root/include/media/v4l2-fwnode.h

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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 
  25 struct fwnode_handle;
  26 struct v4l2_async_notifier;
  27 struct 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  */
  40 struct 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  */
  54 struct 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  */
  70 struct 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  */
  96 struct 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  */
 119 struct 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  */
 156 int 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  */
 167 void 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  */
 203 int 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  */
 224 int 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  */
 234 void 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  */
 250 typedef 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  */
 292 int
 293 v4l2_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  */
 344 int
 345 v4l2_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  */
 369 int 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  */
 402 int
 403 v4l2_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 */

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