patch-2.4.6 linux/drivers/acpi/ospm/ec/ecspace.c
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- 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);
+}
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