Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 50 insertions, 0 deletions

diff --git a/include/hw/i2c/bitbang_i2c.h b/include/hw/i2c/bitbang_i2c.h
new file mode 100644
index 000000000..92334e901
--- /dev/null
+++ b/include/hw/i2c/bitbang_i2c.h
@@ -0,0 +1,50 @@
+#ifndef BITBANG_I2C_H
+#define BITBANG_I2C_H
+
+#include "hw/i2c/i2c.h"
+
+typedef struct bitbang_i2c_interface bitbang_i2c_interface;
+
+#define BITBANG_I2C_SDA 0
+#define BITBANG_I2C_SCL 1
+
+typedef enum bitbang_i2c_state {
+    STOPPED = 0,
+    SENDING_BIT7,
+    SENDING_BIT6,
+    SENDING_BIT5,
+    SENDING_BIT4,
+    SENDING_BIT3,
+    SENDING_BIT2,
+    SENDING_BIT1,
+    SENDING_BIT0,
+    WAITING_FOR_ACK,
+    RECEIVING_BIT7,
+    RECEIVING_BIT6,
+    RECEIVING_BIT5,
+    RECEIVING_BIT4,
+    RECEIVING_BIT3,
+    RECEIVING_BIT2,
+    RECEIVING_BIT1,
+    RECEIVING_BIT0,
+    SENDING_ACK,
+    SENT_NACK
+} bitbang_i2c_state;
+
+struct bitbang_i2c_interface {
+    I2CBus *bus;
+    bitbang_i2c_state state;
+    int last_data;
+    int last_clock;
+    int device_out;
+    uint8_t buffer;
+    int current_addr;
+};
+
+/**
+ * bitbang_i2c_init: in-place initialize the bitbang_i2c_interface struct
+ */
+void bitbang_i2c_init(bitbang_i2c_interface *s, I2CBus *bus);
+int bitbang_i2c_set(bitbang_i2c_interface *i2c, int line, int level);
+
+#endif