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[linux-2.6] / 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_DRIVER_NAME      "ACPI container driver"
39 #define ACPI_CONTAINER_DEVICE_NAME      "ACPI container device"
40 #define ACPI_CONTAINER_CLASS            "container"
41
42 #define INSTALL_NOTIFY_HANDLER          1
43 #define UNINSTALL_NOTIFY_HANDLER        2
44
45 #define ACPI_CONTAINER_COMPONENT        0x01000000
46 #define _COMPONENT                      ACPI_CONTAINER_COMPONENT
47 ACPI_MODULE_NAME                        ("acpi_container")
48
49 MODULE_AUTHOR("Anil S Keshavamurthy");
50 MODULE_DESCRIPTION(ACPI_CONTAINER_DRIVER_NAME);
51 MODULE_LICENSE("GPL");
52
53 #define ACPI_STA_PRESENT                (0x00000001)
54
55 static int acpi_container_add(struct acpi_device *device);
56 static int acpi_container_remove(struct acpi_device *device, int type);
57
58 static struct acpi_driver acpi_container_driver = {
59         .name =         ACPI_CONTAINER_DRIVER_NAME,
60         .class =        ACPI_CONTAINER_CLASS,
61         .ids =          "ACPI0004,PNP0A05,PNP0A06",
62         .ops =          {
63                                 .add =          acpi_container_add,
64                                 .remove =       acpi_container_remove,
65                         },
66 };
67
68
69 /*******************************************************************/
70
71 static int
72 is_device_present(acpi_handle handle)
73 {
74         acpi_handle             temp;
75         acpi_status             status;
76         unsigned long   sta;
77
78         ACPI_FUNCTION_TRACE("is_device_present");
79
80         status = acpi_get_handle(handle, "_STA", &temp);
81         if (ACPI_FAILURE(status))
82                 return_VALUE(1); /* _STA not found, assmue device present */
83
84         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
85         if (ACPI_FAILURE(status))
86                 return_VALUE(0); /* Firmware error */
87
88         return_VALUE((sta & ACPI_STA_PRESENT) == ACPI_STA_PRESENT);
89 }
90
91 /*******************************************************************/
92 static int
93 acpi_container_add(struct acpi_device *device)
94 {
95         struct acpi_container *container;
96
97         ACPI_FUNCTION_TRACE("acpi_container_add");
98
99         if (!device) {
100                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "device is NULL\n"));
101                 return_VALUE(-EINVAL);
102         }
103
104         container = kmalloc(sizeof(struct acpi_container), GFP_KERNEL);
105         if(!container)
106                 return_VALUE(-ENOMEM);
107         
108         memset(container, 0, sizeof(struct acpi_container));
109         container->handle = device->handle;
110         strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
111         strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
112         acpi_driver_data(device) = container;
113
114         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",       \
115                 acpi_device_name(device), acpi_device_bid(device)));
116
117
118         return_VALUE(0);
119 }
120
121 static int
122 acpi_container_remove(struct acpi_device *device, int type)
123 {
124         acpi_status             status = AE_OK;
125         struct acpi_container   *pc = NULL;
126         pc = (struct acpi_container*) acpi_driver_data(device);
127
128         if (pc)
129                 kfree(pc);
130
131         return status;
132 }
133
134
135 static int
136 container_device_add(struct acpi_device **device, acpi_handle handle)
137 {
138         acpi_handle phandle;
139         struct acpi_device *pdev;
140         int result;
141
142         ACPI_FUNCTION_TRACE("container_device_add");
143
144         if (acpi_get_parent(handle, &phandle)) {
145                 return_VALUE(-ENODEV);
146         }
147
148         if (acpi_bus_get_device(phandle, &pdev)) {
149                 return_VALUE(-ENODEV);
150         }
151
152         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
153                 return_VALUE(-ENODEV);
154         }
155
156         result = acpi_bus_scan(*device);
157
158         return_VALUE(result);
159 }
160
161 static void
162 container_notify_cb(acpi_handle handle, u32 type, void *context)
163 {
164         struct acpi_device              *device = NULL;
165         int result;
166         int present;
167         acpi_status status;
168
169         ACPI_FUNCTION_TRACE("container_notify_cb");
170
171         present = is_device_present(handle);
172         
173         switch (type) {
174         case ACPI_NOTIFY_BUS_CHECK:
175                 /* Fall through */
176         case ACPI_NOTIFY_DEVICE_CHECK:
177                 printk("Container driver received %s event\n",
178                         (type == ACPI_NOTIFY_BUS_CHECK)?
179                         "ACPI_NOTIFY_BUS_CHECK":"ACPI_NOTIFY_DEVICE_CHECK");
180                 status = acpi_bus_get_device(handle, &device);
181                 if (present) {
182                         if (ACPI_FAILURE(status) || !device) {
183                                 result = container_device_add(&device, handle);
184                                 if (!result)
185                                         kobject_hotplug(&device->kobj,
186                                                         KOBJ_ONLINE);
187                                 else
188                                         printk("Failed to add container\n");
189                         }
190                 } else {
191                         if (ACPI_SUCCESS(status)) {
192                                 /* device exist and this is a remove request */
193                                 kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
194                         }
195                 }
196                 break;
197         case ACPI_NOTIFY_EJECT_REQUEST:
198                 if (!acpi_bus_get_device(handle, &device) && device) {
199                         kobject_hotplug(&device->kobj, KOBJ_OFFLINE);
200                 }
201                 break;
202         default:
203                 break;
204         }
205         return_VOID;
206 }
207
208 static acpi_status
209 container_walk_namespace_cb(acpi_handle handle,
210         u32 lvl,
211         void *context,
212         void **rv)
213 {
214         char                            *hid = NULL;
215         struct acpi_buffer              buffer = {ACPI_ALLOCATE_BUFFER, NULL};
216         struct acpi_device_info         *info;
217         acpi_status                     status;
218         int                             *action = context;
219
220         ACPI_FUNCTION_TRACE("container_walk_namespace_cb");
221
222         status = acpi_get_object_info(handle, &buffer);
223         if (ACPI_FAILURE(status) || !buffer.pointer) {
224                 return_ACPI_STATUS(AE_OK);
225         }
226
227         info = buffer.pointer;
228         if (info->valid & ACPI_VALID_HID)
229                 hid = info->hardware_id.value;
230
231         if (hid == NULL) {
232                 goto end;
233         }
234
235         if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
236                         strcmp(hid, "PNP0A06")) {
237                 goto end;
238         }
239
240         switch(*action) {
241         case INSTALL_NOTIFY_HANDLER:
242                 acpi_install_notify_handler(handle,
243                         ACPI_SYSTEM_NOTIFY,
244                         container_notify_cb,
245                         NULL);
246                 break;
247         case UNINSTALL_NOTIFY_HANDLER:
248                 acpi_remove_notify_handler(handle,
249                         ACPI_SYSTEM_NOTIFY,
250                         container_notify_cb);
251                 break;
252         default:
253                 break;
254         }
255
256 end:
257         acpi_os_free(buffer.pointer);
258
259         return_ACPI_STATUS(AE_OK);
260 }
261
262
263 static int __init
264 acpi_container_init(void)
265 {
266         int     result = 0;
267         int     action = INSTALL_NOTIFY_HANDLER;
268
269         result = acpi_bus_register_driver(&acpi_container_driver);
270         if (result < 0) {
271                 return(result);
272         }
273
274         /* register notify handler to every container device */
275         acpi_walk_namespace(ACPI_TYPE_DEVICE,
276                                      ACPI_ROOT_OBJECT,
277                                      ACPI_UINT32_MAX,
278                                      container_walk_namespace_cb,
279                                      &action, NULL);
280
281         return(0);
282 }
283
284 static void __exit
285 acpi_container_exit(void)
286 {
287         int                     action = UNINSTALL_NOTIFY_HANDLER;
288
289         ACPI_FUNCTION_TRACE("acpi_container_exit");
290
291         acpi_walk_namespace(ACPI_TYPE_DEVICE,
292                                      ACPI_ROOT_OBJECT,
293                                      ACPI_UINT32_MAX,
294                                      container_walk_namespace_cb,
295                                      &action, NULL);
296
297         acpi_bus_unregister_driver(&acpi_container_driver);
298
299         return_VOID;
300 }
301
302 module_init(acpi_container_init);
303 module_exit(acpi_container_exit);