From: Scott Thrasher <[email protected]>
These models have only 4 levels of keyboard backlight brightness and forget
how to work the backlight after resuming from S3 sleep. I've added a quirk
to set the appropriate number of backlight levels, and one to re-enable the
keyboard backlight on resume.
Signed-of-by: Scott Thrasher <[email protected]>
---
drivers/platform/x86/samsung-laptop.c | 37 +++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/drivers/platform/x86/samsung-laptop.c
b/drivers/platform/x86/samsung-laptop.c
index d1f03005..37f0106 100644
--- a/drivers/platform/x86/samsung-laptop.c
+++ b/drivers/platform/x86/samsung-laptop.c
@@ -27,6 +27,7 @@
#include <linux/debugfs.h>
#include <linux/ctype.h>
#include <linux/efi.h>
+#include <linux/suspend.h>
#include <acpi/video.h>
/*
@@ -340,6 +341,8 @@ struct samsung_laptop {
struct samsung_laptop_debug debug;
struct samsung_quirks *quirks;
+ struct notifier_block pm_nb;
+
bool handle_backlight;
bool has_stepping_quirk;
@@ -348,6 +351,8 @@ struct samsung_laptop {
struct samsung_quirks {
bool broken_acpi_video;
+ bool four_kbd_backlight_levels;
+ bool enable_kbd_backlight;
};
static struct samsung_quirks samsung_unknown = {};
@@ -356,6 +361,11 @@ static struct samsung_quirks samsung_broken_acpi_video = {
.broken_acpi_video = true,
};
+static struct samsung_quirks samsung_np740u3e = {
+ .four_kbd_backlight_levels = true,
+ .enable_kbd_backlight = true,
+};
+
static bool force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force,
@@ -1051,6 +1061,8 @@ static int __init samsung_leds_init(struct samsung_laptop
*samsung)
samsung->kbd_led.brightness_set = kbd_led_set;
samsung->kbd_led.brightness_get = kbd_led_get;
samsung->kbd_led.max_brightness = 8;
+ if(samsung->quirks->four_kbd_backlight_levels)
+ samsung->kbd_led.max_brightness = 4;
ret = led_classdev_register(&samsung->platform_device->dev,
&samsung->kbd_led);
@@ -1414,6 +1426,18 @@ static void samsung_platform_exit(struct samsung_laptop
*samsung)
}
}
+static int samsung_pm_notification(struct notifier_block *nb, unsigned long
val,
+ void *ptr)
+{
+ struct samsung_laptop *samsung;
+ samsung = container_of(nb, struct samsung_laptop, pm_nb);
+
+ if (val == PM_POST_HIBERNATION &&
samsung->quirks->enable_kbd_backlight)
+ kbd_backlight_enable(samsung);
+
+ return 0;
+}
+
static int __init samsung_platform_init(struct samsung_laptop *samsung)
{
struct platform_device *pdev;
@@ -1534,6 +1558,15 @@ static struct dmi_system_id __initdata
samsung_dmi_table[] = {
},
.driver_data = &samsung_broken_acpi_video,
},
+ {
+ .callback = samsung_dmi_matched,
+ .ident = "730U3E/740U3E",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
+ DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
+ },
+ .driver_data = &samsung_np740u3e,
+ },
{ },
};
MODULE_DEVICE_TABLE(dmi, samsung_dmi_table);
@@ -1608,6 +1641,9 @@ static int __init samsung_init(void)
if (ret)
goto error_debugfs;
+ samsung->pm_nb.notifier_call = samsung_pm_notification;
+ register_pm_notifier(&samsung->pm_nb);
+
samsung_platform_device = samsung->platform_device;
return ret;
@@ -1633,6 +1669,7 @@ static void __exit samsung_exit(void)
struct samsung_laptop *samsung;
samsung = platform_get_drvdata(samsung_platform_device);
+ unregister_pm_notifier(&samsung->pm_nb);
samsung_debugfs_exit(samsung);
samsung_leds_exit(samsung);
--
1.9.1
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