freebsd-dev/sys/dev/spibus/spibus.c

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/kernel.h>
#include <sys/queue.h>
#include <sys/sysctl.h>
#include <sys/types.h>

#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>

#include <dev/spibus/spibusvar.h>
#include <dev/spibus/spi.h>
#include "spibus_if.h"

static int
spibus_probe(device_t dev)
{
	device_set_desc(dev, "spibus bus");
	return (0);
}

static int
spibus_attach(device_t dev)
{
	struct spibus_softc *sc = SPIBUS_SOFTC(dev);

	sc->dev = dev;
	bus_enumerate_hinted_children(dev);
	return (bus_generic_attach(dev));
}

/*
 * Since this is not a self-enumerating bus, and since we always add
 * children in attach, we have to always delete children here.
 */
static int
spibus_detach(device_t dev)
{
	int err, ndevs, i;
	device_t *devlist;

	if ((err = bus_generic_detach(dev)) != 0)
		return (err);
	if ((err = device_get_children(dev, &devlist, &ndevs)) != 0)
		return (err);
	for (i = 0; i < ndevs; i++)
		device_delete_child(dev, devlist[i]);
	free(devlist, M_TEMP);

	return (0);
}

static int
spibus_suspend(device_t dev)
{
	return (bus_generic_suspend(dev));
}

static
int
spibus_resume(device_t dev)
{
	return (bus_generic_resume(dev));
}

static int
spibus_print_child(device_t dev, device_t child)
{
	struct spibus_ivar *devi = SPIBUS_IVAR(child);
	int retval = 0;

	retval += bus_print_child_header(dev, child);
	retval += printf(" at cs %d", devi->cs);
	retval += bus_print_child_footer(dev, child);

	return (retval);
}

static void
spibus_probe_nomatch(device_t bus, device_t child)
{
	struct spibus_ivar *devi = SPIBUS_IVAR(child);

	device_printf(bus, "<unknown card>");
	printf(" at cs %d\n", devi->cs);
	return;
}

static int
spibus_child_location_str(device_t bus, device_t child, char *buf,
    size_t buflen)
{
	struct spibus_ivar *devi = SPIBUS_IVAR(child);

	snprintf(buf, buflen, "cs=%d", devi->cs);
	return (0);
}

static int
spibus_child_pnpinfo_str(device_t bus, device_t child, char *buf,
    size_t buflen)
{
	*buf = '\0';
	return (0);
}

static int
spibus_read_ivar(device_t bus, device_t child, int which, u_int *result)
{
	struct spibus_ivar *devi = SPIBUS_IVAR(child);

	switch (which) {
	default:
		return (EINVAL);
	case SPIBUS_IVAR_CS:
		*(uint32_t *)result = devi->cs;
		break;
	}
	return (0);
}

static device_t
spibus_add_child(device_t dev, u_int order, const char *name, int unit)
{
	device_t child;
	struct spibus_ivar *devi;

	child = device_add_child_ordered(dev, order, name, unit);
	if (child == NULL) 
		return (child);
	devi = malloc(sizeof(struct spibus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO);
	if (devi == NULL) {
		device_delete_child(dev, child);
		return (0);
	}
	device_set_ivars(child, devi);
	return (child);
}

static void
spibus_hinted_child(device_t bus, const char *dname, int dunit)
{
	device_t child;
	struct spibus_ivar *devi;

	child = BUS_ADD_CHILD(bus, 0, dname, dunit);
	devi = SPIBUS_IVAR(child);
	resource_int_value(dname, dunit, "cs", &devi->cs);
}

static int
spibus_transfer_impl(device_t dev, device_t child, struct spi_command *cmd)
{
	return (SPIBUS_TRANSFER(device_get_parent(dev), child, cmd));
}

static device_method_t spibus_methods[] = {
	/* Device interface */
	DEVMETHOD(device_probe,		spibus_probe),
	DEVMETHOD(device_attach,	spibus_attach),
	DEVMETHOD(device_detach,	spibus_detach),
	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
	DEVMETHOD(device_suspend,	spibus_suspend),
	DEVMETHOD(device_resume,	spibus_resume),

	/* Bus interface */
	DEVMETHOD(bus_add_child,	spibus_add_child),
	DEVMETHOD(bus_print_child,	spibus_print_child),
	DEVMETHOD(bus_driver_added,	bus_generic_driver_added),
	DEVMETHOD(bus_probe_nomatch,	spibus_probe_nomatch),
	DEVMETHOD(bus_read_ivar,	spibus_read_ivar),
	DEVMETHOD(bus_child_pnpinfo_str, spibus_child_pnpinfo_str),
	DEVMETHOD(bus_child_location_str, spibus_child_location_str),
	DEVMETHOD(bus_hinted_child,	spibus_hinted_child),

	/* spibus interface */
	DEVMETHOD(spibus_transfer,	spibus_transfer_impl),

	{ 0, 0 }
};

static driver_t spibus_driver = {
	"spibus",
	spibus_methods,
	sizeof(struct spibus_softc)
};

devclass_t	spibus_devclass;

DRIVER_MODULE(spibus, spi, spibus_driver, spibus_devclass, 0, 0);
MODULE_VERSION(spibus, 1);