diff options
Diffstat (limited to 'payloads/libpayload/drivers/i8042/keyboard.c')
| -rw-r--r-- | payloads/libpayload/drivers/i8042/keyboard.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/payloads/libpayload/drivers/i8042/keyboard.c b/payloads/libpayload/drivers/i8042/keyboard.c index 22747ff79d..42d4fdccf5 100644 --- a/payloads/libpayload/drivers/i8042/keyboard.c +++ b/payloads/libpayload/drivers/i8042/keyboard.c @@ -28,6 +28,7 @@ */ #include <stdbool.h> +#include <stdint.h> #include <keycodes.h> #include <libpayload-config.h> @@ -173,9 +174,33 @@ static struct layout_maps keyboard_layouts[] = { static bool keyboard_cmd(unsigned char cmd) { + const uint64_t timeout_us = cmd == I8042_KBCMD_RESET ? 1*1000*1000 : 200*1000; + const uint64_t start_time = timer_us(0); + i8042_write_data(cmd); - return i8042_wait_read_ps2() == 0xfa; + do { + if (!i8042_data_ready_ps2()) { + udelay(50); + continue; + } + + const uint8_t data = i8042_read_data_ps2(); + switch (data) { + case 0xfa: + return true; + case 0xfe: + return false; + default: + /* Warn only if we already disabled keyboard input. */ + if (cmd != I8042_KBCMD_DEFAULT_DIS) + printf("WARNING: Keyboard sent spurious 0x%02x.\n", data); + break; + } + } while (timer_us(start_time) < timeout_us); + + printf("ERROR: Keyboard command timed out.\n"); + return false; } bool keyboard_havechar(void) |