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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; | |
53540098 | 40 | if (type && type->match && type->find_device) { |
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 | ||
60f75b8e RW |
82 | static acpi_status acpi_dev_present(acpi_handle handle, u32 lvl_not_used, |
83 | void *not_used, void **ret_p) | |
4e10d12a | 84 | { |
60f75b8e RW |
85 | struct acpi_device *adev = NULL; |
86 | ||
87 | acpi_bus_get_device(handle, &adev); | |
88 | if (adev) { | |
89 | *ret_p = handle; | |
90 | return AE_CTRL_TERMINATE; | |
91 | } | |
92 | return AE_OK; | |
93 | } | |
94 | ||
95 | static bool acpi_extra_checks_passed(acpi_handle handle, bool is_bridge) | |
96 | { | |
97 | unsigned long long sta; | |
98 | acpi_status status; | |
99 | ||
100 | status = acpi_bus_get_status_handle(handle, &sta); | |
101 | if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED)) | |
102 | return false; | |
103 | ||
104 | if (is_bridge) { | |
105 | void *test = NULL; | |
106 | ||
107 | /* Check if this object has at least one child device. */ | |
108 | acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, | |
109 | acpi_dev_present, NULL, NULL, &test); | |
110 | return !!test; | |
111 | } | |
112 | return true; | |
113 | } | |
114 | ||
115 | struct find_child_context { | |
116 | u64 addr; | |
117 | bool is_bridge; | |
118 | acpi_handle ret; | |
119 | bool ret_checked; | |
120 | }; | |
121 | ||
122 | static acpi_status do_find_child(acpi_handle handle, u32 lvl_not_used, | |
123 | void *data, void **not_used) | |
124 | { | |
125 | struct find_child_context *context = data; | |
126 | unsigned long long addr; | |
4e10d12a | 127 | acpi_status status; |
33f767d7 RW |
128 | |
129 | status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &addr); | |
60f75b8e RW |
130 | if (ACPI_FAILURE(status) || addr != context->addr) |
131 | return AE_OK; | |
132 | ||
133 | if (!context->ret) { | |
134 | /* This is the first matching object. Save its handle. */ | |
135 | context->ret = handle; | |
136 | return AE_OK; | |
137 | } | |
138 | /* | |
139 | * There is more than one matching object with the same _ADR value. | |
140 | * That really is unexpected, so we are kind of beyond the scope of the | |
141 | * spec here. We have to choose which one to return, though. | |
142 | * | |
143 | * First, check if the previously found object is good enough and return | |
144 | * its handle if so. Second, check the same for the object that we've | |
145 | * just found. | |
146 | */ | |
147 | if (!context->ret_checked) { | |
148 | if (acpi_extra_checks_passed(context->ret, context->is_bridge)) | |
c7d9ca90 | 149 | return AE_CTRL_TERMINATE; |
60f75b8e RW |
150 | else |
151 | context->ret_checked = true; | |
152 | } | |
153 | if (acpi_extra_checks_passed(handle, context->is_bridge)) { | |
154 | context->ret = handle; | |
155 | return AE_CTRL_TERMINATE; | |
4e10d12a DSL |
156 | } |
157 | return AE_OK; | |
158 | } | |
159 | ||
60f75b8e | 160 | acpi_handle acpi_find_child(acpi_handle parent, u64 addr, bool is_bridge) |
4e10d12a | 161 | { |
60f75b8e RW |
162 | if (parent) { |
163 | struct find_child_context context = { | |
164 | .addr = addr, | |
165 | .is_bridge = is_bridge, | |
166 | }; | |
4e10d12a | 167 | |
60f75b8e RW |
168 | acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, 1, do_find_child, |
169 | NULL, &context, NULL); | |
170 | return context.ret; | |
171 | } | |
172 | return NULL; | |
33f767d7 | 173 | } |
60f75b8e | 174 | EXPORT_SYMBOL_GPL(acpi_find_child); |
4e10d12a | 175 | |
bdbdbf91 RW |
176 | static void acpi_physnode_link_name(char *buf, unsigned int node_id) |
177 | { | |
178 | if (node_id > 0) | |
179 | snprintf(buf, PHYSICAL_NODE_NAME_SIZE, | |
180 | PHYSICAL_NODE_STRING "%u", node_id); | |
181 | else | |
182 | strcpy(buf, PHYSICAL_NODE_STRING); | |
183 | } | |
184 | ||
ac212b69 | 185 | int acpi_bind_one(struct device *dev, acpi_handle handle) |
4e10d12a | 186 | { |
1071695f | 187 | struct acpi_device *acpi_dev; |
4e10d12a | 188 | acpi_status status; |
f3fd0c8a | 189 | struct acpi_device_physical_node *physical_node, *pn; |
007ccfcf RW |
190 | char physical_node_name[PHYSICAL_NODE_NAME_SIZE]; |
191 | struct list_head *physnode_list; | |
192 | unsigned int node_id; | |
1033f904 | 193 | int retval = -EINVAL; |
4e10d12a | 194 | |
95f8a082 | 195 | if (ACPI_HANDLE(dev)) { |
f3fd0c8a RW |
196 | if (handle) { |
197 | dev_warn(dev, "ACPI handle is already set\n"); | |
198 | return -EINVAL; | |
199 | } else { | |
95f8a082 | 200 | handle = ACPI_HANDLE(dev); |
f3fd0c8a | 201 | } |
4e10d12a | 202 | } |
f3fd0c8a RW |
203 | if (!handle) |
204 | return -EINVAL; | |
1033f904 | 205 | |
4e10d12a | 206 | get_device(dev); |
1033f904 LT |
207 | status = acpi_bus_get_device(handle, &acpi_dev); |
208 | if (ACPI_FAILURE(status)) | |
209 | goto err; | |
210 | ||
f3fd0c8a | 211 | physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL); |
1033f904 LT |
212 | if (!physical_node) { |
213 | retval = -ENOMEM; | |
214 | goto err; | |
4e10d12a | 215 | } |
4e10d12a | 216 | |
1033f904 | 217 | mutex_lock(&acpi_dev->physical_node_lock); |
f3fd0c8a | 218 | |
007ccfcf RW |
219 | /* |
220 | * Keep the list sorted by node_id so that the IDs of removed nodes can | |
221 | * be recycled easily. | |
222 | */ | |
223 | physnode_list = &acpi_dev->physical_node_list; | |
224 | node_id = 0; | |
225 | list_for_each_entry(pn, &acpi_dev->physical_node_list, node) { | |
226 | /* Sanity check. */ | |
f3fd0c8a RW |
227 | if (pn->dev == dev) { |
228 | dev_warn(dev, "Already associated with ACPI node\n"); | |
3fe444ad RW |
229 | if (ACPI_HANDLE(dev) == handle) |
230 | retval = 0; | |
231 | ||
232 | goto out_free; | |
f3fd0c8a | 233 | } |
007ccfcf RW |
234 | if (pn->node_id == node_id) { |
235 | physnode_list = &pn->node; | |
236 | node_id++; | |
237 | } | |
1071695f DB |
238 | } |
239 | ||
007ccfcf | 240 | physical_node->node_id = node_id; |
1033f904 | 241 | physical_node->dev = dev; |
007ccfcf | 242 | list_add(&physical_node->node, physnode_list); |
1033f904 | 243 | acpi_dev->physical_node_count++; |
f3fd0c8a | 244 | |
95f8a082 RW |
245 | if (!ACPI_HANDLE(dev)) |
246 | ACPI_HANDLE_SET(dev, acpi_dev->handle); | |
1033f904 | 247 | |
bdbdbf91 | 248 | acpi_physnode_link_name(physical_node_name, node_id); |
1033f904 | 249 | retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, |
f501b6ec | 250 | physical_node_name); |
1033f904 | 251 | retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj, |
f501b6ec | 252 | "firmware_node"); |
1033f904 | 253 | |
40055206 RW |
254 | mutex_unlock(&acpi_dev->physical_node_lock); |
255 | ||
1033f904 LT |
256 | if (acpi_dev->wakeup.flags.valid) |
257 | device_set_wakeup_capable(dev, true); | |
258 | ||
4e10d12a | 259 | return 0; |
1033f904 LT |
260 | |
261 | err: | |
95f8a082 | 262 | ACPI_HANDLE_SET(dev, NULL); |
1033f904 LT |
263 | put_device(dev); |
264 | return retval; | |
f3fd0c8a | 265 | |
3fe444ad | 266 | out_free: |
f3fd0c8a RW |
267 | mutex_unlock(&acpi_dev->physical_node_lock); |
268 | kfree(physical_node); | |
3fe444ad RW |
269 | if (retval) |
270 | goto err; | |
271 | ||
272 | put_device(dev); | |
273 | return 0; | |
4e10d12a | 274 | } |
ac212b69 | 275 | EXPORT_SYMBOL_GPL(acpi_bind_one); |
4e10d12a | 276 | |
ac212b69 | 277 | int acpi_unbind_one(struct device *dev) |
4e10d12a | 278 | { |
1033f904 LT |
279 | struct acpi_device_physical_node *entry; |
280 | struct acpi_device *acpi_dev; | |
281 | acpi_status status; | |
282 | struct list_head *node, *next; | |
283 | ||
95f8a082 | 284 | if (!ACPI_HANDLE(dev)) |
4e10d12a | 285 | return 0; |
1071695f | 286 | |
95f8a082 | 287 | status = acpi_bus_get_device(ACPI_HANDLE(dev), &acpi_dev); |
1033f904 LT |
288 | if (ACPI_FAILURE(status)) |
289 | goto err; | |
1071695f | 290 | |
1033f904 LT |
291 | mutex_lock(&acpi_dev->physical_node_lock); |
292 | list_for_each_safe(node, next, &acpi_dev->physical_node_list) { | |
007ccfcf | 293 | char physical_node_name[PHYSICAL_NODE_NAME_SIZE]; |
1033f904 LT |
294 | |
295 | entry = list_entry(node, struct acpi_device_physical_node, | |
f501b6ec | 296 | node); |
1033f904 LT |
297 | if (entry->dev != dev) |
298 | continue; | |
299 | ||
300 | list_del(node); | |
1033f904 LT |
301 | acpi_dev->physical_node_count--; |
302 | ||
bdbdbf91 | 303 | acpi_physnode_link_name(physical_node_name, entry->node_id); |
1033f904 LT |
304 | sysfs_remove_link(&acpi_dev->dev.kobj, physical_node_name); |
305 | sysfs_remove_link(&dev->kobj, "firmware_node"); | |
95f8a082 | 306 | ACPI_HANDLE_SET(dev, NULL); |
4e10d12a DSL |
307 | /* acpi_bind_one increase refcnt by one */ |
308 | put_device(dev); | |
1033f904 | 309 | kfree(entry); |
4e10d12a | 310 | } |
1033f904 LT |
311 | mutex_unlock(&acpi_dev->physical_node_lock); |
312 | ||
4e10d12a | 313 | return 0; |
1033f904 LT |
314 | |
315 | err: | |
316 | dev_err(dev, "Oops, 'acpi_handle' corrupt\n"); | |
317 | return -EINVAL; | |
4e10d12a | 318 | } |
ac212b69 | 319 | EXPORT_SYMBOL_GPL(acpi_unbind_one); |
4e10d12a DSL |
320 | |
321 | static int acpi_platform_notify(struct device *dev) | |
322 | { | |
53540098 | 323 | struct acpi_bus_type *type = acpi_get_bus_type(dev); |
4e10d12a | 324 | acpi_handle handle; |
11909ca1 | 325 | int ret; |
4e10d12a | 326 | |
f3fd0c8a | 327 | ret = acpi_bind_one(dev, NULL); |
92414481 | 328 | if (ret && type) { |
11909ca1 RW |
329 | ret = type->find_device(dev, &handle); |
330 | if (ret) { | |
331 | DBG("Unable to get handle for %s\n", dev_name(dev)); | |
332 | goto out; | |
333 | } | |
334 | ret = acpi_bind_one(dev, handle); | |
335 | if (ret) | |
336 | goto out; | |
4e10d12a | 337 | } |
11909ca1 RW |
338 | |
339 | if (type && type->setup) | |
340 | type->setup(dev); | |
4e10d12a | 341 | |
f3fd0c8a | 342 | out: |
4e10d12a DSL |
343 | #if ACPI_GLUE_DEBUG |
344 | if (!ret) { | |
345 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
346 | ||
a412a11d | 347 | acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer); |
db1461ad | 348 | DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer); |
02438d87 | 349 | kfree(buffer.pointer); |
4e10d12a | 350 | } else |
db1461ad | 351 | DBG("Device %s -> No ACPI support\n", dev_name(dev)); |
4e10d12a DSL |
352 | #endif |
353 | ||
354 | return ret; | |
355 | } | |
356 | ||
357 | static int acpi_platform_notify_remove(struct device *dev) | |
358 | { | |
11909ca1 RW |
359 | struct acpi_bus_type *type; |
360 | ||
53540098 | 361 | type = acpi_get_bus_type(dev); |
11909ca1 RW |
362 | if (type && type->cleanup) |
363 | type->cleanup(dev); | |
364 | ||
4e10d12a DSL |
365 | acpi_unbind_one(dev); |
366 | return 0; | |
367 | } | |
368 | ||
0e46517d | 369 | int __init init_acpi_device_notify(void) |
4e10d12a | 370 | { |
4e10d12a DSL |
371 | if (platform_notify || platform_notify_remove) { |
372 | printk(KERN_ERR PREFIX "Can't use platform_notify\n"); | |
373 | return 0; | |
374 | } | |
375 | platform_notify = acpi_platform_notify; | |
376 | platform_notify_remove = acpi_platform_notify_remove; | |
377 | return 0; | |
378 | } |