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V4L/DVB (3931): Vivi.c: possible cleanups
[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/videodev2.h>
29 #include <linux/dma-mapping.h>
30 #ifdef CONFIG_VIDEO_V4L1_COMPAT
31 /* Include V4L1 specific functions. Should be removed soon */
32 #include <linux/videodev.h>
33 #endif
34 #include <linux/interrupt.h>
35 #include <media/video-buf.h>
36 #include <media/v4l2-common.h>
37 #include <linux/kthread.h>
38 #include <linux/highmem.h>
39
40 /* Wake up at about 30 fps */
41 #define WAKE_NUMERATOR 30
42 #define WAKE_DENOMINATOR 1001
43 #define BUFFER_TIMEOUT msecs_to_jiffies(500) /* 0.5 seconds */
44
45 /* These timers are for 1 fps - used only for testing */
46 //#define WAKE_DENOMINATOR 30 /* hack for testing purposes */
47 //#define BUFFER_TIMEOUT msecs_to_jiffies(5000) /* 5 seconds */
48
49 #include "font.h"
50
51 MODULE_DESCRIPTION("Video Technology Magazine Virtual Video Capture Board");
52 MODULE_AUTHOR("Mauro Carvalho Chehab, Ted Walther and John Sokol");
53 MODULE_LICENSE("Dual BSD/GPL");
54
55 #define VIVI_MAJOR_VERSION 0
56 #define VIVI_MINOR_VERSION 4
57 #define VIVI_RELEASE 0
58 #define VIVI_VERSION KERNEL_VERSION(VIVI_MAJOR_VERSION, VIVI_MINOR_VERSION, VIVI_RELEASE)
59
60 static int video_nr = -1; /* /dev/videoN, -1 for autodetect */
61 module_param(video_nr, int, 0);
62
63 static int debug = 0;
64 module_param(debug, int, 0);
65
66 static unsigned int vid_limit = 16;
67 module_param(vid_limit,int,0644);
68 MODULE_PARM_DESC(vid_limit,"capture memory limit in megabytes");
69
70 /* supported controls */
71 static struct v4l2_queryctrl vivi_qctrl[] = {
72 {
73 .id = V4L2_CID_AUDIO_VOLUME,
74 .name = "Volume",
75 .minimum = 0,
76 .maximum = 65535,
77 .step = 65535/100,
78 .default_value = 65535,
79 .flags = 0,
80 .type = V4L2_CTRL_TYPE_INTEGER,
81 },{
82 .id = V4L2_CID_BRIGHTNESS,
83 .type = V4L2_CTRL_TYPE_INTEGER,
84 .name = "Brightness",
85 .minimum = 0,
86 .maximum = 255,
87 .step = 1,
88 .default_value = 127,
89 .flags = 0,
90 }, {
91 .id = V4L2_CID_CONTRAST,
92 .type = V4L2_CTRL_TYPE_INTEGER,
93 .name = "Contrast",
94 .minimum = 0,
95 .maximum = 255,
96 .step = 0x1,
97 .default_value = 0x10,
98 .flags = 0,
99 }, {
100 .id = V4L2_CID_SATURATION,
101 .type = V4L2_CTRL_TYPE_INTEGER,
102 .name = "Saturation",
103 .minimum = 0,
104 .maximum = 255,
105 .step = 0x1,
106 .default_value = 127,
107 .flags = 0,
108 }, {
109 .id = V4L2_CID_HUE,
110 .type = V4L2_CTRL_TYPE_INTEGER,
111 .name = "Hue",
112 .minimum = -128,
113 .maximum = 127,
114 .step = 0x1,
115 .default_value = 0,
116 .flags = 0,
117 }
118 };
119
120 static int qctl_regs[ARRAY_SIZE(vivi_qctrl)];
121
122 #define dprintk(level,fmt, arg...) \
123 do { \
124 if (debug >= (level)) \
125 printk(KERN_DEBUG "vivi: " fmt , ## arg); \
126 } while (0)
127
128 /* ------------------------------------------------------------------
129 Basic structures
130 ------------------------------------------------------------------*/
131
132 struct vivi_fmt {
133 char *name;
134 u32 fourcc; /* v4l2 format id */
135 int depth;
136 };
137
138 static struct vivi_fmt format = {
139 .name = "4:2:2, packed, YUYV",
140 .fourcc = V4L2_PIX_FMT_YUYV,
141 .depth = 16,
142 };
143
144 struct sg_to_addr {
145 int pos;
146 struct scatterlist *sg;
147 };
148
149 /* buffer for one video frame */
150 struct vivi_buffer {
151 /* common v4l buffer stuff -- must be first */
152 struct videobuf_buffer vb;
153
154 struct vivi_fmt *fmt;
155
156 struct sg_to_addr *to_addr;
157 };
158
159 struct vivi_dmaqueue {
160 struct list_head active;
161 struct list_head queued;
162 struct timer_list timeout;
163
164 /* thread for generating video stream*/
165 struct task_struct *kthread;
166 wait_queue_head_t wq;
167 /* Counters to control fps rate */
168 int frame;
169 int ini_jiffies;
170 };
171
172 static LIST_HEAD(vivi_devlist);
173
174 struct vivi_dev {
175 struct list_head vivi_devlist;
176
177 struct semaphore lock;
178
179 int users;
180
181 /* various device info */
182 unsigned int resources;
183 struct video_device video_dev;
184
185 struct vivi_dmaqueue vidq;
186
187 /* Several counters */
188 int h,m,s,us,jiffies;
189 char timestr[13];
190 };
191
192 struct vivi_fh {
193 struct vivi_dev *dev;
194
195 /* video capture */
196 struct vivi_fmt *fmt;
197 unsigned int width,height;
198 struct videobuf_queue vb_vidq;
199
200 enum v4l2_buf_type type;
201 };
202
203 /* ------------------------------------------------------------------
204 DMA and thread functions
205 ------------------------------------------------------------------*/
206
207 /* Bars and Colors should match positions */
208
209 enum colors {
210 WHITE,
211 AMBAR,
212 CYAN,
213 GREEN,
214 MAGENTA,
215 RED,
216 BLUE
217 };
218
219 static u8 bars[8][3] = {
220 /* R G B */
221 {204,204,204}, /* white */
222 {208,208, 0}, /* ambar */
223 { 0,206,206}, /* cyan */
224 { 0,239, 0}, /* green */
225 {239, 0,239}, /* magenta */
226 {205, 0, 0}, /* red */
227 { 0, 0,255}, /* blue */
228 { 0, 0, 0}
229 };
230
231 #define TO_Y(r,g,b) (((16829*r +33039*g +6416*b + 32768)>>16)+16)
232 /* RGB to V(Cr) Color transform */
233 #define TO_V(r,g,b) (((28784*r -24103*g -4681*b + 32768)>>16)+128)
234 /* RGB to U(Cb) Color transform */
235 #define TO_U(r,g,b) (((-9714*r -19070*g +28784*b + 32768)>>16)+128)
236
237 #define TSTAMP_MIN_Y 24
238 #define TSTAMP_MAX_Y TSTAMP_MIN_Y+15
239 #define TSTAMP_MIN_X 64
240
241 static void prep_to_addr(struct sg_to_addr to_addr[],
242 struct videobuf_buffer *vb)
243 {
244 int i, pos=0;
245
246 for (i=0;i<vb->dma.nr_pages;i++) {
247 to_addr[i].sg=&vb->dma.sglist[i];
248 to_addr[i].pos=pos;
249 pos += vb->dma.sglist[i].length;
250 }
251 }
252
253 static int get_addr_pos(int pos, int pages, struct sg_to_addr to_addr[])
254 {
255 int p1=0,p2=pages-1,p3=pages/2;
256
257 /* Sanity test */
258 BUG_ON (pos>=to_addr[p2].pos+to_addr[p2].sg->length);
259
260 while (p1+1<p2) {
261 if (pos < to_addr[p3].pos) {
262 p2=p3;
263 } else {
264 p1=p3;
265 }
266 p3=(p1+p2)/2;
267 }
268 if (pos >= to_addr[p2].pos)
269 p1=p2;
270
271 return (p1);
272 }
273
274 static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
275 int hmax, int line, char *timestr)
276 {
277 int w,i,j,pos=inipos,pgpos,oldpg,y;
278 char *p,*s,*basep;
279 struct page *pg;
280 u8 chr,r,g,b,color;
281
282 /* Get first addr pointed to pixel position */
283 oldpg=get_addr_pos(pos,pages,to_addr);
284 pg=pfn_to_page(to_addr[oldpg].sg->dma_address >> PAGE_SHIFT);
285 basep = kmap_atomic(pg, KM_BOUNCE_READ)+to_addr[oldpg].sg->offset;
286
287 /* We will just duplicate the second pixel at the packet */
288 wmax/=2;
289
290 /* Generate a standard color bar pattern */
291 for (w=0;w<wmax;w++) {
292 r=bars[w*7/wmax][0];
293 g=bars[w*7/wmax][1];
294 b=bars[w*7/wmax][2];
295
296 for (color=0;color<4;color++) {
297 pgpos=get_addr_pos(pos,pages,to_addr);
298 if (pgpos!=oldpg) {
299 pg=pfn_to_page(to_addr[pgpos].sg->dma_address >> PAGE_SHIFT);
300 kunmap_atomic(basep, KM_BOUNCE_READ);
301 basep= kmap_atomic(pg, KM_BOUNCE_READ)+to_addr[pgpos].sg->offset;
302 oldpg=pgpos;
303 }
304 p=basep+pos-to_addr[pgpos].pos;
305
306 switch (color) {
307 case 0:
308 case 2:
309 *p=TO_Y(r,g,b); /* Luminance */
310 break;
311 case 1:
312 *p=TO_U(r,g,b); /* Cb */
313 break;
314 case 3:
315 *p=TO_V(r,g,b); /* Cr */
316 break;
317 }
318 pos++;
319 }
320 }
321
322 /* Checks if it is possible to show timestamp */
323 if (TSTAMP_MAX_Y>=hmax)
324 goto end;
325 if (TSTAMP_MIN_X+strlen(timestr)>=wmax)
326 goto end;
327
328 /* Print stream time */
329 if (line>=TSTAMP_MIN_Y && line<=TSTAMP_MAX_Y) {
330 j=TSTAMP_MIN_X;
331 for (s=timestr;*s;s++) {
332 chr=rom8x16_bits[(*s-0x30)*16+line-TSTAMP_MIN_Y];
333 for (i=0;i<7;i++) {
334 if (chr&1<<(7-i)) { /* Font color*/
335 r=bars[BLUE][0];
336 g=bars[BLUE][1];
337 b=bars[BLUE][2];
338 r=g=b=0;
339 g=198;
340 } else { /* Background color */
341 r=bars[WHITE][0];
342 g=bars[WHITE][1];
343 b=bars[WHITE][2];
344 r=g=b=0;
345 }
346
347 pos=inipos+j*2;
348 for (color=0;color<4;color++) {
349 pgpos=get_addr_pos(pos,pages,to_addr);
350 if (pgpos!=oldpg) {
351 pg=pfn_to_page(to_addr[pgpos].
352 sg->dma_address
353 >> PAGE_SHIFT);
354 kunmap_atomic(basep,
355 KM_BOUNCE_READ);
356 basep= kmap_atomic(pg,
357 KM_BOUNCE_READ)+
358 to_addr[pgpos].sg->offset;
359 oldpg=pgpos;
360 }
361 p=basep+pos-to_addr[pgpos].pos;
362
363 y=TO_Y(r,g,b);
364
365 switch (color) {
366 case 0:
367 case 2:
368 *p=TO_Y(r,g,b); /* Luminance */
369 break;
370 case 1:
371 *p=TO_U(r,g,b); /* Cb */
372 break;
373 case 3:
374 *p=TO_V(r,g,b); /* Cr */
375 break;
376 }
377 pos++;
378 }
379 j++;
380 }
381 }
382 }
383
384
385 end:
386 kunmap_atomic(basep, KM_BOUNCE_READ);
387 }
388 static void vivi_fillbuff(struct vivi_dev *dev,struct vivi_buffer *buf)
389 {
390 int h,pos=0;
391 int hmax = buf->vb.height;
392 int wmax = buf->vb.width;
393 struct videobuf_buffer *vb=&buf->vb;
394 struct sg_to_addr *to_addr=buf->to_addr;
395 struct timeval ts;
396
397 /* Test if DMA mapping is ready */
398 if (!vb->dma.sglist[0].dma_address)
399 return;
400
401 prep_to_addr(to_addr,vb);
402
403 /* Check if there is enough memory */
404 BUG_ON(buf->vb.dma.nr_pages << PAGE_SHIFT < (buf->vb.width*buf->vb.height)*2);
405
406 for (h=0;h<hmax;h++) {
407 gen_line(to_addr,pos,vb->dma.nr_pages,wmax,hmax,h,dev->timestr);
408 pos += wmax*2;
409 }
410
411 /* Updates stream time */
412
413 dev->us+=jiffies_to_usecs(jiffies-dev->jiffies);
414 dev->jiffies=jiffies;
415 if (dev->us>=1000000) {
416 dev->us-=1000000;
417 dev->s++;
418 if (dev->s>=60) {
419 dev->s-=60;
420 dev->m++;
421 if (dev->m>60) {
422 dev->m-=60;
423 dev->h++;
424 if (dev->h>24)
425 dev->h-=24;
426 }
427 }
428 }
429 sprintf(dev->timestr,"%02d:%02d:%02d:%03d",
430 dev->h,dev->m,dev->s,(dev->us+500)/1000);
431
432 dprintk(2,"vivifill at %s: Buffer 0x%08lx size= %d\n",dev->timestr,
433 (unsigned long)buf->vb.dma.vmalloc,pos);
434
435 /* Advice that buffer was filled */
436 buf->vb.state = STATE_DONE;
437 buf->vb.field_count++;
438 do_gettimeofday(&ts);
439 buf->vb.ts = ts;
440
441 list_del(&buf->vb.queue);
442 wake_up(&buf->vb.done);
443 }
444
445 static int restart_video_queue(struct vivi_dmaqueue *dma_q);
446
447 static void vivi_thread_tick(struct vivi_dmaqueue *dma_q)
448 {
449 struct vivi_buffer *buf;
450 struct vivi_dev *dev= container_of(dma_q,struct vivi_dev,vidq);
451
452 int bc;
453
454 /* Announces videobuf that all went ok */
455 for (bc = 0;; bc++) {
456 if (list_empty(&dma_q->active)) {
457 dprintk(1,"No active queue to serve\n");
458 break;
459 }
460
461 buf = list_entry(dma_q->active.next,
462 struct vivi_buffer, vb.queue);
463
464 /* Nobody is waiting something to be done, just return */
465 if (!waitqueue_active(&buf->vb.done)) {
466 mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
467 return;
468 }
469
470 do_gettimeofday(&buf->vb.ts);
471 dprintk(2,"[%p/%d] wakeup\n",buf,buf->vb.i);
472
473 /* Fill buffer */
474 vivi_fillbuff(dev,buf);
475 }
476 if (list_empty(&dma_q->active)) {
477 del_timer(&dma_q->timeout);
478 } else {
479 mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
480 }
481 if (bc != 1)
482 dprintk(1,"%s: %d buffers handled (should be 1)\n",__FUNCTION__,bc);
483 }
484
485 static void vivi_sleep(struct vivi_dmaqueue *dma_q)
486 {
487 int timeout;
488 DECLARE_WAITQUEUE(wait, current);
489
490 dprintk(1,"%s dma_q=0x%08lx\n",__FUNCTION__,(unsigned long)dma_q);
491
492 add_wait_queue(&dma_q->wq, &wait);
493 if (!kthread_should_stop()) {
494 dma_q->frame++;
495
496 /* Calculate time to wake up */
497 timeout=dma_q->ini_jiffies+msecs_to_jiffies((dma_q->frame*WAKE_NUMERATOR*1000)/WAKE_DENOMINATOR)-jiffies;
498
499 if (timeout <= 0) {
500 int old=dma_q->frame;
501 dma_q->frame=(jiffies_to_msecs(jiffies-dma_q->ini_jiffies)*WAKE_DENOMINATOR)/(WAKE_NUMERATOR*1000)+1;
502
503 timeout=dma_q->ini_jiffies+msecs_to_jiffies((dma_q->frame*WAKE_NUMERATOR*1000)/WAKE_DENOMINATOR)-jiffies;
504
505 dprintk(1,"underrun, losed %d frames. "
506 "Now, frame is %d. Waking on %d jiffies\n",
507 dma_q->frame-old,dma_q->frame,timeout);
508 } else
509 dprintk(1,"will sleep for %i jiffies\n",timeout);
510
511 vivi_thread_tick(dma_q);
512
513 schedule_timeout_interruptible (timeout);
514 }
515
516 remove_wait_queue(&dma_q->wq, &wait);
517 try_to_freeze();
518 }
519
520 static int vivi_thread(void *data)
521 {
522 struct vivi_dmaqueue *dma_q=data;
523
524 dprintk(1,"thread started\n");
525
526 for (;;) {
527 vivi_sleep(dma_q);
528
529 if (kthread_should_stop())
530 break;
531 }
532 dprintk(1, "thread: exit\n");
533 return 0;
534 }
535
536 static int vivi_start_thread(struct vivi_dmaqueue *dma_q)
537 {
538 dma_q->frame=0;
539 dma_q->ini_jiffies=jiffies;
540
541 dprintk(1,"%s\n",__FUNCTION__);
542 init_waitqueue_head(&dma_q->wq);
543
544 dma_q->kthread = kthread_run(vivi_thread, dma_q, "vivi");
545
546 if (dma_q->kthread == NULL) {
547 printk(KERN_ERR "vivi: kernel_thread() failed\n");
548 return -EINVAL;
549 }
550 dprintk(1,"returning from %s\n",__FUNCTION__);
551 return 0;
552 }
553
554 static void vivi_stop_thread(struct vivi_dmaqueue *dma_q)
555 {
556 dprintk(1,"%s\n",__FUNCTION__);
557 /* shutdown control thread */
558 if (dma_q->kthread) {
559 kthread_stop(dma_q->kthread);
560 dma_q->kthread=NULL;
561 }
562 }
563
564 static int restart_video_queue(struct vivi_dmaqueue *dma_q)
565 {
566 struct vivi_buffer *buf, *prev;
567 struct list_head *item;
568
569 dprintk(1,"%s dma_q=0x%08lx\n",__FUNCTION__,(unsigned long)dma_q);
570
571 if (!list_empty(&dma_q->active)) {
572 buf = list_entry(dma_q->active.next, struct vivi_buffer, vb.queue);
573 dprintk(2,"restart_queue [%p/%d]: restart dma\n",
574 buf, buf->vb.i);
575
576 dprintk(1,"Restarting video dma\n");
577 vivi_stop_thread(dma_q);
578 // vivi_start_thread(dma_q);
579
580 /* cancel all outstanding capture / vbi requests */
581 list_for_each(item,&dma_q->active) {
582 buf = list_entry(item, struct vivi_buffer, vb.queue);
583
584 list_del(&buf->vb.queue);
585 buf->vb.state = STATE_ERROR;
586 wake_up(&buf->vb.done);
587 }
588 mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
589
590 return 0;
591 }
592
593 prev = NULL;
594 for (;;) {
595 if (list_empty(&dma_q->queued))
596 return 0;
597 buf = list_entry(dma_q->queued.next, struct vivi_buffer, vb.queue);
598 if (NULL == prev) {
599 list_del(&buf->vb.queue);
600 list_add_tail(&buf->vb.queue,&dma_q->active);
601
602 dprintk(1,"Restarting video dma\n");
603 vivi_stop_thread(dma_q);
604 vivi_start_thread(dma_q);
605
606 buf->vb.state = STATE_ACTIVE;
607 mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
608 dprintk(2,"[%p/%d] restart_queue - first active\n",
609 buf,buf->vb.i);
610
611 } else if (prev->vb.width == buf->vb.width &&
612 prev->vb.height == buf->vb.height &&
613 prev->fmt == buf->fmt) {
614 list_del(&buf->vb.queue);
615 list_add_tail(&buf->vb.queue,&dma_q->active);
616 buf->vb.state = STATE_ACTIVE;
617 dprintk(2,"[%p/%d] restart_queue - move to active\n",
618 buf,buf->vb.i);
619 } else {
620 return 0;
621 }
622 prev = buf;
623 }
624 }
625
626 static void vivi_vid_timeout(unsigned long data)
627 {
628 struct vivi_dev *dev = (struct vivi_dev*)data;
629 struct vivi_dmaqueue *vidq = &dev->vidq;
630 struct vivi_buffer *buf;
631
632 while (!list_empty(&vidq->active)) {
633 buf = list_entry(vidq->active.next, struct vivi_buffer, vb.queue);
634 list_del(&buf->vb.queue);
635 buf->vb.state = STATE_ERROR;
636 wake_up(&buf->vb.done);
637 printk("vivi/0: [%p/%d] timeout\n", buf, buf->vb.i);
638 }
639
640 restart_video_queue(vidq);
641 }
642
643 /* ------------------------------------------------------------------
644 Videobuf operations
645 ------------------------------------------------------------------*/
646 static int
647 buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
648 {
649 struct vivi_fh *fh = vq->priv_data;
650
651 *size = fh->width*fh->height*2;
652
653 if (0 == *count)
654 *count = 32;
655 while (*size * *count > vid_limit * 1024 * 1024)
656 (*count)--;
657 return 0;
658 }
659
660 static void free_buffer(struct videobuf_queue *vq, struct vivi_buffer *buf)
661 {
662 dprintk(1,"%s\n",__FUNCTION__);
663
664 if (in_interrupt())
665 BUG();
666
667 /*FIXME: Maybe a spinlock is required here */
668 kfree(buf->to_addr);
669 buf->to_addr=NULL;
670
671 videobuf_waiton(&buf->vb,0,0);
672 videobuf_dma_unmap(vq, &buf->vb.dma);
673 videobuf_dma_free(&buf->vb.dma);
674 buf->vb.state = STATE_NEEDS_INIT;
675 }
676
677 #define norm_maxw() 1024
678 #define norm_maxh() 768
679 static int
680 buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
681 enum v4l2_field field)
682 {
683 struct vivi_fh *fh = vq->priv_data;
684 struct vivi_buffer *buf = container_of(vb,struct vivi_buffer,vb);
685 int rc, init_buffer = 0;
686
687 // dprintk(1,"%s, field=%d\n",__FUNCTION__,field);
688
689 BUG_ON(NULL == fh->fmt);
690 if (fh->width < 48 || fh->width > norm_maxw() ||
691 fh->height < 32 || fh->height > norm_maxh())
692 return -EINVAL;
693 buf->vb.size = fh->width*fh->height*2;
694 if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
695 return -EINVAL;
696
697 if (buf->fmt != fh->fmt ||
698 buf->vb.width != fh->width ||
699 buf->vb.height != fh->height ||
700 buf->vb.field != field) {
701 buf->fmt = fh->fmt;
702 buf->vb.width = fh->width;
703 buf->vb.height = fh->height;
704 buf->vb.field = field;
705 init_buffer = 1;
706 }
707
708 if (STATE_NEEDS_INIT == buf->vb.state) {
709 if (0 != (rc = videobuf_iolock(vq,&buf->vb,NULL)))
710 goto fail;
711 }
712
713 buf->vb.state = STATE_PREPARED;
714
715 if (NULL == (buf->to_addr = kmalloc(sizeof(*buf->to_addr) * vb->dma.nr_pages,GFP_KERNEL))) {
716 rc=-ENOMEM;
717 goto fail;
718 }
719
720 return 0;
721
722 fail:
723 free_buffer(vq,buf);
724 return rc;
725 }
726
727 static void
728 buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
729 {
730 struct vivi_buffer *buf = container_of(vb,struct vivi_buffer,vb);
731 struct vivi_fh *fh = vq->priv_data;
732 struct vivi_dev *dev = fh->dev;
733 struct vivi_dmaqueue *vidq = &dev->vidq;
734 struct vivi_buffer *prev;
735
736 if (!list_empty(&vidq->queued)) {
737 dprintk(1,"adding vb queue=0x%08lx\n",(unsigned long)&buf->vb.queue);
738 list_add_tail(&buf->vb.queue,&vidq->queued);
739 buf->vb.state = STATE_QUEUED;
740 dprintk(2,"[%p/%d] buffer_queue - append to queued\n",
741 buf, buf->vb.i);
742 } else if (list_empty(&vidq->active)) {
743 list_add_tail(&buf->vb.queue,&vidq->active);
744
745 buf->vb.state = STATE_ACTIVE;
746 mod_timer(&vidq->timeout, jiffies+BUFFER_TIMEOUT);
747 dprintk(2,"[%p/%d] buffer_queue - first active\n",
748 buf, buf->vb.i);
749
750 vivi_start_thread(vidq);
751 } else {
752 prev = list_entry(vidq->active.prev, struct vivi_buffer, vb.queue);
753 if (prev->vb.width == buf->vb.width &&
754 prev->vb.height == buf->vb.height &&
755 prev->fmt == buf->fmt) {
756 list_add_tail(&buf->vb.queue,&vidq->active);
757 buf->vb.state = STATE_ACTIVE;
758 dprintk(2,"[%p/%d] buffer_queue - append to active\n",
759 buf, buf->vb.i);
760
761 } else {
762 list_add_tail(&buf->vb.queue,&vidq->queued);
763 buf->vb.state = STATE_QUEUED;
764 dprintk(2,"[%p/%d] buffer_queue - first queued\n",
765 buf, buf->vb.i);
766 }
767 }
768 }
769
770 static void buffer_release(struct videobuf_queue *vq, struct videobuf_buffer *vb)
771 {
772 struct vivi_buffer *buf = container_of(vb,struct vivi_buffer,vb);
773 struct vivi_fh *fh = vq->priv_data;
774 struct vivi_dev *dev = (struct vivi_dev*)fh->dev;
775 struct vivi_dmaqueue *vidq = &dev->vidq;
776
777 dprintk(1,"%s\n",__FUNCTION__);
778
779 vivi_stop_thread(vidq);
780
781 free_buffer(vq,buf);
782 }
783
784 static int vivi_map_sg(void *dev, struct scatterlist *sg, int nents,
785 int direction)
786 {
787 int i;
788
789 dprintk(1,"%s, number of pages=%d\n",__FUNCTION__,nents);
790 BUG_ON(direction == DMA_NONE);
791
792 for (i = 0; i < nents; i++ ) {
793 BUG_ON(!sg[i].page);
794
795 sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
796 }
797
798 return nents;
799 }
800
801 static int vivi_unmap_sg(void *dev,struct scatterlist *sglist,int nr_pages,
802 int direction)
803 {
804 dprintk(1,"%s\n",__FUNCTION__);
805 return 0;
806 }
807
808 static int vivi_dma_sync_sg(void *dev,struct scatterlist *sglist, int nr_pages,
809 int direction)
810 {
811 // dprintk(1,"%s\n",__FUNCTION__);
812
813 // flush_write_buffers();
814 return 0;
815 }
816
817 static struct videobuf_queue_ops vivi_video_qops = {
818 .buf_setup = buffer_setup,
819 .buf_prepare = buffer_prepare,
820 .buf_queue = buffer_queue,
821 .buf_release = buffer_release,
822
823 /* Non-pci handling routines */
824 .vb_map_sg = vivi_map_sg,
825 .vb_dma_sync_sg = vivi_dma_sync_sg,
826 .vb_unmap_sg = vivi_unmap_sg,
827 };
828
829 /* ------------------------------------------------------------------
830 IOCTL handling
831 ------------------------------------------------------------------*/
832
833 static int vivi_try_fmt(struct vivi_dev *dev, struct vivi_fh *fh,
834 struct v4l2_format *f)
835 {
836 struct vivi_fmt *fmt;
837 enum v4l2_field field;
838 unsigned int maxw, maxh;
839
840 if (format.fourcc != f->fmt.pix.pixelformat) {
841 dprintk(1,"Fourcc format invalid.\n");
842 return -EINVAL;
843 }
844 fmt=&format;
845
846 field = f->fmt.pix.field;
847
848 if (field == V4L2_FIELD_ANY) {
849 // field=V4L2_FIELD_INTERLACED;
850 field=V4L2_FIELD_SEQ_TB;
851 } else if (V4L2_FIELD_INTERLACED != field) {
852 dprintk(1,"Field type invalid.\n");
853 return -EINVAL;
854 }
855
856 maxw = norm_maxw();
857 maxh = norm_maxh();
858
859 f->fmt.pix.field = field;
860 if (f->fmt.pix.height < 32)
861 f->fmt.pix.height = 32;
862 if (f->fmt.pix.height > maxh)
863 f->fmt.pix.height = maxh;
864 if (f->fmt.pix.width < 48)
865 f->fmt.pix.width = 48;
866 if (f->fmt.pix.width > maxw)
867 f->fmt.pix.width = maxw;
868 f->fmt.pix.width &= ~0x03;
869 f->fmt.pix.bytesperline =
870 (f->fmt.pix.width * fmt->depth) >> 3;
871 f->fmt.pix.sizeimage =
872 f->fmt.pix.height * f->fmt.pix.bytesperline;
873
874 return 0;
875 }
876
877 static int res_get(struct vivi_dev *dev, struct vivi_fh *fh)
878 {
879 /* is it free? */
880 down(&dev->lock);
881 if (dev->resources) {
882 /* no, someone else uses it */
883 up(&dev->lock);
884 return 0;
885 }
886 /* it's free, grab it */
887 dev->resources =1;
888 dprintk(1,"res: get\n");
889 up(&dev->lock);
890 return 1;
891 }
892
893 static int res_locked(struct vivi_dev *dev)
894 {
895 return (dev->resources);
896 }
897
898 static void res_free(struct vivi_dev *dev, struct vivi_fh *fh)
899 {
900 down(&dev->lock);
901 dev->resources = 0;
902 dprintk(1,"res: put\n");
903 up(&dev->lock);
904 }
905
906 static int vivi_do_ioctl(struct inode *inode, struct file *file, unsigned int cmd, void *arg)
907 {
908 struct vivi_fh *fh = file->private_data;
909 struct vivi_dev *dev = fh->dev;
910 int ret=0;
911
912 if (debug) {
913 if (_IOC_DIR(cmd) & _IOC_WRITE)
914 v4l_printk_ioctl_arg("vivi(w)",cmd, arg);
915 else if (!_IOC_DIR(cmd) & _IOC_READ) {
916 v4l_print_ioctl("vivi", cmd);
917 }
918 }
919
920 switch(cmd) {
921 /* --- capabilities ------------------------------------------ */
922 case VIDIOC_QUERYCAP:
923 {
924 struct v4l2_capability *cap = (struct v4l2_capability*)arg;
925
926 memset(cap, 0, sizeof(*cap));
927
928 strcpy(cap->driver, "vivi");
929 strcpy(cap->card, "vivi");
930 cap->version = VIVI_VERSION;
931 cap->capabilities =
932 V4L2_CAP_VIDEO_CAPTURE |
933 V4L2_CAP_STREAMING |
934 V4L2_CAP_READWRITE;
935 break;
936 }
937 /* --- capture ioctls ---------------------------------------- */
938 case VIDIOC_ENUM_FMT:
939 {
940 struct v4l2_fmtdesc *f = arg;
941 enum v4l2_buf_type type;
942 unsigned int index;
943
944 index = f->index;
945 type = f->type;
946
947 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
948 ret=-EINVAL;
949 break;
950 }
951
952 switch (type) {
953 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
954 if (index > 0){
955 ret=-EINVAL;
956 break;
957 }
958 memset(f,0,sizeof(*f));
959
960 f->index = index;
961 f->type = type;
962 strlcpy(f->description,format.name,sizeof(f->description));
963 f->pixelformat = format.fourcc;
964 break;
965 default:
966 ret=-EINVAL;
967 }
968 break;
969 }
970 case VIDIOC_G_FMT:
971 {
972 struct v4l2_format *f = (struct v4l2_format *)arg;
973
974 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
975 ret=-EINVAL;
976 break;
977 }
978
979 memset(&f->fmt.pix,0,sizeof(f->fmt.pix));
980 f->fmt.pix.width = fh->width;
981 f->fmt.pix.height = fh->height;
982 f->fmt.pix.field = fh->vb_vidq.field;
983 f->fmt.pix.pixelformat = fh->fmt->fourcc;
984 f->fmt.pix.bytesperline =
985 (f->fmt.pix.width * fh->fmt->depth) >> 3;
986 f->fmt.pix.sizeimage =
987 f->fmt.pix.height * f->fmt.pix.bytesperline;
988 break;
989 }
990 case VIDIOC_S_FMT:
991 {
992 struct v4l2_format *f = arg;
993
994 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
995 dprintk(1,"Only capture supported.\n");
996 ret=-EINVAL;
997 break;
998 }
999
1000 ret = vivi_try_fmt(dev,fh,f);
1001 if (ret < 0)
1002 break;
1003
1004 fh->fmt = &format;
1005 fh->width = f->fmt.pix.width;
1006 fh->height = f->fmt.pix.height;
1007 fh->vb_vidq.field = f->fmt.pix.field;
1008 fh->type = f->type;
1009
1010 break;
1011 }
1012 case VIDIOC_TRY_FMT:
1013 {
1014 struct v4l2_format *f = arg;
1015 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
1016 ret=-EINVAL;
1017 break;
1018 }
1019
1020 ret=vivi_try_fmt(dev,fh,f);
1021 break;
1022 }
1023 case VIDIOC_REQBUFS:
1024 if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
1025 ret=-EINVAL;
1026 break;
1027 }
1028 ret=videobuf_reqbufs(&fh->vb_vidq, arg);
1029 break;
1030 case VIDIOC_QUERYBUF:
1031 if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
1032 ret=-EINVAL;
1033 break;
1034 }
1035 ret=videobuf_querybuf(&fh->vb_vidq, arg);
1036 break;
1037 case VIDIOC_QBUF:
1038 if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
1039 ret=-EINVAL;
1040 break;
1041 }
1042 ret=videobuf_qbuf(&fh->vb_vidq, arg);
1043 break;
1044 case VIDIOC_DQBUF:
1045 if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
1046 ret=-EINVAL;
1047 break;
1048 }
1049 ret=videobuf_dqbuf(&fh->vb_vidq, arg,
1050 file->f_flags & O_NONBLOCK);
1051 break;
1052 #ifdef HAVE_V4L1
1053 /* --- streaming capture ------------------------------------- */
1054 case VIDIOCGMBUF:
1055 {
1056 struct video_mbuf *mbuf = arg;
1057 struct videobuf_queue *q=&fh->vb_vidq;
1058 struct v4l2_requestbuffers req;
1059 unsigned int i;
1060
1061 memset(&req,0,sizeof(req));
1062 req.type = q->type;
1063 req.count = 8;
1064 req.memory = V4L2_MEMORY_MMAP;
1065 ret = videobuf_reqbufs(q,&req);
1066 if (ret < 0)
1067 break;
1068 memset(mbuf,0,sizeof(*mbuf));
1069 mbuf->frames = req.count;
1070 mbuf->size = 0;
1071 for (i = 0; i < mbuf->frames; i++) {
1072 mbuf->offsets[i] = q->bufs[i]->boff;
1073 mbuf->size += q->bufs[i]->bsize;
1074 }
1075 break;
1076 }
1077 #endif
1078 case VIDIOC_STREAMON:
1079 {
1080 if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1081 return -EINVAL;
1082 if (!res_get(dev,fh))
1083 return -EBUSY;
1084 ret=videobuf_streamon(&fh->vb_vidq);
1085 break;
1086 }
1087 case VIDIOC_STREAMOFF:
1088 {
1089 if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
1090 ret=-EINVAL;
1091 break;
1092 }
1093 ret = videobuf_streamoff(&fh->vb_vidq);
1094 if (ret < 0)
1095 break;
1096 res_free(dev,fh);
1097 break;
1098 }
1099 /* ---------- tv norms ---------- */
1100 case VIDIOC_ENUMSTD:
1101 {
1102 struct v4l2_standard *e = arg;
1103
1104 if (e->index>0) {
1105 ret=-EINVAL;
1106 break;
1107 }
1108 ret = v4l2_video_std_construct(e, V4L2_STD_NTSC_M, "NTSC-M");
1109
1110 /* Allows vivi to use different fps from video std */
1111 e->frameperiod.numerator = WAKE_NUMERATOR;
1112 e->frameperiod.denominator = WAKE_DENOMINATOR;
1113
1114 break;
1115 }
1116 case VIDIOC_G_STD:
1117 {
1118 v4l2_std_id *id = arg;
1119
1120 *id = V4L2_STD_NTSC_M;
1121 break;
1122 }
1123 case VIDIOC_S_STD:
1124 {
1125 break;
1126 }
1127 /* ------ input switching ---------- */
1128 case VIDIOC_ENUMINPUT:
1129 { /* only one input in this sample driver */
1130 struct v4l2_input *inp = arg;
1131
1132 if (inp->index != 0) {
1133 ret=-EINVAL;
1134 break;
1135 }
1136 memset(inp, 0, sizeof(*inp));
1137
1138 inp->index = 0;
1139 inp->type = V4L2_INPUT_TYPE_CAMERA;
1140 inp->std = V4L2_STD_NTSC_M;
1141 strcpy(inp->name,"Camera");
1142 break;
1143 }
1144 case VIDIOC_G_INPUT:
1145 {
1146 unsigned int *i = arg;
1147
1148 *i = 0;
1149 break;
1150 }
1151 case VIDIOC_S_INPUT:
1152 {
1153 unsigned int *i = arg;
1154
1155 if (*i > 0)
1156 ret=-EINVAL;
1157 break;
1158 }
1159
1160 /* --- controls ---------------------------------------------- */
1161 case VIDIOC_QUERYCTRL:
1162 {
1163 struct v4l2_queryctrl *qc = arg;
1164 int i;
1165
1166 for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1167 if (qc->id && qc->id == vivi_qctrl[i].id) {
1168 memcpy(qc, &(vivi_qctrl[i]),
1169 sizeof(*qc));
1170 break;
1171 }
1172
1173 ret=-EINVAL;
1174 break;
1175 }
1176 case VIDIOC_G_CTRL:
1177 {
1178 struct v4l2_control *ctrl = arg;
1179 int i;
1180
1181 for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1182 if (ctrl->id == vivi_qctrl[i].id) {
1183 ctrl->value=qctl_regs[i];
1184 break;
1185 }
1186
1187 ret=-EINVAL;
1188 break;
1189 }
1190 case VIDIOC_S_CTRL:
1191 {
1192 struct v4l2_control *ctrl = arg;
1193 int i;
1194 for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1195 if (ctrl->id == vivi_qctrl[i].id) {
1196 if (ctrl->value <
1197 vivi_qctrl[i].minimum
1198 || ctrl->value >
1199 vivi_qctrl[i].maximum) {
1200 ret=-ERANGE;
1201 break;
1202 }
1203 qctl_regs[i]=ctrl->value;
1204 break;
1205 }
1206 ret=-EINVAL;
1207 break;
1208 }
1209 default:
1210 ret=v4l_compat_translate_ioctl(inode,file,cmd,arg,vivi_do_ioctl);
1211 }
1212
1213 if (debug) {
1214 if (ret<0) {
1215 v4l_print_ioctl("vivi(err)", cmd);
1216 dprintk(1,"errcode=%d\n",ret);
1217 } else if (_IOC_DIR(cmd) & _IOC_READ)
1218 v4l_printk_ioctl_arg("vivi(r)",cmd, arg);
1219 }
1220
1221 return ret;
1222 }
1223
1224 static int vivi_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
1225 {
1226 return video_usercopy(inode, file, cmd, arg, vivi_do_ioctl);
1227 }
1228
1229 /* ------------------------------------------------------------------
1230 File operations for the device
1231 ------------------------------------------------------------------*/
1232
1233 #define line_buf_size(norm) (norm_maxw(norm)*(format.depth+7)/8)
1234
1235 static int vivi_open(struct inode *inode, struct file *file)
1236 {
1237 int minor = iminor(inode);
1238 struct vivi_dev *h,*dev = NULL;
1239 struct vivi_fh *fh;
1240 struct list_head *list;
1241 enum v4l2_buf_type type = 0;
1242 int i;
1243
1244 printk(KERN_DEBUG "vivi: open called (minor=%d)\n",minor);
1245
1246 list_for_each(list,&vivi_devlist) {
1247 h = list_entry(list, struct vivi_dev, vivi_devlist);
1248 if (h->video_dev.minor == minor) {
1249 dev = h;
1250 type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1251 }
1252 }
1253 if (NULL == dev)
1254 return -ENODEV;
1255
1256
1257 /* If more than one user, mutex should be added */
1258 dev->users++;
1259
1260 dprintk(1,"open minor=%d type=%s users=%d\n",
1261 minor,v4l2_type_names[type],dev->users);
1262
1263 /* allocate + initialize per filehandle data */
1264 fh = kzalloc(sizeof(*fh),GFP_KERNEL);
1265 if (NULL == fh) {
1266 dev->users--;
1267 return -ENOMEM;
1268 }
1269
1270 file->private_data = fh;
1271 fh->dev = dev;
1272 fh->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1273 fh->fmt = &format;
1274 fh->width = 640;
1275 fh->height = 480;
1276
1277 /* Put all controls at a sane state */
1278 for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1279 qctl_regs[i] =vivi_qctrl[i].default_value;
1280
1281 dprintk(1,"Open: fh=0x%08lx, dev=0x%08lx, dev->vidq=0x%08lx\n",
1282 (unsigned long)fh,(unsigned long)dev,(unsigned long)&dev->vidq);
1283 dprintk(1,"Open: list_empty queued=%d\n",list_empty(&dev->vidq.queued));
1284 dprintk(1,"Open: list_empty active=%d\n",list_empty(&dev->vidq.active));
1285
1286 /* Resets frame counters */
1287 dev->h=0;
1288 dev->m=0;
1289 dev->s=0;
1290 dev->us=0;
1291 dev->jiffies=jiffies;
1292 sprintf(dev->timestr,"%02d:%02d:%02d:%03d",
1293 dev->h,dev->m,dev->s,(dev->us+500)/1000);
1294
1295 videobuf_queue_init(&fh->vb_vidq, &vivi_video_qops,
1296 NULL, NULL,
1297 fh->type,
1298 V4L2_FIELD_INTERLACED,
1299 sizeof(struct vivi_buffer),fh);
1300
1301 return 0;
1302 }
1303
1304 static ssize_t
1305 vivi_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
1306 {
1307 struct vivi_fh *fh = file->private_data;
1308
1309 if (fh->type==V4L2_BUF_TYPE_VIDEO_CAPTURE) {
1310 if (res_locked(fh->dev))
1311 return -EBUSY;
1312 return videobuf_read_one(&fh->vb_vidq, data, count, ppos,
1313 file->f_flags & O_NONBLOCK);
1314 }
1315 return 0;
1316 }
1317
1318 static unsigned int
1319 vivi_poll(struct file *file, struct poll_table_struct *wait)
1320 {
1321 struct vivi_fh *fh = file->private_data;
1322 struct vivi_buffer *buf;
1323
1324 dprintk(1,"%s\n",__FUNCTION__);
1325
1326 if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
1327 return POLLERR;
1328
1329 if (res_get(fh->dev,fh)) {
1330 dprintk(1,"poll: mmap interface\n");
1331 /* streaming capture */
1332 if (list_empty(&fh->vb_vidq.stream))
1333 return POLLERR;
1334 buf = list_entry(fh->vb_vidq.stream.next,struct vivi_buffer,vb.stream);
1335 } else {
1336 dprintk(1,"poll: read() interface\n");
1337 /* read() capture */
1338 buf = (struct vivi_buffer*)fh->vb_vidq.read_buf;
1339 if (NULL == buf)
1340 return POLLERR;
1341 }
1342 poll_wait(file, &buf->vb.done, wait);
1343 if (buf->vb.state == STATE_DONE ||
1344 buf->vb.state == STATE_ERROR)
1345 return POLLIN|POLLRDNORM;
1346 return 0;
1347 }
1348
1349 static int vivi_release(struct inode *inode, struct file *file)
1350 {
1351 struct vivi_fh *fh = file->private_data;
1352 struct vivi_dev *dev = fh->dev;
1353 struct vivi_dmaqueue *vidq = &dev->vidq;
1354
1355 int minor = iminor(inode);
1356
1357 vivi_stop_thread(vidq);
1358 videobuf_mmap_free(&fh->vb_vidq);
1359
1360 kfree (fh);
1361
1362 dev->users--;
1363
1364 printk(KERN_DEBUG "vivi: close called (minor=%d, users=%d)\n",minor,dev->users);
1365
1366 return 0;
1367 }
1368
1369 static int
1370 vivi_mmap(struct file *file, struct vm_area_struct * vma)
1371 {
1372 struct vivi_fh *fh = file->private_data;
1373 int ret;
1374
1375 dprintk (1,"mmap called, vma=0x%08lx\n",(unsigned long)vma);
1376
1377 ret=videobuf_mmap_mapper(&fh->vb_vidq, vma);
1378
1379 dprintk (1,"vma start=0x%08lx, size=%ld, ret=%d\n",
1380 (unsigned long)vma->vm_start,
1381 (unsigned long)vma->vm_end-(unsigned long)vma->vm_start,
1382 ret);
1383
1384 return ret;
1385 }
1386
1387 static struct file_operations vivi_fops = {
1388 .owner = THIS_MODULE,
1389 .open = vivi_open,
1390 .release = vivi_release,
1391 .read = vivi_read,
1392 .poll = vivi_poll,
1393 .ioctl = vivi_ioctl,
1394 .mmap = vivi_mmap,
1395 .llseek = no_llseek,
1396 };
1397
1398 static struct video_device vivi = {
1399 .name = "VTM Virtual Video Capture Board",
1400 .type = VID_TYPE_CAPTURE,
1401 .hardware = 0,
1402 .fops = &vivi_fops,
1403 .minor = -1,
1404 // .release = video_device_release,
1405 };
1406 /* ------------------------------------------------------------------
1407 Initialization and module stuff
1408 ------------------------------------------------------------------*/
1409
1410 static int __init vivi_init(void)
1411 {
1412 int ret;
1413 struct vivi_dev *dev;
1414
1415 dev = kzalloc(sizeof(*dev),GFP_KERNEL);
1416 if (NULL == dev)
1417 return -ENOMEM;
1418 list_add_tail(&dev->vivi_devlist,&vivi_devlist);
1419
1420 /* init video dma queues */
1421 INIT_LIST_HEAD(&dev->vidq.active);
1422 INIT_LIST_HEAD(&dev->vidq.queued);
1423
1424 /* initialize locks */
1425 init_MUTEX(&dev->lock);
1426
1427 dev->vidq.timeout.function = vivi_vid_timeout;
1428 dev->vidq.timeout.data = (unsigned long)dev;
1429 init_timer(&dev->vidq.timeout);
1430
1431 ret = video_register_device(&vivi, VFL_TYPE_GRABBER, video_nr);
1432 printk(KERN_INFO "Video Technology Magazine Virtual Video Capture Board (Load status: %d)\n", ret);
1433 return ret;
1434 }
1435
1436 static void __exit vivi_exit(void)
1437 {
1438 struct vivi_dev *h;
1439 struct list_head *list;
1440
1441 list_for_each(list,&vivi_devlist) {
1442 h = list_entry(list, struct vivi_dev, vivi_devlist);
1443 kfree (h);
1444 }
1445 video_unregister_device(&vivi);
1446 }
1447
1448 module_init(vivi_init);
1449 module_exit(vivi_exit);
Linux kernel - Deliverables
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