From cc031d41ab89daa06789fb28c0c1992a7928847a Mon Sep 17 00:00:00 2001
From: Amaury Pouly <amaury.pouly@gmail.com>
Date: Sun, 21 Aug 2016 20:27:17 +0100
Subject: wm8731: document audiohw settings

Change-Id: I78ec26a00a3e14a95c591ac81d96e1b480b9138e
---
 firmware/export/wm8731.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'firmware/export/wm8731.h')

diff --git a/firmware/export/wm8731.h b/firmware/export/wm8731.h
index 10925880c3..a725a87484 100644
--- a/firmware/export/wm8731.h
+++ b/firmware/export/wm8731.h
@@ -28,10 +28,10 @@
 
 AUDIOHW_SETTING(VOLUME,     "dB", 0,  1, -74,   6, -25)
 #if defined(HAVE_WM8731) && defined(HAVE_RECORDING)
-/* (x - 23)/1.5 *10 */
+/* Line in: 0 .. 31 => Volume -34.5 .. +12 dB */
 AUDIOHW_SETTING(LEFT_GAIN,  "dB", 1,  1,   0,  31,  23, (val - 23) * 15)
 AUDIOHW_SETTING(RIGHT_GAIN, "dB", 1,  1,   0,  31,  23, (val - 23) * 15)
-/* 0 or 20 dB */
+/* Microphone: 0 or 20 dB */
 AUDIOHW_SETTING(MIC_GAIN,   "dB", 1,  1,   0,   1,   0, val * 200)
 #endif /* defined(HAVE_WM8731) && defined(HAVE_RECORDING) */
 
-- 
cgit v1.2.3