I have a pair of Athlon64 machines that dual-boot 32-bit and
64-bit kernels. One annoying difference between the kernels
is that the PC Speaker driver (CONFIG_INPUT_PCSPKR=y) only
works in the 32-bit kernels. In the 64-bit kernels it remains
inactive and doesn't even generate any boot-time initialisation
or error messages.
Today I debugged that issue, and found that the PC Speaker
driver's ->probe() routine doesn't even get called in the
64-bit kernels. The reason for that is that the arch code
apparently has to explictly add a "pcspkr" platform device
in order for the driver core to call the ->probe() routine.
arch/i386/kernel/setup.c unconditionally adds a "pcspkr"
device, but the x86_64 kernel has no code at all related to
the PC Speaker.
The patch below copies the relevant code from i386 to x86_64,
which makes the PC Speaker work for me on x86_64.
Is there a better way to do this? ACPI?
/Mikael
diff -rupN linux-2.6.17-rc3/arch/x86_64/kernel/setup.c linux-2.6.17-rc3.x86_64-pcspkr/arch/x86_64/kernel/setup.c
--- linux-2.6.17-rc3/arch/x86_64/kernel/setup.c 2006-04-28 20:54:10.000000000 +0200
+++ linux-2.6.17-rc3.x86_64-pcspkr/arch/x86_64/kernel/setup.c 2006-04-29 18:42:08.000000000 +0200
@@ -1426,3 +1426,22 @@ struct seq_operations cpuinfo_op = {
.show = show_cpuinfo,
};
+#ifdef CONFIG_INPUT_PCSPKR
+#include <linux/platform_device.h>
+static __init int add_pcspkr(void)
+{
+ struct platform_device *pd;
+ int ret;
+
+ pd = platform_device_alloc("pcspkr", -1);
+ if (!pd)
+ return -ENOMEM;
+
+ ret = platform_device_add(pd);
+ if (ret)
+ platform_device_put(pd);
+
+ return ret;
+}
+device_initcall(add_pcspkr);
+#endif
-
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