Simple AT91SAM9260 Driver

["Paul Kavan" <pkavan@xxxxxxxxx>]

Hello All:

I am continuing to write my simple driver. I have been able to get the
basics down. I have a very simple driver right now that
initializes/exits with a message. I have also set it up so that it
defines the user buttons as gpio inputs and the user led as a gpio
output. I have fiddled with it to light the led when the module is
inserted, just to make sure I could.

I am now trying to set the two user buttons as interrupts and have
them turn the led on/off with the button presses. According to gpio.c,
I need to do the following:

/* Several AIC controller irqs are dispatched through this GPIO handler.
* To use any AT91_PIN_* as an externally triggered IRQ, first call
* at91_set_gpio_input() then maybe enable its glitch filter.
* Then just request_irq() with the pin ID; it works like any ARM IRQ
* handler, though it always triggers on rising and falling edges.
*
* Alternatively, certain pins may be used directly as IRQ0..IRQ6 after
* configuring them with at91_set_a_periph() or at91_set_b_periph().
* IRQ0..IRQ6 should be configurable, e.g. level vs edge triggering.
*/

I think I have to first couple of tasks done, but am unsure on the
third (i.e. request_irq() )

My code thus far looks like:


/--------BEGINNING OF CODE------------/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <asm/arch/gpio.h>

MODULE_LICENSE("Dual BSD/GPL");

#define DRIVER_NAME "Buttontest_module"

static int buttontest_init(void)
{
 printk(KERN_INFO "\n\n%s loaded!\n\n\n", DRIVER_NAME);

 //Define User Buttons as inputs and User LED as output
 at91_set_gpio_input(AT91_PIN_PA30,0);
 at91_set_gpio_input(AT91_PIN_PA31,0);
 at91_set_gpio_output(AT91_PIN_PA6,1);

 //Set glitch filter on buttons
 at91_set_deglitch(AT91_PIN_PA30,1);
 at91_set_deglitch(AT91_PIN_PA31,1);

 //Request IRQ's for the buttons
 //This is where I am stuck



 return 0;
}

static void buttontest_exit(void)
{
 printk(KERN_INFO "\n\n%s unloaded!\n\n\n", DRIVER_NAME);
}

module_init(buttontest_init);
module_exit(buttontest_exit);

/---------END OF CODE-----------------------------/

Does anyone have advice and or suggestions?

Thanks.

Paul

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