ACPICA: Major update for acpi_get_object_info external interface
[linux-2.6.git] / drivers / acpi / glue.c
1 /*
2  * Link physical devices with ACPI devices support
3  *
4  * Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
5  * Copyright (c) 2005 Intel Corp.
6  *
7  * This file is released under the GPLv2.
8  */
9 #include <linux/init.h>
10 #include <linux/list.h>
11 #include <linux/device.h>
12 #include <linux/rwsem.h>
13 #include <linux/acpi.h>
14
15 #define ACPI_GLUE_DEBUG 0
16 #if ACPI_GLUE_DEBUG
17 #define DBG(x...) printk(PREFIX x)
18 #else
19 #define DBG(x...) do { } while(0)
20 #endif
21 static LIST_HEAD(bus_type_list);
22 static DECLARE_RWSEM(bus_type_sem);
23
24 int register_acpi_bus_type(struct acpi_bus_type *type)
25 {
26         if (acpi_disabled)
27                 return -ENODEV;
28         if (type && type->bus && type->find_device) {
29                 down_write(&bus_type_sem);
30                 list_add_tail(&type->list, &bus_type_list);
31                 up_write(&bus_type_sem);
32                 printk(KERN_INFO PREFIX "bus type %s registered\n",
33                        type->bus->name);
34                 return 0;
35         }
36         return -ENODEV;
37 }
38
39 int unregister_acpi_bus_type(struct acpi_bus_type *type)
40 {
41         if (acpi_disabled)
42                 return 0;
43         if (type) {
44                 down_write(&bus_type_sem);
45                 list_del_init(&type->list);
46                 up_write(&bus_type_sem);
47                 printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
48                        type->bus->name);
49                 return 0;
50         }
51         return -ENODEV;
52 }
53
54 static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
55 {
56         struct acpi_bus_type *tmp, *ret = NULL;
57
58         down_read(&bus_type_sem);
59         list_for_each_entry(tmp, &bus_type_list, list) {
60                 if (tmp->bus == type) {
61                         ret = tmp;
62                         break;
63                 }
64         }
65         up_read(&bus_type_sem);
66         return ret;
67 }
68
69 static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
70 {
71         struct acpi_bus_type *tmp;
72         int ret = -ENODEV;
73
74         down_read(&bus_type_sem);
75         list_for_each_entry(tmp, &bus_type_list, list) {
76                 if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
77                         ret = 0;
78                         break;
79                 }
80         }
81         up_read(&bus_type_sem);
82         return ret;
83 }
84
85 /* Get device's handler per its address under its parent */
86 struct acpi_find_child {
87         acpi_handle handle;
88         acpi_integer address;
89 };
90
91 static acpi_status
92 do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv)
93 {
94         acpi_status status;
95         struct acpi_device_info *info;
96         struct acpi_find_child *find = context;
97
98         status = acpi_get_object_info(handle, &info);
99         if (ACPI_SUCCESS(status)) {
100                 if (info->address == find->address)
101                         find->handle = handle;
102                 kfree(info);
103         }
104         return AE_OK;
105 }
106
107 acpi_handle acpi_get_child(acpi_handle parent, acpi_integer address)
108 {
109         struct acpi_find_child find = { NULL, address };
110
111         if (!parent)
112                 return NULL;
113         acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
114                             1, do_acpi_find_child, &find, NULL);
115         return find.handle;
116 }
117
118 EXPORT_SYMBOL(acpi_get_child);
119
120 /* Link ACPI devices with physical devices */
121 static void acpi_glue_data_handler(acpi_handle handle,
122                                    u32 function, void *context)
123 {
124         /* we provide an empty handler */
125 }
126
127 /* Note: a success call will increase reference count by one */
128 struct device *acpi_get_physical_device(acpi_handle handle)
129 {
130         acpi_status status;
131         struct device *dev;
132
133         status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
134         if (ACPI_SUCCESS(status))
135                 return get_device(dev);
136         return NULL;
137 }
138
139 EXPORT_SYMBOL(acpi_get_physical_device);
140
141 static int acpi_bind_one(struct device *dev, acpi_handle handle)
142 {
143         struct acpi_device *acpi_dev;
144         acpi_status status;
145
146         if (dev->archdata.acpi_handle) {
147                 dev_warn(dev, "Drivers changed 'acpi_handle'\n");
148                 return -EINVAL;
149         }
150         get_device(dev);
151         status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
152         if (ACPI_FAILURE(status)) {
153                 put_device(dev);
154                 return -EINVAL;
155         }
156         dev->archdata.acpi_handle = handle;
157
158         status = acpi_bus_get_device(handle, &acpi_dev);
159         if (!ACPI_FAILURE(status)) {
160                 int ret;
161
162                 ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
163                                 "firmware_node");
164                 ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
165                                 "physical_node");
166                 if (acpi_dev->wakeup.flags.valid) {
167                         device_set_wakeup_capable(dev, true);
168                         device_set_wakeup_enable(dev,
169                                                 acpi_dev->wakeup.state.enabled);
170                 }
171         }
172
173         return 0;
174 }
175
176 static int acpi_unbind_one(struct device *dev)
177 {
178         if (!dev->archdata.acpi_handle)
179                 return 0;
180         if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) {
181                 struct acpi_device *acpi_dev;
182
183                 /* acpi_get_physical_device increase refcnt by one */
184                 put_device(dev);
185
186                 if (!acpi_bus_get_device(dev->archdata.acpi_handle,
187                                         &acpi_dev)) {
188                         sysfs_remove_link(&dev->kobj, "firmware_node");
189                         sysfs_remove_link(&acpi_dev->dev.kobj, "physical_node");
190                 }
191
192                 acpi_detach_data(dev->archdata.acpi_handle,
193                                  acpi_glue_data_handler);
194                 dev->archdata.acpi_handle = NULL;
195                 /* acpi_bind_one increase refcnt by one */
196                 put_device(dev);
197         } else {
198                 dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
199         }
200         return 0;
201 }
202
203 static int acpi_platform_notify(struct device *dev)
204 {
205         struct acpi_bus_type *type;
206         acpi_handle handle;
207         int ret = -EINVAL;
208
209         if (!dev->bus || !dev->parent) {
210                 /* bridge devices genernally haven't bus or parent */
211                 ret = acpi_find_bridge_device(dev, &handle);
212                 goto end;
213         }
214         type = acpi_get_bus_type(dev->bus);
215         if (!type) {
216                 DBG("No ACPI bus support for %s\n", dev_name(dev));
217                 ret = -EINVAL;
218                 goto end;
219         }
220         if ((ret = type->find_device(dev, &handle)) != 0)
221                 DBG("Can't get handler for %s\n", dev_name(dev));
222       end:
223         if (!ret)
224                 acpi_bind_one(dev, handle);
225
226 #if ACPI_GLUE_DEBUG
227         if (!ret) {
228                 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
229
230                 acpi_get_name(dev->archdata.acpi_handle,
231                               ACPI_FULL_PATHNAME, &buffer);
232                 DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
233                 kfree(buffer.pointer);
234         } else
235                 DBG("Device %s -> No ACPI support\n", dev_name(dev));
236 #endif
237
238         return ret;
239 }
240
241 static int acpi_platform_notify_remove(struct device *dev)
242 {
243         acpi_unbind_one(dev);
244         return 0;
245 }
246
247 int __init init_acpi_device_notify(void)
248 {
249         if (platform_notify || platform_notify_remove) {
250                 printk(KERN_ERR PREFIX "Can't use platform_notify\n");
251                 return 0;
252         }
253         platform_notify = acpi_platform_notify;
254         platform_notify_remove = acpi_platform_notify_remove;
255         return 0;
256 }