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 | |
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 | ||
11b88ee2 RW |
82 | #define FIND_CHILD_MIN_SCORE 1 |
83 | #define FIND_CHILD_MAX_SCORE 2 | |
84 | ||
60f75b8e RW |
85 | static acpi_status acpi_dev_present(acpi_handle handle, u32 lvl_not_used, |
86 | void *not_used, void **ret_p) | |
4e10d12a | 87 | { |
60f75b8e RW |
88 | struct acpi_device *adev = NULL; |
89 | ||
90 | acpi_bus_get_device(handle, &adev); | |
91 | if (adev) { | |
92 | *ret_p = handle; | |
93 | return AE_CTRL_TERMINATE; | |
94 | } | |
95 | return AE_OK; | |
96 | } | |
97 | ||
11b88ee2 | 98 | static int do_find_child_checks(acpi_handle handle, bool is_bridge) |
60f75b8e | 99 | { |
11b88ee2 | 100 | bool sta_present = true; |
60f75b8e RW |
101 | unsigned long long sta; |
102 | acpi_status status; | |
103 | ||
11b88ee2 RW |
104 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); |
105 | if (status == AE_NOT_FOUND) | |
106 | sta_present = false; | |
107 | else if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED)) | |
108 | return -ENODEV; | |
60f75b8e RW |
109 | |
110 | if (is_bridge) { | |
111 | void *test = NULL; | |
112 | ||
113 | /* Check if this object has at least one child device. */ | |
114 | acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, | |
115 | acpi_dev_present, NULL, NULL, &test); | |
11b88ee2 RW |
116 | if (!test) |
117 | return -ENODEV; | |
60f75b8e | 118 | } |
11b88ee2 | 119 | return sta_present ? FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE; |
60f75b8e RW |
120 | } |
121 | ||
122 | struct find_child_context { | |
123 | u64 addr; | |
124 | bool is_bridge; | |
125 | acpi_handle ret; | |
11b88ee2 | 126 | int ret_score; |
60f75b8e RW |
127 | }; |
128 | ||
129 | static acpi_status do_find_child(acpi_handle handle, u32 lvl_not_used, | |
130 | void *data, void **not_used) | |
131 | { | |
132 | struct find_child_context *context = data; | |
133 | unsigned long long addr; | |
4e10d12a | 134 | acpi_status status; |
11b88ee2 | 135 | int score; |
33f767d7 RW |
136 | |
137 | status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &addr); | |
60f75b8e RW |
138 | if (ACPI_FAILURE(status) || addr != context->addr) |
139 | return AE_OK; | |
140 | ||
141 | if (!context->ret) { | |
142 | /* This is the first matching object. Save its handle. */ | |
143 | context->ret = handle; | |
144 | return AE_OK; | |
145 | } | |
146 | /* | |
147 | * There is more than one matching object with the same _ADR value. | |
148 | * That really is unexpected, so we are kind of beyond the scope of the | |
149 | * spec here. We have to choose which one to return, though. | |
150 | * | |
151 | * First, check if the previously found object is good enough and return | |
152 | * its handle if so. Second, check the same for the object that we've | |
153 | * just found. | |
154 | */ | |
11b88ee2 RW |
155 | if (!context->ret_score) { |
156 | score = do_find_child_checks(context->ret, context->is_bridge); | |
157 | if (score == FIND_CHILD_MAX_SCORE) | |
c7d9ca90 | 158 | return AE_CTRL_TERMINATE; |
60f75b8e | 159 | else |
11b88ee2 | 160 | context->ret_score = score; |
60f75b8e | 161 | } |
11b88ee2 RW |
162 | score = do_find_child_checks(handle, context->is_bridge); |
163 | if (score == FIND_CHILD_MAX_SCORE) { | |
60f75b8e RW |
164 | context->ret = handle; |
165 | return AE_CTRL_TERMINATE; | |
11b88ee2 RW |
166 | } else if (score > context->ret_score) { |
167 | context->ret = handle; | |
168 | context->ret_score = score; | |
4e10d12a DSL |
169 | } |
170 | return AE_OK; | |
171 | } | |
172 | ||
60f75b8e | 173 | acpi_handle acpi_find_child(acpi_handle parent, u64 addr, bool is_bridge) |
4e10d12a | 174 | { |
60f75b8e RW |
175 | if (parent) { |
176 | struct find_child_context context = { | |
177 | .addr = addr, | |
178 | .is_bridge = is_bridge, | |
179 | }; | |
4e10d12a | 180 | |
60f75b8e RW |
181 | acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, 1, do_find_child, |
182 | NULL, &context, NULL); | |
183 | return context.ret; | |
184 | } | |
185 | return NULL; | |
33f767d7 | 186 | } |
60f75b8e | 187 | EXPORT_SYMBOL_GPL(acpi_find_child); |
4e10d12a | 188 | |
bdbdbf91 RW |
189 | static void acpi_physnode_link_name(char *buf, unsigned int node_id) |
190 | { | |
191 | if (node_id > 0) | |
192 | snprintf(buf, PHYSICAL_NODE_NAME_SIZE, | |
193 | PHYSICAL_NODE_STRING "%u", node_id); | |
194 | else | |
195 | strcpy(buf, PHYSICAL_NODE_STRING); | |
196 | } | |
197 | ||
ac212b69 | 198 | int acpi_bind_one(struct device *dev, acpi_handle handle) |
4e10d12a | 199 | { |
1071695f | 200 | struct acpi_device *acpi_dev; |
4e10d12a | 201 | acpi_status status; |
f3fd0c8a | 202 | struct acpi_device_physical_node *physical_node, *pn; |
007ccfcf RW |
203 | char physical_node_name[PHYSICAL_NODE_NAME_SIZE]; |
204 | struct list_head *physnode_list; | |
205 | unsigned int node_id; | |
1033f904 | 206 | int retval = -EINVAL; |
4e10d12a | 207 | |
95f8a082 | 208 | if (ACPI_HANDLE(dev)) { |
f3fd0c8a RW |
209 | if (handle) { |
210 | dev_warn(dev, "ACPI handle is already set\n"); | |
211 | return -EINVAL; | |
212 | } else { | |
95f8a082 | 213 | handle = ACPI_HANDLE(dev); |
f3fd0c8a | 214 | } |
4e10d12a | 215 | } |
f3fd0c8a RW |
216 | if (!handle) |
217 | return -EINVAL; | |
1033f904 | 218 | |
4e10d12a | 219 | get_device(dev); |
1033f904 LT |
220 | status = acpi_bus_get_device(handle, &acpi_dev); |
221 | if (ACPI_FAILURE(status)) | |
222 | goto err; | |
223 | ||
f3fd0c8a | 224 | physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL); |
1033f904 LT |
225 | if (!physical_node) { |
226 | retval = -ENOMEM; | |
227 | goto err; | |
4e10d12a | 228 | } |
4e10d12a | 229 | |
1033f904 | 230 | mutex_lock(&acpi_dev->physical_node_lock); |
f3fd0c8a | 231 | |
007ccfcf RW |
232 | /* |
233 | * Keep the list sorted by node_id so that the IDs of removed nodes can | |
234 | * be recycled easily. | |
235 | */ | |
236 | physnode_list = &acpi_dev->physical_node_list; | |
237 | node_id = 0; | |
238 | list_for_each_entry(pn, &acpi_dev->physical_node_list, node) { | |
239 | /* Sanity check. */ | |
f3fd0c8a | 240 | if (pn->dev == dev) { |
3342c753 RW |
241 | mutex_unlock(&acpi_dev->physical_node_lock); |
242 | ||
f3fd0c8a | 243 | dev_warn(dev, "Already associated with ACPI node\n"); |
3342c753 RW |
244 | kfree(physical_node); |
245 | if (ACPI_HANDLE(dev) != handle) | |
246 | goto err; | |
3fe444ad | 247 | |
3342c753 RW |
248 | put_device(dev); |
249 | return 0; | |
f3fd0c8a | 250 | } |
007ccfcf RW |
251 | if (pn->node_id == node_id) { |
252 | physnode_list = &pn->node; | |
253 | node_id++; | |
254 | } | |
1071695f DB |
255 | } |
256 | ||
007ccfcf | 257 | physical_node->node_id = node_id; |
1033f904 | 258 | physical_node->dev = dev; |
007ccfcf | 259 | list_add(&physical_node->node, physnode_list); |
1033f904 | 260 | acpi_dev->physical_node_count++; |
f3fd0c8a | 261 | |
95f8a082 RW |
262 | if (!ACPI_HANDLE(dev)) |
263 | ACPI_HANDLE_SET(dev, acpi_dev->handle); | |
1033f904 | 264 | |
bdbdbf91 | 265 | acpi_physnode_link_name(physical_node_name, node_id); |
1033f904 | 266 | retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, |
f501b6ec | 267 | physical_node_name); |
464c1147 RW |
268 | if (retval) |
269 | dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n", | |
270 | physical_node_name, retval); | |
271 | ||
1033f904 | 272 | retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj, |
f501b6ec | 273 | "firmware_node"); |
464c1147 RW |
274 | if (retval) |
275 | dev_err(dev, "Failed to create link firmware_node (%d)\n", | |
276 | retval); | |
1033f904 | 277 | |
40055206 RW |
278 | mutex_unlock(&acpi_dev->physical_node_lock); |
279 | ||
1033f904 LT |
280 | if (acpi_dev->wakeup.flags.valid) |
281 | device_set_wakeup_capable(dev, true); | |
282 | ||
4e10d12a | 283 | return 0; |
1033f904 LT |
284 | |
285 | err: | |
95f8a082 | 286 | ACPI_HANDLE_SET(dev, NULL); |
1033f904 LT |
287 | put_device(dev); |
288 | return retval; | |
4e10d12a | 289 | } |
ac212b69 | 290 | EXPORT_SYMBOL_GPL(acpi_bind_one); |
4e10d12a | 291 | |
ac212b69 | 292 | int acpi_unbind_one(struct device *dev) |
4e10d12a | 293 | { |
1033f904 LT |
294 | struct acpi_device_physical_node *entry; |
295 | struct acpi_device *acpi_dev; | |
296 | acpi_status status; | |
1033f904 | 297 | |
95f8a082 | 298 | if (!ACPI_HANDLE(dev)) |
4e10d12a | 299 | return 0; |
1071695f | 300 | |
95f8a082 | 301 | status = acpi_bus_get_device(ACPI_HANDLE(dev), &acpi_dev); |
38e88839 RW |
302 | if (ACPI_FAILURE(status)) { |
303 | dev_err(dev, "Oops, ACPI handle corrupt in %s()\n", __func__); | |
304 | return -EINVAL; | |
305 | } | |
1071695f | 306 | |
1033f904 | 307 | mutex_lock(&acpi_dev->physical_node_lock); |
3e332783 RW |
308 | |
309 | list_for_each_entry(entry, &acpi_dev->physical_node_list, node) | |
310 | if (entry->dev == dev) { | |
311 | char physnode_name[PHYSICAL_NODE_NAME_SIZE]; | |
312 | ||
313 | list_del(&entry->node); | |
314 | acpi_dev->physical_node_count--; | |
315 | ||
316 | acpi_physnode_link_name(physnode_name, entry->node_id); | |
317 | sysfs_remove_link(&acpi_dev->dev.kobj, physnode_name); | |
318 | sysfs_remove_link(&dev->kobj, "firmware_node"); | |
319 | ACPI_HANDLE_SET(dev, NULL); | |
320 | /* acpi_bind_one() increase refcnt by one. */ | |
321 | put_device(dev); | |
322 | kfree(entry); | |
323 | break; | |
324 | } | |
325 | ||
1033f904 | 326 | mutex_unlock(&acpi_dev->physical_node_lock); |
4e10d12a DSL |
327 | return 0; |
328 | } | |
ac212b69 | 329 | EXPORT_SYMBOL_GPL(acpi_unbind_one); |
4e10d12a DSL |
330 | |
331 | static int acpi_platform_notify(struct device *dev) | |
332 | { | |
53540098 | 333 | struct acpi_bus_type *type = acpi_get_bus_type(dev); |
4e10d12a | 334 | acpi_handle handle; |
11909ca1 | 335 | int ret; |
4e10d12a | 336 | |
f3fd0c8a | 337 | ret = acpi_bind_one(dev, NULL); |
92414481 | 338 | if (ret && type) { |
11909ca1 RW |
339 | ret = type->find_device(dev, &handle); |
340 | if (ret) { | |
341 | DBG("Unable to get handle for %s\n", dev_name(dev)); | |
342 | goto out; | |
343 | } | |
344 | ret = acpi_bind_one(dev, handle); | |
345 | if (ret) | |
346 | goto out; | |
4e10d12a | 347 | } |
11909ca1 RW |
348 | |
349 | if (type && type->setup) | |
350 | type->setup(dev); | |
4e10d12a | 351 | |
f3fd0c8a | 352 | out: |
4e10d12a DSL |
353 | #if ACPI_GLUE_DEBUG |
354 | if (!ret) { | |
355 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
356 | ||
a412a11d | 357 | acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer); |
db1461ad | 358 | DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer); |
02438d87 | 359 | kfree(buffer.pointer); |
4e10d12a | 360 | } else |
db1461ad | 361 | DBG("Device %s -> No ACPI support\n", dev_name(dev)); |
4e10d12a DSL |
362 | #endif |
363 | ||
364 | return ret; | |
365 | } | |
366 | ||
367 | static int acpi_platform_notify_remove(struct device *dev) | |
368 | { | |
11909ca1 RW |
369 | struct acpi_bus_type *type; |
370 | ||
53540098 | 371 | type = acpi_get_bus_type(dev); |
11909ca1 RW |
372 | if (type && type->cleanup) |
373 | type->cleanup(dev); | |
374 | ||
4e10d12a DSL |
375 | acpi_unbind_one(dev); |
376 | return 0; | |
377 | } | |
378 | ||
0e46517d | 379 | int __init init_acpi_device_notify(void) |
4e10d12a | 380 | { |
4e10d12a DSL |
381 | if (platform_notify || platform_notify_remove) { |
382 | printk(KERN_ERR PREFIX "Can't use platform_notify\n"); | |
383 | return 0; | |
384 | } | |
385 | platform_notify = acpi_platform_notify; | |
386 | platform_notify_remove = acpi_platform_notify_remove; | |
387 | return 0; | |
388 | } |