Error on request_irq() - Orange Pie

[João Paulo Bodanese]

Hello,

 

I'm trying to use pin PC3 as an interrupt, but it returns the error code -22 in the gpio_to_irq() function. In user-space i can use it normally as a GPIO, but I need it to function as an interrupt in a driver.

Board: Orange Pi One, Armbian 23.8.0

 

#define GPIO_PIN 67
#define GPIO_PIN_DESC "GPIO PC3"

static int __init mytapp_controller_proc_init(void)
{
	int ret,gpio_irq;

	uint8_t idx = 0;

	printk("mytapp_controller_proc_init 444%d\n",GPIO_PIN);

	msg = kmalloc(PROCFS_MAX_SIZE, GFP_KERNEL);
	if(!msg){
		printk(KERN_ALERT "Error: kmalloc error\n");
		return -ENOMEM;
	}

   if (gpio_request(GPIO_PIN, GPIO_PIN_DESC)) {
      printk("GPIO request failure: %s\n", GPIO_PIN_DESC);
      return -1;
   }

   if (gpio_direction_input(GPIO_PIN)) {
      printk("GPIO set direction input failure %s\n", GPIO_PIN_DESC);
      return -1;
   }
 
   if ( (gpio_irq = gpio_to_irq(GPIO_PIN)) < 0 ) {
      printk("GPIO to IRQ mapping failure %s\n", GPIO_PIN_DESC);
      return -1;
   }

    ret = request_irq(gpio_irq, sample_irq, IRQF_TRIGGER_FALLING, "flow_sensor", 0);
    if (ret < 0) {
        printk(KERN_ALERT "%s: request_irg failed with %u\n", __func__, ret);
        return -1;
    }

   return 0;
}

 

 

It shows as GPIO IN:

 

root@orangepione:/home/mytapp# cat /sys/kernel/debug/gpio
gpiochip0: GPIOs 0-223, parent: platform/1c20800.pinctrl, 1c20800.pinctrl:
 gpio-15  (                    |orangepi:red:status ) out lo 
 gpio-67  (                    |GPIO PC3            ) in  hi 
 gpio-166 (                    |cd                  ) in  lo ACTIVE LOW
 gpio-204 (                    |usb0_id_det         ) in  hi IRQ 

gpiochip1: GPIOs 352-383, parent: platform/1f02c00.pinctrl, 1f02c00.pinctrl:
 gpio-354 (                    |usb0-vbus           ) out hi 
 gpio-355 (                    |sw4                 ) in  hi IRQ ACTIVE LOW
 gpio-358 (                    |vdd-cpux            ) out lo 
 gpio-362 (                    |orangepi:green:pwr  ) out hi 

 

I also tryied PC0 and doesn't work too. The PA3 and works fine.

 

Any ideia?

Best regards

 

Edited July 10, 2023 by João Paulo Bodanese

[João Paulo Bodanese]

The Orange Pi One uses the Allwinner H3, and according to its datasheet only the PA and PG pins support EINT.