/*
   * V4L2 flash LED sub-device registration helpers.
   *
   *	Copyright (C) 2015 Samsung Electronics Co., Ltd
   *	Author: Jacek Anaszewski <j.anaszewski@samsung.com>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #ifndef _V4L2_FLASH_H
  #define _V4L2_FLASH_H
  
  #include <media/v4l2-ctrls.h>
  #include <media/v4l2-subdev.h>
  
  struct led_classdev_flash;
  struct led_classdev;
  struct v4l2_flash;
  enum led_brightness;

  /**

   * struct v4l2_flash_ctrl_data - flash control initialization data, filled
   *				basing on the features declared by the LED flash
   *				class driver in the v4l2_flash_config
   * @config:	initialization data for a control
   * @cid:	contains v4l2 flash control id if the config
   *		field was initialized, 0 otherwise
   */
  struct v4l2_flash_ctrl_data {
  	struct v4l2_ctrl_config config;
  	u32 cid;
  };

  /**
   * struct v4l2_flash_ops - V4L2 flash operations
   *
   * @external_strobe_set: Setup strobing the flash by hardware pin state
   *	assertion.
   * @intensity_to_led_brightness: Convert intensity to brightness in a device
   *	specific manner
   * @led_brightness_to_intensity: convert brightness to intensity in a device
   *	specific manner.
   */

  struct v4l2_flash_ops {

  	int (*external_strobe_set)(struct v4l2_flash *v4l2_flash,
  					bool enable);

  	enum led_brightness (*intensity_to_led_brightness)
  		(struct v4l2_flash *v4l2_flash, s32 intensity);

  	s32 (*led_brightness_to_intensity)
  		(struct v4l2_flash *v4l2_flash, enum led_brightness);
  };
  
  /**
   * struct v4l2_flash_config - V4L2 Flash sub-device initialization data
   * @dev_name:			the name of the media entity,

   *				unique in the system

   * @torch_intensity:		constraints for the LED in torch mode
   * @indicator_intensity:	constraints for the indicator LED
   * @flash_faults:		bitmask of flash faults that the LED flash class

   *				device can report; corresponding LED_FAULT* bit
   *				definitions are available in the header file
   *				<linux/led-class-flash.h>

   * @has_external_strobe:	external strobe capability
   */
  struct v4l2_flash_config {
  	char dev_name[32];
  	struct led_flash_setting torch_intensity;
  	struct led_flash_setting indicator_intensity;
  	u32 flash_faults;
  	unsigned int has_external_strobe:1;
  };
  
  /**
   * struct v4l2_flash - Flash sub-device context
   * @fled_cdev:		LED flash class device controlled by this sub-device
   * @iled_cdev:		LED class device representing indicator LED associated
   *			with the LED flash class device
   * @ops:		V4L2 specific flash ops
   * @sd:			V4L2 sub-device
   * @hdl:		flash controls handler
   * @ctrls:		array of pointers to controls, whose values define
   *			the sub-device state
   */
  struct v4l2_flash {
  	struct led_classdev_flash *fled_cdev;
  	struct led_classdev_flash *iled_cdev;
  	const struct v4l2_flash_ops *ops;
  
  	struct v4l2_subdev sd;
  	struct v4l2_ctrl_handler hdl;
  	struct v4l2_ctrl **ctrls;
  };
  
  static inline struct v4l2_flash *v4l2_subdev_to_v4l2_flash(
  							struct v4l2_subdev *sd)
  {
  	return container_of(sd, struct v4l2_flash, sd);
  }
  
  static inline struct v4l2_flash *v4l2_ctrl_to_v4l2_flash(struct v4l2_ctrl *c)
  {
  	return container_of(c->handler, struct v4l2_flash, hdl);
  }
  
  #if IS_ENABLED(CONFIG_V4L2_FLASH_LED_CLASS)
  /**
   * v4l2_flash_init - initialize V4L2 flash led sub-device
   * @dev:	flash device, e.g. an I2C device
   * @of_node:	of_node of the LED, may be NULL if the same as device's
   * @fled_cdev:	LED flash class device to wrap
   * @iled_cdev:	LED flash class device representing indicator LED associated
   *		with fled_cdev, may be NULL

   * @ops:	V4L2 Flash device ops

   * @config:	initialization data for V4L2 Flash sub-device
   *
   * Create V4L2 Flash sub-device wrapping given LED subsystem device.
   *
   * Returns: A valid pointer, or, when an error occurs, the return
   * value is encoded using ERR_PTR(). Use IS_ERR() to check and
   * PTR_ERR() to obtain the numeric return value.
   */
  struct v4l2_flash *v4l2_flash_init(
  	struct device *dev, struct device_node *of_node,
  	struct led_classdev_flash *fled_cdev,
  	struct led_classdev_flash *iled_cdev,
  	const struct v4l2_flash_ops *ops,
  	struct v4l2_flash_config *config);
  
  /**
   * v4l2_flash_release - release V4L2 Flash sub-device

   * @v4l2_flash: the V4L2 Flash sub-device to release

   *
   * Release V4L2 Flash sub-device.
   */
  void v4l2_flash_release(struct v4l2_flash *v4l2_flash);
  
  #else
  static inline struct v4l2_flash *v4l2_flash_init(
  	struct device *dev, struct device_node *of_node,
  	struct led_classdev_flash *fled_cdev,
  	struct led_classdev_flash *iled_cdev,
  	const struct v4l2_flash_ops *ops,
  	struct v4l2_flash_config *config)
  {
  	return NULL;
  }
  
  static inline void v4l2_flash_release(struct v4l2_flash *v4l2_flash)
  {
  }
  #endif /* CONFIG_V4L2_FLASH_LED_CLASS */
  
  #endif /* _V4L2_FLASH_H */