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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * scan.c - support for transforming the ACPI namespace into individual objects | |
3 | */ | |
4 | ||
5 | #include <linux/module.h> | |
6 | #include <linux/init.h> | |
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 | ||
1da177e4 | 26 | |
4be44fcd | 27 | static void acpi_device_release(struct kobject *kobj) |
1da177e4 | 28 | { |
4be44fcd | 29 | struct acpi_device *dev = container_of(kobj, struct acpi_device, kobj); |
6044ec88 | 30 | kfree(dev->pnp.cid_list); |
1da177e4 LT |
31 | kfree(dev); |
32 | } | |
33 | ||
34 | struct acpi_device_attribute { | |
35 | struct attribute attr; | |
4be44fcd LB |
36 | ssize_t(*show) (struct acpi_device *, char *); |
37 | ssize_t(*store) (struct acpi_device *, const char *, size_t); | |
1da177e4 LT |
38 | }; |
39 | ||
40 | typedef void acpi_device_sysfs_files(struct kobject *, | |
4be44fcd | 41 | const struct attribute *); |
1da177e4 LT |
42 | |
43 | static void setup_sys_fs_device_files(struct acpi_device *dev, | |
4be44fcd | 44 | acpi_device_sysfs_files * func); |
1da177e4 LT |
45 | |
46 | #define create_sysfs_device_files(dev) \ | |
47 | setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file) | |
48 | #define remove_sysfs_device_files(dev) \ | |
49 | setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file) | |
50 | ||
1da177e4 LT |
51 | #define to_acpi_device(n) container_of(n, struct acpi_device, kobj) |
52 | #define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr); | |
53 | ||
54 | static ssize_t acpi_device_attr_show(struct kobject *kobj, | |
4be44fcd | 55 | struct attribute *attr, char *buf) |
1da177e4 LT |
56 | { |
57 | struct acpi_device *device = to_acpi_device(kobj); | |
58 | struct acpi_device_attribute *attribute = to_handle_attr(attr); | |
70f2817a | 59 | return attribute->show ? attribute->show(device, buf) : -EIO; |
1da177e4 LT |
60 | } |
61 | static ssize_t acpi_device_attr_store(struct kobject *kobj, | |
4be44fcd LB |
62 | struct attribute *attr, const char *buf, |
63 | size_t len) | |
1da177e4 LT |
64 | { |
65 | struct acpi_device *device = to_acpi_device(kobj); | |
66 | struct acpi_device_attribute *attribute = to_handle_attr(attr); | |
70f2817a | 67 | return attribute->store ? attribute->store(device, buf, len) : -EIO; |
1da177e4 LT |
68 | } |
69 | ||
70 | static struct sysfs_ops acpi_device_sysfs_ops = { | |
4be44fcd LB |
71 | .show = acpi_device_attr_show, |
72 | .store = acpi_device_attr_store, | |
1da177e4 LT |
73 | }; |
74 | ||
75 | static struct kobj_type ktype_acpi_ns = { | |
4be44fcd LB |
76 | .sysfs_ops = &acpi_device_sysfs_ops, |
77 | .release = acpi_device_release, | |
1da177e4 LT |
78 | }; |
79 | ||
312c004d | 80 | static int namespace_uevent(struct kset *kset, struct kobject *kobj, |
1da177e4 LT |
81 | char **envp, int num_envp, char *buffer, |
82 | int buffer_size) | |
83 | { | |
84 | struct acpi_device *dev = to_acpi_device(kobj); | |
85 | int i = 0; | |
86 | int len = 0; | |
87 | ||
88 | if (!dev->driver) | |
89 | return 0; | |
90 | ||
312c004d KS |
91 | if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, |
92 | "PHYSDEVDRIVER=%s", dev->driver->name)) | |
1da177e4 LT |
93 | return -ENOMEM; |
94 | ||
95 | envp[i] = NULL; | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
312c004d KS |
100 | static struct kset_uevent_ops namespace_uevent_ops = { |
101 | .uevent = &namespace_uevent, | |
1da177e4 LT |
102 | }; |
103 | ||
104 | static struct kset acpi_namespace_kset = { | |
4be44fcd LB |
105 | .kobj = { |
106 | .name = "namespace", | |
107 | }, | |
1da177e4 | 108 | .subsys = &acpi_subsys, |
4be44fcd | 109 | .ktype = &ktype_acpi_ns, |
312c004d | 110 | .uevent_ops = &namespace_uevent_ops, |
1da177e4 LT |
111 | }; |
112 | ||
4be44fcd LB |
113 | static void acpi_device_register(struct acpi_device *device, |
114 | struct acpi_device *parent) | |
1da177e4 LT |
115 | { |
116 | /* | |
117 | * Linkage | |
118 | * ------- | |
119 | * Link this device to its parent and siblings. | |
120 | */ | |
121 | INIT_LIST_HEAD(&device->children); | |
122 | INIT_LIST_HEAD(&device->node); | |
123 | INIT_LIST_HEAD(&device->g_list); | |
124 | INIT_LIST_HEAD(&device->wakeup_list); | |
125 | ||
126 | spin_lock(&acpi_device_lock); | |
127 | if (device->parent) { | |
128 | list_add_tail(&device->node, &device->parent->children); | |
4be44fcd | 129 | list_add_tail(&device->g_list, &device->parent->g_list); |
1da177e4 | 130 | } else |
4be44fcd | 131 | list_add_tail(&device->g_list, &acpi_device_list); |
1da177e4 | 132 | if (device->wakeup.flags.valid) |
4be44fcd | 133 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); |
1da177e4 LT |
134 | spin_unlock(&acpi_device_lock); |
135 | ||
4be44fcd | 136 | strlcpy(device->kobj.name, device->pnp.bus_id, KOBJ_NAME_LEN); |
1da177e4 LT |
137 | if (parent) |
138 | device->kobj.parent = &parent->kobj; | |
139 | device->kobj.ktype = &ktype_acpi_ns; | |
140 | device->kobj.kset = &acpi_namespace_kset; | |
141 | kobject_register(&device->kobj); | |
142 | create_sysfs_device_files(device); | |
143 | } | |
144 | ||
06ea8e08 | 145 | static void acpi_device_unregister(struct acpi_device *device, int type) |
1da177e4 LT |
146 | { |
147 | spin_lock(&acpi_device_lock); | |
148 | if (device->parent) { | |
149 | list_del(&device->node); | |
150 | list_del(&device->g_list); | |
151 | } else | |
152 | list_del(&device->g_list); | |
153 | ||
154 | list_del(&device->wakeup_list); | |
155 | ||
156 | spin_unlock(&acpi_device_lock); | |
157 | ||
158 | acpi_detach_data(device->handle, acpi_bus_data_handler); | |
159 | remove_sysfs_device_files(device); | |
160 | kobject_unregister(&device->kobj); | |
1da177e4 LT |
161 | } |
162 | ||
4be44fcd | 163 | void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context) |
1da177e4 | 164 | { |
1da177e4 LT |
165 | |
166 | /* TBD */ | |
167 | ||
d550d98d | 168 | return; |
1da177e4 LT |
169 | } |
170 | ||
4be44fcd | 171 | static int acpi_bus_get_power_flags(struct acpi_device *device) |
1da177e4 | 172 | { |
4be44fcd LB |
173 | acpi_status status = 0; |
174 | acpi_handle handle = NULL; | |
175 | u32 i = 0; | |
1da177e4 | 176 | |
1da177e4 LT |
177 | |
178 | /* | |
179 | * Power Management Flags | |
180 | */ | |
181 | status = acpi_get_handle(device->handle, "_PSC", &handle); | |
182 | if (ACPI_SUCCESS(status)) | |
183 | device->power.flags.explicit_get = 1; | |
184 | status = acpi_get_handle(device->handle, "_IRC", &handle); | |
185 | if (ACPI_SUCCESS(status)) | |
186 | device->power.flags.inrush_current = 1; | |
187 | ||
188 | /* | |
189 | * Enumerate supported power management states | |
190 | */ | |
191 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) { | |
192 | struct acpi_device_power_state *ps = &device->power.states[i]; | |
4be44fcd | 193 | char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' }; |
1da177e4 LT |
194 | |
195 | /* Evaluate "_PRx" to se if power resources are referenced */ | |
196 | acpi_evaluate_reference(device->handle, object_name, NULL, | |
4be44fcd | 197 | &ps->resources); |
1da177e4 LT |
198 | if (ps->resources.count) { |
199 | device->power.flags.power_resources = 1; | |
200 | ps->flags.valid = 1; | |
201 | } | |
202 | ||
203 | /* Evaluate "_PSx" to see if we can do explicit sets */ | |
204 | object_name[2] = 'S'; | |
205 | status = acpi_get_handle(device->handle, object_name, &handle); | |
206 | if (ACPI_SUCCESS(status)) { | |
207 | ps->flags.explicit_set = 1; | |
208 | ps->flags.valid = 1; | |
209 | } | |
210 | ||
211 | /* State is valid if we have some power control */ | |
212 | if (ps->resources.count || ps->flags.explicit_set) | |
213 | ps->flags.valid = 1; | |
214 | ||
4be44fcd | 215 | ps->power = -1; /* Unknown - driver assigned */ |
1da177e4 LT |
216 | ps->latency = -1; /* Unknown - driver assigned */ |
217 | } | |
218 | ||
219 | /* Set defaults for D0 and D3 states (always valid) */ | |
220 | device->power.states[ACPI_STATE_D0].flags.valid = 1; | |
221 | device->power.states[ACPI_STATE_D0].power = 100; | |
222 | device->power.states[ACPI_STATE_D3].flags.valid = 1; | |
223 | device->power.states[ACPI_STATE_D3].power = 0; | |
224 | ||
225 | /* TBD: System wake support and resource requirements. */ | |
226 | ||
227 | device->power.state = ACPI_STATE_UNKNOWN; | |
228 | ||
d550d98d | 229 | return 0; |
1da177e4 LT |
230 | } |
231 | ||
4be44fcd | 232 | int acpi_match_ids(struct acpi_device *device, char *ids) |
1da177e4 | 233 | { |
1da177e4 LT |
234 | if (device->flags.hardware_id) |
235 | if (strstr(ids, device->pnp.hardware_id)) | |
1a365616 | 236 | return 0; |
1da177e4 LT |
237 | |
238 | if (device->flags.compatible_ids) { | |
239 | struct acpi_compatible_id_list *cid_list = device->pnp.cid_list; | |
240 | int i; | |
241 | ||
242 | /* compare multiple _CID entries against driver ids */ | |
4be44fcd | 243 | for (i = 0; i < cid_list->count; i++) { |
1da177e4 | 244 | if (strstr(ids, cid_list->id[i].value)) |
1a365616 | 245 | return 0; |
1da177e4 LT |
246 | } |
247 | } | |
1a365616 | 248 | return -ENOENT; |
1da177e4 LT |
249 | } |
250 | ||
251 | static acpi_status | |
4be44fcd LB |
252 | acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device, |
253 | union acpi_object *package) | |
1da177e4 | 254 | { |
4be44fcd LB |
255 | int i = 0; |
256 | union acpi_object *element = NULL; | |
1da177e4 LT |
257 | |
258 | if (!device || !package || (package->package.count < 2)) | |
259 | return AE_BAD_PARAMETER; | |
260 | ||
261 | element = &(package->package.elements[0]); | |
262 | if (!element) | |
263 | return AE_BAD_PARAMETER; | |
264 | if (element->type == ACPI_TYPE_PACKAGE) { | |
265 | if ((element->package.count < 2) || | |
4be44fcd LB |
266 | (element->package.elements[0].type != |
267 | ACPI_TYPE_LOCAL_REFERENCE) | |
268 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) | |
1da177e4 | 269 | return AE_BAD_DATA; |
4be44fcd LB |
270 | device->wakeup.gpe_device = |
271 | element->package.elements[0].reference.handle; | |
272 | device->wakeup.gpe_number = | |
273 | (u32) element->package.elements[1].integer.value; | |
274 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
1da177e4 | 275 | device->wakeup.gpe_number = element->integer.value; |
4be44fcd | 276 | } else |
1da177e4 LT |
277 | return AE_BAD_DATA; |
278 | ||
279 | element = &(package->package.elements[1]); | |
280 | if (element->type != ACPI_TYPE_INTEGER) { | |
281 | return AE_BAD_DATA; | |
282 | } | |
283 | device->wakeup.sleep_state = element->integer.value; | |
284 | ||
285 | if ((package->package.count - 2) > ACPI_MAX_HANDLES) { | |
286 | return AE_NO_MEMORY; | |
287 | } | |
288 | device->wakeup.resources.count = package->package.count - 2; | |
4be44fcd | 289 | for (i = 0; i < device->wakeup.resources.count; i++) { |
1da177e4 | 290 | element = &(package->package.elements[i + 2]); |
4be44fcd | 291 | if (element->type != ACPI_TYPE_ANY) { |
1da177e4 LT |
292 | return AE_BAD_DATA; |
293 | } | |
294 | ||
295 | device->wakeup.resources.handles[i] = element->reference.handle; | |
296 | } | |
297 | ||
298 | return AE_OK; | |
299 | } | |
300 | ||
4be44fcd | 301 | static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
1da177e4 | 302 | { |
4be44fcd LB |
303 | acpi_status status = 0; |
304 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
305 | union acpi_object *package = NULL; | |
1da177e4 | 306 | |
1da177e4 LT |
307 | |
308 | /* _PRW */ | |
309 | status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer); | |
310 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 311 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); |
1da177e4 LT |
312 | goto end; |
313 | } | |
314 | ||
4be44fcd | 315 | package = (union acpi_object *)buffer.pointer; |
1da177e4 LT |
316 | status = acpi_bus_extract_wakeup_device_power_package(device, package); |
317 | if (ACPI_FAILURE(status)) { | |
a6fc6720 | 318 | ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package")); |
1da177e4 LT |
319 | goto end; |
320 | } | |
321 | ||
322 | acpi_os_free(buffer.pointer); | |
323 | ||
324 | device->wakeup.flags.valid = 1; | |
4be44fcd | 325 | /* Power button, Lid switch always enable wakeup */ |
1da177e4 LT |
326 | if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E")) |
327 | device->wakeup.flags.run_wake = 1; | |
328 | ||
4be44fcd | 329 | end: |
1da177e4 LT |
330 | if (ACPI_FAILURE(status)) |
331 | device->flags.wake_capable = 0; | |
d550d98d | 332 | return 0; |
1da177e4 LT |
333 | } |
334 | ||
335 | /* -------------------------------------------------------------------------- | |
312c004d | 336 | ACPI sysfs device file support |
1da177e4 | 337 | -------------------------------------------------------------------------- */ |
4be44fcd LB |
338 | static ssize_t acpi_eject_store(struct acpi_device *device, |
339 | const char *buf, size_t count); | |
1da177e4 LT |
340 | |
341 | #define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \ | |
342 | static struct acpi_device_attribute acpi_device_attr_##_name = \ | |
343 | __ATTR(_name, _mode, _show, _store) | |
344 | ||
345 | ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); | |
346 | ||
347 | /** | |
348 | * setup_sys_fs_device_files - sets up the device files under device namespace | |
67be2dd1 MW |
349 | * @dev: acpi_device object |
350 | * @func: function pointer to create or destroy the device file | |
1da177e4 LT |
351 | */ |
352 | static void | |
4be44fcd LB |
353 | setup_sys_fs_device_files(struct acpi_device *dev, |
354 | acpi_device_sysfs_files * func) | |
1da177e4 | 355 | { |
4be44fcd LB |
356 | acpi_status status; |
357 | acpi_handle temp = NULL; | |
1da177e4 LT |
358 | |
359 | /* | |
360 | * If device has _EJ0, 'eject' file is created that is used to trigger | |
361 | * hot-removal function from userland. | |
362 | */ | |
363 | status = acpi_get_handle(dev->handle, "_EJ0", &temp); | |
364 | if (ACPI_SUCCESS(status)) | |
4be44fcd | 365 | (*(func)) (&dev->kobj, &acpi_device_attr_eject.attr); |
1da177e4 LT |
366 | } |
367 | ||
4be44fcd | 368 | static int acpi_eject_operation(acpi_handle handle, int lockable) |
1da177e4 LT |
369 | { |
370 | struct acpi_object_list arg_list; | |
371 | union acpi_object arg; | |
372 | acpi_status status = AE_OK; | |
373 | ||
374 | /* | |
375 | * TBD: evaluate _PS3? | |
376 | */ | |
377 | ||
378 | if (lockable) { | |
379 | arg_list.count = 1; | |
380 | arg_list.pointer = &arg; | |
381 | arg.type = ACPI_TYPE_INTEGER; | |
382 | arg.integer.value = 0; | |
383 | acpi_evaluate_object(handle, "_LCK", &arg_list, NULL); | |
384 | } | |
385 | ||
386 | arg_list.count = 1; | |
387 | arg_list.pointer = &arg; | |
388 | arg.type = ACPI_TYPE_INTEGER; | |
389 | arg.integer.value = 1; | |
390 | ||
391 | /* | |
392 | * TBD: _EJD support. | |
393 | */ | |
394 | ||
395 | status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL); | |
396 | if (ACPI_FAILURE(status)) { | |
4be44fcd | 397 | return (-ENODEV); |
1da177e4 LT |
398 | } |
399 | ||
4be44fcd | 400 | return (0); |
1da177e4 LT |
401 | } |
402 | ||
1da177e4 LT |
403 | static ssize_t |
404 | acpi_eject_store(struct acpi_device *device, const char *buf, size_t count) | |
405 | { | |
4be44fcd LB |
406 | int result; |
407 | int ret = count; | |
408 | int islockable; | |
409 | acpi_status status; | |
410 | acpi_handle handle; | |
411 | acpi_object_type type = 0; | |
1da177e4 LT |
412 | |
413 | if ((!count) || (buf[0] != '1')) { | |
414 | return -EINVAL; | |
415 | } | |
1da177e4 LT |
416 | #ifndef FORCE_EJECT |
417 | if (device->driver == NULL) { | |
418 | ret = -ENODEV; | |
419 | goto err; | |
420 | } | |
421 | #endif | |
422 | status = acpi_get_type(device->handle, &type); | |
4be44fcd | 423 | if (ACPI_FAILURE(status) || (!device->flags.ejectable)) { |
1da177e4 LT |
424 | ret = -ENODEV; |
425 | goto err; | |
426 | } | |
427 | ||
428 | islockable = device->flags.lockable; | |
429 | handle = device->handle; | |
430 | ||
eefa27a9 | 431 | result = acpi_bus_trim(device, 1); |
1da177e4 LT |
432 | |
433 | if (!result) | |
434 | result = acpi_eject_operation(handle, islockable); | |
435 | ||
436 | if (result) { | |
437 | ret = -EBUSY; | |
438 | } | |
4be44fcd | 439 | err: |
1da177e4 LT |
440 | return ret; |
441 | } | |
442 | ||
1da177e4 LT |
443 | /* -------------------------------------------------------------------------- |
444 | Performance Management | |
445 | -------------------------------------------------------------------------- */ | |
446 | ||
4be44fcd | 447 | static int acpi_bus_get_perf_flags(struct acpi_device *device) |
1da177e4 LT |
448 | { |
449 | device->performance.state = ACPI_STATE_UNKNOWN; | |
450 | return 0; | |
451 | } | |
452 | ||
453 | /* -------------------------------------------------------------------------- | |
454 | Driver Management | |
455 | -------------------------------------------------------------------------- */ | |
456 | ||
457 | static LIST_HEAD(acpi_bus_drivers); | |
1da177e4 | 458 | |
1da177e4 | 459 | /** |
d758a8fa RD |
460 | * acpi_bus_match - match device IDs to driver's supported IDs |
461 | * @device: the device that we are trying to match to a driver | |
462 | * @driver: driver whose device id table is being checked | |
463 | * | |
1da177e4 LT |
464 | * Checks the device's hardware (_HID) or compatible (_CID) ids to see if it |
465 | * matches the specified driver's criteria. | |
466 | */ | |
467 | static int | |
4be44fcd | 468 | acpi_bus_match(struct acpi_device *device, struct acpi_driver *driver) |
1da177e4 LT |
469 | { |
470 | if (driver && driver->ops.match) | |
471 | return driver->ops.match(device, driver); | |
472 | return acpi_match_ids(device, driver->ids); | |
473 | } | |
474 | ||
1da177e4 | 475 | /** |
d758a8fa RD |
476 | * acpi_bus_driver_init - add a device to a driver |
477 | * @device: the device to add and initialize | |
478 | * @driver: driver for the device | |
479 | * | |
1da177e4 LT |
480 | * Used to initialize a device via its device driver. Called whenever a |
481 | * driver is bound to a device. Invokes the driver's add() and start() ops. | |
482 | */ | |
483 | static int | |
4be44fcd | 484 | acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver) |
1da177e4 | 485 | { |
4be44fcd | 486 | int result = 0; |
1da177e4 | 487 | |
1da177e4 LT |
488 | |
489 | if (!device || !driver) | |
d550d98d | 490 | return -EINVAL; |
1da177e4 LT |
491 | |
492 | if (!driver->ops.add) | |
d550d98d | 493 | return -ENOSYS; |
1da177e4 LT |
494 | |
495 | result = driver->ops.add(device); | |
496 | if (result) { | |
497 | device->driver = NULL; | |
498 | acpi_driver_data(device) = NULL; | |
d550d98d | 499 | return result; |
1da177e4 LT |
500 | } |
501 | ||
502 | device->driver = driver; | |
503 | ||
504 | /* | |
505 | * TBD - Configuration Management: Assign resources to device based | |
506 | * upon possible configuration and currently allocated resources. | |
507 | */ | |
508 | ||
4be44fcd LB |
509 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
510 | "Driver successfully bound to device\n")); | |
d550d98d | 511 | return 0; |
3fb02738 RS |
512 | } |
513 | ||
8713cbef | 514 | static int acpi_start_single_object(struct acpi_device *device) |
3fb02738 RS |
515 | { |
516 | int result = 0; | |
517 | struct acpi_driver *driver; | |
518 | ||
3fb02738 RS |
519 | |
520 | if (!(driver = device->driver)) | |
d550d98d | 521 | return 0; |
3fb02738 | 522 | |
1da177e4 LT |
523 | if (driver->ops.start) { |
524 | result = driver->ops.start(device); | |
525 | if (result && driver->ops.remove) | |
526 | driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL); | |
1da177e4 LT |
527 | } |
528 | ||
d550d98d | 529 | return result; |
1da177e4 LT |
530 | } |
531 | ||
9d9f749b | 532 | static void acpi_driver_attach(struct acpi_driver *drv) |
1da177e4 | 533 | { |
4be44fcd | 534 | struct list_head *node, *next; |
1da177e4 | 535 | |
1da177e4 LT |
536 | |
537 | spin_lock(&acpi_device_lock); | |
538 | list_for_each_safe(node, next, &acpi_device_list) { | |
4be44fcd LB |
539 | struct acpi_device *dev = |
540 | container_of(node, struct acpi_device, g_list); | |
1da177e4 LT |
541 | |
542 | if (dev->driver || !dev->status.present) | |
543 | continue; | |
544 | spin_unlock(&acpi_device_lock); | |
545 | ||
546 | if (!acpi_bus_match(dev, drv)) { | |
547 | if (!acpi_bus_driver_init(dev, drv)) { | |
3fb02738 | 548 | acpi_start_single_object(dev); |
1da177e4 | 549 | atomic_inc(&drv->references); |
4be44fcd LB |
550 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
551 | "Found driver [%s] for device [%s]\n", | |
1da177e4 LT |
552 | drv->name, dev->pnp.bus_id)); |
553 | } | |
554 | } | |
555 | spin_lock(&acpi_device_lock); | |
556 | } | |
557 | spin_unlock(&acpi_device_lock); | |
1da177e4 LT |
558 | } |
559 | ||
06ea8e08 | 560 | static void acpi_driver_detach(struct acpi_driver *drv) |
1da177e4 | 561 | { |
4be44fcd | 562 | struct list_head *node, *next; |
1da177e4 | 563 | |
1da177e4 LT |
564 | |
565 | spin_lock(&acpi_device_lock); | |
4be44fcd LB |
566 | list_for_each_safe(node, next, &acpi_device_list) { |
567 | struct acpi_device *dev = | |
568 | container_of(node, struct acpi_device, g_list); | |
1da177e4 LT |
569 | |
570 | if (dev->driver == drv) { | |
571 | spin_unlock(&acpi_device_lock); | |
572 | if (drv->ops.remove) | |
4be44fcd | 573 | drv->ops.remove(dev, ACPI_BUS_REMOVAL_NORMAL); |
1da177e4 LT |
574 | spin_lock(&acpi_device_lock); |
575 | dev->driver = NULL; | |
576 | dev->driver_data = NULL; | |
577 | atomic_dec(&drv->references); | |
578 | } | |
579 | } | |
580 | spin_unlock(&acpi_device_lock); | |
1da177e4 LT |
581 | } |
582 | ||
583 | /** | |
d758a8fa RD |
584 | * acpi_bus_register_driver - register a driver with the ACPI bus |
585 | * @driver: driver being registered | |
586 | * | |
1da177e4 | 587 | * Registers a driver with the ACPI bus. Searches the namespace for all |
9d9f749b BH |
588 | * devices that match the driver's criteria and binds. Returns zero for |
589 | * success or a negative error status for failure. | |
1da177e4 | 590 | */ |
4be44fcd | 591 | int acpi_bus_register_driver(struct acpi_driver *driver) |
1da177e4 | 592 | { |
1da177e4 LT |
593 | |
594 | if (acpi_disabled) | |
d550d98d | 595 | return -ENODEV; |
1da177e4 | 596 | |
1da177e4 LT |
597 | spin_lock(&acpi_device_lock); |
598 | list_add_tail(&driver->node, &acpi_bus_drivers); | |
599 | spin_unlock(&acpi_device_lock); | |
9d9f749b | 600 | acpi_driver_attach(driver); |
1da177e4 | 601 | |
d550d98d | 602 | return 0; |
1da177e4 | 603 | } |
1da177e4 | 604 | |
4be44fcd | 605 | EXPORT_SYMBOL(acpi_bus_register_driver); |
1da177e4 LT |
606 | |
607 | /** | |
d758a8fa RD |
608 | * acpi_bus_unregister_driver - unregisters a driver with the APIC bus |
609 | * @driver: driver to unregister | |
610 | * | |
1da177e4 LT |
611 | * Unregisters a driver with the ACPI bus. Searches the namespace for all |
612 | * devices that match the driver's criteria and unbinds. | |
613 | */ | |
06ea8e08 | 614 | void acpi_bus_unregister_driver(struct acpi_driver *driver) |
1da177e4 | 615 | { |
1a365616 BH |
616 | acpi_driver_detach(driver); |
617 | ||
618 | if (!atomic_read(&driver->references)) { | |
619 | spin_lock(&acpi_device_lock); | |
620 | list_del_init(&driver->node); | |
621 | spin_unlock(&acpi_device_lock); | |
622 | } | |
06ea8e08 | 623 | return; |
1da177e4 | 624 | } |
4be44fcd | 625 | |
1da177e4 LT |
626 | EXPORT_SYMBOL(acpi_bus_unregister_driver); |
627 | ||
628 | /** | |
d758a8fa RD |
629 | * acpi_bus_find_driver - check if there is a driver installed for the device |
630 | * @device: device that we are trying to find a supporting driver for | |
631 | * | |
1da177e4 LT |
632 | * Parses the list of registered drivers looking for a driver applicable for |
633 | * the specified device. | |
634 | */ | |
4be44fcd | 635 | static int acpi_bus_find_driver(struct acpi_device *device) |
1da177e4 | 636 | { |
4be44fcd LB |
637 | int result = 0; |
638 | struct list_head *node, *next; | |
1da177e4 | 639 | |
1da177e4 LT |
640 | |
641 | spin_lock(&acpi_device_lock); | |
4be44fcd LB |
642 | list_for_each_safe(node, next, &acpi_bus_drivers) { |
643 | struct acpi_driver *driver = | |
644 | container_of(node, struct acpi_driver, node); | |
1da177e4 LT |
645 | |
646 | atomic_inc(&driver->references); | |
647 | spin_unlock(&acpi_device_lock); | |
648 | if (!acpi_bus_match(device, driver)) { | |
649 | result = acpi_bus_driver_init(device, driver); | |
650 | if (!result) | |
651 | goto Done; | |
652 | } | |
653 | atomic_dec(&driver->references); | |
654 | spin_lock(&acpi_device_lock); | |
655 | } | |
656 | spin_unlock(&acpi_device_lock); | |
657 | ||
4be44fcd | 658 | Done: |
d550d98d | 659 | return result; |
1da177e4 LT |
660 | } |
661 | ||
1da177e4 LT |
662 | /* -------------------------------------------------------------------------- |
663 | Device Enumeration | |
664 | -------------------------------------------------------------------------- */ | |
665 | ||
4be44fcd | 666 | static int acpi_bus_get_flags(struct acpi_device *device) |
1da177e4 | 667 | { |
4be44fcd LB |
668 | acpi_status status = AE_OK; |
669 | acpi_handle temp = NULL; | |
1da177e4 | 670 | |
1da177e4 LT |
671 | |
672 | /* Presence of _STA indicates 'dynamic_status' */ | |
673 | status = acpi_get_handle(device->handle, "_STA", &temp); | |
674 | if (ACPI_SUCCESS(status)) | |
675 | device->flags.dynamic_status = 1; | |
676 | ||
677 | /* Presence of _CID indicates 'compatible_ids' */ | |
678 | status = acpi_get_handle(device->handle, "_CID", &temp); | |
679 | if (ACPI_SUCCESS(status)) | |
680 | device->flags.compatible_ids = 1; | |
681 | ||
682 | /* Presence of _RMV indicates 'removable' */ | |
683 | status = acpi_get_handle(device->handle, "_RMV", &temp); | |
684 | if (ACPI_SUCCESS(status)) | |
685 | device->flags.removable = 1; | |
686 | ||
687 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ | |
688 | status = acpi_get_handle(device->handle, "_EJD", &temp); | |
689 | if (ACPI_SUCCESS(status)) | |
690 | device->flags.ejectable = 1; | |
691 | else { | |
692 | status = acpi_get_handle(device->handle, "_EJ0", &temp); | |
693 | if (ACPI_SUCCESS(status)) | |
694 | device->flags.ejectable = 1; | |
695 | } | |
696 | ||
697 | /* Presence of _LCK indicates 'lockable' */ | |
698 | status = acpi_get_handle(device->handle, "_LCK", &temp); | |
699 | if (ACPI_SUCCESS(status)) | |
700 | device->flags.lockable = 1; | |
701 | ||
702 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ | |
703 | status = acpi_get_handle(device->handle, "_PS0", &temp); | |
704 | if (ACPI_FAILURE(status)) | |
705 | status = acpi_get_handle(device->handle, "_PR0", &temp); | |
706 | if (ACPI_SUCCESS(status)) | |
707 | device->flags.power_manageable = 1; | |
708 | ||
709 | /* Presence of _PRW indicates wake capable */ | |
710 | status = acpi_get_handle(device->handle, "_PRW", &temp); | |
711 | if (ACPI_SUCCESS(status)) | |
712 | device->flags.wake_capable = 1; | |
713 | ||
714 | /* TBD: Peformance management */ | |
715 | ||
d550d98d | 716 | return 0; |
1da177e4 LT |
717 | } |
718 | ||
4be44fcd LB |
719 | static void acpi_device_get_busid(struct acpi_device *device, |
720 | acpi_handle handle, int type) | |
1da177e4 | 721 | { |
4be44fcd LB |
722 | char bus_id[5] = { '?', 0 }; |
723 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; | |
724 | int i = 0; | |
1da177e4 LT |
725 | |
726 | /* | |
727 | * Bus ID | |
728 | * ------ | |
729 | * The device's Bus ID is simply the object name. | |
730 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? | |
731 | */ | |
732 | switch (type) { | |
733 | case ACPI_BUS_TYPE_SYSTEM: | |
734 | strcpy(device->pnp.bus_id, "ACPI"); | |
735 | break; | |
736 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
737 | strcpy(device->pnp.bus_id, "PWRF"); | |
738 | break; | |
739 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
740 | strcpy(device->pnp.bus_id, "SLPF"); | |
741 | break; | |
742 | default: | |
743 | acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
744 | /* Clean up trailing underscores (if any) */ | |
745 | for (i = 3; i > 1; i--) { | |
746 | if (bus_id[i] == '_') | |
747 | bus_id[i] = '\0'; | |
748 | else | |
749 | break; | |
750 | } | |
751 | strcpy(device->pnp.bus_id, bus_id); | |
752 | break; | |
753 | } | |
754 | } | |
755 | ||
4be44fcd LB |
756 | static void acpi_device_set_id(struct acpi_device *device, |
757 | struct acpi_device *parent, acpi_handle handle, | |
758 | int type) | |
1da177e4 | 759 | { |
4be44fcd LB |
760 | struct acpi_device_info *info; |
761 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
762 | char *hid = NULL; | |
763 | char *uid = NULL; | |
1da177e4 | 764 | struct acpi_compatible_id_list *cid_list = NULL; |
4be44fcd | 765 | acpi_status status; |
1da177e4 LT |
766 | |
767 | switch (type) { | |
768 | case ACPI_BUS_TYPE_DEVICE: | |
769 | status = acpi_get_object_info(handle, &buffer); | |
770 | if (ACPI_FAILURE(status)) { | |
4be44fcd | 771 | printk("%s: Error reading device info\n", __FUNCTION__); |
1da177e4 LT |
772 | return; |
773 | } | |
774 | ||
775 | info = buffer.pointer; | |
776 | if (info->valid & ACPI_VALID_HID) | |
777 | hid = info->hardware_id.value; | |
778 | if (info->valid & ACPI_VALID_UID) | |
779 | uid = info->unique_id.value; | |
780 | if (info->valid & ACPI_VALID_CID) | |
781 | cid_list = &info->compatibility_id; | |
782 | if (info->valid & ACPI_VALID_ADR) { | |
783 | device->pnp.bus_address = info->address; | |
784 | device->flags.bus_address = 1; | |
785 | } | |
786 | break; | |
787 | case ACPI_BUS_TYPE_POWER: | |
788 | hid = ACPI_POWER_HID; | |
789 | break; | |
790 | case ACPI_BUS_TYPE_PROCESSOR: | |
791 | hid = ACPI_PROCESSOR_HID; | |
792 | break; | |
793 | case ACPI_BUS_TYPE_SYSTEM: | |
794 | hid = ACPI_SYSTEM_HID; | |
795 | break; | |
796 | case ACPI_BUS_TYPE_THERMAL: | |
797 | hid = ACPI_THERMAL_HID; | |
798 | break; | |
799 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
800 | hid = ACPI_BUTTON_HID_POWERF; | |
801 | break; | |
802 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
803 | hid = ACPI_BUTTON_HID_SLEEPF; | |
804 | break; | |
805 | } | |
806 | ||
807 | /* | |
808 | * \_SB | |
809 | * ---- | |
810 | * Fix for the system root bus device -- the only root-level device. | |
811 | */ | |
c51a4de8 | 812 | if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) { |
1da177e4 LT |
813 | hid = ACPI_BUS_HID; |
814 | strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME); | |
815 | strcpy(device->pnp.device_class, ACPI_BUS_CLASS); | |
816 | } | |
817 | ||
818 | if (hid) { | |
819 | strcpy(device->pnp.hardware_id, hid); | |
820 | device->flags.hardware_id = 1; | |
821 | } | |
822 | if (uid) { | |
823 | strcpy(device->pnp.unique_id, uid); | |
824 | device->flags.unique_id = 1; | |
825 | } | |
826 | if (cid_list) { | |
827 | device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL); | |
828 | if (device->pnp.cid_list) | |
829 | memcpy(device->pnp.cid_list, cid_list, cid_list->size); | |
830 | else | |
831 | printk(KERN_ERR "Memory allocation error\n"); | |
832 | } | |
833 | ||
834 | acpi_os_free(buffer.pointer); | |
835 | } | |
836 | ||
4be44fcd | 837 | static int acpi_device_set_context(struct acpi_device *device, int type) |
1da177e4 LT |
838 | { |
839 | acpi_status status = AE_OK; | |
840 | int result = 0; | |
841 | /* | |
842 | * Context | |
843 | * ------- | |
844 | * Attach this 'struct acpi_device' to the ACPI object. This makes | |
845 | * resolutions from handle->device very efficient. Note that we need | |
846 | * to be careful with fixed-feature devices as they all attach to the | |
847 | * root object. | |
848 | */ | |
4be44fcd | 849 | if (type != ACPI_BUS_TYPE_POWER_BUTTON && |
1da177e4 LT |
850 | type != ACPI_BUS_TYPE_SLEEP_BUTTON) { |
851 | status = acpi_attach_data(device->handle, | |
4be44fcd | 852 | acpi_bus_data_handler, device); |
1da177e4 LT |
853 | |
854 | if (ACPI_FAILURE(status)) { | |
855 | printk("Error attaching device data\n"); | |
856 | result = -ENODEV; | |
857 | } | |
858 | } | |
859 | return result; | |
860 | } | |
861 | ||
4be44fcd LB |
862 | static void acpi_device_get_debug_info(struct acpi_device *device, |
863 | acpi_handle handle, int type) | |
1da177e4 LT |
864 | { |
865 | #ifdef CONFIG_ACPI_DEBUG_OUTPUT | |
4be44fcd LB |
866 | char *type_string = NULL; |
867 | char name[80] = { '?', '\0' }; | |
868 | struct acpi_buffer buffer = { sizeof(name), name }; | |
1da177e4 LT |
869 | |
870 | switch (type) { | |
871 | case ACPI_BUS_TYPE_DEVICE: | |
872 | type_string = "Device"; | |
873 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
874 | break; | |
875 | case ACPI_BUS_TYPE_POWER: | |
876 | type_string = "Power Resource"; | |
877 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
878 | break; | |
879 | case ACPI_BUS_TYPE_PROCESSOR: | |
880 | type_string = "Processor"; | |
881 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
882 | break; | |
883 | case ACPI_BUS_TYPE_SYSTEM: | |
884 | type_string = "System"; | |
885 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
886 | break; | |
887 | case ACPI_BUS_TYPE_THERMAL: | |
888 | type_string = "Thermal Zone"; | |
889 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
890 | break; | |
891 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
892 | type_string = "Power Button"; | |
893 | sprintf(name, "PWRB"); | |
894 | break; | |
895 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
896 | type_string = "Sleep Button"; | |
897 | sprintf(name, "SLPB"); | |
898 | break; | |
899 | } | |
900 | ||
901 | printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle); | |
4be44fcd | 902 | #endif /*CONFIG_ACPI_DEBUG_OUTPUT */ |
1da177e4 LT |
903 | } |
904 | ||
4be44fcd | 905 | static int acpi_bus_remove(struct acpi_device *dev, int rmdevice) |
1da177e4 | 906 | { |
4be44fcd LB |
907 | int result = 0; |
908 | struct acpi_driver *driver; | |
909 | ||
1da177e4 LT |
910 | |
911 | if (!dev) | |
d550d98d | 912 | return -EINVAL; |
1da177e4 LT |
913 | |
914 | driver = dev->driver; | |
915 | ||
916 | if ((driver) && (driver->ops.remove)) { | |
917 | ||
918 | if (driver->ops.stop) { | |
919 | result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT); | |
920 | if (result) | |
d550d98d | 921 | return result; |
1da177e4 LT |
922 | } |
923 | ||
924 | result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT); | |
925 | if (result) { | |
d550d98d | 926 | return result; |
1da177e4 LT |
927 | } |
928 | ||
929 | atomic_dec(&dev->driver->references); | |
930 | dev->driver = NULL; | |
931 | acpi_driver_data(dev) = NULL; | |
932 | } | |
933 | ||
934 | if (!rmdevice) | |
d550d98d | 935 | return 0; |
1da177e4 LT |
936 | |
937 | if (dev->flags.bus_address) { | |
938 | if ((dev->parent) && (dev->parent->ops.unbind)) | |
939 | dev->parent->ops.unbind(dev); | |
940 | } | |
4be44fcd | 941 | |
1da177e4 LT |
942 | acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT); |
943 | ||
d550d98d | 944 | return 0; |
1da177e4 LT |
945 | } |
946 | ||
3fb02738 | 947 | static int |
4be44fcd LB |
948 | acpi_add_single_object(struct acpi_device **child, |
949 | struct acpi_device *parent, acpi_handle handle, int type) | |
1da177e4 | 950 | { |
4be44fcd LB |
951 | int result = 0; |
952 | struct acpi_device *device = NULL; | |
1da177e4 | 953 | |
1da177e4 LT |
954 | |
955 | if (!child) | |
d550d98d | 956 | return -EINVAL; |
1da177e4 LT |
957 | |
958 | device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL); | |
959 | if (!device) { | |
6468463a | 960 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
d550d98d | 961 | return -ENOMEM; |
1da177e4 LT |
962 | } |
963 | memset(device, 0, sizeof(struct acpi_device)); | |
964 | ||
965 | device->handle = handle; | |
966 | device->parent = parent; | |
967 | ||
4be44fcd | 968 | acpi_device_get_busid(device, handle, type); |
1da177e4 LT |
969 | |
970 | /* | |
971 | * Flags | |
972 | * ----- | |
973 | * Get prior to calling acpi_bus_get_status() so we know whether | |
974 | * or not _STA is present. Note that we only look for object | |
975 | * handles -- cannot evaluate objects until we know the device is | |
976 | * present and properly initialized. | |
977 | */ | |
978 | result = acpi_bus_get_flags(device); | |
979 | if (result) | |
980 | goto end; | |
981 | ||
982 | /* | |
983 | * Status | |
984 | * ------ | |
6940faba KT |
985 | * See if the device is present. We always assume that non-Device |
986 | * and non-Processor objects (e.g. thermal zones, power resources, | |
987 | * etc.) are present, functioning, etc. (at least when parent object | |
988 | * is present). Note that _STA has a different meaning for some | |
989 | * objects (e.g. power resources) so we need to be careful how we use | |
990 | * it. | |
1da177e4 LT |
991 | */ |
992 | switch (type) { | |
6940faba | 993 | case ACPI_BUS_TYPE_PROCESSOR: |
1da177e4 LT |
994 | case ACPI_BUS_TYPE_DEVICE: |
995 | result = acpi_bus_get_status(device); | |
996 | if (ACPI_FAILURE(result) || !device->status.present) { | |
997 | result = -ENOENT; | |
998 | goto end; | |
999 | } | |
1000 | break; | |
1001 | default: | |
1002 | STRUCT_TO_INT(device->status) = 0x0F; | |
1003 | break; | |
1004 | } | |
1005 | ||
1006 | /* | |
1007 | * Initialize Device | |
1008 | * ----------------- | |
1009 | * TBD: Synch with Core's enumeration/initialization process. | |
1010 | */ | |
1011 | ||
1012 | /* | |
1013 | * Hardware ID, Unique ID, & Bus Address | |
1014 | * ------------------------------------- | |
1015 | */ | |
4be44fcd | 1016 | acpi_device_set_id(device, parent, handle, type); |
1da177e4 LT |
1017 | |
1018 | /* | |
1019 | * Power Management | |
1020 | * ---------------- | |
1021 | */ | |
1022 | if (device->flags.power_manageable) { | |
1023 | result = acpi_bus_get_power_flags(device); | |
1024 | if (result) | |
1025 | goto end; | |
1026 | } | |
1027 | ||
4be44fcd | 1028 | /* |
1da177e4 LT |
1029 | * Wakeup device management |
1030 | *----------------------- | |
1031 | */ | |
1032 | if (device->flags.wake_capable) { | |
1033 | result = acpi_bus_get_wakeup_device_flags(device); | |
1034 | if (result) | |
1035 | goto end; | |
1036 | } | |
1037 | ||
1038 | /* | |
1039 | * Performance Management | |
1040 | * ---------------------- | |
1041 | */ | |
1042 | if (device->flags.performance_manageable) { | |
1043 | result = acpi_bus_get_perf_flags(device); | |
1044 | if (result) | |
1045 | goto end; | |
1046 | } | |
1047 | ||
4be44fcd | 1048 | if ((result = acpi_device_set_context(device, type))) |
1da177e4 LT |
1049 | goto end; |
1050 | ||
4be44fcd | 1051 | acpi_device_get_debug_info(device, handle, type); |
1da177e4 | 1052 | |
4be44fcd | 1053 | acpi_device_register(device, parent); |
1da177e4 LT |
1054 | |
1055 | /* | |
1056 | * Bind _ADR-Based Devices | |
1057 | * ----------------------- | |
1058 | * If there's a a bus address (_ADR) then we utilize the parent's | |
1059 | * 'bind' function (if exists) to bind the ACPI- and natively- | |
1060 | * enumerated device representations. | |
1061 | */ | |
1062 | if (device->flags.bus_address) { | |
1063 | if (device->parent && device->parent->ops.bind) | |
1064 | device->parent->ops.bind(device); | |
1065 | } | |
1066 | ||
1067 | /* | |
1068 | * Locate & Attach Driver | |
1069 | * ---------------------- | |
1070 | * If there's a hardware id (_HID) or compatible ids (_CID) we check | |
1071 | * to see if there's a driver installed for this kind of device. Note | |
1072 | * that drivers can install before or after a device is enumerated. | |
1073 | * | |
1074 | * TBD: Assumes LDM provides driver hot-plug capability. | |
1075 | */ | |
bd7ce5b5 | 1076 | acpi_bus_find_driver(device); |
1da177e4 | 1077 | |
4be44fcd | 1078 | end: |
1da177e4 LT |
1079 | if (!result) |
1080 | *child = device; | |
1081 | else { | |
6044ec88 | 1082 | kfree(device->pnp.cid_list); |
1da177e4 LT |
1083 | kfree(device); |
1084 | } | |
1085 | ||
d550d98d | 1086 | return result; |
1da177e4 | 1087 | } |
1da177e4 | 1088 | |
4be44fcd | 1089 | static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops) |
1da177e4 | 1090 | { |
4be44fcd LB |
1091 | acpi_status status = AE_OK; |
1092 | struct acpi_device *parent = NULL; | |
1093 | struct acpi_device *child = NULL; | |
1094 | acpi_handle phandle = NULL; | |
1095 | acpi_handle chandle = NULL; | |
1096 | acpi_object_type type = 0; | |
1097 | u32 level = 1; | |
1da177e4 | 1098 | |
1da177e4 LT |
1099 | |
1100 | if (!start) | |
d550d98d | 1101 | return -EINVAL; |
1da177e4 LT |
1102 | |
1103 | parent = start; | |
1104 | phandle = start->handle; | |
4be44fcd | 1105 | |
1da177e4 LT |
1106 | /* |
1107 | * Parse through the ACPI namespace, identify all 'devices', and | |
1108 | * create a new 'struct acpi_device' for each. | |
1109 | */ | |
1110 | while ((level > 0) && parent) { | |
1111 | ||
1112 | status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, | |
4be44fcd | 1113 | chandle, &chandle); |
1da177e4 LT |
1114 | |
1115 | /* | |
1116 | * If this scope is exhausted then move our way back up. | |
1117 | */ | |
1118 | if (ACPI_FAILURE(status)) { | |
1119 | level--; | |
1120 | chandle = phandle; | |
1121 | acpi_get_parent(phandle, &phandle); | |
1122 | if (parent->parent) | |
1123 | parent = parent->parent; | |
1124 | continue; | |
1125 | } | |
1126 | ||
1127 | status = acpi_get_type(chandle, &type); | |
1128 | if (ACPI_FAILURE(status)) | |
1129 | continue; | |
1130 | ||
1131 | /* | |
1132 | * If this is a scope object then parse it (depth-first). | |
1133 | */ | |
1134 | if (type == ACPI_TYPE_LOCAL_SCOPE) { | |
1135 | level++; | |
1136 | phandle = chandle; | |
1137 | chandle = NULL; | |
1138 | continue; | |
1139 | } | |
1140 | ||
1141 | /* | |
1142 | * We're only interested in objects that we consider 'devices'. | |
1143 | */ | |
1144 | switch (type) { | |
1145 | case ACPI_TYPE_DEVICE: | |
1146 | type = ACPI_BUS_TYPE_DEVICE; | |
1147 | break; | |
1148 | case ACPI_TYPE_PROCESSOR: | |
1149 | type = ACPI_BUS_TYPE_PROCESSOR; | |
1150 | break; | |
1151 | case ACPI_TYPE_THERMAL: | |
1152 | type = ACPI_BUS_TYPE_THERMAL; | |
1153 | break; | |
1154 | case ACPI_TYPE_POWER: | |
1155 | type = ACPI_BUS_TYPE_POWER; | |
1156 | break; | |
1157 | default: | |
1158 | continue; | |
1159 | } | |
1160 | ||
3fb02738 RS |
1161 | if (ops->acpi_op_add) |
1162 | status = acpi_add_single_object(&child, parent, | |
4be44fcd LB |
1163 | chandle, type); |
1164 | else | |
3fb02738 RS |
1165 | status = acpi_bus_get_device(chandle, &child); |
1166 | ||
4be44fcd LB |
1167 | if (ACPI_FAILURE(status)) |
1168 | continue; | |
3fb02738 RS |
1169 | |
1170 | if (ops->acpi_op_start) { | |
1171 | status = acpi_start_single_object(child); | |
1172 | if (ACPI_FAILURE(status)) | |
1173 | continue; | |
1174 | } | |
1da177e4 LT |
1175 | |
1176 | /* | |
1177 | * If the device is present, enabled, and functioning then | |
1178 | * parse its scope (depth-first). Note that we need to | |
1179 | * represent absent devices to facilitate PnP notifications | |
1180 | * -- but only the subtree head (not all of its children, | |
1181 | * which will be enumerated when the parent is inserted). | |
1182 | * | |
1183 | * TBD: Need notifications and other detection mechanisms | |
4be44fcd | 1184 | * in place before we can fully implement this. |
1da177e4 LT |
1185 | */ |
1186 | if (child->status.present) { | |
1187 | status = acpi_get_next_object(ACPI_TYPE_ANY, chandle, | |
1188 | NULL, NULL); | |
1189 | if (ACPI_SUCCESS(status)) { | |
1190 | level++; | |
1191 | phandle = chandle; | |
1192 | chandle = NULL; | |
1193 | parent = child; | |
1194 | } | |
1195 | } | |
1196 | } | |
1197 | ||
d550d98d | 1198 | return 0; |
1da177e4 | 1199 | } |
1da177e4 | 1200 | |
3fb02738 | 1201 | int |
4be44fcd LB |
1202 | acpi_bus_add(struct acpi_device **child, |
1203 | struct acpi_device *parent, acpi_handle handle, int type) | |
3fb02738 RS |
1204 | { |
1205 | int result; | |
1206 | struct acpi_bus_ops ops; | |
1207 | ||
3fb02738 RS |
1208 | |
1209 | result = acpi_add_single_object(child, parent, handle, type); | |
1210 | if (!result) { | |
1211 | memset(&ops, 0, sizeof(ops)); | |
1212 | ops.acpi_op_add = 1; | |
1213 | result = acpi_bus_scan(*child, &ops); | |
1214 | } | |
d550d98d | 1215 | return result; |
3fb02738 | 1216 | } |
4be44fcd | 1217 | |
3fb02738 RS |
1218 | EXPORT_SYMBOL(acpi_bus_add); |
1219 | ||
4be44fcd | 1220 | int acpi_bus_start(struct acpi_device *device) |
3fb02738 RS |
1221 | { |
1222 | int result; | |
1223 | struct acpi_bus_ops ops; | |
1224 | ||
3fb02738 RS |
1225 | |
1226 | if (!device) | |
d550d98d | 1227 | return -EINVAL; |
3fb02738 RS |
1228 | |
1229 | result = acpi_start_single_object(device); | |
1230 | if (!result) { | |
1231 | memset(&ops, 0, sizeof(ops)); | |
1232 | ops.acpi_op_start = 1; | |
1233 | result = acpi_bus_scan(device, &ops); | |
1234 | } | |
d550d98d | 1235 | return result; |
3fb02738 | 1236 | } |
4be44fcd | 1237 | |
3fb02738 | 1238 | EXPORT_SYMBOL(acpi_bus_start); |
1da177e4 | 1239 | |
ceaba663 | 1240 | int acpi_bus_trim(struct acpi_device *start, int rmdevice) |
1da177e4 | 1241 | { |
4be44fcd LB |
1242 | acpi_status status; |
1243 | struct acpi_device *parent, *child; | |
1244 | acpi_handle phandle, chandle; | |
1245 | acpi_object_type type; | |
1246 | u32 level = 1; | |
1247 | int err = 0; | |
1248 | ||
1249 | parent = start; | |
1da177e4 LT |
1250 | phandle = start->handle; |
1251 | child = chandle = NULL; | |
1252 | ||
1253 | while ((level > 0) && parent && (!err)) { | |
1254 | status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, | |
4be44fcd | 1255 | chandle, &chandle); |
1da177e4 LT |
1256 | |
1257 | /* | |
1258 | * If this scope is exhausted then move our way back up. | |
1259 | */ | |
1260 | if (ACPI_FAILURE(status)) { | |
1261 | level--; | |
1262 | chandle = phandle; | |
1263 | acpi_get_parent(phandle, &phandle); | |
1264 | child = parent; | |
1265 | parent = parent->parent; | |
1266 | ||
1267 | if (level == 0) | |
1268 | err = acpi_bus_remove(child, rmdevice); | |
1269 | else | |
1270 | err = acpi_bus_remove(child, 1); | |
1271 | ||
1272 | continue; | |
1273 | } | |
1274 | ||
1275 | status = acpi_get_type(chandle, &type); | |
1276 | if (ACPI_FAILURE(status)) { | |
1277 | continue; | |
1278 | } | |
1279 | /* | |
1280 | * If there is a device corresponding to chandle then | |
1281 | * parse it (depth-first). | |
1282 | */ | |
1283 | if (acpi_bus_get_device(chandle, &child) == 0) { | |
1284 | level++; | |
1285 | phandle = chandle; | |
1286 | chandle = NULL; | |
1287 | parent = child; | |
1288 | } | |
1289 | continue; | |
1290 | } | |
1291 | return err; | |
1292 | } | |
ceaba663 KA |
1293 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
1294 | ||
1da177e4 | 1295 | |
4be44fcd | 1296 | static int acpi_bus_scan_fixed(struct acpi_device *root) |
1da177e4 | 1297 | { |
4be44fcd LB |
1298 | int result = 0; |
1299 | struct acpi_device *device = NULL; | |
1da177e4 | 1300 | |
1da177e4 LT |
1301 | |
1302 | if (!root) | |
d550d98d | 1303 | return -ENODEV; |
1da177e4 LT |
1304 | |
1305 | /* | |
1306 | * Enumerate all fixed-feature devices. | |
1307 | */ | |
3fb02738 RS |
1308 | if (acpi_fadt.pwr_button == 0) { |
1309 | result = acpi_add_single_object(&device, acpi_root, | |
4be44fcd LB |
1310 | NULL, |
1311 | ACPI_BUS_TYPE_POWER_BUTTON); | |
3fb02738 RS |
1312 | if (!result) |
1313 | result = acpi_start_single_object(device); | |
1314 | } | |
1da177e4 | 1315 | |
3fb02738 RS |
1316 | if (acpi_fadt.sleep_button == 0) { |
1317 | result = acpi_add_single_object(&device, acpi_root, | |
4be44fcd LB |
1318 | NULL, |
1319 | ACPI_BUS_TYPE_SLEEP_BUTTON); | |
3fb02738 RS |
1320 | if (!result) |
1321 | result = acpi_start_single_object(device); | |
1322 | } | |
1da177e4 | 1323 | |
d550d98d | 1324 | return result; |
1da177e4 LT |
1325 | } |
1326 | ||
5b327265 | 1327 | |
531881d6 | 1328 | static inline struct acpi_device * to_acpi_dev(struct device * dev) |
5b327265 PM |
1329 | { |
1330 | return container_of(dev, struct acpi_device, dev); | |
1331 | } | |
1332 | ||
1333 | ||
531881d6 | 1334 | static int root_suspend(struct acpi_device * acpi_dev, pm_message_t state) |
5b327265 PM |
1335 | { |
1336 | struct acpi_device * dev, * next; | |
1337 | int result; | |
1338 | ||
1339 | spin_lock(&acpi_device_lock); | |
1340 | list_for_each_entry_safe_reverse(dev, next, &acpi_device_list, g_list) { | |
1341 | if (dev->driver && dev->driver->ops.suspend) { | |
1342 | spin_unlock(&acpi_device_lock); | |
5b327265 PM |
1343 | result = dev->driver->ops.suspend(dev, 0); |
1344 | if (result) { | |
1345 | printk(KERN_ERR PREFIX "[%s - %s] Suspend failed: %d\n", | |
1346 | acpi_device_name(dev), | |
1347 | acpi_device_bid(dev), result); | |
1348 | } | |
1349 | spin_lock(&acpi_device_lock); | |
1350 | } | |
1351 | } | |
1352 | spin_unlock(&acpi_device_lock); | |
1353 | return 0; | |
1354 | } | |
1355 | ||
1356 | ||
1357 | static int acpi_device_suspend(struct device * dev, pm_message_t state) | |
1358 | { | |
1359 | struct acpi_device * acpi_dev = to_acpi_dev(dev); | |
1360 | ||
1361 | /* | |
1362 | * For now, we should only register 1 generic device - | |
1363 | * the ACPI root device - and from there, we walk the | |
1364 | * tree of ACPI devices to suspend each one using the | |
1365 | * ACPI driver methods. | |
1366 | */ | |
1367 | if (acpi_dev->handle == ACPI_ROOT_OBJECT) | |
531881d6 | 1368 | root_suspend(acpi_dev, state); |
5b327265 PM |
1369 | return 0; |
1370 | } | |
1371 | ||
1372 | ||
1373 | ||
1374 | static int root_resume(struct acpi_device * acpi_dev) | |
1375 | { | |
1376 | struct acpi_device * dev, * next; | |
1377 | int result; | |
1378 | ||
1379 | spin_lock(&acpi_device_lock); | |
1380 | list_for_each_entry_safe(dev, next, &acpi_device_list, g_list) { | |
1381 | if (dev->driver && dev->driver->ops.resume) { | |
1382 | spin_unlock(&acpi_device_lock); | |
5b327265 PM |
1383 | result = dev->driver->ops.resume(dev, 0); |
1384 | if (result) { | |
1385 | printk(KERN_ERR PREFIX "[%s - %s] resume failed: %d\n", | |
1386 | acpi_device_name(dev), | |
1387 | acpi_device_bid(dev), result); | |
1388 | } | |
1389 | spin_lock(&acpi_device_lock); | |
1390 | } | |
1391 | } | |
1392 | spin_unlock(&acpi_device_lock); | |
1393 | return 0; | |
1394 | } | |
1395 | ||
1396 | ||
1397 | static int acpi_device_resume(struct device * dev) | |
1398 | { | |
1399 | struct acpi_device * acpi_dev = to_acpi_dev(dev); | |
1400 | ||
1401 | /* | |
1402 | * For now, we should only register 1 generic device - | |
1403 | * the ACPI root device - and from there, we walk the | |
1404 | * tree of ACPI devices to resume each one using the | |
1405 | * ACPI driver methods. | |
1406 | */ | |
1407 | if (acpi_dev->handle == ACPI_ROOT_OBJECT) | |
1408 | root_resume(acpi_dev); | |
1409 | return 0; | |
1410 | } | |
1411 | ||
1412 | ||
1413 | struct bus_type acpi_bus_type = { | |
1414 | .name = "acpi", | |
1415 | .suspend = acpi_device_suspend, | |
1416 | .resume = acpi_device_resume, | |
1417 | }; | |
1418 | ||
1419 | ||
1420 | ||
1da177e4 LT |
1421 | static int __init acpi_scan_init(void) |
1422 | { | |
1423 | int result; | |
3fb02738 | 1424 | struct acpi_bus_ops ops; |
1da177e4 | 1425 | |
1da177e4 LT |
1426 | |
1427 | if (acpi_disabled) | |
d550d98d | 1428 | return 0; |
1da177e4 LT |
1429 | |
1430 | kset_register(&acpi_namespace_kset); | |
1431 | ||
5b327265 PM |
1432 | result = bus_register(&acpi_bus_type); |
1433 | if (result) { | |
1434 | /* We don't want to quit even if we failed to add suspend/resume */ | |
1435 | printk(KERN_ERR PREFIX "Could not register bus type\n"); | |
1436 | } | |
1437 | ||
1da177e4 LT |
1438 | /* |
1439 | * Create the root device in the bus's device tree | |
1440 | */ | |
3fb02738 | 1441 | result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT, |
4be44fcd | 1442 | ACPI_BUS_TYPE_SYSTEM); |
1da177e4 LT |
1443 | if (result) |
1444 | goto Done; | |
1445 | ||
3fb02738 | 1446 | result = acpi_start_single_object(acpi_root); |
5b327265 PM |
1447 | if (result) |
1448 | goto Done; | |
1449 | ||
1450 | acpi_root->dev.bus = &acpi_bus_type; | |
1451 | snprintf(acpi_root->dev.bus_id, BUS_ID_SIZE, "%s", acpi_bus_type.name); | |
1452 | result = device_register(&acpi_root->dev); | |
1453 | if (result) { | |
1454 | /* We don't want to quit even if we failed to add suspend/resume */ | |
1455 | printk(KERN_ERR PREFIX "Could not register device\n"); | |
1456 | } | |
3fb02738 | 1457 | |
1da177e4 LT |
1458 | /* |
1459 | * Enumerate devices in the ACPI namespace. | |
1460 | */ | |
1461 | result = acpi_bus_scan_fixed(acpi_root); | |
3fb02738 RS |
1462 | if (!result) { |
1463 | memset(&ops, 0, sizeof(ops)); | |
1464 | ops.acpi_op_add = 1; | |
1465 | ops.acpi_op_start = 1; | |
1466 | result = acpi_bus_scan(acpi_root, &ops); | |
1467 | } | |
1da177e4 LT |
1468 | |
1469 | if (result) | |
1470 | acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL); | |
1471 | ||
4be44fcd | 1472 | Done: |
d550d98d | 1473 | return result; |
1da177e4 LT |
1474 | } |
1475 | ||
1476 | subsys_initcall(acpi_scan_init); |