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6655c6fe RP |
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 | ||
6655c6fe RP |
14 | #include <linux/module.h> |
15 | #include <linux/kernel.h> | |
16 | #include <linux/init.h> | |
6655c6fe | 17 | #include <linux/device.h> |
3dc7b82e | 18 | #include <linux/ctype.h> |
6655c6fe | 19 | #include <linux/leds.h> |
6655c6fe | 20 | |
4d404fd5 | 21 | static ssize_t led_delay_on_show(struct device *dev, |
f8a7c6fe | 22 | struct device_attribute *attr, char *buf) |
6655c6fe | 23 | { |
f8a7c6fe | 24 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
6655c6fe | 25 | |
5ada28bf | 26 | return sprintf(buf, "%lu\n", led_cdev->blink_delay_on); |
6655c6fe RP |
27 | } |
28 | ||
4d404fd5 | 29 | static ssize_t led_delay_on_store(struct device *dev, |
f8a7c6fe | 30 | struct device_attribute *attr, const char *buf, size_t size) |
6655c6fe | 31 | { |
f8a7c6fe | 32 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
872b86be SK |
33 | unsigned long state; |
34 | ssize_t ret = -EINVAL; | |
6655c6fe | 35 | |
872b86be SK |
36 | ret = kstrtoul(buf, 10, &state); |
37 | if (ret) | |
38 | return ret; | |
3dc7b82e | 39 | |
872b86be SK |
40 | led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off); |
41 | led_cdev->blink_delay_on = state; | |
6655c6fe | 42 | |
872b86be | 43 | return size; |
6655c6fe RP |
44 | } |
45 | ||
4d404fd5 | 46 | static ssize_t led_delay_off_show(struct device *dev, |
f8a7c6fe | 47 | struct device_attribute *attr, char *buf) |
6655c6fe | 48 | { |
f8a7c6fe | 49 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
6655c6fe | 50 | |
5ada28bf | 51 | return sprintf(buf, "%lu\n", led_cdev->blink_delay_off); |
6655c6fe RP |
52 | } |
53 | ||
4d404fd5 | 54 | static ssize_t led_delay_off_store(struct device *dev, |
f8a7c6fe | 55 | struct device_attribute *attr, const char *buf, size_t size) |
6655c6fe | 56 | { |
f8a7c6fe | 57 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
872b86be SK |
58 | unsigned long state; |
59 | ssize_t ret = -EINVAL; | |
3dc7b82e | 60 | |
872b86be SK |
61 | ret = kstrtoul(buf, 10, &state); |
62 | if (ret) | |
63 | return ret; | |
6655c6fe | 64 | |
872b86be SK |
65 | led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state); |
66 | led_cdev->blink_delay_off = state; | |
6655c6fe | 67 | |
872b86be | 68 | return size; |
6655c6fe RP |
69 | } |
70 | ||
f8a7c6fe RP |
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); | |
6655c6fe RP |
73 | |
74 | static void timer_trig_activate(struct led_classdev *led_cdev) | |
75 | { | |
12fda168 | 76 | int rc; |
6655c6fe | 77 | |
5ada28bf | 78 | led_cdev->trigger_data = NULL; |
6655c6fe | 79 | |
f8a7c6fe RP |
80 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_on); |
81 | if (rc) | |
5ada28bf | 82 | return; |
f8a7c6fe RP |
83 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_off); |
84 | if (rc) | |
85 | goto err_out_delayon; | |
12fda168 | 86 | |
fff26f81 EH |
87 | led_blink_set(led_cdev, &led_cdev->blink_delay_on, |
88 | &led_cdev->blink_delay_off); | |
13811879 | 89 | led_cdev->activated = true; |
6fa3eb70 | 90 | kobject_uevent(&led_cdev->dev->kobj,KOBJ_ADD); |
4c79141d | 91 | |
12fda168 JG |
92 | return; |
93 | ||
94 | err_out_delayon: | |
f8a7c6fe | 95 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
6655c6fe RP |
96 | } |
97 | ||
98 | static void timer_trig_deactivate(struct led_classdev *led_cdev) | |
99 | { | |
13811879 | 100 | if (led_cdev->activated) { |
f8a7c6fe RP |
101 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
102 | device_remove_file(led_cdev->dev, &dev_attr_delay_off); | |
13811879 | 103 | led_cdev->activated = false; |
6655c6fe | 104 | } |
ce70a245 | 105 | |
5ada28bf | 106 | /* Stop blinking */ |
19cd67e2 | 107 | led_set_brightness(led_cdev, LED_OFF); |
6655c6fe RP |
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"); |