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