450 lines
14 KiB
C
450 lines
14 KiB
C
/*
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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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* 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_LEDS_H_INCLUDED
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#define __LINUX_LEDS_H_INCLUDED
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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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/*
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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_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 (1 << 0)
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#define LED_UNREGISTERING (1 << 1)
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/* Upper 16 bits reflect control information */
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#define LED_CORE_SUSPENDRESUME (1 << 16)
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#define LED_SYSFS_DISABLE (1 << 17)
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#define LED_DEV_CAP_FLASH (1 << 18)
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#define LED_HW_PLUGGABLE (1 << 19)
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#define LED_PANIC_INDICATOR (1 << 20)
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#define LED_BRIGHT_HW_CHANGED (1 << 21)
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#define LED_RETAIN_AT_SHUTDOWN (1 << 22)
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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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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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extern int of_led_classdev_register(struct device *parent,
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struct device_node *np,
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struct led_classdev *led_cdev);
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#define led_classdev_register(parent, led_cdev) \
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of_led_classdev_register(parent, NULL, led_cdev)
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extern int devm_of_led_classdev_register(struct device *parent,
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struct device_node *np,
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struct led_classdev *led_cdev);
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#define devm_led_classdev_register(parent, led_cdev) \
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devm_of_led_classdev_register(parent, NULL, led_cdev)
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extern void led_classdev_unregister(struct led_classdev *led_cdev);
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extern void devm_led_classdev_unregister(struct device *parent,
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struct led_classdev *led_cdev);
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extern void led_classdev_suspend(struct led_classdev *led_cdev);
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extern void led_classdev_resume(struct led_classdev *led_cdev);
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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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extern void led_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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/**
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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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extern void led_blink_set_oneshot(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 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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extern 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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* @brightness: 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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extern 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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extern int led_update_brightness(struct led_classdev *led_cdev);
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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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extern 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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extern void led_sysfs_enable(struct led_classdev *led_cdev);
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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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void (*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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};
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ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count);
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ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
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char *buf);
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/* Registration functions for complex triggers */
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extern int led_trigger_register(struct led_trigger *trigger);
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extern void led_trigger_unregister(struct led_trigger *trigger);
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extern int devm_led_trigger_register(struct device *dev,
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struct led_trigger *trigger);
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extern void led_trigger_register_simple(const char *name,
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struct led_trigger **trigger);
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extern void led_trigger_unregister_simple(struct led_trigger *trigger);
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extern void led_trigger_event(struct led_trigger *trigger,
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enum led_brightness event);
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extern 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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extern 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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extern void led_trigger_set_default(struct led_classdev *led_cdev);
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extern void led_trigger_set(struct led_classdev *led_cdev,
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struct led_trigger *trigger);
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extern void led_trigger_remove(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 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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extern void led_trigger_rename_static(const char *name,
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struct led_trigger *trig);
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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 void led_trigger_set(struct led_classdev *led_cdev,
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struct led_trigger *trigger) {}
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static inline void led_trigger_remove(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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extern void ledtrig_disk_activity(void);
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#else
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static inline void ledtrig_disk_activity(void) {}
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#endif
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#ifdef CONFIG_LEDS_TRIGGER_MTD
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extern 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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extern void ledtrig_flash_ctrl(bool on);
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extern 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 gpio_desc;
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typedef int (*gpio_blink_set_t)(struct gpio_desc *desc, int state,
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unsigned long *delay_on,
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unsigned long *delay_off);
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/* For the leds-gpio driver */
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struct gpio_led {
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const char *name;
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const char *default_trigger;
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unsigned gpio;
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unsigned active_low : 1;
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unsigned retain_state_suspended : 1;
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unsigned panic_indicator : 1;
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unsigned default_state : 2;
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unsigned retain_state_shutdown : 1;
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/* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
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struct gpio_desc *gpiod;
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};
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#define LEDS_GPIO_DEFSTATE_OFF 0
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#define LEDS_GPIO_DEFSTATE_ON 1
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#define LEDS_GPIO_DEFSTATE_KEEP 2
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struct gpio_led_platform_data {
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int num_leds;
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const struct gpio_led *leds;
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#define GPIO_LED_NO_BLINK_LOW 0 /* No blink GPIO state low */
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#define GPIO_LED_NO_BLINK_HIGH 1 /* No blink GPIO state high */
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#define GPIO_LED_BLINK 2 /* Please, blink */
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gpio_blink_set_t gpio_blink_set;
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};
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#ifdef CONFIG_NEW_LEDS
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struct platform_device *gpio_led_register_device(
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int id, const struct gpio_led_platform_data *pdata);
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#else
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static inline struct platform_device *gpio_led_register_device(
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int id, const struct gpio_led_platform_data *pdata)
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{
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return 0;
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}
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#endif
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enum cpu_led_event {
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CPU_LED_IDLE_START, /* CPU enters idle */
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CPU_LED_IDLE_END, /* CPU idle ends */
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CPU_LED_START, /* Machine starts, especially resume */
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CPU_LED_STOP, /* Machine stops, especially suspend */
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CPU_LED_HALTED, /* Machine shutdown */
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};
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#ifdef CONFIG_LEDS_TRIGGER_CPU
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extern void ledtrig_cpu(enum cpu_led_event evt);
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#else
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static inline void ledtrig_cpu(enum cpu_led_event evt)
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{
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return;
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}
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#endif
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#ifdef CONFIG_LEDS_BRIGHTNESS_HW_CHANGED
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extern void led_classdev_notify_brightness_hw_changed(
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struct led_classdev *led_cdev, enum led_brightness brightness);
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#else
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static inline void led_classdev_notify_brightness_hw_changed(
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struct led_classdev *led_cdev, enum led_brightness brightness) { }
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#endif
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#endif /* __LINUX_LEDS_H_INCLUDED */
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