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 | ||
8acf4108 HG |
6 | #define pr_fmt(fmt) "ACPI: " fmt |
7 | ||
1da177e4 LT |
8 | #include <linux/module.h> |
9 | #include <linux/init.h> | |
5a0e3ad6 | 10 | #include <linux/slab.h> |
9b6d97b6 | 11 | #include <linux/kernel.h> |
1da177e4 | 12 | #include <linux/acpi.h> |
643b8e4d | 13 | #include <linux/acpi_iort.h> |
3cf48554 | 14 | #include <linux/acpi_viot.h> |
11a8c5e3 | 15 | #include <linux/iommu.h> |
74523c90 AK |
16 | #include <linux/signal.h> |
17 | #include <linux/kthread.h> | |
222e82ac | 18 | #include <linux/dmi.h> |
0a0f0d8b | 19 | #include <linux/dma-map-ops.h> |
ca9ef3ab | 20 | #include <linux/platform_data/x86/apple.h> |
ca5999fd | 21 | #include <linux/pgtable.h> |
882c982d | 22 | #include <linux/crc32.h> |
bf2ee8d0 | 23 | #include <linux/dma-direct.h> |
d783156e | 24 | |
e60cc7a6 BH |
25 | #include "internal.h" |
26 | ||
4be44fcd | 27 | extern struct acpi_device *acpi_root; |
1da177e4 LT |
28 | |
29 | #define ACPI_BUS_CLASS "system_bus" | |
29b71a1c | 30 | #define ACPI_BUS_HID "LNXSYBUS" |
1da177e4 LT |
31 | #define ACPI_BUS_DEVICE_NAME "System Bus" |
32 | ||
9256dac0 | 33 | #define INVALID_ACPI_HANDLE ((acpi_handle)ZERO_PAGE(0)) |
d783156e | 34 | |
620e112c | 35 | static const char *dummy_hid = "device"; |
2b2ae7c7 | 36 | |
40e7fcb1 LT |
37 | static LIST_HEAD(acpi_dep_list); |
38 | static DEFINE_MUTEX(acpi_dep_list_lock); | |
2d12b6b3 | 39 | LIST_HEAD(acpi_bus_id_list); |
c511cc19 | 40 | static DEFINE_MUTEX(acpi_scan_lock); |
ca589f94 | 41 | static LIST_HEAD(acpi_scan_handlers_list); |
9090589d | 42 | DEFINE_MUTEX(acpi_device_lock); |
1da177e4 | 43 | LIST_HEAD(acpi_wakeup_device_list); |
e525506f | 44 | static DEFINE_MUTEX(acpi_hp_context_lock); |
1da177e4 | 45 | |
a4e081b0 SZ |
46 | /* |
47 | * The UART device described by the SPCR table is the only object which needs | |
48 | * special-casing. Everything else is covered by ACPI namespace paths in STAO | |
49 | * table. | |
50 | */ | |
51 | static u64 spcr_uart_addr; | |
52 | ||
3757b948 RW |
53 | void acpi_scan_lock_acquire(void) |
54 | { | |
55 | mutex_lock(&acpi_scan_lock); | |
56 | } | |
57 | EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire); | |
58 | ||
59 | void acpi_scan_lock_release(void) | |
60 | { | |
61 | mutex_unlock(&acpi_scan_lock); | |
62 | } | |
63 | EXPORT_SYMBOL_GPL(acpi_scan_lock_release); | |
64 | ||
e525506f RW |
65 | void acpi_lock_hp_context(void) |
66 | { | |
67 | mutex_lock(&acpi_hp_context_lock); | |
68 | } | |
69 | ||
70 | void acpi_unlock_hp_context(void) | |
71 | { | |
72 | mutex_unlock(&acpi_hp_context_lock); | |
73 | } | |
74 | ||
5d513205 RW |
75 | void acpi_initialize_hp_context(struct acpi_device *adev, |
76 | struct acpi_hotplug_context *hp, | |
77 | int (*notify)(struct acpi_device *, u32), | |
78 | void (*uevent)(struct acpi_device *, u32)) | |
79 | { | |
80 | acpi_lock_hp_context(); | |
ba574dc8 RW |
81 | hp->notify = notify; |
82 | hp->uevent = uevent; | |
83 | acpi_set_hp_context(adev, hp); | |
5d513205 RW |
84 | acpi_unlock_hp_context(); |
85 | } | |
86 | EXPORT_SYMBOL_GPL(acpi_initialize_hp_context); | |
87 | ||
ca589f94 RW |
88 | int acpi_scan_add_handler(struct acpi_scan_handler *handler) |
89 | { | |
d34afa9d | 90 | if (!handler) |
ca589f94 RW |
91 | return -EINVAL; |
92 | ||
93 | list_add_tail(&handler->list_node, &acpi_scan_handlers_list); | |
94 | return 0; | |
95 | } | |
96 | ||
3f8055c3 RW |
97 | int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler, |
98 | const char *hotplug_profile_name) | |
99 | { | |
100 | int error; | |
101 | ||
102 | error = acpi_scan_add_handler(handler); | |
103 | if (error) | |
104 | return error; | |
105 | ||
106 | acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name); | |
107 | return 0; | |
108 | } | |
109 | ||
caa73ea1 | 110 | bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent) |
d22ddcbc RW |
111 | { |
112 | struct acpi_device_physical_node *pn; | |
113 | bool offline = true; | |
27664c58 | 114 | char *envp[] = { "EVENT=offline", NULL }; |
d22ddcbc | 115 | |
4c533c80 RW |
116 | /* |
117 | * acpi_container_offline() calls this for all of the container's | |
118 | * children under the container's physical_node_lock lock. | |
119 | */ | |
120 | mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING); | |
d22ddcbc RW |
121 | |
122 | list_for_each_entry(pn, &adev->physical_node_list, node) | |
123 | if (device_supports_offline(pn->dev) && !pn->dev->offline) { | |
caa73ea1 | 124 | if (uevent) |
27664c58 | 125 | kobject_uevent_env(&pn->dev->kobj, KOBJ_CHANGE, envp); |
caa73ea1 | 126 | |
d22ddcbc RW |
127 | offline = false; |
128 | break; | |
129 | } | |
130 | ||
131 | mutex_unlock(&adev->physical_node_lock); | |
132 | return offline; | |
133 | } | |
134 | ||
7f28ddec RW |
135 | static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data, |
136 | void **ret_p) | |
683058e3 | 137 | { |
e3c963c4 | 138 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
683058e3 | 139 | struct acpi_device_physical_node *pn; |
303bfdb1 | 140 | bool second_pass = (bool)data; |
683058e3 RW |
141 | acpi_status status = AE_OK; |
142 | ||
e3c963c4 | 143 | if (!device) |
683058e3 RW |
144 | return AE_OK; |
145 | ||
7f28ddec RW |
146 | if (device->handler && !device->handler->hotplug.enabled) { |
147 | *ret_p = &device->dev; | |
148 | return AE_SUPPORT; | |
149 | } | |
150 | ||
683058e3 RW |
151 | mutex_lock(&device->physical_node_lock); |
152 | ||
153 | list_for_each_entry(pn, &device->physical_node_list, node) { | |
154 | int ret; | |
155 | ||
303bfdb1 RW |
156 | if (second_pass) { |
157 | /* Skip devices offlined by the first pass. */ | |
158 | if (pn->put_online) | |
159 | continue; | |
160 | } else { | |
161 | pn->put_online = false; | |
162 | } | |
683058e3 | 163 | ret = device_offline(pn->dev); |
303bfdb1 RW |
164 | if (ret >= 0) { |
165 | pn->put_online = !ret; | |
166 | } else { | |
167 | *ret_p = pn->dev; | |
168 | if (second_pass) { | |
169 | status = AE_ERROR; | |
170 | break; | |
171 | } | |
683058e3 | 172 | } |
683058e3 RW |
173 | } |
174 | ||
175 | mutex_unlock(&device->physical_node_lock); | |
176 | ||
177 | return status; | |
178 | } | |
179 | ||
7f28ddec RW |
180 | static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data, |
181 | void **ret_p) | |
683058e3 | 182 | { |
e3c963c4 | 183 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
683058e3 RW |
184 | struct acpi_device_physical_node *pn; |
185 | ||
e3c963c4 | 186 | if (!device) |
683058e3 RW |
187 | return AE_OK; |
188 | ||
189 | mutex_lock(&device->physical_node_lock); | |
190 | ||
191 | list_for_each_entry(pn, &device->physical_node_list, node) | |
192 | if (pn->put_online) { | |
193 | device_online(pn->dev); | |
194 | pn->put_online = false; | |
195 | } | |
196 | ||
197 | mutex_unlock(&device->physical_node_lock); | |
198 | ||
199 | return AE_OK; | |
200 | } | |
201 | ||
d22ddcbc | 202 | static int acpi_scan_try_to_offline(struct acpi_device *device) |
1da177e4 | 203 | { |
5993c467 | 204 | acpi_handle handle = device->handle; |
d22ddcbc | 205 | struct device *errdev = NULL; |
a33ec399 | 206 | acpi_status status; |
f058cdf4 | 207 | |
303bfdb1 RW |
208 | /* |
209 | * Carry out two passes here and ignore errors in the first pass, | |
210 | * because if the devices in question are memory blocks and | |
211 | * CONFIG_MEMCG is set, one of the blocks may hold data structures | |
212 | * that the other blocks depend on, but it is not known in advance which | |
213 | * block holds them. | |
214 | * | |
215 | * If the first pass is successful, the second one isn't needed, though. | |
216 | */ | |
7f28ddec RW |
217 | status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
218 | NULL, acpi_bus_offline, (void *)false, | |
219 | (void **)&errdev); | |
220 | if (status == AE_SUPPORT) { | |
221 | dev_warn(errdev, "Offline disabled.\n"); | |
222 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
223 | acpi_bus_online, NULL, NULL, NULL); | |
7f28ddec RW |
224 | return -EPERM; |
225 | } | |
226 | acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev); | |
303bfdb1 RW |
227 | if (errdev) { |
228 | errdev = NULL; | |
683058e3 | 229 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
7f28ddec RW |
230 | NULL, acpi_bus_offline, (void *)true, |
231 | (void **)&errdev); | |
ffc10d82 | 232 | if (!errdev) |
7f28ddec RW |
233 | acpi_bus_offline(handle, 0, (void *)true, |
234 | (void **)&errdev); | |
303bfdb1 | 235 | |
ffc10d82 | 236 | if (errdev) { |
303bfdb1 | 237 | dev_warn(errdev, "Offline failed.\n"); |
7f28ddec | 238 | acpi_bus_online(handle, 0, NULL, NULL); |
303bfdb1 | 239 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, |
7f28ddec RW |
240 | ACPI_UINT32_MAX, acpi_bus_online, |
241 | NULL, NULL, NULL); | |
303bfdb1 RW |
242 | return -EBUSY; |
243 | } | |
683058e3 | 244 | } |
d22ddcbc RW |
245 | return 0; |
246 | } | |
247 | ||
248 | static int acpi_scan_hot_remove(struct acpi_device *device) | |
249 | { | |
250 | acpi_handle handle = device->handle; | |
251 | unsigned long long sta; | |
252 | acpi_status status; | |
253 | ||
ffc10d82 | 254 | if (device->handler && device->handler->hotplug.demand_offline) { |
caa73ea1 | 255 | if (!acpi_scan_is_offline(device, true)) |
d22ddcbc RW |
256 | return -EBUSY; |
257 | } else { | |
258 | int error = acpi_scan_try_to_offline(device); | |
259 | if (error) | |
260 | return error; | |
261 | } | |
683058e3 | 262 | |
e52d9d8c | 263 | acpi_handle_debug(handle, "Ejecting\n"); |
26d46867 | 264 | |
bfee26db | 265 | acpi_bus_trim(device); |
683058e3 | 266 | |
7d2421f8 | 267 | acpi_evaluate_lck(handle, 0); |
1da177e4 LT |
268 | /* |
269 | * TBD: _EJD support. | |
270 | */ | |
7d2421f8 JL |
271 | status = acpi_evaluate_ej0(handle); |
272 | if (status == AE_NOT_FOUND) | |
273 | return -ENODEV; | |
274 | else if (ACPI_FAILURE(status)) | |
275 | return -EIO; | |
1da177e4 | 276 | |
882fd12e TK |
277 | /* |
278 | * Verify if eject was indeed successful. If not, log an error | |
279 | * message. No need to call _OST since _EJ0 call was made OK. | |
280 | */ | |
281 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
282 | if (ACPI_FAILURE(status)) { | |
283 | acpi_handle_warn(handle, | |
284 | "Status check after eject failed (0x%x)\n", status); | |
285 | } else if (sta & ACPI_STA_DEVICE_ENABLED) { | |
286 | acpi_handle_warn(handle, | |
287 | "Eject incomplete - status 0x%llx\n", sta); | |
288 | } | |
289 | ||
a33ec399 RW |
290 | return 0; |
291 | } | |
1da177e4 | 292 | |
443fc820 RW |
293 | static int acpi_scan_device_not_present(struct acpi_device *adev) |
294 | { | |
295 | if (!acpi_device_enumerated(adev)) { | |
296 | dev_warn(&adev->dev, "Still not present\n"); | |
297 | return -EALREADY; | |
298 | } | |
299 | acpi_bus_trim(adev); | |
300 | return 0; | |
301 | } | |
302 | ||
c27b2c33 | 303 | static int acpi_scan_device_check(struct acpi_device *adev) |
a33ec399 | 304 | { |
f943db40 | 305 | int error; |
a33ec399 | 306 | |
443fc820 RW |
307 | acpi_bus_get_status(adev); |
308 | if (adev->status.present || adev->status.functional) { | |
309 | /* | |
310 | * This function is only called for device objects for which | |
311 | * matching scan handlers exist. The only situation in which | |
312 | * the scan handler is not attached to this device object yet | |
313 | * is when the device has just appeared (either it wasn't | |
314 | * present at all before or it was removed and then added | |
315 | * again). | |
316 | */ | |
317 | if (adev->handler) { | |
318 | dev_warn(&adev->dev, "Already enumerated\n"); | |
319 | return -EALREADY; | |
320 | } | |
321 | error = acpi_bus_scan(adev->handle); | |
322 | if (error) { | |
323 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
324 | return error; | |
325 | } | |
326 | if (!adev->handler) { | |
327 | dev_warn(&adev->dev, "Enumeration failure\n"); | |
328 | error = -ENODEV; | |
329 | } | |
330 | } else { | |
331 | error = acpi_scan_device_not_present(adev); | |
332 | } | |
333 | return error; | |
334 | } | |
335 | ||
a976a2ac | 336 | static int acpi_scan_bus_check(struct acpi_device *adev, void *not_used) |
443fc820 RW |
337 | { |
338 | struct acpi_scan_handler *handler = adev->handler; | |
443fc820 RW |
339 | int error; |
340 | ||
341 | acpi_bus_get_status(adev); | |
342 | if (!(adev->status.present || adev->status.functional)) { | |
343 | acpi_scan_device_not_present(adev); | |
344 | return 0; | |
345 | } | |
346 | if (handler && handler->hotplug.scan_dependent) | |
347 | return handler->hotplug.scan_dependent(adev); | |
348 | ||
c27b2c33 RW |
349 | error = acpi_bus_scan(adev->handle); |
350 | if (error) { | |
351 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
352 | return error; | |
353 | } | |
a976a2ac | 354 | return acpi_dev_for_each_child(adev, acpi_scan_bus_check, NULL); |
a33ec399 RW |
355 | } |
356 | ||
3c2cc7ff RW |
357 | static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type) |
358 | { | |
359 | switch (type) { | |
360 | case ACPI_NOTIFY_BUS_CHECK: | |
a976a2ac | 361 | return acpi_scan_bus_check(adev, NULL); |
3c2cc7ff RW |
362 | case ACPI_NOTIFY_DEVICE_CHECK: |
363 | return acpi_scan_device_check(adev); | |
364 | case ACPI_NOTIFY_EJECT_REQUEST: | |
365 | case ACPI_OST_EC_OSPM_EJECT: | |
dd2151be RW |
366 | if (adev->handler && !adev->handler->hotplug.enabled) { |
367 | dev_info(&adev->dev, "Eject disabled\n"); | |
368 | return -EPERM; | |
369 | } | |
700b8422 RW |
370 | acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST, |
371 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); | |
3c2cc7ff RW |
372 | return acpi_scan_hot_remove(adev); |
373 | } | |
374 | return -EINVAL; | |
375 | } | |
376 | ||
1e3bcb59 | 377 | void acpi_device_hotplug(struct acpi_device *adev, u32 src) |
a33ec399 | 378 | { |
a33ec399 | 379 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
3c2cc7ff | 380 | int error = -ENODEV; |
a33ec399 | 381 | |
683058e3 | 382 | lock_device_hotplug(); |
e0ae8fee | 383 | mutex_lock(&acpi_scan_lock); |
a33ec399 | 384 | |
c27b2c33 RW |
385 | /* |
386 | * The device object's ACPI handle cannot become invalid as long as we | |
3c2cc7ff | 387 | * are holding acpi_scan_lock, but it might have become invalid before |
c27b2c33 RW |
388 | * that lock was acquired. |
389 | */ | |
390 | if (adev->handle == INVALID_ACPI_HANDLE) | |
3c2cc7ff | 391 | goto err_out; |
c27b2c33 | 392 | |
1e2380cd RW |
393 | if (adev->flags.is_dock_station) { |
394 | error = dock_notify(adev, src); | |
395 | } else if (adev->flags.hotplug_notify) { | |
3c2cc7ff RW |
396 | error = acpi_generic_hotplug_event(adev, src); |
397 | } else { | |
be27b3dc | 398 | int (*notify)(struct acpi_device *, u32); |
3c2cc7ff RW |
399 | |
400 | acpi_lock_hp_context(); | |
be27b3dc | 401 | notify = adev->hp ? adev->hp->notify : NULL; |
3c2cc7ff RW |
402 | acpi_unlock_hp_context(); |
403 | /* | |
404 | * There may be additional notify handlers for device objects | |
405 | * without the .event() callback, so ignore them here. | |
406 | */ | |
be27b3dc RW |
407 | if (notify) |
408 | error = notify(adev, src); | |
3c2cc7ff RW |
409 | else |
410 | goto out; | |
a33ec399 | 411 | } |
d429e5c1 LCY |
412 | switch (error) { |
413 | case 0: | |
c27b2c33 | 414 | ost_code = ACPI_OST_SC_SUCCESS; |
d429e5c1 LCY |
415 | break; |
416 | case -EPERM: | |
417 | ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; | |
418 | break; | |
419 | case -EBUSY: | |
420 | ost_code = ACPI_OST_SC_DEVICE_BUSY; | |
421 | break; | |
422 | default: | |
423 | ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; | |
424 | break; | |
425 | } | |
a33ec399 | 426 | |
3c2cc7ff | 427 | err_out: |
700b8422 | 428 | acpi_evaluate_ost(adev->handle, src, ost_code, NULL); |
3c2cc7ff RW |
429 | |
430 | out: | |
45e9aa1f | 431 | acpi_put_acpi_dev(adev); |
a33ec399 | 432 | mutex_unlock(&acpi_scan_lock); |
e0ae8fee | 433 | unlock_device_hotplug(); |
a33ec399 RW |
434 | } |
435 | ||
0b224527 RW |
436 | static void acpi_free_power_resources_lists(struct acpi_device *device) |
437 | { | |
438 | int i; | |
439 | ||
993cbe59 RW |
440 | if (device->wakeup.flags.valid) |
441 | acpi_power_resources_list_free(&device->wakeup.resources); | |
442 | ||
1b1f3e16 | 443 | if (!device->power.flags.power_resources) |
0b224527 RW |
444 | return; |
445 | ||
446 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { | |
447 | struct acpi_device_power_state *ps = &device->power.states[i]; | |
448 | acpi_power_resources_list_free(&ps->resources); | |
449 | } | |
7f47fa6c BH |
450 | } |
451 | ||
1890a97a | 452 | static void acpi_device_release(struct device *dev) |
1da177e4 | 453 | { |
1890a97a | 454 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1da177e4 | 455 | |
ffdcd955 | 456 | acpi_free_properties(acpi_dev); |
c0af4175 | 457 | acpi_free_pnp_ids(&acpi_dev->pnp); |
0b224527 | 458 | acpi_free_power_resources_lists(acpi_dev); |
1890a97a | 459 | kfree(acpi_dev); |
1da177e4 LT |
460 | } |
461 | ||
d783156e RW |
462 | static void acpi_device_del(struct acpi_device *device) |
463 | { | |
ca9dc8d4 LW |
464 | struct acpi_device_bus_id *acpi_device_bus_id; |
465 | ||
d783156e | 466 | mutex_lock(&acpi_device_lock); |
d783156e | 467 | |
ca9dc8d4 LW |
468 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) |
469 | if (!strcmp(acpi_device_bus_id->bus_id, | |
470 | acpi_device_hid(device))) { | |
ad2f3b08 RW |
471 | ida_free(&acpi_device_bus_id->instance_ida, |
472 | device->pnp.instance_no); | |
eb50aaf9 | 473 | if (ida_is_empty(&acpi_device_bus_id->instance_ida)) { |
ca9dc8d4 | 474 | list_del(&acpi_device_bus_id->node); |
a58015d6 | 475 | kfree_const(acpi_device_bus_id->bus_id); |
ca9dc8d4 LW |
476 | kfree(acpi_device_bus_id); |
477 | } | |
478 | break; | |
479 | } | |
480 | ||
d783156e | 481 | list_del(&device->wakeup_list); |
e6bdbcc7 | 482 | |
d783156e RW |
483 | mutex_unlock(&acpi_device_lock); |
484 | ||
485 | acpi_power_add_remove_device(device, false); | |
486 | acpi_device_remove_files(device); | |
487 | if (device->remove) | |
488 | device->remove(device); | |
489 | ||
490 | device_del(&device->dev); | |
491 | } | |
492 | ||
68bdb677 OP |
493 | static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain); |
494 | ||
d783156e RW |
495 | static LIST_HEAD(acpi_device_del_list); |
496 | static DEFINE_MUTEX(acpi_device_del_lock); | |
497 | ||
498 | static void acpi_device_del_work_fn(struct work_struct *work_not_used) | |
499 | { | |
500 | for (;;) { | |
501 | struct acpi_device *adev; | |
502 | ||
503 | mutex_lock(&acpi_device_del_lock); | |
504 | ||
505 | if (list_empty(&acpi_device_del_list)) { | |
506 | mutex_unlock(&acpi_device_del_lock); | |
507 | break; | |
508 | } | |
509 | adev = list_first_entry(&acpi_device_del_list, | |
510 | struct acpi_device, del_list); | |
511 | list_del(&adev->del_list); | |
512 | ||
513 | mutex_unlock(&acpi_device_del_lock); | |
514 | ||
68bdb677 OP |
515 | blocking_notifier_call_chain(&acpi_reconfig_chain, |
516 | ACPI_RECONFIG_DEVICE_REMOVE, adev); | |
517 | ||
d783156e RW |
518 | acpi_device_del(adev); |
519 | /* | |
520 | * Drop references to all power resources that might have been | |
521 | * used by the device. | |
522 | */ | |
523 | acpi_power_transition(adev, ACPI_STATE_D3_COLD); | |
4cbaba4e | 524 | acpi_dev_put(adev); |
d783156e RW |
525 | } |
526 | } | |
527 | ||
528 | /** | |
529 | * acpi_scan_drop_device - Drop an ACPI device object. | |
530 | * @handle: Handle of an ACPI namespace node, not used. | |
531 | * @context: Address of the ACPI device object to drop. | |
532 | * | |
533 | * This is invoked by acpi_ns_delete_node() during the removal of the ACPI | |
534 | * namespace node the device object pointed to by @context is attached to. | |
535 | * | |
536 | * The unregistration is carried out asynchronously to avoid running | |
537 | * acpi_device_del() under the ACPICA's namespace mutex and the list is used to | |
538 | * ensure the correct ordering (the device objects must be unregistered in the | |
539 | * same order in which the corresponding namespace nodes are deleted). | |
540 | */ | |
541 | static void acpi_scan_drop_device(acpi_handle handle, void *context) | |
caf5c03f | 542 | { |
d783156e RW |
543 | static DECLARE_WORK(work, acpi_device_del_work_fn); |
544 | struct acpi_device *adev = context; | |
545 | ||
546 | mutex_lock(&acpi_device_del_lock); | |
547 | ||
548 | /* | |
549 | * Use the ACPI hotplug workqueue which is ordered, so this work item | |
550 | * won't run after any hotplug work items submitted subsequently. That | |
551 | * prevents attempts to register device objects identical to those being | |
552 | * deleted from happening concurrently (such attempts result from | |
553 | * hotplug events handled via the ACPI hotplug workqueue). It also will | |
935ab850 | 554 | * run after all of the work items submitted previously, which helps |
d783156e RW |
555 | * those work items to ensure that they are not accessing stale device |
556 | * objects. | |
557 | */ | |
558 | if (list_empty(&acpi_device_del_list)) | |
559 | acpi_queue_hotplug_work(&work); | |
560 | ||
561 | list_add_tail(&adev->del_list, &acpi_device_del_list); | |
562 | /* Make acpi_ns_validate_handle() return NULL for this handle. */ | |
563 | adev->handle = INVALID_ACPI_HANDLE; | |
564 | ||
565 | mutex_unlock(&acpi_device_del_lock); | |
caf5c03f RW |
566 | } |
567 | ||
83e2c8fc RW |
568 | static struct acpi_device *handle_to_device(acpi_handle handle, |
569 | void (*callback)(void *)) | |
caf5c03f | 570 | { |
83e2c8fc | 571 | struct acpi_device *adev = NULL; |
caf5c03f RW |
572 | acpi_status status; |
573 | ||
78ea4639 | 574 | status = acpi_get_data_full(handle, acpi_scan_drop_device, |
83e2c8fc RW |
575 | (void **)&adev, callback); |
576 | if (ACPI_FAILURE(status) || !adev) { | |
577 | acpi_handle_debug(handle, "No context!\n"); | |
578 | return NULL; | |
caf5c03f | 579 | } |
83e2c8fc | 580 | return adev; |
caf5c03f | 581 | } |
78ea4639 | 582 | |
e3c963c4 RW |
583 | /** |
584 | * acpi_fetch_acpi_dev - Retrieve ACPI device object. | |
585 | * @handle: ACPI handle associated with the requested ACPI device object. | |
586 | * | |
587 | * Return a pointer to the ACPI device object associated with @handle, if | |
588 | * present, or NULL otherwise. | |
589 | */ | |
590 | struct acpi_device *acpi_fetch_acpi_dev(acpi_handle handle) | |
591 | { | |
592 | return handle_to_device(handle, NULL); | |
593 | } | |
594 | EXPORT_SYMBOL_GPL(acpi_fetch_acpi_dev); | |
595 | ||
78ea4639 RW |
596 | static void get_acpi_device(void *dev) |
597 | { | |
4cbaba4e | 598 | acpi_dev_get(dev); |
78ea4639 RW |
599 | } |
600 | ||
45e9aa1f RW |
601 | /** |
602 | * acpi_get_acpi_dev - Retrieve ACPI device object and reference count it. | |
603 | * @handle: ACPI handle associated with the requested ACPI device object. | |
604 | * | |
605 | * Return a pointer to the ACPI device object associated with @handle and bump | |
606 | * up that object's reference counter (under the ACPI Namespace lock), if | |
607 | * present, or return NULL otherwise. | |
608 | * | |
609 | * The ACPI device object reference acquired by this function needs to be | |
610 | * dropped via acpi_dev_put(). | |
611 | */ | |
612 | struct acpi_device *acpi_get_acpi_dev(acpi_handle handle) | |
78ea4639 | 613 | { |
83e2c8fc | 614 | return handle_to_device(handle, get_acpi_device); |
78ea4639 | 615 | } |
45e9aa1f | 616 | EXPORT_SYMBOL_GPL(acpi_get_acpi_dev); |
78ea4639 | 617 | |
c1013ff7 RW |
618 | static struct acpi_device_bus_id *acpi_device_bus_id_match(const char *dev_id) |
619 | { | |
620 | struct acpi_device_bus_id *acpi_device_bus_id; | |
621 | ||
622 | /* Find suitable bus_id and instance number in acpi_bus_id_list. */ | |
623 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { | |
624 | if (!strcmp(acpi_device_bus_id->bus_id, dev_id)) | |
625 | return acpi_device_bus_id; | |
626 | } | |
627 | return NULL; | |
628 | } | |
629 | ||
eb50aaf9 AS |
630 | static int acpi_device_set_name(struct acpi_device *device, |
631 | struct acpi_device_bus_id *acpi_device_bus_id) | |
632 | { | |
633 | struct ida *instance_ida = &acpi_device_bus_id->instance_ida; | |
634 | int result; | |
635 | ||
ad2f3b08 | 636 | result = ida_alloc(instance_ida, GFP_KERNEL); |
eb50aaf9 AS |
637 | if (result < 0) |
638 | return result; | |
639 | ||
640 | device->pnp.instance_no = result; | |
641 | dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, result); | |
642 | return 0; | |
643 | } | |
644 | ||
6e1850b2 | 645 | int acpi_tie_acpi_dev(struct acpi_device *adev) |
1da177e4 | 646 | { |
c6a493a1 RW |
647 | acpi_handle handle = adev->handle; |
648 | acpi_status status; | |
66b7ed40 | 649 | |
c6a493a1 RW |
650 | if (!handle) |
651 | return 0; | |
d43e167d | 652 | |
c6a493a1 RW |
653 | status = acpi_attach_data(handle, acpi_scan_drop_device, adev); |
654 | if (ACPI_FAILURE(status)) { | |
655 | acpi_handle_err(handle, "Unable to attach device data\n"); | |
656 | return -ENODEV; | |
d43e167d RW |
657 | } |
658 | ||
c6a493a1 RW |
659 | return 0; |
660 | } | |
661 | ||
882c982d HK |
662 | static void acpi_store_pld_crc(struct acpi_device *adev) |
663 | { | |
664 | struct acpi_pld_info *pld; | |
665 | acpi_status status; | |
666 | ||
667 | status = acpi_get_physical_device_location(adev->handle, &pld); | |
668 | if (ACPI_FAILURE(status)) | |
669 | return; | |
670 | ||
671 | adev->pld_crc = crc32(~0, pld, sizeof(*pld)); | |
672 | ACPI_FREE(pld); | |
673 | } | |
674 | ||
6e1850b2 | 675 | int acpi_device_add(struct acpi_device *device) |
1da177e4 | 676 | { |
c1013ff7 | 677 | struct acpi_device_bus_id *acpi_device_bus_id; |
4be44fcd | 678 | int result; |
66b7ed40 | 679 | |
9e89dde2 ZR |
680 | /* |
681 | * Linkage | |
682 | * ------- | |
683 | * Link this device to its parent and siblings. | |
684 | */ | |
9e89dde2 | 685 | INIT_LIST_HEAD(&device->wakeup_list); |
1033f904 | 686 | INIT_LIST_HEAD(&device->physical_node_list); |
d783156e | 687 | INIT_LIST_HEAD(&device->del_list); |
1033f904 | 688 | mutex_init(&device->physical_node_lock); |
1da177e4 | 689 | |
9090589d | 690 | mutex_lock(&acpi_device_lock); |
c1013ff7 RW |
691 | |
692 | acpi_device_bus_id = acpi_device_bus_id_match(acpi_device_hid(device)); | |
693 | if (acpi_device_bus_id) { | |
eb50aaf9 AS |
694 | result = acpi_device_set_name(device, acpi_device_bus_id); |
695 | if (result) | |
696 | goto err_unlock; | |
c1013ff7 RW |
697 | } else { |
698 | acpi_device_bus_id = kzalloc(sizeof(*acpi_device_bus_id), | |
699 | GFP_KERNEL); | |
700 | if (!acpi_device_bus_id) { | |
701 | result = -ENOMEM; | |
702 | goto err_unlock; | |
e49bd2dd | 703 | } |
a58015d6 DC |
704 | acpi_device_bus_id->bus_id = |
705 | kstrdup_const(acpi_device_hid(device), GFP_KERNEL); | |
706 | if (!acpi_device_bus_id->bus_id) { | |
c1013ff7 | 707 | kfree(acpi_device_bus_id); |
a58015d6 | 708 | result = -ENOMEM; |
c1013ff7 | 709 | goto err_unlock; |
a58015d6 DC |
710 | } |
711 | ||
eb50aaf9 AS |
712 | ida_init(&acpi_device_bus_id->instance_ida); |
713 | ||
714 | result = acpi_device_set_name(device, acpi_device_bus_id); | |
715 | if (result) { | |
0c8bd174 | 716 | kfree_const(acpi_device_bus_id->bus_id); |
eb50aaf9 AS |
717 | kfree(acpi_device_bus_id); |
718 | goto err_unlock; | |
719 | } | |
720 | ||
e49bd2dd | 721 | list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); |
1da177e4 LT |
722 | } |
723 | ||
9e89dde2 ZR |
724 | if (device->wakeup.flags.valid) |
725 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); | |
5e73c518 | 726 | |
882c982d HK |
727 | acpi_store_pld_crc(device); |
728 | ||
9090589d | 729 | mutex_unlock(&acpi_device_lock); |
1da177e4 | 730 | |
cf860be6 | 731 | result = device_add(&device->dev); |
0c526d96 | 732 | if (result) { |
8b12b922 | 733 | dev_err(&device->dev, "Error registering device\n"); |
d43e167d | 734 | goto err; |
1da177e4 | 735 | } |
1da177e4 | 736 | |
e49bd2dd | 737 | result = acpi_device_setup_files(device); |
0c526d96 | 738 | if (result) |
8acf4108 | 739 | pr_err("Error creating sysfs interface for device %s\n", |
0794469d | 740 | dev_name(&device->dev)); |
1da177e4 | 741 | |
1da177e4 | 742 | return 0; |
d43e167d | 743 | |
5e73c518 | 744 | err: |
9090589d | 745 | mutex_lock(&acpi_device_lock); |
5e73c518 | 746 | |
e49bd2dd | 747 | list_del(&device->wakeup_list); |
a58015d6 | 748 | |
5e73c518 | 749 | err_unlock: |
9090589d | 750 | mutex_unlock(&acpi_device_lock); |
d43e167d | 751 | |
d783156e | 752 | acpi_detach_data(device->handle, acpi_scan_drop_device); |
5e73c518 | 753 | |
e49bd2dd | 754 | return result; |
1da177e4 LT |
755 | } |
756 | ||
9e89dde2 ZR |
757 | /* -------------------------------------------------------------------------- |
758 | Device Enumeration | |
759 | -------------------------------------------------------------------------- */ | |
2ef33ee7 RW |
760 | static bool acpi_info_matches_ids(struct acpi_device_info *info, |
761 | const char * const ids[]) | |
637b9f1a | 762 | { |
2ef33ee7 | 763 | struct acpi_pnp_device_id_list *cid_list = NULL; |
02050558 | 764 | int i, index; |
637b9f1a HG |
765 | |
766 | if (!(info->valid & ACPI_VALID_HID)) | |
767 | return false; | |
768 | ||
02050558 AS |
769 | index = match_string(ids, -1, info->hardware_id.string); |
770 | if (index >= 0) | |
771 | return true; | |
772 | ||
2ef33ee7 RW |
773 | if (info->valid & ACPI_VALID_CID) |
774 | cid_list = &info->compatible_id_list; | |
775 | ||
02050558 AS |
776 | if (!cid_list) |
777 | return false; | |
2ef33ee7 | 778 | |
02050558 AS |
779 | for (i = 0; i < cid_list->count; i++) { |
780 | index = match_string(ids, -1, cid_list->ids[i].string); | |
781 | if (index >= 0) | |
637b9f1a HG |
782 | return true; |
783 | } | |
784 | ||
785 | return false; | |
786 | } | |
787 | ||
788 | /* List of HIDs for which we ignore matching ACPI devices, when checking _DEP lists. */ | |
2ef33ee7 | 789 | static const char * const acpi_ignore_dep_ids[] = { |
2ef33ee7 | 790 | "PNP0D80", /* Windows-compatible System Power Management Controller */ |
9272e97a | 791 | "INT33BD", /* Intel Baytrail Mailbox Device */ |
fa153b7c | 792 | "LATT2021", /* Lattice FW Update Client Driver */ |
637b9f1a HG |
793 | NULL |
794 | }; | |
795 | ||
9d9bcae4 HG |
796 | /* List of HIDs for which we honor deps of matching ACPI devs, when checking _DEP lists. */ |
797 | static const char * const acpi_honor_dep_ids[] = { | |
798 | "INT3472", /* Camera sensor PMIC / clk and regulator info */ | |
799 | NULL | |
800 | }; | |
801 | ||
f6f1e12f | 802 | static struct acpi_device *acpi_find_parent_acpi_dev(acpi_handle handle) |
5c478f49 | 803 | { |
f6f1e12f | 804 | struct acpi_device *adev; |
5c478f49 BH |
805 | |
806 | /* | |
807 | * Fixed hardware devices do not appear in the namespace and do not | |
808 | * have handles, but we fabricate acpi_devices for them, so we have | |
809 | * to deal with them specially. | |
810 | */ | |
456de893 | 811 | if (!handle) |
5c478f49 BH |
812 | return acpi_root; |
813 | ||
814 | do { | |
f6f1e12f RW |
815 | acpi_status status; |
816 | ||
5c478f49 | 817 | status = acpi_get_parent(handle, &handle); |
f6f1e12f RW |
818 | if (ACPI_FAILURE(status)) { |
819 | if (status != AE_NULL_ENTRY) | |
820 | return acpi_root; | |
e3c963c4 | 821 | |
f6f1e12f RW |
822 | return NULL; |
823 | } | |
824 | adev = acpi_fetch_acpi_dev(handle); | |
825 | } while (!adev); | |
826 | return adev; | |
5c478f49 BH |
827 | } |
828 | ||
9e89dde2 ZR |
829 | acpi_status |
830 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) | |
831 | { | |
832 | acpi_status status; | |
833 | acpi_handle tmp; | |
834 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
835 | union acpi_object *obj; | |
836 | ||
837 | status = acpi_get_handle(handle, "_EJD", &tmp); | |
838 | if (ACPI_FAILURE(status)) | |
839 | return status; | |
840 | ||
841 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); | |
842 | if (ACPI_SUCCESS(status)) { | |
843 | obj = buffer.pointer; | |
3b5fee59 HM |
844 | status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, |
845 | ejd); | |
9e89dde2 ZR |
846 | kfree(buffer.pointer); |
847 | } | |
848 | return status; | |
849 | } | |
850 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); | |
851 | ||
40381a3c | 852 | static int acpi_bus_extract_wakeup_device_power_package(struct acpi_device *dev) |
9e89dde2 | 853 | { |
40381a3c BH |
854 | acpi_handle handle = dev->handle; |
855 | struct acpi_device_wakeup *wakeup = &dev->wakeup; | |
b581a7f9 RW |
856 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
857 | union acpi_object *package = NULL; | |
9e89dde2 | 858 | union acpi_object *element = NULL; |
b581a7f9 | 859 | acpi_status status; |
e88c9c60 | 860 | int err = -ENODATA; |
9e89dde2 | 861 | |
993cbe59 | 862 | INIT_LIST_HEAD(&wakeup->resources); |
9e89dde2 | 863 | |
b581a7f9 RW |
864 | /* _PRW */ |
865 | status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); | |
866 | if (ACPI_FAILURE(status)) { | |
e52d9d8c RW |
867 | acpi_handle_info(handle, "_PRW evaluation failed: %s\n", |
868 | acpi_format_exception(status)); | |
e88c9c60 | 869 | return err; |
b581a7f9 RW |
870 | } |
871 | ||
872 | package = (union acpi_object *)buffer.pointer; | |
873 | ||
e88c9c60 | 874 | if (!package || package->package.count < 2) |
b581a7f9 | 875 | goto out; |
b581a7f9 | 876 | |
9e89dde2 | 877 | element = &(package->package.elements[0]); |
e88c9c60 | 878 | if (!element) |
b581a7f9 | 879 | goto out; |
e88c9c60 | 880 | |
9e89dde2 ZR |
881 | if (element->type == ACPI_TYPE_PACKAGE) { |
882 | if ((element->package.count < 2) || | |
883 | (element->package.elements[0].type != | |
884 | ACPI_TYPE_LOCAL_REFERENCE) | |
e88c9c60 | 885 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
b581a7f9 | 886 | goto out; |
e88c9c60 | 887 | |
b581a7f9 | 888 | wakeup->gpe_device = |
9e89dde2 | 889 | element->package.elements[0].reference.handle; |
b581a7f9 | 890 | wakeup->gpe_number = |
9e89dde2 ZR |
891 | (u32) element->package.elements[1].integer.value; |
892 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
b581a7f9 RW |
893 | wakeup->gpe_device = NULL; |
894 | wakeup->gpe_number = element->integer.value; | |
895 | } else { | |
b581a7f9 RW |
896 | goto out; |
897 | } | |
9e89dde2 ZR |
898 | |
899 | element = &(package->package.elements[1]); | |
e88c9c60 | 900 | if (element->type != ACPI_TYPE_INTEGER) |
b581a7f9 | 901 | goto out; |
e88c9c60 | 902 | |
b581a7f9 | 903 | wakeup->sleep_state = element->integer.value; |
9e89dde2 | 904 | |
e88c9c60 RW |
905 | err = acpi_extract_power_resources(package, 2, &wakeup->resources); |
906 | if (err) | |
b581a7f9 | 907 | goto out; |
9e89dde2 | 908 | |
0596a52b RW |
909 | if (!list_empty(&wakeup->resources)) { |
910 | int sleep_state; | |
9e89dde2 | 911 | |
b5d667eb RW |
912 | err = acpi_power_wakeup_list_init(&wakeup->resources, |
913 | &sleep_state); | |
914 | if (err) { | |
915 | acpi_handle_warn(handle, "Retrieving current states " | |
916 | "of wakeup power resources failed\n"); | |
917 | acpi_power_resources_list_free(&wakeup->resources); | |
918 | goto out; | |
919 | } | |
0596a52b RW |
920 | if (sleep_state < wakeup->sleep_state) { |
921 | acpi_handle_warn(handle, "Overriding _PRW sleep state " | |
922 | "(S%d) by S%d from power resources\n", | |
923 | (int)wakeup->sleep_state, sleep_state); | |
924 | wakeup->sleep_state = sleep_state; | |
925 | } | |
926 | } | |
9874647b | 927 | |
b581a7f9 RW |
928 | out: |
929 | kfree(buffer.pointer); | |
e88c9c60 | 930 | return err; |
1da177e4 LT |
931 | } |
932 | ||
a1a66393 | 933 | static bool acpi_wakeup_gpe_init(struct acpi_device *device) |
1da177e4 | 934 | { |
0519ade7 | 935 | static const struct acpi_device_id button_device_ids[] = { |
5ceb5f05 BH |
936 | {"PNP0C0C", 0}, /* Power button */ |
937 | {"PNP0C0D", 0}, /* Lid */ | |
938 | {"PNP0C0E", 0}, /* Sleep button */ | |
29b71a1c TR |
939 | {"", 0}, |
940 | }; | |
bd9b2f9a | 941 | struct acpi_device_wakeup *wakeup = &device->wakeup; |
f517709d | 942 | acpi_status status; |
f517709d | 943 | |
bd9b2f9a | 944 | wakeup->flags.notifier_present = 0; |
f517709d RW |
945 | |
946 | /* Power button, Lid switch always enable wakeup */ | |
947 | if (!acpi_match_device_ids(device, button_device_ids)) { | |
b7e38304 ZR |
948 | if (!acpi_match_device_ids(device, &button_device_ids[1])) { |
949 | /* Do not use Lid/sleep button for S5 wakeup */ | |
bd9b2f9a RW |
950 | if (wakeup->sleep_state == ACPI_STATE_S5) |
951 | wakeup->sleep_state = ACPI_STATE_S4; | |
b7e38304 | 952 | } |
bd9b2f9a | 953 | acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number); |
f2b56bc8 | 954 | device_set_wakeup_capable(&device->dev, true); |
a1a66393 | 955 | return true; |
f517709d RW |
956 | } |
957 | ||
a1a66393 RW |
958 | status = acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device, |
959 | wakeup->gpe_number); | |
960 | return ACPI_SUCCESS(status); | |
f517709d RW |
961 | } |
962 | ||
d57d09a4 | 963 | static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
f517709d | 964 | { |
e88c9c60 | 965 | int err; |
29b71a1c | 966 | |
d57d09a4 | 967 | /* Presence of _PRW indicates wake capable */ |
952c63e9 | 968 | if (!acpi_has_method(device->handle, "_PRW")) |
d57d09a4 RW |
969 | return; |
970 | ||
40381a3c | 971 | err = acpi_bus_extract_wakeup_device_power_package(device); |
e88c9c60 | 972 | if (err) { |
e52d9d8c | 973 | dev_err(&device->dev, "Unable to extract wakeup power resources"); |
d57d09a4 | 974 | return; |
9e89dde2 | 975 | } |
1da177e4 | 976 | |
a1a66393 | 977 | device->wakeup.flags.valid = acpi_wakeup_gpe_init(device); |
9b83ccd2 | 978 | device->wakeup.prepare_count = 0; |
a1a66393 RW |
979 | /* |
980 | * Call _PSW/_DSW object to disable its ability to wake the sleeping | |
729b2bdb | 981 | * system for the ACPI device with the _PRW object. |
603fadf3 | 982 | * The _PSW object is deprecated in ACPI 3.0 and is replaced by _DSW. |
729b2bdb ZY |
983 | * So it is necessary to call _DSW object first. Only when it is not |
984 | * present will the _PSW object used. | |
985 | */ | |
e88c9c60 RW |
986 | err = acpi_device_sleep_wake(device, 0, 0, 0); |
987 | if (err) | |
05de0686 | 988 | pr_debug("error in _DSW or _PSW evaluation\n"); |
1da177e4 | 989 | } |
1da177e4 | 990 | |
f33ce568 RW |
991 | static void acpi_bus_init_power_state(struct acpi_device *device, int state) |
992 | { | |
993 | struct acpi_device_power_state *ps = &device->power.states[state]; | |
ef85bdbe RW |
994 | char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; |
995 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
f33ce568 | 996 | acpi_status status; |
bf325f95 | 997 | |
f33ce568 RW |
998 | INIT_LIST_HEAD(&ps->resources); |
999 | ||
ef85bdbe RW |
1000 | /* Evaluate "_PRx" to get referenced power resources */ |
1001 | status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); | |
1002 | if (ACPI_SUCCESS(status)) { | |
1003 | union acpi_object *package = buffer.pointer; | |
1004 | ||
1005 | if (buffer.length && package | |
1006 | && package->type == ACPI_TYPE_PACKAGE | |
956ad9d9 RW |
1007 | && package->package.count) |
1008 | acpi_extract_power_resources(package, 0, &ps->resources); | |
1009 | ||
ef85bdbe | 1010 | ACPI_FREE(buffer.pointer); |
f33ce568 RW |
1011 | } |
1012 | ||
1013 | /* Evaluate "_PSx" to see if we can do explicit sets */ | |
ef85bdbe | 1014 | pathname[2] = 'S'; |
952c63e9 | 1015 | if (acpi_has_method(device->handle, pathname)) |
f33ce568 RW |
1016 | ps->flags.explicit_set = 1; |
1017 | ||
20dacb71 RW |
1018 | /* State is valid if there are means to put the device into it. */ |
1019 | if (!list_empty(&ps->resources) || ps->flags.explicit_set) | |
f33ce568 | 1020 | ps->flags.valid = 1; |
f33ce568 RW |
1021 | |
1022 | ps->power = -1; /* Unknown - driver assigned */ | |
1023 | ps->latency = -1; /* Unknown - driver assigned */ | |
1024 | } | |
1025 | ||
d43e167d | 1026 | static void acpi_bus_get_power_flags(struct acpi_device *device) |
1da177e4 | 1027 | { |
b340c7d6 | 1028 | unsigned long long dsc = ACPI_STATE_D0; |
8bc5053b | 1029 | u32 i; |
1a365616 | 1030 | |
d43e167d | 1031 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ |
952c63e9 JL |
1032 | if (!acpi_has_method(device->handle, "_PS0") && |
1033 | !acpi_has_method(device->handle, "_PR0")) | |
1034 | return; | |
1a365616 | 1035 | |
d43e167d | 1036 | device->flags.power_manageable = 1; |
4be44fcd | 1037 | |
9e89dde2 ZR |
1038 | /* |
1039 | * Power Management Flags | |
1040 | */ | |
952c63e9 | 1041 | if (acpi_has_method(device->handle, "_PSC")) |
9e89dde2 | 1042 | device->power.flags.explicit_get = 1; |
f25c0ae2 | 1043 | |
952c63e9 | 1044 | if (acpi_has_method(device->handle, "_IRC")) |
9e89dde2 | 1045 | device->power.flags.inrush_current = 1; |
1da177e4 | 1046 | |
f25c0ae2 RW |
1047 | if (acpi_has_method(device->handle, "_DSW")) |
1048 | device->power.flags.dsw_present = 1; | |
1049 | ||
b340c7d6 SA |
1050 | acpi_evaluate_integer(device->handle, "_DSC", NULL, &dsc); |
1051 | device->power.state_for_enumeration = dsc; | |
1052 | ||
9e89dde2 ZR |
1053 | /* |
1054 | * Enumerate supported power management states | |
1055 | */ | |
f33ce568 RW |
1056 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) |
1057 | acpi_bus_init_power_state(device, i); | |
bf325f95 | 1058 | |
0b224527 | 1059 | INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); |
1da177e4 | 1060 | |
956ad9d9 | 1061 | /* Set the defaults for D0 and D3hot (always supported). */ |
9e89dde2 ZR |
1062 | device->power.states[ACPI_STATE_D0].flags.valid = 1; |
1063 | device->power.states[ACPI_STATE_D0].power = 100; | |
20dacb71 | 1064 | device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1; |
1399dfcd | 1065 | |
956ad9d9 RW |
1066 | /* |
1067 | * Use power resources only if the D0 list of them is populated, because | |
1068 | * some platforms may provide _PR3 only to indicate D3cold support and | |
1069 | * in those cases the power resources list returned by it may be bogus. | |
1070 | */ | |
1071 | if (!list_empty(&device->power.states[ACPI_STATE_D0].resources)) { | |
1072 | device->power.flags.power_resources = 1; | |
1073 | /* | |
1074 | * D3cold is supported if the D3hot list of power resources is | |
1075 | * not empty. | |
1076 | */ | |
1077 | if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources)) | |
1078 | device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; | |
1079 | } | |
1080 | ||
1b1f3e16 | 1081 | if (acpi_bus_init_power(device)) |
b3785492 | 1082 | device->flags.power_manageable = 0; |
9e89dde2 | 1083 | } |
c8f7a62c | 1084 | |
d43e167d | 1085 | static void acpi_bus_get_flags(struct acpi_device *device) |
1da177e4 | 1086 | { |
1da177e4 | 1087 | /* Presence of _STA indicates 'dynamic_status' */ |
952c63e9 | 1088 | if (acpi_has_method(device->handle, "_STA")) |
1da177e4 LT |
1089 | device->flags.dynamic_status = 1; |
1090 | ||
1da177e4 | 1091 | /* Presence of _RMV indicates 'removable' */ |
952c63e9 | 1092 | if (acpi_has_method(device->handle, "_RMV")) |
1da177e4 LT |
1093 | device->flags.removable = 1; |
1094 | ||
1095 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ | |
952c63e9 JL |
1096 | if (acpi_has_method(device->handle, "_EJD") || |
1097 | acpi_has_method(device->handle, "_EJ0")) | |
1da177e4 | 1098 | device->flags.ejectable = 1; |
1da177e4 LT |
1099 | } |
1100 | ||
c7bcb4e9 | 1101 | static void acpi_device_get_busid(struct acpi_device *device) |
1da177e4 | 1102 | { |
4be44fcd LB |
1103 | char bus_id[5] = { '?', 0 }; |
1104 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; | |
1105 | int i = 0; | |
1da177e4 LT |
1106 | |
1107 | /* | |
1108 | * Bus ID | |
1109 | * ------ | |
1110 | * The device's Bus ID is simply the object name. | |
1111 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? | |
1112 | */ | |
62fcb99b | 1113 | if (!acpi_dev_parent(device)) { |
1da177e4 | 1114 | strcpy(device->pnp.bus_id, "ACPI"); |
859ac9a4 BH |
1115 | return; |
1116 | } | |
1117 | ||
1118 | switch (device->device_type) { | |
1da177e4 LT |
1119 | case ACPI_BUS_TYPE_POWER_BUTTON: |
1120 | strcpy(device->pnp.bus_id, "PWRF"); | |
1121 | break; | |
1122 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
1123 | strcpy(device->pnp.bus_id, "SLPF"); | |
1124 | break; | |
a64a62ce LZ |
1125 | case ACPI_BUS_TYPE_ECDT_EC: |
1126 | strcpy(device->pnp.bus_id, "ECDT"); | |
1127 | break; | |
1da177e4 | 1128 | default: |
66b7ed40 | 1129 | acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); |
1da177e4 LT |
1130 | /* Clean up trailing underscores (if any) */ |
1131 | for (i = 3; i > 1; i--) { | |
1132 | if (bus_id[i] == '_') | |
1133 | bus_id[i] = '\0'; | |
1134 | else | |
1135 | break; | |
1136 | } | |
1137 | strcpy(device->pnp.bus_id, bus_id); | |
1138 | break; | |
1139 | } | |
1140 | } | |
1141 | ||
ebf4df8d JL |
1142 | /* |
1143 | * acpi_ata_match - see if an acpi object is an ATA device | |
1144 | * | |
1145 | * If an acpi object has one of the ACPI ATA methods defined, | |
1146 | * then we can safely call it an ATA device. | |
1147 | */ | |
1148 | bool acpi_ata_match(acpi_handle handle) | |
1149 | { | |
1150 | return acpi_has_method(handle, "_GTF") || | |
1151 | acpi_has_method(handle, "_GTM") || | |
1152 | acpi_has_method(handle, "_STM") || | |
1153 | acpi_has_method(handle, "_SDD"); | |
1154 | } | |
1155 | ||
54735266 | 1156 | /* |
d4e1a692 | 1157 | * acpi_bay_match - see if an acpi object is an ejectable driver bay |
54735266 ZR |
1158 | * |
1159 | * If an acpi object is ejectable and has one of the ACPI ATA methods defined, | |
1160 | * then we can safely call it an ejectable drive bay | |
1161 | */ | |
ebf4df8d | 1162 | bool acpi_bay_match(acpi_handle handle) |
d4e1a692 | 1163 | { |
54735266 ZR |
1164 | acpi_handle phandle; |
1165 | ||
952c63e9 | 1166 | if (!acpi_has_method(handle, "_EJ0")) |
ebf4df8d JL |
1167 | return false; |
1168 | if (acpi_ata_match(handle)) | |
1169 | return true; | |
1170 | if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) | |
1171 | return false; | |
54735266 | 1172 | |
ebf4df8d | 1173 | return acpi_ata_match(phandle); |
54735266 ZR |
1174 | } |
1175 | ||
b43109fa | 1176 | bool acpi_device_is_battery(struct acpi_device *adev) |
1e2380cd | 1177 | { |
b43109fa | 1178 | struct acpi_hardware_id *hwid; |
1e2380cd | 1179 | |
b43109fa RW |
1180 | list_for_each_entry(hwid, &adev->pnp.ids, list) |
1181 | if (!strcmp("PNP0C0A", hwid->id)) | |
1182 | return true; | |
1e2380cd | 1183 | |
b43109fa | 1184 | return false; |
1e2380cd RW |
1185 | } |
1186 | ||
b43109fa | 1187 | static bool is_ejectable_bay(struct acpi_device *adev) |
1e2380cd | 1188 | { |
b43109fa RW |
1189 | acpi_handle handle = adev->handle; |
1190 | ||
1191 | if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev)) | |
1e2380cd RW |
1192 | return true; |
1193 | ||
1194 | return acpi_bay_match(handle); | |
1195 | } | |
1196 | ||
3620f2f2 | 1197 | /* |
d4e1a692 | 1198 | * acpi_dock_match - see if an acpi object has a _DCK method |
3620f2f2 | 1199 | */ |
ebf4df8d | 1200 | bool acpi_dock_match(acpi_handle handle) |
3620f2f2 | 1201 | { |
ebf4df8d | 1202 | return acpi_has_method(handle, "_DCK"); |
3620f2f2 FS |
1203 | } |
1204 | ||
adc8bb8e HG |
1205 | static acpi_status |
1206 | acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context, | |
1207 | void **return_value) | |
1208 | { | |
1209 | long *cap = context; | |
1210 | ||
1211 | if (acpi_has_method(handle, "_BCM") && | |
1212 | acpi_has_method(handle, "_BCL")) { | |
e52d9d8c | 1213 | acpi_handle_debug(handle, "Found generic backlight support\n"); |
adc8bb8e | 1214 | *cap |= ACPI_VIDEO_BACKLIGHT; |
adc8bb8e HG |
1215 | /* We have backlight support, no need to scan further */ |
1216 | return AE_CTRL_TERMINATE; | |
1217 | } | |
1218 | return 0; | |
1219 | } | |
1220 | ||
1221 | /* Returns true if the ACPI object is a video device which can be | |
1222 | * handled by video.ko. | |
1223 | * The device will get a Linux specific CID added in scan.c to | |
1224 | * identify the device as an ACPI graphics device | |
1225 | * Be aware that the graphics device may not be physically present | |
1226 | * Use acpi_video_get_capabilities() to detect general ACPI video | |
1227 | * capabilities of present cards | |
1228 | */ | |
1229 | long acpi_is_video_device(acpi_handle handle) | |
1230 | { | |
1231 | long video_caps = 0; | |
1232 | ||
1233 | /* Is this device able to support video switching ? */ | |
1234 | if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS")) | |
1235 | video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING; | |
1236 | ||
1237 | /* Is this device able to retrieve a video ROM ? */ | |
1238 | if (acpi_has_method(handle, "_ROM")) | |
1239 | video_caps |= ACPI_VIDEO_ROM_AVAILABLE; | |
1240 | ||
1241 | /* Is this device able to configure which video head to be POSTed ? */ | |
1242 | if (acpi_has_method(handle, "_VPO") && | |
1243 | acpi_has_method(handle, "_GPD") && | |
1244 | acpi_has_method(handle, "_SPD")) | |
1245 | video_caps |= ACPI_VIDEO_DEVICE_POSTING; | |
1246 | ||
1247 | /* Only check for backlight functionality if one of the above hit. */ | |
1248 | if (video_caps) | |
1249 | acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, | |
1250 | ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL, | |
1251 | &video_caps, NULL); | |
1252 | ||
1253 | return video_caps; | |
1254 | } | |
1255 | EXPORT_SYMBOL(acpi_is_video_device); | |
1256 | ||
620e112c | 1257 | const char *acpi_device_hid(struct acpi_device *device) |
15b8dd53 | 1258 | { |
7f47fa6c | 1259 | struct acpi_hardware_id *hid; |
15b8dd53 | 1260 | |
2b2ae7c7 TR |
1261 | if (list_empty(&device->pnp.ids)) |
1262 | return dummy_hid; | |
1263 | ||
7f47fa6c BH |
1264 | hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); |
1265 | return hid->id; | |
1266 | } | |
1267 | EXPORT_SYMBOL(acpi_device_hid); | |
15b8dd53 | 1268 | |
d4e1a692 | 1269 | static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) |
7f47fa6c BH |
1270 | { |
1271 | struct acpi_hardware_id *id; | |
15b8dd53 | 1272 | |
7f47fa6c BH |
1273 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
1274 | if (!id) | |
1275 | return; | |
15b8dd53 | 1276 | |
6a0d12ef | 1277 | id->id = kstrdup_const(dev_id, GFP_KERNEL); |
7f47fa6c BH |
1278 | if (!id->id) { |
1279 | kfree(id); | |
1280 | return; | |
15b8dd53 BM |
1281 | } |
1282 | ||
d4e1a692 TK |
1283 | list_add_tail(&id->list, &pnp->ids); |
1284 | pnp->type.hardware_id = 1; | |
15b8dd53 BM |
1285 | } |
1286 | ||
222e82ac DW |
1287 | /* |
1288 | * Old IBM workstations have a DSDT bug wherein the SMBus object | |
1289 | * lacks the SMBUS01 HID and the methods do not have the necessary "_" | |
1290 | * prefix. Work around this. | |
1291 | */ | |
ebf4df8d | 1292 | static bool acpi_ibm_smbus_match(acpi_handle handle) |
222e82ac | 1293 | { |
ebf4df8d JL |
1294 | char node_name[ACPI_PATH_SEGMENT_LENGTH]; |
1295 | struct acpi_buffer path = { sizeof(node_name), node_name }; | |
222e82ac DW |
1296 | |
1297 | if (!dmi_name_in_vendors("IBM")) | |
ebf4df8d | 1298 | return false; |
222e82ac DW |
1299 | |
1300 | /* Look for SMBS object */ | |
ebf4df8d JL |
1301 | if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || |
1302 | strcmp("SMBS", path.pointer)) | |
1303 | return false; | |
222e82ac DW |
1304 | |
1305 | /* Does it have the necessary (but misnamed) methods? */ | |
952c63e9 JL |
1306 | if (acpi_has_method(handle, "SBI") && |
1307 | acpi_has_method(handle, "SBR") && | |
1308 | acpi_has_method(handle, "SBW")) | |
ebf4df8d JL |
1309 | return true; |
1310 | ||
1311 | return false; | |
222e82ac DW |
1312 | } |
1313 | ||
ae3caa80 JL |
1314 | static bool acpi_object_is_system_bus(acpi_handle handle) |
1315 | { | |
1316 | acpi_handle tmp; | |
1317 | ||
1318 | if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) && | |
1319 | tmp == handle) | |
1320 | return true; | |
1321 | if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) && | |
1322 | tmp == handle) | |
1323 | return true; | |
1324 | ||
1325 | return false; | |
1326 | } | |
1327 | ||
c0af4175 | 1328 | static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, |
c830dbcf | 1329 | int device_type) |
1da177e4 | 1330 | { |
c830dbcf | 1331 | struct acpi_device_info *info = NULL; |
78e25fef | 1332 | struct acpi_pnp_device_id_list *cid_list; |
7f47fa6c | 1333 | int i; |
1da177e4 | 1334 | |
c0af4175 | 1335 | switch (device_type) { |
1da177e4 | 1336 | case ACPI_BUS_TYPE_DEVICE: |
c0af4175 TK |
1337 | if (handle == ACPI_ROOT_OBJECT) { |
1338 | acpi_add_id(pnp, ACPI_SYSTEM_HID); | |
859ac9a4 BH |
1339 | break; |
1340 | } | |
1341 | ||
c830dbcf | 1342 | acpi_get_object_info(handle, &info); |
6091b263 | 1343 | if (!info) { |
8acf4108 | 1344 | pr_err("%s: Error reading device info\n", __func__); |
1da177e4 LT |
1345 | return; |
1346 | } | |
1347 | ||
549e6845 | 1348 | if (info->valid & ACPI_VALID_HID) { |
c0af4175 | 1349 | acpi_add_id(pnp, info->hardware_id.string); |
549e6845 | 1350 | pnp->type.platform_id = 1; |
462ccc35 RW |
1351 | } |
1352 | if (info->valid & ACPI_VALID_CID) { | |
1353 | cid_list = &info->compatible_id_list; | |
1354 | for (i = 0; i < cid_list->count; i++) | |
1355 | acpi_add_id(pnp, cid_list->ids[i].string); | |
57f3674f | 1356 | } |
1da177e4 | 1357 | if (info->valid & ACPI_VALID_ADR) { |
c0af4175 TK |
1358 | pnp->bus_address = info->address; |
1359 | pnp->type.bus_address = 1; | |
1da177e4 | 1360 | } |
ccf78040 | 1361 | if (info->valid & ACPI_VALID_UID) |
c0af4175 | 1362 | pnp->unique_id = kstrdup(info->unique_id.string, |
ccf78040 | 1363 | GFP_KERNEL); |
26095a01 SS |
1364 | if (info->valid & ACPI_VALID_CLS) |
1365 | acpi_add_id(pnp, info->class_code.string); | |
ae843332 | 1366 | |
c830dbcf RW |
1367 | kfree(info); |
1368 | ||
57f3674f BH |
1369 | /* |
1370 | * Some devices don't reliably have _HIDs & _CIDs, so add | |
1371 | * synthetic HIDs to make sure drivers can find them. | |
1372 | */ | |
f64e4275 | 1373 | if (acpi_is_video_device(handle)) { |
c0af4175 | 1374 | acpi_add_id(pnp, ACPI_VIDEO_HID); |
f64e4275 HG |
1375 | pnp->type.backlight = 1; |
1376 | break; | |
1377 | } | |
1378 | if (acpi_bay_match(handle)) | |
c0af4175 | 1379 | acpi_add_id(pnp, ACPI_BAY_HID); |
ebf4df8d | 1380 | else if (acpi_dock_match(handle)) |
c0af4175 | 1381 | acpi_add_id(pnp, ACPI_DOCK_HID); |
ebf4df8d | 1382 | else if (acpi_ibm_smbus_match(handle)) |
c0af4175 | 1383 | acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); |
ae3caa80 JL |
1384 | else if (list_empty(&pnp->ids) && |
1385 | acpi_object_is_system_bus(handle)) { | |
1386 | /* \_SB, \_TZ, LNXSYBUS */ | |
1387 | acpi_add_id(pnp, ACPI_BUS_HID); | |
c0af4175 TK |
1388 | strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); |
1389 | strcpy(pnp->device_class, ACPI_BUS_CLASS); | |
b7b30de5 | 1390 | } |
54735266 | 1391 | |
1da177e4 LT |
1392 | break; |
1393 | case ACPI_BUS_TYPE_POWER: | |
c0af4175 | 1394 | acpi_add_id(pnp, ACPI_POWER_HID); |
1da177e4 LT |
1395 | break; |
1396 | case ACPI_BUS_TYPE_PROCESSOR: | |
c0af4175 | 1397 | acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); |
1da177e4 | 1398 | break; |
1da177e4 | 1399 | case ACPI_BUS_TYPE_THERMAL: |
c0af4175 | 1400 | acpi_add_id(pnp, ACPI_THERMAL_HID); |
1da177e4 LT |
1401 | break; |
1402 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
c0af4175 | 1403 | acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); |
1da177e4 LT |
1404 | break; |
1405 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
c0af4175 | 1406 | acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); |
1da177e4 | 1407 | break; |
a64a62ce LZ |
1408 | case ACPI_BUS_TYPE_ECDT_EC: |
1409 | acpi_add_id(pnp, ACPI_ECDT_HID); | |
1410 | break; | |
1da177e4 | 1411 | } |
1da177e4 LT |
1412 | } |
1413 | ||
c0af4175 TK |
1414 | void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) |
1415 | { | |
1416 | struct acpi_hardware_id *id, *tmp; | |
1417 | ||
1418 | list_for_each_entry_safe(id, tmp, &pnp->ids, list) { | |
6a0d12ef | 1419 | kfree_const(id->id); |
c0af4175 TK |
1420 | kfree(id); |
1421 | } | |
1422 | kfree(pnp->unique_id); | |
1423 | } | |
1424 | ||
b84f196d SS |
1425 | /** |
1426 | * acpi_dma_supported - Check DMA support for the specified device. | |
1427 | * @adev: The pointer to acpi device | |
1428 | * | |
1429 | * Return false if DMA is not supported. Otherwise, return true | |
1430 | */ | |
3d7c821c | 1431 | bool acpi_dma_supported(const struct acpi_device *adev) |
b84f196d SS |
1432 | { |
1433 | if (!adev) | |
1434 | return false; | |
1435 | ||
1436 | if (adev->flags.cca_seen) | |
1437 | return true; | |
1438 | ||
1439 | /* | |
1440 | * Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent | |
1441 | * DMA on "Intel platforms". Presumably that includes all x86 and | |
1442 | * ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y. | |
1443 | */ | |
1444 | if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED)) | |
1445 | return true; | |
1446 | ||
1447 | return false; | |
1448 | } | |
1449 | ||
1450 | /** | |
1451 | * acpi_get_dma_attr - Check the supported DMA attr for the specified device. | |
1452 | * @adev: The pointer to acpi device | |
1453 | * | |
1454 | * Return enum dev_dma_attr. | |
1455 | */ | |
1456 | enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev) | |
1457 | { | |
1458 | if (!acpi_dma_supported(adev)) | |
1459 | return DEV_DMA_NOT_SUPPORTED; | |
1460 | ||
1461 | if (adev->flags.coherent_dma) | |
1462 | return DEV_DMA_COHERENT; | |
1463 | else | |
1464 | return DEV_DMA_NON_COHERENT; | |
1465 | } | |
1466 | ||
c04ac679 LP |
1467 | /** |
1468 | * acpi_dma_get_range() - Get device DMA parameters. | |
1469 | * | |
1470 | * @dev: device to configure | |
bf2ee8d0 | 1471 | * @map: pointer to DMA ranges result |
c04ac679 | 1472 | * |
bf2ee8d0 JL |
1473 | * Evaluate DMA regions and return pointer to DMA regions on |
1474 | * parsing success; it does not update the passed in values on failure. | |
c04ac679 LP |
1475 | * |
1476 | * Return 0 on success, < 0 on failure. | |
1477 | */ | |
bf2ee8d0 | 1478 | int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map) |
c04ac679 LP |
1479 | { |
1480 | struct acpi_device *adev; | |
1481 | LIST_HEAD(list); | |
1482 | struct resource_entry *rentry; | |
1483 | int ret; | |
1484 | struct device *dma_dev = dev; | |
bf2ee8d0 | 1485 | struct bus_dma_region *r; |
c04ac679 LP |
1486 | |
1487 | /* | |
1488 | * Walk the device tree chasing an ACPI companion with a _DMA | |
1489 | * object while we go. Stop if we find a device with an ACPI | |
1490 | * companion containing a _DMA method. | |
1491 | */ | |
1492 | do { | |
1493 | adev = ACPI_COMPANION(dma_dev); | |
1494 | if (adev && acpi_has_method(adev->handle, METHOD_NAME__DMA)) | |
1495 | break; | |
1496 | ||
1497 | dma_dev = dma_dev->parent; | |
1498 | } while (dma_dev); | |
1499 | ||
1500 | if (!dma_dev) | |
1501 | return -ENODEV; | |
1502 | ||
1503 | if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) { | |
1504 | acpi_handle_warn(adev->handle, "_DMA is valid only if _CRS is present\n"); | |
1505 | return -EINVAL; | |
1506 | } | |
1507 | ||
1508 | ret = acpi_dev_get_dma_resources(adev, &list); | |
1509 | if (ret > 0) { | |
bf2ee8d0 JL |
1510 | r = kcalloc(ret + 1, sizeof(*r), GFP_KERNEL); |
1511 | if (!r) { | |
1512 | ret = -ENOMEM; | |
1513 | goto out; | |
1514 | } | |
1515 | ||
64d23ff3 RM |
1516 | *map = r; |
1517 | ||
c04ac679 | 1518 | list_for_each_entry(rentry, &list, node) { |
bf2ee8d0 | 1519 | if (rentry->res->start >= rentry->res->end) { |
64d23ff3 RM |
1520 | kfree(*map); |
1521 | *map = NULL; | |
c04ac679 | 1522 | ret = -EINVAL; |
bf2ee8d0 | 1523 | dev_dbg(dma_dev, "Invalid DMA regions configuration\n"); |
c04ac679 LP |
1524 | goto out; |
1525 | } | |
c04ac679 | 1526 | |
bf2ee8d0 JL |
1527 | r->cpu_start = rentry->res->start; |
1528 | r->dma_start = rentry->res->start - rentry->offset; | |
1529 | r->size = resource_size(rentry->res); | |
1530 | r->offset = rentry->offset; | |
1531 | r++; | |
c04ac679 | 1532 | } |
c04ac679 LP |
1533 | } |
1534 | out: | |
1535 | acpi_dev_free_resource_list(&list); | |
1536 | ||
1537 | return ret >= 0 ? 0 : ret; | |
1538 | } | |
1539 | ||
11a8c5e3 JPB |
1540 | #ifdef CONFIG_IOMMU_API |
1541 | int acpi_iommu_fwspec_init(struct device *dev, u32 id, | |
1542 | struct fwnode_handle *fwnode, | |
1543 | const struct iommu_ops *ops) | |
1544 | { | |
1545 | int ret = iommu_fwspec_init(dev, fwnode, ops); | |
1546 | ||
1547 | if (!ret) | |
1548 | ret = iommu_fwspec_add_ids(dev, &id, 1); | |
1549 | ||
1550 | return ret; | |
1551 | } | |
1552 | ||
1553 | static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev) | |
1554 | { | |
1555 | struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); | |
1556 | ||
1557 | return fwspec ? fwspec->ops : NULL; | |
1558 | } | |
1559 | ||
1560 | static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev, | |
1561 | const u32 *id_in) | |
1562 | { | |
1563 | int err; | |
1564 | const struct iommu_ops *ops; | |
1565 | ||
1566 | /* | |
1567 | * If we already translated the fwspec there is nothing left to do, | |
1568 | * return the iommu_ops. | |
1569 | */ | |
1570 | ops = acpi_iommu_fwspec_ops(dev); | |
1571 | if (ops) | |
1572 | return ops; | |
1573 | ||
1574 | err = iort_iommu_configure_id(dev, id_in); | |
3cf48554 JPB |
1575 | if (err && err != -EPROBE_DEFER) |
1576 | err = viot_iommu_configure(dev); | |
11a8c5e3 JPB |
1577 | |
1578 | /* | |
1579 | * If we have reason to believe the IOMMU driver missed the initial | |
1580 | * iommu_probe_device() call for dev, replay it to get things in order. | |
1581 | */ | |
1582 | if (!err && dev->bus && !device_iommu_mapped(dev)) | |
1583 | err = iommu_probe_device(dev); | |
1584 | ||
1585 | /* Ignore all other errors apart from EPROBE_DEFER */ | |
1586 | if (err == -EPROBE_DEFER) { | |
1587 | return ERR_PTR(err); | |
1588 | } else if (err) { | |
1589 | dev_dbg(dev, "Adding to IOMMU failed: %d\n", err); | |
1590 | return NULL; | |
1591 | } | |
1592 | return acpi_iommu_fwspec_ops(dev); | |
1593 | } | |
1594 | ||
1595 | #else /* !CONFIG_IOMMU_API */ | |
1596 | ||
1597 | int acpi_iommu_fwspec_init(struct device *dev, u32 id, | |
1598 | struct fwnode_handle *fwnode, | |
1599 | const struct iommu_ops *ops) | |
1600 | { | |
1601 | return -ENODEV; | |
1602 | } | |
1603 | ||
1604 | static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev, | |
1605 | const u32 *id_in) | |
1606 | { | |
1607 | return NULL; | |
1608 | } | |
1609 | ||
1610 | #endif /* !CONFIG_IOMMU_API */ | |
1611 | ||
d760a1ba | 1612 | /** |
c1e97359 | 1613 | * acpi_dma_configure_id - Set-up DMA configuration for the device. |
d760a1ba LP |
1614 | * @dev: The pointer to the device |
1615 | * @attr: device dma attributes | |
b8e069a2 | 1616 | * @input_id: input device id const value pointer |
d760a1ba | 1617 | */ |
b8e069a2 LP |
1618 | int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, |
1619 | const u32 *input_id) | |
d760a1ba | 1620 | { |
643b8e4d LP |
1621 | const struct iommu_ops *iommu; |
1622 | ||
e5361ca2 RM |
1623 | if (attr == DEV_DMA_NOT_SUPPORTED) { |
1624 | set_dma_ops(dev, &dma_dummy_ops); | |
1625 | return 0; | |
1626 | } | |
1627 | ||
bf2ee8d0 | 1628 | acpi_arch_dma_setup(dev); |
d760a1ba | 1629 | |
11a8c5e3 | 1630 | iommu = acpi_iommu_configure_id(dev, input_id); |
45586c70 | 1631 | if (PTR_ERR(iommu) == -EPROBE_DEFER) |
058f8c3f | 1632 | return -EPROBE_DEFER; |
643b8e4d | 1633 | |
bf2ee8d0 | 1634 | arch_setup_dma_ops(dev, 0, U64_MAX, |
7ad42639 | 1635 | iommu, attr == DEV_DMA_COHERENT); |
5a1bb638 S |
1636 | |
1637 | return 0; | |
d760a1ba | 1638 | } |
b8e069a2 | 1639 | EXPORT_SYMBOL_GPL(acpi_dma_configure_id); |
d760a1ba | 1640 | |
d0562674 SS |
1641 | static void acpi_init_coherency(struct acpi_device *adev) |
1642 | { | |
1643 | unsigned long long cca = 0; | |
1644 | acpi_status status; | |
62fcb99b | 1645 | struct acpi_device *parent = acpi_dev_parent(adev); |
d0562674 SS |
1646 | |
1647 | if (parent && parent->flags.cca_seen) { | |
1648 | /* | |
1649 | * From ACPI spec, OSPM will ignore _CCA if an ancestor | |
1650 | * already saw one. | |
1651 | */ | |
1652 | adev->flags.cca_seen = 1; | |
1653 | cca = parent->flags.coherent_dma; | |
1654 | } else { | |
1655 | status = acpi_evaluate_integer(adev->handle, "_CCA", | |
1656 | NULL, &cca); | |
1657 | if (ACPI_SUCCESS(status)) | |
1658 | adev->flags.cca_seen = 1; | |
1659 | else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED)) | |
1660 | /* | |
1661 | * If architecture does not specify that _CCA is | |
1662 | * required for DMA-able devices (e.g. x86), | |
1663 | * we default to _CCA=1. | |
1664 | */ | |
1665 | cca = 1; | |
1666 | else | |
1667 | acpi_handle_debug(adev->handle, | |
1668 | "ACPI device is missing _CCA.\n"); | |
1669 | } | |
1670 | ||
1671 | adev->flags.coherent_dma = cca; | |
1672 | } | |
1673 | ||
e361d1f8 | 1674 | static int acpi_check_serial_bus_slave(struct acpi_resource *ares, void *data) |
e4330d8b | 1675 | { |
e361d1f8 | 1676 | bool *is_serial_bus_slave_p = data; |
e4330d8b JN |
1677 | |
1678 | if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) | |
1679 | return 1; | |
1680 | ||
e361d1f8 | 1681 | *is_serial_bus_slave_p = true; |
e4330d8b JN |
1682 | |
1683 | /* no need to do more checking */ | |
1684 | return -1; | |
1685 | } | |
1686 | ||
dfda4492 JG |
1687 | static bool acpi_is_indirect_io_slave(struct acpi_device *device) |
1688 | { | |
62fcb99b | 1689 | struct acpi_device *parent = acpi_dev_parent(device); |
a6f07295 | 1690 | static const struct acpi_device_id indirect_io_hosts[] = { |
dfda4492 JG |
1691 | {"HISI0191", 0}, |
1692 | {} | |
1693 | }; | |
1694 | ||
1695 | return parent && !acpi_match_device_ids(parent, indirect_io_hosts); | |
1696 | } | |
1697 | ||
d87fb091 | 1698 | static bool acpi_device_enumeration_by_parent(struct acpi_device *device) |
e4330d8b JN |
1699 | { |
1700 | struct list_head resource_list; | |
e361d1f8 | 1701 | bool is_serial_bus_slave = false; |
f85196bd | 1702 | static const struct acpi_device_id ignore_serial_bus_ids[] = { |
aba94139 | 1703 | /* |
5e63b2ea LT |
1704 | * These devices have multiple SerialBus resources and a client |
1705 | * device must be instantiated for each of them, each with | |
1706 | * its own device id. | |
1707 | * Normally we only instantiate one client device for the first | |
1708 | * resource, using the ACPI HID as id. These special cases are handled | |
1709 | * by the drivers/platform/x86/serial-multi-instantiate.c driver, which | |
1710 | * knows which client device id to use for each resource. | |
aba94139 | 1711 | */ |
aba94139 | 1712 | {"BSG1160", }, |
96f984d3 | 1713 | {"BSG2150", }, |
d9c01c53 | 1714 | {"CSC3551", }, |
589edb56 | 1715 | {"INT33FE", }, |
a3dd034a | 1716 | {"INT3515", }, |
d9c01c53 LT |
1717 | /* Non-conforming _HID for Cirrus Logic already released */ |
1718 | {"CLSA0100", }, | |
87eb04bb | 1719 | {"CLSA0101", }, |
60c7353c HG |
1720 | /* |
1721 | * Some ACPI devs contain SerialBus resources even though they are not | |
1722 | * attached to a serial bus at all. | |
1723 | */ | |
1724 | {"MSHW0028", }, | |
f85196bd HG |
1725 | /* |
1726 | * HIDs of device with an UartSerialBusV2 resource for which userspace | |
1727 | * expects a regular tty cdev to be created (instead of the in kernel | |
1728 | * serdev) and which have a kernel driver which expects a platform_dev | |
1729 | * such as the rfkill-gpio driver. | |
1730 | */ | |
1731 | {"BCM4752", }, | |
1732 | {"LNV4752", }, | |
aba94139 HG |
1733 | {} |
1734 | }; | |
e4330d8b | 1735 | |
dfda4492 JG |
1736 | if (acpi_is_indirect_io_slave(device)) |
1737 | return true; | |
1738 | ||
ca9ef3ab LW |
1739 | /* Macs use device properties in lieu of _CRS resources */ |
1740 | if (x86_apple_machine && | |
1741 | (fwnode_property_present(&device->fwnode, "spiSclkPeriod") || | |
e361d1f8 FD |
1742 | fwnode_property_present(&device->fwnode, "i2cAddress") || |
1743 | fwnode_property_present(&device->fwnode, "baud"))) | |
ca9ef3ab LW |
1744 | return true; |
1745 | ||
f85196bd | 1746 | if (!acpi_match_device_ids(device, ignore_serial_bus_ids)) |
aba94139 HG |
1747 | return false; |
1748 | ||
e4330d8b | 1749 | INIT_LIST_HEAD(&resource_list); |
e361d1f8 FD |
1750 | acpi_dev_get_resources(device, &resource_list, |
1751 | acpi_check_serial_bus_slave, | |
1752 | &is_serial_bus_slave); | |
e4330d8b JN |
1753 | acpi_dev_free_resource_list(&resource_list); |
1754 | ||
e361d1f8 | 1755 | return is_serial_bus_slave; |
e4330d8b JN |
1756 | } |
1757 | ||
82c7d5ef | 1758 | void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, |
5c5e1237 | 1759 | int type, void (*release)(struct device *)) |
1da177e4 | 1760 | { |
5c5e1237 RW |
1761 | struct acpi_device *parent = acpi_find_parent_acpi_dev(handle); |
1762 | ||
d43e167d RW |
1763 | INIT_LIST_HEAD(&device->pnp.ids); |
1764 | device->device_type = type; | |
1765 | device->handle = handle; | |
62fcb99b | 1766 | device->dev.parent = parent ? &parent->dev : NULL; |
5c5e1237 RW |
1767 | device->dev.release = release; |
1768 | device->dev.bus = &acpi_bus_type; | |
01bb86b3 | 1769 | fwnode_init(&device->fwnode, &acpi_device_fwnode_ops); |
f5d9ab1d | 1770 | acpi_set_device_status(device, ACPI_STA_DEFAULT); |
d43e167d | 1771 | acpi_device_get_busid(device); |
c830dbcf | 1772 | acpi_set_pnp_ids(handle, &device->pnp, type); |
ffdcd955 | 1773 | acpi_init_properties(device); |
d43e167d | 1774 | acpi_bus_get_flags(device); |
2c0d4fe0 | 1775 | device->flags.match_driver = false; |
202317a5 | 1776 | device->flags.initialized = true; |
d87fb091 JG |
1777 | device->flags.enumeration_by_parent = |
1778 | acpi_device_enumeration_by_parent(device); | |
10c7e20b | 1779 | acpi_device_clear_enumerated(device); |
cf860be6 RW |
1780 | device_initialize(&device->dev); |
1781 | dev_set_uevent_suppress(&device->dev, true); | |
d0562674 | 1782 | acpi_init_coherency(device); |
6d279758 RW |
1783 | } |
1784 | ||
1785 | static void acpi_scan_dep_init(struct acpi_device *adev) | |
1786 | { | |
1787 | struct acpi_dep_data *dep; | |
1788 | ||
6d279758 | 1789 | list_for_each_entry(dep, &acpi_dep_list, node) { |
9d9bcae4 HG |
1790 | if (dep->consumer == adev->handle) { |
1791 | if (dep->honor_dep) | |
1792 | adev->flags.honor_deps = 1; | |
1793 | ||
6d279758 | 1794 | adev->dep_unmet++; |
9d9bcae4 | 1795 | } |
6d279758 | 1796 | } |
cf860be6 | 1797 | } |
bc3b0772 | 1798 | |
cf860be6 RW |
1799 | void acpi_device_add_finalize(struct acpi_device *device) |
1800 | { | |
1801 | dev_set_uevent_suppress(&device->dev, false); | |
1802 | kobject_uevent(&device->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
1803 | } |
1804 | ||
f5d9ab1d RW |
1805 | static void acpi_scan_init_status(struct acpi_device *adev) |
1806 | { | |
1807 | if (acpi_bus_get_status(adev)) | |
1808 | acpi_set_device_status(adev, 0); | |
1809 | } | |
1810 | ||
5c478f49 | 1811 | static int acpi_add_single_object(struct acpi_device **child, |
6d279758 | 1812 | acpi_handle handle, int type, bool dep_init) |
1da177e4 | 1813 | { |
e52d9d8c | 1814 | struct acpi_device *device; |
5f4ce260 | 1815 | bool release_dep_lock = false; |
e52d9d8c | 1816 | int result; |
6091b263 | 1817 | |
36bcbec7 | 1818 | device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
c830dbcf | 1819 | if (!device) |
d550d98d | 1820 | return -ENOMEM; |
1da177e4 | 1821 | |
5c5e1237 | 1822 | acpi_init_device_object(device, handle, type, acpi_device_release); |
63347db0 | 1823 | /* |
f5d9ab1d RW |
1824 | * Getting the status is delayed till here so that we can call |
1825 | * acpi_bus_get_status() and use its quirk handling. Note that | |
1826 | * this must be done before the get power-/wakeup_dev-flags calls. | |
63347db0 | 1827 | */ |
6d279758 | 1828 | if (type == ACPI_BUS_TYPE_DEVICE || type == ACPI_BUS_TYPE_PROCESSOR) { |
5f4ce260 RW |
1829 | if (dep_init) { |
1830 | mutex_lock(&acpi_dep_list_lock); | |
1831 | /* | |
1832 | * Hold the lock until the acpi_tie_acpi_dev() call | |
1833 | * below to prevent concurrent acpi_scan_clear_dep() | |
1834 | * from deleting a dependency list entry without | |
1835 | * updating dep_unmet for the device. | |
1836 | */ | |
1837 | release_dep_lock = true; | |
6d279758 | 1838 | acpi_scan_dep_init(device); |
5f4ce260 | 1839 | } |
f5d9ab1d | 1840 | acpi_scan_init_status(device); |
6d279758 | 1841 | } |
63347db0 | 1842 | |
d43e167d | 1843 | acpi_bus_get_power_flags(device); |
d57d09a4 | 1844 | acpi_bus_get_wakeup_device_flags(device); |
1da177e4 | 1845 | |
5f4ce260 RW |
1846 | result = acpi_tie_acpi_dev(device); |
1847 | ||
1848 | if (release_dep_lock) | |
1849 | mutex_unlock(&acpi_dep_list_lock); | |
1850 | ||
1851 | if (!result) | |
6e1850b2 | 1852 | result = acpi_device_add(device); |
5f4ce260 | 1853 | |
d43e167d | 1854 | if (result) { |
718fb0de | 1855 | acpi_device_release(&device->dev); |
d43e167d RW |
1856 | return result; |
1857 | } | |
1da177e4 | 1858 | |
d43e167d | 1859 | acpi_power_add_remove_device(device, true); |
cf860be6 | 1860 | acpi_device_add_finalize(device); |
e52d9d8c RW |
1861 | |
1862 | acpi_handle_debug(handle, "Added as %s, parent %s\n", | |
62fcb99b RW |
1863 | dev_name(&device->dev), device->dev.parent ? |
1864 | dev_name(device->dev.parent) : "(null)"); | |
e52d9d8c | 1865 | |
d43e167d RW |
1866 | *child = device; |
1867 | return 0; | |
bf325f95 RW |
1868 | } |
1869 | ||
a4e081b0 SZ |
1870 | static acpi_status acpi_get_resource_memory(struct acpi_resource *ares, |
1871 | void *context) | |
1872 | { | |
1873 | struct resource *res = context; | |
1874 | ||
1875 | if (acpi_dev_resource_memory(ares, res)) | |
1876 | return AE_CTRL_TERMINATE; | |
1877 | ||
1878 | return AE_OK; | |
1879 | } | |
1880 | ||
1881 | static bool acpi_device_should_be_hidden(acpi_handle handle) | |
1882 | { | |
1883 | acpi_status status; | |
1884 | struct resource res; | |
1885 | ||
1886 | /* Check if it should ignore the UART device */ | |
1887 | if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS))) | |
1888 | return false; | |
1889 | ||
1890 | /* | |
1891 | * The UART device described in SPCR table is assumed to have only one | |
1892 | * memory resource present. So we only look for the first one here. | |
1893 | */ | |
1894 | status = acpi_walk_resources(handle, METHOD_NAME__CRS, | |
1895 | acpi_get_resource_memory, &res); | |
1896 | if (ACPI_FAILURE(status) || res.start != spcr_uart_addr) | |
1897 | return false; | |
1898 | ||
1899 | acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n", | |
1900 | &res.start); | |
1901 | ||
1902 | return true; | |
1903 | } | |
1904 | ||
cde1f95f | 1905 | bool acpi_device_is_present(const struct acpi_device *adev) |
202317a5 | 1906 | { |
cde1f95f | 1907 | return adev->status.present || adev->status.functional; |
202317a5 RW |
1908 | } |
1909 | ||
4b59cc1f | 1910 | static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, |
844142c3 | 1911 | const char *idstr, |
4b59cc1f RW |
1912 | const struct acpi_device_id **matchid) |
1913 | { | |
1914 | const struct acpi_device_id *devid; | |
1915 | ||
aca0a4eb RW |
1916 | if (handler->match) |
1917 | return handler->match(idstr, matchid); | |
1918 | ||
4b59cc1f RW |
1919 | for (devid = handler->ids; devid->id[0]; devid++) |
1920 | if (!strcmp((char *)devid->id, idstr)) { | |
1921 | if (matchid) | |
1922 | *matchid = devid; | |
1923 | ||
1924 | return true; | |
1925 | } | |
1926 | ||
1927 | return false; | |
1928 | } | |
1929 | ||
844142c3 | 1930 | static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr, |
6b772e8f TK |
1931 | const struct acpi_device_id **matchid) |
1932 | { | |
1933 | struct acpi_scan_handler *handler; | |
1934 | ||
1935 | list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) | |
1936 | if (acpi_scan_handler_matching(handler, idstr, matchid)) | |
1937 | return handler; | |
1938 | ||
1939 | return NULL; | |
1940 | } | |
1941 | ||
3f8055c3 RW |
1942 | void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) |
1943 | { | |
3f8055c3 RW |
1944 | if (!!hotplug->enabled == !!val) |
1945 | return; | |
1946 | ||
1947 | mutex_lock(&acpi_scan_lock); | |
1948 | ||
1949 | hotplug->enabled = val; | |
3f8055c3 RW |
1950 | |
1951 | mutex_unlock(&acpi_scan_lock); | |
1952 | } | |
1953 | ||
3c2cc7ff | 1954 | static void acpi_scan_init_hotplug(struct acpi_device *adev) |
a33ec399 | 1955 | { |
6b772e8f | 1956 | struct acpi_hardware_id *hwid; |
a33ec399 | 1957 | |
b43109fa | 1958 | if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) { |
1e2380cd RW |
1959 | acpi_dock_add(adev); |
1960 | return; | |
1961 | } | |
3c2cc7ff RW |
1962 | list_for_each_entry(hwid, &adev->pnp.ids, list) { |
1963 | struct acpi_scan_handler *handler; | |
a33ec399 | 1964 | |
6b772e8f | 1965 | handler = acpi_scan_match_handler(hwid->id, NULL); |
1a699476 RW |
1966 | if (handler) { |
1967 | adev->flags.hotplug_notify = true; | |
1968 | break; | |
1969 | } | |
3c2cc7ff | 1970 | } |
a33ec399 RW |
1971 | } |
1972 | ||
02056a4f | 1973 | static u32 acpi_scan_check_dep(acpi_handle handle, bool check_dep) |
40e7fcb1 | 1974 | { |
40e7fcb1 LT |
1975 | struct acpi_handle_list dep_devices; |
1976 | acpi_status status; | |
6fc25088 | 1977 | u32 count; |
40e7fcb1 LT |
1978 | int i; |
1979 | ||
71da201f RW |
1980 | /* |
1981 | * Check for _HID here to avoid deferring the enumeration of: | |
1982 | * 1. PCI devices. | |
1983 | * 2. ACPI nodes describing USB ports. | |
1984 | * Still, checking for _HID catches more then just these cases ... | |
1985 | */ | |
02056a4f RW |
1986 | if (!check_dep || !acpi_has_method(handle, "_DEP") || |
1987 | !acpi_has_method(handle, "_HID")) | |
6fc25088 | 1988 | return 0; |
40e7fcb1 | 1989 | |
6fc25088 | 1990 | status = acpi_evaluate_reference(handle, "_DEP", NULL, &dep_devices); |
40e7fcb1 | 1991 | if (ACPI_FAILURE(status)) { |
6fc25088 RW |
1992 | acpi_handle_debug(handle, "Failed to evaluate _DEP.\n"); |
1993 | return 0; | |
40e7fcb1 LT |
1994 | } |
1995 | ||
6fc25088 | 1996 | for (count = 0, i = 0; i < dep_devices.count; i++) { |
40e7fcb1 | 1997 | struct acpi_device_info *info; |
6fc25088 | 1998 | struct acpi_dep_data *dep; |
9d9bcae4 | 1999 | bool skip, honor_dep; |
40e7fcb1 LT |
2000 | |
2001 | status = acpi_get_object_info(dep_devices.handles[i], &info); | |
2002 | if (ACPI_FAILURE(status)) { | |
6fc25088 | 2003 | acpi_handle_debug(handle, "Error reading _DEP device info\n"); |
40e7fcb1 LT |
2004 | continue; |
2005 | } | |
2006 | ||
2ef33ee7 | 2007 | skip = acpi_info_matches_ids(info, acpi_ignore_dep_ids); |
9d9bcae4 | 2008 | honor_dep = acpi_info_matches_ids(info, acpi_honor_dep_ids); |
40e7fcb1 LT |
2009 | kfree(info); |
2010 | ||
2011 | if (skip) | |
2012 | continue; | |
2013 | ||
6fc25088 | 2014 | dep = kzalloc(sizeof(*dep), GFP_KERNEL); |
40e7fcb1 | 2015 | if (!dep) |
6fc25088 RW |
2016 | continue; |
2017 | ||
2018 | count++; | |
40e7fcb1 | 2019 | |
91438aeb | 2020 | dep->supplier = dep_devices.handles[i]; |
6fc25088 | 2021 | dep->consumer = handle; |
9d9bcae4 | 2022 | dep->honor_dep = honor_dep; |
40e7fcb1 LT |
2023 | |
2024 | mutex_lock(&acpi_dep_list_lock); | |
2025 | list_add_tail(&dep->node , &acpi_dep_list); | |
2026 | mutex_unlock(&acpi_dep_list_lock); | |
2027 | } | |
6fc25088 RW |
2028 | |
2029 | return count; | |
40e7fcb1 LT |
2030 | } |
2031 | ||
0de7fb7c RW |
2032 | static bool acpi_bus_scan_second_pass; |
2033 | ||
71da201f RW |
2034 | static acpi_status acpi_bus_check_add(acpi_handle handle, bool check_dep, |
2035 | struct acpi_device **adev_p) | |
778cbc1d | 2036 | { |
e3c963c4 | 2037 | struct acpi_device *device = acpi_fetch_acpi_dev(handle); |
e6c1067d | 2038 | acpi_object_type acpi_type; |
6fc25088 | 2039 | int type; |
778cbc1d | 2040 | |
4002bf38 RW |
2041 | if (device) |
2042 | goto out; | |
2043 | ||
e6c1067d | 2044 | if (ACPI_FAILURE(acpi_get_type(handle, &acpi_type))) |
778cbc1d BH |
2045 | return AE_OK; |
2046 | ||
e6c1067d RW |
2047 | switch (acpi_type) { |
2048 | case ACPI_TYPE_DEVICE: | |
2049 | if (acpi_device_should_be_hidden(handle)) | |
2050 | return AE_OK; | |
82c7d5ef | 2051 | |
02056a4f RW |
2052 | /* Bail out if there are dependencies. */ |
2053 | if (acpi_scan_check_dep(handle, check_dep) > 0) { | |
0de7fb7c | 2054 | acpi_bus_scan_second_pass = true; |
71da201f | 2055 | return AE_CTRL_DEPTH; |
0de7fb7c | 2056 | } |
02056a4f | 2057 | |
e6c1067d RW |
2058 | fallthrough; |
2059 | case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ | |
2060 | type = ACPI_BUS_TYPE_DEVICE; | |
2061 | break; | |
2062 | ||
2063 | case ACPI_TYPE_PROCESSOR: | |
e6c1067d RW |
2064 | type = ACPI_BUS_TYPE_PROCESSOR; |
2065 | break; | |
2066 | ||
2067 | case ACPI_TYPE_THERMAL: | |
2068 | type = ACPI_BUS_TYPE_THERMAL; | |
2069 | break; | |
2070 | ||
2071 | case ACPI_TYPE_POWER: | |
82c7d5ef | 2072 | acpi_add_power_resource(handle); |
02056a4f RW |
2073 | fallthrough; |
2074 | default: | |
82c7d5ef | 2075 | return AE_OK; |
71da201f | 2076 | } |
6fc25088 | 2077 | |
3e759425 HG |
2078 | /* |
2079 | * If check_dep is true at this point, the device has no dependencies, | |
2080 | * or the creation of the device object would have been postponed above. | |
2081 | */ | |
6d279758 RW |
2082 | acpi_add_single_object(&device, handle, type, !check_dep); |
2083 | if (!device) | |
2084 | return AE_CTRL_DEPTH; | |
2085 | ||
2086 | acpi_scan_init_hotplug(device); | |
3c2cc7ff | 2087 | |
71da201f RW |
2088 | out: |
2089 | if (!*adev_p) | |
2090 | *adev_p = device; | |
805d410f | 2091 | |
51a85faf BH |
2092 | return AE_OK; |
2093 | } | |
3fb02738 | 2094 | |
71da201f RW |
2095 | static acpi_status acpi_bus_check_add_1(acpi_handle handle, u32 lvl_not_used, |
2096 | void *not_used, void **ret_p) | |
2097 | { | |
2098 | return acpi_bus_check_add(handle, true, (struct acpi_device **)ret_p); | |
2099 | } | |
2100 | ||
2101 | static acpi_status acpi_bus_check_add_2(acpi_handle handle, u32 lvl_not_used, | |
2102 | void *not_used, void **ret_p) | |
2103 | { | |
2104 | return acpi_bus_check_add(handle, false, (struct acpi_device **)ret_p); | |
2105 | } | |
2106 | ||
48459340 ZR |
2107 | static void acpi_default_enumeration(struct acpi_device *device) |
2108 | { | |
48459340 | 2109 | /* |
d87fb091 JG |
2110 | * Do not enumerate devices with enumeration_by_parent flag set as |
2111 | * they will be enumerated by their respective parents. | |
48459340 | 2112 | */ |
d87fb091 | 2113 | if (!device->flags.enumeration_by_parent) { |
1571875b | 2114 | acpi_create_platform_device(device, NULL); |
10c7e20b | 2115 | acpi_device_set_enumerated(device); |
68bdb677 OP |
2116 | } else { |
2117 | blocking_notifier_call_chain(&acpi_reconfig_chain, | |
2118 | ACPI_RECONFIG_DEVICE_ADD, device); | |
10c7e20b | 2119 | } |
48459340 ZR |
2120 | } |
2121 | ||
7d284352 | 2122 | static const struct acpi_device_id generic_device_ids[] = { |
ee892094 | 2123 | {ACPI_DT_NAMESPACE_HID, }, |
7d284352 RW |
2124 | {"", }, |
2125 | }; | |
2126 | ||
2127 | static int acpi_generic_device_attach(struct acpi_device *adev, | |
2128 | const struct acpi_device_id *not_used) | |
2129 | { | |
2130 | /* | |
ee892094 RW |
2131 | * Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test |
2132 | * below can be unconditional. | |
7d284352 RW |
2133 | */ |
2134 | if (adev->data.of_compatible) | |
2135 | acpi_default_enumeration(adev); | |
2136 | ||
2137 | return 1; | |
2138 | } | |
2139 | ||
2140 | static struct acpi_scan_handler generic_device_handler = { | |
2141 | .ids = generic_device_ids, | |
2142 | .attach = acpi_generic_device_attach, | |
2143 | }; | |
2144 | ||
c5698074 | 2145 | static int acpi_scan_attach_handler(struct acpi_device *device) |
ca589f94 | 2146 | { |
c5698074 RW |
2147 | struct acpi_hardware_id *hwid; |
2148 | int ret = 0; | |
ca589f94 | 2149 | |
c5698074 | 2150 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
87b85b3c | 2151 | const struct acpi_device_id *devid; |
c5698074 | 2152 | struct acpi_scan_handler *handler; |
ca589f94 | 2153 | |
c5698074 RW |
2154 | handler = acpi_scan_match_handler(hwid->id, &devid); |
2155 | if (handler) { | |
d34afa9d RW |
2156 | if (!handler->attach) { |
2157 | device->pnp.type.platform_id = 0; | |
2158 | continue; | |
2159 | } | |
9cb32acf | 2160 | device->handler = handler; |
87b85b3c | 2161 | ret = handler->attach(device, devid); |
9cb32acf | 2162 | if (ret > 0) |
c5698074 | 2163 | break; |
9cb32acf RW |
2164 | |
2165 | device->handler = NULL; | |
2166 | if (ret < 0) | |
c5698074 | 2167 | break; |
ca589f94 RW |
2168 | } |
2169 | } | |
48459340 | 2170 | |
ca589f94 RW |
2171 | return ret; |
2172 | } | |
2173 | ||
a976a2ac | 2174 | static int acpi_bus_attach(struct acpi_device *device, void *first_pass) |
51a85faf | 2175 | { |
71da201f | 2176 | bool skip = !first_pass && device->flags.visited; |
1e2380cd | 2177 | acpi_handle ejd; |
ca589f94 | 2178 | int ret; |
3fb02738 | 2179 | |
71da201f RW |
2180 | if (skip) |
2181 | goto ok; | |
2182 | ||
1e2380cd RW |
2183 | if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd))) |
2184 | register_dock_dependent_device(device, ejd); | |
2185 | ||
2c22e652 | 2186 | acpi_bus_get_status(device); |
9d9bcae4 HG |
2187 | /* Skip devices that are not ready for enumeration (e.g. not present) */ |
2188 | if (!acpi_dev_ready_for_enumeration(device)) { | |
cde1f95f | 2189 | device->flags.initialized = false; |
10c7e20b | 2190 | acpi_device_clear_enumerated(device); |
1b1f3e16 | 2191 | device->flags.power_manageable = 0; |
a976a2ac | 2192 | return 0; |
2c22e652 | 2193 | } |
3a391a39 | 2194 | if (device->handler) |
2c22e652 | 2195 | goto ok; |
3a391a39 | 2196 | |
202317a5 | 2197 | if (!device->flags.initialized) { |
1b1f3e16 RW |
2198 | device->flags.power_manageable = |
2199 | device->power.states[ACPI_STATE_D0].flags.valid; | |
2200 | if (acpi_bus_init_power(device)) | |
2201 | device->flags.power_manageable = 0; | |
2202 | ||
202317a5 | 2203 | device->flags.initialized = true; |
c381fc3a RW |
2204 | } else if (device->flags.visited) { |
2205 | goto ok; | |
202317a5 | 2206 | } |
10c7e20b | 2207 | |
ca589f94 | 2208 | ret = acpi_scan_attach_handler(device); |
6931007c | 2209 | if (ret < 0) |
a976a2ac | 2210 | return 0; |
6931007c RW |
2211 | |
2212 | device->flags.match_driver = true; | |
d87fb091 | 2213 | if (ret > 0 && !device->flags.enumeration_by_parent) { |
f406270b RW |
2214 | acpi_device_set_enumerated(device); |
2215 | goto ok; | |
2c22e652 | 2216 | } |
202317a5 | 2217 | |
f406270b RW |
2218 | ret = device_attach(&device->dev); |
2219 | if (ret < 0) | |
a976a2ac | 2220 | return 0; |
f406270b | 2221 | |
d87fb091 | 2222 | if (device->pnp.type.platform_id || device->flags.enumeration_by_parent) |
e4330d8b | 2223 | acpi_default_enumeration(device); |
d87fb091 JG |
2224 | else |
2225 | acpi_device_set_enumerated(device); | |
f406270b | 2226 | |
a976a2ac RW |
2227 | ok: |
2228 | acpi_dev_for_each_child(device, acpi_bus_attach, first_pass); | |
8ab17fc9 | 2229 | |
71da201f | 2230 | if (!skip && device->handler && device->handler->hotplug.notify_online) |
8ab17fc9 | 2231 | device->handler->hotplug.notify_online(device); |
a976a2ac RW |
2232 | |
2233 | return 0; | |
1da177e4 | 2234 | } |
1da177e4 | 2235 | |
cca8a7ef | 2236 | static int acpi_dev_get_next_consumer_dev_cb(struct acpi_dep_data *dep, void *data) |
40e7fcb1 | 2237 | { |
cca8a7ef DS |
2238 | struct acpi_device **adev_p = data; |
2239 | struct acpi_device *adev = *adev_p; | |
2240 | ||
2241 | /* | |
2242 | * If we're passed a 'previous' consumer device then we need to skip | |
2243 | * any consumers until we meet the previous one, and then NULL @data | |
2244 | * so the next one can be returned. | |
2245 | */ | |
2246 | if (adev) { | |
2247 | if (dep->consumer == adev->handle) | |
2248 | *adev_p = NULL; | |
2249 | ||
2250 | return 0; | |
2251 | } | |
40e7fcb1 | 2252 | |
45e9aa1f | 2253 | adev = acpi_get_acpi_dev(dep->consumer); |
ad4d451e RW |
2254 | if (adev) { |
2255 | *(struct acpi_device **)data = adev; | |
2256 | return 1; | |
2257 | } | |
2258 | /* Continue parsing if the device object is not present. */ | |
2259 | return 0; | |
b83e2b30 DS |
2260 | } |
2261 | ||
dc612486 RW |
2262 | struct acpi_scan_clear_dep_work { |
2263 | struct work_struct work; | |
40e7fcb1 | 2264 | struct acpi_device *adev; |
dc612486 RW |
2265 | }; |
2266 | ||
2267 | static void acpi_scan_clear_dep_fn(struct work_struct *work) | |
2268 | { | |
2269 | struct acpi_scan_clear_dep_work *cdw; | |
2270 | ||
2271 | cdw = container_of(work, struct acpi_scan_clear_dep_work, work); | |
40e7fcb1 | 2272 | |
dc612486 | 2273 | acpi_scan_lock_acquire(); |
a976a2ac | 2274 | acpi_bus_attach(cdw->adev, (void *)true); |
dc612486 RW |
2275 | acpi_scan_lock_release(); |
2276 | ||
2277 | acpi_dev_put(cdw->adev); | |
2278 | kfree(cdw); | |
2279 | } | |
2280 | ||
2281 | static bool acpi_scan_clear_dep_queue(struct acpi_device *adev) | |
2282 | { | |
2283 | struct acpi_scan_clear_dep_work *cdw; | |
2284 | ||
2285 | if (adev->dep_unmet) | |
2286 | return false; | |
2287 | ||
2288 | cdw = kmalloc(sizeof(*cdw), GFP_KERNEL); | |
2289 | if (!cdw) | |
2290 | return false; | |
2291 | ||
2292 | cdw->adev = adev; | |
2293 | INIT_WORK(&cdw->work, acpi_scan_clear_dep_fn); | |
2294 | /* | |
2295 | * Since the work function may block on the lock until the entire | |
2296 | * initial enumeration of devices is complete, put it into the unbound | |
2297 | * workqueue. | |
2298 | */ | |
2299 | queue_work(system_unbound_wq, &cdw->work); | |
2300 | ||
2301 | return true; | |
2302 | } | |
2303 | ||
2304 | static int acpi_scan_clear_dep(struct acpi_dep_data *dep, void *data) | |
2305 | { | |
45e9aa1f | 2306 | struct acpi_device *adev = acpi_get_acpi_dev(dep->consumer); |
a9e10e58 DS |
2307 | |
2308 | if (adev) { | |
2309 | adev->dep_unmet--; | |
dc612486 RW |
2310 | if (!acpi_scan_clear_dep_queue(adev)) |
2311 | acpi_dev_put(adev); | |
a9e10e58 DS |
2312 | } |
2313 | ||
2314 | list_del(&dep->node); | |
2315 | kfree(dep); | |
2316 | ||
2317 | return 0; | |
2318 | } | |
2319 | ||
2320 | /** | |
2321 | * acpi_walk_dep_device_list - Apply a callback to every entry in acpi_dep_list | |
2322 | * @handle: The ACPI handle of the supplier device | |
2323 | * @callback: Pointer to the callback function to apply | |
2324 | * @data: Pointer to some data to pass to the callback | |
2325 | * | |
2326 | * The return value of the callback determines this function's behaviour. If 0 | |
2327 | * is returned we continue to iterate over acpi_dep_list. If a positive value | |
2328 | * is returned then the loop is broken but this function returns 0. If a | |
2329 | * negative value is returned by the callback then the loop is broken and that | |
2330 | * value is returned as the final error. | |
2331 | */ | |
aff0dbd0 RW |
2332 | static int acpi_walk_dep_device_list(acpi_handle handle, |
2333 | int (*callback)(struct acpi_dep_data *, void *), | |
2334 | void *data) | |
a9e10e58 DS |
2335 | { |
2336 | struct acpi_dep_data *dep, *tmp; | |
23db673d | 2337 | int ret = 0; |
a9e10e58 | 2338 | |
40e7fcb1 LT |
2339 | mutex_lock(&acpi_dep_list_lock); |
2340 | list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) { | |
91438aeb | 2341 | if (dep->supplier == handle) { |
a9e10e58 DS |
2342 | ret = callback(dep, data); |
2343 | if (ret) | |
2344 | break; | |
40e7fcb1 LT |
2345 | } |
2346 | } | |
2347 | mutex_unlock(&acpi_dep_list_lock); | |
a9e10e58 DS |
2348 | |
2349 | return ret > 0 ? 0 : ret; | |
40e7fcb1 | 2350 | } |
40e7fcb1 | 2351 | |
a9e10e58 DS |
2352 | /** |
2353 | * acpi_dev_clear_dependencies - Inform consumers that the device is now active | |
2354 | * @supplier: Pointer to the supplier &struct acpi_device | |
2355 | * | |
2356 | * Clear dependencies on the given device. | |
2357 | */ | |
2358 | void acpi_dev_clear_dependencies(struct acpi_device *supplier) | |
2359 | { | |
2360 | acpi_walk_dep_device_list(supplier->handle, acpi_scan_clear_dep, NULL); | |
2361 | } | |
2362 | EXPORT_SYMBOL_GPL(acpi_dev_clear_dependencies); | |
2363 | ||
9d9bcae4 HG |
2364 | /** |
2365 | * acpi_dev_ready_for_enumeration - Check if the ACPI device is ready for enumeration | |
2366 | * @device: Pointer to the &struct acpi_device to check | |
2367 | * | |
2368 | * Check if the device is present and has no unmet dependencies. | |
2369 | * | |
2370 | * Return true if the device is ready for enumeratino. Otherwise, return false. | |
2371 | */ | |
2372 | bool acpi_dev_ready_for_enumeration(const struct acpi_device *device) | |
2373 | { | |
2374 | if (device->flags.honor_deps && device->dep_unmet) | |
2375 | return false; | |
2376 | ||
2377 | return acpi_device_is_present(device); | |
2378 | } | |
2379 | EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration); | |
2380 | ||
b83e2b30 | 2381 | /** |
cca8a7ef | 2382 | * acpi_dev_get_next_consumer_dev - Return the next adev dependent on @supplier |
b83e2b30 | 2383 | * @supplier: Pointer to the dependee device |
cca8a7ef | 2384 | * @start: Pointer to the current dependent device |
b83e2b30 | 2385 | * |
cca8a7ef | 2386 | * Returns the next &struct acpi_device which declares itself dependent on |
b83e2b30 DS |
2387 | * @supplier via the _DEP buffer, parsed from the acpi_dep_list. |
2388 | * | |
cca8a7ef DS |
2389 | * If the returned adev is not passed as @start to this function, the caller is |
2390 | * responsible for putting the reference to adev when it is no longer needed. | |
b83e2b30 | 2391 | */ |
cca8a7ef DS |
2392 | struct acpi_device *acpi_dev_get_next_consumer_dev(struct acpi_device *supplier, |
2393 | struct acpi_device *start) | |
b83e2b30 | 2394 | { |
cca8a7ef | 2395 | struct acpi_device *adev = start; |
b83e2b30 DS |
2396 | |
2397 | acpi_walk_dep_device_list(supplier->handle, | |
cca8a7ef DS |
2398 | acpi_dev_get_next_consumer_dev_cb, &adev); |
2399 | ||
2400 | acpi_dev_put(start); | |
2401 | ||
2402 | if (adev == start) | |
2403 | return NULL; | |
b83e2b30 DS |
2404 | |
2405 | return adev; | |
40e7fcb1 | 2406 | } |
cca8a7ef | 2407 | EXPORT_SYMBOL_GPL(acpi_dev_get_next_consumer_dev); |
40e7fcb1 | 2408 | |
636458de | 2409 | /** |
b8bd759a | 2410 | * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. |
636458de | 2411 | * @handle: Root of the namespace scope to scan. |
7779688f | 2412 | * |
636458de RW |
2413 | * Scan a given ACPI tree (probably recently hot-plugged) and create and add |
2414 | * found devices. | |
7779688f | 2415 | * |
636458de RW |
2416 | * If no devices were found, -ENODEV is returned, but it does not mean that |
2417 | * there has been a real error. There just have been no suitable ACPI objects | |
2418 | * in the table trunk from which the kernel could create a device and add an | |
2419 | * appropriate driver. | |
3757b948 RW |
2420 | * |
2421 | * Must be called under acpi_scan_lock. | |
7779688f | 2422 | */ |
b8bd759a | 2423 | int acpi_bus_scan(acpi_handle handle) |
3fb02738 | 2424 | { |
71da201f RW |
2425 | struct acpi_device *device = NULL; |
2426 | ||
0de7fb7c | 2427 | acpi_bus_scan_second_pass = false; |
3fb02738 | 2428 | |
71da201f | 2429 | /* Pass 1: Avoid enumerating devices with missing dependencies. */ |
3fb02738 | 2430 | |
71da201f | 2431 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, true, &device))) |
b8bd759a | 2432 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
71da201f RW |
2433 | acpi_bus_check_add_1, NULL, NULL, |
2434 | (void **)&device); | |
3fb02738 | 2435 | |
71da201f RW |
2436 | if (!device) |
2437 | return -ENODEV; | |
3fb02738 | 2438 | |
a976a2ac | 2439 | acpi_bus_attach(device, (void *)true); |
71da201f | 2440 | |
0de7fb7c | 2441 | if (!acpi_bus_scan_second_pass) |
2c22e652 | 2442 | return 0; |
0de7fb7c | 2443 | |
71da201f RW |
2444 | /* Pass 2: Enumerate all of the remaining devices. */ |
2445 | ||
2446 | device = NULL; | |
2447 | ||
2448 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, false, &device))) | |
2449 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
2450 | acpi_bus_check_add_2, NULL, NULL, | |
2451 | (void **)&device); | |
2452 | ||
a976a2ac | 2453 | acpi_bus_attach(device, NULL); |
71da201f RW |
2454 | |
2455 | return 0; | |
3fb02738 | 2456 | } |
2c22e652 | 2457 | EXPORT_SYMBOL(acpi_bus_scan); |
1da177e4 | 2458 | |
a976a2ac | 2459 | static int acpi_bus_trim_one(struct acpi_device *adev, void *not_used) |
1da177e4 | 2460 | { |
2c22e652 | 2461 | struct acpi_scan_handler *handler = adev->handler; |
2c22e652 | 2462 | |
a976a2ac | 2463 | acpi_dev_for_each_child_reverse(adev, acpi_bus_trim_one, NULL); |
2c22e652 | 2464 | |
a951c773 | 2465 | adev->flags.match_driver = false; |
2c22e652 RW |
2466 | if (handler) { |
2467 | if (handler->detach) | |
2468 | handler->detach(adev); | |
2469 | ||
2470 | adev->handler = NULL; | |
2471 | } else { | |
2472 | device_release_driver(&adev->dev); | |
2473 | } | |
05404d8f | 2474 | /* |
2c22e652 RW |
2475 | * Most likely, the device is going away, so put it into D3cold before |
2476 | * that. | |
05404d8f | 2477 | */ |
2c22e652 RW |
2478 | acpi_device_set_power(adev, ACPI_STATE_D3_COLD); |
2479 | adev->flags.initialized = false; | |
10c7e20b | 2480 | acpi_device_clear_enumerated(adev); |
a976a2ac RW |
2481 | |
2482 | return 0; | |
2483 | } | |
2484 | ||
2485 | /** | |
2486 | * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects. | |
2487 | * @adev: Root of the ACPI namespace scope to walk. | |
2488 | * | |
2489 | * Must be called under acpi_scan_lock. | |
2490 | */ | |
2491 | void acpi_bus_trim(struct acpi_device *adev) | |
2492 | { | |
2493 | acpi_bus_trim_one(adev, NULL); | |
1da177e4 | 2494 | } |
ceaba663 KA |
2495 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
2496 | ||
a64a62ce LZ |
2497 | int acpi_bus_register_early_device(int type) |
2498 | { | |
2499 | struct acpi_device *device = NULL; | |
2500 | int result; | |
2501 | ||
6d279758 | 2502 | result = acpi_add_single_object(&device, NULL, type, false); |
a64a62ce LZ |
2503 | if (result) |
2504 | return result; | |
2505 | ||
2506 | device->flags.match_driver = true; | |
2507 | return device_attach(&device->dev); | |
2508 | } | |
2509 | EXPORT_SYMBOL_GPL(acpi_bus_register_early_device); | |
2510 | ||
681e7187 | 2511 | static void acpi_bus_scan_fixed(void) |
1da177e4 | 2512 | { |
2c0d4fe0 | 2513 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { |
681e7187 RW |
2514 | struct acpi_device *adev = NULL; |
2515 | ||
2516 | acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_POWER_BUTTON, | |
2517 | false); | |
2518 | if (adev) { | |
2519 | adev->flags.match_driver = true; | |
2520 | if (device_attach(&adev->dev) >= 0) | |
2521 | device_init_wakeup(&adev->dev, true); | |
2522 | else | |
2523 | dev_dbg(&adev->dev, "No driver\n"); | |
2524 | } | |
3fb02738 | 2525 | } |
1da177e4 | 2526 | |
2c0d4fe0 | 2527 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { |
681e7187 RW |
2528 | struct acpi_device *adev = NULL; |
2529 | ||
2530 | acpi_add_single_object(&adev, NULL, ACPI_BUS_TYPE_SLEEP_BUTTON, | |
2531 | false); | |
2532 | if (adev) { | |
2533 | adev->flags.match_driver = true; | |
2534 | if (device_attach(&adev->dev) < 0) | |
2535 | dev_dbg(&adev->dev, "No driver\n"); | |
2536 | } | |
3fb02738 | 2537 | } |
1da177e4 LT |
2538 | } |
2539 | ||
a4e081b0 SZ |
2540 | static void __init acpi_get_spcr_uart_addr(void) |
2541 | { | |
2542 | acpi_status status; | |
2543 | struct acpi_table_spcr *spcr_ptr; | |
2544 | ||
2545 | status = acpi_get_table(ACPI_SIG_SPCR, 0, | |
2546 | (struct acpi_table_header **)&spcr_ptr); | |
ead7ba13 | 2547 | if (ACPI_FAILURE(status)) { |
8acf4108 | 2548 | pr_warn("STAO table present, but SPCR is missing\n"); |
ead7ba13 HG |
2549 | return; |
2550 | } | |
2551 | ||
2552 | spcr_uart_addr = spcr_ptr->serial_port.address; | |
2553 | acpi_put_table((struct acpi_table_header *)spcr_ptr); | |
a4e081b0 SZ |
2554 | } |
2555 | ||
68bdb677 OP |
2556 | static bool acpi_scan_initialized; |
2557 | ||
b6c55b16 | 2558 | void __init acpi_scan_init(void) |
1da177e4 | 2559 | { |
a4e081b0 SZ |
2560 | acpi_status status; |
2561 | struct acpi_table_stao *stao_ptr; | |
1da177e4 | 2562 | |
92ef2a25 | 2563 | acpi_pci_root_init(); |
4daeaf68 | 2564 | acpi_pci_link_init(); |
ac212b69 | 2565 | acpi_processor_init(); |
cb0701ac | 2566 | acpi_platform_init(); |
f58b082a | 2567 | acpi_lpss_init(); |
92082a88 | 2568 | acpi_apd_init(); |
2fa97feb | 2569 | acpi_cmos_rtc_init(); |
737f1a9f | 2570 | acpi_container_init(); |
0a347644 | 2571 | acpi_memory_hotplug_init(); |
cc6a0e31 | 2572 | acpi_watchdog_init(); |
eec15edb | 2573 | acpi_pnp_init(); |
3230bbfc | 2574 | acpi_int340x_thermal_init(); |
6ce2e188 | 2575 | acpi_amba_init(); |
eeb2d80d | 2576 | acpi_init_lpit(); |
97d9a9e9 | 2577 | |
7d284352 RW |
2578 | acpi_scan_add_handler(&generic_device_handler); |
2579 | ||
a4e081b0 SZ |
2580 | /* |
2581 | * If there is STAO table, check whether it needs to ignore the UART | |
2582 | * device in SPCR table. | |
2583 | */ | |
2584 | status = acpi_get_table(ACPI_SIG_STAO, 0, | |
2585 | (struct acpi_table_header **)&stao_ptr); | |
2586 | if (ACPI_SUCCESS(status)) { | |
2587 | if (stao_ptr->header.length > sizeof(struct acpi_table_stao)) | |
8acf4108 | 2588 | pr_info("STAO Name List not yet supported.\n"); |
a4e081b0 SZ |
2589 | |
2590 | if (stao_ptr->ignore_uart) | |
2591 | acpi_get_spcr_uart_addr(); | |
ead7ba13 HG |
2592 | |
2593 | acpi_put_table((struct acpi_table_header *)stao_ptr); | |
a4e081b0 SZ |
2594 | } |
2595 | ||
eb7f43c4 RW |
2596 | acpi_gpe_apply_masked_gpes(); |
2597 | acpi_update_all_gpes(); | |
2598 | ||
7291edca DH |
2599 | /* |
2600 | * Although we call __add_memory() that is documented to require the | |
2601 | * device_hotplug_lock, it is not necessary here because this is an | |
2602 | * early code when userspace or any other code path cannot trigger | |
2603 | * hotplug/hotunplug operations. | |
2604 | */ | |
3757b948 | 2605 | mutex_lock(&acpi_scan_lock); |
1da177e4 LT |
2606 | /* |
2607 | * Enumerate devices in the ACPI namespace. | |
2608 | */ | |
b6c55b16 | 2609 | if (acpi_bus_scan(ACPI_ROOT_OBJECT)) |
c96f195d | 2610 | goto unlock; |
1da177e4 | 2611 | |
e3c963c4 RW |
2612 | acpi_root = acpi_fetch_acpi_dev(ACPI_ROOT_OBJECT); |
2613 | if (!acpi_root) | |
c96f195d | 2614 | goto unlock; |
1da177e4 | 2615 | |
2650ef42 | 2616 | /* Fixed feature devices do not exist on HW-reduced platform */ |
681e7187 RW |
2617 | if (!acpi_gbl_reduced_hardware) |
2618 | acpi_bus_scan_fixed(); | |
1da177e4 | 2619 | |
6381195a | 2620 | acpi_turn_off_unused_power_resources(); |
29038ae2 | 2621 | |
68bdb677 OP |
2622 | acpi_scan_initialized = true; |
2623 | ||
c96f195d | 2624 | unlock: |
3757b948 | 2625 | mutex_unlock(&acpi_scan_lock); |
1da177e4 | 2626 | } |
e647b532 MZ |
2627 | |
2628 | static struct acpi_probe_entry *ape; | |
2629 | static int acpi_probe_count; | |
5331d9ca | 2630 | static DEFINE_MUTEX(acpi_probe_mutex); |
e647b532 | 2631 | |
60574d1e | 2632 | static int __init acpi_match_madt(union acpi_subtable_headers *header, |
e647b532 MZ |
2633 | const unsigned long end) |
2634 | { | |
60574d1e | 2635 | if (!ape->subtable_valid || ape->subtable_valid(&header->common, ape)) |
e647b532 MZ |
2636 | if (!ape->probe_subtbl(header, end)) |
2637 | acpi_probe_count++; | |
2638 | ||
2639 | return 0; | |
2640 | } | |
2641 | ||
2642 | int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr) | |
2643 | { | |
2644 | int count = 0; | |
2645 | ||
2646 | if (acpi_disabled) | |
2647 | return 0; | |
2648 | ||
5331d9ca | 2649 | mutex_lock(&acpi_probe_mutex); |
e647b532 | 2650 | for (ape = ap_head; nr; ape++, nr--) { |
5599fb69 | 2651 | if (ACPI_COMPARE_NAMESEG(ACPI_SIG_MADT, ape->id)) { |
e647b532 MZ |
2652 | acpi_probe_count = 0; |
2653 | acpi_table_parse_madt(ape->type, acpi_match_madt, 0); | |
2654 | count += acpi_probe_count; | |
2655 | } else { | |
2656 | int res; | |
2657 | res = acpi_table_parse(ape->id, ape->probe_table); | |
2658 | if (!res) | |
2659 | count++; | |
2660 | } | |
2661 | } | |
5331d9ca | 2662 | mutex_unlock(&acpi_probe_mutex); |
e647b532 MZ |
2663 | |
2664 | return count; | |
2665 | } | |
68bdb677 | 2666 | |
68bdb677 OP |
2667 | static void acpi_table_events_fn(struct work_struct *work) |
2668 | { | |
8d287e82 RW |
2669 | acpi_scan_lock_acquire(); |
2670 | acpi_bus_scan(ACPI_ROOT_OBJECT); | |
2671 | acpi_scan_lock_release(); | |
68bdb677 | 2672 | |
8d287e82 | 2673 | kfree(work); |
68bdb677 OP |
2674 | } |
2675 | ||
8d287e82 | 2676 | void acpi_scan_table_notify(void) |
68bdb677 | 2677 | { |
8d287e82 | 2678 | struct work_struct *work; |
68bdb677 OP |
2679 | |
2680 | if (!acpi_scan_initialized) | |
2681 | return; | |
2682 | ||
8d287e82 RW |
2683 | work = kmalloc(sizeof(*work), GFP_KERNEL); |
2684 | if (!work) | |
68bdb677 OP |
2685 | return; |
2686 | ||
8d287e82 RW |
2687 | INIT_WORK(work, acpi_table_events_fn); |
2688 | schedule_work(work); | |
68bdb677 OP |
2689 | } |
2690 | ||
2691 | int acpi_reconfig_notifier_register(struct notifier_block *nb) | |
2692 | { | |
2693 | return blocking_notifier_chain_register(&acpi_reconfig_chain, nb); | |
2694 | } | |
2695 | EXPORT_SYMBOL(acpi_reconfig_notifier_register); | |
2696 | ||
2697 | int acpi_reconfig_notifier_unregister(struct notifier_block *nb) | |
2698 | { | |
2699 | return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb); | |
2700 | } | |
2701 | EXPORT_SYMBOL(acpi_reconfig_notifier_unregister); |