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/*-
* Copyright (c) 2018 Stormshield
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h> /* defines used in kernel.h */
#include <sys/module.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/kernel.h> /* types used in module initialization */
#include <sys/conf.h> /* cdevsw struct */
#include <sys/uio.h> /* uio struct */
#include <sys/malloc.h>
#include <sys/bus.h> /* structs, prototypes for pci bus stuff and DEVMETHOD macros! */
#include <sys/gpio.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
#include <dev/gpio/gpiobusvar.h>
#include "gpio_if.h"
#include "lewisburg_gpiocm.h"
#define P2SB_GROUP_GPIO_MAX_PINS 24
struct lbggpio_softc
{
device_t sc_busdev;
int groupid;
int pins_off;
int npins;
char grpname;
struct gpio_pin gpio_setup[P2SB_GROUP_GPIO_MAX_PINS];
};
static device_t
lbggpio_get_bus(device_t dev)
{
struct lbggpio_softc *sc;
sc = device_get_softc(dev);
return (sc->sc_busdev);
}
static int
lbggpio_pin_max(device_t dev, int *maxpin)
{
struct lbggpio_softc *sc;
if (maxpin == NULL)
return (EINVAL);
sc = device_get_softc(dev);
*maxpin = sc->npins - 1;
return (0);
}
static int
lbggpio_pin_getname(device_t dev, uint32_t pin, char *name)
{
struct lbggpio_softc *sc = device_get_softc(dev);
if (name == NULL)
return (EINVAL);
if (pin >= sc->npins)
return (EINVAL);
strlcpy(name, sc->gpio_setup[pin].gp_name, GPIOMAXNAME);
return (0);
}
static int
lbggpio_pin_getflags(device_t dev, uint32_t pin, uint32_t *flags)
{
struct lbggpio_softc *sc = device_get_softc(dev);
if (flags == NULL)
return (EINVAL);
if (pin >= sc->npins)
return (EINVAL);
*flags = sc->gpio_setup[pin].gp_flags;
return (0);
}
static int
lbggpio_pin_getcaps(device_t dev, uint32_t pin, uint32_t *caps)
{
struct lbggpio_softc *sc = device_get_softc(dev);
if (caps == NULL)
return (EINVAL);
if (pin >= sc->npins)
return (EINVAL);
*caps = sc->gpio_setup[pin].gp_caps;
return (0);
}
static int
lbggpio_pin_setflags(device_t dev, uint32_t pin, uint32_t flags)
{
struct lbggpio_softc *sc = device_get_softc(dev);
if (pin >= sc->npins)
return (EINVAL);
/* Check for unwanted flags. */
if ((flags & sc->gpio_setup[pin].gp_caps) != flags)
return (EINVAL);
lbggpiocm_pin_setflags(device_get_parent(dev), dev, pin, flags);
sc->gpio_setup[pin].gp_flags = flags;
return (0);
}
static int
lbggpio_pin_get(device_t dev, uint32_t pin, uint32_t *value)
{
struct lbggpio_softc *sc = device_get_softc(dev);
if (value == NULL)
return (EINVAL);
if (pin >= sc->npins)
return (EINVAL);
return (lbggpiocm_pin_get(device_get_parent(dev), dev, pin, value));
}
static int
lbggpio_pin_set(device_t dev, uint32_t pin, uint32_t value)
{
struct lbggpio_softc *sc = device_get_softc(dev);
if (pin >= sc->npins)
return (EINVAL);
return (lbggpiocm_pin_set(device_get_parent(dev), dev, pin, value));
}
static int
lbggpio_pin_toggle(device_t dev, uint32_t pin)
{
struct lbggpio_softc *sc = device_get_softc(dev);
if (pin >= sc->npins)
return (EINVAL);
return (lbggpiocm_pin_toggle(device_get_parent(dev), dev, pin));
}
static int
lbggpio_probe(device_t dev)
{
struct lbggpio_softc *sc = device_get_softc(dev);
/* X is a placeholder for the actual one letter group name. */
static char desc[] = "LewisBurg GPIO Group X";
sc->npins = lbggpiocm_get_group_npins(device_get_parent(dev), dev);
sc->grpname = lbggpiocm_get_group_name(device_get_parent(dev), dev);
if (sc->npins <= 0)
return (ENXIO);
desc[sizeof(desc)-2] = sc->grpname;
device_set_desc_copy(dev, desc);
return (BUS_PROBE_DEFAULT);
}
static int
lbggpio_attach(device_t dev)
{
uint32_t i;
struct lbggpio_softc *sc;
sc = device_get_softc(dev);
/* GPIO config */
for (i = 0; i < sc->npins; ++i) {
sc->gpio_setup[i].gp_pin = i;
snprintf(sc->gpio_setup[i].gp_name,
sizeof(sc->gpio_setup[i].gp_name),
"GPIO %c%u", sc->grpname, i);
sc->gpio_setup[i].gp_caps = GPIO_PIN_INPUT | GPIO_PIN_OUTPUT;
}
/* support gpio */
sc->sc_busdev = gpiobus_add_bus(dev);
if (sc->sc_busdev == NULL)
return (ENXIO);
bus_attach_children(dev);
return (0);
}
static int
lbggpio_detach(device_t dev)
{
struct lbggpio_softc *sc;
sc = device_get_softc(dev);
if (sc->sc_busdev)
gpiobus_detach_bus(dev);
return (0);
}
static device_method_t lbggpio_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, lbggpio_probe),
DEVMETHOD(device_attach, lbggpio_attach),
DEVMETHOD(device_detach, lbggpio_detach),
/* GPIO protocol */
DEVMETHOD(gpio_get_bus, lbggpio_get_bus),
DEVMETHOD(gpio_pin_max, lbggpio_pin_max),
DEVMETHOD(gpio_pin_getcaps, lbggpio_pin_getcaps),
DEVMETHOD(gpio_pin_getflags, lbggpio_pin_getflags),
DEVMETHOD(gpio_pin_setflags, lbggpio_pin_setflags),
DEVMETHOD(gpio_pin_getname, lbggpio_pin_getname),
DEVMETHOD(gpio_pin_set, lbggpio_pin_set),
DEVMETHOD(gpio_pin_get, lbggpio_pin_get),
DEVMETHOD(gpio_pin_toggle, lbggpio_pin_toggle),
DEVMETHOD_END
};
static driver_t lbggpio_driver = {
"gpio",
lbggpio_methods,
sizeof(struct lbggpio_softc)
};
DRIVER_MODULE(lbggpio, lbggpiocm, lbggpio_driver, NULL, NULL);
MODULE_DEPEND(lbggpio, gpiobus, 1, 1, 1);
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