[PATCH] EFI: console: Fix the "enter" key not working on X86 tablets

[Hans de Goede]

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 <address@hidden>
---
 grub-core/term/efi/console.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/grub-core/term/efi/console.c b/grub-core/term/efi/console.c
index 02f64ea74..1867bad1a 100644
--- a/grub-core/term/efi/console.c
+++ b/grub-core/term/efi/console.c
@@ -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];
 
-- 
2.17.1