| /* Copyright (c) 2013 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. |
| */ |
| |
| /* Lid switch module for Chrome EC */ |
| |
| #include "common.h" |
| #include "console.h" |
| #include "gpio.h" |
| #include "hooks.h" |
| #include "host_command.h" |
| #include "lid_switch.h" |
| #include "timer.h" |
| #include "util.h" |
| |
| /* Console output macros */ |
| #define CPUTS(outstr) cputs(CC_SWITCH, outstr) |
| #define CPRINTS(format, args...) cprints(CC_SWITCH, format, ## args) |
| |
| #define LID_DEBOUNCE_US (30 * MSEC) /* Debounce time for lid switch */ |
| |
| /* if no X-macro is defined for LID switch GPIO, use GPIO_LID_OPEN as default */ |
| #ifndef CONFIG_LID_SWITCH_GPIO_LIST |
| #define CONFIG_LID_SWITCH_GPIO_LIST LID_GPIO(GPIO_LID_OPEN) |
| #endif |
| |
| static int debounced_lid_open; /* Debounced lid state */ |
| static int forced_lid_open; /* Forced lid open */ |
| |
| /** |
| * Get raw lid switch state. |
| * |
| * @return 1 if lid is open, 0 if closed. |
| */ |
| static int raw_lid_open(void) |
| { |
| #define LID_GPIO(gpio) || gpio_get_level(gpio) |
| return (forced_lid_open CONFIG_LID_SWITCH_GPIO_LIST) ? 1 : 0; |
| #undef LID_GPIO |
| } |
| |
| /** |
| * Handle lid open. |
| */ |
| static void lid_switch_open(void) |
| { |
| if (debounced_lid_open) { |
| CPRINTS("lid already open"); |
| return; |
| } |
| |
| CPRINTS("lid open"); |
| debounced_lid_open = 1; |
| hook_notify(HOOK_LID_CHANGE); |
| host_set_single_event(EC_HOST_EVENT_LID_OPEN); |
| } |
| |
| /** |
| * Handle lid close. |
| */ |
| static void lid_switch_close(void) |
| { |
| if (!debounced_lid_open) { |
| CPRINTS("lid already closed"); |
| return; |
| } |
| |
| CPRINTS("lid close"); |
| debounced_lid_open = 0; |
| hook_notify(HOOK_LID_CHANGE); |
| host_set_single_event(EC_HOST_EVENT_LID_CLOSED); |
| } |
| |
| test_mockable int lid_is_open(void) |
| { |
| return debounced_lid_open; |
| } |
| |
| /** |
| * Lid switch initialization code |
| */ |
| static void lid_init(void) |
| { |
| if (raw_lid_open()) |
| debounced_lid_open = 1; |
| |
| /* Enable interrupts, now that we've initialized */ |
| #define LID_GPIO(gpio) gpio_enable_interrupt(gpio); |
| CONFIG_LID_SWITCH_GPIO_LIST |
| #undef LID_GPIO |
| } |
| DECLARE_HOOK(HOOK_INIT, lid_init, HOOK_PRIO_INIT_LID); |
| |
| /** |
| * Handle debounced lid switch changing state. |
| */ |
| static void lid_change_deferred(void) |
| { |
| const int new_open = raw_lid_open(); |
| |
| /* If lid hasn't changed state, nothing to do */ |
| if (new_open == debounced_lid_open) |
| return; |
| |
| if (new_open) |
| lid_switch_open(); |
| else |
| lid_switch_close(); |
| } |
| DECLARE_DEFERRED(lid_change_deferred); |
| |
| void lid_interrupt(enum gpio_signal signal) |
| { |
| /* Reset lid debounce time */ |
| hook_call_deferred(lid_change_deferred, LID_DEBOUNCE_US); |
| } |
| |
| static int command_lidopen(int argc, char **argv) |
| { |
| lid_switch_open(); |
| return EC_SUCCESS; |
| } |
| DECLARE_CONSOLE_COMMAND(lidopen, command_lidopen, |
| NULL, |
| "Simulate lid open", |
| NULL); |
| |
| static int command_lidclose(int argc, char **argv) |
| { |
| lid_switch_close(); |
| return EC_SUCCESS; |
| } |
| DECLARE_CONSOLE_COMMAND(lidclose, command_lidclose, |
| NULL, |
| "Simulate lid close", |
| NULL); |
| |
| /** |
| * Host command to enable/disable lid opened. |
| */ |
| static int hc_force_lid_open(struct host_cmd_handler_args *args) |
| { |
| const struct ec_params_force_lid_open *p = args->params; |
| |
| /* Override lid open if necessary */ |
| forced_lid_open = p->enabled ? 1 : 0; |
| |
| /* Make this take effect immediately; no debounce time */ |
| hook_call_deferred(lid_change_deferred, 0); |
| |
| return EC_RES_SUCCESS; |
| } |
| DECLARE_HOST_COMMAND(EC_CMD_FORCE_LID_OPEN, hc_force_lid_open, |
| EC_VER_MASK(0)); |