/* * acpi_container.c  - ACPI Generic Container Driver * ($Revision: ) * * Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com) * Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com) * Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com) * Copyright (C) 2004 Intel Corp. * Copyright (C) 2004 FUJITSU LIMITED * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * *  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 <linux/kernel.h>#include <linux/module.h>#include <linux/init.h>#include <linux/types.h>#include <linux/acpi.h>#include <acpi/acpi_bus.h>#include <acpi/acpi_drivers.h>#include <acpi/container.h> #define ACPI_CONTAINER_DEVICE_NAME	"ACPI container device"#define ACPI_CONTAINER_CLASS		"container" #define INSTALL_NOTIFY_HANDLER		1#define UNINSTALL_NOTIFY_HANDLER	2 #define ACPI_CONTAINER_COMPONENT	0x01000000#define _COMPONENT			ACPI_CONTAINER_COMPONENTACPI_MODULE_NAME("container"); MODULE_AUTHOR("Anil S Keshavamurthy");MODULE_DESCRIPTION("ACPI container driver");MODULE_LICENSE("GPL"); #define ACPI_STA_PRESENT		(0x00000001) static int acpi_container_add(struct acpi_device *device);static int acpi_container_remove(struct acpi_device *device, int type); static struct acpi_driver acpi_container_driver = {	.name = "container",	.class = ACPI_CONTAINER_CLASS,	.ids = "ACPI0004,PNP0A05,PNP0A06",	.ops = {		.add = acpi_container_add,		.remove = acpi_container_remove,		},}; /*******************************************************************/ static int is_device_present(acpi_handle handle){	acpi_handle temp;	acpi_status status;	unsigned long sta;  	status = acpi_get_handle(handle, "_STA", &temp);	if (ACPI_FAILURE(status))		return 1;	/* _STA not found, assmue device present */ 	status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);	if (ACPI_FAILURE(status))		return 0;	/* Firmware error */ 	return ((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT);} /*******************************************************************/static int acpi_container_add(struct acpi_device *device){	struct acpi_container *container;  	if (!device) {		printk(KERN_ERR PREFIX "device is NULL\n");		return -EINVAL;	} 	container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);	if (!container)		return -ENOMEM; 	container->handle = device->handle;	strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);	strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);	acpi_driver_data(device) = container; 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",			  acpi_device_name(device), acpi_device_bid(device))); 	return 0;} static int acpi_container_remove(struct acpi_device *device, int type){	acpi_status status = AE_OK;	struct acpi_container *pc = NULL; 	pc = acpi_driver_data(device);	kfree(pc);	return status;} static int container_device_add(struct acpi_device **device, acpi_handle handle){	acpi_handle phandle;	struct acpi_device *pdev;	int result;  	if (acpi_get_parent(handle, &phandle)) {		return -ENODEV;	} 	if (acpi_bus_get_device(phandle, &pdev)) {		return -ENODEV;	} 	if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {		return -ENODEV;	} 	result = acpi_bus_start(*device); 	return result;} static void container_notify_cb(acpi_handle handle, u32 type, void *context){	struct acpi_device *device = NULL;	int result;	int present;	acpi_status status;  	present = is_device_present(handle); 	switch (type) {	case ACPI_NOTIFY_BUS_CHECK:		/* Fall through */	case ACPI_NOTIFY_DEVICE_CHECK:		printk("Container driver received %s event\n",		       (type == ACPI_NOTIFY_BUS_CHECK) ?		       "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");		status = acpi_bus_get_device(handle, &device);		if (present) {			if (ACPI_FAILURE(status) || !device) {				result = container_device_add(&device, handle);				if (!result)					kobject_uevent(&device->dev.kobj,						       KOBJ_ONLINE);				else					printk("Failed to add container\n");			}		} else {			if (ACPI_SUCCESS(status)) {				/* device exist and this is a remove request */				kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);			}		}		break;	case ACPI_NOTIFY_EJECT_REQUEST:		if (!acpi_bus_get_device(handle, &device) && device) {			kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);		}		break;	default:		break;	}	return;} static acpi_statuscontainer_walk_namespace_cb(acpi_handle handle,			    u32 lvl, void *context, void **rv){	char *hid = NULL;	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };	struct acpi_device_info *info;	acpi_status status;	int *action = context;  	status = acpi_get_object_info(handle, &buffer);	if (ACPI_FAILURE(status) || !buffer.pointer) {		return AE_OK;	} 	info = buffer.pointer;	if (info->valid & ACPI_VALID_HID)		hid = info->hardware_id.value; 	if (hid == NULL) {		goto end;	} 	if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&	    strcmp(hid, "PNP0A06")) {		goto end;	} 	switch (*action) {	case INSTALL_NOTIFY_HANDLER:		acpi_install_notify_handler(handle,					    ACPI_SYSTEM_NOTIFY,					    container_notify_cb, NULL);		break;	case UNINSTALL_NOTIFY_HANDLER:		acpi_remove_notify_handler(handle,					   ACPI_SYSTEM_NOTIFY,					   container_notify_cb);		break;	default:		break;	}       end:	kfree(buffer.pointer); 	return AE_OK;} static int __init acpi_container_init(void){	int result = 0;	int action = INSTALL_NOTIFY_HANDLER; 	result = acpi_bus_register_driver(&acpi_container_driver);	if (result < 0) {		return (result);	} 	/* register notify handler to every container device */	acpi_walk_namespace(ACPI_TYPE_DEVICE,			    ACPI_ROOT_OBJECT,			    ACPI_UINT32_MAX,			    container_walk_namespace_cb, &action, NULL); 	return (0);} static void __exit acpi_container_exit(void){	int action = UNINSTALL_NOTIFY_HANDLER;  	acpi_walk_namespace(ACPI_TYPE_DEVICE,			    ACPI_ROOT_OBJECT,			    ACPI_UINT32_MAX,			    container_walk_namespace_cb, &action, NULL); 	acpi_bus_unregister_driver(&acpi_container_driver); 	return;} module_init(acpi_container_init);module_exit(acpi_container_exit);