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