From: Corentin Chary <corentincj@xxxxxxxxxx>
Add backlight class support to the eeepc-laptop driver.
Signed-off-by: Corentin Chary <corentincj@xxxxxxxxxx>
---
Kconfig | 1
eeepc-laptop.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 78 insertions(+)
--- a/drivers/misc/eeepc-laptop.c 2008-03-11 10:34:45.000000000 +0100
+++ b/drivers/misc/eeepc-laptop.c 2008-03-11 10:35:37.000000000 +0100
@@ -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 <asm/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 @@
},
};
+/* 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("Eric Cooper, Andrew Tipton, Corentin Chary");
MODULE_DESCRIPTION(EEEPC_HOTK_NAME);
MODULE_LICENSE("GPL");
@@ -211,6 +228,25 @@
}
/*
+ * 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_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 @@
/*
* 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 @@
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 @@
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_device1:
platform_driver_unregister(&platform_driver);
fail_platform_driver:
+ eeepc_backlight_exit();
+fail_backlight:
return result;
}
--- a/drivers/misc/Kconfig 2008-03-11 10:34:42.000000000 +0100
+++ b/drivers/misc/Kconfig 2008-03-11 18:35:23.000000000 +0100
@@ -236,6 +236,7 @@
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.
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