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efi: serial: Support arrow keys 

At present only the backspace key is supported in U-Boot, when running as
an EFI app. Add support for arrows, home and end as well, to make the CLI
more friendly.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This commit is contained in:
Simon Glass 2021-12-29 11:57:37 -07:00 committed by Heinrich Schuchardt
parent 613cd0c467
commit 2996066110
1 changed files with 9 additions and 2 deletions
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11
drivers/serial/serial_efi.c
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@ -24,6 +24,9 @@ struct serial_efi_priv {
bool have_key; bool have_key;
}; };
/* Convert a lower-case character to its ctrl-char equivalent */
#define CTL_CH(c) ((c) - 'a' + 1)
int serial_efi_setbrg(struct udevice *dev, int baudrate) int serial_efi_setbrg(struct udevice *dev, int baudrate)
{ {
return 0; return 0;
@ -49,6 +52,7 @@ static int serial_efi_get_key(struct serial_efi_priv *priv)
static int serial_efi_getc(struct udevice *dev) static int serial_efi_getc(struct udevice *dev)
{ {
struct serial_efi_priv *priv = dev_get_priv(dev); struct serial_efi_priv *priv = dev_get_priv(dev);
char conv_scan[10] = {0, 'p', 'n', 'f', 'b', 'a', 'e', 0, 8};
int ret, ch; int ret, ch;
ret = serial_efi_get_key(priv); ret = serial_efi_get_key(priv);
@ -63,8 +67,11 @@ static int serial_efi_getc(struct udevice *dev)
* key scan code of 8. Handle this so that backspace works correctly * key scan code of 8. Handle this so that backspace works correctly
* in the U-Boot command line. * in the U-Boot command line.
*/ */
if (!ch && priv->key.scan_code == 8) if (!ch && priv->key.scan_code < sizeof(conv_scan)) {
ch = 8; ch = conv_scan[priv->key.scan_code];
if (ch >= 'a')
ch -= 'a' - 1;
}
debug(" [%x %x %x] ", ch, priv->key.unicode_char, priv->key.scan_code); debug(" [%x %x %x] ", ch, priv->key.unicode_char, priv->key.scan_code);
return ch; return ch;