V4L/DVB (5080): Pvrusb2: Allow streaming from /dev/radioX
[linux-2.6] / drivers / media / video / vivi.c
1 /*
2  * Virtual Video driver - This code emulates a real video device with v4l2 api
3  *
4  * Copyright (c) 2006 by:
5  *      Mauro Carvalho Chehab <mchehab--a.t--infradead.org>
6  *      Ted Walther <ted--a.t--enumera.com>
7  *      John Sokol <sokol--a.t--videotechnology.com>
8  *      http://v4l.videotechnology.com/
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the BSD Licence, GNU General Public License
12  * as published by the Free Software Foundation; either version 2 of the
13  * License, or (at your option) any later version
14  */
15 #include <linux/module.h>
16 #include <linux/delay.h>
17 #include <linux/errno.h>
18 #include <linux/fs.h>
19 #include <linux/kernel.h>
20 #include <linux/slab.h>
21 #include <linux/mm.h>
22 #include <linux/ioport.h>
23 #include <linux/init.h>
24 #include <linux/sched.h>
25 #include <linux/pci.h>
26 #include <linux/random.h>
27 #include <linux/version.h>
28 #include <linux/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 #include <linux/freezer.h>
40
41 /* Wake up at about 30 fps */
42 #define WAKE_NUMERATOR 30
43 #define WAKE_DENOMINATOR 1001
44 #define BUFFER_TIMEOUT     msecs_to_jiffies(500)  /* 0.5 seconds */
45
46 /* These timers are for 1 fps - used only for testing */
47 //#define WAKE_DENOMINATOR 30 /* hack for testing purposes */
48 //#define BUFFER_TIMEOUT     msecs_to_jiffies(5000)  /* 5 seconds */
49
50 #include "font.h"
51
52 #define VIVI_MAJOR_VERSION 0
53 #define VIVI_MINOR_VERSION 4
54 #define VIVI_RELEASE 0
55 #define VIVI_VERSION KERNEL_VERSION(VIVI_MAJOR_VERSION, VIVI_MINOR_VERSION, VIVI_RELEASE)
56
57 /* Declare static vars that will be used as parameters */
58 static unsigned int vid_limit = 16;     /* Video memory limit, in Mb */
59 static struct video_device vivi;        /* Video device */
60 static int video_nr = -1;               /* /dev/videoN, -1 for autodetect */
61
62 /* supported controls */
63 static struct v4l2_queryctrl vivi_qctrl[] = {
64         {
65                 .id            = V4L2_CID_AUDIO_VOLUME,
66                 .name          = "Volume",
67                 .minimum       = 0,
68                 .maximum       = 65535,
69                 .step          = 65535/100,
70                 .default_value = 65535,
71                 .flags         = 0,
72                 .type          = V4L2_CTRL_TYPE_INTEGER,
73         },{
74                 .id            = V4L2_CID_BRIGHTNESS,
75                 .type          = V4L2_CTRL_TYPE_INTEGER,
76                 .name          = "Brightness",
77                 .minimum       = 0,
78                 .maximum       = 255,
79                 .step          = 1,
80                 .default_value = 127,
81                 .flags         = 0,
82         }, {
83                 .id            = V4L2_CID_CONTRAST,
84                 .type          = V4L2_CTRL_TYPE_INTEGER,
85                 .name          = "Contrast",
86                 .minimum       = 0,
87                 .maximum       = 255,
88                 .step          = 0x1,
89                 .default_value = 0x10,
90                 .flags         = 0,
91         }, {
92                 .id            = V4L2_CID_SATURATION,
93                 .type          = V4L2_CTRL_TYPE_INTEGER,
94                 .name          = "Saturation",
95                 .minimum       = 0,
96                 .maximum       = 255,
97                 .step          = 0x1,
98                 .default_value = 127,
99                 .flags         = 0,
100         }, {
101                 .id            = V4L2_CID_HUE,
102                 .type          = V4L2_CTRL_TYPE_INTEGER,
103                 .name          = "Hue",
104                 .minimum       = -128,
105                 .maximum       = 127,
106                 .step          = 0x1,
107                 .default_value = 0,
108                 .flags         = 0,
109         }
110 };
111
112 static int qctl_regs[ARRAY_SIZE(vivi_qctrl)];
113
114 #define dprintk(level,fmt, arg...)                                      \
115         do {                                                            \
116                 if (vivi.debug >= (level))                              \
117                         printk(KERN_DEBUG "vivi: " fmt , ## arg);       \
118         } while (0)
119
120 /* ------------------------------------------------------------------
121         Basic structures
122    ------------------------------------------------------------------*/
123
124 struct vivi_fmt {
125         char  *name;
126         u32   fourcc;          /* v4l2 format id */
127         int   depth;
128 };
129
130 static struct vivi_fmt format = {
131         .name     = "4:2:2, packed, YUYV",
132         .fourcc   = V4L2_PIX_FMT_YUYV,
133         .depth    = 16,
134 };
135
136 struct sg_to_addr {
137         int pos;
138         struct scatterlist *sg;
139 };
140
141 /* buffer for one video frame */
142 struct vivi_buffer {
143         /* common v4l buffer stuff -- must be first */
144         struct videobuf_buffer vb;
145
146         struct vivi_fmt        *fmt;
147
148         struct sg_to_addr      *to_addr;
149 };
150
151 struct vivi_dmaqueue {
152         struct list_head       active;
153         struct list_head       queued;
154         struct timer_list      timeout;
155
156         /* thread for generating video stream*/
157         struct task_struct         *kthread;
158         wait_queue_head_t          wq;
159         /* Counters to control fps rate */
160         int                        frame;
161         int                        ini_jiffies;
162 };
163
164 static LIST_HEAD(vivi_devlist);
165
166 struct vivi_dev {
167         struct list_head           vivi_devlist;
168
169         struct semaphore           lock;
170
171         int                        users;
172
173         /* various device info */
174         unsigned int               resources;
175         struct video_device        vfd;
176
177         struct vivi_dmaqueue       vidq;
178
179         /* Several counters */
180         int                        h,m,s,us,jiffies;
181         char                       timestr[13];
182 };
183
184 struct vivi_fh {
185         struct vivi_dev            *dev;
186
187         /* video capture */
188         struct vivi_fmt            *fmt;
189         unsigned int               width,height;
190         struct videobuf_queue      vb_vidq;
191
192         enum v4l2_buf_type         type;
193 };
194
195 /* ------------------------------------------------------------------
196         DMA and thread functions
197    ------------------------------------------------------------------*/
198
199 /* Bars and Colors should match positions */
200
201 enum colors {
202         WHITE,
203         AMBAR,
204         CYAN,
205         GREEN,
206         MAGENTA,
207         RED,
208         BLUE
209 };
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}
221 };
222
223 #define TO_Y(r,g,b) (((16829*r +33039*g +6416*b  + 32768)>>16)+16)
224 /* RGB to  V(Cr) Color transform */
225 #define TO_V(r,g,b) (((28784*r -24103*g -4681*b  + 32768)>>16)+128)
226 /* RGB to  U(Cb) Color transform */
227 #define TO_U(r,g,b) (((-9714*r -19070*g +28784*b + 32768)>>16)+128)
228
229 #define TSTAMP_MIN_Y 24
230 #define TSTAMP_MAX_Y TSTAMP_MIN_Y+15
231 #define TSTAMP_MIN_X 64
232
233 static void prep_to_addr(struct sg_to_addr to_addr[],
234                          struct videobuf_buffer *vb)
235 {
236         int i, pos=0;
237
238         for (i=0;i<vb->dma.nr_pages;i++) {
239                 to_addr[i].sg=&vb->dma.sglist[i];
240                 to_addr[i].pos=pos;
241                 pos += vb->dma.sglist[i].length;
242         }
243 }
244
245 static int get_addr_pos(int pos, int pages, struct sg_to_addr to_addr[])
246 {
247         int p1=0,p2=pages-1,p3=pages/2;
248
249         /* Sanity test */
250         BUG_ON (pos>=to_addr[p2].pos+to_addr[p2].sg->length);
251
252         while (p1+1<p2) {
253                 if (pos < to_addr[p3].pos) {
254                         p2=p3;
255                 } else {
256                         p1=p3;
257                 }
258                 p3=(p1+p2)/2;
259         }
260         if (pos >= to_addr[p2].pos)
261                 p1=p2;
262
263         return (p1);
264 }
265
266 static void gen_line(struct sg_to_addr to_addr[],int inipos,int pages,int wmax,
267                      int hmax, int line, char *timestr)
268 {
269         int  w,i,j,pos=inipos,pgpos,oldpg,y;
270         char *p,*s,*basep;
271         struct page *pg;
272         u8   chr,r,g,b,color;
273         unsigned long flags;
274         spinlock_t spinlock;
275
276         spin_lock_init(&spinlock);
277
278         /* Get first addr pointed to pixel position */
279         oldpg=get_addr_pos(pos,pages,to_addr);
280         pg=pfn_to_page(sg_dma_address(to_addr[oldpg].sg) >> PAGE_SHIFT);
281         spin_lock_irqsave(&spinlock,flags);
282         basep = kmap_atomic(pg, KM_BOUNCE_READ)+to_addr[oldpg].sg->offset;
283
284         /* We will just duplicate the second pixel at the packet */
285         wmax/=2;
286
287         /* Generate a standard color bar pattern */
288         for (w=0;w<wmax;w++) {
289                 r=bars[w*7/wmax][0];
290                 g=bars[w*7/wmax][1];
291                 b=bars[w*7/wmax][2];
292
293                 for (color=0;color<4;color++) {
294                         pgpos=get_addr_pos(pos,pages,to_addr);
295                         if (pgpos!=oldpg) {
296                                 pg=pfn_to_page(sg_dma_address(to_addr[pgpos].sg) >> PAGE_SHIFT);
297                                 kunmap_atomic(basep, KM_BOUNCE_READ);
298                                 basep= kmap_atomic(pg, KM_BOUNCE_READ)+to_addr[pgpos].sg->offset;
299                                 oldpg=pgpos;
300                         }
301                         p=basep+pos-to_addr[pgpos].pos;
302
303                         switch (color) {
304                                 case 0:
305                                 case 2:
306                                         *p=TO_Y(r,g,b);         /* Luminance */
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         }
318
319         /* Checks if it is possible to show timestamp */
320         if (TSTAMP_MAX_Y>=hmax)
321                 goto end;
322         if (TSTAMP_MIN_X+strlen(timestr)>=wmax)
323                 goto end;
324
325         /* Print stream time */
326         if (line>=TSTAMP_MIN_Y && line<=TSTAMP_MAX_Y) {
327                 j=TSTAMP_MIN_X;
328                 for (s=timestr;*s;s++) {
329                         chr=rom8x16_bits[(*s-0x30)*16+line-TSTAMP_MIN_Y];
330                         for (i=0;i<7;i++) {
331                                 if (chr&1<<(7-i)) { /* Font color*/
332                                         r=bars[BLUE][0];
333                                         g=bars[BLUE][1];
334                                         b=bars[BLUE][2];
335                                         r=g=b=0;
336                                         g=198;
337                                 } else { /* Background color */
338                                         r=bars[WHITE][0];
339                                         g=bars[WHITE][1];
340                                         b=bars[WHITE][2];
341                                         r=g=b=0;
342                                 }
343
344                                 pos=inipos+j*2;
345                                 for (color=0;color<4;color++) {
346                                         pgpos=get_addr_pos(pos,pages,to_addr);
347                                         if (pgpos!=oldpg) {
348                                                 pg=pfn_to_page(sg_dma_address(
349                                                                 to_addr[pgpos].sg)
350                                                                 >> PAGE_SHIFT);
351                                                 kunmap_atomic(basep,
352                                                                 KM_BOUNCE_READ);
353                                                 basep= kmap_atomic(pg,
354                                                         KM_BOUNCE_READ)+
355                                                         to_addr[pgpos].sg->offset;
356                                                 oldpg=pgpos;
357                                         }
358                                         p=basep+pos-to_addr[pgpos].pos;
359
360                                         y=TO_Y(r,g,b);
361
362                                         switch (color) {
363                                                 case 0:
364                                                 case 2:
365                                                         *p=TO_Y(r,g,b);         /* Luminance */
366                                                         break;
367                                                 case 1:
368                                                         *p=TO_U(r,g,b);         /* Cb */
369                                                         break;
370                                                 case 3:
371                                                         *p=TO_V(r,g,b);         /* Cr */
372                                                         break;
373                                         }
374                                         pos++;
375                                 }
376                                 j++;
377                         }
378                 }
379         }
380
381
382 end:
383         kunmap_atomic(basep, KM_BOUNCE_READ);
384         spin_unlock_irqrestore(&spinlock,flags);
385
386 }
387 static void vivi_fillbuff(struct vivi_dev *dev,struct vivi_buffer *buf)
388 {
389         int h,pos=0;
390         int hmax  = buf->vb.height;
391         int wmax  = buf->vb.width;
392         struct videobuf_buffer *vb=&buf->vb;
393         struct sg_to_addr *to_addr=buf->to_addr;
394         struct timeval ts;
395
396         /* Test if DMA mapping is ready */
397         if (!sg_dma_address(&vb->dma.sglist[0]))
398                 return;
399
400         prep_to_addr(to_addr,vb);
401
402         /* Check if there is enough memory */
403         BUG_ON(buf->vb.dma.nr_pages << PAGE_SHIFT < (buf->vb.width*buf->vb.height)*2);
404
405         for (h=0;h<hmax;h++) {
406                 gen_line(to_addr,pos,vb->dma.nr_pages,wmax,hmax,h,dev->timestr);
407                 pos += wmax*2;
408         }
409
410         /* Updates stream time */
411
412         dev->us+=jiffies_to_usecs(jiffies-dev->jiffies);
413         dev->jiffies=jiffies;
414         if (dev->us>=1000000) {
415                 dev->us-=1000000;
416                 dev->s++;
417                 if (dev->s>=60) {
418                         dev->s-=60;
419                         dev->m++;
420                         if (dev->m>60) {
421                                 dev->m-=60;
422                                 dev->h++;
423                                 if (dev->h>24)
424                                         dev->h-=24;
425                         }
426                 }
427         }
428         sprintf(dev->timestr,"%02d:%02d:%02d:%03d",
429                         dev->h,dev->m,dev->s,(dev->us+500)/1000);
430
431         dprintk(2,"vivifill at %s: Buffer 0x%08lx size= %d\n",dev->timestr,
432                         (unsigned long)buf->vb.dma.vmalloc,pos);
433
434         /* Advice that buffer was filled */
435         buf->vb.state = STATE_DONE;
436         buf->vb.field_count++;
437         do_gettimeofday(&ts);
438         buf->vb.ts = ts;
439
440         list_del(&buf->vb.queue);
441         wake_up(&buf->vb.done);
442 }
443
444 static int restart_video_queue(struct vivi_dmaqueue *dma_q);
445
446 static void vivi_thread_tick(struct vivi_dmaqueue  *dma_q)
447 {
448         struct vivi_buffer    *buf;
449         struct vivi_dev *dev= container_of(dma_q,struct vivi_dev,vidq);
450
451         int bc;
452
453         /* Announces videobuf that all went ok */
454         for (bc = 0;; bc++) {
455                 if (list_empty(&dma_q->active)) {
456                         dprintk(1,"No active queue to serve\n");
457                         break;
458                 }
459
460                 buf = list_entry(dma_q->active.next,
461                                  struct vivi_buffer, vb.queue);
462
463                 /* Nobody is waiting something to be done, just return */
464                 if (!waitqueue_active(&buf->vb.done)) {
465                         mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
466                         return;
467                 }
468
469                 do_gettimeofday(&buf->vb.ts);
470                 dprintk(2,"[%p/%d] wakeup\n",buf,buf->vb.i);
471
472                 /* Fill buffer */
473                 vivi_fillbuff(dev,buf);
474
475                 if (list_empty(&dma_q->active)) {
476                         del_timer(&dma_q->timeout);
477                 } else {
478                         mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
479                 }
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         mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
527
528         for (;;) {
529                 vivi_sleep(dma_q);
530
531                 if (kthread_should_stop())
532                         break;
533         }
534         dprintk(1, "thread: exit\n");
535         return 0;
536 }
537
538 static int vivi_start_thread(struct vivi_dmaqueue  *dma_q)
539 {
540         dma_q->frame=0;
541         dma_q->ini_jiffies=jiffies;
542
543         dprintk(1,"%s\n",__FUNCTION__);
544
545         dma_q->kthread = kthread_run(vivi_thread, dma_q, "vivi");
546
547         if (IS_ERR(dma_q->kthread)) {
548                 printk(KERN_ERR "vivi: kernel_thread() failed\n");
549                 return PTR_ERR(dma_q->kthread);
550         }
551         /* Wakes thread */
552         wake_up_interruptible(&dma_q->wq);
553
554         dprintk(1,"returning from %s\n",__FUNCTION__);
555         return 0;
556 }
557
558 static void vivi_stop_thread(struct vivi_dmaqueue  *dma_q)
559 {
560         dprintk(1,"%s\n",__FUNCTION__);
561         /* shutdown control thread */
562         if (dma_q->kthread) {
563                 kthread_stop(dma_q->kthread);
564                 dma_q->kthread=NULL;
565         }
566 }
567
568 static int restart_video_queue(struct vivi_dmaqueue *dma_q)
569 {
570         struct vivi_buffer *buf, *prev;
571         struct list_head *item;
572
573         dprintk(1,"%s dma_q=0x%08lx\n",__FUNCTION__,(unsigned long)dma_q);
574
575         if (!list_empty(&dma_q->active)) {
576                 buf = list_entry(dma_q->active.next, struct vivi_buffer, vb.queue);
577                 dprintk(2,"restart_queue [%p/%d]: restart dma\n",
578                         buf, buf->vb.i);
579
580                 dprintk(1,"Restarting video dma\n");
581                 vivi_stop_thread(dma_q);
582 //              vivi_start_thread(dma_q);
583
584                 /* cancel all outstanding capture / vbi requests */
585                 list_for_each(item,&dma_q->active) {
586                         buf = list_entry(item, struct vivi_buffer, vb.queue);
587
588                         list_del(&buf->vb.queue);
589                         buf->vb.state = STATE_ERROR;
590                         wake_up(&buf->vb.done);
591                 }
592                 mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
593
594                 return 0;
595         }
596
597         prev = NULL;
598         for (;;) {
599                 if (list_empty(&dma_q->queued))
600                         return 0;
601                 buf = list_entry(dma_q->queued.next, struct vivi_buffer, vb.queue);
602                 if (NULL == prev) {
603                         list_del(&buf->vb.queue);
604                         list_add_tail(&buf->vb.queue,&dma_q->active);
605
606                         dprintk(1,"Restarting video dma\n");
607                         vivi_stop_thread(dma_q);
608                         vivi_start_thread(dma_q);
609
610                         buf->vb.state = STATE_ACTIVE;
611                         mod_timer(&dma_q->timeout, jiffies+BUFFER_TIMEOUT);
612                         dprintk(2,"[%p/%d] restart_queue - first active\n",
613                                 buf,buf->vb.i);
614
615                 } else if (prev->vb.width  == buf->vb.width  &&
616                            prev->vb.height == buf->vb.height &&
617                            prev->fmt       == buf->fmt) {
618                         list_del(&buf->vb.queue);
619                         list_add_tail(&buf->vb.queue,&dma_q->active);
620                         buf->vb.state = STATE_ACTIVE;
621                         dprintk(2,"[%p/%d] restart_queue - move to active\n",
622                                 buf,buf->vb.i);
623                 } else {
624                         return 0;
625                 }
626                 prev = buf;
627         }
628 }
629
630 static void vivi_vid_timeout(unsigned long data)
631 {
632         struct vivi_dev      *dev  = (struct vivi_dev*)data;
633         struct vivi_dmaqueue *vidq = &dev->vidq;
634         struct vivi_buffer   *buf;
635
636         while (!list_empty(&vidq->active)) {
637                 buf = list_entry(vidq->active.next, struct vivi_buffer, vb.queue);
638                 list_del(&buf->vb.queue);
639                 buf->vb.state = STATE_ERROR;
640                 wake_up(&buf->vb.done);
641                 printk("vivi/0: [%p/%d] timeout\n", buf, buf->vb.i);
642         }
643
644         restart_video_queue(vidq);
645 }
646
647 /* ------------------------------------------------------------------
648         Videobuf operations
649    ------------------------------------------------------------------*/
650 static int
651 buffer_setup(struct videobuf_queue *vq, unsigned int *count, unsigned int *size)
652 {
653         struct vivi_fh *fh = vq->priv_data;
654
655         *size = fh->width*fh->height*2;
656
657         if (0 == *count)
658                 *count = 32;
659         while (*size * *count > vid_limit * 1024 * 1024)
660                 (*count)--;
661         return 0;
662 }
663
664 static void free_buffer(struct videobuf_queue *vq, struct vivi_buffer *buf)
665 {
666         dprintk(1,"%s\n",__FUNCTION__);
667
668         if (in_interrupt())
669                 BUG();
670
671         /*FIXME: Maybe a spinlock is required here */
672         kfree(buf->to_addr);
673         buf->to_addr=NULL;
674
675         videobuf_waiton(&buf->vb,0,0);
676         videobuf_dma_unmap(vq, &buf->vb.dma);
677         videobuf_dma_free(&buf->vb.dma);
678         buf->vb.state = STATE_NEEDS_INIT;
679 }
680
681 #define norm_maxw() 1024
682 #define norm_maxh() 768
683 static int
684 buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb,
685                                                 enum v4l2_field field)
686 {
687         struct vivi_fh     *fh  = vq->priv_data;
688         struct vivi_buffer *buf = container_of(vb,struct vivi_buffer,vb);
689         int rc, init_buffer = 0;
690
691 //      dprintk(1,"%s, field=%d\n",__FUNCTION__,field);
692
693         BUG_ON(NULL == fh->fmt);
694         if (fh->width  < 48 || fh->width  > norm_maxw() ||
695             fh->height < 32 || fh->height > norm_maxh())
696                 return -EINVAL;
697         buf->vb.size = fh->width*fh->height*2;
698         if (0 != buf->vb.baddr  &&  buf->vb.bsize < buf->vb.size)
699                 return -EINVAL;
700
701         if (buf->fmt       != fh->fmt    ||
702             buf->vb.width  != fh->width  ||
703             buf->vb.height != fh->height ||
704         buf->vb.field  != field) {
705                 buf->fmt       = fh->fmt;
706                 buf->vb.width  = fh->width;
707                 buf->vb.height = fh->height;
708                 buf->vb.field  = field;
709                 init_buffer = 1;
710         }
711
712         if (STATE_NEEDS_INIT == buf->vb.state) {
713                 if (0 != (rc = videobuf_iolock(vq,&buf->vb,NULL)))
714                         goto fail;
715         }
716
717         buf->vb.state = STATE_PREPARED;
718
719         if (NULL == (buf->to_addr = kmalloc(sizeof(*buf->to_addr) * vb->dma.nr_pages,GFP_KERNEL))) {
720                 rc=-ENOMEM;
721                 goto fail;
722         }
723
724         return 0;
725
726 fail:
727         free_buffer(vq,buf);
728         return rc;
729 }
730
731 static void
732 buffer_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
733 {
734         struct vivi_buffer    *buf     = container_of(vb,struct vivi_buffer,vb);
735         struct vivi_fh        *fh      = vq->priv_data;
736         struct vivi_dev       *dev     = fh->dev;
737         struct vivi_dmaqueue  *vidq    = &dev->vidq;
738         struct vivi_buffer    *prev;
739
740         if (!list_empty(&vidq->queued)) {
741                 dprintk(1,"adding vb queue=0x%08lx\n",(unsigned long)&buf->vb.queue);
742                 list_add_tail(&buf->vb.queue,&vidq->queued);
743                 buf->vb.state = STATE_QUEUED;
744                 dprintk(2,"[%p/%d] buffer_queue - append to queued\n",
745                         buf, buf->vb.i);
746         } else if (list_empty(&vidq->active)) {
747                 list_add_tail(&buf->vb.queue,&vidq->active);
748
749                 buf->vb.state = STATE_ACTIVE;
750                 mod_timer(&vidq->timeout, jiffies+BUFFER_TIMEOUT);
751                 dprintk(2,"[%p/%d] buffer_queue - first active\n",
752                         buf, buf->vb.i);
753
754                 vivi_start_thread(vidq);
755         } else {
756                 prev = list_entry(vidq->active.prev, struct vivi_buffer, vb.queue);
757                 if (prev->vb.width  == buf->vb.width  &&
758                     prev->vb.height == buf->vb.height &&
759                     prev->fmt       == buf->fmt) {
760                         list_add_tail(&buf->vb.queue,&vidq->active);
761                         buf->vb.state = STATE_ACTIVE;
762                         dprintk(2,"[%p/%d] buffer_queue - append to active\n",
763                                 buf, buf->vb.i);
764
765                 } else {
766                         list_add_tail(&buf->vb.queue,&vidq->queued);
767                         buf->vb.state = STATE_QUEUED;
768                         dprintk(2,"[%p/%d] buffer_queue - first queued\n",
769                                 buf, buf->vb.i);
770                 }
771         }
772 }
773
774 static void buffer_release(struct videobuf_queue *vq, struct videobuf_buffer *vb)
775 {
776         struct vivi_buffer   *buf  = container_of(vb,struct vivi_buffer,vb);
777         struct vivi_fh       *fh   = vq->priv_data;
778         struct vivi_dev      *dev  = (struct vivi_dev*)fh->dev;
779         struct vivi_dmaqueue *vidq = &dev->vidq;
780
781         dprintk(1,"%s\n",__FUNCTION__);
782
783         vivi_stop_thread(vidq);
784
785         free_buffer(vq,buf);
786 }
787
788 static int vivi_map_sg(void *dev, struct scatterlist *sg, int nents,
789                        int direction)
790 {
791         int i;
792
793         dprintk(1,"%s, number of pages=%d\n",__FUNCTION__,nents);
794         BUG_ON(direction == DMA_NONE);
795
796         for (i = 0; i < nents; i++ ) {
797                 BUG_ON(!sg[i].page);
798
799                 sg_dma_address(&sg[i]) = page_to_phys(sg[i].page) + sg[i].offset;
800         }
801
802         return nents;
803 }
804
805 static int vivi_unmap_sg(void *dev,struct scatterlist *sglist,int nr_pages,
806                          int direction)
807 {
808         dprintk(1,"%s\n",__FUNCTION__);
809         return 0;
810 }
811
812 static int vivi_dma_sync_sg(void *dev,struct scatterlist *sglist, int nr_pages,
813                             int direction)
814 {
815 //      dprintk(1,"%s\n",__FUNCTION__);
816
817 //      flush_write_buffers();
818         return 0;
819 }
820
821 static struct videobuf_queue_ops vivi_video_qops = {
822         .buf_setup      = buffer_setup,
823         .buf_prepare    = buffer_prepare,
824         .buf_queue      = buffer_queue,
825         .buf_release    = buffer_release,
826
827         /* Non-pci handling routines */
828         .vb_map_sg      = vivi_map_sg,
829         .vb_dma_sync_sg = vivi_dma_sync_sg,
830         .vb_unmap_sg    = vivi_unmap_sg,
831 };
832
833 /* ------------------------------------------------------------------
834         IOCTL handling
835    ------------------------------------------------------------------*/
836
837
838 static int res_get(struct vivi_dev *dev, struct vivi_fh *fh)
839 {
840         /* is it free? */
841         down(&dev->lock);
842         if (dev->resources) {
843                 /* no, someone else uses it */
844                 up(&dev->lock);
845                 return 0;
846         }
847         /* it's free, grab it */
848         dev->resources =1;
849         dprintk(1,"res: get\n");
850         up(&dev->lock);
851         return 1;
852 }
853
854 static int res_locked(struct vivi_dev *dev)
855 {
856         return (dev->resources);
857 }
858
859 static void res_free(struct vivi_dev *dev, struct vivi_fh *fh)
860 {
861         down(&dev->lock);
862         dev->resources = 0;
863         dprintk(1,"res: put\n");
864         up(&dev->lock);
865 }
866
867 /* ------------------------------------------------------------------
868         IOCTL vidioc handling
869    ------------------------------------------------------------------*/
870 static int vidioc_querycap (struct file *file, void  *priv,
871                                         struct v4l2_capability *cap)
872 {
873         strcpy(cap->driver, "vivi");
874         strcpy(cap->card, "vivi");
875         cap->version = VIVI_VERSION;
876         cap->capabilities =     V4L2_CAP_VIDEO_CAPTURE |
877                                 V4L2_CAP_STREAMING     |
878                                 V4L2_CAP_READWRITE;
879         return 0;
880 }
881
882 static int vidioc_enum_fmt_cap (struct file *file, void  *priv,
883                                         struct v4l2_fmtdesc *f)
884 {
885         if (f->index > 0)
886                 return -EINVAL;
887
888         strlcpy(f->description,format.name,sizeof(f->description));
889         f->pixelformat = format.fourcc;
890         return 0;
891 }
892
893 static int vidioc_g_fmt_cap (struct file *file, void *priv,
894                                         struct v4l2_format *f)
895 {
896         struct vivi_fh  *fh=priv;
897
898         f->fmt.pix.width        = fh->width;
899         f->fmt.pix.height       = fh->height;
900         f->fmt.pix.field        = fh->vb_vidq.field;
901         f->fmt.pix.pixelformat  = fh->fmt->fourcc;
902         f->fmt.pix.bytesperline =
903                 (f->fmt.pix.width * fh->fmt->depth) >> 3;
904         f->fmt.pix.sizeimage =
905                 f->fmt.pix.height * f->fmt.pix.bytesperline;
906
907         return (0);
908 }
909
910 static int vidioc_try_fmt_cap (struct file *file, void *priv,
911                         struct v4l2_format *f)
912 {
913         struct vivi_fmt *fmt;
914         enum v4l2_field field;
915         unsigned int maxw, maxh;
916
917         if (format.fourcc != f->fmt.pix.pixelformat) {
918                 dprintk(1,"Fourcc format (0x%08x) invalid. Driver accepts "
919                         "only 0x%08x\n",f->fmt.pix.pixelformat,format.fourcc);
920                 return -EINVAL;
921         }
922         fmt=&format;
923
924         field = f->fmt.pix.field;
925
926         if (field == V4L2_FIELD_ANY) {
927 //              field=V4L2_FIELD_INTERLACED;
928                 field=V4L2_FIELD_SEQ_TB;
929         } else if (V4L2_FIELD_INTERLACED != field) {
930                 dprintk(1,"Field type invalid.\n");
931                 return -EINVAL;
932         }
933
934         maxw  = norm_maxw();
935         maxh  = norm_maxh();
936
937         f->fmt.pix.field = field;
938         if (f->fmt.pix.height < 32)
939                 f->fmt.pix.height = 32;
940         if (f->fmt.pix.height > maxh)
941                 f->fmt.pix.height = maxh;
942         if (f->fmt.pix.width < 48)
943                 f->fmt.pix.width = 48;
944         if (f->fmt.pix.width > maxw)
945                 f->fmt.pix.width = maxw;
946         f->fmt.pix.width &= ~0x03;
947         f->fmt.pix.bytesperline =
948                 (f->fmt.pix.width * fmt->depth) >> 3;
949         f->fmt.pix.sizeimage =
950                 f->fmt.pix.height * f->fmt.pix.bytesperline;
951
952         return 0;
953 }
954
955 /*FIXME: This seems to be generic enough to be at videodev2 */
956 static int vidioc_s_fmt_cap (struct file *file, void *priv,
957                                         struct v4l2_format *f)
958 {
959         struct vivi_fh  *fh=priv;
960         int ret = vidioc_try_fmt_cap(file,fh,f);
961         if (ret < 0)
962                 return (ret);
963
964         fh->fmt           = &format;
965         fh->width         = f->fmt.pix.width;
966         fh->height        = f->fmt.pix.height;
967         fh->vb_vidq.field = f->fmt.pix.field;
968         fh->type          = f->type;
969
970         return (0);
971 }
972
973 static int vidioc_reqbufs (struct file *file, void *priv, struct v4l2_requestbuffers *p)
974 {
975         struct vivi_fh  *fh=priv;
976
977         return (videobuf_reqbufs(&fh->vb_vidq, p));
978 }
979
980 static int vidioc_querybuf (struct file *file, void *priv, struct v4l2_buffer *p)
981 {
982         struct vivi_fh  *fh=priv;
983
984         return (videobuf_querybuf(&fh->vb_vidq, p));
985 }
986
987 static int vidioc_qbuf (struct file *file, void *priv, struct v4l2_buffer *p)
988 {
989         struct vivi_fh  *fh=priv;
990
991         return (videobuf_qbuf(&fh->vb_vidq, p));
992 }
993
994 static int vidioc_dqbuf (struct file *file, void *priv, struct v4l2_buffer *p)
995 {
996         struct vivi_fh  *fh=priv;
997
998         return (videobuf_dqbuf(&fh->vb_vidq, p,
999                                 file->f_flags & O_NONBLOCK));
1000 }
1001
1002 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1003 static int vidiocgmbuf (struct file *file, void *priv, struct video_mbuf *mbuf)
1004 {
1005         struct vivi_fh  *fh=priv;
1006         struct videobuf_queue *q=&fh->vb_vidq;
1007         struct v4l2_requestbuffers req;
1008         unsigned int i;
1009         int ret;
1010
1011         req.type   = q->type;
1012         req.count  = 8;
1013         req.memory = V4L2_MEMORY_MMAP;
1014         ret = videobuf_reqbufs(q,&req);
1015         if (ret < 0)
1016                 return (ret);
1017
1018         mbuf->frames = req.count;
1019         mbuf->size   = 0;
1020         for (i = 0; i < mbuf->frames; i++) {
1021                 mbuf->offsets[i]  = q->bufs[i]->boff;
1022                 mbuf->size       += q->bufs[i]->bsize;
1023         }
1024         return (0);
1025 }
1026 #endif
1027
1028 static int vidioc_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
1029 {
1030         struct vivi_fh  *fh=priv;
1031         struct vivi_dev *dev    = fh->dev;
1032
1033         if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1034                 return -EINVAL;
1035         if (i != fh->type)
1036                 return -EINVAL;
1037
1038         if (!res_get(dev,fh))
1039                 return -EBUSY;
1040         return (videobuf_streamon(&fh->vb_vidq));
1041 }
1042
1043 static int vidioc_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
1044 {
1045         struct vivi_fh  *fh=priv;
1046         struct vivi_dev *dev    = fh->dev;
1047
1048         if (fh->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1049                 return -EINVAL;
1050         if (i != fh->type)
1051                 return -EINVAL;
1052
1053         videobuf_streamoff(&fh->vb_vidq);
1054         res_free(dev,fh);
1055
1056         return (0);
1057 }
1058
1059 static int vidioc_s_std (struct file *file, void *priv, v4l2_std_id *i)
1060 {
1061         return 0;
1062 }
1063
1064 /* only one input in this sample driver */
1065 static int vidioc_enum_input (struct file *file, void *priv,
1066                                 struct v4l2_input *inp)
1067 {
1068         if (inp->index != 0)
1069                 return -EINVAL;
1070
1071         inp->type = V4L2_INPUT_TYPE_CAMERA;
1072         inp->std = V4L2_STD_NTSC_M;
1073         strcpy(inp->name,"Camera");
1074
1075         return (0);
1076 }
1077
1078 static int vidioc_g_input (struct file *file, void *priv, unsigned int *i)
1079 {
1080         *i = 0;
1081
1082         return (0);
1083 }
1084 static int vidioc_s_input (struct file *file, void *priv, unsigned int i)
1085 {
1086         if (i > 0)
1087                 return -EINVAL;
1088
1089         return (0);
1090 }
1091
1092         /* --- controls ---------------------------------------------- */
1093 static int vidioc_queryctrl (struct file *file, void *priv,
1094                                 struct v4l2_queryctrl *qc)
1095 {
1096         int i;
1097
1098         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1099                 if (qc->id && qc->id == vivi_qctrl[i].id) {
1100                         memcpy(qc, &(vivi_qctrl[i]),
1101                                 sizeof(*qc));
1102                         return (0);
1103                 }
1104
1105         return -EINVAL;
1106 }
1107
1108 static int vidioc_g_ctrl (struct file *file, void *priv,
1109                                 struct v4l2_control *ctrl)
1110 {
1111         int i;
1112
1113         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1114                 if (ctrl->id == vivi_qctrl[i].id) {
1115                         ctrl->value=qctl_regs[i];
1116                         return (0);
1117                 }
1118
1119         return -EINVAL;
1120 }
1121 static int vidioc_s_ctrl (struct file *file, void *priv,
1122                                 struct v4l2_control *ctrl)
1123 {
1124         int i;
1125
1126         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1127                 if (ctrl->id == vivi_qctrl[i].id) {
1128                         if (ctrl->value <
1129                                 vivi_qctrl[i].minimum
1130                                 || ctrl->value >
1131                                 vivi_qctrl[i].maximum) {
1132                                         return (-ERANGE);
1133                                 }
1134                         qctl_regs[i]=ctrl->value;
1135                         return (0);
1136                 }
1137         return -EINVAL;
1138 }
1139
1140 /* ------------------------------------------------------------------
1141         File operations for the device
1142    ------------------------------------------------------------------*/
1143
1144 #define line_buf_size(norm) (norm_maxw(norm)*(format.depth+7)/8)
1145
1146 static int vivi_open(struct inode *inode, struct file *file)
1147 {
1148         int minor = iminor(inode);
1149         struct vivi_dev *h,*dev = NULL;
1150         struct vivi_fh *fh;
1151         struct list_head *list;
1152         enum v4l2_buf_type type = 0;
1153         int i;
1154
1155         printk(KERN_DEBUG "vivi: open called (minor=%d)\n",minor);
1156
1157         list_for_each(list,&vivi_devlist) {
1158                 h = list_entry(list, struct vivi_dev, vivi_devlist);
1159                 if (h->vfd.minor == minor) {
1160                         dev  = h;
1161                         type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1162                 }
1163         }
1164         if (NULL == dev)
1165                 return -ENODEV;
1166
1167
1168
1169         /* If more than one user, mutex should be added */
1170         dev->users++;
1171
1172         dprintk(1,"open minor=%d type=%s users=%d\n",
1173                                 minor,v4l2_type_names[type],dev->users);
1174
1175         /* allocate + initialize per filehandle data */
1176         fh = kzalloc(sizeof(*fh),GFP_KERNEL);
1177         if (NULL == fh) {
1178                 dev->users--;
1179                 return -ENOMEM;
1180         }
1181
1182         file->private_data = fh;
1183         fh->dev      = dev;
1184
1185         fh->type     = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1186         fh->fmt      = &format;
1187         fh->width    = 640;
1188         fh->height   = 480;
1189
1190         /* Put all controls at a sane state */
1191         for (i = 0; i < ARRAY_SIZE(vivi_qctrl); i++)
1192                 qctl_regs[i] =vivi_qctrl[i].default_value;
1193
1194         dprintk(1,"Open: fh=0x%08lx, dev=0x%08lx, dev->vidq=0x%08lx\n",
1195                 (unsigned long)fh,(unsigned long)dev,(unsigned long)&dev->vidq);
1196         dprintk(1,"Open: list_empty queued=%d\n",list_empty(&dev->vidq.queued));
1197         dprintk(1,"Open: list_empty active=%d\n",list_empty(&dev->vidq.active));
1198
1199         /* Resets frame counters */
1200         dev->h=0;
1201         dev->m=0;
1202         dev->s=0;
1203         dev->us=0;
1204         dev->jiffies=jiffies;
1205         sprintf(dev->timestr,"%02d:%02d:%02d:%03d",
1206                         dev->h,dev->m,dev->s,(dev->us+500)/1000);
1207
1208         videobuf_queue_init(&fh->vb_vidq, &vivi_video_qops,
1209                         NULL, NULL,
1210                         fh->type,
1211                         V4L2_FIELD_INTERLACED,
1212                         sizeof(struct vivi_buffer),fh);
1213
1214         return 0;
1215 }
1216
1217 static ssize_t
1218 vivi_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
1219 {
1220         struct vivi_fh        *fh = file->private_data;
1221
1222         if (fh->type==V4L2_BUF_TYPE_VIDEO_CAPTURE) {
1223                 if (res_locked(fh->dev))
1224                         return -EBUSY;
1225                 return videobuf_read_one(&fh->vb_vidq, data, count, ppos,
1226                                         file->f_flags & O_NONBLOCK);
1227         }
1228         return 0;
1229 }
1230
1231 static unsigned int
1232 vivi_poll(struct file *file, struct poll_table_struct *wait)
1233 {
1234         struct vivi_fh        *fh = file->private_data;
1235         struct vivi_buffer    *buf;
1236
1237         dprintk(1,"%s\n",__FUNCTION__);
1238
1239         if (V4L2_BUF_TYPE_VIDEO_CAPTURE != fh->type)
1240                 return POLLERR;
1241
1242         if (res_get(fh->dev,fh)) {
1243                 dprintk(1,"poll: mmap interface\n");
1244                 /* streaming capture */
1245                 if (list_empty(&fh->vb_vidq.stream))
1246                         return POLLERR;
1247                 buf = list_entry(fh->vb_vidq.stream.next,struct vivi_buffer,vb.stream);
1248         } else {
1249                 dprintk(1,"poll: read() interface\n");
1250                 /* read() capture */
1251                 buf = (struct vivi_buffer*)fh->vb_vidq.read_buf;
1252                 if (NULL == buf)
1253                         return POLLERR;
1254         }
1255         poll_wait(file, &buf->vb.done, wait);
1256         if (buf->vb.state == STATE_DONE ||
1257             buf->vb.state == STATE_ERROR)
1258                 return POLLIN|POLLRDNORM;
1259         return 0;
1260 }
1261
1262 static int vivi_release(struct inode *inode, struct file *file)
1263 {
1264         struct vivi_fh         *fh = file->private_data;
1265         struct vivi_dev *dev       = fh->dev;
1266         struct vivi_dmaqueue *vidq = &dev->vidq;
1267
1268         int minor = iminor(inode);
1269
1270         vivi_stop_thread(vidq);
1271         videobuf_mmap_free(&fh->vb_vidq);
1272
1273         kfree (fh);
1274
1275         dev->users--;
1276
1277         printk(KERN_DEBUG "vivi: close called (minor=%d, users=%d)\n",minor,dev->users);
1278
1279         return 0;
1280 }
1281
1282 static int
1283 vivi_mmap(struct file *file, struct vm_area_struct * vma)
1284 {
1285         struct vivi_fh        *fh = file->private_data;
1286         int ret;
1287
1288         dprintk (1,"mmap called, vma=0x%08lx\n",(unsigned long)vma);
1289
1290         ret=videobuf_mmap_mapper(&fh->vb_vidq, vma);
1291
1292         dprintk (1,"vma start=0x%08lx, size=%ld, ret=%d\n",
1293                 (unsigned long)vma->vm_start,
1294                 (unsigned long)vma->vm_end-(unsigned long)vma->vm_start,
1295                 ret);
1296
1297         return ret;
1298 }
1299
1300 static const struct file_operations vivi_fops = {
1301         .owner          = THIS_MODULE,
1302         .open           = vivi_open,
1303         .release        = vivi_release,
1304         .read           = vivi_read,
1305         .poll           = vivi_poll,
1306         .ioctl          = video_ioctl2, /* V4L2 ioctl handler */
1307         .mmap           = vivi_mmap,
1308         .llseek         = no_llseek,
1309 };
1310
1311 static struct video_device vivi = {
1312         .name           = "vivi",
1313         .type           = VID_TYPE_CAPTURE,
1314         .hardware       = 0,
1315         .fops           = &vivi_fops,
1316         .minor          = -1,
1317 //      .release        = video_device_release,
1318
1319         .vidioc_querycap      = vidioc_querycap,
1320         .vidioc_enum_fmt_cap  = vidioc_enum_fmt_cap,
1321         .vidioc_g_fmt_cap     = vidioc_g_fmt_cap,
1322         .vidioc_try_fmt_cap   = vidioc_try_fmt_cap,
1323         .vidioc_s_fmt_cap     = vidioc_s_fmt_cap,
1324         .vidioc_reqbufs       = vidioc_reqbufs,
1325         .vidioc_querybuf      = vidioc_querybuf,
1326         .vidioc_qbuf          = vidioc_qbuf,
1327         .vidioc_dqbuf         = vidioc_dqbuf,
1328         .vidioc_s_std         = vidioc_s_std,
1329         .vidioc_enum_input    = vidioc_enum_input,
1330         .vidioc_g_input       = vidioc_g_input,
1331         .vidioc_s_input       = vidioc_s_input,
1332         .vidioc_queryctrl     = vidioc_queryctrl,
1333         .vidioc_g_ctrl        = vidioc_g_ctrl,
1334         .vidioc_s_ctrl        = vidioc_s_ctrl,
1335         .vidioc_streamon      = vidioc_streamon,
1336         .vidioc_streamoff     = vidioc_streamoff,
1337 #ifdef CONFIG_VIDEO_V4L1_COMPAT
1338         .vidiocgmbuf          = vidiocgmbuf,
1339 #endif
1340         .tvnorms              = V4L2_STD_NTSC_M,
1341         .current_norm         = V4L2_STD_NTSC_M,
1342 };
1343 /* -----------------------------------------------------------------
1344         Initialization and module stuff
1345    ------------------------------------------------------------------*/
1346
1347 static int __init vivi_init(void)
1348 {
1349         int ret;
1350         struct vivi_dev *dev;
1351
1352         dev = kzalloc(sizeof(*dev),GFP_KERNEL);
1353         if (NULL == dev)
1354                 return -ENOMEM;
1355         list_add_tail(&dev->vivi_devlist,&vivi_devlist);
1356
1357         /* init video dma queues */
1358         INIT_LIST_HEAD(&dev->vidq.active);
1359         INIT_LIST_HEAD(&dev->vidq.queued);
1360         init_waitqueue_head(&dev->vidq.wq);
1361
1362         /* initialize locks */
1363         init_MUTEX(&dev->lock);
1364
1365         dev->vidq.timeout.function = vivi_vid_timeout;
1366         dev->vidq.timeout.data     = (unsigned long)dev;
1367         init_timer(&dev->vidq.timeout);
1368
1369         ret = video_register_device(&vivi, VFL_TYPE_GRABBER, video_nr);
1370         printk(KERN_INFO "Video Technology Magazine Virtual Video Capture Board (Load status: %d)\n", ret);
1371         return ret;
1372 }
1373
1374 static void __exit vivi_exit(void)
1375 {
1376         struct vivi_dev *h;
1377         struct list_head *list;
1378
1379         while (!list_empty(&vivi_devlist)) {
1380                 list = vivi_devlist.next;
1381                 list_del(list);
1382                 h = list_entry(list, struct vivi_dev, vivi_devlist);
1383                 kfree (h);
1384         }
1385         video_unregister_device(&vivi);
1386 }
1387
1388 module_init(vivi_init);
1389 module_exit(vivi_exit);
1390
1391 MODULE_DESCRIPTION("Video Technology Magazine Virtual Video Capture Board");
1392 MODULE_AUTHOR("Mauro Carvalho Chehab, Ted Walther and John Sokol");
1393 MODULE_LICENSE("Dual BSD/GPL");
1394
1395 module_param(video_nr, int, 0);
1396
1397 module_param_named(debug,vivi.debug, int, 0644);
1398 MODULE_PARM_DESC(debug,"activates debug info");
1399
1400 module_param(vid_limit,int,0644);
1401 MODULE_PARM_DESC(vid_limit,"capture memory limit in megabytes");
1402