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> | |
9b6d97b6 | 7 | #include <linux/kernel.h> |
1da177e4 LT |
8 | #include <linux/acpi.h> |
9 | ||
10 | #include <acpi/acpi_drivers.h> | |
11 | #include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */ | |
12 | ||
1da177e4 | 13 | #define _COMPONENT ACPI_BUS_COMPONENT |
4be44fcd | 14 | ACPI_MODULE_NAME("scan") |
1da177e4 | 15 | #define STRUCT_TO_INT(s) (*((int*)&s)) |
4be44fcd | 16 | extern struct acpi_device *acpi_root; |
1da177e4 LT |
17 | |
18 | #define ACPI_BUS_CLASS "system_bus" | |
19 | #define ACPI_BUS_HID "ACPI_BUS" | |
20 | #define ACPI_BUS_DRIVER_NAME "ACPI Bus Driver" | |
21 | #define ACPI_BUS_DEVICE_NAME "System Bus" | |
22 | ||
23 | static LIST_HEAD(acpi_device_list); | |
24 | DEFINE_SPINLOCK(acpi_device_lock); | |
25 | LIST_HEAD(acpi_wakeup_device_list); | |
26 | ||
1da177e4 | 27 | |
4be44fcd | 28 | static void acpi_device_release(struct kobject *kobj) |
1da177e4 | 29 | { |
4be44fcd | 30 | struct acpi_device *dev = container_of(kobj, struct acpi_device, kobj); |
6044ec88 | 31 | kfree(dev->pnp.cid_list); |
1da177e4 LT |
32 | kfree(dev); |
33 | } | |
34 | ||
35 | struct acpi_device_attribute { | |
36 | struct attribute attr; | |
4be44fcd LB |
37 | ssize_t(*show) (struct acpi_device *, char *); |
38 | ssize_t(*store) (struct acpi_device *, const char *, size_t); | |
1da177e4 LT |
39 | }; |
40 | ||
41 | typedef void acpi_device_sysfs_files(struct kobject *, | |
4be44fcd | 42 | const struct attribute *); |
1da177e4 LT |
43 | |
44 | static void setup_sys_fs_device_files(struct acpi_device *dev, | |
4be44fcd | 45 | acpi_device_sysfs_files * func); |
1da177e4 LT |
46 | |
47 | #define create_sysfs_device_files(dev) \ | |
48 | setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file) | |
49 | #define remove_sysfs_device_files(dev) \ | |
50 | setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file) | |
51 | ||
1d268b0a | 52 | #define to_acpi_dev(n) container_of(n, struct acpi_device, kobj) |
1da177e4 LT |
53 | #define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr); |
54 | ||
55 | static ssize_t acpi_device_attr_show(struct kobject *kobj, | |
4be44fcd | 56 | struct attribute *attr, char *buf) |
1da177e4 | 57 | { |
1d268b0a | 58 | struct acpi_device *device = to_acpi_dev(kobj); |
1da177e4 | 59 | struct acpi_device_attribute *attribute = to_handle_attr(attr); |
70f2817a | 60 | return attribute->show ? attribute->show(device, buf) : -EIO; |
1da177e4 LT |
61 | } |
62 | static ssize_t acpi_device_attr_store(struct kobject *kobj, | |
4be44fcd LB |
63 | struct attribute *attr, const char *buf, |
64 | size_t len) | |
1da177e4 | 65 | { |
1d268b0a | 66 | struct acpi_device *device = to_acpi_dev(kobj); |
1da177e4 | 67 | struct acpi_device_attribute *attribute = to_handle_attr(attr); |
70f2817a | 68 | return attribute->store ? attribute->store(device, buf, len) : -EIO; |
1da177e4 LT |
69 | } |
70 | ||
71 | static struct sysfs_ops acpi_device_sysfs_ops = { | |
4be44fcd LB |
72 | .show = acpi_device_attr_show, |
73 | .store = acpi_device_attr_store, | |
1da177e4 LT |
74 | }; |
75 | ||
76 | static struct kobj_type ktype_acpi_ns = { | |
4be44fcd LB |
77 | .sysfs_ops = &acpi_device_sysfs_ops, |
78 | .release = acpi_device_release, | |
1da177e4 LT |
79 | }; |
80 | ||
312c004d | 81 | static int namespace_uevent(struct kset *kset, struct kobject *kobj, |
1da177e4 LT |
82 | char **envp, int num_envp, char *buffer, |
83 | int buffer_size) | |
84 | { | |
1d268b0a | 85 | struct acpi_device *dev = to_acpi_dev(kobj); |
1da177e4 LT |
86 | int i = 0; |
87 | int len = 0; | |
88 | ||
89 | if (!dev->driver) | |
90 | return 0; | |
91 | ||
312c004d KS |
92 | if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, |
93 | "PHYSDEVDRIVER=%s", dev->driver->name)) | |
1da177e4 LT |
94 | return -ENOMEM; |
95 | ||
96 | envp[i] = NULL; | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
312c004d KS |
101 | static struct kset_uevent_ops namespace_uevent_ops = { |
102 | .uevent = &namespace_uevent, | |
1da177e4 LT |
103 | }; |
104 | ||
105 | static struct kset acpi_namespace_kset = { | |
4be44fcd LB |
106 | .kobj = { |
107 | .name = "namespace", | |
108 | }, | |
1da177e4 | 109 | .subsys = &acpi_subsys, |
4be44fcd | 110 | .ktype = &ktype_acpi_ns, |
312c004d | 111 | .uevent_ops = &namespace_uevent_ops, |
1da177e4 LT |
112 | }; |
113 | ||
1da177e4 | 114 | /* -------------------------------------------------------------------------- |
312c004d | 115 | ACPI sysfs device file support |
1da177e4 | 116 | -------------------------------------------------------------------------- */ |
4be44fcd LB |
117 | static ssize_t acpi_eject_store(struct acpi_device *device, |
118 | const char *buf, size_t count); | |
1da177e4 LT |
119 | |
120 | #define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \ | |
121 | static struct acpi_device_attribute acpi_device_attr_##_name = \ | |
122 | __ATTR(_name, _mode, _show, _store) | |
123 | ||
124 | ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); | |
125 | ||
126 | /** | |
127 | * setup_sys_fs_device_files - sets up the device files under device namespace | |
67be2dd1 MW |
128 | * @dev: acpi_device object |
129 | * @func: function pointer to create or destroy the device file | |
1da177e4 LT |
130 | */ |
131 | static void | |
4be44fcd LB |
132 | setup_sys_fs_device_files(struct acpi_device *dev, |
133 | acpi_device_sysfs_files * func) | |
1da177e4 | 134 | { |
4be44fcd LB |
135 | acpi_status status; |
136 | acpi_handle temp = NULL; | |
1da177e4 LT |
137 | |
138 | /* | |
139 | * If device has _EJ0, 'eject' file is created that is used to trigger | |
140 | * hot-removal function from userland. | |
141 | */ | |
142 | status = acpi_get_handle(dev->handle, "_EJ0", &temp); | |
143 | if (ACPI_SUCCESS(status)) | |
4be44fcd | 144 | (*(func)) (&dev->kobj, &acpi_device_attr_eject.attr); |
1da177e4 LT |
145 | } |
146 | ||
4be44fcd | 147 | static int acpi_eject_operation(acpi_handle handle, int lockable) |
1da177e4 LT |
148 | { |
149 | struct acpi_object_list arg_list; | |
150 | union acpi_object arg; | |
151 | acpi_status status = AE_OK; | |
152 | ||
153 | /* | |
154 | * TBD: evaluate _PS3? | |
155 | */ | |
156 | ||
157 | if (lockable) { | |
158 | arg_list.count = 1; | |
159 | arg_list.pointer = &arg; | |
160 | arg.type = ACPI_TYPE_INTEGER; | |
161 | arg.integer.value = 0; | |
162 | acpi_evaluate_object(handle, "_LCK", &arg_list, NULL); | |
163 | } | |
164 | ||
165 | arg_list.count = 1; | |
166 | arg_list.pointer = &arg; | |
167 | arg.type = ACPI_TYPE_INTEGER; | |
168 | arg.integer.value = 1; | |
169 | ||
170 | /* | |
171 | * TBD: _EJD support. | |
172 | */ | |
173 | ||
174 | status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL); | |
175 | if (ACPI_FAILURE(status)) { | |
4be44fcd | 176 | return (-ENODEV); |
1da177e4 LT |
177 | } |
178 | ||
4be44fcd | 179 | return (0); |
1da177e4 LT |
180 | } |
181 | ||
1da177e4 LT |
182 | static ssize_t |
183 | acpi_eject_store(struct acpi_device *device, const char *buf, size_t count) | |
184 | { | |
4be44fcd LB |
185 | int result; |
186 | int ret = count; | |
187 | int islockable; | |
188 | acpi_status status; | |
189 | acpi_handle handle; | |
190 | acpi_object_type type = 0; | |
1da177e4 LT |
191 | |
192 | if ((!count) || (buf[0] != '1')) { | |
193 | return -EINVAL; | |
194 | } | |
1da177e4 LT |
195 | #ifndef FORCE_EJECT |
196 | if (device->driver == NULL) { | |
197 | ret = -ENODEV; | |
198 | goto err; | |
199 | } | |
200 | #endif | |
201 | status = acpi_get_type(device->handle, &type); | |
4be44fcd | 202 | if (ACPI_FAILURE(status) || (!device->flags.ejectable)) { |
1da177e4 LT |
203 | ret = -ENODEV; |
204 | goto err; | |
205 | } | |
206 | ||
207 | islockable = device->flags.lockable; | |
208 | handle = device->handle; | |
209 | ||
eefa27a9 | 210 | result = acpi_bus_trim(device, 1); |
1da177e4 LT |
211 | |
212 | if (!result) | |
213 | result = acpi_eject_operation(handle, islockable); | |
214 | ||
215 | if (result) { | |
216 | ret = -EBUSY; | |
217 | } | |
4be44fcd | 218 | err: |
1da177e4 LT |
219 | return ret; |
220 | } | |
221 | ||
1da177e4 | 222 | /* -------------------------------------------------------------------------- |
9e89dde2 | 223 | ACPI Bus operations |
1da177e4 | 224 | -------------------------------------------------------------------------- */ |
9e89dde2 | 225 | static int root_suspend(struct acpi_device * acpi_dev, pm_message_t state) |
1da177e4 | 226 | { |
9e89dde2 ZR |
227 | struct acpi_device * dev, * next; |
228 | int result; | |
229 | ||
230 | spin_lock(&acpi_device_lock); | |
231 | list_for_each_entry_safe_reverse(dev, next, &acpi_device_list, g_list) { | |
232 | if (dev->driver && dev->driver->ops.suspend) { | |
233 | spin_unlock(&acpi_device_lock); | |
234 | result = dev->driver->ops.suspend(dev, 0); | |
235 | if (result) { | |
236 | printk(KERN_ERR PREFIX "[%s - %s] Suspend failed: %d\n", | |
237 | acpi_device_name(dev), | |
238 | acpi_device_bid(dev), result); | |
239 | } | |
240 | spin_lock(&acpi_device_lock); | |
241 | } | |
242 | } | |
243 | spin_unlock(&acpi_device_lock); | |
1da177e4 LT |
244 | return 0; |
245 | } | |
246 | ||
9e89dde2 ZR |
247 | static int acpi_device_suspend(struct device * dev, pm_message_t state) |
248 | { | |
1d268b0a | 249 | struct acpi_device * acpi_dev = to_acpi_device(dev); |
1da177e4 | 250 | |
9e89dde2 ZR |
251 | /* |
252 | * For now, we should only register 1 generic device - | |
253 | * the ACPI root device - and from there, we walk the | |
254 | * tree of ACPI devices to suspend each one using the | |
255 | * ACPI driver methods. | |
256 | */ | |
257 | if (acpi_dev->handle == ACPI_ROOT_OBJECT) | |
258 | root_suspend(acpi_dev, state); | |
259 | return 0; | |
260 | } | |
261 | ||
262 | static int root_resume(struct acpi_device * acpi_dev) | |
263 | { | |
264 | struct acpi_device * dev, * next; | |
265 | int result; | |
266 | ||
267 | spin_lock(&acpi_device_lock); | |
268 | list_for_each_entry_safe(dev, next, &acpi_device_list, g_list) { | |
269 | if (dev->driver && dev->driver->ops.resume) { | |
270 | spin_unlock(&acpi_device_lock); | |
271 | result = dev->driver->ops.resume(dev, 0); | |
272 | if (result) { | |
273 | printk(KERN_ERR PREFIX "[%s - %s] resume failed: %d\n", | |
274 | acpi_device_name(dev), | |
275 | acpi_device_bid(dev), result); | |
276 | } | |
277 | spin_lock(&acpi_device_lock); | |
278 | } | |
279 | } | |
280 | spin_unlock(&acpi_device_lock); | |
281 | return 0; | |
282 | } | |
283 | ||
284 | static int acpi_device_resume(struct device * dev) | |
285 | { | |
1d268b0a | 286 | struct acpi_device * acpi_dev = to_acpi_device(dev); |
9e89dde2 ZR |
287 | |
288 | /* | |
289 | * For now, we should only register 1 generic device - | |
290 | * the ACPI root device - and from there, we walk the | |
291 | * tree of ACPI devices to resume each one using the | |
292 | * ACPI driver methods. | |
293 | */ | |
294 | if (acpi_dev->handle == ACPI_ROOT_OBJECT) | |
295 | root_resume(acpi_dev); | |
296 | return 0; | |
297 | } | |
1da177e4 | 298 | |
1da177e4 | 299 | /** |
d758a8fa RD |
300 | * acpi_bus_match - match device IDs to driver's supported IDs |
301 | * @device: the device that we are trying to match to a driver | |
302 | * @driver: driver whose device id table is being checked | |
303 | * | |
1da177e4 LT |
304 | * Checks the device's hardware (_HID) or compatible (_CID) ids to see if it |
305 | * matches the specified driver's criteria. | |
306 | */ | |
307 | static int | |
4be44fcd | 308 | acpi_bus_match(struct acpi_device *device, struct acpi_driver *driver) |
1da177e4 LT |
309 | { |
310 | if (driver && driver->ops.match) | |
311 | return driver->ops.match(device, driver); | |
312 | return acpi_match_ids(device, driver->ids); | |
313 | } | |
314 | ||
9e89dde2 ZR |
315 | static struct bus_type acpi_bus_type = { |
316 | .name = "acpi", | |
317 | .suspend = acpi_device_suspend, | |
318 | .resume = acpi_device_resume, | |
319 | }; | |
320 | ||
321 | static void acpi_device_register(struct acpi_device *device, | |
322 | struct acpi_device *parent) | |
323 | { | |
324 | int err; | |
325 | ||
326 | /* | |
327 | * Linkage | |
328 | * ------- | |
329 | * Link this device to its parent and siblings. | |
330 | */ | |
331 | INIT_LIST_HEAD(&device->children); | |
332 | INIT_LIST_HEAD(&device->node); | |
333 | INIT_LIST_HEAD(&device->g_list); | |
334 | INIT_LIST_HEAD(&device->wakeup_list); | |
335 | ||
336 | spin_lock(&acpi_device_lock); | |
337 | if (device->parent) { | |
338 | list_add_tail(&device->node, &device->parent->children); | |
339 | list_add_tail(&device->g_list, &device->parent->g_list); | |
340 | } else | |
341 | list_add_tail(&device->g_list, &acpi_device_list); | |
342 | if (device->wakeup.flags.valid) | |
343 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); | |
344 | spin_unlock(&acpi_device_lock); | |
345 | ||
346 | strlcpy(device->kobj.name, device->pnp.bus_id, KOBJ_NAME_LEN); | |
347 | if (parent) | |
348 | device->kobj.parent = &parent->kobj; | |
349 | device->kobj.ktype = &ktype_acpi_ns; | |
350 | device->kobj.kset = &acpi_namespace_kset; | |
351 | err = kobject_register(&device->kobj); | |
352 | if (err < 0) | |
353 | printk(KERN_WARNING "%s: kobject_register error: %d\n", | |
354 | __FUNCTION__, err); | |
355 | create_sysfs_device_files(device); | |
356 | } | |
357 | ||
358 | static void acpi_device_unregister(struct acpi_device *device, int type) | |
359 | { | |
360 | spin_lock(&acpi_device_lock); | |
361 | if (device->parent) { | |
362 | list_del(&device->node); | |
363 | list_del(&device->g_list); | |
364 | } else | |
365 | list_del(&device->g_list); | |
366 | ||
367 | list_del(&device->wakeup_list); | |
368 | ||
369 | spin_unlock(&acpi_device_lock); | |
370 | ||
371 | acpi_detach_data(device->handle, acpi_bus_data_handler); | |
372 | remove_sysfs_device_files(device); | |
373 | kobject_unregister(&device->kobj); | |
374 | } | |
375 | ||
376 | /* -------------------------------------------------------------------------- | |
377 | Driver Management | |
378 | -------------------------------------------------------------------------- */ | |
379 | static LIST_HEAD(acpi_bus_drivers); | |
380 | ||
1da177e4 | 381 | /** |
d758a8fa RD |
382 | * acpi_bus_driver_init - add a device to a driver |
383 | * @device: the device to add and initialize | |
384 | * @driver: driver for the device | |
385 | * | |
1da177e4 LT |
386 | * Used to initialize a device via its device driver. Called whenever a |
387 | * driver is bound to a device. Invokes the driver's add() and start() ops. | |
388 | */ | |
389 | static int | |
4be44fcd | 390 | acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver) |
1da177e4 | 391 | { |
4be44fcd | 392 | int result = 0; |
1da177e4 | 393 | |
1da177e4 LT |
394 | |
395 | if (!device || !driver) | |
d550d98d | 396 | return -EINVAL; |
1da177e4 LT |
397 | |
398 | if (!driver->ops.add) | |
d550d98d | 399 | return -ENOSYS; |
1da177e4 LT |
400 | |
401 | result = driver->ops.add(device); | |
402 | if (result) { | |
403 | device->driver = NULL; | |
404 | acpi_driver_data(device) = NULL; | |
d550d98d | 405 | return result; |
1da177e4 LT |
406 | } |
407 | ||
408 | device->driver = driver; | |
409 | ||
410 | /* | |
411 | * TBD - Configuration Management: Assign resources to device based | |
412 | * upon possible configuration and currently allocated resources. | |
413 | */ | |
414 | ||
4be44fcd LB |
415 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
416 | "Driver successfully bound to device\n")); | |
d550d98d | 417 | return 0; |
3fb02738 RS |
418 | } |
419 | ||
8713cbef | 420 | static int acpi_start_single_object(struct acpi_device *device) |
3fb02738 RS |
421 | { |
422 | int result = 0; | |
423 | struct acpi_driver *driver; | |
424 | ||
3fb02738 RS |
425 | |
426 | if (!(driver = device->driver)) | |
d550d98d | 427 | return 0; |
3fb02738 | 428 | |
1da177e4 LT |
429 | if (driver->ops.start) { |
430 | result = driver->ops.start(device); | |
431 | if (result && driver->ops.remove) | |
432 | driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL); | |
1da177e4 LT |
433 | } |
434 | ||
d550d98d | 435 | return result; |
1da177e4 LT |
436 | } |
437 | ||
9d9f749b | 438 | static void acpi_driver_attach(struct acpi_driver *drv) |
1da177e4 | 439 | { |
4be44fcd | 440 | struct list_head *node, *next; |
1da177e4 | 441 | |
1da177e4 LT |
442 | |
443 | spin_lock(&acpi_device_lock); | |
444 | list_for_each_safe(node, next, &acpi_device_list) { | |
4be44fcd LB |
445 | struct acpi_device *dev = |
446 | container_of(node, struct acpi_device, g_list); | |
1da177e4 LT |
447 | |
448 | if (dev->driver || !dev->status.present) | |
449 | continue; | |
450 | spin_unlock(&acpi_device_lock); | |
451 | ||
452 | if (!acpi_bus_match(dev, drv)) { | |
453 | if (!acpi_bus_driver_init(dev, drv)) { | |
3fb02738 | 454 | acpi_start_single_object(dev); |
1da177e4 | 455 | atomic_inc(&drv->references); |
4be44fcd LB |
456 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
457 | "Found driver [%s] for device [%s]\n", | |
1da177e4 LT |
458 | drv->name, dev->pnp.bus_id)); |
459 | } | |
460 | } | |
461 | spin_lock(&acpi_device_lock); | |
462 | } | |
463 | spin_unlock(&acpi_device_lock); | |
1da177e4 LT |
464 | } |
465 | ||
06ea8e08 | 466 | static void acpi_driver_detach(struct acpi_driver *drv) |
1da177e4 | 467 | { |
4be44fcd | 468 | struct list_head *node, *next; |
1da177e4 | 469 | |
1da177e4 LT |
470 | |
471 | spin_lock(&acpi_device_lock); | |
4be44fcd LB |
472 | list_for_each_safe(node, next, &acpi_device_list) { |
473 | struct acpi_device *dev = | |
474 | container_of(node, struct acpi_device, g_list); | |
1da177e4 LT |
475 | |
476 | if (dev->driver == drv) { | |
477 | spin_unlock(&acpi_device_lock); | |
478 | if (drv->ops.remove) | |
4be44fcd | 479 | drv->ops.remove(dev, ACPI_BUS_REMOVAL_NORMAL); |
1da177e4 LT |
480 | spin_lock(&acpi_device_lock); |
481 | dev->driver = NULL; | |
482 | dev->driver_data = NULL; | |
483 | atomic_dec(&drv->references); | |
484 | } | |
485 | } | |
9e89dde2 ZR |
486 | spin_unlock(&acpi_device_lock); |
487 | } | |
488 | ||
489 | /** | |
490 | * acpi_bus_register_driver - register a driver with the ACPI bus | |
491 | * @driver: driver being registered | |
492 | * | |
493 | * Registers a driver with the ACPI bus. Searches the namespace for all | |
494 | * devices that match the driver's criteria and binds. Returns zero for | |
495 | * success or a negative error status for failure. | |
496 | */ | |
497 | int acpi_bus_register_driver(struct acpi_driver *driver) | |
498 | { | |
499 | ||
500 | if (acpi_disabled) | |
501 | return -ENODEV; | |
502 | ||
503 | spin_lock(&acpi_device_lock); | |
504 | list_add_tail(&driver->node, &acpi_bus_drivers); | |
505 | spin_unlock(&acpi_device_lock); | |
506 | acpi_driver_attach(driver); | |
507 | ||
508 | return 0; | |
509 | } | |
510 | ||
511 | EXPORT_SYMBOL(acpi_bus_register_driver); | |
512 | ||
513 | /** | |
514 | * acpi_bus_unregister_driver - unregisters a driver with the APIC bus | |
515 | * @driver: driver to unregister | |
516 | * | |
517 | * Unregisters a driver with the ACPI bus. Searches the namespace for all | |
518 | * devices that match the driver's criteria and unbinds. | |
519 | */ | |
520 | void acpi_bus_unregister_driver(struct acpi_driver *driver) | |
521 | { | |
522 | acpi_driver_detach(driver); | |
523 | ||
524 | if (!atomic_read(&driver->references)) { | |
525 | spin_lock(&acpi_device_lock); | |
526 | list_del_init(&driver->node); | |
527 | spin_unlock(&acpi_device_lock); | |
528 | } | |
529 | return; | |
530 | } | |
531 | ||
532 | EXPORT_SYMBOL(acpi_bus_unregister_driver); | |
533 | ||
534 | /** | |
535 | * acpi_bus_find_driver - check if there is a driver installed for the device | |
536 | * @device: device that we are trying to find a supporting driver for | |
537 | * | |
538 | * Parses the list of registered drivers looking for a driver applicable for | |
539 | * the specified device. | |
540 | */ | |
541 | static int acpi_bus_find_driver(struct acpi_device *device) | |
542 | { | |
543 | int result = 0; | |
544 | struct list_head *node, *next; | |
545 | ||
546 | ||
547 | spin_lock(&acpi_device_lock); | |
548 | list_for_each_safe(node, next, &acpi_bus_drivers) { | |
549 | struct acpi_driver *driver = | |
550 | container_of(node, struct acpi_driver, node); | |
551 | ||
552 | atomic_inc(&driver->references); | |
553 | spin_unlock(&acpi_device_lock); | |
554 | if (!acpi_bus_match(device, driver)) { | |
555 | result = acpi_bus_driver_init(device, driver); | |
556 | if (!result) | |
557 | goto Done; | |
558 | } | |
559 | atomic_dec(&driver->references); | |
560 | spin_lock(&acpi_device_lock); | |
561 | } | |
562 | spin_unlock(&acpi_device_lock); | |
563 | ||
564 | Done: | |
565 | return result; | |
566 | } | |
567 | ||
568 | /* -------------------------------------------------------------------------- | |
569 | Device Enumeration | |
570 | -------------------------------------------------------------------------- */ | |
571 | acpi_status | |
572 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) | |
573 | { | |
574 | acpi_status status; | |
575 | acpi_handle tmp; | |
576 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
577 | union acpi_object *obj; | |
578 | ||
579 | status = acpi_get_handle(handle, "_EJD", &tmp); | |
580 | if (ACPI_FAILURE(status)) | |
581 | return status; | |
582 | ||
583 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); | |
584 | if (ACPI_SUCCESS(status)) { | |
585 | obj = buffer.pointer; | |
586 | status = acpi_get_handle(NULL, obj->string.pointer, ejd); | |
587 | kfree(buffer.pointer); | |
588 | } | |
589 | return status; | |
590 | } | |
591 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); | |
592 | ||
593 | void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context) | |
594 | { | |
595 | ||
596 | /* TBD */ | |
597 | ||
598 | return; | |
599 | } | |
600 | ||
601 | int acpi_match_ids(struct acpi_device *device, char *ids) | |
602 | { | |
603 | if (device->flags.hardware_id) | |
604 | if (strstr(ids, device->pnp.hardware_id)) | |
605 | return 0; | |
606 | ||
607 | if (device->flags.compatible_ids) { | |
608 | struct acpi_compatible_id_list *cid_list = device->pnp.cid_list; | |
609 | int i; | |
610 | ||
611 | /* compare multiple _CID entries against driver ids */ | |
612 | for (i = 0; i < cid_list->count; i++) { | |
613 | if (strstr(ids, cid_list->id[i].value)) | |
614 | return 0; | |
615 | } | |
616 | } | |
617 | return -ENOENT; | |
618 | } | |
619 | ||
620 | static int acpi_bus_get_perf_flags(struct acpi_device *device) | |
621 | { | |
622 | device->performance.state = ACPI_STATE_UNKNOWN; | |
623 | return 0; | |
624 | } | |
625 | ||
626 | static acpi_status | |
627 | acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device, | |
628 | union acpi_object *package) | |
629 | { | |
630 | int i = 0; | |
631 | union acpi_object *element = NULL; | |
632 | ||
633 | if (!device || !package || (package->package.count < 2)) | |
634 | return AE_BAD_PARAMETER; | |
635 | ||
636 | element = &(package->package.elements[0]); | |
637 | if (!element) | |
638 | return AE_BAD_PARAMETER; | |
639 | if (element->type == ACPI_TYPE_PACKAGE) { | |
640 | if ((element->package.count < 2) || | |
641 | (element->package.elements[0].type != | |
642 | ACPI_TYPE_LOCAL_REFERENCE) | |
643 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) | |
644 | return AE_BAD_DATA; | |
645 | device->wakeup.gpe_device = | |
646 | element->package.elements[0].reference.handle; | |
647 | device->wakeup.gpe_number = | |
648 | (u32) element->package.elements[1].integer.value; | |
649 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
650 | device->wakeup.gpe_number = element->integer.value; | |
651 | } else | |
652 | return AE_BAD_DATA; | |
653 | ||
654 | element = &(package->package.elements[1]); | |
655 | if (element->type != ACPI_TYPE_INTEGER) { | |
656 | return AE_BAD_DATA; | |
657 | } | |
658 | device->wakeup.sleep_state = element->integer.value; | |
659 | ||
660 | if ((package->package.count - 2) > ACPI_MAX_HANDLES) { | |
661 | return AE_NO_MEMORY; | |
662 | } | |
663 | device->wakeup.resources.count = package->package.count - 2; | |
664 | for (i = 0; i < device->wakeup.resources.count; i++) { | |
665 | element = &(package->package.elements[i + 2]); | |
666 | if (element->type != ACPI_TYPE_ANY) { | |
667 | return AE_BAD_DATA; | |
668 | } | |
669 | ||
670 | device->wakeup.resources.handles[i] = element->reference.handle; | |
671 | } | |
672 | ||
673 | return AE_OK; | |
1da177e4 LT |
674 | } |
675 | ||
9e89dde2 | 676 | static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
1da177e4 | 677 | { |
9e89dde2 ZR |
678 | acpi_status status = 0; |
679 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
680 | union acpi_object *package = NULL; | |
1da177e4 | 681 | |
1da177e4 | 682 | |
9e89dde2 ZR |
683 | /* _PRW */ |
684 | status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer); | |
685 | if (ACPI_FAILURE(status)) { | |
686 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); | |
687 | goto end; | |
688 | } | |
1da177e4 | 689 | |
9e89dde2 ZR |
690 | package = (union acpi_object *)buffer.pointer; |
691 | status = acpi_bus_extract_wakeup_device_power_package(device, package); | |
692 | if (ACPI_FAILURE(status)) { | |
693 | ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package")); | |
694 | goto end; | |
695 | } | |
1da177e4 | 696 | |
9e89dde2 | 697 | kfree(buffer.pointer); |
1da177e4 | 698 | |
9e89dde2 ZR |
699 | device->wakeup.flags.valid = 1; |
700 | /* Power button, Lid switch always enable wakeup */ | |
701 | if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E")) | |
702 | device->wakeup.flags.run_wake = 1; | |
1a365616 | 703 | |
9e89dde2 ZR |
704 | end: |
705 | if (ACPI_FAILURE(status)) | |
706 | device->flags.wake_capable = 0; | |
707 | return 0; | |
1da177e4 | 708 | } |
4be44fcd | 709 | |
9e89dde2 | 710 | static int acpi_bus_get_power_flags(struct acpi_device *device) |
1da177e4 | 711 | { |
9e89dde2 ZR |
712 | acpi_status status = 0; |
713 | acpi_handle handle = NULL; | |
714 | u32 i = 0; | |
1da177e4 | 715 | |
1da177e4 | 716 | |
9e89dde2 ZR |
717 | /* |
718 | * Power Management Flags | |
719 | */ | |
720 | status = acpi_get_handle(device->handle, "_PSC", &handle); | |
721 | if (ACPI_SUCCESS(status)) | |
722 | device->power.flags.explicit_get = 1; | |
723 | status = acpi_get_handle(device->handle, "_IRC", &handle); | |
724 | if (ACPI_SUCCESS(status)) | |
725 | device->power.flags.inrush_current = 1; | |
1da177e4 | 726 | |
9e89dde2 ZR |
727 | /* |
728 | * Enumerate supported power management states | |
729 | */ | |
730 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) { | |
731 | struct acpi_device_power_state *ps = &device->power.states[i]; | |
732 | char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' }; | |
733 | ||
734 | /* Evaluate "_PRx" to se if power resources are referenced */ | |
735 | acpi_evaluate_reference(device->handle, object_name, NULL, | |
736 | &ps->resources); | |
737 | if (ps->resources.count) { | |
738 | device->power.flags.power_resources = 1; | |
739 | ps->flags.valid = 1; | |
1da177e4 | 740 | } |
1da177e4 | 741 | |
9e89dde2 ZR |
742 | /* Evaluate "_PSx" to see if we can do explicit sets */ |
743 | object_name[2] = 'S'; | |
744 | status = acpi_get_handle(device->handle, object_name, &handle); | |
745 | if (ACPI_SUCCESS(status)) { | |
746 | ps->flags.explicit_set = 1; | |
747 | ps->flags.valid = 1; | |
748 | } | |
1da177e4 | 749 | |
9e89dde2 ZR |
750 | /* State is valid if we have some power control */ |
751 | if (ps->resources.count || ps->flags.explicit_set) | |
752 | ps->flags.valid = 1; | |
1da177e4 | 753 | |
9e89dde2 ZR |
754 | ps->power = -1; /* Unknown - driver assigned */ |
755 | ps->latency = -1; /* Unknown - driver assigned */ | |
756 | } | |
c8f7a62c | 757 | |
9e89dde2 ZR |
758 | /* Set defaults for D0 and D3 states (always valid) */ |
759 | device->power.states[ACPI_STATE_D0].flags.valid = 1; | |
760 | device->power.states[ACPI_STATE_D0].power = 100; | |
761 | device->power.states[ACPI_STATE_D3].flags.valid = 1; | |
762 | device->power.states[ACPI_STATE_D3].power = 0; | |
c8f7a62c | 763 | |
9e89dde2 ZR |
764 | /* TBD: System wake support and resource requirements. */ |
765 | ||
766 | device->power.state = ACPI_STATE_UNKNOWN; | |
c8f7a62c | 767 | |
9e89dde2 ZR |
768 | return 0; |
769 | } | |
c8f7a62c | 770 | |
4be44fcd | 771 | static int acpi_bus_get_flags(struct acpi_device *device) |
1da177e4 | 772 | { |
4be44fcd LB |
773 | acpi_status status = AE_OK; |
774 | acpi_handle temp = NULL; | |
1da177e4 | 775 | |
1da177e4 LT |
776 | |
777 | /* Presence of _STA indicates 'dynamic_status' */ | |
778 | status = acpi_get_handle(device->handle, "_STA", &temp); | |
779 | if (ACPI_SUCCESS(status)) | |
780 | device->flags.dynamic_status = 1; | |
781 | ||
782 | /* Presence of _CID indicates 'compatible_ids' */ | |
783 | status = acpi_get_handle(device->handle, "_CID", &temp); | |
784 | if (ACPI_SUCCESS(status)) | |
785 | device->flags.compatible_ids = 1; | |
786 | ||
787 | /* Presence of _RMV indicates 'removable' */ | |
788 | status = acpi_get_handle(device->handle, "_RMV", &temp); | |
789 | if (ACPI_SUCCESS(status)) | |
790 | device->flags.removable = 1; | |
791 | ||
792 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ | |
793 | status = acpi_get_handle(device->handle, "_EJD", &temp); | |
794 | if (ACPI_SUCCESS(status)) | |
795 | device->flags.ejectable = 1; | |
796 | else { | |
797 | status = acpi_get_handle(device->handle, "_EJ0", &temp); | |
798 | if (ACPI_SUCCESS(status)) | |
799 | device->flags.ejectable = 1; | |
800 | } | |
801 | ||
802 | /* Presence of _LCK indicates 'lockable' */ | |
803 | status = acpi_get_handle(device->handle, "_LCK", &temp); | |
804 | if (ACPI_SUCCESS(status)) | |
805 | device->flags.lockable = 1; | |
806 | ||
807 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ | |
808 | status = acpi_get_handle(device->handle, "_PS0", &temp); | |
809 | if (ACPI_FAILURE(status)) | |
810 | status = acpi_get_handle(device->handle, "_PR0", &temp); | |
811 | if (ACPI_SUCCESS(status)) | |
812 | device->flags.power_manageable = 1; | |
813 | ||
814 | /* Presence of _PRW indicates wake capable */ | |
815 | status = acpi_get_handle(device->handle, "_PRW", &temp); | |
816 | if (ACPI_SUCCESS(status)) | |
817 | device->flags.wake_capable = 1; | |
818 | ||
819 | /* TBD: Peformance management */ | |
820 | ||
d550d98d | 821 | return 0; |
1da177e4 LT |
822 | } |
823 | ||
4be44fcd LB |
824 | static void acpi_device_get_busid(struct acpi_device *device, |
825 | acpi_handle handle, int type) | |
1da177e4 | 826 | { |
4be44fcd LB |
827 | char bus_id[5] = { '?', 0 }; |
828 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; | |
829 | int i = 0; | |
1da177e4 LT |
830 | |
831 | /* | |
832 | * Bus ID | |
833 | * ------ | |
834 | * The device's Bus ID is simply the object name. | |
835 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? | |
836 | */ | |
837 | switch (type) { | |
838 | case ACPI_BUS_TYPE_SYSTEM: | |
839 | strcpy(device->pnp.bus_id, "ACPI"); | |
840 | break; | |
841 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
842 | strcpy(device->pnp.bus_id, "PWRF"); | |
843 | break; | |
844 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
845 | strcpy(device->pnp.bus_id, "SLPF"); | |
846 | break; | |
847 | default: | |
848 | acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
849 | /* Clean up trailing underscores (if any) */ | |
850 | for (i = 3; i > 1; i--) { | |
851 | if (bus_id[i] == '_') | |
852 | bus_id[i] = '\0'; | |
853 | else | |
854 | break; | |
855 | } | |
856 | strcpy(device->pnp.bus_id, bus_id); | |
857 | break; | |
858 | } | |
859 | } | |
860 | ||
4be44fcd LB |
861 | static void acpi_device_set_id(struct acpi_device *device, |
862 | struct acpi_device *parent, acpi_handle handle, | |
863 | int type) | |
1da177e4 | 864 | { |
4be44fcd LB |
865 | struct acpi_device_info *info; |
866 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
867 | char *hid = NULL; | |
868 | char *uid = NULL; | |
1da177e4 | 869 | struct acpi_compatible_id_list *cid_list = NULL; |
4be44fcd | 870 | acpi_status status; |
1da177e4 LT |
871 | |
872 | switch (type) { | |
873 | case ACPI_BUS_TYPE_DEVICE: | |
874 | status = acpi_get_object_info(handle, &buffer); | |
875 | if (ACPI_FAILURE(status)) { | |
4be44fcd | 876 | printk("%s: Error reading device info\n", __FUNCTION__); |
1da177e4 LT |
877 | return; |
878 | } | |
879 | ||
880 | info = buffer.pointer; | |
881 | if (info->valid & ACPI_VALID_HID) | |
882 | hid = info->hardware_id.value; | |
883 | if (info->valid & ACPI_VALID_UID) | |
884 | uid = info->unique_id.value; | |
885 | if (info->valid & ACPI_VALID_CID) | |
886 | cid_list = &info->compatibility_id; | |
887 | if (info->valid & ACPI_VALID_ADR) { | |
888 | device->pnp.bus_address = info->address; | |
889 | device->flags.bus_address = 1; | |
890 | } | |
891 | break; | |
892 | case ACPI_BUS_TYPE_POWER: | |
893 | hid = ACPI_POWER_HID; | |
894 | break; | |
895 | case ACPI_BUS_TYPE_PROCESSOR: | |
896 | hid = ACPI_PROCESSOR_HID; | |
897 | break; | |
898 | case ACPI_BUS_TYPE_SYSTEM: | |
899 | hid = ACPI_SYSTEM_HID; | |
900 | break; | |
901 | case ACPI_BUS_TYPE_THERMAL: | |
902 | hid = ACPI_THERMAL_HID; | |
903 | break; | |
904 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
905 | hid = ACPI_BUTTON_HID_POWERF; | |
906 | break; | |
907 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
908 | hid = ACPI_BUTTON_HID_SLEEPF; | |
909 | break; | |
910 | } | |
911 | ||
912 | /* | |
913 | * \_SB | |
914 | * ---- | |
915 | * Fix for the system root bus device -- the only root-level device. | |
916 | */ | |
c51a4de8 | 917 | if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) { |
1da177e4 LT |
918 | hid = ACPI_BUS_HID; |
919 | strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME); | |
920 | strcpy(device->pnp.device_class, ACPI_BUS_CLASS); | |
921 | } | |
922 | ||
923 | if (hid) { | |
924 | strcpy(device->pnp.hardware_id, hid); | |
925 | device->flags.hardware_id = 1; | |
926 | } | |
927 | if (uid) { | |
928 | strcpy(device->pnp.unique_id, uid); | |
929 | device->flags.unique_id = 1; | |
930 | } | |
931 | if (cid_list) { | |
932 | device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL); | |
933 | if (device->pnp.cid_list) | |
934 | memcpy(device->pnp.cid_list, cid_list, cid_list->size); | |
935 | else | |
936 | printk(KERN_ERR "Memory allocation error\n"); | |
937 | } | |
938 | ||
02438d87 | 939 | kfree(buffer.pointer); |
1da177e4 LT |
940 | } |
941 | ||
4be44fcd | 942 | static int acpi_device_set_context(struct acpi_device *device, int type) |
1da177e4 LT |
943 | { |
944 | acpi_status status = AE_OK; | |
945 | int result = 0; | |
946 | /* | |
947 | * Context | |
948 | * ------- | |
949 | * Attach this 'struct acpi_device' to the ACPI object. This makes | |
950 | * resolutions from handle->device very efficient. Note that we need | |
951 | * to be careful with fixed-feature devices as they all attach to the | |
952 | * root object. | |
953 | */ | |
4be44fcd | 954 | if (type != ACPI_BUS_TYPE_POWER_BUTTON && |
1da177e4 LT |
955 | type != ACPI_BUS_TYPE_SLEEP_BUTTON) { |
956 | status = acpi_attach_data(device->handle, | |
4be44fcd | 957 | acpi_bus_data_handler, device); |
1da177e4 LT |
958 | |
959 | if (ACPI_FAILURE(status)) { | |
960 | printk("Error attaching device data\n"); | |
961 | result = -ENODEV; | |
962 | } | |
963 | } | |
964 | return result; | |
965 | } | |
966 | ||
4be44fcd LB |
967 | static void acpi_device_get_debug_info(struct acpi_device *device, |
968 | acpi_handle handle, int type) | |
1da177e4 LT |
969 | { |
970 | #ifdef CONFIG_ACPI_DEBUG_OUTPUT | |
4be44fcd LB |
971 | char *type_string = NULL; |
972 | char name[80] = { '?', '\0' }; | |
973 | struct acpi_buffer buffer = { sizeof(name), name }; | |
1da177e4 LT |
974 | |
975 | switch (type) { | |
976 | case ACPI_BUS_TYPE_DEVICE: | |
977 | type_string = "Device"; | |
978 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
979 | break; | |
980 | case ACPI_BUS_TYPE_POWER: | |
981 | type_string = "Power Resource"; | |
982 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
983 | break; | |
984 | case ACPI_BUS_TYPE_PROCESSOR: | |
985 | type_string = "Processor"; | |
986 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
987 | break; | |
988 | case ACPI_BUS_TYPE_SYSTEM: | |
989 | type_string = "System"; | |
990 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
991 | break; | |
992 | case ACPI_BUS_TYPE_THERMAL: | |
993 | type_string = "Thermal Zone"; | |
994 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
995 | break; | |
996 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
997 | type_string = "Power Button"; | |
998 | sprintf(name, "PWRB"); | |
999 | break; | |
1000 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
1001 | type_string = "Sleep Button"; | |
1002 | sprintf(name, "SLPB"); | |
1003 | break; | |
1004 | } | |
1005 | ||
1006 | printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle); | |
4be44fcd | 1007 | #endif /*CONFIG_ACPI_DEBUG_OUTPUT */ |
1da177e4 LT |
1008 | } |
1009 | ||
4be44fcd | 1010 | static int acpi_bus_remove(struct acpi_device *dev, int rmdevice) |
1da177e4 | 1011 | { |
4be44fcd LB |
1012 | int result = 0; |
1013 | struct acpi_driver *driver; | |
1014 | ||
1da177e4 LT |
1015 | |
1016 | if (!dev) | |
d550d98d | 1017 | return -EINVAL; |
1da177e4 LT |
1018 | |
1019 | driver = dev->driver; | |
1020 | ||
1021 | if ((driver) && (driver->ops.remove)) { | |
1022 | ||
1023 | if (driver->ops.stop) { | |
1024 | result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT); | |
1025 | if (result) | |
d550d98d | 1026 | return result; |
1da177e4 LT |
1027 | } |
1028 | ||
1029 | result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT); | |
1030 | if (result) { | |
d550d98d | 1031 | return result; |
1da177e4 LT |
1032 | } |
1033 | ||
1034 | atomic_dec(&dev->driver->references); | |
1035 | dev->driver = NULL; | |
1036 | acpi_driver_data(dev) = NULL; | |
1037 | } | |
1038 | ||
1039 | if (!rmdevice) | |
d550d98d | 1040 | return 0; |
1da177e4 LT |
1041 | |
1042 | if (dev->flags.bus_address) { | |
1043 | if ((dev->parent) && (dev->parent->ops.unbind)) | |
1044 | dev->parent->ops.unbind(dev); | |
1045 | } | |
4be44fcd | 1046 | |
1da177e4 LT |
1047 | acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT); |
1048 | ||
d550d98d | 1049 | return 0; |
1da177e4 LT |
1050 | } |
1051 | ||
3fb02738 | 1052 | static int |
4be44fcd LB |
1053 | acpi_add_single_object(struct acpi_device **child, |
1054 | struct acpi_device *parent, acpi_handle handle, int type) | |
1da177e4 | 1055 | { |
4be44fcd LB |
1056 | int result = 0; |
1057 | struct acpi_device *device = NULL; | |
1da177e4 | 1058 | |
1da177e4 LT |
1059 | |
1060 | if (!child) | |
d550d98d | 1061 | return -EINVAL; |
1da177e4 LT |
1062 | |
1063 | device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL); | |
1064 | if (!device) { | |
6468463a | 1065 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
d550d98d | 1066 | return -ENOMEM; |
1da177e4 LT |
1067 | } |
1068 | memset(device, 0, sizeof(struct acpi_device)); | |
1069 | ||
1070 | device->handle = handle; | |
1071 | device->parent = parent; | |
1072 | ||
4be44fcd | 1073 | acpi_device_get_busid(device, handle, type); |
1da177e4 LT |
1074 | |
1075 | /* | |
1076 | * Flags | |
1077 | * ----- | |
1078 | * Get prior to calling acpi_bus_get_status() so we know whether | |
1079 | * or not _STA is present. Note that we only look for object | |
1080 | * handles -- cannot evaluate objects until we know the device is | |
1081 | * present and properly initialized. | |
1082 | */ | |
1083 | result = acpi_bus_get_flags(device); | |
1084 | if (result) | |
1085 | goto end; | |
1086 | ||
1087 | /* | |
1088 | * Status | |
1089 | * ------ | |
6940faba KT |
1090 | * See if the device is present. We always assume that non-Device |
1091 | * and non-Processor objects (e.g. thermal zones, power resources, | |
1092 | * etc.) are present, functioning, etc. (at least when parent object | |
1093 | * is present). Note that _STA has a different meaning for some | |
1094 | * objects (e.g. power resources) so we need to be careful how we use | |
1095 | * it. | |
1da177e4 LT |
1096 | */ |
1097 | switch (type) { | |
6940faba | 1098 | case ACPI_BUS_TYPE_PROCESSOR: |
1da177e4 LT |
1099 | case ACPI_BUS_TYPE_DEVICE: |
1100 | result = acpi_bus_get_status(device); | |
1101 | if (ACPI_FAILURE(result) || !device->status.present) { | |
1102 | result = -ENOENT; | |
1103 | goto end; | |
1104 | } | |
1105 | break; | |
1106 | default: | |
1107 | STRUCT_TO_INT(device->status) = 0x0F; | |
1108 | break; | |
1109 | } | |
1110 | ||
1111 | /* | |
1112 | * Initialize Device | |
1113 | * ----------------- | |
1114 | * TBD: Synch with Core's enumeration/initialization process. | |
1115 | */ | |
1116 | ||
1117 | /* | |
1118 | * Hardware ID, Unique ID, & Bus Address | |
1119 | * ------------------------------------- | |
1120 | */ | |
4be44fcd | 1121 | acpi_device_set_id(device, parent, handle, type); |
1da177e4 LT |
1122 | |
1123 | /* | |
1124 | * Power Management | |
1125 | * ---------------- | |
1126 | */ | |
1127 | if (device->flags.power_manageable) { | |
1128 | result = acpi_bus_get_power_flags(device); | |
1129 | if (result) | |
1130 | goto end; | |
1131 | } | |
1132 | ||
4be44fcd | 1133 | /* |
1da177e4 LT |
1134 | * Wakeup device management |
1135 | *----------------------- | |
1136 | */ | |
1137 | if (device->flags.wake_capable) { | |
1138 | result = acpi_bus_get_wakeup_device_flags(device); | |
1139 | if (result) | |
1140 | goto end; | |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * Performance Management | |
1145 | * ---------------------- | |
1146 | */ | |
1147 | if (device->flags.performance_manageable) { | |
1148 | result = acpi_bus_get_perf_flags(device); | |
1149 | if (result) | |
1150 | goto end; | |
1151 | } | |
1152 | ||
4be44fcd | 1153 | if ((result = acpi_device_set_context(device, type))) |
1da177e4 LT |
1154 | goto end; |
1155 | ||
4be44fcd | 1156 | acpi_device_get_debug_info(device, handle, type); |
1da177e4 | 1157 | |
4be44fcd | 1158 | acpi_device_register(device, parent); |
1da177e4 LT |
1159 | |
1160 | /* | |
1161 | * Bind _ADR-Based Devices | |
1162 | * ----------------------- | |
1163 | * If there's a a bus address (_ADR) then we utilize the parent's | |
1164 | * 'bind' function (if exists) to bind the ACPI- and natively- | |
1165 | * enumerated device representations. | |
1166 | */ | |
1167 | if (device->flags.bus_address) { | |
1168 | if (device->parent && device->parent->ops.bind) | |
1169 | device->parent->ops.bind(device); | |
1170 | } | |
1171 | ||
1172 | /* | |
1173 | * Locate & Attach Driver | |
1174 | * ---------------------- | |
1175 | * If there's a hardware id (_HID) or compatible ids (_CID) we check | |
1176 | * to see if there's a driver installed for this kind of device. Note | |
1177 | * that drivers can install before or after a device is enumerated. | |
1178 | * | |
1179 | * TBD: Assumes LDM provides driver hot-plug capability. | |
1180 | */ | |
bd7ce5b5 | 1181 | acpi_bus_find_driver(device); |
1da177e4 | 1182 | |
4be44fcd | 1183 | end: |
1da177e4 LT |
1184 | if (!result) |
1185 | *child = device; | |
1186 | else { | |
6044ec88 | 1187 | kfree(device->pnp.cid_list); |
1da177e4 LT |
1188 | kfree(device); |
1189 | } | |
1190 | ||
d550d98d | 1191 | return result; |
1da177e4 | 1192 | } |
1da177e4 | 1193 | |
4be44fcd | 1194 | static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops) |
1da177e4 | 1195 | { |
4be44fcd LB |
1196 | acpi_status status = AE_OK; |
1197 | struct acpi_device *parent = NULL; | |
1198 | struct acpi_device *child = NULL; | |
1199 | acpi_handle phandle = NULL; | |
1200 | acpi_handle chandle = NULL; | |
1201 | acpi_object_type type = 0; | |
1202 | u32 level = 1; | |
1da177e4 | 1203 | |
1da177e4 LT |
1204 | |
1205 | if (!start) | |
d550d98d | 1206 | return -EINVAL; |
1da177e4 LT |
1207 | |
1208 | parent = start; | |
1209 | phandle = start->handle; | |
4be44fcd | 1210 | |
1da177e4 LT |
1211 | /* |
1212 | * Parse through the ACPI namespace, identify all 'devices', and | |
1213 | * create a new 'struct acpi_device' for each. | |
1214 | */ | |
1215 | while ((level > 0) && parent) { | |
1216 | ||
1217 | status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, | |
4be44fcd | 1218 | chandle, &chandle); |
1da177e4 LT |
1219 | |
1220 | /* | |
1221 | * If this scope is exhausted then move our way back up. | |
1222 | */ | |
1223 | if (ACPI_FAILURE(status)) { | |
1224 | level--; | |
1225 | chandle = phandle; | |
1226 | acpi_get_parent(phandle, &phandle); | |
1227 | if (parent->parent) | |
1228 | parent = parent->parent; | |
1229 | continue; | |
1230 | } | |
1231 | ||
1232 | status = acpi_get_type(chandle, &type); | |
1233 | if (ACPI_FAILURE(status)) | |
1234 | continue; | |
1235 | ||
1236 | /* | |
1237 | * If this is a scope object then parse it (depth-first). | |
1238 | */ | |
1239 | if (type == ACPI_TYPE_LOCAL_SCOPE) { | |
1240 | level++; | |
1241 | phandle = chandle; | |
1242 | chandle = NULL; | |
1243 | continue; | |
1244 | } | |
1245 | ||
1246 | /* | |
1247 | * We're only interested in objects that we consider 'devices'. | |
1248 | */ | |
1249 | switch (type) { | |
1250 | case ACPI_TYPE_DEVICE: | |
1251 | type = ACPI_BUS_TYPE_DEVICE; | |
1252 | break; | |
1253 | case ACPI_TYPE_PROCESSOR: | |
1254 | type = ACPI_BUS_TYPE_PROCESSOR; | |
1255 | break; | |
1256 | case ACPI_TYPE_THERMAL: | |
1257 | type = ACPI_BUS_TYPE_THERMAL; | |
1258 | break; | |
1259 | case ACPI_TYPE_POWER: | |
1260 | type = ACPI_BUS_TYPE_POWER; | |
1261 | break; | |
1262 | default: | |
1263 | continue; | |
1264 | } | |
1265 | ||
3fb02738 RS |
1266 | if (ops->acpi_op_add) |
1267 | status = acpi_add_single_object(&child, parent, | |
4be44fcd LB |
1268 | chandle, type); |
1269 | else | |
3fb02738 RS |
1270 | status = acpi_bus_get_device(chandle, &child); |
1271 | ||
4be44fcd LB |
1272 | if (ACPI_FAILURE(status)) |
1273 | continue; | |
3fb02738 RS |
1274 | |
1275 | if (ops->acpi_op_start) { | |
1276 | status = acpi_start_single_object(child); | |
1277 | if (ACPI_FAILURE(status)) | |
1278 | continue; | |
1279 | } | |
1da177e4 LT |
1280 | |
1281 | /* | |
1282 | * If the device is present, enabled, and functioning then | |
1283 | * parse its scope (depth-first). Note that we need to | |
1284 | * represent absent devices to facilitate PnP notifications | |
1285 | * -- but only the subtree head (not all of its children, | |
1286 | * which will be enumerated when the parent is inserted). | |
1287 | * | |
1288 | * TBD: Need notifications and other detection mechanisms | |
4be44fcd | 1289 | * in place before we can fully implement this. |
1da177e4 LT |
1290 | */ |
1291 | if (child->status.present) { | |
1292 | status = acpi_get_next_object(ACPI_TYPE_ANY, chandle, | |
1293 | NULL, NULL); | |
1294 | if (ACPI_SUCCESS(status)) { | |
1295 | level++; | |
1296 | phandle = chandle; | |
1297 | chandle = NULL; | |
1298 | parent = child; | |
1299 | } | |
1300 | } | |
1301 | } | |
1302 | ||
d550d98d | 1303 | return 0; |
1da177e4 | 1304 | } |
1da177e4 | 1305 | |
3fb02738 | 1306 | int |
4be44fcd LB |
1307 | acpi_bus_add(struct acpi_device **child, |
1308 | struct acpi_device *parent, acpi_handle handle, int type) | |
3fb02738 RS |
1309 | { |
1310 | int result; | |
1311 | struct acpi_bus_ops ops; | |
1312 | ||
3fb02738 RS |
1313 | |
1314 | result = acpi_add_single_object(child, parent, handle, type); | |
1315 | if (!result) { | |
1316 | memset(&ops, 0, sizeof(ops)); | |
1317 | ops.acpi_op_add = 1; | |
1318 | result = acpi_bus_scan(*child, &ops); | |
1319 | } | |
d550d98d | 1320 | return result; |
3fb02738 | 1321 | } |
4be44fcd | 1322 | |
3fb02738 RS |
1323 | EXPORT_SYMBOL(acpi_bus_add); |
1324 | ||
4be44fcd | 1325 | int acpi_bus_start(struct acpi_device *device) |
3fb02738 RS |
1326 | { |
1327 | int result; | |
1328 | struct acpi_bus_ops ops; | |
1329 | ||
3fb02738 RS |
1330 | |
1331 | if (!device) | |
d550d98d | 1332 | return -EINVAL; |
3fb02738 RS |
1333 | |
1334 | result = acpi_start_single_object(device); | |
1335 | if (!result) { | |
1336 | memset(&ops, 0, sizeof(ops)); | |
1337 | ops.acpi_op_start = 1; | |
1338 | result = acpi_bus_scan(device, &ops); | |
1339 | } | |
d550d98d | 1340 | return result; |
3fb02738 | 1341 | } |
4be44fcd | 1342 | |
3fb02738 | 1343 | EXPORT_SYMBOL(acpi_bus_start); |
1da177e4 | 1344 | |
ceaba663 | 1345 | int acpi_bus_trim(struct acpi_device *start, int rmdevice) |
1da177e4 | 1346 | { |
4be44fcd LB |
1347 | acpi_status status; |
1348 | struct acpi_device *parent, *child; | |
1349 | acpi_handle phandle, chandle; | |
1350 | acpi_object_type type; | |
1351 | u32 level = 1; | |
1352 | int err = 0; | |
1353 | ||
1354 | parent = start; | |
1da177e4 LT |
1355 | phandle = start->handle; |
1356 | child = chandle = NULL; | |
1357 | ||
1358 | while ((level > 0) && parent && (!err)) { | |
1359 | status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, | |
4be44fcd | 1360 | chandle, &chandle); |
1da177e4 LT |
1361 | |
1362 | /* | |
1363 | * If this scope is exhausted then move our way back up. | |
1364 | */ | |
1365 | if (ACPI_FAILURE(status)) { | |
1366 | level--; | |
1367 | chandle = phandle; | |
1368 | acpi_get_parent(phandle, &phandle); | |
1369 | child = parent; | |
1370 | parent = parent->parent; | |
1371 | ||
1372 | if (level == 0) | |
1373 | err = acpi_bus_remove(child, rmdevice); | |
1374 | else | |
1375 | err = acpi_bus_remove(child, 1); | |
1376 | ||
1377 | continue; | |
1378 | } | |
1379 | ||
1380 | status = acpi_get_type(chandle, &type); | |
1381 | if (ACPI_FAILURE(status)) { | |
1382 | continue; | |
1383 | } | |
1384 | /* | |
1385 | * If there is a device corresponding to chandle then | |
1386 | * parse it (depth-first). | |
1387 | */ | |
1388 | if (acpi_bus_get_device(chandle, &child) == 0) { | |
1389 | level++; | |
1390 | phandle = chandle; | |
1391 | chandle = NULL; | |
1392 | parent = child; | |
1393 | } | |
1394 | continue; | |
1395 | } | |
1396 | return err; | |
1397 | } | |
ceaba663 KA |
1398 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
1399 | ||
1da177e4 | 1400 | |
4be44fcd | 1401 | static int acpi_bus_scan_fixed(struct acpi_device *root) |
1da177e4 | 1402 | { |
4be44fcd LB |
1403 | int result = 0; |
1404 | struct acpi_device *device = NULL; | |
1da177e4 | 1405 | |
1da177e4 LT |
1406 | |
1407 | if (!root) | |
d550d98d | 1408 | return -ENODEV; |
1da177e4 LT |
1409 | |
1410 | /* | |
1411 | * Enumerate all fixed-feature devices. | |
1412 | */ | |
3fb02738 RS |
1413 | if (acpi_fadt.pwr_button == 0) { |
1414 | result = acpi_add_single_object(&device, acpi_root, | |
4be44fcd LB |
1415 | NULL, |
1416 | ACPI_BUS_TYPE_POWER_BUTTON); | |
3fb02738 RS |
1417 | if (!result) |
1418 | result = acpi_start_single_object(device); | |
1419 | } | |
1da177e4 | 1420 | |
3fb02738 RS |
1421 | if (acpi_fadt.sleep_button == 0) { |
1422 | result = acpi_add_single_object(&device, acpi_root, | |
4be44fcd LB |
1423 | NULL, |
1424 | ACPI_BUS_TYPE_SLEEP_BUTTON); | |
3fb02738 RS |
1425 | if (!result) |
1426 | result = acpi_start_single_object(device); | |
1427 | } | |
1da177e4 | 1428 | |
d550d98d | 1429 | return result; |
1da177e4 LT |
1430 | } |
1431 | ||
1da177e4 LT |
1432 | static int __init acpi_scan_init(void) |
1433 | { | |
1434 | int result; | |
3fb02738 | 1435 | struct acpi_bus_ops ops; |
1da177e4 | 1436 | |
1da177e4 LT |
1437 | |
1438 | if (acpi_disabled) | |
d550d98d | 1439 | return 0; |
1da177e4 | 1440 | |
9b6d97b6 RD |
1441 | result = kset_register(&acpi_namespace_kset); |
1442 | if (result < 0) | |
1443 | printk(KERN_ERR PREFIX "kset_register error: %d\n", result); | |
1da177e4 | 1444 | |
5b327265 PM |
1445 | result = bus_register(&acpi_bus_type); |
1446 | if (result) { | |
1447 | /* We don't want to quit even if we failed to add suspend/resume */ | |
1448 | printk(KERN_ERR PREFIX "Could not register bus type\n"); | |
1449 | } | |
1450 | ||
1da177e4 LT |
1451 | /* |
1452 | * Create the root device in the bus's device tree | |
1453 | */ | |
3fb02738 | 1454 | result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT, |
4be44fcd | 1455 | ACPI_BUS_TYPE_SYSTEM); |
1da177e4 LT |
1456 | if (result) |
1457 | goto Done; | |
1458 | ||
3fb02738 | 1459 | result = acpi_start_single_object(acpi_root); |
5b327265 PM |
1460 | if (result) |
1461 | goto Done; | |
1462 | ||
1463 | acpi_root->dev.bus = &acpi_bus_type; | |
1464 | snprintf(acpi_root->dev.bus_id, BUS_ID_SIZE, "%s", acpi_bus_type.name); | |
1465 | result = device_register(&acpi_root->dev); | |
1466 | if (result) { | |
1467 | /* We don't want to quit even if we failed to add suspend/resume */ | |
1468 | printk(KERN_ERR PREFIX "Could not register device\n"); | |
1469 | } | |
3fb02738 | 1470 | |
1da177e4 LT |
1471 | /* |
1472 | * Enumerate devices in the ACPI namespace. | |
1473 | */ | |
1474 | result = acpi_bus_scan_fixed(acpi_root); | |
3fb02738 RS |
1475 | if (!result) { |
1476 | memset(&ops, 0, sizeof(ops)); | |
1477 | ops.acpi_op_add = 1; | |
1478 | ops.acpi_op_start = 1; | |
1479 | result = acpi_bus_scan(acpi_root, &ops); | |
1480 | } | |
1da177e4 LT |
1481 | |
1482 | if (result) | |
1483 | acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL); | |
1484 | ||
4be44fcd | 1485 | Done: |
d550d98d | 1486 | return result; |
1da177e4 LT |
1487 | } |
1488 | ||
1489 | subsys_initcall(acpi_scan_init); |