mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 08:44:21 +08:00
72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
/*
|
|
* Driver for the LED found on the EBSA110 machine
|
|
* Based on Versatile and RealView machine LED code
|
|
*
|
|
* License terms: GNU General Public License (GPL) version 2
|
|
* Author: Bryan Wu <bryan.wu@canonical.com>
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/leds.h>
|
|
|
|
#include <asm/mach-types.h>
|
|
|
|
#include "core.h"
|
|
|
|
#if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS)
|
|
static void ebsa110_led_set(struct led_classdev *cdev,
|
|
enum led_brightness b)
|
|
{
|
|
u8 reg = __raw_readb(SOFT_BASE);
|
|
|
|
if (b != LED_OFF)
|
|
reg |= 0x80;
|
|
else
|
|
reg &= ~0x80;
|
|
|
|
__raw_writeb(reg, SOFT_BASE);
|
|
}
|
|
|
|
static enum led_brightness ebsa110_led_get(struct led_classdev *cdev)
|
|
{
|
|
u8 reg = __raw_readb(SOFT_BASE);
|
|
|
|
return (reg & 0x80) ? LED_FULL : LED_OFF;
|
|
}
|
|
|
|
static int __init ebsa110_leds_init(void)
|
|
{
|
|
|
|
struct led_classdev *cdev;
|
|
int ret;
|
|
|
|
if (!machine_is_ebsa110())
|
|
return -ENODEV;
|
|
|
|
cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
|
|
if (!cdev)
|
|
return -ENOMEM;
|
|
|
|
cdev->name = "ebsa110:0";
|
|
cdev->brightness_set = ebsa110_led_set;
|
|
cdev->brightness_get = ebsa110_led_get;
|
|
cdev->default_trigger = "heartbeat";
|
|
|
|
ret = led_classdev_register(NULL, cdev);
|
|
if (ret < 0) {
|
|
kfree(cdev);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Since we may have triggers on any subsystem, defer registration
|
|
* until after subsystem_init.
|
|
*/
|
|
fs_initcall(ebsa110_leds_init);
|
|
#endif
|