drivers/staging/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@ucw.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 "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 *uninitialized_var(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         status = send_control_msg(cam, 0x50, state, 0, NULL, 0);
 223         if (status < 0)
 224                 return status;
 225
 226         if (state)
 227                 send_control_msg(cam, 0x55, 1, 0, NULL, 0);
 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",
 412                             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         /* cam_lock/open_count protects us from simultaneous opens
 487          * ... for now. we probably shouldn't rely on this fact forever.
 488          */
 489
 490         mutex_lock(&cam->cam_lock);
 491         if (cam->open_count > 0) {
 492                 printk(KERN_INFO
 493                        "vicam_open called on already opened camera");
 494                 mutex_unlock(&cam->cam_lock);
 495                 return -EBUSY;
 496         }
 497
 498         cam->raw_image = kmalloc(VICAM_MAX_READ_SIZE, GFP_KERNEL);
 499         if (!cam->raw_image) {
 500                 mutex_unlock(&cam->cam_lock);
 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                 mutex_unlock(&cam->cam_lock);
 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                 mutex_unlock(&cam->cam_lock);
 516                 return -ENOMEM;
 517         }
 518
 519         cam->needsDummyRead = 1;
 520         cam->open_count++;
 521
 522         file->private_data = cam;
 523         mutex_unlock(&cam->cam_lock);
 524
 525
 526         /* First upload firmware, then turn the camera on */
 527
 528         if (!cam->is_initialized) {
 529                 initialize_camera(cam);
 530
 531                 cam->is_initialized = 1;
 532         }
 533
 534         set_camera_power(cam, 1);
 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         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                 prevX = 1;
 595                 nextX = 1;
 596
 597                 for (j = 0; j < 320; j++, rgb += 3) {
 598                         const int x = (j * 512) / 320;
 599                         const u8 * const src = &data[x];
 600
 601                         if (x == 512 - 1)
 602                                 nextX = -1;
 603
 604                         Cr = (src[prevX] - src[0]) +
 605                                 (src[nextX] - src[0]);
 606                         Cr /= 2;
 607
 608                         Cb = (src[prevY] - src[prevX + prevY]) +
 609                                 (src[prevY] - src[nextX + prevY]) +
 610                                 (src[nextY] - src[prevX + nextY]) +
 611                                 (src[nextY] - src[nextX + nextY]);
 612                         Cb /= 4;
 613
 614                         Y = 1160 * (src[0] + (Cr / 2) - 16);
 615
 616                         if (i & 1) {
 617                                 int Ct = Cr;
 618                                 Cr = Cb;
 619                                 Cb = Ct;
 620                         }
 621
 622                         if ((x ^ i) & 1) {
 623                                 Cr = -Cr;
 624                                 Cb = -Cb;
 625                         }
 626
 627                         rgb[0] = clamp(((Y + (2017 * Cb)) +
 628                                         500) / 900, 0, 255);
 629                         rgb[1] = clamp(((Y - (392 * Cb) -
 630                                           (813 * Cr)) +
 631                                           500) / 1000, 0, 255);
 632                         rgb[2] = clamp(((Y + (1594 * Cr)) +
 633                                         500) / 1300, 0, 255);
 634
 635                         prevX = -1;
 636                 }
 637
 638                 prevY = -512;
 639         }
 640 }
 641
 642 static void
 643 read_frame(struct vicam_camera *cam, int framenum)
 644 {
 645         unsigned char *request = cam->cntrlbuf;
 646         int realShutter;
 647         int n;
 648         int actual_length;
 649
 650         if (cam->needsDummyRead) {
 651                 cam->needsDummyRead = 0;
 652                 read_frame(cam, framenum);
 653         }
 654
 655         memset(request, 0, 16);
 656         request[0] = cam->gain; /* 0 = 0% gain, FF = 100% gain */
 657
 658         request[1] = 0; /* 512x242 capture */
 659
 660         request[2] = 0x90;      /* the function of these two bytes */
 661         request[3] = 0x07;      /* is not yet understood */
 662
 663         if (cam->shutter_speed > 60) {
 664                 /* Short exposure */
 665                 realShutter =
 666                     ((-15631900 / cam->shutter_speed) + 260533) / 1000;
 667                 request[4] = realShutter & 0xFF;
 668                 request[5] = (realShutter >> 8) & 0xFF;
 669                 request[6] = 0x03;
 670                 request[7] = 0x01;
 671         } else {
 672                 /* Long exposure */
 673                 realShutter = 15600 / cam->shutter_speed - 1;
 674                 request[4] = 0;
 675                 request[5] = 0;
 676                 request[6] = realShutter & 0xFF;
 677                 request[7] = realShutter >> 8;
 678         }
 679
 680         /* Per John Markus Bjørndalen, byte at index 8 causes problems if it isn't 0*/
 681         request[8] = 0;
 682         /* bytes 9-15 do not seem to affect exposure or image quality */
 683
 684         mutex_lock(&cam->cam_lock);
 685
 686         if (!cam->udev)
 687                 goto done;
 688
 689         n = __send_control_msg(cam, 0x51, 0x80, 0, request, 16);
 690
 691         if (n < 0) {
 692                 printk(KERN_ERR
 693                        " Problem sending frame capture control message");
 694                 goto done;
 695         }
 696
 697         n = usb_bulk_msg(cam->udev,
 698                          usb_rcvbulkpipe(cam->udev, cam->bulkEndpoint),
 699                          cam->raw_image,
 700                          512 * 242 + 128, &actual_length, 10000);
 701
 702         if (n < 0) {
 703                 printk(KERN_ERR "Problem during bulk read of frame data: %d\n",
 704                        n);
 705         }
 706
 707  done:
 708         mutex_unlock(&cam->cam_lock);
 709 }
 710
 711 static ssize_t
 712 vicam_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
 713 {
 714         struct vicam_camera *cam = file->private_data;
 715
 716         DBG("read %d bytes.\n", (int) count);
 717
 718         if (*ppos >= VICAM_MAX_FRAME_SIZE) {
 719                 *ppos = 0;
 720                 return 0;
 721         }
 722
 723         if (*ppos == 0) {
 724                 read_frame(cam, 0);
 725                 vicam_decode_color(cam->raw_image,
 726                                    cam->framebuf +
 727                                    0 * VICAM_MAX_FRAME_SIZE);
 728         }
 729
 730         count = min_t(size_t, count, VICAM_MAX_FRAME_SIZE - *ppos);
 731
 732         if (copy_to_user(buf, &cam->framebuf[*ppos], count))
 733                 count = -EFAULT;
 734         else
 735                 *ppos += count;
 736
 737         if (count == VICAM_MAX_FRAME_SIZE)
 738                 *ppos = 0;
 739
 740         return count;
 741 }
 742
 743
 744 static int
 745 vicam_mmap(struct file *file, struct vm_area_struct *vma)
 746 {
 747         /* TODO: allocate the raw frame buffer if necessary */
 748         unsigned long page, pos;
 749         unsigned long start = vma->vm_start;
 750         unsigned long size  = vma->vm_end-vma->vm_start;
 751         struct vicam_camera *cam = file->private_data;
 752
 753         if (!cam)
 754                 return -ENODEV;
 755
 756         DBG("vicam_mmap: %ld\n", size);
 757
 758         /* We let mmap allocate as much as it wants because Linux was adding 2048 bytes
 759          * to the size the application requested for mmap and it was screwing apps up.
 760          if (size > VICAM_FRAMES*VICAM_MAX_FRAME_SIZE)
 761          return -EINVAL;
 762          */
 763
 764         pos = (unsigned long)cam->framebuf;
 765         while (size > 0) {
 766                 page = vmalloc_to_pfn((void *)pos);
 767                 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
 768                         return -EAGAIN;
 769
 770                 start += PAGE_SIZE;
 771                 pos += PAGE_SIZE;
 772                 if (size > PAGE_SIZE)
 773                         size -= PAGE_SIZE;
 774                 else
 775                         size = 0;
 776         }
 777
 778         return 0;
 779 }
 780
 781 static const struct v4l2_file_operations vicam_fops = {
 782         .owner          = THIS_MODULE,
 783         .open           = vicam_open,
 784         .release        = vicam_close,
 785         .read           = vicam_read,
 786         .mmap           = vicam_mmap,
 787         .ioctl          = vicam_ioctl,
 788 };
 789
 790 static struct video_device vicam_template = {
 791         .name           = "ViCam-based USB Camera",
 792         .fops           = &vicam_fops,
 793         .release        = video_device_release_empty,
 794 };
 795
 796 /* table of devices that work with this driver */
 797 static struct usb_device_id vicam_table[] = {
 798         {USB_DEVICE(USB_VICAM_VENDOR_ID, USB_VICAM_PRODUCT_ID)},
 799         {USB_DEVICE(USB_COMPRO_VENDOR_ID, USB_COMPRO_PRODUCT_ID)},
 800         {}                      /* Terminating entry */
 801 };
 802
 803 MODULE_DEVICE_TABLE(usb, vicam_table);
 804
 805 static struct usb_driver vicam_driver = {
 806         .name           = "vicam",
 807         .probe          = vicam_probe,
 808         .disconnect     = vicam_disconnect,
 809         .id_table       = vicam_table
 810 };
 811
 812 /**
 813  *      vicam_probe
 814  *      @intf: the interface
 815  *      @id: the device id
 816  *
 817  *      Called by the usb core when a new device is connected that it thinks
 818  *      this driver might be interested in.
 819  */
 820 static int
 821 vicam_probe(struct usb_interface *intf, const struct usb_device_id *id)
 822 {
 823         struct usb_device *dev = interface_to_usbdev(intf);
 824         int bulkEndpoint = 0;
 825         const struct usb_host_interface *interface;
 826         const struct usb_endpoint_descriptor *endpoint;
 827         struct vicam_camera *cam;
 828
 829         printk(KERN_INFO "ViCam based webcam connected\n");
 830
 831         interface = intf->cur_altsetting;
 832
 833         DBG(KERN_DEBUG "Interface %d. has %u. endpoints!\n",
 834                interface->desc.bInterfaceNumber, (unsigned) (interface->desc.bNumEndpoints));
 835         endpoint = &interface->endpoint[0].desc;
 836
 837         if (usb_endpoint_is_bulk_in(endpoint)) {
 838                 /* we found a bulk in endpoint */
 839                 bulkEndpoint = endpoint->bEndpointAddress;
 840         } else {
 841                 printk(KERN_ERR
 842                        "No bulk in endpoint was found ?! (this is bad)\n");
 843         }
 844
 845         cam = kzalloc(sizeof(struct vicam_camera), GFP_KERNEL);
 846         if (cam == NULL) {
 847                 printk(KERN_WARNING
 848                        "could not allocate kernel memory for vicam_camera struct\n");
 849                 return -ENOMEM;
 850         }
 851
 852
 853         cam->shutter_speed = 15;
 854
 855         mutex_init(&cam->cam_lock);
 856
 857         memcpy(&cam->vdev, &vicam_template, sizeof(vicam_template));
 858         video_set_drvdata(&cam->vdev, cam);
 859
 860         cam->udev = dev;
 861         cam->bulkEndpoint = bulkEndpoint;
 862
 863         if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1) < 0) {
 864                 kfree(cam);
 865                 printk(KERN_WARNING "video_register_device failed\n");
 866                 return -EIO;
 867         }
 868
 869         printk(KERN_INFO "ViCam webcam driver now controlling device %s\n",
 870                 video_device_node_name(&cam->vdev));
 871
 872         usb_set_intfdata(intf, cam);
 873
 874         return 0;
 875 }
 876
 877 static void
 878 vicam_disconnect(struct usb_interface *intf)
 879 {
 880         int open_count;
 881         struct vicam_camera *cam = usb_get_intfdata(intf);
 882         usb_set_intfdata(intf, NULL);
 883
 884         /* we must unregister the device before taking its
 885          * cam_lock. This is because the video open call
 886          * holds the same lock as video unregister. if we
 887          * unregister inside of the cam_lock and open also
 888          * uses the cam_lock, we get deadlock.
 889          */
 890
 891         video_unregister_device(&cam->vdev);
 892
 893         /* stop the camera from being used */
 894
 895         mutex_lock(&cam->cam_lock);
 896
 897         /* mark the camera as gone */
 898
 899         cam->udev = NULL;
 900
 901         /* the only thing left to do is synchronize with
 902          * our close/release function on who should release
 903          * the camera memory. if there are any users using the
 904          * camera, it's their job. if there are no users,
 905          * it's ours.
 906          */
 907
 908         open_count = cam->open_count;
 909
 910         mutex_unlock(&cam->cam_lock);
 911
 912         if (!open_count)
 913                 kfree(cam);
 914
 915         printk(KERN_DEBUG "ViCam-based WebCam disconnected\n");
 916 }
 917
 918 /*
 919  */
 920 static int __init
 921 usb_vicam_init(void)
 922 {
 923         int retval;
 924         DBG(KERN_INFO "ViCam-based WebCam driver startup\n");
 925         retval = usb_register(&vicam_driver);
 926         if (retval)
 927                 printk(KERN_WARNING "usb_register failed!\n");
 928         return retval;
 929 }
 930
 931 static void __exit
 932 usb_vicam_exit(void)
 933 {
 934         DBG(KERN_INFO
 935                "ViCam-based WebCam driver shutdown\n");
 936
 937         usb_deregister(&vicam_driver);
 938 }
 939
 940 module_init(usb_vicam_init);
 941 module_exit(usb_vicam_exit);
 942
 943 MODULE_AUTHOR(DRIVER_AUTHOR);
 944 MODULE_DESCRIPTION(DRIVER_DESC);
 945 MODULE_LICENSE("GPL");
 946 MODULE_FIRMWARE("vicam/firmware.fw");