Driver for the Philips PCA9532 LCD dimmer controller, found on thecus.

1 files changed, 180 insertions, 0 deletions

diff --git a/sys/dev/i2c/pca9532.c b/sys/dev/i2c/pca9532.c
new file mode 100644
index 00000000000..406a80d2745
--- /dev/null
+++ b/sys/dev/i2c/pca9532.c
@@ -0,0 +1,180 @@
+/*	$OpenBSD: pca9532.c,v 1.1 2006/06/17 04:43:01 drahn Exp $ */
+/*
+ * Copyright (c) 2006 Dale Rahn <drahn@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.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/kernel.h>
+#include <sys/fcntl.h>
+#include <sys/uio.h>
+#include <sys/conf.h>
+#include <sys/gpio.h>
+
+
+#include <dev/i2c/i2cvar.h>
+#include <dev/gpio/gpiovar.h>
+
+#include "gpio.h"
+
+/* driver for PCA 9532 */
+
+#define PCALED_ADDR 0x60
+
+#define PCALED_GPIO_NPINS 16
+
+struct pcaled_softc {
+	struct device sc_dev;
+	i2c_tag_t sc_tag;
+	int sc_addr;
+	struct gpio_chipset_tag sc_gpio_gc;
+	struct gpio_pin sc_gpio_pin[PCALED_GPIO_NPINS];
+
+};
+
+int pcaled_match(struct device *, void *, void *);
+void pcaled_attach(struct device *, struct device *, void *);
+int pcaled_gpio_pin_read(void *arg, int pin);
+void pcaled_gpio_pin_write (void *arg, int pin, int value);
+void pcaled_gpio_pin_ctl (void *arg, int pin, int flags);
+
+struct cfattach pcaled_ca = {
+	sizeof(struct pcaled_softc), pcaled_match, pcaled_attach
+};
+
+struct cfdriver pcaled_cd = {
+	NULL, "pcaled", DV_DULL
+};
+
+int
+pcaled_match(struct device *parent, void *v, void *arg)
+{
+	struct i2c_attach_args *ia = arg;
+	int ok = 0;
+	uint8_t cmd, data;
+
+	if (ia->ia_addr != PCALED_ADDR)
+		return (0);
+	/* attempt to read input register 0 */
+	iic_acquire_bus(ia->ia_tag, I2C_F_POLL);
+	cmd = 0;
+	if (iic_exec(ia->ia_tag, I2C_OP_READ_WITH_STOP, ia->ia_addr,
+	    &cmd, 1, &data, 1, I2C_F_POLL))
+		goto fail;
+	ok = 1;
+fail:
+	iic_release_bus(ia->ia_tag, I2C_F_POLL);
+	return (1);
+}
+
+void
+pcaled_attach(struct device *parent, struct device *self, void *arg)
+{
+	struct pcaled_softc *sc = (void *)self;
+	struct i2c_attach_args *ia = arg;
+	struct gpiobus_attach_args gba;
+	int i;
+	uint8_t cmd, data;
+
+	sc->sc_tag = ia->ia_tag;
+	sc->sc_addr = ia->ia_addr;
+
+	iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
+
+	for (i = 0; i < PCALED_GPIO_NPINS; i++) {
+		sc->sc_gpio_pin[i].pin_num = i;
+		sc->sc_gpio_pin[i].pin_caps = GPIO_PIN_INOUT;
+		if (i < 8)
+			cmd = 0;
+		else
+			cmd = 1;
+		if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
+		    &cmd, 1, &data, 1, I2C_F_POLL))
+			goto fail; /* XXX */
+		sc->sc_gpio_pin[i].pin_state = (data >> (i & 3)) & 1;
+	}
+	sc->sc_gpio_gc.gp_cookie = sc;
+	sc->sc_gpio_gc.gp_pin_read = pcaled_gpio_pin_read;
+	sc->sc_gpio_gc.gp_pin_write = pcaled_gpio_pin_write;
+	sc->sc_gpio_gc.gp_pin_ctl = pcaled_gpio_pin_ctl;
+
+	printf(": PCA9532 LED controller\n");
+
+	gba.gba_name = "gpio";
+	gba.gba_gc = &sc->sc_gpio_gc;
+	gba.gba_pins = sc->sc_gpio_pin;
+	gba.gba_npins = PCALED_GPIO_NPINS;
+#if NGPIO > 0
+	config_found(&sc->sc_dev, &gba, gpiobus_print);
+#endif
+
+fail:
+	iic_release_bus(sc->sc_tag, I2C_F_POLL);
+}
+
+int
+pcaled_gpio_pin_read(void *arg, int pin)
+{
+	struct pcaled_softc *sc = arg;
+	iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
+	uint8_t cmd, data;
+
+	if (pin < 8)
+		cmd = 0;
+	else
+		cmd = 1;
+	if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
+	    &cmd, 1, &data, 1, I2C_F_POLL))
+		goto fail; /* XXX */
+
+fail:
+	iic_release_bus(sc->sc_tag, I2C_F_POLL);
+	return (data >> (pin & 3)) & 1;
+}
+
+void
+pcaled_gpio_pin_write (void *arg, int pin, int value)
+{
+	struct pcaled_softc *sc = arg;
+	uint8_t cmd, data;
+	if (pin < 4)
+		cmd = 6;
+	else if (pin < 8)
+		cmd = 7;
+	else if (pin < 12)
+		cmd = 8;
+	else
+		cmd = 9;
+	if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
+	    &cmd, 1, &data, 1, I2C_F_POLL))
+		goto fail; /* XXX */
+	data &= ~(0x3 << (2*(pin & 3)));
+	data |= (value << (2*(pin & 3)));
+
+	if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
+	    &cmd, 1, &data, 1, I2C_F_POLL))
+		goto fail; /* XXX */
+
+fail:
+	iic_release_bus(sc->sc_tag, I2C_F_POLL);
+}
+
+void
+pcaled_gpio_pin_ctl (void *arg, int pin, int flags)
+{
+	/* XXX all pins are inout */ 
+}
+