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
get_format(struct v4l2_format * f)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 */
precalculate_bars(struct vivi_dev * dev)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
gen_twopix(struct vivi_dev * dev,u8 * buf,int colorpos)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
precalculate_line(struct vivi_dev * dev)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
gen_text(struct vivi_dev * dev,char * basep,int y,int x,char * text)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
vivi_fillbuff(struct vivi_dev * dev,struct vivi_buffer * buf)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
vivi_thread_tick(struct vivi_dev * dev)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
vivi_sleep(struct vivi_dev * dev)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
vivi_thread(void * data)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
vivi_start_generating(struct vivi_dev * dev)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
vivi_stop_generating(struct vivi_dev * dev)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 ------------------------------------------------------------------*/
queue_setup(struct vb2_queue * vq,const struct v4l2_format * fmt,unsigned int * nbuffers,unsigned int * nplanes,unsigned int sizes[],void * alloc_ctxs[])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
buffer_init(struct vb2_buffer * vb)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
buffer_prepare(struct vb2_buffer * vb)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
buffer_finish(struct vb2_buffer * vb)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
buffer_cleanup(struct vb2_buffer * vb)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
buffer_queue(struct vb2_buffer * vb)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
start_streaming(struct vb2_queue * vq,unsigned int count)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 */
stop_streaming(struct vb2_queue * vq)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
vivi_lock(struct vb2_queue * vq)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
vivi_unlock(struct vb2_queue * vq)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 ------------------------------------------------------------------*/
vidioc_querycap(struct file * file,void * priv,struct v4l2_capability * cap)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
vidioc_enum_fmt_vid_cap(struct file * file,void * priv,struct v4l2_fmtdesc * f)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
vidioc_g_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)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
vidioc_try_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)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
vidioc_s_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)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
vidioc_reqbufs(struct file * file,void * priv,struct v4l2_requestbuffers * p)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
vidioc_querybuf(struct file * file,void * priv,struct v4l2_buffer * p)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
vidioc_qbuf(struct file * file,void * priv,struct v4l2_buffer * p)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
vidioc_dqbuf(struct file * file,void * priv,struct v4l2_buffer * p)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
vidioc_streamon(struct file * file,void * priv,enum v4l2_buf_type i)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
vidioc_streamoff(struct file * file,void * priv,enum v4l2_buf_type i)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
vidioc_s_std(struct file * file,void * priv,v4l2_std_id * i)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 */
vidioc_enum_input(struct file * file,void * priv,struct v4l2_input * inp)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
vidioc_g_input(struct file * file,void * priv,unsigned int * i)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
vidioc_s_input(struct file * file,void * priv,unsigned int i)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
vivi_g_volatile_ctrl(struct v4l2_ctrl * ctrl)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
vivi_s_ctrl(struct v4l2_ctrl * ctrl)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
vivi_read(struct file * file,char __user * data,size_t count,loff_t * ppos)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
vivi_poll(struct file * file,struct poll_table_struct * wait)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
vivi_close(struct file * file)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
vivi_mmap(struct file * file,struct vm_area_struct * vma)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
vivi_release(void)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
vivi_create_instance(int inst)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 */
vivi_init(void)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
vivi_exit(void)1394 static void __exit vivi_exit(void)
1395 {
1396 vivi_release();
1397 }
1398
1399 module_init(vivi_init);
1400 module_exit(vivi_exit);
1401