err.no Git - linux-2.6/blob - drivers/media/video/em28xx/em28xx-core.c

   1 /*
   2    em2820-core.c - driver for Empia EM2820/2840 USB video capture devices
   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>
  29 #include <linux/usb.h>
  30 #include <linux/vmalloc.h>
  31
  32 #include "em2820.h"
  33
  34 /* #define ENABLE_DEBUG_ISOC_FRAMES */
  35
  36 unsigned int core_debug = 0;
  37 module_param(core_debug,int,0644);
  38 MODULE_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
  45 unsigned int reg_debug = 0;
  46 module_param(reg_debug,int,0644);
  47 MODULE_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
  54 unsigned int isoc_debug = 0;
  55 module_param(isoc_debug,int,0644);
  56 MODULE_PARM_DESC(core_debug,"enable debug messages [isoc transfers]");
  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
  63 static int alt = EM2820_PINOUT;
  64 module_param(alt, int, 0644);
  65 MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
  66
  67 /* ------------------------------------------------------------------ */
  68 /* debug help functions                                               */
  69
  70 static 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
  78 static 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
  92 void 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
 120 static 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
 143 static 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  */
 166 u32 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  */
 200 void 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  */
 218 void 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  */
 231 int 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  */
 257 int 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
 277 int 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  */
 286 int 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
 314 int 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  */
 324 int 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  */
 339 int 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
 355 int 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
 366 int 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
 384 int 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
 396 int 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
 403 int 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
 414 int 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
 431 int 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 */
 448 int 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
 464 static 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
 503 static 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
 559 static 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
 565         if ((*f)->fieldbytesused + len > dev->field_size)
 566                 len =dev->field_size - (*f)->fieldbytesused;
 567         remain = len;
 568         startread = buf + 4;
 569         if ((*f)->top_field)
 570                 fieldstart = (*f)->bufmem;
 571         else
 572                 fieldstart = (*f)->bufmem + dev->bytesperline;
 573
 574         linesdone = (*f)->fieldbytesused / dev->bytesperline;
 575         currlinedone = (*f)->fieldbytesused % dev->bytesperline;
 576         offset = linesdone * dev->bytesperline * 2 + currlinedone;
 577         startwrite = fieldstart + offset;
 578         lencopy = dev->bytesperline - currlinedone;
 579         lencopy = lencopy > remain ? remain : lencopy;
 580
 581         memcpy(startwrite, startread, lencopy);
 582         remain -= lencopy;
 583
 584         while (remain > 0) {
 585                 startwrite += lencopy + dev->bytesperline;
 586                 startread += lencopy;
 587                 if (dev->bytesperline > remain)
 588                         lencopy = remain;
 589                 else
 590                         lencopy = dev->bytesperline;
 591
 592                 memcpy(startwrite, startread, lencopy);
 593                 remain -= lencopy;
 594         }
 595
 596         (*f)->fieldbytesused += len;
 597 }
 598
 599 /*
 600  * em2820_isoIrq()
 601  * handles the incoming isoc urbs and fills the frames from our inqueue
 602  */
 603 void em2820_isocIrq(struct urb *urb, struct pt_regs *regs)
 604 {
 605         struct em2820 *dev = urb->context;
 606         int i, status;
 607         struct em2820_frame_t **f;
 608         unsigned long lock_flags;
 609
 610         if (!dev)
 611                 return;
 612 #ifdef ENABLE_DEBUG_ISOC_FRAMES
 613         if (isoc_debug>1)
 614                 em2820_isoc_dump(urb, regs);
 615 #endif
 616
 617         if (urb->status == -ENOENT)
 618                 return;
 619
 620         f = &dev->frame_current;
 621
 622         if (dev->stream == STREAM_INTERRUPT) {
 623                 dev->stream = STREAM_OFF;
 624                 if ((*f))
 625                         (*f)->state = F_QUEUED;
 626                 em2820_isocdbg("stream interrupted");
 627                 wake_up_interruptible(&dev->wait_stream);
 628         }
 629
 630         if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
 631                 return;
 632
 633         if (dev->stream == STREAM_ON && !list_empty(&dev->inqueue)) {
 634                 if (!(*f))
 635                         (*f) = list_entry(dev->inqueue.next,
 636                 struct em2820_frame_t, frame);
 637
 638                 for (i = 0; i < urb->number_of_packets; i++) {
 639                         unsigned char *buf = urb->transfer_buffer +
 640                                         urb->iso_frame_desc[i].offset;
 641                         int len = urb->iso_frame_desc[i].actual_length - 4;
 642
 643                         if (urb->iso_frame_desc[i].status) {
 644                                 em2820_isocdbg("data error: [%d] len=%d, status=%d", i,
 645                                         urb->iso_frame_desc[i].actual_length,
 646                                         urb->iso_frame_desc[i].status);
 647                                 continue;
 648                         }
 649                         if (urb->iso_frame_desc[i].actual_length <= 0) {
 650                                 em2820_isocdbg("packet %d is empty",i);
 651                                 continue;
 652                         }
 653                         if (urb->iso_frame_desc[i].actual_length >
 654                                                  dev->max_pkt_size) {
 655                                 em2820_isocdbg("packet bigger than packet size");
 656                                 continue;
 657                         }
 658                         /*new frame */
 659                         if (buf[0] == 0x22 && buf[1] == 0x5a) {
 660                                 em2820_isocdbg("Video frame, length=%i!",len);
 661
 662                                 if (em2820_isoc_video(dev,f,&lock_flags,buf[2]))
 663                                 break;
 664                         } else if (buf[0]==0x33 && buf[1]==0x95 && buf[2]==0x00) {
 665                                 em2820_isocdbg("VBI HEADER!!!");
 666                         }
 667
 668                         /* actual copying */
 669                         if ((*f)->state == F_GRABBING) {
 670                                 em2820_isoc_video_copy(dev,f,buf, len);
 671                         }
 672                 }
 673         }
 674
 675         for (i = 0; i < urb->number_of_packets; i++) {
 676                 urb->iso_frame_desc[i].status = 0;
 677                 urb->iso_frame_desc[i].actual_length = 0;
 678         }
 679
 680         urb->status = 0;
 681         if ((status = usb_submit_urb(urb, GFP_ATOMIC))) {
 682                 em2820_errdev("resubmit of urb failed (error=%i)\n", status);
 683                 dev->state |= DEV_MISCONFIGURED;
 684         }
 685         wake_up_interruptible(&dev->wait_frame);
 686         return;
 687 }
 688
 689 /*
 690  * em2820_uninit_isoc()
 691  * deallocates the buffers and urbs allocated during em2820_init_iosc()
 692  */
 693 void em2820_uninit_isoc(struct em2820 *dev)
 694 {
 695         int i;
 696
 697         for (i = 0; i < EM2820_NUM_BUFS; i++) {
 698                 if (dev->urb[i]) {
 699                         usb_kill_urb(dev->urb[i]);
 700                         usb_free_urb(dev->urb[i]);
 701                 }
 702                 dev->urb[i] = NULL;
 703                 if (dev->transfer_buffer[i])
 704                         kfree(dev->transfer_buffer[i]);
 705                 dev->transfer_buffer[i] = NULL;
 706         }
 707         em2820_capture_start(dev, 0);
 708 }
 709
 710 /*
 711  * em2820_init_isoc()
 712  * allocates transfer buffers and submits the urbs for isoc transfer
 713  */
 714 int em2820_init_isoc(struct em2820 *dev)
 715 {
 716         /* change interface to 3 which allowes the biggest packet sizes */
 717         int i, errCode;
 718         const int sb_size = EM2820_NUM_PACKETS * dev->max_pkt_size;
 719
 720         /* reset streaming vars */
 721         dev->frame_current = NULL;
 722         dev->frame_count = 0;
 723
 724         /* allocate urbs */
 725         for (i = 0; i < EM2820_NUM_BUFS; i++) {
 726                 struct urb *urb;
 727                 int j, k;
 728                 /* allocate transfer buffer */
 729                 dev->transfer_buffer[i] = kmalloc(sb_size, GFP_KERNEL);
 730                 if (!dev->transfer_buffer[i]) {
 731                         em2820_errdev
 732                                         ("unable to allocate %i bytes for transfer buffer %i\n",
 733                                          sb_size, i);
 734                         em2820_uninit_isoc(dev);
 735                         return -ENOMEM;
 736                 }
 737                 memset(dev->transfer_buffer[i], 0, sb_size);
 738                 urb = usb_alloc_urb(EM2820_NUM_PACKETS, GFP_KERNEL);
 739                 if (urb) {
 740                         urb->dev = dev->udev;
 741                         urb->context = dev;
 742                         urb->pipe = usb_rcvisocpipe(dev->udev, 0x82);
 743                         urb->transfer_flags = URB_ISO_ASAP;
 744                         urb->interval = 1;
 745                         urb->transfer_buffer = dev->transfer_buffer[i];
 746                         urb->complete = em2820_isocIrq;
 747                         urb->number_of_packets = EM2820_NUM_PACKETS;
 748                         urb->transfer_buffer_length = sb_size;
 749                         for (j = k = 0; j < EM2820_NUM_PACKETS;
 750                                                   j++, k += dev->max_pkt_size) {
 751                                                           urb->iso_frame_desc[j].offset = k;
 752                                                           urb->iso_frame_desc[j].length =
 753                                                                           dev->max_pkt_size;
 754                                                   }
 755                                                   dev->urb[i] = urb;
 756                 } else {
 757                         em2820_errdev("cannot alloc urb %i\n", i);
 758                         em2820_uninit_isoc(dev);
 759                         return -ENOMEM;
 760                 }
 761         }
 762
 763         /* submit urbs */
 764         for (i = 0; i < EM2820_NUM_BUFS; i++) {
 765                 errCode = usb_submit_urb(dev->urb[i], GFP_KERNEL);
 766                 if (errCode) {
 767                         em2820_errdev("submit of urb %i failed (error=%i)\n", i,
 768                                       errCode);
 769                         em2820_uninit_isoc(dev);
 770                         return errCode;
 771                 }
 772         }
 773
 774         return 0;
 775 }
 776
 777 int em2820_set_alternate(struct em2820 *dev)
 778 {
 779         int errCode, prev_alt = dev->alt;
 780         dev->alt = alt;
 781         if (dev->alt == 0) {
 782                 int i;
 783                 unsigned int min_pkt_size = dev->field_size / 137;      /* FIXME: empiric magic number */
 784                 em2820_coredbg("minimum isoc packet size: %u", min_pkt_size);
 785                 dev->alt = 7;
 786                 for (i = 1; i < EM2820_MAX_ALT; i += 2) /* FIXME: skip even alternate: why do they not work? */
 787                         if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
 788                         dev->alt = i;
 789                         break;
 790                         }
 791         }
 792
 793         if (dev->alt != prev_alt) {
 794                 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
 795                 em2820_coredbg("setting alternate %d with wMaxPacketSize=%u", dev->alt,
 796                        dev->max_pkt_size);
 797                 errCode = usb_set_interface(dev->udev, 0, dev->alt);
 798                 if (errCode < 0) {
 799                         em2820_errdev
 800                                         ("cannot change alternate number to %d (error=%i)\n",
 801                                          dev->alt, errCode);
 802                         return errCode;
 803                 }
 804         }
 805         return 0;
 806 }