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