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Release 4.7 include/linux/led-class-flash.h

Directory: include/linux
/*
 * LED Flash class interface
 *
 * 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 __LINUX_FLASH_LEDS_H_INCLUDED

#define __LINUX_FLASH_LEDS_H_INCLUDED

#include <linux/leds.h>

struct device_node;
struct led_classdev_flash;

/*
 * Supported led fault bits - must be kept in synch
 * with V4L2_FLASH_FAULT bits.
 */

#define LED_FAULT_OVER_VOLTAGE		(1 << 0)

#define LED_FAULT_TIMEOUT		(1 << 1)

#define LED_FAULT_OVER_TEMPERATURE	(1 << 2)

#define LED_FAULT_SHORT_CIRCUIT		(1 << 3)

#define LED_FAULT_OVER_CURRENT		(1 << 4)

#define LED_FAULT_INDICATOR		(1 << 5)

#define LED_FAULT_UNDER_VOLTAGE		(1 << 6)

#define LED_FAULT_INPUT_VOLTAGE		(1 << 7)

#define LED_FAULT_LED_OVER_TEMPERATURE	(1 << 8)

#define LED_NUM_FLASH_FAULTS		9


#define LED_FLASH_SYSFS_GROUPS_SIZE	5


struct led_flash_ops {
	/* set flash brightness */
	
int (*flash_brightness_set)(struct led_classdev_flash *fled_cdev,
					u32 brightness);
	/* get flash brightness */
	
int (*flash_brightness_get)(struct led_classdev_flash *fled_cdev,
					u32 *brightness);
	/* set flash strobe state */
	
int (*strobe_set)(struct led_classdev_flash *fled_cdev, bool state);
	/* get flash strobe state */
	
int (*strobe_get)(struct led_classdev_flash *fled_cdev, bool *state);
	/* set flash timeout */
	
int (*timeout_set)(struct led_classdev_flash *fled_cdev, u32 timeout);
	/* get the flash LED fault */
	
int (*fault_get)(struct led_classdev_flash *fled_cdev, u32 *fault);
};

/*
 * Current value of a flash setting along
 * with its constraints.
 */

struct led_flash_setting {
	/* maximum allowed value */
	
u32 min;
	/* maximum allowed value */
	
u32 max;
	/* step value */
	
u32 step;
	/* current value */
	
u32 val;
};


struct led_classdev_flash {
	/* led class device */
	
struct led_classdev led_cdev;

	/* flash led specific ops */
	
const struct led_flash_ops *ops;

	/* flash brightness value in microamperes along with its constraints */
	
struct led_flash_setting brightness;

	/* flash timeout value in microseconds along with its constraints */
	
struct led_flash_setting timeout;

	/* LED Flash class sysfs groups */
	
const struct attribute_group *sysfs_groups[LED_FLASH_SYSFS_GROUPS_SIZE];
};


static inline struct led_classdev_flash *lcdev_to_flcdev( struct led_classdev *lcdev) { return container_of(lcdev, struct led_classdev_flash, led_cdev); }

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/** * led_classdev_flash_register - register a new object of led_classdev class * with support for flash LEDs * @parent: the flash LED to register * @fled_cdev: the led_classdev_flash structure for this device * * Returns: 0 on success or negative error value on failure */ extern int led_classdev_flash_register(struct device *parent, struct led_classdev_flash *fled_cdev); /** * led_classdev_flash_unregister - unregisters an object of led_classdev class * with support for flash LEDs * @fled_cdev: the flash LED to unregister * * Unregister a previously registered via led_classdev_flash_register object */ extern void led_classdev_flash_unregister(struct led_classdev_flash *fled_cdev); /** * led_set_flash_strobe - setup flash strobe * @fled_cdev: the flash LED to set strobe on * @state: 1 - strobe flash, 0 - stop flash strobe * * Strobe the flash LED. * * Returns: 0 on success or negative error value on failure */
static inline int led_set_flash_strobe(struct led_classdev_flash *fled_cdev, bool state) { return fled_cdev->ops->strobe_set(fled_cdev, state); }

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/** * led_get_flash_strobe - get flash strobe status * @fled_cdev: the flash LED to query * @state: 1 - flash is strobing, 0 - flash is off * * Check whether the flash is strobing at the moment. * * Returns: 0 on success or negative error value on failure */
static inline int led_get_flash_strobe(struct led_classdev_flash *fled_cdev, bool *state) { if (fled_cdev->ops->strobe_get) return fled_cdev->ops->strobe_get(fled_cdev, state); return -EINVAL; }

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/** * led_set_flash_brightness - set flash LED brightness * @fled_cdev: the flash LED to set * @brightness: the brightness to set it to * * Set a flash LED's brightness. * * Returns: 0 on success or negative error value on failure */ extern int led_set_flash_brightness(struct led_classdev_flash *fled_cdev, u32 brightness); /** * led_update_flash_brightness - update flash LED brightness * @fled_cdev: the flash LED to query * * Get a flash LED's current brightness and update led_flash->brightness * member with the obtained value. * * Returns: 0 on success or negative error value on failure */ extern int led_update_flash_brightness(struct led_classdev_flash *fled_cdev); /** * led_set_flash_timeout - set flash LED timeout * @fled_cdev: the flash LED to set * @timeout: the flash timeout to set it to * * Set the flash strobe duration. * * Returns: 0 on success or negative error value on failure */ extern int led_set_flash_timeout(struct led_classdev_flash *fled_cdev, u32 timeout); /** * led_get_flash_fault - get the flash LED fault * @fled_cdev: the flash LED to query * @fault: bitmask containing flash faults * * Get the flash LED fault. * * Returns: 0 on success or negative error value on failure */ extern int led_get_flash_fault(struct led_classdev_flash *fled_cdev, u32 *fault); #endif /* __LINUX_FLASH_LEDS_H_INCLUDED */

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Directory: include/linux
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