git.oblomov.eu 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/video-buf.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 /* These timers are for 1 fps - used only for testing */
  48 //#define WAKE_DENOMINATOR 30 /* hack for testing purposes */
  49 //#define BUFFER_TIMEOUT     msecs_to_jiffies(5000)  /* 5 seconds */
  50
  51 #include "font.h"
  52
  53 #define VIVI_MAJOR_VERSION 0
  54 #define VIVI_MINOR_VERSION 4
  55 #define VIVI_RELEASE 0
  56 #define VIVI_VERSION KERNEL_VERSION(VIVI_MAJOR_VERSION, VIVI_MINOR_VERSION, VIVI_RELEASE)
  57
  58 /* Declare static vars that will be used as parameters */
  59 static unsigned int vid_limit = 16;     /* Video memory limit, in Mb */
  60 static struct video_device vivi;        /* Video device */
  61 static int video_nr = -1;               /* /dev/videoN, -1 for autodetect */
  62
  63 /* supported controls */
  64 static struct v4l2_queryctrl vivi_qctrl[] = {
  65         {
  66                 .id            = V4L2_CID_AUDIO_VOLUME,
  67                 .name          = "Volume",
  68                 .minimum       = 0,
  69                 .maximum       = 65535,
  70                 .step          = 65535/100,
  71                 .default_value = 65535,
  72                 .flags         = 0,
  73                 .type          = V4L2_CTRL_TYPE_INTEGER,
  74         },{
  75                 .id            = V4L2_CID_BRIGHTNESS,
  76                 .type          = V4L2_CTRL_TYPE_INTEGER,
  77                 .name          = "Brightness",
  78                 .minimum       = 0,
  79                 .maximum       = 255,
  80                 .step          = 1,
  81                 .default_value = 127,
  82                 .flags         = 0,
  83         }, {
  84                 .id            = V4L2_CID_CONTRAST,
  85                 .type          = V4L2_CTRL_TYPE_INTEGER,
  86                 .name          = "Contrast",
  87                 .minimum       = 0,
  88                 .maximum       = 255,
  89                 .step          = 0x1,
  90                 .default_value = 0x10,
  91                 .flags         = 0,
  92         }, {
  93                 .id            = V4L2_CID_SATURATION,
  94                 .type          = V4L2_CTRL_TYPE_INTEGER,
  95                 .name          = "Saturation",
  96                 .minimum       = 0,
  97                 .maximum       = 255,
  98                 .step          = 0x1,
  99                 .default_value = 127,
 100                 .flags         = 0,
 101         }, {
 102                 .id            = V4L2_CID_HUE,
 103                 .type          = V4L2_CTRL_TYPE_INTEGER,
 104                 .name          = "Hue",
 105                 .minimum       = -128,
 106                 .maximum       = 127,
 107                 .step          = 0x1,
 108                 .default_value = 0,
 109                 .flags         = 0,
 110         }
 111 };
 112
 113 static int qctl_regs[ARRAY_SIZE(vivi_qctrl)];
 114
 115 #define dprintk(level,fmt, arg...)                                      \
 116         do {                                                            \
 117                 if (vivi.debug >= (level))                              \
 118                         printk(KERN_DEBUG "vivi: " fmt , ## arg);       \
 119         } while (0)
 120
 121 /* ------------------------------------------------------------------
 122         Basic structures
 123    ------------------------------------------------------------------*/
 124
 125 struct vivi_fmt {
 126         char  *name;
 127         u32   fourcc;          /* v4l2 format id */
 128         int   depth;
 129 };
 130
 131 static struct vivi_fmt format = {
 132         .name     = "4:2:2, packed, YUYV",
 133         .fourcc   = V4L2_PIX_FMT_YUYV,
 134         .depth    = 16,
 135 };
 136
 137 struct sg_to_addr {
 138         int pos;
 139         struct scatterlist *sg;
 140 };
 141
 142 /* buffer for one video frame */
 143 struct vivi_buffer {
 144         /* common v4l buffer stuff -- must be first */
 145         struct videobuf_buffer vb;
 146
 147         struct vivi_fmt        *fmt;
 148
 149 };
 150
 151 struct vivi_dmaqueue {
 152         struct list_head       active;
 153         struct list_head       queued;
 154         struct timer_list      timeout;
 155
 156         /* thread for generating video stream*/
 157         struct task_struct         *kthread;
 158         wait_queue_head_t          wq;
 159         /* Counters to control fps rate */
 160         int                        frame;
 161         int                        ini_jiffies;
 162 };
 163
 164 static LIST_HEAD(vivi_devlist);
 165
 166 struct vivi_dev {
 167         struct list_head           vivi_devlist;
 168
 169         struct mutex               lock;
 170
 171         int                        users;
 172
 173         /* various device info */
 174         unsigned int               resources;
 175         struct video_device        vfd;
 176
 177         struct vivi_dmaqueue       vidq;
 178
 179         /* Several counters */
 180         int                        h,m,s,us,jiffies;
 181         char                       timestr[13];
 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 };
 210
 211 static u8 bars[8][3] = {
 212         /* R   G   B */
 213         {204,204,204},  /* white */
 214         {208,208,  0},  /* ambar */
 215         {  0,206,206},  /* cyan */
 216         {  0,239,  0},  /* green */
 217         {239,  0,239},  /* magenta */
 218         {205,  0,  0},  /* red */
 219         {  0,  0,255},  /* blue */
 220         {  0,  0,  0}
 221 };
 222
 223 #define TO_Y(r,g,b) (((16829*r +33039*g +6416*b  + 32768)>>16)+16)
 224 /* RGB to  V(Cr) Color transform */
 225 #define TO_V(r,g,b) (((28784*r -24103*g -4681*b  + 32768)>>16)+128)
 226 /* RGB to  U(Cb) Color transform */
 227 #define TO_U(r,g,b) (((-9714*r -19070*g +28784*b + 32768)>>16)+128)
 228
 229 #define TSTAMP_MIN_Y 24
 230 #define TSTAMP_MAX_Y TSTAMP_MIN_Y+15
 231 #define TSTAMP_MIN_X 64
 232
 233
 234 static void gen_line(char *basep,int inipos,int wmax,
 235                      int hmax, int line, char *timestr)
 236 {
 237         int  w,i,j,pos=inipos,y;
 238         char *p,*s;
 239         u8   chr,r,g,b,color;
 240
 241         /* We will just duplicate the second pixel at the packet */
 242         wmax/=2;
 243
 244         /* Generate a standard color bar pattern */
 245         for (w=0;w<wmax;w++) {
 246                 r=bars[w*7/wmax][0];
 247                 g=bars[w*7/wmax][1];
 248                 b=bars[w*7/wmax][2];
 249
 250                 for (color=0;color<4;color++) {
 251                         p=basep+pos;
 252
 253                         switch (color) {
 254                                 case 0:
 255                                 case 2:
 256                                         *p=TO_Y(r,g,b);         /* Luminance */
 257                                         break;
 258                                 case 1:
 259                                         *p=TO_U(r,g,b);         /* Cb */
 260                                         break;
 261                                 case 3:
 262                                         *p=TO_V(r,g,b);         /* Cr */
 263                                         break;
 264                         }
 265                         pos++;
 266                 }
 267         }
 268
 269         /* Checks if it is possible to show timestamp */
 270         if (TSTAMP_MAX_Y>=hmax)
 271                 goto end;
 272         if (TSTAMP_MIN_X+strlen(timestr)>=wmax)
 273                 goto end;
 274
 275         /* Print stream time */
 276         if (line>=TSTAMP_MIN_Y && line<=TSTAMP_MAX_Y) {
 277                 j=TSTAMP_MIN_X;
 278                 for (s=timestr;*s;s++) {
 279                         chr=rom8x16_bits[(*s-0x30)*16+line-TSTAMP_MIN_Y];
 280                         for (i=0;i<7;i++) {
 281                                 if (chr&1<<(7-i)) { /* Font color*/
 282                                         r=bars[BLUE][0];
 283                                         g=bars[BLUE][1];
 284                                         b=bars[BLUE][2];
 285                                         r=g=b=0;
 286                                         g=198;
 287                                 } else { /* Background color */
 288                                         r=bars[WHITE][0];
 289                                         g=bars[WHITE][1];
 290                                         b=bars[WHITE][2];
 291                                         r=g=b=0;
 292                                 }
 293
 294                                 pos=inipos+j*2;
 295                                 for (color=0;color<4;color++) {
 296                                         p=basep+pos;
 297
 298                                         y=TO_Y(r,g,b);
 299
 300                                         switch (color) {
 301                                                 case 0:
 302                                                 case 2:
 303                                                         *p=TO_Y(r,g,b);         /* Luminance */
 304                                                         break;
 305                                                 case 1:
 306                                                         *p=TO_U(r,g,b);         /* Cb */
 307                                                         break;
 308                                                 case 3:
 309                                                         *p=TO_V(r,g,b);         /* Cr */
 310                                                         break;
 311                                         }
 312                                         pos++;
 313                                 }
 314                                 j++;
 315                         }
 316                 }
 317         }
 318
 319
 320 end:
 321         return;
 322 }
 323 static void vivi_fillbuff(struct vivi_dev *dev,struct vivi_buffer *buf)
 324 {
 325         int h,pos=0;
 326         int hmax  = buf->vb.height;
 327         int wmax  = buf->vb.width;
 328         struct timeval ts;
 329         char *tmpbuf;
 330
 331         if (buf->vb.dma.varea) {
 332                 tmpbuf=kmalloc (wmax*2, GFP_KERNEL);
 333         } else {
 334                 tmpbuf=buf->vb.dma.vmalloc;
 335         }
 336
 337
 338         for (h=0;h<hmax;h++) {
 339                 if (buf->vb.dma.varea) {
 340                         gen_line(tmpbuf,0,wmax,hmax,h,dev->timestr);
 341                         /* FIXME: replacing to __copy_to_user */
 342                         if (copy_to_user(buf->vb.dma.varea+pos,tmpbuf,wmax*2)!=0)
 343                                 dprintk(2,"vivifill copy_to_user failed.\n");
 344                 } else {
 345                         gen_line(tmpbuf,pos,wmax,hmax,h,dev->timestr);
 346                 }
 347                 pos += wmax*2;
 348         }
 349
 350         /* Updates stream time */
 351
 352         dev->us+=jiffies_to_usecs(jiffies-dev->jiffies);
 353         dev->jiffies=jiffies;
 354         if (dev->us>=1000000) {
 355                 dev->us-=1000000;
 356                 dev->s++;
 357                 if (dev->s>=60) {
 358                         dev->s-=60;
 359                         dev->m++;
 360                         if (dev->m>60) {
 361                                 dev->m-=60;
 362                                 dev->h++;
 363                                 if (dev->h>24)
 364                                         dev->h-=24;
 365                         }
 366                 }
 367         }
 368         sprintf(dev->timestr,"%02d:%02d:%02d:%03d",
 369                         dev->h,dev->m,dev->s,(dev->us+500)/1000);
 370
 371         dprintk(2,"vivifill at %s: Buffer 0x%08lx size= %d\n",dev->timestr,
 372                         (unsigned long)buf->vb.dma.varea,pos);
 373
 374         /* Advice that buffer was filled */
 375         buf->vb.state = STATE_DONE;
 376         buf->vb.field_count++;
 377         do_gettimeofday(&ts);
 378         buf->vb.ts = ts;
 379
 380         list_del(&buf->vb.queue);
 381         wake_up(&buf->vb.done);
 382 }
 383
 384 static int restart_video_queue(struct vivi_dmaqueue *dma_q);
 385
 386 static void vivi_thread_tick(struct vivi_dmaqueue  *dma_q)
 387 {
 388         struct vivi_buffer    *buf;
 389         struct vivi_dev *dev= container_of(dma_q,struct vivi_dev,vidq);
 390
 391         int bc;
 392
 393         /* Announces videobuf that all went ok */
 394         for (bc = 0;; bc++) {
 395                 if (list_empty(&dma_q->active)) {
 396                         dprintk(1,"No active queue to serve\n");
 397                         break;
 398                 }
 399
 400                 buf = list_entry(dma_q->active.next,
 401                                  struct vivi_buffer, vb.queue);
 402
 403                 /* Nobody is waiting something to be done, just return */
 404                 if (!waitqueue_active(&buf->vb.done)) {
 405                         mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
 406                         return;
 407                 }
 408
 409                 do_gettimeofday(&buf->vb.ts);
 410                 dprintk(2,"[%p/%d] wakeup\n",buf,buf->vb.i);
 411
 412                 /* Fill buffer */
 413                 vivi_fillbuff(dev,buf);
 414
 415                 if (list_empty(&dma_q->active)) {
 416                         del_timer(&dma_q->timeout);
 417                 } else {
 418                         mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
 419                 }
 420         }
 421         if (bc != 1)
 422                 dprintk(1,"%s: %d buffers handled (should be 1)\n",__FUNCTION__,bc);
 423 }
 424
 425 static void vivi_sleep(struct vivi_dmaqueue  *dma_q)
 426 {
 427         int timeout;
 428         DECLARE_WAITQUEUE(wait, current);
 429
 430         dprintk(1,"%s dma_q=0x%08lx\n",__FUNCTION__,(unsigned long)dma_q);
 431
 432         add_wait_queue(&dma_q->wq, &wait);
 433         if (!kthread_should_stop()) {
 434                 dma_q->frame++;
 435
 436                 /* Calculate time to wake up */
 437                 timeout=dma_q->ini_jiffies+msecs_to_jiffies((dma_q->frame*WAKE_NUMERATOR*1000)/WAKE_DENOMINATOR)-jiffies;
 438
 439                 if (timeout <= 0) {
 440                         int old=dma_q->frame;
 441                         dma_q->frame=(jiffies_to_msecs(jiffies-dma_q->ini_jiffies)*WAKE_DENOMINATOR)/(WAKE_NUMERATOR*1000)+1;
 442
 443                         timeout=dma_q->ini_jiffies+msecs_to_jiffies((dma_q->frame*WAKE_NUMERATOR*1000)/WAKE_DENOMINATOR)-jiffies;
 444
 445                         dprintk(1,"underrun, losed %d frames. "
 446                                   "Now, frame is %d. Waking on %d jiffies\n",
 447                                         dma_q->frame-old,dma_q->frame,timeout);
 448                 } else
 449                         dprintk(1,"will sleep for %i jiffies\n",timeout);
 450
 451                 vivi_thread_tick(dma_q);
 452
 453                 schedule_timeout_interruptible (timeout);
 454         }
 455
 456         remove_wait_queue(&dma_q->wq, &wait);
 457         try_to_freeze();
 458 }
 459
 460 static int vivi_thread(void *data)
 461 {
 462         struct vivi_dmaqueue  *dma_q=data;
 463
 464         dprintk(1,"thread started\n");
 465
 466         mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
 467         set_freezable();
 468
 469         for (;;) {
 470                 vivi_sleep(dma_q);
 471
 472                 if (kthread_should_stop())
 473                         break;
 474         }
 475         dprintk(1, "thread: exit\n");
 476         return 0;
 477 }
 478
 479 static int vivi_start_thread(struct vivi_dmaqueue  *dma_q)
 480 {
 481         dma_q->frame=0;
 482         dma_q->ini_jiffies=jiffies;
 483
 484         dprintk(1,"%s\n",__FUNCTION__);
 485
 486         dma_q->kthread = kthread_run(vivi_thread, dma_q, "vivi");
 487
 488         if (IS_ERR(dma_q->kthread)) {
 489                 printk(KERN_ERR "vivi: kernel_thread() failed\n");
 490                 return PTR_ERR(dma_q->kthread);
 491         }
 492         /* Wakes thread */
 493         wake_up_interruptible(&dma_q->wq);
 494
 495         dprintk(1,"returning from %s\n",__FUNCTION__);
 496         return 0;
 497 }
 498
 499 static void vivi_stop_thread(struct vivi_dmaqueue  *dma_q)
 500 {
 501         dprintk(1,"%s\n",__FUNCTION__);
 502         /* shutdown control thread */
 503         if (dma_q->kthread) {
 504                 kthread_stop(dma_q->kthread);
 505                 dma_q->kthread=NULL;
 506         }
 507 }
 508
 509 static int restart_video_queue(struct vivi_dmaqueue *dma_q)
 510 {
 511         struct vivi_buffer *buf, *prev;
 512         struct list_head *item;
 513
 514         dprintk(1,"%s dma_q=0x%08lx\n",__FUNCTION__,(unsigned long)dma_q);
 515
 516         if (!list_empty(&dma_q->active)) {
 517                 buf = list_entry(dma_q->active.next, struct vivi_buffer, vb.queue);
 518                 dprintk(2,"restart_queue [%p/%d]: restart dma\n",
 519                         buf, buf->vb.i);
 520
 521                 dprintk(1,"Restarting video dma\n");
 522                 vivi_stop_thread(dma_q);
 523 //              vivi_start_thread(dma_q);
 524
 525                 /* cancel all outstanding capture / vbi requests */
 526                 list_for_each(item,&dma_q->active) {
 527                         buf = list_entry(item, struct vivi_buffer, vb.queue);
 528
 529                         list_del(&buf->vb.queue);
 530                         buf->vb.state = STATE_ERROR;
 531                         wake_up(&buf->vb.done);
 532                 }
 533                 mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
 534
 535                 return 0;
 536         }
 537
 538         prev = NULL;
 539         for (;;) {
 540                 if (list_empty(&dma_q->queued))
 541                         return 0;
 542                 buf = list_entry(dma_q->queued.next, struct vivi_buffer, vb.queue);
 543                 if (NULL == prev) {
 544                         list_del(&buf->vb.queue);
 545                         list_add_tail(&buf->vb.queue,&dma_q->active);
 546
 547                         dprintk(1,"Restarting video dma\n");
 548                         vivi_stop_thread(dma_q);
 549                         vivi_start_thread(dma_q);
 550
 551                         buf->vb.state = STATE_ACTIVE;
 552                         mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
 553                         dprintk(2,"[%p/%d] restart_queue - first active\n",
 554                                 buf,buf->vb.i);
 555
 556                 } else if (prev->vb.width  == buf->vb.width  &&
 557                            prev->vb.height == buf->vb.height &&
 558                            prev->fmt       == buf->fmt) {
 559                         list_del(&buf->vb.queue);
 560                         list_add_tail(&buf->vb.queue,&dma_q->active);
 561                         buf->vb.state = STATE_ACTIVE;
 562                         dprintk(2,"[%p/%d] restart_queue - move to active\n",
 563                                 buf,buf->vb.i);
 564                 } else {
 565                         return 0;
 566                 }
 567                 prev = buf;
 568         }
 569 }
 570
 571 static void vivi_vid_timeout(unsigned long data)
 572 {
 573         struct vivi_dev      *dev  = (struct vivi_dev*)data;
 574         struct vivi_dmaqueue *vidq = &dev->vidq;
 575         struct vivi_buffer   *buf;
 576
 577         while (!list_empty(&vidq->active)) {
 578                 buf = list_entry(vidq->active.next, struct vivi_buffer, vb.queue);
 579                 list_del(&buf->vb.queue);
 580                 buf->vb.state = STATE_ERROR;
 581                 wake_up(&buf->vb.done);
 582                 printk("vivi/0: [%p/%d] timeout\n", buf, buf->vb.i);
 583         }
 584
 585         restart_video_queue(vidq);
 586 }
 587
 588 /* ------------------------------------------------------------------
 589         Videobuf operations
 590    ------------------------------------------------------------------*/
 591 static int
 592 buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
 593 {
 594         struct vivi_fh *fh = vq->priv_data;
 595
 596         *size = fh->width*fh->height*2;
 597
 598         if (0 == *count)
 599                 *count = 32;
 600         while (*size * *count > vid_limit * 1024 * 1024)
 601                 (*count)--;
 602         return 0;
 603 }
 604
 605 static void free_buffer(struct videobuf_queue *vq, struct vivi_buffer *buf)
 606 {
 607         dprintk(1,"%s\n",__FUNCTION__);
 608
 609         if (in_interrupt())
 610                 BUG();
 611
 612
 613         videobuf_waiton(&buf->vb,0,0);
 614         videobuf_dma_unmap(vq, &buf->vb.dma);
 615         videobuf_dma_free(&buf->vb.dma);
 616         buf->vb.state = STATE_NEEDS_INIT;
 617 }
 618
 619 #define norm_maxw() 1024
 620 #define norm_maxh() 768
 621 static int
 622 buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
 623                                                 enum v4l2_field field)
 624 {
 625         struct vivi_fh     *fh  = vq->priv_data;
 626         struct vivi_buffer *buf = container_of(vb,struct vivi_buffer,vb);
 627         int rc, init_buffer = 0;
 628
 629 //      dprintk(1,"%s, field=%d\n",__FUNCTION__,field);
 630
 631         BUG_ON(NULL == fh->fmt);
 632         if (fh->width  < 48 || fh->width  > norm_maxw() ||
 633             fh->height < 32 || fh->height > norm_maxh())
 634                 return -EINVAL;
 635         buf->vb.size = fh->width*fh->height*2;
 636         if (0 != buf->vb.baddr  &&  buf->vb.bsize < buf->vb.size)
 637                 return -EINVAL;
 638
 639         if (buf->fmt       != fh->fmt    ||
 640             buf->vb.width  != fh->width  ||
 641             buf->vb.height != fh->height ||
 642         buf->vb.field  != field) {
 643                 buf->fmt       = fh->fmt;
 644                 buf->vb.width  = fh->width;
 645                 buf->vb.height = fh->height;
 646                 buf->vb.field  = field;
 647                 init_buffer = 1;
 648         }
 649
 650         if (STATE_NEEDS_INIT == buf->vb.state) {
 651                 if (0 != (rc = videobuf_iolock(vq,&buf->vb,NULL)))
 652                         goto fail;
 653         }
 654
 655         buf->vb.state = STATE_PREPARED;
 656
 657         return 0;
 658
 659 fail:
 660         free_buffer(vq,buf);
 661         return rc;
 662 }
 663
 664 static void
 665 buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 666 {
 667         struct vivi_buffer    *buf     = container_of(vb,struct vivi_buffer,vb);
 668         struct vivi_fh        *fh      = vq->priv_data;
 669         struct vivi_dev       *dev     = fh->dev;
 670         struct vivi_dmaqueue  *vidq    = &dev->vidq;
 671         struct vivi_buffer    *prev;
 672
 673         if (!list_empty(&vidq->queued)) {
 674                 dprintk(1,"adding vb queue=0x%08lx\n",(unsigned long)&buf->vb.queue);
 675                 list_add_tail(&buf->vb.queue,&vidq->queued);
 676                 buf->vb.state = STATE_QUEUED;
 677                 dprintk(2,"[%p/%d] buffer_queue - append to queued\n",
 678                         buf, buf->vb.i);
 679         } else if (list_empty(&vidq->active)) {
 680                 list_add_tail(&buf->vb.queue,&vidq->active);
 681
 682                 buf->vb.state = STATE_ACTIVE;
 683                 mod_timer(&vidq->timeout, jiffies+BUFFER_TIMEOUT);
 684                 dprintk(2,"[%p/%d] buffer_queue - first active\n",
 685                         buf, buf->vb.i);
 686
 687                 vivi_start_thread(vidq);
 688         } else {
 689                 prev = list_entry(vidq->active.prev, struct vivi_buffer, vb.queue);
 690                 if (prev->vb.width  == buf->vb.width  &&
 691                     prev->vb.height == buf->vb.height &&
 692                     prev->fmt       == buf->fmt) {
 693                         list_add_tail(&buf->vb.queue,&vidq->active);
 694                         buf->vb.state = STATE_ACTIVE;
 695                         dprintk(2,"[%p/%d] buffer_queue - append to active\n",
 696                                 buf, buf->vb.i);
 697
 698                 } else {
 699                         list_add_tail(&buf->vb.queue,&vidq->queued);
 700                         buf->vb.state = STATE_QUEUED;
 701                         dprintk(2,"[%p/%d] buffer_queue - first queued\n",
 702                                 buf, buf->vb.i);
 703                 }
 704         }
 705 }
 706
 707 static void buffer_release(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 708 {
 709         struct vivi_buffer   *buf  = container_of(vb,struct vivi_buffer,vb);
 710         struct vivi_fh       *fh   = vq->priv_data;
 711         struct vivi_dev      *dev  = (struct vivi_dev*)fh->dev;
 712         struct vivi_dmaqueue *vidq = &dev->vidq;
 713
 714         dprintk(1,"%s\n",__FUNCTION__);
 715
 716         vivi_stop_thread(vidq);
 717
 718         free_buffer(vq,buf);
 719 }
 720
 721
 722 static struct videobuf_queue_ops vivi_video_qops = {
 723         .buf_setup      = buffer_setup,
 724         .buf_prepare    = buffer_prepare,
 725         .buf_queue      = buffer_queue,
 726         .buf_release    = buffer_release,
 727
 728         /* Non-pci handling routines */
 729 //      .vb_map_sg      = vivi_map_sg,
 730 //      .vb_dma_sync_sg = vivi_dma_sync_sg,
 731 //      .vb_unmap_sg    = vivi_unmap_sg,
 732 };
 733
 734 /* ------------------------------------------------------------------
 735         IOCTL handling
 736    ------------------------------------------------------------------*/
 737
 738
 739 static int res_get(struct vivi_dev *dev, struct vivi_fh *fh)
 740 {
 741         /* is it free? */
 742         mutex_lock(&dev->lock);
 743         if (dev->resources) {
 744                 /* no, someone else uses it */
 745                 mutex_unlock(&dev->lock);
 746                 return 0;
 747         }
 748         /* it's free, grab it */
 749         dev->resources =1;
 750         dprintk(1,"res: get\n");
 751         mutex_unlock(&dev->lock);
 752         return 1;
 753 }
 754
 755 static int res_locked(struct vivi_dev *dev)
 756 {
 757         return (dev->resources);
 758 }
 759
 760 static void res_free(struct vivi_dev *dev, struct vivi_fh *fh)
 761 {
 762         mutex_lock(&dev->lock);
 763         dev->resources = 0;
 764         dprintk(1,"res: put\n");
 765         mutex_lock(&dev->lock);
 766 }
 767
 768 /* ------------------------------------------------------------------
 769         IOCTL vidioc handling
 770    ------------------------------------------------------------------*/
 771 static int vidioc_querycap (struct file *file, void  *priv,
 772                                         struct v4l2_capability *cap)
 773 {
 774         strcpy(cap->driver, "vivi");
 775         strcpy(cap->card, "vivi");
 776         cap->version = VIVI_VERSION;
 777         cap->capabilities =     V4L2_CAP_VIDEO_CAPTURE |
 778                                 V4L2_CAP_STREAMING     |
 779                                 V4L2_CAP_READWRITE;
 780         return 0;
 781 }
 782
 783 static int vidioc_enum_fmt_cap (struct file *file, void  *priv,
 784                                         struct v4l2_fmtdesc *f)
 785 {
 786         if (f->index > 0)
 787                 return -EINVAL;
 788
 789         strlcpy(f->description,format.name,sizeof(f->description));
 790         f->pixelformat = format.fourcc;
 791         return 0;
 792 }
 793
 794 static int vidioc_g_fmt_cap (struct file *file, void *priv,
 795                                         struct v4l2_format *f)
 796 {
 797         struct vivi_fh  *fh=priv;
 798
 799         f->fmt.pix.width        = fh->width;
 800         f->fmt.pix.height       = fh->height;
 801         f->fmt.pix.field        = fh->vb_vidq.field;
 802         f->fmt.pix.pixelformat  = fh->fmt->fourcc;
 803         f->fmt.pix.bytesperline =
 804                 (f->fmt.pix.width * fh->fmt->depth) >> 3;
 805         f->fmt.pix.sizeimage =
 806                 f->fmt.pix.height * f->fmt.pix.bytesperline;
 807
 808         return (0);
 809 }
 810
 811 static int vidioc_try_fmt_cap (struct file *file, void *priv,
 812                         struct v4l2_format *f)
 813 {
 814         struct vivi_fmt *fmt;
 815         enum v4l2_field field;
 816         unsigned int maxw, maxh;
 817
 818         if (format.fourcc != f->fmt.pix.pixelformat) {
 819                 dprintk(1,"Fourcc format (0x%08x) invalid. Driver accepts "
 820                         "only 0x%08x\n",f->fmt.pix.pixelformat,format.fourcc);
 821                 return -EINVAL;
 822         }
 823         fmt=&format;
 824
 825         field = f->fmt.pix.field;
 826
 827         if (field == V4L2_FIELD_ANY) {
 828 //              field=V4L2_FIELD_INTERLACED;
 829                 field=V4L2_FIELD_SEQ_TB;
 830         } else if (V4L2_FIELD_INTERLACED != field) {
 831                 dprintk(1,"Field type invalid.\n");
 832                 return -EINVAL;
 833         }
 834
 835         maxw  = norm_maxw();
 836         maxh  = norm_maxh();
 837
 838         f->fmt.pix.field = field;
 839         if (f->fmt.pix.height < 32)
 840                 f->fmt.pix.height = 32;
 841         if (f->fmt.pix.height > maxh)
 842                 f->fmt.pix.height = maxh;
 843         if (f->fmt.pix.width < 48)
 844                 f->fmt.pix.width = 48;
 845         if (f->fmt.pix.width > maxw)
 846                 f->fmt.pix.width = maxw;
 847         f->fmt.pix.width &= ~0x03;
 848         f->fmt.pix.bytesperline =
 849                 (f->fmt.pix.width * fmt->depth) >> 3;
 850         f->fmt.pix.sizeimage =
 851                 f->fmt.pix.height * f->fmt.pix.bytesperline;
 852
 853         return 0;
 854 }
 855
 856 /*FIXME: This seems to be generic enough to be at videodev2 */
 857 static int vidioc_s_fmt_cap (struct file *file, void *priv,
 858                                         struct v4l2_format *f)
 859 {
 860         struct vivi_fh  *fh=priv;
 861         int ret = vidioc_try_fmt_cap(file,fh,f);
 862         if (ret < 0)
 863                 return (ret);
 864
 865         fh->fmt           = &format;
 866         fh->width         = f->fmt.pix.width;
 867         fh->height        = f->fmt.pix.height;
 868         fh->vb_vidq.field = f->fmt.pix.field;
 869         fh->type          = f->type;
 870
 871         return (0);
 872 }
 873
 874 static int vidioc_reqbufs (struct file *file, void *priv, struct v4l2_requestbuffers *p)
 875 {
 876         struct vivi_fh  *fh=priv;
 877
 878         return (videobuf_reqbufs(&fh->vb_vidq, p));
 879 }
 880
 881 static int vidioc_querybuf (struct file *file, void *priv, struct v4l2_buffer *p)
 882 {
 883         struct vivi_fh  *fh=priv;
 884
 885         return (videobuf_querybuf(&fh->vb_vidq, p));
 886 }
 887
 888 static int vidioc_qbuf (struct file *file, void *priv, struct v4l2_buffer *p)
 889 {
 890         struct vivi_fh  *fh=priv;
 891
 892         return (videobuf_qbuf(&fh->vb_vidq, p));
 893 }
 894
 895 static int vidioc_dqbuf (struct file *file, void *priv, struct v4l2_buffer *p)
 896 {
 897         struct vivi_fh  *fh=priv;
 898
 899         return (videobuf_dqbuf(&fh->vb_vidq, p,
 900                                 file->f_flags & O_NONBLOCK));
 901 }
 902
 903 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 904 static int vidiocgmbuf (struct file *file, void *priv, struct video_mbuf *mbuf)
 905 {
 906         struct vivi_fh  *fh=priv;
 907         struct videobuf_queue *q=&fh->vb_vidq;
 908         struct v4l2_requestbuffers req;
 909         unsigned int i;
 910         int ret;
 911
 912         req.type   = q->type;
 913         req.count  = 8;
 914         req.memory = V4L2_MEMORY_MMAP;
 915         ret = videobuf_reqbufs(q,&req);
 916         if (ret < 0)
 917                 return (ret);
 918
 919         mbuf->frames = req.count;
 920         mbuf->size   = 0;
 921         for (i = 0; i < mbuf->frames; i++) {
 922                 mbuf->offsets[i]  = q->bufs[i]->boff;
 923                 mbuf->size       += q->bufs[i]->bsize;
 924         }
 925         return (0);
 926 }
 927 #endif
 928
 929 static int vidioc_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
 930 {
 931         struct vivi_fh  *fh=priv;
 932         struct vivi_dev *dev    = fh->dev;
 933
 934         if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 935                 return -EINVAL;
 936         if (i != fh->type)
 937                 return -EINVAL;
 938
 939         if (!res_get(dev,fh))
 940                 return -EBUSY;
 941         return (videobuf_streamon(&fh->vb_vidq));
 942 }
 943
 944 static int vidioc_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
 945 {
 946         struct vivi_fh  *fh=priv;
 947         struct vivi_dev *dev    = fh->dev;
 948
 949         if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 950                 return -EINVAL;
 951         if (i != fh->type)
 952                 return -EINVAL;
 953
 954         videobuf_streamoff(&fh->vb_vidq);
 955         res_free(dev,fh);
 956
 957         return (0);
 958 }
 959
 960 static int vidioc_s_std (struct file *file, void *priv, v4l2_std_id *i)
 961 {
 962         return 0;
 963 }
 964
 965 /* only one input in this sample driver */
 966 static int vidioc_enum_input (struct file *file, void *priv,
 967                                 struct v4l2_input *inp)
 968 {
 969         if (inp->index != 0)
 970                 return -EINVAL;
 971
 972         inp->type = V4L2_INPUT_TYPE_CAMERA;
 973         inp->std = V4L2_STD_NTSC_M;
 974         strcpy(inp->name,"Camera");
 975
 976         return (0);
 977 }
 978
 979 static int vidioc_g_input (struct file *file, void *priv, unsigned int *i)
 980 {
 981         *i = 0;
 982
 983         return (0);
 984 }
 985 static int vidioc_s_input (struct file *file, void *priv, unsigned int i)
 986 {
 987         if (i > 0)
 988                 return -EINVAL;
 989
 990         return (0);
 991 }
 992
 993         /* --- controls ---------------------------------------------- */
 994 static int vidioc_queryctrl (struct file *file, void *priv,
 995                                 struct v4l2_queryctrl *qc)
 996 {
 997         int i;
 998
 999         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1000                 if (qc->id && qc->id == vivi_qctrl[i].id) {
1001                         memcpy(qc, &(vivi_qctrl[i]),
1002                                 sizeof(*qc));
1003                         return (0);
1004                 }
1005
1006         return -EINVAL;
1007 }
1008
1009 static int vidioc_g_ctrl (struct file *file, void *priv,
1010                                 struct v4l2_control *ctrl)
1011 {
1012         int i;
1013
1014         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1015                 if (ctrl->id == vivi_qctrl[i].id) {
1016                         ctrl->value=qctl_regs[i];
1017                         return (0);
1018                 }
1019
1020         return -EINVAL;
1021 }
1022 static int vidioc_s_ctrl (struct file *file, void *priv,
1023                                 struct v4l2_control *ctrl)
1024 {
1025         int i;
1026
1027         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1028                 if (ctrl->id == vivi_qctrl[i].id) {
1029                         if (ctrl->value <
1030                                 vivi_qctrl[i].minimum
1031                                 || ctrl->value >
1032                                 vivi_qctrl[i].maximum) {
1033                                         return (-ERANGE);
1034                                 }
1035                         qctl_regs[i]=ctrl->value;
1036                         return (0);
1037                 }
1038         return -EINVAL;
1039 }
1040
1041 /* ------------------------------------------------------------------
1042         File operations for the device
1043    ------------------------------------------------------------------*/
1044
1045 #define line_buf_size(norm) (norm_maxw(norm)*(format.depth+7)/8)
1046
1047 static int vivi_open(struct inode *inode, struct file *file)
1048 {
1049         int minor = iminor(inode);
1050         struct vivi_dev *h,*dev = NULL;
1051         struct vivi_fh *fh;
1052         struct list_head *list;
1053         enum v4l2_buf_type type = 0;
1054         int i;
1055
1056         printk(KERN_DEBUG "vivi: open called (minor=%d)\n",minor);
1057
1058         list_for_each(list,&vivi_devlist) {
1059                 h = list_entry(list, struct vivi_dev, vivi_devlist);
1060                 if (h->vfd.minor == minor) {
1061                         dev  = h;
1062                         type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1063                 }
1064         }
1065         if (NULL == dev)
1066                 return -ENODEV;
1067
1068
1069
1070         /* If more than one user, mutex should be added */
1071         dev->users++;
1072
1073         dprintk(1,"open minor=%d type=%s users=%d\n",
1074                                 minor,v4l2_type_names[type],dev->users);
1075
1076         /* allocate + initialize per filehandle data */
1077         fh = kzalloc(sizeof(*fh),GFP_KERNEL);
1078         if (NULL == fh) {
1079                 dev->users--;
1080                 return -ENOMEM;
1081         }
1082
1083         file->private_data = fh;
1084         fh->dev      = dev;
1085
1086         fh->type     = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1087         fh->fmt      = &format;
1088         fh->width    = 640;
1089         fh->height   = 480;
1090
1091         /* Put all controls at a sane state */
1092         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1093                 qctl_regs[i] =vivi_qctrl[i].default_value;
1094
1095         dprintk(1,"Open: fh=0x%08lx, dev=0x%08lx, dev->vidq=0x%08lx\n",
1096                 (unsigned long)fh,(unsigned long)dev,(unsigned long)&dev->vidq);
1097         dprintk(1,"Open: list_empty queued=%d\n",list_empty(&dev->vidq.queued));
1098         dprintk(1,"Open: list_empty active=%d\n",list_empty(&dev->vidq.active));
1099
1100         /* Resets frame counters */
1101         dev->h=0;
1102         dev->m=0;
1103         dev->s=0;
1104         dev->us=0;
1105         dev->jiffies=jiffies;
1106         sprintf(dev->timestr,"%02d:%02d:%02d:%03d",
1107                         dev->h,dev->m,dev->s,(dev->us+500)/1000);
1108
1109         videobuf_queue_init(&fh->vb_vidq, &vivi_video_qops,
1110                         NULL, NULL,
1111                         fh->type,
1112                         V4L2_FIELD_INTERLACED,
1113                         sizeof(struct vivi_buffer),fh);
1114
1115         return 0;
1116 }
1117
1118 static ssize_t
1119 vivi_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
1120 {
1121         struct vivi_fh        *fh = file->private_data;
1122
1123         if (fh->type==V4L2_BUF_TYPE_VIDEO_CAPTURE) {
1124                 if (res_locked(fh->dev))
1125                         return -EBUSY;
1126                 return videobuf_read_stream(&fh->vb_vidq, data, count, ppos, 0,
1127                                         file->f_flags & O_NONBLOCK);
1128         }
1129         return 0;
1130 }
1131
1132 static unsigned int
1133 vivi_poll(struct file *file, struct poll_table_struct *wait)
1134 {
1135         struct vivi_fh        *fh = file->private_data;
1136         struct vivi_buffer    *buf;
1137
1138         dprintk(1,"%s\n",__FUNCTION__);
1139
1140         if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
1141                 return POLLERR;
1142
1143         if (res_get(fh->dev,fh)) {
1144                 dprintk(1,"poll: mmap interface\n");
1145                 /* streaming capture */
1146                 if (list_empty(&fh->vb_vidq.stream))
1147                         return POLLERR;
1148                 buf = list_entry(fh->vb_vidq.stream.next,struct vivi_buffer,vb.stream);
1149         } else {
1150                 dprintk(1,"poll: read() interface\n");
1151                 /* read() capture */
1152                 buf = (struct vivi_buffer*)fh->vb_vidq.read_buf;
1153                 if (NULL == buf)
1154                         return POLLERR;
1155         }
1156         poll_wait(file, &buf->vb.done, wait);
1157         if (buf->vb.state == STATE_DONE ||
1158             buf->vb.state == STATE_ERROR)
1159                 return POLLIN|POLLRDNORM;
1160         return 0;
1161 }
1162
1163 static int vivi_release(struct inode *inode, struct file *file)
1164 {
1165         struct vivi_fh         *fh = file->private_data;
1166         struct vivi_dev *dev       = fh->dev;
1167         struct vivi_dmaqueue *vidq = &dev->vidq;
1168
1169         int minor = iminor(inode);
1170
1171         vivi_stop_thread(vidq);
1172         videobuf_mmap_free(&fh->vb_vidq);
1173
1174         kfree (fh);
1175
1176         dev->users--;
1177
1178         printk(KERN_DEBUG "vivi: close called (minor=%d, users=%d)\n",minor,dev->users);
1179
1180         return 0;
1181 }
1182
1183 static int
1184 vivi_mmap(struct file *file, struct vm_area_struct * vma)
1185 {
1186         struct vivi_fh        *fh = file->private_data;
1187         int ret;
1188
1189         dprintk (1,"mmap called, vma=0x%08lx\n",(unsigned long)vma);
1190
1191         ret=videobuf_mmap_mapper(&fh->vb_vidq, vma);
1192
1193         dprintk (1,"vma start=0x%08lx, size=%ld, ret=%d\n",
1194                 (unsigned long)vma->vm_start,
1195                 (unsigned long)vma->vm_end-(unsigned long)vma->vm_start,
1196                 ret);
1197
1198         return ret;
1199 }
1200
1201 static const struct file_operations vivi_fops = {
1202         .owner          = THIS_MODULE,
1203         .open           = vivi_open,
1204         .release        = vivi_release,
1205         .read           = vivi_read,
1206         .poll           = vivi_poll,
1207         .ioctl          = video_ioctl2, /* V4L2 ioctl handler */
1208         .mmap           = vivi_mmap,
1209         .llseek         = no_llseek,
1210 };
1211
1212 static struct video_device vivi = {
1213         .name           = "vivi",
1214         .type           = VID_TYPE_CAPTURE,
1215         .hardware       = 0,
1216         .fops           = &vivi_fops,
1217         .minor          = -1,
1218 //      .release        = video_device_release,
1219
1220         .vidioc_querycap      = vidioc_querycap,
1221         .vidioc_enum_fmt_cap  = vidioc_enum_fmt_cap,
1222         .vidioc_g_fmt_cap     = vidioc_g_fmt_cap,
1223         .vidioc_try_fmt_cap   = vidioc_try_fmt_cap,
1224         .vidioc_s_fmt_cap     = vidioc_s_fmt_cap,
1225         .vidioc_reqbufs       = vidioc_reqbufs,
1226         .vidioc_querybuf      = vidioc_querybuf,
1227         .vidioc_qbuf          = vidioc_qbuf,
1228         .vidioc_dqbuf         = vidioc_dqbuf,
1229         .vidioc_s_std         = vidioc_s_std,
1230         .vidioc_enum_input    = vidioc_enum_input,
1231         .vidioc_g_input       = vidioc_g_input,
1232         .vidioc_s_input       = vidioc_s_input,
1233         .vidioc_queryctrl     = vidioc_queryctrl,
1234         .vidioc_g_ctrl        = vidioc_g_ctrl,
1235         .vidioc_s_ctrl        = vidioc_s_ctrl,
1236         .vidioc_streamon      = vidioc_streamon,
1237         .vidioc_streamoff     = vidioc_streamoff,
1238 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1239         .vidiocgmbuf          = vidiocgmbuf,
1240 #endif
1241         .tvnorms              = V4L2_STD_NTSC_M,
1242         .current_norm         = V4L2_STD_NTSC_M,
1243 };
1244 /* -----------------------------------------------------------------
1245         Initialization and module stuff
1246    ------------------------------------------------------------------*/
1247
1248 static int __init vivi_init(void)
1249 {
1250         int ret;
1251         struct vivi_dev *dev;
1252
1253         dev = kzalloc(sizeof(*dev),GFP_KERNEL);
1254         if (NULL == dev)
1255                 return -ENOMEM;
1256         list_add_tail(&dev->vivi_devlist,&vivi_devlist);
1257
1258         /* init video dma queues */
1259         INIT_LIST_HEAD(&dev->vidq.active);
1260         INIT_LIST_HEAD(&dev->vidq.queued);
1261         init_waitqueue_head(&dev->vidq.wq);
1262
1263         /* initialize locks */
1264         mutex_init(&dev->lock);
1265
1266         dev->vidq.timeout.function = vivi_vid_timeout;
1267         dev->vidq.timeout.data     = (unsigned long)dev;
1268         init_timer(&dev->vidq.timeout);
1269
1270         ret = video_register_device(&vivi, VFL_TYPE_GRABBER, video_nr);
1271         printk(KERN_INFO "Video Technology Magazine Virtual Video Capture Board (Load status: %d)\n", ret);
1272         return ret;
1273 }
1274
1275 static void __exit vivi_exit(void)
1276 {
1277         struct vivi_dev *h;
1278         struct list_head *list;
1279
1280         while (!list_empty(&vivi_devlist)) {
1281                 list = vivi_devlist.next;
1282                 list_del(list);
1283                 h = list_entry(list, struct vivi_dev, vivi_devlist);
1284                 kfree (h);
1285         }
1286         video_unregister_device(&vivi);
1287 }
1288
1289 module_init(vivi_init);
1290 module_exit(vivi_exit);
1291
1292 MODULE_DESCRIPTION("Video Technology Magazine Virtual Video Capture Board");
1293 MODULE_AUTHOR("Mauro Carvalho Chehab, Ted Walther and John Sokol");
1294 MODULE_LICENSE("Dual BSD/GPL");
1295
1296 module_param(video_nr, int, 0);
1297
1298 module_param_named(debug,vivi.debug, int, 0644);
1299 MODULE_PARM_DESC(debug,"activates debug info");
1300
1301 module_param(vid_limit,int,0644);
1302 MODULE_PARM_DESC(vid_limit,"capture memory limit in megabytes");
1303