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/*
 * Driver for the ST LIS331 MEMS accelerometer
 */

#include <sys/ioctl.h>

#define _LIS331BASE	0x6900
#define LIS331C(_x)	_IOC(_LIS331BASE, _x)

/* 
 * Sets the sensor internal sampling rate, and if a buffer
 * has been configured, the rate at which entries will be
 * added to the buffer.
 */
#define LIS331_SETRATE		LIS331C(1)

#define LIS331_RATE_50Hz		(0<<3)
#define LIS331_RATE_100Hz		(1<<3)
#define LIS331_RATE_400Hz		(2<<3)
#define LIS331_RATE_1000Hz		(3<<3)

/*
 * Sets the sensor internal range.
 */
#define LIS331_SETRANGE		LIS331C(2)

#define LIS331_RANGE_2G			(0<<4)
#define LIS331_RANGE_4G			(1<<4)
#define LIS331_RANGE_8G			(3<<4)

/*
 * Sets the address of a shared lis331_buffer
 * structure that is maintained by the driver.
 *
 * If zero is passed as the address, disables
 * the buffer updating.
 */
#define LIS331_SETBUFFER	LIS331C(3)

struct lis331_buffer {
	uint32_t	size;		/* number of entries in the samples[] array */
	uint32_t	next;		/* the next entry that will be populated */
	struct {
		uint16_t	x;
		uint16_t	y;
		uint16_t	z;
	} samples[];
};

extern int	lis331_attach(struct spi_dev_s *spi, int spi_id);