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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / media / video / vivi.c
blob1db067c028157609c895b0124e72143acd94c8b2
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 struct list_head queued;
150 struct timer_list timeout;
151
152 /* thread for generating video stream*/
153 struct task_struct *kthread;
154 wait_queue_head_t wq;
155 /* Counters to control fps rate */
156 int frame;
157 int ini_jiffies;
158 };
159
160 static LIST_HEAD(vivi_devlist);
161
162 struct vivi_dev {
163 struct list_head vivi_devlist;
164
165 struct mutex lock;
166 spinlock_t slock;
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, ms;
177 unsigned long jiffies;
178 char timestr[13];
179
180 int mv_count; /* Controls bars movement */
181 };
182
183 struct vivi_fh {
184 struct vivi_dev *dev;
185
186 /* video capture */
187 struct vivi_fmt *fmt;
188 unsigned int width, height;
189 struct videobuf_queue vb_vidq;
190
191 enum v4l2_buf_type type;
192 };
193
194 /* ------------------------------------------------------------------
195 DMA and thread functions
196 ------------------------------------------------------------------*/
197
198 /* Bars and Colors should match positions */
199
200 enum colors {
201 WHITE,
202 AMBAR,
203 CYAN,
204 GREEN,
205 MAGENTA,
206 RED,
207 BLUE,
208 BLACK,
209 };
210
211 static u8 bars[8][3] = {
212 /* R G B */
213 {204, 204, 204}, /* white */
214 {208, 208, 0}, /* ambar */
215 { 0, 206, 206}, /* cyan */
216 { 0, 239, 0}, /* green */
217 {239, 0, 239}, /* magenta */
218 {205, 0, 0}, /* red */
219 { 0, 0, 255}, /* blue */
220 { 0, 0, 0}, /* black */
221 };
222
223 #define TO_Y(r, g, b) \
224 (((16829 * r + 33039 * g + 6416 * b + 32768) >> 16) + 16)
225 /* RGB to V(Cr) Color transform */
226 #define TO_V(r, g, b) \
227 (((28784 * r - 24103 * g - 4681 * b + 32768) >> 16) + 128)
228 /* RGB to U(Cb) Color transform */
229 #define TO_U(r, g, b) \
230 (((-9714 * r - 19070 * g + 28784 * b + 32768) >> 16) + 128)
231
232 #define TSTAMP_MIN_Y 24
233 #define TSTAMP_MAX_Y TSTAMP_MIN_Y+15
234 #define TSTAMP_MIN_X 64
235
236 static void gen_line(char *basep, int inipos, int wmax,
237 int hmax, int line, int count, char *timestr)
238 {
239 int w, i, j, y;
240 int pos = inipos;
241 char *p, *s;
242 u8 chr, r, g, b, color;
243
244 /* We will just duplicate the second pixel at the packet */
245 wmax /= 2;
246
247 /* Generate a standard color bar pattern */
248 for (w = 0; w < wmax; w++) {
249 int colorpos = ((w + count) * 8/(wmax + 1)) % 8;
250 r = bars[colorpos][0];
251 g = bars[colorpos][1];
252 b = bars[colorpos][2];
253
254 for (color = 0; color < 4; color++) {
255 p = basep + pos;
256
257 switch (color) {
258 case 0:
259 case 2:
260 *p = TO_Y(r, g, b); /* Luma */
261 break;
262 case 1:
263 *p = TO_U(r, g, b); /* Cb */
264 break;
265 case 3:
266 *p = TO_V(r, g, b); /* Cr */
267 break;
268 }
269 pos++;
270 }
271 }
272
273 /* Checks if it is possible to show timestamp */
274 if (TSTAMP_MAX_Y >= hmax)
275 goto end;
276 if (TSTAMP_MIN_X + strlen(timestr) >= wmax)
277 goto end;
278
279 /* Print stream time */
280 if (line >= TSTAMP_MIN_Y && line <= TSTAMP_MAX_Y) {
281 j = TSTAMP_MIN_X;
282 for (s = timestr; *s; s++) {
283 chr = rom8x16_bits[(*s-0x30)*16+line-TSTAMP_MIN_Y];
284 for (i = 0; i < 7; i++) {
285 if (chr & 1 << (7 - i)) {
286 /* Font color*/
287 r = 0;
288 g = 198;
289 b = 0;
290 } else {
291 /* Background color */
292 r = bars[BLACK][0];
293 g = bars[BLACK][1];
294 b = bars[BLACK][2];
295 }
296
297 pos = inipos + j * 2;
298 for (color = 0; color < 4; color++) {
299 p = basep + pos;
300
301 y = TO_Y(r, g, b);
302
303 switch (color) {
304 case 0:
305 case 2:
306 *p = TO_Y(r, g, b); /* Luma */
307 break;
308 case 1:
309 *p = TO_U(r, g, b); /* Cb */
310 break;
311 case 3:
312 *p = TO_V(r, g, b); /* Cr */
313 break;
314 }
315 pos++;
316 }
317 j++;
318 }
319 }
320 }
321
322 end:
323 return;
324 }
325 static void vivi_fillbuff(struct vivi_dev *dev, struct vivi_buffer *buf)
326 {
327 int h , pos = 0;
328 int hmax = buf->vb.height;
329 int wmax = buf->vb.width;
330 struct timeval ts;
331 char *tmpbuf = kmalloc(wmax * 2, GFP_KERNEL);
332 void *vbuf = videobuf_to_vmalloc(&buf->vb);
333
334 if (!tmpbuf)
335 return;
336
337 for (h = 0; h < hmax; h++) {
338 gen_line(tmpbuf, 0, wmax, hmax, h, dev->mv_count,
339 dev->timestr);
340 /* FIXME: replacing to __copy_to_user */
341 if (copy_to_user(vbuf + pos, tmpbuf, wmax * 2) != 0)
342 dprintk(dev, 2, "vivifill copy_to_user failed.\n");
343 pos += wmax*2;
344 }
345
346 dev->mv_count++;
347
348 kfree(tmpbuf);
349
350 /* Updates stream time */
351
352 dev->ms += jiffies_to_msecs(jiffies-dev->jiffies);
353 dev->jiffies = jiffies;
354 if (dev->ms >= 1000) {
355 dev->ms -= 1000;
356 dev->s++;
357 if (dev->s >= 60) {
358 dev->s -= 60;
359 dev->m++;
360 if (dev->m > 60) {
361 dev->m -= 60;
362 dev->h++;
363 if (dev->h > 24)
364 dev->h -= 24;
365 }
366 }
367 }
368 sprintf(dev->timestr, "%02d:%02d:%02d:%03d",
369 dev->h, dev->m, dev->s, dev->ms);
370
371 dprintk(dev, 2, "vivifill at %s: Buffer 0x%08lx size= %d\n",
372 dev->timestr, (unsigned long)tmpbuf, pos);
373
374 /* Advice that buffer was filled */
375 buf->vb.state = VIDEOBUF_DONE;
376 buf->vb.field_count++;
377 do_gettimeofday(&ts);
378 buf->vb.ts = ts;
379
380 list_del(&buf->vb.queue);
381 wake_up(&buf->vb.done);
382 }
383
384 static int restart_video_queue(struct vivi_dmaqueue *dma_q);
385
386 static void vivi_thread_tick(struct vivi_dmaqueue *dma_q)
387 {
388 struct vivi_buffer *buf;
389 struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
390
391 int bc;
392
393 spin_lock(&dev->slock);
394 /* Announces videobuf that all went ok */
395 for (bc = 0;; bc++) {
396 if (list_empty(&dma_q->active)) {
397 dprintk(dev, 1, "No active queue to serve\n");
398 break;
399 }
400
401 buf = list_entry(dma_q->active.next,
402 struct vivi_buffer, vb.queue);
403
404 /* Nobody is waiting something to be done, just return */
405 if (!waitqueue_active(&buf->vb.done)) {
406 mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
407 spin_unlock(&dev->slock);
408 return;
409 }
410
411 do_gettimeofday(&buf->vb.ts);
412 dprintk(dev, 2, "[%p/%d] wakeup\n", buf, buf->vb. i);
413
414 /* Fill buffer */
415 vivi_fillbuff(dev, buf);
416
417 if (list_empty(&dma_q->active)) {
418 del_timer(&dma_q->timeout);
419 } else {
420 mod_timer(&dma_q->timeout, jiffies + BUFFER_TIMEOUT);
421 }
422 }
423 if (bc != 1)
424 dprintk(dev, 1, "%s: %d buffers handled (should be 1)\n",
425 __FUNCTION__, bc);
426 spin_unlock(&dev->slock);
427 }
428
429 #define frames_to_ms(frames) \
430 ((frames * WAKE_NUMERATOR * 1000) / WAKE_DENOMINATOR)
431
432 static void vivi_sleep(struct vivi_dmaqueue *dma_q)
433 {
434 struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
435 int timeout, running_time;
436 DECLARE_WAITQUEUE(wait, current);
437
438 dprintk(dev, 1, "%s dma_q=0x%08lx\n", __FUNCTION__,
439 (unsigned long)dma_q);
440
441 add_wait_queue(&dma_q->wq, &wait);
442 if (kthread_should_stop())
443 goto stop_task;
444
445 running_time = jiffies - dma_q->ini_jiffies;
446 dma_q->frame++;
447
448 /* Calculate time to wake up */
449 timeout = msecs_to_jiffies(frames_to_ms(dma_q->frame)) - running_time;
450
451 if (timeout > msecs_to_jiffies(frames_to_ms(2)) || timeout <= 0) {
452 int old = dma_q->frame;
453 int nframes;
454
455 dma_q->frame = (jiffies_to_msecs(running_time) /
456 frames_to_ms(1)) + 1;
457
458 timeout = msecs_to_jiffies(frames_to_ms(dma_q->frame))
459 - running_time;
460
461 if (unlikely (timeout <= 0))
462 timeout = 1;
463
464 nframes = (dma_q->frame > old)?
465 dma_q->frame - old : old - dma_q->frame;
466
467 dprintk(dev, 1, "%ld: %s %d frames. "
468 "Current frame is %d. Will sleep for %d jiffies\n",
469 jiffies,
470 (dma_q->frame > old)? "Underrun, losed" : "Overrun of",
471 nframes, dma_q->frame, timeout);
472 } else
473 dprintk(dev, 1, "will sleep for %d jiffies\n", timeout);
474
475 vivi_thread_tick(dma_q);
476
477 schedule_timeout_interruptible(timeout);
478
479 stop_task:
480 remove_wait_queue(&dma_q->wq, &wait);
481 try_to_freeze();
482 }
483
484 static int vivi_thread(void *data)
485 {
486 struct vivi_dmaqueue *dma_q = data;
487 struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
488
489 dprintk(dev, 1, "thread started\n");
490
491 mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
492 set_freezable();
493
494 for (;;) {
495 vivi_sleep(dma_q);
496
497 if (kthread_should_stop())
498 break;
499 }
500 dprintk(dev, 1, "thread: exit\n");
501 return 0;
502 }
503
504 static int vivi_start_thread(struct vivi_dmaqueue *dma_q)
505 {
506 struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
507
508 dma_q->frame = 0;
509 dma_q->ini_jiffies = jiffies;
510
511 dprintk(dev, 1, "%s\n", __FUNCTION__);
512
513 dma_q->kthread = kthread_run(vivi_thread, dma_q, "vivi");
514
515 if (IS_ERR(dma_q->kthread)) {
516 printk(KERN_ERR "vivi: kernel_thread() failed\n");
517 return PTR_ERR(dma_q->kthread);
518 }
519 /* Wakes thread */
520 wake_up_interruptible(&dma_q->wq);
521
522 dprintk(dev, 1, "returning from %s\n", __FUNCTION__);
523 return 0;
524 }
525
526 static void vivi_stop_thread(struct vivi_dmaqueue *dma_q)
527 {
528 struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
529
530 dprintk(dev, 1, "%s\n", __FUNCTION__);
531 /* shutdown control thread */
532 if (dma_q->kthread) {
533 kthread_stop(dma_q->kthread);
534 dma_q->kthread = NULL;
535 }
536 }
537
538 static int restart_video_queue(struct vivi_dmaqueue *dma_q)
539 {
540 struct vivi_dev *dev = container_of(dma_q, struct vivi_dev, vidq);
541 struct vivi_buffer *buf, *prev;
542
543 dprintk(dev, 1, "%s dma_q=0x%08lx\n", __FUNCTION__,
544 (unsigned long)dma_q);
545
546 if (!list_empty(&dma_q->active)) {
547 buf = list_entry(dma_q->active.next,
548 struct vivi_buffer, vb.queue);
549 dprintk(dev, 2, "restart_queue [%p/%d]: restart dma\n",
550 buf, buf->vb.i);
551
552 dprintk(dev, 1, "Restarting video dma\n");
553 vivi_stop_thread(dma_q);
554
555 /* cancel all outstanding capture / vbi requests */
556 list_for_each_entry_safe(buf, prev, &dma_q->active, vb.queue) {
557 list_del(&buf->vb.queue);
558 buf->vb.state = VIDEOBUF_ERROR;
559 wake_up(&buf->vb.done);
560 }
561 mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
562
563 return 0;
564 }
565
566 prev = NULL;
567 for (;;) {
568 if (list_empty(&dma_q->queued))
569 return 0;
570 buf = list_entry(dma_q->queued.next,
571 struct vivi_buffer, vb.queue);
572 if (NULL == prev) {
573 list_del(&buf->vb.queue);
574 list_add_tail(&buf->vb.queue, &dma_q->active);
575
576 dprintk(dev, 1, "Restarting video dma\n");
577 vivi_stop_thread(dma_q);
578 vivi_start_thread(dma_q);
579
580 buf->vb.state = VIDEOBUF_ACTIVE;
581 mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
582 dprintk(dev, 2,
583 "[%p/%d] restart_queue - first active\n",
584 buf, buf->vb.i);
585
586 } else if (prev->vb.width == buf->vb.width &&
587 prev->vb.height == buf->vb.height &&
588 prev->fmt == buf->fmt) {
589 list_del(&buf->vb.queue);
590 list_add_tail(&buf->vb.queue, &dma_q->active);
591 buf->vb.state = VIDEOBUF_ACTIVE;
592 dprintk(dev, 2,
593 "[%p/%d] restart_queue - move to active\n",
594 buf, buf->vb.i);
595 } else {
596 return 0;
597 }
598 prev = buf;
599 }
600 }
601
602 static void vivi_vid_timeout(unsigned long data)
603 {
604 struct vivi_dev *dev = (struct vivi_dev *)data;
605 struct vivi_dmaqueue *vidq = &dev->vidq;
606 struct vivi_buffer *buf;
607
608 spin_lock(&dev->slock);
609
610 while (!list_empty(&vidq->active)) {
611 buf = list_entry(vidq->active.next,
612 struct vivi_buffer, vb.queue);
613 list_del(&buf->vb.queue);
614 buf->vb.state = VIDEOBUF_ERROR;
615 wake_up(&buf->vb.done);
616 printk(KERN_INFO "vivi/0: [%p/%d] timeout\n", buf, buf->vb.i);
617 }
618 restart_video_queue(vidq);
619
620 spin_unlock(&dev->slock);
621 }
622
623 /* ------------------------------------------------------------------
624 Videobuf operations
625 ------------------------------------------------------------------*/
626 static int
627 buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
628 {
629 struct vivi_fh *fh = vq->priv_data;
630 struct vivi_dev *dev = fh->dev;
631
632 *size = fh->width*fh->height*2;
633
634 if (0 == *count)
635 *count = 32;
636
637 while (*size * *count > vid_limit * 1024 * 1024)
638 (*count)--;
639
640 dprintk(dev, 1, "%s, count=%d, size=%d\n", __FUNCTION__,
641 *count, *size);
642
643 return 0;
644 }
645
646 static void free_buffer(struct videobuf_queue *vq, struct vivi_buffer *buf)
647 {
648 struct vivi_fh *fh = vq->priv_data;
649 struct vivi_dev *dev = fh->dev;
650
651 dprintk(dev, 1, "%s\n", __FUNCTION__);
652
653 if (in_interrupt())
654 BUG();
655
656 videobuf_waiton(&buf->vb, 0, 0);
657 videobuf_vmalloc_free(&buf->vb);
658 buf->vb.state = VIDEOBUF_NEEDS_INIT;
659 }
660
661 #define norm_maxw() 1024
662 #define norm_maxh() 768
663 static int
664 buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
665 enum v4l2_field field)
666 {
667 struct vivi_fh *fh = vq->priv_data;
668 struct vivi_dev *dev = fh->dev;
669 struct vivi_buffer *buf = container_of(vb, struct vivi_buffer, vb);
670 int rc, init_buffer = 0;
671
672 dprintk(dev, 1, "%s, field=%d\n", __FUNCTION__, field);
673
674 BUG_ON(NULL == fh->fmt);
675 if (fh->width < 48 || fh->width > norm_maxw() ||
676 fh->height < 32 || fh->height > norm_maxh())
677 return -EINVAL;
678 buf->vb.size = fh->width*fh->height*2;
679 if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
680 return -EINVAL;
681
682 if (buf->fmt != fh->fmt ||
683 buf->vb.width != fh->width ||
684 buf->vb.height != fh->height ||
685 buf->vb.field != field) {
686 buf->fmt = fh->fmt;
687 buf->vb.width = fh->width;
688 buf->vb.height = fh->height;
689 buf->vb.field = field;
690 init_buffer = 1;
691 }
692
693 if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
694 rc = videobuf_iolock(vq, &buf->vb, NULL);
695 if (rc < 0)
696 goto fail;
697 }
698
699 buf->vb.state = VIDEOBUF_PREPARED;
700
701 return 0;
702
703 fail:
704 free_buffer(vq, buf);
705 return rc;
706 }
707
708 static void
709 buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
710 {
711 struct vivi_buffer *buf = container_of(vb, struct vivi_buffer, vb);
712 struct vivi_fh *fh = vq->priv_data;
713 struct vivi_dev *dev = fh->dev;
714 struct vivi_dmaqueue *vidq = &dev->vidq;
715 struct vivi_buffer *prev;
716
717 if (!list_empty(&vidq->queued)) {
718 dprintk(dev, 1, "adding vb queue=0x%08lx\n",
719 (unsigned long)&buf->vb.queue);
720 list_add_tail(&buf->vb.queue, &vidq->queued);
721 buf->vb.state = VIDEOBUF_QUEUED;
722 dprintk(dev, 2, "[%p/%d] buffer_queue - append to queued\n",
723 buf, buf->vb.i);
724 } else if (list_empty(&vidq->active)) {
725 list_add_tail(&buf->vb.queue, &vidq->active);
726
727 buf->vb.state = VIDEOBUF_ACTIVE;
728 mod_timer(&vidq->timeout, jiffies+BUFFER_TIMEOUT);
729 dprintk(dev, 2, "[%p/%d] buffer_queue - first active\n",
730 buf, buf->vb.i);
731
732 vivi_start_thread(vidq);
733 } else {
734 prev = list_entry(vidq->active.prev,
735 struct vivi_buffer, vb.queue);
736 if (prev->vb.width == buf->vb.width &&
737 prev->vb.height == buf->vb.height &&
738 prev->fmt == buf->fmt) {
739 list_add_tail(&buf->vb.queue, &vidq->active);
740 buf->vb.state = VIDEOBUF_ACTIVE;
741 dprintk(dev, 2,
742 "[%p/%d] buffer_queue - append to active\n",
743 buf, buf->vb.i);
744
745 } else {
746 list_add_tail(&buf->vb.queue, &vidq->queued);
747 buf->vb.state = VIDEOBUF_QUEUED;
748 dprintk(dev, 2,
749 "[%p/%d] buffer_queue - first queued\n",
750 buf, buf->vb.i);
751 }
752 }
753 }
754
755 static void buffer_release(struct videobuf_queue *vq,
756 struct videobuf_buffer *vb)
757 {
758 struct vivi_buffer *buf = container_of(vb, struct vivi_buffer, vb);
759 struct vivi_fh *fh = vq->priv_data;
760 struct vivi_dev *dev = (struct vivi_dev *)fh->dev;
761 struct vivi_dmaqueue *vidq = &dev->vidq;
762
763 dprintk(dev, 1, "%s\n", __FUNCTION__);
764
765 vivi_stop_thread(vidq);
766
767 free_buffer(vq, buf);
768 }
769
770 static struct videobuf_queue_ops vivi_video_qops = {
771 .buf_setup = buffer_setup,
772 .buf_prepare = buffer_prepare,
773 .buf_queue = buffer_queue,
774 .buf_release = buffer_release,
775 };
776
777 /* ------------------------------------------------------------------
778 IOCTL vidioc handling
779 ------------------------------------------------------------------*/
780 static int vidioc_querycap(struct file *file, void *priv,
781 struct v4l2_capability *cap)
782 {
783 strcpy(cap->driver, "vivi");
784 strcpy(cap->card, "vivi");
785 cap->version = VIVI_VERSION;
786 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE |
787 V4L2_CAP_STREAMING |
788 V4L2_CAP_READWRITE;
789 return 0;
790 }
791
792 static int vidioc_enum_fmt_cap(struct file *file, void *priv,
793 struct v4l2_fmtdesc *f)
794 {
795 if (f->index > 0)
796 return -EINVAL;
797
798 strlcpy(f->description, format.name, sizeof(f->description));
799 f->pixelformat = format.fourcc;
800 return 0;
801 }
802
803 static int vidioc_g_fmt_cap(struct file *file, void *priv,
804 struct v4l2_format *f)
805 {
806 struct vivi_fh *fh = priv;
807
808 f->fmt.pix.width = fh->width;
809 f->fmt.pix.height = fh->height;
810 f->fmt.pix.field = fh->vb_vidq.field;
811 f->fmt.pix.pixelformat = fh->fmt->fourcc;
812 f->fmt.pix.bytesperline =
813 (f->fmt.pix.width * fh->fmt->depth) >> 3;
814 f->fmt.pix.sizeimage =
815 f->fmt.pix.height * f->fmt.pix.bytesperline;
816
817 return (0);
818 }
819
820 static int vidioc_try_fmt_cap(struct file *file, void *priv,
821 struct v4l2_format *f)
822 {
823 struct vivi_fh *fh = priv;
824 struct vivi_dev *dev = fh->dev;
825 struct vivi_fmt *fmt;
826 enum v4l2_field field;
827 unsigned int maxw, maxh;
828
829 if (format.fourcc != f->fmt.pix.pixelformat) {
830 dprintk(dev, 1, "Fourcc format (0x%08x) invalid. "
831 "Driver accepts only 0x%08x\n",
832 f->fmt.pix.pixelformat, format.fourcc);
833 return -EINVAL;
834 }
835 fmt = &format;
836
837 field = f->fmt.pix.field;
838
839 if (field == V4L2_FIELD_ANY) {
840 field = V4L2_FIELD_INTERLACED;
841 } else if (V4L2_FIELD_INTERLACED != field) {
842 dprintk(dev, 1, "Field type invalid.\n");
843 return -EINVAL;
844 }
845
846 maxw = norm_maxw();
847 maxh = norm_maxh();
848
849 f->fmt.pix.field = field;
850 if (f->fmt.pix.height < 32)
851 f->fmt.pix.height = 32;
852 if (f->fmt.pix.height > maxh)
853 f->fmt.pix.height = maxh;
854 if (f->fmt.pix.width < 48)
855 f->fmt.pix.width = 48;
856 if (f->fmt.pix.width > maxw)
857 f->fmt.pix.width = maxw;
858 f->fmt.pix.width &= ~0x03;
859 f->fmt.pix.bytesperline =
860 (f->fmt.pix.width * fmt->depth) >> 3;
861 f->fmt.pix.sizeimage =
862 f->fmt.pix.height * f->fmt.pix.bytesperline;
863
864 return 0;
865 }
866
867 /*FIXME: This seems to be generic enough to be at videodev2 */
868 static int vidioc_s_fmt_cap(struct file *file, void *priv,
869 struct v4l2_format *f)
870 {
871 struct vivi_fh *fh = priv;
872 int ret = vidioc_try_fmt_cap(file, fh, f);
873 if (ret < 0)
874 return (ret);
875
876 fh->fmt = &format;
877 fh->width = f->fmt.pix.width;
878 fh->height = f->fmt.pix.height;
879 fh->vb_vidq.field = f->fmt.pix.field;
880 fh->type = f->type;
881
882 return (0);
883 }
884
885 static int vidioc_reqbufs(struct file *file, void *priv,
886 struct v4l2_requestbuffers *p)
887 {
888 struct vivi_fh *fh = priv;
889
890 return (videobuf_reqbufs(&fh->vb_vidq, p));
891 }
892
893 static int vidioc_querybuf(struct file *file, void *priv, struct v4l2_buffer *p)
894 {
895 struct vivi_fh *fh = priv;
896
897 return (videobuf_querybuf(&fh->vb_vidq, p));
898 }
899
900 static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)
901 {
902 struct vivi_fh *fh = priv;
903
904 return (videobuf_qbuf(&fh->vb_vidq, p));
905 }
906
907 static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
908 {
909 struct vivi_fh *fh = priv;
910
911 return (videobuf_dqbuf(&fh->vb_vidq, p,
912 file->f_flags & O_NONBLOCK));
913 }
914
915 #ifdef CONFIG_VIDEO_V4L1_COMPAT
916 static int vidiocgmbuf(struct file *file, void *priv, struct video_mbuf *mbuf)
917 {
918 struct vivi_fh *fh = priv;
919
920 return videobuf_cgmbuf(&fh->vb_vidq, mbuf, 8);
921 }
922 #endif
923
924 static int vidioc_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
925 {
926 struct vivi_fh *fh = priv;
927
928 if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
929 return -EINVAL;
930 if (i != fh->type)
931 return -EINVAL;
932
933 return videobuf_streamon(&fh->vb_vidq);
934 }
935
936 static int vidioc_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
937 {
938 struct vivi_fh *fh = priv;
939
940 if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
941 return -EINVAL;
942 if (i != fh->type)
943 return -EINVAL;
944
945 return videobuf_streamoff(&fh->vb_vidq);
946 }
947
948 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *i)
949 {
950 return 0;
951 }
952
953 /* only one input in this sample driver */
954 static int vidioc_enum_input(struct file *file, void *priv,
955 struct v4l2_input *inp)
956 {
957 if (inp->index != 0)
958 return -EINVAL;
959
960 inp->type = V4L2_INPUT_TYPE_CAMERA;
961 inp->std = V4L2_STD_525_60;
962 strcpy(inp->name, "Camera");
963
964 return (0);
965 }
966
967 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
968 {
969 *i = 0;
970
971 return (0);
972 }
973 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
974 {
975 if (i > 0)
976 return -EINVAL;
977
978 return (0);
979 }
980
981 /* --- controls ---------------------------------------------- */
982 static int vidioc_queryctrl(struct file *file, void *priv,
983 struct v4l2_queryctrl *qc)
984 {
985 int i;
986
987 for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
988 if (qc->id && qc->id == vivi_qctrl[i].id) {
989 memcpy(qc, &(vivi_qctrl[i]),
990 sizeof(*qc));
991 return (0);
992 }
993
994 return -EINVAL;
995 }
996
997 static int vidioc_g_ctrl(struct file *file, void *priv,
998 struct v4l2_control *ctrl)
999 {
1000 int i;
1001
1002 for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1003 if (ctrl->id == vivi_qctrl[i].id) {
1004 ctrl->value = qctl_regs[i];
1005 return (0);
1006 }
1007
1008 return -EINVAL;
1009 }
1010 static int vidioc_s_ctrl(struct file *file, void *priv,
1011 struct v4l2_control *ctrl)
1012 {
1013 int i;
1014
1015 for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1016 if (ctrl->id == vivi_qctrl[i].id) {
1017 if (ctrl->value < vivi_qctrl[i].minimum
1018 || ctrl->value > vivi_qctrl[i].maximum) {
1019 return (-ERANGE);
1020 }
1021 qctl_regs[i] = ctrl->value;
1022 return (0);
1023 }
1024 return -EINVAL;
1025 }
1026
1027 /* ------------------------------------------------------------------
1028 File operations for the device
1029 ------------------------------------------------------------------*/
1030
1031 #define line_buf_size(norm) (norm_maxw(norm)*(format.depth+7)/8)
1032
1033 static int vivi_open(struct inode *inode, struct file *file)
1034 {
1035 int minor = iminor(inode);
1036 struct vivi_dev *dev;
1037 struct vivi_fh *fh;
1038 int i;
1039
1040 printk(KERN_DEBUG "vivi: open called (minor=%d)\n", minor);
1041
1042 list_for_each_entry(dev, &vivi_devlist, vivi_devlist)
1043 if (dev->vfd->minor == minor)
1044 goto found;
1045 return -ENODEV;
1046
1047 found:
1048 /* If more than one user, mutex should be added */
1049 dev->users++;
1050
1051 dprintk(dev, 1, "open minor=%d type=%s users=%d\n", minor,
1052 v4l2_type_names[V4L2_BUF_TYPE_VIDEO_CAPTURE], dev->users);
1053
1054 /* allocate + initialize per filehandle data */
1055 fh = kzalloc(sizeof(*fh), GFP_KERNEL);
1056 if (NULL == fh) {
1057 dev->users--;
1058 return -ENOMEM;
1059 }
1060
1061 file->private_data = fh;
1062 fh->dev = dev;
1063
1064 fh->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1065 fh->fmt = &format;
1066 fh->width = 640;
1067 fh->height = 480;
1068
1069 /* Put all controls at a sane state */
1070 for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1071 qctl_regs[i] = vivi_qctrl[i].default_value;
1072
1073 /* Resets frame counters */
1074 dev->h = 0;
1075 dev->m = 0;
1076 dev->s = 0;
1077 dev->ms = 0;
1078 dev->mv_count = 0;
1079 dev->jiffies = jiffies;
1080 sprintf(dev->timestr, "%02d:%02d:%02d:%03d",
1081 dev->h, dev->m, dev->s, dev->ms);
1082
1083 videobuf_queue_vmalloc_init(&fh->vb_vidq, &vivi_video_qops,
1084 NULL, &dev->slock, fh->type, V4L2_FIELD_INTERLACED,
1085 sizeof(struct vivi_buffer), fh);
1086
1087 return 0;
1088 }
1089
1090 static ssize_t
1091 vivi_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
1092 {
1093 struct vivi_fh *fh = file->private_data;
1094
1095 if (fh->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
1096 return videobuf_read_stream(&fh->vb_vidq, data, count, ppos, 0,
1097 file->f_flags & O_NONBLOCK);
1098 }
1099 return 0;
1100 }
1101
1102 static unsigned int
1103 vivi_poll(struct file *file, struct poll_table_struct *wait)
1104 {
1105 struct vivi_fh *fh = file->private_data;
1106 struct vivi_dev *dev = fh->dev;
1107 struct videobuf_queue *q = &fh->vb_vidq;
1108
1109 dprintk(dev, 1, "%s\n", __FUNCTION__);
1110
1111 if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
1112 return POLLERR;
1113
1114 return videobuf_poll_stream(file, q, wait);
1115 }
1116
1117 static int vivi_close(struct inode *inode, struct file *file)
1118 {
1119 struct vivi_fh *fh = file->private_data;
1120 struct vivi_dev *dev = fh->dev;
1121 struct vivi_dmaqueue *vidq = &dev->vidq;
1122
1123 int minor = iminor(inode);
1124
1125 vivi_stop_thread(vidq);
1126 videobuf_stop(&fh->vb_vidq);
1127 videobuf_mmap_free(&fh->vb_vidq);
1128
1129 kfree(fh);
1130
1131 dev->users--;
1132
1133 dprintk(dev, 1, "close called (minor=%d, users=%d)\n",
1134 minor, dev->users);
1135
1136 return 0;
1137 }
1138
1139 static int vivi_release(void)
1140 {
1141 struct vivi_dev *dev;
1142 struct list_head *list;
1143
1144 while (!list_empty(&vivi_devlist)) {
1145 list = vivi_devlist.next;
1146 list_del(list);
1147 dev = list_entry(list, struct vivi_dev, vivi_devlist);
1148
1149 if (-1 != dev->vfd->minor)
1150 video_unregister_device(dev->vfd);
1151 else
1152 video_device_release(dev->vfd);
1153
1154 kfree(dev);
1155 }
1156
1157 return 0;
1158 }
1159
1160 static int vivi_mmap(struct file *file, struct vm_area_struct *vma)
1161 {
1162 struct vivi_fh *fh = file->private_data;
1163 struct vivi_dev *dev = fh->dev;
1164 int ret;
1165
1166 dprintk(dev, 1, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
1167
1168 ret = videobuf_mmap_mapper(&fh->vb_vidq, vma);
1169
1170 dprintk(dev, 1, "vma start=0x%08lx, size=%ld, ret=%d\n",
1171 (unsigned long)vma->vm_start,
1172 (unsigned long)vma->vm_end-(unsigned long)vma->vm_start,
1173 ret);
1174
1175 return ret;
1176 }
1177
1178 static const struct file_operations vivi_fops = {
1179 .owner = THIS_MODULE,
1180 .open = vivi_open,
1181 .release = vivi_close,
1182 .read = vivi_read,
1183 .poll = vivi_poll,
1184 .ioctl = video_ioctl2, /* V4L2 ioctl handler */
1185 .mmap = vivi_mmap,
1186 .llseek = no_llseek,
1187 };
1188
1189 static struct video_device vivi_template = {
1190 .name = "vivi",
1191 .type = VID_TYPE_CAPTURE,
1192 .fops = &vivi_fops,
1193 .minor = -1,
1194 .release = video_device_release,
1195
1196 .vidioc_querycap = vidioc_querycap,
1197 .vidioc_enum_fmt_cap = vidioc_enum_fmt_cap,
1198 .vidioc_g_fmt_cap = vidioc_g_fmt_cap,
1199 .vidioc_try_fmt_cap = vidioc_try_fmt_cap,
1200 .vidioc_s_fmt_cap = vidioc_s_fmt_cap,
1201 .vidioc_reqbufs = vidioc_reqbufs,
1202 .vidioc_querybuf = vidioc_querybuf,
1203 .vidioc_qbuf = vidioc_qbuf,
1204 .vidioc_dqbuf = vidioc_dqbuf,
1205 .vidioc_s_std = vidioc_s_std,
1206 .vidioc_enum_input = vidioc_enum_input,
1207 .vidioc_g_input = vidioc_g_input,
1208 .vidioc_s_input = vidioc_s_input,
1209 .vidioc_queryctrl = vidioc_queryctrl,
1210 .vidioc_g_ctrl = vidioc_g_ctrl,
1211 .vidioc_s_ctrl = vidioc_s_ctrl,
1212 .vidioc_streamon = vidioc_streamon,
1213 .vidioc_streamoff = vidioc_streamoff,
1214 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1215 .vidiocgmbuf = vidiocgmbuf,
1216 #endif
1217 .tvnorms = V4L2_STD_525_60,
1218 .current_norm = V4L2_STD_NTSC_M,
1219 };
1220 /* -----------------------------------------------------------------
1221 Initialization and module stuff
1222 ------------------------------------------------------------------*/
1223
1224 static int __init vivi_init(void)
1225 {
1226 int ret = -ENOMEM, i;
1227 struct vivi_dev *dev;
1228 struct video_device *vfd;
1229
1230 for (i = 0; i < n_devs; i++) {
1231 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1232 if (NULL == dev)
1233 break;
1234
1235 list_add_tail(&dev->vivi_devlist, &vivi_devlist);
1236
1237 /* init video dma queues */
1238 INIT_LIST_HEAD(&dev->vidq.active);
1239 INIT_LIST_HEAD(&dev->vidq.queued);
1240 init_waitqueue_head(&dev->vidq.wq);
1241
1242 /* initialize locks */
1243 mutex_init(&dev->lock);
1244 spin_lock_init(&dev->slock);
1245
1246 dev->vidq.timeout.function = vivi_vid_timeout;
1247 dev->vidq.timeout.data = (unsigned long)dev;
1248 init_timer(&dev->vidq.timeout);
1249
1250 vfd = video_device_alloc();
1251 if (NULL == vfd)
1252 break;
1253
1254 *vfd = vivi_template;
1255
1256 ret = video_register_device(vfd, VFL_TYPE_GRABBER, video_nr);
1257 if (ret < 0)
1258 break;
1259
1260 snprintf(vfd->name, sizeof(vfd->name), "%s (%i)",
1261 vivi_template.name, vfd->minor);
1262
1263 if (video_nr >= 0)
1264 video_nr++;
1265
1266 dev->vfd = vfd;
1267 }
1268
1269 if (ret < 0) {
1270 vivi_release();
1271 printk(KERN_INFO "Error %d while loading vivi driver\n", ret);
1272 } else
1273 printk(KERN_INFO "Video Technology Magazine Virtual Video "
1274 "Capture Board successfully loaded.\n");
1275 return ret;
1276 }
1277
1278 static void __exit vivi_exit(void)
1279 {
1280 vivi_release();
1281 }
1282
1283 module_init(vivi_init);
1284 module_exit(vivi_exit);
1285
1286 MODULE_DESCRIPTION("Video Technology Magazine Virtual Video Capture Board");
1287 MODULE_AUTHOR("Mauro Carvalho Chehab, Ted Walther and John Sokol");
1288 MODULE_LICENSE("Dual BSD/GPL");
1289
1290 module_param(video_nr, int, 0);
1291 MODULE_PARM_DESC(video_nr, "video iminor start number");
1292
1293 module_param(n_devs, int, 0);
1294 MODULE_PARM_DESC(n_devs, "number of video devices to create");
1295
1296 module_param_named(debug, vivi_template.debug, int, 0444);
1297 MODULE_PARM_DESC(debug, "activates debug info");
1298
1299 module_param(vid_limit, int, 0644);
1300 MODULE_PARM_DESC(vid_limit, "capture memory limit in megabytes");
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