diff options
Diffstat (limited to 'payloads/libpayload/drivers/i8042')
| -rw-r--r-- | payloads/libpayload/drivers/i8042/keyboard.c | 49 |
1 files changed, 47 insertions, 2 deletions
diff --git a/payloads/libpayload/drivers/i8042/keyboard.c b/payloads/libpayload/drivers/i8042/keyboard.c index 114e18bc40..14089bd51e 100644 --- a/payloads/libpayload/drivers/i8042/keyboard.c +++ b/payloads/libpayload/drivers/i8042/keyboard.c @@ -233,9 +233,12 @@ static bool set_scancode_set(const unsigned char set) static enum keyboard_state { STATE_INIT = 0, + STATE_SIMPLIFIED_INIT, STATE_DISABLE_SCAN, STATE_DRAIN_INPUT, STATE_DISABLE_TRANSLATION, + STATE_START_SELF_TEST, + STATE_SELF_TEST, STATE_CONFIGURE, STATE_CONFIGURE_SET1, STATE_ENABLE_TRANSLATION, @@ -258,6 +261,15 @@ static void keyboard_poll(void) /* Wait until keyboard_init() has been called. */ break; + case STATE_SIMPLIFIED_INIT: + /* On the first try, start opportunistically, do + the first steps at once and skip the self-test. */ + (void)keyboard_cmd(I8042_KBCMD_DEFAULT_DIS); + keyboard_drain_input(); + (void)i8042_set_kbd_translation(false); + next_state = STATE_CONFIGURE; + break; + case STATE_DISABLE_SCAN: (void)keyboard_cmd(I8042_KBCMD_DEFAULT_DIS); next_state = STATE_DRAIN_INPUT; @@ -274,7 +286,40 @@ static void keyboard_poll(void) case STATE_DISABLE_TRANSLATION: /* Be opportunistic and assume it's disabled on failure. */ (void)i8042_set_kbd_translation(false); - next_state = STATE_CONFIGURE; + next_state = STATE_START_SELF_TEST; + break; + + case STATE_START_SELF_TEST: + if (!keyboard_cmd(I8042_KBCMD_RESET)) + printf("ERROR: Keyboard self-test couldn't be started.\n"); + /* We ignore errors and always move to the self-test state + which will simply try again if necessary. */ + next_state = STATE_SELF_TEST; + break; + + case STATE_SELF_TEST: + if (!i8042_data_ready_ps2()) { + if (timer_us(state_time) > 5*1000*1000) + next_state = STATE_DISABLE_SCAN; + break; + } + + const uint8_t self_test_result = i8042_read_data_ps2(); + switch (self_test_result) { + case 0xaa: + /* Success! */ + next_state = STATE_CONFIGURE; + break; + case 0xfc: + case 0xfd: + /* Failure. Try again. */ + next_state = STATE_START_SELF_TEST; + break; + default: + printf("WARNING: Keyboard self-test received spurious 0x%02x\n", + self_test_result); + break; + } break; case STATE_CONFIGURE: @@ -491,7 +536,7 @@ void keyboard_init(void) /* Enable first PS/2 port */ i8042_cmd(I8042_CMD_EN_KB); - keyboard_state = STATE_DISABLE_SCAN; + keyboard_state = STATE_SIMPLIFIED_INIT; keyboard_time = state_time = timer_us(0); console_add_input_driver(&cons); |