From f43624cf031cd387095ea12fd5714e49a087c555 Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Sat, 30 Nov 2024 17:46:10 +0100
Subject: ac97/audio: Add audio

Incomplete but still very cool
---
 kernel/audio.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 kernel/audio.c

(limited to 'kernel/audio.c')

diff --git a/kernel/audio.c b/kernel/audio.c
new file mode 100644
index 0000000..60df1f3
--- /dev/null
+++ b/kernel/audio.c
@@ -0,0 +1,32 @@
+// TODO: This should support multiple audio sources.
+#include <audio.h>
+#include <drivers/ac97.h>
+#include <errno.h>
+#include <fs/devfs.h>
+#include <math.h>
+
+int audio_write(u8 *buffer, u64 offset, u64 len, vfs_fd_t *fd) {
+  (void)offset;
+  (void)fd;
+  int rc = ac97_add_pcm(buffer, len);
+  if (0 == rc) {
+    return -EWOULDBLOCK;
+  }
+  return rc;
+}
+
+int audio_can_write(vfs_inode_t *inode) {
+  (void)inode;
+  return ac97_can_write();
+}
+
+static int add_files(void) {
+  devfs_add_file("/audio", NULL, audio_write, NULL, NULL, audio_can_write,
+                 FS_TYPE_CHAR_DEVICE);
+  return 1;
+}
+
+void audio_init(void) {
+  ac97_init();
+  add_files();
+}
-- 
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