From 94313fed0373296af47857a8bb79cfc63127d9c9 Mon Sep 17 00:00:00 2001
From: RichardG867 <richardg867@gmail.com>
Date: Thu, 15 May 2025 17:44:54 -0300
Subject: [PATCH] AC97: Add Winbond W83971D codec

---
 src/include/86box/snd_ac97.h |  2 ++
 src/sound/snd_ac97_codec.c   | 25 +++++++++++++++++++++++--
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/src/include/86box/snd_ac97.h b/src/include/86box/snd_ac97.h
index 45a921863..a365f5afa 100644
--- a/src/include/86box/snd_ac97.h
+++ b/src/include/86box/snd_ac97.h
@@ -100,6 +100,7 @@
 #define AC97_CODEC_STAC9708 AC97_VENDOR_ID(0x83, 0x84, 0x76, 0x08)
 #define AC97_CODEC_STAC9721 AC97_VENDOR_ID(0x83, 0x84, 0x76, 0x09)
 #define AC97_CODEC_TR28023  AC97_VENDOR_ID('T', 'R', 'A', 0x03)
+#define AC97_CODEC_W83971D  AC97_VENDOR_ID('W', 'E', 'C', 0x01)
 #define AC97_CODEC_WM9701A  AC97_VENDOR_ID('W', 'M', 'L', 0x00)
 
 typedef struct ac97_vendor_reg_t {
@@ -150,6 +151,7 @@ extern const device_t cs4297a_device;
 extern const device_t stac9708_device;
 extern const device_t stac9721_device;
 extern const device_t tr28023_device;
+extern const device_t w83971d_device;
 extern const device_t wm9701a_device;
 
 extern const device_t ac97_via_device;
diff --git a/src/sound/snd_ac97_codec.c b/src/sound/snd_ac97_codec.c
index e92830f67..4a9c1e6c6 100644
--- a/src/sound/snd_ac97_codec.c
+++ b/src/sound/snd_ac97_codec.c
@@ -104,6 +104,12 @@ static const struct {
         .extid_flags = 0,
         .pcsr_mask   = 0x3f
     },
+    {
+        .device      = &w83971d_device,
+        .misc_flags  = AC97_MASTER_6B | AC97_MONOOUT | AC97_MONOOUT_6B | AC97_PCBEEP | AC97_PHONE | AC97_VIDEO | AC97_AUXIN | AC97_MS | AC97_LPBK,
+        .reset_flags = (27 << AC97_3D_SHIFT),
+        .pcsr_mask   = 0x3f
+    },
     {
         .device      = &wm9701a_device,
         .misc_flags  = AC97_AUXOUT | AC97_MONOOUT | AC97_PCBEEP | AC97_PHONE | AC97_VIDEO | AC97_AUXIN | AC97_MS | AC97_LPBK,
@@ -284,8 +290,9 @@ line_gain:
 
         case 0x22:      /* 3D Control */
             switch (ac97_codecs[dev->model].reset_flags >> AC97_3D_SHIFT) {
-                case 1: /* Analog Devices */
-                case 6: /* Crystal */
+                case 1:  /* Analog Devices */
+                case 6:  /* Crystal */
+                case 27: /* Winbond */
                     val &= 0x000f;
                     break;
 
@@ -764,6 +771,20 @@ const device_t tr28023_device = {
     .config        = NULL
 };
 
+const device_t w83971d_device = {
+    .name          = "Winbond W83971D",
+    .internal_name = "w83971d",
+    .flags         = DEVICE_AC97,
+    .local         = AC97_CODEC_W83971D,
+    .init          = ac97_codec_init,
+    .close         = ac97_codec_close,
+    .reset         = ac97_codec_reset,
+    .available     = NULL,
+    .speed_changed = NULL,
+    .force_redraw  = NULL,
+    .config        = NULL
+};
+
 const device_t wm9701a_device = {
     .name          = "Wolfson WM9701A",
     .internal_name = "wm9701a",