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rfkill: Add rfkill-any LED trigger 

Add a new "global" (i.e. not per-rfkill device) LED trigger, rfkill-any,
which may be useful on laptops with a single "radio LED" and multiple
radio transmitters.  The trigger is meant to turn a LED on whenever
there is at least one radio transmitter active and turn it off
otherwise.

Signed-off-by: Michał Kępień <kernel@kempniu.pl>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Michał Kępień 2017-01-06 07:07:47 +01:00 committed by Johannes Berg
parent e691ac2f75
commit 9b8e34e211
1 changed files with 71 additions and 1 deletions
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72
net/rfkill/core.c
View File

@ -176,6 +176,50 @@ static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
{
led_trigger_unregister(&rfkill->led_trigger);
}
static struct led_trigger rfkill_any_led_trigger;
static struct work_struct rfkill_any_work;
static void rfkill_any_led_trigger_worker(struct work_struct *work)
{
enum led_brightness brightness = LED_OFF;
struct rfkill *rfkill;
mutex_lock(&rfkill_global_mutex);
list_for_each_entry(rfkill, &rfkill_list, node) {
if (!(rfkill->state & RFKILL_BLOCK_ANY)) {
brightness = LED_FULL;
break;
}
}
mutex_unlock(&rfkill_global_mutex);
led_trigger_event(&rfkill_any_led_trigger, brightness);
}
static void rfkill_any_led_trigger_event(void)
{
schedule_work(&rfkill_any_work);
}
static void rfkill_any_led_trigger_activate(struct led_classdev *led_cdev)
{
rfkill_any_led_trigger_event();
}
static int rfkill_any_led_trigger_register(void)
{
INIT_WORK(&rfkill_any_work, rfkill_any_led_trigger_worker);
rfkill_any_led_trigger.name = "rfkill-any";
rfkill_any_led_trigger.activate = rfkill_any_led_trigger_activate;
return led_trigger_register(&rfkill_any_led_trigger);
}
static void rfkill_any_led_trigger_unregister(void)
{
led_trigger_unregister(&rfkill_any_led_trigger);
cancel_work_sync(&rfkill_any_work);
}
#else
static void rfkill_led_trigger_event(struct rfkill *rfkill)
{
@ -189,6 +233,19 @@ static inline int rfkill_led_trigger_register(struct rfkill *rfkill)
static inline void rfkill_led_trigger_unregister(struct rfkill *rfkill)
{
}
static void rfkill_any_led_trigger_event(void)
{
}
static int rfkill_any_led_trigger_register(void)
{
return 0;
}
static void rfkill_any_led_trigger_unregister(void)
{
}
#endif /* CONFIG_RFKILL_LEDS */
static void rfkill_fill_event(struct rfkill_event *ev, struct rfkill *rfkill,
@ -297,6 +354,7 @@ static void rfkill_set_block(struct rfkill *rfkill, bool blocked)
spin_unlock_irqrestore(&rfkill->lock, flags);
rfkill_led_trigger_event(rfkill);
rfkill_any_led_trigger_event();
if (prev != curr)
rfkill_event(rfkill);
@ -477,6 +535,7 @@ bool rfkill_set_hw_state(struct rfkill *rfkill, bool blocked)
spin_unlock_irqrestore(&rfkill->lock, flags);
rfkill_led_trigger_event(rfkill);
rfkill_any_led_trigger_event();
if (rfkill->registered && prev != blocked)
schedule_work(&rfkill->uevent_work);
@ -520,6 +579,7 @@ bool rfkill_set_sw_state(struct rfkill *rfkill, bool blocked)
schedule_work(&rfkill->uevent_work);
rfkill_led_trigger_event(rfkill);
rfkill_any_led_trigger_event();
return blocked;
}
@ -569,6 +629,7 @@ void rfkill_set_states(struct rfkill *rfkill, bool sw, bool hw)
schedule_work(&rfkill->uevent_work);
rfkill_led_trigger_event(rfkill);
rfkill_any_led_trigger_event();
}
}
EXPORT_SYMBOL(rfkill_set_states);
@ -985,6 +1046,7 @@ int __must_check rfkill_register(struct rfkill *rfkill)
#endif
}
rfkill_any_led_trigger_event();
rfkill_send_events(rfkill, RFKILL_OP_ADD);
mutex_unlock(&rfkill_global_mutex);
@ -1017,6 +1079,7 @@ void rfkill_unregister(struct rfkill *rfkill)
mutex_lock(&rfkill_global_mutex);
rfkill_send_events(rfkill, RFKILL_OP_DEL);
list_del_init(&rfkill->node);
rfkill_any_led_trigger_event();
mutex_unlock(&rfkill_global_mutex);
rfkill_led_trigger_unregister(rfkill);
@ -1269,6 +1332,10 @@ static int __init rfkill_init(void)
if (error)
goto error_misc;
error = rfkill_any_led_trigger_register();
if (error)
goto error_led_trigger;
#ifdef CONFIG_RFKILL_INPUT
error = rfkill_handler_init();
if (error)
@ -1279,8 +1346,10 @@ static int __init rfkill_init(void)
#ifdef CONFIG_RFKILL_INPUT
error_input:
misc_deregister(&rfkill_miscdev);
rfkill_any_led_trigger_unregister();
#endif
error_led_trigger:
misc_deregister(&rfkill_miscdev);
error_misc:
class_unregister(&rfkill_class);
error_class:
@ -1293,6 +1362,7 @@ static void __exit rfkill_exit(void)
#ifdef CONFIG_RFKILL_INPUT
rfkill_handler_exit();
#endif
rfkill_any_led_trigger_unregister();
misc_deregister(&rfkill_miscdev);
class_unregister(&rfkill_class);
}