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 | ||
683058e3 RW |
128 | static acpi_status acpi_bus_offline_companions(acpi_handle handle, u32 lvl, |
129 | void *data, void **ret_p) | |
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 | ||
139 | mutex_lock(&device->physical_node_lock); | |
140 | ||
141 | list_for_each_entry(pn, &device->physical_node_list, node) { | |
142 | int ret; | |
143 | ||
303bfdb1 RW |
144 | if (second_pass) { |
145 | /* Skip devices offlined by the first pass. */ | |
146 | if (pn->put_online) | |
147 | continue; | |
148 | } else { | |
149 | pn->put_online = false; | |
150 | } | |
683058e3 RW |
151 | ret = device_offline(pn->dev); |
152 | if (acpi_force_hot_remove) | |
153 | continue; | |
154 | ||
303bfdb1 RW |
155 | if (ret >= 0) { |
156 | pn->put_online = !ret; | |
157 | } else { | |
158 | *ret_p = pn->dev; | |
159 | if (second_pass) { | |
160 | status = AE_ERROR; | |
161 | break; | |
162 | } | |
683058e3 | 163 | } |
683058e3 RW |
164 | } |
165 | ||
166 | mutex_unlock(&device->physical_node_lock); | |
167 | ||
168 | return status; | |
169 | } | |
170 | ||
171 | static acpi_status acpi_bus_online_companions(acpi_handle handle, u32 lvl, | |
172 | void *data, void **ret_p) | |
173 | { | |
174 | struct acpi_device *device = NULL; | |
175 | struct acpi_device_physical_node *pn; | |
176 | ||
177 | if (acpi_bus_get_device(handle, &device)) | |
178 | return AE_OK; | |
179 | ||
180 | mutex_lock(&device->physical_node_lock); | |
181 | ||
182 | list_for_each_entry(pn, &device->physical_node_list, node) | |
183 | if (pn->put_online) { | |
184 | device_online(pn->dev); | |
185 | pn->put_online = false; | |
186 | } | |
187 | ||
188 | mutex_unlock(&device->physical_node_lock); | |
189 | ||
190 | return AE_OK; | |
191 | } | |
192 | ||
a33ec399 | 193 | static int acpi_scan_hot_remove(struct acpi_device *device) |
1da177e4 | 194 | { |
5993c467 | 195 | acpi_handle handle = device->handle; |
303bfdb1 | 196 | struct device *errdev; |
a33ec399 | 197 | acpi_status status; |
882fd12e | 198 | unsigned long long sta; |
f058cdf4 | 199 | |
3757b948 | 200 | /* If there is no handle, the device node has been unregistered. */ |
a33ec399 | 201 | if (!handle) { |
3757b948 RW |
202 | dev_dbg(&device->dev, "ACPI handle missing\n"); |
203 | put_device(&device->dev); | |
a33ec399 | 204 | return -EINVAL; |
3757b948 RW |
205 | } |
206 | ||
303bfdb1 RW |
207 | /* |
208 | * Carry out two passes here and ignore errors in the first pass, | |
209 | * because if the devices in question are memory blocks and | |
210 | * CONFIG_MEMCG is set, one of the blocks may hold data structures | |
211 | * that the other blocks depend on, but it is not known in advance which | |
212 | * block holds them. | |
213 | * | |
214 | * If the first pass is successful, the second one isn't needed, though. | |
215 | */ | |
216 | errdev = NULL; | |
217 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
218 | NULL, acpi_bus_offline_companions, | |
219 | (void *)false, (void **)&errdev); | |
220 | acpi_bus_offline_companions(handle, 0, (void *)false, (void **)&errdev); | |
221 | if (errdev) { | |
222 | errdev = NULL; | |
683058e3 | 223 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
303bfdb1 RW |
224 | NULL, acpi_bus_offline_companions, |
225 | (void *)true , (void **)&errdev); | |
226 | if (!errdev || acpi_force_hot_remove) | |
227 | acpi_bus_offline_companions(handle, 0, (void *)true, | |
228 | (void **)&errdev); | |
229 | ||
230 | if (errdev && !acpi_force_hot_remove) { | |
231 | dev_warn(errdev, "Offline failed.\n"); | |
232 | acpi_bus_online_companions(handle, 0, NULL, NULL); | |
233 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, | |
234 | ACPI_UINT32_MAX, | |
235 | acpi_bus_online_companions, NULL, | |
236 | NULL, NULL); | |
303bfdb1 RW |
237 | put_device(&device->dev); |
238 | return -EBUSY; | |
239 | } | |
683058e3 RW |
240 | } |
241 | ||
26d46867 | 242 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
0794469d | 243 | "Hot-removing device %s...\n", dev_name(&device->dev))); |
26d46867 | 244 | |
bfee26db | 245 | acpi_bus_trim(device); |
683058e3 | 246 | |
3757b948 RW |
247 | /* Device node has been unregistered. */ |
248 | put_device(&device->dev); | |
b3c450c3 TK |
249 | device = NULL; |
250 | ||
7d2421f8 | 251 | acpi_evaluate_lck(handle, 0); |
1da177e4 LT |
252 | /* |
253 | * TBD: _EJD support. | |
254 | */ | |
7d2421f8 JL |
255 | status = acpi_evaluate_ej0(handle); |
256 | if (status == AE_NOT_FOUND) | |
257 | return -ENODEV; | |
258 | else if (ACPI_FAILURE(status)) | |
259 | return -EIO; | |
1da177e4 | 260 | |
882fd12e TK |
261 | /* |
262 | * Verify if eject was indeed successful. If not, log an error | |
263 | * message. No need to call _OST since _EJ0 call was made OK. | |
264 | */ | |
265 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
266 | if (ACPI_FAILURE(status)) { | |
267 | acpi_handle_warn(handle, | |
268 | "Status check after eject failed (0x%x)\n", status); | |
269 | } else if (sta & ACPI_STA_DEVICE_ENABLED) { | |
270 | acpi_handle_warn(handle, | |
271 | "Eject incomplete - status 0x%llx\n", sta); | |
272 | } | |
273 | ||
a33ec399 RW |
274 | return 0; |
275 | } | |
1da177e4 | 276 | |
a33ec399 RW |
277 | static void acpi_bus_device_eject(void *context) |
278 | { | |
279 | acpi_handle handle = context; | |
280 | struct acpi_device *device = NULL; | |
281 | struct acpi_scan_handler *handler; | |
282 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; | |
f943db40 | 283 | int error; |
a33ec399 | 284 | |
e0ae8fee | 285 | lock_device_hotplug(); |
a33ec399 RW |
286 | mutex_lock(&acpi_scan_lock); |
287 | ||
288 | acpi_bus_get_device(handle, &device); | |
289 | if (!device) | |
290 | goto err_out; | |
291 | ||
292 | handler = device->handler; | |
293 | if (!handler || !handler->hotplug.enabled) { | |
294 | ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; | |
295 | goto err_out; | |
296 | } | |
297 | acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, | |
298 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); | |
f943db40 | 299 | if (handler->hotplug.mode == AHM_CONTAINER) |
a33ec399 | 300 | kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); |
a33ec399 | 301 | |
f943db40 RW |
302 | get_device(&device->dev); |
303 | error = acpi_scan_hot_remove(device); | |
304 | if (error) | |
305 | goto err_out; | |
1da177e4 | 306 | |
3757b948 | 307 | out: |
f058cdf4 | 308 | mutex_unlock(&acpi_scan_lock); |
e0ae8fee | 309 | unlock_device_hotplug(); |
c8d72a5e | 310 | return; |
a33ec399 RW |
311 | |
312 | err_out: | |
313 | acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code, | |
314 | NULL); | |
315 | goto out; | |
316 | } | |
317 | ||
318 | static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source) | |
319 | { | |
320 | struct acpi_device *device = NULL; | |
321 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; | |
322 | int error; | |
323 | ||
683058e3 | 324 | lock_device_hotplug(); |
e0ae8fee | 325 | mutex_lock(&acpi_scan_lock); |
a33ec399 | 326 | |
8832f7e4 RW |
327 | if (ost_source != ACPI_NOTIFY_BUS_CHECK) { |
328 | acpi_bus_get_device(handle, &device); | |
329 | if (device) { | |
330 | dev_warn(&device->dev, "Attempt to re-insert\n"); | |
331 | goto out; | |
332 | } | |
a33ec399 RW |
333 | } |
334 | acpi_evaluate_hotplug_ost(handle, ost_source, | |
335 | ACPI_OST_SC_INSERT_IN_PROGRESS, NULL); | |
336 | error = acpi_bus_scan(handle); | |
337 | if (error) { | |
338 | acpi_handle_warn(handle, "Namespace scan failure\n"); | |
339 | goto out; | |
340 | } | |
341 | error = acpi_bus_get_device(handle, &device); | |
342 | if (error) { | |
343 | acpi_handle_warn(handle, "Missing device node object\n"); | |
344 | goto out; | |
345 | } | |
346 | ost_code = ACPI_OST_SC_SUCCESS; | |
347 | if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER) | |
348 | kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); | |
349 | ||
350 | out: | |
351 | acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL); | |
352 | mutex_unlock(&acpi_scan_lock); | |
e0ae8fee | 353 | unlock_device_hotplug(); |
a33ec399 RW |
354 | } |
355 | ||
356 | static void acpi_scan_bus_check(void *context) | |
357 | { | |
358 | acpi_scan_bus_device_check((acpi_handle)context, | |
359 | ACPI_NOTIFY_BUS_CHECK); | |
360 | } | |
361 | ||
362 | static void acpi_scan_device_check(void *context) | |
363 | { | |
364 | acpi_scan_bus_device_check((acpi_handle)context, | |
365 | ACPI_NOTIFY_DEVICE_CHECK); | |
366 | } | |
367 | ||
2cbb14fb TK |
368 | static void acpi_hotplug_unsupported(acpi_handle handle, u32 type) |
369 | { | |
370 | u32 ost_status; | |
371 | ||
372 | switch (type) { | |
373 | case ACPI_NOTIFY_BUS_CHECK: | |
374 | acpi_handle_debug(handle, | |
375 | "ACPI_NOTIFY_BUS_CHECK event: unsupported\n"); | |
376 | ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED; | |
377 | break; | |
378 | case ACPI_NOTIFY_DEVICE_CHECK: | |
379 | acpi_handle_debug(handle, | |
380 | "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n"); | |
381 | ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED; | |
382 | break; | |
383 | case ACPI_NOTIFY_EJECT_REQUEST: | |
384 | acpi_handle_debug(handle, | |
385 | "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n"); | |
386 | ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED; | |
387 | break; | |
388 | default: | |
389 | /* non-hotplug event; possibly handled by other handler */ | |
390 | return; | |
391 | } | |
392 | ||
393 | acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL); | |
394 | } | |
395 | ||
396 | static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) | |
a33ec399 RW |
397 | { |
398 | acpi_osd_exec_callback callback; | |
2cbb14fb | 399 | struct acpi_scan_handler *handler = data; |
a33ec399 RW |
400 | acpi_status status; |
401 | ||
2cbb14fb TK |
402 | if (!handler->hotplug.enabled) |
403 | return acpi_hotplug_unsupported(handle, type); | |
404 | ||
a33ec399 RW |
405 | switch (type) { |
406 | case ACPI_NOTIFY_BUS_CHECK: | |
407 | acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); | |
408 | callback = acpi_scan_bus_check; | |
409 | break; | |
410 | case ACPI_NOTIFY_DEVICE_CHECK: | |
411 | acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); | |
412 | callback = acpi_scan_device_check; | |
413 | break; | |
414 | case ACPI_NOTIFY_EJECT_REQUEST: | |
415 | acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); | |
416 | callback = acpi_bus_device_eject; | |
417 | break; | |
418 | default: | |
419 | /* non-hotplug event; possibly handled by other handler */ | |
420 | return; | |
421 | } | |
422 | status = acpi_os_hotplug_execute(callback, handle); | |
423 | if (ACPI_FAILURE(status)) | |
424 | acpi_evaluate_hotplug_ost(handle, type, | |
425 | ACPI_OST_SC_NON_SPECIFIC_FAILURE, | |
426 | NULL); | |
427 | } | |
428 | ||
429 | /** | |
430 | * acpi_bus_hot_remove_device: hot-remove a device and its children | |
431 | * @context: struct acpi_eject_event pointer (freed in this func) | |
432 | * | |
433 | * Hot-remove a device and its children. This function frees up the | |
434 | * memory space passed by arg context, so that the caller may call | |
435 | * this function asynchronously through acpi_os_hotplug_execute(). | |
436 | */ | |
437 | void acpi_bus_hot_remove_device(void *context) | |
438 | { | |
439 | struct acpi_eject_event *ej_event = context; | |
440 | struct acpi_device *device = ej_event->device; | |
441 | acpi_handle handle = device->handle; | |
442 | int error; | |
443 | ||
e0ae8fee | 444 | lock_device_hotplug(); |
a33ec399 RW |
445 | mutex_lock(&acpi_scan_lock); |
446 | ||
447 | error = acpi_scan_hot_remove(device); | |
448 | if (error && handle) | |
449 | acpi_evaluate_hotplug_ost(handle, ej_event->event, | |
450 | ACPI_OST_SC_NON_SPECIFIC_FAILURE, | |
451 | NULL); | |
452 | ||
453 | mutex_unlock(&acpi_scan_lock); | |
e0ae8fee | 454 | unlock_device_hotplug(); |
a33ec399 | 455 | kfree(context); |
1da177e4 | 456 | } |
61622acc | 457 | EXPORT_SYMBOL(acpi_bus_hot_remove_device); |
1da177e4 | 458 | |
836aedb1 RW |
459 | static ssize_t real_power_state_show(struct device *dev, |
460 | struct device_attribute *attr, char *buf) | |
461 | { | |
462 | struct acpi_device *adev = to_acpi_device(dev); | |
463 | int state; | |
464 | int ret; | |
465 | ||
466 | ret = acpi_device_get_power(adev, &state); | |
467 | if (ret) | |
468 | return ret; | |
469 | ||
470 | return sprintf(buf, "%s\n", acpi_power_state_string(state)); | |
471 | } | |
472 | ||
473 | static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL); | |
474 | ||
475 | static ssize_t power_state_show(struct device *dev, | |
476 | struct device_attribute *attr, char *buf) | |
477 | { | |
478 | struct acpi_device *adev = to_acpi_device(dev); | |
479 | ||
480 | return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state)); | |
481 | } | |
482 | ||
483 | static DEVICE_ATTR(power_state, 0444, power_state_show, NULL); | |
484 | ||
1da177e4 | 485 | static ssize_t |
f883d9db PM |
486 | acpi_eject_store(struct device *d, struct device_attribute *attr, |
487 | const char *buf, size_t count) | |
1da177e4 | 488 | { |
f883d9db | 489 | struct acpi_device *acpi_device = to_acpi_device(d); |
c4753e57 | 490 | struct acpi_eject_event *ej_event; |
a33ec399 RW |
491 | acpi_object_type not_used; |
492 | acpi_status status; | |
a33ec399 | 493 | int ret; |
1da177e4 | 494 | |
a33ec399 | 495 | if (!count || buf[0] != '1') |
1da177e4 | 496 | return -EINVAL; |
1da177e4 | 497 | |
a33ec399 RW |
498 | if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled) |
499 | && !acpi_device->driver) | |
500 | return -ENODEV; | |
501 | ||
502 | status = acpi_get_type(acpi_device->handle, ¬_used); | |
503 | if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable) | |
504 | return -ENODEV; | |
505 | ||
a33ec399 RW |
506 | ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL); |
507 | if (!ej_event) { | |
508 | ret = -ENOMEM; | |
509 | goto err_out; | |
510 | } | |
f943db40 | 511 | acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, |
a33ec399 RW |
512 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); |
513 | ej_event->device = acpi_device; | |
f943db40 | 514 | ej_event->event = ACPI_OST_EC_OSPM_EJECT; |
a33ec399 | 515 | get_device(&acpi_device->dev); |
3757b948 | 516 | status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event); |
f943db40 RW |
517 | if (ACPI_SUCCESS(status)) |
518 | return count; | |
a33ec399 | 519 | |
f943db40 RW |
520 | put_device(&acpi_device->dev); |
521 | kfree(ej_event); | |
522 | ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN; | |
a33ec399 RW |
523 | |
524 | err_out: | |
f943db40 | 525 | acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, |
a33ec399 | 526 | ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); |
f943db40 | 527 | return ret; |
1da177e4 LT |
528 | } |
529 | ||
f883d9db | 530 | static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); |
1da177e4 | 531 | |
e49bd2dd ZR |
532 | static ssize_t |
533 | acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
534 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
1da177e4 | 535 | |
ea8d82fd | 536 | return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev)); |
1da177e4 | 537 | } |
e49bd2dd | 538 | static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); |
1da177e4 | 539 | |
923d4a45 LZ |
540 | static ssize_t acpi_device_uid_show(struct device *dev, |
541 | struct device_attribute *attr, char *buf) | |
542 | { | |
543 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
544 | ||
545 | return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id); | |
546 | } | |
547 | static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL); | |
548 | ||
549 | static ssize_t acpi_device_adr_show(struct device *dev, | |
550 | struct device_attribute *attr, char *buf) | |
551 | { | |
552 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
553 | ||
554 | return sprintf(buf, "0x%08x\n", | |
555 | (unsigned int)(acpi_dev->pnp.bus_address)); | |
556 | } | |
557 | static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL); | |
558 | ||
e49bd2dd ZR |
559 | static ssize_t |
560 | acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
561 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
562 | struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; | |
563 | int result; | |
1da177e4 | 564 | |
e49bd2dd | 565 | result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); |
0c526d96 | 566 | if (result) |
e49bd2dd | 567 | goto end; |
1da177e4 | 568 | |
e49bd2dd ZR |
569 | result = sprintf(buf, "%s\n", (char*)path.pointer); |
570 | kfree(path.pointer); | |
0c526d96 | 571 | end: |
e49bd2dd | 572 | return result; |
1da177e4 | 573 | } |
e49bd2dd | 574 | static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); |
1da177e4 | 575 | |
d1efe3c3 LO |
576 | /* sysfs file that shows description text from the ACPI _STR method */ |
577 | static ssize_t description_show(struct device *dev, | |
578 | struct device_attribute *attr, | |
579 | char *buf) { | |
580 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
581 | int result; | |
582 | ||
583 | if (acpi_dev->pnp.str_obj == NULL) | |
584 | return 0; | |
585 | ||
586 | /* | |
587 | * The _STR object contains a Unicode identifier for a device. | |
588 | * We need to convert to utf-8 so it can be displayed. | |
589 | */ | |
590 | result = utf16s_to_utf8s( | |
591 | (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer, | |
592 | acpi_dev->pnp.str_obj->buffer.length, | |
593 | UTF16_LITTLE_ENDIAN, buf, | |
594 | PAGE_SIZE); | |
595 | ||
596 | buf[result++] = '\n'; | |
597 | ||
598 | return result; | |
599 | } | |
600 | static DEVICE_ATTR(description, 0444, description_show, NULL); | |
601 | ||
bb74ac23 YI |
602 | static ssize_t |
603 | acpi_device_sun_show(struct device *dev, struct device_attribute *attr, | |
604 | char *buf) { | |
605 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
606 | ||
607 | return sprintf(buf, "%lu\n", acpi_dev->pnp.sun); | |
608 | } | |
609 | static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL); | |
610 | ||
e49bd2dd | 611 | static int acpi_device_setup_files(struct acpi_device *dev) |
1da177e4 | 612 | { |
d1efe3c3 | 613 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
f883d9db | 614 | acpi_status status; |
bb74ac23 | 615 | unsigned long long sun; |
e49bd2dd | 616 | int result = 0; |
1da177e4 LT |
617 | |
618 | /* | |
e49bd2dd | 619 | * Devices gotten from FADT don't have a "path" attribute |
1da177e4 | 620 | */ |
0c526d96 | 621 | if (dev->handle) { |
e49bd2dd | 622 | result = device_create_file(&dev->dev, &dev_attr_path); |
0c526d96 | 623 | if (result) |
e49bd2dd | 624 | goto end; |
1da177e4 LT |
625 | } |
626 | ||
2b2ae7c7 TR |
627 | if (!list_empty(&dev->pnp.ids)) { |
628 | result = device_create_file(&dev->dev, &dev_attr_hid); | |
629 | if (result) | |
630 | goto end; | |
1da177e4 | 631 | |
2b2ae7c7 TR |
632 | result = device_create_file(&dev->dev, &dev_attr_modalias); |
633 | if (result) | |
634 | goto end; | |
635 | } | |
29b71a1c | 636 | |
d1efe3c3 LO |
637 | /* |
638 | * If device has _STR, 'description' file is created | |
639 | */ | |
952c63e9 | 640 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
641 | status = acpi_evaluate_object(dev->handle, "_STR", |
642 | NULL, &buffer); | |
643 | if (ACPI_FAILURE(status)) | |
644 | buffer.pointer = NULL; | |
645 | dev->pnp.str_obj = buffer.pointer; | |
646 | result = device_create_file(&dev->dev, &dev_attr_description); | |
647 | if (result) | |
648 | goto end; | |
649 | } | |
650 | ||
d4e1a692 | 651 | if (dev->pnp.type.bus_address) |
923d4a45 LZ |
652 | result = device_create_file(&dev->dev, &dev_attr_adr); |
653 | if (dev->pnp.unique_id) | |
654 | result = device_create_file(&dev->dev, &dev_attr_uid); | |
655 | ||
bb74ac23 YI |
656 | status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun); |
657 | if (ACPI_SUCCESS(status)) { | |
658 | dev->pnp.sun = (unsigned long)sun; | |
659 | result = device_create_file(&dev->dev, &dev_attr_sun); | |
660 | if (result) | |
661 | goto end; | |
662 | } else { | |
663 | dev->pnp.sun = (unsigned long)-1; | |
664 | } | |
665 | ||
e49bd2dd ZR |
666 | /* |
667 | * If device has _EJ0, 'eject' file is created that is used to trigger | |
668 | * hot-removal function from userland. | |
669 | */ | |
952c63e9 | 670 | if (acpi_has_method(dev->handle, "_EJ0")) { |
e49bd2dd | 671 | result = device_create_file(&dev->dev, &dev_attr_eject); |
836aedb1 RW |
672 | if (result) |
673 | return result; | |
674 | } | |
675 | ||
676 | if (dev->flags.power_manageable) { | |
677 | result = device_create_file(&dev->dev, &dev_attr_power_state); | |
678 | if (result) | |
679 | return result; | |
680 | ||
681 | if (dev->power.flags.power_resources) | |
682 | result = device_create_file(&dev->dev, | |
683 | &dev_attr_real_power_state); | |
684 | } | |
685 | ||
0c526d96 | 686 | end: |
e49bd2dd | 687 | return result; |
1da177e4 LT |
688 | } |
689 | ||
f883d9db | 690 | static void acpi_device_remove_files(struct acpi_device *dev) |
1da177e4 | 691 | { |
836aedb1 RW |
692 | if (dev->flags.power_manageable) { |
693 | device_remove_file(&dev->dev, &dev_attr_power_state); | |
694 | if (dev->power.flags.power_resources) | |
695 | device_remove_file(&dev->dev, | |
696 | &dev_attr_real_power_state); | |
697 | } | |
698 | ||
f883d9db | 699 | /* |
d1efe3c3 LO |
700 | * If device has _STR, remove 'description' file |
701 | */ | |
952c63e9 | 702 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
703 | kfree(dev->pnp.str_obj); |
704 | device_remove_file(&dev->dev, &dev_attr_description); | |
705 | } | |
706 | /* | |
707 | * If device has _EJ0, remove 'eject' file. | |
f883d9db | 708 | */ |
952c63e9 | 709 | if (acpi_has_method(dev->handle, "_EJ0")) |
f883d9db | 710 | device_remove_file(&dev->dev, &dev_attr_eject); |
1da177e4 | 711 | |
952c63e9 | 712 | if (acpi_has_method(dev->handle, "_SUN")) |
bb74ac23 YI |
713 | device_remove_file(&dev->dev, &dev_attr_sun); |
714 | ||
923d4a45 LZ |
715 | if (dev->pnp.unique_id) |
716 | device_remove_file(&dev->dev, &dev_attr_uid); | |
d4e1a692 | 717 | if (dev->pnp.type.bus_address) |
923d4a45 | 718 | device_remove_file(&dev->dev, &dev_attr_adr); |
1131b938 BH |
719 | device_remove_file(&dev->dev, &dev_attr_modalias); |
720 | device_remove_file(&dev->dev, &dev_attr_hid); | |
0c526d96 | 721 | if (dev->handle) |
e49bd2dd | 722 | device_remove_file(&dev->dev, &dev_attr_path); |
1da177e4 | 723 | } |
1da177e4 | 724 | /* -------------------------------------------------------------------------- |
9e89dde2 | 725 | ACPI Bus operations |
1da177e4 | 726 | -------------------------------------------------------------------------- */ |
29b71a1c | 727 | |
cf761af9 MW |
728 | static const struct acpi_device_id *__acpi_match_device( |
729 | struct acpi_device *device, const struct acpi_device_id *ids) | |
29b71a1c TR |
730 | { |
731 | const struct acpi_device_id *id; | |
7f47fa6c | 732 | struct acpi_hardware_id *hwid; |
29b71a1c | 733 | |
39a0ad87 ZY |
734 | /* |
735 | * If the device is not present, it is unnecessary to load device | |
736 | * driver for it. | |
737 | */ | |
738 | if (!device->status.present) | |
cf761af9 | 739 | return NULL; |
39a0ad87 | 740 | |
7f47fa6c BH |
741 | for (id = ids; id->id[0]; id++) |
742 | list_for_each_entry(hwid, &device->pnp.ids, list) | |
743 | if (!strcmp((char *) id->id, hwid->id)) | |
cf761af9 MW |
744 | return id; |
745 | ||
746 | return NULL; | |
747 | } | |
748 | ||
749 | /** | |
750 | * acpi_match_device - Match a struct device against a given list of ACPI IDs | |
751 | * @ids: Array of struct acpi_device_id object to match against. | |
752 | * @dev: The device structure to match. | |
753 | * | |
754 | * Check if @dev has a valid ACPI handle and if there is a struct acpi_device | |
755 | * object for that handle and use that object to match against a given list of | |
756 | * device IDs. | |
757 | * | |
758 | * Return a pointer to the first matching ID on success or %NULL on failure. | |
759 | */ | |
760 | const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, | |
761 | const struct device *dev) | |
762 | { | |
763 | struct acpi_device *adev; | |
0613e1f7 | 764 | acpi_handle handle = ACPI_HANDLE(dev); |
cf761af9 | 765 | |
0613e1f7 | 766 | if (!ids || !handle || acpi_bus_get_device(handle, &adev)) |
cf761af9 MW |
767 | return NULL; |
768 | ||
769 | return __acpi_match_device(adev, ids); | |
770 | } | |
771 | EXPORT_SYMBOL_GPL(acpi_match_device); | |
29b71a1c | 772 | |
cf761af9 MW |
773 | int acpi_match_device_ids(struct acpi_device *device, |
774 | const struct acpi_device_id *ids) | |
775 | { | |
776 | return __acpi_match_device(device, ids) ? 0 : -ENOENT; | |
29b71a1c TR |
777 | } |
778 | EXPORT_SYMBOL(acpi_match_device_ids); | |
779 | ||
0b224527 RW |
780 | static void acpi_free_power_resources_lists(struct acpi_device *device) |
781 | { | |
782 | int i; | |
783 | ||
993cbe59 RW |
784 | if (device->wakeup.flags.valid) |
785 | acpi_power_resources_list_free(&device->wakeup.resources); | |
786 | ||
0b224527 RW |
787 | if (!device->flags.power_manageable) |
788 | return; | |
789 | ||
790 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { | |
791 | struct acpi_device_power_state *ps = &device->power.states[i]; | |
792 | acpi_power_resources_list_free(&ps->resources); | |
793 | } | |
7f47fa6c BH |
794 | } |
795 | ||
1890a97a | 796 | static void acpi_device_release(struct device *dev) |
1da177e4 | 797 | { |
1890a97a | 798 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1da177e4 | 799 | |
c0af4175 | 800 | acpi_free_pnp_ids(&acpi_dev->pnp); |
0b224527 | 801 | acpi_free_power_resources_lists(acpi_dev); |
1890a97a | 802 | kfree(acpi_dev); |
1da177e4 LT |
803 | } |
804 | ||
5d9464a4 | 805 | static int acpi_bus_match(struct device *dev, struct device_driver *drv) |
9e89dde2 | 806 | { |
5d9464a4 PM |
807 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
808 | struct acpi_driver *acpi_drv = to_acpi_driver(drv); | |
1da177e4 | 809 | |
209d3b17 | 810 | return acpi_dev->flags.match_driver |
805d410f | 811 | && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); |
5d9464a4 | 812 | } |
1da177e4 | 813 | |
7eff2e7a | 814 | static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 | 815 | { |
5d9464a4 | 816 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
7eff2e7a | 817 | int len; |
5d9464a4 | 818 | |
2b2ae7c7 TR |
819 | if (list_empty(&acpi_dev->pnp.ids)) |
820 | return 0; | |
821 | ||
7eff2e7a KS |
822 | if (add_uevent_var(env, "MODALIAS=")) |
823 | return -ENOMEM; | |
824 | len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], | |
825 | sizeof(env->buf) - env->buflen); | |
826 | if (len >= (sizeof(env->buf) - env->buflen)) | |
827 | return -ENOMEM; | |
828 | env->buflen += len; | |
9e89dde2 | 829 | return 0; |
1da177e4 LT |
830 | } |
831 | ||
46ec8598 BH |
832 | static void acpi_device_notify(acpi_handle handle, u32 event, void *data) |
833 | { | |
834 | struct acpi_device *device = data; | |
835 | ||
836 | device->driver->ops.notify(device, event); | |
837 | } | |
838 | ||
839 | static acpi_status acpi_device_notify_fixed(void *data) | |
840 | { | |
841 | struct acpi_device *device = data; | |
842 | ||
53de5356 BH |
843 | /* Fixed hardware devices have no handles */ |
844 | acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); | |
46ec8598 BH |
845 | return AE_OK; |
846 | } | |
847 | ||
848 | static int acpi_device_install_notify_handler(struct acpi_device *device) | |
849 | { | |
850 | acpi_status status; | |
46ec8598 | 851 | |
ccba2a36 | 852 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 BH |
853 | status = |
854 | acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, | |
855 | acpi_device_notify_fixed, | |
856 | device); | |
ccba2a36 | 857 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 BH |
858 | status = |
859 | acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, | |
860 | acpi_device_notify_fixed, | |
861 | device); | |
862 | else | |
863 | status = acpi_install_notify_handler(device->handle, | |
864 | ACPI_DEVICE_NOTIFY, | |
865 | acpi_device_notify, | |
866 | device); | |
867 | ||
868 | if (ACPI_FAILURE(status)) | |
869 | return -EINVAL; | |
870 | return 0; | |
871 | } | |
872 | ||
873 | static void acpi_device_remove_notify_handler(struct acpi_device *device) | |
874 | { | |
ccba2a36 | 875 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 BH |
876 | acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
877 | acpi_device_notify_fixed); | |
ccba2a36 | 878 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 BH |
879 | acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, |
880 | acpi_device_notify_fixed); | |
881 | else | |
882 | acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, | |
883 | acpi_device_notify); | |
884 | } | |
885 | ||
d9e455f5 | 886 | static int acpi_device_probe(struct device *dev) |
1da177e4 | 887 | { |
5d9464a4 PM |
888 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
889 | struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); | |
890 | int ret; | |
891 | ||
24071f47 RW |
892 | if (acpi_dev->handler) |
893 | return -EINVAL; | |
894 | ||
d9e455f5 RW |
895 | if (!acpi_drv->ops.add) |
896 | return -ENOSYS; | |
46ec8598 | 897 | |
d9e455f5 RW |
898 | ret = acpi_drv->ops.add(acpi_dev); |
899 | if (ret) | |
900 | return ret; | |
46ec8598 | 901 | |
d9e455f5 RW |
902 | acpi_dev->driver = acpi_drv; |
903 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
904 | "Driver [%s] successfully bound to device [%s]\n", | |
905 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
906 | ||
907 | if (acpi_drv->ops.notify) { | |
908 | ret = acpi_device_install_notify_handler(acpi_dev); | |
909 | if (ret) { | |
910 | if (acpi_drv->ops.remove) | |
911 | acpi_drv->ops.remove(acpi_dev); | |
912 | ||
913 | acpi_dev->driver = NULL; | |
914 | acpi_dev->driver_data = NULL; | |
915 | return ret; | |
916 | } | |
5d9464a4 | 917 | } |
d9e455f5 RW |
918 | |
919 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", | |
920 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
921 | get_device(dev); | |
922 | return 0; | |
5d9464a4 | 923 | } |
1da177e4 | 924 | |
5d9464a4 PM |
925 | static int acpi_device_remove(struct device * dev) |
926 | { | |
927 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
928 | struct acpi_driver *acpi_drv = acpi_dev->driver; | |
929 | ||
930 | if (acpi_drv) { | |
46ec8598 BH |
931 | if (acpi_drv->ops.notify) |
932 | acpi_device_remove_notify_handler(acpi_dev); | |
5d9464a4 | 933 | if (acpi_drv->ops.remove) |
51fac838 | 934 | acpi_drv->ops.remove(acpi_dev); |
1da177e4 | 935 | } |
5d9464a4 | 936 | acpi_dev->driver = NULL; |
db89b4f0 | 937 | acpi_dev->driver_data = NULL; |
1da177e4 | 938 | |
5d9464a4 | 939 | put_device(dev); |
9e89dde2 ZR |
940 | return 0; |
941 | } | |
1da177e4 | 942 | |
55955aad | 943 | struct bus_type acpi_bus_type = { |
9e89dde2 | 944 | .name = "acpi", |
5d9464a4 PM |
945 | .match = acpi_bus_match, |
946 | .probe = acpi_device_probe, | |
947 | .remove = acpi_device_remove, | |
948 | .uevent = acpi_device_uevent, | |
9e89dde2 ZR |
949 | }; |
950 | ||
caf5c03f RW |
951 | static void acpi_bus_data_handler(acpi_handle handle, void *context) |
952 | { | |
953 | /* Intentionally empty. */ | |
954 | } | |
955 | ||
956 | int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) | |
957 | { | |
958 | acpi_status status; | |
959 | ||
960 | if (!device) | |
961 | return -EINVAL; | |
962 | ||
963 | status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device); | |
964 | if (ACPI_FAILURE(status) || !*device) { | |
965 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", | |
966 | handle)); | |
967 | return -ENODEV; | |
968 | } | |
969 | return 0; | |
970 | } | |
6585925b | 971 | EXPORT_SYMBOL(acpi_bus_get_device); |
caf5c03f | 972 | |
cf860be6 RW |
973 | int acpi_device_add(struct acpi_device *device, |
974 | void (*release)(struct device *)) | |
1da177e4 | 975 | { |
4be44fcd | 976 | int result; |
e49bd2dd ZR |
977 | struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; |
978 | int found = 0; | |
66b7ed40 | 979 | |
d43e167d RW |
980 | if (device->handle) { |
981 | acpi_status status; | |
982 | ||
983 | status = acpi_attach_data(device->handle, acpi_bus_data_handler, | |
984 | device); | |
985 | if (ACPI_FAILURE(status)) { | |
986 | acpi_handle_err(device->handle, | |
987 | "Unable to attach device data\n"); | |
988 | return -ENODEV; | |
989 | } | |
990 | } | |
991 | ||
9e89dde2 ZR |
992 | /* |
993 | * Linkage | |
994 | * ------- | |
995 | * Link this device to its parent and siblings. | |
996 | */ | |
997 | INIT_LIST_HEAD(&device->children); | |
998 | INIT_LIST_HEAD(&device->node); | |
9e89dde2 | 999 | INIT_LIST_HEAD(&device->wakeup_list); |
1033f904 LT |
1000 | INIT_LIST_HEAD(&device->physical_node_list); |
1001 | mutex_init(&device->physical_node_lock); | |
1da177e4 | 1002 | |
e49bd2dd ZR |
1003 | new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); |
1004 | if (!new_bus_id) { | |
d43e167d RW |
1005 | pr_err(PREFIX "Memory allocation error\n"); |
1006 | result = -ENOMEM; | |
1007 | goto err_detach; | |
1da177e4 | 1008 | } |
e49bd2dd | 1009 | |
9090589d | 1010 | mutex_lock(&acpi_device_lock); |
e49bd2dd ZR |
1011 | /* |
1012 | * Find suitable bus_id and instance number in acpi_bus_id_list | |
1013 | * If failed, create one and link it into acpi_bus_id_list | |
1014 | */ | |
1015 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { | |
1131b938 BH |
1016 | if (!strcmp(acpi_device_bus_id->bus_id, |
1017 | acpi_device_hid(device))) { | |
1018 | acpi_device_bus_id->instance_no++; | |
e49bd2dd ZR |
1019 | found = 1; |
1020 | kfree(new_bus_id); | |
1021 | break; | |
1022 | } | |
1da177e4 | 1023 | } |
0c526d96 | 1024 | if (!found) { |
e49bd2dd | 1025 | acpi_device_bus_id = new_bus_id; |
1131b938 | 1026 | strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); |
e49bd2dd ZR |
1027 | acpi_device_bus_id->instance_no = 0; |
1028 | list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); | |
1da177e4 | 1029 | } |
0794469d | 1030 | dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); |
1da177e4 | 1031 | |
33b57150 | 1032 | if (device->parent) |
9e89dde2 | 1033 | list_add_tail(&device->node, &device->parent->children); |
33b57150 | 1034 | |
9e89dde2 ZR |
1035 | if (device->wakeup.flags.valid) |
1036 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); | |
9090589d | 1037 | mutex_unlock(&acpi_device_lock); |
1da177e4 | 1038 | |
1890a97a | 1039 | if (device->parent) |
66b7ed40 | 1040 | device->dev.parent = &device->parent->dev; |
1890a97a | 1041 | device->dev.bus = &acpi_bus_type; |
82c7d5ef | 1042 | device->dev.release = release; |
cf860be6 | 1043 | result = device_add(&device->dev); |
0c526d96 | 1044 | if (result) { |
8b12b922 | 1045 | dev_err(&device->dev, "Error registering device\n"); |
d43e167d | 1046 | goto err; |
1da177e4 | 1047 | } |
1da177e4 | 1048 | |
e49bd2dd | 1049 | result = acpi_device_setup_files(device); |
0c526d96 | 1050 | if (result) |
0794469d KS |
1051 | printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", |
1052 | dev_name(&device->dev)); | |
1da177e4 | 1053 | |
1da177e4 | 1054 | return 0; |
d43e167d RW |
1055 | |
1056 | err: | |
9090589d | 1057 | mutex_lock(&acpi_device_lock); |
33b57150 | 1058 | if (device->parent) |
e49bd2dd | 1059 | list_del(&device->node); |
e49bd2dd | 1060 | list_del(&device->wakeup_list); |
9090589d | 1061 | mutex_unlock(&acpi_device_lock); |
d43e167d RW |
1062 | |
1063 | err_detach: | |
1064 | acpi_detach_data(device->handle, acpi_bus_data_handler); | |
e49bd2dd | 1065 | return result; |
1da177e4 LT |
1066 | } |
1067 | ||
b17b537a | 1068 | static void acpi_device_unregister(struct acpi_device *device) |
9e89dde2 | 1069 | { |
9090589d | 1070 | mutex_lock(&acpi_device_lock); |
33b57150 | 1071 | if (device->parent) |
9e89dde2 | 1072 | list_del(&device->node); |
1da177e4 | 1073 | |
9e89dde2 | 1074 | list_del(&device->wakeup_list); |
9090589d | 1075 | mutex_unlock(&acpi_device_lock); |
1da177e4 | 1076 | |
9e89dde2 | 1077 | acpi_detach_data(device->handle, acpi_bus_data_handler); |
1890a97a | 1078 | |
bc9b6407 | 1079 | acpi_power_add_remove_device(device, false); |
f883d9db | 1080 | acpi_device_remove_files(device); |
b1c0f99b RW |
1081 | if (device->remove) |
1082 | device->remove(device); | |
1083 | ||
cf860be6 | 1084 | device_del(&device->dev); |
bc9b6407 | 1085 | /* |
0aa120a0 RW |
1086 | * Transition the device to D3cold to drop the reference counts of all |
1087 | * power resources the device depends on and turn off the ones that have | |
1088 | * no more references. | |
bc9b6407 | 1089 | */ |
0aa120a0 | 1090 | acpi_device_set_power(device, ACPI_STATE_D3_COLD); |
3757b948 | 1091 | device->handle = NULL; |
cf860be6 | 1092 | put_device(&device->dev); |
1da177e4 LT |
1093 | } |
1094 | ||
9e89dde2 ZR |
1095 | /* -------------------------------------------------------------------------- |
1096 | Driver Management | |
1097 | -------------------------------------------------------------------------- */ | |
9e89dde2 ZR |
1098 | /** |
1099 | * acpi_bus_register_driver - register a driver with the ACPI bus | |
1100 | * @driver: driver being registered | |
1101 | * | |
1102 | * Registers a driver with the ACPI bus. Searches the namespace for all | |
1103 | * devices that match the driver's criteria and binds. Returns zero for | |
1104 | * success or a negative error status for failure. | |
1105 | */ | |
1106 | int acpi_bus_register_driver(struct acpi_driver *driver) | |
1da177e4 | 1107 | { |
1890a97a | 1108 | int ret; |
1da177e4 | 1109 | |
9e89dde2 ZR |
1110 | if (acpi_disabled) |
1111 | return -ENODEV; | |
1890a97a PM |
1112 | driver->drv.name = driver->name; |
1113 | driver->drv.bus = &acpi_bus_type; | |
1114 | driver->drv.owner = driver->owner; | |
1da177e4 | 1115 | |
1890a97a PM |
1116 | ret = driver_register(&driver->drv); |
1117 | return ret; | |
9e89dde2 | 1118 | } |
1da177e4 | 1119 | |
9e89dde2 ZR |
1120 | EXPORT_SYMBOL(acpi_bus_register_driver); |
1121 | ||
1122 | /** | |
b27b14ce | 1123 | * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus |
9e89dde2 ZR |
1124 | * @driver: driver to unregister |
1125 | * | |
1126 | * Unregisters a driver with the ACPI bus. Searches the namespace for all | |
1127 | * devices that match the driver's criteria and unbinds. | |
1128 | */ | |
1129 | void acpi_bus_unregister_driver(struct acpi_driver *driver) | |
1130 | { | |
1890a97a | 1131 | driver_unregister(&driver->drv); |
9e89dde2 ZR |
1132 | } |
1133 | ||
1134 | EXPORT_SYMBOL(acpi_bus_unregister_driver); | |
1135 | ||
9e89dde2 ZR |
1136 | /* -------------------------------------------------------------------------- |
1137 | Device Enumeration | |
1138 | -------------------------------------------------------------------------- */ | |
5c478f49 BH |
1139 | static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) |
1140 | { | |
456de893 | 1141 | struct acpi_device *device = NULL; |
5c478f49 | 1142 | acpi_status status; |
5c478f49 BH |
1143 | |
1144 | /* | |
1145 | * Fixed hardware devices do not appear in the namespace and do not | |
1146 | * have handles, but we fabricate acpi_devices for them, so we have | |
1147 | * to deal with them specially. | |
1148 | */ | |
456de893 | 1149 | if (!handle) |
5c478f49 BH |
1150 | return acpi_root; |
1151 | ||
1152 | do { | |
1153 | status = acpi_get_parent(handle, &handle); | |
5c478f49 | 1154 | if (ACPI_FAILURE(status)) |
456de893 RW |
1155 | return status == AE_NULL_ENTRY ? NULL : acpi_root; |
1156 | } while (acpi_bus_get_device(handle, &device)); | |
1157 | return device; | |
5c478f49 BH |
1158 | } |
1159 | ||
9e89dde2 ZR |
1160 | acpi_status |
1161 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) | |
1162 | { | |
1163 | acpi_status status; | |
1164 | acpi_handle tmp; | |
1165 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
1166 | union acpi_object *obj; | |
1167 | ||
1168 | status = acpi_get_handle(handle, "_EJD", &tmp); | |
1169 | if (ACPI_FAILURE(status)) | |
1170 | return status; | |
1171 | ||
1172 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); | |
1173 | if (ACPI_SUCCESS(status)) { | |
1174 | obj = buffer.pointer; | |
3b5fee59 HM |
1175 | status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, |
1176 | ejd); | |
9e89dde2 ZR |
1177 | kfree(buffer.pointer); |
1178 | } | |
1179 | return status; | |
1180 | } | |
1181 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); | |
1182 | ||
e88c9c60 RW |
1183 | static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle, |
1184 | struct acpi_device_wakeup *wakeup) | |
9e89dde2 | 1185 | { |
b581a7f9 RW |
1186 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1187 | union acpi_object *package = NULL; | |
9e89dde2 | 1188 | union acpi_object *element = NULL; |
b581a7f9 | 1189 | acpi_status status; |
e88c9c60 | 1190 | int err = -ENODATA; |
9e89dde2 | 1191 | |
b581a7f9 | 1192 | if (!wakeup) |
e88c9c60 | 1193 | return -EINVAL; |
9e89dde2 | 1194 | |
993cbe59 | 1195 | INIT_LIST_HEAD(&wakeup->resources); |
9e89dde2 | 1196 | |
b581a7f9 RW |
1197 | /* _PRW */ |
1198 | status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); | |
1199 | if (ACPI_FAILURE(status)) { | |
1200 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); | |
e88c9c60 | 1201 | return err; |
b581a7f9 RW |
1202 | } |
1203 | ||
1204 | package = (union acpi_object *)buffer.pointer; | |
1205 | ||
e88c9c60 | 1206 | if (!package || package->package.count < 2) |
b581a7f9 | 1207 | goto out; |
b581a7f9 | 1208 | |
9e89dde2 | 1209 | element = &(package->package.elements[0]); |
e88c9c60 | 1210 | if (!element) |
b581a7f9 | 1211 | goto out; |
e88c9c60 | 1212 | |
9e89dde2 ZR |
1213 | if (element->type == ACPI_TYPE_PACKAGE) { |
1214 | if ((element->package.count < 2) || | |
1215 | (element->package.elements[0].type != | |
1216 | ACPI_TYPE_LOCAL_REFERENCE) | |
e88c9c60 | 1217 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
b581a7f9 | 1218 | goto out; |
e88c9c60 | 1219 | |
b581a7f9 | 1220 | wakeup->gpe_device = |
9e89dde2 | 1221 | element->package.elements[0].reference.handle; |
b581a7f9 | 1222 | wakeup->gpe_number = |
9e89dde2 ZR |
1223 | (u32) element->package.elements[1].integer.value; |
1224 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
b581a7f9 RW |
1225 | wakeup->gpe_device = NULL; |
1226 | wakeup->gpe_number = element->integer.value; | |
1227 | } else { | |
b581a7f9 RW |
1228 | goto out; |
1229 | } | |
9e89dde2 ZR |
1230 | |
1231 | element = &(package->package.elements[1]); | |
e88c9c60 | 1232 | if (element->type != ACPI_TYPE_INTEGER) |
b581a7f9 | 1233 | goto out; |
e88c9c60 | 1234 | |
b581a7f9 | 1235 | wakeup->sleep_state = element->integer.value; |
9e89dde2 | 1236 | |
e88c9c60 RW |
1237 | err = acpi_extract_power_resources(package, 2, &wakeup->resources); |
1238 | if (err) | |
b581a7f9 | 1239 | goto out; |
9e89dde2 | 1240 | |
0596a52b RW |
1241 | if (!list_empty(&wakeup->resources)) { |
1242 | int sleep_state; | |
9e89dde2 | 1243 | |
b5d667eb RW |
1244 | err = acpi_power_wakeup_list_init(&wakeup->resources, |
1245 | &sleep_state); | |
1246 | if (err) { | |
1247 | acpi_handle_warn(handle, "Retrieving current states " | |
1248 | "of wakeup power resources failed\n"); | |
1249 | acpi_power_resources_list_free(&wakeup->resources); | |
1250 | goto out; | |
1251 | } | |
0596a52b RW |
1252 | if (sleep_state < wakeup->sleep_state) { |
1253 | acpi_handle_warn(handle, "Overriding _PRW sleep state " | |
1254 | "(S%d) by S%d from power resources\n", | |
1255 | (int)wakeup->sleep_state, sleep_state); | |
1256 | wakeup->sleep_state = sleep_state; | |
1257 | } | |
1258 | } | |
bba63a29 | 1259 | acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number); |
9874647b | 1260 | |
b581a7f9 RW |
1261 | out: |
1262 | kfree(buffer.pointer); | |
e88c9c60 | 1263 | return err; |
1da177e4 LT |
1264 | } |
1265 | ||
f517709d | 1266 | static void acpi_bus_set_run_wake_flags(struct acpi_device *device) |
1da177e4 | 1267 | { |
29b71a1c | 1268 | struct acpi_device_id button_device_ids[] = { |
29b71a1c | 1269 | {"PNP0C0C", 0}, |
b7e38304 | 1270 | {"PNP0C0D", 0}, |
29b71a1c TR |
1271 | {"PNP0C0E", 0}, |
1272 | {"", 0}, | |
1273 | }; | |
f517709d RW |
1274 | acpi_status status; |
1275 | acpi_event_status event_status; | |
1276 | ||
b67ea761 | 1277 | device->wakeup.flags.notifier_present = 0; |
f517709d RW |
1278 | |
1279 | /* Power button, Lid switch always enable wakeup */ | |
1280 | if (!acpi_match_device_ids(device, button_device_ids)) { | |
1281 | device->wakeup.flags.run_wake = 1; | |
b7e38304 ZR |
1282 | if (!acpi_match_device_ids(device, &button_device_ids[1])) { |
1283 | /* Do not use Lid/sleep button for S5 wakeup */ | |
1284 | if (device->wakeup.sleep_state == ACPI_STATE_S5) | |
1285 | device->wakeup.sleep_state = ACPI_STATE_S4; | |
1286 | } | |
f2b56bc8 | 1287 | device_set_wakeup_capable(&device->dev, true); |
f517709d RW |
1288 | return; |
1289 | } | |
1290 | ||
e8e18c95 RW |
1291 | status = acpi_get_gpe_status(device->wakeup.gpe_device, |
1292 | device->wakeup.gpe_number, | |
1293 | &event_status); | |
f517709d RW |
1294 | if (status == AE_OK) |
1295 | device->wakeup.flags.run_wake = | |
1296 | !!(event_status & ACPI_EVENT_FLAG_HANDLE); | |
1297 | } | |
1298 | ||
d57d09a4 | 1299 | static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
f517709d | 1300 | { |
e88c9c60 | 1301 | int err; |
29b71a1c | 1302 | |
d57d09a4 | 1303 | /* Presence of _PRW indicates wake capable */ |
952c63e9 | 1304 | if (!acpi_has_method(device->handle, "_PRW")) |
d57d09a4 RW |
1305 | return; |
1306 | ||
e88c9c60 RW |
1307 | err = acpi_bus_extract_wakeup_device_power_package(device->handle, |
1308 | &device->wakeup); | |
1309 | if (err) { | |
1310 | dev_err(&device->dev, "_PRW evaluation error: %d\n", err); | |
d57d09a4 | 1311 | return; |
9e89dde2 | 1312 | } |
1da177e4 | 1313 | |
9e89dde2 | 1314 | device->wakeup.flags.valid = 1; |
9b83ccd2 | 1315 | device->wakeup.prepare_count = 0; |
f517709d | 1316 | acpi_bus_set_run_wake_flags(device); |
729b2bdb ZY |
1317 | /* Call _PSW/_DSW object to disable its ability to wake the sleeping |
1318 | * system for the ACPI device with the _PRW object. | |
1319 | * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. | |
1320 | * So it is necessary to call _DSW object first. Only when it is not | |
1321 | * present will the _PSW object used. | |
1322 | */ | |
e88c9c60 RW |
1323 | err = acpi_device_sleep_wake(device, 0, 0, 0); |
1324 | if (err) | |
77e76609 RW |
1325 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1326 | "error in _DSW or _PSW evaluation\n")); | |
1da177e4 | 1327 | } |
1da177e4 | 1328 | |
f33ce568 RW |
1329 | static void acpi_bus_init_power_state(struct acpi_device *device, int state) |
1330 | { | |
1331 | struct acpi_device_power_state *ps = &device->power.states[state]; | |
ef85bdbe RW |
1332 | char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; |
1333 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
f33ce568 | 1334 | acpi_status status; |
bf325f95 | 1335 | |
f33ce568 RW |
1336 | INIT_LIST_HEAD(&ps->resources); |
1337 | ||
ef85bdbe RW |
1338 | /* Evaluate "_PRx" to get referenced power resources */ |
1339 | status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); | |
1340 | if (ACPI_SUCCESS(status)) { | |
1341 | union acpi_object *package = buffer.pointer; | |
1342 | ||
1343 | if (buffer.length && package | |
1344 | && package->type == ACPI_TYPE_PACKAGE | |
1345 | && package->package.count) { | |
e88c9c60 RW |
1346 | int err = acpi_extract_power_resources(package, 0, |
1347 | &ps->resources); | |
1348 | if (!err) | |
ef85bdbe | 1349 | device->power.flags.power_resources = 1; |
f33ce568 | 1350 | } |
ef85bdbe | 1351 | ACPI_FREE(buffer.pointer); |
f33ce568 RW |
1352 | } |
1353 | ||
1354 | /* Evaluate "_PSx" to see if we can do explicit sets */ | |
ef85bdbe | 1355 | pathname[2] = 'S'; |
952c63e9 | 1356 | if (acpi_has_method(device->handle, pathname)) |
f33ce568 RW |
1357 | ps->flags.explicit_set = 1; |
1358 | ||
1359 | /* | |
1360 | * State is valid if there are means to put the device into it. | |
1361 | * D3hot is only valid if _PR3 present. | |
1362 | */ | |
ef85bdbe | 1363 | if (!list_empty(&ps->resources) |
f33ce568 RW |
1364 | || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) { |
1365 | ps->flags.valid = 1; | |
1366 | ps->flags.os_accessible = 1; | |
1367 | } | |
1368 | ||
1369 | ps->power = -1; /* Unknown - driver assigned */ | |
1370 | ps->latency = -1; /* Unknown - driver assigned */ | |
1371 | } | |
1372 | ||
d43e167d | 1373 | static void acpi_bus_get_power_flags(struct acpi_device *device) |
1da177e4 | 1374 | { |
8bc5053b | 1375 | u32 i; |
1a365616 | 1376 | |
d43e167d | 1377 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ |
952c63e9 JL |
1378 | if (!acpi_has_method(device->handle, "_PS0") && |
1379 | !acpi_has_method(device->handle, "_PR0")) | |
1380 | return; | |
1a365616 | 1381 | |
d43e167d | 1382 | device->flags.power_manageable = 1; |
4be44fcd | 1383 | |
9e89dde2 ZR |
1384 | /* |
1385 | * Power Management Flags | |
1386 | */ | |
952c63e9 | 1387 | if (acpi_has_method(device->handle, "_PSC")) |
9e89dde2 | 1388 | device->power.flags.explicit_get = 1; |
952c63e9 | 1389 | if (acpi_has_method(device->handle, "_IRC")) |
9e89dde2 | 1390 | device->power.flags.inrush_current = 1; |
1da177e4 | 1391 | |
9e89dde2 ZR |
1392 | /* |
1393 | * Enumerate supported power management states | |
1394 | */ | |
f33ce568 RW |
1395 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) |
1396 | acpi_bus_init_power_state(device, i); | |
bf325f95 | 1397 | |
0b224527 | 1398 | INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); |
1da177e4 | 1399 | |
9e89dde2 ZR |
1400 | /* Set defaults for D0 and D3 states (always valid) */ |
1401 | device->power.states[ACPI_STATE_D0].flags.valid = 1; | |
1402 | device->power.states[ACPI_STATE_D0].power = 100; | |
8ad928d5 RW |
1403 | device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; |
1404 | device->power.states[ACPI_STATE_D3_COLD].power = 0; | |
c8f7a62c | 1405 | |
5c7dd710 RW |
1406 | /* Set D3cold's explicit_set flag if _PS3 exists. */ |
1407 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set) | |
1408 | device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1; | |
1409 | ||
1399dfcd AL |
1410 | /* Presence of _PS3 or _PRx means we can put the device into D3 cold */ |
1411 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set || | |
1412 | device->power.flags.power_resources) | |
1413 | device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1; | |
1414 | ||
b3785492 RW |
1415 | if (acpi_bus_init_power(device)) { |
1416 | acpi_free_power_resources_lists(device); | |
1417 | device->flags.power_manageable = 0; | |
1418 | } | |
9e89dde2 | 1419 | } |
c8f7a62c | 1420 | |
d43e167d | 1421 | static void acpi_bus_get_flags(struct acpi_device *device) |
1da177e4 | 1422 | { |
1da177e4 | 1423 | /* Presence of _STA indicates 'dynamic_status' */ |
952c63e9 | 1424 | if (acpi_has_method(device->handle, "_STA")) |
1da177e4 LT |
1425 | device->flags.dynamic_status = 1; |
1426 | ||
1da177e4 | 1427 | /* Presence of _RMV indicates 'removable' */ |
952c63e9 | 1428 | if (acpi_has_method(device->handle, "_RMV")) |
1da177e4 LT |
1429 | device->flags.removable = 1; |
1430 | ||
1431 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ | |
952c63e9 JL |
1432 | if (acpi_has_method(device->handle, "_EJD") || |
1433 | acpi_has_method(device->handle, "_EJ0")) | |
1da177e4 | 1434 | device->flags.ejectable = 1; |
1da177e4 LT |
1435 | } |
1436 | ||
c7bcb4e9 | 1437 | static void acpi_device_get_busid(struct acpi_device *device) |
1da177e4 | 1438 | { |
4be44fcd LB |
1439 | char bus_id[5] = { '?', 0 }; |
1440 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; | |
1441 | int i = 0; | |
1da177e4 LT |
1442 | |
1443 | /* | |
1444 | * Bus ID | |
1445 | * ------ | |
1446 | * The device's Bus ID is simply the object name. | |
1447 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? | |
1448 | */ | |
859ac9a4 | 1449 | if (ACPI_IS_ROOT_DEVICE(device)) { |
1da177e4 | 1450 | strcpy(device->pnp.bus_id, "ACPI"); |
859ac9a4 BH |
1451 | return; |
1452 | } | |
1453 | ||
1454 | switch (device->device_type) { | |
1da177e4 LT |
1455 | case ACPI_BUS_TYPE_POWER_BUTTON: |
1456 | strcpy(device->pnp.bus_id, "PWRF"); | |
1457 | break; | |
1458 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
1459 | strcpy(device->pnp.bus_id, "SLPF"); | |
1460 | break; | |
1461 | default: | |
66b7ed40 | 1462 | acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); |
1da177e4 LT |
1463 | /* Clean up trailing underscores (if any) */ |
1464 | for (i = 3; i > 1; i--) { | |
1465 | if (bus_id[i] == '_') | |
1466 | bus_id[i] = '\0'; | |
1467 | else | |
1468 | break; | |
1469 | } | |
1470 | strcpy(device->pnp.bus_id, bus_id); | |
1471 | break; | |
1472 | } | |
1473 | } | |
1474 | ||
ebf4df8d JL |
1475 | /* |
1476 | * acpi_ata_match - see if an acpi object is an ATA device | |
1477 | * | |
1478 | * If an acpi object has one of the ACPI ATA methods defined, | |
1479 | * then we can safely call it an ATA device. | |
1480 | */ | |
1481 | bool acpi_ata_match(acpi_handle handle) | |
1482 | { | |
1483 | return acpi_has_method(handle, "_GTF") || | |
1484 | acpi_has_method(handle, "_GTM") || | |
1485 | acpi_has_method(handle, "_STM") || | |
1486 | acpi_has_method(handle, "_SDD"); | |
1487 | } | |
1488 | ||
54735266 | 1489 | /* |
d4e1a692 | 1490 | * acpi_bay_match - see if an acpi object is an ejectable driver bay |
54735266 ZR |
1491 | * |
1492 | * If an acpi object is ejectable and has one of the ACPI ATA methods defined, | |
1493 | * then we can safely call it an ejectable drive bay | |
1494 | */ | |
ebf4df8d | 1495 | bool acpi_bay_match(acpi_handle handle) |
d4e1a692 | 1496 | { |
54735266 ZR |
1497 | acpi_handle phandle; |
1498 | ||
952c63e9 | 1499 | if (!acpi_has_method(handle, "_EJ0")) |
ebf4df8d JL |
1500 | return false; |
1501 | if (acpi_ata_match(handle)) | |
1502 | return true; | |
1503 | if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) | |
1504 | return false; | |
54735266 | 1505 | |
ebf4df8d | 1506 | return acpi_ata_match(phandle); |
54735266 ZR |
1507 | } |
1508 | ||
3620f2f2 | 1509 | /* |
d4e1a692 | 1510 | * acpi_dock_match - see if an acpi object has a _DCK method |
3620f2f2 | 1511 | */ |
ebf4df8d | 1512 | bool acpi_dock_match(acpi_handle handle) |
3620f2f2 | 1513 | { |
ebf4df8d | 1514 | return acpi_has_method(handle, "_DCK"); |
3620f2f2 FS |
1515 | } |
1516 | ||
620e112c | 1517 | const char *acpi_device_hid(struct acpi_device *device) |
15b8dd53 | 1518 | { |
7f47fa6c | 1519 | struct acpi_hardware_id *hid; |
15b8dd53 | 1520 | |
2b2ae7c7 TR |
1521 | if (list_empty(&device->pnp.ids)) |
1522 | return dummy_hid; | |
1523 | ||
7f47fa6c BH |
1524 | hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); |
1525 | return hid->id; | |
1526 | } | |
1527 | EXPORT_SYMBOL(acpi_device_hid); | |
15b8dd53 | 1528 | |
d4e1a692 | 1529 | static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) |
7f47fa6c BH |
1530 | { |
1531 | struct acpi_hardware_id *id; | |
15b8dd53 | 1532 | |
7f47fa6c BH |
1533 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
1534 | if (!id) | |
1535 | return; | |
15b8dd53 | 1536 | |
581de59e | 1537 | id->id = kstrdup(dev_id, GFP_KERNEL); |
7f47fa6c BH |
1538 | if (!id->id) { |
1539 | kfree(id); | |
1540 | return; | |
15b8dd53 BM |
1541 | } |
1542 | ||
d4e1a692 TK |
1543 | list_add_tail(&id->list, &pnp->ids); |
1544 | pnp->type.hardware_id = 1; | |
15b8dd53 BM |
1545 | } |
1546 | ||
222e82ac DW |
1547 | /* |
1548 | * Old IBM workstations have a DSDT bug wherein the SMBus object | |
1549 | * lacks the SMBUS01 HID and the methods do not have the necessary "_" | |
1550 | * prefix. Work around this. | |
1551 | */ | |
ebf4df8d | 1552 | static bool acpi_ibm_smbus_match(acpi_handle handle) |
222e82ac | 1553 | { |
ebf4df8d JL |
1554 | char node_name[ACPI_PATH_SEGMENT_LENGTH]; |
1555 | struct acpi_buffer path = { sizeof(node_name), node_name }; | |
222e82ac DW |
1556 | |
1557 | if (!dmi_name_in_vendors("IBM")) | |
ebf4df8d | 1558 | return false; |
222e82ac DW |
1559 | |
1560 | /* Look for SMBS object */ | |
ebf4df8d JL |
1561 | if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || |
1562 | strcmp("SMBS", path.pointer)) | |
1563 | return false; | |
222e82ac DW |
1564 | |
1565 | /* Does it have the necessary (but misnamed) methods? */ | |
952c63e9 JL |
1566 | if (acpi_has_method(handle, "SBI") && |
1567 | acpi_has_method(handle, "SBR") && | |
1568 | acpi_has_method(handle, "SBW")) | |
ebf4df8d JL |
1569 | return true; |
1570 | ||
1571 | return false; | |
222e82ac DW |
1572 | } |
1573 | ||
c0af4175 TK |
1574 | static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, |
1575 | int device_type) | |
1da177e4 | 1576 | { |
4be44fcd | 1577 | acpi_status status; |
57f3674f | 1578 | struct acpi_device_info *info; |
78e25fef | 1579 | struct acpi_pnp_device_id_list *cid_list; |
7f47fa6c | 1580 | int i; |
1da177e4 | 1581 | |
c0af4175 | 1582 | switch (device_type) { |
1da177e4 | 1583 | case ACPI_BUS_TYPE_DEVICE: |
c0af4175 TK |
1584 | if (handle == ACPI_ROOT_OBJECT) { |
1585 | acpi_add_id(pnp, ACPI_SYSTEM_HID); | |
859ac9a4 BH |
1586 | break; |
1587 | } | |
1588 | ||
c0af4175 | 1589 | status = acpi_get_object_info(handle, &info); |
1da177e4 | 1590 | if (ACPI_FAILURE(status)) { |
c0af4175 TK |
1591 | pr_err(PREFIX "%s: Error reading device info\n", |
1592 | __func__); | |
1da177e4 LT |
1593 | return; |
1594 | } | |
1595 | ||
1da177e4 | 1596 | if (info->valid & ACPI_VALID_HID) |
c0af4175 | 1597 | acpi_add_id(pnp, info->hardware_id.string); |
57f3674f | 1598 | if (info->valid & ACPI_VALID_CID) { |
15b8dd53 | 1599 | cid_list = &info->compatible_id_list; |
57f3674f | 1600 | for (i = 0; i < cid_list->count; i++) |
c0af4175 | 1601 | acpi_add_id(pnp, cid_list->ids[i].string); |
57f3674f | 1602 | } |
1da177e4 | 1603 | if (info->valid & ACPI_VALID_ADR) { |
c0af4175 TK |
1604 | pnp->bus_address = info->address; |
1605 | pnp->type.bus_address = 1; | |
1da177e4 | 1606 | } |
ccf78040 | 1607 | if (info->valid & ACPI_VALID_UID) |
c0af4175 | 1608 | pnp->unique_id = kstrdup(info->unique_id.string, |
ccf78040 | 1609 | GFP_KERNEL); |
ae843332 | 1610 | |
a83893ae BH |
1611 | kfree(info); |
1612 | ||
57f3674f BH |
1613 | /* |
1614 | * Some devices don't reliably have _HIDs & _CIDs, so add | |
1615 | * synthetic HIDs to make sure drivers can find them. | |
1616 | */ | |
c0af4175 TK |
1617 | if (acpi_is_video_device(handle)) |
1618 | acpi_add_id(pnp, ACPI_VIDEO_HID); | |
ebf4df8d | 1619 | else if (acpi_bay_match(handle)) |
c0af4175 | 1620 | acpi_add_id(pnp, ACPI_BAY_HID); |
ebf4df8d | 1621 | else if (acpi_dock_match(handle)) |
c0af4175 | 1622 | acpi_add_id(pnp, ACPI_DOCK_HID); |
ebf4df8d | 1623 | else if (acpi_ibm_smbus_match(handle)) |
c0af4175 TK |
1624 | acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); |
1625 | else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) { | |
1626 | acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */ | |
1627 | strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); | |
1628 | strcpy(pnp->device_class, ACPI_BUS_CLASS); | |
b7b30de5 | 1629 | } |
54735266 | 1630 | |
1da177e4 LT |
1631 | break; |
1632 | case ACPI_BUS_TYPE_POWER: | |
c0af4175 | 1633 | acpi_add_id(pnp, ACPI_POWER_HID); |
1da177e4 LT |
1634 | break; |
1635 | case ACPI_BUS_TYPE_PROCESSOR: | |
c0af4175 | 1636 | acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); |
1da177e4 | 1637 | break; |
1da177e4 | 1638 | case ACPI_BUS_TYPE_THERMAL: |
c0af4175 | 1639 | acpi_add_id(pnp, ACPI_THERMAL_HID); |
1da177e4 LT |
1640 | break; |
1641 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
c0af4175 | 1642 | acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); |
1da177e4 LT |
1643 | break; |
1644 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
c0af4175 | 1645 | acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); |
1da177e4 LT |
1646 | break; |
1647 | } | |
1da177e4 LT |
1648 | } |
1649 | ||
c0af4175 TK |
1650 | void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) |
1651 | { | |
1652 | struct acpi_hardware_id *id, *tmp; | |
1653 | ||
1654 | list_for_each_entry_safe(id, tmp, &pnp->ids, list) { | |
1655 | kfree(id->id); | |
1656 | kfree(id); | |
1657 | } | |
1658 | kfree(pnp->unique_id); | |
1659 | } | |
1660 | ||
82c7d5ef RW |
1661 | void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, |
1662 | int type, unsigned long long sta) | |
1da177e4 | 1663 | { |
d43e167d RW |
1664 | INIT_LIST_HEAD(&device->pnp.ids); |
1665 | device->device_type = type; | |
1666 | device->handle = handle; | |
1667 | device->parent = acpi_bus_get_parent(handle); | |
1668 | STRUCT_TO_INT(device->status) = sta; | |
1669 | acpi_device_get_busid(device); | |
c0af4175 | 1670 | acpi_set_pnp_ids(handle, &device->pnp, type); |
d43e167d | 1671 | acpi_bus_get_flags(device); |
2c0d4fe0 | 1672 | device->flags.match_driver = false; |
cf860be6 RW |
1673 | device_initialize(&device->dev); |
1674 | dev_set_uevent_suppress(&device->dev, true); | |
1675 | } | |
bc3b0772 | 1676 | |
cf860be6 RW |
1677 | void acpi_device_add_finalize(struct acpi_device *device) |
1678 | { | |
2c0d4fe0 | 1679 | device->flags.match_driver = true; |
cf860be6 RW |
1680 | dev_set_uevent_suppress(&device->dev, false); |
1681 | kobject_uevent(&device->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
1682 | } |
1683 | ||
5c478f49 BH |
1684 | static int acpi_add_single_object(struct acpi_device **child, |
1685 | acpi_handle handle, int type, | |
2c0d4fe0 | 1686 | unsigned long long sta) |
1da177e4 | 1687 | { |
77c24888 BH |
1688 | int result; |
1689 | struct acpi_device *device; | |
29aaefa6 | 1690 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1da177e4 | 1691 | |
36bcbec7 | 1692 | device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
1da177e4 | 1693 | if (!device) { |
6468463a | 1694 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
d550d98d | 1695 | return -ENOMEM; |
1da177e4 | 1696 | } |
1da177e4 | 1697 | |
d43e167d RW |
1698 | acpi_init_device_object(device, handle, type, sta); |
1699 | acpi_bus_get_power_flags(device); | |
d57d09a4 | 1700 | acpi_bus_get_wakeup_device_flags(device); |
1da177e4 | 1701 | |
cf860be6 | 1702 | result = acpi_device_add(device, acpi_device_release); |
d43e167d | 1703 | if (result) { |
718fb0de | 1704 | acpi_device_release(&device->dev); |
d43e167d RW |
1705 | return result; |
1706 | } | |
1da177e4 | 1707 | |
d43e167d | 1708 | acpi_power_add_remove_device(device, true); |
cf860be6 | 1709 | acpi_device_add_finalize(device); |
d43e167d RW |
1710 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
1711 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n", | |
1712 | dev_name(&device->dev), (char *) buffer.pointer, | |
1713 | device->parent ? dev_name(&device->parent->dev) : "(null)")); | |
1714 | kfree(buffer.pointer); | |
1715 | *child = device; | |
1716 | return 0; | |
bf325f95 RW |
1717 | } |
1718 | ||
778cbc1d BH |
1719 | static int acpi_bus_type_and_status(acpi_handle handle, int *type, |
1720 | unsigned long long *sta) | |
1da177e4 | 1721 | { |
778cbc1d BH |
1722 | acpi_status status; |
1723 | acpi_object_type acpi_type; | |
1da177e4 | 1724 | |
778cbc1d | 1725 | status = acpi_get_type(handle, &acpi_type); |
51a85faf | 1726 | if (ACPI_FAILURE(status)) |
778cbc1d | 1727 | return -ENODEV; |
4be44fcd | 1728 | |
778cbc1d | 1729 | switch (acpi_type) { |
51a85faf BH |
1730 | case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ |
1731 | case ACPI_TYPE_DEVICE: | |
778cbc1d BH |
1732 | *type = ACPI_BUS_TYPE_DEVICE; |
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_PROCESSOR: | |
778cbc1d BH |
1738 | *type = ACPI_BUS_TYPE_PROCESSOR; |
1739 | status = acpi_bus_get_status_handle(handle, sta); | |
1740 | if (ACPI_FAILURE(status)) | |
1741 | return -ENODEV; | |
51a85faf BH |
1742 | break; |
1743 | case ACPI_TYPE_THERMAL: | |
778cbc1d BH |
1744 | *type = ACPI_BUS_TYPE_THERMAL; |
1745 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1746 | break; |
1747 | case ACPI_TYPE_POWER: | |
778cbc1d BH |
1748 | *type = ACPI_BUS_TYPE_POWER; |
1749 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1750 | break; |
1751 | default: | |
778cbc1d | 1752 | return -ENODEV; |
51a85faf | 1753 | } |
1da177e4 | 1754 | |
778cbc1d BH |
1755 | return 0; |
1756 | } | |
1757 | ||
4b59cc1f RW |
1758 | static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, |
1759 | char *idstr, | |
1760 | const struct acpi_device_id **matchid) | |
1761 | { | |
1762 | const struct acpi_device_id *devid; | |
1763 | ||
1764 | for (devid = handler->ids; devid->id[0]; devid++) | |
1765 | if (!strcmp((char *)devid->id, idstr)) { | |
1766 | if (matchid) | |
1767 | *matchid = devid; | |
1768 | ||
1769 | return true; | |
1770 | } | |
1771 | ||
1772 | return false; | |
1773 | } | |
1774 | ||
6b772e8f TK |
1775 | static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr, |
1776 | const struct acpi_device_id **matchid) | |
1777 | { | |
1778 | struct acpi_scan_handler *handler; | |
1779 | ||
1780 | list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) | |
1781 | if (acpi_scan_handler_matching(handler, idstr, matchid)) | |
1782 | return handler; | |
1783 | ||
1784 | return NULL; | |
1785 | } | |
1786 | ||
3f8055c3 RW |
1787 | void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) |
1788 | { | |
3f8055c3 RW |
1789 | if (!!hotplug->enabled == !!val) |
1790 | return; | |
1791 | ||
1792 | mutex_lock(&acpi_scan_lock); | |
1793 | ||
1794 | hotplug->enabled = val; | |
3f8055c3 RW |
1795 | |
1796 | mutex_unlock(&acpi_scan_lock); | |
1797 | } | |
1798 | ||
6b772e8f | 1799 | static void acpi_scan_init_hotplug(acpi_handle handle, int type) |
a33ec399 | 1800 | { |
6b772e8f TK |
1801 | struct acpi_device_pnp pnp = {}; |
1802 | struct acpi_hardware_id *hwid; | |
a33ec399 RW |
1803 | struct acpi_scan_handler *handler; |
1804 | ||
6b772e8f TK |
1805 | INIT_LIST_HEAD(&pnp.ids); |
1806 | acpi_set_pnp_ids(handle, &pnp, type); | |
a33ec399 | 1807 | |
6b772e8f | 1808 | if (!pnp.type.hardware_id) |
7a26b530 | 1809 | goto out; |
a33ec399 RW |
1810 | |
1811 | /* | |
1812 | * This relies on the fact that acpi_install_notify_handler() will not | |
1813 | * install the same notify handler routine twice for the same handle. | |
1814 | */ | |
6b772e8f TK |
1815 | list_for_each_entry(hwid, &pnp.ids, list) { |
1816 | handler = acpi_scan_match_handler(hwid->id, NULL); | |
1817 | if (handler) { | |
2cbb14fb TK |
1818 | acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
1819 | acpi_hotplug_notify_cb, handler); | |
6b772e8f TK |
1820 | break; |
1821 | } | |
1822 | } | |
1823 | ||
7a26b530 | 1824 | out: |
6b772e8f | 1825 | acpi_free_pnp_ids(&pnp); |
a33ec399 RW |
1826 | } |
1827 | ||
e3863094 RW |
1828 | static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, |
1829 | void *not_used, void **return_value) | |
778cbc1d | 1830 | { |
805d410f | 1831 | struct acpi_device *device = NULL; |
778cbc1d BH |
1832 | int type; |
1833 | unsigned long long sta; | |
1834 | int result; | |
1835 | ||
4002bf38 RW |
1836 | acpi_bus_get_device(handle, &device); |
1837 | if (device) | |
1838 | goto out; | |
1839 | ||
778cbc1d BH |
1840 | result = acpi_bus_type_and_status(handle, &type, &sta); |
1841 | if (result) | |
1842 | return AE_OK; | |
1843 | ||
82c7d5ef RW |
1844 | if (type == ACPI_BUS_TYPE_POWER) { |
1845 | acpi_add_power_resource(handle); | |
1846 | return AE_OK; | |
1847 | } | |
1848 | ||
6b772e8f | 1849 | acpi_scan_init_hotplug(handle, type); |
a33ec399 | 1850 | |
778cbc1d | 1851 | if (!(sta & ACPI_STA_DEVICE_PRESENT) && |
b581a7f9 | 1852 | !(sta & ACPI_STA_DEVICE_FUNCTIONING)) { |
86e4e20e | 1853 | struct acpi_device_wakeup wakeup; |
86e4e20e | 1854 | |
952c63e9 | 1855 | if (acpi_has_method(handle, "_PRW")) { |
86e4e20e RW |
1856 | acpi_bus_extract_wakeup_device_power_package(handle, |
1857 | &wakeup); | |
993cbe59 RW |
1858 | acpi_power_resources_list_free(&wakeup.resources); |
1859 | } | |
778cbc1d | 1860 | return AE_CTRL_DEPTH; |
b581a7f9 | 1861 | } |
778cbc1d | 1862 | |
2c0d4fe0 | 1863 | acpi_add_single_object(&device, handle, type, sta); |
e3b87f8a | 1864 | if (!device) |
51a85faf | 1865 | return AE_CTRL_DEPTH; |
1da177e4 | 1866 | |
4002bf38 | 1867 | out: |
51a85faf BH |
1868 | if (!*return_value) |
1869 | *return_value = device; | |
805d410f | 1870 | |
51a85faf BH |
1871 | return AE_OK; |
1872 | } | |
3fb02738 | 1873 | |
c5698074 | 1874 | static int acpi_scan_attach_handler(struct acpi_device *device) |
ca589f94 | 1875 | { |
c5698074 RW |
1876 | struct acpi_hardware_id *hwid; |
1877 | int ret = 0; | |
ca589f94 | 1878 | |
c5698074 | 1879 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
87b85b3c | 1880 | const struct acpi_device_id *devid; |
c5698074 | 1881 | struct acpi_scan_handler *handler; |
ca589f94 | 1882 | |
c5698074 RW |
1883 | handler = acpi_scan_match_handler(hwid->id, &devid); |
1884 | if (handler) { | |
87b85b3c RW |
1885 | ret = handler->attach(device, devid); |
1886 | if (ret > 0) { | |
1887 | device->handler = handler; | |
c5698074 | 1888 | break; |
87b85b3c | 1889 | } else if (ret < 0) { |
c5698074 | 1890 | break; |
87b85b3c | 1891 | } |
ca589f94 RW |
1892 | } |
1893 | } | |
1894 | return ret; | |
1895 | } | |
1896 | ||
0fc300b0 RW |
1897 | static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used, |
1898 | void *not_used, void **ret_not_used) | |
51a85faf | 1899 | { |
805d410f RW |
1900 | struct acpi_device *device; |
1901 | unsigned long long sta_not_used; | |
ca589f94 | 1902 | int ret; |
3fb02738 | 1903 | |
805d410f RW |
1904 | /* |
1905 | * Ignore errors ignored by acpi_bus_check_add() to avoid terminating | |
1906 | * namespace walks prematurely. | |
1907 | */ | |
ca589f94 | 1908 | if (acpi_bus_type_and_status(handle, &ret, &sta_not_used)) |
805d410f | 1909 | return AE_OK; |
1da177e4 | 1910 | |
805d410f RW |
1911 | if (acpi_bus_get_device(handle, &device)) |
1912 | return AE_CTRL_DEPTH; | |
7779688f | 1913 | |
3a391a39 RW |
1914 | if (device->handler) |
1915 | return AE_OK; | |
1916 | ||
ca589f94 RW |
1917 | ret = acpi_scan_attach_handler(device); |
1918 | if (ret) | |
1919 | return ret > 0 ? AE_OK : AE_CTRL_DEPTH; | |
1920 | ||
1921 | ret = device_attach(&device->dev); | |
1922 | return ret >= 0 ? AE_OK : AE_CTRL_DEPTH; | |
1da177e4 | 1923 | } |
1da177e4 | 1924 | |
636458de | 1925 | /** |
b8bd759a | 1926 | * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. |
636458de | 1927 | * @handle: Root of the namespace scope to scan. |
7779688f | 1928 | * |
636458de RW |
1929 | * Scan a given ACPI tree (probably recently hot-plugged) and create and add |
1930 | * found devices. | |
7779688f | 1931 | * |
636458de RW |
1932 | * If no devices were found, -ENODEV is returned, but it does not mean that |
1933 | * there has been a real error. There just have been no suitable ACPI objects | |
1934 | * in the table trunk from which the kernel could create a device and add an | |
1935 | * appropriate driver. | |
3757b948 RW |
1936 | * |
1937 | * Must be called under acpi_scan_lock. | |
7779688f | 1938 | */ |
b8bd759a | 1939 | int acpi_bus_scan(acpi_handle handle) |
3fb02738 | 1940 | { |
b8bd759a | 1941 | void *device = NULL; |
c511cc19 | 1942 | int error = 0; |
3fb02738 | 1943 | |
b8bd759a RW |
1944 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device))) |
1945 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
1946 | acpi_bus_check_add, NULL, NULL, &device); | |
3fb02738 | 1947 | |
d2f6650a | 1948 | if (!device) |
c511cc19 RW |
1949 | error = -ENODEV; |
1950 | else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL))) | |
b8bd759a RW |
1951 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
1952 | acpi_bus_device_attach, NULL, NULL, NULL); | |
3fb02738 | 1953 | |
c511cc19 | 1954 | return error; |
3fb02738 | 1955 | } |
b8bd759a | 1956 | EXPORT_SYMBOL(acpi_bus_scan); |
a2100801 | 1957 | |
05404d8f RW |
1958 | static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used, |
1959 | void *not_used, void **ret_not_used) | |
1960 | { | |
1961 | struct acpi_device *device = NULL; | |
a2100801 | 1962 | |
05404d8f | 1963 | if (!acpi_bus_get_device(handle, &device)) { |
ca589f94 RW |
1964 | struct acpi_scan_handler *dev_handler = device->handler; |
1965 | ||
ca589f94 RW |
1966 | if (dev_handler) { |
1967 | if (dev_handler->detach) | |
1968 | dev_handler->detach(device); | |
1969 | ||
1970 | device->handler = NULL; | |
1971 | } else { | |
1972 | device_release_driver(&device->dev); | |
1973 | } | |
05404d8f RW |
1974 | } |
1975 | return AE_OK; | |
3fb02738 | 1976 | } |
1da177e4 | 1977 | |
05404d8f RW |
1978 | static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used, |
1979 | void *not_used, void **ret_not_used) | |
1da177e4 | 1980 | { |
05404d8f | 1981 | struct acpi_device *device = NULL; |
4be44fcd | 1982 | |
05404d8f RW |
1983 | if (!acpi_bus_get_device(handle, &device)) |
1984 | acpi_device_unregister(device); | |
1da177e4 | 1985 | |
05404d8f RW |
1986 | return AE_OK; |
1987 | } | |
1da177e4 | 1988 | |
3757b948 RW |
1989 | /** |
1990 | * acpi_bus_trim - Remove ACPI device node and all of its descendants | |
1991 | * @start: Root of the ACPI device nodes subtree to remove. | |
1992 | * | |
1993 | * Must be called under acpi_scan_lock. | |
1994 | */ | |
bfee26db | 1995 | void acpi_bus_trim(struct acpi_device *start) |
1da177e4 | 1996 | { |
05404d8f RW |
1997 | /* |
1998 | * Execute acpi_bus_device_detach() as a post-order callback to detach | |
1999 | * all ACPI drivers from the device nodes being removed. | |
2000 | */ | |
2001 | acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL, | |
2002 | acpi_bus_device_detach, NULL, NULL); | |
2003 | acpi_bus_device_detach(start->handle, 0, NULL, NULL); | |
cecdb193 RW |
2004 | /* |
2005 | * Execute acpi_bus_remove() as a post-order callback to remove device | |
2006 | * nodes in the given namespace scope. | |
2007 | */ | |
2008 | acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL, | |
2009 | acpi_bus_remove, NULL, NULL); | |
2010 | acpi_bus_remove(start->handle, 0, NULL, NULL); | |
1da177e4 | 2011 | } |
ceaba663 KA |
2012 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
2013 | ||
e8b945c9 | 2014 | static int acpi_bus_scan_fixed(void) |
1da177e4 | 2015 | { |
4be44fcd | 2016 | int result = 0; |
c4168bff | 2017 | |
1da177e4 LT |
2018 | /* |
2019 | * Enumerate all fixed-feature devices. | |
2020 | */ | |
2c0d4fe0 RW |
2021 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { |
2022 | struct acpi_device *device = NULL; | |
2023 | ||
5c478f49 | 2024 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2025 | ACPI_BUS_TYPE_POWER_BUTTON, |
2c0d4fe0 RW |
2026 | ACPI_STA_DEFAULT); |
2027 | if (result) | |
2028 | return result; | |
2029 | ||
2030 | result = device_attach(&device->dev); | |
2031 | if (result < 0) | |
2032 | return result; | |
2033 | ||
c10d7a13 | 2034 | device_init_wakeup(&device->dev, true); |
3fb02738 | 2035 | } |
1da177e4 | 2036 | |
2c0d4fe0 RW |
2037 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { |
2038 | struct acpi_device *device = NULL; | |
2039 | ||
5c478f49 | 2040 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2041 | ACPI_BUS_TYPE_SLEEP_BUTTON, |
2c0d4fe0 RW |
2042 | ACPI_STA_DEFAULT); |
2043 | if (result) | |
2044 | return result; | |
2045 | ||
2046 | result = device_attach(&device->dev); | |
3fb02738 | 2047 | } |
1da177e4 | 2048 | |
2c0d4fe0 | 2049 | return result < 0 ? result : 0; |
1da177e4 LT |
2050 | } |
2051 | ||
e747f274 | 2052 | int __init acpi_scan_init(void) |
1da177e4 LT |
2053 | { |
2054 | int result; | |
1da177e4 | 2055 | |
5b327265 PM |
2056 | result = bus_register(&acpi_bus_type); |
2057 | if (result) { | |
2058 | /* We don't want to quit even if we failed to add suspend/resume */ | |
2059 | printk(KERN_ERR PREFIX "Could not register bus type\n"); | |
2060 | } | |
2061 | ||
92ef2a25 | 2062 | acpi_pci_root_init(); |
4daeaf68 | 2063 | acpi_pci_link_init(); |
ac212b69 | 2064 | acpi_processor_init(); |
141a297b | 2065 | acpi_platform_init(); |
f58b082a | 2066 | acpi_lpss_init(); |
2fa97feb | 2067 | acpi_cmos_rtc_init(); |
737f1a9f | 2068 | acpi_container_init(); |
0a347644 | 2069 | acpi_memory_hotplug_init(); |
94add0f8 | 2070 | acpi_dock_init(); |
97d9a9e9 | 2071 | |
3757b948 | 2072 | mutex_lock(&acpi_scan_lock); |
1da177e4 LT |
2073 | /* |
2074 | * Enumerate devices in the ACPI namespace. | |
2075 | */ | |
0cd6ac52 RW |
2076 | result = acpi_bus_scan(ACPI_ROOT_OBJECT); |
2077 | if (result) | |
3757b948 | 2078 | goto out; |
1da177e4 | 2079 | |
0cd6ac52 | 2080 | result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); |
1da177e4 | 2081 | if (result) |
3757b948 | 2082 | goto out; |
1da177e4 | 2083 | |
b8bd759a RW |
2084 | result = acpi_bus_scan_fixed(); |
2085 | if (result) { | |
b17b537a | 2086 | acpi_device_unregister(acpi_root); |
3757b948 | 2087 | goto out; |
b8bd759a | 2088 | } |
1da177e4 | 2089 | |
b8bd759a | 2090 | acpi_update_all_gpes(); |
3757b948 | 2091 | |
668192b6 YL |
2092 | acpi_pci_root_hp_init(); |
2093 | ||
3757b948 RW |
2094 | out: |
2095 | mutex_unlock(&acpi_scan_lock); | |
2096 | return result; | |
1da177e4 | 2097 | } |