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/dma-mapping.h>
9 #include <linux/font.h>
10 #include <linux/init.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 #include <media/media-device.h>
14 #include <media/tpg/v4l2-tpg.h>
15 #include <media/v4l2-device.h>
16
17 #include "vimc-common.h"
18
19 unsigned int vimc_allocator;
20 module_param_named(allocator, vimc_allocator, uint, 0444);
21 MODULE_PARM_DESC(allocator, " memory allocator selection, default is 0.\n"
22 "\t\t 0 == vmalloc\n"
23 "\t\t 1 == dma-contig");
24
25 #define VIMC_MDEV_MODEL_NAME "VIMC MDEV"
26
27 #define VIMC_DATA_LINK(src, srcpad, sink, sinkpad, link_flags) { \
28 .src_ent = src, \
29 .src_pad = srcpad, \
30 .sink_ent = sink, \
31 .sink_pad = sinkpad, \
32 .flags = link_flags, \
33 }
34
35 #define VIMC_ANCILLARY_LINK(primary, ancillary) { \
36 .primary_ent = primary, \
37 .ancillary_ent = ancillary \
38 }
39
40 /* Structure which describes data links between entities */
41 struct vimc_data_link {
42 unsigned int src_ent;
43 u16 src_pad;
44 unsigned int sink_ent;
45 u16 sink_pad;
46 u32 flags;
47 };
48
49 /* Enum to improve clarity when defining vimc_data_links */
50 enum vimc_data_link_ents {
51 SENSOR_A,
52 SENSOR_B,
53 DEBAYER_A,
54 DEBAYER_B,
55 RAW_CAPTURE_0,
56 RAW_CAPTURE_1,
57 RGB_YUV_INPUT,
58 SCALER,
59 RGB_YUV_CAPTURE,
60 LENS_A,
61 LENS_B,
62 };
63
64 /* Structure which describes ancillary links between entities */
65 struct vimc_ancillary_link {
66 unsigned int primary_ent;
67 unsigned int ancillary_ent;
68 };
69
70 /* Structure which describes the whole topology */
71 struct vimc_pipeline_config {
72 const struct vimc_ent_config *ents;
73 size_t num_ents;
74 const struct vimc_data_link *data_links;
75 size_t num_data_links;
76 const struct vimc_ancillary_link *ancillary_links;
77 size_t num_ancillary_links;
78 };
79
80 /* --------------------------------------------------------------------------
81 * Topology Configuration
82 */
83
84 static struct vimc_ent_config ent_config[] = {
85 [SENSOR_A] = {
86 .name = "Sensor A",
87 .type = &vimc_sensor_type
88 },
89 [SENSOR_B] = {
90 .name = "Sensor B",
91 .type = &vimc_sensor_type
92 },
93 [DEBAYER_A] = {
94 .name = "Debayer A",
95 .type = &vimc_debayer_type
96 },
97 [DEBAYER_B] = {
98 .name = "Debayer B",
99 .type = &vimc_debayer_type
100 },
101 [RAW_CAPTURE_0] = {
102 .name = "Raw Capture 0",
103 .type = &vimc_capture_type
104 },
105 [RAW_CAPTURE_1] = {
106 .name = "Raw Capture 1",
107 .type = &vimc_capture_type
108 },
109 [RGB_YUV_INPUT] = {
110 /* TODO: change this to vimc-input when it is implemented */
111 .name = "RGB/YUV Input",
112 .type = &vimc_sensor_type
113 },
114 [SCALER] = {
115 .name = "Scaler",
116 .type = &vimc_scaler_type
117 },
118 [RGB_YUV_CAPTURE] = {
119 .name = "RGB/YUV Capture",
120 .type = &vimc_capture_type
121 },
122 [LENS_A] = {
123 .name = "Lens A",
124 .type = &vimc_lens_type
125 },
126 [LENS_B] = {
127 .name = "Lens B",
128 .type = &vimc_lens_type
129 },
130 };
131
132 static const struct vimc_data_link data_links[] = {
133 /* Link: Sensor A (Pad 0)->(Pad 0) Debayer A */
134 VIMC_DATA_LINK(SENSOR_A, 0, DEBAYER_A, 0,
135 MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
136 /* Link: Sensor A (Pad 0)->(Pad 0) Raw Capture 0 */
137 VIMC_DATA_LINK(SENSOR_A, 0, RAW_CAPTURE_0, 0,
138 MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
139 /* Link: Sensor B (Pad 0)->(Pad 0) Debayer B */
140 VIMC_DATA_LINK(SENSOR_B, 0, DEBAYER_B, 0,
141 MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
142 /* Link: Sensor B (Pad 0)->(Pad 0) Raw Capture 1 */
143 VIMC_DATA_LINK(SENSOR_B, 0, RAW_CAPTURE_1, 0,
144 MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
145 /* Link: Debayer A (Pad 1)->(Pad 0) Scaler */
146 VIMC_DATA_LINK(DEBAYER_A, 1, SCALER, 0, MEDIA_LNK_FL_ENABLED),
147 /* Link: Debayer B (Pad 1)->(Pad 0) Scaler */
148 VIMC_DATA_LINK(DEBAYER_B, 1, SCALER, 0, 0),
149 /* Link: RGB/YUV Input (Pad 0)->(Pad 0) Scaler */
150 VIMC_DATA_LINK(RGB_YUV_INPUT, 0, SCALER, 0, 0),
151 /* Link: Scaler (Pad 1)->(Pad 0) RGB/YUV Capture */
152 VIMC_DATA_LINK(SCALER, 1, RGB_YUV_CAPTURE, 0,
153 MEDIA_LNK_FL_ENABLED | MEDIA_LNK_FL_IMMUTABLE),
154 };
155
156 static const struct vimc_ancillary_link ancillary_links[] = {
157 /* Link: Sensor A -> Lens A */
158 VIMC_ANCILLARY_LINK(0, 9),
159 /* Link: Sensor B -> Lens B */
160 VIMC_ANCILLARY_LINK(1, 10),
161 };
162
163 static struct vimc_pipeline_config pipe_cfg = {
164 .ents = ent_config,
165 .num_ents = ARRAY_SIZE(ent_config),
166 .data_links = data_links,
167 .num_data_links = ARRAY_SIZE(data_links),
168 .ancillary_links = ancillary_links,
169 .num_ancillary_links = ARRAY_SIZE(ancillary_links),
170 };
171
172 /* -------------------------------------------------------------------------- */
173
vimc_rm_links(struct vimc_device * vimc)174 static void vimc_rm_links(struct vimc_device *vimc)
175 {
176 unsigned int i;
177
178 for (i = 0; i < vimc->pipe_cfg->num_ents; i++)
179 media_entity_remove_links(vimc->ent_devs[i]->ent);
180 }
181
vimc_create_links(struct vimc_device * vimc)182 static int vimc_create_links(struct vimc_device *vimc)
183 {
184 unsigned int i;
185 int ret;
186
187 /* Initialize the links between entities */
188 for (i = 0; i < vimc->pipe_cfg->num_data_links; i++) {
189 const struct vimc_data_link *link = &vimc->pipe_cfg->data_links[i];
190
191 struct vimc_ent_device *ved_src =
192 vimc->ent_devs[link->src_ent];
193 struct vimc_ent_device *ved_sink =
194 vimc->ent_devs[link->sink_ent];
195
196 ret = media_create_pad_link(ved_src->ent, link->src_pad,
197 ved_sink->ent, link->sink_pad,
198 link->flags);
199 if (ret)
200 goto err_rm_links;
201 }
202
203 for (i = 0; i < vimc->pipe_cfg->num_ancillary_links; i++) {
204 const struct vimc_ancillary_link *link = &vimc->pipe_cfg->ancillary_links[i];
205
206 struct vimc_ent_device *ved_primary =
207 vimc->ent_devs[link->primary_ent];
208 struct vimc_ent_device *ved_ancillary =
209 vimc->ent_devs[link->ancillary_ent];
210 struct media_link *ret_link =
211 media_create_ancillary_link(ved_primary->ent, ved_ancillary->ent);
212
213 if (IS_ERR(ret_link)) {
214 ret = PTR_ERR(ret_link);
215 goto err_rm_links;
216 }
217 }
218
219 return 0;
220
221 err_rm_links:
222 vimc_rm_links(vimc);
223 return ret;
224 }
225
vimc_release_subdevs(struct vimc_device * vimc)226 static void vimc_release_subdevs(struct vimc_device *vimc)
227 {
228 unsigned int i;
229
230 for (i = 0; i < vimc->pipe_cfg->num_ents; i++)
231 if (vimc->ent_devs[i])
232 vimc->pipe_cfg->ents[i].type->release(vimc->ent_devs[i]);
233 }
234
vimc_unregister_subdevs(struct vimc_device * vimc)235 static void vimc_unregister_subdevs(struct vimc_device *vimc)
236 {
237 unsigned int i;
238
239 for (i = 0; i < vimc->pipe_cfg->num_ents; i++)
240 if (vimc->ent_devs[i] && vimc->pipe_cfg->ents[i].type->unregister)
241 vimc->pipe_cfg->ents[i].type->unregister(vimc->ent_devs[i]);
242 }
243
vimc_add_subdevs(struct vimc_device * vimc)244 static int vimc_add_subdevs(struct vimc_device *vimc)
245 {
246 unsigned int i;
247
248 for (i = 0; i < vimc->pipe_cfg->num_ents; i++) {
249 dev_dbg(vimc->mdev.dev, "new entity for %s\n",
250 vimc->pipe_cfg->ents[i].name);
251 vimc->ent_devs[i] = vimc->pipe_cfg->ents[i].type->add(vimc,
252 vimc->pipe_cfg->ents[i].name);
253 if (IS_ERR(vimc->ent_devs[i])) {
254 int err = PTR_ERR(vimc->ent_devs[i]);
255
256 dev_err(vimc->mdev.dev, "adding entity %s failed (%d)\n",
257 vimc->pipe_cfg->ents[i].name, err);
258 vimc->ent_devs[i] = NULL;
259 vimc_unregister_subdevs(vimc);
260 vimc_release_subdevs(vimc);
261 return err;
262 }
263 }
264 return 0;
265 }
266
vimc_v4l2_dev_release(struct v4l2_device * v4l2_dev)267 static void vimc_v4l2_dev_release(struct v4l2_device *v4l2_dev)
268 {
269 struct vimc_device *vimc =
270 container_of(v4l2_dev, struct vimc_device, v4l2_dev);
271
272 vimc_release_subdevs(vimc);
273 media_device_cleanup(&vimc->mdev);
274 kfree(vimc->ent_devs);
275 kfree(vimc);
276 }
277
vimc_register_devices(struct vimc_device * vimc)278 static int vimc_register_devices(struct vimc_device *vimc)
279 {
280 int ret;
281
282 /* Register the v4l2 struct */
283 ret = v4l2_device_register(vimc->mdev.dev, &vimc->v4l2_dev);
284 if (ret) {
285 dev_err(vimc->mdev.dev,
286 "v4l2 device register failed (err=%d)\n", ret);
287 return ret;
288 }
289 /* allocate ent_devs */
290 vimc->ent_devs = kcalloc(vimc->pipe_cfg->num_ents,
291 sizeof(*vimc->ent_devs), GFP_KERNEL);
292 if (!vimc->ent_devs) {
293 ret = -ENOMEM;
294 goto err_v4l2_unregister;
295 }
296
297 /* Invoke entity config hooks to initialize and register subdevs */
298 ret = vimc_add_subdevs(vimc);
299 if (ret)
300 goto err_free_ent_devs;
301
302 /* Initialize links */
303 ret = vimc_create_links(vimc);
304 if (ret)
305 goto err_rm_subdevs;
306
307 /* Register the media device */
308 ret = media_device_register(&vimc->mdev);
309 if (ret) {
310 dev_err(vimc->mdev.dev,
311 "media device register failed (err=%d)\n", ret);
312 goto err_rm_subdevs;
313 }
314
315 /* Expose all subdev's nodes*/
316 ret = v4l2_device_register_subdev_nodes(&vimc->v4l2_dev);
317 if (ret) {
318 dev_err(vimc->mdev.dev,
319 "vimc subdev nodes registration failed (err=%d)\n",
320 ret);
321 goto err_mdev_unregister;
322 }
323
324 return 0;
325
326 err_mdev_unregister:
327 media_device_unregister(&vimc->mdev);
328 err_rm_subdevs:
329 vimc_unregister_subdevs(vimc);
330 vimc_release_subdevs(vimc);
331 err_free_ent_devs:
332 kfree(vimc->ent_devs);
333 err_v4l2_unregister:
334 v4l2_device_unregister(&vimc->v4l2_dev);
335
336 return ret;
337 }
338
vimc_probe(struct platform_device * pdev)339 static int vimc_probe(struct platform_device *pdev)
340 {
341 const struct font_desc *font = find_font("VGA8x16");
342 struct vimc_device *vimc;
343 int ret;
344
345 dev_dbg(&pdev->dev, "probe");
346
347 if (!font) {
348 dev_err(&pdev->dev, "could not find font\n");
349 return -ENODEV;
350 }
351
352 tpg_set_font(font->data);
353
354 if (vimc_allocator == VIMC_ALLOCATOR_DMA_CONTIG)
355 dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
356
357 vimc = kzalloc(sizeof(*vimc), GFP_KERNEL);
358 if (!vimc)
359 return -ENOMEM;
360
361 vimc->pipe_cfg = &pipe_cfg;
362
363 /* Link the media device within the v4l2_device */
364 vimc->v4l2_dev.mdev = &vimc->mdev;
365
366 /* Initialize media device */
367 strscpy(vimc->mdev.model, VIMC_MDEV_MODEL_NAME,
368 sizeof(vimc->mdev.model));
369 snprintf(vimc->mdev.bus_info, sizeof(vimc->mdev.bus_info),
370 "platform:%s", VIMC_PDEV_NAME);
371 vimc->mdev.dev = &pdev->dev;
372 media_device_init(&vimc->mdev);
373
374 ret = vimc_register_devices(vimc);
375 if (ret) {
376 media_device_cleanup(&vimc->mdev);
377 kfree(vimc);
378 return ret;
379 }
380 /*
381 * the release cb is set only after successful registration.
382 * if the registration fails, we release directly from probe
383 */
384
385 vimc->v4l2_dev.release = vimc_v4l2_dev_release;
386 platform_set_drvdata(pdev, vimc);
387 return 0;
388 }
389
vimc_remove(struct platform_device * pdev)390 static int vimc_remove(struct platform_device *pdev)
391 {
392 struct vimc_device *vimc = platform_get_drvdata(pdev);
393
394 dev_dbg(&pdev->dev, "remove");
395
396 vimc_unregister_subdevs(vimc);
397 media_device_unregister(&vimc->mdev);
398 v4l2_device_unregister(&vimc->v4l2_dev);
399 v4l2_device_put(&vimc->v4l2_dev);
400
401 return 0;
402 }
403
vimc_dev_release(struct device * dev)404 static void vimc_dev_release(struct device *dev)
405 {
406 }
407
408 static struct platform_device vimc_pdev = {
409 .name = VIMC_PDEV_NAME,
410 .dev.release = vimc_dev_release,
411 };
412
413 static struct platform_driver vimc_pdrv = {
414 .probe = vimc_probe,
415 .remove = vimc_remove,
416 .driver = {
417 .name = VIMC_PDEV_NAME,
418 },
419 };
420
vimc_init(void)421 static int __init vimc_init(void)
422 {
423 int ret;
424
425 ret = platform_device_register(&vimc_pdev);
426 if (ret) {
427 dev_err(&vimc_pdev.dev,
428 "platform device registration failed (err=%d)\n", ret);
429 return ret;
430 }
431
432 ret = platform_driver_register(&vimc_pdrv);
433 if (ret) {
434 dev_err(&vimc_pdev.dev,
435 "platform driver registration failed (err=%d)\n", ret);
436 platform_device_unregister(&vimc_pdev);
437 return ret;
438 }
439
440 return 0;
441 }
442
vimc_exit(void)443 static void __exit vimc_exit(void)
444 {
445 platform_driver_unregister(&vimc_pdrv);
446
447 platform_device_unregister(&vimc_pdev);
448 }
449
450 module_init(vimc_init);
451 module_exit(vimc_exit);
452
453 MODULE_DESCRIPTION("Virtual Media Controller Driver (VIMC)");
454 MODULE_AUTHOR("Helen Fornazier <helen.fornazier@gmail.com>");
455 MODULE_LICENSE("GPL");
456