1 /* 2 * LED Kernel Timer Trigger 3 * 4 * Copyright 2005-2006 Openedhand Ltd. 5 * 6 * Author: Richard Purdie <rpurdie@openedhand.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 */ 13 14 #include <linux/module.h> 15 #include <linux/kernel.h> 16 #include <linux/init.h> 17 #include <linux/device.h> 18 #include <linux/ctype.h> 19 #include <linux/leds.h> 20 21 static ssize_t led_delay_on_show(struct device *dev, 22 struct device_attribute *attr, char *buf) 23 { 24 struct led_classdev *led_cdev = dev_get_drvdata(dev); 25 26 return sprintf(buf, "%lu\n", led_cdev->blink_delay_on); 27 } 28 29 static ssize_t led_delay_on_store(struct device *dev, 30 struct device_attribute *attr, const char *buf, size_t size) 31 { 32 struct led_classdev *led_cdev = dev_get_drvdata(dev); 33 unsigned long state; 34 ssize_t ret = -EINVAL; 35 36 ret = kstrtoul(buf, 10, &state); 37 if (ret) 38 return ret; 39 40 led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off); 41 led_cdev->blink_delay_on = state; 42 43 return size; 44 } 45 46 static ssize_t led_delay_off_show(struct device *dev, 47 struct device_attribute *attr, char *buf) 48 { 49 struct led_classdev *led_cdev = dev_get_drvdata(dev); 50 51 return sprintf(buf, "%lu\n", led_cdev->blink_delay_off); 52 } 53 54 static ssize_t led_delay_off_store(struct device *dev, 55 struct device_attribute *attr, const char *buf, size_t size) 56 { 57 struct led_classdev *led_cdev = dev_get_drvdata(dev); 58 unsigned long state; 59 ssize_t ret = -EINVAL; 60 61 ret = kstrtoul(buf, 10, &state); 62 if (ret) 63 return ret; 64 65 led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state); 66 led_cdev->blink_delay_off = state; 67 68 return size; 69 } 70 71 static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store); 72 static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store); 73 74 static void timer_trig_activate(struct led_classdev *led_cdev) 75 { 76 int rc; 77 78 led_cdev->trigger_data = NULL; 79 80 rc = device_create_file(led_cdev->dev, &dev_attr_delay_on); 81 if (rc) 82 return; 83 rc = device_create_file(led_cdev->dev, &dev_attr_delay_off); 84 if (rc) 85 goto err_out_delayon; 86 87 led_blink_set(led_cdev, &led_cdev->blink_delay_on, 88 &led_cdev->blink_delay_off); 89 led_cdev->activated = true; 90 91 return; 92 93 err_out_delayon: 94 device_remove_file(led_cdev->dev, &dev_attr_delay_on); 95 } 96 97 static void timer_trig_deactivate(struct led_classdev *led_cdev) 98 { 99 if (led_cdev->activated) { 100 device_remove_file(led_cdev->dev, &dev_attr_delay_on); 101 device_remove_file(led_cdev->dev, &dev_attr_delay_off); 102 led_cdev->activated = false; 103 } 104 105 /* Stop blinking */ 106 led_set_brightness(led_cdev, LED_OFF); 107 } 108 109 static struct led_trigger timer_led_trigger = { 110 .name = "timer", 111 .activate = timer_trig_activate, 112 .deactivate = timer_trig_deactivate, 113 }; 114 115 static int __init timer_trig_init(void) 116 { 117 return led_trigger_register(&timer_led_trigger); 118 } 119 120 static void __exit timer_trig_exit(void) 121 { 122 led_trigger_unregister(&timer_led_trigger); 123 } 124 125 module_init(timer_trig_init); 126 module_exit(timer_trig_exit); 127 128 MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>"); 129 MODULE_DESCRIPTION("Timer LED trigger"); 130 MODULE_LICENSE("GPL"); 131