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