Dallas 1-Wire bus support. Includes the following drivers:

gpioow(4)	1-Wire bus bit-banging through GPIO pin
onewire(4)	1-Wire bus driver
owid(4)		1-Wire ID family type device
owtemp(4)	1-Wire temperature family type device

Drivers for RS-232 and USB bus masters will follow.

ok deraadt@

2 files changed, 251 insertions, 1 deletions

diff --git a/sys/dev/gpio/files.gpio b/sys/dev/gpio/files.gpio
index add5a0cbe11..79fd80d3a03 100644
--- a/sys/dev/gpio/files.gpio
+++ b/sys/dev/gpio/files.gpio
@@ -1,4 +1,4 @@
-# $OpenBSD: files.gpio,v 1.5 2006/01/14 13:55:14 grange Exp $
+# $OpenBSD: files.gpio,v 1.6 2006/03/04 16:27:03 grange Exp $
 
 define	gpio {offset, mask}
 
@@ -10,3 +10,8 @@ file	dev/gpio/gpio.c				gpio	needs-flag
 device	gpioiic: i2cbus, i2c_bitbang
 attach	gpioiic at gpio
 file	dev/gpio/gpioiic.c			gpioiic
+
+# 1-Wire bus bit-banging
+device	gpioow: onewirebus, onewire_bitbang
+attach	gpioow at gpio
+file	dev/gpio/gpioow.c			gpioow
diff --git a/sys/dev/gpio/gpioow.c b/sys/dev/gpio/gpioow.c
new file mode 100644
index 00000000000..94364133eef
--- /dev/null
+++ b/sys/dev/gpio/gpioow.c
@@ -0,0 +1,245 @@
+/*	$OpenBSD: gpioow.c,v 1.1 2006/03/04 16:27:03 grange 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 *, enum devact);
+
+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);
+
+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;
+
+	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;
+
+	if (sc->sc_ow_dev != NULL)
+		rv = config_detach(sc->sc_ow_dev, flags);
+
+	return (rv);
+}
+
+int
+gpioow_activate(struct device *self, enum devact act)
+{
+	struct gpioow_softc *sc = (struct gpioow_softc *)self;
+	int rv = 0;
+
+	switch (act) {
+	case DVACT_ACTIVATE:
+		return (EOPNOTSUPP);
+	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);
+}