patch-2.4.6 linux/drivers/acpi/ospm/ec/ecgpe.c

• Lines: 231
• Date: Wed Jun 20 17:47:40 2001
• Orig file: v2.4.5/linux/drivers/acpi/ospm/ec/ecgpe.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/drivers/acpi/ospm/ec/ecgpe.c linux/drivers/acpi/ospm/ec/ecgpe.c
@@ -0,0 +1,230 @@
+/*****************************************************************************
+ *
+ * Module Name: ecgpe.c
+ *   $Revision: 26 $
+ *
+ *****************************************************************************/
+
+/*
+ *  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','\0'};
+	const char		hex[] = {'0','1','2','3','4','5','6','7','8',
+					'9','A','B','C','D','E','F'};
+
+	if (!ec) {
+		return;
+	}
+
+	/*
+	 * 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)];
+
+	bm_evaluate_object(ec->acpi_handle, object_name, NULL, NULL);
+
+	return;
+}
+
+
+/****************************************************************************
+ *
+ * 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;
+
+	if (!ec) {
+		return;
+	}
+
+	/* 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.
+	 */
+	ec_status = acpi_os_in8(ec->status_port);
+	if (!(ec_status & EC_FLAG_SCI)) {
+		return;
+	}
+
+	/*
+	 * 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)) {
+		return;
+	}
+
+	status = ec_io_read(ec, ec->data_port, &(ec->query_data),
+		EC_EVENT_NONE);
+	if (ACPI_FAILURE(status)) {
+		return;
+	}
+
+	/* TBD: un-synchronize w/ transaction (ectransx). */
+
+	/*
+	 * Spurious EC_SCI?
+	 * ----------------
+	 */
+	if (!ec->query_data) {
+		return;
+	}
+
+	/*
+	 * 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)) {
+		return;
+	}
+
+	return;
+}
+
+
+/****************************************************************************
+ *
+ * FUNCTION:    ec_install_gpe_handler
+ *
+ * PARAMETERS:
+ *
+ * RETURN:
+ *
+ * DESCRIPTION:
+ *
+ ****************************************************************************/
+
+ACPI_STATUS
+ec_install_gpe_handler (
+	EC_CONTEXT              *ec)
+{
+	ACPI_STATUS             status = AE_OK;
+
+	if (!ec) {
+		return(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(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)) {
+		ec->gpe_bit = EC_GPE_UNKNOWN;
+		return(status);
+	}
+
+	return(status);
+}
+
+
+/****************************************************************************
+ *
+ * FUNCTION:    ec_remove_gpe_handler
+ *
+ * PARAMETERS:
+ *
+ * RETURN:
+ *
+ * DESCRIPTION:
+ *
+ ****************************************************************************/
+
+ACPI_STATUS
+ec_remove_gpe_handler (
+	EC_CONTEXT              *ec)
+{
+	ACPI_STATUS             status = AE_OK;
+
+	if (!ec) {
+		return(AE_BAD_PARAMETER);
+	}
+
+	status = acpi_remove_gpe_handler(ec->gpe_bit, &ec_gpe_handler);
+
+	return(status);
+}