1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/staging/r8188eu/core/rtw_rf.c b/drivers/staging/r8188eu/core/rtw_rf.c
new file mode 100644
index 000000000..2d2f0fc4c
--- /dev/null
+++ b/drivers/staging/r8188eu/core/rtw_rf.c
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright(c) 2007 - 2011 Realtek Corporation. */
+
+#include "../include/drv_types.h"
+
+static const u32 ch_freq_map[] = {
+	2412,
+	2417,
+	2422,
+	2427,
+	2432,
+	2437,
+	2442,
+	2447,
+	2452,
+	2457,
+	2462,
+	2467,
+	2472,
+	2484
+};
+
+u32 rtw_ch2freq(u32 channel)
+{
+	if (channel == 0 || channel > ARRAY_SIZE(ch_freq_map))
+		return 2412;
+
+	return ch_freq_map[channel - 1];
+}