Kernel: Try to detect Sound Blaster 16 before creating an instance

We shouldn't create a SB16 instance without checking if the Sound Blaster 16 card is actually installed in the system.
Author: https://github.com/supercomputer7 Commit: f2faf11d61 Pull-request: https://github.com/SerenityOS/serenity/pull/5237 Issue: https://github.com/SerenityOS/serenity/issues/5234
2025-08-18 08:20:44 +00:00 · 2021-02-05 08:18:46 +02:00 · 2021-02-05 08:18:46 +02:00 · f2faf11d61 · 2024-07-18 22:35:22 +09:00
commit f2faf11d61
parent 5bb35da784
3 changed files with 16 additions and 2 deletions
--- a/Kernel/Devices/SB16.cpp
+++ b/Kernel/Devices/SB16.cpp
@ -89,6 +89,19 @@ SB16::~SB16()
 {
 }

+void SB16::detect()
+{
+    IO::out8(0x226, 1);
+    IO::delay(32);
+    IO::out8(0x226, 0);
+
+    auto data = dsp_read();
+    if (data != 0xaa) {
+        return;
+    }
+    SB16::create();
+}
+
 void SB16::create()
 {
    s_the.ensure_instance();