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