| // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
| /****************************************************************************** |
| * |
| * Module Name: evxfevnt - External Interfaces, ACPI event disable/enable |
| * |
| * Copyright (C) 2000 - 2018, Intel Corp. |
| * |
| *****************************************************************************/ |
| |
| #define EXPORT_ACPI_INTERFACES |
| |
| #include <acpi/acpi.h> |
| #include "accommon.h" |
| #include "actables.h" |
| |
| #define _COMPONENT ACPI_EVENTS |
| ACPI_MODULE_NAME("evxfevnt") |
| |
| #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_enable |
| * |
| * PARAMETERS: None |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Transfers the system into ACPI mode. |
| * |
| ******************************************************************************/ |
| acpi_status acpi_enable(void) |
| { |
| acpi_status status; |
| int retry; |
| |
| ACPI_FUNCTION_TRACE(acpi_enable); |
| |
| /* ACPI tables must be present */ |
| |
| if (acpi_gbl_fadt_index == ACPI_INVALID_TABLE_INDEX) { |
| return_ACPI_STATUS(AE_NO_ACPI_TABLES); |
| } |
| |
| /* If the Hardware Reduced flag is set, machine is always in acpi mode */ |
| |
| if (acpi_gbl_reduced_hardware) { |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| /* Check current mode */ |
| |
| if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) { |
| ACPI_DEBUG_PRINT((ACPI_DB_INIT, |
| "System is already in ACPI mode\n")); |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| /* Transition to ACPI mode */ |
| |
| status = acpi_hw_set_mode(ACPI_SYS_MODE_ACPI); |
| if (ACPI_FAILURE(status)) { |
| ACPI_ERROR((AE_INFO, |
| "Could not transition to ACPI mode")); |
| return_ACPI_STATUS(status); |
| } |
| |
| /* Sanity check that transition succeeded */ |
| |
| for (retry = 0; retry < 30000; ++retry) { |
| if (acpi_hw_get_mode() == ACPI_SYS_MODE_ACPI) { |
| if (retry != 0) |
| ACPI_WARNING((AE_INFO, |
| "Platform took > %d00 usec to enter ACPI mode", retry)); |
| return_ACPI_STATUS(AE_OK); |
| } |
| acpi_os_stall(100); /* 100 usec */ |
| } |
| |
| ACPI_ERROR((AE_INFO, "Hardware did not enter ACPI mode")); |
| return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); |
| } |
| |
| ACPI_EXPORT_SYMBOL(acpi_enable) |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_disable |
| * |
| * PARAMETERS: None |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Transfers the system into LEGACY (non-ACPI) mode. |
| * |
| ******************************************************************************/ |
| acpi_status acpi_disable(void) |
| { |
| acpi_status status = AE_OK; |
| |
| ACPI_FUNCTION_TRACE(acpi_disable); |
| |
| /* If the Hardware Reduced flag is set, machine is always in acpi mode */ |
| |
| if (acpi_gbl_reduced_hardware) { |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| if (acpi_hw_get_mode() == ACPI_SYS_MODE_LEGACY) { |
| ACPI_DEBUG_PRINT((ACPI_DB_INIT, |
| "System is already in legacy (non-ACPI) mode\n")); |
| } else { |
| /* Transition to LEGACY mode */ |
| |
| status = acpi_hw_set_mode(ACPI_SYS_MODE_LEGACY); |
| |
| if (ACPI_FAILURE(status)) { |
| ACPI_ERROR((AE_INFO, |
| "Could not exit ACPI mode to legacy mode")); |
| return_ACPI_STATUS(status); |
| } |
| |
| ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI mode disabled\n")); |
| } |
| |
| return_ACPI_STATUS(status); |
| } |
| |
| ACPI_EXPORT_SYMBOL(acpi_disable) |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_enable_event |
| * |
| * PARAMETERS: event - The fixed eventto be enabled |
| * flags - Reserved |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Enable an ACPI event (fixed) |
| * |
| ******************************************************************************/ |
| acpi_status acpi_enable_event(u32 event, u32 flags) |
| { |
| acpi_status status = AE_OK; |
| u32 value; |
| |
| ACPI_FUNCTION_TRACE(acpi_enable_event); |
| |
| /* If Hardware Reduced flag is set, there are no fixed events */ |
| |
| if (acpi_gbl_reduced_hardware) { |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| /* Decode the Fixed Event */ |
| |
| if (event > ACPI_EVENT_MAX) { |
| return_ACPI_STATUS(AE_BAD_PARAMETER); |
| } |
| |
| /* |
| * Enable the requested fixed event (by writing a one to the enable |
| * register bit) |
| */ |
| status = |
| acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. |
| enable_register_id, ACPI_ENABLE_EVENT); |
| if (ACPI_FAILURE(status)) { |
| return_ACPI_STATUS(status); |
| } |
| |
| /* Make sure that the hardware responded */ |
| |
| status = |
| acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. |
| enable_register_id, &value); |
| if (ACPI_FAILURE(status)) { |
| return_ACPI_STATUS(status); |
| } |
| |
| if (value != 1) { |
| ACPI_ERROR((AE_INFO, |
| "Could not enable %s event", |
| acpi_ut_get_event_name(event))); |
| return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); |
| } |
| |
| return_ACPI_STATUS(status); |
| } |
| |
| ACPI_EXPORT_SYMBOL(acpi_enable_event) |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_disable_event |
| * |
| * PARAMETERS: event - The fixed event to be disabled |
| * flags - Reserved |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Disable an ACPI event (fixed) |
| * |
| ******************************************************************************/ |
| acpi_status acpi_disable_event(u32 event, u32 flags) |
| { |
| acpi_status status = AE_OK; |
| u32 value; |
| |
| ACPI_FUNCTION_TRACE(acpi_disable_event); |
| |
| /* If Hardware Reduced flag is set, there are no fixed events */ |
| |
| if (acpi_gbl_reduced_hardware) { |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| /* Decode the Fixed Event */ |
| |
| if (event > ACPI_EVENT_MAX) { |
| return_ACPI_STATUS(AE_BAD_PARAMETER); |
| } |
| |
| /* |
| * Disable the requested fixed event (by writing a zero to the enable |
| * register bit) |
| */ |
| status = |
| acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. |
| enable_register_id, ACPI_DISABLE_EVENT); |
| if (ACPI_FAILURE(status)) { |
| return_ACPI_STATUS(status); |
| } |
| |
| status = |
| acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. |
| enable_register_id, &value); |
| if (ACPI_FAILURE(status)) { |
| return_ACPI_STATUS(status); |
| } |
| |
| if (value != 0) { |
| ACPI_ERROR((AE_INFO, |
| "Could not disable %s events", |
| acpi_ut_get_event_name(event))); |
| return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE); |
| } |
| |
| return_ACPI_STATUS(status); |
| } |
| |
| ACPI_EXPORT_SYMBOL(acpi_disable_event) |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_clear_event |
| * |
| * PARAMETERS: event - The fixed event to be cleared |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Clear an ACPI event (fixed) |
| * |
| ******************************************************************************/ |
| acpi_status acpi_clear_event(u32 event) |
| { |
| acpi_status status = AE_OK; |
| |
| ACPI_FUNCTION_TRACE(acpi_clear_event); |
| |
| /* If Hardware Reduced flag is set, there are no fixed events */ |
| |
| if (acpi_gbl_reduced_hardware) { |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| /* Decode the Fixed Event */ |
| |
| if (event > ACPI_EVENT_MAX) { |
| return_ACPI_STATUS(AE_BAD_PARAMETER); |
| } |
| |
| /* |
| * Clear the requested fixed event (By writing a one to the status |
| * register bit) |
| */ |
| status = |
| acpi_write_bit_register(acpi_gbl_fixed_event_info[event]. |
| status_register_id, ACPI_CLEAR_STATUS); |
| |
| return_ACPI_STATUS(status); |
| } |
| |
| ACPI_EXPORT_SYMBOL(acpi_clear_event) |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_get_event_status |
| * |
| * PARAMETERS: event - The fixed event |
| * event_status - Where the current status of the event will |
| * be returned |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Obtains and returns the current status of the event |
| * |
| ******************************************************************************/ |
| acpi_status acpi_get_event_status(u32 event, acpi_event_status * event_status) |
| { |
| acpi_status status; |
| acpi_event_status local_event_status = 0; |
| u32 in_byte; |
| |
| ACPI_FUNCTION_TRACE(acpi_get_event_status); |
| |
| if (!event_status) { |
| return_ACPI_STATUS(AE_BAD_PARAMETER); |
| } |
| |
| /* Decode the Fixed Event */ |
| |
| if (event > ACPI_EVENT_MAX) { |
| return_ACPI_STATUS(AE_BAD_PARAMETER); |
| } |
| |
| /* Fixed event currently can be dispatched? */ |
| |
| if (acpi_gbl_fixed_event_handlers[event].handler) { |
| local_event_status |= ACPI_EVENT_FLAG_HAS_HANDLER; |
| } |
| |
| /* Fixed event currently enabled? */ |
| |
| status = |
| acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. |
| enable_register_id, &in_byte); |
| if (ACPI_FAILURE(status)) { |
| return_ACPI_STATUS(status); |
| } |
| |
| if (in_byte) { |
| local_event_status |= |
| (ACPI_EVENT_FLAG_ENABLED | ACPI_EVENT_FLAG_ENABLE_SET); |
| } |
| |
| /* Fixed event currently active? */ |
| |
| status = |
| acpi_read_bit_register(acpi_gbl_fixed_event_info[event]. |
| status_register_id, &in_byte); |
| if (ACPI_FAILURE(status)) { |
| return_ACPI_STATUS(status); |
| } |
| |
| if (in_byte) { |
| local_event_status |= ACPI_EVENT_FLAG_STATUS_SET; |
| } |
| |
| (*event_status) = local_event_status; |
| return_ACPI_STATUS(AE_OK); |
| } |
| |
| ACPI_EXPORT_SYMBOL(acpi_get_event_status) |
| #endif /* !ACPI_REDUCED_HARDWARE */ |