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![Jean-Jacques Hiblot](/assets/img/avatar_default.png)
If the LED is acquired by a consumer device with devm_led_get(), it is automatically released when the device is detached. Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Pavel Machek <pavel@ucw.cz>
593 lines
18 KiB
C
593 lines
18 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Driver model for leds and led triggers
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*
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* Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
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* Copyright (C) 2005 Richard Purdie <rpurdie@openedhand.com>
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*/
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#ifndef __LINUX_LEDS_H_INCLUDED
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#define __LINUX_LEDS_H_INCLUDED
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#include <dt-bindings/leds/common.h>
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#include <linux/device.h>
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#include <linux/kernfs.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/rwsem.h>
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#include <linux/spinlock.h>
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#include <linux/timer.h>
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#include <linux/workqueue.h>
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struct device;
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struct led_pattern;
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struct device_node;
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/*
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* LED Core
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*/
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enum led_brightness {
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LED_OFF = 0,
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LED_ON = 1,
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LED_HALF = 127,
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LED_FULL = 255,
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};
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struct led_init_data {
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/* device fwnode handle */
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struct fwnode_handle *fwnode;
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/*
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* default <color:function> tuple, for backward compatibility
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* with in-driver hard-coded LED names used as a fallback when
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* DT "label" property is absent; it should be set to NULL
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* in new LED class drivers.
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*/
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const char *default_label;
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/*
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* string to be used for devicename section of LED class device
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* either for label based LED name composition path or for fwnode
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* based when devname_mandatory is true
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*/
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const char *devicename;
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/*
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* indicates if LED name should always comprise devicename section;
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* only LEDs exposed by drivers of hot-pluggable devices should
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* set it to true
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*/
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bool devname_mandatory;
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};
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struct led_classdev {
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const char *name;
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enum led_brightness brightness;
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enum led_brightness max_brightness;
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int flags;
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/* Lower 16 bits reflect status */
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#define LED_SUSPENDED BIT(0)
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#define LED_UNREGISTERING BIT(1)
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/* Upper 16 bits reflect control information */
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#define LED_CORE_SUSPENDRESUME BIT(16)
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#define LED_SYSFS_DISABLE BIT(17)
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#define LED_DEV_CAP_FLASH BIT(18)
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#define LED_HW_PLUGGABLE BIT(19)
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#define LED_PANIC_INDICATOR BIT(20)
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#define LED_BRIGHT_HW_CHANGED BIT(21)
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#define LED_RETAIN_AT_SHUTDOWN BIT(22)
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#define LED_INIT_DEFAULT_TRIGGER BIT(23)
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/* set_brightness_work / blink_timer flags, atomic, private. */
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unsigned long work_flags;
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#define LED_BLINK_SW 0
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#define LED_BLINK_ONESHOT 1
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#define LED_BLINK_ONESHOT_STOP 2
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#define LED_BLINK_INVERT 3
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#define LED_BLINK_BRIGHTNESS_CHANGE 4
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#define LED_BLINK_DISABLE 5
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/* Set LED brightness level
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* Must not sleep. Use brightness_set_blocking for drivers
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* that can sleep while setting brightness.
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*/
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void (*brightness_set)(struct led_classdev *led_cdev,
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enum led_brightness brightness);
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/*
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* Set LED brightness level immediately - it can block the caller for
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* the time required for accessing a LED device register.
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*/
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int (*brightness_set_blocking)(struct led_classdev *led_cdev,
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enum led_brightness brightness);
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/* Get LED brightness level */
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enum led_brightness (*brightness_get)(struct led_classdev *led_cdev);
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/*
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* Activate hardware accelerated blink, delays are in milliseconds
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* and if both are zero then a sensible default should be chosen.
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* The call should adjust the timings in that case and if it can't
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* match the values specified exactly.
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* Deactivate blinking again when the brightness is set to LED_OFF
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* via the brightness_set() callback.
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*/
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int (*blink_set)(struct led_classdev *led_cdev,
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unsigned long *delay_on,
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unsigned long *delay_off);
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int (*pattern_set)(struct led_classdev *led_cdev,
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struct led_pattern *pattern, u32 len, int repeat);
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int (*pattern_clear)(struct led_classdev *led_cdev);
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struct device *dev;
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const struct attribute_group **groups;
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struct list_head node; /* LED Device list */
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const char *default_trigger; /* Trigger to use */
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unsigned long blink_delay_on, blink_delay_off;
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struct timer_list blink_timer;
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int blink_brightness;
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int new_blink_brightness;
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void (*flash_resume)(struct led_classdev *led_cdev);
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struct work_struct set_brightness_work;
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int delayed_set_value;
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#ifdef CONFIG_LEDS_TRIGGERS
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/* Protects the trigger data below */
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struct rw_semaphore trigger_lock;
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struct led_trigger *trigger;
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struct list_head trig_list;
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void *trigger_data;
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/* true if activated - deactivate routine uses it to do cleanup */
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bool activated;
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#endif
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#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
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int brightness_hw_changed;
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struct kernfs_node *brightness_hw_changed_kn;
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#endif
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/* Ensures consistent access to the LED Flash Class device */
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struct mutex led_access;
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};
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/**
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* led_classdev_register_ext - register a new object of LED class with
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* init data
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* @parent: LED controller device this LED is driven by
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* @led_cdev: the led_classdev structure for this device
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* @init_data: the LED class device initialization data
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*
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* Register a new object of LED class, with name derived from init_data.
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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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int led_classdev_register_ext(struct device *parent,
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struct led_classdev *led_cdev,
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struct led_init_data *init_data);
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/**
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* led_classdev_register - register a new object of LED class
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* @parent: LED controller device this LED is driven by
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* @led_cdev: the led_classdev structure for this device
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*
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* Register a new object of LED class, with name derived from the name property
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* of passed led_cdev argument.
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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_classdev_register(struct device *parent,
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struct led_classdev *led_cdev)
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{
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return led_classdev_register_ext(parent, led_cdev, NULL);
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}
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int devm_led_classdev_register_ext(struct device *parent,
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struct led_classdev *led_cdev,
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struct led_init_data *init_data);
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static inline int devm_led_classdev_register(struct device *parent,
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struct led_classdev *led_cdev)
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{
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return devm_led_classdev_register_ext(parent, led_cdev, NULL);
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}
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void led_classdev_unregister(struct led_classdev *led_cdev);
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void devm_led_classdev_unregister(struct device *parent,
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struct led_classdev *led_cdev);
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void led_classdev_suspend(struct led_classdev *led_cdev);
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void led_classdev_resume(struct led_classdev *led_cdev);
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extern struct led_classdev *of_led_get(struct device_node *np, int index);
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extern void led_put(struct led_classdev *led_cdev);
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struct led_classdev *__must_check devm_of_led_get(struct device *dev,
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int index);
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/**
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* led_blink_set - set blinking with software fallback
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* @led_cdev: the LED to start blinking
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* @delay_on: the time it should be on (in ms)
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* @delay_off: the time it should ble off (in ms)
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*
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* This function makes the LED blink, attempting to use the
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* hardware acceleration if possible, but falling back to
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* software blinking if there is no hardware blinking or if
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* the LED refuses the passed values.
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*
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* Note that if software blinking is active, simply calling
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* led_cdev->brightness_set() will not stop the blinking,
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* use led_classdev_brightness_set() instead.
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*/
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void led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on,
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unsigned long *delay_off);
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/**
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* led_blink_set_oneshot - do a oneshot software blink
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* @led_cdev: the LED to start blinking
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* @delay_on: the time it should be on (in ms)
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* @delay_off: the time it should ble off (in ms)
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* @invert: blink off, then on, leaving the led on
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*
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* This function makes the LED blink one time for delay_on +
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* delay_off time, ignoring the request if another one-shot
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* blink is already in progress.
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*
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* If invert is set, led blinks for delay_off first, then for
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* delay_on and leave the led on after the on-off cycle.
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*/
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void led_blink_set_oneshot(struct led_classdev *led_cdev,
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unsigned long *delay_on, unsigned long *delay_off,
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int invert);
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/**
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* led_set_brightness - set LED brightness
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* @led_cdev: the LED to set
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* @brightness: the brightness to set it to
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*
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* Set an LED's brightness, and, if necessary, cancel the
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* software blink timer that implements blinking when the
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* hardware doesn't. This function is guaranteed not to sleep.
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*/
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void led_set_brightness(struct led_classdev *led_cdev,
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enum led_brightness brightness);
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/**
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* led_set_brightness_sync - set LED brightness synchronously
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* @led_cdev: the LED to set
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* @value: the brightness to set it to
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*
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* Set an LED's brightness immediately. This function will block
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* the caller for the time required for accessing device registers,
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* and it can sleep.
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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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int led_set_brightness_sync(struct led_classdev *led_cdev,
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enum led_brightness value);
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/**
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* led_update_brightness - update LED brightness
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* @led_cdev: the LED to query
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*
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* Get an LED's current brightness and update led_cdev->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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int led_update_brightness(struct led_classdev *led_cdev);
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/**
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* led_get_default_pattern - return default pattern
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*
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* @led_cdev: the LED to get default pattern for
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* @size: pointer for storing the number of elements in returned array,
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* modified only if return != NULL
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*
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* Return: Allocated array of integers with default pattern from device tree
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* or NULL. Caller is responsible for kfree().
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*/
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u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size);
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/**
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* led_sysfs_disable - disable LED sysfs interface
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* @led_cdev: the LED to set
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*
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* Disable the led_cdev's sysfs interface.
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*/
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void led_sysfs_disable(struct led_classdev *led_cdev);
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/**
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* led_sysfs_enable - enable LED sysfs interface
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* @led_cdev: the LED to set
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*
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* Enable the led_cdev's sysfs interface.
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*/
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void led_sysfs_enable(struct led_classdev *led_cdev);
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/**
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* led_compose_name - compose LED class device name
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* @dev: LED controller device object
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* @init_data: the LED class device initialization data
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* @led_classdev_name: composed LED class device name
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*
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* Create LED class device name basing on the provided init_data argument.
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* The name can have <devicename:color:function> or <color:function>.
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* form, depending on the init_data configuration.
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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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int led_compose_name(struct device *dev, struct led_init_data *init_data,
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char *led_classdev_name);
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/**
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* led_sysfs_is_disabled - check if LED sysfs interface is disabled
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* @led_cdev: the LED to query
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*
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* Returns: true if the led_cdev's sysfs interface is disabled.
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*/
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static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev)
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{
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return led_cdev->flags & LED_SYSFS_DISABLE;
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}
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/*
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* LED Triggers
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*/
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/* Registration functions for simple triggers */
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#define DEFINE_LED_TRIGGER(x) static struct led_trigger *x;
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#define DEFINE_LED_TRIGGER_GLOBAL(x) struct led_trigger *x;
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#ifdef CONFIG_LEDS_TRIGGERS
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#define TRIG_NAME_MAX 50
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struct led_trigger {
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/* Trigger Properties */
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const char *name;
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int (*activate)(struct led_classdev *led_cdev);
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void (*deactivate)(struct led_classdev *led_cdev);
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/* LEDs under control by this trigger (for simple triggers) */
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rwlock_t leddev_list_lock;
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struct list_head led_cdevs;
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/* Link to next registered trigger */
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struct list_head next_trig;
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const struct attribute_group **groups;
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};
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/*
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* Currently the attributes in struct led_trigger::groups are added directly to
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* the LED device. As this might change in the future, the following
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* macros abstract getting the LED device and its trigger_data from the dev
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* parameter passed to the attribute accessor functions.
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*/
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#define led_trigger_get_led(dev) ((struct led_classdev *)dev_get_drvdata((dev)))
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#define led_trigger_get_drvdata(dev) (led_get_trigger_data(led_trigger_get_led(dev)))
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/* Registration functions for complex triggers */
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int led_trigger_register(struct led_trigger *trigger);
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void led_trigger_unregister(struct led_trigger *trigger);
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int devm_led_trigger_register(struct device *dev,
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struct led_trigger *trigger);
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void led_trigger_register_simple(const char *name,
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struct led_trigger **trigger);
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void led_trigger_unregister_simple(struct led_trigger *trigger);
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void led_trigger_event(struct led_trigger *trigger, enum led_brightness event);
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void led_trigger_blink(struct led_trigger *trigger, unsigned long *delay_on,
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unsigned long *delay_off);
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void led_trigger_blink_oneshot(struct led_trigger *trigger,
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unsigned long *delay_on,
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unsigned long *delay_off,
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int invert);
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void led_trigger_set_default(struct led_classdev *led_cdev);
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int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trigger);
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void led_trigger_remove(struct led_classdev *led_cdev);
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static inline void led_set_trigger_data(struct led_classdev *led_cdev,
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void *trigger_data)
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{
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led_cdev->trigger_data = trigger_data;
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}
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static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
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{
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return led_cdev->trigger_data;
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}
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/**
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* led_trigger_rename_static - rename a trigger
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* @name: the new trigger name
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* @trig: the LED trigger to rename
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*
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* Change a LED trigger name by copying the string passed in
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* name into current trigger name, which MUST be large
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* enough for the new string.
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*
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* Note that name must NOT point to the same string used
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* during LED registration, as that could lead to races.
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*
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* This is meant to be used on triggers with statically
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* allocated name.
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*/
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void led_trigger_rename_static(const char *name, struct led_trigger *trig);
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#define module_led_trigger(__led_trigger) \
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module_driver(__led_trigger, led_trigger_register, \
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led_trigger_unregister)
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#else
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/* Trigger has no members */
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struct led_trigger {};
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/* Trigger inline empty functions */
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static inline void led_trigger_register_simple(const char *name,
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struct led_trigger **trigger) {}
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static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {}
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static inline void led_trigger_event(struct led_trigger *trigger,
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enum led_brightness event) {}
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static inline void led_trigger_blink(struct led_trigger *trigger,
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unsigned long *delay_on,
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unsigned long *delay_off) {}
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static inline void led_trigger_blink_oneshot(struct led_trigger *trigger,
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unsigned long *delay_on,
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unsigned long *delay_off,
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int invert) {}
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static inline void led_trigger_set_default(struct led_classdev *led_cdev) {}
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static inline int led_trigger_set(struct led_classdev *led_cdev,
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struct led_trigger *trigger)
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{
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return 0;
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}
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static inline void led_trigger_remove(struct led_classdev *led_cdev) {}
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static inline void led_set_trigger_data(struct led_classdev *led_cdev) {}
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static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
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{
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return NULL;
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}
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#endif /* CONFIG_LEDS_TRIGGERS */
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/* Trigger specific functions */
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#ifdef CONFIG_LEDS_TRIGGER_DISK
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void ledtrig_disk_activity(bool write);
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#else
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static inline void ledtrig_disk_activity(bool write) {}
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#endif
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#ifdef CONFIG_LEDS_TRIGGER_MTD
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void ledtrig_mtd_activity(void);
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#else
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static inline void ledtrig_mtd_activity(void) {}
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#endif
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#if defined(CONFIG_LEDS_TRIGGER_CAMERA) || defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE)
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void ledtrig_flash_ctrl(bool on);
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void ledtrig_torch_ctrl(bool on);
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#else
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static inline void ledtrig_flash_ctrl(bool on) {}
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static inline void ledtrig_torch_ctrl(bool on) {}
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#endif
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/*
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* Generic LED platform data for describing LED names and default triggers.
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*/
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struct led_info {
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const char *name;
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const char *default_trigger;
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int flags;
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};
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struct led_platform_data {
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int num_leds;
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struct led_info *leds;
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};
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struct led_properties {
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u32 color;
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bool color_present;
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const char *function;
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u32 func_enum;
|
|
bool func_enum_present;
|
|
const char *label;
|
|
};
|
|
|
|
struct gpio_desc;
|
|
typedef int (*gpio_blink_set_t)(struct gpio_desc *desc, int state,
|
|
unsigned long *delay_on,
|
|
unsigned long *delay_off);
|
|
|
|
/* For the leds-gpio driver */
|
|
struct gpio_led {
|
|
const char *name;
|
|
const char *default_trigger;
|
|
unsigned gpio;
|
|
unsigned active_low : 1;
|
|
unsigned retain_state_suspended : 1;
|
|
unsigned panic_indicator : 1;
|
|
unsigned default_state : 2;
|
|
unsigned retain_state_shutdown : 1;
|
|
/* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
|
|
struct gpio_desc *gpiod;
|
|
};
|
|
#define LEDS_GPIO_DEFSTATE_OFF 0
|
|
#define LEDS_GPIO_DEFSTATE_ON 1
|
|
#define LEDS_GPIO_DEFSTATE_KEEP 2
|
|
|
|
struct gpio_led_platform_data {
|
|
int num_leds;
|
|
const struct gpio_led *leds;
|
|
|
|
#define GPIO_LED_NO_BLINK_LOW 0 /* No blink GPIO state low */
|
|
#define GPIO_LED_NO_BLINK_HIGH 1 /* No blink GPIO state high */
|
|
#define GPIO_LED_BLINK 2 /* Please, blink */
|
|
gpio_blink_set_t gpio_blink_set;
|
|
};
|
|
|
|
#ifdef CONFIG_NEW_LEDS
|
|
struct platform_device *gpio_led_register_device(
|
|
int id, const struct gpio_led_platform_data *pdata);
|
|
#else
|
|
static inline struct platform_device *gpio_led_register_device(
|
|
int id, const struct gpio_led_platform_data *pdata)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
enum cpu_led_event {
|
|
CPU_LED_IDLE_START, /* CPU enters idle */
|
|
CPU_LED_IDLE_END, /* CPU idle ends */
|
|
CPU_LED_START, /* Machine starts, especially resume */
|
|
CPU_LED_STOP, /* Machine stops, especially suspend */
|
|
CPU_LED_HALTED, /* Machine shutdown */
|
|
};
|
|
#ifdef CONFIG_LEDS_TRIGGER_CPU
|
|
void ledtrig_cpu(enum cpu_led_event evt);
|
|
#else
|
|
static inline void ledtrig_cpu(enum cpu_led_event evt)
|
|
{
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
|
|
void led_classdev_notify_brightness_hw_changed(
|
|
struct led_classdev *led_cdev, enum led_brightness brightness);
|
|
#else
|
|
static inline void led_classdev_notify_brightness_hw_changed(
|
|
struct led_classdev *led_cdev, enum led_brightness brightness) { }
|
|
#endif
|
|
|
|
/**
|
|
* struct led_pattern - pattern interval settings
|
|
* @delta_t: pattern interval delay, in milliseconds
|
|
* @brightness: pattern interval brightness
|
|
*/
|
|
struct led_pattern {
|
|
u32 delta_t;
|
|
int brightness;
|
|
};
|
|
|
|
enum led_audio {
|
|
LED_AUDIO_MUTE, /* master mute LED */
|
|
LED_AUDIO_MICMUTE, /* mic mute LED */
|
|
NUM_AUDIO_LEDS
|
|
};
|
|
|
|
#if IS_ENABLED(CONFIG_LEDS_TRIGGER_AUDIO)
|
|
enum led_brightness ledtrig_audio_get(enum led_audio type);
|
|
void ledtrig_audio_set(enum led_audio type, enum led_brightness state);
|
|
#else
|
|
static inline enum led_brightness ledtrig_audio_get(enum led_audio type)
|
|
{
|
|
return LED_OFF;
|
|
}
|
|
static inline void ledtrig_audio_set(enum led_audio type,
|
|
enum led_brightness state)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#endif /* __LINUX_LEDS_H_INCLUDED */
|