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/*
* 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
* @intensity: non-flash strobe constraints for the 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 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 *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
* @fwn: fwnode_handle of the LED, may be NULL if the same as device's
* @fled_cdev: LED flash class device to wrap
* @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 fwnode_handle *fwn,
struct led_classdev_flash *fled_cdev,
const struct v4l2_flash_ops *ops, struct v4l2_flash_config *config);
/**
* v4l2_flash_indicator_init - initialize V4L2 indicator sub-device
* @dev: flash device, e.g. an I2C device
* @fwn: fwnode_handle of the LED, may be NULL if the same as device's
* @iled_cdev: LED flash class device representing the indicator LED
* @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_indicator_init(
struct device *dev, struct fwnode_handle *fwn,
struct led_classdev *iled_cdev, 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 fwnode_handle *fwn,
struct led_classdev_flash *fled_cdev,
const struct v4l2_flash_ops *ops, struct v4l2_flash_config *config)
{
return NULL;
}
static inline struct v4l2_flash *v4l2_flash_indicator_init(
struct device *dev, struct fwnode_handle *fwn,
struct led_classdev *iled_cdev, 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 */
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