From a3fe07ff128e521051aee8bc91add071724d6538 Mon Sep 17 00:00:00 2001
From: Dana Conrad <dconrad@fastmail.com>
Date: Tue, 21 Nov 2023 19:28:51 -0600
Subject: ErosQ New Revision HW volume

Add HW volume control via ES9018K2M, and reorganize
eros_qn_codec.c/.h, audiohw-erosqnative.c.

This automatically detects the presence of the new DAC and
uses its hardware volume scaling. If not present, use same
SWVOL we have been using so far.

Add debug menu readout of SWVOL/I2C result.

Break out es9018k2m stuff into its own file so that
maybe it can be useful to other ports.

Note that we may need to get smarter about detecting the DAC
type if/when another model emerges.

Change-Id: I586a1cf7f150dd6b4e221157859825952840af56
---
 .../erosqnative/audiohw-erosqnative.c              | 77 ++++++++++++++++++++--
 1 file changed, 71 insertions(+), 6 deletions(-)

(limited to 'firmware/target/mips/ingenic_x1000/erosqnative/audiohw-erosqnative.c')

diff --git a/firmware/target/mips/ingenic_x1000/erosqnative/audiohw-erosqnative.c b/firmware/target/mips/ingenic_x1000/erosqnative/audiohw-erosqnative.c
index c53da728ff..1e3e7f0b7f 100644
--- a/firmware/target/mips/ingenic_x1000/erosqnative/audiohw-erosqnative.c
+++ b/firmware/target/mips/ingenic_x1000/erosqnative/audiohw-erosqnative.c
@@ -19,13 +19,19 @@
  *
  ****************************************************************************/
 
-#include "audiohw.h"
 #include "system.h"
+#include "audiohw.h"
+#include "pcm_sw_volume.h"
 #include "pcm_sampr.h"
+#include "i2c-target.h"
+#include "button.h"
+
+// #define LOGF_ENABLE
+#include "logf.h"
+
 #include "aic-x1000.h"
 #include "i2c-x1000.h"
 #include "gpio-x1000.h"
-#include "logf.h"
 
 /*
  * Earlier devices audio path appears to be:
@@ -42,7 +48,7 @@ void audiohw_init(void)
     /* explicitly mute everything */
     gpio_set_level(GPIO_HPAMP_SHDN, 0);
     gpio_set_level(GPIO_STEREOSW_MUTE, 1);
-    gpio_set_level(GPIO_DAC_XMIT, 0);
+    gpio_set_level(GPIO_DAC_PWR, 0);
 
     aic_set_play_last_sample(true);
     aic_set_external_codec(true);
@@ -81,18 +87,34 @@ void audiohw_postinit(void)
     gpio_set_level(GPIO_STEREOSW_SEL, 0);
     gpio_set_level(GPIO_HPAMP_SHDN, 1);
     mdelay(10);
-    gpio_set_level(GPIO_DAC_XMIT, 1);
+    gpio_set_level(GPIO_DAC_PWR, 1);
     mdelay(10);
     gpio_set_level(GPIO_STEREOSW_MUTE, 0);
+
+    i2c_x1000_set_freq(ES9018K2M_BUS, I2C_FREQ_400K);
+
+    int ret = es9018k2m_read_reg(ES9018K2M_REG0_SYSTEM_SETTINGS);
+    if (ret >= 0) /* Detected ES9018K2M DAC */
+    {
+        logf("ES9018K2M found: ret=%d", ret);
+        es9018k2m_present_flag = 1;
+
+       /* Default is 32-bit data, and it works ok. Enabling the following
+        * causes issue. Which is weird, I definitely thought AIC was configured
+        * for 24-bit data... */
+        // es9018k2m_write_reg(ES9018K2M_REG1_INPUT_CONFIG, 0b01001100); // 24-bit data
+
+    } else { /* Default to SWVOL for PCM5102A DAC */
+        logf("Default to SWVOL: ret=%d", ret);
+    }
 }
 
-/* TODO: get shutdown just right according to dac datasheet */
 void audiohw_close(void)
 {
     /* mute - attempt to make power-off pop-free */
     gpio_set_level(GPIO_STEREOSW_MUTE, 1);
     mdelay(10);
-    gpio_set_level(GPIO_DAC_XMIT, 0);
+    gpio_set_level(GPIO_DAC_PWR, 0);
     mdelay(10);
     gpio_set_level(GPIO_HPAMP_SHDN, 0);
 }
@@ -107,3 +129,46 @@ void audiohw_set_frequency(int fsel)
     aic_enable_i2s_bit_clock(true);
 }
 
+void audiohw_set_volume(int vol_l, int vol_r)
+{
+    int l, r;
+
+    eros_qn_set_last_vol(vol_l, vol_r);
+
+    l = vol_l;
+    r = vol_r;
+
+#if (defined(HAVE_HEADPHONE_DETECTION) && defined(HAVE_LINEOUT_DETECTION))
+    /* make sure headphones aren't present - don't want to
+     * blow out our eardrums cranking it to full */
+    if (lineout_inserted() && !headphones_inserted())
+    {
+        eros_qn_switch_output(1);
+
+        l = r = eros_qn_get_volume_limit();
+    }
+    else
+    {
+        eros_qn_switch_output(0);
+    }
+#endif
+
+    if (es9018k2m_present_flag) /* ES9018K2M */
+    {
+        /* Same volume range and mute point for both DACs, so use PCM5102A_VOLUME_MIN */
+        l = l <= PCM5102A_VOLUME_MIN ? PCM_MUTE_LEVEL : l;
+        r = r <= PCM5102A_VOLUME_MIN ? PCM_MUTE_LEVEL : r;
+
+        /* set software volume just below unity due to
+         * DAC offset. We don't want to overflow the PCM system. */
+        pcm_set_master_volume(-1, -1);
+        es9018k2m_set_volume(l, r);
+    }
+    else /* PCM5102A */
+    {
+        l = l <= PCM5102A_VOLUME_MIN ? PCM_MUTE_LEVEL : (l / 20);
+        r = r <= PCM5102A_VOLUME_MIN ? PCM_MUTE_LEVEL : (r / 20);
+
+        pcm_set_master_volume(l, r);
+    }
+}
\ No newline at end of file
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