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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 6 Jun 2018 16:16:47 +0200
Subject: [PATCH] EFI: console: Implement getkeystatus() support

Implement getkeystatus() support.

Note that if a non-modifier key gets pressed and repeated calls to
getkeystatus() are made then it will return the modifier status at the
time of the non-modifier key, until that key-press gets consumed by a
getkey() call.

This is a side-effect of how the EFI simple-text-input protocol works
and cannot be avoided.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 grub-core/term/efi/console.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/grub-core/term/efi/console.c b/grub-core/term/efi/console.c
index 3d36c5c701b..92dd4996bb7 100644
--- a/grub-core/term/efi/console.c
+++ b/grub-core/term/efi/console.c
@@ -223,6 +223,39 @@ grub_console_getkey_ex(struct grub_term_input *term)
   return key;
 }
 
+static int
+grub_console_getkeystatus(struct grub_term_input *term)
+{
+  grub_efi_key_data_t key_data;
+  grub_efi_uint32_t kss;
+  int key, mods = 0;
+
+  if (grub_efi_is_finished)
+    return 0;
+
+  if (grub_console_read_key_stroke (term->data, &key_data, &key, 0))
+    return 0;
+
+  kss = key_data.key_state.key_shift_state;
+  if (kss & GRUB_EFI_SHIFT_STATE_VALID)
+    {
+      if (kss & GRUB_EFI_LEFT_SHIFT_PRESSED)
+        mods |= GRUB_TERM_STATUS_LSHIFT;
+      if (kss & GRUB_EFI_RIGHT_SHIFT_PRESSED)
+        mods |= GRUB_TERM_STATUS_RSHIFT;
+      if (kss & GRUB_EFI_LEFT_ALT_PRESSED)
+        mods |= GRUB_TERM_STATUS_LALT;
+      if (kss & GRUB_EFI_RIGHT_ALT_PRESSED)
+        mods |= GRUB_TERM_STATUS_RALT;
+      if (kss & GRUB_EFI_LEFT_CONTROL_PRESSED)
+        mods |= GRUB_TERM_STATUS_LCTRL;
+      if (kss & GRUB_EFI_RIGHT_CONTROL_PRESSED)
+        mods |= GRUB_TERM_STATUS_RCTRL;
+    }
+
+  return mods;
+}
+
 static grub_err_t
 grub_efi_console_input_init (struct grub_term_input *term)
 {
@@ -403,6 +436,7 @@ static struct grub_term_input grub_console_term_input =
   {
     .name = "console",
     .getkey = grub_console_getkey,
+    .getkeystatus = grub_console_getkeystatus,
     .init = grub_efi_console_input_init,
   };