1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * TI Camera Access Layer (CAL) - Video Device
4  *
5  * Copyright (c) 2015-2020 Texas Instruments Inc.
6  *
7  * Authors:
8  *	Benoit Parrot <bparrot@ti.com>
9  *	Laurent Pinchart <laurent.pinchart@ideasonboard.com>
10  */
11 
12 #include <linux/ioctl.h>
13 #include <linux/pm_runtime.h>
14 #include <linux/videodev2.h>
15 
16 #include <media/media-device.h>
17 #include <media/v4l2-common.h>
18 #include <media/v4l2-ctrls.h>
19 #include <media/v4l2-device.h>
20 #include <media/v4l2-event.h>
21 #include <media/v4l2-fh.h>
22 #include <media/v4l2-ioctl.h>
23 #include <media/videobuf2-core.h>
24 #include <media/videobuf2-dma-contig.h>
25 
26 #include "cal.h"
27 
28 /*  Print Four-character-code (FOURCC) */
29 static char *fourcc_to_str(u32 fmt)
30 {
31 	static char code[5];
32 
33 	code[0] = (unsigned char)(fmt & 0xff);
34 	code[1] = (unsigned char)((fmt >> 8) & 0xff);
35 	code[2] = (unsigned char)((fmt >> 16) & 0xff);
36 	code[3] = (unsigned char)((fmt >> 24) & 0xff);
37 	code[4] = '\0';
38 
39 	return code;
40 }
41 
42 /* ------------------------------------------------------------------
43  *	V4L2 Common IOCTLs
44  * ------------------------------------------------------------------
45  */
46 
47 static int cal_querycap(struct file *file, void *priv,
48 			struct v4l2_capability *cap)
49 {
50 	strscpy(cap->driver, CAL_MODULE_NAME, sizeof(cap->driver));
51 	strscpy(cap->card, CAL_MODULE_NAME, sizeof(cap->card));
52 
53 	return 0;
54 }
55 
56 static int cal_g_fmt_vid_cap(struct file *file, void *priv,
57 			     struct v4l2_format *f)
58 {
59 	struct cal_ctx *ctx = video_drvdata(file);
60 
61 	*f = ctx->v_fmt;
62 
63 	return 0;
64 }
65 
66 /* ------------------------------------------------------------------
67  *	V4L2 Video Node Centric IOCTLs
68  * ------------------------------------------------------------------
69  */
70 
71 static const struct cal_format_info *find_format_by_pix(struct cal_ctx *ctx,
72 							u32 pixelformat)
73 {
74 	const struct cal_format_info *fmtinfo;
75 	unsigned int k;
76 
77 	for (k = 0; k < ctx->num_active_fmt; k++) {
78 		fmtinfo = ctx->active_fmt[k];
79 		if (fmtinfo->fourcc == pixelformat)
80 			return fmtinfo;
81 	}
82 
83 	return NULL;
84 }
85 
86 static const struct cal_format_info *find_format_by_code(struct cal_ctx *ctx,
87 							 u32 code)
88 {
89 	const struct cal_format_info *fmtinfo;
90 	unsigned int k;
91 
92 	for (k = 0; k < ctx->num_active_fmt; k++) {
93 		fmtinfo = ctx->active_fmt[k];
94 		if (fmtinfo->code == code)
95 			return fmtinfo;
96 	}
97 
98 	return NULL;
99 }
100 
101 static int cal_legacy_enum_fmt_vid_cap(struct file *file, void *priv,
102 				       struct v4l2_fmtdesc *f)
103 {
104 	struct cal_ctx *ctx = video_drvdata(file);
105 	const struct cal_format_info *fmtinfo;
106 
107 	if (f->index >= ctx->num_active_fmt)
108 		return -EINVAL;
109 
110 	fmtinfo = ctx->active_fmt[f->index];
111 
112 	f->pixelformat = fmtinfo->fourcc;
113 	f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
114 	return 0;
115 }
116 
117 static int __subdev_get_format(struct cal_ctx *ctx,
118 			       struct v4l2_mbus_framefmt *fmt)
119 {
120 	struct v4l2_subdev_format sd_fmt = {
121 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
122 		.pad = 0,
123 	};
124 	struct v4l2_mbus_framefmt *mbus_fmt = &sd_fmt.format;
125 	int ret;
126 
127 	ret = v4l2_subdev_call(ctx->phy->source, pad, get_fmt, NULL, &sd_fmt);
128 	if (ret)
129 		return ret;
130 
131 	*fmt = *mbus_fmt;
132 
133 	ctx_dbg(1, ctx, "%s %dx%d code:%04X\n", __func__,
134 		fmt->width, fmt->height, fmt->code);
135 
136 	return 0;
137 }
138 
139 static int __subdev_set_format(struct cal_ctx *ctx,
140 			       struct v4l2_mbus_framefmt *fmt)
141 {
142 	struct v4l2_subdev_format sd_fmt = {
143 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
144 		.pad = 0,
145 	};
146 	struct v4l2_mbus_framefmt *mbus_fmt = &sd_fmt.format;
147 	int ret;
148 
149 	*mbus_fmt = *fmt;
150 
151 	ret = v4l2_subdev_call(ctx->phy->source, pad, set_fmt, NULL, &sd_fmt);
152 	if (ret)
153 		return ret;
154 
155 	ctx_dbg(1, ctx, "%s %dx%d code:%04X\n", __func__,
156 		fmt->width, fmt->height, fmt->code);
157 
158 	return 0;
159 }
160 
161 static void cal_calc_format_size(struct cal_ctx *ctx,
162 				 const struct cal_format_info *fmtinfo,
163 				 struct v4l2_format *f)
164 {
165 	u32 bpl, max_width;
166 
167 	/*
168 	 * Maximum width is bound by the DMA max width in bytes.
169 	 * We need to recalculate the actual maxi width depending on the
170 	 * number of bytes per pixels required.
171 	 */
172 	max_width = CAL_MAX_WIDTH_BYTES / (ALIGN(fmtinfo->bpp, 8) >> 3);
173 	v4l_bound_align_image(&f->fmt.pix.width, 48, max_width, 2,
174 			      &f->fmt.pix.height, 32, CAL_MAX_HEIGHT_LINES,
175 			      0, 0);
176 
177 	bpl = (f->fmt.pix.width * ALIGN(fmtinfo->bpp, 8)) >> 3;
178 	f->fmt.pix.bytesperline = ALIGN(bpl, 16);
179 
180 	f->fmt.pix.sizeimage = f->fmt.pix.height *
181 			       f->fmt.pix.bytesperline;
182 
183 	ctx_dbg(3, ctx, "%s: fourcc: %s size: %dx%d bpl:%d img_size:%d\n",
184 		__func__, fourcc_to_str(f->fmt.pix.pixelformat),
185 		f->fmt.pix.width, f->fmt.pix.height,
186 		f->fmt.pix.bytesperline, f->fmt.pix.sizeimage);
187 }
188 
189 static int cal_legacy_try_fmt_vid_cap(struct file *file, void *priv,
190 				      struct v4l2_format *f)
191 {
192 	struct cal_ctx *ctx = video_drvdata(file);
193 	const struct cal_format_info *fmtinfo;
194 	struct v4l2_subdev_frame_size_enum fse = {
195 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
196 	};
197 	int found;
198 
199 	fmtinfo = find_format_by_pix(ctx, f->fmt.pix.pixelformat);
200 	if (!fmtinfo) {
201 		ctx_dbg(3, ctx, "Fourcc format (0x%08x) not found.\n",
202 			f->fmt.pix.pixelformat);
203 
204 		/* Just get the first one enumerated */
205 		fmtinfo = ctx->active_fmt[0];
206 		f->fmt.pix.pixelformat = fmtinfo->fourcc;
207 	}
208 
209 	f->fmt.pix.field = ctx->v_fmt.fmt.pix.field;
210 
211 	/* check for/find a valid width/height */
212 	found = false;
213 	fse.pad = 0;
214 	fse.code = fmtinfo->code;
215 	for (fse.index = 0; ; fse.index++) {
216 		int ret;
217 
218 		ret = v4l2_subdev_call(ctx->phy->source, pad, enum_frame_size,
219 				       NULL, &fse);
220 		if (ret)
221 			break;
222 
223 		if ((f->fmt.pix.width == fse.max_width) &&
224 		    (f->fmt.pix.height == fse.max_height)) {
225 			found = true;
226 			break;
227 		} else if ((f->fmt.pix.width >= fse.min_width) &&
228 			 (f->fmt.pix.width <= fse.max_width) &&
229 			 (f->fmt.pix.height >= fse.min_height) &&
230 			 (f->fmt.pix.height <= fse.max_height)) {
231 			found = true;
232 			break;
233 		}
234 	}
235 
236 	if (!found) {
237 		/* use existing values as default */
238 		f->fmt.pix.width = ctx->v_fmt.fmt.pix.width;
239 		f->fmt.pix.height =  ctx->v_fmt.fmt.pix.height;
240 	}
241 
242 	/*
243 	 * Use current colorspace for now, it will get
244 	 * updated properly during s_fmt
245 	 */
246 	f->fmt.pix.colorspace = ctx->v_fmt.fmt.pix.colorspace;
247 	cal_calc_format_size(ctx, fmtinfo, f);
248 	return 0;
249 }
250 
251 static int cal_legacy_s_fmt_vid_cap(struct file *file, void *priv,
252 				    struct v4l2_format *f)
253 {
254 	struct cal_ctx *ctx = video_drvdata(file);
255 	struct vb2_queue *q = &ctx->vb_vidq;
256 	struct v4l2_subdev_format sd_fmt = {
257 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
258 		.pad = CAL_CAMERARX_PAD_SINK,
259 	};
260 	const struct cal_format_info *fmtinfo;
261 	int ret;
262 
263 	if (vb2_is_busy(q)) {
264 		ctx_dbg(3, ctx, "%s device busy\n", __func__);
265 		return -EBUSY;
266 	}
267 
268 	ret = cal_legacy_try_fmt_vid_cap(file, priv, f);
269 	if (ret < 0)
270 		return ret;
271 
272 	fmtinfo = find_format_by_pix(ctx, f->fmt.pix.pixelformat);
273 
274 	v4l2_fill_mbus_format(&sd_fmt.format, &f->fmt.pix, fmtinfo->code);
275 
276 	ret = __subdev_set_format(ctx, &sd_fmt.format);
277 	if (ret)
278 		return ret;
279 
280 	/* Just double check nothing has gone wrong */
281 	if (sd_fmt.format.code != fmtinfo->code) {
282 		ctx_dbg(3, ctx,
283 			"%s subdev changed format on us, this should not happen\n",
284 			__func__);
285 		return -EINVAL;
286 	}
287 
288 	v4l2_fill_pix_format(&ctx->v_fmt.fmt.pix, &sd_fmt.format);
289 	ctx->v_fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
290 	ctx->v_fmt.fmt.pix.pixelformat = fmtinfo->fourcc;
291 	ctx->v_fmt.fmt.pix.field = sd_fmt.format.field;
292 	cal_calc_format_size(ctx, fmtinfo, &ctx->v_fmt);
293 
294 	v4l2_subdev_call(&ctx->phy->subdev, pad, set_fmt, NULL, &sd_fmt);
295 
296 	ctx->fmtinfo = fmtinfo;
297 	*f = ctx->v_fmt;
298 
299 	return 0;
300 }
301 
302 static int cal_legacy_enum_framesizes(struct file *file, void *fh,
303 				      struct v4l2_frmsizeenum *fsize)
304 {
305 	struct cal_ctx *ctx = video_drvdata(file);
306 	const struct cal_format_info *fmtinfo;
307 	struct v4l2_subdev_frame_size_enum fse = {
308 		.index = fsize->index,
309 		.pad = 0,
310 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
311 	};
312 	int ret;
313 
314 	/* check for valid format */
315 	fmtinfo = find_format_by_pix(ctx, fsize->pixel_format);
316 	if (!fmtinfo) {
317 		ctx_dbg(3, ctx, "Invalid pixel code: %x\n",
318 			fsize->pixel_format);
319 		return -EINVAL;
320 	}
321 
322 	fse.code = fmtinfo->code;
323 
324 	ret = v4l2_subdev_call(ctx->phy->source, pad, enum_frame_size, NULL,
325 			       &fse);
326 	if (ret)
327 		return ret;
328 
329 	ctx_dbg(1, ctx, "%s: index: %d code: %x W:[%d,%d] H:[%d,%d]\n",
330 		__func__, fse.index, fse.code, fse.min_width, fse.max_width,
331 		fse.min_height, fse.max_height);
332 
333 	fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
334 	fsize->discrete.width = fse.max_width;
335 	fsize->discrete.height = fse.max_height;
336 
337 	return 0;
338 }
339 
340 static int cal_legacy_enum_input(struct file *file, void *priv,
341 				 struct v4l2_input *inp)
342 {
343 	if (inp->index > 0)
344 		return -EINVAL;
345 
346 	inp->type = V4L2_INPUT_TYPE_CAMERA;
347 	sprintf(inp->name, "Camera %u", inp->index);
348 	return 0;
349 }
350 
351 static int cal_legacy_g_input(struct file *file, void *priv, unsigned int *i)
352 {
353 	*i = 0;
354 	return 0;
355 }
356 
357 static int cal_legacy_s_input(struct file *file, void *priv, unsigned int i)
358 {
359 	return i > 0 ? -EINVAL : 0;
360 }
361 
362 /* timeperframe is arbitrary and continuous */
363 static int cal_legacy_enum_frameintervals(struct file *file, void *priv,
364 					  struct v4l2_frmivalenum *fival)
365 {
366 	struct cal_ctx *ctx = video_drvdata(file);
367 	const struct cal_format_info *fmtinfo;
368 	struct v4l2_subdev_frame_interval_enum fie = {
369 		.index = fival->index,
370 		.width = fival->width,
371 		.height = fival->height,
372 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
373 	};
374 	int ret;
375 
376 	fmtinfo = find_format_by_pix(ctx, fival->pixel_format);
377 	if (!fmtinfo)
378 		return -EINVAL;
379 
380 	fie.code = fmtinfo->code;
381 	ret = v4l2_subdev_call(ctx->phy->source, pad, enum_frame_interval,
382 			       NULL, &fie);
383 	if (ret)
384 		return ret;
385 	fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
386 	fival->discrete = fie.interval;
387 
388 	return 0;
389 }
390 
391 static int cal_legacy_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
392 {
393 	struct cal_ctx *ctx = video_drvdata(file);
394 
395 	return v4l2_g_parm_cap(video_devdata(file), ctx->phy->source, a);
396 }
397 
398 static int cal_legacy_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
399 {
400 	struct cal_ctx *ctx = video_drvdata(file);
401 
402 	return v4l2_s_parm_cap(video_devdata(file), ctx->phy->source, a);
403 }
404 
405 static const struct v4l2_ioctl_ops cal_ioctl_legacy_ops = {
406 	.vidioc_querycap      = cal_querycap,
407 	.vidioc_enum_fmt_vid_cap  = cal_legacy_enum_fmt_vid_cap,
408 	.vidioc_g_fmt_vid_cap     = cal_g_fmt_vid_cap,
409 	.vidioc_try_fmt_vid_cap   = cal_legacy_try_fmt_vid_cap,
410 	.vidioc_s_fmt_vid_cap     = cal_legacy_s_fmt_vid_cap,
411 	.vidioc_enum_framesizes   = cal_legacy_enum_framesizes,
412 	.vidioc_reqbufs       = vb2_ioctl_reqbufs,
413 	.vidioc_create_bufs   = vb2_ioctl_create_bufs,
414 	.vidioc_prepare_buf   = vb2_ioctl_prepare_buf,
415 	.vidioc_querybuf      = vb2_ioctl_querybuf,
416 	.vidioc_qbuf          = vb2_ioctl_qbuf,
417 	.vidioc_dqbuf         = vb2_ioctl_dqbuf,
418 	.vidioc_expbuf        = vb2_ioctl_expbuf,
419 	.vidioc_enum_input    = cal_legacy_enum_input,
420 	.vidioc_g_input       = cal_legacy_g_input,
421 	.vidioc_s_input       = cal_legacy_s_input,
422 	.vidioc_enum_frameintervals = cal_legacy_enum_frameintervals,
423 	.vidioc_streamon      = vb2_ioctl_streamon,
424 	.vidioc_streamoff     = vb2_ioctl_streamoff,
425 	.vidioc_log_status    = v4l2_ctrl_log_status,
426 	.vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
427 	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
428 	.vidioc_g_parm		= cal_legacy_g_parm,
429 	.vidioc_s_parm		= cal_legacy_s_parm,
430 };
431 
432 /* ------------------------------------------------------------------
433  *	V4L2 Media Controller Centric IOCTLs
434  * ------------------------------------------------------------------
435  */
436 
437 static int cal_mc_enum_fmt_vid_cap(struct file *file, void  *priv,
438 				   struct v4l2_fmtdesc *f)
439 {
440 	unsigned int i;
441 	unsigned int idx;
442 
443 	if (f->index >= cal_num_formats)
444 		return -EINVAL;
445 
446 	idx = 0;
447 
448 	for (i = 0; i < cal_num_formats; ++i) {
449 		if (f->mbus_code && cal_formats[i].code != f->mbus_code)
450 			continue;
451 
452 		if (idx == f->index) {
453 			f->pixelformat = cal_formats[i].fourcc;
454 			f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
455 			return 0;
456 		}
457 
458 		idx++;
459 	}
460 
461 	return -EINVAL;
462 }
463 
464 static void cal_mc_try_fmt(struct cal_ctx *ctx, struct v4l2_format *f,
465 			   const struct cal_format_info **info)
466 {
467 	struct v4l2_pix_format *format = &f->fmt.pix;
468 	const struct cal_format_info *fmtinfo;
469 	unsigned int bpp;
470 
471 	/*
472 	 * Default to the first format if the requested pixel format code isn't
473 	 * supported.
474 	 */
475 	fmtinfo = cal_format_by_fourcc(f->fmt.pix.pixelformat);
476 	if (!fmtinfo)
477 		fmtinfo = &cal_formats[0];
478 
479 	/*
480 	 * Clamp the size, update the pixel format. The field and colorspace are
481 	 * accepted as-is, except for V4L2_FIELD_ANY that is turned into
482 	 * V4L2_FIELD_NONE.
483 	 */
484 	bpp = ALIGN(fmtinfo->bpp, 8);
485 
486 	format->width = clamp_t(unsigned int, format->width,
487 				CAL_MIN_WIDTH_BYTES * 8 / bpp,
488 				CAL_MAX_WIDTH_BYTES * 8 / bpp);
489 	format->height = clamp_t(unsigned int, format->height,
490 				 CAL_MIN_HEIGHT_LINES, CAL_MAX_HEIGHT_LINES);
491 	format->pixelformat = fmtinfo->fourcc;
492 
493 	if (format->field == V4L2_FIELD_ANY)
494 		format->field = V4L2_FIELD_NONE;
495 
496 	/*
497 	 * Calculate the number of bytes per line and the image size. The
498 	 * hardware stores the stride as a number of 16 bytes words, in a
499 	 * signed 15-bit value. Only 14 bits are thus usable.
500 	 */
501 	format->bytesperline = ALIGN(clamp(format->bytesperline,
502 					   format->width * bpp / 8,
503 					   ((1U << 14) - 1) * 16), 16);
504 
505 	format->sizeimage = format->height * format->bytesperline;
506 
507 	format->colorspace = ctx->v_fmt.fmt.pix.colorspace;
508 
509 	if (info)
510 		*info = fmtinfo;
511 
512 	ctx_dbg(3, ctx, "%s: %s %ux%u (bytesperline %u sizeimage %u)\n",
513 		__func__, fourcc_to_str(format->pixelformat),
514 		format->width, format->height,
515 		format->bytesperline, format->sizeimage);
516 }
517 
518 static int cal_mc_try_fmt_vid_cap(struct file *file, void *priv,
519 				  struct v4l2_format *f)
520 {
521 	struct cal_ctx *ctx = video_drvdata(file);
522 
523 	cal_mc_try_fmt(ctx, f, NULL);
524 	return 0;
525 }
526 
527 static int cal_mc_s_fmt_vid_cap(struct file *file, void *priv,
528 				struct v4l2_format *f)
529 {
530 	struct cal_ctx *ctx = video_drvdata(file);
531 	const struct cal_format_info *fmtinfo;
532 
533 	if (vb2_is_busy(&ctx->vb_vidq)) {
534 		ctx_dbg(3, ctx, "%s device busy\n", __func__);
535 		return -EBUSY;
536 	}
537 
538 	cal_mc_try_fmt(ctx, f, &fmtinfo);
539 
540 	ctx->v_fmt = *f;
541 	ctx->fmtinfo = fmtinfo;
542 
543 	return 0;
544 }
545 
546 static int cal_mc_enum_framesizes(struct file *file, void *fh,
547 				  struct v4l2_frmsizeenum *fsize)
548 {
549 	struct cal_ctx *ctx = video_drvdata(file);
550 	const struct cal_format_info *fmtinfo;
551 	unsigned int bpp;
552 
553 	if (fsize->index > 0)
554 		return -EINVAL;
555 
556 	fmtinfo = cal_format_by_fourcc(fsize->pixel_format);
557 	if (!fmtinfo) {
558 		ctx_dbg(3, ctx, "Invalid pixel format 0x%08x\n",
559 			fsize->pixel_format);
560 		return -EINVAL;
561 	}
562 
563 	bpp = ALIGN(fmtinfo->bpp, 8);
564 
565 	fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
566 	fsize->stepwise.min_width = CAL_MIN_WIDTH_BYTES * 8 / bpp;
567 	fsize->stepwise.max_width = CAL_MAX_WIDTH_BYTES * 8 / bpp;
568 	fsize->stepwise.step_width = 64 / bpp;
569 	fsize->stepwise.min_height = CAL_MIN_HEIGHT_LINES;
570 	fsize->stepwise.max_height = CAL_MAX_HEIGHT_LINES;
571 	fsize->stepwise.step_height = 1;
572 
573 	return 0;
574 }
575 
576 static const struct v4l2_ioctl_ops cal_ioctl_mc_ops = {
577 	.vidioc_querycap      = cal_querycap,
578 	.vidioc_enum_fmt_vid_cap  = cal_mc_enum_fmt_vid_cap,
579 	.vidioc_g_fmt_vid_cap     = cal_g_fmt_vid_cap,
580 	.vidioc_try_fmt_vid_cap   = cal_mc_try_fmt_vid_cap,
581 	.vidioc_s_fmt_vid_cap     = cal_mc_s_fmt_vid_cap,
582 	.vidioc_enum_framesizes   = cal_mc_enum_framesizes,
583 	.vidioc_reqbufs       = vb2_ioctl_reqbufs,
584 	.vidioc_create_bufs   = vb2_ioctl_create_bufs,
585 	.vidioc_prepare_buf   = vb2_ioctl_prepare_buf,
586 	.vidioc_querybuf      = vb2_ioctl_querybuf,
587 	.vidioc_qbuf          = vb2_ioctl_qbuf,
588 	.vidioc_dqbuf         = vb2_ioctl_dqbuf,
589 	.vidioc_expbuf        = vb2_ioctl_expbuf,
590 	.vidioc_streamon      = vb2_ioctl_streamon,
591 	.vidioc_streamoff     = vb2_ioctl_streamoff,
592 	.vidioc_log_status    = v4l2_ctrl_log_status,
593 };
594 
595 /* ------------------------------------------------------------------
596  *	videobuf2 Common Operations
597  * ------------------------------------------------------------------
598  */
599 
600 static int cal_queue_setup(struct vb2_queue *vq,
601 			   unsigned int *nbuffers, unsigned int *nplanes,
602 			   unsigned int sizes[], struct device *alloc_devs[])
603 {
604 	struct cal_ctx *ctx = vb2_get_drv_priv(vq);
605 	unsigned int size = ctx->v_fmt.fmt.pix.sizeimage;
606 
607 	if (vq->num_buffers + *nbuffers < 3)
608 		*nbuffers = 3 - vq->num_buffers;
609 
610 	if (*nplanes) {
611 		if (sizes[0] < size)
612 			return -EINVAL;
613 		size = sizes[0];
614 	}
615 
616 	*nplanes = 1;
617 	sizes[0] = size;
618 
619 	ctx_dbg(3, ctx, "nbuffers=%d, size=%d\n", *nbuffers, sizes[0]);
620 
621 	return 0;
622 }
623 
624 static int cal_buffer_prepare(struct vb2_buffer *vb)
625 {
626 	struct cal_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
627 	struct cal_buffer *buf = container_of(vb, struct cal_buffer,
628 					      vb.vb2_buf);
629 	unsigned long size;
630 
631 	size = ctx->v_fmt.fmt.pix.sizeimage;
632 	if (vb2_plane_size(vb, 0) < size) {
633 		ctx_err(ctx,
634 			"data will not fit into plane (%lu < %lu)\n",
635 			vb2_plane_size(vb, 0), size);
636 		return -EINVAL;
637 	}
638 
639 	vb2_set_plane_payload(&buf->vb.vb2_buf, 0, size);
640 	return 0;
641 }
642 
643 static void cal_buffer_queue(struct vb2_buffer *vb)
644 {
645 	struct cal_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
646 	struct cal_buffer *buf = container_of(vb, struct cal_buffer,
647 					      vb.vb2_buf);
648 	unsigned long flags;
649 
650 	/* recheck locking */
651 	spin_lock_irqsave(&ctx->dma.lock, flags);
652 	list_add_tail(&buf->list, &ctx->dma.queue);
653 	spin_unlock_irqrestore(&ctx->dma.lock, flags);
654 }
655 
656 static void cal_release_buffers(struct cal_ctx *ctx,
657 				enum vb2_buffer_state state)
658 {
659 	struct cal_buffer *buf, *tmp;
660 
661 	/* Release all queued buffers. */
662 	spin_lock_irq(&ctx->dma.lock);
663 
664 	list_for_each_entry_safe(buf, tmp, &ctx->dma.queue, list) {
665 		list_del(&buf->list);
666 		vb2_buffer_done(&buf->vb.vb2_buf, state);
667 	}
668 
669 	if (ctx->dma.pending) {
670 		vb2_buffer_done(&ctx->dma.pending->vb.vb2_buf, state);
671 		ctx->dma.pending = NULL;
672 	}
673 
674 	if (ctx->dma.active) {
675 		vb2_buffer_done(&ctx->dma.active->vb.vb2_buf, state);
676 		ctx->dma.active = NULL;
677 	}
678 
679 	spin_unlock_irq(&ctx->dma.lock);
680 }
681 
682 /* ------------------------------------------------------------------
683  *	videobuf2 Operations
684  * ------------------------------------------------------------------
685  */
686 
687 static int cal_video_check_format(struct cal_ctx *ctx)
688 {
689 	const struct v4l2_mbus_framefmt *format;
690 	struct media_pad *remote_pad;
691 
692 	remote_pad = media_pad_remote_pad_first(&ctx->pad);
693 	if (!remote_pad)
694 		return -ENODEV;
695 
696 	format = &ctx->phy->formats[remote_pad->index];
697 
698 	if (ctx->fmtinfo->code != format->code ||
699 	    ctx->v_fmt.fmt.pix.height != format->height ||
700 	    ctx->v_fmt.fmt.pix.width != format->width ||
701 	    ctx->v_fmt.fmt.pix.field != format->field)
702 		return -EPIPE;
703 
704 	return 0;
705 }
706 
707 static int cal_start_streaming(struct vb2_queue *vq, unsigned int count)
708 {
709 	struct cal_ctx *ctx = vb2_get_drv_priv(vq);
710 	struct cal_buffer *buf;
711 	dma_addr_t addr;
712 	int ret;
713 
714 	ret = video_device_pipeline_alloc_start(&ctx->vdev);
715 	if (ret < 0) {
716 		ctx_err(ctx, "Failed to start media pipeline: %d\n", ret);
717 		goto error_release_buffers;
718 	}
719 
720 	/*
721 	 * Verify that the currently configured format matches the output of
722 	 * the connected CAMERARX.
723 	 */
724 	ret = cal_video_check_format(ctx);
725 	if (ret < 0) {
726 		ctx_dbg(3, ctx,
727 			"Format mismatch between CAMERARX and video node\n");
728 		goto error_pipeline;
729 	}
730 
731 	ret = cal_ctx_prepare(ctx);
732 	if (ret) {
733 		ctx_err(ctx, "Failed to prepare context: %d\n", ret);
734 		goto error_pipeline;
735 	}
736 
737 	spin_lock_irq(&ctx->dma.lock);
738 	buf = list_first_entry(&ctx->dma.queue, struct cal_buffer, list);
739 	ctx->dma.active = buf;
740 	list_del(&buf->list);
741 	spin_unlock_irq(&ctx->dma.lock);
742 
743 	addr = vb2_dma_contig_plane_dma_addr(&buf->vb.vb2_buf, 0);
744 
745 	ret = pm_runtime_resume_and_get(ctx->cal->dev);
746 	if (ret < 0)
747 		goto error_pipeline;
748 
749 	cal_ctx_set_dma_addr(ctx, addr);
750 	cal_ctx_start(ctx);
751 
752 	ret = v4l2_subdev_call(&ctx->phy->subdev, video, s_stream, 1);
753 	if (ret)
754 		goto error_stop;
755 
756 	if (cal_debug >= 4)
757 		cal_quickdump_regs(ctx->cal);
758 
759 	return 0;
760 
761 error_stop:
762 	cal_ctx_stop(ctx);
763 	pm_runtime_put_sync(ctx->cal->dev);
764 	cal_ctx_unprepare(ctx);
765 
766 error_pipeline:
767 	video_device_pipeline_stop(&ctx->vdev);
768 error_release_buffers:
769 	cal_release_buffers(ctx, VB2_BUF_STATE_QUEUED);
770 
771 	return ret;
772 }
773 
774 static void cal_stop_streaming(struct vb2_queue *vq)
775 {
776 	struct cal_ctx *ctx = vb2_get_drv_priv(vq);
777 
778 	cal_ctx_stop(ctx);
779 
780 	v4l2_subdev_call(&ctx->phy->subdev, video, s_stream, 0);
781 
782 	pm_runtime_put_sync(ctx->cal->dev);
783 
784 	cal_ctx_unprepare(ctx);
785 
786 	cal_release_buffers(ctx, VB2_BUF_STATE_ERROR);
787 
788 	video_device_pipeline_stop(&ctx->vdev);
789 }
790 
791 static const struct vb2_ops cal_video_qops = {
792 	.queue_setup		= cal_queue_setup,
793 	.buf_prepare		= cal_buffer_prepare,
794 	.buf_queue		= cal_buffer_queue,
795 	.start_streaming	= cal_start_streaming,
796 	.stop_streaming		= cal_stop_streaming,
797 	.wait_prepare		= vb2_ops_wait_prepare,
798 	.wait_finish		= vb2_ops_wait_finish,
799 };
800 
801 /* ------------------------------------------------------------------
802  *	V4L2 Initialization and Registration
803  * ------------------------------------------------------------------
804  */
805 
806 static const struct v4l2_file_operations cal_fops = {
807 	.owner		= THIS_MODULE,
808 	.open           = v4l2_fh_open,
809 	.release        = vb2_fop_release,
810 	.poll		= vb2_fop_poll,
811 	.unlocked_ioctl = video_ioctl2, /* V4L2 ioctl handler */
812 	.mmap           = vb2_fop_mmap,
813 };
814 
815 static int cal_ctx_v4l2_init_formats(struct cal_ctx *ctx)
816 {
817 	struct v4l2_mbus_framefmt mbus_fmt;
818 	const struct cal_format_info *fmtinfo;
819 	unsigned int i, j, k;
820 	int ret = 0;
821 
822 	/* Enumerate sub device formats and enable all matching local formats */
823 	ctx->active_fmt = devm_kcalloc(ctx->cal->dev, cal_num_formats,
824 				       sizeof(*ctx->active_fmt), GFP_KERNEL);
825 	if (!ctx->active_fmt)
826 		return -ENOMEM;
827 
828 	ctx->num_active_fmt = 0;
829 
830 	for (j = 0, i = 0; ; ++j) {
831 		struct v4l2_subdev_mbus_code_enum mbus_code = {
832 			.index = j,
833 			.which = V4L2_SUBDEV_FORMAT_ACTIVE,
834 		};
835 
836 		ret = v4l2_subdev_call(ctx->phy->source, pad, enum_mbus_code,
837 				       NULL, &mbus_code);
838 		if (ret == -EINVAL)
839 			break;
840 
841 		if (ret) {
842 			ctx_err(ctx, "Error enumerating mbus codes in subdev %s: %d\n",
843 				ctx->phy->source->name, ret);
844 			return ret;
845 		}
846 
847 		ctx_dbg(2, ctx,
848 			"subdev %s: code: %04x idx: %u\n",
849 			ctx->phy->source->name, mbus_code.code, j);
850 
851 		for (k = 0; k < cal_num_formats; k++) {
852 			fmtinfo = &cal_formats[k];
853 
854 			if (mbus_code.code == fmtinfo->code) {
855 				ctx->active_fmt[i] = fmtinfo;
856 				ctx_dbg(2, ctx,
857 					"matched fourcc: %s: code: %04x idx: %u\n",
858 					fourcc_to_str(fmtinfo->fourcc),
859 					fmtinfo->code, i);
860 				ctx->num_active_fmt = ++i;
861 			}
862 		}
863 	}
864 
865 	if (i == 0) {
866 		ctx_err(ctx, "No suitable format reported by subdev %s\n",
867 			ctx->phy->source->name);
868 		return -EINVAL;
869 	}
870 
871 	ret = __subdev_get_format(ctx, &mbus_fmt);
872 	if (ret)
873 		return ret;
874 
875 	fmtinfo = find_format_by_code(ctx, mbus_fmt.code);
876 	if (!fmtinfo) {
877 		ctx_dbg(3, ctx, "mbus code format (0x%08x) not found.\n",
878 			mbus_fmt.code);
879 		return -EINVAL;
880 	}
881 
882 	/* Save current format */
883 	v4l2_fill_pix_format(&ctx->v_fmt.fmt.pix, &mbus_fmt);
884 	ctx->v_fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
885 	ctx->v_fmt.fmt.pix.pixelformat = fmtinfo->fourcc;
886 	cal_calc_format_size(ctx, fmtinfo, &ctx->v_fmt);
887 	ctx->fmtinfo = fmtinfo;
888 
889 	return 0;
890 }
891 
892 static int cal_ctx_v4l2_init_mc_format(struct cal_ctx *ctx)
893 {
894 	const struct cal_format_info *fmtinfo;
895 	struct v4l2_pix_format *pix_fmt = &ctx->v_fmt.fmt.pix;
896 
897 	fmtinfo = cal_format_by_code(MEDIA_BUS_FMT_UYVY8_2X8);
898 	if (!fmtinfo)
899 		return -EINVAL;
900 
901 	pix_fmt->width = 640;
902 	pix_fmt->height = 480;
903 	pix_fmt->field = V4L2_FIELD_NONE;
904 	pix_fmt->colorspace = V4L2_COLORSPACE_SRGB;
905 	pix_fmt->ycbcr_enc = V4L2_YCBCR_ENC_601;
906 	pix_fmt->quantization = V4L2_QUANTIZATION_LIM_RANGE;
907 	pix_fmt->xfer_func = V4L2_XFER_FUNC_SRGB;
908 	pix_fmt->pixelformat = fmtinfo->fourcc;
909 
910 	ctx->v_fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
911 
912 	/* Save current format */
913 	cal_calc_format_size(ctx, fmtinfo, &ctx->v_fmt);
914 	ctx->fmtinfo = fmtinfo;
915 
916 	return 0;
917 }
918 
919 int cal_ctx_v4l2_register(struct cal_ctx *ctx)
920 {
921 	struct video_device *vfd = &ctx->vdev;
922 	int ret;
923 
924 	if (!cal_mc_api) {
925 		struct v4l2_ctrl_handler *hdl = &ctx->ctrl_handler;
926 
927 		ret = cal_ctx_v4l2_init_formats(ctx);
928 		if (ret) {
929 			ctx_err(ctx, "Failed to init formats: %d\n", ret);
930 			return ret;
931 		}
932 
933 		ret = v4l2_ctrl_add_handler(hdl, ctx->phy->source->ctrl_handler,
934 					    NULL, true);
935 		if (ret < 0) {
936 			ctx_err(ctx, "Failed to add source ctrl handler\n");
937 			return ret;
938 		}
939 	} else {
940 		ret = cal_ctx_v4l2_init_mc_format(ctx);
941 		if (ret) {
942 			ctx_err(ctx, "Failed to init format: %d\n", ret);
943 			return ret;
944 		}
945 	}
946 
947 	ret = video_register_device(vfd, VFL_TYPE_VIDEO, cal_video_nr);
948 	if (ret < 0) {
949 		ctx_err(ctx, "Failed to register video device\n");
950 		return ret;
951 	}
952 
953 	ret = media_create_pad_link(&ctx->phy->subdev.entity,
954 				    CAL_CAMERARX_PAD_FIRST_SOURCE,
955 				    &vfd->entity, 0,
956 				    MEDIA_LNK_FL_IMMUTABLE |
957 				    MEDIA_LNK_FL_ENABLED);
958 	if (ret) {
959 		ctx_err(ctx, "Failed to create media link for context %u\n",
960 			ctx->dma_ctx);
961 		video_unregister_device(vfd);
962 		return ret;
963 	}
964 
965 	ctx_info(ctx, "V4L2 device registered as %s\n",
966 		 video_device_node_name(vfd));
967 
968 	return 0;
969 }
970 
971 void cal_ctx_v4l2_unregister(struct cal_ctx *ctx)
972 {
973 	ctx_dbg(1, ctx, "unregistering %s\n",
974 		video_device_node_name(&ctx->vdev));
975 
976 	video_unregister_device(&ctx->vdev);
977 }
978 
979 int cal_ctx_v4l2_init(struct cal_ctx *ctx)
980 {
981 	struct video_device *vfd = &ctx->vdev;
982 	struct vb2_queue *q = &ctx->vb_vidq;
983 	int ret;
984 
985 	INIT_LIST_HEAD(&ctx->dma.queue);
986 	spin_lock_init(&ctx->dma.lock);
987 	mutex_init(&ctx->mutex);
988 	init_waitqueue_head(&ctx->dma.wait);
989 
990 	/* Initialize the vb2 queue. */
991 	q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
992 	q->io_modes = VB2_MMAP | VB2_DMABUF;
993 	q->drv_priv = ctx;
994 	q->buf_struct_size = sizeof(struct cal_buffer);
995 	q->ops = &cal_video_qops;
996 	q->mem_ops = &vb2_dma_contig_memops;
997 	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
998 	q->lock = &ctx->mutex;
999 	q->min_buffers_needed = 3;
1000 	q->dev = ctx->cal->dev;
1001 
1002 	ret = vb2_queue_init(q);
1003 	if (ret)
1004 		return ret;
1005 
1006 	/* Initialize the video device and media entity. */
1007 	vfd->fops = &cal_fops;
1008 	vfd->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING
1009 			 | (cal_mc_api ? V4L2_CAP_IO_MC : 0);
1010 	vfd->v4l2_dev = &ctx->cal->v4l2_dev;
1011 	vfd->queue = q;
1012 	snprintf(vfd->name, sizeof(vfd->name), "CAL output %u", ctx->dma_ctx);
1013 	vfd->release = video_device_release_empty;
1014 	vfd->ioctl_ops = cal_mc_api ? &cal_ioctl_mc_ops : &cal_ioctl_legacy_ops;
1015 	vfd->lock = &ctx->mutex;
1016 	video_set_drvdata(vfd, ctx);
1017 
1018 	ctx->pad.flags = MEDIA_PAD_FL_SINK;
1019 	ret = media_entity_pads_init(&vfd->entity, 1, &ctx->pad);
1020 	if (ret < 0)
1021 		return ret;
1022 
1023 	if (!cal_mc_api) {
1024 		/* Initialize the control handler. */
1025 		struct v4l2_ctrl_handler *hdl = &ctx->ctrl_handler;
1026 
1027 		ret = v4l2_ctrl_handler_init(hdl, 11);
1028 		if (ret < 0) {
1029 			ctx_err(ctx, "Failed to init ctrl handler\n");
1030 			goto error;
1031 		}
1032 
1033 		vfd->ctrl_handler = hdl;
1034 	}
1035 
1036 	return 0;
1037 
1038 error:
1039 	media_entity_cleanup(&vfd->entity);
1040 	return ret;
1041 }
1042 
1043 void cal_ctx_v4l2_cleanup(struct cal_ctx *ctx)
1044 {
1045 	if (!cal_mc_api)
1046 		v4l2_ctrl_handler_free(&ctx->ctrl_handler);
1047 
1048 	media_entity_cleanup(&ctx->vdev.entity);
1049 }
1050