greybus: svc: add stub interface-activate function

Add message structures (based on the current spec) for the SVC Interface
Activate operation, and a stub function that always return the Greybus
interface type.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/greybus_protocols.h

@@ -802,6 +802,7 @@ struct gb_spi_transfer_response {
 #define GB_SVC_TYPE_PWRMON_RAIL_NAMES_GET	0x15
 #define GB_SVC_TYPE_PWRMON_SAMPLE_GET		0x16
 #define GB_SVC_TYPE_PWRMON_INTF_SAMPLE_GET	0x17
+#define GB_SVC_TYPE_INTF_ACTIVATE		0x27
 
 /*
  * SVC version request/response has the same payload as
@@ -1008,6 +1009,19 @@ struct gb_svc_pwrmon_intf_sample_get_response {
 	__le32	measurement;
 } __packed;
 
+struct gb_svc_intf_activate_request {
+	__u8	intf_id;
+} __packed;
+
+#define GB_SVC_INTF_TYPE_UNKNOWN		0x00
+#define GB_SVC_INTF_TYPE_DUMMY			0x01
+#define GB_SVC_INTF_TYPE_UNIPRO			0x02
+#define GB_SVC_INTF_TYPE_GREYBUS		0x03
+
+struct gb_svc_intf_activate_response {
+	__u8	intf_type;
+} __packed;
+
 /* RAW */
 
 /* Version of the Greybus raw protocol we support */

drivers/staging/greybus/svc.c

@@ -274,6 +274,15 @@ int gb_svc_intf_unipro_set(struct gb_svc *svc, u8 intf_id, bool enable)
 	return 0;
 }
 
+int gb_svc_intf_activate(struct gb_svc *svc, u8 intf_id, u8 *intf_type)
+{
+	/* FIXME: implement */
+
+	*intf_type = GB_SVC_INTF_TYPE_GREYBUS;
+
+	return 0;
+}
+
 int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
 			u32 *value)
 {

drivers/staging/greybus/svc.h

@@ -72,6 +72,7 @@ int gb_svc_intf_eject(struct gb_svc *svc, u8 intf_id);
 int gb_svc_intf_vsys_set(struct gb_svc *svc, u8 intf_id, bool enable);
 int gb_svc_intf_refclk_set(struct gb_svc *svc, u8 intf_id, bool enable);
 int gb_svc_intf_unipro_set(struct gb_svc *svc, u8 intf_id, bool enable);
+int gb_svc_intf_activate(struct gb_svc *svc, u8 intf_id, u8 *intf_type);
 int gb_svc_dme_peer_get(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,
 			u32 *value);
 int gb_svc_dme_peer_set(struct gb_svc *svc, u8 intf_id, u16 attr, u16 selector,