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input/ps2: defer led update on pending events

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Issue #2888
This commit is contained in:
Christian Helmuth 2018-08-17 14:40:54 +02:00
parent d909715f1b
commit db376bfddb
1 changed files with 27 additions and 7 deletions
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34
repos/os/src/drivers/input/spec/ps2/ps2_keyboard.h
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@ -365,23 +365,41 @@ class Ps2::Keyboard : public Input_driver
*/
Scan_code_state_machine *_state_machine = nullptr;
bool _capslock = false;
bool _numlock = false;
bool _scrlock = false;
struct Led_state
{
bool capslock = false;
bool numlock = false;
bool scrlock = false;
bool operator == (Led_state const &other) const {
return other.capslock == capslock
&& other.numlock == numlock
&& other.scrlock == scrlock; }
};
Led_state _led_state { };
Led_state _next_led_state { };
void _update_leds()
{
/* 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((_capslock ? 4:0) | (_numlock ? 2:0) | (_scrlock ? 1:0));
_kbd.write((_next_led_state.capslock ? 4:0) | (_next_led_state.numlock ? 2:0)
| (_next_led_state.scrlock ? 1:0));
if (_kbd.read() != ACK) {
Genode::warning("setting of mode indicators failed");
return;
}
_led_state = _next_led_state;
}
public:
@ -420,9 +438,9 @@ class Ps2::Keyboard : public Input_driver
void led_enabled(Led led, bool enabled)
{
switch (led) {
case CAPSLOCK_LED: _capslock = enabled; break;
case NUMLOCK_LED: _numlock = enabled; break;
case SCRLOCK_LED: _scrlock = enabled; break;
case CAPSLOCK_LED: _next_led_state.capslock = enabled; break;
case NUMLOCK_LED: _next_led_state.numlock = enabled; break;
case SCRLOCK_LED: _next_led_state.scrlock = enabled; break;
}
_update_leds();
}
@ -476,6 +494,7 @@ class Ps2::Keyboard : public Input_driver
*/
if (_key_state[key_code] == press) {
_state_machine->reset();
_update_leds();
return;
}
@ -499,6 +518,7 @@ class Ps2::Keyboard : public Input_driver
/* start with new packet */
_state_machine->reset();
_update_leds();
}
bool event_pending() const { return _kbd.data_read_ready(); }