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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 | // SPDX-License-Identifier: GPL-2.0-only /* * One-shot LED Trigger * * Copyright 2012, Fabio Baltieri <fabio.baltieri@gmail.com> * * Based on ledtrig-timer.c by 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> #include "../leds.h" #define DEFAULT_DELAY 100 struct oneshot_trig_data { unsigned int invert; }; static ssize_t led_shot(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { struct led_classdev *led_cdev = led_trigger_get_led(dev); struct oneshot_trig_data *oneshot_data = led_trigger_get_drvdata(dev); led_blink_set_oneshot(led_cdev, &led_cdev->blink_delay_on, &led_cdev->blink_delay_off, oneshot_data->invert); /* content is ignored */ return size; } static ssize_t led_invert_show(struct device *dev, struct device_attribute *attr, char *buf) { struct oneshot_trig_data *oneshot_data = led_trigger_get_drvdata(dev); return sprintf(buf, "%u\n", oneshot_data->invert); } static ssize_t led_invert_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { struct led_classdev *led_cdev = led_trigger_get_led(dev); struct oneshot_trig_data *oneshot_data = led_trigger_get_drvdata(dev); unsigned long state; int ret; ret = kstrtoul(buf, 0, &state); if (ret) return ret; oneshot_data->invert = !!state; if (oneshot_data->invert) led_set_brightness_nosleep(led_cdev, LED_FULL); else led_set_brightness_nosleep(led_cdev, LED_OFF); return size; } 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; int ret; ret = kstrtoul(buf, 0, &state); if (ret) return ret; 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; int ret; ret = kstrtoul(buf, 0, &state); if (ret) return ret; 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 DEVICE_ATTR(invert, 0644, led_invert_show, led_invert_store); static DEVICE_ATTR(shot, 0200, NULL, led_shot); static struct attribute *oneshot_trig_attrs[] = { &dev_attr_delay_on.attr, &dev_attr_delay_off.attr, &dev_attr_invert.attr, &dev_attr_shot.attr, NULL }; ATTRIBUTE_GROUPS(oneshot_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) goto out_default; if (size != 2) { dev_warn(led_cdev->dev, "Expected 2 but got %u values for delays pattern\n", size); goto out_default; } led_cdev->blink_delay_on = pattern[0]; led_cdev->blink_delay_off = pattern[1]; kfree(pattern); return; out_default: kfree(pattern); led_cdev->blink_delay_on = DEFAULT_DELAY; led_cdev->blink_delay_off = DEFAULT_DELAY; } static int oneshot_trig_activate(struct led_classdev *led_cdev) { struct oneshot_trig_data *oneshot_data; oneshot_data = kzalloc(sizeof(*oneshot_data), GFP_KERNEL); if (!oneshot_data) return -ENOMEM; led_set_trigger_data(led_cdev, oneshot_data); 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; } return 0; } static void oneshot_trig_deactivate(struct led_classdev *led_cdev) { struct oneshot_trig_data *oneshot_data = led_get_trigger_data(led_cdev); kfree(oneshot_data); /* Stop blinking */ led_set_brightness(led_cdev, LED_OFF); } static struct led_trigger oneshot_led_trigger = { .name = "oneshot", .activate = oneshot_trig_activate, .deactivate = oneshot_trig_deactivate, .groups = oneshot_trig_groups, }; module_led_trigger(oneshot_led_trigger); MODULE_AUTHOR("Fabio Baltieri <fabio.baltieri@gmail.com>"); MODULE_DESCRIPTION("One-shot LED trigger"); MODULE_LICENSE("GPL v2"); |