mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 01:20:52 +07:00
11f7000221
Reading /sys/class/leds/<led>/trigger returns all available LED triggers. However, the size of this file is limited to PAGE_SIZE because of the limitation for sysfs attribute. Enabling LED CPU trigger on systems with thousands of CPUs easily hits PAGE_SIZE limit, and makes it impossible to see all available LED triggers and which trigger is currently activated. We work around it here by converting /sys/class/leds/<led>/trigger to binary attribute, which is not limited by length. This is _not_ good design, do not copy it. Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com> Cc: "Rafael J. Wysocki" <rafael@kernel.org> Cc: Pavel Machek <pavel@ucw.cz> Cc: Dan Murphy <dmurphy@ti.com>A Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Pavel Machek <pavel@ucw.cz>
39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* LED Core
|
|
*
|
|
* Copyright 2005 Openedhand Ltd.
|
|
*
|
|
* Author: Richard Purdie <rpurdie@openedhand.com>
|
|
*/
|
|
#ifndef __LEDS_H_INCLUDED
|
|
#define __LEDS_H_INCLUDED
|
|
|
|
#include <linux/rwsem.h>
|
|
#include <linux/leds.h>
|
|
|
|
static inline int led_get_brightness(struct led_classdev *led_cdev)
|
|
{
|
|
return led_cdev->brightness;
|
|
}
|
|
|
|
void led_init_core(struct led_classdev *led_cdev);
|
|
void led_stop_software_blink(struct led_classdev *led_cdev);
|
|
void led_set_brightness_nopm(struct led_classdev *led_cdev,
|
|
enum led_brightness value);
|
|
void led_set_brightness_nosleep(struct led_classdev *led_cdev,
|
|
enum led_brightness value);
|
|
ssize_t led_trigger_read(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *attr, char *buf,
|
|
loff_t pos, size_t count);
|
|
ssize_t led_trigger_write(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *bin_attr, char *buf,
|
|
loff_t pos, size_t count);
|
|
|
|
extern struct rw_semaphore leds_list_lock;
|
|
extern struct list_head leds_list;
|
|
extern struct list_head trigger_list;
|
|
extern const char * const led_colors[LED_COLOR_ID_MAX];
|
|
|
|
#endif /* __LEDS_H_INCLUDED */
|