Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * scan.c - support for transforming the ACPI namespace into individual objects | |
3 | */ | |
4 | ||
5 | #include <linux/module.h> | |
6 | #include <linux/init.h> | |
9b6d97b6 | 7 | #include <linux/kernel.h> |
1da177e4 LT |
8 | #include <linux/acpi.h> |
9 | ||
10 | #include <acpi/acpi_drivers.h> | |
11 | #include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */ | |
12 | ||
1da177e4 | 13 | #define _COMPONENT ACPI_BUS_COMPONENT |
4be44fcd | 14 | ACPI_MODULE_NAME("scan") |
1da177e4 | 15 | #define STRUCT_TO_INT(s) (*((int*)&s)) |
4be44fcd | 16 | extern struct acpi_device *acpi_root; |
1da177e4 LT |
17 | |
18 | #define ACPI_BUS_CLASS "system_bus" | |
19 | #define ACPI_BUS_HID "ACPI_BUS" | |
20 | #define ACPI_BUS_DRIVER_NAME "ACPI Bus Driver" | |
21 | #define ACPI_BUS_DEVICE_NAME "System Bus" | |
22 | ||
23 | static LIST_HEAD(acpi_device_list); | |
24 | DEFINE_SPINLOCK(acpi_device_lock); | |
25 | LIST_HEAD(acpi_wakeup_device_list); | |
26 | ||
1da177e4 | 27 | |
4be44fcd | 28 | static void acpi_device_release(struct kobject *kobj) |
1da177e4 | 29 | { |
4be44fcd | 30 | struct acpi_device *dev = container_of(kobj, struct acpi_device, kobj); |
6044ec88 | 31 | kfree(dev->pnp.cid_list); |
1da177e4 LT |
32 | kfree(dev); |
33 | } | |
34 | ||
35 | struct acpi_device_attribute { | |
36 | struct attribute attr; | |
4be44fcd LB |
37 | ssize_t(*show) (struct acpi_device *, char *); |
38 | ssize_t(*store) (struct acpi_device *, const char *, size_t); | |
1da177e4 LT |
39 | }; |
40 | ||
41 | typedef void acpi_device_sysfs_files(struct kobject *, | |
4be44fcd | 42 | const struct attribute *); |
1da177e4 LT |
43 | |
44 | static void setup_sys_fs_device_files(struct acpi_device *dev, | |
4be44fcd | 45 | acpi_device_sysfs_files * func); |
1da177e4 LT |
46 | |
47 | #define create_sysfs_device_files(dev) \ | |
48 | setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file) | |
49 | #define remove_sysfs_device_files(dev) \ | |
50 | setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file) | |
51 | ||
1d268b0a | 52 | #define to_acpi_dev(n) container_of(n, struct acpi_device, kobj) |
1da177e4 LT |
53 | #define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr); |
54 | ||
55 | static ssize_t acpi_device_attr_show(struct kobject *kobj, | |
4be44fcd | 56 | struct attribute *attr, char *buf) |
1da177e4 | 57 | { |
1d268b0a | 58 | struct acpi_device *device = to_acpi_dev(kobj); |
1da177e4 | 59 | struct acpi_device_attribute *attribute = to_handle_attr(attr); |
70f2817a | 60 | return attribute->show ? attribute->show(device, buf) : -EIO; |
1da177e4 LT |
61 | } |
62 | static ssize_t acpi_device_attr_store(struct kobject *kobj, | |
4be44fcd LB |
63 | struct attribute *attr, const char *buf, |
64 | size_t len) | |
1da177e4 | 65 | { |
1d268b0a | 66 | struct acpi_device *device = to_acpi_dev(kobj); |
1da177e4 | 67 | struct acpi_device_attribute *attribute = to_handle_attr(attr); |
70f2817a | 68 | return attribute->store ? attribute->store(device, buf, len) : -EIO; |
1da177e4 LT |
69 | } |
70 | ||
71 | static struct sysfs_ops acpi_device_sysfs_ops = { | |
4be44fcd LB |
72 | .show = acpi_device_attr_show, |
73 | .store = acpi_device_attr_store, | |
1da177e4 LT |
74 | }; |
75 | ||
76 | static struct kobj_type ktype_acpi_ns = { | |
4be44fcd LB |
77 | .sysfs_ops = &acpi_device_sysfs_ops, |
78 | .release = acpi_device_release, | |
1da177e4 LT |
79 | }; |
80 | ||
312c004d | 81 | static int namespace_uevent(struct kset *kset, struct kobject *kobj, |
1da177e4 LT |
82 | char **envp, int num_envp, char *buffer, |
83 | int buffer_size) | |
84 | { | |
1d268b0a | 85 | struct acpi_device *dev = to_acpi_dev(kobj); |
1da177e4 LT |
86 | int i = 0; |
87 | int len = 0; | |
88 | ||
89 | if (!dev->driver) | |
90 | return 0; | |
91 | ||
312c004d KS |
92 | if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, |
93 | "PHYSDEVDRIVER=%s", dev->driver->name)) | |
1da177e4 LT |
94 | return -ENOMEM; |
95 | ||
96 | envp[i] = NULL; | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
312c004d KS |
101 | static struct kset_uevent_ops namespace_uevent_ops = { |
102 | .uevent = &namespace_uevent, | |
1da177e4 LT |
103 | }; |
104 | ||
105 | static struct kset acpi_namespace_kset = { | |
4be44fcd LB |
106 | .kobj = { |
107 | .name = "namespace", | |
108 | }, | |
1da177e4 | 109 | .subsys = &acpi_subsys, |
4be44fcd | 110 | .ktype = &ktype_acpi_ns, |
312c004d | 111 | .uevent_ops = &namespace_uevent_ops, |
1da177e4 LT |
112 | }; |
113 | ||
1da177e4 | 114 | /* -------------------------------------------------------------------------- |
312c004d | 115 | ACPI sysfs device file support |
1da177e4 | 116 | -------------------------------------------------------------------------- */ |
4be44fcd LB |
117 | static ssize_t acpi_eject_store(struct acpi_device *device, |
118 | const char *buf, size_t count); | |
1da177e4 LT |
119 | |
120 | #define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \ | |
121 | static struct acpi_device_attribute acpi_device_attr_##_name = \ | |
122 | __ATTR(_name, _mode, _show, _store) | |
123 | ||
124 | ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); | |
125 | ||
126 | /** | |
127 | * setup_sys_fs_device_files - sets up the device files under device namespace | |
67be2dd1 MW |
128 | * @dev: acpi_device object |
129 | * @func: function pointer to create or destroy the device file | |
1da177e4 LT |
130 | */ |
131 | static void | |
4be44fcd LB |
132 | setup_sys_fs_device_files(struct acpi_device *dev, |
133 | acpi_device_sysfs_files * func) | |
1da177e4 | 134 | { |
4be44fcd LB |
135 | acpi_status status; |
136 | acpi_handle temp = NULL; | |
1da177e4 LT |
137 | |
138 | /* | |
139 | * If device has _EJ0, 'eject' file is created that is used to trigger | |
140 | * hot-removal function from userland. | |
141 | */ | |
142 | status = acpi_get_handle(dev->handle, "_EJ0", &temp); | |
143 | if (ACPI_SUCCESS(status)) | |
4be44fcd | 144 | (*(func)) (&dev->kobj, &acpi_device_attr_eject.attr); |
1da177e4 LT |
145 | } |
146 | ||
4be44fcd | 147 | static int acpi_eject_operation(acpi_handle handle, int lockable) |
1da177e4 LT |
148 | { |
149 | struct acpi_object_list arg_list; | |
150 | union acpi_object arg; | |
151 | acpi_status status = AE_OK; | |
152 | ||
153 | /* | |
154 | * TBD: evaluate _PS3? | |
155 | */ | |
156 | ||
157 | if (lockable) { | |
158 | arg_list.count = 1; | |
159 | arg_list.pointer = &arg; | |
160 | arg.type = ACPI_TYPE_INTEGER; | |
161 | arg.integer.value = 0; | |
162 | acpi_evaluate_object(handle, "_LCK", &arg_list, NULL); | |
163 | } | |
164 | ||
165 | arg_list.count = 1; | |
166 | arg_list.pointer = &arg; | |
167 | arg.type = ACPI_TYPE_INTEGER; | |
168 | arg.integer.value = 1; | |
169 | ||
170 | /* | |
171 | * TBD: _EJD support. | |
172 | */ | |
173 | ||
174 | status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL); | |
175 | if (ACPI_FAILURE(status)) { | |
4be44fcd | 176 | return (-ENODEV); |
1da177e4 LT |
177 | } |
178 | ||
4be44fcd | 179 | return (0); |
1da177e4 LT |
180 | } |
181 | ||
1da177e4 LT |
182 | static ssize_t |
183 | acpi_eject_store(struct acpi_device *device, const char *buf, size_t count) | |
184 | { | |
4be44fcd LB |
185 | int result; |
186 | int ret = count; | |
187 | int islockable; | |
188 | acpi_status status; | |
189 | acpi_handle handle; | |
190 | acpi_object_type type = 0; | |
1da177e4 LT |
191 | |
192 | if ((!count) || (buf[0] != '1')) { | |
193 | return -EINVAL; | |
194 | } | |
1da177e4 LT |
195 | #ifndef FORCE_EJECT |
196 | if (device->driver == NULL) { | |
197 | ret = -ENODEV; | |
198 | goto err; | |
199 | } | |
200 | #endif | |
201 | status = acpi_get_type(device->handle, &type); | |
4be44fcd | 202 | if (ACPI_FAILURE(status) || (!device->flags.ejectable)) { |
1da177e4 LT |
203 | ret = -ENODEV; |
204 | goto err; | |
205 | } | |
206 | ||
207 | islockable = device->flags.lockable; | |
208 | handle = device->handle; | |
209 | ||
eefa27a9 | 210 | result = acpi_bus_trim(device, 1); |
1da177e4 LT |
211 | |
212 | if (!result) | |
213 | result = acpi_eject_operation(handle, islockable); | |
214 | ||
215 | if (result) { | |
216 | ret = -EBUSY; | |
217 | } | |
4be44fcd | 218 | err: |
1da177e4 LT |
219 | return ret; |
220 | } | |
221 | ||
1da177e4 | 222 | /* -------------------------------------------------------------------------- |
9e89dde2 | 223 | ACPI Bus operations |
1da177e4 | 224 | -------------------------------------------------------------------------- */ |
5d9464a4 | 225 | static int acpi_device_suspend(struct device *dev, pm_message_t state) |
1da177e4 | 226 | { |
5d9464a4 PM |
227 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
228 | struct acpi_driver *acpi_drv = acpi_dev->driver; | |
9e89dde2 | 229 | |
5d9464a4 PM |
230 | if (acpi_drv && acpi_drv->ops.suspend) |
231 | return acpi_drv->ops.suspend(acpi_dev, state); | |
1da177e4 LT |
232 | return 0; |
233 | } | |
234 | ||
5d9464a4 | 235 | static int acpi_device_resume(struct device *dev) |
9e89dde2 | 236 | { |
5d9464a4 PM |
237 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
238 | struct acpi_driver *acpi_drv = acpi_dev->driver; | |
1da177e4 | 239 | |
5d9464a4 PM |
240 | if (acpi_drv && acpi_drv->ops.resume) |
241 | return acpi_drv->ops.resume(acpi_dev); | |
9e89dde2 ZR |
242 | return 0; |
243 | } | |
244 | ||
5d9464a4 | 245 | static int acpi_bus_match(struct device *dev, struct device_driver *drv) |
9e89dde2 | 246 | { |
5d9464a4 PM |
247 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
248 | struct acpi_driver *acpi_drv = to_acpi_driver(drv); | |
9e89dde2 | 249 | |
5d9464a4 PM |
250 | if (acpi_drv->ops.match) |
251 | return !acpi_drv->ops.match(acpi_dev, acpi_drv); | |
252 | return !acpi_match_ids(acpi_dev, acpi_drv->ids); | |
253 | } | |
254 | ||
255 | static int acpi_device_uevent(struct device *dev, char **envp, int num_envp, | |
256 | char *buffer, int buffer_size) | |
257 | { | |
258 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
259 | int i = 0, length = 0, ret = 0; | |
260 | ||
261 | if (acpi_dev->flags.hardware_id) | |
262 | ret = add_uevent_var(envp, num_envp, &i, | |
263 | buffer, buffer_size, &length, | |
264 | "HWID=%s", acpi_dev->pnp.hardware_id); | |
265 | if (ret) | |
266 | return -ENOMEM; | |
267 | if (acpi_dev->flags.compatible_ids) { | |
268 | int j; | |
269 | struct acpi_compatible_id_list *cid_list; | |
270 | ||
271 | cid_list = acpi_dev->pnp.cid_list; | |
272 | ||
273 | for (j = 0; j < cid_list->count; j++) { | |
274 | ret = add_uevent_var(envp, num_envp, &i, buffer, | |
275 | buffer_size, &length, "COMPTID=%s", | |
276 | cid_list->id[j].value); | |
277 | if (ret) | |
278 | return -ENOMEM; | |
9e89dde2 ZR |
279 | } |
280 | } | |
5d9464a4 PM |
281 | |
282 | envp[i] = NULL; | |
9e89dde2 ZR |
283 | return 0; |
284 | } | |
285 | ||
5d9464a4 PM |
286 | static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *); |
287 | static int acpi_start_single_object(struct acpi_device *); | |
288 | static int acpi_device_probe(struct device * dev) | |
9e89dde2 | 289 | { |
5d9464a4 PM |
290 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
291 | struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); | |
292 | int ret; | |
293 | ||
294 | ret = acpi_bus_driver_init(acpi_dev, acpi_drv); | |
295 | if (!ret) { | |
296 | acpi_start_single_object(acpi_dev); | |
297 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, | |
298 | "Found driver [%s] for device [%s]\n", | |
299 | acpi_drv->name, acpi_dev->pnp.bus_id)); | |
300 | get_device(dev); | |
301 | } | |
302 | return ret; | |
303 | } | |
9e89dde2 | 304 | |
5d9464a4 PM |
305 | static int acpi_device_remove(struct device * dev) |
306 | { | |
307 | struct acpi_device *acpi_dev = to_acpi_device(dev); | |
308 | struct acpi_driver *acpi_drv = acpi_dev->driver; | |
309 | ||
310 | if (acpi_drv) { | |
311 | if (acpi_drv->ops.stop) | |
312 | acpi_drv->ops.stop(acpi_dev, ACPI_BUS_REMOVAL_NORMAL); | |
313 | if (acpi_drv->ops.remove) | |
314 | acpi_drv->ops.remove(acpi_dev, ACPI_BUS_REMOVAL_NORMAL); | |
315 | } | |
316 | acpi_dev->driver = NULL; | |
317 | acpi_driver_data(dev) = NULL; | |
318 | ||
319 | put_device(dev); | |
9e89dde2 ZR |
320 | return 0; |
321 | } | |
1da177e4 | 322 | |
5d9464a4 | 323 | static void acpi_device_shutdown(struct device *dev) |
1da177e4 | 324 | { |
5d9464a4 PM |
325 | struct acpi_device *acpi_dev = to_acpi_device(dev); |
326 | struct acpi_driver *acpi_drv = acpi_dev->driver; | |
327 | ||
328 | if (acpi_drv && acpi_drv->ops.shutdown) | |
329 | acpi_drv->ops.shutdown(acpi_dev); | |
330 | ||
331 | return ; | |
1da177e4 LT |
332 | } |
333 | ||
9e89dde2 ZR |
334 | static struct bus_type acpi_bus_type = { |
335 | .name = "acpi", | |
336 | .suspend = acpi_device_suspend, | |
337 | .resume = acpi_device_resume, | |
5d9464a4 PM |
338 | .shutdown = acpi_device_shutdown, |
339 | .match = acpi_bus_match, | |
340 | .probe = acpi_device_probe, | |
341 | .remove = acpi_device_remove, | |
342 | .uevent = acpi_device_uevent, | |
9e89dde2 ZR |
343 | }; |
344 | ||
345 | static void acpi_device_register(struct acpi_device *device, | |
346 | struct acpi_device *parent) | |
347 | { | |
348 | int err; | |
349 | ||
350 | /* | |
351 | * Linkage | |
352 | * ------- | |
353 | * Link this device to its parent and siblings. | |
354 | */ | |
355 | INIT_LIST_HEAD(&device->children); | |
356 | INIT_LIST_HEAD(&device->node); | |
357 | INIT_LIST_HEAD(&device->g_list); | |
358 | INIT_LIST_HEAD(&device->wakeup_list); | |
359 | ||
360 | spin_lock(&acpi_device_lock); | |
361 | if (device->parent) { | |
362 | list_add_tail(&device->node, &device->parent->children); | |
363 | list_add_tail(&device->g_list, &device->parent->g_list); | |
364 | } else | |
365 | list_add_tail(&device->g_list, &acpi_device_list); | |
366 | if (device->wakeup.flags.valid) | |
367 | list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); | |
368 | spin_unlock(&acpi_device_lock); | |
369 | ||
370 | strlcpy(device->kobj.name, device->pnp.bus_id, KOBJ_NAME_LEN); | |
371 | if (parent) | |
372 | device->kobj.parent = &parent->kobj; | |
373 | device->kobj.ktype = &ktype_acpi_ns; | |
374 | device->kobj.kset = &acpi_namespace_kset; | |
375 | err = kobject_register(&device->kobj); | |
376 | if (err < 0) | |
377 | printk(KERN_WARNING "%s: kobject_register error: %d\n", | |
378 | __FUNCTION__, err); | |
379 | create_sysfs_device_files(device); | |
380 | } | |
381 | ||
382 | static void acpi_device_unregister(struct acpi_device *device, int type) | |
383 | { | |
384 | spin_lock(&acpi_device_lock); | |
385 | if (device->parent) { | |
386 | list_del(&device->node); | |
387 | list_del(&device->g_list); | |
388 | } else | |
389 | list_del(&device->g_list); | |
390 | ||
391 | list_del(&device->wakeup_list); | |
392 | ||
393 | spin_unlock(&acpi_device_lock); | |
394 | ||
395 | acpi_detach_data(device->handle, acpi_bus_data_handler); | |
396 | remove_sysfs_device_files(device); | |
397 | kobject_unregister(&device->kobj); | |
398 | } | |
399 | ||
400 | /* -------------------------------------------------------------------------- | |
401 | Driver Management | |
402 | -------------------------------------------------------------------------- */ | |
403 | static LIST_HEAD(acpi_bus_drivers); | |
404 | ||
1da177e4 | 405 | /** |
d758a8fa RD |
406 | * acpi_bus_driver_init - add a device to a driver |
407 | * @device: the device to add and initialize | |
408 | * @driver: driver for the device | |
409 | * | |
1da177e4 LT |
410 | * Used to initialize a device via its device driver. Called whenever a |
411 | * driver is bound to a device. Invokes the driver's add() and start() ops. | |
412 | */ | |
413 | static int | |
4be44fcd | 414 | acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver) |
1da177e4 | 415 | { |
4be44fcd | 416 | int result = 0; |
1da177e4 | 417 | |
1da177e4 LT |
418 | |
419 | if (!device || !driver) | |
d550d98d | 420 | return -EINVAL; |
1da177e4 LT |
421 | |
422 | if (!driver->ops.add) | |
d550d98d | 423 | return -ENOSYS; |
1da177e4 LT |
424 | |
425 | result = driver->ops.add(device); | |
426 | if (result) { | |
427 | device->driver = NULL; | |
428 | acpi_driver_data(device) = NULL; | |
d550d98d | 429 | return result; |
1da177e4 LT |
430 | } |
431 | ||
432 | device->driver = driver; | |
433 | ||
434 | /* | |
435 | * TBD - Configuration Management: Assign resources to device based | |
436 | * upon possible configuration and currently allocated resources. | |
437 | */ | |
438 | ||
4be44fcd LB |
439 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
440 | "Driver successfully bound to device\n")); | |
d550d98d | 441 | return 0; |
3fb02738 RS |
442 | } |
443 | ||
8713cbef | 444 | static int acpi_start_single_object(struct acpi_device *device) |
3fb02738 RS |
445 | { |
446 | int result = 0; | |
447 | struct acpi_driver *driver; | |
448 | ||
3fb02738 RS |
449 | |
450 | if (!(driver = device->driver)) | |
d550d98d | 451 | return 0; |
3fb02738 | 452 | |
1da177e4 LT |
453 | if (driver->ops.start) { |
454 | result = driver->ops.start(device); | |
455 | if (result && driver->ops.remove) | |
456 | driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL); | |
1da177e4 LT |
457 | } |
458 | ||
d550d98d | 459 | return result; |
1da177e4 LT |
460 | } |
461 | ||
9d9f749b | 462 | static void acpi_driver_attach(struct acpi_driver *drv) |
1da177e4 | 463 | { |
4be44fcd | 464 | struct list_head *node, *next; |
1da177e4 | 465 | |
1da177e4 LT |
466 | |
467 | spin_lock(&acpi_device_lock); | |
468 | list_for_each_safe(node, next, &acpi_device_list) { | |
4be44fcd LB |
469 | struct acpi_device *dev = |
470 | container_of(node, struct acpi_device, g_list); | |
1da177e4 LT |
471 | |
472 | if (dev->driver || !dev->status.present) | |
473 | continue; | |
474 | spin_unlock(&acpi_device_lock); | |
475 | ||
5d9464a4 | 476 | if (!acpi_bus_match(&(dev->dev), &(drv->drv))) { |
1da177e4 | 477 | if (!acpi_bus_driver_init(dev, drv)) { |
3fb02738 | 478 | acpi_start_single_object(dev); |
1da177e4 | 479 | atomic_inc(&drv->references); |
4be44fcd LB |
480 | ACPI_DEBUG_PRINT((ACPI_DB_INFO, |
481 | "Found driver [%s] for device [%s]\n", | |
1da177e4 LT |
482 | drv->name, dev->pnp.bus_id)); |
483 | } | |
484 | } | |
485 | spin_lock(&acpi_device_lock); | |
486 | } | |
487 | spin_unlock(&acpi_device_lock); | |
1da177e4 LT |
488 | } |
489 | ||
06ea8e08 | 490 | static void acpi_driver_detach(struct acpi_driver *drv) |
1da177e4 | 491 | { |
4be44fcd | 492 | struct list_head *node, *next; |
1da177e4 | 493 | |
1da177e4 LT |
494 | |
495 | spin_lock(&acpi_device_lock); | |
4be44fcd LB |
496 | list_for_each_safe(node, next, &acpi_device_list) { |
497 | struct acpi_device *dev = | |
498 | container_of(node, struct acpi_device, g_list); | |
1da177e4 LT |
499 | |
500 | if (dev->driver == drv) { | |
501 | spin_unlock(&acpi_device_lock); | |
502 | if (drv->ops.remove) | |
4be44fcd | 503 | drv->ops.remove(dev, ACPI_BUS_REMOVAL_NORMAL); |
1da177e4 LT |
504 | spin_lock(&acpi_device_lock); |
505 | dev->driver = NULL; | |
506 | dev->driver_data = NULL; | |
507 | atomic_dec(&drv->references); | |
508 | } | |
509 | } | |
9e89dde2 ZR |
510 | spin_unlock(&acpi_device_lock); |
511 | } | |
512 | ||
513 | /** | |
514 | * acpi_bus_register_driver - register a driver with the ACPI bus | |
515 | * @driver: driver being registered | |
516 | * | |
517 | * Registers a driver with the ACPI bus. Searches the namespace for all | |
518 | * devices that match the driver's criteria and binds. Returns zero for | |
519 | * success or a negative error status for failure. | |
520 | */ | |
521 | int acpi_bus_register_driver(struct acpi_driver *driver) | |
522 | { | |
523 | ||
524 | if (acpi_disabled) | |
525 | return -ENODEV; | |
526 | ||
527 | spin_lock(&acpi_device_lock); | |
528 | list_add_tail(&driver->node, &acpi_bus_drivers); | |
529 | spin_unlock(&acpi_device_lock); | |
530 | acpi_driver_attach(driver); | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
535 | EXPORT_SYMBOL(acpi_bus_register_driver); | |
536 | ||
537 | /** | |
538 | * acpi_bus_unregister_driver - unregisters a driver with the APIC bus | |
539 | * @driver: driver to unregister | |
540 | * | |
541 | * Unregisters a driver with the ACPI bus. Searches the namespace for all | |
542 | * devices that match the driver's criteria and unbinds. | |
543 | */ | |
544 | void acpi_bus_unregister_driver(struct acpi_driver *driver) | |
545 | { | |
546 | acpi_driver_detach(driver); | |
547 | ||
548 | if (!atomic_read(&driver->references)) { | |
549 | spin_lock(&acpi_device_lock); | |
550 | list_del_init(&driver->node); | |
551 | spin_unlock(&acpi_device_lock); | |
552 | } | |
553 | return; | |
554 | } | |
555 | ||
556 | EXPORT_SYMBOL(acpi_bus_unregister_driver); | |
557 | ||
558 | /** | |
559 | * acpi_bus_find_driver - check if there is a driver installed for the device | |
560 | * @device: device that we are trying to find a supporting driver for | |
561 | * | |
562 | * Parses the list of registered drivers looking for a driver applicable for | |
563 | * the specified device. | |
564 | */ | |
565 | static int acpi_bus_find_driver(struct acpi_device *device) | |
566 | { | |
567 | int result = 0; | |
568 | struct list_head *node, *next; | |
569 | ||
570 | ||
571 | spin_lock(&acpi_device_lock); | |
572 | list_for_each_safe(node, next, &acpi_bus_drivers) { | |
573 | struct acpi_driver *driver = | |
574 | container_of(node, struct acpi_driver, node); | |
575 | ||
576 | atomic_inc(&driver->references); | |
577 | spin_unlock(&acpi_device_lock); | |
5d9464a4 | 578 | if (!acpi_bus_match(&(device->dev), &(driver->drv))) { |
9e89dde2 ZR |
579 | result = acpi_bus_driver_init(device, driver); |
580 | if (!result) | |
581 | goto Done; | |
582 | } | |
583 | atomic_dec(&driver->references); | |
584 | spin_lock(&acpi_device_lock); | |
585 | } | |
586 | spin_unlock(&acpi_device_lock); | |
587 | ||
588 | Done: | |
589 | return result; | |
590 | } | |
591 | ||
592 | /* -------------------------------------------------------------------------- | |
593 | Device Enumeration | |
594 | -------------------------------------------------------------------------- */ | |
595 | acpi_status | |
596 | acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) | |
597 | { | |
598 | acpi_status status; | |
599 | acpi_handle tmp; | |
600 | struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; | |
601 | union acpi_object *obj; | |
602 | ||
603 | status = acpi_get_handle(handle, "_EJD", &tmp); | |
604 | if (ACPI_FAILURE(status)) | |
605 | return status; | |
606 | ||
607 | status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); | |
608 | if (ACPI_SUCCESS(status)) { | |
609 | obj = buffer.pointer; | |
610 | status = acpi_get_handle(NULL, obj->string.pointer, ejd); | |
611 | kfree(buffer.pointer); | |
612 | } | |
613 | return status; | |
614 | } | |
615 | EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); | |
616 | ||
617 | void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context) | |
618 | { | |
619 | ||
620 | /* TBD */ | |
621 | ||
622 | return; | |
623 | } | |
624 | ||
625 | int acpi_match_ids(struct acpi_device *device, char *ids) | |
626 | { | |
627 | if (device->flags.hardware_id) | |
628 | if (strstr(ids, device->pnp.hardware_id)) | |
629 | return 0; | |
630 | ||
631 | if (device->flags.compatible_ids) { | |
632 | struct acpi_compatible_id_list *cid_list = device->pnp.cid_list; | |
633 | int i; | |
634 | ||
635 | /* compare multiple _CID entries against driver ids */ | |
636 | for (i = 0; i < cid_list->count; i++) { | |
637 | if (strstr(ids, cid_list->id[i].value)) | |
638 | return 0; | |
639 | } | |
640 | } | |
641 | return -ENOENT; | |
642 | } | |
643 | ||
644 | static int acpi_bus_get_perf_flags(struct acpi_device *device) | |
645 | { | |
646 | device->performance.state = ACPI_STATE_UNKNOWN; | |
647 | return 0; | |
648 | } | |
649 | ||
650 | static acpi_status | |
651 | acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device, | |
652 | union acpi_object *package) | |
653 | { | |
654 | int i = 0; | |
655 | union acpi_object *element = NULL; | |
656 | ||
657 | if (!device || !package || (package->package.count < 2)) | |
658 | return AE_BAD_PARAMETER; | |
659 | ||
660 | element = &(package->package.elements[0]); | |
661 | if (!element) | |
662 | return AE_BAD_PARAMETER; | |
663 | if (element->type == ACPI_TYPE_PACKAGE) { | |
664 | if ((element->package.count < 2) || | |
665 | (element->package.elements[0].type != | |
666 | ACPI_TYPE_LOCAL_REFERENCE) | |
667 | || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) | |
668 | return AE_BAD_DATA; | |
669 | device->wakeup.gpe_device = | |
670 | element->package.elements[0].reference.handle; | |
671 | device->wakeup.gpe_number = | |
672 | (u32) element->package.elements[1].integer.value; | |
673 | } else if (element->type == ACPI_TYPE_INTEGER) { | |
674 | device->wakeup.gpe_number = element->integer.value; | |
675 | } else | |
676 | return AE_BAD_DATA; | |
677 | ||
678 | element = &(package->package.elements[1]); | |
679 | if (element->type != ACPI_TYPE_INTEGER) { | |
680 | return AE_BAD_DATA; | |
681 | } | |
682 | device->wakeup.sleep_state = element->integer.value; | |
683 | ||
684 | if ((package->package.count - 2) > ACPI_MAX_HANDLES) { | |
685 | return AE_NO_MEMORY; | |
686 | } | |
687 | device->wakeup.resources.count = package->package.count - 2; | |
688 | for (i = 0; i < device->wakeup.resources.count; i++) { | |
689 | element = &(package->package.elements[i + 2]); | |
690 | if (element->type != ACPI_TYPE_ANY) { | |
691 | return AE_BAD_DATA; | |
692 | } | |
693 | ||
694 | device->wakeup.resources.handles[i] = element->reference.handle; | |
695 | } | |
696 | ||
697 | return AE_OK; | |
1da177e4 LT |
698 | } |
699 | ||
9e89dde2 | 700 | static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device) |
1da177e4 | 701 | { |
9e89dde2 ZR |
702 | acpi_status status = 0; |
703 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
704 | union acpi_object *package = NULL; | |
1da177e4 | 705 | |
1da177e4 | 706 | |
9e89dde2 ZR |
707 | /* _PRW */ |
708 | status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer); | |
709 | if (ACPI_FAILURE(status)) { | |
710 | ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); | |
711 | goto end; | |
712 | } | |
1da177e4 | 713 | |
9e89dde2 ZR |
714 | package = (union acpi_object *)buffer.pointer; |
715 | status = acpi_bus_extract_wakeup_device_power_package(device, package); | |
716 | if (ACPI_FAILURE(status)) { | |
717 | ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package")); | |
718 | goto end; | |
719 | } | |
1da177e4 | 720 | |
9e89dde2 | 721 | kfree(buffer.pointer); |
1da177e4 | 722 | |
9e89dde2 ZR |
723 | device->wakeup.flags.valid = 1; |
724 | /* Power button, Lid switch always enable wakeup */ | |
725 | if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E")) | |
726 | device->wakeup.flags.run_wake = 1; | |
1a365616 | 727 | |
9e89dde2 ZR |
728 | end: |
729 | if (ACPI_FAILURE(status)) | |
730 | device->flags.wake_capable = 0; | |
731 | return 0; | |
1da177e4 | 732 | } |
4be44fcd | 733 | |
9e89dde2 | 734 | static int acpi_bus_get_power_flags(struct acpi_device *device) |
1da177e4 | 735 | { |
9e89dde2 ZR |
736 | acpi_status status = 0; |
737 | acpi_handle handle = NULL; | |
738 | u32 i = 0; | |
1da177e4 | 739 | |
1da177e4 | 740 | |
9e89dde2 ZR |
741 | /* |
742 | * Power Management Flags | |
743 | */ | |
744 | status = acpi_get_handle(device->handle, "_PSC", &handle); | |
745 | if (ACPI_SUCCESS(status)) | |
746 | device->power.flags.explicit_get = 1; | |
747 | status = acpi_get_handle(device->handle, "_IRC", &handle); | |
748 | if (ACPI_SUCCESS(status)) | |
749 | device->power.flags.inrush_current = 1; | |
1da177e4 | 750 | |
9e89dde2 ZR |
751 | /* |
752 | * Enumerate supported power management states | |
753 | */ | |
754 | for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) { | |
755 | struct acpi_device_power_state *ps = &device->power.states[i]; | |
756 | char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' }; | |
757 | ||
758 | /* Evaluate "_PRx" to se if power resources are referenced */ | |
759 | acpi_evaluate_reference(device->handle, object_name, NULL, | |
760 | &ps->resources); | |
761 | if (ps->resources.count) { | |
762 | device->power.flags.power_resources = 1; | |
763 | ps->flags.valid = 1; | |
1da177e4 | 764 | } |
1da177e4 | 765 | |
9e89dde2 ZR |
766 | /* Evaluate "_PSx" to see if we can do explicit sets */ |
767 | object_name[2] = 'S'; | |
768 | status = acpi_get_handle(device->handle, object_name, &handle); | |
769 | if (ACPI_SUCCESS(status)) { | |
770 | ps->flags.explicit_set = 1; | |
771 | ps->flags.valid = 1; | |
772 | } | |
1da177e4 | 773 | |
9e89dde2 ZR |
774 | /* State is valid if we have some power control */ |
775 | if (ps->resources.count || ps->flags.explicit_set) | |
776 | ps->flags.valid = 1; | |
1da177e4 | 777 | |
9e89dde2 ZR |
778 | ps->power = -1; /* Unknown - driver assigned */ |
779 | ps->latency = -1; /* Unknown - driver assigned */ | |
780 | } | |
c8f7a62c | 781 | |
9e89dde2 ZR |
782 | /* Set defaults for D0 and D3 states (always valid) */ |
783 | device->power.states[ACPI_STATE_D0].flags.valid = 1; | |
784 | device->power.states[ACPI_STATE_D0].power = 100; | |
785 | device->power.states[ACPI_STATE_D3].flags.valid = 1; | |
786 | device->power.states[ACPI_STATE_D3].power = 0; | |
c8f7a62c | 787 | |
9e89dde2 ZR |
788 | /* TBD: System wake support and resource requirements. */ |
789 | ||
790 | device->power.state = ACPI_STATE_UNKNOWN; | |
c8f7a62c | 791 | |
9e89dde2 ZR |
792 | return 0; |
793 | } | |
c8f7a62c | 794 | |
4be44fcd | 795 | static int acpi_bus_get_flags(struct acpi_device *device) |
1da177e4 | 796 | { |
4be44fcd LB |
797 | acpi_status status = AE_OK; |
798 | acpi_handle temp = NULL; | |
1da177e4 | 799 | |
1da177e4 LT |
800 | |
801 | /* Presence of _STA indicates 'dynamic_status' */ | |
802 | status = acpi_get_handle(device->handle, "_STA", &temp); | |
803 | if (ACPI_SUCCESS(status)) | |
804 | device->flags.dynamic_status = 1; | |
805 | ||
806 | /* Presence of _CID indicates 'compatible_ids' */ | |
807 | status = acpi_get_handle(device->handle, "_CID", &temp); | |
808 | if (ACPI_SUCCESS(status)) | |
809 | device->flags.compatible_ids = 1; | |
810 | ||
811 | /* Presence of _RMV indicates 'removable' */ | |
812 | status = acpi_get_handle(device->handle, "_RMV", &temp); | |
813 | if (ACPI_SUCCESS(status)) | |
814 | device->flags.removable = 1; | |
815 | ||
816 | /* Presence of _EJD|_EJ0 indicates 'ejectable' */ | |
817 | status = acpi_get_handle(device->handle, "_EJD", &temp); | |
818 | if (ACPI_SUCCESS(status)) | |
819 | device->flags.ejectable = 1; | |
820 | else { | |
821 | status = acpi_get_handle(device->handle, "_EJ0", &temp); | |
822 | if (ACPI_SUCCESS(status)) | |
823 | device->flags.ejectable = 1; | |
824 | } | |
825 | ||
826 | /* Presence of _LCK indicates 'lockable' */ | |
827 | status = acpi_get_handle(device->handle, "_LCK", &temp); | |
828 | if (ACPI_SUCCESS(status)) | |
829 | device->flags.lockable = 1; | |
830 | ||
831 | /* Presence of _PS0|_PR0 indicates 'power manageable' */ | |
832 | status = acpi_get_handle(device->handle, "_PS0", &temp); | |
833 | if (ACPI_FAILURE(status)) | |
834 | status = acpi_get_handle(device->handle, "_PR0", &temp); | |
835 | if (ACPI_SUCCESS(status)) | |
836 | device->flags.power_manageable = 1; | |
837 | ||
838 | /* Presence of _PRW indicates wake capable */ | |
839 | status = acpi_get_handle(device->handle, "_PRW", &temp); | |
840 | if (ACPI_SUCCESS(status)) | |
841 | device->flags.wake_capable = 1; | |
842 | ||
843 | /* TBD: Peformance management */ | |
844 | ||
d550d98d | 845 | return 0; |
1da177e4 LT |
846 | } |
847 | ||
4be44fcd LB |
848 | static void acpi_device_get_busid(struct acpi_device *device, |
849 | acpi_handle handle, int type) | |
1da177e4 | 850 | { |
4be44fcd LB |
851 | char bus_id[5] = { '?', 0 }; |
852 | struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; | |
853 | int i = 0; | |
1da177e4 LT |
854 | |
855 | /* | |
856 | * Bus ID | |
857 | * ------ | |
858 | * The device's Bus ID is simply the object name. | |
859 | * TBD: Shouldn't this value be unique (within the ACPI namespace)? | |
860 | */ | |
861 | switch (type) { | |
862 | case ACPI_BUS_TYPE_SYSTEM: | |
863 | strcpy(device->pnp.bus_id, "ACPI"); | |
864 | break; | |
865 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
866 | strcpy(device->pnp.bus_id, "PWRF"); | |
867 | break; | |
868 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
869 | strcpy(device->pnp.bus_id, "SLPF"); | |
870 | break; | |
871 | default: | |
872 | acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); | |
873 | /* Clean up trailing underscores (if any) */ | |
874 | for (i = 3; i > 1; i--) { | |
875 | if (bus_id[i] == '_') | |
876 | bus_id[i] = '\0'; | |
877 | else | |
878 | break; | |
879 | } | |
880 | strcpy(device->pnp.bus_id, bus_id); | |
881 | break; | |
882 | } | |
883 | } | |
884 | ||
4be44fcd LB |
885 | static void acpi_device_set_id(struct acpi_device *device, |
886 | struct acpi_device *parent, acpi_handle handle, | |
887 | int type) | |
1da177e4 | 888 | { |
4be44fcd LB |
889 | struct acpi_device_info *info; |
890 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
891 | char *hid = NULL; | |
892 | char *uid = NULL; | |
1da177e4 | 893 | struct acpi_compatible_id_list *cid_list = NULL; |
4be44fcd | 894 | acpi_status status; |
1da177e4 LT |
895 | |
896 | switch (type) { | |
897 | case ACPI_BUS_TYPE_DEVICE: | |
898 | status = acpi_get_object_info(handle, &buffer); | |
899 | if (ACPI_FAILURE(status)) { | |
4be44fcd | 900 | printk("%s: Error reading device info\n", __FUNCTION__); |
1da177e4 LT |
901 | return; |
902 | } | |
903 | ||
904 | info = buffer.pointer; | |
905 | if (info->valid & ACPI_VALID_HID) | |
906 | hid = info->hardware_id.value; | |
907 | if (info->valid & ACPI_VALID_UID) | |
908 | uid = info->unique_id.value; | |
909 | if (info->valid & ACPI_VALID_CID) | |
910 | cid_list = &info->compatibility_id; | |
911 | if (info->valid & ACPI_VALID_ADR) { | |
912 | device->pnp.bus_address = info->address; | |
913 | device->flags.bus_address = 1; | |
914 | } | |
915 | break; | |
916 | case ACPI_BUS_TYPE_POWER: | |
917 | hid = ACPI_POWER_HID; | |
918 | break; | |
919 | case ACPI_BUS_TYPE_PROCESSOR: | |
920 | hid = ACPI_PROCESSOR_HID; | |
921 | break; | |
922 | case ACPI_BUS_TYPE_SYSTEM: | |
923 | hid = ACPI_SYSTEM_HID; | |
924 | break; | |
925 | case ACPI_BUS_TYPE_THERMAL: | |
926 | hid = ACPI_THERMAL_HID; | |
927 | break; | |
928 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
929 | hid = ACPI_BUTTON_HID_POWERF; | |
930 | break; | |
931 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
932 | hid = ACPI_BUTTON_HID_SLEEPF; | |
933 | break; | |
934 | } | |
935 | ||
936 | /* | |
937 | * \_SB | |
938 | * ---- | |
939 | * Fix for the system root bus device -- the only root-level device. | |
940 | */ | |
c51a4de8 | 941 | if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) { |
1da177e4 LT |
942 | hid = ACPI_BUS_HID; |
943 | strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME); | |
944 | strcpy(device->pnp.device_class, ACPI_BUS_CLASS); | |
945 | } | |
946 | ||
947 | if (hid) { | |
948 | strcpy(device->pnp.hardware_id, hid); | |
949 | device->flags.hardware_id = 1; | |
950 | } | |
951 | if (uid) { | |
952 | strcpy(device->pnp.unique_id, uid); | |
953 | device->flags.unique_id = 1; | |
954 | } | |
955 | if (cid_list) { | |
956 | device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL); | |
957 | if (device->pnp.cid_list) | |
958 | memcpy(device->pnp.cid_list, cid_list, cid_list->size); | |
959 | else | |
960 | printk(KERN_ERR "Memory allocation error\n"); | |
961 | } | |
962 | ||
02438d87 | 963 | kfree(buffer.pointer); |
1da177e4 LT |
964 | } |
965 | ||
4be44fcd | 966 | static int acpi_device_set_context(struct acpi_device *device, int type) |
1da177e4 LT |
967 | { |
968 | acpi_status status = AE_OK; | |
969 | int result = 0; | |
970 | /* | |
971 | * Context | |
972 | * ------- | |
973 | * Attach this 'struct acpi_device' to the ACPI object. This makes | |
974 | * resolutions from handle->device very efficient. Note that we need | |
975 | * to be careful with fixed-feature devices as they all attach to the | |
976 | * root object. | |
977 | */ | |
4be44fcd | 978 | if (type != ACPI_BUS_TYPE_POWER_BUTTON && |
1da177e4 LT |
979 | type != ACPI_BUS_TYPE_SLEEP_BUTTON) { |
980 | status = acpi_attach_data(device->handle, | |
4be44fcd | 981 | acpi_bus_data_handler, device); |
1da177e4 LT |
982 | |
983 | if (ACPI_FAILURE(status)) { | |
984 | printk("Error attaching device data\n"); | |
985 | result = -ENODEV; | |
986 | } | |
987 | } | |
988 | return result; | |
989 | } | |
990 | ||
4be44fcd LB |
991 | static void acpi_device_get_debug_info(struct acpi_device *device, |
992 | acpi_handle handle, int type) | |
1da177e4 LT |
993 | { |
994 | #ifdef CONFIG_ACPI_DEBUG_OUTPUT | |
4be44fcd LB |
995 | char *type_string = NULL; |
996 | char name[80] = { '?', '\0' }; | |
997 | struct acpi_buffer buffer = { sizeof(name), name }; | |
1da177e4 LT |
998 | |
999 | switch (type) { | |
1000 | case ACPI_BUS_TYPE_DEVICE: | |
1001 | type_string = "Device"; | |
1002 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
1003 | break; | |
1004 | case ACPI_BUS_TYPE_POWER: | |
1005 | type_string = "Power Resource"; | |
1006 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
1007 | break; | |
1008 | case ACPI_BUS_TYPE_PROCESSOR: | |
1009 | type_string = "Processor"; | |
1010 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
1011 | break; | |
1012 | case ACPI_BUS_TYPE_SYSTEM: | |
1013 | type_string = "System"; | |
1014 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
1015 | break; | |
1016 | case ACPI_BUS_TYPE_THERMAL: | |
1017 | type_string = "Thermal Zone"; | |
1018 | acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); | |
1019 | break; | |
1020 | case ACPI_BUS_TYPE_POWER_BUTTON: | |
1021 | type_string = "Power Button"; | |
1022 | sprintf(name, "PWRB"); | |
1023 | break; | |
1024 | case ACPI_BUS_TYPE_SLEEP_BUTTON: | |
1025 | type_string = "Sleep Button"; | |
1026 | sprintf(name, "SLPB"); | |
1027 | break; | |
1028 | } | |
1029 | ||
1030 | printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle); | |
4be44fcd | 1031 | #endif /*CONFIG_ACPI_DEBUG_OUTPUT */ |
1da177e4 LT |
1032 | } |
1033 | ||
4be44fcd | 1034 | static int acpi_bus_remove(struct acpi_device *dev, int rmdevice) |
1da177e4 | 1035 | { |
4be44fcd LB |
1036 | int result = 0; |
1037 | struct acpi_driver *driver; | |
1038 | ||
1da177e4 LT |
1039 | |
1040 | if (!dev) | |
d550d98d | 1041 | return -EINVAL; |
1da177e4 LT |
1042 | |
1043 | driver = dev->driver; | |
1044 | ||
1045 | if ((driver) && (driver->ops.remove)) { | |
1046 | ||
1047 | if (driver->ops.stop) { | |
1048 | result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT); | |
1049 | if (result) | |
d550d98d | 1050 | return result; |
1da177e4 LT |
1051 | } |
1052 | ||
1053 | result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT); | |
1054 | if (result) { | |
d550d98d | 1055 | return result; |
1da177e4 LT |
1056 | } |
1057 | ||
1058 | atomic_dec(&dev->driver->references); | |
1059 | dev->driver = NULL; | |
1060 | acpi_driver_data(dev) = NULL; | |
1061 | } | |
1062 | ||
1063 | if (!rmdevice) | |
d550d98d | 1064 | return 0; |
1da177e4 LT |
1065 | |
1066 | if (dev->flags.bus_address) { | |
1067 | if ((dev->parent) && (dev->parent->ops.unbind)) | |
1068 | dev->parent->ops.unbind(dev); | |
1069 | } | |
4be44fcd | 1070 | |
1da177e4 LT |
1071 | acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT); |
1072 | ||
d550d98d | 1073 | return 0; |
1da177e4 LT |
1074 | } |
1075 | ||
3fb02738 | 1076 | static int |
4be44fcd LB |
1077 | acpi_add_single_object(struct acpi_device **child, |
1078 | struct acpi_device *parent, acpi_handle handle, int type) | |
1da177e4 | 1079 | { |
4be44fcd LB |
1080 | int result = 0; |
1081 | struct acpi_device *device = NULL; | |
1da177e4 | 1082 | |
1da177e4 LT |
1083 | |
1084 | if (!child) | |
d550d98d | 1085 | return -EINVAL; |
1da177e4 LT |
1086 | |
1087 | device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL); | |
1088 | if (!device) { | |
6468463a | 1089 | printk(KERN_ERR PREFIX "Memory allocation error\n"); |
d550d98d | 1090 | return -ENOMEM; |
1da177e4 LT |
1091 | } |
1092 | memset(device, 0, sizeof(struct acpi_device)); | |
1093 | ||
1094 | device->handle = handle; | |
1095 | device->parent = parent; | |
1096 | ||
4be44fcd | 1097 | acpi_device_get_busid(device, handle, type); |
1da177e4 LT |
1098 | |
1099 | /* | |
1100 | * Flags | |
1101 | * ----- | |
1102 | * Get prior to calling acpi_bus_get_status() so we know whether | |
1103 | * or not _STA is present. Note that we only look for object | |
1104 | * handles -- cannot evaluate objects until we know the device is | |
1105 | * present and properly initialized. | |
1106 | */ | |
1107 | result = acpi_bus_get_flags(device); | |
1108 | if (result) | |
1109 | goto end; | |
1110 | ||
1111 | /* | |
1112 | * Status | |
1113 | * ------ | |
6940faba KT |
1114 | * See if the device is present. We always assume that non-Device |
1115 | * and non-Processor objects (e.g. thermal zones, power resources, | |
1116 | * etc.) are present, functioning, etc. (at least when parent object | |
1117 | * is present). Note that _STA has a different meaning for some | |
1118 | * objects (e.g. power resources) so we need to be careful how we use | |
1119 | * it. | |
1da177e4 LT |
1120 | */ |
1121 | switch (type) { | |
6940faba | 1122 | case ACPI_BUS_TYPE_PROCESSOR: |
1da177e4 LT |
1123 | case ACPI_BUS_TYPE_DEVICE: |
1124 | result = acpi_bus_get_status(device); | |
1125 | if (ACPI_FAILURE(result) || !device->status.present) { | |
1126 | result = -ENOENT; | |
1127 | goto end; | |
1128 | } | |
1129 | break; | |
1130 | default: | |
1131 | STRUCT_TO_INT(device->status) = 0x0F; | |
1132 | break; | |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * Initialize Device | |
1137 | * ----------------- | |
1138 | * TBD: Synch with Core's enumeration/initialization process. | |
1139 | */ | |
1140 | ||
1141 | /* | |
1142 | * Hardware ID, Unique ID, & Bus Address | |
1143 | * ------------------------------------- | |
1144 | */ | |
4be44fcd | 1145 | acpi_device_set_id(device, parent, handle, type); |
1da177e4 LT |
1146 | |
1147 | /* | |
1148 | * Power Management | |
1149 | * ---------------- | |
1150 | */ | |
1151 | if (device->flags.power_manageable) { | |
1152 | result = acpi_bus_get_power_flags(device); | |
1153 | if (result) | |
1154 | goto end; | |
1155 | } | |
1156 | ||
4be44fcd | 1157 | /* |
1da177e4 LT |
1158 | * Wakeup device management |
1159 | *----------------------- | |
1160 | */ | |
1161 | if (device->flags.wake_capable) { | |
1162 | result = acpi_bus_get_wakeup_device_flags(device); | |
1163 | if (result) | |
1164 | goto end; | |
1165 | } | |
1166 | ||
1167 | /* | |
1168 | * Performance Management | |
1169 | * ---------------------- | |
1170 | */ | |
1171 | if (device->flags.performance_manageable) { | |
1172 | result = acpi_bus_get_perf_flags(device); | |
1173 | if (result) | |
1174 | goto end; | |
1175 | } | |
1176 | ||
4be44fcd | 1177 | if ((result = acpi_device_set_context(device, type))) |
1da177e4 LT |
1178 | goto end; |
1179 | ||
4be44fcd | 1180 | acpi_device_get_debug_info(device, handle, type); |
1da177e4 | 1181 | |
4be44fcd | 1182 | acpi_device_register(device, parent); |
1da177e4 LT |
1183 | |
1184 | /* | |
1185 | * Bind _ADR-Based Devices | |
1186 | * ----------------------- | |
1187 | * If there's a a bus address (_ADR) then we utilize the parent's | |
1188 | * 'bind' function (if exists) to bind the ACPI- and natively- | |
1189 | * enumerated device representations. | |
1190 | */ | |
1191 | if (device->flags.bus_address) { | |
1192 | if (device->parent && device->parent->ops.bind) | |
1193 | device->parent->ops.bind(device); | |
1194 | } | |
1195 | ||
1196 | /* | |
1197 | * Locate & Attach Driver | |
1198 | * ---------------------- | |
1199 | * If there's a hardware id (_HID) or compatible ids (_CID) we check | |
1200 | * to see if there's a driver installed for this kind of device. Note | |
1201 | * that drivers can install before or after a device is enumerated. | |
1202 | * | |
1203 | * TBD: Assumes LDM provides driver hot-plug capability. | |
1204 | */ | |
bd7ce5b5 | 1205 | acpi_bus_find_driver(device); |
1da177e4 | 1206 | |
4be44fcd | 1207 | end: |
1da177e4 LT |
1208 | if (!result) |
1209 | *child = device; | |
1210 | else { | |
6044ec88 | 1211 | kfree(device->pnp.cid_list); |
1da177e4 LT |
1212 | kfree(device); |
1213 | } | |
1214 | ||
d550d98d | 1215 | return result; |
1da177e4 | 1216 | } |
1da177e4 | 1217 | |
4be44fcd | 1218 | static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops) |
1da177e4 | 1219 | { |
4be44fcd LB |
1220 | acpi_status status = AE_OK; |
1221 | struct acpi_device *parent = NULL; | |
1222 | struct acpi_device *child = NULL; | |
1223 | acpi_handle phandle = NULL; | |
1224 | acpi_handle chandle = NULL; | |
1225 | acpi_object_type type = 0; | |
1226 | u32 level = 1; | |
1da177e4 | 1227 | |
1da177e4 LT |
1228 | |
1229 | if (!start) | |
d550d98d | 1230 | return -EINVAL; |
1da177e4 LT |
1231 | |
1232 | parent = start; | |
1233 | phandle = start->handle; | |
4be44fcd | 1234 | |
1da177e4 LT |
1235 | /* |
1236 | * Parse through the ACPI namespace, identify all 'devices', and | |
1237 | * create a new 'struct acpi_device' for each. | |
1238 | */ | |
1239 | while ((level > 0) && parent) { | |
1240 | ||
1241 | status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, | |
4be44fcd | 1242 | chandle, &chandle); |
1da177e4 LT |
1243 | |
1244 | /* | |
1245 | * If this scope is exhausted then move our way back up. | |
1246 | */ | |
1247 | if (ACPI_FAILURE(status)) { | |
1248 | level--; | |
1249 | chandle = phandle; | |
1250 | acpi_get_parent(phandle, &phandle); | |
1251 | if (parent->parent) | |
1252 | parent = parent->parent; | |
1253 | continue; | |
1254 | } | |
1255 | ||
1256 | status = acpi_get_type(chandle, &type); | |
1257 | if (ACPI_FAILURE(status)) | |
1258 | continue; | |
1259 | ||
1260 | /* | |
1261 | * If this is a scope object then parse it (depth-first). | |
1262 | */ | |
1263 | if (type == ACPI_TYPE_LOCAL_SCOPE) { | |
1264 | level++; | |
1265 | phandle = chandle; | |
1266 | chandle = NULL; | |
1267 | continue; | |
1268 | } | |
1269 | ||
1270 | /* | |
1271 | * We're only interested in objects that we consider 'devices'. | |
1272 | */ | |
1273 | switch (type) { | |
1274 | case ACPI_TYPE_DEVICE: | |
1275 | type = ACPI_BUS_TYPE_DEVICE; | |
1276 | break; | |
1277 | case ACPI_TYPE_PROCESSOR: | |
1278 | type = ACPI_BUS_TYPE_PROCESSOR; | |
1279 | break; | |
1280 | case ACPI_TYPE_THERMAL: | |
1281 | type = ACPI_BUS_TYPE_THERMAL; | |
1282 | break; | |
1283 | case ACPI_TYPE_POWER: | |
1284 | type = ACPI_BUS_TYPE_POWER; | |
1285 | break; | |
1286 | default: | |
1287 | continue; | |
1288 | } | |
1289 | ||
3fb02738 RS |
1290 | if (ops->acpi_op_add) |
1291 | status = acpi_add_single_object(&child, parent, | |
4be44fcd LB |
1292 | chandle, type); |
1293 | else | |
3fb02738 RS |
1294 | status = acpi_bus_get_device(chandle, &child); |
1295 | ||
4be44fcd LB |
1296 | if (ACPI_FAILURE(status)) |
1297 | continue; | |
3fb02738 RS |
1298 | |
1299 | if (ops->acpi_op_start) { | |
1300 | status = acpi_start_single_object(child); | |
1301 | if (ACPI_FAILURE(status)) | |
1302 | continue; | |
1303 | } | |
1da177e4 LT |
1304 | |
1305 | /* | |
1306 | * If the device is present, enabled, and functioning then | |
1307 | * parse its scope (depth-first). Note that we need to | |
1308 | * represent absent devices to facilitate PnP notifications | |
1309 | * -- but only the subtree head (not all of its children, | |
1310 | * which will be enumerated when the parent is inserted). | |
1311 | * | |
1312 | * TBD: Need notifications and other detection mechanisms | |
4be44fcd | 1313 | * in place before we can fully implement this. |
1da177e4 LT |
1314 | */ |
1315 | if (child->status.present) { | |
1316 | status = acpi_get_next_object(ACPI_TYPE_ANY, chandle, | |
1317 | NULL, NULL); | |
1318 | if (ACPI_SUCCESS(status)) { | |
1319 | level++; | |
1320 | phandle = chandle; | |
1321 | chandle = NULL; | |
1322 | parent = child; | |
1323 | } | |
1324 | } | |
1325 | } | |
1326 | ||
d550d98d | 1327 | return 0; |
1da177e4 | 1328 | } |
1da177e4 | 1329 | |
3fb02738 | 1330 | int |
4be44fcd LB |
1331 | acpi_bus_add(struct acpi_device **child, |
1332 | struct acpi_device *parent, acpi_handle handle, int type) | |
3fb02738 RS |
1333 | { |
1334 | int result; | |
1335 | struct acpi_bus_ops ops; | |
1336 | ||
3fb02738 RS |
1337 | |
1338 | result = acpi_add_single_object(child, parent, handle, type); | |
1339 | if (!result) { | |
1340 | memset(&ops, 0, sizeof(ops)); | |
1341 | ops.acpi_op_add = 1; | |
1342 | result = acpi_bus_scan(*child, &ops); | |
1343 | } | |
d550d98d | 1344 | return result; |
3fb02738 | 1345 | } |
4be44fcd | 1346 | |
3fb02738 RS |
1347 | EXPORT_SYMBOL(acpi_bus_add); |
1348 | ||
4be44fcd | 1349 | int acpi_bus_start(struct acpi_device *device) |
3fb02738 RS |
1350 | { |
1351 | int result; | |
1352 | struct acpi_bus_ops ops; | |
1353 | ||
3fb02738 RS |
1354 | |
1355 | if (!device) | |
d550d98d | 1356 | return -EINVAL; |
3fb02738 RS |
1357 | |
1358 | result = acpi_start_single_object(device); | |
1359 | if (!result) { | |
1360 | memset(&ops, 0, sizeof(ops)); | |
1361 | ops.acpi_op_start = 1; | |
1362 | result = acpi_bus_scan(device, &ops); | |
1363 | } | |
d550d98d | 1364 | return result; |
3fb02738 | 1365 | } |
4be44fcd | 1366 | |
3fb02738 | 1367 | EXPORT_SYMBOL(acpi_bus_start); |
1da177e4 | 1368 | |
ceaba663 | 1369 | int acpi_bus_trim(struct acpi_device *start, int rmdevice) |
1da177e4 | 1370 | { |
4be44fcd LB |
1371 | acpi_status status; |
1372 | struct acpi_device *parent, *child; | |
1373 | acpi_handle phandle, chandle; | |
1374 | acpi_object_type type; | |
1375 | u32 level = 1; | |
1376 | int err = 0; | |
1377 | ||
1378 | parent = start; | |
1da177e4 LT |
1379 | phandle = start->handle; |
1380 | child = chandle = NULL; | |
1381 | ||
1382 | while ((level > 0) && parent && (!err)) { | |
1383 | status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, | |
4be44fcd | 1384 | chandle, &chandle); |
1da177e4 LT |
1385 | |
1386 | /* | |
1387 | * If this scope is exhausted then move our way back up. | |
1388 | */ | |
1389 | if (ACPI_FAILURE(status)) { | |
1390 | level--; | |
1391 | chandle = phandle; | |
1392 | acpi_get_parent(phandle, &phandle); | |
1393 | child = parent; | |
1394 | parent = parent->parent; | |
1395 | ||
1396 | if (level == 0) | |
1397 | err = acpi_bus_remove(child, rmdevice); | |
1398 | else | |
1399 | err = acpi_bus_remove(child, 1); | |
1400 | ||
1401 | continue; | |
1402 | } | |
1403 | ||
1404 | status = acpi_get_type(chandle, &type); | |
1405 | if (ACPI_FAILURE(status)) { | |
1406 | continue; | |
1407 | } | |
1408 | /* | |
1409 | * If there is a device corresponding to chandle then | |
1410 | * parse it (depth-first). | |
1411 | */ | |
1412 | if (acpi_bus_get_device(chandle, &child) == 0) { | |
1413 | level++; | |
1414 | phandle = chandle; | |
1415 | chandle = NULL; | |
1416 | parent = child; | |
1417 | } | |
1418 | continue; | |
1419 | } | |
1420 | return err; | |
1421 | } | |
ceaba663 KA |
1422 | EXPORT_SYMBOL_GPL(acpi_bus_trim); |
1423 | ||
1da177e4 | 1424 | |
4be44fcd | 1425 | static int acpi_bus_scan_fixed(struct acpi_device *root) |
1da177e4 | 1426 | { |
4be44fcd LB |
1427 | int result = 0; |
1428 | struct acpi_device *device = NULL; | |
1da177e4 | 1429 | |
1da177e4 LT |
1430 | |
1431 | if (!root) | |
d550d98d | 1432 | return -ENODEV; |
1da177e4 LT |
1433 | |
1434 | /* | |
1435 | * Enumerate all fixed-feature devices. | |
1436 | */ | |
3fb02738 RS |
1437 | if (acpi_fadt.pwr_button == 0) { |
1438 | result = acpi_add_single_object(&device, acpi_root, | |
4be44fcd LB |
1439 | NULL, |
1440 | ACPI_BUS_TYPE_POWER_BUTTON); | |
3fb02738 RS |
1441 | if (!result) |
1442 | result = acpi_start_single_object(device); | |
1443 | } | |
1da177e4 | 1444 | |
3fb02738 RS |
1445 | if (acpi_fadt.sleep_button == 0) { |
1446 | result = acpi_add_single_object(&device, acpi_root, | |
4be44fcd LB |
1447 | NULL, |
1448 | ACPI_BUS_TYPE_SLEEP_BUTTON); | |
3fb02738 RS |
1449 | if (!result) |
1450 | result = acpi_start_single_object(device); | |
1451 | } | |
1da177e4 | 1452 | |
d550d98d | 1453 | return result; |
1da177e4 LT |
1454 | } |
1455 | ||
1da177e4 LT |
1456 | static int __init acpi_scan_init(void) |
1457 | { | |
1458 | int result; | |
3fb02738 | 1459 | struct acpi_bus_ops ops; |
1da177e4 | 1460 | |
1da177e4 LT |
1461 | |
1462 | if (acpi_disabled) | |
d550d98d | 1463 | return 0; |
1da177e4 | 1464 | |
9b6d97b6 RD |
1465 | result = kset_register(&acpi_namespace_kset); |
1466 | if (result < 0) | |
1467 | printk(KERN_ERR PREFIX "kset_register error: %d\n", result); | |
1da177e4 | 1468 | |
5b327265 PM |
1469 | result = bus_register(&acpi_bus_type); |
1470 | if (result) { | |
1471 | /* We don't want to quit even if we failed to add suspend/resume */ | |
1472 | printk(KERN_ERR PREFIX "Could not register bus type\n"); | |
1473 | } | |
1474 | ||
1da177e4 LT |
1475 | /* |
1476 | * Create the root device in the bus's device tree | |
1477 | */ | |
3fb02738 | 1478 | result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT, |
4be44fcd | 1479 | ACPI_BUS_TYPE_SYSTEM); |
1da177e4 LT |
1480 | if (result) |
1481 | goto Done; | |
1482 | ||
3fb02738 | 1483 | result = acpi_start_single_object(acpi_root); |
5b327265 PM |
1484 | if (result) |
1485 | goto Done; | |
1486 | ||
1487 | acpi_root->dev.bus = &acpi_bus_type; | |
1488 | snprintf(acpi_root->dev.bus_id, BUS_ID_SIZE, "%s", acpi_bus_type.name); | |
1489 | result = device_register(&acpi_root->dev); | |
1490 | if (result) { | |
1491 | /* We don't want to quit even if we failed to add suspend/resume */ | |
1492 | printk(KERN_ERR PREFIX "Could not register device\n"); | |
1493 | } | |
3fb02738 | 1494 | |
1da177e4 LT |
1495 | /* |
1496 | * Enumerate devices in the ACPI namespace. | |
1497 | */ | |
1498 | result = acpi_bus_scan_fixed(acpi_root); | |
3fb02738 RS |
1499 | if (!result) { |
1500 | memset(&ops, 0, sizeof(ops)); | |
1501 | ops.acpi_op_add = 1; | |
1502 | ops.acpi_op_start = 1; | |
1503 | result = acpi_bus_scan(acpi_root, &ops); | |
1504 | } | |
1da177e4 LT |
1505 | |
1506 | if (result) | |
1507 | acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL); | |
1508 | ||
4be44fcd | 1509 | Done: |
d550d98d | 1510 | return result; |
1da177e4 LT |
1511 | } |
1512 | ||
1513 | subsys_initcall(acpi_scan_init); |