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/* $OpenBSD: gpioow.c,v 1.6 2022/04/06 18:59:28 naddy Exp $ */
/*
* Copyright (c) 2006 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.
*/
/*
* 1-Wire bus bit-banging through GPIO pin.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/gpio.h>
#include <dev/gpio/gpiovar.h>
#include <dev/onewire/onewirevar.h>
#define GPIOOW_NPINS 1
#define GPIOOW_PIN_DATA 0
struct gpioow_softc {
struct device sc_dev;
void * sc_gpio;
struct gpio_pinmap sc_map;
int __map[GPIOOW_NPINS];
struct onewire_bus sc_ow_bus;
struct device * sc_ow_dev;
int sc_data;
int sc_dying;
};
int gpioow_match(struct device *, void *, void *);
void gpioow_attach(struct device *, struct device *, void *);
int gpioow_detach(struct device *, int);
int gpioow_activate(struct device *, int);
int gpioow_ow_reset(void *);
int gpioow_ow_bit(void *, int);
void gpioow_bb_rx(void *);
void gpioow_bb_tx(void *);
int gpioow_bb_get(void *);
void gpioow_bb_set(void *, int);
const struct cfattach gpioow_ca = {
sizeof(struct gpioow_softc),
gpioow_match,
gpioow_attach,
gpioow_detach,
gpioow_activate
};
struct cfdriver gpioow_cd = {
NULL, "gpioow", DV_DULL
};
static const struct onewire_bbops gpioow_bbops = {
gpioow_bb_rx,
gpioow_bb_tx,
gpioow_bb_get,
gpioow_bb_set
};
int
gpioow_match(struct device *parent, void *match, void *aux)
{
struct cfdata *cf = match;
struct gpio_attach_args *ga = aux;
if (ga->ga_offset == -1)
return 0;
return (strcmp(cf->cf_driver->cd_name, "gpioow") == 0);
}
void
gpioow_attach(struct device *parent, struct device *self, void *aux)
{
struct gpioow_softc *sc = (struct gpioow_softc *)self;
struct gpio_attach_args *ga = aux;
struct onewirebus_attach_args oba;
int caps;
/* Check that we have enough pins */
if (gpio_npins(ga->ga_mask) != GPIOOW_NPINS) {
printf(": invalid pin mask\n");
return;
}
/* Map pins */
sc->sc_gpio = ga->ga_gpio;
sc->sc_map.pm_map = sc->__map;
if (gpio_pin_map(sc->sc_gpio, ga->ga_offset, ga->ga_mask,
&sc->sc_map)) {
printf(": can't map pins\n");
return;
}
/* Configure data pin */
caps = gpio_pin_caps(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA);
if (!(caps & GPIO_PIN_OUTPUT)) {
printf(": data pin is unable to drive output\n");
goto fail;
}
if (!(caps & GPIO_PIN_INPUT)) {
printf(": data pin is unable to read input\n");
goto fail;
}
printf(": DATA[%d]", sc->sc_map.pm_map[GPIOOW_PIN_DATA]);
sc->sc_data = GPIO_PIN_OUTPUT;
if (caps & GPIO_PIN_OPENDRAIN) {
printf(" open-drain");
sc->sc_data |= GPIO_PIN_OPENDRAIN;
} else if ((caps & GPIO_PIN_PUSHPULL) && (caps & GPIO_PIN_TRISTATE)) {
printf(" push-pull tri-state");
sc->sc_data |= GPIO_PIN_PUSHPULL;
}
if (caps & GPIO_PIN_PULLUP) {
printf(" pull-up");
sc->sc_data |= GPIO_PIN_PULLUP;
}
gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA, sc->sc_data);
printf("\n");
/* Attach 1-Wire bus */
sc->sc_ow_bus.bus_cookie = sc;
sc->sc_ow_bus.bus_reset = gpioow_ow_reset;
sc->sc_ow_bus.bus_bit = gpioow_ow_bit;
bzero(&oba, sizeof(oba));
oba.oba_bus = &sc->sc_ow_bus;
sc->sc_ow_dev = config_found(self, &oba, onewirebus_print);
return;
fail:
gpio_pin_unmap(sc->sc_gpio, &sc->sc_map);
}
int
gpioow_detach(struct device *self, int flags)
{
struct gpioow_softc *sc = (struct gpioow_softc *)self;
int rv = 0;
gpio_pin_unmap(sc->sc_gpio, &sc->sc_map);
if (sc->sc_ow_dev != NULL)
rv = config_detach(sc->sc_ow_dev, flags);
return (rv);
}
int
gpioow_activate(struct device *self, int act)
{
struct gpioow_softc *sc = (struct gpioow_softc *)self;
int rv = 0;
switch (act) {
case DVACT_DEACTIVATE:
sc->sc_dying = 1;
if (sc->sc_ow_dev != NULL)
rv = config_deactivate(sc->sc_ow_dev);
break;
}
return (rv);
}
int
gpioow_ow_reset(void *arg)
{
return (onewire_bb_reset(&gpioow_bbops, arg));
}
int
gpioow_ow_bit(void *arg, int value)
{
return (onewire_bb_bit(&gpioow_bbops, arg, value));
}
void
gpioow_bb_rx(void *arg)
{
struct gpioow_softc *sc = arg;
int data = sc->sc_data;
data &= ~(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_TRISTATE);
data |= GPIO_PIN_INPUT;
if (data & GPIO_PIN_PUSHPULL)
data |= GPIO_PIN_TRISTATE;
if (sc->sc_data != data) {
sc->sc_data = data;
gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA,
sc->sc_data);
}
}
void
gpioow_bb_tx(void *arg)
{
struct gpioow_softc *sc = arg;
int data = sc->sc_data;
data &= ~(GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | GPIO_PIN_TRISTATE);
data |= GPIO_PIN_OUTPUT;
if (sc->sc_data != data) {
sc->sc_data = data;
gpio_pin_ctl(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA,
sc->sc_data);
}
}
int
gpioow_bb_get(void *arg)
{
struct gpioow_softc *sc = arg;
return (gpio_pin_read(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA) ==
GPIO_PIN_HIGH ? 1 : 0);
}
void
gpioow_bb_set(void *arg, int value)
{
struct gpioow_softc *sc = arg;
gpio_pin_write(sc->sc_gpio, &sc->sc_map, GPIOOW_PIN_DATA,
value ? GPIO_PIN_HIGH : GPIO_PIN_LOW);
}
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