+void i2c_bus_save(QEMUFile *f, i2c_bus *bus);
+void i2c_bus_load(QEMUFile *f, i2c_bus *bus);
+void i2c_slave_save(QEMUFile *f, i2c_slave *dev);
+void i2c_slave_load(QEMUFile *f, i2c_slave *dev);
+
+/* max7310.c */
+i2c_slave *max7310_init(i2c_bus *bus);
+void max7310_reset(i2c_slave *i2c);
+qemu_irq *max7310_gpio_in_get(i2c_slave *i2c);
+void max7310_gpio_out_set(i2c_slave *i2c, int line, qemu_irq handler);
+
+/* wm8750.c */
+i2c_slave *wm8750_init(i2c_bus *bus, AudioState *audio);
+void wm8750_reset(i2c_slave *i2c);
+void wm8750_data_req_set(i2c_slave *i2c,
+ void (*data_req)(void *, int, int), void *opaque);
+void wm8750_dac_dat(void *opaque, uint32_t sample);
+uint32_t wm8750_adc_dat(void *opaque);