ACPICA: Major update for acpi_get_object_info external interface
[linux-2.6.git] / drivers / acpi / container.c
1 /*
2  * acpi_container.c  - ACPI Generic Container Driver
3  * ($Revision: )
4  *
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
10  *
11  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
12  *
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.
17  *
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.
22  *
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.
26  *
27  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
28  */
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>
37
38 #define ACPI_CONTAINER_DEVICE_NAME      "ACPI container device"
39 #define ACPI_CONTAINER_CLASS            "container"
40
41 #define INSTALL_NOTIFY_HANDLER          1
42 #define UNINSTALL_NOTIFY_HANDLER        2
43
44 #define _COMPONENT                      ACPI_CONTAINER_COMPONENT
45 ACPI_MODULE_NAME("container");
46
47 MODULE_AUTHOR("Anil S Keshavamurthy");
48 MODULE_DESCRIPTION("ACPI container driver");
49 MODULE_LICENSE("GPL");
50
51 static int acpi_container_add(struct acpi_device *device);
52 static int acpi_container_remove(struct acpi_device *device, int type);
53
54 static const struct acpi_device_id container_device_ids[] = {
55         {"ACPI0004", 0},
56         {"PNP0A05", 0},
57         {"PNP0A06", 0},
58         {"", 0},
59 };
60 MODULE_DEVICE_TABLE(acpi, container_device_ids);
61
62 static struct acpi_driver acpi_container_driver = {
63         .name = "container",
64         .class = ACPI_CONTAINER_CLASS,
65         .ids = container_device_ids,
66         .ops = {
67                 .add = acpi_container_add,
68                 .remove = acpi_container_remove,
69                 },
70 };
71
72 /*******************************************************************/
73
74 static int is_device_present(acpi_handle handle)
75 {
76         acpi_handle temp;
77         acpi_status status;
78         unsigned long long sta;
79
80
81         status = acpi_get_handle(handle, "_STA", &temp);
82         if (ACPI_FAILURE(status))
83                 return 1;       /* _STA not found, assume device present */
84
85         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
86         if (ACPI_FAILURE(status))
87                 return 0;       /* Firmware error */
88
89         return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
90 }
91
92 /*******************************************************************/
93 static int acpi_container_add(struct acpi_device *device)
94 {
95         struct acpi_container *container;
96
97
98         if (!device) {
99                 printk(KERN_ERR PREFIX "device is NULL\n");
100                 return -EINVAL;
101         }
102
103         container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
104         if (!container)
105                 return -ENOMEM;
106
107         container->handle = device->handle;
108         strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
109         strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
110         device->driver_data = container;
111
112         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
113                           acpi_device_name(device), acpi_device_bid(device)));
114
115         return 0;
116 }
117
118 static int acpi_container_remove(struct acpi_device *device, int type)
119 {
120         acpi_status status = AE_OK;
121         struct acpi_container *pc = NULL;
122
123         pc = acpi_driver_data(device);
124         kfree(pc);
125         return status;
126 }
127
128 static int container_device_add(struct acpi_device **device, acpi_handle handle)
129 {
130         acpi_handle phandle;
131         struct acpi_device *pdev;
132         int result;
133
134
135         if (acpi_get_parent(handle, &phandle)) {
136                 return -ENODEV;
137         }
138
139         if (acpi_bus_get_device(phandle, &pdev)) {
140                 return -ENODEV;
141         }
142
143         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
144                 return -ENODEV;
145         }
146
147         result = acpi_bus_start(*device);
148
149         return result;
150 }
151
152 static void container_notify_cb(acpi_handle handle, u32 type, void *context)
153 {
154         struct acpi_device *device = NULL;
155         int result;
156         int present;
157         acpi_status status;
158
159
160         present = is_device_present(handle);
161
162         switch (type) {
163         case ACPI_NOTIFY_BUS_CHECK:
164                 /* Fall through */
165         case ACPI_NOTIFY_DEVICE_CHECK:
166                 printk(KERN_WARNING "Container driver received %s event\n",
167                        (type == ACPI_NOTIFY_BUS_CHECK) ?
168                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
169                 status = acpi_bus_get_device(handle, &device);
170                 if (present) {
171                         if (ACPI_FAILURE(status) || !device) {
172                                 result = container_device_add(&device, handle);
173                                 if (!result)
174                                         kobject_uevent(&device->dev.kobj,
175                                                        KOBJ_ONLINE);
176                                 else
177                                         printk(KERN_WARNING
178                                                "Failed to add container\n");
179                         }
180                 } else {
181                         if (ACPI_SUCCESS(status)) {
182                                 /* device exist and this is a remove request */
183                                 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
184                         }
185                 }
186                 break;
187         case ACPI_NOTIFY_EJECT_REQUEST:
188                 if (!acpi_bus_get_device(handle, &device) && device) {
189                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
190                 }
191                 break;
192         default:
193                 break;
194         }
195         return;
196 }
197
198 static acpi_status
199 container_walk_namespace_cb(acpi_handle handle,
200                             u32 lvl, void *context, void **rv)
201 {
202         char *hid = NULL;
203         struct acpi_device_info *info;
204         acpi_status status;
205         int *action = context;
206
207         status = acpi_get_object_info(handle, &info);
208         if (ACPI_FAILURE(status)) {
209                 return AE_OK;
210         }
211
212         if (info->valid & ACPI_VALID_HID)
213                 hid = info->hardware_id.string;
214
215         if (hid == NULL) {
216                 goto end;
217         }
218
219         if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
220             strcmp(hid, "PNP0A06")) {
221                 goto end;
222         }
223
224         switch (*action) {
225         case INSTALL_NOTIFY_HANDLER:
226                 acpi_install_notify_handler(handle,
227                                             ACPI_SYSTEM_NOTIFY,
228                                             container_notify_cb, NULL);
229                 break;
230         case UNINSTALL_NOTIFY_HANDLER:
231                 acpi_remove_notify_handler(handle,
232                                            ACPI_SYSTEM_NOTIFY,
233                                            container_notify_cb);
234                 break;
235         default:
236                 break;
237         }
238
239       end:
240         kfree(info);
241
242         return AE_OK;
243 }
244
245 static int __init acpi_container_init(void)
246 {
247         int result = 0;
248         int action = INSTALL_NOTIFY_HANDLER;
249
250         result = acpi_bus_register_driver(&acpi_container_driver);
251         if (result < 0) {
252                 return (result);
253         }
254
255         /* register notify handler to every container device */
256         acpi_walk_namespace(ACPI_TYPE_DEVICE,
257                             ACPI_ROOT_OBJECT,
258                             ACPI_UINT32_MAX,
259                             container_walk_namespace_cb, &action, NULL);
260
261         return (0);
262 }
263
264 static void __exit acpi_container_exit(void)
265 {
266         int action = UNINSTALL_NOTIFY_HANDLER;
267
268
269         acpi_walk_namespace(ACPI_TYPE_DEVICE,
270                             ACPI_ROOT_OBJECT,
271                             ACPI_UINT32_MAX,
272                             container_walk_namespace_cb, &action, NULL);
273
274         acpi_bus_unregister_driver(&acpi_container_driver);
275
276         return;
277 }
278
279 module_init(acpi_container_init);
280 module_exit(acpi_container_exit);