From aabc8aca47e60cf745a34af28c50679fcb967910 Mon Sep 17 00:00:00 2001
From: Solomon Peachy <pizza@shaftnet.org>
Date: Sat, 3 Oct 2020 18:17:11 -0400
Subject: New port:  FiiO M3K

Most credit goes to:  Roman Skylarov
Additional integration and refactoring by myself.

 *** COMPLETELY UNTESTED ***

Change-Id: Ia64c36d92e0214c6b15f7a868df286f8113ea27b
---
 firmware/drivers/audio/fiiolinux_codec.c | 154 +++++++++++++++++++++++++++++++
 1 file changed, 154 insertions(+)
 create mode 100644 firmware/drivers/audio/fiiolinux_codec.c

(limited to 'firmware/drivers/audio')

diff --git a/firmware/drivers/audio/fiiolinux_codec.c b/firmware/drivers/audio/fiiolinux_codec.c
new file mode 100644
index 0000000000..d8024e3c32
--- /dev/null
+++ b/firmware/drivers/audio/fiiolinux_codec.c
@@ -0,0 +1,154 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ *
+ * Copyright (c) 2018 Marcin Bukat
+ * Copyright (c) 2019 Roman Stolyarov
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "config.h"
+#include "audio.h"
+#include "audiohw.h"
+#include "system.h"
+#include "kernel.h"
+#include "panic.h"
+#include "sysfs.h"
+#include "alsa-controls.h"
+#include "pcm-alsa.h"
+#include <sys/ioctl.h>
+
+static int fd_hw;
+static int ak_hw;
+
+static      int vol_sw[2] = {0};
+static long int vol_hw[2] = {0};
+
+static void hw_open(void)
+{
+    fd_hw = open("/dev/snd/controlC0", O_RDWR);
+    if(fd_hw < 0)
+        panicf("Cannot open '/dev/snd/controlC0'");
+
+    ak_hw = open("/dev/ak4376", O_RDWR);
+    if(ak_hw < 0)
+        panicf("Cannot open '/dev/ak4376'");
+
+    if(ioctl(ak_hw, 0x20003424, 0) < 0)
+    {
+        panicf("Call cmd AK4376_POWER_ON fail");
+    }
+}
+
+static void hw_close(void)
+{
+    if(ioctl(ak_hw, 0x20003425, 0) < 0)
+    {
+        panicf("Call cmd AK4376_POWER_OFF fail");
+    }
+    close(ak_hw);
+
+    close(fd_hw);
+}
+
+void audiohw_preinit(void)
+{
+    alsa_controls_init();
+    hw_open();
+}
+
+void audiohw_postinit(void)
+{
+}
+
+void audiohw_close(void)
+{
+    hw_close();
+    alsa_controls_close();
+}
+
+void audiohw_set_frequency(int fsel)
+{
+    (void)fsel;
+}
+
+void audiohw_set_volume(int vol_l, int vol_r)
+{
+    int vol[2];
+   
+    vol[0] = vol_l / 20;
+    vol[1] = vol_r / 20;
+
+    for (int i = 0; i < 2; i++)
+    {
+        if (vol[i] > -56)
+        {
+            if (vol[i] < -12)
+            {
+                vol_hw[i] = 1;
+                vol_sw[i] = vol[i] + 12;
+            }
+            else
+            {
+                vol_hw[i] = 25 - (-vol[i] * 2);
+                vol_sw[i] = 0;
+            }
+        }
+        else
+        {
+            // Mute
+            vol_hw[i] = 0;
+            vol_sw[i] = 0;
+        }
+    }
+
+    alsa_controls_set_ints("DACL Playback Volume", 1, &vol_hw[0]);
+    alsa_controls_set_ints("DACR Playback Volume", 1, &vol_hw[1]);
+    pcm_alsa_set_digital_volume(vol_sw[0], vol_sw[1]);
+}
+
+void audiohw_mute(int mute)
+{
+    long int vol0 = 0;
+
+    if(mute)
+    {
+        alsa_controls_set_ints("DACL Playback Volume", 1, &vol0);
+        alsa_controls_set_ints("DACR Playback Volume", 1, &vol0);
+        pcm_alsa_set_digital_volume(0, 0);
+    }
+    else
+    {
+        alsa_controls_set_ints("DACL Playback Volume", 1, &vol_hw[0]);
+        alsa_controls_set_ints("DACR Playback Volume", 1, &vol_hw[1]);
+        pcm_alsa_set_digital_volume(vol_sw[0], vol_sw[1]);
+    }
+}
+
+void audiohw_set_filter_roll_off(int value)
+{
+    /* 0 = Sharp;
+       1 = Slow;
+       2 = Short Sharp
+       3 = Short Slow */
+#if defined(FIIO_M3K)
+    long int value_hw = value;
+    alsa_controls_set_ints("AK4376 Digital Filter", 1, &value_hw);
+#else
+    (void)value;
+#endif
+}
-- 
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