diff options
| -rw-r--r-- | board/cr50/power_button.c | 111 | ||||
| -rw-r--r-- | include/config.h | 3 |
2 files changed, 114 insertions, 0 deletions
diff --git a/board/cr50/power_button.c b/board/cr50/power_button.c index 5f46a4d0a6..a7d3634a00 100644 --- a/board/cr50/power_button.c +++ b/board/cr50/power_button.c @@ -56,10 +56,121 @@ static void power_button_press_enable_interrupt(int enable) } } +#ifdef CONFIG_AP_RO_VERIFICATION + +/* + * Implement sequence detecting trigger for starting AP RO verification. + * + * 'RCTD' is short for 'RO check trigger detection'. + * + * Start the detection sequence each time power button is pressed. While it is + * kept pressed, count number of presses of the refresh key. If the refresh + * key is pressed PRESS_COUNT times within RCTD_CUTOFF_TIME, consider the RO + * verification process triggered. + * + * If power button is released before the refresh key is pressed the required + * number of times, or the cutoff time expires, stop the sequence until the + * next power button press. + */ +static void rctd_poll(void); +DECLARE_DEFERRED(rctd_poll); + +#define RCTD_CUTOFF_TIME (3 * SECOND) +#define RCTD_POLL_INTERVAL (20 * MSEC) /* Poll buttons this often.*/ +#define DEBOUNCE_COUNT 2 /* Keyboard keys are pretty noisy, need debouncing. */ +#define PRESS_COUNT 3 + +/* + * Lower 32 bit of the timestamp when the sequence started. Is zero if the + * sequence is not running. + */ +static uint32_t rctd_start_time; + +/* + * rctd_poll_handler - periodically check states of power button and refresh + * key. + * + * Returns non-zero value if the polling needs to continue, or zero, if the + * polling should stop. + */ +static int rctd_poll_handler(void) +{ + uint32_t dior_state; + uint8_t ref_curr_state; + static uint8_t ref_press_count; + static uint8_t ref_last_state; + static uint8_t ref_debounced_state; + static uint8_t ref_debounce_counter; + + /* + * H1 DIORx pins provide current state of both the power button and + * escape key. + */ + dior_state = GREG32(RBOX, CHECK_INPUT); + ref_curr_state = !!(dior_state & GC_RBOX_CHECK_INPUT_KEY0_IN_MASK); + + if (rctd_start_time == 0) { + /* Start the new sequence. */ + rctd_start_time = get_time().le.lo; + ref_debounced_state = ref_last_state = ref_curr_state; + ref_debounce_counter = DEBOUNCE_COUNT; + ref_press_count = 0; + } else { + /* Have this been running longer than the timeout? */ + if ((get_time().le.lo - rctd_start_time) > RCTD_CUTOFF_TIME) { + CPRINTS("Timeout, no RO check triggered"); + return 0; + } + } + + + if ((dior_state & GC_RBOX_CHECK_INPUT_PWRB_IN_MASK) != 0) { + CPRINTS("Power button released, RO Check Detection stopped"); + return 0; + } + + if (ref_curr_state != ref_debounced_state) { + ref_debounced_state = ref_curr_state; + ref_debounce_counter = 0; + return 1; + } + + if (ref_debounce_counter >= DEBOUNCE_COUNT) + return 1; + + if (++ref_debounce_counter != DEBOUNCE_COUNT) + return 1; + + ref_last_state = ref_debounced_state; + if (!ref_last_state) + return 1; + + CPRINTS("Esc press registered"); + if (++ref_press_count != PRESS_COUNT) + return 1; + + CPRINTS("RO Validation triggered"); + return 0; +} + +static void rctd_poll(void) +{ + if (rctd_poll_handler()) + hook_call_deferred(&rctd_poll_data, RCTD_POLL_INTERVAL); + else + rctd_start_time = 0; +} +#endif + static void power_button_handler(void) { CPRINTS("power button pressed"); +#ifdef CONFIG_AP_RO_VERIFICATION + if (rctd_start_time == 0) + hook_call_deferred(&rctd_poll_data, 0); +#endif + if (physical_detect_press() != EC_SUCCESS) { /* Not consumed by physical detect */ #ifdef CONFIG_U2F diff --git a/include/config.h b/include/config.h index 5e556b7224..c2dbc278e0 100644 --- a/include/config.h +++ b/include/config.h @@ -1414,6 +1414,9 @@ /* Trigger building the image with all format strings extracted. */ #undef CONFIG_EXTRACT_PRINTF_STRINGS +/* Include AP RO verification support. */ +#undef CONFIG_AP_RO_VERIFICATION + /* * Enable EC-CR50 communication (a.k.a. EC-EFS2). This is for CR50 config only. */ |