ACPI: Change acpi_evaluate_integer to support 64-bit on 32-bit kernels
[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 ACPI_CONTAINER_COMPONENT        0x01000000
45 #define _COMPONENT                      ACPI_CONTAINER_COMPONENT
46 ACPI_MODULE_NAME("container");
47
48 MODULE_AUTHOR("Anil S Keshavamurthy");
49 MODULE_DESCRIPTION("ACPI container driver");
50 MODULE_LICENSE("GPL");
51
52 static int acpi_container_add(struct acpi_device *device);
53 static int acpi_container_remove(struct acpi_device *device, int type);
54
55 static const struct acpi_device_id container_device_ids[] = {
56         {"ACPI0004", 0},
57         {"PNP0A05", 0},
58         {"PNP0A06", 0},
59         {"", 0},
60 };
61 MODULE_DEVICE_TABLE(acpi, container_device_ids);
62
63 static struct acpi_driver acpi_container_driver = {
64         .name = "container",
65         .class = ACPI_CONTAINER_CLASS,
66         .ids = container_device_ids,
67         .ops = {
68                 .add = acpi_container_add,
69                 .remove = acpi_container_remove,
70                 },
71 };
72
73 /*******************************************************************/
74
75 static int is_device_present(acpi_handle handle)
76 {
77         acpi_handle temp;
78         acpi_status status;
79         unsigned long long sta;
80
81
82         status = acpi_get_handle(handle, "_STA", &temp);
83         if (ACPI_FAILURE(status))
84                 return 1;       /* _STA not found, assume device present */
85
86         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
87         if (ACPI_FAILURE(status))
88                 return 0;       /* Firmware error */
89
90         return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
91 }
92
93 /*******************************************************************/
94 static int acpi_container_add(struct acpi_device *device)
95 {
96         struct acpi_container *container;
97
98
99         if (!device) {
100                 printk(KERN_ERR PREFIX "device is NULL\n");
101                 return -EINVAL;
102         }
103
104         container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
105         if (!container)
106                 return -ENOMEM;
107
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;
112
113         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
114                           acpi_device_name(device), acpi_device_bid(device)));
115
116         return 0;
117 }
118
119 static int acpi_container_remove(struct acpi_device *device, int type)
120 {
121         acpi_status status = AE_OK;
122         struct acpi_container *pc = NULL;
123
124         pc = acpi_driver_data(device);
125         kfree(pc);
126         return status;
127 }
128
129 static int container_device_add(struct acpi_device **device, acpi_handle handle)
130 {
131         acpi_handle phandle;
132         struct acpi_device *pdev;
133         int result;
134
135
136         if (acpi_get_parent(handle, &phandle)) {
137                 return -ENODEV;
138         }
139
140         if (acpi_bus_get_device(phandle, &pdev)) {
141                 return -ENODEV;
142         }
143
144         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
145                 return -ENODEV;
146         }
147
148         result = acpi_bus_start(*device);
149
150         return result;
151 }
152
153 static void container_notify_cb(acpi_handle handle, u32 type, void *context)
154 {
155         struct acpi_device *device = NULL;
156         int result;
157         int present;
158         acpi_status status;
159
160
161         present = is_device_present(handle);
162
163         switch (type) {
164         case ACPI_NOTIFY_BUS_CHECK:
165                 /* Fall through */
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);
171                 if (present) {
172                         if (ACPI_FAILURE(status) || !device) {
173                                 result = container_device_add(&device, handle);
174                                 if (!result)
175                                         kobject_uevent(&device->dev.kobj,
176                                                        KOBJ_ONLINE);
177                                 else
178                                         printk("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_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
204         struct acpi_device_info *info;
205         acpi_status status;
206         int *action = context;
207
208
209         status = acpi_get_object_info(handle, &buffer);
210         if (ACPI_FAILURE(status) || !buffer.pointer) {
211                 return AE_OK;
212         }
213
214         info = buffer.pointer;
215         if (info->valid & ACPI_VALID_HID)
216                 hid = info->hardware_id.value;
217
218         if (hid == NULL) {
219                 goto end;
220         }
221
222         if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
223             strcmp(hid, "PNP0A06")) {
224                 goto end;
225         }
226
227         switch (*action) {
228         case INSTALL_NOTIFY_HANDLER:
229                 acpi_install_notify_handler(handle,
230                                             ACPI_SYSTEM_NOTIFY,
231                                             container_notify_cb, NULL);
232                 break;
233         case UNINSTALL_NOTIFY_HANDLER:
234                 acpi_remove_notify_handler(handle,
235                                            ACPI_SYSTEM_NOTIFY,
236                                            container_notify_cb);
237                 break;
238         default:
239                 break;
240         }
241
242       end:
243         kfree(buffer.pointer);
244
245         return AE_OK;
246 }
247
248 static int __init acpi_container_init(void)
249 {
250         int result = 0;
251         int action = INSTALL_NOTIFY_HANDLER;
252
253         result = acpi_bus_register_driver(&acpi_container_driver);
254         if (result < 0) {
255                 return (result);
256         }
257
258         /* register notify handler to every container device */
259         acpi_walk_namespace(ACPI_TYPE_DEVICE,
260                             ACPI_ROOT_OBJECT,
261                             ACPI_UINT32_MAX,
262                             container_walk_namespace_cb, &action, NULL);
263
264         return (0);
265 }
266
267 static void __exit acpi_container_exit(void)
268 {
269         int action = UNINSTALL_NOTIFY_HANDLER;
270
271
272         acpi_walk_namespace(ACPI_TYPE_DEVICE,
273                             ACPI_ROOT_OBJECT,
274                             ACPI_UINT32_MAX,
275                             container_walk_namespace_cb, &action, NULL);
276
277         acpi_bus_unregister_driver(&acpi_container_driver);
278
279         return;
280 }
281
282 module_init(acpi_container_init);
283 module_exit(acpi_container_exit);