1 files changed, 69 insertions, 0 deletions
diff --git a/include/hw/i2c/smbus_slave.h b/include/hw/i2c/smbus_slave.h
new file mode 100644
index 0000000000..46b8948f0f
--- /dev/null
+++ b/include/hw/i2c/smbus_slave.h
@@ -0,0 +1,69 @@
+/*
+ * QEMU SMBus device (slave) API
+ *
+ * Copyright (c) 2007 Arastra, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef HW_SMBUS_SLAVE_H
+#define HW_SMBUS_SLAVE_H
+
+#include "hw/i2c/i2c.h"
+
+#define TYPE_SMBUS_DEVICE "smbus-device"
+#define SMBUS_DEVICE(obj) \
+     OBJECT_CHECK(SMBusDevice, (obj), TYPE_SMBUS_DEVICE)
+#define SMBUS_DEVICE_CLASS(klass) \
+     OBJECT_CLASS_CHECK(SMBusDeviceClass, (klass), TYPE_SMBUS_DEVICE)
+#define SMBUS_DEVICE_GET_CLASS(obj) \
+     OBJECT_GET_CLASS(SMBusDeviceClass, (obj), TYPE_SMBUS_DEVICE)
+
+typedef struct SMBusDevice SMBusDevice;
+
+typedef struct SMBusDeviceClass
+{
+    I2CSlaveClass parent_class;
+    void (*quick_cmd)(SMBusDevice *dev, uint8_t read);
+    void (*send_byte)(SMBusDevice *dev, uint8_t val);
+    uint8_t (*receive_byte)(SMBusDevice *dev);
+    /* We can't distinguish between a word write and a block write with
+       length 1, so pass the whole data block including the length byte
+       (if present).  The device is responsible figuring out what type of
+       command  this is.  */
+    void (*write_data)(SMBusDevice *dev, uint8_t cmd, uint8_t *buf, int len);
+    /* Likewise we can't distinguish between different reads, or even know
+       the length of the read until the read is complete, so read data a
+       byte at a time.  The device is responsible for adding the length
+       byte on block reads.  */
+    uint8_t (*read_data)(SMBusDevice *dev, uint8_t cmd, int n);
+} SMBusDeviceClass;
+
+struct SMBusDevice {
+    /* The SMBus protocol is implemented on top of I2C.  */
+    I2CSlave i2c;
+
+    /* Remaining fields for internal use only.  */
+    int mode;
+    int data_len;
+    uint8_t data_buf[34]; /* command + len + 32 bytes of data.  */
+    uint8_t command;
+};
+
+#endif