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Commit | Line | Data |
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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 LT |
14 | |
15 | #include <acpi/acpi_drivers.h> | |
1da177e4 | 16 | |
d783156e RW |
17 | #include <asm/pgtable.h> |
18 | ||
e60cc7a6 BH |
19 | #include "internal.h" |
20 | ||
1da177e4 | 21 | #define _COMPONENT ACPI_BUS_COMPONENT |
f52fd66d | 22 | ACPI_MODULE_NAME("scan"); |
1da177e4 | 23 | #define STRUCT_TO_INT(s) (*((int*)&s)) |
4be44fcd | 24 | extern struct acpi_device *acpi_root; |
1da177e4 LT |
25 | |
26 | #define ACPI_BUS_CLASS "system_bus" | |
29b71a1c | 27 | #define ACPI_BUS_HID "LNXSYBUS" |
1da177e4 LT |
28 | #define ACPI_BUS_DEVICE_NAME "System Bus" |
29 | ||
859ac9a4 BH |
30 | #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent) |
31 | ||
d783156e RW |
32 | #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page) |
33 | ||
683058e3 RW |
34 | /* |
35 | * If set, devices will be hot-removed even if they cannot be put offline | |
36 | * gracefully (from the kernel's standpoint). | |
37 | */ | |
38 | bool acpi_force_hot_remove; | |
39 | ||
620e112c | 40 | static const char *dummy_hid = "device"; |
2b2ae7c7 | 41 | |
e49bd2dd | 42 | static LIST_HEAD(acpi_bus_id_list); |
c511cc19 | 43 | static DEFINE_MUTEX(acpi_scan_lock); |
ca589f94 | 44 | static LIST_HEAD(acpi_scan_handlers_list); |
9090589d | 45 | DEFINE_MUTEX(acpi_device_lock); |
1da177e4 LT |
46 | LIST_HEAD(acpi_wakeup_device_list); |
47 | ||
e49bd2dd | 48 | struct acpi_device_bus_id{ |
bb095854 | 49 | char bus_id[15]; |
e49bd2dd ZR |
50 | unsigned int instance_no; |
51 | struct list_head node; | |
1da177e4 | 52 | }; |
29b71a1c | 53 | |
3757b948 RW |
54 | void acpi_scan_lock_acquire(void) |
55 | { | |
56 | mutex_lock(&acpi_scan_lock); | |
57 | } | |
58 | EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire); | |
59 | ||
60 | void acpi_scan_lock_release(void) | |
61 | { | |
62 | mutex_unlock(&acpi_scan_lock); | |
63 | } | |
64 | EXPORT_SYMBOL_GPL(acpi_scan_lock_release); | |
65 | ||
ca589f94 RW |
66 | int acpi_scan_add_handler(struct acpi_scan_handler *handler) |
67 | { | |
68 | if (!handler || !handler->attach) | |
69 | return -EINVAL; | |
70 | ||
71 | list_add_tail(&handler->list_node, &acpi_scan_handlers_list); | |
72 | return 0; | |
73 | } | |
74 | ||
3f8055c3 RW |
75 | int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler, |
76 | const char *hotplug_profile_name) | |
77 | { | |
78 | int error; | |
79 | ||
80 | error = acpi_scan_add_handler(handler); | |
81 | if (error) | |
82 | return error; | |
83 | ||
84 | acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name); | |
85 | return 0; | |
86 | } | |
87 | ||
29b71a1c TR |
88 | /* |
89 | * Creates hid/cid(s) string needed for modalias and uevent | |
90 | * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: | |
91 | * char *modalias: "acpi:IBM0001:ACPI0001" | |
92 | */ | |
b3e572d2 AB |
93 | static int create_modalias(struct acpi_device *acpi_dev, char *modalias, |
94 | int size) | |
95 | { | |
29b71a1c | 96 | int len; |
5c9fcb5d | 97 | int count; |
7f47fa6c | 98 | struct acpi_hardware_id *id; |
29b71a1c | 99 | |
2b2ae7c7 TR |
100 | if (list_empty(&acpi_dev->pnp.ids)) |
101 | return 0; | |
102 | ||
5c9fcb5d | 103 | len = snprintf(modalias, size, "acpi:"); |
29b71a1c TR |
104 | size -= len; |
105 | ||
7f47fa6c BH |
106 | list_for_each_entry(id, &acpi_dev->pnp.ids, list) { |
107 | count = snprintf(&modalias[len], size, "%s:", id->id); | |
5c9fcb5d ZR |
108 | if (count < 0 || count >= size) |
109 | return -EINVAL; | |
110 | len += count; | |
111 | size -= count; | |
112 | } | |
113 | ||
29b71a1c TR |
114 | modalias[len] = '\0'; |
115 | return len; | |
116 | } | |
117 | ||
118 | static ssize_t | |
119 | acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
120 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
121 | int len; | |
122 | ||
123 | /* Device has no HID and no CID or string is >1024 */ | |
124 | len = create_modalias(acpi_dev, buf, 1024); | |
125 | if (len <= 0) | |
126 | return 0; | |
127 | buf[len++] = '\n'; | |
128 | return len; | |
129 | } | |
130 | static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); | |
131 | ||
7f28ddec RW |
132 | static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data, |
133 | void **ret_p) | |
683058e3 RW |
134 | { |
135 | struct acpi_device *device = NULL; | |
136 | struct acpi_device_physical_node *pn; | |
303bfdb1 | 137 | bool second_pass = (bool)data; |
683058e3 RW |
138 | acpi_status status = AE_OK; |
139 | ||
140 | if (acpi_bus_get_device(handle, &device)) | |
141 | return AE_OK; | |
142 | ||
7f28ddec RW |
143 | if (device->handler && !device->handler->hotplug.enabled) { |
144 | *ret_p = &device->dev; | |
145 | return AE_SUPPORT; | |
146 | } | |
147 | ||
683058e3 RW |
148 | mutex_lock(&device->physical_node_lock); |
149 | ||
150 | list_for_each_entry(pn, &device->physical_node_list, node) { | |
151 | int ret; | |
152 | ||
303bfdb1 RW |
153 | if (second_pass) { |
154 | /* Skip devices offlined by the first pass. */ | |
155 | if (pn->put_online) | |
156 | continue; | |
157 | } else { | |
158 | pn->put_online = false; | |
159 | } | |
683058e3 RW |
160 | ret = device_offline(pn->dev); |
161 | if (acpi_force_hot_remove) | |
162 | continue; | |
163 | ||
303bfdb1 RW |
164 | if (ret >= 0) { |
165 | pn->put_online = !ret; | |
166 | } else { | |
167 | *ret_p = pn->dev; | |
168 | if (second_pass) { | |
169 | status = AE_ERROR; | |
170 | break; | |
171 | } | |
683058e3 | 172 | } |
683058e3 RW |
173 | } |
174 | ||
175 | mutex_unlock(&device->physical_node_lock); | |
176 | ||
177 | return status; | |
178 | } | |
179 | ||
7f28ddec RW |
180 | static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data, |
181 | void **ret_p) | |
683058e3 RW |
182 | { |
183 | struct acpi_device *device = NULL; | |
184 | struct acpi_device_physical_node *pn; | |
185 | ||
186 | if (acpi_bus_get_device(handle, &device)) | |
187 | return AE_OK; | |
188 | ||
189 | mutex_lock(&device->physical_node_lock); | |
190 | ||
191 | list_for_each_entry(pn, &device->physical_node_list, node) | |
192 | if (pn->put_online) { | |
193 | device_online(pn->dev); | |
194 | pn->put_online = false; | |
195 | } | |
196 | ||
197 | mutex_unlock(&device->physical_node_lock); | |
198 | ||
199 | return AE_OK; | |
200 | } | |
201 | ||
a33ec399 | 202 | static int acpi_scan_hot_remove(struct acpi_device *device) |
1da177e4 | 203 | { |
5993c467 | 204 | acpi_handle handle = device->handle; |
303bfdb1 | 205 | struct device *errdev; |
a33ec399 | 206 | acpi_status status; |
882fd12e | 207 | unsigned long long sta; |
f058cdf4 | 208 | |
303bfdb1 RW |
209 | /* |
210 | * Carry out two passes here and ignore errors in the first pass, | |
211 | * because if the devices in question are memory blocks and | |
212 | * CONFIG_MEMCG is set, one of the blocks may hold data structures | |
213 | * that the other blocks depend on, but it is not known in advance which | |
214 | * block holds them. | |
215 | * | |
216 | * If the first pass is successful, the second one isn't needed, though. | |
217 | */ | |
218 | errdev = NULL; | |
7f28ddec RW |
219 | status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
220 | NULL, acpi_bus_offline, (void *)false, | |
221 | (void **)&errdev); | |
222 | if (status == AE_SUPPORT) { | |
223 | dev_warn(errdev, "Offline disabled.\n"); | |
224 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
225 | acpi_bus_online, NULL, NULL, NULL); | |
7f28ddec RW |
226 | return -EPERM; |
227 | } | |
228 | acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev); | |
303bfdb1 RW |
229 | if (errdev) { |
230 | errdev = NULL; | |
683058e3 | 231 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
7f28ddec RW |
232 | NULL, acpi_bus_offline, (void *)true, |
233 | (void **)&errdev); | |
303bfdb1 | 234 | if (!errdev || acpi_force_hot_remove) |
7f28ddec RW |
235 | acpi_bus_offline(handle, 0, (void *)true, |
236 | (void **)&errdev); | |
303bfdb1 RW |
237 | |
238 | if (errdev && !acpi_force_hot_remove) { | |
239 | dev_warn(errdev, "Offline failed.\n"); | |
7f28ddec | 240 | acpi_bus_online(handle, 0, NULL, NULL); |
303bfdb1 | 241 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, |
7f28ddec RW |
242 | ACPI_UINT32_MAX, acpi_bus_online, |
243 | NULL, NULL, NULL); | |
303bfdb1 RW |
244 | return -EBUSY; |
245 | } | |
683058e3 RW |
246 | } |
247 | ||
26d46867 | 248 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
0794469d | 249 | "Hot-removing device %s...\n", dev_name(&device->dev))); |
26d46867 | 250 | |
bfee26db | 251 | acpi_bus_trim(device); |
683058e3 | 252 | |
7d2421f8 | 253 | acpi_evaluate_lck(handle, 0); |
1da177e4 LT |
254 | /* |
255 | * TBD: _EJD support. | |
256 | */ | |
7d2421f8 JL |
257 | status = acpi_evaluate_ej0(handle); |
258 | if (status == AE_NOT_FOUND) | |
259 | return -ENODEV; | |
260 | else if (ACPI_FAILURE(status)) | |
261 | return -EIO; | |
1da177e4 | 262 | |
882fd12e TK |
263 | /* |
264 | * Verify if eject was indeed successful. If not, log an error | |
265 | * message. No need to call _OST since _EJ0 call was made OK. | |
266 | */ | |
267 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
268 | if (ACPI_FAILURE(status)) { | |
269 | acpi_handle_warn(handle, | |
270 | "Status check after eject failed (0x%x)\n", status); | |
271 | } else if (sta & ACPI_STA_DEVICE_ENABLED) { | |
272 | acpi_handle_warn(handle, | |
273 | "Eject incomplete - status 0x%llx\n", sta); | |
274 | } | |
275 | ||
a33ec399 RW |
276 | return 0; |
277 | } | |
1da177e4 | 278 | |
443fc820 RW |
279 | static int acpi_scan_device_not_present(struct acpi_device *adev) |
280 | { | |
281 | if (!acpi_device_enumerated(adev)) { | |
282 | dev_warn(&adev->dev, "Still not present\n"); | |
283 | return -EALREADY; | |
284 | } | |
285 | acpi_bus_trim(adev); | |
286 | return 0; | |
287 | } | |
288 | ||
c27b2c33 | 289 | static int acpi_scan_device_check(struct acpi_device *adev) |
a33ec399 | 290 | { |
f943db40 | 291 | int error; |
a33ec399 | 292 | |
443fc820 RW |
293 | acpi_bus_get_status(adev); |
294 | if (adev->status.present || adev->status.functional) { | |
295 | /* | |
296 | * This function is only called for device objects for which | |
297 | * matching scan handlers exist. The only situation in which | |
298 | * the scan handler is not attached to this device object yet | |
299 | * is when the device has just appeared (either it wasn't | |
300 | * present at all before or it was removed and then added | |
301 | * again). | |
302 | */ | |
303 | if (adev->handler) { | |
304 | dev_warn(&adev->dev, "Already enumerated\n"); | |
305 | return -EALREADY; | |
306 | } | |
307 | error = acpi_bus_scan(adev->handle); | |
308 | if (error) { | |
309 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
310 | return error; | |
311 | } | |
312 | if (!adev->handler) { | |
313 | dev_warn(&adev->dev, "Enumeration failure\n"); | |
314 | error = -ENODEV; | |
315 | } | |
316 | } else { | |
317 | error = acpi_scan_device_not_present(adev); | |
318 | } | |
319 | return error; | |
320 | } | |
321 | ||
322 | static int acpi_scan_bus_check(struct acpi_device *adev) | |
323 | { | |
324 | struct acpi_scan_handler *handler = adev->handler; | |
325 | struct acpi_device *child; | |
326 | int error; | |
327 | ||
328 | acpi_bus_get_status(adev); | |
329 | if (!(adev->status.present || adev->status.functional)) { | |
330 | acpi_scan_device_not_present(adev); | |
331 | return 0; | |
332 | } | |
333 | if (handler && handler->hotplug.scan_dependent) | |
334 | return handler->hotplug.scan_dependent(adev); | |
335 | ||
c27b2c33 RW |
336 | error = acpi_bus_scan(adev->handle); |
337 | if (error) { | |
338 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
339 | return error; | |
340 | } | |
443fc820 RW |
341 | list_for_each_entry(child, &adev->children, node) { |
342 | error = acpi_scan_bus_check(child); | |
343 | if (error) | |
344 | return error; | |
c27b2c33 RW |
345 | } |
346 | return 0; | |
a33ec399 RW |
347 | } |
348 | ||
3338db00 | 349 | static void acpi_device_hotplug(void *data, u32 src) |
a33ec399 | 350 | { |
a33ec399 | 351 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
c27b2c33 | 352 | struct acpi_device *adev = data; |
a33ec399 RW |
353 | int error; |
354 | ||
683058e3 | 355 | lock_device_hotplug(); |
e0ae8fee | 356 | mutex_lock(&acpi_scan_lock); |
a33ec399 | 357 | |
c27b2c33 RW |
358 | /* |
359 | * The device object's ACPI handle cannot become invalid as long as we | |
360 | * are holding acpi_scan_lock, but it may have become invalid before | |
361 | * that lock was acquired. | |
362 | */ | |
363 | if (adev->handle == INVALID_ACPI_HANDLE) | |
a33ec399 | 364 | goto out; |
c27b2c33 RW |
365 | |
366 | switch (src) { | |
367 | case ACPI_NOTIFY_BUS_CHECK: | |
443fc820 | 368 | error = acpi_scan_bus_check(adev); |
c27b2c33 RW |
369 | break; |
370 | case ACPI_NOTIFY_DEVICE_CHECK: | |
443fc820 | 371 | error = acpi_scan_device_check(adev); |
c27b2c33 RW |
372 | break; |
373 | case ACPI_NOTIFY_EJECT_REQUEST: | |
374 | case ACPI_OST_EC_OSPM_EJECT: | |
375 | error = acpi_scan_hot_remove(adev); | |
376 | break; | |
377 | default: | |
378 | error = -EINVAL; | |
379 | break; | |
a33ec399 | 380 | } |
c27b2c33 RW |
381 | if (!error) |
382 | ost_code = ACPI_OST_SC_SUCCESS; | |
a33ec399 RW |
383 | |
384 | out: | |
c27b2c33 RW |
385 | acpi_evaluate_hotplug_ost(adev->handle, src, ost_code, NULL); |
386 | put_device(&adev->dev); | |
a33ec399 | 387 | mutex_unlock(&acpi_scan_lock); |
e0ae8fee | 388 | unlock_device_hotplug(); |
a33ec399 RW |
389 | } |
390 | ||
2cbb14fb | 391 | static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) |
a33ec399 | 392 | { |
1ceaba05 | 393 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
2cbb14fb | 394 | struct acpi_scan_handler *handler = data; |
a3b1b1ef | 395 | struct acpi_device *adev; |
a33ec399 RW |
396 | acpi_status status; |
397 | ||
c27b2c33 RW |
398 | if (acpi_bus_get_device(handle, &adev)) |
399 | goto err_out; | |
400 | ||
a33ec399 RW |
401 | switch (type) { |
402 | case ACPI_NOTIFY_BUS_CHECK: | |
403 | acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); | |
a33ec399 RW |
404 | break; |
405 | case ACPI_NOTIFY_DEVICE_CHECK: | |
406 | acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); | |
a33ec399 RW |
407 | break; |
408 | case ACPI_NOTIFY_EJECT_REQUEST: | |
409 | acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); | |
1ceaba05 RW |
410 | if (!handler->hotplug.enabled) { |
411 | acpi_handle_err(handle, "Eject disabled\n"); | |
412 | ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; | |
413 | goto err_out; | |
414 | } | |
c27b2c33 RW |
415 | acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, |
416 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); | |
417 | break; | |
a33ec399 RW |
418 | default: |
419 | /* non-hotplug event; possibly handled by other handler */ | |
420 | return; | |
421 | } | |
c27b2c33 RW |
422 | get_device(&adev->dev); |
423 | status = acpi_hotplug_execute(acpi_device_hotplug, adev, type); | |
a3b1b1ef RW |
424 | if (ACPI_SUCCESS(status)) |
425 | return; | |
a33ec399 | 426 | |
c27b2c33 RW |
427 | put_device(&adev->dev); |
428 | ||
a3b1b1ef | 429 | err_out: |
1ceaba05 | 430 | acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); |
1da177e4 LT |
431 | } |
432 | ||
836aedb1 RW |
433 | static ssize_t real_power_state_show(struct device *dev, |
434 | struct device_attribute *attr, char *buf) | |
435 | { | |
436 | struct acpi_device *adev = to_acpi_device(dev); | |
437 | int state; | |
438 | int ret; | |
439 | ||
440 | ret = acpi_device_get_power(adev, &state); | |
441 | if (ret) | |
442 | return ret; | |
443 | ||
444 | return sprintf(buf, "%s\n", acpi_power_state_string(state)); | |
445 | } | |
446 | ||
447 | static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL); | |
448 | ||
449 | static ssize_t power_state_show(struct device *dev, | |
450 | struct device_attribute *attr, char *buf) | |
451 | { | |
452 | struct acpi_device *adev = to_acpi_device(dev); | |
453 | ||
454 | return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state)); | |
455 | } | |
456 | ||
457 | static DEVICE_ATTR(power_state, 0444, power_state_show, NULL); | |
458 | ||
1da177e4 | 459 | static ssize_t |
f883d9db PM |
460 | acpi_eject_store(struct device *d, struct device_attribute *attr, |
461 | const char *buf, size_t count) | |
1da177e4 | 462 | { |
f883d9db | 463 | struct acpi_device *acpi_device = to_acpi_device(d); |
a33ec399 RW |
464 | acpi_object_type not_used; |
465 | acpi_status status; | |
1da177e4 | 466 | |
a33ec399 | 467 | if (!count || buf[0] != '1') |
1da177e4 | 468 | return -EINVAL; |
1da177e4 | 469 | |
a33ec399 RW |
470 | if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled) |
471 | && !acpi_device->driver) | |
472 | return -ENODEV; | |
473 | ||
474 | status = acpi_get_type(acpi_device->handle, ¬_used); | |
475 | if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable) | |
476 | return -ENODEV; | |
477 | ||
f943db40 | 478 | acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, |
a33ec399 | 479 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); |
a33ec399 | 480 | get_device(&acpi_device->dev); |
c27b2c33 | 481 | status = acpi_hotplug_execute(acpi_device_hotplug, acpi_device, |
7b98118a | 482 | ACPI_OST_EC_OSPM_EJECT); |
f943db40 RW |
483 | if (ACPI_SUCCESS(status)) |
484 | return count; | |
a33ec399 | 485 | |
f943db40 | 486 | put_device(&acpi_device->dev); |
f943db40 | 487 | acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, |
a33ec399 | 488 | ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); |
5add99cf | 489 | return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN; |
1da177e4 LT |
490 | } |
491 | ||
f883d9db | 492 | static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); |
1da177e4 | 493 | |
e49bd2dd ZR |
494 | static ssize_t |
495 | acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
496 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
1da177e4 | 497 | |
ea8d82fd | 498 | return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev)); |
1da177e4 | 499 | } |
e49bd2dd | 500 | static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); |
1da177e4 | 501 | |
923d4a45 LZ |
502 | static ssize_t acpi_device_uid_show(struct device *dev, |
503 | struct device_attribute *attr, char *buf) | |
504 | { | |
505 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
506 | ||
507 | return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id); | |
508 | } | |
509 | static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL); | |
510 | ||
511 | static ssize_t acpi_device_adr_show(struct device *dev, | |
512 | struct device_attribute *attr, char *buf) | |
513 | { | |
514 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
515 | ||
516 | return sprintf(buf, "0x%08x\n", | |
517 | (unsigned int)(acpi_dev->pnp.bus_address)); | |
518 | } | |
519 | static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL); | |
520 | ||
e49bd2dd ZR |
521 | static ssize_t |
522 | acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
523 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
524 | struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; | |
525 | int result; | |
1da177e4 | 526 | |
e49bd2dd | 527 | result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); |
0c526d96 | 528 | if (result) |
e49bd2dd | 529 | goto end; |
1da177e4 | 530 | |
e49bd2dd ZR |
531 | result = sprintf(buf, "%s\n", (char*)path.pointer); |
532 | kfree(path.pointer); | |
0c526d96 | 533 | end: |
e49bd2dd | 534 | return result; |
1da177e4 | 535 | } |
e49bd2dd | 536 | static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); |
1da177e4 | 537 | |
d1efe3c3 LO |
538 | /* sysfs file that shows description text from the ACPI _STR method */ |
539 | static ssize_t description_show(struct device *dev, | |
540 | struct device_attribute *attr, | |
541 | char *buf) { | |
542 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
543 | int result; | |
544 | ||
545 | if (acpi_dev->pnp.str_obj == NULL) | |
546 | return 0; | |
547 | ||
548 | /* | |
549 | * The _STR object contains a Unicode identifier for a device. | |
550 | * We need to convert to utf-8 so it can be displayed. | |
551 | */ | |
552 | result = utf16s_to_utf8s( | |
553 | (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer, | |
554 | acpi_dev->pnp.str_obj->buffer.length, | |
555 | UTF16_LITTLE_ENDIAN, buf, | |
556 | PAGE_SIZE); | |
557 | ||
558 | buf[result++] = '\n'; | |
559 | ||
560 | return result; | |
561 | } | |
562 | static DEVICE_ATTR(description, 0444, description_show, NULL); | |
563 | ||
bb74ac23 YI |
564 | static ssize_t |
565 | acpi_device_sun_show(struct device *dev, struct device_attribute *attr, | |
566 | char *buf) { | |
567 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
568 | ||
569 | return sprintf(buf, "%lu\n", acpi_dev->pnp.sun); | |
570 | } | |
571 | static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL); | |
572 | ||
e49bd2dd | 573 | static int acpi_device_setup_files(struct acpi_device *dev) |
1da177e4 | 574 | { |
d1efe3c3 | 575 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
f883d9db | 576 | acpi_status status; |
bb74ac23 | 577 | unsigned long long sun; |
e49bd2dd | 578 | int result = 0; |
1da177e4 LT |
579 | |
580 | /* | |
e49bd2dd | 581 | * Devices gotten from FADT don't have a "path" attribute |
1da177e4 | 582 | */ |
0c526d96 | 583 | if (dev->handle) { |
e49bd2dd | 584 | result = device_create_file(&dev->dev, &dev_attr_path); |
0c526d96 | 585 | if (result) |
e49bd2dd | 586 | goto end; |
1da177e4 LT |
587 | } |
588 | ||
2b2ae7c7 TR |
589 | if (!list_empty(&dev->pnp.ids)) { |
590 | result = device_create_file(&dev->dev, &dev_attr_hid); | |
591 | if (result) | |
592 | goto end; | |
1da177e4 | 593 | |
2b2ae7c7 TR |
594 | result = device_create_file(&dev->dev, &dev_attr_modalias); |
595 | if (result) | |
596 | goto end; | |
597 | } | |
29b71a1c | 598 | |
d1efe3c3 LO |
599 | /* |
600 | * If device has _STR, 'description' file is created | |
601 | */ | |
952c63e9 | 602 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
603 | status = acpi_evaluate_object(dev->handle, "_STR", |
604 | NULL, &buffer); | |
605 | if (ACPI_FAILURE(status)) | |
606 | buffer.pointer = NULL; | |
607 | dev->pnp.str_obj = buffer.pointer; | |
608 | result = device_create_file(&dev->dev, &dev_attr_description); | |
609 | if (result) | |
610 | goto end; | |
611 | } | |
612 | ||
d4e1a692 | 613 | if (dev->pnp.type.bus_address) |
923d4a45 LZ |
614 | result = device_create_file(&dev->dev, &dev_attr_adr); |
615 | if (dev->pnp.unique_id) | |
616 | result = device_create_file(&dev->dev, &dev_attr_uid); | |
617 | ||
bb74ac23 YI |
618 | status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun); |
619 | if (ACPI_SUCCESS(status)) { | |
620 | dev->pnp.sun = (unsigned long)sun; | |
621 | result = device_create_file(&dev->dev, &dev_attr_sun); | |
622 | if (result) | |
623 | goto end; | |
624 | } else { | |
625 | dev->pnp.sun = (unsigned long)-1; | |
626 | } | |
627 | ||
e49bd2dd ZR |
628 | /* |
629 | * If device has _EJ0, 'eject' file is created that is used to trigger | |
630 | * hot-removal function from userland. | |
631 | */ | |
952c63e9 | 632 | if (acpi_has_method(dev->handle, "_EJ0")) { |
e49bd2dd | 633 | result = device_create_file(&dev->dev, &dev_attr_eject); |
836aedb1 RW |
634 | if (result) |
635 | return result; | |
636 | } | |
637 | ||
638 | if (dev->flags.power_manageable) { | |
639 | result = device_create_file(&dev->dev, &dev_attr_power_state); | |
640 | if (result) | |
641 | return result; | |
642 | ||
643 | if (dev->power.flags.power_resources) | |
644 | result = device_create_file(&dev->dev, | |
645 | &dev_attr_real_power_state); | |
646 | } | |
647 | ||
0c526d96 | 648 | end: |
e49bd2dd | 649 | return result; |
1da177e4 LT |
650 | } |
651 | ||
f883d9db | 652 | static void acpi_device_remove_files(struct acpi_device *dev) |
1da177e4 | 653 | { |
836aedb1 RW |
654 | if (dev->flags.power_manageable) { |
655 | device_remove_file(&dev->dev, &dev_attr_power_state); | |
656 | if (dev->power.flags.power_resources) | |
657 | device_remove_file(&dev->dev, | |
658 | &dev_attr_real_power_state); | |
659 | } | |
660 | ||
f883d9db | 661 | /* |
d1efe3c3 LO |
662 | * If device has _STR, remove 'description' file |
663 | */ | |
952c63e9 | 664 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
665 | kfree(dev->pnp.str_obj); |
666 | device_remove_file(&dev->dev, &dev_attr_description); | |
667 | } | |
668 | /* | |
669 | * If device has _EJ0, remove 'eject' file. | |
f883d9db | 670 | */ |
952c63e9 | 671 | if (acpi_has_method(dev->handle, "_EJ0")) |
f883d9db | 672 | device_remove_file(&dev->dev, &dev_attr_eject); |
1da177e4 | 673 | |
952c63e9 | 674 | if (acpi_has_method(dev->handle, "_SUN")) |
bb74ac23 YI |
675 | device_remove_file(&dev->dev, &dev_attr_sun); |
676 | ||
923d4a45 LZ |
677 | if (dev->pnp.unique_id) |
678 | device_remove_file(&dev->dev, &dev_attr_uid); | |
d4e1a692 | 679 | if (dev->pnp.type.bus_address) |
923d4a45 | 680 | device_remove_file(&dev->dev, &dev_attr_adr); |
1131b938 BH |
681 | device_remove_file(&dev->dev, &dev_attr_modalias); |
682 | device_remove_file(&dev->dev, &dev_attr_hid); | |
0c526d96 | 683 | if (dev->handle) |
e49bd2dd | 684 | device_remove_file(&dev->dev, &dev_attr_path); |
1da177e4 | 685 | } |
1da177e4 | 686 | /* -------------------------------------------------------------------------- |
9e89dde2 | 687 | ACPI Bus operations |
1da177e4 | 688 | -------------------------------------------------------------------------- */ |
29b71a1c | 689 | |
cf761af9 MW |
690 | static const struct acpi_device_id *__acpi_match_device( |
691 | struct acpi_device *device, const struct acpi_device_id *ids) | |
29b71a1c TR |
692 | { |
693 | const struct acpi_device_id *id; | |
7f47fa6c | 694 | struct acpi_hardware_id *hwid; |
29b71a1c | 695 | |
39a0ad87 ZY |
696 | /* |
697 | * If the device is not present, it is unnecessary to load device | |
698 | * driver for it. | |
699 | */ | |
700 | if (!device->status.present) | |
cf761af9 | 701 | return NULL; |
39a0ad87 | 702 | |
7f47fa6c BH |
703 | for (id = ids; id->id[0]; id++) |
704 | list_for_each_entry(hwid, &device->pnp.ids, list) | |
705 | if (!strcmp((char *) id->id, hwid->id)) | |
cf761af9 MW |
706 | return id; |
707 | ||
708 | return NULL; | |
709 | } | |
710 | ||
711 | /** | |
712 | * acpi_match_device - Match a struct device against a given list of ACPI IDs | |
713 | * @ids: Array of struct acpi_device_id object to match against. | |
714 | * @dev: The device structure to match. | |
715 | * | |
716 | * Check if @dev has a valid ACPI handle and if there is a struct acpi_device | |
717 | * object for that handle and use that object to match against a given list of | |
718 | * device IDs. | |
719 | * | |
720 | * Return a pointer to the first matching ID on success or %NULL on failure. | |
721 | */ | |
722 | const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, | |
723 | const struct device *dev) | |
724 | { | |
725 | struct acpi_device *adev; | |
0613e1f7 | 726 | acpi_handle handle = ACPI_HANDLE(dev); |
cf761af9 | 727 | |
0613e1f7 | 728 | if (!ids || !handle || acpi_bus_get_device(handle, &adev)) |
cf761af9 MW |
729 | return NULL; |
730 | ||
731 | return __acpi_match_device(adev, ids); | |
732 | } | |
733 | EXPORT_SYMBOL_GPL(acpi_match_device); | |
29b71a1c | 734 | |
cf761af9 MW |
735 | int acpi_match_device_ids(struct acpi_device *device, |
736 | const struct acpi_device_id *ids) | |
737 | { | |
738 | return __acpi_match_device(device, ids) ? 0 : -ENOENT; | |
29b71a1c TR |
739 | } |
740 | EXPORT_SYMBOL(acpi_match_device_ids); | |
741 | ||
0b224527 RW |
742 | static void acpi_free_power_resources_lists(struct acpi_device *device) |
743 | { | |
744 | int i; | |
745 | ||
993cbe59 RW |
746 | if (device->wakeup.flags.valid) |
747 | acpi_power_resources_list_free(&device->wakeup.resources); | |
748 | ||
0b224527 RW |
749 | if (!device->flags.power_manageable) |
750 | return; | |
751 | ||
752 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { | |
753 | struct acpi_device_power_state *ps = &device->power.states[i]; | |
754 | acpi_power_resources_list_free(&ps->resources); | |
755 | } | |
7f47fa6c BH |
756 | } |
757 | ||
1890a97a | 758 | static void acpi_device_release(struct device *dev) |
1da177e4 | 759 | { |
1890a97a | 760 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1da177e4 | 761 | |
c0af4175 | 762 | acpi_free_pnp_ids(&acpi_dev->pnp); |
0b224527 | 763 | acpi_free_power_resources_lists(acpi_dev); |
1890a97a | 764 | kfree(acpi_dev); |
1da177e4 LT |
765 | } |
766 | ||
5d9464a4 | 767 | static int acpi_bus_match(struct device *dev, struct device_driver *drv) |
9e89dde2 | 768 | { |
5d9464a4 PM |
769 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
770 | struct acpi_driver *acpi_drv = to_acpi_driver(drv); | |
1da177e4 | 771 | |
209d3b17 | 772 | return acpi_dev->flags.match_driver |
805d410f | 773 | && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); |
5d9464a4 | 774 | } |
1da177e4 | 775 | |
7eff2e7a | 776 | static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 | 777 | { |
5d9464a4 | 778 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
7eff2e7a | 779 | int len; |
5d9464a4 | 780 | |
2b2ae7c7 TR |
781 | if (list_empty(&acpi_dev->pnp.ids)) |
782 | return 0; | |
783 | ||
7eff2e7a KS |
784 | if (add_uevent_var(env, "MODALIAS=")) |
785 | return -ENOMEM; | |
786 | len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], | |
787 | sizeof(env->buf) - env->buflen); | |
788 | if (len >= (sizeof(env->buf) - env->buflen)) | |
789 | return -ENOMEM; | |
790 | env->buflen += len; | |
9e89dde2 | 791 | return 0; |
1da177e4 LT |
792 | } |
793 | ||
46ec8598 BH |
794 | static void acpi_device_notify(acpi_handle handle, u32 event, void *data) |
795 | { | |
796 | struct acpi_device *device = data; | |
797 | ||
798 | device->driver->ops.notify(device, event); | |
799 | } | |
800 | ||
801 | static acpi_status acpi_device_notify_fixed(void *data) | |
802 | { | |
803 | struct acpi_device *device = data; | |
804 | ||
53de5356 BH |
805 | /* Fixed hardware devices have no handles */ |
806 | acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); | |
46ec8598 BH |
807 | return AE_OK; |
808 | } | |
809 | ||
810 | static int acpi_device_install_notify_handler(struct acpi_device *device) | |
811 | { | |
812 | acpi_status status; | |
46ec8598 | 813 | |
ccba2a36 | 814 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 BH |
815 | status = |
816 | acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, | |
817 | acpi_device_notify_fixed, | |
818 | device); | |
ccba2a36 | 819 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 BH |
820 | status = |
821 | acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, | |
822 | acpi_device_notify_fixed, | |
823 | device); | |
824 | else | |
825 | status = acpi_install_notify_handler(device->handle, | |
826 | ACPI_DEVICE_NOTIFY, | |
827 | acpi_device_notify, | |
828 | device); | |
829 | ||
830 | if (ACPI_FAILURE(status)) | |
831 | return -EINVAL; | |
832 | return 0; | |
833 | } | |
834 | ||
835 | static void acpi_device_remove_notify_handler(struct acpi_device *device) | |
836 | { | |
ccba2a36 | 837 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 BH |
838 | acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
839 | acpi_device_notify_fixed); | |
ccba2a36 | 840 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 BH |
841 | acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, |
842 | acpi_device_notify_fixed); | |
843 | else | |
844 | acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, | |
845 | acpi_device_notify); | |
846 | } | |
847 | ||
d9e455f5 | 848 | static int acpi_device_probe(struct device *dev) |
1da177e4 | 849 | { |
5d9464a4 PM |
850 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
851 | struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); | |
852 | int ret; | |
853 | ||
24071f47 RW |
854 | if (acpi_dev->handler) |
855 | return -EINVAL; | |
856 | ||
d9e455f5 RW |
857 | if (!acpi_drv->ops.add) |
858 | return -ENOSYS; | |
46ec8598 | 859 | |
d9e455f5 RW |
860 | ret = acpi_drv->ops.add(acpi_dev); |
861 | if (ret) | |
862 | return ret; | |
46ec8598 | 863 | |
d9e455f5 RW |
864 | acpi_dev->driver = acpi_drv; |
865 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
866 | "Driver [%s] successfully bound to device [%s]\n", | |
867 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
868 | ||
869 | if (acpi_drv->ops.notify) { | |
870 | ret = acpi_device_install_notify_handler(acpi_dev); | |
871 | if (ret) { | |
872 | if (acpi_drv->ops.remove) | |
873 | acpi_drv->ops.remove(acpi_dev); | |
874 | ||
875 | acpi_dev->driver = NULL; | |
876 | acpi_dev->driver_data = NULL; | |
877 | return ret; | |
878 | } | |
5d9464a4 | 879 | } |
d9e455f5 RW |
880 | |
881 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", | |
882 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
883 | get_device(dev); | |
884 | return 0; | |
5d9464a4 | 885 | } |
1da177e4 | 886 | |
5d9464a4 PM |
887 | static int acpi_device_remove(struct device * dev) |
888 | { | |
889 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
890 | struct acpi_driver *acpi_drv = acpi_dev->driver; | |
891 | ||
892 | if (acpi_drv) { | |
46ec8598 BH |
893 | if (acpi_drv->ops.notify) |
894 | acpi_device_remove_notify_handler(acpi_dev); | |
5d9464a4 | 895 | if (acpi_drv->ops.remove) |
51fac838 | 896 | acpi_drv->ops.remove(acpi_dev); |
1da177e4 | 897 | } |
5d9464a4 | 898 | acpi_dev->driver = NULL; |
db89b4f0 | 899 | acpi_dev->driver_data = NULL; |
1da177e4 | 900 | |
5d9464a4 | 901 | put_device(dev); |
9e89dde2 ZR |
902 | return 0; |
903 | } | |
1da177e4 | 904 | |
55955aad | 905 | struct bus_type acpi_bus_type = { |
9e89dde2 | 906 | .name = "acpi", |
5d9464a4 PM |
907 | .match = acpi_bus_match, |
908 | .probe = acpi_device_probe, | |
909 | .remove = acpi_device_remove, | |
910 | .uevent = acpi_device_uevent, | |
9e89dde2 ZR |
911 | }; |
912 | ||
d783156e RW |
913 | static void acpi_device_del(struct acpi_device *device) |
914 | { | |
915 | mutex_lock(&acpi_device_lock); | |
916 | if (device->parent) | |
917 | list_del(&device->node); | |
918 | ||
919 | list_del(&device->wakeup_list); | |
920 | mutex_unlock(&acpi_device_lock); | |
921 | ||
922 | acpi_power_add_remove_device(device, false); | |
923 | acpi_device_remove_files(device); | |
924 | if (device->remove) | |
925 | device->remove(device); | |
926 | ||
927 | device_del(&device->dev); | |
928 | } | |
929 | ||
930 | static LIST_HEAD(acpi_device_del_list); | |
931 | static DEFINE_MUTEX(acpi_device_del_lock); | |
932 | ||
933 | static void acpi_device_del_work_fn(struct work_struct *work_not_used) | |
934 | { | |
935 | for (;;) { | |
936 | struct acpi_device *adev; | |
937 | ||
938 | mutex_lock(&acpi_device_del_lock); | |
939 | ||
940 | if (list_empty(&acpi_device_del_list)) { | |
941 | mutex_unlock(&acpi_device_del_lock); | |
942 | break; | |
943 | } | |
944 | adev = list_first_entry(&acpi_device_del_list, | |
945 | struct acpi_device, del_list); | |
946 | list_del(&adev->del_list); | |
947 | ||
948 | mutex_unlock(&acpi_device_del_lock); | |
949 | ||
950 | acpi_device_del(adev); | |
951 | /* | |
952 | * Drop references to all power resources that might have been | |
953 | * used by the device. | |
954 | */ | |
955 | acpi_power_transition(adev, ACPI_STATE_D3_COLD); | |
956 | put_device(&adev->dev); | |
957 | } | |
958 | } | |
959 | ||
960 | /** | |
961 | * acpi_scan_drop_device - Drop an ACPI device object. | |
962 | * @handle: Handle of an ACPI namespace node, not used. | |
963 | * @context: Address of the ACPI device object to drop. | |
964 | * | |
965 | * This is invoked by acpi_ns_delete_node() during the removal of the ACPI | |
966 | * namespace node the device object pointed to by @context is attached to. | |
967 | * | |
968 | * The unregistration is carried out asynchronously to avoid running | |
969 | * acpi_device_del() under the ACPICA's namespace mutex and the list is used to | |
970 | * ensure the correct ordering (the device objects must be unregistered in the | |
971 | * same order in which the corresponding namespace nodes are deleted). | |
972 | */ | |
973 | static void acpi_scan_drop_device(acpi_handle handle, void *context) | |
caf5c03f | 974 | { |
d783156e RW |
975 | static DECLARE_WORK(work, acpi_device_del_work_fn); |
976 | struct acpi_device *adev = context; | |
977 | ||
978 | mutex_lock(&acpi_device_del_lock); | |
979 | ||
980 | /* | |
981 | * Use the ACPI hotplug workqueue which is ordered, so this work item | |
982 | * won't run after any hotplug work items submitted subsequently. That | |
983 | * prevents attempts to register device objects identical to those being | |
984 | * deleted from happening concurrently (such attempts result from | |
985 | * hotplug events handled via the ACPI hotplug workqueue). It also will | |
986 | * run after all of the work items submitted previosuly, which helps | |
987 | * those work items to ensure that they are not accessing stale device | |
988 | * objects. | |
989 | */ | |
990 | if (list_empty(&acpi_device_del_list)) | |
991 | acpi_queue_hotplug_work(&work); | |
992 | ||
993 | list_add_tail(&adev->del_list, &acpi_device_del_list); | |
994 | /* Make acpi_ns_validate_handle() return NULL for this handle. */ | |
995 | adev->handle = INVALID_ACPI_HANDLE; | |
996 | ||
997 | mutex_unlock(&acpi_device_del_lock); | |
caf5c03f RW |
998 | } |
999 | ||
1000 | int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) | |
1001 | { | |
1002 | acpi_status status; | |
1003 | ||
1004 | if (!device) | |
1005 | return -EINVAL; | |
1006 | ||
d783156e | 1007 | status = acpi_get_data(handle, acpi_scan_drop_device, (void **)device); |
caf5c03f RW |
1008 | if (ACPI_FAILURE(status) || !*device) { |
1009 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", | |
1010 | handle)); | |
1011 | return -ENODEV; | |
1012 | } | |
1013 | return 0; | |
1014 | } | |
6585925b | 1015 | EXPORT_SYMBOL(acpi_bus_get_device); |
caf5c03f | 1016 | |
cf860be6 RW |
1017 | int acpi_device_add(struct acpi_device *device, |
1018 | void (*release)(struct device *)) | |
1da177e4 | 1019 | { |
4be44fcd | 1020 | int result; |
e49bd2dd ZR |
1021 | struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; |
1022 | int found = 0; | |
66b7ed40 | 1023 | |
d43e167d RW |
1024 | if (device->handle) { |
1025 | acpi_status status; | |
1026 | ||
d783156e | 1027 | status = acpi_attach_data(device->handle, acpi_scan_drop_device, |
d43e167d RW |
1028 | device); |
1029 | if (ACPI_FAILURE(status)) { | |
1030 | acpi_handle_err(device->handle, | |
1031 | "Unable to attach device data\n"); | |
1032 | return -ENODEV; | |
1033 | } | |
1034 | } | |
1035 | ||
9e89dde2 ZR |
1036 | /* |
1037 | * Linkage | |
1038 | * ------- | |
1039 | * Link this device to its parent and siblings. | |
1040 | */ | |
1041 | INIT_LIST_HEAD(&device->children); | |
1042 | INIT_LIST_HEAD(&device->node); | |
9e89dde2 | 1043 | INIT_LIST_HEAD(&device->wakeup_list); |
1033f904 | 1044 | INIT_LIST_HEAD(&device->physical_node_list); |
d783156e | 1045 | INIT_LIST_HEAD(&device->del_list); |
1033f904 | 1046 | mutex_init(&device->physical_node_lock); |
1da177e4 | 1047 | |
e49bd2dd ZR |
1048 | new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); |
1049 | if (!new_bus_id) { | |
d43e167d RW |
1050 | pr_err(PREFIX "Memory allocation error\n"); |
1051 | result = -ENOMEM; | |
1052 | goto err_detach; | |
1da177e4 | 1053 | } |
e49bd2dd | 1054 | |
9090589d | 1055 | mutex_lock(&acpi_device_lock); |
e49bd2dd ZR |
1056 | /* |
1057 | * Find suitable bus_id and instance number in acpi_bus_id_list | |
1058 | * If failed, create one and link it into acpi_bus_id_list | |
1059 | */ | |
1060 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { | |
1131b938 BH |
1061 | if (!strcmp(acpi_device_bus_id->bus_id, |
1062 | acpi_device_hid(device))) { | |
1063 | acpi_device_bus_id->instance_no++; | |
e49bd2dd ZR |
1064 | found = 1; |
1065 | kfree(new_bus_id); | |
1066 | break; | |
1067 | } | |
1da177e4 | 1068 | } |
0c526d96 | 1069 | if (!found) { |
e49bd2dd | 1070 | acpi_device_bus_id = new_bus_id; |
1131b938 | 1071 | strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); |
e49bd2dd ZR |
1072 | acpi_device_bus_id->instance_no = 0; |
1073 | list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); | |
1da177e4 | 1074 | } |
0794469d | 1075 | dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); |
1da177e4 | 1076 | |
33b57150 | 1077 | if (device->parent) |
9e89dde2 | 1078 | list_add_tail(&device->node, &device->parent->children); |
33b57150 | 1079 | |
9e89dde2 ZR |
1080 | if (device->wakeup.flags.valid) |
1081 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); | |
9090589d | 1082 | mutex_unlock(&acpi_device_lock); |
1da177e4 | 1083 | |
1890a97a | 1084 | if (device->parent) |
66b7ed40 | 1085 | device->dev.parent = &device->parent->dev; |
1890a97a | 1086 | device->dev.bus = &acpi_bus_type; |
82c7d5ef | 1087 | device->dev.release = release; |
cf860be6 | 1088 | result = device_add(&device->dev); |
0c526d96 | 1089 | if (result) { |
8b12b922 | 1090 | dev_err(&device->dev, "Error registering device\n"); |
d43e167d | 1091 | goto err; |
1da177e4 | 1092 | } |
1da177e4 | 1093 | |
e49bd2dd | 1094 | result = acpi_device_setup_files(device); |
0c526d96 | 1095 | if (result) |
0794469d KS |
1096 | printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", |
1097 | dev_name(&device->dev)); | |
1da177e4 | 1098 | |
1da177e4 | 1099 | return 0; |
d43e167d RW |
1100 | |
1101 | err: | |
9090589d | 1102 | mutex_lock(&acpi_device_lock); |
33b57150 | 1103 | if (device->parent) |
e49bd2dd | 1104 | list_del(&device->node); |
e49bd2dd | 1105 | list_del(&device->wakeup_list); |
9090589d | 1106 | mutex_unlock(&acpi_device_lock); |
d43e167d RW |
1107 | |
1108 | err_detach: | |
d783156e | 1109 | acpi_detach_data(device->handle, acpi_scan_drop_device); |
e49bd2dd | 1110 | return result; |
1da177e4 LT |
1111 | } |
1112 | ||
9e89dde2 ZR |
1113 | /* -------------------------------------------------------------------------- |
1114 | Driver Management | |
1115 | -------------------------------------------------------------------------- */ | |
9e89dde2 ZR |
1116 | /** |
1117 | * acpi_bus_register_driver - register a driver with the ACPI bus | |
1118 | * @driver: driver being registered | |
1119 | * | |
1120 | * Registers a driver with the ACPI bus. Searches the namespace for all | |
1121 | * devices that match the driver's criteria and binds. Returns zero for | |
1122 | * success or a negative error status for failure. | |
1123 | */ | |
1124 | int acpi_bus_register_driver(struct acpi_driver *driver) | |
1da177e4 | 1125 | { |
1890a97a | 1126 | int ret; |
1da177e4 | 1127 | |
9e89dde2 ZR |
1128 | if (acpi_disabled) |
1129 | return -ENODEV; | |
1890a97a PM |
1130 | driver->drv.name = driver->name; |
1131 | driver->drv.bus = &acpi_bus_type; | |
1132 | driver->drv.owner = driver->owner; | |
1da177e4 | 1133 | |
1890a97a PM |
1134 | ret = driver_register(&driver->drv); |
1135 | return ret; | |
9e89dde2 | 1136 | } |
1da177e4 | 1137 | |
9e89dde2 ZR |
1138 | EXPORT_SYMBOL(acpi_bus_register_driver); |
1139 | ||
1140 | /** | |
b27b14ce | 1141 | * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus |
9e89dde2 ZR |
1142 | * @driver: driver to unregister |
1143 | * | |
1144 | * Unregisters a driver with the ACPI bus. Searches the namespace for all | |
1145 | * devices that match the driver's criteria and unbinds. | |
1146 | */ | |
1147 | void acpi_bus_unregister_driver(struct acpi_driver *driver) | |
1148 | { | |
1890a97a | 1149 | driver_unregister(&driver->drv); |
9e89dde2 ZR |
1150 | } |
1151 | ||
1152 | EXPORT_SYMBOL(acpi_bus_unregister_driver); | |
1153 | ||
9e89dde2 ZR |
1154 | /* -------------------------------------------------------------------------- |
1155 | Device Enumeration | |
1156 | -------------------------------------------------------------------------- */ | |
5c478f49 BH |
1157 | static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) |
1158 | { | |
456de893 | 1159 | struct acpi_device *device = NULL; |
5c478f49 | 1160 | acpi_status status; |
5c478f49 BH |
1161 | |
1162 | /* | |
1163 | * Fixed hardware devices do not appear in the namespace and do not | |
1164 | * have handles, but we fabricate acpi_devices for them, so we have | |
1165 | * to deal with them specially. | |
1166 | */ | |
456de893 | 1167 | if (!handle) |
5c478f49 BH |
1168 | return acpi_root; |
1169 | ||
1170 | do { | |
1171 | status = acpi_get_parent(handle, &handle); | |
5c478f49 | 1172 | if (ACPI_FAILURE(status)) |
456de893 RW |
1173 | return status == AE_NULL_ENTRY ? NULL : acpi_root; |
1174 | } while (acpi_bus_get_device(handle, &device)); | |
1175 | return device; | |
5c478f49 BH |
1176 | } |
1177 | ||
9e89dde2 ZR |
1178 | acpi_status |
1179 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) | |
1180 | { | |
1181 | acpi_status status; | |
1182 | acpi_handle tmp; | |
1183 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
1184 | union acpi_object *obj; | |
1185 | ||
1186 | status = acpi_get_handle(handle, "_EJD", &tmp); | |
1187 | if (ACPI_FAILURE(status)) | |
1188 | return status; | |
1189 | ||
1190 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); | |
1191 | if (ACPI_SUCCESS(status)) { | |
1192 | obj = buffer.pointer; | |
3b5fee59 HM |
1193 | status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, |
1194 | ejd); | |
9e89dde2 ZR |
1195 | kfree(buffer.pointer); |
1196 | } | |
1197 | return status; | |
1198 | } | |
1199 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); | |
1200 | ||
e88c9c60 RW |
1201 | static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle, |
1202 | struct acpi_device_wakeup *wakeup) | |
9e89dde2 | 1203 | { |
b581a7f9 RW |
1204 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1205 | union acpi_object *package = NULL; | |
9e89dde2 | 1206 | union acpi_object *element = NULL; |
b581a7f9 | 1207 | acpi_status status; |
e88c9c60 | 1208 | int err = -ENODATA; |
9e89dde2 | 1209 | |
b581a7f9 | 1210 | if (!wakeup) |
e88c9c60 | 1211 | return -EINVAL; |
9e89dde2 | 1212 | |
993cbe59 | 1213 | INIT_LIST_HEAD(&wakeup->resources); |
9e89dde2 | 1214 | |
b581a7f9 RW |
1215 | /* _PRW */ |
1216 | status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); | |
1217 | if (ACPI_FAILURE(status)) { | |
1218 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); | |
e88c9c60 | 1219 | return err; |
b581a7f9 RW |
1220 | } |
1221 | ||
1222 | package = (union acpi_object *)buffer.pointer; | |
1223 | ||
e88c9c60 | 1224 | if (!package || package->package.count < 2) |
b581a7f9 | 1225 | goto out; |
b581a7f9 | 1226 | |
9e89dde2 | 1227 | element = &(package->package.elements[0]); |
e88c9c60 | 1228 | if (!element) |
b581a7f9 | 1229 | goto out; |
e88c9c60 | 1230 | |
9e89dde2 ZR |
1231 | if (element->type == ACPI_TYPE_PACKAGE) { |
1232 | if ((element->package.count < 2) || | |
1233 | (element->package.elements[0].type != | |
1234 | ACPI_TYPE_LOCAL_REFERENCE) | |
e88c9c60 | 1235 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
b581a7f9 | 1236 | goto out; |
e88c9c60 | 1237 | |
b581a7f9 | 1238 | wakeup->gpe_device = |
9e89dde2 | 1239 | element->package.elements[0].reference.handle; |
b581a7f9 | 1240 | wakeup->gpe_number = |
9e89dde2 ZR |
1241 | (u32) element->package.elements[1].integer.value; |
1242 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
b581a7f9 RW |
1243 | wakeup->gpe_device = NULL; |
1244 | wakeup->gpe_number = element->integer.value; | |
1245 | } else { | |
b581a7f9 RW |
1246 | goto out; |
1247 | } | |
9e89dde2 ZR |
1248 | |
1249 | element = &(package->package.elements[1]); | |
e88c9c60 | 1250 | if (element->type != ACPI_TYPE_INTEGER) |
b581a7f9 | 1251 | goto out; |
e88c9c60 | 1252 | |
b581a7f9 | 1253 | wakeup->sleep_state = element->integer.value; |
9e89dde2 | 1254 | |
e88c9c60 RW |
1255 | err = acpi_extract_power_resources(package, 2, &wakeup->resources); |
1256 | if (err) | |
b581a7f9 | 1257 | goto out; |
9e89dde2 | 1258 | |
0596a52b RW |
1259 | if (!list_empty(&wakeup->resources)) { |
1260 | int sleep_state; | |
9e89dde2 | 1261 | |
b5d667eb RW |
1262 | err = acpi_power_wakeup_list_init(&wakeup->resources, |
1263 | &sleep_state); | |
1264 | if (err) { | |
1265 | acpi_handle_warn(handle, "Retrieving current states " | |
1266 | "of wakeup power resources failed\n"); | |
1267 | acpi_power_resources_list_free(&wakeup->resources); | |
1268 | goto out; | |
1269 | } | |
0596a52b RW |
1270 | if (sleep_state < wakeup->sleep_state) { |
1271 | acpi_handle_warn(handle, "Overriding _PRW sleep state " | |
1272 | "(S%d) by S%d from power resources\n", | |
1273 | (int)wakeup->sleep_state, sleep_state); | |
1274 | wakeup->sleep_state = sleep_state; | |
1275 | } | |
1276 | } | |
bba63a29 | 1277 | acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number); |
9874647b | 1278 | |
b581a7f9 RW |
1279 | out: |
1280 | kfree(buffer.pointer); | |
e88c9c60 | 1281 | return err; |
1da177e4 LT |
1282 | } |
1283 | ||
f517709d | 1284 | static void acpi_bus_set_run_wake_flags(struct acpi_device *device) |
1da177e4 | 1285 | { |
29b71a1c | 1286 | struct acpi_device_id button_device_ids[] = { |
29b71a1c | 1287 | {"PNP0C0C", 0}, |
b7e38304 | 1288 | {"PNP0C0D", 0}, |
29b71a1c TR |
1289 | {"PNP0C0E", 0}, |
1290 | {"", 0}, | |
1291 | }; | |
f517709d RW |
1292 | acpi_status status; |
1293 | acpi_event_status event_status; | |
1294 | ||
b67ea761 | 1295 | device->wakeup.flags.notifier_present = 0; |
f517709d RW |
1296 | |
1297 | /* Power button, Lid switch always enable wakeup */ | |
1298 | if (!acpi_match_device_ids(device, button_device_ids)) { | |
1299 | device->wakeup.flags.run_wake = 1; | |
b7e38304 ZR |
1300 | if (!acpi_match_device_ids(device, &button_device_ids[1])) { |
1301 | /* Do not use Lid/sleep button for S5 wakeup */ | |
1302 | if (device->wakeup.sleep_state == ACPI_STATE_S5) | |
1303 | device->wakeup.sleep_state = ACPI_STATE_S4; | |
1304 | } | |
f2b56bc8 | 1305 | device_set_wakeup_capable(&device->dev, true); |
f517709d RW |
1306 | return; |
1307 | } | |
1308 | ||
e8e18c95 RW |
1309 | status = acpi_get_gpe_status(device->wakeup.gpe_device, |
1310 | device->wakeup.gpe_number, | |
1311 | &event_status); | |
f517709d RW |
1312 | if (status == AE_OK) |
1313 | device->wakeup.flags.run_wake = | |
1314 | !!(event_status & ACPI_EVENT_FLAG_HANDLE); | |
1315 | } | |
1316 | ||
d57d09a4 | 1317 | static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
f517709d | 1318 | { |
e88c9c60 | 1319 | int err; |
29b71a1c | 1320 | |
d57d09a4 | 1321 | /* Presence of _PRW indicates wake capable */ |
952c63e9 | 1322 | if (!acpi_has_method(device->handle, "_PRW")) |
d57d09a4 RW |
1323 | return; |
1324 | ||
e88c9c60 RW |
1325 | err = acpi_bus_extract_wakeup_device_power_package(device->handle, |
1326 | &device->wakeup); | |
1327 | if (err) { | |
1328 | dev_err(&device->dev, "_PRW evaluation error: %d\n", err); | |
d57d09a4 | 1329 | return; |
9e89dde2 | 1330 | } |
1da177e4 | 1331 | |
9e89dde2 | 1332 | device->wakeup.flags.valid = 1; |
9b83ccd2 | 1333 | device->wakeup.prepare_count = 0; |
f517709d | 1334 | acpi_bus_set_run_wake_flags(device); |
729b2bdb ZY |
1335 | /* Call _PSW/_DSW object to disable its ability to wake the sleeping |
1336 | * system for the ACPI device with the _PRW object. | |
1337 | * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. | |
1338 | * So it is necessary to call _DSW object first. Only when it is not | |
1339 | * present will the _PSW object used. | |
1340 | */ | |
e88c9c60 RW |
1341 | err = acpi_device_sleep_wake(device, 0, 0, 0); |
1342 | if (err) | |
77e76609 RW |
1343 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1344 | "error in _DSW or _PSW evaluation\n")); | |
1da177e4 | 1345 | } |
1da177e4 | 1346 | |
f33ce568 RW |
1347 | static void acpi_bus_init_power_state(struct acpi_device *device, int state) |
1348 | { | |
1349 | struct acpi_device_power_state *ps = &device->power.states[state]; | |
ef85bdbe RW |
1350 | char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; |
1351 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
f33ce568 | 1352 | acpi_status status; |
bf325f95 | 1353 | |
f33ce568 RW |
1354 | INIT_LIST_HEAD(&ps->resources); |
1355 | ||
ef85bdbe RW |
1356 | /* Evaluate "_PRx" to get referenced power resources */ |
1357 | status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); | |
1358 | if (ACPI_SUCCESS(status)) { | |
1359 | union acpi_object *package = buffer.pointer; | |
1360 | ||
1361 | if (buffer.length && package | |
1362 | && package->type == ACPI_TYPE_PACKAGE | |
1363 | && package->package.count) { | |
e88c9c60 RW |
1364 | int err = acpi_extract_power_resources(package, 0, |
1365 | &ps->resources); | |
1366 | if (!err) | |
ef85bdbe | 1367 | device->power.flags.power_resources = 1; |
f33ce568 | 1368 | } |
ef85bdbe | 1369 | ACPI_FREE(buffer.pointer); |
f33ce568 RW |
1370 | } |
1371 | ||
1372 | /* Evaluate "_PSx" to see if we can do explicit sets */ | |
ef85bdbe | 1373 | pathname[2] = 'S'; |
952c63e9 | 1374 | if (acpi_has_method(device->handle, pathname)) |
f33ce568 RW |
1375 | ps->flags.explicit_set = 1; |
1376 | ||
1377 | /* | |
1378 | * State is valid if there are means to put the device into it. | |
1379 | * D3hot is only valid if _PR3 present. | |
1380 | */ | |
ef85bdbe | 1381 | if (!list_empty(&ps->resources) |
f33ce568 RW |
1382 | || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) { |
1383 | ps->flags.valid = 1; | |
1384 | ps->flags.os_accessible = 1; | |
1385 | } | |
1386 | ||
1387 | ps->power = -1; /* Unknown - driver assigned */ | |
1388 | ps->latency = -1; /* Unknown - driver assigned */ | |
1389 | } | |
1390 | ||
d43e167d | 1391 | static void acpi_bus_get_power_flags(struct acpi_device *device) |
1da177e4 | 1392 | { |
8bc5053b | 1393 | u32 i; |
1a365616 | 1394 | |
d43e167d | 1395 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ |
952c63e9 JL |
1396 | if (!acpi_has_method(device->handle, "_PS0") && |
1397 | !acpi_has_method(device->handle, "_PR0")) | |
1398 | return; | |
1a365616 | 1399 | |
d43e167d | 1400 | device->flags.power_manageable = 1; |
4be44fcd | 1401 | |
9e89dde2 ZR |
1402 | /* |
1403 | * Power Management Flags | |
1404 | */ | |
952c63e9 | 1405 | if (acpi_has_method(device->handle, "_PSC")) |
9e89dde2 | 1406 | device->power.flags.explicit_get = 1; |
952c63e9 | 1407 | if (acpi_has_method(device->handle, "_IRC")) |
9e89dde2 | 1408 | device->power.flags.inrush_current = 1; |
1da177e4 | 1409 | |
9e89dde2 ZR |
1410 | /* |
1411 | * Enumerate supported power management states | |
1412 | */ | |
f33ce568 RW |
1413 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) |
1414 | acpi_bus_init_power_state(device, i); | |
bf325f95 | 1415 | |
0b224527 | 1416 | INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); |
1da177e4 | 1417 | |
9e89dde2 ZR |
1418 | /* Set defaults for D0 and D3 states (always valid) */ |
1419 | device->power.states[ACPI_STATE_D0].flags.valid = 1; | |
1420 | device->power.states[ACPI_STATE_D0].power = 100; | |
8ad928d5 RW |
1421 | device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; |
1422 | device->power.states[ACPI_STATE_D3_COLD].power = 0; | |
c8f7a62c | 1423 | |
5c7dd710 RW |
1424 | /* Set D3cold's explicit_set flag if _PS3 exists. */ |
1425 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set) | |
1426 | device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1; | |
1427 | ||
1399dfcd AL |
1428 | /* Presence of _PS3 or _PRx means we can put the device into D3 cold */ |
1429 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set || | |
1430 | device->power.flags.power_resources) | |
1431 | device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1; | |
1432 | ||
b3785492 RW |
1433 | if (acpi_bus_init_power(device)) { |
1434 | acpi_free_power_resources_lists(device); | |
1435 | device->flags.power_manageable = 0; | |
1436 | } | |
9e89dde2 | 1437 | } |
c8f7a62c | 1438 | |
d43e167d | 1439 | static void acpi_bus_get_flags(struct acpi_device *device) |
1da177e4 | 1440 | { |
1da177e4 | 1441 | /* Presence of _STA indicates 'dynamic_status' */ |
952c63e9 | 1442 | if (acpi_has_method(device->handle, "_STA")) |
1da177e4 LT |
1443 | device->flags.dynamic_status = 1; |
1444 | ||
1da177e4 | 1445 | /* Presence of _RMV indicates 'removable' */ |
952c63e9 | 1446 | if (acpi_has_method(device->handle, "_RMV")) |
1da177e4 LT |
1447 | device->flags.removable = 1; |
1448 | ||
1449 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ | |
952c63e9 JL |
1450 | if (acpi_has_method(device->handle, "_EJD") || |
1451 | acpi_has_method(device->handle, "_EJ0")) | |
1da177e4 | 1452 | device->flags.ejectable = 1; |
1da177e4 LT |
1453 | } |
1454 | ||
c7bcb4e9 | 1455 | static void acpi_device_get_busid(struct acpi_device *device) |
1da177e4 | 1456 | { |
4be44fcd LB |
1457 | char bus_id[5] = { '?', 0 }; |
1458 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; | |
1459 | int i = 0; | |
1da177e4 LT |
1460 | |
1461 | /* | |
1462 | * Bus ID | |
1463 | * ------ | |
1464 | * The device's Bus ID is simply the object name. | |
1465 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? | |
1466 | */ | |
859ac9a4 | 1467 | if (ACPI_IS_ROOT_DEVICE(device)) { |
1da177e4 | 1468 | strcpy(device->pnp.bus_id, "ACPI"); |
859ac9a4 BH |
1469 | return; |
1470 | } | |
1471 | ||
1472 | switch (device->device_type) { | |
1da177e4 LT |
1473 | case ACPI_BUS_TYPE_POWER_BUTTON: |
1474 | strcpy(device->pnp.bus_id, "PWRF"); | |
1475 | break; | |
1476 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
1477 | strcpy(device->pnp.bus_id, "SLPF"); | |
1478 | break; | |
1479 | default: | |
66b7ed40 | 1480 | acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); |
1da177e4 LT |
1481 | /* Clean up trailing underscores (if any) */ |
1482 | for (i = 3; i > 1; i--) { | |
1483 | if (bus_id[i] == '_') | |
1484 | bus_id[i] = '\0'; | |
1485 | else | |
1486 | break; | |
1487 | } | |
1488 | strcpy(device->pnp.bus_id, bus_id); | |
1489 | break; | |
1490 | } | |
1491 | } | |
1492 | ||
ebf4df8d JL |
1493 | /* |
1494 | * acpi_ata_match - see if an acpi object is an ATA device | |
1495 | * | |
1496 | * If an acpi object has one of the ACPI ATA methods defined, | |
1497 | * then we can safely call it an ATA device. | |
1498 | */ | |
1499 | bool acpi_ata_match(acpi_handle handle) | |
1500 | { | |
1501 | return acpi_has_method(handle, "_GTF") || | |
1502 | acpi_has_method(handle, "_GTM") || | |
1503 | acpi_has_method(handle, "_STM") || | |
1504 | acpi_has_method(handle, "_SDD"); | |
1505 | } | |
1506 | ||
54735266 | 1507 | /* |
d4e1a692 | 1508 | * acpi_bay_match - see if an acpi object is an ejectable driver bay |
54735266 ZR |
1509 | * |
1510 | * If an acpi object is ejectable and has one of the ACPI ATA methods defined, | |
1511 | * then we can safely call it an ejectable drive bay | |
1512 | */ | |
ebf4df8d | 1513 | bool acpi_bay_match(acpi_handle handle) |
d4e1a692 | 1514 | { |
54735266 ZR |
1515 | acpi_handle phandle; |
1516 | ||
952c63e9 | 1517 | if (!acpi_has_method(handle, "_EJ0")) |
ebf4df8d JL |
1518 | return false; |
1519 | if (acpi_ata_match(handle)) | |
1520 | return true; | |
1521 | if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) | |
1522 | return false; | |
54735266 | 1523 | |
ebf4df8d | 1524 | return acpi_ata_match(phandle); |
54735266 ZR |
1525 | } |
1526 | ||
3620f2f2 | 1527 | /* |
d4e1a692 | 1528 | * acpi_dock_match - see if an acpi object has a _DCK method |
3620f2f2 | 1529 | */ |
ebf4df8d | 1530 | bool acpi_dock_match(acpi_handle handle) |
3620f2f2 | 1531 | { |
ebf4df8d | 1532 | return acpi_has_method(handle, "_DCK"); |
3620f2f2 FS |
1533 | } |
1534 | ||
620e112c | 1535 | const char *acpi_device_hid(struct acpi_device *device) |
15b8dd53 | 1536 | { |
7f47fa6c | 1537 | struct acpi_hardware_id *hid; |
15b8dd53 | 1538 | |
2b2ae7c7 TR |
1539 | if (list_empty(&device->pnp.ids)) |
1540 | return dummy_hid; | |
1541 | ||
7f47fa6c BH |
1542 | hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); |
1543 | return hid->id; | |
1544 | } | |
1545 | EXPORT_SYMBOL(acpi_device_hid); | |
15b8dd53 | 1546 | |
d4e1a692 | 1547 | static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) |
7f47fa6c BH |
1548 | { |
1549 | struct acpi_hardware_id *id; | |
15b8dd53 | 1550 | |
7f47fa6c BH |
1551 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
1552 | if (!id) | |
1553 | return; | |
15b8dd53 | 1554 | |
581de59e | 1555 | id->id = kstrdup(dev_id, GFP_KERNEL); |
7f47fa6c BH |
1556 | if (!id->id) { |
1557 | kfree(id); | |
1558 | return; | |
15b8dd53 BM |
1559 | } |
1560 | ||
d4e1a692 TK |
1561 | list_add_tail(&id->list, &pnp->ids); |
1562 | pnp->type.hardware_id = 1; | |
15b8dd53 BM |
1563 | } |
1564 | ||
222e82ac DW |
1565 | /* |
1566 | * Old IBM workstations have a DSDT bug wherein the SMBus object | |
1567 | * lacks the SMBUS01 HID and the methods do not have the necessary "_" | |
1568 | * prefix. Work around this. | |
1569 | */ | |
ebf4df8d | 1570 | static bool acpi_ibm_smbus_match(acpi_handle handle) |
222e82ac | 1571 | { |
ebf4df8d JL |
1572 | char node_name[ACPI_PATH_SEGMENT_LENGTH]; |
1573 | struct acpi_buffer path = { sizeof(node_name), node_name }; | |
222e82ac DW |
1574 | |
1575 | if (!dmi_name_in_vendors("IBM")) | |
ebf4df8d | 1576 | return false; |
222e82ac DW |
1577 | |
1578 | /* Look for SMBS object */ | |
ebf4df8d JL |
1579 | if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || |
1580 | strcmp("SMBS", path.pointer)) | |
1581 | return false; | |
222e82ac DW |
1582 | |
1583 | /* Does it have the necessary (but misnamed) methods? */ | |
952c63e9 JL |
1584 | if (acpi_has_method(handle, "SBI") && |
1585 | acpi_has_method(handle, "SBR") && | |
1586 | acpi_has_method(handle, "SBW")) | |
ebf4df8d JL |
1587 | return true; |
1588 | ||
1589 | return false; | |
222e82ac DW |
1590 | } |
1591 | ||
c0af4175 TK |
1592 | static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, |
1593 | int device_type) | |
1da177e4 | 1594 | { |
4be44fcd | 1595 | acpi_status status; |
57f3674f | 1596 | struct acpi_device_info *info; |
78e25fef | 1597 | struct acpi_pnp_device_id_list *cid_list; |
7f47fa6c | 1598 | int i; |
1da177e4 | 1599 | |
c0af4175 | 1600 | switch (device_type) { |
1da177e4 | 1601 | case ACPI_BUS_TYPE_DEVICE: |
c0af4175 TK |
1602 | if (handle == ACPI_ROOT_OBJECT) { |
1603 | acpi_add_id(pnp, ACPI_SYSTEM_HID); | |
859ac9a4 BH |
1604 | break; |
1605 | } | |
1606 | ||
c0af4175 | 1607 | status = acpi_get_object_info(handle, &info); |
1da177e4 | 1608 | if (ACPI_FAILURE(status)) { |
c0af4175 TK |
1609 | pr_err(PREFIX "%s: Error reading device info\n", |
1610 | __func__); | |
1da177e4 LT |
1611 | return; |
1612 | } | |
1613 | ||
1da177e4 | 1614 | if (info->valid & ACPI_VALID_HID) |
c0af4175 | 1615 | acpi_add_id(pnp, info->hardware_id.string); |
57f3674f | 1616 | if (info->valid & ACPI_VALID_CID) { |
15b8dd53 | 1617 | cid_list = &info->compatible_id_list; |
57f3674f | 1618 | for (i = 0; i < cid_list->count; i++) |
c0af4175 | 1619 | acpi_add_id(pnp, cid_list->ids[i].string); |
57f3674f | 1620 | } |
1da177e4 | 1621 | if (info->valid & ACPI_VALID_ADR) { |
c0af4175 TK |
1622 | pnp->bus_address = info->address; |
1623 | pnp->type.bus_address = 1; | |
1da177e4 | 1624 | } |
ccf78040 | 1625 | if (info->valid & ACPI_VALID_UID) |
c0af4175 | 1626 | pnp->unique_id = kstrdup(info->unique_id.string, |
ccf78040 | 1627 | GFP_KERNEL); |
ae843332 | 1628 | |
a83893ae BH |
1629 | kfree(info); |
1630 | ||
57f3674f BH |
1631 | /* |
1632 | * Some devices don't reliably have _HIDs & _CIDs, so add | |
1633 | * synthetic HIDs to make sure drivers can find them. | |
1634 | */ | |
c0af4175 TK |
1635 | if (acpi_is_video_device(handle)) |
1636 | acpi_add_id(pnp, ACPI_VIDEO_HID); | |
ebf4df8d | 1637 | else if (acpi_bay_match(handle)) |
c0af4175 | 1638 | acpi_add_id(pnp, ACPI_BAY_HID); |
ebf4df8d | 1639 | else if (acpi_dock_match(handle)) |
c0af4175 | 1640 | acpi_add_id(pnp, ACPI_DOCK_HID); |
ebf4df8d | 1641 | else if (acpi_ibm_smbus_match(handle)) |
c0af4175 TK |
1642 | acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); |
1643 | else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) { | |
1644 | acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */ | |
1645 | strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); | |
1646 | strcpy(pnp->device_class, ACPI_BUS_CLASS); | |
b7b30de5 | 1647 | } |
54735266 | 1648 | |
1da177e4 LT |
1649 | break; |
1650 | case ACPI_BUS_TYPE_POWER: | |
c0af4175 | 1651 | acpi_add_id(pnp, ACPI_POWER_HID); |
1da177e4 LT |
1652 | break; |
1653 | case ACPI_BUS_TYPE_PROCESSOR: | |
c0af4175 | 1654 | acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); |
1da177e4 | 1655 | break; |
1da177e4 | 1656 | case ACPI_BUS_TYPE_THERMAL: |
c0af4175 | 1657 | acpi_add_id(pnp, ACPI_THERMAL_HID); |
1da177e4 LT |
1658 | break; |
1659 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
c0af4175 | 1660 | acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); |
1da177e4 LT |
1661 | break; |
1662 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
c0af4175 | 1663 | acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); |
1da177e4 LT |
1664 | break; |
1665 | } | |
1da177e4 LT |
1666 | } |
1667 | ||
c0af4175 TK |
1668 | void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) |
1669 | { | |
1670 | struct acpi_hardware_id *id, *tmp; | |
1671 | ||
1672 | list_for_each_entry_safe(id, tmp, &pnp->ids, list) { | |
1673 | kfree(id->id); | |
1674 | kfree(id); | |
1675 | } | |
1676 | kfree(pnp->unique_id); | |
1677 | } | |
1678 | ||
82c7d5ef RW |
1679 | void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, |
1680 | int type, unsigned long long sta) | |
1da177e4 | 1681 | { |
d43e167d RW |
1682 | INIT_LIST_HEAD(&device->pnp.ids); |
1683 | device->device_type = type; | |
1684 | device->handle = handle; | |
1685 | device->parent = acpi_bus_get_parent(handle); | |
1686 | STRUCT_TO_INT(device->status) = sta; | |
1687 | acpi_device_get_busid(device); | |
c0af4175 | 1688 | acpi_set_pnp_ids(handle, &device->pnp, type); |
d43e167d | 1689 | acpi_bus_get_flags(device); |
2c0d4fe0 | 1690 | device->flags.match_driver = false; |
202317a5 RW |
1691 | device->flags.initialized = true; |
1692 | device->flags.visited = false; | |
cf860be6 RW |
1693 | device_initialize(&device->dev); |
1694 | dev_set_uevent_suppress(&device->dev, true); | |
1695 | } | |
bc3b0772 | 1696 | |
cf860be6 RW |
1697 | void acpi_device_add_finalize(struct acpi_device *device) |
1698 | { | |
1699 | dev_set_uevent_suppress(&device->dev, false); | |
1700 | kobject_uevent(&device->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
1701 | } |
1702 | ||
5c478f49 BH |
1703 | static int acpi_add_single_object(struct acpi_device **child, |
1704 | acpi_handle handle, int type, | |
2c0d4fe0 | 1705 | unsigned long long sta) |
1da177e4 | 1706 | { |
77c24888 BH |
1707 | int result; |
1708 | struct acpi_device *device; | |
29aaefa6 | 1709 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1da177e4 | 1710 | |
36bcbec7 | 1711 | device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
1da177e4 | 1712 | if (!device) { |
6468463a | 1713 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
d550d98d | 1714 | return -ENOMEM; |
1da177e4 | 1715 | } |
1da177e4 | 1716 | |
d43e167d RW |
1717 | acpi_init_device_object(device, handle, type, sta); |
1718 | acpi_bus_get_power_flags(device); | |
d57d09a4 | 1719 | acpi_bus_get_wakeup_device_flags(device); |
1da177e4 | 1720 | |
cf860be6 | 1721 | result = acpi_device_add(device, acpi_device_release); |
d43e167d | 1722 | if (result) { |
718fb0de | 1723 | acpi_device_release(&device->dev); |
d43e167d RW |
1724 | return result; |
1725 | } | |
1da177e4 | 1726 | |
d43e167d | 1727 | acpi_power_add_remove_device(device, true); |
cf860be6 | 1728 | acpi_device_add_finalize(device); |
d43e167d RW |
1729 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
1730 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n", | |
1731 | dev_name(&device->dev), (char *) buffer.pointer, | |
1732 | device->parent ? dev_name(&device->parent->dev) : "(null)")); | |
1733 | kfree(buffer.pointer); | |
1734 | *child = device; | |
1735 | return 0; | |
bf325f95 RW |
1736 | } |
1737 | ||
778cbc1d BH |
1738 | static int acpi_bus_type_and_status(acpi_handle handle, int *type, |
1739 | unsigned long long *sta) | |
1da177e4 | 1740 | { |
778cbc1d BH |
1741 | acpi_status status; |
1742 | acpi_object_type acpi_type; | |
1da177e4 | 1743 | |
778cbc1d | 1744 | status = acpi_get_type(handle, &acpi_type); |
51a85faf | 1745 | if (ACPI_FAILURE(status)) |
778cbc1d | 1746 | return -ENODEV; |
4be44fcd | 1747 | |
778cbc1d | 1748 | switch (acpi_type) { |
51a85faf BH |
1749 | case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ |
1750 | case ACPI_TYPE_DEVICE: | |
778cbc1d BH |
1751 | *type = ACPI_BUS_TYPE_DEVICE; |
1752 | status = acpi_bus_get_status_handle(handle, sta); | |
1753 | if (ACPI_FAILURE(status)) | |
1754 | return -ENODEV; | |
51a85faf BH |
1755 | break; |
1756 | case ACPI_TYPE_PROCESSOR: | |
778cbc1d BH |
1757 | *type = ACPI_BUS_TYPE_PROCESSOR; |
1758 | status = acpi_bus_get_status_handle(handle, sta); | |
1759 | if (ACPI_FAILURE(status)) | |
1760 | return -ENODEV; | |
51a85faf BH |
1761 | break; |
1762 | case ACPI_TYPE_THERMAL: | |
778cbc1d BH |
1763 | *type = ACPI_BUS_TYPE_THERMAL; |
1764 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1765 | break; |
1766 | case ACPI_TYPE_POWER: | |
778cbc1d BH |
1767 | *type = ACPI_BUS_TYPE_POWER; |
1768 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1769 | break; |
1770 | default: | |
778cbc1d | 1771 | return -ENODEV; |
51a85faf | 1772 | } |
1da177e4 | 1773 | |
778cbc1d BH |
1774 | return 0; |
1775 | } | |
1776 | ||
202317a5 RW |
1777 | bool acpi_device_is_present(struct acpi_device *adev) |
1778 | { | |
1779 | if (adev->status.present || adev->status.functional) | |
1780 | return true; | |
1781 | ||
1782 | adev->flags.initialized = false; | |
1783 | return false; | |
1784 | } | |
1785 | ||
4b59cc1f RW |
1786 | static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, |
1787 | char *idstr, | |
1788 | const struct acpi_device_id **matchid) | |
1789 | { | |
1790 | const struct acpi_device_id *devid; | |
1791 | ||
1792 | for (devid = handler->ids; devid->id[0]; devid++) | |
1793 | if (!strcmp((char *)devid->id, idstr)) { | |
1794 | if (matchid) | |
1795 | *matchid = devid; | |
1796 | ||
1797 | return true; | |
1798 | } | |
1799 | ||
1800 | return false; | |
1801 | } | |
1802 | ||
6b772e8f TK |
1803 | static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr, |
1804 | const struct acpi_device_id **matchid) | |
1805 | { | |
1806 | struct acpi_scan_handler *handler; | |
1807 | ||
1808 | list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) | |
1809 | if (acpi_scan_handler_matching(handler, idstr, matchid)) | |
1810 | return handler; | |
1811 | ||
1812 | return NULL; | |
1813 | } | |
1814 | ||
3f8055c3 RW |
1815 | void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) |
1816 | { | |
3f8055c3 RW |
1817 | if (!!hotplug->enabled == !!val) |
1818 | return; | |
1819 | ||
1820 | mutex_lock(&acpi_scan_lock); | |
1821 | ||
1822 | hotplug->enabled = val; | |
3f8055c3 RW |
1823 | |
1824 | mutex_unlock(&acpi_scan_lock); | |
1825 | } | |
1826 | ||
6b772e8f | 1827 | static void acpi_scan_init_hotplug(acpi_handle handle, int type) |
a33ec399 | 1828 | { |
6b772e8f TK |
1829 | struct acpi_device_pnp pnp = {}; |
1830 | struct acpi_hardware_id *hwid; | |
a33ec399 RW |
1831 | struct acpi_scan_handler *handler; |
1832 | ||
6b772e8f TK |
1833 | INIT_LIST_HEAD(&pnp.ids); |
1834 | acpi_set_pnp_ids(handle, &pnp, type); | |
a33ec399 | 1835 | |
6b772e8f | 1836 | if (!pnp.type.hardware_id) |
7a26b530 | 1837 | goto out; |
a33ec399 RW |
1838 | |
1839 | /* | |
1840 | * This relies on the fact that acpi_install_notify_handler() will not | |
1841 | * install the same notify handler routine twice for the same handle. | |
1842 | */ | |
6b772e8f TK |
1843 | list_for_each_entry(hwid, &pnp.ids, list) { |
1844 | handler = acpi_scan_match_handler(hwid->id, NULL); | |
3338db00 | 1845 | if (handler) { |
2cbb14fb TK |
1846 | acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
1847 | acpi_hotplug_notify_cb, handler); | |
6b772e8f TK |
1848 | break; |
1849 | } | |
1850 | } | |
1851 | ||
7a26b530 | 1852 | out: |
6b772e8f | 1853 | acpi_free_pnp_ids(&pnp); |
a33ec399 RW |
1854 | } |
1855 | ||
e3863094 RW |
1856 | static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, |
1857 | void *not_used, void **return_value) | |
778cbc1d | 1858 | { |
805d410f | 1859 | struct acpi_device *device = NULL; |
778cbc1d BH |
1860 | int type; |
1861 | unsigned long long sta; | |
1862 | int result; | |
1863 | ||
4002bf38 RW |
1864 | acpi_bus_get_device(handle, &device); |
1865 | if (device) | |
1866 | goto out; | |
1867 | ||
778cbc1d BH |
1868 | result = acpi_bus_type_and_status(handle, &type, &sta); |
1869 | if (result) | |
1870 | return AE_OK; | |
1871 | ||
82c7d5ef RW |
1872 | if (type == ACPI_BUS_TYPE_POWER) { |
1873 | acpi_add_power_resource(handle); | |
1874 | return AE_OK; | |
1875 | } | |
1876 | ||
6b772e8f | 1877 | acpi_scan_init_hotplug(handle, type); |
a33ec399 | 1878 | |
2c0d4fe0 | 1879 | acpi_add_single_object(&device, handle, type, sta); |
e3b87f8a | 1880 | if (!device) |
51a85faf | 1881 | return AE_CTRL_DEPTH; |
1da177e4 | 1882 | |
4002bf38 | 1883 | out: |
51a85faf BH |
1884 | if (!*return_value) |
1885 | *return_value = device; | |
805d410f | 1886 | |
51a85faf BH |
1887 | return AE_OK; |
1888 | } | |
3fb02738 | 1889 | |
c5698074 | 1890 | static int acpi_scan_attach_handler(struct acpi_device *device) |
ca589f94 | 1891 | { |
c5698074 RW |
1892 | struct acpi_hardware_id *hwid; |
1893 | int ret = 0; | |
ca589f94 | 1894 | |
c5698074 | 1895 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
87b85b3c | 1896 | const struct acpi_device_id *devid; |
c5698074 | 1897 | struct acpi_scan_handler *handler; |
ca589f94 | 1898 | |
c5698074 RW |
1899 | handler = acpi_scan_match_handler(hwid->id, &devid); |
1900 | if (handler) { | |
87b85b3c RW |
1901 | ret = handler->attach(device, devid); |
1902 | if (ret > 0) { | |
1903 | device->handler = handler; | |
c5698074 | 1904 | break; |
87b85b3c | 1905 | } else if (ret < 0) { |
c5698074 | 1906 | break; |
87b85b3c | 1907 | } |
ca589f94 RW |
1908 | } |
1909 | } | |
1910 | return ret; | |
1911 | } | |
1912 | ||
0fc300b0 RW |
1913 | static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used, |
1914 | void *not_used, void **ret_not_used) | |
51a85faf | 1915 | { |
805d410f | 1916 | struct acpi_device *device; |
202317a5 | 1917 | unsigned long long sta; |
ca589f94 | 1918 | int ret; |
3fb02738 | 1919 | |
805d410f RW |
1920 | /* |
1921 | * Ignore errors ignored by acpi_bus_check_add() to avoid terminating | |
1922 | * namespace walks prematurely. | |
1923 | */ | |
202317a5 | 1924 | if (acpi_bus_type_and_status(handle, &ret, &sta)) |
805d410f | 1925 | return AE_OK; |
1da177e4 | 1926 | |
805d410f RW |
1927 | if (acpi_bus_get_device(handle, &device)) |
1928 | return AE_CTRL_DEPTH; | |
7779688f | 1929 | |
202317a5 RW |
1930 | STRUCT_TO_INT(device->status) = sta; |
1931 | /* Skip devices that are not present. */ | |
1932 | if (!acpi_device_is_present(device)) | |
1933 | goto err; | |
1934 | ||
3a391a39 RW |
1935 | if (device->handler) |
1936 | return AE_OK; | |
1937 | ||
202317a5 RW |
1938 | if (!device->flags.initialized) { |
1939 | acpi_bus_update_power(device, NULL); | |
1940 | device->flags.initialized = true; | |
1941 | } | |
ca589f94 | 1942 | ret = acpi_scan_attach_handler(device); |
6931007c | 1943 | if (ret < 0) |
202317a5 | 1944 | goto err; |
6931007c RW |
1945 | |
1946 | device->flags.match_driver = true; | |
1947 | if (ret > 0) | |
202317a5 | 1948 | goto ok; |
ca589f94 RW |
1949 | |
1950 | ret = device_attach(&device->dev); | |
202317a5 RW |
1951 | if (ret < 0) |
1952 | goto err; | |
1953 | ||
1954 | ok: | |
1955 | device->flags.visited = true; | |
1956 | return AE_OK; | |
1957 | ||
1958 | err: | |
1959 | device->flags.visited = false; | |
1960 | return AE_CTRL_DEPTH; | |
1da177e4 | 1961 | } |
1da177e4 | 1962 | |
636458de | 1963 | /** |
b8bd759a | 1964 | * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. |
636458de | 1965 | * @handle: Root of the namespace scope to scan. |
7779688f | 1966 | * |
636458de RW |
1967 | * Scan a given ACPI tree (probably recently hot-plugged) and create and add |
1968 | * found devices. | |
7779688f | 1969 | * |
636458de RW |
1970 | * If no devices were found, -ENODEV is returned, but it does not mean that |
1971 | * there has been a real error. There just have been no suitable ACPI objects | |
1972 | * in the table trunk from which the kernel could create a device and add an | |
1973 | * appropriate driver. | |
3757b948 RW |
1974 | * |
1975 | * Must be called under acpi_scan_lock. | |
7779688f | 1976 | */ |
b8bd759a | 1977 | int acpi_bus_scan(acpi_handle handle) |
3fb02738 | 1978 | { |
b8bd759a | 1979 | void *device = NULL; |
c511cc19 | 1980 | int error = 0; |
3fb02738 | 1981 | |
b8bd759a RW |
1982 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device))) |
1983 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
1984 | acpi_bus_check_add, NULL, NULL, &device); | |
3fb02738 | 1985 | |
d2f6650a | 1986 | if (!device) |
c511cc19 RW |
1987 | error = -ENODEV; |
1988 | else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL))) | |
b8bd759a RW |
1989 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
1990 | acpi_bus_device_attach, NULL, NULL, NULL); | |
3fb02738 | 1991 | |
c511cc19 | 1992 | return error; |
3fb02738 | 1993 | } |
b8bd759a | 1994 | EXPORT_SYMBOL(acpi_bus_scan); |
a2100801 | 1995 | |
05404d8f RW |
1996 | static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used, |
1997 | void *not_used, void **ret_not_used) | |
1998 | { | |
1999 | struct acpi_device *device = NULL; | |
a2100801 | 2000 | |
05404d8f | 2001 | if (!acpi_bus_get_device(handle, &device)) { |
ca589f94 RW |
2002 | struct acpi_scan_handler *dev_handler = device->handler; |
2003 | ||
ca589f94 RW |
2004 | if (dev_handler) { |
2005 | if (dev_handler->detach) | |
2006 | dev_handler->detach(device); | |
2007 | ||
2008 | device->handler = NULL; | |
2009 | } else { | |
2010 | device_release_driver(&device->dev); | |
2011 | } | |
202317a5 RW |
2012 | /* |
2013 | * Most likely, the device is going away, so put it into D3cold | |
2014 | * before that. | |
2015 | */ | |
2016 | acpi_device_set_power(device, ACPI_STATE_D3_COLD); | |
2017 | device->flags.initialized = false; | |
2018 | device->flags.visited = false; | |
05404d8f RW |
2019 | } |
2020 | return AE_OK; | |
3fb02738 | 2021 | } |
1da177e4 | 2022 | |
3757b948 RW |
2023 | /** |
2024 | * acpi_bus_trim - Remove ACPI device node and all of its descendants | |
2025 | * @start: Root of the ACPI device nodes subtree to remove. | |
2026 | * | |
2027 | * Must be called under acpi_scan_lock. | |
2028 | */ | |
bfee26db | 2029 | void acpi_bus_trim(struct acpi_device *start) |
1da177e4 | 2030 | { |
05404d8f RW |
2031 | /* |
2032 | * Execute acpi_bus_device_detach() as a post-order callback to detach | |
2033 | * all ACPI drivers from the device nodes being removed. | |
2034 | */ | |
2035 | acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL, | |
2036 | acpi_bus_device_detach, NULL, NULL); | |
2037 | acpi_bus_device_detach(start->handle, 0, NULL, NULL); | |
1da177e4 | 2038 | } |
ceaba663 KA |
2039 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
2040 | ||
e8b945c9 | 2041 | static int acpi_bus_scan_fixed(void) |
1da177e4 | 2042 | { |
4be44fcd | 2043 | int result = 0; |
c4168bff | 2044 | |
1da177e4 LT |
2045 | /* |
2046 | * Enumerate all fixed-feature devices. | |
2047 | */ | |
2c0d4fe0 RW |
2048 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { |
2049 | struct acpi_device *device = NULL; | |
2050 | ||
5c478f49 | 2051 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2052 | ACPI_BUS_TYPE_POWER_BUTTON, |
2c0d4fe0 RW |
2053 | ACPI_STA_DEFAULT); |
2054 | if (result) | |
2055 | return result; | |
2056 | ||
88346167 | 2057 | device->flags.match_driver = true; |
2c0d4fe0 RW |
2058 | result = device_attach(&device->dev); |
2059 | if (result < 0) | |
2060 | return result; | |
2061 | ||
c10d7a13 | 2062 | device_init_wakeup(&device->dev, true); |
3fb02738 | 2063 | } |
1da177e4 | 2064 | |
2c0d4fe0 RW |
2065 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { |
2066 | struct acpi_device *device = NULL; | |
2067 | ||
5c478f49 | 2068 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2069 | ACPI_BUS_TYPE_SLEEP_BUTTON, |
2c0d4fe0 RW |
2070 | ACPI_STA_DEFAULT); |
2071 | if (result) | |
2072 | return result; | |
2073 | ||
88346167 | 2074 | device->flags.match_driver = true; |
2c0d4fe0 | 2075 | result = device_attach(&device->dev); |
3fb02738 | 2076 | } |
1da177e4 | 2077 | |
2c0d4fe0 | 2078 | return result < 0 ? result : 0; |
1da177e4 LT |
2079 | } |
2080 | ||
e747f274 | 2081 | int __init acpi_scan_init(void) |
1da177e4 LT |
2082 | { |
2083 | int result; | |
1da177e4 | 2084 | |
5b327265 PM |
2085 | result = bus_register(&acpi_bus_type); |
2086 | if (result) { | |
2087 | /* We don't want to quit even if we failed to add suspend/resume */ | |
2088 | printk(KERN_ERR PREFIX "Could not register bus type\n"); | |
2089 | } | |
2090 | ||
92ef2a25 | 2091 | acpi_pci_root_init(); |
4daeaf68 | 2092 | acpi_pci_link_init(); |
ac212b69 | 2093 | acpi_processor_init(); |
141a297b | 2094 | acpi_platform_init(); |
f58b082a | 2095 | acpi_lpss_init(); |
2fa97feb | 2096 | acpi_cmos_rtc_init(); |
737f1a9f | 2097 | acpi_container_init(); |
0a347644 | 2098 | acpi_memory_hotplug_init(); |
94add0f8 | 2099 | acpi_dock_init(); |
97d9a9e9 | 2100 | |
3757b948 | 2101 | mutex_lock(&acpi_scan_lock); |
1da177e4 LT |
2102 | /* |
2103 | * Enumerate devices in the ACPI namespace. | |
2104 | */ | |
0cd6ac52 RW |
2105 | result = acpi_bus_scan(ACPI_ROOT_OBJECT); |
2106 | if (result) | |
3757b948 | 2107 | goto out; |
1da177e4 | 2108 | |
0cd6ac52 | 2109 | result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); |
1da177e4 | 2110 | if (result) |
3757b948 | 2111 | goto out; |
1da177e4 | 2112 | |
b8bd759a RW |
2113 | result = acpi_bus_scan_fixed(); |
2114 | if (result) { | |
202317a5 RW |
2115 | acpi_detach_data(acpi_root->handle, acpi_scan_drop_device); |
2116 | acpi_device_del(acpi_root); | |
2117 | put_device(&acpi_root->dev); | |
3757b948 | 2118 | goto out; |
b8bd759a | 2119 | } |
1da177e4 | 2120 | |
b8bd759a | 2121 | acpi_update_all_gpes(); |
3757b948 RW |
2122 | |
2123 | out: | |
2124 | mutex_unlock(&acpi_scan_lock); | |
2125 | return result; | |
1da177e4 | 2126 | } |