platform/chrome: cros_ec_proto: Use ec_command for check_features

Use the existing cros_ec_command() for cros_ec_check_features(). This
eliminates an unnecessary duplication of the memory allocation/free and
memory copy code.

Signed-off-by: Prashant Malani <pmalani@chromium.org>
Link: https://lore.kernel.org/r/20211004170716.86601-2-pmalani@chromium.org
Signed-off-by: Benson Leung <bleung@chromium.org>

drivers/platform/chrome/cros_ec_proto.c

@@ -813,33 +813,19 @@ EXPORT_SYMBOL(cros_ec_get_host_event);
 bool cros_ec_check_features(struct cros_ec_dev *ec, int feature)
 {
 	struct ec_response_get_features *features = &ec->features;
-	struct cros_ec_command *msg;
 	int ret;
 
 	if (features->flags[0] == -1U && features->flags[1] == -1U) {
 		/* features bitmap not read yet */
-		msg = kzalloc(sizeof(*msg) + sizeof(*features), GFP_KERNEL);
-		if (!msg) {
-			dev_err(ec->dev, "failed to allocate memory to get EC features\n");
-			return false;
-		}
-
-		msg->command = EC_CMD_GET_FEATURES + ec->cmd_offset;
-		msg->insize = sizeof(*features);
-
-		ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
+		ret = cros_ec_command(ec->ec_dev, 0, EC_CMD_GET_FEATURES + ec->cmd_offset,
+				      NULL, 0, features, sizeof(*features));
 		if (ret < 0) {
-			dev_warn(ec->dev, "cannot get EC features: %d/%d\n",
-				 ret, msg->result);
+			dev_warn(ec->dev, "cannot get EC features: %d\n", ret);
 			memset(features, 0, sizeof(*features));
-		} else {
-			memcpy(features, msg->data, sizeof(*features));
 		}
 
 		dev_dbg(ec->dev, "EC features %08x %08x\n",
 			features->flags[0], features->flags[1]);
-
-		kfree(msg);
 	}
 
 	return !!(features->flags[feature / 32] & EC_FEATURE_MASK_0(feature));