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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.

This requires taking rfkill_global_mutex before calling rfkill_set_block()
in rfkill_resume(): since __rfkill_any_led_trigger_event() is called from
rfkill_set_block() unconditionally, each caller of the latter needs to
take care of locking rfkill_global_mutex.

Signed-off-by: Michał Kępień <kernel@kempniu.pl>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Michał Kępień 2016-12-08 08:30:52 +01:00 committed by Johannes Berg
parent 6124c53ede
commit 73f4f76a19
1 changed files with 73 additions and 0 deletions
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73
net/rfkill/core.c
View File

@ -176,6 +176,47 @@ static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
{
led_trigger_unregister(&rfkill->led_trigger);
}
static struct led_trigger rfkill_any_led_trigger;
static void __rfkill_any_led_trigger_event(void)
{
enum led_brightness brightness = LED_OFF;
struct rfkill *rfkill;
list_for_each_entry(rfkill, &rfkill_list, node) {
if (!(rfkill->state & RFKILL_BLOCK_ANY)) {
brightness = LED_FULL;
break;
}
}
led_trigger_event(&rfkill_any_led_trigger, brightness);
}
static void rfkill_any_led_trigger_event(void)
{
mutex_lock(&rfkill_global_mutex);
__rfkill_any_led_trigger_event();
mutex_unlock(&rfkill_global_mutex);
}
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)
{
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);
}
#else
static void rfkill_led_trigger_event(struct rfkill *rfkill)
{
@ -189,6 +230,23 @@ 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 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 +355,7 @@ 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 +536,7 @@ 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 +580,7 @@ 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 +630,7 @@ 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);
@ -812,8 +874,10 @@ static int rfkill_resume(struct device *dev)
rfkill->suspended = false;
if (!rfkill->persistent) {
mutex_lock(&rfkill_global_mutex);
cur = !!(rfkill->state & RFKILL_BLOCK_SW);
rfkill_set_block(rfkill, cur);
mutex_unlock(&rfkill_global_mutex);
}
if (rfkill->ops->poll && !rfkill->polling_paused)
@ -985,6 +1049,7 @@ 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 +1082,7 @@ 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 +1335,10 @@ 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)
@ -1278,6 +1348,8 @@ static int __init rfkill_init(void)
return 0;
error_input:
rfkill_any_led_trigger_unregister();
error_led_trigger:
misc_deregister(&rfkill_miscdev);
error_misc:
class_unregister(&rfkill_class);
@ -1291,6 +1363,7 @@ 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);
}