err.no Git - linux-2.6/blob - drivers/media/video/vivi.c

   1 /*
   2  * Virtual Video driver - This code emulates a real video device with v4l2 api
   3  *
   4  * Copyright (c) 2006 by:
   5  *      Mauro Carvalho Chehab <mchehab--a.t--infradead.org>
   6  *      Ted Walther <ted--a.t--enumera.com>
   7  *      John Sokol <sokol--a.t--videotechnology.com>
   8  *      http://v4l.videotechnology.com/
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the BSD Licence, GNU General Public License
  12  * as published by the Free Software Foundation; either version 2 of the
  13  * License, or (at your option) any later version
  14  */
  15 #include <linux/module.h>
  16 #include <linux/delay.h>
  17 #include <linux/errno.h>
  18 #include <linux/fs.h>
  19 #include <linux/kernel.h>
  20 #include <linux/slab.h>
  21 #include <linux/mm.h>
  22 #include <linux/ioport.h>
  23 #include <linux/init.h>
  24 #include <linux/sched.h>
  25 #include <linux/pci.h>
  26 #include <linux/random.h>
  27 #include <linux/version.h>
  28 #include <linux/mutex.h>
  29 #include <linux/videodev2.h>
  30 #include <linux/dma-mapping.h>
  31 #ifdef CONFIG_VIDEO_V4L1_COMPAT
  32 /* Include V4L1 specific functions. Should be removed soon */
  33 #include <linux/videodev.h>
  34 #endif
  35 #include <linux/interrupt.h>
  36 #include <media/videobuf-vmalloc.h>
  37 #include <media/v4l2-common.h>
  38 #include <linux/kthread.h>
  39 #include <linux/highmem.h>
  40 #include <linux/freezer.h>
  41
  42 /* Wake up at about 30 fps */
  43 #define WAKE_NUMERATOR 30
  44 #define WAKE_DENOMINATOR 1001
  45 #define BUFFER_TIMEOUT     msecs_to_jiffies(500)  /* 0.5 seconds */
  46
  47 #include "font.h"
  48
  49 #define VIVI_MAJOR_VERSION 0
  50 #define VIVI_MINOR_VERSION 4
  51 #define VIVI_RELEASE 0
  52 #define VIVI_VERSION \
  53         KERNEL_VERSION(VIVI_MAJOR_VERSION, VIVI_MINOR_VERSION, VIVI_RELEASE)
  54
  55 /* Declare static vars that will be used as parameters */
  56 static unsigned int vid_limit = 16;     /* Video memory limit, in Mb */
  57 static int video_nr = -1;               /* /dev/videoN, -1 for autodetect */
  58 static int n_devs = 1;                  /* Number of virtual devices */
  59
  60 /* supported controls */
  61 static struct v4l2_queryctrl vivi_qctrl[] = {
  62         {
  63                 .id            = V4L2_CID_AUDIO_VOLUME,
  64                 .name          = "Volume",
  65                 .minimum       = 0,
  66                 .maximum       = 65535,
  67                 .step          = 65535/100,
  68                 .default_value = 65535,
  69                 .flags         = 0,
  70                 .type          = V4L2_CTRL_TYPE_INTEGER,
  71         }, {
  72                 .id            = V4L2_CID_BRIGHTNESS,
  73                 .type          = V4L2_CTRL_TYPE_INTEGER,
  74                 .name          = "Brightness",
  75                 .minimum       = 0,
  76                 .maximum       = 255,
  77                 .step          = 1,
  78                 .default_value = 127,
  79                 .flags         = 0,
  80         }, {
  81                 .id            = V4L2_CID_CONTRAST,
  82                 .type          = V4L2_CTRL_TYPE_INTEGER,
  83                 .name          = "Contrast",
  84                 .minimum       = 0,
  85                 .maximum       = 255,
  86                 .step          = 0x1,
  87                 .default_value = 0x10,
  88                 .flags         = 0,
  89         }, {
  90                 .id            = V4L2_CID_SATURATION,
  91                 .type          = V4L2_CTRL_TYPE_INTEGER,
  92                 .name          = "Saturation",
  93                 .minimum       = 0,
  94                 .maximum       = 255,
  95                 .step          = 0x1,
  96                 .default_value = 127,
  97                 .flags         = 0,
  98         }, {
  99                 .id            = V4L2_CID_HUE,
 100                 .type          = V4L2_CTRL_TYPE_INTEGER,
 101                 .name          = "Hue",
 102                 .minimum       = -128,
 103                 .maximum       = 127,
 104                 .step          = 0x1,
 105                 .default_value = 0,
 106                 .flags         = 0,
 107         }
 108 };
 109
 110 static int qctl_regs[ARRAY_SIZE(vivi_qctrl)];
 111
 112 #define dprintk(dev, level, fmt, arg...)                                \
 113         do {                                                            \
 114                 if (dev->vfd->debug >= (level))                         \
 115                         printk(KERN_DEBUG "vivi: " fmt , ## arg);       \
 116         } while (0)
 117
 118 /* ------------------------------------------------------------------
 119         Basic structures
 120    ------------------------------------------------------------------*/
 121
 122 struct vivi_fmt {
 123         char  *name;
 124         u32   fourcc;          /* v4l2 format id */
 125         int   depth;
 126 };
 127
 128 static struct vivi_fmt format = {
 129         .name     = "4:2:2, packed, YUYV",
 130         .fourcc   = V4L2_PIX_FMT_YUYV,
 131         .depth    = 16,
 132 };
 133
 134 struct sg_to_addr {
 135         int pos;
 136         struct scatterlist *sg;
 137 };
 138
 139 /* buffer for one video frame */
 140 struct vivi_buffer {
 141         /* common v4l buffer stuff -- must be first */
 142         struct videobuf_buffer vb;
 143
 144         struct vivi_fmt        *fmt;
 145 };
 146
 147 struct vivi_dmaqueue {
 148         struct list_head       active;
 149         struct list_head       queued;
 150         struct timer_list      timeout;
 151
 152         /* thread for generating video stream*/
 153         struct task_struct         *kthread;
 154         wait_queue_head_t          wq;
 155         /* Counters to control fps rate */
 156         int                        frame;
 157         int                        ini_jiffies;
 158 };
 159
 160 static LIST_HEAD(vivi_devlist);
 161
 162 struct vivi_dev {
 163         struct list_head           vivi_devlist;
 164
 165         struct mutex               lock;
 166         spinlock_t                 slock;
 167         struct mutex               mutex;
 168
 169         int                        users;
 170
 171         /* various device info */
 172         struct video_device        *vfd;
 173
 174         struct vivi_dmaqueue       vidq;
 175
 176         /* Several counters */
 177         int                        h, m, s, ms;
 178         unsigned long              jiffies;
 179         char                       timestr[13];
 180
 181         int                        mv_count;    /* Controls bars movement */
 182 };
 183
 184 struct vivi_fh {
 185         struct vivi_dev            *dev;
 186
 187         /* video capture */
 188         struct vivi_fmt            *fmt;
 189         unsigned int               width, height;
 190         struct videobuf_queue      vb_vidq;
 191
 192         enum v4l2_buf_type         type;
 193 };
 194
 195 /* ------------------------------------------------------------------
 196         DMA and thread functions
 197    ------------------------------------------------------------------*/
 198
 199 /* Bars and Colors should match positions */
 200
 201 enum colors {
 202         WHITE,
 203         AMBAR,
 204         CYAN,
 205         GREEN,
 206         MAGENTA,
 207         RED,
 208         BLUE,
 209         BLACK,
 210 };
 211
 212 static u8 bars[8][3] = {
 213         /* R   G   B */
 214         {204, 204, 204},  /* white */
 215         {208, 208,   0},  /* ambar */
 216         {  0, 206, 206},  /* cyan */
 217         {  0, 239,   0},  /* green */
 218         {239,   0, 239},  /* magenta */
 219         {205,   0,   0},  /* red */
 220         {  0,   0, 255},  /* blue */
 221         {  0,   0,   0},  /* black */
 222 };
 223
 224 #define TO_Y(r, g, b) \
 225         (((16829 * r + 33039 * g + 6416 * b  + 32768) >> 16) + 16)
 226 /* RGB to  V(Cr) Color transform */
 227 #define TO_V(r, g, b) \
 228         (((28784 * r - 24103 * g - 4681 * b  + 32768) >> 16) + 128)
 229 /* RGB to  U(Cb) Color transform */
 230 #define TO_U(r, g, b) \
 231         (((-9714 * r - 19070 * g + 28784 * b + 32768) >> 16) + 128)
 232
 233 #define TSTAMP_MIN_Y 24
 234 #define TSTAMP_MAX_Y TSTAMP_MIN_Y+15
 235 #define TSTAMP_MIN_X 64
 236
 237 static void gen_line(char *basep, int inipos, int wmax,
 238                 int hmax, int line, int count, char *timestr)
 239 {
 240         int  w, i, j, y;
 241         int pos = inipos;
 242         char *p, *s;
 243         u8   chr, r, g, b, color;
 244
 245         /* We will just duplicate the second pixel at the packet */
 246         wmax /= 2;
 247
 248         /* Generate a standard color bar pattern */
 249         for (w = 0; w < wmax; w++) {
 250                 int colorpos = ((w + count) * 8/(wmax + 1)) % 8;
 251                 r = bars[colorpos][0];
 252                 g = bars[colorpos][1];
 253                 b = bars[colorpos][2];
 254
 255                 for (color = 0; color < 4; color++) {
 256                         p = basep + pos;
 257
 258                         switch (color) {
 259                         case 0:
 260                         case 2:
 261                                 *p = TO_Y(r, g, b);     /* Luma */
 262                                 break;
 263                         case 1:
 264                                 *p = TO_U(r, g, b);     /* Cb */
 265                                 break;
 266                         case 3:
 267                                 *p = TO_V(r, g, b);     /* Cr */
 268                                 break;
 269                         }
 270                         pos++;
 271                 }
 272         }
 273
 274         /* Checks if it is possible to show timestamp */
 275         if (TSTAMP_MAX_Y >= hmax)
 276                 goto end;
 277         if (TSTAMP_MIN_X + strlen(timestr) >= wmax)
 278                 goto end;
 279
 280         /* Print stream time */
 281         if (line >= TSTAMP_MIN_Y && line <= TSTAMP_MAX_Y) {
 282                 j = TSTAMP_MIN_X;
 283                 for (s = timestr; *s; s++) {
 284                         chr = rom8x16_bits[(*s-0x30)*16+line-TSTAMP_MIN_Y];
 285                         for (i = 0; i < 7; i++) {
 286                                 if (chr & 1 << (7 - i)) {
 287                                         /* Font color*/
 288                                         r = 0;
 289                                         g = 198;
 290                                         b = 0;
 291                                 } else {
 292                                         /* Background color */
 293                                         r = bars[BLACK][0];
 294                                         g = bars[BLACK][1];
 295                                         b = bars[BLACK][2];
 296                                 }
 297
 298                                 pos = inipos + j * 2;
 299                                 for (color = 0; color < 4; color++) {
 300                                         p = basep + pos;
 301
 302                                         y = TO_Y(r, g, b);
 303
 304                                         switch (color) {
 305                                         case 0:
 306                                         case 2:
 307                                                 *p = TO_Y(r, g, b); /* Luma */
 308                                                 break;
 309                                         case 1:
 310                                                 *p = TO_U(r, g, b); /* Cb */
 311                                                 break;
 312                                         case 3:
 313                                                 *p = TO_V(r, g, b); /* Cr */
 314                                                 break;
 315                                         }
 316                                         pos++;
 317                                 }
 318                                 j++;
 319                         }
 320                 }
 321         }
 322
 323 end:
 324         return;
 325 }
 326 static void vivi_fillbuff(struct vivi_dev *dev, struct vivi_buffer *buf)
 327 {
 328         int h , pos = 0;
 329         int hmax  = buf->vb.height;
 330         int wmax  = buf->vb.width;
 331         struct timeval ts;
 332         char *tmpbuf = kmalloc(wmax * 2, GFP_KERNEL);
 333         void *vbuf = videobuf_to_vmalloc(&buf->vb);
 334
 335         if (!tmpbuf)
 336                 return;
 337
 338         for (h = 0; h < hmax; h++) {
 339                 gen_line(tmpbuf, 0, wmax, hmax, h, dev->mv_count,
 340                          dev->timestr);
 341                 /* FIXME: replacing to __copy_to_user */
 342                 if (copy_to_user(vbuf + pos, tmpbuf, wmax * 2) != 0)
 343                         dprintk(dev, 2, "vivifill copy_to_user failed.\n");
 344                 pos += wmax*2;
 345         }
 346
 347         dev->mv_count++;
 348
 349         kfree(tmpbuf);
 350
 351         /* Updates stream time */
 352
 353         dev->ms += jiffies_to_msecs(jiffies-dev->jiffies);
 354         dev->jiffies = jiffies;
 355         if (dev->ms >= 1000) {
 356                 dev->ms -= 1000;
 357                 dev->s++;
 358                 if (dev->s >= 60) {
 359                         dev->s -= 60;
 360                         dev->m++;
 361                         if (dev->m > 60) {
 362                                 dev->m -= 60;
 363                                 dev->h++;
 364                                 if (dev->h > 24)
 365                                         dev->h -= 24;
 366                         }
 367                 }
 368         }
 369         sprintf(dev->timestr, "%02d:%02d:%02d:%03d",
 370                         dev->h, dev->m, dev->s, dev->ms);
 371
 372         dprintk(dev, 2, "vivifill at %s: Buffer 0x%08lx size= %d\n",
 373                         dev->timestr, (unsigned long)tmpbuf, pos);
 374
 375         /* Advice that buffer was filled */
 376         buf->vb.state = VIDEOBUF_DONE;
 377         buf->vb.field_count++;
 378         do_gettimeofday(&ts);
 379         buf->vb.ts = ts;
 380
 381         list_del(&buf->vb.queue);
 382         wake_up(&buf->vb.done);
 383 }
 384
 385 static int restart_video_queue(struct vivi_dmaqueue *dma_q);
 386
 387 static void vivi_thread_tick(struct vivi_dmaqueue  *dma_q)
 388 {
 389         struct vivi_buffer    *buf;
 390         struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
 391
 392         int bc;
 393
 394         spin_lock(&dev->slock);
 395         /* Announces videobuf that all went ok */
 396         for (bc = 0;; bc++) {
 397                 if (list_empty(&dma_q->active)) {
 398                         dprintk(dev, 1, "No active queue to serve\n");
 399                         break;
 400                 }
 401
 402                 buf = list_entry(dma_q->active.next,
 403                                  struct vivi_buffer, vb.queue);
 404
 405                 /* Nobody is waiting something to be done, just return */
 406                 if (!waitqueue_active(&buf->vb.done)) {
 407                         mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
 408                         spin_unlock(&dev->slock);
 409                         return;
 410                 }
 411
 412                 do_gettimeofday(&buf->vb.ts);
 413                 dprintk(dev, 2, "[%p/%d] wakeup\n", buf, buf->vb. i);
 414
 415                 /* Fill buffer */
 416                 vivi_fillbuff(dev, buf);
 417
 418                 if (list_empty(&dma_q->active)) {
 419                         del_timer(&dma_q->timeout);
 420                 } else {
 421                         mod_timer(&dma_q->timeout, jiffies + BUFFER_TIMEOUT);
 422                 }
 423         }
 424         if (bc != 1)
 425                 dprintk(dev, 1, "%s: %d buffers handled (should be 1)\n",
 426                         __FUNCTION__, bc);
 427         spin_unlock(&dev->slock);
 428 }
 429
 430 #define frames_to_ms(frames)                                    \
 431         ((frames * WAKE_NUMERATOR * 1000) / WAKE_DENOMINATOR)
 432
 433 static void vivi_sleep(struct vivi_dmaqueue  *dma_q)
 434 {
 435         struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
 436         int timeout, running_time;
 437         DECLARE_WAITQUEUE(wait, current);
 438
 439         dprintk(dev, 1, "%s dma_q=0x%08lx\n", __FUNCTION__,
 440                 (unsigned long)dma_q);
 441
 442         add_wait_queue(&dma_q->wq, &wait);
 443         if (kthread_should_stop())
 444                 goto stop_task;
 445
 446         running_time = jiffies - dma_q->ini_jiffies;
 447         dma_q->frame++;
 448
 449         /* Calculate time to wake up */
 450         timeout = msecs_to_jiffies(frames_to_ms(dma_q->frame)) - running_time;
 451
 452         if (timeout > msecs_to_jiffies(frames_to_ms(2)) || timeout <= 0) {
 453                 int old = dma_q->frame;
 454                 int nframes;
 455
 456                 dma_q->frame = (jiffies_to_msecs(running_time) /
 457                                frames_to_ms(1)) + 1;
 458
 459                 timeout = msecs_to_jiffies(frames_to_ms(dma_q->frame))
 460                           - running_time;
 461
 462                 if (unlikely (timeout <= 0))
 463                         timeout = 1;
 464
 465                 nframes = (dma_q->frame > old)?
 466                                   dma_q->frame - old : old - dma_q->frame;
 467
 468                 dprintk(dev, 1, "%ld: %s %d frames. "
 469                         "Current frame is %d. Will sleep for %d jiffies\n",
 470                         jiffies,
 471                         (dma_q->frame > old)? "Underrun, losed" : "Overrun of",
 472                         nframes, dma_q->frame, timeout);
 473         } else
 474                 dprintk(dev, 1, "will sleep for %d jiffies\n", timeout);
 475
 476         vivi_thread_tick(dma_q);
 477
 478         schedule_timeout_interruptible(timeout);
 479
 480 stop_task:
 481         remove_wait_queue(&dma_q->wq, &wait);
 482         try_to_freeze();
 483 }
 484
 485 static int vivi_thread(void *data)
 486 {
 487         struct vivi_dmaqueue  *dma_q = data;
 488         struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
 489
 490         dprintk(dev, 1, "thread started\n");
 491
 492         mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
 493         set_freezable();
 494
 495         for (;;) {
 496                 vivi_sleep(dma_q);
 497
 498                 if (kthread_should_stop())
 499                         break;
 500         }
 501         dprintk(dev, 1, "thread: exit\n");
 502         return 0;
 503 }
 504
 505 static int vivi_start_thread(struct vivi_dmaqueue  *dma_q)
 506 {
 507         struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
 508
 509         dma_q->frame = 0;
 510         dma_q->ini_jiffies = jiffies;
 511
 512         dprintk(dev, 1, "%s\n", __FUNCTION__);
 513
 514         dma_q->kthread = kthread_run(vivi_thread, dma_q, "vivi");
 515
 516         if (IS_ERR(dma_q->kthread)) {
 517                 printk(KERN_ERR "vivi: kernel_thread() failed\n");
 518                 return PTR_ERR(dma_q->kthread);
 519         }
 520         /* Wakes thread */
 521         wake_up_interruptible(&dma_q->wq);
 522
 523         dprintk(dev, 1, "returning from %s\n", __FUNCTION__);
 524         return 0;
 525 }
 526
 527 static void vivi_stop_thread(struct vivi_dmaqueue  *dma_q)
 528 {
 529         struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
 530
 531         dprintk(dev, 1, "%s\n", __FUNCTION__);
 532         /* shutdown control thread */
 533         if (dma_q->kthread) {
 534                 kthread_stop(dma_q->kthread);
 535                 dma_q->kthread = NULL;
 536         }
 537 }
 538
 539 static int restart_video_queue(struct vivi_dmaqueue *dma_q)
 540 {
 541         struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
 542         struct vivi_buffer *buf, *prev;
 543
 544         dprintk(dev, 1, "%s dma_q=0x%08lx\n", __FUNCTION__,
 545                 (unsigned long)dma_q);
 546
 547         if (!list_empty(&dma_q->active)) {
 548                 buf = list_entry(dma_q->active.next,
 549                                  struct vivi_buffer, vb.queue);
 550                 dprintk(dev, 2, "restart_queue [%p/%d]: restart dma\n",
 551                         buf, buf->vb.i);
 552
 553                 dprintk(dev, 1, "Restarting video dma\n");
 554                 vivi_stop_thread(dma_q);
 555
 556                 /* cancel all outstanding capture / vbi requests */
 557                 list_for_each_entry_safe(buf, prev, &dma_q->active, vb.queue) {
 558                         list_del(&buf->vb.queue);
 559                         buf->vb.state = VIDEOBUF_ERROR;
 560                         wake_up(&buf->vb.done);
 561                 }
 562                 mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
 563
 564                 return 0;
 565         }
 566
 567         prev = NULL;
 568         for (;;) {
 569                 if (list_empty(&dma_q->queued))
 570                         return 0;
 571                 buf = list_entry(dma_q->queued.next,
 572                                  struct vivi_buffer, vb.queue);
 573                 if (NULL == prev) {
 574                         list_del(&buf->vb.queue);
 575                         list_add_tail(&buf->vb.queue, &dma_q->active);
 576
 577                         dprintk(dev, 1, "Restarting video dma\n");
 578                         vivi_stop_thread(dma_q);
 579                         vivi_start_thread(dma_q);
 580
 581                         buf->vb.state = VIDEOBUF_ACTIVE;
 582                         mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
 583                         dprintk(dev, 2,
 584                                 "[%p/%d] restart_queue - first active\n",
 585                                 buf, buf->vb.i);
 586
 587                 } else if (prev->vb.width  == buf->vb.width  &&
 588                            prev->vb.height == buf->vb.height &&
 589                            prev->fmt       == buf->fmt) {
 590                         list_del(&buf->vb.queue);
 591                         list_add_tail(&buf->vb.queue, &dma_q->active);
 592                         buf->vb.state = VIDEOBUF_ACTIVE;
 593                         dprintk(dev, 2,
 594                                 "[%p/%d] restart_queue - move to active\n",
 595                                 buf, buf->vb.i);
 596                 } else {
 597                         return 0;
 598                 }
 599                 prev = buf;
 600         }
 601 }
 602
 603 static void vivi_vid_timeout(unsigned long data)
 604 {
 605         struct vivi_dev      *dev  = (struct vivi_dev *)data;
 606         struct vivi_dmaqueue *vidq = &dev->vidq;
 607         struct vivi_buffer   *buf;
 608
 609         spin_lock(&dev->slock);
 610
 611         while (!list_empty(&vidq->active)) {
 612                 buf = list_entry(vidq->active.next,
 613                                  struct vivi_buffer, vb.queue);
 614                 list_del(&buf->vb.queue);
 615                 buf->vb.state = VIDEOBUF_ERROR;
 616                 wake_up(&buf->vb.done);
 617                 printk(KERN_INFO "vivi/0: [%p/%d] timeout\n", buf, buf->vb.i);
 618         }
 619         restart_video_queue(vidq);
 620
 621         spin_unlock(&dev->slock);
 622 }
 623
 624 /* ------------------------------------------------------------------
 625         Videobuf operations
 626    ------------------------------------------------------------------*/
 627 static int
 628 buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
 629 {
 630         struct vivi_fh  *fh = vq->priv_data;
 631         struct vivi_dev *dev  = fh->dev;
 632
 633         *size = fh->width*fh->height*2;
 634
 635         if (0 == *count)
 636                 *count = 32;
 637
 638         while (*size * *count > vid_limit * 1024 * 1024)
 639                 (*count)--;
 640
 641         dprintk(dev, 1, "%s, count=%d, size=%d\n", __FUNCTION__,
 642                 *count, *size);
 643
 644         return 0;
 645 }
 646
 647 static void free_buffer(struct videobuf_queue *vq, struct vivi_buffer *buf)
 648 {
 649         struct vivi_fh  *fh = vq->priv_data;
 650         struct vivi_dev *dev  = fh->dev;
 651
 652         dprintk(dev, 1, "%s\n", __FUNCTION__);
 653
 654         if (in_interrupt())
 655                 BUG();
 656
 657         videobuf_waiton(&buf->vb, 0, 0);
 658         videobuf_vmalloc_free(&buf->vb);
 659         buf->vb.state = VIDEOBUF_NEEDS_INIT;
 660 }
 661
 662 #define norm_maxw() 1024
 663 #define norm_maxh() 768
 664 static int
 665 buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
 666                                                 enum v4l2_field field)
 667 {
 668         struct vivi_fh     *fh  = vq->priv_data;
 669         struct vivi_dev    *dev = fh->dev;
 670         struct vivi_buffer *buf = container_of(vb, struct vivi_buffer, vb);
 671         int rc, init_buffer = 0;
 672
 673         dprintk(dev, 1, "%s, field=%d\n", __FUNCTION__, field);
 674
 675         BUG_ON(NULL == fh->fmt);
 676         if (fh->width  < 48 || fh->width  > norm_maxw() ||
 677             fh->height < 32 || fh->height > norm_maxh())
 678                 return -EINVAL;
 679         buf->vb.size = fh->width*fh->height*2;
 680         if (0 != buf->vb.baddr  &&  buf->vb.bsize < buf->vb.size)
 681                 return -EINVAL;
 682
 683         if (buf->fmt       != fh->fmt    ||
 684             buf->vb.width  != fh->width  ||
 685             buf->vb.height != fh->height ||
 686         buf->vb.field  != field) {
 687                 buf->fmt       = fh->fmt;
 688                 buf->vb.width  = fh->width;
 689                 buf->vb.height = fh->height;
 690                 buf->vb.field  = field;
 691                 init_buffer = 1;
 692         }
 693
 694         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
 695                 rc = videobuf_iolock(vq, &buf->vb, NULL);
 696                 if (rc < 0)
 697                         goto fail;
 698         }
 699
 700         buf->vb.state = VIDEOBUF_PREPARED;
 701
 702         return 0;
 703
 704 fail:
 705         free_buffer(vq, buf);
 706         return rc;
 707 }
 708
 709 static void
 710 buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 711 {
 712         struct vivi_buffer    *buf  = container_of(vb, struct vivi_buffer, vb);
 713         struct vivi_fh        *fh   = vq->priv_data;
 714         struct vivi_dev       *dev  = fh->dev;
 715         struct vivi_dmaqueue  *vidq = &dev->vidq;
 716         struct vivi_buffer    *prev;
 717
 718         if (!list_empty(&vidq->queued)) {
 719                 dprintk(dev, 1, "adding vb queue=0x%08lx\n",
 720                         (unsigned long)&buf->vb.queue);
 721                 list_add_tail(&buf->vb.queue, &vidq->queued);
 722                 buf->vb.state = VIDEOBUF_QUEUED;
 723                 dprintk(dev, 2, "[%p/%d] buffer_queue - append to queued\n",
 724                         buf, buf->vb.i);
 725         } else if (list_empty(&vidq->active)) {
 726                 list_add_tail(&buf->vb.queue, &vidq->active);
 727
 728                 buf->vb.state = VIDEOBUF_ACTIVE;
 729                 mod_timer(&vidq->timeout, jiffies+BUFFER_TIMEOUT);
 730                 dprintk(dev, 2, "[%p/%d] buffer_queue - first active\n",
 731                         buf, buf->vb.i);
 732
 733                 vivi_start_thread(vidq);
 734         } else {
 735                 prev = list_entry(vidq->active.prev,
 736                                   struct vivi_buffer, vb.queue);
 737                 if (prev->vb.width  == buf->vb.width  &&
 738                     prev->vb.height == buf->vb.height &&
 739                     prev->fmt       == buf->fmt) {
 740                         list_add_tail(&buf->vb.queue, &vidq->active);
 741                         buf->vb.state = VIDEOBUF_ACTIVE;
 742                         dprintk(dev, 2,
 743                                 "[%p/%d] buffer_queue - append to active\n",
 744                                 buf, buf->vb.i);
 745
 746                 } else {
 747                         list_add_tail(&buf->vb.queue, &vidq->queued);
 748                         buf->vb.state = VIDEOBUF_QUEUED;
 749                         dprintk(dev, 2,
 750                                 "[%p/%d] buffer_queue - first queued\n",
 751                                 buf, buf->vb.i);
 752                 }
 753         }
 754 }
 755
 756 static void buffer_release(struct videobuf_queue *vq,
 757                            struct videobuf_buffer *vb)
 758 {
 759         struct vivi_buffer   *buf  = container_of(vb, struct vivi_buffer, vb);
 760         struct vivi_fh       *fh   = vq->priv_data;
 761         struct vivi_dev      *dev  = (struct vivi_dev *)fh->dev;
 762         struct vivi_dmaqueue *vidq = &dev->vidq;
 763
 764         dprintk(dev, 1, "%s\n", __FUNCTION__);
 765
 766         vivi_stop_thread(vidq);
 767
 768         free_buffer(vq, buf);
 769 }
 770
 771 static struct videobuf_queue_ops vivi_video_qops = {
 772         .buf_setup      = buffer_setup,
 773         .buf_prepare    = buffer_prepare,
 774         .buf_queue      = buffer_queue,
 775         .buf_release    = buffer_release,
 776 };
 777
 778 /* ------------------------------------------------------------------
 779         IOCTL vidioc handling
 780    ------------------------------------------------------------------*/
 781 static int vidioc_querycap(struct file *file, void  *priv,
 782                                         struct v4l2_capability *cap)
 783 {
 784         strcpy(cap->driver, "vivi");
 785         strcpy(cap->card, "vivi");
 786         cap->version = VIVI_VERSION;
 787         cap->capabilities =     V4L2_CAP_VIDEO_CAPTURE |
 788                                 V4L2_CAP_STREAMING     |
 789                                 V4L2_CAP_READWRITE;
 790         return 0;
 791 }
 792
 793 static int vidioc_enum_fmt_cap(struct file *file, void  *priv,
 794                                         struct v4l2_fmtdesc *f)
 795 {
 796         if (f->index > 0)
 797                 return -EINVAL;
 798
 799         strlcpy(f->description, format.name, sizeof(f->description));
 800         f->pixelformat = format.fourcc;
 801         return 0;
 802 }
 803
 804 static int vidioc_g_fmt_cap(struct file *file, void *priv,
 805                                         struct v4l2_format *f)
 806 {
 807         struct vivi_fh *fh = priv;
 808
 809         f->fmt.pix.width        = fh->width;
 810         f->fmt.pix.height       = fh->height;
 811         f->fmt.pix.field        = fh->vb_vidq.field;
 812         f->fmt.pix.pixelformat  = fh->fmt->fourcc;
 813         f->fmt.pix.bytesperline =
 814                 (f->fmt.pix.width * fh->fmt->depth) >> 3;
 815         f->fmt.pix.sizeimage =
 816                 f->fmt.pix.height * f->fmt.pix.bytesperline;
 817
 818         return (0);
 819 }
 820
 821 static int vidioc_try_fmt_cap(struct file *file, void *priv,
 822                         struct v4l2_format *f)
 823 {
 824         struct vivi_fh  *fh  = priv;
 825         struct vivi_dev *dev = fh->dev;
 826         struct vivi_fmt *fmt;
 827         enum v4l2_field field;
 828         unsigned int maxw, maxh;
 829
 830         if (format.fourcc != f->fmt.pix.pixelformat) {
 831                 dprintk(dev, 1, "Fourcc format (0x%08x) invalid. "
 832                         "Driver accepts only 0x%08x\n",
 833                         f->fmt.pix.pixelformat, format.fourcc);
 834                 return -EINVAL;
 835         }
 836         fmt = &format;
 837
 838         field = f->fmt.pix.field;
 839
 840         if (field == V4L2_FIELD_ANY) {
 841                 field = V4L2_FIELD_INTERLACED;
 842         } else if (V4L2_FIELD_INTERLACED != field) {
 843                 dprintk(dev, 1, "Field type invalid.\n");
 844                 return -EINVAL;
 845         }
 846
 847         maxw  = norm_maxw();
 848         maxh  = norm_maxh();
 849
 850         f->fmt.pix.field = field;
 851         if (f->fmt.pix.height < 32)
 852                 f->fmt.pix.height = 32;
 853         if (f->fmt.pix.height > maxh)
 854                 f->fmt.pix.height = maxh;
 855         if (f->fmt.pix.width < 48)
 856                 f->fmt.pix.width = 48;
 857         if (f->fmt.pix.width > maxw)
 858                 f->fmt.pix.width = maxw;
 859         f->fmt.pix.width &= ~0x03;
 860         f->fmt.pix.bytesperline =
 861                 (f->fmt.pix.width * fmt->depth) >> 3;
 862         f->fmt.pix.sizeimage =
 863                 f->fmt.pix.height * f->fmt.pix.bytesperline;
 864
 865         return 0;
 866 }
 867
 868 /*FIXME: This seems to be generic enough to be at videodev2 */
 869 static int vidioc_s_fmt_cap(struct file *file, void *priv,
 870                                         struct v4l2_format *f)
 871 {
 872         struct vivi_fh  *fh = priv;
 873         int ret = vidioc_try_fmt_cap(file, fh, f);
 874         if (ret < 0)
 875                 return (ret);
 876
 877         fh->fmt           = &format;
 878         fh->width         = f->fmt.pix.width;
 879         fh->height        = f->fmt.pix.height;
 880         fh->vb_vidq.field = f->fmt.pix.field;
 881         fh->type          = f->type;
 882
 883         return (0);
 884 }
 885
 886 static int vidioc_reqbufs(struct file *file, void *priv,
 887                           struct v4l2_requestbuffers *p)
 888 {
 889         struct vivi_fh  *fh = priv;
 890
 891         return (videobuf_reqbufs(&fh->vb_vidq, p));
 892 }
 893
 894 static int vidioc_querybuf(struct file *file, void *priv, struct v4l2_buffer *p)
 895 {
 896         struct vivi_fh  *fh = priv;
 897
 898         return (videobuf_querybuf(&fh->vb_vidq, p));
 899 }
 900
 901 static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)
 902 {
 903         struct vivi_fh *fh = priv;
 904
 905         return (videobuf_qbuf(&fh->vb_vidq, p));
 906 }
 907
 908 static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
 909 {
 910         struct vivi_fh  *fh = priv;
 911
 912         return (videobuf_dqbuf(&fh->vb_vidq, p,
 913                                 file->f_flags & O_NONBLOCK));
 914 }
 915
 916 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 917 static int vidiocgmbuf(struct file *file, void *priv, struct video_mbuf *mbuf)
 918 {
 919         struct vivi_fh  *fh = priv;
 920
 921         return videobuf_cgmbuf(&fh->vb_vidq, mbuf, 8);
 922 }
 923 #endif
 924
 925 static int vidioc_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
 926 {
 927         struct vivi_fh  *fh = priv;
 928
 929         if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 930                 return -EINVAL;
 931         if (i != fh->type)
 932                 return -EINVAL;
 933
 934         return videobuf_streamon(&fh->vb_vidq);
 935 }
 936
 937 static int vidioc_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
 938 {
 939         struct vivi_fh  *fh = priv;
 940
 941         if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 942                 return -EINVAL;
 943         if (i != fh->type)
 944                 return -EINVAL;
 945
 946         return videobuf_streamoff(&fh->vb_vidq);
 947 }
 948
 949 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *i)
 950 {
 951         return 0;
 952 }
 953
 954 /* only one input in this sample driver */
 955 static int vidioc_enum_input(struct file *file, void *priv,
 956                                 struct v4l2_input *inp)
 957 {
 958         if (inp->index != 0)
 959                 return -EINVAL;
 960
 961         inp->type = V4L2_INPUT_TYPE_CAMERA;
 962         inp->std = V4L2_STD_525_60;
 963         strcpy(inp->name, "Camera");
 964
 965         return (0);
 966 }
 967
 968 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
 969 {
 970         *i = 0;
 971
 972         return (0);
 973 }
 974 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
 975 {
 976         if (i > 0)
 977                 return -EINVAL;
 978
 979         return (0);
 980 }
 981
 982         /* --- controls ---------------------------------------------- */
 983 static int vidioc_queryctrl(struct file *file, void *priv,
 984                             struct v4l2_queryctrl *qc)
 985 {
 986         int i;
 987
 988         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
 989                 if (qc->id && qc->id == vivi_qctrl[i].id) {
 990                         memcpy(qc, &(vivi_qctrl[i]),
 991                                 sizeof(*qc));
 992                         return (0);
 993                 }
 994
 995         return -EINVAL;
 996 }
 997
 998 static int vidioc_g_ctrl(struct file *file, void *priv,
 999                          struct v4l2_control *ctrl)
1000 {
1001         int i;
1002
1003         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1004                 if (ctrl->id == vivi_qctrl[i].id) {
1005                         ctrl->value = qctl_regs[i];
1006                         return (0);
1007                 }
1008
1009         return -EINVAL;
1010 }
1011 static int vidioc_s_ctrl(struct file *file, void *priv,
1012                                 struct v4l2_control *ctrl)
1013 {
1014         int i;
1015
1016         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1017                 if (ctrl->id == vivi_qctrl[i].id) {
1018                         if (ctrl->value < vivi_qctrl[i].minimum
1019                             || ctrl->value > vivi_qctrl[i].maximum) {
1020                                         return (-ERANGE);
1021                                 }
1022                         qctl_regs[i] = ctrl->value;
1023                         return (0);
1024                 }
1025         return -EINVAL;
1026 }
1027
1028 /* ------------------------------------------------------------------
1029         File operations for the device
1030    ------------------------------------------------------------------*/
1031
1032 #define line_buf_size(norm) (norm_maxw(norm)*(format.depth+7)/8)
1033
1034 static int vivi_open(struct inode *inode, struct file *file)
1035 {
1036         int minor = iminor(inode);
1037         struct vivi_dev *dev;
1038         struct vivi_fh *fh;
1039         int i;
1040         int retval = 0;
1041
1042         printk(KERN_DEBUG "vivi: open called (minor=%d)\n", minor);
1043
1044         list_for_each_entry(dev, &vivi_devlist, vivi_devlist)
1045                 if (dev->vfd->minor == minor)
1046                         goto found;
1047         return -ENODEV;
1048
1049 found:
1050         mutex_lock(&dev->mutex);
1051         dev->users++;
1052
1053         if (dev->users > 1) {
1054                 dev->users--;
1055                 retval = -EBUSY;
1056                 goto unlock;
1057         }
1058
1059         dprintk(dev, 1, "open minor=%d type=%s users=%d\n", minor,
1060                 v4l2_type_names[V4L2_BUF_TYPE_VIDEO_CAPTURE], dev->users);
1061
1062         /* allocate + initialize per filehandle data */
1063         fh = kzalloc(sizeof(*fh), GFP_KERNEL);
1064         if (NULL == fh) {
1065                 dev->users--;
1066                 retval = -ENOMEM;
1067                 goto unlock;
1068         }
1069 unlock:
1070         mutex_unlock(&dev->mutex);
1071         if (retval)
1072                 return retval;
1073
1074         file->private_data = fh;
1075         fh->dev      = dev;
1076
1077         fh->type     = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1078         fh->fmt      = &format;
1079         fh->width    = 640;
1080         fh->height   = 480;
1081
1082         /* Put all controls at a sane state */
1083         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1084                 qctl_regs[i] = vivi_qctrl[i].default_value;
1085
1086         /* Resets frame counters */
1087         dev->h = 0;
1088         dev->m = 0;
1089         dev->s = 0;
1090         dev->ms = 0;
1091         dev->mv_count = 0;
1092         dev->jiffies = jiffies;
1093         sprintf(dev->timestr, "%02d:%02d:%02d:%03d",
1094                         dev->h, dev->m, dev->s, dev->ms);
1095
1096         videobuf_queue_vmalloc_init(&fh->vb_vidq, &vivi_video_qops,
1097                         NULL, &dev->slock, fh->type, V4L2_FIELD_INTERLACED,
1098                         sizeof(struct vivi_buffer), fh);
1099
1100         return 0;
1101 }
1102
1103 static ssize_t
1104 vivi_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
1105 {
1106         struct vivi_fh *fh = file->private_data;
1107
1108         if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
1109                 return videobuf_read_stream(&fh->vb_vidq, data, count, ppos, 0,
1110                                         file->f_flags & O_NONBLOCK);
1111         }
1112         return 0;
1113 }
1114
1115 static unsigned int
1116 vivi_poll(struct file *file, struct poll_table_struct *wait)
1117 {
1118         struct vivi_fh        *fh = file->private_data;
1119         struct vivi_dev       *dev = fh->dev;
1120         struct videobuf_queue *q = &fh->vb_vidq;
1121
1122         dprintk(dev, 1, "%s\n", __FUNCTION__);
1123
1124         if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
1125                 return POLLERR;
1126
1127         return videobuf_poll_stream(file, q, wait);
1128 }
1129
1130 static int vivi_close(struct inode *inode, struct file *file)
1131 {
1132         struct vivi_fh         *fh = file->private_data;
1133         struct vivi_dev *dev       = fh->dev;
1134         struct vivi_dmaqueue *vidq = &dev->vidq;
1135
1136         int minor = iminor(inode);
1137
1138         vivi_stop_thread(vidq);
1139         videobuf_stop(&fh->vb_vidq);
1140         videobuf_mmap_free(&fh->vb_vidq);
1141
1142         kfree(fh);
1143
1144         mutex_lock(&dev->mutex);
1145         dev->users--;
1146         mutex_unlock(&dev->mutex);
1147
1148         dprintk(dev, 1, "close called (minor=%d, users=%d)\n",
1149                 minor, dev->users);
1150
1151         return 0;
1152 }
1153
1154 static int vivi_release(void)
1155 {
1156         struct vivi_dev *dev;
1157         struct list_head *list;
1158
1159         while (!list_empty(&vivi_devlist)) {
1160                 list = vivi_devlist.next;
1161                 list_del(list);
1162                 dev = list_entry(list, struct vivi_dev, vivi_devlist);
1163
1164                 if (-1 != dev->vfd->minor)
1165                         video_unregister_device(dev->vfd);
1166                 else
1167                         video_device_release(dev->vfd);
1168
1169                 kfree(dev);
1170         }
1171
1172         return 0;
1173 }
1174
1175 static int vivi_mmap(struct file *file, struct vm_area_struct *vma)
1176 {
1177         struct vivi_fh  *fh = file->private_data;
1178         struct vivi_dev *dev = fh->dev;
1179         int ret;
1180
1181         dprintk(dev, 1, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
1182
1183         ret = videobuf_mmap_mapper(&fh->vb_vidq, vma);
1184
1185         dprintk(dev, 1, "vma start=0x%08lx, size=%ld, ret=%d\n",
1186                 (unsigned long)vma->vm_start,
1187                 (unsigned long)vma->vm_end-(unsigned long)vma->vm_start,
1188                 ret);
1189
1190         return ret;
1191 }
1192
1193 static const struct file_operations vivi_fops = {
1194         .owner          = THIS_MODULE,
1195         .open           = vivi_open,
1196         .release        = vivi_close,
1197         .read           = vivi_read,
1198         .poll           = vivi_poll,
1199         .ioctl          = video_ioctl2, /* V4L2 ioctl handler */
1200         .compat_ioctl   = v4l_compat_ioctl32,
1201         .mmap           = vivi_mmap,
1202         .llseek         = no_llseek,
1203 };
1204
1205 static struct video_device vivi_template = {
1206         .name           = "vivi",
1207         .type           = VID_TYPE_CAPTURE,
1208         .fops           = &vivi_fops,
1209         .minor          = -1,
1210         .release        = video_device_release,
1211
1212         .vidioc_querycap      = vidioc_querycap,
1213         .vidioc_enum_fmt_cap  = vidioc_enum_fmt_cap,
1214         .vidioc_g_fmt_cap     = vidioc_g_fmt_cap,
1215         .vidioc_try_fmt_cap   = vidioc_try_fmt_cap,
1216         .vidioc_s_fmt_cap     = vidioc_s_fmt_cap,
1217         .vidioc_reqbufs       = vidioc_reqbufs,
1218         .vidioc_querybuf      = vidioc_querybuf,
1219         .vidioc_qbuf          = vidioc_qbuf,
1220         .vidioc_dqbuf         = vidioc_dqbuf,
1221         .vidioc_s_std         = vidioc_s_std,
1222         .vidioc_enum_input    = vidioc_enum_input,
1223         .vidioc_g_input       = vidioc_g_input,
1224         .vidioc_s_input       = vidioc_s_input,
1225         .vidioc_queryctrl     = vidioc_queryctrl,
1226         .vidioc_g_ctrl        = vidioc_g_ctrl,
1227         .vidioc_s_ctrl        = vidioc_s_ctrl,
1228         .vidioc_streamon      = vidioc_streamon,
1229         .vidioc_streamoff     = vidioc_streamoff,
1230 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1231         .vidiocgmbuf          = vidiocgmbuf,
1232 #endif
1233         .tvnorms              = V4L2_STD_525_60,
1234         .current_norm         = V4L2_STD_NTSC_M,
1235 };
1236 /* -----------------------------------------------------------------
1237         Initialization and module stuff
1238    ------------------------------------------------------------------*/
1239
1240 static int __init vivi_init(void)
1241 {
1242         int ret = -ENOMEM, i;
1243         struct vivi_dev *dev;
1244         struct video_device *vfd;
1245
1246         for (i = 0; i < n_devs; i++) {
1247                 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1248                 if (NULL == dev)
1249                         break;
1250
1251                 list_add_tail(&dev->vivi_devlist, &vivi_devlist);
1252
1253                 /* init video dma queues */
1254                 INIT_LIST_HEAD(&dev->vidq.active);
1255                 INIT_LIST_HEAD(&dev->vidq.queued);
1256                 init_waitqueue_head(&dev->vidq.wq);
1257
1258                 /* initialize locks */
1259                 mutex_init(&dev->lock);
1260                 spin_lock_init(&dev->slock);
1261                 mutex_init(&dev->mutex);
1262
1263                 dev->vidq.timeout.function = vivi_vid_timeout;
1264                 dev->vidq.timeout.data     = (unsigned long)dev;
1265                 init_timer(&dev->vidq.timeout);
1266
1267                 vfd = video_device_alloc();
1268                 if (NULL == vfd)
1269                         break;
1270
1271                 *vfd = vivi_template;
1272
1273                 ret = video_register_device(vfd, VFL_TYPE_GRABBER, video_nr);
1274                 if (ret < 0)
1275                         break;
1276
1277                 snprintf(vfd->name, sizeof(vfd->name), "%s (%i)",
1278                          vivi_template.name, vfd->minor);
1279
1280                 if (video_nr >= 0)
1281                         video_nr++;
1282
1283                 dev->vfd = vfd;
1284         }
1285
1286         if (ret < 0) {
1287                 vivi_release();
1288                 printk(KERN_INFO "Error %d while loading vivi driver\n", ret);
1289         } else
1290                 printk(KERN_INFO "Video Technology Magazine Virtual Video "
1291                                  "Capture Board successfully loaded.\n");
1292         return ret;
1293 }
1294
1295 static void __exit vivi_exit(void)
1296 {
1297         vivi_release();
1298 }
1299
1300 module_init(vivi_init);
1301 module_exit(vivi_exit);
1302
1303 MODULE_DESCRIPTION("Video Technology Magazine Virtual Video Capture Board");
1304 MODULE_AUTHOR("Mauro Carvalho Chehab, Ted Walther and John Sokol");
1305 MODULE_LICENSE("Dual BSD/GPL");
1306
1307 module_param(video_nr, int, 0);
1308 MODULE_PARM_DESC(video_nr, "video iminor start number");
1309
1310 module_param(n_devs, int, 0);
1311 MODULE_PARM_DESC(n_devs, "number of video devices to create");
1312
1313 module_param_named(debug, vivi_template.debug, int, 0444);
1314 MODULE_PARM_DESC(debug, "activates debug info");
1315
1316 module_param(vid_limit, int, 0644);
1317 MODULE_PARM_DESC(vid_limit, "capture memory limit in megabytes");