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V4L/DVB (6806): Allow emulating changes of video std by vivi
[deliverable/linux.git] / 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 struct video_device vivi; /* Video device */
58 static int video_nr = -1; /* /dev/videoN, -1 for autodetect */
59 static int n_devs = 1; /* Number of virtual devices */
60
61 /* supported controls */
62 static struct v4l2_queryctrl vivi_qctrl[] = {
63 {
64 .id = V4L2_CID_AUDIO_VOLUME,
65 .name = "Volume",
66 .minimum = 0,
67 .maximum = 65535,
68 .step = 65535/100,
69 .default_value = 65535,
70 .flags = 0,
71 .type = V4L2_CTRL_TYPE_INTEGER,
72 }, {
73 .id = V4L2_CID_BRIGHTNESS,
74 .type = V4L2_CTRL_TYPE_INTEGER,
75 .name = "Brightness",
76 .minimum = 0,
77 .maximum = 255,
78 .step = 1,
79 .default_value = 127,
80 .flags = 0,
81 }, {
82 .id = V4L2_CID_CONTRAST,
83 .type = V4L2_CTRL_TYPE_INTEGER,
84 .name = "Contrast",
85 .minimum = 0,
86 .maximum = 255,
87 .step = 0x1,
88 .default_value = 0x10,
89 .flags = 0,
90 }, {
91 .id = V4L2_CID_SATURATION,
92 .type = V4L2_CTRL_TYPE_INTEGER,
93 .name = "Saturation",
94 .minimum = 0,
95 .maximum = 255,
96 .step = 0x1,
97 .default_value = 127,
98 .flags = 0,
99 }, {
100 .id = V4L2_CID_HUE,
101 .type = V4L2_CTRL_TYPE_INTEGER,
102 .name = "Hue",
103 .minimum = -128,
104 .maximum = 127,
105 .step = 0x1,
106 .default_value = 0,
107 .flags = 0,
108 }
109 };
110
111 static int qctl_regs[ARRAY_SIZE(vivi_qctrl)];
112
113 #define dprintk(level, fmt, arg...) \
114 do { \
115 if (vivi.debug >= (level)) \
116 printk(KERN_DEBUG "vivi: " fmt , ## arg); \
117 } while (0)
118
119 /* ------------------------------------------------------------------
120 Basic structures
121 ------------------------------------------------------------------*/
122
123 struct vivi_fmt {
124 char *name;
125 u32 fourcc; /* v4l2 format id */
126 int depth;
127 };
128
129 static struct vivi_fmt format = {
130 .name = "4:2:2, packed, YUYV",
131 .fourcc = V4L2_PIX_FMT_YUYV,
132 .depth = 16,
133 };
134
135 struct sg_to_addr {
136 int pos;
137 struct scatterlist *sg;
138 };
139
140 /* buffer for one video frame */
141 struct vivi_buffer {
142 /* common v4l buffer stuff -- must be first */
143 struct videobuf_buffer vb;
144
145 struct vivi_fmt *fmt;
146 };
147
148 struct vivi_dmaqueue {
149 struct list_head active;
150 struct list_head queued;
151 struct timer_list timeout;
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 struct mutex lock;
167
168 int users;
169
170 /* various device info */
171 struct video_device *vfd;
172
173 struct vivi_dmaqueue vidq;
174
175 /* Several counters */
176 int h, m, s, us, jiffies;
177 char timestr[13];
178
179 int mv_count; /* Controls bars movement */
180 };
181
182 struct vivi_fh {
183 struct vivi_dev *dev;
184
185 /* video capture */
186 struct vivi_fmt *fmt;
187 unsigned int width, height;
188 struct videobuf_queue vb_vidq;
189
190 enum v4l2_buf_type type;
191 };
192
193 /* ------------------------------------------------------------------
194 DMA and thread functions
195 ------------------------------------------------------------------*/
196
197 /* Bars and Colors should match positions */
198
199 enum colors {
200 WHITE,
201 AMBAR,
202 CYAN,
203 GREEN,
204 MAGENTA,
205 RED,
206 BLUE,
207 BLACK,
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}, /* black */
220 };
221
222 #define TO_Y(r, g, b) \
223 (((16829 * r + 33039 * g + 6416 * b + 32768) >> 16) + 16)
224 /* RGB to V(Cr) Color transform */
225 #define TO_V(r, g, b) \
226 (((28784 * r - 24103 * g - 4681 * b + 32768) >> 16) + 128)
227 /* RGB to U(Cb) Color transform */
228 #define TO_U(r, g, b) \
229 (((-9714 * r - 19070 * g + 28784 * b + 32768) >> 16) + 128)
230
231 #define TSTAMP_MIN_Y 24
232 #define TSTAMP_MAX_Y TSTAMP_MIN_Y+15
233 #define TSTAMP_MIN_X 64
234
235 static void gen_line(char *basep, int inipos, int wmax,
236 int hmax, int line, int count, char *timestr)
237 {
238 int w, i, j, y;
239 int pos = inipos;
240 char *p, *s;
241 u8 chr, r, g, b, color;
242
243 /* We will just duplicate the second pixel at the packet */
244 wmax /= 2;
245
246 /* Generate a standard color bar pattern */
247 for (w = 0; w < wmax; w++) {
248 int colorpos = ((w + count) * 8/(wmax + 1)) % 8;
249 r = bars[colorpos][0];
250 g = bars[colorpos][1];
251 b = bars[colorpos][2];
252
253 for (color = 0; color < 4; color++) {
254 p = basep + pos;
255
256 switch (color) {
257 case 0:
258 case 2:
259 *p = TO_Y(r, g, b); /* Luma */
260 break;
261 case 1:
262 *p = TO_U(r, g, b); /* Cb */
263 break;
264 case 3:
265 *p = TO_V(r, g, b); /* Cr */
266 break;
267 }
268 pos++;
269 }
270 }
271
272 /* Checks if it is possible to show timestamp */
273 if (TSTAMP_MAX_Y >= hmax)
274 goto end;
275 if (TSTAMP_MIN_X + strlen(timestr) >= wmax)
276 goto end;
277
278 /* Print stream time */
279 if (line >= TSTAMP_MIN_Y && line <= TSTAMP_MAX_Y) {
280 j = TSTAMP_MIN_X;
281 for (s = timestr; *s; s++) {
282 chr = rom8x16_bits[(*s-0x30)*16+line-TSTAMP_MIN_Y];
283 for (i = 0; i < 7; i++) {
284 if (chr & 1 << (7 - i)) {
285 /* Font color*/
286 r = 0;
287 g = 198;
288 b = 0;
289 } else {
290 /* Background color */
291 r = bars[BLACK][0];
292 g = bars[BLACK][1];
293 b = bars[BLACK][2];
294 }
295
296 pos = inipos + j * 2;
297 for (color = 0; color < 4; color++) {
298 p = basep + pos;
299
300 y = TO_Y(r, g, b);
301
302 switch (color) {
303 case 0:
304 case 2:
305 *p = TO_Y(r, g, b); /* Luma */
306 break;
307 case 1:
308 *p = TO_U(r, g, b); /* Cb */
309 break;
310 case 3:
311 *p = TO_V(r, g, b); /* Cr */
312 break;
313 }
314 pos++;
315 }
316 j++;
317 }
318 }
319 }
320
321 end:
322 return;
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 = kmalloc(wmax * 2, GFP_KERNEL);
331 void *vbuf = videobuf_to_vmalloc(&buf->vb);
332
333 if (!tmpbuf)
334 return;
335
336 for (h = 0; h < hmax; h++) {
337 gen_line(tmpbuf, 0, wmax, hmax, h, dev->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 dev->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 = VIDEOBUF_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",
422 __FUNCTION__, bc);
423 }
424
425 static void vivi_sleep(struct vivi_dmaqueue *dma_q)
426 {
427 int timeout;
428 DECLARE_WAITQUEUE(wait, current);
429
430 dprintk(1, "%s dma_q=0x%08lx\n", __FUNCTION__, (unsigned long)dma_q);
431
432 add_wait_queue(&dma_q->wq, &wait);
433 if (!kthread_should_stop()) {
434 dma_q->frame++;
435
436 /* Calculate time to wake up */
437 timeout = dma_q->ini_jiffies+
438 msecs_to_jiffies((dma_q->frame*WAKE_NUMERATOR * 1000)
439 / WAKE_DENOMINATOR) - jiffies;
440
441 if (timeout <= 0) {
442 int old = dma_q->frame;
443 dma_q->frame = (jiffies_to_msecs(jiffies -
444 dma_q->ini_jiffies) *
445 WAKE_DENOMINATOR) /
446 (WAKE_NUMERATOR * 1000) + 1;
447
448 timeout = dma_q->ini_jiffies+
449 msecs_to_jiffies((dma_q->frame *
450 WAKE_NUMERATOR * 1000)
451 / WAKE_DENOMINATOR) - jiffies;
452
453 dprintk(1, "underrun, losed %d frames. "
454 "Now, frame is %d. Waking on %d jiffies\n",
455 dma_q->frame-old, dma_q->frame, timeout);
456 } else
457 dprintk(1, "will sleep for %i jiffies\n", timeout);
458
459 vivi_thread_tick(dma_q);
460
461 schedule_timeout_interruptible(timeout);
462 }
463
464 remove_wait_queue(&dma_q->wq, &wait);
465 try_to_freeze();
466 }
467
468 static int vivi_thread(void *data)
469 {
470 struct vivi_dmaqueue *dma_q = data;
471
472 dprintk(1, "thread started\n");
473
474 mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
475 set_freezable();
476
477 for (;;) {
478 vivi_sleep(dma_q);
479
480 if (kthread_should_stop())
481 break;
482 }
483 dprintk(1, "thread: exit\n");
484 return 0;
485 }
486
487 static int vivi_start_thread(struct vivi_dmaqueue *dma_q)
488 {
489 dma_q->frame = 0;
490 dma_q->ini_jiffies = jiffies;
491
492 dprintk(1, "%s\n", __FUNCTION__);
493
494 dma_q->kthread = kthread_run(vivi_thread, dma_q, "vivi");
495
496 if (IS_ERR(dma_q->kthread)) {
497 printk(KERN_ERR "vivi: kernel_thread() failed\n");
498 return PTR_ERR(dma_q->kthread);
499 }
500 /* Wakes thread */
501 wake_up_interruptible(&dma_q->wq);
502
503 dprintk(1, "returning from %s\n", __FUNCTION__);
504 return 0;
505 }
506
507 static void vivi_stop_thread(struct vivi_dmaqueue *dma_q)
508 {
509 dprintk(1, "%s\n", __FUNCTION__);
510 /* shutdown control thread */
511 if (dma_q->kthread) {
512 kthread_stop(dma_q->kthread);
513 dma_q->kthread = NULL;
514 }
515 }
516
517 static int restart_video_queue(struct vivi_dmaqueue *dma_q)
518 {
519 struct vivi_buffer *buf, *prev;
520
521 dprintk(1, "%s dma_q=0x%08lx\n", __FUNCTION__, (unsigned long)dma_q);
522
523 if (!list_empty(&dma_q->active)) {
524 buf = list_entry(dma_q->active.next,
525 struct vivi_buffer, vb.queue);
526 dprintk(2, "restart_queue [%p/%d]: restart dma\n",
527 buf, buf->vb.i);
528
529 dprintk(1, "Restarting video dma\n");
530 vivi_stop_thread(dma_q);
531
532 /* cancel all outstanding capture / vbi requests */
533 list_for_each_entry_safe(buf, prev, &dma_q->active, vb.queue) {
534 list_del(&buf->vb.queue);
535 buf->vb.state = VIDEOBUF_ERROR;
536 wake_up(&buf->vb.done);
537 }
538 mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
539
540 return 0;
541 }
542
543 prev = NULL;
544 for (;;) {
545 if (list_empty(&dma_q->queued))
546 return 0;
547 buf = list_entry(dma_q->queued.next,
548 struct vivi_buffer, vb.queue);
549 if (NULL == prev) {
550 list_del(&buf->vb.queue);
551 list_add_tail(&buf->vb.queue, &dma_q->active);
552
553 dprintk(1, "Restarting video dma\n");
554 vivi_stop_thread(dma_q);
555 vivi_start_thread(dma_q);
556
557 buf->vb.state = VIDEOBUF_ACTIVE;
558 mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
559 dprintk(2, "[%p/%d] restart_queue - first active\n",
560 buf, buf->vb.i);
561
562 } else if (prev->vb.width == buf->vb.width &&
563 prev->vb.height == buf->vb.height &&
564 prev->fmt == buf->fmt) {
565 list_del(&buf->vb.queue);
566 list_add_tail(&buf->vb.queue, &dma_q->active);
567 buf->vb.state = VIDEOBUF_ACTIVE;
568 dprintk(2, "[%p/%d] restart_queue - move to active\n",
569 buf, buf->vb.i);
570 } else {
571 return 0;
572 }
573 prev = buf;
574 }
575 }
576
577 static void vivi_vid_timeout(unsigned long data)
578 {
579 struct vivi_dev *dev = (struct vivi_dev *)data;
580 struct vivi_dmaqueue *vidq = &dev->vidq;
581 struct vivi_buffer *buf;
582
583 while (!list_empty(&vidq->active)) {
584 buf = list_entry(vidq->active.next,
585 struct vivi_buffer, vb.queue);
586 list_del(&buf->vb.queue);
587 buf->vb.state = VIDEOBUF_ERROR;
588 wake_up(&buf->vb.done);
589 printk(KERN_INFO "vivi/0: [%p/%d] timeout\n", buf, buf->vb.i);
590 }
591
592 restart_video_queue(vidq);
593 }
594
595 /* ------------------------------------------------------------------
596 Videobuf operations
597 ------------------------------------------------------------------*/
598 static int
599 buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
600 {
601 struct vivi_fh *fh = vq->priv_data;
602
603 *size = fh->width*fh->height*2;
604
605 if (0 == *count)
606 *count = 32;
607
608 while (*size * *count > vid_limit * 1024 * 1024)
609 (*count)--;
610
611 dprintk(1, "%s, count=%d, size=%d\n", __FUNCTION__, *count, *size);
612
613 return 0;
614 }
615
616 static void free_buffer(struct videobuf_queue *vq, struct vivi_buffer *buf)
617 {
618 dprintk(1, "%s\n", __FUNCTION__);
619
620 if (in_interrupt())
621 BUG();
622
623 videobuf_waiton(&buf->vb, 0, 0);
624 videobuf_vmalloc_free(&buf->vb);
625 buf->vb.state = VIDEOBUF_NEEDS_INIT;
626 }
627
628 #define norm_maxw() 1024
629 #define norm_maxh() 768
630 static int
631 buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
632 enum v4l2_field field)
633 {
634 struct vivi_fh *fh = vq->priv_data;
635 struct vivi_buffer *buf = container_of(vb, struct vivi_buffer, vb);
636 int rc, init_buffer = 0;
637
638 dprintk(1, "%s, field=%d\n", __FUNCTION__, field);
639
640 BUG_ON(NULL == fh->fmt);
641 if (fh->width < 48 || fh->width > norm_maxw() ||
642 fh->height < 32 || fh->height > norm_maxh())
643 return -EINVAL;
644 buf->vb.size = fh->width*fh->height*2;
645 if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
646 return -EINVAL;
647
648 if (buf->fmt != fh->fmt ||
649 buf->vb.width != fh->width ||
650 buf->vb.height != fh->height ||
651 buf->vb.field != field) {
652 buf->fmt = fh->fmt;
653 buf->vb.width = fh->width;
654 buf->vb.height = fh->height;
655 buf->vb.field = field;
656 init_buffer = 1;
657 }
658
659 if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
660 rc = videobuf_iolock(vq, &buf->vb, NULL);
661 if (rc < 0)
662 goto fail;
663 }
664
665 buf->vb.state = VIDEOBUF_PREPARED;
666
667 return 0;
668
669 fail:
670 free_buffer(vq, buf);
671 return rc;
672 }
673
674 static void
675 buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
676 {
677 struct vivi_buffer *buf = container_of(vb, struct vivi_buffer, vb);
678 struct vivi_fh *fh = vq->priv_data;
679 struct vivi_dev *dev = fh->dev;
680 struct vivi_dmaqueue *vidq = &dev->vidq;
681 struct vivi_buffer *prev;
682
683 if (!list_empty(&vidq->queued)) {
684 dprintk(1, "adding vb queue=0x%08lx\n",
685 (unsigned long)&buf->vb.queue);
686 list_add_tail(&buf->vb.queue, &vidq->queued);
687 buf->vb.state = VIDEOBUF_QUEUED;
688 dprintk(2, "[%p/%d] buffer_queue - append to queued\n",
689 buf, buf->vb.i);
690 } else if (list_empty(&vidq->active)) {
691 list_add_tail(&buf->vb.queue, &vidq->active);
692
693 buf->vb.state = VIDEOBUF_ACTIVE;
694 mod_timer(&vidq->timeout, jiffies+BUFFER_TIMEOUT);
695 dprintk(2, "[%p/%d] buffer_queue - first active\n",
696 buf, buf->vb.i);
697
698 vivi_start_thread(vidq);
699 } else {
700 prev = list_entry(vidq->active.prev,
701 struct vivi_buffer, vb.queue);
702 if (prev->vb.width == buf->vb.width &&
703 prev->vb.height == buf->vb.height &&
704 prev->fmt == buf->fmt) {
705 list_add_tail(&buf->vb.queue, &vidq->active);
706 buf->vb.state = VIDEOBUF_ACTIVE;
707 dprintk(2, "[%p/%d] buffer_queue - append to active\n",
708 buf, buf->vb.i);
709
710 } else {
711 list_add_tail(&buf->vb.queue, &vidq->queued);
712 buf->vb.state = VIDEOBUF_QUEUED;
713 dprintk(2, "[%p/%d] buffer_queue - first queued\n",
714 buf, buf->vb.i);
715 }
716 }
717 }
718
719 static void buffer_release(struct videobuf_queue *vq,
720 struct videobuf_buffer *vb)
721 {
722 struct vivi_buffer *buf = container_of(vb, struct vivi_buffer, vb);
723 struct vivi_fh *fh = vq->priv_data;
724 struct vivi_dev *dev = (struct vivi_dev *)fh->dev;
725 struct vivi_dmaqueue *vidq = &dev->vidq;
726
727 dprintk(1, "%s\n", __FUNCTION__);
728
729 vivi_stop_thread(vidq);
730
731 free_buffer(vq, buf);
732 }
733
734 static struct videobuf_queue_ops vivi_video_qops = {
735 .buf_setup = buffer_setup,
736 .buf_prepare = buffer_prepare,
737 .buf_queue = buffer_queue,
738 .buf_release = buffer_release,
739 };
740
741 /* ------------------------------------------------------------------
742 IOCTL vidioc handling
743 ------------------------------------------------------------------*/
744 static int vidioc_querycap(struct file *file, void *priv,
745 struct v4l2_capability *cap)
746 {
747 strcpy(cap->driver, "vivi");
748 strcpy(cap->card, "vivi");
749 cap->version = VIVI_VERSION;
750 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE |
751 V4L2_CAP_STREAMING |
752 V4L2_CAP_READWRITE;
753 return 0;
754 }
755
756 static int vidioc_enum_fmt_cap(struct file *file, void *priv,
757 struct v4l2_fmtdesc *f)
758 {
759 if (f->index > 0)
760 return -EINVAL;
761
762 strlcpy(f->description, format.name, sizeof(f->description));
763 f->pixelformat = format.fourcc;
764 return 0;
765 }
766
767 static int vidioc_g_fmt_cap(struct file *file, void *priv,
768 struct v4l2_format *f)
769 {
770 struct vivi_fh *fh = priv;
771
772 f->fmt.pix.width = fh->width;
773 f->fmt.pix.height = fh->height;
774 f->fmt.pix.field = fh->vb_vidq.field;
775 f->fmt.pix.pixelformat = fh->fmt->fourcc;
776 f->fmt.pix.bytesperline =
777 (f->fmt.pix.width * fh->fmt->depth) >> 3;
778 f->fmt.pix.sizeimage =
779 f->fmt.pix.height * f->fmt.pix.bytesperline;
780
781 return (0);
782 }
783
784 static int vidioc_try_fmt_cap(struct file *file, void *priv,
785 struct v4l2_format *f)
786 {
787 struct vivi_fmt *fmt;
788 enum v4l2_field field;
789 unsigned int maxw, maxh;
790
791 if (format.fourcc != f->fmt.pix.pixelformat) {
792 dprintk(1, "Fourcc format (0x%08x) invalid. Driver accepts "
793 "only 0x%08x\n", f->fmt.pix.pixelformat, format.fourcc);
794 return -EINVAL;
795 }
796 fmt = &format;
797
798 field = f->fmt.pix.field;
799
800 if (field == V4L2_FIELD_ANY) {
801 field = V4L2_FIELD_INTERLACED;
802 } else if (V4L2_FIELD_INTERLACED != field) {
803 dprintk(1, "Field type invalid.\n");
804 return -EINVAL;
805 }
806
807 maxw = norm_maxw();
808 maxh = norm_maxh();
809
810 f->fmt.pix.field = field;
811 if (f->fmt.pix.height < 32)
812 f->fmt.pix.height = 32;
813 if (f->fmt.pix.height > maxh)
814 f->fmt.pix.height = maxh;
815 if (f->fmt.pix.width < 48)
816 f->fmt.pix.width = 48;
817 if (f->fmt.pix.width > maxw)
818 f->fmt.pix.width = maxw;
819 f->fmt.pix.width &= ~0x03;
820 f->fmt.pix.bytesperline =
821 (f->fmt.pix.width * fmt->depth) >> 3;
822 f->fmt.pix.sizeimage =
823 f->fmt.pix.height * f->fmt.pix.bytesperline;
824
825 return 0;
826 }
827
828 /*FIXME: This seems to be generic enough to be at videodev2 */
829 static int vidioc_s_fmt_cap(struct file *file, void *priv,
830 struct v4l2_format *f)
831 {
832 struct vivi_fh *fh = priv;
833 int ret = vidioc_try_fmt_cap(file, fh, f);
834 if (ret < 0)
835 return (ret);
836
837 fh->fmt = &format;
838 fh->width = f->fmt.pix.width;
839 fh->height = f->fmt.pix.height;
840 fh->vb_vidq.field = f->fmt.pix.field;
841 fh->type = f->type;
842
843 return (0);
844 }
845
846 static int vidioc_reqbufs(struct file *file, void *priv,
847 struct v4l2_requestbuffers *p)
848 {
849 struct vivi_fh *fh = priv;
850
851 return (videobuf_reqbufs(&fh->vb_vidq, p));
852 }
853
854 static int vidioc_querybuf(struct file *file, void *priv, struct v4l2_buffer *p)
855 {
856 struct vivi_fh *fh = priv;
857
858 return (videobuf_querybuf(&fh->vb_vidq, p));
859 }
860
861 static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)
862 {
863 struct vivi_fh *fh = priv;
864
865 return (videobuf_qbuf(&fh->vb_vidq, p));
866 }
867
868 static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
869 {
870 struct vivi_fh *fh = priv;
871
872 return (videobuf_dqbuf(&fh->vb_vidq, p,
873 file->f_flags & O_NONBLOCK));
874 }
875
876 #ifdef CONFIG_VIDEO_V4L1_COMPAT
877 static int vidiocgmbuf(struct file *file, void *priv, struct video_mbuf *mbuf)
878 {
879 struct vivi_fh *fh = priv;
880
881 return videobuf_cgmbuf(&fh->vb_vidq, mbuf, 8);
882 }
883 #endif
884
885 static int vidioc_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
886 {
887 struct vivi_fh *fh = priv;
888
889 if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
890 return -EINVAL;
891 if (i != fh->type)
892 return -EINVAL;
893
894 return videobuf_streamon(&fh->vb_vidq);
895 }
896
897 static int vidioc_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
898 {
899 struct vivi_fh *fh = priv;
900
901 if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
902 return -EINVAL;
903 if (i != fh->type)
904 return -EINVAL;
905
906 return videobuf_streamoff(&fh->vb_vidq);
907 }
908
909 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *i)
910 {
911 return 0;
912 }
913
914 /* only one input in this sample driver */
915 static int vidioc_enum_input(struct file *file, void *priv,
916 struct v4l2_input *inp)
917 {
918 if (inp->index != 0)
919 return -EINVAL;
920
921 inp->type = V4L2_INPUT_TYPE_CAMERA;
922 inp->std = V4L2_STD_525_60;
923 strcpy(inp->name, "Camera");
924
925 return (0);
926 }
927
928 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
929 {
930 *i = 0;
931
932 return (0);
933 }
934 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
935 {
936 if (i > 0)
937 return -EINVAL;
938
939 return (0);
940 }
941
942 /* --- controls ---------------------------------------------- */
943 static int vidioc_queryctrl(struct file *file, void *priv,
944 struct v4l2_queryctrl *qc)
945 {
946 int i;
947
948 for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
949 if (qc->id && qc->id == vivi_qctrl[i].id) {
950 memcpy(qc, &(vivi_qctrl[i]),
951 sizeof(*qc));
952 return (0);
953 }
954
955 return -EINVAL;
956 }
957
958 static int vidioc_g_ctrl(struct file *file, void *priv,
959 struct v4l2_control *ctrl)
960 {
961 int i;
962
963 for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
964 if (ctrl->id == vivi_qctrl[i].id) {
965 ctrl->value = qctl_regs[i];
966 return (0);
967 }
968
969 return -EINVAL;
970 }
971 static int vidioc_s_ctrl(struct file *file, void *priv,
972 struct v4l2_control *ctrl)
973 {
974 int i;
975
976 for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
977 if (ctrl->id == vivi_qctrl[i].id) {
978 if (ctrl->value < vivi_qctrl[i].minimum
979 || ctrl->value > vivi_qctrl[i].maximum) {
980 return (-ERANGE);
981 }
982 qctl_regs[i] = ctrl->value;
983 return (0);
984 }
985 return -EINVAL;
986 }
987
988 /* ------------------------------------------------------------------
989 File operations for the device
990 ------------------------------------------------------------------*/
991
992 #define line_buf_size(norm) (norm_maxw(norm)*(format.depth+7)/8)
993
994 static int vivi_open(struct inode *inode, struct file *file)
995 {
996 int minor = iminor(inode);
997 struct vivi_dev *dev;
998 struct vivi_fh *fh;
999 int i;
1000
1001 printk(KERN_DEBUG "vivi: open called (minor=%d)\n", minor);
1002
1003 list_for_each_entry(dev, &vivi_devlist, vivi_devlist)
1004 if (dev->vfd->minor == minor)
1005 goto found;
1006 return -ENODEV;
1007
1008 found:
1009 /* If more than one user, mutex should be added */
1010 dev->users++;
1011
1012 dprintk(1, "open minor=%d type=%s users=%d\n", minor,
1013 v4l2_type_names[V4L2_BUF_TYPE_VIDEO_CAPTURE], dev->users);
1014
1015 /* allocate + initialize per filehandle data */
1016 fh = kzalloc(sizeof(*fh), GFP_KERNEL);
1017 if (NULL == fh) {
1018 dev->users--;
1019 return -ENOMEM;
1020 }
1021
1022 file->private_data = fh;
1023 fh->dev = dev;
1024
1025 fh->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1026 fh->fmt = &format;
1027 fh->width = 640;
1028 fh->height = 480;
1029
1030 /* Put all controls at a sane state */
1031 for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1032 qctl_regs[i] = vivi_qctrl[i].default_value;
1033
1034 /* Resets frame counters */
1035 dev->h = 0;
1036 dev->m = 0;
1037 dev->s = 0;
1038 dev->us = 0;
1039 dev->mv_count = 0;
1040 dev->jiffies = jiffies;
1041 sprintf(dev->timestr, "%02d:%02d:%02d:%03d",
1042 dev->h, dev->m, dev->s, (dev->us + 500) / 1000);
1043
1044 videobuf_queue_vmalloc_init(&fh->vb_vidq, &vivi_video_qops,
1045 NULL, NULL, fh->type, V4L2_FIELD_INTERLACED,
1046 sizeof(struct vivi_buffer), fh);
1047
1048 return 0;
1049 }
1050
1051 static ssize_t
1052 vivi_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
1053 {
1054 struct vivi_fh *fh = file->private_data;
1055
1056 if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
1057 return videobuf_read_stream(&fh->vb_vidq, data, count, ppos, 0,
1058 file->f_flags & O_NONBLOCK);
1059 }
1060 return 0;
1061 }
1062
1063 static unsigned int
1064 vivi_poll(struct file *file, struct poll_table_struct *wait)
1065 {
1066 struct vivi_fh *fh = file->private_data;
1067 struct videobuf_queue *q = &fh->vb_vidq;
1068
1069 dprintk(1, "%s\n", __FUNCTION__);
1070
1071 if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
1072 return POLLERR;
1073
1074 return videobuf_poll_stream(file, q, wait);
1075 }
1076
1077 static int vivi_close(struct inode *inode, struct file *file)
1078 {
1079 struct vivi_fh *fh = file->private_data;
1080 struct vivi_dev *dev = fh->dev;
1081 struct vivi_dmaqueue *vidq = &dev->vidq;
1082
1083 int minor = iminor(inode);
1084
1085 vivi_stop_thread(vidq);
1086 videobuf_stop(&fh->vb_vidq);
1087 videobuf_mmap_free(&fh->vb_vidq);
1088
1089 kfree(fh);
1090
1091 dev->users--;
1092
1093 dprintk(1, "close called (minor=%d, users=%d)\n", minor, dev->users);
1094
1095 return 0;
1096 }
1097
1098 static int vivi_release(void)
1099 {
1100 struct vivi_dev *dev;
1101 struct list_head *list;
1102
1103 while (!list_empty(&vivi_devlist)) {
1104 list = vivi_devlist.next;
1105 list_del(list);
1106 dev = list_entry(list, struct vivi_dev, vivi_devlist);
1107
1108 if (-1 != dev->vfd->minor)
1109 video_unregister_device(dev->vfd);
1110 else
1111 video_device_release(dev->vfd);
1112
1113 kfree(dev);
1114 }
1115
1116 return 0;
1117 }
1118
1119 static int vivi_mmap(struct file *file, struct vm_area_struct *vma)
1120 {
1121 struct vivi_fh *fh = file->private_data;
1122 int ret;
1123
1124 dprintk(1, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
1125
1126 ret = videobuf_mmap_mapper(&fh->vb_vidq, vma);
1127
1128 dprintk(1, "vma start=0x%08lx, size=%ld, ret=%d\n",
1129 (unsigned long)vma->vm_start,
1130 (unsigned long)vma->vm_end-(unsigned long)vma->vm_start,
1131 ret);
1132
1133 return ret;
1134 }
1135
1136 static const struct file_operations vivi_fops = {
1137 .owner = THIS_MODULE,
1138 .open = vivi_open,
1139 .release = vivi_close,
1140 .read = vivi_read,
1141 .poll = vivi_poll,
1142 .ioctl = video_ioctl2, /* V4L2 ioctl handler */
1143 .mmap = vivi_mmap,
1144 .llseek = no_llseek,
1145 };
1146
1147 static struct video_device vivi_template = {
1148 .name = "vivi",
1149 .type = VID_TYPE_CAPTURE,
1150 .fops = &vivi_fops,
1151 .minor = -1,
1152 .release = video_device_release,
1153
1154 .vidioc_querycap = vidioc_querycap,
1155 .vidioc_enum_fmt_cap = vidioc_enum_fmt_cap,
1156 .vidioc_g_fmt_cap = vidioc_g_fmt_cap,
1157 .vidioc_try_fmt_cap = vidioc_try_fmt_cap,
1158 .vidioc_s_fmt_cap = vidioc_s_fmt_cap,
1159 .vidioc_reqbufs = vidioc_reqbufs,
1160 .vidioc_querybuf = vidioc_querybuf,
1161 .vidioc_qbuf = vidioc_qbuf,
1162 .vidioc_dqbuf = vidioc_dqbuf,
1163 .vidioc_s_std = vidioc_s_std,
1164 .vidioc_enum_input = vidioc_enum_input,
1165 .vidioc_g_input = vidioc_g_input,
1166 .vidioc_s_input = vidioc_s_input,
1167 .vidioc_queryctrl = vidioc_queryctrl,
1168 .vidioc_g_ctrl = vidioc_g_ctrl,
1169 .vidioc_s_ctrl = vidioc_s_ctrl,
1170 .vidioc_streamon = vidioc_streamon,
1171 .vidioc_streamoff = vidioc_streamoff,
1172 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1173 .vidiocgmbuf = vidiocgmbuf,
1174 #endif
1175 .tvnorms = V4L2_STD_525_60,
1176 .current_norm = V4L2_STD_NTSC_M,
1177 };
1178 /* -----------------------------------------------------------------
1179 Initialization and module stuff
1180 ------------------------------------------------------------------*/
1181
1182 static int __init vivi_init(void)
1183 {
1184 int ret = -ENOMEM, i;
1185 struct vivi_dev *dev;
1186 struct video_device *vfd;
1187
1188 for (i = 0; i < n_devs; i++) {
1189 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1190 if (NULL == dev)
1191 break;
1192
1193 list_add_tail(&dev->vivi_devlist, &vivi_devlist);
1194
1195 /* init video dma queues */
1196 INIT_LIST_HEAD(&dev->vidq.active);
1197 INIT_LIST_HEAD(&dev->vidq.queued);
1198 init_waitqueue_head(&dev->vidq.wq);
1199
1200 /* initialize locks */
1201 mutex_init(&dev->lock);
1202
1203 dev->vidq.timeout.function = vivi_vid_timeout;
1204 dev->vidq.timeout.data = (unsigned long)dev;
1205 init_timer(&dev->vidq.timeout);
1206
1207 vfd = video_device_alloc();
1208 if (NULL == vfd)
1209 break;
1210
1211 *vfd = vivi_template;
1212
1213 ret = video_register_device(vfd, VFL_TYPE_GRABBER, video_nr);
1214 if (ret < 0)
1215 break;
1216
1217 snprintf(vfd->name, sizeof(vfd->name), "%s (%i)",
1218 vivi_template.name, vfd->minor);
1219
1220 if (video_nr >= 0)
1221 video_nr++;
1222
1223 dev->vfd = vfd;
1224 }
1225
1226 if (ret < 0) {
1227 vivi_release();
1228 printk(KERN_INFO "Error %d while loading vivi driver\n", ret);
1229 } else
1230 printk(KERN_INFO "Video Technology Magazine Virtual Video "
1231 "Capture Board successfully loaded.\n");
1232 return ret;
1233 }
1234
1235 static void __exit vivi_exit(void)
1236 {
1237 vivi_release();
1238 }
1239
1240 module_init(vivi_init);
1241 module_exit(vivi_exit);
1242
1243 MODULE_DESCRIPTION("Video Technology Magazine Virtual Video Capture Board");
1244 MODULE_AUTHOR("Mauro Carvalho Chehab, Ted Walther and John Sokol");
1245 MODULE_LICENSE("Dual BSD/GPL");
1246
1247 module_param(video_nr, int, 0);
1248 MODULE_PARM_DESC(video_nr, "video iminor start number");
1249
1250 module_param(n_devs, int, 0);
1251 MODULE_PARM_DESC(n_devs, "number of video devices to create");
1252
1253 module_param_named(debug, vivi.debug, int, 0644);
1254 MODULE_PARM_DESC(debug, "activates debug info");
1255
1256 module_param(vid_limit, int, 0644);
1257 MODULE_PARM_DESC(vid_limit, "capture memory limit in megabytes");
Linux kernel - Deliverables
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