diff options
Diffstat (limited to 'drivers/leds')
| -rw-r--r-- | drivers/leds/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/leds/Makefile | 3 | ||||
| -rw-r--r-- | drivers/leds/ledtrig-timer.c | 170 |
3 files changed, 180 insertions, 0 deletions
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index a4d12ecaf6a..fda44df5921 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -22,5 +22,12 @@ config LEDS_TRIGGERS These triggers allow kernel events to drive the LEDs and can be configured via sysfs. If unsure, say Y. +config LEDS_TRIGGER_TIMER + tristate "LED Timer Trigger" + depends LEDS_TRIGGERS + help + This allows LEDs to be controlled by a programmable timer + via sysfs. If unsure, say Y. + endmenu diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index a9d8becd618..81e4abb9dcb 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -3,3 +3,6 @@ obj-$(CONFIG_NEW_LEDS) += led-core.o obj-$(CONFIG_LEDS_CLASS) += led-class.o obj-$(CONFIG_LEDS_TRIGGERS) += led-triggers.o + +# LED Triggers +obj-$(CONFIG_LEDS_TRIGGER_TIMER) += ledtrig-timer.o diff --git a/drivers/leds/ledtrig-timer.c b/drivers/leds/ledtrig-timer.c new file mode 100644 index 00000000000..f484b5d6dbf --- /dev/null +++ b/drivers/leds/ledtrig-timer.c @@ -0,0 +1,170 @@ +/* + * LED Kernel Timer Trigger + * + * Copyright 2005-2006 Openedhand Ltd. + * + * Author: Richard Purdie <rpurdie@openedhand.com> + * + * 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/config.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/spinlock.h> +#include <linux/device.h> +#include <linux/sysdev.h> +#include <linux/timer.h> +#include <linux/leds.h> +#include "leds.h" + +struct timer_trig_data { + unsigned long delay_on; /* milliseconds on */ + unsigned long delay_off; /* milliseconds off */ + struct timer_list timer; +}; + +static void led_timer_function(unsigned long data) +{ + struct led_classdev *led_cdev = (struct led_classdev *) data; + struct timer_trig_data *timer_data = led_cdev->trigger_data; + unsigned long brightness = LED_OFF; + unsigned long delay = timer_data->delay_off; + + if (!timer_data->delay_on || !timer_data->delay_off) { + led_set_brightness(led_cdev, LED_OFF); + return; + } + + if (!led_cdev->brightness) { + brightness = LED_FULL; + delay = timer_data->delay_on; + } + + led_set_brightness(led_cdev, brightness); + + mod_timer(&timer_data->timer, jiffies + msecs_to_jiffies(delay)); +} + +static ssize_t led_delay_on_show(struct class_device *dev, char *buf) +{ + struct led_classdev *led_cdev = class_get_devdata(dev); + struct timer_trig_data *timer_data = led_cdev->trigger_data; + + sprintf(buf, "%lu\n", timer_data->delay_on); + + return strlen(buf) + 1; +} + +static ssize_t led_delay_on_store(struct class_device *dev, const char *buf, + size_t size) +{ + struct led_classdev *led_cdev = class_get_devdata(dev); + struct timer_trig_data *timer_data = led_cdev->trigger_data; + int ret = -EINVAL; + char *after; + unsigned long state = simple_strtoul(buf, &after, 10); + + if (after - buf > 0) { + timer_data->delay_on = state; + mod_timer(&timer_data->timer, jiffies + 1); + ret = after - buf; + } + + return ret; +} + +static ssize_t led_delay_off_show(struct class_device *dev, char *buf) +{ + struct led_classdev *led_cdev = class_get_devdata(dev); + struct timer_trig_data *timer_data = led_cdev->trigger_data; + + sprintf(buf, "%lu\n", timer_data->delay_off); + + return strlen(buf) + 1; +} + +static ssize_t led_delay_off_store(struct class_device *dev, const char *buf, + size_t size) +{ + struct led_classdev *led_cdev = class_get_devdata(dev); + struct timer_trig_data *timer_data = led_cdev->trigger_data; + int ret = -EINVAL; + char *after; + unsigned long state = simple_strtoul(buf, &after, 10); + + if (after - buf > 0) { + timer_data->delay_off = state; + mod_timer(&timer_data->timer, jiffies + 1); + ret = after - buf; + } + + return ret; +} + +static CLASS_DEVICE_ATTR(delay_on, 0644, led_delay_on_show, + led_delay_on_store); +static CLASS_DEVICE_ATTR(delay_off, 0644, led_delay_off_show, + led_delay_off_store); + +static void timer_trig_activate(struct led_classdev *led_cdev) +{ + struct timer_trig_data *timer_data; + + timer_data = kzalloc(sizeof(struct timer_trig_data), GFP_KERNEL); + if (!timer_data) + return; + + led_cdev->trigger_data = timer_data; + + init_timer(&timer_data->timer); + timer_data->timer.function = led_timer_function; + timer_data->timer.data = (unsigned long) led_cdev; + + class_device_create_file(led_cdev->class_dev, + &class_device_attr_delay_on); + class_device_create_file(led_cdev->class_dev, + &class_device_attr_delay_off); +} + +static void timer_trig_deactivate(struct led_classdev *led_cdev) +{ + struct timer_trig_data *timer_data = led_cdev->trigger_data; + + if (timer_data) { + class_device_remove_file(led_cdev->class_dev, + &class_device_attr_delay_on); + class_device_remove_file(led_cdev->class_dev, + &class_device_attr_delay_off); + del_timer_sync(&timer_data->timer); + kfree(timer_data); + } +} + +static struct led_trigger timer_led_trigger = { + .name = "timer", + .activate = timer_trig_activate, + .deactivate = timer_trig_deactivate, +}; + +static int __init timer_trig_init(void) +{ + return led_trigger_register(&timer_led_trigger); +} + +static void __exit timer_trig_exit(void) +{ + led_trigger_unregister(&timer_led_trigger); +} + +module_init(timer_trig_init); +module_exit(timer_trig_exit); + +MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>"); +MODULE_DESCRIPTION("Timer LED trigger"); +MODULE_LICENSE("GPL"); |