Commit | Line | Data |
---|---|---|
4e10d12a DSL |
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 | */ | |
214f2c90 | 9 | #include <linux/export.h> |
4e10d12a DSL |
10 | #include <linux/init.h> |
11 | #include <linux/list.h> | |
12 | #include <linux/device.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
4e10d12a DSL |
14 | #include <linux/rwsem.h> |
15 | #include <linux/acpi.h> | |
16 | ||
a192a958 LB |
17 | #include "internal.h" |
18 | ||
4e10d12a DSL |
19 | #define ACPI_GLUE_DEBUG 0 |
20 | #if ACPI_GLUE_DEBUG | |
21 | #define DBG(x...) printk(PREFIX x) | |
22 | #else | |
4ebf83c8 | 23 | #define DBG(x...) do { } while(0) |
4e10d12a DSL |
24 | #endif |
25 | static LIST_HEAD(bus_type_list); | |
26 | static DECLARE_RWSEM(bus_type_sem); | |
27 | ||
28 | int register_acpi_bus_type(struct acpi_bus_type *type) | |
29 | { | |
30 | if (acpi_disabled) | |
31 | return -ENODEV; | |
32 | if (type && type->bus && type->find_device) { | |
33 | down_write(&bus_type_sem); | |
34 | list_add_tail(&type->list, &bus_type_list); | |
35 | up_write(&bus_type_sem); | |
4be44fcd LB |
36 | printk(KERN_INFO PREFIX "bus type %s registered\n", |
37 | type->bus->name); | |
4e10d12a DSL |
38 | return 0; |
39 | } | |
40 | return -ENODEV; | |
41 | } | |
42 | ||
4e10d12a DSL |
43 | int unregister_acpi_bus_type(struct acpi_bus_type *type) |
44 | { | |
45 | if (acpi_disabled) | |
46 | return 0; | |
47 | if (type) { | |
48 | down_write(&bus_type_sem); | |
49 | list_del_init(&type->list); | |
50 | up_write(&bus_type_sem); | |
4be44fcd LB |
51 | printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n", |
52 | type->bus->name); | |
4e10d12a DSL |
53 | return 0; |
54 | } | |
55 | return -ENODEV; | |
56 | } | |
57 | ||
4e10d12a DSL |
58 | static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type) |
59 | { | |
60 | struct acpi_bus_type *tmp, *ret = NULL; | |
61 | ||
62 | down_read(&bus_type_sem); | |
63 | list_for_each_entry(tmp, &bus_type_list, list) { | |
64 | if (tmp->bus == type) { | |
65 | ret = tmp; | |
66 | break; | |
67 | } | |
68 | } | |
69 | up_read(&bus_type_sem); | |
70 | return ret; | |
71 | } | |
72 | ||
73 | static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle) | |
74 | { | |
75 | struct acpi_bus_type *tmp; | |
76 | int ret = -ENODEV; | |
77 | ||
78 | down_read(&bus_type_sem); | |
79 | list_for_each_entry(tmp, &bus_type_list, list) { | |
80 | if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) { | |
81 | ret = 0; | |
82 | break; | |
83 | } | |
84 | } | |
85 | up_read(&bus_type_sem); | |
86 | return ret; | |
87 | } | |
88 | ||
4e10d12a DSL |
89 | /* Get device's handler per its address under its parent */ |
90 | struct acpi_find_child { | |
91 | acpi_handle handle; | |
439913ff | 92 | u64 address; |
4e10d12a DSL |
93 | }; |
94 | ||
95 | static acpi_status | |
96 | do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv) | |
97 | { | |
98 | acpi_status status; | |
99 | struct acpi_device_info *info; | |
50dd0969 | 100 | struct acpi_find_child *find = context; |
4e10d12a | 101 | |
15b8dd53 | 102 | status = acpi_get_object_info(handle, &info); |
4e10d12a | 103 | if (ACPI_SUCCESS(status)) { |
108029ff ZY |
104 | if ((info->address == find->address) |
105 | && (info->valid & ACPI_VALID_ADR)) | |
4e10d12a | 106 | find->handle = handle; |
15b8dd53 | 107 | kfree(info); |
4e10d12a DSL |
108 | } |
109 | return AE_OK; | |
110 | } | |
111 | ||
439913ff | 112 | acpi_handle acpi_get_child(acpi_handle parent, u64 address) |
4e10d12a DSL |
113 | { |
114 | struct acpi_find_child find = { NULL, address }; | |
115 | ||
116 | if (!parent) | |
117 | return NULL; | |
118 | acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, | |
2263576c | 119 | 1, do_acpi_find_child, NULL, &find, NULL); |
4e10d12a DSL |
120 | return find.handle; |
121 | } | |
122 | ||
123 | EXPORT_SYMBOL(acpi_get_child); | |
124 | ||
125 | /* Link ACPI devices with physical devices */ | |
126 | static void acpi_glue_data_handler(acpi_handle handle, | |
8e4319c4 | 127 | void *context) |
4e10d12a DSL |
128 | { |
129 | /* we provide an empty handler */ | |
130 | } | |
131 | ||
132 | /* Note: a success call will increase reference count by one */ | |
133 | struct device *acpi_get_physical_device(acpi_handle handle) | |
134 | { | |
135 | acpi_status status; | |
136 | struct device *dev; | |
137 | ||
138 | status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev); | |
139 | if (ACPI_SUCCESS(status)) | |
140 | return get_device(dev); | |
141 | return NULL; | |
142 | } | |
143 | ||
144 | EXPORT_SYMBOL(acpi_get_physical_device); | |
145 | ||
146 | static int acpi_bind_one(struct device *dev, acpi_handle handle) | |
147 | { | |
1071695f | 148 | struct acpi_device *acpi_dev; |
4e10d12a DSL |
149 | acpi_status status; |
150 | ||
465ae641 | 151 | if (dev->archdata.acpi_handle) { |
fc3a8828 | 152 | dev_warn(dev, "Drivers changed 'acpi_handle'\n"); |
4e10d12a DSL |
153 | return -EINVAL; |
154 | } | |
155 | get_device(dev); | |
156 | status = acpi_attach_data(handle, acpi_glue_data_handler, dev); | |
157 | if (ACPI_FAILURE(status)) { | |
158 | put_device(dev); | |
159 | return -EINVAL; | |
160 | } | |
465ae641 | 161 | dev->archdata.acpi_handle = handle; |
4e10d12a | 162 | |
1071695f DB |
163 | status = acpi_bus_get_device(handle, &acpi_dev); |
164 | if (!ACPI_FAILURE(status)) { | |
165 | int ret; | |
166 | ||
167 | ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj, | |
168 | "firmware_node"); | |
169 | ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, | |
170 | "physical_node"); | |
7fa69baf | 171 | if (acpi_dev->wakeup.flags.valid) |
eb9d0fe4 | 172 | device_set_wakeup_capable(dev, true); |
1071695f DB |
173 | } |
174 | ||
4e10d12a DSL |
175 | return 0; |
176 | } | |
177 | ||
178 | static int acpi_unbind_one(struct device *dev) | |
179 | { | |
465ae641 | 180 | if (!dev->archdata.acpi_handle) |
4e10d12a | 181 | return 0; |
465ae641 | 182 | if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) { |
1071695f DB |
183 | struct acpi_device *acpi_dev; |
184 | ||
4e10d12a DSL |
185 | /* acpi_get_physical_device increase refcnt by one */ |
186 | put_device(dev); | |
1071695f DB |
187 | |
188 | if (!acpi_bus_get_device(dev->archdata.acpi_handle, | |
189 | &acpi_dev)) { | |
190 | sysfs_remove_link(&dev->kobj, "firmware_node"); | |
191 | sysfs_remove_link(&acpi_dev->dev.kobj, "physical_node"); | |
192 | } | |
193 | ||
465ae641 BH |
194 | acpi_detach_data(dev->archdata.acpi_handle, |
195 | acpi_glue_data_handler); | |
196 | dev->archdata.acpi_handle = NULL; | |
4e10d12a DSL |
197 | /* acpi_bind_one increase refcnt by one */ |
198 | put_device(dev); | |
199 | } else { | |
fc3a8828 | 200 | dev_err(dev, "Oops, 'acpi_handle' corrupt\n"); |
4e10d12a DSL |
201 | } |
202 | return 0; | |
203 | } | |
204 | ||
205 | static int acpi_platform_notify(struct device *dev) | |
206 | { | |
207 | struct acpi_bus_type *type; | |
208 | acpi_handle handle; | |
209 | int ret = -EINVAL; | |
210 | ||
211 | if (!dev->bus || !dev->parent) { | |
212 | /* bridge devices genernally haven't bus or parent */ | |
213 | ret = acpi_find_bridge_device(dev, &handle); | |
214 | goto end; | |
215 | } | |
216 | type = acpi_get_bus_type(dev->bus); | |
217 | if (!type) { | |
db1461ad | 218 | DBG("No ACPI bus support for %s\n", dev_name(dev)); |
4e10d12a DSL |
219 | ret = -EINVAL; |
220 | goto end; | |
221 | } | |
222 | if ((ret = type->find_device(dev, &handle)) != 0) | |
db1461ad | 223 | DBG("Can't get handler for %s\n", dev_name(dev)); |
4e10d12a DSL |
224 | end: |
225 | if (!ret) | |
226 | acpi_bind_one(dev, handle); | |
227 | ||
228 | #if ACPI_GLUE_DEBUG | |
229 | if (!ret) { | |
230 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
231 | ||
465ae641 BH |
232 | acpi_get_name(dev->archdata.acpi_handle, |
233 | ACPI_FULL_PATHNAME, &buffer); | |
db1461ad | 234 | DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer); |
02438d87 | 235 | kfree(buffer.pointer); |
4e10d12a | 236 | } else |
db1461ad | 237 | DBG("Device %s -> No ACPI support\n", dev_name(dev)); |
4e10d12a DSL |
238 | #endif |
239 | ||
240 | return ret; | |
241 | } | |
242 | ||
243 | static int acpi_platform_notify_remove(struct device *dev) | |
244 | { | |
245 | acpi_unbind_one(dev); | |
246 | return 0; | |
247 | } | |
248 | ||
0e46517d | 249 | int __init init_acpi_device_notify(void) |
4e10d12a | 250 | { |
4e10d12a DSL |
251 | if (platform_notify || platform_notify_remove) { |
252 | printk(KERN_ERR PREFIX "Can't use platform_notify\n"); | |
253 | return 0; | |
254 | } | |
255 | platform_notify = acpi_platform_notify; | |
256 | platform_notify_remove = acpi_platform_notify_remove; | |
257 | return 0; | |
258 | } |