/*
 * $Id: gpio.h,v 1.1 2007/11/15 20:32:32 nbrk Exp $
 */
#ifndef _SYS_GPIO_H
#define _SYS_GPIO_H

#include <sys/types.h>

/*
 * General Purpose Input/Output
 */

/* gpio pin flags */
#define GPIO_PIN_INPUT 		0x00 /* configured as input */
#define GPIO_PIN_OUTPUT 	0x01 /* configured as output */


struct gpio_pin {
	uint32_t 	gp_pinno; 	/* pin number */

	uint8_t 	gp_pio; 	/* driven by PIO (1) or by Peripherals (0) */
	uint8_t 	gp_flags; 	/* pin flags */	
	uint8_t 	gp_value; 	/* pin value (0 or 1) */
};


/* each gpio controller should provide us with this */
struct gpio_controller {
	uint8_t 		(*gc_pinread)(void *selfdd, uint32_t pin);
	void 			(*gc_pinwrite)(void *selfdd, uint32_t pin, uint8_t data);
	void 			(*gc_pinset)(void *selfdd, struct gpio_pin state);
	struct gpio_pin	(*gc_pinget)(void *selfdd, uint32_t pin);

	uint32_t 		gc_npins; 	/* total number of pins */

	void 			*gc_selfdd; /* controller's dv_devdata */
};

#endif /* not _SYS_GPIO_H */