1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * vimc-core.c Virtual Media Controller Driver
4 *
5 * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@gmail.com>
6 */
7
8 #include <linux/font.h>
9 #include <linux/init.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <media/media-device.h>
13 #include <media/tpg/v4l2-tpg.h>
14 #include <media/v4l2-device.h>
15
16 #include "vimc-common.h"
17
18 #define VIMC_MDEV_MODEL_NAME "VIMC MDEV"
19
20 #define VIMC_ENT_LINK(src, srcpad, sink, sinkpad, link_flags) { \
21 .src_ent = src, \
22 .src_pad = srcpad, \
23 .sink_ent = sink, \
24 .sink_pad = sinkpad, \
25 .flags = link_flags, \
26 }
27
28 /* Structure which describes links between entities */
29 struct vimc_ent_link {
30 unsigned int src_ent;
31 u16 src_pad;
32 unsigned int sink_ent;
33 u16 sink_pad;
34 u32 flags;
35 };
36
37 /* Structure which describes the whole topology */
38 struct vimc_pipeline_config {
39 const struct vimc_ent_config *ents;
40 size_t num_ents;
41 const struct vimc_ent_link *links;
42 size_t num_links;
43 };
44
45 /* --------------------------------------------------------------------------
46 * Topology Configuration
47 */
48
49 static struct vimc_ent_config ent_config[] = {
50 {
51 .name = "Sensor A",
52 .type = &vimc_sen_type
53 },
54 {
55 .name = "Sensor B",
56 .type = &vimc_sen_type
57 },
58 {
59 .name = "Debayer A",
60 .type = &vimc_deb_type
61 },
62 {
63 .name = "Debayer B",
64 .type = &vimc_deb_type
65 },
66 {
67 .name = "Raw Capture 0",
68 .type = &vimc_cap_type
69 },
70 {
71 .name = "Raw Capture 1",
72 .type = &vimc_cap_type
73 },
74 {
75 /* TODO: change this to vimc-input when it is implemented */
76 .name = "RGB/YUV Input",
77 .type = &vimc_sen_type
78 },
79 {
80 .name = "Scaler",
81 .type = &vimc_sca_type
82 },
83 {
84 .name = "RGB/YUV Capture",
85 .type = &vimc_cap_type
86 },
87 };
88
89 static const struct vimc_ent_link ent_links[] = {
90 /* Link: Sensor A (Pad 0)->(Pad 0) Debayer A */
91 VIMC_ENT_LINK(0, 0, 2, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
92 /* Link: Sensor A (Pad 0)->(Pad 0) Raw Capture 0 */
93 VIMC_ENT_LINK(0, 0, 4, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
94 /* Link: Sensor B (Pad 0)->(Pad 0) Debayer B */
95 VIMC_ENT_LINK(1, 0, 3, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
96 /* Link: Sensor B (Pad 0)->(Pad 0) Raw Capture 1 */
97 VIMC_ENT_LINK(1, 0, 5, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
98 /* Link: Debayer A (Pad 1)->(Pad 0) Scaler */
99 VIMC_ENT_LINK(2, 1, 7, 0, MEDIA_LNK_FL_ENABLED),
100 /* Link: Debayer B (Pad 1)->(Pad 0) Scaler */
101 VIMC_ENT_LINK(3, 1, 7, 0, 0),
102 /* Link: RGB/YUV Input (Pad 0)->(Pad 0) Scaler */
103 VIMC_ENT_LINK(6, 0, 7, 0, 0),
104 /* Link: Scaler (Pad 1)->(Pad 0) RGB/YUV Capture */
105 VIMC_ENT_LINK(7, 1, 8, 0, MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
106 };
107
108 static struct vimc_pipeline_config pipe_cfg = {
109 .ents = ent_config,
110 .num_ents = ARRAY_SIZE(ent_config),
111 .links = ent_links,
112 .num_links = ARRAY_SIZE(ent_links)
113 };
114
115 /* -------------------------------------------------------------------------- */
116
vimc_rm_links(struct vimc_device * vimc)117 static void vimc_rm_links(struct vimc_device *vimc)
118 {
119 unsigned int i;
120
121 for (i = 0; i < vimc->pipe_cfg->num_ents; i++)
122 media_entity_remove_links(vimc->ent_devs[i]->ent);
123 }
124
vimc_create_links(struct vimc_device * vimc)125 static int vimc_create_links(struct vimc_device *vimc)
126 {
127 unsigned int i;
128 int ret;
129
130 /* Initialize the links between entities */
131 for (i = 0; i < vimc->pipe_cfg->num_links; i++) {
132 const struct vimc_ent_link *link = &vimc->pipe_cfg->links[i];
133
134 struct vimc_ent_device *ved_src =
135 vimc->ent_devs[link->src_ent];
136 struct vimc_ent_device *ved_sink =
137 vimc->ent_devs[link->sink_ent];
138
139 ret = media_create_pad_link(ved_src->ent, link->src_pad,
140 ved_sink->ent, link->sink_pad,
141 link->flags);
142 if (ret)
143 goto err_rm_links;
144 }
145
146 return 0;
147
148 err_rm_links:
149 vimc_rm_links(vimc);
150 return ret;
151 }
152
vimc_release_subdevs(struct vimc_device * vimc)153 static void vimc_release_subdevs(struct vimc_device *vimc)
154 {
155 unsigned int i;
156
157 for (i = 0; i < vimc->pipe_cfg->num_ents; i++)
158 if (vimc->ent_devs[i])
159 vimc->pipe_cfg->ents[i].type->release(vimc->ent_devs[i]);
160 }
161
vimc_unregister_subdevs(struct vimc_device * vimc)162 static void vimc_unregister_subdevs(struct vimc_device *vimc)
163 {
164 unsigned int i;
165
166 for (i = 0; i < vimc->pipe_cfg->num_ents; i++)
167 if (vimc->ent_devs[i] && vimc->pipe_cfg->ents[i].type->unregister)
168 vimc->pipe_cfg->ents[i].type->unregister(vimc->ent_devs[i]);
169 }
170
vimc_add_subdevs(struct vimc_device * vimc)171 static int vimc_add_subdevs(struct vimc_device *vimc)
172 {
173 unsigned int i;
174
175 for (i = 0; i < vimc->pipe_cfg->num_ents; i++) {
176 dev_dbg(vimc->mdev.dev, "new entity for %s\n",
177 vimc->pipe_cfg->ents[i].name);
178 vimc->ent_devs[i] = vimc->pipe_cfg->ents[i].type->add(vimc,
179 vimc->pipe_cfg->ents[i].name);
180 if (IS_ERR(vimc->ent_devs[i])) {
181 int err = PTR_ERR(vimc->ent_devs[i]);
182
183 dev_err(vimc->mdev.dev, "adding entity %s failed (%d)\n",
184 vimc->pipe_cfg->ents[i].name, err);
185 vimc->ent_devs[i] = NULL;
186 vimc_unregister_subdevs(vimc);
187 vimc_release_subdevs(vimc);
188 return err;
189 }
190 }
191 return 0;
192 }
193
vimc_v4l2_dev_release(struct v4l2_device * v4l2_dev)194 static void vimc_v4l2_dev_release(struct v4l2_device *v4l2_dev)
195 {
196 struct vimc_device *vimc =
197 container_of(v4l2_dev, struct vimc_device, v4l2_dev);
198
199 vimc_release_subdevs(vimc);
200 media_device_cleanup(&vimc->mdev);
201 kfree(vimc->ent_devs);
202 kfree(vimc);
203 }
204
vimc_register_devices(struct vimc_device * vimc)205 static int vimc_register_devices(struct vimc_device *vimc)
206 {
207 int ret;
208
209 /* Register the v4l2 struct */
210 ret = v4l2_device_register(vimc->mdev.dev, &vimc->v4l2_dev);
211 if (ret) {
212 dev_err(vimc->mdev.dev,
213 "v4l2 device register failed (err=%d)\n", ret);
214 return ret;
215 }
216 /* allocate ent_devs */
217 vimc->ent_devs = kcalloc(vimc->pipe_cfg->num_ents,
218 sizeof(*vimc->ent_devs), GFP_KERNEL);
219 if (!vimc->ent_devs) {
220 ret = -ENOMEM;
221 goto err_v4l2_unregister;
222 }
223
224 /* Invoke entity config hooks to initialize and register subdevs */
225 ret = vimc_add_subdevs(vimc);
226 if (ret)
227 goto err_free_ent_devs;
228
229 /* Initialize links */
230 ret = vimc_create_links(vimc);
231 if (ret)
232 goto err_rm_subdevs;
233
234 /* Register the media device */
235 ret = media_device_register(&vimc->mdev);
236 if (ret) {
237 dev_err(vimc->mdev.dev,
238 "media device register failed (err=%d)\n", ret);
239 goto err_rm_subdevs;
240 }
241
242 /* Expose all subdev's nodes*/
243 ret = v4l2_device_register_subdev_nodes(&vimc->v4l2_dev);
244 if (ret) {
245 dev_err(vimc->mdev.dev,
246 "vimc subdev nodes registration failed (err=%d)\n",
247 ret);
248 goto err_mdev_unregister;
249 }
250
251 return 0;
252
253 err_mdev_unregister:
254 media_device_unregister(&vimc->mdev);
255 err_rm_subdevs:
256 vimc_unregister_subdevs(vimc);
257 vimc_release_subdevs(vimc);
258 err_free_ent_devs:
259 kfree(vimc->ent_devs);
260 err_v4l2_unregister:
261 v4l2_device_unregister(&vimc->v4l2_dev);
262
263 return ret;
264 }
265
vimc_probe(struct platform_device * pdev)266 static int vimc_probe(struct platform_device *pdev)
267 {
268 const struct font_desc *font = find_font("VGA8x16");
269 struct vimc_device *vimc;
270 int ret;
271
272 dev_dbg(&pdev->dev, "probe");
273
274 if (!font) {
275 dev_err(&pdev->dev, "could not find font\n");
276 return -ENODEV;
277 }
278
279 tpg_set_font(font->data);
280
281 vimc = kzalloc(sizeof(*vimc), GFP_KERNEL);
282 if (!vimc)
283 return -ENOMEM;
284
285 vimc->pipe_cfg = &pipe_cfg;
286
287 /* Link the media device within the v4l2_device */
288 vimc->v4l2_dev.mdev = &vimc->mdev;
289
290 /* Initialize media device */
291 strscpy(vimc->mdev.model, VIMC_MDEV_MODEL_NAME,
292 sizeof(vimc->mdev.model));
293 snprintf(vimc->mdev.bus_info, sizeof(vimc->mdev.bus_info),
294 "platform:%s", VIMC_PDEV_NAME);
295 vimc->mdev.dev = &pdev->dev;
296 media_device_init(&vimc->mdev);
297
298 ret = vimc_register_devices(vimc);
299 if (ret) {
300 media_device_cleanup(&vimc->mdev);
301 kfree(vimc);
302 return ret;
303 }
304 /*
305 * the release cb is set only after successful registration.
306 * if the registration fails, we release directly from probe
307 */
308
309 vimc->v4l2_dev.release = vimc_v4l2_dev_release;
310 platform_set_drvdata(pdev, vimc);
311 return 0;
312 }
313
vimc_remove(struct platform_device * pdev)314 static int vimc_remove(struct platform_device *pdev)
315 {
316 struct vimc_device *vimc = platform_get_drvdata(pdev);
317
318 dev_dbg(&pdev->dev, "remove");
319
320 vimc_unregister_subdevs(vimc);
321 media_device_unregister(&vimc->mdev);
322 v4l2_device_unregister(&vimc->v4l2_dev);
323 v4l2_device_put(&vimc->v4l2_dev);
324
325 return 0;
326 }
327
vimc_dev_release(struct device * dev)328 static void vimc_dev_release(struct device *dev)
329 {
330 }
331
332 static struct platform_device vimc_pdev = {
333 .name = VIMC_PDEV_NAME,
334 .dev.release = vimc_dev_release,
335 };
336
337 static struct platform_driver vimc_pdrv = {
338 .probe = vimc_probe,
339 .remove = vimc_remove,
340 .driver = {
341 .name = VIMC_PDEV_NAME,
342 },
343 };
344
vimc_init(void)345 static int __init vimc_init(void)
346 {
347 int ret;
348
349 ret = platform_device_register(&vimc_pdev);
350 if (ret) {
351 dev_err(&vimc_pdev.dev,
352 "platform device registration failed (err=%d)\n", ret);
353 return ret;
354 }
355
356 ret = platform_driver_register(&vimc_pdrv);
357 if (ret) {
358 dev_err(&vimc_pdev.dev,
359 "platform driver registration failed (err=%d)\n", ret);
360 platform_driver_unregister(&vimc_pdrv);
361 return ret;
362 }
363
364 return 0;
365 }
366
vimc_exit(void)367 static void __exit vimc_exit(void)
368 {
369 platform_driver_unregister(&vimc_pdrv);
370
371 platform_device_unregister(&vimc_pdev);
372 }
373
374 module_init(vimc_init);
375 module_exit(vimc_exit);
376
377 MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC)");
378 MODULE_AUTHOR("Helen Fornazier <helen.fornazier@gmail.com>");
379 MODULE_LICENSE("GPL");
380