driver for the philips pca9554 i2c gpio device

1 files changed, 256 insertions, 0 deletions

diff --git a/sys/dev/i2c/pca9554.c b/sys/dev/i2c/pca9554.c
new file mode 100644
index 00000000000..22cd953e7fe
--- /dev/null
+++ b/sys/dev/i2c/pca9554.c
@@ -0,0 +1,256 @@
+/*	$OpenBSD: pca9554.c,v 1.1 2005/11/16 04:05:55 deraadt Exp $	*/
+
+/*
+ * Copyright (c) 2005 Theo de Raadt
+ *
+ * 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.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/gpio.h>
+#include <sys/sensors.h>
+
+#include <dev/i2c/i2cvar.h>
+
+#include <dev/gpio/gpiovar.h>
+
+/* Maxim 6690 registers */
+#define PCA9554_IN		0x00
+#define PCA9554_OUT		0x01
+#define PCA9554_POLARITY	0x02
+#define PCA9554_CONFIG		0x03
+
+/* Sensors */
+#define GSCGPIO_NPINS	8
+
+struct pcagpio_softc {
+	struct device	sc_dev;
+	i2c_tag_t	sc_tag;
+	i2c_addr_t	sc_addr;
+	u_int8_t	sc_control;
+	u_int8_t	sc_polarity;
+
+	struct gpio_chipset_tag sc_gpio_gc;
+        gpio_pin_t sc_gpio_pins[GSCGPIO_NPINS];
+
+	struct sensor sc_sensor[GSCGPIO_NPINS];
+};
+
+int	pcagpio_match(struct device *, void *, void *);
+void	pcagpio_attach(struct device *, struct device *, void *);
+int	pcagpio_check(struct i2c_attach_args *, u_int8_t *, u_int8_t *);
+void	pcagpio_refresh(void *);
+
+int     pcagpio_gpio_pin_read(void *, int);
+void    pcagpio_gpio_pin_write(void *, int, int);
+void    pcagpio_gpio_pin_ctl(void *, int, int);
+
+struct cfattach pcagpio_ca = {
+	sizeof(struct pcagpio_softc), pcagpio_match, pcagpio_attach
+};
+
+struct cfdriver pcagpio_cd = {
+	NULL, "pcagpio", DV_DULL
+};
+
+int
+pcagpio_match(struct device *parent, void *match, void *aux)
+{
+	struct i2c_attach_args *ia = aux;
+
+	if (ia->ia_compat) {
+		if (strcmp(ia->ia_compat, "PCA9554") == 0 ||
+		    strcmp(ia->ia_compat, "PCA9554M") == 0)
+			return (1);
+		return (0);
+	}
+	return (1);
+}
+
+void
+pcagpio_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct pcagpio_softc *sc = (struct pcagpio_softc *)self;
+	struct i2c_attach_args *ia = aux;
+	struct gpiobus_attach_args gba;
+	u_int8_t cmd, data;
+	int outputs = 0, i;
+
+	sc->sc_tag = ia->ia_tag;
+	sc->sc_addr = ia->ia_addr;
+
+	cmd = PCA9554_CONFIG;
+	if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
+	    sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
+		printf(": failed to initialize\n");
+		return;
+	}
+	sc->sc_control = data;
+	cmd = PCA9554_POLARITY;
+	if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
+	    sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
+		printf(": failed to initialize\n");
+		return;
+	}
+	sc->sc_polarity = data;
+	cmd = PCA9554_OUT;
+	if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
+	    sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
+		printf(": failed to initialize\n");
+		return;
+	}
+
+	/* Initialize sensor data. */
+	for (i = 0; i < GSCGPIO_NPINS; i++)
+		strlcpy(sc->sc_sensor[i].device, sc->sc_dev.dv_xname,
+		    sizeof(sc->sc_sensor[i].device));
+
+	for (i = 0; i < GSCGPIO_NPINS; i++) {
+		sc->sc_sensor[i].type = SENSOR_INTEGER;
+		if ((sc->sc_control & (1 << i)) == 0) {
+			snprintf(sc->sc_sensor[i].desc,
+			    sizeof(sc->sc_sensor[i].desc), "out%d", i);
+			outputs++;
+		} else
+			snprintf(sc->sc_sensor[i].desc,
+			    sizeof(sc->sc_sensor[i].desc), "in%d", i);
+
+	}
+
+	if (sensor_task_register(sc, pcagpio_refresh, 5)) {
+		printf(", unable to register update task\n");
+		return;
+	}
+
+#if 0
+	for (i = 0; i < GSCGPIO_NPINS; i++)
+		SENSOR_ADD(&sc->sc_sensor[i]);
+#endif
+
+	printf(": %d inputs %d outputs\n", 8 - outputs, outputs);
+
+	for (i = 0; i < GSCGPIO_NPINS; i++) {
+		sc->sc_gpio_pins[i].pin_num = i;
+		sc->sc_gpio_pins[i].pin_caps = GPIO_PIN_INPUT | GPIO_PIN_OUTPUT;
+
+		if ((sc->sc_control & (1 << i)) == 0) {
+			sc->sc_gpio_pins[i].pin_flags = GPIO_PIN_OUTPUT;
+			sc->sc_gpio_pins[i].pin_state =
+			    data & (1 << i) ? GPIO_PIN_HIGH : GPIO_PIN_LOW;
+		}
+	}
+
+	/* Create controller tag */
+	sc->sc_gpio_gc.gp_cookie = sc;
+	sc->sc_gpio_gc.gp_pin_read = pcagpio_gpio_pin_read;
+	sc->sc_gpio_gc.gp_pin_write = pcagpio_gpio_pin_write;
+	sc->sc_gpio_gc.gp_pin_ctl = pcagpio_gpio_pin_ctl;
+
+	gba.gba_name = "gpio";
+	gba.gba_gc = &sc->sc_gpio_gc;
+	gba.gba_pins = sc->sc_gpio_pins;
+	gba.gba_npins = GSCGPIO_NPINS;
+
+	config_found(&sc->sc_dev, &gba, gpiobus_print);
+
+}
+
+void
+pcagpio_refresh(void *arg)
+{
+	struct pcagpio_softc *sc = arg;
+	u_int8_t cmd, in, out, bit;
+	int i;
+
+	iic_acquire_bus(sc->sc_tag, 0);
+
+	cmd = PCA9554_IN;
+	if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
+	    sc->sc_addr, &cmd, sizeof cmd, &in, sizeof in, 0))
+		goto invalid;
+
+	cmd = PCA9554_OUT;
+	if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
+	    sc->sc_addr, &cmd, sizeof cmd, &out, sizeof out, 0))
+		goto invalid;
+
+	for (i = 0; i < GSCGPIO_NPINS; i++) {
+		bit = 1 << i;
+		if ((sc->sc_control & bit))
+			sc->sc_sensor[i].value = (in & bit) ? 1 : 0;
+		else
+			sc->sc_sensor[i].value = (out & bit) ? 1 : 0;
+	}
+
+invalid:
+	iic_release_bus(sc->sc_tag, 0);
+}
+
+
+int
+pcagpio_gpio_pin_read(void *arg, int pin)
+{
+	struct pcagpio_softc *sc = arg;
+	u_int8_t cmd, in;
+
+	cmd = PCA9554_IN;
+	if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
+	    sc->sc_addr, &cmd, sizeof cmd, &in, sizeof in, 0))
+		return 0;
+	return (in & (1 << pin)) ? 1 : 0;
+}
+
+void
+pcagpio_gpio_pin_write(void *arg, int pin, int value)
+{
+	struct pcagpio_softc *sc = arg;
+	u_int8_t cmd, out, mask;
+
+	mask = 0xff ^ (1 << pin);
+	cmd = PCA9554_OUT;
+	if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
+	    sc->sc_addr, &cmd, sizeof cmd, &out, sizeof out, 0))
+		return;
+	out = (out & mask) | (value << pin);
+
+	cmd = PCA9554_OUT;
+	if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
+	    sc->sc_addr, &cmd, sizeof cmd, &out, sizeof out, 0))
+		return;
+}
+
+void
+pcagpio_gpio_pin_ctl(void *arg, int pin, int flags)
+{
+#if 0
+	struct pcagpio_softc *sc = arg;
+	u_int32_t conf;
+
+	pcagpio_gpio_pin_select(sc, pin);
+	conf = bus_space_read_4(sc->sc_gpio_iot, sc->sc_gpio_ioh,
+	    GSCGPIO_CONF);
+
+	conf &= ~(GSCGPIO_CONF_OUTPUTEN | GSCGPIO_CONF_PUSHPULL |
+	    GSCGPIO_CONF_PULLUP);
+	if ((flags & GPIO_PIN_TRISTATE) == 0)
+		conf |= GSCGPIO_CONF_OUTPUTEN;
+	if (flags & GPIO_PIN_PUSHPULL)
+		conf |= GSCGPIO_CONF_PUSHPULL;
+	if (flags & GPIO_PIN_PULLUP)
+		conf |= GSCGPIO_CONF_PULLUP;
+	bus_space_write_4(sc->sc_gpio_iot, sc->sc_gpio_ioh,
+	    GSCGPIO_CONF, conf);
+#endif
+}