platform/x86: apple-gmux: add debugfs interface

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Allow reading and writing gmux ports from userspace.

For example:

echo 4 > /sys/kernel/debug/apple_gmux/selected_port
cat /sys/kernel/debug/apple_gmux/selected_port_data | xxd -p

Will show the gmux version information (00000005 in this case)

Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Orlando Chamberlain <orlandoch.dev@gmail.com>
Link: https://lore.kernel.org/r/20230303112842.3094-5-orlandoch.dev@gmail.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

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Orlando Chamberlain 2023-03-03 22:28:43 +11:00 • committed by Hans de Goede

parent 0c18184de9

commit f863fac1b1

1 changed files with 82 additions and 0 deletions

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drivers/platform/x86/apple-gmux.c

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