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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * scan.c - support for transforming the ACPI namespace into individual objects | |
3 | */ | |
4 | ||
5 | #include <linux/module.h> | |
6 | #include <linux/init.h> | |
5a0e3ad6 | 7 | #include <linux/slab.h> |
9b6d97b6 | 8 | #include <linux/kernel.h> |
1da177e4 | 9 | #include <linux/acpi.h> |
74523c90 AK |
10 | #include <linux/signal.h> |
11 | #include <linux/kthread.h> | |
222e82ac | 12 | #include <linux/dmi.h> |
d1efe3c3 | 13 | #include <linux/nls.h> |
1da177e4 LT |
14 | |
15 | #include <acpi/acpi_drivers.h> | |
1da177e4 | 16 | |
d783156e RW |
17 | #include <asm/pgtable.h> |
18 | ||
e60cc7a6 BH |
19 | #include "internal.h" |
20 | ||
1da177e4 | 21 | #define _COMPONENT ACPI_BUS_COMPONENT |
f52fd66d | 22 | ACPI_MODULE_NAME("scan"); |
1da177e4 | 23 | #define STRUCT_TO_INT(s) (*((int*)&s)) |
4be44fcd | 24 | extern struct acpi_device *acpi_root; |
1da177e4 LT |
25 | |
26 | #define ACPI_BUS_CLASS "system_bus" | |
29b71a1c | 27 | #define ACPI_BUS_HID "LNXSYBUS" |
1da177e4 LT |
28 | #define ACPI_BUS_DEVICE_NAME "System Bus" |
29 | ||
859ac9a4 BH |
30 | #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent) |
31 | ||
d783156e RW |
32 | #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page) |
33 | ||
683058e3 RW |
34 | /* |
35 | * If set, devices will be hot-removed even if they cannot be put offline | |
36 | * gracefully (from the kernel's standpoint). | |
37 | */ | |
38 | bool acpi_force_hot_remove; | |
39 | ||
620e112c | 40 | static const char *dummy_hid = "device"; |
2b2ae7c7 | 41 | |
e49bd2dd | 42 | static LIST_HEAD(acpi_bus_id_list); |
c511cc19 | 43 | static DEFINE_MUTEX(acpi_scan_lock); |
ca589f94 | 44 | static LIST_HEAD(acpi_scan_handlers_list); |
9090589d | 45 | DEFINE_MUTEX(acpi_device_lock); |
1da177e4 LT |
46 | LIST_HEAD(acpi_wakeup_device_list); |
47 | ||
e49bd2dd | 48 | struct acpi_device_bus_id{ |
bb095854 | 49 | char bus_id[15]; |
e49bd2dd ZR |
50 | unsigned int instance_no; |
51 | struct list_head node; | |
1da177e4 | 52 | }; |
29b71a1c | 53 | |
3757b948 RW |
54 | void acpi_scan_lock_acquire(void) |
55 | { | |
56 | mutex_lock(&acpi_scan_lock); | |
57 | } | |
58 | EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire); | |
59 | ||
60 | void acpi_scan_lock_release(void) | |
61 | { | |
62 | mutex_unlock(&acpi_scan_lock); | |
63 | } | |
64 | EXPORT_SYMBOL_GPL(acpi_scan_lock_release); | |
65 | ||
ca589f94 RW |
66 | int acpi_scan_add_handler(struct acpi_scan_handler *handler) |
67 | { | |
68 | if (!handler || !handler->attach) | |
69 | return -EINVAL; | |
70 | ||
71 | list_add_tail(&handler->list_node, &acpi_scan_handlers_list); | |
72 | return 0; | |
73 | } | |
74 | ||
3f8055c3 RW |
75 | int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler, |
76 | const char *hotplug_profile_name) | |
77 | { | |
78 | int error; | |
79 | ||
80 | error = acpi_scan_add_handler(handler); | |
81 | if (error) | |
82 | return error; | |
83 | ||
84 | acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name); | |
85 | return 0; | |
86 | } | |
87 | ||
29b71a1c TR |
88 | /* |
89 | * Creates hid/cid(s) string needed for modalias and uevent | |
90 | * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: | |
91 | * char *modalias: "acpi:IBM0001:ACPI0001" | |
92 | */ | |
b3e572d2 AB |
93 | static int create_modalias(struct acpi_device *acpi_dev, char *modalias, |
94 | int size) | |
95 | { | |
29b71a1c | 96 | int len; |
5c9fcb5d | 97 | int count; |
7f47fa6c | 98 | struct acpi_hardware_id *id; |
29b71a1c | 99 | |
2b2ae7c7 TR |
100 | if (list_empty(&acpi_dev->pnp.ids)) |
101 | return 0; | |
102 | ||
5c9fcb5d | 103 | len = snprintf(modalias, size, "acpi:"); |
29b71a1c TR |
104 | size -= len; |
105 | ||
7f47fa6c BH |
106 | list_for_each_entry(id, &acpi_dev->pnp.ids, list) { |
107 | count = snprintf(&modalias[len], size, "%s:", id->id); | |
5c9fcb5d ZR |
108 | if (count < 0 || count >= size) |
109 | return -EINVAL; | |
110 | len += count; | |
111 | size -= count; | |
112 | } | |
113 | ||
29b71a1c TR |
114 | modalias[len] = '\0'; |
115 | return len; | |
116 | } | |
117 | ||
118 | static ssize_t | |
119 | acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
120 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
121 | int len; | |
122 | ||
123 | /* Device has no HID and no CID or string is >1024 */ | |
124 | len = create_modalias(acpi_dev, buf, 1024); | |
125 | if (len <= 0) | |
126 | return 0; | |
127 | buf[len++] = '\n'; | |
128 | return len; | |
129 | } | |
130 | static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); | |
131 | ||
7f28ddec RW |
132 | static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data, |
133 | void **ret_p) | |
683058e3 RW |
134 | { |
135 | struct acpi_device *device = NULL; | |
136 | struct acpi_device_physical_node *pn; | |
303bfdb1 | 137 | bool second_pass = (bool)data; |
683058e3 RW |
138 | acpi_status status = AE_OK; |
139 | ||
140 | if (acpi_bus_get_device(handle, &device)) | |
141 | return AE_OK; | |
142 | ||
7f28ddec RW |
143 | if (device->handler && !device->handler->hotplug.enabled) { |
144 | *ret_p = &device->dev; | |
145 | return AE_SUPPORT; | |
146 | } | |
147 | ||
683058e3 RW |
148 | mutex_lock(&device->physical_node_lock); |
149 | ||
150 | list_for_each_entry(pn, &device->physical_node_list, node) { | |
151 | int ret; | |
152 | ||
303bfdb1 RW |
153 | if (second_pass) { |
154 | /* Skip devices offlined by the first pass. */ | |
155 | if (pn->put_online) | |
156 | continue; | |
157 | } else { | |
158 | pn->put_online = false; | |
159 | } | |
683058e3 RW |
160 | ret = device_offline(pn->dev); |
161 | if (acpi_force_hot_remove) | |
162 | continue; | |
163 | ||
303bfdb1 RW |
164 | if (ret >= 0) { |
165 | pn->put_online = !ret; | |
166 | } else { | |
167 | *ret_p = pn->dev; | |
168 | if (second_pass) { | |
169 | status = AE_ERROR; | |
170 | break; | |
171 | } | |
683058e3 | 172 | } |
683058e3 RW |
173 | } |
174 | ||
175 | mutex_unlock(&device->physical_node_lock); | |
176 | ||
177 | return status; | |
178 | } | |
179 | ||
7f28ddec RW |
180 | static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data, |
181 | void **ret_p) | |
683058e3 RW |
182 | { |
183 | struct acpi_device *device = NULL; | |
184 | struct acpi_device_physical_node *pn; | |
185 | ||
186 | if (acpi_bus_get_device(handle, &device)) | |
187 | return AE_OK; | |
188 | ||
189 | mutex_lock(&device->physical_node_lock); | |
190 | ||
191 | list_for_each_entry(pn, &device->physical_node_list, node) | |
192 | if (pn->put_online) { | |
193 | device_online(pn->dev); | |
194 | pn->put_online = false; | |
195 | } | |
196 | ||
197 | mutex_unlock(&device->physical_node_lock); | |
198 | ||
199 | return AE_OK; | |
200 | } | |
201 | ||
a33ec399 | 202 | static int acpi_scan_hot_remove(struct acpi_device *device) |
1da177e4 | 203 | { |
5993c467 | 204 | acpi_handle handle = device->handle; |
303bfdb1 | 205 | struct device *errdev; |
a33ec399 | 206 | acpi_status status; |
882fd12e | 207 | unsigned long long sta; |
f058cdf4 | 208 | |
303bfdb1 RW |
209 | /* |
210 | * Carry out two passes here and ignore errors in the first pass, | |
211 | * because if the devices in question are memory blocks and | |
212 | * CONFIG_MEMCG is set, one of the blocks may hold data structures | |
213 | * that the other blocks depend on, but it is not known in advance which | |
214 | * block holds them. | |
215 | * | |
216 | * If the first pass is successful, the second one isn't needed, though. | |
217 | */ | |
218 | errdev = NULL; | |
7f28ddec RW |
219 | status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
220 | NULL, acpi_bus_offline, (void *)false, | |
221 | (void **)&errdev); | |
222 | if (status == AE_SUPPORT) { | |
223 | dev_warn(errdev, "Offline disabled.\n"); | |
224 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
225 | acpi_bus_online, NULL, NULL, NULL); | |
7f28ddec RW |
226 | return -EPERM; |
227 | } | |
228 | acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev); | |
303bfdb1 RW |
229 | if (errdev) { |
230 | errdev = NULL; | |
683058e3 | 231 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
7f28ddec RW |
232 | NULL, acpi_bus_offline, (void *)true, |
233 | (void **)&errdev); | |
303bfdb1 | 234 | if (!errdev || acpi_force_hot_remove) |
7f28ddec RW |
235 | acpi_bus_offline(handle, 0, (void *)true, |
236 | (void **)&errdev); | |
303bfdb1 RW |
237 | |
238 | if (errdev && !acpi_force_hot_remove) { | |
239 | dev_warn(errdev, "Offline failed.\n"); | |
7f28ddec | 240 | acpi_bus_online(handle, 0, NULL, NULL); |
303bfdb1 | 241 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, |
7f28ddec RW |
242 | ACPI_UINT32_MAX, acpi_bus_online, |
243 | NULL, NULL, NULL); | |
303bfdb1 RW |
244 | return -EBUSY; |
245 | } | |
683058e3 RW |
246 | } |
247 | ||
26d46867 | 248 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
0794469d | 249 | "Hot-removing device %s...\n", dev_name(&device->dev))); |
26d46867 | 250 | |
bfee26db | 251 | acpi_bus_trim(device); |
683058e3 | 252 | |
7d2421f8 | 253 | acpi_evaluate_lck(handle, 0); |
1da177e4 LT |
254 | /* |
255 | * TBD: _EJD support. | |
256 | */ | |
7d2421f8 JL |
257 | status = acpi_evaluate_ej0(handle); |
258 | if (status == AE_NOT_FOUND) | |
259 | return -ENODEV; | |
260 | else if (ACPI_FAILURE(status)) | |
261 | return -EIO; | |
1da177e4 | 262 | |
882fd12e TK |
263 | /* |
264 | * Verify if eject was indeed successful. If not, log an error | |
265 | * message. No need to call _OST since _EJ0 call was made OK. | |
266 | */ | |
267 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
268 | if (ACPI_FAILURE(status)) { | |
269 | acpi_handle_warn(handle, | |
270 | "Status check after eject failed (0x%x)\n", status); | |
271 | } else if (sta & ACPI_STA_DEVICE_ENABLED) { | |
272 | acpi_handle_warn(handle, | |
273 | "Eject incomplete - status 0x%llx\n", sta); | |
274 | } | |
275 | ||
a33ec399 RW |
276 | return 0; |
277 | } | |
1da177e4 | 278 | |
c27b2c33 | 279 | static int acpi_scan_device_check(struct acpi_device *adev) |
a33ec399 | 280 | { |
f943db40 | 281 | int error; |
a33ec399 | 282 | |
c27b2c33 RW |
283 | error = acpi_bus_scan(adev->handle); |
284 | if (error) { | |
285 | dev_warn(&adev->dev, "Namespace scan failure\n"); | |
286 | return error; | |
287 | } | |
46394fd0 | 288 | if (!adev->handler) { |
c27b2c33 RW |
289 | dev_warn(&adev->dev, "Enumeration failure\n"); |
290 | return -ENODEV; | |
291 | } | |
292 | return 0; | |
a33ec399 RW |
293 | } |
294 | ||
3338db00 | 295 | static void acpi_device_hotplug(void *data, u32 src) |
a33ec399 | 296 | { |
a33ec399 | 297 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
c27b2c33 | 298 | struct acpi_device *adev = data; |
3338db00 | 299 | struct acpi_scan_handler *handler; |
a33ec399 RW |
300 | int error; |
301 | ||
683058e3 | 302 | lock_device_hotplug(); |
e0ae8fee | 303 | mutex_lock(&acpi_scan_lock); |
a33ec399 | 304 | |
c27b2c33 RW |
305 | /* |
306 | * The device object's ACPI handle cannot become invalid as long as we | |
307 | * are holding acpi_scan_lock, but it may have become invalid before | |
308 | * that lock was acquired. | |
309 | */ | |
310 | if (adev->handle == INVALID_ACPI_HANDLE) | |
a33ec399 | 311 | goto out; |
c27b2c33 | 312 | |
3338db00 RW |
313 | handler = adev->handler; |
314 | ||
c27b2c33 RW |
315 | switch (src) { |
316 | case ACPI_NOTIFY_BUS_CHECK: | |
3338db00 RW |
317 | if (handler) { |
318 | error = handler->hotplug.scan_dependent ? | |
319 | handler->hotplug.scan_dependent(adev) : | |
320 | acpi_bus_scan(adev->handle); | |
321 | } else { | |
322 | error = acpi_scan_device_check(adev); | |
323 | } | |
c27b2c33 RW |
324 | break; |
325 | case ACPI_NOTIFY_DEVICE_CHECK: | |
3338db00 RW |
326 | /* |
327 | * This code is only run for device objects for which matching | |
328 | * scan handlers exist. The only situation in which the scan | |
329 | * handler is not attached to this device object yet is when the | |
330 | * device has just appeared (either it wasn't present at all | |
331 | * before or it was removed and then added again). | |
332 | */ | |
333 | if (adev->handler) { | |
334 | dev_warn(&adev->dev, "Already enumerated\n"); | |
335 | error = -EBUSY; | |
336 | } else { | |
337 | error = acpi_scan_device_check(adev); | |
338 | } | |
c27b2c33 RW |
339 | break; |
340 | case ACPI_NOTIFY_EJECT_REQUEST: | |
341 | case ACPI_OST_EC_OSPM_EJECT: | |
342 | error = acpi_scan_hot_remove(adev); | |
343 | break; | |
344 | default: | |
345 | error = -EINVAL; | |
346 | break; | |
a33ec399 | 347 | } |
c27b2c33 RW |
348 | if (!error) |
349 | ost_code = ACPI_OST_SC_SUCCESS; | |
a33ec399 RW |
350 | |
351 | out: | |
c27b2c33 RW |
352 | acpi_evaluate_hotplug_ost(adev->handle, src, ost_code, NULL); |
353 | put_device(&adev->dev); | |
a33ec399 | 354 | mutex_unlock(&acpi_scan_lock); |
e0ae8fee | 355 | unlock_device_hotplug(); |
a33ec399 RW |
356 | } |
357 | ||
2cbb14fb | 358 | static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) |
a33ec399 | 359 | { |
1ceaba05 | 360 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
2cbb14fb | 361 | struct acpi_scan_handler *handler = data; |
a3b1b1ef | 362 | struct acpi_device *adev; |
a33ec399 RW |
363 | acpi_status status; |
364 | ||
c27b2c33 RW |
365 | if (acpi_bus_get_device(handle, &adev)) |
366 | goto err_out; | |
367 | ||
a33ec399 RW |
368 | switch (type) { |
369 | case ACPI_NOTIFY_BUS_CHECK: | |
370 | acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); | |
a33ec399 RW |
371 | break; |
372 | case ACPI_NOTIFY_DEVICE_CHECK: | |
373 | acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); | |
a33ec399 RW |
374 | break; |
375 | case ACPI_NOTIFY_EJECT_REQUEST: | |
376 | acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); | |
1ceaba05 RW |
377 | if (!handler->hotplug.enabled) { |
378 | acpi_handle_err(handle, "Eject disabled\n"); | |
379 | ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; | |
380 | goto err_out; | |
381 | } | |
c27b2c33 RW |
382 | acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, |
383 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); | |
384 | break; | |
a33ec399 RW |
385 | default: |
386 | /* non-hotplug event; possibly handled by other handler */ | |
387 | return; | |
388 | } | |
c27b2c33 RW |
389 | get_device(&adev->dev); |
390 | status = acpi_hotplug_execute(acpi_device_hotplug, adev, type); | |
a3b1b1ef RW |
391 | if (ACPI_SUCCESS(status)) |
392 | return; | |
a33ec399 | 393 | |
c27b2c33 RW |
394 | put_device(&adev->dev); |
395 | ||
a3b1b1ef | 396 | err_out: |
1ceaba05 | 397 | acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); |
1da177e4 LT |
398 | } |
399 | ||
836aedb1 RW |
400 | static ssize_t real_power_state_show(struct device *dev, |
401 | struct device_attribute *attr, char *buf) | |
402 | { | |
403 | struct acpi_device *adev = to_acpi_device(dev); | |
404 | int state; | |
405 | int ret; | |
406 | ||
407 | ret = acpi_device_get_power(adev, &state); | |
408 | if (ret) | |
409 | return ret; | |
410 | ||
411 | return sprintf(buf, "%s\n", acpi_power_state_string(state)); | |
412 | } | |
413 | ||
414 | static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL); | |
415 | ||
416 | static ssize_t power_state_show(struct device *dev, | |
417 | struct device_attribute *attr, char *buf) | |
418 | { | |
419 | struct acpi_device *adev = to_acpi_device(dev); | |
420 | ||
421 | return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state)); | |
422 | } | |
423 | ||
424 | static DEVICE_ATTR(power_state, 0444, power_state_show, NULL); | |
425 | ||
1da177e4 | 426 | static ssize_t |
f883d9db PM |
427 | acpi_eject_store(struct device *d, struct device_attribute *attr, |
428 | const char *buf, size_t count) | |
1da177e4 | 429 | { |
f883d9db | 430 | struct acpi_device *acpi_device = to_acpi_device(d); |
a33ec399 RW |
431 | acpi_object_type not_used; |
432 | acpi_status status; | |
1da177e4 | 433 | |
a33ec399 | 434 | if (!count || buf[0] != '1') |
1da177e4 | 435 | return -EINVAL; |
1da177e4 | 436 | |
a33ec399 RW |
437 | if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled) |
438 | && !acpi_device->driver) | |
439 | return -ENODEV; | |
440 | ||
441 | status = acpi_get_type(acpi_device->handle, ¬_used); | |
442 | if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable) | |
443 | return -ENODEV; | |
444 | ||
f943db40 | 445 | acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, |
a33ec399 | 446 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); |
a33ec399 | 447 | get_device(&acpi_device->dev); |
c27b2c33 | 448 | status = acpi_hotplug_execute(acpi_device_hotplug, acpi_device, |
7b98118a | 449 | ACPI_OST_EC_OSPM_EJECT); |
f943db40 RW |
450 | if (ACPI_SUCCESS(status)) |
451 | return count; | |
a33ec399 | 452 | |
f943db40 | 453 | put_device(&acpi_device->dev); |
f943db40 | 454 | acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, |
a33ec399 | 455 | ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); |
5add99cf | 456 | return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN; |
1da177e4 LT |
457 | } |
458 | ||
f883d9db | 459 | static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); |
1da177e4 | 460 | |
e49bd2dd ZR |
461 | static ssize_t |
462 | acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
463 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
1da177e4 | 464 | |
ea8d82fd | 465 | return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev)); |
1da177e4 | 466 | } |
e49bd2dd | 467 | static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); |
1da177e4 | 468 | |
923d4a45 LZ |
469 | static ssize_t acpi_device_uid_show(struct device *dev, |
470 | struct device_attribute *attr, char *buf) | |
471 | { | |
472 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
473 | ||
474 | return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id); | |
475 | } | |
476 | static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL); | |
477 | ||
478 | static ssize_t acpi_device_adr_show(struct device *dev, | |
479 | struct device_attribute *attr, char *buf) | |
480 | { | |
481 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
482 | ||
483 | return sprintf(buf, "0x%08x\n", | |
484 | (unsigned int)(acpi_dev->pnp.bus_address)); | |
485 | } | |
486 | static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL); | |
487 | ||
e49bd2dd ZR |
488 | static ssize_t |
489 | acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
490 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
491 | struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; | |
492 | int result; | |
1da177e4 | 493 | |
e49bd2dd | 494 | result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); |
0c526d96 | 495 | if (result) |
e49bd2dd | 496 | goto end; |
1da177e4 | 497 | |
e49bd2dd ZR |
498 | result = sprintf(buf, "%s\n", (char*)path.pointer); |
499 | kfree(path.pointer); | |
0c526d96 | 500 | end: |
e49bd2dd | 501 | return result; |
1da177e4 | 502 | } |
e49bd2dd | 503 | static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); |
1da177e4 | 504 | |
d1efe3c3 LO |
505 | /* sysfs file that shows description text from the ACPI _STR method */ |
506 | static ssize_t description_show(struct device *dev, | |
507 | struct device_attribute *attr, | |
508 | char *buf) { | |
509 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
510 | int result; | |
511 | ||
512 | if (acpi_dev->pnp.str_obj == NULL) | |
513 | return 0; | |
514 | ||
515 | /* | |
516 | * The _STR object contains a Unicode identifier for a device. | |
517 | * We need to convert to utf-8 so it can be displayed. | |
518 | */ | |
519 | result = utf16s_to_utf8s( | |
520 | (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer, | |
521 | acpi_dev->pnp.str_obj->buffer.length, | |
522 | UTF16_LITTLE_ENDIAN, buf, | |
523 | PAGE_SIZE); | |
524 | ||
525 | buf[result++] = '\n'; | |
526 | ||
527 | return result; | |
528 | } | |
529 | static DEVICE_ATTR(description, 0444, description_show, NULL); | |
530 | ||
bb74ac23 YI |
531 | static ssize_t |
532 | acpi_device_sun_show(struct device *dev, struct device_attribute *attr, | |
533 | char *buf) { | |
534 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
535 | ||
536 | return sprintf(buf, "%lu\n", acpi_dev->pnp.sun); | |
537 | } | |
538 | static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL); | |
539 | ||
e49bd2dd | 540 | static int acpi_device_setup_files(struct acpi_device *dev) |
1da177e4 | 541 | { |
d1efe3c3 | 542 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
f883d9db | 543 | acpi_status status; |
bb74ac23 | 544 | unsigned long long sun; |
e49bd2dd | 545 | int result = 0; |
1da177e4 LT |
546 | |
547 | /* | |
e49bd2dd | 548 | * Devices gotten from FADT don't have a "path" attribute |
1da177e4 | 549 | */ |
0c526d96 | 550 | if (dev->handle) { |
e49bd2dd | 551 | result = device_create_file(&dev->dev, &dev_attr_path); |
0c526d96 | 552 | if (result) |
e49bd2dd | 553 | goto end; |
1da177e4 LT |
554 | } |
555 | ||
2b2ae7c7 TR |
556 | if (!list_empty(&dev->pnp.ids)) { |
557 | result = device_create_file(&dev->dev, &dev_attr_hid); | |
558 | if (result) | |
559 | goto end; | |
1da177e4 | 560 | |
2b2ae7c7 TR |
561 | result = device_create_file(&dev->dev, &dev_attr_modalias); |
562 | if (result) | |
563 | goto end; | |
564 | } | |
29b71a1c | 565 | |
d1efe3c3 LO |
566 | /* |
567 | * If device has _STR, 'description' file is created | |
568 | */ | |
952c63e9 | 569 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
570 | status = acpi_evaluate_object(dev->handle, "_STR", |
571 | NULL, &buffer); | |
572 | if (ACPI_FAILURE(status)) | |
573 | buffer.pointer = NULL; | |
574 | dev->pnp.str_obj = buffer.pointer; | |
575 | result = device_create_file(&dev->dev, &dev_attr_description); | |
576 | if (result) | |
577 | goto end; | |
578 | } | |
579 | ||
d4e1a692 | 580 | if (dev->pnp.type.bus_address) |
923d4a45 LZ |
581 | result = device_create_file(&dev->dev, &dev_attr_adr); |
582 | if (dev->pnp.unique_id) | |
583 | result = device_create_file(&dev->dev, &dev_attr_uid); | |
584 | ||
bb74ac23 YI |
585 | status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun); |
586 | if (ACPI_SUCCESS(status)) { | |
587 | dev->pnp.sun = (unsigned long)sun; | |
588 | result = device_create_file(&dev->dev, &dev_attr_sun); | |
589 | if (result) | |
590 | goto end; | |
591 | } else { | |
592 | dev->pnp.sun = (unsigned long)-1; | |
593 | } | |
594 | ||
e49bd2dd ZR |
595 | /* |
596 | * If device has _EJ0, 'eject' file is created that is used to trigger | |
597 | * hot-removal function from userland. | |
598 | */ | |
952c63e9 | 599 | if (acpi_has_method(dev->handle, "_EJ0")) { |
e49bd2dd | 600 | result = device_create_file(&dev->dev, &dev_attr_eject); |
836aedb1 RW |
601 | if (result) |
602 | return result; | |
603 | } | |
604 | ||
605 | if (dev->flags.power_manageable) { | |
606 | result = device_create_file(&dev->dev, &dev_attr_power_state); | |
607 | if (result) | |
608 | return result; | |
609 | ||
610 | if (dev->power.flags.power_resources) | |
611 | result = device_create_file(&dev->dev, | |
612 | &dev_attr_real_power_state); | |
613 | } | |
614 | ||
0c526d96 | 615 | end: |
e49bd2dd | 616 | return result; |
1da177e4 LT |
617 | } |
618 | ||
f883d9db | 619 | static void acpi_device_remove_files(struct acpi_device *dev) |
1da177e4 | 620 | { |
836aedb1 RW |
621 | if (dev->flags.power_manageable) { |
622 | device_remove_file(&dev->dev, &dev_attr_power_state); | |
623 | if (dev->power.flags.power_resources) | |
624 | device_remove_file(&dev->dev, | |
625 | &dev_attr_real_power_state); | |
626 | } | |
627 | ||
f883d9db | 628 | /* |
d1efe3c3 LO |
629 | * If device has _STR, remove 'description' file |
630 | */ | |
952c63e9 | 631 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
632 | kfree(dev->pnp.str_obj); |
633 | device_remove_file(&dev->dev, &dev_attr_description); | |
634 | } | |
635 | /* | |
636 | * If device has _EJ0, remove 'eject' file. | |
f883d9db | 637 | */ |
952c63e9 | 638 | if (acpi_has_method(dev->handle, "_EJ0")) |
f883d9db | 639 | device_remove_file(&dev->dev, &dev_attr_eject); |
1da177e4 | 640 | |
952c63e9 | 641 | if (acpi_has_method(dev->handle, "_SUN")) |
bb74ac23 YI |
642 | device_remove_file(&dev->dev, &dev_attr_sun); |
643 | ||
923d4a45 LZ |
644 | if (dev->pnp.unique_id) |
645 | device_remove_file(&dev->dev, &dev_attr_uid); | |
d4e1a692 | 646 | if (dev->pnp.type.bus_address) |
923d4a45 | 647 | device_remove_file(&dev->dev, &dev_attr_adr); |
1131b938 BH |
648 | device_remove_file(&dev->dev, &dev_attr_modalias); |
649 | device_remove_file(&dev->dev, &dev_attr_hid); | |
0c526d96 | 650 | if (dev->handle) |
e49bd2dd | 651 | device_remove_file(&dev->dev, &dev_attr_path); |
1da177e4 | 652 | } |
1da177e4 | 653 | /* -------------------------------------------------------------------------- |
9e89dde2 | 654 | ACPI Bus operations |
1da177e4 | 655 | -------------------------------------------------------------------------- */ |
29b71a1c | 656 | |
cf761af9 MW |
657 | static const struct acpi_device_id *__acpi_match_device( |
658 | struct acpi_device *device, const struct acpi_device_id *ids) | |
29b71a1c TR |
659 | { |
660 | const struct acpi_device_id *id; | |
7f47fa6c | 661 | struct acpi_hardware_id *hwid; |
29b71a1c | 662 | |
39a0ad87 ZY |
663 | /* |
664 | * If the device is not present, it is unnecessary to load device | |
665 | * driver for it. | |
666 | */ | |
667 | if (!device->status.present) | |
cf761af9 | 668 | return NULL; |
39a0ad87 | 669 | |
7f47fa6c BH |
670 | for (id = ids; id->id[0]; id++) |
671 | list_for_each_entry(hwid, &device->pnp.ids, list) | |
672 | if (!strcmp((char *) id->id, hwid->id)) | |
cf761af9 MW |
673 | return id; |
674 | ||
675 | return NULL; | |
676 | } | |
677 | ||
678 | /** | |
679 | * acpi_match_device - Match a struct device against a given list of ACPI IDs | |
680 | * @ids: Array of struct acpi_device_id object to match against. | |
681 | * @dev: The device structure to match. | |
682 | * | |
683 | * Check if @dev has a valid ACPI handle and if there is a struct acpi_device | |
684 | * object for that handle and use that object to match against a given list of | |
685 | * device IDs. | |
686 | * | |
687 | * Return a pointer to the first matching ID on success or %NULL on failure. | |
688 | */ | |
689 | const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, | |
690 | const struct device *dev) | |
691 | { | |
692 | struct acpi_device *adev; | |
0613e1f7 | 693 | acpi_handle handle = ACPI_HANDLE(dev); |
cf761af9 | 694 | |
0613e1f7 | 695 | if (!ids || !handle || acpi_bus_get_device(handle, &adev)) |
cf761af9 MW |
696 | return NULL; |
697 | ||
698 | return __acpi_match_device(adev, ids); | |
699 | } | |
700 | EXPORT_SYMBOL_GPL(acpi_match_device); | |
29b71a1c | 701 | |
cf761af9 MW |
702 | int acpi_match_device_ids(struct acpi_device *device, |
703 | const struct acpi_device_id *ids) | |
704 | { | |
705 | return __acpi_match_device(device, ids) ? 0 : -ENOENT; | |
29b71a1c TR |
706 | } |
707 | EXPORT_SYMBOL(acpi_match_device_ids); | |
708 | ||
0b224527 RW |
709 | static void acpi_free_power_resources_lists(struct acpi_device *device) |
710 | { | |
711 | int i; | |
712 | ||
993cbe59 RW |
713 | if (device->wakeup.flags.valid) |
714 | acpi_power_resources_list_free(&device->wakeup.resources); | |
715 | ||
0b224527 RW |
716 | if (!device->flags.power_manageable) |
717 | return; | |
718 | ||
719 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { | |
720 | struct acpi_device_power_state *ps = &device->power.states[i]; | |
721 | acpi_power_resources_list_free(&ps->resources); | |
722 | } | |
7f47fa6c BH |
723 | } |
724 | ||
1890a97a | 725 | static void acpi_device_release(struct device *dev) |
1da177e4 | 726 | { |
1890a97a | 727 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1da177e4 | 728 | |
c0af4175 | 729 | acpi_free_pnp_ids(&acpi_dev->pnp); |
0b224527 | 730 | acpi_free_power_resources_lists(acpi_dev); |
1890a97a | 731 | kfree(acpi_dev); |
1da177e4 LT |
732 | } |
733 | ||
5d9464a4 | 734 | static int acpi_bus_match(struct device *dev, struct device_driver *drv) |
9e89dde2 | 735 | { |
5d9464a4 PM |
736 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
737 | struct acpi_driver *acpi_drv = to_acpi_driver(drv); | |
1da177e4 | 738 | |
209d3b17 | 739 | return acpi_dev->flags.match_driver |
805d410f | 740 | && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); |
5d9464a4 | 741 | } |
1da177e4 | 742 | |
7eff2e7a | 743 | static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 | 744 | { |
5d9464a4 | 745 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
7eff2e7a | 746 | int len; |
5d9464a4 | 747 | |
2b2ae7c7 TR |
748 | if (list_empty(&acpi_dev->pnp.ids)) |
749 | return 0; | |
750 | ||
7eff2e7a KS |
751 | if (add_uevent_var(env, "MODALIAS=")) |
752 | return -ENOMEM; | |
753 | len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], | |
754 | sizeof(env->buf) - env->buflen); | |
755 | if (len >= (sizeof(env->buf) - env->buflen)) | |
756 | return -ENOMEM; | |
757 | env->buflen += len; | |
9e89dde2 | 758 | return 0; |
1da177e4 LT |
759 | } |
760 | ||
46ec8598 BH |
761 | static void acpi_device_notify(acpi_handle handle, u32 event, void *data) |
762 | { | |
763 | struct acpi_device *device = data; | |
764 | ||
765 | device->driver->ops.notify(device, event); | |
766 | } | |
767 | ||
768 | static acpi_status acpi_device_notify_fixed(void *data) | |
769 | { | |
770 | struct acpi_device *device = data; | |
771 | ||
53de5356 BH |
772 | /* Fixed hardware devices have no handles */ |
773 | acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); | |
46ec8598 BH |
774 | return AE_OK; |
775 | } | |
776 | ||
777 | static int acpi_device_install_notify_handler(struct acpi_device *device) | |
778 | { | |
779 | acpi_status status; | |
46ec8598 | 780 | |
ccba2a36 | 781 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 BH |
782 | status = |
783 | acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, | |
784 | acpi_device_notify_fixed, | |
785 | device); | |
ccba2a36 | 786 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 BH |
787 | status = |
788 | acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, | |
789 | acpi_device_notify_fixed, | |
790 | device); | |
791 | else | |
792 | status = acpi_install_notify_handler(device->handle, | |
793 | ACPI_DEVICE_NOTIFY, | |
794 | acpi_device_notify, | |
795 | device); | |
796 | ||
797 | if (ACPI_FAILURE(status)) | |
798 | return -EINVAL; | |
799 | return 0; | |
800 | } | |
801 | ||
802 | static void acpi_device_remove_notify_handler(struct acpi_device *device) | |
803 | { | |
ccba2a36 | 804 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 BH |
805 | acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
806 | acpi_device_notify_fixed); | |
ccba2a36 | 807 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 BH |
808 | acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, |
809 | acpi_device_notify_fixed); | |
810 | else | |
811 | acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, | |
812 | acpi_device_notify); | |
813 | } | |
814 | ||
d9e455f5 | 815 | static int acpi_device_probe(struct device *dev) |
1da177e4 | 816 | { |
5d9464a4 PM |
817 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
818 | struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); | |
819 | int ret; | |
820 | ||
24071f47 RW |
821 | if (acpi_dev->handler) |
822 | return -EINVAL; | |
823 | ||
d9e455f5 RW |
824 | if (!acpi_drv->ops.add) |
825 | return -ENOSYS; | |
46ec8598 | 826 | |
d9e455f5 RW |
827 | ret = acpi_drv->ops.add(acpi_dev); |
828 | if (ret) | |
829 | return ret; | |
46ec8598 | 830 | |
d9e455f5 RW |
831 | acpi_dev->driver = acpi_drv; |
832 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
833 | "Driver [%s] successfully bound to device [%s]\n", | |
834 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
835 | ||
836 | if (acpi_drv->ops.notify) { | |
837 | ret = acpi_device_install_notify_handler(acpi_dev); | |
838 | if (ret) { | |
839 | if (acpi_drv->ops.remove) | |
840 | acpi_drv->ops.remove(acpi_dev); | |
841 | ||
842 | acpi_dev->driver = NULL; | |
843 | acpi_dev->driver_data = NULL; | |
844 | return ret; | |
845 | } | |
5d9464a4 | 846 | } |
d9e455f5 RW |
847 | |
848 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", | |
849 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
850 | get_device(dev); | |
851 | return 0; | |
5d9464a4 | 852 | } |
1da177e4 | 853 | |
5d9464a4 PM |
854 | static int acpi_device_remove(struct device * dev) |
855 | { | |
856 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
857 | struct acpi_driver *acpi_drv = acpi_dev->driver; | |
858 | ||
859 | if (acpi_drv) { | |
46ec8598 BH |
860 | if (acpi_drv->ops.notify) |
861 | acpi_device_remove_notify_handler(acpi_dev); | |
5d9464a4 | 862 | if (acpi_drv->ops.remove) |
51fac838 | 863 | acpi_drv->ops.remove(acpi_dev); |
1da177e4 | 864 | } |
5d9464a4 | 865 | acpi_dev->driver = NULL; |
db89b4f0 | 866 | acpi_dev->driver_data = NULL; |
1da177e4 | 867 | |
5d9464a4 | 868 | put_device(dev); |
9e89dde2 ZR |
869 | return 0; |
870 | } | |
1da177e4 | 871 | |
55955aad | 872 | struct bus_type acpi_bus_type = { |
9e89dde2 | 873 | .name = "acpi", |
5d9464a4 PM |
874 | .match = acpi_bus_match, |
875 | .probe = acpi_device_probe, | |
876 | .remove = acpi_device_remove, | |
877 | .uevent = acpi_device_uevent, | |
9e89dde2 ZR |
878 | }; |
879 | ||
d783156e RW |
880 | static void acpi_device_del(struct acpi_device *device) |
881 | { | |
882 | mutex_lock(&acpi_device_lock); | |
883 | if (device->parent) | |
884 | list_del(&device->node); | |
885 | ||
886 | list_del(&device->wakeup_list); | |
887 | mutex_unlock(&acpi_device_lock); | |
888 | ||
889 | acpi_power_add_remove_device(device, false); | |
890 | acpi_device_remove_files(device); | |
891 | if (device->remove) | |
892 | device->remove(device); | |
893 | ||
894 | device_del(&device->dev); | |
895 | } | |
896 | ||
897 | static LIST_HEAD(acpi_device_del_list); | |
898 | static DEFINE_MUTEX(acpi_device_del_lock); | |
899 | ||
900 | static void acpi_device_del_work_fn(struct work_struct *work_not_used) | |
901 | { | |
902 | for (;;) { | |
903 | struct acpi_device *adev; | |
904 | ||
905 | mutex_lock(&acpi_device_del_lock); | |
906 | ||
907 | if (list_empty(&acpi_device_del_list)) { | |
908 | mutex_unlock(&acpi_device_del_lock); | |
909 | break; | |
910 | } | |
911 | adev = list_first_entry(&acpi_device_del_list, | |
912 | struct acpi_device, del_list); | |
913 | list_del(&adev->del_list); | |
914 | ||
915 | mutex_unlock(&acpi_device_del_lock); | |
916 | ||
917 | acpi_device_del(adev); | |
918 | /* | |
919 | * Drop references to all power resources that might have been | |
920 | * used by the device. | |
921 | */ | |
922 | acpi_power_transition(adev, ACPI_STATE_D3_COLD); | |
923 | put_device(&adev->dev); | |
924 | } | |
925 | } | |
926 | ||
927 | /** | |
928 | * acpi_scan_drop_device - Drop an ACPI device object. | |
929 | * @handle: Handle of an ACPI namespace node, not used. | |
930 | * @context: Address of the ACPI device object to drop. | |
931 | * | |
932 | * This is invoked by acpi_ns_delete_node() during the removal of the ACPI | |
933 | * namespace node the device object pointed to by @context is attached to. | |
934 | * | |
935 | * The unregistration is carried out asynchronously to avoid running | |
936 | * acpi_device_del() under the ACPICA's namespace mutex and the list is used to | |
937 | * ensure the correct ordering (the device objects must be unregistered in the | |
938 | * same order in which the corresponding namespace nodes are deleted). | |
939 | */ | |
940 | static void acpi_scan_drop_device(acpi_handle handle, void *context) | |
caf5c03f | 941 | { |
d783156e RW |
942 | static DECLARE_WORK(work, acpi_device_del_work_fn); |
943 | struct acpi_device *adev = context; | |
944 | ||
945 | mutex_lock(&acpi_device_del_lock); | |
946 | ||
947 | /* | |
948 | * Use the ACPI hotplug workqueue which is ordered, so this work item | |
949 | * won't run after any hotplug work items submitted subsequently. That | |
950 | * prevents attempts to register device objects identical to those being | |
951 | * deleted from happening concurrently (such attempts result from | |
952 | * hotplug events handled via the ACPI hotplug workqueue). It also will | |
953 | * run after all of the work items submitted previosuly, which helps | |
954 | * those work items to ensure that they are not accessing stale device | |
955 | * objects. | |
956 | */ | |
957 | if (list_empty(&acpi_device_del_list)) | |
958 | acpi_queue_hotplug_work(&work); | |
959 | ||
960 | list_add_tail(&adev->del_list, &acpi_device_del_list); | |
961 | /* Make acpi_ns_validate_handle() return NULL for this handle. */ | |
962 | adev->handle = INVALID_ACPI_HANDLE; | |
963 | ||
964 | mutex_unlock(&acpi_device_del_lock); | |
caf5c03f RW |
965 | } |
966 | ||
967 | int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) | |
968 | { | |
969 | acpi_status status; | |
970 | ||
971 | if (!device) | |
972 | return -EINVAL; | |
973 | ||
d783156e | 974 | status = acpi_get_data(handle, acpi_scan_drop_device, (void **)device); |
caf5c03f RW |
975 | if (ACPI_FAILURE(status) || !*device) { |
976 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", | |
977 | handle)); | |
978 | return -ENODEV; | |
979 | } | |
980 | return 0; | |
981 | } | |
6585925b | 982 | EXPORT_SYMBOL(acpi_bus_get_device); |
caf5c03f | 983 | |
cf860be6 RW |
984 | int acpi_device_add(struct acpi_device *device, |
985 | void (*release)(struct device *)) | |
1da177e4 | 986 | { |
4be44fcd | 987 | int result; |
e49bd2dd ZR |
988 | struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; |
989 | int found = 0; | |
66b7ed40 | 990 | |
d43e167d RW |
991 | if (device->handle) { |
992 | acpi_status status; | |
993 | ||
d783156e | 994 | status = acpi_attach_data(device->handle, acpi_scan_drop_device, |
d43e167d RW |
995 | device); |
996 | if (ACPI_FAILURE(status)) { | |
997 | acpi_handle_err(device->handle, | |
998 | "Unable to attach device data\n"); | |
999 | return -ENODEV; | |
1000 | } | |
1001 | } | |
1002 | ||
9e89dde2 ZR |
1003 | /* |
1004 | * Linkage | |
1005 | * ------- | |
1006 | * Link this device to its parent and siblings. | |
1007 | */ | |
1008 | INIT_LIST_HEAD(&device->children); | |
1009 | INIT_LIST_HEAD(&device->node); | |
9e89dde2 | 1010 | INIT_LIST_HEAD(&device->wakeup_list); |
1033f904 | 1011 | INIT_LIST_HEAD(&device->physical_node_list); |
d783156e | 1012 | INIT_LIST_HEAD(&device->del_list); |
1033f904 | 1013 | mutex_init(&device->physical_node_lock); |
1da177e4 | 1014 | |
e49bd2dd ZR |
1015 | new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); |
1016 | if (!new_bus_id) { | |
d43e167d RW |
1017 | pr_err(PREFIX "Memory allocation error\n"); |
1018 | result = -ENOMEM; | |
1019 | goto err_detach; | |
1da177e4 | 1020 | } |
e49bd2dd | 1021 | |
9090589d | 1022 | mutex_lock(&acpi_device_lock); |
e49bd2dd ZR |
1023 | /* |
1024 | * Find suitable bus_id and instance number in acpi_bus_id_list | |
1025 | * If failed, create one and link it into acpi_bus_id_list | |
1026 | */ | |
1027 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { | |
1131b938 BH |
1028 | if (!strcmp(acpi_device_bus_id->bus_id, |
1029 | acpi_device_hid(device))) { | |
1030 | acpi_device_bus_id->instance_no++; | |
e49bd2dd ZR |
1031 | found = 1; |
1032 | kfree(new_bus_id); | |
1033 | break; | |
1034 | } | |
1da177e4 | 1035 | } |
0c526d96 | 1036 | if (!found) { |
e49bd2dd | 1037 | acpi_device_bus_id = new_bus_id; |
1131b938 | 1038 | strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); |
e49bd2dd ZR |
1039 | acpi_device_bus_id->instance_no = 0; |
1040 | list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); | |
1da177e4 | 1041 | } |
0794469d | 1042 | dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); |
1da177e4 | 1043 | |
33b57150 | 1044 | if (device->parent) |
9e89dde2 | 1045 | list_add_tail(&device->node, &device->parent->children); |
33b57150 | 1046 | |
9e89dde2 ZR |
1047 | if (device->wakeup.flags.valid) |
1048 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); | |
9090589d | 1049 | mutex_unlock(&acpi_device_lock); |
1da177e4 | 1050 | |
1890a97a | 1051 | if (device->parent) |
66b7ed40 | 1052 | device->dev.parent = &device->parent->dev; |
1890a97a | 1053 | device->dev.bus = &acpi_bus_type; |
82c7d5ef | 1054 | device->dev.release = release; |
cf860be6 | 1055 | result = device_add(&device->dev); |
0c526d96 | 1056 | if (result) { |
8b12b922 | 1057 | dev_err(&device->dev, "Error registering device\n"); |
d43e167d | 1058 | goto err; |
1da177e4 | 1059 | } |
1da177e4 | 1060 | |
e49bd2dd | 1061 | result = acpi_device_setup_files(device); |
0c526d96 | 1062 | if (result) |
0794469d KS |
1063 | printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", |
1064 | dev_name(&device->dev)); | |
1da177e4 | 1065 | |
1da177e4 | 1066 | return 0; |
d43e167d RW |
1067 | |
1068 | err: | |
9090589d | 1069 | mutex_lock(&acpi_device_lock); |
33b57150 | 1070 | if (device->parent) |
e49bd2dd | 1071 | list_del(&device->node); |
e49bd2dd | 1072 | list_del(&device->wakeup_list); |
9090589d | 1073 | mutex_unlock(&acpi_device_lock); |
d43e167d RW |
1074 | |
1075 | err_detach: | |
d783156e | 1076 | acpi_detach_data(device->handle, acpi_scan_drop_device); |
e49bd2dd | 1077 | return result; |
1da177e4 LT |
1078 | } |
1079 | ||
9e89dde2 ZR |
1080 | /* -------------------------------------------------------------------------- |
1081 | Driver Management | |
1082 | -------------------------------------------------------------------------- */ | |
9e89dde2 ZR |
1083 | /** |
1084 | * acpi_bus_register_driver - register a driver with the ACPI bus | |
1085 | * @driver: driver being registered | |
1086 | * | |
1087 | * Registers a driver with the ACPI bus. Searches the namespace for all | |
1088 | * devices that match the driver's criteria and binds. Returns zero for | |
1089 | * success or a negative error status for failure. | |
1090 | */ | |
1091 | int acpi_bus_register_driver(struct acpi_driver *driver) | |
1da177e4 | 1092 | { |
1890a97a | 1093 | int ret; |
1da177e4 | 1094 | |
9e89dde2 ZR |
1095 | if (acpi_disabled) |
1096 | return -ENODEV; | |
1890a97a PM |
1097 | driver->drv.name = driver->name; |
1098 | driver->drv.bus = &acpi_bus_type; | |
1099 | driver->drv.owner = driver->owner; | |
1da177e4 | 1100 | |
1890a97a PM |
1101 | ret = driver_register(&driver->drv); |
1102 | return ret; | |
9e89dde2 | 1103 | } |
1da177e4 | 1104 | |
9e89dde2 ZR |
1105 | EXPORT_SYMBOL(acpi_bus_register_driver); |
1106 | ||
1107 | /** | |
b27b14ce | 1108 | * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus |
9e89dde2 ZR |
1109 | * @driver: driver to unregister |
1110 | * | |
1111 | * Unregisters a driver with the ACPI bus. Searches the namespace for all | |
1112 | * devices that match the driver's criteria and unbinds. | |
1113 | */ | |
1114 | void acpi_bus_unregister_driver(struct acpi_driver *driver) | |
1115 | { | |
1890a97a | 1116 | driver_unregister(&driver->drv); |
9e89dde2 ZR |
1117 | } |
1118 | ||
1119 | EXPORT_SYMBOL(acpi_bus_unregister_driver); | |
1120 | ||
9e89dde2 ZR |
1121 | /* -------------------------------------------------------------------------- |
1122 | Device Enumeration | |
1123 | -------------------------------------------------------------------------- */ | |
5c478f49 BH |
1124 | static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) |
1125 | { | |
456de893 | 1126 | struct acpi_device *device = NULL; |
5c478f49 | 1127 | acpi_status status; |
5c478f49 BH |
1128 | |
1129 | /* | |
1130 | * Fixed hardware devices do not appear in the namespace and do not | |
1131 | * have handles, but we fabricate acpi_devices for them, so we have | |
1132 | * to deal with them specially. | |
1133 | */ | |
456de893 | 1134 | if (!handle) |
5c478f49 BH |
1135 | return acpi_root; |
1136 | ||
1137 | do { | |
1138 | status = acpi_get_parent(handle, &handle); | |
5c478f49 | 1139 | if (ACPI_FAILURE(status)) |
456de893 RW |
1140 | return status == AE_NULL_ENTRY ? NULL : acpi_root; |
1141 | } while (acpi_bus_get_device(handle, &device)); | |
1142 | return device; | |
5c478f49 BH |
1143 | } |
1144 | ||
9e89dde2 ZR |
1145 | acpi_status |
1146 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) | |
1147 | { | |
1148 | acpi_status status; | |
1149 | acpi_handle tmp; | |
1150 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
1151 | union acpi_object *obj; | |
1152 | ||
1153 | status = acpi_get_handle(handle, "_EJD", &tmp); | |
1154 | if (ACPI_FAILURE(status)) | |
1155 | return status; | |
1156 | ||
1157 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); | |
1158 | if (ACPI_SUCCESS(status)) { | |
1159 | obj = buffer.pointer; | |
3b5fee59 HM |
1160 | status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, |
1161 | ejd); | |
9e89dde2 ZR |
1162 | kfree(buffer.pointer); |
1163 | } | |
1164 | return status; | |
1165 | } | |
1166 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); | |
1167 | ||
e88c9c60 RW |
1168 | static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle, |
1169 | struct acpi_device_wakeup *wakeup) | |
9e89dde2 | 1170 | { |
b581a7f9 RW |
1171 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1172 | union acpi_object *package = NULL; | |
9e89dde2 | 1173 | union acpi_object *element = NULL; |
b581a7f9 | 1174 | acpi_status status; |
e88c9c60 | 1175 | int err = -ENODATA; |
9e89dde2 | 1176 | |
b581a7f9 | 1177 | if (!wakeup) |
e88c9c60 | 1178 | return -EINVAL; |
9e89dde2 | 1179 | |
993cbe59 | 1180 | INIT_LIST_HEAD(&wakeup->resources); |
9e89dde2 | 1181 | |
b581a7f9 RW |
1182 | /* _PRW */ |
1183 | status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); | |
1184 | if (ACPI_FAILURE(status)) { | |
1185 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); | |
e88c9c60 | 1186 | return err; |
b581a7f9 RW |
1187 | } |
1188 | ||
1189 | package = (union acpi_object *)buffer.pointer; | |
1190 | ||
e88c9c60 | 1191 | if (!package || package->package.count < 2) |
b581a7f9 | 1192 | goto out; |
b581a7f9 | 1193 | |
9e89dde2 | 1194 | element = &(package->package.elements[0]); |
e88c9c60 | 1195 | if (!element) |
b581a7f9 | 1196 | goto out; |
e88c9c60 | 1197 | |
9e89dde2 ZR |
1198 | if (element->type == ACPI_TYPE_PACKAGE) { |
1199 | if ((element->package.count < 2) || | |
1200 | (element->package.elements[0].type != | |
1201 | ACPI_TYPE_LOCAL_REFERENCE) | |
e88c9c60 | 1202 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
b581a7f9 | 1203 | goto out; |
e88c9c60 | 1204 | |
b581a7f9 | 1205 | wakeup->gpe_device = |
9e89dde2 | 1206 | element->package.elements[0].reference.handle; |
b581a7f9 | 1207 | wakeup->gpe_number = |
9e89dde2 ZR |
1208 | (u32) element->package.elements[1].integer.value; |
1209 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
b581a7f9 RW |
1210 | wakeup->gpe_device = NULL; |
1211 | wakeup->gpe_number = element->integer.value; | |
1212 | } else { | |
b581a7f9 RW |
1213 | goto out; |
1214 | } | |
9e89dde2 ZR |
1215 | |
1216 | element = &(package->package.elements[1]); | |
e88c9c60 | 1217 | if (element->type != ACPI_TYPE_INTEGER) |
b581a7f9 | 1218 | goto out; |
e88c9c60 | 1219 | |
b581a7f9 | 1220 | wakeup->sleep_state = element->integer.value; |
9e89dde2 | 1221 | |
e88c9c60 RW |
1222 | err = acpi_extract_power_resources(package, 2, &wakeup->resources); |
1223 | if (err) | |
b581a7f9 | 1224 | goto out; |
9e89dde2 | 1225 | |
0596a52b RW |
1226 | if (!list_empty(&wakeup->resources)) { |
1227 | int sleep_state; | |
9e89dde2 | 1228 | |
b5d667eb RW |
1229 | err = acpi_power_wakeup_list_init(&wakeup->resources, |
1230 | &sleep_state); | |
1231 | if (err) { | |
1232 | acpi_handle_warn(handle, "Retrieving current states " | |
1233 | "of wakeup power resources failed\n"); | |
1234 | acpi_power_resources_list_free(&wakeup->resources); | |
1235 | goto out; | |
1236 | } | |
0596a52b RW |
1237 | if (sleep_state < wakeup->sleep_state) { |
1238 | acpi_handle_warn(handle, "Overriding _PRW sleep state " | |
1239 | "(S%d) by S%d from power resources\n", | |
1240 | (int)wakeup->sleep_state, sleep_state); | |
1241 | wakeup->sleep_state = sleep_state; | |
1242 | } | |
1243 | } | |
bba63a29 | 1244 | acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number); |
9874647b | 1245 | |
b581a7f9 RW |
1246 | out: |
1247 | kfree(buffer.pointer); | |
e88c9c60 | 1248 | return err; |
1da177e4 LT |
1249 | } |
1250 | ||
f517709d | 1251 | static void acpi_bus_set_run_wake_flags(struct acpi_device *device) |
1da177e4 | 1252 | { |
29b71a1c | 1253 | struct acpi_device_id button_device_ids[] = { |
29b71a1c | 1254 | {"PNP0C0C", 0}, |
b7e38304 | 1255 | {"PNP0C0D", 0}, |
29b71a1c TR |
1256 | {"PNP0C0E", 0}, |
1257 | {"", 0}, | |
1258 | }; | |
f517709d RW |
1259 | acpi_status status; |
1260 | acpi_event_status event_status; | |
1261 | ||
b67ea761 | 1262 | device->wakeup.flags.notifier_present = 0; |
f517709d RW |
1263 | |
1264 | /* Power button, Lid switch always enable wakeup */ | |
1265 | if (!acpi_match_device_ids(device, button_device_ids)) { | |
1266 | device->wakeup.flags.run_wake = 1; | |
b7e38304 ZR |
1267 | if (!acpi_match_device_ids(device, &button_device_ids[1])) { |
1268 | /* Do not use Lid/sleep button for S5 wakeup */ | |
1269 | if (device->wakeup.sleep_state == ACPI_STATE_S5) | |
1270 | device->wakeup.sleep_state = ACPI_STATE_S4; | |
1271 | } | |
f2b56bc8 | 1272 | device_set_wakeup_capable(&device->dev, true); |
f517709d RW |
1273 | return; |
1274 | } | |
1275 | ||
e8e18c95 RW |
1276 | status = acpi_get_gpe_status(device->wakeup.gpe_device, |
1277 | device->wakeup.gpe_number, | |
1278 | &event_status); | |
f517709d RW |
1279 | if (status == AE_OK) |
1280 | device->wakeup.flags.run_wake = | |
1281 | !!(event_status & ACPI_EVENT_FLAG_HANDLE); | |
1282 | } | |
1283 | ||
d57d09a4 | 1284 | static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
f517709d | 1285 | { |
e88c9c60 | 1286 | int err; |
29b71a1c | 1287 | |
d57d09a4 | 1288 | /* Presence of _PRW indicates wake capable */ |
952c63e9 | 1289 | if (!acpi_has_method(device->handle, "_PRW")) |
d57d09a4 RW |
1290 | return; |
1291 | ||
e88c9c60 RW |
1292 | err = acpi_bus_extract_wakeup_device_power_package(device->handle, |
1293 | &device->wakeup); | |
1294 | if (err) { | |
1295 | dev_err(&device->dev, "_PRW evaluation error: %d\n", err); | |
d57d09a4 | 1296 | return; |
9e89dde2 | 1297 | } |
1da177e4 | 1298 | |
9e89dde2 | 1299 | device->wakeup.flags.valid = 1; |
9b83ccd2 | 1300 | device->wakeup.prepare_count = 0; |
f517709d | 1301 | acpi_bus_set_run_wake_flags(device); |
729b2bdb ZY |
1302 | /* Call _PSW/_DSW object to disable its ability to wake the sleeping |
1303 | * system for the ACPI device with the _PRW object. | |
1304 | * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. | |
1305 | * So it is necessary to call _DSW object first. Only when it is not | |
1306 | * present will the _PSW object used. | |
1307 | */ | |
e88c9c60 RW |
1308 | err = acpi_device_sleep_wake(device, 0, 0, 0); |
1309 | if (err) | |
77e76609 RW |
1310 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1311 | "error in _DSW or _PSW evaluation\n")); | |
1da177e4 | 1312 | } |
1da177e4 | 1313 | |
f33ce568 RW |
1314 | static void acpi_bus_init_power_state(struct acpi_device *device, int state) |
1315 | { | |
1316 | struct acpi_device_power_state *ps = &device->power.states[state]; | |
ef85bdbe RW |
1317 | char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; |
1318 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
f33ce568 | 1319 | acpi_status status; |
bf325f95 | 1320 | |
f33ce568 RW |
1321 | INIT_LIST_HEAD(&ps->resources); |
1322 | ||
ef85bdbe RW |
1323 | /* Evaluate "_PRx" to get referenced power resources */ |
1324 | status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); | |
1325 | if (ACPI_SUCCESS(status)) { | |
1326 | union acpi_object *package = buffer.pointer; | |
1327 | ||
1328 | if (buffer.length && package | |
1329 | && package->type == ACPI_TYPE_PACKAGE | |
1330 | && package->package.count) { | |
e88c9c60 RW |
1331 | int err = acpi_extract_power_resources(package, 0, |
1332 | &ps->resources); | |
1333 | if (!err) | |
ef85bdbe | 1334 | device->power.flags.power_resources = 1; |
f33ce568 | 1335 | } |
ef85bdbe | 1336 | ACPI_FREE(buffer.pointer); |
f33ce568 RW |
1337 | } |
1338 | ||
1339 | /* Evaluate "_PSx" to see if we can do explicit sets */ | |
ef85bdbe | 1340 | pathname[2] = 'S'; |
952c63e9 | 1341 | if (acpi_has_method(device->handle, pathname)) |
f33ce568 RW |
1342 | ps->flags.explicit_set = 1; |
1343 | ||
1344 | /* | |
1345 | * State is valid if there are means to put the device into it. | |
1346 | * D3hot is only valid if _PR3 present. | |
1347 | */ | |
ef85bdbe | 1348 | if (!list_empty(&ps->resources) |
f33ce568 RW |
1349 | || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) { |
1350 | ps->flags.valid = 1; | |
1351 | ps->flags.os_accessible = 1; | |
1352 | } | |
1353 | ||
1354 | ps->power = -1; /* Unknown - driver assigned */ | |
1355 | ps->latency = -1; /* Unknown - driver assigned */ | |
1356 | } | |
1357 | ||
d43e167d | 1358 | static void acpi_bus_get_power_flags(struct acpi_device *device) |
1da177e4 | 1359 | { |
8bc5053b | 1360 | u32 i; |
1a365616 | 1361 | |
d43e167d | 1362 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ |
952c63e9 JL |
1363 | if (!acpi_has_method(device->handle, "_PS0") && |
1364 | !acpi_has_method(device->handle, "_PR0")) | |
1365 | return; | |
1a365616 | 1366 | |
d43e167d | 1367 | device->flags.power_manageable = 1; |
4be44fcd | 1368 | |
9e89dde2 ZR |
1369 | /* |
1370 | * Power Management Flags | |
1371 | */ | |
952c63e9 | 1372 | if (acpi_has_method(device->handle, "_PSC")) |
9e89dde2 | 1373 | device->power.flags.explicit_get = 1; |
952c63e9 | 1374 | if (acpi_has_method(device->handle, "_IRC")) |
9e89dde2 | 1375 | device->power.flags.inrush_current = 1; |
1da177e4 | 1376 | |
9e89dde2 ZR |
1377 | /* |
1378 | * Enumerate supported power management states | |
1379 | */ | |
f33ce568 RW |
1380 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) |
1381 | acpi_bus_init_power_state(device, i); | |
bf325f95 | 1382 | |
0b224527 | 1383 | INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); |
1da177e4 | 1384 | |
9e89dde2 ZR |
1385 | /* Set defaults for D0 and D3 states (always valid) */ |
1386 | device->power.states[ACPI_STATE_D0].flags.valid = 1; | |
1387 | device->power.states[ACPI_STATE_D0].power = 100; | |
8ad928d5 RW |
1388 | device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; |
1389 | device->power.states[ACPI_STATE_D3_COLD].power = 0; | |
c8f7a62c | 1390 | |
5c7dd710 RW |
1391 | /* Set D3cold's explicit_set flag if _PS3 exists. */ |
1392 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set) | |
1393 | device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1; | |
1394 | ||
1399dfcd AL |
1395 | /* Presence of _PS3 or _PRx means we can put the device into D3 cold */ |
1396 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set || | |
1397 | device->power.flags.power_resources) | |
1398 | device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1; | |
1399 | ||
b3785492 RW |
1400 | if (acpi_bus_init_power(device)) { |
1401 | acpi_free_power_resources_lists(device); | |
1402 | device->flags.power_manageable = 0; | |
1403 | } | |
9e89dde2 | 1404 | } |
c8f7a62c | 1405 | |
d43e167d | 1406 | static void acpi_bus_get_flags(struct acpi_device *device) |
1da177e4 | 1407 | { |
1da177e4 | 1408 | /* Presence of _STA indicates 'dynamic_status' */ |
952c63e9 | 1409 | if (acpi_has_method(device->handle, "_STA")) |
1da177e4 LT |
1410 | device->flags.dynamic_status = 1; |
1411 | ||
1da177e4 | 1412 | /* Presence of _RMV indicates 'removable' */ |
952c63e9 | 1413 | if (acpi_has_method(device->handle, "_RMV")) |
1da177e4 LT |
1414 | device->flags.removable = 1; |
1415 | ||
1416 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ | |
952c63e9 JL |
1417 | if (acpi_has_method(device->handle, "_EJD") || |
1418 | acpi_has_method(device->handle, "_EJ0")) | |
1da177e4 | 1419 | device->flags.ejectable = 1; |
1da177e4 LT |
1420 | } |
1421 | ||
c7bcb4e9 | 1422 | static void acpi_device_get_busid(struct acpi_device *device) |
1da177e4 | 1423 | { |
4be44fcd LB |
1424 | char bus_id[5] = { '?', 0 }; |
1425 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; | |
1426 | int i = 0; | |
1da177e4 LT |
1427 | |
1428 | /* | |
1429 | * Bus ID | |
1430 | * ------ | |
1431 | * The device's Bus ID is simply the object name. | |
1432 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? | |
1433 | */ | |
859ac9a4 | 1434 | if (ACPI_IS_ROOT_DEVICE(device)) { |
1da177e4 | 1435 | strcpy(device->pnp.bus_id, "ACPI"); |
859ac9a4 BH |
1436 | return; |
1437 | } | |
1438 | ||
1439 | switch (device->device_type) { | |
1da177e4 LT |
1440 | case ACPI_BUS_TYPE_POWER_BUTTON: |
1441 | strcpy(device->pnp.bus_id, "PWRF"); | |
1442 | break; | |
1443 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
1444 | strcpy(device->pnp.bus_id, "SLPF"); | |
1445 | break; | |
1446 | default: | |
66b7ed40 | 1447 | acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); |
1da177e4 LT |
1448 | /* Clean up trailing underscores (if any) */ |
1449 | for (i = 3; i > 1; i--) { | |
1450 | if (bus_id[i] == '_') | |
1451 | bus_id[i] = '\0'; | |
1452 | else | |
1453 | break; | |
1454 | } | |
1455 | strcpy(device->pnp.bus_id, bus_id); | |
1456 | break; | |
1457 | } | |
1458 | } | |
1459 | ||
ebf4df8d JL |
1460 | /* |
1461 | * acpi_ata_match - see if an acpi object is an ATA device | |
1462 | * | |
1463 | * If an acpi object has one of the ACPI ATA methods defined, | |
1464 | * then we can safely call it an ATA device. | |
1465 | */ | |
1466 | bool acpi_ata_match(acpi_handle handle) | |
1467 | { | |
1468 | return acpi_has_method(handle, "_GTF") || | |
1469 | acpi_has_method(handle, "_GTM") || | |
1470 | acpi_has_method(handle, "_STM") || | |
1471 | acpi_has_method(handle, "_SDD"); | |
1472 | } | |
1473 | ||
54735266 | 1474 | /* |
d4e1a692 | 1475 | * acpi_bay_match - see if an acpi object is an ejectable driver bay |
54735266 ZR |
1476 | * |
1477 | * If an acpi object is ejectable and has one of the ACPI ATA methods defined, | |
1478 | * then we can safely call it an ejectable drive bay | |
1479 | */ | |
ebf4df8d | 1480 | bool acpi_bay_match(acpi_handle handle) |
d4e1a692 | 1481 | { |
54735266 ZR |
1482 | acpi_handle phandle; |
1483 | ||
952c63e9 | 1484 | if (!acpi_has_method(handle, "_EJ0")) |
ebf4df8d JL |
1485 | return false; |
1486 | if (acpi_ata_match(handle)) | |
1487 | return true; | |
1488 | if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) | |
1489 | return false; | |
54735266 | 1490 | |
ebf4df8d | 1491 | return acpi_ata_match(phandle); |
54735266 ZR |
1492 | } |
1493 | ||
3620f2f2 | 1494 | /* |
d4e1a692 | 1495 | * acpi_dock_match - see if an acpi object has a _DCK method |
3620f2f2 | 1496 | */ |
ebf4df8d | 1497 | bool acpi_dock_match(acpi_handle handle) |
3620f2f2 | 1498 | { |
ebf4df8d | 1499 | return acpi_has_method(handle, "_DCK"); |
3620f2f2 FS |
1500 | } |
1501 | ||
620e112c | 1502 | const char *acpi_device_hid(struct acpi_device *device) |
15b8dd53 | 1503 | { |
7f47fa6c | 1504 | struct acpi_hardware_id *hid; |
15b8dd53 | 1505 | |
2b2ae7c7 TR |
1506 | if (list_empty(&device->pnp.ids)) |
1507 | return dummy_hid; | |
1508 | ||
7f47fa6c BH |
1509 | hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); |
1510 | return hid->id; | |
1511 | } | |
1512 | EXPORT_SYMBOL(acpi_device_hid); | |
15b8dd53 | 1513 | |
d4e1a692 | 1514 | static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) |
7f47fa6c BH |
1515 | { |
1516 | struct acpi_hardware_id *id; | |
15b8dd53 | 1517 | |
7f47fa6c BH |
1518 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
1519 | if (!id) | |
1520 | return; | |
15b8dd53 | 1521 | |
581de59e | 1522 | id->id = kstrdup(dev_id, GFP_KERNEL); |
7f47fa6c BH |
1523 | if (!id->id) { |
1524 | kfree(id); | |
1525 | return; | |
15b8dd53 BM |
1526 | } |
1527 | ||
d4e1a692 TK |
1528 | list_add_tail(&id->list, &pnp->ids); |
1529 | pnp->type.hardware_id = 1; | |
15b8dd53 BM |
1530 | } |
1531 | ||
222e82ac DW |
1532 | /* |
1533 | * Old IBM workstations have a DSDT bug wherein the SMBus object | |
1534 | * lacks the SMBUS01 HID and the methods do not have the necessary "_" | |
1535 | * prefix. Work around this. | |
1536 | */ | |
ebf4df8d | 1537 | static bool acpi_ibm_smbus_match(acpi_handle handle) |
222e82ac | 1538 | { |
ebf4df8d JL |
1539 | char node_name[ACPI_PATH_SEGMENT_LENGTH]; |
1540 | struct acpi_buffer path = { sizeof(node_name), node_name }; | |
222e82ac DW |
1541 | |
1542 | if (!dmi_name_in_vendors("IBM")) | |
ebf4df8d | 1543 | return false; |
222e82ac DW |
1544 | |
1545 | /* Look for SMBS object */ | |
ebf4df8d JL |
1546 | if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || |
1547 | strcmp("SMBS", path.pointer)) | |
1548 | return false; | |
222e82ac DW |
1549 | |
1550 | /* Does it have the necessary (but misnamed) methods? */ | |
952c63e9 JL |
1551 | if (acpi_has_method(handle, "SBI") && |
1552 | acpi_has_method(handle, "SBR") && | |
1553 | acpi_has_method(handle, "SBW")) | |
ebf4df8d JL |
1554 | return true; |
1555 | ||
1556 | return false; | |
222e82ac DW |
1557 | } |
1558 | ||
c0af4175 TK |
1559 | static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, |
1560 | int device_type) | |
1da177e4 | 1561 | { |
4be44fcd | 1562 | acpi_status status; |
57f3674f | 1563 | struct acpi_device_info *info; |
78e25fef | 1564 | struct acpi_pnp_device_id_list *cid_list; |
7f47fa6c | 1565 | int i; |
1da177e4 | 1566 | |
c0af4175 | 1567 | switch (device_type) { |
1da177e4 | 1568 | case ACPI_BUS_TYPE_DEVICE: |
c0af4175 TK |
1569 | if (handle == ACPI_ROOT_OBJECT) { |
1570 | acpi_add_id(pnp, ACPI_SYSTEM_HID); | |
859ac9a4 BH |
1571 | break; |
1572 | } | |
1573 | ||
c0af4175 | 1574 | status = acpi_get_object_info(handle, &info); |
1da177e4 | 1575 | if (ACPI_FAILURE(status)) { |
c0af4175 TK |
1576 | pr_err(PREFIX "%s: Error reading device info\n", |
1577 | __func__); | |
1da177e4 LT |
1578 | return; |
1579 | } | |
1580 | ||
1da177e4 | 1581 | if (info->valid & ACPI_VALID_HID) |
c0af4175 | 1582 | acpi_add_id(pnp, info->hardware_id.string); |
57f3674f | 1583 | if (info->valid & ACPI_VALID_CID) { |
15b8dd53 | 1584 | cid_list = &info->compatible_id_list; |
57f3674f | 1585 | for (i = 0; i < cid_list->count; i++) |
c0af4175 | 1586 | acpi_add_id(pnp, cid_list->ids[i].string); |
57f3674f | 1587 | } |
1da177e4 | 1588 | if (info->valid & ACPI_VALID_ADR) { |
c0af4175 TK |
1589 | pnp->bus_address = info->address; |
1590 | pnp->type.bus_address = 1; | |
1da177e4 | 1591 | } |
ccf78040 | 1592 | if (info->valid & ACPI_VALID_UID) |
c0af4175 | 1593 | pnp->unique_id = kstrdup(info->unique_id.string, |
ccf78040 | 1594 | GFP_KERNEL); |
ae843332 | 1595 | |
a83893ae BH |
1596 | kfree(info); |
1597 | ||
57f3674f BH |
1598 | /* |
1599 | * Some devices don't reliably have _HIDs & _CIDs, so add | |
1600 | * synthetic HIDs to make sure drivers can find them. | |
1601 | */ | |
c0af4175 TK |
1602 | if (acpi_is_video_device(handle)) |
1603 | acpi_add_id(pnp, ACPI_VIDEO_HID); | |
ebf4df8d | 1604 | else if (acpi_bay_match(handle)) |
c0af4175 | 1605 | acpi_add_id(pnp, ACPI_BAY_HID); |
ebf4df8d | 1606 | else if (acpi_dock_match(handle)) |
c0af4175 | 1607 | acpi_add_id(pnp, ACPI_DOCK_HID); |
ebf4df8d | 1608 | else if (acpi_ibm_smbus_match(handle)) |
c0af4175 TK |
1609 | acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); |
1610 | else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) { | |
1611 | acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */ | |
1612 | strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); | |
1613 | strcpy(pnp->device_class, ACPI_BUS_CLASS); | |
b7b30de5 | 1614 | } |
54735266 | 1615 | |
1da177e4 LT |
1616 | break; |
1617 | case ACPI_BUS_TYPE_POWER: | |
c0af4175 | 1618 | acpi_add_id(pnp, ACPI_POWER_HID); |
1da177e4 LT |
1619 | break; |
1620 | case ACPI_BUS_TYPE_PROCESSOR: | |
c0af4175 | 1621 | acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); |
1da177e4 | 1622 | break; |
1da177e4 | 1623 | case ACPI_BUS_TYPE_THERMAL: |
c0af4175 | 1624 | acpi_add_id(pnp, ACPI_THERMAL_HID); |
1da177e4 LT |
1625 | break; |
1626 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
c0af4175 | 1627 | acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); |
1da177e4 LT |
1628 | break; |
1629 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
c0af4175 | 1630 | acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); |
1da177e4 LT |
1631 | break; |
1632 | } | |
1da177e4 LT |
1633 | } |
1634 | ||
c0af4175 TK |
1635 | void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) |
1636 | { | |
1637 | struct acpi_hardware_id *id, *tmp; | |
1638 | ||
1639 | list_for_each_entry_safe(id, tmp, &pnp->ids, list) { | |
1640 | kfree(id->id); | |
1641 | kfree(id); | |
1642 | } | |
1643 | kfree(pnp->unique_id); | |
1644 | } | |
1645 | ||
82c7d5ef RW |
1646 | void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, |
1647 | int type, unsigned long long sta) | |
1da177e4 | 1648 | { |
d43e167d RW |
1649 | INIT_LIST_HEAD(&device->pnp.ids); |
1650 | device->device_type = type; | |
1651 | device->handle = handle; | |
1652 | device->parent = acpi_bus_get_parent(handle); | |
1653 | STRUCT_TO_INT(device->status) = sta; | |
1654 | acpi_device_get_busid(device); | |
c0af4175 | 1655 | acpi_set_pnp_ids(handle, &device->pnp, type); |
d43e167d | 1656 | acpi_bus_get_flags(device); |
2c0d4fe0 | 1657 | device->flags.match_driver = false; |
202317a5 RW |
1658 | device->flags.initialized = true; |
1659 | device->flags.visited = false; | |
cf860be6 RW |
1660 | device_initialize(&device->dev); |
1661 | dev_set_uevent_suppress(&device->dev, true); | |
1662 | } | |
bc3b0772 | 1663 | |
cf860be6 RW |
1664 | void acpi_device_add_finalize(struct acpi_device *device) |
1665 | { | |
1666 | dev_set_uevent_suppress(&device->dev, false); | |
1667 | kobject_uevent(&device->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
1668 | } |
1669 | ||
5c478f49 BH |
1670 | static int acpi_add_single_object(struct acpi_device **child, |
1671 | acpi_handle handle, int type, | |
2c0d4fe0 | 1672 | unsigned long long sta) |
1da177e4 | 1673 | { |
77c24888 BH |
1674 | int result; |
1675 | struct acpi_device *device; | |
29aaefa6 | 1676 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1da177e4 | 1677 | |
36bcbec7 | 1678 | device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
1da177e4 | 1679 | if (!device) { |
6468463a | 1680 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
d550d98d | 1681 | return -ENOMEM; |
1da177e4 | 1682 | } |
1da177e4 | 1683 | |
d43e167d RW |
1684 | acpi_init_device_object(device, handle, type, sta); |
1685 | acpi_bus_get_power_flags(device); | |
d57d09a4 | 1686 | acpi_bus_get_wakeup_device_flags(device); |
1da177e4 | 1687 | |
cf860be6 | 1688 | result = acpi_device_add(device, acpi_device_release); |
d43e167d | 1689 | if (result) { |
718fb0de | 1690 | acpi_device_release(&device->dev); |
d43e167d RW |
1691 | return result; |
1692 | } | |
1da177e4 | 1693 | |
d43e167d | 1694 | acpi_power_add_remove_device(device, true); |
cf860be6 | 1695 | acpi_device_add_finalize(device); |
d43e167d RW |
1696 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
1697 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n", | |
1698 | dev_name(&device->dev), (char *) buffer.pointer, | |
1699 | device->parent ? dev_name(&device->parent->dev) : "(null)")); | |
1700 | kfree(buffer.pointer); | |
1701 | *child = device; | |
1702 | return 0; | |
bf325f95 RW |
1703 | } |
1704 | ||
778cbc1d BH |
1705 | static int acpi_bus_type_and_status(acpi_handle handle, int *type, |
1706 | unsigned long long *sta) | |
1da177e4 | 1707 | { |
778cbc1d BH |
1708 | acpi_status status; |
1709 | acpi_object_type acpi_type; | |
1da177e4 | 1710 | |
778cbc1d | 1711 | status = acpi_get_type(handle, &acpi_type); |
51a85faf | 1712 | if (ACPI_FAILURE(status)) |
778cbc1d | 1713 | return -ENODEV; |
4be44fcd | 1714 | |
778cbc1d | 1715 | switch (acpi_type) { |
51a85faf BH |
1716 | case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ |
1717 | case ACPI_TYPE_DEVICE: | |
778cbc1d BH |
1718 | *type = ACPI_BUS_TYPE_DEVICE; |
1719 | status = acpi_bus_get_status_handle(handle, sta); | |
1720 | if (ACPI_FAILURE(status)) | |
1721 | return -ENODEV; | |
51a85faf BH |
1722 | break; |
1723 | case ACPI_TYPE_PROCESSOR: | |
778cbc1d BH |
1724 | *type = ACPI_BUS_TYPE_PROCESSOR; |
1725 | status = acpi_bus_get_status_handle(handle, sta); | |
1726 | if (ACPI_FAILURE(status)) | |
1727 | return -ENODEV; | |
51a85faf BH |
1728 | break; |
1729 | case ACPI_TYPE_THERMAL: | |
778cbc1d BH |
1730 | *type = ACPI_BUS_TYPE_THERMAL; |
1731 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1732 | break; |
1733 | case ACPI_TYPE_POWER: | |
778cbc1d BH |
1734 | *type = ACPI_BUS_TYPE_POWER; |
1735 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1736 | break; |
1737 | default: | |
778cbc1d | 1738 | return -ENODEV; |
51a85faf | 1739 | } |
1da177e4 | 1740 | |
778cbc1d BH |
1741 | return 0; |
1742 | } | |
1743 | ||
202317a5 RW |
1744 | bool acpi_device_is_present(struct acpi_device *adev) |
1745 | { | |
1746 | if (adev->status.present || adev->status.functional) | |
1747 | return true; | |
1748 | ||
1749 | adev->flags.initialized = false; | |
1750 | return false; | |
1751 | } | |
1752 | ||
4b59cc1f RW |
1753 | static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, |
1754 | char *idstr, | |
1755 | const struct acpi_device_id **matchid) | |
1756 | { | |
1757 | const struct acpi_device_id *devid; | |
1758 | ||
1759 | for (devid = handler->ids; devid->id[0]; devid++) | |
1760 | if (!strcmp((char *)devid->id, idstr)) { | |
1761 | if (matchid) | |
1762 | *matchid = devid; | |
1763 | ||
1764 | return true; | |
1765 | } | |
1766 | ||
1767 | return false; | |
1768 | } | |
1769 | ||
6b772e8f TK |
1770 | static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr, |
1771 | const struct acpi_device_id **matchid) | |
1772 | { | |
1773 | struct acpi_scan_handler *handler; | |
1774 | ||
1775 | list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) | |
1776 | if (acpi_scan_handler_matching(handler, idstr, matchid)) | |
1777 | return handler; | |
1778 | ||
1779 | return NULL; | |
1780 | } | |
1781 | ||
3f8055c3 RW |
1782 | void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) |
1783 | { | |
3f8055c3 RW |
1784 | if (!!hotplug->enabled == !!val) |
1785 | return; | |
1786 | ||
1787 | mutex_lock(&acpi_scan_lock); | |
1788 | ||
1789 | hotplug->enabled = val; | |
3f8055c3 RW |
1790 | |
1791 | mutex_unlock(&acpi_scan_lock); | |
1792 | } | |
1793 | ||
6b772e8f | 1794 | static void acpi_scan_init_hotplug(acpi_handle handle, int type) |
a33ec399 | 1795 | { |
6b772e8f TK |
1796 | struct acpi_device_pnp pnp = {}; |
1797 | struct acpi_hardware_id *hwid; | |
a33ec399 RW |
1798 | struct acpi_scan_handler *handler; |
1799 | ||
6b772e8f TK |
1800 | INIT_LIST_HEAD(&pnp.ids); |
1801 | acpi_set_pnp_ids(handle, &pnp, type); | |
a33ec399 | 1802 | |
6b772e8f | 1803 | if (!pnp.type.hardware_id) |
7a26b530 | 1804 | goto out; |
a33ec399 RW |
1805 | |
1806 | /* | |
1807 | * This relies on the fact that acpi_install_notify_handler() will not | |
1808 | * install the same notify handler routine twice for the same handle. | |
1809 | */ | |
6b772e8f TK |
1810 | list_for_each_entry(hwid, &pnp.ids, list) { |
1811 | handler = acpi_scan_match_handler(hwid->id, NULL); | |
3338db00 | 1812 | if (handler) { |
2cbb14fb TK |
1813 | acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
1814 | acpi_hotplug_notify_cb, handler); | |
6b772e8f TK |
1815 | break; |
1816 | } | |
1817 | } | |
1818 | ||
7a26b530 | 1819 | out: |
6b772e8f | 1820 | acpi_free_pnp_ids(&pnp); |
a33ec399 RW |
1821 | } |
1822 | ||
e3863094 RW |
1823 | static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, |
1824 | void *not_used, void **return_value) | |
778cbc1d | 1825 | { |
805d410f | 1826 | struct acpi_device *device = NULL; |
778cbc1d BH |
1827 | int type; |
1828 | unsigned long long sta; | |
1829 | int result; | |
1830 | ||
4002bf38 RW |
1831 | acpi_bus_get_device(handle, &device); |
1832 | if (device) | |
1833 | goto out; | |
1834 | ||
778cbc1d BH |
1835 | result = acpi_bus_type_and_status(handle, &type, &sta); |
1836 | if (result) | |
1837 | return AE_OK; | |
1838 | ||
82c7d5ef RW |
1839 | if (type == ACPI_BUS_TYPE_POWER) { |
1840 | acpi_add_power_resource(handle); | |
1841 | return AE_OK; | |
1842 | } | |
1843 | ||
6b772e8f | 1844 | acpi_scan_init_hotplug(handle, type); |
a33ec399 | 1845 | |
2c0d4fe0 | 1846 | acpi_add_single_object(&device, handle, type, sta); |
e3b87f8a | 1847 | if (!device) |
51a85faf | 1848 | return AE_CTRL_DEPTH; |
1da177e4 | 1849 | |
4002bf38 | 1850 | out: |
51a85faf BH |
1851 | if (!*return_value) |
1852 | *return_value = device; | |
805d410f | 1853 | |
51a85faf BH |
1854 | return AE_OK; |
1855 | } | |
3fb02738 | 1856 | |
c5698074 | 1857 | static int acpi_scan_attach_handler(struct acpi_device *device) |
ca589f94 | 1858 | { |
c5698074 RW |
1859 | struct acpi_hardware_id *hwid; |
1860 | int ret = 0; | |
ca589f94 | 1861 | |
c5698074 | 1862 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
87b85b3c | 1863 | const struct acpi_device_id *devid; |
c5698074 | 1864 | struct acpi_scan_handler *handler; |
ca589f94 | 1865 | |
c5698074 RW |
1866 | handler = acpi_scan_match_handler(hwid->id, &devid); |
1867 | if (handler) { | |
87b85b3c RW |
1868 | ret = handler->attach(device, devid); |
1869 | if (ret > 0) { | |
1870 | device->handler = handler; | |
c5698074 | 1871 | break; |
87b85b3c | 1872 | } else if (ret < 0) { |
c5698074 | 1873 | break; |
87b85b3c | 1874 | } |
ca589f94 RW |
1875 | } |
1876 | } | |
1877 | return ret; | |
1878 | } | |
1879 | ||
0fc300b0 RW |
1880 | static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used, |
1881 | void *not_used, void **ret_not_used) | |
51a85faf | 1882 | { |
805d410f | 1883 | struct acpi_device *device; |
202317a5 | 1884 | unsigned long long sta; |
ca589f94 | 1885 | int ret; |
3fb02738 | 1886 | |
805d410f RW |
1887 | /* |
1888 | * Ignore errors ignored by acpi_bus_check_add() to avoid terminating | |
1889 | * namespace walks prematurely. | |
1890 | */ | |
202317a5 | 1891 | if (acpi_bus_type_and_status(handle, &ret, &sta)) |
805d410f | 1892 | return AE_OK; |
1da177e4 | 1893 | |
805d410f RW |
1894 | if (acpi_bus_get_device(handle, &device)) |
1895 | return AE_CTRL_DEPTH; | |
7779688f | 1896 | |
202317a5 RW |
1897 | STRUCT_TO_INT(device->status) = sta; |
1898 | /* Skip devices that are not present. */ | |
1899 | if (!acpi_device_is_present(device)) | |
1900 | goto err; | |
1901 | ||
3a391a39 RW |
1902 | if (device->handler) |
1903 | return AE_OK; | |
1904 | ||
202317a5 RW |
1905 | if (!device->flags.initialized) { |
1906 | acpi_bus_update_power(device, NULL); | |
1907 | device->flags.initialized = true; | |
1908 | } | |
ca589f94 | 1909 | ret = acpi_scan_attach_handler(device); |
6931007c | 1910 | if (ret < 0) |
202317a5 | 1911 | goto err; |
6931007c RW |
1912 | |
1913 | device->flags.match_driver = true; | |
1914 | if (ret > 0) | |
202317a5 | 1915 | goto ok; |
ca589f94 RW |
1916 | |
1917 | ret = device_attach(&device->dev); | |
202317a5 RW |
1918 | if (ret < 0) |
1919 | goto err; | |
1920 | ||
1921 | ok: | |
1922 | device->flags.visited = true; | |
1923 | return AE_OK; | |
1924 | ||
1925 | err: | |
1926 | device->flags.visited = false; | |
1927 | return AE_CTRL_DEPTH; | |
1da177e4 | 1928 | } |
1da177e4 | 1929 | |
636458de | 1930 | /** |
b8bd759a | 1931 | * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. |
636458de | 1932 | * @handle: Root of the namespace scope to scan. |
7779688f | 1933 | * |
636458de RW |
1934 | * Scan a given ACPI tree (probably recently hot-plugged) and create and add |
1935 | * found devices. | |
7779688f | 1936 | * |
636458de RW |
1937 | * If no devices were found, -ENODEV is returned, but it does not mean that |
1938 | * there has been a real error. There just have been no suitable ACPI objects | |
1939 | * in the table trunk from which the kernel could create a device and add an | |
1940 | * appropriate driver. | |
3757b948 RW |
1941 | * |
1942 | * Must be called under acpi_scan_lock. | |
7779688f | 1943 | */ |
b8bd759a | 1944 | int acpi_bus_scan(acpi_handle handle) |
3fb02738 | 1945 | { |
b8bd759a | 1946 | void *device = NULL; |
c511cc19 | 1947 | int error = 0; |
3fb02738 | 1948 | |
b8bd759a RW |
1949 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device))) |
1950 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
1951 | acpi_bus_check_add, NULL, NULL, &device); | |
3fb02738 | 1952 | |
d2f6650a | 1953 | if (!device) |
c511cc19 RW |
1954 | error = -ENODEV; |
1955 | else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL))) | |
b8bd759a RW |
1956 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
1957 | acpi_bus_device_attach, NULL, NULL, NULL); | |
3fb02738 | 1958 | |
c511cc19 | 1959 | return error; |
3fb02738 | 1960 | } |
b8bd759a | 1961 | EXPORT_SYMBOL(acpi_bus_scan); |
a2100801 | 1962 | |
05404d8f RW |
1963 | static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used, |
1964 | void *not_used, void **ret_not_used) | |
1965 | { | |
1966 | struct acpi_device *device = NULL; | |
a2100801 | 1967 | |
05404d8f | 1968 | if (!acpi_bus_get_device(handle, &device)) { |
ca589f94 RW |
1969 | struct acpi_scan_handler *dev_handler = device->handler; |
1970 | ||
ca589f94 RW |
1971 | if (dev_handler) { |
1972 | if (dev_handler->detach) | |
1973 | dev_handler->detach(device); | |
1974 | ||
1975 | device->handler = NULL; | |
1976 | } else { | |
1977 | device_release_driver(&device->dev); | |
1978 | } | |
202317a5 RW |
1979 | /* |
1980 | * Most likely, the device is going away, so put it into D3cold | |
1981 | * before that. | |
1982 | */ | |
1983 | acpi_device_set_power(device, ACPI_STATE_D3_COLD); | |
1984 | device->flags.initialized = false; | |
1985 | device->flags.visited = false; | |
05404d8f RW |
1986 | } |
1987 | return AE_OK; | |
3fb02738 | 1988 | } |
1da177e4 | 1989 | |
3757b948 RW |
1990 | /** |
1991 | * acpi_bus_trim - Remove ACPI device node and all of its descendants | |
1992 | * @start: Root of the ACPI device nodes subtree to remove. | |
1993 | * | |
1994 | * Must be called under acpi_scan_lock. | |
1995 | */ | |
bfee26db | 1996 | void acpi_bus_trim(struct acpi_device *start) |
1da177e4 | 1997 | { |
05404d8f RW |
1998 | /* |
1999 | * Execute acpi_bus_device_detach() as a post-order callback to detach | |
2000 | * all ACPI drivers from the device nodes being removed. | |
2001 | */ | |
2002 | acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL, | |
2003 | acpi_bus_device_detach, NULL, NULL); | |
2004 | acpi_bus_device_detach(start->handle, 0, NULL, NULL); | |
1da177e4 | 2005 | } |
ceaba663 KA |
2006 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
2007 | ||
e8b945c9 | 2008 | static int acpi_bus_scan_fixed(void) |
1da177e4 | 2009 | { |
4be44fcd | 2010 | int result = 0; |
c4168bff | 2011 | |
1da177e4 LT |
2012 | /* |
2013 | * Enumerate all fixed-feature devices. | |
2014 | */ | |
2c0d4fe0 RW |
2015 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { |
2016 | struct acpi_device *device = NULL; | |
2017 | ||
5c478f49 | 2018 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2019 | ACPI_BUS_TYPE_POWER_BUTTON, |
2c0d4fe0 RW |
2020 | ACPI_STA_DEFAULT); |
2021 | if (result) | |
2022 | return result; | |
2023 | ||
88346167 | 2024 | device->flags.match_driver = true; |
2c0d4fe0 RW |
2025 | result = device_attach(&device->dev); |
2026 | if (result < 0) | |
2027 | return result; | |
2028 | ||
c10d7a13 | 2029 | device_init_wakeup(&device->dev, true); |
3fb02738 | 2030 | } |
1da177e4 | 2031 | |
2c0d4fe0 RW |
2032 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { |
2033 | struct acpi_device *device = NULL; | |
2034 | ||
5c478f49 | 2035 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2036 | ACPI_BUS_TYPE_SLEEP_BUTTON, |
2c0d4fe0 RW |
2037 | ACPI_STA_DEFAULT); |
2038 | if (result) | |
2039 | return result; | |
2040 | ||
88346167 | 2041 | device->flags.match_driver = true; |
2c0d4fe0 | 2042 | result = device_attach(&device->dev); |
3fb02738 | 2043 | } |
1da177e4 | 2044 | |
2c0d4fe0 | 2045 | return result < 0 ? result : 0; |
1da177e4 LT |
2046 | } |
2047 | ||
e747f274 | 2048 | int __init acpi_scan_init(void) |
1da177e4 LT |
2049 | { |
2050 | int result; | |
1da177e4 | 2051 | |
5b327265 PM |
2052 | result = bus_register(&acpi_bus_type); |
2053 | if (result) { | |
2054 | /* We don't want to quit even if we failed to add suspend/resume */ | |
2055 | printk(KERN_ERR PREFIX "Could not register bus type\n"); | |
2056 | } | |
2057 | ||
92ef2a25 | 2058 | acpi_pci_root_init(); |
4daeaf68 | 2059 | acpi_pci_link_init(); |
ac212b69 | 2060 | acpi_processor_init(); |
141a297b | 2061 | acpi_platform_init(); |
f58b082a | 2062 | acpi_lpss_init(); |
2fa97feb | 2063 | acpi_cmos_rtc_init(); |
737f1a9f | 2064 | acpi_container_init(); |
0a347644 | 2065 | acpi_memory_hotplug_init(); |
94add0f8 | 2066 | acpi_dock_init(); |
97d9a9e9 | 2067 | |
3757b948 | 2068 | mutex_lock(&acpi_scan_lock); |
1da177e4 LT |
2069 | /* |
2070 | * Enumerate devices in the ACPI namespace. | |
2071 | */ | |
0cd6ac52 RW |
2072 | result = acpi_bus_scan(ACPI_ROOT_OBJECT); |
2073 | if (result) | |
3757b948 | 2074 | goto out; |
1da177e4 | 2075 | |
0cd6ac52 | 2076 | result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); |
1da177e4 | 2077 | if (result) |
3757b948 | 2078 | goto out; |
1da177e4 | 2079 | |
b8bd759a RW |
2080 | result = acpi_bus_scan_fixed(); |
2081 | if (result) { | |
202317a5 RW |
2082 | acpi_detach_data(acpi_root->handle, acpi_scan_drop_device); |
2083 | acpi_device_del(acpi_root); | |
2084 | put_device(&acpi_root->dev); | |
3757b948 | 2085 | goto out; |
b8bd759a | 2086 | } |
1da177e4 | 2087 | |
b8bd759a | 2088 | acpi_update_all_gpes(); |
3757b948 RW |
2089 | |
2090 | out: | |
2091 | mutex_unlock(&acpi_scan_lock); | |
2092 | return result; | |
1da177e4 | 2093 | } |