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

• Lines: 186
• Date: Wed Jun 20 17:47:40 2001
• Orig file: v2.4.5/linux/drivers/acpi/ospm/ec/ecspace.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/drivers/acpi/ospm/ec/ecspace.c linux/drivers/acpi/ospm/ec/ecspace.c
@@ -0,0 +1,185 @@
+/*****************************************************************************
+ *
+ * Module Name: ecspace.c
+ *   $Revision: 20 $
+ *
+ *****************************************************************************/
+
+/*
+ *  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		("ecspace")
+
+
+/****************************************************************************
+ *
+ * FUNCTION:    ec_space_setup
+ *
+ * PARAMETERS:
+ *
+ * RETURN:
+ *
+ * DESCRIPTION:
+ *
+ ****************************************************************************/
+
+ACPI_STATUS
+ec_space_setup (
+	ACPI_HANDLE		region_handle,
+	u32			function,
+	void			*handler_context,
+	void			**return_context)
+{
+	/*
+	 * The EC object is in the handler context and is needed
+	 * when calling the ec_space_handler.
+	 */
+	*return_context = handler_context;
+
+	return AE_OK;
+}
+
+
+/****************************************************************************
+ *
+ * FUNCTION:    ec_space_handler
+ *
+ * PARAMETERS:  function            - Read or Write operation
+ *              address             - Where in the space to read or write
+ *              bit_width           - Field width in bits (8, 16, or 32)
+ *              value               - Pointer to in or out value
+ *              context             - context pointer
+ *
+ * RETURN:
+ *
+ * DESCRIPTION: Handler for the Embedded Controller (EC) address space
+ *              (Op Region)
+ *
+ ****************************************************************************/
+
+ACPI_STATUS
+ec_space_handler (
+	u32                     function,
+	ACPI_PHYSICAL_ADDRESS   address,
+	u32                     bit_width,
+	u32                     *value,
+	void                    *handler_context,
+	void                    *region_context)
+{
+	ACPI_STATUS             status = AE_OK;
+	EC_CONTEXT              *ec = NULL;
+	EC_REQUEST              ec_request;
+
+	if (address > 0xFF || bit_width != 8 || !value || !handler_context) {
+		return(AE_BAD_PARAMETER);
+	}
+
+	ec = (EC_CONTEXT*)handler_context;
+
+	switch (function) {
+
+	case ACPI_READ_ADR_SPACE:
+		ec_request.command = EC_COMMAND_READ;
+		ec_request.address = address;
+		ec_request.data = 0;
+		break;
+
+	case ACPI_WRITE_ADR_SPACE:
+		ec_request.command = EC_COMMAND_WRITE;
+		ec_request.address = address;
+		ec_request.data = (u8)(*value);
+		break;
+
+	default:
+		return(AE_BAD_PARAMETER);
+		break;
+	}
+
+	/*
+	 * Perform the Transaction.
+	 */
+	status = ec_transaction(ec, &ec_request);
+	if (ACPI_SUCCESS(status)) {
+		(*value) = (u32)ec_request.data;
+	}
+
+	return(status);
+}
+
+
+/****************************************************************************
+ *
+ * FUNCTION:    ec_install_space_handler
+ *
+ * PARAMETERS:
+ *
+ * RETURN:
+ *
+ * DESCRIPTION:
+ *
+ ****************************************************************************/
+
+ACPI_STATUS
+ec_install_space_handler (
+	EC_CONTEXT              *ec)
+{
+	ACPI_STATUS             status = AE_OK;
+
+	if (!ec) {
+		return(AE_BAD_PARAMETER);
+	}
+
+	status = acpi_install_address_space_handler (ec->acpi_handle,
+		ACPI_ADR_SPACE_EC, &ec_space_handler, &ec_space_setup, ec);
+	
+	return(status);
+}
+
+
+/****************************************************************************
+ *
+ * FUNCTION:    ec_remove_space_handler
+ *
+ * PARAMETERS:
+ *
+ * RETURN:
+ *
+ * DESCRIPTION:
+ *
+ ****************************************************************************/
+
+ACPI_STATUS
+ec_remove_space_handler (
+	EC_CONTEXT              *ec)
+{
+	ACPI_STATUS             status = AE_OK;
+
+	if (!ec) {
+		return(AE_BAD_PARAMETER);
+	}
+
+	status = acpi_remove_address_space_handler(ec->acpi_handle,
+		ACPI_ADR_SPACE_EC, &ec_space_handler);
+
+	return(status);
+}