Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild
[linux-2.6-microblaze.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  *      Conversion to videobuf2 by Pawel Osciak & Marek Szyprowski
11  *      Copyright (c) 2010 Samsung Electronics
12  *
13  * This program is free software; you can redistribute it and/or modify
14  * it under the terms of the BSD Licence, GNU General Public License
15  * as published by the Free Software Foundation; either version 2 of the
16  * License, or (at your option) any later version
17  */
18 #include <linux/module.h>
19 #include <linux/errno.h>
20 #include <linux/kernel.h>
21 #include <linux/init.h>
22 #include <linux/sched.h>
23 #include <linux/slab.h>
24 #include <linux/font.h>
25 #include <linux/mutex.h>
26 #include <linux/videodev2.h>
27 #include <linux/kthread.h>
28 #include <linux/freezer.h>
29 #include <media/videobuf2-vmalloc.h>
30 #include <media/v4l2-device.h>
31 #include <media/v4l2-ioctl.h>
32 #include <media/v4l2-ctrls.h>
33 #include <media/v4l2-fh.h>
34 #include <media/v4l2-event.h>
35 #include <media/v4l2-common.h>
36
37 #define VIVI_MODULE_NAME "vivi"
38
39 /* Wake up at about 30 fps */
40 #define WAKE_NUMERATOR 30
41 #define WAKE_DENOMINATOR 1001
42 #define BUFFER_TIMEOUT     msecs_to_jiffies(500)  /* 0.5 seconds */
43
44 #define MAX_WIDTH 1920
45 #define MAX_HEIGHT 1200
46
47 #define VIVI_VERSION "0.8.1"
48
49 MODULE_DESCRIPTION("Video Technology Magazine Virtual Video Capture Board");
50 MODULE_AUTHOR("Mauro Carvalho Chehab, Ted Walther and John Sokol");
51 MODULE_LICENSE("Dual BSD/GPL");
52 MODULE_VERSION(VIVI_VERSION);
53
54 static unsigned video_nr = -1;
55 module_param(video_nr, uint, 0644);
56 MODULE_PARM_DESC(video_nr, "videoX start number, -1 is autodetect");
57
58 static unsigned n_devs = 1;
59 module_param(n_devs, uint, 0644);
60 MODULE_PARM_DESC(n_devs, "number of video devices to create");
61
62 static unsigned debug;
63 module_param(debug, uint, 0644);
64 MODULE_PARM_DESC(debug, "activates debug info");
65
66 static unsigned int vid_limit = 16;
67 module_param(vid_limit, uint, 0644);
68 MODULE_PARM_DESC(vid_limit, "capture memory limit in megabytes");
69
70 /* Global font descriptor */
71 static const u8 *font8x16;
72
73 #define dprintk(dev, level, fmt, arg...) \
74         v4l2_dbg(level, debug, &dev->v4l2_dev, fmt, ## arg)
75
76 /* ------------------------------------------------------------------
77         Basic structures
78    ------------------------------------------------------------------*/
79
80 struct vivi_fmt {
81         char  *name;
82         u32   fourcc;          /* v4l2 format id */
83         int   depth;
84 };
85
86 static struct vivi_fmt formats[] = {
87         {
88                 .name     = "4:2:2, packed, YUYV",
89                 .fourcc   = V4L2_PIX_FMT_YUYV,
90                 .depth    = 16,
91         },
92         {
93                 .name     = "4:2:2, packed, UYVY",
94                 .fourcc   = V4L2_PIX_FMT_UYVY,
95                 .depth    = 16,
96         },
97         {
98                 .name     = "RGB565 (LE)",
99                 .fourcc   = V4L2_PIX_FMT_RGB565, /* gggbbbbb rrrrrggg */
100                 .depth    = 16,
101         },
102         {
103                 .name     = "RGB565 (BE)",
104                 .fourcc   = V4L2_PIX_FMT_RGB565X, /* rrrrrggg gggbbbbb */
105                 .depth    = 16,
106         },
107         {
108                 .name     = "RGB555 (LE)",
109                 .fourcc   = V4L2_PIX_FMT_RGB555, /* gggbbbbb arrrrrgg */
110                 .depth    = 16,
111         },
112         {
113                 .name     = "RGB555 (BE)",
114                 .fourcc   = V4L2_PIX_FMT_RGB555X, /* arrrrrgg gggbbbbb */
115                 .depth    = 16,
116         },
117 };
118
119 static struct vivi_fmt *get_format(struct v4l2_format *f)
120 {
121         struct vivi_fmt *fmt;
122         unsigned int k;
123
124         for (k = 0; k < ARRAY_SIZE(formats); k++) {
125                 fmt = &formats[k];
126                 if (fmt->fourcc == f->fmt.pix.pixelformat)
127                         break;
128         }
129
130         if (k == ARRAY_SIZE(formats))
131                 return NULL;
132
133         return &formats[k];
134 }
135
136 /* buffer for one video frame */
137 struct vivi_buffer {
138         /* common v4l buffer stuff -- must be first */
139         struct vb2_buffer       vb;
140         struct list_head        list;
141         struct vivi_fmt        *fmt;
142 };
143
144 struct vivi_dmaqueue {
145         struct list_head       active;
146
147         /* thread for generating video stream*/
148         struct task_struct         *kthread;
149         wait_queue_head_t          wq;
150         /* Counters to control fps rate */
151         int                        frame;
152         int                        ini_jiffies;
153 };
154
155 static LIST_HEAD(vivi_devlist);
156
157 struct vivi_dev {
158         struct list_head           vivi_devlist;
159         struct v4l2_device         v4l2_dev;
160         struct v4l2_ctrl_handler   ctrl_handler;
161
162         /* controls */
163         struct v4l2_ctrl           *brightness;
164         struct v4l2_ctrl           *contrast;
165         struct v4l2_ctrl           *saturation;
166         struct v4l2_ctrl           *hue;
167         struct {
168                 /* autogain/gain cluster */
169                 struct v4l2_ctrl           *autogain;
170                 struct v4l2_ctrl           *gain;
171         };
172         struct v4l2_ctrl           *volume;
173         struct v4l2_ctrl           *button;
174         struct v4l2_ctrl           *boolean;
175         struct v4l2_ctrl           *int32;
176         struct v4l2_ctrl           *int64;
177         struct v4l2_ctrl           *menu;
178         struct v4l2_ctrl           *string;
179         struct v4l2_ctrl           *bitmask;
180
181         spinlock_t                 slock;
182         struct mutex               mutex;
183
184         /* various device info */
185         struct video_device        *vfd;
186
187         struct vivi_dmaqueue       vidq;
188
189         /* Several counters */
190         unsigned                   ms;
191         unsigned long              jiffies;
192         unsigned                   button_pressed;
193
194         int                        mv_count;    /* Controls bars movement */
195
196         /* Input Number */
197         int                        input;
198
199         /* video capture */
200         struct vivi_fmt            *fmt;
201         unsigned int               width, height;
202         struct vb2_queue           vb_vidq;
203         enum v4l2_field            field;
204         unsigned int               field_count;
205
206         u8                         bars[9][3];
207         u8                         line[MAX_WIDTH * 4];
208 };
209
210 /* ------------------------------------------------------------------
211         DMA and thread functions
212    ------------------------------------------------------------------*/
213
214 /* Bars and Colors should match positions */
215
216 enum colors {
217         WHITE,
218         AMBER,
219         CYAN,
220         GREEN,
221         MAGENTA,
222         RED,
223         BLUE,
224         BLACK,
225         TEXT_BLACK,
226 };
227
228 /* R   G   B */
229 #define COLOR_WHITE     {204, 204, 204}
230 #define COLOR_AMBER     {208, 208,   0}
231 #define COLOR_CYAN      {  0, 206, 206}
232 #define COLOR_GREEN     {  0, 239,   0}
233 #define COLOR_MAGENTA   {239,   0, 239}
234 #define COLOR_RED       {205,   0,   0}
235 #define COLOR_BLUE      {  0,   0, 255}
236 #define COLOR_BLACK     {  0,   0,   0}
237
238 struct bar_std {
239         u8 bar[9][3];
240 };
241
242 /* Maximum number of bars are 10 - otherwise, the input print code
243    should be modified */
244 static struct bar_std bars[] = {
245         {       /* Standard ITU-R color bar sequence */
246                 { COLOR_WHITE, COLOR_AMBER, COLOR_CYAN, COLOR_GREEN,
247                   COLOR_MAGENTA, COLOR_RED, COLOR_BLUE, COLOR_BLACK, COLOR_BLACK }
248         }, {
249                 { COLOR_WHITE, COLOR_AMBER, COLOR_BLACK, COLOR_WHITE,
250                   COLOR_AMBER, COLOR_BLACK, COLOR_WHITE, COLOR_AMBER, COLOR_BLACK }
251         }, {
252                 { COLOR_WHITE, COLOR_CYAN, COLOR_BLACK, COLOR_WHITE,
253                   COLOR_CYAN, COLOR_BLACK, COLOR_WHITE, COLOR_CYAN, COLOR_BLACK }
254         }, {
255                 { COLOR_WHITE, COLOR_GREEN, COLOR_BLACK, COLOR_WHITE,
256                   COLOR_GREEN, COLOR_BLACK, COLOR_WHITE, COLOR_GREEN, COLOR_BLACK }
257         },
258 };
259
260 #define NUM_INPUTS ARRAY_SIZE(bars)
261
262 #define TO_Y(r, g, b) \
263         (((16829 * r + 33039 * g + 6416 * b  + 32768) >> 16) + 16)
264 /* RGB to  V(Cr) Color transform */
265 #define TO_V(r, g, b) \
266         (((28784 * r - 24103 * g - 4681 * b  + 32768) >> 16) + 128)
267 /* RGB to  U(Cb) Color transform */
268 #define TO_U(r, g, b) \
269         (((-9714 * r - 19070 * g + 28784 * b + 32768) >> 16) + 128)
270
271 /* precalculate color bar values to speed up rendering */
272 static void precalculate_bars(struct vivi_dev *dev)
273 {
274         u8 r, g, b;
275         int k, is_yuv;
276
277         for (k = 0; k < 9; k++) {
278                 r = bars[dev->input].bar[k][0];
279                 g = bars[dev->input].bar[k][1];
280                 b = bars[dev->input].bar[k][2];
281                 is_yuv = 0;
282
283                 switch (dev->fmt->fourcc) {
284                 case V4L2_PIX_FMT_YUYV:
285                 case V4L2_PIX_FMT_UYVY:
286                         is_yuv = 1;
287                         break;
288                 case V4L2_PIX_FMT_RGB565:
289                 case V4L2_PIX_FMT_RGB565X:
290                         r >>= 3;
291                         g >>= 2;
292                         b >>= 3;
293                         break;
294                 case V4L2_PIX_FMT_RGB555:
295                 case V4L2_PIX_FMT_RGB555X:
296                         r >>= 3;
297                         g >>= 3;
298                         b >>= 3;
299                         break;
300                 }
301
302                 if (is_yuv) {
303                         dev->bars[k][0] = TO_Y(r, g, b);        /* Luma */
304                         dev->bars[k][1] = TO_U(r, g, b);        /* Cb */
305                         dev->bars[k][2] = TO_V(r, g, b);        /* Cr */
306                 } else {
307                         dev->bars[k][0] = r;
308                         dev->bars[k][1] = g;
309                         dev->bars[k][2] = b;
310                 }
311         }
312 }
313
314 #define TSTAMP_MIN_Y    24
315 #define TSTAMP_MAX_Y    (TSTAMP_MIN_Y + 15)
316 #define TSTAMP_INPUT_X  10
317 #define TSTAMP_MIN_X    (54 + TSTAMP_INPUT_X)
318
319 static void gen_twopix(struct vivi_dev *dev, u8 *buf, int colorpos)
320 {
321         u8 r_y, g_u, b_v;
322         int color;
323         u8 *p;
324
325         r_y = dev->bars[colorpos][0]; /* R or precalculated Y */
326         g_u = dev->bars[colorpos][1]; /* G or precalculated U */
327         b_v = dev->bars[colorpos][2]; /* B or precalculated V */
328
329         for (color = 0; color < 4; color++) {
330                 p = buf + color;
331
332                 switch (dev->fmt->fourcc) {
333                 case V4L2_PIX_FMT_YUYV:
334                         switch (color) {
335                         case 0:
336                         case 2:
337                                 *p = r_y;
338                                 break;
339                         case 1:
340                                 *p = g_u;
341                                 break;
342                         case 3:
343                                 *p = b_v;
344                                 break;
345                         }
346                         break;
347                 case V4L2_PIX_FMT_UYVY:
348                         switch (color) {
349                         case 1:
350                         case 3:
351                                 *p = r_y;
352                                 break;
353                         case 0:
354                                 *p = g_u;
355                                 break;
356                         case 2:
357                                 *p = b_v;
358                                 break;
359                         }
360                         break;
361                 case V4L2_PIX_FMT_RGB565:
362                         switch (color) {
363                         case 0:
364                         case 2:
365                                 *p = (g_u << 5) | b_v;
366                                 break;
367                         case 1:
368                         case 3:
369                                 *p = (r_y << 3) | (g_u >> 3);
370                                 break;
371                         }
372                         break;
373                 case V4L2_PIX_FMT_RGB565X:
374                         switch (color) {
375                         case 0:
376                         case 2:
377                                 *p = (r_y << 3) | (g_u >> 3);
378                                 break;
379                         case 1:
380                         case 3:
381                                 *p = (g_u << 5) | b_v;
382                                 break;
383                         }
384                         break;
385                 case V4L2_PIX_FMT_RGB555:
386                         switch (color) {
387                         case 0:
388                         case 2:
389                                 *p = (g_u << 5) | b_v;
390                                 break;
391                         case 1:
392                         case 3:
393                                 *p = (r_y << 2) | (g_u >> 3);
394                                 break;
395                         }
396                         break;
397                 case V4L2_PIX_FMT_RGB555X:
398                         switch (color) {
399                         case 0:
400                         case 2:
401                                 *p = (r_y << 2) | (g_u >> 3);
402                                 break;
403                         case 1:
404                         case 3:
405                                 *p = (g_u << 5) | b_v;
406                                 break;
407                         }
408                         break;
409                 }
410         }
411 }
412
413 static void precalculate_line(struct vivi_dev *dev)
414 {
415         int w;
416
417         for (w = 0; w < dev->width * 2; w += 2) {
418                 int colorpos = (w / (dev->width / 8) % 8);
419
420                 gen_twopix(dev, dev->line + w * 2, colorpos);
421         }
422 }
423
424 static void gen_text(struct vivi_dev *dev, char *basep,
425                                         int y, int x, char *text)
426 {
427         int line;
428
429         /* Checks if it is possible to show string */
430         if (y + 16 >= dev->height || x + strlen(text) * 8 >= dev->width)
431                 return;
432
433         /* Print stream time */
434         for (line = y; line < y + 16; line++) {
435                 int j = 0;
436                 char *pos = basep + line * dev->width * 2 + x * 2;
437                 char *s;
438
439                 for (s = text; *s; s++) {
440                         u8 chr = font8x16[*s * 16 + line - y];
441                         int i;
442
443                         for (i = 0; i < 7; i++, j++) {
444                                 /* Draw white font on black background */
445                                 if (chr & (1 << (7 - i)))
446                                         gen_twopix(dev, pos + j * 2, WHITE);
447                                 else
448                                         gen_twopix(dev, pos + j * 2, TEXT_BLACK);
449                         }
450                 }
451         }
452 }
453
454 static void vivi_fillbuff(struct vivi_dev *dev, struct vivi_buffer *buf)
455 {
456         int wmax = dev->width;
457         int hmax = dev->height;
458         struct timeval ts;
459         void *vbuf = vb2_plane_vaddr(&buf->vb, 0);
460         unsigned ms;
461         char str[100];
462         int h, line = 1;
463         s32 gain;
464
465         if (!vbuf)
466                 return;
467
468         for (h = 0; h < hmax; h++)
469                 memcpy(vbuf + h * wmax * 2, dev->line + (dev->mv_count % wmax) * 2, wmax * 2);
470
471         /* Updates stream time */
472
473         dev->ms += jiffies_to_msecs(jiffies - dev->jiffies);
474         dev->jiffies = jiffies;
475         ms = dev->ms;
476         snprintf(str, sizeof(str), " %02d:%02d:%02d:%03d ",
477                         (ms / (60 * 60 * 1000)) % 24,
478                         (ms / (60 * 1000)) % 60,
479                         (ms / 1000) % 60,
480                         ms % 1000);
481         gen_text(dev, vbuf, line++ * 16, 16, str);
482         snprintf(str, sizeof(str), " %dx%d, input %d ",
483                         dev->width, dev->height, dev->input);
484         gen_text(dev, vbuf, line++ * 16, 16, str);
485
486         gain = v4l2_ctrl_g_ctrl(dev->gain);
487         mutex_lock(&dev->ctrl_handler.lock);
488         snprintf(str, sizeof(str), " brightness %3d, contrast %3d, saturation %3d, hue %d ",
489                         dev->brightness->cur.val,
490                         dev->contrast->cur.val,
491                         dev->saturation->cur.val,
492                         dev->hue->cur.val);
493         gen_text(dev, vbuf, line++ * 16, 16, str);
494         snprintf(str, sizeof(str), " autogain %d, gain %3d, volume %3d ",
495                         dev->autogain->cur.val, gain, dev->volume->cur.val);
496         gen_text(dev, vbuf, line++ * 16, 16, str);
497         snprintf(str, sizeof(str), " int32 %d, int64 %lld, bitmask %08x ",
498                         dev->int32->cur.val,
499                         dev->int64->cur.val64,
500                         dev->bitmask->cur.val);
501         gen_text(dev, vbuf, line++ * 16, 16, str);
502         snprintf(str, sizeof(str), " boolean %d, menu %s, string \"%s\" ",
503                         dev->boolean->cur.val,
504                         dev->menu->qmenu[dev->menu->cur.val],
505                         dev->string->cur.string);
506         mutex_unlock(&dev->ctrl_handler.lock);
507         gen_text(dev, vbuf, line++ * 16, 16, str);
508         if (dev->button_pressed) {
509                 dev->button_pressed--;
510                 snprintf(str, sizeof(str), " button pressed!");
511                 gen_text(dev, vbuf, line++ * 16, 16, str);
512         }
513
514         dev->mv_count += 2;
515
516         buf->vb.v4l2_buf.field = dev->field;
517         dev->field_count++;
518         buf->vb.v4l2_buf.sequence = dev->field_count >> 1;
519         do_gettimeofday(&ts);
520         buf->vb.v4l2_buf.timestamp = ts;
521 }
522
523 static void vivi_thread_tick(struct vivi_dev *dev)
524 {
525         struct vivi_dmaqueue *dma_q = &dev->vidq;
526         struct vivi_buffer *buf;
527         unsigned long flags = 0;
528
529         dprintk(dev, 1, "Thread tick\n");
530
531         spin_lock_irqsave(&dev->slock, flags);
532         if (list_empty(&dma_q->active)) {
533                 dprintk(dev, 1, "No active queue to serve\n");
534                 spin_unlock_irqrestore(&dev->slock, flags);
535                 return;
536         }
537
538         buf = list_entry(dma_q->active.next, struct vivi_buffer, list);
539         list_del(&buf->list);
540         spin_unlock_irqrestore(&dev->slock, flags);
541
542         do_gettimeofday(&buf->vb.v4l2_buf.timestamp);
543
544         /* Fill buffer */
545         vivi_fillbuff(dev, buf);
546         dprintk(dev, 1, "filled buffer %p\n", buf);
547
548         vb2_buffer_done(&buf->vb, VB2_BUF_STATE_DONE);
549         dprintk(dev, 2, "[%p/%d] done\n", buf, buf->vb.v4l2_buf.index);
550 }
551
552 #define frames_to_ms(frames)                                    \
553         ((frames * WAKE_NUMERATOR * 1000) / WAKE_DENOMINATOR)
554
555 static void vivi_sleep(struct vivi_dev *dev)
556 {
557         struct vivi_dmaqueue *dma_q = &dev->vidq;
558         int timeout;
559         DECLARE_WAITQUEUE(wait, current);
560
561         dprintk(dev, 1, "%s dma_q=0x%08lx\n", __func__,
562                 (unsigned long)dma_q);
563
564         add_wait_queue(&dma_q->wq, &wait);
565         if (kthread_should_stop())
566                 goto stop_task;
567
568         /* Calculate time to wake up */
569         timeout = msecs_to_jiffies(frames_to_ms(1));
570
571         vivi_thread_tick(dev);
572
573         schedule_timeout_interruptible(timeout);
574
575 stop_task:
576         remove_wait_queue(&dma_q->wq, &wait);
577         try_to_freeze();
578 }
579
580 static int vivi_thread(void *data)
581 {
582         struct vivi_dev *dev = data;
583
584         dprintk(dev, 1, "thread started\n");
585
586         set_freezable();
587
588         for (;;) {
589                 vivi_sleep(dev);
590
591                 if (kthread_should_stop())
592                         break;
593         }
594         dprintk(dev, 1, "thread: exit\n");
595         return 0;
596 }
597
598 static int vivi_start_generating(struct vivi_dev *dev)
599 {
600         struct vivi_dmaqueue *dma_q = &dev->vidq;
601
602         dprintk(dev, 1, "%s\n", __func__);
603
604         /* Resets frame counters */
605         dev->ms = 0;
606         dev->mv_count = 0;
607         dev->jiffies = jiffies;
608
609         dma_q->frame = 0;
610         dma_q->ini_jiffies = jiffies;
611         dma_q->kthread = kthread_run(vivi_thread, dev, dev->v4l2_dev.name);
612
613         if (IS_ERR(dma_q->kthread)) {
614                 v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
615                 return PTR_ERR(dma_q->kthread);
616         }
617         /* Wakes thread */
618         wake_up_interruptible(&dma_q->wq);
619
620         dprintk(dev, 1, "returning from %s\n", __func__);
621         return 0;
622 }
623
624 static void vivi_stop_generating(struct vivi_dev *dev)
625 {
626         struct vivi_dmaqueue *dma_q = &dev->vidq;
627
628         dprintk(dev, 1, "%s\n", __func__);
629
630         /* shutdown control thread */
631         if (dma_q->kthread) {
632                 kthread_stop(dma_q->kthread);
633                 dma_q->kthread = NULL;
634         }
635
636         /*
637          * Typical driver might need to wait here until dma engine stops.
638          * In this case we can abort imiedetly, so it's just a noop.
639          */
640
641         /* Release all active buffers */
642         while (!list_empty(&dma_q->active)) {
643                 struct vivi_buffer *buf;
644                 buf = list_entry(dma_q->active.next, struct vivi_buffer, list);
645                 list_del(&buf->list);
646                 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
647                 dprintk(dev, 2, "[%p/%d] done\n", buf, buf->vb.v4l2_buf.index);
648         }
649 }
650 /* ------------------------------------------------------------------
651         Videobuf operations
652    ------------------------------------------------------------------*/
653 static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
654                                 unsigned int *nbuffers, unsigned int *nplanes,
655                                 unsigned int sizes[], void *alloc_ctxs[])
656 {
657         struct vivi_dev *dev = vb2_get_drv_priv(vq);
658         unsigned long size;
659
660         size = dev->width * dev->height * 2;
661
662         if (0 == *nbuffers)
663                 *nbuffers = 32;
664
665         while (size * *nbuffers > vid_limit * 1024 * 1024)
666                 (*nbuffers)--;
667
668         *nplanes = 1;
669
670         sizes[0] = size;
671
672         /*
673          * videobuf2-vmalloc allocator is context-less so no need to set
674          * alloc_ctxs array.
675          */
676
677         dprintk(dev, 1, "%s, count=%d, size=%ld\n", __func__,
678                 *nbuffers, size);
679
680         return 0;
681 }
682
683 static int buffer_init(struct vb2_buffer *vb)
684 {
685         struct vivi_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
686
687         BUG_ON(NULL == dev->fmt);
688
689         /*
690          * This callback is called once per buffer, after its allocation.
691          *
692          * Vivi does not allow changing format during streaming, but it is
693          * possible to do so when streaming is paused (i.e. in streamoff state).
694          * Buffers however are not freed when going into streamoff and so
695          * buffer size verification has to be done in buffer_prepare, on each
696          * qbuf.
697          * It would be best to move verification code here to buf_init and
698          * s_fmt though.
699          */
700
701         return 0;
702 }
703
704 static int buffer_prepare(struct vb2_buffer *vb)
705 {
706         struct vivi_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
707         struct vivi_buffer *buf = container_of(vb, struct vivi_buffer, vb);
708         unsigned long size;
709
710         dprintk(dev, 1, "%s, field=%d\n", __func__, vb->v4l2_buf.field);
711
712         BUG_ON(NULL == dev->fmt);
713
714         /*
715          * Theses properties only change when queue is idle, see s_fmt.
716          * The below checks should not be performed here, on each
717          * buffer_prepare (i.e. on each qbuf). Most of the code in this function
718          * should thus be moved to buffer_init and s_fmt.
719          */
720         if (dev->width  < 48 || dev->width  > MAX_WIDTH ||
721             dev->height < 32 || dev->height > MAX_HEIGHT)
722                 return -EINVAL;
723
724         size = dev->width * dev->height * 2;
725         if (vb2_plane_size(vb, 0) < size) {
726                 dprintk(dev, 1, "%s data will not fit into plane (%lu < %lu)\n",
727                                 __func__, vb2_plane_size(vb, 0), size);
728                 return -EINVAL;
729         }
730
731         vb2_set_plane_payload(&buf->vb, 0, size);
732
733         buf->fmt = dev->fmt;
734
735         precalculate_bars(dev);
736         precalculate_line(dev);
737
738         return 0;
739 }
740
741 static int buffer_finish(struct vb2_buffer *vb)
742 {
743         struct vivi_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
744         dprintk(dev, 1, "%s\n", __func__);
745         return 0;
746 }
747
748 static void buffer_cleanup(struct vb2_buffer *vb)
749 {
750         struct vivi_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
751         dprintk(dev, 1, "%s\n", __func__);
752
753 }
754
755 static void buffer_queue(struct vb2_buffer *vb)
756 {
757         struct vivi_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
758         struct vivi_buffer *buf = container_of(vb, struct vivi_buffer, vb);
759         struct vivi_dmaqueue *vidq = &dev->vidq;
760         unsigned long flags = 0;
761
762         dprintk(dev, 1, "%s\n", __func__);
763
764         spin_lock_irqsave(&dev->slock, flags);
765         list_add_tail(&buf->list, &vidq->active);
766         spin_unlock_irqrestore(&dev->slock, flags);
767 }
768
769 static int start_streaming(struct vb2_queue *vq, unsigned int count)
770 {
771         struct vivi_dev *dev = vb2_get_drv_priv(vq);
772         dprintk(dev, 1, "%s\n", __func__);
773         return vivi_start_generating(dev);
774 }
775
776 /* abort streaming and wait for last buffer */
777 static int stop_streaming(struct vb2_queue *vq)
778 {
779         struct vivi_dev *dev = vb2_get_drv_priv(vq);
780         dprintk(dev, 1, "%s\n", __func__);
781         vivi_stop_generating(dev);
782         return 0;
783 }
784
785 static void vivi_lock(struct vb2_queue *vq)
786 {
787         struct vivi_dev *dev = vb2_get_drv_priv(vq);
788         mutex_lock(&dev->mutex);
789 }
790
791 static void vivi_unlock(struct vb2_queue *vq)
792 {
793         struct vivi_dev *dev = vb2_get_drv_priv(vq);
794         mutex_unlock(&dev->mutex);
795 }
796
797
798 static struct vb2_ops vivi_video_qops = {
799         .queue_setup            = queue_setup,
800         .buf_init               = buffer_init,
801         .buf_prepare            = buffer_prepare,
802         .buf_finish             = buffer_finish,
803         .buf_cleanup            = buffer_cleanup,
804         .buf_queue              = buffer_queue,
805         .start_streaming        = start_streaming,
806         .stop_streaming         = stop_streaming,
807         .wait_prepare           = vivi_unlock,
808         .wait_finish            = vivi_lock,
809 };
810
811 /* ------------------------------------------------------------------
812         IOCTL vidioc handling
813    ------------------------------------------------------------------*/
814 static int vidioc_querycap(struct file *file, void  *priv,
815                                         struct v4l2_capability *cap)
816 {
817         struct vivi_dev *dev = video_drvdata(file);
818
819         strcpy(cap->driver, "vivi");
820         strcpy(cap->card, "vivi");
821         strlcpy(cap->bus_info, dev->v4l2_dev.name, sizeof(cap->bus_info));
822         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
823                             V4L2_CAP_READWRITE;
824         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
825         return 0;
826 }
827
828 static int vidioc_enum_fmt_vid_cap(struct file *file, void  *priv,
829                                         struct v4l2_fmtdesc *f)
830 {
831         struct vivi_fmt *fmt;
832
833         if (f->index >= ARRAY_SIZE(formats))
834                 return -EINVAL;
835
836         fmt = &formats[f->index];
837
838         strlcpy(f->description, fmt->name, sizeof(f->description));
839         f->pixelformat = fmt->fourcc;
840         return 0;
841 }
842
843 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
844                                         struct v4l2_format *f)
845 {
846         struct vivi_dev *dev = video_drvdata(file);
847
848         f->fmt.pix.width        = dev->width;
849         f->fmt.pix.height       = dev->height;
850         f->fmt.pix.field        = dev->field;
851         f->fmt.pix.pixelformat  = dev->fmt->fourcc;
852         f->fmt.pix.bytesperline =
853                 (f->fmt.pix.width * dev->fmt->depth) >> 3;
854         f->fmt.pix.sizeimage =
855                 f->fmt.pix.height * f->fmt.pix.bytesperline;
856         if (dev->fmt->fourcc == V4L2_PIX_FMT_YUYV ||
857             dev->fmt->fourcc == V4L2_PIX_FMT_UYVY)
858                 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
859         else
860                 f->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
861         return 0;
862 }
863
864 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
865                         struct v4l2_format *f)
866 {
867         struct vivi_dev *dev = video_drvdata(file);
868         struct vivi_fmt *fmt;
869         enum v4l2_field field;
870
871         fmt = get_format(f);
872         if (!fmt) {
873                 dprintk(dev, 1, "Fourcc format (0x%08x) invalid.\n",
874                         f->fmt.pix.pixelformat);
875                 return -EINVAL;
876         }
877
878         field = f->fmt.pix.field;
879
880         if (field == V4L2_FIELD_ANY) {
881                 field = V4L2_FIELD_INTERLACED;
882         } else if (V4L2_FIELD_INTERLACED != field) {
883                 dprintk(dev, 1, "Field type invalid.\n");
884                 return -EINVAL;
885         }
886
887         f->fmt.pix.field = field;
888         v4l_bound_align_image(&f->fmt.pix.width, 48, MAX_WIDTH, 2,
889                               &f->fmt.pix.height, 32, MAX_HEIGHT, 0, 0);
890         f->fmt.pix.bytesperline =
891                 (f->fmt.pix.width * fmt->depth) >> 3;
892         f->fmt.pix.sizeimage =
893                 f->fmt.pix.height * f->fmt.pix.bytesperline;
894         if (fmt->fourcc == V4L2_PIX_FMT_YUYV ||
895             fmt->fourcc == V4L2_PIX_FMT_UYVY)
896                 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
897         else
898                 f->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
899         return 0;
900 }
901
902 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
903                                         struct v4l2_format *f)
904 {
905         struct vivi_dev *dev = video_drvdata(file);
906         struct vb2_queue *q = &dev->vb_vidq;
907
908         int ret = vidioc_try_fmt_vid_cap(file, priv, f);
909         if (ret < 0)
910                 return ret;
911
912         if (vb2_is_streaming(q)) {
913                 dprintk(dev, 1, "%s device busy\n", __func__);
914                 return -EBUSY;
915         }
916
917         dev->fmt = get_format(f);
918         dev->width = f->fmt.pix.width;
919         dev->height = f->fmt.pix.height;
920         dev->field = f->fmt.pix.field;
921
922         return 0;
923 }
924
925 static int vidioc_reqbufs(struct file *file, void *priv,
926                           struct v4l2_requestbuffers *p)
927 {
928         struct vivi_dev *dev = video_drvdata(file);
929         return vb2_reqbufs(&dev->vb_vidq, p);
930 }
931
932 static int vidioc_querybuf(struct file *file, void *priv, struct v4l2_buffer *p)
933 {
934         struct vivi_dev *dev = video_drvdata(file);
935         return vb2_querybuf(&dev->vb_vidq, p);
936 }
937
938 static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)
939 {
940         struct vivi_dev *dev = video_drvdata(file);
941         return vb2_qbuf(&dev->vb_vidq, p);
942 }
943
944 static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
945 {
946         struct vivi_dev *dev = video_drvdata(file);
947         return vb2_dqbuf(&dev->vb_vidq, p, file->f_flags & O_NONBLOCK);
948 }
949
950 static int vidioc_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
951 {
952         struct vivi_dev *dev = video_drvdata(file);
953         return vb2_streamon(&dev->vb_vidq, i);
954 }
955
956 static int vidioc_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
957 {
958         struct vivi_dev *dev = video_drvdata(file);
959         return vb2_streamoff(&dev->vb_vidq, i);
960 }
961
962 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id *i)
963 {
964         return 0;
965 }
966
967 /* only one input in this sample driver */
968 static int vidioc_enum_input(struct file *file, void *priv,
969                                 struct v4l2_input *inp)
970 {
971         if (inp->index >= NUM_INPUTS)
972                 return -EINVAL;
973
974         inp->type = V4L2_INPUT_TYPE_CAMERA;
975         inp->std = V4L2_STD_525_60;
976         sprintf(inp->name, "Camera %u", inp->index);
977         return 0;
978 }
979
980 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
981 {
982         struct vivi_dev *dev = video_drvdata(file);
983
984         *i = dev->input;
985         return 0;
986 }
987
988 static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
989 {
990         struct vivi_dev *dev = video_drvdata(file);
991
992         if (i >= NUM_INPUTS)
993                 return -EINVAL;
994
995         if (i == dev->input)
996                 return 0;
997
998         dev->input = i;
999         precalculate_bars(dev);
1000         precalculate_line(dev);
1001         return 0;
1002 }
1003
1004 /* --- controls ---------------------------------------------- */
1005
1006 static int vivi_g_volatile_ctrl(struct v4l2_ctrl *ctrl)
1007 {
1008         struct vivi_dev *dev = container_of(ctrl->handler, struct vivi_dev, ctrl_handler);
1009
1010         if (ctrl == dev->autogain)
1011                 dev->gain->val = jiffies & 0xff;
1012         return 0;
1013 }
1014
1015 static int vivi_s_ctrl(struct v4l2_ctrl *ctrl)
1016 {
1017         struct vivi_dev *dev = container_of(ctrl->handler, struct vivi_dev, ctrl_handler);
1018
1019         if (ctrl == dev->button)
1020                 dev->button_pressed = 30;
1021         return 0;
1022 }
1023
1024 /* ------------------------------------------------------------------
1025         File operations for the device
1026    ------------------------------------------------------------------*/
1027
1028 static ssize_t
1029 vivi_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
1030 {
1031         struct vivi_dev *dev = video_drvdata(file);
1032
1033         dprintk(dev, 1, "read called\n");
1034         return vb2_read(&dev->vb_vidq, data, count, ppos,
1035                        file->f_flags & O_NONBLOCK);
1036 }
1037
1038 static unsigned int
1039 vivi_poll(struct file *file, struct poll_table_struct *wait)
1040 {
1041         struct vivi_dev *dev = video_drvdata(file);
1042         struct v4l2_fh *fh = file->private_data;
1043         struct vb2_queue *q = &dev->vb_vidq;
1044         unsigned int res;
1045
1046         dprintk(dev, 1, "%s\n", __func__);
1047         res = vb2_poll(q, file, wait);
1048         if (v4l2_event_pending(fh))
1049                 res |= POLLPRI;
1050         else
1051                 poll_wait(file, &fh->wait, wait);
1052         return res;
1053 }
1054
1055 static int vivi_close(struct file *file)
1056 {
1057         struct video_device  *vdev = video_devdata(file);
1058         struct vivi_dev *dev = video_drvdata(file);
1059
1060         dprintk(dev, 1, "close called (dev=%s), file %p\n",
1061                 video_device_node_name(vdev), file);
1062
1063         if (v4l2_fh_is_singular_file(file))
1064                 vb2_queue_release(&dev->vb_vidq);
1065         return v4l2_fh_release(file);
1066 }
1067
1068 static int vivi_mmap(struct file *file, struct vm_area_struct *vma)
1069 {
1070         struct vivi_dev *dev = video_drvdata(file);
1071         int ret;
1072
1073         dprintk(dev, 1, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
1074
1075         ret = vb2_mmap(&dev->vb_vidq, vma);
1076         dprintk(dev, 1, "vma start=0x%08lx, size=%ld, ret=%d\n",
1077                 (unsigned long)vma->vm_start,
1078                 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
1079                 ret);
1080         return ret;
1081 }
1082
1083 static const struct v4l2_ctrl_ops vivi_ctrl_ops = {
1084         .g_volatile_ctrl = vivi_g_volatile_ctrl,
1085         .s_ctrl = vivi_s_ctrl,
1086 };
1087
1088 #define VIVI_CID_CUSTOM_BASE    (V4L2_CID_USER_BASE | 0xf000)
1089
1090 static const struct v4l2_ctrl_config vivi_ctrl_button = {
1091         .ops = &vivi_ctrl_ops,
1092         .id = VIVI_CID_CUSTOM_BASE + 0,
1093         .name = "Button",
1094         .type = V4L2_CTRL_TYPE_BUTTON,
1095 };
1096
1097 static const struct v4l2_ctrl_config vivi_ctrl_boolean = {
1098         .ops = &vivi_ctrl_ops,
1099         .id = VIVI_CID_CUSTOM_BASE + 1,
1100         .name = "Boolean",
1101         .type = V4L2_CTRL_TYPE_BOOLEAN,
1102         .min = 0,
1103         .max = 1,
1104         .step = 1,
1105         .def = 1,
1106 };
1107
1108 static const struct v4l2_ctrl_config vivi_ctrl_int32 = {
1109         .ops = &vivi_ctrl_ops,
1110         .id = VIVI_CID_CUSTOM_BASE + 2,
1111         .name = "Integer 32 Bits",
1112         .type = V4L2_CTRL_TYPE_INTEGER,
1113         .min = 0x80000000,
1114         .max = 0x7fffffff,
1115         .step = 1,
1116 };
1117
1118 static const struct v4l2_ctrl_config vivi_ctrl_int64 = {
1119         .ops = &vivi_ctrl_ops,
1120         .id = VIVI_CID_CUSTOM_BASE + 3,
1121         .name = "Integer 64 Bits",
1122         .type = V4L2_CTRL_TYPE_INTEGER64,
1123 };
1124
1125 static const char * const vivi_ctrl_menu_strings[] = {
1126         "Menu Item 0 (Skipped)",
1127         "Menu Item 1",
1128         "Menu Item 2 (Skipped)",
1129         "Menu Item 3",
1130         "Menu Item 4",
1131         "Menu Item 5 (Skipped)",
1132         NULL,
1133 };
1134
1135 static const struct v4l2_ctrl_config vivi_ctrl_menu = {
1136         .ops = &vivi_ctrl_ops,
1137         .id = VIVI_CID_CUSTOM_BASE + 4,
1138         .name = "Menu",
1139         .type = V4L2_CTRL_TYPE_MENU,
1140         .min = 1,
1141         .max = 4,
1142         .def = 3,
1143         .menu_skip_mask = 0x04,
1144         .qmenu = vivi_ctrl_menu_strings,
1145 };
1146
1147 static const struct v4l2_ctrl_config vivi_ctrl_string = {
1148         .ops = &vivi_ctrl_ops,
1149         .id = VIVI_CID_CUSTOM_BASE + 5,
1150         .name = "String",
1151         .type = V4L2_CTRL_TYPE_STRING,
1152         .min = 2,
1153         .max = 4,
1154         .step = 1,
1155 };
1156
1157 static const struct v4l2_ctrl_config vivi_ctrl_bitmask = {
1158         .ops = &vivi_ctrl_ops,
1159         .id = VIVI_CID_CUSTOM_BASE + 6,
1160         .name = "Bitmask",
1161         .type = V4L2_CTRL_TYPE_BITMASK,
1162         .def = 0x80002000,
1163         .min = 0,
1164         .max = 0x80402010,
1165         .step = 0,
1166 };
1167
1168 static const struct v4l2_file_operations vivi_fops = {
1169         .owner          = THIS_MODULE,
1170         .open           = v4l2_fh_open,
1171         .release        = vivi_close,
1172         .read           = vivi_read,
1173         .poll           = vivi_poll,
1174         .unlocked_ioctl = video_ioctl2, /* V4L2 ioctl handler */
1175         .mmap           = vivi_mmap,
1176 };
1177
1178 static const struct v4l2_ioctl_ops vivi_ioctl_ops = {
1179         .vidioc_querycap      = vidioc_querycap,
1180         .vidioc_enum_fmt_vid_cap  = vidioc_enum_fmt_vid_cap,
1181         .vidioc_g_fmt_vid_cap     = vidioc_g_fmt_vid_cap,
1182         .vidioc_try_fmt_vid_cap   = vidioc_try_fmt_vid_cap,
1183         .vidioc_s_fmt_vid_cap     = vidioc_s_fmt_vid_cap,
1184         .vidioc_reqbufs       = vidioc_reqbufs,
1185         .vidioc_querybuf      = vidioc_querybuf,
1186         .vidioc_qbuf          = vidioc_qbuf,
1187         .vidioc_dqbuf         = vidioc_dqbuf,
1188         .vidioc_s_std         = vidioc_s_std,
1189         .vidioc_enum_input    = vidioc_enum_input,
1190         .vidioc_g_input       = vidioc_g_input,
1191         .vidioc_s_input       = vidioc_s_input,
1192         .vidioc_streamon      = vidioc_streamon,
1193         .vidioc_streamoff     = vidioc_streamoff,
1194         .vidioc_log_status    = v4l2_ctrl_log_status,
1195         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
1196         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
1197 };
1198
1199 static struct video_device vivi_template = {
1200         .name           = "vivi",
1201         .fops           = &vivi_fops,
1202         .ioctl_ops      = &vivi_ioctl_ops,
1203         .release        = video_device_release,
1204
1205         .tvnorms              = V4L2_STD_525_60,
1206         .current_norm         = V4L2_STD_NTSC_M,
1207 };
1208
1209 /* -----------------------------------------------------------------
1210         Initialization and module stuff
1211    ------------------------------------------------------------------*/
1212
1213 static int vivi_release(void)
1214 {
1215         struct vivi_dev *dev;
1216         struct list_head *list;
1217
1218         while (!list_empty(&vivi_devlist)) {
1219                 list = vivi_devlist.next;
1220                 list_del(list);
1221                 dev = list_entry(list, struct vivi_dev, vivi_devlist);
1222
1223                 v4l2_info(&dev->v4l2_dev, "unregistering %s\n",
1224                         video_device_node_name(dev->vfd));
1225                 video_unregister_device(dev->vfd);
1226                 v4l2_device_unregister(&dev->v4l2_dev);
1227                 v4l2_ctrl_handler_free(&dev->ctrl_handler);
1228                 kfree(dev);
1229         }
1230
1231         return 0;
1232 }
1233
1234 static int __init vivi_create_instance(int inst)
1235 {
1236         struct vivi_dev *dev;
1237         struct video_device *vfd;
1238         struct v4l2_ctrl_handler *hdl;
1239         struct vb2_queue *q;
1240         int ret;
1241
1242         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1243         if (!dev)
1244                 return -ENOMEM;
1245
1246         snprintf(dev->v4l2_dev.name, sizeof(dev->v4l2_dev.name),
1247                         "%s-%03d", VIVI_MODULE_NAME, inst);
1248         ret = v4l2_device_register(NULL, &dev->v4l2_dev);
1249         if (ret)
1250                 goto free_dev;
1251
1252         dev->fmt = &formats[0];
1253         dev->width = 640;
1254         dev->height = 480;
1255         hdl = &dev->ctrl_handler;
1256         v4l2_ctrl_handler_init(hdl, 11);
1257         dev->volume = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,
1258                         V4L2_CID_AUDIO_VOLUME, 0, 255, 1, 200);
1259         dev->brightness = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,
1260                         V4L2_CID_BRIGHTNESS, 0, 255, 1, 127);
1261         dev->contrast = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,
1262                         V4L2_CID_CONTRAST, 0, 255, 1, 16);
1263         dev->saturation = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,
1264                         V4L2_CID_SATURATION, 0, 255, 1, 127);
1265         dev->hue = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,
1266                         V4L2_CID_HUE, -128, 127, 1, 0);
1267         dev->autogain = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,
1268                         V4L2_CID_AUTOGAIN, 0, 1, 1, 1);
1269         dev->gain = v4l2_ctrl_new_std(hdl, &vivi_ctrl_ops,
1270                         V4L2_CID_GAIN, 0, 255, 1, 100);
1271         dev->button = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_button, NULL);
1272         dev->int32 = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_int32, NULL);
1273         dev->int64 = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_int64, NULL);
1274         dev->boolean = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_boolean, NULL);
1275         dev->menu = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_menu, NULL);
1276         dev->string = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_string, NULL);
1277         dev->bitmask = v4l2_ctrl_new_custom(hdl, &vivi_ctrl_bitmask, NULL);
1278         if (hdl->error) {
1279                 ret = hdl->error;
1280                 goto unreg_dev;
1281         }
1282         v4l2_ctrl_auto_cluster(2, &dev->autogain, 0, true);
1283         dev->v4l2_dev.ctrl_handler = hdl;
1284
1285         /* initialize locks */
1286         spin_lock_init(&dev->slock);
1287
1288         /* initialize queue */
1289         q = &dev->vb_vidq;
1290         memset(q, 0, sizeof(dev->vb_vidq));
1291         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1292         q->io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ;
1293         q->drv_priv = dev;
1294         q->buf_struct_size = sizeof(struct vivi_buffer);
1295         q->ops = &vivi_video_qops;
1296         q->mem_ops = &vb2_vmalloc_memops;
1297
1298         vb2_queue_init(q);
1299
1300         mutex_init(&dev->mutex);
1301
1302         /* init video dma queues */
1303         INIT_LIST_HEAD(&dev->vidq.active);
1304         init_waitqueue_head(&dev->vidq.wq);
1305
1306         ret = -ENOMEM;
1307         vfd = video_device_alloc();
1308         if (!vfd)
1309                 goto unreg_dev;
1310
1311         *vfd = vivi_template;
1312         vfd->debug = debug;
1313         vfd->v4l2_dev = &dev->v4l2_dev;
1314         set_bit(V4L2_FL_USE_FH_PRIO, &vfd->flags);
1315
1316         /*
1317          * Provide a mutex to v4l2 core. It will be used to protect
1318          * all fops and v4l2 ioctls.
1319          */
1320         vfd->lock = &dev->mutex;
1321
1322         ret = video_register_device(vfd, VFL_TYPE_GRABBER, video_nr);
1323         if (ret < 0)
1324                 goto rel_vdev;
1325
1326         video_set_drvdata(vfd, dev);
1327
1328         /* Now that everything is fine, let's add it to device list */
1329         list_add_tail(&dev->vivi_devlist, &vivi_devlist);
1330
1331         if (video_nr != -1)
1332                 video_nr++;
1333
1334         dev->vfd = vfd;
1335         v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n",
1336                   video_device_node_name(vfd));
1337         return 0;
1338
1339 rel_vdev:
1340         video_device_release(vfd);
1341 unreg_dev:
1342         v4l2_ctrl_handler_free(hdl);
1343         v4l2_device_unregister(&dev->v4l2_dev);
1344 free_dev:
1345         kfree(dev);
1346         return ret;
1347 }
1348
1349 /* This routine allocates from 1 to n_devs virtual drivers.
1350
1351    The real maximum number of virtual drivers will depend on how many drivers
1352    will succeed. This is limited to the maximum number of devices that
1353    videodev supports, which is equal to VIDEO_NUM_DEVICES.
1354  */
1355 static int __init vivi_init(void)
1356 {
1357         const struct font_desc *font = find_font("VGA8x16");
1358         int ret = 0, i;
1359
1360         if (font == NULL) {
1361                 printk(KERN_ERR "vivi: could not find font\n");
1362                 return -ENODEV;
1363         }
1364         font8x16 = font->data;
1365
1366         if (n_devs <= 0)
1367                 n_devs = 1;
1368
1369         for (i = 0; i < n_devs; i++) {
1370                 ret = vivi_create_instance(i);
1371                 if (ret) {
1372                         /* If some instantiations succeeded, keep driver */
1373                         if (i)
1374                                 ret = 0;
1375                         break;
1376                 }
1377         }
1378
1379         if (ret < 0) {
1380                 printk(KERN_ERR "vivi: error %d while loading driver\n", ret);
1381                 return ret;
1382         }
1383
1384         printk(KERN_INFO "Video Technology Magazine Virtual Video "
1385                         "Capture Board ver %s successfully loaded.\n",
1386                         VIVI_VERSION);
1387
1388         /* n_devs will reflect the actual number of allocated devices */
1389         n_devs = i;
1390
1391         return ret;
1392 }
1393
1394 static void __exit vivi_exit(void)
1395 {
1396         vivi_release();
1397 }
1398
1399 module_init(vivi_init);
1400 module_exit(vivi_exit);