^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * ledtrig-gio.c - LED Trigger Based on GPIO events
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright 2009 Felipe Balbi <me@felipebalbi.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/gpio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/leds.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "../leds.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) struct gpio_trig_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) struct led_classdev *led;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) unsigned desired_brightness; /* desired brightness when led is on */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) unsigned inverted; /* true when gpio is inverted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) unsigned gpio; /* gpio that triggers the leds */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static irqreturn_t gpio_trig_irq(int irq, void *_led)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct led_classdev *led = _led;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct gpio_trig_data *gpio_data = led_get_trigger_data(led);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) int tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) tmp = gpio_get_value_cansleep(gpio_data->gpio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) if (gpio_data->inverted)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) tmp = !tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) if (tmp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) if (gpio_data->desired_brightness)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) led_set_brightness_nosleep(gpio_data->led,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) gpio_data->desired_brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) led_set_brightness_nosleep(gpio_data->led, LED_FULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) led_set_brightness_nosleep(gpio_data->led, LED_OFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) return IRQ_HANDLED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) static ssize_t gpio_trig_brightness_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) return sprintf(buf, "%u\n", gpio_data->desired_brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) static ssize_t gpio_trig_brightness_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct device_attribute *attr, const char *buf, size_t n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) unsigned desired_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) ret = sscanf(buf, "%u", &desired_brightness);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if (ret < 1 || desired_brightness > 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) dev_err(dev, "invalid value\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) gpio_data->desired_brightness = desired_brightness;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static DEVICE_ATTR(desired_brightness, 0644, gpio_trig_brightness_show,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) gpio_trig_brightness_store);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) static ssize_t gpio_trig_inverted_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) return sprintf(buf, "%u\n", gpio_data->inverted);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static ssize_t gpio_trig_inverted_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct device_attribute *attr, const char *buf, size_t n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) struct led_classdev *led = led_trigger_get_led(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) unsigned long inverted;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) ret = kstrtoul(buf, 10, &inverted);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (inverted > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) gpio_data->inverted = inverted;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /* After inverting, we need to update the LED. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (gpio_is_valid(gpio_data->gpio))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) gpio_trig_irq(0, led);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) static DEVICE_ATTR(inverted, 0644, gpio_trig_inverted_show,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) gpio_trig_inverted_store);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static ssize_t gpio_trig_gpio_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) return sprintf(buf, "%u\n", gpio_data->gpio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) static ssize_t gpio_trig_gpio_store(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) struct device_attribute *attr, const char *buf, size_t n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) struct led_classdev *led = led_trigger_get_led(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) struct gpio_trig_data *gpio_data = led_trigger_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) unsigned gpio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) ret = sscanf(buf, "%u", &gpio);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) if (ret < 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) dev_err(dev, "couldn't read gpio number\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (gpio_data->gpio == gpio)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (!gpio_is_valid(gpio)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (gpio_is_valid(gpio_data->gpio))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) free_irq(gpio_to_irq(gpio_data->gpio), led);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) gpio_data->gpio = gpio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) ret = request_threaded_irq(gpio_to_irq(gpio), NULL, gpio_trig_irq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) IRQF_ONESHOT | IRQF_SHARED | IRQF_TRIGGER_RISING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) | IRQF_TRIGGER_FALLING, "ledtrig-gpio", led);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) dev_err(dev, "request_irq failed with error %d\n", ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) if (gpio_is_valid(gpio_data->gpio))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) free_irq(gpio_to_irq(gpio_data->gpio), led);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) gpio_data->gpio = gpio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) /* After changing the GPIO, we need to update the LED. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) gpio_trig_irq(0, led);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) return ret ? ret : n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static DEVICE_ATTR(gpio, 0644, gpio_trig_gpio_show, gpio_trig_gpio_store);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) static struct attribute *gpio_trig_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) &dev_attr_desired_brightness.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) &dev_attr_inverted.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) &dev_attr_gpio.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) ATTRIBUTE_GROUPS(gpio_trig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static int gpio_trig_activate(struct led_classdev *led)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) struct gpio_trig_data *gpio_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) gpio_data = kzalloc(sizeof(*gpio_data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) if (!gpio_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) gpio_data->led = led;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) gpio_data->gpio = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) led_set_trigger_data(led, gpio_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) static void gpio_trig_deactivate(struct led_classdev *led)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) struct gpio_trig_data *gpio_data = led_get_trigger_data(led);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (gpio_is_valid(gpio_data->gpio))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) free_irq(gpio_to_irq(gpio_data->gpio), led);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) kfree(gpio_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) static struct led_trigger gpio_led_trigger = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) .name = "gpio",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) .activate = gpio_trig_activate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) .deactivate = gpio_trig_deactivate,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) .groups = gpio_trig_groups,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) module_led_trigger(gpio_led_trigger);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) MODULE_AUTHOR("Felipe Balbi <me@felipebalbi.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) MODULE_DESCRIPTION("GPIO LED trigger");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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