diff options
Diffstat (limited to 'drivers/usb/common/led.c')
| -rw-r--r-- | drivers/usb/common/led.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/usb/common/led.c b/drivers/usb/common/led.c new file mode 100644 index 000000000000..df23da00a901 --- /dev/null +++ b/drivers/usb/common/led.c @@ -0,0 +1,57 @@ +/* + * LED Triggers for USB Activity + * + * Copyright 2014 Michal Sojka <sojka@merica.cz> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + */ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/leds.h> +#include <linux/usb.h> + +#define BLINK_DELAY 30 + +static unsigned long usb_blink_delay = BLINK_DELAY; + +DEFINE_LED_TRIGGER(ledtrig_usb_gadget); +DEFINE_LED_TRIGGER(ledtrig_usb_host); + +void usb_led_activity(enum usb_led_event ev) +{ + struct led_trigger *trig = NULL; + + switch (ev) { + case USB_LED_EVENT_GADGET: + trig = ledtrig_usb_gadget; + break; + case USB_LED_EVENT_HOST: + trig = ledtrig_usb_host; + break; + } + /* led_trigger_blink_oneshot() handles trig == NULL gracefully */ + led_trigger_blink_oneshot(trig, &usb_blink_delay, &usb_blink_delay, 0); +} +EXPORT_SYMBOL_GPL(usb_led_activity); + + +static int __init ledtrig_usb_init(void) +{ + led_trigger_register_simple("usb-gadget", &ledtrig_usb_gadget); + led_trigger_register_simple("usb-host", &ledtrig_usb_host); + return 0; +} + +static void __exit ledtrig_usb_exit(void) +{ + led_trigger_unregister_simple(ledtrig_usb_gadget); + led_trigger_unregister_simple(ledtrig_usb_host); +} + +module_init(ledtrig_usb_init); +module_exit(ledtrig_usb_exit); |