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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 LT |
43 | LIST_HEAD(acpi_wakeup_device_list); |
44 | ||
e49bd2dd | 45 | struct acpi_device_bus_id{ |
bb095854 | 46 | char bus_id[15]; |
e49bd2dd ZR |
47 | unsigned int instance_no; |
48 | struct list_head node; | |
1da177e4 | 49 | }; |
29b71a1c | 50 | |
3757b948 RW |
51 | void acpi_scan_lock_acquire(void) |
52 | { | |
53 | mutex_lock(&acpi_scan_lock); | |
54 | } | |
55 | EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire); | |
56 | ||
57 | void acpi_scan_lock_release(void) | |
58 | { | |
59 | mutex_unlock(&acpi_scan_lock); | |
60 | } | |
61 | EXPORT_SYMBOL_GPL(acpi_scan_lock_release); | |
62 | ||
ca589f94 RW |
63 | int acpi_scan_add_handler(struct acpi_scan_handler *handler) |
64 | { | |
65 | if (!handler || !handler->attach) | |
66 | return -EINVAL; | |
67 | ||
68 | list_add_tail(&handler->list_node, &acpi_scan_handlers_list); | |
69 | return 0; | |
70 | } | |
71 | ||
3f8055c3 RW |
72 | int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler, |
73 | const char *hotplug_profile_name) | |
74 | { | |
75 | int error; | |
76 | ||
77 | error = acpi_scan_add_handler(handler); | |
78 | if (error) | |
79 | return error; | |
80 | ||
81 | acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name); | |
82 | return 0; | |
83 | } | |
84 | ||
29b71a1c TR |
85 | /* |
86 | * Creates hid/cid(s) string needed for modalias and uevent | |
87 | * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: | |
88 | * char *modalias: "acpi:IBM0001:ACPI0001" | |
89 | */ | |
b3e572d2 AB |
90 | static int create_modalias(struct acpi_device *acpi_dev, char *modalias, |
91 | int size) | |
92 | { | |
29b71a1c | 93 | int len; |
5c9fcb5d | 94 | int count; |
7f47fa6c | 95 | struct acpi_hardware_id *id; |
29b71a1c | 96 | |
2b2ae7c7 TR |
97 | if (list_empty(&acpi_dev->pnp.ids)) |
98 | return 0; | |
99 | ||
5c9fcb5d | 100 | len = snprintf(modalias, size, "acpi:"); |
29b71a1c TR |
101 | size -= len; |
102 | ||
7f47fa6c BH |
103 | list_for_each_entry(id, &acpi_dev->pnp.ids, list) { |
104 | count = snprintf(&modalias[len], size, "%s:", id->id); | |
5c9fcb5d ZR |
105 | if (count < 0 || count >= size) |
106 | return -EINVAL; | |
107 | len += count; | |
108 | size -= count; | |
109 | } | |
110 | ||
29b71a1c TR |
111 | modalias[len] = '\0'; |
112 | return len; | |
113 | } | |
114 | ||
115 | static ssize_t | |
116 | acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
117 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
118 | int len; | |
119 | ||
120 | /* Device has no HID and no CID or string is >1024 */ | |
121 | len = create_modalias(acpi_dev, buf, 1024); | |
122 | if (len <= 0) | |
123 | return 0; | |
124 | buf[len++] = '\n'; | |
125 | return len; | |
126 | } | |
127 | static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); | |
128 | ||
caa73ea1 | 129 | bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent) |
d22ddcbc RW |
130 | { |
131 | struct acpi_device_physical_node *pn; | |
132 | bool offline = true; | |
133 | ||
134 | mutex_lock(&adev->physical_node_lock); | |
135 | ||
136 | list_for_each_entry(pn, &adev->physical_node_list, node) | |
137 | if (device_supports_offline(pn->dev) && !pn->dev->offline) { | |
caa73ea1 RW |
138 | if (uevent) |
139 | kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE); | |
140 | ||
d22ddcbc RW |
141 | offline = false; |
142 | break; | |
143 | } | |
144 | ||
145 | mutex_unlock(&adev->physical_node_lock); | |
146 | return offline; | |
147 | } | |
148 | ||
7f28ddec RW |
149 | static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data, |
150 | void **ret_p) | |
683058e3 RW |
151 | { |
152 | struct acpi_device *device = NULL; | |
153 | struct acpi_device_physical_node *pn; | |
303bfdb1 | 154 | bool second_pass = (bool)data; |
683058e3 RW |
155 | acpi_status status = AE_OK; |
156 | ||
157 | if (acpi_bus_get_device(handle, &device)) | |
158 | return AE_OK; | |
159 | ||
7f28ddec RW |
160 | if (device->handler && !device->handler->hotplug.enabled) { |
161 | *ret_p = &device->dev; | |
162 | return AE_SUPPORT; | |
163 | } | |
164 | ||
683058e3 RW |
165 | mutex_lock(&device->physical_node_lock); |
166 | ||
167 | list_for_each_entry(pn, &device->physical_node_list, node) { | |
168 | int ret; | |
169 | ||
303bfdb1 RW |
170 | if (second_pass) { |
171 | /* Skip devices offlined by the first pass. */ | |
172 | if (pn->put_online) | |
173 | continue; | |
174 | } else { | |
175 | pn->put_online = false; | |
176 | } | |
683058e3 RW |
177 | ret = device_offline(pn->dev); |
178 | if (acpi_force_hot_remove) | |
179 | continue; | |
180 | ||
303bfdb1 RW |
181 | if (ret >= 0) { |
182 | pn->put_online = !ret; | |
183 | } else { | |
184 | *ret_p = pn->dev; | |
185 | if (second_pass) { | |
186 | status = AE_ERROR; | |
187 | break; | |
188 | } | |
683058e3 | 189 | } |
683058e3 RW |
190 | } |
191 | ||
192 | mutex_unlock(&device->physical_node_lock); | |
193 | ||
194 | return status; | |
195 | } | |
196 | ||
7f28ddec RW |
197 | static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data, |
198 | void **ret_p) | |
683058e3 RW |
199 | { |
200 | struct acpi_device *device = NULL; | |
201 | struct acpi_device_physical_node *pn; | |
202 | ||
203 | if (acpi_bus_get_device(handle, &device)) | |
204 | return AE_OK; | |
205 | ||
206 | mutex_lock(&device->physical_node_lock); | |
207 | ||
208 | list_for_each_entry(pn, &device->physical_node_list, node) | |
209 | if (pn->put_online) { | |
210 | device_online(pn->dev); | |
211 | pn->put_online = false; | |
212 | } | |
213 | ||
214 | mutex_unlock(&device->physical_node_lock); | |
215 | ||
216 | return AE_OK; | |
217 | } | |
218 | ||
d22ddcbc | 219 | static int acpi_scan_try_to_offline(struct acpi_device *device) |
1da177e4 | 220 | { |
5993c467 | 221 | acpi_handle handle = device->handle; |
d22ddcbc | 222 | struct device *errdev = NULL; |
a33ec399 | 223 | acpi_status status; |
f058cdf4 | 224 | |
303bfdb1 RW |
225 | /* |
226 | * Carry out two passes here and ignore errors in the first pass, | |
227 | * because if the devices in question are memory blocks and | |
228 | * CONFIG_MEMCG is set, one of the blocks may hold data structures | |
229 | * that the other blocks depend on, but it is not known in advance which | |
230 | * block holds them. | |
231 | * | |
232 | * If the first pass is successful, the second one isn't needed, though. | |
233 | */ | |
7f28ddec RW |
234 | status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
235 | NULL, acpi_bus_offline, (void *)false, | |
236 | (void **)&errdev); | |
237 | if (status == AE_SUPPORT) { | |
238 | dev_warn(errdev, "Offline disabled.\n"); | |
239 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
240 | acpi_bus_online, NULL, NULL, NULL); | |
7f28ddec RW |
241 | return -EPERM; |
242 | } | |
243 | acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev); | |
303bfdb1 RW |
244 | if (errdev) { |
245 | errdev = NULL; | |
683058e3 | 246 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
7f28ddec RW |
247 | NULL, acpi_bus_offline, (void *)true, |
248 | (void **)&errdev); | |
303bfdb1 | 249 | if (!errdev || acpi_force_hot_remove) |
7f28ddec RW |
250 | acpi_bus_offline(handle, 0, (void *)true, |
251 | (void **)&errdev); | |
303bfdb1 RW |
252 | |
253 | if (errdev && !acpi_force_hot_remove) { | |
254 | dev_warn(errdev, "Offline failed.\n"); | |
7f28ddec | 255 | acpi_bus_online(handle, 0, NULL, NULL); |
303bfdb1 | 256 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, |
7f28ddec RW |
257 | ACPI_UINT32_MAX, acpi_bus_online, |
258 | NULL, NULL, NULL); | |
303bfdb1 RW |
259 | return -EBUSY; |
260 | } | |
683058e3 | 261 | } |
d22ddcbc RW |
262 | return 0; |
263 | } | |
264 | ||
265 | static int acpi_scan_hot_remove(struct acpi_device *device) | |
266 | { | |
267 | acpi_handle handle = device->handle; | |
268 | unsigned long long sta; | |
269 | acpi_status status; | |
270 | ||
271 | if (device->handler->hotplug.demand_offline && !acpi_force_hot_remove) { | |
caa73ea1 | 272 | if (!acpi_scan_is_offline(device, true)) |
d22ddcbc RW |
273 | return -EBUSY; |
274 | } else { | |
275 | int error = acpi_scan_try_to_offline(device); | |
276 | if (error) | |
277 | return error; | |
278 | } | |
683058e3 | 279 | |
26d46867 | 280 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
0794469d | 281 | "Hot-removing device %s...\n", dev_name(&device->dev))); |
26d46867 | 282 | |
bfee26db | 283 | acpi_bus_trim(device); |
683058e3 | 284 | |
7d2421f8 | 285 | acpi_evaluate_lck(handle, 0); |
1da177e4 LT |
286 | /* |
287 | * TBD: _EJD support. | |
288 | */ | |
7d2421f8 JL |
289 | status = acpi_evaluate_ej0(handle); |
290 | if (status == AE_NOT_FOUND) | |
291 | return -ENODEV; | |
292 | else if (ACPI_FAILURE(status)) | |
293 | return -EIO; | |
1da177e4 | 294 | |
882fd12e TK |
295 | /* |
296 | * Verify if eject was indeed successful. If not, log an error | |
297 | * message. No need to call _OST since _EJ0 call was made OK. | |
298 | */ | |
299 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
300 | if (ACPI_FAILURE(status)) { | |
301 | acpi_handle_warn(handle, | |
302 | "Status check after eject failed (0x%x)\n", status); | |
303 | } else if (sta & ACPI_STA_DEVICE_ENABLED) { | |
304 | acpi_handle_warn(handle, | |
305 | "Eject incomplete - status 0x%llx\n", sta); | |
306 | } | |
307 | ||
a33ec399 RW |
308 | return 0; |
309 | } | |
1da177e4 | 310 | |
443fc820 RW |
311 | static int acpi_scan_device_not_present(struct acpi_device *adev) |
312 | { | |
313 | if (!acpi_device_enumerated(adev)) { | |
314 | dev_warn(&adev->dev, "Still not present\n"); | |
315 | return -EALREADY; | |
316 | } | |
317 | acpi_bus_trim(adev); | |
318 | return 0; | |
319 | } | |
320 | ||
c27b2c33 | 321 | static int acpi_scan_device_check(struct acpi_device *adev) |
a33ec399 | 322 | { |
f943db40 | 323 | int error; |
a33ec399 | 324 | |
443fc820 RW |
325 | acpi_bus_get_status(adev); |
326 | if (adev->status.present || adev->status.functional) { | |
327 | /* | |
328 | * This function is only called for device objects for which | |
329 | * matching scan handlers exist. The only situation in which | |
330 | * the scan handler is not attached to this device object yet | |
331 | * is when the device has just appeared (either it wasn't | |
332 | * present at all before or it was removed and then added | |
333 | * again). | |
334 | */ | |
335 | if (adev->handler) { | |
336 | dev_warn(&adev->dev, "Already enumerated\n"); | |
337 | return -EALREADY; | |
338 | } | |
339 | error = acpi_bus_scan(adev->handle); | |
340 | if (error) { | |
341 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
342 | return error; | |
343 | } | |
344 | if (!adev->handler) { | |
345 | dev_warn(&adev->dev, "Enumeration failure\n"); | |
346 | error = -ENODEV; | |
347 | } | |
348 | } else { | |
349 | error = acpi_scan_device_not_present(adev); | |
350 | } | |
351 | return error; | |
352 | } | |
353 | ||
354 | static int acpi_scan_bus_check(struct acpi_device *adev) | |
355 | { | |
356 | struct acpi_scan_handler *handler = adev->handler; | |
357 | struct acpi_device *child; | |
358 | int error; | |
359 | ||
360 | acpi_bus_get_status(adev); | |
361 | if (!(adev->status.present || adev->status.functional)) { | |
362 | acpi_scan_device_not_present(adev); | |
363 | return 0; | |
364 | } | |
365 | if (handler && handler->hotplug.scan_dependent) | |
366 | return handler->hotplug.scan_dependent(adev); | |
367 | ||
c27b2c33 RW |
368 | error = acpi_bus_scan(adev->handle); |
369 | if (error) { | |
370 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
371 | return error; | |
372 | } | |
443fc820 RW |
373 | list_for_each_entry(child, &adev->children, node) { |
374 | error = acpi_scan_bus_check(child); | |
375 | if (error) | |
376 | return error; | |
c27b2c33 RW |
377 | } |
378 | return 0; | |
a33ec399 RW |
379 | } |
380 | ||
3338db00 | 381 | static void acpi_device_hotplug(void *data, u32 src) |
a33ec399 | 382 | { |
a33ec399 | 383 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
c27b2c33 | 384 | struct acpi_device *adev = data; |
a33ec399 RW |
385 | int error; |
386 | ||
683058e3 | 387 | lock_device_hotplug(); |
e0ae8fee | 388 | mutex_lock(&acpi_scan_lock); |
a33ec399 | 389 | |
c27b2c33 RW |
390 | /* |
391 | * The device object's ACPI handle cannot become invalid as long as we | |
392 | * are holding acpi_scan_lock, but it may have become invalid before | |
393 | * that lock was acquired. | |
394 | */ | |
395 | if (adev->handle == INVALID_ACPI_HANDLE) | |
a33ec399 | 396 | goto out; |
c27b2c33 RW |
397 | |
398 | switch (src) { | |
399 | case ACPI_NOTIFY_BUS_CHECK: | |
443fc820 | 400 | error = acpi_scan_bus_check(adev); |
c27b2c33 RW |
401 | break; |
402 | case ACPI_NOTIFY_DEVICE_CHECK: | |
443fc820 | 403 | error = acpi_scan_device_check(adev); |
c27b2c33 RW |
404 | break; |
405 | case ACPI_NOTIFY_EJECT_REQUEST: | |
406 | case ACPI_OST_EC_OSPM_EJECT: | |
407 | error = acpi_scan_hot_remove(adev); | |
408 | break; | |
409 | default: | |
410 | error = -EINVAL; | |
411 | break; | |
a33ec399 | 412 | } |
c27b2c33 RW |
413 | if (!error) |
414 | ost_code = ACPI_OST_SC_SUCCESS; | |
a33ec399 RW |
415 | |
416 | out: | |
c27b2c33 RW |
417 | acpi_evaluate_hotplug_ost(adev->handle, src, ost_code, NULL); |
418 | put_device(&adev->dev); | |
a33ec399 | 419 | mutex_unlock(&acpi_scan_lock); |
e0ae8fee | 420 | unlock_device_hotplug(); |
a33ec399 RW |
421 | } |
422 | ||
2cbb14fb | 423 | static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) |
a33ec399 | 424 | { |
1ceaba05 | 425 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
2cbb14fb | 426 | struct acpi_scan_handler *handler = data; |
a3b1b1ef | 427 | struct acpi_device *adev; |
a33ec399 RW |
428 | acpi_status status; |
429 | ||
c27b2c33 RW |
430 | if (acpi_bus_get_device(handle, &adev)) |
431 | goto err_out; | |
432 | ||
a33ec399 RW |
433 | switch (type) { |
434 | case ACPI_NOTIFY_BUS_CHECK: | |
435 | acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); | |
a33ec399 RW |
436 | break; |
437 | case ACPI_NOTIFY_DEVICE_CHECK: | |
438 | acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); | |
a33ec399 RW |
439 | break; |
440 | case ACPI_NOTIFY_EJECT_REQUEST: | |
441 | acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); | |
1ceaba05 RW |
442 | if (!handler->hotplug.enabled) { |
443 | acpi_handle_err(handle, "Eject disabled\n"); | |
444 | ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; | |
445 | goto err_out; | |
446 | } | |
c27b2c33 RW |
447 | acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, |
448 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); | |
449 | break; | |
a33ec399 RW |
450 | default: |
451 | /* non-hotplug event; possibly handled by other handler */ | |
452 | return; | |
453 | } | |
c27b2c33 RW |
454 | get_device(&adev->dev); |
455 | status = acpi_hotplug_execute(acpi_device_hotplug, adev, type); | |
a3b1b1ef RW |
456 | if (ACPI_SUCCESS(status)) |
457 | return; | |
a33ec399 | 458 | |
c27b2c33 RW |
459 | put_device(&adev->dev); |
460 | ||
a3b1b1ef | 461 | err_out: |
1ceaba05 | 462 | acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); |
1da177e4 LT |
463 | } |
464 | ||
836aedb1 RW |
465 | static ssize_t real_power_state_show(struct device *dev, |
466 | struct device_attribute *attr, char *buf) | |
467 | { | |
468 | struct acpi_device *adev = to_acpi_device(dev); | |
469 | int state; | |
470 | int ret; | |
471 | ||
472 | ret = acpi_device_get_power(adev, &state); | |
473 | if (ret) | |
474 | return ret; | |
475 | ||
476 | return sprintf(buf, "%s\n", acpi_power_state_string(state)); | |
477 | } | |
478 | ||
479 | static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL); | |
480 | ||
481 | static ssize_t power_state_show(struct device *dev, | |
482 | struct device_attribute *attr, char *buf) | |
483 | { | |
484 | struct acpi_device *adev = to_acpi_device(dev); | |
485 | ||
486 | return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state)); | |
487 | } | |
488 | ||
489 | static DEVICE_ATTR(power_state, 0444, power_state_show, NULL); | |
490 | ||
1da177e4 | 491 | static ssize_t |
f883d9db PM |
492 | acpi_eject_store(struct device *d, struct device_attribute *attr, |
493 | const char *buf, size_t count) | |
1da177e4 | 494 | { |
f883d9db | 495 | struct acpi_device *acpi_device = to_acpi_device(d); |
a33ec399 RW |
496 | acpi_object_type not_used; |
497 | acpi_status status; | |
1da177e4 | 498 | |
a33ec399 | 499 | if (!count || buf[0] != '1') |
1da177e4 | 500 | return -EINVAL; |
1da177e4 | 501 | |
a33ec399 RW |
502 | if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled) |
503 | && !acpi_device->driver) | |
504 | return -ENODEV; | |
505 | ||
506 | status = acpi_get_type(acpi_device->handle, ¬_used); | |
507 | if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable) | |
508 | return -ENODEV; | |
509 | ||
f943db40 | 510 | acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, |
a33ec399 | 511 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); |
a33ec399 | 512 | get_device(&acpi_device->dev); |
c27b2c33 | 513 | status = acpi_hotplug_execute(acpi_device_hotplug, acpi_device, |
7b98118a | 514 | ACPI_OST_EC_OSPM_EJECT); |
f943db40 RW |
515 | if (ACPI_SUCCESS(status)) |
516 | return count; | |
a33ec399 | 517 | |
f943db40 | 518 | put_device(&acpi_device->dev); |
f943db40 | 519 | acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, |
a33ec399 | 520 | ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); |
5add99cf | 521 | return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN; |
1da177e4 LT |
522 | } |
523 | ||
f883d9db | 524 | static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); |
1da177e4 | 525 | |
e49bd2dd ZR |
526 | static ssize_t |
527 | acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
528 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
1da177e4 | 529 | |
ea8d82fd | 530 | return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev)); |
1da177e4 | 531 | } |
e49bd2dd | 532 | static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); |
1da177e4 | 533 | |
923d4a45 LZ |
534 | static ssize_t acpi_device_uid_show(struct device *dev, |
535 | struct device_attribute *attr, char *buf) | |
536 | { | |
537 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
538 | ||
539 | return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id); | |
540 | } | |
541 | static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL); | |
542 | ||
543 | static ssize_t acpi_device_adr_show(struct device *dev, | |
544 | struct device_attribute *attr, char *buf) | |
545 | { | |
546 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
547 | ||
548 | return sprintf(buf, "0x%08x\n", | |
549 | (unsigned int)(acpi_dev->pnp.bus_address)); | |
550 | } | |
551 | static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL); | |
552 | ||
e49bd2dd ZR |
553 | static ssize_t |
554 | acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
555 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
556 | struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; | |
557 | int result; | |
1da177e4 | 558 | |
e49bd2dd | 559 | result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); |
0c526d96 | 560 | if (result) |
e49bd2dd | 561 | goto end; |
1da177e4 | 562 | |
e49bd2dd ZR |
563 | result = sprintf(buf, "%s\n", (char*)path.pointer); |
564 | kfree(path.pointer); | |
0c526d96 | 565 | end: |
e49bd2dd | 566 | return result; |
1da177e4 | 567 | } |
e49bd2dd | 568 | static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); |
1da177e4 | 569 | |
d1efe3c3 LO |
570 | /* sysfs file that shows description text from the ACPI _STR method */ |
571 | static ssize_t description_show(struct device *dev, | |
572 | struct device_attribute *attr, | |
573 | char *buf) { | |
574 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
575 | int result; | |
576 | ||
577 | if (acpi_dev->pnp.str_obj == NULL) | |
578 | return 0; | |
579 | ||
580 | /* | |
581 | * The _STR object contains a Unicode identifier for a device. | |
582 | * We need to convert to utf-8 so it can be displayed. | |
583 | */ | |
584 | result = utf16s_to_utf8s( | |
585 | (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer, | |
586 | acpi_dev->pnp.str_obj->buffer.length, | |
587 | UTF16_LITTLE_ENDIAN, buf, | |
588 | PAGE_SIZE); | |
589 | ||
590 | buf[result++] = '\n'; | |
591 | ||
592 | return result; | |
593 | } | |
594 | static DEVICE_ATTR(description, 0444, description_show, NULL); | |
595 | ||
bb74ac23 YI |
596 | static ssize_t |
597 | acpi_device_sun_show(struct device *dev, struct device_attribute *attr, | |
598 | char *buf) { | |
599 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
600 | ||
601 | return sprintf(buf, "%lu\n", acpi_dev->pnp.sun); | |
602 | } | |
603 | static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL); | |
604 | ||
c713cd7f SP |
605 | static ssize_t status_show(struct device *dev, struct device_attribute *attr, |
606 | char *buf) { | |
607 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
608 | acpi_status status; | |
609 | unsigned long long sta; | |
610 | ||
611 | status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta); | |
612 | if (ACPI_FAILURE(status)) | |
613 | return -ENODEV; | |
614 | ||
615 | return sprintf(buf, "%llu\n", sta); | |
616 | } | |
617 | static DEVICE_ATTR_RO(status); | |
618 | ||
e49bd2dd | 619 | static int acpi_device_setup_files(struct acpi_device *dev) |
1da177e4 | 620 | { |
d1efe3c3 | 621 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
f883d9db | 622 | acpi_status status; |
bb74ac23 | 623 | unsigned long long sun; |
e49bd2dd | 624 | int result = 0; |
1da177e4 LT |
625 | |
626 | /* | |
e49bd2dd | 627 | * Devices gotten from FADT don't have a "path" attribute |
1da177e4 | 628 | */ |
0c526d96 | 629 | if (dev->handle) { |
e49bd2dd | 630 | result = device_create_file(&dev->dev, &dev_attr_path); |
0c526d96 | 631 | if (result) |
e49bd2dd | 632 | goto end; |
1da177e4 LT |
633 | } |
634 | ||
2b2ae7c7 TR |
635 | if (!list_empty(&dev->pnp.ids)) { |
636 | result = device_create_file(&dev->dev, &dev_attr_hid); | |
637 | if (result) | |
638 | goto end; | |
1da177e4 | 639 | |
2b2ae7c7 TR |
640 | result = device_create_file(&dev->dev, &dev_attr_modalias); |
641 | if (result) | |
642 | goto end; | |
643 | } | |
29b71a1c | 644 | |
d1efe3c3 LO |
645 | /* |
646 | * If device has _STR, 'description' file is created | |
647 | */ | |
952c63e9 | 648 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
649 | status = acpi_evaluate_object(dev->handle, "_STR", |
650 | NULL, &buffer); | |
651 | if (ACPI_FAILURE(status)) | |
652 | buffer.pointer = NULL; | |
653 | dev->pnp.str_obj = buffer.pointer; | |
654 | result = device_create_file(&dev->dev, &dev_attr_description); | |
655 | if (result) | |
656 | goto end; | |
657 | } | |
658 | ||
d4e1a692 | 659 | if (dev->pnp.type.bus_address) |
923d4a45 LZ |
660 | result = device_create_file(&dev->dev, &dev_attr_adr); |
661 | if (dev->pnp.unique_id) | |
662 | result = device_create_file(&dev->dev, &dev_attr_uid); | |
663 | ||
bb74ac23 YI |
664 | status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun); |
665 | if (ACPI_SUCCESS(status)) { | |
666 | dev->pnp.sun = (unsigned long)sun; | |
667 | result = device_create_file(&dev->dev, &dev_attr_sun); | |
668 | if (result) | |
669 | goto end; | |
670 | } else { | |
671 | dev->pnp.sun = (unsigned long)-1; | |
672 | } | |
673 | ||
c713cd7f SP |
674 | if (acpi_has_method(dev->handle, "_STA")) { |
675 | result = device_create_file(&dev->dev, &dev_attr_status); | |
676 | if (result) | |
677 | goto end; | |
678 | } | |
679 | ||
e49bd2dd ZR |
680 | /* |
681 | * If device has _EJ0, 'eject' file is created that is used to trigger | |
682 | * hot-removal function from userland. | |
683 | */ | |
952c63e9 | 684 | if (acpi_has_method(dev->handle, "_EJ0")) { |
e49bd2dd | 685 | result = device_create_file(&dev->dev, &dev_attr_eject); |
836aedb1 RW |
686 | if (result) |
687 | return result; | |
688 | } | |
689 | ||
690 | if (dev->flags.power_manageable) { | |
691 | result = device_create_file(&dev->dev, &dev_attr_power_state); | |
692 | if (result) | |
693 | return result; | |
694 | ||
695 | if (dev->power.flags.power_resources) | |
696 | result = device_create_file(&dev->dev, | |
697 | &dev_attr_real_power_state); | |
698 | } | |
699 | ||
0c526d96 | 700 | end: |
e49bd2dd | 701 | return result; |
1da177e4 LT |
702 | } |
703 | ||
f883d9db | 704 | static void acpi_device_remove_files(struct acpi_device *dev) |
1da177e4 | 705 | { |
836aedb1 RW |
706 | if (dev->flags.power_manageable) { |
707 | device_remove_file(&dev->dev, &dev_attr_power_state); | |
708 | if (dev->power.flags.power_resources) | |
709 | device_remove_file(&dev->dev, | |
710 | &dev_attr_real_power_state); | |
711 | } | |
712 | ||
f883d9db | 713 | /* |
d1efe3c3 LO |
714 | * If device has _STR, remove 'description' file |
715 | */ | |
952c63e9 | 716 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
717 | kfree(dev->pnp.str_obj); |
718 | device_remove_file(&dev->dev, &dev_attr_description); | |
719 | } | |
720 | /* | |
721 | * If device has _EJ0, remove 'eject' file. | |
f883d9db | 722 | */ |
952c63e9 | 723 | if (acpi_has_method(dev->handle, "_EJ0")) |
f883d9db | 724 | device_remove_file(&dev->dev, &dev_attr_eject); |
1da177e4 | 725 | |
952c63e9 | 726 | if (acpi_has_method(dev->handle, "_SUN")) |
bb74ac23 YI |
727 | device_remove_file(&dev->dev, &dev_attr_sun); |
728 | ||
923d4a45 LZ |
729 | if (dev->pnp.unique_id) |
730 | device_remove_file(&dev->dev, &dev_attr_uid); | |
d4e1a692 | 731 | if (dev->pnp.type.bus_address) |
923d4a45 | 732 | device_remove_file(&dev->dev, &dev_attr_adr); |
1131b938 BH |
733 | device_remove_file(&dev->dev, &dev_attr_modalias); |
734 | device_remove_file(&dev->dev, &dev_attr_hid); | |
c713cd7f SP |
735 | if (acpi_has_method(dev->handle, "_STA")) |
736 | device_remove_file(&dev->dev, &dev_attr_status); | |
0c526d96 | 737 | if (dev->handle) |
e49bd2dd | 738 | device_remove_file(&dev->dev, &dev_attr_path); |
1da177e4 | 739 | } |
1da177e4 | 740 | /* -------------------------------------------------------------------------- |
9e89dde2 | 741 | ACPI Bus operations |
1da177e4 | 742 | -------------------------------------------------------------------------- */ |
29b71a1c | 743 | |
cf761af9 MW |
744 | static const struct acpi_device_id *__acpi_match_device( |
745 | struct acpi_device *device, const struct acpi_device_id *ids) | |
29b71a1c TR |
746 | { |
747 | const struct acpi_device_id *id; | |
7f47fa6c | 748 | struct acpi_hardware_id *hwid; |
29b71a1c | 749 | |
39a0ad87 ZY |
750 | /* |
751 | * If the device is not present, it is unnecessary to load device | |
752 | * driver for it. | |
753 | */ | |
754 | if (!device->status.present) | |
cf761af9 | 755 | return NULL; |
39a0ad87 | 756 | |
7f47fa6c BH |
757 | for (id = ids; id->id[0]; id++) |
758 | list_for_each_entry(hwid, &device->pnp.ids, list) | |
759 | if (!strcmp((char *) id->id, hwid->id)) | |
cf761af9 MW |
760 | return id; |
761 | ||
762 | return NULL; | |
763 | } | |
764 | ||
765 | /** | |
766 | * acpi_match_device - Match a struct device against a given list of ACPI IDs | |
767 | * @ids: Array of struct acpi_device_id object to match against. | |
768 | * @dev: The device structure to match. | |
769 | * | |
770 | * Check if @dev has a valid ACPI handle and if there is a struct acpi_device | |
771 | * object for that handle and use that object to match against a given list of | |
772 | * device IDs. | |
773 | * | |
774 | * Return a pointer to the first matching ID on success or %NULL on failure. | |
775 | */ | |
776 | const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, | |
777 | const struct device *dev) | |
778 | { | |
779 | struct acpi_device *adev; | |
0613e1f7 | 780 | acpi_handle handle = ACPI_HANDLE(dev); |
cf761af9 | 781 | |
0613e1f7 | 782 | if (!ids || !handle || acpi_bus_get_device(handle, &adev)) |
cf761af9 MW |
783 | return NULL; |
784 | ||
785 | return __acpi_match_device(adev, ids); | |
786 | } | |
787 | EXPORT_SYMBOL_GPL(acpi_match_device); | |
29b71a1c | 788 | |
cf761af9 MW |
789 | int acpi_match_device_ids(struct acpi_device *device, |
790 | const struct acpi_device_id *ids) | |
791 | { | |
792 | return __acpi_match_device(device, ids) ? 0 : -ENOENT; | |
29b71a1c TR |
793 | } |
794 | EXPORT_SYMBOL(acpi_match_device_ids); | |
795 | ||
0b224527 RW |
796 | static void acpi_free_power_resources_lists(struct acpi_device *device) |
797 | { | |
798 | int i; | |
799 | ||
993cbe59 RW |
800 | if (device->wakeup.flags.valid) |
801 | acpi_power_resources_list_free(&device->wakeup.resources); | |
802 | ||
0b224527 RW |
803 | if (!device->flags.power_manageable) |
804 | return; | |
805 | ||
806 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { | |
807 | struct acpi_device_power_state *ps = &device->power.states[i]; | |
808 | acpi_power_resources_list_free(&ps->resources); | |
809 | } | |
7f47fa6c BH |
810 | } |
811 | ||
1890a97a | 812 | static void acpi_device_release(struct device *dev) |
1da177e4 | 813 | { |
1890a97a | 814 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1da177e4 | 815 | |
c0af4175 | 816 | acpi_free_pnp_ids(&acpi_dev->pnp); |
0b224527 | 817 | acpi_free_power_resources_lists(acpi_dev); |
1890a97a | 818 | kfree(acpi_dev); |
1da177e4 LT |
819 | } |
820 | ||
5d9464a4 | 821 | static int acpi_bus_match(struct device *dev, struct device_driver *drv) |
9e89dde2 | 822 | { |
5d9464a4 PM |
823 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
824 | struct acpi_driver *acpi_drv = to_acpi_driver(drv); | |
1da177e4 | 825 | |
209d3b17 | 826 | return acpi_dev->flags.match_driver |
805d410f | 827 | && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); |
5d9464a4 | 828 | } |
1da177e4 | 829 | |
7eff2e7a | 830 | static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 | 831 | { |
5d9464a4 | 832 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
7eff2e7a | 833 | int len; |
5d9464a4 | 834 | |
2b2ae7c7 TR |
835 | if (list_empty(&acpi_dev->pnp.ids)) |
836 | return 0; | |
837 | ||
7eff2e7a KS |
838 | if (add_uevent_var(env, "MODALIAS=")) |
839 | return -ENOMEM; | |
840 | len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], | |
841 | sizeof(env->buf) - env->buflen); | |
842 | if (len >= (sizeof(env->buf) - env->buflen)) | |
843 | return -ENOMEM; | |
844 | env->buflen += len; | |
9e89dde2 | 845 | return 0; |
1da177e4 LT |
846 | } |
847 | ||
46ec8598 BH |
848 | static void acpi_device_notify(acpi_handle handle, u32 event, void *data) |
849 | { | |
850 | struct acpi_device *device = data; | |
851 | ||
852 | device->driver->ops.notify(device, event); | |
853 | } | |
854 | ||
855 | static acpi_status acpi_device_notify_fixed(void *data) | |
856 | { | |
857 | struct acpi_device *device = data; | |
858 | ||
53de5356 BH |
859 | /* Fixed hardware devices have no handles */ |
860 | acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); | |
46ec8598 BH |
861 | return AE_OK; |
862 | } | |
863 | ||
864 | static int acpi_device_install_notify_handler(struct acpi_device *device) | |
865 | { | |
866 | acpi_status status; | |
46ec8598 | 867 | |
ccba2a36 | 868 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 BH |
869 | status = |
870 | acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, | |
871 | acpi_device_notify_fixed, | |
872 | device); | |
ccba2a36 | 873 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 BH |
874 | status = |
875 | acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, | |
876 | acpi_device_notify_fixed, | |
877 | device); | |
878 | else | |
879 | status = acpi_install_notify_handler(device->handle, | |
880 | ACPI_DEVICE_NOTIFY, | |
881 | acpi_device_notify, | |
882 | device); | |
883 | ||
884 | if (ACPI_FAILURE(status)) | |
885 | return -EINVAL; | |
886 | return 0; | |
887 | } | |
888 | ||
889 | static void acpi_device_remove_notify_handler(struct acpi_device *device) | |
890 | { | |
ccba2a36 | 891 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 BH |
892 | acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
893 | acpi_device_notify_fixed); | |
ccba2a36 | 894 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 BH |
895 | acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, |
896 | acpi_device_notify_fixed); | |
897 | else | |
898 | acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, | |
899 | acpi_device_notify); | |
900 | } | |
901 | ||
d9e455f5 | 902 | static int acpi_device_probe(struct device *dev) |
1da177e4 | 903 | { |
5d9464a4 PM |
904 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
905 | struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); | |
906 | int ret; | |
907 | ||
24071f47 RW |
908 | if (acpi_dev->handler) |
909 | return -EINVAL; | |
910 | ||
d9e455f5 RW |
911 | if (!acpi_drv->ops.add) |
912 | return -ENOSYS; | |
46ec8598 | 913 | |
d9e455f5 RW |
914 | ret = acpi_drv->ops.add(acpi_dev); |
915 | if (ret) | |
916 | return ret; | |
46ec8598 | 917 | |
d9e455f5 RW |
918 | acpi_dev->driver = acpi_drv; |
919 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
920 | "Driver [%s] successfully bound to device [%s]\n", | |
921 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
922 | ||
923 | if (acpi_drv->ops.notify) { | |
924 | ret = acpi_device_install_notify_handler(acpi_dev); | |
925 | if (ret) { | |
926 | if (acpi_drv->ops.remove) | |
927 | acpi_drv->ops.remove(acpi_dev); | |
928 | ||
929 | acpi_dev->driver = NULL; | |
930 | acpi_dev->driver_data = NULL; | |
931 | return ret; | |
932 | } | |
5d9464a4 | 933 | } |
d9e455f5 RW |
934 | |
935 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", | |
936 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
937 | get_device(dev); | |
938 | return 0; | |
5d9464a4 | 939 | } |
1da177e4 | 940 | |
5d9464a4 PM |
941 | static int acpi_device_remove(struct device * dev) |
942 | { | |
943 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
944 | struct acpi_driver *acpi_drv = acpi_dev->driver; | |
945 | ||
946 | if (acpi_drv) { | |
46ec8598 BH |
947 | if (acpi_drv->ops.notify) |
948 | acpi_device_remove_notify_handler(acpi_dev); | |
5d9464a4 | 949 | if (acpi_drv->ops.remove) |
51fac838 | 950 | acpi_drv->ops.remove(acpi_dev); |
1da177e4 | 951 | } |
5d9464a4 | 952 | acpi_dev->driver = NULL; |
db89b4f0 | 953 | acpi_dev->driver_data = NULL; |
1da177e4 | 954 | |
5d9464a4 | 955 | put_device(dev); |
9e89dde2 ZR |
956 | return 0; |
957 | } | |
1da177e4 | 958 | |
55955aad | 959 | struct bus_type acpi_bus_type = { |
9e89dde2 | 960 | .name = "acpi", |
5d9464a4 PM |
961 | .match = acpi_bus_match, |
962 | .probe = acpi_device_probe, | |
963 | .remove = acpi_device_remove, | |
964 | .uevent = acpi_device_uevent, | |
9e89dde2 ZR |
965 | }; |
966 | ||
d783156e RW |
967 | static void acpi_device_del(struct acpi_device *device) |
968 | { | |
969 | mutex_lock(&acpi_device_lock); | |
970 | if (device->parent) | |
971 | list_del(&device->node); | |
972 | ||
973 | list_del(&device->wakeup_list); | |
974 | mutex_unlock(&acpi_device_lock); | |
975 | ||
976 | acpi_power_add_remove_device(device, false); | |
977 | acpi_device_remove_files(device); | |
978 | if (device->remove) | |
979 | device->remove(device); | |
980 | ||
981 | device_del(&device->dev); | |
982 | } | |
983 | ||
984 | static LIST_HEAD(acpi_device_del_list); | |
985 | static DEFINE_MUTEX(acpi_device_del_lock); | |
986 | ||
987 | static void acpi_device_del_work_fn(struct work_struct *work_not_used) | |
988 | { | |
989 | for (;;) { | |
990 | struct acpi_device *adev; | |
991 | ||
992 | mutex_lock(&acpi_device_del_lock); | |
993 | ||
994 | if (list_empty(&acpi_device_del_list)) { | |
995 | mutex_unlock(&acpi_device_del_lock); | |
996 | break; | |
997 | } | |
998 | adev = list_first_entry(&acpi_device_del_list, | |
999 | struct acpi_device, del_list); | |
1000 | list_del(&adev->del_list); | |
1001 | ||
1002 | mutex_unlock(&acpi_device_del_lock); | |
1003 | ||
1004 | acpi_device_del(adev); | |
1005 | /* | |
1006 | * Drop references to all power resources that might have been | |
1007 | * used by the device. | |
1008 | */ | |
1009 | acpi_power_transition(adev, ACPI_STATE_D3_COLD); | |
1010 | put_device(&adev->dev); | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | /** | |
1015 | * acpi_scan_drop_device - Drop an ACPI device object. | |
1016 | * @handle: Handle of an ACPI namespace node, not used. | |
1017 | * @context: Address of the ACPI device object to drop. | |
1018 | * | |
1019 | * This is invoked by acpi_ns_delete_node() during the removal of the ACPI | |
1020 | * namespace node the device object pointed to by @context is attached to. | |
1021 | * | |
1022 | * The unregistration is carried out asynchronously to avoid running | |
1023 | * acpi_device_del() under the ACPICA's namespace mutex and the list is used to | |
1024 | * ensure the correct ordering (the device objects must be unregistered in the | |
1025 | * same order in which the corresponding namespace nodes are deleted). | |
1026 | */ | |
1027 | static void acpi_scan_drop_device(acpi_handle handle, void *context) | |
caf5c03f | 1028 | { |
d783156e RW |
1029 | static DECLARE_WORK(work, acpi_device_del_work_fn); |
1030 | struct acpi_device *adev = context; | |
1031 | ||
1032 | mutex_lock(&acpi_device_del_lock); | |
1033 | ||
1034 | /* | |
1035 | * Use the ACPI hotplug workqueue which is ordered, so this work item | |
1036 | * won't run after any hotplug work items submitted subsequently. That | |
1037 | * prevents attempts to register device objects identical to those being | |
1038 | * deleted from happening concurrently (such attempts result from | |
1039 | * hotplug events handled via the ACPI hotplug workqueue). It also will | |
1040 | * run after all of the work items submitted previosuly, which helps | |
1041 | * those work items to ensure that they are not accessing stale device | |
1042 | * objects. | |
1043 | */ | |
1044 | if (list_empty(&acpi_device_del_list)) | |
1045 | acpi_queue_hotplug_work(&work); | |
1046 | ||
1047 | list_add_tail(&adev->del_list, &acpi_device_del_list); | |
1048 | /* Make acpi_ns_validate_handle() return NULL for this handle. */ | |
1049 | adev->handle = INVALID_ACPI_HANDLE; | |
1050 | ||
1051 | mutex_unlock(&acpi_device_del_lock); | |
caf5c03f RW |
1052 | } |
1053 | ||
1054 | int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) | |
1055 | { | |
1056 | acpi_status status; | |
1057 | ||
1058 | if (!device) | |
1059 | return -EINVAL; | |
1060 | ||
d783156e | 1061 | status = acpi_get_data(handle, acpi_scan_drop_device, (void **)device); |
caf5c03f RW |
1062 | if (ACPI_FAILURE(status) || !*device) { |
1063 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", | |
1064 | handle)); | |
1065 | return -ENODEV; | |
1066 | } | |
1067 | return 0; | |
1068 | } | |
6585925b | 1069 | EXPORT_SYMBOL(acpi_bus_get_device); |
caf5c03f | 1070 | |
cf860be6 RW |
1071 | int acpi_device_add(struct acpi_device *device, |
1072 | void (*release)(struct device *)) | |
1da177e4 | 1073 | { |
4be44fcd | 1074 | int result; |
e49bd2dd ZR |
1075 | struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; |
1076 | int found = 0; | |
66b7ed40 | 1077 | |
d43e167d RW |
1078 | if (device->handle) { |
1079 | acpi_status status; | |
1080 | ||
d783156e | 1081 | status = acpi_attach_data(device->handle, acpi_scan_drop_device, |
d43e167d RW |
1082 | device); |
1083 | if (ACPI_FAILURE(status)) { | |
1084 | acpi_handle_err(device->handle, | |
1085 | "Unable to attach device data\n"); | |
1086 | return -ENODEV; | |
1087 | } | |
1088 | } | |
1089 | ||
9e89dde2 ZR |
1090 | /* |
1091 | * Linkage | |
1092 | * ------- | |
1093 | * Link this device to its parent and siblings. | |
1094 | */ | |
1095 | INIT_LIST_HEAD(&device->children); | |
1096 | INIT_LIST_HEAD(&device->node); | |
9e89dde2 | 1097 | INIT_LIST_HEAD(&device->wakeup_list); |
1033f904 | 1098 | INIT_LIST_HEAD(&device->physical_node_list); |
d783156e | 1099 | INIT_LIST_HEAD(&device->del_list); |
1033f904 | 1100 | mutex_init(&device->physical_node_lock); |
1da177e4 | 1101 | |
e49bd2dd ZR |
1102 | new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); |
1103 | if (!new_bus_id) { | |
d43e167d RW |
1104 | pr_err(PREFIX "Memory allocation error\n"); |
1105 | result = -ENOMEM; | |
1106 | goto err_detach; | |
1da177e4 | 1107 | } |
e49bd2dd | 1108 | |
9090589d | 1109 | mutex_lock(&acpi_device_lock); |
e49bd2dd ZR |
1110 | /* |
1111 | * Find suitable bus_id and instance number in acpi_bus_id_list | |
1112 | * If failed, create one and link it into acpi_bus_id_list | |
1113 | */ | |
1114 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { | |
1131b938 BH |
1115 | if (!strcmp(acpi_device_bus_id->bus_id, |
1116 | acpi_device_hid(device))) { | |
1117 | acpi_device_bus_id->instance_no++; | |
e49bd2dd ZR |
1118 | found = 1; |
1119 | kfree(new_bus_id); | |
1120 | break; | |
1121 | } | |
1da177e4 | 1122 | } |
0c526d96 | 1123 | if (!found) { |
e49bd2dd | 1124 | acpi_device_bus_id = new_bus_id; |
1131b938 | 1125 | strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); |
e49bd2dd ZR |
1126 | acpi_device_bus_id->instance_no = 0; |
1127 | list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); | |
1da177e4 | 1128 | } |
0794469d | 1129 | dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); |
1da177e4 | 1130 | |
33b57150 | 1131 | if (device->parent) |
9e89dde2 | 1132 | list_add_tail(&device->node, &device->parent->children); |
33b57150 | 1133 | |
9e89dde2 ZR |
1134 | if (device->wakeup.flags.valid) |
1135 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); | |
9090589d | 1136 | mutex_unlock(&acpi_device_lock); |
1da177e4 | 1137 | |
1890a97a | 1138 | if (device->parent) |
66b7ed40 | 1139 | device->dev.parent = &device->parent->dev; |
1890a97a | 1140 | device->dev.bus = &acpi_bus_type; |
82c7d5ef | 1141 | device->dev.release = release; |
cf860be6 | 1142 | result = device_add(&device->dev); |
0c526d96 | 1143 | if (result) { |
8b12b922 | 1144 | dev_err(&device->dev, "Error registering device\n"); |
d43e167d | 1145 | goto err; |
1da177e4 | 1146 | } |
1da177e4 | 1147 | |
e49bd2dd | 1148 | result = acpi_device_setup_files(device); |
0c526d96 | 1149 | if (result) |
0794469d KS |
1150 | printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", |
1151 | dev_name(&device->dev)); | |
1da177e4 | 1152 | |
1da177e4 | 1153 | return 0; |
d43e167d RW |
1154 | |
1155 | err: | |
9090589d | 1156 | mutex_lock(&acpi_device_lock); |
33b57150 | 1157 | if (device->parent) |
e49bd2dd | 1158 | list_del(&device->node); |
e49bd2dd | 1159 | list_del(&device->wakeup_list); |
9090589d | 1160 | mutex_unlock(&acpi_device_lock); |
d43e167d RW |
1161 | |
1162 | err_detach: | |
d783156e | 1163 | acpi_detach_data(device->handle, acpi_scan_drop_device); |
e49bd2dd | 1164 | return result; |
1da177e4 LT |
1165 | } |
1166 | ||
9e89dde2 ZR |
1167 | /* -------------------------------------------------------------------------- |
1168 | Driver Management | |
1169 | -------------------------------------------------------------------------- */ | |
9e89dde2 ZR |
1170 | /** |
1171 | * acpi_bus_register_driver - register a driver with the ACPI bus | |
1172 | * @driver: driver being registered | |
1173 | * | |
1174 | * Registers a driver with the ACPI bus. Searches the namespace for all | |
1175 | * devices that match the driver's criteria and binds. Returns zero for | |
1176 | * success or a negative error status for failure. | |
1177 | */ | |
1178 | int acpi_bus_register_driver(struct acpi_driver *driver) | |
1da177e4 | 1179 | { |
1890a97a | 1180 | int ret; |
1da177e4 | 1181 | |
9e89dde2 ZR |
1182 | if (acpi_disabled) |
1183 | return -ENODEV; | |
1890a97a PM |
1184 | driver->drv.name = driver->name; |
1185 | driver->drv.bus = &acpi_bus_type; | |
1186 | driver->drv.owner = driver->owner; | |
1da177e4 | 1187 | |
1890a97a PM |
1188 | ret = driver_register(&driver->drv); |
1189 | return ret; | |
9e89dde2 | 1190 | } |
1da177e4 | 1191 | |
9e89dde2 ZR |
1192 | EXPORT_SYMBOL(acpi_bus_register_driver); |
1193 | ||
1194 | /** | |
b27b14ce | 1195 | * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus |
9e89dde2 ZR |
1196 | * @driver: driver to unregister |
1197 | * | |
1198 | * Unregisters a driver with the ACPI bus. Searches the namespace for all | |
1199 | * devices that match the driver's criteria and unbinds. | |
1200 | */ | |
1201 | void acpi_bus_unregister_driver(struct acpi_driver *driver) | |
1202 | { | |
1890a97a | 1203 | driver_unregister(&driver->drv); |
9e89dde2 ZR |
1204 | } |
1205 | ||
1206 | EXPORT_SYMBOL(acpi_bus_unregister_driver); | |
1207 | ||
9e89dde2 ZR |
1208 | /* -------------------------------------------------------------------------- |
1209 | Device Enumeration | |
1210 | -------------------------------------------------------------------------- */ | |
5c478f49 BH |
1211 | static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) |
1212 | { | |
456de893 | 1213 | struct acpi_device *device = NULL; |
5c478f49 | 1214 | acpi_status status; |
5c478f49 BH |
1215 | |
1216 | /* | |
1217 | * Fixed hardware devices do not appear in the namespace and do not | |
1218 | * have handles, but we fabricate acpi_devices for them, so we have | |
1219 | * to deal with them specially. | |
1220 | */ | |
456de893 | 1221 | if (!handle) |
5c478f49 BH |
1222 | return acpi_root; |
1223 | ||
1224 | do { | |
1225 | status = acpi_get_parent(handle, &handle); | |
5c478f49 | 1226 | if (ACPI_FAILURE(status)) |
456de893 RW |
1227 | return status == AE_NULL_ENTRY ? NULL : acpi_root; |
1228 | } while (acpi_bus_get_device(handle, &device)); | |
1229 | return device; | |
5c478f49 BH |
1230 | } |
1231 | ||
9e89dde2 ZR |
1232 | acpi_status |
1233 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) | |
1234 | { | |
1235 | acpi_status status; | |
1236 | acpi_handle tmp; | |
1237 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
1238 | union acpi_object *obj; | |
1239 | ||
1240 | status = acpi_get_handle(handle, "_EJD", &tmp); | |
1241 | if (ACPI_FAILURE(status)) | |
1242 | return status; | |
1243 | ||
1244 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); | |
1245 | if (ACPI_SUCCESS(status)) { | |
1246 | obj = buffer.pointer; | |
3b5fee59 HM |
1247 | status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, |
1248 | ejd); | |
9e89dde2 ZR |
1249 | kfree(buffer.pointer); |
1250 | } | |
1251 | return status; | |
1252 | } | |
1253 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); | |
1254 | ||
e88c9c60 RW |
1255 | static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle, |
1256 | struct acpi_device_wakeup *wakeup) | |
9e89dde2 | 1257 | { |
b581a7f9 RW |
1258 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1259 | union acpi_object *package = NULL; | |
9e89dde2 | 1260 | union acpi_object *element = NULL; |
b581a7f9 | 1261 | acpi_status status; |
e88c9c60 | 1262 | int err = -ENODATA; |
9e89dde2 | 1263 | |
b581a7f9 | 1264 | if (!wakeup) |
e88c9c60 | 1265 | return -EINVAL; |
9e89dde2 | 1266 | |
993cbe59 | 1267 | INIT_LIST_HEAD(&wakeup->resources); |
9e89dde2 | 1268 | |
b581a7f9 RW |
1269 | /* _PRW */ |
1270 | status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); | |
1271 | if (ACPI_FAILURE(status)) { | |
1272 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); | |
e88c9c60 | 1273 | return err; |
b581a7f9 RW |
1274 | } |
1275 | ||
1276 | package = (union acpi_object *)buffer.pointer; | |
1277 | ||
e88c9c60 | 1278 | if (!package || package->package.count < 2) |
b581a7f9 | 1279 | goto out; |
b581a7f9 | 1280 | |
9e89dde2 | 1281 | element = &(package->package.elements[0]); |
e88c9c60 | 1282 | if (!element) |
b581a7f9 | 1283 | goto out; |
e88c9c60 | 1284 | |
9e89dde2 ZR |
1285 | if (element->type == ACPI_TYPE_PACKAGE) { |
1286 | if ((element->package.count < 2) || | |
1287 | (element->package.elements[0].type != | |
1288 | ACPI_TYPE_LOCAL_REFERENCE) | |
e88c9c60 | 1289 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
b581a7f9 | 1290 | goto out; |
e88c9c60 | 1291 | |
b581a7f9 | 1292 | wakeup->gpe_device = |
9e89dde2 | 1293 | element->package.elements[0].reference.handle; |
b581a7f9 | 1294 | wakeup->gpe_number = |
9e89dde2 ZR |
1295 | (u32) element->package.elements[1].integer.value; |
1296 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
b581a7f9 RW |
1297 | wakeup->gpe_device = NULL; |
1298 | wakeup->gpe_number = element->integer.value; | |
1299 | } else { | |
b581a7f9 RW |
1300 | goto out; |
1301 | } | |
9e89dde2 ZR |
1302 | |
1303 | element = &(package->package.elements[1]); | |
e88c9c60 | 1304 | if (element->type != ACPI_TYPE_INTEGER) |
b581a7f9 | 1305 | goto out; |
e88c9c60 | 1306 | |
b581a7f9 | 1307 | wakeup->sleep_state = element->integer.value; |
9e89dde2 | 1308 | |
e88c9c60 RW |
1309 | err = acpi_extract_power_resources(package, 2, &wakeup->resources); |
1310 | if (err) | |
b581a7f9 | 1311 | goto out; |
9e89dde2 | 1312 | |
0596a52b RW |
1313 | if (!list_empty(&wakeup->resources)) { |
1314 | int sleep_state; | |
9e89dde2 | 1315 | |
b5d667eb RW |
1316 | err = acpi_power_wakeup_list_init(&wakeup->resources, |
1317 | &sleep_state); | |
1318 | if (err) { | |
1319 | acpi_handle_warn(handle, "Retrieving current states " | |
1320 | "of wakeup power resources failed\n"); | |
1321 | acpi_power_resources_list_free(&wakeup->resources); | |
1322 | goto out; | |
1323 | } | |
0596a52b RW |
1324 | if (sleep_state < wakeup->sleep_state) { |
1325 | acpi_handle_warn(handle, "Overriding _PRW sleep state " | |
1326 | "(S%d) by S%d from power resources\n", | |
1327 | (int)wakeup->sleep_state, sleep_state); | |
1328 | wakeup->sleep_state = sleep_state; | |
1329 | } | |
1330 | } | |
bba63a29 | 1331 | acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number); |
9874647b | 1332 | |
b581a7f9 RW |
1333 | out: |
1334 | kfree(buffer.pointer); | |
e88c9c60 | 1335 | return err; |
1da177e4 LT |
1336 | } |
1337 | ||
f517709d | 1338 | static void acpi_bus_set_run_wake_flags(struct acpi_device *device) |
1da177e4 | 1339 | { |
29b71a1c | 1340 | struct acpi_device_id button_device_ids[] = { |
29b71a1c | 1341 | {"PNP0C0C", 0}, |
b7e38304 | 1342 | {"PNP0C0D", 0}, |
29b71a1c TR |
1343 | {"PNP0C0E", 0}, |
1344 | {"", 0}, | |
1345 | }; | |
f517709d RW |
1346 | acpi_status status; |
1347 | acpi_event_status event_status; | |
1348 | ||
b67ea761 | 1349 | device->wakeup.flags.notifier_present = 0; |
f517709d RW |
1350 | |
1351 | /* Power button, Lid switch always enable wakeup */ | |
1352 | if (!acpi_match_device_ids(device, button_device_ids)) { | |
1353 | device->wakeup.flags.run_wake = 1; | |
b7e38304 ZR |
1354 | if (!acpi_match_device_ids(device, &button_device_ids[1])) { |
1355 | /* Do not use Lid/sleep button for S5 wakeup */ | |
1356 | if (device->wakeup.sleep_state == ACPI_STATE_S5) | |
1357 | device->wakeup.sleep_state = ACPI_STATE_S4; | |
1358 | } | |
f2b56bc8 | 1359 | device_set_wakeup_capable(&device->dev, true); |
f517709d RW |
1360 | return; |
1361 | } | |
1362 | ||
e8e18c95 RW |
1363 | status = acpi_get_gpe_status(device->wakeup.gpe_device, |
1364 | device->wakeup.gpe_number, | |
1365 | &event_status); | |
f517709d RW |
1366 | if (status == AE_OK) |
1367 | device->wakeup.flags.run_wake = | |
1368 | !!(event_status & ACPI_EVENT_FLAG_HANDLE); | |
1369 | } | |
1370 | ||
d57d09a4 | 1371 | static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
f517709d | 1372 | { |
e88c9c60 | 1373 | int err; |
29b71a1c | 1374 | |
d57d09a4 | 1375 | /* Presence of _PRW indicates wake capable */ |
952c63e9 | 1376 | if (!acpi_has_method(device->handle, "_PRW")) |
d57d09a4 RW |
1377 | return; |
1378 | ||
e88c9c60 RW |
1379 | err = acpi_bus_extract_wakeup_device_power_package(device->handle, |
1380 | &device->wakeup); | |
1381 | if (err) { | |
1382 | dev_err(&device->dev, "_PRW evaluation error: %d\n", err); | |
d57d09a4 | 1383 | return; |
9e89dde2 | 1384 | } |
1da177e4 | 1385 | |
9e89dde2 | 1386 | device->wakeup.flags.valid = 1; |
9b83ccd2 | 1387 | device->wakeup.prepare_count = 0; |
f517709d | 1388 | acpi_bus_set_run_wake_flags(device); |
729b2bdb ZY |
1389 | /* Call _PSW/_DSW object to disable its ability to wake the sleeping |
1390 | * system for the ACPI device with the _PRW object. | |
1391 | * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. | |
1392 | * So it is necessary to call _DSW object first. Only when it is not | |
1393 | * present will the _PSW object used. | |
1394 | */ | |
e88c9c60 RW |
1395 | err = acpi_device_sleep_wake(device, 0, 0, 0); |
1396 | if (err) | |
77e76609 RW |
1397 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1398 | "error in _DSW or _PSW evaluation\n")); | |
1da177e4 | 1399 | } |
1da177e4 | 1400 | |
f33ce568 RW |
1401 | static void acpi_bus_init_power_state(struct acpi_device *device, int state) |
1402 | { | |
1403 | struct acpi_device_power_state *ps = &device->power.states[state]; | |
ef85bdbe RW |
1404 | char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; |
1405 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
f33ce568 | 1406 | acpi_status status; |
bf325f95 | 1407 | |
f33ce568 RW |
1408 | INIT_LIST_HEAD(&ps->resources); |
1409 | ||
ef85bdbe RW |
1410 | /* Evaluate "_PRx" to get referenced power resources */ |
1411 | status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); | |
1412 | if (ACPI_SUCCESS(status)) { | |
1413 | union acpi_object *package = buffer.pointer; | |
1414 | ||
1415 | if (buffer.length && package | |
1416 | && package->type == ACPI_TYPE_PACKAGE | |
1417 | && package->package.count) { | |
e88c9c60 RW |
1418 | int err = acpi_extract_power_resources(package, 0, |
1419 | &ps->resources); | |
1420 | if (!err) | |
ef85bdbe | 1421 | device->power.flags.power_resources = 1; |
f33ce568 | 1422 | } |
ef85bdbe | 1423 | ACPI_FREE(buffer.pointer); |
f33ce568 RW |
1424 | } |
1425 | ||
1426 | /* Evaluate "_PSx" to see if we can do explicit sets */ | |
ef85bdbe | 1427 | pathname[2] = 'S'; |
952c63e9 | 1428 | if (acpi_has_method(device->handle, pathname)) |
f33ce568 RW |
1429 | ps->flags.explicit_set = 1; |
1430 | ||
1431 | /* | |
1432 | * State is valid if there are means to put the device into it. | |
1433 | * D3hot is only valid if _PR3 present. | |
1434 | */ | |
ef85bdbe | 1435 | if (!list_empty(&ps->resources) |
f33ce568 RW |
1436 | || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) { |
1437 | ps->flags.valid = 1; | |
1438 | ps->flags.os_accessible = 1; | |
1439 | } | |
1440 | ||
1441 | ps->power = -1; /* Unknown - driver assigned */ | |
1442 | ps->latency = -1; /* Unknown - driver assigned */ | |
1443 | } | |
1444 | ||
d43e167d | 1445 | static void acpi_bus_get_power_flags(struct acpi_device *device) |
1da177e4 | 1446 | { |
8bc5053b | 1447 | u32 i; |
1a365616 | 1448 | |
d43e167d | 1449 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ |
952c63e9 JL |
1450 | if (!acpi_has_method(device->handle, "_PS0") && |
1451 | !acpi_has_method(device->handle, "_PR0")) | |
1452 | return; | |
1a365616 | 1453 | |
d43e167d | 1454 | device->flags.power_manageable = 1; |
4be44fcd | 1455 | |
9e89dde2 ZR |
1456 | /* |
1457 | * Power Management Flags | |
1458 | */ | |
952c63e9 | 1459 | if (acpi_has_method(device->handle, "_PSC")) |
9e89dde2 | 1460 | device->power.flags.explicit_get = 1; |
952c63e9 | 1461 | if (acpi_has_method(device->handle, "_IRC")) |
9e89dde2 | 1462 | device->power.flags.inrush_current = 1; |
1da177e4 | 1463 | |
9e89dde2 ZR |
1464 | /* |
1465 | * Enumerate supported power management states | |
1466 | */ | |
f33ce568 RW |
1467 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) |
1468 | acpi_bus_init_power_state(device, i); | |
bf325f95 | 1469 | |
0b224527 | 1470 | INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); |
1da177e4 | 1471 | |
9e89dde2 ZR |
1472 | /* Set defaults for D0 and D3 states (always valid) */ |
1473 | device->power.states[ACPI_STATE_D0].flags.valid = 1; | |
1474 | device->power.states[ACPI_STATE_D0].power = 100; | |
8ad928d5 RW |
1475 | device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; |
1476 | device->power.states[ACPI_STATE_D3_COLD].power = 0; | |
c8f7a62c | 1477 | |
5c7dd710 RW |
1478 | /* Set D3cold's explicit_set flag if _PS3 exists. */ |
1479 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set) | |
1480 | device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1; | |
1481 | ||
1399dfcd AL |
1482 | /* Presence of _PS3 or _PRx means we can put the device into D3 cold */ |
1483 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set || | |
1484 | device->power.flags.power_resources) | |
1485 | device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1; | |
1486 | ||
b3785492 RW |
1487 | if (acpi_bus_init_power(device)) { |
1488 | acpi_free_power_resources_lists(device); | |
1489 | device->flags.power_manageable = 0; | |
1490 | } | |
9e89dde2 | 1491 | } |
c8f7a62c | 1492 | |
d43e167d | 1493 | static void acpi_bus_get_flags(struct acpi_device *device) |
1da177e4 | 1494 | { |
1da177e4 | 1495 | /* Presence of _STA indicates 'dynamic_status' */ |
952c63e9 | 1496 | if (acpi_has_method(device->handle, "_STA")) |
1da177e4 LT |
1497 | device->flags.dynamic_status = 1; |
1498 | ||
1da177e4 | 1499 | /* Presence of _RMV indicates 'removable' */ |
952c63e9 | 1500 | if (acpi_has_method(device->handle, "_RMV")) |
1da177e4 LT |
1501 | device->flags.removable = 1; |
1502 | ||
1503 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ | |
952c63e9 JL |
1504 | if (acpi_has_method(device->handle, "_EJD") || |
1505 | acpi_has_method(device->handle, "_EJ0")) | |
1da177e4 | 1506 | device->flags.ejectable = 1; |
1da177e4 LT |
1507 | } |
1508 | ||
c7bcb4e9 | 1509 | static void acpi_device_get_busid(struct acpi_device *device) |
1da177e4 | 1510 | { |
4be44fcd LB |
1511 | char bus_id[5] = { '?', 0 }; |
1512 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; | |
1513 | int i = 0; | |
1da177e4 LT |
1514 | |
1515 | /* | |
1516 | * Bus ID | |
1517 | * ------ | |
1518 | * The device's Bus ID is simply the object name. | |
1519 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? | |
1520 | */ | |
859ac9a4 | 1521 | if (ACPI_IS_ROOT_DEVICE(device)) { |
1da177e4 | 1522 | strcpy(device->pnp.bus_id, "ACPI"); |
859ac9a4 BH |
1523 | return; |
1524 | } | |
1525 | ||
1526 | switch (device->device_type) { | |
1da177e4 LT |
1527 | case ACPI_BUS_TYPE_POWER_BUTTON: |
1528 | strcpy(device->pnp.bus_id, "PWRF"); | |
1529 | break; | |
1530 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
1531 | strcpy(device->pnp.bus_id, "SLPF"); | |
1532 | break; | |
1533 | default: | |
66b7ed40 | 1534 | acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); |
1da177e4 LT |
1535 | /* Clean up trailing underscores (if any) */ |
1536 | for (i = 3; i > 1; i--) { | |
1537 | if (bus_id[i] == '_') | |
1538 | bus_id[i] = '\0'; | |
1539 | else | |
1540 | break; | |
1541 | } | |
1542 | strcpy(device->pnp.bus_id, bus_id); | |
1543 | break; | |
1544 | } | |
1545 | } | |
1546 | ||
ebf4df8d JL |
1547 | /* |
1548 | * acpi_ata_match - see if an acpi object is an ATA device | |
1549 | * | |
1550 | * If an acpi object has one of the ACPI ATA methods defined, | |
1551 | * then we can safely call it an ATA device. | |
1552 | */ | |
1553 | bool acpi_ata_match(acpi_handle handle) | |
1554 | { | |
1555 | return acpi_has_method(handle, "_GTF") || | |
1556 | acpi_has_method(handle, "_GTM") || | |
1557 | acpi_has_method(handle, "_STM") || | |
1558 | acpi_has_method(handle, "_SDD"); | |
1559 | } | |
1560 | ||
54735266 | 1561 | /* |
d4e1a692 | 1562 | * acpi_bay_match - see if an acpi object is an ejectable driver bay |
54735266 ZR |
1563 | * |
1564 | * If an acpi object is ejectable and has one of the ACPI ATA methods defined, | |
1565 | * then we can safely call it an ejectable drive bay | |
1566 | */ | |
ebf4df8d | 1567 | bool acpi_bay_match(acpi_handle handle) |
d4e1a692 | 1568 | { |
54735266 ZR |
1569 | acpi_handle phandle; |
1570 | ||
952c63e9 | 1571 | if (!acpi_has_method(handle, "_EJ0")) |
ebf4df8d JL |
1572 | return false; |
1573 | if (acpi_ata_match(handle)) | |
1574 | return true; | |
1575 | if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) | |
1576 | return false; | |
54735266 | 1577 | |
ebf4df8d | 1578 | return acpi_ata_match(phandle); |
54735266 ZR |
1579 | } |
1580 | ||
3620f2f2 | 1581 | /* |
d4e1a692 | 1582 | * acpi_dock_match - see if an acpi object has a _DCK method |
3620f2f2 | 1583 | */ |
ebf4df8d | 1584 | bool acpi_dock_match(acpi_handle handle) |
3620f2f2 | 1585 | { |
ebf4df8d | 1586 | return acpi_has_method(handle, "_DCK"); |
3620f2f2 FS |
1587 | } |
1588 | ||
620e112c | 1589 | const char *acpi_device_hid(struct acpi_device *device) |
15b8dd53 | 1590 | { |
7f47fa6c | 1591 | struct acpi_hardware_id *hid; |
15b8dd53 | 1592 | |
2b2ae7c7 TR |
1593 | if (list_empty(&device->pnp.ids)) |
1594 | return dummy_hid; | |
1595 | ||
7f47fa6c BH |
1596 | hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); |
1597 | return hid->id; | |
1598 | } | |
1599 | EXPORT_SYMBOL(acpi_device_hid); | |
15b8dd53 | 1600 | |
d4e1a692 | 1601 | static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) |
7f47fa6c BH |
1602 | { |
1603 | struct acpi_hardware_id *id; | |
15b8dd53 | 1604 | |
7f47fa6c BH |
1605 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
1606 | if (!id) | |
1607 | return; | |
15b8dd53 | 1608 | |
581de59e | 1609 | id->id = kstrdup(dev_id, GFP_KERNEL); |
7f47fa6c BH |
1610 | if (!id->id) { |
1611 | kfree(id); | |
1612 | return; | |
15b8dd53 BM |
1613 | } |
1614 | ||
d4e1a692 TK |
1615 | list_add_tail(&id->list, &pnp->ids); |
1616 | pnp->type.hardware_id = 1; | |
15b8dd53 BM |
1617 | } |
1618 | ||
222e82ac DW |
1619 | /* |
1620 | * Old IBM workstations have a DSDT bug wherein the SMBus object | |
1621 | * lacks the SMBUS01 HID and the methods do not have the necessary "_" | |
1622 | * prefix. Work around this. | |
1623 | */ | |
ebf4df8d | 1624 | static bool acpi_ibm_smbus_match(acpi_handle handle) |
222e82ac | 1625 | { |
ebf4df8d JL |
1626 | char node_name[ACPI_PATH_SEGMENT_LENGTH]; |
1627 | struct acpi_buffer path = { sizeof(node_name), node_name }; | |
222e82ac DW |
1628 | |
1629 | if (!dmi_name_in_vendors("IBM")) | |
ebf4df8d | 1630 | return false; |
222e82ac DW |
1631 | |
1632 | /* Look for SMBS object */ | |
ebf4df8d JL |
1633 | if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || |
1634 | strcmp("SMBS", path.pointer)) | |
1635 | return false; | |
222e82ac DW |
1636 | |
1637 | /* Does it have the necessary (but misnamed) methods? */ | |
952c63e9 JL |
1638 | if (acpi_has_method(handle, "SBI") && |
1639 | acpi_has_method(handle, "SBR") && | |
1640 | acpi_has_method(handle, "SBW")) | |
ebf4df8d JL |
1641 | return true; |
1642 | ||
1643 | return false; | |
222e82ac DW |
1644 | } |
1645 | ||
c0af4175 TK |
1646 | static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, |
1647 | int device_type) | |
1da177e4 | 1648 | { |
4be44fcd | 1649 | acpi_status status; |
57f3674f | 1650 | struct acpi_device_info *info; |
78e25fef | 1651 | struct acpi_pnp_device_id_list *cid_list; |
7f47fa6c | 1652 | int i; |
1da177e4 | 1653 | |
c0af4175 | 1654 | switch (device_type) { |
1da177e4 | 1655 | case ACPI_BUS_TYPE_DEVICE: |
c0af4175 TK |
1656 | if (handle == ACPI_ROOT_OBJECT) { |
1657 | acpi_add_id(pnp, ACPI_SYSTEM_HID); | |
859ac9a4 BH |
1658 | break; |
1659 | } | |
1660 | ||
c0af4175 | 1661 | status = acpi_get_object_info(handle, &info); |
1da177e4 | 1662 | if (ACPI_FAILURE(status)) { |
c0af4175 TK |
1663 | pr_err(PREFIX "%s: Error reading device info\n", |
1664 | __func__); | |
1da177e4 LT |
1665 | return; |
1666 | } | |
1667 | ||
1da177e4 | 1668 | if (info->valid & ACPI_VALID_HID) |
c0af4175 | 1669 | acpi_add_id(pnp, info->hardware_id.string); |
57f3674f | 1670 | if (info->valid & ACPI_VALID_CID) { |
15b8dd53 | 1671 | cid_list = &info->compatible_id_list; |
57f3674f | 1672 | for (i = 0; i < cid_list->count; i++) |
c0af4175 | 1673 | acpi_add_id(pnp, cid_list->ids[i].string); |
57f3674f | 1674 | } |
1da177e4 | 1675 | if (info->valid & ACPI_VALID_ADR) { |
c0af4175 TK |
1676 | pnp->bus_address = info->address; |
1677 | pnp->type.bus_address = 1; | |
1da177e4 | 1678 | } |
ccf78040 | 1679 | if (info->valid & ACPI_VALID_UID) |
c0af4175 | 1680 | pnp->unique_id = kstrdup(info->unique_id.string, |
ccf78040 | 1681 | GFP_KERNEL); |
ae843332 | 1682 | |
a83893ae BH |
1683 | kfree(info); |
1684 | ||
57f3674f BH |
1685 | /* |
1686 | * Some devices don't reliably have _HIDs & _CIDs, so add | |
1687 | * synthetic HIDs to make sure drivers can find them. | |
1688 | */ | |
c0af4175 TK |
1689 | if (acpi_is_video_device(handle)) |
1690 | acpi_add_id(pnp, ACPI_VIDEO_HID); | |
ebf4df8d | 1691 | else if (acpi_bay_match(handle)) |
c0af4175 | 1692 | acpi_add_id(pnp, ACPI_BAY_HID); |
ebf4df8d | 1693 | else if (acpi_dock_match(handle)) |
c0af4175 | 1694 | acpi_add_id(pnp, ACPI_DOCK_HID); |
ebf4df8d | 1695 | else if (acpi_ibm_smbus_match(handle)) |
c0af4175 TK |
1696 | acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); |
1697 | else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) { | |
1698 | acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */ | |
1699 | strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); | |
1700 | strcpy(pnp->device_class, ACPI_BUS_CLASS); | |
b7b30de5 | 1701 | } |
54735266 | 1702 | |
1da177e4 LT |
1703 | break; |
1704 | case ACPI_BUS_TYPE_POWER: | |
c0af4175 | 1705 | acpi_add_id(pnp, ACPI_POWER_HID); |
1da177e4 LT |
1706 | break; |
1707 | case ACPI_BUS_TYPE_PROCESSOR: | |
c0af4175 | 1708 | acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); |
1da177e4 | 1709 | break; |
1da177e4 | 1710 | case ACPI_BUS_TYPE_THERMAL: |
c0af4175 | 1711 | acpi_add_id(pnp, ACPI_THERMAL_HID); |
1da177e4 LT |
1712 | break; |
1713 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
c0af4175 | 1714 | acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); |
1da177e4 LT |
1715 | break; |
1716 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
c0af4175 | 1717 | acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); |
1da177e4 LT |
1718 | break; |
1719 | } | |
1da177e4 LT |
1720 | } |
1721 | ||
c0af4175 TK |
1722 | void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) |
1723 | { | |
1724 | struct acpi_hardware_id *id, *tmp; | |
1725 | ||
1726 | list_for_each_entry_safe(id, tmp, &pnp->ids, list) { | |
1727 | kfree(id->id); | |
1728 | kfree(id); | |
1729 | } | |
1730 | kfree(pnp->unique_id); | |
1731 | } | |
1732 | ||
82c7d5ef RW |
1733 | void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, |
1734 | int type, unsigned long long sta) | |
1da177e4 | 1735 | { |
d43e167d RW |
1736 | INIT_LIST_HEAD(&device->pnp.ids); |
1737 | device->device_type = type; | |
1738 | device->handle = handle; | |
1739 | device->parent = acpi_bus_get_parent(handle); | |
25db115b | 1740 | acpi_set_device_status(device, sta); |
d43e167d | 1741 | acpi_device_get_busid(device); |
c0af4175 | 1742 | acpi_set_pnp_ids(handle, &device->pnp, type); |
d43e167d | 1743 | acpi_bus_get_flags(device); |
2c0d4fe0 | 1744 | device->flags.match_driver = false; |
202317a5 RW |
1745 | device->flags.initialized = true; |
1746 | device->flags.visited = false; | |
cf860be6 RW |
1747 | device_initialize(&device->dev); |
1748 | dev_set_uevent_suppress(&device->dev, true); | |
1749 | } | |
bc3b0772 | 1750 | |
cf860be6 RW |
1751 | void acpi_device_add_finalize(struct acpi_device *device) |
1752 | { | |
1753 | dev_set_uevent_suppress(&device->dev, false); | |
1754 | kobject_uevent(&device->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
1755 | } |
1756 | ||
5c478f49 BH |
1757 | static int acpi_add_single_object(struct acpi_device **child, |
1758 | acpi_handle handle, int type, | |
2c0d4fe0 | 1759 | unsigned long long sta) |
1da177e4 | 1760 | { |
77c24888 BH |
1761 | int result; |
1762 | struct acpi_device *device; | |
29aaefa6 | 1763 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1da177e4 | 1764 | |
36bcbec7 | 1765 | device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
1da177e4 | 1766 | if (!device) { |
6468463a | 1767 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
d550d98d | 1768 | return -ENOMEM; |
1da177e4 | 1769 | } |
1da177e4 | 1770 | |
d43e167d RW |
1771 | acpi_init_device_object(device, handle, type, sta); |
1772 | acpi_bus_get_power_flags(device); | |
d57d09a4 | 1773 | acpi_bus_get_wakeup_device_flags(device); |
1da177e4 | 1774 | |
cf860be6 | 1775 | result = acpi_device_add(device, acpi_device_release); |
d43e167d | 1776 | if (result) { |
718fb0de | 1777 | acpi_device_release(&device->dev); |
d43e167d RW |
1778 | return result; |
1779 | } | |
1da177e4 | 1780 | |
d43e167d | 1781 | acpi_power_add_remove_device(device, true); |
cf860be6 | 1782 | acpi_device_add_finalize(device); |
d43e167d RW |
1783 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
1784 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n", | |
1785 | dev_name(&device->dev), (char *) buffer.pointer, | |
1786 | device->parent ? dev_name(&device->parent->dev) : "(null)")); | |
1787 | kfree(buffer.pointer); | |
1788 | *child = device; | |
1789 | return 0; | |
bf325f95 RW |
1790 | } |
1791 | ||
778cbc1d BH |
1792 | static int acpi_bus_type_and_status(acpi_handle handle, int *type, |
1793 | unsigned long long *sta) | |
1da177e4 | 1794 | { |
778cbc1d BH |
1795 | acpi_status status; |
1796 | acpi_object_type acpi_type; | |
1da177e4 | 1797 | |
778cbc1d | 1798 | status = acpi_get_type(handle, &acpi_type); |
51a85faf | 1799 | if (ACPI_FAILURE(status)) |
778cbc1d | 1800 | return -ENODEV; |
4be44fcd | 1801 | |
778cbc1d | 1802 | switch (acpi_type) { |
51a85faf BH |
1803 | case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ |
1804 | case ACPI_TYPE_DEVICE: | |
778cbc1d BH |
1805 | *type = ACPI_BUS_TYPE_DEVICE; |
1806 | status = acpi_bus_get_status_handle(handle, sta); | |
1807 | if (ACPI_FAILURE(status)) | |
1808 | return -ENODEV; | |
51a85faf BH |
1809 | break; |
1810 | case ACPI_TYPE_PROCESSOR: | |
778cbc1d BH |
1811 | *type = ACPI_BUS_TYPE_PROCESSOR; |
1812 | status = acpi_bus_get_status_handle(handle, sta); | |
1813 | if (ACPI_FAILURE(status)) | |
1814 | return -ENODEV; | |
51a85faf BH |
1815 | break; |
1816 | case ACPI_TYPE_THERMAL: | |
778cbc1d BH |
1817 | *type = ACPI_BUS_TYPE_THERMAL; |
1818 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1819 | break; |
1820 | case ACPI_TYPE_POWER: | |
778cbc1d BH |
1821 | *type = ACPI_BUS_TYPE_POWER; |
1822 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1823 | break; |
1824 | default: | |
778cbc1d | 1825 | return -ENODEV; |
51a85faf | 1826 | } |
1da177e4 | 1827 | |
778cbc1d BH |
1828 | return 0; |
1829 | } | |
1830 | ||
202317a5 RW |
1831 | bool acpi_device_is_present(struct acpi_device *adev) |
1832 | { | |
1833 | if (adev->status.present || adev->status.functional) | |
1834 | return true; | |
1835 | ||
1836 | adev->flags.initialized = false; | |
1837 | return false; | |
1838 | } | |
1839 | ||
4b59cc1f RW |
1840 | static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, |
1841 | char *idstr, | |
1842 | const struct acpi_device_id **matchid) | |
1843 | { | |
1844 | const struct acpi_device_id *devid; | |
1845 | ||
1846 | for (devid = handler->ids; devid->id[0]; devid++) | |
1847 | if (!strcmp((char *)devid->id, idstr)) { | |
1848 | if (matchid) | |
1849 | *matchid = devid; | |
1850 | ||
1851 | return true; | |
1852 | } | |
1853 | ||
1854 | return false; | |
1855 | } | |
1856 | ||
6b772e8f TK |
1857 | static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr, |
1858 | const struct acpi_device_id **matchid) | |
1859 | { | |
1860 | struct acpi_scan_handler *handler; | |
1861 | ||
1862 | list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) | |
1863 | if (acpi_scan_handler_matching(handler, idstr, matchid)) | |
1864 | return handler; | |
1865 | ||
1866 | return NULL; | |
1867 | } | |
1868 | ||
3f8055c3 RW |
1869 | void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) |
1870 | { | |
3f8055c3 RW |
1871 | if (!!hotplug->enabled == !!val) |
1872 | return; | |
1873 | ||
1874 | mutex_lock(&acpi_scan_lock); | |
1875 | ||
1876 | hotplug->enabled = val; | |
3f8055c3 RW |
1877 | |
1878 | mutex_unlock(&acpi_scan_lock); | |
1879 | } | |
1880 | ||
6b772e8f | 1881 | static void acpi_scan_init_hotplug(acpi_handle handle, int type) |
a33ec399 | 1882 | { |
6b772e8f TK |
1883 | struct acpi_device_pnp pnp = {}; |
1884 | struct acpi_hardware_id *hwid; | |
a33ec399 RW |
1885 | struct acpi_scan_handler *handler; |
1886 | ||
6b772e8f TK |
1887 | INIT_LIST_HEAD(&pnp.ids); |
1888 | acpi_set_pnp_ids(handle, &pnp, type); | |
a33ec399 | 1889 | |
6b772e8f | 1890 | if (!pnp.type.hardware_id) |
7a26b530 | 1891 | goto out; |
a33ec399 RW |
1892 | |
1893 | /* | |
1894 | * This relies on the fact that acpi_install_notify_handler() will not | |
1895 | * install the same notify handler routine twice for the same handle. | |
1896 | */ | |
6b772e8f TK |
1897 | list_for_each_entry(hwid, &pnp.ids, list) { |
1898 | handler = acpi_scan_match_handler(hwid->id, NULL); | |
3338db00 | 1899 | if (handler) { |
2cbb14fb TK |
1900 | acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
1901 | acpi_hotplug_notify_cb, handler); | |
6b772e8f TK |
1902 | break; |
1903 | } | |
1904 | } | |
1905 | ||
7a26b530 | 1906 | out: |
6b772e8f | 1907 | acpi_free_pnp_ids(&pnp); |
a33ec399 RW |
1908 | } |
1909 | ||
e3863094 RW |
1910 | static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, |
1911 | void *not_used, void **return_value) | |
778cbc1d | 1912 | { |
805d410f | 1913 | struct acpi_device *device = NULL; |
778cbc1d BH |
1914 | int type; |
1915 | unsigned long long sta; | |
1916 | int result; | |
1917 | ||
4002bf38 RW |
1918 | acpi_bus_get_device(handle, &device); |
1919 | if (device) | |
1920 | goto out; | |
1921 | ||
778cbc1d BH |
1922 | result = acpi_bus_type_and_status(handle, &type, &sta); |
1923 | if (result) | |
1924 | return AE_OK; | |
1925 | ||
82c7d5ef RW |
1926 | if (type == ACPI_BUS_TYPE_POWER) { |
1927 | acpi_add_power_resource(handle); | |
1928 | return AE_OK; | |
1929 | } | |
1930 | ||
6b772e8f | 1931 | acpi_scan_init_hotplug(handle, type); |
a33ec399 | 1932 | |
2c0d4fe0 | 1933 | acpi_add_single_object(&device, handle, type, sta); |
e3b87f8a | 1934 | if (!device) |
51a85faf | 1935 | return AE_CTRL_DEPTH; |
1da177e4 | 1936 | |
4002bf38 | 1937 | out: |
51a85faf BH |
1938 | if (!*return_value) |
1939 | *return_value = device; | |
805d410f | 1940 | |
51a85faf BH |
1941 | return AE_OK; |
1942 | } | |
3fb02738 | 1943 | |
c5698074 | 1944 | static int acpi_scan_attach_handler(struct acpi_device *device) |
ca589f94 | 1945 | { |
c5698074 RW |
1946 | struct acpi_hardware_id *hwid; |
1947 | int ret = 0; | |
ca589f94 | 1948 | |
c5698074 | 1949 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
87b85b3c | 1950 | const struct acpi_device_id *devid; |
c5698074 | 1951 | struct acpi_scan_handler *handler; |
ca589f94 | 1952 | |
c5698074 RW |
1953 | handler = acpi_scan_match_handler(hwid->id, &devid); |
1954 | if (handler) { | |
87b85b3c RW |
1955 | ret = handler->attach(device, devid); |
1956 | if (ret > 0) { | |
1957 | device->handler = handler; | |
c5698074 | 1958 | break; |
87b85b3c | 1959 | } else if (ret < 0) { |
c5698074 | 1960 | break; |
87b85b3c | 1961 | } |
ca589f94 RW |
1962 | } |
1963 | } | |
1964 | return ret; | |
1965 | } | |
1966 | ||
2c22e652 | 1967 | static void acpi_bus_attach(struct acpi_device *device) |
51a85faf | 1968 | { |
2c22e652 | 1969 | struct acpi_device *child; |
ca589f94 | 1970 | int ret; |
3fb02738 | 1971 | |
2c22e652 | 1972 | acpi_bus_get_status(device); |
202317a5 | 1973 | /* Skip devices that are not present. */ |
2c22e652 RW |
1974 | if (!acpi_device_is_present(device)) { |
1975 | device->flags.visited = false; | |
1976 | return; | |
1977 | } | |
3a391a39 | 1978 | if (device->handler) |
2c22e652 | 1979 | goto ok; |
3a391a39 | 1980 | |
202317a5 RW |
1981 | if (!device->flags.initialized) { |
1982 | acpi_bus_update_power(device, NULL); | |
1983 | device->flags.initialized = true; | |
1984 | } | |
2c22e652 | 1985 | device->flags.visited = false; |
ca589f94 | 1986 | ret = acpi_scan_attach_handler(device); |
6931007c | 1987 | if (ret < 0) |
2c22e652 | 1988 | return; |
6931007c RW |
1989 | |
1990 | device->flags.match_driver = true; | |
2c22e652 RW |
1991 | if (!ret) { |
1992 | ret = device_attach(&device->dev); | |
1993 | if (ret < 0) | |
1994 | return; | |
1995 | } | |
202317a5 | 1996 | device->flags.visited = true; |
202317a5 | 1997 | |
2c22e652 RW |
1998 | ok: |
1999 | list_for_each_entry(child, &device->children, node) | |
2000 | acpi_bus_attach(child); | |
1da177e4 | 2001 | } |
1da177e4 | 2002 | |
636458de | 2003 | /** |
b8bd759a | 2004 | * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. |
636458de | 2005 | * @handle: Root of the namespace scope to scan. |
7779688f | 2006 | * |
636458de RW |
2007 | * Scan a given ACPI tree (probably recently hot-plugged) and create and add |
2008 | * found devices. | |
7779688f | 2009 | * |
636458de RW |
2010 | * If no devices were found, -ENODEV is returned, but it does not mean that |
2011 | * there has been a real error. There just have been no suitable ACPI objects | |
2012 | * in the table trunk from which the kernel could create a device and add an | |
2013 | * appropriate driver. | |
3757b948 RW |
2014 | * |
2015 | * Must be called under acpi_scan_lock. | |
7779688f | 2016 | */ |
b8bd759a | 2017 | int acpi_bus_scan(acpi_handle handle) |
3fb02738 | 2018 | { |
b8bd759a | 2019 | void *device = NULL; |
3fb02738 | 2020 | |
b8bd759a RW |
2021 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device))) |
2022 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
2023 | acpi_bus_check_add, NULL, NULL, &device); | |
3fb02738 | 2024 | |
2c22e652 RW |
2025 | if (device) { |
2026 | acpi_bus_attach(device); | |
2027 | return 0; | |
05404d8f | 2028 | } |
2c22e652 | 2029 | return -ENODEV; |
3fb02738 | 2030 | } |
2c22e652 | 2031 | EXPORT_SYMBOL(acpi_bus_scan); |
1da177e4 | 2032 | |
3757b948 | 2033 | /** |
2c22e652 RW |
2034 | * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects. |
2035 | * @adev: Root of the ACPI namespace scope to walk. | |
3757b948 RW |
2036 | * |
2037 | * Must be called under acpi_scan_lock. | |
2038 | */ | |
2c22e652 | 2039 | void acpi_bus_trim(struct acpi_device *adev) |
1da177e4 | 2040 | { |
2c22e652 RW |
2041 | struct acpi_scan_handler *handler = adev->handler; |
2042 | struct acpi_device *child; | |
2043 | ||
2044 | list_for_each_entry_reverse(child, &adev->children, node) | |
2045 | acpi_bus_trim(child); | |
2046 | ||
2047 | if (handler) { | |
2048 | if (handler->detach) | |
2049 | handler->detach(adev); | |
2050 | ||
2051 | adev->handler = NULL; | |
2052 | } else { | |
2053 | device_release_driver(&adev->dev); | |
2054 | } | |
05404d8f | 2055 | /* |
2c22e652 RW |
2056 | * Most likely, the device is going away, so put it into D3cold before |
2057 | * that. | |
05404d8f | 2058 | */ |
2c22e652 RW |
2059 | acpi_device_set_power(adev, ACPI_STATE_D3_COLD); |
2060 | adev->flags.initialized = false; | |
2061 | adev->flags.visited = false; | |
1da177e4 | 2062 | } |
ceaba663 KA |
2063 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
2064 | ||
e8b945c9 | 2065 | static int acpi_bus_scan_fixed(void) |
1da177e4 | 2066 | { |
4be44fcd | 2067 | int result = 0; |
c4168bff | 2068 | |
1da177e4 LT |
2069 | /* |
2070 | * Enumerate all fixed-feature devices. | |
2071 | */ | |
2c0d4fe0 RW |
2072 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { |
2073 | struct acpi_device *device = NULL; | |
2074 | ||
5c478f49 | 2075 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2076 | ACPI_BUS_TYPE_POWER_BUTTON, |
2c0d4fe0 RW |
2077 | ACPI_STA_DEFAULT); |
2078 | if (result) | |
2079 | return result; | |
2080 | ||
88346167 | 2081 | device->flags.match_driver = true; |
2c0d4fe0 RW |
2082 | result = device_attach(&device->dev); |
2083 | if (result < 0) | |
2084 | return result; | |
2085 | ||
c10d7a13 | 2086 | device_init_wakeup(&device->dev, true); |
3fb02738 | 2087 | } |
1da177e4 | 2088 | |
2c0d4fe0 RW |
2089 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { |
2090 | struct acpi_device *device = NULL; | |
2091 | ||
5c478f49 | 2092 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2093 | ACPI_BUS_TYPE_SLEEP_BUTTON, |
2c0d4fe0 RW |
2094 | ACPI_STA_DEFAULT); |
2095 | if (result) | |
2096 | return result; | |
2097 | ||
88346167 | 2098 | device->flags.match_driver = true; |
2c0d4fe0 | 2099 | result = device_attach(&device->dev); |
3fb02738 | 2100 | } |
1da177e4 | 2101 | |
2c0d4fe0 | 2102 | return result < 0 ? result : 0; |
1da177e4 LT |
2103 | } |
2104 | ||
e747f274 | 2105 | int __init acpi_scan_init(void) |
1da177e4 LT |
2106 | { |
2107 | int result; | |
1da177e4 | 2108 | |
5b327265 PM |
2109 | result = bus_register(&acpi_bus_type); |
2110 | if (result) { | |
2111 | /* We don't want to quit even if we failed to add suspend/resume */ | |
2112 | printk(KERN_ERR PREFIX "Could not register bus type\n"); | |
2113 | } | |
2114 | ||
92ef2a25 | 2115 | acpi_pci_root_init(); |
4daeaf68 | 2116 | acpi_pci_link_init(); |
ac212b69 | 2117 | acpi_processor_init(); |
141a297b | 2118 | acpi_platform_init(); |
f58b082a | 2119 | acpi_lpss_init(); |
2fa97feb | 2120 | acpi_cmos_rtc_init(); |
737f1a9f | 2121 | acpi_container_init(); |
0a347644 | 2122 | acpi_memory_hotplug_init(); |
94add0f8 | 2123 | acpi_dock_init(); |
97d9a9e9 | 2124 | |
3757b948 | 2125 | mutex_lock(&acpi_scan_lock); |
1da177e4 LT |
2126 | /* |
2127 | * Enumerate devices in the ACPI namespace. | |
2128 | */ | |
0cd6ac52 RW |
2129 | result = acpi_bus_scan(ACPI_ROOT_OBJECT); |
2130 | if (result) | |
3757b948 | 2131 | goto out; |
1da177e4 | 2132 | |
0cd6ac52 | 2133 | result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); |
1da177e4 | 2134 | if (result) |
3757b948 | 2135 | goto out; |
1da177e4 | 2136 | |
b8bd759a RW |
2137 | result = acpi_bus_scan_fixed(); |
2138 | if (result) { | |
202317a5 RW |
2139 | acpi_detach_data(acpi_root->handle, acpi_scan_drop_device); |
2140 | acpi_device_del(acpi_root); | |
2141 | put_device(&acpi_root->dev); | |
3757b948 | 2142 | goto out; |
b8bd759a | 2143 | } |
1da177e4 | 2144 | |
b8bd759a | 2145 | acpi_update_all_gpes(); |
3757b948 RW |
2146 | |
2147 | out: | |
2148 | mutex_unlock(&acpi_scan_lock); | |
2149 | return result; | |
1da177e4 | 2150 | } |