git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/em28xx/em28xx-core.c

   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 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 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 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< EM28XX_MAX_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", dev->alt,
 808                        dev->max_pkt_size);
 809                 errCode = usb_set_interface(dev->udev, 0, dev->alt);
 810                 if (errCode < 0) {
 811                         em28xx_errdev
 812                                         ("cannot change alternate number to %d (error=%i)\n",
 813                                          dev->alt, errCode);
 814                         return errCode;
 815                 }
 816         }
 817         return 0;
 818 }