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/*
* leds-hp-disk.c - driver for HP "hard disk protection" LED
*
* Copyright (C) 2008 Pavel Machek
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/dmi.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/input.h>
#include <linux/kthread.h>
#include <linux/leds.h>
#include <acpi/acpi_drivers.h>
#define DRIVER_NAME "leds-hp-disk"
#define ACPI_MDPS_CLASS "led"
/* For automatic insertion of the module */
static struct acpi_device_id hpled_device_ids[] = {
{"HPQ0004", 0}, /* HP Mobile Data Protection System PNP */
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, hpled_device_ids);
struct acpi_hpled {
struct acpi_device *device; /* The ACPI device */
};
static struct acpi_hpled adev;
static acpi_status hpled_acpi_write(acpi_handle handle, int reg)
{
unsigned long long ret; /* Not used when writing */
union acpi_object in_obj[1];
struct acpi_object_list args = { 1, in_obj };
in_obj[0].type = ACPI_TYPE_INTEGER;
in_obj[0].integer.value = reg;
return acpi_evaluate_integer(handle, "ALED", &args, &ret);
}
static void hpled_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
hpled_acpi_write(adev.device->handle, !!value);
}
static struct led_classdev hpled_led = {
.name = "hp:red:hddprotection",
.default_trigger = "heartbeat",
.brightness_set = hpled_set,
.flags = LED_CORE_SUSPENDRESUME,
};
static int hpled_add(struct acpi_device *device)
{
int ret;
if (!device)
return -EINVAL;
adev.device = device;
strcpy(acpi_device_name(device), DRIVER_NAME);
strcpy(acpi_device_class(device), ACPI_MDPS_CLASS);
device->driver_data = &adev;
ret = led_classdev_register(NULL, &hpled_led);
return ret;
}
static int hpled_remove(struct acpi_device *device, int type)
{
if (!device)
return -EINVAL;
led_classdev_unregister(&hpled_led);
return 0;
}
static struct acpi_driver leds_hp_driver = {
.name = DRIVER_NAME,
.class = ACPI_MDPS_CLASS,
.ids = hpled_device_ids,
.ops = {
.add = hpled_add,
.remove = hpled_remove,
}
};
static int __init hpled_init_module(void)
{
int ret;
if (acpi_disabled)
return -ENODEV;
ret = acpi_bus_register_driver(&leds_hp_driver);
if (ret < 0)
return ret;
printk(KERN_INFO DRIVER_NAME " driver loaded.\n");
return 0;
}
static void __exit hpled_exit_module(void)
{
acpi_bus_unregister_driver(&leds_hp_driver);
}
MODULE_DESCRIPTION("Driver for HP disk protection LED");
MODULE_AUTHOR("Pavel Machek <pavel@suse.cz>");
MODULE_LICENSE("GPL");
module_init(hpled_init_module);
module_exit(hpled_exit_module);
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