git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/vivi.c

   1 /*
   2  * Virtual Video driver - This code emulates a real video device with v4l2 api
   3  *
   4  * Copyright (c) 2006 by:
   5  *      Mauro Carvalho Chehab <mchehab--a.t--infradead.org>
   6  *      Ted Walther <ted--a.t--enumera.com>
   7  *      John Sokol <sokol--a.t--videotechnology.com>
   8  *      http://v4l.videotechnology.com/
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the BSD Licence, GNU General Public License
  12  * as published by the Free Software Foundation; either version 2 of the
  13  * License, or (at your option) any later version
  14  */
  15 #include <linux/module.h>
  16 #include <linux/delay.h>
  17 #include <linux/errno.h>
  18 #include <linux/fs.h>
  19 #include <linux/kernel.h>
  20 #include <linux/slab.h>
  21 #include <linux/mm.h>
  22 #include <linux/ioport.h>
  23 #include <linux/init.h>
  24 #include <linux/sched.h>
  25 #include <linux/pci.h>
  26 #include <linux/random.h>
  27 #include <linux/version.h>
  28 #include <linux/mutex.h>
  29 #include <linux/videodev2.h>
  30 #include <linux/dma-mapping.h>
  31 #ifdef CONFIG_VIDEO_V4L1_COMPAT
  32 /* Include V4L1 specific functions. Should be removed soon */
  33 #include <linux/videodev.h>
  34 #endif
  35 #include <linux/interrupt.h>
  36 #include <media/videobuf-vmalloc.h>
  37 #include <media/v4l2-common.h>
  38 #include <media/v4l2-ioctl.h>
  39 #include <linux/kthread.h>
  40 #include <linux/highmem.h>
  41 #include <linux/freezer.h>
  42
  43 #define VIVI_MODULE_NAME "vivi"
  44
  45 /* Wake up at about 30 fps */
  46 #define WAKE_NUMERATOR 30
  47 #define WAKE_DENOMINATOR 1001
  48 #define BUFFER_TIMEOUT     msecs_to_jiffies(500)  /* 0.5 seconds */
  49
  50 #include "font.h"
  51
  52 #define VIVI_MAJOR_VERSION 0
  53 #define VIVI_MINOR_VERSION 5
  54 #define VIVI_RELEASE 0
  55 #define VIVI_VERSION \
  56         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 int video_nr = -1;               /* /dev/videoN, -1 for autodetect */
  61 static int n_devs = 1;                  /* Number of virtual devices */
  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(dev, level, fmt, arg...)                                \
 116         do {                                                            \
 117                 if (dev->vfd->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
 153         /* thread for generating video stream*/
 154         struct task_struct         *kthread;
 155         wait_queue_head_t          wq;
 156         /* Counters to control fps rate */
 157         int                        frame;
 158         int                        ini_jiffies;
 159 };
 160
 161 static LIST_HEAD(vivi_devlist);
 162
 163 struct vivi_dev {
 164         struct list_head           vivi_devlist;
 165
 166         spinlock_t                 slock;
 167         struct mutex               mutex;
 168
 169         int                        users;
 170
 171         /* various device info */
 172         struct video_device        *vfd;
 173
 174         struct vivi_dmaqueue       vidq;
 175
 176         /* Several counters */
 177         int                        h, m, s, ms;
 178         unsigned long              jiffies;
 179         char                       timestr[13];
 180
 181         int                        mv_count;    /* Controls bars movement */
 182 };
 183
 184 struct vivi_fh {
 185         struct vivi_dev            *dev;
 186
 187         /* video capture */
 188         struct vivi_fmt            *fmt;
 189         unsigned int               width, height;
 190         struct videobuf_queue      vb_vidq;
 191
 192         enum v4l2_buf_type         type;
 193 };
 194
 195 /* ------------------------------------------------------------------
 196         DMA and thread functions
 197    ------------------------------------------------------------------*/
 198
 199 /* Bars and Colors should match positions */
 200
 201 enum colors {
 202         WHITE,
 203         AMBAR,
 204         CYAN,
 205         GREEN,
 206         MAGENTA,
 207         RED,
 208         BLUE,
 209         BLACK,
 210 };
 211
 212 static u8 bars[8][3] = {
 213         /* R   G   B */
 214         {204, 204, 204},  /* white */
 215         {208, 208,   0},  /* ambar */
 216         {  0, 206, 206},  /* cyan */
 217         {  0, 239,   0},  /* green */
 218         {239,   0, 239},  /* magenta */
 219         {205,   0,   0},  /* red */
 220         {  0,   0, 255},  /* blue */
 221         {  0,   0,   0},  /* black */
 222 };
 223
 224 #define TO_Y(r, g, b) \
 225         (((16829 * r + 33039 * g + 6416 * b  + 32768) >> 16) + 16)
 226 /* RGB to  V(Cr) Color transform */
 227 #define TO_V(r, g, b) \
 228         (((28784 * r - 24103 * g - 4681 * b  + 32768) >> 16) + 128)
 229 /* RGB to  U(Cb) Color transform */
 230 #define TO_U(r, g, b) \
 231         (((-9714 * r - 19070 * g + 28784 * b + 32768) >> 16) + 128)
 232
 233 #define TSTAMP_MIN_Y 24
 234 #define TSTAMP_MAX_Y TSTAMP_MIN_Y+15
 235 #define TSTAMP_MIN_X 64
 236
 237 static void gen_line(char *basep, int inipos, int wmax,
 238                 int hmax, int line, int count, char *timestr)
 239 {
 240         int  w, i, j, y;
 241         int pos = inipos;
 242         char *p, *s;
 243         u8   chr, r, g, b, color;
 244
 245         /* We will just duplicate the second pixel at the packet */
 246         wmax /= 2;
 247
 248         /* Generate a standard color bar pattern */
 249         for (w = 0; w < wmax; w++) {
 250                 int colorpos = ((w + count) * 8/(wmax + 1)) % 8;
 251                 r = bars[colorpos][0];
 252                 g = bars[colorpos][1];
 253                 b = bars[colorpos][2];
 254
 255                 for (color = 0; color < 4; color++) {
 256                         p = basep + pos;
 257
 258                         switch (color) {
 259                         case 0:
 260                         case 2:
 261                                 *p = TO_Y(r, g, b);     /* Luma */
 262                                 break;
 263                         case 1:
 264                                 *p = TO_U(r, g, b);     /* Cb */
 265                                 break;
 266                         case 3:
 267                                 *p = TO_V(r, g, b);     /* Cr */
 268                                 break;
 269                         }
 270                         pos++;
 271                 }
 272         }
 273
 274         /* Checks if it is possible to show timestamp */
 275         if (TSTAMP_MAX_Y >= hmax)
 276                 goto end;
 277         if (TSTAMP_MIN_X + strlen(timestr) >= wmax)
 278                 goto end;
 279
 280         /* Print stream time */
 281         if (line >= TSTAMP_MIN_Y && line <= TSTAMP_MAX_Y) {
 282                 j = TSTAMP_MIN_X;
 283                 for (s = timestr; *s; s++) {
 284                         chr = rom8x16_bits[(*s-0x30)*16+line-TSTAMP_MIN_Y];
 285                         for (i = 0; i < 7; i++) {
 286                                 if (chr & 1 << (7 - i)) {
 287                                         /* Font color*/
 288                                         r = 0;
 289                                         g = 198;
 290                                         b = 0;
 291                                 } else {
 292                                         /* Background color */
 293                                         r = bars[BLACK][0];
 294                                         g = bars[BLACK][1];
 295                                         b = bars[BLACK][2];
 296                                 }
 297
 298                                 pos = inipos + j * 2;
 299                                 for (color = 0; color < 4; color++) {
 300                                         p = basep + pos;
 301
 302                                         y = TO_Y(r, g, b);
 303
 304                                         switch (color) {
 305                                         case 0:
 306                                         case 2:
 307                                                 *p = TO_Y(r, g, b); /* Luma */
 308                                                 break;
 309                                         case 1:
 310                                                 *p = TO_U(r, g, b); /* Cb */
 311                                                 break;
 312                                         case 3:
 313                                                 *p = TO_V(r, g, b); /* Cr */
 314                                                 break;
 315                                         }
 316                                         pos++;
 317                                 }
 318                                 j++;
 319                         }
 320                 }
 321         }
 322
 323 end:
 324         return;
 325 }
 326
 327 static void vivi_fillbuff(struct vivi_dev *dev, struct vivi_buffer *buf)
 328 {
 329         int h , pos = 0;
 330         int hmax  = buf->vb.height;
 331         int wmax  = buf->vb.width;
 332         struct timeval ts;
 333         char *tmpbuf;
 334         void *vbuf = videobuf_to_vmalloc(&buf->vb);
 335
 336         if (!vbuf)
 337                 return;
 338
 339         tmpbuf = kmalloc(wmax * 2, GFP_ATOMIC);
 340         if (!tmpbuf)
 341                 return;
 342
 343         for (h = 0; h < hmax; h++) {
 344                 gen_line(tmpbuf, 0, wmax, hmax, h, dev->mv_count,
 345                          dev->timestr);
 346                 memcpy(vbuf + pos, tmpbuf, wmax * 2);
 347                 pos += wmax*2;
 348         }
 349
 350         dev->mv_count++;
 351
 352         kfree(tmpbuf);
 353
 354         /* Updates stream time */
 355
 356         dev->ms += jiffies_to_msecs(jiffies-dev->jiffies);
 357         dev->jiffies = jiffies;
 358         if (dev->ms >= 1000) {
 359                 dev->ms -= 1000;
 360                 dev->s++;
 361                 if (dev->s >= 60) {
 362                         dev->s -= 60;
 363                         dev->m++;
 364                         if (dev->m > 60) {
 365                                 dev->m -= 60;
 366                                 dev->h++;
 367                                 if (dev->h > 24)
 368                                         dev->h -= 24;
 369                         }
 370                 }
 371         }
 372         sprintf(dev->timestr, "%02d:%02d:%02d:%03d",
 373                         dev->h, dev->m, dev->s, dev->ms);
 374
 375         dprintk(dev, 2, "vivifill at %s: Buffer 0x%08lx size= %d\n",
 376                         dev->timestr, (unsigned long)tmpbuf, pos);
 377
 378         /* Advice that buffer was filled */
 379         buf->vb.field_count++;
 380         do_gettimeofday(&ts);
 381         buf->vb.ts = ts;
 382         buf->vb.state = VIDEOBUF_DONE;
 383 }
 384
 385 static void vivi_thread_tick(struct vivi_fh *fh)
 386 {
 387         struct vivi_buffer *buf;
 388         struct vivi_dev *dev = fh->dev;
 389         struct vivi_dmaqueue *dma_q = &dev->vidq;
 390
 391         unsigned long flags = 0;
 392
 393         dprintk(dev, 1, "Thread tick\n");
 394
 395         spin_lock_irqsave(&dev->slock, flags);
 396         if (list_empty(&dma_q->active)) {
 397                 dprintk(dev, 1, "No active queue to serve\n");
 398                 goto unlock;
 399         }
 400
 401         buf = list_entry(dma_q->active.next,
 402                          struct vivi_buffer, vb.queue);
 403
 404         /* Nobody is waiting on this buffer, return */
 405         if (!waitqueue_active(&buf->vb.done))
 406                 goto unlock;
 407
 408         list_del(&buf->vb.queue);
 409
 410         do_gettimeofday(&buf->vb.ts);
 411
 412         /* Fill buffer */
 413         vivi_fillbuff(dev, buf);
 414         dprintk(dev, 1, "filled buffer %p\n", buf);
 415
 416         wake_up(&buf->vb.done);
 417         dprintk(dev, 2, "[%p/%d] wakeup\n", buf, buf->vb. i);
 418 unlock:
 419         spin_unlock_irqrestore(&dev->slock, flags);
 420         return;
 421 }
 422
 423 #define frames_to_ms(frames)                                    \
 424         ((frames * WAKE_NUMERATOR * 1000) / WAKE_DENOMINATOR)
 425
 426 static void vivi_sleep(struct vivi_fh *fh)
 427 {
 428         struct vivi_dev *dev = fh->dev;
 429         struct vivi_dmaqueue *dma_q = &dev->vidq;
 430         int timeout;
 431         DECLARE_WAITQUEUE(wait, current);
 432
 433         dprintk(dev, 1, "%s dma_q=0x%08lx\n", __func__,
 434                 (unsigned long)dma_q);
 435
 436         add_wait_queue(&dma_q->wq, &wait);
 437         if (kthread_should_stop())
 438                 goto stop_task;
 439
 440         /* Calculate time to wake up */
 441         timeout = msecs_to_jiffies(frames_to_ms(1));
 442
 443         vivi_thread_tick(fh);
 444
 445         schedule_timeout_interruptible(timeout);
 446
 447 stop_task:
 448         remove_wait_queue(&dma_q->wq, &wait);
 449         try_to_freeze();
 450 }
 451
 452 static int vivi_thread(void *data)
 453 {
 454         struct vivi_fh  *fh = data;
 455         struct vivi_dev *dev = fh->dev;
 456
 457         dprintk(dev, 1, "thread started\n");
 458
 459         set_freezable();
 460
 461         for (;;) {
 462                 vivi_sleep(fh);
 463
 464                 if (kthread_should_stop())
 465                         break;
 466         }
 467         dprintk(dev, 1, "thread: exit\n");
 468         return 0;
 469 }
 470
 471 static int vivi_start_thread(struct vivi_fh *fh)
 472 {
 473         struct vivi_dev *dev = fh->dev;
 474         struct vivi_dmaqueue *dma_q = &dev->vidq;
 475
 476         dma_q->frame = 0;
 477         dma_q->ini_jiffies = jiffies;
 478
 479         dprintk(dev, 1, "%s\n", __func__);
 480
 481         dma_q->kthread = kthread_run(vivi_thread, fh, "vivi");
 482
 483         if (IS_ERR(dma_q->kthread)) {
 484                 printk(KERN_ERR "vivi: kernel_thread() failed\n");
 485                 return PTR_ERR(dma_q->kthread);
 486         }
 487         /* Wakes thread */
 488         wake_up_interruptible(&dma_q->wq);
 489
 490         dprintk(dev, 1, "returning from %s\n", __func__);
 491         return 0;
 492 }
 493
 494 static void vivi_stop_thread(struct vivi_dmaqueue  *dma_q)
 495 {
 496         struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
 497
 498         dprintk(dev, 1, "%s\n", __func__);
 499         /* shutdown control thread */
 500         if (dma_q->kthread) {
 501                 kthread_stop(dma_q->kthread);
 502                 dma_q->kthread = NULL;
 503         }
 504 }
 505
 506 /* ------------------------------------------------------------------
 507         Videobuf operations
 508    ------------------------------------------------------------------*/
 509 static int
 510 buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
 511 {
 512         struct vivi_fh  *fh = vq->priv_data;
 513         struct vivi_dev *dev  = fh->dev;
 514
 515         *size = fh->width*fh->height*2;
 516
 517         if (0 == *count)
 518                 *count = 32;
 519
 520         while (*size * *count > vid_limit * 1024 * 1024)
 521                 (*count)--;
 522
 523         dprintk(dev, 1, "%s, count=%d, size=%d\n", __func__,
 524                 *count, *size);
 525
 526         return 0;
 527 }
 528
 529 static void free_buffer(struct videobuf_queue *vq, struct vivi_buffer *buf)
 530 {
 531         struct vivi_fh  *fh = vq->priv_data;
 532         struct vivi_dev *dev  = fh->dev;
 533
 534         dprintk(dev, 1, "%s, state: %i\n", __func__, buf->vb.state);
 535
 536         if (in_interrupt())
 537                 BUG();
 538
 539         videobuf_vmalloc_free(&buf->vb);
 540         dprintk(dev, 1, "free_buffer: freed\n");
 541         buf->vb.state = VIDEOBUF_NEEDS_INIT;
 542 }
 543
 544 #define norm_maxw() 1024
 545 #define norm_maxh() 768
 546 static int
 547 buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
 548                                                 enum v4l2_field field)
 549 {
 550         struct vivi_fh     *fh  = vq->priv_data;
 551         struct vivi_dev    *dev = fh->dev;
 552         struct vivi_buffer *buf = container_of(vb, struct vivi_buffer, vb);
 553         int rc;
 554
 555         dprintk(dev, 1, "%s, field=%d\n", __func__, field);
 556
 557         BUG_ON(NULL == fh->fmt);
 558
 559         if (fh->width  < 48 || fh->width  > norm_maxw() ||
 560             fh->height < 32 || fh->height > norm_maxh())
 561                 return -EINVAL;
 562
 563         buf->vb.size = fh->width*fh->height*2;
 564         if (0 != buf->vb.baddr  &&  buf->vb.bsize < buf->vb.size)
 565                 return -EINVAL;
 566
 567         /* These properties only change when queue is idle, see s_fmt */
 568         buf->fmt       = fh->fmt;
 569         buf->vb.width  = fh->width;
 570         buf->vb.height = fh->height;
 571         buf->vb.field  = field;
 572
 573         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
 574                 rc = videobuf_iolock(vq, &buf->vb, NULL);
 575                 if (rc < 0)
 576                         goto fail;
 577         }
 578
 579         buf->vb.state = VIDEOBUF_PREPARED;
 580
 581         return 0;
 582
 583 fail:
 584         free_buffer(vq, buf);
 585         return rc;
 586 }
 587
 588 static void
 589 buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 590 {
 591         struct vivi_buffer    *buf  = container_of(vb, struct vivi_buffer, vb);
 592         struct vivi_fh        *fh   = vq->priv_data;
 593         struct vivi_dev       *dev  = fh->dev;
 594         struct vivi_dmaqueue *vidq = &dev->vidq;
 595
 596         dprintk(dev, 1, "%s\n", __func__);
 597
 598         buf->vb.state = VIDEOBUF_QUEUED;
 599         list_add_tail(&buf->vb.queue, &vidq->active);
 600 }
 601
 602 static void buffer_release(struct videobuf_queue *vq,
 603                            struct videobuf_buffer *vb)
 604 {
 605         struct vivi_buffer   *buf  = container_of(vb, struct vivi_buffer, vb);
 606         struct vivi_fh       *fh   = vq->priv_data;
 607         struct vivi_dev      *dev  = (struct vivi_dev *)fh->dev;
 608
 609         dprintk(dev, 1, "%s\n", __func__);
 610
 611         free_buffer(vq, buf);
 612 }
 613
 614 static struct videobuf_queue_ops vivi_video_qops = {
 615         .buf_setup      = buffer_setup,
 616         .buf_prepare    = buffer_prepare,
 617         .buf_queue      = buffer_queue,
 618         .buf_release    = buffer_release,
 619 };
 620
 621 /* ------------------------------------------------------------------
 622         IOCTL vidioc handling
 623    ------------------------------------------------------------------*/
 624 static int vidioc_querycap(struct file *file, void  *priv,
 625                                         struct v4l2_capability *cap)
 626 {
 627         strcpy(cap->driver, "vivi");
 628         strcpy(cap->card, "vivi");
 629         cap->version = VIVI_VERSION;
 630         cap->capabilities =     V4L2_CAP_VIDEO_CAPTURE |
 631                                 V4L2_CAP_STREAMING     |
 632                                 V4L2_CAP_READWRITE;
 633         return 0;
 634 }
 635
 636 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
 637                                         struct v4l2_fmtdesc *f)
 638 {
 639         if (f->index > 0)
 640                 return -EINVAL;
 641
 642         strlcpy(f->description, format.name, sizeof(f->description));
 643         f->pixelformat = format.fourcc;
 644         return 0;
 645 }
 646
 647 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 648                                         struct v4l2_format *f)
 649 {
 650         struct vivi_fh *fh = priv;
 651
 652         f->fmt.pix.width        = fh->width;
 653         f->fmt.pix.height       = fh->height;
 654         f->fmt.pix.field        = fh->vb_vidq.field;
 655         f->fmt.pix.pixelformat  = fh->fmt->fourcc;
 656         f->fmt.pix.bytesperline =
 657                 (f->fmt.pix.width * fh->fmt->depth) >> 3;
 658         f->fmt.pix.sizeimage =
 659                 f->fmt.pix.height * f->fmt.pix.bytesperline;
 660
 661         return (0);
 662 }
 663
 664 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
 665                         struct v4l2_format *f)
 666 {
 667         struct vivi_fh  *fh  = priv;
 668         struct vivi_dev *dev = fh->dev;
 669         struct vivi_fmt *fmt;
 670         enum v4l2_field field;
 671         unsigned int maxw, maxh;
 672
 673         if (format.fourcc != f->fmt.pix.pixelformat) {
 674                 dprintk(dev, 1, "Fourcc format (0x%08x) invalid. "
 675                         "Driver accepts only 0x%08x\n",
 676                         f->fmt.pix.pixelformat, format.fourcc);
 677                 return -EINVAL;
 678         }
 679         fmt = &format;
 680
 681         field = f->fmt.pix.field;
 682
 683         if (field == V4L2_FIELD_ANY) {
 684                 field = V4L2_FIELD_INTERLACED;
 685         } else if (V4L2_FIELD_INTERLACED != field) {
 686                 dprintk(dev, 1, "Field type invalid.\n");
 687                 return -EINVAL;
 688         }
 689
 690         maxw  = norm_maxw();
 691         maxh  = norm_maxh();
 692
 693         f->fmt.pix.field = field;
 694         if (f->fmt.pix.height < 32)
 695                 f->fmt.pix.height = 32;
 696         if (f->fmt.pix.height > maxh)
 697                 f->fmt.pix.height = maxh;
 698         if (f->fmt.pix.width < 48)
 699                 f->fmt.pix.width = 48;
 700         if (f->fmt.pix.width > maxw)
 701                 f->fmt.pix.width = maxw;
 702         f->fmt.pix.width &= ~0x03;
 703         f->fmt.pix.bytesperline =
 704                 (f->fmt.pix.width * fmt->depth) >> 3;
 705         f->fmt.pix.sizeimage =
 706                 f->fmt.pix.height * f->fmt.pix.bytesperline;
 707
 708         return 0;
 709 }
 710
 711 /*FIXME: This seems to be generic enough to be at videodev2 */
 712 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 713                                         struct v4l2_format *f)
 714 {
 715         struct vivi_fh  *fh = priv;
 716         struct videobuf_queue *q = &fh->vb_vidq;
 717
 718         int ret = vidioc_try_fmt_vid_cap(file, fh, f);
 719         if (ret < 0)
 720                 return (ret);
 721
 722         mutex_lock(&q->vb_lock);
 723
 724         if (videobuf_queue_is_busy(&fh->vb_vidq)) {
 725                 dprintk(fh->dev, 1, "%s queue busy\n", __func__);
 726                 ret = -EBUSY;
 727                 goto out;
 728         }
 729
 730         fh->fmt           = &format;
 731         fh->width         = f->fmt.pix.width;
 732         fh->height        = f->fmt.pix.height;
 733         fh->vb_vidq.field = f->fmt.pix.field;
 734         fh->type          = f->type;
 735
 736         ret = 0;
 737 out:
 738         mutex_unlock(&q->vb_lock);
 739
 740         return (ret);
 741 }
 742
 743 static int vidioc_reqbufs(struct file *file, void *priv,
 744                           struct v4l2_requestbuffers *p)
 745 {
 746         struct vivi_fh  *fh = priv;
 747
 748         return (videobuf_reqbufs(&fh->vb_vidq, p));
 749 }
 750
 751 static int vidioc_querybuf(struct file *file, void *priv, struct v4l2_buffer *p)
 752 {
 753         struct vivi_fh  *fh = priv;
 754
 755         return (videobuf_querybuf(&fh->vb_vidq, p));
 756 }
 757
 758 static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)
 759 {
 760         struct vivi_fh *fh = priv;
 761
 762         return (videobuf_qbuf(&fh->vb_vidq, p));
 763 }
 764
 765 static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
 766 {
 767         struct vivi_fh  *fh = priv;
 768
 769         return (videobuf_dqbuf(&fh->vb_vidq, p,
 770                                 file->f_flags & O_NONBLOCK));
 771 }
 772
 773 #ifdef CONFIG_VIDEO_V4L1_COMPAT
 774 static int vidiocgmbuf(struct file *file, void *priv, struct video_mbuf *mbuf)
 775 {
 776         struct vivi_fh  *fh = priv;
 777
 778         return videobuf_cgmbuf(&fh->vb_vidq, mbuf, 8);
 779 }
 780 #endif
 781
 782 static int vidioc_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
 783 {
 784         struct vivi_fh  *fh = priv;
 785
 786         if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 787                 return -EINVAL;
 788         if (i != fh->type)
 789                 return -EINVAL;
 790
 791         return videobuf_streamon(&fh->vb_vidq);
 792 }
 793
 794 static int vidioc_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
 795 {
 796         struct vivi_fh  *fh = priv;
 797
 798         if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
 799                 return -EINVAL;
 800         if (i != fh->type)
 801                 return -EINVAL;
 802
 803         return videobuf_streamoff(&fh->vb_vidq);
 804 }
 805
 806 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *i)
 807 {
 808         return 0;
 809 }
 810
 811 /* only one input in this sample driver */
 812 static int vidioc_enum_input(struct file *file, void *priv,
 813                                 struct v4l2_input *inp)
 814 {
 815         if (inp->index != 0)
 816                 return -EINVAL;
 817
 818         inp->type = V4L2_INPUT_TYPE_CAMERA;
 819         inp->std = V4L2_STD_525_60;
 820         strcpy(inp->name, "Camera");
 821
 822         return (0);
 823 }
 824
 825 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
 826 {
 827         *i = 0;
 828
 829         return (0);
 830 }
 831 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
 832 {
 833         if (i > 0)
 834                 return -EINVAL;
 835
 836         return (0);
 837 }
 838
 839         /* --- controls ---------------------------------------------- */
 840 static int vidioc_queryctrl(struct file *file, void *priv,
 841                             struct v4l2_queryctrl *qc)
 842 {
 843         int i;
 844
 845         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
 846                 if (qc->id && qc->id == vivi_qctrl[i].id) {
 847                         memcpy(qc, &(vivi_qctrl[i]),
 848                                 sizeof(*qc));
 849                         return (0);
 850                 }
 851
 852         return -EINVAL;
 853 }
 854
 855 static int vidioc_g_ctrl(struct file *file, void *priv,
 856                          struct v4l2_control *ctrl)
 857 {
 858         int i;
 859
 860         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
 861                 if (ctrl->id == vivi_qctrl[i].id) {
 862                         ctrl->value = qctl_regs[i];
 863                         return (0);
 864                 }
 865
 866         return -EINVAL;
 867 }
 868 static int vidioc_s_ctrl(struct file *file, void *priv,
 869                                 struct v4l2_control *ctrl)
 870 {
 871         int i;
 872
 873         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
 874                 if (ctrl->id == vivi_qctrl[i].id) {
 875                         if (ctrl->value < vivi_qctrl[i].minimum
 876                             || ctrl->value > vivi_qctrl[i].maximum) {
 877                                         return (-ERANGE);
 878                                 }
 879                         qctl_regs[i] = ctrl->value;
 880                         return (0);
 881                 }
 882         return -EINVAL;
 883 }
 884
 885 /* ------------------------------------------------------------------
 886         File operations for the device
 887    ------------------------------------------------------------------*/
 888
 889 #define line_buf_size(norm) (norm_maxw(norm)*(format.depth+7)/8)
 890
 891 static int vivi_open(struct inode *inode, struct file *file)
 892 {
 893         int minor = iminor(inode);
 894         struct vivi_dev *dev;
 895         struct vivi_fh *fh = NULL;
 896         int i;
 897         int retval = 0;
 898
 899         printk(KERN_DEBUG "vivi: open called (minor=%d)\n", minor);
 900
 901         list_for_each_entry(dev, &vivi_devlist, vivi_devlist)
 902                 if (dev->vfd->minor == minor)
 903                         goto found;
 904         return -ENODEV;
 905
 906 found:
 907         mutex_lock(&dev->mutex);
 908         dev->users++;
 909
 910         if (dev->users > 1) {
 911                 dev->users--;
 912                 retval = -EBUSY;
 913                 goto unlock;
 914         }
 915
 916         dprintk(dev, 1, "open minor=%d type=%s users=%d\n", minor,
 917                 v4l2_type_names[V4L2_BUF_TYPE_VIDEO_CAPTURE], dev->users);
 918
 919         /* allocate + initialize per filehandle data */
 920         fh = kzalloc(sizeof(*fh), GFP_KERNEL);
 921         if (NULL == fh) {
 922                 dev->users--;
 923                 retval = -ENOMEM;
 924                 goto unlock;
 925         }
 926 unlock:
 927         mutex_unlock(&dev->mutex);
 928         if (retval)
 929                 return retval;
 930
 931         file->private_data = fh;
 932         fh->dev      = dev;
 933
 934         fh->type     = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 935         fh->fmt      = &format;
 936         fh->width    = 640;
 937         fh->height   = 480;
 938
 939         /* Put all controls at a sane state */
 940         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
 941                 qctl_regs[i] = vivi_qctrl[i].default_value;
 942
 943         /* Resets frame counters */
 944         dev->h = 0;
 945         dev->m = 0;
 946         dev->s = 0;
 947         dev->ms = 0;
 948         dev->mv_count = 0;
 949         dev->jiffies = jiffies;
 950         sprintf(dev->timestr, "%02d:%02d:%02d:%03d",
 951                         dev->h, dev->m, dev->s, dev->ms);
 952
 953         videobuf_queue_vmalloc_init(&fh->vb_vidq, &vivi_video_qops,
 954                         NULL, &dev->slock, fh->type, V4L2_FIELD_INTERLACED,
 955                         sizeof(struct vivi_buffer), fh);
 956
 957         vivi_start_thread(fh);
 958
 959         return 0;
 960 }
 961
 962 static ssize_t
 963 vivi_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
 964 {
 965         struct vivi_fh *fh = file->private_data;
 966
 967         if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 968                 return videobuf_read_stream(&fh->vb_vidq, data, count, ppos, 0,
 969                                         file->f_flags & O_NONBLOCK);
 970         }
 971         return 0;
 972 }
 973
 974 static unsigned int
 975 vivi_poll(struct file *file, struct poll_table_struct *wait)
 976 {
 977         struct vivi_fh        *fh = file->private_data;
 978         struct vivi_dev       *dev = fh->dev;
 979         struct videobuf_queue *q = &fh->vb_vidq;
 980
 981         dprintk(dev, 1, "%s\n", __func__);
 982
 983         if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
 984                 return POLLERR;
 985
 986         return videobuf_poll_stream(file, q, wait);
 987 }
 988
 989 static int vivi_close(struct inode *inode, struct file *file)
 990 {
 991         struct vivi_fh         *fh = file->private_data;
 992         struct vivi_dev *dev       = fh->dev;
 993         struct vivi_dmaqueue *vidq = &dev->vidq;
 994
 995         int minor = iminor(inode);
 996
 997         vivi_stop_thread(vidq);
 998         videobuf_stop(&fh->vb_vidq);
 999         videobuf_mmap_free(&fh->vb_vidq);
1000
1001         kfree(fh);
1002
1003         mutex_lock(&dev->mutex);
1004         dev->users--;
1005         mutex_unlock(&dev->mutex);
1006
1007         dprintk(dev, 1, "close called (minor=%d, users=%d)\n",
1008                 minor, dev->users);
1009
1010         return 0;
1011 }
1012
1013 static int vivi_release(void)
1014 {
1015         struct vivi_dev *dev;
1016         struct list_head *list;
1017
1018         while (!list_empty(&vivi_devlist)) {
1019                 list = vivi_devlist.next;
1020                 list_del(list);
1021                 dev = list_entry(list, struct vivi_dev, vivi_devlist);
1022
1023                 if (-1 != dev->vfd->minor) {
1024                         video_unregister_device(dev->vfd);
1025                         printk(KERN_INFO "%s: /dev/video%d unregistered.\n",
1026                                 VIVI_MODULE_NAME, dev->vfd->minor);
1027                 } else {
1028                         video_device_release(dev->vfd);
1029                         printk(KERN_INFO "%s: /dev/video%d released.\n",
1030                                 VIVI_MODULE_NAME, dev->vfd->minor);
1031                 }
1032
1033                 kfree(dev);
1034         }
1035
1036         return 0;
1037 }
1038
1039 static int vivi_mmap(struct file *file, struct vm_area_struct *vma)
1040 {
1041         struct vivi_fh  *fh = file->private_data;
1042         struct vivi_dev *dev = fh->dev;
1043         int ret;
1044
1045         dprintk(dev, 1, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
1046
1047         ret = videobuf_mmap_mapper(&fh->vb_vidq, vma);
1048
1049         dprintk(dev, 1, "vma start=0x%08lx, size=%ld, ret=%d\n",
1050                 (unsigned long)vma->vm_start,
1051                 (unsigned long)vma->vm_end-(unsigned long)vma->vm_start,
1052                 ret);
1053
1054         return ret;
1055 }
1056
1057 static const struct file_operations vivi_fops = {
1058         .owner          = THIS_MODULE,
1059         .open           = vivi_open,
1060         .release        = vivi_close,
1061         .read           = vivi_read,
1062         .poll           = vivi_poll,
1063         .ioctl          = video_ioctl2, /* V4L2 ioctl handler */
1064         .compat_ioctl   = v4l_compat_ioctl32,
1065         .mmap           = vivi_mmap,
1066         .llseek         = no_llseek,
1067 };
1068
1069 static const struct v4l2_ioctl_ops vivi_ioctl_ops = {
1070         .vidioc_querycap      = vidioc_querycap,
1071         .vidioc_enum_fmt_vid_cap  = vidioc_enum_fmt_vid_cap,
1072         .vidioc_g_fmt_vid_cap     = vidioc_g_fmt_vid_cap,
1073         .vidioc_try_fmt_vid_cap   = vidioc_try_fmt_vid_cap,
1074         .vidioc_s_fmt_vid_cap     = vidioc_s_fmt_vid_cap,
1075         .vidioc_reqbufs       = vidioc_reqbufs,
1076         .vidioc_querybuf      = vidioc_querybuf,
1077         .vidioc_qbuf          = vidioc_qbuf,
1078         .vidioc_dqbuf         = vidioc_dqbuf,
1079         .vidioc_s_std         = vidioc_s_std,
1080         .vidioc_enum_input    = vidioc_enum_input,
1081         .vidioc_g_input       = vidioc_g_input,
1082         .vidioc_s_input       = vidioc_s_input,
1083         .vidioc_queryctrl     = vidioc_queryctrl,
1084         .vidioc_g_ctrl        = vidioc_g_ctrl,
1085         .vidioc_s_ctrl        = vidioc_s_ctrl,
1086         .vidioc_streamon      = vidioc_streamon,
1087         .vidioc_streamoff     = vidioc_streamoff,
1088 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1089         .vidiocgmbuf          = vidiocgmbuf,
1090 #endif
1091 };
1092
1093 static struct video_device vivi_template = {
1094         .name           = "vivi",
1095         .fops           = &vivi_fops,
1096         .ioctl_ops      = &vivi_ioctl_ops,
1097         .minor          = -1,
1098         .release        = video_device_release,
1099
1100         .tvnorms              = V4L2_STD_525_60,
1101         .current_norm         = V4L2_STD_NTSC_M,
1102 };
1103 /* -----------------------------------------------------------------
1104         Initialization and module stuff
1105    ------------------------------------------------------------------*/
1106
1107 static int __init vivi_init(void)
1108 {
1109         int ret = -ENOMEM, i;
1110         struct vivi_dev *dev;
1111         struct video_device *vfd;
1112
1113         for (i = 0; i < n_devs; i++) {
1114                 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1115                 if (NULL == dev)
1116                         break;
1117
1118                 list_add_tail(&dev->vivi_devlist, &vivi_devlist);
1119
1120                 /* init video dma queues */
1121                 INIT_LIST_HEAD(&dev->vidq.active);
1122                 init_waitqueue_head(&dev->vidq.wq);
1123
1124                 /* initialize locks */
1125                 spin_lock_init(&dev->slock);
1126                 mutex_init(&dev->mutex);
1127
1128                 vfd = video_device_alloc();
1129                 if (NULL == vfd)
1130                         break;
1131
1132                 *vfd = vivi_template;
1133
1134                 ret = video_register_device(vfd, VFL_TYPE_GRABBER, video_nr);
1135                 if (ret < 0)
1136                         break;
1137
1138                 snprintf(vfd->name, sizeof(vfd->name), "%s (%i)",
1139                          vivi_template.name, vfd->minor);
1140
1141                 if (video_nr >= 0)
1142                         video_nr++;
1143
1144                 dev->vfd = vfd;
1145                 printk(KERN_INFO "%s: V4L2 device registered as /dev/video%d\n",
1146                         VIVI_MODULE_NAME, vfd->minor);
1147         }
1148
1149         if (ret < 0) {
1150                 vivi_release();
1151                 printk(KERN_INFO "Error %d while loading vivi driver\n", ret);
1152         } else
1153                 printk(KERN_INFO "Video Technology Magazine Virtual Video "
1154                         "Capture Board ver %u.%u.%u successfully loaded.\n",
1155                         (VIVI_VERSION >> 16) & 0xFF, (VIVI_VERSION >> 8) & 0xFF,
1156                         VIVI_VERSION & 0xFF);
1157         return ret;
1158 }
1159
1160 static void __exit vivi_exit(void)
1161 {
1162         vivi_release();
1163 }
1164
1165 module_init(vivi_init);
1166 module_exit(vivi_exit);
1167
1168 MODULE_DESCRIPTION("Video Technology Magazine Virtual Video Capture Board");
1169 MODULE_AUTHOR("Mauro Carvalho Chehab, Ted Walther and John Sokol");
1170 MODULE_LICENSE("Dual BSD/GPL");
1171
1172 module_param(video_nr, int, 0);
1173 MODULE_PARM_DESC(video_nr, "video iminor start number");
1174
1175 module_param(n_devs, int, 0);
1176 MODULE_PARM_DESC(n_devs, "number of video devices to create");
1177
1178 module_param_named(debug, vivi_template.debug, int, 0444);
1179 MODULE_PARM_DESC(debug, "activates debug info");
1180
1181 module_param(vid_limit, int, 0644);
1182 MODULE_PARM_DESC(vid_limit, "capture memory limit in megabytes");