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Subject[PATCH 7/9] rfkill: Create "rfkill-airplane_mode" LED trigger
Date
This creates a new LED trigger to be used by platform drivers as a
default trigger for airplane-mode indicator LEDs.

By default this trigger will fire when RFKILL_OP_CHANGE_ALL is called
for all types (RFKILL_TYPE_ALL), setting the LED brightness to LED_FULL
when the changing the state to blocked, and to LED_OFF when the changing
the state to unblocked. In the future there will be a mechanism for
userspace to override the default policy, so it can implement its own.

This trigger will be used by the asus-wireless x86 platform driver.

Signed-off-by: João Paulo Rechi Vita <jprvita@endlessm.com>
---
Documentation/rfkill.txt | 2 ++
net/rfkill/core.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/Documentation/rfkill.txt b/Documentation/rfkill.txt
index 1f0c270..b13025a 100644
--- a/Documentation/rfkill.txt
+++ b/Documentation/rfkill.txt
@@ -85,6 +85,8 @@ device). Don't do this unless you cannot get the event in any other way.

RFKill provides per-switch LED triggers, which can be used to drive LEDs
according to the switch state (LED_FULL when blocked, LED_OFF otherwise).
+An airplane-mode indicator LED trigger is also available, which triggers
+LED_FULL when all radios known by RFKill are blocked, and LED_OFF otherwise.


5. Userspace support
diff --git a/net/rfkill/core.c b/net/rfkill/core.c
index 8b96869..fb11547 100644
--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c
@@ -126,6 +126,30 @@ static bool rfkill_epo_lock_active;


#ifdef CONFIG_RFKILL_LEDS
+static struct led_trigger rfkill_apm_led_trigger;
+
+static void rfkill_apm_led_trigger_event(bool state)
+{
+ led_trigger_event(&rfkill_apm_led_trigger, state ? LED_FULL : LED_OFF);
+}
+
+static void rfkill_apm_led_trigger_activate(struct led_classdev *led)
+{
+ rfkill_apm_led_trigger_event(!rfkill_default_state);
+}
+
+static int rfkill_apm_led_trigger_register(void)
+{
+ rfkill_apm_led_trigger.name = "rfkill-airplane_mode";
+ rfkill_apm_led_trigger.activate = rfkill_apm_led_trigger_activate;
+ return led_trigger_register(&rfkill_apm_led_trigger);
+}
+
+static void rfkill_apm_led_trigger_unregister(void)
+{
+ led_trigger_unregister(&rfkill_apm_led_trigger);
+}
+
static void rfkill_led_trigger_event(struct rfkill *rfkill)
{
struct led_trigger *trigger;
@@ -177,6 +201,19 @@ static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
led_trigger_unregister(&rfkill->led_trigger);
}
#else
+static void rfkill_apm_led_trigger_event(bool state)
+{
+}
+
+static int rfkill_apm_led_trigger_register(void)
+{
+ return 0;
+}
+
+static void rfkill_apm_led_trigger_unregister(void)
+{
+}
+
static void rfkill_led_trigger_event(struct rfkill *rfkill)
{
}
@@ -313,6 +350,7 @@ static void rfkill_update_global_state(enum rfkill_type type, bool blocked)

for (i = 0; i < NUM_RFKILL_TYPES; i++)
rfkill_global_states[i].cur = blocked;
+ rfkill_apm_led_trigger_event(blocked);
}

#ifdef CONFIG_RFKILL_INPUT
@@ -1260,15 +1298,22 @@ static int __init rfkill_init(void)
{
int error;

+ error = rfkill_apm_led_trigger_register();
+ if (error)
+ goto out;
+
rfkill_update_global_state(RFKILL_TYPE_ALL, !rfkill_default_state);

error = class_register(&rfkill_class);
- if (error)
+ if (error) {
+ rfkill_apm_led_trigger_unregister();
goto out;
+ }

error = misc_register(&rfkill_miscdev);
if (error) {
class_unregister(&rfkill_class);
+ rfkill_apm_led_trigger_unregister();
goto out;
}

@@ -1277,6 +1322,7 @@ static int __init rfkill_init(void)
if (error) {
misc_deregister(&rfkill_miscdev);
class_unregister(&rfkill_class);
+ rfkill_apm_led_trigger_unregister();
goto out;
}
#endif
@@ -1293,5 +1339,6 @@ static void __exit rfkill_exit(void)
#endif
misc_deregister(&rfkill_miscdev);
class_unregister(&rfkill_class);
+ rfkill_apm_led_trigger_unregister();
}
module_exit(rfkill_exit);
--
2.5.0
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