75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mod_devicetable.h>
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#include <linux/property.h>
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#include <linux/platform_device.h>
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#include <linux/of_device.h>
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#include <linux/gpio/consumer.h>
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/* leds stuff */
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static int dt_leds_probe(struct platform_device *pdev);
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static void dt_leds_remove(struct platform_device *pdev);
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static struct of_device_id leds_driver_ids[] = {
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{
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.compatible = "hottis,leds",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, leds_driver_ids);
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struct platform_driver leds_driver = {
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.probe = dt_leds_probe,
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.remove = dt_leds_remove,
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.driver = {
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.name = "leds_device_driver",
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.of_match_table = leds_driver_ids,
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},
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};
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static struct gpio_desc *red_led = NULL;
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static struct gpio_desc *blue_led = NULL;
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static int dt_leds_probe(struct platform_device *pdev) {
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struct device *dev = &pdev->dev;
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printk("counter - leds probing\n");
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if(!device_property_present(dev, "red-led-gpio")) {
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printk("counter - Error! Device property 'red-led-gpio' not found!\n");
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return -1;
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}
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if(!device_property_present(dev, "blue-led-gpio")) {
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printk("counter - Error! Device property 'blue-led-gpio' not found!\n");
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return -1;
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}
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/* Init GPIO */
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red_led = gpiod_get(dev, "red-led", GPIOD_OUT_LOW);
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if(IS_ERR(red_led)) {
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printk("counter - Error! Could not setup the GPIO red-led\n");
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return -1 * IS_ERR(red_led);
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}
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blue_led = gpiod_get(dev, "blue-led", GPIOD_OUT_LOW);
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if(IS_ERR(blue_led)) {
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printk("counter - Error! Could not setup the GPIO blue-led\n");
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return -1 * IS_ERR(blue_led);
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}
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printk("counter - red led on\n");
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gpiod_set_value(red_led, 1);
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return 0;
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}
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static void dt_leds_remove(struct platform_device *pdev) {
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printk("counter - red led off\n");
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gpiod_set_value(red_led, 0);
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printk("counter - leds removing\n");
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gpiod_put(red_led);
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gpiod_put(blue_led);
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}
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