efi/console: Implement getkeystatus() support

Implement getkeystatus() support in the EFI console driver.

This is needed because the logic to determine if a key was pressed to make
the menu countdown stop will be changed by a later patch to also take into
account the SHIFT key being held down.

For this reason the EFI console driver has to support getkeystatus() to
allow detecting that event.

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>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

diff --git a/grub-core/term/efi/console.c b/grub-core/term/efi/console.c
index 0cb965a9931d8c0cd15c9e28d4456d03e5d8a27e..64591b90aadb2758b29f606106d7827f05a47518 100644 (file)
--- a/grub-core/term/efi/console.c
+++ b/grub-core/term/efi/console.c
@@ -260,6 +260,39 @@ 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)
 {
@@ -372,6 +405,7 @@ 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,
   };