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9#include <linux/init.h>
10#include <linux/list.h>
11#include <linux/device.h>
12#include <linux/slab.h>
13#include <linux/rwsem.h>
14#include <linux/acpi.h>
15
16#include "internal.h"
17
18#define ACPI_GLUE_DEBUG 0
19#if ACPI_GLUE_DEBUG
20#define DBG(x...) printk(PREFIX x)
21#else
22#define DBG(x...) do { } while(0)
23#endif
24static LIST_HEAD(bus_type_list);
25static DECLARE_RWSEM(bus_type_sem);
26
27int register_acpi_bus_type(struct acpi_bus_type *type)
28{
29 if (acpi_disabled)
30 return -ENODEV;
31 if (type && type->bus && type->find_device) {
32 down_write(&bus_type_sem);
33 list_add_tail(&type->list, &bus_type_list);
34 up_write(&bus_type_sem);
35 printk(KERN_INFO PREFIX "bus type %s registered\n",
36 type->bus->name);
37 return 0;
38 }
39 return -ENODEV;
40}
41
42int unregister_acpi_bus_type(struct acpi_bus_type *type)
43{
44 if (acpi_disabled)
45 return 0;
46 if (type) {
47 down_write(&bus_type_sem);
48 list_del_init(&type->list);
49 up_write(&bus_type_sem);
50 printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
51 type->bus->name);
52 return 0;
53 }
54 return -ENODEV;
55}
56
57static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
58{
59 struct acpi_bus_type *tmp, *ret = NULL;
60
61 down_read(&bus_type_sem);
62 list_for_each_entry(tmp, &bus_type_list, list) {
63 if (tmp->bus == type) {
64 ret = tmp;
65 break;
66 }
67 }
68 up_read(&bus_type_sem);
69 return ret;
70}
71
72static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
73{
74 struct acpi_bus_type *tmp;
75 int ret = -ENODEV;
76
77 down_read(&bus_type_sem);
78 list_for_each_entry(tmp, &bus_type_list, list) {
79 if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
80 ret = 0;
81 break;
82 }
83 }
84 up_read(&bus_type_sem);
85 return ret;
86}
87
88
89struct acpi_find_child {
90 acpi_handle handle;
91 u64 address;
92};
93
94static acpi_status
95do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv)
96{
97 acpi_status status;
98 struct acpi_device_info *info;
99 struct acpi_find_child *find = context;
100
101 status = acpi_get_object_info(handle, &info);
102 if (ACPI_SUCCESS(status)) {
103 if ((info->address == find->address)
104 && (info->valid & ACPI_VALID_ADR))
105 find->handle = handle;
106 kfree(info);
107 }
108 return AE_OK;
109}
110
111acpi_handle acpi_get_child(acpi_handle parent, u64 address)
112{
113 struct acpi_find_child find = { NULL, address };
114
115 if (!parent)
116 return NULL;
117 acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
118 1, do_acpi_find_child, NULL, &find, NULL);
119 return find.handle;
120}
121
122EXPORT_SYMBOL(acpi_get_child);
123
124
125static void acpi_glue_data_handler(acpi_handle handle,
126 void *context)
127{
128
129}
130
131
132struct device *acpi_get_physical_device(acpi_handle handle)
133{
134 acpi_status status;
135 struct device *dev;
136
137 status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
138 if (ACPI_SUCCESS(status))
139 return get_device(dev);
140 return NULL;
141}
142
143EXPORT_SYMBOL(acpi_get_physical_device);
144
145static int acpi_bind_one(struct device *dev, acpi_handle handle)
146{
147 struct acpi_device *acpi_dev;
148 acpi_status status;
149
150 if (dev->archdata.acpi_handle) {
151 dev_warn(dev, "Drivers changed 'acpi_handle'\n");
152 return -EINVAL;
153 }
154 get_device(dev);
155 status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
156 if (ACPI_FAILURE(status)) {
157 put_device(dev);
158 return -EINVAL;
159 }
160 dev->archdata.acpi_handle = handle;
161
162 status = acpi_bus_get_device(handle, &acpi_dev);
163 if (!ACPI_FAILURE(status)) {
164 int ret;
165
166 ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
167 "firmware_node");
168 ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
169 "physical_node");
170 if (acpi_dev->wakeup.flags.valid)
171 device_set_wakeup_capable(dev, true);
172 }
173
174 return 0;
175}
176
177static int acpi_unbind_one(struct device *dev)
178{
179 if (!dev->archdata.acpi_handle)
180 return 0;
181 if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) {
182 struct acpi_device *acpi_dev;
183
184
185 put_device(dev);
186
187 if (!acpi_bus_get_device(dev->archdata.acpi_handle,
188 &acpi_dev)) {
189 sysfs_remove_link(&dev->kobj, "firmware_node");
190 sysfs_remove_link(&acpi_dev->dev.kobj, "physical_node");
191 }
192
193 acpi_detach_data(dev->archdata.acpi_handle,
194 acpi_glue_data_handler);
195 dev->archdata.acpi_handle = NULL;
196
197 put_device(dev);
198 } else {
199 dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
200 }
201 return 0;
202}
203
204static int acpi_platform_notify(struct device *dev)
205{
206 struct acpi_bus_type *type;
207 acpi_handle handle;
208 int ret = -EINVAL;
209
210 if (!dev->bus || !dev->parent) {
211
212 ret = acpi_find_bridge_device(dev, &handle);
213 goto end;
214 }
215 type = acpi_get_bus_type(dev->bus);
216 if (!type) {
217 DBG("No ACPI bus support for %s\n", dev_name(dev));
218 ret = -EINVAL;
219 goto end;
220 }
221 if ((ret = type->find_device(dev, &handle)) != 0)
222 DBG("Can't get handler for %s\n", dev_name(dev));
223 end:
224 if (!ret)
225 acpi_bind_one(dev, handle);
226
227#if ACPI_GLUE_DEBUG
228 if (!ret) {
229 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
230
231 acpi_get_name(dev->archdata.acpi_handle,
232 ACPI_FULL_PATHNAME, &buffer);
233 DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
234 kfree(buffer.pointer);
235 } else
236 DBG("Device %s -> No ACPI support\n", dev_name(dev));
237#endif
238
239 return ret;
240}
241
242static int acpi_platform_notify_remove(struct device *dev)
243{
244 acpi_unbind_one(dev);
245 return 0;
246}
247
248int __init init_acpi_device_notify(void)
249{
250 if (platform_notify || platform_notify_remove) {
251 printk(KERN_ERR PREFIX "Can't use platform_notify\n");
252 return 0;
253 }
254 platform_notify = acpi_platform_notify;
255 platform_notify_remove = acpi_platform_notify_remove;
256 return 0;
257}
258
