From 78be63d5ccf7bc382d36c426ed5b80cba46e2afd Mon Sep 17 00:00:00 2001
From: MeowOS <meowos@local>
Date: Tue, 1 Sep 2026 16:08:01 +0800
Subject: [PATCH] =?UTF-8?q?feat(audio):=20CS43198=20=E9=9F=B3=E9=87=8F?=
 =?UTF-8?q?=E6=8C=89=20DS1039=20=E6=95=B0=E6=8D=AE=E6=89=8B=E5=86=8C?=
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 =?UTF-8?q?=E6=96=B9=E9=94=A5=E5=BA=A6=E6=98=A0=E5=B0=84(dB=E8=A1=B0?=
 =?UTF-8?q?=E5=87=8F=3D(1-pct)=C2=B2=C3=9796dB,=20pct=3D0=E2=86=92?=
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---
 meow_ui_vol.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/meow_ui_vol.c b/meow_ui_vol.c
index 6269bad..b10cf35 100644
--- a/meow_ui_vol.c
+++ b/meow_ui_vol.c
@@ -110,9 +110,10 @@ int meow_ui_vol_step(const char *path, int dir)
  * 与 launcher meow_dac_vol_write / watchdog wd_vol_write 完全同路径（语义同源）。 */
 void meow_ui_vol_dac_write(int pct)
 {
-    int dac = 255 - pct * 255 / 100;   /* CS43198 寄存器=衰减量(0=最响 255=静音)，用户 pct 越大越响 → 反转映射 */
-    if (dac < 0) dac = 0;
-    if (dac > 255) dac = 255;
+    int t = 100 - pct, dac;
+	if (pct <= 0) dac = 255;                    /* 真静音（DS1039：255=-127.5dB） */
+	else dac = t * t * 192 / 10000;             /* 感知平方锥度：dB 衰减=(1-pct)^2×96dB */
+	if (dac > 255) dac = 255; if (dac < 0) dac = 0;  /* CS43198=衰减量(0最响255静音)+平方锥度(听感线性) */
     char cmd[160];
     snprintf(cmd, sizeof cmd,
              "amixer -c 0 cset numid=1 %d >/dev/null 2>&1; amixer -c 0 cset numid=2 %d >/dev/null 2>&1",