SAFE public projects git trees. - safe/jmp/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/slab.h>
  45 #include <linux/mutex.h>
  46 #include <linux/firmware.h>
  47 #include <linux/ihex.h>
  48 #include "usbvideo.h"
  49
  50 // #define VICAM_DEBUG
  51
  52 #ifdef VICAM_DEBUG
  53 #define ADBG(lineno,fmt,args...) printk(fmt, jiffies, __func__, lineno, ##args)
  54 #define DBG(fmt,args...) ADBG((__LINE__),KERN_DEBUG __FILE__"(%ld):%s (%d):"fmt,##args)
  55 #else
  56 #define DBG(fmn,args...) do {} while(0)
  57 #endif
  58
  59 #define DRIVER_AUTHOR           "Joe Burks, jburks@wavicle.org"
  60 #define DRIVER_DESC             "ViCam WebCam Driver"
  61
  62 /* Define these values to match your device */
  63 #define USB_VICAM_VENDOR_ID     0x04c1
  64 #define USB_VICAM_PRODUCT_ID    0x009d
  65 #define USB_COMPRO_VENDOR_ID    0x0602
  66 #define USB_COMPRO_PRODUCT_ID   0x1001
  67
  68 #define VICAM_BYTES_PER_PIXEL   3
  69 #define VICAM_MAX_READ_SIZE     (512*242+128)
  70 #define VICAM_MAX_FRAME_SIZE    (VICAM_BYTES_PER_PIXEL*320*240)
  71 #define VICAM_FRAMES            2
  72
  73 #define VICAM_HEADER_SIZE       64
  74
  75 /* rvmalloc / rvfree copied from usbvideo.c
  76  *
  77  * Not sure why these are not yet non-statics which I can reference through
  78  * usbvideo.h the same as it is in 2.4.20.  I bet this will get fixed sometime
  79  * in the future.
  80  *
  81 */
  82 static void *rvmalloc(unsigned long size)
  83 {
  84         void *mem;
  85         unsigned long adr;
  86
  87         size = PAGE_ALIGN(size);
  88         mem = vmalloc_32(size);
  89         if (!mem)
  90                 return NULL;
  91
  92         memset(mem, 0, size); /* Clear the ram out, no junk to the user */
  93         adr = (unsigned long) mem;
  94         while (size > 0) {
  95                 SetPageReserved(vmalloc_to_page((void *)adr));
  96                 adr += PAGE_SIZE;
  97                 size -= PAGE_SIZE;
  98         }
  99
 100         return mem;
 101 }
 102
 103 static void rvfree(void *mem, unsigned long size)
 104 {
 105         unsigned long adr;
 106
 107         if (!mem)
 108                 return;
 109
 110         adr = (unsigned long) mem;
 111         while ((long) size > 0) {
 112                 ClearPageReserved(vmalloc_to_page((void *)adr));
 113                 adr += PAGE_SIZE;
 114                 size -= PAGE_SIZE;
 115         }
 116         vfree(mem);
 117 }
 118
 119 struct vicam_camera {
 120         u16 shutter_speed;      // capture shutter speed
 121         u16 gain;               // capture gain
 122
 123         u8 *raw_image;          // raw data captured from the camera
 124         u8 *framebuf;           // processed data in RGB24 format
 125         u8 *cntrlbuf;           // area used to send control msgs
 126
 127         struct video_device vdev;       // v4l video device
 128         struct usb_device *udev;        // usb device
 129
 130         /* guard against simultaneous accesses to the camera */
 131         struct mutex cam_lock;
 132
 133         int is_initialized;
 134         u8 open_count;
 135         u8 bulkEndpoint;
 136         int needsDummyRead;
 137 };
 138
 139 static int vicam_probe( struct usb_interface *intf, const struct usb_device_id *id);
 140 static void vicam_disconnect(struct usb_interface *intf);
 141 static void read_frame(struct vicam_camera *cam, int framenum);
 142 static void vicam_decode_color(const u8 *, u8 *);
 143
 144 static int __send_control_msg(struct vicam_camera *cam,
 145                               u8 request,
 146                               u16 value,
 147                               u16 index,
 148                               unsigned char *cp,
 149                               u16 size)
 150 {
 151         int status;
 152
 153         /* cp must be memory that has been allocated by kmalloc */
 154
 155         status = usb_control_msg(cam->udev,
 156                                  usb_sndctrlpipe(cam->udev, 0),
 157                                  request,
 158                                  USB_DIR_OUT | USB_TYPE_VENDOR |
 159                                  USB_RECIP_DEVICE, value, index,
 160                                  cp, size, 1000);
 161
 162         status = min(status, 0);
 163
 164         if (status < 0) {
 165                 printk(KERN_INFO "Failed sending control message, error %d.\n",
 166                        status);
 167         }
 168
 169         return status;
 170 }
 171
 172 static int send_control_msg(struct vicam_camera *cam,
 173                             u8 request,
 174                             u16 value,
 175                             u16 index,
 176                             unsigned char *cp,
 177                             u16 size)
 178 {
 179         int status = -ENODEV;
 180         mutex_lock(&cam->cam_lock);
 181         if (cam->udev) {
 182                 status = __send_control_msg(cam, request, value,
 183                                             index, cp, size);
 184         }
 185         mutex_unlock(&cam->cam_lock);
 186         return status;
 187 }
 188 static int
 189 initialize_camera(struct vicam_camera *cam)
 190 {
 191         int err;
 192         const struct ihex_binrec *rec;
 193         const struct firmware *fw;
 194
 195         err = request_ihex_firmware(&fw, "vicam/firmware.fw", &cam->udev->dev);
 196         if (err) {
 197                 printk(KERN_ERR "Failed to load \"vicam/firmware.fw\": %d\n",
 198                        err);
 199                 return err;
 200         }
 201
 202         for (rec = (void *)fw->data; rec; rec = ihex_next_binrec(rec)) {
 203                 memcpy(cam->cntrlbuf, rec->data, be16_to_cpu(rec->len));
 204
 205                 err = send_control_msg(cam, 0xff, 0, 0,
 206                                        cam->cntrlbuf, be16_to_cpu(rec->len));
 207                 if (err)
 208                         break;
 209         }
 210
 211         release_firmware(fw);
 212
 213         return err;
 214 }
 215
 216 static int
 217 set_camera_power(struct vicam_camera *cam, int state)
 218 {
 219         int status;
 220
 221         if ((status = send_control_msg(cam, 0x50, state, 0, NULL, 0)) < 0)
 222                 return status;
 223
 224         if (state) {
 225                 send_control_msg(cam, 0x55, 1, 0, NULL, 0);
 226         }
 227
 228         return 0;
 229 }
 230
 231 static int
 232 vicam_ioctl(struct inode *inode, struct file *file, unsigned int ioctlnr, unsigned long arg)
 233 {
 234         void __user *user_arg = (void __user *)arg;
 235         struct vicam_camera *cam = file->private_data;
 236         int retval = 0;
 237
 238         if (!cam)
 239                 return -ENODEV;
 240
 241         switch (ioctlnr) {
 242                 /* query capabilities */
 243         case VIDIOCGCAP:
 244                 {
 245                         struct video_capability b;
 246
 247                         DBG("VIDIOCGCAP\n");
 248                         memset(&b, 0, sizeof(b));
 249                         strcpy(b.name, "ViCam-based Camera");
 250                         b.type = VID_TYPE_CAPTURE;
 251                         b.channels = 1;
 252                         b.audios = 0;
 253                         b.maxwidth = 320;       /* VIDEOSIZE_CIF */
 254                         b.maxheight = 240;
 255                         b.minwidth = 320;       /* VIDEOSIZE_48_48 */
 256                         b.minheight = 240;
 257
 258                         if (copy_to_user(user_arg, &b, sizeof(b)))
 259                                 retval = -EFAULT;
 260
 261                         break;
 262                 }
 263                 /* get/set video source - we are a camera and nothing else */
 264         case VIDIOCGCHAN:
 265                 {
 266                         struct video_channel v;
 267
 268                         DBG("VIDIOCGCHAN\n");
 269                         if (copy_from_user(&v, user_arg, sizeof(v))) {
 270                                 retval = -EFAULT;
 271                                 break;
 272                         }
 273                         if (v.channel != 0) {
 274                                 retval = -EINVAL;
 275                                 break;
 276                         }
 277
 278                         v.channel = 0;
 279                         strcpy(v.name, "Camera");
 280                         v.tuners = 0;
 281                         v.flags = 0;
 282                         v.type = VIDEO_TYPE_CAMERA;
 283                         v.norm = 0;
 284
 285                         if (copy_to_user(user_arg, &v, sizeof(v)))
 286                                 retval = -EFAULT;
 287                         break;
 288                 }
 289
 290         case VIDIOCSCHAN:
 291                 {
 292                         int v;
 293
 294                         if (copy_from_user(&v, user_arg, sizeof(v)))
 295                                 retval = -EFAULT;
 296                         DBG("VIDIOCSCHAN %d\n", v);
 297
 298                         if (retval == 0 && v != 0)
 299                                 retval = -EINVAL;
 300
 301                         break;
 302                 }
 303
 304                 /* image properties */
 305         case VIDIOCGPICT:
 306                 {
 307                         struct video_picture vp;
 308                         DBG("VIDIOCGPICT\n");
 309                         memset(&vp, 0, sizeof (struct video_picture));
 310                         vp.brightness = cam->gain << 8;
 311                         vp.depth = 24;
 312                         vp.palette = VIDEO_PALETTE_RGB24;
 313                         if (copy_to_user(user_arg, &vp, sizeof (struct video_picture)))
 314                                 retval = -EFAULT;
 315                         break;
 316                 }
 317
 318         case VIDIOCSPICT:
 319                 {
 320                         struct video_picture vp;
 321
 322                         if (copy_from_user(&vp, user_arg, sizeof(vp))) {
 323                                 retval = -EFAULT;
 324                                 break;
 325                         }
 326
 327                         DBG("VIDIOCSPICT depth = %d, pal = %d\n", vp.depth,
 328                             vp.palette);
 329
 330                         cam->gain = vp.brightness >> 8;
 331
 332                         if (vp.depth != 24
 333                             || vp.palette != VIDEO_PALETTE_RGB24)
 334                                 retval = -EINVAL;
 335
 336                         break;
 337                 }
 338
 339                 /* get/set capture window */
 340         case VIDIOCGWIN:
 341                 {
 342                         struct video_window vw;
 343                         vw.x = 0;
 344                         vw.y = 0;
 345                         vw.width = 320;
 346                         vw.height = 240;
 347                         vw.chromakey = 0;
 348                         vw.flags = 0;
 349                         vw.clips = NULL;
 350                         vw.clipcount = 0;
 351
 352                         DBG("VIDIOCGWIN\n");
 353
 354                         if (copy_to_user(user_arg, (void *)&vw, sizeof(vw)))
 355                                 retval = -EFAULT;
 356
 357                         // I'm not sure what the deal with a capture window is, it is very poorly described
 358                         // in the doc.  So I won't support it now.
 359                         break;
 360                 }
 361
 362         case VIDIOCSWIN:
 363                 {
 364
 365                         struct video_window vw;
 366
 367                         if (copy_from_user(&vw, user_arg, sizeof(vw))) {
 368                                 retval = -EFAULT;
 369                                 break;
 370                         }
 371
 372                         DBG("VIDIOCSWIN %d x %d\n", vw.width, vw.height);
 373
 374                         if ( vw.width != 320 || vw.height != 240 )
 375                                 retval = -EFAULT;
 376
 377                         break;
 378                 }
 379
 380                 /* mmap interface */
 381         case VIDIOCGMBUF:
 382                 {
 383                         struct video_mbuf vm;
 384                         int i;
 385
 386                         DBG("VIDIOCGMBUF\n");
 387                         memset(&vm, 0, sizeof (vm));
 388                         vm.size =
 389                             VICAM_MAX_FRAME_SIZE * VICAM_FRAMES;
 390                         vm.frames = VICAM_FRAMES;
 391                         for (i = 0; i < VICAM_FRAMES; i++)
 392                                 vm.offsets[i] = VICAM_MAX_FRAME_SIZE * i;
 393
 394                         if (copy_to_user(user_arg, (void *)&vm, sizeof(vm)))
 395                                 retval = -EFAULT;
 396
 397                         break;
 398                 }
 399
 400         case VIDIOCMCAPTURE:
 401                 {
 402                         struct video_mmap vm;
 403                         // int video_size;
 404
 405                         if (copy_from_user((void *)&vm, user_arg, sizeof(vm))) {
 406                                 retval = -EFAULT;
 407                                 break;
 408                         }
 409
 410                         DBG("VIDIOCMCAPTURE frame=%d, height=%d, width=%d, format=%d.\n",vm.frame,vm.width,vm.height,vm.format);
 411
 412                         if ( vm.frame >= VICAM_FRAMES || vm.format != VIDEO_PALETTE_RGB24 )
 413                                 retval = -EINVAL;
 414
 415                         // in theory right here we'd start the image capturing
 416                         // (fill in a bulk urb and submit it asynchronously)
 417                         //
 418                         // Instead we're going to do a total hack job for now and
 419                         // retrieve the frame in VIDIOCSYNC
 420
 421                         break;
 422                 }
 423
 424         case VIDIOCSYNC:
 425                 {
 426                         int frame;
 427
 428                         if (copy_from_user((void *)&frame, user_arg, sizeof(int))) {
 429                                 retval = -EFAULT;
 430                                 break;
 431                         }
 432                         DBG("VIDIOCSYNC: %d\n", frame);
 433
 434                         read_frame(cam, frame);
 435                         vicam_decode_color(cam->raw_image,
 436                                            cam->framebuf +
 437                                            frame * VICAM_MAX_FRAME_SIZE );
 438
 439                         break;
 440                 }
 441
 442                 /* pointless to implement overlay with this camera */
 443         case VIDIOCCAPTURE:
 444         case VIDIOCGFBUF:
 445         case VIDIOCSFBUF:
 446         case VIDIOCKEY:
 447                 retval = -EINVAL;
 448                 break;
 449
 450                 /* tuner interface - we have none */
 451         case VIDIOCGTUNER:
 452         case VIDIOCSTUNER:
 453         case VIDIOCGFREQ:
 454         case VIDIOCSFREQ:
 455                 retval = -EINVAL;
 456                 break;
 457
 458                 /* audio interface - we have none */
 459         case VIDIOCGAUDIO:
 460         case VIDIOCSAUDIO:
 461                 retval = -EINVAL;
 462                 break;
 463         default:
 464                 retval = -ENOIOCTLCMD;
 465                 break;
 466         }
 467
 468         return retval;
 469 }
 470
 471 static int
 472 vicam_open(struct inode *inode, struct file *file)
 473 {
 474         struct video_device *dev = video_devdata(file);
 475         struct vicam_camera *cam =
 476             (struct vicam_camera *) dev->priv;
 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         if (cam->open_count > 0) {
 491                 printk(KERN_INFO
 492                        "vicam_open called on already opened camera");
 493                 return -EBUSY;
 494         }
 495
 496         cam->raw_image = kmalloc(VICAM_MAX_READ_SIZE, GFP_KERNEL);
 497         if (!cam->raw_image) {
 498                 return -ENOMEM;
 499         }
 500
 501         cam->framebuf = rvmalloc(VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
 502         if (!cam->framebuf) {
 503                 kfree(cam->raw_image);
 504                 return -ENOMEM;
 505         }
 506
 507         cam->cntrlbuf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 508         if (!cam->cntrlbuf) {
 509                 kfree(cam->raw_image);
 510                 rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
 511                 return -ENOMEM;
 512         }
 513
 514         // First upload firmware, then turn the camera on
 515
 516         if (!cam->is_initialized) {
 517                 initialize_camera(cam);
 518
 519                 cam->is_initialized = 1;
 520         }
 521
 522         set_camera_power(cam, 1);
 523
 524         cam->needsDummyRead = 1;
 525         cam->open_count++;
 526
 527         file->private_data = cam;
 528
 529         return 0;
 530 }
 531
 532 static int
 533 vicam_close(struct inode *inode, struct file *file)
 534 {
 535         struct vicam_camera *cam = file->private_data;
 536         int open_count;
 537         struct usb_device *udev;
 538
 539         DBG("close\n");
 540
 541         /* it's not the end of the world if
 542          * we fail to turn the camera off.
 543          */
 544
 545         set_camera_power(cam, 0);
 546
 547         kfree(cam->raw_image);
 548         rvfree(cam->framebuf, VICAM_MAX_FRAME_SIZE * VICAM_FRAMES);
 549         kfree(cam->cntrlbuf);
 550
 551         mutex_lock(&cam->cam_lock);
 552
 553         cam->open_count--;
 554         open_count = cam->open_count;
 555         udev = cam->udev;
 556
 557         mutex_unlock(&cam->cam_lock);
 558
 559         if (!open_count && !udev) {
 560                 kfree(cam);
 561         }
 562
 563         return 0;
 564 }
 565
 566 static void vicam_decode_color(const u8 *data, u8 *rgb)
 567 {
 568         /* vicam_decode_color - Convert from Vicam Y-Cr-Cb to RGB
 569          * Copyright (C) 2002 Monroe Williams (monroe@pobox.com)
 570          */
 571
 572         int i, prevY, nextY;
 573
 574         prevY = 512;
 575         nextY = 512;
 576
 577         data += VICAM_HEADER_SIZE;
 578
 579         for( i = 0; i < 240; i++, data += 512 ) {
 580                 const int y = ( i * 242 ) / 240;
 581
 582                 int j, prevX, nextX;
 583                 int Y, Cr, Cb;
 584
 585                 if ( y == 242 - 1 ) {
 586                         nextY = -512;
 587                 }
 588
 589                 prevX = 1;
 590                 nextX = 1;
 591
 592                 for ( j = 0; j < 320; j++, rgb += 3 ) {
 593                         const int x = ( j * 512 ) / 320;
 594                         const u8 * const src = &data[x];
 595
 596                         if ( x == 512 - 1 ) {
 597                                 nextX = -1;
 598                         }
 599
 600                         Cr = ( src[prevX] - src[0] ) +
 601                                 ( src[nextX] - src[0] );
 602                         Cr /= 2;
 603
 604                         Cb = ( src[prevY] - src[prevX + prevY] ) +
 605                                 ( src[prevY] - src[nextX + prevY] ) +
 606                                 ( src[nextY] - src[prevX + nextY] ) +
 607                                 ( src[nextY] - src[nextX + nextY] );
 608                         Cb /= 4;
 609
 610                         Y = 1160 * ( src[0] + ( Cr / 2 ) - 16 );
 611
 612                         if ( i & 1 ) {
 613                                 int Ct = Cr;
 614                                 Cr = Cb;
 615                                 Cb = Ct;
 616                         }
 617
 618                         if ( ( x ^ i ) & 1 ) {
 619                                 Cr = -Cr;
 620                                 Cb = -Cb;
 621                         }
 622
 623                         rgb[0] = clamp( ( ( Y + ( 2017 * Cb ) ) +
 624                                         500 ) / 900, 0, 255 );
 625                         rgb[1] = clamp( ( ( Y - ( 392 * Cb ) -
 626                                           ( 813 * Cr ) ) +
 627                                           500 ) / 1000, 0, 255 );
 628                         rgb[2] = clamp( ( ( Y + ( 1594 * Cr ) ) +
 629                                         500 ) / 1300, 0, 255 );
 630
 631                         prevX = -1;
 632                 }
 633
 634                 prevY = -512;
 635         }
 636 }
 637
 638 static void
 639 read_frame(struct vicam_camera *cam, int framenum)
 640 {
 641         unsigned char *request = cam->cntrlbuf;
 642         int realShutter;
 643         int n;
 644         int actual_length;
 645
 646         if (cam->needsDummyRead) {
 647                 cam->needsDummyRead = 0;
 648                 read_frame(cam, framenum);
 649         }
 650
 651         memset(request, 0, 16);
 652         request[0] = cam->gain; // 0 = 0% gain, FF = 100% gain
 653
 654         request[1] = 0; // 512x242 capture
 655
 656         request[2] = 0x90;      // the function of these two bytes
 657         request[3] = 0x07;      // is not yet understood
 658
 659         if (cam->shutter_speed > 60) {
 660                 // Short exposure
 661                 realShutter =
 662                     ((-15631900 / cam->shutter_speed) + 260533) / 1000;
 663                 request[4] = realShutter & 0xFF;
 664                 request[5] = (realShutter >> 8) & 0xFF;
 665                 request[6] = 0x03;
 666                 request[7] = 0x01;
 667         } else {
 668                 // Long exposure
 669                 realShutter = 15600 / cam->shutter_speed - 1;
 670                 request[4] = 0;
 671                 request[5] = 0;
 672                 request[6] = realShutter & 0xFF;
 673                 request[7] = realShutter >> 8;
 674         }
 675
 676         // Per John Markus Bjørndalen, byte at index 8 causes problems if it isn't 0
 677         request[8] = 0;
 678         // bytes 9-15 do not seem to affect exposure or image quality
 679
 680         mutex_lock(&cam->cam_lock);
 681
 682         if (!cam->udev) {
 683                 goto done;
 684         }
 685
 686         n = __send_control_msg(cam, 0x51, 0x80, 0, request, 16);
 687
 688         if (n < 0) {
 689                 printk(KERN_ERR
 690                        " Problem sending frame capture control message");
 691                 goto done;
 692         }
 693
 694         n = usb_bulk_msg(cam->udev,
 695                          usb_rcvbulkpipe(cam->udev, cam->bulkEndpoint),
 696                          cam->raw_image,
 697                          512 * 242 + 128, &actual_length, 10000);
 698
 699         if (n < 0) {
 700                 printk(KERN_ERR "Problem during bulk read of frame data: %d\n",
 701                        n);
 702         }
 703
 704  done:
 705         mutex_unlock(&cam->cam_lock);
 706 }
 707
 708 static ssize_t
 709 vicam_read( struct file *file, char __user *buf, size_t count, loff_t *ppos )
 710 {
 711         struct vicam_camera *cam = file->private_data;
 712
 713         DBG("read %d bytes.\n", (int) count);
 714
 715         if (*ppos >= VICAM_MAX_FRAME_SIZE) {
 716                 *ppos = 0;
 717                 return 0;
 718         }
 719
 720         if (*ppos == 0) {
 721                 read_frame(cam, 0);
 722                 vicam_decode_color(cam->raw_image,
 723                                    cam->framebuf +
 724                                    0 * VICAM_MAX_FRAME_SIZE);
 725         }
 726
 727         count = min_t(size_t, count, VICAM_MAX_FRAME_SIZE - *ppos);
 728
 729         if (copy_to_user(buf, &cam->framebuf[*ppos], count)) {
 730                 count = -EFAULT;
 731         } else {
 732                 *ppos += count;
 733         }
 734
 735         if (count == VICAM_MAX_FRAME_SIZE) {
 736                 *ppos = 0;
 737         }
 738
 739         return count;
 740 }
 741
 742
 743 static int
 744 vicam_mmap(struct file *file, struct vm_area_struct *vma)
 745 {
 746         // TODO: allocate the raw frame buffer if necessary
 747         unsigned long page, pos;
 748         unsigned long start = vma->vm_start;
 749         unsigned long size  = vma->vm_end-vma->vm_start;
 750         struct vicam_camera *cam = file->private_data;
 751
 752         if (!cam)
 753                 return -ENODEV;
 754
 755         DBG("vicam_mmap: %ld\n", size);
 756
 757         /* We let mmap allocate as much as it wants because Linux was adding 2048 bytes
 758          * to the size the application requested for mmap and it was screwing apps up.
 759          if (size > VICAM_FRAMES*VICAM_MAX_FRAME_SIZE)
 760          return -EINVAL;
 761          */
 762
 763         pos = (unsigned long)cam->framebuf;
 764         while (size > 0) {
 765                 page = vmalloc_to_pfn((void *)pos);
 766                 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
 767                         return -EAGAIN;
 768
 769                 start += PAGE_SIZE;
 770                 pos += PAGE_SIZE;
 771                 if (size > PAGE_SIZE)
 772                         size -= PAGE_SIZE;
 773                 else
 774                         size = 0;
 775         }
 776
 777         return 0;
 778 }
 779
 780 static const struct file_operations vicam_fops = {
 781         .owner          = THIS_MODULE,
 782         .open           = vicam_open,
 783         .release        = vicam_close,
 784         .read           = vicam_read,
 785         .mmap           = vicam_mmap,
 786         .ioctl          = vicam_ioctl,
 787 #ifdef CONFIG_COMPAT
 788         .compat_ioctl   = v4l_compat_ioctl32,
 789 #endif
 790         .llseek         = no_llseek,
 791 };
 792
 793 static struct video_device vicam_template = {
 794         .owner          = THIS_MODULE,
 795         .name           = "ViCam-based USB Camera",
 796         .type           = VID_TYPE_CAPTURE,
 797         .fops           = &vicam_fops,
 798         .minor          = -1,
 799 };
 800
 801 /* table of devices that work with this driver */
 802 static struct usb_device_id vicam_table[] = {
 803         {USB_DEVICE(USB_VICAM_VENDOR_ID, USB_VICAM_PRODUCT_ID)},
 804         {USB_DEVICE(USB_COMPRO_VENDOR_ID, USB_COMPRO_PRODUCT_ID)},
 805         {}                      /* Terminating entry */
 806 };
 807
 808 MODULE_DEVICE_TABLE(usb, vicam_table);
 809
 810 static struct usb_driver vicam_driver = {
 811         .name           = "vicam",
 812         .probe          = vicam_probe,
 813         .disconnect     = vicam_disconnect,
 814         .id_table       = vicam_table
 815 };
 816
 817 /**
 818  *      vicam_probe
 819  *      @intf: the interface
 820  *      @id: the device id
 821  *
 822  *      Called by the usb core when a new device is connected that it thinks
 823  *      this driver might be interested in.
 824  */
 825 static int
 826 vicam_probe( struct usb_interface *intf, const struct usb_device_id *id)
 827 {
 828         struct usb_device *dev = interface_to_usbdev(intf);
 829         int bulkEndpoint = 0;
 830         const struct usb_host_interface *interface;
 831         const struct usb_endpoint_descriptor *endpoint;
 832         struct vicam_camera *cam;
 833
 834         printk(KERN_INFO "ViCam based webcam connected\n");
 835
 836         interface = intf->cur_altsetting;
 837
 838         DBG(KERN_DEBUG "Interface %d. has %u. endpoints!\n",
 839                interface->desc.bInterfaceNumber, (unsigned) (interface->desc.bNumEndpoints));
 840         endpoint = &interface->endpoint[0].desc;
 841
 842         if ((endpoint->bEndpointAddress & 0x80) &&
 843             ((endpoint->bmAttributes & 3) == 0x02)) {
 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,
 864                sizeof (vicam_template));
 865         cam->vdev.priv = cam;   // sort of a reverse mapping for those functions that get vdev only
 866
 867         cam->udev = dev;
 868         cam->bulkEndpoint = bulkEndpoint;
 869
 870         if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1) == -1) {
 871                 kfree(cam);
 872                 printk(KERN_WARNING "video_register_device failed\n");
 873                 return -EIO;
 874         }
 875
 876         printk(KERN_INFO "ViCam webcam driver now controlling video device %d\n",cam->vdev.minor);
 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");