[PATCH 2/2] rfkill: Create rfkill-none LED trigger

[João Paulo Rechi Vita]

Creates a new trigger rfkill-none, as a complement to rfkill-any, which
drives LEDs when any radio is enabled. The new trigger is meant to turn
a LED ON whenever all radios are OFF, and turn it OFF otherwise.

Signed-off-by: João Paulo Rechi Vita <jprv...@endlessm.com>
---
 net/rfkill/core.c | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/net/rfkill/core.c b/net/rfkill/core.c
index 6d64d14f4b0a..07235520b00f 100644
--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c
@@ -178,6 +178,7 @@ static void rfkill_led_trigger_unregister(struct rfkill 
*rfkill)
 }
 
 static struct led_trigger rfkill_any_led_trigger;
+static struct led_trigger rfkill_none_led_trigger;
 static struct work_struct rfkill_global_led_trigger_work;
 
 static void rfkill_global_led_trigger_worker(struct work_struct *work)
@@ -195,6 +196,8 @@ static void rfkill_global_led_trigger_worker(struct 
work_struct *work)
        mutex_unlock(&rfkill_global_mutex);
 
        led_trigger_event(&rfkill_any_led_trigger, brightness);
+       led_trigger_event(&rfkill_none_led_trigger, brightness == LED_OFF ?
+                                                       LED_FULL : LED_OFF);
 }
 
 static void rfkill_global_led_trigger_event(void)
@@ -202,22 +205,32 @@ static void rfkill_global_led_trigger_event(void)
        schedule_work(&rfkill_global_led_trigger_work);
 }
 
-static void rfkill_global_led_trigger_activate(struct led_classdev *led_cdev)
-{
-       rfkill_global_led_trigger_event();
-}
-
 static int rfkill_global_led_trigger_register(void)
 {
+       int ret;
+
        INIT_WORK(&rfkill_global_led_trigger_work,
                        rfkill_global_led_trigger_worker);
+
        rfkill_any_led_trigger.name = "rfkill-any";
-       rfkill_any_led_trigger.activate = rfkill_global_led_trigger_activate;
-       return led_trigger_register(&rfkill_any_led_trigger);
+       ret = led_trigger_register(&rfkill_any_led_trigger);
+       if (ret)
+               return ret;
+
+       rfkill_none_led_trigger.name = "rfkill-none";
+       ret = led_trigger_register(&rfkill_none_led_trigger);
+       if (ret)
+               led_trigger_unregister(&rfkill_any_led_trigger);
+       else
+               /* Delay activation until all global triggers are registered */
+               rfkill_global_led_trigger_event();
+
+       return ret;
 }
 
 static void rfkill_global_led_trigger_unregister(void)
 {
+       led_trigger_unregister(&rfkill_none_led_trigger);
        led_trigger_unregister(&rfkill_any_led_trigger);
        cancel_work_sync(&rfkill_global_led_trigger_work);
 }
-- 
2.17.0