git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/usbvideo/vicam.c

   1 /*
   2  * USB ViCam WebCam driver
   3  * Copyright (c) 2002 Joe Burks (jburks@wavicle.org),
   4  *                    Christopher L Cheney (ccheney@cheney.cx),
   5  *                    Pavel Machek (pavel@suse.cz),
   6  *                    John Tyner (jtyner@cs.ucr.edu),
   7  *                    Monroe Williams (monroe@pobox.com)
   8  *
   9  * Supports 3COM HomeConnect PC Digital WebCam
  10  * Supports Compro PS39U WebCam
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  *
  26  * This source code is based heavily on the CPiA webcam driver which was
  27  * written by Peter Pregler, Scott J. Bertin and Johannes Erdfelt
  28  *
  29  * Portions of this code were also copied from usbvideo.c
  30  *
  31  * Special thanks to the whole team at Sourceforge for help making
  32  * this driver become a reality.  Notably:
  33  * Andy Armstrong who reverse engineered the color encoding and
  34  * Pavel Machek and Chris Cheney who worked on reverse engineering the
  35  *    camera controls and wrote the first generation driver.
  36  */
  37
  38 #include <linux/kernel.h>
  39 #include <linux/module.h>
  40 #include <linux/init.h>
  41 #include <linux/videodev.h>
  42 #include <linux/usb.h>
  43 #include <linux/vmalloc.h>
  44 #include <linux/mm.h>
  45 #include <linux/slab.h>
  46 #include <linux/mutex.h>
  47 #include <linux/firmware.h>
  48 #include <linux/ihex.h>
  49 #include "usbvideo.h"
  50
  51 // #define VICAM_DEBUG
  52
  53 #ifdef VICAM_DEBUG
  54 #define ADBG(lineno,fmt,args...) printk(fmt, jiffies, __func__, lineno, ##args)
  55 #define DBG(fmt,args...) ADBG((__LINE__),KERN_DEBUG __FILE__"(%ld):%s (%d):"fmt,##args)
  56 #else
  57 #define DBG(fmn,args...) do {} while(0)
  58 #endif
  59
  60 #define DRIVER_AUTHOR           "Joe Burks, jburks@wavicle.org"
  61 #define DRIVER_DESC             "ViCam WebCam Driver"
  62
  63 /* Define these values to match your device */
  64 #define USB_VICAM_VENDOR_ID     0x04c1
  65 #define USB_VICAM_PRODUCT_ID    0x009d
  66 #define USB_COMPRO_VENDOR_ID    0x0602
  67 #define USB_COMPRO_PRODUCT_ID   0x1001
  68
  69 #define VICAM_BYTES_PER_PIXEL   3
  70 #define VICAM_MAX_READ_SIZE     (512*242+128)
  71 #define VICAM_MAX_FRAME_SIZE    (VICAM_BYTES_PER_PIXEL*320*240)
  72 #define VICAM_FRAMES            2
  73
  74 #define VICAM_HEADER_SIZE       64
  75
  76 /* rvmalloc / rvfree copied from usbvideo.c
  77  *
  78  * Not sure why these are not yet non-statics which I can reference through
  79  * usbvideo.h the same as it is in 2.4.20.  I bet this will get fixed sometime
  80  * in the future.
  81  *
  82 */
  83 static void *rvmalloc(unsigned long size)
  84 {
  85         void *mem;
  86         unsigned long adr;
  87
  88         size = PAGE_ALIGN(size);
  89         mem = vmalloc_32(size);
  90         if (!mem)
  91                 return NULL;
  92
  93         memset(mem, 0, size); /* Clear the ram out, no junk to the user */
  94         adr = (unsigned long) mem;
  95         while (size > 0) {
  96                 SetPageReserved(vmalloc_to_page((void *)adr));
  97                 adr += PAGE_SIZE;
  98                 size -= PAGE_SIZE;
  99         }
 100
 101         return mem;
 102 }
 103
 104 static void rvfree(void *mem, unsigned long size)
 105 {
 106         unsigned long adr;
 107
 108         if (!mem)
 109                 return;
 110
 111         adr = (unsigned long) mem;
 112         while ((long) size > 0) {
 113                 ClearPageReserved(vmalloc_to_page((void *)adr));
 114                 adr += PAGE_SIZE;
 115                 size -= PAGE_SIZE;
 116         }
 117         vfree(mem);
 118 }
 119
 120 struct vicam_camera {
 121         u16 shutter_speed;      // capture shutter speed
 122         u16 gain;               // capture gain
 123
 124         u8 *raw_image;          // raw data captured from the camera
 125         u8 *framebuf;           // processed data in RGB24 format
 126         u8 *cntrlbuf;           // area used to send control msgs
 127
 128         struct video_device vdev;       // v4l video device
 129         struct usb_device *udev;        // usb device
 130
 131         /* guard against simultaneous accesses to the camera */
 132         struct mutex cam_lock;
 133
 134         int is_initialized;
 135         u8 open_count;
 136         u8 bulkEndpoint;
 137         int needsDummyRead;
 138 };
 139
 140 static int vicam_probe( struct usb_interface *intf, const struct usb_device_id *id);
 141 static void vicam_disconnect(struct usb_interface *intf);
 142 static void read_frame(struct vicam_camera *cam, int framenum);
 143 static void vicam_decode_color(const u8 *, u8 *);
 144
 145 static int __send_control_msg(struct vicam_camera *cam,
 146                               u8 request,
 147                               u16 value,
 148                               u16 index,
 149                               unsigned char *cp,
 150                               u16 size)
 151 {
 152         int status;
 153
 154         /* cp must be memory that has been allocated by kmalloc */
 155
 156         status = usb_control_msg(cam->udev,
 157                                  usb_sndctrlpipe(cam->udev, 0),
 158                                  request,
 159                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 160                                  USB_RECIP_DEVICE, value, index,
 161                                  cp, size, 1000);
 162
 163         status = min(status, 0);
 164
 165         if (status < 0) {
 166                 printk(KERN_INFO "Failed sending control message, error %d.\n",
 167                        status);
 168         }
 169
 170         return status;
 171 }
 172
 173 static int send_control_msg(struct vicam_camera *cam,
 174                             u8 request,
 175                             u16 value,
 176                             u16 index,
 177                             unsigned char *cp,
 178                             u16 size)
 179 {
 180         int status = -ENODEV;
 181         mutex_lock(&cam->cam_lock);
 182         if (cam->udev) {
 183                 status = __send_control_msg(cam, request, value,
 184                                             index, cp, size);
 185         }
 186         mutex_unlock(&cam->cam_lock);
 187         return status;
 188 }
 189 static int
 190 initialize_camera(struct vicam_camera *cam)
 191 {
 192         int err;
 193         const struct ihex_binrec *rec;
 194         const struct firmware *fw;
 195
 196         err = request_ihex_firmware(&fw, "vicam/firmware.fw", &cam->udev->dev);
 197         if (err) {
 198                 printk(KERN_ERR "Failed to load \"vicam/firmware.fw\": %d\n",
 199                        err);
 200                 return err;
 201         }
 202
 203         for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
 204                 memcpy(cam->cntrlbuf, rec->data, be16_to_cpu(rec->len));
 205
 206                 err = send_control_msg(cam, 0xff, 0, 0,
 207                                        cam->cntrlbuf, be16_to_cpu(rec->len));
 208                 if (err)
 209                         break;
 210         }
 211
 212         release_firmware(fw);
 213
 214         return err;
 215 }
 216
 217 static int
 218 set_camera_power(struct vicam_camera *cam, int state)
 219 {
 220         int status;
 221
 222         if ((status = send_control_msg(cam, 0x50, state, 0, NULL, 0)) < 0)
 223                 return status;
 224
 225         if (state) {
 226                 send_control_msg(cam, 0x55, 1, 0, NULL, 0);
 227         }
 228
 229         return 0;
 230 }
 231
 232 static long
 233 vicam_ioctl(struct file *file, unsigned int ioctlnr, unsigned long arg)
 234 {
 235         void __user *user_arg = (void __user *)arg;
 236         struct vicam_camera *cam = file->private_data;
 237         long retval = 0;
 238
 239         if (!cam)
 240                 return -ENODEV;
 241
 242         switch (ioctlnr) {
 243                 /* query capabilities */
 244         case VIDIOCGCAP:
 245                 {
 246                         struct video_capability b;
 247
 248                         DBG("VIDIOCGCAP\n");
 249                         memset(&b, 0, sizeof(b));
 250                         strcpy(b.name, "ViCam-based Camera");
 251                         b.type = VID_TYPE_CAPTURE;
 252                         b.channels = 1;
 253                         b.audios = 0;
 254                         b.maxwidth = 320;       /* VIDEOSIZE_CIF */
 255                         b.maxheight = 240;
 256                         b.minwidth = 320;       /* VIDEOSIZE_48_48 */
 257                         b.minheight = 240;
 258
 259                         if (copy_to_user(user_arg, &b, sizeof(b)))
 260                                 retval = -EFAULT;
 261
 262                         break;
 263                 }
 264                 /* get/set video source - we are a camera and nothing else */
 265         case VIDIOCGCHAN:
 266                 {
 267                         struct video_channel v;
 268
 269                         DBG("VIDIOCGCHAN\n");
 270                         if (copy_from_user(&v, user_arg, sizeof(v))) {
 271                                 retval = -EFAULT;
 272                                 break;
 273                         }
 274                         if (v.channel != 0) {
 275                                 retval = -EINVAL;
 276                                 break;
 277                         }
 278
 279                         v.channel = 0;
 280                         strcpy(v.name, "Camera");
 281                         v.tuners = 0;
 282                         v.flags = 0;
 283                         v.type = VIDEO_TYPE_CAMERA;
 284                         v.norm = 0;
 285
 286                         if (copy_to_user(user_arg, &v, sizeof(v)))
 287                                 retval = -EFAULT;
 288                         break;
 289                 }
 290
 291         case VIDIOCSCHAN:
 292                 {
 293                         int v;
 294
 295                         if (copy_from_user(&v, user_arg, sizeof(v)))
 296                                 retval = -EFAULT;
 297                         DBG("VIDIOCSCHAN %d\n", v);
 298
 299                         if (retval == 0 && v != 0)
 300                                 retval = -EINVAL;
 301
 302                         break;
 303                 }
 304
 305                 /* image properties */
 306         case VIDIOCGPICT:
 307                 {
 308                         struct video_picture vp;
 309                         DBG("VIDIOCGPICT\n");
 310                         memset(&vp, 0, sizeof (struct video_picture));
 311                         vp.brightness = cam->gain << 8;
 312                         vp.depth = 24;
 313                         vp.palette = VIDEO_PALETTE_RGB24;
 314                         if (copy_to_user(user_arg, &vp, sizeof (struct video_picture)))
 315                                 retval = -EFAULT;
 316                         break;
 317                 }
 318
 319         case VIDIOCSPICT:
 320                 {
 321                         struct video_picture vp;
 322
 323                         if (copy_from_user(&vp, user_arg, sizeof(vp))) {
 324                                 retval = -EFAULT;
 325                                 break;
 326                         }
 327
 328                         DBG("VIDIOCSPICT depth = %d, pal = %d\n", vp.depth,
 329                             vp.palette);
 330
 331                         cam->gain = vp.brightness >> 8;
 332
 333                         if (vp.depth != 24
 334                             || vp.palette != VIDEO_PALETTE_RGB24)
 335                                 retval = -EINVAL;
 336
 337                         break;
 338                 }
 339
 340                 /* get/set capture window */
 341         case VIDIOCGWIN:
 342                 {
 343                         struct video_window vw;
 344                         vw.x = 0;
 345                         vw.y = 0;
 346                         vw.width = 320;
 347                         vw.height = 240;
 348                         vw.chromakey = 0;
 349                         vw.flags = 0;
 350                         vw.clips = NULL;
 351                         vw.clipcount = 0;
 352
 353                         DBG("VIDIOCGWIN\n");
 354
 355                         if (copy_to_user(user_arg, (void *)&vw, sizeof(vw)))
 356                                 retval = -EFAULT;
 357
 358                         // I'm not sure what the deal with a capture window is, it is very poorly described
 359                         // in the doc.  So I won't support it now.
 360                         break;
 361                 }
 362
 363         case VIDIOCSWIN:
 364                 {
 365
 366                         struct video_window vw;
 367
 368                         if (copy_from_user(&vw, user_arg, sizeof(vw))) {
 369                                 retval = -EFAULT;
 370                                 break;
 371                         }
 372
 373                         DBG("VIDIOCSWIN %d x %d\n", vw.width, vw.height);
 374
 375                         if ( vw.width != 320 || vw.height != 240 )
 376                                 retval = -EFAULT;
 377
 378                         break;
 379                 }
 380
 381                 /* mmap interface */
 382         case VIDIOCGMBUF:
 383                 {
 384                         struct video_mbuf vm;
 385                         int i;
 386
 387                         DBG("VIDIOCGMBUF\n");
 388                         memset(&vm, 0, sizeof (vm));
 389                         vm.size =
 390                             VICAM_MAX_FRAME_SIZE * VICAM_FRAMES;
 391                         vm.frames = VICAM_FRAMES;
 392                         for (i = 0; i < VICAM_FRAMES; i++)
 393                                 vm.offsets[i] = VICAM_MAX_FRAME_SIZE * i;
 394
 395                         if (copy_to_user(user_arg, (void *)&vm, sizeof(vm)))
 396                                 retval = -EFAULT;
 397
 398                         break;
 399                 }
 400
 401         case VIDIOCMCAPTURE:
 402                 {
 403                         struct video_mmap vm;
 404                         // int video_size;
 405
 406                         if (copy_from_user((void *)&vm, user_arg, sizeof(vm))) {
 407                                 retval = -EFAULT;
 408                                 break;
 409                         }
 410
 411                         DBG("VIDIOCMCAPTURE frame=%d, height=%d, width=%d, format=%d.\n",vm.frame,vm.width,vm.height,vm.format);
 412
 413                         if ( vm.frame >= VICAM_FRAMES || vm.format != VIDEO_PALETTE_RGB24 )
 414                                 retval = -EINVAL;
 415
 416                         // in theory right here we'd start the image capturing
 417                         // (fill in a bulk urb and submit it asynchronously)
 418                         //
 419                         // Instead we're going to do a total hack job for now and
 420                         // retrieve the frame in VIDIOCSYNC
 421
 422                         break;
 423                 }
 424
 425         case VIDIOCSYNC:
 426                 {
 427                         int frame;
 428
 429                         if (copy_from_user((void *)&frame, user_arg, sizeof(int))) {
 430                                 retval = -EFAULT;
 431                                 break;
 432                         }
 433                         DBG("VIDIOCSYNC: %d\n", frame);
 434
 435                         read_frame(cam, frame);
 436                         vicam_decode_color(cam->raw_image,
 437                                            cam->framebuf +
 438                                            frame * VICAM_MAX_FRAME_SIZE );
 439
 440                         break;
 441                 }
 442
 443                 /* pointless to implement overlay with this camera */
 444         case VIDIOCCAPTURE:
 445         case VIDIOCGFBUF:
 446         case VIDIOCSFBUF:
 447         case VIDIOCKEY:
 448                 retval = -EINVAL;
 449                 break;
 450
 451                 /* tuner interface - we have none */
 452         case VIDIOCGTUNER:
 453         case VIDIOCSTUNER:
 454         case VIDIOCGFREQ:
 455         case VIDIOCSFREQ:
 456                 retval = -EINVAL;
 457                 break;
 458
 459                 /* audio interface - we have none */
 460         case VIDIOCGAUDIO:
 461         case VIDIOCSAUDIO:
 462                 retval = -EINVAL;
 463                 break;
 464         default:
 465                 retval = -ENOIOCTLCMD;
 466                 break;
 467         }
 468
 469         return retval;
 470 }
 471
 472 static int
 473 vicam_open(struct file *file)
 474 {
 475         struct vicam_camera *cam = video_drvdata(file);
 476
 477         DBG("open\n");
 478
 479         if (!cam) {
 480                 printk(KERN_ERR
 481                        "vicam video_device improperly initialized");
 482                 return -EINVAL;
 483         }
 484
 485         /* the videodev_lock held above us protects us from
 486          * simultaneous opens...for now. we probably shouldn't
 487          * rely on this fact forever.
 488          */
 489
 490         lock_kernel();
 491         if (cam->open_count > 0) {
 492                 printk(KERN_INFO
 493                        "vicam_open called on already opened camera");
 494                 unlock_kernel();
 495                 return -EBUSY;
 496         }
 497
 498         cam->raw_image = kmalloc(VICAM_MAX_READ_SIZE, GFP_KERNEL);
 499         if (!cam->raw_image) {
 500                 unlock_kernel();
 501                 return -ENOMEM;
 502         }
 503
 504         cam->framebuf = rvmalloc(VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
 505         if (!cam->framebuf) {
 506                 kfree(cam->raw_image);
 507                 unlock_kernel();
 508                 return -ENOMEM;
 509         }
 510
 511         cam->cntrlbuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 512         if (!cam->cntrlbuf) {
 513                 kfree(cam->raw_image);
 514                 rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
 515                 unlock_kernel();
 516                 return -ENOMEM;
 517         }
 518
 519         // First upload firmware, then turn the camera on
 520
 521         if (!cam->is_initialized) {
 522                 initialize_camera(cam);
 523
 524                 cam->is_initialized = 1;
 525         }
 526
 527         set_camera_power(cam, 1);
 528
 529         cam->needsDummyRead = 1;
 530         cam->open_count++;
 531
 532         file->private_data = cam;
 533         unlock_kernel();
 534
 535         return 0;
 536 }
 537
 538 static int
 539 vicam_close(struct file *file)
 540 {
 541         struct vicam_camera *cam = file->private_data;
 542         int open_count;
 543         struct usb_device *udev;
 544
 545         DBG("close\n");
 546
 547         /* it's not the end of the world if
 548          * we fail to turn the camera off.
 549          */
 550
 551         set_camera_power(cam, 0);
 552
 553         kfree(cam->raw_image);
 554         rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
 555         kfree(cam->cntrlbuf);
 556
 557         mutex_lock(&cam->cam_lock);
 558
 559         cam->open_count--;
 560         open_count = cam->open_count;
 561         udev = cam->udev;
 562
 563         mutex_unlock(&cam->cam_lock);
 564
 565         if (!open_count && !udev) {
 566                 kfree(cam);
 567         }
 568
 569         return 0;
 570 }
 571
 572 static void vicam_decode_color(const u8 *data, u8 *rgb)
 573 {
 574         /* vicam_decode_color - Convert from Vicam Y-Cr-Cb to RGB
 575          * Copyright (C) 2002 Monroe Williams (monroe@pobox.com)
 576          */
 577
 578         int i, prevY, nextY;
 579
 580         prevY = 512;
 581         nextY = 512;
 582
 583         data += VICAM_HEADER_SIZE;
 584
 585         for( i = 0; i < 240; i++, data += 512 ) {
 586                 const int y = ( i * 242 ) / 240;
 587
 588                 int j, prevX, nextX;
 589                 int Y, Cr, Cb;
 590
 591                 if ( y == 242 - 1 ) {
 592                         nextY = -512;
 593                 }
 594
 595                 prevX = 1;
 596                 nextX = 1;
 597
 598                 for ( j = 0; j < 320; j++, rgb += 3 ) {
 599                         const int x = ( j * 512 ) / 320;
 600                         const u8 * const src = &data[x];
 601
 602                         if ( x == 512 - 1 ) {
 603                                 nextX = -1;
 604                         }
 605
 606                         Cr = ( src[prevX] - src[0] ) +
 607                                 ( src[nextX] - src[0] );
 608                         Cr /= 2;
 609
 610                         Cb = ( src[prevY] - src[prevX + prevY] ) +
 611                                 ( src[prevY] - src[nextX + prevY] ) +
 612                                 ( src[nextY] - src[prevX + nextY] ) +
 613                                 ( src[nextY] - src[nextX + nextY] );
 614                         Cb /= 4;
 615
 616                         Y = 1160 * ( src[0] + ( Cr / 2 ) - 16 );
 617
 618                         if ( i & 1 ) {
 619                                 int Ct = Cr;
 620                                 Cr = Cb;
 621                                 Cb = Ct;
 622                         }
 623
 624                         if ( ( x ^ i ) & 1 ) {
 625                                 Cr = -Cr;
 626                                 Cb = -Cb;
 627                         }
 628
 629                         rgb[0] = clamp( ( ( Y + ( 2017 * Cb ) ) +
 630                                         500 ) / 900, 0, 255 );
 631                         rgb[1] = clamp( ( ( Y - ( 392 * Cb ) -
 632                                           ( 813 * Cr ) ) +
 633                                           500 ) / 1000, 0, 255 );
 634                         rgb[2] = clamp( ( ( Y + ( 1594 * Cr ) ) +
 635                                         500 ) / 1300, 0, 255 );
 636
 637                         prevX = -1;
 638                 }
 639
 640                 prevY = -512;
 641         }
 642 }
 643
 644 static void
 645 read_frame(struct vicam_camera *cam, int framenum)
 646 {
 647         unsigned char *request = cam->cntrlbuf;
 648         int realShutter;
 649         int n;
 650         int actual_length;
 651
 652         if (cam->needsDummyRead) {
 653                 cam->needsDummyRead = 0;
 654                 read_frame(cam, framenum);
 655         }
 656
 657         memset(request, 0, 16);
 658         request[0] = cam->gain; // 0 = 0% gain, FF = 100% gain
 659
 660         request[1] = 0; // 512x242 capture
 661
 662         request[2] = 0x90;      // the function of these two bytes
 663         request[3] = 0x07;      // is not yet understood
 664
 665         if (cam->shutter_speed > 60) {
 666                 // Short exposure
 667                 realShutter =
 668                     ((-15631900 / cam->shutter_speed) + 260533) / 1000;
 669                 request[4] = realShutter & 0xFF;
 670                 request[5] = (realShutter >> 8) & 0xFF;
 671                 request[6] = 0x03;
 672                 request[7] = 0x01;
 673         } else {
 674                 // Long exposure
 675                 realShutter = 15600 / cam->shutter_speed - 1;
 676                 request[4] = 0;
 677                 request[5] = 0;
 678                 request[6] = realShutter & 0xFF;
 679                 request[7] = realShutter >> 8;
 680         }
 681
 682         // Per John Markus Bjørndalen, byte at index 8 causes problems if it isn't 0
 683         request[8] = 0;
 684         // bytes 9-15 do not seem to affect exposure or image quality
 685
 686         mutex_lock(&cam->cam_lock);
 687
 688         if (!cam->udev) {
 689                 goto done;
 690         }
 691
 692         n = __send_control_msg(cam, 0x51, 0x80, 0, request, 16);
 693
 694         if (n < 0) {
 695                 printk(KERN_ERR
 696                        " Problem sending frame capture control message");
 697                 goto done;
 698         }
 699
 700         n = usb_bulk_msg(cam->udev,
 701                          usb_rcvbulkpipe(cam->udev, cam->bulkEndpoint),
 702                          cam->raw_image,
 703                          512 * 242 + 128, &actual_length, 10000);
 704
 705         if (n < 0) {
 706                 printk(KERN_ERR "Problem during bulk read of frame data: %d\n",
 707                        n);
 708         }
 709
 710  done:
 711         mutex_unlock(&cam->cam_lock);
 712 }
 713
 714 static ssize_t
 715 vicam_read( struct file *file, char __user *buf, size_t count, loff_t *ppos )
 716 {
 717         struct vicam_camera *cam = file->private_data;
 718
 719         DBG("read %d bytes.\n", (int) count);
 720
 721         if (*ppos >= VICAM_MAX_FRAME_SIZE) {
 722                 *ppos = 0;
 723                 return 0;
 724         }
 725
 726         if (*ppos == 0) {
 727                 read_frame(cam, 0);
 728                 vicam_decode_color(cam->raw_image,
 729                                    cam->framebuf +
 730                                    0 * VICAM_MAX_FRAME_SIZE);
 731         }
 732
 733         count = min_t(size_t, count, VICAM_MAX_FRAME_SIZE - *ppos);
 734
 735         if (copy_to_user(buf, &cam->framebuf[*ppos], count)) {
 736                 count = -EFAULT;
 737         } else {
 738                 *ppos += count;
 739         }
 740
 741         if (count == VICAM_MAX_FRAME_SIZE) {
 742                 *ppos = 0;
 743         }
 744
 745         return count;
 746 }
 747
 748
 749 static int
 750 vicam_mmap(struct file *file, struct vm_area_struct *vma)
 751 {
 752         // TODO: allocate the raw frame buffer if necessary
 753         unsigned long page, pos;
 754         unsigned long start = vma->vm_start;
 755         unsigned long size  = vma->vm_end-vma->vm_start;
 756         struct vicam_camera *cam = file->private_data;
 757
 758         if (!cam)
 759                 return -ENODEV;
 760
 761         DBG("vicam_mmap: %ld\n", size);
 762
 763         /* We let mmap allocate as much as it wants because Linux was adding 2048 bytes
 764          * to the size the application requested for mmap and it was screwing apps up.
 765          if (size > VICAM_FRAMES*VICAM_MAX_FRAME_SIZE)
 766          return -EINVAL;
 767          */
 768
 769         pos = (unsigned long)cam->framebuf;
 770         while (size > 0) {
 771                 page = vmalloc_to_pfn((void *)pos);
 772                 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
 773                         return -EAGAIN;
 774
 775                 start += PAGE_SIZE;
 776                 pos += PAGE_SIZE;
 777                 if (size > PAGE_SIZE)
 778                         size -= PAGE_SIZE;
 779                 else
 780                         size = 0;
 781         }
 782
 783         return 0;
 784 }
 785
 786 static const struct v4l2_file_operations vicam_fops = {
 787         .owner          = THIS_MODULE,
 788         .open           = vicam_open,
 789         .release        = vicam_close,
 790         .read           = vicam_read,
 791         .mmap           = vicam_mmap,
 792         .ioctl          = vicam_ioctl,
 793 };
 794
 795 static struct video_device vicam_template = {
 796         .name           = "ViCam-based USB Camera",
 797         .fops           = &vicam_fops,
 798         .minor          = -1,
 799         .release        = video_device_release_empty,
 800 };
 801
 802 /* table of devices that work with this driver */
 803 static struct usb_device_id vicam_table[] = {
 804         {USB_DEVICE(USB_VICAM_VENDOR_ID, USB_VICAM_PRODUCT_ID)},
 805         {USB_DEVICE(USB_COMPRO_VENDOR_ID, USB_COMPRO_PRODUCT_ID)},
 806         {}                      /* Terminating entry */
 807 };
 808
 809 MODULE_DEVICE_TABLE(usb, vicam_table);
 810
 811 static struct usb_driver vicam_driver = {
 812         .name           = "vicam",
 813         .probe          = vicam_probe,
 814         .disconnect     = vicam_disconnect,
 815         .id_table       = vicam_table
 816 };
 817
 818 /**
 819  *      vicam_probe
 820  *      @intf: the interface
 821  *      @id: the device id
 822  *
 823  *      Called by the usb core when a new device is connected that it thinks
 824  *      this driver might be interested in.
 825  */
 826 static int
 827 vicam_probe( struct usb_interface *intf, const struct usb_device_id *id)
 828 {
 829         struct usb_device *dev = interface_to_usbdev(intf);
 830         int bulkEndpoint = 0;
 831         const struct usb_host_interface *interface;
 832         const struct usb_endpoint_descriptor *endpoint;
 833         struct vicam_camera *cam;
 834
 835         printk(KERN_INFO "ViCam based webcam connected\n");
 836
 837         interface = intf->cur_altsetting;
 838
 839         DBG(KERN_DEBUG "Interface %d. has %u. endpoints!\n",
 840                interface->desc.bInterfaceNumber, (unsigned) (interface->desc.bNumEndpoints));
 841         endpoint = &interface->endpoint[0].desc;
 842
 843         if (usb_endpoint_is_bulk_in(endpoint)) {
 844                 /* we found a bulk in endpoint */
 845                 bulkEndpoint = endpoint->bEndpointAddress;
 846         } else {
 847                 printk(KERN_ERR
 848                        "No bulk in endpoint was found ?! (this is bad)\n");
 849         }
 850
 851         if ((cam =
 852              kzalloc(sizeof (struct vicam_camera), GFP_KERNEL)) == NULL) {
 853                 printk(KERN_WARNING
 854                        "could not allocate kernel memory for vicam_camera struct\n");
 855                 return -ENOMEM;
 856         }
 857
 858
 859         cam->shutter_speed = 15;
 860
 861         mutex_init(&cam->cam_lock);
 862
 863         memcpy(&cam->vdev, &vicam_template, sizeof(vicam_template));
 864         video_set_drvdata(&cam->vdev, cam);
 865
 866         cam->udev = dev;
 867         cam->bulkEndpoint = bulkEndpoint;
 868
 869         if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1) < 0) {
 870                 kfree(cam);
 871                 printk(KERN_WARNING "video_register_device failed\n");
 872                 return -EIO;
 873         }
 874
 875         printk(KERN_INFO "ViCam webcam driver now controlling video device %d\n",
 876                         cam->vdev.num);
 877
 878         usb_set_intfdata (intf, cam);
 879
 880         return 0;
 881 }
 882
 883 static void
 884 vicam_disconnect(struct usb_interface *intf)
 885 {
 886         int open_count;
 887         struct vicam_camera *cam = usb_get_intfdata (intf);
 888         usb_set_intfdata (intf, NULL);
 889
 890         /* we must unregister the device before taking its
 891          * cam_lock. This is because the video open call
 892          * holds the same lock as video unregister. if we
 893          * unregister inside of the cam_lock and open also
 894          * uses the cam_lock, we get deadlock.
 895          */
 896
 897         video_unregister_device(&cam->vdev);
 898
 899         /* stop the camera from being used */
 900
 901         mutex_lock(&cam->cam_lock);
 902
 903         /* mark the camera as gone */
 904
 905         cam->udev = NULL;
 906
 907         /* the only thing left to do is synchronize with
 908          * our close/release function on who should release
 909          * the camera memory. if there are any users using the
 910          * camera, it's their job. if there are no users,
 911          * it's ours.
 912          */
 913
 914         open_count = cam->open_count;
 915
 916         mutex_unlock(&cam->cam_lock);
 917
 918         if (!open_count) {
 919                 kfree(cam);
 920         }
 921
 922         printk(KERN_DEBUG "ViCam-based WebCam disconnected\n");
 923 }
 924
 925 /*
 926  */
 927 static int __init
 928 usb_vicam_init(void)
 929 {
 930         int retval;
 931         DBG(KERN_INFO "ViCam-based WebCam driver startup\n");
 932         retval = usb_register(&vicam_driver);
 933         if (retval)
 934                 printk(KERN_WARNING "usb_register failed!\n");
 935         return retval;
 936 }
 937
 938 static void __exit
 939 usb_vicam_exit(void)
 940 {
 941         DBG(KERN_INFO
 942                "ViCam-based WebCam driver shutdown\n");
 943
 944         usb_deregister(&vicam_driver);
 945 }
 946
 947 module_init(usb_vicam_init);
 948 module_exit(usb_vicam_exit);
 949
 950 MODULE_AUTHOR(DRIVER_AUTHOR);
 951 MODULE_DESCRIPTION(DRIVER_DESC);
 952 MODULE_LICENSE("GPL");
 953 MODULE_FIRMWARE("vicam/firmware.fw");