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Initial revision

/*	$Id: spi.c,v 1.1 2008/03/04 16:09:35 nbrk Exp $	*/
/*
 * SPI bus.
 */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/rwlock.h>

#include <dev/spivar.h>

struct spi_softc {
	struct device	sc_dev;
	struct spi_bus	*sc_bus;
};

int	spi_match(struct device *parent, void *cf, void *aux);
void	spi_attach(struct device *parent, struct device *self, void *aux);

struct cfattach	spibus_ca = {
	sizeof(struct spi_softc),
	spi_match,
	spi_attach,
	NULL,
	NULL
};

struct cfdriver	spibus_cd = {
	NULL,
	"spibus",
	DV_DULL
};


int
spi_match(struct device *parent, void *cf, void *aux)
{
	return(1);
}

void
spi_attach(struct device *parent, struct device *self, void *aux)
{
	struct spi_softc *sc = (struct spi_softc *)self;
	struct spibus_attach_args *sba = aux;

	sc->sc_bus = sba->sba_bus;
	sba->sba_spisc = sc;

	printf("\n");

	/* attach slave */
	config_found(&sc->sc_dev, sba, spibus_print);
}

int
spibus_print(void *aux, const char *pnp)
{
	return(QUIET);
}

int
spi_shift_1(void *arg, uint8_t data)
{
	struct spi_softc *sc = arg;
	struct spi_bus *sb = sc->sc_bus;

	/*
	 * TODO: locking.
	 */

	return(sb->bus_shift_1(sb->bus_cookie, data));
}

int
spi_acquire(void *arg)
{
	struct spi_softc *sc = arg;
	struct spi_bus *sb = sc->sc_bus;

	return(sb->bus_acquire(sb->bus_cookie));
}

void
spi_release(void *arg)
{
	struct spi_softc *sc = arg;
	struct spi_bus *sb = sc->sc_bus;

	return(sb->bus_release(sb->bus_cookie));
}