staging: r8188eu: make c2h_evt_read() static

The function c2h_evt_read() is only used in rtw_cmd.c.
Make it static.

This addresses the TODO item:
* Remove the HAL layer and migrate its functionality into the relevant
  parts of the driver.

Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220909100232.8305-1-straube.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_cmd.c

@@ -1277,6 +1277,66 @@ u8 rtw_c2h_wk_cmd(struct adapter *padapter, u8 *c2h_evt)
 	return res;
 }
 
+/* C2H event format:
+ * Field    TRIGGER      CONTENT     CMD_SEQ    CMD_LEN    CMD_ID
+ * BITS     [127:120]    [119:16]    [15:8]     [7:4]      [3:0]
+ */
+static s32 c2h_evt_read(struct adapter *adapter, u8 *buf)
+{
+	s32 ret = _FAIL;
+	struct c2h_evt_hdr *c2h_evt;
+	int i;
+	u8 trigger;
+
+	if (!buf)
+		goto exit;
+
+	ret = rtw_read8(adapter, REG_C2HEVT_CLEAR, &trigger);
+	if (ret)
+		return _FAIL;
+
+	if (trigger == C2H_EVT_HOST_CLOSE)
+		goto exit; /* Not ready */
+	else if (trigger != C2H_EVT_FW_CLOSE)
+		goto clear_evt; /* Not a valid value */
+
+	c2h_evt = (struct c2h_evt_hdr *)buf;
+
+	memset(c2h_evt, 0, 16);
+
+	ret = rtw_read8(adapter, REG_C2HEVT_MSG_NORMAL, buf);
+	if (ret) {
+		ret = _FAIL;
+		goto clear_evt;
+	}
+
+	ret = rtw_read8(adapter, REG_C2HEVT_MSG_NORMAL + 1, buf + 1);
+	if (ret) {
+		ret = _FAIL;
+		goto clear_evt;
+	}
+	/* Read the content */
+	for (i = 0; i < c2h_evt->plen; i++) {
+		ret = rtw_read8(adapter, REG_C2HEVT_MSG_NORMAL +
+				sizeof(*c2h_evt) + i, c2h_evt->payload + i);
+		if (ret) {
+			ret = _FAIL;
+			goto clear_evt;
+		}
+	}
+
+	ret = _SUCCESS;
+
+clear_evt:
+	/* Clear event to notify FW we have read the command.
+	 * If this field isn't clear, the FW won't update the next
+	 * command message.
+	 */
+	rtw_write8(adapter, REG_C2HEVT_CLEAR, C2H_EVT_HOST_CLOSE);
+exit:
+	return ret;
+}
+
 static void c2h_evt_hdl(struct adapter *adapter, struct c2h_evt_hdr *c2h_evt, c2h_id_filter filter)
 {
 	u8 buf[16];

drivers/staging/r8188eu/hal/hal_com.c

@@ -137,66 +137,3 @@ void HalSetBrateCfg(struct adapter *adapt, u8 *brates, u16 *rate_cfg)
 		}
 	}
 }
-
-/*
-* C2H event format:
-* Field	 TRIGGER		CONTENT	   CMD_SEQ	CMD_LEN		 CMD_ID
-* BITS	 [127:120]	[119:16]      [15:8]		  [7:4]		   [3:0]
-*/
-
-s32 c2h_evt_read(struct adapter *adapter, u8 *buf)
-{
-	s32 ret = _FAIL;
-	struct c2h_evt_hdr *c2h_evt;
-	int i;
-	u8 trigger;
-
-	if (!buf)
-		goto exit;
-
-	ret = rtw_read8(adapter, REG_C2HEVT_CLEAR, &trigger);
-	if (ret)
-		return _FAIL;
-
-	if (trigger == C2H_EVT_HOST_CLOSE)
-		goto exit; /* Not ready */
-	else if (trigger != C2H_EVT_FW_CLOSE)
-		goto clear_evt; /* Not a valid value */
-
-	c2h_evt = (struct c2h_evt_hdr *)buf;
-
-	memset(c2h_evt, 0, 16);
-
-	ret = rtw_read8(adapter, REG_C2HEVT_MSG_NORMAL, buf);
-	if (ret) {
-		ret = _FAIL;
-		goto clear_evt;
-	}
-
-	ret = rtw_read8(adapter, REG_C2HEVT_MSG_NORMAL + 1, buf + 1);
-	if (ret) {
-		ret = _FAIL;
-		goto clear_evt;
-	}
-	/* Read the content */
-	for (i = 0; i < c2h_evt->plen; i++) {
-		ret = rtw_read8(adapter, REG_C2HEVT_MSG_NORMAL +
-						sizeof(*c2h_evt) + i, c2h_evt->payload + i);
-		if (ret) {
-			ret = _FAIL;
-			goto clear_evt;
-		}
-	}
-
-	ret = _SUCCESS;
-
-clear_evt:
-	/*
-	* Clear event to notify FW we have read the command.
-	* If this field isn't clear, the FW won't update the next
-	* command message.
-	*/
-	rtw_write8(adapter, REG_C2HEVT_CLEAR, C2H_EVT_HOST_CLOSE);
-exit:
-	return ret;
-}

drivers/staging/r8188eu/include/hal_com.h

@@ -143,6 +143,4 @@ u8 MRateToHwRate(u8 rate);
 
 void HalSetBrateCfg(struct adapter *Adapter, u8 *mBratesOS, u16 *pBrateCfg);
 
-s32 c2h_evt_read(struct adapter *adapter, u8 *buf);
-
 #endif /* __HAL_COMMON_H__ */