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some progress indeed

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This commit is contained in:
Wolfgang Hottgenroth
2025-06-04 12:43:11 +01:00
parent 95a3395313
commit 1af4490a39
3 changed files with 35 additions and 42 deletions
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65
driver/counter.c
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@ -18,7 +18,7 @@ static void dt_remove(struct platform_device *pdev);
static struct of_device_id my_driver_ids[] = {
{
.compatible = "brightlight,mydev",
.compatible = "hottis,counter",
}, { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, my_driver_ids);
@ -33,7 +33,8 @@ static struct platform_driver my_driver = {
};
/* GPIO variable */
static struct gpio_desc *my_led = NULL;
static struct gpio_desc *red_led = NULL;
static struct gpio_desc *blue_led = NULL;
/**
@ -41,44 +42,29 @@ static struct gpio_desc *my_led = NULL;
*/
static int dt_probe(struct platform_device *pdev) {
struct device *dev = &pdev->dev;
const char *label;
int my_value, ret;
printk("dt_gpio - Now I am in the probe function!\n");
printk("counter - probing\n");
/* Check for device properties */
if(!device_property_present(dev, "label")) {
printk("dt_gpio - Error! Device property 'label' not found!\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, "my_value")) {
printk("dt_gpio - Error! Device property 'my_value' not found!\n");
return -1;
}
if(!device_property_present(dev, "green-led-gpio")) {
printk("dt_gpio - Error! Device property 'green-led-gpio' not found!\n");
if(!device_property_present(dev, "blue-led-gpio")) {
printk("counter - Error! Device property 'blue-led-gpio' not found!\n");
return -1;
}
/* Read device properties */
ret = device_property_read_string(dev, "label", &label);
if(ret) {
printk("dt_gpio - Error! Could not read 'label'\n");
return -1;
}
printk("dt_gpio - label: %s\n", label);
ret = device_property_read_u32(dev, "my_value", &my_value);
if(ret) {
printk("dt_gpio - Error! Could not read 'my_value'\n");
return -1;
}
printk("dt_gpio - my_value: %d\n", my_value);
/* Init GPIO */
my_led = gpiod_get(dev, "green-led", GPIOD_OUT_LOW);
if(IS_ERR(my_led)) {
printk("dt_gpio - Error! Could not setup the GPIO\n");
return -1 * IS_ERR(my_led);
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;
@ -88,19 +74,24 @@ static int dt_probe(struct platform_device *pdev) {
* @brief This function is called on unloading the driver
*/
static void dt_remove(struct platform_device *pdev) {
printk("dt_gpio - Now I am in the remove function\n");
gpiod_put(my_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("dt_gpio - Loading the driver...\n");
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);
return 0;
}
@ -108,7 +99,11 @@ static int __init my_init(void) {
* @brief This function is called, when the module is removed from the kernel
*/
static void __exit my_exit(void) {
printk("dt_gpio - Unload driver");
printk("counter - Unload driver");
printk("counter - red led off\n");
gpiod_set_value(red_led, 0);
platform_driver_unregister(&my_driver);
}