diff options
Diffstat (limited to 'board/poppy/base_detect_lux.c')
| -rw-r--r-- | board/poppy/base_detect_lux.c | 237 |
1 files changed, 0 insertions, 237 deletions
diff --git a/board/poppy/base_detect_lux.c b/board/poppy/base_detect_lux.c deleted file mode 100644 index c348eb681d..0000000000 --- a/board/poppy/base_detect_lux.c +++ /dev/null @@ -1,237 +0,0 @@ -/* Copyright 2018 The Chromium OS Authors. All rights reserved. - * Use of this source code is governed by a BSD-style license that can be - * found in the LICENSE file. - */ - -/* Lux base detection code */ - -#include "adc.h" -#include "board.h" -#include "chipset.h" -#include "common.h" -#include "console.h" -#include "extpower.h" -#include "gpio.h" -#include "hooks.h" -#include "host_command.h" -#include "system.h" -#include "tablet_mode.h" -#include "task.h" -#include "timer.h" -#include "util.h" - -#define CPRINTS(format, args...) cprints(CC_USB, format, ## args) -#define CPRINTF(format, args...) cprintf(CC_USB, format, ## args) - -/* Base detection and debouncing */ -#define BASE_DETECT_DEBOUNCE_US (20 * MSEC) - -/* - * If the base status is unclear (i.e. not within expected ranges, read - * the ADC value again every 500ms. - */ -#define BASE_DETECT_RETRY_US (500 * MSEC) - -/* - * When base is disconnected, and gets connected: - * Lid has 1M pull-up, base has 200K pull-down, so the ADC - * value should be around 200/(200+1000)*3300 = 550. - * - * Idle value should be ~3300: lid has 1M pull-up, and nothing else (i.e. ADC - * maxing out at 2813). - */ -#define BASE_DISCONNECTED_CONNECT_MIN_MV 450 -#define BASE_DISCONNECTED_CONNECT_MAX_MV 600 - -#define BASE_DISCONNECTED_MIN_MV 2800 -#define BASE_DISCONNECTED_MAX_MV (ADC_MAX_VOLT+1) - -/* - * When base is connected, then gets disconnected: - * Lid has 1M pull-up, lid has 10.0K pull-down, so the ADC - * value should be around 10.0/(10.0+1000)*3300 = 33. - * - * Idle level when connected should be: - * Lid has 10K pull-down, base has 5.1K pull-up, so the ADC value should be - * around 10.0/(10.0+5.1)*3300 = 2185 (actual value is 2153 as there is still - * a 1M pull-up on lid, and 200K pull-down on base). - */ -#define BASE_CONNECTED_DISCONNECT_MIN_MV 20 -#define BASE_CONNECTED_DISCONNECT_MAX_MV 40 - -#define BASE_CONNECTED_MIN_MV 2050 -#define BASE_CONNECTED_MAX_MV 2300 - -static uint64_t base_detect_debounce_time; - -static void base_detect_deferred(void); -DECLARE_DEFERRED(base_detect_deferred); - -enum base_status { - BASE_UNKNOWN = 0, - BASE_DISCONNECTED = 1, - BASE_CONNECTED = 2, -}; - -static enum base_status current_base_status; - -/** - * Board-specific routine to indicate if the base is connected. - */ -int board_is_base_connected(void) -{ - return current_base_status == BASE_CONNECTED; -} - -/** - * Board-specific routine to enable power distribution between lid and base - * (current can flow both ways). - * - * We only allow the base power to be enabled if the detection code knows that - * the base is connected. - */ -void board_enable_base_power(int enable) -{ - gpio_set_level(GPIO_PPVAR_VAR_BASE, - enable && current_base_status == BASE_CONNECTED); -} - -/* - * This function is called whenever there is a change in the base detect - * status. Actions taken include: - * 1. Enable/disable pull-down on half-duplex UART line - * 2. Disable power transfer between lid and base when unplugged. - * 3. Indicate mode change to host. - * 4. Indicate tablet mode to host. Current assumption is that if base is - * disconnected then the system is in tablet mode, else if the base is - * connected, then the system is not in tablet mode. - */ -static void base_detect_change(enum base_status status) -{ - int connected = (status == BASE_CONNECTED); - - if (current_base_status == status) - return; - - current_base_status = status; - - /* Enable pull-down if connected. */ - gpio_set_level(GPIO_EC_COMM_PD, !connected); - /* Disable power to/from base as quickly as possible. */ - if (!connected) - board_enable_base_power(0); - - /* - * Wake the charger task (it is responsible for enabling power to the - * base, and providing OTG power to the base if required). - */ - task_wake(TASK_ID_CHARGER); - - tablet_set_mode(!connected, TABLET_TRIGGER_BASE); -} - -static void print_base_detect_value(const char *str, int v) -{ - CPRINTS("Base %s. ADC: %d", str, v); -} - -static void base_detect_deferred(void) -{ - uint64_t time_now = get_time().val; - int v; - - if (base_detect_debounce_time > time_now) { - hook_call_deferred(&base_detect_deferred_data, - base_detect_debounce_time - time_now); - return; - } - - v = adc_read_channel(ADC_BASE_DET); - if (v == ADC_READ_ERROR) - goto retry; - - if (current_base_status == BASE_CONNECTED) { - if (v >= BASE_CONNECTED_DISCONNECT_MIN_MV && - v <= BASE_CONNECTED_DISCONNECT_MAX_MV) { - print_base_detect_value("disconnected", v); - base_detect_change(BASE_DISCONNECTED); - return; - } else if (v >= BASE_CONNECTED_MIN_MV && - v <= BASE_CONNECTED_MAX_MV) { - /* Still connected. */ - return; - } - } else { /* Disconnected or unknown. */ - if (v >= BASE_DISCONNECTED_CONNECT_MIN_MV && - v <= BASE_DISCONNECTED_CONNECT_MAX_MV) { - print_base_detect_value("connected", v); - base_detect_change(BASE_CONNECTED); - return; - } else if (v >= BASE_DISCONNECTED_MIN_MV && - v <= BASE_DISCONNECTED_MAX_MV) { - if (current_base_status == BASE_UNKNOWN) { - print_base_detect_value("disconnected", v); - base_detect_change(BASE_DISCONNECTED); - } - /* Still disconnected. */ - return; - } - } - -retry: - print_base_detect_value("status unclear", v); - /* Unclear base status, schedule again in a while. */ - hook_call_deferred(&base_detect_deferred_data, - BASE_DETECT_RETRY_US); -} - -void base_detect_interrupt(enum gpio_signal signal) -{ - uint64_t time_now = get_time().val; - - if (base_detect_debounce_time <= time_now) - hook_call_deferred(&base_detect_deferred_data, - BASE_DETECT_DEBOUNCE_US); - - base_detect_debounce_time = time_now + BASE_DETECT_DEBOUNCE_US; -} - -void board_base_reset(void) -{ - CPRINTS("Resetting base."); - base_detect_change(BASE_UNKNOWN); - hook_call_deferred(&base_detect_deferred_data, BASE_DETECT_RETRY_US); -} - -static void base_init(void) -{ - /* - * Make sure base power and pull-down are off. This will reset the base - * if it is already connected. - */ - board_enable_base_power(0); - gpio_set_level(GPIO_EC_COMM_PD, 1); - - /* Enable base detection interrupt. */ - hook_call_deferred(&base_detect_deferred_data, BASE_DETECT_DEBOUNCE_US); - gpio_enable_interrupt(GPIO_BASE_DET_A); -} -DECLARE_HOOK(HOOK_INIT, base_init, HOOK_PRIO_DEFAULT+1); - -void base_force_state(enum ec_set_base_state_cmd state) -{ - if (state == EC_SET_BASE_STATE_ATTACH) { - gpio_disable_interrupt(GPIO_BASE_DET_A); - base_detect_change(BASE_CONNECTED); - CPRINTS("BD forced connected"); - } else if (state == EC_SET_BASE_STATE_DETACH) { - gpio_disable_interrupt(GPIO_BASE_DET_A); - base_detect_change(BASE_DISCONNECTED); - CPRINTS("BD forced disconnected"); - } else { - hook_call_deferred(&base_detect_deferred_data, - BASE_DETECT_DEBOUNCE_US); - gpio_enable_interrupt(GPIO_BASE_DET_A); - CPRINTS("BD forced reset"); - } -} |