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); | |
a58015d6 | 489 | kfree_const(acpi_device_bus_id->bus_id); |
ca9dc8d4 LW |
490 | kfree(acpi_device_bus_id); |
491 | } | |
492 | break; | |
493 | } | |
494 | ||
d783156e RW |
495 | list_del(&device->wakeup_list); |
496 | mutex_unlock(&acpi_device_lock); | |
497 | ||
498 | acpi_power_add_remove_device(device, false); | |
499 | acpi_device_remove_files(device); | |
500 | if (device->remove) | |
501 | device->remove(device); | |
502 | ||
503 | device_del(&device->dev); | |
504 | } | |
505 | ||
68bdb677 OP |
506 | static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain); |
507 | ||
d783156e RW |
508 | static LIST_HEAD(acpi_device_del_list); |
509 | static DEFINE_MUTEX(acpi_device_del_lock); | |
510 | ||
511 | static void acpi_device_del_work_fn(struct work_struct *work_not_used) | |
512 | { | |
513 | for (;;) { | |
514 | struct acpi_device *adev; | |
515 | ||
516 | mutex_lock(&acpi_device_del_lock); | |
517 | ||
518 | if (list_empty(&acpi_device_del_list)) { | |
519 | mutex_unlock(&acpi_device_del_lock); | |
520 | break; | |
521 | } | |
522 | adev = list_first_entry(&acpi_device_del_list, | |
523 | struct acpi_device, del_list); | |
524 | list_del(&adev->del_list); | |
525 | ||
526 | mutex_unlock(&acpi_device_del_lock); | |
527 | ||
68bdb677 OP |
528 | blocking_notifier_call_chain(&acpi_reconfig_chain, |
529 | ACPI_RECONFIG_DEVICE_REMOVE, adev); | |
530 | ||
d783156e RW |
531 | acpi_device_del(adev); |
532 | /* | |
533 | * Drop references to all power resources that might have been | |
534 | * used by the device. | |
535 | */ | |
536 | acpi_power_transition(adev, ACPI_STATE_D3_COLD); | |
537 | put_device(&adev->dev); | |
538 | } | |
539 | } | |
540 | ||
541 | /** | |
542 | * acpi_scan_drop_device - Drop an ACPI device object. | |
543 | * @handle: Handle of an ACPI namespace node, not used. | |
544 | * @context: Address of the ACPI device object to drop. | |
545 | * | |
546 | * This is invoked by acpi_ns_delete_node() during the removal of the ACPI | |
547 | * namespace node the device object pointed to by @context is attached to. | |
548 | * | |
549 | * The unregistration is carried out asynchronously to avoid running | |
550 | * acpi_device_del() under the ACPICA's namespace mutex and the list is used to | |
551 | * ensure the correct ordering (the device objects must be unregistered in the | |
552 | * same order in which the corresponding namespace nodes are deleted). | |
553 | */ | |
554 | static void acpi_scan_drop_device(acpi_handle handle, void *context) | |
caf5c03f | 555 | { |
d783156e RW |
556 | static DECLARE_WORK(work, acpi_device_del_work_fn); |
557 | struct acpi_device *adev = context; | |
558 | ||
559 | mutex_lock(&acpi_device_del_lock); | |
560 | ||
561 | /* | |
562 | * Use the ACPI hotplug workqueue which is ordered, so this work item | |
563 | * won't run after any hotplug work items submitted subsequently. That | |
564 | * prevents attempts to register device objects identical to those being | |
565 | * deleted from happening concurrently (such attempts result from | |
566 | * hotplug events handled via the ACPI hotplug workqueue). It also will | |
567 | * run after all of the work items submitted previosuly, which helps | |
568 | * those work items to ensure that they are not accessing stale device | |
569 | * objects. | |
570 | */ | |
571 | if (list_empty(&acpi_device_del_list)) | |
572 | acpi_queue_hotplug_work(&work); | |
573 | ||
574 | list_add_tail(&adev->del_list, &acpi_device_del_list); | |
575 | /* Make acpi_ns_validate_handle() return NULL for this handle. */ | |
576 | adev->handle = INVALID_ACPI_HANDLE; | |
577 | ||
578 | mutex_unlock(&acpi_device_del_lock); | |
caf5c03f RW |
579 | } |
580 | ||
78ea4639 RW |
581 | static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device, |
582 | void (*callback)(void *)) | |
caf5c03f RW |
583 | { |
584 | acpi_status status; | |
585 | ||
586 | if (!device) | |
587 | return -EINVAL; | |
588 | ||
78a18fec HG |
589 | *device = NULL; |
590 | ||
78ea4639 RW |
591 | status = acpi_get_data_full(handle, acpi_scan_drop_device, |
592 | (void **)device, callback); | |
caf5c03f RW |
593 | if (ACPI_FAILURE(status) || !*device) { |
594 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", | |
595 | handle)); | |
596 | return -ENODEV; | |
597 | } | |
598 | return 0; | |
599 | } | |
78ea4639 RW |
600 | |
601 | int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) | |
602 | { | |
603 | return acpi_get_device_data(handle, device, NULL); | |
604 | } | |
6585925b | 605 | EXPORT_SYMBOL(acpi_bus_get_device); |
caf5c03f | 606 | |
78ea4639 RW |
607 | static void get_acpi_device(void *dev) |
608 | { | |
609 | if (dev) | |
610 | get_device(&((struct acpi_device *)dev)->dev); | |
611 | } | |
612 | ||
613 | struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle) | |
614 | { | |
615 | struct acpi_device *adev = NULL; | |
616 | ||
617 | acpi_get_device_data(handle, &adev, get_acpi_device); | |
618 | return adev; | |
619 | } | |
620 | ||
621 | void acpi_bus_put_acpi_device(struct acpi_device *adev) | |
622 | { | |
623 | put_device(&adev->dev); | |
624 | } | |
625 | ||
c1013ff7 RW |
626 | static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id) |
627 | { | |
628 | struct acpi_device_bus_id *acpi_device_bus_id; | |
629 | ||
630 | /* Find suitable bus_id and instance number in acpi_bus_id_list. */ | |
631 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { | |
632 | if (!strcmp(acpi_device_bus_id->bus_id, dev_id)) | |
633 | return acpi_device_bus_id; | |
634 | } | |
635 | return NULL; | |
636 | } | |
637 | ||
cf860be6 RW |
638 | int acpi_device_add(struct acpi_device *device, |
639 | void (*release)(struct device *)) | |
1da177e4 | 640 | { |
c1013ff7 | 641 | struct acpi_device_bus_id *acpi_device_bus_id; |
4be44fcd | 642 | int result; |
66b7ed40 | 643 | |
d43e167d RW |
644 | if (device->handle) { |
645 | acpi_status status; | |
646 | ||
d783156e | 647 | status = acpi_attach_data(device->handle, acpi_scan_drop_device, |
d43e167d RW |
648 | device); |
649 | if (ACPI_FAILURE(status)) { | |
650 | acpi_handle_err(device->handle, | |
651 | "Unable to attach device data\n"); | |
652 | return -ENODEV; | |
653 | } | |
654 | } | |
655 | ||
9e89dde2 ZR |
656 | /* |
657 | * Linkage | |
658 | * ------- | |
659 | * Link this device to its parent and siblings. | |
660 | */ | |
661 | INIT_LIST_HEAD(&device->children); | |
662 | INIT_LIST_HEAD(&device->node); | |
9e89dde2 | 663 | INIT_LIST_HEAD(&device->wakeup_list); |
1033f904 | 664 | INIT_LIST_HEAD(&device->physical_node_list); |
d783156e | 665 | INIT_LIST_HEAD(&device->del_list); |
1033f904 | 666 | mutex_init(&device->physical_node_lock); |
1da177e4 | 667 | |
9090589d | 668 | mutex_lock(&acpi_device_lock); |
c1013ff7 RW |
669 | |
670 | acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device)); | |
671 | if (acpi_device_bus_id) { | |
672 | acpi_device_bus_id->instance_no++; | |
673 | } else { | |
674 | acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id), | |
675 | GFP_KERNEL); | |
676 | if (!acpi_device_bus_id) { | |
677 | result = -ENOMEM; | |
678 | goto err_unlock; | |
e49bd2dd | 679 | } |
a58015d6 DC |
680 | acpi_device_bus_id->bus_id = |
681 | kstrdup_const(acpi_device_hid(device), GFP_KERNEL); | |
682 | if (!acpi_device_bus_id->bus_id) { | |
c1013ff7 | 683 | kfree(acpi_device_bus_id); |
a58015d6 | 684 | result = -ENOMEM; |
c1013ff7 | 685 | goto err_unlock; |
a58015d6 DC |
686 | } |
687 | ||
e49bd2dd | 688 | list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); |
1da177e4 | 689 | } |
0794469d | 690 | dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); |
1da177e4 | 691 | |
33b57150 | 692 | if (device->parent) |
9e89dde2 | 693 | list_add_tail(&device->node, &device->parent->children); |
33b57150 | 694 | |
9e89dde2 ZR |
695 | if (device->wakeup.flags.valid) |
696 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); | |
5e73c518 | 697 | |
9090589d | 698 | mutex_unlock(&acpi_device_lock); |
1da177e4 | 699 | |
1890a97a | 700 | if (device->parent) |
66b7ed40 | 701 | device->dev.parent = &device->parent->dev; |
5e73c518 | 702 | |
1890a97a | 703 | device->dev.bus = &acpi_bus_type; |
82c7d5ef | 704 | device->dev.release = release; |
cf860be6 | 705 | result = device_add(&device->dev); |
0c526d96 | 706 | if (result) { |
8b12b922 | 707 | dev_err(&device->dev, "Error registering device\n"); |
d43e167d | 708 | goto err; |
1da177e4 | 709 | } |
1da177e4 | 710 | |
e49bd2dd | 711 | result = acpi_device_setup_files(device); |
0c526d96 | 712 | if (result) |
0794469d KS |
713 | printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", |
714 | dev_name(&device->dev)); | |
1da177e4 | 715 | |
1da177e4 | 716 | return 0; |
d43e167d | 717 | |
5e73c518 | 718 | err: |
9090589d | 719 | mutex_lock(&acpi_device_lock); |
5e73c518 | 720 | |
33b57150 | 721 | if (device->parent) |
e49bd2dd | 722 | list_del(&device->node); |
5e73c518 | 723 | |
e49bd2dd | 724 | list_del(&device->wakeup_list); |
a58015d6 | 725 | |
5e73c518 | 726 | err_unlock: |
9090589d | 727 | mutex_unlock(&acpi_device_lock); |
d43e167d | 728 | |
d783156e | 729 | acpi_detach_data(device->handle, acpi_scan_drop_device); |
5e73c518 | 730 | |
e49bd2dd | 731 | return result; |
1da177e4 LT |
732 | } |
733 | ||
9e89dde2 ZR |
734 | /* -------------------------------------------------------------------------- |
735 | Device Enumeration | |
736 | -------------------------------------------------------------------------- */ | |
2ef33ee7 RW |
737 | static bool acpi_info_matches_ids(struct acpi_device_info *info, |
738 | const char * const ids[]) | |
637b9f1a | 739 | { |
2ef33ee7 | 740 | struct acpi_pnp_device_id_list *cid_list = NULL; |
637b9f1a HG |
741 | int i; |
742 | ||
743 | if (!(info->valid & ACPI_VALID_HID)) | |
744 | return false; | |
745 | ||
2ef33ee7 RW |
746 | if (info->valid & ACPI_VALID_CID) |
747 | cid_list = &info->compatible_id_list; | |
748 | ||
749 | for (i = 0; ids[i]; i++) { | |
750 | int j; | |
751 | ||
752 | if (!strcmp(info->hardware_id.string, ids[i])) | |
637b9f1a | 753 | return true; |
2ef33ee7 RW |
754 | |
755 | if (!cid_list) | |
756 | continue; | |
757 | ||
758 | for (j = 0; j < cid_list->count; j++) { | |
759 | if (!strcmp(cid_list->ids[j].string, ids[i])) | |
760 | return true; | |
761 | } | |
637b9f1a HG |
762 | } |
763 | ||
764 | return false; | |
765 | } | |
766 | ||
767 | /* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */ | |
2ef33ee7 | 768 | static const char * const acpi_ignore_dep_ids[] = { |
2ef33ee7 | 769 | "PNP0D80", /* Windows-compatible System Power Management Controller */ |
9272e97a | 770 | "INT33BD", /* Intel Baytrail Mailbox Device */ |
637b9f1a HG |
771 | NULL |
772 | }; | |
773 | ||
5c478f49 BH |
774 | static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) |
775 | { | |
456de893 | 776 | struct acpi_device *device = NULL; |
5c478f49 | 777 | acpi_status status; |
5c478f49 BH |
778 | |
779 | /* | |
780 | * Fixed hardware devices do not appear in the namespace and do not | |
781 | * have handles, but we fabricate acpi_devices for them, so we have | |
782 | * to deal with them specially. | |
783 | */ | |
456de893 | 784 | if (!handle) |
5c478f49 BH |
785 | return acpi_root; |
786 | ||
787 | do { | |
788 | status = acpi_get_parent(handle, &handle); | |
5c478f49 | 789 | if (ACPI_FAILURE(status)) |
456de893 RW |
790 | return status == AE_NULL_ENTRY ? NULL : acpi_root; |
791 | } while (acpi_bus_get_device(handle, &device)); | |
792 | return device; | |
5c478f49 BH |
793 | } |
794 | ||
9e89dde2 ZR |
795 | acpi_status |
796 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) | |
797 | { | |
798 | acpi_status status; | |
799 | acpi_handle tmp; | |
800 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
801 | union acpi_object *obj; | |
802 | ||
803 | status = acpi_get_handle(handle, "_EJD", &tmp); | |
804 | if (ACPI_FAILURE(status)) | |
805 | return status; | |
806 | ||
807 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); | |
808 | if (ACPI_SUCCESS(status)) { | |
809 | obj = buffer.pointer; | |
3b5fee59 HM |
810 | status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, |
811 | ejd); | |
9e89dde2 ZR |
812 | kfree(buffer.pointer); |
813 | } | |
814 | return status; | |
815 | } | |
816 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); | |
817 | ||
40381a3c | 818 | static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev) |
9e89dde2 | 819 | { |
40381a3c BH |
820 | acpi_handle handle = dev->handle; |
821 | struct acpi_device_wakeup *wakeup = &dev->wakeup; | |
b581a7f9 RW |
822 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
823 | union acpi_object *package = NULL; | |
9e89dde2 | 824 | union acpi_object *element = NULL; |
b581a7f9 | 825 | acpi_status status; |
e88c9c60 | 826 | int err = -ENODATA; |
9e89dde2 | 827 | |
993cbe59 | 828 | INIT_LIST_HEAD(&wakeup->resources); |
9e89dde2 | 829 | |
b581a7f9 RW |
830 | /* _PRW */ |
831 | status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); | |
832 | if (ACPI_FAILURE(status)) { | |
833 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); | |
e88c9c60 | 834 | return err; |
b581a7f9 RW |
835 | } |
836 | ||
837 | package = (union acpi_object *)buffer.pointer; | |
838 | ||
e88c9c60 | 839 | if (!package || package->package.count < 2) |
b581a7f9 | 840 | goto out; |
b581a7f9 | 841 | |
9e89dde2 | 842 | element = &(package->package.elements[0]); |
e88c9c60 | 843 | if (!element) |
b581a7f9 | 844 | goto out; |
e88c9c60 | 845 | |
9e89dde2 ZR |
846 | if (element->type == ACPI_TYPE_PACKAGE) { |
847 | if ((element->package.count < 2) || | |
848 | (element->package.elements[0].type != | |
849 | ACPI_TYPE_LOCAL_REFERENCE) | |
e88c9c60 | 850 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
b581a7f9 | 851 | goto out; |
e88c9c60 | 852 | |
b581a7f9 | 853 | wakeup->gpe_device = |
9e89dde2 | 854 | element->package.elements[0].reference.handle; |
b581a7f9 | 855 | wakeup->gpe_number = |
9e89dde2 ZR |
856 | (u32) element->package.elements[1].integer.value; |
857 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
b581a7f9 RW |
858 | wakeup->gpe_device = NULL; |
859 | wakeup->gpe_number = element->integer.value; | |
860 | } else { | |
b581a7f9 RW |
861 | goto out; |
862 | } | |
9e89dde2 ZR |
863 | |
864 | element = &(package->package.elements[1]); | |
e88c9c60 | 865 | if (element->type != ACPI_TYPE_INTEGER) |
b581a7f9 | 866 | goto out; |
e88c9c60 | 867 | |
b581a7f9 | 868 | wakeup->sleep_state = element->integer.value; |
9e89dde2 | 869 | |
e88c9c60 RW |
870 | err = acpi_extract_power_resources(package, 2, &wakeup->resources); |
871 | if (err) | |
b581a7f9 | 872 | goto out; |
9e89dde2 | 873 | |
0596a52b RW |
874 | if (!list_empty(&wakeup->resources)) { |
875 | int sleep_state; | |
9e89dde2 | 876 | |
b5d667eb RW |
877 | err = acpi_power_wakeup_list_init(&wakeup->resources, |
878 | &sleep_state); | |
879 | if (err) { | |
880 | acpi_handle_warn(handle, "Retrieving current states " | |
881 | "of wakeup power resources failed\n"); | |
882 | acpi_power_resources_list_free(&wakeup->resources); | |
883 | goto out; | |
884 | } | |
0596a52b RW |
885 | if (sleep_state < wakeup->sleep_state) { |
886 | acpi_handle_warn(handle, "Overriding _PRW sleep state " | |
887 | "(S%d) by S%d from power resources\n", | |
888 | (int)wakeup->sleep_state, sleep_state); | |
889 | wakeup->sleep_state = sleep_state; | |
890 | } | |
891 | } | |
9874647b | 892 | |
b581a7f9 RW |
893 | out: |
894 | kfree(buffer.pointer); | |
e88c9c60 | 895 | return err; |
1da177e4 LT |
896 | } |
897 | ||
a1a66393 | 898 | static bool acpi_wakeup_gpe_init(struct acpi_device *device) |
1da177e4 | 899 | { |
0519ade7 | 900 | static const struct acpi_device_id button_device_ids[] = { |
5ceb5f05 BH |
901 | {"PNP0C0C", 0}, /* Power button */ |
902 | {"PNP0C0D", 0}, /* Lid */ | |
903 | {"PNP0C0E", 0}, /* Sleep button */ | |
29b71a1c TR |
904 | {"", 0}, |
905 | }; | |
bd9b2f9a | 906 | struct acpi_device_wakeup *wakeup = &device->wakeup; |
f517709d | 907 | acpi_status status; |
f517709d | 908 | |
bd9b2f9a | 909 | wakeup->flags.notifier_present = 0; |
f517709d RW |
910 | |
911 | /* Power button, Lid switch always enable wakeup */ | |
912 | if (!acpi_match_device_ids(device, button_device_ids)) { | |
b7e38304 ZR |
913 | if (!acpi_match_device_ids(device, &button_device_ids[1])) { |
914 | /* Do not use Lid/sleep button for S5 wakeup */ | |
bd9b2f9a RW |
915 | if (wakeup->sleep_state == ACPI_STATE_S5) |
916 | wakeup->sleep_state = ACPI_STATE_S4; | |
b7e38304 | 917 | } |
bd9b2f9a | 918 | acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number); |
f2b56bc8 | 919 | device_set_wakeup_capable(&device->dev, true); |
a1a66393 | 920 | return true; |
f517709d RW |
921 | } |
922 | ||
a1a66393 RW |
923 | status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device, |
924 | wakeup->gpe_number); | |
925 | return ACPI_SUCCESS(status); | |
f517709d RW |
926 | } |
927 | ||
d57d09a4 | 928 | static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
f517709d | 929 | { |
e88c9c60 | 930 | int err; |
29b71a1c | 931 | |
d57d09a4 | 932 | /* Presence of _PRW indicates wake capable */ |
952c63e9 | 933 | if (!acpi_has_method(device->handle, "_PRW")) |
d57d09a4 RW |
934 | return; |
935 | ||
40381a3c | 936 | err = acpi_bus_extract_wakeup_device_power_package(device); |
e88c9c60 RW |
937 | if (err) { |
938 | dev_err(&device->dev, "_PRW evaluation error: %d\n", err); | |
d57d09a4 | 939 | return; |
9e89dde2 | 940 | } |
1da177e4 | 941 | |
a1a66393 | 942 | device->wakeup.flags.valid = acpi_wakeup_gpe_init(device); |
9b83ccd2 | 943 | device->wakeup.prepare_count = 0; |
a1a66393 RW |
944 | /* |
945 | * Call _PSW/_DSW object to disable its ability to wake the sleeping | |
729b2bdb | 946 | * system for the ACPI device with the _PRW object. |
603fadf3 | 947 | * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW. |
729b2bdb ZY |
948 | * So it is necessary to call _DSW object first. Only when it is not |
949 | * present will the _PSW object used. | |
950 | */ | |
e88c9c60 RW |
951 | err = acpi_device_sleep_wake(device, 0, 0, 0); |
952 | if (err) | |
05de0686 | 953 | pr_debug("error in _DSW or _PSW evaluation\n"); |
1da177e4 | 954 | } |
1da177e4 | 955 | |
f33ce568 RW |
956 | static void acpi_bus_init_power_state(struct acpi_device *device, int state) |
957 | { | |
958 | struct acpi_device_power_state *ps = &device->power.states[state]; | |
ef85bdbe RW |
959 | char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; |
960 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
f33ce568 | 961 | acpi_status status; |
bf325f95 | 962 | |
f33ce568 RW |
963 | INIT_LIST_HEAD(&ps->resources); |
964 | ||
ef85bdbe RW |
965 | /* Evaluate "_PRx" to get referenced power resources */ |
966 | status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); | |
967 | if (ACPI_SUCCESS(status)) { | |
968 | union acpi_object *package = buffer.pointer; | |
969 | ||
970 | if (buffer.length && package | |
971 | && package->type == ACPI_TYPE_PACKAGE | |
956ad9d9 RW |
972 | && package->package.count) |
973 | acpi_extract_power_resources(package, 0, &ps->resources); | |
974 | ||
ef85bdbe | 975 | ACPI_FREE(buffer.pointer); |
f33ce568 RW |
976 | } |
977 | ||
978 | /* Evaluate "_PSx" to see if we can do explicit sets */ | |
ef85bdbe | 979 | pathname[2] = 'S'; |
952c63e9 | 980 | if (acpi_has_method(device->handle, pathname)) |
f33ce568 RW |
981 | ps->flags.explicit_set = 1; |
982 | ||
20dacb71 RW |
983 | /* State is valid if there are means to put the device into it. */ |
984 | if (!list_empty(&ps->resources) || ps->flags.explicit_set) | |
f33ce568 | 985 | ps->flags.valid = 1; |
f33ce568 RW |
986 | |
987 | ps->power = -1; /* Unknown - driver assigned */ | |
988 | ps->latency = -1; /* Unknown - driver assigned */ | |
989 | } | |
990 | ||
d43e167d | 991 | static void acpi_bus_get_power_flags(struct acpi_device *device) |
1da177e4 | 992 | { |
8bc5053b | 993 | u32 i; |
1a365616 | 994 | |
d43e167d | 995 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ |
952c63e9 JL |
996 | if (!acpi_has_method(device->handle, "_PS0") && |
997 | !acpi_has_method(device->handle, "_PR0")) | |
998 | return; | |
1a365616 | 999 | |
d43e167d | 1000 | device->flags.power_manageable = 1; |
4be44fcd | 1001 | |
9e89dde2 ZR |
1002 | /* |
1003 | * Power Management Flags | |
1004 | */ | |
952c63e9 | 1005 | if (acpi_has_method(device->handle, "_PSC")) |
9e89dde2 | 1006 | device->power.flags.explicit_get = 1; |
f25c0ae2 | 1007 | |
952c63e9 | 1008 | if (acpi_has_method(device->handle, "_IRC")) |
9e89dde2 | 1009 | device->power.flags.inrush_current = 1; |
1da177e4 | 1010 | |
f25c0ae2 RW |
1011 | if (acpi_has_method(device->handle, "_DSW")) |
1012 | device->power.flags.dsw_present = 1; | |
1013 | ||
9e89dde2 ZR |
1014 | /* |
1015 | * Enumerate supported power management states | |
1016 | */ | |
f33ce568 RW |
1017 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) |
1018 | acpi_bus_init_power_state(device, i); | |
bf325f95 | 1019 | |
0b224527 | 1020 | INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); |
1da177e4 | 1021 | |
956ad9d9 | 1022 | /* Set the defaults for D0 and D3hot (always supported). */ |
9e89dde2 ZR |
1023 | device->power.states[ACPI_STATE_D0].flags.valid = 1; |
1024 | device->power.states[ACPI_STATE_D0].power = 100; | |
20dacb71 | 1025 | device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1; |
1399dfcd | 1026 | |
956ad9d9 RW |
1027 | /* |
1028 | * Use power resources only if the D0 list of them is populated, because | |
1029 | * some platforms may provide _PR3 only to indicate D3cold support and | |
1030 | * in those cases the power resources list returned by it may be bogus. | |
1031 | */ | |
1032 | if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) { | |
1033 | device->power.flags.power_resources = 1; | |
1034 | /* | |
1035 | * D3cold is supported if the D3hot list of power resources is | |
1036 | * not empty. | |
1037 | */ | |
1038 | if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources)) | |
1039 | device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; | |
1040 | } | |
1041 | ||
1b1f3e16 | 1042 | if (acpi_bus_init_power(device)) |
b3785492 | 1043 | device->flags.power_manageable = 0; |
9e89dde2 | 1044 | } |
c8f7a62c | 1045 | |
d43e167d | 1046 | static void acpi_bus_get_flags(struct acpi_device *device) |
1da177e4 | 1047 | { |
1da177e4 | 1048 | /* Presence of _STA indicates 'dynamic_status' */ |
952c63e9 | 1049 | if (acpi_has_method(device->handle, "_STA")) |
1da177e4 LT |
1050 | device->flags.dynamic_status = 1; |
1051 | ||
1da177e4 | 1052 | /* Presence of _RMV indicates 'removable' */ |
952c63e9 | 1053 | if (acpi_has_method(device->handle, "_RMV")) |
1da177e4 LT |
1054 | device->flags.removable = 1; |
1055 | ||
1056 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ | |
952c63e9 JL |
1057 | if (acpi_has_method(device->handle, "_EJD") || |
1058 | acpi_has_method(device->handle, "_EJ0")) | |
1da177e4 | 1059 | device->flags.ejectable = 1; |
1da177e4 LT |
1060 | } |
1061 | ||
c7bcb4e9 | 1062 | static void acpi_device_get_busid(struct acpi_device *device) |
1da177e4 | 1063 | { |
4be44fcd LB |
1064 | char bus_id[5] = { '?', 0 }; |
1065 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; | |
1066 | int i = 0; | |
1da177e4 LT |
1067 | |
1068 | /* | |
1069 | * Bus ID | |
1070 | * ------ | |
1071 | * The device's Bus ID is simply the object name. | |
1072 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? | |
1073 | */ | |
859ac9a4 | 1074 | if (ACPI_IS_ROOT_DEVICE(device)) { |
1da177e4 | 1075 | strcpy(device->pnp.bus_id, "ACPI"); |
859ac9a4 BH |
1076 | return; |
1077 | } | |
1078 | ||
1079 | switch (device->device_type) { | |
1da177e4 LT |
1080 | case ACPI_BUS_TYPE_POWER_BUTTON: |
1081 | strcpy(device->pnp.bus_id, "PWRF"); | |
1082 | break; | |
1083 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
1084 | strcpy(device->pnp.bus_id, "SLPF"); | |
1085 | break; | |
a64a62ce LZ |
1086 | case ACPI_BUS_TYPE_ECDT_EC: |
1087 | strcpy(device->pnp.bus_id, "ECDT"); | |
1088 | break; | |
1da177e4 | 1089 | default: |
66b7ed40 | 1090 | acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); |
1da177e4 LT |
1091 | /* Clean up trailing underscores (if any) */ |
1092 | for (i = 3; i > 1; i--) { | |
1093 | if (bus_id[i] == '_') | |
1094 | bus_id[i] = '\0'; | |
1095 | else | |
1096 | break; | |
1097 | } | |
1098 | strcpy(device->pnp.bus_id, bus_id); | |
1099 | break; | |
1100 | } | |
1101 | } | |
1102 | ||
ebf4df8d JL |
1103 | /* |
1104 | * acpi_ata_match - see if an acpi object is an ATA device | |
1105 | * | |
1106 | * If an acpi object has one of the ACPI ATA methods defined, | |
1107 | * then we can safely call it an ATA device. | |
1108 | */ | |
1109 | bool acpi_ata_match(acpi_handle handle) | |
1110 | { | |
1111 | return acpi_has_method(handle, "_GTF") || | |
1112 | acpi_has_method(handle, "_GTM") || | |
1113 | acpi_has_method(handle, "_STM") || | |
1114 | acpi_has_method(handle, "_SDD"); | |
1115 | } | |
1116 | ||
54735266 | 1117 | /* |
d4e1a692 | 1118 | * acpi_bay_match - see if an acpi object is an ejectable driver bay |
54735266 ZR |
1119 | * |
1120 | * If an acpi object is ejectable and has one of the ACPI ATA methods defined, | |
1121 | * then we can safely call it an ejectable drive bay | |
1122 | */ | |
ebf4df8d | 1123 | bool acpi_bay_match(acpi_handle handle) |
d4e1a692 | 1124 | { |
54735266 ZR |
1125 | acpi_handle phandle; |
1126 | ||
952c63e9 | 1127 | if (!acpi_has_method(handle, "_EJ0")) |
ebf4df8d JL |
1128 | return false; |
1129 | if (acpi_ata_match(handle)) | |
1130 | return true; | |
1131 | if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) | |
1132 | return false; | |
54735266 | 1133 | |
ebf4df8d | 1134 | return acpi_ata_match(phandle); |
54735266 ZR |
1135 | } |
1136 | ||
b43109fa | 1137 | bool acpi_device_is_battery(struct acpi_device *adev) |
1e2380cd | 1138 | { |
b43109fa | 1139 | struct acpi_hardware_id *hwid; |
1e2380cd | 1140 | |
b43109fa RW |
1141 | list_for_each_entry(hwid, &adev->pnp.ids, list) |
1142 | if (!strcmp("PNP0C0A", hwid->id)) | |
1143 | return true; | |
1e2380cd | 1144 | |
b43109fa | 1145 | return false; |
1e2380cd RW |
1146 | } |
1147 | ||
b43109fa | 1148 | static bool is_ejectable_bay(struct acpi_device *adev) |
1e2380cd | 1149 | { |
b43109fa RW |
1150 | acpi_handle handle = adev->handle; |
1151 | ||
1152 | if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev)) | |
1e2380cd RW |
1153 | return true; |
1154 | ||
1155 | return acpi_bay_match(handle); | |
1156 | } | |
1157 | ||
3620f2f2 | 1158 | /* |
d4e1a692 | 1159 | * acpi_dock_match - see if an acpi object has a _DCK method |
3620f2f2 | 1160 | */ |
ebf4df8d | 1161 | bool acpi_dock_match(acpi_handle handle) |
3620f2f2 | 1162 | { |
ebf4df8d | 1163 | return acpi_has_method(handle, "_DCK"); |
3620f2f2 FS |
1164 | } |
1165 | ||
adc8bb8e HG |
1166 | static acpi_status |
1167 | acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context, | |
1168 | void **return_value) | |
1169 | { | |
1170 | long *cap = context; | |
1171 | ||
1172 | if (acpi_has_method(handle, "_BCM") && | |
1173 | acpi_has_method(handle, "_BCL")) { | |
1174 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight " | |
1175 | "support\n")); | |
1176 | *cap |= ACPI_VIDEO_BACKLIGHT; | |
adc8bb8e HG |
1177 | /* We have backlight support, no need to scan further */ |
1178 | return AE_CTRL_TERMINATE; | |
1179 | } | |
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | /* Returns true if the ACPI object is a video device which can be | |
1184 | * handled by video.ko. | |
1185 | * The device will get a Linux specific CID added in scan.c to | |
1186 | * identify the device as an ACPI graphics device | |
1187 | * Be aware that the graphics device may not be physically present | |
1188 | * Use acpi_video_get_capabilities() to detect general ACPI video | |
1189 | * capabilities of present cards | |
1190 | */ | |
1191 | long acpi_is_video_device(acpi_handle handle) | |
1192 | { | |
1193 | long video_caps = 0; | |
1194 | ||
1195 | /* Is this device able to support video switching ? */ | |
1196 | if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS")) | |
1197 | video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING; | |
1198 | ||
1199 | /* Is this device able to retrieve a video ROM ? */ | |
1200 | if (acpi_has_method(handle, "_ROM")) | |
1201 | video_caps |= ACPI_VIDEO_ROM_AVAILABLE; | |
1202 | ||
1203 | /* Is this device able to configure which video head to be POSTed ? */ | |
1204 | if (acpi_has_method(handle, "_VPO") && | |
1205 | acpi_has_method(handle, "_GPD") && | |
1206 | acpi_has_method(handle, "_SPD")) | |
1207 | video_caps |= ACPI_VIDEO_DEVICE_POSTING; | |
1208 | ||
1209 | /* Only check for backlight functionality if one of the above hit. */ | |
1210 | if (video_caps) | |
1211 | acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, | |
1212 | ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL, | |
1213 | &video_caps, NULL); | |
1214 | ||
1215 | return video_caps; | |
1216 | } | |
1217 | EXPORT_SYMBOL(acpi_is_video_device); | |
1218 | ||
620e112c | 1219 | const char *acpi_device_hid(struct acpi_device *device) |
15b8dd53 | 1220 | { |
7f47fa6c | 1221 | struct acpi_hardware_id *hid; |
15b8dd53 | 1222 | |
2b2ae7c7 TR |
1223 | if (list_empty(&device->pnp.ids)) |
1224 | return dummy_hid; | |
1225 | ||
7f47fa6c BH |
1226 | hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); |
1227 | return hid->id; | |
1228 | } | |
1229 | EXPORT_SYMBOL(acpi_device_hid); | |
15b8dd53 | 1230 | |
d4e1a692 | 1231 | static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) |
7f47fa6c BH |
1232 | { |
1233 | struct acpi_hardware_id *id; | |
15b8dd53 | 1234 | |
7f47fa6c BH |
1235 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
1236 | if (!id) | |
1237 | return; | |
15b8dd53 | 1238 | |
6a0d12ef | 1239 | id->id = kstrdup_const(dev_id, GFP_KERNEL); |
7f47fa6c BH |
1240 | if (!id->id) { |
1241 | kfree(id); | |
1242 | return; | |
15b8dd53 BM |
1243 | } |
1244 | ||
d4e1a692 TK |
1245 | list_add_tail(&id->list, &pnp->ids); |
1246 | pnp->type.hardware_id = 1; | |
15b8dd53 BM |
1247 | } |
1248 | ||
222e82ac DW |
1249 | /* |
1250 | * Old IBM workstations have a DSDT bug wherein the SMBus object | |
1251 | * lacks the SMBUS01 HID and the methods do not have the necessary "_" | |
1252 | * prefix. Work around this. | |
1253 | */ | |
ebf4df8d | 1254 | static bool acpi_ibm_smbus_match(acpi_handle handle) |
222e82ac | 1255 | { |
ebf4df8d JL |
1256 | char node_name[ACPI_PATH_SEGMENT_LENGTH]; |
1257 | struct acpi_buffer path = { sizeof(node_name), node_name }; | |
222e82ac DW |
1258 | |
1259 | if (!dmi_name_in_vendors("IBM")) | |
ebf4df8d | 1260 | return false; |
222e82ac DW |
1261 | |
1262 | /* Look for SMBS object */ | |
ebf4df8d JL |
1263 | if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || |
1264 | strcmp("SMBS", path.pointer)) | |
1265 | return false; | |
222e82ac DW |
1266 | |
1267 | /* Does it have the necessary (but misnamed) methods? */ | |
952c63e9 JL |
1268 | if (acpi_has_method(handle, "SBI") && |
1269 | acpi_has_method(handle, "SBR") && | |
1270 | acpi_has_method(handle, "SBW")) | |
ebf4df8d JL |
1271 | return true; |
1272 | ||
1273 | return false; | |
222e82ac DW |
1274 | } |
1275 | ||
ae3caa80 JL |
1276 | static bool acpi_object_is_system_bus(acpi_handle handle) |
1277 | { | |
1278 | acpi_handle tmp; | |
1279 | ||
1280 | if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) && | |
1281 | tmp == handle) | |
1282 | return true; | |
1283 | if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) && | |
1284 | tmp == handle) | |
1285 | return true; | |
1286 | ||
1287 | return false; | |
1288 | } | |
1289 | ||
c0af4175 | 1290 | static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, |
6091b263 | 1291 | int device_type, struct acpi_device_info *info) |
1da177e4 | 1292 | { |
78e25fef | 1293 | struct acpi_pnp_device_id_list *cid_list; |
7f47fa6c | 1294 | int i; |
1da177e4 | 1295 | |
c0af4175 | 1296 | switch (device_type) { |
1da177e4 | 1297 | case ACPI_BUS_TYPE_DEVICE: |
c0af4175 TK |
1298 | if (handle == ACPI_ROOT_OBJECT) { |
1299 | acpi_add_id(pnp, ACPI_SYSTEM_HID); | |
859ac9a4 BH |
1300 | break; |
1301 | } | |
1302 | ||
6091b263 | 1303 | if (!info) { |
c0af4175 TK |
1304 | pr_err(PREFIX "%s: Error reading device info\n", |
1305 | __func__); | |
1da177e4 LT |
1306 | return; |
1307 | } | |
1308 | ||
549e6845 | 1309 | if (info->valid & ACPI_VALID_HID) { |
c0af4175 | 1310 | acpi_add_id(pnp, info->hardware_id.string); |
549e6845 RW |
1311 | pnp->type.platform_id = 1; |
1312 | } | |
57f3674f | 1313 | if (info->valid & ACPI_VALID_CID) { |
15b8dd53 | 1314 | cid_list = &info->compatible_id_list; |
57f3674f | 1315 | for (i = 0; i < cid_list->count; i++) |
c0af4175 | 1316 | acpi_add_id(pnp, cid_list->ids[i].string); |
57f3674f | 1317 | } |
1da177e4 | 1318 | if (info->valid & ACPI_VALID_ADR) { |
c0af4175 TK |
1319 | pnp->bus_address = info->address; |
1320 | pnp->type.bus_address = 1; | |
1da177e4 | 1321 | } |
ccf78040 | 1322 | if (info->valid & ACPI_VALID_UID) |
c0af4175 | 1323 | pnp->unique_id = kstrdup(info->unique_id.string, |
ccf78040 | 1324 | GFP_KERNEL); |
26095a01 SS |
1325 | if (info->valid & ACPI_VALID_CLS) |
1326 | acpi_add_id(pnp, info->class_code.string); | |
ae843332 | 1327 | |
57f3674f BH |
1328 | /* |
1329 | * Some devices don't reliably have _HIDs & _CIDs, so add | |
1330 | * synthetic HIDs to make sure drivers can find them. | |
1331 | */ | |
c0af4175 TK |
1332 | if (acpi_is_video_device(handle)) |
1333 | acpi_add_id(pnp, ACPI_VIDEO_HID); | |
ebf4df8d | 1334 | else if (acpi_bay_match(handle)) |
c0af4175 | 1335 | acpi_add_id(pnp, ACPI_BAY_HID); |
ebf4df8d | 1336 | else if (acpi_dock_match(handle)) |
c0af4175 | 1337 | acpi_add_id(pnp, ACPI_DOCK_HID); |
ebf4df8d | 1338 | else if (acpi_ibm_smbus_match(handle)) |
c0af4175 | 1339 | acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); |
ae3caa80 JL |
1340 | else if (list_empty(&pnp->ids) && |
1341 | acpi_object_is_system_bus(handle)) { | |
1342 | /* \_SB, \_TZ, LNXSYBUS */ | |
1343 | acpi_add_id(pnp, ACPI_BUS_HID); | |
c0af4175 TK |
1344 | strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); |
1345 | strcpy(pnp->device_class, ACPI_BUS_CLASS); | |
b7b30de5 | 1346 | } |
54735266 | 1347 | |
1da177e4 LT |
1348 | break; |
1349 | case ACPI_BUS_TYPE_POWER: | |
c0af4175 | 1350 | acpi_add_id(pnp, ACPI_POWER_HID); |
1da177e4 LT |
1351 | break; |
1352 | case ACPI_BUS_TYPE_PROCESSOR: | |
c0af4175 | 1353 | acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); |
1da177e4 | 1354 | break; |
1da177e4 | 1355 | case ACPI_BUS_TYPE_THERMAL: |
c0af4175 | 1356 | acpi_add_id(pnp, ACPI_THERMAL_HID); |
1da177e4 LT |
1357 | break; |
1358 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
c0af4175 | 1359 | acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); |
1da177e4 LT |
1360 | break; |
1361 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
c0af4175 | 1362 | acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); |
1da177e4 | 1363 | break; |
a64a62ce LZ |
1364 | case ACPI_BUS_TYPE_ECDT_EC: |
1365 | acpi_add_id(pnp, ACPI_ECDT_HID); | |
1366 | break; | |
1da177e4 | 1367 | } |
1da177e4 LT |
1368 | } |
1369 | ||
c0af4175 TK |
1370 | void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) |
1371 | { | |
1372 | struct acpi_hardware_id *id, *tmp; | |
1373 | ||
1374 | list_for_each_entry_safe(id, tmp, &pnp->ids, list) { | |
6a0d12ef | 1375 | kfree_const(id->id); |
c0af4175 TK |
1376 | kfree(id); |
1377 | } | |
1378 | kfree(pnp->unique_id); | |
1379 | } | |
1380 | ||
b84f196d SS |
1381 | /** |
1382 | * acpi_dma_supported - Check DMA support for the specified device. | |
1383 | * @adev: The pointer to acpi device | |
1384 | * | |
1385 | * Return false if DMA is not supported. Otherwise, return true | |
1386 | */ | |
1387 | bool acpi_dma_supported(struct acpi_device *adev) | |
1388 | { | |
1389 | if (!adev) | |
1390 | return false; | |
1391 | ||
1392 | if (adev->flags.cca_seen) | |
1393 | return true; | |
1394 | ||
1395 | /* | |
1396 | * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent | |
1397 | * DMA on "Intel platforms". Presumably that includes all x86 and | |
1398 | * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y. | |
1399 | */ | |
1400 | if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED)) | |
1401 | return true; | |
1402 | ||
1403 | return false; | |
1404 | } | |
1405 | ||
1406 | /** | |
1407 | * acpi_get_dma_attr - Check the supported DMA attr for the specified device. | |
1408 | * @adev: The pointer to acpi device | |
1409 | * | |
1410 | * Return enum dev_dma_attr. | |
1411 | */ | |
1412 | enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev) | |
1413 | { | |
1414 | if (!acpi_dma_supported(adev)) | |
1415 | return DEV_DMA_NOT_SUPPORTED; | |
1416 | ||
1417 | if (adev->flags.coherent_dma) | |
1418 | return DEV_DMA_COHERENT; | |
1419 | else | |
1420 | return DEV_DMA_NON_COHERENT; | |
1421 | } | |
1422 | ||
c04ac679 LP |
1423 | /** |
1424 | * acpi_dma_get_range() - Get device DMA parameters. | |
1425 | * | |
1426 | * @dev: device to configure | |
1427 | * @dma_addr: pointer device DMA address result | |
1428 | * @offset: pointer to the DMA offset result | |
1429 | * @size: pointer to DMA range size result | |
1430 | * | |
1431 | * Evaluate DMA regions and return respectively DMA region start, offset | |
1432 | * and size in dma_addr, offset and size on parsing success; it does not | |
1433 | * update the passed in values on failure. | |
1434 | * | |
1435 | * Return 0 on success, < 0 on failure. | |
1436 | */ | |
1437 | int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset, | |
1438 | u64 *size) | |
1439 | { | |
1440 | struct acpi_device *adev; | |
1441 | LIST_HEAD(list); | |
1442 | struct resource_entry *rentry; | |
1443 | int ret; | |
1444 | struct device *dma_dev = dev; | |
1445 | u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0; | |
1446 | ||
1447 | /* | |
1448 | * Walk the device tree chasing an ACPI companion with a _DMA | |
1449 | * object while we go. Stop if we find a device with an ACPI | |
1450 | * companion containing a _DMA method. | |
1451 | */ | |
1452 | do { | |
1453 | adev = ACPI_COMPANION(dma_dev); | |
1454 | if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA)) | |
1455 | break; | |
1456 | ||
1457 | dma_dev = dma_dev->parent; | |
1458 | } while (dma_dev); | |
1459 | ||
1460 | if (!dma_dev) | |
1461 | return -ENODEV; | |
1462 | ||
1463 | if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) { | |
1464 | acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n"); | |
1465 | return -EINVAL; | |
1466 | } | |
1467 | ||
1468 | ret = acpi_dev_get_dma_resources(adev, &list); | |
1469 | if (ret > 0) { | |
1470 | list_for_each_entry(rentry, &list, node) { | |
1471 | if (dma_offset && rentry->offset != dma_offset) { | |
1472 | ret = -EINVAL; | |
1473 | dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n"); | |
1474 | goto out; | |
1475 | } | |
1476 | dma_offset = rentry->offset; | |
1477 | ||
1478 | /* Take lower and upper limits */ | |
1479 | if (rentry->res->start < dma_start) | |
1480 | dma_start = rentry->res->start; | |
1481 | if (rentry->res->end > dma_end) | |
1482 | dma_end = rentry->res->end; | |
1483 | } | |
1484 | ||
1485 | if (dma_start >= dma_end) { | |
1486 | ret = -EINVAL; | |
1487 | dev_dbg(dma_dev, "Invalid DMA regions configuration\n"); | |
1488 | goto out; | |
1489 | } | |
1490 | ||
1491 | *dma_addr = dma_start - dma_offset; | |
1492 | len = dma_end - dma_start; | |
1493 | *size = max(len, len + 1); | |
1494 | *offset = dma_offset; | |
1495 | } | |
1496 | out: | |
1497 | acpi_dev_free_resource_list(&list); | |
1498 | ||
1499 | return ret >= 0 ? 0 : ret; | |
1500 | } | |
1501 | ||
d760a1ba | 1502 | /** |
c1e97359 | 1503 | * acpi_dma_configure_id - Set-up DMA configuration for the device. |
d760a1ba LP |
1504 | * @dev: The pointer to the device |
1505 | * @attr: device dma attributes | |
b8e069a2 | 1506 | * @input_id: input device id const value pointer |
d760a1ba | 1507 | */ |
b8e069a2 LP |
1508 | int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, |
1509 | const u32 *input_id) | |
d760a1ba | 1510 | { |
643b8e4d | 1511 | const struct iommu_ops *iommu; |
7ad42639 | 1512 | u64 dma_addr = 0, size = 0; |
643b8e4d | 1513 | |
e5361ca2 RM |
1514 | if (attr == DEV_DMA_NOT_SUPPORTED) { |
1515 | set_dma_ops(dev, &dma_dummy_ops); | |
1516 | return 0; | |
1517 | } | |
1518 | ||
7ad42639 | 1519 | iort_dma_setup(dev, &dma_addr, &size); |
d760a1ba | 1520 | |
b8e069a2 | 1521 | iommu = iort_iommu_configure_id(dev, input_id); |
45586c70 | 1522 | if (PTR_ERR(iommu) == -EPROBE_DEFER) |
058f8c3f | 1523 | return -EPROBE_DEFER; |
643b8e4d | 1524 | |
7ad42639 LP |
1525 | arch_setup_dma_ops(dev, dma_addr, size, |
1526 | iommu, attr == DEV_DMA_COHERENT); | |
5a1bb638 S |
1527 | |
1528 | return 0; | |
d760a1ba | 1529 | } |
b8e069a2 | 1530 | EXPORT_SYMBOL_GPL(acpi_dma_configure_id); |
d760a1ba | 1531 | |
d0562674 SS |
1532 | static void acpi_init_coherency(struct acpi_device *adev) |
1533 | { | |
1534 | unsigned long long cca = 0; | |
1535 | acpi_status status; | |
1536 | struct acpi_device *parent = adev->parent; | |
1537 | ||
1538 | if (parent && parent->flags.cca_seen) { | |
1539 | /* | |
1540 | * From ACPI spec, OSPM will ignore _CCA if an ancestor | |
1541 | * already saw one. | |
1542 | */ | |
1543 | adev->flags.cca_seen = 1; | |
1544 | cca = parent->flags.coherent_dma; | |
1545 | } else { | |
1546 | status = acpi_evaluate_integer(adev->handle, "_CCA", | |
1547 | NULL, &cca); | |
1548 | if (ACPI_SUCCESS(status)) | |
1549 | adev->flags.cca_seen = 1; | |
1550 | else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED)) | |
1551 | /* | |
1552 | * If architecture does not specify that _CCA is | |
1553 | * required for DMA-able devices (e.g. x86), | |
1554 | * we default to _CCA=1. | |
1555 | */ | |
1556 | cca = 1; | |
1557 | else | |
1558 | acpi_handle_debug(adev->handle, | |
1559 | "ACPI device is missing _CCA.\n"); | |
1560 | } | |
1561 | ||
1562 | adev->flags.coherent_dma = cca; | |
1563 | } | |
1564 | ||
e361d1f8 | 1565 | static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data) |
e4330d8b | 1566 | { |
e361d1f8 | 1567 | bool *is_serial_bus_slave_p = data; |
e4330d8b JN |
1568 | |
1569 | if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) | |
1570 | return 1; | |
1571 | ||
e361d1f8 | 1572 | *is_serial_bus_slave_p = true; |
e4330d8b JN |
1573 | |
1574 | /* no need to do more checking */ | |
1575 | return -1; | |
1576 | } | |
1577 | ||
dfda4492 JG |
1578 | static bool acpi_is_indirect_io_slave(struct acpi_device *device) |
1579 | { | |
1580 | struct acpi_device *parent = device->parent; | |
a6f07295 | 1581 | static const struct acpi_device_id indirect_io_hosts[] = { |
dfda4492 JG |
1582 | {"HISI0191", 0}, |
1583 | {} | |
1584 | }; | |
1585 | ||
1586 | return parent && !acpi_match_device_ids(parent, indirect_io_hosts); | |
1587 | } | |
1588 | ||
d87fb091 | 1589 | static bool acpi_device_enumeration_by_parent(struct acpi_device *device) |
e4330d8b JN |
1590 | { |
1591 | struct list_head resource_list; | |
e361d1f8 | 1592 | bool is_serial_bus_slave = false; |
aba94139 HG |
1593 | /* |
1594 | * These devices have multiple I2cSerialBus resources and an i2c-client | |
1595 | * must be instantiated for each, each with its own i2c_device_id. | |
1596 | * Normally we only instantiate an i2c-client for the first resource, | |
1597 | * using the ACPI HID as id. These special cases are handled by the | |
1598 | * drivers/platform/x86/i2c-multi-instantiate.c driver, which knows | |
1599 | * which i2c_device_id to use for each resource. | |
1600 | */ | |
1601 | static const struct acpi_device_id i2c_multi_instantiate_ids[] = { | |
1602 | {"BSG1160", }, | |
96f984d3 | 1603 | {"BSG2150", }, |
589edb56 | 1604 | {"INT33FE", }, |
a3dd034a | 1605 | {"INT3515", }, |
aba94139 HG |
1606 | {} |
1607 | }; | |
e4330d8b | 1608 | |
dfda4492 JG |
1609 | if (acpi_is_indirect_io_slave(device)) |
1610 | return true; | |
1611 | ||
ca9ef3ab LW |
1612 | /* Macs use device properties in lieu of _CRS resources */ |
1613 | if (x86_apple_machine && | |
1614 | (fwnode_property_present(&device->fwnode, "spiSclkPeriod") || | |
e361d1f8 FD |
1615 | fwnode_property_present(&device->fwnode, "i2cAddress") || |
1616 | fwnode_property_present(&device->fwnode, "baud"))) | |
ca9ef3ab LW |
1617 | return true; |
1618 | ||
aba94139 HG |
1619 | /* Instantiate a pdev for the i2c-multi-instantiate drv to bind to */ |
1620 | if (!acpi_match_device_ids(device, i2c_multi_instantiate_ids)) | |
1621 | return false; | |
1622 | ||
e4330d8b | 1623 | INIT_LIST_HEAD(&resource_list); |
e361d1f8 FD |
1624 | acpi_dev_get_resources(device, &resource_list, |
1625 | acpi_check_serial_bus_slave, | |
1626 | &is_serial_bus_slave); | |
e4330d8b JN |
1627 | acpi_dev_free_resource_list(&resource_list); |
1628 | ||
e361d1f8 | 1629 | return is_serial_bus_slave; |
e4330d8b JN |
1630 | } |
1631 | ||
82c7d5ef | 1632 | void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, |
6091b263 HG |
1633 | int type, unsigned long long sta, |
1634 | struct acpi_device_info *info) | |
1da177e4 | 1635 | { |
d43e167d RW |
1636 | INIT_LIST_HEAD(&device->pnp.ids); |
1637 | device->device_type = type; | |
1638 | device->handle = handle; | |
1639 | device->parent = acpi_bus_get_parent(handle); | |
01bb86b3 | 1640 | fwnode_init(&device->fwnode, &acpi_device_fwnode_ops); |
25db115b | 1641 | acpi_set_device_status(device, sta); |
d43e167d | 1642 | acpi_device_get_busid(device); |
6091b263 | 1643 | acpi_set_pnp_ids(handle, &device->pnp, type, info); |
ffdcd955 | 1644 | acpi_init_properties(device); |
d43e167d | 1645 | acpi_bus_get_flags(device); |
2c0d4fe0 | 1646 | device->flags.match_driver = false; |
202317a5 | 1647 | device->flags.initialized = true; |
d87fb091 JG |
1648 | device->flags.enumeration_by_parent = |
1649 | acpi_device_enumeration_by_parent(device); | |
10c7e20b | 1650 | acpi_device_clear_enumerated(device); |
cf860be6 RW |
1651 | device_initialize(&device->dev); |
1652 | dev_set_uevent_suppress(&device->dev, true); | |
d0562674 | 1653 | acpi_init_coherency(device); |
cf860be6 | 1654 | } |
bc3b0772 | 1655 | |
cf860be6 RW |
1656 | void acpi_device_add_finalize(struct acpi_device *device) |
1657 | { | |
1658 | dev_set_uevent_suppress(&device->dev, false); | |
1659 | kobject_uevent(&device->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
1660 | } |
1661 | ||
5c478f49 BH |
1662 | static int acpi_add_single_object(struct acpi_device **child, |
1663 | acpi_handle handle, int type, | |
2c0d4fe0 | 1664 | unsigned long long sta) |
1da177e4 | 1665 | { |
77c24888 BH |
1666 | int result; |
1667 | struct acpi_device *device; | |
29aaefa6 | 1668 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
6091b263 HG |
1669 | struct acpi_device_info *info = NULL; |
1670 | ||
1671 | if (handle != ACPI_ROOT_OBJECT && type == ACPI_BUS_TYPE_DEVICE) | |
1672 | acpi_get_object_info(handle, &info); | |
1da177e4 | 1673 | |
36bcbec7 | 1674 | device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
1da177e4 | 1675 | if (!device) { |
6468463a | 1676 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
6091b263 | 1677 | kfree(info); |
d550d98d | 1678 | return -ENOMEM; |
1da177e4 | 1679 | } |
1da177e4 | 1680 | |
6091b263 HG |
1681 | acpi_init_device_object(device, handle, type, sta, info); |
1682 | kfree(info); | |
63347db0 HG |
1683 | /* |
1684 | * For ACPI_BUS_TYPE_DEVICE getting the status is delayed till here so | |
1685 | * that we can call acpi_bus_get_status() and use its quirk handling. | |
1686 | * Note this must be done before the get power-/wakeup_dev-flags calls. | |
1687 | */ | |
1688 | if (type == ACPI_BUS_TYPE_DEVICE) | |
5971b0c1 HG |
1689 | if (acpi_bus_get_status(device) < 0) |
1690 | acpi_set_device_status(device, 0); | |
63347db0 | 1691 | |
d43e167d | 1692 | acpi_bus_get_power_flags(device); |
d57d09a4 | 1693 | acpi_bus_get_wakeup_device_flags(device); |
1da177e4 | 1694 | |
cf860be6 | 1695 | result = acpi_device_add(device, acpi_device_release); |
d43e167d | 1696 | if (result) { |
718fb0de | 1697 | acpi_device_release(&device->dev); |
d43e167d RW |
1698 | return result; |
1699 | } | |
1da177e4 | 1700 | |
d43e167d | 1701 | acpi_power_add_remove_device(device, true); |
cf860be6 | 1702 | acpi_device_add_finalize(device); |
d43e167d RW |
1703 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
1704 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n", | |
1705 | dev_name(&device->dev), (char *) buffer.pointer, | |
1706 | device->parent ? dev_name(&device->parent->dev) : "(null)")); | |
1707 | kfree(buffer.pointer); | |
1708 | *child = device; | |
1709 | return 0; | |
bf325f95 RW |
1710 | } |
1711 | ||
a4e081b0 SZ |
1712 | static acpi_status acpi_get_resource_memory(struct acpi_resource *ares, |
1713 | void *context) | |
1714 | { | |
1715 | struct resource *res = context; | |
1716 | ||
1717 | if (acpi_dev_resource_memory(ares, res)) | |
1718 | return AE_CTRL_TERMINATE; | |
1719 | ||
1720 | return AE_OK; | |
1721 | } | |
1722 | ||
1723 | static bool acpi_device_should_be_hidden(acpi_handle handle) | |
1724 | { | |
1725 | acpi_status status; | |
1726 | struct resource res; | |
1727 | ||
1728 | /* Check if it should ignore the UART device */ | |
1729 | if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS))) | |
1730 | return false; | |
1731 | ||
1732 | /* | |
1733 | * The UART device described in SPCR table is assumed to have only one | |
1734 | * memory resource present. So we only look for the first one here. | |
1735 | */ | |
1736 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
1737 | acpi_get_resource_memory, &res); | |
1738 | if (ACPI_FAILURE(status) || res.start != spcr_uart_addr) | |
1739 | return false; | |
1740 | ||
1741 | acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n", | |
1742 | &res.start); | |
1743 | ||
1744 | return true; | |
1745 | } | |
1746 | ||
778cbc1d BH |
1747 | static int acpi_bus_type_and_status(acpi_handle handle, int *type, |
1748 | unsigned long long *sta) | |
1da177e4 | 1749 | { |
778cbc1d BH |
1750 | acpi_status status; |
1751 | acpi_object_type acpi_type; | |
1da177e4 | 1752 | |
778cbc1d | 1753 | status = acpi_get_type(handle, &acpi_type); |
51a85faf | 1754 | if (ACPI_FAILURE(status)) |
778cbc1d | 1755 | return -ENODEV; |
4be44fcd | 1756 | |
778cbc1d | 1757 | switch (acpi_type) { |
51a85faf BH |
1758 | case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ |
1759 | case ACPI_TYPE_DEVICE: | |
a4e081b0 SZ |
1760 | if (acpi_device_should_be_hidden(handle)) |
1761 | return -ENODEV; | |
1762 | ||
778cbc1d | 1763 | *type = ACPI_BUS_TYPE_DEVICE; |
63347db0 HG |
1764 | /* |
1765 | * acpi_add_single_object updates this once we've an acpi_device | |
1766 | * so that acpi_bus_get_status' quirk handling can be used. | |
1767 | */ | |
5971b0c1 | 1768 | *sta = ACPI_STA_DEFAULT; |
51a85faf BH |
1769 | break; |
1770 | case ACPI_TYPE_PROCESSOR: | |
778cbc1d BH |
1771 | *type = ACPI_BUS_TYPE_PROCESSOR; |
1772 | status = acpi_bus_get_status_handle(handle, sta); | |
1773 | if (ACPI_FAILURE(status)) | |
1774 | return -ENODEV; | |
51a85faf BH |
1775 | break; |
1776 | case ACPI_TYPE_THERMAL: | |
778cbc1d BH |
1777 | *type = ACPI_BUS_TYPE_THERMAL; |
1778 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1779 | break; |
1780 | case ACPI_TYPE_POWER: | |
778cbc1d BH |
1781 | *type = ACPI_BUS_TYPE_POWER; |
1782 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1783 | break; |
1784 | default: | |
778cbc1d | 1785 | return -ENODEV; |
51a85faf | 1786 | } |
1da177e4 | 1787 | |
778cbc1d BH |
1788 | return 0; |
1789 | } | |
1790 | ||
cde1f95f | 1791 | bool acpi_device_is_present(const struct acpi_device *adev) |
202317a5 | 1792 | { |
cde1f95f | 1793 | return adev->status.present || adev->status.functional; |
202317a5 RW |
1794 | } |
1795 | ||
4b59cc1f | 1796 | static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, |
844142c3 | 1797 | const char *idstr, |
4b59cc1f RW |
1798 | const struct acpi_device_id **matchid) |
1799 | { | |
1800 | const struct acpi_device_id *devid; | |
1801 | ||
aca0a4eb RW |
1802 | if (handler->match) |
1803 | return handler->match(idstr, matchid); | |
1804 | ||
4b59cc1f RW |
1805 | for (devid = handler->ids; devid->id[0]; devid++) |
1806 | if (!strcmp((char *)devid->id, idstr)) { | |
1807 | if (matchid) | |
1808 | *matchid = devid; | |
1809 | ||
1810 | return true; | |
1811 | } | |
1812 | ||
1813 | return false; | |
1814 | } | |
1815 | ||
844142c3 | 1816 | static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr, |
6b772e8f TK |
1817 | const struct acpi_device_id **matchid) |
1818 | { | |
1819 | struct acpi_scan_handler *handler; | |
1820 | ||
1821 | list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) | |
1822 | if (acpi_scan_handler_matching(handler, idstr, matchid)) | |
1823 | return handler; | |
1824 | ||
1825 | return NULL; | |
1826 | } | |
1827 | ||
3f8055c3 RW |
1828 | void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) |
1829 | { | |
3f8055c3 RW |
1830 | if (!!hotplug->enabled == !!val) |
1831 | return; | |
1832 | ||
1833 | mutex_lock(&acpi_scan_lock); | |
1834 | ||
1835 | hotplug->enabled = val; | |
3f8055c3 RW |
1836 | |
1837 | mutex_unlock(&acpi_scan_lock); | |
1838 | } | |
1839 | ||
3c2cc7ff | 1840 | static void acpi_scan_init_hotplug(struct acpi_device *adev) |
a33ec399 | 1841 | { |
6b772e8f | 1842 | struct acpi_hardware_id *hwid; |
a33ec399 | 1843 | |
b43109fa | 1844 | if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) { |
1e2380cd RW |
1845 | acpi_dock_add(adev); |
1846 | return; | |
1847 | } | |
3c2cc7ff RW |
1848 | list_for_each_entry(hwid, &adev->pnp.ids, list) { |
1849 | struct acpi_scan_handler *handler; | |
a33ec399 | 1850 | |
6b772e8f | 1851 | handler = acpi_scan_match_handler(hwid->id, NULL); |
1a699476 RW |
1852 | if (handler) { |
1853 | adev->flags.hotplug_notify = true; | |
1854 | break; | |
1855 | } | |
3c2cc7ff | 1856 | } |
a33ec399 RW |
1857 | } |
1858 | ||
6fc25088 | 1859 | static u32 acpi_scan_check_dep(acpi_handle handle) |
40e7fcb1 | 1860 | { |
40e7fcb1 LT |
1861 | struct acpi_handle_list dep_devices; |
1862 | acpi_status status; | |
6fc25088 | 1863 | u32 count; |
40e7fcb1 LT |
1864 | int i; |
1865 | ||
71da201f RW |
1866 | /* |
1867 | * Check for _HID here to avoid deferring the enumeration of: | |
1868 | * 1. PCI devices. | |
1869 | * 2. ACPI nodes describing USB ports. | |
1870 | * Still, checking for _HID catches more then just these cases ... | |
1871 | */ | |
1872 | if (!acpi_has_method(handle, "_DEP") || !acpi_has_method(handle, "_HID")) | |
6fc25088 | 1873 | return 0; |
40e7fcb1 | 1874 | |
6fc25088 | 1875 | status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices); |
40e7fcb1 | 1876 | if (ACPI_FAILURE(status)) { |
6fc25088 RW |
1877 | acpi_handle_debug(handle, "Failed to evaluate _DEP.\n"); |
1878 | return 0; | |
40e7fcb1 LT |
1879 | } |
1880 | ||
6fc25088 | 1881 | for (count = 0, i = 0; i < dep_devices.count; i++) { |
40e7fcb1 | 1882 | struct acpi_device_info *info; |
6fc25088 RW |
1883 | struct acpi_dep_data *dep; |
1884 | bool skip; | |
40e7fcb1 LT |
1885 | |
1886 | status = acpi_get_object_info(dep_devices.handles[i], &info); | |
1887 | if (ACPI_FAILURE(status)) { | |
6fc25088 | 1888 | acpi_handle_debug(handle, "Error reading _DEP device info\n"); |
40e7fcb1 LT |
1889 | continue; |
1890 | } | |
1891 | ||
2ef33ee7 | 1892 | skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids); |
40e7fcb1 LT |
1893 | kfree(info); |
1894 | ||
1895 | if (skip) | |
1896 | continue; | |
1897 | ||
6fc25088 | 1898 | dep = kzalloc(sizeof(*dep), GFP_KERNEL); |
40e7fcb1 | 1899 | if (!dep) |
6fc25088 RW |
1900 | continue; |
1901 | ||
1902 | count++; | |
40e7fcb1 | 1903 | |
91438aeb | 1904 | dep->supplier = dep_devices.handles[i]; |
6fc25088 | 1905 | dep->consumer = handle; |
40e7fcb1 LT |
1906 | |
1907 | mutex_lock(&acpi_dep_list_lock); | |
1908 | list_add_tail(&dep->node , &acpi_dep_list); | |
1909 | mutex_unlock(&acpi_dep_list_lock); | |
1910 | } | |
6fc25088 RW |
1911 | |
1912 | return count; | |
40e7fcb1 LT |
1913 | } |
1914 | ||
71da201f RW |
1915 | static void acpi_scan_dep_init(struct acpi_device *adev) |
1916 | { | |
1917 | struct acpi_dep_data *dep; | |
1918 | ||
1919 | mutex_lock(&acpi_dep_list_lock); | |
1920 | ||
1921 | list_for_each_entry(dep, &acpi_dep_list, node) { | |
1922 | if (dep->consumer == adev->handle) | |
1923 | adev->dep_unmet++; | |
1924 | } | |
1925 | ||
1926 | mutex_unlock(&acpi_dep_list_lock); | |
1927 | } | |
1928 | ||
0de7fb7c RW |
1929 | static bool acpi_bus_scan_second_pass; |
1930 | ||
71da201f RW |
1931 | static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep, |
1932 | struct acpi_device **adev_p) | |
778cbc1d | 1933 | { |
805d410f | 1934 | struct acpi_device *device = NULL; |
778cbc1d | 1935 | unsigned long long sta; |
6fc25088 | 1936 | int type; |
778cbc1d BH |
1937 | int result; |
1938 | ||
4002bf38 RW |
1939 | acpi_bus_get_device(handle, &device); |
1940 | if (device) | |
1941 | goto out; | |
1942 | ||
778cbc1d BH |
1943 | result = acpi_bus_type_and_status(handle, &type, &sta); |
1944 | if (result) | |
1945 | return AE_OK; | |
1946 | ||
82c7d5ef RW |
1947 | if (type == ACPI_BUS_TYPE_POWER) { |
1948 | acpi_add_power_resource(handle); | |
1949 | return AE_OK; | |
1950 | } | |
1951 | ||
71da201f RW |
1952 | if (type == ACPI_BUS_TYPE_DEVICE && check_dep) { |
1953 | u32 count = acpi_scan_check_dep(handle); | |
1954 | /* Bail out if the number of recorded dependencies is not 0. */ | |
0de7fb7c RW |
1955 | if (count > 0) { |
1956 | acpi_bus_scan_second_pass = true; | |
71da201f | 1957 | return AE_CTRL_DEPTH; |
0de7fb7c | 1958 | } |
71da201f | 1959 | } |
6fc25088 | 1960 | |
2c0d4fe0 | 1961 | acpi_add_single_object(&device, handle, type, sta); |
e3b87f8a | 1962 | if (!device) |
51a85faf | 1963 | return AE_CTRL_DEPTH; |
1da177e4 | 1964 | |
3c2cc7ff | 1965 | acpi_scan_init_hotplug(device); |
71da201f RW |
1966 | if (!check_dep) |
1967 | acpi_scan_dep_init(device); | |
3c2cc7ff | 1968 | |
71da201f RW |
1969 | out: |
1970 | if (!*adev_p) | |
1971 | *adev_p = device; | |
805d410f | 1972 | |
51a85faf BH |
1973 | return AE_OK; |
1974 | } | |
3fb02738 | 1975 | |
71da201f RW |
1976 | static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used, |
1977 | void *not_used, void **ret_p) | |
1978 | { | |
1979 | return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p); | |
1980 | } | |
1981 | ||
1982 | static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used, | |
1983 | void *not_used, void **ret_p) | |
1984 | { | |
1985 | return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p); | |
1986 | } | |
1987 | ||
48459340 ZR |
1988 | static void acpi_default_enumeration(struct acpi_device *device) |
1989 | { | |
48459340 | 1990 | /* |
d87fb091 JG |
1991 | * Do not enumerate devices with enumeration_by_parent flag set as |
1992 | * they will be enumerated by their respective parents. | |
48459340 | 1993 | */ |
d87fb091 | 1994 | if (!device->flags.enumeration_by_parent) { |
1571875b | 1995 | acpi_create_platform_device(device, NULL); |
10c7e20b | 1996 | acpi_device_set_enumerated(device); |
68bdb677 OP |
1997 | } else { |
1998 | blocking_notifier_call_chain(&acpi_reconfig_chain, | |
1999 | ACPI_RECONFIG_DEVICE_ADD, device); | |
10c7e20b | 2000 | } |
48459340 ZR |
2001 | } |
2002 | ||
7d284352 | 2003 | static const struct acpi_device_id generic_device_ids[] = { |
ee892094 | 2004 | {ACPI_DT_NAMESPACE_HID, }, |
7d284352 RW |
2005 | {"", }, |
2006 | }; | |
2007 | ||
2008 | static int acpi_generic_device_attach(struct acpi_device *adev, | |
2009 | const struct acpi_device_id *not_used) | |
2010 | { | |
2011 | /* | |
ee892094 RW |
2012 | * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test |
2013 | * below can be unconditional. | |
7d284352 RW |
2014 | */ |
2015 | if (adev->data.of_compatible) | |
2016 | acpi_default_enumeration(adev); | |
2017 | ||
2018 | return 1; | |
2019 | } | |
2020 | ||
2021 | static struct acpi_scan_handler generic_device_handler = { | |
2022 | .ids = generic_device_ids, | |
2023 | .attach = acpi_generic_device_attach, | |
2024 | }; | |
2025 | ||
c5698074 | 2026 | static int acpi_scan_attach_handler(struct acpi_device *device) |
ca589f94 | 2027 | { |
c5698074 RW |
2028 | struct acpi_hardware_id *hwid; |
2029 | int ret = 0; | |
ca589f94 | 2030 | |
c5698074 | 2031 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
87b85b3c | 2032 | const struct acpi_device_id *devid; |
c5698074 | 2033 | struct acpi_scan_handler *handler; |
ca589f94 | 2034 | |
c5698074 RW |
2035 | handler = acpi_scan_match_handler(hwid->id, &devid); |
2036 | if (handler) { | |
d34afa9d RW |
2037 | if (!handler->attach) { |
2038 | device->pnp.type.platform_id = 0; | |
2039 | continue; | |
2040 | } | |
9cb32acf | 2041 | device->handler = handler; |
87b85b3c | 2042 | ret = handler->attach(device, devid); |
9cb32acf | 2043 | if (ret > 0) |
c5698074 | 2044 | break; |
9cb32acf RW |
2045 | |
2046 | device->handler = NULL; | |
2047 | if (ret < 0) | |
c5698074 | 2048 | break; |
ca589f94 RW |
2049 | } |
2050 | } | |
48459340 | 2051 | |
ca589f94 RW |
2052 | return ret; |
2053 | } | |
2054 | ||
71da201f | 2055 | static void acpi_bus_attach(struct acpi_device *device, bool first_pass) |
51a85faf | 2056 | { |
2c22e652 | 2057 | struct acpi_device *child; |
71da201f | 2058 | bool skip = !first_pass && device->flags.visited; |
1e2380cd | 2059 | acpi_handle ejd; |
ca589f94 | 2060 | int ret; |
3fb02738 | 2061 | |
71da201f RW |
2062 | if (skip) |
2063 | goto ok; | |
2064 | ||
1e2380cd RW |
2065 | if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd))) |
2066 | register_dock_dependent_device(device, ejd); | |
2067 | ||
2c22e652 | 2068 | acpi_bus_get_status(device); |
202317a5 | 2069 | /* Skip devices that are not present. */ |
2c22e652 | 2070 | if (!acpi_device_is_present(device)) { |
cde1f95f | 2071 | device->flags.initialized = false; |
10c7e20b | 2072 | acpi_device_clear_enumerated(device); |
1b1f3e16 | 2073 | device->flags.power_manageable = 0; |
2c22e652 RW |
2074 | return; |
2075 | } | |
3a391a39 | 2076 | if (device->handler) |
2c22e652 | 2077 | goto ok; |
3a391a39 | 2078 | |
202317a5 | 2079 | if (!device->flags.initialized) { |
1b1f3e16 RW |
2080 | device->flags.power_manageable = |
2081 | device->power.states[ACPI_STATE_D0].flags.valid; | |
2082 | if (acpi_bus_init_power(device)) | |
2083 | device->flags.power_manageable = 0; | |
2084 | ||
202317a5 | 2085 | device->flags.initialized = true; |
c381fc3a RW |
2086 | } else if (device->flags.visited) { |
2087 | goto ok; | |
202317a5 | 2088 | } |
10c7e20b | 2089 | |
ca589f94 | 2090 | ret = acpi_scan_attach_handler(device); |
6931007c | 2091 | if (ret < 0) |
2c22e652 | 2092 | return; |
6931007c RW |
2093 | |
2094 | device->flags.match_driver = true; | |
d87fb091 | 2095 | if (ret > 0 && !device->flags.enumeration_by_parent) { |
f406270b RW |
2096 | acpi_device_set_enumerated(device); |
2097 | goto ok; | |
2c22e652 | 2098 | } |
202317a5 | 2099 | |
f406270b RW |
2100 | ret = device_attach(&device->dev); |
2101 | if (ret < 0) | |
2102 | return; | |
2103 | ||
d87fb091 | 2104 | if (device->pnp.type.platform_id || device->flags.enumeration_by_parent) |
e4330d8b | 2105 | acpi_default_enumeration(device); |
d87fb091 JG |
2106 | else |
2107 | acpi_device_set_enumerated(device); | |
f406270b | 2108 | |
2c22e652 RW |
2109 | ok: |
2110 | list_for_each_entry(child, &device->children, node) | |
71da201f | 2111 | acpi_bus_attach(child, first_pass); |
8ab17fc9 | 2112 | |
71da201f | 2113 | if (!skip && device->handler && device->handler->hotplug.notify_online) |
8ab17fc9 | 2114 | device->handler->hotplug.notify_online(device); |
1da177e4 | 2115 | } |
1da177e4 | 2116 | |
40e7fcb1 LT |
2117 | void acpi_walk_dep_device_list(acpi_handle handle) |
2118 | { | |
2119 | struct acpi_dep_data *dep, *tmp; | |
2120 | struct acpi_device *adev; | |
2121 | ||
2122 | mutex_lock(&acpi_dep_list_lock); | |
2123 | list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) { | |
91438aeb RW |
2124 | if (dep->supplier == handle) { |
2125 | acpi_bus_get_device(dep->consumer, &adev); | |
40e7fcb1 LT |
2126 | if (!adev) |
2127 | continue; | |
2128 | ||
2129 | adev->dep_unmet--; | |
2130 | if (!adev->dep_unmet) | |
71da201f RW |
2131 | acpi_bus_attach(adev, true); |
2132 | ||
40e7fcb1 LT |
2133 | list_del(&dep->node); |
2134 | kfree(dep); | |
2135 | } | |
2136 | } | |
2137 | mutex_unlock(&acpi_dep_list_lock); | |
2138 | } | |
2139 | EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list); | |
2140 | ||
636458de | 2141 | /** |
b8bd759a | 2142 | * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. |
636458de | 2143 | * @handle: Root of the namespace scope to scan. |
7779688f | 2144 | * |
636458de RW |
2145 | * Scan a given ACPI tree (probably recently hot-plugged) and create and add |
2146 | * found devices. | |
7779688f | 2147 | * |
636458de RW |
2148 | * If no devices were found, -ENODEV is returned, but it does not mean that |
2149 | * there has been a real error. There just have been no suitable ACPI objects | |
2150 | * in the table trunk from which the kernel could create a device and add an | |
2151 | * appropriate driver. | |
3757b948 RW |
2152 | * |
2153 | * Must be called under acpi_scan_lock. | |
7779688f | 2154 | */ |
b8bd759a | 2155 | int acpi_bus_scan(acpi_handle handle) |
3fb02738 | 2156 | { |
71da201f RW |
2157 | struct acpi_device *device = NULL; |
2158 | ||
0de7fb7c | 2159 | acpi_bus_scan_second_pass = false; |
3fb02738 | 2160 | |
71da201f | 2161 | /* Pass 1: Avoid enumerating devices with missing dependencies. */ |
3fb02738 | 2162 | |
71da201f | 2163 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device))) |
b8bd759a | 2164 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
71da201f RW |
2165 | acpi_bus_check_add_1, NULL, NULL, |
2166 | (void **)&device); | |
3fb02738 | 2167 | |
71da201f RW |
2168 | if (!device) |
2169 | return -ENODEV; | |
3fb02738 | 2170 | |
71da201f RW |
2171 | acpi_bus_attach(device, true); |
2172 | ||
0de7fb7c | 2173 | if (!acpi_bus_scan_second_pass) |
2c22e652 | 2174 | return 0; |
0de7fb7c | 2175 | |
71da201f RW |
2176 | /* Pass 2: Enumerate all of the remaining devices. */ |
2177 | ||
2178 | device = NULL; | |
2179 | ||
2180 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, false, &device))) | |
2181 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
2182 | acpi_bus_check_add_2, NULL, NULL, | |
2183 | (void **)&device); | |
2184 | ||
2185 | acpi_bus_attach(device, false); | |
2186 | ||
2187 | return 0; | |
3fb02738 | 2188 | } |
2c22e652 | 2189 | EXPORT_SYMBOL(acpi_bus_scan); |
1da177e4 | 2190 | |
3757b948 | 2191 | /** |
2c22e652 RW |
2192 | * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects. |
2193 | * @adev: Root of the ACPI namespace scope to walk. | |
3757b948 RW |
2194 | * |
2195 | * Must be called under acpi_scan_lock. | |
2196 | */ | |
2c22e652 | 2197 | void acpi_bus_trim(struct acpi_device *adev) |
1da177e4 | 2198 | { |
2c22e652 RW |
2199 | struct acpi_scan_handler *handler = adev->handler; |
2200 | struct acpi_device *child; | |
2201 | ||
2202 | list_for_each_entry_reverse(child, &adev->children, node) | |
2203 | acpi_bus_trim(child); | |
2204 | ||
a951c773 | 2205 | adev->flags.match_driver = false; |
2c22e652 RW |
2206 | if (handler) { |
2207 | if (handler->detach) | |
2208 | handler->detach(adev); | |
2209 | ||
2210 | adev->handler = NULL; | |
2211 | } else { | |
2212 | device_release_driver(&adev->dev); | |
2213 | } | |
05404d8f | 2214 | /* |
2c22e652 RW |
2215 | * Most likely, the device is going away, so put it into D3cold before |
2216 | * that. | |
05404d8f | 2217 | */ |
2c22e652 RW |
2218 | acpi_device_set_power(adev, ACPI_STATE_D3_COLD); |
2219 | adev->flags.initialized = false; | |
10c7e20b | 2220 | acpi_device_clear_enumerated(adev); |
1da177e4 | 2221 | } |
ceaba663 KA |
2222 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
2223 | ||
a64a62ce LZ |
2224 | int acpi_bus_register_early_device(int type) |
2225 | { | |
2226 | struct acpi_device *device = NULL; | |
2227 | int result; | |
2228 | ||
2229 | result = acpi_add_single_object(&device, NULL, | |
2230 | type, ACPI_STA_DEFAULT); | |
2231 | if (result) | |
2232 | return result; | |
2233 | ||
2234 | device->flags.match_driver = true; | |
2235 | return device_attach(&device->dev); | |
2236 | } | |
2237 | EXPORT_SYMBOL_GPL(acpi_bus_register_early_device); | |
2238 | ||
e8b945c9 | 2239 | static int acpi_bus_scan_fixed(void) |
1da177e4 | 2240 | { |
4be44fcd | 2241 | int result = 0; |
c4168bff | 2242 | |
1da177e4 LT |
2243 | /* |
2244 | * Enumerate all fixed-feature devices. | |
2245 | */ | |
2c0d4fe0 RW |
2246 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { |
2247 | struct acpi_device *device = NULL; | |
2248 | ||
5c478f49 | 2249 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2250 | ACPI_BUS_TYPE_POWER_BUTTON, |
2c0d4fe0 RW |
2251 | ACPI_STA_DEFAULT); |
2252 | if (result) | |
2253 | return result; | |
2254 | ||
88346167 | 2255 | device->flags.match_driver = true; |
2c0d4fe0 RW |
2256 | result = device_attach(&device->dev); |
2257 | if (result < 0) | |
2258 | return result; | |
2259 | ||
c10d7a13 | 2260 | device_init_wakeup(&device->dev, true); |
3fb02738 | 2261 | } |
1da177e4 | 2262 | |
2c0d4fe0 RW |
2263 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { |
2264 | struct acpi_device *device = NULL; | |
2265 | ||
5c478f49 | 2266 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2267 | ACPI_BUS_TYPE_SLEEP_BUTTON, |
2c0d4fe0 RW |
2268 | ACPI_STA_DEFAULT); |
2269 | if (result) | |
2270 | return result; | |
2271 | ||
88346167 | 2272 | device->flags.match_driver = true; |
2c0d4fe0 | 2273 | result = device_attach(&device->dev); |
3fb02738 | 2274 | } |
1da177e4 | 2275 | |
2c0d4fe0 | 2276 | return result < 0 ? result : 0; |
1da177e4 LT |
2277 | } |
2278 | ||
a4e081b0 SZ |
2279 | static void __init acpi_get_spcr_uart_addr(void) |
2280 | { | |
2281 | acpi_status status; | |
2282 | struct acpi_table_spcr *spcr_ptr; | |
2283 | ||
2284 | status = acpi_get_table(ACPI_SIG_SPCR, 0, | |
2285 | (struct acpi_table_header **)&spcr_ptr); | |
ead7ba13 HG |
2286 | if (ACPI_FAILURE(status)) { |
2287 | pr_warn(PREFIX "STAO table present, but SPCR is missing\n"); | |
2288 | return; | |
2289 | } | |
2290 | ||
2291 | spcr_uart_addr = spcr_ptr->serial_port.address; | |
2292 | acpi_put_table((struct acpi_table_header *)spcr_ptr); | |
a4e081b0 SZ |
2293 | } |
2294 | ||
68bdb677 OP |
2295 | static bool acpi_scan_initialized; |
2296 | ||
e747f274 | 2297 | int __init acpi_scan_init(void) |
1da177e4 LT |
2298 | { |
2299 | int result; | |
a4e081b0 SZ |
2300 | acpi_status status; |
2301 | struct acpi_table_stao *stao_ptr; | |
1da177e4 | 2302 | |
92ef2a25 | 2303 | acpi_pci_root_init(); |
4daeaf68 | 2304 | acpi_pci_link_init(); |
ac212b69 | 2305 | acpi_processor_init(); |
cb0701ac | 2306 | acpi_platform_init(); |
f58b082a | 2307 | acpi_lpss_init(); |
92082a88 | 2308 | acpi_apd_init(); |
2fa97feb | 2309 | acpi_cmos_rtc_init(); |
737f1a9f | 2310 | acpi_container_init(); |
0a347644 | 2311 | acpi_memory_hotplug_init(); |
cc6a0e31 | 2312 | acpi_watchdog_init(); |
eec15edb | 2313 | acpi_pnp_init(); |
3230bbfc | 2314 | acpi_int340x_thermal_init(); |
6ce2e188 | 2315 | acpi_amba_init(); |
eeb2d80d | 2316 | acpi_init_lpit(); |
97d9a9e9 | 2317 | |
7d284352 RW |
2318 | acpi_scan_add_handler(&generic_device_handler); |
2319 | ||
a4e081b0 SZ |
2320 | /* |
2321 | * If there is STAO table, check whether it needs to ignore the UART | |
2322 | * device in SPCR table. | |
2323 | */ | |
2324 | status = acpi_get_table(ACPI_SIG_STAO, 0, | |
2325 | (struct acpi_table_header **)&stao_ptr); | |
2326 | if (ACPI_SUCCESS(status)) { | |
2327 | if (stao_ptr->header.length > sizeof(struct acpi_table_stao)) | |
ead7ba13 | 2328 | pr_info(PREFIX "STAO Name List not yet supported.\n"); |
a4e081b0 SZ |
2329 | |
2330 | if (stao_ptr->ignore_uart) | |
2331 | acpi_get_spcr_uart_addr(); | |
ead7ba13 HG |
2332 | |
2333 | acpi_put_table((struct acpi_table_header *)stao_ptr); | |
a4e081b0 SZ |
2334 | } |
2335 | ||
eb7f43c4 RW |
2336 | acpi_gpe_apply_masked_gpes(); |
2337 | acpi_update_all_gpes(); | |
2338 | ||
7291edca DH |
2339 | /* |
2340 | * Although we call __add_memory() that is documented to require the | |
2341 | * device_hotplug_lock, it is not necessary here because this is an | |
2342 | * early code when userspace or any other code path cannot trigger | |
2343 | * hotplug/hotunplug operations. | |
2344 | */ | |
3757b948 | 2345 | mutex_lock(&acpi_scan_lock); |
1da177e4 LT |
2346 | /* |
2347 | * Enumerate devices in the ACPI namespace. | |
2348 | */ | |
0cd6ac52 RW |
2349 | result = acpi_bus_scan(ACPI_ROOT_OBJECT); |
2350 | if (result) | |
3757b948 | 2351 | goto out; |
1da177e4 | 2352 | |
0cd6ac52 | 2353 | result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); |
1da177e4 | 2354 | if (result) |
3757b948 | 2355 | goto out; |
1da177e4 | 2356 | |
2650ef42 AL |
2357 | /* Fixed feature devices do not exist on HW-reduced platform */ |
2358 | if (!acpi_gbl_reduced_hardware) { | |
2359 | result = acpi_bus_scan_fixed(); | |
2360 | if (result) { | |
2361 | acpi_detach_data(acpi_root->handle, | |
2362 | acpi_scan_drop_device); | |
2363 | acpi_device_del(acpi_root); | |
2364 | put_device(&acpi_root->dev); | |
2365 | goto out; | |
2366 | } | |
b8bd759a | 2367 | } |
1da177e4 | 2368 | |
68bdb677 OP |
2369 | acpi_scan_initialized = true; |
2370 | ||
3757b948 RW |
2371 | out: |
2372 | mutex_unlock(&acpi_scan_lock); | |
2373 | return result; | |
1da177e4 | 2374 | } |
e647b532 MZ |
2375 | |
2376 | static struct acpi_probe_entry *ape; | |
2377 | static int acpi_probe_count; | |
5331d9ca | 2378 | static DEFINE_MUTEX(acpi_probe_mutex); |
e647b532 | 2379 | |
60574d1e | 2380 | static int __init acpi_match_madt(union acpi_subtable_headers *header, |
e647b532 MZ |
2381 | const unsigned long end) |
2382 | { | |
60574d1e | 2383 | if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape)) |
e647b532 MZ |
2384 | if (!ape->probe_subtbl(header, end)) |
2385 | acpi_probe_count++; | |
2386 | ||
2387 | return 0; | |
2388 | } | |
2389 | ||
2390 | int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr) | |
2391 | { | |
2392 | int count = 0; | |
2393 | ||
2394 | if (acpi_disabled) | |
2395 | return 0; | |
2396 | ||
5331d9ca | 2397 | mutex_lock(&acpi_probe_mutex); |
e647b532 | 2398 | for (ape = ap_head; nr; ape++, nr--) { |
5599fb69 | 2399 | if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) { |
e647b532 MZ |
2400 | acpi_probe_count = 0; |
2401 | acpi_table_parse_madt(ape->type, acpi_match_madt, 0); | |
2402 | count += acpi_probe_count; | |
2403 | } else { | |
2404 | int res; | |
2405 | res = acpi_table_parse(ape->id, ape->probe_table); | |
2406 | if (!res) | |
2407 | count++; | |
2408 | } | |
2409 | } | |
5331d9ca | 2410 | mutex_unlock(&acpi_probe_mutex); |
e647b532 MZ |
2411 | |
2412 | return count; | |
2413 | } | |
68bdb677 OP |
2414 | |
2415 | struct acpi_table_events_work { | |
2416 | struct work_struct work; | |
2417 | void *table; | |
2418 | u32 event; | |
2419 | }; | |
2420 | ||
2421 | static void acpi_table_events_fn(struct work_struct *work) | |
2422 | { | |
2423 | struct acpi_table_events_work *tew; | |
2424 | ||
2425 | tew = container_of(work, struct acpi_table_events_work, work); | |
2426 | ||
2427 | if (tew->event == ACPI_TABLE_EVENT_LOAD) { | |
2428 | acpi_scan_lock_acquire(); | |
2429 | acpi_bus_scan(ACPI_ROOT_OBJECT); | |
2430 | acpi_scan_lock_release(); | |
2431 | } | |
2432 | ||
2433 | kfree(tew); | |
2434 | } | |
2435 | ||
2436 | void acpi_scan_table_handler(u32 event, void *table, void *context) | |
2437 | { | |
2438 | struct acpi_table_events_work *tew; | |
2439 | ||
2440 | if (!acpi_scan_initialized) | |
2441 | return; | |
2442 | ||
2443 | if (event != ACPI_TABLE_EVENT_LOAD) | |
2444 | return; | |
2445 | ||
2446 | tew = kmalloc(sizeof(*tew), GFP_KERNEL); | |
2447 | if (!tew) | |
2448 | return; | |
2449 | ||
2450 | INIT_WORK(&tew->work, acpi_table_events_fn); | |
2451 | tew->table = table; | |
2452 | tew->event = event; | |
2453 | ||
2454 | schedule_work(&tew->work); | |
2455 | } | |
2456 | ||
2457 | int acpi_reconfig_notifier_register(struct notifier_block *nb) | |
2458 | { | |
2459 | return blocking_notifier_chain_register(&acpi_reconfig_chain, nb); | |
2460 | } | |
2461 | EXPORT_SYMBOL(acpi_reconfig_notifier_register); | |
2462 | ||
2463 | int acpi_reconfig_notifier_unregister(struct notifier_block *nb) | |
2464 | { | |
2465 | return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb); | |
2466 | } | |
2467 | EXPORT_SYMBOL(acpi_reconfig_notifier_unregister); |