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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * V4L2 fwnode binding parsing library
4 *
5 * Copyright (c) 2016 Intel Corporation.
6 * Author: Sakari Ailus <sakari.ailus@linux.intel.com>
7 *
8 * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd.
9 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
10 *
11 * Copyright (C) 2012 Renesas Electronics Corp.
12 * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
13 */
14#ifndef _V4L2_FWNODE_H
15#define _V4L2_FWNODE_H
16
17#include <linux/errno.h>
18#include <linux/fwnode.h>
19#include <linux/list.h>
20#include <linux/types.h>
21
22#include <media/v4l2-mediabus.h>
23
24struct fwnode_handle;
25struct v4l2_async_notifier;
26struct v4l2_async_subdev;
27
28#define V4L2_FWNODE_CSI2_MAX_DATA_LANES 8
29
30/**
31 * struct v4l2_fwnode_bus_mipi_csi2 - MIPI CSI-2 bus data structure
32 * @flags: media bus (V4L2_MBUS_*) flags
33 * @data_lanes: an array of physical data lane indexes
34 * @clock_lane: physical lane index of the clock lane
35 * @num_data_lanes: number of data lanes
36 * @lane_polarities: polarity of the lanes. The order is the same of
37 * the physical lanes.
38 */
39struct v4l2_fwnode_bus_mipi_csi2 {
40 unsigned int flags;
41 unsigned char data_lanes[V4L2_FWNODE_CSI2_MAX_DATA_LANES];
42 unsigned char clock_lane;
43 unsigned char num_data_lanes;
44 bool lane_polarities[1 + V4L2_FWNODE_CSI2_MAX_DATA_LANES];
45};
46
47/**
48 * struct v4l2_fwnode_bus_parallel - parallel data bus data structure
49 * @flags: media bus (V4L2_MBUS_*) flags
50 * @bus_width: bus width in bits
51 * @data_shift: data shift in bits
52 */
53struct v4l2_fwnode_bus_parallel {
54 unsigned int flags;
55 unsigned char bus_width;
56 unsigned char data_shift;
57};
58
59/**
60 * struct v4l2_fwnode_bus_mipi_csi1 - CSI-1/CCP2 data bus structure
61 * @clock_inv: polarity of clock/strobe signal
62 * false - not inverted, true - inverted
63 * @strobe: false - data/clock, true - data/strobe
64 * @lane_polarity: the polarities of the clock (index 0) and data lanes
65 * index (1)
66 * @data_lane: the number of the data lane
67 * @clock_lane: the number of the clock lane
68 */
69struct v4l2_fwnode_bus_mipi_csi1 {
70 unsigned char clock_inv:1;
71 unsigned char strobe:1;
72 bool lane_polarity[2];
73 unsigned char data_lane;
74 unsigned char clock_lane;
75};
76
77/**
78 * struct v4l2_fwnode_endpoint - the endpoint data structure
79 * @base: fwnode endpoint of the v4l2_fwnode
80 * @bus_type: bus type
81 * @bus: bus configuration data structure
82 * @bus.parallel: embedded &struct v4l2_fwnode_bus_parallel.
83 * Used if the bus is parallel.
84 * @bus.mipi_csi1: embedded &struct v4l2_fwnode_bus_mipi_csi1.
85 * Used if the bus is MIPI Alliance's Camera Serial
86 * Interface version 1 (MIPI CSI1) or Standard
87 * Mobile Imaging Architecture's Compact Camera Port 2
88 * (SMIA CCP2).
89 * @bus.mipi_csi2: embedded &struct v4l2_fwnode_bus_mipi_csi2.
90 * Used if the bus is MIPI Alliance's Camera Serial
91 * Interface version 2 (MIPI CSI2).
92 * @link_frequencies: array of supported link frequencies
93 * @nr_of_link_frequencies: number of elements in link_frequenccies array
94 */
95struct v4l2_fwnode_endpoint {
96 struct fwnode_endpoint base;
97 /*
98 * Fields below this line will be zeroed by
99 * v4l2_fwnode_endpoint_parse()
100 */
101 enum v4l2_mbus_type bus_type;
102 struct {
103 struct v4l2_fwnode_bus_parallel parallel;
104 struct v4l2_fwnode_bus_mipi_csi1 mipi_csi1;
105 struct v4l2_fwnode_bus_mipi_csi2 mipi_csi2;
106 } bus;
107 u64 *link_frequencies;
108 unsigned int nr_of_link_frequencies;
109};
110
111/**
112 * V4L2_FWNODE_PROPERTY_UNSET - identify a non initialized property
113 *
114 * All properties in &struct v4l2_fwnode_device_properties are initialized
115 * to this value.
116 */
117#define V4L2_FWNODE_PROPERTY_UNSET (-1U)
118
119/**
120 * enum v4l2_fwnode_orientation - possible device orientation
121 * @V4L2_FWNODE_ORIENTATION_FRONT: device installed on the front side
122 * @V4L2_FWNODE_ORIENTATION_BACK: device installed on the back side
123 * @V4L2_FWNODE_ORIENTATION_EXTERNAL: device externally located
124 */
125enum v4l2_fwnode_orientation {
126 V4L2_FWNODE_ORIENTATION_FRONT,
127 V4L2_FWNODE_ORIENTATION_BACK,
128 V4L2_FWNODE_ORIENTATION_EXTERNAL
129};
130
131/**
132 * struct v4l2_fwnode_device_properties - fwnode device properties
133 * @orientation: device orientation. See &enum v4l2_fwnode_orientation
134 * @rotation: device rotation
135 */
136struct v4l2_fwnode_device_properties {
137 enum v4l2_fwnode_orientation orientation;
138 unsigned int rotation;
139};
140
141/**
142 * struct v4l2_fwnode_link - a link between two endpoints
143 * @local_node: pointer to device_node of this endpoint
144 * @local_port: identifier of the port this endpoint belongs to
145 * @local_id: identifier of the id this endpoint belongs to
146 * @remote_node: pointer to device_node of the remote endpoint
147 * @remote_port: identifier of the port the remote endpoint belongs to
148 * @remote_id: identifier of the id the remote endpoint belongs to
149 */
150struct v4l2_fwnode_link {
151 struct fwnode_handle *local_node;
152 unsigned int local_port;
153 unsigned int local_id;
154 struct fwnode_handle *remote_node;
155 unsigned int remote_port;
156 unsigned int remote_id;
157};
158
159/**
160 * enum v4l2_connector_type - connector type
161 * @V4L2_CONN_UNKNOWN: unknown connector type, no V4L2 connector configuration
162 * @V4L2_CONN_COMPOSITE: analog composite connector
163 * @V4L2_CONN_SVIDEO: analog svideo connector
164 */
165enum v4l2_connector_type {
166 V4L2_CONN_UNKNOWN,
167 V4L2_CONN_COMPOSITE,
168 V4L2_CONN_SVIDEO,
169};
170
171/**
172 * struct v4l2_connector_link - connector link data structure
173 * @head: structure to be used to add the link to the
174 * &struct v4l2_fwnode_connector
175 * @fwnode_link: &struct v4l2_fwnode_link link between the connector and the
176 * device the connector belongs to.
177 */
178struct v4l2_connector_link {
179 struct list_head head;
180 struct v4l2_fwnode_link fwnode_link;
181};
182
183/**
184 * struct v4l2_fwnode_connector_analog - analog connector data structure
185 * @sdtv_stds: sdtv standards this connector supports, set to V4L2_STD_ALL
186 * if no restrictions are specified.
187 */
188struct v4l2_fwnode_connector_analog {
189 v4l2_std_id sdtv_stds;
190};
191
192/**
193 * struct v4l2_fwnode_connector - the connector data structure
194 * @name: the connector device name
195 * @label: optional connector label
196 * @type: connector type
197 * @links: list of all connector &struct v4l2_connector_link links
198 * @nr_of_links: total number of links
199 * @connector: connector configuration
200 * @connector.analog: analog connector configuration
201 * &struct v4l2_fwnode_connector_analog
202 */
203struct v4l2_fwnode_connector {
204 const char *name;
205 const char *label;
206 enum v4l2_connector_type type;
207 struct list_head links;
208 unsigned int nr_of_links;
209
210 union {
211 struct v4l2_fwnode_connector_analog analog;
212 /* future connectors */
213 } connector;
214};
215
216/**
217 * enum v4l2_fwnode_bus_type - Video bus types defined by firmware properties
218 * @V4L2_FWNODE_BUS_TYPE_GUESS: Default value if no bus-type fwnode property
219 * @V4L2_FWNODE_BUS_TYPE_CSI2_CPHY: MIPI CSI-2 bus, C-PHY physical layer
220 * @V4L2_FWNODE_BUS_TYPE_CSI1: MIPI CSI-1 bus
221 * @V4L2_FWNODE_BUS_TYPE_CCP2: SMIA Compact Camera Port 2 bus
222 * @V4L2_FWNODE_BUS_TYPE_CSI2_DPHY: MIPI CSI-2 bus, D-PHY physical layer
223 * @V4L2_FWNODE_BUS_TYPE_PARALLEL: Camera Parallel Interface bus
224 * @V4L2_FWNODE_BUS_TYPE_BT656: BT.656 video format bus-type
225 * @NR_OF_V4L2_FWNODE_BUS_TYPE: Number of bus-types
226 */
227enum v4l2_fwnode_bus_type {
228 V4L2_FWNODE_BUS_TYPE_GUESS = 0,
229 V4L2_FWNODE_BUS_TYPE_CSI2_CPHY,
230 V4L2_FWNODE_BUS_TYPE_CSI1,
231 V4L2_FWNODE_BUS_TYPE_CCP2,
232 V4L2_FWNODE_BUS_TYPE_CSI2_DPHY,
233 V4L2_FWNODE_BUS_TYPE_PARALLEL,
234 V4L2_FWNODE_BUS_TYPE_BT656,
235 NR_OF_V4L2_FWNODE_BUS_TYPE
236};
237
238/**
239 * v4l2_fwnode_endpoint_parse() - parse all fwnode node properties
240 * @fwnode: pointer to the endpoint's fwnode handle
241 * @vep: pointer to the V4L2 fwnode data structure
242 *
243 * This function parses the V4L2 fwnode endpoint specific parameters from the
244 * firmware. There are two ways to use this function, either by letting it
245 * obtain the type of the bus (by setting the @vep.bus_type field to
246 * V4L2_MBUS_UNKNOWN) or specifying the bus type explicitly to one of the &enum
247 * v4l2_mbus_type types.
248 *
249 * When @vep.bus_type is V4L2_MBUS_UNKNOWN, the function will use the "bus-type"
250 * property to determine the type when it is available. The caller is
251 * responsible for validating the contents of @vep.bus_type field after the call
252 * returns.
253 *
254 * As a deprecated functionality to support older DT bindings without "bus-type"
255 * property for devices that support multiple types, if the "bus-type" property
256 * does not exist, the function will attempt to guess the type based on the
257 * endpoint properties available. NEVER RELY ON GUESSING THE BUS TYPE IN NEW
258 * DRIVERS OR BINDINGS.
259 *
260 * It is also possible to set @vep.bus_type corresponding to an actual bus. In
261 * this case the function will only attempt to parse properties related to this
262 * bus, and it will return an error if the value of the "bus-type" property
263 * corresponds to a different bus.
264 *
265 * The caller is required to initialise all fields of @vep, either with
266 * explicitly values, or by zeroing them.
267 *
268 * The function does not change the V4L2 fwnode endpoint state if it fails.
269 *
270 * NOTE: This function does not parse "link-frequencies" property as its size is
271 * not known in advance. Please use v4l2_fwnode_endpoint_alloc_parse() if you
272 * need properties of variable size.
273 *
274 * Return: %0 on success or a negative error code on failure:
275 * %-ENOMEM on memory allocation failure
276 * %-EINVAL on parsing failure
277 * %-ENXIO on mismatching bus types
278 */
279int v4l2_fwnode_endpoint_parse(struct fwnode_handle *fwnode,
280 struct v4l2_fwnode_endpoint *vep);
281
282/**
283 * v4l2_fwnode_endpoint_free() - free the V4L2 fwnode acquired by
284 * v4l2_fwnode_endpoint_alloc_parse()
285 * @vep: the V4L2 fwnode the resources of which are to be released
286 *
287 * It is safe to call this function with NULL argument or on a V4L2 fwnode the
288 * parsing of which failed.
289 */
290void v4l2_fwnode_endpoint_free(struct v4l2_fwnode_endpoint *vep);
291
292/**
293 * v4l2_fwnode_endpoint_alloc_parse() - parse all fwnode node properties
294 * @fwnode: pointer to the endpoint's fwnode handle
295 * @vep: pointer to the V4L2 fwnode data structure
296 *
297 * This function parses the V4L2 fwnode endpoint specific parameters from the
298 * firmware. There are two ways to use this function, either by letting it
299 * obtain the type of the bus (by setting the @vep.bus_type field to
300 * V4L2_MBUS_UNKNOWN) or specifying the bus type explicitly to one of the &enum
301 * v4l2_mbus_type types.
302 *
303 * When @vep.bus_type is V4L2_MBUS_UNKNOWN, the function will use the "bus-type"
304 * property to determine the type when it is available. The caller is
305 * responsible for validating the contents of @vep.bus_type field after the call
306 * returns.
307 *
308 * As a deprecated functionality to support older DT bindings without "bus-type"
309 * property for devices that support multiple types, if the "bus-type" property
310 * does not exist, the function will attempt to guess the type based on the
311 * endpoint properties available. NEVER RELY ON GUESSING THE BUS TYPE IN NEW
312 * DRIVERS OR BINDINGS.
313 *
314 * It is also possible to set @vep.bus_type corresponding to an actual bus. In
315 * this case the function will only attempt to parse properties related to this
316 * bus, and it will return an error if the value of the "bus-type" property
317 * corresponds to a different bus.
318 *
319 * The caller is required to initialise all fields of @vep, either with
320 * explicitly values, or by zeroing them.
321 *
322 * The function does not change the V4L2 fwnode endpoint state if it fails.
323 *
324 * v4l2_fwnode_endpoint_alloc_parse() has two important differences to
325 * v4l2_fwnode_endpoint_parse():
326 *
327 * 1. It also parses variable size data.
328 *
329 * 2. The memory it has allocated to store the variable size data must be freed
330 * using v4l2_fwnode_endpoint_free() when no longer needed.
331 *
332 * Return: %0 on success or a negative error code on failure:
333 * %-ENOMEM on memory allocation failure
334 * %-EINVAL on parsing failure
335 * %-ENXIO on mismatching bus types
336 */
337int v4l2_fwnode_endpoint_alloc_parse(struct fwnode_handle *fwnode,
338 struct v4l2_fwnode_endpoint *vep);
339
340/**
341 * v4l2_fwnode_parse_link() - parse a link between two endpoints
342 * @fwnode: pointer to the endpoint's fwnode at the local end of the link
343 * @link: pointer to the V4L2 fwnode link data structure
344 *
345 * Fill the link structure with the local and remote nodes and port numbers.
346 * The local_node and remote_node fields are set to point to the local and
347 * remote port's parent nodes respectively (the port parent node being the
348 * parent node of the port node if that node isn't a 'ports' node, or the
349 * grand-parent node of the port node otherwise).
350 *
351 * A reference is taken to both the local and remote nodes, the caller must use
352 * v4l2_fwnode_put_link() to drop the references when done with the
353 * link.
354 *
355 * Return: 0 on success, or -ENOLINK if the remote endpoint fwnode can't be
356 * found.
357 */
358int v4l2_fwnode_parse_link(struct fwnode_handle *fwnode,
359 struct v4l2_fwnode_link *link);
360
361/**
362 * v4l2_fwnode_put_link() - drop references to nodes in a link
363 * @link: pointer to the V4L2 fwnode link data structure
364 *
365 * Drop references to the local and remote nodes in the link. This function
366 * must be called on every link parsed with v4l2_fwnode_parse_link().
367 */
368void v4l2_fwnode_put_link(struct v4l2_fwnode_link *link);
369
370/**
371 * v4l2_fwnode_connector_free() - free the V4L2 connector acquired memory
372 * @connector: the V4L2 connector resources of which are to be released
373 *
374 * Free all allocated memory and put all links acquired by
375 * v4l2_fwnode_connector_parse() and v4l2_fwnode_connector_add_link().
376 *
377 * It is safe to call this function with NULL argument or on a V4L2 connector
378 * the parsing of which failed.
379 */
380void v4l2_fwnode_connector_free(struct v4l2_fwnode_connector *connector);
381
382/**
383 * v4l2_fwnode_connector_parse() - initialize the 'struct v4l2_fwnode_connector'
384 * @fwnode: pointer to the subdev endpoint's fwnode handle where the connector
385 * is connected to or to the connector endpoint fwnode handle.
386 * @connector: pointer to the V4L2 fwnode connector data structure
387 *
388 * Fill the &struct v4l2_fwnode_connector with the connector type, label and
389 * all &enum v4l2_connector_type specific connector data. The label is optional
390 * so it is set to %NULL if no one was found. The function initialize the links
391 * to zero. Adding links to the connector is done by calling
392 * v4l2_fwnode_connector_add_link().
393 *
394 * The memory allocated for the label must be freed when no longer needed.
395 * Freeing the memory is done by v4l2_fwnode_connector_free().
396 *
397 * Return:
398 * * %0 on success or a negative error code on failure:
399 * * %-EINVAL if @fwnode is invalid
400 * * %-ENOTCONN if connector type is unknown or connector device can't be found
401 */
402int v4l2_fwnode_connector_parse(struct fwnode_handle *fwnode,
403 struct v4l2_fwnode_connector *connector);
404
405/**
406 * v4l2_fwnode_connector_add_link - add a link between a connector node and
407 * a v4l2-subdev node.
408 * @fwnode: pointer to the subdev endpoint's fwnode handle where the connector
409 * is connected to
410 * @connector: pointer to the V4L2 fwnode connector data structure
411 *
412 * Add a new &struct v4l2_connector_link link to the
413 * &struct v4l2_fwnode_connector connector links list. The link local_node
414 * points to the connector node, the remote_node to the host v4l2 (sub)dev.
415 *
416 * The taken references to remote_node and local_node must be dropped and the
417 * allocated memory must be freed when no longer needed. Both is done by calling
418 * v4l2_fwnode_connector_free().
419 *
420 * Return:
421 * * %0 on success or a negative error code on failure:
422 * * %-EINVAL if @fwnode or @connector is invalid or @connector type is unknown
423 * * %-ENOMEM on link memory allocation failure
424 * * %-ENOTCONN if remote connector device can't be found
425 * * %-ENOLINK if link parsing between v4l2 (sub)dev and connector fails
426 */
427int v4l2_fwnode_connector_add_link(struct fwnode_handle *fwnode,
428 struct v4l2_fwnode_connector *connector);
429
430/**
431 * v4l2_fwnode_device_parse() - parse fwnode device properties
432 * @dev: pointer to &struct device
433 * @props: pointer to &struct v4l2_fwnode_device_properties where to store the
434 * parsed properties values
435 *
436 * This function parses and validates the V4L2 fwnode device properties from the
437 * firmware interface, and fills the @struct v4l2_fwnode_device_properties
438 * provided by the caller.
439 *
440 * Return:
441 * % 0 on success
442 * %-EINVAL if a parsed property value is not valid
443 */
444int v4l2_fwnode_device_parse(struct device *dev,
445 struct v4l2_fwnode_device_properties *props);
446
447/**
448 * typedef parse_endpoint_func - Driver's callback function to be called on
449 * each V4L2 fwnode endpoint.
450 *
451 * @dev: pointer to &struct device
452 * @vep: pointer to &struct v4l2_fwnode_endpoint
453 * @asd: pointer to &struct v4l2_async_subdev
454 *
455 * Return:
456 * * %0 on success
457 * * %-ENOTCONN if the endpoint is to be skipped but this
458 * should not be considered as an error
459 * * %-EINVAL if the endpoint configuration is invalid
460 */
461typedef int (*parse_endpoint_func)(struct device *dev,
462 struct v4l2_fwnode_endpoint *vep,
463 struct v4l2_async_subdev *asd);
464
465/**
466 * v4l2_async_notifier_parse_fwnode_endpoints - Parse V4L2 fwnode endpoints in a
467 * device node
468 * @dev: the device the endpoints of which are to be parsed
469 * @notifier: notifier for @dev
470 * @asd_struct_size: size of the driver's async sub-device struct, including
471 * sizeof(struct v4l2_async_subdev). The &struct
472 * v4l2_async_subdev shall be the first member of
473 * the driver's async sub-device struct, i.e. both
474 * begin at the same memory address.
475 * @parse_endpoint: Driver's callback function called on each V4L2 fwnode
476 * endpoint. Optional.
477 *
478 * DEPRECATED! This function is deprecated. Don't use it in new drivers.
479 * Instead see an example in cio2_parse_firmware() function in
480 * drivers/media/pci/intel/ipu3/ipu3-cio2.c .
481 *
482 * Parse the fwnode endpoints of the @dev device and populate the async sub-
483 * devices list in the notifier. The @parse_endpoint callback function is
484 * called for each endpoint with the corresponding async sub-device pointer to
485 * let the caller initialize the driver-specific part of the async sub-device
486 * structure.
487 *
488 * The notifier memory shall be zeroed before this function is called on the
489 * notifier.
490 *
491 * This function may not be called on a registered notifier and may be called on
492 * a notifier only once.
493 *
494 * The &struct v4l2_fwnode_endpoint passed to the callback function
495 * @parse_endpoint is released once the function is finished. If there is a need
496 * to retain that configuration, the user needs to allocate memory for it.
497 *
498 * Any notifier populated using this function must be released with a call to
499 * v4l2_async_notifier_cleanup() after it has been unregistered and the async
500 * sub-devices are no longer in use, even if the function returned an error.
501 *
502 * Return: %0 on success, including when no async sub-devices are found
503 * %-ENOMEM if memory allocation failed
504 * %-EINVAL if graph or endpoint parsing failed
505 * Other error codes as returned by @parse_endpoint
506 */
507int
508v4l2_async_notifier_parse_fwnode_endpoints(struct device *dev,
509 struct v4l2_async_notifier *notifier,
510 size_t asd_struct_size,
511 parse_endpoint_func parse_endpoint);
512
513/* Helper macros to access the connector links. */
514
515/** v4l2_connector_last_link - Helper macro to get the first
516 * &struct v4l2_fwnode_connector link
517 * @v4l2c: &struct v4l2_fwnode_connector owning the connector links
518 *
519 * This marco returns the first added &struct v4l2_connector_link connector
520 * link or @NULL if the connector has no links.
521 */
522#define v4l2_connector_first_link(v4l2c) \
523 list_first_entry_or_null(&(v4l2c)->links, \
524 struct v4l2_connector_link, head)
525
526/** v4l2_connector_last_link - Helper macro to get the last
527 * &struct v4l2_fwnode_connector link
528 * @v4l2c: &struct v4l2_fwnode_connector owning the connector links
529 *
530 * This marco returns the last &struct v4l2_connector_link added connector link.
531 */
532#define v4l2_connector_last_link(v4l2c) \
533 list_last_entry(&(v4l2c)->links, struct v4l2_connector_link, head)
534
535#endif /* _V4L2_FWNODE_H */