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 LT |
33 | #define PHYSICAL_NODE_STRING "physical_node" |
34 | ||
4e10d12a DSL |
35 | int register_acpi_bus_type(struct acpi_bus_type *type) |
36 | { | |
37 | if (acpi_disabled) | |
38 | return -ENODEV; | |
53540098 | 39 | if (type && type->match && type->find_device) { |
4e10d12a DSL |
40 | down_write(&bus_type_sem); |
41 | list_add_tail(&type->list, &bus_type_list); | |
42 | up_write(&bus_type_sem); | |
53540098 | 43 | printk(KERN_INFO PREFIX "bus type %s registered\n", type->name); |
4e10d12a DSL |
44 | return 0; |
45 | } | |
46 | return -ENODEV; | |
47 | } | |
91e4d5a1 | 48 | EXPORT_SYMBOL_GPL(register_acpi_bus_type); |
4e10d12a | 49 | |
4e10d12a DSL |
50 | int unregister_acpi_bus_type(struct acpi_bus_type *type) |
51 | { | |
52 | if (acpi_disabled) | |
53 | return 0; | |
54 | if (type) { | |
55 | down_write(&bus_type_sem); | |
56 | list_del_init(&type->list); | |
57 | up_write(&bus_type_sem); | |
53540098 RW |
58 | printk(KERN_INFO PREFIX "bus type %s unregistered\n", |
59 | type->name); | |
4e10d12a DSL |
60 | return 0; |
61 | } | |
62 | return -ENODEV; | |
63 | } | |
91e4d5a1 | 64 | EXPORT_SYMBOL_GPL(unregister_acpi_bus_type); |
4e10d12a | 65 | |
53540098 | 66 | static struct acpi_bus_type *acpi_get_bus_type(struct device *dev) |
4e10d12a DSL |
67 | { |
68 | struct acpi_bus_type *tmp, *ret = NULL; | |
69 | ||
70 | down_read(&bus_type_sem); | |
71 | list_for_each_entry(tmp, &bus_type_list, list) { | |
53540098 | 72 | if (tmp->match(dev)) { |
4e10d12a DSL |
73 | ret = tmp; |
74 | break; | |
75 | } | |
76 | } | |
77 | up_read(&bus_type_sem); | |
78 | return ret; | |
79 | } | |
80 | ||
6e4fdb80 RW |
81 | static acpi_status acpi_dev_present(acpi_handle handle, u32 lvl_not_used, |
82 | void *not_used, void **ret_p) | |
4e10d12a | 83 | { |
6e4fdb80 RW |
84 | struct acpi_device *adev = NULL; |
85 | ||
86 | acpi_bus_get_device(handle, &adev); | |
87 | if (adev) { | |
88 | *ret_p = handle; | |
89 | return AE_CTRL_TERMINATE; | |
90 | } | |
91 | return AE_OK; | |
92 | } | |
93 | ||
94 | static bool acpi_extra_checks_passed(acpi_handle handle, bool is_bridge) | |
95 | { | |
96 | unsigned long long sta; | |
97 | acpi_status status; | |
98 | ||
99 | status = acpi_bus_get_status_handle(handle, &sta); | |
100 | if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED)) | |
101 | return false; | |
102 | ||
103 | if (is_bridge) { | |
104 | void *test = NULL; | |
105 | ||
106 | /* Check if this object has at least one child device. */ | |
107 | acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1, | |
108 | acpi_dev_present, NULL, NULL, &test); | |
109 | return !!test; | |
110 | } | |
111 | return true; | |
112 | } | |
113 | ||
114 | struct find_child_context { | |
115 | u64 addr; | |
116 | bool is_bridge; | |
117 | acpi_handle ret; | |
118 | bool ret_checked; | |
119 | }; | |
120 | ||
121 | static acpi_status do_find_child(acpi_handle handle, u32 lvl_not_used, | |
122 | void *data, void **not_used) | |
123 | { | |
124 | struct find_child_context *context = data; | |
125 | unsigned long long addr; | |
4e10d12a | 126 | acpi_status status; |
33f767d7 RW |
127 | |
128 | status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &addr); | |
6e4fdb80 RW |
129 | if (ACPI_FAILURE(status) || addr != context->addr) |
130 | return AE_OK; | |
131 | ||
132 | if (!context->ret) { | |
133 | /* This is the first matching object. Save its handle. */ | |
134 | context->ret = handle; | |
135 | return AE_OK; | |
136 | } | |
137 | /* | |
138 | * There is more than one matching object with the same _ADR value. | |
139 | * That really is unexpected, so we are kind of beyond the scope of the | |
140 | * spec here. We have to choose which one to return, though. | |
141 | * | |
142 | * First, check if the previously found object is good enough and return | |
143 | * its handle if so. Second, check the same for the object that we've | |
144 | * just found. | |
145 | */ | |
146 | if (!context->ret_checked) { | |
147 | if (acpi_extra_checks_passed(context->ret, context->is_bridge)) | |
2ac3b5e4 | 148 | return AE_CTRL_TERMINATE; |
6e4fdb80 RW |
149 | else |
150 | context->ret_checked = true; | |
151 | } | |
152 | if (acpi_extra_checks_passed(handle, context->is_bridge)) { | |
153 | context->ret = handle; | |
154 | return AE_CTRL_TERMINATE; | |
4e10d12a DSL |
155 | } |
156 | return AE_OK; | |
157 | } | |
158 | ||
6e4fdb80 | 159 | acpi_handle acpi_find_child(acpi_handle parent, u64 addr, bool is_bridge) |
4e10d12a | 160 | { |
6e4fdb80 RW |
161 | if (parent) { |
162 | struct find_child_context context = { | |
163 | .addr = addr, | |
164 | .is_bridge = is_bridge, | |
165 | }; | |
4e10d12a | 166 | |
6e4fdb80 RW |
167 | acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, 1, do_find_child, |
168 | NULL, &context, NULL); | |
169 | return context.ret; | |
170 | } | |
171 | return NULL; | |
33f767d7 | 172 | } |
6e4fdb80 | 173 | EXPORT_SYMBOL_GPL(acpi_find_child); |
4e10d12a | 174 | |
4e10d12a DSL |
175 | static int acpi_bind_one(struct device *dev, acpi_handle handle) |
176 | { | |
1071695f | 177 | struct acpi_device *acpi_dev; |
4e10d12a | 178 | acpi_status status; |
f3fd0c8a | 179 | struct acpi_device_physical_node *physical_node, *pn; |
1033f904 LT |
180 | char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2]; |
181 | int retval = -EINVAL; | |
4e10d12a | 182 | |
95f8a082 | 183 | if (ACPI_HANDLE(dev)) { |
f3fd0c8a RW |
184 | if (handle) { |
185 | dev_warn(dev, "ACPI handle is already set\n"); | |
186 | return -EINVAL; | |
187 | } else { | |
95f8a082 | 188 | handle = ACPI_HANDLE(dev); |
f3fd0c8a | 189 | } |
4e10d12a | 190 | } |
f3fd0c8a RW |
191 | if (!handle) |
192 | return -EINVAL; | |
1033f904 | 193 | |
4e10d12a | 194 | get_device(dev); |
1033f904 LT |
195 | status = acpi_bus_get_device(handle, &acpi_dev); |
196 | if (ACPI_FAILURE(status)) | |
197 | goto err; | |
198 | ||
f3fd0c8a | 199 | physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL); |
1033f904 LT |
200 | if (!physical_node) { |
201 | retval = -ENOMEM; | |
202 | goto err; | |
4e10d12a | 203 | } |
4e10d12a | 204 | |
1033f904 | 205 | mutex_lock(&acpi_dev->physical_node_lock); |
f3fd0c8a RW |
206 | |
207 | /* Sanity check. */ | |
208 | list_for_each_entry(pn, &acpi_dev->physical_node_list, node) | |
209 | if (pn->dev == dev) { | |
210 | dev_warn(dev, "Already associated with ACPI node\n"); | |
211 | goto err_free; | |
212 | } | |
213 | ||
1033f904 LT |
214 | /* allocate physical node id according to physical_node_id_bitmap */ |
215 | physical_node->node_id = | |
216 | find_first_zero_bit(acpi_dev->physical_node_id_bitmap, | |
217 | ACPI_MAX_PHYSICAL_NODE); | |
218 | if (physical_node->node_id >= ACPI_MAX_PHYSICAL_NODE) { | |
219 | retval = -ENOSPC; | |
f3fd0c8a | 220 | goto err_free; |
1071695f DB |
221 | } |
222 | ||
1033f904 LT |
223 | set_bit(physical_node->node_id, acpi_dev->physical_node_id_bitmap); |
224 | physical_node->dev = dev; | |
225 | list_add_tail(&physical_node->node, &acpi_dev->physical_node_list); | |
226 | acpi_dev->physical_node_count++; | |
f3fd0c8a | 227 | |
1033f904 LT |
228 | mutex_unlock(&acpi_dev->physical_node_lock); |
229 | ||
95f8a082 RW |
230 | if (!ACPI_HANDLE(dev)) |
231 | ACPI_HANDLE_SET(dev, acpi_dev->handle); | |
1033f904 LT |
232 | |
233 | if (!physical_node->node_id) | |
234 | strcpy(physical_node_name, PHYSICAL_NODE_STRING); | |
235 | else | |
236 | sprintf(physical_node_name, | |
237 | "physical_node%d", physical_node->node_id); | |
238 | retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, | |
239 | physical_node_name); | |
240 | retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj, | |
241 | "firmware_node"); | |
242 | ||
243 | if (acpi_dev->wakeup.flags.valid) | |
244 | device_set_wakeup_capable(dev, true); | |
245 | ||
4e10d12a | 246 | return 0; |
1033f904 LT |
247 | |
248 | err: | |
95f8a082 | 249 | ACPI_HANDLE_SET(dev, NULL); |
1033f904 LT |
250 | put_device(dev); |
251 | return retval; | |
f3fd0c8a RW |
252 | |
253 | err_free: | |
254 | mutex_unlock(&acpi_dev->physical_node_lock); | |
255 | kfree(physical_node); | |
256 | goto err; | |
4e10d12a DSL |
257 | } |
258 | ||
259 | static int acpi_unbind_one(struct device *dev) | |
260 | { | |
1033f904 LT |
261 | struct acpi_device_physical_node *entry; |
262 | struct acpi_device *acpi_dev; | |
263 | acpi_status status; | |
264 | struct list_head *node, *next; | |
265 | ||
95f8a082 | 266 | if (!ACPI_HANDLE(dev)) |
4e10d12a | 267 | return 0; |
1071695f | 268 | |
95f8a082 | 269 | status = acpi_bus_get_device(ACPI_HANDLE(dev), &acpi_dev); |
1033f904 LT |
270 | if (ACPI_FAILURE(status)) |
271 | goto err; | |
1071695f | 272 | |
1033f904 LT |
273 | mutex_lock(&acpi_dev->physical_node_lock); |
274 | list_for_each_safe(node, next, &acpi_dev->physical_node_list) { | |
275 | char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2]; | |
276 | ||
277 | entry = list_entry(node, struct acpi_device_physical_node, | |
278 | node); | |
279 | if (entry->dev != dev) | |
280 | continue; | |
281 | ||
282 | list_del(node); | |
283 | clear_bit(entry->node_id, acpi_dev->physical_node_id_bitmap); | |
1071695f | 284 | |
1033f904 LT |
285 | acpi_dev->physical_node_count--; |
286 | ||
287 | if (!entry->node_id) | |
288 | strcpy(physical_node_name, PHYSICAL_NODE_STRING); | |
289 | else | |
290 | sprintf(physical_node_name, | |
291 | "physical_node%d", entry->node_id); | |
292 | ||
293 | sysfs_remove_link(&acpi_dev->dev.kobj, physical_node_name); | |
294 | sysfs_remove_link(&dev->kobj, "firmware_node"); | |
95f8a082 | 295 | ACPI_HANDLE_SET(dev, NULL); |
4e10d12a DSL |
296 | /* acpi_bind_one increase refcnt by one */ |
297 | put_device(dev); | |
1033f904 | 298 | kfree(entry); |
4e10d12a | 299 | } |
1033f904 LT |
300 | mutex_unlock(&acpi_dev->physical_node_lock); |
301 | ||
4e10d12a | 302 | return 0; |
1033f904 LT |
303 | |
304 | err: | |
305 | dev_err(dev, "Oops, 'acpi_handle' corrupt\n"); | |
306 | return -EINVAL; | |
4e10d12a DSL |
307 | } |
308 | ||
309 | static int acpi_platform_notify(struct device *dev) | |
310 | { | |
53540098 | 311 | struct acpi_bus_type *type = acpi_get_bus_type(dev); |
4e10d12a | 312 | acpi_handle handle; |
11909ca1 | 313 | int ret; |
4e10d12a | 314 | |
f3fd0c8a | 315 | ret = acpi_bind_one(dev, NULL); |
92414481 | 316 | if (ret && type) { |
11909ca1 RW |
317 | ret = type->find_device(dev, &handle); |
318 | if (ret) { | |
319 | DBG("Unable to get handle for %s\n", dev_name(dev)); | |
320 | goto out; | |
321 | } | |
322 | ret = acpi_bind_one(dev, handle); | |
323 | if (ret) | |
324 | goto out; | |
4e10d12a | 325 | } |
11909ca1 RW |
326 | |
327 | if (type && type->setup) | |
328 | type->setup(dev); | |
4e10d12a | 329 | |
f3fd0c8a | 330 | out: |
4e10d12a DSL |
331 | #if ACPI_GLUE_DEBUG |
332 | if (!ret) { | |
333 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
334 | ||
a412a11d | 335 | acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer); |
db1461ad | 336 | DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer); |
02438d87 | 337 | kfree(buffer.pointer); |
4e10d12a | 338 | } else |
db1461ad | 339 | DBG("Device %s -> No ACPI support\n", dev_name(dev)); |
4e10d12a DSL |
340 | #endif |
341 | ||
342 | return ret; | |
343 | } | |
344 | ||
345 | static int acpi_platform_notify_remove(struct device *dev) | |
346 | { | |
11909ca1 RW |
347 | struct acpi_bus_type *type; |
348 | ||
53540098 | 349 | type = acpi_get_bus_type(dev); |
11909ca1 RW |
350 | if (type && type->cleanup) |
351 | type->cleanup(dev); | |
352 | ||
4e10d12a DSL |
353 | acpi_unbind_one(dev); |
354 | return 0; | |
355 | } | |
356 | ||
0e46517d | 357 | int __init init_acpi_device_notify(void) |
4e10d12a | 358 | { |
4e10d12a DSL |
359 | if (platform_notify || platform_notify_remove) { |
360 | printk(KERN_ERR PREFIX "Can't use platform_notify\n"); | |
361 | return 0; | |
362 | } | |
363 | platform_notify = acpi_platform_notify; | |
364 | platform_notify_remove = acpi_platform_notify_remove; | |
365 | return 0; | |
366 | } |