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Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * scan.c - support for transforming the ACPI namespace into individual objects | |
3 | */ | |
4 | ||
5 | #include <linux/module.h> | |
6 | #include <linux/init.h> | |
5a0e3ad6 | 7 | #include <linux/slab.h> |
9b6d97b6 | 8 | #include <linux/kernel.h> |
1da177e4 | 9 | #include <linux/acpi.h> |
74523c90 AK |
10 | #include <linux/signal.h> |
11 | #include <linux/kthread.h> | |
222e82ac | 12 | #include <linux/dmi.h> |
d1efe3c3 | 13 | #include <linux/nls.h> |
1da177e4 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 | |
3757b948 | 209 | /* If there is no handle, the device node has been unregistered. */ |
a33ec399 | 210 | if (!handle) { |
3757b948 RW |
211 | dev_dbg(&device->dev, "ACPI handle missing\n"); |
212 | put_device(&device->dev); | |
a33ec399 | 213 | return -EINVAL; |
3757b948 RW |
214 | } |
215 | ||
303bfdb1 RW |
216 | /* |
217 | * Carry out two passes here and ignore errors in the first pass, | |
218 | * because if the devices in question are memory blocks and | |
219 | * CONFIG_MEMCG is set, one of the blocks may hold data structures | |
220 | * that the other blocks depend on, but it is not known in advance which | |
221 | * block holds them. | |
222 | * | |
223 | * If the first pass is successful, the second one isn't needed, though. | |
224 | */ | |
225 | errdev = NULL; | |
7f28ddec RW |
226 | status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
227 | NULL, acpi_bus_offline, (void *)false, | |
228 | (void **)&errdev); | |
229 | if (status == AE_SUPPORT) { | |
230 | dev_warn(errdev, "Offline disabled.\n"); | |
231 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
232 | acpi_bus_online, NULL, NULL, NULL); | |
233 | put_device(&device->dev); | |
234 | return -EPERM; | |
235 | } | |
236 | acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev); | |
303bfdb1 RW |
237 | if (errdev) { |
238 | errdev = NULL; | |
683058e3 | 239 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
7f28ddec RW |
240 | NULL, acpi_bus_offline, (void *)true, |
241 | (void **)&errdev); | |
303bfdb1 | 242 | if (!errdev || acpi_force_hot_remove) |
7f28ddec RW |
243 | acpi_bus_offline(handle, 0, (void *)true, |
244 | (void **)&errdev); | |
303bfdb1 RW |
245 | |
246 | if (errdev && !acpi_force_hot_remove) { | |
247 | dev_warn(errdev, "Offline failed.\n"); | |
7f28ddec | 248 | acpi_bus_online(handle, 0, NULL, NULL); |
303bfdb1 | 249 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, |
7f28ddec RW |
250 | ACPI_UINT32_MAX, acpi_bus_online, |
251 | NULL, NULL, NULL); | |
303bfdb1 RW |
252 | put_device(&device->dev); |
253 | return -EBUSY; | |
254 | } | |
683058e3 RW |
255 | } |
256 | ||
26d46867 | 257 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
0794469d | 258 | "Hot-removing device %s...\n", dev_name(&device->dev))); |
26d46867 | 259 | |
bfee26db | 260 | acpi_bus_trim(device); |
683058e3 | 261 | |
3757b948 | 262 | put_device(&device->dev); |
b3c450c3 TK |
263 | device = NULL; |
264 | ||
7d2421f8 | 265 | acpi_evaluate_lck(handle, 0); |
1da177e4 LT |
266 | /* |
267 | * TBD: _EJD support. | |
268 | */ | |
7d2421f8 JL |
269 | status = acpi_evaluate_ej0(handle); |
270 | if (status == AE_NOT_FOUND) | |
271 | return -ENODEV; | |
272 | else if (ACPI_FAILURE(status)) | |
273 | return -EIO; | |
1da177e4 | 274 | |
882fd12e TK |
275 | /* |
276 | * Verify if eject was indeed successful. If not, log an error | |
277 | * message. No need to call _OST since _EJ0 call was made OK. | |
278 | */ | |
279 | status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); | |
280 | if (ACPI_FAILURE(status)) { | |
281 | acpi_handle_warn(handle, | |
282 | "Status check after eject failed (0x%x)\n", status); | |
283 | } else if (sta & ACPI_STA_DEVICE_ENABLED) { | |
284 | acpi_handle_warn(handle, | |
285 | "Eject incomplete - status 0x%llx\n", sta); | |
286 | } | |
287 | ||
a33ec399 RW |
288 | return 0; |
289 | } | |
1da177e4 | 290 | |
7b98118a | 291 | void acpi_bus_device_eject(void *data, u32 ost_src) |
a33ec399 | 292 | { |
7b98118a | 293 | struct acpi_device *device = data; |
a3b1b1ef | 294 | acpi_handle handle = device->handle; |
a33ec399 | 295 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
f943db40 | 296 | int error; |
a33ec399 | 297 | |
e0ae8fee | 298 | lock_device_hotplug(); |
a33ec399 RW |
299 | mutex_lock(&acpi_scan_lock); |
300 | ||
a3b1b1ef RW |
301 | if (ost_src == ACPI_NOTIFY_EJECT_REQUEST) |
302 | acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, | |
303 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); | |
7f28ddec | 304 | |
c1beb0bd | 305 | if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER) |
a33ec399 | 306 | kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE); |
a33ec399 | 307 | |
f943db40 | 308 | error = acpi_scan_hot_remove(device); |
7f28ddec RW |
309 | if (error == -EPERM) { |
310 | goto err_support; | |
311 | } else if (error) { | |
f943db40 | 312 | goto err_out; |
7f28ddec | 313 | } |
1da177e4 | 314 | |
3757b948 | 315 | out: |
f058cdf4 | 316 | mutex_unlock(&acpi_scan_lock); |
e0ae8fee | 317 | unlock_device_hotplug(); |
c8d72a5e | 318 | return; |
a33ec399 | 319 | |
7f28ddec RW |
320 | err_support: |
321 | ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; | |
a33ec399 | 322 | err_out: |
a3b1b1ef | 323 | acpi_evaluate_hotplug_ost(handle, ost_src, ost_code, NULL); |
a33ec399 RW |
324 | goto out; |
325 | } | |
326 | ||
7b98118a | 327 | static void acpi_scan_bus_device_check(void *data, u32 ost_source) |
a33ec399 | 328 | { |
7b98118a | 329 | acpi_handle handle = data; |
202317a5 | 330 | struct acpi_device *device; |
a33ec399 RW |
331 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
332 | int error; | |
333 | ||
683058e3 | 334 | lock_device_hotplug(); |
e0ae8fee | 335 | mutex_lock(&acpi_scan_lock); |
a33ec399 | 336 | |
8832f7e4 | 337 | if (ost_source != ACPI_NOTIFY_BUS_CHECK) { |
202317a5 | 338 | device = NULL; |
8832f7e4 | 339 | acpi_bus_get_device(handle, &device); |
202317a5 | 340 | if (acpi_device_enumerated(device)) { |
8832f7e4 RW |
341 | dev_warn(&device->dev, "Attempt to re-insert\n"); |
342 | goto out; | |
343 | } | |
a33ec399 | 344 | } |
a33ec399 RW |
345 | error = acpi_bus_scan(handle); |
346 | if (error) { | |
347 | acpi_handle_warn(handle, "Namespace scan failure\n"); | |
348 | goto out; | |
349 | } | |
202317a5 RW |
350 | device = NULL; |
351 | acpi_bus_get_device(handle, &device); | |
352 | if (!acpi_device_enumerated(device)) { | |
353 | acpi_handle_warn(handle, "Device not enumerated\n"); | |
a33ec399 RW |
354 | goto out; |
355 | } | |
356 | ost_code = ACPI_OST_SC_SUCCESS; | |
357 | if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER) | |
358 | kobject_uevent(&device->dev.kobj, KOBJ_ONLINE); | |
359 | ||
360 | out: | |
361 | acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL); | |
362 | mutex_unlock(&acpi_scan_lock); | |
e0ae8fee | 363 | unlock_device_hotplug(); |
a33ec399 RW |
364 | } |
365 | ||
2cbb14fb | 366 | static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) |
a33ec399 | 367 | { |
1ceaba05 | 368 | u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; |
2cbb14fb | 369 | struct acpi_scan_handler *handler = data; |
a3b1b1ef | 370 | struct acpi_device *adev; |
a33ec399 RW |
371 | acpi_status status; |
372 | ||
373 | switch (type) { | |
374 | case ACPI_NOTIFY_BUS_CHECK: | |
375 | acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); | |
a33ec399 RW |
376 | break; |
377 | case ACPI_NOTIFY_DEVICE_CHECK: | |
378 | acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); | |
a33ec399 RW |
379 | break; |
380 | case ACPI_NOTIFY_EJECT_REQUEST: | |
381 | acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); | |
1ceaba05 RW |
382 | if (!handler->hotplug.enabled) { |
383 | acpi_handle_err(handle, "Eject disabled\n"); | |
384 | ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; | |
385 | goto err_out; | |
386 | } | |
5beaee4f | 387 | if (acpi_bus_get_device(handle, &adev)) |
a3b1b1ef RW |
388 | goto err_out; |
389 | ||
390 | get_device(&adev->dev); | |
7b98118a | 391 | status = acpi_hotplug_execute(acpi_bus_device_eject, adev, type); |
a3b1b1ef RW |
392 | if (ACPI_SUCCESS(status)) |
393 | return; | |
394 | ||
395 | put_device(&adev->dev); | |
396 | goto err_out; | |
a33ec399 RW |
397 | default: |
398 | /* non-hotplug event; possibly handled by other handler */ | |
399 | return; | |
400 | } | |
7b98118a | 401 | status = acpi_hotplug_execute(acpi_scan_bus_device_check, handle, type); |
a3b1b1ef RW |
402 | if (ACPI_SUCCESS(status)) |
403 | return; | |
a33ec399 | 404 | |
a3b1b1ef | 405 | err_out: |
1ceaba05 | 406 | acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); |
1da177e4 LT |
407 | } |
408 | ||
836aedb1 RW |
409 | static ssize_t real_power_state_show(struct device *dev, |
410 | struct device_attribute *attr, char *buf) | |
411 | { | |
412 | struct acpi_device *adev = to_acpi_device(dev); | |
413 | int state; | |
414 | int ret; | |
415 | ||
416 | ret = acpi_device_get_power(adev, &state); | |
417 | if (ret) | |
418 | return ret; | |
419 | ||
420 | return sprintf(buf, "%s\n", acpi_power_state_string(state)); | |
421 | } | |
422 | ||
423 | static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL); | |
424 | ||
425 | static ssize_t power_state_show(struct device *dev, | |
426 | struct device_attribute *attr, char *buf) | |
427 | { | |
428 | struct acpi_device *adev = to_acpi_device(dev); | |
429 | ||
430 | return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state)); | |
431 | } | |
432 | ||
433 | static DEVICE_ATTR(power_state, 0444, power_state_show, NULL); | |
434 | ||
1da177e4 | 435 | static ssize_t |
f883d9db PM |
436 | acpi_eject_store(struct device *d, struct device_attribute *attr, |
437 | const char *buf, size_t count) | |
1da177e4 | 438 | { |
f883d9db | 439 | struct acpi_device *acpi_device = to_acpi_device(d); |
a33ec399 RW |
440 | acpi_object_type not_used; |
441 | acpi_status status; | |
1da177e4 | 442 | |
a33ec399 | 443 | if (!count || buf[0] != '1') |
1da177e4 | 444 | return -EINVAL; |
1da177e4 | 445 | |
a33ec399 RW |
446 | if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled) |
447 | && !acpi_device->driver) | |
448 | return -ENODEV; | |
449 | ||
450 | status = acpi_get_type(acpi_device->handle, ¬_used); | |
451 | if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable) | |
452 | return -ENODEV; | |
453 | ||
f943db40 | 454 | acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, |
a33ec399 | 455 | ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); |
a33ec399 | 456 | get_device(&acpi_device->dev); |
7b98118a RW |
457 | status = acpi_hotplug_execute(acpi_bus_device_eject, acpi_device, |
458 | ACPI_OST_EC_OSPM_EJECT); | |
f943db40 RW |
459 | if (ACPI_SUCCESS(status)) |
460 | return count; | |
a33ec399 | 461 | |
f943db40 | 462 | put_device(&acpi_device->dev); |
f943db40 | 463 | acpi_evaluate_hotplug_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, |
a33ec399 | 464 | ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); |
5add99cf | 465 | return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN; |
1da177e4 LT |
466 | } |
467 | ||
f883d9db | 468 | static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); |
1da177e4 | 469 | |
e49bd2dd ZR |
470 | static ssize_t |
471 | acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
472 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
1da177e4 | 473 | |
ea8d82fd | 474 | return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev)); |
1da177e4 | 475 | } |
e49bd2dd | 476 | static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); |
1da177e4 | 477 | |
923d4a45 LZ |
478 | static ssize_t acpi_device_uid_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, "%s\n", acpi_dev->pnp.unique_id); | |
484 | } | |
485 | static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL); | |
486 | ||
487 | static ssize_t acpi_device_adr_show(struct device *dev, | |
488 | struct device_attribute *attr, char *buf) | |
489 | { | |
490 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
491 | ||
492 | return sprintf(buf, "0x%08x\n", | |
493 | (unsigned int)(acpi_dev->pnp.bus_address)); | |
494 | } | |
495 | static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL); | |
496 | ||
e49bd2dd ZR |
497 | static ssize_t |
498 | acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { | |
499 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
500 | struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; | |
501 | int result; | |
1da177e4 | 502 | |
e49bd2dd | 503 | result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); |
0c526d96 | 504 | if (result) |
e49bd2dd | 505 | goto end; |
1da177e4 | 506 | |
e49bd2dd ZR |
507 | result = sprintf(buf, "%s\n", (char*)path.pointer); |
508 | kfree(path.pointer); | |
0c526d96 | 509 | end: |
e49bd2dd | 510 | return result; |
1da177e4 | 511 | } |
e49bd2dd | 512 | static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); |
1da177e4 | 513 | |
d1efe3c3 LO |
514 | /* sysfs file that shows description text from the ACPI _STR method */ |
515 | static ssize_t description_show(struct device *dev, | |
516 | struct device_attribute *attr, | |
517 | char *buf) { | |
518 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
519 | int result; | |
520 | ||
521 | if (acpi_dev->pnp.str_obj == NULL) | |
522 | return 0; | |
523 | ||
524 | /* | |
525 | * The _STR object contains a Unicode identifier for a device. | |
526 | * We need to convert to utf-8 so it can be displayed. | |
527 | */ | |
528 | result = utf16s_to_utf8s( | |
529 | (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer, | |
530 | acpi_dev->pnp.str_obj->buffer.length, | |
531 | UTF16_LITTLE_ENDIAN, buf, | |
532 | PAGE_SIZE); | |
533 | ||
534 | buf[result++] = '\n'; | |
535 | ||
536 | return result; | |
537 | } | |
538 | static DEVICE_ATTR(description, 0444, description_show, NULL); | |
539 | ||
bb74ac23 YI |
540 | static ssize_t |
541 | acpi_device_sun_show(struct device *dev, struct device_attribute *attr, | |
542 | char *buf) { | |
543 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
544 | ||
545 | return sprintf(buf, "%lu\n", acpi_dev->pnp.sun); | |
546 | } | |
547 | static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL); | |
548 | ||
e49bd2dd | 549 | static int acpi_device_setup_files(struct acpi_device *dev) |
1da177e4 | 550 | { |
d1efe3c3 | 551 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; |
f883d9db | 552 | acpi_status status; |
bb74ac23 | 553 | unsigned long long sun; |
e49bd2dd | 554 | int result = 0; |
1da177e4 LT |
555 | |
556 | /* | |
e49bd2dd | 557 | * Devices gotten from FADT don't have a "path" attribute |
1da177e4 | 558 | */ |
0c526d96 | 559 | if (dev->handle) { |
e49bd2dd | 560 | result = device_create_file(&dev->dev, &dev_attr_path); |
0c526d96 | 561 | if (result) |
e49bd2dd | 562 | goto end; |
1da177e4 LT |
563 | } |
564 | ||
2b2ae7c7 TR |
565 | if (!list_empty(&dev->pnp.ids)) { |
566 | result = device_create_file(&dev->dev, &dev_attr_hid); | |
567 | if (result) | |
568 | goto end; | |
1da177e4 | 569 | |
2b2ae7c7 TR |
570 | result = device_create_file(&dev->dev, &dev_attr_modalias); |
571 | if (result) | |
572 | goto end; | |
573 | } | |
29b71a1c | 574 | |
d1efe3c3 LO |
575 | /* |
576 | * If device has _STR, 'description' file is created | |
577 | */ | |
952c63e9 | 578 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
579 | status = acpi_evaluate_object(dev->handle, "_STR", |
580 | NULL, &buffer); | |
581 | if (ACPI_FAILURE(status)) | |
582 | buffer.pointer = NULL; | |
583 | dev->pnp.str_obj = buffer.pointer; | |
584 | result = device_create_file(&dev->dev, &dev_attr_description); | |
585 | if (result) | |
586 | goto end; | |
587 | } | |
588 | ||
d4e1a692 | 589 | if (dev->pnp.type.bus_address) |
923d4a45 LZ |
590 | result = device_create_file(&dev->dev, &dev_attr_adr); |
591 | if (dev->pnp.unique_id) | |
592 | result = device_create_file(&dev->dev, &dev_attr_uid); | |
593 | ||
bb74ac23 YI |
594 | status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun); |
595 | if (ACPI_SUCCESS(status)) { | |
596 | dev->pnp.sun = (unsigned long)sun; | |
597 | result = device_create_file(&dev->dev, &dev_attr_sun); | |
598 | if (result) | |
599 | goto end; | |
600 | } else { | |
601 | dev->pnp.sun = (unsigned long)-1; | |
602 | } | |
603 | ||
e49bd2dd ZR |
604 | /* |
605 | * If device has _EJ0, 'eject' file is created that is used to trigger | |
606 | * hot-removal function from userland. | |
607 | */ | |
952c63e9 | 608 | if (acpi_has_method(dev->handle, "_EJ0")) { |
e49bd2dd | 609 | result = device_create_file(&dev->dev, &dev_attr_eject); |
836aedb1 RW |
610 | if (result) |
611 | return result; | |
612 | } | |
613 | ||
614 | if (dev->flags.power_manageable) { | |
615 | result = device_create_file(&dev->dev, &dev_attr_power_state); | |
616 | if (result) | |
617 | return result; | |
618 | ||
619 | if (dev->power.flags.power_resources) | |
620 | result = device_create_file(&dev->dev, | |
621 | &dev_attr_real_power_state); | |
622 | } | |
623 | ||
0c526d96 | 624 | end: |
e49bd2dd | 625 | return result; |
1da177e4 LT |
626 | } |
627 | ||
f883d9db | 628 | static void acpi_device_remove_files(struct acpi_device *dev) |
1da177e4 | 629 | { |
836aedb1 RW |
630 | if (dev->flags.power_manageable) { |
631 | device_remove_file(&dev->dev, &dev_attr_power_state); | |
632 | if (dev->power.flags.power_resources) | |
633 | device_remove_file(&dev->dev, | |
634 | &dev_attr_real_power_state); | |
635 | } | |
636 | ||
f883d9db | 637 | /* |
d1efe3c3 LO |
638 | * If device has _STR, remove 'description' file |
639 | */ | |
952c63e9 | 640 | if (acpi_has_method(dev->handle, "_STR")) { |
d1efe3c3 LO |
641 | kfree(dev->pnp.str_obj); |
642 | device_remove_file(&dev->dev, &dev_attr_description); | |
643 | } | |
644 | /* | |
645 | * If device has _EJ0, remove 'eject' file. | |
f883d9db | 646 | */ |
952c63e9 | 647 | if (acpi_has_method(dev->handle, "_EJ0")) |
f883d9db | 648 | device_remove_file(&dev->dev, &dev_attr_eject); |
1da177e4 | 649 | |
952c63e9 | 650 | if (acpi_has_method(dev->handle, "_SUN")) |
bb74ac23 YI |
651 | device_remove_file(&dev->dev, &dev_attr_sun); |
652 | ||
923d4a45 LZ |
653 | if (dev->pnp.unique_id) |
654 | device_remove_file(&dev->dev, &dev_attr_uid); | |
d4e1a692 | 655 | if (dev->pnp.type.bus_address) |
923d4a45 | 656 | device_remove_file(&dev->dev, &dev_attr_adr); |
1131b938 BH |
657 | device_remove_file(&dev->dev, &dev_attr_modalias); |
658 | device_remove_file(&dev->dev, &dev_attr_hid); | |
0c526d96 | 659 | if (dev->handle) |
e49bd2dd | 660 | device_remove_file(&dev->dev, &dev_attr_path); |
1da177e4 | 661 | } |
1da177e4 | 662 | /* -------------------------------------------------------------------------- |
9e89dde2 | 663 | ACPI Bus operations |
1da177e4 | 664 | -------------------------------------------------------------------------- */ |
29b71a1c | 665 | |
cf761af9 MW |
666 | static const struct acpi_device_id *__acpi_match_device( |
667 | struct acpi_device *device, const struct acpi_device_id *ids) | |
29b71a1c TR |
668 | { |
669 | const struct acpi_device_id *id; | |
7f47fa6c | 670 | struct acpi_hardware_id *hwid; |
29b71a1c | 671 | |
39a0ad87 ZY |
672 | /* |
673 | * If the device is not present, it is unnecessary to load device | |
674 | * driver for it. | |
675 | */ | |
676 | if (!device->status.present) | |
cf761af9 | 677 | return NULL; |
39a0ad87 | 678 | |
7f47fa6c BH |
679 | for (id = ids; id->id[0]; id++) |
680 | list_for_each_entry(hwid, &device->pnp.ids, list) | |
681 | if (!strcmp((char *) id->id, hwid->id)) | |
cf761af9 MW |
682 | return id; |
683 | ||
684 | return NULL; | |
685 | } | |
686 | ||
687 | /** | |
688 | * acpi_match_device - Match a struct device against a given list of ACPI IDs | |
689 | * @ids: Array of struct acpi_device_id object to match against. | |
690 | * @dev: The device structure to match. | |
691 | * | |
692 | * Check if @dev has a valid ACPI handle and if there is a struct acpi_device | |
693 | * object for that handle and use that object to match against a given list of | |
694 | * device IDs. | |
695 | * | |
696 | * Return a pointer to the first matching ID on success or %NULL on failure. | |
697 | */ | |
698 | const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, | |
699 | const struct device *dev) | |
700 | { | |
701 | struct acpi_device *adev; | |
0613e1f7 | 702 | acpi_handle handle = ACPI_HANDLE(dev); |
cf761af9 | 703 | |
0613e1f7 | 704 | if (!ids || !handle || acpi_bus_get_device(handle, &adev)) |
cf761af9 MW |
705 | return NULL; |
706 | ||
707 | return __acpi_match_device(adev, ids); | |
708 | } | |
709 | EXPORT_SYMBOL_GPL(acpi_match_device); | |
29b71a1c | 710 | |
cf761af9 MW |
711 | int acpi_match_device_ids(struct acpi_device *device, |
712 | const struct acpi_device_id *ids) | |
713 | { | |
714 | return __acpi_match_device(device, ids) ? 0 : -ENOENT; | |
29b71a1c TR |
715 | } |
716 | EXPORT_SYMBOL(acpi_match_device_ids); | |
717 | ||
0b224527 RW |
718 | static void acpi_free_power_resources_lists(struct acpi_device *device) |
719 | { | |
720 | int i; | |
721 | ||
993cbe59 RW |
722 | if (device->wakeup.flags.valid) |
723 | acpi_power_resources_list_free(&device->wakeup.resources); | |
724 | ||
0b224527 RW |
725 | if (!device->flags.power_manageable) |
726 | return; | |
727 | ||
728 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { | |
729 | struct acpi_device_power_state *ps = &device->power.states[i]; | |
730 | acpi_power_resources_list_free(&ps->resources); | |
731 | } | |
7f47fa6c BH |
732 | } |
733 | ||
1890a97a | 734 | static void acpi_device_release(struct device *dev) |
1da177e4 | 735 | { |
1890a97a | 736 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
1da177e4 | 737 | |
c0af4175 | 738 | acpi_free_pnp_ids(&acpi_dev->pnp); |
0b224527 | 739 | acpi_free_power_resources_lists(acpi_dev); |
1890a97a | 740 | kfree(acpi_dev); |
1da177e4 LT |
741 | } |
742 | ||
5d9464a4 | 743 | static int acpi_bus_match(struct device *dev, struct device_driver *drv) |
9e89dde2 | 744 | { |
5d9464a4 PM |
745 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
746 | struct acpi_driver *acpi_drv = to_acpi_driver(drv); | |
1da177e4 | 747 | |
209d3b17 | 748 | return acpi_dev->flags.match_driver |
805d410f | 749 | && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); |
5d9464a4 | 750 | } |
1da177e4 | 751 | |
7eff2e7a | 752 | static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) |
1da177e4 | 753 | { |
5d9464a4 | 754 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
7eff2e7a | 755 | int len; |
5d9464a4 | 756 | |
2b2ae7c7 TR |
757 | if (list_empty(&acpi_dev->pnp.ids)) |
758 | return 0; | |
759 | ||
7eff2e7a KS |
760 | if (add_uevent_var(env, "MODALIAS=")) |
761 | return -ENOMEM; | |
762 | len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], | |
763 | sizeof(env->buf) - env->buflen); | |
764 | if (len >= (sizeof(env->buf) - env->buflen)) | |
765 | return -ENOMEM; | |
766 | env->buflen += len; | |
9e89dde2 | 767 | return 0; |
1da177e4 LT |
768 | } |
769 | ||
46ec8598 BH |
770 | static void acpi_device_notify(acpi_handle handle, u32 event, void *data) |
771 | { | |
772 | struct acpi_device *device = data; | |
773 | ||
774 | device->driver->ops.notify(device, event); | |
775 | } | |
776 | ||
777 | static acpi_status acpi_device_notify_fixed(void *data) | |
778 | { | |
779 | struct acpi_device *device = data; | |
780 | ||
53de5356 BH |
781 | /* Fixed hardware devices have no handles */ |
782 | acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); | |
46ec8598 BH |
783 | return AE_OK; |
784 | } | |
785 | ||
786 | static int acpi_device_install_notify_handler(struct acpi_device *device) | |
787 | { | |
788 | acpi_status status; | |
46ec8598 | 789 | |
ccba2a36 | 790 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 BH |
791 | status = |
792 | acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, | |
793 | acpi_device_notify_fixed, | |
794 | device); | |
ccba2a36 | 795 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 BH |
796 | status = |
797 | acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, | |
798 | acpi_device_notify_fixed, | |
799 | device); | |
800 | else | |
801 | status = acpi_install_notify_handler(device->handle, | |
802 | ACPI_DEVICE_NOTIFY, | |
803 | acpi_device_notify, | |
804 | device); | |
805 | ||
806 | if (ACPI_FAILURE(status)) | |
807 | return -EINVAL; | |
808 | return 0; | |
809 | } | |
810 | ||
811 | static void acpi_device_remove_notify_handler(struct acpi_device *device) | |
812 | { | |
ccba2a36 | 813 | if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) |
46ec8598 BH |
814 | acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, |
815 | acpi_device_notify_fixed); | |
ccba2a36 | 816 | else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) |
46ec8598 BH |
817 | acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, |
818 | acpi_device_notify_fixed); | |
819 | else | |
820 | acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, | |
821 | acpi_device_notify); | |
822 | } | |
823 | ||
d9e455f5 | 824 | static int acpi_device_probe(struct device *dev) |
1da177e4 | 825 | { |
5d9464a4 PM |
826 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
827 | struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); | |
828 | int ret; | |
829 | ||
24071f47 RW |
830 | if (acpi_dev->handler) |
831 | return -EINVAL; | |
832 | ||
d9e455f5 RW |
833 | if (!acpi_drv->ops.add) |
834 | return -ENOSYS; | |
46ec8598 | 835 | |
d9e455f5 RW |
836 | ret = acpi_drv->ops.add(acpi_dev); |
837 | if (ret) | |
838 | return ret; | |
46ec8598 | 839 | |
d9e455f5 RW |
840 | acpi_dev->driver = acpi_drv; |
841 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
842 | "Driver [%s] successfully bound to device [%s]\n", | |
843 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
844 | ||
845 | if (acpi_drv->ops.notify) { | |
846 | ret = acpi_device_install_notify_handler(acpi_dev); | |
847 | if (ret) { | |
848 | if (acpi_drv->ops.remove) | |
849 | acpi_drv->ops.remove(acpi_dev); | |
850 | ||
851 | acpi_dev->driver = NULL; | |
852 | acpi_dev->driver_data = NULL; | |
853 | return ret; | |
854 | } | |
5d9464a4 | 855 | } |
d9e455f5 RW |
856 | |
857 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", | |
858 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
859 | get_device(dev); | |
860 | return 0; | |
5d9464a4 | 861 | } |
1da177e4 | 862 | |
5d9464a4 PM |
863 | static int acpi_device_remove(struct device * dev) |
864 | { | |
865 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
866 | struct acpi_driver *acpi_drv = acpi_dev->driver; | |
867 | ||
868 | if (acpi_drv) { | |
46ec8598 BH |
869 | if (acpi_drv->ops.notify) |
870 | acpi_device_remove_notify_handler(acpi_dev); | |
5d9464a4 | 871 | if (acpi_drv->ops.remove) |
51fac838 | 872 | acpi_drv->ops.remove(acpi_dev); |
1da177e4 | 873 | } |
5d9464a4 | 874 | acpi_dev->driver = NULL; |
db89b4f0 | 875 | acpi_dev->driver_data = NULL; |
1da177e4 | 876 | |
5d9464a4 | 877 | put_device(dev); |
9e89dde2 ZR |
878 | return 0; |
879 | } | |
1da177e4 | 880 | |
55955aad | 881 | struct bus_type acpi_bus_type = { |
9e89dde2 | 882 | .name = "acpi", |
5d9464a4 PM |
883 | .match = acpi_bus_match, |
884 | .probe = acpi_device_probe, | |
885 | .remove = acpi_device_remove, | |
886 | .uevent = acpi_device_uevent, | |
9e89dde2 ZR |
887 | }; |
888 | ||
d783156e RW |
889 | static void acpi_device_del(struct acpi_device *device) |
890 | { | |
891 | mutex_lock(&acpi_device_lock); | |
892 | if (device->parent) | |
893 | list_del(&device->node); | |
894 | ||
895 | list_del(&device->wakeup_list); | |
896 | mutex_unlock(&acpi_device_lock); | |
897 | ||
898 | acpi_power_add_remove_device(device, false); | |
899 | acpi_device_remove_files(device); | |
900 | if (device->remove) | |
901 | device->remove(device); | |
902 | ||
903 | device_del(&device->dev); | |
904 | } | |
905 | ||
906 | static LIST_HEAD(acpi_device_del_list); | |
907 | static DEFINE_MUTEX(acpi_device_del_lock); | |
908 | ||
909 | static void acpi_device_del_work_fn(struct work_struct *work_not_used) | |
910 | { | |
911 | for (;;) { | |
912 | struct acpi_device *adev; | |
913 | ||
914 | mutex_lock(&acpi_device_del_lock); | |
915 | ||
916 | if (list_empty(&acpi_device_del_list)) { | |
917 | mutex_unlock(&acpi_device_del_lock); | |
918 | break; | |
919 | } | |
920 | adev = list_first_entry(&acpi_device_del_list, | |
921 | struct acpi_device, del_list); | |
922 | list_del(&adev->del_list); | |
923 | ||
924 | mutex_unlock(&acpi_device_del_lock); | |
925 | ||
926 | acpi_device_del(adev); | |
927 | /* | |
928 | * Drop references to all power resources that might have been | |
929 | * used by the device. | |
930 | */ | |
931 | acpi_power_transition(adev, ACPI_STATE_D3_COLD); | |
932 | put_device(&adev->dev); | |
933 | } | |
934 | } | |
935 | ||
936 | /** | |
937 | * acpi_scan_drop_device - Drop an ACPI device object. | |
938 | * @handle: Handle of an ACPI namespace node, not used. | |
939 | * @context: Address of the ACPI device object to drop. | |
940 | * | |
941 | * This is invoked by acpi_ns_delete_node() during the removal of the ACPI | |
942 | * namespace node the device object pointed to by @context is attached to. | |
943 | * | |
944 | * The unregistration is carried out asynchronously to avoid running | |
945 | * acpi_device_del() under the ACPICA's namespace mutex and the list is used to | |
946 | * ensure the correct ordering (the device objects must be unregistered in the | |
947 | * same order in which the corresponding namespace nodes are deleted). | |
948 | */ | |
949 | static void acpi_scan_drop_device(acpi_handle handle, void *context) | |
caf5c03f | 950 | { |
d783156e RW |
951 | static DECLARE_WORK(work, acpi_device_del_work_fn); |
952 | struct acpi_device *adev = context; | |
953 | ||
954 | mutex_lock(&acpi_device_del_lock); | |
955 | ||
956 | /* | |
957 | * Use the ACPI hotplug workqueue which is ordered, so this work item | |
958 | * won't run after any hotplug work items submitted subsequently. That | |
959 | * prevents attempts to register device objects identical to those being | |
960 | * deleted from happening concurrently (such attempts result from | |
961 | * hotplug events handled via the ACPI hotplug workqueue). It also will | |
962 | * run after all of the work items submitted previosuly, which helps | |
963 | * those work items to ensure that they are not accessing stale device | |
964 | * objects. | |
965 | */ | |
966 | if (list_empty(&acpi_device_del_list)) | |
967 | acpi_queue_hotplug_work(&work); | |
968 | ||
969 | list_add_tail(&adev->del_list, &acpi_device_del_list); | |
970 | /* Make acpi_ns_validate_handle() return NULL for this handle. */ | |
971 | adev->handle = INVALID_ACPI_HANDLE; | |
972 | ||
973 | mutex_unlock(&acpi_device_del_lock); | |
caf5c03f RW |
974 | } |
975 | ||
976 | int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) | |
977 | { | |
978 | acpi_status status; | |
979 | ||
980 | if (!device) | |
981 | return -EINVAL; | |
982 | ||
d783156e | 983 | status = acpi_get_data(handle, acpi_scan_drop_device, (void **)device); |
caf5c03f RW |
984 | if (ACPI_FAILURE(status) || !*device) { |
985 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", | |
986 | handle)); | |
987 | return -ENODEV; | |
988 | } | |
989 | return 0; | |
990 | } | |
6585925b | 991 | EXPORT_SYMBOL(acpi_bus_get_device); |
caf5c03f | 992 | |
cf860be6 RW |
993 | int acpi_device_add(struct acpi_device *device, |
994 | void (*release)(struct device *)) | |
1da177e4 | 995 | { |
4be44fcd | 996 | int result; |
e49bd2dd ZR |
997 | struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; |
998 | int found = 0; | |
66b7ed40 | 999 | |
d43e167d RW |
1000 | if (device->handle) { |
1001 | acpi_status status; | |
1002 | ||
d783156e | 1003 | status = acpi_attach_data(device->handle, acpi_scan_drop_device, |
d43e167d RW |
1004 | device); |
1005 | if (ACPI_FAILURE(status)) { | |
1006 | acpi_handle_err(device->handle, | |
1007 | "Unable to attach device data\n"); | |
1008 | return -ENODEV; | |
1009 | } | |
1010 | } | |
1011 | ||
9e89dde2 ZR |
1012 | /* |
1013 | * Linkage | |
1014 | * ------- | |
1015 | * Link this device to its parent and siblings. | |
1016 | */ | |
1017 | INIT_LIST_HEAD(&device->children); | |
1018 | INIT_LIST_HEAD(&device->node); | |
9e89dde2 | 1019 | INIT_LIST_HEAD(&device->wakeup_list); |
1033f904 | 1020 | INIT_LIST_HEAD(&device->physical_node_list); |
d783156e | 1021 | INIT_LIST_HEAD(&device->del_list); |
1033f904 | 1022 | mutex_init(&device->physical_node_lock); |
1da177e4 | 1023 | |
e49bd2dd ZR |
1024 | new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); |
1025 | if (!new_bus_id) { | |
d43e167d RW |
1026 | pr_err(PREFIX "Memory allocation error\n"); |
1027 | result = -ENOMEM; | |
1028 | goto err_detach; | |
1da177e4 | 1029 | } |
e49bd2dd | 1030 | |
9090589d | 1031 | mutex_lock(&acpi_device_lock); |
e49bd2dd ZR |
1032 | /* |
1033 | * Find suitable bus_id and instance number in acpi_bus_id_list | |
1034 | * If failed, create one and link it into acpi_bus_id_list | |
1035 | */ | |
1036 | list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { | |
1131b938 BH |
1037 | if (!strcmp(acpi_device_bus_id->bus_id, |
1038 | acpi_device_hid(device))) { | |
1039 | acpi_device_bus_id->instance_no++; | |
e49bd2dd ZR |
1040 | found = 1; |
1041 | kfree(new_bus_id); | |
1042 | break; | |
1043 | } | |
1da177e4 | 1044 | } |
0c526d96 | 1045 | if (!found) { |
e49bd2dd | 1046 | acpi_device_bus_id = new_bus_id; |
1131b938 | 1047 | strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); |
e49bd2dd ZR |
1048 | acpi_device_bus_id->instance_no = 0; |
1049 | list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); | |
1da177e4 | 1050 | } |
0794469d | 1051 | dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); |
1da177e4 | 1052 | |
33b57150 | 1053 | if (device->parent) |
9e89dde2 | 1054 | list_add_tail(&device->node, &device->parent->children); |
33b57150 | 1055 | |
9e89dde2 ZR |
1056 | if (device->wakeup.flags.valid) |
1057 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); | |
9090589d | 1058 | mutex_unlock(&acpi_device_lock); |
1da177e4 | 1059 | |
1890a97a | 1060 | if (device->parent) |
66b7ed40 | 1061 | device->dev.parent = &device->parent->dev; |
1890a97a | 1062 | device->dev.bus = &acpi_bus_type; |
82c7d5ef | 1063 | device->dev.release = release; |
cf860be6 | 1064 | result = device_add(&device->dev); |
0c526d96 | 1065 | if (result) { |
8b12b922 | 1066 | dev_err(&device->dev, "Error registering device\n"); |
d43e167d | 1067 | goto err; |
1da177e4 | 1068 | } |
1da177e4 | 1069 | |
e49bd2dd | 1070 | result = acpi_device_setup_files(device); |
0c526d96 | 1071 | if (result) |
0794469d KS |
1072 | printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", |
1073 | dev_name(&device->dev)); | |
1da177e4 | 1074 | |
1da177e4 | 1075 | return 0; |
d43e167d RW |
1076 | |
1077 | err: | |
9090589d | 1078 | mutex_lock(&acpi_device_lock); |
33b57150 | 1079 | if (device->parent) |
e49bd2dd | 1080 | list_del(&device->node); |
e49bd2dd | 1081 | list_del(&device->wakeup_list); |
9090589d | 1082 | mutex_unlock(&acpi_device_lock); |
d43e167d RW |
1083 | |
1084 | err_detach: | |
d783156e | 1085 | acpi_detach_data(device->handle, acpi_scan_drop_device); |
e49bd2dd | 1086 | return result; |
1da177e4 LT |
1087 | } |
1088 | ||
9e89dde2 ZR |
1089 | /* -------------------------------------------------------------------------- |
1090 | Driver Management | |
1091 | -------------------------------------------------------------------------- */ | |
9e89dde2 ZR |
1092 | /** |
1093 | * acpi_bus_register_driver - register a driver with the ACPI bus | |
1094 | * @driver: driver being registered | |
1095 | * | |
1096 | * Registers a driver with the ACPI bus. Searches the namespace for all | |
1097 | * devices that match the driver's criteria and binds. Returns zero for | |
1098 | * success or a negative error status for failure. | |
1099 | */ | |
1100 | int acpi_bus_register_driver(struct acpi_driver *driver) | |
1da177e4 | 1101 | { |
1890a97a | 1102 | int ret; |
1da177e4 | 1103 | |
9e89dde2 ZR |
1104 | if (acpi_disabled) |
1105 | return -ENODEV; | |
1890a97a PM |
1106 | driver->drv.name = driver->name; |
1107 | driver->drv.bus = &acpi_bus_type; | |
1108 | driver->drv.owner = driver->owner; | |
1da177e4 | 1109 | |
1890a97a PM |
1110 | ret = driver_register(&driver->drv); |
1111 | return ret; | |
9e89dde2 | 1112 | } |
1da177e4 | 1113 | |
9e89dde2 ZR |
1114 | EXPORT_SYMBOL(acpi_bus_register_driver); |
1115 | ||
1116 | /** | |
b27b14ce | 1117 | * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus |
9e89dde2 ZR |
1118 | * @driver: driver to unregister |
1119 | * | |
1120 | * Unregisters a driver with the ACPI bus. Searches the namespace for all | |
1121 | * devices that match the driver's criteria and unbinds. | |
1122 | */ | |
1123 | void acpi_bus_unregister_driver(struct acpi_driver *driver) | |
1124 | { | |
1890a97a | 1125 | driver_unregister(&driver->drv); |
9e89dde2 ZR |
1126 | } |
1127 | ||
1128 | EXPORT_SYMBOL(acpi_bus_unregister_driver); | |
1129 | ||
9e89dde2 ZR |
1130 | /* -------------------------------------------------------------------------- |
1131 | Device Enumeration | |
1132 | -------------------------------------------------------------------------- */ | |
5c478f49 BH |
1133 | static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) |
1134 | { | |
456de893 | 1135 | struct acpi_device *device = NULL; |
5c478f49 | 1136 | acpi_status status; |
5c478f49 BH |
1137 | |
1138 | /* | |
1139 | * Fixed hardware devices do not appear in the namespace and do not | |
1140 | * have handles, but we fabricate acpi_devices for them, so we have | |
1141 | * to deal with them specially. | |
1142 | */ | |
456de893 | 1143 | if (!handle) |
5c478f49 BH |
1144 | return acpi_root; |
1145 | ||
1146 | do { | |
1147 | status = acpi_get_parent(handle, &handle); | |
5c478f49 | 1148 | if (ACPI_FAILURE(status)) |
456de893 RW |
1149 | return status == AE_NULL_ENTRY ? NULL : acpi_root; |
1150 | } while (acpi_bus_get_device(handle, &device)); | |
1151 | return device; | |
5c478f49 BH |
1152 | } |
1153 | ||
9e89dde2 ZR |
1154 | acpi_status |
1155 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) | |
1156 | { | |
1157 | acpi_status status; | |
1158 | acpi_handle tmp; | |
1159 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
1160 | union acpi_object *obj; | |
1161 | ||
1162 | status = acpi_get_handle(handle, "_EJD", &tmp); | |
1163 | if (ACPI_FAILURE(status)) | |
1164 | return status; | |
1165 | ||
1166 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); | |
1167 | if (ACPI_SUCCESS(status)) { | |
1168 | obj = buffer.pointer; | |
3b5fee59 HM |
1169 | status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, |
1170 | ejd); | |
9e89dde2 ZR |
1171 | kfree(buffer.pointer); |
1172 | } | |
1173 | return status; | |
1174 | } | |
1175 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); | |
1176 | ||
e88c9c60 RW |
1177 | static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle, |
1178 | struct acpi_device_wakeup *wakeup) | |
9e89dde2 | 1179 | { |
b581a7f9 RW |
1180 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1181 | union acpi_object *package = NULL; | |
9e89dde2 | 1182 | union acpi_object *element = NULL; |
b581a7f9 | 1183 | acpi_status status; |
e88c9c60 | 1184 | int err = -ENODATA; |
9e89dde2 | 1185 | |
b581a7f9 | 1186 | if (!wakeup) |
e88c9c60 | 1187 | return -EINVAL; |
9e89dde2 | 1188 | |
993cbe59 | 1189 | INIT_LIST_HEAD(&wakeup->resources); |
9e89dde2 | 1190 | |
b581a7f9 RW |
1191 | /* _PRW */ |
1192 | status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); | |
1193 | if (ACPI_FAILURE(status)) { | |
1194 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); | |
e88c9c60 | 1195 | return err; |
b581a7f9 RW |
1196 | } |
1197 | ||
1198 | package = (union acpi_object *)buffer.pointer; | |
1199 | ||
e88c9c60 | 1200 | if (!package || package->package.count < 2) |
b581a7f9 | 1201 | goto out; |
b581a7f9 | 1202 | |
9e89dde2 | 1203 | element = &(package->package.elements[0]); |
e88c9c60 | 1204 | if (!element) |
b581a7f9 | 1205 | goto out; |
e88c9c60 | 1206 | |
9e89dde2 ZR |
1207 | if (element->type == ACPI_TYPE_PACKAGE) { |
1208 | if ((element->package.count < 2) || | |
1209 | (element->package.elements[0].type != | |
1210 | ACPI_TYPE_LOCAL_REFERENCE) | |
e88c9c60 | 1211 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) |
b581a7f9 | 1212 | goto out; |
e88c9c60 | 1213 | |
b581a7f9 | 1214 | wakeup->gpe_device = |
9e89dde2 | 1215 | element->package.elements[0].reference.handle; |
b581a7f9 | 1216 | wakeup->gpe_number = |
9e89dde2 ZR |
1217 | (u32) element->package.elements[1].integer.value; |
1218 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
b581a7f9 RW |
1219 | wakeup->gpe_device = NULL; |
1220 | wakeup->gpe_number = element->integer.value; | |
1221 | } else { | |
b581a7f9 RW |
1222 | goto out; |
1223 | } | |
9e89dde2 ZR |
1224 | |
1225 | element = &(package->package.elements[1]); | |
e88c9c60 | 1226 | if (element->type != ACPI_TYPE_INTEGER) |
b581a7f9 | 1227 | goto out; |
e88c9c60 | 1228 | |
b581a7f9 | 1229 | wakeup->sleep_state = element->integer.value; |
9e89dde2 | 1230 | |
e88c9c60 RW |
1231 | err = acpi_extract_power_resources(package, 2, &wakeup->resources); |
1232 | if (err) | |
b581a7f9 | 1233 | goto out; |
9e89dde2 | 1234 | |
0596a52b RW |
1235 | if (!list_empty(&wakeup->resources)) { |
1236 | int sleep_state; | |
9e89dde2 | 1237 | |
b5d667eb RW |
1238 | err = acpi_power_wakeup_list_init(&wakeup->resources, |
1239 | &sleep_state); | |
1240 | if (err) { | |
1241 | acpi_handle_warn(handle, "Retrieving current states " | |
1242 | "of wakeup power resources failed\n"); | |
1243 | acpi_power_resources_list_free(&wakeup->resources); | |
1244 | goto out; | |
1245 | } | |
0596a52b RW |
1246 | if (sleep_state < wakeup->sleep_state) { |
1247 | acpi_handle_warn(handle, "Overriding _PRW sleep state " | |
1248 | "(S%d) by S%d from power resources\n", | |
1249 | (int)wakeup->sleep_state, sleep_state); | |
1250 | wakeup->sleep_state = sleep_state; | |
1251 | } | |
1252 | } | |
bba63a29 | 1253 | acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number); |
9874647b | 1254 | |
b581a7f9 RW |
1255 | out: |
1256 | kfree(buffer.pointer); | |
e88c9c60 | 1257 | return err; |
1da177e4 LT |
1258 | } |
1259 | ||
f517709d | 1260 | static void acpi_bus_set_run_wake_flags(struct acpi_device *device) |
1da177e4 | 1261 | { |
29b71a1c | 1262 | struct acpi_device_id button_device_ids[] = { |
29b71a1c | 1263 | {"PNP0C0C", 0}, |
b7e38304 | 1264 | {"PNP0C0D", 0}, |
29b71a1c TR |
1265 | {"PNP0C0E", 0}, |
1266 | {"", 0}, | |
1267 | }; | |
f517709d RW |
1268 | acpi_status status; |
1269 | acpi_event_status event_status; | |
1270 | ||
b67ea761 | 1271 | device->wakeup.flags.notifier_present = 0; |
f517709d RW |
1272 | |
1273 | /* Power button, Lid switch always enable wakeup */ | |
1274 | if (!acpi_match_device_ids(device, button_device_ids)) { | |
1275 | device->wakeup.flags.run_wake = 1; | |
b7e38304 ZR |
1276 | if (!acpi_match_device_ids(device, &button_device_ids[1])) { |
1277 | /* Do not use Lid/sleep button for S5 wakeup */ | |
1278 | if (device->wakeup.sleep_state == ACPI_STATE_S5) | |
1279 | device->wakeup.sleep_state = ACPI_STATE_S4; | |
1280 | } | |
f2b56bc8 | 1281 | device_set_wakeup_capable(&device->dev, true); |
f517709d RW |
1282 | return; |
1283 | } | |
1284 | ||
e8e18c95 RW |
1285 | status = acpi_get_gpe_status(device->wakeup.gpe_device, |
1286 | device->wakeup.gpe_number, | |
1287 | &event_status); | |
f517709d RW |
1288 | if (status == AE_OK) |
1289 | device->wakeup.flags.run_wake = | |
1290 | !!(event_status & ACPI_EVENT_FLAG_HANDLE); | |
1291 | } | |
1292 | ||
d57d09a4 | 1293 | static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
f517709d | 1294 | { |
e88c9c60 | 1295 | int err; |
29b71a1c | 1296 | |
d57d09a4 | 1297 | /* Presence of _PRW indicates wake capable */ |
952c63e9 | 1298 | if (!acpi_has_method(device->handle, "_PRW")) |
d57d09a4 RW |
1299 | return; |
1300 | ||
e88c9c60 RW |
1301 | err = acpi_bus_extract_wakeup_device_power_package(device->handle, |
1302 | &device->wakeup); | |
1303 | if (err) { | |
1304 | dev_err(&device->dev, "_PRW evaluation error: %d\n", err); | |
d57d09a4 | 1305 | return; |
9e89dde2 | 1306 | } |
1da177e4 | 1307 | |
9e89dde2 | 1308 | device->wakeup.flags.valid = 1; |
9b83ccd2 | 1309 | device->wakeup.prepare_count = 0; |
f517709d | 1310 | acpi_bus_set_run_wake_flags(device); |
729b2bdb ZY |
1311 | /* Call _PSW/_DSW object to disable its ability to wake the sleeping |
1312 | * system for the ACPI device with the _PRW object. | |
1313 | * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. | |
1314 | * So it is necessary to call _DSW object first. Only when it is not | |
1315 | * present will the _PSW object used. | |
1316 | */ | |
e88c9c60 RW |
1317 | err = acpi_device_sleep_wake(device, 0, 0, 0); |
1318 | if (err) | |
77e76609 RW |
1319 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
1320 | "error in _DSW or _PSW evaluation\n")); | |
1da177e4 | 1321 | } |
1da177e4 | 1322 | |
f33ce568 RW |
1323 | static void acpi_bus_init_power_state(struct acpi_device *device, int state) |
1324 | { | |
1325 | struct acpi_device_power_state *ps = &device->power.states[state]; | |
ef85bdbe RW |
1326 | char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; |
1327 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
f33ce568 | 1328 | acpi_status status; |
bf325f95 | 1329 | |
f33ce568 RW |
1330 | INIT_LIST_HEAD(&ps->resources); |
1331 | ||
ef85bdbe RW |
1332 | /* Evaluate "_PRx" to get referenced power resources */ |
1333 | status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); | |
1334 | if (ACPI_SUCCESS(status)) { | |
1335 | union acpi_object *package = buffer.pointer; | |
1336 | ||
1337 | if (buffer.length && package | |
1338 | && package->type == ACPI_TYPE_PACKAGE | |
1339 | && package->package.count) { | |
e88c9c60 RW |
1340 | int err = acpi_extract_power_resources(package, 0, |
1341 | &ps->resources); | |
1342 | if (!err) | |
ef85bdbe | 1343 | device->power.flags.power_resources = 1; |
f33ce568 | 1344 | } |
ef85bdbe | 1345 | ACPI_FREE(buffer.pointer); |
f33ce568 RW |
1346 | } |
1347 | ||
1348 | /* Evaluate "_PSx" to see if we can do explicit sets */ | |
ef85bdbe | 1349 | pathname[2] = 'S'; |
952c63e9 | 1350 | if (acpi_has_method(device->handle, pathname)) |
f33ce568 RW |
1351 | ps->flags.explicit_set = 1; |
1352 | ||
1353 | /* | |
1354 | * State is valid if there are means to put the device into it. | |
1355 | * D3hot is only valid if _PR3 present. | |
1356 | */ | |
ef85bdbe | 1357 | if (!list_empty(&ps->resources) |
f33ce568 RW |
1358 | || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) { |
1359 | ps->flags.valid = 1; | |
1360 | ps->flags.os_accessible = 1; | |
1361 | } | |
1362 | ||
1363 | ps->power = -1; /* Unknown - driver assigned */ | |
1364 | ps->latency = -1; /* Unknown - driver assigned */ | |
1365 | } | |
1366 | ||
d43e167d | 1367 | static void acpi_bus_get_power_flags(struct acpi_device *device) |
1da177e4 | 1368 | { |
8bc5053b | 1369 | u32 i; |
1a365616 | 1370 | |
d43e167d | 1371 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ |
952c63e9 JL |
1372 | if (!acpi_has_method(device->handle, "_PS0") && |
1373 | !acpi_has_method(device->handle, "_PR0")) | |
1374 | return; | |
1a365616 | 1375 | |
d43e167d | 1376 | device->flags.power_manageable = 1; |
4be44fcd | 1377 | |
9e89dde2 ZR |
1378 | /* |
1379 | * Power Management Flags | |
1380 | */ | |
952c63e9 | 1381 | if (acpi_has_method(device->handle, "_PSC")) |
9e89dde2 | 1382 | device->power.flags.explicit_get = 1; |
952c63e9 | 1383 | if (acpi_has_method(device->handle, "_IRC")) |
9e89dde2 | 1384 | device->power.flags.inrush_current = 1; |
1da177e4 | 1385 | |
9e89dde2 ZR |
1386 | /* |
1387 | * Enumerate supported power management states | |
1388 | */ | |
f33ce568 RW |
1389 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) |
1390 | acpi_bus_init_power_state(device, i); | |
bf325f95 | 1391 | |
0b224527 | 1392 | INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); |
1da177e4 | 1393 | |
9e89dde2 ZR |
1394 | /* Set defaults for D0 and D3 states (always valid) */ |
1395 | device->power.states[ACPI_STATE_D0].flags.valid = 1; | |
1396 | device->power.states[ACPI_STATE_D0].power = 100; | |
8ad928d5 RW |
1397 | device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; |
1398 | device->power.states[ACPI_STATE_D3_COLD].power = 0; | |
c8f7a62c | 1399 | |
5c7dd710 RW |
1400 | /* Set D3cold's explicit_set flag if _PS3 exists. */ |
1401 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set) | |
1402 | device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1; | |
1403 | ||
1399dfcd AL |
1404 | /* Presence of _PS3 or _PRx means we can put the device into D3 cold */ |
1405 | if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set || | |
1406 | device->power.flags.power_resources) | |
1407 | device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1; | |
1408 | ||
b3785492 RW |
1409 | if (acpi_bus_init_power(device)) { |
1410 | acpi_free_power_resources_lists(device); | |
1411 | device->flags.power_manageable = 0; | |
1412 | } | |
9e89dde2 | 1413 | } |
c8f7a62c | 1414 | |
d43e167d | 1415 | static void acpi_bus_get_flags(struct acpi_device *device) |
1da177e4 | 1416 | { |
1da177e4 | 1417 | /* Presence of _STA indicates 'dynamic_status' */ |
952c63e9 | 1418 | if (acpi_has_method(device->handle, "_STA")) |
1da177e4 LT |
1419 | device->flags.dynamic_status = 1; |
1420 | ||
1da177e4 | 1421 | /* Presence of _RMV indicates 'removable' */ |
952c63e9 | 1422 | if (acpi_has_method(device->handle, "_RMV")) |
1da177e4 LT |
1423 | device->flags.removable = 1; |
1424 | ||
1425 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ | |
952c63e9 JL |
1426 | if (acpi_has_method(device->handle, "_EJD") || |
1427 | acpi_has_method(device->handle, "_EJ0")) | |
1da177e4 | 1428 | device->flags.ejectable = 1; |
1da177e4 LT |
1429 | } |
1430 | ||
c7bcb4e9 | 1431 | static void acpi_device_get_busid(struct acpi_device *device) |
1da177e4 | 1432 | { |
4be44fcd LB |
1433 | char bus_id[5] = { '?', 0 }; |
1434 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; | |
1435 | int i = 0; | |
1da177e4 LT |
1436 | |
1437 | /* | |
1438 | * Bus ID | |
1439 | * ------ | |
1440 | * The device's Bus ID is simply the object name. | |
1441 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? | |
1442 | */ | |
859ac9a4 | 1443 | if (ACPI_IS_ROOT_DEVICE(device)) { |
1da177e4 | 1444 | strcpy(device->pnp.bus_id, "ACPI"); |
859ac9a4 BH |
1445 | return; |
1446 | } | |
1447 | ||
1448 | switch (device->device_type) { | |
1da177e4 LT |
1449 | case ACPI_BUS_TYPE_POWER_BUTTON: |
1450 | strcpy(device->pnp.bus_id, "PWRF"); | |
1451 | break; | |
1452 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
1453 | strcpy(device->pnp.bus_id, "SLPF"); | |
1454 | break; | |
1455 | default: | |
66b7ed40 | 1456 | acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); |
1da177e4 LT |
1457 | /* Clean up trailing underscores (if any) */ |
1458 | for (i = 3; i > 1; i--) { | |
1459 | if (bus_id[i] == '_') | |
1460 | bus_id[i] = '\0'; | |
1461 | else | |
1462 | break; | |
1463 | } | |
1464 | strcpy(device->pnp.bus_id, bus_id); | |
1465 | break; | |
1466 | } | |
1467 | } | |
1468 | ||
ebf4df8d JL |
1469 | /* |
1470 | * acpi_ata_match - see if an acpi object is an ATA device | |
1471 | * | |
1472 | * If an acpi object has one of the ACPI ATA methods defined, | |
1473 | * then we can safely call it an ATA device. | |
1474 | */ | |
1475 | bool acpi_ata_match(acpi_handle handle) | |
1476 | { | |
1477 | return acpi_has_method(handle, "_GTF") || | |
1478 | acpi_has_method(handle, "_GTM") || | |
1479 | acpi_has_method(handle, "_STM") || | |
1480 | acpi_has_method(handle, "_SDD"); | |
1481 | } | |
1482 | ||
54735266 | 1483 | /* |
d4e1a692 | 1484 | * acpi_bay_match - see if an acpi object is an ejectable driver bay |
54735266 ZR |
1485 | * |
1486 | * If an acpi object is ejectable and has one of the ACPI ATA methods defined, | |
1487 | * then we can safely call it an ejectable drive bay | |
1488 | */ | |
ebf4df8d | 1489 | bool acpi_bay_match(acpi_handle handle) |
d4e1a692 | 1490 | { |
54735266 ZR |
1491 | acpi_handle phandle; |
1492 | ||
952c63e9 | 1493 | if (!acpi_has_method(handle, "_EJ0")) |
ebf4df8d JL |
1494 | return false; |
1495 | if (acpi_ata_match(handle)) | |
1496 | return true; | |
1497 | if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) | |
1498 | return false; | |
54735266 | 1499 | |
ebf4df8d | 1500 | return acpi_ata_match(phandle); |
54735266 ZR |
1501 | } |
1502 | ||
3620f2f2 | 1503 | /* |
d4e1a692 | 1504 | * acpi_dock_match - see if an acpi object has a _DCK method |
3620f2f2 | 1505 | */ |
ebf4df8d | 1506 | bool acpi_dock_match(acpi_handle handle) |
3620f2f2 | 1507 | { |
ebf4df8d | 1508 | return acpi_has_method(handle, "_DCK"); |
3620f2f2 FS |
1509 | } |
1510 | ||
620e112c | 1511 | const char *acpi_device_hid(struct acpi_device *device) |
15b8dd53 | 1512 | { |
7f47fa6c | 1513 | struct acpi_hardware_id *hid; |
15b8dd53 | 1514 | |
2b2ae7c7 TR |
1515 | if (list_empty(&device->pnp.ids)) |
1516 | return dummy_hid; | |
1517 | ||
7f47fa6c BH |
1518 | hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); |
1519 | return hid->id; | |
1520 | } | |
1521 | EXPORT_SYMBOL(acpi_device_hid); | |
15b8dd53 | 1522 | |
d4e1a692 | 1523 | static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) |
7f47fa6c BH |
1524 | { |
1525 | struct acpi_hardware_id *id; | |
15b8dd53 | 1526 | |
7f47fa6c BH |
1527 | id = kmalloc(sizeof(*id), GFP_KERNEL); |
1528 | if (!id) | |
1529 | return; | |
15b8dd53 | 1530 | |
581de59e | 1531 | id->id = kstrdup(dev_id, GFP_KERNEL); |
7f47fa6c BH |
1532 | if (!id->id) { |
1533 | kfree(id); | |
1534 | return; | |
15b8dd53 BM |
1535 | } |
1536 | ||
d4e1a692 TK |
1537 | list_add_tail(&id->list, &pnp->ids); |
1538 | pnp->type.hardware_id = 1; | |
15b8dd53 BM |
1539 | } |
1540 | ||
222e82ac DW |
1541 | /* |
1542 | * Old IBM workstations have a DSDT bug wherein the SMBus object | |
1543 | * lacks the SMBUS01 HID and the methods do not have the necessary "_" | |
1544 | * prefix. Work around this. | |
1545 | */ | |
ebf4df8d | 1546 | static bool acpi_ibm_smbus_match(acpi_handle handle) |
222e82ac | 1547 | { |
ebf4df8d JL |
1548 | char node_name[ACPI_PATH_SEGMENT_LENGTH]; |
1549 | struct acpi_buffer path = { sizeof(node_name), node_name }; | |
222e82ac DW |
1550 | |
1551 | if (!dmi_name_in_vendors("IBM")) | |
ebf4df8d | 1552 | return false; |
222e82ac DW |
1553 | |
1554 | /* Look for SMBS object */ | |
ebf4df8d JL |
1555 | if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || |
1556 | strcmp("SMBS", path.pointer)) | |
1557 | return false; | |
222e82ac DW |
1558 | |
1559 | /* Does it have the necessary (but misnamed) methods? */ | |
952c63e9 JL |
1560 | if (acpi_has_method(handle, "SBI") && |
1561 | acpi_has_method(handle, "SBR") && | |
1562 | acpi_has_method(handle, "SBW")) | |
ebf4df8d JL |
1563 | return true; |
1564 | ||
1565 | return false; | |
222e82ac DW |
1566 | } |
1567 | ||
c0af4175 TK |
1568 | static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, |
1569 | int device_type) | |
1da177e4 | 1570 | { |
4be44fcd | 1571 | acpi_status status; |
57f3674f | 1572 | struct acpi_device_info *info; |
78e25fef | 1573 | struct acpi_pnp_device_id_list *cid_list; |
7f47fa6c | 1574 | int i; |
1da177e4 | 1575 | |
c0af4175 | 1576 | switch (device_type) { |
1da177e4 | 1577 | case ACPI_BUS_TYPE_DEVICE: |
c0af4175 TK |
1578 | if (handle == ACPI_ROOT_OBJECT) { |
1579 | acpi_add_id(pnp, ACPI_SYSTEM_HID); | |
859ac9a4 BH |
1580 | break; |
1581 | } | |
1582 | ||
c0af4175 | 1583 | status = acpi_get_object_info(handle, &info); |
1da177e4 | 1584 | if (ACPI_FAILURE(status)) { |
c0af4175 TK |
1585 | pr_err(PREFIX "%s: Error reading device info\n", |
1586 | __func__); | |
1da177e4 LT |
1587 | return; |
1588 | } | |
1589 | ||
1da177e4 | 1590 | if (info->valid & ACPI_VALID_HID) |
c0af4175 | 1591 | acpi_add_id(pnp, info->hardware_id.string); |
57f3674f | 1592 | if (info->valid & ACPI_VALID_CID) { |
15b8dd53 | 1593 | cid_list = &info->compatible_id_list; |
57f3674f | 1594 | for (i = 0; i < cid_list->count; i++) |
c0af4175 | 1595 | acpi_add_id(pnp, cid_list->ids[i].string); |
57f3674f | 1596 | } |
1da177e4 | 1597 | if (info->valid & ACPI_VALID_ADR) { |
c0af4175 TK |
1598 | pnp->bus_address = info->address; |
1599 | pnp->type.bus_address = 1; | |
1da177e4 | 1600 | } |
ccf78040 | 1601 | if (info->valid & ACPI_VALID_UID) |
c0af4175 | 1602 | pnp->unique_id = kstrdup(info->unique_id.string, |
ccf78040 | 1603 | GFP_KERNEL); |
ae843332 | 1604 | |
a83893ae BH |
1605 | kfree(info); |
1606 | ||
57f3674f BH |
1607 | /* |
1608 | * Some devices don't reliably have _HIDs & _CIDs, so add | |
1609 | * synthetic HIDs to make sure drivers can find them. | |
1610 | */ | |
c0af4175 TK |
1611 | if (acpi_is_video_device(handle)) |
1612 | acpi_add_id(pnp, ACPI_VIDEO_HID); | |
ebf4df8d | 1613 | else if (acpi_bay_match(handle)) |
c0af4175 | 1614 | acpi_add_id(pnp, ACPI_BAY_HID); |
ebf4df8d | 1615 | else if (acpi_dock_match(handle)) |
c0af4175 | 1616 | acpi_add_id(pnp, ACPI_DOCK_HID); |
ebf4df8d | 1617 | else if (acpi_ibm_smbus_match(handle)) |
c0af4175 TK |
1618 | acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); |
1619 | else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) { | |
1620 | acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */ | |
1621 | strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); | |
1622 | strcpy(pnp->device_class, ACPI_BUS_CLASS); | |
b7b30de5 | 1623 | } |
54735266 | 1624 | |
1da177e4 LT |
1625 | break; |
1626 | case ACPI_BUS_TYPE_POWER: | |
c0af4175 | 1627 | acpi_add_id(pnp, ACPI_POWER_HID); |
1da177e4 LT |
1628 | break; |
1629 | case ACPI_BUS_TYPE_PROCESSOR: | |
c0af4175 | 1630 | acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); |
1da177e4 | 1631 | break; |
1da177e4 | 1632 | case ACPI_BUS_TYPE_THERMAL: |
c0af4175 | 1633 | acpi_add_id(pnp, ACPI_THERMAL_HID); |
1da177e4 LT |
1634 | break; |
1635 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
c0af4175 | 1636 | acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); |
1da177e4 LT |
1637 | break; |
1638 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
c0af4175 | 1639 | acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); |
1da177e4 LT |
1640 | break; |
1641 | } | |
1da177e4 LT |
1642 | } |
1643 | ||
c0af4175 TK |
1644 | void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) |
1645 | { | |
1646 | struct acpi_hardware_id *id, *tmp; | |
1647 | ||
1648 | list_for_each_entry_safe(id, tmp, &pnp->ids, list) { | |
1649 | kfree(id->id); | |
1650 | kfree(id); | |
1651 | } | |
1652 | kfree(pnp->unique_id); | |
1653 | } | |
1654 | ||
82c7d5ef RW |
1655 | void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, |
1656 | int type, unsigned long long sta) | |
1da177e4 | 1657 | { |
d43e167d RW |
1658 | INIT_LIST_HEAD(&device->pnp.ids); |
1659 | device->device_type = type; | |
1660 | device->handle = handle; | |
1661 | device->parent = acpi_bus_get_parent(handle); | |
1662 | STRUCT_TO_INT(device->status) = sta; | |
1663 | acpi_device_get_busid(device); | |
c0af4175 | 1664 | acpi_set_pnp_ids(handle, &device->pnp, type); |
d43e167d | 1665 | acpi_bus_get_flags(device); |
2c0d4fe0 | 1666 | device->flags.match_driver = false; |
202317a5 RW |
1667 | device->flags.initialized = true; |
1668 | device->flags.visited = false; | |
cf860be6 RW |
1669 | device_initialize(&device->dev); |
1670 | dev_set_uevent_suppress(&device->dev, true); | |
1671 | } | |
bc3b0772 | 1672 | |
cf860be6 RW |
1673 | void acpi_device_add_finalize(struct acpi_device *device) |
1674 | { | |
1675 | dev_set_uevent_suppress(&device->dev, false); | |
1676 | kobject_uevent(&device->dev.kobj, KOBJ_ADD); | |
1da177e4 LT |
1677 | } |
1678 | ||
5c478f49 BH |
1679 | static int acpi_add_single_object(struct acpi_device **child, |
1680 | acpi_handle handle, int type, | |
2c0d4fe0 | 1681 | unsigned long long sta) |
1da177e4 | 1682 | { |
77c24888 BH |
1683 | int result; |
1684 | struct acpi_device *device; | |
29aaefa6 | 1685 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
1da177e4 | 1686 | |
36bcbec7 | 1687 | device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); |
1da177e4 | 1688 | if (!device) { |
6468463a | 1689 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
d550d98d | 1690 | return -ENOMEM; |
1da177e4 | 1691 | } |
1da177e4 | 1692 | |
d43e167d RW |
1693 | acpi_init_device_object(device, handle, type, sta); |
1694 | acpi_bus_get_power_flags(device); | |
d57d09a4 | 1695 | acpi_bus_get_wakeup_device_flags(device); |
1da177e4 | 1696 | |
cf860be6 | 1697 | result = acpi_device_add(device, acpi_device_release); |
d43e167d | 1698 | if (result) { |
718fb0de | 1699 | acpi_device_release(&device->dev); |
d43e167d RW |
1700 | return result; |
1701 | } | |
1da177e4 | 1702 | |
d43e167d | 1703 | acpi_power_add_remove_device(device, true); |
cf860be6 | 1704 | acpi_device_add_finalize(device); |
d43e167d RW |
1705 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); |
1706 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n", | |
1707 | dev_name(&device->dev), (char *) buffer.pointer, | |
1708 | device->parent ? dev_name(&device->parent->dev) : "(null)")); | |
1709 | kfree(buffer.pointer); | |
1710 | *child = device; | |
1711 | return 0; | |
bf325f95 RW |
1712 | } |
1713 | ||
778cbc1d BH |
1714 | static int acpi_bus_type_and_status(acpi_handle handle, int *type, |
1715 | unsigned long long *sta) | |
1da177e4 | 1716 | { |
778cbc1d BH |
1717 | acpi_status status; |
1718 | acpi_object_type acpi_type; | |
1da177e4 | 1719 | |
778cbc1d | 1720 | status = acpi_get_type(handle, &acpi_type); |
51a85faf | 1721 | if (ACPI_FAILURE(status)) |
778cbc1d | 1722 | return -ENODEV; |
4be44fcd | 1723 | |
778cbc1d | 1724 | switch (acpi_type) { |
51a85faf BH |
1725 | case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ |
1726 | case ACPI_TYPE_DEVICE: | |
778cbc1d BH |
1727 | *type = ACPI_BUS_TYPE_DEVICE; |
1728 | status = acpi_bus_get_status_handle(handle, sta); | |
1729 | if (ACPI_FAILURE(status)) | |
1730 | return -ENODEV; | |
51a85faf BH |
1731 | break; |
1732 | case ACPI_TYPE_PROCESSOR: | |
778cbc1d BH |
1733 | *type = ACPI_BUS_TYPE_PROCESSOR; |
1734 | status = acpi_bus_get_status_handle(handle, sta); | |
1735 | if (ACPI_FAILURE(status)) | |
1736 | return -ENODEV; | |
51a85faf BH |
1737 | break; |
1738 | case ACPI_TYPE_THERMAL: | |
778cbc1d BH |
1739 | *type = ACPI_BUS_TYPE_THERMAL; |
1740 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1741 | break; |
1742 | case ACPI_TYPE_POWER: | |
778cbc1d BH |
1743 | *type = ACPI_BUS_TYPE_POWER; |
1744 | *sta = ACPI_STA_DEFAULT; | |
51a85faf BH |
1745 | break; |
1746 | default: | |
778cbc1d | 1747 | return -ENODEV; |
51a85faf | 1748 | } |
1da177e4 | 1749 | |
778cbc1d BH |
1750 | return 0; |
1751 | } | |
1752 | ||
202317a5 RW |
1753 | bool acpi_device_is_present(struct acpi_device *adev) |
1754 | { | |
1755 | if (adev->status.present || adev->status.functional) | |
1756 | return true; | |
1757 | ||
1758 | adev->flags.initialized = false; | |
1759 | return false; | |
1760 | } | |
1761 | ||
4b59cc1f RW |
1762 | static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, |
1763 | char *idstr, | |
1764 | const struct acpi_device_id **matchid) | |
1765 | { | |
1766 | const struct acpi_device_id *devid; | |
1767 | ||
1768 | for (devid = handler->ids; devid->id[0]; devid++) | |
1769 | if (!strcmp((char *)devid->id, idstr)) { | |
1770 | if (matchid) | |
1771 | *matchid = devid; | |
1772 | ||
1773 | return true; | |
1774 | } | |
1775 | ||
1776 | return false; | |
1777 | } | |
1778 | ||
6b772e8f TK |
1779 | static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr, |
1780 | const struct acpi_device_id **matchid) | |
1781 | { | |
1782 | struct acpi_scan_handler *handler; | |
1783 | ||
1784 | list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) | |
1785 | if (acpi_scan_handler_matching(handler, idstr, matchid)) | |
1786 | return handler; | |
1787 | ||
1788 | return NULL; | |
1789 | } | |
1790 | ||
3f8055c3 RW |
1791 | void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) |
1792 | { | |
3f8055c3 RW |
1793 | if (!!hotplug->enabled == !!val) |
1794 | return; | |
1795 | ||
1796 | mutex_lock(&acpi_scan_lock); | |
1797 | ||
1798 | hotplug->enabled = val; | |
3f8055c3 RW |
1799 | |
1800 | mutex_unlock(&acpi_scan_lock); | |
1801 | } | |
1802 | ||
6b772e8f | 1803 | static void acpi_scan_init_hotplug(acpi_handle handle, int type) |
a33ec399 | 1804 | { |
6b772e8f TK |
1805 | struct acpi_device_pnp pnp = {}; |
1806 | struct acpi_hardware_id *hwid; | |
a33ec399 RW |
1807 | struct acpi_scan_handler *handler; |
1808 | ||
6b772e8f TK |
1809 | INIT_LIST_HEAD(&pnp.ids); |
1810 | acpi_set_pnp_ids(handle, &pnp, type); | |
a33ec399 | 1811 | |
6b772e8f | 1812 | if (!pnp.type.hardware_id) |
7a26b530 | 1813 | goto out; |
a33ec399 RW |
1814 | |
1815 | /* | |
1816 | * This relies on the fact that acpi_install_notify_handler() will not | |
1817 | * install the same notify handler routine twice for the same handle. | |
1818 | */ | |
6b772e8f TK |
1819 | list_for_each_entry(hwid, &pnp.ids, list) { |
1820 | handler = acpi_scan_match_handler(hwid->id, NULL); | |
ca499fc8 | 1821 | if (handler && !handler->hotplug.ignore) { |
2cbb14fb TK |
1822 | acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, |
1823 | acpi_hotplug_notify_cb, handler); | |
6b772e8f TK |
1824 | break; |
1825 | } | |
1826 | } | |
1827 | ||
7a26b530 | 1828 | out: |
6b772e8f | 1829 | acpi_free_pnp_ids(&pnp); |
a33ec399 RW |
1830 | } |
1831 | ||
e3863094 RW |
1832 | static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, |
1833 | void *not_used, void **return_value) | |
778cbc1d | 1834 | { |
805d410f | 1835 | struct acpi_device *device = NULL; |
778cbc1d BH |
1836 | int type; |
1837 | unsigned long long sta; | |
1838 | int result; | |
1839 | ||
4002bf38 RW |
1840 | acpi_bus_get_device(handle, &device); |
1841 | if (device) | |
1842 | goto out; | |
1843 | ||
778cbc1d BH |
1844 | result = acpi_bus_type_and_status(handle, &type, &sta); |
1845 | if (result) | |
1846 | return AE_OK; | |
1847 | ||
82c7d5ef RW |
1848 | if (type == ACPI_BUS_TYPE_POWER) { |
1849 | acpi_add_power_resource(handle); | |
1850 | return AE_OK; | |
1851 | } | |
1852 | ||
6b772e8f | 1853 | acpi_scan_init_hotplug(handle, type); |
a33ec399 | 1854 | |
2c0d4fe0 | 1855 | acpi_add_single_object(&device, handle, type, sta); |
e3b87f8a | 1856 | if (!device) |
51a85faf | 1857 | return AE_CTRL_DEPTH; |
1da177e4 | 1858 | |
4002bf38 | 1859 | out: |
51a85faf BH |
1860 | if (!*return_value) |
1861 | *return_value = device; | |
805d410f | 1862 | |
51a85faf BH |
1863 | return AE_OK; |
1864 | } | |
3fb02738 | 1865 | |
c5698074 | 1866 | static int acpi_scan_attach_handler(struct acpi_device *device) |
ca589f94 | 1867 | { |
c5698074 RW |
1868 | struct acpi_hardware_id *hwid; |
1869 | int ret = 0; | |
ca589f94 | 1870 | |
c5698074 | 1871 | list_for_each_entry(hwid, &device->pnp.ids, list) { |
87b85b3c | 1872 | const struct acpi_device_id *devid; |
c5698074 | 1873 | struct acpi_scan_handler *handler; |
ca589f94 | 1874 | |
c5698074 RW |
1875 | handler = acpi_scan_match_handler(hwid->id, &devid); |
1876 | if (handler) { | |
87b85b3c RW |
1877 | ret = handler->attach(device, devid); |
1878 | if (ret > 0) { | |
1879 | device->handler = handler; | |
c5698074 | 1880 | break; |
87b85b3c | 1881 | } else if (ret < 0) { |
c5698074 | 1882 | break; |
87b85b3c | 1883 | } |
ca589f94 RW |
1884 | } |
1885 | } | |
1886 | return ret; | |
1887 | } | |
1888 | ||
0fc300b0 RW |
1889 | static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used, |
1890 | void *not_used, void **ret_not_used) | |
51a85faf | 1891 | { |
805d410f | 1892 | struct acpi_device *device; |
202317a5 | 1893 | unsigned long long sta; |
ca589f94 | 1894 | int ret; |
3fb02738 | 1895 | |
805d410f RW |
1896 | /* |
1897 | * Ignore errors ignored by acpi_bus_check_add() to avoid terminating | |
1898 | * namespace walks prematurely. | |
1899 | */ | |
202317a5 | 1900 | if (acpi_bus_type_and_status(handle, &ret, &sta)) |
805d410f | 1901 | return AE_OK; |
1da177e4 | 1902 | |
805d410f RW |
1903 | if (acpi_bus_get_device(handle, &device)) |
1904 | return AE_CTRL_DEPTH; | |
7779688f | 1905 | |
202317a5 RW |
1906 | STRUCT_TO_INT(device->status) = sta; |
1907 | /* Skip devices that are not present. */ | |
1908 | if (!acpi_device_is_present(device)) | |
1909 | goto err; | |
1910 | ||
3a391a39 RW |
1911 | if (device->handler) |
1912 | return AE_OK; | |
1913 | ||
202317a5 RW |
1914 | if (!device->flags.initialized) { |
1915 | acpi_bus_update_power(device, NULL); | |
1916 | device->flags.initialized = true; | |
1917 | } | |
ca589f94 | 1918 | ret = acpi_scan_attach_handler(device); |
6931007c | 1919 | if (ret < 0) |
202317a5 | 1920 | goto err; |
6931007c RW |
1921 | |
1922 | device->flags.match_driver = true; | |
1923 | if (ret > 0) | |
202317a5 | 1924 | goto ok; |
ca589f94 RW |
1925 | |
1926 | ret = device_attach(&device->dev); | |
202317a5 RW |
1927 | if (ret < 0) |
1928 | goto err; | |
1929 | ||
1930 | ok: | |
1931 | device->flags.visited = true; | |
1932 | return AE_OK; | |
1933 | ||
1934 | err: | |
1935 | device->flags.visited = false; | |
1936 | return AE_CTRL_DEPTH; | |
1da177e4 | 1937 | } |
1da177e4 | 1938 | |
636458de | 1939 | /** |
b8bd759a | 1940 | * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. |
636458de | 1941 | * @handle: Root of the namespace scope to scan. |
7779688f | 1942 | * |
636458de RW |
1943 | * Scan a given ACPI tree (probably recently hot-plugged) and create and add |
1944 | * found devices. | |
7779688f | 1945 | * |
636458de RW |
1946 | * If no devices were found, -ENODEV is returned, but it does not mean that |
1947 | * there has been a real error. There just have been no suitable ACPI objects | |
1948 | * in the table trunk from which the kernel could create a device and add an | |
1949 | * appropriate driver. | |
3757b948 RW |
1950 | * |
1951 | * Must be called under acpi_scan_lock. | |
7779688f | 1952 | */ |
b8bd759a | 1953 | int acpi_bus_scan(acpi_handle handle) |
3fb02738 | 1954 | { |
b8bd759a | 1955 | void *device = NULL; |
c511cc19 | 1956 | int error = 0; |
3fb02738 | 1957 | |
b8bd759a RW |
1958 | if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device))) |
1959 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, | |
1960 | acpi_bus_check_add, NULL, NULL, &device); | |
3fb02738 | 1961 | |
d2f6650a | 1962 | if (!device) |
c511cc19 RW |
1963 | error = -ENODEV; |
1964 | else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL))) | |
b8bd759a RW |
1965 | acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, |
1966 | acpi_bus_device_attach, NULL, NULL, NULL); | |
3fb02738 | 1967 | |
c511cc19 | 1968 | return error; |
3fb02738 | 1969 | } |
b8bd759a | 1970 | EXPORT_SYMBOL(acpi_bus_scan); |
a2100801 | 1971 | |
05404d8f RW |
1972 | static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used, |
1973 | void *not_used, void **ret_not_used) | |
1974 | { | |
1975 | struct acpi_device *device = NULL; | |
a2100801 | 1976 | |
05404d8f | 1977 | if (!acpi_bus_get_device(handle, &device)) { |
ca589f94 RW |
1978 | struct acpi_scan_handler *dev_handler = device->handler; |
1979 | ||
ca589f94 RW |
1980 | if (dev_handler) { |
1981 | if (dev_handler->detach) | |
1982 | dev_handler->detach(device); | |
1983 | ||
1984 | device->handler = NULL; | |
1985 | } else { | |
1986 | device_release_driver(&device->dev); | |
1987 | } | |
202317a5 RW |
1988 | /* |
1989 | * Most likely, the device is going away, so put it into D3cold | |
1990 | * before that. | |
1991 | */ | |
1992 | acpi_device_set_power(device, ACPI_STATE_D3_COLD); | |
1993 | device->flags.initialized = false; | |
1994 | device->flags.visited = false; | |
05404d8f RW |
1995 | } |
1996 | return AE_OK; | |
3fb02738 | 1997 | } |
1da177e4 | 1998 | |
3757b948 RW |
1999 | /** |
2000 | * acpi_bus_trim - Remove ACPI device node and all of its descendants | |
2001 | * @start: Root of the ACPI device nodes subtree to remove. | |
2002 | * | |
2003 | * Must be called under acpi_scan_lock. | |
2004 | */ | |
bfee26db | 2005 | void acpi_bus_trim(struct acpi_device *start) |
1da177e4 | 2006 | { |
05404d8f RW |
2007 | /* |
2008 | * Execute acpi_bus_device_detach() as a post-order callback to detach | |
2009 | * all ACPI drivers from the device nodes being removed. | |
2010 | */ | |
2011 | acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL, | |
2012 | acpi_bus_device_detach, NULL, NULL); | |
2013 | acpi_bus_device_detach(start->handle, 0, NULL, NULL); | |
1da177e4 | 2014 | } |
ceaba663 KA |
2015 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
2016 | ||
e8b945c9 | 2017 | static int acpi_bus_scan_fixed(void) |
1da177e4 | 2018 | { |
4be44fcd | 2019 | int result = 0; |
c4168bff | 2020 | |
1da177e4 LT |
2021 | /* |
2022 | * Enumerate all fixed-feature devices. | |
2023 | */ | |
2c0d4fe0 RW |
2024 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { |
2025 | struct acpi_device *device = NULL; | |
2026 | ||
5c478f49 | 2027 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2028 | ACPI_BUS_TYPE_POWER_BUTTON, |
2c0d4fe0 RW |
2029 | ACPI_STA_DEFAULT); |
2030 | if (result) | |
2031 | return result; | |
2032 | ||
88346167 | 2033 | device->flags.match_driver = true; |
2c0d4fe0 RW |
2034 | result = device_attach(&device->dev); |
2035 | if (result < 0) | |
2036 | return result; | |
2037 | ||
c10d7a13 | 2038 | device_init_wakeup(&device->dev, true); |
3fb02738 | 2039 | } |
1da177e4 | 2040 | |
2c0d4fe0 RW |
2041 | if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { |
2042 | struct acpi_device *device = NULL; | |
2043 | ||
5c478f49 | 2044 | result = acpi_add_single_object(&device, NULL, |
c4168bff | 2045 | ACPI_BUS_TYPE_SLEEP_BUTTON, |
2c0d4fe0 RW |
2046 | ACPI_STA_DEFAULT); |
2047 | if (result) | |
2048 | return result; | |
2049 | ||
88346167 | 2050 | device->flags.match_driver = true; |
2c0d4fe0 | 2051 | result = device_attach(&device->dev); |
3fb02738 | 2052 | } |
1da177e4 | 2053 | |
2c0d4fe0 | 2054 | return result < 0 ? result : 0; |
1da177e4 LT |
2055 | } |
2056 | ||
e747f274 | 2057 | int __init acpi_scan_init(void) |
1da177e4 LT |
2058 | { |
2059 | int result; | |
1da177e4 | 2060 | |
5b327265 PM |
2061 | result = bus_register(&acpi_bus_type); |
2062 | if (result) { | |
2063 | /* We don't want to quit even if we failed to add suspend/resume */ | |
2064 | printk(KERN_ERR PREFIX "Could not register bus type\n"); | |
2065 | } | |
2066 | ||
92ef2a25 | 2067 | acpi_pci_root_init(); |
4daeaf68 | 2068 | acpi_pci_link_init(); |
ac212b69 | 2069 | acpi_processor_init(); |
141a297b | 2070 | acpi_platform_init(); |
f58b082a | 2071 | acpi_lpss_init(); |
2fa97feb | 2072 | acpi_cmos_rtc_init(); |
737f1a9f | 2073 | acpi_container_init(); |
0a347644 | 2074 | acpi_memory_hotplug_init(); |
94add0f8 | 2075 | acpi_dock_init(); |
97d9a9e9 | 2076 | |
3757b948 | 2077 | mutex_lock(&acpi_scan_lock); |
1da177e4 LT |
2078 | /* |
2079 | * Enumerate devices in the ACPI namespace. | |
2080 | */ | |
0cd6ac52 RW |
2081 | result = acpi_bus_scan(ACPI_ROOT_OBJECT); |
2082 | if (result) | |
3757b948 | 2083 | goto out; |
1da177e4 | 2084 | |
0cd6ac52 | 2085 | result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); |
1da177e4 | 2086 | if (result) |
3757b948 | 2087 | goto out; |
1da177e4 | 2088 | |
b8bd759a RW |
2089 | result = acpi_bus_scan_fixed(); |
2090 | if (result) { | |
202317a5 RW |
2091 | acpi_detach_data(acpi_root->handle, acpi_scan_drop_device); |
2092 | acpi_device_del(acpi_root); | |
2093 | put_device(&acpi_root->dev); | |
3757b948 | 2094 | goto out; |
b8bd759a | 2095 | } |
1da177e4 | 2096 | |
b8bd759a | 2097 | acpi_update_all_gpes(); |
3757b948 | 2098 | |
668192b6 YL |
2099 | acpi_pci_root_hp_init(); |
2100 | ||
3757b948 RW |
2101 | out: |
2102 | mutex_unlock(&acpi_scan_lock); | |
2103 | return result; | |
1da177e4 | 2104 | } |