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 | |
e49bd2dd | 39 | static LIST_HEAD(acpi_bus_id_list); |
c511cc19 | 40 | static DEFINE_MUTEX(acpi_scan_lock); |
ca589f94 | 41 | static LIST_HEAD(acpi_scan_handlers_list); |
9090589d | 42 | DEFINE_MUTEX(acpi_device_lock); |
1da177e4 | 43 | LIST_HEAD(acpi_wakeup_device_list); |
e525506f | 44 | static DEFINE_MUTEX(acpi_hp_context_lock); |
1da177e4 | 45 | |
e49bd2dd | 46 | struct acpi_device_bus_id{ |
bb095854 | 47 | char bus_id[15]; |
e49bd2dd ZR |
48 | unsigned int instance_no; |
49 | struct list_head node; | |
1da177e4 | 50 | }; |
29b71a1c | 51 | |
3757b948 RW |
52 | void acpi_scan_lock_acquire(void) |
53 | { | |
54 | mutex_lock(&acpi_scan_lock); | |
55 | } | |
56 | EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire); | |
57 | ||
58 | void acpi_scan_lock_release(void) | |
59 | { | |
60 | mutex_unlock(&acpi_scan_lock); | |
61 | } | |
62 | EXPORT_SYMBOL_GPL(acpi_scan_lock_release); | |
63 | ||
e525506f RW |
64 | void acpi_lock_hp_context(void) |
65 | { | |
66 | mutex_lock(&acpi_hp_context_lock); | |
67 | } | |
68 | ||
69 | void acpi_unlock_hp_context(void) | |
70 | { | |
71 | mutex_unlock(&acpi_hp_context_lock); | |
72 | } | |
73 | ||
ca589f94 RW |
74 | int acpi_scan_add_handler(struct acpi_scan_handler *handler) |
75 | { | |
76 | if (!handler || !handler->attach) | |
77 | return -EINVAL; | |
78 | ||
79 | list_add_tail(&handler->list_node, &acpi_scan_handlers_list); | |
80 | return 0; | |
81 | } | |
82 | ||
3f8055c3 RW |
83 | int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler, |
84 | const char *hotplug_profile_name) | |
85 | { | |
86 | int error; | |
87 | ||
88 | error = acpi_scan_add_handler(handler); | |
89 | if (error) | |
90 | return error; | |
91 | ||
92 | acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name); | |
93 | return 0; | |
94 | } | |
95 | ||
29b71a1c TR |
96 | /* |
97 | * Creates hid/cid(s) string needed for modalias and uevent | |
98 | * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: | |
99 | * char *modalias: "acpi:IBM0001:ACPI0001" | |
3d8e0090 ZR |
100 | * Return: 0: no _HID and no _CID |
101 | * -EINVAL: output error | |
102 | * -ENOMEM: output is truncated | |
29b71a1c | 103 | */ |
b3e572d2 AB |
104 | static int create_modalias(struct acpi_device *acpi_dev, char *modalias, |
105 | int size) | |
106 | { | |
29b71a1c | 107 | int len; |
5c9fcb5d | 108 | int count; |
7f47fa6c | 109 | struct acpi_hardware_id *id; |
29b71a1c | 110 | |
2b2ae7c7 TR |
111 | if (list_empty(&acpi_dev->pnp.ids)) |
112 | return 0; | |
113 | ||
5c9fcb5d | 114 | len = snprintf(modalias, size, "acpi:"); |
29b71a1c TR |
115 | size -= len; |
116 | ||
7f47fa6c BH |
117 | list_for_each_entry(id, &acpi_dev->pnp.ids, list) { |
118 | count = snprintf(&modalias[len], size, "%s:", id->id); | |
3d8e0090 ZR |
119 | if (count < 0) |
120 | return EINVAL; | |
121 | if (count >= size) | |
122 | return -ENOMEM; | |
5c9fcb5d ZR |
123 | len += count; |
124 | size -= count; | |
125 | } | |
126 | ||
29b71a1c TR |
127 | modalias[len] = '\0'; |
128 | return len; | |
129 | } | |
130 | ||
6eb2451f ZR |
131 | /* |
132 | * Creates uevent modalias field for ACPI enumerated devices. | |
133 | * Because the other buses does not support ACPI HIDs & CIDs. | |
134 | * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get: | |
135 | * "acpi:IBM0001:ACPI0001" | |
136 | */ | |
137 | int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env) | |
138 | { | |
139 | struct acpi_device *acpi_dev; | |
140 | int len; | |
141 | ||
142 | acpi_dev = ACPI_COMPANION(dev); | |
143 | if (!acpi_dev) | |
144 | return -ENODEV; | |
145 | ||
146 | /* Fall back to bus specific way of modalias exporting */ | |
147 | if (list_empty(&acpi_dev->pnp.ids)) | |
148 | return -ENODEV; | |
149 | ||
150 | if (add_uevent_var(env, "MODALIAS=")) | |
151 | return -ENOMEM; | |
152 | len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], | |
153 | sizeof(env->buf) - env->buflen); | |
154 | if (len <= 0) | |
155 | return len; | |
156 | env->buflen += len; | |
157 | return 0; | |
158 | } | |
159 | EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias); | |
160 | ||
161 | /* | |
162 | * Creates modalias sysfs attribute for ACPI enumerated devices. | |
163 | * Because the other buses does not support ACPI HIDs & CIDs. | |
164 | * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get: | |
165 | * "acpi:IBM0001:ACPI0001" | |
166 | */ | |
167 | int acpi_device_modalias(struct device *dev, char *buf, int size) | |
168 | { | |
169 | struct acpi_device *acpi_dev; | |
170 | int len; | |
171 | ||
172 | acpi_dev = ACPI_COMPANION(dev); | |
173 | if (!acpi_dev) | |
174 | return -ENODEV; | |
175 | ||
176 | /* Fall back to bus specific way of modalias exporting */ | |
177 | if (list_empty(&acpi_dev->pnp.ids)) | |
178 | return -ENODEV; | |
179 | ||
180 | len = create_modalias(acpi_dev, buf, size -1); | |
181 | if (len <= 0) | |
182 | return len; | |
183 | buf[len++] = '\n'; | |
184 | return len; | |
185 | } | |
186 | EXPORT_SYMBOL_GPL(acpi_device_modalias); | |
187 | ||
29b71a1c TR |
188 | static ssize_t |
189 | acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
190 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
191 | int len; | |
192 | ||
29b71a1c TR |
193 | len = create_modalias(acpi_dev, buf, 1024); |
194 | if (len <= 0) | |
3d8e0090 | 195 | return len; |
29b71a1c TR |
196 | buf[len++] = '\n'; |
197 | return len; | |
198 | } | |
199 | static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); | |
200 | ||
caa73ea1 | 201 | bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent) |
d22ddcbc RW |
202 | { |
203 | struct acpi_device_physical_node *pn; | |
204 | bool offline = true; | |
205 | ||
206 | mutex_lock(&adev->physical_node_lock); | |
207 | ||
208 | list_for_each_entry(pn, &adev->physical_node_list, node) | |
209 | if (device_supports_offline(pn->dev) && !pn->dev->offline) { | |
caa73ea1 RW |
210 | if (uevent) |
211 | kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE); | |
212 | ||
d22ddcbc RW |
213 | offline = false; |
214 | break; | |
215 | } | |
216 | ||
217 | mutex_unlock(&adev->physical_node_lock); | |
218 | return offline; | |
219 | } | |
220 | ||
7f28ddec RW |
221 | static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data, |
222 | void **ret_p) | |
683058e3 RW |
223 | { |
224 | struct acpi_device *device = NULL; | |
225 | struct acpi_device_physical_node *pn; | |
303bfdb1 | 226 | bool second_pass = (bool)data; |
683058e3 RW |
227 | acpi_status status = AE_OK; |
228 | ||
229 | if (acpi_bus_get_device(handle, &device)) | |
230 | return AE_OK; | |
231 | ||
7f28ddec RW |
232 | if (device->handler && !device->handler->hotplug.enabled) { |
233 | *ret_p = &device->dev; | |
234 | return AE_SUPPORT; | |
235 | } | |
236 | ||
683058e3 RW |
237 | mutex_lock(&device->physical_node_lock); |
238 | ||
239 | list_for_each_entry(pn, &device->physical_node_list, node) { | |
240 | int ret; | |
241 | ||
303bfdb1 RW |
242 | if (second_pass) { |
243 | /* Skip devices offlined by the first pass. */ | |
244 | if (pn->put_online) | |
245 | continue; | |
246 | } else { | |
247 | pn->put_online = false; | |
248 | } | |
683058e3 RW |
249 | ret = device_offline(pn->dev); |
250 | if (acpi_force_hot_remove) | |
251 | continue; | |
252 | ||
303bfdb1 RW |
253 | if (ret >= 0) { |
254 | pn->put_online = !ret; | |
255 | } else { | |
256 | *ret_p = pn->dev; | |
257 | if (second_pass) { | |
258 | status = AE_ERROR; | |
259 | break; | |
260 | } | |
683058e3 | 261 | } |
683058e3 RW |
262 | } |
263 | ||
264 | mutex_unlock(&device->physical_node_lock); | |
265 | ||
266 | return status; | |
267 | } | |
268 | ||
7f28ddec RW |
269 | static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data, |
270 | void **ret_p) | |
683058e3 RW |
271 | { |
272 | struct acpi_device *device = NULL; | |
273 | struct acpi_device_physical_node *pn; | |
274 | ||
275 | if (acpi_bus_get_device(handle, &device)) | |
276 | return AE_OK; | |
277 | ||
278 | mutex_lock(&device->physical_node_lock); | |
279 | ||
280 | list_for_each_entry(pn, &device->physical_node_list, node) | |
281 | if (pn->put_online) { | |
282 | device_online(pn->dev); | |
283 | pn->put_online = false; | |
284 | } | |
285 | ||
286 | mutex_unlock(&device->physical_node_lock); | |
287 | ||
288 | return AE_OK; | |
289 | } | |
290 | ||
d22ddcbc | 291 | static int acpi_scan_try_to_offline(struct acpi_device *device) |
1da177e4 | 292 | { |
5993c467 | 293 | acpi_handle handle = device->handle; |
d22ddcbc | 294 | struct device *errdev = NULL; |
a33ec399 | 295 | acpi_status status; |
f058cdf4 | 296 | |
303bfdb1 RW |
297 | /* |
298 | * Carry out two passes here and ignore errors in the first pass, | |
299 | * because if the devices in question are memory blocks and | |
300 | * CONFIG_MEMCG is set, one of the blocks may hold data structures | |
301 | * that the other blocks depend on, but it is not known in advance which | |
302 | * block holds them. | |
303 | * | |
304 | * If the first pass is successful, the second one isn't needed, though. | |
305 | */ | |
7f28ddec RW |
306 | status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
307 | NULL, acpi_bus_offline, (void *)false, | |
308 | (void **)&errdev); | |
309 | if (status == AE_SUPPORT) { | |
310 | dev_warn(errdev, "Offline disabled.\n"); | |
311 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
312 | acpi_bus_online, NULL, NULL, NULL); | |
7f28ddec RW |
313 | return -EPERM; |
314 | } | |
315 | acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev); | |
303bfdb1 RW |
316 | if (errdev) { |
317 | errdev = NULL; | |
683058e3 | 318 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
7f28ddec RW |
319 | NULL, acpi_bus_offline, (void *)true, |
320 | (void **)&errdev); | |
303bfdb1 | 321 | if (!errdev || acpi_force_hot_remove) |
7f28ddec RW |
322 | acpi_bus_offline(handle, 0, (void *)true, |
323 | (void **)&errdev); | |
303bfdb1 RW |
324 | |
325 | if (errdev && !acpi_force_hot_remove) { | |
326 | dev_warn(errdev, "Offline failed.\n"); | |
7f28ddec | 327 | acpi_bus_online(handle, 0, NULL, NULL); |
303bfdb1 | 328 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, |
7f28ddec RW |
329 | ACPI_UINT32_MAX, acpi_bus_online, |
330 | NULL, NULL, NULL); | |
303bfdb1 RW |
331 | return -EBUSY; |
332 | } | |
683058e3 | 333 | } |
d22ddcbc RW |
334 | return 0; |
335 | } | |
336 | ||
337 | static int acpi_scan_hot_remove(struct acpi_device *device) | |
338 | { | |
339 | acpi_handle handle = device->handle; | |
340 | unsigned long long sta; | |
341 | acpi_status status; | |
342 | ||
343 | if (device->handler->hotplug.demand_offline && !acpi_force_hot_remove) { | |
caa73ea1 | 344 | if (!acpi_scan_is_offline(device, true)) |
d22ddcbc RW |
345 | return -EBUSY; |
346 | } else { | |
347 | int error = acpi_scan_try_to_offline(device); | |
348 | if (error) | |
349 | return error; | |
350 | } | |
683058e3 | 351 | |
26d46867 | 352 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
0794469d | 353 | "Hot-removing device %s...\n", dev_name(&device->dev))); |
26d46867 | 354 | |
bfee26db | 355 | acpi_bus_trim(device); |
683058e3 | 356 | |
7d2421f8 | 357 | acpi_evaluate_lck(handle, 0); |
1da177e4 LT |
358 | /* |
359 | * TBD: _EJD support. | |
360 | */ | |
7d2421f8 JL |
361 | status = acpi_evaluate_ej0(handle); |
362 | if (status == AE_NOT_FOUND) | |
363 | return -ENODEV; | |
364 | else if (ACPI_FAILURE(status)) | |
365 | return -EIO; | |
1da177e4 | 366 | |
882fd12e TK |
367 | /* |
368 | * Verify if eject was indeed successful. If not, log an error | |
369 | * message. No need to call _OST since _EJ0 call was made OK. | |
370 | */ | |
371 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
372 | if (ACPI_FAILURE(status)) { | |
373 | acpi_handle_warn(handle, | |
374 | "Status check after eject failed (0x%x)\n", status); | |
375 | } else if (sta & ACPI_STA_DEVICE_ENABLED) { | |
376 | acpi_handle_warn(handle, | |
377 | "Eject incomplete - status 0x%llx\n", sta); | |
378 | } | |
379 | ||
a33ec399 RW |
380 | return 0; |
381 | } | |
1da177e4 | 382 | |
443fc820 RW |
383 | static int acpi_scan_device_not_present(struct acpi_device *adev) |
384 | { | |
385 | if (!acpi_device_enumerated(adev)) { | |
386 | dev_warn(&adev->dev, "Still not present\n"); | |
387 | return -EALREADY; | |
388 | } | |
389 | acpi_bus_trim(adev); | |
390 | return 0; | |
391 | } | |
392 | ||
c27b2c33 | 393 | static int acpi_scan_device_check(struct acpi_device *adev) |
a33ec399 | 394 | { |
f943db40 | 395 | int error; |
a33ec399 | 396 | |
443fc820 RW |
397 | acpi_bus_get_status(adev); |
398 | if (adev->status.present || adev->status.functional) { | |
399 | /* | |
400 | * This function is only called for device objects for which | |
401 | * matching scan handlers exist. The only situation in which | |
402 | * the scan handler is not attached to this device object yet | |
403 | * is when the device has just appeared (either it wasn't | |
404 | * present at all before or it was removed and then added | |
405 | * again). | |
406 | */ | |
407 | if (adev->handler) { | |
408 | dev_warn(&adev->dev, "Already enumerated\n"); | |
409 | return -EALREADY; | |
410 | } | |
411 | error = acpi_bus_scan(adev->handle); | |
412 | if (error) { | |
413 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
414 | return error; | |
415 | } | |
416 | if (!adev->handler) { | |
417 | dev_warn(&adev->dev, "Enumeration failure\n"); | |
418 | error = -ENODEV; | |
419 | } | |
420 | } else { | |
421 | error = acpi_scan_device_not_present(adev); | |
422 | } | |
423 | return error; | |
424 | } | |
425 | ||
426 | static int acpi_scan_bus_check(struct acpi_device *adev) | |
427 | { | |
428 | struct acpi_scan_handler *handler = adev->handler; | |
429 | struct acpi_device *child; | |
430 | int error; | |
431 | ||
432 | acpi_bus_get_status(adev); | |
433 | if (!(adev->status.present || adev->status.functional)) { | |
434 | acpi_scan_device_not_present(adev); | |
435 | return 0; | |
436 | } | |
437 | if (handler && handler->hotplug.scan_dependent) | |
438 | return handler->hotplug.scan_dependent(adev); | |
439 | ||
c27b2c33 RW |
440 | error = acpi_bus_scan(adev->handle); |
441 | if (error) { | |
442 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
443 | return error; | |
444 | } | |
443fc820 RW |
445 | list_for_each_entry(child, &adev->children, node) { |
446 | error = acpi_scan_bus_check(child); | |
447 | if (error) | |
448 | return error; | |
c27b2c33 RW |
449 | } |
450 | return 0; | |
a33ec399 RW |
451 | } |
452 | ||
3c2cc7ff RW |
453 | static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type) |
454 | { | |
455 | switch (type) { | |
456 | case ACPI_NOTIFY_BUS_CHECK: | |
457 | return acpi_scan_bus_check(adev); | |
458 | case ACPI_NOTIFY_DEVICE_CHECK: | |
459 | return acpi_scan_device_check(adev); | |
460 | case ACPI_NOTIFY_EJECT_REQUEST: | |
461 | case ACPI_OST_EC_OSPM_EJECT: | |
dd2151be RW |
462 | if (adev->handler && !adev->handler->hotplug.enabled) { |
463 | dev_info(&adev->dev, "Eject disabled\n"); | |
464 | return -EPERM; | |
465 | } | |
466 | acpi_evaluate_hotplug_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST, | |
467 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); | |
3c2cc7ff RW |
468 | return acpi_scan_hot_remove(adev); |
469 | } | |
470 | return -EINVAL; | |
471 | } | |
472 | ||
1a699476 | 473 | void acpi_device_hotplug(void *data, u32 src) |
a33ec399 | 474 | { |
a33ec399 | 475 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
c27b2c33 | 476 | struct acpi_device *adev = data; |
3c2cc7ff | 477 | int error = -ENODEV; |
a33ec399 | 478 | |
683058e3 | 479 | lock_device_hotplug(); |
e0ae8fee | 480 | mutex_lock(&acpi_scan_lock); |
a33ec399 | 481 | |
c27b2c33 RW |
482 | /* |
483 | * The device object's ACPI handle cannot become invalid as long as we | |
3c2cc7ff | 484 | * are holding acpi_scan_lock, but it might have become invalid before |
c27b2c33 RW |
485 | * that lock was acquired. |
486 | */ | |
487 | if (adev->handle == INVALID_ACPI_HANDLE) | |
3c2cc7ff | 488 | goto err_out; |
c27b2c33 | 489 | |
3c2cc7ff RW |
490 | if (adev->flags.hotplug_notify) { |
491 | error = acpi_generic_hotplug_event(adev, src); | |
dd2151be RW |
492 | if (error == -EPERM) { |
493 | ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; | |
494 | goto err_out; | |
495 | } | |
3c2cc7ff RW |
496 | } else { |
497 | int (*event)(struct acpi_device *, u32); | |
498 | ||
499 | acpi_lock_hp_context(); | |
500 | event = adev->hp ? adev->hp->event : NULL; | |
501 | acpi_unlock_hp_context(); | |
502 | /* | |
503 | * There may be additional notify handlers for device objects | |
504 | * without the .event() callback, so ignore them here. | |
505 | */ | |
506 | if (event) | |
507 | error = event(adev, src); | |
508 | else | |
509 | goto out; | |
a33ec399 | 510 | } |
c27b2c33 RW |
511 | if (!error) |
512 | ost_code = ACPI_OST_SC_SUCCESS; | |
a33ec399 | 513 | |
3c2cc7ff | 514 | err_out: |
c27b2c33 | 515 | acpi_evaluate_hotplug_ost(adev->handle, src, ost_code, NULL); |
3c2cc7ff RW |
516 | |
517 | out: | |
78ea4639 | 518 | acpi_bus_put_acpi_device(adev); |
a33ec399 | 519 | mutex_unlock(&acpi_scan_lock); |
e0ae8fee | 520 | unlock_device_hotplug(); |
a33ec399 RW |
521 | } |
522 | ||
836aedb1 RW |
523 | static ssize_t real_power_state_show(struct device *dev, |
524 | struct device_attribute *attr, char *buf) | |
525 | { | |
526 | struct acpi_device *adev = to_acpi_device(dev); | |
527 | int state; | |
528 | int ret; | |
529 | ||
530 | ret = acpi_device_get_power(adev, &state); | |
531 | if (ret) | |
532 | return ret; | |
533 | ||
534 | return sprintf(buf, "%s\n", acpi_power_state_string(state)); | |
535 | } | |
536 | ||
537 | static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL); | |
538 | ||
539 | static ssize_t power_state_show(struct device *dev, | |
540 | struct device_attribute *attr, char *buf) | |
541 | { | |
542 | struct acpi_device *adev = to_acpi_device(dev); | |
543 | ||
544 | return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state)); | |
545 | } | |
546 | ||
547 | static DEVICE_ATTR(power_state, 0444, power_state_show, NULL); | |
548 | ||
1da177e4 | 549 | static ssize_t |
f883d9db PM |
550 | acpi_eject_store(struct device *d, struct device_attribute *attr, |
551 | const char *buf, size_t count) | |
1da177e4 | 552 | { |
f883d9db | 553 | struct acpi_device *acpi_device = to_acpi_device(d); |
a33ec399 RW |
554 | acpi_object_type not_used; |
555 | acpi_status status; | |
1da177e4 | 556 | |
a33ec399 | 557 | if (!count || buf[0] != '1') |
1da177e4 | 558 | return -EINVAL; |
1da177e4 | 559 | |
a33ec399 RW |
560 | if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled) |
561 | && !acpi_device->driver) | |
562 | return -ENODEV; | |
563 | ||
564 | status = acpi_get_type(acpi_device->handle, ¬_used); | |
565 | if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable) | |
566 | return -ENODEV; | |
567 | ||
a33ec399 | 568 | get_device(&acpi_device->dev); |
c27b2c33 | 569 | status = acpi_hotplug_execute(acpi_device_hotplug, acpi_device, |
7b98118a | 570 | ACPI_OST_EC_OSPM_EJECT); |
f943db40 RW |
571 | if (ACPI_SUCCESS(status)) |
572 | return count; | |
a33ec399 | 573 | |
f943db40 | 574 | put_device(&acpi_device->dev); |
f943db40 | 575 | acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, |
a33ec399 | 576 | ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); |
5add99cf | 577 | return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN; |
1da177e4 LT |
578 | } |
579 | ||
f883d9db | 580 | static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); |
1da177e4 | 581 | |
e49bd2dd ZR |
582 | static ssize_t |
583 | acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
584 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
1da177e4 | 585 | |
ea8d82fd | 586 | return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev)); |
1da177e4 | 587 | } |
e49bd2dd | 588 | static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); |
1da177e4 | 589 | |
923d4a45 LZ |
590 | static ssize_t acpi_device_uid_show(struct device *dev, |
591 | struct device_attribute *attr, char *buf) | |
592 | { | |
593 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
594 | ||
595 | return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id); | |
596 | } | |
597 | static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL); | |
598 | ||
599 | static ssize_t acpi_device_adr_show(struct device *dev, | |
600 | struct device_attribute *attr, char *buf) | |
601 | { | |
602 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
603 | ||
604 | return sprintf(buf, "0x%08x\n", | |
605 | (unsigned int)(acpi_dev->pnp.bus_address)); | |
606 | } | |
607 | static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL); | |
608 | ||
e49bd2dd ZR |
609 | static ssize_t |
610 | acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
611 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
612 | struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; | |
613 | int result; | |
1da177e4 | 614 | |
e49bd2dd | 615 | result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); |
0c526d96 | 616 | if (result) |
e49bd2dd | 617 | goto end; |
1da177e4 | 618 | |
e49bd2dd ZR |
619 | result = sprintf(buf, "%s\n", (char*)path.pointer); |
620 | kfree(path.pointer); | |
0c526d96 | 621 | end: |
e49bd2dd | 622 | return result; |
1da177e4 | 623 | } |
e49bd2dd | 624 | static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); |
1da177e4 | 625 | |
d1efe3c3 LO |
626 | /* sysfs file that shows description text from the ACPI _STR method */ |
627 | static ssize_t description_show(struct device *dev, | |
628 | struct device_attribute *attr, | |
629 | char *buf) { | |
630 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
631 | int result; | |
632 | ||
633 | if (acpi_dev->pnp.str_obj == NULL) | |
634 | return 0; | |
635 | ||
636 | /* | |
637 | * The _STR object contains a Unicode identifier for a device. | |
638 | * We need to convert to utf-8 so it can be displayed. | |
639 | */ | |
640 | result = utf16s_to_utf8s( | |
641 | (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer, | |
642 | acpi_dev->pnp.str_obj->buffer.length, | |
643 | UTF16_LITTLE_ENDIAN, buf, | |
644 | PAGE_SIZE); | |
645 | ||
646 | buf[result++] = '\n'; | |
647 | ||
648 | return result; | |
649 | } | |
650 | static DEVICE_ATTR(description, 0444, description_show, NULL); | |
651 | ||
bb74ac23 YI |
652 | static ssize_t |
653 | acpi_device_sun_show(struct device *dev, struct device_attribute *attr, | |
654 | char *buf) { | |
655 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
656 | ||
657 | return sprintf(buf, "%lu\n", acpi_dev->pnp.sun); | |
658 | } | |
659 | static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL); | |
660 | ||
c713cd7f SP |
661 | static ssize_t status_show(struct device *dev, struct device_attribute *attr, |
662 | char *buf) { | |
663 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
664 | acpi_status status; | |
665 | unsigned long long sta; | |
666 | ||
667 | status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta); | |
668 | if (ACPI_FAILURE(status)) | |
669 | return -ENODEV; | |
670 | ||
671 | return sprintf(buf, "%llu\n", sta); | |
672 | } | |
673 | static DEVICE_ATTR_RO(status); | |
674 | ||
e49bd2dd | 675 | static int acpi_device_setup_files(struct acpi_device *dev) |
1da177e4 | 676 | { |
d1efe3c3 | 677 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
f883d9db | 678 | acpi_status status; |
bb74ac23 | 679 | unsigned long long sun; |
e49bd2dd | 680 | int result = 0; |
1da177e4 LT |
681 | |
682 | /* | |
e49bd2dd | 683 | * Devices gotten from FADT don't have a "path" attribute |
1da177e4 | 684 | */ |
0c526d96 | 685 | if (dev->handle) { |
e49bd2dd | 686 | result = device_create_file(&dev->dev, &dev_attr_path); |
0c526d96 | 687 | if (result) |
e49bd2dd | 688 | goto end; |
1da177e4 LT |
689 | } |
690 | ||
2b2ae7c7 TR |
691 | if (!list_empty(&dev->pnp.ids)) { |
692 | result = device_create_file(&dev->dev, &dev_attr_hid); | |
693 | if (result) | |
694 | goto end; | |
1da177e4 | 695 | |
2b2ae7c7 TR |
696 | result = device_create_file(&dev->dev, &dev_attr_modalias); |
697 | if (result) | |
698 | goto end; | |
699 | } | |
29b71a1c | 700 | |
d1efe3c3 LO |
701 | /* |
702 | * If device has _STR, 'description' file is created | |
703 | */ | |
952c63e9 | 704 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
705 | status = acpi_evaluate_object(dev->handle, "_STR", |
706 | NULL, &buffer); | |
707 | if (ACPI_FAILURE(status)) | |
708 | buffer.pointer = NULL; | |
709 | dev->pnp.str_obj = buffer.pointer; | |
710 | result = device_create_file(&dev->dev, &dev_attr_description); | |
711 | if (result) | |
712 | goto end; | |
713 | } | |
714 | ||
d4e1a692 | 715 | if (dev->pnp.type.bus_address) |
923d4a45 LZ |
716 | result = device_create_file(&dev->dev, &dev_attr_adr); |
717 | if (dev->pnp.unique_id) | |
718 | result = device_create_file(&dev->dev, &dev_attr_uid); | |
719 | ||
bb74ac23 YI |
720 | status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun); |
721 | if (ACPI_SUCCESS(status)) { | |
722 | dev->pnp.sun = (unsigned long)sun; | |
723 | result = device_create_file(&dev->dev, &dev_attr_sun); | |
724 | if (result) | |
725 | goto end; | |
726 | } else { | |
727 | dev->pnp.sun = (unsigned long)-1; | |
728 | } | |
729 | ||
c713cd7f SP |
730 | if (acpi_has_method(dev->handle, "_STA")) { |
731 | result = device_create_file(&dev->dev, &dev_attr_status); | |
732 | if (result) | |
733 | goto end; | |
734 | } | |
735 | ||
e49bd2dd ZR |
736 | /* |
737 | * If device has _EJ0, 'eject' file is created that is used to trigger | |
738 | * hot-removal function from userland. | |
739 | */ | |
952c63e9 | 740 | if (acpi_has_method(dev->handle, "_EJ0")) { |
e49bd2dd | 741 | result = device_create_file(&dev->dev, &dev_attr_eject); |
836aedb1 RW |
742 | if (result) |
743 | return result; | |
744 | } | |
745 | ||
746 | if (dev->flags.power_manageable) { | |
747 | result = device_create_file(&dev->dev, &dev_attr_power_state); | |
748 | if (result) | |
749 | return result; | |
750 | ||
751 | if (dev->power.flags.power_resources) | |
752 | result = device_create_file(&dev->dev, | |
753 | &dev_attr_real_power_state); | |
754 | } | |
755 | ||
0c526d96 | 756 | end: |
e49bd2dd | 757 | return result; |
1da177e4 LT |
758 | } |
759 | ||
f883d9db | 760 | static void acpi_device_remove_files(struct acpi_device *dev) |
1da177e4 | 761 | { |
836aedb1 RW |
762 | if (dev->flags.power_manageable) { |
763 | device_remove_file(&dev->dev, &dev_attr_power_state); | |
764 | if (dev->power.flags.power_resources) | |
765 | device_remove_file(&dev->dev, | |
766 | &dev_attr_real_power_state); | |
767 | } | |
768 | ||
f883d9db | 769 | /* |
d1efe3c3 LO |
770 | * If device has _STR, remove 'description' file |
771 | */ | |
952c63e9 | 772 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
773 | kfree(dev->pnp.str_obj); |
774 | device_remove_file(&dev->dev, &dev_attr_description); | |
775 | } | |
776 | /* | |
777 | * If device has _EJ0, remove 'eject' file. | |
f883d9db | 778 | */ |
952c63e9 | 779 | if (acpi_has_method(dev->handle, "_EJ0")) |
f883d9db | 780 | device_remove_file(&dev->dev, &dev_attr_eject); |
1da177e4 | 781 | |
952c63e9 | 782 | if (acpi_has_method(dev->handle, "_SUN")) |
bb74ac23 YI |
783 | device_remove_file(&dev->dev, &dev_attr_sun); |
784 | ||
923d4a45 LZ |
785 | if (dev->pnp.unique_id) |
786 | device_remove_file(&dev->dev, &dev_attr_uid); | |
d4e1a692 | 787 | if (dev->pnp.type.bus_address) |
923d4a45 | 788 | device_remove_file(&dev->dev, &dev_attr_adr); |
1131b938 BH |
789 | device_remove_file(&dev->dev, &dev_attr_modalias); |
790 | device_remove_file(&dev->dev, &dev_attr_hid); | |
c713cd7f SP |
791 | if (acpi_has_method(dev->handle, "_STA")) |
792 | device_remove_file(&dev->dev, &dev_attr_status); | |
0c526d96 | 793 | if (dev->handle) |
e49bd2dd | 794 | device_remove_file(&dev->dev, &dev_attr_path); |
1da177e4 | 795 | } |
1da177e4 | 796 | /* -------------------------------------------------------------------------- |
9e89dde2 | 797 | ACPI Bus operations |
1da177e4 | 798 | -------------------------------------------------------------------------- */ |
29b71a1c | 799 | |
cf761af9 MW |
800 | static const struct acpi_device_id *__acpi_match_device( |
801 | struct acpi_device *device, const struct acpi_device_id *ids) | |
29b71a1c TR |
802 | { |
803 | const struct acpi_device_id *id; | |
7f47fa6c | 804 | struct acpi_hardware_id *hwid; |
29b71a1c | 805 | |
39a0ad87 ZY |
806 | /* |
807 | * If the device is not present, it is unnecessary to load device | |
808 | * driver for it. | |
809 | */ | |
810 | if (!device->status.present) | |
cf761af9 | 811 | return NULL; |
39a0ad87 | 812 | |
7f47fa6c BH |
813 | for (id = ids; id->id[0]; id++) |
814 | list_for_each_entry(hwid, &device->pnp.ids, list) | |
815 | if (!strcmp((char *) id->id, hwid->id)) | |
cf761af9 MW |
816 | return id; |
817 | ||
818 | return NULL; | |
819 | } | |
820 | ||
821 | /** | |
822 | * acpi_match_device - Match a struct device against a given list of ACPI IDs | |
823 | * @ids: Array of struct acpi_device_id object to match against. | |
824 | * @dev: The device structure to match. | |
825 | * | |
826 | * Check if @dev has a valid ACPI handle and if there is a struct acpi_device | |
827 | * object for that handle and use that object to match against a given list of | |
828 | * device IDs. | |
829 | * | |
830 | * Return a pointer to the first matching ID on success or %NULL on failure. | |
831 | */ | |
832 | const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, | |
833 | const struct device *dev) | |
834 | { | |
835 | struct acpi_device *adev; | |
0613e1f7 | 836 | acpi_handle handle = ACPI_HANDLE(dev); |
cf761af9 | 837 | |
0613e1f7 | 838 | if (!ids || !handle || acpi_bus_get_device(handle, &adev)) |
cf761af9 MW |
839 | return NULL; |
840 | ||
841 | return __acpi_match_device(adev, ids); | |
842 | } | |
843 | EXPORT_SYMBOL_GPL(acpi_match_device); | |
29b71a1c | 844 | |
cf761af9 MW |
845 | int acpi_match_device_ids(struct acpi_device *device, |
846 | const struct acpi_device_id *ids) | |
847 | { | |
848 | return __acpi_match_device(device, ids) ? 0 : -ENOENT; | |
29b71a1c TR |
849 | } |
850 | EXPORT_SYMBOL(acpi_match_device_ids); | |
851 | ||
0b224527 RW |
852 | static void acpi_free_power_resources_lists(struct acpi_device *device) |
853 | { | |
854 | int i; | |
855 | ||
993cbe59 RW |
856 | if (device->wakeup.flags.valid) |
857 | acpi_power_resources_list_free(&device->wakeup.resources); | |
858 | ||
0b224527 RW |
859 | if (!device->flags.power_manageable) |
860 | return; | |
861 | ||
862 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { | |
863 | struct acpi_device_power_state *ps = &device->power.states[i]; | |
864 | acpi_power_resources_list_free(&ps->resources); | |
865 | } | |
7f47fa6c BH |
866 | } |
867 | ||
1890a97a | 868 | static void acpi_device_release(struct device *dev) |
1da177e4 | 869 | { |
1890a97a | 870 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1da177e4 | 871 | |
c0af4175 | 872 | acpi_free_pnp_ids(&acpi_dev->pnp); |
0b224527 | 873 | acpi_free_power_resources_lists(acpi_dev); |
1890a97a | 874 | kfree(acpi_dev); |
1da177e4 LT |
875 | } |
876 | ||
5d9464a4 | 877 | static int acpi_bus_match(struct device *dev, struct device_driver *drv) |
9e89dde2 | 878 | { |
5d9464a4 PM |
879 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
880 | struct acpi_driver *acpi_drv = to_acpi_driver(drv); | |
1da177e4 | 881 | |
209d3b17 | 882 | return acpi_dev->flags.match_driver |
805d410f | 883 | && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); |
5d9464a4 | 884 | } |
1da177e4 | 885 | |
7eff2e7a | 886 | static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 | 887 | { |
5d9464a4 | 888 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
7eff2e7a | 889 | int len; |
5d9464a4 | 890 | |
2b2ae7c7 TR |
891 | if (list_empty(&acpi_dev->pnp.ids)) |
892 | return 0; | |
893 | ||
7eff2e7a KS |
894 | if (add_uevent_var(env, "MODALIAS=")) |
895 | return -ENOMEM; | |
896 | len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], | |
897 | sizeof(env->buf) - env->buflen); | |
3d8e0090 ZR |
898 | if (len <= 0) |
899 | return len; | |
7eff2e7a | 900 | env->buflen += len; |
9e89dde2 | 901 | return 0; |
1da177e4 LT |
902 | } |
903 | ||
46ec8598 BH |
904 | static void acpi_device_notify(acpi_handle handle, u32 event, void *data) |
905 | { | |
906 | struct acpi_device *device = data; | |
907 | ||
908 | device->driver->ops.notify(device, event); | |
909 | } | |
910 | ||
911 | static acpi_status acpi_device_notify_fixed(void *data) | |
912 | { | |
913 | struct acpi_device *device = data; | |
914 | ||
53de5356 BH |
915 | /* Fixed hardware devices have no handles */ |
916 | acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); | |
46ec8598 BH |
917 | return AE_OK; |
918 | } | |
919 | ||
920 | static int acpi_device_install_notify_handler(struct acpi_device *device) | |
921 | { | |
922 | acpi_status status; | |
46ec8598 | 923 | |
ccba2a36 | 924 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 BH |
925 | status = |
926 | acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, | |
927 | acpi_device_notify_fixed, | |
928 | device); | |
ccba2a36 | 929 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 BH |
930 | status = |
931 | acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, | |
932 | acpi_device_notify_fixed, | |
933 | device); | |
934 | else | |
935 | status = acpi_install_notify_handler(device->handle, | |
936 | ACPI_DEVICE_NOTIFY, | |
937 | acpi_device_notify, | |
938 | device); | |
939 | ||
940 | if (ACPI_FAILURE(status)) | |
941 | return -EINVAL; | |
942 | return 0; | |
943 | } | |
944 | ||
945 | static void acpi_device_remove_notify_handler(struct acpi_device *device) | |
946 | { | |
ccba2a36 | 947 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 BH |
948 | acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
949 | acpi_device_notify_fixed); | |
ccba2a36 | 950 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 BH |
951 | acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, |
952 | acpi_device_notify_fixed); | |
953 | else | |
954 | acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, | |
955 | acpi_device_notify); | |
956 | } | |
957 | ||
d9e455f5 | 958 | static int acpi_device_probe(struct device *dev) |
1da177e4 | 959 | { |
5d9464a4 PM |
960 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
961 | struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); | |
962 | int ret; | |
963 | ||
24071f47 RW |
964 | if (acpi_dev->handler) |
965 | return -EINVAL; | |
966 | ||
d9e455f5 RW |
967 | if (!acpi_drv->ops.add) |
968 | return -ENOSYS; | |
46ec8598 | 969 | |
d9e455f5 RW |
970 | ret = acpi_drv->ops.add(acpi_dev); |
971 | if (ret) | |
972 | return ret; | |
46ec8598 | 973 | |
d9e455f5 RW |
974 | acpi_dev->driver = acpi_drv; |
975 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
976 | "Driver [%s] successfully bound to device [%s]\n", | |
977 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
978 | ||
979 | if (acpi_drv->ops.notify) { | |
980 | ret = acpi_device_install_notify_handler(acpi_dev); | |
981 | if (ret) { | |
982 | if (acpi_drv->ops.remove) | |
983 | acpi_drv->ops.remove(acpi_dev); | |
984 | ||
985 | acpi_dev->driver = NULL; | |
986 | acpi_dev->driver_data = NULL; | |
987 | return ret; | |
988 | } | |
5d9464a4 | 989 | } |
d9e455f5 RW |
990 | |
991 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", | |
992 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
993 | get_device(dev); | |
994 | return 0; | |
5d9464a4 | 995 | } |
1da177e4 | 996 | |
5d9464a4 PM |
997 | static int acpi_device_remove(struct device * dev) |
998 | { | |
999 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
1000 | struct acpi_driver *acpi_drv = acpi_dev->driver; | |
1001 | ||
1002 | if (acpi_drv) { | |
46ec8598 BH |
1003 | if (acpi_drv->ops.notify) |
1004 | acpi_device_remove_notify_handler(acpi_dev); | |
5d9464a4 | 1005 | if (acpi_drv->ops.remove) |
51fac838 | 1006 | acpi_drv->ops.remove(acpi_dev); |
1da177e4 | 1007 | } |
5d9464a4 | 1008 | acpi_dev->driver = NULL; |
db89b4f0 | 1009 | acpi_dev->driver_data = NULL; |
1da177e4 | 1010 | |
5d9464a4 | 1011 | put_device(dev); |
9e89dde2 ZR |
1012 | return 0; |
1013 | } | |
1da177e4 | 1014 | |
55955aad | 1015 | struct bus_type acpi_bus_type = { |
9e89dde2 | 1016 | .name = "acpi", |
5d9464a4 PM |
1017 | .match = acpi_bus_match, |
1018 | .probe = acpi_device_probe, | |
1019 | .remove = acpi_device_remove, | |
1020 | .uevent = acpi_device_uevent, | |
9e89dde2 ZR |
1021 | }; |
1022 | ||
d783156e RW |
1023 | static void acpi_device_del(struct acpi_device *device) |
1024 | { | |
1025 | mutex_lock(&acpi_device_lock); | |
1026 | if (device->parent) | |
1027 | list_del(&device->node); | |
1028 | ||
1029 | list_del(&device->wakeup_list); | |
1030 | mutex_unlock(&acpi_device_lock); | |
1031 | ||
1032 | acpi_power_add_remove_device(device, false); | |
1033 | acpi_device_remove_files(device); | |
1034 | if (device->remove) | |
1035 | device->remove(device); | |
1036 | ||
1037 | device_del(&device->dev); | |
1038 | } | |
1039 | ||
1040 | static LIST_HEAD(acpi_device_del_list); | |
1041 | static DEFINE_MUTEX(acpi_device_del_lock); | |
1042 | ||
1043 | static void acpi_device_del_work_fn(struct work_struct *work_not_used) | |
1044 | { | |
1045 | for (;;) { | |
1046 | struct acpi_device *adev; | |
1047 | ||
1048 | mutex_lock(&acpi_device_del_lock); | |
1049 | ||
1050 | if (list_empty(&acpi_device_del_list)) { | |
1051 | mutex_unlock(&acpi_device_del_lock); | |
1052 | break; | |
1053 | } | |
1054 | adev = list_first_entry(&acpi_device_del_list, | |
1055 | struct acpi_device, del_list); | |
1056 | list_del(&adev->del_list); | |
1057 | ||
1058 | mutex_unlock(&acpi_device_del_lock); | |
1059 | ||
1060 | acpi_device_del(adev); | |
1061 | /* | |
1062 | * Drop references to all power resources that might have been | |
1063 | * used by the device. | |
1064 | */ | |
1065 | acpi_power_transition(adev, ACPI_STATE_D3_COLD); | |
1066 | put_device(&adev->dev); | |
1067 | } | |
1068 | } | |
1069 | ||
1070 | /** | |
1071 | * acpi_scan_drop_device - Drop an ACPI device object. | |
1072 | * @handle: Handle of an ACPI namespace node, not used. | |
1073 | * @context: Address of the ACPI device object to drop. | |
1074 | * | |
1075 | * This is invoked by acpi_ns_delete_node() during the removal of the ACPI | |
1076 | * namespace node the device object pointed to by @context is attached to. | |
1077 | * | |
1078 | * The unregistration is carried out asynchronously to avoid running | |
1079 | * acpi_device_del() under the ACPICA's namespace mutex and the list is used to | |
1080 | * ensure the correct ordering (the device objects must be unregistered in the | |
1081 | * same order in which the corresponding namespace nodes are deleted). | |
1082 | */ | |
1083 | static void acpi_scan_drop_device(acpi_handle handle, void *context) | |
caf5c03f | 1084 | { |
d783156e RW |
1085 | static DECLARE_WORK(work, acpi_device_del_work_fn); |
1086 | struct acpi_device *adev = context; | |
1087 | ||
1088 | mutex_lock(&acpi_device_del_lock); | |
1089 | ||
1090 | /* | |
1091 | * Use the ACPI hotplug workqueue which is ordered, so this work item | |
1092 | * won't run after any hotplug work items submitted subsequently. That | |
1093 | * prevents attempts to register device objects identical to those being | |
1094 | * deleted from happening concurrently (such attempts result from | |
1095 | * hotplug events handled via the ACPI hotplug workqueue). It also will | |
1096 | * run after all of the work items submitted previosuly, which helps | |
1097 | * those work items to ensure that they are not accessing stale device | |
1098 | * objects. | |
1099 | */ | |
1100 | if (list_empty(&acpi_device_del_list)) | |
1101 | acpi_queue_hotplug_work(&work); | |
1102 | ||
1103 | list_add_tail(&adev->del_list, &acpi_device_del_list); | |
1104 | /* Make acpi_ns_validate_handle() return NULL for this handle. */ | |
1105 | adev->handle = INVALID_ACPI_HANDLE; | |
1106 | ||
1107 | mutex_unlock(&acpi_device_del_lock); | |
caf5c03f RW |
1108 | } |
1109 | ||
78ea4639 RW |
1110 | static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device, |
1111 | void (*callback)(void *)) | |
caf5c03f RW |
1112 | { |
1113 | acpi_status status; | |
1114 | ||
1115 | if (!device) | |
1116 | return -EINVAL; | |
1117 | ||
78ea4639 RW |
1118 | status = acpi_get_data_full(handle, acpi_scan_drop_device, |
1119 | (void **)device, callback); | |
caf5c03f RW |
1120 | if (ACPI_FAILURE(status) || !*device) { |
1121 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", | |
1122 | handle)); | |
1123 | return -ENODEV; | |
1124 | } | |
1125 | return 0; | |
1126 | } | |
78ea4639 RW |
1127 | |
1128 | int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) | |
1129 | { | |
1130 | return acpi_get_device_data(handle, device, NULL); | |
1131 | } | |
6585925b | 1132 | EXPORT_SYMBOL(acpi_bus_get_device); |
caf5c03f | 1133 | |
78ea4639 RW |
1134 | static void get_acpi_device(void *dev) |
1135 | { | |
1136 | if (dev) | |
1137 | get_device(&((struct acpi_device *)dev)->dev); | |
1138 | } | |
1139 | ||
1140 | struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle) | |
1141 | { | |
1142 | struct acpi_device *adev = NULL; | |
1143 | ||
1144 | acpi_get_device_data(handle, &adev, get_acpi_device); | |
1145 | return adev; | |
1146 | } | |
1147 | ||
1148 | void acpi_bus_put_acpi_device(struct acpi_device *adev) | |
1149 | { | |
1150 | put_device(&adev->dev); | |
1151 | } | |
1152 | ||
cf860be6 RW |
1153 | int acpi_device_add(struct acpi_device *device, |
1154 | void (*release)(struct device *)) | |
1da177e4 | 1155 | { |
4be44fcd | 1156 | int result; |
e49bd2dd ZR |
1157 | struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; |
1158 | int found = 0; | |
66b7ed40 | 1159 | |
d43e167d RW |
1160 | if (device->handle) { |
1161 | acpi_status status; | |
1162 | ||
d783156e | 1163 | status = acpi_attach_data(device->handle, acpi_scan_drop_device, |
d43e167d RW |
1164 | device); |
1165 | if (ACPI_FAILURE(status)) { | |
1166 | acpi_handle_err(device->handle, | |
1167 | "Unable to attach device data\n"); | |
1168 | return -ENODEV; | |
1169 | } | |
1170 | } | |
1171 | ||
9e89dde2 ZR |
1172 | /* |
1173 | * Linkage | |
1174 | * ------- | |
1175 | * Link this device to its parent and siblings. | |
1176 | */ | |
1177 | INIT_LIST_HEAD(&device->children); | |
1178 | INIT_LIST_HEAD(&device->node); | |
9e89dde2 | 1179 | INIT_LIST_HEAD(&device->wakeup_list); |
1033f904 | 1180 | INIT_LIST_HEAD(&device->physical_node_list); |
d783156e | 1181 | INIT_LIST_HEAD(&device->del_list); |
1033f904 | 1182 | mutex_init(&device->physical_node_lock); |
1da177e4 | 1183 | |
e49bd2dd ZR |
1184 | new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); |
1185 | if (!new_bus_id) { | |
d43e167d RW |
1186 | pr_err(PREFIX "Memory allocation error\n"); |
1187 | result = -ENOMEM; | |
1188 | goto err_detach; | |
1da177e4 | 1189 | } |
e49bd2dd | 1190 | |
9090589d | 1191 | mutex_lock(&acpi_device_lock); |
e49bd2dd ZR |
1192 | /* |
1193 | * Find suitable bus_id and instance number in acpi_bus_id_list | |
1194 | * If failed, create one and link it into acpi_bus_id_list | |
1195 | */ | |
1196 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { | |
1131b938 BH |
1197 | if (!strcmp(acpi_device_bus_id->bus_id, |
1198 | acpi_device_hid(device))) { | |
1199 | acpi_device_bus_id->instance_no++; | |
e49bd2dd ZR |
1200 | found = 1; |
1201 | kfree(new_bus_id); | |
1202 | break; | |
1203 | } | |
1da177e4 | 1204 | } |
0c526d96 | 1205 | if (!found) { |
e49bd2dd | 1206 | acpi_device_bus_id = new_bus_id; |
1131b938 | 1207 | strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); |
e49bd2dd ZR |
1208 | acpi_device_bus_id->instance_no = 0; |
1209 | list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); | |
1da177e4 | 1210 | } |
0794469d | 1211 | dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); |
1da177e4 | 1212 | |
33b57150 | 1213 | if (device->parent) |
9e89dde2 | 1214 | list_add_tail(&device->node, &device->parent->children); |
33b57150 | 1215 | |
9e89dde2 ZR |
1216 | if (device->wakeup.flags.valid) |
1217 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); | |
9090589d | 1218 | mutex_unlock(&acpi_device_lock); |
1da177e4 | 1219 | |
1890a97a | 1220 | if (device->parent) |
66b7ed40 | 1221 | device->dev.parent = &device->parent->dev; |
1890a97a | 1222 | device->dev.bus = &acpi_bus_type; |
82c7d5ef | 1223 | device->dev.release = release; |
cf860be6 | 1224 | result = device_add(&device->dev); |
0c526d96 | 1225 | if (result) { |
8b12b922 | 1226 | dev_err(&device->dev, "Error registering device\n"); |
d43e167d | 1227 | goto err; |
1da177e4 | 1228 | } |
1da177e4 | 1229 | |
e49bd2dd | 1230 | result = acpi_device_setup_files(device); |
0c526d96 | 1231 | if (result) |
0794469d KS |
1232 | printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", |
1233 | dev_name(&device->dev)); | |
1da177e4 | 1234 | |
1da177e4 | 1235 | return 0; |
d43e167d RW |
1236 | |
1237 | err: | |
9090589d | 1238 | mutex_lock(&acpi_device_lock); |
33b57150 | 1239 | if (device->parent) |
e49bd2dd | 1240 | list_del(&device->node); |
e49bd2dd | 1241 | list_del(&device->wakeup_list); |
9090589d | 1242 | mutex_unlock(&acpi_device_lock); |
d43e167d RW |
1243 | |
1244 | err_detach: | |
d783156e | 1245 | acpi_detach_data(device->handle, acpi_scan_drop_device); |
e49bd2dd | 1246 | return result; |
1da177e4 LT |
1247 | } |
1248 | ||
9e89dde2 ZR |
1249 | /* -------------------------------------------------------------------------- |
1250 | Driver Management | |
1251 | -------------------------------------------------------------------------- */ | |
9e89dde2 ZR |
1252 | /** |
1253 | * acpi_bus_register_driver - register a driver with the ACPI bus | |
1254 | * @driver: driver being registered | |
1255 | * | |
1256 | * Registers a driver with the ACPI bus. Searches the namespace for all | |
1257 | * devices that match the driver's criteria and binds. Returns zero for | |
1258 | * success or a negative error status for failure. | |
1259 | */ | |
1260 | int acpi_bus_register_driver(struct acpi_driver *driver) | |
1da177e4 | 1261 | { |
1890a97a | 1262 | int ret; |
1da177e4 | 1263 | |
9e89dde2 ZR |
1264 | if (acpi_disabled) |
1265 | return -ENODEV; | |
1890a97a PM |
1266 | driver->drv.name = driver->name; |
1267 | driver->drv.bus = &acpi_bus_type; | |
1268 | driver->drv.owner = driver->owner; | |
1da177e4 | 1269 | |
1890a97a PM |
1270 | ret = driver_register(&driver->drv); |
1271 | return ret; | |
9e89dde2 | 1272 | } |
1da177e4 | 1273 | |
9e89dde2 ZR |
1274 | EXPORT_SYMBOL(acpi_bus_register_driver); |
1275 | ||
1276 | /** | |
b27b14ce | 1277 | * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus |
9e89dde2 ZR |
1278 | * @driver: driver to unregister |
1279 | * | |
1280 | * Unregisters a driver with the ACPI bus. Searches the namespace for all | |
1281 | * devices that match the driver's criteria and unbinds. | |
1282 | */ | |
1283 | void acpi_bus_unregister_driver(struct acpi_driver *driver) | |
1284 | { | |
1890a97a | 1285 | driver_unregister(&driver->drv); |
9e89dde2 ZR |
1286 | } |
1287 | ||
1288 | EXPORT_SYMBOL(acpi_bus_unregister_driver); | |
1289 | ||
9e89dde2 ZR |
1290 | /* -------------------------------------------------------------------------- |
1291 | Device Enumeration | |
1292 | -------------------------------------------------------------------------- */ | |
5c478f49 BH |
1293 | static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) |
1294 | { | |
456de893 | 1295 | struct acpi_device *device = NULL; |
5c478f49 | 1296 | acpi_status status; |
5c478f49 BH |
1297 | |
1298 | /* | |
1299 | * Fixed hardware devices do not appear in the namespace and do not | |
1300 | * have handles, but we fabricate acpi_devices for them, so we have | |
1301 | * to deal with them specially. | |
1302 | */ | |
456de893 | 1303 | if (!handle) |
5c478f49 BH |
1304 | return acpi_root; |
1305 | ||
1306 | do { | |
1307 | status = acpi_get_parent(handle, &handle); | |
5c478f49 | 1308 | if (ACPI_FAILURE(status)) |
456de893 RW |
1309 | return status == AE_NULL_ENTRY ? NULL : acpi_root; |
1310 | } while (acpi_bus_get_device(handle, &device)); | |
1311 | return device; | |
5c478f49 BH |
1312 | } |
1313 | ||
9e89dde2 ZR |
1314 | acpi_status |
1315 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) | |
1316 | { | |
1317 | acpi_status status; | |
1318 | acpi_handle tmp; | |
1319 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
1320 | union acpi_object *obj; | |
1321 | ||
1322 | status = acpi_get_handle(handle, "_EJD", &tmp); | |
1323 | if (ACPI_FAILURE(status)) | |
1324 | return status; | |
1325 | ||
1326 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); | |
1327 | if (ACPI_SUCCESS(status)) { | |
1328 | obj = buffer.pointer; | |
3b5fee59 HM |
1329 | status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, |
1330 | ejd); | |
9e89dde2 ZR |
1331 | kfree(buffer.pointer); |
1332 | } | |
1333 | return status; | |
1334 | } | |
1335 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); | |
1336 | ||
e88c9c60 RW |
1337 | static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle, |
1338 | struct acpi_device_wakeup *wakeup) | |
9e89dde2 | 1339 | { |
b581a7f9 RW |
1340 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1341 | union acpi_object *package = NULL; | |
9e89dde2 | 1342 | union acpi_object *element = NULL; |
b581a7f9 | 1343 | acpi_status status; |
e88c9c60 | 1344 | int err = -ENODATA; |
9e89dde2 | 1345 | |
b581a7f9 | 1346 | if (!wakeup) |
e88c9c60 | 1347 | return -EINVAL; |
9e89dde2 | 1348 | |
993cbe59 | 1349 | INIT_LIST_HEAD(&wakeup->resources); |
9e89dde2 | 1350 | |
b581a7f9 RW |
1351 | /* _PRW */ |
1352 | status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); | |
1353 | if (ACPI_FAILURE(status)) { | |
1354 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); | |
e88c9c60 | 1355 | return err; |
b581a7f9 RW |
1356 | } |
1357 | ||
1358 | package = (union acpi_object *)buffer.pointer; | |
1359 | ||
e88c9c60 | 1360 | if (!package || package->package.count < 2) |
b581a7f9 | 1361 | goto out; |
b581a7f9 | 1362 | |
9e89dde2 | 1363 | element = &(package->package.elements[0]); |
e88c9c60 | 1364 | if (!element) |
b581a7f9 | 1365 | goto out; |
e88c9c60 | 1366 | |
9e89dde2 ZR |
1367 | if (element->type == ACPI_TYPE_PACKAGE) { |
1368 | if ((element->package.count < 2) || | |
1369 | (element->package.elements[0].type != | |
1370 | ACPI_TYPE_LOCAL_REFERENCE) | |
e88c9c60 | 1371 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
b581a7f9 | 1372 | goto out; |
e88c9c60 | 1373 | |
b581a7f9 | 1374 | wakeup->gpe_device = |
9e89dde2 | 1375 | element->package.elements[0].reference.handle; |
b581a7f9 | 1376 | wakeup->gpe_number = |
9e89dde2 ZR |
1377 | (u32) element->package.elements[1].integer.value; |
1378 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
b581a7f9 RW |
1379 | wakeup->gpe_device = NULL; |
1380 | wakeup->gpe_number = element->integer.value; | |
1381 | } else { | |
b581a7f9 RW |
1382 | goto out; |
1383 | } | |
9e89dde2 ZR |
1384 | |
1385 | element = &(package->package.elements[1]); | |
e88c9c60 | 1386 | if (element->type != ACPI_TYPE_INTEGER) |
b581a7f9 | 1387 | goto out; |
e88c9c60 | 1388 | |
b581a7f9 | 1389 | wakeup->sleep_state = element->integer.value; |
9e89dde2 | 1390 | |
e88c9c60 RW |
1391 | err = acpi_extract_power_resources(package, 2, &wakeup->resources); |
1392 | if (err) | |
b581a7f9 | 1393 | goto out; |
9e89dde2 | 1394 | |
0596a52b RW |
1395 | if (!list_empty(&wakeup->resources)) { |
1396 | int sleep_state; | |
9e89dde2 | 1397 | |
b5d667eb RW |
1398 | err = acpi_power_wakeup_list_init(&wakeup->resources, |
1399 | &sleep_state); | |
1400 | if (err) { | |
1401 | acpi_handle_warn(handle, "Retrieving current states " | |
1402 | "of wakeup power resources failed\n"); | |
1403 | acpi_power_resources_list_free(&wakeup->resources); | |
1404 | goto out; | |
1405 | } | |
0596a52b RW |
1406 | if (sleep_state < wakeup->sleep_state) { |
1407 | acpi_handle_warn(handle, "Overriding _PRW sleep state " | |
1408 | "(S%d) by S%d from power resources\n", | |
1409 | (int)wakeup->sleep_state, sleep_state); | |
1410 | wakeup->sleep_state = sleep_state; | |
1411 | } | |
1412 | } | |
bba63a29 | 1413 | acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number); |
9874647b | 1414 | |
b581a7f9 RW |
1415 | out: |
1416 | kfree(buffer.pointer); | |
e88c9c60 | 1417 | return err; |
1da177e4 LT |
1418 | } |
1419 | ||
f517709d | 1420 | static void acpi_bus_set_run_wake_flags(struct acpi_device *device) |
1da177e4 | 1421 | { |
29b71a1c | 1422 | struct acpi_device_id button_device_ids[] = { |
29b71a1c | 1423 | {"PNP0C0C", 0}, |
b7e38304 | 1424 | {"PNP0C0D", 0}, |
29b71a1c TR |
1425 | {"PNP0C0E", 0}, |
1426 | {"", 0}, | |
1427 | }; | |
f517709d RW |
1428 | acpi_status status; |
1429 | acpi_event_status event_status; | |
1430 | ||
b67ea761 | 1431 | device->wakeup.flags.notifier_present = 0; |
f517709d RW |
1432 | |
1433 | /* Power button, Lid switch always enable wakeup */ | |
1434 | if (!acpi_match_device_ids(device, button_device_ids)) { | |
1435 | device->wakeup.flags.run_wake = 1; | |
b7e38304 ZR |
1436 | if (!acpi_match_device_ids(device, &button_device_ids[1])) { |
1437 | /* Do not use Lid/sleep button for S5 wakeup */ | |
1438 | if (device->wakeup.sleep_state == ACPI_STATE_S5) | |
1439 | device->wakeup.sleep_state = ACPI_STATE_S4; | |
1440 | } | |
f2b56bc8 | 1441 | device_set_wakeup_capable(&device->dev, true); |
f517709d RW |
1442 | return; |
1443 | } | |
1444 | ||
e8e18c95 RW |
1445 | status = acpi_get_gpe_status(device->wakeup.gpe_device, |
1446 | device->wakeup.gpe_number, | |
1447 | &event_status); | |
f517709d RW |
1448 | if (status == AE_OK) |
1449 | device->wakeup.flags.run_wake = | |
1450 | !!(event_status & ACPI_EVENT_FLAG_HANDLE); | |
1451 | } | |
1452 | ||
d57d09a4 | 1453 | static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
f517709d | 1454 | { |
e88c9c60 | 1455 | int err; |
29b71a1c | 1456 | |
d57d09a4 | 1457 | /* Presence of _PRW indicates wake capable */ |
952c63e9 | 1458 | if (!acpi_has_method(device->handle, "_PRW")) |
d57d09a4 RW |
1459 | return; |
1460 | ||
e88c9c60 RW |
1461 | err = acpi_bus_extract_wakeup_device_power_package(device->handle, |
1462 | &device->wakeup); | |
1463 | if (err) { | |
1464 | dev_err(&device->dev, "_PRW evaluation error: %d\n", err); | |
d57d09a4 | 1465 | return; |
9e89dde2 | 1466 | } |
1da177e4 | 1467 | |
9e89dde2 | 1468 | device->wakeup.flags.valid = 1; |
9b83ccd2 | 1469 | device->wakeup.prepare_count = 0; |
f517709d | 1470 | acpi_bus_set_run_wake_flags(device); |
729b2bdb ZY |
1471 | /* Call _PSW/_DSW object to disable its ability to wake the sleeping |
1472 | * system for the ACPI device with the _PRW object. | |
1473 | * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. | |
1474 | * So it is necessary to call _DSW object first. Only when it is not | |
1475 | * present will the _PSW object used. | |
1476 | */ | |
e88c9c60 RW |
1477 | err = acpi_device_sleep_wake(device, 0, 0, 0); |
1478 | if (err) | |
77e76609 RW |
1479 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1480 | "error in _DSW or _PSW evaluation\n")); | |
1da177e4 | 1481 | } |
1da177e4 | 1482 | |
f33ce568 RW |
1483 | static void acpi_bus_init_power_state(struct acpi_device *device, int state) |
1484 | { | |
1485 | struct acpi_device_power_state *ps = &device->power.states[state]; | |
ef85bdbe RW |
1486 | char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; |
1487 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
f33ce568 | 1488 | acpi_status status; |
bf325f95 | 1489 | |
f33ce568 RW |
1490 | INIT_LIST_HEAD(&ps->resources); |
1491 | ||
ef85bdbe RW |
1492 | /* Evaluate "_PRx" to get referenced power resources */ |
1493 | status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); | |
1494 | if (ACPI_SUCCESS(status)) { | |
1495 | union acpi_object *package = buffer.pointer; | |
1496 | ||
1497 | if (buffer.length && package | |
1498 | && package->type == ACPI_TYPE_PACKAGE | |
1499 | && package->package.count) { | |
e88c9c60 RW |
1500 | int err = acpi_extract_power_resources(package, 0, |
1501 | &ps->resources); | |
1502 | if (!err) | |
ef85bdbe | 1503 | device->power.flags.power_resources = 1; |
f33ce568 | 1504 | } |
ef85bdbe | 1505 | ACPI_FREE(buffer.pointer); |
f33ce568 RW |
1506 | } |
1507 | ||
1508 | /* Evaluate "_PSx" to see if we can do explicit sets */ | |
ef85bdbe | 1509 | pathname[2] = 'S'; |
952c63e9 | 1510 | if (acpi_has_method(device->handle, pathname)) |
f33ce568 RW |
1511 | ps->flags.explicit_set = 1; |
1512 | ||
1513 | /* | |
1514 | * State is valid if there are means to put the device into it. | |
1515 | * D3hot is only valid if _PR3 present. | |
1516 | */ | |
ef85bdbe | 1517 | if (!list_empty(&ps->resources) |
f33ce568 RW |
1518 | || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) { |
1519 | ps->flags.valid = 1; | |
1520 | ps->flags.os_accessible = 1; | |
1521 | } | |
1522 | ||
1523 | ps->power = -1; /* Unknown - driver assigned */ | |
1524 | ps->latency = -1; /* Unknown - driver assigned */ | |
1525 | } | |
1526 | ||
d43e167d | 1527 | static void acpi_bus_get_power_flags(struct acpi_device *device) |
1da177e4 | 1528 | { |
8bc5053b | 1529 | u32 i; |
1a365616 | 1530 | |
d43e167d | 1531 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ |
952c63e9 JL |
1532 | if (!acpi_has_method(device->handle, "_PS0") && |
1533 | !acpi_has_method(device->handle, "_PR0")) | |
1534 | return; | |
1a365616 | 1535 | |
d43e167d | 1536 | device->flags.power_manageable = 1; |
4be44fcd | 1537 | |
9e89dde2 ZR |
1538 | /* |
1539 | * Power Management Flags | |
1540 | */ | |
952c63e9 | 1541 | if (acpi_has_method(device->handle, "_PSC")) |
9e89dde2 | 1542 | device->power.flags.explicit_get = 1; |
952c63e9 | 1543 | if (acpi_has_method(device->handle, "_IRC")) |
9e89dde2 | 1544 | device->power.flags.inrush_current = 1; |
1da177e4 | 1545 | |
9e89dde2 ZR |
1546 | /* |
1547 | * Enumerate supported power management states | |
1548 | */ | |
f33ce568 RW |
1549 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) |
1550 | acpi_bus_init_power_state(device, i); | |
bf325f95 | 1551 | |
0b224527 | 1552 | INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); |
1da177e4 | 1553 | |
9e89dde2 ZR |
1554 | /* Set defaults for D0 and D3 states (always valid) */ |
1555 | device->power.states[ACPI_STATE_D0].flags.valid = 1; | |
1556 | device->power.states[ACPI_STATE_D0].power = 100; | |
8ad928d5 RW |
1557 | device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; |
1558 | device->power.states[ACPI_STATE_D3_COLD].power = 0; | |
c8f7a62c | 1559 | |
5c7dd710 RW |
1560 | /* Set D3cold's explicit_set flag if _PS3 exists. */ |
1561 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set) | |
1562 | device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1; | |
1563 | ||
1399dfcd AL |
1564 | /* Presence of _PS3 or _PRx means we can put the device into D3 cold */ |
1565 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set || | |
1566 | device->power.flags.power_resources) | |
1567 | device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1; | |
1568 | ||
b3785492 RW |
1569 | if (acpi_bus_init_power(device)) { |
1570 | acpi_free_power_resources_lists(device); | |
1571 | device->flags.power_manageable = 0; | |
1572 | } | |
9e89dde2 | 1573 | } |
c8f7a62c | 1574 | |
d43e167d | 1575 | static void acpi_bus_get_flags(struct acpi_device *device) |
1da177e4 | 1576 | { |
1da177e4 | 1577 | /* Presence of _STA indicates 'dynamic_status' */ |
952c63e9 | 1578 | if (acpi_has_method(device->handle, "_STA")) |
1da177e4 LT |
1579 | device->flags.dynamic_status = 1; |
1580 | ||
1da177e4 | 1581 | /* Presence of _RMV indicates 'removable' */ |
952c63e9 | 1582 | if (acpi_has_method(device->handle, "_RMV")) |
1da177e4 LT |
1583 | device->flags.removable = 1; |
1584 | ||
1585 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ | |
952c63e9 JL |
1586 | if (acpi_has_method(device->handle, "_EJD") || |
1587 | acpi_has_method(device->handle, "_EJ0")) | |
1da177e4 | 1588 | device->flags.ejectable = 1; |
1da177e4 LT |
1589 | } |
1590 | ||
c7bcb4e9 | 1591 | static void acpi_device_get_busid(struct acpi_device *device) |
1da177e4 | 1592 | { |
4be44fcd LB |
1593 | char bus_id[5] = { '?', 0 }; |
1594 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; | |
1595 | int i = 0; | |
1da177e4 LT |
1596 | |
1597 | /* | |
1598 | * Bus ID | |
1599 | * ------ | |
1600 | * The device's Bus ID is simply the object name. | |
1601 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? | |
1602 | */ | |
859ac9a4 | 1603 | if (ACPI_IS_ROOT_DEVICE(device)) { |
1da177e4 | 1604 | strcpy(device->pnp.bus_id, "ACPI"); |
859ac9a4 BH |
1605 | return; |
1606 | } | |
1607 | ||
1608 | switch (device->device_type) { | |
1da177e4 LT |
1609 | case ACPI_BUS_TYPE_POWER_BUTTON: |
1610 | strcpy(device->pnp.bus_id, "PWRF"); | |
1611 | break; | |
1612 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
1613 | strcpy(device->pnp.bus_id, "SLPF"); | |
1614 | break; | |
1615 | default: | |
66b7ed40 | 1616 | acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); |
1da177e4 LT |
1617 | /* Clean up trailing underscores (if any) */ |
1618 | for (i = 3; i > 1; i--) { | |
1619 | if (bus_id[i] == '_') | |
1620 | bus_id[i] = '\0'; | |
1621 | else | |
1622 | break; | |
1623 | } | |
1624 | strcpy(device->pnp.bus_id, bus_id); | |
1625 | break; | |
1626 | } | |
1627 | } | |
1628 | ||
ebf4df8d JL |
1629 | /* |
1630 | * acpi_ata_match - see if an acpi object is an ATA device | |
1631 | * | |
1632 | * If an acpi object has one of the ACPI ATA methods defined, | |
1633 | * then we can safely call it an ATA device. | |
1634 | */ | |
1635 | bool acpi_ata_match(acpi_handle handle) | |
1636 | { | |
1637 | return acpi_has_method(handle, "_GTF") || | |
1638 | acpi_has_method(handle, "_GTM") || | |
1639 | acpi_has_method(handle, "_STM") || | |
1640 | acpi_has_method(handle, "_SDD"); | |
1641 | } | |
1642 | ||
54735266 | 1643 | /* |
d4e1a692 | 1644 | * acpi_bay_match - see if an acpi object is an ejectable driver bay |
54735266 ZR |
1645 | * |
1646 | * If an acpi object is ejectable and has one of the ACPI ATA methods defined, | |
1647 | * then we can safely call it an ejectable drive bay | |
1648 | */ | |
ebf4df8d | 1649 | bool acpi_bay_match(acpi_handle handle) |
d4e1a692 | 1650 | { |
54735266 ZR |
1651 | acpi_handle phandle; |
1652 | ||
952c63e9 | 1653 | if (!acpi_has_method(handle, "_EJ0")) |
ebf4df8d JL |
1654 | return false; |
1655 | if (acpi_ata_match(handle)) | |
1656 | return true; | |
1657 | if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) | |
1658 | return false; | |
54735266 | 1659 | |
ebf4df8d | 1660 | return acpi_ata_match(phandle); |
54735266 ZR |
1661 | } |
1662 | ||
3620f2f2 | 1663 | /* |
d4e1a692 | 1664 | * acpi_dock_match - see if an acpi object has a _DCK method |
3620f2f2 | 1665 | */ |
ebf4df8d | 1666 | bool acpi_dock_match(acpi_handle handle) |
3620f2f2 | 1667 | { |
ebf4df8d | 1668 | return acpi_has_method(handle, "_DCK"); |
3620f2f2 FS |
1669 | } |
1670 | ||
620e112c | 1671 | const char *acpi_device_hid(struct acpi_device *device) |
15b8dd53 | 1672 | { |
7f47fa6c | 1673 | struct acpi_hardware_id *hid; |
15b8dd53 | 1674 | |
2b2ae7c7 TR |
1675 | if (list_empty(&device->pnp.ids)) |
1676 | return dummy_hid; | |
1677 | ||
7f47fa6c BH |
1678 | hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); |
1679 | return hid->id; | |
1680 | } | |
1681 | EXPORT_SYMBOL(acpi_device_hid); | |
15b8dd53 | 1682 | |
d4e1a692 | 1683 | static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) |
7f47fa6c BH |
1684 | { |
1685 | struct acpi_hardware_id *id; | |
15b8dd53 | 1686 | |
7f47fa6c BH |
1687 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
1688 | if (!id) | |
1689 | return; | |
15b8dd53 | 1690 | |
581de59e | 1691 | id->id = kstrdup(dev_id, GFP_KERNEL); |
7f47fa6c BH |
1692 | if (!id->id) { |
1693 | kfree(id); | |
1694 | return; | |
15b8dd53 BM |
1695 | } |
1696 | ||
d4e1a692 TK |
1697 | list_add_tail(&id->list, &pnp->ids); |
1698 | pnp->type.hardware_id = 1; | |
15b8dd53 BM |
1699 | } |
1700 | ||
222e82ac DW |
1701 | /* |
1702 | * Old IBM workstations have a DSDT bug wherein the SMBus object | |
1703 | * lacks the SMBUS01 HID and the methods do not have the necessary "_" | |
1704 | * prefix. Work around this. | |
1705 | */ | |
ebf4df8d | 1706 | static bool acpi_ibm_smbus_match(acpi_handle handle) |
222e82ac | 1707 | { |
ebf4df8d JL |
1708 | char node_name[ACPI_PATH_SEGMENT_LENGTH]; |
1709 | struct acpi_buffer path = { sizeof(node_name), node_name }; | |
222e82ac DW |
1710 | |
1711 | if (!dmi_name_in_vendors("IBM")) | |
ebf4df8d | 1712 | return false; |
222e82ac DW |
1713 | |
1714 | /* Look for SMBS object */ | |
ebf4df8d JL |
1715 | if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || |
1716 | strcmp("SMBS", path.pointer)) | |
1717 | return false; | |
222e82ac DW |
1718 | |
1719 | /* Does it have the necessary (but misnamed) methods? */ | |
952c63e9 JL |
1720 | if (acpi_has_method(handle, "SBI") && |
1721 | acpi_has_method(handle, "SBR") && | |
1722 | acpi_has_method(handle, "SBW")) | |
ebf4df8d JL |
1723 | return true; |
1724 | ||
1725 | return false; | |
222e82ac DW |
1726 | } |
1727 | ||
c0af4175 TK |
1728 | static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, |
1729 | int device_type) | |
1da177e4 | 1730 | { |
4be44fcd | 1731 | acpi_status status; |
57f3674f | 1732 | struct acpi_device_info *info; |
78e25fef | 1733 | struct acpi_pnp_device_id_list *cid_list; |
7f47fa6c | 1734 | int i; |
1da177e4 | 1735 | |
c0af4175 | 1736 | switch (device_type) { |
1da177e4 | 1737 | case ACPI_BUS_TYPE_DEVICE: |
c0af4175 TK |
1738 | if (handle == ACPI_ROOT_OBJECT) { |
1739 | acpi_add_id(pnp, ACPI_SYSTEM_HID); | |
859ac9a4 BH |
1740 | break; |
1741 | } | |
1742 | ||
c0af4175 | 1743 | status = acpi_get_object_info(handle, &info); |
1da177e4 | 1744 | if (ACPI_FAILURE(status)) { |
c0af4175 TK |
1745 | pr_err(PREFIX "%s: Error reading device info\n", |
1746 | __func__); | |
1da177e4 LT |
1747 | return; |
1748 | } | |
1749 | ||
1da177e4 | 1750 | if (info->valid & ACPI_VALID_HID) |
c0af4175 | 1751 | acpi_add_id(pnp, info->hardware_id.string); |
57f3674f | 1752 | if (info->valid & ACPI_VALID_CID) { |
15b8dd53 | 1753 | cid_list = &info->compatible_id_list; |
57f3674f | 1754 | for (i = 0; i < cid_list->count; i++) |
c0af4175 | 1755 | acpi_add_id(pnp, cid_list->ids[i].string); |
57f3674f | 1756 | } |
1da177e4 | 1757 | if (info->valid & ACPI_VALID_ADR) { |
c0af4175 TK |
1758 | pnp->bus_address = info->address; |
1759 | pnp->type.bus_address = 1; | |
1da177e4 | 1760 | } |
ccf78040 | 1761 | if (info->valid & ACPI_VALID_UID) |
c0af4175 | 1762 | pnp->unique_id = kstrdup(info->unique_id.string, |
ccf78040 | 1763 | GFP_KERNEL); |
ae843332 | 1764 | |
a83893ae BH |
1765 | kfree(info); |
1766 | ||
57f3674f BH |
1767 | /* |
1768 | * Some devices don't reliably have _HIDs & _CIDs, so add | |
1769 | * synthetic HIDs to make sure drivers can find them. | |
1770 | */ | |
c0af4175 TK |
1771 | if (acpi_is_video_device(handle)) |
1772 | acpi_add_id(pnp, ACPI_VIDEO_HID); | |
ebf4df8d | 1773 | else if (acpi_bay_match(handle)) |
c0af4175 | 1774 | acpi_add_id(pnp, ACPI_BAY_HID); |
ebf4df8d | 1775 | else if (acpi_dock_match(handle)) |
c0af4175 | 1776 | acpi_add_id(pnp, ACPI_DOCK_HID); |
ebf4df8d | 1777 | else if (acpi_ibm_smbus_match(handle)) |
c0af4175 TK |
1778 | acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); |
1779 | else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) { | |
1780 | acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */ | |
1781 | strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); | |
1782 | strcpy(pnp->device_class, ACPI_BUS_CLASS); | |
b7b30de5 | 1783 | } |
54735266 | 1784 | |
1da177e4 LT |
1785 | break; |
1786 | case ACPI_BUS_TYPE_POWER: | |
c0af4175 | 1787 | acpi_add_id(pnp, ACPI_POWER_HID); |
1da177e4 LT |
1788 | break; |
1789 | case ACPI_BUS_TYPE_PROCESSOR: | |
c0af4175 | 1790 | acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); |
1da177e4 | 1791 | break; |
1da177e4 | 1792 | case ACPI_BUS_TYPE_THERMAL: |
c0af4175 | 1793 | acpi_add_id(pnp, ACPI_THERMAL_HID); |
1da177e4 LT |
1794 | break; |
1795 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
c0af4175 | 1796 | acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); |
1da177e4 LT |
1797 | break; |
1798 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
c0af4175 | 1799 | acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); |
1da177e4 LT |
1800 | break; |
1801 | } | |
1da177e4 LT |
1802 | } |
1803 | ||
c0af4175 TK |
1804 | void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) |
1805 | { | |
1806 | struct acpi_hardware_id *id, *tmp; | |
1807 | ||
1808 | list_for_each_entry_safe(id, tmp, &pnp->ids, list) { | |
1809 | kfree(id->id); | |
1810 | kfree(id); | |
1811 | } | |
1812 | kfree(pnp->unique_id); | |
1813 | } | |
1814 | ||
82c7d5ef RW |
1815 | void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, |
1816 | int type, unsigned long long sta) | |
1da177e4 | 1817 | { |
d43e167d RW |
1818 | INIT_LIST_HEAD(&device->pnp.ids); |
1819 | device->device_type = type; | |
1820 | device->handle = handle; | |
1821 | device->parent = acpi_bus_get_parent(handle); | |
25db115b | 1822 | acpi_set_device_status(device, sta); |
d43e167d | 1823 | acpi_device_get_busid(device); |
c0af4175 | 1824 | acpi_set_pnp_ids(handle, &device->pnp, type); |
d43e167d | 1825 | acpi_bus_get_flags(device); |
2c0d4fe0 | 1826 | device->flags.match_driver = false; |
202317a5 RW |
1827 | device->flags.initialized = true; |
1828 | device->flags.visited = false; | |
cf860be6 RW |
1829 | device_initialize(&device->dev); |
1830 | dev_set_uevent_suppress(&device->dev, true); | |
1831 | } | |
bc3b0772 | 1832 | |
cf860be6 RW |
1833 | void acpi_device_add_finalize(struct acpi_device *device) |
1834 | { | |
1835 | dev_set_uevent_suppress(&device->dev, false); | |
1836 | kobject_uevent(&device->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
1837 | } |
1838 | ||
5c478f49 BH |
1839 | static int acpi_add_single_object(struct acpi_device **child, |
1840 | acpi_handle handle, int type, | |
2c0d4fe0 | 1841 | unsigned long long sta) |
1da177e4 | 1842 | { |
77c24888 BH |
1843 | int result; |
1844 | struct acpi_device *device; | |
29aaefa6 | 1845 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1da177e4 | 1846 | |
36bcbec7 | 1847 | device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
1da177e4 | 1848 | if (!device) { |
6468463a | 1849 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
d550d98d | 1850 | return -ENOMEM; |
1da177e4 | 1851 | } |
1da177e4 | 1852 | |
d43e167d RW |
1853 | acpi_init_device_object(device, handle, type, sta); |
1854 | acpi_bus_get_power_flags(device); | |
d57d09a4 | 1855 | acpi_bus_get_wakeup_device_flags(device); |
1da177e4 | 1856 | |
cf860be6 | 1857 | result = acpi_device_add(device, acpi_device_release); |
d43e167d | 1858 | if (result) { |
718fb0de | 1859 | acpi_device_release(&device->dev); |
d43e167d RW |
1860 | return result; |
1861 | } | |
1da177e4 | 1862 | |
d43e167d | 1863 | acpi_power_add_remove_device(device, true); |
cf860be6 | 1864 | acpi_device_add_finalize(device); |
d43e167d RW |
1865 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
1866 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n", | |
1867 | dev_name(&device->dev), (char *) buffer.pointer, | |
1868 | device->parent ? dev_name(&device->parent->dev) : "(null)")); | |
1869 | kfree(buffer.pointer); | |
1870 | *child = device; | |
1871 | return 0; | |
bf325f95 RW |
1872 | } |
1873 | ||
778cbc1d BH |
1874 | static int acpi_bus_type_and_status(acpi_handle handle, int *type, |
1875 | unsigned long long *sta) | |
1da177e4 | 1876 | { |
778cbc1d BH |
1877 | acpi_status status; |
1878 | acpi_object_type acpi_type; | |
1da177e4 | 1879 | |
778cbc1d | 1880 | status = acpi_get_type(handle, &acpi_type); |
51a85faf | 1881 | if (ACPI_FAILURE(status)) |
778cbc1d | 1882 | return -ENODEV; |
4be44fcd | 1883 | |
778cbc1d | 1884 | switch (acpi_type) { |
51a85faf BH |
1885 | case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ |
1886 | case ACPI_TYPE_DEVICE: | |
778cbc1d BH |
1887 | *type = ACPI_BUS_TYPE_DEVICE; |
1888 | status = acpi_bus_get_status_handle(handle, sta); | |
1889 | if (ACPI_FAILURE(status)) | |
1890 | return -ENODEV; | |
51a85faf BH |
1891 | break; |
1892 | case ACPI_TYPE_PROCESSOR: | |
778cbc1d BH |
1893 | *type = ACPI_BUS_TYPE_PROCESSOR; |
1894 | status = acpi_bus_get_status_handle(handle, sta); | |
1895 | if (ACPI_FAILURE(status)) | |
1896 | return -ENODEV; | |
51a85faf BH |
1897 | break; |
1898 | case ACPI_TYPE_THERMAL: | |
778cbc1d BH |
1899 | *type = ACPI_BUS_TYPE_THERMAL; |
1900 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1901 | break; |
1902 | case ACPI_TYPE_POWER: | |
778cbc1d BH |
1903 | *type = ACPI_BUS_TYPE_POWER; |
1904 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1905 | break; |
1906 | default: | |
778cbc1d | 1907 | return -ENODEV; |
51a85faf | 1908 | } |
1da177e4 | 1909 | |
778cbc1d BH |
1910 | return 0; |
1911 | } | |
1912 | ||
202317a5 RW |
1913 | bool acpi_device_is_present(struct acpi_device *adev) |
1914 | { | |
1915 | if (adev->status.present || adev->status.functional) | |
1916 | return true; | |
1917 | ||
1918 | adev->flags.initialized = false; | |
1919 | return false; | |
1920 | } | |
1921 | ||
4b59cc1f RW |
1922 | static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, |
1923 | char *idstr, | |
1924 | const struct acpi_device_id **matchid) | |
1925 | { | |
1926 | const struct acpi_device_id *devid; | |
1927 | ||
1928 | for (devid = handler->ids; devid->id[0]; devid++) | |
1929 | if (!strcmp((char *)devid->id, idstr)) { | |
1930 | if (matchid) | |
1931 | *matchid = devid; | |
1932 | ||
1933 | return true; | |
1934 | } | |
1935 | ||
1936 | return false; | |
1937 | } | |
1938 | ||
6b772e8f TK |
1939 | static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr, |
1940 | const struct acpi_device_id **matchid) | |
1941 | { | |
1942 | struct acpi_scan_handler *handler; | |
1943 | ||
1944 | list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) | |
1945 | if (acpi_scan_handler_matching(handler, idstr, matchid)) | |
1946 | return handler; | |
1947 | ||
1948 | return NULL; | |
1949 | } | |
1950 | ||
3f8055c3 RW |
1951 | void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) |
1952 | { | |
3f8055c3 RW |
1953 | if (!!hotplug->enabled == !!val) |
1954 | return; | |
1955 | ||
1956 | mutex_lock(&acpi_scan_lock); | |
1957 | ||
1958 | hotplug->enabled = val; | |
3f8055c3 RW |
1959 | |
1960 | mutex_unlock(&acpi_scan_lock); | |
1961 | } | |
1962 | ||
3c2cc7ff | 1963 | static void acpi_scan_init_hotplug(struct acpi_device *adev) |
a33ec399 | 1964 | { |
6b772e8f | 1965 | struct acpi_hardware_id *hwid; |
a33ec399 | 1966 | |
3c2cc7ff RW |
1967 | list_for_each_entry(hwid, &adev->pnp.ids, list) { |
1968 | struct acpi_scan_handler *handler; | |
a33ec399 | 1969 | |
6b772e8f | 1970 | handler = acpi_scan_match_handler(hwid->id, NULL); |
1a699476 RW |
1971 | if (handler) { |
1972 | adev->flags.hotplug_notify = true; | |
1973 | break; | |
1974 | } | |
3c2cc7ff | 1975 | } |
a33ec399 RW |
1976 | } |
1977 | ||
e3863094 RW |
1978 | static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, |
1979 | void *not_used, void **return_value) | |
778cbc1d | 1980 | { |
805d410f | 1981 | struct acpi_device *device = NULL; |
778cbc1d BH |
1982 | int type; |
1983 | unsigned long long sta; | |
1984 | int result; | |
1985 | ||
4002bf38 RW |
1986 | acpi_bus_get_device(handle, &device); |
1987 | if (device) | |
1988 | goto out; | |
1989 | ||
778cbc1d BH |
1990 | result = acpi_bus_type_and_status(handle, &type, &sta); |
1991 | if (result) | |
1992 | return AE_OK; | |
1993 | ||
82c7d5ef RW |
1994 | if (type == ACPI_BUS_TYPE_POWER) { |
1995 | acpi_add_power_resource(handle); | |
1996 | return AE_OK; | |
1997 | } | |
1998 | ||
2c0d4fe0 | 1999 | acpi_add_single_object(&device, handle, type, sta); |
e3b87f8a | 2000 | if (!device) |
51a85faf | 2001 | return AE_CTRL_DEPTH; |
1da177e4 | 2002 | |
3c2cc7ff RW |
2003 | acpi_scan_init_hotplug(device); |
2004 | ||
4002bf38 | 2005 | out: |
51a85faf BH |
2006 | if (!*return_value) |
2007 | *return_value = device; | |
805d410f | 2008 | |
51a85faf BH |
2009 | return AE_OK; |
2010 | } | |
3fb02738 | 2011 | |
c5698074 | 2012 | static int acpi_scan_attach_handler(struct acpi_device *device) |
ca589f94 | 2013 | { |
c5698074 RW |
2014 | struct acpi_hardware_id *hwid; |
2015 | int ret = 0; | |
ca589f94 | 2016 | |
c5698074 | 2017 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
87b85b3c | 2018 | const struct acpi_device_id *devid; |
c5698074 | 2019 | struct acpi_scan_handler *handler; |
ca589f94 | 2020 | |
c5698074 RW |
2021 | handler = acpi_scan_match_handler(hwid->id, &devid); |
2022 | if (handler) { | |
87b85b3c RW |
2023 | ret = handler->attach(device, devid); |
2024 | if (ret > 0) { | |
2025 | device->handler = handler; | |
c5698074 | 2026 | break; |
87b85b3c | 2027 | } else if (ret < 0) { |
c5698074 | 2028 | break; |
87b85b3c | 2029 | } |
ca589f94 RW |
2030 | } |
2031 | } | |
2032 | return ret; | |
2033 | } | |
2034 | ||
2c22e652 | 2035 | static void acpi_bus_attach(struct acpi_device *device) |
51a85faf | 2036 | { |
2c22e652 | 2037 | struct acpi_device *child; |
ca589f94 | 2038 | int ret; |
3fb02738 | 2039 | |
2c22e652 | 2040 | acpi_bus_get_status(device); |
202317a5 | 2041 | /* Skip devices that are not present. */ |
2c22e652 RW |
2042 | if (!acpi_device_is_present(device)) { |
2043 | device->flags.visited = false; | |
2044 | return; | |
2045 | } | |
3a391a39 | 2046 | if (device->handler) |
2c22e652 | 2047 | goto ok; |
3a391a39 | 2048 | |
202317a5 RW |
2049 | if (!device->flags.initialized) { |
2050 | acpi_bus_update_power(device, NULL); | |
2051 | device->flags.initialized = true; | |
2052 | } | |
2c22e652 | 2053 | device->flags.visited = false; |
ca589f94 | 2054 | ret = acpi_scan_attach_handler(device); |
6931007c | 2055 | if (ret < 0) |
2c22e652 | 2056 | return; |
6931007c RW |
2057 | |
2058 | device->flags.match_driver = true; | |
2c22e652 RW |
2059 | if (!ret) { |
2060 | ret = device_attach(&device->dev); | |
2061 | if (ret < 0) | |
2062 | return; | |
2063 | } | |
202317a5 | 2064 | device->flags.visited = true; |
202317a5 | 2065 | |
2c22e652 RW |
2066 | ok: |
2067 | list_for_each_entry(child, &device->children, node) | |
2068 | acpi_bus_attach(child); | |
1da177e4 | 2069 | } |
1da177e4 | 2070 | |
636458de | 2071 | /** |
b8bd759a | 2072 | * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. |
636458de | 2073 | * @handle: Root of the namespace scope to scan. |
7779688f | 2074 | * |
636458de RW |
2075 | * Scan a given ACPI tree (probably recently hot-plugged) and create and add |
2076 | * found devices. | |
7779688f | 2077 | * |
636458de RW |
2078 | * If no devices were found, -ENODEV is returned, but it does not mean that |
2079 | * there has been a real error. There just have been no suitable ACPI objects | |
2080 | * in the table trunk from which the kernel could create a device and add an | |
2081 | * appropriate driver. | |
3757b948 RW |
2082 | * |
2083 | * Must be called under acpi_scan_lock. | |
7779688f | 2084 | */ |
b8bd759a | 2085 | int acpi_bus_scan(acpi_handle handle) |
3fb02738 | 2086 | { |
b8bd759a | 2087 | void *device = NULL; |
3fb02738 | 2088 | |
b8bd759a RW |
2089 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device))) |
2090 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
2091 | acpi_bus_check_add, NULL, NULL, &device); | |
3fb02738 | 2092 | |
2c22e652 RW |
2093 | if (device) { |
2094 | acpi_bus_attach(device); | |
2095 | return 0; | |
05404d8f | 2096 | } |
2c22e652 | 2097 | return -ENODEV; |
3fb02738 | 2098 | } |
2c22e652 | 2099 | EXPORT_SYMBOL(acpi_bus_scan); |
1da177e4 | 2100 | |
3757b948 | 2101 | /** |
2c22e652 RW |
2102 | * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects. |
2103 | * @adev: Root of the ACPI namespace scope to walk. | |
3757b948 RW |
2104 | * |
2105 | * Must be called under acpi_scan_lock. | |
2106 | */ | |
2c22e652 | 2107 | void acpi_bus_trim(struct acpi_device *adev) |
1da177e4 | 2108 | { |
2c22e652 RW |
2109 | struct acpi_scan_handler *handler = adev->handler; |
2110 | struct acpi_device *child; | |
2111 | ||
2112 | list_for_each_entry_reverse(child, &adev->children, node) | |
2113 | acpi_bus_trim(child); | |
2114 | ||
a951c773 | 2115 | adev->flags.match_driver = false; |
2c22e652 RW |
2116 | if (handler) { |
2117 | if (handler->detach) | |
2118 | handler->detach(adev); | |
2119 | ||
2120 | adev->handler = NULL; | |
2121 | } else { | |
2122 | device_release_driver(&adev->dev); | |
2123 | } | |
05404d8f | 2124 | /* |
2c22e652 RW |
2125 | * Most likely, the device is going away, so put it into D3cold before |
2126 | * that. | |
05404d8f | 2127 | */ |
2c22e652 RW |
2128 | acpi_device_set_power(adev, ACPI_STATE_D3_COLD); |
2129 | adev->flags.initialized = false; | |
2130 | adev->flags.visited = false; | |
1da177e4 | 2131 | } |
ceaba663 KA |
2132 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
2133 | ||
e8b945c9 | 2134 | static int acpi_bus_scan_fixed(void) |
1da177e4 | 2135 | { |
4be44fcd | 2136 | int result = 0; |
c4168bff | 2137 | |
1da177e4 LT |
2138 | /* |
2139 | * Enumerate all fixed-feature devices. | |
2140 | */ | |
2c0d4fe0 RW |
2141 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { |
2142 | struct acpi_device *device = NULL; | |
2143 | ||
5c478f49 | 2144 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2145 | ACPI_BUS_TYPE_POWER_BUTTON, |
2c0d4fe0 RW |
2146 | ACPI_STA_DEFAULT); |
2147 | if (result) | |
2148 | return result; | |
2149 | ||
88346167 | 2150 | device->flags.match_driver = true; |
2c0d4fe0 RW |
2151 | result = device_attach(&device->dev); |
2152 | if (result < 0) | |
2153 | return result; | |
2154 | ||
c10d7a13 | 2155 | device_init_wakeup(&device->dev, true); |
3fb02738 | 2156 | } |
1da177e4 | 2157 | |
2c0d4fe0 RW |
2158 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { |
2159 | struct acpi_device *device = NULL; | |
2160 | ||
5c478f49 | 2161 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2162 | ACPI_BUS_TYPE_SLEEP_BUTTON, |
2c0d4fe0 RW |
2163 | ACPI_STA_DEFAULT); |
2164 | if (result) | |
2165 | return result; | |
2166 | ||
88346167 | 2167 | device->flags.match_driver = true; |
2c0d4fe0 | 2168 | result = device_attach(&device->dev); |
3fb02738 | 2169 | } |
1da177e4 | 2170 | |
2c0d4fe0 | 2171 | return result < 0 ? result : 0; |
1da177e4 LT |
2172 | } |
2173 | ||
e747f274 | 2174 | int __init acpi_scan_init(void) |
1da177e4 LT |
2175 | { |
2176 | int result; | |
1da177e4 | 2177 | |
5b327265 PM |
2178 | result = bus_register(&acpi_bus_type); |
2179 | if (result) { | |
2180 | /* We don't want to quit even if we failed to add suspend/resume */ | |
2181 | printk(KERN_ERR PREFIX "Could not register bus type\n"); | |
2182 | } | |
2183 | ||
92ef2a25 | 2184 | acpi_pci_root_init(); |
4daeaf68 | 2185 | acpi_pci_link_init(); |
ac212b69 | 2186 | acpi_processor_init(); |
141a297b | 2187 | acpi_platform_init(); |
f58b082a | 2188 | acpi_lpss_init(); |
2fa97feb | 2189 | acpi_cmos_rtc_init(); |
737f1a9f | 2190 | acpi_container_init(); |
0a347644 | 2191 | acpi_memory_hotplug_init(); |
94add0f8 | 2192 | acpi_dock_init(); |
97d9a9e9 | 2193 | |
3757b948 | 2194 | mutex_lock(&acpi_scan_lock); |
1da177e4 LT |
2195 | /* |
2196 | * Enumerate devices in the ACPI namespace. | |
2197 | */ | |
0cd6ac52 RW |
2198 | result = acpi_bus_scan(ACPI_ROOT_OBJECT); |
2199 | if (result) | |
3757b948 | 2200 | goto out; |
1da177e4 | 2201 | |
0cd6ac52 | 2202 | result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); |
1da177e4 | 2203 | if (result) |
3757b948 | 2204 | goto out; |
1da177e4 | 2205 | |
b8bd759a RW |
2206 | result = acpi_bus_scan_fixed(); |
2207 | if (result) { | |
202317a5 RW |
2208 | acpi_detach_data(acpi_root->handle, acpi_scan_drop_device); |
2209 | acpi_device_del(acpi_root); | |
2210 | put_device(&acpi_root->dev); | |
3757b948 | 2211 | goto out; |
b8bd759a | 2212 | } |
1da177e4 | 2213 | |
b8bd759a | 2214 | acpi_update_all_gpes(); |
3757b948 RW |
2215 | |
2216 | out: | |
2217 | mutex_unlock(&acpi_scan_lock); | |
2218 | return result; | |
1da177e4 | 2219 | } |