ecgpe.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:6k
- /*****************************************************************************
- *
- * Module Name: ecgpe.c
- * $Revision: 28 $
- *
- *****************************************************************************/
- /*
- * Copyright (C) 2000, 2001 Andrew Grover
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include <acpi.h>
- #include "ec.h"
- #define _COMPONENT ACPI_EC
- MODULE_NAME ("ecgpe")
- /****************************************************************************
- *
- * FUNCTION: ec_query_handler
- *
- * PARAMETERS:
- *
- * RETURN:
- *
- * DESCRIPTION:
- *
- ****************************************************************************/
- void
- ec_query_handler (
- void *context)
- {
- EC_CONTEXT *ec = (EC_CONTEXT*)context;
- static char object_name[5] = {'_','Q','0','0',' '};
- const char hex[] = {'0','1','2','3','4','5','6','7','8',
- '9','A','B','C','D','E','F'};
- FUNCTION_TRACE("ec_query_handler");
- if (!ec) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid (NULL) context.n"));
- return_VOID;
- }
- /*
- * Evaluate _Qxx:
- * --------------
- * Evaluate corresponding _Qxx method. Note that a zero query value
- * indicates a spurious EC_SCI (no such thing as _Q00).
- */
- object_name[2] = hex[((ec->query_data >> 4) & 0x0F)];
- object_name[3] = hex[(ec->query_data & 0x0F)];
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Evaluating [%s] for ec [%02x].n", object_name, ec->device_handle));
- bm_evaluate_object(ec->acpi_handle, object_name, NULL, NULL);
- return_VOID;
- }
- /****************************************************************************
- *
- * FUNCTION: ec_gpe_handler
- *
- * PARAMETERS:
- *
- * RETURN:
- *
- * DESCRIPTION:
- *
- ****************************************************************************/
- void
- ec_gpe_handler (
- void *context)
- {
- acpi_status status = AE_OK;
- EC_CONTEXT *ec = (EC_CONTEXT*)context;
- EC_STATUS ec_status = 0;
- FUNCTION_TRACE("ec_gpe_handler");
- if (!ec) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Invalid (NULL) context.n"));
- return_VOID;
- }
- /* TBD: synchronize w/ transaction (ectransx). */
- /*
- * EC_SCI?
- * -------
- * Check the EC_SCI bit to see if this is an EC_SCI event. If not (e.g.
- * OBF/IBE) just return, as we already poll to detect these events.
- */
- acpi_os_read_port(ec->status_port, &ec_status, 8);
- if (!(ec_status & EC_FLAG_SCI)) {
- return_VOID;
- }
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "EC_SCI event detected on ec [%02x] - running query.n", ec->device_handle));
- /*
- * Run Query:
- * ----------
- * Query the EC to find out which _Qxx method we need to evaluate.
- * Note that successful completion of the query causes the EC_SCI
- * bit to be cleared (and thus clearing the interrupt source).
- */
- status = ec_io_write(ec, ec->command_port, EC_COMMAND_QUERY,
- EC_EVENT_OUTPUT_BUFFER_FULL);
- if (ACPI_FAILURE(status)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "Unable to send 'query command' to EC.n"));
- return_VOID;
- }
- status = ec_io_read(ec, ec->data_port, &(ec->query_data),
- EC_EVENT_NONE);
- if (ACPI_FAILURE(status)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "Error reading query data.n"));
- return_VOID;
- }
- /* TBD: un-synchronize w/ transaction (ectransx). */
- /*
- * Spurious EC_SCI?
- * ----------------
- */
- if (!ec->query_data) {
- ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Spurious EC SCI detected.n"));
- return_VOID;
- }
- /*
- * Defer _Qxx Execution:
- * ---------------------
- * Can't evaluate this method now 'cause we're at interrupt-level.
- */
- status = acpi_os_queue_for_execution(OSD_PRIORITY_GPE,
- ec_query_handler, ec);
- if (ACPI_FAILURE(status)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "Unable to defer _Qxx method evaluation.n"));
- return_VOID;
- }
- return_VOID;
- }
- /****************************************************************************
- *
- * FUNCTION: ec_install_gpe_handler
- *
- * PARAMETERS:
- *
- * RETURN:
- *
- * DESCRIPTION:
- *
- ****************************************************************************/
- acpi_status
- ec_install_gpe_handler (
- EC_CONTEXT *ec)
- {
- acpi_status status = AE_OK;
- FUNCTION_TRACE("ec_install_gpe_handler");
- if (!ec) {
- return_ACPI_STATUS(AE_BAD_PARAMETER);
- }
- /*
- * Evaluate _GPE:
- * --------------
- * Evaluate the "_GPE" object (required) to find out which GPE bit
- * is used by this EC to signal events (SCIs).
- */
- status = bm_evaluate_simple_integer(ec->acpi_handle,
- "_GPE", &(ec->gpe_bit));
- if (ACPI_FAILURE(status)) {
- return_ACPI_STATUS(status);
- }
- /*
- * Install GPE Handler:
- * --------------------
- * Install a handler for this EC's GPE bit.
- */
- status = acpi_install_gpe_handler(ec->gpe_bit, ACPI_EVENT_EDGE_TRIGGERED,
- &ec_gpe_handler, ec);
- if (ACPI_FAILURE(status)) {
- ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "acpi_install_gpe_handler() failed for GPE bit [%02x] with status [%08x].n", ec->gpe_bit, status));
- ec->gpe_bit = EC_GPE_UNKNOWN;
- return_ACPI_STATUS(status);
- }
- return_ACPI_STATUS(status);
- }
- /****************************************************************************
- *
- * FUNCTION: ec_remove_gpe_handler
- *
- * PARAMETERS:
- *
- * RETURN:
- *
- * DESCRIPTION:
- *
- ****************************************************************************/
- acpi_status
- ec_remove_gpe_handler (
- EC_CONTEXT *ec)
- {
- acpi_status status = AE_OK;
- FUNCTION_TRACE("ec_remove_gpe_handler");
- if (!ec) {
- return_ACPI_STATUS(AE_BAD_PARAMETER);
- }
- status = acpi_remove_gpe_handler(ec->gpe_bit, &ec_gpe_handler);
- return_ACPI_STATUS(status);
- }