ltq-vdsl-vr9: fix missing-prototypes warnings

* Mark some functions as static.
* Include function prototypes header file.

Signed-off-by: Shiji Yang <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/18744
Signed-off-by: Robert Marko <[email protected]>
(cherry picked from commit 262917ef347fed2c7622fd813c32368bced41133)
Signed-off-by: Nora Matthias Schiffer <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/20440
Signed-off-by: Hauke Mehrtens <[email protected]>

package/kernel/lantiq/ltq-vdsl-vr9/patches/303-fix-missing-prototypes-warning.patch

@@ -0,0 +1,100 @@
+From: Shiji Yang <[email protected]>
+Date: Fri, 9 May 2025 02:48:52 +0800
+Subject: [PATCH] fix missing-prototypes warning
+
+This patch fixes various missing-prototypes build warnings on
+6.12 kernel.
+
+Signed-off-by: Shiji Yang <[email protected]>
+---
+ src/common/drv_dsl_cpe_api.c        | 12 ++++++------
+ src/common/drv_dsl_cpe_os_linux.c   |  4 ++--
+ src/g997/drv_dsl_cpe_api_g997_vrx.c |  1 +
+ 3 files changed, 9 insertions(+), 8 deletions(-)
+
+--- a/src/common/drv_dsl_cpe_api.c
++++ b/src/common/drv_dsl_cpe_api.c
+@@ -2871,7 +2871,7 @@ DSL_Error_t DSL_DRV_LoopLengthStatusGet(
+    return nErrCode;
+ }
+ 
+-DSL_Error_t DSL_DRV_RetxStatisticsGet(
++static DSL_Error_t DSL_DRV_RetxStatisticsGet(
+    DSL_IN DSL_Context_t *pContext,
+    DSL_IN_OUT DSL_ReTxStatistics_t *pData)
+ {
+@@ -3044,7 +3044,7 @@ DSL_Error_t DSL_DRV_SystemInterfaceConfi
+    \ref DSL_FIO_SYSTEM_INTERFACE_STATUS_GET
+ */
+ #ifdef INCLUDE_DSL_SYSTEM_INTERFACE
+-DSL_Error_t DSL_DRV_SystemInterfaceStatusGet(
++static DSL_Error_t DSL_DRV_SystemInterfaceStatusGet(
+    DSL_Context_t *pContext,
+    DSL_SystemInterfaceStatus_t *pData)
+ {
+@@ -4372,7 +4372,7 @@ DSL_Error_t DSL_DRV_DBG_DebugFeatureConf
+ #endif /* DSL_DEBUG_DISABLE*/
+ 
+ #ifdef INCLUDE_DSL_FILTER_DETECTION
+-DSL_Error_t DSL_DRV_FilterDetectionDataGet(
++static DSL_Error_t DSL_DRV_FilterDetectionDataGet(
+    DSL_IN DSL_Context_t *pContext,
+    DSL_OUT DSL_FilterDetection_t *pData)
+ {
+@@ -4422,7 +4422,7 @@ DSL_Error_t DSL_DRV_FilterDetectionDataG
+ }
+ #endif /* INCLUDE_DSL_FILTER_DETECTION */
+ 
+-DSL_Error_t DSL_DRV_HybridSelectionDataGet(
++static DSL_Error_t DSL_DRV_HybridSelectionDataGet(
+    DSL_IN DSL_Context_t *pContext,
+    DSL_OUT DSL_HybridSelection_t *pData)
+ {
+@@ -4476,7 +4476,7 @@ DSL_Error_t DSL_DRV_HybridSelectionDataG
+    return nErrCode;
+ }
+ 
+-DSL_Error_t DSL_DRV_OlrStatisticsGet(
++static DSL_Error_t DSL_DRV_OlrStatisticsGet(
+    DSL_IN DSL_Context_t *pContext,
+    DSL_OUT DSL_OlrStatistics_t *pData)
+ {
+@@ -4596,7 +4596,7 @@ DSL_void_t DSL_DRV_InitDataFree(
+ #endif /* INCLUDE_DSL_INIT_DATA_PREPARE*/
+ }
+ 
+-DSL_Error_t DSL_DRV_IoctlHandleHelperCall(
++static DSL_Error_t DSL_DRV_IoctlHandleHelperCall(
+    DSL_OpenContext_t *pOpenCtx,
+    DSL_Context_t *pContext,
+    DSL_boolean_t bIsInKernel,
+--- a/src/common/drv_dsl_cpe_os_linux.c
++++ b/src/common/drv_dsl_cpe_os_linux.c
+@@ -1214,7 +1214,7 @@ static struct class *dsl_class;
+ static dev_t dsl_devt;
+ 
+ /* Entry point of driver */
+-int __init DSL_ModuleInit(void)
++static int __init DSL_ModuleInit(void)
+ {
+    DSL_int_t i;
+ 
+@@ -1262,7 +1262,7 @@ int __init DSL_ModuleInit(void)
+    return 0;
+ }
+ 
+-void __exit DSL_ModuleCleanup(void)
++static void __exit DSL_ModuleCleanup(void)
+ {
+    printk("Module will be unloaded"DSL_DRV_CRLF);
+ 
+--- a/src/g997/drv_dsl_cpe_api_g997_vrx.c
++++ b/src/g997/drv_dsl_cpe_api_g997_vrx.c
+@@ -11,6 +11,7 @@
+ #define DSL_INTERN
+ 
+ #include "drv_dsl_cpe_api.h"
++#include "drv_dsl_cpe_device_g997.h"
+ 
+ #ifdef INCLUDE_DSL_CPE_API_VRX
+