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/* $OpenBSD: gpio.c,v 1.1 2004/06/03 18:08:00 grange Exp $ */
/*
* Copyright (c) 2004 Alexander Yurchenko <grange@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* General Purpose I/O framework.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/gpio.h>
#include <dev/gpio/gpiovar.h>
struct gpio_softc {
struct device sc_dev;
gpio_chipset_tag_t sc_gc; /* our GPIO controller */
gpio_pin_t *sc_pins; /* pins array */
int sc_npins; /* total number of pins */
int sc_opened;
};
int gpio_match(struct device *, void *, void *);
void gpio_attach(struct device *, struct device *, void *);
int gpio_search(struct device *, void *, void *);
int gpio_print(void *, const char *);
struct cfattach gpio_ca = {
sizeof (struct gpio_softc),
gpio_match,
gpio_attach
};
struct cfdriver gpio_cd = {
NULL, "gpio", DV_DULL
};
int
gpio_match(struct device *parent, void *match, void *aux)
{
struct cfdata *cf = match;
struct gpiobus_attach_args *gba = aux;
if (strcmp(gba->gba_name, cf->cf_driver->cd_name) != 0)
return (0);
return (1);
}
void
gpio_attach(struct device *parent, struct device *self, void *aux)
{
struct gpio_softc *sc = (struct gpio_softc *)self;
struct gpiobus_attach_args *gba = aux;
sc->sc_gc = gba->gba_gc;
sc->sc_pins = gba->gba_pins;
sc->sc_npins = gba->gba_npins;
printf(": %d pins\n", sc->sc_npins);
/*
* Attach all devices that can be connected to the GPIO pins
* described in the kernel configuration file.
*/
config_search(gpio_search, self, NULL);
}
int
gpio_search(struct device *parent, void *arg, void *aux)
{
struct cfdata *cf = arg;
struct gpio_attach_args ga;
ga.ga_pin = cf->cf_loc[0];
ga.ga_mask = cf->cf_loc[1];
if (cf->cf_attach->ca_match(parent, cf, &ga) > 0)
config_attach(parent, cf, &ga, gpio_print);
return (0);
}
int
gpio_print(void *aux, const char *pnp)
{
struct gpio_attach_args *ga = aux;
int i;
printf(" pins");
for (i = 0; i < 32; i++)
if (ga->ga_mask & (1 << i))
printf(" %d", ga->ga_pin + i);
return (UNCONF);
}
int
gpiobus_print(void *aux, const char *pnp)
{
struct gpiobus_attach_args *gba = aux;
if (pnp != NULL)
printf("%s at %s", gba->gba_name, pnp);
return (UNCONF);
}
int
gpioopen(dev_t dev, int flag, int mode, struct proc *p)
{
struct gpio_softc *sc;
sc = (struct gpio_softc *)device_lookup(&gpio_cd, minor(dev));
if (sc == NULL)
return (ENXIO);
if (sc->sc_opened)
return (EBUSY);
sc->sc_opened = 1;
return (0);
}
int
gpioclose(dev_t dev, int flag, int mode, struct proc *p)
{
struct gpio_softc *sc;
sc = (struct gpio_softc *)device_lookup(&gpio_cd, minor(dev));
sc->sc_opened = 0;
return (0);
}
int
gpioioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
{
struct gpio_softc *sc;
gpio_chipset_tag_t gc;
struct gpio_info *info;
struct gpio_pin_op *op;
struct gpio_pin_ctl *ctl;
int pin, value, flags;
sc = (struct gpio_softc *)device_lookup(&gpio_cd, minor(dev));
gc = sc->sc_gc;
switch (cmd) {
case GPIOINFO:
info = (struct gpio_info *)data;
info->gpio_npins = sc->sc_npins;
break;
case GPIOPINREAD:
op = (struct gpio_pin_op *)data;
pin = op->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return (EINVAL);
/* return read value */
op->gp_value = gpiobus_pin_read(gc, pin);
break;
case GPIOPINWRITE:
op = (struct gpio_pin_op *)data;
pin = op->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return (EINVAL);
value = op->gp_value;
if (value != GPIO_PIN_LOW && value != GPIO_PIN_HIGH)
return (EINVAL);
gpiobus_pin_write(gc, pin, value);
/* return old value */
op->gp_value = sc->sc_pins[pin].pin_state;
/* update current value */
sc->sc_pins[pin].pin_state = value;
break;
case GPIOPINTOGGLE:
op = (struct gpio_pin_op *)data;
pin = op->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return (EINVAL);
value = (sc->sc_pins[pin].pin_state == GPIO_PIN_LOW ?
GPIO_PIN_HIGH : GPIO_PIN_LOW);
gpiobus_pin_write(gc, pin, value);
/* return old value */
op->gp_value = sc->sc_pins[pin].pin_state;
/* update current value */
sc->sc_pins[pin].pin_state = value;
break;
case GPIOPINCTL:
ctl = (struct gpio_pin_ctl *)data;
pin = ctl->gp_pin;
if (pin < 0 || pin >= sc->sc_npins)
return (EINVAL);
flags = ctl->gp_flags;
/* check that the controller supports all requested flags */
if ((flags & sc->sc_pins[pin].pin_caps) != flags)
return (ENODEV);
ctl->gp_caps = sc->sc_pins[pin].pin_caps;
/* return old value */
ctl->gp_flags = sc->sc_pins[pin].pin_flags;
if (flags > 0) {
gpiobus_pin_ctl(gc, pin, flags);
/* update current value */
sc->sc_pins[pin].pin_flags = flags;
}
break;
default:
return (ENOTTY);
}
return (0);
}
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