72 lines
1.4 KiB
C
72 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for the LED found on the EBSA110 machine
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* Based on Versatile and RealView machine LED code
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*
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* Author: Bryan Wu <bryan.wu@canonical.com>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/leds.h>
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#include <asm/mach-types.h>
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#include "core.h"
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#if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS)
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static void ebsa110_led_set(struct led_classdev *cdev,
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enum led_brightness b)
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{
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u8 reg = __raw_readb(SOFT_BASE);
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if (b != LED_OFF)
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reg |= 0x80;
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else
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reg &= ~0x80;
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__raw_writeb(reg, SOFT_BASE);
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}
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static enum led_brightness ebsa110_led_get(struct led_classdev *cdev)
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{
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u8 reg = __raw_readb(SOFT_BASE);
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return (reg & 0x80) ? LED_FULL : LED_OFF;
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}
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static int __init ebsa110_leds_init(void)
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{
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struct led_classdev *cdev;
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int ret;
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if (!machine_is_ebsa110())
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return -ENODEV;
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cdev = kzalloc(sizeof(*cdev), GFP_KERNEL);
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if (!cdev)
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return -ENOMEM;
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cdev->name = "ebsa110:0";
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cdev->brightness_set = ebsa110_led_set;
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cdev->brightness_get = ebsa110_led_get;
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cdev->default_trigger = "heartbeat";
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ret = led_classdev_register(NULL, cdev);
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if (ret < 0) {
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kfree(cdev);
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return ret;
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}
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return 0;
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}
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/*
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* Since we may have triggers on any subsystem, defer registration
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* until after subsystem_init.
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*/
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fs_initcall(ebsa110_leds_init);
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#endif
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