1 files changed, 88 insertions, 0 deletions
diff --git a/include/hw/i2c/i2c.h b/include/hw/i2c/i2c.h
new file mode 100644
index 0000000000..461392f374
--- /dev/null
+++ b/include/hw/i2c/i2c.h
@@ -0,0 +1,88 @@
+#ifndef QEMU_I2C_H
+#define QEMU_I2C_H
+
+#include "hw/qdev.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 receive byte.  */
+};
+
+typedef struct I2CSlave I2CSlave;
+
+#define TYPE_I2C_SLAVE "i2c-slave"
+#define I2C_SLAVE(obj) \
+     OBJECT_CHECK(I2CSlave, (obj), TYPE_I2C_SLAVE)
+#define I2C_SLAVE_CLASS(klass) \
+     OBJECT_CLASS_CHECK(I2CSlaveClass, (klass), TYPE_I2C_SLAVE)
+#define I2C_SLAVE_GET_CLASS(obj) \
+     OBJECT_GET_CLASS(I2CSlaveClass, (obj), TYPE_I2C_SLAVE)
+
+typedef struct I2CSlaveClass
+{
+    DeviceClass parent_class;
+
+    /* Callbacks provided by the device.  */
+    int (*init)(I2CSlave *dev);
+
+    /* Master to slave.  */
+    int (*send)(I2CSlave *s, uint8_t data);
+
+    /* Slave to master.  */
+    int (*recv)(I2CSlave *s);
+
+    /* Notify the slave of a bus state change.  */
+    void (*event)(I2CSlave *s, enum i2c_event event);
+} I2CSlaveClass;
+
+struct I2CSlave
+{
+    DeviceState qdev;
+
+    /* Remaining fields for internal use by the I2C code.  */
+    uint8_t address;
+};
+
+i2c_bus *i2c_init_bus(DeviceState *parent, const char *name);
+void i2c_set_slave_address(I2CSlave *dev, uint8_t address);
+int i2c_bus_busy(i2c_bus *bus);
+int i2c_start_transfer(i2c_bus *bus, uint8_t 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);
+
+#define FROM_I2C_SLAVE(type, dev) DO_UPCAST(type, i2c, dev)
+
+DeviceState *i2c_create_slave(i2c_bus *bus, const char *name, uint8_t addr);
+
+/* wm8750.c */
+void wm8750_data_req_set(DeviceState *dev,
+                void (*data_req)(void *, int, int), void *opaque);
+void wm8750_dac_dat(void *opaque, uint32_t sample);
+uint32_t wm8750_adc_dat(void *opaque);
+void *wm8750_dac_buffer(void *opaque, int samples);
+void wm8750_dac_commit(void *opaque);
+void wm8750_set_bclk_in(void *opaque, int new_hz);
+
+/* lm832x.c */
+void lm832x_key_event(DeviceState *dev, int key, int state);
+
+extern const VMStateDescription vmstate_i2c_slave;
+
+#define VMSTATE_I2C_SLAVE(_field, _state) {                          \
+    .name       = (stringify(_field)),                               \
+    .size       = sizeof(I2CSlave),                                  \
+    .vmsd       = &vmstate_i2c_slave,                                \
+    .flags      = VMS_STRUCT,                                        \
+    .offset     = vmstate_offset_value(_state, _field, I2CSlave),    \
+}
+
+#endif