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This commit is contained in:
Wolfgang Hottgenroth
2025-06-04 12:50:24 +01:00
parent 1af4490a39
commit f86f43b5fd
1 changed files with 46 additions and 46 deletions
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92
driver/counter.c
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@ -17,19 +17,19 @@ static int dt_probe(struct platform_device *pdev);
static void dt_remove(struct platform_device *pdev);
static struct of_device_id my_driver_ids[] = {
{
.compatible = "hottis,counter",
}, { /* sentinel */ }
{
.compatible = "hottis,counter",
}, { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, my_driver_ids);
static struct platform_driver my_driver = {
.probe = dt_probe,
.remove = dt_remove,
.driver = {
.name = "my_device_driver",
.of_match_table = my_driver_ids,
},
.probe = dt_probe,
.remove = dt_remove,
.driver = {
.name = "my_device_driver",
.of_match_table = my_driver_ids,
},
};
/* GPIO variable */
@ -41,70 +41,70 @@ static struct gpio_desc *blue_led = NULL;
* @brief This function is called on loading the driver
*/
static int dt_probe(struct platform_device *pdev) {
struct device *dev = &pdev->dev;
struct device *dev = &pdev->dev;
printk("counter - probing\n");
printk("counter - probing\n");
if(!device_property_present(dev, "red-led-gpio")) {
printk("counter - Error! Device property 'red-led-gpio' not found!\n");
return -1;
}
if(!device_property_present(dev, "blue-led-gpio")) {
printk("counter - Error! Device property 'blue-led-gpio' not found!\n");
return -1;
}
if(!device_property_present(dev, "red-led-gpio")) {
printk("counter - Error! Device property 'red-led-gpio' not found!\n");
return -1;
}
if(!device_property_present(dev, "blue-led-gpio")) {
printk("counter - Error! Device property 'blue-led-gpio' not found!\n");
return -1;
}
/* Init GPIO */
red_led = gpiod_get(dev, "red-led", GPIOD_OUT_LOW);
if(IS_ERR(red_led)) {
printk("counter - Error! Could not setup the GPIO red-led\n");
return -1 * IS_ERR(red_led);
}
blue_led = gpiod_get(dev, "blue-led", GPIOD_OUT_LOW);
if(IS_ERR(blue_led)) {
printk("counter - Error! Could not setup the GPIO blue-led\n");
return -1 * IS_ERR(blue_led);
}
/* Init GPIO */
red_led = gpiod_get(dev, "red-led", GPIOD_OUT_LOW);
if(IS_ERR(red_led)) {
printk("counter - Error! Could not setup the GPIO red-led\n");
return -1 * IS_ERR(red_led);
}
blue_led = gpiod_get(dev, "blue-led", GPIOD_OUT_LOW);
if(IS_ERR(blue_led)) {
printk("counter - Error! Could not setup the GPIO blue-led\n");
return -1 * IS_ERR(blue_led);
}
return 0;
return 0;
}
/**
* @brief This function is called on unloading the driver
*/
static void dt_remove(struct platform_device *pdev) {
printk("counter - removing\n");
gpiod_put(red_led);
gpiod_put(blue_led);
printk("counter - removing\n");
gpiod_put(red_led);
gpiod_put(blue_led);
}
/**
* @brief This function is called, when the module is loaded into the kernel
*/
static int __init my_init(void) {
printk("counter - Loading the driver...\n");
if(platform_driver_register(&my_driver)) {
printk("dt_gpio - Error! Could not load driver\n");
return -1;
}
printk("counter - Loading the driver...\n");
if(platform_driver_register(&my_driver)) {
printk("dt_gpio - Error! Could not load driver\n");
return -1;
}
printk("counter - red led on\n");
gpiod_set_value(red_led, 1);
printk("counter - red led on\n");
gpiod_set_value(red_led, 1);
return 0;
return 0;
}
/**
* @brief This function is called, when the module is removed from the kernel
*/
static void __exit my_exit(void) {
printk("counter - Unload driver");
printk("counter - Unload driver");
printk("counter - red led off\n");
gpiod_set_value(red_led, 0);
printk("counter - red led off\n");
gpiod_set_value(red_led, 0);
platform_driver_unregister(&my_driver);
platform_driver_unregister(&my_driver);
}
module_init(my_init);