blob: 44225cb15f3a248fb842c6e3b3d3f188f47aa99d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * scan.c - support for transforming the ACPI namespace into individual objects
3 */
4
5#include <linux/module.h>
6#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09007#include <linux/slab.h>
Randy Dunlap9b6d97b2006-07-12 02:08:00 -04008#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/acpi.h>
Alok N Kataria74523c92008-06-13 12:54:24 -040010#include <linux/signal.h>
11#include <linux/kthread.h>
Darrick J. Wong222e82a2010-03-24 14:38:37 +010012#include <linux/dmi.h>
Lance Ortizd1efe3c2012-10-02 12:43:23 -060013#include <linux/nls.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
15#include <acpi/acpi_drivers.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
Bjorn Helgaase60cc7a2009-03-13 12:08:26 -060017#include "internal.h"
18
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#define _COMPONENT ACPI_BUS_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050020ACPI_MODULE_NAME("scan");
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#define STRUCT_TO_INT(s) (*((int*)&s))
Len Brown4be44fc2005-08-05 00:44:28 -040022extern struct acpi_device *acpi_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24#define ACPI_BUS_CLASS "system_bus"
Thomas Renninger29b71a12007-07-23 14:43:51 +020025#define ACPI_BUS_HID "LNXSYBUS"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#define ACPI_BUS_DEVICE_NAME "System Bus"
27
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +000028#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
29
Thomas Renninger620e1122010-10-01 10:54:00 +020030static const char *dummy_hid = "device";
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +020031
Linus Torvalds1da177e2005-04-16 15:20:36 -070032static LIST_HEAD(acpi_device_list);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +080033static LIST_HEAD(acpi_bus_id_list);
Rafael J. Wysockic511cc12013-01-27 21:17:29 +010034static DEFINE_MUTEX(acpi_scan_lock);
Rafael J. Wysockica589f92013-01-30 14:27:29 +010035static LIST_HEAD(acpi_scan_handlers_list);
Shaohua Li90905892009-04-07 10:24:29 +080036DEFINE_MUTEX(acpi_device_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037LIST_HEAD(acpi_wakeup_device_list);
38
Zhang Ruie49bd2dd2006-12-08 17:23:43 +080039struct acpi_device_bus_id{
Zhang Ruibb095852007-01-04 15:03:18 +080040 char bus_id[15];
Zhang Ruie49bd2dd2006-12-08 17:23:43 +080041 unsigned int instance_no;
42 struct list_head node;
43};
Thomas Renninger29b71a12007-07-23 14:43:51 +020044
Rafael J. Wysocki3757b942013-02-13 14:36:47 +010045void acpi_scan_lock_acquire(void)
46{
47 mutex_lock(&acpi_scan_lock);
48}
49EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
50
51void acpi_scan_lock_release(void)
52{
53 mutex_unlock(&acpi_scan_lock);
54}
55EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
56
Rafael J. Wysockica589f92013-01-30 14:27:29 +010057int acpi_scan_add_handler(struct acpi_scan_handler *handler)
58{
59 if (!handler || !handler->attach)
60 return -EINVAL;
61
62 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
63 return 0;
64}
65
Rafael J. Wysocki3f8055c2013-03-03 23:08:16 +010066int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
67 const char *hotplug_profile_name)
68{
69 int error;
70
71 error = acpi_scan_add_handler(handler);
72 if (error)
73 return error;
74
75 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
76 return 0;
77}
78
Thomas Renninger29b71a12007-07-23 14:43:51 +020079/*
80 * Creates hid/cid(s) string needed for modalias and uevent
81 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
82 * char *modalias: "acpi:IBM0001:ACPI0001"
83*/
Adrian Bunkb3e572d2007-08-14 23:22:35 +020084static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
85 int size)
86{
Thomas Renninger29b71a12007-07-23 14:43:51 +020087 int len;
Zhang Rui5c9fcb52008-03-20 16:40:32 +080088 int count;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -060089 struct acpi_hardware_id *id;
Thomas Renninger29b71a12007-07-23 14:43:51 +020090
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +020091 if (list_empty(&acpi_dev->pnp.ids))
92 return 0;
93
Zhang Rui5c9fcb52008-03-20 16:40:32 +080094 len = snprintf(modalias, size, "acpi:");
Thomas Renninger29b71a12007-07-23 14:43:51 +020095 size -= len;
96
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -060097 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
98 count = snprintf(&modalias[len], size, "%s:", id->id);
Zhang Rui5c9fcb52008-03-20 16:40:32 +080099 if (count < 0 || count >= size)
100 return -EINVAL;
101 len += count;
102 size -= count;
103 }
104
Thomas Renninger29b71a12007-07-23 14:43:51 +0200105 modalias[len] = '\0';
106 return len;
107}
108
109static ssize_t
110acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
111 struct acpi_device *acpi_dev = to_acpi_device(dev);
112 int len;
113
114 /* Device has no HID and no CID or string is >1024 */
115 len = create_modalias(acpi_dev, buf, 1024);
116 if (len <= 0)
117 return 0;
118 buf[len++] = '\n';
119 return len;
120}
121static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
122
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100123static int acpi_scan_hot_remove(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124{
Yinghai Lu5993c462013-01-11 22:40:41 +0000125 acpi_handle handle = device->handle;
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100126 acpi_handle not_used;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 struct acpi_object_list arg_list;
128 union acpi_object arg;
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100129 acpi_status status;
Toshi Kani882fd122013-03-13 19:29:26 +0000130 unsigned long long sta;
Rafael J. Wysockif058cdf2013-02-09 15:29:11 +0100131
Rafael J. Wysocki3757b942013-02-13 14:36:47 +0100132 /* If there is no handle, the device node has been unregistered. */
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100133 if (!handle) {
Rafael J. Wysocki3757b942013-02-13 14:36:47 +0100134 dev_dbg(&device->dev, "ACPI handle missing\n");
135 put_device(&device->dev);
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100136 return -EINVAL;
Rafael J. Wysocki3757b942013-02-13 14:36:47 +0100137 }
138
Zhang Rui26d46862008-04-29 02:35:48 -0400139 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Kay Sievers07944692008-10-30 01:18:59 +0100140 "Hot-removing device %s...\n", dev_name(&device->dev)));
Zhang Rui26d46862008-04-29 02:35:48 -0400141
Rafael J. Wysockibfee26d2013-01-26 00:27:44 +0100142 acpi_bus_trim(device);
Rafael J. Wysocki3757b942013-02-13 14:36:47 +0100143 /* Device node has been unregistered. */
144 put_device(&device->dev);
Toshi Kanib3c450c2012-10-26 13:38:57 +0200145 device = NULL;
146
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100147 if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &not_used))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 arg_list.count = 1;
149 arg_list.pointer = &arg;
150 arg.type = ACPI_TYPE_INTEGER;
151 arg.integer.value = 0;
152 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
153 }
154
155 arg_list.count = 1;
156 arg_list.pointer = &arg;
157 arg.type = ACPI_TYPE_INTEGER;
158 arg.integer.value = 1;
159
160 /*
161 * TBD: _EJD support.
162 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
Toshi Kanic4753e52012-05-23 20:25:20 -0600164 if (ACPI_FAILURE(status)) {
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100165 if (status == AE_NOT_FOUND) {
166 return -ENODEV;
167 } else {
Toshi Kani882fd122013-03-13 19:29:26 +0000168 acpi_handle_warn(handle, "Eject failed (0x%x)\n",
169 status);
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100170 return -EIO;
171 }
172 }
Rafael J. Wysockif058cdf2013-02-09 15:29:11 +0100173
Toshi Kani882fd122013-03-13 19:29:26 +0000174 /*
175 * Verify if eject was indeed successful. If not, log an error
176 * message. No need to call _OST since _EJ0 call was made OK.
177 */
178 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
179 if (ACPI_FAILURE(status)) {
180 acpi_handle_warn(handle,
181 "Status check after eject failed (0x%x)\n", status);
182 } else if (sta & ACPI_STA_DEVICE_ENABLED) {
183 acpi_handle_warn(handle,
184 "Eject incomplete - status 0x%llx\n", sta);
185 }
186
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100187 return 0;
188}
Rafael J. Wysockif058cdf2013-02-09 15:29:11 +0100189
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100190static void acpi_bus_device_eject(void *context)
191{
192 acpi_handle handle = context;
193 struct acpi_device *device = NULL;
194 struct acpi_scan_handler *handler;
195 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
196
197 mutex_lock(&acpi_scan_lock);
198
199 acpi_bus_get_device(handle, &device);
200 if (!device)
201 goto err_out;
202
203 handler = device->handler;
204 if (!handler || !handler->hotplug.enabled) {
205 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
206 goto err_out;
207 }
208 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST,
209 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
210 if (handler->hotplug.mode == AHM_CONTAINER) {
211 device->flags.eject_pending = true;
212 kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
213 } else {
214 int error;
215
216 get_device(&device->dev);
217 error = acpi_scan_hot_remove(device);
218 if (error)
219 goto err_out;
Toshi Kanic4753e52012-05-23 20:25:20 -0600220 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
Rafael J. Wysocki3757b942013-02-13 14:36:47 +0100222 out:
Rafael J. Wysockif058cdf2013-02-09 15:29:11 +0100223 mutex_unlock(&acpi_scan_lock);
Zhang Ruic8d72a52009-06-22 11:31:16 +0800224 return;
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100225
226 err_out:
227 acpi_evaluate_hotplug_ost(handle, ACPI_NOTIFY_EJECT_REQUEST, ost_code,
228 NULL);
229 goto out;
230}
231
232static void acpi_scan_bus_device_check(acpi_handle handle, u32 ost_source)
233{
234 struct acpi_device *device = NULL;
235 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
236 int error;
237
238 mutex_lock(&acpi_scan_lock);
239
240 acpi_bus_get_device(handle, &device);
241 if (device) {
242 dev_warn(&device->dev, "Attempt to re-insert\n");
243 goto out;
244 }
245 acpi_evaluate_hotplug_ost(handle, ost_source,
246 ACPI_OST_SC_INSERT_IN_PROGRESS, NULL);
247 error = acpi_bus_scan(handle);
248 if (error) {
249 acpi_handle_warn(handle, "Namespace scan failure\n");
250 goto out;
251 }
252 error = acpi_bus_get_device(handle, &device);
253 if (error) {
254 acpi_handle_warn(handle, "Missing device node object\n");
255 goto out;
256 }
257 ost_code = ACPI_OST_SC_SUCCESS;
258 if (device->handler && device->handler->hotplug.mode == AHM_CONTAINER)
259 kobject_uevent(&device->dev.kobj, KOBJ_ONLINE);
260
261 out:
262 acpi_evaluate_hotplug_ost(handle, ost_source, ost_code, NULL);
263 mutex_unlock(&acpi_scan_lock);
264}
265
266static void acpi_scan_bus_check(void *context)
267{
268 acpi_scan_bus_device_check((acpi_handle)context,
269 ACPI_NOTIFY_BUS_CHECK);
270}
271
272static void acpi_scan_device_check(void *context)
273{
274 acpi_scan_bus_device_check((acpi_handle)context,
275 ACPI_NOTIFY_DEVICE_CHECK);
276}
277
Toshi Kani2cbb14f2013-03-05 22:33:31 +0000278static void acpi_hotplug_unsupported(acpi_handle handle, u32 type)
279{
280 u32 ost_status;
281
282 switch (type) {
283 case ACPI_NOTIFY_BUS_CHECK:
284 acpi_handle_debug(handle,
285 "ACPI_NOTIFY_BUS_CHECK event: unsupported\n");
286 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
287 break;
288 case ACPI_NOTIFY_DEVICE_CHECK:
289 acpi_handle_debug(handle,
290 "ACPI_NOTIFY_DEVICE_CHECK event: unsupported\n");
291 ost_status = ACPI_OST_SC_INSERT_NOT_SUPPORTED;
292 break;
293 case ACPI_NOTIFY_EJECT_REQUEST:
294 acpi_handle_debug(handle,
295 "ACPI_NOTIFY_EJECT_REQUEST event: unsupported\n");
296 ost_status = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
297 break;
298 default:
299 /* non-hotplug event; possibly handled by other handler */
300 return;
301 }
302
303 acpi_evaluate_hotplug_ost(handle, type, ost_status, NULL);
304}
305
306static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data)
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100307{
308 acpi_osd_exec_callback callback;
Toshi Kani2cbb14f2013-03-05 22:33:31 +0000309 struct acpi_scan_handler *handler = data;
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100310 acpi_status status;
311
Toshi Kani2cbb14f2013-03-05 22:33:31 +0000312 if (!handler->hotplug.enabled)
313 return acpi_hotplug_unsupported(handle, type);
314
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100315 switch (type) {
316 case ACPI_NOTIFY_BUS_CHECK:
317 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
318 callback = acpi_scan_bus_check;
319 break;
320 case ACPI_NOTIFY_DEVICE_CHECK:
321 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
322 callback = acpi_scan_device_check;
323 break;
324 case ACPI_NOTIFY_EJECT_REQUEST:
325 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
326 callback = acpi_bus_device_eject;
327 break;
328 default:
329 /* non-hotplug event; possibly handled by other handler */
330 return;
331 }
332 status = acpi_os_hotplug_execute(callback, handle);
333 if (ACPI_FAILURE(status))
334 acpi_evaluate_hotplug_ost(handle, type,
335 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
336 NULL);
337}
338
339/**
340 * acpi_bus_hot_remove_device: hot-remove a device and its children
341 * @context: struct acpi_eject_event pointer (freed in this func)
342 *
343 * Hot-remove a device and its children. This function frees up the
344 * memory space passed by arg context, so that the caller may call
345 * this function asynchronously through acpi_os_hotplug_execute().
346 */
347void acpi_bus_hot_remove_device(void *context)
348{
349 struct acpi_eject_event *ej_event = context;
350 struct acpi_device *device = ej_event->device;
351 acpi_handle handle = device->handle;
352 int error;
353
354 mutex_lock(&acpi_scan_lock);
355
356 error = acpi_scan_hot_remove(device);
357 if (error && handle)
358 acpi_evaluate_hotplug_ost(handle, ej_event->event,
359 ACPI_OST_SC_NON_SPECIFIC_FAILURE,
360 NULL);
361
362 mutex_unlock(&acpi_scan_lock);
363 kfree(context);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364}
Toshi Kani61622ac2012-11-01 14:42:12 +0000365EXPORT_SYMBOL(acpi_bus_hot_remove_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
Rafael J. Wysocki836aedb2013-01-24 12:49:59 +0100367static ssize_t real_power_state_show(struct device *dev,
368 struct device_attribute *attr, char *buf)
369{
370 struct acpi_device *adev = to_acpi_device(dev);
371 int state;
372 int ret;
373
374 ret = acpi_device_get_power(adev, &state);
375 if (ret)
376 return ret;
377
378 return sprintf(buf, "%s\n", acpi_power_state_string(state));
379}
380
381static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
382
383static ssize_t power_state_show(struct device *dev,
384 struct device_attribute *attr, char *buf)
385{
386 struct acpi_device *adev = to_acpi_device(dev);
387
388 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
389}
390
391static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
392
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393static ssize_t
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800394acpi_eject_store(struct device *d, struct device_attribute *attr,
395 const char *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396{
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800397 struct acpi_device *acpi_device = to_acpi_device(d);
Toshi Kanic4753e52012-05-23 20:25:20 -0600398 struct acpi_eject_event *ej_event;
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100399 acpi_object_type not_used;
400 acpi_status status;
401 u32 ost_source;
402 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100404 if (!count || buf[0] != '1')
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100407 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled)
408 && !acpi_device->driver)
409 return -ENODEV;
410
411 status = acpi_get_type(acpi_device->handle, &not_used);
412 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable)
413 return -ENODEV;
414
415 mutex_lock(&acpi_scan_lock);
416
417 if (acpi_device->flags.eject_pending) {
418 /* ACPI eject notification event. */
419 ost_source = ACPI_NOTIFY_EJECT_REQUEST;
420 acpi_device->flags.eject_pending = 0;
421 } else {
422 /* Eject initiated by user space. */
423 ost_source = ACPI_OST_EC_OSPM_EJECT;
424 }
Toshi Kanic4753e52012-05-23 20:25:20 -0600425 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
426 if (!ej_event) {
427 ret = -ENOMEM;
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100428 goto err_out;
Toshi Kanic4753e52012-05-23 20:25:20 -0600429 }
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100430 acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
431 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
Yinghai Lu5993c462013-01-11 22:40:41 +0000432 ej_event->device = acpi_device;
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100433 ej_event->event = ost_source;
434 get_device(&acpi_device->dev);
Rafael J. Wysocki3757b942013-02-13 14:36:47 +0100435 status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
436 if (ACPI_FAILURE(status)) {
437 put_device(&acpi_device->dev);
438 kfree(ej_event);
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100439 ret = status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN;
440 goto err_out;
Rafael J. Wysocki3757b942013-02-13 14:36:47 +0100441 }
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100442 ret = count;
443
444 out:
445 mutex_unlock(&acpi_scan_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 return ret;
Rafael J. Wysockia33ec392013-03-03 23:05:29 +0100447
448 err_out:
449 acpi_evaluate_hotplug_ost(acpi_device->handle, ost_source,
450 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL);
451 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452}
453
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800454static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800456static ssize_t
457acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
458 struct acpi_device *acpi_dev = to_acpi_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
Bjorn Helgaasea8d82f2009-09-21 13:35:09 -0600460 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800461}
462static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
463
Lv Zheng923d4a42012-10-30 14:43:26 +0100464static ssize_t acpi_device_uid_show(struct device *dev,
465 struct device_attribute *attr, char *buf)
466{
467 struct acpi_device *acpi_dev = to_acpi_device(dev);
468
469 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
470}
471static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
472
473static ssize_t acpi_device_adr_show(struct device *dev,
474 struct device_attribute *attr, char *buf)
475{
476 struct acpi_device *acpi_dev = to_acpi_device(dev);
477
478 return sprintf(buf, "0x%08x\n",
479 (unsigned int)(acpi_dev->pnp.bus_address));
480}
481static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
482
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800483static ssize_t
484acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
485 struct acpi_device *acpi_dev = to_acpi_device(dev);
486 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
487 int result;
488
489 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
Alex Chiang0c526d92009-05-14 08:31:37 -0600490 if (result)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800491 goto end;
492
493 result = sprintf(buf, "%s\n", (char*)path.pointer);
494 kfree(path.pointer);
Alex Chiang0c526d92009-05-14 08:31:37 -0600495end:
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800496 return result;
497}
498static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
499
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600500/* sysfs file that shows description text from the ACPI _STR method */
501static ssize_t description_show(struct device *dev,
502 struct device_attribute *attr,
503 char *buf) {
504 struct acpi_device *acpi_dev = to_acpi_device(dev);
505 int result;
506
507 if (acpi_dev->pnp.str_obj == NULL)
508 return 0;
509
510 /*
511 * The _STR object contains a Unicode identifier for a device.
512 * We need to convert to utf-8 so it can be displayed.
513 */
514 result = utf16s_to_utf8s(
515 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
516 acpi_dev->pnp.str_obj->buffer.length,
517 UTF16_LITTLE_ENDIAN, buf,
518 PAGE_SIZE);
519
520 buf[result++] = '\n';
521
522 return result;
523}
524static DEVICE_ATTR(description, 0444, description_show, NULL);
525
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100526static ssize_t
527acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
528 char *buf) {
529 struct acpi_device *acpi_dev = to_acpi_device(dev);
530
531 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
532}
533static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
534
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800535static int acpi_device_setup_files(struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536{
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600537 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800538 acpi_status status;
539 acpi_handle temp;
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100540 unsigned long long sun;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800541 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800543 /*
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800544 * Devices gotten from FADT don't have a "path" attribute
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800545 */
Alex Chiang0c526d92009-05-14 08:31:37 -0600546 if (dev->handle) {
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800547 result = device_create_file(&dev->dev, &dev_attr_path);
Alex Chiang0c526d92009-05-14 08:31:37 -0600548 if (result)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800549 goto end;
550 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200552 if (!list_empty(&dev->pnp.ids)) {
553 result = device_create_file(&dev->dev, &dev_attr_hid);
554 if (result)
555 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200557 result = device_create_file(&dev->dev, &dev_attr_modalias);
558 if (result)
559 goto end;
560 }
Thomas Renninger29b71a12007-07-23 14:43:51 +0200561
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600562 /*
563 * If device has _STR, 'description' file is created
564 */
565 status = acpi_get_handle(dev->handle, "_STR", &temp);
566 if (ACPI_SUCCESS(status)) {
567 status = acpi_evaluate_object(dev->handle, "_STR",
568 NULL, &buffer);
569 if (ACPI_FAILURE(status))
570 buffer.pointer = NULL;
571 dev->pnp.str_obj = buffer.pointer;
572 result = device_create_file(&dev->dev, &dev_attr_description);
573 if (result)
574 goto end;
575 }
576
Toshi Kanid4e1a692013-03-04 21:30:41 +0000577 if (dev->pnp.type.bus_address)
Lv Zheng923d4a42012-10-30 14:43:26 +0100578 result = device_create_file(&dev->dev, &dev_attr_adr);
579 if (dev->pnp.unique_id)
580 result = device_create_file(&dev->dev, &dev_attr_uid);
581
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100582 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
583 if (ACPI_SUCCESS(status)) {
584 dev->pnp.sun = (unsigned long)sun;
585 result = device_create_file(&dev->dev, &dev_attr_sun);
586 if (result)
587 goto end;
588 } else {
589 dev->pnp.sun = (unsigned long)-1;
590 }
591
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800592 /*
593 * If device has _EJ0, 'eject' file is created that is used to trigger
594 * hot-removal function from userland.
595 */
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800596 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
Rafael J. Wysocki836aedb2013-01-24 12:49:59 +0100597 if (ACPI_SUCCESS(status)) {
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800598 result = device_create_file(&dev->dev, &dev_attr_eject);
Rafael J. Wysocki836aedb2013-01-24 12:49:59 +0100599 if (result)
600 return result;
601 }
602
603 if (dev->flags.power_manageable) {
604 result = device_create_file(&dev->dev, &dev_attr_power_state);
605 if (result)
606 return result;
607
608 if (dev->power.flags.power_resources)
609 result = device_create_file(&dev->dev,
610 &dev_attr_real_power_state);
611 }
612
Alex Chiang0c526d92009-05-14 08:31:37 -0600613end:
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800614 return result;
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800615}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800617static void acpi_device_remove_files(struct acpi_device *dev)
618{
619 acpi_status status;
620 acpi_handle temp;
621
Rafael J. Wysocki836aedb2013-01-24 12:49:59 +0100622 if (dev->flags.power_manageable) {
623 device_remove_file(&dev->dev, &dev_attr_power_state);
624 if (dev->power.flags.power_resources)
625 device_remove_file(&dev->dev,
626 &dev_attr_real_power_state);
627 }
628
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800629 /*
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600630 * If device has _STR, remove 'description' file
631 */
632 status = acpi_get_handle(dev->handle, "_STR", &temp);
633 if (ACPI_SUCCESS(status)) {
634 kfree(dev->pnp.str_obj);
635 device_remove_file(&dev->dev, &dev_attr_description);
636 }
637 /*
638 * If device has _EJ0, remove 'eject' file.
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800639 */
640 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
641 if (ACPI_SUCCESS(status))
642 device_remove_file(&dev->dev, &dev_attr_eject);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800643
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100644 status = acpi_get_handle(dev->handle, "_SUN", &temp);
645 if (ACPI_SUCCESS(status))
646 device_remove_file(&dev->dev, &dev_attr_sun);
647
Lv Zheng923d4a42012-10-30 14:43:26 +0100648 if (dev->pnp.unique_id)
649 device_remove_file(&dev->dev, &dev_attr_uid);
Toshi Kanid4e1a692013-03-04 21:30:41 +0000650 if (dev->pnp.type.bus_address)
Lv Zheng923d4a42012-10-30 14:43:26 +0100651 device_remove_file(&dev->dev, &dev_attr_adr);
Bjorn Helgaas1131b932009-09-21 13:35:29 -0600652 device_remove_file(&dev->dev, &dev_attr_modalias);
653 device_remove_file(&dev->dev, &dev_attr_hid);
Alex Chiang0c526d92009-05-14 08:31:37 -0600654 if (dev->handle)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800655 device_remove_file(&dev->dev, &dev_attr_path);
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800656}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657/* --------------------------------------------------------------------------
Zhang Rui9e89dde2006-12-07 20:56:16 +0800658 ACPI Bus operations
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 -------------------------------------------------------------------------- */
Thomas Renninger29b71a12007-07-23 14:43:51 +0200660
Mika Westerbergcf761af2012-10-31 22:44:41 +0100661static const struct acpi_device_id *__acpi_match_device(
662 struct acpi_device *device, const struct acpi_device_id *ids)
Thomas Renninger29b71a12007-07-23 14:43:51 +0200663{
664 const struct acpi_device_id *id;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600665 struct acpi_hardware_id *hwid;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200666
Zhao Yakui39a0ad82008-08-11 13:40:22 +0800667 /*
668 * If the device is not present, it is unnecessary to load device
669 * driver for it.
670 */
671 if (!device->status.present)
Mika Westerbergcf761af2012-10-31 22:44:41 +0100672 return NULL;
Zhao Yakui39a0ad82008-08-11 13:40:22 +0800673
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600674 for (id = ids; id->id[0]; id++)
675 list_for_each_entry(hwid, &device->pnp.ids, list)
676 if (!strcmp((char *) id->id, hwid->id))
Mika Westerbergcf761af2012-10-31 22:44:41 +0100677 return id;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200678
Mika Westerbergcf761af2012-10-31 22:44:41 +0100679 return NULL;
680}
681
682/**
683 * acpi_match_device - Match a struct device against a given list of ACPI IDs
684 * @ids: Array of struct acpi_device_id object to match against.
685 * @dev: The device structure to match.
686 *
687 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
688 * object for that handle and use that object to match against a given list of
689 * device IDs.
690 *
691 * Return a pointer to the first matching ID on success or %NULL on failure.
692 */
693const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
694 const struct device *dev)
695{
696 struct acpi_device *adev;
Rafael J. Wysocki0613e1f2013-01-31 20:54:05 +0100697 acpi_handle handle = ACPI_HANDLE(dev);
Mika Westerbergcf761af2012-10-31 22:44:41 +0100698
Rafael J. Wysocki0613e1f2013-01-31 20:54:05 +0100699 if (!ids || !handle || acpi_bus_get_device(handle, &adev))
Mika Westerbergcf761af2012-10-31 22:44:41 +0100700 return NULL;
701
702 return __acpi_match_device(adev, ids);
703}
704EXPORT_SYMBOL_GPL(acpi_match_device);
705
706int acpi_match_device_ids(struct acpi_device *device,
707 const struct acpi_device_id *ids)
708{
709 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200710}
711EXPORT_SYMBOL(acpi_match_device_ids);
712
Rafael J. Wysocki0b224522013-01-17 14:11:06 +0100713static void acpi_free_power_resources_lists(struct acpi_device *device)
714{
715 int i;
716
Rafael J. Wysocki993cbe52013-01-17 14:11:06 +0100717 if (device->wakeup.flags.valid)
718 acpi_power_resources_list_free(&device->wakeup.resources);
719
Rafael J. Wysocki0b224522013-01-17 14:11:06 +0100720 if (!device->flags.power_manageable)
721 return;
722
723 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
724 struct acpi_device_power_state *ps = &device->power.states[i];
725 acpi_power_resources_list_free(&ps->resources);
726 }
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600727}
728
Patrick Mochel1890a972006-12-07 20:56:31 +0800729static void acpi_device_release(struct device *dev)
730{
731 struct acpi_device *acpi_dev = to_acpi_device(dev);
732
Toshi Kanic0af4172013-03-04 21:30:42 +0000733 acpi_free_pnp_ids(&acpi_dev->pnp);
Rafael J. Wysocki0b224522013-01-17 14:11:06 +0100734 acpi_free_power_resources_lists(acpi_dev);
Patrick Mochel1890a972006-12-07 20:56:31 +0800735 kfree(acpi_dev);
736}
737
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800738static int acpi_bus_match(struct device *dev, struct device_driver *drv)
739{
740 struct acpi_device *acpi_dev = to_acpi_device(dev);
741 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
742
Rafael J. Wysocki209d3b12012-12-21 00:36:48 +0100743 return acpi_dev->flags.match_driver
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +0100744 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800745}
746
Kay Sievers7eff2e72007-08-14 15:15:12 +0200747static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800748{
749 struct acpi_device *acpi_dev = to_acpi_device(dev);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200750 int len;
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800751
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200752 if (list_empty(&acpi_dev->pnp.ids))
753 return 0;
754
Kay Sievers7eff2e72007-08-14 15:15:12 +0200755 if (add_uevent_var(env, "MODALIAS="))
756 return -ENOMEM;
757 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
758 sizeof(env->buf) - env->buflen);
759 if (len >= (sizeof(env->buf) - env->buflen))
760 return -ENOMEM;
761 env->buflen += len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 return 0;
763}
764
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000765static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
766{
767 struct acpi_device *device = data;
768
769 device->driver->ops.notify(device, event);
770}
771
772static acpi_status acpi_device_notify_fixed(void *data)
773{
774 struct acpi_device *device = data;
775
Bjorn Helgaas53de5352009-08-31 22:32:20 +0000776 /* Fixed hardware devices have no handles */
777 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000778 return AE_OK;
779}
780
781static int acpi_device_install_notify_handler(struct acpi_device *device)
782{
783 acpi_status status;
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000784
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000785 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000786 status =
787 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
788 acpi_device_notify_fixed,
789 device);
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000790 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000791 status =
792 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
793 acpi_device_notify_fixed,
794 device);
795 else
796 status = acpi_install_notify_handler(device->handle,
797 ACPI_DEVICE_NOTIFY,
798 acpi_device_notify,
799 device);
800
801 if (ACPI_FAILURE(status))
802 return -EINVAL;
803 return 0;
804}
805
806static void acpi_device_remove_notify_handler(struct acpi_device *device)
807{
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000808 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000809 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
810 acpi_device_notify_fixed);
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000811 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000812 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
813 acpi_device_notify_fixed);
814 else
815 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
816 acpi_device_notify);
817}
818
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800819static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800820static int acpi_device_probe(struct device * dev)
Zhang Rui9e89dde2006-12-07 20:56:16 +0800821{
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800822 struct acpi_device *acpi_dev = to_acpi_device(dev);
823 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
824 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800826 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
827 if (!ret) {
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000828 if (acpi_drv->ops.notify) {
829 ret = acpi_device_install_notify_handler(acpi_dev);
830 if (ret) {
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000831 if (acpi_drv->ops.remove)
Rafael J. Wysocki51fac832013-01-24 00:24:48 +0100832 acpi_drv->ops.remove(acpi_dev);
Toshi Kani5f27ee82013-02-07 21:19:13 +0000833 acpi_dev->driver = NULL;
834 acpi_dev->driver_data = NULL;
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000835 return ret;
836 }
837 }
838
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800839 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
840 "Found driver [%s] for device [%s]\n",
841 acpi_drv->name, acpi_dev->pnp.bus_id));
842 get_device(dev);
Zhang Rui9e89dde2006-12-07 20:56:16 +0800843 }
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800844 return ret;
845}
846
847static int acpi_device_remove(struct device * dev)
848{
849 struct acpi_device *acpi_dev = to_acpi_device(dev);
850 struct acpi_driver *acpi_drv = acpi_dev->driver;
851
852 if (acpi_drv) {
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000853 if (acpi_drv->ops.notify)
854 acpi_device_remove_notify_handler(acpi_dev);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800855 if (acpi_drv->ops.remove)
Rafael J. Wysocki51fac832013-01-24 00:24:48 +0100856 acpi_drv->ops.remove(acpi_dev);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800857 }
858 acpi_dev->driver = NULL;
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700859 acpi_dev->driver_data = NULL;
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800860
861 put_device(dev);
Zhang Rui9e89dde2006-12-07 20:56:16 +0800862 return 0;
863}
864
David Brownell55955aa2007-05-08 00:28:35 -0700865struct bus_type acpi_bus_type = {
Zhang Rui9e89dde2006-12-07 20:56:16 +0800866 .name = "acpi",
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800867 .match = acpi_bus_match,
868 .probe = acpi_device_probe,
869 .remove = acpi_device_remove,
870 .uevent = acpi_device_uevent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871};
872
Rafael J. Wysockicf860be2013-01-24 12:49:49 +0100873int acpi_device_add(struct acpi_device *device,
874 void (*release)(struct device *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875{
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800876 int result;
877 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
878 int found = 0;
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +0000879
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100880 if (device->handle) {
881 acpi_status status;
882
883 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
884 device);
885 if (ACPI_FAILURE(status)) {
886 acpi_handle_err(device->handle,
887 "Unable to attach device data\n");
888 return -ENODEV;
889 }
890 }
891
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 /*
893 * Linkage
894 * -------
895 * Link this device to its parent and siblings.
896 */
897 INIT_LIST_HEAD(&device->children);
898 INIT_LIST_HEAD(&device->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 INIT_LIST_HEAD(&device->wakeup_list);
Lan Tianyu1033f902012-08-17 14:44:09 +0800900 INIT_LIST_HEAD(&device->physical_node_list);
901 mutex_init(&device->physical_node_lock);
Rafael J. Wysockibc9b6402013-01-17 14:11:05 +0100902 INIT_LIST_HEAD(&device->power_dependent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800904 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
905 if (!new_bus_id) {
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100906 pr_err(PREFIX "Memory allocation error\n");
907 result = -ENOMEM;
908 goto err_detach;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800909 }
910
Shaohua Li90905892009-04-07 10:24:29 +0800911 mutex_lock(&acpi_device_lock);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800912 /*
913 * Find suitable bus_id and instance number in acpi_bus_id_list
914 * If failed, create one and link it into acpi_bus_id_list
915 */
916 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
Bjorn Helgaas1131b932009-09-21 13:35:29 -0600917 if (!strcmp(acpi_device_bus_id->bus_id,
918 acpi_device_hid(device))) {
919 acpi_device_bus_id->instance_no++;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800920 found = 1;
921 kfree(new_bus_id);
922 break;
923 }
924 }
Alex Chiang0c526d92009-05-14 08:31:37 -0600925 if (!found) {
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800926 acpi_device_bus_id = new_bus_id;
Bjorn Helgaas1131b932009-09-21 13:35:29 -0600927 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800928 acpi_device_bus_id->instance_no = 0;
929 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
930 }
Kay Sievers07944692008-10-30 01:18:59 +0100931 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800932
Len Brown33b57152008-12-15 22:09:26 -0500933 if (device->parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 list_add_tail(&device->node, &device->parent->children);
Len Brown33b57152008-12-15 22:09:26 -0500935
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 if (device->wakeup.flags.valid)
937 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
Shaohua Li90905892009-04-07 10:24:29 +0800938 mutex_unlock(&acpi_device_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939
Patrick Mochel1890a972006-12-07 20:56:31 +0800940 if (device->parent)
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +0000941 device->dev.parent = &device->parent->dev;
Patrick Mochel1890a972006-12-07 20:56:31 +0800942 device->dev.bus = &acpi_bus_type;
Rafael J. Wysocki82c7d5e2013-01-17 14:11:05 +0100943 device->dev.release = release;
Rafael J. Wysockicf860be2013-01-24 12:49:49 +0100944 result = device_add(&device->dev);
Alex Chiang0c526d92009-05-14 08:31:37 -0600945 if (result) {
Alex Chiang8b12b922009-05-14 08:31:32 -0600946 dev_err(&device->dev, "Error registering device\n");
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100947 goto err;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800948 }
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800949
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800950 result = acpi_device_setup_files(device);
Alex Chiang0c526d92009-05-14 08:31:37 -0600951 if (result)
Kay Sievers07944692008-10-30 01:18:59 +0100952 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
953 dev_name(&device->dev));
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800954
Li Shaohua96333572006-12-07 20:56:46 +0800955 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800956 return 0;
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100957
958 err:
Shaohua Li90905892009-04-07 10:24:29 +0800959 mutex_lock(&acpi_device_lock);
Len Brown33b57152008-12-15 22:09:26 -0500960 if (device->parent)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800961 list_del(&device->node);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800962 list_del(&device->wakeup_list);
Shaohua Li90905892009-04-07 10:24:29 +0800963 mutex_unlock(&acpi_device_lock);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100964
965 err_detach:
966 acpi_detach_data(device->handle, acpi_bus_data_handler);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800967 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968}
969
Rafael J. Wysockib17b5372013-01-15 13:23:44 +0100970static void acpi_device_unregister(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971{
Shaohua Li90905892009-04-07 10:24:29 +0800972 mutex_lock(&acpi_device_lock);
Len Brown33b57152008-12-15 22:09:26 -0500973 if (device->parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 list_del(&device->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975
976 list_del(&device->wakeup_list);
Shaohua Li90905892009-04-07 10:24:29 +0800977 mutex_unlock(&acpi_device_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978
979 acpi_detach_data(device->handle, acpi_bus_data_handler);
Patrick Mochel1890a972006-12-07 20:56:31 +0800980
Rafael J. Wysockibc9b6402013-01-17 14:11:05 +0100981 acpi_power_add_remove_device(device, false);
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800982 acpi_device_remove_files(device);
Rafael J. Wysockib1c0f992013-01-24 12:50:09 +0100983 if (device->remove)
984 device->remove(device);
985
Rafael J. Wysockicf860be2013-01-24 12:49:49 +0100986 device_del(&device->dev);
Rafael J. Wysockibc9b6402013-01-17 14:11:05 +0100987 /*
Rafael J. Wysocki0aa120a2013-02-09 15:29:20 +0100988 * Transition the device to D3cold to drop the reference counts of all
989 * power resources the device depends on and turn off the ones that have
990 * no more references.
Rafael J. Wysockibc9b6402013-01-17 14:11:05 +0100991 */
Rafael J. Wysocki0aa120a2013-02-09 15:29:20 +0100992 acpi_device_set_power(device, ACPI_STATE_D3_COLD);
Rafael J. Wysocki3757b942013-02-13 14:36:47 +0100993 device->handle = NULL;
Rafael J. Wysockicf860be2013-01-24 12:49:49 +0100994 put_device(&device->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995}
996
Zhang Rui9e89dde2006-12-07 20:56:16 +0800997/* --------------------------------------------------------------------------
998 Driver Management
999 -------------------------------------------------------------------------- */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000/**
Randy Dunlapd758a8f2006-01-06 01:31:00 -05001001 * acpi_bus_driver_init - add a device to a driver
1002 * @device: the device to add and initialize
1003 * @driver: driver for the device
1004 *
Alex Chiang0c526d92009-05-14 08:31:37 -06001005 * Used to initialize a device via its device driver. Called whenever a
Patrick Mochel1890a972006-12-07 20:56:31 +08001006 * driver is bound to a device. Invokes the driver's add() ops.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 */
1008static int
Len Brown4be44fc2005-08-05 00:44:28 -04001009acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010{
Len Brown4be44fc2005-08-05 00:44:28 -04001011 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 if (!device || !driver)
Patrick Mocheld550d982006-06-27 00:41:40 -04001014 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015
1016 if (!driver->ops.add)
Patrick Mocheld550d982006-06-27 00:41:40 -04001017 return -ENOSYS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018
1019 result = driver->ops.add(device);
1020 if (result) {
1021 device->driver = NULL;
Pavel Machekdb89b4f2008-09-22 14:37:34 -07001022 device->driver_data = NULL;
Patrick Mocheld550d982006-06-27 00:41:40 -04001023 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 }
1025
1026 device->driver = driver;
1027
1028 /*
1029 * TBD - Configuration Management: Assign resources to device based
1030 * upon possible configuration and currently allocated resources.
1031 */
1032
Len Brown4be44fc2005-08-05 00:44:28 -04001033 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1034 "Driver successfully bound to device\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -04001035 return 0;
Rajesh Shah3fb02732005-04-28 00:25:52 -07001036}
1037
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038/**
Randy Dunlapd758a8f2006-01-06 01:31:00 -05001039 * acpi_bus_register_driver - register a driver with the ACPI bus
1040 * @driver: driver being registered
1041 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 * Registers a driver with the ACPI bus. Searches the namespace for all
Bjorn Helgaas9d9f7492006-03-28 17:04:00 -05001043 * devices that match the driver's criteria and binds. Returns zero for
1044 * success or a negative error status for failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 */
Len Brown4be44fc2005-08-05 00:44:28 -04001046int acpi_bus_register_driver(struct acpi_driver *driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047{
Patrick Mochel1890a972006-12-07 20:56:31 +08001048 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049
1050 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -04001051 return -ENODEV;
Patrick Mochel1890a972006-12-07 20:56:31 +08001052 driver->drv.name = driver->name;
1053 driver->drv.bus = &acpi_bus_type;
1054 driver->drv.owner = driver->owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055
Patrick Mochel1890a972006-12-07 20:56:31 +08001056 ret = driver_register(&driver->drv);
1057 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059
Len Brown4be44fc2005-08-05 00:44:28 -04001060EXPORT_SYMBOL(acpi_bus_register_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061
1062/**
Randy Dunlapd758a8f2006-01-06 01:31:00 -05001063 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
1064 * @driver: driver to unregister
1065 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 * Unregisters a driver with the ACPI bus. Searches the namespace for all
1067 * devices that match the driver's criteria and unbinds.
1068 */
Bjorn Helgaas06ea8e082006-04-27 05:25:00 -04001069void acpi_bus_unregister_driver(struct acpi_driver *driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070{
Patrick Mochel1890a972006-12-07 20:56:31 +08001071 driver_unregister(&driver->drv);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072}
Len Brown4be44fc2005-08-05 00:44:28 -04001073
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074EXPORT_SYMBOL(acpi_bus_unregister_driver);
1075
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076/* --------------------------------------------------------------------------
1077 Device Enumeration
1078 -------------------------------------------------------------------------- */
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001079static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
1080{
Rafael J. Wysocki456de892013-01-31 20:57:40 +01001081 struct acpi_device *device = NULL;
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001082 acpi_status status;
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001083
1084 /*
1085 * Fixed hardware devices do not appear in the namespace and do not
1086 * have handles, but we fabricate acpi_devices for them, so we have
1087 * to deal with them specially.
1088 */
Rafael J. Wysocki456de892013-01-31 20:57:40 +01001089 if (!handle)
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001090 return acpi_root;
1091
1092 do {
1093 status = acpi_get_parent(handle, &handle);
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001094 if (ACPI_FAILURE(status))
Rafael J. Wysocki456de892013-01-31 20:57:40 +01001095 return status == AE_NULL_ENTRY ? NULL : acpi_root;
1096 } while (acpi_bus_get_device(handle, &device));
1097 return device;
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001098}
1099
Len Brownc8f7a62c2006-07-09 17:22:28 -04001100acpi_status
1101acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
1102{
1103 acpi_status status;
1104 acpi_handle tmp;
1105 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
1106 union acpi_object *obj;
1107
1108 status = acpi_get_handle(handle, "_EJD", &tmp);
1109 if (ACPI_FAILURE(status))
1110 return status;
1111
1112 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
1113 if (ACPI_SUCCESS(status)) {
1114 obj = buffer.pointer;
Holger Macht3b5fee52008-02-14 13:40:34 +01001115 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
1116 ejd);
Len Brownc8f7a62c2006-07-09 17:22:28 -04001117 kfree(buffer.pointer);
1118 }
1119 return status;
1120}
1121EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
1122
Bob Moore8e4319c2009-06-29 13:43:27 +08001123void acpi_bus_data_handler(acpi_handle handle, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124{
1125
1126 /* TBD */
1127
1128 return;
1129}
1130
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001131static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
1132 struct acpi_device_wakeup *wakeup)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133{
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001134 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1135 union acpi_object *package = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 union acpi_object *element = NULL;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001137 acpi_status status;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001138 int err = -ENODATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001140 if (!wakeup)
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001141 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142
Rafael J. Wysocki993cbe52013-01-17 14:11:06 +01001143 INIT_LIST_HEAD(&wakeup->resources);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001145 /* _PRW */
1146 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
1147 if (ACPI_FAILURE(status)) {
1148 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001149 return err;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001150 }
1151
1152 package = (union acpi_object *)buffer.pointer;
1153
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001154 if (!package || package->package.count < 2)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001155 goto out;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001156
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 element = &(package->package.elements[0]);
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001158 if (!element)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001159 goto out;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001160
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 if (element->type == ACPI_TYPE_PACKAGE) {
1162 if ((element->package.count < 2) ||
1163 (element->package.elements[0].type !=
1164 ACPI_TYPE_LOCAL_REFERENCE)
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001165 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001166 goto out;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001167
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001168 wakeup->gpe_device =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 element->package.elements[0].reference.handle;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001170 wakeup->gpe_number =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 (u32) element->package.elements[1].integer.value;
1172 } else if (element->type == ACPI_TYPE_INTEGER) {
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001173 wakeup->gpe_device = NULL;
1174 wakeup->gpe_number = element->integer.value;
1175 } else {
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001176 goto out;
1177 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178
1179 element = &(package->package.elements[1]);
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001180 if (element->type != ACPI_TYPE_INTEGER)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001181 goto out;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001182
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001183 wakeup->sleep_state = element->integer.value;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001185 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1186 if (err)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001187 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188
Rafael J. Wysocki0596a522013-01-17 14:11:07 +01001189 if (!list_empty(&wakeup->resources)) {
1190 int sleep_state;
1191
Rafael J. Wysockib5d667e2013-02-23 23:15:21 +01001192 err = acpi_power_wakeup_list_init(&wakeup->resources,
1193 &sleep_state);
1194 if (err) {
1195 acpi_handle_warn(handle, "Retrieving current states "
1196 "of wakeup power resources failed\n");
1197 acpi_power_resources_list_free(&wakeup->resources);
1198 goto out;
1199 }
Rafael J. Wysocki0596a522013-01-17 14:11:07 +01001200 if (sleep_state < wakeup->sleep_state) {
1201 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1202 "(S%d) by S%d from power resources\n",
1203 (int)wakeup->sleep_state, sleep_state);
1204 wakeup->sleep_state = sleep_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 }
Lin Mingbba63a22010-12-13 13:39:17 +08001207 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
Rafael J. Wysocki98746472010-07-08 00:43:36 +02001208
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001209 out:
1210 kfree(buffer.pointer);
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001211 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212}
1213
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001214static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215{
Thomas Renninger29b71a12007-07-23 14:43:51 +02001216 struct acpi_device_id button_device_ids[] = {
Thomas Renninger29b71a12007-07-23 14:43:51 +02001217 {"PNP0C0C", 0},
Zhang Ruib7e38302012-12-04 23:23:16 +01001218 {"PNP0C0D", 0},
Thomas Renninger29b71a12007-07-23 14:43:51 +02001219 {"PNP0C0E", 0},
1220 {"", 0},
1221 };
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001222 acpi_status status;
1223 acpi_event_status event_status;
1224
Rafael J. Wysockib67ea762010-02-17 23:44:09 +01001225 device->wakeup.flags.notifier_present = 0;
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001226
1227 /* Power button, Lid switch always enable wakeup */
1228 if (!acpi_match_device_ids(device, button_device_ids)) {
1229 device->wakeup.flags.run_wake = 1;
Zhang Ruib7e38302012-12-04 23:23:16 +01001230 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1231 /* Do not use Lid/sleep button for S5 wakeup */
1232 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1233 device->wakeup.sleep_state = ACPI_STATE_S4;
1234 }
Rafael J. Wysockif2b56bc2011-01-06 23:34:22 +01001235 device_set_wakeup_capable(&device->dev, true);
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001236 return;
1237 }
1238
Rafael J. Wysockie8e18c92010-07-08 00:42:51 +02001239 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1240 device->wakeup.gpe_number,
1241 &event_status);
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001242 if (status == AE_OK)
1243 device->wakeup.flags.run_wake =
1244 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1245}
1246
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001247static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001248{
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001249 acpi_handle temp;
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001250 acpi_status status = 0;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001251 int err;
Thomas Renninger29b71a12007-07-23 14:43:51 +02001252
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001253 /* Presence of _PRW indicates wake capable */
1254 status = acpi_get_handle(device->handle, "_PRW", &temp);
1255 if (ACPI_FAILURE(status))
1256 return;
1257
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001258 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1259 &device->wakeup);
1260 if (err) {
1261 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001262 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263 }
1264
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 device->wakeup.flags.valid = 1;
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +02001266 device->wakeup.prepare_count = 0;
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001267 acpi_bus_set_run_wake_flags(device);
Zhao Yakui729b2bd2008-03-19 13:26:54 +08001268 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1269 * system for the ACPI device with the _PRW object.
1270 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1271 * So it is necessary to call _DSW object first. Only when it is not
1272 * present will the _PSW object used.
1273 */
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001274 err = acpi_device_sleep_wake(device, 0, 0, 0);
1275 if (err)
Rafael J. Wysocki77e76602008-07-07 03:33:34 +02001276 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1277 "error in _DSW or _PSW evaluation\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278}
1279
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001280static void acpi_bus_init_power_state(struct acpi_device *device, int state)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281{
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001282 struct acpi_device_power_state *ps = &device->power.states[state];
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001283 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1284 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001285 acpi_handle handle;
1286 acpi_status status;
Zhang Rui9e89dde2006-12-07 20:56:16 +08001287
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001288 INIT_LIST_HEAD(&ps->resources);
1289
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001290 /* Evaluate "_PRx" to get referenced power resources */
1291 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1292 if (ACPI_SUCCESS(status)) {
1293 union acpi_object *package = buffer.pointer;
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001294
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001295 if (buffer.length && package
1296 && package->type == ACPI_TYPE_PACKAGE
1297 && package->package.count) {
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001298 int err = acpi_extract_power_resources(package, 0,
1299 &ps->resources);
1300 if (!err)
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001301 device->power.flags.power_resources = 1;
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001302 }
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001303 ACPI_FREE(buffer.pointer);
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001304 }
1305
1306 /* Evaluate "_PSx" to see if we can do explicit sets */
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001307 pathname[2] = 'S';
1308 status = acpi_get_handle(device->handle, pathname, &handle);
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001309 if (ACPI_SUCCESS(status))
1310 ps->flags.explicit_set = 1;
1311
1312 /*
1313 * State is valid if there are means to put the device into it.
1314 * D3hot is only valid if _PR3 present.
1315 */
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001316 if (!list_empty(&ps->resources)
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001317 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1318 ps->flags.valid = 1;
1319 ps->flags.os_accessible = 1;
1320 }
1321
1322 ps->power = -1; /* Unknown - driver assigned */
1323 ps->latency = -1; /* Unknown - driver assigned */
1324}
1325
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001326static void acpi_bus_get_power_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327{
Rafael J. Wysocki8bc50532013-01-17 14:11:07 +01001328 acpi_status status;
1329 acpi_handle handle;
1330 u32 i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001332 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1333 status = acpi_get_handle(device->handle, "_PS0", &handle);
1334 if (ACPI_FAILURE(status)) {
1335 status = acpi_get_handle(device->handle, "_PR0", &handle);
1336 if (ACPI_FAILURE(status))
1337 return;
1338 }
1339
1340 device->flags.power_manageable = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341
1342 /*
Zhang Rui9e89dde2006-12-07 20:56:16 +08001343 * Power Management Flags
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 */
Zhang Rui9e89dde2006-12-07 20:56:16 +08001345 status = acpi_get_handle(device->handle, "_PSC", &handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346 if (ACPI_SUCCESS(status))
Zhang Rui9e89dde2006-12-07 20:56:16 +08001347 device->power.flags.explicit_get = 1;
1348 status = acpi_get_handle(device->handle, "_IRC", &handle);
1349 if (ACPI_SUCCESS(status))
1350 device->power.flags.inrush_current = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351
1352 /*
Zhang Rui9e89dde2006-12-07 20:56:16 +08001353 * Enumerate supported power management states
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 */
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001355 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1356 acpi_bus_init_power_state(device, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357
Rafael J. Wysocki0b224522013-01-17 14:11:06 +01001358 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359
Zhang Rui9e89dde2006-12-07 20:56:16 +08001360 /* Set defaults for D0 and D3 states (always valid) */
1361 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1362 device->power.states[ACPI_STATE_D0].power = 100;
1363 device->power.states[ACPI_STATE_D3].flags.valid = 1;
1364 device->power.states[ACPI_STATE_D3].power = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365
Rafael J. Wysocki5c7dd712012-05-18 00:39:35 +02001366 /* Set D3cold's explicit_set flag if _PS3 exists. */
1367 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1368 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1369
Aaron Lu1399dfc2012-11-21 23:33:40 +01001370 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1371 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1372 device->power.flags.power_resources)
1373 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1374
Rafael J. Wysockib3785492013-02-01 23:43:02 +01001375 if (acpi_bus_init_power(device)) {
1376 acpi_free_power_resources_lists(device);
1377 device->flags.power_manageable = 0;
1378 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379}
1380
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001381static void acpi_bus_get_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382{
Len Brown4be44fc2005-08-05 00:44:28 -04001383 acpi_status status = AE_OK;
1384 acpi_handle temp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 /* Presence of _STA indicates 'dynamic_status' */
1387 status = acpi_get_handle(device->handle, "_STA", &temp);
1388 if (ACPI_SUCCESS(status))
1389 device->flags.dynamic_status = 1;
1390
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 /* Presence of _RMV indicates 'removable' */
1392 status = acpi_get_handle(device->handle, "_RMV", &temp);
1393 if (ACPI_SUCCESS(status))
1394 device->flags.removable = 1;
1395
1396 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1397 status = acpi_get_handle(device->handle, "_EJD", &temp);
1398 if (ACPI_SUCCESS(status))
1399 device->flags.ejectable = 1;
1400 else {
1401 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1402 if (ACPI_SUCCESS(status))
1403 device->flags.ejectable = 1;
1404 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405}
1406
Bjorn Helgaasc7bcb4e2009-09-21 19:29:25 +00001407static void acpi_device_get_busid(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408{
Len Brown4be44fc2005-08-05 00:44:28 -04001409 char bus_id[5] = { '?', 0 };
1410 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1411 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412
1413 /*
1414 * Bus ID
1415 * ------
1416 * The device's Bus ID is simply the object name.
1417 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1418 */
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001419 if (ACPI_IS_ROOT_DEVICE(device)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 strcpy(device->pnp.bus_id, "ACPI");
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001421 return;
1422 }
1423
1424 switch (device->device_type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 case ACPI_BUS_TYPE_POWER_BUTTON:
1426 strcpy(device->pnp.bus_id, "PWRF");
1427 break;
1428 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1429 strcpy(device->pnp.bus_id, "SLPF");
1430 break;
1431 default:
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +00001432 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 /* Clean up trailing underscores (if any) */
1434 for (i = 3; i > 1; i--) {
1435 if (bus_id[i] == '_')
1436 bus_id[i] = '\0';
1437 else
1438 break;
1439 }
1440 strcpy(device->pnp.bus_id, bus_id);
1441 break;
1442 }
1443}
1444
Zhang Rui54735262007-01-11 02:09:09 -05001445/*
Toshi Kanid4e1a692013-03-04 21:30:41 +00001446 * acpi_bay_match - see if an acpi object is an ejectable driver bay
Zhang Rui54735262007-01-11 02:09:09 -05001447 *
1448 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1449 * then we can safely call it an ejectable drive bay
1450 */
Toshi Kanid4e1a692013-03-04 21:30:41 +00001451static int acpi_bay_match(acpi_handle handle)
1452{
Zhang Rui54735262007-01-11 02:09:09 -05001453 acpi_status status;
Zhang Rui54735262007-01-11 02:09:09 -05001454 acpi_handle tmp;
1455 acpi_handle phandle;
1456
Zhang Rui54735262007-01-11 02:09:09 -05001457 status = acpi_get_handle(handle, "_EJ0", &tmp);
1458 if (ACPI_FAILURE(status))
1459 return -ENODEV;
1460
1461 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1462 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1463 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1464 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1465 return 0;
1466
1467 if (acpi_get_parent(handle, &phandle))
1468 return -ENODEV;
1469
1470 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1471 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1472 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1473 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1474 return 0;
1475
1476 return -ENODEV;
1477}
1478
Frank Seidel3620f2f2007-12-07 13:20:34 +01001479/*
Toshi Kanid4e1a692013-03-04 21:30:41 +00001480 * acpi_dock_match - see if an acpi object has a _DCK method
Frank Seidel3620f2f2007-12-07 13:20:34 +01001481 */
Toshi Kanid4e1a692013-03-04 21:30:41 +00001482static int acpi_dock_match(acpi_handle handle)
Frank Seidel3620f2f2007-12-07 13:20:34 +01001483{
1484 acpi_handle tmp;
Toshi Kanid4e1a692013-03-04 21:30:41 +00001485 return acpi_get_handle(handle, "_DCK", &tmp);
Frank Seidel3620f2f2007-12-07 13:20:34 +01001486}
1487
Thomas Renninger620e1122010-10-01 10:54:00 +02001488const char *acpi_device_hid(struct acpi_device *device)
Bob Moore15b8dd52009-06-29 13:39:29 +08001489{
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001490 struct acpi_hardware_id *hid;
Bob Moore15b8dd52009-06-29 13:39:29 +08001491
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +02001492 if (list_empty(&device->pnp.ids))
1493 return dummy_hid;
1494
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001495 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1496 return hid->id;
1497}
1498EXPORT_SYMBOL(acpi_device_hid);
Bob Moore15b8dd52009-06-29 13:39:29 +08001499
Toshi Kanid4e1a692013-03-04 21:30:41 +00001500static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001501{
1502 struct acpi_hardware_id *id;
Bob Moore15b8dd52009-06-29 13:39:29 +08001503
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001504 id = kmalloc(sizeof(*id), GFP_KERNEL);
1505 if (!id)
1506 return;
Bob Moore15b8dd52009-06-29 13:39:29 +08001507
Thomas Meyer581de592011-08-06 11:32:56 +02001508 id->id = kstrdup(dev_id, GFP_KERNEL);
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001509 if (!id->id) {
1510 kfree(id);
1511 return;
Bob Moore15b8dd52009-06-29 13:39:29 +08001512 }
1513
Toshi Kanid4e1a692013-03-04 21:30:41 +00001514 list_add_tail(&id->list, &pnp->ids);
1515 pnp->type.hardware_id = 1;
Bob Moore15b8dd52009-06-29 13:39:29 +08001516}
1517
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001518/*
1519 * Old IBM workstations have a DSDT bug wherein the SMBus object
1520 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1521 * prefix. Work around this.
1522 */
Toshi Kanid4e1a692013-03-04 21:30:41 +00001523static int acpi_ibm_smbus_match(acpi_handle handle)
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001524{
1525 acpi_handle h_dummy;
1526 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1527 int result;
1528
1529 if (!dmi_name_in_vendors("IBM"))
1530 return -ENODEV;
1531
1532 /* Look for SMBS object */
Toshi Kanid4e1a692013-03-04 21:30:41 +00001533 result = acpi_get_name(handle, ACPI_SINGLE_NAME, &path);
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001534 if (result)
1535 return result;
1536
1537 if (strcmp("SMBS", path.pointer)) {
1538 result = -ENODEV;
1539 goto out;
1540 }
1541
1542 /* Does it have the necessary (but misnamed) methods? */
1543 result = -ENODEV;
Toshi Kanid4e1a692013-03-04 21:30:41 +00001544 if (ACPI_SUCCESS(acpi_get_handle(handle, "SBI", &h_dummy)) &&
1545 ACPI_SUCCESS(acpi_get_handle(handle, "SBR", &h_dummy)) &&
1546 ACPI_SUCCESS(acpi_get_handle(handle, "SBW", &h_dummy)))
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001547 result = 0;
1548out:
1549 kfree(path.pointer);
1550 return result;
1551}
1552
Toshi Kanic0af4172013-03-04 21:30:42 +00001553static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
1554 int device_type)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555{
Len Brown4be44fc2005-08-05 00:44:28 -04001556 acpi_status status;
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001557 struct acpi_device_info *info;
Lv Zheng78e25fe2012-10-31 02:25:24 +00001558 struct acpi_pnp_device_id_list *cid_list;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001559 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560
Toshi Kanic0af4172013-03-04 21:30:42 +00001561 switch (device_type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562 case ACPI_BUS_TYPE_DEVICE:
Toshi Kanic0af4172013-03-04 21:30:42 +00001563 if (handle == ACPI_ROOT_OBJECT) {
1564 acpi_add_id(pnp, ACPI_SYSTEM_HID);
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001565 break;
1566 }
1567
Toshi Kanic0af4172013-03-04 21:30:42 +00001568 status = acpi_get_object_info(handle, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 if (ACPI_FAILURE(status)) {
Toshi Kanic0af4172013-03-04 21:30:42 +00001570 pr_err(PREFIX "%s: Error reading device info\n",
1571 __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572 return;
1573 }
1574
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575 if (info->valid & ACPI_VALID_HID)
Toshi Kanic0af4172013-03-04 21:30:42 +00001576 acpi_add_id(pnp, info->hardware_id.string);
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001577 if (info->valid & ACPI_VALID_CID) {
Bob Moore15b8dd52009-06-29 13:39:29 +08001578 cid_list = &info->compatible_id_list;
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001579 for (i = 0; i < cid_list->count; i++)
Toshi Kanic0af4172013-03-04 21:30:42 +00001580 acpi_add_id(pnp, cid_list->ids[i].string);
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001581 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001582 if (info->valid & ACPI_VALID_ADR) {
Toshi Kanic0af4172013-03-04 21:30:42 +00001583 pnp->bus_address = info->address;
1584 pnp->type.bus_address = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585 }
Lv Zhengccf78042012-10-30 14:41:07 +01001586 if (info->valid & ACPI_VALID_UID)
Toshi Kanic0af4172013-03-04 21:30:42 +00001587 pnp->unique_id = kstrdup(info->unique_id.string,
Lv Zhengccf78042012-10-30 14:41:07 +01001588 GFP_KERNEL);
Zhang Ruiae843332006-12-07 20:57:10 +08001589
Bjorn Helgaasa83893ae2009-10-02 11:03:12 -04001590 kfree(info);
1591
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001592 /*
1593 * Some devices don't reliably have _HIDs & _CIDs, so add
1594 * synthetic HIDs to make sure drivers can find them.
1595 */
Toshi Kanic0af4172013-03-04 21:30:42 +00001596 if (acpi_is_video_device(handle))
1597 acpi_add_id(pnp, ACPI_VIDEO_HID);
1598 else if (ACPI_SUCCESS(acpi_bay_match(handle)))
1599 acpi_add_id(pnp, ACPI_BAY_HID);
1600 else if (ACPI_SUCCESS(acpi_dock_match(handle)))
1601 acpi_add_id(pnp, ACPI_DOCK_HID);
1602 else if (!acpi_ibm_smbus_match(handle))
1603 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
1604 else if (list_empty(&pnp->ids) && handle == ACPI_ROOT_OBJECT) {
1605 acpi_add_id(pnp, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1606 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
1607 strcpy(pnp->device_class, ACPI_BUS_CLASS);
Bjorn Helgaasb7b30de2010-03-24 10:44:33 -06001608 }
Zhang Rui54735262007-01-11 02:09:09 -05001609
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 break;
1611 case ACPI_BUS_TYPE_POWER:
Toshi Kanic0af4172013-03-04 21:30:42 +00001612 acpi_add_id(pnp, ACPI_POWER_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001613 break;
1614 case ACPI_BUS_TYPE_PROCESSOR:
Toshi Kanic0af4172013-03-04 21:30:42 +00001615 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001616 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617 case ACPI_BUS_TYPE_THERMAL:
Toshi Kanic0af4172013-03-04 21:30:42 +00001618 acpi_add_id(pnp, ACPI_THERMAL_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619 break;
1620 case ACPI_BUS_TYPE_POWER_BUTTON:
Toshi Kanic0af4172013-03-04 21:30:42 +00001621 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622 break;
1623 case ACPI_BUS_TYPE_SLEEP_BUTTON:
Toshi Kanic0af4172013-03-04 21:30:42 +00001624 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001625 break;
1626 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627}
1628
Toshi Kanic0af4172013-03-04 21:30:42 +00001629void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
1630{
1631 struct acpi_hardware_id *id, *tmp;
1632
1633 list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
1634 kfree(id->id);
1635 kfree(id);
1636 }
1637 kfree(pnp->unique_id);
1638}
1639
Rafael J. Wysocki82c7d5e2013-01-17 14:11:05 +01001640void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1641 int type, unsigned long long sta)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001642{
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001643 INIT_LIST_HEAD(&device->pnp.ids);
1644 device->device_type = type;
1645 device->handle = handle;
1646 device->parent = acpi_bus_get_parent(handle);
1647 STRUCT_TO_INT(device->status) = sta;
1648 acpi_device_get_busid(device);
Toshi Kanic0af4172013-03-04 21:30:42 +00001649 acpi_set_pnp_ids(handle, &device->pnp, type);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001650 acpi_bus_get_flags(device);
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001651 device->flags.match_driver = false;
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001652 device_initialize(&device->dev);
1653 dev_set_uevent_suppress(&device->dev, true);
1654}
Bjorn Helgaasbc3b0772009-09-21 19:29:20 +00001655
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001656void acpi_device_add_finalize(struct acpi_device *device)
1657{
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001658 device->flags.match_driver = true;
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001659 dev_set_uevent_suppress(&device->dev, false);
1660 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001661}
1662
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001663static int acpi_add_single_object(struct acpi_device **child,
1664 acpi_handle handle, int type,
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001665 unsigned long long sta)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001666{
Bjorn Helgaas77c24882009-09-21 19:29:30 +00001667 int result;
1668 struct acpi_device *device;
Bjorn Helgaas29aaefa2009-09-21 19:28:54 +00001669 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670
Burman Yan36bcbec2006-12-19 12:56:11 -08001671 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672 if (!device) {
Len Brown64684632006-06-26 23:41:38 -04001673 printk(KERN_ERR PREFIX "Memory allocation error\n");
Patrick Mocheld550d982006-06-27 00:41:40 -04001674 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001677 acpi_init_device_object(device, handle, type, sta);
1678 acpi_bus_get_power_flags(device);
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001679 acpi_bus_get_wakeup_device_flags(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001681 result = acpi_device_add(device, acpi_device_release);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001682 if (result) {
Hugh Dickins718fb0d2009-08-06 23:18:12 +00001683 acpi_device_release(&device->dev);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001684 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685 }
1686
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001687 acpi_power_add_remove_device(device, true);
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001688 acpi_device_add_finalize(device);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001689 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1690 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1691 dev_name(&device->dev), (char *) buffer.pointer,
1692 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1693 kfree(buffer.pointer);
1694 *child = device;
1695 return 0;
Rafael J. Wysockibf325f92010-11-25 00:10:44 +01001696}
1697
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001698static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1699 unsigned long long *sta)
1700{
1701 acpi_status status;
1702 acpi_object_type acpi_type;
1703
1704 status = acpi_get_type(handle, &acpi_type);
1705 if (ACPI_FAILURE(status))
1706 return -ENODEV;
1707
1708 switch (acpi_type) {
1709 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1710 case ACPI_TYPE_DEVICE:
1711 *type = ACPI_BUS_TYPE_DEVICE;
1712 status = acpi_bus_get_status_handle(handle, sta);
1713 if (ACPI_FAILURE(status))
1714 return -ENODEV;
1715 break;
1716 case ACPI_TYPE_PROCESSOR:
1717 *type = ACPI_BUS_TYPE_PROCESSOR;
1718 status = acpi_bus_get_status_handle(handle, sta);
1719 if (ACPI_FAILURE(status))
1720 return -ENODEV;
1721 break;
1722 case ACPI_TYPE_THERMAL:
1723 *type = ACPI_BUS_TYPE_THERMAL;
1724 *sta = ACPI_STA_DEFAULT;
1725 break;
1726 case ACPI_TYPE_POWER:
1727 *type = ACPI_BUS_TYPE_POWER;
1728 *sta = ACPI_STA_DEFAULT;
1729 break;
1730 default:
1731 return -ENODEV;
1732 }
1733
1734 return 0;
1735}
1736
Rafael J. Wysocki4b59cc12013-03-03 23:06:21 +01001737static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
1738 char *idstr,
1739 const struct acpi_device_id **matchid)
1740{
1741 const struct acpi_device_id *devid;
1742
1743 for (devid = handler->ids; devid->id[0]; devid++)
1744 if (!strcmp((char *)devid->id, idstr)) {
1745 if (matchid)
1746 *matchid = devid;
1747
1748 return true;
1749 }
1750
1751 return false;
1752}
1753
Toshi Kani6b772e8f2013-03-04 21:30:43 +00001754static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr,
1755 const struct acpi_device_id **matchid)
1756{
1757 struct acpi_scan_handler *handler;
1758
1759 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
1760 if (acpi_scan_handler_matching(handler, idstr, matchid))
1761 return handler;
1762
1763 return NULL;
1764}
1765
Rafael J. Wysocki3f8055c2013-03-03 23:08:16 +01001766void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
1767{
Rafael J. Wysocki3f8055c2013-03-03 23:08:16 +01001768 if (!!hotplug->enabled == !!val)
1769 return;
1770
1771 mutex_lock(&acpi_scan_lock);
1772
1773 hotplug->enabled = val;
Rafael J. Wysocki3f8055c2013-03-03 23:08:16 +01001774
1775 mutex_unlock(&acpi_scan_lock);
1776}
1777
Toshi Kani6b772e8f2013-03-04 21:30:43 +00001778static void acpi_scan_init_hotplug(acpi_handle handle, int type)
Rafael J. Wysockic5698072013-03-03 23:05:14 +01001779{
Toshi Kani6b772e8f2013-03-04 21:30:43 +00001780 struct acpi_device_pnp pnp = {};
1781 struct acpi_hardware_id *hwid;
Rafael J. Wysockic5698072013-03-03 23:05:14 +01001782 struct acpi_scan_handler *handler;
1783
Toshi Kani6b772e8f2013-03-04 21:30:43 +00001784 INIT_LIST_HEAD(&pnp.ids);
1785 acpi_set_pnp_ids(handle, &pnp, type);
Rafael J. Wysockic5698072013-03-03 23:05:14 +01001786
Toshi Kani6b772e8f2013-03-04 21:30:43 +00001787 if (!pnp.type.hardware_id)
Catalin Marinas7a26b532013-05-15 16:49:35 +00001788 goto out;
Rafael J. Wysockia33ec392013-03-03 23:05:29 +01001789
Rafael J. Wysockia33ec392013-03-03 23:05:29 +01001790 /*
1791 * This relies on the fact that acpi_install_notify_handler() will not
1792 * install the same notify handler routine twice for the same handle.
1793 */
Toshi Kani6b772e8f2013-03-04 21:30:43 +00001794 list_for_each_entry(hwid, &pnp.ids, list) {
1795 handler = acpi_scan_match_handler(hwid->id, NULL);
1796 if (handler) {
Toshi Kani2cbb14f2013-03-05 22:33:31 +00001797 acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
1798 acpi_hotplug_notify_cb, handler);
Toshi Kani6b772e8f2013-03-04 21:30:43 +00001799 break;
1800 }
1801 }
1802
Catalin Marinas7a26b532013-05-15 16:49:35 +00001803out:
Toshi Kani6b772e8f2013-03-04 21:30:43 +00001804 acpi_free_pnp_ids(&pnp);
Rafael J. Wysockia33ec392013-03-03 23:05:29 +01001805}
1806
Rafael J. Wysockie3863092012-12-21 00:36:47 +01001807static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1808 void *not_used, void **return_value)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809{
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001810 struct acpi_device *device = NULL;
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001811 int type;
1812 unsigned long long sta;
Bjorn Helgaase3b87f82009-09-21 19:30:11 +00001813 acpi_status status;
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001814 int result;
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001815
Rafael J. Wysocki4002bf32012-12-21 00:36:44 +01001816 acpi_bus_get_device(handle, &device);
1817 if (device)
1818 goto out;
1819
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001820 result = acpi_bus_type_and_status(handle, &type, &sta);
1821 if (result)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001822 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823
Rafael J. Wysocki82c7d5e2013-01-17 14:11:05 +01001824 if (type == ACPI_BUS_TYPE_POWER) {
1825 acpi_add_power_resource(handle);
1826 return AE_OK;
1827 }
1828
Toshi Kani6b772e8f2013-03-04 21:30:43 +00001829 acpi_scan_init_hotplug(handle, type);
Rafael J. Wysockia33ec392013-03-03 23:05:29 +01001830
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001831 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001832 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
Rafael J. Wysocki86e4e202011-01-06 23:40:00 +01001833 struct acpi_device_wakeup wakeup;
1834 acpi_handle temp;
1835
1836 status = acpi_get_handle(handle, "_PRW", &temp);
Rafael J. Wysocki993cbe52013-01-17 14:11:06 +01001837 if (ACPI_SUCCESS(status)) {
Rafael J. Wysocki86e4e202011-01-06 23:40:00 +01001838 acpi_bus_extract_wakeup_device_power_package(handle,
1839 &wakeup);
Rafael J. Wysocki993cbe52013-01-17 14:11:06 +01001840 acpi_power_resources_list_free(&wakeup.resources);
1841 }
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001842 return AE_CTRL_DEPTH;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001843 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001845 acpi_add_single_object(&device, handle, type, sta);
Bjorn Helgaase3b87f82009-09-21 19:30:11 +00001846 if (!device)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001847 return AE_CTRL_DEPTH;
1848
Rafael J. Wysocki4002bf32012-12-21 00:36:44 +01001849 out:
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001850 if (!*return_value)
1851 *return_value = device;
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001852
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001853 return AE_OK;
1854}
1855
Rafael J. Wysocki87b85b32013-02-06 13:05:22 +01001856static int acpi_scan_attach_handler(struct acpi_device *device)
1857{
1858 struct acpi_hardware_id *hwid;
1859 int ret = 0;
1860
1861 list_for_each_entry(hwid, &device->pnp.ids, list) {
Rafael J. Wysockic5698072013-03-03 23:05:14 +01001862 const struct acpi_device_id *devid;
1863 struct acpi_scan_handler *handler;
Rafael J. Wysocki87b85b32013-02-06 13:05:22 +01001864
Rafael J. Wysockic5698072013-03-03 23:05:14 +01001865 handler = acpi_scan_match_handler(hwid->id, &devid);
1866 if (handler) {
1867 ret = handler->attach(device, devid);
1868 if (ret > 0) {
1869 device->handler = handler;
1870 break;
1871 } else if (ret < 0) {
1872 break;
1873 }
1874 }
Rafael J. Wysocki87b85b32013-02-06 13:05:22 +01001875 }
Rafael J. Wysockica589f92013-01-30 14:27:29 +01001876 return ret;
1877}
1878
Rafael J. Wysocki0fc300b2012-12-21 00:36:41 +01001879static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1880 void *not_used, void **ret_not_used)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001881{
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001882 struct acpi_device *device;
1883 unsigned long long sta_not_used;
Rafael J. Wysockica589f92013-01-30 14:27:29 +01001884 int ret;
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001885
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001886 /*
1887 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1888 * namespace walks prematurely.
1889 */
Rafael J. Wysockica589f92013-01-30 14:27:29 +01001890 if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001891 return AE_OK;
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001892
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001893 if (acpi_bus_get_device(handle, &device))
1894 return AE_CTRL_DEPTH;
Thomas Renninger77796882010-01-29 17:48:52 +01001895
Rafael J. Wysockica589f92013-01-30 14:27:29 +01001896 ret = acpi_scan_attach_handler(device);
1897 if (ret)
1898 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1899
1900 ret = device_attach(&device->dev);
1901 return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001902}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001903
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01001904/**
1905 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1906 * @handle: Root of the namespace scope to scan.
Thomas Renninger77796882010-01-29 17:48:52 +01001907 *
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01001908 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1909 * found devices.
Thomas Renninger77796882010-01-29 17:48:52 +01001910 *
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01001911 * If no devices were found, -ENODEV is returned, but it does not mean that
1912 * there has been a real error. There just have been no suitable ACPI objects
1913 * in the table trunk from which the kernel could create a device and add an
1914 * appropriate driver.
Rafael J. Wysocki3757b942013-02-13 14:36:47 +01001915 *
1916 * Must be called under acpi_scan_lock.
Thomas Renninger77796882010-01-29 17:48:52 +01001917 */
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01001918int acpi_bus_scan(acpi_handle handle)
Rajesh Shah3fb02732005-04-28 00:25:52 -07001919{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001920 void *device = NULL;
Rafael J. Wysockic511cc12013-01-27 21:17:29 +01001921 int error = 0;
Rajesh Shah3fb02732005-04-28 00:25:52 -07001922
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001923 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
Rafael J. Wysockie3863092012-12-21 00:36:47 +01001925 acpi_bus_check_add, NULL, NULL, &device);
Rajesh Shah3fb02732005-04-28 00:25:52 -07001926
Thomas Renningerd2f66502010-01-29 17:48:51 +01001927 if (!device)
Rafael J. Wysockic511cc12013-01-27 21:17:29 +01001928 error = -ENODEV;
1929 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001930 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
Rafael J. Wysocki0fc300b2012-12-21 00:36:41 +01001931 acpi_bus_device_attach, NULL, NULL, NULL);
Thomas Renningerd2f66502010-01-29 17:48:51 +01001932
Rafael J. Wysockic511cc12013-01-27 21:17:29 +01001933 return error;
Rajesh Shah3fb02732005-04-28 00:25:52 -07001934}
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01001935EXPORT_SYMBOL(acpi_bus_scan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001937static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1938 void *not_used, void **ret_not_used)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939{
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001940 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001941
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001942 if (!acpi_bus_get_device(handle, &device)) {
Rafael J. Wysockica589f92013-01-30 14:27:29 +01001943 struct acpi_scan_handler *dev_handler = device->handler;
1944
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001945 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
Rafael J. Wysockica589f92013-01-30 14:27:29 +01001946 if (dev_handler) {
1947 if (dev_handler->detach)
1948 dev_handler->detach(device);
1949
1950 device->handler = NULL;
1951 } else {
1952 device_release_driver(&device->dev);
1953 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954 }
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001955 return AE_OK;
1956}
1957
1958static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1959 void *not_used, void **ret_not_used)
1960{
1961 struct acpi_device *device = NULL;
1962
1963 if (!acpi_bus_get_device(handle, &device))
1964 acpi_device_unregister(device);
1965
1966 return AE_OK;
1967}
1968
Rafael J. Wysocki3757b942013-02-13 14:36:47 +01001969/**
1970 * acpi_bus_trim - Remove ACPI device node and all of its descendants
1971 * @start: Root of the ACPI device nodes subtree to remove.
1972 *
1973 * Must be called under acpi_scan_lock.
1974 */
Rafael J. Wysockibfee26d2013-01-26 00:27:44 +01001975void acpi_bus_trim(struct acpi_device *start)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976{
Rafael J. Wysockicecdb192013-01-15 13:24:02 +01001977 /*
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001978 * Execute acpi_bus_device_detach() as a post-order callback to detach
1979 * all ACPI drivers from the device nodes being removed.
1980 */
1981 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1982 acpi_bus_device_detach, NULL, NULL);
1983 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1984 /*
Rafael J. Wysockicecdb192013-01-15 13:24:02 +01001985 * Execute acpi_bus_remove() as a post-order callback to remove device
1986 * nodes in the given namespace scope.
1987 */
1988 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1989 acpi_bus_remove, NULL, NULL);
1990 acpi_bus_remove(start->handle, 0, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001991}
Kristen Accardiceaba662006-02-23 17:56:01 -08001992EXPORT_SYMBOL_GPL(acpi_bus_trim);
1993
Bjorn Helgaase8b945c2009-09-21 19:28:59 +00001994static int acpi_bus_scan_fixed(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995{
Len Brown4be44fc2005-08-05 00:44:28 -04001996 int result = 0;
Li Shaohuac4168bf2006-12-07 20:56:41 +08001997
Linus Torvalds1da177e2005-04-16 15:20:36 -07001998 /*
1999 * Enumerate all fixed-feature devices.
2000 */
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01002001 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
2002 struct acpi_device *device = NULL;
2003
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00002004 result = acpi_add_single_object(&device, NULL,
Li Shaohuac4168bf2006-12-07 20:56:41 +08002005 ACPI_BUS_TYPE_POWER_BUTTON,
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01002006 ACPI_STA_DEFAULT);
2007 if (result)
2008 return result;
2009
2010 result = device_attach(&device->dev);
2011 if (result < 0)
2012 return result;
2013
Daniel Drakec10d7a132012-05-10 00:08:43 +01002014 device_init_wakeup(&device->dev, true);
Rajesh Shah3fb02732005-04-28 00:25:52 -07002015 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01002017 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
2018 struct acpi_device *device = NULL;
2019
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00002020 result = acpi_add_single_object(&device, NULL,
Li Shaohuac4168bf2006-12-07 20:56:41 +08002021 ACPI_BUS_TYPE_SLEEP_BUTTON,
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01002022 ACPI_STA_DEFAULT);
2023 if (result)
2024 return result;
2025
2026 result = device_attach(&device->dev);
Rajesh Shah3fb02732005-04-28 00:25:52 -07002027 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01002029 return result < 0 ? result : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030}
2031
Bjorn Helgaase747f272009-03-24 16:49:43 -06002032int __init acpi_scan_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002033{
2034 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002035
Patrick Mochel5b327262006-05-10 10:33:00 -04002036 result = bus_register(&acpi_bus_type);
2037 if (result) {
2038 /* We don't want to quit even if we failed to add suspend/resume */
2039 printk(KERN_ERR PREFIX "Could not register bus type\n");
2040 }
2041
Rafael J. Wysocki92ef2a22012-12-21 00:36:40 +01002042 acpi_pci_root_init();
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +01002043 acpi_pci_link_init();
Rafael J. Wysocki141a2972013-01-30 14:27:40 +01002044 acpi_platform_init();
Rafael J. Wysockif58b0822013-03-06 23:46:20 +01002045 acpi_lpss_init();
Rafael J. Wysocki737f1a92013-02-08 23:52:39 +01002046 acpi_container_init();
Rafael J. Wysocki0a347642013-03-03 23:18:03 +01002047 acpi_memory_hotplug_init();
Rafael J. Wysocki97d9a9e2010-11-25 00:10:02 +01002048
Rafael J. Wysocki3757b942013-02-13 14:36:47 +01002049 mutex_lock(&acpi_scan_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002050 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051 * Enumerate devices in the ACPI namespace.
2052 */
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01002053 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002054 if (result)
Rafael J. Wysocki3757b942013-02-13 14:36:47 +01002055 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01002057 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002058 if (result)
Rafael J. Wysocki3757b942013-02-13 14:36:47 +01002059 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002060
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01002061 result = acpi_bus_scan_fixed();
2062 if (result) {
2063 acpi_device_unregister(acpi_root);
Rafael J. Wysocki3757b942013-02-13 14:36:47 +01002064 goto out;
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01002065 }
2066
2067 acpi_update_all_gpes();
Rafael J. Wysocki3757b942013-02-13 14:36:47 +01002068
Yinghai Lu668192b2013-01-21 13:20:48 -08002069 acpi_pci_root_hp_init();
2070
Rafael J. Wysocki3757b942013-02-13 14:36:47 +01002071 out:
2072 mutex_unlock(&acpi_scan_lock);
2073 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002074}