greybus: Revert "interface: Fetch and expose version of interface's firmware"

This reverts commit b957ade7b3e4ab8c149c53346dbf02e977b7f3a7.

The interface version is now managed as part of the firmware-management
protocol. This operation is already removed from the greybus
specifications.

Drop interface version support from greybus.

Tested with gbsim (sysfs file not available after this patch).
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Acked-by: Sandeep Patil <sspatil@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/Documentation/sysfs-bus-greybus

@@ -111,14 +111,6 @@ Contact:	Greg Kroah-Hartman <greg@kroah.com>
 Description:
 		Vendor ID of a Greybus interface.
 
-What:		/sys/bus/greybus/devices/N-M.I/version
-Date:		October 2015
-KernelVersion:	4.XX
-Contact:	Greg Kroah-Hartman <greg@kroah.com>
-Description:
-		Interface version represented as <16 bit major number>.<16 bit
-		minor number>.
-
 What:		/sys/bus/greybus/devices/N-M.I/voltage_now
 Date:		March 2016
 KernelVersion:	4.XX

drivers/staging/greybus/control.c

@@ -156,34 +156,6 @@ int gb_control_mode_switch_operation(struct gb_control *control)
 						NULL, 0);
 }
 
-int gb_control_get_interface_version_operation(struct gb_interface *intf)
-{
-	struct gb_control_interface_version_response response;
-	struct gb_connection *connection = intf->control->connection;
-	int ret;
-
-	if (intf->quirks & GB_INTERFACE_QUIRK_NO_INTERFACE_VERSION)
-		return 0;
-
-	ret = gb_operation_sync(connection, GB_CONTROL_TYPE_INTERFACE_VERSION,
-				NULL, 0, &response, sizeof(response));
-	if (ret) {
-		dev_err(&connection->intf->dev,
-			"failed to get interface version: %d\n", ret);
-		/*
-		 * FIXME: Return success until the time we bump version of
-		 * control protocol. The interface-version is already set to
-		 * 0.0, so no need to update that.
-		 */
-		return 0;
-	}
-
-	intf->version_major = le16_to_cpu(response.major);
-	intf->version_minor = le16_to_cpu(response.minor);
-
-	return 0;
-}
-
 int gb_control_timesync_enable(struct gb_control *control, u8 count,
 			       u64 frame_time, u32 strobe_delay, u32 refclk)
 {

drivers/staging/greybus/control.h

@@ -40,7 +40,6 @@ int gb_control_mode_switch_operation(struct gb_control *control);
 int gb_control_get_manifest_size_operation(struct gb_interface *intf);
 int gb_control_get_manifest_operation(struct gb_interface *intf, void *manifest,
 				      size_t size);
-int gb_control_get_interface_version_operation(struct gb_interface *intf);
 int gb_control_timesync_enable(struct gb_control *control, u8 count,
 			       u64 frame_time, u32 strobe_delay, u32 refclk);
 int gb_control_timesync_disable(struct gb_control *control);

drivers/staging/greybus/greybus_protocols.h

@@ -121,7 +121,7 @@ struct gb_protocol_version_response {
 #define GB_CONTROL_TYPE_TIMESYNC_ENABLE		0x07
 #define GB_CONTROL_TYPE_TIMESYNC_DISABLE	0x08
 #define GB_CONTROL_TYPE_TIMESYNC_AUTHORITATIVE	0x09
-#define GB_CONTROL_TYPE_INTERFACE_VERSION	0x0a
+/*	Unused					0x0a */
 #define GB_CONTROL_TYPE_BUNDLE_VERSION		0x0b
 #define GB_CONTROL_TYPE_MODE_SWITCH		0x0e
 
@@ -164,12 +164,6 @@ struct gb_control_disconnected_request {
 } __packed;
 /* Control protocol [dis]connected response has no payload */
 
-/* Control protocol interface version request has no payload */
-struct gb_control_interface_version_response {
-	__le16			major;
-	__le16			minor;
-} __packed;
-
 #define GB_TIMESYNC_MAX_STROBES			0x04
 
 struct gb_control_timesync_enable_request {

drivers/staging/greybus/interface.c

@@ -254,16 +254,6 @@ gb_interface_attr(vendor_id, "0x%08x");
 gb_interface_attr(product_id, "0x%08x");
 gb_interface_attr(serial_number, "0x%016llx");
 
-static ssize_t version_show(struct device *dev, struct device_attribute *attr,
-			    char *buf)
-{
-	struct gb_interface *intf = to_gb_interface(dev);
-
-	return scnprintf(buf, PAGE_SIZE, "%u.%u\n", intf->version_major,
-			 intf->version_minor);
-}
-static DEVICE_ATTR_RO(version);
-
 static ssize_t voltage_now_show(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
@@ -328,7 +318,6 @@ static struct attribute *interface_attrs[] = {
 	&dev_attr_vendor_id.attr,
 	&dev_attr_product_id.attr,
 	&dev_attr_serial_number.attr,
-	&dev_attr_version.attr,
 	&dev_attr_voltage_now.attr,
 	&dev_attr_current_now.attr,
 	&dev_attr_power_now.attr,
@@ -621,10 +610,6 @@ int gb_interface_enable(struct gb_interface *intf)
 		goto err_destroy_bundles;
 	}
 
-	ret = gb_control_get_interface_version_operation(intf);
-	if (ret)
-		goto err_destroy_bundles;
-
 	ret = gb_control_get_bundle_versions(intf->control);
 	if (ret)
 		goto err_destroy_bundles;

drivers/staging/greybus/interface.h

@@ -31,9 +31,6 @@ struct gb_interface {
 	u32 product_id;
 	u64 serial_number;
 
-	u16 version_major;
-	u16 version_minor;
-
 	struct gb_host_device *hd;
 	struct gb_module *module;