patch-2.4.0-test3 linux/drivers/acpi/events/evxfregn.c

• Lines: 390
• Date: Wed Jul 5 11:23:12 2000
• Orig file: v2.4.0-test2/linux/drivers/acpi/events/evxfregn.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test2/linux/drivers/acpi/events/evxfregn.c linux/drivers/acpi/events/evxfregn.c
@@ -0,0 +1,389 @@
+/******************************************************************************
+ *
+ * Module Name: evxfregn - External Interfaces, ACPI Operation Regions and
+ *                         Address Spaces.
+ *
+ *****************************************************************************/
+
+/*
+ *  Copyright (C) 2000 R. Byron Moore
+ *
+ *  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 "hardware.h"
+#include "namesp.h"
+#include "events.h"
+#include "amlcode.h"
+#include "interp.h"
+
+#define _COMPONENT          EVENT_HANDLING
+	 MODULE_NAME         ("evxfregn");
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_install_address_space_handler
+ *
+ * PARAMETERS:  Device          - Handle for the device
+ *              Space_id        - The address space ID
+ *              Handler         - Address of the handler
+ *              Context         - Value passed to the handler on each access
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Install a handler for accesses on an address space controlled
+ *              a specific device.
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+acpi_install_address_space_handler (
+	ACPI_HANDLE             device,
+	ACPI_ADDRESS_SPACE_TYPE space_id,
+	ADDRESS_SPACE_HANDLER   handler,
+	ADDRESS_SPACE_SETUP     setup,
+	void                    *context)
+{
+	ACPI_OBJECT_INTERNAL    *obj_desc;
+	ACPI_OBJECT_INTERNAL    *handler_obj;
+	ACPI_NAMED_OBJECT       *obj_entry;
+	ACPI_STATUS             status = AE_OK;
+	OBJECT_TYPE_INTERNAL    type;
+	u16                     flags = 0;
+
+
+	/* Parameter validation */
+
+	if ((!device)   ||
+		((!handler)  && (handler != ACPI_DEFAULT_HANDLER)) ||
+		(space_id > ACPI_MAX_ADDRESS_SPACE))
+	{
+		return (AE_BAD_PARAMETER);
+	}
+
+	acpi_cm_acquire_mutex (ACPI_MTX_NAMESPACE);
+
+	/* Convert and validate the device handle */
+
+	obj_entry = acpi_ns_convert_handle_to_entry (device);
+	if (!obj_entry) {
+		status = AE_BAD_PARAMETER;
+		goto unlock_and_exit;
+	}
+
+	/*
+	 *  This registration is valid for only the types below
+	 *  and the root.  This is where the default handlers
+	 *  get placed.
+	 */
+
+	if ((obj_entry->type != ACPI_TYPE_DEVICE)    &&
+		(obj_entry->type != ACPI_TYPE_PROCESSOR) &&
+		(obj_entry->type != ACPI_TYPE_THERMAL)   &&
+		(obj_entry != acpi_gbl_root_object))
+	{
+		status = AE_BAD_PARAMETER;
+		goto unlock_and_exit;
+	}
+
+	if (handler == ACPI_DEFAULT_HANDLER) {
+		flags = ADDR_HANDLER_DEFAULT_INSTALLED;
+
+		switch (space_id)
+		{
+		case ADDRESS_SPACE_SYSTEM_MEMORY:
+			handler = acpi_aml_system_memory_space_handler;
+			setup = acpi_ev_system_memory_region_setup;
+			break;
+
+		case ADDRESS_SPACE_SYSTEM_IO:
+			handler = acpi_aml_system_io_space_handler;
+			setup = acpi_ev_io_space_region_setup;
+			break;
+
+		case ADDRESS_SPACE_PCI_CONFIG:
+			handler = acpi_aml_pci_config_space_handler;
+			setup = acpi_ev_pci_config_region_setup;
+			break;
+
+		default:
+			status = AE_NOT_EXIST;
+			goto unlock_and_exit;
+			break;
+		}
+	}
+
+	/*
+	 *  If the caller hasn't specified a setup routine, use the default
+	 */
+	if (!setup) {
+		setup = acpi_ev_default_region_setup;
+	}
+
+	/*
+	 *  Check for an existing internal object
+	 */
+
+	obj_desc = acpi_ns_get_attached_object ((ACPI_HANDLE) obj_entry);
+	if (obj_desc) {
+		/*
+		 *  The object exists.
+		 *  Make sure the handler is not already installed.
+		 */
+
+		/* check the address handler the user requested */
+
+		handler_obj = obj_desc->device.addr_handler;
+		while (handler_obj) {
+			/*
+			 *  We have an Address handler, see if user requested this
+			 *  address space.
+			 */
+			if(handler_obj->addr_handler.space_id == space_id) {
+				status = AE_EXIST;
+				goto unlock_and_exit;
+			}
+
+			/*
+			 *  Move through the linked list of handlers
+			 */
+			handler_obj = handler_obj->addr_handler.link;
+		}
+	}
+
+	else {
+		/* Obj_desc does not exist, create one */
+
+		if (obj_entry->type == ACPI_TYPE_ANY) {
+			type = ACPI_TYPE_DEVICE;
+		}
+
+		else {
+			type = obj_entry->type;
+		}
+
+		obj_desc = acpi_cm_create_internal_object (type);
+		if (!obj_desc) {
+			status = AE_NO_MEMORY;
+			goto unlock_and_exit;
+		}
+
+		/* Init new descriptor */
+
+		obj_desc->common.type = (u8) type;
+
+		/* Attach the new object to the NTE */
+
+		status = acpi_ns_attach_object (device, obj_desc, (u8) type);
+		if (ACPI_FAILURE (status)) {
+			acpi_cm_remove_reference (obj_desc);
+			goto unlock_and_exit;
+		}
+
+		/* TBD: [Investigate] Will this always be of type DEVICE? */
+
+		if (type == ACPI_TYPE_DEVICE) {
+			obj_desc->device.handle = device;
+		}
+	}
+
+	/*
+	 *  Now we can install the handler
+	 *
+	 *  At this point we know that there is no existing handler.
+	 *  So, we just allocate the object for the handler and link it
+	 *  into the list.
+	 */
+	handler_obj = acpi_cm_create_internal_object (INTERNAL_TYPE_ADDRESS_HANDLER);
+	if (!handler_obj) {
+		status = AE_NO_MEMORY;
+		goto unlock_and_exit;
+	}
+
+	handler_obj->addr_handler.space_id  = (u16) space_id;
+	handler_obj->addr_handler.hflags    = flags;
+	handler_obj->addr_handler.link      = obj_desc->device.addr_handler;
+	handler_obj->addr_handler.region_list = NULL;
+	handler_obj->addr_handler.nte       = obj_entry;
+	handler_obj->addr_handler.handler   = handler;
+	handler_obj->addr_handler.context   = context;
+	handler_obj->addr_handler.setup     = setup;
+
+	/*
+	 *  Now walk the namespace finding all of the regions this
+	 *  handler will manage.
+	 *
+	 *  We start at the device and search the branch toward
+	 *  the leaf nodes until either the leaf is encountered or
+	 *  a device is detected that has an address handler of the
+	 *  same type.
+	 *
+	 *  In either case we back up and search down the remainder
+	 *  of the branch
+	 */
+	status = acpi_ns_walk_namespace (ACPI_TYPE_ANY, device,
+			 ACPI_INT32_MAX, NS_WALK_NO_UNLOCK,
+			 acpi_ev_addr_handler_helper,
+			 handler_obj, NULL);
+
+	/*
+	 *  Place this handler 1st on the list
+	 */
+
+	handler_obj->common.reference_count =
+			 (u16) (handler_obj->common.reference_count +
+			 obj_desc->common.reference_count - 1);
+	obj_desc->device.addr_handler = handler_obj;
+
+
+unlock_and_exit:
+	acpi_cm_release_mutex (ACPI_MTX_NAMESPACE);
+	return (status);
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    Acpi_remove_address_space_handler
+ *
+ * PARAMETERS:  Space_id        - The address space ID
+ *              Handler         - Address of the handler
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Install a handler for accesses on an Operation Region
+ *
+ ******************************************************************************/
+
+ACPI_STATUS
+acpi_remove_address_space_handler (
+	ACPI_HANDLE             device,
+	ACPI_ADDRESS_SPACE_TYPE space_id,
+	ADDRESS_SPACE_HANDLER   handler)
+{
+	ACPI_OBJECT_INTERNAL    *obj_desc;
+	ACPI_OBJECT_INTERNAL    *handler_obj;
+	ACPI_OBJECT_INTERNAL    *region_obj;
+	ACPI_OBJECT_INTERNAL    **last_obj_ptr;
+	ACPI_NAMED_OBJECT       *obj_entry;
+	ACPI_STATUS             status = AE_OK;
+
+
+	/* Parameter validation */
+
+	if ((!device)   ||
+		((!handler)  && (handler != ACPI_DEFAULT_HANDLER)) ||
+		(space_id > ACPI_MAX_ADDRESS_SPACE))
+	{
+		return (AE_BAD_PARAMETER);
+	}
+
+	acpi_cm_acquire_mutex (ACPI_MTX_NAMESPACE);
+
+	/* Convert and validate the device handle */
+
+	obj_entry = acpi_ns_convert_handle_to_entry (device);
+	if (!obj_entry) {
+		status = AE_BAD_PARAMETER;
+		goto unlock_and_exit;
+	}
+
+
+	/* Make sure the internal object exists */
+
+	obj_desc = acpi_ns_get_attached_object ((ACPI_HANDLE) obj_entry);
+	if (!obj_desc) {
+		/*
+		 *  The object DNE.
+		 */
+		status = AE_NOT_EXIST;
+		goto unlock_and_exit;
+	}
+
+	/*
+	 *  find the address handler the user requested
+	 */
+
+	handler_obj = obj_desc->device.addr_handler;
+	last_obj_ptr = &obj_desc->device.addr_handler;
+	while (handler_obj) {
+		/*
+		 *  We have a handler, see if user requested this one
+		 */
+
+		if(handler_obj->addr_handler.space_id == space_id) {
+			/*
+			 *  Got it, first dereference this in the Regions
+			 */
+			region_obj = handler_obj->addr_handler.region_list;
+
+			/* Walk the handler's region list */
+
+			while (region_obj) {
+				/*
+				 *  First disassociate the handler from the region.
+				 *
+				 *  NOTE: this doesn't mean that the region goes away
+				 *  The region is just inaccessible as indicated to
+				 *  the _REG method
+				 */
+				acpi_ev_disassociate_region_from_handler(region_obj);
+
+				/*
+				 *  Walk the list, since we took the first region and it
+				 *  was removed from the list by the dissassociate call
+				 *  we just get the first item on the list again
+				 */
+				region_obj = handler_obj->addr_handler.region_list;
+
+			}
+
+			/*
+			 *  Remove this Handler object from the list
+			 */
+			*last_obj_ptr = handler_obj->addr_handler.link;
+
+			/*
+			 *  Now we can delete the handler object
+			 */
+			acpi_cm_remove_reference (handler_obj);
+			acpi_cm_remove_reference (handler_obj);
+
+			goto unlock_and_exit;
+		}
+
+		/*
+		 *  Move through the linked list of handlers
+		 */
+		last_obj_ptr = &handler_obj->addr_handler.link;
+		handler_obj = handler_obj->addr_handler.link;
+	}
+
+
+	/*
+	 *  The handler does not exist
+	 */
+	status = AE_NOT_EXIST;
+
+
+unlock_and_exit:
+	acpi_cm_release_mutex (ACPI_MTX_NAMESPACE);
+	return (status);
+}
+
+