asus-wmi: add keyboard backlight support

Based on a patch from Nate Weibley. <nweibley@gmail.com>.

Cc: Nate Weibley <nweibley@gmail.com>
Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index fa2b395145a63499ffe89b5c9044e07dcd12e6d8..83a7a8101fd6095b0f79a85baabf70f844e8e3d9 100644 (file)
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -66,6 +66,8 @@ MODULE_LICENSE("GPL");
 #define NOTIFY_BRNUP_MAX               0x1f
 #define NOTIFY_BRNDOWN_MIN             0x20
 #define NOTIFY_BRNDOWN_MAX             0x2e
+#define NOTIFY_KBD_BRTUP               0xc4
+#define NOTIFY_KBD_BRTDWN              0xc5
 
 /* WMI Methods */
 #define ASUS_WMI_METHODID_SPEC         0x43455053 /* BIOS SPECification */
@@ -174,8 +176,11 @@ struct asus_wmi {
 
        struct led_classdev tpd_led;
        int tpd_led_wk;
+       struct led_classdev kbd_led;
+       int kbd_led_wk;
        struct workqueue_struct *led_workqueue;
        struct work_struct tpd_led_work;
+       struct work_struct kbd_led_work;
 
        struct asus_rfkill wlan;
        struct asus_rfkill bluetooth;
@@ -360,30 +365,79 @@ static enum led_brightness tpd_led_get(struct led_classdev *led_cdev)
        return read_tpd_led_state(asus);
 }
 
-static int asus_wmi_led_init(struct asus_wmi *asus)
+static void kbd_led_update(struct work_struct *work)
 {
-       int rv;
+       int ctrl_param = 0;
+       struct asus_wmi *asus;
 
-       if (read_tpd_led_state(asus) < 0)
-               return 0;
+       asus = container_of(work, struct asus_wmi, kbd_led_work);
 
-       asus->led_workqueue = create_singlethread_workqueue("led_workqueue");
-       if (!asus->led_workqueue)
-               return -ENOMEM;
-       INIT_WORK(&asus->tpd_led_work, tpd_led_update);
+       /*
+        * bits 0-2: level
+        * bit 7: light on/off
+        */
+       if (asus->kbd_led_wk > 0)
+               ctrl_param = 0x80 | (asus->kbd_led_wk & 0x7F);
 
-       asus->tpd_led.name = "asus::touchpad";
-       asus->tpd_led.brightness_set = tpd_led_set;
-       asus->tpd_led.brightness_get = tpd_led_get;
-       asus->tpd_led.max_brightness = 1;
+       asus_wmi_set_devstate(ASUS_WMI_DEVID_KBD_BACKLIGHT, ctrl_param, NULL);
+}
 
-       rv = led_classdev_register(&asus->platform_device->dev, &asus->tpd_led);
-       if (rv) {
-               destroy_workqueue(asus->led_workqueue);
-               return rv;
+static int kbd_led_read(struct asus_wmi *asus, int *level, int *env)
+{
+       int retval;
+
+       /*
+        * bits 0-2: level
+        * bit 7: light on/off
+        * bit 8-10: environment (0: dark, 1: normal, 2: light)
+        * bit 17: status unknown
+        */
+       retval = asus_wmi_get_devstate_bits(asus, ASUS_WMI_DEVID_KBD_BACKLIGHT,
+                                           0xFFFF);
+
+       if (retval == 0x8000)
+               retval = -ENODEV;
+
+       if (retval >= 0) {
+               if (level)
+                       *level = retval & 0x80 ? retval & 0x7F : 0;
+               if (env)
+                       *env = (retval >> 8) & 0x7F;
+               retval = 0;
        }
 
-       return 0;
+       return retval;
+}
+
+static void kbd_led_set(struct led_classdev *led_cdev,
+                       enum led_brightness value)
+{
+       struct asus_wmi *asus;
+
+       asus = container_of(led_cdev, struct asus_wmi, kbd_led);
+
+       if (value > asus->kbd_led.max_brightness)
+               value = asus->kbd_led.max_brightness;
+       else if (value < 0)
+               value = 0;
+
+       asus->kbd_led_wk = value;
+       queue_work(asus->led_workqueue, &asus->kbd_led_work);
+}
+
+static enum led_brightness kbd_led_get(struct led_classdev *led_cdev)
+{
+       struct asus_wmi *asus;
+       int retval, value;
+
+       asus = container_of(led_cdev, struct asus_wmi, kbd_led);
+
+       retval = kbd_led_read(asus, &value, NULL);
+
+       if (retval < 0)
+               return retval;
+
+       return value;
 }
 
 static void asus_wmi_led_exit(struct asus_wmi *asus)
@@ -394,6 +448,48 @@ static void asus_wmi_led_exit(struct asus_wmi *asus)
                destroy_workqueue(asus->led_workqueue);
 }
 
+static int asus_wmi_led_init(struct asus_wmi *asus)
+{
+       int rv = 0;
+
+       asus->led_workqueue = create_singlethread_workqueue("led_workqueue");
+       if (!asus->led_workqueue)
+               return -ENOMEM;
+
+       if (read_tpd_led_state(asus) >= 0) {
+               INIT_WORK(&asus->tpd_led_work, tpd_led_update);
+
+               asus->tpd_led.name = "asus::touchpad";
+               asus->tpd_led.brightness_set = tpd_led_set;
+               asus->tpd_led.brightness_get = tpd_led_get;
+               asus->tpd_led.max_brightness = 1;
+
+               rv = led_classdev_register(&asus->platform_device->dev,
+                                          &asus->tpd_led);
+               if (rv)
+                       goto error;
+       }
+
+       if (kbd_led_read(asus, NULL, NULL) >= 0) {
+               INIT_WORK(&asus->kbd_led_work, kbd_led_update);
+
+               asus->kbd_led.name = "asus::kbd_backlight";
+               asus->kbd_led.brightness_set = kbd_led_set;
+               asus->kbd_led.brightness_get = kbd_led_get;
+               asus->kbd_led.max_brightness = 3;
+
+               rv = led_classdev_register(&asus->platform_device->dev,
+                                          &asus->kbd_led);
+       }
+
+error:
+       if (rv)
+               asus_wmi_led_exit(asus);
+
+       return rv;
+}
+
+
 /*
  * PCI hotplug (for wlan rfkill)
  */