Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * scan.c - support for transforming the ACPI namespace into individual objects | |
3 | */ | |
4 | ||
5 | #include <linux/module.h> | |
6 | #include <linux/init.h> | |
5a0e3ad6 | 7 | #include <linux/slab.h> |
9b6d97b6 | 8 | #include <linux/kernel.h> |
1da177e4 | 9 | #include <linux/acpi.h> |
74523c90 AK |
10 | #include <linux/signal.h> |
11 | #include <linux/kthread.h> | |
222e82ac | 12 | #include <linux/dmi.h> |
d1efe3c3 | 13 | #include <linux/nls.h> |
d0562674 | 14 | #include <linux/dma-mapping.h> |
1da177e4 | 15 | |
d783156e RW |
16 | #include <asm/pgtable.h> |
17 | ||
e60cc7a6 BH |
18 | #include "internal.h" |
19 | ||
1da177e4 | 20 | #define _COMPONENT ACPI_BUS_COMPONENT |
f52fd66d | 21 | ACPI_MODULE_NAME("scan"); |
4be44fcd | 22 | extern struct acpi_device *acpi_root; |
1da177e4 LT |
23 | |
24 | #define ACPI_BUS_CLASS "system_bus" | |
29b71a1c | 25 | #define ACPI_BUS_HID "LNXSYBUS" |
1da177e4 LT |
26 | #define ACPI_BUS_DEVICE_NAME "System Bus" |
27 | ||
859ac9a4 BH |
28 | #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent) |
29 | ||
d783156e RW |
30 | #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page) |
31 | ||
683058e3 RW |
32 | /* |
33 | * If set, devices will be hot-removed even if they cannot be put offline | |
34 | * gracefully (from the kernel's standpoint). | |
35 | */ | |
36 | bool acpi_force_hot_remove; | |
37 | ||
620e112c | 38 | static const char *dummy_hid = "device"; |
2b2ae7c7 | 39 | |
40e7fcb1 LT |
40 | static LIST_HEAD(acpi_dep_list); |
41 | static DEFINE_MUTEX(acpi_dep_list_lock); | |
e49bd2dd | 42 | static LIST_HEAD(acpi_bus_id_list); |
c511cc19 | 43 | static DEFINE_MUTEX(acpi_scan_lock); |
ca589f94 | 44 | static LIST_HEAD(acpi_scan_handlers_list); |
9090589d | 45 | DEFINE_MUTEX(acpi_device_lock); |
1da177e4 | 46 | LIST_HEAD(acpi_wakeup_device_list); |
e525506f | 47 | static DEFINE_MUTEX(acpi_hp_context_lock); |
1da177e4 | 48 | |
40e7fcb1 LT |
49 | struct acpi_dep_data { |
50 | struct list_head node; | |
51 | acpi_handle master; | |
52 | acpi_handle slave; | |
53 | }; | |
54 | ||
e49bd2dd | 55 | struct acpi_device_bus_id{ |
bb095854 | 56 | char bus_id[15]; |
e49bd2dd ZR |
57 | unsigned int instance_no; |
58 | struct list_head node; | |
1da177e4 | 59 | }; |
29b71a1c | 60 | |
3757b948 RW |
61 | void acpi_scan_lock_acquire(void) |
62 | { | |
63 | mutex_lock(&acpi_scan_lock); | |
64 | } | |
65 | EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire); | |
66 | ||
67 | void acpi_scan_lock_release(void) | |
68 | { | |
69 | mutex_unlock(&acpi_scan_lock); | |
70 | } | |
71 | EXPORT_SYMBOL_GPL(acpi_scan_lock_release); | |
72 | ||
e525506f RW |
73 | void acpi_lock_hp_context(void) |
74 | { | |
75 | mutex_lock(&acpi_hp_context_lock); | |
76 | } | |
77 | ||
78 | void acpi_unlock_hp_context(void) | |
79 | { | |
80 | mutex_unlock(&acpi_hp_context_lock); | |
81 | } | |
82 | ||
5d513205 RW |
83 | void acpi_initialize_hp_context(struct acpi_device *adev, |
84 | struct acpi_hotplug_context *hp, | |
85 | int (*notify)(struct acpi_device *, u32), | |
86 | void (*uevent)(struct acpi_device *, u32)) | |
87 | { | |
88 | acpi_lock_hp_context(); | |
ba574dc8 RW |
89 | hp->notify = notify; |
90 | hp->uevent = uevent; | |
91 | acpi_set_hp_context(adev, hp); | |
5d513205 RW |
92 | acpi_unlock_hp_context(); |
93 | } | |
94 | EXPORT_SYMBOL_GPL(acpi_initialize_hp_context); | |
95 | ||
ca589f94 RW |
96 | int acpi_scan_add_handler(struct acpi_scan_handler *handler) |
97 | { | |
d34afa9d | 98 | if (!handler) |
ca589f94 RW |
99 | return -EINVAL; |
100 | ||
101 | list_add_tail(&handler->list_node, &acpi_scan_handlers_list); | |
102 | return 0; | |
103 | } | |
104 | ||
3f8055c3 RW |
105 | int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler, |
106 | const char *hotplug_profile_name) | |
107 | { | |
108 | int error; | |
109 | ||
110 | error = acpi_scan_add_handler(handler); | |
111 | if (error) | |
112 | return error; | |
113 | ||
114 | acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name); | |
115 | return 0; | |
116 | } | |
117 | ||
caa73ea1 | 118 | bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent) |
d22ddcbc RW |
119 | { |
120 | struct acpi_device_physical_node *pn; | |
121 | bool offline = true; | |
122 | ||
4c533c80 RW |
123 | /* |
124 | * acpi_container_offline() calls this for all of the container's | |
125 | * children under the container's physical_node_lock lock. | |
126 | */ | |
127 | mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING); | |
d22ddcbc RW |
128 | |
129 | list_for_each_entry(pn, &adev->physical_node_list, node) | |
130 | if (device_supports_offline(pn->dev) && !pn->dev->offline) { | |
caa73ea1 RW |
131 | if (uevent) |
132 | kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE); | |
133 | ||
d22ddcbc RW |
134 | offline = false; |
135 | break; | |
136 | } | |
137 | ||
138 | mutex_unlock(&adev->physical_node_lock); | |
139 | return offline; | |
140 | } | |
141 | ||
7f28ddec RW |
142 | static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data, |
143 | void **ret_p) | |
683058e3 RW |
144 | { |
145 | struct acpi_device *device = NULL; | |
146 | struct acpi_device_physical_node *pn; | |
303bfdb1 | 147 | bool second_pass = (bool)data; |
683058e3 RW |
148 | acpi_status status = AE_OK; |
149 | ||
150 | if (acpi_bus_get_device(handle, &device)) | |
151 | return AE_OK; | |
152 | ||
7f28ddec RW |
153 | if (device->handler && !device->handler->hotplug.enabled) { |
154 | *ret_p = &device->dev; | |
155 | return AE_SUPPORT; | |
156 | } | |
157 | ||
683058e3 RW |
158 | mutex_lock(&device->physical_node_lock); |
159 | ||
160 | list_for_each_entry(pn, &device->physical_node_list, node) { | |
161 | int ret; | |
162 | ||
303bfdb1 RW |
163 | if (second_pass) { |
164 | /* Skip devices offlined by the first pass. */ | |
165 | if (pn->put_online) | |
166 | continue; | |
167 | } else { | |
168 | pn->put_online = false; | |
169 | } | |
683058e3 RW |
170 | ret = device_offline(pn->dev); |
171 | if (acpi_force_hot_remove) | |
172 | continue; | |
173 | ||
303bfdb1 RW |
174 | if (ret >= 0) { |
175 | pn->put_online = !ret; | |
176 | } else { | |
177 | *ret_p = pn->dev; | |
178 | if (second_pass) { | |
179 | status = AE_ERROR; | |
180 | break; | |
181 | } | |
683058e3 | 182 | } |
683058e3 RW |
183 | } |
184 | ||
185 | mutex_unlock(&device->physical_node_lock); | |
186 | ||
187 | return status; | |
188 | } | |
189 | ||
7f28ddec RW |
190 | static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data, |
191 | void **ret_p) | |
683058e3 RW |
192 | { |
193 | struct acpi_device *device = NULL; | |
194 | struct acpi_device_physical_node *pn; | |
195 | ||
196 | if (acpi_bus_get_device(handle, &device)) | |
197 | return AE_OK; | |
198 | ||
199 | mutex_lock(&device->physical_node_lock); | |
200 | ||
201 | list_for_each_entry(pn, &device->physical_node_list, node) | |
202 | if (pn->put_online) { | |
203 | device_online(pn->dev); | |
204 | pn->put_online = false; | |
205 | } | |
206 | ||
207 | mutex_unlock(&device->physical_node_lock); | |
208 | ||
209 | return AE_OK; | |
210 | } | |
211 | ||
d22ddcbc | 212 | static int acpi_scan_try_to_offline(struct acpi_device *device) |
1da177e4 | 213 | { |
5993c467 | 214 | acpi_handle handle = device->handle; |
d22ddcbc | 215 | struct device *errdev = NULL; |
a33ec399 | 216 | acpi_status status; |
f058cdf4 | 217 | |
303bfdb1 RW |
218 | /* |
219 | * Carry out two passes here and ignore errors in the first pass, | |
220 | * because if the devices in question are memory blocks and | |
221 | * CONFIG_MEMCG is set, one of the blocks may hold data structures | |
222 | * that the other blocks depend on, but it is not known in advance which | |
223 | * block holds them. | |
224 | * | |
225 | * If the first pass is successful, the second one isn't needed, though. | |
226 | */ | |
7f28ddec RW |
227 | status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
228 | NULL, acpi_bus_offline, (void *)false, | |
229 | (void **)&errdev); | |
230 | if (status == AE_SUPPORT) { | |
231 | dev_warn(errdev, "Offline disabled.\n"); | |
232 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
233 | acpi_bus_online, NULL, NULL, NULL); | |
7f28ddec RW |
234 | return -EPERM; |
235 | } | |
236 | acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev); | |
303bfdb1 RW |
237 | if (errdev) { |
238 | errdev = NULL; | |
683058e3 | 239 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
7f28ddec RW |
240 | NULL, acpi_bus_offline, (void *)true, |
241 | (void **)&errdev); | |
303bfdb1 | 242 | if (!errdev || acpi_force_hot_remove) |
7f28ddec RW |
243 | acpi_bus_offline(handle, 0, (void *)true, |
244 | (void **)&errdev); | |
303bfdb1 RW |
245 | |
246 | if (errdev && !acpi_force_hot_remove) { | |
247 | dev_warn(errdev, "Offline failed.\n"); | |
7f28ddec | 248 | acpi_bus_online(handle, 0, NULL, NULL); |
303bfdb1 | 249 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, |
7f28ddec RW |
250 | ACPI_UINT32_MAX, acpi_bus_online, |
251 | NULL, NULL, NULL); | |
303bfdb1 RW |
252 | return -EBUSY; |
253 | } | |
683058e3 | 254 | } |
d22ddcbc RW |
255 | return 0; |
256 | } | |
257 | ||
258 | static int acpi_scan_hot_remove(struct acpi_device *device) | |
259 | { | |
260 | acpi_handle handle = device->handle; | |
261 | unsigned long long sta; | |
262 | acpi_status status; | |
263 | ||
dee15926 TC |
264 | if (device->handler && device->handler->hotplug.demand_offline |
265 | && !acpi_force_hot_remove) { | |
caa73ea1 | 266 | if (!acpi_scan_is_offline(device, true)) |
d22ddcbc RW |
267 | return -EBUSY; |
268 | } else { | |
269 | int error = acpi_scan_try_to_offline(device); | |
270 | if (error) | |
271 | return error; | |
272 | } | |
683058e3 | 273 | |
26d46867 | 274 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
0794469d | 275 | "Hot-removing device %s...\n", dev_name(&device->dev))); |
26d46867 | 276 | |
bfee26db | 277 | acpi_bus_trim(device); |
683058e3 | 278 | |
7d2421f8 | 279 | acpi_evaluate_lck(handle, 0); |
1da177e4 LT |
280 | /* |
281 | * TBD: _EJD support. | |
282 | */ | |
7d2421f8 JL |
283 | status = acpi_evaluate_ej0(handle); |
284 | if (status == AE_NOT_FOUND) | |
285 | return -ENODEV; | |
286 | else if (ACPI_FAILURE(status)) | |
287 | return -EIO; | |
1da177e4 | 288 | |
882fd12e TK |
289 | /* |
290 | * Verify if eject was indeed successful. If not, log an error | |
291 | * message. No need to call _OST since _EJ0 call was made OK. | |
292 | */ | |
293 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
294 | if (ACPI_FAILURE(status)) { | |
295 | acpi_handle_warn(handle, | |
296 | "Status check after eject failed (0x%x)\n", status); | |
297 | } else if (sta & ACPI_STA_DEVICE_ENABLED) { | |
298 | acpi_handle_warn(handle, | |
299 | "Eject incomplete - status 0x%llx\n", sta); | |
300 | } | |
301 | ||
a33ec399 RW |
302 | return 0; |
303 | } | |
1da177e4 | 304 | |
443fc820 RW |
305 | static int acpi_scan_device_not_present(struct acpi_device *adev) |
306 | { | |
307 | if (!acpi_device_enumerated(adev)) { | |
308 | dev_warn(&adev->dev, "Still not present\n"); | |
309 | return -EALREADY; | |
310 | } | |
311 | acpi_bus_trim(adev); | |
312 | return 0; | |
313 | } | |
314 | ||
c27b2c33 | 315 | static int acpi_scan_device_check(struct acpi_device *adev) |
a33ec399 | 316 | { |
f943db40 | 317 | int error; |
a33ec399 | 318 | |
443fc820 RW |
319 | acpi_bus_get_status(adev); |
320 | if (adev->status.present || adev->status.functional) { | |
321 | /* | |
322 | * This function is only called for device objects for which | |
323 | * matching scan handlers exist. The only situation in which | |
324 | * the scan handler is not attached to this device object yet | |
325 | * is when the device has just appeared (either it wasn't | |
326 | * present at all before or it was removed and then added | |
327 | * again). | |
328 | */ | |
329 | if (adev->handler) { | |
330 | dev_warn(&adev->dev, "Already enumerated\n"); | |
331 | return -EALREADY; | |
332 | } | |
333 | error = acpi_bus_scan(adev->handle); | |
334 | if (error) { | |
335 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
336 | return error; | |
337 | } | |
338 | if (!adev->handler) { | |
339 | dev_warn(&adev->dev, "Enumeration failure\n"); | |
340 | error = -ENODEV; | |
341 | } | |
342 | } else { | |
343 | error = acpi_scan_device_not_present(adev); | |
344 | } | |
345 | return error; | |
346 | } | |
347 | ||
348 | static int acpi_scan_bus_check(struct acpi_device *adev) | |
349 | { | |
350 | struct acpi_scan_handler *handler = adev->handler; | |
351 | struct acpi_device *child; | |
352 | int error; | |
353 | ||
354 | acpi_bus_get_status(adev); | |
355 | if (!(adev->status.present || adev->status.functional)) { | |
356 | acpi_scan_device_not_present(adev); | |
357 | return 0; | |
358 | } | |
359 | if (handler && handler->hotplug.scan_dependent) | |
360 | return handler->hotplug.scan_dependent(adev); | |
361 | ||
c27b2c33 RW |
362 | error = acpi_bus_scan(adev->handle); |
363 | if (error) { | |
364 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
365 | return error; | |
366 | } | |
443fc820 RW |
367 | list_for_each_entry(child, &adev->children, node) { |
368 | error = acpi_scan_bus_check(child); | |
369 | if (error) | |
370 | return error; | |
c27b2c33 RW |
371 | } |
372 | return 0; | |
a33ec399 RW |
373 | } |
374 | ||
3c2cc7ff RW |
375 | static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type) |
376 | { | |
377 | switch (type) { | |
378 | case ACPI_NOTIFY_BUS_CHECK: | |
379 | return acpi_scan_bus_check(adev); | |
380 | case ACPI_NOTIFY_DEVICE_CHECK: | |
381 | return acpi_scan_device_check(adev); | |
382 | case ACPI_NOTIFY_EJECT_REQUEST: | |
383 | case ACPI_OST_EC_OSPM_EJECT: | |
dd2151be RW |
384 | if (adev->handler && !adev->handler->hotplug.enabled) { |
385 | dev_info(&adev->dev, "Eject disabled\n"); | |
386 | return -EPERM; | |
387 | } | |
700b8422 RW |
388 | acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST, |
389 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); | |
3c2cc7ff RW |
390 | return acpi_scan_hot_remove(adev); |
391 | } | |
392 | return -EINVAL; | |
393 | } | |
394 | ||
1e3bcb59 | 395 | void acpi_device_hotplug(struct acpi_device *adev, u32 src) |
a33ec399 | 396 | { |
a33ec399 | 397 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
3c2cc7ff | 398 | int error = -ENODEV; |
a33ec399 | 399 | |
683058e3 | 400 | lock_device_hotplug(); |
e0ae8fee | 401 | mutex_lock(&acpi_scan_lock); |
a33ec399 | 402 | |
c27b2c33 RW |
403 | /* |
404 | * The device object's ACPI handle cannot become invalid as long as we | |
3c2cc7ff | 405 | * are holding acpi_scan_lock, but it might have become invalid before |
c27b2c33 RW |
406 | * that lock was acquired. |
407 | */ | |
408 | if (adev->handle == INVALID_ACPI_HANDLE) | |
3c2cc7ff | 409 | goto err_out; |
c27b2c33 | 410 | |
1e2380cd RW |
411 | if (adev->flags.is_dock_station) { |
412 | error = dock_notify(adev, src); | |
413 | } else if (adev->flags.hotplug_notify) { | |
3c2cc7ff | 414 | error = acpi_generic_hotplug_event(adev, src); |
dd2151be RW |
415 | if (error == -EPERM) { |
416 | ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; | |
417 | goto err_out; | |
418 | } | |
3c2cc7ff | 419 | } else { |
be27b3dc | 420 | int (*notify)(struct acpi_device *, u32); |
3c2cc7ff RW |
421 | |
422 | acpi_lock_hp_context(); | |
be27b3dc | 423 | notify = adev->hp ? adev->hp->notify : NULL; |
3c2cc7ff RW |
424 | acpi_unlock_hp_context(); |
425 | /* | |
426 | * There may be additional notify handlers for device objects | |
427 | * without the .event() callback, so ignore them here. | |
428 | */ | |
be27b3dc RW |
429 | if (notify) |
430 | error = notify(adev, src); | |
3c2cc7ff RW |
431 | else |
432 | goto out; | |
a33ec399 | 433 | } |
c27b2c33 RW |
434 | if (!error) |
435 | ost_code = ACPI_OST_SC_SUCCESS; | |
a33ec399 | 436 | |
3c2cc7ff | 437 | err_out: |
700b8422 | 438 | acpi_evaluate_ost(adev->handle, src, ost_code, NULL); |
3c2cc7ff RW |
439 | |
440 | out: | |
78ea4639 | 441 | acpi_bus_put_acpi_device(adev); |
a33ec399 | 442 | mutex_unlock(&acpi_scan_lock); |
e0ae8fee | 443 | unlock_device_hotplug(); |
a33ec399 RW |
444 | } |
445 | ||
0b224527 RW |
446 | static void acpi_free_power_resources_lists(struct acpi_device *device) |
447 | { | |
448 | int i; | |
449 | ||
993cbe59 RW |
450 | if (device->wakeup.flags.valid) |
451 | acpi_power_resources_list_free(&device->wakeup.resources); | |
452 | ||
1b1f3e16 | 453 | if (!device->power.flags.power_resources) |
0b224527 RW |
454 | return; |
455 | ||
456 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { | |
457 | struct acpi_device_power_state *ps = &device->power.states[i]; | |
458 | acpi_power_resources_list_free(&ps->resources); | |
459 | } | |
7f47fa6c BH |
460 | } |
461 | ||
1890a97a | 462 | static void acpi_device_release(struct device *dev) |
1da177e4 | 463 | { |
1890a97a | 464 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1da177e4 | 465 | |
ffdcd955 | 466 | acpi_free_properties(acpi_dev); |
c0af4175 | 467 | acpi_free_pnp_ids(&acpi_dev->pnp); |
0b224527 | 468 | acpi_free_power_resources_lists(acpi_dev); |
1890a97a | 469 | kfree(acpi_dev); |
1da177e4 LT |
470 | } |
471 | ||
d783156e RW |
472 | static void acpi_device_del(struct acpi_device *device) |
473 | { | |
474 | mutex_lock(&acpi_device_lock); | |
475 | if (device->parent) | |
476 | list_del(&device->node); | |
477 | ||
478 | list_del(&device->wakeup_list); | |
479 | mutex_unlock(&acpi_device_lock); | |
480 | ||
481 | acpi_power_add_remove_device(device, false); | |
482 | acpi_device_remove_files(device); | |
483 | if (device->remove) | |
484 | device->remove(device); | |
485 | ||
486 | device_del(&device->dev); | |
487 | } | |
488 | ||
489 | static LIST_HEAD(acpi_device_del_list); | |
490 | static DEFINE_MUTEX(acpi_device_del_lock); | |
491 | ||
492 | static void acpi_device_del_work_fn(struct work_struct *work_not_used) | |
493 | { | |
494 | for (;;) { | |
495 | struct acpi_device *adev; | |
496 | ||
497 | mutex_lock(&acpi_device_del_lock); | |
498 | ||
499 | if (list_empty(&acpi_device_del_list)) { | |
500 | mutex_unlock(&acpi_device_del_lock); | |
501 | break; | |
502 | } | |
503 | adev = list_first_entry(&acpi_device_del_list, | |
504 | struct acpi_device, del_list); | |
505 | list_del(&adev->del_list); | |
506 | ||
507 | mutex_unlock(&acpi_device_del_lock); | |
508 | ||
509 | acpi_device_del(adev); | |
510 | /* | |
511 | * Drop references to all power resources that might have been | |
512 | * used by the device. | |
513 | */ | |
514 | acpi_power_transition(adev, ACPI_STATE_D3_COLD); | |
515 | put_device(&adev->dev); | |
516 | } | |
517 | } | |
518 | ||
519 | /** | |
520 | * acpi_scan_drop_device - Drop an ACPI device object. | |
521 | * @handle: Handle of an ACPI namespace node, not used. | |
522 | * @context: Address of the ACPI device object to drop. | |
523 | * | |
524 | * This is invoked by acpi_ns_delete_node() during the removal of the ACPI | |
525 | * namespace node the device object pointed to by @context is attached to. | |
526 | * | |
527 | * The unregistration is carried out asynchronously to avoid running | |
528 | * acpi_device_del() under the ACPICA's namespace mutex and the list is used to | |
529 | * ensure the correct ordering (the device objects must be unregistered in the | |
530 | * same order in which the corresponding namespace nodes are deleted). | |
531 | */ | |
532 | static void acpi_scan_drop_device(acpi_handle handle, void *context) | |
caf5c03f | 533 | { |
d783156e RW |
534 | static DECLARE_WORK(work, acpi_device_del_work_fn); |
535 | struct acpi_device *adev = context; | |
536 | ||
537 | mutex_lock(&acpi_device_del_lock); | |
538 | ||
539 | /* | |
540 | * Use the ACPI hotplug workqueue which is ordered, so this work item | |
541 | * won't run after any hotplug work items submitted subsequently. That | |
542 | * prevents attempts to register device objects identical to those being | |
543 | * deleted from happening concurrently (such attempts result from | |
544 | * hotplug events handled via the ACPI hotplug workqueue). It also will | |
545 | * run after all of the work items submitted previosuly, which helps | |
546 | * those work items to ensure that they are not accessing stale device | |
547 | * objects. | |
548 | */ | |
549 | if (list_empty(&acpi_device_del_list)) | |
550 | acpi_queue_hotplug_work(&work); | |
551 | ||
552 | list_add_tail(&adev->del_list, &acpi_device_del_list); | |
553 | /* Make acpi_ns_validate_handle() return NULL for this handle. */ | |
554 | adev->handle = INVALID_ACPI_HANDLE; | |
555 | ||
556 | mutex_unlock(&acpi_device_del_lock); | |
caf5c03f RW |
557 | } |
558 | ||
78ea4639 RW |
559 | static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device, |
560 | void (*callback)(void *)) | |
caf5c03f RW |
561 | { |
562 | acpi_status status; | |
563 | ||
564 | if (!device) | |
565 | return -EINVAL; | |
566 | ||
78ea4639 RW |
567 | status = acpi_get_data_full(handle, acpi_scan_drop_device, |
568 | (void **)device, callback); | |
caf5c03f RW |
569 | if (ACPI_FAILURE(status) || !*device) { |
570 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", | |
571 | handle)); | |
572 | return -ENODEV; | |
573 | } | |
574 | return 0; | |
575 | } | |
78ea4639 RW |
576 | |
577 | int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) | |
578 | { | |
579 | return acpi_get_device_data(handle, device, NULL); | |
580 | } | |
6585925b | 581 | EXPORT_SYMBOL(acpi_bus_get_device); |
caf5c03f | 582 | |
78ea4639 RW |
583 | static void get_acpi_device(void *dev) |
584 | { | |
585 | if (dev) | |
586 | get_device(&((struct acpi_device *)dev)->dev); | |
587 | } | |
588 | ||
589 | struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle) | |
590 | { | |
591 | struct acpi_device *adev = NULL; | |
592 | ||
593 | acpi_get_device_data(handle, &adev, get_acpi_device); | |
594 | return adev; | |
595 | } | |
596 | ||
597 | void acpi_bus_put_acpi_device(struct acpi_device *adev) | |
598 | { | |
599 | put_device(&adev->dev); | |
600 | } | |
601 | ||
cf860be6 RW |
602 | int acpi_device_add(struct acpi_device *device, |
603 | void (*release)(struct device *)) | |
1da177e4 | 604 | { |
4be44fcd | 605 | int result; |
e49bd2dd ZR |
606 | struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; |
607 | int found = 0; | |
66b7ed40 | 608 | |
d43e167d RW |
609 | if (device->handle) { |
610 | acpi_status status; | |
611 | ||
d783156e | 612 | status = acpi_attach_data(device->handle, acpi_scan_drop_device, |
d43e167d RW |
613 | device); |
614 | if (ACPI_FAILURE(status)) { | |
615 | acpi_handle_err(device->handle, | |
616 | "Unable to attach device data\n"); | |
617 | return -ENODEV; | |
618 | } | |
619 | } | |
620 | ||
9e89dde2 ZR |
621 | /* |
622 | * Linkage | |
623 | * ------- | |
624 | * Link this device to its parent and siblings. | |
625 | */ | |
626 | INIT_LIST_HEAD(&device->children); | |
627 | INIT_LIST_HEAD(&device->node); | |
9e89dde2 | 628 | INIT_LIST_HEAD(&device->wakeup_list); |
1033f904 | 629 | INIT_LIST_HEAD(&device->physical_node_list); |
d783156e | 630 | INIT_LIST_HEAD(&device->del_list); |
1033f904 | 631 | mutex_init(&device->physical_node_lock); |
1da177e4 | 632 | |
e49bd2dd ZR |
633 | new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); |
634 | if (!new_bus_id) { | |
d43e167d RW |
635 | pr_err(PREFIX "Memory allocation error\n"); |
636 | result = -ENOMEM; | |
637 | goto err_detach; | |
1da177e4 | 638 | } |
e49bd2dd | 639 | |
9090589d | 640 | mutex_lock(&acpi_device_lock); |
e49bd2dd ZR |
641 | /* |
642 | * Find suitable bus_id and instance number in acpi_bus_id_list | |
643 | * If failed, create one and link it into acpi_bus_id_list | |
644 | */ | |
645 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { | |
1131b938 BH |
646 | if (!strcmp(acpi_device_bus_id->bus_id, |
647 | acpi_device_hid(device))) { | |
648 | acpi_device_bus_id->instance_no++; | |
e49bd2dd ZR |
649 | found = 1; |
650 | kfree(new_bus_id); | |
651 | break; | |
652 | } | |
1da177e4 | 653 | } |
0c526d96 | 654 | if (!found) { |
e49bd2dd | 655 | acpi_device_bus_id = new_bus_id; |
1131b938 | 656 | strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); |
e49bd2dd ZR |
657 | acpi_device_bus_id->instance_no = 0; |
658 | list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); | |
1da177e4 | 659 | } |
0794469d | 660 | dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); |
1da177e4 | 661 | |
33b57150 | 662 | if (device->parent) |
9e89dde2 | 663 | list_add_tail(&device->node, &device->parent->children); |
33b57150 | 664 | |
9e89dde2 ZR |
665 | if (device->wakeup.flags.valid) |
666 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); | |
9090589d | 667 | mutex_unlock(&acpi_device_lock); |
1da177e4 | 668 | |
1890a97a | 669 | if (device->parent) |
66b7ed40 | 670 | device->dev.parent = &device->parent->dev; |
1890a97a | 671 | device->dev.bus = &acpi_bus_type; |
82c7d5ef | 672 | device->dev.release = release; |
cf860be6 | 673 | result = device_add(&device->dev); |
0c526d96 | 674 | if (result) { |
8b12b922 | 675 | dev_err(&device->dev, "Error registering device\n"); |
d43e167d | 676 | goto err; |
1da177e4 | 677 | } |
1da177e4 | 678 | |
e49bd2dd | 679 | result = acpi_device_setup_files(device); |
0c526d96 | 680 | if (result) |
0794469d KS |
681 | printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", |
682 | dev_name(&device->dev)); | |
1da177e4 | 683 | |
1da177e4 | 684 | return 0; |
d43e167d RW |
685 | |
686 | err: | |
9090589d | 687 | mutex_lock(&acpi_device_lock); |
33b57150 | 688 | if (device->parent) |
e49bd2dd | 689 | list_del(&device->node); |
e49bd2dd | 690 | list_del(&device->wakeup_list); |
9090589d | 691 | mutex_unlock(&acpi_device_lock); |
d43e167d RW |
692 | |
693 | err_detach: | |
d783156e | 694 | acpi_detach_data(device->handle, acpi_scan_drop_device); |
e49bd2dd | 695 | return result; |
1da177e4 LT |
696 | } |
697 | ||
8a0662d9 RW |
698 | struct acpi_device *acpi_get_next_child(struct device *dev, |
699 | struct acpi_device *child) | |
700 | { | |
701 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
702 | struct list_head *head, *next; | |
703 | ||
704 | if (!adev) | |
705 | return NULL; | |
706 | ||
707 | head = &adev->children; | |
708 | if (list_empty(head)) | |
709 | return NULL; | |
710 | ||
711 | if (!child) | |
712 | return list_first_entry(head, struct acpi_device, node); | |
713 | ||
714 | next = child->node.next; | |
715 | return next == head ? NULL : list_entry(next, struct acpi_device, node); | |
716 | } | |
717 | ||
9e89dde2 ZR |
718 | /* -------------------------------------------------------------------------- |
719 | Device Enumeration | |
720 | -------------------------------------------------------------------------- */ | |
5c478f49 BH |
721 | static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) |
722 | { | |
456de893 | 723 | struct acpi_device *device = NULL; |
5c478f49 | 724 | acpi_status status; |
5c478f49 BH |
725 | |
726 | /* | |
727 | * Fixed hardware devices do not appear in the namespace and do not | |
728 | * have handles, but we fabricate acpi_devices for them, so we have | |
729 | * to deal with them specially. | |
730 | */ | |
456de893 | 731 | if (!handle) |
5c478f49 BH |
732 | return acpi_root; |
733 | ||
734 | do { | |
735 | status = acpi_get_parent(handle, &handle); | |
5c478f49 | 736 | if (ACPI_FAILURE(status)) |
456de893 RW |
737 | return status == AE_NULL_ENTRY ? NULL : acpi_root; |
738 | } while (acpi_bus_get_device(handle, &device)); | |
739 | return device; | |
5c478f49 BH |
740 | } |
741 | ||
9e89dde2 ZR |
742 | acpi_status |
743 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) | |
744 | { | |
745 | acpi_status status; | |
746 | acpi_handle tmp; | |
747 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
748 | union acpi_object *obj; | |
749 | ||
750 | status = acpi_get_handle(handle, "_EJD", &tmp); | |
751 | if (ACPI_FAILURE(status)) | |
752 | return status; | |
753 | ||
754 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); | |
755 | if (ACPI_SUCCESS(status)) { | |
756 | obj = buffer.pointer; | |
3b5fee59 HM |
757 | status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, |
758 | ejd); | |
9e89dde2 ZR |
759 | kfree(buffer.pointer); |
760 | } | |
761 | return status; | |
762 | } | |
763 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); | |
764 | ||
e88c9c60 RW |
765 | static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle, |
766 | struct acpi_device_wakeup *wakeup) | |
9e89dde2 | 767 | { |
b581a7f9 RW |
768 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
769 | union acpi_object *package = NULL; | |
9e89dde2 | 770 | union acpi_object *element = NULL; |
b581a7f9 | 771 | acpi_status status; |
e88c9c60 | 772 | int err = -ENODATA; |
9e89dde2 | 773 | |
b581a7f9 | 774 | if (!wakeup) |
e88c9c60 | 775 | return -EINVAL; |
9e89dde2 | 776 | |
993cbe59 | 777 | INIT_LIST_HEAD(&wakeup->resources); |
9e89dde2 | 778 | |
b581a7f9 RW |
779 | /* _PRW */ |
780 | status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); | |
781 | if (ACPI_FAILURE(status)) { | |
782 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); | |
e88c9c60 | 783 | return err; |
b581a7f9 RW |
784 | } |
785 | ||
786 | package = (union acpi_object *)buffer.pointer; | |
787 | ||
e88c9c60 | 788 | if (!package || package->package.count < 2) |
b581a7f9 | 789 | goto out; |
b581a7f9 | 790 | |
9e89dde2 | 791 | element = &(package->package.elements[0]); |
e88c9c60 | 792 | if (!element) |
b581a7f9 | 793 | goto out; |
e88c9c60 | 794 | |
9e89dde2 ZR |
795 | if (element->type == ACPI_TYPE_PACKAGE) { |
796 | if ((element->package.count < 2) || | |
797 | (element->package.elements[0].type != | |
798 | ACPI_TYPE_LOCAL_REFERENCE) | |
e88c9c60 | 799 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
b581a7f9 | 800 | goto out; |
e88c9c60 | 801 | |
b581a7f9 | 802 | wakeup->gpe_device = |
9e89dde2 | 803 | element->package.elements[0].reference.handle; |
b581a7f9 | 804 | wakeup->gpe_number = |
9e89dde2 ZR |
805 | (u32) element->package.elements[1].integer.value; |
806 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
b581a7f9 RW |
807 | wakeup->gpe_device = NULL; |
808 | wakeup->gpe_number = element->integer.value; | |
809 | } else { | |
b581a7f9 RW |
810 | goto out; |
811 | } | |
9e89dde2 ZR |
812 | |
813 | element = &(package->package.elements[1]); | |
e88c9c60 | 814 | if (element->type != ACPI_TYPE_INTEGER) |
b581a7f9 | 815 | goto out; |
e88c9c60 | 816 | |
b581a7f9 | 817 | wakeup->sleep_state = element->integer.value; |
9e89dde2 | 818 | |
e88c9c60 RW |
819 | err = acpi_extract_power_resources(package, 2, &wakeup->resources); |
820 | if (err) | |
b581a7f9 | 821 | goto out; |
9e89dde2 | 822 | |
0596a52b RW |
823 | if (!list_empty(&wakeup->resources)) { |
824 | int sleep_state; | |
9e89dde2 | 825 | |
b5d667eb RW |
826 | err = acpi_power_wakeup_list_init(&wakeup->resources, |
827 | &sleep_state); | |
828 | if (err) { | |
829 | acpi_handle_warn(handle, "Retrieving current states " | |
830 | "of wakeup power resources failed\n"); | |
831 | acpi_power_resources_list_free(&wakeup->resources); | |
832 | goto out; | |
833 | } | |
0596a52b RW |
834 | if (sleep_state < wakeup->sleep_state) { |
835 | acpi_handle_warn(handle, "Overriding _PRW sleep state " | |
836 | "(S%d) by S%d from power resources\n", | |
837 | (int)wakeup->sleep_state, sleep_state); | |
838 | wakeup->sleep_state = sleep_state; | |
839 | } | |
840 | } | |
9874647b | 841 | |
b581a7f9 RW |
842 | out: |
843 | kfree(buffer.pointer); | |
e88c9c60 | 844 | return err; |
1da177e4 LT |
845 | } |
846 | ||
bd9b2f9a | 847 | static void acpi_wakeup_gpe_init(struct acpi_device *device) |
1da177e4 | 848 | { |
0519ade7 | 849 | static const struct acpi_device_id button_device_ids[] = { |
29b71a1c | 850 | {"PNP0C0C", 0}, |
b7e38304 | 851 | {"PNP0C0D", 0}, |
29b71a1c TR |
852 | {"PNP0C0E", 0}, |
853 | {"", 0}, | |
854 | }; | |
bd9b2f9a | 855 | struct acpi_device_wakeup *wakeup = &device->wakeup; |
f517709d RW |
856 | acpi_status status; |
857 | acpi_event_status event_status; | |
858 | ||
bd9b2f9a | 859 | wakeup->flags.notifier_present = 0; |
f517709d RW |
860 | |
861 | /* Power button, Lid switch always enable wakeup */ | |
862 | if (!acpi_match_device_ids(device, button_device_ids)) { | |
bd9b2f9a | 863 | wakeup->flags.run_wake = 1; |
b7e38304 ZR |
864 | if (!acpi_match_device_ids(device, &button_device_ids[1])) { |
865 | /* Do not use Lid/sleep button for S5 wakeup */ | |
bd9b2f9a RW |
866 | if (wakeup->sleep_state == ACPI_STATE_S5) |
867 | wakeup->sleep_state = ACPI_STATE_S4; | |
b7e38304 | 868 | } |
bd9b2f9a | 869 | acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number); |
f2b56bc8 | 870 | device_set_wakeup_capable(&device->dev, true); |
f517709d RW |
871 | return; |
872 | } | |
873 | ||
bd9b2f9a RW |
874 | acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device, |
875 | wakeup->gpe_number); | |
876 | status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number, | |
877 | &event_status); | |
878 | if (ACPI_FAILURE(status)) | |
879 | return; | |
880 | ||
2f857234 | 881 | wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER); |
f517709d RW |
882 | } |
883 | ||
d57d09a4 | 884 | static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
f517709d | 885 | { |
e88c9c60 | 886 | int err; |
29b71a1c | 887 | |
d57d09a4 | 888 | /* Presence of _PRW indicates wake capable */ |
952c63e9 | 889 | if (!acpi_has_method(device->handle, "_PRW")) |
d57d09a4 RW |
890 | return; |
891 | ||
e88c9c60 RW |
892 | err = acpi_bus_extract_wakeup_device_power_package(device->handle, |
893 | &device->wakeup); | |
894 | if (err) { | |
895 | dev_err(&device->dev, "_PRW evaluation error: %d\n", err); | |
d57d09a4 | 896 | return; |
9e89dde2 | 897 | } |
1da177e4 | 898 | |
9e89dde2 | 899 | device->wakeup.flags.valid = 1; |
9b83ccd2 | 900 | device->wakeup.prepare_count = 0; |
bd9b2f9a | 901 | acpi_wakeup_gpe_init(device); |
729b2bdb ZY |
902 | /* Call _PSW/_DSW object to disable its ability to wake the sleeping |
903 | * system for the ACPI device with the _PRW object. | |
904 | * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. | |
905 | * So it is necessary to call _DSW object first. Only when it is not | |
906 | * present will the _PSW object used. | |
907 | */ | |
e88c9c60 RW |
908 | err = acpi_device_sleep_wake(device, 0, 0, 0); |
909 | if (err) | |
77e76609 RW |
910 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
911 | "error in _DSW or _PSW evaluation\n")); | |
1da177e4 | 912 | } |
1da177e4 | 913 | |
f33ce568 RW |
914 | static void acpi_bus_init_power_state(struct acpi_device *device, int state) |
915 | { | |
916 | struct acpi_device_power_state *ps = &device->power.states[state]; | |
ef85bdbe RW |
917 | char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; |
918 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
f33ce568 | 919 | acpi_status status; |
bf325f95 | 920 | |
f33ce568 RW |
921 | INIT_LIST_HEAD(&ps->resources); |
922 | ||
ef85bdbe RW |
923 | /* Evaluate "_PRx" to get referenced power resources */ |
924 | status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); | |
925 | if (ACPI_SUCCESS(status)) { | |
926 | union acpi_object *package = buffer.pointer; | |
927 | ||
928 | if (buffer.length && package | |
929 | && package->type == ACPI_TYPE_PACKAGE | |
930 | && package->package.count) { | |
e88c9c60 RW |
931 | int err = acpi_extract_power_resources(package, 0, |
932 | &ps->resources); | |
933 | if (!err) | |
ef85bdbe | 934 | device->power.flags.power_resources = 1; |
f33ce568 | 935 | } |
ef85bdbe | 936 | ACPI_FREE(buffer.pointer); |
f33ce568 RW |
937 | } |
938 | ||
939 | /* Evaluate "_PSx" to see if we can do explicit sets */ | |
ef85bdbe | 940 | pathname[2] = 'S'; |
952c63e9 | 941 | if (acpi_has_method(device->handle, pathname)) |
f33ce568 RW |
942 | ps->flags.explicit_set = 1; |
943 | ||
20dacb71 RW |
944 | /* State is valid if there are means to put the device into it. */ |
945 | if (!list_empty(&ps->resources) || ps->flags.explicit_set) | |
f33ce568 | 946 | ps->flags.valid = 1; |
f33ce568 RW |
947 | |
948 | ps->power = -1; /* Unknown - driver assigned */ | |
949 | ps->latency = -1; /* Unknown - driver assigned */ | |
950 | } | |
951 | ||
d43e167d | 952 | static void acpi_bus_get_power_flags(struct acpi_device *device) |
1da177e4 | 953 | { |
8bc5053b | 954 | u32 i; |
1a365616 | 955 | |
d43e167d | 956 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ |
952c63e9 JL |
957 | if (!acpi_has_method(device->handle, "_PS0") && |
958 | !acpi_has_method(device->handle, "_PR0")) | |
959 | return; | |
1a365616 | 960 | |
d43e167d | 961 | device->flags.power_manageable = 1; |
4be44fcd | 962 | |
9e89dde2 ZR |
963 | /* |
964 | * Power Management Flags | |
965 | */ | |
952c63e9 | 966 | if (acpi_has_method(device->handle, "_PSC")) |
9e89dde2 | 967 | device->power.flags.explicit_get = 1; |
f25c0ae2 | 968 | |
952c63e9 | 969 | if (acpi_has_method(device->handle, "_IRC")) |
9e89dde2 | 970 | device->power.flags.inrush_current = 1; |
1da177e4 | 971 | |
f25c0ae2 RW |
972 | if (acpi_has_method(device->handle, "_DSW")) |
973 | device->power.flags.dsw_present = 1; | |
974 | ||
9e89dde2 ZR |
975 | /* |
976 | * Enumerate supported power management states | |
977 | */ | |
f33ce568 RW |
978 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) |
979 | acpi_bus_init_power_state(device, i); | |
bf325f95 | 980 | |
0b224527 | 981 | INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); |
20dacb71 RW |
982 | if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources)) |
983 | device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; | |
1da177e4 | 984 | |
20dacb71 | 985 | /* Set defaults for D0 and D3hot states (always valid) */ |
9e89dde2 ZR |
986 | device->power.states[ACPI_STATE_D0].flags.valid = 1; |
987 | device->power.states[ACPI_STATE_D0].power = 100; | |
20dacb71 | 988 | device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1; |
1399dfcd | 989 | |
1b1f3e16 | 990 | if (acpi_bus_init_power(device)) |
b3785492 | 991 | device->flags.power_manageable = 0; |
9e89dde2 | 992 | } |
c8f7a62c | 993 | |
d43e167d | 994 | static void acpi_bus_get_flags(struct acpi_device *device) |
1da177e4 | 995 | { |
1da177e4 | 996 | /* Presence of _STA indicates 'dynamic_status' */ |
952c63e9 | 997 | if (acpi_has_method(device->handle, "_STA")) |
1da177e4 LT |
998 | device->flags.dynamic_status = 1; |
999 | ||
1da177e4 | 1000 | /* Presence of _RMV indicates 'removable' */ |
952c63e9 | 1001 | if (acpi_has_method(device->handle, "_RMV")) |
1da177e4 LT |
1002 | device->flags.removable = 1; |
1003 | ||
1004 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ | |
952c63e9 JL |
1005 | if (acpi_has_method(device->handle, "_EJD") || |
1006 | acpi_has_method(device->handle, "_EJ0")) | |
1da177e4 | 1007 | device->flags.ejectable = 1; |
1da177e4 LT |
1008 | } |
1009 | ||
c7bcb4e9 | 1010 | static void acpi_device_get_busid(struct acpi_device *device) |
1da177e4 | 1011 | { |
4be44fcd LB |
1012 | char bus_id[5] = { '?', 0 }; |
1013 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; | |
1014 | int i = 0; | |
1da177e4 LT |
1015 | |
1016 | /* | |
1017 | * Bus ID | |
1018 | * ------ | |
1019 | * The device's Bus ID is simply the object name. | |
1020 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? | |
1021 | */ | |
859ac9a4 | 1022 | if (ACPI_IS_ROOT_DEVICE(device)) { |
1da177e4 | 1023 | strcpy(device->pnp.bus_id, "ACPI"); |
859ac9a4 BH |
1024 | return; |
1025 | } | |
1026 | ||
1027 | switch (device->device_type) { | |
1da177e4 LT |
1028 | case ACPI_BUS_TYPE_POWER_BUTTON: |
1029 | strcpy(device->pnp.bus_id, "PWRF"); | |
1030 | break; | |
1031 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
1032 | strcpy(device->pnp.bus_id, "SLPF"); | |
1033 | break; | |
1034 | default: | |
66b7ed40 | 1035 | acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); |
1da177e4 LT |
1036 | /* Clean up trailing underscores (if any) */ |
1037 | for (i = 3; i > 1; i--) { | |
1038 | if (bus_id[i] == '_') | |
1039 | bus_id[i] = '\0'; | |
1040 | else | |
1041 | break; | |
1042 | } | |
1043 | strcpy(device->pnp.bus_id, bus_id); | |
1044 | break; | |
1045 | } | |
1046 | } | |
1047 | ||
ebf4df8d JL |
1048 | /* |
1049 | * acpi_ata_match - see if an acpi object is an ATA device | |
1050 | * | |
1051 | * If an acpi object has one of the ACPI ATA methods defined, | |
1052 | * then we can safely call it an ATA device. | |
1053 | */ | |
1054 | bool acpi_ata_match(acpi_handle handle) | |
1055 | { | |
1056 | return acpi_has_method(handle, "_GTF") || | |
1057 | acpi_has_method(handle, "_GTM") || | |
1058 | acpi_has_method(handle, "_STM") || | |
1059 | acpi_has_method(handle, "_SDD"); | |
1060 | } | |
1061 | ||
54735266 | 1062 | /* |
d4e1a692 | 1063 | * acpi_bay_match - see if an acpi object is an ejectable driver bay |
54735266 ZR |
1064 | * |
1065 | * If an acpi object is ejectable and has one of the ACPI ATA methods defined, | |
1066 | * then we can safely call it an ejectable drive bay | |
1067 | */ | |
ebf4df8d | 1068 | bool acpi_bay_match(acpi_handle handle) |
d4e1a692 | 1069 | { |
54735266 ZR |
1070 | acpi_handle phandle; |
1071 | ||
952c63e9 | 1072 | if (!acpi_has_method(handle, "_EJ0")) |
ebf4df8d JL |
1073 | return false; |
1074 | if (acpi_ata_match(handle)) | |
1075 | return true; | |
1076 | if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) | |
1077 | return false; | |
54735266 | 1078 | |
ebf4df8d | 1079 | return acpi_ata_match(phandle); |
54735266 ZR |
1080 | } |
1081 | ||
b43109fa | 1082 | bool acpi_device_is_battery(struct acpi_device *adev) |
1e2380cd | 1083 | { |
b43109fa | 1084 | struct acpi_hardware_id *hwid; |
1e2380cd | 1085 | |
b43109fa RW |
1086 | list_for_each_entry(hwid, &adev->pnp.ids, list) |
1087 | if (!strcmp("PNP0C0A", hwid->id)) | |
1088 | return true; | |
1e2380cd | 1089 | |
b43109fa | 1090 | return false; |
1e2380cd RW |
1091 | } |
1092 | ||
b43109fa | 1093 | static bool is_ejectable_bay(struct acpi_device *adev) |
1e2380cd | 1094 | { |
b43109fa RW |
1095 | acpi_handle handle = adev->handle; |
1096 | ||
1097 | if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev)) | |
1e2380cd RW |
1098 | return true; |
1099 | ||
1100 | return acpi_bay_match(handle); | |
1101 | } | |
1102 | ||
3620f2f2 | 1103 | /* |
d4e1a692 | 1104 | * acpi_dock_match - see if an acpi object has a _DCK method |
3620f2f2 | 1105 | */ |
ebf4df8d | 1106 | bool acpi_dock_match(acpi_handle handle) |
3620f2f2 | 1107 | { |
ebf4df8d | 1108 | return acpi_has_method(handle, "_DCK"); |
3620f2f2 FS |
1109 | } |
1110 | ||
adc8bb8e HG |
1111 | static acpi_status |
1112 | acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context, | |
1113 | void **return_value) | |
1114 | { | |
1115 | long *cap = context; | |
1116 | ||
1117 | if (acpi_has_method(handle, "_BCM") && | |
1118 | acpi_has_method(handle, "_BCL")) { | |
1119 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight " | |
1120 | "support\n")); | |
1121 | *cap |= ACPI_VIDEO_BACKLIGHT; | |
1122 | if (!acpi_has_method(handle, "_BQC")) | |
1123 | printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, " | |
1124 | "cannot determine initial brightness\n"); | |
1125 | /* We have backlight support, no need to scan further */ | |
1126 | return AE_CTRL_TERMINATE; | |
1127 | } | |
1128 | return 0; | |
1129 | } | |
1130 | ||
1131 | /* Returns true if the ACPI object is a video device which can be | |
1132 | * handled by video.ko. | |
1133 | * The device will get a Linux specific CID added in scan.c to | |
1134 | * identify the device as an ACPI graphics device | |
1135 | * Be aware that the graphics device may not be physically present | |
1136 | * Use acpi_video_get_capabilities() to detect general ACPI video | |
1137 | * capabilities of present cards | |
1138 | */ | |
1139 | long acpi_is_video_device(acpi_handle handle) | |
1140 | { | |
1141 | long video_caps = 0; | |
1142 | ||
1143 | /* Is this device able to support video switching ? */ | |
1144 | if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS")) | |
1145 | video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING; | |
1146 | ||
1147 | /* Is this device able to retrieve a video ROM ? */ | |
1148 | if (acpi_has_method(handle, "_ROM")) | |
1149 | video_caps |= ACPI_VIDEO_ROM_AVAILABLE; | |
1150 | ||
1151 | /* Is this device able to configure which video head to be POSTed ? */ | |
1152 | if (acpi_has_method(handle, "_VPO") && | |
1153 | acpi_has_method(handle, "_GPD") && | |
1154 | acpi_has_method(handle, "_SPD")) | |
1155 | video_caps |= ACPI_VIDEO_DEVICE_POSTING; | |
1156 | ||
1157 | /* Only check for backlight functionality if one of the above hit. */ | |
1158 | if (video_caps) | |
1159 | acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, | |
1160 | ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL, | |
1161 | &video_caps, NULL); | |
1162 | ||
1163 | return video_caps; | |
1164 | } | |
1165 | EXPORT_SYMBOL(acpi_is_video_device); | |
1166 | ||
620e112c | 1167 | const char *acpi_device_hid(struct acpi_device *device) |
15b8dd53 | 1168 | { |
7f47fa6c | 1169 | struct acpi_hardware_id *hid; |
15b8dd53 | 1170 | |
2b2ae7c7 TR |
1171 | if (list_empty(&device->pnp.ids)) |
1172 | return dummy_hid; | |
1173 | ||
7f47fa6c BH |
1174 | hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); |
1175 | return hid->id; | |
1176 | } | |
1177 | EXPORT_SYMBOL(acpi_device_hid); | |
15b8dd53 | 1178 | |
d4e1a692 | 1179 | static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) |
7f47fa6c BH |
1180 | { |
1181 | struct acpi_hardware_id *id; | |
15b8dd53 | 1182 | |
7f47fa6c BH |
1183 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
1184 | if (!id) | |
1185 | return; | |
15b8dd53 | 1186 | |
581de59e | 1187 | id->id = kstrdup(dev_id, GFP_KERNEL); |
7f47fa6c BH |
1188 | if (!id->id) { |
1189 | kfree(id); | |
1190 | return; | |
15b8dd53 BM |
1191 | } |
1192 | ||
d4e1a692 TK |
1193 | list_add_tail(&id->list, &pnp->ids); |
1194 | pnp->type.hardware_id = 1; | |
15b8dd53 BM |
1195 | } |
1196 | ||
222e82ac DW |
1197 | /* |
1198 | * Old IBM workstations have a DSDT bug wherein the SMBus object | |
1199 | * lacks the SMBUS01 HID and the methods do not have the necessary "_" | |
1200 | * prefix. Work around this. | |
1201 | */ | |
ebf4df8d | 1202 | static bool acpi_ibm_smbus_match(acpi_handle handle) |
222e82ac | 1203 | { |
ebf4df8d JL |
1204 | char node_name[ACPI_PATH_SEGMENT_LENGTH]; |
1205 | struct acpi_buffer path = { sizeof(node_name), node_name }; | |
222e82ac DW |
1206 | |
1207 | if (!dmi_name_in_vendors("IBM")) | |
ebf4df8d | 1208 | return false; |
222e82ac DW |
1209 | |
1210 | /* Look for SMBS object */ | |
ebf4df8d JL |
1211 | if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || |
1212 | strcmp("SMBS", path.pointer)) | |
1213 | return false; | |
222e82ac DW |
1214 | |
1215 | /* Does it have the necessary (but misnamed) methods? */ | |
952c63e9 JL |
1216 | if (acpi_has_method(handle, "SBI") && |
1217 | acpi_has_method(handle, "SBR") && | |
1218 | acpi_has_method(handle, "SBW")) | |
ebf4df8d JL |
1219 | return true; |
1220 | ||
1221 | return false; | |
222e82ac DW |
1222 | } |
1223 | ||
ae3caa80 JL |
1224 | static bool acpi_object_is_system_bus(acpi_handle handle) |
1225 | { | |
1226 | acpi_handle tmp; | |
1227 | ||
1228 | if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) && | |
1229 | tmp == handle) | |
1230 | return true; | |
1231 | if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) && | |
1232 | tmp == handle) | |
1233 | return true; | |
1234 | ||
1235 | return false; | |
1236 | } | |
1237 | ||
c0af4175 TK |
1238 | static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, |
1239 | int device_type) | |
1da177e4 | 1240 | { |
4be44fcd | 1241 | acpi_status status; |
57f3674f | 1242 | struct acpi_device_info *info; |
78e25fef | 1243 | struct acpi_pnp_device_id_list *cid_list; |
7f47fa6c | 1244 | int i; |
1da177e4 | 1245 | |
c0af4175 | 1246 | switch (device_type) { |
1da177e4 | 1247 | case ACPI_BUS_TYPE_DEVICE: |
c0af4175 TK |
1248 | if (handle == ACPI_ROOT_OBJECT) { |
1249 | acpi_add_id(pnp, ACPI_SYSTEM_HID); | |
859ac9a4 BH |
1250 | break; |
1251 | } | |
1252 | ||
c0af4175 | 1253 | status = acpi_get_object_info(handle, &info); |
1da177e4 | 1254 | if (ACPI_FAILURE(status)) { |
c0af4175 TK |
1255 | pr_err(PREFIX "%s: Error reading device info\n", |
1256 | __func__); | |
1da177e4 LT |
1257 | return; |
1258 | } | |
1259 | ||
549e6845 | 1260 | if (info->valid & ACPI_VALID_HID) { |
c0af4175 | 1261 | acpi_add_id(pnp, info->hardware_id.string); |
549e6845 RW |
1262 | pnp->type.platform_id = 1; |
1263 | } | |
57f3674f | 1264 | if (info->valid & ACPI_VALID_CID) { |
15b8dd53 | 1265 | cid_list = &info->compatible_id_list; |
57f3674f | 1266 | for (i = 0; i < cid_list->count; i++) |
c0af4175 | 1267 | acpi_add_id(pnp, cid_list->ids[i].string); |
57f3674f | 1268 | } |
1da177e4 | 1269 | if (info->valid & ACPI_VALID_ADR) { |
c0af4175 TK |
1270 | pnp->bus_address = info->address; |
1271 | pnp->type.bus_address = 1; | |
1da177e4 | 1272 | } |
ccf78040 | 1273 | if (info->valid & ACPI_VALID_UID) |
c0af4175 | 1274 | pnp->unique_id = kstrdup(info->unique_id.string, |
ccf78040 | 1275 | GFP_KERNEL); |
26095a01 SS |
1276 | if (info->valid & ACPI_VALID_CLS) |
1277 | acpi_add_id(pnp, info->class_code.string); | |
ae843332 | 1278 | |
a83893ae BH |
1279 | kfree(info); |
1280 | ||
57f3674f BH |
1281 | /* |
1282 | * Some devices don't reliably have _HIDs & _CIDs, so add | |
1283 | * synthetic HIDs to make sure drivers can find them. | |
1284 | */ | |
c0af4175 TK |
1285 | if (acpi_is_video_device(handle)) |
1286 | acpi_add_id(pnp, ACPI_VIDEO_HID); | |
ebf4df8d | 1287 | else if (acpi_bay_match(handle)) |
c0af4175 | 1288 | acpi_add_id(pnp, ACPI_BAY_HID); |
ebf4df8d | 1289 | else if (acpi_dock_match(handle)) |
c0af4175 | 1290 | acpi_add_id(pnp, ACPI_DOCK_HID); |
ebf4df8d | 1291 | else if (acpi_ibm_smbus_match(handle)) |
c0af4175 | 1292 | acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); |
ae3caa80 JL |
1293 | else if (list_empty(&pnp->ids) && |
1294 | acpi_object_is_system_bus(handle)) { | |
1295 | /* \_SB, \_TZ, LNXSYBUS */ | |
1296 | acpi_add_id(pnp, ACPI_BUS_HID); | |
c0af4175 TK |
1297 | strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); |
1298 | strcpy(pnp->device_class, ACPI_BUS_CLASS); | |
b7b30de5 | 1299 | } |
54735266 | 1300 | |
1da177e4 LT |
1301 | break; |
1302 | case ACPI_BUS_TYPE_POWER: | |
c0af4175 | 1303 | acpi_add_id(pnp, ACPI_POWER_HID); |
1da177e4 LT |
1304 | break; |
1305 | case ACPI_BUS_TYPE_PROCESSOR: | |
c0af4175 | 1306 | acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); |
1da177e4 | 1307 | break; |
1da177e4 | 1308 | case ACPI_BUS_TYPE_THERMAL: |
c0af4175 | 1309 | acpi_add_id(pnp, ACPI_THERMAL_HID); |
1da177e4 LT |
1310 | break; |
1311 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
c0af4175 | 1312 | acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); |
1da177e4 LT |
1313 | break; |
1314 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
c0af4175 | 1315 | acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); |
1da177e4 LT |
1316 | break; |
1317 | } | |
1da177e4 LT |
1318 | } |
1319 | ||
c0af4175 TK |
1320 | void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) |
1321 | { | |
1322 | struct acpi_hardware_id *id, *tmp; | |
1323 | ||
1324 | list_for_each_entry_safe(id, tmp, &pnp->ids, list) { | |
1325 | kfree(id->id); | |
1326 | kfree(id); | |
1327 | } | |
1328 | kfree(pnp->unique_id); | |
1329 | } | |
1330 | ||
d0562674 SS |
1331 | static void acpi_init_coherency(struct acpi_device *adev) |
1332 | { | |
1333 | unsigned long long cca = 0; | |
1334 | acpi_status status; | |
1335 | struct acpi_device *parent = adev->parent; | |
1336 | ||
1337 | if (parent && parent->flags.cca_seen) { | |
1338 | /* | |
1339 | * From ACPI spec, OSPM will ignore _CCA if an ancestor | |
1340 | * already saw one. | |
1341 | */ | |
1342 | adev->flags.cca_seen = 1; | |
1343 | cca = parent->flags.coherent_dma; | |
1344 | } else { | |
1345 | status = acpi_evaluate_integer(adev->handle, "_CCA", | |
1346 | NULL, &cca); | |
1347 | if (ACPI_SUCCESS(status)) | |
1348 | adev->flags.cca_seen = 1; | |
1349 | else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED)) | |
1350 | /* | |
1351 | * If architecture does not specify that _CCA is | |
1352 | * required for DMA-able devices (e.g. x86), | |
1353 | * we default to _CCA=1. | |
1354 | */ | |
1355 | cca = 1; | |
1356 | else | |
1357 | acpi_handle_debug(adev->handle, | |
1358 | "ACPI device is missing _CCA.\n"); | |
1359 | } | |
1360 | ||
1361 | adev->flags.coherent_dma = cca; | |
1362 | } | |
1363 | ||
82c7d5ef RW |
1364 | void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, |
1365 | int type, unsigned long long sta) | |
1da177e4 | 1366 | { |
d43e167d RW |
1367 | INIT_LIST_HEAD(&device->pnp.ids); |
1368 | device->device_type = type; | |
1369 | device->handle = handle; | |
1370 | device->parent = acpi_bus_get_parent(handle); | |
8a0662d9 | 1371 | device->fwnode.type = FWNODE_ACPI; |
25db115b | 1372 | acpi_set_device_status(device, sta); |
d43e167d | 1373 | acpi_device_get_busid(device); |
c0af4175 | 1374 | acpi_set_pnp_ids(handle, &device->pnp, type); |
ffdcd955 | 1375 | acpi_init_properties(device); |
d43e167d | 1376 | acpi_bus_get_flags(device); |
2c0d4fe0 | 1377 | device->flags.match_driver = false; |
202317a5 RW |
1378 | device->flags.initialized = true; |
1379 | device->flags.visited = false; | |
cf860be6 RW |
1380 | device_initialize(&device->dev); |
1381 | dev_set_uevent_suppress(&device->dev, true); | |
d0562674 | 1382 | acpi_init_coherency(device); |
cf860be6 | 1383 | } |
bc3b0772 | 1384 | |
cf860be6 RW |
1385 | void acpi_device_add_finalize(struct acpi_device *device) |
1386 | { | |
1387 | dev_set_uevent_suppress(&device->dev, false); | |
1388 | kobject_uevent(&device->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
1389 | } |
1390 | ||
5c478f49 BH |
1391 | static int acpi_add_single_object(struct acpi_device **child, |
1392 | acpi_handle handle, int type, | |
2c0d4fe0 | 1393 | unsigned long long sta) |
1da177e4 | 1394 | { |
77c24888 BH |
1395 | int result; |
1396 | struct acpi_device *device; | |
29aaefa6 | 1397 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1da177e4 | 1398 | |
36bcbec7 | 1399 | device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
1da177e4 | 1400 | if (!device) { |
6468463a | 1401 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
d550d98d | 1402 | return -ENOMEM; |
1da177e4 | 1403 | } |
1da177e4 | 1404 | |
d43e167d RW |
1405 | acpi_init_device_object(device, handle, type, sta); |
1406 | acpi_bus_get_power_flags(device); | |
d57d09a4 | 1407 | acpi_bus_get_wakeup_device_flags(device); |
1da177e4 | 1408 | |
cf860be6 | 1409 | result = acpi_device_add(device, acpi_device_release); |
d43e167d | 1410 | if (result) { |
718fb0de | 1411 | acpi_device_release(&device->dev); |
d43e167d RW |
1412 | return result; |
1413 | } | |
1da177e4 | 1414 | |
d43e167d | 1415 | acpi_power_add_remove_device(device, true); |
cf860be6 | 1416 | acpi_device_add_finalize(device); |
d43e167d RW |
1417 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
1418 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n", | |
1419 | dev_name(&device->dev), (char *) buffer.pointer, | |
1420 | device->parent ? dev_name(&device->parent->dev) : "(null)")); | |
1421 | kfree(buffer.pointer); | |
1422 | *child = device; | |
1423 | return 0; | |
bf325f95 RW |
1424 | } |
1425 | ||
778cbc1d BH |
1426 | static int acpi_bus_type_and_status(acpi_handle handle, int *type, |
1427 | unsigned long long *sta) | |
1da177e4 | 1428 | { |
778cbc1d BH |
1429 | acpi_status status; |
1430 | acpi_object_type acpi_type; | |
1da177e4 | 1431 | |
778cbc1d | 1432 | status = acpi_get_type(handle, &acpi_type); |
51a85faf | 1433 | if (ACPI_FAILURE(status)) |
778cbc1d | 1434 | return -ENODEV; |
4be44fcd | 1435 | |
778cbc1d | 1436 | switch (acpi_type) { |
51a85faf BH |
1437 | case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ |
1438 | case ACPI_TYPE_DEVICE: | |
778cbc1d BH |
1439 | *type = ACPI_BUS_TYPE_DEVICE; |
1440 | status = acpi_bus_get_status_handle(handle, sta); | |
1441 | if (ACPI_FAILURE(status)) | |
1442 | return -ENODEV; | |
51a85faf BH |
1443 | break; |
1444 | case ACPI_TYPE_PROCESSOR: | |
778cbc1d BH |
1445 | *type = ACPI_BUS_TYPE_PROCESSOR; |
1446 | status = acpi_bus_get_status_handle(handle, sta); | |
1447 | if (ACPI_FAILURE(status)) | |
1448 | return -ENODEV; | |
51a85faf BH |
1449 | break; |
1450 | case ACPI_TYPE_THERMAL: | |
778cbc1d BH |
1451 | *type = ACPI_BUS_TYPE_THERMAL; |
1452 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1453 | break; |
1454 | case ACPI_TYPE_POWER: | |
778cbc1d BH |
1455 | *type = ACPI_BUS_TYPE_POWER; |
1456 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1457 | break; |
1458 | default: | |
778cbc1d | 1459 | return -ENODEV; |
51a85faf | 1460 | } |
1da177e4 | 1461 | |
778cbc1d BH |
1462 | return 0; |
1463 | } | |
1464 | ||
202317a5 RW |
1465 | bool acpi_device_is_present(struct acpi_device *adev) |
1466 | { | |
1467 | if (adev->status.present || adev->status.functional) | |
1468 | return true; | |
1469 | ||
1470 | adev->flags.initialized = false; | |
1471 | return false; | |
1472 | } | |
1473 | ||
4b59cc1f RW |
1474 | static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, |
1475 | char *idstr, | |
1476 | const struct acpi_device_id **matchid) | |
1477 | { | |
1478 | const struct acpi_device_id *devid; | |
1479 | ||
aca0a4eb RW |
1480 | if (handler->match) |
1481 | return handler->match(idstr, matchid); | |
1482 | ||
4b59cc1f RW |
1483 | for (devid = handler->ids; devid->id[0]; devid++) |
1484 | if (!strcmp((char *)devid->id, idstr)) { | |
1485 | if (matchid) | |
1486 | *matchid = devid; | |
1487 | ||
1488 | return true; | |
1489 | } | |
1490 | ||
1491 | return false; | |
1492 | } | |
1493 | ||
6b772e8f TK |
1494 | static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr, |
1495 | const struct acpi_device_id **matchid) | |
1496 | { | |
1497 | struct acpi_scan_handler *handler; | |
1498 | ||
1499 | list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) | |
1500 | if (acpi_scan_handler_matching(handler, idstr, matchid)) | |
1501 | return handler; | |
1502 | ||
1503 | return NULL; | |
1504 | } | |
1505 | ||
3f8055c3 RW |
1506 | void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) |
1507 | { | |
3f8055c3 RW |
1508 | if (!!hotplug->enabled == !!val) |
1509 | return; | |
1510 | ||
1511 | mutex_lock(&acpi_scan_lock); | |
1512 | ||
1513 | hotplug->enabled = val; | |
3f8055c3 RW |
1514 | |
1515 | mutex_unlock(&acpi_scan_lock); | |
1516 | } | |
1517 | ||
3c2cc7ff | 1518 | static void acpi_scan_init_hotplug(struct acpi_device *adev) |
a33ec399 | 1519 | { |
6b772e8f | 1520 | struct acpi_hardware_id *hwid; |
a33ec399 | 1521 | |
b43109fa | 1522 | if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) { |
1e2380cd RW |
1523 | acpi_dock_add(adev); |
1524 | return; | |
1525 | } | |
3c2cc7ff RW |
1526 | list_for_each_entry(hwid, &adev->pnp.ids, list) { |
1527 | struct acpi_scan_handler *handler; | |
a33ec399 | 1528 | |
6b772e8f | 1529 | handler = acpi_scan_match_handler(hwid->id, NULL); |
1a699476 RW |
1530 | if (handler) { |
1531 | adev->flags.hotplug_notify = true; | |
1532 | break; | |
1533 | } | |
3c2cc7ff | 1534 | } |
a33ec399 RW |
1535 | } |
1536 | ||
40e7fcb1 LT |
1537 | static void acpi_device_dep_initialize(struct acpi_device *adev) |
1538 | { | |
1539 | struct acpi_dep_data *dep; | |
1540 | struct acpi_handle_list dep_devices; | |
1541 | acpi_status status; | |
1542 | int i; | |
1543 | ||
1544 | if (!acpi_has_method(adev->handle, "_DEP")) | |
1545 | return; | |
1546 | ||
1547 | status = acpi_evaluate_reference(adev->handle, "_DEP", NULL, | |
1548 | &dep_devices); | |
1549 | if (ACPI_FAILURE(status)) { | |
80167a24 | 1550 | dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n"); |
40e7fcb1 LT |
1551 | return; |
1552 | } | |
1553 | ||
1554 | for (i = 0; i < dep_devices.count; i++) { | |
1555 | struct acpi_device_info *info; | |
1556 | int skip; | |
1557 | ||
1558 | status = acpi_get_object_info(dep_devices.handles[i], &info); | |
1559 | if (ACPI_FAILURE(status)) { | |
80167a24 | 1560 | dev_dbg(&adev->dev, "Error reading _DEP device info\n"); |
40e7fcb1 LT |
1561 | continue; |
1562 | } | |
1563 | ||
1564 | /* | |
1565 | * Skip the dependency of Windows System Power | |
1566 | * Management Controller | |
1567 | */ | |
1568 | skip = info->valid & ACPI_VALID_HID && | |
1569 | !strcmp(info->hardware_id.string, "INT3396"); | |
1570 | ||
1571 | kfree(info); | |
1572 | ||
1573 | if (skip) | |
1574 | continue; | |
1575 | ||
1576 | dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL); | |
1577 | if (!dep) | |
1578 | return; | |
1579 | ||
1580 | dep->master = dep_devices.handles[i]; | |
1581 | dep->slave = adev->handle; | |
1582 | adev->dep_unmet++; | |
1583 | ||
1584 | mutex_lock(&acpi_dep_list_lock); | |
1585 | list_add_tail(&dep->node , &acpi_dep_list); | |
1586 | mutex_unlock(&acpi_dep_list_lock); | |
1587 | } | |
1588 | } | |
1589 | ||
e3863094 RW |
1590 | static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, |
1591 | void *not_used, void **return_value) | |
778cbc1d | 1592 | { |
805d410f | 1593 | struct acpi_device *device = NULL; |
778cbc1d BH |
1594 | int type; |
1595 | unsigned long long sta; | |
1596 | int result; | |
1597 | ||
4002bf38 RW |
1598 | acpi_bus_get_device(handle, &device); |
1599 | if (device) | |
1600 | goto out; | |
1601 | ||
778cbc1d BH |
1602 | result = acpi_bus_type_and_status(handle, &type, &sta); |
1603 | if (result) | |
1604 | return AE_OK; | |
1605 | ||
82c7d5ef RW |
1606 | if (type == ACPI_BUS_TYPE_POWER) { |
1607 | acpi_add_power_resource(handle); | |
1608 | return AE_OK; | |
1609 | } | |
1610 | ||
2c0d4fe0 | 1611 | acpi_add_single_object(&device, handle, type, sta); |
e3b87f8a | 1612 | if (!device) |
51a85faf | 1613 | return AE_CTRL_DEPTH; |
1da177e4 | 1614 | |
3c2cc7ff | 1615 | acpi_scan_init_hotplug(device); |
40e7fcb1 | 1616 | acpi_device_dep_initialize(device); |
3c2cc7ff | 1617 | |
4002bf38 | 1618 | out: |
51a85faf BH |
1619 | if (!*return_value) |
1620 | *return_value = device; | |
805d410f | 1621 | |
51a85faf BH |
1622 | return AE_OK; |
1623 | } | |
3fb02738 | 1624 | |
48459340 ZR |
1625 | static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data) |
1626 | { | |
1627 | bool *is_spi_i2c_slave_p = data; | |
1628 | ||
1629 | if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) | |
1630 | return 1; | |
1631 | ||
1632 | /* | |
1633 | * devices that are connected to UART still need to be enumerated to | |
1634 | * platform bus | |
1635 | */ | |
1636 | if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART) | |
1637 | *is_spi_i2c_slave_p = true; | |
1638 | ||
1639 | /* no need to do more checking */ | |
1640 | return -1; | |
1641 | } | |
1642 | ||
1643 | static void acpi_default_enumeration(struct acpi_device *device) | |
1644 | { | |
1645 | struct list_head resource_list; | |
1646 | bool is_spi_i2c_slave = false; | |
1647 | ||
48459340 ZR |
1648 | /* |
1649 | * Do not enemerate SPI/I2C slaves as they will be enuerated by their | |
1650 | * respective parents. | |
1651 | */ | |
1652 | INIT_LIST_HEAD(&resource_list); | |
1653 | acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave, | |
1654 | &is_spi_i2c_slave); | |
1655 | acpi_dev_free_resource_list(&resource_list); | |
1656 | if (!is_spi_i2c_slave) | |
1657 | acpi_create_platform_device(device); | |
1658 | } | |
1659 | ||
7d284352 | 1660 | static const struct acpi_device_id generic_device_ids[] = { |
ee892094 | 1661 | {ACPI_DT_NAMESPACE_HID, }, |
7d284352 RW |
1662 | {"", }, |
1663 | }; | |
1664 | ||
1665 | static int acpi_generic_device_attach(struct acpi_device *adev, | |
1666 | const struct acpi_device_id *not_used) | |
1667 | { | |
1668 | /* | |
ee892094 RW |
1669 | * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test |
1670 | * below can be unconditional. | |
7d284352 RW |
1671 | */ |
1672 | if (adev->data.of_compatible) | |
1673 | acpi_default_enumeration(adev); | |
1674 | ||
1675 | return 1; | |
1676 | } | |
1677 | ||
1678 | static struct acpi_scan_handler generic_device_handler = { | |
1679 | .ids = generic_device_ids, | |
1680 | .attach = acpi_generic_device_attach, | |
1681 | }; | |
1682 | ||
c5698074 | 1683 | static int acpi_scan_attach_handler(struct acpi_device *device) |
ca589f94 | 1684 | { |
c5698074 RW |
1685 | struct acpi_hardware_id *hwid; |
1686 | int ret = 0; | |
ca589f94 | 1687 | |
c5698074 | 1688 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
87b85b3c | 1689 | const struct acpi_device_id *devid; |
c5698074 | 1690 | struct acpi_scan_handler *handler; |
ca589f94 | 1691 | |
c5698074 RW |
1692 | handler = acpi_scan_match_handler(hwid->id, &devid); |
1693 | if (handler) { | |
d34afa9d RW |
1694 | if (!handler->attach) { |
1695 | device->pnp.type.platform_id = 0; | |
1696 | continue; | |
1697 | } | |
9cb32acf | 1698 | device->handler = handler; |
87b85b3c | 1699 | ret = handler->attach(device, devid); |
9cb32acf | 1700 | if (ret > 0) |
c5698074 | 1701 | break; |
9cb32acf RW |
1702 | |
1703 | device->handler = NULL; | |
1704 | if (ret < 0) | |
c5698074 | 1705 | break; |
ca589f94 RW |
1706 | } |
1707 | } | |
48459340 | 1708 | |
ca589f94 RW |
1709 | return ret; |
1710 | } | |
1711 | ||
2c22e652 | 1712 | static void acpi_bus_attach(struct acpi_device *device) |
51a85faf | 1713 | { |
2c22e652 | 1714 | struct acpi_device *child; |
1e2380cd | 1715 | acpi_handle ejd; |
ca589f94 | 1716 | int ret; |
3fb02738 | 1717 | |
1e2380cd RW |
1718 | if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd))) |
1719 | register_dock_dependent_device(device, ejd); | |
1720 | ||
2c22e652 | 1721 | acpi_bus_get_status(device); |
202317a5 | 1722 | /* Skip devices that are not present. */ |
2c22e652 RW |
1723 | if (!acpi_device_is_present(device)) { |
1724 | device->flags.visited = false; | |
1b1f3e16 | 1725 | device->flags.power_manageable = 0; |
2c22e652 RW |
1726 | return; |
1727 | } | |
3a391a39 | 1728 | if (device->handler) |
2c22e652 | 1729 | goto ok; |
3a391a39 | 1730 | |
202317a5 | 1731 | if (!device->flags.initialized) { |
1b1f3e16 RW |
1732 | device->flags.power_manageable = |
1733 | device->power.states[ACPI_STATE_D0].flags.valid; | |
1734 | if (acpi_bus_init_power(device)) | |
1735 | device->flags.power_manageable = 0; | |
1736 | ||
202317a5 RW |
1737 | device->flags.initialized = true; |
1738 | } | |
2c22e652 | 1739 | device->flags.visited = false; |
ca589f94 | 1740 | ret = acpi_scan_attach_handler(device); |
6931007c | 1741 | if (ret < 0) |
2c22e652 | 1742 | return; |
6931007c RW |
1743 | |
1744 | device->flags.match_driver = true; | |
2c22e652 RW |
1745 | if (!ret) { |
1746 | ret = device_attach(&device->dev); | |
1747 | if (ret < 0) | |
1748 | return; | |
7d284352 RW |
1749 | |
1750 | if (!ret && device->pnp.type.platform_id) | |
1751 | acpi_default_enumeration(device); | |
2c22e652 | 1752 | } |
202317a5 | 1753 | device->flags.visited = true; |
202317a5 | 1754 | |
2c22e652 RW |
1755 | ok: |
1756 | list_for_each_entry(child, &device->children, node) | |
1757 | acpi_bus_attach(child); | |
8ab17fc9 RW |
1758 | |
1759 | if (device->handler && device->handler->hotplug.notify_online) | |
1760 | device->handler->hotplug.notify_online(device); | |
1da177e4 | 1761 | } |
1da177e4 | 1762 | |
40e7fcb1 LT |
1763 | void acpi_walk_dep_device_list(acpi_handle handle) |
1764 | { | |
1765 | struct acpi_dep_data *dep, *tmp; | |
1766 | struct acpi_device *adev; | |
1767 | ||
1768 | mutex_lock(&acpi_dep_list_lock); | |
1769 | list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) { | |
1770 | if (dep->master == handle) { | |
1771 | acpi_bus_get_device(dep->slave, &adev); | |
1772 | if (!adev) | |
1773 | continue; | |
1774 | ||
1775 | adev->dep_unmet--; | |
1776 | if (!adev->dep_unmet) | |
1777 | acpi_bus_attach(adev); | |
1778 | list_del(&dep->node); | |
1779 | kfree(dep); | |
1780 | } | |
1781 | } | |
1782 | mutex_unlock(&acpi_dep_list_lock); | |
1783 | } | |
1784 | EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list); | |
1785 | ||
636458de | 1786 | /** |
b8bd759a | 1787 | * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. |
636458de | 1788 | * @handle: Root of the namespace scope to scan. |
7779688f | 1789 | * |
636458de RW |
1790 | * Scan a given ACPI tree (probably recently hot-plugged) and create and add |
1791 | * found devices. | |
7779688f | 1792 | * |
636458de RW |
1793 | * If no devices were found, -ENODEV is returned, but it does not mean that |
1794 | * there has been a real error. There just have been no suitable ACPI objects | |
1795 | * in the table trunk from which the kernel could create a device and add an | |
1796 | * appropriate driver. | |
3757b948 RW |
1797 | * |
1798 | * Must be called under acpi_scan_lock. | |
7779688f | 1799 | */ |
b8bd759a | 1800 | int acpi_bus_scan(acpi_handle handle) |
3fb02738 | 1801 | { |
b8bd759a | 1802 | void *device = NULL; |
3fb02738 | 1803 | |
b8bd759a RW |
1804 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device))) |
1805 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
1806 | acpi_bus_check_add, NULL, NULL, &device); | |
3fb02738 | 1807 | |
2c22e652 RW |
1808 | if (device) { |
1809 | acpi_bus_attach(device); | |
1810 | return 0; | |
05404d8f | 1811 | } |
2c22e652 | 1812 | return -ENODEV; |
3fb02738 | 1813 | } |
2c22e652 | 1814 | EXPORT_SYMBOL(acpi_bus_scan); |
1da177e4 | 1815 | |
3757b948 | 1816 | /** |
2c22e652 RW |
1817 | * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects. |
1818 | * @adev: Root of the ACPI namespace scope to walk. | |
3757b948 RW |
1819 | * |
1820 | * Must be called under acpi_scan_lock. | |
1821 | */ | |
2c22e652 | 1822 | void acpi_bus_trim(struct acpi_device *adev) |
1da177e4 | 1823 | { |
2c22e652 RW |
1824 | struct acpi_scan_handler *handler = adev->handler; |
1825 | struct acpi_device *child; | |
1826 | ||
1827 | list_for_each_entry_reverse(child, &adev->children, node) | |
1828 | acpi_bus_trim(child); | |
1829 | ||
a951c773 | 1830 | adev->flags.match_driver = false; |
2c22e652 RW |
1831 | if (handler) { |
1832 | if (handler->detach) | |
1833 | handler->detach(adev); | |
1834 | ||
1835 | adev->handler = NULL; | |
1836 | } else { | |
1837 | device_release_driver(&adev->dev); | |
1838 | } | |
05404d8f | 1839 | /* |
2c22e652 RW |
1840 | * Most likely, the device is going away, so put it into D3cold before |
1841 | * that. | |
05404d8f | 1842 | */ |
2c22e652 RW |
1843 | acpi_device_set_power(adev, ACPI_STATE_D3_COLD); |
1844 | adev->flags.initialized = false; | |
1845 | adev->flags.visited = false; | |
1da177e4 | 1846 | } |
ceaba663 KA |
1847 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
1848 | ||
e8b945c9 | 1849 | static int acpi_bus_scan_fixed(void) |
1da177e4 | 1850 | { |
4be44fcd | 1851 | int result = 0; |
c4168bff | 1852 | |
1da177e4 LT |
1853 | /* |
1854 | * Enumerate all fixed-feature devices. | |
1855 | */ | |
2c0d4fe0 RW |
1856 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { |
1857 | struct acpi_device *device = NULL; | |
1858 | ||
5c478f49 | 1859 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 1860 | ACPI_BUS_TYPE_POWER_BUTTON, |
2c0d4fe0 RW |
1861 | ACPI_STA_DEFAULT); |
1862 | if (result) | |
1863 | return result; | |
1864 | ||
88346167 | 1865 | device->flags.match_driver = true; |
2c0d4fe0 RW |
1866 | result = device_attach(&device->dev); |
1867 | if (result < 0) | |
1868 | return result; | |
1869 | ||
c10d7a13 | 1870 | device_init_wakeup(&device->dev, true); |
3fb02738 | 1871 | } |
1da177e4 | 1872 | |
2c0d4fe0 RW |
1873 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { |
1874 | struct acpi_device *device = NULL; | |
1875 | ||
5c478f49 | 1876 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 1877 | ACPI_BUS_TYPE_SLEEP_BUTTON, |
2c0d4fe0 RW |
1878 | ACPI_STA_DEFAULT); |
1879 | if (result) | |
1880 | return result; | |
1881 | ||
88346167 | 1882 | device->flags.match_driver = true; |
2c0d4fe0 | 1883 | result = device_attach(&device->dev); |
3fb02738 | 1884 | } |
1da177e4 | 1885 | |
2c0d4fe0 | 1886 | return result < 0 ? result : 0; |
1da177e4 LT |
1887 | } |
1888 | ||
e747f274 | 1889 | int __init acpi_scan_init(void) |
1da177e4 LT |
1890 | { |
1891 | int result; | |
1da177e4 | 1892 | |
92ef2a25 | 1893 | acpi_pci_root_init(); |
4daeaf68 | 1894 | acpi_pci_link_init(); |
ac212b69 | 1895 | acpi_processor_init(); |
f58b082a | 1896 | acpi_lpss_init(); |
92082a88 | 1897 | acpi_apd_init(); |
2fa97feb | 1898 | acpi_cmos_rtc_init(); |
737f1a9f | 1899 | acpi_container_init(); |
0a347644 | 1900 | acpi_memory_hotplug_init(); |
eec15edb | 1901 | acpi_pnp_init(); |
3230bbfc | 1902 | acpi_int340x_thermal_init(); |
97d9a9e9 | 1903 | |
7d284352 RW |
1904 | acpi_scan_add_handler(&generic_device_handler); |
1905 | ||
3757b948 | 1906 | mutex_lock(&acpi_scan_lock); |
1da177e4 LT |
1907 | /* |
1908 | * Enumerate devices in the ACPI namespace. | |
1909 | */ | |
0cd6ac52 RW |
1910 | result = acpi_bus_scan(ACPI_ROOT_OBJECT); |
1911 | if (result) | |
3757b948 | 1912 | goto out; |
1da177e4 | 1913 | |
0cd6ac52 | 1914 | result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); |
1da177e4 | 1915 | if (result) |
3757b948 | 1916 | goto out; |
1da177e4 | 1917 | |
2650ef42 AL |
1918 | /* Fixed feature devices do not exist on HW-reduced platform */ |
1919 | if (!acpi_gbl_reduced_hardware) { | |
1920 | result = acpi_bus_scan_fixed(); | |
1921 | if (result) { | |
1922 | acpi_detach_data(acpi_root->handle, | |
1923 | acpi_scan_drop_device); | |
1924 | acpi_device_del(acpi_root); | |
1925 | put_device(&acpi_root->dev); | |
1926 | goto out; | |
1927 | } | |
b8bd759a | 1928 | } |
1da177e4 | 1929 | |
b8bd759a | 1930 | acpi_update_all_gpes(); |
3757b948 RW |
1931 | |
1932 | out: | |
1933 | mutex_unlock(&acpi_scan_lock); | |
1934 | return result; | |
1da177e4 | 1935 | } |