]>
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 LT |
14 | |
15 | #include <acpi/acpi_drivers.h> | |
1da177e4 | 16 | |
e60cc7a6 BH |
17 | #include "internal.h" |
18 | ||
1da177e4 | 19 | #define _COMPONENT ACPI_BUS_COMPONENT |
f52fd66d | 20 | ACPI_MODULE_NAME("scan"); |
1da177e4 | 21 | #define STRUCT_TO_INT(s) (*((int*)&s)) |
4be44fcd | 22 | extern struct acpi_device *acpi_root; |
1da177e4 LT |
23 | |
24 | #define ACPI_BUS_CLASS "system_bus" | |
29b71a1c | 25 | #define ACPI_BUS_HID "LNXSYBUS" |
1da177e4 LT |
26 | #define ACPI_BUS_DEVICE_NAME "System Bus" |
27 | ||
859ac9a4 BH |
28 | #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent) |
29 | ||
683058e3 RW |
30 | /* |
31 | * If set, devices will be hot-removed even if they cannot be put offline | |
32 | * gracefully (from the kernel's standpoint). | |
33 | */ | |
34 | bool acpi_force_hot_remove; | |
35 | ||
620e112c | 36 | static const char *dummy_hid = "device"; |
2b2ae7c7 | 37 | |
e49bd2dd | 38 | static LIST_HEAD(acpi_bus_id_list); |
c511cc19 | 39 | static DEFINE_MUTEX(acpi_scan_lock); |
ca589f94 | 40 | static LIST_HEAD(acpi_scan_handlers_list); |
9090589d | 41 | DEFINE_MUTEX(acpi_device_lock); |
1da177e4 LT |
42 | LIST_HEAD(acpi_wakeup_device_list); |
43 | ||
e49bd2dd | 44 | struct acpi_device_bus_id{ |
bb095854 | 45 | char bus_id[15]; |
e49bd2dd ZR |
46 | unsigned int instance_no; |
47 | struct list_head node; | |
1da177e4 | 48 | }; |
29b71a1c | 49 | |
3757b948 RW |
50 | void acpi_scan_lock_acquire(void) |
51 | { | |
52 | mutex_lock(&acpi_scan_lock); | |
53 | } | |
54 | EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire); | |
55 | ||
56 | void acpi_scan_lock_release(void) | |
57 | { | |
58 | mutex_unlock(&acpi_scan_lock); | |
59 | } | |
60 | EXPORT_SYMBOL_GPL(acpi_scan_lock_release); | |
61 | ||
ca589f94 RW |
62 | int acpi_scan_add_handler(struct acpi_scan_handler *handler) |
63 | { | |
64 | if (!handler || !handler->attach) | |
65 | return -EINVAL; | |
66 | ||
67 | list_add_tail(&handler->list_node, &acpi_scan_handlers_list); | |
68 | return 0; | |
69 | } | |
70 | ||
3f8055c3 RW |
71 | int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler, |
72 | const char *hotplug_profile_name) | |
73 | { | |
74 | int error; | |
75 | ||
76 | error = acpi_scan_add_handler(handler); | |
77 | if (error) | |
78 | return error; | |
79 | ||
80 | acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name); | |
81 | return 0; | |
82 | } | |
83 | ||
29b71a1c TR |
84 | /* |
85 | * Creates hid/cid(s) string needed for modalias and uevent | |
86 | * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: | |
87 | * char *modalias: "acpi:IBM0001:ACPI0001" | |
88 | */ | |
b3e572d2 AB |
89 | static int create_modalias(struct acpi_device *acpi_dev, char *modalias, |
90 | int size) | |
91 | { | |
29b71a1c | 92 | int len; |
5c9fcb5d | 93 | int count; |
7f47fa6c | 94 | struct acpi_hardware_id *id; |
29b71a1c | 95 | |
2b2ae7c7 TR |
96 | if (list_empty(&acpi_dev->pnp.ids)) |
97 | return 0; | |
98 | ||
5c9fcb5d | 99 | len = snprintf(modalias, size, "acpi:"); |
29b71a1c TR |
100 | size -= len; |
101 | ||
7f47fa6c BH |
102 | list_for_each_entry(id, &acpi_dev->pnp.ids, list) { |
103 | count = snprintf(&modalias[len], size, "%s:", id->id); | |
5c9fcb5d ZR |
104 | if (count < 0 || count >= size) |
105 | return -EINVAL; | |
106 | len += count; | |
107 | size -= count; | |
108 | } | |
109 | ||
29b71a1c TR |
110 | modalias[len] = '\0'; |
111 | return len; | |
112 | } | |
113 | ||
114 | static ssize_t | |
115 | acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
116 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
117 | int len; | |
118 | ||
119 | /* Device has no HID and no CID or string is >1024 */ | |
120 | len = create_modalias(acpi_dev, buf, 1024); | |
121 | if (len <= 0) | |
122 | return 0; | |
123 | buf[len++] = '\n'; | |
124 | return len; | |
125 | } | |
126 | static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); | |
127 | ||
7f28ddec RW |
128 | static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data, |
129 | void **ret_p) | |
683058e3 RW |
130 | { |
131 | struct acpi_device *device = NULL; | |
132 | struct acpi_device_physical_node *pn; | |
303bfdb1 | 133 | bool second_pass = (bool)data; |
683058e3 RW |
134 | acpi_status status = AE_OK; |
135 | ||
136 | if (acpi_bus_get_device(handle, &device)) | |
137 | return AE_OK; | |
138 | ||
7f28ddec RW |
139 | if (device->handler && !device->handler->hotplug.enabled) { |
140 | *ret_p = &device->dev; | |
141 | return AE_SUPPORT; | |
142 | } | |
143 | ||
683058e3 RW |
144 | mutex_lock(&device->physical_node_lock); |
145 | ||
146 | list_for_each_entry(pn, &device->physical_node_list, node) { | |
147 | int ret; | |
148 | ||
303bfdb1 RW |
149 | if (second_pass) { |
150 | /* Skip devices offlined by the first pass. */ | |
151 | if (pn->put_online) | |
152 | continue; | |
153 | } else { | |
154 | pn->put_online = false; | |
155 | } | |
683058e3 RW |
156 | ret = device_offline(pn->dev); |
157 | if (acpi_force_hot_remove) | |
158 | continue; | |
159 | ||
303bfdb1 RW |
160 | if (ret >= 0) { |
161 | pn->put_online = !ret; | |
162 | } else { | |
163 | *ret_p = pn->dev; | |
164 | if (second_pass) { | |
165 | status = AE_ERROR; | |
166 | break; | |
167 | } | |
683058e3 | 168 | } |
683058e3 RW |
169 | } |
170 | ||
171 | mutex_unlock(&device->physical_node_lock); | |
172 | ||
173 | return status; | |
174 | } | |
175 | ||
7f28ddec RW |
176 | static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data, |
177 | void **ret_p) | |
683058e3 RW |
178 | { |
179 | struct acpi_device *device = NULL; | |
180 | struct acpi_device_physical_node *pn; | |
181 | ||
182 | if (acpi_bus_get_device(handle, &device)) | |
183 | return AE_OK; | |
184 | ||
185 | mutex_lock(&device->physical_node_lock); | |
186 | ||
187 | list_for_each_entry(pn, &device->physical_node_list, node) | |
188 | if (pn->put_online) { | |
189 | device_online(pn->dev); | |
190 | pn->put_online = false; | |
191 | } | |
192 | ||
193 | mutex_unlock(&device->physical_node_lock); | |
194 | ||
195 | return AE_OK; | |
196 | } | |
197 | ||
a33ec399 | 198 | static int acpi_scan_hot_remove(struct acpi_device *device) |
1da177e4 | 199 | { |
5993c467 | 200 | acpi_handle handle = device->handle; |
303bfdb1 | 201 | struct device *errdev; |
a33ec399 | 202 | acpi_status status; |
882fd12e | 203 | unsigned long long sta; |
f058cdf4 | 204 | |
3757b948 | 205 | /* If there is no handle, the device node has been unregistered. */ |
a33ec399 | 206 | if (!handle) { |
3757b948 RW |
207 | dev_dbg(&device->dev, "ACPI handle missing\n"); |
208 | put_device(&device->dev); | |
a33ec399 | 209 | return -EINVAL; |
3757b948 RW |
210 | } |
211 | ||
303bfdb1 RW |
212 | /* |
213 | * Carry out two passes here and ignore errors in the first pass, | |
214 | * because if the devices in question are memory blocks and | |
215 | * CONFIG_MEMCG is set, one of the blocks may hold data structures | |
216 | * that the other blocks depend on, but it is not known in advance which | |
217 | * block holds them. | |
218 | * | |
219 | * If the first pass is successful, the second one isn't needed, though. | |
220 | */ | |
221 | errdev = NULL; | |
7f28ddec RW |
222 | status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
223 | NULL, acpi_bus_offline, (void *)false, | |
224 | (void **)&errdev); | |
225 | if (status == AE_SUPPORT) { | |
226 | dev_warn(errdev, "Offline disabled.\n"); | |
227 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
228 | acpi_bus_online, NULL, NULL, NULL); | |
229 | put_device(&device->dev); | |
230 | return -EPERM; | |
231 | } | |
232 | acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev); | |
303bfdb1 RW |
233 | if (errdev) { |
234 | errdev = NULL; | |
683058e3 | 235 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
7f28ddec RW |
236 | NULL, acpi_bus_offline, (void *)true, |
237 | (void **)&errdev); | |
303bfdb1 | 238 | if (!errdev || acpi_force_hot_remove) |
7f28ddec RW |
239 | acpi_bus_offline(handle, 0, (void *)true, |
240 | (void **)&errdev); | |
303bfdb1 RW |
241 | |
242 | if (errdev && !acpi_force_hot_remove) { | |
243 | dev_warn(errdev, "Offline failed.\n"); | |
7f28ddec | 244 | acpi_bus_online(handle, 0, NULL, NULL); |
303bfdb1 | 245 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, |
7f28ddec RW |
246 | ACPI_UINT32_MAX, acpi_bus_online, |
247 | NULL, NULL, NULL); | |
303bfdb1 RW |
248 | put_device(&device->dev); |
249 | return -EBUSY; | |
250 | } | |
683058e3 RW |
251 | } |
252 | ||
26d46867 | 253 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
0794469d | 254 | "Hot-removing device %s...\n", dev_name(&device->dev))); |
26d46867 | 255 | |
bfee26db | 256 | acpi_bus_trim(device); |
683058e3 | 257 | |
3757b948 RW |
258 | /* Device node has been unregistered. */ |
259 | put_device(&device->dev); | |
b3c450c3 TK |
260 | device = NULL; |
261 | ||
7d2421f8 | 262 | acpi_evaluate_lck(handle, 0); |
1da177e4 LT |
263 | /* |
264 | * TBD: _EJD support. | |
265 | */ | |
7d2421f8 JL |
266 | status = acpi_evaluate_ej0(handle); |
267 | if (status == AE_NOT_FOUND) | |
268 | return -ENODEV; | |
269 | else if (ACPI_FAILURE(status)) | |
270 | return -EIO; | |
1da177e4 | 271 | |
882fd12e TK |
272 | /* |
273 | * Verify if eject was indeed successful. If not, log an error | |
274 | * message. No need to call _OST since _EJ0 call was made OK. | |
275 | */ | |
276 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
277 | if (ACPI_FAILURE(status)) { | |
278 | acpi_handle_warn(handle, | |
279 | "Status check after eject failed (0x%x)\n", status); | |
280 | } else if (sta & ACPI_STA_DEVICE_ENABLED) { | |
281 | acpi_handle_warn(handle, | |
282 | "Eject incomplete - status 0x%llx\n", sta); | |
283 | } | |
284 | ||
a33ec399 RW |
285 | return 0; |
286 | } | |
1da177e4 | 287 | |
43d38883 | 288 | void acpi_bus_device_eject(struct acpi_device *device, u32 ost_src) |
a33ec399 | 289 | { |
a3b1b1ef | 290 | acpi_handle handle = device->handle; |
a33ec399 RW |
291 | struct acpi_scan_handler *handler; |
292 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; | |
f943db40 | 293 | int error; |
a33ec399 | 294 | |
e0ae8fee | 295 | lock_device_hotplug(); |
a33ec399 RW |
296 | mutex_lock(&acpi_scan_lock); |
297 | ||
a33ec399 | 298 | handler = device->handler; |
a3b1b1ef RW |
299 | if (!handler || !handler->hotplug.enabled) { |
300 | put_device(&device->dev); | |
7f28ddec | 301 | goto err_support; |
a3b1b1ef RW |
302 | } |
303 | ||
304 | if (ost_src == ACPI_NOTIFY_EJECT_REQUEST) | |
305 | acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, | |
306 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); | |
7f28ddec | 307 | |
f943db40 | 308 | if (handler->hotplug.mode == AHM_CONTAINER) |
a33ec399 | 309 | kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); |
a33ec399 | 310 | |
f943db40 | 311 | error = acpi_scan_hot_remove(device); |
7f28ddec RW |
312 | if (error == -EPERM) { |
313 | goto err_support; | |
314 | } else if (error) { | |
f943db40 | 315 | goto err_out; |
7f28ddec | 316 | } |
1da177e4 | 317 | |
3757b948 | 318 | out: |
f058cdf4 | 319 | mutex_unlock(&acpi_scan_lock); |
e0ae8fee | 320 | unlock_device_hotplug(); |
c8d72a5e | 321 | return; |
a33ec399 | 322 | |
7f28ddec RW |
323 | err_support: |
324 | ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; | |
a33ec399 | 325 | err_out: |
a3b1b1ef | 326 | acpi_evaluate_hotplug_ost(handle, ost_src, ost_code, NULL); |
a33ec399 RW |
327 | goto out; |
328 | } | |
329 | ||
330 | static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source) | |
331 | { | |
332 | struct acpi_device *device = NULL; | |
333 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; | |
334 | int error; | |
335 | ||
683058e3 | 336 | lock_device_hotplug(); |
e0ae8fee | 337 | mutex_lock(&acpi_scan_lock); |
a33ec399 | 338 | |
8832f7e4 RW |
339 | if (ost_source != ACPI_NOTIFY_BUS_CHECK) { |
340 | acpi_bus_get_device(handle, &device); | |
341 | if (device) { | |
342 | dev_warn(&device->dev, "Attempt to re-insert\n"); | |
343 | goto out; | |
344 | } | |
a33ec399 | 345 | } |
a33ec399 RW |
346 | error = acpi_bus_scan(handle); |
347 | if (error) { | |
348 | acpi_handle_warn(handle, "Namespace scan failure\n"); | |
349 | goto out; | |
350 | } | |
351 | error = acpi_bus_get_device(handle, &device); | |
352 | if (error) { | |
353 | acpi_handle_warn(handle, "Missing device node object\n"); | |
354 | goto out; | |
355 | } | |
356 | ost_code = ACPI_OST_SC_SUCCESS; | |
357 | if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER) | |
358 | kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); | |
359 | ||
360 | out: | |
361 | acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL); | |
362 | mutex_unlock(&acpi_scan_lock); | |
e0ae8fee | 363 | unlock_device_hotplug(); |
a33ec399 RW |
364 | } |
365 | ||
366 | static void acpi_scan_bus_check(void *context) | |
367 | { | |
368 | acpi_scan_bus_device_check((acpi_handle)context, | |
369 | ACPI_NOTIFY_BUS_CHECK); | |
370 | } | |
371 | ||
372 | static void acpi_scan_device_check(void *context) | |
373 | { | |
374 | acpi_scan_bus_device_check((acpi_handle)context, | |
375 | ACPI_NOTIFY_DEVICE_CHECK); | |
376 | } | |
377 | ||
2cbb14fb TK |
378 | static void acpi_hotplug_unsupported(acpi_handle handle, u32 type) |
379 | { | |
380 | u32 ost_status; | |
381 | ||
382 | switch (type) { | |
383 | case ACPI_NOTIFY_BUS_CHECK: | |
384 | acpi_handle_debug(handle, | |
385 | "ACPI_NOTIFY_BUS_CHECK event: unsupported\n"); | |
386 | ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED; | |
387 | break; | |
388 | case ACPI_NOTIFY_DEVICE_CHECK: | |
389 | acpi_handle_debug(handle, | |
390 | "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n"); | |
391 | ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED; | |
392 | break; | |
393 | case ACPI_NOTIFY_EJECT_REQUEST: | |
394 | acpi_handle_debug(handle, | |
395 | "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n"); | |
396 | ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED; | |
397 | break; | |
398 | default: | |
399 | /* non-hotplug event; possibly handled by other handler */ | |
400 | return; | |
401 | } | |
402 | ||
403 | acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL); | |
404 | } | |
405 | ||
a3b1b1ef RW |
406 | /** |
407 | * acpi_bus_hot_remove_device: Hot-remove a device and its children. | |
408 | * @context: Address of the ACPI device object to hot-remove. | |
409 | */ | |
43d38883 | 410 | static void acpi_bus_hot_remove_device(void *context) |
a3b1b1ef RW |
411 | { |
412 | acpi_bus_device_eject(context, ACPI_NOTIFY_EJECT_REQUEST); | |
413 | } | |
414 | ||
2cbb14fb | 415 | static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) |
a33ec399 RW |
416 | { |
417 | acpi_osd_exec_callback callback; | |
2cbb14fb | 418 | struct acpi_scan_handler *handler = data; |
a3b1b1ef | 419 | struct acpi_device *adev; |
a33ec399 RW |
420 | acpi_status status; |
421 | ||
2cbb14fb TK |
422 | if (!handler->hotplug.enabled) |
423 | return acpi_hotplug_unsupported(handle, type); | |
424 | ||
a33ec399 RW |
425 | switch (type) { |
426 | case ACPI_NOTIFY_BUS_CHECK: | |
427 | acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); | |
428 | callback = acpi_scan_bus_check; | |
429 | break; | |
430 | case ACPI_NOTIFY_DEVICE_CHECK: | |
431 | acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); | |
432 | callback = acpi_scan_device_check; | |
433 | break; | |
434 | case ACPI_NOTIFY_EJECT_REQUEST: | |
435 | acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); | |
a3b1b1ef RW |
436 | status = acpi_bus_get_device(handle, &adev); |
437 | if (ACPI_FAILURE(status)) | |
438 | goto err_out; | |
439 | ||
440 | get_device(&adev->dev); | |
441 | callback = acpi_bus_hot_remove_device; | |
442 | status = acpi_os_hotplug_execute(callback, adev); | |
443 | if (ACPI_SUCCESS(status)) | |
444 | return; | |
445 | ||
446 | put_device(&adev->dev); | |
447 | goto err_out; | |
a33ec399 RW |
448 | default: |
449 | /* non-hotplug event; possibly handled by other handler */ | |
450 | return; | |
451 | } | |
452 | status = acpi_os_hotplug_execute(callback, handle); | |
a3b1b1ef RW |
453 | if (ACPI_SUCCESS(status)) |
454 | return; | |
5add99cf | 455 | |
a3b1b1ef RW |
456 | err_out: |
457 | acpi_evaluate_hotplug_ost(handle, type, | |
458 | ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); | |
1da177e4 LT |
459 | } |
460 | ||
836aedb1 RW |
461 | static ssize_t real_power_state_show(struct device *dev, |
462 | struct device_attribute *attr, char *buf) | |
463 | { | |
464 | struct acpi_device *adev = to_acpi_device(dev); | |
465 | int state; | |
466 | int ret; | |
467 | ||
468 | ret = acpi_device_get_power(adev, &state); | |
469 | if (ret) | |
470 | return ret; | |
471 | ||
472 | return sprintf(buf, "%s\n", acpi_power_state_string(state)); | |
473 | } | |
474 | ||
475 | static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL); | |
476 | ||
477 | static ssize_t power_state_show(struct device *dev, | |
478 | struct device_attribute *attr, char *buf) | |
479 | { | |
480 | struct acpi_device *adev = to_acpi_device(dev); | |
481 | ||
482 | return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state)); | |
483 | } | |
484 | ||
485 | static DEVICE_ATTR(power_state, 0444, power_state_show, NULL); | |
486 | ||
5add99cf RW |
487 | static void acpi_eject_store_work(void *context) |
488 | { | |
a3b1b1ef | 489 | acpi_bus_device_eject(context, ACPI_OST_EC_OSPM_EJECT); |
5add99cf RW |
490 | } |
491 | ||
1da177e4 | 492 | static ssize_t |
f883d9db PM |
493 | acpi_eject_store(struct device *d, struct device_attribute *attr, |
494 | const char *buf, size_t count) | |
1da177e4 | 495 | { |
f883d9db | 496 | struct acpi_device *acpi_device = to_acpi_device(d); |
a33ec399 RW |
497 | acpi_object_type not_used; |
498 | acpi_status status; | |
1da177e4 | 499 | |
a33ec399 | 500 | if (!count || buf[0] != '1') |
1da177e4 | 501 | return -EINVAL; |
1da177e4 | 502 | |
a33ec399 RW |
503 | if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled) |
504 | && !acpi_device->driver) | |
505 | return -ENODEV; | |
506 | ||
507 | status = acpi_get_type(acpi_device->handle, ¬_used); | |
508 | if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable) | |
509 | return -ENODEV; | |
510 | ||
f943db40 | 511 | acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, |
a33ec399 | 512 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); |
a33ec399 | 513 | get_device(&acpi_device->dev); |
5add99cf | 514 | status = acpi_os_hotplug_execute(acpi_eject_store_work, acpi_device); |
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 | ||
e49bd2dd | 605 | static int acpi_device_setup_files(struct acpi_device *dev) |
1da177e4 | 606 | { |
d1efe3c3 | 607 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
f883d9db | 608 | acpi_status status; |
bb74ac23 | 609 | unsigned long long sun; |
e49bd2dd | 610 | int result = 0; |
1da177e4 LT |
611 | |
612 | /* | |
e49bd2dd | 613 | * Devices gotten from FADT don't have a "path" attribute |
1da177e4 | 614 | */ |
0c526d96 | 615 | if (dev->handle) { |
e49bd2dd | 616 | result = device_create_file(&dev->dev, &dev_attr_path); |
0c526d96 | 617 | if (result) |
e49bd2dd | 618 | goto end; |
1da177e4 LT |
619 | } |
620 | ||
2b2ae7c7 TR |
621 | if (!list_empty(&dev->pnp.ids)) { |
622 | result = device_create_file(&dev->dev, &dev_attr_hid); | |
623 | if (result) | |
624 | goto end; | |
1da177e4 | 625 | |
2b2ae7c7 TR |
626 | result = device_create_file(&dev->dev, &dev_attr_modalias); |
627 | if (result) | |
628 | goto end; | |
629 | } | |
29b71a1c | 630 | |
d1efe3c3 LO |
631 | /* |
632 | * If device has _STR, 'description' file is created | |
633 | */ | |
952c63e9 | 634 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
635 | status = acpi_evaluate_object(dev->handle, "_STR", |
636 | NULL, &buffer); | |
637 | if (ACPI_FAILURE(status)) | |
638 | buffer.pointer = NULL; | |
639 | dev->pnp.str_obj = buffer.pointer; | |
640 | result = device_create_file(&dev->dev, &dev_attr_description); | |
641 | if (result) | |
642 | goto end; | |
643 | } | |
644 | ||
d4e1a692 | 645 | if (dev->pnp.type.bus_address) |
923d4a45 LZ |
646 | result = device_create_file(&dev->dev, &dev_attr_adr); |
647 | if (dev->pnp.unique_id) | |
648 | result = device_create_file(&dev->dev, &dev_attr_uid); | |
649 | ||
bb74ac23 YI |
650 | status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun); |
651 | if (ACPI_SUCCESS(status)) { | |
652 | dev->pnp.sun = (unsigned long)sun; | |
653 | result = device_create_file(&dev->dev, &dev_attr_sun); | |
654 | if (result) | |
655 | goto end; | |
656 | } else { | |
657 | dev->pnp.sun = (unsigned long)-1; | |
658 | } | |
659 | ||
e49bd2dd ZR |
660 | /* |
661 | * If device has _EJ0, 'eject' file is created that is used to trigger | |
662 | * hot-removal function from userland. | |
663 | */ | |
952c63e9 | 664 | if (acpi_has_method(dev->handle, "_EJ0")) { |
e49bd2dd | 665 | result = device_create_file(&dev->dev, &dev_attr_eject); |
836aedb1 RW |
666 | if (result) |
667 | return result; | |
668 | } | |
669 | ||
670 | if (dev->flags.power_manageable) { | |
671 | result = device_create_file(&dev->dev, &dev_attr_power_state); | |
672 | if (result) | |
673 | return result; | |
674 | ||
675 | if (dev->power.flags.power_resources) | |
676 | result = device_create_file(&dev->dev, | |
677 | &dev_attr_real_power_state); | |
678 | } | |
679 | ||
0c526d96 | 680 | end: |
e49bd2dd | 681 | return result; |
1da177e4 LT |
682 | } |
683 | ||
f883d9db | 684 | static void acpi_device_remove_files(struct acpi_device *dev) |
1da177e4 | 685 | { |
836aedb1 RW |
686 | if (dev->flags.power_manageable) { |
687 | device_remove_file(&dev->dev, &dev_attr_power_state); | |
688 | if (dev->power.flags.power_resources) | |
689 | device_remove_file(&dev->dev, | |
690 | &dev_attr_real_power_state); | |
691 | } | |
692 | ||
f883d9db | 693 | /* |
d1efe3c3 LO |
694 | * If device has _STR, remove 'description' file |
695 | */ | |
952c63e9 | 696 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
697 | kfree(dev->pnp.str_obj); |
698 | device_remove_file(&dev->dev, &dev_attr_description); | |
699 | } | |
700 | /* | |
701 | * If device has _EJ0, remove 'eject' file. | |
f883d9db | 702 | */ |
952c63e9 | 703 | if (acpi_has_method(dev->handle, "_EJ0")) |
f883d9db | 704 | device_remove_file(&dev->dev, &dev_attr_eject); |
1da177e4 | 705 | |
952c63e9 | 706 | if (acpi_has_method(dev->handle, "_SUN")) |
bb74ac23 YI |
707 | device_remove_file(&dev->dev, &dev_attr_sun); |
708 | ||
923d4a45 LZ |
709 | if (dev->pnp.unique_id) |
710 | device_remove_file(&dev->dev, &dev_attr_uid); | |
d4e1a692 | 711 | if (dev->pnp.type.bus_address) |
923d4a45 | 712 | device_remove_file(&dev->dev, &dev_attr_adr); |
1131b938 BH |
713 | device_remove_file(&dev->dev, &dev_attr_modalias); |
714 | device_remove_file(&dev->dev, &dev_attr_hid); | |
0c526d96 | 715 | if (dev->handle) |
e49bd2dd | 716 | device_remove_file(&dev->dev, &dev_attr_path); |
1da177e4 | 717 | } |
1da177e4 | 718 | /* -------------------------------------------------------------------------- |
9e89dde2 | 719 | ACPI Bus operations |
1da177e4 | 720 | -------------------------------------------------------------------------- */ |
29b71a1c | 721 | |
cf761af9 MW |
722 | static const struct acpi_device_id *__acpi_match_device( |
723 | struct acpi_device *device, const struct acpi_device_id *ids) | |
29b71a1c TR |
724 | { |
725 | const struct acpi_device_id *id; | |
7f47fa6c | 726 | struct acpi_hardware_id *hwid; |
29b71a1c | 727 | |
39a0ad87 ZY |
728 | /* |
729 | * If the device is not present, it is unnecessary to load device | |
730 | * driver for it. | |
731 | */ | |
732 | if (!device->status.present) | |
cf761af9 | 733 | return NULL; |
39a0ad87 | 734 | |
7f47fa6c BH |
735 | for (id = ids; id->id[0]; id++) |
736 | list_for_each_entry(hwid, &device->pnp.ids, list) | |
737 | if (!strcmp((char *) id->id, hwid->id)) | |
cf761af9 MW |
738 | return id; |
739 | ||
740 | return NULL; | |
741 | } | |
742 | ||
743 | /** | |
744 | * acpi_match_device - Match a struct device against a given list of ACPI IDs | |
745 | * @ids: Array of struct acpi_device_id object to match against. | |
746 | * @dev: The device structure to match. | |
747 | * | |
748 | * Check if @dev has a valid ACPI handle and if there is a struct acpi_device | |
749 | * object for that handle and use that object to match against a given list of | |
750 | * device IDs. | |
751 | * | |
752 | * Return a pointer to the first matching ID on success or %NULL on failure. | |
753 | */ | |
754 | const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, | |
755 | const struct device *dev) | |
756 | { | |
757 | struct acpi_device *adev; | |
0613e1f7 | 758 | acpi_handle handle = ACPI_HANDLE(dev); |
cf761af9 | 759 | |
0613e1f7 | 760 | if (!ids || !handle || acpi_bus_get_device(handle, &adev)) |
cf761af9 MW |
761 | return NULL; |
762 | ||
763 | return __acpi_match_device(adev, ids); | |
764 | } | |
765 | EXPORT_SYMBOL_GPL(acpi_match_device); | |
29b71a1c | 766 | |
cf761af9 MW |
767 | int acpi_match_device_ids(struct acpi_device *device, |
768 | const struct acpi_device_id *ids) | |
769 | { | |
770 | return __acpi_match_device(device, ids) ? 0 : -ENOENT; | |
29b71a1c TR |
771 | } |
772 | EXPORT_SYMBOL(acpi_match_device_ids); | |
773 | ||
0b224527 RW |
774 | static void acpi_free_power_resources_lists(struct acpi_device *device) |
775 | { | |
776 | int i; | |
777 | ||
993cbe59 RW |
778 | if (device->wakeup.flags.valid) |
779 | acpi_power_resources_list_free(&device->wakeup.resources); | |
780 | ||
0b224527 RW |
781 | if (!device->flags.power_manageable) |
782 | return; | |
783 | ||
784 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { | |
785 | struct acpi_device_power_state *ps = &device->power.states[i]; | |
786 | acpi_power_resources_list_free(&ps->resources); | |
787 | } | |
7f47fa6c BH |
788 | } |
789 | ||
1890a97a | 790 | static void acpi_device_release(struct device *dev) |
1da177e4 | 791 | { |
1890a97a | 792 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1da177e4 | 793 | |
c0af4175 | 794 | acpi_free_pnp_ids(&acpi_dev->pnp); |
0b224527 | 795 | acpi_free_power_resources_lists(acpi_dev); |
1890a97a | 796 | kfree(acpi_dev); |
1da177e4 LT |
797 | } |
798 | ||
5d9464a4 | 799 | static int acpi_bus_match(struct device *dev, struct device_driver *drv) |
9e89dde2 | 800 | { |
5d9464a4 PM |
801 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
802 | struct acpi_driver *acpi_drv = to_acpi_driver(drv); | |
1da177e4 | 803 | |
209d3b17 | 804 | return acpi_dev->flags.match_driver |
805d410f | 805 | && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); |
5d9464a4 | 806 | } |
1da177e4 | 807 | |
7eff2e7a | 808 | static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 | 809 | { |
5d9464a4 | 810 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
7eff2e7a | 811 | int len; |
5d9464a4 | 812 | |
2b2ae7c7 TR |
813 | if (list_empty(&acpi_dev->pnp.ids)) |
814 | return 0; | |
815 | ||
7eff2e7a KS |
816 | if (add_uevent_var(env, "MODALIAS=")) |
817 | return -ENOMEM; | |
818 | len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], | |
819 | sizeof(env->buf) - env->buflen); | |
820 | if (len >= (sizeof(env->buf) - env->buflen)) | |
821 | return -ENOMEM; | |
822 | env->buflen += len; | |
9e89dde2 | 823 | return 0; |
1da177e4 LT |
824 | } |
825 | ||
46ec8598 BH |
826 | static void acpi_device_notify(acpi_handle handle, u32 event, void *data) |
827 | { | |
828 | struct acpi_device *device = data; | |
829 | ||
830 | device->driver->ops.notify(device, event); | |
831 | } | |
832 | ||
833 | static acpi_status acpi_device_notify_fixed(void *data) | |
834 | { | |
835 | struct acpi_device *device = data; | |
836 | ||
53de5356 BH |
837 | /* Fixed hardware devices have no handles */ |
838 | acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); | |
46ec8598 BH |
839 | return AE_OK; |
840 | } | |
841 | ||
842 | static int acpi_device_install_notify_handler(struct acpi_device *device) | |
843 | { | |
844 | acpi_status status; | |
46ec8598 | 845 | |
ccba2a36 | 846 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 BH |
847 | status = |
848 | acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, | |
849 | acpi_device_notify_fixed, | |
850 | device); | |
ccba2a36 | 851 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 BH |
852 | status = |
853 | acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, | |
854 | acpi_device_notify_fixed, | |
855 | device); | |
856 | else | |
857 | status = acpi_install_notify_handler(device->handle, | |
858 | ACPI_DEVICE_NOTIFY, | |
859 | acpi_device_notify, | |
860 | device); | |
861 | ||
862 | if (ACPI_FAILURE(status)) | |
863 | return -EINVAL; | |
864 | return 0; | |
865 | } | |
866 | ||
867 | static void acpi_device_remove_notify_handler(struct acpi_device *device) | |
868 | { | |
ccba2a36 | 869 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 BH |
870 | acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
871 | acpi_device_notify_fixed); | |
ccba2a36 | 872 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 BH |
873 | acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, |
874 | acpi_device_notify_fixed); | |
875 | else | |
876 | acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, | |
877 | acpi_device_notify); | |
878 | } | |
879 | ||
d9e455f5 | 880 | static int acpi_device_probe(struct device *dev) |
1da177e4 | 881 | { |
5d9464a4 PM |
882 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
883 | struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); | |
884 | int ret; | |
885 | ||
24071f47 RW |
886 | if (acpi_dev->handler) |
887 | return -EINVAL; | |
888 | ||
d9e455f5 RW |
889 | if (!acpi_drv->ops.add) |
890 | return -ENOSYS; | |
46ec8598 | 891 | |
d9e455f5 RW |
892 | ret = acpi_drv->ops.add(acpi_dev); |
893 | if (ret) | |
894 | return ret; | |
46ec8598 | 895 | |
d9e455f5 RW |
896 | acpi_dev->driver = acpi_drv; |
897 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
898 | "Driver [%s] successfully bound to device [%s]\n", | |
899 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
900 | ||
901 | if (acpi_drv->ops.notify) { | |
902 | ret = acpi_device_install_notify_handler(acpi_dev); | |
903 | if (ret) { | |
904 | if (acpi_drv->ops.remove) | |
905 | acpi_drv->ops.remove(acpi_dev); | |
906 | ||
907 | acpi_dev->driver = NULL; | |
908 | acpi_dev->driver_data = NULL; | |
909 | return ret; | |
910 | } | |
5d9464a4 | 911 | } |
d9e455f5 RW |
912 | |
913 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", | |
914 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
915 | get_device(dev); | |
916 | return 0; | |
5d9464a4 | 917 | } |
1da177e4 | 918 | |
5d9464a4 PM |
919 | static int acpi_device_remove(struct device * dev) |
920 | { | |
921 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
922 | struct acpi_driver *acpi_drv = acpi_dev->driver; | |
923 | ||
924 | if (acpi_drv) { | |
46ec8598 BH |
925 | if (acpi_drv->ops.notify) |
926 | acpi_device_remove_notify_handler(acpi_dev); | |
5d9464a4 | 927 | if (acpi_drv->ops.remove) |
51fac838 | 928 | acpi_drv->ops.remove(acpi_dev); |
1da177e4 | 929 | } |
5d9464a4 | 930 | acpi_dev->driver = NULL; |
db89b4f0 | 931 | acpi_dev->driver_data = NULL; |
1da177e4 | 932 | |
5d9464a4 | 933 | put_device(dev); |
9e89dde2 ZR |
934 | return 0; |
935 | } | |
1da177e4 | 936 | |
55955aad | 937 | struct bus_type acpi_bus_type = { |
9e89dde2 | 938 | .name = "acpi", |
5d9464a4 PM |
939 | .match = acpi_bus_match, |
940 | .probe = acpi_device_probe, | |
941 | .remove = acpi_device_remove, | |
942 | .uevent = acpi_device_uevent, | |
9e89dde2 ZR |
943 | }; |
944 | ||
caf5c03f RW |
945 | static void acpi_bus_data_handler(acpi_handle handle, void *context) |
946 | { | |
947 | /* Intentionally empty. */ | |
948 | } | |
949 | ||
950 | int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) | |
951 | { | |
952 | acpi_status status; | |
953 | ||
954 | if (!device) | |
955 | return -EINVAL; | |
956 | ||
957 | status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device); | |
958 | if (ACPI_FAILURE(status) || !*device) { | |
959 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", | |
960 | handle)); | |
961 | return -ENODEV; | |
962 | } | |
963 | return 0; | |
964 | } | |
965 | EXPORT_SYMBOL_GPL(acpi_bus_get_device); | |
966 | ||
cf860be6 RW |
967 | int acpi_device_add(struct acpi_device *device, |
968 | void (*release)(struct device *)) | |
1da177e4 | 969 | { |
4be44fcd | 970 | int result; |
e49bd2dd ZR |
971 | struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; |
972 | int found = 0; | |
66b7ed40 | 973 | |
d43e167d RW |
974 | if (device->handle) { |
975 | acpi_status status; | |
976 | ||
977 | status = acpi_attach_data(device->handle, acpi_bus_data_handler, | |
978 | device); | |
979 | if (ACPI_FAILURE(status)) { | |
980 | acpi_handle_err(device->handle, | |
981 | "Unable to attach device data\n"); | |
982 | return -ENODEV; | |
983 | } | |
984 | } | |
985 | ||
9e89dde2 ZR |
986 | /* |
987 | * Linkage | |
988 | * ------- | |
989 | * Link this device to its parent and siblings. | |
990 | */ | |
991 | INIT_LIST_HEAD(&device->children); | |
992 | INIT_LIST_HEAD(&device->node); | |
9e89dde2 | 993 | INIT_LIST_HEAD(&device->wakeup_list); |
1033f904 LT |
994 | INIT_LIST_HEAD(&device->physical_node_list); |
995 | mutex_init(&device->physical_node_lock); | |
bc9b6407 | 996 | INIT_LIST_HEAD(&device->power_dependent); |
1da177e4 | 997 | |
e49bd2dd ZR |
998 | new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); |
999 | if (!new_bus_id) { | |
d43e167d RW |
1000 | pr_err(PREFIX "Memory allocation error\n"); |
1001 | result = -ENOMEM; | |
1002 | goto err_detach; | |
1da177e4 | 1003 | } |
e49bd2dd | 1004 | |
9090589d | 1005 | mutex_lock(&acpi_device_lock); |
e49bd2dd ZR |
1006 | /* |
1007 | * Find suitable bus_id and instance number in acpi_bus_id_list | |
1008 | * If failed, create one and link it into acpi_bus_id_list | |
1009 | */ | |
1010 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { | |
1131b938 BH |
1011 | if (!strcmp(acpi_device_bus_id->bus_id, |
1012 | acpi_device_hid(device))) { | |
1013 | acpi_device_bus_id->instance_no++; | |
e49bd2dd ZR |
1014 | found = 1; |
1015 | kfree(new_bus_id); | |
1016 | break; | |
1017 | } | |
1da177e4 | 1018 | } |
0c526d96 | 1019 | if (!found) { |
e49bd2dd | 1020 | acpi_device_bus_id = new_bus_id; |
1131b938 | 1021 | strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); |
e49bd2dd ZR |
1022 | acpi_device_bus_id->instance_no = 0; |
1023 | list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); | |
1da177e4 | 1024 | } |
0794469d | 1025 | dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); |
1da177e4 | 1026 | |
33b57150 | 1027 | if (device->parent) |
9e89dde2 | 1028 | list_add_tail(&device->node, &device->parent->children); |
33b57150 | 1029 | |
9e89dde2 ZR |
1030 | if (device->wakeup.flags.valid) |
1031 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); | |
9090589d | 1032 | mutex_unlock(&acpi_device_lock); |
1da177e4 | 1033 | |
1890a97a | 1034 | if (device->parent) |
66b7ed40 | 1035 | device->dev.parent = &device->parent->dev; |
1890a97a | 1036 | device->dev.bus = &acpi_bus_type; |
82c7d5ef | 1037 | device->dev.release = release; |
cf860be6 | 1038 | result = device_add(&device->dev); |
0c526d96 | 1039 | if (result) { |
8b12b922 | 1040 | dev_err(&device->dev, "Error registering device\n"); |
d43e167d | 1041 | goto err; |
1da177e4 | 1042 | } |
1da177e4 | 1043 | |
e49bd2dd | 1044 | result = acpi_device_setup_files(device); |
0c526d96 | 1045 | if (result) |
0794469d KS |
1046 | printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", |
1047 | dev_name(&device->dev)); | |
1da177e4 | 1048 | |
1da177e4 | 1049 | return 0; |
d43e167d RW |
1050 | |
1051 | err: | |
9090589d | 1052 | mutex_lock(&acpi_device_lock); |
33b57150 | 1053 | if (device->parent) |
e49bd2dd | 1054 | list_del(&device->node); |
e49bd2dd | 1055 | list_del(&device->wakeup_list); |
9090589d | 1056 | mutex_unlock(&acpi_device_lock); |
d43e167d RW |
1057 | |
1058 | err_detach: | |
1059 | acpi_detach_data(device->handle, acpi_bus_data_handler); | |
e49bd2dd | 1060 | return result; |
1da177e4 LT |
1061 | } |
1062 | ||
b17b537a | 1063 | static void acpi_device_unregister(struct acpi_device *device) |
9e89dde2 | 1064 | { |
9090589d | 1065 | mutex_lock(&acpi_device_lock); |
33b57150 | 1066 | if (device->parent) |
9e89dde2 | 1067 | list_del(&device->node); |
1da177e4 | 1068 | |
9e89dde2 | 1069 | list_del(&device->wakeup_list); |
9090589d | 1070 | mutex_unlock(&acpi_device_lock); |
1da177e4 | 1071 | |
9e89dde2 | 1072 | acpi_detach_data(device->handle, acpi_bus_data_handler); |
1890a97a | 1073 | |
bc9b6407 | 1074 | acpi_power_add_remove_device(device, false); |
f883d9db | 1075 | acpi_device_remove_files(device); |
b1c0f99b RW |
1076 | if (device->remove) |
1077 | device->remove(device); | |
1078 | ||
cf860be6 | 1079 | device_del(&device->dev); |
bc9b6407 | 1080 | /* |
0aa120a0 RW |
1081 | * Transition the device to D3cold to drop the reference counts of all |
1082 | * power resources the device depends on and turn off the ones that have | |
1083 | * no more references. | |
bc9b6407 | 1084 | */ |
0aa120a0 | 1085 | acpi_device_set_power(device, ACPI_STATE_D3_COLD); |
3757b948 | 1086 | device->handle = NULL; |
cf860be6 | 1087 | put_device(&device->dev); |
1da177e4 LT |
1088 | } |
1089 | ||
9e89dde2 ZR |
1090 | /* -------------------------------------------------------------------------- |
1091 | Driver Management | |
1092 | -------------------------------------------------------------------------- */ | |
9e89dde2 ZR |
1093 | /** |
1094 | * acpi_bus_register_driver - register a driver with the ACPI bus | |
1095 | * @driver: driver being registered | |
1096 | * | |
1097 | * Registers a driver with the ACPI bus. Searches the namespace for all | |
1098 | * devices that match the driver's criteria and binds. Returns zero for | |
1099 | * success or a negative error status for failure. | |
1100 | */ | |
1101 | int acpi_bus_register_driver(struct acpi_driver *driver) | |
1da177e4 | 1102 | { |
1890a97a | 1103 | int ret; |
1da177e4 | 1104 | |
9e89dde2 ZR |
1105 | if (acpi_disabled) |
1106 | return -ENODEV; | |
1890a97a PM |
1107 | driver->drv.name = driver->name; |
1108 | driver->drv.bus = &acpi_bus_type; | |
1109 | driver->drv.owner = driver->owner; | |
1da177e4 | 1110 | |
1890a97a PM |
1111 | ret = driver_register(&driver->drv); |
1112 | return ret; | |
9e89dde2 | 1113 | } |
1da177e4 | 1114 | |
9e89dde2 ZR |
1115 | EXPORT_SYMBOL(acpi_bus_register_driver); |
1116 | ||
1117 | /** | |
1118 | * acpi_bus_unregister_driver - unregisters a driver with the APIC bus | |
1119 | * @driver: driver to unregister | |
1120 | * | |
1121 | * Unregisters a driver with the ACPI bus. Searches the namespace for all | |
1122 | * devices that match the driver's criteria and unbinds. | |
1123 | */ | |
1124 | void acpi_bus_unregister_driver(struct acpi_driver *driver) | |
1125 | { | |
1890a97a | 1126 | driver_unregister(&driver->drv); |
9e89dde2 ZR |
1127 | } |
1128 | ||
1129 | EXPORT_SYMBOL(acpi_bus_unregister_driver); | |
1130 | ||
9e89dde2 ZR |
1131 | /* -------------------------------------------------------------------------- |
1132 | Device Enumeration | |
1133 | -------------------------------------------------------------------------- */ | |
5c478f49 BH |
1134 | static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) |
1135 | { | |
456de893 | 1136 | struct acpi_device *device = NULL; |
5c478f49 | 1137 | acpi_status status; |
5c478f49 BH |
1138 | |
1139 | /* | |
1140 | * Fixed hardware devices do not appear in the namespace and do not | |
1141 | * have handles, but we fabricate acpi_devices for them, so we have | |
1142 | * to deal with them specially. | |
1143 | */ | |
456de893 | 1144 | if (!handle) |
5c478f49 BH |
1145 | return acpi_root; |
1146 | ||
1147 | do { | |
1148 | status = acpi_get_parent(handle, &handle); | |
5c478f49 | 1149 | if (ACPI_FAILURE(status)) |
456de893 RW |
1150 | return status == AE_NULL_ENTRY ? NULL : acpi_root; |
1151 | } while (acpi_bus_get_device(handle, &device)); | |
1152 | return device; | |
5c478f49 BH |
1153 | } |
1154 | ||
9e89dde2 ZR |
1155 | acpi_status |
1156 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) | |
1157 | { | |
1158 | acpi_status status; | |
1159 | acpi_handle tmp; | |
1160 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
1161 | union acpi_object *obj; | |
1162 | ||
1163 | status = acpi_get_handle(handle, "_EJD", &tmp); | |
1164 | if (ACPI_FAILURE(status)) | |
1165 | return status; | |
1166 | ||
1167 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); | |
1168 | if (ACPI_SUCCESS(status)) { | |
1169 | obj = buffer.pointer; | |
3b5fee59 HM |
1170 | status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, |
1171 | ejd); | |
9e89dde2 ZR |
1172 | kfree(buffer.pointer); |
1173 | } | |
1174 | return status; | |
1175 | } | |
1176 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); | |
1177 | ||
e88c9c60 RW |
1178 | static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle, |
1179 | struct acpi_device_wakeup *wakeup) | |
9e89dde2 | 1180 | { |
b581a7f9 RW |
1181 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1182 | union acpi_object *package = NULL; | |
9e89dde2 | 1183 | union acpi_object *element = NULL; |
b581a7f9 | 1184 | acpi_status status; |
e88c9c60 | 1185 | int err = -ENODATA; |
9e89dde2 | 1186 | |
b581a7f9 | 1187 | if (!wakeup) |
e88c9c60 | 1188 | return -EINVAL; |
9e89dde2 | 1189 | |
993cbe59 | 1190 | INIT_LIST_HEAD(&wakeup->resources); |
9e89dde2 | 1191 | |
b581a7f9 RW |
1192 | /* _PRW */ |
1193 | status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); | |
1194 | if (ACPI_FAILURE(status)) { | |
1195 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); | |
e88c9c60 | 1196 | return err; |
b581a7f9 RW |
1197 | } |
1198 | ||
1199 | package = (union acpi_object *)buffer.pointer; | |
1200 | ||
e88c9c60 | 1201 | if (!package || package->package.count < 2) |
b581a7f9 | 1202 | goto out; |
b581a7f9 | 1203 | |
9e89dde2 | 1204 | element = &(package->package.elements[0]); |
e88c9c60 | 1205 | if (!element) |
b581a7f9 | 1206 | goto out; |
e88c9c60 | 1207 | |
9e89dde2 ZR |
1208 | if (element->type == ACPI_TYPE_PACKAGE) { |
1209 | if ((element->package.count < 2) || | |
1210 | (element->package.elements[0].type != | |
1211 | ACPI_TYPE_LOCAL_REFERENCE) | |
e88c9c60 | 1212 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
b581a7f9 | 1213 | goto out; |
e88c9c60 | 1214 | |
b581a7f9 | 1215 | wakeup->gpe_device = |
9e89dde2 | 1216 | element->package.elements[0].reference.handle; |
b581a7f9 | 1217 | wakeup->gpe_number = |
9e89dde2 ZR |
1218 | (u32) element->package.elements[1].integer.value; |
1219 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
b581a7f9 RW |
1220 | wakeup->gpe_device = NULL; |
1221 | wakeup->gpe_number = element->integer.value; | |
1222 | } else { | |
b581a7f9 RW |
1223 | goto out; |
1224 | } | |
9e89dde2 ZR |
1225 | |
1226 | element = &(package->package.elements[1]); | |
e88c9c60 | 1227 | if (element->type != ACPI_TYPE_INTEGER) |
b581a7f9 | 1228 | goto out; |
e88c9c60 | 1229 | |
b581a7f9 | 1230 | wakeup->sleep_state = element->integer.value; |
9e89dde2 | 1231 | |
e88c9c60 RW |
1232 | err = acpi_extract_power_resources(package, 2, &wakeup->resources); |
1233 | if (err) | |
b581a7f9 | 1234 | goto out; |
9e89dde2 | 1235 | |
0596a52b RW |
1236 | if (!list_empty(&wakeup->resources)) { |
1237 | int sleep_state; | |
9e89dde2 | 1238 | |
b5d667eb RW |
1239 | err = acpi_power_wakeup_list_init(&wakeup->resources, |
1240 | &sleep_state); | |
1241 | if (err) { | |
1242 | acpi_handle_warn(handle, "Retrieving current states " | |
1243 | "of wakeup power resources failed\n"); | |
1244 | acpi_power_resources_list_free(&wakeup->resources); | |
1245 | goto out; | |
1246 | } | |
0596a52b RW |
1247 | if (sleep_state < wakeup->sleep_state) { |
1248 | acpi_handle_warn(handle, "Overriding _PRW sleep state " | |
1249 | "(S%d) by S%d from power resources\n", | |
1250 | (int)wakeup->sleep_state, sleep_state); | |
1251 | wakeup->sleep_state = sleep_state; | |
1252 | } | |
1253 | } | |
bba63a29 | 1254 | acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number); |
9874647b | 1255 | |
b581a7f9 RW |
1256 | out: |
1257 | kfree(buffer.pointer); | |
e88c9c60 | 1258 | return err; |
1da177e4 LT |
1259 | } |
1260 | ||
f517709d | 1261 | static void acpi_bus_set_run_wake_flags(struct acpi_device *device) |
1da177e4 | 1262 | { |
29b71a1c | 1263 | struct acpi_device_id button_device_ids[] = { |
29b71a1c | 1264 | {"PNP0C0C", 0}, |
b7e38304 | 1265 | {"PNP0C0D", 0}, |
29b71a1c TR |
1266 | {"PNP0C0E", 0}, |
1267 | {"", 0}, | |
1268 | }; | |
f517709d RW |
1269 | acpi_status status; |
1270 | acpi_event_status event_status; | |
1271 | ||
b67ea761 | 1272 | device->wakeup.flags.notifier_present = 0; |
f517709d RW |
1273 | |
1274 | /* Power button, Lid switch always enable wakeup */ | |
1275 | if (!acpi_match_device_ids(device, button_device_ids)) { | |
1276 | device->wakeup.flags.run_wake = 1; | |
b7e38304 ZR |
1277 | if (!acpi_match_device_ids(device, &button_device_ids[1])) { |
1278 | /* Do not use Lid/sleep button for S5 wakeup */ | |
1279 | if (device->wakeup.sleep_state == ACPI_STATE_S5) | |
1280 | device->wakeup.sleep_state = ACPI_STATE_S4; | |
1281 | } | |
f2b56bc8 | 1282 | device_set_wakeup_capable(&device->dev, true); |
f517709d RW |
1283 | return; |
1284 | } | |
1285 | ||
e8e18c95 RW |
1286 | status = acpi_get_gpe_status(device->wakeup.gpe_device, |
1287 | device->wakeup.gpe_number, | |
1288 | &event_status); | |
f517709d RW |
1289 | if (status == AE_OK) |
1290 | device->wakeup.flags.run_wake = | |
1291 | !!(event_status & ACPI_EVENT_FLAG_HANDLE); | |
1292 | } | |
1293 | ||
d57d09a4 | 1294 | static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
f517709d | 1295 | { |
e88c9c60 | 1296 | int err; |
29b71a1c | 1297 | |
d57d09a4 | 1298 | /* Presence of _PRW indicates wake capable */ |
952c63e9 | 1299 | if (!acpi_has_method(device->handle, "_PRW")) |
d57d09a4 RW |
1300 | return; |
1301 | ||
e88c9c60 RW |
1302 | err = acpi_bus_extract_wakeup_device_power_package(device->handle, |
1303 | &device->wakeup); | |
1304 | if (err) { | |
1305 | dev_err(&device->dev, "_PRW evaluation error: %d\n", err); | |
d57d09a4 | 1306 | return; |
9e89dde2 | 1307 | } |
1da177e4 | 1308 | |
9e89dde2 | 1309 | device->wakeup.flags.valid = 1; |
9b83ccd2 | 1310 | device->wakeup.prepare_count = 0; |
f517709d | 1311 | acpi_bus_set_run_wake_flags(device); |
729b2bdb ZY |
1312 | /* Call _PSW/_DSW object to disable its ability to wake the sleeping |
1313 | * system for the ACPI device with the _PRW object. | |
1314 | * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. | |
1315 | * So it is necessary to call _DSW object first. Only when it is not | |
1316 | * present will the _PSW object used. | |
1317 | */ | |
e88c9c60 RW |
1318 | err = acpi_device_sleep_wake(device, 0, 0, 0); |
1319 | if (err) | |
77e76609 RW |
1320 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1321 | "error in _DSW or _PSW evaluation\n")); | |
1da177e4 | 1322 | } |
1da177e4 | 1323 | |
f33ce568 RW |
1324 | static void acpi_bus_init_power_state(struct acpi_device *device, int state) |
1325 | { | |
1326 | struct acpi_device_power_state *ps = &device->power.states[state]; | |
ef85bdbe RW |
1327 | char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; |
1328 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
f33ce568 | 1329 | acpi_status status; |
bf325f95 | 1330 | |
f33ce568 RW |
1331 | INIT_LIST_HEAD(&ps->resources); |
1332 | ||
ef85bdbe RW |
1333 | /* Evaluate "_PRx" to get referenced power resources */ |
1334 | status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); | |
1335 | if (ACPI_SUCCESS(status)) { | |
1336 | union acpi_object *package = buffer.pointer; | |
1337 | ||
1338 | if (buffer.length && package | |
1339 | && package->type == ACPI_TYPE_PACKAGE | |
1340 | && package->package.count) { | |
e88c9c60 RW |
1341 | int err = acpi_extract_power_resources(package, 0, |
1342 | &ps->resources); | |
1343 | if (!err) | |
ef85bdbe | 1344 | device->power.flags.power_resources = 1; |
f33ce568 | 1345 | } |
ef85bdbe | 1346 | ACPI_FREE(buffer.pointer); |
f33ce568 RW |
1347 | } |
1348 | ||
1349 | /* Evaluate "_PSx" to see if we can do explicit sets */ | |
ef85bdbe | 1350 | pathname[2] = 'S'; |
952c63e9 | 1351 | if (acpi_has_method(device->handle, pathname)) |
f33ce568 RW |
1352 | ps->flags.explicit_set = 1; |
1353 | ||
1354 | /* | |
1355 | * State is valid if there are means to put the device into it. | |
1356 | * D3hot is only valid if _PR3 present. | |
1357 | */ | |
ef85bdbe | 1358 | if (!list_empty(&ps->resources) |
f33ce568 RW |
1359 | || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) { |
1360 | ps->flags.valid = 1; | |
1361 | ps->flags.os_accessible = 1; | |
1362 | } | |
1363 | ||
1364 | ps->power = -1; /* Unknown - driver assigned */ | |
1365 | ps->latency = -1; /* Unknown - driver assigned */ | |
1366 | } | |
1367 | ||
d43e167d | 1368 | static void acpi_bus_get_power_flags(struct acpi_device *device) |
1da177e4 | 1369 | { |
8bc5053b | 1370 | u32 i; |
1a365616 | 1371 | |
d43e167d | 1372 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ |
952c63e9 JL |
1373 | if (!acpi_has_method(device->handle, "_PS0") && |
1374 | !acpi_has_method(device->handle, "_PR0")) | |
1375 | return; | |
1a365616 | 1376 | |
d43e167d | 1377 | device->flags.power_manageable = 1; |
4be44fcd | 1378 | |
9e89dde2 ZR |
1379 | /* |
1380 | * Power Management Flags | |
1381 | */ | |
952c63e9 | 1382 | if (acpi_has_method(device->handle, "_PSC")) |
9e89dde2 | 1383 | device->power.flags.explicit_get = 1; |
952c63e9 | 1384 | if (acpi_has_method(device->handle, "_IRC")) |
9e89dde2 | 1385 | device->power.flags.inrush_current = 1; |
1da177e4 | 1386 | |
9e89dde2 ZR |
1387 | /* |
1388 | * Enumerate supported power management states | |
1389 | */ | |
f33ce568 RW |
1390 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) |
1391 | acpi_bus_init_power_state(device, i); | |
bf325f95 | 1392 | |
0b224527 | 1393 | INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); |
1da177e4 | 1394 | |
9e89dde2 ZR |
1395 | /* Set defaults for D0 and D3 states (always valid) */ |
1396 | device->power.states[ACPI_STATE_D0].flags.valid = 1; | |
1397 | device->power.states[ACPI_STATE_D0].power = 100; | |
8ad928d5 RW |
1398 | device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; |
1399 | device->power.states[ACPI_STATE_D3_COLD].power = 0; | |
c8f7a62c | 1400 | |
5c7dd710 RW |
1401 | /* Set D3cold's explicit_set flag if _PS3 exists. */ |
1402 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set) | |
1403 | device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1; | |
1404 | ||
1399dfcd AL |
1405 | /* Presence of _PS3 or _PRx means we can put the device into D3 cold */ |
1406 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set || | |
1407 | device->power.flags.power_resources) | |
1408 | device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1; | |
1409 | ||
b3785492 RW |
1410 | if (acpi_bus_init_power(device)) { |
1411 | acpi_free_power_resources_lists(device); | |
1412 | device->flags.power_manageable = 0; | |
1413 | } | |
9e89dde2 | 1414 | } |
c8f7a62c | 1415 | |
d43e167d | 1416 | static void acpi_bus_get_flags(struct acpi_device *device) |
1da177e4 | 1417 | { |
1da177e4 | 1418 | /* Presence of _STA indicates 'dynamic_status' */ |
952c63e9 | 1419 | if (acpi_has_method(device->handle, "_STA")) |
1da177e4 LT |
1420 | device->flags.dynamic_status = 1; |
1421 | ||
1da177e4 | 1422 | /* Presence of _RMV indicates 'removable' */ |
952c63e9 | 1423 | if (acpi_has_method(device->handle, "_RMV")) |
1da177e4 LT |
1424 | device->flags.removable = 1; |
1425 | ||
1426 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ | |
952c63e9 JL |
1427 | if (acpi_has_method(device->handle, "_EJD") || |
1428 | acpi_has_method(device->handle, "_EJ0")) | |
1da177e4 | 1429 | device->flags.ejectable = 1; |
1da177e4 LT |
1430 | } |
1431 | ||
c7bcb4e9 | 1432 | static void acpi_device_get_busid(struct acpi_device *device) |
1da177e4 | 1433 | { |
4be44fcd LB |
1434 | char bus_id[5] = { '?', 0 }; |
1435 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; | |
1436 | int i = 0; | |
1da177e4 LT |
1437 | |
1438 | /* | |
1439 | * Bus ID | |
1440 | * ------ | |
1441 | * The device's Bus ID is simply the object name. | |
1442 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? | |
1443 | */ | |
859ac9a4 | 1444 | if (ACPI_IS_ROOT_DEVICE(device)) { |
1da177e4 | 1445 | strcpy(device->pnp.bus_id, "ACPI"); |
859ac9a4 BH |
1446 | return; |
1447 | } | |
1448 | ||
1449 | switch (device->device_type) { | |
1da177e4 LT |
1450 | case ACPI_BUS_TYPE_POWER_BUTTON: |
1451 | strcpy(device->pnp.bus_id, "PWRF"); | |
1452 | break; | |
1453 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
1454 | strcpy(device->pnp.bus_id, "SLPF"); | |
1455 | break; | |
1456 | default: | |
66b7ed40 | 1457 | acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); |
1da177e4 LT |
1458 | /* Clean up trailing underscores (if any) */ |
1459 | for (i = 3; i > 1; i--) { | |
1460 | if (bus_id[i] == '_') | |
1461 | bus_id[i] = '\0'; | |
1462 | else | |
1463 | break; | |
1464 | } | |
1465 | strcpy(device->pnp.bus_id, bus_id); | |
1466 | break; | |
1467 | } | |
1468 | } | |
1469 | ||
ebf4df8d JL |
1470 | /* |
1471 | * acpi_ata_match - see if an acpi object is an ATA device | |
1472 | * | |
1473 | * If an acpi object has one of the ACPI ATA methods defined, | |
1474 | * then we can safely call it an ATA device. | |
1475 | */ | |
1476 | bool acpi_ata_match(acpi_handle handle) | |
1477 | { | |
1478 | return acpi_has_method(handle, "_GTF") || | |
1479 | acpi_has_method(handle, "_GTM") || | |
1480 | acpi_has_method(handle, "_STM") || | |
1481 | acpi_has_method(handle, "_SDD"); | |
1482 | } | |
1483 | ||
54735266 | 1484 | /* |
d4e1a692 | 1485 | * acpi_bay_match - see if an acpi object is an ejectable driver bay |
54735266 ZR |
1486 | * |
1487 | * If an acpi object is ejectable and has one of the ACPI ATA methods defined, | |
1488 | * then we can safely call it an ejectable drive bay | |
1489 | */ | |
ebf4df8d | 1490 | bool acpi_bay_match(acpi_handle handle) |
d4e1a692 | 1491 | { |
54735266 ZR |
1492 | acpi_handle phandle; |
1493 | ||
952c63e9 | 1494 | if (!acpi_has_method(handle, "_EJ0")) |
ebf4df8d JL |
1495 | return false; |
1496 | if (acpi_ata_match(handle)) | |
1497 | return true; | |
1498 | if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) | |
1499 | return false; | |
54735266 | 1500 | |
ebf4df8d | 1501 | return acpi_ata_match(phandle); |
54735266 ZR |
1502 | } |
1503 | ||
3620f2f2 | 1504 | /* |
d4e1a692 | 1505 | * acpi_dock_match - see if an acpi object has a _DCK method |
3620f2f2 | 1506 | */ |
ebf4df8d | 1507 | bool acpi_dock_match(acpi_handle handle) |
3620f2f2 | 1508 | { |
ebf4df8d | 1509 | return acpi_has_method(handle, "_DCK"); |
3620f2f2 FS |
1510 | } |
1511 | ||
620e112c | 1512 | const char *acpi_device_hid(struct acpi_device *device) |
15b8dd53 | 1513 | { |
7f47fa6c | 1514 | struct acpi_hardware_id *hid; |
15b8dd53 | 1515 | |
2b2ae7c7 TR |
1516 | if (list_empty(&device->pnp.ids)) |
1517 | return dummy_hid; | |
1518 | ||
7f47fa6c BH |
1519 | hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); |
1520 | return hid->id; | |
1521 | } | |
1522 | EXPORT_SYMBOL(acpi_device_hid); | |
15b8dd53 | 1523 | |
d4e1a692 | 1524 | static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) |
7f47fa6c BH |
1525 | { |
1526 | struct acpi_hardware_id *id; | |
15b8dd53 | 1527 | |
7f47fa6c BH |
1528 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
1529 | if (!id) | |
1530 | return; | |
15b8dd53 | 1531 | |
581de59e | 1532 | id->id = kstrdup(dev_id, GFP_KERNEL); |
7f47fa6c BH |
1533 | if (!id->id) { |
1534 | kfree(id); | |
1535 | return; | |
15b8dd53 BM |
1536 | } |
1537 | ||
d4e1a692 TK |
1538 | list_add_tail(&id->list, &pnp->ids); |
1539 | pnp->type.hardware_id = 1; | |
15b8dd53 BM |
1540 | } |
1541 | ||
222e82ac DW |
1542 | /* |
1543 | * Old IBM workstations have a DSDT bug wherein the SMBus object | |
1544 | * lacks the SMBUS01 HID and the methods do not have the necessary "_" | |
1545 | * prefix. Work around this. | |
1546 | */ | |
ebf4df8d | 1547 | static bool acpi_ibm_smbus_match(acpi_handle handle) |
222e82ac | 1548 | { |
ebf4df8d JL |
1549 | char node_name[ACPI_PATH_SEGMENT_LENGTH]; |
1550 | struct acpi_buffer path = { sizeof(node_name), node_name }; | |
222e82ac DW |
1551 | |
1552 | if (!dmi_name_in_vendors("IBM")) | |
ebf4df8d | 1553 | return false; |
222e82ac DW |
1554 | |
1555 | /* Look for SMBS object */ | |
ebf4df8d JL |
1556 | if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || |
1557 | strcmp("SMBS", path.pointer)) | |
1558 | return false; | |
222e82ac DW |
1559 | |
1560 | /* Does it have the necessary (but misnamed) methods? */ | |
952c63e9 JL |
1561 | if (acpi_has_method(handle, "SBI") && |
1562 | acpi_has_method(handle, "SBR") && | |
1563 | acpi_has_method(handle, "SBW")) | |
ebf4df8d JL |
1564 | return true; |
1565 | ||
1566 | return false; | |
222e82ac DW |
1567 | } |
1568 | ||
c0af4175 TK |
1569 | static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, |
1570 | int device_type) | |
1da177e4 | 1571 | { |
4be44fcd | 1572 | acpi_status status; |
57f3674f | 1573 | struct acpi_device_info *info; |
78e25fef | 1574 | struct acpi_pnp_device_id_list *cid_list; |
7f47fa6c | 1575 | int i; |
1da177e4 | 1576 | |
c0af4175 | 1577 | switch (device_type) { |
1da177e4 | 1578 | case ACPI_BUS_TYPE_DEVICE: |
c0af4175 TK |
1579 | if (handle == ACPI_ROOT_OBJECT) { |
1580 | acpi_add_id(pnp, ACPI_SYSTEM_HID); | |
859ac9a4 BH |
1581 | break; |
1582 | } | |
1583 | ||
c0af4175 | 1584 | status = acpi_get_object_info(handle, &info); |
1da177e4 | 1585 | if (ACPI_FAILURE(status)) { |
c0af4175 TK |
1586 | pr_err(PREFIX "%s: Error reading device info\n", |
1587 | __func__); | |
1da177e4 LT |
1588 | return; |
1589 | } | |
1590 | ||
1da177e4 | 1591 | if (info->valid & ACPI_VALID_HID) |
c0af4175 | 1592 | acpi_add_id(pnp, info->hardware_id.string); |
57f3674f | 1593 | if (info->valid & ACPI_VALID_CID) { |
15b8dd53 | 1594 | cid_list = &info->compatible_id_list; |
57f3674f | 1595 | for (i = 0; i < cid_list->count; i++) |
c0af4175 | 1596 | acpi_add_id(pnp, cid_list->ids[i].string); |
57f3674f | 1597 | } |
1da177e4 | 1598 | if (info->valid & ACPI_VALID_ADR) { |
c0af4175 TK |
1599 | pnp->bus_address = info->address; |
1600 | pnp->type.bus_address = 1; | |
1da177e4 | 1601 | } |
ccf78040 | 1602 | if (info->valid & ACPI_VALID_UID) |
c0af4175 | 1603 | pnp->unique_id = kstrdup(info->unique_id.string, |
ccf78040 | 1604 | GFP_KERNEL); |
ae843332 | 1605 | |
a83893ae BH |
1606 | kfree(info); |
1607 | ||
57f3674f BH |
1608 | /* |
1609 | * Some devices don't reliably have _HIDs & _CIDs, so add | |
1610 | * synthetic HIDs to make sure drivers can find them. | |
1611 | */ | |
c0af4175 TK |
1612 | if (acpi_is_video_device(handle)) |
1613 | acpi_add_id(pnp, ACPI_VIDEO_HID); | |
ebf4df8d | 1614 | else if (acpi_bay_match(handle)) |
c0af4175 | 1615 | acpi_add_id(pnp, ACPI_BAY_HID); |
ebf4df8d | 1616 | else if (acpi_dock_match(handle)) |
c0af4175 | 1617 | acpi_add_id(pnp, ACPI_DOCK_HID); |
ebf4df8d | 1618 | else if (acpi_ibm_smbus_match(handle)) |
c0af4175 TK |
1619 | acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); |
1620 | else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) { | |
1621 | acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */ | |
1622 | strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); | |
1623 | strcpy(pnp->device_class, ACPI_BUS_CLASS); | |
b7b30de5 | 1624 | } |
54735266 | 1625 | |
1da177e4 LT |
1626 | break; |
1627 | case ACPI_BUS_TYPE_POWER: | |
c0af4175 | 1628 | acpi_add_id(pnp, ACPI_POWER_HID); |
1da177e4 LT |
1629 | break; |
1630 | case ACPI_BUS_TYPE_PROCESSOR: | |
c0af4175 | 1631 | acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); |
1da177e4 | 1632 | break; |
1da177e4 | 1633 | case ACPI_BUS_TYPE_THERMAL: |
c0af4175 | 1634 | acpi_add_id(pnp, ACPI_THERMAL_HID); |
1da177e4 LT |
1635 | break; |
1636 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
c0af4175 | 1637 | acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); |
1da177e4 LT |
1638 | break; |
1639 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
c0af4175 | 1640 | acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); |
1da177e4 LT |
1641 | break; |
1642 | } | |
1da177e4 LT |
1643 | } |
1644 | ||
c0af4175 TK |
1645 | void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) |
1646 | { | |
1647 | struct acpi_hardware_id *id, *tmp; | |
1648 | ||
1649 | list_for_each_entry_safe(id, tmp, &pnp->ids, list) { | |
1650 | kfree(id->id); | |
1651 | kfree(id); | |
1652 | } | |
1653 | kfree(pnp->unique_id); | |
1654 | } | |
1655 | ||
82c7d5ef RW |
1656 | void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, |
1657 | int type, unsigned long long sta) | |
1da177e4 | 1658 | { |
d43e167d RW |
1659 | INIT_LIST_HEAD(&device->pnp.ids); |
1660 | device->device_type = type; | |
1661 | device->handle = handle; | |
1662 | device->parent = acpi_bus_get_parent(handle); | |
1663 | STRUCT_TO_INT(device->status) = sta; | |
1664 | acpi_device_get_busid(device); | |
c0af4175 | 1665 | acpi_set_pnp_ids(handle, &device->pnp, type); |
d43e167d | 1666 | acpi_bus_get_flags(device); |
2c0d4fe0 | 1667 | device->flags.match_driver = false; |
cf860be6 RW |
1668 | device_initialize(&device->dev); |
1669 | dev_set_uevent_suppress(&device->dev, true); | |
1670 | } | |
bc3b0772 | 1671 | |
cf860be6 RW |
1672 | void acpi_device_add_finalize(struct acpi_device *device) |
1673 | { | |
1674 | dev_set_uevent_suppress(&device->dev, false); | |
1675 | kobject_uevent(&device->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
1676 | } |
1677 | ||
5c478f49 BH |
1678 | static int acpi_add_single_object(struct acpi_device **child, |
1679 | acpi_handle handle, int type, | |
2c0d4fe0 | 1680 | unsigned long long sta) |
1da177e4 | 1681 | { |
77c24888 BH |
1682 | int result; |
1683 | struct acpi_device *device; | |
29aaefa6 | 1684 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1da177e4 | 1685 | |
36bcbec7 | 1686 | device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
1da177e4 | 1687 | if (!device) { |
6468463a | 1688 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
d550d98d | 1689 | return -ENOMEM; |
1da177e4 | 1690 | } |
1da177e4 | 1691 | |
d43e167d RW |
1692 | acpi_init_device_object(device, handle, type, sta); |
1693 | acpi_bus_get_power_flags(device); | |
d57d09a4 | 1694 | acpi_bus_get_wakeup_device_flags(device); |
1da177e4 | 1695 | |
cf860be6 | 1696 | result = acpi_device_add(device, acpi_device_release); |
d43e167d | 1697 | if (result) { |
718fb0de | 1698 | acpi_device_release(&device->dev); |
d43e167d RW |
1699 | return result; |
1700 | } | |
1da177e4 | 1701 | |
d43e167d | 1702 | acpi_power_add_remove_device(device, true); |
cf860be6 | 1703 | acpi_device_add_finalize(device); |
d43e167d RW |
1704 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
1705 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n", | |
1706 | dev_name(&device->dev), (char *) buffer.pointer, | |
1707 | device->parent ? dev_name(&device->parent->dev) : "(null)")); | |
1708 | kfree(buffer.pointer); | |
1709 | *child = device; | |
1710 | return 0; | |
bf325f95 RW |
1711 | } |
1712 | ||
778cbc1d BH |
1713 | static int acpi_bus_type_and_status(acpi_handle handle, int *type, |
1714 | unsigned long long *sta) | |
1da177e4 | 1715 | { |
778cbc1d BH |
1716 | acpi_status status; |
1717 | acpi_object_type acpi_type; | |
1da177e4 | 1718 | |
778cbc1d | 1719 | status = acpi_get_type(handle, &acpi_type); |
51a85faf | 1720 | if (ACPI_FAILURE(status)) |
778cbc1d | 1721 | return -ENODEV; |
4be44fcd | 1722 | |
778cbc1d | 1723 | switch (acpi_type) { |
51a85faf BH |
1724 | case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ |
1725 | case ACPI_TYPE_DEVICE: | |
778cbc1d BH |
1726 | *type = ACPI_BUS_TYPE_DEVICE; |
1727 | status = acpi_bus_get_status_handle(handle, sta); | |
1728 | if (ACPI_FAILURE(status)) | |
1729 | return -ENODEV; | |
51a85faf BH |
1730 | break; |
1731 | case ACPI_TYPE_PROCESSOR: | |
778cbc1d BH |
1732 | *type = ACPI_BUS_TYPE_PROCESSOR; |
1733 | status = acpi_bus_get_status_handle(handle, sta); | |
1734 | if (ACPI_FAILURE(status)) | |
1735 | return -ENODEV; | |
51a85faf BH |
1736 | break; |
1737 | case ACPI_TYPE_THERMAL: | |
778cbc1d BH |
1738 | *type = ACPI_BUS_TYPE_THERMAL; |
1739 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1740 | break; |
1741 | case ACPI_TYPE_POWER: | |
778cbc1d BH |
1742 | *type = ACPI_BUS_TYPE_POWER; |
1743 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1744 | break; |
1745 | default: | |
778cbc1d | 1746 | return -ENODEV; |
51a85faf | 1747 | } |
1da177e4 | 1748 | |
778cbc1d BH |
1749 | return 0; |
1750 | } | |
1751 | ||
4b59cc1f RW |
1752 | static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, |
1753 | char *idstr, | |
1754 | const struct acpi_device_id **matchid) | |
1755 | { | |
1756 | const struct acpi_device_id *devid; | |
1757 | ||
1758 | for (devid = handler->ids; devid->id[0]; devid++) | |
1759 | if (!strcmp((char *)devid->id, idstr)) { | |
1760 | if (matchid) | |
1761 | *matchid = devid; | |
1762 | ||
1763 | return true; | |
1764 | } | |
1765 | ||
1766 | return false; | |
1767 | } | |
1768 | ||
6b772e8f TK |
1769 | static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr, |
1770 | const struct acpi_device_id **matchid) | |
1771 | { | |
1772 | struct acpi_scan_handler *handler; | |
1773 | ||
1774 | list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) | |
1775 | if (acpi_scan_handler_matching(handler, idstr, matchid)) | |
1776 | return handler; | |
1777 | ||
1778 | return NULL; | |
1779 | } | |
1780 | ||
3f8055c3 RW |
1781 | void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) |
1782 | { | |
3f8055c3 RW |
1783 | if (!!hotplug->enabled == !!val) |
1784 | return; | |
1785 | ||
1786 | mutex_lock(&acpi_scan_lock); | |
1787 | ||
1788 | hotplug->enabled = val; | |
3f8055c3 RW |
1789 | |
1790 | mutex_unlock(&acpi_scan_lock); | |
1791 | } | |
1792 | ||
6b772e8f | 1793 | static void acpi_scan_init_hotplug(acpi_handle handle, int type) |
a33ec399 | 1794 | { |
6b772e8f TK |
1795 | struct acpi_device_pnp pnp = {}; |
1796 | struct acpi_hardware_id *hwid; | |
a33ec399 RW |
1797 | struct acpi_scan_handler *handler; |
1798 | ||
6b772e8f TK |
1799 | INIT_LIST_HEAD(&pnp.ids); |
1800 | acpi_set_pnp_ids(handle, &pnp, type); | |
a33ec399 | 1801 | |
6b772e8f | 1802 | if (!pnp.type.hardware_id) |
7a26b530 | 1803 | goto out; |
a33ec399 RW |
1804 | |
1805 | /* | |
1806 | * This relies on the fact that acpi_install_notify_handler() will not | |
1807 | * install the same notify handler routine twice for the same handle. | |
1808 | */ | |
6b772e8f TK |
1809 | list_for_each_entry(hwid, &pnp.ids, list) { |
1810 | handler = acpi_scan_match_handler(hwid->id, NULL); | |
1811 | if (handler) { | |
2cbb14fb TK |
1812 | acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
1813 | acpi_hotplug_notify_cb, handler); | |
6b772e8f TK |
1814 | break; |
1815 | } | |
1816 | } | |
1817 | ||
7a26b530 | 1818 | out: |
6b772e8f | 1819 | acpi_free_pnp_ids(&pnp); |
a33ec399 RW |
1820 | } |
1821 | ||
e3863094 RW |
1822 | static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, |
1823 | void *not_used, void **return_value) | |
778cbc1d | 1824 | { |
805d410f | 1825 | struct acpi_device *device = NULL; |
778cbc1d BH |
1826 | int type; |
1827 | unsigned long long sta; | |
1828 | int result; | |
1829 | ||
4002bf38 RW |
1830 | acpi_bus_get_device(handle, &device); |
1831 | if (device) | |
1832 | goto out; | |
1833 | ||
778cbc1d BH |
1834 | result = acpi_bus_type_and_status(handle, &type, &sta); |
1835 | if (result) | |
1836 | return AE_OK; | |
1837 | ||
82c7d5ef RW |
1838 | if (type == ACPI_BUS_TYPE_POWER) { |
1839 | acpi_add_power_resource(handle); | |
1840 | return AE_OK; | |
1841 | } | |
1842 | ||
6b772e8f | 1843 | acpi_scan_init_hotplug(handle, type); |
a33ec399 | 1844 | |
778cbc1d | 1845 | if (!(sta & ACPI_STA_DEVICE_PRESENT) && |
b581a7f9 | 1846 | !(sta & ACPI_STA_DEVICE_FUNCTIONING)) { |
86e4e20e | 1847 | struct acpi_device_wakeup wakeup; |
86e4e20e | 1848 | |
952c63e9 | 1849 | if (acpi_has_method(handle, "_PRW")) { |
86e4e20e RW |
1850 | acpi_bus_extract_wakeup_device_power_package(handle, |
1851 | &wakeup); | |
993cbe59 RW |
1852 | acpi_power_resources_list_free(&wakeup.resources); |
1853 | } | |
778cbc1d | 1854 | return AE_CTRL_DEPTH; |
b581a7f9 | 1855 | } |
778cbc1d | 1856 | |
2c0d4fe0 | 1857 | acpi_add_single_object(&device, handle, type, sta); |
e3b87f8a | 1858 | if (!device) |
51a85faf | 1859 | return AE_CTRL_DEPTH; |
1da177e4 | 1860 | |
4002bf38 | 1861 | out: |
51a85faf BH |
1862 | if (!*return_value) |
1863 | *return_value = device; | |
805d410f | 1864 | |
51a85faf BH |
1865 | return AE_OK; |
1866 | } | |
3fb02738 | 1867 | |
c5698074 | 1868 | static int acpi_scan_attach_handler(struct acpi_device *device) |
ca589f94 | 1869 | { |
c5698074 RW |
1870 | struct acpi_hardware_id *hwid; |
1871 | int ret = 0; | |
ca589f94 | 1872 | |
c5698074 | 1873 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
87b85b3c | 1874 | const struct acpi_device_id *devid; |
c5698074 | 1875 | struct acpi_scan_handler *handler; |
ca589f94 | 1876 | |
c5698074 RW |
1877 | handler = acpi_scan_match_handler(hwid->id, &devid); |
1878 | if (handler) { | |
87b85b3c RW |
1879 | ret = handler->attach(device, devid); |
1880 | if (ret > 0) { | |
1881 | device->handler = handler; | |
c5698074 | 1882 | break; |
87b85b3c | 1883 | } else if (ret < 0) { |
c5698074 | 1884 | break; |
87b85b3c | 1885 | } |
ca589f94 RW |
1886 | } |
1887 | } | |
1888 | return ret; | |
1889 | } | |
1890 | ||
0fc300b0 RW |
1891 | static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used, |
1892 | void *not_used, void **ret_not_used) | |
51a85faf | 1893 | { |
805d410f RW |
1894 | struct acpi_device *device; |
1895 | unsigned long long sta_not_used; | |
ca589f94 | 1896 | int ret; |
3fb02738 | 1897 | |
805d410f RW |
1898 | /* |
1899 | * Ignore errors ignored by acpi_bus_check_add() to avoid terminating | |
1900 | * namespace walks prematurely. | |
1901 | */ | |
ca589f94 | 1902 | if (acpi_bus_type_and_status(handle, &ret, &sta_not_used)) |
805d410f | 1903 | return AE_OK; |
1da177e4 | 1904 | |
805d410f RW |
1905 | if (acpi_bus_get_device(handle, &device)) |
1906 | return AE_CTRL_DEPTH; | |
7779688f | 1907 | |
3a391a39 RW |
1908 | if (device->handler) |
1909 | return AE_OK; | |
1910 | ||
ca589f94 | 1911 | ret = acpi_scan_attach_handler(device); |
6931007c RW |
1912 | if (ret < 0) |
1913 | return AE_CTRL_DEPTH; | |
1914 | ||
1915 | device->flags.match_driver = true; | |
1916 | if (ret > 0) | |
1917 | return AE_OK; | |
ca589f94 RW |
1918 | |
1919 | ret = device_attach(&device->dev); | |
1920 | return ret >= 0 ? AE_OK : AE_CTRL_DEPTH; | |
1da177e4 | 1921 | } |
1da177e4 | 1922 | |
636458de | 1923 | /** |
b8bd759a | 1924 | * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. |
636458de | 1925 | * @handle: Root of the namespace scope to scan. |
7779688f | 1926 | * |
636458de RW |
1927 | * Scan a given ACPI tree (probably recently hot-plugged) and create and add |
1928 | * found devices. | |
7779688f | 1929 | * |
636458de RW |
1930 | * If no devices were found, -ENODEV is returned, but it does not mean that |
1931 | * there has been a real error. There just have been no suitable ACPI objects | |
1932 | * in the table trunk from which the kernel could create a device and add an | |
1933 | * appropriate driver. | |
3757b948 RW |
1934 | * |
1935 | * Must be called under acpi_scan_lock. | |
7779688f | 1936 | */ |
b8bd759a | 1937 | int acpi_bus_scan(acpi_handle handle) |
3fb02738 | 1938 | { |
b8bd759a | 1939 | void *device = NULL; |
c511cc19 | 1940 | int error = 0; |
3fb02738 | 1941 | |
b8bd759a RW |
1942 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device))) |
1943 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
1944 | acpi_bus_check_add, NULL, NULL, &device); | |
3fb02738 | 1945 | |
d2f6650a | 1946 | if (!device) |
c511cc19 RW |
1947 | error = -ENODEV; |
1948 | else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL))) | |
b8bd759a RW |
1949 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
1950 | acpi_bus_device_attach, NULL, NULL, NULL); | |
3fb02738 | 1951 | |
c511cc19 | 1952 | return error; |
3fb02738 | 1953 | } |
b8bd759a | 1954 | EXPORT_SYMBOL(acpi_bus_scan); |
a2100801 | 1955 | |
05404d8f RW |
1956 | static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used, |
1957 | void *not_used, void **ret_not_used) | |
1958 | { | |
1959 | struct acpi_device *device = NULL; | |
a2100801 | 1960 | |
05404d8f | 1961 | if (!acpi_bus_get_device(handle, &device)) { |
ca589f94 RW |
1962 | struct acpi_scan_handler *dev_handler = device->handler; |
1963 | ||
ca589f94 RW |
1964 | if (dev_handler) { |
1965 | if (dev_handler->detach) | |
1966 | dev_handler->detach(device); | |
1967 | ||
1968 | device->handler = NULL; | |
1969 | } else { | |
1970 | device_release_driver(&device->dev); | |
1971 | } | |
05404d8f RW |
1972 | } |
1973 | return AE_OK; | |
3fb02738 | 1974 | } |
1da177e4 | 1975 | |
05404d8f RW |
1976 | static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used, |
1977 | void *not_used, void **ret_not_used) | |
1da177e4 | 1978 | { |
05404d8f | 1979 | struct acpi_device *device = NULL; |
4be44fcd | 1980 | |
05404d8f RW |
1981 | if (!acpi_bus_get_device(handle, &device)) |
1982 | acpi_device_unregister(device); | |
1da177e4 | 1983 | |
05404d8f RW |
1984 | return AE_OK; |
1985 | } | |
1da177e4 | 1986 | |
3757b948 RW |
1987 | /** |
1988 | * acpi_bus_trim - Remove ACPI device node and all of its descendants | |
1989 | * @start: Root of the ACPI device nodes subtree to remove. | |
1990 | * | |
1991 | * Must be called under acpi_scan_lock. | |
1992 | */ | |
bfee26db | 1993 | void acpi_bus_trim(struct acpi_device *start) |
1da177e4 | 1994 | { |
05404d8f RW |
1995 | /* |
1996 | * Execute acpi_bus_device_detach() as a post-order callback to detach | |
1997 | * all ACPI drivers from the device nodes being removed. | |
1998 | */ | |
1999 | acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL, | |
2000 | acpi_bus_device_detach, NULL, NULL); | |
2001 | acpi_bus_device_detach(start->handle, 0, NULL, NULL); | |
cecdb193 RW |
2002 | /* |
2003 | * Execute acpi_bus_remove() as a post-order callback to remove device | |
2004 | * nodes in the given namespace scope. | |
2005 | */ | |
2006 | acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL, | |
2007 | acpi_bus_remove, NULL, NULL); | |
2008 | acpi_bus_remove(start->handle, 0, NULL, NULL); | |
1da177e4 | 2009 | } |
ceaba663 KA |
2010 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
2011 | ||
e8b945c9 | 2012 | static int acpi_bus_scan_fixed(void) |
1da177e4 | 2013 | { |
4be44fcd | 2014 | int result = 0; |
c4168bff | 2015 | |
1da177e4 LT |
2016 | /* |
2017 | * Enumerate all fixed-feature devices. | |
2018 | */ | |
2c0d4fe0 RW |
2019 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { |
2020 | struct acpi_device *device = NULL; | |
2021 | ||
5c478f49 | 2022 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2023 | ACPI_BUS_TYPE_POWER_BUTTON, |
2c0d4fe0 RW |
2024 | ACPI_STA_DEFAULT); |
2025 | if (result) | |
2026 | return result; | |
2027 | ||
2028 | result = device_attach(&device->dev); | |
2029 | if (result < 0) | |
2030 | return result; | |
2031 | ||
c10d7a13 | 2032 | device_init_wakeup(&device->dev, true); |
3fb02738 | 2033 | } |
1da177e4 | 2034 | |
2c0d4fe0 RW |
2035 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { |
2036 | struct acpi_device *device = NULL; | |
2037 | ||
5c478f49 | 2038 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2039 | ACPI_BUS_TYPE_SLEEP_BUTTON, |
2c0d4fe0 RW |
2040 | ACPI_STA_DEFAULT); |
2041 | if (result) | |
2042 | return result; | |
2043 | ||
2044 | result = device_attach(&device->dev); | |
3fb02738 | 2045 | } |
1da177e4 | 2046 | |
2c0d4fe0 | 2047 | return result < 0 ? result : 0; |
1da177e4 LT |
2048 | } |
2049 | ||
e747f274 | 2050 | int __init acpi_scan_init(void) |
1da177e4 LT |
2051 | { |
2052 | int result; | |
1da177e4 | 2053 | |
5b327265 PM |
2054 | result = bus_register(&acpi_bus_type); |
2055 | if (result) { | |
2056 | /* We don't want to quit even if we failed to add suspend/resume */ | |
2057 | printk(KERN_ERR PREFIX "Could not register bus type\n"); | |
2058 | } | |
2059 | ||
92ef2a25 | 2060 | acpi_pci_root_init(); |
4daeaf68 | 2061 | acpi_pci_link_init(); |
ac212b69 | 2062 | acpi_processor_init(); |
141a297b | 2063 | acpi_platform_init(); |
f58b082a | 2064 | acpi_lpss_init(); |
2fa97feb | 2065 | acpi_cmos_rtc_init(); |
737f1a9f | 2066 | acpi_container_init(); |
0a347644 | 2067 | acpi_memory_hotplug_init(); |
94add0f8 | 2068 | acpi_dock_init(); |
97d9a9e9 | 2069 | |
3757b948 | 2070 | mutex_lock(&acpi_scan_lock); |
1da177e4 LT |
2071 | /* |
2072 | * Enumerate devices in the ACPI namespace. | |
2073 | */ | |
0cd6ac52 RW |
2074 | result = acpi_bus_scan(ACPI_ROOT_OBJECT); |
2075 | if (result) | |
3757b948 | 2076 | goto out; |
1da177e4 | 2077 | |
0cd6ac52 | 2078 | result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); |
1da177e4 | 2079 | if (result) |
3757b948 | 2080 | goto out; |
1da177e4 | 2081 | |
b8bd759a RW |
2082 | result = acpi_bus_scan_fixed(); |
2083 | if (result) { | |
b17b537a | 2084 | acpi_device_unregister(acpi_root); |
3757b948 | 2085 | goto out; |
b8bd759a | 2086 | } |
1da177e4 | 2087 | |
b8bd759a | 2088 | acpi_update_all_gpes(); |
3757b948 | 2089 | |
668192b6 YL |
2090 | acpi_pci_root_hp_init(); |
2091 | ||
3757b948 RW |
2092 | out: |
2093 | mutex_unlock(&acpi_scan_lock); | |
2094 | return result; | |
1da177e4 | 2095 | } |