1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * LED Kernel Timer Trigger
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright 2005-2006 Openedhand Ltd.
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Author: Richard Purdie <rpurdie@openedhand.com>
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/module.h>
11*4882a593Smuzhiyun #include <linux/kernel.h>
12*4882a593Smuzhiyun #include <linux/init.h>
13*4882a593Smuzhiyun #include <linux/device.h>
14*4882a593Smuzhiyun #include <linux/ctype.h>
15*4882a593Smuzhiyun #include <linux/slab.h>
16*4882a593Smuzhiyun #include <linux/leds.h>
17*4882a593Smuzhiyun
led_delay_on_show(struct device * dev,struct device_attribute * attr,char * buf)18*4882a593Smuzhiyun static ssize_t led_delay_on_show(struct device *dev,
19*4882a593Smuzhiyun struct device_attribute *attr, char *buf)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun struct led_classdev *led_cdev = led_trigger_get_led(dev);
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun return sprintf(buf, "%lu\n", led_cdev->blink_delay_on);
24*4882a593Smuzhiyun }
25*4882a593Smuzhiyun
led_delay_on_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)26*4882a593Smuzhiyun static ssize_t led_delay_on_store(struct device *dev,
27*4882a593Smuzhiyun struct device_attribute *attr, const char *buf, size_t size)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun struct led_classdev *led_cdev = led_trigger_get_led(dev);
30*4882a593Smuzhiyun unsigned long state;
31*4882a593Smuzhiyun ssize_t ret;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun ret = kstrtoul(buf, 10, &state);
34*4882a593Smuzhiyun if (ret)
35*4882a593Smuzhiyun return ret;
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off);
38*4882a593Smuzhiyun led_cdev->blink_delay_on = state;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun return size;
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun
led_delay_off_show(struct device * dev,struct device_attribute * attr,char * buf)43*4882a593Smuzhiyun static ssize_t led_delay_off_show(struct device *dev,
44*4882a593Smuzhiyun struct device_attribute *attr, char *buf)
45*4882a593Smuzhiyun {
46*4882a593Smuzhiyun struct led_classdev *led_cdev = led_trigger_get_led(dev);
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun return sprintf(buf, "%lu\n", led_cdev->blink_delay_off);
49*4882a593Smuzhiyun }
50*4882a593Smuzhiyun
led_delay_off_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)51*4882a593Smuzhiyun static ssize_t led_delay_off_store(struct device *dev,
52*4882a593Smuzhiyun struct device_attribute *attr, const char *buf, size_t size)
53*4882a593Smuzhiyun {
54*4882a593Smuzhiyun struct led_classdev *led_cdev = led_trigger_get_led(dev);
55*4882a593Smuzhiyun unsigned long state;
56*4882a593Smuzhiyun ssize_t ret;
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun ret = kstrtoul(buf, 10, &state);
59*4882a593Smuzhiyun if (ret)
60*4882a593Smuzhiyun return ret;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state);
63*4882a593Smuzhiyun led_cdev->blink_delay_off = state;
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun return size;
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
69*4882a593Smuzhiyun static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun static struct attribute *timer_trig_attrs[] = {
72*4882a593Smuzhiyun &dev_attr_delay_on.attr,
73*4882a593Smuzhiyun &dev_attr_delay_off.attr,
74*4882a593Smuzhiyun NULL
75*4882a593Smuzhiyun };
76*4882a593Smuzhiyun ATTRIBUTE_GROUPS(timer_trig);
77*4882a593Smuzhiyun
pattern_init(struct led_classdev * led_cdev)78*4882a593Smuzhiyun static void pattern_init(struct led_classdev *led_cdev)
79*4882a593Smuzhiyun {
80*4882a593Smuzhiyun u32 *pattern;
81*4882a593Smuzhiyun unsigned int size = 0;
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun pattern = led_get_default_pattern(led_cdev, &size);
84*4882a593Smuzhiyun if (!pattern)
85*4882a593Smuzhiyun return;
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun if (size != 2) {
88*4882a593Smuzhiyun dev_warn(led_cdev->dev,
89*4882a593Smuzhiyun "Expected 2 but got %u values for delays pattern\n",
90*4882a593Smuzhiyun size);
91*4882a593Smuzhiyun goto out;
92*4882a593Smuzhiyun }
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun led_cdev->blink_delay_on = pattern[0];
95*4882a593Smuzhiyun led_cdev->blink_delay_off = pattern[1];
96*4882a593Smuzhiyun /* led_blink_set() called by caller */
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun out:
99*4882a593Smuzhiyun kfree(pattern);
100*4882a593Smuzhiyun }
101*4882a593Smuzhiyun
timer_trig_activate(struct led_classdev * led_cdev)102*4882a593Smuzhiyun static int timer_trig_activate(struct led_classdev *led_cdev)
103*4882a593Smuzhiyun {
104*4882a593Smuzhiyun if (led_cdev->flags & LED_INIT_DEFAULT_TRIGGER) {
105*4882a593Smuzhiyun pattern_init(led_cdev);
106*4882a593Smuzhiyun /*
107*4882a593Smuzhiyun * Mark as initialized even on pattern_init() error because
108*4882a593Smuzhiyun * any consecutive call to it would produce the same error.
109*4882a593Smuzhiyun */
110*4882a593Smuzhiyun led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER;
111*4882a593Smuzhiyun }
112*4882a593Smuzhiyun
113*4882a593Smuzhiyun /*
114*4882a593Smuzhiyun * If "set brightness to 0" is pending in workqueue, we don't
115*4882a593Smuzhiyun * want that to be reordered after blink_set()
116*4882a593Smuzhiyun */
117*4882a593Smuzhiyun flush_work(&led_cdev->set_brightness_work);
118*4882a593Smuzhiyun led_blink_set(led_cdev, &led_cdev->blink_delay_on,
119*4882a593Smuzhiyun &led_cdev->blink_delay_off);
120*4882a593Smuzhiyun
121*4882a593Smuzhiyun return 0;
122*4882a593Smuzhiyun }
123*4882a593Smuzhiyun
timer_trig_deactivate(struct led_classdev * led_cdev)124*4882a593Smuzhiyun static void timer_trig_deactivate(struct led_classdev *led_cdev)
125*4882a593Smuzhiyun {
126*4882a593Smuzhiyun /* Stop blinking */
127*4882a593Smuzhiyun led_set_brightness(led_cdev, LED_OFF);
128*4882a593Smuzhiyun }
129*4882a593Smuzhiyun
130*4882a593Smuzhiyun static struct led_trigger timer_led_trigger = {
131*4882a593Smuzhiyun .name = "timer",
132*4882a593Smuzhiyun .activate = timer_trig_activate,
133*4882a593Smuzhiyun .deactivate = timer_trig_deactivate,
134*4882a593Smuzhiyun .groups = timer_trig_groups,
135*4882a593Smuzhiyun };
136*4882a593Smuzhiyun module_led_trigger(timer_led_trigger);
137*4882a593Smuzhiyun
138*4882a593Smuzhiyun MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
139*4882a593Smuzhiyun MODULE_DESCRIPTION("Timer LED trigger");
140*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
141