OSK5912 GPIO

Dear all,

I AM WORKING ON OMAP5912 OSK

I am trying to write a simple GPIO program to change the state of a gpio pin.

For that I am using the gpio-switch.c located at linux/arch/arm/plat-omap.

In the gpio-switch.c program I included the follwing function

#define LED_GPIO 23

static int led_glow()

{
	/* requesting for LED_GPIO */
	
      if(omap_request_gpio(LED_GPIO)<0)
		return -1;
	
	/* setting LED_GPIO as output pin */
	omap_set_gpio_direction(LED_GPIO,0);

	/* writing to LED_GPIO the state of KEY_UP */

	omap_set_gpio_dataout(LED_GPIO,1);

	/* printing the value of led_gpio pin */

printk("value of pin # %d =
%d\n",LED_GPIO,omap_get_gpio_datain(LED_GPIO));

	return 0;

}

I am calling the function "led_glow()" again in the following function

static int __init gpio_sw_init(void)

{
	int r;

	printk(KERN_INFO "OMAP GPIO switch handler

initializing\n");

	r = driver_register(&gpio_sw_driver);
	if (r)
		return r;

	gpio_sw_platform_dev =
platform_device_register_simple("gpio-switch",
							       -1, NULL, 0);
	if (IS_ERR(gpio_sw_platform_dev)) {
		driver_unregister(&gpio_sw_driver);
		return PTR_ERR(gpio_sw_platform_dev);
	}

	r = add_atag_switches();
	if (r < 0) {
		platform_device_unregister(gpio_sw_platform_dev);
		driver_unregister(&gpio_sw_driver);
		gpio_sw_cleanup();
		return r;
	}

	report_initial_state();

	return 0;
        led_glow();

}

I complied and ported this to OSK5912

But I am getting neither the print statement nor the response at the gpio pin 23 in the C.R.O.

Even I changed the various gpio pins and tried I could not see any response in the C.R.O

Please help me by an example code.

Regards

Azhar

Bring your gang together - do your thing. Go to http://in.promos.yahoo.com/groups

'return' exits the function. led_glow() will never be called. I'd recommend consulting some books on C (e.g. the C Programming Language by Kernigan and Ritchie) before continuing much further, to be honest.

Cheers,
Daniel