1 /*
2 * vimc-common.c Virtual Media Controller Driver
3 *
4 * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 */
17
18 #include <linux/init.h>
19 #include <linux/module.h>
20
21 #include "vimc-common.h"
22
23 /*
24 * NOTE: non-bayer formats need to come first (necessary for enum_mbus_code
25 * in the scaler)
26 */
27 static const struct vimc_pix_map vimc_pix_map_list[] = {
28 /* TODO: add all missing formats */
29
30 /* RGB formats */
31 {
32 .code = MEDIA_BUS_FMT_BGR888_1X24,
33 .pixelformat = V4L2_PIX_FMT_BGR24,
34 .bpp = 3,
35 .bayer = false,
36 },
37 {
38 .code = MEDIA_BUS_FMT_RGB888_1X24,
39 .pixelformat = V4L2_PIX_FMT_RGB24,
40 .bpp = 3,
41 .bayer = false,
42 },
43 {
44 .code = MEDIA_BUS_FMT_ARGB8888_1X32,
45 .pixelformat = V4L2_PIX_FMT_ARGB32,
46 .bpp = 4,
47 .bayer = false,
48 },
49
50 /* Bayer formats */
51 {
52 .code = MEDIA_BUS_FMT_SBGGR8_1X8,
53 .pixelformat = V4L2_PIX_FMT_SBGGR8,
54 .bpp = 1,
55 .bayer = true,
56 },
57 {
58 .code = MEDIA_BUS_FMT_SGBRG8_1X8,
59 .pixelformat = V4L2_PIX_FMT_SGBRG8,
60 .bpp = 1,
61 .bayer = true,
62 },
63 {
64 .code = MEDIA_BUS_FMT_SGRBG8_1X8,
65 .pixelformat = V4L2_PIX_FMT_SGRBG8,
66 .bpp = 1,
67 .bayer = true,
68 },
69 {
70 .code = MEDIA_BUS_FMT_SRGGB8_1X8,
71 .pixelformat = V4L2_PIX_FMT_SRGGB8,
72 .bpp = 1,
73 .bayer = true,
74 },
75 {
76 .code = MEDIA_BUS_FMT_SBGGR10_1X10,
77 .pixelformat = V4L2_PIX_FMT_SBGGR10,
78 .bpp = 2,
79 .bayer = true,
80 },
81 {
82 .code = MEDIA_BUS_FMT_SGBRG10_1X10,
83 .pixelformat = V4L2_PIX_FMT_SGBRG10,
84 .bpp = 2,
85 .bayer = true,
86 },
87 {
88 .code = MEDIA_BUS_FMT_SGRBG10_1X10,
89 .pixelformat = V4L2_PIX_FMT_SGRBG10,
90 .bpp = 2,
91 .bayer = true,
92 },
93 {
94 .code = MEDIA_BUS_FMT_SRGGB10_1X10,
95 .pixelformat = V4L2_PIX_FMT_SRGGB10,
96 .bpp = 2,
97 .bayer = true,
98 },
99
100 /* 10bit raw bayer a-law compressed to 8 bits */
101 {
102 .code = MEDIA_BUS_FMT_SBGGR10_ALAW8_1X8,
103 .pixelformat = V4L2_PIX_FMT_SBGGR10ALAW8,
104 .bpp = 1,
105 .bayer = true,
106 },
107 {
108 .code = MEDIA_BUS_FMT_SGBRG10_ALAW8_1X8,
109 .pixelformat = V4L2_PIX_FMT_SGBRG10ALAW8,
110 .bpp = 1,
111 .bayer = true,
112 },
113 {
114 .code = MEDIA_BUS_FMT_SGRBG10_ALAW8_1X8,
115 .pixelformat = V4L2_PIX_FMT_SGRBG10ALAW8,
116 .bpp = 1,
117 .bayer = true,
118 },
119 {
120 .code = MEDIA_BUS_FMT_SRGGB10_ALAW8_1X8,
121 .pixelformat = V4L2_PIX_FMT_SRGGB10ALAW8,
122 .bpp = 1,
123 .bayer = true,
124 },
125
126 /* 10bit raw bayer DPCM compressed to 8 bits */
127 {
128 .code = MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8,
129 .pixelformat = V4L2_PIX_FMT_SBGGR10DPCM8,
130 .bpp = 1,
131 .bayer = true,
132 },
133 {
134 .code = MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8,
135 .pixelformat = V4L2_PIX_FMT_SGBRG10DPCM8,
136 .bpp = 1,
137 .bayer = true,
138 },
139 {
140 .code = MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
141 .pixelformat = V4L2_PIX_FMT_SGRBG10DPCM8,
142 .bpp = 1,
143 .bayer = true,
144 },
145 {
146 .code = MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8,
147 .pixelformat = V4L2_PIX_FMT_SRGGB10DPCM8,
148 .bpp = 1,
149 .bayer = true,
150 },
151 {
152 .code = MEDIA_BUS_FMT_SBGGR12_1X12,
153 .pixelformat = V4L2_PIX_FMT_SBGGR12,
154 .bpp = 2,
155 .bayer = true,
156 },
157 {
158 .code = MEDIA_BUS_FMT_SGBRG12_1X12,
159 .pixelformat = V4L2_PIX_FMT_SGBRG12,
160 .bpp = 2,
161 .bayer = true,
162 },
163 {
164 .code = MEDIA_BUS_FMT_SGRBG12_1X12,
165 .pixelformat = V4L2_PIX_FMT_SGRBG12,
166 .bpp = 2,
167 .bayer = true,
168 },
169 {
170 .code = MEDIA_BUS_FMT_SRGGB12_1X12,
171 .pixelformat = V4L2_PIX_FMT_SRGGB12,
172 .bpp = 2,
173 .bayer = true,
174 },
175 };
176
vimc_pix_map_by_index(unsigned int i)177 const struct vimc_pix_map *vimc_pix_map_by_index(unsigned int i)
178 {
179 if (i >= ARRAY_SIZE(vimc_pix_map_list))
180 return NULL;
181
182 return &vimc_pix_map_list[i];
183 }
184 EXPORT_SYMBOL_GPL(vimc_pix_map_by_index);
185
vimc_pix_map_by_code(u32 code)186 const struct vimc_pix_map *vimc_pix_map_by_code(u32 code)
187 {
188 unsigned int i;
189
190 for (i = 0; i < ARRAY_SIZE(vimc_pix_map_list); i++) {
191 if (vimc_pix_map_list[i].code == code)
192 return &vimc_pix_map_list[i];
193 }
194 return NULL;
195 }
196 EXPORT_SYMBOL_GPL(vimc_pix_map_by_code);
197
vimc_pix_map_by_pixelformat(u32 pixelformat)198 const struct vimc_pix_map *vimc_pix_map_by_pixelformat(u32 pixelformat)
199 {
200 unsigned int i;
201
202 for (i = 0; i < ARRAY_SIZE(vimc_pix_map_list); i++) {
203 if (vimc_pix_map_list[i].pixelformat == pixelformat)
204 return &vimc_pix_map_list[i];
205 }
206 return NULL;
207 }
208 EXPORT_SYMBOL_GPL(vimc_pix_map_by_pixelformat);
209
210 /* Helper function to allocate and initialize pads */
vimc_pads_init(u16 num_pads,const unsigned long * pads_flag)211 struct media_pad *vimc_pads_init(u16 num_pads, const unsigned long *pads_flag)
212 {
213 struct media_pad *pads;
214 unsigned int i;
215
216 /* Allocate memory for the pads */
217 pads = kcalloc(num_pads, sizeof(*pads), GFP_KERNEL);
218 if (!pads)
219 return ERR_PTR(-ENOMEM);
220
221 /* Initialize the pads */
222 for (i = 0; i < num_pads; i++) {
223 pads[i].index = i;
224 pads[i].flags = pads_flag[i];
225 }
226
227 return pads;
228 }
229 EXPORT_SYMBOL_GPL(vimc_pads_init);
230
vimc_pipeline_s_stream(struct media_entity * ent,int enable)231 int vimc_pipeline_s_stream(struct media_entity *ent, int enable)
232 {
233 struct v4l2_subdev *sd;
234 struct media_pad *pad;
235 unsigned int i;
236 int ret;
237
238 for (i = 0; i < ent->num_pads; i++) {
239 if (ent->pads[i].flags & MEDIA_PAD_FL_SOURCE)
240 continue;
241
242 /* Start the stream in the subdevice direct connected */
243 pad = media_entity_remote_pad(&ent->pads[i]);
244 if (!pad)
245 continue;
246
247 if (!is_media_entity_v4l2_subdev(pad->entity))
248 return -EINVAL;
249
250 sd = media_entity_to_v4l2_subdev(pad->entity);
251 ret = v4l2_subdev_call(sd, video, s_stream, enable);
252 if (ret && ret != -ENOIOCTLCMD)
253 return ret;
254 }
255
256 return 0;
257 }
258 EXPORT_SYMBOL_GPL(vimc_pipeline_s_stream);
259
vimc_get_mbus_format(struct media_pad * pad,struct v4l2_subdev_format * fmt)260 static int vimc_get_mbus_format(struct media_pad *pad,
261 struct v4l2_subdev_format *fmt)
262 {
263 if (is_media_entity_v4l2_subdev(pad->entity)) {
264 struct v4l2_subdev *sd =
265 media_entity_to_v4l2_subdev(pad->entity);
266 int ret;
267
268 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
269 fmt->pad = pad->index;
270
271 ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
272 if (ret)
273 return ret;
274
275 } else if (is_media_entity_v4l2_video_device(pad->entity)) {
276 struct video_device *vdev = container_of(pad->entity,
277 struct video_device,
278 entity);
279 struct vimc_ent_device *ved = video_get_drvdata(vdev);
280 const struct vimc_pix_map *vpix;
281 struct v4l2_pix_format vdev_fmt;
282
283 if (!ved->vdev_get_format)
284 return -ENOIOCTLCMD;
285
286 ved->vdev_get_format(ved, &vdev_fmt);
287 vpix = vimc_pix_map_by_pixelformat(vdev_fmt.pixelformat);
288 v4l2_fill_mbus_format(&fmt->format, &vdev_fmt, vpix->code);
289 } else {
290 return -EINVAL;
291 }
292
293 return 0;
294 }
295
vimc_link_validate(struct media_link * link)296 int vimc_link_validate(struct media_link *link)
297 {
298 struct v4l2_subdev_format source_fmt, sink_fmt;
299 int ret;
300
301 ret = vimc_get_mbus_format(link->source, &source_fmt);
302 if (ret)
303 return ret;
304
305 ret = vimc_get_mbus_format(link->sink, &sink_fmt);
306 if (ret)
307 return ret;
308
309 pr_info("vimc link validate: "
310 "%s:src:%dx%d (0x%x, %d, %d, %d, %d) "
311 "%s:snk:%dx%d (0x%x, %d, %d, %d, %d)\n",
312 /* src */
313 link->source->entity->name,
314 source_fmt.format.width, source_fmt.format.height,
315 source_fmt.format.code, source_fmt.format.colorspace,
316 source_fmt.format.quantization, source_fmt.format.xfer_func,
317 source_fmt.format.ycbcr_enc,
318 /* sink */
319 link->sink->entity->name,
320 sink_fmt.format.width, sink_fmt.format.height,
321 sink_fmt.format.code, sink_fmt.format.colorspace,
322 sink_fmt.format.quantization, sink_fmt.format.xfer_func,
323 sink_fmt.format.ycbcr_enc);
324
325 /* The width, height and code must match. */
326 if (source_fmt.format.width != sink_fmt.format.width
327 || source_fmt.format.height != sink_fmt.format.height
328 || source_fmt.format.code != sink_fmt.format.code)
329 return -EPIPE;
330
331 /*
332 * The field order must match, or the sink field order must be NONE
333 * to support interlaced hardware connected to bridges that support
334 * progressive formats only.
335 */
336 if (source_fmt.format.field != sink_fmt.format.field &&
337 sink_fmt.format.field != V4L2_FIELD_NONE)
338 return -EPIPE;
339
340 /*
341 * If colorspace is DEFAULT, then assume all the colorimetry is also
342 * DEFAULT, return 0 to skip comparing the other colorimetry parameters
343 */
344 if (source_fmt.format.colorspace == V4L2_COLORSPACE_DEFAULT
345 || sink_fmt.format.colorspace == V4L2_COLORSPACE_DEFAULT)
346 return 0;
347
348 /* Colorspace must match. */
349 if (source_fmt.format.colorspace != sink_fmt.format.colorspace)
350 return -EPIPE;
351
352 /* Colorimetry must match if they are not set to DEFAULT */
353 if (source_fmt.format.ycbcr_enc != V4L2_YCBCR_ENC_DEFAULT
354 && sink_fmt.format.ycbcr_enc != V4L2_YCBCR_ENC_DEFAULT
355 && source_fmt.format.ycbcr_enc != sink_fmt.format.ycbcr_enc)
356 return -EPIPE;
357
358 if (source_fmt.format.quantization != V4L2_QUANTIZATION_DEFAULT
359 && sink_fmt.format.quantization != V4L2_QUANTIZATION_DEFAULT
360 && source_fmt.format.quantization != sink_fmt.format.quantization)
361 return -EPIPE;
362
363 if (source_fmt.format.xfer_func != V4L2_XFER_FUNC_DEFAULT
364 && sink_fmt.format.xfer_func != V4L2_XFER_FUNC_DEFAULT
365 && source_fmt.format.xfer_func != sink_fmt.format.xfer_func)
366 return -EPIPE;
367
368 return 0;
369 }
370 EXPORT_SYMBOL_GPL(vimc_link_validate);
371
372 static const struct media_entity_operations vimc_ent_sd_mops = {
373 .link_validate = vimc_link_validate,
374 };
375
vimc_ent_sd_register(struct vimc_ent_device * ved,struct v4l2_subdev * sd,struct v4l2_device * v4l2_dev,const char * const name,u32 function,u16 num_pads,const unsigned long * pads_flag,const struct v4l2_subdev_ops * sd_ops)376 int vimc_ent_sd_register(struct vimc_ent_device *ved,
377 struct v4l2_subdev *sd,
378 struct v4l2_device *v4l2_dev,
379 const char *const name,
380 u32 function,
381 u16 num_pads,
382 const unsigned long *pads_flag,
383 const struct v4l2_subdev_ops *sd_ops)
384 {
385 int ret;
386
387 /* Allocate the pads */
388 ved->pads = vimc_pads_init(num_pads, pads_flag);
389 if (IS_ERR(ved->pads))
390 return PTR_ERR(ved->pads);
391
392 /* Fill the vimc_ent_device struct */
393 ved->ent = &sd->entity;
394
395 /* Initialize the subdev */
396 v4l2_subdev_init(sd, sd_ops);
397 sd->entity.function = function;
398 sd->entity.ops = &vimc_ent_sd_mops;
399 sd->owner = THIS_MODULE;
400 strlcpy(sd->name, name, sizeof(sd->name));
401 v4l2_set_subdevdata(sd, ved);
402
403 /* Expose this subdev to user space */
404 sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
405 if (sd->ctrl_handler)
406 sd->flags |= V4L2_SUBDEV_FL_HAS_EVENTS;
407
408 /* Initialize the media entity */
409 ret = media_entity_pads_init(&sd->entity, num_pads, ved->pads);
410 if (ret)
411 goto err_clean_pads;
412
413 /* Register the subdev with the v4l2 and the media framework */
414 ret = v4l2_device_register_subdev(v4l2_dev, sd);
415 if (ret) {
416 dev_err(v4l2_dev->dev,
417 "%s: subdev register failed (err=%d)\n",
418 name, ret);
419 goto err_clean_m_ent;
420 }
421
422 return 0;
423
424 err_clean_m_ent:
425 media_entity_cleanup(&sd->entity);
426 err_clean_pads:
427 vimc_pads_cleanup(ved->pads);
428 return ret;
429 }
430 EXPORT_SYMBOL_GPL(vimc_ent_sd_register);
431
vimc_ent_sd_unregister(struct vimc_ent_device * ved,struct v4l2_subdev * sd)432 void vimc_ent_sd_unregister(struct vimc_ent_device *ved, struct v4l2_subdev *sd)
433 {
434 v4l2_device_unregister_subdev(sd);
435 media_entity_cleanup(ved->ent);
436 vimc_pads_cleanup(ved->pads);
437 }
438 EXPORT_SYMBOL_GPL(vimc_ent_sd_unregister);
439
440 MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC) Common");
441 MODULE_AUTHOR("Helen Koike <helen.fornazier@gmail.com>");
442 MODULE_LICENSE("GPL");
443