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WIP FPC-III support
[linux/fpc-iii.git] / drivers / media / v4l2-core / v4l2-fwnode.c
blob5353e37eb950e813e8a1db840aaa07294e6d0859
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * V4L2 fwnode binding parsing library
4 *
5 * The origins of the V4L2 fwnode library are in V4L2 OF library that
6 * formerly was located in v4l2-of.c.
7 *
8 * Copyright (c) 2016 Intel Corporation.
9 * Author: Sakari Ailus <sakari.ailus@linux.intel.com>
10 *
11 * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.
12 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
13 *
14 * Copyright (C) 2012 Renesas Electronics Corp.
15 * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
16 */
17 #include <linux/acpi.h>
18 #include <linux/kernel.h>
19 #include <linux/mm.h>
20 #include <linux/module.h>
21 #include <linux/of.h>
22 #include <linux/property.h>
23 #include <linux/slab.h>
24 #include <linux/string.h>
25 #include <linux/types.h>
26
27 #include <media/v4l2-async.h>
28 #include <media/v4l2-fwnode.h>
29 #include <media/v4l2-subdev.h>
30
31 enum v4l2_fwnode_bus_type {
32 V4L2_FWNODE_BUS_TYPE_GUESS = 0,
33 V4L2_FWNODE_BUS_TYPE_CSI2_CPHY,
34 V4L2_FWNODE_BUS_TYPE_CSI1,
35 V4L2_FWNODE_BUS_TYPE_CCP2,
36 V4L2_FWNODE_BUS_TYPE_CSI2_DPHY,
37 V4L2_FWNODE_BUS_TYPE_PARALLEL,
38 V4L2_FWNODE_BUS_TYPE_BT656,
39 NR_OF_V4L2_FWNODE_BUS_TYPE,
40 };
41
42 static const struct v4l2_fwnode_bus_conv {
43 enum v4l2_fwnode_bus_type fwnode_bus_type;
44 enum v4l2_mbus_type mbus_type;
45 const char *name;
46 } buses[] = {
47 {
48 V4L2_FWNODE_BUS_TYPE_GUESS,
49 V4L2_MBUS_UNKNOWN,
50 "not specified",
51 }, {
52 V4L2_FWNODE_BUS_TYPE_CSI2_CPHY,
53 V4L2_MBUS_CSI2_CPHY,
54 "MIPI CSI-2 C-PHY",
55 }, {
56 V4L2_FWNODE_BUS_TYPE_CSI1,
57 V4L2_MBUS_CSI1,
58 "MIPI CSI-1",
59 }, {
60 V4L2_FWNODE_BUS_TYPE_CCP2,
61 V4L2_MBUS_CCP2,
62 "compact camera port 2",
63 }, {
64 V4L2_FWNODE_BUS_TYPE_CSI2_DPHY,
65 V4L2_MBUS_CSI2_DPHY,
66 "MIPI CSI-2 D-PHY",
67 }, {
68 V4L2_FWNODE_BUS_TYPE_PARALLEL,
69 V4L2_MBUS_PARALLEL,
70 "parallel",
71 }, {
72 V4L2_FWNODE_BUS_TYPE_BT656,
73 V4L2_MBUS_BT656,
74 "Bt.656",
75 }
76 };
77
78 static const struct v4l2_fwnode_bus_conv *
79 get_v4l2_fwnode_bus_conv_by_fwnode_bus(enum v4l2_fwnode_bus_type type)
80 {
81 unsigned int i;
82
83 for (i = 0; i < ARRAY_SIZE(buses); i++)
84 if (buses[i].fwnode_bus_type == type)
85 return &buses[i];
86
87 return NULL;
88 }
89
90 static enum v4l2_mbus_type
91 v4l2_fwnode_bus_type_to_mbus(enum v4l2_fwnode_bus_type type)
92 {
93 const struct v4l2_fwnode_bus_conv *conv =
94 get_v4l2_fwnode_bus_conv_by_fwnode_bus(type);
95
96 return conv ? conv->mbus_type : V4L2_MBUS_INVALID;
97 }
98
99 static const char *
100 v4l2_fwnode_bus_type_to_string(enum v4l2_fwnode_bus_type type)
101 {
102 const struct v4l2_fwnode_bus_conv *conv =
103 get_v4l2_fwnode_bus_conv_by_fwnode_bus(type);
104
105 return conv ? conv->name : "not found";
106 }
107
108 static const struct v4l2_fwnode_bus_conv *
109 get_v4l2_fwnode_bus_conv_by_mbus(enum v4l2_mbus_type type)
110 {
111 unsigned int i;
112
113 for (i = 0; i < ARRAY_SIZE(buses); i++)
114 if (buses[i].mbus_type == type)
115 return &buses[i];
116
117 return NULL;
118 }
119
120 static const char *
121 v4l2_fwnode_mbus_type_to_string(enum v4l2_mbus_type type)
122 {
123 const struct v4l2_fwnode_bus_conv *conv =
124 get_v4l2_fwnode_bus_conv_by_mbus(type);
125
126 return conv ? conv->name : "not found";
127 }
128
129 static int v4l2_fwnode_endpoint_parse_csi2_bus(struct fwnode_handle *fwnode,
130 struct v4l2_fwnode_endpoint *vep,
131 enum v4l2_mbus_type bus_type)
132 {
133 struct v4l2_fwnode_bus_mipi_csi2 *bus = &vep->bus.mipi_csi2;
134 bool have_clk_lane = false, have_data_lanes = false,
135 have_lane_polarities = false;
136 unsigned int flags = 0, lanes_used = 0;
137 u32 array[1 + V4L2_FWNODE_CSI2_MAX_DATA_LANES];
138 u32 clock_lane = 0;
139 unsigned int num_data_lanes = 0;
140 bool use_default_lane_mapping = false;
141 unsigned int i;
142 u32 v;
143 int rval;
144
145 if (bus_type == V4L2_MBUS_CSI2_DPHY ||
146 bus_type == V4L2_MBUS_CSI2_CPHY) {
147 use_default_lane_mapping = true;
148
149 num_data_lanes = min_t(u32, bus->num_data_lanes,
150 V4L2_FWNODE_CSI2_MAX_DATA_LANES);
151
152 clock_lane = bus->clock_lane;
153 if (clock_lane)
154 use_default_lane_mapping = false;
155
156 for (i = 0; i < num_data_lanes; i++) {
157 array[i] = bus->data_lanes[i];
158 if (array[i])
159 use_default_lane_mapping = false;
160 }
161
162 if (use_default_lane_mapping)
163 pr_debug("no lane mapping given, using defaults\n");
164 }
165
166 rval = fwnode_property_count_u32(fwnode, "data-lanes");
167 if (rval > 0) {
168 num_data_lanes =
169 min_t(int, V4L2_FWNODE_CSI2_MAX_DATA_LANES, rval);
170
171 fwnode_property_read_u32_array(fwnode, "data-lanes", array,
172 num_data_lanes);
173
174 have_data_lanes = true;
175 if (use_default_lane_mapping) {
176 pr_debug("data-lanes property exists; disabling default mapping\n");
177 use_default_lane_mapping = false;
178 }
179 }
180
181 for (i = 0; i < num_data_lanes; i++) {
182 if (lanes_used & BIT(array[i])) {
183 if (have_data_lanes || !use_default_lane_mapping)
184 pr_warn("duplicated lane %u in data-lanes, using defaults\n",
185 array[i]);
186 use_default_lane_mapping = true;
187 }
188 lanes_used |= BIT(array[i]);
189
190 if (have_data_lanes)
191 pr_debug("lane %u position %u\n", i, array[i]);
192 }
193
194 rval = fwnode_property_count_u32(fwnode, "lane-polarities");
195 if (rval > 0) {
196 if (rval != 1 + num_data_lanes /* clock+data */) {
197 pr_warn("invalid number of lane-polarities entries (need %u, got %u)\n",
198 1 + num_data_lanes, rval);
199 return -EINVAL;
200 }
201
202 have_lane_polarities = true;
203 }
204
205 if (!fwnode_property_read_u32(fwnode, "clock-lanes", &v)) {
206 clock_lane = v;
207 pr_debug("clock lane position %u\n", v);
208 have_clk_lane = true;
209 }
210
211 if (have_clk_lane && lanes_used & BIT(clock_lane) &&
212 !use_default_lane_mapping) {
213 pr_warn("duplicated lane %u in clock-lanes, using defaults\n",
214 v);
215 use_default_lane_mapping = true;
216 }
217
218 if (fwnode_property_present(fwnode, "clock-noncontinuous")) {
219 flags |= V4L2_MBUS_CSI2_NONCONTINUOUS_CLOCK;
220 pr_debug("non-continuous clock\n");
221 } else {
222 flags |= V4L2_MBUS_CSI2_CONTINUOUS_CLOCK;
223 }
224
225 if (bus_type == V4L2_MBUS_CSI2_DPHY ||
226 bus_type == V4L2_MBUS_CSI2_CPHY || lanes_used ||
227 have_clk_lane || (flags & ~V4L2_MBUS_CSI2_CONTINUOUS_CLOCK)) {
228 /* Only D-PHY has a clock lane. */
229 unsigned int dfl_data_lane_index =
230 bus_type == V4L2_MBUS_CSI2_DPHY;
231
232 bus->flags = flags;
233 if (bus_type == V4L2_MBUS_UNKNOWN)
234 vep->bus_type = V4L2_MBUS_CSI2_DPHY;
235 bus->num_data_lanes = num_data_lanes;
236
237 if (use_default_lane_mapping) {
238 bus->clock_lane = 0;
239 for (i = 0; i < num_data_lanes; i++)
240 bus->data_lanes[i] = dfl_data_lane_index + i;
241 } else {
242 bus->clock_lane = clock_lane;
243 for (i = 0; i < num_data_lanes; i++)
244 bus->data_lanes[i] = array[i];
245 }
246
247 if (have_lane_polarities) {
248 fwnode_property_read_u32_array(fwnode,
249 "lane-polarities", array,
250 1 + num_data_lanes);
251
252 for (i = 0; i < 1 + num_data_lanes; i++) {
253 bus->lane_polarities[i] = array[i];
254 pr_debug("lane %u polarity %sinverted",
255 i, array[i] ? "" : "not ");
256 }
257 } else {
258 pr_debug("no lane polarities defined, assuming not inverted\n");
259 }
260 }
261
262 return 0;
263 }
264
265 #define PARALLEL_MBUS_FLAGS (V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
266 V4L2_MBUS_HSYNC_ACTIVE_LOW | \
267 V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
268 V4L2_MBUS_VSYNC_ACTIVE_LOW | \
269 V4L2_MBUS_FIELD_EVEN_HIGH | \
270 V4L2_MBUS_FIELD_EVEN_LOW)
271
272 static void
273 v4l2_fwnode_endpoint_parse_parallel_bus(struct fwnode_handle *fwnode,
274 struct v4l2_fwnode_endpoint *vep,
275 enum v4l2_mbus_type bus_type)
276 {
277 struct v4l2_fwnode_bus_parallel *bus = &vep->bus.parallel;
278 unsigned int flags = 0;
279 u32 v;
280
281 if (bus_type == V4L2_MBUS_PARALLEL || bus_type == V4L2_MBUS_BT656)
282 flags = bus->flags;
283
284 if (!fwnode_property_read_u32(fwnode, "hsync-active", &v)) {
285 flags &= ~(V4L2_MBUS_HSYNC_ACTIVE_HIGH |
286 V4L2_MBUS_HSYNC_ACTIVE_LOW);
287 flags |= v ? V4L2_MBUS_HSYNC_ACTIVE_HIGH :
288 V4L2_MBUS_HSYNC_ACTIVE_LOW;
289 pr_debug("hsync-active %s\n", v ? "high" : "low");
290 }
291
292 if (!fwnode_property_read_u32(fwnode, "vsync-active", &v)) {
293 flags &= ~(V4L2_MBUS_VSYNC_ACTIVE_HIGH |
294 V4L2_MBUS_VSYNC_ACTIVE_LOW);
295 flags |= v ? V4L2_MBUS_VSYNC_ACTIVE_HIGH :
296 V4L2_MBUS_VSYNC_ACTIVE_LOW;
297 pr_debug("vsync-active %s\n", v ? "high" : "low");
298 }
299
300 if (!fwnode_property_read_u32(fwnode, "field-even-active", &v)) {
301 flags &= ~(V4L2_MBUS_FIELD_EVEN_HIGH |
302 V4L2_MBUS_FIELD_EVEN_LOW);
303 flags |= v ? V4L2_MBUS_FIELD_EVEN_HIGH :
304 V4L2_MBUS_FIELD_EVEN_LOW;
305 pr_debug("field-even-active %s\n", v ? "high" : "low");
306 }
307
308 if (!fwnode_property_read_u32(fwnode, "pclk-sample", &v)) {
309 flags &= ~(V4L2_MBUS_PCLK_SAMPLE_RISING |
310 V4L2_MBUS_PCLK_SAMPLE_FALLING);
311 flags |= v ? V4L2_MBUS_PCLK_SAMPLE_RISING :
312 V4L2_MBUS_PCLK_SAMPLE_FALLING;
313 pr_debug("pclk-sample %s\n", v ? "high" : "low");
314 }
315
316 if (!fwnode_property_read_u32(fwnode, "data-active", &v)) {
317 flags &= ~(V4L2_MBUS_DATA_ACTIVE_HIGH |
318 V4L2_MBUS_DATA_ACTIVE_LOW);
319 flags |= v ? V4L2_MBUS_DATA_ACTIVE_HIGH :
320 V4L2_MBUS_DATA_ACTIVE_LOW;
321 pr_debug("data-active %s\n", v ? "high" : "low");
322 }
323
324 if (fwnode_property_present(fwnode, "slave-mode")) {
325 pr_debug("slave mode\n");
326 flags &= ~V4L2_MBUS_MASTER;
327 flags |= V4L2_MBUS_SLAVE;
328 } else {
329 flags &= ~V4L2_MBUS_SLAVE;
330 flags |= V4L2_MBUS_MASTER;
331 }
332
333 if (!fwnode_property_read_u32(fwnode, "bus-width", &v)) {
334 bus->bus_width = v;
335 pr_debug("bus-width %u\n", v);
336 }
337
338 if (!fwnode_property_read_u32(fwnode, "data-shift", &v)) {
339 bus->data_shift = v;
340 pr_debug("data-shift %u\n", v);
341 }
342
343 if (!fwnode_property_read_u32(fwnode, "sync-on-green-active", &v)) {
344 flags &= ~(V4L2_MBUS_VIDEO_SOG_ACTIVE_HIGH |
345 V4L2_MBUS_VIDEO_SOG_ACTIVE_LOW);
346 flags |= v ? V4L2_MBUS_VIDEO_SOG_ACTIVE_HIGH :
347 V4L2_MBUS_VIDEO_SOG_ACTIVE_LOW;
348 pr_debug("sync-on-green-active %s\n", v ? "high" : "low");
349 }
350
351 if (!fwnode_property_read_u32(fwnode, "data-enable-active", &v)) {
352 flags &= ~(V4L2_MBUS_DATA_ENABLE_HIGH |
353 V4L2_MBUS_DATA_ENABLE_LOW);
354 flags |= v ? V4L2_MBUS_DATA_ENABLE_HIGH :
355 V4L2_MBUS_DATA_ENABLE_LOW;
356 pr_debug("data-enable-active %s\n", v ? "high" : "low");
357 }
358
359 switch (bus_type) {
360 default:
361 bus->flags = flags;
362 if (flags & PARALLEL_MBUS_FLAGS)
363 vep->bus_type = V4L2_MBUS_PARALLEL;
364 else
365 vep->bus_type = V4L2_MBUS_BT656;
366 break;
367 case V4L2_MBUS_PARALLEL:
368 vep->bus_type = V4L2_MBUS_PARALLEL;
369 bus->flags = flags;
370 break;
371 case V4L2_MBUS_BT656:
372 vep->bus_type = V4L2_MBUS_BT656;
373 bus->flags = flags & ~PARALLEL_MBUS_FLAGS;
374 break;
375 }
376 }
377
378 static void
379 v4l2_fwnode_endpoint_parse_csi1_bus(struct fwnode_handle *fwnode,
380 struct v4l2_fwnode_endpoint *vep,
381 enum v4l2_mbus_type bus_type)
382 {
383 struct v4l2_fwnode_bus_mipi_csi1 *bus = &vep->bus.mipi_csi1;
384 u32 v;
385
386 if (!fwnode_property_read_u32(fwnode, "clock-inv", &v)) {
387 bus->clock_inv = v;
388 pr_debug("clock-inv %u\n", v);
389 }
390
391 if (!fwnode_property_read_u32(fwnode, "strobe", &v)) {
392 bus->strobe = v;
393 pr_debug("strobe %u\n", v);
394 }
395
396 if (!fwnode_property_read_u32(fwnode, "data-lanes", &v)) {
397 bus->data_lane = v;
398 pr_debug("data-lanes %u\n", v);
399 }
400
401 if (!fwnode_property_read_u32(fwnode, "clock-lanes", &v)) {
402 bus->clock_lane = v;
403 pr_debug("clock-lanes %u\n", v);
404 }
405
406 if (bus_type == V4L2_MBUS_CCP2)
407 vep->bus_type = V4L2_MBUS_CCP2;
408 else
409 vep->bus_type = V4L2_MBUS_CSI1;
410 }
411
412 static int __v4l2_fwnode_endpoint_parse(struct fwnode_handle *fwnode,
413 struct v4l2_fwnode_endpoint *vep)
414 {
415 u32 bus_type = V4L2_FWNODE_BUS_TYPE_GUESS;
416 enum v4l2_mbus_type mbus_type;
417 int rval;
418
419 pr_debug("===== begin parsing endpoint %pfw\n", fwnode);
420
421 fwnode_property_read_u32(fwnode, "bus-type", &bus_type);
422 pr_debug("fwnode video bus type %s (%u), mbus type %s (%u)\n",
423 v4l2_fwnode_bus_type_to_string(bus_type), bus_type,
424 v4l2_fwnode_mbus_type_to_string(vep->bus_type),
425 vep->bus_type);
426 mbus_type = v4l2_fwnode_bus_type_to_mbus(bus_type);
427 if (mbus_type == V4L2_MBUS_INVALID) {
428 pr_debug("unsupported bus type %u\n", bus_type);
429 return -EINVAL;
430 }
431
432 if (vep->bus_type != V4L2_MBUS_UNKNOWN) {
433 if (mbus_type != V4L2_MBUS_UNKNOWN &&
434 vep->bus_type != mbus_type) {
435 pr_debug("expecting bus type %s\n",
436 v4l2_fwnode_mbus_type_to_string(vep->bus_type));
437 return -ENXIO;
438 }
439 } else {
440 vep->bus_type = mbus_type;
441 }
442
443 switch (vep->bus_type) {
444 case V4L2_MBUS_UNKNOWN:
445 rval = v4l2_fwnode_endpoint_parse_csi2_bus(fwnode, vep,
446 V4L2_MBUS_UNKNOWN);
447 if (rval)
448 return rval;
449
450 if (vep->bus_type == V4L2_MBUS_UNKNOWN)
451 v4l2_fwnode_endpoint_parse_parallel_bus(fwnode, vep,
452 V4L2_MBUS_UNKNOWN);
453
454 pr_debug("assuming media bus type %s (%u)\n",
455 v4l2_fwnode_mbus_type_to_string(vep->bus_type),
456 vep->bus_type);
457
458 break;
459 case V4L2_MBUS_CCP2:
460 case V4L2_MBUS_CSI1:
461 v4l2_fwnode_endpoint_parse_csi1_bus(fwnode, vep, vep->bus_type);
462
463 break;
464 case V4L2_MBUS_CSI2_DPHY:
465 case V4L2_MBUS_CSI2_CPHY:
466 rval = v4l2_fwnode_endpoint_parse_csi2_bus(fwnode, vep,
467 vep->bus_type);
468 if (rval)
469 return rval;
470
471 break;
472 case V4L2_MBUS_PARALLEL:
473 case V4L2_MBUS_BT656:
474 v4l2_fwnode_endpoint_parse_parallel_bus(fwnode, vep,
475 vep->bus_type);
476
477 break;
478 default:
479 pr_warn("unsupported bus type %u\n", mbus_type);
480 return -EINVAL;
481 }
482
483 fwnode_graph_parse_endpoint(fwnode, &vep->base);
484
485 return 0;
486 }
487
488 int v4l2_fwnode_endpoint_parse(struct fwnode_handle *fwnode,
489 struct v4l2_fwnode_endpoint *vep)
490 {
491 int ret;
492
493 ret = __v4l2_fwnode_endpoint_parse(fwnode, vep);
494
495 pr_debug("===== end parsing endpoint %pfw\n", fwnode);
496
497 return ret;
498 }
499 EXPORT_SYMBOL_GPL(v4l2_fwnode_endpoint_parse);
500
501 void v4l2_fwnode_endpoint_free(struct v4l2_fwnode_endpoint *vep)
502 {
503 if (IS_ERR_OR_NULL(vep))
504 return;
505
506 kfree(vep->link_frequencies);
507 vep->link_frequencies = NULL;
508 }
509 EXPORT_SYMBOL_GPL(v4l2_fwnode_endpoint_free);
510
511 int v4l2_fwnode_endpoint_alloc_parse(struct fwnode_handle *fwnode,
512 struct v4l2_fwnode_endpoint *vep)
513 {
514 int rval;
515
516 rval = __v4l2_fwnode_endpoint_parse(fwnode, vep);
517 if (rval < 0)
518 return rval;
519
520 rval = fwnode_property_count_u64(fwnode, "link-frequencies");
521 if (rval > 0) {
522 unsigned int i;
523
524 vep->link_frequencies =
525 kmalloc_array(rval, sizeof(*vep->link_frequencies),
526 GFP_KERNEL);
527 if (!vep->link_frequencies)
528 return -ENOMEM;
529
530 vep->nr_of_link_frequencies = rval;
531
532 rval = fwnode_property_read_u64_array(fwnode,
533 "link-frequencies",
534 vep->link_frequencies,
535 vep->nr_of_link_frequencies);
536 if (rval < 0) {
537 v4l2_fwnode_endpoint_free(vep);
538 return rval;
539 }
540
541 for (i = 0; i < vep->nr_of_link_frequencies; i++)
542 pr_debug("link-frequencies %u value %llu\n", i,
543 vep->link_frequencies[i]);
544 }
545
546 pr_debug("===== end parsing endpoint %pfw\n", fwnode);
547
548 return 0;
549 }
550 EXPORT_SYMBOL_GPL(v4l2_fwnode_endpoint_alloc_parse);
551
552 int v4l2_fwnode_parse_link(struct fwnode_handle *fwnode,
553 struct v4l2_fwnode_link *link)
554 {
555 struct fwnode_endpoint fwep;
556
557 memset(link, 0, sizeof(*link));
558
559 fwnode_graph_parse_endpoint(fwnode, &fwep);
560 link->local_id = fwep.id;
561 link->local_port = fwep.port;
562 link->local_node = fwnode_graph_get_port_parent(fwnode);
563
564 fwnode = fwnode_graph_get_remote_endpoint(fwnode);
565 if (!fwnode) {
566 fwnode_handle_put(fwnode);
567 return -ENOLINK;
568 }
569
570 fwnode_graph_parse_endpoint(fwnode, &fwep);
571 link->remote_id = fwep.id;
572 link->remote_port = fwep.port;
573 link->remote_node = fwnode_graph_get_port_parent(fwnode);
574
575 return 0;
576 }
577 EXPORT_SYMBOL_GPL(v4l2_fwnode_parse_link);
578
579 void v4l2_fwnode_put_link(struct v4l2_fwnode_link *link)
580 {
581 fwnode_handle_put(link->local_node);
582 fwnode_handle_put(link->remote_node);
583 }
584 EXPORT_SYMBOL_GPL(v4l2_fwnode_put_link);
585
586 static const struct v4l2_fwnode_connector_conv {
587 enum v4l2_connector_type type;
588 const char *compatible;
589 } connectors[] = {
590 {
591 .type = V4L2_CONN_COMPOSITE,
592 .compatible = "composite-video-connector",
593 }, {
594 .type = V4L2_CONN_SVIDEO,
595 .compatible = "svideo-connector",
596 },
597 };
598
599 static enum v4l2_connector_type
600 v4l2_fwnode_string_to_connector_type(const char *con_str)
601 {
602 unsigned int i;
603
604 for (i = 0; i < ARRAY_SIZE(connectors); i++)
605 if (!strcmp(con_str, connectors[i].compatible))
606 return connectors[i].type;
607
608 return V4L2_CONN_UNKNOWN;
609 }
610
611 static void
612 v4l2_fwnode_connector_parse_analog(struct fwnode_handle *fwnode,
613 struct v4l2_fwnode_connector *vc)
614 {
615 u32 stds;
616 int ret;
617
618 ret = fwnode_property_read_u32(fwnode, "sdtv-standards", &stds);
619
620 /* The property is optional. */
621 vc->connector.analog.sdtv_stds = ret ? V4L2_STD_ALL : stds;
622 }
623
624 void v4l2_fwnode_connector_free(struct v4l2_fwnode_connector *connector)
625 {
626 struct v4l2_connector_link *link, *tmp;
627
628 if (IS_ERR_OR_NULL(connector) || connector->type == V4L2_CONN_UNKNOWN)
629 return;
630
631 list_for_each_entry_safe(link, tmp, &connector->links, head) {
632 v4l2_fwnode_put_link(&link->fwnode_link);
633 list_del(&link->head);
634 kfree(link);
635 }
636
637 kfree(connector->label);
638 connector->label = NULL;
639 connector->type = V4L2_CONN_UNKNOWN;
640 }
641 EXPORT_SYMBOL_GPL(v4l2_fwnode_connector_free);
642
643 static enum v4l2_connector_type
644 v4l2_fwnode_get_connector_type(struct fwnode_handle *fwnode)
645 {
646 const char *type_name;
647 int err;
648
649 if (!fwnode)
650 return V4L2_CONN_UNKNOWN;
651
652 /* The connector-type is stored within the compatible string. */
653 err = fwnode_property_read_string(fwnode, "compatible", &type_name);
654 if (err)
655 return V4L2_CONN_UNKNOWN;
656
657 return v4l2_fwnode_string_to_connector_type(type_name);
658 }
659
660 int v4l2_fwnode_connector_parse(struct fwnode_handle *fwnode,
661 struct v4l2_fwnode_connector *connector)
662 {
663 struct fwnode_handle *connector_node;
664 enum v4l2_connector_type connector_type;
665 const char *label;
666 int err;
667
668 if (!fwnode)
669 return -EINVAL;
670
671 memset(connector, 0, sizeof(*connector));
672
673 INIT_LIST_HEAD(&connector->links);
674
675 connector_node = fwnode_graph_get_port_parent(fwnode);
676 connector_type = v4l2_fwnode_get_connector_type(connector_node);
677 if (connector_type == V4L2_CONN_UNKNOWN) {
678 fwnode_handle_put(connector_node);
679 connector_node = fwnode_graph_get_remote_port_parent(fwnode);
680 connector_type = v4l2_fwnode_get_connector_type(connector_node);
681 }
682
683 if (connector_type == V4L2_CONN_UNKNOWN) {
684 pr_err("Unknown connector type\n");
685 err = -ENOTCONN;
686 goto out;
687 }
688
689 connector->type = connector_type;
690 connector->name = fwnode_get_name(connector_node);
691 err = fwnode_property_read_string(connector_node, "label", &label);
692 connector->label = err ? NULL : kstrdup_const(label, GFP_KERNEL);
693
694 /* Parse the connector specific properties. */
695 switch (connector->type) {
696 case V4L2_CONN_COMPOSITE:
697 case V4L2_CONN_SVIDEO:
698 v4l2_fwnode_connector_parse_analog(connector_node, connector);
699 break;
700 /* Avoid compiler warnings */
701 case V4L2_CONN_UNKNOWN:
702 break;
703 }
704
705 out:
706 fwnode_handle_put(connector_node);
707
708 return err;
709 }
710 EXPORT_SYMBOL_GPL(v4l2_fwnode_connector_parse);
711
712 int v4l2_fwnode_connector_add_link(struct fwnode_handle *fwnode,
713 struct v4l2_fwnode_connector *connector)
714 {
715 struct fwnode_handle *connector_ep;
716 struct v4l2_connector_link *link;
717 int err;
718
719 if (!fwnode || !connector || connector->type == V4L2_CONN_UNKNOWN)
720 return -EINVAL;
721
722 connector_ep = fwnode_graph_get_remote_endpoint(fwnode);
723 if (!connector_ep)
724 return -ENOTCONN;
725
726 link = kzalloc(sizeof(*link), GFP_KERNEL);
727 if (!link) {
728 err = -ENOMEM;
729 goto err;
730 }
731
732 err = v4l2_fwnode_parse_link(connector_ep, &link->fwnode_link);
733 if (err)
734 goto err;
735
736 fwnode_handle_put(connector_ep);
737
738 list_add(&link->head, &connector->links);
739 connector->nr_of_links++;
740
741 return 0;
742
743 err:
744 kfree(link);
745 fwnode_handle_put(connector_ep);
746
747 return err;
748 }
749 EXPORT_SYMBOL_GPL(v4l2_fwnode_connector_add_link);
750
751 int v4l2_fwnode_device_parse(struct device *dev,
752 struct v4l2_fwnode_device_properties *props)
753 {
754 struct fwnode_handle *fwnode = dev_fwnode(dev);
755 u32 val;
756 int ret;
757
758 memset(props, 0, sizeof(*props));
759
760 props->orientation = V4L2_FWNODE_PROPERTY_UNSET;
761 ret = fwnode_property_read_u32(fwnode, "orientation", &val);
762 if (!ret) {
763 switch (val) {
764 case V4L2_FWNODE_ORIENTATION_FRONT:
765 case V4L2_FWNODE_ORIENTATION_BACK:
766 case V4L2_FWNODE_ORIENTATION_EXTERNAL:
767 break;
768 default:
769 dev_warn(dev, "Unsupported device orientation: %u\n", val);
770 return -EINVAL;
771 }
772
773 props->orientation = val;
774 dev_dbg(dev, "device orientation: %u\n", val);
775 }
776
777 props->rotation = V4L2_FWNODE_PROPERTY_UNSET;
778 ret = fwnode_property_read_u32(fwnode, "rotation", &val);
779 if (!ret) {
780 if (val >= 360) {
781 dev_warn(dev, "Unsupported device rotation: %u\n", val);
782 return -EINVAL;
783 }
784
785 props->rotation = val;
786 dev_dbg(dev, "device rotation: %u\n", val);
787 }
788
789 return 0;
790 }
791 EXPORT_SYMBOL_GPL(v4l2_fwnode_device_parse);
792
793 static int
794 v4l2_async_notifier_fwnode_parse_endpoint(struct device *dev,
795 struct v4l2_async_notifier *notifier,
796 struct fwnode_handle *endpoint,
797 unsigned int asd_struct_size,
798 parse_endpoint_func parse_endpoint)
799 {
800 struct v4l2_fwnode_endpoint vep = { .bus_type = 0 };
801 struct v4l2_async_subdev *asd;
802 int ret;
803
804 asd = kzalloc(asd_struct_size, GFP_KERNEL);
805 if (!asd)
806 return -ENOMEM;
807
808 asd->match_type = V4L2_ASYNC_MATCH_FWNODE;
809 asd->match.fwnode =
810 fwnode_graph_get_remote_port_parent(endpoint);
811 if (!asd->match.fwnode) {
812 dev_dbg(dev, "no remote endpoint found\n");
813 ret = -ENOTCONN;
814 goto out_err;
815 }
816
817 ret = v4l2_fwnode_endpoint_alloc_parse(endpoint, &vep);
818 if (ret) {
819 dev_warn(dev, "unable to parse V4L2 fwnode endpoint (%d)\n",
820 ret);
821 goto out_err;
822 }
823
824 ret = parse_endpoint ? parse_endpoint(dev, &vep, asd) : 0;
825 if (ret == -ENOTCONN)
826 dev_dbg(dev, "ignoring port@%u/endpoint@%u\n", vep.base.port,
827 vep.base.id);
828 else if (ret < 0)
829 dev_warn(dev,
830 "driver could not parse port@%u/endpoint@%u (%d)\n",
831 vep.base.port, vep.base.id, ret);
832 v4l2_fwnode_endpoint_free(&vep);
833 if (ret < 0)
834 goto out_err;
835
836 ret = v4l2_async_notifier_add_subdev(notifier, asd);
837 if (ret < 0) {
838 /* not an error if asd already exists */
839 if (ret == -EEXIST)
840 ret = 0;
841 goto out_err;
842 }
843
844 return 0;
845
846 out_err:
847 fwnode_handle_put(asd->match.fwnode);
848 kfree(asd);
849
850 return ret == -ENOTCONN ? 0 : ret;
851 }
852
853 static int
854 __v4l2_async_notifier_parse_fwnode_ep(struct device *dev,
855 struct v4l2_async_notifier *notifier,
856 size_t asd_struct_size,
857 unsigned int port,
858 bool has_port,
859 parse_endpoint_func parse_endpoint)
860 {
861 struct fwnode_handle *fwnode;
862 int ret = 0;
863
864 if (WARN_ON(asd_struct_size < sizeof(struct v4l2_async_subdev)))
865 return -EINVAL;
866
867 fwnode_graph_for_each_endpoint(dev_fwnode(dev), fwnode) {
868 struct fwnode_handle *dev_fwnode;
869 bool is_available;
870
871 dev_fwnode = fwnode_graph_get_port_parent(fwnode);
872 is_available = fwnode_device_is_available(dev_fwnode);
873 fwnode_handle_put(dev_fwnode);
874 if (!is_available)
875 continue;
876
877 if (has_port) {
878 struct fwnode_endpoint ep;
879
880 ret = fwnode_graph_parse_endpoint(fwnode, &ep);
881 if (ret)
882 break;
883
884 if (ep.port != port)
885 continue;
886 }
887
888 ret = v4l2_async_notifier_fwnode_parse_endpoint(dev,
889 notifier,
890 fwnode,
891 asd_struct_size,
892 parse_endpoint);
893 if (ret < 0)
894 break;
895 }
896
897 fwnode_handle_put(fwnode);
898
899 return ret;
900 }
901
902 int
903 v4l2_async_notifier_parse_fwnode_endpoints(struct device *dev,
904 struct v4l2_async_notifier *notifier,
905 size_t asd_struct_size,
906 parse_endpoint_func parse_endpoint)
907 {
908 return __v4l2_async_notifier_parse_fwnode_ep(dev, notifier,
909 asd_struct_size, 0,
910 false, parse_endpoint);
911 }
912 EXPORT_SYMBOL_GPL(v4l2_async_notifier_parse_fwnode_endpoints);
913
914 /*
915 * v4l2_fwnode_reference_parse - parse references for async sub-devices
916 * @dev: the device node the properties of which are parsed for references
917 * @notifier: the async notifier where the async subdevs will be added
918 * @prop: the name of the property
919 *
920 * Return: 0 on success
921 * -ENOENT if no entries were found
922 * -ENOMEM if memory allocation failed
923 * -EINVAL if property parsing failed
924 */
925 static int v4l2_fwnode_reference_parse(struct device *dev,
926 struct v4l2_async_notifier *notifier,
927 const char *prop)
928 {
929 struct fwnode_reference_args args;
930 unsigned int index;
931 int ret;
932
933 for (index = 0;
934 !(ret = fwnode_property_get_reference_args(dev_fwnode(dev),
935 prop, NULL, 0,
936 index, &args));
937 index++)
938 fwnode_handle_put(args.fwnode);
939
940 if (!index)
941 return -ENOENT;
942
943 /*
944 * Note that right now both -ENODATA and -ENOENT may signal
945 * out-of-bounds access. Return the error in cases other than that.
946 */
947 if (ret != -ENOENT && ret != -ENODATA)
948 return ret;
949
950 for (index = 0;
951 !fwnode_property_get_reference_args(dev_fwnode(dev), prop, NULL,
952 0, index, &args);
953 index++) {
954 struct v4l2_async_subdev *asd;
955
956 asd = v4l2_async_notifier_add_fwnode_subdev(notifier,
957 args.fwnode,
958 sizeof(*asd));
959 fwnode_handle_put(args.fwnode);
960 if (IS_ERR(asd)) {
961 /* not an error if asd already exists */
962 if (PTR_ERR(asd) == -EEXIST)
963 continue;
964
965 return PTR_ERR(asd);
966 }
967 }
968
969 return 0;
970 }
971
972 /*
973 * v4l2_fwnode_reference_get_int_prop - parse a reference with integer
974 * arguments
975 * @fwnode: fwnode to read @prop from
976 * @notifier: notifier for @dev
977 * @prop: the name of the property
978 * @index: the index of the reference to get
979 * @props: the array of integer property names
980 * @nprops: the number of integer property names in @nprops
981 *
982 * First find an fwnode referred to by the reference at @index in @prop.
983 *
984 * Then under that fwnode, @nprops times, for each property in @props,
985 * iteratively follow child nodes starting from fwnode such that they have the
986 * property in @props array at the index of the child node distance from the
987 * root node and the value of that property matching with the integer argument
988 * of the reference, at the same index.
989 *
990 * The child fwnode reached at the end of the iteration is then returned to the
991 * caller.
992 *
993 * The core reason for this is that you cannot refer to just any node in ACPI.
994 * So to refer to an endpoint (easy in DT) you need to refer to a device, then
995 * provide a list of (property name, property value) tuples where each tuple
996 * uniquely identifies a child node. The first tuple identifies a child directly
997 * underneath the device fwnode, the next tuple identifies a child node
998 * underneath the fwnode identified by the previous tuple, etc. until you
999 * reached the fwnode you need.
1000 *
1001 * THIS EXAMPLE EXISTS MERELY TO DOCUMENT THIS FUNCTION. DO NOT USE IT AS A
1002 * REFERENCE IN HOW ACPI TABLES SHOULD BE WRITTEN!! See documentation under
1003 * Documentation/firmware-guide/acpi/dsd/ instead and especially graph.txt,
1004 * data-node-references.txt and leds.txt .
1005 *
1006 * Scope (\_SB.PCI0.I2C2)
1007 * {
1008 * Device (CAM0)
1009 * {
1010 * Name (_DSD, Package () {
1011 * ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
1012 * Package () {
1013 * Package () {
1014 * "compatible",
1015 * Package () { "nokia,smia" }
1016 * },
1017 * },
1018 * ToUUID("dbb8e3e6-5886-4ba6-8795-1319f52a966b"),
1019 * Package () {
1020 * Package () { "port0", "PRT0" },
1021 * }
1022 * })
1023 * Name (PRT0, Package() {
1024 * ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
1025 * Package () {
1026 * Package () { "port", 0 },
1027 * },
1028 * ToUUID("dbb8e3e6-5886-4ba6-8795-1319f52a966b"),
1029 * Package () {
1030 * Package () { "endpoint0", "EP00" },
1031 * }
1032 * })
1033 * Name (EP00, Package() {
1034 * ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
1035 * Package () {
1036 * Package () { "endpoint", 0 },
1037 * Package () {
1038 * "remote-endpoint",
1039 * Package() {
1040 * \_SB.PCI0.ISP, 4, 0
1041 * }
1042 * },
1043 * }
1044 * })
1045 * }
1046 * }
1047 *
1048 * Scope (\_SB.PCI0)
1049 * {
1050 * Device (ISP)
1051 * {
1052 * Name (_DSD, Package () {
1053 * ToUUID("dbb8e3e6-5886-4ba6-8795-1319f52a966b"),
1054 * Package () {
1055 * Package () { "port4", "PRT4" },
1056 * }
1057 * })
1058 *
1059 * Name (PRT4, Package() {
1060 * ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
1061 * Package () {
1062 * Package () { "port", 4 },
1063 * },
1064 * ToUUID("dbb8e3e6-5886-4ba6-8795-1319f52a966b"),
1065 * Package () {
1066 * Package () { "endpoint0", "EP40" },
1067 * }
1068 * })
1069 *
1070 * Name (EP40, Package() {
1071 * ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
1072 * Package () {
1073 * Package () { "endpoint", 0 },
1074 * Package () {
1075 * "remote-endpoint",
1076 * Package () {
1077 * \_SB.PCI0.I2C2.CAM0,
1078 * 0, 0
1079 * }
1080 * },
1081 * }
1082 * })
1083 * }
1084 * }
1085 *
1086 * From the EP40 node under ISP device, you could parse the graph remote
1087 * endpoint using v4l2_fwnode_reference_get_int_prop with these arguments:
1088 *
1089 * @fwnode: fwnode referring to EP40 under ISP.
1090 * @prop: "remote-endpoint"
1091 * @index: 0
1092 * @props: "port", "endpoint"
1093 * @nprops: 2
1094 *
1095 * And you'd get back fwnode referring to EP00 under CAM0.
1096 *
1097 * The same works the other way around: if you use EP00 under CAM0 as the
1098 * fwnode, you'll get fwnode referring to EP40 under ISP.
1099 *
1100 * The same example in DT syntax would look like this:
1101 *
1102 * cam: cam0 {
1103 * compatible = "nokia,smia";
1104 *
1105 * port {
1106 * port = <0>;
1107 * endpoint {
1108 * endpoint = <0>;
1109 * remote-endpoint = <&isp 4 0>;
1110 * };
1111 * };
1112 * };
1113 *
1114 * isp: isp {
1115 * ports {
1116 * port@4 {
1117 * port = <4>;
1118 * endpoint {
1119 * endpoint = <0>;
1120 * remote-endpoint = <&cam 0 0>;
1121 * };
1122 * };
1123 * };
1124 * };
1125 *
1126 * Return: 0 on success
1127 * -ENOENT if no entries (or the property itself) were found
1128 * -EINVAL if property parsing otherwise failed
1129 * -ENOMEM if memory allocation failed
1130 */
1131 static struct fwnode_handle *
1132 v4l2_fwnode_reference_get_int_prop(struct fwnode_handle *fwnode,
1133 const char *prop,
1134 unsigned int index,
1135 const char * const *props,
1136 unsigned int nprops)
1137 {
1138 struct fwnode_reference_args fwnode_args;
1139 u64 *args = fwnode_args.args;
1140 struct fwnode_handle *child;
1141 int ret;
1142
1143 /*
1144 * Obtain remote fwnode as well as the integer arguments.
1145 *
1146 * Note that right now both -ENODATA and -ENOENT may signal
1147 * out-of-bounds access. Return -ENOENT in that case.
1148 */
1149 ret = fwnode_property_get_reference_args(fwnode, prop, NULL, nprops,
1150 index, &fwnode_args);
1151 if (ret)
1152 return ERR_PTR(ret == -ENODATA ? -ENOENT : ret);
1153
1154 /*
1155 * Find a node in the tree under the referred fwnode corresponding to
1156 * the integer arguments.
1157 */
1158 fwnode = fwnode_args.fwnode;
1159 while (nprops--) {
1160 u32 val;
1161
1162 /* Loop over all child nodes under fwnode. */
1163 fwnode_for_each_child_node(fwnode, child) {
1164 if (fwnode_property_read_u32(child, *props, &val))
1165 continue;
1166
1167 /* Found property, see if its value matches. */
1168 if (val == *args)
1169 break;
1170 }
1171
1172 fwnode_handle_put(fwnode);
1173
1174 /* No property found; return an error here. */
1175 if (!child) {
1176 fwnode = ERR_PTR(-ENOENT);
1177 break;
1178 }
1179
1180 props++;
1181 args++;
1182 fwnode = child;
1183 }
1184
1185 return fwnode;
1186 }
1187
1188 struct v4l2_fwnode_int_props {
1189 const char *name;
1190 const char * const *props;
1191 unsigned int nprops;
1192 };
1193
1194 /*
1195 * v4l2_fwnode_reference_parse_int_props - parse references for async
1196 * sub-devices
1197 * @dev: struct device pointer
1198 * @notifier: notifier for @dev
1199 * @prop: the name of the property
1200 * @props: the array of integer property names
1201 * @nprops: the number of integer properties
1202 *
1203 * Use v4l2_fwnode_reference_get_int_prop to find fwnodes through reference in
1204 * property @prop with integer arguments with child nodes matching in properties
1205 * @props. Then, set up V4L2 async sub-devices for those fwnodes in the notifier
1206 * accordingly.
1207 *
1208 * While it is technically possible to use this function on DT, it is only
1209 * meaningful on ACPI. On Device tree you can refer to any node in the tree but
1210 * on ACPI the references are limited to devices.
1211 *
1212 * Return: 0 on success
1213 * -ENOENT if no entries (or the property itself) were found
1214 * -EINVAL if property parsing otherwisefailed
1215 * -ENOMEM if memory allocation failed
1216 */
1217 static int
1218 v4l2_fwnode_reference_parse_int_props(struct device *dev,
1219 struct v4l2_async_notifier *notifier,
1220 const struct v4l2_fwnode_int_props *p)
1221 {
1222 struct fwnode_handle *fwnode;
1223 unsigned int index;
1224 int ret;
1225 const char *prop = p->name;
1226 const char * const *props = p->props;
1227 unsigned int nprops = p->nprops;
1228
1229 index = 0;
1230 do {
1231 fwnode = v4l2_fwnode_reference_get_int_prop(dev_fwnode(dev),
1232 prop, index,
1233 props, nprops);
1234 if (IS_ERR(fwnode)) {
1235 /*
1236 * Note that right now both -ENODATA and -ENOENT may
1237 * signal out-of-bounds access. Return the error in
1238 * cases other than that.
1239 */
1240 if (PTR_ERR(fwnode) != -ENOENT &&
1241 PTR_ERR(fwnode) != -ENODATA)
1242 return PTR_ERR(fwnode);
1243 break;
1244 }
1245 fwnode_handle_put(fwnode);
1246 index++;
1247 } while (1);
1248
1249 for (index = 0;
1250 !IS_ERR((fwnode = v4l2_fwnode_reference_get_int_prop(dev_fwnode(dev),
1251 prop, index,
1252 props,
1253 nprops)));
1254 index++) {
1255 struct v4l2_async_subdev *asd;
1256
1257 asd = v4l2_async_notifier_add_fwnode_subdev(notifier, fwnode,
1258 sizeof(*asd));
1259 fwnode_handle_put(fwnode);
1260 if (IS_ERR(asd)) {
1261 ret = PTR_ERR(asd);
1262 /* not an error if asd already exists */
1263 if (ret == -EEXIST)
1264 continue;
1265
1266 return PTR_ERR(asd);
1267 }
1268 }
1269
1270 return !fwnode || PTR_ERR(fwnode) == -ENOENT ? 0 : PTR_ERR(fwnode);
1271 }
1272
1273 int v4l2_async_notifier_parse_fwnode_sensor_common(struct device *dev,
1274 struct v4l2_async_notifier *notifier)
1275 {
1276 static const char * const led_props[] = { "led" };
1277 static const struct v4l2_fwnode_int_props props[] = {
1278 { "flash-leds", led_props, ARRAY_SIZE(led_props) },
1279 { "lens-focus", NULL, 0 },
1280 };
1281 unsigned int i;
1282
1283 for (i = 0; i < ARRAY_SIZE(props); i++) {
1284 int ret;
1285
1286 if (props[i].props && is_acpi_node(dev_fwnode(dev)))
1287 ret = v4l2_fwnode_reference_parse_int_props(dev,
1288 notifier,
1289 &props[i]);
1290 else
1291 ret = v4l2_fwnode_reference_parse(dev, notifier,
1292 props[i].name);
1293 if (ret && ret != -ENOENT) {
1294 dev_warn(dev, "parsing property \"%s\" failed (%d)\n",
1295 props[i].name, ret);
1296 return ret;
1297 }
1298 }
1299
1300 return 0;
1301 }
1302 EXPORT_SYMBOL_GPL(v4l2_async_notifier_parse_fwnode_sensor_common);
1303
1304 int v4l2_async_register_subdev_sensor_common(struct v4l2_subdev *sd)
1305 {
1306 struct v4l2_async_notifier *notifier;
1307 int ret;
1308
1309 if (WARN_ON(!sd->dev))
1310 return -ENODEV;
1311
1312 notifier = kzalloc(sizeof(*notifier), GFP_KERNEL);
1313 if (!notifier)
1314 return -ENOMEM;
1315
1316 v4l2_async_notifier_init(notifier);
1317
1318 ret = v4l2_async_notifier_parse_fwnode_sensor_common(sd->dev,
1319 notifier);
1320 if (ret < 0)
1321 goto out_cleanup;
1322
1323 ret = v4l2_async_subdev_notifier_register(sd, notifier);
1324 if (ret < 0)
1325 goto out_cleanup;
1326
1327 ret = v4l2_async_register_subdev(sd);
1328 if (ret < 0)
1329 goto out_unregister;
1330
1331 sd->subdev_notifier = notifier;
1332
1333 return 0;
1334
1335 out_unregister:
1336 v4l2_async_notifier_unregister(notifier);
1337
1338 out_cleanup:
1339 v4l2_async_notifier_cleanup(notifier);
1340 kfree(notifier);
1341
1342 return ret;
1343 }
1344 EXPORT_SYMBOL_GPL(v4l2_async_register_subdev_sensor_common);
1345
1346 MODULE_LICENSE("GPL");
1347 MODULE_AUTHOR("Sakari Ailus <sakari.ailus@linux.intel.com>");
1348 MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
1349 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
Linux with added FPC-III support