1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * A virtual v4l2-mem2mem example device.
4  *
5  * This is a virtual device driver for testing mem-to-mem videobuf framework.
6  * It simulates a device that uses memory buffers for both source and
7  * destination, processes the data and issues an "irq" (simulated by a delayed
8  * workqueue).
9  * The device is capable of multi-instance, multi-buffer-per-transaction
10  * operation (via the mem2mem framework).
11  *
12  * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd.
13  * Pawel Osciak, <pawel@osciak.com>
14  * Marek Szyprowski, <m.szyprowski@samsung.com>
15  *
16  * This program is free software; you can redistribute it and/or modify
17  * it under the terms of the GNU General Public License as published by the
18  * Free Software Foundation; either version 2 of the
19  * License, or (at your option) any later version
20  */
21 #include <linux/module.h>
22 #include <linux/delay.h>
23 #include <linux/fs.h>
24 #include <linux/sched.h>
25 #include <linux/slab.h>
26 
27 #include <linux/platform_device.h>
28 #include <media/v4l2-mem2mem.h>
29 #include <media/v4l2-device.h>
30 #include <media/v4l2-ioctl.h>
31 #include <media/v4l2-ctrls.h>
32 #include <media/v4l2-event.h>
33 #include <media/videobuf2-vmalloc.h>
34 
35 MODULE_DESCRIPTION("Virtual device for mem2mem framework testing");
36 MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>");
37 MODULE_LICENSE("GPL");
38 MODULE_VERSION("0.2");
39 MODULE_ALIAS("mem2mem_testdev");
40 
41 static unsigned int debug;
42 module_param(debug, uint, 0644);
43 MODULE_PARM_DESC(debug, "debug level");
44 
45 /* Default transaction time in msec */
46 static unsigned int default_transtime = 40; /* Max 25 fps */
47 module_param(default_transtime, uint, 0644);
48 MODULE_PARM_DESC(default_transtime, "default transaction time in ms");
49 
50 #define MIN_W 32
51 #define MIN_H 32
52 #define MAX_W 640
53 #define MAX_H 480
54 
55 /* Pixel alignment for non-bayer formats */
56 #define WIDTH_ALIGN 2
57 #define HEIGHT_ALIGN 1
58 
59 /* Pixel alignment for bayer formats */
60 #define BAYER_WIDTH_ALIGN  2
61 #define BAYER_HEIGHT_ALIGN 2
62 
63 /* Flags that indicate a format can be used for capture/output */
64 #define MEM2MEM_CAPTURE	BIT(0)
65 #define MEM2MEM_OUTPUT	BIT(1)
66 
67 #define MEM2MEM_NAME		"vim2m"
68 
69 /* Per queue */
70 #define MEM2MEM_DEF_NUM_BUFS	VIDEO_MAX_FRAME
71 /* In bytes, per queue */
72 #define MEM2MEM_VID_MEM_LIMIT	(16 * 1024 * 1024)
73 
74 /* Flags that indicate processing mode */
75 #define MEM2MEM_HFLIP	BIT(0)
76 #define MEM2MEM_VFLIP	BIT(1)
77 
78 #define dprintk(dev, lvl, fmt, arg...) \
79 	v4l2_dbg(lvl, debug, &(dev)->v4l2_dev, "%s: " fmt, __func__, ## arg)
80 
81 static void vim2m_dev_release(struct device *dev)
82 {}
83 
84 static struct platform_device vim2m_pdev = {
85 	.name		= MEM2MEM_NAME,
86 	.dev.release	= vim2m_dev_release,
87 };
88 
89 struct vim2m_fmt {
90 	u32	fourcc;
91 	int	depth;
92 	/* Types the format can be used for */
93 	u32     types;
94 };
95 
96 static struct vim2m_fmt formats[] = {
97 	{
98 		.fourcc	= V4L2_PIX_FMT_RGB565,  /* rrrrrggg gggbbbbb */
99 		.depth	= 16,
100 		.types  = MEM2MEM_CAPTURE | MEM2MEM_OUTPUT,
101 	}, {
102 		.fourcc	= V4L2_PIX_FMT_RGB565X, /* gggbbbbb rrrrrggg */
103 		.depth	= 16,
104 		.types  = MEM2MEM_CAPTURE | MEM2MEM_OUTPUT,
105 	}, {
106 		.fourcc	= V4L2_PIX_FMT_RGB24,
107 		.depth	= 24,
108 		.types  = MEM2MEM_CAPTURE | MEM2MEM_OUTPUT,
109 	}, {
110 		.fourcc	= V4L2_PIX_FMT_BGR24,
111 		.depth	= 24,
112 		.types  = MEM2MEM_CAPTURE | MEM2MEM_OUTPUT,
113 	}, {
114 		.fourcc	= V4L2_PIX_FMT_YUYV,
115 		.depth	= 16,
116 		.types  = MEM2MEM_CAPTURE,
117 	}, {
118 		.fourcc	= V4L2_PIX_FMT_SBGGR8,
119 		.depth	= 8,
120 		.types  = MEM2MEM_CAPTURE,
121 	}, {
122 		.fourcc	= V4L2_PIX_FMT_SGBRG8,
123 		.depth	= 8,
124 		.types  = MEM2MEM_CAPTURE,
125 	}, {
126 		.fourcc	= V4L2_PIX_FMT_SGRBG8,
127 		.depth	= 8,
128 		.types  = MEM2MEM_CAPTURE,
129 	}, {
130 		.fourcc	= V4L2_PIX_FMT_SRGGB8,
131 		.depth	= 8,
132 		.types  = MEM2MEM_CAPTURE,
133 	},
134 };
135 
136 #define NUM_FORMATS ARRAY_SIZE(formats)
137 
138 /* Per-queue, driver-specific private data */
139 struct vim2m_q_data {
140 	unsigned int		width;
141 	unsigned int		height;
142 	unsigned int		sizeimage;
143 	unsigned int		sequence;
144 	struct vim2m_fmt	*fmt;
145 };
146 
147 enum {
148 	V4L2_M2M_SRC = 0,
149 	V4L2_M2M_DST = 1,
150 };
151 
152 #define V4L2_CID_TRANS_TIME_MSEC	(V4L2_CID_USER_BASE + 0x1000)
153 #define V4L2_CID_TRANS_NUM_BUFS		(V4L2_CID_USER_BASE + 0x1001)
154 
155 static struct vim2m_fmt *find_format(u32 fourcc)
156 {
157 	struct vim2m_fmt *fmt;
158 	unsigned int k;
159 
160 	for (k = 0; k < NUM_FORMATS; k++) {
161 		fmt = &formats[k];
162 		if (fmt->fourcc == fourcc)
163 			break;
164 	}
165 
166 	if (k == NUM_FORMATS)
167 		return NULL;
168 
169 	return &formats[k];
170 }
171 
172 static void get_alignment(u32 fourcc,
173 			  unsigned int *walign, unsigned int *halign)
174 {
175 	switch (fourcc) {
176 	case V4L2_PIX_FMT_SBGGR8:
177 	case V4L2_PIX_FMT_SGBRG8:
178 	case V4L2_PIX_FMT_SGRBG8:
179 	case V4L2_PIX_FMT_SRGGB8:
180 		*walign = BAYER_WIDTH_ALIGN;
181 		*halign = BAYER_HEIGHT_ALIGN;
182 		return;
183 	default:
184 		*walign = WIDTH_ALIGN;
185 		*halign = HEIGHT_ALIGN;
186 		return;
187 	}
188 }
189 
190 struct vim2m_dev {
191 	struct v4l2_device	v4l2_dev;
192 	struct video_device	vfd;
193 #ifdef CONFIG_MEDIA_CONTROLLER
194 	struct media_device	mdev;
195 #endif
196 
197 	atomic_t		num_inst;
198 	struct mutex		dev_mutex;
199 
200 	struct v4l2_m2m_dev	*m2m_dev;
201 };
202 
203 struct vim2m_ctx {
204 	struct v4l2_fh		fh;
205 	struct vim2m_dev	*dev;
206 
207 	struct v4l2_ctrl_handler hdl;
208 
209 	/* Processed buffers in this transaction */
210 	u8			num_processed;
211 
212 	/* Transaction length (i.e. how many buffers per transaction) */
213 	u32			translen;
214 	/* Transaction time (i.e. simulated processing time) in milliseconds */
215 	u32			transtime;
216 
217 	struct mutex		vb_mutex;
218 	struct delayed_work	work_run;
219 
220 	/* Abort requested by m2m */
221 	int			aborting;
222 
223 	/* Processing mode */
224 	int			mode;
225 
226 	enum v4l2_colorspace	colorspace;
227 	enum v4l2_ycbcr_encoding ycbcr_enc;
228 	enum v4l2_xfer_func	xfer_func;
229 	enum v4l2_quantization	quant;
230 
231 	/* Source and destination queue data */
232 	struct vim2m_q_data   q_data[2];
233 };
234 
235 static inline struct vim2m_ctx *file2ctx(struct file *file)
236 {
237 	return container_of(file->private_data, struct vim2m_ctx, fh);
238 }
239 
240 static struct vim2m_q_data *get_q_data(struct vim2m_ctx *ctx,
241 				       enum v4l2_buf_type type)
242 {
243 	switch (type) {
244 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
245 		return &ctx->q_data[V4L2_M2M_SRC];
246 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
247 		return &ctx->q_data[V4L2_M2M_DST];
248 	default:
249 		return NULL;
250 	}
251 }
252 
253 static const char *type_name(enum v4l2_buf_type type)
254 {
255 	switch (type) {
256 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
257 		return "Output";
258 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
259 		return "Capture";
260 	default:
261 		return "Invalid";
262 	}
263 }
264 
265 #define CLIP(__color) \
266 	(u8)(((__color) > 0xff) ? 0xff : (((__color) < 0) ? 0 : (__color)))
267 
268 static void copy_line(struct vim2m_q_data *q_data_out,
269 		      u8 *src, u8 *dst, bool reverse)
270 {
271 	int x, depth = q_data_out->fmt->depth >> 3;
272 
273 	if (!reverse) {
274 		memcpy(dst, src, q_data_out->width * depth);
275 	} else {
276 		for (x = 0; x < q_data_out->width >> 1; x++) {
277 			memcpy(dst, src, depth);
278 			memcpy(dst + depth, src - depth, depth);
279 			src -= depth << 1;
280 			dst += depth << 1;
281 		}
282 		return;
283 	}
284 }
285 
286 static void copy_two_pixels(struct vim2m_q_data *q_data_in,
287 			    struct vim2m_q_data *q_data_out,
288 			    u8 *src[2], u8 **dst, int ypos, bool reverse)
289 {
290 	struct vim2m_fmt *out = q_data_out->fmt;
291 	struct vim2m_fmt *in = q_data_in->fmt;
292 	u8 _r[2], _g[2], _b[2], *r, *g, *b;
293 	int i;
294 
295 	/* Step 1: read two consecutive pixels from src pointer */
296 
297 	r = _r;
298 	g = _g;
299 	b = _b;
300 
301 	switch (in->fourcc) {
302 	case V4L2_PIX_FMT_RGB565: /* rrrrrggg gggbbbbb */
303 		for (i = 0; i < 2; i++) {
304 			u16 pix = le16_to_cpu(*(__le16 *)(src[i]));
305 
306 			*r++ = (u8)(((pix & 0xf800) >> 11) << 3) | 0x07;
307 			*g++ = (u8)((((pix & 0x07e0) >> 5)) << 2) | 0x03;
308 			*b++ = (u8)((pix & 0x1f) << 3) | 0x07;
309 		}
310 		break;
311 	case V4L2_PIX_FMT_RGB565X: /* gggbbbbb rrrrrggg */
312 		for (i = 0; i < 2; i++) {
313 			u16 pix = be16_to_cpu(*(__be16 *)(src[i]));
314 
315 			*r++ = (u8)(((pix & 0xf800) >> 11) << 3) | 0x07;
316 			*g++ = (u8)((((pix & 0x07e0) >> 5)) << 2) | 0x03;
317 			*b++ = (u8)((pix & 0x1f) << 3) | 0x07;
318 		}
319 		break;
320 	default:
321 	case V4L2_PIX_FMT_RGB24:
322 		for (i = 0; i < 2; i++) {
323 			*r++ = src[i][0];
324 			*g++ = src[i][1];
325 			*b++ = src[i][2];
326 		}
327 		break;
328 	case V4L2_PIX_FMT_BGR24:
329 		for (i = 0; i < 2; i++) {
330 			*b++ = src[i][0];
331 			*g++ = src[i][1];
332 			*r++ = src[i][2];
333 		}
334 		break;
335 	}
336 
337 	/* Step 2: store two consecutive points, reversing them if needed */
338 
339 	r = _r;
340 	g = _g;
341 	b = _b;
342 
343 	switch (out->fourcc) {
344 	case V4L2_PIX_FMT_RGB565: /* rrrrrggg gggbbbbb */
345 		for (i = 0; i < 2; i++) {
346 			u16 pix;
347 			__le16 *dst_pix = (__le16 *)*dst;
348 
349 			pix = ((*r << 8) & 0xf800) | ((*g << 3) & 0x07e0) |
350 			      (*b >> 3);
351 
352 			*dst_pix = cpu_to_le16(pix);
353 
354 			*dst += 2;
355 		}
356 		return;
357 	case V4L2_PIX_FMT_RGB565X: /* gggbbbbb rrrrrggg */
358 		for (i = 0; i < 2; i++) {
359 			u16 pix;
360 			__be16 *dst_pix = (__be16 *)*dst;
361 
362 			pix = ((*r << 8) & 0xf800) | ((*g << 3) & 0x07e0) |
363 			      (*b >> 3);
364 
365 			*dst_pix = cpu_to_be16(pix);
366 
367 			*dst += 2;
368 		}
369 		return;
370 	case V4L2_PIX_FMT_RGB24:
371 		for (i = 0; i < 2; i++) {
372 			*(*dst)++ = *r++;
373 			*(*dst)++ = *g++;
374 			*(*dst)++ = *b++;
375 		}
376 		return;
377 	case V4L2_PIX_FMT_BGR24:
378 		for (i = 0; i < 2; i++) {
379 			*(*dst)++ = *b++;
380 			*(*dst)++ = *g++;
381 			*(*dst)++ = *r++;
382 		}
383 		return;
384 	case V4L2_PIX_FMT_YUYV:
385 	default:
386 	{
387 		u8 y, y1, u, v;
388 
389 		y = ((8453  * (*r) + 16594 * (*g) +  3223 * (*b)
390 		     + 524288) >> 15);
391 		u = ((-4878 * (*r) - 9578  * (*g) + 14456 * (*b)
392 		     + 4210688) >> 15);
393 		v = ((14456 * (*r++) - 12105 * (*g++) - 2351 * (*b++)
394 		     + 4210688) >> 15);
395 		y1 = ((8453 * (*r) + 16594 * (*g) +  3223 * (*b)
396 		     + 524288) >> 15);
397 
398 		*(*dst)++ = y;
399 		*(*dst)++ = u;
400 
401 		*(*dst)++ = y1;
402 		*(*dst)++ = v;
403 		return;
404 	}
405 	case V4L2_PIX_FMT_SBGGR8:
406 		if (!(ypos & 1)) {
407 			*(*dst)++ = *b;
408 			*(*dst)++ = *++g;
409 		} else {
410 			*(*dst)++ = *g;
411 			*(*dst)++ = *++r;
412 		}
413 		return;
414 	case V4L2_PIX_FMT_SGBRG8:
415 		if (!(ypos & 1)) {
416 			*(*dst)++ = *g;
417 			*(*dst)++ = *++b;
418 		} else {
419 			*(*dst)++ = *r;
420 			*(*dst)++ = *++g;
421 		}
422 		return;
423 	case V4L2_PIX_FMT_SGRBG8:
424 		if (!(ypos & 1)) {
425 			*(*dst)++ = *g;
426 			*(*dst)++ = *++r;
427 		} else {
428 			*(*dst)++ = *b;
429 			*(*dst)++ = *++g;
430 		}
431 		return;
432 	case V4L2_PIX_FMT_SRGGB8:
433 		if (!(ypos & 1)) {
434 			*(*dst)++ = *r;
435 			*(*dst)++ = *++g;
436 		} else {
437 			*(*dst)++ = *g;
438 			*(*dst)++ = *++b;
439 		}
440 		return;
441 	}
442 }
443 
444 static int device_process(struct vim2m_ctx *ctx,
445 			  struct vb2_v4l2_buffer *in_vb,
446 			  struct vb2_v4l2_buffer *out_vb)
447 {
448 	struct vim2m_dev *dev = ctx->dev;
449 	struct vim2m_q_data *q_data_in, *q_data_out;
450 	u8 *p_in, *p_line, *p_in_x[2], *p, *p_out;
451 	unsigned int width, height, bytesperline, bytes_per_pixel;
452 	unsigned int x, y, y_in, y_out, x_int, x_fract, x_err, x_offset;
453 	int start, end, step;
454 
455 	q_data_in = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
456 	if (!q_data_in)
457 		return 0;
458 	bytesperline = (q_data_in->width * q_data_in->fmt->depth) >> 3;
459 	bytes_per_pixel = q_data_in->fmt->depth >> 3;
460 
461 	q_data_out = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
462 	if (!q_data_out)
463 		return 0;
464 
465 	/* As we're doing scaling, use the output dimensions here */
466 	height = q_data_out->height;
467 	width = q_data_out->width;
468 
469 	p_in = vb2_plane_vaddr(&in_vb->vb2_buf, 0);
470 	p_out = vb2_plane_vaddr(&out_vb->vb2_buf, 0);
471 	if (!p_in || !p_out) {
472 		v4l2_err(&dev->v4l2_dev,
473 			 "Acquiring kernel pointers to buffers failed\n");
474 		return -EFAULT;
475 	}
476 
477 	out_vb->sequence = q_data_out->sequence++;
478 	in_vb->sequence = q_data_in->sequence++;
479 	v4l2_m2m_buf_copy_metadata(in_vb, out_vb, true);
480 
481 	if (ctx->mode & MEM2MEM_VFLIP) {
482 		start = height - 1;
483 		end = -1;
484 		step = -1;
485 	} else {
486 		start = 0;
487 		end = height;
488 		step = 1;
489 	}
490 	y_out = 0;
491 
492 	/*
493 	 * When format and resolution are identical,
494 	 * we can use a faster copy logic
495 	 */
496 	if (q_data_in->fmt->fourcc == q_data_out->fmt->fourcc &&
497 	    q_data_in->width == q_data_out->width &&
498 	    q_data_in->height == q_data_out->height) {
499 		for (y = start; y != end; y += step, y_out++) {
500 			p = p_in + (y * bytesperline);
501 			if (ctx->mode & MEM2MEM_HFLIP)
502 				p += bytesperline - (q_data_in->fmt->depth >> 3);
503 
504 			copy_line(q_data_out, p, p_out,
505 				  ctx->mode & MEM2MEM_HFLIP);
506 
507 			p_out += bytesperline;
508 		}
509 		return 0;
510 	}
511 
512 	/* Slower algorithm with format conversion, hflip, vflip and scaler */
513 
514 	/* To speed scaler up, use Bresenham for X dimension */
515 	x_int = q_data_in->width / q_data_out->width;
516 	x_fract = q_data_in->width % q_data_out->width;
517 
518 	for (y = start; y != end; y += step, y_out++) {
519 		y_in = (y * q_data_in->height) / q_data_out->height;
520 		x_offset = 0;
521 		x_err = 0;
522 
523 		p_line = p_in + (y_in * bytesperline);
524 		if (ctx->mode & MEM2MEM_HFLIP)
525 			p_line += bytesperline - (q_data_in->fmt->depth >> 3);
526 		p_in_x[0] = p_line;
527 
528 		for (x = 0; x < width >> 1; x++) {
529 			x_offset += x_int;
530 			x_err += x_fract;
531 			if (x_err > width) {
532 				x_offset++;
533 				x_err -= width;
534 			}
535 
536 			if (ctx->mode & MEM2MEM_HFLIP)
537 				p_in_x[1] = p_line - x_offset * bytes_per_pixel;
538 			else
539 				p_in_x[1] = p_line + x_offset * bytes_per_pixel;
540 
541 			copy_two_pixels(q_data_in, q_data_out,
542 					p_in_x, &p_out, y_out,
543 					ctx->mode & MEM2MEM_HFLIP);
544 
545 			/* Calculate the next p_in_x0 */
546 			x_offset += x_int;
547 			x_err += x_fract;
548 			if (x_err > width) {
549 				x_offset++;
550 				x_err -= width;
551 			}
552 
553 			if (ctx->mode & MEM2MEM_HFLIP)
554 				p_in_x[0] = p_line - x_offset * bytes_per_pixel;
555 			else
556 				p_in_x[0] = p_line + x_offset * bytes_per_pixel;
557 		}
558 	}
559 
560 	return 0;
561 }
562 
563 /*
564  * mem2mem callbacks
565  */
566 
567 /*
568  * job_ready() - check whether an instance is ready to be scheduled to run
569  */
570 static int job_ready(void *priv)
571 {
572 	struct vim2m_ctx *ctx = priv;
573 
574 	if (v4l2_m2m_num_src_bufs_ready(ctx->fh.m2m_ctx) < ctx->translen
575 	    || v4l2_m2m_num_dst_bufs_ready(ctx->fh.m2m_ctx) < ctx->translen) {
576 		dprintk(ctx->dev, 1, "Not enough buffers available\n");
577 		return 0;
578 	}
579 
580 	return 1;
581 }
582 
583 static void job_abort(void *priv)
584 {
585 	struct vim2m_ctx *ctx = priv;
586 
587 	/* Will cancel the transaction in the next interrupt handler */
588 	ctx->aborting = 1;
589 }
590 
591 /* device_run() - prepares and starts the device
592  *
593  * This simulates all the immediate preparations required before starting
594  * a device. This will be called by the framework when it decides to schedule
595  * a particular instance.
596  */
597 static void device_run(void *priv)
598 {
599 	struct vim2m_ctx *ctx = priv;
600 	struct vb2_v4l2_buffer *src_buf, *dst_buf;
601 
602 	src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
603 	dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
604 
605 	/* Apply request controls if any */
606 	v4l2_ctrl_request_setup(src_buf->vb2_buf.req_obj.req,
607 				&ctx->hdl);
608 
609 	device_process(ctx, src_buf, dst_buf);
610 
611 	/* Complete request controls if any */
612 	v4l2_ctrl_request_complete(src_buf->vb2_buf.req_obj.req,
613 				   &ctx->hdl);
614 
615 	/* Run delayed work, which simulates a hardware irq  */
616 	schedule_delayed_work(&ctx->work_run, msecs_to_jiffies(ctx->transtime));
617 }
618 
619 static void device_work(struct work_struct *w)
620 {
621 	struct vim2m_ctx *curr_ctx;
622 	struct vim2m_dev *vim2m_dev;
623 	struct vb2_v4l2_buffer *src_vb, *dst_vb;
624 
625 	curr_ctx = container_of(w, struct vim2m_ctx, work_run.work);
626 
627 	if (!curr_ctx) {
628 		pr_err("Instance released before the end of transaction\n");
629 		return;
630 	}
631 
632 	vim2m_dev = curr_ctx->dev;
633 
634 	src_vb = v4l2_m2m_src_buf_remove(curr_ctx->fh.m2m_ctx);
635 	dst_vb = v4l2_m2m_dst_buf_remove(curr_ctx->fh.m2m_ctx);
636 
637 	curr_ctx->num_processed++;
638 
639 	v4l2_m2m_buf_done(src_vb, VB2_BUF_STATE_DONE);
640 	v4l2_m2m_buf_done(dst_vb, VB2_BUF_STATE_DONE);
641 
642 	if (curr_ctx->num_processed == curr_ctx->translen
643 	    || curr_ctx->aborting) {
644 		dprintk(curr_ctx->dev, 2, "Finishing capture buffer fill\n");
645 		curr_ctx->num_processed = 0;
646 		v4l2_m2m_job_finish(vim2m_dev->m2m_dev, curr_ctx->fh.m2m_ctx);
647 	} else {
648 		device_run(curr_ctx);
649 	}
650 }
651 
652 /*
653  * video ioctls
654  */
655 static int vidioc_querycap(struct file *file, void *priv,
656 			   struct v4l2_capability *cap)
657 {
658 	strscpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver));
659 	strscpy(cap->card, MEM2MEM_NAME, sizeof(cap->card));
660 	snprintf(cap->bus_info, sizeof(cap->bus_info),
661 		 "platform:%s", MEM2MEM_NAME);
662 	return 0;
663 }
664 
665 static int enum_fmt(struct v4l2_fmtdesc *f, u32 type)
666 {
667 	int i, num;
668 	struct vim2m_fmt *fmt;
669 
670 	num = 0;
671 
672 	for (i = 0; i < NUM_FORMATS; ++i) {
673 		if (formats[i].types & type) {
674 			/* index-th format of type type found ? */
675 			if (num == f->index)
676 				break;
677 			/*
678 			 * Correct type but haven't reached our index yet,
679 			 * just increment per-type index
680 			 */
681 			++num;
682 		}
683 	}
684 
685 	if (i < NUM_FORMATS) {
686 		/* Format found */
687 		fmt = &formats[i];
688 		f->pixelformat = fmt->fourcc;
689 		return 0;
690 	}
691 
692 	/* Format not found */
693 	return -EINVAL;
694 }
695 
696 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
697 				   struct v4l2_fmtdesc *f)
698 {
699 	return enum_fmt(f, MEM2MEM_CAPTURE);
700 }
701 
702 static int vidioc_enum_fmt_vid_out(struct file *file, void *priv,
703 				   struct v4l2_fmtdesc *f)
704 {
705 	return enum_fmt(f, MEM2MEM_OUTPUT);
706 }
707 
708 static int vidioc_enum_framesizes(struct file *file, void *priv,
709 				  struct v4l2_frmsizeenum *fsize)
710 {
711 	if (fsize->index != 0)
712 		return -EINVAL;
713 
714 	if (!find_format(fsize->pixel_format))
715 		return -EINVAL;
716 
717 	fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
718 	fsize->stepwise.min_width = MIN_W;
719 	fsize->stepwise.min_height = MIN_H;
720 	fsize->stepwise.max_width = MAX_W;
721 	fsize->stepwise.max_height = MAX_H;
722 
723 	get_alignment(fsize->pixel_format,
724 		      &fsize->stepwise.step_width,
725 		      &fsize->stepwise.step_height);
726 	return 0;
727 }
728 
729 static int vidioc_g_fmt(struct vim2m_ctx *ctx, struct v4l2_format *f)
730 {
731 	struct vb2_queue *vq;
732 	struct vim2m_q_data *q_data;
733 
734 	vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
735 	if (!vq)
736 		return -EINVAL;
737 
738 	q_data = get_q_data(ctx, f->type);
739 	if (!q_data)
740 		return -EINVAL;
741 
742 	f->fmt.pix.width	= q_data->width;
743 	f->fmt.pix.height	= q_data->height;
744 	f->fmt.pix.field	= V4L2_FIELD_NONE;
745 	f->fmt.pix.pixelformat	= q_data->fmt->fourcc;
746 	f->fmt.pix.bytesperline	= (q_data->width * q_data->fmt->depth) >> 3;
747 	f->fmt.pix.sizeimage	= q_data->sizeimage;
748 	f->fmt.pix.colorspace	= ctx->colorspace;
749 	f->fmt.pix.xfer_func	= ctx->xfer_func;
750 	f->fmt.pix.ycbcr_enc	= ctx->ycbcr_enc;
751 	f->fmt.pix.quantization	= ctx->quant;
752 
753 	return 0;
754 }
755 
756 static int vidioc_g_fmt_vid_out(struct file *file, void *priv,
757 				struct v4l2_format *f)
758 {
759 	return vidioc_g_fmt(file2ctx(file), f);
760 }
761 
762 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
763 				struct v4l2_format *f)
764 {
765 	return vidioc_g_fmt(file2ctx(file), f);
766 }
767 
768 static int vidioc_try_fmt(struct v4l2_format *f, struct vim2m_fmt *fmt)
769 {
770 	int walign, halign;
771 	/*
772 	 * V4L2 specification specifies the driver corrects the
773 	 * format struct if any of the dimensions is unsupported
774 	 */
775 	if (f->fmt.pix.height < MIN_H)
776 		f->fmt.pix.height = MIN_H;
777 	else if (f->fmt.pix.height > MAX_H)
778 		f->fmt.pix.height = MAX_H;
779 
780 	if (f->fmt.pix.width < MIN_W)
781 		f->fmt.pix.width = MIN_W;
782 	else if (f->fmt.pix.width > MAX_W)
783 		f->fmt.pix.width = MAX_W;
784 
785 	get_alignment(f->fmt.pix.pixelformat, &walign, &halign);
786 	f->fmt.pix.width &= ~(walign - 1);
787 	f->fmt.pix.height &= ~(halign - 1);
788 	f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
789 	f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
790 	f->fmt.pix.field = V4L2_FIELD_NONE;
791 
792 	return 0;
793 }
794 
795 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
796 				  struct v4l2_format *f)
797 {
798 	struct vim2m_fmt *fmt;
799 	struct vim2m_ctx *ctx = file2ctx(file);
800 
801 	fmt = find_format(f->fmt.pix.pixelformat);
802 	if (!fmt) {
803 		f->fmt.pix.pixelformat = formats[0].fourcc;
804 		fmt = find_format(f->fmt.pix.pixelformat);
805 	}
806 	if (!(fmt->types & MEM2MEM_CAPTURE)) {
807 		v4l2_err(&ctx->dev->v4l2_dev,
808 			 "Fourcc format (0x%08x) invalid.\n",
809 			 f->fmt.pix.pixelformat);
810 		return -EINVAL;
811 	}
812 	f->fmt.pix.colorspace = ctx->colorspace;
813 	f->fmt.pix.xfer_func = ctx->xfer_func;
814 	f->fmt.pix.ycbcr_enc = ctx->ycbcr_enc;
815 	f->fmt.pix.quantization = ctx->quant;
816 
817 	return vidioc_try_fmt(f, fmt);
818 }
819 
820 static int vidioc_try_fmt_vid_out(struct file *file, void *priv,
821 				  struct v4l2_format *f)
822 {
823 	struct vim2m_fmt *fmt;
824 	struct vim2m_ctx *ctx = file2ctx(file);
825 
826 	fmt = find_format(f->fmt.pix.pixelformat);
827 	if (!fmt) {
828 		f->fmt.pix.pixelformat = formats[0].fourcc;
829 		fmt = find_format(f->fmt.pix.pixelformat);
830 	}
831 	if (!(fmt->types & MEM2MEM_OUTPUT)) {
832 		v4l2_err(&ctx->dev->v4l2_dev,
833 			 "Fourcc format (0x%08x) invalid.\n",
834 			 f->fmt.pix.pixelformat);
835 		return -EINVAL;
836 	}
837 	if (!f->fmt.pix.colorspace)
838 		f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709;
839 
840 	return vidioc_try_fmt(f, fmt);
841 }
842 
843 static int vidioc_s_fmt(struct vim2m_ctx *ctx, struct v4l2_format *f)
844 {
845 	struct vim2m_q_data *q_data;
846 	struct vb2_queue *vq;
847 
848 	vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
849 	if (!vq)
850 		return -EINVAL;
851 
852 	q_data = get_q_data(ctx, f->type);
853 	if (!q_data)
854 		return -EINVAL;
855 
856 	if (vb2_is_busy(vq)) {
857 		v4l2_err(&ctx->dev->v4l2_dev, "%s queue busy\n", __func__);
858 		return -EBUSY;
859 	}
860 
861 	q_data->fmt		= find_format(f->fmt.pix.pixelformat);
862 	q_data->width		= f->fmt.pix.width;
863 	q_data->height		= f->fmt.pix.height;
864 	q_data->sizeimage	= q_data->width * q_data->height
865 				* q_data->fmt->depth >> 3;
866 
867 	dprintk(ctx->dev, 1,
868 		"Format for type %s: %dx%d (%d bpp), fmt: %c%c%c%c\n",
869 		type_name(f->type), q_data->width, q_data->height,
870 		q_data->fmt->depth,
871 		(q_data->fmt->fourcc & 0xff),
872 		(q_data->fmt->fourcc >>  8) & 0xff,
873 		(q_data->fmt->fourcc >> 16) & 0xff,
874 		(q_data->fmt->fourcc >> 24) & 0xff);
875 
876 	return 0;
877 }
878 
879 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
880 				struct v4l2_format *f)
881 {
882 	int ret;
883 
884 	ret = vidioc_try_fmt_vid_cap(file, priv, f);
885 	if (ret)
886 		return ret;
887 
888 	return vidioc_s_fmt(file2ctx(file), f);
889 }
890 
891 static int vidioc_s_fmt_vid_out(struct file *file, void *priv,
892 				struct v4l2_format *f)
893 {
894 	struct vim2m_ctx *ctx = file2ctx(file);
895 	int ret;
896 
897 	ret = vidioc_try_fmt_vid_out(file, priv, f);
898 	if (ret)
899 		return ret;
900 
901 	ret = vidioc_s_fmt(file2ctx(file), f);
902 	if (!ret) {
903 		ctx->colorspace = f->fmt.pix.colorspace;
904 		ctx->xfer_func = f->fmt.pix.xfer_func;
905 		ctx->ycbcr_enc = f->fmt.pix.ycbcr_enc;
906 		ctx->quant = f->fmt.pix.quantization;
907 	}
908 	return ret;
909 }
910 
911 static int vim2m_s_ctrl(struct v4l2_ctrl *ctrl)
912 {
913 	struct vim2m_ctx *ctx =
914 		container_of(ctrl->handler, struct vim2m_ctx, hdl);
915 
916 	switch (ctrl->id) {
917 	case V4L2_CID_HFLIP:
918 		if (ctrl->val)
919 			ctx->mode |= MEM2MEM_HFLIP;
920 		else
921 			ctx->mode &= ~MEM2MEM_HFLIP;
922 		break;
923 
924 	case V4L2_CID_VFLIP:
925 		if (ctrl->val)
926 			ctx->mode |= MEM2MEM_VFLIP;
927 		else
928 			ctx->mode &= ~MEM2MEM_VFLIP;
929 		break;
930 
931 	case V4L2_CID_TRANS_TIME_MSEC:
932 		ctx->transtime = ctrl->val;
933 		if (ctx->transtime < 1)
934 			ctx->transtime = 1;
935 		break;
936 
937 	case V4L2_CID_TRANS_NUM_BUFS:
938 		ctx->translen = ctrl->val;
939 		break;
940 
941 	default:
942 		v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n");
943 		return -EINVAL;
944 	}
945 
946 	return 0;
947 }
948 
949 static const struct v4l2_ctrl_ops vim2m_ctrl_ops = {
950 	.s_ctrl = vim2m_s_ctrl,
951 };
952 
953 static const struct v4l2_ioctl_ops vim2m_ioctl_ops = {
954 	.vidioc_querycap	= vidioc_querycap,
955 
956 	.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
957 	.vidioc_enum_framesizes = vidioc_enum_framesizes,
958 	.vidioc_g_fmt_vid_cap	= vidioc_g_fmt_vid_cap,
959 	.vidioc_try_fmt_vid_cap	= vidioc_try_fmt_vid_cap,
960 	.vidioc_s_fmt_vid_cap	= vidioc_s_fmt_vid_cap,
961 
962 	.vidioc_enum_fmt_vid_out = vidioc_enum_fmt_vid_out,
963 	.vidioc_g_fmt_vid_out	= vidioc_g_fmt_vid_out,
964 	.vidioc_try_fmt_vid_out	= vidioc_try_fmt_vid_out,
965 	.vidioc_s_fmt_vid_out	= vidioc_s_fmt_vid_out,
966 
967 	.vidioc_reqbufs		= v4l2_m2m_ioctl_reqbufs,
968 	.vidioc_querybuf	= v4l2_m2m_ioctl_querybuf,
969 	.vidioc_qbuf		= v4l2_m2m_ioctl_qbuf,
970 	.vidioc_dqbuf		= v4l2_m2m_ioctl_dqbuf,
971 	.vidioc_prepare_buf	= v4l2_m2m_ioctl_prepare_buf,
972 	.vidioc_create_bufs	= v4l2_m2m_ioctl_create_bufs,
973 	.vidioc_expbuf		= v4l2_m2m_ioctl_expbuf,
974 
975 	.vidioc_streamon	= v4l2_m2m_ioctl_streamon,
976 	.vidioc_streamoff	= v4l2_m2m_ioctl_streamoff,
977 
978 	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
979 	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
980 };
981 
982 /*
983  * Queue operations
984  */
985 
986 static int vim2m_queue_setup(struct vb2_queue *vq,
987 			     unsigned int *nbuffers,
988 			     unsigned int *nplanes,
989 			     unsigned int sizes[],
990 			     struct device *alloc_devs[])
991 {
992 	struct vim2m_ctx *ctx = vb2_get_drv_priv(vq);
993 	struct vim2m_q_data *q_data;
994 	unsigned int size, count = *nbuffers;
995 
996 	q_data = get_q_data(ctx, vq->type);
997 	if (!q_data)
998 		return -EINVAL;
999 
1000 	size = q_data->width * q_data->height * q_data->fmt->depth >> 3;
1001 
1002 	while (size * count > MEM2MEM_VID_MEM_LIMIT)
1003 		(count)--;
1004 	*nbuffers = count;
1005 
1006 	if (*nplanes)
1007 		return sizes[0] < size ? -EINVAL : 0;
1008 
1009 	*nplanes = 1;
1010 	sizes[0] = size;
1011 
1012 	dprintk(ctx->dev, 1, "%s: get %d buffer(s) of size %d each.\n",
1013 		type_name(vq->type), count, size);
1014 
1015 	return 0;
1016 }
1017 
1018 static int vim2m_buf_out_validate(struct vb2_buffer *vb)
1019 {
1020 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
1021 	struct vim2m_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
1022 
1023 	if (vbuf->field == V4L2_FIELD_ANY)
1024 		vbuf->field = V4L2_FIELD_NONE;
1025 	if (vbuf->field != V4L2_FIELD_NONE) {
1026 		dprintk(ctx->dev, 1, "%s field isn't supported\n", __func__);
1027 		return -EINVAL;
1028 	}
1029 
1030 	return 0;
1031 }
1032 
1033 static int vim2m_buf_prepare(struct vb2_buffer *vb)
1034 {
1035 	struct vim2m_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
1036 	struct vim2m_q_data *q_data;
1037 
1038 	dprintk(ctx->dev, 2, "type: %s\n", type_name(vb->vb2_queue->type));
1039 
1040 	q_data = get_q_data(ctx, vb->vb2_queue->type);
1041 	if (!q_data)
1042 		return -EINVAL;
1043 	if (vb2_plane_size(vb, 0) < q_data->sizeimage) {
1044 		dprintk(ctx->dev, 1,
1045 			"%s data will not fit into plane (%lu < %lu)\n",
1046 			__func__, vb2_plane_size(vb, 0),
1047 			(long)q_data->sizeimage);
1048 		return -EINVAL;
1049 	}
1050 
1051 	vb2_set_plane_payload(vb, 0, q_data->sizeimage);
1052 
1053 	return 0;
1054 }
1055 
1056 static void vim2m_buf_queue(struct vb2_buffer *vb)
1057 {
1058 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
1059 	struct vim2m_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
1060 
1061 	v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
1062 }
1063 
1064 static int vim2m_start_streaming(struct vb2_queue *q, unsigned int count)
1065 {
1066 	struct vim2m_ctx *ctx = vb2_get_drv_priv(q);
1067 	struct vim2m_q_data *q_data = get_q_data(ctx, q->type);
1068 
1069 	if (!q_data)
1070 		return -EINVAL;
1071 
1072 	if (V4L2_TYPE_IS_OUTPUT(q->type))
1073 		ctx->aborting = 0;
1074 
1075 	q_data->sequence = 0;
1076 	return 0;
1077 }
1078 
1079 static void vim2m_stop_streaming(struct vb2_queue *q)
1080 {
1081 	struct vim2m_ctx *ctx = vb2_get_drv_priv(q);
1082 	struct vb2_v4l2_buffer *vbuf;
1083 
1084 	cancel_delayed_work_sync(&ctx->work_run);
1085 
1086 	for (;;) {
1087 		if (V4L2_TYPE_IS_OUTPUT(q->type))
1088 			vbuf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
1089 		else
1090 			vbuf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
1091 		if (!vbuf)
1092 			return;
1093 		v4l2_ctrl_request_complete(vbuf->vb2_buf.req_obj.req,
1094 					   &ctx->hdl);
1095 		v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
1096 	}
1097 }
1098 
1099 static void vim2m_buf_request_complete(struct vb2_buffer *vb)
1100 {
1101 	struct vim2m_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
1102 
1103 	v4l2_ctrl_request_complete(vb->req_obj.req, &ctx->hdl);
1104 }
1105 
1106 static const struct vb2_ops vim2m_qops = {
1107 	.queue_setup	 = vim2m_queue_setup,
1108 	.buf_out_validate	 = vim2m_buf_out_validate,
1109 	.buf_prepare	 = vim2m_buf_prepare,
1110 	.buf_queue	 = vim2m_buf_queue,
1111 	.start_streaming = vim2m_start_streaming,
1112 	.stop_streaming  = vim2m_stop_streaming,
1113 	.wait_prepare	 = vb2_ops_wait_prepare,
1114 	.wait_finish	 = vb2_ops_wait_finish,
1115 	.buf_request_complete = vim2m_buf_request_complete,
1116 };
1117 
1118 static int queue_init(void *priv, struct vb2_queue *src_vq,
1119 		      struct vb2_queue *dst_vq)
1120 {
1121 	struct vim2m_ctx *ctx = priv;
1122 	int ret;
1123 
1124 	src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
1125 	src_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
1126 	src_vq->drv_priv = ctx;
1127 	src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
1128 	src_vq->ops = &vim2m_qops;
1129 	src_vq->mem_ops = &vb2_vmalloc_memops;
1130 	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
1131 	src_vq->lock = &ctx->vb_mutex;
1132 	src_vq->supports_requests = true;
1133 
1134 	ret = vb2_queue_init(src_vq);
1135 	if (ret)
1136 		return ret;
1137 
1138 	dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1139 	dst_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
1140 	dst_vq->drv_priv = ctx;
1141 	dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
1142 	dst_vq->ops = &vim2m_qops;
1143 	dst_vq->mem_ops = &vb2_vmalloc_memops;
1144 	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
1145 	dst_vq->lock = &ctx->vb_mutex;
1146 
1147 	return vb2_queue_init(dst_vq);
1148 }
1149 
1150 static struct v4l2_ctrl_config vim2m_ctrl_trans_time_msec = {
1151 	.ops = &vim2m_ctrl_ops,
1152 	.id = V4L2_CID_TRANS_TIME_MSEC,
1153 	.name = "Transaction Time (msec)",
1154 	.type = V4L2_CTRL_TYPE_INTEGER,
1155 	.min = 1,
1156 	.max = 10001,
1157 	.step = 1,
1158 };
1159 
1160 static const struct v4l2_ctrl_config vim2m_ctrl_trans_num_bufs = {
1161 	.ops = &vim2m_ctrl_ops,
1162 	.id = V4L2_CID_TRANS_NUM_BUFS,
1163 	.name = "Buffers Per Transaction",
1164 	.type = V4L2_CTRL_TYPE_INTEGER,
1165 	.def = 1,
1166 	.min = 1,
1167 	.max = MEM2MEM_DEF_NUM_BUFS,
1168 	.step = 1,
1169 };
1170 
1171 /*
1172  * File operations
1173  */
1174 static int vim2m_open(struct file *file)
1175 {
1176 	struct vim2m_dev *dev = video_drvdata(file);
1177 	struct vim2m_ctx *ctx = NULL;
1178 	struct v4l2_ctrl_handler *hdl;
1179 	int rc = 0;
1180 
1181 	if (mutex_lock_interruptible(&dev->dev_mutex))
1182 		return -ERESTARTSYS;
1183 	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
1184 	if (!ctx) {
1185 		rc = -ENOMEM;
1186 		goto open_unlock;
1187 	}
1188 
1189 	v4l2_fh_init(&ctx->fh, video_devdata(file));
1190 	file->private_data = &ctx->fh;
1191 	ctx->dev = dev;
1192 	hdl = &ctx->hdl;
1193 	v4l2_ctrl_handler_init(hdl, 4);
1194 	v4l2_ctrl_new_std(hdl, &vim2m_ctrl_ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
1195 	v4l2_ctrl_new_std(hdl, &vim2m_ctrl_ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
1196 
1197 	vim2m_ctrl_trans_time_msec.def = default_transtime;
1198 	v4l2_ctrl_new_custom(hdl, &vim2m_ctrl_trans_time_msec, NULL);
1199 	v4l2_ctrl_new_custom(hdl, &vim2m_ctrl_trans_num_bufs, NULL);
1200 	if (hdl->error) {
1201 		rc = hdl->error;
1202 		v4l2_ctrl_handler_free(hdl);
1203 		kfree(ctx);
1204 		goto open_unlock;
1205 	}
1206 	ctx->fh.ctrl_handler = hdl;
1207 	v4l2_ctrl_handler_setup(hdl);
1208 
1209 	ctx->q_data[V4L2_M2M_SRC].fmt = &formats[0];
1210 	ctx->q_data[V4L2_M2M_SRC].width = 640;
1211 	ctx->q_data[V4L2_M2M_SRC].height = 480;
1212 	ctx->q_data[V4L2_M2M_SRC].sizeimage =
1213 		ctx->q_data[V4L2_M2M_SRC].width *
1214 		ctx->q_data[V4L2_M2M_SRC].height *
1215 		(ctx->q_data[V4L2_M2M_SRC].fmt->depth >> 3);
1216 	ctx->q_data[V4L2_M2M_DST] = ctx->q_data[V4L2_M2M_SRC];
1217 	ctx->colorspace = V4L2_COLORSPACE_REC709;
1218 
1219 	ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init);
1220 
1221 	mutex_init(&ctx->vb_mutex);
1222 	INIT_DELAYED_WORK(&ctx->work_run, device_work);
1223 
1224 	if (IS_ERR(ctx->fh.m2m_ctx)) {
1225 		rc = PTR_ERR(ctx->fh.m2m_ctx);
1226 
1227 		v4l2_ctrl_handler_free(hdl);
1228 		v4l2_fh_exit(&ctx->fh);
1229 		kfree(ctx);
1230 		goto open_unlock;
1231 	}
1232 
1233 	v4l2_fh_add(&ctx->fh);
1234 	atomic_inc(&dev->num_inst);
1235 
1236 	dprintk(dev, 1, "Created instance: %p, m2m_ctx: %p\n",
1237 		ctx, ctx->fh.m2m_ctx);
1238 
1239 open_unlock:
1240 	mutex_unlock(&dev->dev_mutex);
1241 	return rc;
1242 }
1243 
1244 static int vim2m_release(struct file *file)
1245 {
1246 	struct vim2m_dev *dev = video_drvdata(file);
1247 	struct vim2m_ctx *ctx = file2ctx(file);
1248 
1249 	dprintk(dev, 1, "Releasing instance %p\n", ctx);
1250 
1251 	v4l2_fh_del(&ctx->fh);
1252 	v4l2_fh_exit(&ctx->fh);
1253 	v4l2_ctrl_handler_free(&ctx->hdl);
1254 	mutex_lock(&dev->dev_mutex);
1255 	v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
1256 	mutex_unlock(&dev->dev_mutex);
1257 	kfree(ctx);
1258 
1259 	atomic_dec(&dev->num_inst);
1260 
1261 	return 0;
1262 }
1263 
1264 static void vim2m_device_release(struct video_device *vdev)
1265 {
1266 	struct vim2m_dev *dev = container_of(vdev, struct vim2m_dev, vfd);
1267 
1268 	v4l2_device_unregister(&dev->v4l2_dev);
1269 	v4l2_m2m_release(dev->m2m_dev);
1270 #ifdef CONFIG_MEDIA_CONTROLLER
1271 	media_device_cleanup(&dev->mdev);
1272 #endif
1273 	kfree(dev);
1274 }
1275 
1276 static const struct v4l2_file_operations vim2m_fops = {
1277 	.owner		= THIS_MODULE,
1278 	.open		= vim2m_open,
1279 	.release	= vim2m_release,
1280 	.poll		= v4l2_m2m_fop_poll,
1281 	.unlocked_ioctl	= video_ioctl2,
1282 	.mmap		= v4l2_m2m_fop_mmap,
1283 };
1284 
1285 static const struct video_device vim2m_videodev = {
1286 	.name		= MEM2MEM_NAME,
1287 	.vfl_dir	= VFL_DIR_M2M,
1288 	.fops		= &vim2m_fops,
1289 	.ioctl_ops	= &vim2m_ioctl_ops,
1290 	.minor		= -1,
1291 	.release	= vim2m_device_release,
1292 	.device_caps	= V4L2_CAP_VIDEO_M2M | V4L2_CAP_STREAMING,
1293 };
1294 
1295 static const struct v4l2_m2m_ops m2m_ops = {
1296 	.device_run	= device_run,
1297 	.job_ready	= job_ready,
1298 	.job_abort	= job_abort,
1299 };
1300 
1301 static const struct media_device_ops m2m_media_ops = {
1302 	.req_validate = vb2_request_validate,
1303 	.req_queue = v4l2_m2m_request_queue,
1304 };
1305 
1306 static int vim2m_probe(struct platform_device *pdev)
1307 {
1308 	struct vim2m_dev *dev;
1309 	struct video_device *vfd;
1310 	int ret;
1311 
1312 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1313 	if (!dev)
1314 		return -ENOMEM;
1315 
1316 	ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
1317 	if (ret)
1318 		goto error_free;
1319 
1320 	atomic_set(&dev->num_inst, 0);
1321 	mutex_init(&dev->dev_mutex);
1322 
1323 	dev->vfd = vim2m_videodev;
1324 	vfd = &dev->vfd;
1325 	vfd->lock = &dev->dev_mutex;
1326 	vfd->v4l2_dev = &dev->v4l2_dev;
1327 
1328 	ret = video_register_device(vfd, VFL_TYPE_VIDEO, 0);
1329 	if (ret) {
1330 		v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
1331 		goto error_v4l2;
1332 	}
1333 
1334 	video_set_drvdata(vfd, dev);
1335 	v4l2_info(&dev->v4l2_dev,
1336 		  "Device registered as /dev/video%d\n", vfd->num);
1337 
1338 	platform_set_drvdata(pdev, dev);
1339 
1340 	dev->m2m_dev = v4l2_m2m_init(&m2m_ops);
1341 	if (IS_ERR(dev->m2m_dev)) {
1342 		v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem device\n");
1343 		ret = PTR_ERR(dev->m2m_dev);
1344 		dev->m2m_dev = NULL;
1345 		goto error_dev;
1346 	}
1347 
1348 #ifdef CONFIG_MEDIA_CONTROLLER
1349 	dev->mdev.dev = &pdev->dev;
1350 	strscpy(dev->mdev.model, "vim2m", sizeof(dev->mdev.model));
1351 	strscpy(dev->mdev.bus_info, "platform:vim2m",
1352 		sizeof(dev->mdev.bus_info));
1353 	media_device_init(&dev->mdev);
1354 	dev->mdev.ops = &m2m_media_ops;
1355 	dev->v4l2_dev.mdev = &dev->mdev;
1356 
1357 	ret = v4l2_m2m_register_media_controller(dev->m2m_dev, vfd,
1358 						 MEDIA_ENT_F_PROC_VIDEO_SCALER);
1359 	if (ret) {
1360 		v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem media controller\n");
1361 		goto error_dev;
1362 	}
1363 
1364 	ret = media_device_register(&dev->mdev);
1365 	if (ret) {
1366 		v4l2_err(&dev->v4l2_dev, "Failed to register mem2mem media device\n");
1367 		goto error_m2m_mc;
1368 	}
1369 #endif
1370 	return 0;
1371 
1372 #ifdef CONFIG_MEDIA_CONTROLLER
1373 error_m2m_mc:
1374 	v4l2_m2m_unregister_media_controller(dev->m2m_dev);
1375 #endif
1376 error_dev:
1377 	video_unregister_device(&dev->vfd);
1378 	/* vim2m_device_release called by video_unregister_device to release various objects */
1379 	return ret;
1380 error_v4l2:
1381 	v4l2_device_unregister(&dev->v4l2_dev);
1382 error_free:
1383 	kfree(dev);
1384 
1385 	return ret;
1386 }
1387 
1388 static int vim2m_remove(struct platform_device *pdev)
1389 {
1390 	struct vim2m_dev *dev = platform_get_drvdata(pdev);
1391 
1392 	v4l2_info(&dev->v4l2_dev, "Removing " MEM2MEM_NAME);
1393 
1394 #ifdef CONFIG_MEDIA_CONTROLLER
1395 	media_device_unregister(&dev->mdev);
1396 	v4l2_m2m_unregister_media_controller(dev->m2m_dev);
1397 #endif
1398 	video_unregister_device(&dev->vfd);
1399 
1400 	return 0;
1401 }
1402 
1403 static struct platform_driver vim2m_pdrv = {
1404 	.probe		= vim2m_probe,
1405 	.remove		= vim2m_remove,
1406 	.driver		= {
1407 		.name	= MEM2MEM_NAME,
1408 	},
1409 };
1410 
1411 static void __exit vim2m_exit(void)
1412 {
1413 	platform_driver_unregister(&vim2m_pdrv);
1414 	platform_device_unregister(&vim2m_pdev);
1415 }
1416 
1417 static int __init vim2m_init(void)
1418 {
1419 	int ret;
1420 
1421 	ret = platform_device_register(&vim2m_pdev);
1422 	if (ret)
1423 		return ret;
1424 
1425 	ret = platform_driver_register(&vim2m_pdrv);
1426 	if (ret)
1427 		platform_device_unregister(&vim2m_pdev);
1428 
1429 	return ret;
1430 }
1431 
1432 module_init(vim2m_init);
1433 module_exit(vim2m_exit);
1434