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 /* 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 struct vivi_dmaqueue {
 151         struct list_head       active;
 152         struct list_head       queued;
 153         struct timer_list      timeout;
 154
 155         /* thread for generating video stream*/
 156         struct task_struct         *kthread;
 157         wait_queue_head_t          wq;
 158         /* Counters to control fps rate */
 159         int                        frame;
 160         int                        ini_jiffies;
 161 };
 162
 163 static LIST_HEAD(vivi_devlist);
 164
 165 struct vivi_dev {
 166         struct list_head           vivi_devlist;
 167
 168         struct mutex               lock;
 169
 170         int                        users;
 171
 172         /* various device info */
 173         unsigned int               resources;
 174         struct video_device        vfd;
 175
 176         struct vivi_dmaqueue       vidq;
 177
 178         /* Several counters */
 179         int                        h,m,s,us,jiffies;
 180         char                       timestr[13];
 181 };
 182
 183 struct vivi_fh {
 184         struct vivi_dev            *dev;
 185
 186         /* video capture */
 187         struct vivi_fmt            *fmt;
 188         unsigned int               width,height;
 189         struct videobuf_queue      vb_vidq;
 190
 191         enum v4l2_buf_type         type;
 192 };
 193
 194 /* ------------------------------------------------------------------
 195         DMA and thread functions
 196    ------------------------------------------------------------------*/
 197
 198 /* Bars and Colors should match positions */
 199
 200 enum colors {
 201         WHITE,
 202         AMBAR,
 203         CYAN,
 204         GREEN,
 205         MAGENTA,
 206         RED,
 207         BLUE
 208 };
 209
 210 static u8 bars[8][3] = {
 211         /* R   G   B */
 212         {204,204,204},  /* white */
 213         {208,208,  0},  /* ambar */
 214         {  0,206,206},  /* cyan */
 215         {  0,239,  0},  /* green */
 216         {239,  0,239},  /* magenta */
 217         {205,  0,  0},  /* red */
 218         {  0,  0,255},  /* blue */
 219         {  0,  0,  0}
 220 };
 221
 222 #define TO_Y(r,g,b) (((16829*r +33039*g +6416*b  + 32768)>>16)+16)
 223 /* RGB to  V(Cr) Color transform */
 224 #define TO_V(r,g,b) (((28784*r -24103*g -4681*b  + 32768)>>16)+128)
 225 /* RGB to  U(Cb) Color transform */
 226 #define TO_U(r,g,b) (((-9714*r -19070*g +28784*b + 32768)>>16)+128)
 227
 228 #define TSTAMP_MIN_Y 24
 229 #define TSTAMP_MAX_Y TSTAMP_MIN_Y+15
 230 #define TSTAMP_MIN_X 64
 231
 232
 233 static void gen_line(char *basep,int inipos,int wmax,
 234                      int hmax, int line, char *timestr)
 235 {
 236         int  w,i,j,pos=inipos,y;
 237         char *p,*s;
 238         u8   chr,r,g,b,color;
 239
 240         /* We will just duplicate the second pixel at the packet */
 241         wmax/=2;
 242
 243         /* Generate a standard color bar pattern */
 244         for (w=0;w<wmax;w++) {
 245                 r=bars[w*7/wmax][0];
 246                 g=bars[w*7/wmax][1];
 247                 b=bars[w*7/wmax][2];
 248
 249                 for (color=0;color<4;color++) {
 250                         p=basep+pos;
 251
 252                         switch (color) {
 253                                 case 0:
 254                                 case 2:
 255                                         *p=TO_Y(r,g,b);         /* Luminance */
 256                                         break;
 257                                 case 1:
 258                                         *p=TO_U(r,g,b);         /* Cb */
 259                                         break;
 260                                 case 3:
 261                                         *p=TO_V(r,g,b);         /* Cr */
 262                                         break;
 263                         }
 264                         pos++;
 265                 }
 266         }
 267
 268         /* Checks if it is possible to show timestamp */
 269         if (TSTAMP_MAX_Y>=hmax)
 270                 goto end;
 271         if (TSTAMP_MIN_X+strlen(timestr)>=wmax)
 272                 goto end;
 273
 274         /* Print stream time */
 275         if (line>=TSTAMP_MIN_Y && line<=TSTAMP_MAX_Y) {
 276                 j=TSTAMP_MIN_X;
 277                 for (s=timestr;*s;s++) {
 278                         chr=rom8x16_bits[(*s-0x30)*16+line-TSTAMP_MIN_Y];
 279                         for (i=0;i<7;i++) {
 280                                 if (chr&1<<(7-i)) { /* Font color*/
 281                                         r=bars[BLUE][0];
 282                                         g=bars[BLUE][1];
 283                                         b=bars[BLUE][2];
 284                                         r=g=b=0;
 285                                         g=198;
 286                                 } else { /* Background color */
 287                                         r=bars[WHITE][0];
 288                                         g=bars[WHITE][1];
 289                                         b=bars[WHITE][2];
 290                                         r=g=b=0;
 291                                 }
 292
 293                                 pos=inipos+j*2;
 294                                 for (color=0;color<4;color++) {
 295                                         p=basep+pos;
 296
 297                                         y=TO_Y(r,g,b);
 298
 299                                         switch (color) {
 300                                                 case 0:
 301                                                 case 2:
 302                                                         *p=TO_Y(r,g,b);         /* Luminance */
 303                                                         break;
 304                                                 case 1:
 305                                                         *p=TO_U(r,g,b);         /* Cb */
 306                                                         break;
 307                                                 case 3:
 308                                                         *p=TO_V(r,g,b);         /* Cr */
 309                                                         break;
 310                                         }
 311                                         pos++;
 312                                 }
 313                                 j++;
 314                         }
 315                 }
 316         }
 317
 318
 319 end:
 320         return;
 321 }
 322 static void vivi_fillbuff(struct vivi_dev *dev,struct vivi_buffer *buf)
 323 {
 324         int h,pos=0;
 325         int hmax  = buf->vb.height;
 326         int wmax  = buf->vb.width;
 327         struct timeval ts;
 328         char *tmpbuf = kmalloc(wmax*2,GFP_KERNEL);
 329         void *vbuf=videobuf_to_vmalloc (&buf->vb);
 330
 331         if (!tmpbuf)
 332                 return;
 333
 334         for (h=0;h<hmax;h++) {
 335                 gen_line(tmpbuf,0,wmax,hmax,h,dev->timestr);
 336                 /* FIXME: replacing to __copy_to_user */
 337                 if (copy_to_user(vbuf+pos,tmpbuf,wmax*2)!=0)
 338                         dprintk(2,"vivifill copy_to_user failed.\n");
 339                 pos += wmax*2;
 340         }
 341
 342         kfree(tmpbuf);
 343
 344         /* Updates stream time */
 345
 346         dev->us+=jiffies_to_usecs(jiffies-dev->jiffies);
 347         dev->jiffies=jiffies;
 348         if (dev->us>=1000000) {
 349                 dev->us-=1000000;
 350                 dev->s++;
 351                 if (dev->s>=60) {
 352                         dev->s-=60;
 353                         dev->m++;
 354                         if (dev->m>60) {
 355                                 dev->m-=60;
 356                                 dev->h++;
 357                                 if (dev->h>24)
 358                                         dev->h-=24;
 359                         }
 360                 }
 361         }
 362         sprintf(dev->timestr,"%02d:%02d:%02d:%03d",
 363                         dev->h,dev->m,dev->s,(dev->us+500)/1000);
 364
 365         dprintk(2,"vivifill at %s: Buffer 0x%08lx size= %d\n",dev->timestr,
 366                         (unsigned long)tmpbuf,pos);
 367
 368         /* Advice that buffer was filled */
 369         buf->vb.state = STATE_DONE;
 370         buf->vb.field_count++;
 371         do_gettimeofday(&ts);
 372         buf->vb.ts = ts;
 373
 374         list_del(&buf->vb.queue);
 375         wake_up(&buf->vb.done);
 376 }
 377
 378 static int restart_video_queue(struct vivi_dmaqueue *dma_q);
 379
 380 static void vivi_thread_tick(struct vivi_dmaqueue  *dma_q)
 381 {
 382         struct vivi_buffer    *buf;
 383         struct vivi_dev *dev= container_of(dma_q,struct vivi_dev,vidq);
 384
 385         int bc;
 386
 387         /* Announces videobuf that all went ok */
 388         for (bc = 0;; bc++) {
 389                 if (list_empty(&dma_q->active)) {
 390                         dprintk(1,"No active queue to serve\n");
 391                         break;
 392                 }
 393
 394                 buf = list_entry(dma_q->active.next,
 395                                  struct vivi_buffer, vb.queue);
 396
 397                 /* Nobody is waiting something to be done, just return */
 398                 if (!waitqueue_active(&buf->vb.done)) {
 399                         mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
 400                         return;
 401                 }
 402
 403                 do_gettimeofday(&buf->vb.ts);
 404                 dprintk(2,"[%p/%d] wakeup\n",buf,buf->vb.i);
 405
 406                 /* Fill buffer */
 407                 vivi_fillbuff(dev,buf);
 408
 409                 if (list_empty(&dma_q->active)) {
 410                         del_timer(&dma_q->timeout);
 411                 } else {
 412                         mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
 413                 }
 414         }
 415         if (bc != 1)
 416                 dprintk(1,"%s: %d buffers handled (should be 1)\n",__FUNCTION__,bc);
 417 }
 418
 419 static void vivi_sleep(struct vivi_dmaqueue  *dma_q)
 420 {
 421         int timeout;
 422         DECLARE_WAITQUEUE(wait, current);
 423
 424         dprintk(1,"%s dma_q=0x%08lx\n",__FUNCTION__,(unsigned long)dma_q);
 425
 426         add_wait_queue(&dma_q->wq, &wait);
 427         if (!kthread_should_stop()) {
 428                 dma_q->frame++;
 429
 430                 /* Calculate time to wake up */
 431                 timeout=dma_q->ini_jiffies+msecs_to_jiffies((dma_q->frame*WAKE_NUMERATOR*1000)/WAKE_DENOMINATOR)-jiffies;
 432
 433                 if (timeout <= 0) {
 434                         int old=dma_q->frame;
 435                         dma_q->frame=(jiffies_to_msecs(jiffies-dma_q->ini_jiffies)*WAKE_DENOMINATOR)/(WAKE_NUMERATOR*1000)+1;
 436
 437                         timeout=dma_q->ini_jiffies+msecs_to_jiffies((dma_q->frame*WAKE_NUMERATOR*1000)/WAKE_DENOMINATOR)-jiffies;
 438
 439                         dprintk(1,"underrun, losed %d frames. "
 440                                   "Now, frame is %d. Waking on %d jiffies\n",
 441                                         dma_q->frame-old,dma_q->frame,timeout);
 442                 } else
 443                         dprintk(1,"will sleep for %i jiffies\n",timeout);
 444
 445                 vivi_thread_tick(dma_q);
 446
 447                 schedule_timeout_interruptible (timeout);
 448         }
 449
 450         remove_wait_queue(&dma_q->wq, &wait);
 451         try_to_freeze();
 452 }
 453
 454 static int vivi_thread(void *data)
 455 {
 456         struct vivi_dmaqueue  *dma_q=data;
 457
 458         dprintk(1,"thread started\n");
 459
 460         mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
 461         set_freezable();
 462
 463         for (;;) {
 464                 vivi_sleep(dma_q);
 465
 466                 if (kthread_should_stop())
 467                         break;
 468         }
 469         dprintk(1, "thread: exit\n");
 470         return 0;
 471 }
 472
 473 static int vivi_start_thread(struct vivi_dmaqueue  *dma_q)
 474 {
 475         dma_q->frame=0;
 476         dma_q->ini_jiffies=jiffies;
 477
 478         dprintk(1,"%s\n",__FUNCTION__);
 479
 480         dma_q->kthread = kthread_run(vivi_thread, dma_q, "vivi");
 481
 482         if (IS_ERR(dma_q->kthread)) {
 483                 printk(KERN_ERR "vivi: kernel_thread() failed\n");
 484                 return PTR_ERR(dma_q->kthread);
 485         }
 486         /* Wakes thread */
 487         wake_up_interruptible(&dma_q->wq);
 488
 489         dprintk(1,"returning from %s\n",__FUNCTION__);
 490         return 0;
 491 }
 492
 493 static void vivi_stop_thread(struct vivi_dmaqueue  *dma_q)
 494 {
 495         dprintk(1,"%s\n",__FUNCTION__);
 496         /* shutdown control thread */
 497         if (dma_q->kthread) {
 498                 kthread_stop(dma_q->kthread);
 499                 dma_q->kthread=NULL;
 500         }
 501 }
 502
 503 static int restart_video_queue(struct vivi_dmaqueue *dma_q)
 504 {
 505         struct vivi_buffer *buf, *prev;
 506         struct list_head *item;
 507
 508         dprintk(1,"%s dma_q=0x%08lx\n",__FUNCTION__,(unsigned long)dma_q);
 509
 510         if (!list_empty(&dma_q->active)) {
 511                 buf = list_entry(dma_q->active.next, struct vivi_buffer, vb.queue);
 512                 dprintk(2,"restart_queue [%p/%d]: restart dma\n",
 513                         buf, buf->vb.i);
 514
 515                 dprintk(1,"Restarting video dma\n");
 516                 vivi_stop_thread(dma_q);
 517 //              vivi_start_thread(dma_q);
 518
 519                 /* cancel all outstanding capture / vbi requests */
 520                 list_for_each(item,&dma_q->active) {
 521                         buf = list_entry(item, struct vivi_buffer, vb.queue);
 522
 523                         list_del(&buf->vb.queue);
 524                         buf->vb.state = STATE_ERROR;
 525                         wake_up(&buf->vb.done);
 526                 }
 527                 mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
 528
 529                 return 0;
 530         }
 531
 532         prev = NULL;
 533         for (;;) {
 534                 if (list_empty(&dma_q->queued))
 535                         return 0;
 536                 buf = list_entry(dma_q->queued.next, struct vivi_buffer, vb.queue);
 537                 if (NULL == prev) {
 538                         list_del(&buf->vb.queue);
 539                         list_add_tail(&buf->vb.queue,&dma_q->active);
 540
 541                         dprintk(1,"Restarting video dma\n");
 542                         vivi_stop_thread(dma_q);
 543                         vivi_start_thread(dma_q);
 544
 545                         buf->vb.state = STATE_ACTIVE;
 546                         mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
 547                         dprintk(2,"[%p/%d] restart_queue - first active\n",
 548                                 buf,buf->vb.i);
 549
 550                 } else if (prev->vb.width  == buf->vb.width  &&
 551                            prev->vb.height == buf->vb.height &&
 552                            prev->fmt       == buf->fmt) {
 553                         list_del(&buf->vb.queue);
 554                         list_add_tail(&buf->vb.queue,&dma_q->active);
 555                         buf->vb.state = STATE_ACTIVE;
 556                         dprintk(2,"[%p/%d] restart_queue - move to active\n",
 557                                 buf,buf->vb.i);
 558                 } else {
 559                         return 0;
 560                 }
 561                 prev = buf;
 562         }
 563 }
 564
 565 static void vivi_vid_timeout(unsigned long data)
 566 {
 567         struct vivi_dev      *dev  = (struct vivi_dev*)data;
 568         struct vivi_dmaqueue *vidq = &dev->vidq;
 569         struct vivi_buffer   *buf;
 570
 571         while (!list_empty(&vidq->active)) {
 572                 buf = list_entry(vidq->active.next, struct vivi_buffer, vb.queue);
 573                 list_del(&buf->vb.queue);
 574                 buf->vb.state = STATE_ERROR;
 575                 wake_up(&buf->vb.done);
 576                 printk("vivi/0: [%p/%d] timeout\n", buf, buf->vb.i);
 577         }
 578
 579         restart_video_queue(vidq);
 580 }
 581
 582 /* ------------------------------------------------------------------
 583         Videobuf operations
 584    ------------------------------------------------------------------*/
 585 static int
 586 buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
 587 {
 588         struct vivi_fh *fh = vq->priv_data;
 589
 590         *size = fh->width*fh->height*2;
 591
 592         if (0 == *count)
 593                 *count = 32;
 594
 595         while (*size * *count > vid_limit * 1024 * 1024)
 596                 (*count)--;
 597
 598         dprintk(1,"%s, count=%d, size=%d\n",__FUNCTION__,*count, *size);
 599
 600         return 0;
 601 }
 602
 603 static void free_buffer(struct videobuf_queue *vq, struct vivi_buffer *buf)
 604 {
 605         dprintk(1,"%s\n",__FUNCTION__);
 606
 607         if (in_interrupt())
 608                 BUG();
 609
 610         videobuf_waiton(&buf->vb,0,0);
 611         videobuf_vmalloc_free(&buf->vb);
 612         buf->vb.state = STATE_NEEDS_INIT;
 613 }
 614
 615 #define norm_maxw() 1024
 616 #define norm_maxh() 768
 617 static int
 618 buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
 619                                                 enum v4l2_field field)
 620 {
 621         struct vivi_fh     *fh  = vq->priv_data;
 622         struct vivi_buffer *buf = container_of(vb,struct vivi_buffer,vb);
 623         int rc, init_buffer = 0;
 624
 625         dprintk(1,"%s, field=%d\n",__FUNCTION__,field);
 626
 627         BUG_ON(NULL == fh->fmt);
 628         if (fh->width  < 48 || fh->width  > norm_maxw() ||
 629             fh->height < 32 || fh->height > norm_maxh())
 630                 return -EINVAL;
 631         buf->vb.size = fh->width*fh->height*2;
 632         if (0 != buf->vb.baddr  &&  buf->vb.bsize < buf->vb.size)
 633                 return -EINVAL;
 634
 635         if (buf->fmt       != fh->fmt    ||
 636             buf->vb.width  != fh->width  ||
 637             buf->vb.height != fh->height ||
 638         buf->vb.field  != field) {
 639                 buf->fmt       = fh->fmt;
 640                 buf->vb.width  = fh->width;
 641                 buf->vb.height = fh->height;
 642                 buf->vb.field  = field;
 643                 init_buffer = 1;
 644         }
 645
 646         if (STATE_NEEDS_INIT == buf->vb.state) {
 647                 if (0 != (rc = videobuf_iolock(vq,&buf->vb,NULL)))
 648                         goto fail;
 649         }
 650
 651         buf->vb.state = STATE_PREPARED;
 652
 653         return 0;
 654
 655 fail:
 656         free_buffer(vq,buf);
 657         return rc;
 658 }
 659
 660 static void
 661 buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 662 {
 663         struct vivi_buffer    *buf     = container_of(vb,struct vivi_buffer,vb);
 664         struct vivi_fh        *fh      = vq->priv_data;
 665         struct vivi_dev       *dev     = fh->dev;
 666         struct vivi_dmaqueue  *vidq    = &dev->vidq;
 667         struct vivi_buffer    *prev;
 668
 669         if (!list_empty(&vidq->queued)) {
 670                 dprintk(1,"adding vb queue=0x%08lx\n",(unsigned long)&buf->vb.queue);
 671                 list_add_tail(&buf->vb.queue,&vidq->queued);
 672                 buf->vb.state = STATE_QUEUED;
 673                 dprintk(2,"[%p/%d] buffer_queue - append to queued\n",
 674                         buf, buf->vb.i);
 675         } else if (list_empty(&vidq->active)) {
 676                 list_add_tail(&buf->vb.queue,&vidq->active);
 677
 678                 buf->vb.state = STATE_ACTIVE;
 679                 mod_timer(&vidq->timeout, jiffies+BUFFER_TIMEOUT);
 680                 dprintk(2,"[%p/%d] buffer_queue - first active\n",
 681                         buf, buf->vb.i);
 682
 683                 vivi_start_thread(vidq);
 684         } else {
 685                 prev = list_entry(vidq->active.prev, struct vivi_buffer, vb.queue);
 686                 if (prev->vb.width  == buf->vb.width  &&
 687                     prev->vb.height == buf->vb.height &&
 688                     prev->fmt       == buf->fmt) {
 689                         list_add_tail(&buf->vb.queue,&vidq->active);
 690                         buf->vb.state = STATE_ACTIVE;
 691                         dprintk(2,"[%p/%d] buffer_queue - append to active\n",
 692                                 buf, buf->vb.i);
 693
 694                 } else {
 695                         list_add_tail(&buf->vb.queue,&vidq->queued);
 696                         buf->vb.state = STATE_QUEUED;
 697                         dprintk(2,"[%p/%d] buffer_queue - first queued\n",
 698                                 buf, buf->vb.i);
 699                 }
 700         }
 701 }
 702
 703 static void buffer_release(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 704 {
 705         struct vivi_buffer   *buf  = container_of(vb,struct vivi_buffer,vb);
 706         struct vivi_fh       *fh   = vq->priv_data;
 707         struct vivi_dev      *dev  = (struct vivi_dev*)fh->dev;
 708         struct vivi_dmaqueue *vidq = &dev->vidq;
 709
 710         dprintk(1,"%s\n",__FUNCTION__);
 711
 712         vivi_stop_thread(vidq);
 713
 714         free_buffer(vq,buf);
 715 }
 716
 717 static struct videobuf_queue_ops vivi_video_qops = {
 718         .buf_setup      = buffer_setup,
 719         .buf_prepare    = buffer_prepare,
 720         .buf_queue      = buffer_queue,
 721         .buf_release    = buffer_release,
 722 };
 723
 724 /* ------------------------------------------------------------------
 725         IOCTL handling
 726    ------------------------------------------------------------------*/
 727
 728
 729 static int res_get(struct vivi_dev *dev, struct vivi_fh *fh)
 730 {
 731         /* is it free? */
 732         mutex_lock(&dev->lock);
 733         if (dev->resources) {
 734                 /* no, someone else uses it */
 735                 mutex_unlock(&dev->lock);
 736                 return 0;
 737         }
 738         /* it's free, grab it */
 739         dev->resources =1;
 740         dprintk(1,"res: get\n");
 741         mutex_unlock(&dev->lock);
 742         return 1;
 743 }
 744
 745 static int res_locked(struct vivi_dev *dev)
 746 {
 747         return (dev->resources);
 748 }
 749
 750 static void res_free(struct vivi_dev *dev, struct vivi_fh *fh)
 751 {
 752         mutex_lock(&dev->lock);
 753         dev->resources = 0;
 754         dprintk(1,"res: put\n");
 755         mutex_lock(&dev->lock);
 756 }
 757
 758 /* ------------------------------------------------------------------
 759         IOCTL vidioc handling
 760    ------------------------------------------------------------------*/
 761 static int vidioc_querycap (struct file *file, void  *priv,
 762                                         struct v4l2_capability *cap)
 763 {
 764         strcpy(cap->driver, "vivi");
 765         strcpy(cap->card, "vivi");
 766         cap->version = VIVI_VERSION;
 767         cap->capabilities =     V4L2_CAP_VIDEO_CAPTURE |
 768                                 V4L2_CAP_STREAMING     |
 769                                 V4L2_CAP_READWRITE;
 770         return 0;
 771 }
 772
 773 static int vidioc_enum_fmt_cap (struct file *file, void  *priv,
 774                                         struct v4l2_fmtdesc *f)
 775 {
 776         if (f->index > 0)
 777                 return -EINVAL;
 778
 779         strlcpy(f->description,format.name,sizeof(f->description));
 780         f->pixelformat = format.fourcc;
 781         return 0;
 782 }
 783
 784 static int vidioc_g_fmt_cap (struct file *file, void *priv,
 785                                         struct v4l2_format *f)
 786 {
 787         struct vivi_fh  *fh=priv;
 788
 789         f->fmt.pix.width        = fh->width;
 790         f->fmt.pix.height       = fh->height;
 791         f->fmt.pix.field        = fh->vb_vidq.field;
 792         f->fmt.pix.pixelformat  = fh->fmt->fourcc;
 793         f->fmt.pix.bytesperline =
 794                 (f->fmt.pix.width * fh->fmt->depth) >> 3;
 795         f->fmt.pix.sizeimage =
 796                 f->fmt.pix.height * f->fmt.pix.bytesperline;
 797
 798         return (0);
 799 }
 800
 801 static int vidioc_try_fmt_cap (struct file *file, void *priv,
 802                         struct v4l2_format *f)
 803 {
 804         struct vivi_fmt *fmt;
 805         enum v4l2_field field;
 806         unsigned int maxw, maxh;
 807
 808         if (format.fourcc != f->fmt.pix.pixelformat) {
 809                 dprintk(1,"Fourcc format (0x%08x) invalid. Driver accepts "
 810                         "only 0x%08x\n",f->fmt.pix.pixelformat,format.fourcc);
 811                 return -EINVAL;
 812         }
 813         fmt=&format;
 814
 815         field = f->fmt.pix.field;
 816
 817         if (field == V4L2_FIELD_ANY) {
 818 //              field=V4L2_FIELD_INTERLACED;
 819                 field=V4L2_FIELD_SEQ_TB;
 820         } else if (V4L2_FIELD_INTERLACED != field) {
 821                 dprintk(1,"Field type invalid.\n");
 822                 return -EINVAL;
 823         }
 824
 825         maxw  = norm_maxw();
 826         maxh  = norm_maxh();
 827
 828         f->fmt.pix.field = field;
 829         if (f->fmt.pix.height < 32)
 830                 f->fmt.pix.height = 32;
 831         if (f->fmt.pix.height > maxh)
 832                 f->fmt.pix.height = maxh;
 833         if (f->fmt.pix.width < 48)
 834                 f->fmt.pix.width = 48;
 835         if (f->fmt.pix.width > maxw)
 836                 f->fmt.pix.width = maxw;
 837         f->fmt.pix.width &= ~0x03;
 838         f->fmt.pix.bytesperline =
 839                 (f->fmt.pix.width * fmt->depth) >> 3;
 840         f->fmt.pix.sizeimage =
 841                 f->fmt.pix.height * f->fmt.pix.bytesperline;
 842
 843         return 0;
 844 }
 845
 846 /*FIXME: This seems to be generic enough to be at videodev2 */
 847 static int vidioc_s_fmt_cap (struct file *file, void *priv,
 848                                         struct v4l2_format *f)
 849 {
 850         struct vivi_fh  *fh=priv;
 851         int ret = vidioc_try_fmt_cap(file,fh,f);
 852         if (ret < 0)
 853                 return (ret);
 854
 855         fh->fmt           = &format;
 856         fh->width         = f->fmt.pix.width;
 857         fh->height        = f->fmt.pix.height;
 858         fh->vb_vidq.field = f->fmt.pix.field;
 859         fh->type          = f->type;
 860
 861         return (0);
 862 }
 863
 864 static int vidioc_reqbufs (struct file *file, void *priv, struct v4l2_requestbuffers *p)
 865 {
 866         struct vivi_fh  *fh=priv;
 867
 868         return (videobuf_reqbufs(&fh->vb_vidq, p));
 869 }
 870
 871 static int vidioc_querybuf (struct file *file, void *priv, struct v4l2_buffer *p)
 872 {
 873         struct vivi_fh  *fh=priv;
 874
 875         return (videobuf_querybuf(&fh->vb_vidq, p));
 876 }
 877
 878 static int vidioc_qbuf (struct file *file, void *priv, struct v4l2_buffer *p)
 879 {
 880         struct vivi_fh  *fh=priv;
 881
 882         return (videobuf_qbuf(&fh->vb_vidq, p));
 883 }
 884
 885 static int vidioc_dqbuf (struct file *file, void *priv, struct v4l2_buffer *p)
 886 {
 887         struct vivi_fh  *fh=priv;
 888
 889         return (videobuf_dqbuf(&fh->vb_vidq, p,
 890                                 file->f_flags & O_NONBLOCK));
 891 }
 892
 893 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 894 static int vidiocgmbuf (struct file *file, void *priv, struct video_mbuf *mbuf)
 895 {
 896         struct vivi_fh  *fh=priv;
 897
 898         return videobuf_cgmbuf (&fh->vb_vidq, mbuf, 8);
 899 }
 900 #endif
 901
 902 static int vidioc_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
 903 {
 904         struct vivi_fh  *fh=priv;
 905         struct vivi_dev *dev    = fh->dev;
 906
 907         if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 908                 return -EINVAL;
 909         if (i != fh->type)
 910                 return -EINVAL;
 911
 912         if (!res_get(dev,fh))
 913                 return -EBUSY;
 914         return (videobuf_streamon(&fh->vb_vidq));
 915 }
 916
 917 static int vidioc_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
 918 {
 919         struct vivi_fh  *fh=priv;
 920         struct vivi_dev *dev    = fh->dev;
 921
 922         if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 923                 return -EINVAL;
 924         if (i != fh->type)
 925                 return -EINVAL;
 926
 927         videobuf_streamoff(&fh->vb_vidq);
 928         res_free(dev,fh);
 929
 930         return (0);
 931 }
 932
 933 static int vidioc_s_std (struct file *file, void *priv, v4l2_std_id *i)
 934 {
 935         return 0;
 936 }
 937
 938 /* only one input in this sample driver */
 939 static int vidioc_enum_input (struct file *file, void *priv,
 940                                 struct v4l2_input *inp)
 941 {
 942         if (inp->index != 0)
 943                 return -EINVAL;
 944
 945         inp->type = V4L2_INPUT_TYPE_CAMERA;
 946         inp->std = V4L2_STD_NTSC_M;
 947         strcpy(inp->name,"Camera");
 948
 949         return (0);
 950 }
 951
 952 static int vidioc_g_input (struct file *file, void *priv, unsigned int *i)
 953 {
 954         *i = 0;
 955
 956         return (0);
 957 }
 958 static int vidioc_s_input (struct file *file, void *priv, unsigned int i)
 959 {
 960         if (i > 0)
 961                 return -EINVAL;
 962
 963         return (0);
 964 }
 965
 966         /* --- controls ---------------------------------------------- */
 967 static int vidioc_queryctrl (struct file *file, void *priv,
 968                                 struct v4l2_queryctrl *qc)
 969 {
 970         int i;
 971
 972         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
 973                 if (qc->id && qc->id == vivi_qctrl[i].id) {
 974                         memcpy(qc, &(vivi_qctrl[i]),
 975                                 sizeof(*qc));
 976                         return (0);
 977                 }
 978
 979         return -EINVAL;
 980 }
 981
 982 static int vidioc_g_ctrl (struct file *file, void *priv,
 983                                 struct v4l2_control *ctrl)
 984 {
 985         int i;
 986
 987         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
 988                 if (ctrl->id == vivi_qctrl[i].id) {
 989                         ctrl->value=qctl_regs[i];
 990                         return (0);
 991                 }
 992
 993         return -EINVAL;
 994 }
 995 static int vidioc_s_ctrl (struct file *file, void *priv,
 996                                 struct v4l2_control *ctrl)
 997 {
 998         int i;
 999
1000         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1001                 if (ctrl->id == vivi_qctrl[i].id) {
1002                         if (ctrl->value <
1003                                 vivi_qctrl[i].minimum
1004                                 || ctrl->value >
1005                                 vivi_qctrl[i].maximum) {
1006                                         return (-ERANGE);
1007                                 }
1008                         qctl_regs[i]=ctrl->value;
1009                         return (0);
1010                 }
1011         return -EINVAL;
1012 }
1013
1014 /* ------------------------------------------------------------------
1015         File operations for the device
1016    ------------------------------------------------------------------*/
1017
1018 #define line_buf_size(norm) (norm_maxw(norm)*(format.depth+7)/8)
1019
1020 static int vivi_open(struct inode *inode, struct file *file)
1021 {
1022         int minor = iminor(inode);
1023         struct vivi_dev *h,*dev = NULL;
1024         struct vivi_fh *fh;
1025         struct list_head *list;
1026         enum v4l2_buf_type type = 0;
1027         int i;
1028
1029         printk(KERN_DEBUG "vivi: open called (minor=%d)\n",minor);
1030
1031         list_for_each(list,&vivi_devlist) {
1032                 h = list_entry(list, struct vivi_dev, vivi_devlist);
1033                 if (h->vfd.minor == minor) {
1034                         dev  = h;
1035                         type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1036                 }
1037         }
1038         if (NULL == dev)
1039                 return -ENODEV;
1040
1041
1042
1043         /* If more than one user, mutex should be added */
1044         dev->users++;
1045
1046         dprintk(1,"open minor=%d type=%s users=%d\n",
1047                                 minor,v4l2_type_names[type],dev->users);
1048
1049         /* allocate + initialize per filehandle data */
1050         fh = kzalloc(sizeof(*fh),GFP_KERNEL);
1051         if (NULL == fh) {
1052                 dev->users--;
1053                 return -ENOMEM;
1054         }
1055
1056         file->private_data = fh;
1057         fh->dev      = dev;
1058
1059         fh->type     = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1060         fh->fmt      = &format;
1061         fh->width    = 640;
1062         fh->height   = 480;
1063
1064         /* Put all controls at a sane state */
1065         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1066                 qctl_regs[i] =vivi_qctrl[i].default_value;
1067
1068         dprintk(1,"Open: fh=0x%08lx, dev=0x%08lx, dev->vidq=0x%08lx\n",
1069                 (unsigned long)fh,(unsigned long)dev,(unsigned long)&dev->vidq);
1070         dprintk(1,"Open: list_empty queued=%d\n",list_empty(&dev->vidq.queued));
1071         dprintk(1,"Open: list_empty active=%d\n",list_empty(&dev->vidq.active));
1072
1073         /* Resets frame counters */
1074         dev->h=0;
1075         dev->m=0;
1076         dev->s=0;
1077         dev->us=0;
1078         dev->jiffies=jiffies;
1079         sprintf(dev->timestr,"%02d:%02d:%02d:%03d",
1080                         dev->h,dev->m,dev->s,(dev->us+500)/1000);
1081
1082         videobuf_queue_vmalloc_init(&fh->vb_vidq, &vivi_video_qops,
1083                         NULL, NULL,
1084                         fh->type,
1085                         V4L2_FIELD_INTERLACED,
1086                         sizeof(struct vivi_buffer),fh);
1087
1088         return 0;
1089 }
1090
1091 static ssize_t
1092 vivi_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
1093 {
1094         struct vivi_fh        *fh = file->private_data;
1095
1096         if (fh->type==V4L2_BUF_TYPE_VIDEO_CAPTURE) {
1097                 if (res_locked(fh->dev))
1098                         return -EBUSY;
1099                 return videobuf_read_stream(&fh->vb_vidq, data, count, ppos, 0,
1100                                         file->f_flags & O_NONBLOCK);
1101         }
1102         return 0;
1103 }
1104
1105 static unsigned int
1106 vivi_poll(struct file *file, struct poll_table_struct *wait)
1107 {
1108         struct vivi_fh        *fh = file->private_data;
1109         struct vivi_buffer    *buf;
1110
1111         dprintk(1,"%s\n",__FUNCTION__);
1112
1113         if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
1114                 return POLLERR;
1115
1116         if (res_get(fh->dev,fh)) {
1117                 dprintk(1,"poll: mmap interface\n");
1118                 /* streaming capture */
1119                 if (list_empty(&fh->vb_vidq.stream))
1120                         return POLLERR;
1121                 buf = list_entry(fh->vb_vidq.stream.next,struct vivi_buffer,vb.stream);
1122         } else {
1123                 dprintk(1,"poll: read() interface\n");
1124                 /* read() capture */
1125                 return videobuf_poll_stream(file, &fh-> vb_vidq,
1126                                             wait);
1127         }
1128         poll_wait(file, &buf->vb.done, wait);
1129         if (buf->vb.state == STATE_DONE ||
1130             buf->vb.state == STATE_ERROR)
1131                 return POLLIN|POLLRDNORM;
1132         return 0;
1133 }
1134
1135 static int vivi_release(struct inode *inode, struct file *file)
1136 {
1137         struct vivi_fh         *fh = file->private_data;
1138         struct vivi_dev *dev       = fh->dev;
1139         struct vivi_dmaqueue *vidq = &dev->vidq;
1140
1141         int minor = iminor(inode);
1142
1143         vivi_stop_thread(vidq);
1144         videobuf_mmap_free(&fh->vb_vidq);
1145
1146         kfree (fh);
1147
1148         dev->users--;
1149
1150         printk(KERN_DEBUG "vivi: close called (minor=%d, users=%d)\n",minor,dev->users);
1151
1152         return 0;
1153 }
1154
1155 static int
1156 vivi_mmap(struct file *file, struct vm_area_struct * vma)
1157 {
1158         struct vivi_fh        *fh = file->private_data;
1159         int ret;
1160
1161         dprintk (1,"mmap called, vma=0x%08lx\n",(unsigned long)vma);
1162
1163         ret=videobuf_mmap_mapper(&fh->vb_vidq, vma);
1164
1165         dprintk (1,"vma start=0x%08lx, size=%ld, ret=%d\n",
1166                 (unsigned long)vma->vm_start,
1167                 (unsigned long)vma->vm_end-(unsigned long)vma->vm_start,
1168                 ret);
1169
1170         return ret;
1171 }
1172
1173 static const struct file_operations vivi_fops = {
1174         .owner          = THIS_MODULE,
1175         .open           = vivi_open,
1176         .release        = vivi_release,
1177         .read           = vivi_read,
1178         .poll           = vivi_poll,
1179         .ioctl          = video_ioctl2, /* V4L2 ioctl handler */
1180         .mmap           = vivi_mmap,
1181         .llseek         = no_llseek,
1182 };
1183
1184 static struct video_device vivi = {
1185         .name           = "vivi",
1186         .type           = VID_TYPE_CAPTURE,
1187         .hardware       = 0,
1188         .fops           = &vivi_fops,
1189         .minor          = -1,
1190 //      .release        = video_device_release,
1191
1192         .vidioc_querycap      = vidioc_querycap,
1193         .vidioc_enum_fmt_cap  = vidioc_enum_fmt_cap,
1194         .vidioc_g_fmt_cap     = vidioc_g_fmt_cap,
1195         .vidioc_try_fmt_cap   = vidioc_try_fmt_cap,
1196         .vidioc_s_fmt_cap     = vidioc_s_fmt_cap,
1197         .vidioc_reqbufs       = vidioc_reqbufs,
1198         .vidioc_querybuf      = vidioc_querybuf,
1199         .vidioc_qbuf          = vidioc_qbuf,
1200         .vidioc_dqbuf         = vidioc_dqbuf,
1201         .vidioc_s_std         = vidioc_s_std,
1202         .vidioc_enum_input    = vidioc_enum_input,
1203         .vidioc_g_input       = vidioc_g_input,
1204         .vidioc_s_input       = vidioc_s_input,
1205         .vidioc_queryctrl     = vidioc_queryctrl,
1206         .vidioc_g_ctrl        = vidioc_g_ctrl,
1207         .vidioc_s_ctrl        = vidioc_s_ctrl,
1208         .vidioc_streamon      = vidioc_streamon,
1209         .vidioc_streamoff     = vidioc_streamoff,
1210 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1211         .vidiocgmbuf          = vidiocgmbuf,
1212 #endif
1213         .tvnorms              = V4L2_STD_NTSC_M,
1214         .current_norm         = V4L2_STD_NTSC_M,
1215 };
1216 /* -----------------------------------------------------------------
1217         Initialization and module stuff
1218    ------------------------------------------------------------------*/
1219
1220 static int __init vivi_init(void)
1221 {
1222         int ret;
1223         struct vivi_dev *dev;
1224
1225         dev = kzalloc(sizeof(*dev),GFP_KERNEL);
1226         if (NULL == dev)
1227                 return -ENOMEM;
1228         list_add_tail(&dev->vivi_devlist,&vivi_devlist);
1229
1230         /* init video dma queues */
1231         INIT_LIST_HEAD(&dev->vidq.active);
1232         INIT_LIST_HEAD(&dev->vidq.queued);
1233         init_waitqueue_head(&dev->vidq.wq);
1234
1235         /* initialize locks */
1236         mutex_init(&dev->lock);
1237
1238         dev->vidq.timeout.function = vivi_vid_timeout;
1239         dev->vidq.timeout.data     = (unsigned long)dev;
1240         init_timer(&dev->vidq.timeout);
1241
1242         ret = video_register_device(&vivi, VFL_TYPE_GRABBER, video_nr);
1243         printk(KERN_INFO "Video Technology Magazine Virtual Video Capture Board (Load status: %d)\n", ret);
1244         return ret;
1245 }
1246
1247 static void __exit vivi_exit(void)
1248 {
1249         struct vivi_dev *h;
1250         struct list_head *list;
1251
1252         while (!list_empty(&vivi_devlist)) {
1253                 list = vivi_devlist.next;
1254                 list_del(list);
1255                 h = list_entry(list, struct vivi_dev, vivi_devlist);
1256                 kfree (h);
1257         }
1258         video_unregister_device(&vivi);
1259 }
1260
1261 module_init(vivi_init);
1262 module_exit(vivi_exit);
1263
1264 MODULE_DESCRIPTION("Video Technology Magazine Virtual Video Capture Board");
1265 MODULE_AUTHOR("Mauro Carvalho Chehab, Ted Walther and John Sokol");
1266 MODULE_LICENSE("Dual BSD/GPL");
1267
1268 module_param(video_nr, int, 0);
1269
1270 module_param_named(debug,vivi.debug, int, 0644);
1271 MODULE_PARM_DESC(debug,"activates debug info");
1272
1273 module_param(vid_limit,int,0644);
1274 MODULE_PARM_DESC(vid_limit,"capture memory limit in megabytes");
1275