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Commit a5fa429b authored by Corentin Chary's avatar Corentin Chary Committed by Len Brown
Browse files

eeepc-laptop: add backlight 



Add backlight class support to the eeepc-laptop driver.

Signed-off-by: default avatarCorentin Chary <corentincj@iksaif.net>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent e59f8796

drivers/misc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -355,6 +355,7 @@ config EEEPC_LAPTOP 
	tristate "Eee PC Hotkey Driver (EXPERIMENTAL)"

	depends on X86

	depends on ACPI

	depends on BACKLIGHT_CLASS_DEVICE

	depends on EXPERIMENTAL

	---help---

	  This driver supports the Fn-Fx keys on Eee PC laptops.

drivers/misc/eeepc-laptop.c

+77 −0
Original line number Diff line number Diff line
@@ -21,6 +21,8 @@ 
#include <linux/init.h>

#include <linux/types.h>

#include <linux/platform_device.h>

#include <linux/backlight.h>

#include <linux/fb.h>

#include <acpi/acpi_drivers.h>

#include <acpi/acpi_bus.h>

#include <linux/uaccess.h>
@@ -43,6 +45,8 @@ 
 * Definitions for Asus EeePC

 */

#define	NOTIFY_WLAN_ON	0x10

#define NOTIFY_BRN_MIN	0x20

#define NOTIFY_BRN_MAX	0x2f



enum {

	DISABLE_ASL_WLAN = 0x0001,
@@ -147,6 +151,19 @@ static struct acpi_driver eeepc_hotk_driver = { 
	},

};



/* The backlight device /sys/class/backlight */

static struct backlight_device *eeepc_backlight_device;



/*

 * The backlight class declaration

 */

static int read_brightness(struct backlight_device *bd);

static int update_bl_status(struct backlight_device *bd);

static struct backlight_ops eeepcbl_ops = {

	.get_brightness = read_brightness,

	.update_status = update_bl_status,

};



MODULE_AUTHOR("Corentin Chary, Eric Cooper");

MODULE_DESCRIPTION(EEEPC_HOTK_NAME);

MODULE_LICENSE("GPL");
@@ -210,6 +227,25 @@ static int get_acpi(int cm) 
	return value;

}



/*

 * Backlight

 */

static int read_brightness(struct backlight_device *bd)

{

	return get_acpi(CM_ASL_PANELBRIGHT);

}



static int set_brightness(struct backlight_device *bd, int value)

{

	value = max(0, min(15, value));

	return set_acpi(CM_ASL_PANELBRIGHT, value);

}



static int update_bl_status(struct backlight_device *bd)

{

	return set_brightness(bd, bd->props.brightness);

}



/*

 * Sys helpers

 */
@@ -328,12 +364,20 @@ static void notify_wlan(u32 *event) 
	}

}



static void notify_brn(void)

{

	struct backlight_device *bd = eeepc_backlight_device;

	bd->props.brightness = read_brightness(bd);

}



static void eeepc_hotk_notify(acpi_handle handle, u32 event, void *data)

{

	if (!ehotk)

		return;

	if (event == NOTIFY_WLAN_ON && (DISABLE_ASL_WLAN & ehotk->init_flag))

		notify_wlan(&event);

	if (event >= NOTIFY_BRN_MIN && event <= NOTIFY_BRN_MAX)

		notify_brn();

	acpi_bus_generate_proc_event(ehotk->device, event,

				     ehotk->event_count[event % 128]++);

}
@@ -387,8 +431,16 @@ static int eeepc_hotk_remove(struct acpi_device *device, int type) 
/*

 * exit/init

 */

static void eeepc_backlight_exit(void)

{

	if (eeepc_backlight_device)

		backlight_device_unregister(eeepc_backlight_device);

	eeepc_backlight_device = NULL;

}



static void __exit eeepc_laptop_exit(void)

{

	eeepc_backlight_exit();

	acpi_bus_unregister_driver(&eeepc_hotk_driver);

	sysfs_remove_group(&platform_device->dev.kobj,

			   &platform_attribute_group);
@@ -396,6 +448,26 @@ static void __exit eeepc_laptop_exit(void) 
	platform_driver_unregister(&platform_driver);

}



static int eeepc_backlight_init(struct device *dev)

{

	struct backlight_device *bd;



	bd = backlight_device_register(EEEPC_HOTK_FILE, dev,

				       NULL, &eeepcbl_ops);

	if (IS_ERR(bd)) {

		printk(EEEPC_ERR

		       "Could not register eeepc backlight device\n");

		eeepc_backlight_device = NULL;

		return PTR_ERR(bd);

	}

	eeepc_backlight_device = bd;

	bd->props.max_brightness = 15;

	bd->props.brightness = read_brightness(NULL);

	bd->props.power = FB_BLANK_UNBLANK;

	backlight_update_status(bd);

	return 0;

}



static int __init eeepc_laptop_init(void)

{

	struct device *dev;
@@ -411,6 +483,9 @@ static int __init eeepc_laptop_init(void) 
		return -ENODEV;

	}

	dev = acpi_get_physical_device(ehotk->device->handle);

	result = eeepc_backlight_init(dev);

	if (result)

		goto fail_backlight;

	/* Register platform stuff */

	result = platform_driver_register(&platform_driver);

	if (result)
@@ -435,6 +510,8 @@ static int __init eeepc_laptop_init(void) 
fail_platform_device1:

	platform_driver_unregister(&platform_driver);

fail_platform_driver:

	eeepc_backlight_exit();

fail_backlight:

	return result;

}