Fix mbtk gnss.

Change-Id: I08476f2f51cd7b0f7898b109201302409d76a6d2
diff --git a/mbtk/include/mbtk/mbtk_gnss.h b/mbtk/include/mbtk/mbtk_gnss.h
index b585f7d..3ecf53c 100755
--- a/mbtk/include/mbtk/mbtk_gnss.h
+++ b/mbtk/include/mbtk/mbtk_gnss.h
@@ -12,8 +12,15 @@
 
 #include "mbtk_type.h"
 
-#define MBTK_GNSS_IND_LOCATION (1)
-#define MBTK_GNSS_IND_NMEA (1 << 1)
+// Refor to : mbtk_gnss_ind_set() gnss_ind
+#define MBTK_GNSS_IND_LOCATION (1)      // 1
+#define MBTK_GNSS_IND_NMEA (1 << 1)     // 2
+
+// Refor to : mbtk_gnss_open() type
+#define GNSS_PRINT_PORT_UART1       1           // 1
+#define GNSS_PRINT_PORT_USB_NMEA    (1<<1)      // 2
+#define GNSS_PRINT_PORT_USB_AT      (1<<2)      // 4
+#define GNSS_PRINT_PORT_TTY_AT      (1<<3)      // 8
 
 #define MBTK_IND_START_FLAG     0xFF
 #define MBTK_IND_END_FLAG       0xEE
diff --git a/mbtk/libmbtk_gnss/mbtk_gnss.c b/mbtk/libmbtk_gnss/mbtk_gnss.c
index 515feae..11bbfd3 100755
--- a/mbtk/libmbtk_gnss/mbtk_gnss.c
+++ b/mbtk/libmbtk_gnss/mbtk_gnss.c
@@ -353,6 +353,24 @@
     return GNSS_ERR_OK;
 }
 
+/*===========================================================================
+FUNCTION mbtk_gnss_open
+
+DESCRIPTION:
+  Open/Close GNSS.
+
+PARAMETERS:
+  type [IN]: How to turn on or off GNSS,The available values are as follows:
+           0 : Close GNSS;
+           1-15 : Open GNSS with NMEA print;
+              (GNSS_PRINT_PORT_UART1 / GNSS_PRINT_PORT_USB_NMEA / GNSS_PRINT_PORT_USB_AT / GNSS_PRINT_PORT_TTY_AT)
+           Other : Open GNSS without print NMEA
+  timeout [IN]: Timeout with second.
+
+RETURN VALUE:
+  gnss_err_enum
+
+===========================================================================*/
 gnss_err_enum mbtk_gnss_open(int type, int timeout)
 {
     if(gnss_cli_fd < 0) {
@@ -481,7 +499,13 @@
     }
 }
 
-
+/**
+* Set GNSS data callback.
+*
+* gnss_ind : MBTK_GNSS_IND_LOCATION / MBTK_GNSS_IND_NMEA
+* timeout : Timeout with second.
+*
+*/
 gnss_err_enum mbtk_gnss_ind_set(uint32 gnss_ind, int timeout)
 {
     if(gnss_cli_fd < 0) {
diff --git a/mbtk/mbtk_gnssd/gnss_info.h b/mbtk/mbtk_gnssd/gnss_info.h
index 34aa6b1..2b91523 100755
--- a/mbtk/mbtk_gnssd/gnss_info.h
+++ b/mbtk/mbtk_gnssd/gnss_info.h
@@ -16,11 +16,6 @@
 #define GNSS_ID_8122 "8122"
 #define GNSS_ID_N50DB "N50DB"
 
-#define GNSS_PRINT_PORT_UART1       1           // 1
-#define GNSS_PRINT_PORT_USB_NMEA    (1<<1)      // 2
-#define GNSS_PRINT_PORT_USB_AT      (1<<2)      // 4
-#define GNSS_PRINT_PORT_TTY_AT      (1<<3)      // 8
-
 #define GNSS_SET_SYSCFG_GPS (1)
 #define GNSS_SET_SYSCFG_BDS (1<<1)
 #define GNSS_SET_SYSCFG_GLO (1<<2)
diff --git a/mbtk/mbtk_gnssd/gnss_ipc.c b/mbtk/mbtk_gnssd/gnss_ipc.c
index 54ba823..cd16385 100755
--- a/mbtk/mbtk_gnssd/gnss_ipc.c
+++ b/mbtk/mbtk_gnssd/gnss_ipc.c
@@ -59,11 +59,11 @@
         if(init_mode == 0) { // Close gnss.
             ret = gnss_deinit();
         } else {
-            if(((GNSS_PRINT_PORT_UART1 | GNSS_PRINT_PORT_USB_NMEA | GNSS_PRINT_PORT_USB_AT | GNSS_PRINT_PORT_TTY_AT) & init_mode) == init_mode) {
-                ret = gnss_init(init_mode);
-            } else { // ARG error, no print nmea.
-                ret = GNSS_ERR_ARG;
+            // ARG error, no print nmea.
+            if(((GNSS_PRINT_PORT_UART1 | GNSS_PRINT_PORT_USB_NMEA | GNSS_PRINT_PORT_USB_AT | GNSS_PRINT_PORT_TTY_AT) & init_mode) != init_mode) {
+                init_mode = 0;
             }
+            ret = gnss_init(init_mode);
         }
 
         char rsp[100] = {0};