[U-Boot] [PATCH 1/1] efi_loader: correct CTRL-A - CTRL-Z console input

[Heinrich Schuchardt]

In the extended text input protocol CTRL-A - CTRL-Z have to be signaled as
Unicode characters a-z or A-Z depending on the shift state and not as 0x01
to 0x1a.

This patch is required for using the EFI shell `edit` command.

Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
---
 lib/efi_loader/efi_console.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/lib/efi_loader/efi_console.c b/lib/efi_loader/efi_console.c
index 8e0965bfc89..051fc1d339f 100644
--- a/lib/efi_loader/efi_console.c
+++ b/lib/efi_loader/efi_console.c
@@ -797,9 +797,26 @@ static efi_status_t EFIAPI efi_cin_read_key_stroke_ex(
 		ret = EFI_NOT_READY;
 		goto out;
 	}
+	/*
+	 * CTRL+A - CTRL+Z have to be signaled as a - z.
+	 * SHIFT+CTRL+A - SHIFT+CTRL+Z have to be signaled as A - Z.
+	 */
+	switch (next_key.key.unicode_char) {
+	case 0x01 ... 0x07:
+	case 0x0b ... 0x0c:
+	case 0x0e ... 0x1a:
+		if (!(next_key.key_state.key_toggle_state &
+		      EFI_CAPS_LOCK_ACTIVE) ^
+		    !(next_key.key_state.key_shift_state &
+		      (EFI_LEFT_SHIFT_PRESSED | EFI_RIGHT_SHIFT_PRESSED)))
+			next_key.key.unicode_char += 0x40;
+		else
+			next_key.key.unicode_char += 0x60;
+	}
 	*key_data = next_key;
 	key_available = false;
 	efi_con_in.wait_for_key->is_signaled = false;
+
 out:
 	return EFI_EXIT(ret);
 }
--
2.20.1