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/* This is obsolete/useless.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