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eeepc-laptop: add backlight

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Add backlight class support to the eeepc-laptop driver.

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Corentin Chary 2008-03-13 12:56:37 +01:00 committed by Len Brown
parent e59f87966a
commit a5fa429b4b
2 changed files with 78 additions and 0 deletions
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1
drivers/misc/Kconfig
View File

@ -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.

77
drivers/misc/eeepc-laptop.c
View File

@ -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;
}