--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/symbian-qemu-0.9.1-12/qemu-symbian-svp/hw/i2c.c	Fri Jul 31 15:01:17 2009 +0100
@@ -0,0 +1,153 @@
+/*
+ * QEMU I2C bus interface.
+ *
+ * Copyright (c) 2007 CodeSourcery.
+ * Written by Paul Brook
+ *
+ * This code is licenced under the LGPL.
+ */
+
+#include "hw.h"
+#include "i2c.h"
+
+struct i2c_bus
+{
+    i2c_slave *current_dev;
+    i2c_slave *dev;
+    int saved_address;
+};
+
+static void i2c_bus_save(QEMUFile *f, void *opaque)
+{
+    i2c_bus *bus = (i2c_bus *)opaque;
+
+    qemu_put_byte(f, bus->current_dev ? bus->current_dev->address : -1);
+}
+
+static int i2c_bus_load(QEMUFile *f, void *opaque, int version_id)
+{
+    i2c_bus *bus = (i2c_bus *)opaque;
+
+    if (version_id != 1)
+        return -EINVAL;
+
+    /* The bus is loaded before attached devices, so load and save the
+       current device id.  Devices will check themselves as loaded.  */
+    bus->saved_address = (int8_t) qemu_get_byte(f);
+    bus->current_dev = NULL;
+
+    return 0;
+}
+
+/* Create a new I2C bus.  */
+i2c_bus *i2c_init_bus(void)
+{
+    i2c_bus *bus;
+
+    bus = (i2c_bus *)qemu_mallocz(sizeof(i2c_bus));
+    register_savevm("i2c_bus", -1, 1, i2c_bus_save, i2c_bus_load, bus);
+    return bus;
+}
+
+/* Create a new slave device.  */
+i2c_slave *i2c_slave_init(i2c_bus *bus, int address, int size)
+{
+    i2c_slave *dev;
+
+    if (size < sizeof(i2c_slave))
+        hw_error("I2C struct too small");
+
+    dev = (i2c_slave *)qemu_mallocz(size);
+    dev->address = address;
+    dev->next = bus->dev;
+    bus->dev = dev;
+    dev->bus = bus;
+
+    return dev;
+}
+
+void i2c_set_slave_address(i2c_slave *dev, int address)
+{
+    dev->address = address;
+}
+
+/* Return nonzero if bus is busy.  */
+int i2c_bus_busy(i2c_bus *bus)
+{
+    return bus->current_dev != NULL;
+}
+
+/* Returns non-zero if the address is not valid.  */
+/* TODO: Make this handle multiple masters.  */
+int i2c_start_transfer(i2c_bus *bus, int address, int recv)
+{
+    i2c_slave *dev;
+
+    for (dev = bus->dev; dev; dev = dev->next) {
+        if (dev->address == address)
+            break;
+    }
+
+    if (!dev)
+        return 1;
+
+    /* If the bus is already busy, assume this is a repeated
+       start condition.  */
+    bus->current_dev = dev;
+    dev->event(dev, recv ? I2C_START_RECV : I2C_START_SEND);
+    return 0;
+}
+
+void i2c_end_transfer(i2c_bus *bus)
+{
+    i2c_slave *dev = bus->current_dev;
+
+    if (!dev)
+        return;
+
+    dev->event(dev, I2C_FINISH);
+
+    bus->current_dev = NULL;
+}
+
+int i2c_send(i2c_bus *bus, uint8_t data)
+{
+    i2c_slave *dev = bus->current_dev;
+
+    if (!dev)
+        return -1;
+
+    return dev->send(dev, data);
+}
+
+int i2c_recv(i2c_bus *bus)
+{
+    i2c_slave *dev = bus->current_dev;
+
+    if (!dev)
+        return -1;
+
+    return dev->recv(dev);
+}
+
+void i2c_nack(i2c_bus *bus)
+{
+    i2c_slave *dev = bus->current_dev;
+
+    if (!dev)
+        return;
+
+    dev->event(dev, I2C_NACK);
+}
+
+void i2c_slave_save(QEMUFile *f, i2c_slave *dev)
+{
+    qemu_put_byte(f, dev->address);
+}
+
+void i2c_slave_load(QEMUFile *f, i2c_slave *dev)
+{
+    dev->address = qemu_get_byte(f);
+    if (dev->bus->saved_address == dev->address)
+        dev->bus->current_dev = dev;
+}