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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 | */ | |
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 | |
23415eb5 JP |
21 | #define DBG(fmt, ...) \ |
22 | printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__) | |
4e10d12a | 23 | #else |
23415eb5 JP |
24 | #define DBG(fmt, ...) \ |
25 | do { \ | |
26 | if (0) \ | |
27 | printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__); \ | |
28 | } while (0) | |
4e10d12a DSL |
29 | #endif |
30 | static LIST_HEAD(bus_type_list); | |
31 | static DECLARE_RWSEM(bus_type_sem); | |
32 | ||
1033f904 | 33 | #define PHYSICAL_NODE_STRING "physical_node" |
007ccfcf | 34 | #define PHYSICAL_NODE_NAME_SIZE (sizeof(PHYSICAL_NODE_STRING) + 10) |
1033f904 | 35 | |
4e10d12a DSL |
36 | int register_acpi_bus_type(struct acpi_bus_type *type) |
37 | { | |
38 | if (acpi_disabled) | |
39 | return -ENODEV; | |
e3f02c52 | 40 | if (type && type->match && type->find_companion) { |
4e10d12a DSL |
41 | down_write(&bus_type_sem); |
42 | list_add_tail(&type->list, &bus_type_list); | |
43 | up_write(&bus_type_sem); | |
53540098 | 44 | printk(KERN_INFO PREFIX "bus type %s registered\n", type->name); |
4e10d12a DSL |
45 | return 0; |
46 | } | |
47 | return -ENODEV; | |
48 | } | |
91e4d5a1 | 49 | EXPORT_SYMBOL_GPL(register_acpi_bus_type); |
4e10d12a | 50 | |
4e10d12a DSL |
51 | int unregister_acpi_bus_type(struct acpi_bus_type *type) |
52 | { | |
53 | if (acpi_disabled) | |
54 | return 0; | |
55 | if (type) { | |
56 | down_write(&bus_type_sem); | |
57 | list_del_init(&type->list); | |
58 | up_write(&bus_type_sem); | |
53540098 RW |
59 | printk(KERN_INFO PREFIX "bus type %s unregistered\n", |
60 | type->name); | |
4e10d12a DSL |
61 | return 0; |
62 | } | |
63 | return -ENODEV; | |
64 | } | |
91e4d5a1 | 65 | EXPORT_SYMBOL_GPL(unregister_acpi_bus_type); |
4e10d12a | 66 | |
53540098 | 67 | static struct acpi_bus_type *acpi_get_bus_type(struct device *dev) |
4e10d12a DSL |
68 | { |
69 | struct acpi_bus_type *tmp, *ret = NULL; | |
70 | ||
71 | down_read(&bus_type_sem); | |
72 | list_for_each_entry(tmp, &bus_type_list, list) { | |
53540098 | 73 | if (tmp->match(dev)) { |
4e10d12a DSL |
74 | ret = tmp; |
75 | break; | |
76 | } | |
77 | } | |
78 | up_read(&bus_type_sem); | |
79 | return ret; | |
80 | } | |
81 | ||
11b88ee2 RW |
82 | #define FIND_CHILD_MIN_SCORE 1 |
83 | #define FIND_CHILD_MAX_SCORE 2 | |
84 | ||
d9fef0c4 | 85 | static int find_child_checks(struct acpi_device *adev, bool check_children) |
60f75b8e | 86 | { |
11b88ee2 | 87 | bool sta_present = true; |
60f75b8e RW |
88 | unsigned long long sta; |
89 | acpi_status status; | |
90 | ||
d9fef0c4 | 91 | status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta); |
11b88ee2 RW |
92 | if (status == AE_NOT_FOUND) |
93 | sta_present = false; | |
94 | else if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED)) | |
95 | return -ENODEV; | |
60f75b8e | 96 | |
d9fef0c4 RW |
97 | if (check_children && list_empty(&adev->children)) |
98 | return -ENODEV; | |
60f75b8e | 99 | |
11b88ee2 | 100 | return sta_present ? FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE; |
60f75b8e RW |
101 | } |
102 | ||
d9fef0c4 RW |
103 | struct acpi_device *acpi_find_child_device(struct acpi_device *parent, |
104 | u64 address, bool check_children) | |
60f75b8e | 105 | { |
d9fef0c4 RW |
106 | struct acpi_device *adev, *ret = NULL; |
107 | int ret_score = 0; | |
108 | ||
5ce79d20 RW |
109 | if (!parent) |
110 | return NULL; | |
111 | ||
d9fef0c4 RW |
112 | list_for_each_entry(adev, &parent->children, node) { |
113 | unsigned long long addr; | |
114 | acpi_status status; | |
115 | int score; | |
116 | ||
117 | status = acpi_evaluate_integer(adev->handle, METHOD_NAME__ADR, | |
118 | NULL, &addr); | |
119 | if (ACPI_FAILURE(status) || addr != address) | |
120 | continue; | |
121 | ||
122 | if (!ret) { | |
123 | /* This is the first matching object. Save it. */ | |
124 | ret = adev; | |
125 | continue; | |
126 | } | |
127 | /* | |
128 | * There is more than one matching device object with the same | |
129 | * _ADR value. That really is unexpected, so we are kind of | |
130 | * beyond the scope of the spec here. We have to choose which | |
131 | * one to return, though. | |
132 | * | |
133 | * First, check if the previously found object is good enough | |
134 | * and return it if so. Second, do the same for the object that | |
135 | * we've just found. | |
136 | */ | |
137 | if (!ret_score) { | |
138 | ret_score = find_child_checks(ret, check_children); | |
139 | if (ret_score == FIND_CHILD_MAX_SCORE) | |
140 | return ret; | |
141 | } | |
142 | score = find_child_checks(adev, check_children); | |
143 | if (score == FIND_CHILD_MAX_SCORE) { | |
144 | return adev; | |
145 | } else if (score > ret_score) { | |
146 | ret = adev; | |
147 | ret_score = score; | |
148 | } | |
4e10d12a | 149 | } |
d9fef0c4 | 150 | return ret; |
4e10d12a | 151 | } |
9c5ad36d | 152 | EXPORT_SYMBOL_GPL(acpi_find_child_device); |
4e10d12a | 153 | |
bdbdbf91 RW |
154 | static void acpi_physnode_link_name(char *buf, unsigned int node_id) |
155 | { | |
156 | if (node_id > 0) | |
157 | snprintf(buf, PHYSICAL_NODE_NAME_SIZE, | |
158 | PHYSICAL_NODE_STRING "%u", node_id); | |
159 | else | |
160 | strcpy(buf, PHYSICAL_NODE_STRING); | |
161 | } | |
162 | ||
24dee1fc | 163 | int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev) |
4e10d12a | 164 | { |
f3fd0c8a | 165 | struct acpi_device_physical_node *physical_node, *pn; |
007ccfcf RW |
166 | char physical_node_name[PHYSICAL_NODE_NAME_SIZE]; |
167 | struct list_head *physnode_list; | |
168 | unsigned int node_id; | |
1033f904 | 169 | int retval = -EINVAL; |
4e10d12a | 170 | |
7b199811 | 171 | if (ACPI_COMPANION(dev)) { |
24dee1fc | 172 | if (acpi_dev) { |
7b199811 | 173 | dev_warn(dev, "ACPI companion already set\n"); |
f3fd0c8a RW |
174 | return -EINVAL; |
175 | } else { | |
7b199811 | 176 | acpi_dev = ACPI_COMPANION(dev); |
f3fd0c8a | 177 | } |
4e10d12a | 178 | } |
7b199811 | 179 | if (!acpi_dev) |
f3fd0c8a | 180 | return -EINVAL; |
1033f904 | 181 | |
a104b4d4 | 182 | get_device(&acpi_dev->dev); |
4e10d12a | 183 | get_device(dev); |
f3fd0c8a | 184 | physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL); |
1033f904 LT |
185 | if (!physical_node) { |
186 | retval = -ENOMEM; | |
187 | goto err; | |
4e10d12a | 188 | } |
4e10d12a | 189 | |
1033f904 | 190 | mutex_lock(&acpi_dev->physical_node_lock); |
f3fd0c8a | 191 | |
007ccfcf RW |
192 | /* |
193 | * Keep the list sorted by node_id so that the IDs of removed nodes can | |
194 | * be recycled easily. | |
195 | */ | |
196 | physnode_list = &acpi_dev->physical_node_list; | |
197 | node_id = 0; | |
198 | list_for_each_entry(pn, &acpi_dev->physical_node_list, node) { | |
199 | /* Sanity check. */ | |
f3fd0c8a | 200 | if (pn->dev == dev) { |
3342c753 RW |
201 | mutex_unlock(&acpi_dev->physical_node_lock); |
202 | ||
f3fd0c8a | 203 | dev_warn(dev, "Already associated with ACPI node\n"); |
3342c753 | 204 | kfree(physical_node); |
7b199811 | 205 | if (ACPI_COMPANION(dev) != acpi_dev) |
3342c753 | 206 | goto err; |
3fe444ad | 207 | |
3342c753 | 208 | put_device(dev); |
a104b4d4 | 209 | put_device(&acpi_dev->dev); |
3342c753 | 210 | return 0; |
f3fd0c8a | 211 | } |
007ccfcf RW |
212 | if (pn->node_id == node_id) { |
213 | physnode_list = &pn->node; | |
214 | node_id++; | |
215 | } | |
1071695f DB |
216 | } |
217 | ||
007ccfcf | 218 | physical_node->node_id = node_id; |
1033f904 | 219 | physical_node->dev = dev; |
007ccfcf | 220 | list_add(&physical_node->node, physnode_list); |
1033f904 | 221 | acpi_dev->physical_node_count++; |
f3fd0c8a | 222 | |
7b199811 RW |
223 | if (!ACPI_COMPANION(dev)) |
224 | ACPI_COMPANION_SET(dev, acpi_dev); | |
1033f904 | 225 | |
bdbdbf91 | 226 | acpi_physnode_link_name(physical_node_name, node_id); |
1033f904 | 227 | retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, |
f501b6ec | 228 | physical_node_name); |
464c1147 RW |
229 | if (retval) |
230 | dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n", | |
231 | physical_node_name, retval); | |
232 | ||
1033f904 | 233 | retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj, |
f501b6ec | 234 | "firmware_node"); |
464c1147 RW |
235 | if (retval) |
236 | dev_err(dev, "Failed to create link firmware_node (%d)\n", | |
237 | retval); | |
1033f904 | 238 | |
40055206 RW |
239 | mutex_unlock(&acpi_dev->physical_node_lock); |
240 | ||
1033f904 LT |
241 | if (acpi_dev->wakeup.flags.valid) |
242 | device_set_wakeup_capable(dev, true); | |
243 | ||
4e10d12a | 244 | return 0; |
1033f904 LT |
245 | |
246 | err: | |
7b199811 | 247 | ACPI_COMPANION_SET(dev, NULL); |
1033f904 | 248 | put_device(dev); |
a104b4d4 | 249 | put_device(&acpi_dev->dev); |
1033f904 | 250 | return retval; |
4e10d12a | 251 | } |
ac212b69 | 252 | EXPORT_SYMBOL_GPL(acpi_bind_one); |
4e10d12a | 253 | |
ac212b69 | 254 | int acpi_unbind_one(struct device *dev) |
4e10d12a | 255 | { |
7b199811 | 256 | struct acpi_device *acpi_dev = ACPI_COMPANION(dev); |
1033f904 | 257 | struct acpi_device_physical_node *entry; |
1033f904 | 258 | |
7b199811 | 259 | if (!acpi_dev) |
4e10d12a | 260 | return 0; |
1071695f | 261 | |
1033f904 | 262 | mutex_lock(&acpi_dev->physical_node_lock); |
3e332783 RW |
263 | |
264 | list_for_each_entry(entry, &acpi_dev->physical_node_list, node) | |
265 | if (entry->dev == dev) { | |
266 | char physnode_name[PHYSICAL_NODE_NAME_SIZE]; | |
267 | ||
268 | list_del(&entry->node); | |
269 | acpi_dev->physical_node_count--; | |
270 | ||
271 | acpi_physnode_link_name(physnode_name, entry->node_id); | |
272 | sysfs_remove_link(&acpi_dev->dev.kobj, physnode_name); | |
273 | sysfs_remove_link(&dev->kobj, "firmware_node"); | |
7b199811 | 274 | ACPI_COMPANION_SET(dev, NULL); |
a104b4d4 | 275 | /* Drop references taken by acpi_bind_one(). */ |
3e332783 | 276 | put_device(dev); |
a104b4d4 | 277 | put_device(&acpi_dev->dev); |
3e332783 RW |
278 | kfree(entry); |
279 | break; | |
280 | } | |
281 | ||
1033f904 | 282 | mutex_unlock(&acpi_dev->physical_node_lock); |
4e10d12a DSL |
283 | return 0; |
284 | } | |
ac212b69 | 285 | EXPORT_SYMBOL_GPL(acpi_unbind_one); |
4e10d12a DSL |
286 | |
287 | static int acpi_platform_notify(struct device *dev) | |
288 | { | |
53540098 | 289 | struct acpi_bus_type *type = acpi_get_bus_type(dev); |
11909ca1 | 290 | int ret; |
4e10d12a | 291 | |
f3fd0c8a | 292 | ret = acpi_bind_one(dev, NULL); |
92414481 | 293 | if (ret && type) { |
e3f02c52 RW |
294 | struct acpi_device *adev; |
295 | ||
296 | adev = type->find_companion(dev); | |
297 | if (!adev) { | |
11909ca1 | 298 | DBG("Unable to get handle for %s\n", dev_name(dev)); |
e3f02c52 | 299 | ret = -ENODEV; |
11909ca1 RW |
300 | goto out; |
301 | } | |
24dee1fc | 302 | ret = acpi_bind_one(dev, adev); |
11909ca1 RW |
303 | if (ret) |
304 | goto out; | |
4e10d12a | 305 | } |
11909ca1 RW |
306 | |
307 | if (type && type->setup) | |
308 | type->setup(dev); | |
4e10d12a | 309 | |
f3fd0c8a | 310 | out: |
4e10d12a DSL |
311 | #if ACPI_GLUE_DEBUG |
312 | if (!ret) { | |
313 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
314 | ||
a412a11d | 315 | acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer); |
db1461ad | 316 | DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer); |
02438d87 | 317 | kfree(buffer.pointer); |
4e10d12a | 318 | } else |
db1461ad | 319 | DBG("Device %s -> No ACPI support\n", dev_name(dev)); |
4e10d12a DSL |
320 | #endif |
321 | ||
322 | return ret; | |
323 | } | |
324 | ||
325 | static int acpi_platform_notify_remove(struct device *dev) | |
326 | { | |
11909ca1 RW |
327 | struct acpi_bus_type *type; |
328 | ||
53540098 | 329 | type = acpi_get_bus_type(dev); |
11909ca1 RW |
330 | if (type && type->cleanup) |
331 | type->cleanup(dev); | |
332 | ||
4e10d12a DSL |
333 | acpi_unbind_one(dev); |
334 | return 0; | |
335 | } | |
336 | ||
0e46517d | 337 | int __init init_acpi_device_notify(void) |
4e10d12a | 338 | { |
4e10d12a DSL |
339 | if (platform_notify || platform_notify_remove) { |
340 | printk(KERN_ERR PREFIX "Can't use platform_notify\n"); | |
341 | return 0; | |
342 | } | |
343 | platform_notify = acpi_platform_notify; | |
344 | platform_notify_remove = acpi_platform_notify_remove; | |
345 | return 0; | |
346 | } |