2 files changed, 35 insertions, 1 deletions
diff --git a/include/hw/i2c/i2c.h b/include/hw/i2c/i2c.h
index 277dd9f..ff4129e 100644
--- a/include/hw/i2c/i2c.h
+++ b/include/hw/i2c/i2c.h
@@ -16,6 +16,7 @@ enum i2c_event {
     I2C_NACK /* Masker NACKed a receive byte.  */
 };
 
+typedef struct I2CNodeList I2CNodeList;
 
 #define TYPE_I2C_SLAVE "i2c-slave"
 OBJECT_DECLARE_TYPE(I2CSlave, I2CSlaveClass,
@@ -39,6 +40,16 @@ struct I2CSlaveClass {
      * return code is not used and should be zero.
      */
     int (*event)(I2CSlave *s, enum i2c_event event);
+
+    /*
+     * Check if this device matches the address provided.  Returns bool of
+     * true if it matches (or broadcast), and updates the device list, false
+     * otherwise.
+     *
+     * If broadcast is true, match should add the device and return true.
+     */
+    bool (*match_and_add)(I2CSlave *candidate, uint8_t address, bool broadcast,
+                          I2CNodeList *current_devs);
 };
 
 struct I2CSlave {
@@ -58,9 +69,11 @@ struct I2CNode {
     QLIST_ENTRY(I2CNode) next;
 };
 
+typedef QLIST_HEAD(I2CNodeList, I2CNode) I2CNodeList;
+
 struct I2CBus {
     BusState qbus;
-    QLIST_HEAD(, I2CNode) current_devs;
+    I2CNodeList current_devs;
     uint8_t saved_address;
     bool broadcast;
 };
@@ -74,6 +87,8 @@ void i2c_nack(I2CBus *bus);
 int i2c_send_recv(I2CBus *bus, uint8_t *data, bool send);
 int i2c_send(I2CBus *bus, uint8_t data);
 uint8_t i2c_recv(I2CBus *bus);
+bool i2c_scan_bus(I2CBus *bus, uint8_t address, bool broadcast,
+                  I2CNodeList *current_devs);
 
 /**
  * Create an I2C slave device on the heap.
diff --git a/include/hw/i2c/i2c_mux_pca954x.h b/include/hw/i2c/i2c_mux_pca954x.h
new file mode 100644
index 0000000..8aaf9bb
--- /dev/null
+++ b/include/hw/i2c/i2c_mux_pca954x.h
@@ -0,0 +1,19 @@
+#ifndef QEMU_I2C_MUX_PCA954X
+#define QEMU_I2C_MUX_PCA954X
+
+#include "hw/i2c/i2c.h"
+
+#define TYPE_PCA9546 "pca9546"
+#define TYPE_PCA9548 "pca9548"
+
+/**
+ * Retrieves the i2c bus associated with the specified channel on this i2c
+ * mux.
+ * @mux: an i2c mux device.
+ * @channel: the i2c channel requested
+ *
+ * Returns: a pointer to the associated i2c bus.
+ */
+I2CBus *pca954x_i2c_get_bus(I2CSlave *mux, uint8_t channel);
+
+#endif