implement rudamentary reading from nvram

jsonrtc/conf/jsonrtc.conf

@@ -13,4 +13,5 @@ domain * {
 	static	/time	handle_time
 	static /wkalrm	handle_wkalrm
 	static /device  detect_device
+	static /nvmem	handle_nvmem
 }

jsonrtc/src/jsonrtc.c

@@ -31,6 +31,7 @@ int		page(struct http_request *);
 int handle_time(struct http_request *);
 int handle_wkalrm(struct http_request *);
 int detect_device(struct http_request *);
+int handle_nvmem(struct http_request *);
 
 int
 page(struct http_request *req)
@@ -263,3 +264,38 @@ int detect_device(struct http_request *req) {
                 return (KORE_RESULT_OK);
 	}
 }
+
+int handle_nvmem(struct http_request *req) {
+	int fdesc, bytes_read;
+	unsigned char buf[56];
+	char result_string[113];
+	char buf2[3];
+	char * result_object;
+	cJSON *json_response, *json_string;
+	if(req->method == HTTP_METHOD_GET) {
+		fdesc = open("/sys/bus/nvmem/devices/ds1307_nvram0/nvmem", O_RDONLY);
+		bytes_read = read(fdesc, &buf, 56);
+		if(bytes_read == 56) {
+			result_string[112] = '\0';
+			for(int i=0; i<56; i++) {
+				if (buf[i] <= 15) {
+					sprintf(buf2, "0%x", buf[i]);
+				} else {
+					sprintf(buf2, "%x", buf[i]);
+				}
+				strcpy(result_string + i*2, buf2);
+			}
+			json_response = cJSON_CreateObject();
+			json_string = cJSON_CreateString(result_string);
+			cJSON_AddItemToObject(json_response, "content", json_string);	
+			result_object = cJSON_Print(json_response);
+                        cJSON_Delete(json_response);
+                        http_response_header(req, "Content-Type", "application/json");
+			http_response(req, 200, result_object, strlen(result_object));
+		}	
+		return KORE_RESULT_OK;
+	} else {
+                http_response(req, HTTP_STATUS_METHOD_NOT_ALLOWED, NULL, 0);
+                return (KORE_RESULT_OK);
+        }
+}