openwrt/target/linux/brcm2708/patches-3.14/0052-fix-soc-core-s-inverse-range-and-let-IQaudIO-DAC-use.patch

From 7d86ec6d4ad388d8287a68d31ff3e3028477fd86 Mon Sep 17 00:00:00 2001
From: Gordon Garrity <gordon@iqaudio.com>
Date: Sun, 30 Mar 2014 13:52:33 +0100
Subject: [PATCH 52/54] fix soc-core's inverse range and let IQaudIO DAC use
 this fixed SOC_DOUBLE_R_RANGE_TLV support

---
 sound/soc/codecs/pcm512x.c | 3 ++-
 sound/soc/soc-core.c       | 8 ++++----
 2 files changed, 6 insertions(+), 5 deletions(-)

--- a/sound/soc/codecs/pcm512x.c
+++ b/sound/soc/codecs/pcm512x.c
@@ -239,9 +239,10 @@ static const struct soc_enum pcm512x_ved
 	SOC_ENUM_SINGLE(PCM512x_DIGITAL_MUTE_2, PCM512x_VEDS_SHIFT, 4,
 			pcm512x_ramp_step_text);
 
+/* Don't let the DAC go into clipping by limiting the alsa volume control range */
 static const struct snd_kcontrol_new pcm512x_controls[] = {
 SOC_DOUBLE_R_RANGE_TLV("Playback Digital Volume", PCM512x_DIGITAL_VOLUME_2,
-		 PCM512x_DIGITAL_VOLUME_3, 0, 48, 255, 1, digital_tlv),
+		 PCM512x_DIGITAL_VOLUME_3, 0, 40, 255, 1, digital_tlv),
 SOC_DOUBLE("Playback Digital Switch", PCM512x_MUTE, PCM512x_RQML_SHIFT,
 	   PCM512x_RQMR_SHIFT, 1, 1),
 
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -3072,8 +3072,8 @@ int snd_soc_put_volsw_range(struct snd_k
 
 	if (invert)
 		val = ((max - ucontrol->value.integer.value[0] + min) & mask);
-    else
-	val = (ucontrol->value.integer.value[0] & mask);
+	else
+		val = (ucontrol->value.integer.value[0] & mask);
 	val_mask = mask << shift;
 	val = val << shift;
 
@@ -3084,8 +3084,8 @@ int snd_soc_put_volsw_range(struct snd_k
 	if (snd_soc_volsw_is_stereo(mc)) {
 		if (invert)
 			val = ((max - ucontrol->value.integer.value[1] + min) & mask);
-        else
-            val = (ucontrol->value.integer.value[1] & mask);
+		else
+			val = (ucontrol->value.integer.value[1] & mask);
 		val_mask = mask << shift;
 		val = val << shift;