| /* |
| * 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/module.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/device.h> |
| #include <linux/ctype.h> |
| #include <linux/leds.h> |
| |
| static ssize_t led_delay_on_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| |
| return sprintf(buf, "%lu\n", led_cdev->blink_delay_on); |
| } |
| |
| static ssize_t led_delay_on_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t size) |
| { |
| struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| unsigned long state; |
| ssize_t ret = -EINVAL; |
| |
| ret = kstrtoul(buf, 10, &state); |
| if (ret) |
| return ret; |
| |
| led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off); |
| led_cdev->blink_delay_on = state; |
| |
| return size; |
| } |
| |
| static ssize_t led_delay_off_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| |
| return sprintf(buf, "%lu\n", led_cdev->blink_delay_off); |
| } |
| |
| static ssize_t led_delay_off_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t size) |
| { |
| struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| unsigned long state; |
| ssize_t ret = -EINVAL; |
| |
| ret = kstrtoul(buf, 10, &state); |
| if (ret) |
| return ret; |
| |
| led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state); |
| led_cdev->blink_delay_off = state; |
| |
| return size; |
| } |
| |
| static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store); |
| static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store); |
| |
| static void timer_trig_activate(struct led_classdev *led_cdev) |
| { |
| int rc; |
| |
| led_cdev->trigger_data = NULL; |
| |
| rc = device_create_file(led_cdev->dev, &dev_attr_delay_on); |
| if (rc) |
| return; |
| rc = device_create_file(led_cdev->dev, &dev_attr_delay_off); |
| if (rc) |
| goto err_out_delayon; |
| |
| led_blink_set(led_cdev, &led_cdev->blink_delay_on, |
| &led_cdev->blink_delay_off); |
| led_cdev->activated = true; |
| |
| return; |
| |
| err_out_delayon: |
| device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
| } |
| |
| static void timer_trig_deactivate(struct led_classdev *led_cdev) |
| { |
| if (led_cdev->activated) { |
| device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
| device_remove_file(led_cdev->dev, &dev_attr_delay_off); |
| led_cdev->activated = false; |
| } |
| |
| /* Stop blinking */ |
| led_set_brightness(led_cdev, LED_OFF); |
| } |
| |
| 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 v2"); |