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ps2: initially set all keyboard LEDs off

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This ensures a safe initial state and also informs the BIOS (resp.
notebook keyboards with dual-use keys for numpad) about our
assumptions.
This commit is contained in:
Christian Helmuth 2019-07-09 15:55:09 +02:00
parent c011d54158
commit 92bdcbf1fe
1 changed files with 21 additions and 7 deletions
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28
repos/os/src/drivers/input/spec/ps2/ps2_keyboard.h
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@ -380,24 +380,30 @@ class Ps2::Keyboard : public Input_driver
Led_state _led_state { };
Led_state _next_led_state { };
void _update_leds()
void _set_leds(bool capslock, bool numlock, bool scrlock)
{
/* don't interfere with pending events when applying next led state */
if (event_pending() || _led_state == _next_led_state)
return;
_kbd.write(0xed);
if (_kbd.read() != ACK) {
Genode::warning("setting of mode indicators failed (0xed)");
return;
}
_kbd.write((_next_led_state.capslock ? 4:0) | (_next_led_state.numlock ? 2:0)
| (_next_led_state.scrlock ? 1:0));
_kbd.write((capslock ? 4:0) | (numlock ? 2:0) | (scrlock ? 1:0));
if (_kbd.read() != ACK) {
Genode::warning("setting of mode indicators failed");
return;
}
}
void _update_leds()
{
/* don't interfere with pending events when applying next led state */
if (event_pending() || _led_state == _next_led_state)
return;
_set_leds(_next_led_state.capslock,
_next_led_state.numlock,
_next_led_state.scrlock);
_led_state = _next_led_state;
}
@ -447,6 +453,14 @@ class Ps2::Keyboard : public Input_driver
void reset()
{
/*
* We enforce an initial LED state with all indicators switched
* off. This also informs notebook keyboards (which use normal keys
* as numeric pad if numlock is enabled) about our initial
* assumption.
*/
_set_leds(false, false, false);
/* scan-code request/config commands */
enum { SCAN_CODE_REQUEST = 0, SCAN_CODE_SET_1 = 1, SCAN_CODE_SET_2 = 2 };