2 * acpi_container.c - ACPI Generic Container Driver
5 * Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com)
6 * Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com)
7 * Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com)
8 * Copyright (C) 2004 Intel Corp.
9 * Copyright (C) 2004 FUJITSU LIMITED
11 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or (at
16 * your option) any later version.
18 * This program is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
23 * You should have received a copy of the GNU General Public License along
24 * with this program; if not, write to the Free Software Foundation, Inc.,
25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
27 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
29 #include <linux/kernel.h>
30 #include <linux/module.h>
31 #include <linux/init.h>
32 #include <linux/types.h>
33 #include <linux/acpi.h>
34 #include <acpi/acpi_bus.h>
35 #include <acpi/acpi_drivers.h>
36 #include <acpi/container.h>
38 #define ACPI_CONTAINER_DEVICE_NAME "ACPI container device"
39 #define ACPI_CONTAINER_CLASS "container"
41 #define INSTALL_NOTIFY_HANDLER 1
42 #define UNINSTALL_NOTIFY_HANDLER 2
44 #define ACPI_CONTAINER_COMPONENT 0x01000000
45 #define _COMPONENT ACPI_CONTAINER_COMPONENT
46 ACPI_MODULE_NAME("container");
48 MODULE_AUTHOR("Anil S Keshavamurthy");
49 MODULE_DESCRIPTION("ACPI container driver");
50 MODULE_LICENSE("GPL");
52 static int acpi_container_add(struct acpi_device *device);
53 static int acpi_container_remove(struct acpi_device *device, int type);
55 static const struct acpi_device_id container_device_ids[] = {
61 MODULE_DEVICE_TABLE(acpi, container_device_ids);
63 static struct acpi_driver acpi_container_driver = {
65 .class = ACPI_CONTAINER_CLASS,
66 .ids = container_device_ids,
68 .add = acpi_container_add,
69 .remove = acpi_container_remove,
73 /*******************************************************************/
75 static int is_device_present(acpi_handle handle)
82 status = acpi_get_handle(handle, "_STA", &temp);
83 if (ACPI_FAILURE(status))
84 return 1; /* _STA not found, assume device present */
86 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
87 if (ACPI_FAILURE(status))
88 return 0; /* Firmware error */
90 return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
93 /*******************************************************************/
94 static int acpi_container_add(struct acpi_device *device)
96 struct acpi_container *container;
100 printk(KERN_ERR PREFIX "device is NULL\n");
104 container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
108 container->handle = device->handle;
109 strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
110 strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
111 acpi_driver_data(device) = container;
113 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
114 acpi_device_name(device), acpi_device_bid(device)));
119 static int acpi_container_remove(struct acpi_device *device, int type)
121 acpi_status status = AE_OK;
122 struct acpi_container *pc = NULL;
124 pc = acpi_driver_data(device);
129 static int container_device_add(struct acpi_device **device, acpi_handle handle)
132 struct acpi_device *pdev;
136 if (acpi_get_parent(handle, &phandle)) {
140 if (acpi_bus_get_device(phandle, &pdev)) {
144 if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
148 result = acpi_bus_start(*device);
153 static void container_notify_cb(acpi_handle handle, u32 type, void *context)
155 struct acpi_device *device = NULL;
161 present = is_device_present(handle);
164 case ACPI_NOTIFY_BUS_CHECK:
166 case ACPI_NOTIFY_DEVICE_CHECK:
167 printk("Container driver received %s event\n",
168 (type == ACPI_NOTIFY_BUS_CHECK) ?
169 "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
170 status = acpi_bus_get_device(handle, &device);
172 if (ACPI_FAILURE(status) || !device) {
173 result = container_device_add(&device, handle);
175 kobject_uevent(&device->dev.kobj,
178 printk("Failed to add container\n");
181 if (ACPI_SUCCESS(status)) {
182 /* device exist and this is a remove request */
183 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
187 case ACPI_NOTIFY_EJECT_REQUEST:
188 if (!acpi_bus_get_device(handle, &device) && device) {
189 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
199 container_walk_namespace_cb(acpi_handle handle,
200 u32 lvl, void *context, void **rv)
203 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
204 struct acpi_device_info *info;
206 int *action = context;
209 status = acpi_get_object_info(handle, &buffer);
210 if (ACPI_FAILURE(status) || !buffer.pointer) {
214 info = buffer.pointer;
215 if (info->valid & ACPI_VALID_HID)
216 hid = info->hardware_id.value;
222 if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
223 strcmp(hid, "PNP0A06")) {
228 case INSTALL_NOTIFY_HANDLER:
229 acpi_install_notify_handler(handle,
231 container_notify_cb, NULL);
233 case UNINSTALL_NOTIFY_HANDLER:
234 acpi_remove_notify_handler(handle,
236 container_notify_cb);
243 kfree(buffer.pointer);
248 static int __init acpi_container_init(void)
251 int action = INSTALL_NOTIFY_HANDLER;
253 result = acpi_bus_register_driver(&acpi_container_driver);
258 /* register notify handler to every container device */
259 acpi_walk_namespace(ACPI_TYPE_DEVICE,
262 container_walk_namespace_cb, &action, NULL);
267 static void __exit acpi_container_exit(void)
269 int action = UNINSTALL_NOTIFY_HANDLER;
272 acpi_walk_namespace(ACPI_TYPE_DEVICE,
275 container_walk_namespace_cb, &action, NULL);
277 acpi_bus_unregister_driver(&acpi_container_driver);
282 module_init(acpi_container_init);
283 module_exit(acpi_container_exit);