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Commit | Line | Data |
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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 | */ | |
9 | #include <linux/init.h> | |
10 | #include <linux/list.h> | |
11 | #include <linux/device.h> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
4e10d12a DSL |
13 | #include <linux/rwsem.h> |
14 | #include <linux/acpi.h> | |
15 | ||
a192a958 LB |
16 | #include "internal.h" |
17 | ||
4e10d12a DSL |
18 | #define ACPI_GLUE_DEBUG 0 |
19 | #if ACPI_GLUE_DEBUG | |
20 | #define DBG(x...) printk(PREFIX x) | |
21 | #else | |
4ebf83c8 | 22 | #define DBG(x...) do { } while(0) |
4e10d12a DSL |
23 | #endif |
24 | static LIST_HEAD(bus_type_list); | |
25 | static DECLARE_RWSEM(bus_type_sem); | |
26 | ||
27 | int 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); | |
4be44fcd LB |
35 | printk(KERN_INFO PREFIX "bus type %s registered\n", |
36 | type->bus->name); | |
4e10d12a DSL |
37 | return 0; |
38 | } | |
39 | return -ENODEV; | |
40 | } | |
41 | ||
4e10d12a DSL |
42 | int 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); | |
4be44fcd LB |
50 | printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n", |
51 | type->bus->name); | |
4e10d12a DSL |
52 | return 0; |
53 | } | |
54 | return -ENODEV; | |
55 | } | |
56 | ||
4e10d12a DSL |
57 | static 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 | ||
72 | static 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 | ||
4e10d12a DSL |
88 | /* Get device's handler per its address under its parent */ |
89 | struct acpi_find_child { | |
90 | acpi_handle handle; | |
439913ff | 91 | u64 address; |
4e10d12a DSL |
92 | }; |
93 | ||
94 | static acpi_status | |
95 | do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv) | |
96 | { | |
97 | acpi_status status; | |
98 | struct acpi_device_info *info; | |
50dd0969 | 99 | struct acpi_find_child *find = context; |
4e10d12a | 100 | |
15b8dd53 | 101 | status = acpi_get_object_info(handle, &info); |
4e10d12a | 102 | if (ACPI_SUCCESS(status)) { |
4e10d12a DSL |
103 | if (info->address == find->address) |
104 | find->handle = handle; | |
15b8dd53 | 105 | kfree(info); |
4e10d12a DSL |
106 | } |
107 | return AE_OK; | |
108 | } | |
109 | ||
439913ff | 110 | acpi_handle acpi_get_child(acpi_handle parent, u64 address) |
4e10d12a DSL |
111 | { |
112 | struct acpi_find_child find = { NULL, address }; | |
113 | ||
114 | if (!parent) | |
115 | return NULL; | |
116 | acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, | |
2263576c | 117 | 1, do_acpi_find_child, NULL, &find, NULL); |
4e10d12a DSL |
118 | return find.handle; |
119 | } | |
120 | ||
121 | EXPORT_SYMBOL(acpi_get_child); | |
122 | ||
123 | /* Link ACPI devices with physical devices */ | |
124 | static void acpi_glue_data_handler(acpi_handle handle, | |
8e4319c4 | 125 | void *context) |
4e10d12a DSL |
126 | { |
127 | /* we provide an empty handler */ | |
128 | } | |
129 | ||
130 | /* Note: a success call will increase reference count by one */ | |
131 | struct device *acpi_get_physical_device(acpi_handle handle) | |
132 | { | |
133 | acpi_status status; | |
134 | struct device *dev; | |
135 | ||
136 | status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev); | |
137 | if (ACPI_SUCCESS(status)) | |
138 | return get_device(dev); | |
139 | return NULL; | |
140 | } | |
141 | ||
142 | EXPORT_SYMBOL(acpi_get_physical_device); | |
143 | ||
144 | static int acpi_bind_one(struct device *dev, acpi_handle handle) | |
145 | { | |
1071695f | 146 | struct acpi_device *acpi_dev; |
4e10d12a DSL |
147 | acpi_status status; |
148 | ||
465ae641 | 149 | if (dev->archdata.acpi_handle) { |
fc3a8828 | 150 | dev_warn(dev, "Drivers changed 'acpi_handle'\n"); |
4e10d12a DSL |
151 | return -EINVAL; |
152 | } | |
153 | get_device(dev); | |
154 | status = acpi_attach_data(handle, acpi_glue_data_handler, dev); | |
155 | if (ACPI_FAILURE(status)) { | |
156 | put_device(dev); | |
157 | return -EINVAL; | |
158 | } | |
465ae641 | 159 | dev->archdata.acpi_handle = handle; |
4e10d12a | 160 | |
1071695f DB |
161 | status = acpi_bus_get_device(handle, &acpi_dev); |
162 | if (!ACPI_FAILURE(status)) { | |
163 | int ret; | |
164 | ||
165 | ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj, | |
166 | "firmware_node"); | |
167 | ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, | |
168 | "physical_node"); | |
76acae04 | 169 | if (acpi_dev->wakeup.flags.valid) { |
eb9d0fe4 | 170 | device_set_wakeup_capable(dev, true); |
76acae04 RW |
171 | device_set_wakeup_enable(dev, |
172 | acpi_dev->wakeup.state.enabled); | |
173 | } | |
1071695f DB |
174 | } |
175 | ||
4e10d12a DSL |
176 | return 0; |
177 | } | |
178 | ||
179 | static int acpi_unbind_one(struct device *dev) | |
180 | { | |
465ae641 | 181 | if (!dev->archdata.acpi_handle) |
4e10d12a | 182 | return 0; |
465ae641 | 183 | if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) { |
1071695f DB |
184 | struct acpi_device *acpi_dev; |
185 | ||
4e10d12a DSL |
186 | /* acpi_get_physical_device increase refcnt by one */ |
187 | put_device(dev); | |
1071695f DB |
188 | |
189 | if (!acpi_bus_get_device(dev->archdata.acpi_handle, | |
190 | &acpi_dev)) { | |
191 | sysfs_remove_link(&dev->kobj, "firmware_node"); | |
192 | sysfs_remove_link(&acpi_dev->dev.kobj, "physical_node"); | |
193 | } | |
194 | ||
465ae641 BH |
195 | acpi_detach_data(dev->archdata.acpi_handle, |
196 | acpi_glue_data_handler); | |
197 | dev->archdata.acpi_handle = NULL; | |
4e10d12a DSL |
198 | /* acpi_bind_one increase refcnt by one */ |
199 | put_device(dev); | |
200 | } else { | |
fc3a8828 | 201 | dev_err(dev, "Oops, 'acpi_handle' corrupt\n"); |
4e10d12a DSL |
202 | } |
203 | return 0; | |
204 | } | |
205 | ||
206 | static int acpi_platform_notify(struct device *dev) | |
207 | { | |
208 | struct acpi_bus_type *type; | |
209 | acpi_handle handle; | |
210 | int ret = -EINVAL; | |
211 | ||
212 | if (!dev->bus || !dev->parent) { | |
213 | /* bridge devices genernally haven't bus or parent */ | |
214 | ret = acpi_find_bridge_device(dev, &handle); | |
215 | goto end; | |
216 | } | |
217 | type = acpi_get_bus_type(dev->bus); | |
218 | if (!type) { | |
db1461ad | 219 | DBG("No ACPI bus support for %s\n", dev_name(dev)); |
4e10d12a DSL |
220 | ret = -EINVAL; |
221 | goto end; | |
222 | } | |
223 | if ((ret = type->find_device(dev, &handle)) != 0) | |
db1461ad | 224 | DBG("Can't get handler for %s\n", dev_name(dev)); |
4e10d12a DSL |
225 | end: |
226 | if (!ret) | |
227 | acpi_bind_one(dev, handle); | |
228 | ||
229 | #if ACPI_GLUE_DEBUG | |
230 | if (!ret) { | |
231 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
232 | ||
465ae641 BH |
233 | acpi_get_name(dev->archdata.acpi_handle, |
234 | ACPI_FULL_PATHNAME, &buffer); | |
db1461ad | 235 | DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer); |
02438d87 | 236 | kfree(buffer.pointer); |
4e10d12a | 237 | } else |
db1461ad | 238 | DBG("Device %s -> No ACPI support\n", dev_name(dev)); |
4e10d12a DSL |
239 | #endif |
240 | ||
241 | return ret; | |
242 | } | |
243 | ||
244 | static int acpi_platform_notify_remove(struct device *dev) | |
245 | { | |
246 | acpi_unbind_one(dev); | |
247 | return 0; | |
248 | } | |
249 | ||
0e46517d | 250 | int __init init_acpi_device_notify(void) |
4e10d12a | 251 | { |
4e10d12a DSL |
252 | if (platform_notify || platform_notify_remove) { |
253 | printk(KERN_ERR PREFIX "Can't use platform_notify\n"); | |
254 | return 0; | |
255 | } | |
256 | platform_notify = acpi_platform_notify; | |
257 | platform_notify_remove = acpi_platform_notify_remove; | |
258 | return 0; | |
259 | } |