Add Xuelin iHIFI 770/770C/800 support

Taken from the xvortex fork (Roman Stolyarov)
Ported, rebased, and cleaned up by myself.

Change-Id: I7b2bca2d29502f2e4544e42f3d122786dd4b7978

1 files changed, 134 insertions, 0 deletions

diff --git a/firmware/drivers/audio/es9018.c b/firmware/drivers/audio/es9018.c
new file mode 100644
index 0000000000..89e8c1d46f
--- /dev/null
+++ b/firmware/drivers/audio/es9018.c
@@ -0,0 +1,134 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2016 by 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 "system.h"
+#include "es9018.h"
+#include "config.h"
+#include "audio.h"
+#include "audiohw.h"
+
+/* NOTE:  The register names are not known, as the register numbering
+   listed in the ES9018 datasheet does not match what is described below.. */
+
+static uint8_t reg0  = 0x00; /* System settings. Default value of register 0 */
+static uint8_t reg1  = 0x80; /* Input settings. Manual input, I2S, 32-bit (?) */
+static uint8_t reg4  = 0x00; /* Automute time. Default = disabled */
+static uint8_t reg5  = 0x68; /* Automute level. Default is some level */
+static uint8_t reg6  = 0x4A; /* Deemphasis. Default = disabled */
+static uint8_t reg7  = 0x83; /* General settings. Default sharp fir, pcm iir and muted */
+static uint8_t reg8  = 0x10; /* GPIO configuration */
+static uint8_t reg10 = 0x05; /* Master Mode Control. Default value: master mode off */
+static uint8_t reg11 = 0x02; /* Channel Mapping. Default stereo is Ch1=left, Ch2=right */
+static uint8_t reg12 = 0x50; /* DPLL Settings. Default = 005 for I2S, OFF for DSD */
+static uint8_t reg13 = 0x40; /* THD Compensation */
+static uint8_t reg14 = 0x8A; /* Soft Start Settings */
+static uint8_t reg21 = 0x00; /* Oversampling filter. Default: oversampling ON */
+
+#define bitSet(value, bit) ((value) |= (1UL << (bit)))
+#define bitClear(value, bit) ((value) &= ~(1UL << (bit)))
+
+static int vol_tenthdb2hw(const int tdb)
+{
+    if (tdb < ES9018_VOLUME_MIN) {
+        return 0xff;
+    } else if (tdb > ES9018_VOLUME_MAX) {
+        return 0x00;
+    } else {
+        return (-tdb/5);
+    }
+}
+
+void audiohw_set_volume(int vol_l, int vol_r)
+{
+    es9018_write_reg(15, vol_tenthdb2hw(vol_l));
+    es9018_write_reg(16, vol_tenthdb2hw(vol_r));
+}
+
+void audiohw_mute(void)
+{
+    bitSet(reg7, 0); /* Mute Channel 1 */
+    bitSet(reg7, 1); /* Mute Channel 2 */
+    es9018_write_reg(0x07, reg7);
+}
+
+void audiohw_unmute(void)
+{
+    bitClear(reg7, 0); /* Unmute Channel 1 */
+    bitClear(reg7, 1); /* Unmute Channel 2 */
+    es9018_write_reg(0x07, reg7);
+}
+
+void audiohw_init(void)
+{
+    es9018_write_reg(0x00, reg0);
+    es9018_write_reg(0x01, reg1);
+    es9018_write_reg(0x04, reg4);
+    es9018_write_reg(0x05, reg5);
+    es9018_write_reg(0x06, reg6);
+    es9018_write_reg(0x07, reg7);
+    es9018_write_reg(0x08, reg8);
+    es9018_write_reg(0x0A, reg10);
+    es9018_write_reg(0x0B, reg11);
+    es9018_write_reg(0x0C, reg12);
+    es9018_write_reg(0x0D, reg13);
+    es9018_write_reg(0x0E, reg14);
+    es9018_write_reg(0x15, reg21);
+}
+
+void audiohw_preinit(void)
+{
+}
+
+void audiohw_set_frequency(int fsel)
+{
+    (void)fsel;
+}
+
+void audiohw_set_filter_roll_off(int value)
+{
+    /* 0 = Sharp (Default)
+       1 = Slow
+       2 = Short
+       3 = Bypass */
+    switch(value)
+    {
+        case 0:
+            bitClear(reg7, 5);
+            bitClear(reg7, 6);
+            bitClear(reg21, 0);
+            break;
+        case 1:
+            bitSet(reg7, 5);
+            bitClear(reg7, 6);
+            bitClear(reg21, 0);
+            break;
+        case 2:
+            bitClear(reg7, 5);
+            bitSet(reg7, 6);
+            bitClear(reg21, 0);
+            break;
+        case 3:
+            bitSet(reg21, 0);
+            break;
+    }
+    es9018_write_reg(0x07, reg7);
+    es9018_write_reg(0x15, reg21);
+}