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 | } | |
91e4d5a1 | 42 | EXPORT_SYMBOL_GPL(register_acpi_bus_type); |
4e10d12a | 43 | |
4e10d12a DSL |
44 | int unregister_acpi_bus_type(struct acpi_bus_type *type) |
45 | { | |
46 | if (acpi_disabled) | |
47 | return 0; | |
48 | if (type) { | |
49 | down_write(&bus_type_sem); | |
50 | list_del_init(&type->list); | |
51 | up_write(&bus_type_sem); | |
4be44fcd LB |
52 | printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n", |
53 | type->bus->name); | |
4e10d12a DSL |
54 | return 0; |
55 | } | |
56 | return -ENODEV; | |
57 | } | |
91e4d5a1 | 58 | EXPORT_SYMBOL_GPL(unregister_acpi_bus_type); |
4e10d12a | 59 | |
4e10d12a DSL |
60 | static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type) |
61 | { | |
62 | struct acpi_bus_type *tmp, *ret = NULL; | |
63 | ||
64 | down_read(&bus_type_sem); | |
65 | list_for_each_entry(tmp, &bus_type_list, list) { | |
66 | if (tmp->bus == type) { | |
67 | ret = tmp; | |
68 | break; | |
69 | } | |
70 | } | |
71 | up_read(&bus_type_sem); | |
72 | return ret; | |
73 | } | |
74 | ||
75 | static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle) | |
76 | { | |
77 | struct acpi_bus_type *tmp; | |
78 | int ret = -ENODEV; | |
79 | ||
80 | down_read(&bus_type_sem); | |
81 | list_for_each_entry(tmp, &bus_type_list, list) { | |
82 | if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) { | |
83 | ret = 0; | |
84 | break; | |
85 | } | |
86 | } | |
87 | up_read(&bus_type_sem); | |
88 | return ret; | |
89 | } | |
90 | ||
4e10d12a DSL |
91 | /* Get device's handler per its address under its parent */ |
92 | struct acpi_find_child { | |
93 | acpi_handle handle; | |
439913ff | 94 | u64 address; |
4e10d12a DSL |
95 | }; |
96 | ||
97 | static acpi_status | |
98 | do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv) | |
99 | { | |
100 | acpi_status status; | |
101 | struct acpi_device_info *info; | |
50dd0969 | 102 | struct acpi_find_child *find = context; |
4e10d12a | 103 | |
15b8dd53 | 104 | status = acpi_get_object_info(handle, &info); |
4e10d12a | 105 | if (ACPI_SUCCESS(status)) { |
108029ff ZY |
106 | if ((info->address == find->address) |
107 | && (info->valid & ACPI_VALID_ADR)) | |
4e10d12a | 108 | find->handle = handle; |
15b8dd53 | 109 | kfree(info); |
4e10d12a DSL |
110 | } |
111 | return AE_OK; | |
112 | } | |
113 | ||
439913ff | 114 | acpi_handle acpi_get_child(acpi_handle parent, u64 address) |
4e10d12a DSL |
115 | { |
116 | struct acpi_find_child find = { NULL, address }; | |
117 | ||
118 | if (!parent) | |
119 | return NULL; | |
120 | acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, | |
2263576c | 121 | 1, do_acpi_find_child, NULL, &find, NULL); |
4e10d12a DSL |
122 | return find.handle; |
123 | } | |
124 | ||
125 | EXPORT_SYMBOL(acpi_get_child); | |
126 | ||
127 | /* Link ACPI devices with physical devices */ | |
128 | static void acpi_glue_data_handler(acpi_handle handle, | |
8e4319c4 | 129 | void *context) |
4e10d12a DSL |
130 | { |
131 | /* we provide an empty handler */ | |
132 | } | |
133 | ||
134 | /* Note: a success call will increase reference count by one */ | |
135 | struct device *acpi_get_physical_device(acpi_handle handle) | |
136 | { | |
137 | acpi_status status; | |
138 | struct device *dev; | |
139 | ||
140 | status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev); | |
141 | if (ACPI_SUCCESS(status)) | |
142 | return get_device(dev); | |
143 | return NULL; | |
144 | } | |
145 | ||
146 | EXPORT_SYMBOL(acpi_get_physical_device); | |
147 | ||
148 | static int acpi_bind_one(struct device *dev, acpi_handle handle) | |
149 | { | |
1071695f | 150 | struct acpi_device *acpi_dev; |
4e10d12a DSL |
151 | acpi_status status; |
152 | ||
465ae641 | 153 | if (dev->archdata.acpi_handle) { |
fc3a8828 | 154 | dev_warn(dev, "Drivers changed 'acpi_handle'\n"); |
4e10d12a DSL |
155 | return -EINVAL; |
156 | } | |
157 | get_device(dev); | |
158 | status = acpi_attach_data(handle, acpi_glue_data_handler, dev); | |
159 | if (ACPI_FAILURE(status)) { | |
160 | put_device(dev); | |
161 | return -EINVAL; | |
162 | } | |
465ae641 | 163 | dev->archdata.acpi_handle = handle; |
4e10d12a | 164 | |
1071695f DB |
165 | status = acpi_bus_get_device(handle, &acpi_dev); |
166 | if (!ACPI_FAILURE(status)) { | |
167 | int ret; | |
168 | ||
169 | ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj, | |
170 | "firmware_node"); | |
171 | ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, | |
172 | "physical_node"); | |
7fa69baf | 173 | if (acpi_dev->wakeup.flags.valid) |
eb9d0fe4 | 174 | device_set_wakeup_capable(dev, true); |
1071695f DB |
175 | } |
176 | ||
4e10d12a DSL |
177 | return 0; |
178 | } | |
179 | ||
180 | static int acpi_unbind_one(struct device *dev) | |
181 | { | |
465ae641 | 182 | if (!dev->archdata.acpi_handle) |
4e10d12a | 183 | return 0; |
465ae641 | 184 | if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) { |
1071695f DB |
185 | struct acpi_device *acpi_dev; |
186 | ||
4e10d12a DSL |
187 | /* acpi_get_physical_device increase refcnt by one */ |
188 | put_device(dev); | |
1071695f DB |
189 | |
190 | if (!acpi_bus_get_device(dev->archdata.acpi_handle, | |
191 | &acpi_dev)) { | |
192 | sysfs_remove_link(&dev->kobj, "firmware_node"); | |
193 | sysfs_remove_link(&acpi_dev->dev.kobj, "physical_node"); | |
194 | } | |
195 | ||
465ae641 BH |
196 | acpi_detach_data(dev->archdata.acpi_handle, |
197 | acpi_glue_data_handler); | |
198 | dev->archdata.acpi_handle = NULL; | |
4e10d12a DSL |
199 | /* acpi_bind_one increase refcnt by one */ |
200 | put_device(dev); | |
201 | } else { | |
fc3a8828 | 202 | dev_err(dev, "Oops, 'acpi_handle' corrupt\n"); |
4e10d12a DSL |
203 | } |
204 | return 0; | |
205 | } | |
206 | ||
207 | static int acpi_platform_notify(struct device *dev) | |
208 | { | |
209 | struct acpi_bus_type *type; | |
210 | acpi_handle handle; | |
211 | int ret = -EINVAL; | |
212 | ||
213 | if (!dev->bus || !dev->parent) { | |
214 | /* bridge devices genernally haven't bus or parent */ | |
215 | ret = acpi_find_bridge_device(dev, &handle); | |
216 | goto end; | |
217 | } | |
218 | type = acpi_get_bus_type(dev->bus); | |
219 | if (!type) { | |
db1461ad | 220 | DBG("No ACPI bus support for %s\n", dev_name(dev)); |
4e10d12a DSL |
221 | ret = -EINVAL; |
222 | goto end; | |
223 | } | |
224 | if ((ret = type->find_device(dev, &handle)) != 0) | |
db1461ad | 225 | DBG("Can't get handler for %s\n", dev_name(dev)); |
4e10d12a DSL |
226 | end: |
227 | if (!ret) | |
228 | acpi_bind_one(dev, handle); | |
229 | ||
230 | #if ACPI_GLUE_DEBUG | |
231 | if (!ret) { | |
232 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
233 | ||
465ae641 BH |
234 | acpi_get_name(dev->archdata.acpi_handle, |
235 | ACPI_FULL_PATHNAME, &buffer); | |
db1461ad | 236 | DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer); |
02438d87 | 237 | kfree(buffer.pointer); |
4e10d12a | 238 | } else |
db1461ad | 239 | DBG("Device %s -> No ACPI support\n", dev_name(dev)); |
4e10d12a DSL |
240 | #endif |
241 | ||
242 | return ret; | |
243 | } | |
244 | ||
245 | static int acpi_platform_notify_remove(struct device *dev) | |
246 | { | |
247 | acpi_unbind_one(dev); | |
248 | return 0; | |
249 | } | |
250 | ||
0e46517d | 251 | int __init init_acpi_device_notify(void) |
4e10d12a | 252 | { |
4e10d12a DSL |
253 | if (platform_notify || platform_notify_remove) { |
254 | printk(KERN_ERR PREFIX "Can't use platform_notify\n"); | |
255 | return 0; | |
256 | } | |
257 | platform_notify = acpi_platform_notify; | |
258 | platform_notify_remove = acpi_platform_notify_remove; | |
259 | return 0; | |
260 | } |