mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Fabio Baltieri](/assets/img/avatar_default.png)
This reverts commit a0193cbee0
.
The problem with the original commit was that it caused a warning with
the MMC trigger calling del_timer_sync from hard-irq context.
Signed-off-by: Fabio Baltieri <fabio.baltieri@gmail.com>
Reported-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
309 lines
7.8 KiB
C
309 lines
7.8 KiB
C
/*
|
|
* LED Triggers Core
|
|
*
|
|
* Copyright 2005-2007 Openedhand Ltd.
|
|
*
|
|
* Author: 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.
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/list.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/device.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/rwsem.h>
|
|
#include <linux/leds.h>
|
|
#include <linux/slab.h>
|
|
#include "leds.h"
|
|
|
|
/*
|
|
* Nests outside led_cdev->trigger_lock
|
|
*/
|
|
static DECLARE_RWSEM(triggers_list_lock);
|
|
static LIST_HEAD(trigger_list);
|
|
|
|
/* Used by LED Class */
|
|
|
|
ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
|
char trigger_name[TRIG_NAME_MAX];
|
|
struct led_trigger *trig;
|
|
size_t len;
|
|
|
|
trigger_name[sizeof(trigger_name) - 1] = '\0';
|
|
strncpy(trigger_name, buf, sizeof(trigger_name) - 1);
|
|
len = strlen(trigger_name);
|
|
|
|
if (len && trigger_name[len - 1] == '\n')
|
|
trigger_name[len - 1] = '\0';
|
|
|
|
if (!strcmp(trigger_name, "none")) {
|
|
led_trigger_remove(led_cdev);
|
|
return count;
|
|
}
|
|
|
|
down_read(&triggers_list_lock);
|
|
list_for_each_entry(trig, &trigger_list, next_trig) {
|
|
if (!strcmp(trigger_name, trig->name)) {
|
|
down_write(&led_cdev->trigger_lock);
|
|
led_trigger_set(led_cdev, trig);
|
|
up_write(&led_cdev->trigger_lock);
|
|
|
|
up_read(&triggers_list_lock);
|
|
return count;
|
|
}
|
|
}
|
|
up_read(&triggers_list_lock);
|
|
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(led_trigger_store);
|
|
|
|
ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct led_classdev *led_cdev = dev_get_drvdata(dev);
|
|
struct led_trigger *trig;
|
|
int len = 0;
|
|
|
|
down_read(&triggers_list_lock);
|
|
down_read(&led_cdev->trigger_lock);
|
|
|
|
if (!led_cdev->trigger)
|
|
len += sprintf(buf+len, "[none] ");
|
|
else
|
|
len += sprintf(buf+len, "none ");
|
|
|
|
list_for_each_entry(trig, &trigger_list, next_trig) {
|
|
if (led_cdev->trigger && !strcmp(led_cdev->trigger->name,
|
|
trig->name))
|
|
len += sprintf(buf+len, "[%s] ", trig->name);
|
|
else
|
|
len += sprintf(buf+len, "%s ", trig->name);
|
|
}
|
|
up_read(&led_cdev->trigger_lock);
|
|
up_read(&triggers_list_lock);
|
|
|
|
len += sprintf(len+buf, "\n");
|
|
return len;
|
|
}
|
|
EXPORT_SYMBOL_GPL(led_trigger_show);
|
|
|
|
/* Caller must ensure led_cdev->trigger_lock held */
|
|
void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
|
|
{
|
|
unsigned long flags;
|
|
|
|
/* Remove any existing trigger */
|
|
if (led_cdev->trigger) {
|
|
write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags);
|
|
list_del(&led_cdev->trig_list);
|
|
write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock,
|
|
flags);
|
|
if (led_cdev->trigger->deactivate)
|
|
led_cdev->trigger->deactivate(led_cdev);
|
|
led_cdev->trigger = NULL;
|
|
led_set_brightness(led_cdev, LED_OFF);
|
|
}
|
|
if (trig) {
|
|
write_lock_irqsave(&trig->leddev_list_lock, flags);
|
|
list_add_tail(&led_cdev->trig_list, &trig->led_cdevs);
|
|
write_unlock_irqrestore(&trig->leddev_list_lock, flags);
|
|
led_cdev->trigger = trig;
|
|
if (trig->activate)
|
|
trig->activate(led_cdev);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(led_trigger_set);
|
|
|
|
void led_trigger_remove(struct led_classdev *led_cdev)
|
|
{
|
|
down_write(&led_cdev->trigger_lock);
|
|
led_trigger_set(led_cdev, NULL);
|
|
up_write(&led_cdev->trigger_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(led_trigger_remove);
|
|
|
|
void led_trigger_set_default(struct led_classdev *led_cdev)
|
|
{
|
|
struct led_trigger *trig;
|
|
|
|
if (!led_cdev->default_trigger)
|
|
return;
|
|
|
|
down_read(&triggers_list_lock);
|
|
down_write(&led_cdev->trigger_lock);
|
|
list_for_each_entry(trig, &trigger_list, next_trig) {
|
|
if (!strcmp(led_cdev->default_trigger, trig->name))
|
|
led_trigger_set(led_cdev, trig);
|
|
}
|
|
up_write(&led_cdev->trigger_lock);
|
|
up_read(&triggers_list_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(led_trigger_set_default);
|
|
|
|
/* LED Trigger Interface */
|
|
|
|
int led_trigger_register(struct led_trigger *trig)
|
|
{
|
|
struct led_classdev *led_cdev;
|
|
struct led_trigger *_trig;
|
|
|
|
rwlock_init(&trig->leddev_list_lock);
|
|
INIT_LIST_HEAD(&trig->led_cdevs);
|
|
|
|
down_write(&triggers_list_lock);
|
|
/* Make sure the trigger's name isn't already in use */
|
|
list_for_each_entry(_trig, &trigger_list, next_trig) {
|
|
if (!strcmp(_trig->name, trig->name)) {
|
|
up_write(&triggers_list_lock);
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
/* Add to the list of led triggers */
|
|
list_add_tail(&trig->next_trig, &trigger_list);
|
|
up_write(&triggers_list_lock);
|
|
|
|
/* Register with any LEDs that have this as a default trigger */
|
|
down_read(&leds_list_lock);
|
|
list_for_each_entry(led_cdev, &leds_list, node) {
|
|
down_write(&led_cdev->trigger_lock);
|
|
if (!led_cdev->trigger && led_cdev->default_trigger &&
|
|
!strcmp(led_cdev->default_trigger, trig->name))
|
|
led_trigger_set(led_cdev, trig);
|
|
up_write(&led_cdev->trigger_lock);
|
|
}
|
|
up_read(&leds_list_lock);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(led_trigger_register);
|
|
|
|
void led_trigger_unregister(struct led_trigger *trig)
|
|
{
|
|
struct led_classdev *led_cdev;
|
|
|
|
/* Remove from the list of led triggers */
|
|
down_write(&triggers_list_lock);
|
|
list_del(&trig->next_trig);
|
|
up_write(&triggers_list_lock);
|
|
|
|
/* Remove anyone actively using this trigger */
|
|
down_read(&leds_list_lock);
|
|
list_for_each_entry(led_cdev, &leds_list, node) {
|
|
down_write(&led_cdev->trigger_lock);
|
|
if (led_cdev->trigger == trig)
|
|
led_trigger_set(led_cdev, NULL);
|
|
up_write(&led_cdev->trigger_lock);
|
|
}
|
|
up_read(&leds_list_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(led_trigger_unregister);
|
|
|
|
/* Simple LED Tigger Interface */
|
|
|
|
void led_trigger_event(struct led_trigger *trig,
|
|
enum led_brightness brightness)
|
|
{
|
|
struct list_head *entry;
|
|
|
|
if (!trig)
|
|
return;
|
|
|
|
read_lock(&trig->leddev_list_lock);
|
|
list_for_each(entry, &trig->led_cdevs) {
|
|
struct led_classdev *led_cdev;
|
|
|
|
led_cdev = list_entry(entry, struct led_classdev, trig_list);
|
|
__led_set_brightness(led_cdev, brightness);
|
|
}
|
|
read_unlock(&trig->leddev_list_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(led_trigger_event);
|
|
|
|
static void led_trigger_blink_setup(struct led_trigger *trig,
|
|
unsigned long *delay_on,
|
|
unsigned long *delay_off,
|
|
int oneshot,
|
|
int invert)
|
|
{
|
|
struct list_head *entry;
|
|
|
|
if (!trig)
|
|
return;
|
|
|
|
read_lock(&trig->leddev_list_lock);
|
|
list_for_each(entry, &trig->led_cdevs) {
|
|
struct led_classdev *led_cdev;
|
|
|
|
led_cdev = list_entry(entry, struct led_classdev, trig_list);
|
|
if (oneshot)
|
|
led_blink_set_oneshot(led_cdev, delay_on, delay_off,
|
|
invert);
|
|
else
|
|
led_blink_set(led_cdev, delay_on, delay_off);
|
|
}
|
|
read_unlock(&trig->leddev_list_lock);
|
|
}
|
|
|
|
void led_trigger_blink(struct led_trigger *trig,
|
|
unsigned long *delay_on,
|
|
unsigned long *delay_off)
|
|
{
|
|
led_trigger_blink_setup(trig, delay_on, delay_off, 0, 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(led_trigger_blink);
|
|
|
|
void led_trigger_blink_oneshot(struct led_trigger *trig,
|
|
unsigned long *delay_on,
|
|
unsigned long *delay_off,
|
|
int invert)
|
|
{
|
|
led_trigger_blink_setup(trig, delay_on, delay_off, 1, invert);
|
|
}
|
|
EXPORT_SYMBOL_GPL(led_trigger_blink_oneshot);
|
|
|
|
void led_trigger_register_simple(const char *name, struct led_trigger **tp)
|
|
{
|
|
struct led_trigger *trig;
|
|
int err;
|
|
|
|
trig = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);
|
|
|
|
if (trig) {
|
|
trig->name = name;
|
|
err = led_trigger_register(trig);
|
|
if (err < 0) {
|
|
kfree(trig);
|
|
trig = NULL;
|
|
printk(KERN_WARNING "LED trigger %s failed to register"
|
|
" (%d)\n", name, err);
|
|
}
|
|
} else
|
|
printk(KERN_WARNING "LED trigger %s failed to register"
|
|
" (no memory)\n", name);
|
|
|
|
*tp = trig;
|
|
}
|
|
EXPORT_SYMBOL_GPL(led_trigger_register_simple);
|
|
|
|
void led_trigger_unregister_simple(struct led_trigger *trig)
|
|
{
|
|
if (trig)
|
|
led_trigger_unregister(trig);
|
|
kfree(trig);
|
|
}
|
|
EXPORT_SYMBOL_GPL(led_trigger_unregister_simple);
|
|
|
|
MODULE_AUTHOR("Richard Purdie");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("LED Triggers Core");
|