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| 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 | #include "leds.h" |
| 21 | |
| 22 | static ssize_t led_delay_on_show(struct device *dev, |
| 23 | struct device_attribute *attr, char *buf) |
| 24 | { |
| 25 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 26 | |
| 27 | return sprintf(buf, "%lu\n", led_cdev->blink_delay_on); |
| 28 | } |
| 29 | |
| 30 | static ssize_t led_delay_on_store(struct device *dev, |
| 31 | struct device_attribute *attr, const char *buf, size_t size) |
| 32 | { |
| 33 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 34 | unsigned long state; |
| 35 | ssize_t ret = -EINVAL; |
| 36 | |
| 37 | ret = kstrtoul(buf, 10, &state); |
| 38 | if (ret) |
| 39 | return ret; |
| 40 | |
| 41 | led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off); |
| 42 | led_cdev->blink_delay_on = state; |
| 43 | |
| 44 | return size; |
| 45 | } |
| 46 | |
| 47 | static ssize_t led_delay_off_show(struct device *dev, |
| 48 | struct device_attribute *attr, char *buf) |
| 49 | { |
| 50 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 51 | |
| 52 | return sprintf(buf, "%lu\n", led_cdev->blink_delay_off); |
| 53 | } |
| 54 | |
| 55 | static ssize_t led_delay_off_store(struct device *dev, |
| 56 | struct device_attribute *attr, const char *buf, size_t size) |
| 57 | { |
| 58 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
| 59 | unsigned long state; |
| 60 | ssize_t ret = -EINVAL; |
| 61 | |
| 62 | ret = kstrtoul(buf, 10, &state); |
| 63 | if (ret) |
| 64 | return ret; |
| 65 | |
| 66 | led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state); |
| 67 | led_cdev->blink_delay_off = state; |
| 68 | |
| 69 | return size; |
| 70 | } |
| 71 | |
| 72 | static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store); |
| 73 | static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store); |
| 74 | |
| 75 | static void timer_trig_activate(struct led_classdev *led_cdev) |
| 76 | { |
| 77 | int rc; |
| 78 | |
| 79 | led_cdev->trigger_data = NULL; |
| 80 | |
| 81 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_on); |
| 82 | if (rc) |
| 83 | return; |
| 84 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_off); |
| 85 | if (rc) |
| 86 | goto err_out_delayon; |
| 87 | |
| 88 | led_blink_set(led_cdev, &led_cdev->blink_delay_on, |
| 89 | &led_cdev->blink_delay_off); |
| 90 | led_cdev->activated = true; |
| 91 | |
| 92 | return; |
| 93 | |
| 94 | err_out_delayon: |
| 95 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
| 96 | } |
| 97 | |
| 98 | static void timer_trig_deactivate(struct led_classdev *led_cdev) |
| 99 | { |
| 100 | if (led_cdev->activated) { |
| 101 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
| 102 | device_remove_file(led_cdev->dev, &dev_attr_delay_off); |
| 103 | led_cdev->activated = false; |
| 104 | } |
| 105 | |
| 106 | /* Stop blinking */ |
| 107 | led_set_brightness(led_cdev, LED_OFF); |
| 108 | } |
| 109 | |
| 110 | static struct led_trigger timer_led_trigger = { |
| 111 | .name = "timer", |
| 112 | .activate = timer_trig_activate, |
| 113 | .deactivate = timer_trig_deactivate, |
| 114 | }; |
| 115 | |
| 116 | static int __init timer_trig_init(void) |
| 117 | { |
| 118 | return led_trigger_register(&timer_led_trigger); |
| 119 | } |
| 120 | |
| 121 | static void __exit timer_trig_exit(void) |
| 122 | { |
| 123 | led_trigger_unregister(&timer_led_trigger); |
| 124 | } |
| 125 | |
| 126 | module_init(timer_trig_init); |
| 127 | module_exit(timer_trig_exit); |
| 128 | |
| 129 | MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>"); |
| 130 | MODULE_DESCRIPTION("Timer LED trigger"); |
| 131 | MODULE_LICENSE("GPL"); |
| 132 |
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