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[RFKILL]: Add support for an rfkill LED.
This adds a LED trigger. Signed-off-by: Michael Buesch <mb@bu3sch.de> Acked-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -26,6 +26,7 @@
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/leds.h>
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/**
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* enum rfkill_type - type of rfkill switch.
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@ -56,6 +57,7 @@ enum rfkill_state {
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* @data: Pointer to the RF button drivers private data which will be
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* passed along when toggling radio state.
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* @toggle_radio(): Mandatory handler to control state of the radio.
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* @led_trigger: A LED trigger for this button's LED.
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* @dev: Device structure integrating the switch into device tree.
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* @node: Used to place switch into list of all switches known to the
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* the system.
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@ -74,6 +76,10 @@ struct rfkill {
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void *data;
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int (*toggle_radio)(void *data, enum rfkill_state state);
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#ifdef CONFIG_RFKILL_LEDS
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struct led_trigger led_trigger;
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#endif
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struct device dev;
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struct list_head node;
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};
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@ -84,4 +90,19 @@ void rfkill_free(struct rfkill *rfkill);
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int rfkill_register(struct rfkill *rfkill);
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void rfkill_unregister(struct rfkill *rfkill);
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/**
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* rfkill_get_led_name - Get the LED trigger name for the button's LED.
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* This function might return a NULL pointer if registering of the
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* LED trigger failed.
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* Use this as "default_trigger" for the LED.
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*/
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static inline char *rfkill_get_led_name(struct rfkill *rfkill)
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{
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#ifdef CONFIG_RFKILL_LEDS
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return (char *)(rfkill->led_trigger.name);
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#else
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return NULL;
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#endif
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}
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#endif /* RFKILL_H */
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@ -22,3 +22,10 @@ config RFKILL_INPUT
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To compile this driver as a module, choose M here: the
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module will be called rfkill-input.
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# LED trigger support
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config RFKILL_LEDS
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bool
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depends on RFKILL && LEDS_TRIGGERS
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default y
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@ -37,6 +37,22 @@ static DEFINE_MUTEX(rfkill_mutex);
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static enum rfkill_state rfkill_states[RFKILL_TYPE_MAX];
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static void rfkill_led_trigger(struct rfkill *rfkill,
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enum rfkill_state state)
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{
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#ifdef CONFIG_RFKILL_LEDS
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struct led_trigger *led = &rfkill->led_trigger;
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if (!led->name)
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return;
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if (state == RFKILL_STATE_OFF)
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led_trigger_event(led, LED_OFF);
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else
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led_trigger_event(led, LED_FULL);
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#endif /* CONFIG_RFKILL_LEDS */
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}
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static int rfkill_toggle_radio(struct rfkill *rfkill,
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enum rfkill_state state)
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{
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@ -48,8 +64,10 @@ static int rfkill_toggle_radio(struct rfkill *rfkill,
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if (state != rfkill->state) {
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retval = rfkill->toggle_radio(rfkill->data, state);
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if (!retval)
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if (!retval) {
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rfkill->state = state;
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rfkill_led_trigger(rfkill, state);
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}
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}
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mutex_unlock(&rfkill->mutex);
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@ -328,6 +346,26 @@ void rfkill_free(struct rfkill *rfkill)
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}
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EXPORT_SYMBOL(rfkill_free);
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static void rfkill_led_trigger_register(struct rfkill *rfkill)
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{
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#ifdef CONFIG_RFKILL_LEDS
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int error;
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rfkill->led_trigger.name = rfkill->dev.bus_id;
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error = led_trigger_register(&rfkill->led_trigger);
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if (error)
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rfkill->led_trigger.name = NULL;
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#endif /* CONFIG_RFKILL_LEDS */
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}
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static void rfkill_led_trigger_unregister(struct rfkill *rfkill)
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{
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#ifdef CONFIG_RFKILL_LEDS
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if (rfkill->led_trigger.name)
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led_trigger_unregister(&rfkill->led_trigger);
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#endif
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}
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/**
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* rfkill_register - Register a rfkill structure.
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* @rfkill: rfkill structure to be registered
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@ -357,6 +395,7 @@ int rfkill_register(struct rfkill *rfkill)
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rfkill_remove_switch(rfkill);
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return error;
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}
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rfkill_led_trigger_register(rfkill);
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return 0;
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}
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@ -372,6 +411,7 @@ EXPORT_SYMBOL(rfkill_register);
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*/
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void rfkill_unregister(struct rfkill *rfkill)
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{
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rfkill_led_trigger_unregister(rfkill);
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device_del(&rfkill->dev);
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rfkill_remove_switch(rfkill);
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put_device(&rfkill->dev);
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