Commit 9c78ff6e authored by Pavel Machek's avatar Pavel Machek Committed by Richard Purdie
Browse files

leds: Add driver for HP harddisk protection LEDs 



HP notebooks contain accelerometer-based disk protection subsystem,
and LED that indicates hard disk is protected. This is driver for the
LED part.

Signed-off-by: default avatarPavel Machek <pavel@suse.cz>
Signed-off-by: default avatarRichard Purdie <rpurdie@linux.intel.com>
parent 0adaf6e4

drivers/leds/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -113,6 +113,13 @@ config LEDS_GPIO 
	  outputs. To be useful the particular board must have LEDs

	  and they must be connected to the GPIO lines.



config LEDS_HP_DISK

	tristate "LED Support for disk protection LED on HP notebooks"

	depends on LEDS_CLASS && ACPI

	help

	  This option enable support for disk protection LED, found on

	  newer HP notebooks.



config LEDS_CLEVO_MAIL

	tristate "Mail LED on Clevo notebook (EXPERIMENTAL)"

	depends on LEDS_CLASS && X86 && SERIO_I8042 && DMI && EXPERIMENTAL

drivers/leds/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ obj-$(CONFIG_LEDS_HP6XX) += leds-hp6xx.o 
obj-$(CONFIG_LEDS_FSG)			+= leds-fsg.o

obj-$(CONFIG_LEDS_PCA955X)		+= leds-pca955x.o

obj-$(CONFIG_LEDS_DA903X)		+= leds-da903x.o

obj-$(CONFIG_LEDS_HP_DISK)		+= leds-hp-disk.o



# LED Triggers

obj-$(CONFIG_LEDS_TRIGGER_TIMER)	+= ledtrig-timer.o

drivers/leds/leds-hp-disk.c

0 → 100644
+156 −0
Original line number Diff line number Diff line 
/*

 *  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/version.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 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,

};



#ifdef CONFIG_PM

static int hpled_suspend(struct acpi_device *dev, pm_message_t state)

{

	led_classdev_suspend(&hpled_led);

	return 0;

}



static int hpled_resume(struct acpi_device *dev)

{

	led_classdev_resume(&hpled_led);

	return 0;

}

#else

#define hpled_suspend NULL

#define hpled_resume NULL

#endif



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);

	acpi_driver_data(device) = &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,

		.suspend = hpled_suspend,

		.resume  = hpled_resume,

	}

};



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);