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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * vimc-common.c Virtual Media Controller Driver
4 *
5 * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
6 */
7
8#include <linux/init.h>
9#include <linux/module.h>
10
11#include "vimc-common.h"
12
13/*
14 * NOTE: non-bayer formats need to come first (necessary for enum_mbus_code
15 * in the scaler)
16 */
17static const struct vimc_pix_map vimc_pix_map_list[] = {
18 /* TODO: add all missing formats */
19
20 /* RGB formats */
21 {
22 .code = MEDIA_BUS_FMT_BGR888_1X24,
23 .pixelformat = V4L2_PIX_FMT_BGR24,
24 .bpp = 3,
25 .bayer = false,
26 },
27 {
28 .code = MEDIA_BUS_FMT_RGB888_1X24,
29 .pixelformat = V4L2_PIX_FMT_RGB24,
30 .bpp = 3,
31 .bayer = false,
32 },
33 {
34 .code = MEDIA_BUS_FMT_ARGB8888_1X32,
35 .pixelformat = V4L2_PIX_FMT_ARGB32,
36 .bpp = 4,
37 .bayer = false,
38 },
39
40 /* Bayer formats */
41 {
42 .code = MEDIA_BUS_FMT_SBGGR8_1X8,
43 .pixelformat = V4L2_PIX_FMT_SBGGR8,
44 .bpp = 1,
45 .bayer = true,
46 },
47 {
48 .code = MEDIA_BUS_FMT_SGBRG8_1X8,
49 .pixelformat = V4L2_PIX_FMT_SGBRG8,
50 .bpp = 1,
51 .bayer = true,
52 },
53 {
54 .code = MEDIA_BUS_FMT_SGRBG8_1X8,
55 .pixelformat = V4L2_PIX_FMT_SGRBG8,
56 .bpp = 1,
57 .bayer = true,
58 },
59 {
60 .code = MEDIA_BUS_FMT_SRGGB8_1X8,
61 .pixelformat = V4L2_PIX_FMT_SRGGB8,
62 .bpp = 1,
63 .bayer = true,
64 },
65 {
66 .code = MEDIA_BUS_FMT_SBGGR10_1X10,
67 .pixelformat = V4L2_PIX_FMT_SBGGR10,
68 .bpp = 2,
69 .bayer = true,
70 },
71 {
72 .code = MEDIA_BUS_FMT_SGBRG10_1X10,
73 .pixelformat = V4L2_PIX_FMT_SGBRG10,
74 .bpp = 2,
75 .bayer = true,
76 },
77 {
78 .code = MEDIA_BUS_FMT_SGRBG10_1X10,
79 .pixelformat = V4L2_PIX_FMT_SGRBG10,
80 .bpp = 2,
81 .bayer = true,
82 },
83 {
84 .code = MEDIA_BUS_FMT_SRGGB10_1X10,
85 .pixelformat = V4L2_PIX_FMT_SRGGB10,
86 .bpp = 2,
87 .bayer = true,
88 },
89
90 /* 10bit raw bayer a-law compressed to 8 bits */
91 {
92 .code = MEDIA_BUS_FMT_SBGGR10_ALAW8_1X8,
93 .pixelformat = V4L2_PIX_FMT_SBGGR10ALAW8,
94 .bpp = 1,
95 .bayer = true,
96 },
97 {
98 .code = MEDIA_BUS_FMT_SGBRG10_ALAW8_1X8,
99 .pixelformat = V4L2_PIX_FMT_SGBRG10ALAW8,
100 .bpp = 1,
101 .bayer = true,
102 },
103 {
104 .code = MEDIA_BUS_FMT_SGRBG10_ALAW8_1X8,
105 .pixelformat = V4L2_PIX_FMT_SGRBG10ALAW8,
106 .bpp = 1,
107 .bayer = true,
108 },
109 {
110 .code = MEDIA_BUS_FMT_SRGGB10_ALAW8_1X8,
111 .pixelformat = V4L2_PIX_FMT_SRGGB10ALAW8,
112 .bpp = 1,
113 .bayer = true,
114 },
115
116 /* 10bit raw bayer DPCM compressed to 8 bits */
117 {
118 .code = MEDIA_BUS_FMT_SBGGR10_DPCM8_1X8,
119 .pixelformat = V4L2_PIX_FMT_SBGGR10DPCM8,
120 .bpp = 1,
121 .bayer = true,
122 },
123 {
124 .code = MEDIA_BUS_FMT_SGBRG10_DPCM8_1X8,
125 .pixelformat = V4L2_PIX_FMT_SGBRG10DPCM8,
126 .bpp = 1,
127 .bayer = true,
128 },
129 {
130 .code = MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
131 .pixelformat = V4L2_PIX_FMT_SGRBG10DPCM8,
132 .bpp = 1,
133 .bayer = true,
134 },
135 {
136 .code = MEDIA_BUS_FMT_SRGGB10_DPCM8_1X8,
137 .pixelformat = V4L2_PIX_FMT_SRGGB10DPCM8,
138 .bpp = 1,
139 .bayer = true,
140 },
141 {
142 .code = MEDIA_BUS_FMT_SBGGR12_1X12,
143 .pixelformat = V4L2_PIX_FMT_SBGGR12,
144 .bpp = 2,
145 .bayer = true,
146 },
147 {
148 .code = MEDIA_BUS_FMT_SGBRG12_1X12,
149 .pixelformat = V4L2_PIX_FMT_SGBRG12,
150 .bpp = 2,
151 .bayer = true,
152 },
153 {
154 .code = MEDIA_BUS_FMT_SGRBG12_1X12,
155 .pixelformat = V4L2_PIX_FMT_SGRBG12,
156 .bpp = 2,
157 .bayer = true,
158 },
159 {
160 .code = MEDIA_BUS_FMT_SRGGB12_1X12,
161 .pixelformat = V4L2_PIX_FMT_SRGGB12,
162 .bpp = 2,
163 .bayer = true,
164 },
165};
166
167const struct vimc_pix_map *vimc_pix_map_by_index(unsigned int i)
168{
169 if (i >= ARRAY_SIZE(vimc_pix_map_list))
170 return NULL;
171
172 return &vimc_pix_map_list[i];
173}
174EXPORT_SYMBOL_GPL(vimc_pix_map_by_index);
175
176const struct vimc_pix_map *vimc_pix_map_by_code(u32 code)
177{
178 unsigned int i;
179
180 for (i = 0; i < ARRAY_SIZE(vimc_pix_map_list); i++) {
181 if (vimc_pix_map_list[i].code == code)
182 return &vimc_pix_map_list[i];
183 }
184 return NULL;
185}
186EXPORT_SYMBOL_GPL(vimc_pix_map_by_code);
187
188const struct vimc_pix_map *vimc_pix_map_by_pixelformat(u32 pixelformat)
189{
190 unsigned int i;
191
192 for (i = 0; i < ARRAY_SIZE(vimc_pix_map_list); i++) {
193 if (vimc_pix_map_list[i].pixelformat == pixelformat)
194 return &vimc_pix_map_list[i];
195 }
196 return NULL;
197}
198EXPORT_SYMBOL_GPL(vimc_pix_map_by_pixelformat);
199
200/* Helper function to allocate and initialize pads */
201struct media_pad *vimc_pads_init(u16 num_pads, const unsigned long *pads_flag)
202{
203 struct media_pad *pads;
204 unsigned int i;
205
206 /* Allocate memory for the pads */
207 pads = kcalloc(num_pads, sizeof(*pads), GFP_KERNEL);
208 if (!pads)
209 return ERR_PTR(-ENOMEM);
210
211 /* Initialize the pads */
212 for (i = 0; i < num_pads; i++) {
213 pads[i].index = i;
214 pads[i].flags = pads_flag[i];
215 }
216
217 return pads;
218}
219EXPORT_SYMBOL_GPL(vimc_pads_init);
220
221int vimc_pipeline_s_stream(struct media_entity *ent, int enable)
222{
223 struct v4l2_subdev *sd;
224 struct media_pad *pad;
225 unsigned int i;
226 int ret;
227
228 for (i = 0; i < ent->num_pads; i++) {
229 if (ent->pads[i].flags & MEDIA_PAD_FL_SOURCE)
230 continue;
231
232 /* Start the stream in the subdevice direct connected */
233 pad = media_entity_remote_pad(&ent->pads[i]);
234 if (!pad)
235 continue;
236
237 if (!is_media_entity_v4l2_subdev(pad->entity))
238 return -EINVAL;
239
240 sd = media_entity_to_v4l2_subdev(pad->entity);
241 ret = v4l2_subdev_call(sd, video, s_stream, enable);
242 if (ret && ret != -ENOIOCTLCMD)
243 return ret;
244 }
245
246 return 0;
247}
248EXPORT_SYMBOL_GPL(vimc_pipeline_s_stream);
249
250static int vimc_get_mbus_format(struct media_pad *pad,
251 struct v4l2_subdev_format *fmt)
252{
253 if (is_media_entity_v4l2_subdev(pad->entity)) {
254 struct v4l2_subdev *sd =
255 media_entity_to_v4l2_subdev(pad->entity);
256 int ret;
257
258 fmt->which = V4L2_SUBDEV_FORMAT_ACTIVE;
259 fmt->pad = pad->index;
260
261 ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, fmt);
262 if (ret)
263 return ret;
264
265 } else if (is_media_entity_v4l2_video_device(pad->entity)) {
266 struct video_device *vdev = container_of(pad->entity,
267 struct video_device,
268 entity);
269 struct vimc_ent_device *ved = video_get_drvdata(vdev);
270 const struct vimc_pix_map *vpix;
271 struct v4l2_pix_format vdev_fmt;
272
273 if (!ved->vdev_get_format)
274 return -ENOIOCTLCMD;
275
276 ved->vdev_get_format(ved, &vdev_fmt);
277 vpix = vimc_pix_map_by_pixelformat(vdev_fmt.pixelformat);
278 v4l2_fill_mbus_format(&fmt->format, &vdev_fmt, vpix->code);
279 } else {
280 return -EINVAL;
281 }
282
283 return 0;
284}
285
286int vimc_link_validate(struct media_link *link)
287{
288 struct v4l2_subdev_format source_fmt, sink_fmt;
289 int ret;
290
291 ret = vimc_get_mbus_format(link->source, &source_fmt);
292 if (ret)
293 return ret;
294
295 ret = vimc_get_mbus_format(link->sink, &sink_fmt);
296 if (ret)
297 return ret;
298
299 pr_info("vimc link validate: "
300 "%s:src:%dx%d (0x%x, %d, %d, %d, %d) "
301 "%s:snk:%dx%d (0x%x, %d, %d, %d, %d)\n",
302 /* src */
303 link->source->entity->name,
304 source_fmt.format.width, source_fmt.format.height,
305 source_fmt.format.code, source_fmt.format.colorspace,
306 source_fmt.format.quantization, source_fmt.format.xfer_func,
307 source_fmt.format.ycbcr_enc,
308 /* sink */
309 link->sink->entity->name,
310 sink_fmt.format.width, sink_fmt.format.height,
311 sink_fmt.format.code, sink_fmt.format.colorspace,
312 sink_fmt.format.quantization, sink_fmt.format.xfer_func,
313 sink_fmt.format.ycbcr_enc);
314
315 /* The width, height and code must match. */
316 if (source_fmt.format.width != sink_fmt.format.width
317 || source_fmt.format.height != sink_fmt.format.height
318 || source_fmt.format.code != sink_fmt.format.code)
319 return -EPIPE;
320
321 /*
322 * The field order must match, or the sink field order must be NONE
323 * to support interlaced hardware connected to bridges that support
324 * progressive formats only.
325 */
326 if (source_fmt.format.field != sink_fmt.format.field &&
327 sink_fmt.format.field != V4L2_FIELD_NONE)
328 return -EPIPE;
329
330 /*
331 * If colorspace is DEFAULT, then assume all the colorimetry is also
332 * DEFAULT, return 0 to skip comparing the other colorimetry parameters
333 */
334 if (source_fmt.format.colorspace == V4L2_COLORSPACE_DEFAULT
335 || sink_fmt.format.colorspace == V4L2_COLORSPACE_DEFAULT)
336 return 0;
337
338 /* Colorspace must match. */
339 if (source_fmt.format.colorspace != sink_fmt.format.colorspace)
340 return -EPIPE;
341
342 /* Colorimetry must match if they are not set to DEFAULT */
343 if (source_fmt.format.ycbcr_enc != V4L2_YCBCR_ENC_DEFAULT
344 && sink_fmt.format.ycbcr_enc != V4L2_YCBCR_ENC_DEFAULT
345 && source_fmt.format.ycbcr_enc != sink_fmt.format.ycbcr_enc)
346 return -EPIPE;
347
348 if (source_fmt.format.quantization != V4L2_QUANTIZATION_DEFAULT
349 && sink_fmt.format.quantization != V4L2_QUANTIZATION_DEFAULT
350 && source_fmt.format.quantization != sink_fmt.format.quantization)
351 return -EPIPE;
352
353 if (source_fmt.format.xfer_func != V4L2_XFER_FUNC_DEFAULT
354 && sink_fmt.format.xfer_func != V4L2_XFER_FUNC_DEFAULT
355 && source_fmt.format.xfer_func != sink_fmt.format.xfer_func)
356 return -EPIPE;
357
358 return 0;
359}
360EXPORT_SYMBOL_GPL(vimc_link_validate);
361
362static const struct media_entity_operations vimc_ent_sd_mops = {
363 .link_validate = vimc_link_validate,
364};
365
366int vimc_ent_sd_register(struct vimc_ent_device *ved,
367 struct v4l2_subdev *sd,
368 struct v4l2_device *v4l2_dev,
369 const char *const name,
370 u32 function,
371 u16 num_pads,
372 const unsigned long *pads_flag,
373 const struct v4l2_subdev_internal_ops *sd_int_ops,
374 const struct v4l2_subdev_ops *sd_ops)
375{
376 int ret;
377
378 /* Allocate the pads */
379 ved->pads = vimc_pads_init(num_pads, pads_flag);
380 if (IS_ERR(ved->pads))
381 return PTR_ERR(ved->pads);
382
383 /* Fill the vimc_ent_device struct */
384 ved->ent = &sd->entity;
385
386 /* Initialize the subdev */
387 v4l2_subdev_init(sd, sd_ops);
388 sd->internal_ops = sd_int_ops;
389 sd->entity.function = function;
390 sd->entity.ops = &vimc_ent_sd_mops;
391 sd->owner = THIS_MODULE;
392 strscpy(sd->name, name, sizeof(sd->name));
393 v4l2_set_subdevdata(sd, ved);
394
395 /* Expose this subdev to user space */
396 sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
397 if (sd->ctrl_handler)
398 sd->flags |= V4L2_SUBDEV_FL_HAS_EVENTS;
399
400 /* Initialize the media entity */
401 ret = media_entity_pads_init(&sd->entity, num_pads, ved->pads);
402 if (ret)
403 goto err_clean_pads;
404
405 /* Register the subdev with the v4l2 and the media framework */
406 ret = v4l2_device_register_subdev(v4l2_dev, sd);
407 if (ret) {
408 dev_err(v4l2_dev->dev,
409 "%s: subdev register failed (err=%d)\n",
410 name, ret);
411 goto err_clean_m_ent;
412 }
413
414 return 0;
415
416err_clean_m_ent:
417 media_entity_cleanup(&sd->entity);
418err_clean_pads:
419 vimc_pads_cleanup(ved->pads);
420 return ret;
421}
422EXPORT_SYMBOL_GPL(vimc_ent_sd_register);
423
424void vimc_ent_sd_unregister(struct vimc_ent_device *ved, struct v4l2_subdev *sd)
425{
426 media_entity_cleanup(ved->ent);
427 vimc_pads_cleanup(ved->pads);
428 v4l2_device_unregister_subdev(sd);
429}
430EXPORT_SYMBOL_GPL(vimc_ent_sd_unregister);