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7aea8389a7
Some LED devices support two operation modes - torch and flash. This patch provides support for flash LED devices in the LED subsystem by introducing new sysfs attributes and kernel internal interface. The attributes being introduced are: flash_brightness, flash_strobe, flash_timeout, max_flash_timeout, max_flash_brightness, flash_fault, flash_sync_strobe and available_sync_leds. All the flash related features are placed in a separate module. The modifications aim to be compatible with V4L2 framework requirements related to the flash devices management. The design assumes that V4L2 sub-device can take of the LED class device control and communicate with it through the kernel internal interface. When V4L2 Flash sub-device file is opened, the LED class device sysfs interface is made unavailable. Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com> Acked-by: Kyungmin Park <kyungmin.park@samsung.com> Cc: Richard Purdie <rpurdie@rpsys.net> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Bryan Wu <cooloney@gmail.com>
208 lines
5.9 KiB
C
208 lines
5.9 KiB
C
/*
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* LED Flash class interface
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*
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* Copyright (C) 2015 Samsung Electronics Co., Ltd.
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* Author: Jacek Anaszewski <j.anaszewski@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#ifndef __LINUX_FLASH_LEDS_H_INCLUDED
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#define __LINUX_FLASH_LEDS_H_INCLUDED
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#include <linux/leds.h>
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#include <uapi/linux/v4l2-controls.h>
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struct device_node;
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struct led_classdev_flash;
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/*
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* Supported led fault bits - must be kept in synch
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* with V4L2_FLASH_FAULT bits.
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*/
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#define LED_FAULT_OVER_VOLTAGE (1 << 0)
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#define LED_FAULT_TIMEOUT (1 << 1)
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#define LED_FAULT_OVER_TEMPERATURE (1 << 2)
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#define LED_FAULT_SHORT_CIRCUIT (1 << 3)
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#define LED_FAULT_OVER_CURRENT (1 << 4)
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#define LED_FAULT_INDICATOR (1 << 5)
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#define LED_FAULT_UNDER_VOLTAGE (1 << 6)
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#define LED_FAULT_INPUT_VOLTAGE (1 << 7)
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#define LED_FAULT_LED_OVER_TEMPERATURE (1 << 8)
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#define LED_NUM_FLASH_FAULTS 9
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#define LED_FLASH_MAX_SYSFS_GROUPS 7
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struct led_flash_ops {
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/* set flash brightness */
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int (*flash_brightness_set)(struct led_classdev_flash *fled_cdev,
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u32 brightness);
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/* get flash brightness */
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int (*flash_brightness_get)(struct led_classdev_flash *fled_cdev,
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u32 *brightness);
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/* set flash strobe state */
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int (*strobe_set)(struct led_classdev_flash *fled_cdev, bool state);
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/* get flash strobe state */
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int (*strobe_get)(struct led_classdev_flash *fled_cdev, bool *state);
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/* set flash timeout */
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int (*timeout_set)(struct led_classdev_flash *fled_cdev, u32 timeout);
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/* get the flash LED fault */
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int (*fault_get)(struct led_classdev_flash *fled_cdev, u32 *fault);
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};
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/*
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* Current value of a flash setting along
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* with its constraints.
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*/
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struct led_flash_setting {
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/* maximum allowed value */
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u32 min;
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/* maximum allowed value */
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u32 max;
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/* step value */
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u32 step;
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/* current value */
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u32 val;
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};
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struct led_classdev_flash {
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/* led class device */
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struct led_classdev led_cdev;
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/* flash led specific ops */
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const struct led_flash_ops *ops;
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/* flash brightness value in microamperes along with its constraints */
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struct led_flash_setting brightness;
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/* flash timeout value in microseconds along with its constraints */
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struct led_flash_setting timeout;
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/* LED Flash class sysfs groups */
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const struct attribute_group *sysfs_groups[LED_FLASH_MAX_SYSFS_GROUPS];
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/* LEDs available for flash strobe synchronization */
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struct led_classdev_flash **sync_leds;
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/* Number of LEDs available for flash strobe synchronization */
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int num_sync_leds;
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/*
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* The identifier of the sub-led to synchronize the flash strobe with.
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* Identifiers start from 1, which reflects the first element from the
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* sync_leds array. 0 means that the flash strobe should not be
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* synchronized.
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*/
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u32 sync_led_id;
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};
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static inline struct led_classdev_flash *lcdev_to_flcdev(
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struct led_classdev *lcdev)
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{
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return container_of(lcdev, struct led_classdev_flash, led_cdev);
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}
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/**
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* led_classdev_flash_register - register a new object of led_classdev class
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* with support for flash LEDs
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* @parent: the flash LED to register
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* @fled_cdev: the led_classdev_flash structure for this device
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*
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* Returns: 0 on success or negative error value on failure
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*/
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extern int led_classdev_flash_register(struct device *parent,
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struct led_classdev_flash *fled_cdev);
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/**
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* led_classdev_flash_unregister - unregisters an object of led_classdev class
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* with support for flash LEDs
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* @fled_cdev: the flash LED to unregister
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*
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* Unregister a previously registered via led_classdev_flash_register object
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*/
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extern void led_classdev_flash_unregister(struct led_classdev_flash *fled_cdev);
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/**
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* led_set_flash_strobe - setup flash strobe
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* @fled_cdev: the flash LED to set strobe on
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* @state: 1 - strobe flash, 0 - stop flash strobe
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*
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* Strobe the flash LED.
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*
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* Returns: 0 on success or negative error value on failure
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*/
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static inline int led_set_flash_strobe(struct led_classdev_flash *fled_cdev,
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bool state)
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{
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return fled_cdev->ops->strobe_set(fled_cdev, state);
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}
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/**
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* led_get_flash_strobe - get flash strobe status
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* @fled_cdev: the flash LED to query
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* @state: 1 - flash is strobing, 0 - flash is off
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*
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* Check whether the flash is strobing at the moment.
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*
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* Returns: 0 on success or negative error value on failure
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*/
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static inline int led_get_flash_strobe(struct led_classdev_flash *fled_cdev,
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bool *state)
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{
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if (fled_cdev->ops->strobe_get)
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return fled_cdev->ops->strobe_get(fled_cdev, state);
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return -EINVAL;
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}
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/**
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* led_set_flash_brightness - set flash LED brightness
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* @fled_cdev: the flash LED to set
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* @brightness: the brightness to set it to
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*
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* Set a flash LED's brightness.
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*
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* Returns: 0 on success or negative error value on failure
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*/
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extern int led_set_flash_brightness(struct led_classdev_flash *fled_cdev,
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u32 brightness);
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/**
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* led_update_flash_brightness - update flash LED brightness
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* @fled_cdev: the flash LED to query
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*
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* Get a flash LED's current brightness and update led_flash->brightness
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* member with the obtained value.
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*
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* Returns: 0 on success or negative error value on failure
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*/
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extern int led_update_flash_brightness(struct led_classdev_flash *fled_cdev);
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/**
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* led_set_flash_timeout - set flash LED timeout
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* @fled_cdev: the flash LED to set
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* @timeout: the flash timeout to set it to
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*
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* Set the flash strobe duration.
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*
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* Returns: 0 on success or negative error value on failure
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*/
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extern int led_set_flash_timeout(struct led_classdev_flash *fled_cdev,
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u32 timeout);
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/**
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* led_get_flash_fault - get the flash LED fault
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* @fled_cdev: the flash LED to query
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* @fault: bitmask containing flash faults
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*
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* Get the flash LED fault.
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*
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* Returns: 0 on success or negative error value on failure
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*/
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extern int led_get_flash_fault(struct led_classdev_flash *fled_cdev,
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u32 *fault);
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#endif /* __LINUX_FLASH_LEDS_H_INCLUDED */
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