diff options
Diffstat (limited to 'payloads')
| -rw-r--r-- | payloads/libpayload/drivers/i8042/keyboard.c | 176 |
1 files changed, 138 insertions, 38 deletions
diff --git a/payloads/libpayload/drivers/i8042/keyboard.c b/payloads/libpayload/drivers/i8042/keyboard.c index 9da3902168..dcba031268 100644 --- a/payloads/libpayload/drivers/i8042/keyboard.c +++ b/payloads/libpayload/drivers/i8042/keyboard.c @@ -209,9 +209,139 @@ static bool keyboard_cmd(unsigned char cmd) return false; } +static bool set_scancode_set(const unsigned char set) +{ + bool ret; + + if (set < 1 || set > 3) + return false; + + ret = keyboard_cmd(I8042_KBCMD_SET_SCANCODE); + if (!ret) { + printf("ERROR: Keyboard set scancode failed!\n"); + return ret; + } + + ret = keyboard_cmd(set); + if (!ret) { + printf("ERROR: Keyboard scancode set#%u failed!\n", set); + return ret; + } + + return ret; +} + +static enum keyboard_state { + STATE_INIT = 0, + STATE_DISABLE_SCAN, + STATE_DRAIN_INPUT, + STATE_DISABLE_TRANSLATION, + STATE_CONFIGURE, + STATE_CONFIGURE_SET1, + STATE_ENABLE_TRANSLATION, + STATE_ENABLE_SCAN, + STATE_RUNNING, + STATE_IGNORE, +} keyboard_state; + +static uint64_t keyboard_time; + +static void keyboard_poll(void) +{ + enum keyboard_state next_state = keyboard_state; + unsigned int i; + + switch (keyboard_state) { + + case STATE_INIT: + /* Wait until keyboard_init() has been called. */ + break; + + case STATE_DISABLE_SCAN: + (void)keyboard_cmd(I8042_KBCMD_DEFAULT_DIS); + next_state = STATE_DRAIN_INPUT; + break; + + case STATE_DRAIN_INPUT: + /* Limit number of bytes drained per poll. */ + for (i = 0; i < 50 && i8042_data_ready_ps2(); ++i) + (void)i8042_read_data_ps2(); + if (i == 0) + next_state = STATE_DISABLE_TRANSLATION; + break; + + case STATE_DISABLE_TRANSLATION: + /* Be opportunistic and assume it's disabled on failure. */ + (void)i8042_set_kbd_translation(false); + next_state = STATE_CONFIGURE; + break; + + case STATE_CONFIGURE: + if (set_scancode_set(2)) + next_state = STATE_ENABLE_TRANSLATION; + else + next_state = STATE_CONFIGURE_SET1; + break; + + case STATE_CONFIGURE_SET1: + if (!set_scancode_set(1)) { + printf("ERROR: Keyboard failed to set any scancode set.\n"); + next_state = STATE_DISABLE_SCAN; + break; + } + + next_state = STATE_ENABLE_SCAN; + break; + + case STATE_ENABLE_TRANSLATION: + if (i8042_set_kbd_translation(true) != 0) { + printf("ERROR: Keyboard controller set translation failed!\n"); + next_state = STATE_DISABLE_SCAN; + break; + } + + next_state = STATE_ENABLE_SCAN; + break; + + case STATE_ENABLE_SCAN: + if (!keyboard_cmd(I8042_KBCMD_EN)) { + printf("ERROR: Keyboard enable scanning failed!\n"); + next_state = STATE_DISABLE_SCAN; + break; + } + + next_state = STATE_RUNNING; + break; + + case STATE_RUNNING: + /* TODO: Use echo command to detect detach. */ + break; + + case STATE_IGNORE: + /* TODO: Try again after timeout if it ever seems useful. */ + break; + + } + + switch (next_state) { + case STATE_INIT: + case STATE_RUNNING: + case STATE_IGNORE: + break; + default: + if (timer_us(keyboard_time) > 30*1000*1000) + next_state = STATE_IGNORE; + break; + } + + if (keyboard_state != next_state) + keyboard_state = next_state; +} + bool keyboard_havechar(void) { - return i8042_data_ready_ps2(); + keyboard_poll(); + return keyboard_state == STATE_RUNNING && i8042_data_ready_ps2(); } unsigned char keyboard_get_scancode(void) @@ -344,30 +474,11 @@ static struct console_input_driver cons = { .input_type = CONSOLE_INPUT_TYPE_EC, }; -static bool set_scancode_set(const unsigned char set) -{ - bool ret; - - if (set < 1 || set > 3) - return false; - - ret = keyboard_cmd(I8042_KBCMD_SET_SCANCODE); - if (!ret) { - printf("ERROR: Keyboard set scancode failed!\n"); - return ret; - } - - ret = keyboard_cmd(set); - if (!ret) { - printf("ERROR: Keyboard scancode set#%u failed!\n", set); - return ret; - } - - return ret; -} - void keyboard_init(void) { + if (keyboard_state != STATE_INIT) + return; + map = &keyboard_layouts[0]; /* Initialized keyboard controller. */ @@ -377,21 +488,8 @@ void keyboard_init(void) /* Enable first PS/2 port */ i8042_cmd(I8042_CMD_EN_KB); - /* Disable scanning */ - keyboard_cmd(I8042_KBCMD_DEFAULT_DIS); - keyboard_drain_input(); - - i8042_set_kbd_translation(false); - - if (set_scancode_set(2)) - i8042_set_kbd_translation(true); - else if (!set_scancode_set(1)) - return; /* give up, leave keyboard input disabled */ - - /* Enable scanning */ - const bool ret = keyboard_cmd(I8042_KBCMD_EN); - if (!ret) - printf("ERROR: Keyboard enable scanning failed!\n"); + keyboard_state = STATE_DISABLE_SCAN; + keyboard_time = timer_us(0); console_add_input_driver(&cons); } @@ -418,4 +516,6 @@ void keyboard_disconnect(void) /* Release keyboard controller driver */ i8042_close(); + + keyboard_state = STATE_INIT; } |