drivers/media/parport/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/mutex.h>
  37 #include <linux/jiffies.h>
  38 #include <linux/videodev2.h>
  39 #include <asm/uaccess.h>
  40 #include <media/v4l2-device.h>
  41 #include <media/v4l2-common.h>
  42 #include <media/v4l2-ioctl.h>
  43 #include <media/v4l2-fh.h>
  44 #include <media/v4l2-ctrls.h>
  45 #include <media/v4l2-event.h>
  46
  47 struct qcam {
  48         struct v4l2_device v4l2_dev;
  49         struct video_device vdev;
  50         struct v4l2_ctrl_handler hdl;
  51         struct pardevice *pdev;
  52         struct parport *pport;
  53         int width, height;
  54         int ccd_width, ccd_height;
  55         int mode;
  56         int contrast, brightness, whitebal;
  57         int top, left;
  58         unsigned int bidirectional;
  59         struct mutex lock;
  60 };
  61
  62 /* cameras maximum */
  63 #define MAX_CAMS 4
  64
  65 /* The three possible QuickCam modes */
  66 #define QC_MILLIONS     0x18
  67 #define QC_BILLIONS     0x10
  68 #define QC_THOUSANDS    0x08    /* with VIDEC compression (not supported) */
  69
  70 /* The three possible decimations */
  71 #define QC_DECIMATION_1         0
  72 #define QC_DECIMATION_2         2
  73 #define QC_DECIMATION_4         4
  74
  75 #define BANNER "Colour QuickCam for Video4Linux v0.06"
  76
  77 static int parport[MAX_CAMS] = { [1 ... MAX_CAMS-1] = -1 };
  78 static int probe = 2;
  79 static bool force_rgb;
  80 static int video_nr = -1;
  81
  82 /* FIXME: parport=auto would never have worked, surely? --RR */
  83 MODULE_PARM_DESC(parport, "parport=<auto|n[,n]...> for port detection method\n"
  84                           "probe=<0|1|2> for camera detection method\n"
  85                           "force_rgb=<0|1> for RGB data format (default BGR)");
  86 module_param_array(parport, int, NULL, 0);
  87 module_param(probe, int, 0);
  88 module_param(force_rgb, bool, 0);
  89 module_param(video_nr, int, 0);
  90
  91 static struct qcam *qcams[MAX_CAMS];
  92 static unsigned int num_cams;
  93
  94 static inline void qcam_set_ack(struct qcam *qcam, unsigned int i)
  95 {
  96         /* note: the QC specs refer to the PCAck pin by voltage, not
  97            software level.  PC ports have builtin inverters. */
  98         parport_frob_control(qcam->pport, 8, i ? 8 : 0);
  99 }
 100
 101 static inline unsigned int qcam_ready1(struct qcam *qcam)
 102 {
 103         return (parport_read_status(qcam->pport) & 0x8) ? 1 : 0;
 104 }
 105
 106 static inline unsigned int qcam_ready2(struct qcam *qcam)
 107 {
 108         return (parport_read_data(qcam->pport) & 0x1) ? 1 : 0;
 109 }
 110
 111 static unsigned int qcam_await_ready1(struct qcam *qcam, int value)
 112 {
 113         struct v4l2_device *v4l2_dev = &qcam->v4l2_dev;
 114         unsigned long oldjiffies = jiffies;
 115         unsigned int i;
 116
 117         for (oldjiffies = jiffies;
 118              time_before(jiffies, oldjiffies + msecs_to_jiffies(40));)
 119                 if (qcam_ready1(qcam) == value)
 120                         return 0;
 121
 122         /* If the camera didn't respond within 1/25 second, poll slowly
 123            for a while. */
 124         for (i = 0; i < 50; i++) {
 125                 if (qcam_ready1(qcam) == value)
 126                         return 0;
 127                 msleep_interruptible(100);
 128         }
 129
 130         /* Probably somebody pulled the plug out.  Not much we can do. */
 131         v4l2_err(v4l2_dev, "ready1 timeout (%d) %x %x\n", value,
 132                parport_read_status(qcam->pport),
 133                parport_read_control(qcam->pport));
 134         return 1;
 135 }
 136
 137 static unsigned int qcam_await_ready2(struct qcam *qcam, int value)
 138 {
 139         struct v4l2_device *v4l2_dev = &qcam->v4l2_dev;
 140         unsigned long oldjiffies = jiffies;
 141         unsigned int i;
 142
 143         for (oldjiffies = jiffies;
 144              time_before(jiffies, oldjiffies + msecs_to_jiffies(40));)
 145                 if (qcam_ready2(qcam) == value)
 146                         return 0;
 147
 148         /* If the camera didn't respond within 1/25 second, poll slowly
 149            for a while. */
 150         for (i = 0; i < 50; i++) {
 151                 if (qcam_ready2(qcam) == value)
 152                         return 0;
 153                 msleep_interruptible(100);
 154         }
 155
 156         /* Probably somebody pulled the plug out.  Not much we can do. */
 157         v4l2_err(v4l2_dev, "ready2 timeout (%d) %x %x %x\n", value,
 158                parport_read_status(qcam->pport),
 159                parport_read_control(qcam->pport),
 160                parport_read_data(qcam->pport));
 161         return 1;
 162 }
 163
 164 static int qcam_read_data(struct qcam *qcam)
 165 {
 166         unsigned int idata;
 167
 168         qcam_set_ack(qcam, 0);
 169         if (qcam_await_ready1(qcam, 1))
 170                 return -1;
 171         idata = parport_read_status(qcam->pport) & 0xf0;
 172         qcam_set_ack(qcam, 1);
 173         if (qcam_await_ready1(qcam, 0))
 174                 return -1;
 175         idata |= parport_read_status(qcam->pport) >> 4;
 176         return idata;
 177 }
 178
 179 static int qcam_write_data(struct qcam *qcam, unsigned int data)
 180 {
 181         struct v4l2_device *v4l2_dev = &qcam->v4l2_dev;
 182         unsigned int idata;
 183
 184         parport_write_data(qcam->pport, data);
 185         idata = qcam_read_data(qcam);
 186         if (data != idata) {
 187                 v4l2_warn(v4l2_dev, "sent %x but received %x\n", data,
 188                        idata);
 189                 return 1;
 190         }
 191         return 0;
 192 }
 193
 194 static inline int qcam_set(struct qcam *qcam, unsigned int cmd, unsigned int data)
 195 {
 196         if (qcam_write_data(qcam, cmd))
 197                 return -1;
 198         if (qcam_write_data(qcam, data))
 199                 return -1;
 200         return 0;
 201 }
 202
 203 static inline int qcam_get(struct qcam *qcam, unsigned int cmd)
 204 {
 205         if (qcam_write_data(qcam, cmd))
 206                 return -1;
 207         return qcam_read_data(qcam);
 208 }
 209
 210 static int qc_detect(struct qcam *qcam)
 211 {
 212         unsigned int stat, ostat, i, count = 0;
 213
 214         /* The probe routine below is not very reliable.  The IEEE-1284
 215            probe takes precedence. */
 216         /* XXX Currently parport provides no way to distinguish between
 217            "the IEEE probe was not done" and "the probe was done, but
 218            no device was found".  Fix this one day. */
 219         if (qcam->pport->probe_info[0].class == PARPORT_CLASS_MEDIA
 220             && qcam->pport->probe_info[0].model
 221             && !strcmp(qcam->pdev->port->probe_info[0].model,
 222                        "Color QuickCam 2.0")) {
 223                 printk(KERN_DEBUG "QuickCam: Found by IEEE1284 probe.\n");
 224                 return 1;
 225         }
 226
 227         if (probe < 2)
 228                 return 0;
 229
 230         parport_write_control(qcam->pport, 0xc);
 231
 232         /* look for a heartbeat */
 233         ostat = stat = parport_read_status(qcam->pport);
 234         for (i = 0; i < 250; i++) {
 235                 mdelay(1);
 236                 stat = parport_read_status(qcam->pport);
 237                 if (ostat != stat) {
 238                         if (++count >= 3)
 239                                 return 1;
 240                         ostat = stat;
 241                 }
 242         }
 243
 244         /* Reset the camera and try again */
 245         parport_write_control(qcam->pport, 0xc);
 246         parport_write_control(qcam->pport, 0x8);
 247         mdelay(1);
 248         parport_write_control(qcam->pport, 0xc);
 249         mdelay(1);
 250         count = 0;
 251
 252         ostat = stat = parport_read_status(qcam->pport);
 253         for (i = 0; i < 250; i++) {
 254                 mdelay(1);
 255                 stat = parport_read_status(qcam->pport);
 256                 if (ostat != stat) {
 257                         if (++count >= 3)
 258                                 return 1;
 259                         ostat = stat;
 260                 }
 261         }
 262
 263         /* no (or flatline) camera, give up */
 264         return 0;
 265 }
 266
 267 static void qc_reset(struct qcam *qcam)
 268 {
 269         parport_write_control(qcam->pport, 0xc);
 270         parport_write_control(qcam->pport, 0x8);
 271         mdelay(1);
 272         parport_write_control(qcam->pport, 0xc);
 273         mdelay(1);
 274 }
 275
 276 /* Reset the QuickCam and program for brightness, contrast,
 277  * white-balance, and resolution. */
 278
 279 static void qc_setup(struct qcam *qcam)
 280 {
 281         qc_reset(qcam);
 282
 283         /* Set the brightness. */
 284         qcam_set(qcam, 11, qcam->brightness);
 285
 286         /* Set the height and width.  These refer to the actual
 287            CCD area *before* applying the selected decimation.  */
 288         qcam_set(qcam, 17, qcam->ccd_height);
 289         qcam_set(qcam, 19, qcam->ccd_width / 2);
 290
 291         /* Set top and left.  */
 292         qcam_set(qcam, 0xd, qcam->top);
 293         qcam_set(qcam, 0xf, qcam->left);
 294
 295         /* Set contrast and white balance.  */
 296         qcam_set(qcam, 0x19, qcam->contrast);
 297         qcam_set(qcam, 0x1f, qcam->whitebal);
 298
 299         /* Set the speed.  */
 300         qcam_set(qcam, 45, 2);
 301 }
 302
 303 /* Read some bytes from the camera and put them in the buffer.
 304    nbytes should be a multiple of 3, because bidirectional mode gives
 305    us three bytes at a time.  */
 306
 307 static unsigned int qcam_read_bytes(struct qcam *qcam, unsigned char *buf, unsigned int nbytes)
 308 {
 309         unsigned int bytes = 0;
 310
 311         qcam_set_ack(qcam, 0);
 312         if (qcam->bidirectional) {
 313                 /* It's a bidirectional port */
 314                 while (bytes < nbytes) {
 315                         unsigned int lo1, hi1, lo2, hi2;
 316                         unsigned char r, g, b;
 317
 318                         if (qcam_await_ready2(qcam, 1))
 319                                 return bytes;
 320                         lo1 = parport_read_data(qcam->pport) >> 1;
 321                         hi1 = ((parport_read_status(qcam->pport) >> 3) & 0x1f) ^ 0x10;
 322                         qcam_set_ack(qcam, 1);
 323                         if (qcam_await_ready2(qcam, 0))
 324                                 return bytes;
 325                         lo2 = parport_read_data(qcam->pport) >> 1;
 326                         hi2 = ((parport_read_status(qcam->pport) >> 3) & 0x1f) ^ 0x10;
 327                         qcam_set_ack(qcam, 0);
 328                         r = lo1 | ((hi1 & 1) << 7);
 329                         g = ((hi1 & 0x1e) << 3) | ((hi2 & 0x1e) >> 1);
 330                         b = lo2 | ((hi2 & 1) << 7);
 331                         if (force_rgb) {
 332                                 buf[bytes++] = r;
 333                                 buf[bytes++] = g;
 334                                 buf[bytes++] = b;
 335                         } else {
 336                                 buf[bytes++] = b;
 337                                 buf[bytes++] = g;
 338                                 buf[bytes++] = r;
 339                         }
 340                 }
 341         } else {
 342                 /* It's a unidirectional port */
 343                 int i = 0, n = bytes;
 344                 unsigned char rgb[3];
 345
 346                 while (bytes < nbytes) {
 347                         unsigned int hi, lo;
 348
 349                         if (qcam_await_ready1(qcam, 1))
 350                                 return bytes;
 351                         hi = (parport_read_status(qcam->pport) & 0xf0);
 352                         qcam_set_ack(qcam, 1);
 353                         if (qcam_await_ready1(qcam, 0))
 354                                 return bytes;
 355                         lo = (parport_read_status(qcam->pport) & 0xf0);
 356                         qcam_set_ack(qcam, 0);
 357                         /* flip some bits */
 358                         rgb[(i = bytes++ % 3)] = (hi | (lo >> 4)) ^ 0x88;
 359                         if (i >= 2) {
 360 get_fragment:
 361                                 if (force_rgb) {
 362                                         buf[n++] = rgb[0];
 363                                         buf[n++] = rgb[1];
 364                                         buf[n++] = rgb[2];
 365                                 } else {
 366                                         buf[n++] = rgb[2];
 367                                         buf[n++] = rgb[1];
 368                                         buf[n++] = rgb[0];
 369                                 }
 370                         }
 371                 }
 372                 if (i) {
 373                         i = 0;
 374                         goto get_fragment;
 375                 }
 376         }
 377         return bytes;
 378 }
 379
 380 #define BUFSZ   150
 381
 382 static long qc_capture(struct qcam *qcam, char __user *buf, unsigned long len)
 383 {
 384         struct v4l2_device *v4l2_dev = &qcam->v4l2_dev;
 385         unsigned lines, pixelsperline;
 386         unsigned int is_bi_dir = qcam->bidirectional;
 387         size_t wantlen, outptr = 0;
 388         char tmpbuf[BUFSZ];
 389
 390         if (!access_ok(VERIFY_WRITE, buf, len))
 391                 return -EFAULT;
 392
 393         /* Wait for camera to become ready */
 394         for (;;) {
 395                 int i = qcam_get(qcam, 41);
 396
 397                 if (i == -1) {
 398                         qc_setup(qcam);
 399                         return -EIO;
 400                 }
 401                 if ((i & 0x80) == 0)
 402                         break;
 403                 schedule();
 404         }
 405
 406         if (qcam_set(qcam, 7, (qcam->mode | (is_bi_dir ? 1 : 0)) + 1))
 407                 return -EIO;
 408
 409         lines = qcam->height;
 410         pixelsperline = qcam->width;
 411
 412         if (is_bi_dir) {
 413                 /* Turn the port around */
 414                 parport_data_reverse(qcam->pport);
 415                 mdelay(3);
 416                 qcam_set_ack(qcam, 0);
 417                 if (qcam_await_ready1(qcam, 1)) {
 418                         qc_setup(qcam);
 419                         return -EIO;
 420                 }
 421                 qcam_set_ack(qcam, 1);
 422                 if (qcam_await_ready1(qcam, 0)) {
 423                         qc_setup(qcam);
 424                         return -EIO;
 425                 }
 426         }
 427
 428         wantlen = lines * pixelsperline * 24 / 8;
 429
 430         while (wantlen) {
 431                 size_t t, s;
 432
 433                 s = (wantlen > BUFSZ) ? BUFSZ : wantlen;
 434                 t = qcam_read_bytes(qcam, tmpbuf, s);
 435                 if (outptr < len) {
 436                         size_t sz = len - outptr;
 437
 438                         if (sz > t)
 439                                 sz = t;
 440                         if (__copy_to_user(buf + outptr, tmpbuf, sz))
 441                                 break;
 442                         outptr += sz;
 443                 }
 444                 wantlen -= t;
 445                 if (t < s)
 446                         break;
 447                 cond_resched();
 448         }
 449
 450         len = outptr;
 451
 452         if (wantlen) {
 453                 v4l2_err(v4l2_dev, "short read.\n");
 454                 if (is_bi_dir)
 455                         parport_data_forward(qcam->pport);
 456                 qc_setup(qcam);
 457                 return len;
 458         }
 459
 460         if (is_bi_dir) {
 461                 int l;
 462
 463                 do {
 464                         l = qcam_read_bytes(qcam, tmpbuf, 3);
 465                         cond_resched();
 466                 } while (l && (tmpbuf[0] == 0x7e || tmpbuf[1] == 0x7e || tmpbuf[2] == 0x7e));
 467                 if (force_rgb) {
 468                         if (tmpbuf[0] != 0xe || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xf)
 469                                 v4l2_err(v4l2_dev, "bad EOF\n");
 470                 } else {
 471                         if (tmpbuf[0] != 0xf || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xe)
 472                                 v4l2_err(v4l2_dev, "bad EOF\n");
 473                 }
 474                 qcam_set_ack(qcam, 0);
 475                 if (qcam_await_ready1(qcam, 1)) {
 476                         v4l2_err(v4l2_dev, "no ack after EOF\n");
 477                         parport_data_forward(qcam->pport);
 478                         qc_setup(qcam);
 479                         return len;
 480                 }
 481                 parport_data_forward(qcam->pport);
 482                 mdelay(3);
 483                 qcam_set_ack(qcam, 1);
 484                 if (qcam_await_ready1(qcam, 0)) {
 485                         v4l2_err(v4l2_dev, "no ack to port turnaround\n");
 486                         qc_setup(qcam);
 487                         return len;
 488                 }
 489         } else {
 490                 int l;
 491
 492                 do {
 493                         l = qcam_read_bytes(qcam, tmpbuf, 1);
 494                         cond_resched();
 495                 } while (l && tmpbuf[0] == 0x7e);
 496                 l = qcam_read_bytes(qcam, tmpbuf + 1, 2);
 497                 if (force_rgb) {
 498                         if (tmpbuf[0] != 0xe || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xf)
 499                                 v4l2_err(v4l2_dev, "bad EOF\n");
 500                 } else {
 501                         if (tmpbuf[0] != 0xf || tmpbuf[1] != 0x0 || tmpbuf[2] != 0xe)
 502                                 v4l2_err(v4l2_dev, "bad EOF\n");
 503                 }
 504         }
 505
 506         qcam_write_data(qcam, 0);
 507         return len;
 508 }
 509
 510 /*
 511  *      Video4linux interfacing
 512  */
 513
 514 static int qcam_querycap(struct file *file, void  *priv,
 515                                         struct v4l2_capability *vcap)
 516 {
 517         struct qcam *qcam = video_drvdata(file);
 518
 519         strlcpy(vcap->driver, qcam->v4l2_dev.name, sizeof(vcap->driver));
 520         strlcpy(vcap->card, "Color Quickcam", sizeof(vcap->card));
 521         strlcpy(vcap->bus_info, "parport", sizeof(vcap->bus_info));
 522         vcap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE;
 523         vcap->capabilities = vcap->device_caps | V4L2_CAP_DEVICE_CAPS;
 524         return 0;
 525 }
 526
 527 static int qcam_enum_input(struct file *file, void *fh, struct v4l2_input *vin)
 528 {
 529         if (vin->index > 0)
 530                 return -EINVAL;
 531         strlcpy(vin->name, "Camera", sizeof(vin->name));
 532         vin->type = V4L2_INPUT_TYPE_CAMERA;
 533         vin->audioset = 0;
 534         vin->tuner = 0;
 535         vin->std = 0;
 536         vin->status = 0;
 537         return 0;
 538 }
 539
 540 static int qcam_g_input(struct file *file, void *fh, unsigned int *inp)
 541 {
 542         *inp = 0;
 543         return 0;
 544 }
 545
 546 static int qcam_s_input(struct file *file, void *fh, unsigned int inp)
 547 {
 548         return (inp > 0) ? -EINVAL : 0;
 549 }
 550
 551 static int qcam_g_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
 552 {
 553         struct qcam *qcam = video_drvdata(file);
 554         struct v4l2_pix_format *pix = &fmt->fmt.pix;
 555
 556         pix->width = qcam->width;
 557         pix->height = qcam->height;
 558         pix->pixelformat = V4L2_PIX_FMT_RGB24;
 559         pix->field = V4L2_FIELD_NONE;
 560         pix->bytesperline = 3 * qcam->width;
 561         pix->sizeimage = 3 * qcam->width * qcam->height;
 562         /* Just a guess */
 563         pix->colorspace = V4L2_COLORSPACE_SRGB;
 564         return 0;
 565 }
 566
 567 static int qcam_try_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
 568 {
 569         struct v4l2_pix_format *pix = &fmt->fmt.pix;
 570
 571         if (pix->height < 60 || pix->width < 80) {
 572                 pix->height = 60;
 573                 pix->width = 80;
 574         } else if (pix->height < 120 || pix->width < 160) {
 575                 pix->height = 120;
 576                 pix->width = 160;
 577         } else {
 578                 pix->height = 240;
 579                 pix->width = 320;
 580         }
 581         pix->pixelformat = V4L2_PIX_FMT_RGB24;
 582         pix->field = V4L2_FIELD_NONE;
 583         pix->bytesperline = 3 * pix->width;
 584         pix->sizeimage = 3 * pix->width * pix->height;
 585         /* Just a guess */
 586         pix->colorspace = V4L2_COLORSPACE_SRGB;
 587         return 0;
 588 }
 589
 590 static int qcam_s_fmt_vid_cap(struct file *file, void *fh, struct v4l2_format *fmt)
 591 {
 592         struct qcam *qcam = video_drvdata(file);
 593         struct v4l2_pix_format *pix = &fmt->fmt.pix;
 594         int ret = qcam_try_fmt_vid_cap(file, fh, fmt);
 595
 596         if (ret)
 597                 return ret;
 598         switch (pix->height) {
 599         case 60:
 600                 qcam->mode = QC_DECIMATION_4;
 601                 break;
 602         case 120:
 603                 qcam->mode = QC_DECIMATION_2;
 604                 break;
 605         default:
 606                 qcam->mode = QC_DECIMATION_1;
 607                 break;
 608         }
 609
 610         mutex_lock(&qcam->lock);
 611         qcam->mode |= QC_MILLIONS;
 612         qcam->height = pix->height;
 613         qcam->width = pix->width;
 614         parport_claim_or_block(qcam->pdev);
 615         qc_setup(qcam);
 616         parport_release(qcam->pdev);
 617         mutex_unlock(&qcam->lock);
 618         return 0;
 619 }
 620
 621 static int qcam_enum_fmt_vid_cap(struct file *file, void *fh, struct v4l2_fmtdesc *fmt)
 622 {
 623         static struct v4l2_fmtdesc formats[] = {
 624                 { 0, 0, 0,
 625                   "RGB 8:8:8", V4L2_PIX_FMT_RGB24,
 626                   { 0, 0, 0, 0 }
 627                 },
 628         };
 629         enum v4l2_buf_type type = fmt->type;
 630
 631         if (fmt->index > 0)
 632                 return -EINVAL;
 633
 634         *fmt = formats[fmt->index];
 635         fmt->type = type;
 636         return 0;
 637 }
 638
 639 static ssize_t qcam_read(struct file *file, char __user *buf,
 640                          size_t count, loff_t *ppos)
 641 {
 642         struct qcam *qcam = video_drvdata(file);
 643         int len;
 644
 645         mutex_lock(&qcam->lock);
 646         parport_claim_or_block(qcam->pdev);
 647         /* Probably should have a semaphore against multiple users */
 648         len = qc_capture(qcam, buf, count);
 649         parport_release(qcam->pdev);
 650         mutex_unlock(&qcam->lock);
 651         return len;
 652 }
 653
 654 static int qcam_s_ctrl(struct v4l2_ctrl *ctrl)
 655 {
 656         struct qcam *qcam =
 657                 container_of(ctrl->handler, struct qcam, hdl);
 658         int ret = 0;
 659
 660         mutex_lock(&qcam->lock);
 661         switch (ctrl->id) {
 662         case V4L2_CID_BRIGHTNESS:
 663                 qcam->brightness = ctrl->val;
 664                 break;
 665         case V4L2_CID_CONTRAST:
 666                 qcam->contrast = ctrl->val;
 667                 break;
 668         case V4L2_CID_GAMMA:
 669                 qcam->whitebal = ctrl->val;
 670                 break;
 671         default:
 672                 ret = -EINVAL;
 673                 break;
 674         }
 675         if (ret == 0) {
 676                 parport_claim_or_block(qcam->pdev);
 677                 qc_setup(qcam);
 678                 parport_release(qcam->pdev);
 679         }
 680         mutex_unlock(&qcam->lock);
 681         return ret;
 682 }
 683
 684 static const struct v4l2_file_operations qcam_fops = {
 685         .owner          = THIS_MODULE,
 686         .open           = v4l2_fh_open,
 687         .release        = v4l2_fh_release,
 688         .poll           = v4l2_ctrl_poll,
 689         .unlocked_ioctl = video_ioctl2,
 690         .read           = qcam_read,
 691 };
 692
 693 static const struct v4l2_ioctl_ops qcam_ioctl_ops = {
 694         .vidioc_querycap                    = qcam_querycap,
 695         .vidioc_g_input                     = qcam_g_input,
 696         .vidioc_s_input                     = qcam_s_input,
 697         .vidioc_enum_input                  = qcam_enum_input,
 698         .vidioc_enum_fmt_vid_cap            = qcam_enum_fmt_vid_cap,
 699         .vidioc_g_fmt_vid_cap               = qcam_g_fmt_vid_cap,
 700         .vidioc_s_fmt_vid_cap               = qcam_s_fmt_vid_cap,
 701         .vidioc_try_fmt_vid_cap             = qcam_try_fmt_vid_cap,
 702         .vidioc_log_status                  = v4l2_ctrl_log_status,
 703         .vidioc_subscribe_event             = v4l2_ctrl_subscribe_event,
 704         .vidioc_unsubscribe_event           = v4l2_event_unsubscribe,
 705 };
 706
 707 static const struct v4l2_ctrl_ops qcam_ctrl_ops = {
 708         .s_ctrl = qcam_s_ctrl,
 709 };
 710
 711 /* Initialize the QuickCam driver control structure. */
 712
 713 static struct qcam *qcam_init(struct parport *port)
 714 {
 715         struct qcam *qcam;
 716         struct v4l2_device *v4l2_dev;
 717
 718         qcam = kzalloc(sizeof(*qcam), GFP_KERNEL);
 719         if (qcam == NULL)
 720                 return NULL;
 721
 722         v4l2_dev = &qcam->v4l2_dev;
 723         strlcpy(v4l2_dev->name, "c-qcam", sizeof(v4l2_dev->name));
 724
 725         if (v4l2_device_register(NULL, v4l2_dev) < 0) {
 726                 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 727                 kfree(qcam);
 728                 return NULL;
 729         }
 730
 731         v4l2_ctrl_handler_init(&qcam->hdl, 3);
 732         v4l2_ctrl_new_std(&qcam->hdl, &qcam_ctrl_ops,
 733                           V4L2_CID_BRIGHTNESS, 0, 255, 1, 240);
 734         v4l2_ctrl_new_std(&qcam->hdl, &qcam_ctrl_ops,
 735                           V4L2_CID_CONTRAST, 0, 255, 1, 192);
 736         v4l2_ctrl_new_std(&qcam->hdl, &qcam_ctrl_ops,
 737                           V4L2_CID_GAMMA, 0, 255, 1, 128);
 738         if (qcam->hdl.error) {
 739                 v4l2_err(v4l2_dev, "couldn't register controls\n");
 740                 v4l2_ctrl_handler_free(&qcam->hdl);
 741                 kfree(qcam);
 742                 return NULL;
 743         }
 744
 745         qcam->pport = port;
 746         qcam->pdev = parport_register_device(port, "c-qcam", NULL, NULL,
 747                                           NULL, 0, NULL);
 748
 749         qcam->bidirectional = (qcam->pport->modes & PARPORT_MODE_TRISTATE) ? 1 : 0;
 750
 751         if (qcam->pdev == NULL) {
 752                 v4l2_err(v4l2_dev, "couldn't register for %s.\n", port->name);
 753                 v4l2_ctrl_handler_free(&qcam->hdl);
 754                 kfree(qcam);
 755                 return NULL;
 756         }
 757
 758         strlcpy(qcam->vdev.name, "Colour QuickCam", sizeof(qcam->vdev.name));
 759         qcam->vdev.v4l2_dev = v4l2_dev;
 760         qcam->vdev.fops = &qcam_fops;
 761         qcam->vdev.ioctl_ops = &qcam_ioctl_ops;
 762         qcam->vdev.release = video_device_release_empty;
 763         qcam->vdev.ctrl_handler = &qcam->hdl;
 764         set_bit(V4L2_FL_USE_FH_PRIO, &qcam->vdev.flags);
 765         video_set_drvdata(&qcam->vdev, qcam);
 766
 767         mutex_init(&qcam->lock);
 768         qcam->width = qcam->ccd_width = 320;
 769         qcam->height = qcam->ccd_height = 240;
 770         qcam->mode = QC_MILLIONS | QC_DECIMATION_1;
 771         qcam->contrast = 192;
 772         qcam->brightness = 240;
 773         qcam->whitebal = 128;
 774         qcam->top = 1;
 775         qcam->left = 14;
 776         return qcam;
 777 }
 778
 779 static int init_cqcam(struct parport *port)
 780 {
 781         struct qcam *qcam;
 782         struct v4l2_device *v4l2_dev;
 783
 784         if (parport[0] != -1) {
 785                 /* The user gave specific instructions */
 786                 int i, found = 0;
 787
 788                 for (i = 0; i < MAX_CAMS && parport[i] != -1; i++) {
 789                         if (parport[0] == port->number)
 790                                 found = 1;
 791                 }
 792                 if (!found)
 793                         return -ENODEV;
 794         }
 795
 796         if (num_cams == MAX_CAMS)
 797                 return -ENOSPC;
 798
 799         qcam = qcam_init(port);
 800         if (qcam == NULL)
 801                 return -ENODEV;
 802
 803         v4l2_dev = &qcam->v4l2_dev;
 804
 805         parport_claim_or_block(qcam->pdev);
 806
 807         qc_reset(qcam);
 808
 809         if (probe && qc_detect(qcam) == 0) {
 810                 parport_release(qcam->pdev);
 811                 parport_unregister_device(qcam->pdev);
 812                 kfree(qcam);
 813                 return -ENODEV;
 814         }
 815
 816         qc_setup(qcam);
 817
 818         parport_release(qcam->pdev);
 819
 820         if (video_register_device(&qcam->vdev, VFL_TYPE_GRABBER, video_nr) < 0) {
 821                 v4l2_err(v4l2_dev, "Unable to register Colour QuickCam on %s\n",
 822                        qcam->pport->name);
 823                 parport_unregister_device(qcam->pdev);
 824                 kfree(qcam);
 825                 return -ENODEV;
 826         }
 827
 828         v4l2_info(v4l2_dev, "%s: Colour QuickCam found on %s\n",
 829                video_device_node_name(&qcam->vdev), qcam->pport->name);
 830
 831         qcams[num_cams++] = qcam;
 832
 833         return 0;
 834 }
 835
 836 static void close_cqcam(struct qcam *qcam)
 837 {
 838         video_unregister_device(&qcam->vdev);
 839         v4l2_ctrl_handler_free(&qcam->hdl);
 840         parport_unregister_device(qcam->pdev);
 841         kfree(qcam);
 842 }
 843
 844 static void cq_attach(struct parport *port)
 845 {
 846         init_cqcam(port);
 847 }
 848
 849 static void cq_detach(struct parport *port)
 850 {
 851         /* Write this some day. */
 852 }
 853
 854 static struct parport_driver cqcam_driver = {
 855         .name = "cqcam",
 856         .attach = cq_attach,
 857         .detach = cq_detach,
 858 };
 859
 860 static int __init cqcam_init(void)
 861 {
 862         printk(KERN_INFO BANNER "\n");
 863
 864         return parport_register_driver(&cqcam_driver);
 865 }
 866
 867 static void __exit cqcam_cleanup(void)
 868 {
 869         unsigned int i;
 870
 871         for (i = 0; i < num_cams; i++)
 872                 close_cqcam(qcams[i]);
 873
 874         parport_unregister_driver(&cqcam_driver);
 875 }
 876
 877 MODULE_AUTHOR("Philip Blundell <philb@gnu.org>");
 878 MODULE_DESCRIPTION(BANNER);
 879 MODULE_LICENSE("GPL");
 880 MODULE_VERSION("0.0.4");
 881
 882 module_init(cqcam_init);
 883 module_exit(cqcam_cleanup);