blob: 8ab80bafe3f1604f3e05e7287ed5fe4f9ed1e6fb [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013
14#include <acpi/acpi_drivers.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
Bjorn Helgaase60cc7a2009-03-13 12:08:26 -060016#include "internal.h"
17
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#define _COMPONENT ACPI_BUS_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050019ACPI_MODULE_NAME("scan");
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#define STRUCT_TO_INT(s) (*((int*)&s))
Len Brown4be44fc2005-08-05 00:44:28 -040021extern struct acpi_device *acpi_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23#define ACPI_BUS_CLASS "system_bus"
Thomas Renninger29b71a12007-07-23 14:43:51 +020024#define ACPI_BUS_HID "LNXSYBUS"
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#define ACPI_BUS_DEVICE_NAME "System Bus"
26
Bjorn Helgaas859ac9a2009-09-21 19:29:50 +000027#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
28
Thomas Renninger620e1122010-10-01 10:54:00 +020029static const char *dummy_hid = "device";
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +020030
Linus Torvalds1da177e2005-04-16 15:20:36 -070031static LIST_HEAD(acpi_device_list);
Zhang Ruie49bd2d2006-12-08 17:23:43 +080032static LIST_HEAD(acpi_bus_id_list);
Shaohua Li90905892009-04-07 10:24:29 +080033DEFINE_MUTEX(acpi_device_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034LIST_HEAD(acpi_wakeup_device_list);
35
Zhang Ruie49bd2d2006-12-08 17:23:43 +080036struct acpi_device_bus_id{
Zhang Ruibb095852007-01-04 15:03:18 +080037 char bus_id[15];
Zhang Ruie49bd2d2006-12-08 17:23:43 +080038 unsigned int instance_no;
39 struct list_head node;
40};
Thomas Renninger29b71a12007-07-23 14:43:51 +020041
42/*
43 * Creates hid/cid(s) string needed for modalias and uevent
44 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
45 * char *modalias: "acpi:IBM0001:ACPI0001"
46*/
Adrian Bunkb3e572d2007-08-14 23:22:35 +020047static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
48 int size)
49{
Thomas Renninger29b71a12007-07-23 14:43:51 +020050 int len;
Zhang Rui5c9fcb52008-03-20 16:40:32 +080051 int count;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -060052 struct acpi_hardware_id *id;
Thomas Renninger29b71a12007-07-23 14:43:51 +020053
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +020054 if (list_empty(&acpi_dev->pnp.ids))
55 return 0;
56
Zhang Rui5c9fcb52008-03-20 16:40:32 +080057 len = snprintf(modalias, size, "acpi:");
Thomas Renninger29b71a12007-07-23 14:43:51 +020058 size -= len;
59
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -060060 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
61 count = snprintf(&modalias[len], size, "%s:", id->id);
Zhang Rui5c9fcb52008-03-20 16:40:32 +080062 if (count < 0 || count >= size)
63 return -EINVAL;
64 len += count;
65 size -= count;
66 }
67
Thomas Renninger29b71a12007-07-23 14:43:51 +020068 modalias[len] = '\0';
69 return len;
70}
71
72static ssize_t
73acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
74 struct acpi_device *acpi_dev = to_acpi_device(dev);
75 int len;
76
77 /* Device has no HID and no CID or string is >1024 */
78 len = create_modalias(acpi_dev, buf, 1024);
79 if (len <= 0)
80 return 0;
81 buf[len++] = '\n';
82 return len;
83}
84static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
85
Zhang Ruic8d72a52009-06-22 11:31:16 +080086static void acpi_bus_hot_remove_device(void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087{
Zhang Rui26d46862008-04-29 02:35:48 -040088 struct acpi_device *device;
89 acpi_handle handle = context;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 struct acpi_object_list arg_list;
91 union acpi_object arg;
92 acpi_status status = AE_OK;
93
Zhang Rui26d46862008-04-29 02:35:48 -040094 if (acpi_bus_get_device(handle, &device))
Zhang Ruic8d72a52009-06-22 11:31:16 +080095 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
Zhang Rui26d46862008-04-29 02:35:48 -040097 if (!device)
Zhang Ruic8d72a52009-06-22 11:31:16 +080098 return;
Zhang Rui26d46862008-04-29 02:35:48 -040099
100 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Kay Sievers07944692008-10-30 01:18:59 +0100101 "Hot-removing device %s...\n", dev_name(&device->dev)));
Zhang Rui26d46862008-04-29 02:35:48 -0400102
103 if (acpi_bus_trim(device, 1)) {
Lin Ming55ac9a02008-09-28 14:51:56 +0800104 printk(KERN_ERR PREFIX
105 "Removing device failed\n");
Zhang Ruic8d72a52009-06-22 11:31:16 +0800106 return;
Zhang Rui26d46862008-04-29 02:35:48 -0400107 }
108
109 /* power off device */
110 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
111 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
Lin Ming55ac9a02008-09-28 14:51:56 +0800112 printk(KERN_WARNING PREFIX
113 "Power-off device failed\n");
Zhang Rui26d46862008-04-29 02:35:48 -0400114
115 if (device->flags.lockable) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 arg_list.count = 1;
117 arg_list.pointer = &arg;
118 arg.type = ACPI_TYPE_INTEGER;
119 arg.integer.value = 0;
120 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
121 }
122
123 arg_list.count = 1;
124 arg_list.pointer = &arg;
125 arg.type = ACPI_TYPE_INTEGER;
126 arg.integer.value = 1;
127
128 /*
129 * TBD: _EJD support.
130 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
Zhang Rui26d46862008-04-29 02:35:48 -0400132 if (ACPI_FAILURE(status))
Zhang Ruic8d72a52009-06-22 11:31:16 +0800133 printk(KERN_WARNING PREFIX
134 "Eject device failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Zhang Ruic8d72a52009-06-22 11:31:16 +0800136 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137}
138
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139static ssize_t
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800140acpi_eject_store(struct device *d, struct device_attribute *attr,
141 const char *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142{
Len Brown4be44fc2005-08-05 00:44:28 -0400143 int ret = count;
Len Brown4be44fc2005-08-05 00:44:28 -0400144 acpi_status status;
Len Brown4be44fc2005-08-05 00:44:28 -0400145 acpi_object_type type = 0;
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800146 struct acpi_device *acpi_device = to_acpi_device(d);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148 if ((!count) || (buf[0] != '1')) {
149 return -EINVAL;
150 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151#ifndef FORCE_EJECT
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800152 if (acpi_device->driver == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 ret = -ENODEV;
154 goto err;
155 }
156#endif
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800157 status = acpi_get_type(acpi_device->handle, &type);
158 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 ret = -ENODEV;
160 goto err;
161 }
162
Zhang Ruic8d72a52009-06-22 11:31:16 +0800163 acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
Alok N Kataria74523c92008-06-13 12:54:24 -0400164err:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166}
167
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800168static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800170static ssize_t
171acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
172 struct acpi_device *acpi_dev = to_acpi_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Bjorn Helgaasea8d82f2009-09-21 13:35:09 -0600174 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800175}
176static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
177
178static ssize_t
179acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
180 struct acpi_device *acpi_dev = to_acpi_device(dev);
181 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
182 int result;
183
184 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
Alex Chiang0c526d92009-05-14 08:31:37 -0600185 if (result)
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800186 goto end;
187
188 result = sprintf(buf, "%s\n", (char*)path.pointer);
189 kfree(path.pointer);
Alex Chiang0c526d92009-05-14 08:31:37 -0600190end:
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800191 return result;
192}
193static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
194
195static int acpi_device_setup_files(struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800197 acpi_status status;
198 acpi_handle temp;
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800199 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800201 /*
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800202 * Devices gotten from FADT don't have a "path" attribute
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800203 */
Alex Chiang0c526d92009-05-14 08:31:37 -0600204 if (dev->handle) {
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800205 result = device_create_file(&dev->dev, &dev_attr_path);
Alex Chiang0c526d92009-05-14 08:31:37 -0600206 if (result)
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800207 goto end;
208 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200210 if (!list_empty(&dev->pnp.ids)) {
211 result = device_create_file(&dev->dev, &dev_attr_hid);
212 if (result)
213 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200215 result = device_create_file(&dev->dev, &dev_attr_modalias);
216 if (result)
217 goto end;
218 }
Thomas Renninger29b71a12007-07-23 14:43:51 +0200219
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800220 /*
221 * If device has _EJ0, 'eject' file is created that is used to trigger
222 * hot-removal function from userland.
223 */
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800224 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
225 if (ACPI_SUCCESS(status))
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800226 result = device_create_file(&dev->dev, &dev_attr_eject);
Alex Chiang0c526d92009-05-14 08:31:37 -0600227end:
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800228 return result;
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800229}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800231static void acpi_device_remove_files(struct acpi_device *dev)
232{
233 acpi_status status;
234 acpi_handle temp;
235
236 /*
237 * If device has _EJ0, 'eject' file is created that is used to trigger
238 * hot-removal function from userland.
239 */
240 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
241 if (ACPI_SUCCESS(status))
242 device_remove_file(&dev->dev, &dev_attr_eject);
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800243
Bjorn Helgaas1131b932009-09-21 13:35:29 -0600244 device_remove_file(&dev->dev, &dev_attr_modalias);
245 device_remove_file(&dev->dev, &dev_attr_hid);
Alex Chiang0c526d92009-05-14 08:31:37 -0600246 if (dev->handle)
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800247 device_remove_file(&dev->dev, &dev_attr_path);
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800248}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249/* --------------------------------------------------------------------------
Zhang Rui9e89dde2006-12-07 20:56:16 +0800250 ACPI Bus operations
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 -------------------------------------------------------------------------- */
Thomas Renninger29b71a12007-07-23 14:43:51 +0200252
253int acpi_match_device_ids(struct acpi_device *device,
254 const struct acpi_device_id *ids)
255{
256 const struct acpi_device_id *id;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600257 struct acpi_hardware_id *hwid;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200258
Zhao Yakui39a0ad82008-08-11 13:40:22 +0800259 /*
260 * If the device is not present, it is unnecessary to load device
261 * driver for it.
262 */
263 if (!device->status.present)
264 return -ENODEV;
265
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600266 for (id = ids; id->id[0]; id++)
267 list_for_each_entry(hwid, &device->pnp.ids, list)
268 if (!strcmp((char *) id->id, hwid->id))
Thomas Renninger29b71a12007-07-23 14:43:51 +0200269 return 0;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200270
271 return -ENOENT;
272}
273EXPORT_SYMBOL(acpi_match_device_ids);
274
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600275static void acpi_free_ids(struct acpi_device *device)
276{
277 struct acpi_hardware_id *id, *tmp;
278
279 list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
280 kfree(id->id);
281 kfree(id);
282 }
283}
284
Patrick Mochel1890a972006-12-07 20:56:31 +0800285static void acpi_device_release(struct device *dev)
286{
287 struct acpi_device *acpi_dev = to_acpi_device(dev);
288
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600289 acpi_free_ids(acpi_dev);
Patrick Mochel1890a972006-12-07 20:56:31 +0800290 kfree(acpi_dev);
291}
292
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800293static int acpi_device_suspend(struct device *dev, pm_message_t state)
Zhang Rui9e89dde2006-12-07 20:56:16 +0800294{
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800295 struct acpi_device *acpi_dev = to_acpi_device(dev);
296 struct acpi_driver *acpi_drv = acpi_dev->driver;
Zhang Rui9e89dde2006-12-07 20:56:16 +0800297
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800298 if (acpi_drv && acpi_drv->ops.suspend)
299 return acpi_drv->ops.suspend(acpi_dev, state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 return 0;
301}
302
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800303static int acpi_device_resume(struct device *dev)
304{
305 struct acpi_device *acpi_dev = to_acpi_device(dev);
306 struct acpi_driver *acpi_drv = acpi_dev->driver;
307
308 if (acpi_drv && acpi_drv->ops.resume)
309 return acpi_drv->ops.resume(acpi_dev);
310 return 0;
311}
312
313static int acpi_bus_match(struct device *dev, struct device_driver *drv)
314{
315 struct acpi_device *acpi_dev = to_acpi_device(dev);
316 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
317
Thomas Renninger29b71a12007-07-23 14:43:51 +0200318 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800319}
320
Kay Sievers7eff2e72007-08-14 15:15:12 +0200321static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800322{
323 struct acpi_device *acpi_dev = to_acpi_device(dev);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200324 int len;
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800325
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200326 if (list_empty(&acpi_dev->pnp.ids))
327 return 0;
328
Kay Sievers7eff2e72007-08-14 15:15:12 +0200329 if (add_uevent_var(env, "MODALIAS="))
330 return -ENOMEM;
331 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
332 sizeof(env->buf) - env->buflen);
333 if (len >= (sizeof(env->buf) - env->buflen))
334 return -ENOMEM;
335 env->buflen += len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 return 0;
337}
338
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000339static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
340{
341 struct acpi_device *device = data;
342
343 device->driver->ops.notify(device, event);
344}
345
346static acpi_status acpi_device_notify_fixed(void *data)
347{
348 struct acpi_device *device = data;
349
Bjorn Helgaas53de5352009-08-31 22:32:20 +0000350 /* Fixed hardware devices have no handles */
351 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000352 return AE_OK;
353}
354
355static int acpi_device_install_notify_handler(struct acpi_device *device)
356{
357 acpi_status status;
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000358
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000359 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000360 status =
361 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
362 acpi_device_notify_fixed,
363 device);
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000364 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000365 status =
366 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
367 acpi_device_notify_fixed,
368 device);
369 else
370 status = acpi_install_notify_handler(device->handle,
371 ACPI_DEVICE_NOTIFY,
372 acpi_device_notify,
373 device);
374
375 if (ACPI_FAILURE(status))
376 return -EINVAL;
377 return 0;
378}
379
380static void acpi_device_remove_notify_handler(struct acpi_device *device)
381{
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000382 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000383 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
384 acpi_device_notify_fixed);
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000385 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000386 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
387 acpi_device_notify_fixed);
388 else
389 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
390 acpi_device_notify);
391}
392
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800393static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
394static int acpi_start_single_object(struct acpi_device *);
395static int acpi_device_probe(struct device * dev)
Zhang Rui9e89dde2006-12-07 20:56:16 +0800396{
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800397 struct acpi_device *acpi_dev = to_acpi_device(dev);
398 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
399 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800401 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
402 if (!ret) {
Li Shaohuac4168bf2006-12-07 20:56:41 +0800403 if (acpi_dev->bus_ops.acpi_op_start)
404 acpi_start_single_object(acpi_dev);
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000405
406 if (acpi_drv->ops.notify) {
407 ret = acpi_device_install_notify_handler(acpi_dev);
408 if (ret) {
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000409 if (acpi_drv->ops.remove)
410 acpi_drv->ops.remove(acpi_dev,
411 acpi_dev->removal_type);
412 return ret;
413 }
414 }
415
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800416 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
417 "Found driver [%s] for device [%s]\n",
418 acpi_drv->name, acpi_dev->pnp.bus_id));
419 get_device(dev);
Zhang Rui9e89dde2006-12-07 20:56:16 +0800420 }
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800421 return ret;
422}
423
424static int acpi_device_remove(struct device * dev)
425{
426 struct acpi_device *acpi_dev = to_acpi_device(dev);
427 struct acpi_driver *acpi_drv = acpi_dev->driver;
428
429 if (acpi_drv) {
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000430 if (acpi_drv->ops.notify)
431 acpi_device_remove_notify_handler(acpi_dev);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800432 if (acpi_drv->ops.remove)
Li Shaohua96333572006-12-07 20:56:46 +0800433 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800434 }
435 acpi_dev->driver = NULL;
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700436 acpi_dev->driver_data = NULL;
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800437
438 put_device(dev);
Zhang Rui9e89dde2006-12-07 20:56:16 +0800439 return 0;
440}
441
David Brownell55955aa2007-05-08 00:28:35 -0700442struct bus_type acpi_bus_type = {
Zhang Rui9e89dde2006-12-07 20:56:16 +0800443 .name = "acpi",
444 .suspend = acpi_device_suspend,
445 .resume = acpi_device_resume,
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800446 .match = acpi_bus_match,
447 .probe = acpi_device_probe,
448 .remove = acpi_device_remove,
449 .uevent = acpi_device_uevent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450};
451
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +0000452static int acpi_device_register(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453{
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800454 int result;
455 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
456 int found = 0;
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +0000457
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 /*
459 * Linkage
460 * -------
461 * Link this device to its parent and siblings.
462 */
463 INIT_LIST_HEAD(&device->children);
464 INIT_LIST_HEAD(&device->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 INIT_LIST_HEAD(&device->wakeup_list);
466
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800467 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
468 if (!new_bus_id) {
469 printk(KERN_ERR PREFIX "Memory allocation error\n");
470 return -ENOMEM;
471 }
472
Shaohua Li90905892009-04-07 10:24:29 +0800473 mutex_lock(&acpi_device_lock);
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800474 /*
475 * Find suitable bus_id and instance number in acpi_bus_id_list
476 * If failed, create one and link it into acpi_bus_id_list
477 */
478 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
Bjorn Helgaas1131b932009-09-21 13:35:29 -0600479 if (!strcmp(acpi_device_bus_id->bus_id,
480 acpi_device_hid(device))) {
481 acpi_device_bus_id->instance_no++;
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800482 found = 1;
483 kfree(new_bus_id);
484 break;
485 }
486 }
Alex Chiang0c526d92009-05-14 08:31:37 -0600487 if (!found) {
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800488 acpi_device_bus_id = new_bus_id;
Bjorn Helgaas1131b932009-09-21 13:35:29 -0600489 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800490 acpi_device_bus_id->instance_no = 0;
491 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
492 }
Kay Sievers07944692008-10-30 01:18:59 +0100493 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800494
Len Brown33b57152008-12-15 22:09:26 -0500495 if (device->parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 list_add_tail(&device->node, &device->parent->children);
Len Brown33b57152008-12-15 22:09:26 -0500497
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 if (device->wakeup.flags.valid)
499 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
Shaohua Li90905892009-04-07 10:24:29 +0800500 mutex_unlock(&acpi_device_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
Patrick Mochel1890a972006-12-07 20:56:31 +0800502 if (device->parent)
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +0000503 device->dev.parent = &device->parent->dev;
Patrick Mochel1890a972006-12-07 20:56:31 +0800504 device->dev.bus = &acpi_bus_type;
Patrick Mochel1890a972006-12-07 20:56:31 +0800505 device->dev.release = &acpi_device_release;
Alex Chiang8b12b922009-05-14 08:31:32 -0600506 result = device_register(&device->dev);
Alex Chiang0c526d92009-05-14 08:31:37 -0600507 if (result) {
Alex Chiang8b12b922009-05-14 08:31:32 -0600508 dev_err(&device->dev, "Error registering device\n");
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800509 goto end;
510 }
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800511
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800512 result = acpi_device_setup_files(device);
Alex Chiang0c526d92009-05-14 08:31:37 -0600513 if (result)
Kay Sievers07944692008-10-30 01:18:59 +0100514 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
515 dev_name(&device->dev));
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800516
Li Shaohua96333572006-12-07 20:56:46 +0800517 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800518 return 0;
Alex Chiang0c526d92009-05-14 08:31:37 -0600519end:
Shaohua Li90905892009-04-07 10:24:29 +0800520 mutex_lock(&acpi_device_lock);
Len Brown33b57152008-12-15 22:09:26 -0500521 if (device->parent)
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800522 list_del(&device->node);
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800523 list_del(&device->wakeup_list);
Shaohua Li90905892009-04-07 10:24:29 +0800524 mutex_unlock(&acpi_device_lock);
Zhang Ruie49bd2d2006-12-08 17:23:43 +0800525 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526}
527
528static void acpi_device_unregister(struct acpi_device *device, int type)
529{
Shaohua Li90905892009-04-07 10:24:29 +0800530 mutex_lock(&acpi_device_lock);
Len Brown33b57152008-12-15 22:09:26 -0500531 if (device->parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 list_del(&device->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
534 list_del(&device->wakeup_list);
Shaohua Li90905892009-04-07 10:24:29 +0800535 mutex_unlock(&acpi_device_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
537 acpi_detach_data(device->handle, acpi_bus_data_handler);
Patrick Mochel1890a972006-12-07 20:56:31 +0800538
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800539 acpi_device_remove_files(device);
Patrick Mochel1890a972006-12-07 20:56:31 +0800540 device_unregister(&device->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541}
542
Zhang Rui9e89dde2006-12-07 20:56:16 +0800543/* --------------------------------------------------------------------------
544 Driver Management
545 -------------------------------------------------------------------------- */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546/**
Randy Dunlapd758a8f2006-01-06 01:31:00 -0500547 * acpi_bus_driver_init - add a device to a driver
548 * @device: the device to add and initialize
549 * @driver: driver for the device
550 *
Alex Chiang0c526d92009-05-14 08:31:37 -0600551 * Used to initialize a device via its device driver. Called whenever a
Patrick Mochel1890a972006-12-07 20:56:31 +0800552 * driver is bound to a device. Invokes the driver's add() ops.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 */
554static int
Len Brown4be44fc2005-08-05 00:44:28 -0400555acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556{
Len Brown4be44fc2005-08-05 00:44:28 -0400557 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 if (!device || !driver)
Patrick Mocheld550d982006-06-27 00:41:40 -0400560 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
562 if (!driver->ops.add)
Patrick Mocheld550d982006-06-27 00:41:40 -0400563 return -ENOSYS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564
565 result = driver->ops.add(device);
566 if (result) {
567 device->driver = NULL;
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700568 device->driver_data = NULL;
Patrick Mocheld550d982006-06-27 00:41:40 -0400569 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 }
571
572 device->driver = driver;
573
574 /*
575 * TBD - Configuration Management: Assign resources to device based
576 * upon possible configuration and currently allocated resources.
577 */
578
Len Brown4be44fc2005-08-05 00:44:28 -0400579 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
580 "Driver successfully bound to device\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400581 return 0;
Rajesh Shah3fb02732005-04-28 00:25:52 -0700582}
583
Adrian Bunk8713cbe2005-09-02 17:16:48 -0400584static int acpi_start_single_object(struct acpi_device *device)
Rajesh Shah3fb02732005-04-28 00:25:52 -0700585{
586 int result = 0;
587 struct acpi_driver *driver;
588
Rajesh Shah3fb02732005-04-28 00:25:52 -0700589
590 if (!(driver = device->driver))
Patrick Mocheld550d982006-06-27 00:41:40 -0400591 return 0;
Rajesh Shah3fb02732005-04-28 00:25:52 -0700592
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 if (driver->ops.start) {
594 result = driver->ops.start(device);
595 if (result && driver->ops.remove)
596 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 }
598
Patrick Mocheld550d982006-06-27 00:41:40 -0400599 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600}
601
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602/**
Randy Dunlapd758a8f2006-01-06 01:31:00 -0500603 * acpi_bus_register_driver - register a driver with the ACPI bus
604 * @driver: driver being registered
605 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 * Registers a driver with the ACPI bus. Searches the namespace for all
Bjorn Helgaas9d9f7492006-03-28 17:04:00 -0500607 * devices that match the driver's criteria and binds. Returns zero for
608 * success or a negative error status for failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 */
Len Brown4be44fc2005-08-05 00:44:28 -0400610int acpi_bus_register_driver(struct acpi_driver *driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611{
Patrick Mochel1890a972006-12-07 20:56:31 +0800612 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
614 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400615 return -ENODEV;
Patrick Mochel1890a972006-12-07 20:56:31 +0800616 driver->drv.name = driver->name;
617 driver->drv.bus = &acpi_bus_type;
618 driver->drv.owner = driver->owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
Patrick Mochel1890a972006-12-07 20:56:31 +0800620 ret = driver_register(&driver->drv);
621 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623
Len Brown4be44fc2005-08-05 00:44:28 -0400624EXPORT_SYMBOL(acpi_bus_register_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625
626/**
Randy Dunlapd758a8f2006-01-06 01:31:00 -0500627 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
628 * @driver: driver to unregister
629 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 * Unregisters a driver with the ACPI bus. Searches the namespace for all
631 * devices that match the driver's criteria and unbinds.
632 */
Bjorn Helgaas06ea8e02006-04-27 05:25:00 -0400633void acpi_bus_unregister_driver(struct acpi_driver *driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634{
Patrick Mochel1890a972006-12-07 20:56:31 +0800635 driver_unregister(&driver->drv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636}
Len Brown4be44fc2005-08-05 00:44:28 -0400637
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638EXPORT_SYMBOL(acpi_bus_unregister_driver);
639
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640/* --------------------------------------------------------------------------
641 Device Enumeration
642 -------------------------------------------------------------------------- */
Bjorn Helgaas5c478f42009-09-21 19:29:35 +0000643static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
644{
645 acpi_status status;
646 int ret;
647 struct acpi_device *device;
648
649 /*
650 * Fixed hardware devices do not appear in the namespace and do not
651 * have handles, but we fabricate acpi_devices for them, so we have
652 * to deal with them specially.
653 */
654 if (handle == NULL)
655 return acpi_root;
656
657 do {
658 status = acpi_get_parent(handle, &handle);
659 if (status == AE_NULL_ENTRY)
660 return NULL;
661 if (ACPI_FAILURE(status))
662 return acpi_root;
663
664 ret = acpi_bus_get_device(handle, &device);
665 if (ret == 0)
666 return device;
667 } while (1);
668}
669
Len Brownc8f7a622006-07-09 17:22:28 -0400670acpi_status
671acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
672{
673 acpi_status status;
674 acpi_handle tmp;
675 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
676 union acpi_object *obj;
677
678 status = acpi_get_handle(handle, "_EJD", &tmp);
679 if (ACPI_FAILURE(status))
680 return status;
681
682 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
683 if (ACPI_SUCCESS(status)) {
684 obj = buffer.pointer;
Holger Macht3b5fee52008-02-14 13:40:34 +0100685 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
686 ejd);
Len Brownc8f7a622006-07-09 17:22:28 -0400687 kfree(buffer.pointer);
688 }
689 return status;
690}
691EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
692
Bob Moore8e4319c2009-06-29 13:43:27 +0800693void acpi_bus_data_handler(acpi_handle handle, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694{
695
696 /* TBD */
697
698 return;
699}
700
Zhang Rui9e89dde2006-12-07 20:56:16 +0800701static int acpi_bus_get_perf_flags(struct acpi_device *device)
702{
703 device->performance.state = ACPI_STATE_UNKNOWN;
704 return 0;
705}
706
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707static acpi_status
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100708acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
709 struct acpi_device_wakeup *wakeup)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710{
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100711 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
712 union acpi_object *package = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 union acpi_object *element = NULL;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100714 acpi_status status;
715 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100717 if (!wakeup)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 return AE_BAD_PARAMETER;
719
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100720 /* _PRW */
721 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
722 if (ACPI_FAILURE(status)) {
723 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
724 return status;
725 }
726
727 package = (union acpi_object *)buffer.pointer;
728
729 if (!package || (package->package.count < 2)) {
730 status = AE_BAD_DATA;
731 goto out;
732 }
733
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 element = &(package->package.elements[0]);
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100735 if (!element) {
736 status = AE_BAD_DATA;
737 goto out;
738 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 if (element->type == ACPI_TYPE_PACKAGE) {
740 if ((element->package.count < 2) ||
741 (element->package.elements[0].type !=
742 ACPI_TYPE_LOCAL_REFERENCE)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100743 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
744 status = AE_BAD_DATA;
745 goto out;
746 }
747 wakeup->gpe_device =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 element->package.elements[0].reference.handle;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100749 wakeup->gpe_number =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 (u32) element->package.elements[1].integer.value;
751 } else if (element->type == ACPI_TYPE_INTEGER) {
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100752 wakeup->gpe_device = NULL;
753 wakeup->gpe_number = element->integer.value;
754 } else {
755 status = AE_BAD_DATA;
756 goto out;
757 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758
759 element = &(package->package.elements[1]);
760 if (element->type != ACPI_TYPE_INTEGER) {
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100761 status = AE_BAD_DATA;
762 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 }
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100764 wakeup->sleep_state = element->integer.value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765
766 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100767 status = AE_NO_MEMORY;
768 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 }
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100770 wakeup->resources.count = package->package.count - 2;
771 for (i = 0; i < wakeup->resources.count; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772 element = &(package->package.elements[i + 2]);
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100773 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
774 status = AE_BAD_DATA;
775 goto out;
776 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100778 wakeup->resources.handles[i] = element->reference.handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 }
780
Lin Mingbba63a22010-12-13 13:39:17 +0800781 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
Rafael J. Wysocki98746472010-07-08 00:43:36 +0200782
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100783 out:
784 kfree(buffer.pointer);
785
786 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787}
788
Rafael J. Wysockif5177092010-02-17 23:41:49 +0100789static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790{
Thomas Renninger29b71a12007-07-23 14:43:51 +0200791 struct acpi_device_id button_device_ids[] = {
792 {"PNP0C0D", 0},
793 {"PNP0C0C", 0},
794 {"PNP0C0E", 0},
795 {"", 0},
796 };
Rafael J. Wysockif5177092010-02-17 23:41:49 +0100797 acpi_status status;
798 acpi_event_status event_status;
799
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100800 device->wakeup.flags.notifier_present = 0;
Rafael J. Wysockif5177092010-02-17 23:41:49 +0100801
802 /* Power button, Lid switch always enable wakeup */
803 if (!acpi_match_device_ids(device, button_device_ids)) {
804 device->wakeup.flags.run_wake = 1;
Rafael J. Wysockif2b56bc2011-01-06 23:34:22 +0100805 device_set_wakeup_capable(&device->dev, true);
Rafael J. Wysockif5177092010-02-17 23:41:49 +0100806 return;
807 }
808
Rafael J. Wysockie8e18c92010-07-08 00:42:51 +0200809 status = acpi_get_gpe_status(device->wakeup.gpe_device,
810 device->wakeup.gpe_number,
811 &event_status);
Rafael J. Wysockif5177092010-02-17 23:41:49 +0100812 if (status == AE_OK)
813 device->wakeup.flags.run_wake =
814 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
815}
816
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +0100817static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
Rafael J. Wysockif5177092010-02-17 23:41:49 +0100818{
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +0100819 acpi_handle temp;
Rafael J. Wysockif5177092010-02-17 23:41:49 +0100820 acpi_status status = 0;
Rafael J. Wysockif5177092010-02-17 23:41:49 +0100821 int psw_error;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200822
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +0100823 /* Presence of _PRW indicates wake capable */
824 status = acpi_get_handle(device->handle, "_PRW", &temp);
825 if (ACPI_FAILURE(status))
826 return;
827
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100828 status = acpi_bus_extract_wakeup_device_power_package(device->handle,
829 &device->wakeup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 if (ACPI_FAILURE(status)) {
831 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +0100832 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 }
834
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 device->wakeup.flags.valid = 1;
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +0200836 device->wakeup.prepare_count = 0;
Rafael J. Wysockif5177092010-02-17 23:41:49 +0100837 acpi_bus_set_run_wake_flags(device);
Zhao Yakui729b2bd2008-03-19 13:26:54 +0800838 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
839 * system for the ACPI device with the _PRW object.
840 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
841 * So it is necessary to call _DSW object first. Only when it is not
842 * present will the _PSW object used.
843 */
Rafael J. Wysocki77e76602008-07-07 03:33:34 +0200844 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
845 if (psw_error)
846 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
847 "error in _DSW or _PSW evaluation\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848}
849
Rafael J. Wysockibf325f92010-11-25 00:10:44 +0100850static void acpi_bus_add_power_resource(acpi_handle handle);
851
Zhang Rui9e89dde2006-12-07 20:56:16 +0800852static int acpi_bus_get_power_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853{
Zhang Rui9e89dde2006-12-07 20:56:16 +0800854 acpi_status status = 0;
855 acpi_handle handle = NULL;
856 u32 i = 0;
857
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858
859 /*
Zhang Rui9e89dde2006-12-07 20:56:16 +0800860 * Power Management Flags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 */
Zhang Rui9e89dde2006-12-07 20:56:16 +0800862 status = acpi_get_handle(device->handle, "_PSC", &handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 if (ACPI_SUCCESS(status))
Zhang Rui9e89dde2006-12-07 20:56:16 +0800864 device->power.flags.explicit_get = 1;
865 status = acpi_get_handle(device->handle, "_IRC", &handle);
866 if (ACPI_SUCCESS(status))
867 device->power.flags.inrush_current = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
869 /*
Zhang Rui9e89dde2006-12-07 20:56:16 +0800870 * Enumerate supported power management states
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 */
Zhang Rui9e89dde2006-12-07 20:56:16 +0800872 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
873 struct acpi_device_power_state *ps = &device->power.states[i];
874 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875
Zhang Rui9e89dde2006-12-07 20:56:16 +0800876 /* Evaluate "_PRx" to se if power resources are referenced */
877 acpi_evaluate_reference(device->handle, object_name, NULL,
878 &ps->resources);
879 if (ps->resources.count) {
Rafael J. Wysockibf325f92010-11-25 00:10:44 +0100880 int j;
881
Zhang Rui9e89dde2006-12-07 20:56:16 +0800882 device->power.flags.power_resources = 1;
883 ps->flags.valid = 1;
Rafael J. Wysockibf325f92010-11-25 00:10:44 +0100884 for (j = 0; j < ps->resources.count; j++)
885 acpi_bus_add_power_resource(ps->resources.handles[j]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887
Zhang Rui9e89dde2006-12-07 20:56:16 +0800888 /* Evaluate "_PSx" to see if we can do explicit sets */
889 object_name[2] = 'S';
890 status = acpi_get_handle(device->handle, object_name, &handle);
891 if (ACPI_SUCCESS(status)) {
892 ps->flags.explicit_set = 1;
893 ps->flags.valid = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 }
Zhang Rui9e89dde2006-12-07 20:56:16 +0800895
896 /* State is valid if we have some power control */
897 if (ps->resources.count || ps->flags.explicit_set)
898 ps->flags.valid = 1;
899
900 ps->power = -1; /* Unknown - driver assigned */
901 ps->latency = -1; /* Unknown - driver assigned */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903
Zhang Rui9e89dde2006-12-07 20:56:16 +0800904 /* Set defaults for D0 and D3 states (always valid) */
905 device->power.states[ACPI_STATE_D0].flags.valid = 1;
906 device->power.states[ACPI_STATE_D0].power = 100;
907 device->power.states[ACPI_STATE_D3].flags.valid = 1;
908 device->power.states[ACPI_STATE_D3].power = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909
Rafael J. Wysockiade3e7f2010-11-25 00:08:36 +0100910 acpi_bus_init_power(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911
912 return 0;
913}
914
Len Brown4be44fc2005-08-05 00:44:28 -0400915static int acpi_bus_get_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916{
Len Brown4be44fc2005-08-05 00:44:28 -0400917 acpi_status status = AE_OK;
918 acpi_handle temp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920
921 /* Presence of _STA indicates 'dynamic_status' */
922 status = acpi_get_handle(device->handle, "_STA", &temp);
923 if (ACPI_SUCCESS(status))
924 device->flags.dynamic_status = 1;
925
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 /* Presence of _RMV indicates 'removable' */
927 status = acpi_get_handle(device->handle, "_RMV", &temp);
928 if (ACPI_SUCCESS(status))
929 device->flags.removable = 1;
930
931 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
932 status = acpi_get_handle(device->handle, "_EJD", &temp);
933 if (ACPI_SUCCESS(status))
934 device->flags.ejectable = 1;
935 else {
936 status = acpi_get_handle(device->handle, "_EJ0", &temp);
937 if (ACPI_SUCCESS(status))
938 device->flags.ejectable = 1;
939 }
940
941 /* Presence of _LCK indicates 'lockable' */
942 status = acpi_get_handle(device->handle, "_LCK", &temp);
943 if (ACPI_SUCCESS(status))
944 device->flags.lockable = 1;
945
Rafael J. Wysocki7bed50c2011-04-26 11:33:18 +0200946 /* Power resources cannot be power manageable. */
947 if (device->device_type == ACPI_BUS_TYPE_POWER)
948 return 0;
949
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 /* Presence of _PS0|_PR0 indicates 'power manageable' */
951 status = acpi_get_handle(device->handle, "_PS0", &temp);
952 if (ACPI_FAILURE(status))
953 status = acpi_get_handle(device->handle, "_PR0", &temp);
954 if (ACPI_SUCCESS(status))
955 device->flags.power_manageable = 1;
956
Joe Perches3c5f9be2008-02-03 17:06:17 +0200957 /* TBD: Performance management */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958
Patrick Mocheld550d982006-06-27 00:41:40 -0400959 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960}
961
Bjorn Helgaasc7bcb4e2009-09-21 19:29:25 +0000962static void acpi_device_get_busid(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963{
Len Brown4be44fc2005-08-05 00:44:28 -0400964 char bus_id[5] = { '?', 0 };
965 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
966 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967
968 /*
969 * Bus ID
970 * ------
971 * The device's Bus ID is simply the object name.
972 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
973 */
Bjorn Helgaas859ac9a2009-09-21 19:29:50 +0000974 if (ACPI_IS_ROOT_DEVICE(device)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 strcpy(device->pnp.bus_id, "ACPI");
Bjorn Helgaas859ac9a2009-09-21 19:29:50 +0000976 return;
977 }
978
979 switch (device->device_type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 case ACPI_BUS_TYPE_POWER_BUTTON:
981 strcpy(device->pnp.bus_id, "PWRF");
982 break;
983 case ACPI_BUS_TYPE_SLEEP_BUTTON:
984 strcpy(device->pnp.bus_id, "SLPF");
985 break;
986 default:
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +0000987 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 /* Clean up trailing underscores (if any) */
989 for (i = 3; i > 1; i--) {
990 if (bus_id[i] == '_')
991 bus_id[i] = '\0';
992 else
993 break;
994 }
995 strcpy(device->pnp.bus_id, bus_id);
996 break;
997 }
998}
999
Zhang Rui54735262007-01-11 02:09:09 -05001000/*
1001 * acpi_bay_match - see if a device is an ejectable driver bay
1002 *
1003 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1004 * then we can safely call it an ejectable drive bay
1005 */
1006static int acpi_bay_match(struct acpi_device *device){
1007 acpi_status status;
1008 acpi_handle handle;
1009 acpi_handle tmp;
1010 acpi_handle phandle;
1011
1012 handle = device->handle;
1013
1014 status = acpi_get_handle(handle, "_EJ0", &tmp);
1015 if (ACPI_FAILURE(status))
1016 return -ENODEV;
1017
1018 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1019 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1020 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1021 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1022 return 0;
1023
1024 if (acpi_get_parent(handle, &phandle))
1025 return -ENODEV;
1026
1027 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1028 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1029 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1030 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1031 return 0;
1032
1033 return -ENODEV;
1034}
1035
Frank Seidel3620f2f2007-12-07 13:20:34 +01001036/*
1037 * acpi_dock_match - see if a device has a _DCK method
1038 */
1039static int acpi_dock_match(struct acpi_device *device)
1040{
1041 acpi_handle tmp;
1042 return acpi_get_handle(device->handle, "_DCK", &tmp);
1043}
1044
Thomas Renninger620e1122010-10-01 10:54:00 +02001045const char *acpi_device_hid(struct acpi_device *device)
Bob Moore15b8dd52009-06-29 13:39:29 +08001046{
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001047 struct acpi_hardware_id *hid;
Bob Moore15b8dd52009-06-29 13:39:29 +08001048
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +02001049 if (list_empty(&device->pnp.ids))
1050 return dummy_hid;
1051
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001052 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1053 return hid->id;
1054}
1055EXPORT_SYMBOL(acpi_device_hid);
Bob Moore15b8dd52009-06-29 13:39:29 +08001056
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001057static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1058{
1059 struct acpi_hardware_id *id;
Bob Moore15b8dd52009-06-29 13:39:29 +08001060
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001061 id = kmalloc(sizeof(*id), GFP_KERNEL);
1062 if (!id)
1063 return;
Bob Moore15b8dd52009-06-29 13:39:29 +08001064
Thomas Meyer581de592011-08-06 11:32:56 +02001065 id->id = kstrdup(dev_id, GFP_KERNEL);
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001066 if (!id->id) {
1067 kfree(id);
1068 return;
Bob Moore15b8dd52009-06-29 13:39:29 +08001069 }
1070
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001071 list_add_tail(&id->list, &device->pnp.ids);
Bob Moore15b8dd52009-06-29 13:39:29 +08001072}
1073
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001074/*
1075 * Old IBM workstations have a DSDT bug wherein the SMBus object
1076 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1077 * prefix. Work around this.
1078 */
1079static int acpi_ibm_smbus_match(struct acpi_device *device)
1080{
1081 acpi_handle h_dummy;
1082 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1083 int result;
1084
1085 if (!dmi_name_in_vendors("IBM"))
1086 return -ENODEV;
1087
1088 /* Look for SMBS object */
1089 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1090 if (result)
1091 return result;
1092
1093 if (strcmp("SMBS", path.pointer)) {
1094 result = -ENODEV;
1095 goto out;
1096 }
1097
1098 /* Does it have the necessary (but misnamed) methods? */
1099 result = -ENODEV;
1100 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1101 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1102 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1103 result = 0;
1104out:
1105 kfree(path.pointer);
1106 return result;
1107}
1108
Bjorn Helgaasc7bcb4e2009-09-21 19:29:25 +00001109static void acpi_device_set_id(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110{
Len Brown4be44fc2005-08-05 00:44:28 -04001111 acpi_status status;
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001112 struct acpi_device_info *info;
1113 struct acpica_device_id_list *cid_list;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001114 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115
Bjorn Helgaasc7bcb4e2009-09-21 19:29:25 +00001116 switch (device->device_type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 case ACPI_BUS_TYPE_DEVICE:
Bjorn Helgaas859ac9a2009-09-21 19:29:50 +00001118 if (ACPI_IS_ROOT_DEVICE(device)) {
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001119 acpi_add_id(device, ACPI_SYSTEM_HID);
Bjorn Helgaas859ac9a2009-09-21 19:29:50 +00001120 break;
1121 }
1122
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +00001123 status = acpi_get_object_info(device->handle, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 if (ACPI_FAILURE(status)) {
Harvey Harrison96b2dd12008-03-05 18:24:51 -08001125 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 return;
1127 }
1128
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 if (info->valid & ACPI_VALID_HID)
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001130 acpi_add_id(device, info->hardware_id.string);
1131 if (info->valid & ACPI_VALID_CID) {
Bob Moore15b8dd52009-06-29 13:39:29 +08001132 cid_list = &info->compatible_id_list;
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001133 for (i = 0; i < cid_list->count; i++)
1134 acpi_add_id(device, cid_list->ids[i].string);
1135 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 if (info->valid & ACPI_VALID_ADR) {
1137 device->pnp.bus_address = info->address;
1138 device->flags.bus_address = 1;
1139 }
Zhang Ruiae843332006-12-07 20:57:10 +08001140
Bjorn Helgaasa83893ae2009-10-02 11:03:12 -04001141 kfree(info);
1142
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001143 /*
1144 * Some devices don't reliably have _HIDs & _CIDs, so add
1145 * synthetic HIDs to make sure drivers can find them.
1146 */
Thomas Renningerc3d6de62008-08-01 17:37:55 +02001147 if (acpi_is_video_device(device))
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001148 acpi_add_id(device, ACPI_VIDEO_HID);
Frank Seidel3620f2f2007-12-07 13:20:34 +01001149 else if (ACPI_SUCCESS(acpi_bay_match(device)))
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001150 acpi_add_id(device, ACPI_BAY_HID);
Frank Seidel3620f2f2007-12-07 13:20:34 +01001151 else if (ACPI_SUCCESS(acpi_dock_match(device)))
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001152 acpi_add_id(device, ACPI_DOCK_HID);
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001153 else if (!acpi_ibm_smbus_match(device))
1154 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
Bjorn Helgaasb7b30de2010-03-24 10:44:33 -06001155 else if (!acpi_device_hid(device) &&
1156 ACPI_IS_ROOT_DEVICE(device->parent)) {
1157 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1158 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1159 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1160 }
Zhang Rui54735262007-01-11 02:09:09 -05001161
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162 break;
1163 case ACPI_BUS_TYPE_POWER:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001164 acpi_add_id(device, ACPI_POWER_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 break;
1166 case ACPI_BUS_TYPE_PROCESSOR:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001167 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 case ACPI_BUS_TYPE_THERMAL:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001170 acpi_add_id(device, ACPI_THERMAL_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 break;
1172 case ACPI_BUS_TYPE_POWER_BUTTON:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001173 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 break;
1175 case ACPI_BUS_TYPE_SLEEP_BUTTON:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001176 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 break;
1178 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179}
1180
Bjorn Helgaasbc3b0772009-09-21 19:29:20 +00001181static int acpi_device_set_context(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182{
Bjorn Helgaasbc3b0772009-09-21 19:29:20 +00001183 acpi_status status;
1184
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 /*
1186 * Context
1187 * -------
1188 * Attach this 'struct acpi_device' to the ACPI object. This makes
Bjorn Helgaasbc3b0772009-09-21 19:29:20 +00001189 * resolutions from handle->device very efficient. Fixed hardware
1190 * devices have no handles, so we skip them.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 */
Bjorn Helgaasbc3b0772009-09-21 19:29:20 +00001192 if (!device->handle)
1193 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194
Bjorn Helgaasbc3b0772009-09-21 19:29:20 +00001195 status = acpi_attach_data(device->handle,
1196 acpi_bus_data_handler, device);
1197 if (ACPI_SUCCESS(status))
1198 return 0;
1199
1200 printk(KERN_ERR PREFIX "Error attaching device data\n");
1201 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202}
1203
Len Brown4be44fc2005-08-05 00:44:28 -04001204static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 if (!dev)
Patrick Mocheld550d982006-06-27 00:41:40 -04001207 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208
Li Shaohua96333572006-12-07 20:56:46 +08001209 dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
Patrick Mochel1890a972006-12-07 20:56:31 +08001210 device_release_driver(&dev->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211
1212 if (!rmdevice)
Patrick Mocheld550d982006-06-27 00:41:40 -04001213 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214
Rui Zhang2786f6e2006-12-21 02:21:13 -05001215 /*
1216 * unbind _ADR-Based Devices when hot removal
1217 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218 if (dev->flags.bus_address) {
1219 if ((dev->parent) && (dev->parent->ops.unbind))
1220 dev->parent->ops.unbind(dev);
1221 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1223
Patrick Mocheld550d982006-06-27 00:41:40 -04001224 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225}
1226
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001227static int acpi_add_single_object(struct acpi_device **child,
1228 acpi_handle handle, int type,
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001229 unsigned long long sta,
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001230 struct acpi_bus_ops *ops)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231{
Bjorn Helgaas77c24882009-09-21 19:29:30 +00001232 int result;
1233 struct acpi_device *device;
Bjorn Helgaas29aaefa2009-09-21 19:28:54 +00001234 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235
Burman Yan36bcbec2006-12-19 12:56:11 -08001236 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 if (!device) {
Len Brown64684632006-06-26 23:41:38 -04001238 printk(KERN_ERR PREFIX "Memory allocation error\n");
Patrick Mocheld550d982006-06-27 00:41:40 -04001239 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001242 INIT_LIST_HEAD(&device->pnp.ids);
Bjorn Helgaascaaa6ef2009-09-21 19:29:10 +00001243 device->device_type = type;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244 device->handle = handle;
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001245 device->parent = acpi_bus_get_parent(handle);
Li Shaohuac4168bf2006-12-07 20:56:41 +08001246 device->bus_ops = *ops; /* workround for not call .start */
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001247 STRUCT_TO_INT(device->status) = sta;
Li Shaohuac4168bf2006-12-07 20:56:41 +08001248
Bjorn Helgaasc7bcb4e2009-09-21 19:29:25 +00001249 acpi_device_get_busid(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250
1251 /*
1252 * Flags
1253 * -----
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001254 * Note that we only look for object handles -- cannot evaluate objects
1255 * until we know the device is present and properly initialized.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 */
1257 result = acpi_bus_get_flags(device);
1258 if (result)
1259 goto end;
1260
1261 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 * Initialize Device
1263 * -----------------
1264 * TBD: Synch with Core's enumeration/initialization process.
1265 */
Bjorn Helgaasc7bcb4e2009-09-21 19:29:25 +00001266 acpi_device_set_id(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267
1268 /*
1269 * Power Management
1270 * ----------------
1271 */
1272 if (device->flags.power_manageable) {
1273 result = acpi_bus_get_power_flags(device);
1274 if (result)
1275 goto end;
1276 }
1277
Len Brown4be44fc2005-08-05 00:44:28 -04001278 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 * Wakeup device management
1280 *-----------------------
1281 */
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001282 acpi_bus_get_wakeup_device_flags(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283
1284 /*
1285 * Performance Management
1286 * ----------------------
1287 */
1288 if (device->flags.performance_manageable) {
1289 result = acpi_bus_get_perf_flags(device);
1290 if (result)
1291 goto end;
1292 }
1293
Bjorn Helgaasbc3b0772009-09-21 19:29:20 +00001294 if ((result = acpi_device_set_context(device)))
Len Brownf61f9252009-09-05 13:33:23 -04001295 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +00001297 result = acpi_device_register(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298
1299 /*
Rui Zhang2786f6e2006-12-21 02:21:13 -05001300 * Bind _ADR-Based Devices when hot add
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 */
1302 if (device->flags.bus_address) {
1303 if (device->parent && device->parent->ops.bind)
1304 device->parent->ops.bind(device);
1305 }
1306
Alex Chiang0c526d92009-05-14 08:31:37 -06001307end:
Bjorn Helgaas29aaefa2009-09-21 19:28:54 +00001308 if (!result) {
1309 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1310 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1311 "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1312 (char *) buffer.pointer,
1313 device->parent ? dev_name(&device->parent->dev) :
1314 "(null)"));
1315 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 *child = device;
Bjorn Helgaas29aaefa2009-09-21 19:28:54 +00001317 } else
Hugh Dickins718fb0d2009-08-06 23:18:12 +00001318 acpi_device_release(&device->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319
Patrick Mocheld550d982006-06-27 00:41:40 -04001320 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001323#define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1324 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1325
Rafael J. Wysockibf325f92010-11-25 00:10:44 +01001326static void acpi_bus_add_power_resource(acpi_handle handle)
1327{
1328 struct acpi_bus_ops ops = {
1329 .acpi_op_add = 1,
1330 .acpi_op_start = 1,
1331 };
1332 struct acpi_device *device = NULL;
1333
1334 acpi_bus_get_device(handle, &device);
1335 if (!device)
1336 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1337 ACPI_STA_DEFAULT, &ops);
1338}
1339
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001340static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1341 unsigned long long *sta)
1342{
1343 acpi_status status;
1344 acpi_object_type acpi_type;
1345
1346 status = acpi_get_type(handle, &acpi_type);
1347 if (ACPI_FAILURE(status))
1348 return -ENODEV;
1349
1350 switch (acpi_type) {
1351 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1352 case ACPI_TYPE_DEVICE:
1353 *type = ACPI_BUS_TYPE_DEVICE;
1354 status = acpi_bus_get_status_handle(handle, sta);
1355 if (ACPI_FAILURE(status))
1356 return -ENODEV;
1357 break;
1358 case ACPI_TYPE_PROCESSOR:
1359 *type = ACPI_BUS_TYPE_PROCESSOR;
1360 status = acpi_bus_get_status_handle(handle, sta);
1361 if (ACPI_FAILURE(status))
1362 return -ENODEV;
1363 break;
1364 case ACPI_TYPE_THERMAL:
1365 *type = ACPI_BUS_TYPE_THERMAL;
1366 *sta = ACPI_STA_DEFAULT;
1367 break;
1368 case ACPI_TYPE_POWER:
1369 *type = ACPI_BUS_TYPE_POWER;
1370 *sta = ACPI_STA_DEFAULT;
1371 break;
1372 default:
1373 return -ENODEV;
1374 }
1375
1376 return 0;
1377}
1378
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001379static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1380 void *context, void **return_value)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381{
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001382 struct acpi_bus_ops *ops = context;
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001383 int type;
1384 unsigned long long sta;
Bjorn Helgaase3b87f82009-09-21 19:30:11 +00001385 struct acpi_device *device;
1386 acpi_status status;
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001387 int result;
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001388
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001389 result = acpi_bus_type_and_status(handle, &type, &sta);
1390 if (result)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001391 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001393 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001394 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
Rafael J. Wysocki86e4e202011-01-06 23:40:00 +01001395 struct acpi_device_wakeup wakeup;
1396 acpi_handle temp;
1397
1398 status = acpi_get_handle(handle, "_PRW", &temp);
1399 if (ACPI_SUCCESS(status))
1400 acpi_bus_extract_wakeup_device_power_package(handle,
1401 &wakeup);
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001402 return AE_CTRL_DEPTH;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001403 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404
Bjorn Helgaase3b87f82009-09-21 19:30:11 +00001405 /*
1406 * We may already have an acpi_device from a previous enumeration. If
1407 * so, we needn't add it again, but we may still have to start it.
1408 */
1409 device = NULL;
1410 acpi_bus_get_device(handle, &device);
1411 if (ops->acpi_op_add && !device)
1412 acpi_add_single_object(&device, handle, type, sta, ops);
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001413
Bjorn Helgaase3b87f82009-09-21 19:30:11 +00001414 if (!device)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001415 return AE_CTRL_DEPTH;
1416
1417 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1418 status = acpi_start_single_object(device);
1419 if (ACPI_FAILURE(status))
1420 return AE_CTRL_DEPTH;
1421 }
1422
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001423 if (!*return_value)
1424 *return_value = device;
1425 return AE_OK;
1426}
1427
1428static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1429 struct acpi_device **child)
1430{
1431 acpi_status status;
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001432 void *device = NULL;
1433
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001434 status = acpi_bus_check_add(handle, 0, ops, &device);
1435 if (ACPI_SUCCESS(status))
1436 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
Lin Ming22635762009-11-13 10:06:08 +08001437 acpi_bus_check_add, NULL, ops, &device);
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001438
1439 if (child)
1440 *child = device;
Thomas Renninger77796882010-01-29 17:48:52 +01001441
1442 if (device)
1443 return 0;
1444 else
1445 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447
Thomas Renninger77796882010-01-29 17:48:52 +01001448/*
1449 * acpi_bus_add and acpi_bus_start
1450 *
1451 * scan a given ACPI tree and (probably recently hot-plugged)
1452 * create and add or starts found devices.
1453 *
1454 * If no devices were found -ENODEV is returned which does not
1455 * mean that this is a real error, there just have been no suitable
1456 * ACPI objects in the table trunk from which the kernel could create
1457 * a device and add/start an appropriate driver.
1458 */
1459
Rajesh Shah3fb02732005-04-28 00:25:52 -07001460int
Len Brown4be44fc2005-08-05 00:44:28 -04001461acpi_bus_add(struct acpi_device **child,
1462 struct acpi_device *parent, acpi_handle handle, int type)
Rajesh Shah3fb02732005-04-28 00:25:52 -07001463{
Rajesh Shah3fb02732005-04-28 00:25:52 -07001464 struct acpi_bus_ops ops;
1465
Li Shaohuac4168bf2006-12-07 20:56:41 +08001466 memset(&ops, 0, sizeof(ops));
1467 ops.acpi_op_add = 1;
Rajesh Shah3fb02732005-04-28 00:25:52 -07001468
Thomas Renninger77796882010-01-29 17:48:52 +01001469 return acpi_bus_scan(handle, &ops, child);
Rajesh Shah3fb02732005-04-28 00:25:52 -07001470}
1471EXPORT_SYMBOL(acpi_bus_add);
1472
Len Brown4be44fc2005-08-05 00:44:28 -04001473int acpi_bus_start(struct acpi_device *device)
Rajesh Shah3fb02732005-04-28 00:25:52 -07001474{
Rajesh Shah3fb02732005-04-28 00:25:52 -07001475 struct acpi_bus_ops ops;
Rafael J. Wysockia2100802010-09-16 00:30:43 +02001476 int result;
Rajesh Shah3fb02732005-04-28 00:25:52 -07001477
Thomas Renningerd2f66502010-01-29 17:48:51 +01001478 if (!device)
1479 return -EINVAL;
1480
Bjorn Helgaas8e029bf2009-09-21 19:29:40 +00001481 memset(&ops, 0, sizeof(ops));
1482 ops.acpi_op_start = 1;
Rajesh Shah3fb02732005-04-28 00:25:52 -07001483
Rafael J. Wysockia2100802010-09-16 00:30:43 +02001484 result = acpi_bus_scan(device->handle, &ops, NULL);
1485
Lin Ming3a378982010-12-13 13:36:15 +08001486 acpi_update_all_gpes();
Rafael J. Wysockia2100802010-09-16 00:30:43 +02001487
1488 return result;
Rajesh Shah3fb02732005-04-28 00:25:52 -07001489}
1490EXPORT_SYMBOL(acpi_bus_start);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491
Kristen Accardiceaba662006-02-23 17:56:01 -08001492int acpi_bus_trim(struct acpi_device *start, int rmdevice)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493{
Len Brown4be44fc2005-08-05 00:44:28 -04001494 acpi_status status;
1495 struct acpi_device *parent, *child;
1496 acpi_handle phandle, chandle;
1497 acpi_object_type type;
1498 u32 level = 1;
1499 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500
Len Brown4be44fc2005-08-05 00:44:28 -04001501 parent = start;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 phandle = start->handle;
1503 child = chandle = NULL;
1504
1505 while ((level > 0) && parent && (!err)) {
1506 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
Len Brown4be44fc2005-08-05 00:44:28 -04001507 chandle, &chandle);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508
1509 /*
1510 * If this scope is exhausted then move our way back up.
1511 */
1512 if (ACPI_FAILURE(status)) {
1513 level--;
1514 chandle = phandle;
1515 acpi_get_parent(phandle, &phandle);
1516 child = parent;
1517 parent = parent->parent;
1518
1519 if (level == 0)
1520 err = acpi_bus_remove(child, rmdevice);
1521 else
1522 err = acpi_bus_remove(child, 1);
1523
1524 continue;
1525 }
1526
1527 status = acpi_get_type(chandle, &type);
1528 if (ACPI_FAILURE(status)) {
1529 continue;
1530 }
1531 /*
1532 * If there is a device corresponding to chandle then
1533 * parse it (depth-first).
1534 */
1535 if (acpi_bus_get_device(chandle, &child) == 0) {
1536 level++;
1537 phandle = chandle;
1538 chandle = NULL;
1539 parent = child;
1540 }
1541 continue;
1542 }
1543 return err;
1544}
Kristen Accardiceaba662006-02-23 17:56:01 -08001545EXPORT_SYMBOL_GPL(acpi_bus_trim);
1546
Bjorn Helgaase8b945c2009-09-21 19:28:59 +00001547static int acpi_bus_scan_fixed(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548{
Len Brown4be44fc2005-08-05 00:44:28 -04001549 int result = 0;
1550 struct acpi_device *device = NULL;
Li Shaohuac4168bf2006-12-07 20:56:41 +08001551 struct acpi_bus_ops ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552
Li Shaohuac4168bf2006-12-07 20:56:41 +08001553 memset(&ops, 0, sizeof(ops));
1554 ops.acpi_op_add = 1;
1555 ops.acpi_op_start = 1;
1556
Linus Torvalds1da177e2005-04-16 15:20:36 -07001557 /*
1558 * Enumerate all fixed-feature devices.
1559 */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +03001560 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001561 result = acpi_add_single_object(&device, NULL,
Li Shaohuac4168bf2006-12-07 20:56:41 +08001562 ACPI_BUS_TYPE_POWER_BUTTON,
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001563 ACPI_STA_DEFAULT,
Li Shaohuac4168bf2006-12-07 20:56:41 +08001564 &ops);
Rajesh Shah3fb02732005-04-28 00:25:52 -07001565 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566
Alexey Starikovskiycee324b2007-02-02 19:48:22 +03001567 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001568 result = acpi_add_single_object(&device, NULL,
Li Shaohuac4168bf2006-12-07 20:56:41 +08001569 ACPI_BUS_TYPE_SLEEP_BUTTON,
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001570 ACPI_STA_DEFAULT,
Li Shaohuac4168bf2006-12-07 20:56:41 +08001571 &ops);
Rajesh Shah3fb02732005-04-28 00:25:52 -07001572 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573
Patrick Mocheld550d982006-06-27 00:41:40 -04001574 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575}
1576
Bjorn Helgaase747f272009-03-24 16:49:43 -06001577int __init acpi_scan_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578{
1579 int result;
Rajesh Shah3fb02732005-04-28 00:25:52 -07001580 struct acpi_bus_ops ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581
Li Shaohuac4168bf2006-12-07 20:56:41 +08001582 memset(&ops, 0, sizeof(ops));
1583 ops.acpi_op_add = 1;
1584 ops.acpi_op_start = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585
Patrick Mochel5b327262006-05-10 10:33:00 -04001586 result = bus_register(&acpi_bus_type);
1587 if (result) {
1588 /* We don't want to quit even if we failed to add suspend/resume */
1589 printk(KERN_ERR PREFIX "Could not register bus type\n");
1590 }
1591
Rafael J. Wysocki97d9a9e2010-11-25 00:10:02 +01001592 acpi_power_init();
1593
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001595 * Enumerate devices in the ACPI namespace.
1596 */
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001597 result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
Alexey Starikovskiyc04209a2008-01-01 14:12:55 -05001598
Li Shaohuac4168bf2006-12-07 20:56:41 +08001599 if (!result)
Bjorn Helgaasadc08e22009-09-21 19:29:45 +00001600 result = acpi_bus_scan_fixed();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601
1602 if (result)
1603 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
Rafael J. Wysockia2100802010-09-16 00:30:43 +02001604 else
Lin Ming3a378982010-12-13 13:36:15 +08001605 acpi_update_all_gpes();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606
Patrick Mocheld550d982006-06-27 00:41:40 -04001607 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608}