m68knommu: fix workqueues in 68328 serial driver
[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_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 struct acpi_driver acpi_container_driver = {
56         .name = "container",
57         .class = ACPI_CONTAINER_CLASS,
58         .ids = "ACPI0004,PNP0A05,PNP0A06",
59         .ops = {
60                 .add = acpi_container_add,
61                 .remove = acpi_container_remove,
62                 },
63 };
64
65 /*******************************************************************/
66
67 static int is_device_present(acpi_handle handle)
68 {
69         acpi_handle temp;
70         acpi_status status;
71         unsigned long sta;
72
73
74         status = acpi_get_handle(handle, "_STA", &temp);
75         if (ACPI_FAILURE(status))
76                 return 1;       /* _STA not found, assume device present */
77
78         status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
79         if (ACPI_FAILURE(status))
80                 return 0;       /* Firmware error */
81
82         return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
83 }
84
85 /*******************************************************************/
86 static int acpi_container_add(struct acpi_device *device)
87 {
88         struct acpi_container *container;
89
90
91         if (!device) {
92                 printk(KERN_ERR PREFIX "device is NULL\n");
93                 return -EINVAL;
94         }
95
96         container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
97         if (!container)
98                 return -ENOMEM;
99
100         container->handle = device->handle;
101         strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
102         strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
103         acpi_driver_data(device) = container;
104
105         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
106                           acpi_device_name(device), acpi_device_bid(device)));
107
108         return 0;
109 }
110
111 static int acpi_container_remove(struct acpi_device *device, int type)
112 {
113         acpi_status status = AE_OK;
114         struct acpi_container *pc = NULL;
115
116         pc = acpi_driver_data(device);
117         kfree(pc);
118         return status;
119 }
120
121 static int container_device_add(struct acpi_device **device, acpi_handle handle)
122 {
123         acpi_handle phandle;
124         struct acpi_device *pdev;
125         int result;
126
127
128         if (acpi_get_parent(handle, &phandle)) {
129                 return -ENODEV;
130         }
131
132         if (acpi_bus_get_device(phandle, &pdev)) {
133                 return -ENODEV;
134         }
135
136         if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
137                 return -ENODEV;
138         }
139
140         result = acpi_bus_start(*device);
141
142         return result;
143 }
144
145 static void container_notify_cb(acpi_handle handle, u32 type, void *context)
146 {
147         struct acpi_device *device = NULL;
148         int result;
149         int present;
150         acpi_status status;
151
152
153         present = is_device_present(handle);
154
155         switch (type) {
156         case ACPI_NOTIFY_BUS_CHECK:
157                 /* Fall through */
158         case ACPI_NOTIFY_DEVICE_CHECK:
159                 printk("Container driver received %s event\n",
160                        (type == ACPI_NOTIFY_BUS_CHECK) ?
161                        "ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
162                 status = acpi_bus_get_device(handle, &device);
163                 if (present) {
164                         if (ACPI_FAILURE(status) || !device) {
165                                 result = container_device_add(&device, handle);
166                                 if (!result)
167                                         kobject_uevent(&device->dev.kobj,
168                                                        KOBJ_ONLINE);
169                                 else
170                                         printk("Failed to add container\n");
171                         }
172                 } else {
173                         if (ACPI_SUCCESS(status)) {
174                                 /* device exist and this is a remove request */
175                                 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
176                         }
177                 }
178                 break;
179         case ACPI_NOTIFY_EJECT_REQUEST:
180                 if (!acpi_bus_get_device(handle, &device) && device) {
181                         kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
182                 }
183                 break;
184         default:
185                 break;
186         }
187         return;
188 }
189
190 static acpi_status
191 container_walk_namespace_cb(acpi_handle handle,
192                             u32 lvl, void *context, void **rv)
193 {
194         char *hid = NULL;
195         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
196         struct acpi_device_info *info;
197         acpi_status status;
198         int *action = context;
199
200
201         status = acpi_get_object_info(handle, &buffer);
202         if (ACPI_FAILURE(status) || !buffer.pointer) {
203                 return AE_OK;
204         }
205
206         info = buffer.pointer;
207         if (info->valid & ACPI_VALID_HID)
208                 hid = info->hardware_id.value;
209
210         if (hid == NULL) {
211                 goto end;
212         }
213
214         if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
215             strcmp(hid, "PNP0A06")) {
216                 goto end;
217         }
218
219         switch (*action) {
220         case INSTALL_NOTIFY_HANDLER:
221                 acpi_install_notify_handler(handle,
222                                             ACPI_SYSTEM_NOTIFY,
223                                             container_notify_cb, NULL);
224                 break;
225         case UNINSTALL_NOTIFY_HANDLER:
226                 acpi_remove_notify_handler(handle,
227                                            ACPI_SYSTEM_NOTIFY,
228                                            container_notify_cb);
229                 break;
230         default:
231                 break;
232         }
233
234       end:
235         kfree(buffer.pointer);
236
237         return AE_OK;
238 }
239
240 static int __init acpi_container_init(void)
241 {
242         int result = 0;
243         int action = INSTALL_NOTIFY_HANDLER;
244
245         result = acpi_bus_register_driver(&acpi_container_driver);
246         if (result < 0) {
247                 return (result);
248         }
249
250         /* register notify handler to every container device */
251         acpi_walk_namespace(ACPI_TYPE_DEVICE,
252                             ACPI_ROOT_OBJECT,
253                             ACPI_UINT32_MAX,
254                             container_walk_namespace_cb, &action, NULL);
255
256         return (0);
257 }
258
259 static void __exit acpi_container_exit(void)
260 {
261         int action = UNINSTALL_NOTIFY_HANDLER;
262
263
264         acpi_walk_namespace(ACPI_TYPE_DEVICE,
265                             ACPI_ROOT_OBJECT,
266                             ACPI_UINT32_MAX,
267                             container_walk_namespace_cb, &action, NULL);
268
269         acpi_bus_unregister_driver(&acpi_container_driver);
270
271         return;
272 }
273
274 module_init(acpi_container_init);
275 module_exit(acpi_container_exit);