blob: 02629a810c04d98f6516f572e1883dd2aa09529c [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
Mika Westerberg91e56872012-10-31 22:45:02 +010032/*
33 * The following ACPI IDs are known to be suitable for representing as
34 * platform devices.
35 */
36static const struct acpi_device_id acpi_platform_device_ids[] = {
37
Adrian Hunter142b0072012-11-23 21:11:47 +010038 { "PNP0D40" },
39
Mika Westerberg5e7779f2012-12-07 23:12:01 +010040 /* Haswell LPSS devices */
41 { "INT33C0", 0 },
42 { "INT33C1", 0 },
43 { "INT33C2", 0 },
44 { "INT33C3", 0 },
45 { "INT33C4", 0 },
46 { "INT33C5", 0 },
47 { "INT33C6", 0 },
48 { "INT33C7", 0 },
49
Mika Westerberg91e56872012-10-31 22:45:02 +010050 { }
51};
52
Linus Torvalds1da177e2005-04-16 15:20:36 -070053static LIST_HEAD(acpi_device_list);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +080054static LIST_HEAD(acpi_bus_id_list);
Shaohua Li90905892009-04-07 10:24:29 +080055DEFINE_MUTEX(acpi_device_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056LIST_HEAD(acpi_wakeup_device_list);
57
Zhang Ruie49bd2dd2006-12-08 17:23:43 +080058struct acpi_device_bus_id{
Zhang Ruibb095852007-01-04 15:03:18 +080059 char bus_id[15];
Zhang Ruie49bd2dd2006-12-08 17:23:43 +080060 unsigned int instance_no;
61 struct list_head node;
62};
Thomas Renninger29b71a12007-07-23 14:43:51 +020063
64/*
65 * Creates hid/cid(s) string needed for modalias and uevent
66 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
67 * char *modalias: "acpi:IBM0001:ACPI0001"
68*/
Adrian Bunkb3e572d2007-08-14 23:22:35 +020069static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
70 int size)
71{
Thomas Renninger29b71a12007-07-23 14:43:51 +020072 int len;
Zhang Rui5c9fcb52008-03-20 16:40:32 +080073 int count;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -060074 struct acpi_hardware_id *id;
Thomas Renninger29b71a12007-07-23 14:43:51 +020075
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +020076 if (list_empty(&acpi_dev->pnp.ids))
77 return 0;
78
Zhang Rui5c9fcb52008-03-20 16:40:32 +080079 len = snprintf(modalias, size, "acpi:");
Thomas Renninger29b71a12007-07-23 14:43:51 +020080 size -= len;
81
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -060082 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
83 count = snprintf(&modalias[len], size, "%s:", id->id);
Zhang Rui5c9fcb52008-03-20 16:40:32 +080084 if (count < 0 || count >= size)
85 return -EINVAL;
86 len += count;
87 size -= count;
88 }
89
Thomas Renninger29b71a12007-07-23 14:43:51 +020090 modalias[len] = '\0';
91 return len;
92}
93
94static ssize_t
95acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
96 struct acpi_device *acpi_dev = to_acpi_device(dev);
97 int len;
98
99 /* Device has no HID and no CID or string is >1024 */
100 len = create_modalias(acpi_dev, buf, 1024);
101 if (len <= 0)
102 return 0;
103 buf[len++] = '\n';
104 return len;
105}
106static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
107
Toshi Kanic4753e52012-05-23 20:25:20 -0600108/**
109 * acpi_bus_hot_remove_device: hot-remove a device and its children
110 * @context: struct acpi_eject_event pointer (freed in this func)
111 *
112 * Hot-remove a device and its children. This function frees up the
113 * memory space passed by arg context, so that the caller may call
114 * this function asynchronously through acpi_os_hotplug_execute().
115 */
116void acpi_bus_hot_remove_device(void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117{
Toshi Kanic4753e52012-05-23 20:25:20 -0600118 struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
Yinghai Lu5993c462013-01-11 22:40:41 +0000119 struct acpi_device *device = ej_event->device;
120 acpi_handle handle = device->handle;
Toshi Kanib3c450c2012-10-26 13:38:57 +0200121 acpi_handle temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 struct acpi_object_list arg_list;
123 union acpi_object arg;
124 acpi_status status = AE_OK;
Toshi Kanic4753e52012-05-23 20:25:20 -0600125 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
Zhang Rui26d46862008-04-29 02:35:48 -0400127 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Kay Sievers07944692008-10-30 01:18:59 +0100128 "Hot-removing device %s...\n", dev_name(&device->dev)));
Zhang Rui26d46862008-04-29 02:35:48 -0400129
Rafael J. Wysockiae281792013-01-15 13:23:53 +0100130 if (acpi_bus_trim(device)) {
Lin Ming55ac9a02008-09-28 14:51:56 +0800131 printk(KERN_ERR PREFIX
132 "Removing device failed\n");
Toshi Kanic4753e52012-05-23 20:25:20 -0600133 goto err_out;
Zhang Rui26d46862008-04-29 02:35:48 -0400134 }
135
Toshi Kanib3c450c2012-10-26 13:38:57 +0200136 /* device has been freed */
137 device = NULL;
138
Zhang Rui26d46862008-04-29 02:35:48 -0400139 /* power off device */
140 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
141 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
Lin Ming55ac9a02008-09-28 14:51:56 +0800142 printk(KERN_WARNING PREFIX
143 "Power-off device failed\n");
Zhang Rui26d46862008-04-29 02:35:48 -0400144
Toshi Kanib3c450c2012-10-26 13:38:57 +0200145 if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 arg_list.count = 1;
147 arg_list.pointer = &arg;
148 arg.type = ACPI_TYPE_INTEGER;
149 arg.integer.value = 0;
150 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
151 }
152
153 arg_list.count = 1;
154 arg_list.pointer = &arg;
155 arg.type = ACPI_TYPE_INTEGER;
156 arg.integer.value = 1;
157
158 /*
159 * TBD: _EJD support.
160 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
Toshi Kanic4753e52012-05-23 20:25:20 -0600162 if (ACPI_FAILURE(status)) {
163 if (status != AE_NOT_FOUND)
164 printk(KERN_WARNING PREFIX
165 "Eject device failed\n");
166 goto err_out;
167 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Toshi Kanic4753e52012-05-23 20:25:20 -0600169 kfree(context);
170 return;
171
172err_out:
173 /* Inform firmware the hot-remove operation has completed w/ error */
174 (void) acpi_evaluate_hotplug_ost(handle,
175 ej_event->event, ost_code, NULL);
176 kfree(context);
Zhang Ruic8d72a52009-06-22 11:31:16 +0800177 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178}
Toshi Kani61622ac2012-11-01 14:42:12 +0000179EXPORT_SYMBOL(acpi_bus_hot_remove_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181static ssize_t
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800182acpi_eject_store(struct device *d, struct device_attribute *attr,
183 const char *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184{
Len Brown4be44fc2005-08-05 00:44:28 -0400185 int ret = count;
Len Brown4be44fc2005-08-05 00:44:28 -0400186 acpi_status status;
Len Brown4be44fc2005-08-05 00:44:28 -0400187 acpi_object_type type = 0;
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800188 struct acpi_device *acpi_device = to_acpi_device(d);
Toshi Kanic4753e52012-05-23 20:25:20 -0600189 struct acpi_eject_event *ej_event;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
191 if ((!count) || (buf[0] != '1')) {
192 return -EINVAL;
193 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194#ifndef FORCE_EJECT
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800195 if (acpi_device->driver == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 ret = -ENODEV;
197 goto err;
198 }
199#endif
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800200 status = acpi_get_type(acpi_device->handle, &type);
201 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 ret = -ENODEV;
203 goto err;
204 }
205
Toshi Kanic4753e52012-05-23 20:25:20 -0600206 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
207 if (!ej_event) {
208 ret = -ENOMEM;
209 goto err;
210 }
211
Yinghai Lu5993c462013-01-11 22:40:41 +0000212 ej_event->device = acpi_device;
Toshi Kanic4753e52012-05-23 20:25:20 -0600213 if (acpi_device->flags.eject_pending) {
214 /* event originated from ACPI eject notification */
215 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
216 acpi_device->flags.eject_pending = 0;
217 } else {
218 /* event originated from user */
219 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
Yinghai Lu5993c462013-01-11 22:40:41 +0000220 (void) acpi_evaluate_hotplug_ost(acpi_device->handle,
Toshi Kanic4753e52012-05-23 20:25:20 -0600221 ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
222 }
223
224 acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
Alok N Kataria74523c92008-06-13 12:54:24 -0400225err:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227}
228
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800229static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800231static ssize_t
232acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
233 struct acpi_device *acpi_dev = to_acpi_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Bjorn Helgaasea8d82f2009-09-21 13:35:09 -0600235 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800236}
237static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
238
Lv Zheng923d4a42012-10-30 14:43:26 +0100239static ssize_t acpi_device_uid_show(struct device *dev,
240 struct device_attribute *attr, char *buf)
241{
242 struct acpi_device *acpi_dev = to_acpi_device(dev);
243
244 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
245}
246static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
247
248static ssize_t acpi_device_adr_show(struct device *dev,
249 struct device_attribute *attr, char *buf)
250{
251 struct acpi_device *acpi_dev = to_acpi_device(dev);
252
253 return sprintf(buf, "0x%08x\n",
254 (unsigned int)(acpi_dev->pnp.bus_address));
255}
256static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
257
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800258static ssize_t
259acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
260 struct acpi_device *acpi_dev = to_acpi_device(dev);
261 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
262 int result;
263
264 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
Alex Chiang0c526d92009-05-14 08:31:37 -0600265 if (result)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800266 goto end;
267
268 result = sprintf(buf, "%s\n", (char*)path.pointer);
269 kfree(path.pointer);
Alex Chiang0c526d92009-05-14 08:31:37 -0600270end:
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800271 return result;
272}
273static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
274
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600275/* sysfs file that shows description text from the ACPI _STR method */
276static ssize_t description_show(struct device *dev,
277 struct device_attribute *attr,
278 char *buf) {
279 struct acpi_device *acpi_dev = to_acpi_device(dev);
280 int result;
281
282 if (acpi_dev->pnp.str_obj == NULL)
283 return 0;
284
285 /*
286 * The _STR object contains a Unicode identifier for a device.
287 * We need to convert to utf-8 so it can be displayed.
288 */
289 result = utf16s_to_utf8s(
290 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
291 acpi_dev->pnp.str_obj->buffer.length,
292 UTF16_LITTLE_ENDIAN, buf,
293 PAGE_SIZE);
294
295 buf[result++] = '\n';
296
297 return result;
298}
299static DEVICE_ATTR(description, 0444, description_show, NULL);
300
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100301static ssize_t
302acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
303 char *buf) {
304 struct acpi_device *acpi_dev = to_acpi_device(dev);
305
306 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
307}
308static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
309
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800310static int acpi_device_setup_files(struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311{
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600312 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800313 acpi_status status;
314 acpi_handle temp;
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100315 unsigned long long sun;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800316 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800318 /*
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800319 * Devices gotten from FADT don't have a "path" attribute
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800320 */
Alex Chiang0c526d92009-05-14 08:31:37 -0600321 if (dev->handle) {
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800322 result = device_create_file(&dev->dev, &dev_attr_path);
Alex Chiang0c526d92009-05-14 08:31:37 -0600323 if (result)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800324 goto end;
325 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200327 if (!list_empty(&dev->pnp.ids)) {
328 result = device_create_file(&dev->dev, &dev_attr_hid);
329 if (result)
330 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200332 result = device_create_file(&dev->dev, &dev_attr_modalias);
333 if (result)
334 goto end;
335 }
Thomas Renninger29b71a12007-07-23 14:43:51 +0200336
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600337 /*
338 * If device has _STR, 'description' file is created
339 */
340 status = acpi_get_handle(dev->handle, "_STR", &temp);
341 if (ACPI_SUCCESS(status)) {
342 status = acpi_evaluate_object(dev->handle, "_STR",
343 NULL, &buffer);
344 if (ACPI_FAILURE(status))
345 buffer.pointer = NULL;
346 dev->pnp.str_obj = buffer.pointer;
347 result = device_create_file(&dev->dev, &dev_attr_description);
348 if (result)
349 goto end;
350 }
351
Lv Zheng923d4a42012-10-30 14:43:26 +0100352 if (dev->flags.bus_address)
353 result = device_create_file(&dev->dev, &dev_attr_adr);
354 if (dev->pnp.unique_id)
355 result = device_create_file(&dev->dev, &dev_attr_uid);
356
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100357 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
358 if (ACPI_SUCCESS(status)) {
359 dev->pnp.sun = (unsigned long)sun;
360 result = device_create_file(&dev->dev, &dev_attr_sun);
361 if (result)
362 goto end;
363 } else {
364 dev->pnp.sun = (unsigned long)-1;
365 }
366
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800367 /*
368 * If device has _EJ0, 'eject' file is created that is used to trigger
369 * hot-removal function from userland.
370 */
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800371 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
372 if (ACPI_SUCCESS(status))
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800373 result = device_create_file(&dev->dev, &dev_attr_eject);
Alex Chiang0c526d92009-05-14 08:31:37 -0600374end:
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800375 return result;
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800376}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800378static void acpi_device_remove_files(struct acpi_device *dev)
379{
380 acpi_status status;
381 acpi_handle temp;
382
383 /*
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600384 * If device has _STR, remove 'description' file
385 */
386 status = acpi_get_handle(dev->handle, "_STR", &temp);
387 if (ACPI_SUCCESS(status)) {
388 kfree(dev->pnp.str_obj);
389 device_remove_file(&dev->dev, &dev_attr_description);
390 }
391 /*
392 * If device has _EJ0, remove 'eject' file.
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800393 */
394 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
395 if (ACPI_SUCCESS(status))
396 device_remove_file(&dev->dev, &dev_attr_eject);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800397
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100398 status = acpi_get_handle(dev->handle, "_SUN", &temp);
399 if (ACPI_SUCCESS(status))
400 device_remove_file(&dev->dev, &dev_attr_sun);
401
Lv Zheng923d4a42012-10-30 14:43:26 +0100402 if (dev->pnp.unique_id)
403 device_remove_file(&dev->dev, &dev_attr_uid);
404 if (dev->flags.bus_address)
405 device_remove_file(&dev->dev, &dev_attr_adr);
Bjorn Helgaas1131b932009-09-21 13:35:29 -0600406 device_remove_file(&dev->dev, &dev_attr_modalias);
407 device_remove_file(&dev->dev, &dev_attr_hid);
Alex Chiang0c526d92009-05-14 08:31:37 -0600408 if (dev->handle)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800409 device_remove_file(&dev->dev, &dev_attr_path);
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800410}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411/* --------------------------------------------------------------------------
Zhang Rui9e89dde2006-12-07 20:56:16 +0800412 ACPI Bus operations
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 -------------------------------------------------------------------------- */
Thomas Renninger29b71a12007-07-23 14:43:51 +0200414
Mika Westerbergcf761af2012-10-31 22:44:41 +0100415static const struct acpi_device_id *__acpi_match_device(
416 struct acpi_device *device, const struct acpi_device_id *ids)
Thomas Renninger29b71a12007-07-23 14:43:51 +0200417{
418 const struct acpi_device_id *id;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600419 struct acpi_hardware_id *hwid;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200420
Zhao Yakui39a0ad82008-08-11 13:40:22 +0800421 /*
422 * If the device is not present, it is unnecessary to load device
423 * driver for it.
424 */
425 if (!device->status.present)
Mika Westerbergcf761af2012-10-31 22:44:41 +0100426 return NULL;
Zhao Yakui39a0ad82008-08-11 13:40:22 +0800427
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600428 for (id = ids; id->id[0]; id++)
429 list_for_each_entry(hwid, &device->pnp.ids, list)
430 if (!strcmp((char *) id->id, hwid->id))
Mika Westerbergcf761af2012-10-31 22:44:41 +0100431 return id;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200432
Mika Westerbergcf761af2012-10-31 22:44:41 +0100433 return NULL;
434}
435
436/**
437 * acpi_match_device - Match a struct device against a given list of ACPI IDs
438 * @ids: Array of struct acpi_device_id object to match against.
439 * @dev: The device structure to match.
440 *
441 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
442 * object for that handle and use that object to match against a given list of
443 * device IDs.
444 *
445 * Return a pointer to the first matching ID on success or %NULL on failure.
446 */
447const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
448 const struct device *dev)
449{
450 struct acpi_device *adev;
451
Rafael J. Wysocki95f8a082012-11-21 00:21:50 +0100452 if (!ids || !ACPI_HANDLE(dev)
453 || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
Mika Westerbergcf761af2012-10-31 22:44:41 +0100454 return NULL;
455
456 return __acpi_match_device(adev, ids);
457}
458EXPORT_SYMBOL_GPL(acpi_match_device);
459
460int acpi_match_device_ids(struct acpi_device *device,
461 const struct acpi_device_id *ids)
462{
463 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200464}
465EXPORT_SYMBOL(acpi_match_device_ids);
466
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600467static void acpi_free_ids(struct acpi_device *device)
468{
469 struct acpi_hardware_id *id, *tmp;
470
471 list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
472 kfree(id->id);
473 kfree(id);
474 }
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100475 kfree(device->pnp.unique_id);
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600476}
477
Patrick Mochel1890a972006-12-07 20:56:31 +0800478static void acpi_device_release(struct device *dev)
479{
480 struct acpi_device *acpi_dev = to_acpi_device(dev);
481
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600482 acpi_free_ids(acpi_dev);
Patrick Mochel1890a972006-12-07 20:56:31 +0800483 kfree(acpi_dev);
484}
485
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800486static int acpi_bus_match(struct device *dev, struct device_driver *drv)
487{
488 struct acpi_device *acpi_dev = to_acpi_device(dev);
489 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
490
Rafael J. Wysocki209d3b12012-12-21 00:36:48 +0100491 return acpi_dev->flags.match_driver
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +0100492 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800493}
494
Kay Sievers7eff2e72007-08-14 15:15:12 +0200495static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800496{
497 struct acpi_device *acpi_dev = to_acpi_device(dev);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200498 int len;
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800499
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200500 if (list_empty(&acpi_dev->pnp.ids))
501 return 0;
502
Kay Sievers7eff2e72007-08-14 15:15:12 +0200503 if (add_uevent_var(env, "MODALIAS="))
504 return -ENOMEM;
505 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
506 sizeof(env->buf) - env->buflen);
507 if (len >= (sizeof(env->buf) - env->buflen))
508 return -ENOMEM;
509 env->buflen += len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 return 0;
511}
512
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000513static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
514{
515 struct acpi_device *device = data;
516
517 device->driver->ops.notify(device, event);
518}
519
520static acpi_status acpi_device_notify_fixed(void *data)
521{
522 struct acpi_device *device = data;
523
Bjorn Helgaas53de5352009-08-31 22:32:20 +0000524 /* Fixed hardware devices have no handles */
525 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000526 return AE_OK;
527}
528
529static int acpi_device_install_notify_handler(struct acpi_device *device)
530{
531 acpi_status status;
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000532
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000533 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000534 status =
535 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
536 acpi_device_notify_fixed,
537 device);
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000538 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000539 status =
540 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
541 acpi_device_notify_fixed,
542 device);
543 else
544 status = acpi_install_notify_handler(device->handle,
545 ACPI_DEVICE_NOTIFY,
546 acpi_device_notify,
547 device);
548
549 if (ACPI_FAILURE(status))
550 return -EINVAL;
551 return 0;
552}
553
554static void acpi_device_remove_notify_handler(struct acpi_device *device)
555{
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000556 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000557 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
558 acpi_device_notify_fixed);
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000559 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000560 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
561 acpi_device_notify_fixed);
562 else
563 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
564 acpi_device_notify);
565}
566
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800567static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800568static int acpi_device_probe(struct device * dev)
Zhang Rui9e89dde2006-12-07 20:56:16 +0800569{
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800570 struct acpi_device *acpi_dev = to_acpi_device(dev);
571 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
572 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800574 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
575 if (!ret) {
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000576 if (acpi_drv->ops.notify) {
577 ret = acpi_device_install_notify_handler(acpi_dev);
578 if (ret) {
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000579 if (acpi_drv->ops.remove)
580 acpi_drv->ops.remove(acpi_dev,
581 acpi_dev->removal_type);
582 return ret;
583 }
584 }
585
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800586 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
587 "Found driver [%s] for device [%s]\n",
588 acpi_drv->name, acpi_dev->pnp.bus_id));
589 get_device(dev);
Zhang Rui9e89dde2006-12-07 20:56:16 +0800590 }
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800591 return ret;
592}
593
594static int acpi_device_remove(struct device * dev)
595{
596 struct acpi_device *acpi_dev = to_acpi_device(dev);
597 struct acpi_driver *acpi_drv = acpi_dev->driver;
598
599 if (acpi_drv) {
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000600 if (acpi_drv->ops.notify)
601 acpi_device_remove_notify_handler(acpi_dev);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800602 if (acpi_drv->ops.remove)
Li Shaohua96333572006-12-07 20:56:46 +0800603 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800604 }
605 acpi_dev->driver = NULL;
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700606 acpi_dev->driver_data = NULL;
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800607
608 put_device(dev);
Zhang Rui9e89dde2006-12-07 20:56:16 +0800609 return 0;
610}
611
David Brownell55955aa2007-05-08 00:28:35 -0700612struct bus_type acpi_bus_type = {
Zhang Rui9e89dde2006-12-07 20:56:16 +0800613 .name = "acpi",
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800614 .match = acpi_bus_match,
615 .probe = acpi_device_probe,
616 .remove = acpi_device_remove,
617 .uevent = acpi_device_uevent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618};
619
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +0000620static int acpi_device_register(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621{
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800622 int result;
623 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
624 int found = 0;
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +0000625
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100626 if (device->handle) {
627 acpi_status status;
628
629 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
630 device);
631 if (ACPI_FAILURE(status)) {
632 acpi_handle_err(device->handle,
633 "Unable to attach device data\n");
634 return -ENODEV;
635 }
636 }
637
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 /*
639 * Linkage
640 * -------
641 * Link this device to its parent and siblings.
642 */
643 INIT_LIST_HEAD(&device->children);
644 INIT_LIST_HEAD(&device->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 INIT_LIST_HEAD(&device->wakeup_list);
Lan Tianyu1033f902012-08-17 14:44:09 +0800646 INIT_LIST_HEAD(&device->physical_node_list);
647 mutex_init(&device->physical_node_lock);
Rafael J. Wysockibc9b6402013-01-17 14:11:05 +0100648 INIT_LIST_HEAD(&device->power_dependent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800650 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
651 if (!new_bus_id) {
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100652 pr_err(PREFIX "Memory allocation error\n");
653 result = -ENOMEM;
654 goto err_detach;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800655 }
656
Shaohua Li90905892009-04-07 10:24:29 +0800657 mutex_lock(&acpi_device_lock);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800658 /*
659 * Find suitable bus_id and instance number in acpi_bus_id_list
660 * If failed, create one and link it into acpi_bus_id_list
661 */
662 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
Bjorn Helgaas1131b932009-09-21 13:35:29 -0600663 if (!strcmp(acpi_device_bus_id->bus_id,
664 acpi_device_hid(device))) {
665 acpi_device_bus_id->instance_no++;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800666 found = 1;
667 kfree(new_bus_id);
668 break;
669 }
670 }
Alex Chiang0c526d92009-05-14 08:31:37 -0600671 if (!found) {
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800672 acpi_device_bus_id = new_bus_id;
Bjorn Helgaas1131b932009-09-21 13:35:29 -0600673 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800674 acpi_device_bus_id->instance_no = 0;
675 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
676 }
Kay Sievers07944692008-10-30 01:18:59 +0100677 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 +0800678
Len Brown33b57152008-12-15 22:09:26 -0500679 if (device->parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 list_add_tail(&device->node, &device->parent->children);
Len Brown33b57152008-12-15 22:09:26 -0500681
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 if (device->wakeup.flags.valid)
683 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
Shaohua Li90905892009-04-07 10:24:29 +0800684 mutex_unlock(&acpi_device_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685
Patrick Mochel1890a972006-12-07 20:56:31 +0800686 if (device->parent)
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +0000687 device->dev.parent = &device->parent->dev;
Patrick Mochel1890a972006-12-07 20:56:31 +0800688 device->dev.bus = &acpi_bus_type;
Patrick Mochel1890a972006-12-07 20:56:31 +0800689 device->dev.release = &acpi_device_release;
Alex Chiang8b12b922009-05-14 08:31:32 -0600690 result = device_register(&device->dev);
Alex Chiang0c526d92009-05-14 08:31:37 -0600691 if (result) {
Alex Chiang8b12b922009-05-14 08:31:32 -0600692 dev_err(&device->dev, "Error registering device\n");
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100693 goto err;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800694 }
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800695
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800696 result = acpi_device_setup_files(device);
Alex Chiang0c526d92009-05-14 08:31:37 -0600697 if (result)
Kay Sievers07944692008-10-30 01:18:59 +0100698 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
699 dev_name(&device->dev));
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800700
Li Shaohua96333572006-12-07 20:56:46 +0800701 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800702 return 0;
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100703
704 err:
Shaohua Li90905892009-04-07 10:24:29 +0800705 mutex_lock(&acpi_device_lock);
Len Brown33b57152008-12-15 22:09:26 -0500706 if (device->parent)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800707 list_del(&device->node);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800708 list_del(&device->wakeup_list);
Shaohua Li90905892009-04-07 10:24:29 +0800709 mutex_unlock(&acpi_device_lock);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100710
711 err_detach:
712 acpi_detach_data(device->handle, acpi_bus_data_handler);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800713 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714}
715
Rafael J. Wysockib17b5372013-01-15 13:23:44 +0100716static void acpi_device_unregister(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717{
Shaohua Li90905892009-04-07 10:24:29 +0800718 mutex_lock(&acpi_device_lock);
Len Brown33b57152008-12-15 22:09:26 -0500719 if (device->parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 list_del(&device->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721
722 list_del(&device->wakeup_list);
Shaohua Li90905892009-04-07 10:24:29 +0800723 mutex_unlock(&acpi_device_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724
725 acpi_detach_data(device->handle, acpi_bus_data_handler);
Patrick Mochel1890a972006-12-07 20:56:31 +0800726
Rafael J. Wysockibc9b6402013-01-17 14:11:05 +0100727 acpi_power_add_remove_device(device, false);
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800728 acpi_device_remove_files(device);
Patrick Mochel1890a972006-12-07 20:56:31 +0800729 device_unregister(&device->dev);
Rafael J. Wysockibc9b6402013-01-17 14:11:05 +0100730 /*
731 * Drop the reference counts of all power resources the device depends
732 * on and turn off the ones that have no more references.
733 */
734 acpi_power_transition(device, ACPI_STATE_D3_COLD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735}
736
Zhang Rui9e89dde2006-12-07 20:56:16 +0800737/* --------------------------------------------------------------------------
738 Driver Management
739 -------------------------------------------------------------------------- */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740/**
Randy Dunlapd758a8f2006-01-06 01:31:00 -0500741 * acpi_bus_driver_init - add a device to a driver
742 * @device: the device to add and initialize
743 * @driver: driver for the device
744 *
Alex Chiang0c526d92009-05-14 08:31:37 -0600745 * Used to initialize a device via its device driver. Called whenever a
Patrick Mochel1890a972006-12-07 20:56:31 +0800746 * driver is bound to a device. Invokes the driver's add() ops.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 */
748static int
Len Brown4be44fc2005-08-05 00:44:28 -0400749acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750{
Len Brown4be44fc2005-08-05 00:44:28 -0400751 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 if (!device || !driver)
Patrick Mocheld550d982006-06-27 00:41:40 -0400754 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755
756 if (!driver->ops.add)
Patrick Mocheld550d982006-06-27 00:41:40 -0400757 return -ENOSYS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758
759 result = driver->ops.add(device);
760 if (result) {
761 device->driver = NULL;
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700762 device->driver_data = NULL;
Patrick Mocheld550d982006-06-27 00:41:40 -0400763 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 }
765
766 device->driver = driver;
767
768 /*
769 * TBD - Configuration Management: Assign resources to device based
770 * upon possible configuration and currently allocated resources.
771 */
772
Len Brown4be44fc2005-08-05 00:44:28 -0400773 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
774 "Driver successfully bound to device\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400775 return 0;
Rajesh Shah3fb02732005-04-28 00:25:52 -0700776}
777
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778/**
Randy Dunlapd758a8f2006-01-06 01:31:00 -0500779 * acpi_bus_register_driver - register a driver with the ACPI bus
780 * @driver: driver being registered
781 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 * Registers a driver with the ACPI bus. Searches the namespace for all
Bjorn Helgaas9d9f7492006-03-28 17:04:00 -0500783 * devices that match the driver's criteria and binds. Returns zero for
784 * success or a negative error status for failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 */
Len Brown4be44fc2005-08-05 00:44:28 -0400786int acpi_bus_register_driver(struct acpi_driver *driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787{
Patrick Mochel1890a972006-12-07 20:56:31 +0800788 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789
790 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400791 return -ENODEV;
Patrick Mochel1890a972006-12-07 20:56:31 +0800792 driver->drv.name = driver->name;
793 driver->drv.bus = &acpi_bus_type;
794 driver->drv.owner = driver->owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795
Patrick Mochel1890a972006-12-07 20:56:31 +0800796 ret = driver_register(&driver->drv);
797 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799
Len Brown4be44fc2005-08-05 00:44:28 -0400800EXPORT_SYMBOL(acpi_bus_register_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801
802/**
Randy Dunlapd758a8f2006-01-06 01:31:00 -0500803 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
804 * @driver: driver to unregister
805 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 * Unregisters a driver with the ACPI bus. Searches the namespace for all
807 * devices that match the driver's criteria and unbinds.
808 */
Bjorn Helgaas06ea8e082006-04-27 05:25:00 -0400809void acpi_bus_unregister_driver(struct acpi_driver *driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810{
Patrick Mochel1890a972006-12-07 20:56:31 +0800811 driver_unregister(&driver->drv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812}
Len Brown4be44fc2005-08-05 00:44:28 -0400813
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814EXPORT_SYMBOL(acpi_bus_unregister_driver);
815
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816/* --------------------------------------------------------------------------
817 Device Enumeration
818 -------------------------------------------------------------------------- */
Bjorn Helgaas5c478f42009-09-21 19:29:35 +0000819static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
820{
821 acpi_status status;
822 int ret;
823 struct acpi_device *device;
824
825 /*
826 * Fixed hardware devices do not appear in the namespace and do not
827 * have handles, but we fabricate acpi_devices for them, so we have
828 * to deal with them specially.
829 */
830 if (handle == NULL)
831 return acpi_root;
832
833 do {
834 status = acpi_get_parent(handle, &handle);
835 if (status == AE_NULL_ENTRY)
836 return NULL;
837 if (ACPI_FAILURE(status))
838 return acpi_root;
839
840 ret = acpi_bus_get_device(handle, &device);
841 if (ret == 0)
842 return device;
843 } while (1);
844}
845
Len Brownc8f7a622006-07-09 17:22:28 -0400846acpi_status
847acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
848{
849 acpi_status status;
850 acpi_handle tmp;
851 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
852 union acpi_object *obj;
853
854 status = acpi_get_handle(handle, "_EJD", &tmp);
855 if (ACPI_FAILURE(status))
856 return status;
857
858 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
859 if (ACPI_SUCCESS(status)) {
860 obj = buffer.pointer;
Holger Macht3b5fee52008-02-14 13:40:34 +0100861 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
862 ejd);
Len Brownc8f7a622006-07-09 17:22:28 -0400863 kfree(buffer.pointer);
864 }
865 return status;
866}
867EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
868
Bob Moore8e4319c2009-06-29 13:43:27 +0800869void acpi_bus_data_handler(acpi_handle handle, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870{
871
872 /* TBD */
873
874 return;
875}
876
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877static acpi_status
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100878acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
879 struct acpi_device_wakeup *wakeup)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880{
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100881 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
882 union acpi_object *package = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 union acpi_object *element = NULL;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100884 acpi_status status;
885 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100887 if (!wakeup)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 return AE_BAD_PARAMETER;
889
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100890 /* _PRW */
891 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
892 if (ACPI_FAILURE(status)) {
893 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
894 return status;
895 }
896
897 package = (union acpi_object *)buffer.pointer;
898
899 if (!package || (package->package.count < 2)) {
900 status = AE_BAD_DATA;
901 goto out;
902 }
903
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904 element = &(package->package.elements[0]);
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100905 if (!element) {
906 status = AE_BAD_DATA;
907 goto out;
908 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 if (element->type == ACPI_TYPE_PACKAGE) {
910 if ((element->package.count < 2) ||
911 (element->package.elements[0].type !=
912 ACPI_TYPE_LOCAL_REFERENCE)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100913 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
914 status = AE_BAD_DATA;
915 goto out;
916 }
917 wakeup->gpe_device =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 element->package.elements[0].reference.handle;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100919 wakeup->gpe_number =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 (u32) element->package.elements[1].integer.value;
921 } else if (element->type == ACPI_TYPE_INTEGER) {
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100922 wakeup->gpe_device = NULL;
923 wakeup->gpe_number = element->integer.value;
924 } else {
925 status = AE_BAD_DATA;
926 goto out;
927 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928
929 element = &(package->package.elements[1]);
930 if (element->type != ACPI_TYPE_INTEGER) {
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100931 status = AE_BAD_DATA;
932 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 }
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100934 wakeup->sleep_state = element->integer.value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935
936 if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100937 status = AE_NO_MEMORY;
938 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 }
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100940 wakeup->resources.count = package->package.count - 2;
941 for (i = 0; i < wakeup->resources.count; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 element = &(package->package.elements[i + 2]);
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100943 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
944 status = AE_BAD_DATA;
945 goto out;
946 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100948 wakeup->resources.handles[i] = element->reference.handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 }
950
Lin Mingbba63a22010-12-13 13:39:17 +0800951 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
Rafael J. Wysocki98746472010-07-08 00:43:36 +0200952
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100953 out:
954 kfree(buffer.pointer);
955
956 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700957}
958
Rafael J. Wysockif5177092010-02-17 23:41:49 +0100959static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960{
Thomas Renninger29b71a12007-07-23 14:43:51 +0200961 struct acpi_device_id button_device_ids[] = {
Thomas Renninger29b71a12007-07-23 14:43:51 +0200962 {"PNP0C0C", 0},
Zhang Ruib7e38302012-12-04 23:23:16 +0100963 {"PNP0C0D", 0},
Thomas Renninger29b71a12007-07-23 14:43:51 +0200964 {"PNP0C0E", 0},
965 {"", 0},
966 };
Rafael J. Wysockif5177092010-02-17 23:41:49 +0100967 acpi_status status;
968 acpi_event_status event_status;
969
Rafael J. Wysockib67ea762010-02-17 23:44:09 +0100970 device->wakeup.flags.notifier_present = 0;
Rafael J. Wysockif5177092010-02-17 23:41:49 +0100971
972 /* Power button, Lid switch always enable wakeup */
973 if (!acpi_match_device_ids(device, button_device_ids)) {
974 device->wakeup.flags.run_wake = 1;
Zhang Ruib7e38302012-12-04 23:23:16 +0100975 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
976 /* Do not use Lid/sleep button for S5 wakeup */
977 if (device->wakeup.sleep_state == ACPI_STATE_S5)
978 device->wakeup.sleep_state = ACPI_STATE_S4;
979 }
Rafael J. Wysockif2b56bc2011-01-06 23:34:22 +0100980 device_set_wakeup_capable(&device->dev, true);
Rafael J. Wysockif5177092010-02-17 23:41:49 +0100981 return;
982 }
983
Rafael J. Wysockie8e18c92010-07-08 00:42:51 +0200984 status = acpi_get_gpe_status(device->wakeup.gpe_device,
985 device->wakeup.gpe_number,
986 &event_status);
Rafael J. Wysockif5177092010-02-17 23:41:49 +0100987 if (status == AE_OK)
988 device->wakeup.flags.run_wake =
989 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
990}
991
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +0100992static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
Rafael J. Wysockif5177092010-02-17 23:41:49 +0100993{
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +0100994 acpi_handle temp;
Rafael J. Wysockif5177092010-02-17 23:41:49 +0100995 acpi_status status = 0;
Rafael J. Wysockif5177092010-02-17 23:41:49 +0100996 int psw_error;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200997
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +0100998 /* Presence of _PRW indicates wake capable */
999 status = acpi_get_handle(device->handle, "_PRW", &temp);
1000 if (ACPI_FAILURE(status))
1001 return;
1002
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001003 status = acpi_bus_extract_wakeup_device_power_package(device->handle,
1004 &device->wakeup);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 if (ACPI_FAILURE(status)) {
1006 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001007 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 }
1009
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 device->wakeup.flags.valid = 1;
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +02001011 device->wakeup.prepare_count = 0;
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001012 acpi_bus_set_run_wake_flags(device);
Zhao Yakui729b2bd2008-03-19 13:26:54 +08001013 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1014 * system for the ACPI device with the _PRW object.
1015 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1016 * So it is necessary to call _DSW object first. Only when it is not
1017 * present will the _PSW object used.
1018 */
Rafael J. Wysocki77e76602008-07-07 03:33:34 +02001019 psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
1020 if (psw_error)
1021 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1022 "error in _DSW or _PSW evaluation\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023}
1024
Rafael J. Wysockibf325f92010-11-25 00:10:44 +01001025static void acpi_bus_add_power_resource(acpi_handle handle);
1026
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001027static void acpi_bus_get_power_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028{
Zhang Rui9e89dde2006-12-07 20:56:16 +08001029 acpi_status status = 0;
1030 acpi_handle handle = NULL;
1031 u32 i = 0;
1032
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001033 /* Power resources cannot be power manageable. */
1034 if (device->device_type == ACPI_BUS_TYPE_POWER)
1035 return;
1036
1037 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1038 status = acpi_get_handle(device->handle, "_PS0", &handle);
1039 if (ACPI_FAILURE(status)) {
1040 status = acpi_get_handle(device->handle, "_PR0", &handle);
1041 if (ACPI_FAILURE(status))
1042 return;
1043 }
1044
1045 device->flags.power_manageable = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046
1047 /*
Zhang Rui9e89dde2006-12-07 20:56:16 +08001048 * Power Management Flags
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 */
Zhang Rui9e89dde2006-12-07 20:56:16 +08001050 status = acpi_get_handle(device->handle, "_PSC", &handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 if (ACPI_SUCCESS(status))
Zhang Rui9e89dde2006-12-07 20:56:16 +08001052 device->power.flags.explicit_get = 1;
1053 status = acpi_get_handle(device->handle, "_IRC", &handle);
1054 if (ACPI_SUCCESS(status))
1055 device->power.flags.inrush_current = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056
1057 /*
Zhang Rui9e89dde2006-12-07 20:56:16 +08001058 * Enumerate supported power management states
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 */
Lin Ming1cc0c992012-04-23 09:03:49 +08001060 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
Zhang Rui9e89dde2006-12-07 20:56:16 +08001061 struct acpi_device_power_state *ps = &device->power.states[i];
1062 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063
Zhang Rui9e89dde2006-12-07 20:56:16 +08001064 /* Evaluate "_PRx" to se if power resources are referenced */
1065 acpi_evaluate_reference(device->handle, object_name, NULL,
1066 &ps->resources);
1067 if (ps->resources.count) {
Rafael J. Wysockibf325f92010-11-25 00:10:44 +01001068 int j;
1069
Zhang Rui9e89dde2006-12-07 20:56:16 +08001070 device->power.flags.power_resources = 1;
Rafael J. Wysockibf325f92010-11-25 00:10:44 +01001071 for (j = 0; j < ps->resources.count; j++)
1072 acpi_bus_add_power_resource(ps->resources.handles[j]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074
Zhang Rui9e89dde2006-12-07 20:56:16 +08001075 /* Evaluate "_PSx" to see if we can do explicit sets */
1076 object_name[2] = 'S';
1077 status = acpi_get_handle(device->handle, object_name, &handle);
Alex He37239972012-02-21 16:58:10 +08001078 if (ACPI_SUCCESS(status))
Zhang Rui9e89dde2006-12-07 20:56:16 +08001079 ps->flags.explicit_set = 1;
Zhang Rui9e89dde2006-12-07 20:56:16 +08001080
Lin Ming1cc0c992012-04-23 09:03:49 +08001081 /*
1082 * State is valid if there are means to put the device into it.
1083 * D3hot is only valid if _PR3 present.
1084 */
1085 if (ps->resources.count ||
Aaron Lu1399dfc2012-11-21 23:33:40 +01001086 (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) {
Zhang Rui9e89dde2006-12-07 20:56:16 +08001087 ps->flags.valid = 1;
Aaron Lu1399dfc2012-11-21 23:33:40 +01001088 ps->flags.os_accessible = 1;
1089 }
Zhang Rui9e89dde2006-12-07 20:56:16 +08001090
1091 ps->power = -1; /* Unknown - driver assigned */
1092 ps->latency = -1; /* Unknown - driver assigned */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094
Zhang Rui9e89dde2006-12-07 20:56:16 +08001095 /* Set defaults for D0 and D3 states (always valid) */
1096 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1097 device->power.states[ACPI_STATE_D0].power = 100;
1098 device->power.states[ACPI_STATE_D3].flags.valid = 1;
1099 device->power.states[ACPI_STATE_D3].power = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100
Rafael J. Wysocki5c7dd712012-05-18 00:39:35 +02001101 /* Set D3cold's explicit_set flag if _PS3 exists. */
1102 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1103 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1104
Aaron Lu1399dfc2012-11-21 23:33:40 +01001105 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1106 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1107 device->power.flags.power_resources)
1108 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1109
Rafael J. Wysockiade3e7f2010-11-25 00:08:36 +01001110 acpi_bus_init_power(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111}
1112
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001113static void acpi_bus_get_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114{
Len Brown4be44fc2005-08-05 00:44:28 -04001115 acpi_status status = AE_OK;
1116 acpi_handle temp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118 /* Presence of _STA indicates 'dynamic_status' */
1119 status = acpi_get_handle(device->handle, "_STA", &temp);
1120 if (ACPI_SUCCESS(status))
1121 device->flags.dynamic_status = 1;
1122
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 /* Presence of _RMV indicates 'removable' */
1124 status = acpi_get_handle(device->handle, "_RMV", &temp);
1125 if (ACPI_SUCCESS(status))
1126 device->flags.removable = 1;
1127
1128 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1129 status = acpi_get_handle(device->handle, "_EJD", &temp);
1130 if (ACPI_SUCCESS(status))
1131 device->flags.ejectable = 1;
1132 else {
1133 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1134 if (ACPI_SUCCESS(status))
1135 device->flags.ejectable = 1;
1136 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137}
1138
Bjorn Helgaasc7bcb4e2009-09-21 19:29:25 +00001139static void acpi_device_get_busid(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140{
Len Brown4be44fc2005-08-05 00:44:28 -04001141 char bus_id[5] = { '?', 0 };
1142 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1143 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144
1145 /*
1146 * Bus ID
1147 * ------
1148 * The device's Bus ID is simply the object name.
1149 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1150 */
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001151 if (ACPI_IS_ROOT_DEVICE(device)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 strcpy(device->pnp.bus_id, "ACPI");
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001153 return;
1154 }
1155
1156 switch (device->device_type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 case ACPI_BUS_TYPE_POWER_BUTTON:
1158 strcpy(device->pnp.bus_id, "PWRF");
1159 break;
1160 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1161 strcpy(device->pnp.bus_id, "SLPF");
1162 break;
1163 default:
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +00001164 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 /* Clean up trailing underscores (if any) */
1166 for (i = 3; i > 1; i--) {
1167 if (bus_id[i] == '_')
1168 bus_id[i] = '\0';
1169 else
1170 break;
1171 }
1172 strcpy(device->pnp.bus_id, bus_id);
1173 break;
1174 }
1175}
1176
Zhang Rui54735262007-01-11 02:09:09 -05001177/*
1178 * acpi_bay_match - see if a device is an ejectable driver bay
1179 *
1180 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1181 * then we can safely call it an ejectable drive bay
1182 */
1183static int acpi_bay_match(struct acpi_device *device){
1184 acpi_status status;
1185 acpi_handle handle;
1186 acpi_handle tmp;
1187 acpi_handle phandle;
1188
1189 handle = device->handle;
1190
1191 status = acpi_get_handle(handle, "_EJ0", &tmp);
1192 if (ACPI_FAILURE(status))
1193 return -ENODEV;
1194
1195 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1196 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1197 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1198 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1199 return 0;
1200
1201 if (acpi_get_parent(handle, &phandle))
1202 return -ENODEV;
1203
1204 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1205 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1206 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1207 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1208 return 0;
1209
1210 return -ENODEV;
1211}
1212
Frank Seidel3620f2f2007-12-07 13:20:34 +01001213/*
1214 * acpi_dock_match - see if a device has a _DCK method
1215 */
1216static int acpi_dock_match(struct acpi_device *device)
1217{
1218 acpi_handle tmp;
1219 return acpi_get_handle(device->handle, "_DCK", &tmp);
1220}
1221
Thomas Renninger620e1122010-10-01 10:54:00 +02001222const char *acpi_device_hid(struct acpi_device *device)
Bob Moore15b8dd52009-06-29 13:39:29 +08001223{
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001224 struct acpi_hardware_id *hid;
Bob Moore15b8dd52009-06-29 13:39:29 +08001225
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +02001226 if (list_empty(&device->pnp.ids))
1227 return dummy_hid;
1228
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001229 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1230 return hid->id;
1231}
1232EXPORT_SYMBOL(acpi_device_hid);
Bob Moore15b8dd52009-06-29 13:39:29 +08001233
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001234static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1235{
1236 struct acpi_hardware_id *id;
Bob Moore15b8dd52009-06-29 13:39:29 +08001237
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001238 id = kmalloc(sizeof(*id), GFP_KERNEL);
1239 if (!id)
1240 return;
Bob Moore15b8dd52009-06-29 13:39:29 +08001241
Thomas Meyer581de592011-08-06 11:32:56 +02001242 id->id = kstrdup(dev_id, GFP_KERNEL);
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001243 if (!id->id) {
1244 kfree(id);
1245 return;
Bob Moore15b8dd52009-06-29 13:39:29 +08001246 }
1247
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001248 list_add_tail(&id->list, &device->pnp.ids);
Bob Moore15b8dd52009-06-29 13:39:29 +08001249}
1250
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001251/*
1252 * Old IBM workstations have a DSDT bug wherein the SMBus object
1253 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1254 * prefix. Work around this.
1255 */
1256static int acpi_ibm_smbus_match(struct acpi_device *device)
1257{
1258 acpi_handle h_dummy;
1259 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1260 int result;
1261
1262 if (!dmi_name_in_vendors("IBM"))
1263 return -ENODEV;
1264
1265 /* Look for SMBS object */
1266 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1267 if (result)
1268 return result;
1269
1270 if (strcmp("SMBS", path.pointer)) {
1271 result = -ENODEV;
1272 goto out;
1273 }
1274
1275 /* Does it have the necessary (but misnamed) methods? */
1276 result = -ENODEV;
1277 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1278 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1279 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1280 result = 0;
1281out:
1282 kfree(path.pointer);
1283 return result;
1284}
1285
Bjorn Helgaasc7bcb4e2009-09-21 19:29:25 +00001286static void acpi_device_set_id(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287{
Len Brown4be44fc2005-08-05 00:44:28 -04001288 acpi_status status;
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001289 struct acpi_device_info *info;
Lv Zheng78e25fe2012-10-31 02:25:24 +00001290 struct acpi_pnp_device_id_list *cid_list;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001291 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292
Bjorn Helgaasc7bcb4e2009-09-21 19:29:25 +00001293 switch (device->device_type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 case ACPI_BUS_TYPE_DEVICE:
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001295 if (ACPI_IS_ROOT_DEVICE(device)) {
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001296 acpi_add_id(device, ACPI_SYSTEM_HID);
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001297 break;
1298 }
1299
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +00001300 status = acpi_get_object_info(device->handle, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 if (ACPI_FAILURE(status)) {
Harvey Harrison96b2dd12008-03-05 18:24:51 -08001302 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001303 return;
1304 }
1305
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 if (info->valid & ACPI_VALID_HID)
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001307 acpi_add_id(device, info->hardware_id.string);
1308 if (info->valid & ACPI_VALID_CID) {
Bob Moore15b8dd52009-06-29 13:39:29 +08001309 cid_list = &info->compatible_id_list;
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001310 for (i = 0; i < cid_list->count; i++)
1311 acpi_add_id(device, cid_list->ids[i].string);
1312 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313 if (info->valid & ACPI_VALID_ADR) {
1314 device->pnp.bus_address = info->address;
1315 device->flags.bus_address = 1;
1316 }
Lv Zhengccf78042012-10-30 14:41:07 +01001317 if (info->valid & ACPI_VALID_UID)
1318 device->pnp.unique_id = kstrdup(info->unique_id.string,
1319 GFP_KERNEL);
Zhang Ruiae843332006-12-07 20:57:10 +08001320
Bjorn Helgaasa83893ae2009-10-02 11:03:12 -04001321 kfree(info);
1322
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001323 /*
1324 * Some devices don't reliably have _HIDs & _CIDs, so add
1325 * synthetic HIDs to make sure drivers can find them.
1326 */
Thomas Renningerc3d6de62008-08-01 17:37:55 +02001327 if (acpi_is_video_device(device))
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001328 acpi_add_id(device, ACPI_VIDEO_HID);
Frank Seidel3620f2f2007-12-07 13:20:34 +01001329 else if (ACPI_SUCCESS(acpi_bay_match(device)))
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001330 acpi_add_id(device, ACPI_BAY_HID);
Frank Seidel3620f2f2007-12-07 13:20:34 +01001331 else if (ACPI_SUCCESS(acpi_dock_match(device)))
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001332 acpi_add_id(device, ACPI_DOCK_HID);
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001333 else if (!acpi_ibm_smbus_match(device))
1334 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
Rafael J. Wysocki4f5f64c2013-01-04 23:00:54 +01001335 else if (list_empty(&device->pnp.ids) &&
Bjorn Helgaasb7b30de2010-03-24 10:44:33 -06001336 ACPI_IS_ROOT_DEVICE(device->parent)) {
1337 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1338 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1339 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1340 }
Zhang Rui54735262007-01-11 02:09:09 -05001341
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 break;
1343 case ACPI_BUS_TYPE_POWER:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001344 acpi_add_id(device, ACPI_POWER_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 break;
1346 case ACPI_BUS_TYPE_PROCESSOR:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001347 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 case ACPI_BUS_TYPE_THERMAL:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001350 acpi_add_id(device, ACPI_THERMAL_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351 break;
1352 case ACPI_BUS_TYPE_POWER_BUTTON:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001353 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 break;
1355 case ACPI_BUS_TYPE_SLEEP_BUTTON:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001356 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 break;
1358 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359}
1360
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001361static void acpi_init_device_object(struct acpi_device *device,
1362 acpi_handle handle,
1363 int type, unsigned long long sta)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364{
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001365 INIT_LIST_HEAD(&device->pnp.ids);
1366 device->device_type = type;
1367 device->handle = handle;
1368 device->parent = acpi_bus_get_parent(handle);
1369 STRUCT_TO_INT(device->status) = sta;
1370 acpi_device_get_busid(device);
1371 acpi_device_set_id(device);
1372 acpi_bus_get_flags(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373}
1374
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001375static int acpi_add_single_object(struct acpi_device **child,
1376 acpi_handle handle, int type,
Rafael J. Wysocki209d3b12012-12-21 00:36:48 +01001377 unsigned long long sta, bool match_driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378{
Bjorn Helgaas77c24882009-09-21 19:29:30 +00001379 int result;
1380 struct acpi_device *device;
Bjorn Helgaas29aaefa2009-09-21 19:28:54 +00001381 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382
Burman Yan36bcbec2006-12-19 12:56:11 -08001383 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 if (!device) {
Len Brown64684632006-06-26 23:41:38 -04001385 printk(KERN_ERR PREFIX "Memory allocation error\n");
Patrick Mocheld550d982006-06-27 00:41:40 -04001386 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001389 acpi_init_device_object(device, handle, type, sta);
1390 acpi_bus_get_power_flags(device);
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001391 acpi_bus_get_wakeup_device_flags(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392
Rafael J. Wysocki209d3b12012-12-21 00:36:48 +01001393 device->flags.match_driver = match_driver;
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +00001394 result = acpi_device_register(device);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001395 if (result) {
Hugh Dickins718fb0d2009-08-06 23:18:12 +00001396 acpi_device_release(&device->dev);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001397 return result;
1398 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001400 acpi_power_add_remove_device(device, true);
1401 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1402 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1403 dev_name(&device->dev), (char *) buffer.pointer,
1404 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1405 kfree(buffer.pointer);
1406 *child = device;
1407 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001410#define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1411 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING)
1412
Rafael J. Wysockibf325f92010-11-25 00:10:44 +01001413static void acpi_bus_add_power_resource(acpi_handle handle)
1414{
Rafael J. Wysockibf325f92010-11-25 00:10:44 +01001415 struct acpi_device *device = NULL;
1416
1417 acpi_bus_get_device(handle, &device);
1418 if (!device)
1419 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
Rafael J. Wysocki209d3b12012-12-21 00:36:48 +01001420 ACPI_STA_DEFAULT, true);
Rafael J. Wysockibf325f92010-11-25 00:10:44 +01001421}
1422
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001423static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1424 unsigned long long *sta)
1425{
1426 acpi_status status;
1427 acpi_object_type acpi_type;
1428
1429 status = acpi_get_type(handle, &acpi_type);
1430 if (ACPI_FAILURE(status))
1431 return -ENODEV;
1432
1433 switch (acpi_type) {
1434 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1435 case ACPI_TYPE_DEVICE:
1436 *type = ACPI_BUS_TYPE_DEVICE;
1437 status = acpi_bus_get_status_handle(handle, sta);
1438 if (ACPI_FAILURE(status))
1439 return -ENODEV;
1440 break;
1441 case ACPI_TYPE_PROCESSOR:
1442 *type = ACPI_BUS_TYPE_PROCESSOR;
1443 status = acpi_bus_get_status_handle(handle, sta);
1444 if (ACPI_FAILURE(status))
1445 return -ENODEV;
1446 break;
1447 case ACPI_TYPE_THERMAL:
1448 *type = ACPI_BUS_TYPE_THERMAL;
1449 *sta = ACPI_STA_DEFAULT;
1450 break;
1451 case ACPI_TYPE_POWER:
1452 *type = ACPI_BUS_TYPE_POWER;
1453 *sta = ACPI_STA_DEFAULT;
1454 break;
1455 default:
1456 return -ENODEV;
1457 }
1458
1459 return 0;
1460}
1461
Rafael J. Wysockie3863092012-12-21 00:36:47 +01001462static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1463 void *not_used, void **return_value)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464{
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001465 struct acpi_device *device = NULL;
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001466 int type;
1467 unsigned long long sta;
Bjorn Helgaase3b87f82009-09-21 19:30:11 +00001468 acpi_status status;
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001469 int result;
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001470
Rafael J. Wysocki4002bf32012-12-21 00:36:44 +01001471 acpi_bus_get_device(handle, &device);
1472 if (device)
1473 goto out;
1474
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001475 result = acpi_bus_type_and_status(handle, &type, &sta);
1476 if (result)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001477 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001479 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001480 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
Rafael J. Wysocki86e4e202011-01-06 23:40:00 +01001481 struct acpi_device_wakeup wakeup;
1482 acpi_handle temp;
1483
1484 status = acpi_get_handle(handle, "_PRW", &temp);
1485 if (ACPI_SUCCESS(status))
1486 acpi_bus_extract_wakeup_device_power_package(handle,
1487 &wakeup);
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001488 return AE_CTRL_DEPTH;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001489 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490
Rafael J. Wysockif95988d2013-01-07 21:17:02 +01001491 acpi_add_single_object(&device, handle, type, sta,
1492 type == ACPI_BUS_TYPE_POWER);
Bjorn Helgaase3b87f82009-09-21 19:30:11 +00001493 if (!device)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001494 return AE_CTRL_DEPTH;
1495
Rafael J. Wysocki209d3b12012-12-21 00:36:48 +01001496 device->flags.match_driver = true;
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001497
Rafael J. Wysocki4002bf32012-12-21 00:36:44 +01001498 out:
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001499 if (!*return_value)
1500 *return_value = device;
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001501
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001502 return AE_OK;
1503}
1504
Rafael J. Wysocki0fc300b2012-12-21 00:36:41 +01001505static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1506 void *not_used, void **ret_not_used)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001507{
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001508 acpi_status status = AE_OK;
1509 struct acpi_device *device;
1510 unsigned long long sta_not_used;
1511 int type_not_used;
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001512
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001513 /*
1514 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1515 * namespace walks prematurely.
1516 */
1517 if (acpi_bus_type_and_status(handle, &type_not_used, &sta_not_used))
1518 return AE_OK;
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001519
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001520 if (acpi_bus_get_device(handle, &device))
1521 return AE_CTRL_DEPTH;
Thomas Renninger77796882010-01-29 17:48:52 +01001522
Rafael J. Wysocki0fc300b2012-12-21 00:36:41 +01001523 if (!acpi_match_device_ids(device, acpi_platform_device_ids)) {
1524 /* This is a known good platform device. */
1525 acpi_create_platform_device(device);
Mika Westerbergabe99212013-01-11 22:08:09 +01001526 } else if (device_attach(&device->dev) < 0) {
Rafael J. Wysocki0fc300b2012-12-21 00:36:41 +01001527 status = AE_CTRL_DEPTH;
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001528 }
1529 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001532static int acpi_bus_scan(acpi_handle handle)
Rajesh Shah3fb02732005-04-28 00:25:52 -07001533{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534 void *device = NULL;
Rajesh Shah3fb02732005-04-28 00:25:52 -07001535
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001536 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
Rafael J. Wysockie3863092012-12-21 00:36:47 +01001538 acpi_bus_check_add, NULL, NULL, &device);
Rajesh Shah3fb02732005-04-28 00:25:52 -07001539
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001540 if (!device)
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001541 return -ENODEV;
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001542
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001543 if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001544 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
Rafael J. Wysocki0fc300b2012-12-21 00:36:41 +01001545 acpi_bus_device_attach, NULL, NULL, NULL);
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001546
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001547 return 0;
Rajesh Shah3fb02732005-04-28 00:25:52 -07001548}
1549
Rafael J. Wysocki636458d2012-12-21 00:36:47 +01001550/**
1551 * acpi_bus_add - Add ACPI device node objects in a given namespace scope.
1552 * @handle: Root of the namespace scope to scan.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553 *
Rafael J. Wysocki636458d2012-12-21 00:36:47 +01001554 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1555 * found devices.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556 *
Rafael J. Wysocki636458d2012-12-21 00:36:47 +01001557 * If no devices were found, -ENODEV is returned, but it does not mean that
1558 * there has been a real error. There just have been no suitable ACPI objects
1559 * in the table trunk from which the kernel could create a device and add an
1560 * appropriate driver.
Rajesh Shah3fb02732005-04-28 00:25:52 -07001561 */
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001562int acpi_bus_add(acpi_handle handle)
Rajesh Shah3fb02732005-04-28 00:25:52 -07001563{
Rafael J. Wysocki02f57c62012-12-21 00:36:46 +01001564 int err;
Rajesh Shah3fb02732005-04-28 00:25:52 -07001565
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001566 err = acpi_bus_scan(handle);
Rafael J. Wysocki02f57c62012-12-21 00:36:46 +01001567 if (err)
1568 return err;
Rafael J. Wysockia2100802010-09-16 00:30:43 +02001569
Lin Ming3a378982010-12-13 13:36:15 +08001570 acpi_update_all_gpes();
Rafael J. Wysocki0fc300b2012-12-21 00:36:41 +01001571 return 0;
Rajesh Shah3fb02732005-04-28 00:25:52 -07001572}
1573EXPORT_SYMBOL(acpi_bus_add);
1574
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001575static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1576 void *not_used, void **ret_not_used)
Len Brown4be44fc2005-08-05 00:44:28 -04001577{
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001578 struct acpi_device *device = NULL;
Rajesh Shah3fb02732005-04-28 00:25:52 -07001579
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001580 if (!acpi_bus_get_device(handle, &device)) {
1581 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1582 device_release_driver(&device->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583 }
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001584 return AE_OK;
1585}
1586
1587static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1588 void *not_used, void **ret_not_used)
1589{
1590 struct acpi_device *device = NULL;
1591
1592 if (!acpi_bus_get_device(handle, &device))
1593 acpi_device_unregister(device);
1594
1595 return AE_OK;
1596}
1597
Rafael J. Wysockiae281792013-01-15 13:23:53 +01001598int acpi_bus_trim(struct acpi_device *start)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599{
Rafael J. Wysockicecdb192013-01-15 13:24:02 +01001600 /*
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001601 * Execute acpi_bus_device_detach() as a post-order callback to detach
1602 * all ACPI drivers from the device nodes being removed.
1603 */
1604 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1605 acpi_bus_device_detach, NULL, NULL);
1606 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1607 /*
Rafael J. Wysockicecdb192013-01-15 13:24:02 +01001608 * Execute acpi_bus_remove() as a post-order callback to remove device
1609 * nodes in the given namespace scope.
1610 */
1611 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1612 acpi_bus_remove, NULL, NULL);
1613 acpi_bus_remove(start->handle, 0, NULL, NULL);
1614 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615}
Kristen Accardiceaba662006-02-23 17:56:01 -08001616EXPORT_SYMBOL_GPL(acpi_bus_trim);
1617
Bjorn Helgaase8b945c2009-09-21 19:28:59 +00001618static int acpi_bus_scan_fixed(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619{
Len Brown4be44fc2005-08-05 00:44:28 -04001620 int result = 0;
1621 struct acpi_device *device = NULL;
Li Shaohuac4168bf2006-12-07 20:56:41 +08001622
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623 /*
1624 * Enumerate all fixed-feature devices.
1625 */
Alexey Starikovskiycee324b2007-02-02 19:48:22 +03001626 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001627 result = acpi_add_single_object(&device, NULL,
Li Shaohuac4168bf2006-12-07 20:56:41 +08001628 ACPI_BUS_TYPE_POWER_BUTTON,
Rafael J. Wysocki209d3b12012-12-21 00:36:48 +01001629 ACPI_STA_DEFAULT, true);
Daniel Drakec10d7a12012-05-10 00:08:43 +01001630 device_init_wakeup(&device->dev, true);
Rajesh Shah3fb02732005-04-28 00:25:52 -07001631 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632
Alexey Starikovskiycee324b2007-02-02 19:48:22 +03001633 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001634 result = acpi_add_single_object(&device, NULL,
Li Shaohuac4168bf2006-12-07 20:56:41 +08001635 ACPI_BUS_TYPE_SLEEP_BUTTON,
Rafael J. Wysocki209d3b12012-12-21 00:36:48 +01001636 ACPI_STA_DEFAULT, true);
Rajesh Shah3fb02732005-04-28 00:25:52 -07001637 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638
Patrick Mocheld550d982006-06-27 00:41:40 -04001639 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640}
1641
Bjorn Helgaase747f272009-03-24 16:49:43 -06001642int __init acpi_scan_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001643{
1644 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001645
Patrick Mochel5b327262006-05-10 10:33:00 -04001646 result = bus_register(&acpi_bus_type);
1647 if (result) {
1648 /* We don't want to quit even if we failed to add suspend/resume */
1649 printk(KERN_ERR PREFIX "Could not register bus type\n");
1650 }
1651
Rafael J. Wysocki97d9a9e2010-11-25 00:10:02 +01001652 acpi_power_init();
Rafael J. Wysocki92ef2a22012-12-21 00:36:40 +01001653 acpi_pci_root_init();
Rafael J. Wysocki97d9a9e2010-11-25 00:10:02 +01001654
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 * Enumerate devices in the ACPI namespace.
1657 */
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001658 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1659 if (result)
1660 return result;
Alexey Starikovskiyc04209a2008-01-01 14:12:55 -05001661
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001662 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
Li Shaohuac4168bf2006-12-07 20:56:41 +08001663 if (!result)
Bjorn Helgaasadc08e22009-09-21 19:29:45 +00001664 result = acpi_bus_scan_fixed();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665
1666 if (result)
Rafael J. Wysockib17b5372013-01-15 13:23:44 +01001667 acpi_device_unregister(acpi_root);
Rafael J. Wysockia2100802010-09-16 00:30:43 +02001668 else
Lin Ming3a378982010-12-13 13:36:15 +08001669 acpi_update_all_gpes();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670
Patrick Mocheld550d982006-06-27 00:41:40 -04001671 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672}