asus-wmi: update wlan LED through rfkill led trigger

For those machines with wapf=4, BIOS won't update the wireless LED,
since wapf=4 means user application will take in chage of the wifi and bt.
So, we have to update wlan LED status explicitly.

But I found there is another wireless LED bug in launchpad and which is
not in the wapf=4 quirk.
So, it might be better to set wireless LED status explicitly for all
machines.

BugLink: https://launchpad.net/bugs/901105

Signed-off-by: AceLan Kao <acelan.kao@canonical.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

1 files changed, 76 insertions, 0 deletions

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index f80ae4d10f68..912ec7de71f4 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -187,6 +187,8 @@ struct asus_wmi {
         struct device *hwmon_device;
         struct platform_device *platform_device;
 
+        struct led_classdev wlan_led;
+        int wlan_led_wk;
         struct led_classdev tpd_led;
         int tpd_led_wk;
         struct led_classdev kbd_led;
@@ -194,6 +196,7 @@ struct asus_wmi {
         struct workqueue_struct *led_workqueue;
         struct work_struct tpd_led_work;
         struct work_struct kbd_led_work;
+        struct work_struct wlan_led_work;
 
         struct asus_rfkill wlan;
         struct asus_rfkill bluetooth;
@@ -456,12 +459,65 @@ static enum led_brightness kbd_led_get(struct led_classdev *led_cdev)
         return value;
 }
 
+static int wlan_led_unknown_state(struct asus_wmi *asus)
+{
+        u32 result;
+
+        asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_WIRELESS_LED, &result);
+
+        return result & ASUS_WMI_DSTS_UNKNOWN_BIT;
+}
+
+static int wlan_led_presence(struct asus_wmi *asus)
+{
+        u32 result;
+
+        asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_WIRELESS_LED, &result);
+
+        return result & ASUS_WMI_DSTS_PRESENCE_BIT;
+}
+
+static void wlan_led_update(struct work_struct *work)
+{
+        int ctrl_param;
+        struct asus_wmi *asus;
+
+        asus = container_of(work, struct asus_wmi, wlan_led_work);
+
+        ctrl_param = asus->wlan_led_wk;
+        asus_wmi_set_devstate(ASUS_WMI_DEVID_WIRELESS_LED, ctrl_param, NULL);
+}
+
+static void wlan_led_set(struct led_classdev *led_cdev,
+                         enum led_brightness value)
+{
+        struct asus_wmi *asus;
+
+        asus = container_of(led_cdev, struct asus_wmi, wlan_led);
+
+        asus->wlan_led_wk = !!value;
+        queue_work(asus->led_workqueue, &asus->wlan_led_work);
+}
+
+static enum led_brightness wlan_led_get(struct led_classdev *led_cdev)
+{
+        struct asus_wmi *asus;
+        u32 result;
+
+        asus = container_of(led_cdev, struct asus_wmi, wlan_led);
+        asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_WIRELESS_LED, &result);
+
+        return result & ASUS_WMI_DSTS_BRIGHTNESS_MASK;
+}
+
 static void asus_wmi_led_exit(struct asus_wmi *asus)
 {
         if (!IS_ERR_OR_NULL(asus->kbd_led.dev))
                 led_classdev_unregister(&asus->kbd_led);
         if (!IS_ERR_OR_NULL(asus->tpd_led.dev))
                 led_classdev_unregister(&asus->tpd_led);
+        if (!IS_ERR_OR_NULL(asus->wlan_led.dev))
+                led_classdev_unregister(&asus->wlan_led);
         if (asus->led_workqueue)
                 destroy_workqueue(asus->led_workqueue);
 }
@@ -498,6 +554,23 @@ static int asus_wmi_led_init(struct asus_wmi *asus)
 
                 rv = led_classdev_register(&asus->platform_device->dev,
                                            &asus->kbd_led);
+                if (rv)
+                        goto error;
+        }
+
+        if (wlan_led_presence(asus)) {
+                INIT_WORK(&asus->wlan_led_work, wlan_led_update);
+
+                asus->wlan_led.name = "asus::wlan";
+                asus->wlan_led.brightness_set = wlan_led_set;
+                if (!wlan_led_unknown_state(asus))
+                        asus->wlan_led.brightness_get = wlan_led_get;
+                asus->wlan_led.flags = LED_CORE_SUSPENDRESUME;
+                asus->wlan_led.max_brightness = 1;
+                asus->wlan_led.default_trigger = "asus-wlan";
+
+                rv = led_classdev_register(&asus->platform_device->dev,
+                                           &asus->wlan_led);
         }
 
 error:
@@ -813,6 +886,9 @@ static int asus_new_rfkill(struct asus_wmi *asus,
         if (!*rfkill)
                 return -EINVAL;
 
+        if (dev_id == ASUS_WMI_DEVID_WLAN)
+                rfkill_set_led_trigger_name(*rfkill, "asus-wlan");
+
         rfkill_init_sw_state(*rfkill, !result);
         result = rfkill_register(*rfkill);
         if (result) {