1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * vimc-sensor.c Virtual Media Controller Driver
4  *
5  * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
6  */
7 
8 #include <linux/v4l2-mediabus.h>
9 #include <linux/vmalloc.h>
10 #include <media/v4l2-ctrls.h>
11 #include <media/v4l2-event.h>
12 #include <media/v4l2-subdev.h>
13 #include <media/tpg/v4l2-tpg.h>
14 
15 #include "vimc-common.h"
16 
17 struct vimc_sen_device {
18 	struct vimc_ent_device ved;
19 	struct v4l2_subdev sd;
20 	struct tpg_data tpg;
21 	u8 *frame;
22 	/* The active format */
23 	struct v4l2_mbus_framefmt mbus_format;
24 	struct v4l2_ctrl_handler hdl;
25 	struct media_pad pad;
26 };
27 
28 static const struct v4l2_mbus_framefmt fmt_default = {
29 	.width = 640,
30 	.height = 480,
31 	.code = MEDIA_BUS_FMT_RGB888_1X24,
32 	.field = V4L2_FIELD_NONE,
33 	.colorspace = V4L2_COLORSPACE_SRGB,
34 };
35 
36 static int vimc_sen_init_cfg(struct v4l2_subdev *sd,
37 			     struct v4l2_subdev_pad_config *cfg)
38 {
39 	unsigned int i;
40 
41 	for (i = 0; i < sd->entity.num_pads; i++) {
42 		struct v4l2_mbus_framefmt *mf;
43 
44 		mf = v4l2_subdev_get_try_format(sd, cfg, i);
45 		*mf = fmt_default;
46 	}
47 
48 	return 0;
49 }
50 
51 static int vimc_sen_enum_mbus_code(struct v4l2_subdev *sd,
52 				   struct v4l2_subdev_pad_config *cfg,
53 				   struct v4l2_subdev_mbus_code_enum *code)
54 {
55 	u32 mbus_code = vimc_mbus_code_by_index(code->index);
56 
57 	if (!mbus_code)
58 		return -EINVAL;
59 
60 	code->code = mbus_code;
61 
62 	return 0;
63 }
64 
65 static int vimc_sen_enum_frame_size(struct v4l2_subdev *sd,
66 				    struct v4l2_subdev_pad_config *cfg,
67 				    struct v4l2_subdev_frame_size_enum *fse)
68 {
69 	const struct vimc_pix_map *vpix;
70 
71 	if (fse->index)
72 		return -EINVAL;
73 
74 	/* Only accept code in the pix map table */
75 	vpix = vimc_pix_map_by_code(fse->code);
76 	if (!vpix)
77 		return -EINVAL;
78 
79 	fse->min_width = VIMC_FRAME_MIN_WIDTH;
80 	fse->max_width = VIMC_FRAME_MAX_WIDTH;
81 	fse->min_height = VIMC_FRAME_MIN_HEIGHT;
82 	fse->max_height = VIMC_FRAME_MAX_HEIGHT;
83 
84 	return 0;
85 }
86 
87 static int vimc_sen_get_fmt(struct v4l2_subdev *sd,
88 			    struct v4l2_subdev_pad_config *cfg,
89 			    struct v4l2_subdev_format *fmt)
90 {
91 	struct vimc_sen_device *vsen =
92 				container_of(sd, struct vimc_sen_device, sd);
93 
94 	fmt->format = fmt->which == V4L2_SUBDEV_FORMAT_TRY ?
95 		      *v4l2_subdev_get_try_format(sd, cfg, fmt->pad) :
96 		      vsen->mbus_format;
97 
98 	return 0;
99 }
100 
101 static void vimc_sen_tpg_s_format(struct vimc_sen_device *vsen)
102 {
103 	const struct vimc_pix_map *vpix =
104 				vimc_pix_map_by_code(vsen->mbus_format.code);
105 
106 	tpg_reset_source(&vsen->tpg, vsen->mbus_format.width,
107 			 vsen->mbus_format.height, vsen->mbus_format.field);
108 	tpg_s_bytesperline(&vsen->tpg, 0, vsen->mbus_format.width * vpix->bpp);
109 	tpg_s_buf_height(&vsen->tpg, vsen->mbus_format.height);
110 	tpg_s_fourcc(&vsen->tpg, vpix->pixelformat);
111 	/* TODO: add support for V4L2_FIELD_ALTERNATE */
112 	tpg_s_field(&vsen->tpg, vsen->mbus_format.field, false);
113 	tpg_s_colorspace(&vsen->tpg, vsen->mbus_format.colorspace);
114 	tpg_s_ycbcr_enc(&vsen->tpg, vsen->mbus_format.ycbcr_enc);
115 	tpg_s_quantization(&vsen->tpg, vsen->mbus_format.quantization);
116 	tpg_s_xfer_func(&vsen->tpg, vsen->mbus_format.xfer_func);
117 }
118 
119 static void vimc_sen_adjust_fmt(struct v4l2_mbus_framefmt *fmt)
120 {
121 	const struct vimc_pix_map *vpix;
122 
123 	/* Only accept code in the pix map table */
124 	vpix = vimc_pix_map_by_code(fmt->code);
125 	if (!vpix)
126 		fmt->code = fmt_default.code;
127 
128 	fmt->width = clamp_t(u32, fmt->width, VIMC_FRAME_MIN_WIDTH,
129 			     VIMC_FRAME_MAX_WIDTH) & ~1;
130 	fmt->height = clamp_t(u32, fmt->height, VIMC_FRAME_MIN_HEIGHT,
131 			      VIMC_FRAME_MAX_HEIGHT) & ~1;
132 
133 	/* TODO: add support for V4L2_FIELD_ALTERNATE */
134 	if (fmt->field == V4L2_FIELD_ANY || fmt->field == V4L2_FIELD_ALTERNATE)
135 		fmt->field = fmt_default.field;
136 
137 	vimc_colorimetry_clamp(fmt);
138 }
139 
140 static int vimc_sen_set_fmt(struct v4l2_subdev *sd,
141 			    struct v4l2_subdev_pad_config *cfg,
142 			    struct v4l2_subdev_format *fmt)
143 {
144 	struct vimc_sen_device *vsen = v4l2_get_subdevdata(sd);
145 	struct v4l2_mbus_framefmt *mf;
146 
147 	if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
148 		/* Do not change the format while stream is on */
149 		if (vsen->frame)
150 			return -EBUSY;
151 
152 		mf = &vsen->mbus_format;
153 	} else {
154 		mf = v4l2_subdev_get_try_format(sd, cfg, fmt->pad);
155 	}
156 
157 	/* Set the new format */
158 	vimc_sen_adjust_fmt(&fmt->format);
159 
160 	dev_dbg(vsen->ved.dev, "%s: format update: "
161 		"old:%dx%d (0x%x, %d, %d, %d, %d) "
162 		"new:%dx%d (0x%x, %d, %d, %d, %d)\n", vsen->sd.name,
163 		/* old */
164 		mf->width, mf->height, mf->code,
165 		mf->colorspace,	mf->quantization,
166 		mf->xfer_func, mf->ycbcr_enc,
167 		/* new */
168 		fmt->format.width, fmt->format.height, fmt->format.code,
169 		fmt->format.colorspace, fmt->format.quantization,
170 		fmt->format.xfer_func, fmt->format.ycbcr_enc);
171 
172 	*mf = fmt->format;
173 
174 	return 0;
175 }
176 
177 static const struct v4l2_subdev_pad_ops vimc_sen_pad_ops = {
178 	.init_cfg		= vimc_sen_init_cfg,
179 	.enum_mbus_code		= vimc_sen_enum_mbus_code,
180 	.enum_frame_size	= vimc_sen_enum_frame_size,
181 	.get_fmt		= vimc_sen_get_fmt,
182 	.set_fmt		= vimc_sen_set_fmt,
183 };
184 
185 static void *vimc_sen_process_frame(struct vimc_ent_device *ved,
186 				    const void *sink_frame)
187 {
188 	struct vimc_sen_device *vsen = container_of(ved, struct vimc_sen_device,
189 						    ved);
190 
191 	tpg_fill_plane_buffer(&vsen->tpg, 0, 0, vsen->frame);
192 	return vsen->frame;
193 }
194 
195 static int vimc_sen_s_stream(struct v4l2_subdev *sd, int enable)
196 {
197 	struct vimc_sen_device *vsen =
198 				container_of(sd, struct vimc_sen_device, sd);
199 
200 	if (enable) {
201 		const struct vimc_pix_map *vpix;
202 		unsigned int frame_size;
203 
204 		/* Calculate the frame size */
205 		vpix = vimc_pix_map_by_code(vsen->mbus_format.code);
206 		frame_size = vsen->mbus_format.width * vpix->bpp *
207 			     vsen->mbus_format.height;
208 
209 		/*
210 		 * Allocate the frame buffer. Use vmalloc to be able to
211 		 * allocate a large amount of memory
212 		 */
213 		vsen->frame = vmalloc(frame_size);
214 		if (!vsen->frame)
215 			return -ENOMEM;
216 
217 		/* configure the test pattern generator */
218 		vimc_sen_tpg_s_format(vsen);
219 
220 	} else {
221 
222 		vfree(vsen->frame);
223 		vsen->frame = NULL;
224 	}
225 
226 	return 0;
227 }
228 
229 static const struct v4l2_subdev_core_ops vimc_sen_core_ops = {
230 	.log_status = v4l2_ctrl_subdev_log_status,
231 	.subscribe_event = v4l2_ctrl_subdev_subscribe_event,
232 	.unsubscribe_event = v4l2_event_subdev_unsubscribe,
233 };
234 
235 static const struct v4l2_subdev_video_ops vimc_sen_video_ops = {
236 	.s_stream = vimc_sen_s_stream,
237 };
238 
239 static const struct v4l2_subdev_ops vimc_sen_ops = {
240 	.core = &vimc_sen_core_ops,
241 	.pad = &vimc_sen_pad_ops,
242 	.video = &vimc_sen_video_ops,
243 };
244 
245 static int vimc_sen_s_ctrl(struct v4l2_ctrl *ctrl)
246 {
247 	struct vimc_sen_device *vsen =
248 		container_of(ctrl->handler, struct vimc_sen_device, hdl);
249 
250 	switch (ctrl->id) {
251 	case VIMC_CID_TEST_PATTERN:
252 		tpg_s_pattern(&vsen->tpg, ctrl->val);
253 		break;
254 	case V4L2_CID_HFLIP:
255 		tpg_s_hflip(&vsen->tpg, ctrl->val);
256 		break;
257 	case V4L2_CID_VFLIP:
258 		tpg_s_vflip(&vsen->tpg, ctrl->val);
259 		break;
260 	case V4L2_CID_BRIGHTNESS:
261 		tpg_s_brightness(&vsen->tpg, ctrl->val);
262 		break;
263 	case V4L2_CID_CONTRAST:
264 		tpg_s_contrast(&vsen->tpg, ctrl->val);
265 		break;
266 	case V4L2_CID_HUE:
267 		tpg_s_hue(&vsen->tpg, ctrl->val);
268 		break;
269 	case V4L2_CID_SATURATION:
270 		tpg_s_saturation(&vsen->tpg, ctrl->val);
271 		break;
272 	default:
273 		return -EINVAL;
274 	}
275 	return 0;
276 }
277 
278 static const struct v4l2_ctrl_ops vimc_sen_ctrl_ops = {
279 	.s_ctrl = vimc_sen_s_ctrl,
280 };
281 
282 static void vimc_sen_release(struct vimc_ent_device *ved)
283 {
284 	struct vimc_sen_device *vsen =
285 		container_of(ved, struct vimc_sen_device, ved);
286 
287 	v4l2_ctrl_handler_free(&vsen->hdl);
288 	tpg_free(&vsen->tpg);
289 	media_entity_cleanup(vsen->ved.ent);
290 	kfree(vsen);
291 }
292 
293 /* Image Processing Controls */
294 static const struct v4l2_ctrl_config vimc_sen_ctrl_class = {
295 	.flags = V4L2_CTRL_FLAG_READ_ONLY | V4L2_CTRL_FLAG_WRITE_ONLY,
296 	.id = VIMC_CID_VIMC_CLASS,
297 	.name = "VIMC Controls",
298 	.type = V4L2_CTRL_TYPE_CTRL_CLASS,
299 };
300 
301 static const struct v4l2_ctrl_config vimc_sen_ctrl_test_pattern = {
302 	.ops = &vimc_sen_ctrl_ops,
303 	.id = VIMC_CID_TEST_PATTERN,
304 	.name = "Test Pattern",
305 	.type = V4L2_CTRL_TYPE_MENU,
306 	.max = TPG_PAT_NOISE,
307 	.qmenu = tpg_pattern_strings,
308 };
309 
310 static struct vimc_ent_device *vimc_sen_add(struct vimc_device *vimc,
311 					    const char *vcfg_name)
312 {
313 	struct v4l2_device *v4l2_dev = &vimc->v4l2_dev;
314 	struct vimc_sen_device *vsen;
315 	int ret;
316 
317 	/* Allocate the vsen struct */
318 	vsen = kzalloc(sizeof(*vsen), GFP_KERNEL);
319 	if (!vsen)
320 		return ERR_PTR(-ENOMEM);
321 
322 	v4l2_ctrl_handler_init(&vsen->hdl, 4);
323 
324 	v4l2_ctrl_new_custom(&vsen->hdl, &vimc_sen_ctrl_class, NULL);
325 	v4l2_ctrl_new_custom(&vsen->hdl, &vimc_sen_ctrl_test_pattern, NULL);
326 	v4l2_ctrl_new_std(&vsen->hdl, &vimc_sen_ctrl_ops,
327 			  V4L2_CID_VFLIP, 0, 1, 1, 0);
328 	v4l2_ctrl_new_std(&vsen->hdl, &vimc_sen_ctrl_ops,
329 			  V4L2_CID_HFLIP, 0, 1, 1, 0);
330 	v4l2_ctrl_new_std(&vsen->hdl, &vimc_sen_ctrl_ops,
331 			  V4L2_CID_BRIGHTNESS, 0, 255, 1, 128);
332 	v4l2_ctrl_new_std(&vsen->hdl, &vimc_sen_ctrl_ops,
333 			  V4L2_CID_CONTRAST, 0, 255, 1, 128);
334 	v4l2_ctrl_new_std(&vsen->hdl, &vimc_sen_ctrl_ops,
335 			  V4L2_CID_HUE, -128, 127, 1, 0);
336 	v4l2_ctrl_new_std(&vsen->hdl, &vimc_sen_ctrl_ops,
337 			  V4L2_CID_SATURATION, 0, 255, 1, 128);
338 	vsen->sd.ctrl_handler = &vsen->hdl;
339 	if (vsen->hdl.error) {
340 		ret = vsen->hdl.error;
341 		goto err_free_vsen;
342 	}
343 
344 	/* Initialize the test pattern generator */
345 	tpg_init(&vsen->tpg, vsen->mbus_format.width,
346 		 vsen->mbus_format.height);
347 	ret = tpg_alloc(&vsen->tpg, VIMC_FRAME_MAX_WIDTH);
348 	if (ret)
349 		goto err_free_hdl;
350 
351 	/* Initialize ved and sd */
352 	vsen->pad.flags = MEDIA_PAD_FL_SOURCE;
353 	ret = vimc_ent_sd_register(&vsen->ved, &vsen->sd, v4l2_dev,
354 				   vcfg_name,
355 				   MEDIA_ENT_F_CAM_SENSOR, 1, &vsen->pad,
356 				   &vimc_sen_ops);
357 	if (ret)
358 		goto err_free_tpg;
359 
360 	vsen->ved.process_frame = vimc_sen_process_frame;
361 	vsen->ved.dev = vimc->mdev.dev;
362 
363 	/* Initialize the frame format */
364 	vsen->mbus_format = fmt_default;
365 
366 	return &vsen->ved;
367 
368 err_free_tpg:
369 	tpg_free(&vsen->tpg);
370 err_free_hdl:
371 	v4l2_ctrl_handler_free(&vsen->hdl);
372 err_free_vsen:
373 	kfree(vsen);
374 
375 	return ERR_PTR(ret);
376 }
377 
378 struct vimc_ent_type vimc_sen_type = {
379 	.add = vimc_sen_add,
380 	.release = vimc_sen_release
381 };
382