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186 lines
5.8 KiB
186 lines
5.8 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* V4L2 flash LED sub-device registration helpers. |
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* |
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* Copyright (C) 2015 Samsung Electronics Co., Ltd |
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* Author: Jacek Anaszewski <[email protected]> |
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*/ |
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#ifndef _V4L2_FLASH_H |
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#define _V4L2_FLASH_H |
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#include <media/v4l2-ctrls.h> |
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#include <media/v4l2-subdev.h> |
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struct led_classdev_flash; |
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struct led_classdev; |
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struct v4l2_flash; |
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enum led_brightness; |
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/** |
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* struct v4l2_flash_ctrl_data - flash control initialization data, filled |
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* basing on the features declared by the LED flash |
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* class driver in the v4l2_flash_config |
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* @config: initialization data for a control |
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* @cid: contains v4l2 flash control id if the config |
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* field was initialized, 0 otherwise |
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*/ |
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struct v4l2_flash_ctrl_data { |
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struct v4l2_ctrl_config config; |
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u32 cid; |
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}; |
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/** |
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* struct v4l2_flash_ops - V4L2 flash operations |
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* |
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* @external_strobe_set: Setup strobing the flash by hardware pin state |
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* assertion. |
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* @intensity_to_led_brightness: Convert intensity to brightness in a device |
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* specific manner |
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* @led_brightness_to_intensity: convert brightness to intensity in a device |
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* specific manner. |
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*/ |
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struct v4l2_flash_ops { |
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int (*external_strobe_set)(struct v4l2_flash *v4l2_flash, |
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bool enable); |
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enum led_brightness (*intensity_to_led_brightness) |
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(struct v4l2_flash *v4l2_flash, s32 intensity); |
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s32 (*led_brightness_to_intensity) |
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(struct v4l2_flash *v4l2_flash, enum led_brightness); |
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}; |
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/** |
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* struct v4l2_flash_config - V4L2 Flash sub-device initialization data |
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* @dev_name: the name of the media entity, |
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* unique in the system |
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* @intensity: non-flash strobe constraints for the LED |
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* @flash_faults: bitmask of flash faults that the LED flash class |
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* device can report; corresponding LED_FAULT* bit |
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* definitions are available in the header file |
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* <linux/led-class-flash.h> |
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* @has_external_strobe: external strobe capability |
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*/ |
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struct v4l2_flash_config { |
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char dev_name[32]; |
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struct led_flash_setting intensity; |
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u32 flash_faults; |
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unsigned int has_external_strobe:1; |
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}; |
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/** |
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* struct v4l2_flash - Flash sub-device context |
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* @fled_cdev: LED flash class device controlled by this sub-device |
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* @iled_cdev: LED class device representing indicator LED associated |
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* with the LED flash class device |
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* @ops: V4L2 specific flash ops |
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* @sd: V4L2 sub-device |
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* @hdl: flash controls handler |
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* @ctrls: array of pointers to controls, whose values define |
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* the sub-device state |
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*/ |
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struct v4l2_flash { |
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struct led_classdev_flash *fled_cdev; |
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struct led_classdev *iled_cdev; |
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const struct v4l2_flash_ops *ops; |
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struct v4l2_subdev sd; |
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struct v4l2_ctrl_handler hdl; |
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struct v4l2_ctrl **ctrls; |
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}; |
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/** |
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* v4l2_subdev_to_v4l2_flash - Returns a &struct v4l2_flash from the |
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* &struct v4l2_subdev embedded on it. |
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* |
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* @sd: pointer to &struct v4l2_subdev |
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*/ |
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static inline struct v4l2_flash *v4l2_subdev_to_v4l2_flash( |
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struct v4l2_subdev *sd) |
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{ |
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return container_of(sd, struct v4l2_flash, sd); |
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} |
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/** |
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* v4l2_ctrl_to_v4l2_flash - Returns a &struct v4l2_flash from the |
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* &struct v4l2_ctrl embedded on it. |
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* |
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* @c: pointer to &struct v4l2_ctrl |
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*/ |
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static inline struct v4l2_flash *v4l2_ctrl_to_v4l2_flash(struct v4l2_ctrl *c) |
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{ |
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return container_of(c->handler, struct v4l2_flash, hdl); |
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} |
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#if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS) |
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/** |
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* v4l2_flash_init - initialize V4L2 flash led sub-device |
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* @dev: flash device, e.g. an I2C device |
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* @fwn: fwnode_handle of the LED, may be NULL if the same as device's |
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* @fled_cdev: LED flash class device to wrap |
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* @ops: V4L2 Flash device ops |
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* @config: initialization data for V4L2 Flash sub-device |
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* |
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* Create V4L2 Flash sub-device wrapping given LED subsystem device. |
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* The ops pointer is stored by the V4L2 flash framework. No |
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* references are held to config nor its contents once this function |
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* has returned. |
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* |
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* Returns: A valid pointer, or, when an error occurs, the return |
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* value is encoded using ERR_PTR(). Use IS_ERR() to check and |
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* PTR_ERR() to obtain the numeric return value. |
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*/ |
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struct v4l2_flash *v4l2_flash_init( |
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struct device *dev, struct fwnode_handle *fwn, |
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struct led_classdev_flash *fled_cdev, |
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const struct v4l2_flash_ops *ops, struct v4l2_flash_config *config); |
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/** |
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* v4l2_flash_indicator_init - initialize V4L2 indicator sub-device |
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* @dev: flash device, e.g. an I2C device |
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* @fwn: fwnode_handle of the LED, may be NULL if the same as device's |
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* @iled_cdev: LED flash class device representing the indicator LED |
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* @config: initialization data for V4L2 Flash sub-device |
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* |
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* Create V4L2 Flash sub-device wrapping given LED subsystem device. |
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* The ops pointer is stored by the V4L2 flash framework. No |
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* references are held to config nor its contents once this function |
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* has returned. |
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* |
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* Returns: A valid pointer, or, when an error occurs, the return |
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* value is encoded using ERR_PTR(). Use IS_ERR() to check and |
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* PTR_ERR() to obtain the numeric return value. |
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*/ |
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struct v4l2_flash *v4l2_flash_indicator_init( |
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struct device *dev, struct fwnode_handle *fwn, |
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struct led_classdev *iled_cdev, struct v4l2_flash_config *config); |
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/** |
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* v4l2_flash_release - release V4L2 Flash sub-device |
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* @v4l2_flash: the V4L2 Flash sub-device to release |
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* |
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* Release V4L2 Flash sub-device. |
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*/ |
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void v4l2_flash_release(struct v4l2_flash *v4l2_flash); |
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#else |
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static inline struct v4l2_flash *v4l2_flash_init( |
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struct device *dev, struct fwnode_handle *fwn, |
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struct led_classdev_flash *fled_cdev, |
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const struct v4l2_flash_ops *ops, struct v4l2_flash_config *config) |
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{ |
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return NULL; |
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} |
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static inline struct v4l2_flash *v4l2_flash_indicator_init( |
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struct device *dev, struct fwnode_handle *fwn, |
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struct led_classdev *iled_cdev, struct v4l2_flash_config *config) |
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{ |
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return NULL; |
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} |
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static inline void v4l2_flash_release(struct v4l2_flash *v4l2_flash) |
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{ |
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} |
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#endif /* CONFIG_V4L2_FLASH_LED_CLASS */ |
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#endif /* _V4L2_FLASH_H */
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