From 8f5555b052788679db705d19573b4729843a2169 Mon Sep 17 00:00:00 2001
From: Jared Boone <jboone@earfeast.com>
Date: Wed, 31 May 2017 11:32:32 -0700
Subject: [PATCH] WM8731: Store headphone volume for mute() function.

So when unmuted, previous volume can be restored.
---
 firmware/common/wm8731.hpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/firmware/common/wm8731.hpp b/firmware/common/wm8731.hpp
index 87790b865..1f6b3e537 100644
--- a/firmware/common/wm8731.hpp
+++ b/firmware/common/wm8731.hpp
@@ -307,6 +307,7 @@ public:
 
 	void set_headphone_volume(const volume_t volume) {
 		const auto normalized = headphone_gain_range.normalize(volume);
+		headphone_volume = volume;
 		auto n = normalized.centibel() / 10;
 
 		write(LeftHeadphoneOut {
@@ -337,6 +338,7 @@ private:
 	I2C& bus;
 	const I2C::address_t bus_address;
 	RegisterMap map { default_after_reset };
+	volume_t headphone_volume = -60.0_dB;
 
 	bool write(const Register reg);