1 files changed, 49 insertions, 0 deletions
diff --git a/hw/i2c.h b/hw/i2c.h
new file mode 100644
index 0000000000..a3c4de3cac
--- /dev/null
+++ b/hw/i2c.h
@@ -0,0 +1,49 @@
+#ifndef QEMU_I2C_H
+#define QEMU_I2C_H
+
+/* The QEMU I2C implementation only supports simple transfers that complete
+   immediately.  It does not support slave devices that need to be able to
+   defer their response (eg. CPU slave interfaces where the data is supplied
+   by the device driver in response to an interrupt).  */
+
+enum i2c_event {
+    I2C_START_RECV,
+    I2C_START_SEND,
+    I2C_FINISH,
+    I2C_NACK /* Masker NACKed a recieve byte.  */
+};
+
+typedef struct i2c_slave i2c_slave;
+
+/* Master to slave.  */
+typedef int (*i2c_send_cb)(i2c_slave *s, uint8_t data);
+/* Slave to master.  */
+typedef int (*i2c_recv_cb)(i2c_slave *s);
+/* Notify the slave of a bus state change.  */
+typedef void (*i2c_event_cb)(i2c_slave *s, enum i2c_event event);
+
+struct i2c_slave
+{
+    /* Callbacks to be set by the device.  */
+    i2c_event_cb event;
+    i2c_recv_cb recv;
+    i2c_send_cb send;
+
+    /* Remaining fields for internal use by the I2C code.  */
+    int address;
+    void *next;
+};
+
+typedef struct i2c_bus i2c_bus;
+
+i2c_bus *i2c_init_bus(void);
+i2c_slave *i2c_slave_init(i2c_bus *bus, int address, int size);
+void i2c_set_slave_address(i2c_slave *dev, int address);
+int i2c_bus_busy(i2c_bus *bus);
+int i2c_start_transfer(i2c_bus *bus, int address, int recv);
+void i2c_end_transfer(i2c_bus *bus);
+void i2c_nack(i2c_bus *bus);
+int i2c_send(i2c_bus *bus, uint8_t data);
+int i2c_recv(i2c_bus *bus);
+
+#endif