1 files changed, 119 insertions, 0 deletions

diff --git a/firmware/drivers/audio/es9018k2m.c b/firmware/drivers/audio/es9018k2m.c
new file mode 100644
index 0000000000..e19cf6e8a9
--- /dev/null
+++ b/firmware/drivers/audio/es9018k2m.c
@@ -0,0 +1,119 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ *
+ * Copyright (c) 2023 Dana Conrad
+ *
+ * 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 "es9018k2m.h"
+#include "i2c-async.h"
+#include "action.h"
+
+//======================================================================================
+// ES9018K2M support stuff
+
+#ifndef ES9018K2M_BUS
+# error "No definition for ES9018K2M I2C bus!"
+#endif
+
+#ifndef ES9018K2M_ADDR
+# error "No definition for ES9018K2M I2C address!"
+#endif
+
+static int vol_tenthdb2hw(const int tdb)
+{
+    if (tdb < ES9018K2M_VOLUME_MIN) {
+        return 0xff;
+    } else if (tdb > ES9018K2M_VOLUME_MAX) {
+        return 0x00;
+    } else {
+        return (-tdb/5);
+    }
+}
+
+/* NOTE: This implementation is for the ES9018K2M specifically. */
+/* Register defaults from the datasheet. */
+/* These are basically just for reference. All defaults work out for us.
+ * static uint8_t reg0_system_settings         = 0x00; // System settings. Default value of register 0
+ * static uint8_t reg1_input_configuration     = 0x8C; // Input settings. I2S input, 32-bit
+ * static uint8_t reg4_automute_time           = 0x00; // Automute time. Default = disabled
+ * static uint8_t reg5_automute_level          = 0x68; // Automute level. Default is some level
+ * static uint8_t reg6_deemphasis              = 0x4A; // Deemphasis. Default = disabled
+ * static uint8_t reg7_general_settings        = 0x80; // General settings. Default sharp fir, pcm iir and unmuted
+ * static uint8_t reg8_gpio_configuration      = 0x10; // GPIO configuration
+ * static uint8_t reg10_master_mode_control    = 0x05; // Master Mode Control. Default value: master mode off
+ * static uint8_t reg11_channel_mapping        = 0x02; // Channel Mapping. Default stereo is Ch1=left, Ch2=right
+ * static uint8_t reg12_dpll_settings          = 0x5A; // DPLL Settings. Default = 5 for I2S, A for DSD
+ * static uint8_t reg13_thd_comp               = 0x40; // THD Compensation
+ * static uint8_t reg14_softstart_settings     = 0x8A; // Soft Start Settings
+ * static uint8_t reg21_gpio_input_selection   = 0x00; // Oversampling filter. Default: oversampling ON
+ */
+
+static uint8_t vol_reg_l = ES9018K2M_REG15_VOLUME_L;
+static uint8_t reg15_vol_l = 0;
+i2c_descriptor vol_desc_l = {
+    .slave_addr = ES9018K2M_ADDR,
+    .bus_cond = I2C_START | I2C_STOP,
+    .tran_mode = I2C_WRITE,
+    .buffer[0] = &vol_reg_l,
+    .count[0] = 1,
+    .buffer[1] = &reg15_vol_l,
+    .count[1] = 1,
+    .callback = NULL,
+    .arg = 0,
+    .next = NULL,
+};
+
+static uint8_t vol_reg_r = ES9018K2M_REG16_VOLUME_R;
+static uint8_t reg16_vol_r = 0;
+i2c_descriptor vol_desc_r = {
+    .slave_addr = ES9018K2M_ADDR,
+    .bus_cond = I2C_START | I2C_STOP,
+    .tran_mode = I2C_WRITE,
+    .buffer[0] = &vol_reg_r,
+    .count[0] = 1,
+    .buffer[1] = &reg16_vol_r,
+    .count[1] = 1,
+    .callback = NULL,
+    .arg = 0,
+    .next = NULL,
+};
+
+void es9018k2m_set_volume(int vol_l, int vol_r)
+{
+    /* Queue writes to the DAC's volume.
+     * Note that this needs to be done asynchronously. From testing, calling
+     * synchronous writes from HP/LO detect causes hangs. */
+    reg15_vol_l = vol_tenthdb2hw(vol_l);
+    reg16_vol_r = vol_tenthdb2hw(vol_r);
+    i2c_async_queue(ES9018K2M_BUS, TIMEOUT_NOBLOCK, I2C_Q_ADD, 0, &vol_desc_l);
+    i2c_async_queue(ES9018K2M_BUS, TIMEOUT_NOBLOCK, I2C_Q_ADD, 0, &vol_desc_r);
+}
+
+/* returns I2C_STATUS_OK upon success, I2C_STATUS_* errors upon error */
+int es9018k2m_write_reg(uint8_t reg, uint8_t val)
+{
+    return i2c_reg_write1(ES9018K2M_BUS, ES9018K2M_ADDR, reg, val);
+}
+
+/* returns register value, or -1 upon error */
+int es9018k2m_read_reg(uint8_t reg)
+{
+    return i2c_reg_read1(ES9018K2M_BUS, ES9018K2M_ADDR, reg);
+}
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