Commit | Line | Data |
---|---|---|
457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * scan.c - support for transforming the ACPI namespace into individual objects | |
4 | */ | |
5 | ||
6 | #include <linux/module.h> | |
7 | #include <linux/init.h> | |
5a0e3ad6 | 8 | #include <linux/slab.h> |
9b6d97b6 | 9 | #include <linux/kernel.h> |
1da177e4 | 10 | #include <linux/acpi.h> |
643b8e4d | 11 | #include <linux/acpi_iort.h> |
74523c90 AK |
12 | #include <linux/signal.h> |
13 | #include <linux/kthread.h> | |
222e82ac | 14 | #include <linux/dmi.h> |
d1efe3c3 | 15 | #include <linux/nls.h> |
0a0f0d8b | 16 | #include <linux/dma-map-ops.h> |
ca9ef3ab | 17 | #include <linux/platform_data/x86/apple.h> |
ca5999fd | 18 | #include <linux/pgtable.h> |
d783156e | 19 | |
e60cc7a6 BH |
20 | #include "internal.h" |
21 | ||
1da177e4 | 22 | #define _COMPONENT ACPI_BUS_COMPONENT |
f52fd66d | 23 | ACPI_MODULE_NAME("scan"); |
4be44fcd | 24 | extern struct acpi_device *acpi_root; |
1da177e4 LT |
25 | |
26 | #define ACPI_BUS_CLASS "system_bus" | |
29b71a1c | 27 | #define ACPI_BUS_HID "LNXSYBUS" |
1da177e4 LT |
28 | #define ACPI_BUS_DEVICE_NAME "System Bus" |
29 | ||
859ac9a4 BH |
30 | #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent) |
31 | ||
d783156e RW |
32 | #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page) |
33 | ||
620e112c | 34 | static const char *dummy_hid = "device"; |
2b2ae7c7 | 35 | |
40e7fcb1 LT |
36 | static LIST_HEAD(acpi_dep_list); |
37 | static DEFINE_MUTEX(acpi_dep_list_lock); | |
2d12b6b3 | 38 | LIST_HEAD(acpi_bus_id_list); |
c511cc19 | 39 | static DEFINE_MUTEX(acpi_scan_lock); |
ca589f94 | 40 | static LIST_HEAD(acpi_scan_handlers_list); |
9090589d | 41 | DEFINE_MUTEX(acpi_device_lock); |
1da177e4 | 42 | LIST_HEAD(acpi_wakeup_device_list); |
e525506f | 43 | static DEFINE_MUTEX(acpi_hp_context_lock); |
1da177e4 | 44 | |
a4e081b0 SZ |
45 | /* |
46 | * The UART device described by the SPCR table is the only object which needs | |
47 | * special-casing. Everything else is covered by ACPI namespace paths in STAO | |
48 | * table. | |
49 | */ | |
50 | static u64 spcr_uart_addr; | |
51 | ||
40e7fcb1 LT |
52 | struct acpi_dep_data { |
53 | struct list_head node; | |
91438aeb RW |
54 | acpi_handle supplier; |
55 | acpi_handle consumer; | |
40e7fcb1 LT |
56 | }; |
57 | ||
3757b948 RW |
58 | void acpi_scan_lock_acquire(void) |
59 | { | |
60 | mutex_lock(&acpi_scan_lock); | |
61 | } | |
62 | EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire); | |
63 | ||
64 | void acpi_scan_lock_release(void) | |
65 | { | |
66 | mutex_unlock(&acpi_scan_lock); | |
67 | } | |
68 | EXPORT_SYMBOL_GPL(acpi_scan_lock_release); | |
69 | ||
e525506f RW |
70 | void acpi_lock_hp_context(void) |
71 | { | |
72 | mutex_lock(&acpi_hp_context_lock); | |
73 | } | |
74 | ||
75 | void acpi_unlock_hp_context(void) | |
76 | { | |
77 | mutex_unlock(&acpi_hp_context_lock); | |
78 | } | |
79 | ||
5d513205 RW |
80 | void acpi_initialize_hp_context(struct acpi_device *adev, |
81 | struct acpi_hotplug_context *hp, | |
82 | int (*notify)(struct acpi_device *, u32), | |
83 | void (*uevent)(struct acpi_device *, u32)) | |
84 | { | |
85 | acpi_lock_hp_context(); | |
ba574dc8 RW |
86 | hp->notify = notify; |
87 | hp->uevent = uevent; | |
88 | acpi_set_hp_context(adev, hp); | |
5d513205 RW |
89 | acpi_unlock_hp_context(); |
90 | } | |
91 | EXPORT_SYMBOL_GPL(acpi_initialize_hp_context); | |
92 | ||
ca589f94 RW |
93 | int acpi_scan_add_handler(struct acpi_scan_handler *handler) |
94 | { | |
d34afa9d | 95 | if (!handler) |
ca589f94 RW |
96 | return -EINVAL; |
97 | ||
98 | list_add_tail(&handler->list_node, &acpi_scan_handlers_list); | |
99 | return 0; | |
100 | } | |
101 | ||
3f8055c3 RW |
102 | int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler, |
103 | const char *hotplug_profile_name) | |
104 | { | |
105 | int error; | |
106 | ||
107 | error = acpi_scan_add_handler(handler); | |
108 | if (error) | |
109 | return error; | |
110 | ||
111 | acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name); | |
112 | return 0; | |
113 | } | |
114 | ||
caa73ea1 | 115 | bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent) |
d22ddcbc RW |
116 | { |
117 | struct acpi_device_physical_node *pn; | |
118 | bool offline = true; | |
27664c58 | 119 | char *envp[] = { "EVENT=offline", NULL }; |
d22ddcbc | 120 | |
4c533c80 RW |
121 | /* |
122 | * acpi_container_offline() calls this for all of the container's | |
123 | * children under the container's physical_node_lock lock. | |
124 | */ | |
125 | mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING); | |
d22ddcbc RW |
126 | |
127 | list_for_each_entry(pn, &adev->physical_node_list, node) | |
128 | if (device_supports_offline(pn->dev) && !pn->dev->offline) { | |
caa73ea1 | 129 | if (uevent) |
27664c58 | 130 | kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp); |
caa73ea1 | 131 | |
d22ddcbc RW |
132 | offline = false; |
133 | break; | |
134 | } | |
135 | ||
136 | mutex_unlock(&adev->physical_node_lock); | |
137 | return offline; | |
138 | } | |
139 | ||
7f28ddec RW |
140 | static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data, |
141 | void **ret_p) | |
683058e3 RW |
142 | { |
143 | struct acpi_device *device = NULL; | |
144 | struct acpi_device_physical_node *pn; | |
303bfdb1 | 145 | bool second_pass = (bool)data; |
683058e3 RW |
146 | acpi_status status = AE_OK; |
147 | ||
148 | if (acpi_bus_get_device(handle, &device)) | |
149 | return AE_OK; | |
150 | ||
7f28ddec RW |
151 | if (device->handler && !device->handler->hotplug.enabled) { |
152 | *ret_p = &device->dev; | |
153 | return AE_SUPPORT; | |
154 | } | |
155 | ||
683058e3 RW |
156 | mutex_lock(&device->physical_node_lock); |
157 | ||
158 | list_for_each_entry(pn, &device->physical_node_list, node) { | |
159 | int ret; | |
160 | ||
303bfdb1 RW |
161 | if (second_pass) { |
162 | /* Skip devices offlined by the first pass. */ | |
163 | if (pn->put_online) | |
164 | continue; | |
165 | } else { | |
166 | pn->put_online = false; | |
167 | } | |
683058e3 | 168 | ret = device_offline(pn->dev); |
303bfdb1 RW |
169 | if (ret >= 0) { |
170 | pn->put_online = !ret; | |
171 | } else { | |
172 | *ret_p = pn->dev; | |
173 | if (second_pass) { | |
174 | status = AE_ERROR; | |
175 | break; | |
176 | } | |
683058e3 | 177 | } |
683058e3 RW |
178 | } |
179 | ||
180 | mutex_unlock(&device->physical_node_lock); | |
181 | ||
182 | return status; | |
183 | } | |
184 | ||
7f28ddec RW |
185 | static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data, |
186 | void **ret_p) | |
683058e3 RW |
187 | { |
188 | struct acpi_device *device = NULL; | |
189 | struct acpi_device_physical_node *pn; | |
190 | ||
191 | if (acpi_bus_get_device(handle, &device)) | |
192 | return AE_OK; | |
193 | ||
194 | mutex_lock(&device->physical_node_lock); | |
195 | ||
196 | list_for_each_entry(pn, &device->physical_node_list, node) | |
197 | if (pn->put_online) { | |
198 | device_online(pn->dev); | |
199 | pn->put_online = false; | |
200 | } | |
201 | ||
202 | mutex_unlock(&device->physical_node_lock); | |
203 | ||
204 | return AE_OK; | |
205 | } | |
206 | ||
d22ddcbc | 207 | static int acpi_scan_try_to_offline(struct acpi_device *device) |
1da177e4 | 208 | { |
5993c467 | 209 | acpi_handle handle = device->handle; |
d22ddcbc | 210 | struct device *errdev = NULL; |
a33ec399 | 211 | acpi_status status; |
f058cdf4 | 212 | |
303bfdb1 RW |
213 | /* |
214 | * Carry out two passes here and ignore errors in the first pass, | |
215 | * because if the devices in question are memory blocks and | |
216 | * CONFIG_MEMCG is set, one of the blocks may hold data structures | |
217 | * that the other blocks depend on, but it is not known in advance which | |
218 | * block holds them. | |
219 | * | |
220 | * If the first pass is successful, the second one isn't needed, though. | |
221 | */ | |
7f28ddec RW |
222 | status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
223 | NULL, acpi_bus_offline, (void *)false, | |
224 | (void **)&errdev); | |
225 | if (status == AE_SUPPORT) { | |
226 | dev_warn(errdev, "Offline disabled.\n"); | |
227 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
228 | acpi_bus_online, NULL, NULL, NULL); | |
7f28ddec RW |
229 | return -EPERM; |
230 | } | |
231 | acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev); | |
303bfdb1 RW |
232 | if (errdev) { |
233 | errdev = NULL; | |
683058e3 | 234 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
7f28ddec RW |
235 | NULL, acpi_bus_offline, (void *)true, |
236 | (void **)&errdev); | |
ffc10d82 | 237 | if (!errdev) |
7f28ddec RW |
238 | acpi_bus_offline(handle, 0, (void *)true, |
239 | (void **)&errdev); | |
303bfdb1 | 240 | |
ffc10d82 | 241 | if (errdev) { |
303bfdb1 | 242 | dev_warn(errdev, "Offline failed.\n"); |
7f28ddec | 243 | acpi_bus_online(handle, 0, NULL, NULL); |
303bfdb1 | 244 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, |
7f28ddec RW |
245 | ACPI_UINT32_MAX, acpi_bus_online, |
246 | NULL, NULL, NULL); | |
303bfdb1 RW |
247 | return -EBUSY; |
248 | } | |
683058e3 | 249 | } |
d22ddcbc RW |
250 | return 0; |
251 | } | |
252 | ||
253 | static int acpi_scan_hot_remove(struct acpi_device *device) | |
254 | { | |
255 | acpi_handle handle = device->handle; | |
256 | unsigned long long sta; | |
257 | acpi_status status; | |
258 | ||
ffc10d82 | 259 | if (device->handler && device->handler->hotplug.demand_offline) { |
caa73ea1 | 260 | if (!acpi_scan_is_offline(device, true)) |
d22ddcbc RW |
261 | return -EBUSY; |
262 | } else { | |
263 | int error = acpi_scan_try_to_offline(device); | |
264 | if (error) | |
265 | return error; | |
266 | } | |
683058e3 | 267 | |
26d46867 | 268 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
0794469d | 269 | "Hot-removing device %s...\n", dev_name(&device->dev))); |
26d46867 | 270 | |
bfee26db | 271 | acpi_bus_trim(device); |
683058e3 | 272 | |
7d2421f8 | 273 | acpi_evaluate_lck(handle, 0); |
1da177e4 LT |
274 | /* |
275 | * TBD: _EJD support. | |
276 | */ | |
7d2421f8 JL |
277 | status = acpi_evaluate_ej0(handle); |
278 | if (status == AE_NOT_FOUND) | |
279 | return -ENODEV; | |
280 | else if (ACPI_FAILURE(status)) | |
281 | return -EIO; | |
1da177e4 | 282 | |
882fd12e TK |
283 | /* |
284 | * Verify if eject was indeed successful. If not, log an error | |
285 | * message. No need to call _OST since _EJ0 call was made OK. | |
286 | */ | |
287 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
288 | if (ACPI_FAILURE(status)) { | |
289 | acpi_handle_warn(handle, | |
290 | "Status check after eject failed (0x%x)\n", status); | |
291 | } else if (sta & ACPI_STA_DEVICE_ENABLED) { | |
292 | acpi_handle_warn(handle, | |
293 | "Eject incomplete - status 0x%llx\n", sta); | |
294 | } | |
295 | ||
a33ec399 RW |
296 | return 0; |
297 | } | |
1da177e4 | 298 | |
443fc820 RW |
299 | static int acpi_scan_device_not_present(struct acpi_device *adev) |
300 | { | |
301 | if (!acpi_device_enumerated(adev)) { | |
302 | dev_warn(&adev->dev, "Still not present\n"); | |
303 | return -EALREADY; | |
304 | } | |
305 | acpi_bus_trim(adev); | |
306 | return 0; | |
307 | } | |
308 | ||
c27b2c33 | 309 | static int acpi_scan_device_check(struct acpi_device *adev) |
a33ec399 | 310 | { |
f943db40 | 311 | int error; |
a33ec399 | 312 | |
443fc820 RW |
313 | acpi_bus_get_status(adev); |
314 | if (adev->status.present || adev->status.functional) { | |
315 | /* | |
316 | * This function is only called for device objects for which | |
317 | * matching scan handlers exist. The only situation in which | |
318 | * the scan handler is not attached to this device object yet | |
319 | * is when the device has just appeared (either it wasn't | |
320 | * present at all before or it was removed and then added | |
321 | * again). | |
322 | */ | |
323 | if (adev->handler) { | |
324 | dev_warn(&adev->dev, "Already enumerated\n"); | |
325 | return -EALREADY; | |
326 | } | |
327 | error = acpi_bus_scan(adev->handle); | |
328 | if (error) { | |
329 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
330 | return error; | |
331 | } | |
332 | if (!adev->handler) { | |
333 | dev_warn(&adev->dev, "Enumeration failure\n"); | |
334 | error = -ENODEV; | |
335 | } | |
336 | } else { | |
337 | error = acpi_scan_device_not_present(adev); | |
338 | } | |
339 | return error; | |
340 | } | |
341 | ||
342 | static int acpi_scan_bus_check(struct acpi_device *adev) | |
343 | { | |
344 | struct acpi_scan_handler *handler = adev->handler; | |
345 | struct acpi_device *child; | |
346 | int error; | |
347 | ||
348 | acpi_bus_get_status(adev); | |
349 | if (!(adev->status.present || adev->status.functional)) { | |
350 | acpi_scan_device_not_present(adev); | |
351 | return 0; | |
352 | } | |
353 | if (handler && handler->hotplug.scan_dependent) | |
354 | return handler->hotplug.scan_dependent(adev); | |
355 | ||
c27b2c33 RW |
356 | error = acpi_bus_scan(adev->handle); |
357 | if (error) { | |
358 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
359 | return error; | |
360 | } | |
443fc820 RW |
361 | list_for_each_entry(child, &adev->children, node) { |
362 | error = acpi_scan_bus_check(child); | |
363 | if (error) | |
364 | return error; | |
c27b2c33 RW |
365 | } |
366 | return 0; | |
a33ec399 RW |
367 | } |
368 | ||
3c2cc7ff RW |
369 | static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type) |
370 | { | |
371 | switch (type) { | |
372 | case ACPI_NOTIFY_BUS_CHECK: | |
373 | return acpi_scan_bus_check(adev); | |
374 | case ACPI_NOTIFY_DEVICE_CHECK: | |
375 | return acpi_scan_device_check(adev); | |
376 | case ACPI_NOTIFY_EJECT_REQUEST: | |
377 | case ACPI_OST_EC_OSPM_EJECT: | |
dd2151be RW |
378 | if (adev->handler && !adev->handler->hotplug.enabled) { |
379 | dev_info(&adev->dev, "Eject disabled\n"); | |
380 | return -EPERM; | |
381 | } | |
700b8422 RW |
382 | acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST, |
383 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); | |
3c2cc7ff RW |
384 | return acpi_scan_hot_remove(adev); |
385 | } | |
386 | return -EINVAL; | |
387 | } | |
388 | ||
1e3bcb59 | 389 | void acpi_device_hotplug(struct acpi_device *adev, u32 src) |
a33ec399 | 390 | { |
a33ec399 | 391 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
3c2cc7ff | 392 | int error = -ENODEV; |
a33ec399 | 393 | |
683058e3 | 394 | lock_device_hotplug(); |
e0ae8fee | 395 | mutex_lock(&acpi_scan_lock); |
a33ec399 | 396 | |
c27b2c33 RW |
397 | /* |
398 | * The device object's ACPI handle cannot become invalid as long as we | |
3c2cc7ff | 399 | * are holding acpi_scan_lock, but it might have become invalid before |
c27b2c33 RW |
400 | * that lock was acquired. |
401 | */ | |
402 | if (adev->handle == INVALID_ACPI_HANDLE) | |
3c2cc7ff | 403 | goto err_out; |
c27b2c33 | 404 | |
1e2380cd RW |
405 | if (adev->flags.is_dock_station) { |
406 | error = dock_notify(adev, src); | |
407 | } else if (adev->flags.hotplug_notify) { | |
3c2cc7ff RW |
408 | error = acpi_generic_hotplug_event(adev, src); |
409 | } else { | |
be27b3dc | 410 | int (*notify)(struct acpi_device *, u32); |
3c2cc7ff RW |
411 | |
412 | acpi_lock_hp_context(); | |
be27b3dc | 413 | notify = adev->hp ? adev->hp->notify : NULL; |
3c2cc7ff RW |
414 | acpi_unlock_hp_context(); |
415 | /* | |
416 | * There may be additional notify handlers for device objects | |
417 | * without the .event() callback, so ignore them here. | |
418 | */ | |
be27b3dc RW |
419 | if (notify) |
420 | error = notify(adev, src); | |
3c2cc7ff RW |
421 | else |
422 | goto out; | |
a33ec399 | 423 | } |
d429e5c1 LCY |
424 | switch (error) { |
425 | case 0: | |
c27b2c33 | 426 | ost_code = ACPI_OST_SC_SUCCESS; |
d429e5c1 LCY |
427 | break; |
428 | case -EPERM: | |
429 | ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; | |
430 | break; | |
431 | case -EBUSY: | |
432 | ost_code = ACPI_OST_SC_DEVICE_BUSY; | |
433 | break; | |
434 | default: | |
435 | ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; | |
436 | break; | |
437 | } | |
a33ec399 | 438 | |
3c2cc7ff | 439 | err_out: |
700b8422 | 440 | acpi_evaluate_ost(adev->handle, src, ost_code, NULL); |
3c2cc7ff RW |
441 | |
442 | out: | |
78ea4639 | 443 | acpi_bus_put_acpi_device(adev); |
a33ec399 | 444 | mutex_unlock(&acpi_scan_lock); |
e0ae8fee | 445 | unlock_device_hotplug(); |
a33ec399 RW |
446 | } |
447 | ||
0b224527 RW |
448 | static void acpi_free_power_resources_lists(struct acpi_device *device) |
449 | { | |
450 | int i; | |
451 | ||
993cbe59 RW |
452 | if (device->wakeup.flags.valid) |
453 | acpi_power_resources_list_free(&device->wakeup.resources); | |
454 | ||
1b1f3e16 | 455 | if (!device->power.flags.power_resources) |
0b224527 RW |
456 | return; |
457 | ||
458 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { | |
459 | struct acpi_device_power_state *ps = &device->power.states[i]; | |
460 | acpi_power_resources_list_free(&ps->resources); | |
461 | } | |
7f47fa6c BH |
462 | } |
463 | ||
1890a97a | 464 | static void acpi_device_release(struct device *dev) |
1da177e4 | 465 | { |
1890a97a | 466 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1da177e4 | 467 | |
ffdcd955 | 468 | acpi_free_properties(acpi_dev); |
c0af4175 | 469 | acpi_free_pnp_ids(&acpi_dev->pnp); |
0b224527 | 470 | acpi_free_power_resources_lists(acpi_dev); |
1890a97a | 471 | kfree(acpi_dev); |
1da177e4 LT |
472 | } |
473 | ||
d783156e RW |
474 | static void acpi_device_del(struct acpi_device *device) |
475 | { | |
ca9dc8d4 LW |
476 | struct acpi_device_bus_id *acpi_device_bus_id; |
477 | ||
d783156e RW |
478 | mutex_lock(&acpi_device_lock); |
479 | if (device->parent) | |
480 | list_del(&device->node); | |
481 | ||
ca9dc8d4 LW |
482 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) |
483 | if (!strcmp(acpi_device_bus_id->bus_id, | |
484 | acpi_device_hid(device))) { | |
485 | if (acpi_device_bus_id->instance_no > 0) | |
486 | acpi_device_bus_id->instance_no--; | |
487 | else { | |
488 | list_del(&acpi_device_bus_id->node); | |
489 | kfree(acpi_device_bus_id); | |
490 | } | |
491 | break; | |
492 | } | |
493 | ||
d783156e RW |
494 | list_del(&device->wakeup_list); |
495 | mutex_unlock(&acpi_device_lock); | |
496 | ||
497 | acpi_power_add_remove_device(device, false); | |
498 | acpi_device_remove_files(device); | |
499 | if (device->remove) | |
500 | device->remove(device); | |
501 | ||
502 | device_del(&device->dev); | |
503 | } | |
504 | ||
68bdb677 OP |
505 | static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain); |
506 | ||
d783156e RW |
507 | static LIST_HEAD(acpi_device_del_list); |
508 | static DEFINE_MUTEX(acpi_device_del_lock); | |
509 | ||
510 | static void acpi_device_del_work_fn(struct work_struct *work_not_used) | |
511 | { | |
512 | for (;;) { | |
513 | struct acpi_device *adev; | |
514 | ||
515 | mutex_lock(&acpi_device_del_lock); | |
516 | ||
517 | if (list_empty(&acpi_device_del_list)) { | |
518 | mutex_unlock(&acpi_device_del_lock); | |
519 | break; | |
520 | } | |
521 | adev = list_first_entry(&acpi_device_del_list, | |
522 | struct acpi_device, del_list); | |
523 | list_del(&adev->del_list); | |
524 | ||
525 | mutex_unlock(&acpi_device_del_lock); | |
526 | ||
68bdb677 OP |
527 | blocking_notifier_call_chain(&acpi_reconfig_chain, |
528 | ACPI_RECONFIG_DEVICE_REMOVE, adev); | |
529 | ||
d783156e RW |
530 | acpi_device_del(adev); |
531 | /* | |
532 | * Drop references to all power resources that might have been | |
533 | * used by the device. | |
534 | */ | |
535 | acpi_power_transition(adev, ACPI_STATE_D3_COLD); | |
536 | put_device(&adev->dev); | |
537 | } | |
538 | } | |
539 | ||
540 | /** | |
541 | * acpi_scan_drop_device - Drop an ACPI device object. | |
542 | * @handle: Handle of an ACPI namespace node, not used. | |
543 | * @context: Address of the ACPI device object to drop. | |
544 | * | |
545 | * This is invoked by acpi_ns_delete_node() during the removal of the ACPI | |
546 | * namespace node the device object pointed to by @context is attached to. | |
547 | * | |
548 | * The unregistration is carried out asynchronously to avoid running | |
549 | * acpi_device_del() under the ACPICA's namespace mutex and the list is used to | |
550 | * ensure the correct ordering (the device objects must be unregistered in the | |
551 | * same order in which the corresponding namespace nodes are deleted). | |
552 | */ | |
553 | static void acpi_scan_drop_device(acpi_handle handle, void *context) | |
caf5c03f | 554 | { |
d783156e RW |
555 | static DECLARE_WORK(work, acpi_device_del_work_fn); |
556 | struct acpi_device *adev = context; | |
557 | ||
558 | mutex_lock(&acpi_device_del_lock); | |
559 | ||
560 | /* | |
561 | * Use the ACPI hotplug workqueue which is ordered, so this work item | |
562 | * won't run after any hotplug work items submitted subsequently. That | |
563 | * prevents attempts to register device objects identical to those being | |
564 | * deleted from happening concurrently (such attempts result from | |
565 | * hotplug events handled via the ACPI hotplug workqueue). It also will | |
566 | * run after all of the work items submitted previosuly, which helps | |
567 | * those work items to ensure that they are not accessing stale device | |
568 | * objects. | |
569 | */ | |
570 | if (list_empty(&acpi_device_del_list)) | |
571 | acpi_queue_hotplug_work(&work); | |
572 | ||
573 | list_add_tail(&adev->del_list, &acpi_device_del_list); | |
574 | /* Make acpi_ns_validate_handle() return NULL for this handle. */ | |
575 | adev->handle = INVALID_ACPI_HANDLE; | |
576 | ||
577 | mutex_unlock(&acpi_device_del_lock); | |
caf5c03f RW |
578 | } |
579 | ||
78ea4639 RW |
580 | static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device, |
581 | void (*callback)(void *)) | |
caf5c03f RW |
582 | { |
583 | acpi_status status; | |
584 | ||
585 | if (!device) | |
586 | return -EINVAL; | |
587 | ||
78ea4639 RW |
588 | status = acpi_get_data_full(handle, acpi_scan_drop_device, |
589 | (void **)device, callback); | |
caf5c03f RW |
590 | if (ACPI_FAILURE(status) || !*device) { |
591 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", | |
592 | handle)); | |
593 | return -ENODEV; | |
594 | } | |
595 | return 0; | |
596 | } | |
78ea4639 RW |
597 | |
598 | int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) | |
599 | { | |
600 | return acpi_get_device_data(handle, device, NULL); | |
601 | } | |
6585925b | 602 | EXPORT_SYMBOL(acpi_bus_get_device); |
caf5c03f | 603 | |
78ea4639 RW |
604 | static void get_acpi_device(void *dev) |
605 | { | |
606 | if (dev) | |
607 | get_device(&((struct acpi_device *)dev)->dev); | |
608 | } | |
609 | ||
610 | struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle) | |
611 | { | |
612 | struct acpi_device *adev = NULL; | |
613 | ||
614 | acpi_get_device_data(handle, &adev, get_acpi_device); | |
615 | return adev; | |
616 | } | |
617 | ||
618 | void acpi_bus_put_acpi_device(struct acpi_device *adev) | |
619 | { | |
620 | put_device(&adev->dev); | |
621 | } | |
622 | ||
cf860be6 RW |
623 | int acpi_device_add(struct acpi_device *device, |
624 | void (*release)(struct device *)) | |
1da177e4 | 625 | { |
4be44fcd | 626 | int result; |
e49bd2dd ZR |
627 | struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; |
628 | int found = 0; | |
66b7ed40 | 629 | |
d43e167d RW |
630 | if (device->handle) { |
631 | acpi_status status; | |
632 | ||
d783156e | 633 | status = acpi_attach_data(device->handle, acpi_scan_drop_device, |
d43e167d RW |
634 | device); |
635 | if (ACPI_FAILURE(status)) { | |
636 | acpi_handle_err(device->handle, | |
637 | "Unable to attach device data\n"); | |
638 | return -ENODEV; | |
639 | } | |
640 | } | |
641 | ||
9e89dde2 ZR |
642 | /* |
643 | * Linkage | |
644 | * ------- | |
645 | * Link this device to its parent and siblings. | |
646 | */ | |
647 | INIT_LIST_HEAD(&device->children); | |
648 | INIT_LIST_HEAD(&device->node); | |
9e89dde2 | 649 | INIT_LIST_HEAD(&device->wakeup_list); |
1033f904 | 650 | INIT_LIST_HEAD(&device->physical_node_list); |
d783156e | 651 | INIT_LIST_HEAD(&device->del_list); |
1033f904 | 652 | mutex_init(&device->physical_node_lock); |
1da177e4 | 653 | |
e49bd2dd ZR |
654 | new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); |
655 | if (!new_bus_id) { | |
d43e167d RW |
656 | pr_err(PREFIX "Memory allocation error\n"); |
657 | result = -ENOMEM; | |
658 | goto err_detach; | |
1da177e4 | 659 | } |
e49bd2dd | 660 | |
9090589d | 661 | mutex_lock(&acpi_device_lock); |
e49bd2dd ZR |
662 | /* |
663 | * Find suitable bus_id and instance number in acpi_bus_id_list | |
664 | * If failed, create one and link it into acpi_bus_id_list | |
665 | */ | |
666 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { | |
1131b938 BH |
667 | if (!strcmp(acpi_device_bus_id->bus_id, |
668 | acpi_device_hid(device))) { | |
669 | acpi_device_bus_id->instance_no++; | |
e49bd2dd ZR |
670 | found = 1; |
671 | kfree(new_bus_id); | |
672 | break; | |
673 | } | |
1da177e4 | 674 | } |
0c526d96 | 675 | if (!found) { |
e49bd2dd | 676 | acpi_device_bus_id = new_bus_id; |
1131b938 | 677 | strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); |
e49bd2dd ZR |
678 | acpi_device_bus_id->instance_no = 0; |
679 | list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); | |
1da177e4 | 680 | } |
0794469d | 681 | dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); |
1da177e4 | 682 | |
33b57150 | 683 | if (device->parent) |
9e89dde2 | 684 | list_add_tail(&device->node, &device->parent->children); |
33b57150 | 685 | |
9e89dde2 ZR |
686 | if (device->wakeup.flags.valid) |
687 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); | |
9090589d | 688 | mutex_unlock(&acpi_device_lock); |
1da177e4 | 689 | |
1890a97a | 690 | if (device->parent) |
66b7ed40 | 691 | device->dev.parent = &device->parent->dev; |
1890a97a | 692 | device->dev.bus = &acpi_bus_type; |
82c7d5ef | 693 | device->dev.release = release; |
cf860be6 | 694 | result = device_add(&device->dev); |
0c526d96 | 695 | if (result) { |
8b12b922 | 696 | dev_err(&device->dev, "Error registering device\n"); |
d43e167d | 697 | goto err; |
1da177e4 | 698 | } |
1da177e4 | 699 | |
e49bd2dd | 700 | result = acpi_device_setup_files(device); |
0c526d96 | 701 | if (result) |
0794469d KS |
702 | printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", |
703 | dev_name(&device->dev)); | |
1da177e4 | 704 | |
1da177e4 | 705 | return 0; |
d43e167d RW |
706 | |
707 | err: | |
9090589d | 708 | mutex_lock(&acpi_device_lock); |
33b57150 | 709 | if (device->parent) |
e49bd2dd | 710 | list_del(&device->node); |
e49bd2dd | 711 | list_del(&device->wakeup_list); |
9090589d | 712 | mutex_unlock(&acpi_device_lock); |
d43e167d RW |
713 | |
714 | err_detach: | |
d783156e | 715 | acpi_detach_data(device->handle, acpi_scan_drop_device); |
e49bd2dd | 716 | return result; |
1da177e4 LT |
717 | } |
718 | ||
9e89dde2 ZR |
719 | /* -------------------------------------------------------------------------- |
720 | Device Enumeration | |
721 | -------------------------------------------------------------------------- */ | |
2ef33ee7 RW |
722 | static bool acpi_info_matches_ids(struct acpi_device_info *info, |
723 | const char * const ids[]) | |
637b9f1a | 724 | { |
2ef33ee7 | 725 | struct acpi_pnp_device_id_list *cid_list = NULL; |
637b9f1a HG |
726 | int i; |
727 | ||
728 | if (!(info->valid & ACPI_VALID_HID)) | |
729 | return false; | |
730 | ||
2ef33ee7 RW |
731 | if (info->valid & ACPI_VALID_CID) |
732 | cid_list = &info->compatible_id_list; | |
733 | ||
734 | for (i = 0; ids[i]; i++) { | |
735 | int j; | |
736 | ||
737 | if (!strcmp(info->hardware_id.string, ids[i])) | |
637b9f1a | 738 | return true; |
2ef33ee7 RW |
739 | |
740 | if (!cid_list) | |
741 | continue; | |
742 | ||
743 | for (j = 0; j < cid_list->count; j++) { | |
744 | if (!strcmp(cid_list->ids[j].string, ids[i])) | |
745 | return true; | |
746 | } | |
637b9f1a HG |
747 | } |
748 | ||
749 | return false; | |
750 | } | |
751 | ||
752 | /* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */ | |
2ef33ee7 | 753 | static const char * const acpi_ignore_dep_ids[] = { |
2ef33ee7 | 754 | "PNP0D80", /* Windows-compatible System Power Management Controller */ |
9272e97a | 755 | "INT33BD", /* Intel Baytrail Mailbox Device */ |
637b9f1a HG |
756 | NULL |
757 | }; | |
758 | ||
5c478f49 BH |
759 | static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) |
760 | { | |
456de893 | 761 | struct acpi_device *device = NULL; |
5c478f49 | 762 | acpi_status status; |
5c478f49 BH |
763 | |
764 | /* | |
765 | * Fixed hardware devices do not appear in the namespace and do not | |
766 | * have handles, but we fabricate acpi_devices for them, so we have | |
767 | * to deal with them specially. | |
768 | */ | |
456de893 | 769 | if (!handle) |
5c478f49 BH |
770 | return acpi_root; |
771 | ||
772 | do { | |
773 | status = acpi_get_parent(handle, &handle); | |
5c478f49 | 774 | if (ACPI_FAILURE(status)) |
456de893 RW |
775 | return status == AE_NULL_ENTRY ? NULL : acpi_root; |
776 | } while (acpi_bus_get_device(handle, &device)); | |
777 | return device; | |
5c478f49 BH |
778 | } |
779 | ||
9e89dde2 ZR |
780 | acpi_status |
781 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) | |
782 | { | |
783 | acpi_status status; | |
784 | acpi_handle tmp; | |
785 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
786 | union acpi_object *obj; | |
787 | ||
788 | status = acpi_get_handle(handle, "_EJD", &tmp); | |
789 | if (ACPI_FAILURE(status)) | |
790 | return status; | |
791 | ||
792 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); | |
793 | if (ACPI_SUCCESS(status)) { | |
794 | obj = buffer.pointer; | |
3b5fee59 HM |
795 | status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, |
796 | ejd); | |
9e89dde2 ZR |
797 | kfree(buffer.pointer); |
798 | } | |
799 | return status; | |
800 | } | |
801 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); | |
802 | ||
40381a3c | 803 | static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev) |
9e89dde2 | 804 | { |
40381a3c BH |
805 | acpi_handle handle = dev->handle; |
806 | struct acpi_device_wakeup *wakeup = &dev->wakeup; | |
b581a7f9 RW |
807 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
808 | union acpi_object *package = NULL; | |
9e89dde2 | 809 | union acpi_object *element = NULL; |
b581a7f9 | 810 | acpi_status status; |
e88c9c60 | 811 | int err = -ENODATA; |
9e89dde2 | 812 | |
993cbe59 | 813 | INIT_LIST_HEAD(&wakeup->resources); |
9e89dde2 | 814 | |
b581a7f9 RW |
815 | /* _PRW */ |
816 | status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); | |
817 | if (ACPI_FAILURE(status)) { | |
818 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); | |
e88c9c60 | 819 | return err; |
b581a7f9 RW |
820 | } |
821 | ||
822 | package = (union acpi_object *)buffer.pointer; | |
823 | ||
e88c9c60 | 824 | if (!package || package->package.count < 2) |
b581a7f9 | 825 | goto out; |
b581a7f9 | 826 | |
9e89dde2 | 827 | element = &(package->package.elements[0]); |
e88c9c60 | 828 | if (!element) |
b581a7f9 | 829 | goto out; |
e88c9c60 | 830 | |
9e89dde2 ZR |
831 | if (element->type == ACPI_TYPE_PACKAGE) { |
832 | if ((element->package.count < 2) || | |
833 | (element->package.elements[0].type != | |
834 | ACPI_TYPE_LOCAL_REFERENCE) | |
e88c9c60 | 835 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
b581a7f9 | 836 | goto out; |
e88c9c60 | 837 | |
b581a7f9 | 838 | wakeup->gpe_device = |
9e89dde2 | 839 | element->package.elements[0].reference.handle; |
b581a7f9 | 840 | wakeup->gpe_number = |
9e89dde2 ZR |
841 | (u32) element->package.elements[1].integer.value; |
842 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
b581a7f9 RW |
843 | wakeup->gpe_device = NULL; |
844 | wakeup->gpe_number = element->integer.value; | |
845 | } else { | |
b581a7f9 RW |
846 | goto out; |
847 | } | |
9e89dde2 ZR |
848 | |
849 | element = &(package->package.elements[1]); | |
e88c9c60 | 850 | if (element->type != ACPI_TYPE_INTEGER) |
b581a7f9 | 851 | goto out; |
e88c9c60 | 852 | |
b581a7f9 | 853 | wakeup->sleep_state = element->integer.value; |
9e89dde2 | 854 | |
e88c9c60 RW |
855 | err = acpi_extract_power_resources(package, 2, &wakeup->resources); |
856 | if (err) | |
b581a7f9 | 857 | goto out; |
9e89dde2 | 858 | |
0596a52b RW |
859 | if (!list_empty(&wakeup->resources)) { |
860 | int sleep_state; | |
9e89dde2 | 861 | |
b5d667eb RW |
862 | err = acpi_power_wakeup_list_init(&wakeup->resources, |
863 | &sleep_state); | |
864 | if (err) { | |
865 | acpi_handle_warn(handle, "Retrieving current states " | |
866 | "of wakeup power resources failed\n"); | |
867 | acpi_power_resources_list_free(&wakeup->resources); | |
868 | goto out; | |
869 | } | |
0596a52b RW |
870 | if (sleep_state < wakeup->sleep_state) { |
871 | acpi_handle_warn(handle, "Overriding _PRW sleep state " | |
872 | "(S%d) by S%d from power resources\n", | |
873 | (int)wakeup->sleep_state, sleep_state); | |
874 | wakeup->sleep_state = sleep_state; | |
875 | } | |
876 | } | |
9874647b | 877 | |
b581a7f9 RW |
878 | out: |
879 | kfree(buffer.pointer); | |
e88c9c60 | 880 | return err; |
1da177e4 LT |
881 | } |
882 | ||
a1a66393 | 883 | static bool acpi_wakeup_gpe_init(struct acpi_device *device) |
1da177e4 | 884 | { |
0519ade7 | 885 | static const struct acpi_device_id button_device_ids[] = { |
5ceb5f05 BH |
886 | {"PNP0C0C", 0}, /* Power button */ |
887 | {"PNP0C0D", 0}, /* Lid */ | |
888 | {"PNP0C0E", 0}, /* Sleep button */ | |
29b71a1c TR |
889 | {"", 0}, |
890 | }; | |
bd9b2f9a | 891 | struct acpi_device_wakeup *wakeup = &device->wakeup; |
f517709d | 892 | acpi_status status; |
f517709d | 893 | |
bd9b2f9a | 894 | wakeup->flags.notifier_present = 0; |
f517709d RW |
895 | |
896 | /* Power button, Lid switch always enable wakeup */ | |
897 | if (!acpi_match_device_ids(device, button_device_ids)) { | |
b7e38304 ZR |
898 | if (!acpi_match_device_ids(device, &button_device_ids[1])) { |
899 | /* Do not use Lid/sleep button for S5 wakeup */ | |
bd9b2f9a RW |
900 | if (wakeup->sleep_state == ACPI_STATE_S5) |
901 | wakeup->sleep_state = ACPI_STATE_S4; | |
b7e38304 | 902 | } |
bd9b2f9a | 903 | acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number); |
f2b56bc8 | 904 | device_set_wakeup_capable(&device->dev, true); |
a1a66393 | 905 | return true; |
f517709d RW |
906 | } |
907 | ||
a1a66393 RW |
908 | status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device, |
909 | wakeup->gpe_number); | |
910 | return ACPI_SUCCESS(status); | |
f517709d RW |
911 | } |
912 | ||
d57d09a4 | 913 | static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
f517709d | 914 | { |
e88c9c60 | 915 | int err; |
29b71a1c | 916 | |
d57d09a4 | 917 | /* Presence of _PRW indicates wake capable */ |
952c63e9 | 918 | if (!acpi_has_method(device->handle, "_PRW")) |
d57d09a4 RW |
919 | return; |
920 | ||
40381a3c | 921 | err = acpi_bus_extract_wakeup_device_power_package(device); |
e88c9c60 RW |
922 | if (err) { |
923 | dev_err(&device->dev, "_PRW evaluation error: %d\n", err); | |
d57d09a4 | 924 | return; |
9e89dde2 | 925 | } |
1da177e4 | 926 | |
a1a66393 | 927 | device->wakeup.flags.valid = acpi_wakeup_gpe_init(device); |
9b83ccd2 | 928 | device->wakeup.prepare_count = 0; |
a1a66393 RW |
929 | /* |
930 | * Call _PSW/_DSW object to disable its ability to wake the sleeping | |
729b2bdb | 931 | * system for the ACPI device with the _PRW object. |
603fadf3 | 932 | * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW. |
729b2bdb ZY |
933 | * So it is necessary to call _DSW object first. Only when it is not |
934 | * present will the _PSW object used. | |
935 | */ | |
e88c9c60 RW |
936 | err = acpi_device_sleep_wake(device, 0, 0, 0); |
937 | if (err) | |
05de0686 | 938 | pr_debug("error in _DSW or _PSW evaluation\n"); |
1da177e4 | 939 | } |
1da177e4 | 940 | |
f33ce568 RW |
941 | static void acpi_bus_init_power_state(struct acpi_device *device, int state) |
942 | { | |
943 | struct acpi_device_power_state *ps = &device->power.states[state]; | |
ef85bdbe RW |
944 | char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; |
945 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
f33ce568 | 946 | acpi_status status; |
bf325f95 | 947 | |
f33ce568 RW |
948 | INIT_LIST_HEAD(&ps->resources); |
949 | ||
ef85bdbe RW |
950 | /* Evaluate "_PRx" to get referenced power resources */ |
951 | status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); | |
952 | if (ACPI_SUCCESS(status)) { | |
953 | union acpi_object *package = buffer.pointer; | |
954 | ||
955 | if (buffer.length && package | |
956 | && package->type == ACPI_TYPE_PACKAGE | |
956ad9d9 RW |
957 | && package->package.count) |
958 | acpi_extract_power_resources(package, 0, &ps->resources); | |
959 | ||
ef85bdbe | 960 | ACPI_FREE(buffer.pointer); |
f33ce568 RW |
961 | } |
962 | ||
963 | /* Evaluate "_PSx" to see if we can do explicit sets */ | |
ef85bdbe | 964 | pathname[2] = 'S'; |
952c63e9 | 965 | if (acpi_has_method(device->handle, pathname)) |
f33ce568 RW |
966 | ps->flags.explicit_set = 1; |
967 | ||
20dacb71 RW |
968 | /* State is valid if there are means to put the device into it. */ |
969 | if (!list_empty(&ps->resources) || ps->flags.explicit_set) | |
f33ce568 | 970 | ps->flags.valid = 1; |
f33ce568 RW |
971 | |
972 | ps->power = -1; /* Unknown - driver assigned */ | |
973 | ps->latency = -1; /* Unknown - driver assigned */ | |
974 | } | |
975 | ||
d43e167d | 976 | static void acpi_bus_get_power_flags(struct acpi_device *device) |
1da177e4 | 977 | { |
8bc5053b | 978 | u32 i; |
1a365616 | 979 | |
d43e167d | 980 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ |
952c63e9 JL |
981 | if (!acpi_has_method(device->handle, "_PS0") && |
982 | !acpi_has_method(device->handle, "_PR0")) | |
983 | return; | |
1a365616 | 984 | |
d43e167d | 985 | device->flags.power_manageable = 1; |
4be44fcd | 986 | |
9e89dde2 ZR |
987 | /* |
988 | * Power Management Flags | |
989 | */ | |
952c63e9 | 990 | if (acpi_has_method(device->handle, "_PSC")) |
9e89dde2 | 991 | device->power.flags.explicit_get = 1; |
f25c0ae2 | 992 | |
952c63e9 | 993 | if (acpi_has_method(device->handle, "_IRC")) |
9e89dde2 | 994 | device->power.flags.inrush_current = 1; |
1da177e4 | 995 | |
f25c0ae2 RW |
996 | if (acpi_has_method(device->handle, "_DSW")) |
997 | device->power.flags.dsw_present = 1; | |
998 | ||
9e89dde2 ZR |
999 | /* |
1000 | * Enumerate supported power management states | |
1001 | */ | |
f33ce568 RW |
1002 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) |
1003 | acpi_bus_init_power_state(device, i); | |
bf325f95 | 1004 | |
0b224527 | 1005 | INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); |
1da177e4 | 1006 | |
956ad9d9 | 1007 | /* Set the defaults for D0 and D3hot (always supported). */ |
9e89dde2 ZR |
1008 | device->power.states[ACPI_STATE_D0].flags.valid = 1; |
1009 | device->power.states[ACPI_STATE_D0].power = 100; | |
20dacb71 | 1010 | device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1; |
1399dfcd | 1011 | |
956ad9d9 RW |
1012 | /* |
1013 | * Use power resources only if the D0 list of them is populated, because | |
1014 | * some platforms may provide _PR3 only to indicate D3cold support and | |
1015 | * in those cases the power resources list returned by it may be bogus. | |
1016 | */ | |
1017 | if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) { | |
1018 | device->power.flags.power_resources = 1; | |
1019 | /* | |
1020 | * D3cold is supported if the D3hot list of power resources is | |
1021 | * not empty. | |
1022 | */ | |
1023 | if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources)) | |
1024 | device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; | |
1025 | } | |
1026 | ||
1b1f3e16 | 1027 | if (acpi_bus_init_power(device)) |
b3785492 | 1028 | device->flags.power_manageable = 0; |
9e89dde2 | 1029 | } |
c8f7a62c | 1030 | |
d43e167d | 1031 | static void acpi_bus_get_flags(struct acpi_device *device) |
1da177e4 | 1032 | { |
1da177e4 | 1033 | /* Presence of _STA indicates 'dynamic_status' */ |
952c63e9 | 1034 | if (acpi_has_method(device->handle, "_STA")) |
1da177e4 LT |
1035 | device->flags.dynamic_status = 1; |
1036 | ||
1da177e4 | 1037 | /* Presence of _RMV indicates 'removable' */ |
952c63e9 | 1038 | if (acpi_has_method(device->handle, "_RMV")) |
1da177e4 LT |
1039 | device->flags.removable = 1; |
1040 | ||
1041 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ | |
952c63e9 JL |
1042 | if (acpi_has_method(device->handle, "_EJD") || |
1043 | acpi_has_method(device->handle, "_EJ0")) | |
1da177e4 | 1044 | device->flags.ejectable = 1; |
1da177e4 LT |
1045 | } |
1046 | ||
c7bcb4e9 | 1047 | static void acpi_device_get_busid(struct acpi_device *device) |
1da177e4 | 1048 | { |
4be44fcd LB |
1049 | char bus_id[5] = { '?', 0 }; |
1050 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; | |
1051 | int i = 0; | |
1da177e4 LT |
1052 | |
1053 | /* | |
1054 | * Bus ID | |
1055 | * ------ | |
1056 | * The device's Bus ID is simply the object name. | |
1057 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? | |
1058 | */ | |
859ac9a4 | 1059 | if (ACPI_IS_ROOT_DEVICE(device)) { |
1da177e4 | 1060 | strcpy(device->pnp.bus_id, "ACPI"); |
859ac9a4 BH |
1061 | return; |
1062 | } | |
1063 | ||
1064 | switch (device->device_type) { | |
1da177e4 LT |
1065 | case ACPI_BUS_TYPE_POWER_BUTTON: |
1066 | strcpy(device->pnp.bus_id, "PWRF"); | |
1067 | break; | |
1068 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
1069 | strcpy(device->pnp.bus_id, "SLPF"); | |
1070 | break; | |
a64a62ce LZ |
1071 | case ACPI_BUS_TYPE_ECDT_EC: |
1072 | strcpy(device->pnp.bus_id, "ECDT"); | |
1073 | break; | |
1da177e4 | 1074 | default: |
66b7ed40 | 1075 | acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); |
1da177e4 LT |
1076 | /* Clean up trailing underscores (if any) */ |
1077 | for (i = 3; i > 1; i--) { | |
1078 | if (bus_id[i] == '_') | |
1079 | bus_id[i] = '\0'; | |
1080 | else | |
1081 | break; | |
1082 | } | |
1083 | strcpy(device->pnp.bus_id, bus_id); | |
1084 | break; | |
1085 | } | |
1086 | } | |
1087 | ||
ebf4df8d JL |
1088 | /* |
1089 | * acpi_ata_match - see if an acpi object is an ATA device | |
1090 | * | |
1091 | * If an acpi object has one of the ACPI ATA methods defined, | |
1092 | * then we can safely call it an ATA device. | |
1093 | */ | |
1094 | bool acpi_ata_match(acpi_handle handle) | |
1095 | { | |
1096 | return acpi_has_method(handle, "_GTF") || | |
1097 | acpi_has_method(handle, "_GTM") || | |
1098 | acpi_has_method(handle, "_STM") || | |
1099 | acpi_has_method(handle, "_SDD"); | |
1100 | } | |
1101 | ||
54735266 | 1102 | /* |
d4e1a692 | 1103 | * acpi_bay_match - see if an acpi object is an ejectable driver bay |
54735266 ZR |
1104 | * |
1105 | * If an acpi object is ejectable and has one of the ACPI ATA methods defined, | |
1106 | * then we can safely call it an ejectable drive bay | |
1107 | */ | |
ebf4df8d | 1108 | bool acpi_bay_match(acpi_handle handle) |
d4e1a692 | 1109 | { |
54735266 ZR |
1110 | acpi_handle phandle; |
1111 | ||
952c63e9 | 1112 | if (!acpi_has_method(handle, "_EJ0")) |
ebf4df8d JL |
1113 | return false; |
1114 | if (acpi_ata_match(handle)) | |
1115 | return true; | |
1116 | if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) | |
1117 | return false; | |
54735266 | 1118 | |
ebf4df8d | 1119 | return acpi_ata_match(phandle); |
54735266 ZR |
1120 | } |
1121 | ||
b43109fa | 1122 | bool acpi_device_is_battery(struct acpi_device *adev) |
1e2380cd | 1123 | { |
b43109fa | 1124 | struct acpi_hardware_id *hwid; |
1e2380cd | 1125 | |
b43109fa RW |
1126 | list_for_each_entry(hwid, &adev->pnp.ids, list) |
1127 | if (!strcmp("PNP0C0A", hwid->id)) | |
1128 | return true; | |
1e2380cd | 1129 | |
b43109fa | 1130 | return false; |
1e2380cd RW |
1131 | } |
1132 | ||
b43109fa | 1133 | static bool is_ejectable_bay(struct acpi_device *adev) |
1e2380cd | 1134 | { |
b43109fa RW |
1135 | acpi_handle handle = adev->handle; |
1136 | ||
1137 | if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev)) | |
1e2380cd RW |
1138 | return true; |
1139 | ||
1140 | return acpi_bay_match(handle); | |
1141 | } | |
1142 | ||
3620f2f2 | 1143 | /* |
d4e1a692 | 1144 | * acpi_dock_match - see if an acpi object has a _DCK method |
3620f2f2 | 1145 | */ |
ebf4df8d | 1146 | bool acpi_dock_match(acpi_handle handle) |
3620f2f2 | 1147 | { |
ebf4df8d | 1148 | return acpi_has_method(handle, "_DCK"); |
3620f2f2 FS |
1149 | } |
1150 | ||
adc8bb8e HG |
1151 | static acpi_status |
1152 | acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context, | |
1153 | void **return_value) | |
1154 | { | |
1155 | long *cap = context; | |
1156 | ||
1157 | if (acpi_has_method(handle, "_BCM") && | |
1158 | acpi_has_method(handle, "_BCL")) { | |
1159 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight " | |
1160 | "support\n")); | |
1161 | *cap |= ACPI_VIDEO_BACKLIGHT; | |
adc8bb8e HG |
1162 | /* We have backlight support, no need to scan further */ |
1163 | return AE_CTRL_TERMINATE; | |
1164 | } | |
1165 | return 0; | |
1166 | } | |
1167 | ||
1168 | /* Returns true if the ACPI object is a video device which can be | |
1169 | * handled by video.ko. | |
1170 | * The device will get a Linux specific CID added in scan.c to | |
1171 | * identify the device as an ACPI graphics device | |
1172 | * Be aware that the graphics device may not be physically present | |
1173 | * Use acpi_video_get_capabilities() to detect general ACPI video | |
1174 | * capabilities of present cards | |
1175 | */ | |
1176 | long acpi_is_video_device(acpi_handle handle) | |
1177 | { | |
1178 | long video_caps = 0; | |
1179 | ||
1180 | /* Is this device able to support video switching ? */ | |
1181 | if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS")) | |
1182 | video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING; | |
1183 | ||
1184 | /* Is this device able to retrieve a video ROM ? */ | |
1185 | if (acpi_has_method(handle, "_ROM")) | |
1186 | video_caps |= ACPI_VIDEO_ROM_AVAILABLE; | |
1187 | ||
1188 | /* Is this device able to configure which video head to be POSTed ? */ | |
1189 | if (acpi_has_method(handle, "_VPO") && | |
1190 | acpi_has_method(handle, "_GPD") && | |
1191 | acpi_has_method(handle, "_SPD")) | |
1192 | video_caps |= ACPI_VIDEO_DEVICE_POSTING; | |
1193 | ||
1194 | /* Only check for backlight functionality if one of the above hit. */ | |
1195 | if (video_caps) | |
1196 | acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, | |
1197 | ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL, | |
1198 | &video_caps, NULL); | |
1199 | ||
1200 | return video_caps; | |
1201 | } | |
1202 | EXPORT_SYMBOL(acpi_is_video_device); | |
1203 | ||
620e112c | 1204 | const char *acpi_device_hid(struct acpi_device *device) |
15b8dd53 | 1205 | { |
7f47fa6c | 1206 | struct acpi_hardware_id *hid; |
15b8dd53 | 1207 | |
2b2ae7c7 TR |
1208 | if (list_empty(&device->pnp.ids)) |
1209 | return dummy_hid; | |
1210 | ||
7f47fa6c BH |
1211 | hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); |
1212 | return hid->id; | |
1213 | } | |
1214 | EXPORT_SYMBOL(acpi_device_hid); | |
15b8dd53 | 1215 | |
d4e1a692 | 1216 | static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) |
7f47fa6c BH |
1217 | { |
1218 | struct acpi_hardware_id *id; | |
15b8dd53 | 1219 | |
7f47fa6c BH |
1220 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
1221 | if (!id) | |
1222 | return; | |
15b8dd53 | 1223 | |
6a0d12ef | 1224 | id->id = kstrdup_const(dev_id, GFP_KERNEL); |
7f47fa6c BH |
1225 | if (!id->id) { |
1226 | kfree(id); | |
1227 | return; | |
15b8dd53 BM |
1228 | } |
1229 | ||
d4e1a692 TK |
1230 | list_add_tail(&id->list, &pnp->ids); |
1231 | pnp->type.hardware_id = 1; | |
15b8dd53 BM |
1232 | } |
1233 | ||
222e82ac DW |
1234 | /* |
1235 | * Old IBM workstations have a DSDT bug wherein the SMBus object | |
1236 | * lacks the SMBUS01 HID and the methods do not have the necessary "_" | |
1237 | * prefix. Work around this. | |
1238 | */ | |
ebf4df8d | 1239 | static bool acpi_ibm_smbus_match(acpi_handle handle) |
222e82ac | 1240 | { |
ebf4df8d JL |
1241 | char node_name[ACPI_PATH_SEGMENT_LENGTH]; |
1242 | struct acpi_buffer path = { sizeof(node_name), node_name }; | |
222e82ac DW |
1243 | |
1244 | if (!dmi_name_in_vendors("IBM")) | |
ebf4df8d | 1245 | return false; |
222e82ac DW |
1246 | |
1247 | /* Look for SMBS object */ | |
ebf4df8d JL |
1248 | if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || |
1249 | strcmp("SMBS", path.pointer)) | |
1250 | return false; | |
222e82ac DW |
1251 | |
1252 | /* Does it have the necessary (but misnamed) methods? */ | |
952c63e9 JL |
1253 | if (acpi_has_method(handle, "SBI") && |
1254 | acpi_has_method(handle, "SBR") && | |
1255 | acpi_has_method(handle, "SBW")) | |
ebf4df8d JL |
1256 | return true; |
1257 | ||
1258 | return false; | |
222e82ac DW |
1259 | } |
1260 | ||
ae3caa80 JL |
1261 | static bool acpi_object_is_system_bus(acpi_handle handle) |
1262 | { | |
1263 | acpi_handle tmp; | |
1264 | ||
1265 | if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) && | |
1266 | tmp == handle) | |
1267 | return true; | |
1268 | if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) && | |
1269 | tmp == handle) | |
1270 | return true; | |
1271 | ||
1272 | return false; | |
1273 | } | |
1274 | ||
c0af4175 | 1275 | static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, |
6091b263 | 1276 | int device_type, struct acpi_device_info *info) |
1da177e4 | 1277 | { |
78e25fef | 1278 | struct acpi_pnp_device_id_list *cid_list; |
7f47fa6c | 1279 | int i; |
1da177e4 | 1280 | |
c0af4175 | 1281 | switch (device_type) { |
1da177e4 | 1282 | case ACPI_BUS_TYPE_DEVICE: |
c0af4175 TK |
1283 | if (handle == ACPI_ROOT_OBJECT) { |
1284 | acpi_add_id(pnp, ACPI_SYSTEM_HID); | |
859ac9a4 BH |
1285 | break; |
1286 | } | |
1287 | ||
6091b263 | 1288 | if (!info) { |
c0af4175 TK |
1289 | pr_err(PREFIX "%s: Error reading device info\n", |
1290 | __func__); | |
1da177e4 LT |
1291 | return; |
1292 | } | |
1293 | ||
549e6845 | 1294 | if (info->valid & ACPI_VALID_HID) { |
c0af4175 | 1295 | acpi_add_id(pnp, info->hardware_id.string); |
549e6845 RW |
1296 | pnp->type.platform_id = 1; |
1297 | } | |
57f3674f | 1298 | if (info->valid & ACPI_VALID_CID) { |
15b8dd53 | 1299 | cid_list = &info->compatible_id_list; |
57f3674f | 1300 | for (i = 0; i < cid_list->count; i++) |
c0af4175 | 1301 | acpi_add_id(pnp, cid_list->ids[i].string); |
57f3674f | 1302 | } |
1da177e4 | 1303 | if (info->valid & ACPI_VALID_ADR) { |
c0af4175 TK |
1304 | pnp->bus_address = info->address; |
1305 | pnp->type.bus_address = 1; | |
1da177e4 | 1306 | } |
ccf78040 | 1307 | if (info->valid & ACPI_VALID_UID) |
c0af4175 | 1308 | pnp->unique_id = kstrdup(info->unique_id.string, |
ccf78040 | 1309 | GFP_KERNEL); |
26095a01 SS |
1310 | if (info->valid & ACPI_VALID_CLS) |
1311 | acpi_add_id(pnp, info->class_code.string); | |
ae843332 | 1312 | |
57f3674f BH |
1313 | /* |
1314 | * Some devices don't reliably have _HIDs & _CIDs, so add | |
1315 | * synthetic HIDs to make sure drivers can find them. | |
1316 | */ | |
c0af4175 TK |
1317 | if (acpi_is_video_device(handle)) |
1318 | acpi_add_id(pnp, ACPI_VIDEO_HID); | |
ebf4df8d | 1319 | else if (acpi_bay_match(handle)) |
c0af4175 | 1320 | acpi_add_id(pnp, ACPI_BAY_HID); |
ebf4df8d | 1321 | else if (acpi_dock_match(handle)) |
c0af4175 | 1322 | acpi_add_id(pnp, ACPI_DOCK_HID); |
ebf4df8d | 1323 | else if (acpi_ibm_smbus_match(handle)) |
c0af4175 | 1324 | acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); |
ae3caa80 JL |
1325 | else if (list_empty(&pnp->ids) && |
1326 | acpi_object_is_system_bus(handle)) { | |
1327 | /* \_SB, \_TZ, LNXSYBUS */ | |
1328 | acpi_add_id(pnp, ACPI_BUS_HID); | |
c0af4175 TK |
1329 | strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); |
1330 | strcpy(pnp->device_class, ACPI_BUS_CLASS); | |
b7b30de5 | 1331 | } |
54735266 | 1332 | |
1da177e4 LT |
1333 | break; |
1334 | case ACPI_BUS_TYPE_POWER: | |
c0af4175 | 1335 | acpi_add_id(pnp, ACPI_POWER_HID); |
1da177e4 LT |
1336 | break; |
1337 | case ACPI_BUS_TYPE_PROCESSOR: | |
c0af4175 | 1338 | acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); |
1da177e4 | 1339 | break; |
1da177e4 | 1340 | case ACPI_BUS_TYPE_THERMAL: |
c0af4175 | 1341 | acpi_add_id(pnp, ACPI_THERMAL_HID); |
1da177e4 LT |
1342 | break; |
1343 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
c0af4175 | 1344 | acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); |
1da177e4 LT |
1345 | break; |
1346 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
c0af4175 | 1347 | acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); |
1da177e4 | 1348 | break; |
a64a62ce LZ |
1349 | case ACPI_BUS_TYPE_ECDT_EC: |
1350 | acpi_add_id(pnp, ACPI_ECDT_HID); | |
1351 | break; | |
1da177e4 | 1352 | } |
1da177e4 LT |
1353 | } |
1354 | ||
c0af4175 TK |
1355 | void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) |
1356 | { | |
1357 | struct acpi_hardware_id *id, *tmp; | |
1358 | ||
1359 | list_for_each_entry_safe(id, tmp, &pnp->ids, list) { | |
6a0d12ef | 1360 | kfree_const(id->id); |
c0af4175 TK |
1361 | kfree(id); |
1362 | } | |
1363 | kfree(pnp->unique_id); | |
1364 | } | |
1365 | ||
b84f196d SS |
1366 | /** |
1367 | * acpi_dma_supported - Check DMA support for the specified device. | |
1368 | * @adev: The pointer to acpi device | |
1369 | * | |
1370 | * Return false if DMA is not supported. Otherwise, return true | |
1371 | */ | |
1372 | bool acpi_dma_supported(struct acpi_device *adev) | |
1373 | { | |
1374 | if (!adev) | |
1375 | return false; | |
1376 | ||
1377 | if (adev->flags.cca_seen) | |
1378 | return true; | |
1379 | ||
1380 | /* | |
1381 | * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent | |
1382 | * DMA on "Intel platforms". Presumably that includes all x86 and | |
1383 | * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y. | |
1384 | */ | |
1385 | if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED)) | |
1386 | return true; | |
1387 | ||
1388 | return false; | |
1389 | } | |
1390 | ||
1391 | /** | |
1392 | * acpi_get_dma_attr - Check the supported DMA attr for the specified device. | |
1393 | * @adev: The pointer to acpi device | |
1394 | * | |
1395 | * Return enum dev_dma_attr. | |
1396 | */ | |
1397 | enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev) | |
1398 | { | |
1399 | if (!acpi_dma_supported(adev)) | |
1400 | return DEV_DMA_NOT_SUPPORTED; | |
1401 | ||
1402 | if (adev->flags.coherent_dma) | |
1403 | return DEV_DMA_COHERENT; | |
1404 | else | |
1405 | return DEV_DMA_NON_COHERENT; | |
1406 | } | |
1407 | ||
c04ac679 LP |
1408 | /** |
1409 | * acpi_dma_get_range() - Get device DMA parameters. | |
1410 | * | |
1411 | * @dev: device to configure | |
1412 | * @dma_addr: pointer device DMA address result | |
1413 | * @offset: pointer to the DMA offset result | |
1414 | * @size: pointer to DMA range size result | |
1415 | * | |
1416 | * Evaluate DMA regions and return respectively DMA region start, offset | |
1417 | * and size in dma_addr, offset and size on parsing success; it does not | |
1418 | * update the passed in values on failure. | |
1419 | * | |
1420 | * Return 0 on success, < 0 on failure. | |
1421 | */ | |
1422 | int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset, | |
1423 | u64 *size) | |
1424 | { | |
1425 | struct acpi_device *adev; | |
1426 | LIST_HEAD(list); | |
1427 | struct resource_entry *rentry; | |
1428 | int ret; | |
1429 | struct device *dma_dev = dev; | |
1430 | u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0; | |
1431 | ||
1432 | /* | |
1433 | * Walk the device tree chasing an ACPI companion with a _DMA | |
1434 | * object while we go. Stop if we find a device with an ACPI | |
1435 | * companion containing a _DMA method. | |
1436 | */ | |
1437 | do { | |
1438 | adev = ACPI_COMPANION(dma_dev); | |
1439 | if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA)) | |
1440 | break; | |
1441 | ||
1442 | dma_dev = dma_dev->parent; | |
1443 | } while (dma_dev); | |
1444 | ||
1445 | if (!dma_dev) | |
1446 | return -ENODEV; | |
1447 | ||
1448 | if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) { | |
1449 | acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n"); | |
1450 | return -EINVAL; | |
1451 | } | |
1452 | ||
1453 | ret = acpi_dev_get_dma_resources(adev, &list); | |
1454 | if (ret > 0) { | |
1455 | list_for_each_entry(rentry, &list, node) { | |
1456 | if (dma_offset && rentry->offset != dma_offset) { | |
1457 | ret = -EINVAL; | |
1458 | dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n"); | |
1459 | goto out; | |
1460 | } | |
1461 | dma_offset = rentry->offset; | |
1462 | ||
1463 | /* Take lower and upper limits */ | |
1464 | if (rentry->res->start < dma_start) | |
1465 | dma_start = rentry->res->start; | |
1466 | if (rentry->res->end > dma_end) | |
1467 | dma_end = rentry->res->end; | |
1468 | } | |
1469 | ||
1470 | if (dma_start >= dma_end) { | |
1471 | ret = -EINVAL; | |
1472 | dev_dbg(dma_dev, "Invalid DMA regions configuration\n"); | |
1473 | goto out; | |
1474 | } | |
1475 | ||
1476 | *dma_addr = dma_start - dma_offset; | |
1477 | len = dma_end - dma_start; | |
1478 | *size = max(len, len + 1); | |
1479 | *offset = dma_offset; | |
1480 | } | |
1481 | out: | |
1482 | acpi_dev_free_resource_list(&list); | |
1483 | ||
1484 | return ret >= 0 ? 0 : ret; | |
1485 | } | |
1486 | ||
d760a1ba | 1487 | /** |
c1e97359 | 1488 | * acpi_dma_configure_id - Set-up DMA configuration for the device. |
d760a1ba LP |
1489 | * @dev: The pointer to the device |
1490 | * @attr: device dma attributes | |
b8e069a2 | 1491 | * @input_id: input device id const value pointer |
d760a1ba | 1492 | */ |
b8e069a2 LP |
1493 | int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, |
1494 | const u32 *input_id) | |
d760a1ba | 1495 | { |
643b8e4d | 1496 | const struct iommu_ops *iommu; |
7ad42639 | 1497 | u64 dma_addr = 0, size = 0; |
643b8e4d | 1498 | |
e5361ca2 RM |
1499 | if (attr == DEV_DMA_NOT_SUPPORTED) { |
1500 | set_dma_ops(dev, &dma_dummy_ops); | |
1501 | return 0; | |
1502 | } | |
1503 | ||
7ad42639 | 1504 | iort_dma_setup(dev, &dma_addr, &size); |
d760a1ba | 1505 | |
b8e069a2 | 1506 | iommu = iort_iommu_configure_id(dev, input_id); |
45586c70 | 1507 | if (PTR_ERR(iommu) == -EPROBE_DEFER) |
058f8c3f | 1508 | return -EPROBE_DEFER; |
643b8e4d | 1509 | |
7ad42639 LP |
1510 | arch_setup_dma_ops(dev, dma_addr, size, |
1511 | iommu, attr == DEV_DMA_COHERENT); | |
5a1bb638 S |
1512 | |
1513 | return 0; | |
d760a1ba | 1514 | } |
b8e069a2 | 1515 | EXPORT_SYMBOL_GPL(acpi_dma_configure_id); |
d760a1ba | 1516 | |
d0562674 SS |
1517 | static void acpi_init_coherency(struct acpi_device *adev) |
1518 | { | |
1519 | unsigned long long cca = 0; | |
1520 | acpi_status status; | |
1521 | struct acpi_device *parent = adev->parent; | |
1522 | ||
1523 | if (parent && parent->flags.cca_seen) { | |
1524 | /* | |
1525 | * From ACPI spec, OSPM will ignore _CCA if an ancestor | |
1526 | * already saw one. | |
1527 | */ | |
1528 | adev->flags.cca_seen = 1; | |
1529 | cca = parent->flags.coherent_dma; | |
1530 | } else { | |
1531 | status = acpi_evaluate_integer(adev->handle, "_CCA", | |
1532 | NULL, &cca); | |
1533 | if (ACPI_SUCCESS(status)) | |
1534 | adev->flags.cca_seen = 1; | |
1535 | else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED)) | |
1536 | /* | |
1537 | * If architecture does not specify that _CCA is | |
1538 | * required for DMA-able devices (e.g. x86), | |
1539 | * we default to _CCA=1. | |
1540 | */ | |
1541 | cca = 1; | |
1542 | else | |
1543 | acpi_handle_debug(adev->handle, | |
1544 | "ACPI device is missing _CCA.\n"); | |
1545 | } | |
1546 | ||
1547 | adev->flags.coherent_dma = cca; | |
1548 | } | |
1549 | ||
e361d1f8 | 1550 | static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data) |
e4330d8b | 1551 | { |
e361d1f8 | 1552 | bool *is_serial_bus_slave_p = data; |
e4330d8b JN |
1553 | |
1554 | if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) | |
1555 | return 1; | |
1556 | ||
e361d1f8 | 1557 | *is_serial_bus_slave_p = true; |
e4330d8b JN |
1558 | |
1559 | /* no need to do more checking */ | |
1560 | return -1; | |
1561 | } | |
1562 | ||
dfda4492 JG |
1563 | static bool acpi_is_indirect_io_slave(struct acpi_device *device) |
1564 | { | |
1565 | struct acpi_device *parent = device->parent; | |
a6f07295 | 1566 | static const struct acpi_device_id indirect_io_hosts[] = { |
dfda4492 JG |
1567 | {"HISI0191", 0}, |
1568 | {} | |
1569 | }; | |
1570 | ||
1571 | return parent && !acpi_match_device_ids(parent, indirect_io_hosts); | |
1572 | } | |
1573 | ||
d87fb091 | 1574 | static bool acpi_device_enumeration_by_parent(struct acpi_device *device) |
e4330d8b JN |
1575 | { |
1576 | struct list_head resource_list; | |
e361d1f8 | 1577 | bool is_serial_bus_slave = false; |
aba94139 HG |
1578 | /* |
1579 | * These devices have multiple I2cSerialBus resources and an i2c-client | |
1580 | * must be instantiated for each, each with its own i2c_device_id. | |
1581 | * Normally we only instantiate an i2c-client for the first resource, | |
1582 | * using the ACPI HID as id. These special cases are handled by the | |
1583 | * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows | |
1584 | * which i2c_device_id to use for each resource. | |
1585 | */ | |
1586 | static const struct acpi_device_id i2c_multi_instantiate_ids[] = { | |
1587 | {"BSG1160", }, | |
96f984d3 | 1588 | {"BSG2150", }, |
589edb56 | 1589 | {"INT33FE", }, |
a3dd034a | 1590 | {"INT3515", }, |
aba94139 HG |
1591 | {} |
1592 | }; | |
e4330d8b | 1593 | |
dfda4492 JG |
1594 | if (acpi_is_indirect_io_slave(device)) |
1595 | return true; | |
1596 | ||
ca9ef3ab LW |
1597 | /* Macs use device properties in lieu of _CRS resources */ |
1598 | if (x86_apple_machine && | |
1599 | (fwnode_property_present(&device->fwnode, "spiSclkPeriod") || | |
e361d1f8 FD |
1600 | fwnode_property_present(&device->fwnode, "i2cAddress") || |
1601 | fwnode_property_present(&device->fwnode, "baud"))) | |
ca9ef3ab LW |
1602 | return true; |
1603 | ||
aba94139 HG |
1604 | /* Instantiate a pdev for the i2c-multi-instantiate drv to bind to */ |
1605 | if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids)) | |
1606 | return false; | |
1607 | ||
e4330d8b | 1608 | INIT_LIST_HEAD(&resource_list); |
e361d1f8 FD |
1609 | acpi_dev_get_resources(device, &resource_list, |
1610 | acpi_check_serial_bus_slave, | |
1611 | &is_serial_bus_slave); | |
e4330d8b JN |
1612 | acpi_dev_free_resource_list(&resource_list); |
1613 | ||
e361d1f8 | 1614 | return is_serial_bus_slave; |
e4330d8b JN |
1615 | } |
1616 | ||
82c7d5ef | 1617 | void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, |
6091b263 HG |
1618 | int type, unsigned long long sta, |
1619 | struct acpi_device_info *info) | |
1da177e4 | 1620 | { |
d43e167d RW |
1621 | INIT_LIST_HEAD(&device->pnp.ids); |
1622 | device->device_type = type; | |
1623 | device->handle = handle; | |
1624 | device->parent = acpi_bus_get_parent(handle); | |
01bb86b3 | 1625 | fwnode_init(&device->fwnode, &acpi_device_fwnode_ops); |
25db115b | 1626 | acpi_set_device_status(device, sta); |
d43e167d | 1627 | acpi_device_get_busid(device); |
6091b263 | 1628 | acpi_set_pnp_ids(handle, &device->pnp, type, info); |
ffdcd955 | 1629 | acpi_init_properties(device); |
d43e167d | 1630 | acpi_bus_get_flags(device); |
2c0d4fe0 | 1631 | device->flags.match_driver = false; |
202317a5 | 1632 | device->flags.initialized = true; |
d87fb091 JG |
1633 | device->flags.enumeration_by_parent = |
1634 | acpi_device_enumeration_by_parent(device); | |
10c7e20b | 1635 | acpi_device_clear_enumerated(device); |
cf860be6 RW |
1636 | device_initialize(&device->dev); |
1637 | dev_set_uevent_suppress(&device->dev, true); | |
d0562674 | 1638 | acpi_init_coherency(device); |
cf860be6 | 1639 | } |
bc3b0772 | 1640 | |
cf860be6 RW |
1641 | void acpi_device_add_finalize(struct acpi_device *device) |
1642 | { | |
1643 | dev_set_uevent_suppress(&device->dev, false); | |
1644 | kobject_uevent(&device->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
1645 | } |
1646 | ||
5c478f49 BH |
1647 | static int acpi_add_single_object(struct acpi_device **child, |
1648 | acpi_handle handle, int type, | |
2c0d4fe0 | 1649 | unsigned long long sta) |
1da177e4 | 1650 | { |
77c24888 BH |
1651 | int result; |
1652 | struct acpi_device *device; | |
29aaefa6 | 1653 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
6091b263 HG |
1654 | struct acpi_device_info *info = NULL; |
1655 | ||
1656 | if (handle != ACPI_ROOT_OBJECT && type == ACPI_BUS_TYPE_DEVICE) | |
1657 | acpi_get_object_info(handle, &info); | |
1da177e4 | 1658 | |
36bcbec7 | 1659 | device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
1da177e4 | 1660 | if (!device) { |
6468463a | 1661 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
6091b263 | 1662 | kfree(info); |
d550d98d | 1663 | return -ENOMEM; |
1da177e4 | 1664 | } |
1da177e4 | 1665 | |
6091b263 HG |
1666 | acpi_init_device_object(device, handle, type, sta, info); |
1667 | kfree(info); | |
63347db0 HG |
1668 | /* |
1669 | * For ACPI_BUS_TYPE_DEVICE getting the status is delayed till here so | |
1670 | * that we can call acpi_bus_get_status() and use its quirk handling. | |
1671 | * Note this must be done before the get power-/wakeup_dev-flags calls. | |
1672 | */ | |
1673 | if (type == ACPI_BUS_TYPE_DEVICE) | |
5971b0c1 HG |
1674 | if (acpi_bus_get_status(device) < 0) |
1675 | acpi_set_device_status(device, 0); | |
63347db0 | 1676 | |
d43e167d | 1677 | acpi_bus_get_power_flags(device); |
d57d09a4 | 1678 | acpi_bus_get_wakeup_device_flags(device); |
1da177e4 | 1679 | |
cf860be6 | 1680 | result = acpi_device_add(device, acpi_device_release); |
d43e167d | 1681 | if (result) { |
718fb0de | 1682 | acpi_device_release(&device->dev); |
d43e167d RW |
1683 | return result; |
1684 | } | |
1da177e4 | 1685 | |
d43e167d | 1686 | acpi_power_add_remove_device(device, true); |
cf860be6 | 1687 | acpi_device_add_finalize(device); |
d43e167d RW |
1688 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
1689 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n", | |
1690 | dev_name(&device->dev), (char *) buffer.pointer, | |
1691 | device->parent ? dev_name(&device->parent->dev) : "(null)")); | |
1692 | kfree(buffer.pointer); | |
1693 | *child = device; | |
1694 | return 0; | |
bf325f95 RW |
1695 | } |
1696 | ||
a4e081b0 SZ |
1697 | static acpi_status acpi_get_resource_memory(struct acpi_resource *ares, |
1698 | void *context) | |
1699 | { | |
1700 | struct resource *res = context; | |
1701 | ||
1702 | if (acpi_dev_resource_memory(ares, res)) | |
1703 | return AE_CTRL_TERMINATE; | |
1704 | ||
1705 | return AE_OK; | |
1706 | } | |
1707 | ||
1708 | static bool acpi_device_should_be_hidden(acpi_handle handle) | |
1709 | { | |
1710 | acpi_status status; | |
1711 | struct resource res; | |
1712 | ||
1713 | /* Check if it should ignore the UART device */ | |
1714 | if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS))) | |
1715 | return false; | |
1716 | ||
1717 | /* | |
1718 | * The UART device described in SPCR table is assumed to have only one | |
1719 | * memory resource present. So we only look for the first one here. | |
1720 | */ | |
1721 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
1722 | acpi_get_resource_memory, &res); | |
1723 | if (ACPI_FAILURE(status) || res.start != spcr_uart_addr) | |
1724 | return false; | |
1725 | ||
1726 | acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n", | |
1727 | &res.start); | |
1728 | ||
1729 | return true; | |
1730 | } | |
1731 | ||
778cbc1d BH |
1732 | static int acpi_bus_type_and_status(acpi_handle handle, int *type, |
1733 | unsigned long long *sta) | |
1da177e4 | 1734 | { |
778cbc1d BH |
1735 | acpi_status status; |
1736 | acpi_object_type acpi_type; | |
1da177e4 | 1737 | |
778cbc1d | 1738 | status = acpi_get_type(handle, &acpi_type); |
51a85faf | 1739 | if (ACPI_FAILURE(status)) |
778cbc1d | 1740 | return -ENODEV; |
4be44fcd | 1741 | |
778cbc1d | 1742 | switch (acpi_type) { |
51a85faf BH |
1743 | case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ |
1744 | case ACPI_TYPE_DEVICE: | |
a4e081b0 SZ |
1745 | if (acpi_device_should_be_hidden(handle)) |
1746 | return -ENODEV; | |
1747 | ||
778cbc1d | 1748 | *type = ACPI_BUS_TYPE_DEVICE; |
63347db0 HG |
1749 | /* |
1750 | * acpi_add_single_object updates this once we've an acpi_device | |
1751 | * so that acpi_bus_get_status' quirk handling can be used. | |
1752 | */ | |
5971b0c1 | 1753 | *sta = ACPI_STA_DEFAULT; |
51a85faf BH |
1754 | break; |
1755 | case ACPI_TYPE_PROCESSOR: | |
778cbc1d BH |
1756 | *type = ACPI_BUS_TYPE_PROCESSOR; |
1757 | status = acpi_bus_get_status_handle(handle, sta); | |
1758 | if (ACPI_FAILURE(status)) | |
1759 | return -ENODEV; | |
51a85faf BH |
1760 | break; |
1761 | case ACPI_TYPE_THERMAL: | |
778cbc1d BH |
1762 | *type = ACPI_BUS_TYPE_THERMAL; |
1763 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1764 | break; |
1765 | case ACPI_TYPE_POWER: | |
778cbc1d BH |
1766 | *type = ACPI_BUS_TYPE_POWER; |
1767 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1768 | break; |
1769 | default: | |
778cbc1d | 1770 | return -ENODEV; |
51a85faf | 1771 | } |
1da177e4 | 1772 | |
778cbc1d BH |
1773 | return 0; |
1774 | } | |
1775 | ||
cde1f95f | 1776 | bool acpi_device_is_present(const struct acpi_device *adev) |
202317a5 | 1777 | { |
cde1f95f | 1778 | return adev->status.present || adev->status.functional; |
202317a5 RW |
1779 | } |
1780 | ||
4b59cc1f | 1781 | static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, |
844142c3 | 1782 | const char *idstr, |
4b59cc1f RW |
1783 | const struct acpi_device_id **matchid) |
1784 | { | |
1785 | const struct acpi_device_id *devid; | |
1786 | ||
aca0a4eb RW |
1787 | if (handler->match) |
1788 | return handler->match(idstr, matchid); | |
1789 | ||
4b59cc1f RW |
1790 | for (devid = handler->ids; devid->id[0]; devid++) |
1791 | if (!strcmp((char *)devid->id, idstr)) { | |
1792 | if (matchid) | |
1793 | *matchid = devid; | |
1794 | ||
1795 | return true; | |
1796 | } | |
1797 | ||
1798 | return false; | |
1799 | } | |
1800 | ||
844142c3 | 1801 | static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr, |
6b772e8f TK |
1802 | const struct acpi_device_id **matchid) |
1803 | { | |
1804 | struct acpi_scan_handler *handler; | |
1805 | ||
1806 | list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) | |
1807 | if (acpi_scan_handler_matching(handler, idstr, matchid)) | |
1808 | return handler; | |
1809 | ||
1810 | return NULL; | |
1811 | } | |
1812 | ||
3f8055c3 RW |
1813 | void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) |
1814 | { | |
3f8055c3 RW |
1815 | if (!!hotplug->enabled == !!val) |
1816 | return; | |
1817 | ||
1818 | mutex_lock(&acpi_scan_lock); | |
1819 | ||
1820 | hotplug->enabled = val; | |
3f8055c3 RW |
1821 | |
1822 | mutex_unlock(&acpi_scan_lock); | |
1823 | } | |
1824 | ||
3c2cc7ff | 1825 | static void acpi_scan_init_hotplug(struct acpi_device *adev) |
a33ec399 | 1826 | { |
6b772e8f | 1827 | struct acpi_hardware_id *hwid; |
a33ec399 | 1828 | |
b43109fa | 1829 | if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) { |
1e2380cd RW |
1830 | acpi_dock_add(adev); |
1831 | return; | |
1832 | } | |
3c2cc7ff RW |
1833 | list_for_each_entry(hwid, &adev->pnp.ids, list) { |
1834 | struct acpi_scan_handler *handler; | |
a33ec399 | 1835 | |
6b772e8f | 1836 | handler = acpi_scan_match_handler(hwid->id, NULL); |
1a699476 RW |
1837 | if (handler) { |
1838 | adev->flags.hotplug_notify = true; | |
1839 | break; | |
1840 | } | |
3c2cc7ff | 1841 | } |
a33ec399 RW |
1842 | } |
1843 | ||
6fc25088 | 1844 | static u32 acpi_scan_check_dep(acpi_handle handle) |
40e7fcb1 | 1845 | { |
40e7fcb1 LT |
1846 | struct acpi_handle_list dep_devices; |
1847 | acpi_status status; | |
6fc25088 | 1848 | u32 count; |
40e7fcb1 LT |
1849 | int i; |
1850 | ||
71da201f RW |
1851 | /* |
1852 | * Check for _HID here to avoid deferring the enumeration of: | |
1853 | * 1. PCI devices. | |
1854 | * 2. ACPI nodes describing USB ports. | |
1855 | * Still, checking for _HID catches more then just these cases ... | |
1856 | */ | |
1857 | if (!acpi_has_method(handle, "_DEP") || !acpi_has_method(handle, "_HID")) | |
6fc25088 | 1858 | return 0; |
40e7fcb1 | 1859 | |
6fc25088 | 1860 | status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices); |
40e7fcb1 | 1861 | if (ACPI_FAILURE(status)) { |
6fc25088 RW |
1862 | acpi_handle_debug(handle, "Failed to evaluate _DEP.\n"); |
1863 | return 0; | |
40e7fcb1 LT |
1864 | } |
1865 | ||
6fc25088 | 1866 | for (count = 0, i = 0; i < dep_devices.count; i++) { |
40e7fcb1 | 1867 | struct acpi_device_info *info; |
6fc25088 RW |
1868 | struct acpi_dep_data *dep; |
1869 | bool skip; | |
40e7fcb1 LT |
1870 | |
1871 | status = acpi_get_object_info(dep_devices.handles[i], &info); | |
1872 | if (ACPI_FAILURE(status)) { | |
6fc25088 | 1873 | acpi_handle_debug(handle, "Error reading _DEP device info\n"); |
40e7fcb1 LT |
1874 | continue; |
1875 | } | |
1876 | ||
2ef33ee7 | 1877 | skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids); |
40e7fcb1 LT |
1878 | kfree(info); |
1879 | ||
1880 | if (skip) | |
1881 | continue; | |
1882 | ||
6fc25088 | 1883 | dep = kzalloc(sizeof(*dep), GFP_KERNEL); |
40e7fcb1 | 1884 | if (!dep) |
6fc25088 RW |
1885 | continue; |
1886 | ||
1887 | count++; | |
40e7fcb1 | 1888 | |
91438aeb | 1889 | dep->supplier = dep_devices.handles[i]; |
6fc25088 | 1890 | dep->consumer = handle; |
40e7fcb1 LT |
1891 | |
1892 | mutex_lock(&acpi_dep_list_lock); | |
1893 | list_add_tail(&dep->node , &acpi_dep_list); | |
1894 | mutex_unlock(&acpi_dep_list_lock); | |
1895 | } | |
6fc25088 RW |
1896 | |
1897 | return count; | |
40e7fcb1 LT |
1898 | } |
1899 | ||
71da201f RW |
1900 | static void acpi_scan_dep_init(struct acpi_device *adev) |
1901 | { | |
1902 | struct acpi_dep_data *dep; | |
1903 | ||
1904 | mutex_lock(&acpi_dep_list_lock); | |
1905 | ||
1906 | list_for_each_entry(dep, &acpi_dep_list, node) { | |
1907 | if (dep->consumer == adev->handle) | |
1908 | adev->dep_unmet++; | |
1909 | } | |
1910 | ||
1911 | mutex_unlock(&acpi_dep_list_lock); | |
1912 | } | |
1913 | ||
0de7fb7c RW |
1914 | static bool acpi_bus_scan_second_pass; |
1915 | ||
71da201f RW |
1916 | static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep, |
1917 | struct acpi_device **adev_p) | |
778cbc1d | 1918 | { |
805d410f | 1919 | struct acpi_device *device = NULL; |
778cbc1d | 1920 | unsigned long long sta; |
6fc25088 | 1921 | int type; |
778cbc1d BH |
1922 | int result; |
1923 | ||
4002bf38 RW |
1924 | acpi_bus_get_device(handle, &device); |
1925 | if (device) | |
1926 | goto out; | |
1927 | ||
778cbc1d BH |
1928 | result = acpi_bus_type_and_status(handle, &type, &sta); |
1929 | if (result) | |
1930 | return AE_OK; | |
1931 | ||
82c7d5ef RW |
1932 | if (type == ACPI_BUS_TYPE_POWER) { |
1933 | acpi_add_power_resource(handle); | |
1934 | return AE_OK; | |
1935 | } | |
1936 | ||
71da201f RW |
1937 | if (type == ACPI_BUS_TYPE_DEVICE && check_dep) { |
1938 | u32 count = acpi_scan_check_dep(handle); | |
1939 | /* Bail out if the number of recorded dependencies is not 0. */ | |
0de7fb7c RW |
1940 | if (count > 0) { |
1941 | acpi_bus_scan_second_pass = true; | |
71da201f | 1942 | return AE_CTRL_DEPTH; |
0de7fb7c | 1943 | } |
71da201f | 1944 | } |
6fc25088 | 1945 | |
2c0d4fe0 | 1946 | acpi_add_single_object(&device, handle, type, sta); |
e3b87f8a | 1947 | if (!device) |
51a85faf | 1948 | return AE_CTRL_DEPTH; |
1da177e4 | 1949 | |
3c2cc7ff | 1950 | acpi_scan_init_hotplug(device); |
71da201f RW |
1951 | if (!check_dep) |
1952 | acpi_scan_dep_init(device); | |
3c2cc7ff | 1953 | |
71da201f RW |
1954 | out: |
1955 | if (!*adev_p) | |
1956 | *adev_p = device; | |
805d410f | 1957 | |
51a85faf BH |
1958 | return AE_OK; |
1959 | } | |
3fb02738 | 1960 | |
71da201f RW |
1961 | static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used, |
1962 | void *not_used, void **ret_p) | |
1963 | { | |
1964 | return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p); | |
1965 | } | |
1966 | ||
1967 | static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used, | |
1968 | void *not_used, void **ret_p) | |
1969 | { | |
1970 | return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p); | |
1971 | } | |
1972 | ||
48459340 ZR |
1973 | static void acpi_default_enumeration(struct acpi_device *device) |
1974 | { | |
48459340 | 1975 | /* |
d87fb091 JG |
1976 | * Do not enumerate devices with enumeration_by_parent flag set as |
1977 | * they will be enumerated by their respective parents. | |
48459340 | 1978 | */ |
d87fb091 | 1979 | if (!device->flags.enumeration_by_parent) { |
1571875b | 1980 | acpi_create_platform_device(device, NULL); |
10c7e20b | 1981 | acpi_device_set_enumerated(device); |
68bdb677 OP |
1982 | } else { |
1983 | blocking_notifier_call_chain(&acpi_reconfig_chain, | |
1984 | ACPI_RECONFIG_DEVICE_ADD, device); | |
10c7e20b | 1985 | } |
48459340 ZR |
1986 | } |
1987 | ||
7d284352 | 1988 | static const struct acpi_device_id generic_device_ids[] = { |
ee892094 | 1989 | {ACPI_DT_NAMESPACE_HID, }, |
7d284352 RW |
1990 | {"", }, |
1991 | }; | |
1992 | ||
1993 | static int acpi_generic_device_attach(struct acpi_device *adev, | |
1994 | const struct acpi_device_id *not_used) | |
1995 | { | |
1996 | /* | |
ee892094 RW |
1997 | * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test |
1998 | * below can be unconditional. | |
7d284352 RW |
1999 | */ |
2000 | if (adev->data.of_compatible) | |
2001 | acpi_default_enumeration(adev); | |
2002 | ||
2003 | return 1; | |
2004 | } | |
2005 | ||
2006 | static struct acpi_scan_handler generic_device_handler = { | |
2007 | .ids = generic_device_ids, | |
2008 | .attach = acpi_generic_device_attach, | |
2009 | }; | |
2010 | ||
c5698074 | 2011 | static int acpi_scan_attach_handler(struct acpi_device *device) |
ca589f94 | 2012 | { |
c5698074 RW |
2013 | struct acpi_hardware_id *hwid; |
2014 | int ret = 0; | |
ca589f94 | 2015 | |
c5698074 | 2016 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
87b85b3c | 2017 | const struct acpi_device_id *devid; |
c5698074 | 2018 | struct acpi_scan_handler *handler; |
ca589f94 | 2019 | |
c5698074 RW |
2020 | handler = acpi_scan_match_handler(hwid->id, &devid); |
2021 | if (handler) { | |
d34afa9d RW |
2022 | if (!handler->attach) { |
2023 | device->pnp.type.platform_id = 0; | |
2024 | continue; | |
2025 | } | |
9cb32acf | 2026 | device->handler = handler; |
87b85b3c | 2027 | ret = handler->attach(device, devid); |
9cb32acf | 2028 | if (ret > 0) |
c5698074 | 2029 | break; |
9cb32acf RW |
2030 | |
2031 | device->handler = NULL; | |
2032 | if (ret < 0) | |
c5698074 | 2033 | break; |
ca589f94 RW |
2034 | } |
2035 | } | |
48459340 | 2036 | |
ca589f94 RW |
2037 | return ret; |
2038 | } | |
2039 | ||
71da201f | 2040 | static void acpi_bus_attach(struct acpi_device *device, bool first_pass) |
51a85faf | 2041 | { |
2c22e652 | 2042 | struct acpi_device *child; |
71da201f | 2043 | bool skip = !first_pass && device->flags.visited; |
1e2380cd | 2044 | acpi_handle ejd; |
ca589f94 | 2045 | int ret; |
3fb02738 | 2046 | |
71da201f RW |
2047 | if (skip) |
2048 | goto ok; | |
2049 | ||
1e2380cd RW |
2050 | if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd))) |
2051 | register_dock_dependent_device(device, ejd); | |
2052 | ||
2c22e652 | 2053 | acpi_bus_get_status(device); |
202317a5 | 2054 | /* Skip devices that are not present. */ |
2c22e652 | 2055 | if (!acpi_device_is_present(device)) { |
cde1f95f | 2056 | device->flags.initialized = false; |
10c7e20b | 2057 | acpi_device_clear_enumerated(device); |
1b1f3e16 | 2058 | device->flags.power_manageable = 0; |
2c22e652 RW |
2059 | return; |
2060 | } | |
3a391a39 | 2061 | if (device->handler) |
2c22e652 | 2062 | goto ok; |
3a391a39 | 2063 | |
202317a5 | 2064 | if (!device->flags.initialized) { |
1b1f3e16 RW |
2065 | device->flags.power_manageable = |
2066 | device->power.states[ACPI_STATE_D0].flags.valid; | |
2067 | if (acpi_bus_init_power(device)) | |
2068 | device->flags.power_manageable = 0; | |
2069 | ||
202317a5 | 2070 | device->flags.initialized = true; |
c381fc3a RW |
2071 | } else if (device->flags.visited) { |
2072 | goto ok; | |
202317a5 | 2073 | } |
10c7e20b | 2074 | |
ca589f94 | 2075 | ret = acpi_scan_attach_handler(device); |
6931007c | 2076 | if (ret < 0) |
2c22e652 | 2077 | return; |
6931007c RW |
2078 | |
2079 | device->flags.match_driver = true; | |
d87fb091 | 2080 | if (ret > 0 && !device->flags.enumeration_by_parent) { |
f406270b RW |
2081 | acpi_device_set_enumerated(device); |
2082 | goto ok; | |
2c22e652 | 2083 | } |
202317a5 | 2084 | |
f406270b RW |
2085 | ret = device_attach(&device->dev); |
2086 | if (ret < 0) | |
2087 | return; | |
2088 | ||
d87fb091 | 2089 | if (device->pnp.type.platform_id || device->flags.enumeration_by_parent) |
e4330d8b | 2090 | acpi_default_enumeration(device); |
d87fb091 JG |
2091 | else |
2092 | acpi_device_set_enumerated(device); | |
f406270b | 2093 | |
2c22e652 RW |
2094 | ok: |
2095 | list_for_each_entry(child, &device->children, node) | |
71da201f | 2096 | acpi_bus_attach(child, first_pass); |
8ab17fc9 | 2097 | |
71da201f | 2098 | if (!skip && device->handler && device->handler->hotplug.notify_online) |
8ab17fc9 | 2099 | device->handler->hotplug.notify_online(device); |
1da177e4 | 2100 | } |
1da177e4 | 2101 | |
40e7fcb1 LT |
2102 | void acpi_walk_dep_device_list(acpi_handle handle) |
2103 | { | |
2104 | struct acpi_dep_data *dep, *tmp; | |
2105 | struct acpi_device *adev; | |
2106 | ||
2107 | mutex_lock(&acpi_dep_list_lock); | |
2108 | list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) { | |
91438aeb RW |
2109 | if (dep->supplier == handle) { |
2110 | acpi_bus_get_device(dep->consumer, &adev); | |
40e7fcb1 LT |
2111 | if (!adev) |
2112 | continue; | |
2113 | ||
2114 | adev->dep_unmet--; | |
2115 | if (!adev->dep_unmet) | |
71da201f RW |
2116 | acpi_bus_attach(adev, true); |
2117 | ||
40e7fcb1 LT |
2118 | list_del(&dep->node); |
2119 | kfree(dep); | |
2120 | } | |
2121 | } | |
2122 | mutex_unlock(&acpi_dep_list_lock); | |
2123 | } | |
2124 | EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list); | |
2125 | ||
636458de | 2126 | /** |
b8bd759a | 2127 | * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. |
636458de | 2128 | * @handle: Root of the namespace scope to scan. |
7779688f | 2129 | * |
636458de RW |
2130 | * Scan a given ACPI tree (probably recently hot-plugged) and create and add |
2131 | * found devices. | |
7779688f | 2132 | * |
636458de RW |
2133 | * If no devices were found, -ENODEV is returned, but it does not mean that |
2134 | * there has been a real error. There just have been no suitable ACPI objects | |
2135 | * in the table trunk from which the kernel could create a device and add an | |
2136 | * appropriate driver. | |
3757b948 RW |
2137 | * |
2138 | * Must be called under acpi_scan_lock. | |
7779688f | 2139 | */ |
b8bd759a | 2140 | int acpi_bus_scan(acpi_handle handle) |
3fb02738 | 2141 | { |
71da201f RW |
2142 | struct acpi_device *device = NULL; |
2143 | ||
0de7fb7c | 2144 | acpi_bus_scan_second_pass = false; |
3fb02738 | 2145 | |
71da201f | 2146 | /* Pass 1: Avoid enumerating devices with missing dependencies. */ |
3fb02738 | 2147 | |
71da201f | 2148 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device))) |
b8bd759a | 2149 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
71da201f RW |
2150 | acpi_bus_check_add_1, NULL, NULL, |
2151 | (void **)&device); | |
3fb02738 | 2152 | |
71da201f RW |
2153 | if (!device) |
2154 | return -ENODEV; | |
3fb02738 | 2155 | |
71da201f RW |
2156 | acpi_bus_attach(device, true); |
2157 | ||
0de7fb7c | 2158 | if (!acpi_bus_scan_second_pass) |
2c22e652 | 2159 | return 0; |
0de7fb7c | 2160 | |
71da201f RW |
2161 | /* Pass 2: Enumerate all of the remaining devices. */ |
2162 | ||
2163 | device = NULL; | |
2164 | ||
2165 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, false, &device))) | |
2166 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
2167 | acpi_bus_check_add_2, NULL, NULL, | |
2168 | (void **)&device); | |
2169 | ||
2170 | acpi_bus_attach(device, false); | |
2171 | ||
2172 | return 0; | |
3fb02738 | 2173 | } |
2c22e652 | 2174 | EXPORT_SYMBOL(acpi_bus_scan); |
1da177e4 | 2175 | |
3757b948 | 2176 | /** |
2c22e652 RW |
2177 | * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects. |
2178 | * @adev: Root of the ACPI namespace scope to walk. | |
3757b948 RW |
2179 | * |
2180 | * Must be called under acpi_scan_lock. | |
2181 | */ | |
2c22e652 | 2182 | void acpi_bus_trim(struct acpi_device *adev) |
1da177e4 | 2183 | { |
2c22e652 RW |
2184 | struct acpi_scan_handler *handler = adev->handler; |
2185 | struct acpi_device *child; | |
2186 | ||
2187 | list_for_each_entry_reverse(child, &adev->children, node) | |
2188 | acpi_bus_trim(child); | |
2189 | ||
a951c773 | 2190 | adev->flags.match_driver = false; |
2c22e652 RW |
2191 | if (handler) { |
2192 | if (handler->detach) | |
2193 | handler->detach(adev); | |
2194 | ||
2195 | adev->handler = NULL; | |
2196 | } else { | |
2197 | device_release_driver(&adev->dev); | |
2198 | } | |
05404d8f | 2199 | /* |
2c22e652 RW |
2200 | * Most likely, the device is going away, so put it into D3cold before |
2201 | * that. | |
05404d8f | 2202 | */ |
2c22e652 RW |
2203 | acpi_device_set_power(adev, ACPI_STATE_D3_COLD); |
2204 | adev->flags.initialized = false; | |
10c7e20b | 2205 | acpi_device_clear_enumerated(adev); |
1da177e4 | 2206 | } |
ceaba663 KA |
2207 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
2208 | ||
a64a62ce LZ |
2209 | int acpi_bus_register_early_device(int type) |
2210 | { | |
2211 | struct acpi_device *device = NULL; | |
2212 | int result; | |
2213 | ||
2214 | result = acpi_add_single_object(&device, NULL, | |
2215 | type, ACPI_STA_DEFAULT); | |
2216 | if (result) | |
2217 | return result; | |
2218 | ||
2219 | device->flags.match_driver = true; | |
2220 | return device_attach(&device->dev); | |
2221 | } | |
2222 | EXPORT_SYMBOL_GPL(acpi_bus_register_early_device); | |
2223 | ||
e8b945c9 | 2224 | static int acpi_bus_scan_fixed(void) |
1da177e4 | 2225 | { |
4be44fcd | 2226 | int result = 0; |
c4168bff | 2227 | |
1da177e4 LT |
2228 | /* |
2229 | * Enumerate all fixed-feature devices. | |
2230 | */ | |
2c0d4fe0 RW |
2231 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { |
2232 | struct acpi_device *device = NULL; | |
2233 | ||
5c478f49 | 2234 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2235 | ACPI_BUS_TYPE_POWER_BUTTON, |
2c0d4fe0 RW |
2236 | ACPI_STA_DEFAULT); |
2237 | if (result) | |
2238 | return result; | |
2239 | ||
88346167 | 2240 | device->flags.match_driver = true; |
2c0d4fe0 RW |
2241 | result = device_attach(&device->dev); |
2242 | if (result < 0) | |
2243 | return result; | |
2244 | ||
c10d7a13 | 2245 | device_init_wakeup(&device->dev, true); |
3fb02738 | 2246 | } |
1da177e4 | 2247 | |
2c0d4fe0 RW |
2248 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { |
2249 | struct acpi_device *device = NULL; | |
2250 | ||
5c478f49 | 2251 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2252 | ACPI_BUS_TYPE_SLEEP_BUTTON, |
2c0d4fe0 RW |
2253 | ACPI_STA_DEFAULT); |
2254 | if (result) | |
2255 | return result; | |
2256 | ||
88346167 | 2257 | device->flags.match_driver = true; |
2c0d4fe0 | 2258 | result = device_attach(&device->dev); |
3fb02738 | 2259 | } |
1da177e4 | 2260 | |
2c0d4fe0 | 2261 | return result < 0 ? result : 0; |
1da177e4 LT |
2262 | } |
2263 | ||
a4e081b0 SZ |
2264 | static void __init acpi_get_spcr_uart_addr(void) |
2265 | { | |
2266 | acpi_status status; | |
2267 | struct acpi_table_spcr *spcr_ptr; | |
2268 | ||
2269 | status = acpi_get_table(ACPI_SIG_SPCR, 0, | |
2270 | (struct acpi_table_header **)&spcr_ptr); | |
ead7ba13 HG |
2271 | if (ACPI_FAILURE(status)) { |
2272 | pr_warn(PREFIX "STAO table present, but SPCR is missing\n"); | |
2273 | return; | |
2274 | } | |
2275 | ||
2276 | spcr_uart_addr = spcr_ptr->serial_port.address; | |
2277 | acpi_put_table((struct acpi_table_header *)spcr_ptr); | |
a4e081b0 SZ |
2278 | } |
2279 | ||
68bdb677 OP |
2280 | static bool acpi_scan_initialized; |
2281 | ||
e747f274 | 2282 | int __init acpi_scan_init(void) |
1da177e4 LT |
2283 | { |
2284 | int result; | |
a4e081b0 SZ |
2285 | acpi_status status; |
2286 | struct acpi_table_stao *stao_ptr; | |
1da177e4 | 2287 | |
92ef2a25 | 2288 | acpi_pci_root_init(); |
4daeaf68 | 2289 | acpi_pci_link_init(); |
ac212b69 | 2290 | acpi_processor_init(); |
cb0701ac | 2291 | acpi_platform_init(); |
f58b082a | 2292 | acpi_lpss_init(); |
92082a88 | 2293 | acpi_apd_init(); |
2fa97feb | 2294 | acpi_cmos_rtc_init(); |
737f1a9f | 2295 | acpi_container_init(); |
0a347644 | 2296 | acpi_memory_hotplug_init(); |
cc6a0e31 | 2297 | acpi_watchdog_init(); |
eec15edb | 2298 | acpi_pnp_init(); |
3230bbfc | 2299 | acpi_int340x_thermal_init(); |
6ce2e188 | 2300 | acpi_amba_init(); |
eeb2d80d | 2301 | acpi_init_lpit(); |
97d9a9e9 | 2302 | |
7d284352 RW |
2303 | acpi_scan_add_handler(&generic_device_handler); |
2304 | ||
a4e081b0 SZ |
2305 | /* |
2306 | * If there is STAO table, check whether it needs to ignore the UART | |
2307 | * device in SPCR table. | |
2308 | */ | |
2309 | status = acpi_get_table(ACPI_SIG_STAO, 0, | |
2310 | (struct acpi_table_header **)&stao_ptr); | |
2311 | if (ACPI_SUCCESS(status)) { | |
2312 | if (stao_ptr->header.length > sizeof(struct acpi_table_stao)) | |
ead7ba13 | 2313 | pr_info(PREFIX "STAO Name List not yet supported.\n"); |
a4e081b0 SZ |
2314 | |
2315 | if (stao_ptr->ignore_uart) | |
2316 | acpi_get_spcr_uart_addr(); | |
ead7ba13 HG |
2317 | |
2318 | acpi_put_table((struct acpi_table_header *)stao_ptr); | |
a4e081b0 SZ |
2319 | } |
2320 | ||
eb7f43c4 RW |
2321 | acpi_gpe_apply_masked_gpes(); |
2322 | acpi_update_all_gpes(); | |
2323 | ||
7291edca DH |
2324 | /* |
2325 | * Although we call __add_memory() that is documented to require the | |
2326 | * device_hotplug_lock, it is not necessary here because this is an | |
2327 | * early code when userspace or any other code path cannot trigger | |
2328 | * hotplug/hotunplug operations. | |
2329 | */ | |
3757b948 | 2330 | mutex_lock(&acpi_scan_lock); |
1da177e4 LT |
2331 | /* |
2332 | * Enumerate devices in the ACPI namespace. | |
2333 | */ | |
0cd6ac52 RW |
2334 | result = acpi_bus_scan(ACPI_ROOT_OBJECT); |
2335 | if (result) | |
3757b948 | 2336 | goto out; |
1da177e4 | 2337 | |
0cd6ac52 | 2338 | result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); |
1da177e4 | 2339 | if (result) |
3757b948 | 2340 | goto out; |
1da177e4 | 2341 | |
2650ef42 AL |
2342 | /* Fixed feature devices do not exist on HW-reduced platform */ |
2343 | if (!acpi_gbl_reduced_hardware) { | |
2344 | result = acpi_bus_scan_fixed(); | |
2345 | if (result) { | |
2346 | acpi_detach_data(acpi_root->handle, | |
2347 | acpi_scan_drop_device); | |
2348 | acpi_device_del(acpi_root); | |
2349 | put_device(&acpi_root->dev); | |
2350 | goto out; | |
2351 | } | |
b8bd759a | 2352 | } |
1da177e4 | 2353 | |
68bdb677 OP |
2354 | acpi_scan_initialized = true; |
2355 | ||
3757b948 RW |
2356 | out: |
2357 | mutex_unlock(&acpi_scan_lock); | |
2358 | return result; | |
1da177e4 | 2359 | } |
e647b532 MZ |
2360 | |
2361 | static struct acpi_probe_entry *ape; | |
2362 | static int acpi_probe_count; | |
5331d9ca | 2363 | static DEFINE_MUTEX(acpi_probe_mutex); |
e647b532 | 2364 | |
60574d1e | 2365 | static int __init acpi_match_madt(union acpi_subtable_headers *header, |
e647b532 MZ |
2366 | const unsigned long end) |
2367 | { | |
60574d1e | 2368 | if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape)) |
e647b532 MZ |
2369 | if (!ape->probe_subtbl(header, end)) |
2370 | acpi_probe_count++; | |
2371 | ||
2372 | return 0; | |
2373 | } | |
2374 | ||
2375 | int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr) | |
2376 | { | |
2377 | int count = 0; | |
2378 | ||
2379 | if (acpi_disabled) | |
2380 | return 0; | |
2381 | ||
5331d9ca | 2382 | mutex_lock(&acpi_probe_mutex); |
e647b532 | 2383 | for (ape = ap_head; nr; ape++, nr--) { |
5599fb69 | 2384 | if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) { |
e647b532 MZ |
2385 | acpi_probe_count = 0; |
2386 | acpi_table_parse_madt(ape->type, acpi_match_madt, 0); | |
2387 | count += acpi_probe_count; | |
2388 | } else { | |
2389 | int res; | |
2390 | res = acpi_table_parse(ape->id, ape->probe_table); | |
2391 | if (!res) | |
2392 | count++; | |
2393 | } | |
2394 | } | |
5331d9ca | 2395 | mutex_unlock(&acpi_probe_mutex); |
e647b532 MZ |
2396 | |
2397 | return count; | |
2398 | } | |
68bdb677 OP |
2399 | |
2400 | struct acpi_table_events_work { | |
2401 | struct work_struct work; | |
2402 | void *table; | |
2403 | u32 event; | |
2404 | }; | |
2405 | ||
2406 | static void acpi_table_events_fn(struct work_struct *work) | |
2407 | { | |
2408 | struct acpi_table_events_work *tew; | |
2409 | ||
2410 | tew = container_of(work, struct acpi_table_events_work, work); | |
2411 | ||
2412 | if (tew->event == ACPI_TABLE_EVENT_LOAD) { | |
2413 | acpi_scan_lock_acquire(); | |
2414 | acpi_bus_scan(ACPI_ROOT_OBJECT); | |
2415 | acpi_scan_lock_release(); | |
2416 | } | |
2417 | ||
2418 | kfree(tew); | |
2419 | } | |
2420 | ||
2421 | void acpi_scan_table_handler(u32 event, void *table, void *context) | |
2422 | { | |
2423 | struct acpi_table_events_work *tew; | |
2424 | ||
2425 | if (!acpi_scan_initialized) | |
2426 | return; | |
2427 | ||
2428 | if (event != ACPI_TABLE_EVENT_LOAD) | |
2429 | return; | |
2430 | ||
2431 | tew = kmalloc(sizeof(*tew), GFP_KERNEL); | |
2432 | if (!tew) | |
2433 | return; | |
2434 | ||
2435 | INIT_WORK(&tew->work, acpi_table_events_fn); | |
2436 | tew->table = table; | |
2437 | tew->event = event; | |
2438 | ||
2439 | schedule_work(&tew->work); | |
2440 | } | |
2441 | ||
2442 | int acpi_reconfig_notifier_register(struct notifier_block *nb) | |
2443 | { | |
2444 | return blocking_notifier_chain_register(&acpi_reconfig_chain, nb); | |
2445 | } | |
2446 | EXPORT_SYMBOL(acpi_reconfig_notifier_register); | |
2447 | ||
2448 | int acpi_reconfig_notifier_unregister(struct notifier_block *nb) | |
2449 | { | |
2450 | return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb); | |
2451 | } | |
2452 | EXPORT_SYMBOL(acpi_reconfig_notifier_unregister); |