Configure a GPIO pin for interrupt

[Siva]

Hi,

 

I am new to Wandboard. I would like to configure a GPIO pin for interrupt. When i receive the interrupt i would like to read the data on GPIO.

 

Please let me know what are all the modifications that i need to do for Kernel and how can i read from user space.

 

Any sample code would be more helpful for better understanding.

 

Thanks,

Siva

[Jorge Rodriguez]

Hello,

here is a code abstract of what you have to keep on mind for gpio, irq mapping. I developed this code for other board, but you know.... it's Linux.

Once that you get it to work on Wandboard, could you provide us with the code?

    u16     irq, irq_pin, gpio_pin0;
   
    void* addr = ioremap( <port config address> , 4); // map the i/o addresses to kernel high memory
    iowrite32( <port config> , addr);       // write settings for each pin
    iounmap(addr);
     
    irq_pin = <port number>;
    gpio_pin0 = <irq pin number>;
   
    gpio_request_one(gpio_pin0, GPIOF_IN, DRV_NAME " gpio");
    gpio_request_one(irq_pin, GPIOF_IN, DRV_NAME " irq");
    irq = (u16)gpio_to_irq(stTestData.irq_pin);;

    gpio_get_value(gpio_pin0);  // Read gpio
    request_any_context_irq( irq, <ISR function> , IRQF_TRIGGER_FALLING | IRQF_DISABLED, DRV_NAME, (void*)&stTestData );  // Configure ISR
   
    if (!stTestData.irq_enabled)
        enable_irq(stTestData.irq);

   gpio_free(stTestData.gpio_pin0);
   gpio_free(stTestData.irq_pin);

Regards,
Jorge.

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