greybus: Revert "Added a sysfs entry to power down the SVC"

This reverts commit a1d8f2c3856804ed26157104bb203edf4c882a6c.

drivers/staging/greybus/greybus_protocols.h

@@ -798,7 +798,6 @@ struct gb_spi_transfer_response {
 #define GB_SVC_TYPE_INTF_EJECT			0x11
 #define GB_SVC_TYPE_KEY_EVENT			0x12
 #define GB_SVC_TYPE_PING			0x13
-#define GB_SVC_TYPE_PWR_DOWN			0x1d
 
 /*
  * SVC version request/response has the same payload as

drivers/staging/greybus/svc.c

@@ -99,31 +99,11 @@ static ssize_t watchdog_store(struct device *dev,
 }
 static DEVICE_ATTR_RW(watchdog);
 
-static ssize_t pwr_off_store(struct device *dev,
-			     struct device_attribute *attr, const char *buf,
-			     size_t len)
-{
-	struct gb_svc *svc = to_gb_svc(dev);
-	int retval;
-	bool user_request;
-
-	retval = strtobool(buf, &user_request);
-	if (retval) {
-		return retval;
-	}
-	if (user_request) {
-		retval = gb_svc_pwr_off(svc);
-	}
-	return len;
-}
-static DEVICE_ATTR_WO(pwr_off);
-
 static struct attribute *svc_attrs[] = {
 	&dev_attr_endo_id.attr,
 	&dev_attr_ap_intf_id.attr,
 	&dev_attr_intf_eject.attr,
 	&dev_attr_watchdog.attr,
-	&dev_attr_pwr_off.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(svc);
@@ -340,14 +320,6 @@ int gb_svc_ping(struct gb_svc *svc)
 }
 EXPORT_SYMBOL_GPL(gb_svc_ping);
 
-int gb_svc_pwr_off(struct gb_svc *svc)
-{
-	return gb_operation_sync_timeout(svc->connection, GB_SVC_TYPE_PWR_DOWN,
-					 NULL, 0, NULL, 0,
-					 GB_OPERATION_TIMEOUT_DEFAULT * 2);
-}
-EXPORT_SYMBOL_GPL(gb_svc_pwr_off);
-
 static int gb_svc_version_request(struct gb_operation *op)
 {
 	struct gb_connection *connection = op->connection;

drivers/staging/greybus/svc.h

@@ -71,7 +71,6 @@ void gb_svc_watchdog_destroy(struct gb_svc *svc);
 bool gb_svc_watchdog_enabled(struct gb_svc *svc);
 int gb_svc_watchdog_enable(struct gb_svc *svc);
 int gb_svc_watchdog_disable(struct gb_svc *svc);
-int gb_svc_pwr_off(struct gb_svc *svc);
 
 int gb_svc_protocol_init(void);
 void gb_svc_protocol_exit(void);