![Linus Torvalds](/assets/img/avatar_default.png)
Pull LED subsystem update from Bryan Wu. * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds: (24 commits) leds: add output driver configuration for pca9633 led driver leds: lm3642: Use regmap_update_bits() in lm3642_chip_init() leds: Add new LED driver for lm3642 chips leds-lp5523: Fix riskiness of the page fault leds-lp5523: turn off the LED engines on unloading the driver leds-lm3530: Fix smatch warnings leds-lm3530: Use devm_regulator_get function leds: leds-gpio: adopt pinctrl support leds: Add new LED driver for lm355x chips leds-lp5523: use the i2c device id rather than fixed name leds-lp5523: add new device id for LP55231 leds-lp5523: support new LP55231 device leds: triggers: send uevent when changing triggers leds-lp5523: minor code style fixes leds-lp5523: change the return type of lp5523_set_mode() leds-lp5523: set the brightness to 0 forcely on removing the driver leds-lp5523: add channel name in the platform data leds: leds-gpio: Use of_get_child_count() helper leds: leds-gpio: Use platform_{get,set}_drvdata leds: leds-gpio: use of_match_ptr() ...
261 lines
7.6 KiB
C
261 lines
7.6 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/list.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/rwsem.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;
|
|
int brightness;
|
|
int max_brightness;
|
|
int flags;
|
|
|
|
/* Lower 16 bits reflect status */
|
|
#define LED_SUSPENDED (1 << 0)
|
|
/* Upper 16 bits reflect control information */
|
|
#define LED_CORE_SUSPENDRESUME (1 << 16)
|
|
#define LED_BLINK_ONESHOT (1 << 17)
|
|
#define LED_BLINK_ONESHOT_STOP (1 << 18)
|
|
#define LED_BLINK_INVERT (1 << 19)
|
|
|
|
/* Set LED brightness level */
|
|
/* Must not sleep, use a workqueue if needed */
|
|
void (*brightness_set)(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 a fixed
|
|
* value via the brightness_set() callback.
|
|
*/
|
|
int (*blink_set)(struct led_classdev *led_cdev,
|
|
unsigned long *delay_on,
|
|
unsigned long *delay_off);
|
|
|
|
struct device *dev;
|
|
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;
|
|
|
|
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
|
|
};
|
|
|
|
extern int led_classdev_register(struct device *parent,
|
|
struct led_classdev *led_cdev);
|
|
extern void led_classdev_unregister(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.
|
|
*/
|
|
extern void led_set_brightness(struct led_classdev *led_cdev,
|
|
enum led_brightness brightness);
|
|
|
|
/*
|
|
* LED Triggers
|
|
*/
|
|
#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;
|
|
};
|
|
|
|
/* Registration functions for complex triggers */
|
|
extern int led_trigger_register(struct led_trigger *trigger);
|
|
extern void led_trigger_unregister(struct led_trigger *trigger);
|
|
|
|
/* 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;
|
|
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);
|
|
|
|
#else
|
|
|
|
/* Triggers aren't active - null macros */
|
|
#define DEFINE_LED_TRIGGER(x)
|
|
#define DEFINE_LED_TRIGGER_GLOBAL(x)
|
|
#define led_trigger_register_simple(x, y) do {} while(0)
|
|
#define led_trigger_unregister_simple(x) do {} while(0)
|
|
#define led_trigger_event(x, y) do {} while(0)
|
|
|
|
#endif
|
|
|
|
/* Trigger specific functions */
|
|
#ifdef CONFIG_LEDS_TRIGGER_IDE_DISK
|
|
extern void ledtrig_ide_activity(void);
|
|
#else
|
|
#define ledtrig_ide_activity() do {} while(0)
|
|
#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;
|
|
};
|
|
|
|
/* 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 default_state : 2;
|
|
/* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
|
|
};
|
|
#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 */
|
|
int (*gpio_blink_set)(unsigned gpio, int state,
|
|
unsigned long *delay_on,
|
|
unsigned long *delay_off);
|
|
};
|
|
|
|
struct platform_device *gpio_led_register_device(
|
|
int id, const struct gpio_led_platform_data *pdata);
|
|
|
|
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 */
|