_frame_t **f, 414 unsigned long *lock_flags, unsigned char buf) 415{ 416 if (!(buf & 0x01)) { 417 if ((*f)->state == F_GRABBING) { 418 /*previous frame is incomplete */ 419 if ((*f)->fieldbytesused < dev->field_size) { 420 (*f)->state = F_ERROR; 421 em28xx_isocdbg ("dropping incomplete bottom field (%i missing bytes)", 422 dev->field_size-(*f)->fieldbytesused); 423 } else { 424 (*f)->state = F_DONE; 425 (*f)->buf.bytesused = dev->frame_size; 426 } 427 } 428 if ((*f)->state == F_DONE || (*f)->state == F_ERROR) { 429 /* move current frame to outqueue and get next free buffer from inqueue */ 430 spin_lock_irqsave(&dev-> queue_lock, *lock_flags); 431 list_move_tail(&(*f)->frame, &dev->outqueue); 432 if (!list_empty(&dev->inqueue)) 433 (*f) = list_entry(dev-> inqueue.next, 434 struct em28xx_frame_t,frame); 435 else 436 (*f) = NULL; 437 spin_unlock_irqrestore(&dev->queue_lock,*lock_flags); 438 } 439 if (!(*f)) { 440 em28xx_isocdbg ("new frame but no buffer is free"); 441 return -1; 442 } 443 do_gettimeofday(&(*f)->buf.timestamp); 444 (*f)->buf.sequence = ++dev->frame_count; 445 (*f)->buf.field = V4L2_FIELD_INTERLACED; 446 (*f)->state = F_GRABBING; 447 (*f)->buf.bytesused = 0; 448 (*f)->top_field = 1; 449 (*f)->fieldbytesused = 0; 450 } else { 451 /* acquiring bottom field */ 452 if ((*f)->state == F_GRABBING) { 453 if (!(*f)->top_field) { 454 (*f)->state = F_ERROR; 455 em28xx_isocdbg ("unexpected begin of bottom field; discarding it"); 456 } else if ((*f)-> fieldbytesused < dev->field_size - 172) { 457 (*f)->state = F_ERROR; 458 em28xx_isocdbg ("dropping incomplete top field (%i missing bytes)", 459 dev->field_size-(*f)->fieldbytesused); 460 } else { 461 (*f)->top_field = 0; 462 (*f)->fieldbytesused = 0; 463 } 464 } 465 } 466 return (0); 467} 468 469static inline void em28xx_isoc_video_copy(struct em28xx *dev, 470 struct em28xx_frame_t **f, unsigned char *buf, int len) 471{ 472 void *fieldstart, *startwrite, *startread; 473 int linesdone, currlinedone, offset, lencopy,remain; 474 475 if(dev->frame_size != (*f)->buf.length){ 476 em28xx_err("frame_size %i and buf.length %i are different!!!\n",dev->frame_size,(*f)->buf.length); 477 return; 478 } 479 480 if ((*f)->fieldbytesused + len > dev->field_size) 481 len =dev->field_size - (*f)->fieldbytesused; 482 483 if (buf[0] != 0x88 && buf[0] != 0x22) { 484 em28xx_isocdbg("frame is not complete\n"); 485 startread = buf; 486 len+=4; 487 } else 488 startread = buf + 4; 489 490 remain = len; 491 492 if ((*f)->top_field) 493 fieldstart = (*f)->bufmem; 494 else 495 fieldstart = (*f)->bufmem + dev->bytesperline; 496 497 linesdone = (*f)->fieldbytesused / dev->bytesperline; 498 currlinedone = (*f)->fieldbytesused % dev->bytesperline; 499 offset = linesdone * dev->bytesperline * 2 + currlinedone; 500 startwrite = fieldstart + offset; 501 lencopy = dev->bytesperline - currlinedone; 502 lencopy = lencopy > remain ? remain : lencopy; 503 504 memcpy(startwrite, startread, lencopy); 505 remain -= lencopy; 506 507 while (remain > 0) { 508 startwrite += lencopy + dev->bytesperline; 509 startread += lencopy; 510 if (dev->bytesperline > remain) 511 lencopy = remain; 512 else 513 lencopy = dev->bytesperline; 514 515 memcpy(startwrite, startread, lencopy); 516 remain -= lencopy; 517 } 518 519 (*f)->fieldbytesused += len; 520} 521 522/* 523 * em28xx_isoIrq() 524 * handles the incoming isoc urbs and fills the frames from our inqueue 525 */ 526void em28xx_isocIrq(struct urb *urb, struct pt_regs *regs) 527{ 528 struct em28xx *dev = urb->context; 529 int i, status; 530 struct em28xx_frame_t **f; 531 unsigned long lock_flags; 532 533 if (!dev) 534 return; 535#ifdef ENABLE_DEBUG_ISOC_FRAMES 536 if (isoc_debug>1) 537 em28xx_isoc_dump(urb, regs); 538#endif 539 540 if (urb->status == -ENOENT) 541 return; 542 543 f = &dev->frame_current; 544 545 if (dev->stream == STREAM_INTERRUPT) { 546 dev->stream = STREAM_OFF; 547 if ((*f)) 548 (*f)->state = F_QUEUED; 549 em28xx_isocdbg("stream interrupted"); 550 wake_up_interruptible(&dev->wait_stream); 551 } 552 553 if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED)) 554 return; 555 556 if (dev->stream == STREAM_ON && !list_empty(&dev->inqueue)) { 557 if (!(*f)) 558 (*f) = list_entry(dev->inqueue.next, 559 struct em28xx_frame_t, frame); 560 561 for (i = 0; i < urb->number_of_packets; i++) { 562 unsigned char *buf = urb->transfer_buffer + 563 urb->iso_frame_desc[i].offset; 564 int len = urb->iso_frame_desc[i].actual_length - 4; 565 566 if (urb->iso_frame_desc[i].status) { 567 em28xx_isocdbg("data error: [%d] len=%d, status=%d", i, 568 urb->iso_frame_desc[i].actual_length, 569 urb->iso_frame_desc[i].status); 570 if (urb->iso_frame_desc[i].status != -EPROTO) 571 continue; 572 } 573 if (urb->iso_frame_desc[i].actual_length <= 0) { 574 em28xx_isocdbg("packet %d is empty",i); 575 continue; 576 } 577 if (urb->iso_frame_desc[i].actual_length > 578 dev->max_pkt_size) { 579 em28xx_isocdbg("packet bigger than packet size"); 580 continue; 581 } 582 /*new frame */ 583 if (buf[0] == 0x22 && buf[1] == 0x5a) { 584 em28xx_isocdbg("Video frame, length=%i!",len); 585 586 if (em28xx_isoc_video(dev,f,&lock_flags,buf[2])) 587 break; 588 } else if (buf[0]==0x33 && buf[1]==0x95 && buf[2]==0x00) { 589 em28xx_isocdbg("VBI HEADER!!!"); 590 } 591 592 /* actual copying */ 593 if ((*f)->state == F_GRABBING) { 594 em28xx_isoc_video_copy(dev,f,buf, len); 595 } 596 } 597 } 598 599 for (i = 0; i < urb->number_of_packets; i++) { 600 urb->iso_frame_desc[i].status = 0; 601 urb->iso_frame_desc[i].actual_length = 0; 602 } 603 604 urb->status = 0; 605 if ((status = usb_submit_urb(urb, GFP_ATOMIC))) { 606 em28xx_errdev("resubmit of urb failed (error=%i)\n", status); 607 dev->state |= DEV_MISCONFIGURED; 608 } 609 wake_up_interruptible(&dev->wait_frame); 610 return; 611} 612 613/* 614 * em28xx_uninit_isoc() 615 * deallocates the buffers and urbs allocated during em28xx_init_iosc() 616 */ 617void em28xx_uninit_isoc(struct em28xx *dev) 618{ 619 int i; 620 621 for (i = 0; i < EM28XX_NUM_BUFS; i++) { 622 if (dev->urb[i]) { 623 usb_kill_urb(dev->urb[i]); 624 if (dev->transfer_buffer[i]){ 625 usb_buffer_free(dev->udev,(EM28XX_NUM_PACKETS*dev->max_pkt_size),dev->transfer_buffer[i],dev->urb[i]->transfer_dma); 626 } 627 usb_free_urb(dev->urb[i]); 628 } 629 dev->urb[i] = NULL; 630 dev->transfer_buffer[i] = NULL; 631 } 632 em28xx_capture_start(dev, 0); 633} 634 635/* 636 * em28xx_init_isoc() 637 * allocates transfer buffers and submits the urbs for isoc transfer 638 */ 639int em28xx_init_isoc(struct em28xx *dev) 640{ 641 /* change interface to 3 which allowes the biggest packet sizes */ 642 int i, errCode; 643 const int sb_size = EM28XX_NUM_PACKETS * dev->max_pkt_size; 644 645 /* reset streaming vars */ 646 dev->frame_current = NULL; 647 dev->frame_count = 0; 648 649 /* allocate urbs */ 650 for (i = 0; i < EM28XX_NUM_BUFS; i++) { 651 struct urb *urb; 652 int j, k; 653 /* allocate transfer buffer */ 654 urb = usb_alloc_urb(EM28XX_NUM_PACKETS, GFP_KERNEL); 655 if (!urb){ 656 em28xx_errdev("cannot alloc urb %i\n", i); 657 em28xx_uninit_isoc(dev); 658 return -ENOMEM; 659 } 660 dev->transfer_buffer[i] = usb_buffer_alloc(dev->udev, sb_size, GFP_KERNEL,&urb->transfer_dma); 661 if (!dev->transfer_buffer[i]) { 662 em28xx_errdev 663 ("unable to allocate %i bytes for transfer buffer %i\n", 664 sb_size, i); 665 em28xx_uninit_isoc(dev); 666 return -ENOMEM; 667 } 668 memset(dev->transfer_buffer[i], 0, sb_size); 669 urb->dev = dev->udev; 670 urb->context = dev; 671 urb->pipe = usb_rcvisocpipe(dev->udev, 0x82); 672 urb->transfer_flags = URB_ISO_ASAP; 673 urb->interval = 1; 674 urb->transfer_buffer = dev->transfer_buffer[i]; 675 urb->complete = em28xx_isocIrq; 676 urb->number_of_packets = EM28XX_NUM_PACKETS; 677 urb->transfer_buffer_length = sb_size; 678 for (j = k = 0; j < EM28XX_NUM_PACKETS; 679 j++, k += dev->max_pkt_size) { 680 urb->iso_frame_desc[j].offset = k; 681 urb->iso_frame_desc[j].length = 682 dev->max_pkt_size; 683 } 684 dev->urb[i] = urb; 685 } 686 687 /* submit urbs */ 688 for (i = 0; i < EM28XX_NUM_BUFS; i++) { 689 errCode = usb_submit_urb(dev->urb[i], GFP_KERNEL); 690 if (errCode) { 691 em28xx_errdev("submit of urb %i failed (error=%i)\n", i, 692 errCode); 693 em28xx_uninit_isoc(dev); 694 return errCode; 695 } 696 } 697 698 return 0; 699} 700 701int em28xx_set_alternate(struct em28xx *dev) 702{ 703 int errCode, prev_alt = dev->alt; 704 dev->alt = alt; 705 if (dev->alt == 0) { 706 int i; 707 for(i=0;i< dev->num_alt; i++) 708 if(dev->alt_max_pkt_size[i]>dev->alt_max_pkt_size[dev->alt]) 709 dev->alt=i; 710 } 711 712 if (dev->alt != prev_alt) { 713 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt]; 714 em28xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n", dev->alt, 715 dev->max_pkt_size); 716 errCode = usb_set_interface(dev->udev, 0, dev->alt); 717 if (errCode < 0) { 718 em28xx_errdev ("cannot change alternate number to %d (error=%i)\n", 719 dev->alt, errCode); 720 return errCode; 721 } 722 } 723 return 0; 724} 725