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

   1 /*
   2  *      Video4Linux Colour QuickCam driver
   3  *      Copyright 1997-2000 Philip Blundell <philb@gnu.org>
   4  *
   5  *    Module parameters:
   6  *
   7  *      parport=auto      -- probe all parports (default)
   8  *      parport=0         -- parport0 becomes qcam1
   9  *      parport=2,0,1     -- parports 2,0,1 are tried in that order
  10  *
  11  *      probe=0           -- do no probing, assume camera is present
  12  *      probe=1           -- use IEEE-1284 autoprobe data only (default)
  13  *      probe=2           -- probe aggressively for cameras
  14  *
  15  *      force_rgb=1       -- force data format to RGB (default is BGR)
  16  *
  17  * The parport parameter controls which parports will be scanned.
  18  * Scanning all parports causes some printers to print a garbage page.
  19  *       -- March 14, 1999  Billy Donahue <billy@escape.com>
  20  *
  21  * Fixed data format to BGR, added force_rgb parameter. Added missing
  22  * parport_unregister_driver() on module removal.
  23  *       -- May 28, 2000  Claudio Matsuoka <claudio@conectiva.com>
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/delay.h>
  28 #include <linux/errno.h>
  29 #include <linux/fs.h>
  30 #include <linux/init.h>
  31 #include <linux/kernel.h>
  32 #include <linux/slab.h>
  33 #include <linux/mm.h>
  34 #include <linux/parport.h>
  35 #include <linux/sched.h>
  36 #include <linux/videodev.h>
  37 #include <media/v4l2-common.h>
  38 #include <linux/mutex.h>
  39
  40 #include <asm/uaccess.h>
  41
  42 struct qcam_device {
  43         struct video_device vdev;
  44         struct pardevice *pdev;
  45         struct parport *pport;
  46         int width, height;
  47         int ccd_width, ccd_height;
  48         int mode;
  49         int contrast, brightness, whitebal;
  50         int top, left;
  51         unsigned int bidirectional;
  52         struct mutex lock;
  53 };
  54
  55 /* cameras maximum */
  56 #define MAX_CAMS 4
  57
  58 /* The three possible QuickCam modes */
  59 #define QC_MILLIONS     0x18
  60 #define QC_BILLIONS     0x10
  61 #define QC_THOUSANDS    0x08    /* with VIDEC compression (not supported) */
  62
  63 /* The three possible decimations */
  64 #define QC_DECIMATION_1         0
  65 #define QC_DECIMATION_2         2
  66 #define QC_DECIMATION_4         4
  67
  68 #define BANNER "Colour QuickCam for Video4Linux v0.05"
  69
  70 static int parport[MAX_CAMS] = { [1 ... MAX_CAMS-1] = -1 };
  71 static int probe = 2;
  72 static int force_rgb = 0;
  73 static int video_nr = -1;
  74
  75 static inline void qcam_set_ack(struct qcam_device *qcam, unsigned int i)
  76 {
  77         /* note: the QC specs refer to the PCAck pin by voltage, not
  78            software level.  PC ports have builtin inverters. */
  79         parport_frob_control(qcam->pport, 8, i?8:0);
  80 }
  81
  82 static inline unsigned int qcam_ready1(struct qcam_device *qcam)
  83 {
  84         return (parport_read_status(qcam->pport) & 0x8)?1:0;
  85 }
  86
  87 static inline unsigned int qcam_ready2(struct qcam_device *qcam)
  88 {
  89         return (parport_read_data(qcam->pport) & 0x1)?1:0;
  90 }
  91
  92 static unsigned int qcam_await_ready1(struct qcam_device *qcam,
  93                                              int value)
  94 {
  95         unsigned long oldjiffies = jiffies;
  96         unsigned int i;
  97
  98         for (oldjiffies = jiffies; (jiffies - oldjiffies) < msecs_to_jiffies(40); )
  99                 if (qcam_ready1(qcam) == value)
 100                         return 0;
 101
 102         /* If the camera didn't respond within 1/25 second, poll slowly
 103            for a while. */
 104         for (i = 0; i < 50; i++)
 105         {
 106                 if (qcam_ready1(qcam) == value)
 107                         return 0;
 108                 msleep_interruptible(100);
 109         }
 110
 111         /* Probably somebody pulled the plug out.  Not much we can do. */
 112         printk(KERN_ERR "c-qcam: ready1 timeout (%d) %x %x\n", value,
 113                parport_read_status(qcam->pport),
 114                parport_read_control(qcam->pport));
 115         return 1;
 116 }
 117
 118 static unsigned int qcam_await_ready2(struct qcam_device *qcam, int value)
 119 {
 120         unsigned long oldjiffies = jiffies;
 121         unsigned int i;
 122
 123         for (oldjiffies = jiffies; (jiffies - oldjiffies) < msecs_to_jiffies(40); )
 124                 if (qcam_ready2(qcam) == value)
 125                         return 0;
 126
 127         /* If the camera didn't respond within 1/25 second, poll slowly
 128            for a while. */
 129         for (i = 0; i < 50; i++)
 130         {
 131                 if (qcam_ready2(qcam) == value)
 132                         return 0;
 133                 msleep_interruptible(100);
 134         }
 135
 136         /* Probably somebody pulled the plug out.  Not much we can do. */
 137         printk(KERN_ERR "c-qcam: ready2 timeout (%d) %x %x %x\n", value,
 138                parport_read_status(qcam->pport),
 139                parport_read_control(qcam->pport),
 140                parport_read_data(qcam->pport));
 141         return 1;
 142 }
 143
 144 static int qcam_read_data(struct qcam_device *qcam)
 145 {
 146         unsigned int idata;
 147         qcam_set_ack(qcam, 0);
 148         if (qcam_await_ready1(qcam, 1)) return -1;
 149         idata = parport_read_status(qcam->pport) & 0xf0;
 150         qcam_set_ack(qcam, 1);
 151         if (qcam_await_ready1(qcam, 0)) return -1;
 152         idata |= (parport_read_status(qcam->pport) >> 4);
 153         return idata;
 154 }
 155
 156 static int qcam_write_data(struct qcam_device *qcam, unsigned int data)
 157 {
 158         unsigned int idata;
 159         parport_write_data(qcam->pport, data);
 160         idata = qcam_read_data(qcam);
 161         if (data != idata)
 162         {
 163                 printk(KERN_WARNING "cqcam: sent %x but received %x\n", data,
 164                        idata);
 165                 return 1;
 166         }
 167         return 0;
 168 }
 169
 170 static inline int qcam_set(struct qcam_device *qcam, unsigned int cmd, unsigned int data)
 171 {
 172         if (qcam_write_data(qcam, cmd))
 173                 return -1;
 174         if (qcam_write_data(qcam, data))
 175                 return -1;
 176         return 0;
 177 }
 178
 179 static inline int qcam_get(struct qcam_device *qcam, unsigned int cmd)
 180 {
 181         if (qcam_write_data(qcam, cmd))
 182                 return -1;
 183         return qcam_read_data(qcam);
 184 }
 185
 186 static int qc_detect(struct qcam_device *qcam)
 187 {
 188         unsigned int stat, ostat, i, count = 0;
 189
 190         /* The probe routine below is not very reliable.  The IEEE-1284
 191            probe takes precedence. */
 192         /* XXX Currently parport provides no way to distinguish between
 193            "the IEEE probe was not done" and "the probe was done, but
 194            no device was found".  Fix this one day. */
 195         if (qcam->pport->probe_info[0].class == PARPORT_CLASS_MEDIA
 196             && qcam->pport->probe_info[0].model
 197             && !strcmp(qcam->pdev->port->probe_info[0].model,
 198                        "Color QuickCam 2.0")) {
 199                 printk(KERN_DEBUG "QuickCam: Found by IEEE1284 probe.\n");
 200                 return 1;
 201         }
 202
 203         if (probe < 2)
 204                 return 0;
 205
 206         parport_write_control(qcam->pport, 0xc);
 207
 208         /* look for a heartbeat */
 209         ostat = stat = parport_read_status(qcam->pport);
 210         for (i=0; i<250; i++)
 211         {
 212                 mdelay(1);
 213                 stat = parport_read_status(qcam->pport);
 214                 if (ostat != stat)
 215                 {
 216                         if (++count >= 3) return 1;
 217                         ostat = stat;
 218                 }
 219         }
 220
 221         /* Reset the camera and try again */
 222         parport_write_control(qcam->pport, 0xc);
 223         parport_write_control(qcam->pport, 0x8);
 224         mdelay(1);
 225         parport_write_control(qcam->pport, 0xc);
 226         mdelay(1);
 227         count = 0;
 228
 229         ostat = stat = parport_read_status(qcam->pport);
 230         for (i=0; i<250; i++)
 231         {
 232                 mdelay(1);
 233                 stat = parport_read_status(qcam->pport);
 234                 if (ostat != stat)
 235                 {
 236                         if (++count >= 3) return 1;
 237                         ostat = stat;
 238                 }
 239         }
 240
 241         /* no (or flatline) camera, give up */
 242         return 0;
 243 }
 244
 245 static void qc_reset(struct qcam_device *qcam)
 246 {
 247         parport_write_control(qcam->pport, 0xc);
 248         parport_write_control(qcam->pport, 0x8);
 249         mdelay(1);
 250         parport_write_control(qcam->pport, 0xc);
 251         mdelay(1);
 252 }
 253
 254 /* Reset the QuickCam and program for brightness, contrast,
 255  * white-balance, and resolution. */
 256
 257 static void qc_setup(struct qcam_device *q)
 258 {
 259         qc_reset(q);
 260
 261         /* Set the brightness.  */
 262         qcam_set(q, 11, q->brightness);
 263
 264         /* Set the height and width.  These refer to the actual
 265            CCD area *before* applying the selected decimation.  */
 266         qcam_set(q, 17, q->ccd_height);
 267         qcam_set(q, 19, q->ccd_width / 2);
 268
 269         /* Set top and left.  */
 270         qcam_set(q, 0xd, q->top);
 271         qcam_set(q, 0xf, q->left);
 272
 273         /* Set contrast and white balance.  */
 274         qcam_set(q, 0x19, q->contrast);
 275         qcam_set(q, 0x1f, q->whitebal);
 276
 277         /* Set the speed.  */
 278         qcam_set(q, 45, 2);
 279 }
 280
 281 /* Read some bytes from the camera and put them in the buffer.
 282    nbytes should be a multiple of 3, because bidirectional mode gives
 283    us three bytes at a time.  */
 284
 285 static unsigned int qcam_read_bytes(struct qcam_device *q, unsigned char *buf, unsigned int nbytes)
 286 {
 287         unsigned int bytes = 0;
 288
 289         qcam_set_ack(q, 0);
 290         if (q->bidirectional)
 291         {
 292                 /* It's a bidirectional port */
 293                 while (bytes < nbytes)
 294                 {
 295                         unsigned int lo1, hi1, lo2, hi2;
 296                         unsigned char r, g, b;
 297
 298                         if (qcam_await_ready2(q, 1)) return bytes;
 299                         lo1 = parport_read_data(q->pport) >> 1;
 300                         hi1 = ((parport_read_status(q->pport) >> 3) & 0x1f) ^ 0x10;
 301                         qcam_set_ack(q, 1);
 302                         if (qcam_await_ready2(q, 0)) return bytes;
 303                         lo2 = parport_read_data(q->pport) >> 1;
 304                         hi2 = ((parport_read_status(q->pport) >> 3) & 0x1f) ^ 0x10;
 305                         qcam_set_ack(q, 0);
 306                         r = (lo1 | ((hi1 & 1)<<7));
 307                         g = ((hi1 & 0x1e)<<3) | ((hi2 & 0x1e)>>1);
 308                         b = (lo2 | ((hi2 & 1)<<7));
 309                         if (force_rgb) {
 310                                 buf[bytes++] = r;
 311                                 buf[bytes++] = g;
 312                                 buf[bytes++] = b;
 313                         } else {
 314                                 buf[bytes++] = b;
 315                                 buf[bytes++] = g;
 316                                 buf[bytes++] = r;
 317                         }
 318                 }
 319         }
 320         else
 321         {
 322                 /* It's a unidirectional port */
 323                 int i = 0, n = bytes;
 324                 unsigned char rgb[3];
 325
 326                 while (bytes < nbytes)
 327                 {
 328                         unsigned int hi, lo;
 329
 330                         if (qcam_await_ready1(q, 1)) return bytes;
 331                         hi = (parport_read_status(q->pport) & 0xf0);
 332                         qcam_set_ack(q, 1);
 333                         if (qcam_await_ready1(q, 0)) return bytes;
 334                         lo = (parport_read_status(q->pport) & 0xf0);
 335                         qcam_set_ack(q, 0);
 336                         /* flip some bits */
 337                         rgb[(i = bytes++ % 3)] = (hi | (lo >> 4)) ^ 0x88;
 338                         if (i >= 2) {
 339 get_fragment:
 340                                 if (force_rgb) {
 341                                         buf[n++] = rgb[0];
 342                                         buf[n++] = rgb[1];
 343                                         buf[n++] = rgb[2];
 344                                 } else {
 345                                         buf[n++] = rgb[2];
 346                                         buf[n++] = rgb[1];
 347                                         buf[n++] = rgb[0];
 348                                 }
 349                         }
 350                 }
 351                 if (i) {
 352                         i = 0;
 353                         goto get_fragment;
 354                 }
 355         }
 356         return bytes;
 357 }
 358
 359 #define BUFSZ   150
 360
 361 static long qc_capture(struct qcam_device *q, char __user *buf, unsigned long len)
 362 {
 363         unsigned lines, pixelsperline, bitsperxfer;
 364         unsigned int is_bi_dir = q->bidirectional;
 365         size_t wantlen, outptr = 0;
 366         char tmpbuf[BUFSZ];
 367
 368         if (!access_ok(VERIFY_WRITE, buf, len))
 369                 return -EFAULT;
 370
 371         /* Wait for camera to become ready */
 372         for (;;)
 373         {
 374                 int i = qcam_get(q, 41);
 375                 if (i == -1) {
 376                         qc_setup(q);
 377                         return -EIO;
 378                 }
 379                 if ((i & 0x80) == 0)
 380                         break;
 381                 else
 382                         schedule();
 383         }
 384
 385         if (qcam_set(q, 7, (q->mode | (is_bi_dir?1:0)) + 1))
 386                 return -EIO;
 387
 388         lines = q->height;
 389         pixelsperline = q->width;
 390         bitsperxfer = (is_bi_dir) ? 24 : 8;
 391
 392         if (is_bi_dir)
 393         {
 394                 /* Turn the port around */
 395                 parport_data_reverse(q->pport);
 396                 mdelay(3);
 397                 qcam_set_ack(q, 0);
 398                 if (qcam_await_ready1(q, 1)) {
 399                         qc_setup(q);
 400                         return -EIO;
 401                 }
 402                 qcam_set_ack(q, 1);
 403                 if (qcam_await_ready1(q, 0)) {
 404                         qc_setup(q);
 405                         return -EIO;
 406                 }
 407         }
 408
 409         wantlen = lines * pixelsperline * 24 / 8;
 410
 411         while (wantlen)
 412         {
 413                 size_t t, s;
 414                 s = (wantlen > BUFSZ)?BUFSZ:wantlen;
 415                 t = qcam_read_bytes(q, tmpbuf, s);
 416                 if (outptr < len)
 417                 {
 418                         size_t sz = len - outptr;
 419                         if (sz > t) sz = t;
 420                         if (__copy_to_user(buf+outptr, tmpbuf, sz))
 421                                 break;
 422                         outptr += sz;
 423                 }
 424                 wantlen -= t;
 425                 if (t < s)
 426                         break;
 427                 cond_resched();
 428         }
 429
 430         len = outptr;
 431
 432         if (wantlen)
 433         {
 434                 printk("qcam: short read.\n");
 435                 if (is_bi_dir)
 436                         parport_data_forward(q->pport);
 437                 qc_setup(q);
 438                 return len;
 439         }
 440
 441         if (is_bi_dir)
 442         {
 443                 int l;
 444                 do {
 445                         l = qcam_read_bytes(q, tmpbuf, 3);
 446                         cond_resched();
 447                 } while (l && (tmpbuf[0] == 0x7e || tmpbuf[1] == 0x7e || tmpbuf[2] == 0x7e));
 448                 if (force_rgb) {
 449                         if (tmpbuf[0] != 0xe || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xf)
 450                                 printk("qcam: bad EOF\n");
 451                 } else {
 452                         if (tmpbuf[0] != 0xf || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xe)
 453                                 printk("qcam: bad EOF\n");
 454                 }
 455                 qcam_set_ack(q, 0);
 456                 if (qcam_await_ready1(q, 1))
 457                 {
 458                         printk("qcam: no ack after EOF\n");
 459                         parport_data_forward(q->pport);
 460                         qc_setup(q);
 461                         return len;
 462                 }
 463                 parport_data_forward(q->pport);
 464                 mdelay(3);
 465                 qcam_set_ack(q, 1);
 466                 if (qcam_await_ready1(q, 0))
 467                 {
 468                         printk("qcam: no ack to port turnaround\n");
 469                         qc_setup(q);
 470                         return len;
 471                 }
 472         }
 473         else
 474         {
 475                 int l;
 476                 do {
 477                         l = qcam_read_bytes(q, tmpbuf, 1);
 478                         cond_resched();
 479                 } while (l && tmpbuf[0] == 0x7e);
 480                 l = qcam_read_bytes(q, tmpbuf+1, 2);
 481                 if (force_rgb) {
 482                         if (tmpbuf[0] != 0xe || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xf)
 483                                 printk("qcam: bad EOF\n");
 484                 } else {
 485                         if (tmpbuf[0] != 0xf || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xe)
 486                                 printk("qcam: bad EOF\n");
 487                 }
 488         }
 489
 490         qcam_write_data(q, 0);
 491         return len;
 492 }
 493
 494 /*
 495  *      Video4linux interfacing
 496  */
 497
 498 static int qcam_do_ioctl(struct inode *inode, struct file *file,
 499                          unsigned int cmd, void *arg)
 500 {
 501         struct video_device *dev = video_devdata(file);
 502         struct qcam_device *qcam=(struct qcam_device *)dev;
 503
 504         switch(cmd)
 505         {
 506                 case VIDIOCGCAP:
 507                 {
 508                         struct video_capability *b = arg;
 509                         strcpy(b->name, "Quickcam");
 510                         b->type = VID_TYPE_CAPTURE|VID_TYPE_SCALES;
 511                         b->channels = 1;
 512                         b->audios = 0;
 513                         b->maxwidth = 320;
 514                         b->maxheight = 240;
 515                         b->minwidth = 80;
 516                         b->minheight = 60;
 517                         return 0;
 518                 }
 519                 case VIDIOCGCHAN:
 520                 {
 521                         struct video_channel *v = arg;
 522                         if(v->channel!=0)
 523                                 return -EINVAL;
 524                         v->flags=0;
 525                         v->tuners=0;
 526                         /* Good question.. its composite or SVHS so.. */
 527                         v->type = VIDEO_TYPE_CAMERA;
 528                         strcpy(v->name, "Camera");
 529                         return 0;
 530                 }
 531                 case VIDIOCSCHAN:
 532                 {
 533                         struct video_channel *v = arg;
 534                         if(v->channel!=0)
 535                                 return -EINVAL;
 536                         return 0;
 537                 }
 538                 case VIDIOCGTUNER:
 539                 {
 540                         struct video_tuner *v = arg;
 541                         if(v->tuner)
 542                                 return -EINVAL;
 543                         memset(v,0,sizeof(*v));
 544                         strcpy(v->name, "Format");
 545                         v->mode = VIDEO_MODE_AUTO;
 546                         return 0;
 547                 }
 548                 case VIDIOCSTUNER:
 549                 {
 550                         struct video_tuner *v = arg;
 551                         if(v->tuner)
 552                                 return -EINVAL;
 553                         if(v->mode!=VIDEO_MODE_AUTO)
 554                                 return -EINVAL;
 555                         return 0;
 556                 }
 557                 case VIDIOCGPICT:
 558                 {
 559                         struct video_picture *p = arg;
 560                         p->colour=0x8000;
 561                         p->hue=0x8000;
 562                         p->brightness=qcam->brightness<<8;
 563                         p->contrast=qcam->contrast<<8;
 564                         p->whiteness=qcam->whitebal<<8;
 565                         p->depth=24;
 566                         p->palette=VIDEO_PALETTE_RGB24;
 567                         return 0;
 568                 }
 569                 case VIDIOCSPICT:
 570                 {
 571                         struct video_picture *p = arg;
 572
 573                         /*
 574                          *      Sanity check args
 575                          */
 576                         if (p->depth != 24 || p->palette != VIDEO_PALETTE_RGB24)
 577                                 return -EINVAL;
 578
 579                         /*
 580                          *      Now load the camera.
 581                          */
 582                         qcam->brightness = p->brightness>>8;
 583                         qcam->contrast = p->contrast>>8;
 584                         qcam->whitebal = p->whiteness>>8;
 585
 586                         mutex_lock(&qcam->lock);
 587                         parport_claim_or_block(qcam->pdev);
 588                         qc_setup(qcam);
 589                         parport_release(qcam->pdev);
 590                         mutex_unlock(&qcam->lock);
 591                         return 0;
 592                 }
 593                 case VIDIOCSWIN:
 594                 {
 595                         struct video_window *vw = arg;
 596
 597                         if(vw->flags)
 598                                 return -EINVAL;
 599                         if(vw->clipcount)
 600                                 return -EINVAL;
 601                         if(vw->height<60||vw->height>240)
 602                                 return -EINVAL;
 603                         if(vw->width<80||vw->width>320)
 604                                 return -EINVAL;
 605
 606                         qcam->width = 80;
 607                         qcam->height = 60;
 608                         qcam->mode = QC_DECIMATION_4;
 609
 610                         if(vw->width>=160 && vw->height>=120)
 611                         {
 612                                 qcam->width = 160;
 613                                 qcam->height = 120;
 614                                 qcam->mode = QC_DECIMATION_2;
 615                         }
 616                         if(vw->width>=320 && vw->height>=240)
 617                         {
 618                                 qcam->width = 320;
 619                                 qcam->height = 240;
 620                                 qcam->mode = QC_DECIMATION_1;
 621                         }
 622                         qcam->mode |= QC_MILLIONS;
 623 #if 0
 624                         if(vw->width>=640 && vw->height>=480)
 625                         {
 626                                 qcam->width = 640;
 627                                 qcam->height = 480;
 628                                 qcam->mode = QC_BILLIONS | QC_DECIMATION_1;
 629                         }
 630 #endif
 631                         /* Ok we figured out what to use from our
 632                            wide choice */
 633                         mutex_lock(&qcam->lock);
 634                         parport_claim_or_block(qcam->pdev);
 635                         qc_setup(qcam);
 636                         parport_release(qcam->pdev);
 637                         mutex_unlock(&qcam->lock);
 638                         return 0;
 639                 }
 640                 case VIDIOCGWIN:
 641                 {
 642                         struct video_window *vw = arg;
 643                         memset(vw, 0, sizeof(*vw));
 644                         vw->width=qcam->width;
 645                         vw->height=qcam->height;
 646                         return 0;
 647                 }
 648                 case VIDIOCKEY:
 649                         return 0;
 650                 case VIDIOCCAPTURE:
 651                 case VIDIOCGFBUF:
 652                 case VIDIOCSFBUF:
 653                 case VIDIOCGFREQ:
 654                 case VIDIOCSFREQ:
 655                 case VIDIOCGAUDIO:
 656                 case VIDIOCSAUDIO:
 657                         return -EINVAL;
 658                 default:
 659                         return -ENOIOCTLCMD;
 660         }
 661         return 0;
 662 }
 663
 664 static int qcam_ioctl(struct inode *inode, struct file *file,
 665                      unsigned int cmd, unsigned long arg)
 666 {
 667         return video_usercopy(inode, file, cmd, arg, qcam_do_ioctl);
 668 }
 669
 670 static ssize_t qcam_read(struct file *file, char __user *buf,
 671                          size_t count, loff_t *ppos)
 672 {
 673         struct video_device *v = video_devdata(file);
 674         struct qcam_device *qcam=(struct qcam_device *)v;
 675         int len;
 676
 677         mutex_lock(&qcam->lock);
 678         parport_claim_or_block(qcam->pdev);
 679         /* Probably should have a semaphore against multiple users */
 680         len = qc_capture(qcam, buf,count);
 681         parport_release(qcam->pdev);
 682         mutex_unlock(&qcam->lock);
 683         return len;
 684 }
 685
 686 /* video device template */
 687 static const struct file_operations qcam_fops = {
 688         .owner          = THIS_MODULE,
 689         .open           = video_exclusive_open,
 690         .release        = video_exclusive_release,
 691         .ioctl          = qcam_ioctl,
 692         .compat_ioctl   = v4l_compat_ioctl32,
 693         .read           = qcam_read,
 694         .llseek         = no_llseek,
 695 };
 696
 697 static struct video_device qcam_template=
 698 {
 699         .owner          = THIS_MODULE,
 700         .name           = "Colour QuickCam",
 701         .type           = VID_TYPE_CAPTURE,
 702         .fops           = &qcam_fops,
 703 };
 704
 705 /* Initialize the QuickCam driver control structure. */
 706
 707 static struct qcam_device *qcam_init(struct parport *port)
 708 {
 709         struct qcam_device *q;
 710
 711         q = kmalloc(sizeof(struct qcam_device), GFP_KERNEL);
 712         if(q==NULL)
 713                 return NULL;
 714
 715         q->pport = port;
 716         q->pdev = parport_register_device(port, "c-qcam", NULL, NULL,
 717                                           NULL, 0, NULL);
 718
 719         q->bidirectional = (q->pport->modes & PARPORT_MODE_TRISTATE)?1:0;
 720
 721         if (q->pdev == NULL)
 722         {
 723                 printk(KERN_ERR "c-qcam: couldn't register for %s.\n",
 724                        port->name);
 725                 kfree(q);
 726                 return NULL;
 727         }
 728
 729         memcpy(&q->vdev, &qcam_template, sizeof(qcam_template));
 730
 731         mutex_init(&q->lock);
 732         q->width = q->ccd_width = 320;
 733         q->height = q->ccd_height = 240;
 734         q->mode = QC_MILLIONS | QC_DECIMATION_1;
 735         q->contrast = 192;
 736         q->brightness = 240;
 737         q->whitebal = 128;
 738         q->top = 1;
 739         q->left = 14;
 740         return q;
 741 }
 742
 743 static struct qcam_device *qcams[MAX_CAMS];
 744 static unsigned int num_cams = 0;
 745
 746 static int init_cqcam(struct parport *port)
 747 {
 748         struct qcam_device *qcam;
 749
 750         if (parport[0] != -1)
 751         {
 752                 /* The user gave specific instructions */
 753                 int i, found = 0;
 754                 for (i = 0; i < MAX_CAMS && parport[i] != -1; i++)
 755                 {
 756                         if (parport[0] == port->number)
 757                                 found = 1;
 758                 }
 759                 if (!found)
 760                         return -ENODEV;
 761         }
 762
 763         if (num_cams == MAX_CAMS)
 764                 return -ENOSPC;
 765
 766         qcam = qcam_init(port);
 767         if (qcam==NULL)
 768                 return -ENODEV;
 769
 770         parport_claim_or_block(qcam->pdev);
 771
 772         qc_reset(qcam);
 773
 774         if (probe && qc_detect(qcam)==0)
 775         {
 776                 parport_release(qcam->pdev);
 777                 parport_unregister_device(qcam->pdev);
 778                 kfree(qcam);
 779                 return -ENODEV;
 780         }
 781
 782         qc_setup(qcam);
 783
 784         parport_release(qcam->pdev);
 785
 786         if (video_register_device(&qcam->vdev, VFL_TYPE_GRABBER, video_nr)==-1)
 787         {
 788                 printk(KERN_ERR "Unable to register Colour QuickCam on %s\n",
 789                        qcam->pport->name);
 790                 parport_unregister_device(qcam->pdev);
 791                 kfree(qcam);
 792                 return -ENODEV;
 793         }
 794
 795         printk(KERN_INFO "video%d: Colour QuickCam found on %s\n",
 796                qcam->vdev.minor, qcam->pport->name);
 797
 798         qcams[num_cams++] = qcam;
 799
 800         return 0;
 801 }
 802
 803 static void close_cqcam(struct qcam_device *qcam)
 804 {
 805         video_unregister_device(&qcam->vdev);
 806         parport_unregister_device(qcam->pdev);
 807         kfree(qcam);
 808 }
 809
 810 static void cq_attach(struct parport *port)
 811 {
 812         init_cqcam(port);
 813 }
 814
 815 static void cq_detach(struct parport *port)
 816 {
 817         /* Write this some day. */
 818 }
 819
 820 static struct parport_driver cqcam_driver = {
 821         .name = "cqcam",
 822         .attach = cq_attach,
 823         .detach = cq_detach,
 824 };
 825
 826 static int __init cqcam_init (void)
 827 {
 828         printk(BANNER "\n");
 829
 830         return parport_register_driver(&cqcam_driver);
 831 }
 832
 833 static void __exit cqcam_cleanup (void)
 834 {
 835         unsigned int i;
 836
 837         for (i = 0; i < num_cams; i++)
 838                 close_cqcam(qcams[i]);
 839
 840         parport_unregister_driver(&cqcam_driver);
 841 }
 842
 843 MODULE_AUTHOR("Philip Blundell <philb@gnu.org>");
 844 MODULE_DESCRIPTION(BANNER);
 845 MODULE_LICENSE("GPL");
 846
 847 /* FIXME: parport=auto would never have worked, surely? --RR */
 848 MODULE_PARM_DESC(parport ,"parport=<auto|n[,n]...> for port detection method\n\
 849 probe=<0|1|2> for camera detection method\n\
 850 force_rgb=<0|1> for RGB data format (default BGR)");
 851 module_param_array(parport, int, NULL, 0);
 852 module_param(probe, int, 0);
 853 module_param(force_rgb, bool, 0);
 854 module_param(video_nr, int, 0);
 855
 856 module_init(cqcam_init);
 857 module_exit(cqcam_cleanup);