421 lines
13 KiB
C
421 lines
13 KiB
C
/*
|
|
* Driver model for leds and led triggers
|
|
*
|
|
* Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
|
|
* Copyright (C) 2005 Richard Purdie <rpurdie@openedhand.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_LEDS_H_INCLUDED
|
|
#define __LINUX_LEDS_H_INCLUDED
|
|
|
|
#include <linux/device.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;
|
|
/*
|
|
* LED Core
|
|
*/
|
|
|
|
enum led_brightness {
|
|
LED_OFF = 0,
|
|
LED_HALF = 127,
|
|
LED_FULL = 255,
|
|
};
|
|
|
|
struct led_classdev {
|
|
const char *name;
|
|
enum led_brightness brightness;
|
|
enum led_brightness max_brightness;
|
|
int flags;
|
|
|
|
/* Lower 16 bits reflect status */
|
|
#define LED_SUSPENDED (1 << 0)
|
|
#define LED_UNREGISTERING (1 << 1)
|
|
/* Upper 16 bits reflect control information */
|
|
#define LED_CORE_SUSPENDRESUME (1 << 16)
|
|
#define LED_BLINK_SW (1 << 17)
|
|
#define LED_BLINK_ONESHOT (1 << 18)
|
|
#define LED_BLINK_ONESHOT_STOP (1 << 19)
|
|
#define LED_BLINK_INVERT (1 << 20)
|
|
#define LED_BLINK_BRIGHTNESS_CHANGE (1 << 21)
|
|
#define LED_BLINK_DISABLE (1 << 22)
|
|
#define LED_SYSFS_DISABLE (1 << 23)
|
|
#define LED_DEV_CAP_FLASH (1 << 24)
|
|
#define LED_HW_PLUGGABLE (1 << 25)
|
|
#define LED_PANIC_INDICATOR (1 << 26)
|
|
|
|
/* 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);
|
|
|
|
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;
|
|
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;
|
|
#endif
|
|
|
|
/* Ensures consistent access to the LED Flash Class device */
|
|
struct mutex led_access;
|
|
};
|
|
|
|
extern int led_classdev_register(struct device *parent,
|
|
struct led_classdev *led_cdev);
|
|
extern int devm_led_classdev_register(struct device *parent,
|
|
struct led_classdev *led_cdev);
|
|
extern void led_classdev_unregister(struct led_classdev *led_cdev);
|
|
extern void devm_led_classdev_unregister(struct device *parent,
|
|
struct led_classdev *led_cdev);
|
|
extern void led_classdev_suspend(struct led_classdev *led_cdev);
|
|
extern void led_classdev_resume(struct led_classdev *led_cdev);
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
extern 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.
|
|
*/
|
|
extern 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.
|
|
*/
|
|
extern void led_set_brightness(struct led_classdev *led_cdev,
|
|
enum led_brightness brightness);
|
|
|
|
/**
|
|
* led_set_brightness_sync - set LED brightness synchronously
|
|
* @led_cdev: the LED to set
|
|
* @brightness: 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
|
|
*/
|
|
extern int led_set_brightness_sync(struct led_classdev *led_cdev,
|
|
enum led_brightness 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
|
|
*/
|
|
extern int led_update_brightness(struct led_classdev *led_cdev);
|
|
|
|
/**
|
|
* led_sysfs_disable - disable LED sysfs interface
|
|
* @led_cdev: the LED to set
|
|
*
|
|
* Disable the led_cdev's sysfs interface.
|
|
*/
|
|
extern 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.
|
|
*/
|
|
extern void led_sysfs_enable(struct led_classdev *led_cdev);
|
|
|
|
/**
|
|
* 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;
|
|
void (*activate)(struct led_classdev *led_cdev);
|
|
void (*deactivate)(struct led_classdev *led_cdev);
|
|
|
|
/* 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;
|
|
};
|
|
|
|
ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count);
|
|
ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf);
|
|
|
|
/* Registration functions for complex triggers */
|
|
extern int led_trigger_register(struct led_trigger *trigger);
|
|
extern void led_trigger_unregister(struct led_trigger *trigger);
|
|
extern int devm_led_trigger_register(struct device *dev,
|
|
struct led_trigger *trigger);
|
|
|
|
extern void led_trigger_register_simple(const char *name,
|
|
struct led_trigger **trigger);
|
|
extern void led_trigger_unregister_simple(struct led_trigger *trigger);
|
|
extern void led_trigger_event(struct led_trigger *trigger,
|
|
enum led_brightness event);
|
|
extern void led_trigger_blink(struct led_trigger *trigger,
|
|
unsigned long *delay_on,
|
|
unsigned long *delay_off);
|
|
extern void led_trigger_blink_oneshot(struct led_trigger *trigger,
|
|
unsigned long *delay_on,
|
|
unsigned long *delay_off,
|
|
int invert);
|
|
extern void led_trigger_set_default(struct led_classdev *led_cdev);
|
|
extern void led_trigger_set(struct led_classdev *led_cdev,
|
|
struct led_trigger *trigger);
|
|
extern void led_trigger_remove(struct led_classdev *led_cdev);
|
|
|
|
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.
|
|
*/
|
|
extern void led_trigger_rename_static(const char *name,
|
|
struct led_trigger *trig);
|
|
|
|
#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 void led_trigger_set(struct led_classdev *led_cdev,
|
|
struct led_trigger *trigger) {}
|
|
static inline void led_trigger_remove(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
|
|
extern void ledtrig_disk_activity(void);
|
|
#else
|
|
static inline void ledtrig_disk_activity(void) {}
|
|
#endif
|
|
|
|
#ifdef CONFIG_LEDS_TRIGGER_MTD
|
|
extern 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)
|
|
extern void ledtrig_flash_ctrl(bool on);
|
|
extern 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 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;
|
|
/* 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
|
|
extern void ledtrig_cpu(enum cpu_led_event evt);
|
|
#else
|
|
static inline void ledtrig_cpu(enum cpu_led_event evt)
|
|
{
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
#endif /* __LINUX_LEDS_H_INCLUDED */
|