linux/drivers/media/video/usbvideo/vicam.c
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   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*/
  84static 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
 105static 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
 121struct 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
 141static int vicam_probe( struct usb_interface *intf, const struct usb_device_id *id);
 142static void vicam_disconnect(struct usb_interface *intf);
 143static void read_frame(struct vicam_camera *cam, int framenum);
 144static void vicam_decode_color(const u8 *, u8 *);
 145
 146static 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
 174static 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}
 190static int
 191initialize_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
 218static int
 219set_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
 233static long
 234vicam_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
 473static int
 474vicam_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
 539static int
 540vicam_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
 573static 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
 645static void
 646read_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 Bj\xC3\xB8rndalen, 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
 715static ssize_t
 716vicam_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
 750static int
 751vicam_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
 787static 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
 796static struct video_device vicam_template = {
 797        .name           = "ViCam-based USB Camera",
 798        .fops           = &vicam_fops,
 799        .release        = video_device_release_empty,
 800};
 801
 802/* table of devices that work with this driver */
 803static struct usb_device_id vicam_table[] = {
 804        {USB_DEVICE(USB_VICAM_VENDOR_ID, USB_VICAM_PRODUCT_ID)},
 805        {USB_DEVICE(USB_COMPRO_VENDOR_ID, USB_COMPRO_PRODUCT_ID)},
 806        {}                      /* Terminating entry */
 807};
 808
 809MODULE_DEVICE_TABLE(usb, vicam_table);
 810
 811static struct usb_driver vicam_driver = {
 812        .name           = "vicam",
 813        .probe          = vicam_probe,
 814        .disconnect     = vicam_disconnect,
 815        .id_table       = vicam_table
 816};
 817
 818/**
 819 *      vicam_probe
 820 *      @intf: the interface
 821 *      @id: the device id
 822 *
 823 *      Called by the usb core when a new device is connected that it thinks
 824 *      this driver might be interested in.
 825 */
 826static int
 827vicam_probe( struct usb_interface *intf, const struct usb_device_id *id)
 828{
 829        struct usb_device *dev = interface_to_usbdev(intf);
 830        int bulkEndpoint = 0;
 831        const struct usb_host_interface *interface;
 832        const struct usb_endpoint_descriptor *endpoint;
 833        struct vicam_camera *cam;
 834
 835        printk(KERN_INFO "ViCam based webcam connected\n");
 836
 837        interface = intf->cur_altsetting;
 838
 839        DBG(KERN_DEBUG "Interface %d. has %u. endpoints!\n",
 840               interface->desc.bInterfaceNumber, (unsigned) (interface->desc.bNumEndpoints));
 841        endpoint = &interface->endpoint[0].desc;
 842
 843        if (usb_endpoint_is_bulk_in(endpoint)) {
 844                /* we found a bulk in endpoint */
 845                bulkEndpoint = endpoint->bEndpointAddress;
 846        } else {
 847                printk(KERN_ERR
 848                       "No bulk in endpoint was found ?! (this is bad)\n");
 849        }
 850
 851        if ((cam =
 852             kzalloc(sizeof (struct vicam_camera), GFP_KERNEL)) == NULL) {
 853                printk(KERN_WARNING
 854                       "could not allocate kernel memory for vicam_camera struct\n");
 855                return -ENOMEM;
 856        }
 857
 858
 859        cam->shutter_speed = 15;
 860
 861        mutex_init(&cam->cam_lock);
 862
 863        memcpy(&cam->vdev, &vicam_template, sizeof(vicam_template));
 864        video_set_drvdata(&cam->vdev, cam);
 865
 866        cam->udev = dev;
 867        cam->bulkEndpoint = bulkEndpoint;
 868
 869        if (video_register_device(&cam->vdev, VFL_TYPE_GRABBER, -1) < 0) {
 870                kfree(cam);
 871                printk(KERN_WARNING "video_register_device failed\n");
 872                return -EIO;
 873        }
 874
 875        printk(KERN_INFO "ViCam webcam driver now controlling device %s\n",
 876                video_device_node_name(&cam->vdev));
 877
 878        usb_set_intfdata (intf, cam);
 879
 880        return 0;
 881}
 882
 883static void
 884vicam_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 */
 927static int __init
 928usb_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
 938static void __exit
 939usb_vicam_exit(void)
 940{
 941        DBG(KERN_INFO
 942               "ViCam-based WebCam driver shutdown\n");
 943
 944        usb_deregister(&vicam_driver);
 945}
 946
 947module_init(usb_vicam_init);
 948module_exit(usb_vicam_exit);
 949
 950MODULE_AUTHOR(DRIVER_AUTHOR);
 951MODULE_DESCRIPTION(DRIVER_DESC);
 952MODULE_LICENSE("GPL");
 953MODULE_FIRMWARE("vicam/firmware.fw");
 954