+#define ipmi_version_major(v) ((v)->ipmi_version & 0xf)
+#define ipmi_version_minor(v) ((v)->ipmi_version >> 4)
+
+/* Take a pointer to a raw data buffer and a length and extract device
+ id information from it. The first byte of data must point to the
+ byte from the get device id response after the completion code.
+ The caller is responsible for making sure the length is at least
+ 11 and the command completed without error. */
+static inline void ipmi_demangle_device_id(unsigned char *data,
+ unsigned int data_len,
+ struct ipmi_device_id *id)
+{
+ id->device_id = data[0];
+ id->device_revision = data[1];
+ id->firmware_revision_1 = data[2];
+ id->firmware_revision_2 = data[3];
+ id->ipmi_version = data[4];
+ id->additional_device_support = data[5];
+ id->manufacturer_id = data[6] | (data[7] << 8) | (data[8] << 16);
+ id->product_id = data[9] | (data[10] << 8);
+ if (data_len >= 15) {
+ memcpy(id->aux_firmware_revision, data+11, 4);
+ id->aux_firmware_revision_set = 1;
+ } else
+ id->aux_firmware_revision_set = 0;
+}
+
+/* Add a low-level interface to the IPMI driver. Note that if the
+ interface doesn't know its slave address, it should pass in zero.
+ The low-level interface should not deliver any messages to the
+ upper layer until the start_processing() function in the handlers
+ is called, and the lower layer must get the interface from that
+ call. */