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192.168.1.100 / T800 / d94b99c34486b981a5475012c74c3daad9076ac8 / . / src / kernel / linux / v4.19 / drivers / leds / trigger / ledtrig-oneshot.c
blob: 95c9be4b6e7e7129aefcc047dcca0046a2ad3e21 [file] [log] [blame]
xjb04a4022021-11-25 15:01:52 +0800[diff] [blame]1/*
2 * One-shot LED Trigger
3 *
4 * Copyright 2012, Fabio Baltieri <fabio.baltieri@gmail.com>
5 *
6 * Based on ledtrig-timer.c by 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#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/device.h>
17#include <linux/ctype.h>
18#include <linux/slab.h>
19#include <linux/leds.h>
20#include "../leds.h"
21
22#define DEFAULT_DELAY 100
23
24struct oneshot_trig_data {
25 unsigned int invert;
26};
27
28static ssize_t led_shot(struct device *dev,
29 struct device_attribute *attr, const char *buf, size_t size)
30{
31 struct led_classdev *led_cdev = led_trigger_get_led(dev);
32 struct oneshot_trig_data *oneshot_data = led_trigger_get_drvdata(dev);
33
34 led_blink_set_oneshot(led_cdev,
35 &led_cdev->blink_delay_on, &led_cdev->blink_delay_off,
36 oneshot_data->invert);
37
38 /* content is ignored */
39 return size;
40}
41static ssize_t led_invert_show(struct device *dev,
42 struct device_attribute *attr, char *buf)
43{
44 struct oneshot_trig_data *oneshot_data = led_trigger_get_drvdata(dev);
45
46 return sprintf(buf, "%u\n", oneshot_data->invert);
47}
48
49static ssize_t led_invert_store(struct device *dev,
50 struct device_attribute *attr, const char *buf, size_t size)
51{
52 struct led_classdev *led_cdev = led_trigger_get_led(dev);
53 struct oneshot_trig_data *oneshot_data = led_trigger_get_drvdata(dev);
54 unsigned long state;
55 int ret;
56
57 ret = kstrtoul(buf, 0, &state);
58 if (ret)
59 return ret;
60
61 oneshot_data->invert = !!state;
62
63 if (oneshot_data->invert)
64 led_set_brightness_nosleep(led_cdev, LED_FULL);
65 else
66 led_set_brightness_nosleep(led_cdev, LED_OFF);
67
68 return size;
69}
70
71static ssize_t led_delay_on_show(struct device *dev,
72 struct device_attribute *attr, char *buf)
73{
74 struct led_classdev *led_cdev = led_trigger_get_led(dev);
75
76 return sprintf(buf, "%lu\n", led_cdev->blink_delay_on);
77}
78
79static ssize_t led_delay_on_store(struct device *dev,
80 struct device_attribute *attr, const char *buf, size_t size)
81{
82 struct led_classdev *led_cdev = led_trigger_get_led(dev);
83 unsigned long state;
84 int ret;
85
86 ret = kstrtoul(buf, 0, &state);
87 if (ret)
88 return ret;
89
90 led_cdev->blink_delay_on = state;
91
92 return size;
93}
94
95static ssize_t led_delay_off_show(struct device *dev,
96 struct device_attribute *attr, char *buf)
97{
98 struct led_classdev *led_cdev = led_trigger_get_led(dev);
99
100 return sprintf(buf, "%lu\n", led_cdev->blink_delay_off);
101}
102
103static ssize_t led_delay_off_store(struct device *dev,
104 struct device_attribute *attr, const char *buf, size_t size)
105{
106 struct led_classdev *led_cdev = led_trigger_get_led(dev);
107 unsigned long state;
108 int ret;
109
110 ret = kstrtoul(buf, 0, &state);
111 if (ret)
112 return ret;
113
114 led_cdev->blink_delay_off = state;
115
116 return size;
117}
118
119static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
120static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
121static DEVICE_ATTR(invert, 0644, led_invert_show, led_invert_store);
122static DEVICE_ATTR(shot, 0200, NULL, led_shot);
123
124static struct attribute *oneshot_trig_attrs[] = {
125 &dev_attr_delay_on.attr,
126 &dev_attr_delay_off.attr,
127 &dev_attr_invert.attr,
128 &dev_attr_shot.attr,
129 NULL
130};
131ATTRIBUTE_GROUPS(oneshot_trig);
132
133static int oneshot_trig_activate(struct led_classdev *led_cdev)
134{
135 struct oneshot_trig_data *oneshot_data;
136
137 oneshot_data = kzalloc(sizeof(*oneshot_data), GFP_KERNEL);
138 if (!oneshot_data)
139 return -ENOMEM;
140
141 led_set_trigger_data(led_cdev, oneshot_data);
142
143 led_cdev->blink_delay_on = DEFAULT_DELAY;
144 led_cdev->blink_delay_off = DEFAULT_DELAY;
145
146 return 0;
147}
148
149static void oneshot_trig_deactivate(struct led_classdev *led_cdev)
150{
151 struct oneshot_trig_data *oneshot_data = led_get_trigger_data(led_cdev);
152
153 kfree(oneshot_data);
154
155 /* Stop blinking */
156 led_set_brightness(led_cdev, LED_OFF);
157}
158
159static struct led_trigger oneshot_led_trigger = {
160 .name = "oneshot",
161 .activate = oneshot_trig_activate,
162 .deactivate = oneshot_trig_deactivate,
163 .groups = oneshot_trig_groups,
164};
165module_led_trigger(oneshot_led_trigger);
166
167MODULE_AUTHOR("Fabio Baltieri <fabio.baltieri@gmail.com>");
168MODULE_DESCRIPTION("One-shot LED trigger");
169MODULE_LICENSE("GPL v2");