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| author | Hans de Goede <hdegoede@redhat.com> | 2021-01-25 23:52:58 +0300 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2021-02-02 17:03:12 +0300 |
| commit | 9e9c64131f47b0016911b76cebfcda6b1bb3b7b7 (patch) | |
| tree | 5e2c77a23648cce245cba0bb075dc09fdfd3fb12 /drivers | |
| parent | 64b0efa18f8c3b1baac369b8d74d0fdae02bc4bc (diff) | |
| download | linux-9e9c64131f47b0016911b76cebfcda6b1bb3b7b7.tar.xz | |
platform/x86: thinkpad_acpi: Don't register keyboard_lang unnecessarily
All recent ThinkPad BIOS-es support the GSKL method used to query the
keyboard-layout used by the ECFW for the SHIFT + other-key key-press
emulation for special keys such as e.g. the '=', '(' and ')' keys
above the numpad on 15" models.
So just checking for the method is not a good indicator of the
model supporting getting/setting the keyboard_lang.
On models where this is not supported GSKL succeeds, but it returns
METHOD_ERR in the returned integer to indicate that this is not
supported on this model.
Add a check for METHOD_ERR and return -ENODEV if it is set to
avoid registering a non-working keyboard_lang sysfs-attr on models
where this is not supported.
Cc: Nitin Joshi <njoshi1@lenovo.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20210125205258.135664-1-hdegoede@redhat.com
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/platform/x86/thinkpad_acpi.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c index 81f8ad6bb688..4a1dba3099a6 100644 --- a/drivers/platform/x86/thinkpad_acpi.c +++ b/drivers/platform/x86/thinkpad_acpi.c @@ -10047,6 +10047,13 @@ static int get_keyboard_lang(int *output) if (!acpi_evalf(gskl_handle, &kbd_lang, NULL, "dd", 0x02000000)) return -EIO; + /* + * METHOD_ERR gets returned on devices where there are no special (e.g. '=', + * '(' and ')') keys which use layout dependent key-press emulation. + */ + if (kbd_lang & METHOD_ERR) + return -ENODEV; + *output = kbd_lang; return 0; |