platform/x86: samsung-laptop: Add support for Samsung's NP7[34]0U3E models.

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.

(Whitespace cleaned up by Matthew Garrett)

Signed-off-by: Scott Thrasher <scott.thrasher@gmail.com>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/drivers/platform/x86/samsung-laptop.c b/drivers/platform/x86/samsung-laptop.c
index d1f030053176..5a5966512277 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 +1426,19 @@ 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 +1559,15 @@ 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 +1642,9 @@ 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 +1670,7 @@ 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);