1 /* 2 * V4L2 fwnode binding parsing library 3 * 4 * Copyright (c) 2016 Intel Corporation. 5 * Author: Sakari Ailus <sakari.ailus@linux.intel.com> 6 * 7 * Copyright (C) 2012 - 2013 Samsung Electronics Co., Ltd. 8 * Author: Sylwester Nawrocki <s.nawrocki@samsung.com> 9 * 10 * Copyright (C) 2012 Renesas Electronics Corp. 11 * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de> 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of version 2 of the GNU General Public License as 15 * published by the Free Software Foundation. 16 */ 17 #ifndef _V4L2_FWNODE_H 18 #define _V4L2_FWNODE_H 19 20 #include <linux/errno.h> 21 #include <linux/fwnode.h> 22 #include <linux/list.h> 23 #include <linux/types.h> 24 25 #include <media/v4l2-mediabus.h> 26 #include <media/v4l2-subdev.h> 27 28 struct fwnode_handle; 29 struct v4l2_async_notifier; 30 struct v4l2_async_subdev; 31 32 #define V4L2_FWNODE_CSI2_MAX_DATA_LANES 4 33 34 /** 35 * struct v4l2_fwnode_bus_mipi_csi2 - MIPI CSI-2 bus data structure 36 * @flags: media bus (V4L2_MBUS_*) flags 37 * @data_lanes: an array of physical data lane indexes 38 * @clock_lane: physical lane index of the clock lane 39 * @num_data_lanes: number of data lanes 40 * @lane_polarities: polarity of the lanes. The order is the same of 41 * the physical lanes. 42 */ 43 struct v4l2_fwnode_bus_mipi_csi2 { 44 unsigned int flags; 45 unsigned char data_lanes[V4L2_FWNODE_CSI2_MAX_DATA_LANES]; 46 unsigned char clock_lane; 47 unsigned short num_data_lanes; 48 bool lane_polarities[1 + V4L2_FWNODE_CSI2_MAX_DATA_LANES]; 49 }; 50 51 /** 52 * struct v4l2_fwnode_bus_parallel - parallel data bus data structure 53 * @flags: media bus (V4L2_MBUS_*) flags 54 * @bus_width: bus width in bits 55 * @data_shift: data shift in bits 56 */ 57 struct v4l2_fwnode_bus_parallel { 58 unsigned int flags; 59 unsigned char bus_width; 60 unsigned char data_shift; 61 }; 62 63 /** 64 * struct v4l2_fwnode_bus_mipi_csi1 - CSI-1/CCP2 data bus structure 65 * @clock_inv: polarity of clock/strobe signal 66 * false - not inverted, true - inverted 67 * @strobe: false - data/clock, true - data/strobe 68 * @lane_polarity: the polarities of the clock (index 0) and data lanes 69 * index (1) 70 * @data_lane: the number of the data lane 71 * @clock_lane: the number of the clock lane 72 */ 73 struct v4l2_fwnode_bus_mipi_csi1 { 74 unsigned char clock_inv:1; 75 unsigned char strobe:1; 76 bool lane_polarity[2]; 77 unsigned char data_lane; 78 unsigned char clock_lane; 79 }; 80 81 /** 82 * struct v4l2_fwnode_endpoint - the endpoint data structure 83 * @base: fwnode endpoint of the v4l2_fwnode 84 * @bus_type: bus type 85 * @bus: union with bus configuration data structure 86 * @bus.parallel: embedded &struct v4l2_fwnode_bus_parallel. 87 * Used if the bus is parallel. 88 * @bus.mipi_csi1: embedded &struct v4l2_fwnode_bus_mipi_csi1. 89 * Used if the bus is MIPI Alliance's Camera Serial 90 * Interface version 1 (MIPI CSI1) or Standard 91 * Mobile Imaging Architecture's Compact Camera Port 2 92 * (SMIA CCP2). 93 * @bus.mipi_csi2: embedded &struct v4l2_fwnode_bus_mipi_csi2. 94 * Used if the bus is MIPI Alliance's Camera Serial 95 * Interface version 2 (MIPI CSI2). 96 * @link_frequencies: array of supported link frequencies 97 * @nr_of_link_frequencies: number of elements in link_frequenccies array 98 */ 99 struct v4l2_fwnode_endpoint { 100 struct fwnode_endpoint base; 101 /* 102 * Fields below this line will be zeroed by 103 * v4l2_fwnode_endpoint_parse() 104 */ 105 enum v4l2_mbus_type bus_type; 106 union { 107 struct v4l2_fwnode_bus_parallel parallel; 108 struct v4l2_fwnode_bus_mipi_csi1 mipi_csi1; 109 struct v4l2_fwnode_bus_mipi_csi2 mipi_csi2; 110 } bus; 111 u64 *link_frequencies; 112 unsigned int nr_of_link_frequencies; 113 }; 114 115 /** 116 * struct v4l2_fwnode_link - a link between two endpoints 117 * @local_node: pointer to device_node of this endpoint 118 * @local_port: identifier of the port this endpoint belongs to 119 * @remote_node: pointer to device_node of the remote endpoint 120 * @remote_port: identifier of the port the remote endpoint belongs to 121 */ 122 struct v4l2_fwnode_link { 123 struct fwnode_handle *local_node; 124 unsigned int local_port; 125 struct fwnode_handle *remote_node; 126 unsigned int remote_port; 127 }; 128 129 /** 130 * v4l2_fwnode_endpoint_parse() - parse all fwnode node properties 131 * @fwnode: pointer to the endpoint's fwnode handle 132 * @vep: pointer to the V4L2 fwnode data structure 133 * 134 * This function parses the V4L2 fwnode endpoint specific parameters from the 135 * firmware. The caller is responsible for assigning @vep.bus_type to a valid 136 * media bus type. The caller may also set the default configuration for the 137 * endpoint --- a configuration that shall be in line with the DT binding 138 * documentation. Should a device support multiple bus types, the caller may 139 * call this function once the correct type is found --- with a default 140 * configuration valid for that type. 141 * 142 * As a compatibility means guessing the bus type is also supported by setting 143 * @vep.bus_type to V4L2_MBUS_UNKNOWN. The caller may not provide a default 144 * configuration in this case as the defaults are specific to a given bus type. 145 * This functionality is deprecated and should not be used in new drivers and it 146 * is only supported for CSI-2 D-PHY, parallel and Bt.656 buses. 147 * 148 * The function does not change the V4L2 fwnode endpoint state if it fails. 149 * 150 * NOTE: This function does not parse properties the size of which is variable 151 * without a low fixed limit. Please use v4l2_fwnode_endpoint_alloc_parse() in 152 * new drivers instead. 153 * 154 * Return: %0 on success or a negative error code on failure: 155 * %-ENOMEM on memory allocation failure 156 * %-EINVAL on parsing failure 157 * %-ENXIO on mismatching bus types 158 */ 159 int v4l2_fwnode_endpoint_parse(struct fwnode_handle *fwnode, 160 struct v4l2_fwnode_endpoint *vep); 161 162 /** 163 * v4l2_fwnode_endpoint_free() - free the V4L2 fwnode acquired by 164 * v4l2_fwnode_endpoint_alloc_parse() 165 * @vep: the V4L2 fwnode the resources of which are to be released 166 * 167 * It is safe to call this function with NULL argument or on a V4L2 fwnode the 168 * parsing of which failed. 169 */ 170 void v4l2_fwnode_endpoint_free(struct v4l2_fwnode_endpoint *vep); 171 172 /** 173 * v4l2_fwnode_endpoint_alloc_parse() - parse all fwnode node properties 174 * @fwnode: pointer to the endpoint's fwnode handle 175 * @vep: pointer to the V4L2 fwnode data structure 176 * 177 * This function parses the V4L2 fwnode endpoint specific parameters from the 178 * firmware. The caller is responsible for assigning @vep.bus_type to a valid 179 * media bus type. The caller may also set the default configuration for the 180 * endpoint --- a configuration that shall be in line with the DT binding 181 * documentation. Should a device support multiple bus types, the caller may 182 * call this function once the correct type is found --- with a default 183 * configuration valid for that type. 184 * 185 * As a compatibility means guessing the bus type is also supported by setting 186 * @vep.bus_type to V4L2_MBUS_UNKNOWN. The caller may not provide a default 187 * configuration in this case as the defaults are specific to a given bus type. 188 * This functionality is deprecated and should not be used in new drivers and it 189 * is only supported for CSI-2 D-PHY, parallel and Bt.656 buses. 190 * 191 * The function does not change the V4L2 fwnode endpoint state if it fails. 192 * 193 * v4l2_fwnode_endpoint_alloc_parse() has two important differences to 194 * v4l2_fwnode_endpoint_parse(): 195 * 196 * 1. It also parses variable size data. 197 * 198 * 2. The memory it has allocated to store the variable size data must be freed 199 * using v4l2_fwnode_endpoint_free() when no longer needed. 200 * 201 * Return: %0 on success or a negative error code on failure: 202 * %-ENOMEM on memory allocation failure 203 * %-EINVAL on parsing failure 204 * %-ENXIO on mismatching bus types 205 */ 206 int v4l2_fwnode_endpoint_alloc_parse(struct fwnode_handle *fwnode, 207 struct v4l2_fwnode_endpoint *vep); 208 209 /** 210 * v4l2_fwnode_parse_link() - parse a link between two endpoints 211 * @fwnode: pointer to the endpoint's fwnode at the local end of the link 212 * @link: pointer to the V4L2 fwnode link data structure 213 * 214 * Fill the link structure with the local and remote nodes and port numbers. 215 * The local_node and remote_node fields are set to point to the local and 216 * remote port's parent nodes respectively (the port parent node being the 217 * parent node of the port node if that node isn't a 'ports' node, or the 218 * grand-parent node of the port node otherwise). 219 * 220 * A reference is taken to both the local and remote nodes, the caller must use 221 * v4l2_fwnode_put_link() to drop the references when done with the 222 * link. 223 * 224 * Return: 0 on success, or -ENOLINK if the remote endpoint fwnode can't be 225 * found. 226 */ 227 int v4l2_fwnode_parse_link(struct fwnode_handle *fwnode, 228 struct v4l2_fwnode_link *link); 229 230 /** 231 * v4l2_fwnode_put_link() - drop references to nodes in a link 232 * @link: pointer to the V4L2 fwnode link data structure 233 * 234 * Drop references to the local and remote nodes in the link. This function 235 * must be called on every link parsed with v4l2_fwnode_parse_link(). 236 */ 237 void v4l2_fwnode_put_link(struct v4l2_fwnode_link *link); 238 239 /** 240 * typedef parse_endpoint_func - Driver's callback function to be called on 241 * each V4L2 fwnode endpoint. 242 * 243 * @dev: pointer to &struct device 244 * @vep: pointer to &struct v4l2_fwnode_endpoint 245 * @asd: pointer to &struct v4l2_async_subdev 246 * 247 * Return: 248 * * %0 on success 249 * * %-ENOTCONN if the endpoint is to be skipped but this 250 * should not be considered as an error 251 * * %-EINVAL if the endpoint configuration is invalid 252 */ 253 typedef int (*parse_endpoint_func)(struct device *dev, 254 struct v4l2_fwnode_endpoint *vep, 255 struct v4l2_async_subdev *asd); 256 257 /** 258 * v4l2_async_notifier_parse_fwnode_endpoints - Parse V4L2 fwnode endpoints in a 259 * device node 260 * @dev: the device the endpoints of which are to be parsed 261 * @notifier: notifier for @dev 262 * @asd_struct_size: size of the driver's async sub-device struct, including 263 * sizeof(struct v4l2_async_subdev). The &struct 264 * v4l2_async_subdev shall be the first member of 265 * the driver's async sub-device struct, i.e. both 266 * begin at the same memory address. 267 * @parse_endpoint: Driver's callback function called on each V4L2 fwnode 268 * endpoint. Optional. 269 * 270 * Parse the fwnode endpoints of the @dev device and populate the async sub- 271 * devices list in the notifier. The @parse_endpoint callback function is 272 * called for each endpoint with the corresponding async sub-device pointer to 273 * let the caller initialize the driver-specific part of the async sub-device 274 * structure. 275 * 276 * The notifier memory shall be zeroed before this function is called on the 277 * notifier. 278 * 279 * This function may not be called on a registered notifier and may be called on 280 * a notifier only once. 281 * 282 * The &struct v4l2_fwnode_endpoint passed to the callback function 283 * @parse_endpoint is released once the function is finished. If there is a need 284 * to retain that configuration, the user needs to allocate memory for it. 285 * 286 * Any notifier populated using this function must be released with a call to 287 * v4l2_async_notifier_cleanup() after it has been unregistered and the async 288 * sub-devices are no longer in use, even if the function returned an error. 289 * 290 * Return: %0 on success, including when no async sub-devices are found 291 * %-ENOMEM if memory allocation failed 292 * %-EINVAL if graph or endpoint parsing failed 293 * Other error codes as returned by @parse_endpoint 294 */ 295 int 296 v4l2_async_notifier_parse_fwnode_endpoints(struct device *dev, 297 struct v4l2_async_notifier *notifier, 298 size_t asd_struct_size, 299 parse_endpoint_func parse_endpoint); 300 301 /** 302 * v4l2_async_notifier_parse_fwnode_endpoints_by_port - Parse V4L2 fwnode 303 * endpoints of a port in a 304 * device node 305 * @dev: the device the endpoints of which are to be parsed 306 * @notifier: notifier for @dev 307 * @asd_struct_size: size of the driver's async sub-device struct, including 308 * sizeof(struct v4l2_async_subdev). The &struct 309 * v4l2_async_subdev shall be the first member of 310 * the driver's async sub-device struct, i.e. both 311 * begin at the same memory address. 312 * @port: port number where endpoints are to be parsed 313 * @parse_endpoint: Driver's callback function called on each V4L2 fwnode 314 * endpoint. Optional. 315 * 316 * This function is just like v4l2_async_notifier_parse_fwnode_endpoints() with 317 * the exception that it only parses endpoints in a given port. This is useful 318 * on devices that have both sinks and sources: the async sub-devices connected 319 * to sources have already been configured by another driver (on capture 320 * devices). In this case the driver must know which ports to parse. 321 * 322 * Parse the fwnode endpoints of the @dev device on a given @port and populate 323 * the async sub-devices list of the notifier. The @parse_endpoint callback 324 * function is called for each endpoint with the corresponding async sub-device 325 * pointer to let the caller initialize the driver-specific part of the async 326 * sub-device structure. 327 * 328 * The notifier memory shall be zeroed before this function is called on the 329 * notifier the first time. 330 * 331 * This function may not be called on a registered notifier and may be called on 332 * a notifier only once per port. 333 * 334 * The &struct v4l2_fwnode_endpoint passed to the callback function 335 * @parse_endpoint is released once the function is finished. If there is a need 336 * to retain that configuration, the user needs to allocate memory for it. 337 * 338 * Any notifier populated using this function must be released with a call to 339 * v4l2_async_notifier_cleanup() after it has been unregistered and the async 340 * sub-devices are no longer in use, even if the function returned an error. 341 * 342 * Return: %0 on success, including when no async sub-devices are found 343 * %-ENOMEM if memory allocation failed 344 * %-EINVAL if graph or endpoint parsing failed 345 * Other error codes as returned by @parse_endpoint 346 */ 347 int 348 v4l2_async_notifier_parse_fwnode_endpoints_by_port(struct device *dev, 349 struct v4l2_async_notifier *notifier, 350 size_t asd_struct_size, 351 unsigned int port, 352 parse_endpoint_func parse_endpoint); 353 354 /** 355 * v4l2_fwnode_reference_parse_sensor_common - parse common references on 356 * sensors for async sub-devices 357 * @dev: the device node the properties of which are parsed for references 358 * @notifier: the async notifier where the async subdevs will be added 359 * 360 * Parse common sensor properties for remote devices related to the 361 * sensor and set up async sub-devices for them. 362 * 363 * Any notifier populated using this function must be released with a call to 364 * v4l2_async_notifier_release() after it has been unregistered and the async 365 * sub-devices are no longer in use, even in the case the function returned an 366 * error. 367 * 368 * Return: 0 on success 369 * -ENOMEM if memory allocation failed 370 * -EINVAL if property parsing failed 371 */ 372 int v4l2_async_notifier_parse_fwnode_sensor_common(struct device *dev, 373 struct v4l2_async_notifier *notifier); 374 375 /** 376 * v4l2_async_register_fwnode_subdev - registers a sub-device to the 377 * asynchronous sub-device framework 378 * and parses fwnode endpoints 379 * 380 * @sd: pointer to struct &v4l2_subdev 381 * @asd_struct_size: size of the driver's async sub-device struct, including 382 * sizeof(struct v4l2_async_subdev). The &struct 383 * v4l2_async_subdev shall be the first member of 384 * the driver's async sub-device struct, i.e. both 385 * begin at the same memory address. 386 * @ports: array of port id's to parse for fwnode endpoints. If NULL, will 387 * parse all ports owned by the sub-device. 388 * @num_ports: number of ports in @ports array. Ignored if @ports is NULL. 389 * @parse_endpoint: Driver's callback function called on each V4L2 fwnode 390 * endpoint. Optional. 391 * 392 * This function is just like v4l2_async_register_subdev() with the 393 * exception that calling it will also allocate a notifier for the 394 * sub-device, parse the sub-device's firmware node endpoints using 395 * v4l2_async_notifier_parse_fwnode_endpoints() or 396 * v4l2_async_notifier_parse_fwnode_endpoints_by_port(), and 397 * registers the sub-device notifier. The sub-device is similarly 398 * unregistered by calling v4l2_async_unregister_subdev(). 399 * 400 * While registered, the subdev module is marked as in-use. 401 * 402 * An error is returned if the module is no longer loaded on any attempts 403 * to register it. 404 */ 405 int 406 v4l2_async_register_fwnode_subdev(struct v4l2_subdev *sd, 407 size_t asd_struct_size, 408 unsigned int *ports, 409 unsigned int num_ports, 410 parse_endpoint_func parse_endpoint); 411 412 #endif /* _V4L2_FWNODE_H */ 413