eeepc-laptop: add backlight
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>
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2 changed files with 78 additions and 0 deletions
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@ -355,6 +355,7 @@ config EEEPC_LAPTOP
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tristate "Eee PC Hotkey Driver (EXPERIMENTAL)"
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depends on X86
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depends on ACPI
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depends on BACKLIGHT_CLASS_DEVICE
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depends on EXPERIMENTAL
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---help---
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This driver supports the Fn-Fx keys on Eee PC laptops.
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@ -21,6 +21,8 @@
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/platform_device.h>
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#include <linux/backlight.h>
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#include <linux/fb.h>
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#include <acpi/acpi_drivers.h>
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#include <acpi/acpi_bus.h>
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#include <linux/uaccess.h>
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@ -43,6 +45,8 @@
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* Definitions for Asus EeePC
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*/
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#define NOTIFY_WLAN_ON 0x10
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#define NOTIFY_BRN_MIN 0x20
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#define NOTIFY_BRN_MAX 0x2f
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enum {
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DISABLE_ASL_WLAN = 0x0001,
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@ -147,6 +151,19 @@ static struct acpi_driver eeepc_hotk_driver = {
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},
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};
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/* The backlight device /sys/class/backlight */
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static struct backlight_device *eeepc_backlight_device;
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/*
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* The backlight class declaration
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*/
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static int read_brightness(struct backlight_device *bd);
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static int update_bl_status(struct backlight_device *bd);
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static struct backlight_ops eeepcbl_ops = {
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.get_brightness = read_brightness,
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.update_status = update_bl_status,
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};
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MODULE_AUTHOR("Corentin Chary, Eric Cooper");
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MODULE_DESCRIPTION(EEEPC_HOTK_NAME);
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MODULE_LICENSE("GPL");
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@ -210,6 +227,25 @@ static int get_acpi(int cm)
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return value;
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}
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/*
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* Backlight
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*/
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static int read_brightness(struct backlight_device *bd)
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{
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return get_acpi(CM_ASL_PANELBRIGHT);
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}
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static int set_brightness(struct backlight_device *bd, int value)
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{
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value = max(0, min(15, value));
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return set_acpi(CM_ASL_PANELBRIGHT, value);
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}
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static int update_bl_status(struct backlight_device *bd)
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{
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return set_brightness(bd, bd->props.brightness);
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}
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/*
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* Sys helpers
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*/
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@ -328,12 +364,20 @@ static void notify_wlan(u32 *event)
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}
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}
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static void notify_brn(void)
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{
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struct backlight_device *bd = eeepc_backlight_device;
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bd->props.brightness = read_brightness(bd);
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}
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static void eeepc_hotk_notify(acpi_handle handle, u32 event, void *data)
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{
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if (!ehotk)
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return;
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if (event == NOTIFY_WLAN_ON && (DISABLE_ASL_WLAN & ehotk->init_flag))
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notify_wlan(&event);
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if (event >= NOTIFY_BRN_MIN && event <= NOTIFY_BRN_MAX)
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notify_brn();
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acpi_bus_generate_proc_event(ehotk->device, event,
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ehotk->event_count[event % 128]++);
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}
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@ -387,8 +431,16 @@ static int eeepc_hotk_remove(struct acpi_device *device, int type)
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/*
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* exit/init
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*/
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static void eeepc_backlight_exit(void)
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{
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if (eeepc_backlight_device)
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backlight_device_unregister(eeepc_backlight_device);
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eeepc_backlight_device = NULL;
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}
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static void __exit eeepc_laptop_exit(void)
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{
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eeepc_backlight_exit();
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acpi_bus_unregister_driver(&eeepc_hotk_driver);
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sysfs_remove_group(&platform_device->dev.kobj,
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&platform_attribute_group);
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@ -396,6 +448,26 @@ static void __exit eeepc_laptop_exit(void)
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platform_driver_unregister(&platform_driver);
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}
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static int eeepc_backlight_init(struct device *dev)
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{
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struct backlight_device *bd;
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bd = backlight_device_register(EEEPC_HOTK_FILE, dev,
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NULL, &eeepcbl_ops);
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if (IS_ERR(bd)) {
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printk(EEEPC_ERR
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"Could not register eeepc backlight device\n");
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eeepc_backlight_device = NULL;
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return PTR_ERR(bd);
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}
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eeepc_backlight_device = bd;
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bd->props.max_brightness = 15;
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bd->props.brightness = read_brightness(NULL);
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bd->props.power = FB_BLANK_UNBLANK;
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backlight_update_status(bd);
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return 0;
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}
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static int __init eeepc_laptop_init(void)
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{
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struct device *dev;
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@ -411,6 +483,9 @@ static int __init eeepc_laptop_init(void)
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return -ENODEV;
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}
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dev = acpi_get_physical_device(ehotk->device->handle);
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result = eeepc_backlight_init(dev);
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if (result)
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goto fail_backlight;
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/* Register platform stuff */
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result = platform_driver_register(&platform_driver);
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if (result)
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@ -435,6 +510,8 @@ fail_platform_device2:
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fail_platform_device1:
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platform_driver_unregister(&platform_driver);
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fail_platform_driver:
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eeepc_backlight_exit();
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fail_backlight:
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return result;
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}
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