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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#include <media/v4l2-subdev.h>
24
25struct fwnode_handle;
26struct v4l2_async_notifier;
27struct v4l2_async_subdev;
28
29#define V4L2_FWNODE_CSI2_MAX_DATA_LANES 4
30
31/**
32 * struct v4l2_fwnode_bus_mipi_csi2 - MIPI CSI-2 bus data structure
33 * @flags: media bus (V4L2_MBUS_*) flags
34 * @data_lanes: an array of physical data lane indexes
35 * @clock_lane: physical lane index of the clock lane
36 * @num_data_lanes: number of data lanes
37 * @lane_polarities: polarity of the lanes. The order is the same of
38 * the physical lanes.
39 */
40struct v4l2_fwnode_bus_mipi_csi2 {
41 unsigned int flags;
42 unsigned char data_lanes[V4L2_FWNODE_CSI2_MAX_DATA_LANES];
43 unsigned char clock_lane;
44 unsigned short num_data_lanes;
45 bool lane_polarities[1 + V4L2_FWNODE_CSI2_MAX_DATA_LANES];
46};
47
48/**
49 * struct v4l2_fwnode_bus_parallel - parallel data bus data structure
50 * @flags: media bus (V4L2_MBUS_*) flags
51 * @bus_width: bus width in bits
52 * @data_shift: data shift in bits
53 */
54struct v4l2_fwnode_bus_parallel {
55 unsigned int flags;
56 unsigned char bus_width;
57 unsigned char data_shift;
58};
59
60/**
61 * struct v4l2_fwnode_bus_mipi_csi1 - CSI-1/CCP2 data bus structure
62 * @clock_inv: polarity of clock/strobe signal
63 * false - not inverted, true - inverted
64 * @strobe: false - data/clock, true - data/strobe
65 * @lane_polarity: the polarities of the clock (index 0) and data lanes
66 * index (1)
67 * @data_lane: the number of the data lane
68 * @clock_lane: the number of the clock lane
69 */
70struct v4l2_fwnode_bus_mipi_csi1 {
71 unsigned char clock_inv:1;
72 unsigned char strobe:1;
73 bool lane_polarity[2];
74 unsigned char data_lane;
75 unsigned char clock_lane;
76};
77
78/**
79 * struct v4l2_fwnode_endpoint - the endpoint data structure
80 * @base: fwnode endpoint of the v4l2_fwnode
81 * @bus_type: bus type
82 * @bus: union with bus configuration data structure
83 * @bus.parallel: embedded &struct v4l2_fwnode_bus_parallel.
84 * Used if the bus is parallel.
85 * @bus.mipi_csi1: embedded &struct v4l2_fwnode_bus_mipi_csi1.
86 * Used if the bus is MIPI Alliance's Camera Serial
87 * Interface version 1 (MIPI CSI1) or Standard
88 * Mobile Imaging Architecture's Compact Camera Port 2
89 * (SMIA CCP2).
90 * @bus.mipi_csi2: embedded &struct v4l2_fwnode_bus_mipi_csi2.
91 * Used if the bus is MIPI Alliance's Camera Serial
92 * Interface version 2 (MIPI CSI2).
93 * @link_frequencies: array of supported link frequencies
94 * @nr_of_link_frequencies: number of elements in link_frequenccies array
95 */
96struct v4l2_fwnode_endpoint {
97 struct fwnode_endpoint base;
98 /*
99 * Fields below this line will be zeroed by
100 * v4l2_fwnode_endpoint_parse()
101 */
102 enum v4l2_mbus_type bus_type;
103 union {
104 struct v4l2_fwnode_bus_parallel parallel;
105 struct v4l2_fwnode_bus_mipi_csi1 mipi_csi1;
106 struct v4l2_fwnode_bus_mipi_csi2 mipi_csi2;
107 } bus;
108 u64 *link_frequencies;
109 unsigned int nr_of_link_frequencies;
110};
111
112/**
113 * struct v4l2_fwnode_link - a link between two endpoints
114 * @local_node: pointer to device_node of this endpoint
115 * @local_port: identifier of the port this endpoint belongs to
116 * @remote_node: pointer to device_node of the remote endpoint
117 * @remote_port: identifier of the port the remote endpoint belongs to
118 */
119struct v4l2_fwnode_link {
120 struct fwnode_handle *local_node;
121 unsigned int local_port;
122 struct fwnode_handle *remote_node;
123 unsigned int remote_port;
124};
125
126/**
127 * v4l2_fwnode_endpoint_parse() - parse all fwnode node properties
128 * @fwnode: pointer to the endpoint's fwnode handle
129 * @vep: pointer to the V4L2 fwnode data structure
130 *
131 * This function parses the V4L2 fwnode endpoint specific parameters from the
132 * firmware. The caller is responsible for assigning @vep.bus_type to a valid
133 * media bus type. The caller may also set the default configuration for the
134 * endpoint --- a configuration that shall be in line with the DT binding
135 * documentation. Should a device support multiple bus types, the caller may
136 * call this function once the correct type is found --- with a default
137 * configuration valid for that type.
138 *
139 * As a compatibility means guessing the bus type is also supported by setting
140 * @vep.bus_type to V4L2_MBUS_UNKNOWN. The caller may not provide a default
141 * configuration in this case as the defaults are specific to a given bus type.
142 * This functionality is deprecated and should not be used in new drivers and it
143 * is only supported for CSI-2 D-PHY, parallel and Bt.656 buses.
144 *
145 * The function does not change the V4L2 fwnode endpoint state if it fails.
146 *
147 * NOTE: This function does not parse properties the size of which is variable
148 * without a low fixed limit. Please use v4l2_fwnode_endpoint_alloc_parse() in
149 * new drivers instead.
150 *
151 * Return: %0 on success or a negative error code on failure:
152 * %-ENOMEM on memory allocation failure
153 * %-EINVAL on parsing failure
154 * %-ENXIO on mismatching bus types
155 */
156int v4l2_fwnode_endpoint_parse(struct fwnode_handle *fwnode,
157 struct v4l2_fwnode_endpoint *vep);
158
159/**
160 * v4l2_fwnode_endpoint_free() - free the V4L2 fwnode acquired by
161 * v4l2_fwnode_endpoint_alloc_parse()
162 * @vep: the V4L2 fwnode the resources of which are to be released
163 *
164 * It is safe to call this function with NULL argument or on a V4L2 fwnode the
165 * parsing of which failed.
166 */
167void v4l2_fwnode_endpoint_free(struct v4l2_fwnode_endpoint *vep);
168
169/**
170 * v4l2_fwnode_endpoint_alloc_parse() - parse all fwnode node properties
171 * @fwnode: pointer to the endpoint's fwnode handle
172 * @vep: pointer to the V4L2 fwnode data structure
173 *
174 * This function parses the V4L2 fwnode endpoint specific parameters from the
175 * firmware. The caller is responsible for assigning @vep.bus_type to a valid
176 * media bus type. The caller may also set the default configuration for the
177 * endpoint --- a configuration that shall be in line with the DT binding
178 * documentation. Should a device support multiple bus types, the caller may
179 * call this function once the correct type is found --- with a default
180 * configuration valid for that type.
181 *
182 * As a compatibility means guessing the bus type is also supported by setting
183 * @vep.bus_type to V4L2_MBUS_UNKNOWN. The caller may not provide a default
184 * configuration in this case as the defaults are specific to a given bus type.
185 * This functionality is deprecated and should not be used in new drivers and it
186 * is only supported for CSI-2 D-PHY, parallel and Bt.656 buses.
187 *
188 * The function does not change the V4L2 fwnode endpoint state if it fails.
189 *
190 * v4l2_fwnode_endpoint_alloc_parse() has two important differences to
191 * v4l2_fwnode_endpoint_parse():
192 *
193 * 1. It also parses variable size data.
194 *
195 * 2. The memory it has allocated to store the variable size data must be freed
196 * using v4l2_fwnode_endpoint_free() when no longer needed.
197 *
198 * Return: %0 on success or a negative error code on failure:
199 * %-ENOMEM on memory allocation failure
200 * %-EINVAL on parsing failure
201 * %-ENXIO on mismatching bus types
202 */
203int v4l2_fwnode_endpoint_alloc_parse(struct fwnode_handle *fwnode,
204 struct v4l2_fwnode_endpoint *vep);
205
206/**
207 * v4l2_fwnode_parse_link() - parse a link between two endpoints
208 * @fwnode: pointer to the endpoint's fwnode at the local end of the link
209 * @link: pointer to the V4L2 fwnode link data structure
210 *
211 * Fill the link structure with the local and remote nodes and port numbers.
212 * The local_node and remote_node fields are set to point to the local and
213 * remote port's parent nodes respectively (the port parent node being the
214 * parent node of the port node if that node isn't a 'ports' node, or the
215 * grand-parent node of the port node otherwise).
216 *
217 * A reference is taken to both the local and remote nodes, the caller must use
218 * v4l2_fwnode_put_link() to drop the references when done with the
219 * link.
220 *
221 * Return: 0 on success, or -ENOLINK if the remote endpoint fwnode can't be
222 * found.
223 */
224int v4l2_fwnode_parse_link(struct fwnode_handle *fwnode,
225 struct v4l2_fwnode_link *link);
226
227/**
228 * v4l2_fwnode_put_link() - drop references to nodes in a link
229 * @link: pointer to the V4L2 fwnode link data structure
230 *
231 * Drop references to the local and remote nodes in the link. This function
232 * must be called on every link parsed with v4l2_fwnode_parse_link().
233 */
234void v4l2_fwnode_put_link(struct v4l2_fwnode_link *link);
235
236/**
237 * typedef parse_endpoint_func - Driver's callback function to be called on
238 * each V4L2 fwnode endpoint.
239 *
240 * @dev: pointer to &struct device
241 * @vep: pointer to &struct v4l2_fwnode_endpoint
242 * @asd: pointer to &struct v4l2_async_subdev
243 *
244 * Return:
245 * * %0 on success
246 * * %-ENOTCONN if the endpoint is to be skipped but this
247 * should not be considered as an error
248 * * %-EINVAL if the endpoint configuration is invalid
249 */
250typedef int (*parse_endpoint_func)(struct device *dev,
251 struct v4l2_fwnode_endpoint *vep,
252 struct v4l2_async_subdev *asd);
253
254/**
255 * v4l2_async_notifier_parse_fwnode_endpoints - Parse V4L2 fwnode endpoints in a
256 * device node
257 * @dev: the device the endpoints of which are to be parsed
258 * @notifier: notifier for @dev
259 * @asd_struct_size: size of the driver's async sub-device struct, including
260 * sizeof(struct v4l2_async_subdev). The &struct
261 * v4l2_async_subdev shall be the first member of
262 * the driver's async sub-device struct, i.e. both
263 * begin at the same memory address.
264 * @parse_endpoint: Driver's callback function called on each V4L2 fwnode
265 * endpoint. Optional.
266 *
267 * Parse the fwnode endpoints of the @dev device and populate the async sub-
268 * devices list in the notifier. The @parse_endpoint callback function is
269 * called for each endpoint with the corresponding async sub-device pointer to
270 * let the caller initialize the driver-specific part of the async sub-device
271 * structure.
272 *
273 * The notifier memory shall be zeroed before this function is called on the
274 * notifier.
275 *
276 * This function may not be called on a registered notifier and may be called on
277 * a notifier only once.
278 *
279 * The &struct v4l2_fwnode_endpoint passed to the callback function
280 * @parse_endpoint is released once the function is finished. If there is a need
281 * to retain that configuration, the user needs to allocate memory for it.
282 *
283 * Any notifier populated using this function must be released with a call to
284 * v4l2_async_notifier_cleanup() after it has been unregistered and the async
285 * sub-devices are no longer in use, even if the function returned an error.
286 *
287 * Return: %0 on success, including when no async sub-devices are found
288 * %-ENOMEM if memory allocation failed
289 * %-EINVAL if graph or endpoint parsing failed
290 * Other error codes as returned by @parse_endpoint
291 */
292int
293v4l2_async_notifier_parse_fwnode_endpoints(struct device *dev,
294 struct v4l2_async_notifier *notifier,
295 size_t asd_struct_size,
296 parse_endpoint_func parse_endpoint);
297
298/**
299 * v4l2_async_notifier_parse_fwnode_endpoints_by_port - Parse V4L2 fwnode
300 * endpoints of a port in a
301 * device node
302 * @dev: the device the endpoints of which are to be parsed
303 * @notifier: notifier for @dev
304 * @asd_struct_size: size of the driver's async sub-device struct, including
305 * sizeof(struct v4l2_async_subdev). The &struct
306 * v4l2_async_subdev shall be the first member of
307 * the driver's async sub-device struct, i.e. both
308 * begin at the same memory address.
309 * @port: port number where endpoints are to be parsed
310 * @parse_endpoint: Driver's callback function called on each V4L2 fwnode
311 * endpoint. Optional.
312 *
313 * This function is just like v4l2_async_notifier_parse_fwnode_endpoints() with
314 * the exception that it only parses endpoints in a given port. This is useful
315 * on devices that have both sinks and sources: the async sub-devices connected
316 * to sources have already been configured by another driver (on capture
317 * devices). In this case the driver must know which ports to parse.
318 *
319 * Parse the fwnode endpoints of the @dev device on a given @port and populate
320 * the async sub-devices list of the notifier. The @parse_endpoint callback
321 * function is called for each endpoint with the corresponding async sub-device
322 * pointer to let the caller initialize the driver-specific part of the async
323 * sub-device structure.
324 *
325 * The notifier memory shall be zeroed before this function is called on the
326 * notifier the first time.
327 *
328 * This function may not be called on a registered notifier and may be called on
329 * a notifier only once per port.
330 *
331 * The &struct v4l2_fwnode_endpoint passed to the callback function
332 * @parse_endpoint is released once the function is finished. If there is a need
333 * to retain that configuration, the user needs to allocate memory for it.
334 *
335 * Any notifier populated using this function must be released with a call to
336 * v4l2_async_notifier_cleanup() after it has been unregistered and the async
337 * sub-devices are no longer in use, even if the function returned an error.
338 *
339 * Return: %0 on success, including when no async sub-devices are found
340 * %-ENOMEM if memory allocation failed
341 * %-EINVAL if graph or endpoint parsing failed
342 * Other error codes as returned by @parse_endpoint
343 */
344int
345v4l2_async_notifier_parse_fwnode_endpoints_by_port(struct device *dev,
346 struct v4l2_async_notifier *notifier,
347 size_t asd_struct_size,
348 unsigned int port,
349 parse_endpoint_func parse_endpoint);
350
351/**
352 * v4l2_fwnode_reference_parse_sensor_common - parse common references on
353 * sensors for async sub-devices
354 * @dev: the device node the properties of which are parsed for references
355 * @notifier: the async notifier where the async subdevs will be added
356 *
357 * Parse common sensor properties for remote devices related to the
358 * sensor and set up async sub-devices for them.
359 *
360 * Any notifier populated using this function must be released with a call to
361 * v4l2_async_notifier_release() after it has been unregistered and the async
362 * sub-devices are no longer in use, even in the case the function returned an
363 * error.
364 *
365 * Return: 0 on success
366 * -ENOMEM if memory allocation failed
367 * -EINVAL if property parsing failed
368 */
369int v4l2_async_notifier_parse_fwnode_sensor_common(struct device *dev,
370 struct v4l2_async_notifier *notifier);
371
372/**
373 * v4l2_async_register_fwnode_subdev - registers a sub-device to the
374 * asynchronous sub-device framework
375 * and parses fwnode endpoints
376 *
377 * @sd: pointer to struct &v4l2_subdev
378 * @asd_struct_size: size of the driver's async sub-device struct, including
379 * sizeof(struct v4l2_async_subdev). The &struct
380 * v4l2_async_subdev shall be the first member of
381 * the driver's async sub-device struct, i.e. both
382 * begin at the same memory address.
383 * @ports: array of port id's to parse for fwnode endpoints. If NULL, will
384 * parse all ports owned by the sub-device.
385 * @num_ports: number of ports in @ports array. Ignored if @ports is NULL.
386 * @parse_endpoint: Driver's callback function called on each V4L2 fwnode
387 * endpoint. Optional.
388 *
389 * This function is just like v4l2_async_register_subdev() with the
390 * exception that calling it will also allocate a notifier for the
391 * sub-device, parse the sub-device's firmware node endpoints using
392 * v4l2_async_notifier_parse_fwnode_endpoints() or
393 * v4l2_async_notifier_parse_fwnode_endpoints_by_port(), and
394 * registers the sub-device notifier. The sub-device is similarly
395 * unregistered by calling v4l2_async_unregister_subdev().
396 *
397 * While registered, the subdev module is marked as in-use.
398 *
399 * An error is returned if the module is no longer loaded on any attempts
400 * to register it.
401 */
402int
403v4l2_async_register_fwnode_subdev(struct v4l2_subdev *sd,
404 size_t asd_struct_size,
405 unsigned int *ports,
406 unsigned int num_ports,
407 parse_endpoint_func parse_endpoint);
408
409#endif /* _V4L2_FWNODE_H */