platform/x86: asus-wmi: Add lightbar led support

Some Asus laptops (ROG series for example) are provided with a lightbar
behind the monitor. This patch make possible to switch it on and off.
This lightbar works exactly like any other led.

Signed-off-by: Maxime Bellengé <maxime.bellenge@gmail.com>
[dvhart: fix commit message format and variable declaration order]
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 48e1541dc8d4efa3cf24e9c0df5861aeaa431798..a32c5c00e0e7bdf9868e81c655f30f8fb6cc34be 100644 (file)
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -119,6 +119,7 @@ MODULE_LICENSE("GPL");
 #define ASUS_WMI_DEVID_BRIGHTNESS      0x00050012
 #define ASUS_WMI_DEVID_KBD_BACKLIGHT   0x00050021
 #define ASUS_WMI_DEVID_LIGHT_SENSOR    0x00050022 /* ?? */
+#define ASUS_WMI_DEVID_LIGHTBAR                0x00050025
 
 /* Misc */
 #define ASUS_WMI_DEVID_CAMERA          0x00060013
@@ -148,6 +149,7 @@ MODULE_LICENSE("GPL");
 #define ASUS_WMI_DSTS_BIOS_BIT         0x00040000
 #define ASUS_WMI_DSTS_BRIGHTNESS_MASK  0x000000FF
 #define ASUS_WMI_DSTS_MAX_BRIGTH_MASK  0x0000FF00
+#define ASUS_WMI_DSTS_LIGHTBAR_MASK    0x0000000F
 
 #define ASUS_FAN_DESC                  "cpu_fan"
 #define ASUS_FAN_MFUN                  0x13
@@ -222,10 +224,13 @@ struct asus_wmi {
        int tpd_led_wk;
        struct led_classdev kbd_led;
        int kbd_led_wk;
+       struct led_classdev lightbar_led;
+       int lightbar_led_wk;
        struct workqueue_struct *led_workqueue;
        struct work_struct tpd_led_work;
        struct work_struct kbd_led_work;
        struct work_struct wlan_led_work;
+       struct work_struct lightbar_led_work;
 
        struct asus_rfkill wlan;
        struct asus_rfkill bluetooth;
@@ -567,6 +572,48 @@ static enum led_brightness wlan_led_get(struct led_classdev *led_cdev)
        return result & ASUS_WMI_DSTS_BRIGHTNESS_MASK;
 }
 
+static void lightbar_led_update(struct work_struct *work)
+{
+       struct asus_wmi *asus;
+       int ctrl_param;
+
+       asus = container_of(work, struct asus_wmi, lightbar_led_work);
+
+       ctrl_param = asus->lightbar_led_wk;
+       asus_wmi_set_devstate(ASUS_WMI_DEVID_LIGHTBAR, ctrl_param, NULL);
+}
+
+static void lightbar_led_set(struct led_classdev *led_cdev,
+                            enum led_brightness value)
+{
+       struct asus_wmi *asus;
+
+       asus = container_of(led_cdev, struct asus_wmi, lightbar_led);
+
+       asus->lightbar_led_wk = !!value;
+       queue_work(asus->led_workqueue, &asus->lightbar_led_work);
+}
+
+static enum led_brightness lightbar_led_get(struct led_classdev *led_cdev)
+{
+       struct asus_wmi *asus;
+       u32 result;
+
+       asus = container_of(led_cdev, struct asus_wmi, lightbar_led);
+       asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_LIGHTBAR, &result);
+
+       return result & ASUS_WMI_DSTS_LIGHTBAR_MASK;
+}
+
+static int lightbar_led_presence(struct asus_wmi *asus)
+{
+       u32 result;
+
+       asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_LIGHTBAR, &result);
+
+       return result & ASUS_WMI_DSTS_PRESENCE_BIT;
+}
+
 static void asus_wmi_led_exit(struct asus_wmi *asus)
 {
        if (!IS_ERR_OR_NULL(asus->kbd_led.dev))
@@ -575,6 +622,8 @@ static void asus_wmi_led_exit(struct asus_wmi *asus)
                led_classdev_unregister(&asus->tpd_led);
        if (!IS_ERR_OR_NULL(asus->wlan_led.dev))
                led_classdev_unregister(&asus->wlan_led);
+       if (!IS_ERR_OR_NULL(asus->lightbar_led.dev))
+               led_classdev_unregister(&asus->lightbar_led);
        if (asus->led_workqueue)
                destroy_workqueue(asus->led_workqueue);
 }
@@ -630,6 +679,20 @@ static int asus_wmi_led_init(struct asus_wmi *asus)
 
                rv = led_classdev_register(&asus->platform_device->dev,
                                           &asus->wlan_led);
+               if (rv)
+                       goto error;
+       }
+
+       if (lightbar_led_presence(asus)) {
+               INIT_WORK(&asus->lightbar_led_work, lightbar_led_update);
+
+               asus->lightbar_led.name = "asus::lightbar";
+               asus->lightbar_led.brightness_set = lightbar_led_set;
+               asus->lightbar_led.brightness_get = lightbar_led_get;
+               asus->lightbar_led.max_brightness = 1;
+
+               rv = led_classdev_register(&asus->platform_device->dev,
+                                          &asus->lightbar_led);
        }
 
 error: