Submitted by: nsouch

Philips I2C bus generic support other new bus architecture.

1 files changed, 215 insertions, 0 deletions

diff --git a/sys/dev/iicbus/iicbus.c b/sys/dev/iicbus/iicbus.c
new file mode 100644
index 0000000..41a0cea
--- /dev/null
+++ b/sys/dev/iicbus/iicbus.c
@@ -0,0 +1,215 @@
+/*-
+ * Copyright (c) 1998 Nicolas Souchu
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	$Id: iicbus.c,v 1.1.2.7 1998/08/29 16:54:16 son Exp $
+ *
+ */
+
+/*
+ * Autoconfiguration and support routines for the Philips serial I2C bus
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/bus.h> 
+
+#include <machine/clock.h>
+
+#include <dev/iicbus/iiconf.h>
+#include <dev/iicbus/iicbus.h>
+
+#include "iicbus_if.h"
+
+#define DEVTOIICBUS(dev) ((struct iicbus_device*)device_get_ivars(dev))
+
+/*
+ * structure used to attach devices to the I2C bus
+ */
+struct iicbus_device {
+	const char *iicd_name;		/* device name */
+	int iicd_class;			/* driver or slave device class */
+	const char *iicd_desc;		/* device descriptor */
+	u_char iicd_addr;		/* address of the device */
+	int iicd_alive;			/* 1 if device found */
+};
+
+/*
+ * Common I2C addresses
+ */
+#define I2C_GENERAL_CALL	0x0
+#define I2C_MASTER_ADDRESS	0xaa
+#define I2C_INET_ADDRESS	0xaa
+
+#define MAXSLAVE 256
+
+#define IICBUS_UNKNOWN_CLASS	0
+#define IICBUS_DEVICE_CLASS	1
+#define IICBUS_DRIVER_CLASS	2
+
+/*
+ * list of known devices
+ */
+struct iicbus_device iicbus_children[] = {
+	{ "iic", IICBUS_DRIVER_CLASS, "General Call", I2C_GENERAL_CALL },
+	{ "iicsmb", IICBUS_DRIVER_CLASS, "I2C to SMB bridge" },
+	{ "iic", IICBUS_DEVICE_CLASS, "PCF8574 I2C to 8 bits parallel i/o", 64},
+	{ "iic", IICBUS_DEVICE_CLASS, "PCF8584 as slave", I2C_MASTER_ADDRESS },
+	{ "ic", IICBUS_DEVICE_CLASS, "network interface", I2C_INET_ADDRESS },
+	{ NULL, 0 }
+};
+
+static devclass_t iicbus_devclass;
+
+/*
+ * Device methods
+ */
+static int iicbus_probe(device_t);
+static int iicbus_attach(device_t);
+static void iicbus_print_child(device_t, device_t);
+static int iicbus_read_ivar(device_t , device_t, int, u_long *);
+
+static device_method_t iicbus_methods[] = {
+        /* device interface */
+        DEVMETHOD(device_probe,         iicbus_probe),
+        DEVMETHOD(device_attach,        iicbus_attach),
+        DEVMETHOD(device_detach,        bus_generic_detach),
+        DEVMETHOD(device_shutdown,      bus_generic_shutdown),
+
+        /* bus interface */
+        DEVMETHOD(bus_print_child,      iicbus_print_child),
+        DEVMETHOD(bus_read_ivar,        iicbus_read_ivar),
+        DEVMETHOD(bus_write_ivar,       bus_generic_write_ivar),
+        DEVMETHOD(bus_create_intr,      bus_generic_create_intr),
+        DEVMETHOD(bus_connect_intr,     bus_generic_connect_intr),
+
+        { 0, 0 }
+};
+
+static driver_t iicbus_driver = {
+        "iicbus",
+        iicbus_methods,
+        DRIVER_TYPE_MISC,
+        sizeof(struct iicbus_softc),
+};
+
+/*
+ * At 'probe' time, we add all the devices which we know about to the
+ * bus.  The generic attach routine will probe and attach them if they
+ * are alive.
+ */
+static int
+iicbus_probe(device_t dev)
+{
+	struct iicbus_softc *sc = device_get_softc(dev);
+	struct iicbus_device *iicdev;
+	device_t child;
+
+	/* XXX should query parent */
+	sc->ownaddr = I2C_MASTER_ADDRESS;
+
+	iicbus_reset(dev, IIC_FASTEST);
+
+	for (iicdev = iicbus_children; iicdev->iicd_name; iicdev++) {
+
+		/* probe devices, not drivers */
+		switch (iicdev->iicd_class) {
+		case IICBUS_DEVICE_CLASS:
+			if (!iicbus_start(dev, iicdev->iicd_addr)) {
+				iicbus_stop(dev);
+				iicdev->iicd_alive = 1;
+			}
+			break;
+		case IICBUS_DRIVER_CLASS:
+			iicdev->iicd_addr = sc->ownaddr;
+			break;
+		default:
+			panic("%s: unknown class!", __FUNCTION__);
+		}
+
+		child = device_add_child(dev, iicdev->iicd_name, -1, iicdev);
+		device_set_desc(child, iicdev->iicd_desc);
+	}
+
+	return (0);
+}
+
+static int
+iicbus_attach(device_t dev)
+{
+	bus_generic_attach(dev);
+         
+        return (0);
+}
+
+int
+iicbus_generic_intr(device_t dev, int event, char *buf)
+{
+	return (0);
+}
+
+static void
+iicbus_print_child(device_t bus, device_t dev)
+{
+	struct iicbus_device* iicdev = DEVTOIICBUS(dev);
+
+	switch (iicdev->iicd_class) {	
+	case IICBUS_DEVICE_CLASS:
+		printf(" on %s%d addr %d %s", device_get_name(bus),
+			device_get_unit(bus), iicdev->iicd_addr,
+			(iicdev->iicd_alive) ? "found" : "not found");
+		break;
+
+	case IICBUS_DRIVER_CLASS:
+		printf(" on %s%d", device_get_name(bus),
+			device_get_unit(bus));
+		break;
+
+	default:
+		panic("%s: unknown class!", __FUNCTION__);
+	}
+
+	return;
+}
+
+static int
+iicbus_read_ivar(device_t bus, device_t dev, int index, u_long* result)
+{
+	struct iicbus_device* iicdev = DEVTOIICBUS(dev);
+
+	switch (index) {
+	case IICBUS_IVAR_ADDR:
+		*result = (u_long)iicdev->iicd_addr;
+		break;
+
+	default:
+		return (ENOENT);
+	}
+
+	return (0);
+}
+
+DRIVER_MODULE(iicbus, pcf, iicbus_driver, iicbus_devclass, 0, 0);