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efi/console: Fix the "enter" key not working on x86 tablets 

Most 8" or 7" x86 Windows 10 tablets come with volume up/down buttons and
a power-button. In their UEFI these are almost always mapped to arrow
up/down and enter.

Pressing the volume buttons (sometimes by accident) will stop the
menu countdown, but the power-button / "enter" key was not being recognized
as enter, so the user would be stuck at the grub menu.

The problem is that these tablets send scan_code 13 or 0x0d for the
power-button, which officialy maps to the F3 key. They also set
unicode_char to 0x0d.

This commit recognizes the special case of both scan_code and unicode_char
being set to 0x0d and treats this as an enter key press.

This fixes things getting stuck at the grub-menu and allows the user
to choice a grub-menu entry using the buttons on the tablet.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Hans de Goede 2018-06-26 20:15:01 +02:00 committed by Daniel Kiper
parent 4e9d9358e0
commit edece25a77
1 changed files with 3 additions and 0 deletions
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3
grub-core/term/efi/console.c
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@ -122,6 +122,9 @@ grub_efi_translate_key (grub_efi_input_key_t key)
else
return key.unicode_char;
}
/* Some devices send enter with scan_code 0x0d (F3) and unicode_char 0x0d. */
else if (key.scan_code == '\r' && key.unicode_char == '\r')
return key.unicode_char;
else if (key.scan_code < ARRAY_SIZE (efi_codes))
return efi_codes[key.scan_code];