diff options
| -rw-r--r-- | drivers/misc/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/misc/eeepc-laptop.c | 77 |
2 files changed, 78 insertions, 0 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 2264127afac7..01b7deba91e8 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -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. diff --git a/drivers/misc/eeepc-laptop.c b/drivers/misc/eeepc-laptop.c index e34ff97530cd..2b59b7ed4b14 100644 --- a/drivers/misc/eeepc-laptop.c +++ b/drivers/misc/eeepc-laptop.c @@ -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"); @@ -211,6 +228,25 @@ static int get_acpi(int cm) } /* + * 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 */ static int parse_arg(const char *buf, unsigned long count, int *val) @@ -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 @@ fail_platform_device2: fail_platform_device1: platform_driver_unregister(&platform_driver); fail_platform_driver: + eeepc_backlight_exit(); +fail_backlight: return result; } |