static int
probe_keyboard(KBDC kbdc, int flags)
{
/*
* Don't try to print anything in this function. The low-level
* console may not have been initialized yet...
*/
int err;
int c;
int m;
if (!kbdc_lock(kbdc, TRUE)) {
/* driver error? */
return ENXIO;
}
/* flush any noise in the buffer */
empty_both_buffers(kbdc, 10);
/* save the current keyboard controller command byte */
m = kbdc_get_device_mask(kbdc) & ~KBD_KBD_CONTROL_BITS;
c = get_controller_command_byte(kbdc);
if (c == -1) {
/* CONTROLLER ERROR */
kbdc_set_device_mask(kbdc, m);
kbdc_lock(kbdc, FALSE);
return ENXIO;
}
/*
* The keyboard may have been screwed up by the boot block.
* We may just be able to recover from error by testing the controller
* and the keyboard port. The controller command byte needs to be
* saved before this recovery operation, as some controllers seem
* to set the command byte to particular values.
*/
test_controller(kbdc);
test_kbd_port(kbdc);
err = get_kbd_echo(kbdc);
if (err == 0) {
kbdc_set_device_mask(kbdc, m | KBD_KBD_CONTROL_BITS);
} else {
if (c != -1)
/* try to restore the command byte as before */
set_controller_command_byte(kbdc, 0xff, c);
kbdc_set_device_mask(kbdc, m);
}
kbdc_lock(kbdc, FALSE);
return err;
}
static int
probe_keyboard(KBDC kbdc, int flags)
{
/*
* Don't try to print anything in this function. The low-level
* console may not have been initialized yet...
*/
int err;
int c;
int m;
if (!kbdc_lock(kbdc, TRUE)) {
/* driver error? */
return ENXIO;
}
/* temporarily block data transmission from the keyboard */
write_controller_command(kbdc, KBDC_DISABLE_KBD_PORT);
/* flush any noise in the buffer */
empty_both_buffers(kbdc, 100);
/* save the current keyboard controller command byte */
m = kbdc_get_device_mask(kbdc) & ~KBD_KBD_CONTROL_BITS;
c = get_controller_command_byte(kbdc);
if (c == -1) {
/* CONTROLLER ERROR */
kbdc_set_device_mask(kbdc, m);
kbdc_lock(kbdc, FALSE);
return ENXIO;
}
/*
* The keyboard may have been screwed up by the boot block.
* We may just be able to recover from error by testing the controller
* and the keyboard port. The controller command byte needs to be
* saved before this recovery operation, as some controllers seem
* to set the command byte to particular values.
*/
test_controller(kbdc);
if (!(flags & KB_CONF_NO_PROBE_TEST))
test_kbd_port(kbdc);
err = get_kbd_echo(kbdc);
/*
* Even if the keyboard doesn't seem to be present (err != 0),
* we shall enable the keyboard port and interrupt so that
* the driver will be operable when the keyboard is attached
* to the system later. It is NOT recommended to hot-plug
* the AT keyboard, but many people do so...
*/
kbdc_set_device_mask(kbdc, m | KBD_KBD_CONTROL_BITS);
setup_kbd_port(kbdc, TRUE, TRUE);
#if 0
if (err == 0) {
kbdc_set_device_mask(kbdc, m | KBD_KBD_CONTROL_BITS);
} else {
/* try to restore the command byte as before */
set_controller_command_byte(kbdc, 0xff, c);
kbdc_set_device_mask(kbdc, m);
}
#endif
kbdc_lock(kbdc, FALSE);
return err;
}
