Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6] / drivers / media / video / vivi.c
1 /*
2  * Virtual Video driver - This code emulates a real video device with v4l2 api
3  *
4  * Copyright (c) 2006 by:
5  *      Mauro Carvalho Chehab <mchehab--a.t--infradead.org>
6  *      Ted Walther <ted--a.t--enumera.com>
7  *      John Sokol <sokol--a.t--videotechnology.com>
8  *      http://v4l.videotechnology.com/
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the BSD Licence, GNU General Public License
12  * as published by the Free Software Foundation; either version 2 of the
13  * License, or (at your option) any later version
14  */
15 #include <linux/module.h>
16 #include <linux/delay.h>
17 #include <linux/errno.h>
18 #include <linux/fs.h>
19 #include <linux/kernel.h>
20 #include <linux/slab.h>
21 #include <linux/mm.h>
22 #include <linux/ioport.h>
23 #include <linux/init.h>
24 #include <linux/sched.h>
25 #include <linux/pci.h>
26 #include <linux/random.h>
27 #include <linux/version.h>
28 #include <linux/mutex.h>
29 #include <linux/videodev2.h>
30 #include <linux/dma-mapping.h>
31 #ifdef CONFIG_VIDEO_V4L1_COMPAT
32 /* Include V4L1 specific functions. Should be removed soon */
33 #include <linux/videodev.h>
34 #endif
35 #include <linux/interrupt.h>
36 #include <media/videobuf-vmalloc.h>
37 #include <media/v4l2-common.h>
38 #include <linux/kthread.h>
39 #include <linux/highmem.h>
40 #include <linux/freezer.h>
41
42 /* Wake up at about 30 fps */
43 #define WAKE_NUMERATOR 30
44 #define WAKE_DENOMINATOR 1001
45 #define BUFFER_TIMEOUT     msecs_to_jiffies(500)  /* 0.5 seconds */
46
47 #include "font.h"
48
49 #define VIVI_MAJOR_VERSION 0
50 #define VIVI_MINOR_VERSION 4
51 #define VIVI_RELEASE 0
52 #define VIVI_VERSION \
53         KERNEL_VERSION(VIVI_MAJOR_VERSION, VIVI_MINOR_VERSION, VIVI_RELEASE)
54
55 /* Declare static vars that will be used as parameters */
56 static unsigned int vid_limit = 16;     /* Video memory limit, in Mb */
57 static int video_nr = -1;               /* /dev/videoN, -1 for autodetect */
58 static int n_devs = 1;                  /* Number of virtual devices */
59
60 /* supported controls */
61 static struct v4l2_queryctrl vivi_qctrl[] = {
62         {
63                 .id            = V4L2_CID_AUDIO_VOLUME,
64                 .name          = "Volume",
65                 .minimum       = 0,
66                 .maximum       = 65535,
67                 .step          = 65535/100,
68                 .default_value = 65535,
69                 .flags         = 0,
70                 .type          = V4L2_CTRL_TYPE_INTEGER,
71         }, {
72                 .id            = V4L2_CID_BRIGHTNESS,
73                 .type          = V4L2_CTRL_TYPE_INTEGER,
74                 .name          = "Brightness",
75                 .minimum       = 0,
76                 .maximum       = 255,
77                 .step          = 1,
78                 .default_value = 127,
79                 .flags         = 0,
80         }, {
81                 .id            = V4L2_CID_CONTRAST,
82                 .type          = V4L2_CTRL_TYPE_INTEGER,
83                 .name          = "Contrast",
84                 .minimum       = 0,
85                 .maximum       = 255,
86                 .step          = 0x1,
87                 .default_value = 0x10,
88                 .flags         = 0,
89         }, {
90                 .id            = V4L2_CID_SATURATION,
91                 .type          = V4L2_CTRL_TYPE_INTEGER,
92                 .name          = "Saturation",
93                 .minimum       = 0,
94                 .maximum       = 255,
95                 .step          = 0x1,
96                 .default_value = 127,
97                 .flags         = 0,
98         }, {
99                 .id            = V4L2_CID_HUE,
100                 .type          = V4L2_CTRL_TYPE_INTEGER,
101                 .name          = "Hue",
102                 .minimum       = -128,
103                 .maximum       = 127,
104                 .step          = 0x1,
105                 .default_value = 0,
106                 .flags         = 0,
107         }
108 };
109
110 static int qctl_regs[ARRAY_SIZE(vivi_qctrl)];
111
112 #define dprintk(dev, level, fmt, arg...)                                \
113         do {                                                            \
114                 if (dev->vfd->debug >= (level))                         \
115                         printk(KERN_DEBUG "vivi: " fmt , ## arg);       \
116         } while (0)
117
118 /* ------------------------------------------------------------------
119         Basic structures
120    ------------------------------------------------------------------*/
121
122 struct vivi_fmt {
123         char  *name;
124         u32   fourcc;          /* v4l2 format id */
125         int   depth;
126 };
127
128 static struct vivi_fmt format = {
129         .name     = "4:2:2, packed, YUYV",
130         .fourcc   = V4L2_PIX_FMT_YUYV,
131         .depth    = 16,
132 };
133
134 struct sg_to_addr {
135         int pos;
136         struct scatterlist *sg;
137 };
138
139 /* buffer for one video frame */
140 struct vivi_buffer {
141         /* common v4l buffer stuff -- must be first */
142         struct videobuf_buffer vb;
143
144         struct vivi_fmt        *fmt;
145 };
146
147 struct vivi_dmaqueue {
148         struct list_head       active;
149
150         /* thread for generating video stream*/
151         struct task_struct         *kthread;
152         wait_queue_head_t          wq;
153         /* Counters to control fps rate */
154         int                        frame;
155         int                        ini_jiffies;
156 };
157
158 static LIST_HEAD(vivi_devlist);
159
160 struct vivi_dev {
161         struct list_head           vivi_devlist;
162
163         spinlock_t                 slock;
164         struct mutex               mutex;
165
166         int                        users;
167
168         /* various device info */
169         struct video_device        *vfd;
170
171         struct vivi_dmaqueue       vidq;
172
173         /* Several counters */
174         int                        h, m, s, ms;
175         unsigned long              jiffies;
176         char                       timestr[13];
177
178         int                        mv_count;    /* Controls bars movement */
179 };
180
181 struct vivi_fh {
182         struct vivi_dev            *dev;
183
184         /* video capture */
185         struct vivi_fmt            *fmt;
186         unsigned int               width, height;
187         struct videobuf_queue      vb_vidq;
188
189         enum v4l2_buf_type         type;
190 };
191
192 /* ------------------------------------------------------------------
193         DMA and thread functions
194    ------------------------------------------------------------------*/
195
196 /* Bars and Colors should match positions */
197
198 enum colors {
199         WHITE,
200         AMBAR,
201         CYAN,
202         GREEN,
203         MAGENTA,
204         RED,
205         BLUE,
206         BLACK,
207 };
208
209 static u8 bars[8][3] = {
210         /* R   G   B */
211         {204, 204, 204},  /* white */
212         {208, 208,   0},  /* ambar */
213         {  0, 206, 206},  /* cyan */
214         {  0, 239,   0},  /* green */
215         {239,   0, 239},  /* magenta */
216         {205,   0,   0},  /* red */
217         {  0,   0, 255},  /* blue */
218         {  0,   0,   0},  /* black */
219 };
220
221 #define TO_Y(r, g, b) \
222         (((16829 * r + 33039 * g + 6416 * b  + 32768) >> 16) + 16)
223 /* RGB to  V(Cr) Color transform */
224 #define TO_V(r, g, b) \
225         (((28784 * r - 24103 * g - 4681 * b  + 32768) >> 16) + 128)
226 /* RGB to  U(Cb) Color transform */
227 #define TO_U(r, g, b) \
228         (((-9714 * r - 19070 * g + 28784 * b + 32768) >> 16) + 128)
229
230 #define TSTAMP_MIN_Y 24
231 #define TSTAMP_MAX_Y TSTAMP_MIN_Y+15
232 #define TSTAMP_MIN_X 64
233
234 static void gen_line(char *basep, int inipos, int wmax,
235                 int hmax, int line, int count, char *timestr)
236 {
237         int  w, i, j, y;
238         int pos = inipos;
239         char *p, *s;
240         u8   chr, r, g, b, color;
241
242         /* We will just duplicate the second pixel at the packet */
243         wmax /= 2;
244
245         /* Generate a standard color bar pattern */
246         for (w = 0; w < wmax; w++) {
247                 int colorpos = ((w + count) * 8/(wmax + 1)) % 8;
248                 r = bars[colorpos][0];
249                 g = bars[colorpos][1];
250                 b = bars[colorpos][2];
251
252                 for (color = 0; color < 4; color++) {
253                         p = basep + pos;
254
255                         switch (color) {
256                         case 0:
257                         case 2:
258                                 *p = TO_Y(r, g, b);     /* Luma */
259                                 break;
260                         case 1:
261                                 *p = TO_U(r, g, b);     /* Cb */
262                                 break;
263                         case 3:
264                                 *p = TO_V(r, g, b);     /* Cr */
265                                 break;
266                         }
267                         pos++;
268                 }
269         }
270
271         /* Checks if it is possible to show timestamp */
272         if (TSTAMP_MAX_Y >= hmax)
273                 goto end;
274         if (TSTAMP_MIN_X + strlen(timestr) >= wmax)
275                 goto end;
276
277         /* Print stream time */
278         if (line >= TSTAMP_MIN_Y && line <= TSTAMP_MAX_Y) {
279                 j = TSTAMP_MIN_X;
280                 for (s = timestr; *s; s++) {
281                         chr = rom8x16_bits[(*s-0x30)*16+line-TSTAMP_MIN_Y];
282                         for (i = 0; i < 7; i++) {
283                                 if (chr & 1 << (7 - i)) {
284                                         /* Font color*/
285                                         r = 0;
286                                         g = 198;
287                                         b = 0;
288                                 } else {
289                                         /* Background color */
290                                         r = bars[BLACK][0];
291                                         g = bars[BLACK][1];
292                                         b = bars[BLACK][2];
293                                 }
294
295                                 pos = inipos + j * 2;
296                                 for (color = 0; color < 4; color++) {
297                                         p = basep + pos;
298
299                                         y = TO_Y(r, g, b);
300
301                                         switch (color) {
302                                         case 0:
303                                         case 2:
304                                                 *p = TO_Y(r, g, b); /* Luma */
305                                                 break;
306                                         case 1:
307                                                 *p = TO_U(r, g, b); /* Cb */
308                                                 break;
309                                         case 3:
310                                                 *p = TO_V(r, g, b); /* Cr */
311                                                 break;
312                                         }
313                                         pos++;
314                                 }
315                                 j++;
316                         }
317                 }
318         }
319
320 end:
321         return;
322 }
323
324 static void vivi_fillbuff(struct vivi_dev *dev, struct vivi_buffer *buf)
325 {
326         int h , pos = 0;
327         int hmax  = buf->vb.height;
328         int wmax  = buf->vb.width;
329         struct timeval ts;
330         char *tmpbuf;
331         void *vbuf = videobuf_to_vmalloc(&buf->vb);
332
333         if (!vbuf)
334                 return;
335
336         tmpbuf = kmalloc(wmax * 2, GFP_ATOMIC);
337         if (!tmpbuf)
338                 return;
339
340         for (h = 0; h < hmax; h++) {
341                 gen_line(tmpbuf, 0, wmax, hmax, h, dev->mv_count,
342                          dev->timestr);
343                 memcpy(vbuf + pos, tmpbuf, wmax * 2);
344                 pos += wmax*2;
345         }
346
347         dev->mv_count++;
348
349         kfree(tmpbuf);
350
351         /* Updates stream time */
352
353         dev->ms += jiffies_to_msecs(jiffies-dev->jiffies);
354         dev->jiffies = jiffies;
355         if (dev->ms >= 1000) {
356                 dev->ms -= 1000;
357                 dev->s++;
358                 if (dev->s >= 60) {
359                         dev->s -= 60;
360                         dev->m++;
361                         if (dev->m > 60) {
362                                 dev->m -= 60;
363                                 dev->h++;
364                                 if (dev->h > 24)
365                                         dev->h -= 24;
366                         }
367                 }
368         }
369         sprintf(dev->timestr, "%02d:%02d:%02d:%03d",
370                         dev->h, dev->m, dev->s, dev->ms);
371
372         dprintk(dev, 2, "vivifill at %s: Buffer 0x%08lx size= %d\n",
373                         dev->timestr, (unsigned long)tmpbuf, pos);
374
375         /* Advice that buffer was filled */
376         buf->vb.field_count++;
377         do_gettimeofday(&ts);
378         buf->vb.ts = ts;
379         buf->vb.state = VIDEOBUF_DONE;
380 }
381
382 static void vivi_thread_tick(struct vivi_fh *fh)
383 {
384         struct vivi_buffer *buf;
385         struct vivi_dev *dev = fh->dev;
386         struct vivi_dmaqueue *dma_q = &dev->vidq;
387
388         unsigned long flags = 0;
389
390         dprintk(dev, 1, "Thread tick\n");
391
392         spin_lock_irqsave(&dev->slock, flags);
393         if (list_empty(&dma_q->active)) {
394                 dprintk(dev, 1, "No active queue to serve\n");
395                 goto unlock;
396         }
397
398         buf = list_entry(dma_q->active.next,
399                          struct vivi_buffer, vb.queue);
400
401         /* Nobody is waiting on this buffer, return */
402         if (!waitqueue_active(&buf->vb.done))
403                 goto unlock;
404
405         list_del(&buf->vb.queue);
406
407         do_gettimeofday(&buf->vb.ts);
408
409         /* Fill buffer */
410         vivi_fillbuff(dev, buf);
411         dprintk(dev, 1, "filled buffer %p\n", buf);
412
413         wake_up(&buf->vb.done);
414         dprintk(dev, 2, "[%p/%d] wakeup\n", buf, buf->vb. i);
415 unlock:
416         spin_unlock_irqrestore(&dev->slock, flags);
417         return;
418 }
419
420 #define frames_to_ms(frames)                                    \
421         ((frames * WAKE_NUMERATOR * 1000) / WAKE_DENOMINATOR)
422
423 static void vivi_sleep(struct vivi_fh *fh)
424 {
425         struct vivi_dev *dev = fh->dev;
426         struct vivi_dmaqueue *dma_q = &dev->vidq;
427         int timeout;
428         DECLARE_WAITQUEUE(wait, current);
429
430         dprintk(dev, 1, "%s dma_q=0x%08lx\n", __func__,
431                 (unsigned long)dma_q);
432
433         add_wait_queue(&dma_q->wq, &wait);
434         if (kthread_should_stop())
435                 goto stop_task;
436
437         /* Calculate time to wake up */
438         timeout = msecs_to_jiffies(frames_to_ms(1));
439
440         vivi_thread_tick(fh);
441
442         schedule_timeout_interruptible(timeout);
443
444 stop_task:
445         remove_wait_queue(&dma_q->wq, &wait);
446         try_to_freeze();
447 }
448
449 static int vivi_thread(void *data)
450 {
451         struct vivi_fh  *fh = data;
452         struct vivi_dev *dev = fh->dev;
453
454         dprintk(dev, 1, "thread started\n");
455
456         set_freezable();
457
458         for (;;) {
459                 vivi_sleep(fh);
460
461                 if (kthread_should_stop())
462                         break;
463         }
464         dprintk(dev, 1, "thread: exit\n");
465         return 0;
466 }
467
468 static int vivi_start_thread(struct vivi_fh *fh)
469 {
470         struct vivi_dev *dev = fh->dev;
471         struct vivi_dmaqueue *dma_q = &dev->vidq;
472
473         dma_q->frame = 0;
474         dma_q->ini_jiffies = jiffies;
475
476         dprintk(dev, 1, "%s\n", __func__);
477
478         dma_q->kthread = kthread_run(vivi_thread, fh, "vivi");
479
480         if (IS_ERR(dma_q->kthread)) {
481                 printk(KERN_ERR "vivi: kernel_thread() failed\n");
482                 return PTR_ERR(dma_q->kthread);
483         }
484         /* Wakes thread */
485         wake_up_interruptible(&dma_q->wq);
486
487         dprintk(dev, 1, "returning from %s\n", __func__);
488         return 0;
489 }
490
491 static void vivi_stop_thread(struct vivi_dmaqueue  *dma_q)
492 {
493         struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
494
495         dprintk(dev, 1, "%s\n", __func__);
496         /* shutdown control thread */
497         if (dma_q->kthread) {
498                 kthread_stop(dma_q->kthread);
499                 dma_q->kthread = NULL;
500         }
501 }
502
503 /* ------------------------------------------------------------------
504         Videobuf operations
505    ------------------------------------------------------------------*/
506 static int
507 buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
508 {
509         struct vivi_fh  *fh = vq->priv_data;
510         struct vivi_dev *dev  = fh->dev;
511
512         *size = fh->width*fh->height*2;
513
514         if (0 == *count)
515                 *count = 32;
516
517         while (*size * *count > vid_limit * 1024 * 1024)
518                 (*count)--;
519
520         dprintk(dev, 1, "%s, count=%d, size=%d\n", __func__,
521                 *count, *size);
522
523         return 0;
524 }
525
526 static void free_buffer(struct videobuf_queue *vq, struct vivi_buffer *buf)
527 {
528         struct vivi_fh  *fh = vq->priv_data;
529         struct vivi_dev *dev  = fh->dev;
530
531         dprintk(dev, 1, "%s, state: %i\n", __func__, buf->vb.state);
532
533         if (in_interrupt())
534                 BUG();
535
536         videobuf_vmalloc_free(&buf->vb);
537         dprintk(dev, 1, "free_buffer: freed\n");
538         buf->vb.state = VIDEOBUF_NEEDS_INIT;
539 }
540
541 #define norm_maxw() 1024
542 #define norm_maxh() 768
543 static int
544 buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
545                                                 enum v4l2_field field)
546 {
547         struct vivi_fh     *fh  = vq->priv_data;
548         struct vivi_dev    *dev = fh->dev;
549         struct vivi_buffer *buf = container_of(vb, struct vivi_buffer, vb);
550         int rc;
551
552         dprintk(dev, 1, "%s, field=%d\n", __func__, field);
553
554         BUG_ON(NULL == fh->fmt);
555
556         if (fh->width  < 48 || fh->width  > norm_maxw() ||
557             fh->height < 32 || fh->height > norm_maxh())
558                 return -EINVAL;
559
560         buf->vb.size = fh->width*fh->height*2;
561         if (0 != buf->vb.baddr  &&  buf->vb.bsize < buf->vb.size)
562                 return -EINVAL;
563
564         /* These properties only change when queue is idle, see s_fmt */
565         buf->fmt       = fh->fmt;
566         buf->vb.width  = fh->width;
567         buf->vb.height = fh->height;
568         buf->vb.field  = field;
569
570         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
571                 rc = videobuf_iolock(vq, &buf->vb, NULL);
572                 if (rc < 0)
573                         goto fail;
574         }
575
576         buf->vb.state = VIDEOBUF_PREPARED;
577
578         return 0;
579
580 fail:
581         free_buffer(vq, buf);
582         return rc;
583 }
584
585 static void
586 buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
587 {
588         struct vivi_buffer    *buf  = container_of(vb, struct vivi_buffer, vb);
589         struct vivi_fh        *fh   = vq->priv_data;
590         struct vivi_dev       *dev  = fh->dev;
591         struct vivi_dmaqueue *vidq = &dev->vidq;
592
593         dprintk(dev, 1, "%s\n", __func__);
594
595         buf->vb.state = VIDEOBUF_QUEUED;
596         list_add_tail(&buf->vb.queue, &vidq->active);
597 }
598
599 static void buffer_release(struct videobuf_queue *vq,
600                            struct videobuf_buffer *vb)
601 {
602         struct vivi_buffer   *buf  = container_of(vb, struct vivi_buffer, vb);
603         struct vivi_fh       *fh   = vq->priv_data;
604         struct vivi_dev      *dev  = (struct vivi_dev *)fh->dev;
605
606         dprintk(dev, 1, "%s\n", __func__);
607
608         free_buffer(vq, buf);
609 }
610
611 static struct videobuf_queue_ops vivi_video_qops = {
612         .buf_setup      = buffer_setup,
613         .buf_prepare    = buffer_prepare,
614         .buf_queue      = buffer_queue,
615         .buf_release    = buffer_release,
616 };
617
618 /* ------------------------------------------------------------------
619         IOCTL vidioc handling
620    ------------------------------------------------------------------*/
621 static int vidioc_querycap(struct file *file, void  *priv,
622                                         struct v4l2_capability *cap)
623 {
624         strcpy(cap->driver, "vivi");
625         strcpy(cap->card, "vivi");
626         cap->version = VIVI_VERSION;
627         cap->capabilities =     V4L2_CAP_VIDEO_CAPTURE |
628                                 V4L2_CAP_STREAMING     |
629                                 V4L2_CAP_READWRITE;
630         return 0;
631 }
632
633 static int vidioc_enum_fmt_cap(struct file *file, void  *priv,
634                                         struct v4l2_fmtdesc *f)
635 {
636         if (f->index > 0)
637                 return -EINVAL;
638
639         strlcpy(f->description, format.name, sizeof(f->description));
640         f->pixelformat = format.fourcc;
641         return 0;
642 }
643
644 static int vidioc_g_fmt_cap(struct file *file, void *priv,
645                                         struct v4l2_format *f)
646 {
647         struct vivi_fh *fh = priv;
648
649         f->fmt.pix.width        = fh->width;
650         f->fmt.pix.height       = fh->height;
651         f->fmt.pix.field        = fh->vb_vidq.field;
652         f->fmt.pix.pixelformat  = fh->fmt->fourcc;
653         f->fmt.pix.bytesperline =
654                 (f->fmt.pix.width * fh->fmt->depth) >> 3;
655         f->fmt.pix.sizeimage =
656                 f->fmt.pix.height * f->fmt.pix.bytesperline;
657
658         return (0);
659 }
660
661 static int vidioc_try_fmt_cap(struct file *file, void *priv,
662                         struct v4l2_format *f)
663 {
664         struct vivi_fh  *fh  = priv;
665         struct vivi_dev *dev = fh->dev;
666         struct vivi_fmt *fmt;
667         enum v4l2_field field;
668         unsigned int maxw, maxh;
669
670         if (format.fourcc != f->fmt.pix.pixelformat) {
671                 dprintk(dev, 1, "Fourcc format (0x%08x) invalid. "
672                         "Driver accepts only 0x%08x\n",
673                         f->fmt.pix.pixelformat, format.fourcc);
674                 return -EINVAL;
675         }
676         fmt = &format;
677
678         field = f->fmt.pix.field;
679
680         if (field == V4L2_FIELD_ANY) {
681                 field = V4L2_FIELD_INTERLACED;
682         } else if (V4L2_FIELD_INTERLACED != field) {
683                 dprintk(dev, 1, "Field type invalid.\n");
684                 return -EINVAL;
685         }
686
687         maxw  = norm_maxw();
688         maxh  = norm_maxh();
689
690         f->fmt.pix.field = field;
691         if (f->fmt.pix.height < 32)
692                 f->fmt.pix.height = 32;
693         if (f->fmt.pix.height > maxh)
694                 f->fmt.pix.height = maxh;
695         if (f->fmt.pix.width < 48)
696                 f->fmt.pix.width = 48;
697         if (f->fmt.pix.width > maxw)
698                 f->fmt.pix.width = maxw;
699         f->fmt.pix.width &= ~0x03;
700         f->fmt.pix.bytesperline =
701                 (f->fmt.pix.width * fmt->depth) >> 3;
702         f->fmt.pix.sizeimage =
703                 f->fmt.pix.height * f->fmt.pix.bytesperline;
704
705         return 0;
706 }
707
708 /*FIXME: This seems to be generic enough to be at videodev2 */
709 static int vidioc_s_fmt_cap(struct file *file, void *priv,
710                                         struct v4l2_format *f)
711 {
712         struct vivi_fh  *fh = priv;
713         struct videobuf_queue *q = &fh->vb_vidq;
714
715         int ret = vidioc_try_fmt_cap(file, fh, f);
716         if (ret < 0)
717                 return (ret);
718
719         mutex_lock(&q->vb_lock);
720
721         if (videobuf_queue_is_busy(&fh->vb_vidq)) {
722                 dprintk(fh->dev, 1, "%s queue busy\n", __func__);
723                 ret = -EBUSY;
724                 goto out;
725         }
726
727         fh->fmt           = &format;
728         fh->width         = f->fmt.pix.width;
729         fh->height        = f->fmt.pix.height;
730         fh->vb_vidq.field = f->fmt.pix.field;
731         fh->type          = f->type;
732
733         ret = 0;
734 out:
735         mutex_unlock(&q->vb_lock);
736
737         return (ret);
738 }
739
740 static int vidioc_reqbufs(struct file *file, void *priv,
741                           struct v4l2_requestbuffers *p)
742 {
743         struct vivi_fh  *fh = priv;
744
745         return (videobuf_reqbufs(&fh->vb_vidq, p));
746 }
747
748 static int vidioc_querybuf(struct file *file, void *priv, struct v4l2_buffer *p)
749 {
750         struct vivi_fh  *fh = priv;
751
752         return (videobuf_querybuf(&fh->vb_vidq, p));
753 }
754
755 static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)
756 {
757         struct vivi_fh *fh = priv;
758
759         return (videobuf_qbuf(&fh->vb_vidq, p));
760 }
761
762 static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
763 {
764         struct vivi_fh  *fh = priv;
765
766         return (videobuf_dqbuf(&fh->vb_vidq, p,
767                                 file->f_flags & O_NONBLOCK));
768 }
769
770 #ifdef CONFIG_VIDEO_V4L1_COMPAT
771 static int vidiocgmbuf(struct file *file, void *priv, struct video_mbuf *mbuf)
772 {
773         struct vivi_fh  *fh = priv;
774
775         return videobuf_cgmbuf(&fh->vb_vidq, mbuf, 8);
776 }
777 #endif
778
779 static int vidioc_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
780 {
781         struct vivi_fh  *fh = priv;
782
783         if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
784                 return -EINVAL;
785         if (i != fh->type)
786                 return -EINVAL;
787
788         return videobuf_streamon(&fh->vb_vidq);
789 }
790
791 static int vidioc_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
792 {
793         struct vivi_fh  *fh = priv;
794
795         if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
796                 return -EINVAL;
797         if (i != fh->type)
798                 return -EINVAL;
799
800         return videobuf_streamoff(&fh->vb_vidq);
801 }
802
803 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *i)
804 {
805         return 0;
806 }
807
808 /* only one input in this sample driver */
809 static int vidioc_enum_input(struct file *file, void *priv,
810                                 struct v4l2_input *inp)
811 {
812         if (inp->index != 0)
813                 return -EINVAL;
814
815         inp->type = V4L2_INPUT_TYPE_CAMERA;
816         inp->std = V4L2_STD_525_60;
817         strcpy(inp->name, "Camera");
818
819         return (0);
820 }
821
822 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
823 {
824         *i = 0;
825
826         return (0);
827 }
828 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
829 {
830         if (i > 0)
831                 return -EINVAL;
832
833         return (0);
834 }
835
836         /* --- controls ---------------------------------------------- */
837 static int vidioc_queryctrl(struct file *file, void *priv,
838                             struct v4l2_queryctrl *qc)
839 {
840         int i;
841
842         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
843                 if (qc->id && qc->id == vivi_qctrl[i].id) {
844                         memcpy(qc, &(vivi_qctrl[i]),
845                                 sizeof(*qc));
846                         return (0);
847                 }
848
849         return -EINVAL;
850 }
851
852 static int vidioc_g_ctrl(struct file *file, void *priv,
853                          struct v4l2_control *ctrl)
854 {
855         int i;
856
857         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
858                 if (ctrl->id == vivi_qctrl[i].id) {
859                         ctrl->value = qctl_regs[i];
860                         return (0);
861                 }
862
863         return -EINVAL;
864 }
865 static int vidioc_s_ctrl(struct file *file, void *priv,
866                                 struct v4l2_control *ctrl)
867 {
868         int i;
869
870         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
871                 if (ctrl->id == vivi_qctrl[i].id) {
872                         if (ctrl->value < vivi_qctrl[i].minimum
873                             || ctrl->value > vivi_qctrl[i].maximum) {
874                                         return (-ERANGE);
875                                 }
876                         qctl_regs[i] = ctrl->value;
877                         return (0);
878                 }
879         return -EINVAL;
880 }
881
882 /* ------------------------------------------------------------------
883         File operations for the device
884    ------------------------------------------------------------------*/
885
886 #define line_buf_size(norm) (norm_maxw(norm)*(format.depth+7)/8)
887
888 static int vivi_open(struct inode *inode, struct file *file)
889 {
890         int minor = iminor(inode);
891         struct vivi_dev *dev;
892         struct vivi_fh *fh = NULL;
893         int i;
894         int retval = 0;
895
896         printk(KERN_DEBUG "vivi: open called (minor=%d)\n", minor);
897
898         list_for_each_entry(dev, &vivi_devlist, vivi_devlist)
899                 if (dev->vfd->minor == minor)
900                         goto found;
901         return -ENODEV;
902
903 found:
904         mutex_lock(&dev->mutex);
905         dev->users++;
906
907         if (dev->users > 1) {
908                 dev->users--;
909                 retval = -EBUSY;
910                 goto unlock;
911         }
912
913         dprintk(dev, 1, "open minor=%d type=%s users=%d\n", minor,
914                 v4l2_type_names[V4L2_BUF_TYPE_VIDEO_CAPTURE], dev->users);
915
916         /* allocate + initialize per filehandle data */
917         fh = kzalloc(sizeof(*fh), GFP_KERNEL);
918         if (NULL == fh) {
919                 dev->users--;
920                 retval = -ENOMEM;
921                 goto unlock;
922         }
923 unlock:
924         mutex_unlock(&dev->mutex);
925         if (retval)
926                 return retval;
927
928         file->private_data = fh;
929         fh->dev      = dev;
930
931         fh->type     = V4L2_BUF_TYPE_VIDEO_CAPTURE;
932         fh->fmt      = &format;
933         fh->width    = 640;
934         fh->height   = 480;
935
936         /* Put all controls at a sane state */
937         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
938                 qctl_regs[i] = vivi_qctrl[i].default_value;
939
940         /* Resets frame counters */
941         dev->h = 0;
942         dev->m = 0;
943         dev->s = 0;
944         dev->ms = 0;
945         dev->mv_count = 0;
946         dev->jiffies = jiffies;
947         sprintf(dev->timestr, "%02d:%02d:%02d:%03d",
948                         dev->h, dev->m, dev->s, dev->ms);
949
950         videobuf_queue_vmalloc_init(&fh->vb_vidq, &vivi_video_qops,
951                         NULL, &dev->slock, fh->type, V4L2_FIELD_INTERLACED,
952                         sizeof(struct vivi_buffer), fh);
953
954         vivi_start_thread(fh);
955
956         return 0;
957 }
958
959 static ssize_t
960 vivi_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
961 {
962         struct vivi_fh *fh = file->private_data;
963
964         if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
965                 return videobuf_read_stream(&fh->vb_vidq, data, count, ppos, 0,
966                                         file->f_flags & O_NONBLOCK);
967         }
968         return 0;
969 }
970
971 static unsigned int
972 vivi_poll(struct file *file, struct poll_table_struct *wait)
973 {
974         struct vivi_fh        *fh = file->private_data;
975         struct vivi_dev       *dev = fh->dev;
976         struct videobuf_queue *q = &fh->vb_vidq;
977
978         dprintk(dev, 1, "%s\n", __func__);
979
980         if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
981                 return POLLERR;
982
983         return videobuf_poll_stream(file, q, wait);
984 }
985
986 static int vivi_close(struct inode *inode, struct file *file)
987 {
988         struct vivi_fh         *fh = file->private_data;
989         struct vivi_dev *dev       = fh->dev;
990         struct vivi_dmaqueue *vidq = &dev->vidq;
991
992         int minor = iminor(inode);
993
994         vivi_stop_thread(vidq);
995         videobuf_stop(&fh->vb_vidq);
996         videobuf_mmap_free(&fh->vb_vidq);
997
998         kfree(fh);
999
1000         mutex_lock(&dev->mutex);
1001         dev->users--;
1002         mutex_unlock(&dev->mutex);
1003
1004         dprintk(dev, 1, "close called (minor=%d, users=%d)\n",
1005                 minor, dev->users);
1006
1007         return 0;
1008 }
1009
1010 static int vivi_release(void)
1011 {
1012         struct vivi_dev *dev;
1013         struct list_head *list;
1014
1015         while (!list_empty(&vivi_devlist)) {
1016                 list = vivi_devlist.next;
1017                 list_del(list);
1018                 dev = list_entry(list, struct vivi_dev, vivi_devlist);
1019
1020                 if (-1 != dev->vfd->minor)
1021                         video_unregister_device(dev->vfd);
1022                 else
1023                         video_device_release(dev->vfd);
1024
1025                 kfree(dev);
1026         }
1027
1028         return 0;
1029 }
1030
1031 static int vivi_mmap(struct file *file, struct vm_area_struct *vma)
1032 {
1033         struct vivi_fh  *fh = file->private_data;
1034         struct vivi_dev *dev = fh->dev;
1035         int ret;
1036
1037         dprintk(dev, 1, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
1038
1039         ret = videobuf_mmap_mapper(&fh->vb_vidq, vma);
1040
1041         dprintk(dev, 1, "vma start=0x%08lx, size=%ld, ret=%d\n",
1042                 (unsigned long)vma->vm_start,
1043                 (unsigned long)vma->vm_end-(unsigned long)vma->vm_start,
1044                 ret);
1045
1046         return ret;
1047 }
1048
1049 static const struct file_operations vivi_fops = {
1050         .owner          = THIS_MODULE,
1051         .open           = vivi_open,
1052         .release        = vivi_close,
1053         .read           = vivi_read,
1054         .poll           = vivi_poll,
1055         .ioctl          = video_ioctl2, /* V4L2 ioctl handler */
1056         .compat_ioctl   = v4l_compat_ioctl32,
1057         .mmap           = vivi_mmap,
1058         .llseek         = no_llseek,
1059 };
1060
1061 static struct video_device vivi_template = {
1062         .name           = "vivi",
1063         .type           = VID_TYPE_CAPTURE,
1064         .fops           = &vivi_fops,
1065         .minor          = -1,
1066         .release        = video_device_release,
1067
1068         .vidioc_querycap      = vidioc_querycap,
1069         .vidioc_enum_fmt_cap  = vidioc_enum_fmt_cap,
1070         .vidioc_g_fmt_cap     = vidioc_g_fmt_cap,
1071         .vidioc_try_fmt_cap   = vidioc_try_fmt_cap,
1072         .vidioc_s_fmt_cap     = vidioc_s_fmt_cap,
1073         .vidioc_reqbufs       = vidioc_reqbufs,
1074         .vidioc_querybuf      = vidioc_querybuf,
1075         .vidioc_qbuf          = vidioc_qbuf,
1076         .vidioc_dqbuf         = vidioc_dqbuf,
1077         .vidioc_s_std         = vidioc_s_std,
1078         .vidioc_enum_input    = vidioc_enum_input,
1079         .vidioc_g_input       = vidioc_g_input,
1080         .vidioc_s_input       = vidioc_s_input,
1081         .vidioc_queryctrl     = vidioc_queryctrl,
1082         .vidioc_g_ctrl        = vidioc_g_ctrl,
1083         .vidioc_s_ctrl        = vidioc_s_ctrl,
1084         .vidioc_streamon      = vidioc_streamon,
1085         .vidioc_streamoff     = vidioc_streamoff,
1086 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1087         .vidiocgmbuf          = vidiocgmbuf,
1088 #endif
1089         .tvnorms              = V4L2_STD_525_60,
1090         .current_norm         = V4L2_STD_NTSC_M,
1091 };
1092 /* -----------------------------------------------------------------
1093         Initialization and module stuff
1094    ------------------------------------------------------------------*/
1095
1096 static int __init vivi_init(void)
1097 {
1098         int ret = -ENOMEM, i;
1099         struct vivi_dev *dev;
1100         struct video_device *vfd;
1101
1102         for (i = 0; i < n_devs; i++) {
1103                 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1104                 if (NULL == dev)
1105                         break;
1106
1107                 list_add_tail(&dev->vivi_devlist, &vivi_devlist);
1108
1109                 /* init video dma queues */
1110                 INIT_LIST_HEAD(&dev->vidq.active);
1111                 init_waitqueue_head(&dev->vidq.wq);
1112
1113                 /* initialize locks */
1114                 spin_lock_init(&dev->slock);
1115                 mutex_init(&dev->mutex);
1116
1117                 vfd = video_device_alloc();
1118                 if (NULL == vfd)
1119                         break;
1120
1121                 *vfd = vivi_template;
1122
1123                 ret = video_register_device(vfd, VFL_TYPE_GRABBER, video_nr);
1124                 if (ret < 0)
1125                         break;
1126
1127                 snprintf(vfd->name, sizeof(vfd->name), "%s (%i)",
1128                          vivi_template.name, vfd->minor);
1129
1130                 if (video_nr >= 0)
1131                         video_nr++;
1132
1133                 dev->vfd = vfd;
1134         }
1135
1136         if (ret < 0) {
1137                 vivi_release();
1138                 printk(KERN_INFO "Error %d while loading vivi driver\n", ret);
1139         } else
1140                 printk(KERN_INFO "Video Technology Magazine Virtual Video "
1141                                  "Capture Board successfully loaded.\n");
1142         return ret;
1143 }
1144
1145 static void __exit vivi_exit(void)
1146 {
1147         vivi_release();
1148 }
1149
1150 module_init(vivi_init);
1151 module_exit(vivi_exit);
1152
1153 MODULE_DESCRIPTION("Video Technology Magazine Virtual Video Capture Board");
1154 MODULE_AUTHOR("Mauro Carvalho Chehab, Ted Walther and John Sokol");
1155 MODULE_LICENSE("Dual BSD/GPL");
1156
1157 module_param(video_nr, int, 0);
1158 MODULE_PARM_DESC(video_nr, "video iminor start number");
1159
1160 module_param(n_devs, int, 0);
1161 MODULE_PARM_DESC(n_devs, "number of video devices to create");
1162
1163 module_param_named(debug, vivi_template.debug, int, 0444);
1164 MODULE_PARM_DESC(debug, "activates debug info");
1165
1166 module_param(vid_limit, int, 0644);
1167 MODULE_PARM_DESC(vid_limit, "capture memory limit in megabytes");