Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * scan.c - support for transforming the ACPI namespace into individual objects | |
3 | */ | |
4 | ||
5 | #include <linux/module.h> | |
6 | #include <linux/init.h> | |
5a0e3ad6 | 7 | #include <linux/slab.h> |
9b6d97b6 | 8 | #include <linux/kernel.h> |
1da177e4 | 9 | #include <linux/acpi.h> |
74523c90 AK |
10 | #include <linux/signal.h> |
11 | #include <linux/kthread.h> | |
222e82ac | 12 | #include <linux/dmi.h> |
d1efe3c3 | 13 | #include <linux/nls.h> |
1da177e4 | 14 | |
d783156e RW |
15 | #include <asm/pgtable.h> |
16 | ||
e60cc7a6 BH |
17 | #include "internal.h" |
18 | ||
1da177e4 | 19 | #define _COMPONENT ACPI_BUS_COMPONENT |
f52fd66d | 20 | ACPI_MODULE_NAME("scan"); |
4be44fcd | 21 | extern struct acpi_device *acpi_root; |
1da177e4 LT |
22 | |
23 | #define ACPI_BUS_CLASS "system_bus" | |
29b71a1c | 24 | #define ACPI_BUS_HID "LNXSYBUS" |
1da177e4 LT |
25 | #define ACPI_BUS_DEVICE_NAME "System Bus" |
26 | ||
859ac9a4 BH |
27 | #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent) |
28 | ||
d783156e RW |
29 | #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page) |
30 | ||
683058e3 RW |
31 | /* |
32 | * If set, devices will be hot-removed even if they cannot be put offline | |
33 | * gracefully (from the kernel's standpoint). | |
34 | */ | |
35 | bool acpi_force_hot_remove; | |
36 | ||
620e112c | 37 | static const char *dummy_hid = "device"; |
2b2ae7c7 | 38 | |
40e7fcb1 LT |
39 | static LIST_HEAD(acpi_dep_list); |
40 | static DEFINE_MUTEX(acpi_dep_list_lock); | |
e49bd2dd | 41 | static LIST_HEAD(acpi_bus_id_list); |
c511cc19 | 42 | static DEFINE_MUTEX(acpi_scan_lock); |
ca589f94 | 43 | static LIST_HEAD(acpi_scan_handlers_list); |
9090589d | 44 | DEFINE_MUTEX(acpi_device_lock); |
1da177e4 | 45 | LIST_HEAD(acpi_wakeup_device_list); |
e525506f | 46 | static DEFINE_MUTEX(acpi_hp_context_lock); |
1da177e4 | 47 | |
40e7fcb1 LT |
48 | struct acpi_dep_data { |
49 | struct list_head node; | |
50 | acpi_handle master; | |
51 | acpi_handle slave; | |
52 | }; | |
53 | ||
e49bd2dd | 54 | struct acpi_device_bus_id{ |
bb095854 | 55 | char bus_id[15]; |
e49bd2dd ZR |
56 | unsigned int instance_no; |
57 | struct list_head node; | |
1da177e4 | 58 | }; |
29b71a1c | 59 | |
3757b948 RW |
60 | void acpi_scan_lock_acquire(void) |
61 | { | |
62 | mutex_lock(&acpi_scan_lock); | |
63 | } | |
64 | EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire); | |
65 | ||
66 | void acpi_scan_lock_release(void) | |
67 | { | |
68 | mutex_unlock(&acpi_scan_lock); | |
69 | } | |
70 | EXPORT_SYMBOL_GPL(acpi_scan_lock_release); | |
71 | ||
e525506f RW |
72 | void acpi_lock_hp_context(void) |
73 | { | |
74 | mutex_lock(&acpi_hp_context_lock); | |
75 | } | |
76 | ||
77 | void acpi_unlock_hp_context(void) | |
78 | { | |
79 | mutex_unlock(&acpi_hp_context_lock); | |
80 | } | |
81 | ||
5d513205 RW |
82 | void acpi_initialize_hp_context(struct acpi_device *adev, |
83 | struct acpi_hotplug_context *hp, | |
84 | int (*notify)(struct acpi_device *, u32), | |
85 | void (*uevent)(struct acpi_device *, u32)) | |
86 | { | |
87 | acpi_lock_hp_context(); | |
ba574dc8 RW |
88 | hp->notify = notify; |
89 | hp->uevent = uevent; | |
90 | acpi_set_hp_context(adev, hp); | |
5d513205 RW |
91 | acpi_unlock_hp_context(); |
92 | } | |
93 | EXPORT_SYMBOL_GPL(acpi_initialize_hp_context); | |
94 | ||
ca589f94 RW |
95 | int acpi_scan_add_handler(struct acpi_scan_handler *handler) |
96 | { | |
d34afa9d | 97 | if (!handler) |
ca589f94 RW |
98 | return -EINVAL; |
99 | ||
100 | list_add_tail(&handler->list_node, &acpi_scan_handlers_list); | |
101 | return 0; | |
102 | } | |
103 | ||
3f8055c3 RW |
104 | int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler, |
105 | const char *hotplug_profile_name) | |
106 | { | |
107 | int error; | |
108 | ||
109 | error = acpi_scan_add_handler(handler); | |
110 | if (error) | |
111 | return error; | |
112 | ||
113 | acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name); | |
114 | return 0; | |
115 | } | |
116 | ||
29b71a1c TR |
117 | /* |
118 | * Creates hid/cid(s) string needed for modalias and uevent | |
119 | * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: | |
120 | * char *modalias: "acpi:IBM0001:ACPI0001" | |
3d8e0090 ZR |
121 | * Return: 0: no _HID and no _CID |
122 | * -EINVAL: output error | |
123 | * -ENOMEM: output is truncated | |
29b71a1c | 124 | */ |
b3e572d2 AB |
125 | static int create_modalias(struct acpi_device *acpi_dev, char *modalias, |
126 | int size) | |
127 | { | |
29b71a1c | 128 | int len; |
5c9fcb5d | 129 | int count; |
7f47fa6c | 130 | struct acpi_hardware_id *id; |
29b71a1c | 131 | |
2b2ae7c7 TR |
132 | if (list_empty(&acpi_dev->pnp.ids)) |
133 | return 0; | |
134 | ||
733e6251 MW |
135 | /* |
136 | * If the device has PRP0001 we expose DT compatible modalias | |
137 | * instead in form of of:NnameTCcompatible. | |
138 | */ | |
139 | if (acpi_dev->data.of_compatible) { | |
140 | struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; | |
141 | const union acpi_object *of_compatible, *obj; | |
142 | int i, nval; | |
143 | char *c; | |
144 | ||
145 | acpi_get_name(acpi_dev->handle, ACPI_SINGLE_NAME, &buf); | |
146 | /* DT strings are all in lower case */ | |
147 | for (c = buf.pointer; *c != '\0'; c++) | |
148 | *c = tolower(*c); | |
149 | ||
150 | len = snprintf(modalias, size, "of:N%sT", (char *)buf.pointer); | |
151 | ACPI_FREE(buf.pointer); | |
152 | ||
153 | of_compatible = acpi_dev->data.of_compatible; | |
154 | if (of_compatible->type == ACPI_TYPE_PACKAGE) { | |
155 | nval = of_compatible->package.count; | |
156 | obj = of_compatible->package.elements; | |
157 | } else { /* Must be ACPI_TYPE_STRING. */ | |
158 | nval = 1; | |
159 | obj = of_compatible; | |
160 | } | |
161 | for (i = 0; i < nval; i++, obj++) { | |
162 | count = snprintf(&modalias[len], size, "C%s", | |
163 | obj->string.pointer); | |
164 | if (count < 0) | |
165 | return -EINVAL; | |
166 | if (count >= size) | |
167 | return -ENOMEM; | |
168 | ||
169 | len += count; | |
170 | size -= count; | |
171 | } | |
172 | } else { | |
173 | len = snprintf(modalias, size, "acpi:"); | |
174 | size -= len; | |
175 | ||
176 | list_for_each_entry(id, &acpi_dev->pnp.ids, list) { | |
177 | count = snprintf(&modalias[len], size, "%s:", id->id); | |
178 | if (count < 0) | |
179 | return -EINVAL; | |
180 | if (count >= size) | |
181 | return -ENOMEM; | |
182 | len += count; | |
183 | size -= count; | |
184 | } | |
5c9fcb5d ZR |
185 | } |
186 | ||
29b71a1c TR |
187 | modalias[len] = '\0'; |
188 | return len; | |
189 | } | |
190 | ||
52870786 MW |
191 | /* |
192 | * acpi_companion_match() - Can we match via ACPI companion device | |
193 | * @dev: Device in question | |
194 | * | |
195 | * Check if the given device has an ACPI companion and if that companion has | |
196 | * a valid list of PNP IDs, and if the device is the first (primary) physical | |
197 | * device associated with it. | |
198 | * | |
199 | * If multiple physical devices are attached to a single ACPI companion, we need | |
200 | * to be careful. The usage scenario for this kind of relationship is that all | |
201 | * of the physical devices in question use resources provided by the ACPI | |
202 | * companion. A typical case is an MFD device where all the sub-devices share | |
203 | * the parent's ACPI companion. In such cases we can only allow the primary | |
204 | * (first) physical device to be matched with the help of the companion's PNP | |
205 | * IDs. | |
206 | * | |
207 | * Additional physical devices sharing the ACPI companion can still use | |
208 | * resources available from it but they will be matched normally using functions | |
209 | * provided by their bus types (and analogously for their modalias). | |
210 | */ | |
211 | static bool acpi_companion_match(const struct device *dev) | |
212 | { | |
213 | struct acpi_device *adev; | |
214 | bool ret; | |
215 | ||
216 | adev = ACPI_COMPANION(dev); | |
217 | if (!adev) | |
218 | return false; | |
219 | ||
220 | if (list_empty(&adev->pnp.ids)) | |
221 | return false; | |
222 | ||
223 | mutex_lock(&adev->physical_node_lock); | |
224 | if (list_empty(&adev->physical_node_list)) { | |
225 | ret = false; | |
226 | } else { | |
227 | const struct acpi_device_physical_node *node; | |
228 | ||
229 | node = list_first_entry(&adev->physical_node_list, | |
230 | struct acpi_device_physical_node, node); | |
231 | ret = node->dev == dev; | |
232 | } | |
233 | mutex_unlock(&adev->physical_node_lock); | |
234 | ||
235 | return ret; | |
236 | } | |
237 | ||
6eb2451f ZR |
238 | /* |
239 | * Creates uevent modalias field for ACPI enumerated devices. | |
240 | * Because the other buses does not support ACPI HIDs & CIDs. | |
241 | * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get: | |
242 | * "acpi:IBM0001:ACPI0001" | |
243 | */ | |
244 | int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env) | |
245 | { | |
6eb2451f ZR |
246 | int len; |
247 | ||
52870786 | 248 | if (!acpi_companion_match(dev)) |
6eb2451f ZR |
249 | return -ENODEV; |
250 | ||
251 | if (add_uevent_var(env, "MODALIAS=")) | |
252 | return -ENOMEM; | |
52870786 | 253 | len = create_modalias(ACPI_COMPANION(dev), &env->buf[env->buflen - 1], |
6eb2451f ZR |
254 | sizeof(env->buf) - env->buflen); |
255 | if (len <= 0) | |
256 | return len; | |
257 | env->buflen += len; | |
258 | return 0; | |
259 | } | |
260 | EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias); | |
261 | ||
262 | /* | |
263 | * Creates modalias sysfs attribute for ACPI enumerated devices. | |
264 | * Because the other buses does not support ACPI HIDs & CIDs. | |
265 | * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get: | |
266 | * "acpi:IBM0001:ACPI0001" | |
267 | */ | |
268 | int acpi_device_modalias(struct device *dev, char *buf, int size) | |
269 | { | |
6eb2451f ZR |
270 | int len; |
271 | ||
52870786 | 272 | if (!acpi_companion_match(dev)) |
6eb2451f ZR |
273 | return -ENODEV; |
274 | ||
52870786 | 275 | len = create_modalias(ACPI_COMPANION(dev), buf, size -1); |
6eb2451f ZR |
276 | if (len <= 0) |
277 | return len; | |
278 | buf[len++] = '\n'; | |
279 | return len; | |
280 | } | |
281 | EXPORT_SYMBOL_GPL(acpi_device_modalias); | |
282 | ||
29b71a1c TR |
283 | static ssize_t |
284 | acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
285 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
286 | int len; | |
287 | ||
29b71a1c TR |
288 | len = create_modalias(acpi_dev, buf, 1024); |
289 | if (len <= 0) | |
3d8e0090 | 290 | return len; |
29b71a1c TR |
291 | buf[len++] = '\n'; |
292 | return len; | |
293 | } | |
294 | static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); | |
295 | ||
caa73ea1 | 296 | bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent) |
d22ddcbc RW |
297 | { |
298 | struct acpi_device_physical_node *pn; | |
299 | bool offline = true; | |
300 | ||
301 | mutex_lock(&adev->physical_node_lock); | |
302 | ||
303 | list_for_each_entry(pn, &adev->physical_node_list, node) | |
304 | if (device_supports_offline(pn->dev) && !pn->dev->offline) { | |
caa73ea1 RW |
305 | if (uevent) |
306 | kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE); | |
307 | ||
d22ddcbc RW |
308 | offline = false; |
309 | break; | |
310 | } | |
311 | ||
312 | mutex_unlock(&adev->physical_node_lock); | |
313 | return offline; | |
314 | } | |
315 | ||
7f28ddec RW |
316 | static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data, |
317 | void **ret_p) | |
683058e3 RW |
318 | { |
319 | struct acpi_device *device = NULL; | |
320 | struct acpi_device_physical_node *pn; | |
303bfdb1 | 321 | bool second_pass = (bool)data; |
683058e3 RW |
322 | acpi_status status = AE_OK; |
323 | ||
324 | if (acpi_bus_get_device(handle, &device)) | |
325 | return AE_OK; | |
326 | ||
7f28ddec RW |
327 | if (device->handler && !device->handler->hotplug.enabled) { |
328 | *ret_p = &device->dev; | |
329 | return AE_SUPPORT; | |
330 | } | |
331 | ||
683058e3 RW |
332 | mutex_lock(&device->physical_node_lock); |
333 | ||
334 | list_for_each_entry(pn, &device->physical_node_list, node) { | |
335 | int ret; | |
336 | ||
303bfdb1 RW |
337 | if (second_pass) { |
338 | /* Skip devices offlined by the first pass. */ | |
339 | if (pn->put_online) | |
340 | continue; | |
341 | } else { | |
342 | pn->put_online = false; | |
343 | } | |
683058e3 RW |
344 | ret = device_offline(pn->dev); |
345 | if (acpi_force_hot_remove) | |
346 | continue; | |
347 | ||
303bfdb1 RW |
348 | if (ret >= 0) { |
349 | pn->put_online = !ret; | |
350 | } else { | |
351 | *ret_p = pn->dev; | |
352 | if (second_pass) { | |
353 | status = AE_ERROR; | |
354 | break; | |
355 | } | |
683058e3 | 356 | } |
683058e3 RW |
357 | } |
358 | ||
359 | mutex_unlock(&device->physical_node_lock); | |
360 | ||
361 | return status; | |
362 | } | |
363 | ||
7f28ddec RW |
364 | static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data, |
365 | void **ret_p) | |
683058e3 RW |
366 | { |
367 | struct acpi_device *device = NULL; | |
368 | struct acpi_device_physical_node *pn; | |
369 | ||
370 | if (acpi_bus_get_device(handle, &device)) | |
371 | return AE_OK; | |
372 | ||
373 | mutex_lock(&device->physical_node_lock); | |
374 | ||
375 | list_for_each_entry(pn, &device->physical_node_list, node) | |
376 | if (pn->put_online) { | |
377 | device_online(pn->dev); | |
378 | pn->put_online = false; | |
379 | } | |
380 | ||
381 | mutex_unlock(&device->physical_node_lock); | |
382 | ||
383 | return AE_OK; | |
384 | } | |
385 | ||
d22ddcbc | 386 | static int acpi_scan_try_to_offline(struct acpi_device *device) |
1da177e4 | 387 | { |
5993c467 | 388 | acpi_handle handle = device->handle; |
d22ddcbc | 389 | struct device *errdev = NULL; |
a33ec399 | 390 | acpi_status status; |
f058cdf4 | 391 | |
303bfdb1 RW |
392 | /* |
393 | * Carry out two passes here and ignore errors in the first pass, | |
394 | * because if the devices in question are memory blocks and | |
395 | * CONFIG_MEMCG is set, one of the blocks may hold data structures | |
396 | * that the other blocks depend on, but it is not known in advance which | |
397 | * block holds them. | |
398 | * | |
399 | * If the first pass is successful, the second one isn't needed, though. | |
400 | */ | |
7f28ddec RW |
401 | status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
402 | NULL, acpi_bus_offline, (void *)false, | |
403 | (void **)&errdev); | |
404 | if (status == AE_SUPPORT) { | |
405 | dev_warn(errdev, "Offline disabled.\n"); | |
406 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
407 | acpi_bus_online, NULL, NULL, NULL); | |
7f28ddec RW |
408 | return -EPERM; |
409 | } | |
410 | acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev); | |
303bfdb1 RW |
411 | if (errdev) { |
412 | errdev = NULL; | |
683058e3 | 413 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
7f28ddec RW |
414 | NULL, acpi_bus_offline, (void *)true, |
415 | (void **)&errdev); | |
303bfdb1 | 416 | if (!errdev || acpi_force_hot_remove) |
7f28ddec RW |
417 | acpi_bus_offline(handle, 0, (void *)true, |
418 | (void **)&errdev); | |
303bfdb1 RW |
419 | |
420 | if (errdev && !acpi_force_hot_remove) { | |
421 | dev_warn(errdev, "Offline failed.\n"); | |
7f28ddec | 422 | acpi_bus_online(handle, 0, NULL, NULL); |
303bfdb1 | 423 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, |
7f28ddec RW |
424 | ACPI_UINT32_MAX, acpi_bus_online, |
425 | NULL, NULL, NULL); | |
303bfdb1 RW |
426 | return -EBUSY; |
427 | } | |
683058e3 | 428 | } |
d22ddcbc RW |
429 | return 0; |
430 | } | |
431 | ||
432 | static int acpi_scan_hot_remove(struct acpi_device *device) | |
433 | { | |
434 | acpi_handle handle = device->handle; | |
435 | unsigned long long sta; | |
436 | acpi_status status; | |
437 | ||
dee15926 TC |
438 | if (device->handler && device->handler->hotplug.demand_offline |
439 | && !acpi_force_hot_remove) { | |
caa73ea1 | 440 | if (!acpi_scan_is_offline(device, true)) |
d22ddcbc RW |
441 | return -EBUSY; |
442 | } else { | |
443 | int error = acpi_scan_try_to_offline(device); | |
444 | if (error) | |
445 | return error; | |
446 | } | |
683058e3 | 447 | |
26d46867 | 448 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
0794469d | 449 | "Hot-removing device %s...\n", dev_name(&device->dev))); |
26d46867 | 450 | |
bfee26db | 451 | acpi_bus_trim(device); |
683058e3 | 452 | |
7d2421f8 | 453 | acpi_evaluate_lck(handle, 0); |
1da177e4 LT |
454 | /* |
455 | * TBD: _EJD support. | |
456 | */ | |
7d2421f8 JL |
457 | status = acpi_evaluate_ej0(handle); |
458 | if (status == AE_NOT_FOUND) | |
459 | return -ENODEV; | |
460 | else if (ACPI_FAILURE(status)) | |
461 | return -EIO; | |
1da177e4 | 462 | |
882fd12e TK |
463 | /* |
464 | * Verify if eject was indeed successful. If not, log an error | |
465 | * message. No need to call _OST since _EJ0 call was made OK. | |
466 | */ | |
467 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
468 | if (ACPI_FAILURE(status)) { | |
469 | acpi_handle_warn(handle, | |
470 | "Status check after eject failed (0x%x)\n", status); | |
471 | } else if (sta & ACPI_STA_DEVICE_ENABLED) { | |
472 | acpi_handle_warn(handle, | |
473 | "Eject incomplete - status 0x%llx\n", sta); | |
474 | } | |
475 | ||
a33ec399 RW |
476 | return 0; |
477 | } | |
1da177e4 | 478 | |
443fc820 RW |
479 | static int acpi_scan_device_not_present(struct acpi_device *adev) |
480 | { | |
481 | if (!acpi_device_enumerated(adev)) { | |
482 | dev_warn(&adev->dev, "Still not present\n"); | |
483 | return -EALREADY; | |
484 | } | |
485 | acpi_bus_trim(adev); | |
486 | return 0; | |
487 | } | |
488 | ||
c27b2c33 | 489 | static int acpi_scan_device_check(struct acpi_device *adev) |
a33ec399 | 490 | { |
f943db40 | 491 | int error; |
a33ec399 | 492 | |
443fc820 RW |
493 | acpi_bus_get_status(adev); |
494 | if (adev->status.present || adev->status.functional) { | |
495 | /* | |
496 | * This function is only called for device objects for which | |
497 | * matching scan handlers exist. The only situation in which | |
498 | * the scan handler is not attached to this device object yet | |
499 | * is when the device has just appeared (either it wasn't | |
500 | * present at all before or it was removed and then added | |
501 | * again). | |
502 | */ | |
503 | if (adev->handler) { | |
504 | dev_warn(&adev->dev, "Already enumerated\n"); | |
505 | return -EALREADY; | |
506 | } | |
507 | error = acpi_bus_scan(adev->handle); | |
508 | if (error) { | |
509 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
510 | return error; | |
511 | } | |
512 | if (!adev->handler) { | |
513 | dev_warn(&adev->dev, "Enumeration failure\n"); | |
514 | error = -ENODEV; | |
515 | } | |
516 | } else { | |
517 | error = acpi_scan_device_not_present(adev); | |
518 | } | |
519 | return error; | |
520 | } | |
521 | ||
522 | static int acpi_scan_bus_check(struct acpi_device *adev) | |
523 | { | |
524 | struct acpi_scan_handler *handler = adev->handler; | |
525 | struct acpi_device *child; | |
526 | int error; | |
527 | ||
528 | acpi_bus_get_status(adev); | |
529 | if (!(adev->status.present || adev->status.functional)) { | |
530 | acpi_scan_device_not_present(adev); | |
531 | return 0; | |
532 | } | |
533 | if (handler && handler->hotplug.scan_dependent) | |
534 | return handler->hotplug.scan_dependent(adev); | |
535 | ||
c27b2c33 RW |
536 | error = acpi_bus_scan(adev->handle); |
537 | if (error) { | |
538 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
539 | return error; | |
540 | } | |
443fc820 RW |
541 | list_for_each_entry(child, &adev->children, node) { |
542 | error = acpi_scan_bus_check(child); | |
543 | if (error) | |
544 | return error; | |
c27b2c33 RW |
545 | } |
546 | return 0; | |
a33ec399 RW |
547 | } |
548 | ||
3c2cc7ff RW |
549 | static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type) |
550 | { | |
551 | switch (type) { | |
552 | case ACPI_NOTIFY_BUS_CHECK: | |
553 | return acpi_scan_bus_check(adev); | |
554 | case ACPI_NOTIFY_DEVICE_CHECK: | |
555 | return acpi_scan_device_check(adev); | |
556 | case ACPI_NOTIFY_EJECT_REQUEST: | |
557 | case ACPI_OST_EC_OSPM_EJECT: | |
dd2151be RW |
558 | if (adev->handler && !adev->handler->hotplug.enabled) { |
559 | dev_info(&adev->dev, "Eject disabled\n"); | |
560 | return -EPERM; | |
561 | } | |
700b8422 RW |
562 | acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST, |
563 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); | |
3c2cc7ff RW |
564 | return acpi_scan_hot_remove(adev); |
565 | } | |
566 | return -EINVAL; | |
567 | } | |
568 | ||
1e3bcb59 | 569 | void acpi_device_hotplug(struct acpi_device *adev, u32 src) |
a33ec399 | 570 | { |
a33ec399 | 571 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
3c2cc7ff | 572 | int error = -ENODEV; |
a33ec399 | 573 | |
683058e3 | 574 | lock_device_hotplug(); |
e0ae8fee | 575 | mutex_lock(&acpi_scan_lock); |
a33ec399 | 576 | |
c27b2c33 RW |
577 | /* |
578 | * The device object's ACPI handle cannot become invalid as long as we | |
3c2cc7ff | 579 | * are holding acpi_scan_lock, but it might have become invalid before |
c27b2c33 RW |
580 | * that lock was acquired. |
581 | */ | |
582 | if (adev->handle == INVALID_ACPI_HANDLE) | |
3c2cc7ff | 583 | goto err_out; |
c27b2c33 | 584 | |
1e2380cd RW |
585 | if (adev->flags.is_dock_station) { |
586 | error = dock_notify(adev, src); | |
587 | } else if (adev->flags.hotplug_notify) { | |
3c2cc7ff | 588 | error = acpi_generic_hotplug_event(adev, src); |
dd2151be RW |
589 | if (error == -EPERM) { |
590 | ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; | |
591 | goto err_out; | |
592 | } | |
3c2cc7ff | 593 | } else { |
be27b3dc | 594 | int (*notify)(struct acpi_device *, u32); |
3c2cc7ff RW |
595 | |
596 | acpi_lock_hp_context(); | |
be27b3dc | 597 | notify = adev->hp ? adev->hp->notify : NULL; |
3c2cc7ff RW |
598 | acpi_unlock_hp_context(); |
599 | /* | |
600 | * There may be additional notify handlers for device objects | |
601 | * without the .event() callback, so ignore them here. | |
602 | */ | |
be27b3dc RW |
603 | if (notify) |
604 | error = notify(adev, src); | |
3c2cc7ff RW |
605 | else |
606 | goto out; | |
a33ec399 | 607 | } |
c27b2c33 RW |
608 | if (!error) |
609 | ost_code = ACPI_OST_SC_SUCCESS; | |
a33ec399 | 610 | |
3c2cc7ff | 611 | err_out: |
700b8422 | 612 | acpi_evaluate_ost(adev->handle, src, ost_code, NULL); |
3c2cc7ff RW |
613 | |
614 | out: | |
78ea4639 | 615 | acpi_bus_put_acpi_device(adev); |
a33ec399 | 616 | mutex_unlock(&acpi_scan_lock); |
e0ae8fee | 617 | unlock_device_hotplug(); |
a33ec399 RW |
618 | } |
619 | ||
836aedb1 RW |
620 | static ssize_t real_power_state_show(struct device *dev, |
621 | struct device_attribute *attr, char *buf) | |
622 | { | |
623 | struct acpi_device *adev = to_acpi_device(dev); | |
624 | int state; | |
625 | int ret; | |
626 | ||
627 | ret = acpi_device_get_power(adev, &state); | |
628 | if (ret) | |
629 | return ret; | |
630 | ||
631 | return sprintf(buf, "%s\n", acpi_power_state_string(state)); | |
632 | } | |
633 | ||
634 | static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL); | |
635 | ||
636 | static ssize_t power_state_show(struct device *dev, | |
637 | struct device_attribute *attr, char *buf) | |
638 | { | |
639 | struct acpi_device *adev = to_acpi_device(dev); | |
640 | ||
641 | return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state)); | |
642 | } | |
643 | ||
644 | static DEVICE_ATTR(power_state, 0444, power_state_show, NULL); | |
645 | ||
1da177e4 | 646 | static ssize_t |
f883d9db PM |
647 | acpi_eject_store(struct device *d, struct device_attribute *attr, |
648 | const char *buf, size_t count) | |
1da177e4 | 649 | { |
f883d9db | 650 | struct acpi_device *acpi_device = to_acpi_device(d); |
a33ec399 RW |
651 | acpi_object_type not_used; |
652 | acpi_status status; | |
1da177e4 | 653 | |
a33ec399 | 654 | if (!count || buf[0] != '1') |
1da177e4 | 655 | return -EINVAL; |
1da177e4 | 656 | |
a33ec399 RW |
657 | if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled) |
658 | && !acpi_device->driver) | |
659 | return -ENODEV; | |
660 | ||
661 | status = acpi_get_type(acpi_device->handle, ¬_used); | |
662 | if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable) | |
663 | return -ENODEV; | |
664 | ||
a33ec399 | 665 | get_device(&acpi_device->dev); |
1e3bcb59 | 666 | status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT); |
f943db40 RW |
667 | if (ACPI_SUCCESS(status)) |
668 | return count; | |
a33ec399 | 669 | |
f943db40 | 670 | put_device(&acpi_device->dev); |
700b8422 RW |
671 | acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, |
672 | ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); | |
5add99cf | 673 | return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN; |
1da177e4 LT |
674 | } |
675 | ||
f883d9db | 676 | static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); |
1da177e4 | 677 | |
e49bd2dd ZR |
678 | static ssize_t |
679 | acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
680 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
1da177e4 | 681 | |
ea8d82fd | 682 | return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev)); |
1da177e4 | 683 | } |
e49bd2dd | 684 | static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); |
1da177e4 | 685 | |
923d4a45 LZ |
686 | static ssize_t acpi_device_uid_show(struct device *dev, |
687 | struct device_attribute *attr, char *buf) | |
688 | { | |
689 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
690 | ||
691 | return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id); | |
692 | } | |
693 | static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL); | |
694 | ||
695 | static ssize_t acpi_device_adr_show(struct device *dev, | |
696 | struct device_attribute *attr, char *buf) | |
697 | { | |
698 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
699 | ||
700 | return sprintf(buf, "0x%08x\n", | |
701 | (unsigned int)(acpi_dev->pnp.bus_address)); | |
702 | } | |
703 | static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL); | |
704 | ||
e49bd2dd ZR |
705 | static ssize_t |
706 | acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
707 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
708 | struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; | |
709 | int result; | |
1da177e4 | 710 | |
e49bd2dd | 711 | result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); |
0c526d96 | 712 | if (result) |
e49bd2dd | 713 | goto end; |
1da177e4 | 714 | |
e49bd2dd ZR |
715 | result = sprintf(buf, "%s\n", (char*)path.pointer); |
716 | kfree(path.pointer); | |
0c526d96 | 717 | end: |
e49bd2dd | 718 | return result; |
1da177e4 | 719 | } |
e49bd2dd | 720 | static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); |
1da177e4 | 721 | |
d1efe3c3 LO |
722 | /* sysfs file that shows description text from the ACPI _STR method */ |
723 | static ssize_t description_show(struct device *dev, | |
724 | struct device_attribute *attr, | |
725 | char *buf) { | |
726 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
727 | int result; | |
728 | ||
729 | if (acpi_dev->pnp.str_obj == NULL) | |
730 | return 0; | |
731 | ||
732 | /* | |
733 | * The _STR object contains a Unicode identifier for a device. | |
734 | * We need to convert to utf-8 so it can be displayed. | |
735 | */ | |
736 | result = utf16s_to_utf8s( | |
737 | (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer, | |
738 | acpi_dev->pnp.str_obj->buffer.length, | |
739 | UTF16_LITTLE_ENDIAN, buf, | |
740 | PAGE_SIZE); | |
741 | ||
742 | buf[result++] = '\n'; | |
743 | ||
744 | return result; | |
745 | } | |
746 | static DEVICE_ATTR(description, 0444, description_show, NULL); | |
747 | ||
bb74ac23 YI |
748 | static ssize_t |
749 | acpi_device_sun_show(struct device *dev, struct device_attribute *attr, | |
750 | char *buf) { | |
751 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
a383b68d YI |
752 | acpi_status status; |
753 | unsigned long long sun; | |
bb74ac23 | 754 | |
a383b68d YI |
755 | status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun); |
756 | if (ACPI_FAILURE(status)) | |
757 | return -ENODEV; | |
758 | ||
759 | return sprintf(buf, "%llu\n", sun); | |
bb74ac23 YI |
760 | } |
761 | static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL); | |
762 | ||
c713cd7f SP |
763 | static ssize_t status_show(struct device *dev, struct device_attribute *attr, |
764 | char *buf) { | |
765 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
766 | acpi_status status; | |
767 | unsigned long long sta; | |
768 | ||
769 | status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta); | |
770 | if (ACPI_FAILURE(status)) | |
771 | return -ENODEV; | |
772 | ||
773 | return sprintf(buf, "%llu\n", sta); | |
774 | } | |
775 | static DEVICE_ATTR_RO(status); | |
776 | ||
e49bd2dd | 777 | static int acpi_device_setup_files(struct acpi_device *dev) |
1da177e4 | 778 | { |
d1efe3c3 | 779 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
f883d9db | 780 | acpi_status status; |
e49bd2dd | 781 | int result = 0; |
1da177e4 LT |
782 | |
783 | /* | |
e49bd2dd | 784 | * Devices gotten from FADT don't have a "path" attribute |
1da177e4 | 785 | */ |
0c526d96 | 786 | if (dev->handle) { |
e49bd2dd | 787 | result = device_create_file(&dev->dev, &dev_attr_path); |
0c526d96 | 788 | if (result) |
e49bd2dd | 789 | goto end; |
1da177e4 LT |
790 | } |
791 | ||
2b2ae7c7 TR |
792 | if (!list_empty(&dev->pnp.ids)) { |
793 | result = device_create_file(&dev->dev, &dev_attr_hid); | |
794 | if (result) | |
795 | goto end; | |
1da177e4 | 796 | |
2b2ae7c7 TR |
797 | result = device_create_file(&dev->dev, &dev_attr_modalias); |
798 | if (result) | |
799 | goto end; | |
800 | } | |
29b71a1c | 801 | |
d1efe3c3 LO |
802 | /* |
803 | * If device has _STR, 'description' file is created | |
804 | */ | |
952c63e9 | 805 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
806 | status = acpi_evaluate_object(dev->handle, "_STR", |
807 | NULL, &buffer); | |
808 | if (ACPI_FAILURE(status)) | |
809 | buffer.pointer = NULL; | |
810 | dev->pnp.str_obj = buffer.pointer; | |
811 | result = device_create_file(&dev->dev, &dev_attr_description); | |
812 | if (result) | |
813 | goto end; | |
814 | } | |
815 | ||
d4e1a692 | 816 | if (dev->pnp.type.bus_address) |
923d4a45 LZ |
817 | result = device_create_file(&dev->dev, &dev_attr_adr); |
818 | if (dev->pnp.unique_id) | |
819 | result = device_create_file(&dev->dev, &dev_attr_uid); | |
820 | ||
a383b68d | 821 | if (acpi_has_method(dev->handle, "_SUN")) { |
bb74ac23 YI |
822 | result = device_create_file(&dev->dev, &dev_attr_sun); |
823 | if (result) | |
824 | goto end; | |
bb74ac23 YI |
825 | } |
826 | ||
c713cd7f SP |
827 | if (acpi_has_method(dev->handle, "_STA")) { |
828 | result = device_create_file(&dev->dev, &dev_attr_status); | |
829 | if (result) | |
830 | goto end; | |
831 | } | |
832 | ||
e49bd2dd ZR |
833 | /* |
834 | * If device has _EJ0, 'eject' file is created that is used to trigger | |
835 | * hot-removal function from userland. | |
836 | */ | |
952c63e9 | 837 | if (acpi_has_method(dev->handle, "_EJ0")) { |
e49bd2dd | 838 | result = device_create_file(&dev->dev, &dev_attr_eject); |
836aedb1 RW |
839 | if (result) |
840 | return result; | |
841 | } | |
842 | ||
843 | if (dev->flags.power_manageable) { | |
844 | result = device_create_file(&dev->dev, &dev_attr_power_state); | |
845 | if (result) | |
846 | return result; | |
847 | ||
848 | if (dev->power.flags.power_resources) | |
849 | result = device_create_file(&dev->dev, | |
850 | &dev_attr_real_power_state); | |
851 | } | |
852 | ||
0c526d96 | 853 | end: |
e49bd2dd | 854 | return result; |
1da177e4 LT |
855 | } |
856 | ||
f883d9db | 857 | static void acpi_device_remove_files(struct acpi_device *dev) |
1da177e4 | 858 | { |
836aedb1 RW |
859 | if (dev->flags.power_manageable) { |
860 | device_remove_file(&dev->dev, &dev_attr_power_state); | |
861 | if (dev->power.flags.power_resources) | |
862 | device_remove_file(&dev->dev, | |
863 | &dev_attr_real_power_state); | |
864 | } | |
865 | ||
f883d9db | 866 | /* |
d1efe3c3 LO |
867 | * If device has _STR, remove 'description' file |
868 | */ | |
952c63e9 | 869 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
870 | kfree(dev->pnp.str_obj); |
871 | device_remove_file(&dev->dev, &dev_attr_description); | |
872 | } | |
873 | /* | |
874 | * If device has _EJ0, remove 'eject' file. | |
f883d9db | 875 | */ |
952c63e9 | 876 | if (acpi_has_method(dev->handle, "_EJ0")) |
f883d9db | 877 | device_remove_file(&dev->dev, &dev_attr_eject); |
1da177e4 | 878 | |
952c63e9 | 879 | if (acpi_has_method(dev->handle, "_SUN")) |
bb74ac23 YI |
880 | device_remove_file(&dev->dev, &dev_attr_sun); |
881 | ||
923d4a45 LZ |
882 | if (dev->pnp.unique_id) |
883 | device_remove_file(&dev->dev, &dev_attr_uid); | |
d4e1a692 | 884 | if (dev->pnp.type.bus_address) |
923d4a45 | 885 | device_remove_file(&dev->dev, &dev_attr_adr); |
1131b938 BH |
886 | device_remove_file(&dev->dev, &dev_attr_modalias); |
887 | device_remove_file(&dev->dev, &dev_attr_hid); | |
c713cd7f SP |
888 | if (acpi_has_method(dev->handle, "_STA")) |
889 | device_remove_file(&dev->dev, &dev_attr_status); | |
0c526d96 | 890 | if (dev->handle) |
e49bd2dd | 891 | device_remove_file(&dev->dev, &dev_attr_path); |
1da177e4 | 892 | } |
1da177e4 | 893 | /* -------------------------------------------------------------------------- |
9e89dde2 | 894 | ACPI Bus operations |
1da177e4 | 895 | -------------------------------------------------------------------------- */ |
29b71a1c | 896 | |
cf761af9 MW |
897 | static const struct acpi_device_id *__acpi_match_device( |
898 | struct acpi_device *device, const struct acpi_device_id *ids) | |
29b71a1c TR |
899 | { |
900 | const struct acpi_device_id *id; | |
7f47fa6c | 901 | struct acpi_hardware_id *hwid; |
29b71a1c | 902 | |
39a0ad87 ZY |
903 | /* |
904 | * If the device is not present, it is unnecessary to load device | |
905 | * driver for it. | |
906 | */ | |
907 | if (!device->status.present) | |
cf761af9 | 908 | return NULL; |
39a0ad87 | 909 | |
7f47fa6c BH |
910 | for (id = ids; id->id[0]; id++) |
911 | list_for_each_entry(hwid, &device->pnp.ids, list) | |
912 | if (!strcmp((char *) id->id, hwid->id)) | |
cf761af9 MW |
913 | return id; |
914 | ||
915 | return NULL; | |
916 | } | |
917 | ||
918 | /** | |
919 | * acpi_match_device - Match a struct device against a given list of ACPI IDs | |
920 | * @ids: Array of struct acpi_device_id object to match against. | |
921 | * @dev: The device structure to match. | |
922 | * | |
923 | * Check if @dev has a valid ACPI handle and if there is a struct acpi_device | |
924 | * object for that handle and use that object to match against a given list of | |
925 | * device IDs. | |
926 | * | |
927 | * Return a pointer to the first matching ID on success or %NULL on failure. | |
928 | */ | |
929 | const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, | |
930 | const struct device *dev) | |
931 | { | |
932 | struct acpi_device *adev; | |
0613e1f7 | 933 | acpi_handle handle = ACPI_HANDLE(dev); |
cf761af9 | 934 | |
0613e1f7 | 935 | if (!ids || !handle || acpi_bus_get_device(handle, &adev)) |
cf761af9 MW |
936 | return NULL; |
937 | ||
52870786 MW |
938 | if (!acpi_companion_match(dev)) |
939 | return NULL; | |
940 | ||
cf761af9 MW |
941 | return __acpi_match_device(adev, ids); |
942 | } | |
943 | EXPORT_SYMBOL_GPL(acpi_match_device); | |
29b71a1c | 944 | |
cf761af9 MW |
945 | int acpi_match_device_ids(struct acpi_device *device, |
946 | const struct acpi_device_id *ids) | |
947 | { | |
948 | return __acpi_match_device(device, ids) ? 0 : -ENOENT; | |
29b71a1c TR |
949 | } |
950 | EXPORT_SYMBOL(acpi_match_device_ids); | |
951 | ||
54fe9ce3 RW |
952 | /** |
953 | * acpi_of_match_device - Match device using the "compatible" property. | |
954 | * @dev: Device to match. | |
955 | * @of_match_table: List of device IDs to match against. | |
956 | * | |
957 | * If @dev has an ACPI companion which has the special PRP0001 device ID in its | |
958 | * list of identifiers and a _DSD object with the "compatible" property, use | |
959 | * that property to match against the given list of identifiers. | |
960 | */ | |
961 | static bool acpi_of_match_device(struct device *dev, | |
962 | const struct of_device_id *of_match_table) | |
733e6251 MW |
963 | { |
964 | const union acpi_object *of_compatible, *obj; | |
965 | struct acpi_device *adev; | |
966 | int i, nval; | |
967 | ||
968 | adev = ACPI_COMPANION(dev); | |
969 | if (!adev) | |
970 | return false; | |
971 | ||
972 | of_compatible = adev->data.of_compatible; | |
54fe9ce3 | 973 | if (!of_match_table || !of_compatible) |
733e6251 MW |
974 | return false; |
975 | ||
976 | if (of_compatible->type == ACPI_TYPE_PACKAGE) { | |
977 | nval = of_compatible->package.count; | |
978 | obj = of_compatible->package.elements; | |
979 | } else { /* Must be ACPI_TYPE_STRING. */ | |
980 | nval = 1; | |
981 | obj = of_compatible; | |
982 | } | |
983 | /* Now we can look for the driver DT compatible strings */ | |
984 | for (i = 0; i < nval; i++, obj++) { | |
985 | const struct of_device_id *id; | |
986 | ||
54fe9ce3 | 987 | for (id = of_match_table; id->compatible[0]; id++) |
733e6251 MW |
988 | if (!strcasecmp(obj->string.pointer, id->compatible)) |
989 | return true; | |
990 | } | |
991 | ||
992 | return false; | |
993 | } | |
994 | ||
995 | bool acpi_driver_match_device(struct device *dev, | |
996 | const struct device_driver *drv) | |
997 | { | |
998 | if (!drv->acpi_match_table) | |
54fe9ce3 | 999 | return acpi_of_match_device(dev, drv->of_match_table); |
733e6251 MW |
1000 | |
1001 | return !!acpi_match_device(drv->acpi_match_table, dev); | |
1002 | } | |
1003 | EXPORT_SYMBOL_GPL(acpi_driver_match_device); | |
1004 | ||
0b224527 RW |
1005 | static void acpi_free_power_resources_lists(struct acpi_device *device) |
1006 | { | |
1007 | int i; | |
1008 | ||
993cbe59 RW |
1009 | if (device->wakeup.flags.valid) |
1010 | acpi_power_resources_list_free(&device->wakeup.resources); | |
1011 | ||
1b1f3e16 | 1012 | if (!device->power.flags.power_resources) |
0b224527 RW |
1013 | return; |
1014 | ||
1015 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { | |
1016 | struct acpi_device_power_state *ps = &device->power.states[i]; | |
1017 | acpi_power_resources_list_free(&ps->resources); | |
1018 | } | |
7f47fa6c BH |
1019 | } |
1020 | ||
1890a97a | 1021 | static void acpi_device_release(struct device *dev) |
1da177e4 | 1022 | { |
1890a97a | 1023 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1da177e4 | 1024 | |
ffdcd955 | 1025 | acpi_free_properties(acpi_dev); |
c0af4175 | 1026 | acpi_free_pnp_ids(&acpi_dev->pnp); |
0b224527 | 1027 | acpi_free_power_resources_lists(acpi_dev); |
1890a97a | 1028 | kfree(acpi_dev); |
1da177e4 LT |
1029 | } |
1030 | ||
5d9464a4 | 1031 | static int acpi_bus_match(struct device *dev, struct device_driver *drv) |
9e89dde2 | 1032 | { |
5d9464a4 PM |
1033 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1034 | struct acpi_driver *acpi_drv = to_acpi_driver(drv); | |
1da177e4 | 1035 | |
209d3b17 | 1036 | return acpi_dev->flags.match_driver |
805d410f | 1037 | && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); |
5d9464a4 | 1038 | } |
1da177e4 | 1039 | |
7eff2e7a | 1040 | static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 | 1041 | { |
5d9464a4 | 1042 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
7eff2e7a | 1043 | int len; |
5d9464a4 | 1044 | |
2b2ae7c7 TR |
1045 | if (list_empty(&acpi_dev->pnp.ids)) |
1046 | return 0; | |
1047 | ||
7eff2e7a KS |
1048 | if (add_uevent_var(env, "MODALIAS=")) |
1049 | return -ENOMEM; | |
1050 | len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], | |
1051 | sizeof(env->buf) - env->buflen); | |
3d8e0090 ZR |
1052 | if (len <= 0) |
1053 | return len; | |
7eff2e7a | 1054 | env->buflen += len; |
9e89dde2 | 1055 | return 0; |
1da177e4 LT |
1056 | } |
1057 | ||
46ec8598 BH |
1058 | static void acpi_device_notify(acpi_handle handle, u32 event, void *data) |
1059 | { | |
1060 | struct acpi_device *device = data; | |
1061 | ||
1062 | device->driver->ops.notify(device, event); | |
1063 | } | |
1064 | ||
236105db | 1065 | static void acpi_device_notify_fixed(void *data) |
46ec8598 BH |
1066 | { |
1067 | struct acpi_device *device = data; | |
1068 | ||
53de5356 BH |
1069 | /* Fixed hardware devices have no handles */ |
1070 | acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); | |
236105db LT |
1071 | } |
1072 | ||
fd9caef4 | 1073 | static u32 acpi_device_fixed_event(void *data) |
236105db LT |
1074 | { |
1075 | acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data); | |
fd9caef4 | 1076 | return ACPI_INTERRUPT_HANDLED; |
46ec8598 BH |
1077 | } |
1078 | ||
1079 | static int acpi_device_install_notify_handler(struct acpi_device *device) | |
1080 | { | |
1081 | acpi_status status; | |
46ec8598 | 1082 | |
ccba2a36 | 1083 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 BH |
1084 | status = |
1085 | acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, | |
236105db | 1086 | acpi_device_fixed_event, |
46ec8598 | 1087 | device); |
ccba2a36 | 1088 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 BH |
1089 | status = |
1090 | acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, | |
236105db | 1091 | acpi_device_fixed_event, |
46ec8598 BH |
1092 | device); |
1093 | else | |
1094 | status = acpi_install_notify_handler(device->handle, | |
1095 | ACPI_DEVICE_NOTIFY, | |
1096 | acpi_device_notify, | |
1097 | device); | |
1098 | ||
1099 | if (ACPI_FAILURE(status)) | |
1100 | return -EINVAL; | |
1101 | return 0; | |
1102 | } | |
1103 | ||
1104 | static void acpi_device_remove_notify_handler(struct acpi_device *device) | |
1105 | { | |
ccba2a36 | 1106 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 | 1107 | acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
236105db | 1108 | acpi_device_fixed_event); |
ccba2a36 | 1109 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 | 1110 | acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, |
236105db | 1111 | acpi_device_fixed_event); |
46ec8598 BH |
1112 | else |
1113 | acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, | |
1114 | acpi_device_notify); | |
1115 | } | |
1116 | ||
d9e455f5 | 1117 | static int acpi_device_probe(struct device *dev) |
1da177e4 | 1118 | { |
5d9464a4 PM |
1119 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1120 | struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); | |
1121 | int ret; | |
1122 | ||
fc2e0a83 | 1123 | if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) |
24071f47 RW |
1124 | return -EINVAL; |
1125 | ||
d9e455f5 RW |
1126 | if (!acpi_drv->ops.add) |
1127 | return -ENOSYS; | |
46ec8598 | 1128 | |
d9e455f5 RW |
1129 | ret = acpi_drv->ops.add(acpi_dev); |
1130 | if (ret) | |
1131 | return ret; | |
46ec8598 | 1132 | |
d9e455f5 RW |
1133 | acpi_dev->driver = acpi_drv; |
1134 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
1135 | "Driver [%s] successfully bound to device [%s]\n", | |
1136 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
1137 | ||
1138 | if (acpi_drv->ops.notify) { | |
1139 | ret = acpi_device_install_notify_handler(acpi_dev); | |
1140 | if (ret) { | |
1141 | if (acpi_drv->ops.remove) | |
1142 | acpi_drv->ops.remove(acpi_dev); | |
1143 | ||
1144 | acpi_dev->driver = NULL; | |
1145 | acpi_dev->driver_data = NULL; | |
1146 | return ret; | |
1147 | } | |
5d9464a4 | 1148 | } |
d9e455f5 RW |
1149 | |
1150 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", | |
1151 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
1152 | get_device(dev); | |
1153 | return 0; | |
5d9464a4 | 1154 | } |
1da177e4 | 1155 | |
5d9464a4 PM |
1156 | static int acpi_device_remove(struct device * dev) |
1157 | { | |
1158 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
1159 | struct acpi_driver *acpi_drv = acpi_dev->driver; | |
1160 | ||
1161 | if (acpi_drv) { | |
46ec8598 BH |
1162 | if (acpi_drv->ops.notify) |
1163 | acpi_device_remove_notify_handler(acpi_dev); | |
5d9464a4 | 1164 | if (acpi_drv->ops.remove) |
51fac838 | 1165 | acpi_drv->ops.remove(acpi_dev); |
1da177e4 | 1166 | } |
5d9464a4 | 1167 | acpi_dev->driver = NULL; |
db89b4f0 | 1168 | acpi_dev->driver_data = NULL; |
1da177e4 | 1169 | |
5d9464a4 | 1170 | put_device(dev); |
9e89dde2 ZR |
1171 | return 0; |
1172 | } | |
1da177e4 | 1173 | |
55955aad | 1174 | struct bus_type acpi_bus_type = { |
9e89dde2 | 1175 | .name = "acpi", |
5d9464a4 PM |
1176 | .match = acpi_bus_match, |
1177 | .probe = acpi_device_probe, | |
1178 | .remove = acpi_device_remove, | |
1179 | .uevent = acpi_device_uevent, | |
9e89dde2 ZR |
1180 | }; |
1181 | ||
d783156e RW |
1182 | static void acpi_device_del(struct acpi_device *device) |
1183 | { | |
1184 | mutex_lock(&acpi_device_lock); | |
1185 | if (device->parent) | |
1186 | list_del(&device->node); | |
1187 | ||
1188 | list_del(&device->wakeup_list); | |
1189 | mutex_unlock(&acpi_device_lock); | |
1190 | ||
1191 | acpi_power_add_remove_device(device, false); | |
1192 | acpi_device_remove_files(device); | |
1193 | if (device->remove) | |
1194 | device->remove(device); | |
1195 | ||
1196 | device_del(&device->dev); | |
1197 | } | |
1198 | ||
1199 | static LIST_HEAD(acpi_device_del_list); | |
1200 | static DEFINE_MUTEX(acpi_device_del_lock); | |
1201 | ||
1202 | static void acpi_device_del_work_fn(struct work_struct *work_not_used) | |
1203 | { | |
1204 | for (;;) { | |
1205 | struct acpi_device *adev; | |
1206 | ||
1207 | mutex_lock(&acpi_device_del_lock); | |
1208 | ||
1209 | if (list_empty(&acpi_device_del_list)) { | |
1210 | mutex_unlock(&acpi_device_del_lock); | |
1211 | break; | |
1212 | } | |
1213 | adev = list_first_entry(&acpi_device_del_list, | |
1214 | struct acpi_device, del_list); | |
1215 | list_del(&adev->del_list); | |
1216 | ||
1217 | mutex_unlock(&acpi_device_del_lock); | |
1218 | ||
1219 | acpi_device_del(adev); | |
1220 | /* | |
1221 | * Drop references to all power resources that might have been | |
1222 | * used by the device. | |
1223 | */ | |
1224 | acpi_power_transition(adev, ACPI_STATE_D3_COLD); | |
1225 | put_device(&adev->dev); | |
1226 | } | |
1227 | } | |
1228 | ||
1229 | /** | |
1230 | * acpi_scan_drop_device - Drop an ACPI device object. | |
1231 | * @handle: Handle of an ACPI namespace node, not used. | |
1232 | * @context: Address of the ACPI device object to drop. | |
1233 | * | |
1234 | * This is invoked by acpi_ns_delete_node() during the removal of the ACPI | |
1235 | * namespace node the device object pointed to by @context is attached to. | |
1236 | * | |
1237 | * The unregistration is carried out asynchronously to avoid running | |
1238 | * acpi_device_del() under the ACPICA's namespace mutex and the list is used to | |
1239 | * ensure the correct ordering (the device objects must be unregistered in the | |
1240 | * same order in which the corresponding namespace nodes are deleted). | |
1241 | */ | |
1242 | static void acpi_scan_drop_device(acpi_handle handle, void *context) | |
caf5c03f | 1243 | { |
d783156e RW |
1244 | static DECLARE_WORK(work, acpi_device_del_work_fn); |
1245 | struct acpi_device *adev = context; | |
1246 | ||
1247 | mutex_lock(&acpi_device_del_lock); | |
1248 | ||
1249 | /* | |
1250 | * Use the ACPI hotplug workqueue which is ordered, so this work item | |
1251 | * won't run after any hotplug work items submitted subsequently. That | |
1252 | * prevents attempts to register device objects identical to those being | |
1253 | * deleted from happening concurrently (such attempts result from | |
1254 | * hotplug events handled via the ACPI hotplug workqueue). It also will | |
1255 | * run after all of the work items submitted previosuly, which helps | |
1256 | * those work items to ensure that they are not accessing stale device | |
1257 | * objects. | |
1258 | */ | |
1259 | if (list_empty(&acpi_device_del_list)) | |
1260 | acpi_queue_hotplug_work(&work); | |
1261 | ||
1262 | list_add_tail(&adev->del_list, &acpi_device_del_list); | |
1263 | /* Make acpi_ns_validate_handle() return NULL for this handle. */ | |
1264 | adev->handle = INVALID_ACPI_HANDLE; | |
1265 | ||
1266 | mutex_unlock(&acpi_device_del_lock); | |
caf5c03f RW |
1267 | } |
1268 | ||
78ea4639 RW |
1269 | static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device, |
1270 | void (*callback)(void *)) | |
caf5c03f RW |
1271 | { |
1272 | acpi_status status; | |
1273 | ||
1274 | if (!device) | |
1275 | return -EINVAL; | |
1276 | ||
78ea4639 RW |
1277 | status = acpi_get_data_full(handle, acpi_scan_drop_device, |
1278 | (void **)device, callback); | |
caf5c03f RW |
1279 | if (ACPI_FAILURE(status) || !*device) { |
1280 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", | |
1281 | handle)); | |
1282 | return -ENODEV; | |
1283 | } | |
1284 | return 0; | |
1285 | } | |
78ea4639 RW |
1286 | |
1287 | int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) | |
1288 | { | |
1289 | return acpi_get_device_data(handle, device, NULL); | |
1290 | } | |
6585925b | 1291 | EXPORT_SYMBOL(acpi_bus_get_device); |
caf5c03f | 1292 | |
78ea4639 RW |
1293 | static void get_acpi_device(void *dev) |
1294 | { | |
1295 | if (dev) | |
1296 | get_device(&((struct acpi_device *)dev)->dev); | |
1297 | } | |
1298 | ||
1299 | struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle) | |
1300 | { | |
1301 | struct acpi_device *adev = NULL; | |
1302 | ||
1303 | acpi_get_device_data(handle, &adev, get_acpi_device); | |
1304 | return adev; | |
1305 | } | |
1306 | ||
1307 | void acpi_bus_put_acpi_device(struct acpi_device *adev) | |
1308 | { | |
1309 | put_device(&adev->dev); | |
1310 | } | |
1311 | ||
cf860be6 RW |
1312 | int acpi_device_add(struct acpi_device *device, |
1313 | void (*release)(struct device *)) | |
1da177e4 | 1314 | { |
4be44fcd | 1315 | int result; |
e49bd2dd ZR |
1316 | struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; |
1317 | int found = 0; | |
66b7ed40 | 1318 | |
d43e167d RW |
1319 | if (device->handle) { |
1320 | acpi_status status; | |
1321 | ||
d783156e | 1322 | status = acpi_attach_data(device->handle, acpi_scan_drop_device, |
d43e167d RW |
1323 | device); |
1324 | if (ACPI_FAILURE(status)) { | |
1325 | acpi_handle_err(device->handle, | |
1326 | "Unable to attach device data\n"); | |
1327 | return -ENODEV; | |
1328 | } | |
1329 | } | |
1330 | ||
9e89dde2 ZR |
1331 | /* |
1332 | * Linkage | |
1333 | * ------- | |
1334 | * Link this device to its parent and siblings. | |
1335 | */ | |
1336 | INIT_LIST_HEAD(&device->children); | |
1337 | INIT_LIST_HEAD(&device->node); | |
9e89dde2 | 1338 | INIT_LIST_HEAD(&device->wakeup_list); |
1033f904 | 1339 | INIT_LIST_HEAD(&device->physical_node_list); |
d783156e | 1340 | INIT_LIST_HEAD(&device->del_list); |
1033f904 | 1341 | mutex_init(&device->physical_node_lock); |
1da177e4 | 1342 | |
e49bd2dd ZR |
1343 | new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); |
1344 | if (!new_bus_id) { | |
d43e167d RW |
1345 | pr_err(PREFIX "Memory allocation error\n"); |
1346 | result = -ENOMEM; | |
1347 | goto err_detach; | |
1da177e4 | 1348 | } |
e49bd2dd | 1349 | |
9090589d | 1350 | mutex_lock(&acpi_device_lock); |
e49bd2dd ZR |
1351 | /* |
1352 | * Find suitable bus_id and instance number in acpi_bus_id_list | |
1353 | * If failed, create one and link it into acpi_bus_id_list | |
1354 | */ | |
1355 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { | |
1131b938 BH |
1356 | if (!strcmp(acpi_device_bus_id->bus_id, |
1357 | acpi_device_hid(device))) { | |
1358 | acpi_device_bus_id->instance_no++; | |
e49bd2dd ZR |
1359 | found = 1; |
1360 | kfree(new_bus_id); | |
1361 | break; | |
1362 | } | |
1da177e4 | 1363 | } |
0c526d96 | 1364 | if (!found) { |
e49bd2dd | 1365 | acpi_device_bus_id = new_bus_id; |
1131b938 | 1366 | strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); |
e49bd2dd ZR |
1367 | acpi_device_bus_id->instance_no = 0; |
1368 | list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); | |
1da177e4 | 1369 | } |
0794469d | 1370 | dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); |
1da177e4 | 1371 | |
33b57150 | 1372 | if (device->parent) |
9e89dde2 | 1373 | list_add_tail(&device->node, &device->parent->children); |
33b57150 | 1374 | |
9e89dde2 ZR |
1375 | if (device->wakeup.flags.valid) |
1376 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); | |
9090589d | 1377 | mutex_unlock(&acpi_device_lock); |
1da177e4 | 1378 | |
1890a97a | 1379 | if (device->parent) |
66b7ed40 | 1380 | device->dev.parent = &device->parent->dev; |
1890a97a | 1381 | device->dev.bus = &acpi_bus_type; |
82c7d5ef | 1382 | device->dev.release = release; |
cf860be6 | 1383 | result = device_add(&device->dev); |
0c526d96 | 1384 | if (result) { |
8b12b922 | 1385 | dev_err(&device->dev, "Error registering device\n"); |
d43e167d | 1386 | goto err; |
1da177e4 | 1387 | } |
1da177e4 | 1388 | |
e49bd2dd | 1389 | result = acpi_device_setup_files(device); |
0c526d96 | 1390 | if (result) |
0794469d KS |
1391 | printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", |
1392 | dev_name(&device->dev)); | |
1da177e4 | 1393 | |
1da177e4 | 1394 | return 0; |
d43e167d RW |
1395 | |
1396 | err: | |
9090589d | 1397 | mutex_lock(&acpi_device_lock); |
33b57150 | 1398 | if (device->parent) |
e49bd2dd | 1399 | list_del(&device->node); |
e49bd2dd | 1400 | list_del(&device->wakeup_list); |
9090589d | 1401 | mutex_unlock(&acpi_device_lock); |
d43e167d RW |
1402 | |
1403 | err_detach: | |
d783156e | 1404 | acpi_detach_data(device->handle, acpi_scan_drop_device); |
e49bd2dd | 1405 | return result; |
1da177e4 LT |
1406 | } |
1407 | ||
8a0662d9 RW |
1408 | struct acpi_device *acpi_get_next_child(struct device *dev, |
1409 | struct acpi_device *child) | |
1410 | { | |
1411 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
1412 | struct list_head *head, *next; | |
1413 | ||
1414 | if (!adev) | |
1415 | return NULL; | |
1416 | ||
1417 | head = &adev->children; | |
1418 | if (list_empty(head)) | |
1419 | return NULL; | |
1420 | ||
1421 | if (!child) | |
1422 | return list_first_entry(head, struct acpi_device, node); | |
1423 | ||
1424 | next = child->node.next; | |
1425 | return next == head ? NULL : list_entry(next, struct acpi_device, node); | |
1426 | } | |
1427 | ||
9e89dde2 ZR |
1428 | /* -------------------------------------------------------------------------- |
1429 | Driver Management | |
1430 | -------------------------------------------------------------------------- */ | |
9e89dde2 ZR |
1431 | /** |
1432 | * acpi_bus_register_driver - register a driver with the ACPI bus | |
1433 | * @driver: driver being registered | |
1434 | * | |
1435 | * Registers a driver with the ACPI bus. Searches the namespace for all | |
1436 | * devices that match the driver's criteria and binds. Returns zero for | |
1437 | * success or a negative error status for failure. | |
1438 | */ | |
1439 | int acpi_bus_register_driver(struct acpi_driver *driver) | |
1da177e4 | 1440 | { |
1890a97a | 1441 | int ret; |
1da177e4 | 1442 | |
9e89dde2 ZR |
1443 | if (acpi_disabled) |
1444 | return -ENODEV; | |
1890a97a PM |
1445 | driver->drv.name = driver->name; |
1446 | driver->drv.bus = &acpi_bus_type; | |
1447 | driver->drv.owner = driver->owner; | |
1da177e4 | 1448 | |
1890a97a PM |
1449 | ret = driver_register(&driver->drv); |
1450 | return ret; | |
9e89dde2 | 1451 | } |
1da177e4 | 1452 | |
9e89dde2 ZR |
1453 | EXPORT_SYMBOL(acpi_bus_register_driver); |
1454 | ||
1455 | /** | |
b27b14ce | 1456 | * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus |
9e89dde2 ZR |
1457 | * @driver: driver to unregister |
1458 | * | |
1459 | * Unregisters a driver with the ACPI bus. Searches the namespace for all | |
1460 | * devices that match the driver's criteria and unbinds. | |
1461 | */ | |
1462 | void acpi_bus_unregister_driver(struct acpi_driver *driver) | |
1463 | { | |
1890a97a | 1464 | driver_unregister(&driver->drv); |
9e89dde2 ZR |
1465 | } |
1466 | ||
1467 | EXPORT_SYMBOL(acpi_bus_unregister_driver); | |
1468 | ||
9e89dde2 ZR |
1469 | /* -------------------------------------------------------------------------- |
1470 | Device Enumeration | |
1471 | -------------------------------------------------------------------------- */ | |
5c478f49 BH |
1472 | static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) |
1473 | { | |
456de893 | 1474 | struct acpi_device *device = NULL; |
5c478f49 | 1475 | acpi_status status; |
5c478f49 BH |
1476 | |
1477 | /* | |
1478 | * Fixed hardware devices do not appear in the namespace and do not | |
1479 | * have handles, but we fabricate acpi_devices for them, so we have | |
1480 | * to deal with them specially. | |
1481 | */ | |
456de893 | 1482 | if (!handle) |
5c478f49 BH |
1483 | return acpi_root; |
1484 | ||
1485 | do { | |
1486 | status = acpi_get_parent(handle, &handle); | |
5c478f49 | 1487 | if (ACPI_FAILURE(status)) |
456de893 RW |
1488 | return status == AE_NULL_ENTRY ? NULL : acpi_root; |
1489 | } while (acpi_bus_get_device(handle, &device)); | |
1490 | return device; | |
5c478f49 BH |
1491 | } |
1492 | ||
9e89dde2 ZR |
1493 | acpi_status |
1494 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) | |
1495 | { | |
1496 | acpi_status status; | |
1497 | acpi_handle tmp; | |
1498 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
1499 | union acpi_object *obj; | |
1500 | ||
1501 | status = acpi_get_handle(handle, "_EJD", &tmp); | |
1502 | if (ACPI_FAILURE(status)) | |
1503 | return status; | |
1504 | ||
1505 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); | |
1506 | if (ACPI_SUCCESS(status)) { | |
1507 | obj = buffer.pointer; | |
3b5fee59 HM |
1508 | status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, |
1509 | ejd); | |
9e89dde2 ZR |
1510 | kfree(buffer.pointer); |
1511 | } | |
1512 | return status; | |
1513 | } | |
1514 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); | |
1515 | ||
e88c9c60 RW |
1516 | static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle, |
1517 | struct acpi_device_wakeup *wakeup) | |
9e89dde2 | 1518 | { |
b581a7f9 RW |
1519 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1520 | union acpi_object *package = NULL; | |
9e89dde2 | 1521 | union acpi_object *element = NULL; |
b581a7f9 | 1522 | acpi_status status; |
e88c9c60 | 1523 | int err = -ENODATA; |
9e89dde2 | 1524 | |
b581a7f9 | 1525 | if (!wakeup) |
e88c9c60 | 1526 | return -EINVAL; |
9e89dde2 | 1527 | |
993cbe59 | 1528 | INIT_LIST_HEAD(&wakeup->resources); |
9e89dde2 | 1529 | |
b581a7f9 RW |
1530 | /* _PRW */ |
1531 | status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); | |
1532 | if (ACPI_FAILURE(status)) { | |
1533 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); | |
e88c9c60 | 1534 | return err; |
b581a7f9 RW |
1535 | } |
1536 | ||
1537 | package = (union acpi_object *)buffer.pointer; | |
1538 | ||
e88c9c60 | 1539 | if (!package || package->package.count < 2) |
b581a7f9 | 1540 | goto out; |
b581a7f9 | 1541 | |
9e89dde2 | 1542 | element = &(package->package.elements[0]); |
e88c9c60 | 1543 | if (!element) |
b581a7f9 | 1544 | goto out; |
e88c9c60 | 1545 | |
9e89dde2 ZR |
1546 | if (element->type == ACPI_TYPE_PACKAGE) { |
1547 | if ((element->package.count < 2) || | |
1548 | (element->package.elements[0].type != | |
1549 | ACPI_TYPE_LOCAL_REFERENCE) | |
e88c9c60 | 1550 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
b581a7f9 | 1551 | goto out; |
e88c9c60 | 1552 | |
b581a7f9 | 1553 | wakeup->gpe_device = |
9e89dde2 | 1554 | element->package.elements[0].reference.handle; |
b581a7f9 | 1555 | wakeup->gpe_number = |
9e89dde2 ZR |
1556 | (u32) element->package.elements[1].integer.value; |
1557 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
b581a7f9 RW |
1558 | wakeup->gpe_device = NULL; |
1559 | wakeup->gpe_number = element->integer.value; | |
1560 | } else { | |
b581a7f9 RW |
1561 | goto out; |
1562 | } | |
9e89dde2 ZR |
1563 | |
1564 | element = &(package->package.elements[1]); | |
e88c9c60 | 1565 | if (element->type != ACPI_TYPE_INTEGER) |
b581a7f9 | 1566 | goto out; |
e88c9c60 | 1567 | |
b581a7f9 | 1568 | wakeup->sleep_state = element->integer.value; |
9e89dde2 | 1569 | |
e88c9c60 RW |
1570 | err = acpi_extract_power_resources(package, 2, &wakeup->resources); |
1571 | if (err) | |
b581a7f9 | 1572 | goto out; |
9e89dde2 | 1573 | |
0596a52b RW |
1574 | if (!list_empty(&wakeup->resources)) { |
1575 | int sleep_state; | |
9e89dde2 | 1576 | |
b5d667eb RW |
1577 | err = acpi_power_wakeup_list_init(&wakeup->resources, |
1578 | &sleep_state); | |
1579 | if (err) { | |
1580 | acpi_handle_warn(handle, "Retrieving current states " | |
1581 | "of wakeup power resources failed\n"); | |
1582 | acpi_power_resources_list_free(&wakeup->resources); | |
1583 | goto out; | |
1584 | } | |
0596a52b RW |
1585 | if (sleep_state < wakeup->sleep_state) { |
1586 | acpi_handle_warn(handle, "Overriding _PRW sleep state " | |
1587 | "(S%d) by S%d from power resources\n", | |
1588 | (int)wakeup->sleep_state, sleep_state); | |
1589 | wakeup->sleep_state = sleep_state; | |
1590 | } | |
1591 | } | |
9874647b | 1592 | |
b581a7f9 RW |
1593 | out: |
1594 | kfree(buffer.pointer); | |
e88c9c60 | 1595 | return err; |
1da177e4 LT |
1596 | } |
1597 | ||
bd9b2f9a | 1598 | static void acpi_wakeup_gpe_init(struct acpi_device *device) |
1da177e4 | 1599 | { |
29b71a1c | 1600 | struct acpi_device_id button_device_ids[] = { |
29b71a1c | 1601 | {"PNP0C0C", 0}, |
b7e38304 | 1602 | {"PNP0C0D", 0}, |
29b71a1c TR |
1603 | {"PNP0C0E", 0}, |
1604 | {"", 0}, | |
1605 | }; | |
bd9b2f9a | 1606 | struct acpi_device_wakeup *wakeup = &device->wakeup; |
f517709d RW |
1607 | acpi_status status; |
1608 | acpi_event_status event_status; | |
1609 | ||
bd9b2f9a | 1610 | wakeup->flags.notifier_present = 0; |
f517709d RW |
1611 | |
1612 | /* Power button, Lid switch always enable wakeup */ | |
1613 | if (!acpi_match_device_ids(device, button_device_ids)) { | |
bd9b2f9a | 1614 | wakeup->flags.run_wake = 1; |
b7e38304 ZR |
1615 | if (!acpi_match_device_ids(device, &button_device_ids[1])) { |
1616 | /* Do not use Lid/sleep button for S5 wakeup */ | |
bd9b2f9a RW |
1617 | if (wakeup->sleep_state == ACPI_STATE_S5) |
1618 | wakeup->sleep_state = ACPI_STATE_S4; | |
b7e38304 | 1619 | } |
bd9b2f9a | 1620 | acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number); |
f2b56bc8 | 1621 | device_set_wakeup_capable(&device->dev, true); |
f517709d RW |
1622 | return; |
1623 | } | |
1624 | ||
bd9b2f9a RW |
1625 | acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device, |
1626 | wakeup->gpe_number); | |
1627 | status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number, | |
1628 | &event_status); | |
1629 | if (ACPI_FAILURE(status)) | |
1630 | return; | |
1631 | ||
2f857234 | 1632 | wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER); |
f517709d RW |
1633 | } |
1634 | ||
d57d09a4 | 1635 | static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
f517709d | 1636 | { |
e88c9c60 | 1637 | int err; |
29b71a1c | 1638 | |
d57d09a4 | 1639 | /* Presence of _PRW indicates wake capable */ |
952c63e9 | 1640 | if (!acpi_has_method(device->handle, "_PRW")) |
d57d09a4 RW |
1641 | return; |
1642 | ||
e88c9c60 RW |
1643 | err = acpi_bus_extract_wakeup_device_power_package(device->handle, |
1644 | &device->wakeup); | |
1645 | if (err) { | |
1646 | dev_err(&device->dev, "_PRW evaluation error: %d\n", err); | |
d57d09a4 | 1647 | return; |
9e89dde2 | 1648 | } |
1da177e4 | 1649 | |
9e89dde2 | 1650 | device->wakeup.flags.valid = 1; |
9b83ccd2 | 1651 | device->wakeup.prepare_count = 0; |
bd9b2f9a | 1652 | acpi_wakeup_gpe_init(device); |
729b2bdb ZY |
1653 | /* Call _PSW/_DSW object to disable its ability to wake the sleeping |
1654 | * system for the ACPI device with the _PRW object. | |
1655 | * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. | |
1656 | * So it is necessary to call _DSW object first. Only when it is not | |
1657 | * present will the _PSW object used. | |
1658 | */ | |
e88c9c60 RW |
1659 | err = acpi_device_sleep_wake(device, 0, 0, 0); |
1660 | if (err) | |
77e76609 RW |
1661 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1662 | "error in _DSW or _PSW evaluation\n")); | |
1da177e4 | 1663 | } |
1da177e4 | 1664 | |
f33ce568 RW |
1665 | static void acpi_bus_init_power_state(struct acpi_device *device, int state) |
1666 | { | |
1667 | struct acpi_device_power_state *ps = &device->power.states[state]; | |
ef85bdbe RW |
1668 | char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; |
1669 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
f33ce568 | 1670 | acpi_status status; |
bf325f95 | 1671 | |
f33ce568 RW |
1672 | INIT_LIST_HEAD(&ps->resources); |
1673 | ||
ef85bdbe RW |
1674 | /* Evaluate "_PRx" to get referenced power resources */ |
1675 | status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); | |
1676 | if (ACPI_SUCCESS(status)) { | |
1677 | union acpi_object *package = buffer.pointer; | |
1678 | ||
1679 | if (buffer.length && package | |
1680 | && package->type == ACPI_TYPE_PACKAGE | |
1681 | && package->package.count) { | |
e88c9c60 RW |
1682 | int err = acpi_extract_power_resources(package, 0, |
1683 | &ps->resources); | |
1684 | if (!err) | |
ef85bdbe | 1685 | device->power.flags.power_resources = 1; |
f33ce568 | 1686 | } |
ef85bdbe | 1687 | ACPI_FREE(buffer.pointer); |
f33ce568 RW |
1688 | } |
1689 | ||
1690 | /* Evaluate "_PSx" to see if we can do explicit sets */ | |
ef85bdbe | 1691 | pathname[2] = 'S'; |
952c63e9 | 1692 | if (acpi_has_method(device->handle, pathname)) |
f33ce568 RW |
1693 | ps->flags.explicit_set = 1; |
1694 | ||
1695 | /* | |
1696 | * State is valid if there are means to put the device into it. | |
1697 | * D3hot is only valid if _PR3 present. | |
1698 | */ | |
ef85bdbe | 1699 | if (!list_empty(&ps->resources) |
f33ce568 RW |
1700 | || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) { |
1701 | ps->flags.valid = 1; | |
1702 | ps->flags.os_accessible = 1; | |
1703 | } | |
1704 | ||
1705 | ps->power = -1; /* Unknown - driver assigned */ | |
1706 | ps->latency = -1; /* Unknown - driver assigned */ | |
1707 | } | |
1708 | ||
d43e167d | 1709 | static void acpi_bus_get_power_flags(struct acpi_device *device) |
1da177e4 | 1710 | { |
8bc5053b | 1711 | u32 i; |
1a365616 | 1712 | |
d43e167d | 1713 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ |
952c63e9 JL |
1714 | if (!acpi_has_method(device->handle, "_PS0") && |
1715 | !acpi_has_method(device->handle, "_PR0")) | |
1716 | return; | |
1a365616 | 1717 | |
d43e167d | 1718 | device->flags.power_manageable = 1; |
4be44fcd | 1719 | |
9e89dde2 ZR |
1720 | /* |
1721 | * Power Management Flags | |
1722 | */ | |
952c63e9 | 1723 | if (acpi_has_method(device->handle, "_PSC")) |
9e89dde2 | 1724 | device->power.flags.explicit_get = 1; |
f25c0ae2 | 1725 | |
952c63e9 | 1726 | if (acpi_has_method(device->handle, "_IRC")) |
9e89dde2 | 1727 | device->power.flags.inrush_current = 1; |
1da177e4 | 1728 | |
f25c0ae2 RW |
1729 | if (acpi_has_method(device->handle, "_DSW")) |
1730 | device->power.flags.dsw_present = 1; | |
1731 | ||
9e89dde2 ZR |
1732 | /* |
1733 | * Enumerate supported power management states | |
1734 | */ | |
f33ce568 RW |
1735 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) |
1736 | acpi_bus_init_power_state(device, i); | |
bf325f95 | 1737 | |
0b224527 | 1738 | INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); |
1da177e4 | 1739 | |
9e89dde2 ZR |
1740 | /* Set defaults for D0 and D3 states (always valid) */ |
1741 | device->power.states[ACPI_STATE_D0].flags.valid = 1; | |
1742 | device->power.states[ACPI_STATE_D0].power = 100; | |
8ad928d5 RW |
1743 | device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; |
1744 | device->power.states[ACPI_STATE_D3_COLD].power = 0; | |
c8f7a62c | 1745 | |
5c7dd710 RW |
1746 | /* Set D3cold's explicit_set flag if _PS3 exists. */ |
1747 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set) | |
1748 | device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1; | |
1749 | ||
1399dfcd AL |
1750 | /* Presence of _PS3 or _PRx means we can put the device into D3 cold */ |
1751 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set || | |
1752 | device->power.flags.power_resources) | |
1753 | device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1; | |
1754 | ||
1b1f3e16 | 1755 | if (acpi_bus_init_power(device)) |
b3785492 | 1756 | device->flags.power_manageable = 0; |
9e89dde2 | 1757 | } |
c8f7a62c | 1758 | |
d43e167d | 1759 | static void acpi_bus_get_flags(struct acpi_device *device) |
1da177e4 | 1760 | { |
1da177e4 | 1761 | /* Presence of _STA indicates 'dynamic_status' */ |
952c63e9 | 1762 | if (acpi_has_method(device->handle, "_STA")) |
1da177e4 LT |
1763 | device->flags.dynamic_status = 1; |
1764 | ||
1da177e4 | 1765 | /* Presence of _RMV indicates 'removable' */ |
952c63e9 | 1766 | if (acpi_has_method(device->handle, "_RMV")) |
1da177e4 LT |
1767 | device->flags.removable = 1; |
1768 | ||
1769 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ | |
952c63e9 JL |
1770 | if (acpi_has_method(device->handle, "_EJD") || |
1771 | acpi_has_method(device->handle, "_EJ0")) | |
1da177e4 | 1772 | device->flags.ejectable = 1; |
1da177e4 LT |
1773 | } |
1774 | ||
c7bcb4e9 | 1775 | static void acpi_device_get_busid(struct acpi_device *device) |
1da177e4 | 1776 | { |
4be44fcd LB |
1777 | char bus_id[5] = { '?', 0 }; |
1778 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; | |
1779 | int i = 0; | |
1da177e4 LT |
1780 | |
1781 | /* | |
1782 | * Bus ID | |
1783 | * ------ | |
1784 | * The device's Bus ID is simply the object name. | |
1785 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? | |
1786 | */ | |
859ac9a4 | 1787 | if (ACPI_IS_ROOT_DEVICE(device)) { |
1da177e4 | 1788 | strcpy(device->pnp.bus_id, "ACPI"); |
859ac9a4 BH |
1789 | return; |
1790 | } | |
1791 | ||
1792 | switch (device->device_type) { | |
1da177e4 LT |
1793 | case ACPI_BUS_TYPE_POWER_BUTTON: |
1794 | strcpy(device->pnp.bus_id, "PWRF"); | |
1795 | break; | |
1796 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
1797 | strcpy(device->pnp.bus_id, "SLPF"); | |
1798 | break; | |
1799 | default: | |
66b7ed40 | 1800 | acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); |
1da177e4 LT |
1801 | /* Clean up trailing underscores (if any) */ |
1802 | for (i = 3; i > 1; i--) { | |
1803 | if (bus_id[i] == '_') | |
1804 | bus_id[i] = '\0'; | |
1805 | else | |
1806 | break; | |
1807 | } | |
1808 | strcpy(device->pnp.bus_id, bus_id); | |
1809 | break; | |
1810 | } | |
1811 | } | |
1812 | ||
ebf4df8d JL |
1813 | /* |
1814 | * acpi_ata_match - see if an acpi object is an ATA device | |
1815 | * | |
1816 | * If an acpi object has one of the ACPI ATA methods defined, | |
1817 | * then we can safely call it an ATA device. | |
1818 | */ | |
1819 | bool acpi_ata_match(acpi_handle handle) | |
1820 | { | |
1821 | return acpi_has_method(handle, "_GTF") || | |
1822 | acpi_has_method(handle, "_GTM") || | |
1823 | acpi_has_method(handle, "_STM") || | |
1824 | acpi_has_method(handle, "_SDD"); | |
1825 | } | |
1826 | ||
54735266 | 1827 | /* |
d4e1a692 | 1828 | * acpi_bay_match - see if an acpi object is an ejectable driver bay |
54735266 ZR |
1829 | * |
1830 | * If an acpi object is ejectable and has one of the ACPI ATA methods defined, | |
1831 | * then we can safely call it an ejectable drive bay | |
1832 | */ | |
ebf4df8d | 1833 | bool acpi_bay_match(acpi_handle handle) |
d4e1a692 | 1834 | { |
54735266 ZR |
1835 | acpi_handle phandle; |
1836 | ||
952c63e9 | 1837 | if (!acpi_has_method(handle, "_EJ0")) |
ebf4df8d JL |
1838 | return false; |
1839 | if (acpi_ata_match(handle)) | |
1840 | return true; | |
1841 | if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) | |
1842 | return false; | |
54735266 | 1843 | |
ebf4df8d | 1844 | return acpi_ata_match(phandle); |
54735266 ZR |
1845 | } |
1846 | ||
b43109fa | 1847 | bool acpi_device_is_battery(struct acpi_device *adev) |
1e2380cd | 1848 | { |
b43109fa | 1849 | struct acpi_hardware_id *hwid; |
1e2380cd | 1850 | |
b43109fa RW |
1851 | list_for_each_entry(hwid, &adev->pnp.ids, list) |
1852 | if (!strcmp("PNP0C0A", hwid->id)) | |
1853 | return true; | |
1e2380cd | 1854 | |
b43109fa | 1855 | return false; |
1e2380cd RW |
1856 | } |
1857 | ||
b43109fa | 1858 | static bool is_ejectable_bay(struct acpi_device *adev) |
1e2380cd | 1859 | { |
b43109fa RW |
1860 | acpi_handle handle = adev->handle; |
1861 | ||
1862 | if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev)) | |
1e2380cd RW |
1863 | return true; |
1864 | ||
1865 | return acpi_bay_match(handle); | |
1866 | } | |
1867 | ||
3620f2f2 | 1868 | /* |
d4e1a692 | 1869 | * acpi_dock_match - see if an acpi object has a _DCK method |
3620f2f2 | 1870 | */ |
ebf4df8d | 1871 | bool acpi_dock_match(acpi_handle handle) |
3620f2f2 | 1872 | { |
ebf4df8d | 1873 | return acpi_has_method(handle, "_DCK"); |
3620f2f2 FS |
1874 | } |
1875 | ||
620e112c | 1876 | const char *acpi_device_hid(struct acpi_device *device) |
15b8dd53 | 1877 | { |
7f47fa6c | 1878 | struct acpi_hardware_id *hid; |
15b8dd53 | 1879 | |
2b2ae7c7 TR |
1880 | if (list_empty(&device->pnp.ids)) |
1881 | return dummy_hid; | |
1882 | ||
7f47fa6c BH |
1883 | hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); |
1884 | return hid->id; | |
1885 | } | |
1886 | EXPORT_SYMBOL(acpi_device_hid); | |
15b8dd53 | 1887 | |
d4e1a692 | 1888 | static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) |
7f47fa6c BH |
1889 | { |
1890 | struct acpi_hardware_id *id; | |
15b8dd53 | 1891 | |
7f47fa6c BH |
1892 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
1893 | if (!id) | |
1894 | return; | |
15b8dd53 | 1895 | |
581de59e | 1896 | id->id = kstrdup(dev_id, GFP_KERNEL); |
7f47fa6c BH |
1897 | if (!id->id) { |
1898 | kfree(id); | |
1899 | return; | |
15b8dd53 BM |
1900 | } |
1901 | ||
d4e1a692 TK |
1902 | list_add_tail(&id->list, &pnp->ids); |
1903 | pnp->type.hardware_id = 1; | |
15b8dd53 BM |
1904 | } |
1905 | ||
222e82ac DW |
1906 | /* |
1907 | * Old IBM workstations have a DSDT bug wherein the SMBus object | |
1908 | * lacks the SMBUS01 HID and the methods do not have the necessary "_" | |
1909 | * prefix. Work around this. | |
1910 | */ | |
ebf4df8d | 1911 | static bool acpi_ibm_smbus_match(acpi_handle handle) |
222e82ac | 1912 | { |
ebf4df8d JL |
1913 | char node_name[ACPI_PATH_SEGMENT_LENGTH]; |
1914 | struct acpi_buffer path = { sizeof(node_name), node_name }; | |
222e82ac DW |
1915 | |
1916 | if (!dmi_name_in_vendors("IBM")) | |
ebf4df8d | 1917 | return false; |
222e82ac DW |
1918 | |
1919 | /* Look for SMBS object */ | |
ebf4df8d JL |
1920 | if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || |
1921 | strcmp("SMBS", path.pointer)) | |
1922 | return false; | |
222e82ac DW |
1923 | |
1924 | /* Does it have the necessary (but misnamed) methods? */ | |
952c63e9 JL |
1925 | if (acpi_has_method(handle, "SBI") && |
1926 | acpi_has_method(handle, "SBR") && | |
1927 | acpi_has_method(handle, "SBW")) | |
ebf4df8d JL |
1928 | return true; |
1929 | ||
1930 | return false; | |
222e82ac DW |
1931 | } |
1932 | ||
ae3caa80 JL |
1933 | static bool acpi_object_is_system_bus(acpi_handle handle) |
1934 | { | |
1935 | acpi_handle tmp; | |
1936 | ||
1937 | if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) && | |
1938 | tmp == handle) | |
1939 | return true; | |
1940 | if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) && | |
1941 | tmp == handle) | |
1942 | return true; | |
1943 | ||
1944 | return false; | |
1945 | } | |
1946 | ||
c0af4175 TK |
1947 | static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, |
1948 | int device_type) | |
1da177e4 | 1949 | { |
4be44fcd | 1950 | acpi_status status; |
57f3674f | 1951 | struct acpi_device_info *info; |
78e25fef | 1952 | struct acpi_pnp_device_id_list *cid_list; |
7f47fa6c | 1953 | int i; |
1da177e4 | 1954 | |
c0af4175 | 1955 | switch (device_type) { |
1da177e4 | 1956 | case ACPI_BUS_TYPE_DEVICE: |
c0af4175 TK |
1957 | if (handle == ACPI_ROOT_OBJECT) { |
1958 | acpi_add_id(pnp, ACPI_SYSTEM_HID); | |
859ac9a4 BH |
1959 | break; |
1960 | } | |
1961 | ||
c0af4175 | 1962 | status = acpi_get_object_info(handle, &info); |
1da177e4 | 1963 | if (ACPI_FAILURE(status)) { |
c0af4175 TK |
1964 | pr_err(PREFIX "%s: Error reading device info\n", |
1965 | __func__); | |
1da177e4 LT |
1966 | return; |
1967 | } | |
1968 | ||
549e6845 | 1969 | if (info->valid & ACPI_VALID_HID) { |
c0af4175 | 1970 | acpi_add_id(pnp, info->hardware_id.string); |
549e6845 RW |
1971 | pnp->type.platform_id = 1; |
1972 | } | |
57f3674f | 1973 | if (info->valid & ACPI_VALID_CID) { |
15b8dd53 | 1974 | cid_list = &info->compatible_id_list; |
57f3674f | 1975 | for (i = 0; i < cid_list->count; i++) |
c0af4175 | 1976 | acpi_add_id(pnp, cid_list->ids[i].string); |
57f3674f | 1977 | } |
1da177e4 | 1978 | if (info->valid & ACPI_VALID_ADR) { |
c0af4175 TK |
1979 | pnp->bus_address = info->address; |
1980 | pnp->type.bus_address = 1; | |
1da177e4 | 1981 | } |
ccf78040 | 1982 | if (info->valid & ACPI_VALID_UID) |
c0af4175 | 1983 | pnp->unique_id = kstrdup(info->unique_id.string, |
ccf78040 | 1984 | GFP_KERNEL); |
ae843332 | 1985 | |
a83893ae BH |
1986 | kfree(info); |
1987 | ||
57f3674f BH |
1988 | /* |
1989 | * Some devices don't reliably have _HIDs & _CIDs, so add | |
1990 | * synthetic HIDs to make sure drivers can find them. | |
1991 | */ | |
c0af4175 TK |
1992 | if (acpi_is_video_device(handle)) |
1993 | acpi_add_id(pnp, ACPI_VIDEO_HID); | |
ebf4df8d | 1994 | else if (acpi_bay_match(handle)) |
c0af4175 | 1995 | acpi_add_id(pnp, ACPI_BAY_HID); |
ebf4df8d | 1996 | else if (acpi_dock_match(handle)) |
c0af4175 | 1997 | acpi_add_id(pnp, ACPI_DOCK_HID); |
ebf4df8d | 1998 | else if (acpi_ibm_smbus_match(handle)) |
c0af4175 | 1999 | acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); |
ae3caa80 JL |
2000 | else if (list_empty(&pnp->ids) && |
2001 | acpi_object_is_system_bus(handle)) { | |
2002 | /* \_SB, \_TZ, LNXSYBUS */ | |
2003 | acpi_add_id(pnp, ACPI_BUS_HID); | |
c0af4175 TK |
2004 | strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); |
2005 | strcpy(pnp->device_class, ACPI_BUS_CLASS); | |
b7b30de5 | 2006 | } |
54735266 | 2007 | |
1da177e4 LT |
2008 | break; |
2009 | case ACPI_BUS_TYPE_POWER: | |
c0af4175 | 2010 | acpi_add_id(pnp, ACPI_POWER_HID); |
1da177e4 LT |
2011 | break; |
2012 | case ACPI_BUS_TYPE_PROCESSOR: | |
c0af4175 | 2013 | acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); |
1da177e4 | 2014 | break; |
1da177e4 | 2015 | case ACPI_BUS_TYPE_THERMAL: |
c0af4175 | 2016 | acpi_add_id(pnp, ACPI_THERMAL_HID); |
1da177e4 LT |
2017 | break; |
2018 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
c0af4175 | 2019 | acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); |
1da177e4 LT |
2020 | break; |
2021 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
c0af4175 | 2022 | acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); |
1da177e4 LT |
2023 | break; |
2024 | } | |
1da177e4 LT |
2025 | } |
2026 | ||
c0af4175 TK |
2027 | void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) |
2028 | { | |
2029 | struct acpi_hardware_id *id, *tmp; | |
2030 | ||
2031 | list_for_each_entry_safe(id, tmp, &pnp->ids, list) { | |
2032 | kfree(id->id); | |
2033 | kfree(id); | |
2034 | } | |
2035 | kfree(pnp->unique_id); | |
2036 | } | |
2037 | ||
82c7d5ef RW |
2038 | void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, |
2039 | int type, unsigned long long sta) | |
1da177e4 | 2040 | { |
d43e167d RW |
2041 | INIT_LIST_HEAD(&device->pnp.ids); |
2042 | device->device_type = type; | |
2043 | device->handle = handle; | |
2044 | device->parent = acpi_bus_get_parent(handle); | |
8a0662d9 | 2045 | device->fwnode.type = FWNODE_ACPI; |
25db115b | 2046 | acpi_set_device_status(device, sta); |
d43e167d | 2047 | acpi_device_get_busid(device); |
c0af4175 | 2048 | acpi_set_pnp_ids(handle, &device->pnp, type); |
ffdcd955 | 2049 | acpi_init_properties(device); |
d43e167d | 2050 | acpi_bus_get_flags(device); |
2c0d4fe0 | 2051 | device->flags.match_driver = false; |
202317a5 RW |
2052 | device->flags.initialized = true; |
2053 | device->flags.visited = false; | |
cf860be6 RW |
2054 | device_initialize(&device->dev); |
2055 | dev_set_uevent_suppress(&device->dev, true); | |
2056 | } | |
bc3b0772 | 2057 | |
cf860be6 RW |
2058 | void acpi_device_add_finalize(struct acpi_device *device) |
2059 | { | |
2060 | dev_set_uevent_suppress(&device->dev, false); | |
2061 | kobject_uevent(&device->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
2062 | } |
2063 | ||
5c478f49 BH |
2064 | static int acpi_add_single_object(struct acpi_device **child, |
2065 | acpi_handle handle, int type, | |
2c0d4fe0 | 2066 | unsigned long long sta) |
1da177e4 | 2067 | { |
77c24888 BH |
2068 | int result; |
2069 | struct acpi_device *device; | |
29aaefa6 | 2070 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1da177e4 | 2071 | |
36bcbec7 | 2072 | device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
1da177e4 | 2073 | if (!device) { |
6468463a | 2074 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
d550d98d | 2075 | return -ENOMEM; |
1da177e4 | 2076 | } |
1da177e4 | 2077 | |
d43e167d RW |
2078 | acpi_init_device_object(device, handle, type, sta); |
2079 | acpi_bus_get_power_flags(device); | |
d57d09a4 | 2080 | acpi_bus_get_wakeup_device_flags(device); |
1da177e4 | 2081 | |
cf860be6 | 2082 | result = acpi_device_add(device, acpi_device_release); |
d43e167d | 2083 | if (result) { |
718fb0de | 2084 | acpi_device_release(&device->dev); |
d43e167d RW |
2085 | return result; |
2086 | } | |
1da177e4 | 2087 | |
d43e167d | 2088 | acpi_power_add_remove_device(device, true); |
cf860be6 | 2089 | acpi_device_add_finalize(device); |
d43e167d RW |
2090 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
2091 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n", | |
2092 | dev_name(&device->dev), (char *) buffer.pointer, | |
2093 | device->parent ? dev_name(&device->parent->dev) : "(null)")); | |
2094 | kfree(buffer.pointer); | |
2095 | *child = device; | |
2096 | return 0; | |
bf325f95 RW |
2097 | } |
2098 | ||
778cbc1d BH |
2099 | static int acpi_bus_type_and_status(acpi_handle handle, int *type, |
2100 | unsigned long long *sta) | |
1da177e4 | 2101 | { |
778cbc1d BH |
2102 | acpi_status status; |
2103 | acpi_object_type acpi_type; | |
1da177e4 | 2104 | |
778cbc1d | 2105 | status = acpi_get_type(handle, &acpi_type); |
51a85faf | 2106 | if (ACPI_FAILURE(status)) |
778cbc1d | 2107 | return -ENODEV; |
4be44fcd | 2108 | |
778cbc1d | 2109 | switch (acpi_type) { |
51a85faf BH |
2110 | case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ |
2111 | case ACPI_TYPE_DEVICE: | |
778cbc1d BH |
2112 | *type = ACPI_BUS_TYPE_DEVICE; |
2113 | status = acpi_bus_get_status_handle(handle, sta); | |
2114 | if (ACPI_FAILURE(status)) | |
2115 | return -ENODEV; | |
51a85faf BH |
2116 | break; |
2117 | case ACPI_TYPE_PROCESSOR: | |
778cbc1d BH |
2118 | *type = ACPI_BUS_TYPE_PROCESSOR; |
2119 | status = acpi_bus_get_status_handle(handle, sta); | |
2120 | if (ACPI_FAILURE(status)) | |
2121 | return -ENODEV; | |
51a85faf BH |
2122 | break; |
2123 | case ACPI_TYPE_THERMAL: | |
778cbc1d BH |
2124 | *type = ACPI_BUS_TYPE_THERMAL; |
2125 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
2126 | break; |
2127 | case ACPI_TYPE_POWER: | |
778cbc1d BH |
2128 | *type = ACPI_BUS_TYPE_POWER; |
2129 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
2130 | break; |
2131 | default: | |
778cbc1d | 2132 | return -ENODEV; |
51a85faf | 2133 | } |
1da177e4 | 2134 | |
778cbc1d BH |
2135 | return 0; |
2136 | } | |
2137 | ||
202317a5 RW |
2138 | bool acpi_device_is_present(struct acpi_device *adev) |
2139 | { | |
2140 | if (adev->status.present || adev->status.functional) | |
2141 | return true; | |
2142 | ||
2143 | adev->flags.initialized = false; | |
2144 | return false; | |
2145 | } | |
2146 | ||
4b59cc1f RW |
2147 | static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, |
2148 | char *idstr, | |
2149 | const struct acpi_device_id **matchid) | |
2150 | { | |
2151 | const struct acpi_device_id *devid; | |
2152 | ||
aca0a4eb RW |
2153 | if (handler->match) |
2154 | return handler->match(idstr, matchid); | |
2155 | ||
4b59cc1f RW |
2156 | for (devid = handler->ids; devid->id[0]; devid++) |
2157 | if (!strcmp((char *)devid->id, idstr)) { | |
2158 | if (matchid) | |
2159 | *matchid = devid; | |
2160 | ||
2161 | return true; | |
2162 | } | |
2163 | ||
2164 | return false; | |
2165 | } | |
2166 | ||
6b772e8f TK |
2167 | static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr, |
2168 | const struct acpi_device_id **matchid) | |
2169 | { | |
2170 | struct acpi_scan_handler *handler; | |
2171 | ||
2172 | list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) | |
2173 | if (acpi_scan_handler_matching(handler, idstr, matchid)) | |
2174 | return handler; | |
2175 | ||
2176 | return NULL; | |
2177 | } | |
2178 | ||
3f8055c3 RW |
2179 | void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) |
2180 | { | |
3f8055c3 RW |
2181 | if (!!hotplug->enabled == !!val) |
2182 | return; | |
2183 | ||
2184 | mutex_lock(&acpi_scan_lock); | |
2185 | ||
2186 | hotplug->enabled = val; | |
3f8055c3 RW |
2187 | |
2188 | mutex_unlock(&acpi_scan_lock); | |
2189 | } | |
2190 | ||
3c2cc7ff | 2191 | static void acpi_scan_init_hotplug(struct acpi_device *adev) |
a33ec399 | 2192 | { |
6b772e8f | 2193 | struct acpi_hardware_id *hwid; |
a33ec399 | 2194 | |
b43109fa | 2195 | if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) { |
1e2380cd RW |
2196 | acpi_dock_add(adev); |
2197 | return; | |
2198 | } | |
3c2cc7ff RW |
2199 | list_for_each_entry(hwid, &adev->pnp.ids, list) { |
2200 | struct acpi_scan_handler *handler; | |
a33ec399 | 2201 | |
6b772e8f | 2202 | handler = acpi_scan_match_handler(hwid->id, NULL); |
1a699476 RW |
2203 | if (handler) { |
2204 | adev->flags.hotplug_notify = true; | |
2205 | break; | |
2206 | } | |
3c2cc7ff | 2207 | } |
a33ec399 RW |
2208 | } |
2209 | ||
40e7fcb1 LT |
2210 | static void acpi_device_dep_initialize(struct acpi_device *adev) |
2211 | { | |
2212 | struct acpi_dep_data *dep; | |
2213 | struct acpi_handle_list dep_devices; | |
2214 | acpi_status status; | |
2215 | int i; | |
2216 | ||
2217 | if (!acpi_has_method(adev->handle, "_DEP")) | |
2218 | return; | |
2219 | ||
2220 | status = acpi_evaluate_reference(adev->handle, "_DEP", NULL, | |
2221 | &dep_devices); | |
2222 | if (ACPI_FAILURE(status)) { | |
80167a24 | 2223 | dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n"); |
40e7fcb1 LT |
2224 | return; |
2225 | } | |
2226 | ||
2227 | for (i = 0; i < dep_devices.count; i++) { | |
2228 | struct acpi_device_info *info; | |
2229 | int skip; | |
2230 | ||
2231 | status = acpi_get_object_info(dep_devices.handles[i], &info); | |
2232 | if (ACPI_FAILURE(status)) { | |
80167a24 | 2233 | dev_dbg(&adev->dev, "Error reading _DEP device info\n"); |
40e7fcb1 LT |
2234 | continue; |
2235 | } | |
2236 | ||
2237 | /* | |
2238 | * Skip the dependency of Windows System Power | |
2239 | * Management Controller | |
2240 | */ | |
2241 | skip = info->valid & ACPI_VALID_HID && | |
2242 | !strcmp(info->hardware_id.string, "INT3396"); | |
2243 | ||
2244 | kfree(info); | |
2245 | ||
2246 | if (skip) | |
2247 | continue; | |
2248 | ||
2249 | dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL); | |
2250 | if (!dep) | |
2251 | return; | |
2252 | ||
2253 | dep->master = dep_devices.handles[i]; | |
2254 | dep->slave = adev->handle; | |
2255 | adev->dep_unmet++; | |
2256 | ||
2257 | mutex_lock(&acpi_dep_list_lock); | |
2258 | list_add_tail(&dep->node , &acpi_dep_list); | |
2259 | mutex_unlock(&acpi_dep_list_lock); | |
2260 | } | |
2261 | } | |
2262 | ||
e3863094 RW |
2263 | static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, |
2264 | void *not_used, void **return_value) | |
778cbc1d | 2265 | { |
805d410f | 2266 | struct acpi_device *device = NULL; |
778cbc1d BH |
2267 | int type; |
2268 | unsigned long long sta; | |
2269 | int result; | |
2270 | ||
4002bf38 RW |
2271 | acpi_bus_get_device(handle, &device); |
2272 | if (device) | |
2273 | goto out; | |
2274 | ||
778cbc1d BH |
2275 | result = acpi_bus_type_and_status(handle, &type, &sta); |
2276 | if (result) | |
2277 | return AE_OK; | |
2278 | ||
82c7d5ef RW |
2279 | if (type == ACPI_BUS_TYPE_POWER) { |
2280 | acpi_add_power_resource(handle); | |
2281 | return AE_OK; | |
2282 | } | |
2283 | ||
2c0d4fe0 | 2284 | acpi_add_single_object(&device, handle, type, sta); |
e3b87f8a | 2285 | if (!device) |
51a85faf | 2286 | return AE_CTRL_DEPTH; |
1da177e4 | 2287 | |
3c2cc7ff | 2288 | acpi_scan_init_hotplug(device); |
40e7fcb1 | 2289 | acpi_device_dep_initialize(device); |
3c2cc7ff | 2290 | |
4002bf38 | 2291 | out: |
51a85faf BH |
2292 | if (!*return_value) |
2293 | *return_value = device; | |
805d410f | 2294 | |
51a85faf BH |
2295 | return AE_OK; |
2296 | } | |
3fb02738 | 2297 | |
48459340 ZR |
2298 | static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data) |
2299 | { | |
2300 | bool *is_spi_i2c_slave_p = data; | |
2301 | ||
2302 | if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) | |
2303 | return 1; | |
2304 | ||
2305 | /* | |
2306 | * devices that are connected to UART still need to be enumerated to | |
2307 | * platform bus | |
2308 | */ | |
2309 | if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART) | |
2310 | *is_spi_i2c_slave_p = true; | |
2311 | ||
2312 | /* no need to do more checking */ | |
2313 | return -1; | |
2314 | } | |
2315 | ||
2316 | static void acpi_default_enumeration(struct acpi_device *device) | |
2317 | { | |
2318 | struct list_head resource_list; | |
2319 | bool is_spi_i2c_slave = false; | |
2320 | ||
2321 | if (!device->pnp.type.platform_id || device->handler) | |
2322 | return; | |
2323 | ||
2324 | /* | |
2325 | * Do not enemerate SPI/I2C slaves as they will be enuerated by their | |
2326 | * respective parents. | |
2327 | */ | |
2328 | INIT_LIST_HEAD(&resource_list); | |
2329 | acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave, | |
2330 | &is_spi_i2c_slave); | |
2331 | acpi_dev_free_resource_list(&resource_list); | |
2332 | if (!is_spi_i2c_slave) | |
2333 | acpi_create_platform_device(device); | |
2334 | } | |
2335 | ||
c5698074 | 2336 | static int acpi_scan_attach_handler(struct acpi_device *device) |
ca589f94 | 2337 | { |
c5698074 RW |
2338 | struct acpi_hardware_id *hwid; |
2339 | int ret = 0; | |
ca589f94 | 2340 | |
c5698074 | 2341 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
87b85b3c | 2342 | const struct acpi_device_id *devid; |
c5698074 | 2343 | struct acpi_scan_handler *handler; |
ca589f94 | 2344 | |
c5698074 RW |
2345 | handler = acpi_scan_match_handler(hwid->id, &devid); |
2346 | if (handler) { | |
d34afa9d RW |
2347 | if (!handler->attach) { |
2348 | device->pnp.type.platform_id = 0; | |
2349 | continue; | |
2350 | } | |
9cb32acf | 2351 | device->handler = handler; |
87b85b3c | 2352 | ret = handler->attach(device, devid); |
9cb32acf | 2353 | if (ret > 0) |
c5698074 | 2354 | break; |
9cb32acf RW |
2355 | |
2356 | device->handler = NULL; | |
2357 | if (ret < 0) | |
c5698074 | 2358 | break; |
ca589f94 RW |
2359 | } |
2360 | } | |
48459340 ZR |
2361 | if (!ret) |
2362 | acpi_default_enumeration(device); | |
2363 | ||
ca589f94 RW |
2364 | return ret; |
2365 | } | |
2366 | ||
2c22e652 | 2367 | static void acpi_bus_attach(struct acpi_device *device) |
51a85faf | 2368 | { |
2c22e652 | 2369 | struct acpi_device *child; |
1e2380cd | 2370 | acpi_handle ejd; |
ca589f94 | 2371 | int ret; |
3fb02738 | 2372 | |
1e2380cd RW |
2373 | if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd))) |
2374 | register_dock_dependent_device(device, ejd); | |
2375 | ||
2c22e652 | 2376 | acpi_bus_get_status(device); |
202317a5 | 2377 | /* Skip devices that are not present. */ |
2c22e652 RW |
2378 | if (!acpi_device_is_present(device)) { |
2379 | device->flags.visited = false; | |
1b1f3e16 | 2380 | device->flags.power_manageable = 0; |
2c22e652 RW |
2381 | return; |
2382 | } | |
3a391a39 | 2383 | if (device->handler) |
2c22e652 | 2384 | goto ok; |
3a391a39 | 2385 | |
202317a5 | 2386 | if (!device->flags.initialized) { |
1b1f3e16 RW |
2387 | device->flags.power_manageable = |
2388 | device->power.states[ACPI_STATE_D0].flags.valid; | |
2389 | if (acpi_bus_init_power(device)) | |
2390 | device->flags.power_manageable = 0; | |
2391 | ||
202317a5 RW |
2392 | device->flags.initialized = true; |
2393 | } | |
2c22e652 | 2394 | device->flags.visited = false; |
ca589f94 | 2395 | ret = acpi_scan_attach_handler(device); |
6931007c | 2396 | if (ret < 0) |
2c22e652 | 2397 | return; |
6931007c RW |
2398 | |
2399 | device->flags.match_driver = true; | |
2c22e652 RW |
2400 | if (!ret) { |
2401 | ret = device_attach(&device->dev); | |
2402 | if (ret < 0) | |
2403 | return; | |
2404 | } | |
202317a5 | 2405 | device->flags.visited = true; |
202317a5 | 2406 | |
2c22e652 RW |
2407 | ok: |
2408 | list_for_each_entry(child, &device->children, node) | |
2409 | acpi_bus_attach(child); | |
8ab17fc9 RW |
2410 | |
2411 | if (device->handler && device->handler->hotplug.notify_online) | |
2412 | device->handler->hotplug.notify_online(device); | |
1da177e4 | 2413 | } |
1da177e4 | 2414 | |
40e7fcb1 LT |
2415 | void acpi_walk_dep_device_list(acpi_handle handle) |
2416 | { | |
2417 | struct acpi_dep_data *dep, *tmp; | |
2418 | struct acpi_device *adev; | |
2419 | ||
2420 | mutex_lock(&acpi_dep_list_lock); | |
2421 | list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) { | |
2422 | if (dep->master == handle) { | |
2423 | acpi_bus_get_device(dep->slave, &adev); | |
2424 | if (!adev) | |
2425 | continue; | |
2426 | ||
2427 | adev->dep_unmet--; | |
2428 | if (!adev->dep_unmet) | |
2429 | acpi_bus_attach(adev); | |
2430 | list_del(&dep->node); | |
2431 | kfree(dep); | |
2432 | } | |
2433 | } | |
2434 | mutex_unlock(&acpi_dep_list_lock); | |
2435 | } | |
2436 | EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list); | |
2437 | ||
636458de | 2438 | /** |
b8bd759a | 2439 | * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. |
636458de | 2440 | * @handle: Root of the namespace scope to scan. |
7779688f | 2441 | * |
636458de RW |
2442 | * Scan a given ACPI tree (probably recently hot-plugged) and create and add |
2443 | * found devices. | |
7779688f | 2444 | * |
636458de RW |
2445 | * If no devices were found, -ENODEV is returned, but it does not mean that |
2446 | * there has been a real error. There just have been no suitable ACPI objects | |
2447 | * in the table trunk from which the kernel could create a device and add an | |
2448 | * appropriate driver. | |
3757b948 RW |
2449 | * |
2450 | * Must be called under acpi_scan_lock. | |
7779688f | 2451 | */ |
b8bd759a | 2452 | int acpi_bus_scan(acpi_handle handle) |
3fb02738 | 2453 | { |
b8bd759a | 2454 | void *device = NULL; |
3fb02738 | 2455 | |
b8bd759a RW |
2456 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device))) |
2457 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
2458 | acpi_bus_check_add, NULL, NULL, &device); | |
3fb02738 | 2459 | |
2c22e652 RW |
2460 | if (device) { |
2461 | acpi_bus_attach(device); | |
2462 | return 0; | |
05404d8f | 2463 | } |
2c22e652 | 2464 | return -ENODEV; |
3fb02738 | 2465 | } |
2c22e652 | 2466 | EXPORT_SYMBOL(acpi_bus_scan); |
1da177e4 | 2467 | |
3757b948 | 2468 | /** |
2c22e652 RW |
2469 | * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects. |
2470 | * @adev: Root of the ACPI namespace scope to walk. | |
3757b948 RW |
2471 | * |
2472 | * Must be called under acpi_scan_lock. | |
2473 | */ | |
2c22e652 | 2474 | void acpi_bus_trim(struct acpi_device *adev) |
1da177e4 | 2475 | { |
2c22e652 RW |
2476 | struct acpi_scan_handler *handler = adev->handler; |
2477 | struct acpi_device *child; | |
2478 | ||
2479 | list_for_each_entry_reverse(child, &adev->children, node) | |
2480 | acpi_bus_trim(child); | |
2481 | ||
a951c773 | 2482 | adev->flags.match_driver = false; |
2c22e652 RW |
2483 | if (handler) { |
2484 | if (handler->detach) | |
2485 | handler->detach(adev); | |
2486 | ||
2487 | adev->handler = NULL; | |
2488 | } else { | |
2489 | device_release_driver(&adev->dev); | |
2490 | } | |
05404d8f | 2491 | /* |
2c22e652 RW |
2492 | * Most likely, the device is going away, so put it into D3cold before |
2493 | * that. | |
05404d8f | 2494 | */ |
2c22e652 RW |
2495 | acpi_device_set_power(adev, ACPI_STATE_D3_COLD); |
2496 | adev->flags.initialized = false; | |
2497 | adev->flags.visited = false; | |
1da177e4 | 2498 | } |
ceaba663 KA |
2499 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
2500 | ||
e8b945c9 | 2501 | static int acpi_bus_scan_fixed(void) |
1da177e4 | 2502 | { |
4be44fcd | 2503 | int result = 0; |
c4168bff | 2504 | |
1da177e4 LT |
2505 | /* |
2506 | * Enumerate all fixed-feature devices. | |
2507 | */ | |
2c0d4fe0 RW |
2508 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { |
2509 | struct acpi_device *device = NULL; | |
2510 | ||
5c478f49 | 2511 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2512 | ACPI_BUS_TYPE_POWER_BUTTON, |
2c0d4fe0 RW |
2513 | ACPI_STA_DEFAULT); |
2514 | if (result) | |
2515 | return result; | |
2516 | ||
88346167 | 2517 | device->flags.match_driver = true; |
2c0d4fe0 RW |
2518 | result = device_attach(&device->dev); |
2519 | if (result < 0) | |
2520 | return result; | |
2521 | ||
c10d7a13 | 2522 | device_init_wakeup(&device->dev, true); |
3fb02738 | 2523 | } |
1da177e4 | 2524 | |
2c0d4fe0 RW |
2525 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { |
2526 | struct acpi_device *device = NULL; | |
2527 | ||
5c478f49 | 2528 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2529 | ACPI_BUS_TYPE_SLEEP_BUTTON, |
2c0d4fe0 RW |
2530 | ACPI_STA_DEFAULT); |
2531 | if (result) | |
2532 | return result; | |
2533 | ||
88346167 | 2534 | device->flags.match_driver = true; |
2c0d4fe0 | 2535 | result = device_attach(&device->dev); |
3fb02738 | 2536 | } |
1da177e4 | 2537 | |
2c0d4fe0 | 2538 | return result < 0 ? result : 0; |
1da177e4 LT |
2539 | } |
2540 | ||
e747f274 | 2541 | int __init acpi_scan_init(void) |
1da177e4 LT |
2542 | { |
2543 | int result; | |
1da177e4 | 2544 | |
5b327265 PM |
2545 | result = bus_register(&acpi_bus_type); |
2546 | if (result) { | |
2547 | /* We don't want to quit even if we failed to add suspend/resume */ | |
2548 | printk(KERN_ERR PREFIX "Could not register bus type\n"); | |
2549 | } | |
2550 | ||
92ef2a25 | 2551 | acpi_pci_root_init(); |
4daeaf68 | 2552 | acpi_pci_link_init(); |
ac212b69 | 2553 | acpi_processor_init(); |
f58b082a | 2554 | acpi_lpss_init(); |
92082a88 | 2555 | acpi_apd_init(); |
2fa97feb | 2556 | acpi_cmos_rtc_init(); |
737f1a9f | 2557 | acpi_container_init(); |
0a347644 | 2558 | acpi_memory_hotplug_init(); |
eec15edb | 2559 | acpi_pnp_init(); |
3230bbfc | 2560 | acpi_int340x_thermal_init(); |
97d9a9e9 | 2561 | |
3757b948 | 2562 | mutex_lock(&acpi_scan_lock); |
1da177e4 LT |
2563 | /* |
2564 | * Enumerate devices in the ACPI namespace. | |
2565 | */ | |
0cd6ac52 RW |
2566 | result = acpi_bus_scan(ACPI_ROOT_OBJECT); |
2567 | if (result) | |
3757b948 | 2568 | goto out; |
1da177e4 | 2569 | |
0cd6ac52 | 2570 | result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); |
1da177e4 | 2571 | if (result) |
3757b948 | 2572 | goto out; |
1da177e4 | 2573 | |
2650ef42 AL |
2574 | /* Fixed feature devices do not exist on HW-reduced platform */ |
2575 | if (!acpi_gbl_reduced_hardware) { | |
2576 | result = acpi_bus_scan_fixed(); | |
2577 | if (result) { | |
2578 | acpi_detach_data(acpi_root->handle, | |
2579 | acpi_scan_drop_device); | |
2580 | acpi_device_del(acpi_root); | |
2581 | put_device(&acpi_root->dev); | |
2582 | goto out; | |
2583 | } | |
b8bd759a | 2584 | } |
1da177e4 | 2585 | |
b8bd759a | 2586 | acpi_update_all_gpes(); |
3757b948 RW |
2587 | |
2588 | out: | |
2589 | mutex_unlock(&acpi_scan_lock); | |
2590 | return result; | |
1da177e4 | 2591 | } |