This source file includes following definitions.
- transient_timer_function
- transient_activate_show
- transient_activate_store
- transient_duration_show
- transient_duration_store
- transient_state_show
- transient_state_store
- transient_trig_activate
- transient_trig_deactivate
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14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/device.h>
18 #include <linux/slab.h>
19 #include <linux/timer.h>
20 #include <linux/leds.h>
21 #include "../leds.h"
22
23 struct transient_trig_data {
24 int activate;
25 int state;
26 int restore_state;
27 unsigned long duration;
28 struct timer_list timer;
29 struct led_classdev *led_cdev;
30 };
31
32 static void transient_timer_function(struct timer_list *t)
33 {
34 struct transient_trig_data *transient_data =
35 from_timer(transient_data, t, timer);
36 struct led_classdev *led_cdev = transient_data->led_cdev;
37
38 transient_data->activate = 0;
39 led_set_brightness_nosleep(led_cdev, transient_data->restore_state);
40 }
41
42 static ssize_t transient_activate_show(struct device *dev,
43 struct device_attribute *attr, char *buf)
44 {
45 struct transient_trig_data *transient_data =
46 led_trigger_get_drvdata(dev);
47
48 return sprintf(buf, "%d\n", transient_data->activate);
49 }
50
51 static ssize_t transient_activate_store(struct device *dev,
52 struct device_attribute *attr, const char *buf, size_t size)
53 {
54 struct led_classdev *led_cdev = led_trigger_get_led(dev);
55 struct transient_trig_data *transient_data =
56 led_trigger_get_drvdata(dev);
57 unsigned long state;
58 ssize_t ret;
59
60 ret = kstrtoul(buf, 10, &state);
61 if (ret)
62 return ret;
63
64 if (state != 1 && state != 0)
65 return -EINVAL;
66
67
68 if (state == 0 && transient_data->activate == 1) {
69 del_timer(&transient_data->timer);
70 transient_data->activate = state;
71 led_set_brightness_nosleep(led_cdev,
72 transient_data->restore_state);
73 return size;
74 }
75
76
77 if (state == 1 && transient_data->activate == 0 &&
78 transient_data->duration != 0) {
79 transient_data->activate = state;
80 led_set_brightness_nosleep(led_cdev, transient_data->state);
81 transient_data->restore_state =
82 (transient_data->state == LED_FULL) ? LED_OFF : LED_FULL;
83 mod_timer(&transient_data->timer,
84 jiffies + msecs_to_jiffies(transient_data->duration));
85 }
86
87
88
89
90
91
92 return size;
93 }
94
95 static ssize_t transient_duration_show(struct device *dev,
96 struct device_attribute *attr, char *buf)
97 {
98 struct transient_trig_data *transient_data = led_trigger_get_drvdata(dev);
99
100 return sprintf(buf, "%lu\n", transient_data->duration);
101 }
102
103 static ssize_t transient_duration_store(struct device *dev,
104 struct device_attribute *attr, const char *buf, size_t size)
105 {
106 struct transient_trig_data *transient_data =
107 led_trigger_get_drvdata(dev);
108 unsigned long state;
109 ssize_t ret;
110
111 ret = kstrtoul(buf, 10, &state);
112 if (ret)
113 return ret;
114
115 transient_data->duration = state;
116 return size;
117 }
118
119 static ssize_t transient_state_show(struct device *dev,
120 struct device_attribute *attr, char *buf)
121 {
122 struct transient_trig_data *transient_data =
123 led_trigger_get_drvdata(dev);
124 int state;
125
126 state = (transient_data->state == LED_FULL) ? 1 : 0;
127 return sprintf(buf, "%d\n", state);
128 }
129
130 static ssize_t transient_state_store(struct device *dev,
131 struct device_attribute *attr, const char *buf, size_t size)
132 {
133 struct transient_trig_data *transient_data =
134 led_trigger_get_drvdata(dev);
135 unsigned long state;
136 ssize_t ret;
137
138 ret = kstrtoul(buf, 10, &state);
139 if (ret)
140 return ret;
141
142 if (state != 1 && state != 0)
143 return -EINVAL;
144
145 transient_data->state = (state == 1) ? LED_FULL : LED_OFF;
146 return size;
147 }
148
149 static DEVICE_ATTR(activate, 0644, transient_activate_show,
150 transient_activate_store);
151 static DEVICE_ATTR(duration, 0644, transient_duration_show,
152 transient_duration_store);
153 static DEVICE_ATTR(state, 0644, transient_state_show, transient_state_store);
154
155 static struct attribute *transient_trig_attrs[] = {
156 &dev_attr_activate.attr,
157 &dev_attr_duration.attr,
158 &dev_attr_state.attr,
159 NULL
160 };
161 ATTRIBUTE_GROUPS(transient_trig);
162
163 static int transient_trig_activate(struct led_classdev *led_cdev)
164 {
165 struct transient_trig_data *tdata;
166
167 tdata = kzalloc(sizeof(struct transient_trig_data), GFP_KERNEL);
168 if (!tdata)
169 return -ENOMEM;
170
171 led_set_trigger_data(led_cdev, tdata);
172 tdata->led_cdev = led_cdev;
173
174 timer_setup(&tdata->timer, transient_timer_function, 0);
175
176 return 0;
177 }
178
179 static void transient_trig_deactivate(struct led_classdev *led_cdev)
180 {
181 struct transient_trig_data *transient_data = led_get_trigger_data(led_cdev);
182
183 del_timer_sync(&transient_data->timer);
184 led_set_brightness_nosleep(led_cdev, transient_data->restore_state);
185 kfree(transient_data);
186 }
187
188 static struct led_trigger transient_trigger = {
189 .name = "transient",
190 .activate = transient_trig_activate,
191 .deactivate = transient_trig_deactivate,
192 .groups = transient_trig_groups,
193 };
194 module_led_trigger(transient_trigger);
195
196 MODULE_AUTHOR("Shuah Khan <shuahkhan@gmail.com>");
197 MODULE_DESCRIPTION("Transient LED trigger");
198 MODULE_LICENSE("GPL v2");