summaryrefslogtreecommitdiff
path: root/drivers/leds/ledtrig-gpio.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/leds/ledtrig-gpio.c')
-rw-r--r--drivers/leds/ledtrig-gpio.c253
1 files changed, 0 insertions, 253 deletions
diff --git a/drivers/leds/ledtrig-gpio.c b/drivers/leds/ledtrig-gpio.c
deleted file mode 100644
index 72e3ebfc281f..000000000000
--- a/drivers/leds/ledtrig-gpio.c
+++ /dev/null
@@ -1,253 +0,0 @@
-/*
- * ledtrig-gio.c - LED Trigger Based on GPIO events
- *
- * Copyright 2009 Felipe Balbi <me@felipebalbi.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/gpio.h>
-#include <linux/interrupt.h>
-#include <linux/workqueue.h>
-#include <linux/leds.h>
-#include <linux/slab.h>
-#include "leds.h"
-
-struct gpio_trig_data {
- struct led_classdev *led;
- struct work_struct work;
-
- unsigned desired_brightness; /* desired brightness when led is on */
- unsigned inverted; /* true when gpio is inverted */
- unsigned gpio; /* gpio that triggers the leds */
-};
-
-static irqreturn_t gpio_trig_irq(int irq, void *_led)
-{
- struct led_classdev *led = _led;
- struct gpio_trig_data *gpio_data = led->trigger_data;
-
- /* just schedule_work since gpio_get_value can sleep */
- schedule_work(&gpio_data->work);
-
- return IRQ_HANDLED;
-};
-
-static void gpio_trig_work(struct work_struct *work)
-{
- struct gpio_trig_data *gpio_data = container_of(work,
- struct gpio_trig_data, work);
- int tmp;
-
- if (!gpio_data->gpio)
- return;
-
- tmp = gpio_get_value(gpio_data->gpio);
- if (gpio_data->inverted)
- tmp = !tmp;
-
- if (tmp) {
- if (gpio_data->desired_brightness)
- __led_set_brightness(gpio_data->led,
- gpio_data->desired_brightness);
- else
- __led_set_brightness(gpio_data->led, LED_FULL);
- } else {
- __led_set_brightness(gpio_data->led, LED_OFF);
- }
-}
-
-static ssize_t gpio_trig_brightness_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct led_classdev *led = dev_get_drvdata(dev);
- struct gpio_trig_data *gpio_data = led->trigger_data;
-
- return sprintf(buf, "%u\n", gpio_data->desired_brightness);
-}
-
-static ssize_t gpio_trig_brightness_store(struct device *dev,
- struct device_attribute *attr, const char *buf, size_t n)
-{
- struct led_classdev *led = dev_get_drvdata(dev);
- struct gpio_trig_data *gpio_data = led->trigger_data;
- unsigned desired_brightness;
- int ret;
-
- ret = sscanf(buf, "%u", &desired_brightness);
- if (ret < 1 || desired_brightness > 255) {
- dev_err(dev, "invalid value\n");
- return -EINVAL;
- }
-
- gpio_data->desired_brightness = desired_brightness;
-
- return n;
-}
-static DEVICE_ATTR(desired_brightness, 0644, gpio_trig_brightness_show,
- gpio_trig_brightness_store);
-
-static ssize_t gpio_trig_inverted_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct led_classdev *led = dev_get_drvdata(dev);
- struct gpio_trig_data *gpio_data = led->trigger_data;
-
- return sprintf(buf, "%u\n", gpio_data->inverted);
-}
-
-static ssize_t gpio_trig_inverted_store(struct device *dev,
- struct device_attribute *attr, const char *buf, size_t n)
-{
- struct led_classdev *led = dev_get_drvdata(dev);
- struct gpio_trig_data *gpio_data = led->trigger_data;
- unsigned long inverted;
- int ret;
-
- ret = kstrtoul(buf, 10, &inverted);
- if (ret < 0)
- return ret;
-
- if (inverted > 1)
- return -EINVAL;
-
- gpio_data->inverted = inverted;
-
- /* After inverting, we need to update the LED. */
- schedule_work(&gpio_data->work);
-
- return n;
-}
-static DEVICE_ATTR(inverted, 0644, gpio_trig_inverted_show,
- gpio_trig_inverted_store);
-
-static ssize_t gpio_trig_gpio_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct led_classdev *led = dev_get_drvdata(dev);
- struct gpio_trig_data *gpio_data = led->trigger_data;
-
- return sprintf(buf, "%u\n", gpio_data->gpio);
-}
-
-static ssize_t gpio_trig_gpio_store(struct device *dev,
- struct device_attribute *attr, const char *buf, size_t n)
-{
- struct led_classdev *led = dev_get_drvdata(dev);
- struct gpio_trig_data *gpio_data = led->trigger_data;
- unsigned gpio;
- int ret;
-
- ret = sscanf(buf, "%u", &gpio);
- if (ret < 1) {
- dev_err(dev, "couldn't read gpio number\n");
- flush_work(&gpio_data->work);
- return -EINVAL;
- }
-
- if (gpio_data->gpio == gpio)
- return n;
-
- if (!gpio) {
- if (gpio_data->gpio != 0)
- free_irq(gpio_to_irq(gpio_data->gpio), led);
- gpio_data->gpio = 0;
- return n;
- }
-
- ret = request_irq(gpio_to_irq(gpio), gpio_trig_irq,
- IRQF_SHARED | IRQF_TRIGGER_RISING
- | IRQF_TRIGGER_FALLING, "ledtrig-gpio", led);
- if (ret) {
- dev_err(dev, "request_irq failed with error %d\n", ret);
- } else {
- if (gpio_data->gpio != 0)
- free_irq(gpio_to_irq(gpio_data->gpio), led);
- gpio_data->gpio = gpio;
- }
-
- return ret ? ret : n;
-}
-static DEVICE_ATTR(gpio, 0644, gpio_trig_gpio_show, gpio_trig_gpio_store);
-
-static void gpio_trig_activate(struct led_classdev *led)
-{
- struct gpio_trig_data *gpio_data;
- int ret;
-
- gpio_data = kzalloc(sizeof(*gpio_data), GFP_KERNEL);
- if (!gpio_data)
- return;
-
- ret = device_create_file(led->dev, &dev_attr_gpio);
- if (ret)
- goto err_gpio;
-
- ret = device_create_file(led->dev, &dev_attr_inverted);
- if (ret)
- goto err_inverted;
-
- ret = device_create_file(led->dev, &dev_attr_desired_brightness);
- if (ret)
- goto err_brightness;
-
- gpio_data->led = led;
- led->trigger_data = gpio_data;
- INIT_WORK(&gpio_data->work, gpio_trig_work);
- led->activated = true;
-
- return;
-
-err_brightness:
- device_remove_file(led->dev, &dev_attr_inverted);
-
-err_inverted:
- device_remove_file(led->dev, &dev_attr_gpio);
-
-err_gpio:
- kfree(gpio_data);
-}
-
-static void gpio_trig_deactivate(struct led_classdev *led)
-{
- struct gpio_trig_data *gpio_data = led->trigger_data;
-
- if (led->activated) {
- device_remove_file(led->dev, &dev_attr_gpio);
- device_remove_file(led->dev, &dev_attr_inverted);
- device_remove_file(led->dev, &dev_attr_desired_brightness);
- flush_work(&gpio_data->work);
- if (gpio_data->gpio != 0)
- free_irq(gpio_to_irq(gpio_data->gpio), led);
- kfree(gpio_data);
- led->activated = false;
- }
-}
-
-static struct led_trigger gpio_led_trigger = {
- .name = "gpio",
- .activate = gpio_trig_activate,
- .deactivate = gpio_trig_deactivate,
-};
-
-static int __init gpio_trig_init(void)
-{
- return led_trigger_register(&gpio_led_trigger);
-}
-module_init(gpio_trig_init);
-
-static void __exit gpio_trig_exit(void)
-{
- led_trigger_unregister(&gpio_led_trigger);
-}
-module_exit(gpio_trig_exit);
-
-MODULE_AUTHOR("Felipe Balbi <me@felipebalbi.com>");
-MODULE_DESCRIPTION("GPIO LED trigger");
-MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.0.4) at 2024-06-24 23:01:03 +0000