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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * LED Kernel Timer Trigger4 *5 * Copyright 2005-2006 Openedhand Ltd.6 *7 * Author: Richard Purdie <rpurdie@openedhand.com>8 */9 10#include <linux/module.h>11#include <linux/kernel.h>12#include <linux/init.h>13#include <linux/device.h>14#include <linux/ctype.h>15#include <linux/slab.h>16#include <linux/leds.h>17 18static ssize_t led_delay_on_show(struct device *dev,19 struct device_attribute *attr, char *buf)20{21 struct led_classdev *led_cdev = led_trigger_get_led(dev);22 23 return sprintf(buf, "%lu\n", led_cdev->blink_delay_on);24}25 26static ssize_t led_delay_on_store(struct device *dev,27 struct device_attribute *attr, const char *buf, size_t size)28{29 struct led_classdev *led_cdev = led_trigger_get_led(dev);30 unsigned long state;31 ssize_t ret;32 33 ret = kstrtoul(buf, 10, &state);34 if (ret)35 return ret;36 37 led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off);38 led_cdev->blink_delay_on = state;39 40 return size;41}42 43static ssize_t led_delay_off_show(struct device *dev,44 struct device_attribute *attr, char *buf)45{46 struct led_classdev *led_cdev = led_trigger_get_led(dev);47 48 return sprintf(buf, "%lu\n", led_cdev->blink_delay_off);49}50 51static ssize_t led_delay_off_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 unsigned long state;56 ssize_t ret;57 58 ret = kstrtoul(buf, 10, &state);59 if (ret)60 return ret;61 62 led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state);63 led_cdev->blink_delay_off = state;64 65 return size;66}67 68static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);69static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);70 71static struct attribute *timer_trig_attrs[] = {72 &dev_attr_delay_on.attr,73 &dev_attr_delay_off.attr,74 NULL75};76ATTRIBUTE_GROUPS(timer_trig);77 78static void pattern_init(struct led_classdev *led_cdev)79{80 u32 *pattern;81 unsigned int size = 0;82 83 pattern = led_get_default_pattern(led_cdev, &size);84 if (!pattern)85 return;86 87 if (size != 2) {88 dev_warn(led_cdev->dev,89 "Expected 2 but got %u values for delays pattern\n",90 size);91 goto out;92 }93 94 led_cdev->blink_delay_on = pattern[0];95 led_cdev->blink_delay_off = pattern[1];96 /* led_blink_set() called by caller */97 98out:99 kfree(pattern);100}101 102static int timer_trig_activate(struct led_classdev *led_cdev)103{104 if (led_cdev->flags & LED_INIT_DEFAULT_TRIGGER) {105 pattern_init(led_cdev);106 /*107 * Mark as initialized even on pattern_init() error because108 * any consecutive call to it would produce the same error.109 */110 led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER;111 }112 113 led_blink_set(led_cdev, &led_cdev->blink_delay_on,114 &led_cdev->blink_delay_off);115 116 return 0;117}118 119static void timer_trig_deactivate(struct led_classdev *led_cdev)120{121 /* Stop blinking */122 led_set_brightness(led_cdev, LED_OFF);123}124 125static struct led_trigger timer_led_trigger = {126 .name = "timer",127 .activate = timer_trig_activate,128 .deactivate = timer_trig_deactivate,129 .groups = timer_trig_groups,130};131module_led_trigger(timer_led_trigger);132 133MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");134MODULE_DESCRIPTION("Timer LED trigger");135MODULE_LICENSE("GPL v2");136