blob: fe9f2c926663dede551bb47b8b53e46e0e6dc4c0 [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 */
Mika Westerberge3753252013-01-18 13:46:01 +000041 { "INT33C0", ACPI_PLATFORM_CLK },
42 { "INT33C1", ACPI_PLATFORM_CLK },
43 { "INT33C2", ACPI_PLATFORM_CLK },
44 { "INT33C3", ACPI_PLATFORM_CLK },
45 { "INT33C4", ACPI_PLATFORM_CLK },
46 { "INT33C5", ACPI_PLATFORM_CLK },
47 { "INT33C6", ACPI_PLATFORM_CLK },
48 { "INT33C7", ACPI_PLATFORM_CLK },
Mika Westerberg5e7779f2012-12-07 23:12:01 +010049
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);
Rafael J. Wysockic511cc12013-01-27 21:17:29 +010055static DEFINE_MUTEX(acpi_scan_lock);
Shaohua Li90905892009-04-07 10:24:29 +080056DEFINE_MUTEX(acpi_device_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057LIST_HEAD(acpi_wakeup_device_list);
58
Zhang Ruie49bd2dd2006-12-08 17:23:43 +080059struct acpi_device_bus_id{
Zhang Ruibb095852007-01-04 15:03:18 +080060 char bus_id[15];
Zhang Ruie49bd2dd2006-12-08 17:23:43 +080061 unsigned int instance_no;
62 struct list_head node;
63};
Thomas Renninger29b71a12007-07-23 14:43:51 +020064
65/*
66 * Creates hid/cid(s) string needed for modalias and uevent
67 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
68 * char *modalias: "acpi:IBM0001:ACPI0001"
69*/
Adrian Bunkb3e572d2007-08-14 23:22:35 +020070static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
71 int size)
72{
Thomas Renninger29b71a12007-07-23 14:43:51 +020073 int len;
Zhang Rui5c9fcb52008-03-20 16:40:32 +080074 int count;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -060075 struct acpi_hardware_id *id;
Thomas Renninger29b71a12007-07-23 14:43:51 +020076
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +020077 if (list_empty(&acpi_dev->pnp.ids))
78 return 0;
79
Zhang Rui5c9fcb52008-03-20 16:40:32 +080080 len = snprintf(modalias, size, "acpi:");
Thomas Renninger29b71a12007-07-23 14:43:51 +020081 size -= len;
82
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -060083 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
84 count = snprintf(&modalias[len], size, "%s:", id->id);
Zhang Rui5c9fcb52008-03-20 16:40:32 +080085 if (count < 0 || count >= size)
86 return -EINVAL;
87 len += count;
88 size -= count;
89 }
90
Thomas Renninger29b71a12007-07-23 14:43:51 +020091 modalias[len] = '\0';
92 return len;
93}
94
95static ssize_t
96acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
97 struct acpi_device *acpi_dev = to_acpi_device(dev);
98 int len;
99
100 /* Device has no HID and no CID or string is >1024 */
101 len = create_modalias(acpi_dev, buf, 1024);
102 if (len <= 0)
103 return 0;
104 buf[len++] = '\n';
105 return len;
106}
107static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
108
Toshi Kanic4753e52012-05-23 20:25:20 -0600109/**
110 * acpi_bus_hot_remove_device: hot-remove a device and its children
111 * @context: struct acpi_eject_event pointer (freed in this func)
112 *
113 * Hot-remove a device and its children. This function frees up the
114 * memory space passed by arg context, so that the caller may call
115 * this function asynchronously through acpi_os_hotplug_execute().
116 */
117void acpi_bus_hot_remove_device(void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118{
Toshi Kanic4753e52012-05-23 20:25:20 -0600119 struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
Yinghai Lu5993c462013-01-11 22:40:41 +0000120 struct acpi_device *device = ej_event->device;
121 acpi_handle handle = device->handle;
Toshi Kanib3c450c2012-10-26 13:38:57 +0200122 acpi_handle temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 struct acpi_object_list arg_list;
124 union acpi_object arg;
125 acpi_status status = AE_OK;
Toshi Kanic4753e52012-05-23 20:25:20 -0600126 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
Zhang Rui26d46862008-04-29 02:35:48 -0400128 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Kay Sievers07944692008-10-30 01:18:59 +0100129 "Hot-removing device %s...\n", dev_name(&device->dev)));
Zhang Rui26d46862008-04-29 02:35:48 -0400130
Rafael J. Wysockibfee26d2013-01-26 00:27:44 +0100131 acpi_bus_trim(device);
132 /* Device node has been released. */
Toshi Kanib3c450c2012-10-26 13:38:57 +0200133 device = NULL;
134
Zhang Rui26d46862008-04-29 02:35:48 -0400135 /* power off device */
136 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
137 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
Lin Ming55ac9a02008-09-28 14:51:56 +0800138 printk(KERN_WARNING PREFIX
139 "Power-off device failed\n");
Zhang Rui26d46862008-04-29 02:35:48 -0400140
Toshi Kanib3c450c2012-10-26 13:38:57 +0200141 if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 arg_list.count = 1;
143 arg_list.pointer = &arg;
144 arg.type = ACPI_TYPE_INTEGER;
145 arg.integer.value = 0;
146 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
147 }
148
149 arg_list.count = 1;
150 arg_list.pointer = &arg;
151 arg.type = ACPI_TYPE_INTEGER;
152 arg.integer.value = 1;
153
154 /*
155 * TBD: _EJD support.
156 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
Toshi Kanic4753e52012-05-23 20:25:20 -0600158 if (ACPI_FAILURE(status)) {
159 if (status != AE_NOT_FOUND)
160 printk(KERN_WARNING PREFIX
161 "Eject device failed\n");
162 goto err_out;
163 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Toshi Kanic4753e52012-05-23 20:25:20 -0600165 kfree(context);
166 return;
167
168err_out:
169 /* Inform firmware the hot-remove operation has completed w/ error */
170 (void) acpi_evaluate_hotplug_ost(handle,
171 ej_event->event, ost_code, NULL);
172 kfree(context);
Zhang Ruic8d72a52009-06-22 11:31:16 +0800173 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174}
Toshi Kani61622ac2012-11-01 14:42:12 +0000175EXPORT_SYMBOL(acpi_bus_hot_remove_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
Rafael J. Wysocki836aedb2013-01-24 12:49:59 +0100177static ssize_t real_power_state_show(struct device *dev,
178 struct device_attribute *attr, char *buf)
179{
180 struct acpi_device *adev = to_acpi_device(dev);
181 int state;
182 int ret;
183
184 ret = acpi_device_get_power(adev, &state);
185 if (ret)
186 return ret;
187
188 return sprintf(buf, "%s\n", acpi_power_state_string(state));
189}
190
191static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
192
193static ssize_t power_state_show(struct device *dev,
194 struct device_attribute *attr, char *buf)
195{
196 struct acpi_device *adev = to_acpi_device(dev);
197
198 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
199}
200
201static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
202
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203static ssize_t
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800204acpi_eject_store(struct device *d, struct device_attribute *attr,
205 const char *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206{
Len Brown4be44fc2005-08-05 00:44:28 -0400207 int ret = count;
Len Brown4be44fc2005-08-05 00:44:28 -0400208 acpi_status status;
Len Brown4be44fc2005-08-05 00:44:28 -0400209 acpi_object_type type = 0;
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800210 struct acpi_device *acpi_device = to_acpi_device(d);
Toshi Kanic4753e52012-05-23 20:25:20 -0600211 struct acpi_eject_event *ej_event;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
213 if ((!count) || (buf[0] != '1')) {
214 return -EINVAL;
215 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216#ifndef FORCE_EJECT
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800217 if (acpi_device->driver == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 ret = -ENODEV;
219 goto err;
220 }
221#endif
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800222 status = acpi_get_type(acpi_device->handle, &type);
223 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 ret = -ENODEV;
225 goto err;
226 }
227
Toshi Kanic4753e52012-05-23 20:25:20 -0600228 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
229 if (!ej_event) {
230 ret = -ENOMEM;
231 goto err;
232 }
233
Yinghai Lu5993c462013-01-11 22:40:41 +0000234 ej_event->device = acpi_device;
Toshi Kanic4753e52012-05-23 20:25:20 -0600235 if (acpi_device->flags.eject_pending) {
236 /* event originated from ACPI eject notification */
237 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
238 acpi_device->flags.eject_pending = 0;
239 } else {
240 /* event originated from user */
241 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
Yinghai Lu5993c462013-01-11 22:40:41 +0000242 (void) acpi_evaluate_hotplug_ost(acpi_device->handle,
Toshi Kanic4753e52012-05-23 20:25:20 -0600243 ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
244 }
245
246 acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
Alok N Kataria74523c92008-06-13 12:54:24 -0400247err:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249}
250
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800251static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800253static ssize_t
254acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
255 struct acpi_device *acpi_dev = to_acpi_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
Bjorn Helgaasea8d82f2009-09-21 13:35:09 -0600257 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800258}
259static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
260
Lv Zheng923d4a42012-10-30 14:43:26 +0100261static ssize_t acpi_device_uid_show(struct device *dev,
262 struct device_attribute *attr, char *buf)
263{
264 struct acpi_device *acpi_dev = to_acpi_device(dev);
265
266 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
267}
268static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
269
270static ssize_t acpi_device_adr_show(struct device *dev,
271 struct device_attribute *attr, char *buf)
272{
273 struct acpi_device *acpi_dev = to_acpi_device(dev);
274
275 return sprintf(buf, "0x%08x\n",
276 (unsigned int)(acpi_dev->pnp.bus_address));
277}
278static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
279
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800280static ssize_t
281acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
282 struct acpi_device *acpi_dev = to_acpi_device(dev);
283 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
284 int result;
285
286 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
Alex Chiang0c526d92009-05-14 08:31:37 -0600287 if (result)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800288 goto end;
289
290 result = sprintf(buf, "%s\n", (char*)path.pointer);
291 kfree(path.pointer);
Alex Chiang0c526d92009-05-14 08:31:37 -0600292end:
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800293 return result;
294}
295static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
296
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600297/* sysfs file that shows description text from the ACPI _STR method */
298static ssize_t description_show(struct device *dev,
299 struct device_attribute *attr,
300 char *buf) {
301 struct acpi_device *acpi_dev = to_acpi_device(dev);
302 int result;
303
304 if (acpi_dev->pnp.str_obj == NULL)
305 return 0;
306
307 /*
308 * The _STR object contains a Unicode identifier for a device.
309 * We need to convert to utf-8 so it can be displayed.
310 */
311 result = utf16s_to_utf8s(
312 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
313 acpi_dev->pnp.str_obj->buffer.length,
314 UTF16_LITTLE_ENDIAN, buf,
315 PAGE_SIZE);
316
317 buf[result++] = '\n';
318
319 return result;
320}
321static DEVICE_ATTR(description, 0444, description_show, NULL);
322
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100323static ssize_t
324acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
325 char *buf) {
326 struct acpi_device *acpi_dev = to_acpi_device(dev);
327
328 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
329}
330static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
331
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800332static int acpi_device_setup_files(struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333{
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600334 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800335 acpi_status status;
336 acpi_handle temp;
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100337 unsigned long long sun;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800338 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800340 /*
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800341 * Devices gotten from FADT don't have a "path" attribute
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800342 */
Alex Chiang0c526d92009-05-14 08:31:37 -0600343 if (dev->handle) {
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800344 result = device_create_file(&dev->dev, &dev_attr_path);
Alex Chiang0c526d92009-05-14 08:31:37 -0600345 if (result)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800346 goto end;
347 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200349 if (!list_empty(&dev->pnp.ids)) {
350 result = device_create_file(&dev->dev, &dev_attr_hid);
351 if (result)
352 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200354 result = device_create_file(&dev->dev, &dev_attr_modalias);
355 if (result)
356 goto end;
357 }
Thomas Renninger29b71a12007-07-23 14:43:51 +0200358
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600359 /*
360 * If device has _STR, 'description' file is created
361 */
362 status = acpi_get_handle(dev->handle, "_STR", &temp);
363 if (ACPI_SUCCESS(status)) {
364 status = acpi_evaluate_object(dev->handle, "_STR",
365 NULL, &buffer);
366 if (ACPI_FAILURE(status))
367 buffer.pointer = NULL;
368 dev->pnp.str_obj = buffer.pointer;
369 result = device_create_file(&dev->dev, &dev_attr_description);
370 if (result)
371 goto end;
372 }
373
Lv Zheng923d4a42012-10-30 14:43:26 +0100374 if (dev->flags.bus_address)
375 result = device_create_file(&dev->dev, &dev_attr_adr);
376 if (dev->pnp.unique_id)
377 result = device_create_file(&dev->dev, &dev_attr_uid);
378
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100379 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
380 if (ACPI_SUCCESS(status)) {
381 dev->pnp.sun = (unsigned long)sun;
382 result = device_create_file(&dev->dev, &dev_attr_sun);
383 if (result)
384 goto end;
385 } else {
386 dev->pnp.sun = (unsigned long)-1;
387 }
388
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800389 /*
390 * If device has _EJ0, 'eject' file is created that is used to trigger
391 * hot-removal function from userland.
392 */
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800393 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
Rafael J. Wysocki836aedb2013-01-24 12:49:59 +0100394 if (ACPI_SUCCESS(status)) {
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800395 result = device_create_file(&dev->dev, &dev_attr_eject);
Rafael J. Wysocki836aedb2013-01-24 12:49:59 +0100396 if (result)
397 return result;
398 }
399
400 if (dev->flags.power_manageable) {
401 result = device_create_file(&dev->dev, &dev_attr_power_state);
402 if (result)
403 return result;
404
405 if (dev->power.flags.power_resources)
406 result = device_create_file(&dev->dev,
407 &dev_attr_real_power_state);
408 }
409
Alex Chiang0c526d92009-05-14 08:31:37 -0600410end:
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800411 return result;
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800412}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800414static void acpi_device_remove_files(struct acpi_device *dev)
415{
416 acpi_status status;
417 acpi_handle temp;
418
Rafael J. Wysocki836aedb2013-01-24 12:49:59 +0100419 if (dev->flags.power_manageable) {
420 device_remove_file(&dev->dev, &dev_attr_power_state);
421 if (dev->power.flags.power_resources)
422 device_remove_file(&dev->dev,
423 &dev_attr_real_power_state);
424 }
425
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800426 /*
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600427 * If device has _STR, remove 'description' file
428 */
429 status = acpi_get_handle(dev->handle, "_STR", &temp);
430 if (ACPI_SUCCESS(status)) {
431 kfree(dev->pnp.str_obj);
432 device_remove_file(&dev->dev, &dev_attr_description);
433 }
434 /*
435 * If device has _EJ0, remove 'eject' file.
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800436 */
437 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
438 if (ACPI_SUCCESS(status))
439 device_remove_file(&dev->dev, &dev_attr_eject);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800440
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100441 status = acpi_get_handle(dev->handle, "_SUN", &temp);
442 if (ACPI_SUCCESS(status))
443 device_remove_file(&dev->dev, &dev_attr_sun);
444
Lv Zheng923d4a42012-10-30 14:43:26 +0100445 if (dev->pnp.unique_id)
446 device_remove_file(&dev->dev, &dev_attr_uid);
447 if (dev->flags.bus_address)
448 device_remove_file(&dev->dev, &dev_attr_adr);
Bjorn Helgaas1131b932009-09-21 13:35:29 -0600449 device_remove_file(&dev->dev, &dev_attr_modalias);
450 device_remove_file(&dev->dev, &dev_attr_hid);
Alex Chiang0c526d92009-05-14 08:31:37 -0600451 if (dev->handle)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800452 device_remove_file(&dev->dev, &dev_attr_path);
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800453}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454/* --------------------------------------------------------------------------
Zhang Rui9e89dde2006-12-07 20:56:16 +0800455 ACPI Bus operations
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 -------------------------------------------------------------------------- */
Thomas Renninger29b71a12007-07-23 14:43:51 +0200457
Mika Westerbergcf761af2012-10-31 22:44:41 +0100458static const struct acpi_device_id *__acpi_match_device(
459 struct acpi_device *device, const struct acpi_device_id *ids)
Thomas Renninger29b71a12007-07-23 14:43:51 +0200460{
461 const struct acpi_device_id *id;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600462 struct acpi_hardware_id *hwid;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200463
Zhao Yakui39a0ad82008-08-11 13:40:22 +0800464 /*
465 * If the device is not present, it is unnecessary to load device
466 * driver for it.
467 */
468 if (!device->status.present)
Mika Westerbergcf761af2012-10-31 22:44:41 +0100469 return NULL;
Zhao Yakui39a0ad82008-08-11 13:40:22 +0800470
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600471 for (id = ids; id->id[0]; id++)
472 list_for_each_entry(hwid, &device->pnp.ids, list)
473 if (!strcmp((char *) id->id, hwid->id))
Mika Westerbergcf761af2012-10-31 22:44:41 +0100474 return id;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200475
Mika Westerbergcf761af2012-10-31 22:44:41 +0100476 return NULL;
477}
478
479/**
480 * acpi_match_device - Match a struct device against a given list of ACPI IDs
481 * @ids: Array of struct acpi_device_id object to match against.
482 * @dev: The device structure to match.
483 *
484 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
485 * object for that handle and use that object to match against a given list of
486 * device IDs.
487 *
488 * Return a pointer to the first matching ID on success or %NULL on failure.
489 */
490const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
491 const struct device *dev)
492{
493 struct acpi_device *adev;
494
Rafael J. Wysocki95f8a082012-11-21 00:21:50 +0100495 if (!ids || !ACPI_HANDLE(dev)
496 || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
Mika Westerbergcf761af2012-10-31 22:44:41 +0100497 return NULL;
498
499 return __acpi_match_device(adev, ids);
500}
501EXPORT_SYMBOL_GPL(acpi_match_device);
502
503int acpi_match_device_ids(struct acpi_device *device,
504 const struct acpi_device_id *ids)
505{
506 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200507}
508EXPORT_SYMBOL(acpi_match_device_ids);
509
Rafael J. Wysocki82c7d5e2013-01-17 14:11:05 +0100510void acpi_free_ids(struct acpi_device *device)
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600511{
512 struct acpi_hardware_id *id, *tmp;
513
514 list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
515 kfree(id->id);
516 kfree(id);
517 }
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100518 kfree(device->pnp.unique_id);
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600519}
520
Rafael J. Wysocki0b224522013-01-17 14:11:06 +0100521static void acpi_free_power_resources_lists(struct acpi_device *device)
522{
523 int i;
524
Rafael J. Wysocki993cbe52013-01-17 14:11:06 +0100525 if (device->wakeup.flags.valid)
526 acpi_power_resources_list_free(&device->wakeup.resources);
527
Rafael J. Wysocki0b224522013-01-17 14:11:06 +0100528 if (!device->flags.power_manageable)
529 return;
530
531 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
532 struct acpi_device_power_state *ps = &device->power.states[i];
533 acpi_power_resources_list_free(&ps->resources);
534 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535}
536
Patrick Mochel1890a972006-12-07 20:56:31 +0800537static void acpi_device_release(struct device *dev)
538{
539 struct acpi_device *acpi_dev = to_acpi_device(dev);
540
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600541 acpi_free_ids(acpi_dev);
Rafael J. Wysocki0b224522013-01-17 14:11:06 +0100542 acpi_free_power_resources_lists(acpi_dev);
Patrick Mochel1890a972006-12-07 20:56:31 +0800543 kfree(acpi_dev);
544}
545
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800546static int acpi_bus_match(struct device *dev, struct device_driver *drv)
547{
548 struct acpi_device *acpi_dev = to_acpi_device(dev);
549 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
550
Rafael J. Wysocki209d3b12012-12-21 00:36:48 +0100551 return acpi_dev->flags.match_driver
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +0100552 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800553}
554
Kay Sievers7eff2e72007-08-14 15:15:12 +0200555static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800556{
557 struct acpi_device *acpi_dev = to_acpi_device(dev);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200558 int len;
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800559
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200560 if (list_empty(&acpi_dev->pnp.ids))
561 return 0;
562
Kay Sievers7eff2e72007-08-14 15:15:12 +0200563 if (add_uevent_var(env, "MODALIAS="))
564 return -ENOMEM;
565 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
566 sizeof(env->buf) - env->buflen);
567 if (len >= (sizeof(env->buf) - env->buflen))
568 return -ENOMEM;
569 env->buflen += len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 return 0;
571}
572
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000573static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
574{
575 struct acpi_device *device = data;
576
577 device->driver->ops.notify(device, event);
578}
579
580static acpi_status acpi_device_notify_fixed(void *data)
581{
582 struct acpi_device *device = data;
583
Bjorn Helgaas53de5352009-08-31 22:32:20 +0000584 /* Fixed hardware devices have no handles */
585 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000586 return AE_OK;
587}
588
589static int acpi_device_install_notify_handler(struct acpi_device *device)
590{
591 acpi_status status;
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000592
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000593 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000594 status =
595 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
596 acpi_device_notify_fixed,
597 device);
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000598 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000599 status =
600 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
601 acpi_device_notify_fixed,
602 device);
603 else
604 status = acpi_install_notify_handler(device->handle,
605 ACPI_DEVICE_NOTIFY,
606 acpi_device_notify,
607 device);
608
609 if (ACPI_FAILURE(status))
610 return -EINVAL;
611 return 0;
612}
613
614static void acpi_device_remove_notify_handler(struct acpi_device *device)
615{
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000616 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000617 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
618 acpi_device_notify_fixed);
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000619 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000620 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
621 acpi_device_notify_fixed);
622 else
623 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
624 acpi_device_notify);
625}
626
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800627static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800628static int acpi_device_probe(struct device * dev)
Zhang Rui9e89dde2006-12-07 20:56:16 +0800629{
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800630 struct acpi_device *acpi_dev = to_acpi_device(dev);
631 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
632 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800634 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
635 if (!ret) {
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000636 if (acpi_drv->ops.notify) {
637 ret = acpi_device_install_notify_handler(acpi_dev);
638 if (ret) {
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000639 if (acpi_drv->ops.remove)
Rafael J. Wysocki51fac832013-01-24 00:24:48 +0100640 acpi_drv->ops.remove(acpi_dev);
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000641 return ret;
642 }
643 }
644
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800645 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
646 "Found driver [%s] for device [%s]\n",
647 acpi_drv->name, acpi_dev->pnp.bus_id));
648 get_device(dev);
Zhang Rui9e89dde2006-12-07 20:56:16 +0800649 }
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800650 return ret;
651}
652
653static int acpi_device_remove(struct device * dev)
654{
655 struct acpi_device *acpi_dev = to_acpi_device(dev);
656 struct acpi_driver *acpi_drv = acpi_dev->driver;
657
658 if (acpi_drv) {
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000659 if (acpi_drv->ops.notify)
660 acpi_device_remove_notify_handler(acpi_dev);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800661 if (acpi_drv->ops.remove)
Rafael J. Wysocki51fac832013-01-24 00:24:48 +0100662 acpi_drv->ops.remove(acpi_dev);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800663 }
664 acpi_dev->driver = NULL;
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700665 acpi_dev->driver_data = NULL;
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800666
667 put_device(dev);
Zhang Rui9e89dde2006-12-07 20:56:16 +0800668 return 0;
669}
670
David Brownell55955aa2007-05-08 00:28:35 -0700671struct bus_type acpi_bus_type = {
Zhang Rui9e89dde2006-12-07 20:56:16 +0800672 .name = "acpi",
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800673 .match = acpi_bus_match,
674 .probe = acpi_device_probe,
675 .remove = acpi_device_remove,
676 .uevent = acpi_device_uevent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677};
678
Rafael J. Wysockicf860be2013-01-24 12:49:49 +0100679int acpi_device_add(struct acpi_device *device,
680 void (*release)(struct device *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681{
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800682 int result;
683 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
684 int found = 0;
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +0000685
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100686 if (device->handle) {
687 acpi_status status;
688
689 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
690 device);
691 if (ACPI_FAILURE(status)) {
692 acpi_handle_err(device->handle,
693 "Unable to attach device data\n");
694 return -ENODEV;
695 }
696 }
697
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 /*
699 * Linkage
700 * -------
701 * Link this device to its parent and siblings.
702 */
703 INIT_LIST_HEAD(&device->children);
704 INIT_LIST_HEAD(&device->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 INIT_LIST_HEAD(&device->wakeup_list);
Lan Tianyu1033f902012-08-17 14:44:09 +0800706 INIT_LIST_HEAD(&device->physical_node_list);
707 mutex_init(&device->physical_node_lock);
Rafael J. Wysockibc9b6402013-01-17 14:11:05 +0100708 INIT_LIST_HEAD(&device->power_dependent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800710 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
711 if (!new_bus_id) {
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100712 pr_err(PREFIX "Memory allocation error\n");
713 result = -ENOMEM;
714 goto err_detach;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800715 }
716
Shaohua Li90905892009-04-07 10:24:29 +0800717 mutex_lock(&acpi_device_lock);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800718 /*
719 * Find suitable bus_id and instance number in acpi_bus_id_list
720 * If failed, create one and link it into acpi_bus_id_list
721 */
722 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
Bjorn Helgaas1131b932009-09-21 13:35:29 -0600723 if (!strcmp(acpi_device_bus_id->bus_id,
724 acpi_device_hid(device))) {
725 acpi_device_bus_id->instance_no++;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800726 found = 1;
727 kfree(new_bus_id);
728 break;
729 }
730 }
Alex Chiang0c526d92009-05-14 08:31:37 -0600731 if (!found) {
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800732 acpi_device_bus_id = new_bus_id;
Bjorn Helgaas1131b932009-09-21 13:35:29 -0600733 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800734 acpi_device_bus_id->instance_no = 0;
735 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
736 }
Kay Sievers07944692008-10-30 01:18:59 +0100737 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 +0800738
Len Brown33b57152008-12-15 22:09:26 -0500739 if (device->parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 list_add_tail(&device->node, &device->parent->children);
Len Brown33b57152008-12-15 22:09:26 -0500741
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 if (device->wakeup.flags.valid)
743 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
Shaohua Li90905892009-04-07 10:24:29 +0800744 mutex_unlock(&acpi_device_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745
Patrick Mochel1890a972006-12-07 20:56:31 +0800746 if (device->parent)
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +0000747 device->dev.parent = &device->parent->dev;
Patrick Mochel1890a972006-12-07 20:56:31 +0800748 device->dev.bus = &acpi_bus_type;
Rafael J. Wysocki82c7d5e2013-01-17 14:11:05 +0100749 device->dev.release = release;
Rafael J. Wysockicf860be2013-01-24 12:49:49 +0100750 result = device_add(&device->dev);
Alex Chiang0c526d92009-05-14 08:31:37 -0600751 if (result) {
Alex Chiang8b12b922009-05-14 08:31:32 -0600752 dev_err(&device->dev, "Error registering device\n");
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100753 goto err;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800754 }
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800755
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800756 result = acpi_device_setup_files(device);
Alex Chiang0c526d92009-05-14 08:31:37 -0600757 if (result)
Kay Sievers07944692008-10-30 01:18:59 +0100758 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
759 dev_name(&device->dev));
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800760
Li Shaohua96333572006-12-07 20:56:46 +0800761 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800762 return 0;
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100763
764 err:
Shaohua Li90905892009-04-07 10:24:29 +0800765 mutex_lock(&acpi_device_lock);
Len Brown33b57152008-12-15 22:09:26 -0500766 if (device->parent)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800767 list_del(&device->node);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800768 list_del(&device->wakeup_list);
Shaohua Li90905892009-04-07 10:24:29 +0800769 mutex_unlock(&acpi_device_lock);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100770
771 err_detach:
772 acpi_detach_data(device->handle, acpi_bus_data_handler);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800773 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774}
775
Rafael J. Wysockib17b5372013-01-15 13:23:44 +0100776static void acpi_device_unregister(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777{
Shaohua Li90905892009-04-07 10:24:29 +0800778 mutex_lock(&acpi_device_lock);
Len Brown33b57152008-12-15 22:09:26 -0500779 if (device->parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 list_del(&device->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
782 list_del(&device->wakeup_list);
Shaohua Li90905892009-04-07 10:24:29 +0800783 mutex_unlock(&acpi_device_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784
785 acpi_detach_data(device->handle, acpi_bus_data_handler);
Patrick Mochel1890a972006-12-07 20:56:31 +0800786
Rafael J. Wysockibc9b6402013-01-17 14:11:05 +0100787 acpi_power_add_remove_device(device, false);
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800788 acpi_device_remove_files(device);
Rafael J. Wysockib1c0f992013-01-24 12:50:09 +0100789 if (device->remove)
790 device->remove(device);
791
Rafael J. Wysockicf860be2013-01-24 12:49:49 +0100792 device_del(&device->dev);
Rafael J. Wysockibc9b6402013-01-17 14:11:05 +0100793 /*
794 * Drop the reference counts of all power resources the device depends
795 * on and turn off the ones that have no more references.
796 */
797 acpi_power_transition(device, ACPI_STATE_D3_COLD);
Rafael J. Wysockicf860be2013-01-24 12:49:49 +0100798 put_device(&device->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799}
800
Zhang Rui9e89dde2006-12-07 20:56:16 +0800801/* --------------------------------------------------------------------------
802 Driver Management
803 -------------------------------------------------------------------------- */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804/**
Randy Dunlapd758a8f2006-01-06 01:31:00 -0500805 * acpi_bus_driver_init - add a device to a driver
806 * @device: the device to add and initialize
807 * @driver: driver for the device
808 *
Alex Chiang0c526d92009-05-14 08:31:37 -0600809 * Used to initialize a device via its device driver. Called whenever a
Patrick Mochel1890a972006-12-07 20:56:31 +0800810 * driver is bound to a device. Invokes the driver's add() ops.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 */
812static int
Len Brown4be44fc2005-08-05 00:44:28 -0400813acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814{
Len Brown4be44fc2005-08-05 00:44:28 -0400815 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 if (!device || !driver)
Patrick Mocheld550d982006-06-27 00:41:40 -0400818 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
820 if (!driver->ops.add)
Patrick Mocheld550d982006-06-27 00:41:40 -0400821 return -ENOSYS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822
823 result = driver->ops.add(device);
824 if (result) {
825 device->driver = NULL;
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700826 device->driver_data = NULL;
Patrick Mocheld550d982006-06-27 00:41:40 -0400827 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 }
829
830 device->driver = driver;
831
832 /*
833 * TBD - Configuration Management: Assign resources to device based
834 * upon possible configuration and currently allocated resources.
835 */
836
Len Brown4be44fc2005-08-05 00:44:28 -0400837 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
838 "Driver successfully bound to device\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400839 return 0;
Rajesh Shah3fb02732005-04-28 00:25:52 -0700840}
841
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842/**
Randy Dunlapd758a8f2006-01-06 01:31:00 -0500843 * acpi_bus_register_driver - register a driver with the ACPI bus
844 * @driver: driver being registered
845 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 * Registers a driver with the ACPI bus. Searches the namespace for all
Bjorn Helgaas9d9f7492006-03-28 17:04:00 -0500847 * devices that match the driver's criteria and binds. Returns zero for
848 * success or a negative error status for failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849 */
Len Brown4be44fc2005-08-05 00:44:28 -0400850int acpi_bus_register_driver(struct acpi_driver *driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851{
Patrick Mochel1890a972006-12-07 20:56:31 +0800852 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
854 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400855 return -ENODEV;
Patrick Mochel1890a972006-12-07 20:56:31 +0800856 driver->drv.name = driver->name;
857 driver->drv.bus = &acpi_bus_type;
858 driver->drv.owner = driver->owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859
Patrick Mochel1890a972006-12-07 20:56:31 +0800860 ret = driver_register(&driver->drv);
861 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863
Len Brown4be44fc2005-08-05 00:44:28 -0400864EXPORT_SYMBOL(acpi_bus_register_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865
866/**
Randy Dunlapd758a8f2006-01-06 01:31:00 -0500867 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
868 * @driver: driver to unregister
869 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 * Unregisters a driver with the ACPI bus. Searches the namespace for all
871 * devices that match the driver's criteria and unbinds.
872 */
Bjorn Helgaas06ea8e082006-04-27 05:25:00 -0400873void acpi_bus_unregister_driver(struct acpi_driver *driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874{
Patrick Mochel1890a972006-12-07 20:56:31 +0800875 driver_unregister(&driver->drv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876}
Len Brown4be44fc2005-08-05 00:44:28 -0400877
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878EXPORT_SYMBOL(acpi_bus_unregister_driver);
879
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880/* --------------------------------------------------------------------------
881 Device Enumeration
882 -------------------------------------------------------------------------- */
Bjorn Helgaas5c478f42009-09-21 19:29:35 +0000883static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
884{
885 acpi_status status;
886 int ret;
887 struct acpi_device *device;
888
889 /*
890 * Fixed hardware devices do not appear in the namespace and do not
891 * have handles, but we fabricate acpi_devices for them, so we have
892 * to deal with them specially.
893 */
894 if (handle == NULL)
895 return acpi_root;
896
897 do {
898 status = acpi_get_parent(handle, &handle);
899 if (status == AE_NULL_ENTRY)
900 return NULL;
901 if (ACPI_FAILURE(status))
902 return acpi_root;
903
904 ret = acpi_bus_get_device(handle, &device);
905 if (ret == 0)
906 return device;
907 } while (1);
908}
909
Len Brownc8f7a622006-07-09 17:22:28 -0400910acpi_status
911acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
912{
913 acpi_status status;
914 acpi_handle tmp;
915 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
916 union acpi_object *obj;
917
918 status = acpi_get_handle(handle, "_EJD", &tmp);
919 if (ACPI_FAILURE(status))
920 return status;
921
922 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
923 if (ACPI_SUCCESS(status)) {
924 obj = buffer.pointer;
Holger Macht3b5fee52008-02-14 13:40:34 +0100925 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
926 ejd);
Len Brownc8f7a622006-07-09 17:22:28 -0400927 kfree(buffer.pointer);
928 }
929 return status;
930}
931EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
932
Bob Moore8e4319c2009-06-29 13:43:27 +0800933void acpi_bus_data_handler(acpi_handle handle, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934{
935
936 /* TBD */
937
938 return;
939}
940
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100941static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
942 struct acpi_device_wakeup *wakeup)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943{
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100944 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
945 union acpi_object *package = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 union acpi_object *element = NULL;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100947 acpi_status status;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100948 int err = -ENODATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100950 if (!wakeup)
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100951 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952
Rafael J. Wysocki993cbe52013-01-17 14:11:06 +0100953 INIT_LIST_HEAD(&wakeup->resources);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100955 /* _PRW */
956 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
957 if (ACPI_FAILURE(status)) {
958 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100959 return err;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100960 }
961
962 package = (union acpi_object *)buffer.pointer;
963
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100964 if (!package || package->package.count < 2)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100965 goto out;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100966
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 element = &(package->package.elements[0]);
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100968 if (!element)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100969 goto out;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100970
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 if (element->type == ACPI_TYPE_PACKAGE) {
972 if ((element->package.count < 2) ||
973 (element->package.elements[0].type !=
974 ACPI_TYPE_LOCAL_REFERENCE)
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100975 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100976 goto out;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100977
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100978 wakeup->gpe_device =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 element->package.elements[0].reference.handle;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100980 wakeup->gpe_number =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 (u32) element->package.elements[1].integer.value;
982 } else if (element->type == ACPI_TYPE_INTEGER) {
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100983 wakeup->gpe_device = NULL;
984 wakeup->gpe_number = element->integer.value;
985 } else {
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100986 goto out;
987 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988
989 element = &(package->package.elements[1]);
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100990 if (element->type != ACPI_TYPE_INTEGER)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100991 goto out;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100992
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100993 wakeup->sleep_state = element->integer.value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100995 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
996 if (err)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100997 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998
Rafael J. Wysocki0596a522013-01-17 14:11:07 +0100999 if (!list_empty(&wakeup->resources)) {
1000 int sleep_state;
1001
1002 sleep_state = acpi_power_min_system_level(&wakeup->resources);
1003 if (sleep_state < wakeup->sleep_state) {
1004 acpi_handle_warn(handle, "Overriding _PRW sleep state "
1005 "(S%d) by S%d from power resources\n",
1006 (int)wakeup->sleep_state, sleep_state);
1007 wakeup->sleep_state = sleep_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 }
Lin Mingbba63a22010-12-13 13:39:17 +08001010 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
Rafael J. Wysocki98746472010-07-08 00:43:36 +02001011
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001012 out:
1013 kfree(buffer.pointer);
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001014 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015}
1016
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001017static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018{
Thomas Renninger29b71a12007-07-23 14:43:51 +02001019 struct acpi_device_id button_device_ids[] = {
Thomas Renninger29b71a12007-07-23 14:43:51 +02001020 {"PNP0C0C", 0},
Zhang Ruib7e38302012-12-04 23:23:16 +01001021 {"PNP0C0D", 0},
Thomas Renninger29b71a12007-07-23 14:43:51 +02001022 {"PNP0C0E", 0},
1023 {"", 0},
1024 };
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001025 acpi_status status;
1026 acpi_event_status event_status;
1027
Rafael J. Wysockib67ea762010-02-17 23:44:09 +01001028 device->wakeup.flags.notifier_present = 0;
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001029
1030 /* Power button, Lid switch always enable wakeup */
1031 if (!acpi_match_device_ids(device, button_device_ids)) {
1032 device->wakeup.flags.run_wake = 1;
Zhang Ruib7e38302012-12-04 23:23:16 +01001033 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1034 /* Do not use Lid/sleep button for S5 wakeup */
1035 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1036 device->wakeup.sleep_state = ACPI_STATE_S4;
1037 }
Rafael J. Wysockif2b56bc2011-01-06 23:34:22 +01001038 device_set_wakeup_capable(&device->dev, true);
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001039 return;
1040 }
1041
Rafael J. Wysockie8e18c92010-07-08 00:42:51 +02001042 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1043 device->wakeup.gpe_number,
1044 &event_status);
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001045 if (status == AE_OK)
1046 device->wakeup.flags.run_wake =
1047 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1048}
1049
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001050static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001051{
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001052 acpi_handle temp;
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001053 acpi_status status = 0;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001054 int err;
Thomas Renninger29b71a12007-07-23 14:43:51 +02001055
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001056 /* Presence of _PRW indicates wake capable */
1057 status = acpi_get_handle(device->handle, "_PRW", &temp);
1058 if (ACPI_FAILURE(status))
1059 return;
1060
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001061 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1062 &device->wakeup);
1063 if (err) {
1064 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001065 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 }
1067
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 device->wakeup.flags.valid = 1;
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +02001069 device->wakeup.prepare_count = 0;
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001070 acpi_bus_set_run_wake_flags(device);
Zhao Yakui729b2bd2008-03-19 13:26:54 +08001071 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1072 * system for the ACPI device with the _PRW object.
1073 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1074 * So it is necessary to call _DSW object first. Only when it is not
1075 * present will the _PSW object used.
1076 */
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001077 err = acpi_device_sleep_wake(device, 0, 0, 0);
1078 if (err)
Rafael J. Wysocki77e76602008-07-07 03:33:34 +02001079 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1080 "error in _DSW or _PSW evaluation\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081}
1082
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001083static void acpi_bus_init_power_state(struct acpi_device *device, int state)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084{
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001085 struct acpi_device_power_state *ps = &device->power.states[state];
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001086 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1087 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001088 acpi_handle handle;
1089 acpi_status status;
Zhang Rui9e89dde2006-12-07 20:56:16 +08001090
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001091 INIT_LIST_HEAD(&ps->resources);
1092
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001093 /* Evaluate "_PRx" to get referenced power resources */
1094 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1095 if (ACPI_SUCCESS(status)) {
1096 union acpi_object *package = buffer.pointer;
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001097
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001098 if (buffer.length && package
1099 && package->type == ACPI_TYPE_PACKAGE
1100 && package->package.count) {
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001101 int err = acpi_extract_power_resources(package, 0,
1102 &ps->resources);
1103 if (!err)
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001104 device->power.flags.power_resources = 1;
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001105 }
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001106 ACPI_FREE(buffer.pointer);
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001107 }
1108
1109 /* Evaluate "_PSx" to see if we can do explicit sets */
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001110 pathname[2] = 'S';
1111 status = acpi_get_handle(device->handle, pathname, &handle);
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001112 if (ACPI_SUCCESS(status))
1113 ps->flags.explicit_set = 1;
1114
1115 /*
1116 * State is valid if there are means to put the device into it.
1117 * D3hot is only valid if _PR3 present.
1118 */
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001119 if (!list_empty(&ps->resources)
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001120 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1121 ps->flags.valid = 1;
1122 ps->flags.os_accessible = 1;
1123 }
1124
1125 ps->power = -1; /* Unknown - driver assigned */
1126 ps->latency = -1; /* Unknown - driver assigned */
1127}
1128
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001129static void acpi_bus_get_power_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130{
Rafael J. Wysocki8bc50532013-01-17 14:11:07 +01001131 acpi_status status;
1132 acpi_handle handle;
1133 u32 i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001135 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1136 status = acpi_get_handle(device->handle, "_PS0", &handle);
1137 if (ACPI_FAILURE(status)) {
1138 status = acpi_get_handle(device->handle, "_PR0", &handle);
1139 if (ACPI_FAILURE(status))
1140 return;
1141 }
1142
1143 device->flags.power_manageable = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144
1145 /*
Zhang Rui9e89dde2006-12-07 20:56:16 +08001146 * Power Management Flags
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 */
Zhang Rui9e89dde2006-12-07 20:56:16 +08001148 status = acpi_get_handle(device->handle, "_PSC", &handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 if (ACPI_SUCCESS(status))
Zhang Rui9e89dde2006-12-07 20:56:16 +08001150 device->power.flags.explicit_get = 1;
1151 status = acpi_get_handle(device->handle, "_IRC", &handle);
1152 if (ACPI_SUCCESS(status))
1153 device->power.flags.inrush_current = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154
1155 /*
Zhang Rui9e89dde2006-12-07 20:56:16 +08001156 * Enumerate supported power management states
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 */
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001158 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1159 acpi_bus_init_power_state(device, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160
Rafael J. Wysocki0b224522013-01-17 14:11:06 +01001161 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
Zhang Rui9e89dde2006-12-07 20:56:16 +08001163 /* Set defaults for D0 and D3 states (always valid) */
1164 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1165 device->power.states[ACPI_STATE_D0].power = 100;
1166 device->power.states[ACPI_STATE_D3].flags.valid = 1;
1167 device->power.states[ACPI_STATE_D3].power = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168
Rafael J. Wysocki5c7dd712012-05-18 00:39:35 +02001169 /* Set D3cold's explicit_set flag if _PS3 exists. */
1170 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1171 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1172
Aaron Lu1399dfc2012-11-21 23:33:40 +01001173 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1174 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1175 device->power.flags.power_resources)
1176 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1177
Rafael J. Wysockiade3e7f2010-11-25 00:08:36 +01001178 acpi_bus_init_power(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179}
1180
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001181static void acpi_bus_get_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182{
Len Brown4be44fc2005-08-05 00:44:28 -04001183 acpi_status status = AE_OK;
1184 acpi_handle temp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 /* Presence of _STA indicates 'dynamic_status' */
1187 status = acpi_get_handle(device->handle, "_STA", &temp);
1188 if (ACPI_SUCCESS(status))
1189 device->flags.dynamic_status = 1;
1190
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 /* Presence of _RMV indicates 'removable' */
1192 status = acpi_get_handle(device->handle, "_RMV", &temp);
1193 if (ACPI_SUCCESS(status))
1194 device->flags.removable = 1;
1195
1196 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1197 status = acpi_get_handle(device->handle, "_EJD", &temp);
1198 if (ACPI_SUCCESS(status))
1199 device->flags.ejectable = 1;
1200 else {
1201 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1202 if (ACPI_SUCCESS(status))
1203 device->flags.ejectable = 1;
1204 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205}
1206
Bjorn Helgaasc7bcb4e2009-09-21 19:29:25 +00001207static void acpi_device_get_busid(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208{
Len Brown4be44fc2005-08-05 00:44:28 -04001209 char bus_id[5] = { '?', 0 };
1210 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1211 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212
1213 /*
1214 * Bus ID
1215 * ------
1216 * The device's Bus ID is simply the object name.
1217 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1218 */
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001219 if (ACPI_IS_ROOT_DEVICE(device)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 strcpy(device->pnp.bus_id, "ACPI");
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001221 return;
1222 }
1223
1224 switch (device->device_type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 case ACPI_BUS_TYPE_POWER_BUTTON:
1226 strcpy(device->pnp.bus_id, "PWRF");
1227 break;
1228 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1229 strcpy(device->pnp.bus_id, "SLPF");
1230 break;
1231 default:
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +00001232 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 /* Clean up trailing underscores (if any) */
1234 for (i = 3; i > 1; i--) {
1235 if (bus_id[i] == '_')
1236 bus_id[i] = '\0';
1237 else
1238 break;
1239 }
1240 strcpy(device->pnp.bus_id, bus_id);
1241 break;
1242 }
1243}
1244
Zhang Rui54735262007-01-11 02:09:09 -05001245/*
1246 * acpi_bay_match - see if a device is an ejectable driver bay
1247 *
1248 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1249 * then we can safely call it an ejectable drive bay
1250 */
1251static int acpi_bay_match(struct acpi_device *device){
1252 acpi_status status;
1253 acpi_handle handle;
1254 acpi_handle tmp;
1255 acpi_handle phandle;
1256
1257 handle = device->handle;
1258
1259 status = acpi_get_handle(handle, "_EJ0", &tmp);
1260 if (ACPI_FAILURE(status))
1261 return -ENODEV;
1262
1263 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1264 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1265 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1266 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1267 return 0;
1268
1269 if (acpi_get_parent(handle, &phandle))
1270 return -ENODEV;
1271
1272 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1273 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1274 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1275 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1276 return 0;
1277
1278 return -ENODEV;
1279}
1280
Frank Seidel3620f2f2007-12-07 13:20:34 +01001281/*
1282 * acpi_dock_match - see if a device has a _DCK method
1283 */
1284static int acpi_dock_match(struct acpi_device *device)
1285{
1286 acpi_handle tmp;
1287 return acpi_get_handle(device->handle, "_DCK", &tmp);
1288}
1289
Thomas Renninger620e1122010-10-01 10:54:00 +02001290const char *acpi_device_hid(struct acpi_device *device)
Bob Moore15b8dd52009-06-29 13:39:29 +08001291{
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001292 struct acpi_hardware_id *hid;
Bob Moore15b8dd52009-06-29 13:39:29 +08001293
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +02001294 if (list_empty(&device->pnp.ids))
1295 return dummy_hid;
1296
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001297 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1298 return hid->id;
1299}
1300EXPORT_SYMBOL(acpi_device_hid);
Bob Moore15b8dd52009-06-29 13:39:29 +08001301
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001302static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1303{
1304 struct acpi_hardware_id *id;
Bob Moore15b8dd52009-06-29 13:39:29 +08001305
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001306 id = kmalloc(sizeof(*id), GFP_KERNEL);
1307 if (!id)
1308 return;
Bob Moore15b8dd52009-06-29 13:39:29 +08001309
Thomas Meyer581de592011-08-06 11:32:56 +02001310 id->id = kstrdup(dev_id, GFP_KERNEL);
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001311 if (!id->id) {
1312 kfree(id);
1313 return;
Bob Moore15b8dd52009-06-29 13:39:29 +08001314 }
1315
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001316 list_add_tail(&id->list, &device->pnp.ids);
Bob Moore15b8dd52009-06-29 13:39:29 +08001317}
1318
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001319/*
1320 * Old IBM workstations have a DSDT bug wherein the SMBus object
1321 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1322 * prefix. Work around this.
1323 */
1324static int acpi_ibm_smbus_match(struct acpi_device *device)
1325{
1326 acpi_handle h_dummy;
1327 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1328 int result;
1329
1330 if (!dmi_name_in_vendors("IBM"))
1331 return -ENODEV;
1332
1333 /* Look for SMBS object */
1334 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1335 if (result)
1336 return result;
1337
1338 if (strcmp("SMBS", path.pointer)) {
1339 result = -ENODEV;
1340 goto out;
1341 }
1342
1343 /* Does it have the necessary (but misnamed) methods? */
1344 result = -ENODEV;
1345 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1346 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1347 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1348 result = 0;
1349out:
1350 kfree(path.pointer);
1351 return result;
1352}
1353
Bjorn Helgaasc7bcb4e2009-09-21 19:29:25 +00001354static void acpi_device_set_id(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355{
Len Brown4be44fc2005-08-05 00:44:28 -04001356 acpi_status status;
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001357 struct acpi_device_info *info;
Lv Zheng78e25fe2012-10-31 02:25:24 +00001358 struct acpi_pnp_device_id_list *cid_list;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001359 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360
Bjorn Helgaasc7bcb4e2009-09-21 19:29:25 +00001361 switch (device->device_type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 case ACPI_BUS_TYPE_DEVICE:
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001363 if (ACPI_IS_ROOT_DEVICE(device)) {
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001364 acpi_add_id(device, ACPI_SYSTEM_HID);
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001365 break;
1366 }
1367
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +00001368 status = acpi_get_object_info(device->handle, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 if (ACPI_FAILURE(status)) {
Harvey Harrison96b2dd12008-03-05 18:24:51 -08001370 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 return;
1372 }
1373
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 if (info->valid & ACPI_VALID_HID)
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001375 acpi_add_id(device, info->hardware_id.string);
1376 if (info->valid & ACPI_VALID_CID) {
Bob Moore15b8dd52009-06-29 13:39:29 +08001377 cid_list = &info->compatible_id_list;
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001378 for (i = 0; i < cid_list->count; i++)
1379 acpi_add_id(device, cid_list->ids[i].string);
1380 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 if (info->valid & ACPI_VALID_ADR) {
1382 device->pnp.bus_address = info->address;
1383 device->flags.bus_address = 1;
1384 }
Lv Zhengccf78042012-10-30 14:41:07 +01001385 if (info->valid & ACPI_VALID_UID)
1386 device->pnp.unique_id = kstrdup(info->unique_id.string,
1387 GFP_KERNEL);
Zhang Ruiae843332006-12-07 20:57:10 +08001388
Bjorn Helgaasa83893ae2009-10-02 11:03:12 -04001389 kfree(info);
1390
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001391 /*
1392 * Some devices don't reliably have _HIDs & _CIDs, so add
1393 * synthetic HIDs to make sure drivers can find them.
1394 */
Thomas Renningerc3d6de62008-08-01 17:37:55 +02001395 if (acpi_is_video_device(device))
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001396 acpi_add_id(device, ACPI_VIDEO_HID);
Frank Seidel3620f2f2007-12-07 13:20:34 +01001397 else if (ACPI_SUCCESS(acpi_bay_match(device)))
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001398 acpi_add_id(device, ACPI_BAY_HID);
Frank Seidel3620f2f2007-12-07 13:20:34 +01001399 else if (ACPI_SUCCESS(acpi_dock_match(device)))
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001400 acpi_add_id(device, ACPI_DOCK_HID);
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001401 else if (!acpi_ibm_smbus_match(device))
1402 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
Rafael J. Wysocki4f5f64c2013-01-04 23:00:54 +01001403 else if (list_empty(&device->pnp.ids) &&
Bjorn Helgaasb7b30de2010-03-24 10:44:33 -06001404 ACPI_IS_ROOT_DEVICE(device->parent)) {
1405 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1406 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1407 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1408 }
Zhang Rui54735262007-01-11 02:09:09 -05001409
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 break;
1411 case ACPI_BUS_TYPE_POWER:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001412 acpi_add_id(device, ACPI_POWER_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413 break;
1414 case ACPI_BUS_TYPE_PROCESSOR:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001415 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417 case ACPI_BUS_TYPE_THERMAL:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001418 acpi_add_id(device, ACPI_THERMAL_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 break;
1420 case ACPI_BUS_TYPE_POWER_BUTTON:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001421 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 break;
1423 case ACPI_BUS_TYPE_SLEEP_BUTTON:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001424 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 break;
1426 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427}
1428
Rafael J. Wysocki82c7d5e2013-01-17 14:11:05 +01001429void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1430 int type, unsigned long long sta)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431{
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001432 INIT_LIST_HEAD(&device->pnp.ids);
1433 device->device_type = type;
1434 device->handle = handle;
1435 device->parent = acpi_bus_get_parent(handle);
1436 STRUCT_TO_INT(device->status) = sta;
1437 acpi_device_get_busid(device);
1438 acpi_device_set_id(device);
1439 acpi_bus_get_flags(device);
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001440 device->flags.match_driver = false;
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001441 device_initialize(&device->dev);
1442 dev_set_uevent_suppress(&device->dev, true);
1443}
Bjorn Helgaasbc3b0772009-09-21 19:29:20 +00001444
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001445void acpi_device_add_finalize(struct acpi_device *device)
1446{
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001447 device->flags.match_driver = true;
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001448 dev_set_uevent_suppress(&device->dev, false);
1449 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450}
1451
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001452static int acpi_add_single_object(struct acpi_device **child,
1453 acpi_handle handle, int type,
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001454 unsigned long long sta)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455{
Bjorn Helgaas77c24882009-09-21 19:29:30 +00001456 int result;
1457 struct acpi_device *device;
Bjorn Helgaas29aaefa2009-09-21 19:28:54 +00001458 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459
Burman Yan36bcbec2006-12-19 12:56:11 -08001460 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 if (!device) {
Len Brown64684632006-06-26 23:41:38 -04001462 printk(KERN_ERR PREFIX "Memory allocation error\n");
Patrick Mocheld550d982006-06-27 00:41:40 -04001463 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001466 acpi_init_device_object(device, handle, type, sta);
1467 acpi_bus_get_power_flags(device);
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001468 acpi_bus_get_wakeup_device_flags(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001470 result = acpi_device_add(device, acpi_device_release);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001471 if (result) {
Hugh Dickins718fb0d2009-08-06 23:18:12 +00001472 acpi_device_release(&device->dev);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001473 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474 }
1475
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001476 acpi_power_add_remove_device(device, true);
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001477 acpi_device_add_finalize(device);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001478 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1479 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1480 dev_name(&device->dev), (char *) buffer.pointer,
1481 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1482 kfree(buffer.pointer);
1483 *child = device;
1484 return 0;
Rafael J. Wysockibf325f92010-11-25 00:10:44 +01001485}
1486
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001487static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1488 unsigned long long *sta)
1489{
1490 acpi_status status;
1491 acpi_object_type acpi_type;
1492
1493 status = acpi_get_type(handle, &acpi_type);
1494 if (ACPI_FAILURE(status))
1495 return -ENODEV;
1496
1497 switch (acpi_type) {
1498 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1499 case ACPI_TYPE_DEVICE:
1500 *type = ACPI_BUS_TYPE_DEVICE;
1501 status = acpi_bus_get_status_handle(handle, sta);
1502 if (ACPI_FAILURE(status))
1503 return -ENODEV;
1504 break;
1505 case ACPI_TYPE_PROCESSOR:
1506 *type = ACPI_BUS_TYPE_PROCESSOR;
1507 status = acpi_bus_get_status_handle(handle, sta);
1508 if (ACPI_FAILURE(status))
1509 return -ENODEV;
1510 break;
1511 case ACPI_TYPE_THERMAL:
1512 *type = ACPI_BUS_TYPE_THERMAL;
1513 *sta = ACPI_STA_DEFAULT;
1514 break;
1515 case ACPI_TYPE_POWER:
1516 *type = ACPI_BUS_TYPE_POWER;
1517 *sta = ACPI_STA_DEFAULT;
1518 break;
1519 default:
1520 return -ENODEV;
1521 }
1522
1523 return 0;
1524}
1525
Rafael J. Wysockie3863092012-12-21 00:36:47 +01001526static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1527 void *not_used, void **return_value)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528{
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001529 struct acpi_device *device = NULL;
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001530 int type;
1531 unsigned long long sta;
Bjorn Helgaase3b87f82009-09-21 19:30:11 +00001532 acpi_status status;
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001533 int result;
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001534
Rafael J. Wysocki4002bf32012-12-21 00:36:44 +01001535 acpi_bus_get_device(handle, &device);
1536 if (device)
1537 goto out;
1538
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001539 result = acpi_bus_type_and_status(handle, &type, &sta);
1540 if (result)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001541 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542
Rafael J. Wysocki82c7d5e2013-01-17 14:11:05 +01001543 if (type == ACPI_BUS_TYPE_POWER) {
1544 acpi_add_power_resource(handle);
1545 return AE_OK;
1546 }
1547
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001548 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001549 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
Rafael J. Wysocki86e4e202011-01-06 23:40:00 +01001550 struct acpi_device_wakeup wakeup;
1551 acpi_handle temp;
1552
1553 status = acpi_get_handle(handle, "_PRW", &temp);
Rafael J. Wysocki993cbe52013-01-17 14:11:06 +01001554 if (ACPI_SUCCESS(status)) {
Rafael J. Wysocki86e4e202011-01-06 23:40:00 +01001555 acpi_bus_extract_wakeup_device_power_package(handle,
1556 &wakeup);
Rafael J. Wysocki993cbe52013-01-17 14:11:06 +01001557 acpi_power_resources_list_free(&wakeup.resources);
1558 }
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001559 return AE_CTRL_DEPTH;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001560 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001562 acpi_add_single_object(&device, handle, type, sta);
Bjorn Helgaase3b87f82009-09-21 19:30:11 +00001563 if (!device)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001564 return AE_CTRL_DEPTH;
1565
Rafael J. Wysocki4002bf32012-12-21 00:36:44 +01001566 out:
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001567 if (!*return_value)
1568 *return_value = device;
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001569
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001570 return AE_OK;
1571}
1572
Rafael J. Wysocki0fc300b2012-12-21 00:36:41 +01001573static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1574 void *not_used, void **ret_not_used)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001575{
Mika Westerberge3753252013-01-18 13:46:01 +00001576 const struct acpi_device_id *id;
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001577 acpi_status status = AE_OK;
1578 struct acpi_device *device;
1579 unsigned long long sta_not_used;
1580 int type_not_used;
1581
1582 /*
1583 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1584 * namespace walks prematurely.
1585 */
1586 if (acpi_bus_type_and_status(handle, &type_not_used, &sta_not_used))
1587 return AE_OK;
1588
1589 if (acpi_bus_get_device(handle, &device))
1590 return AE_CTRL_DEPTH;
1591
Mika Westerberge3753252013-01-18 13:46:01 +00001592 id = __acpi_match_device(device, acpi_platform_device_ids);
1593 if (id) {
Rafael J. Wysocki0fc300b2012-12-21 00:36:41 +01001594 /* This is a known good platform device. */
Mika Westerberge3753252013-01-18 13:46:01 +00001595 acpi_create_platform_device(device, id->driver_data);
Mika Westerbergabe99212013-01-11 22:08:09 +01001596 } else if (device_attach(&device->dev) < 0) {
Rafael J. Wysocki0fc300b2012-12-21 00:36:41 +01001597 status = AE_CTRL_DEPTH;
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001598 }
1599 return status;
1600}
1601
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01001602/**
1603 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1604 * @handle: Root of the namespace scope to scan.
1605 *
1606 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1607 * found devices.
1608 *
1609 * If no devices were found, -ENODEV is returned, but it does not mean that
1610 * there has been a real error. There just have been no suitable ACPI objects
1611 * in the table trunk from which the kernel could create a device and add an
1612 * appropriate driver.
1613 */
1614int acpi_bus_scan(acpi_handle handle)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001615{
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001616 void *device = NULL;
Rafael J. Wysockic511cc12013-01-27 21:17:29 +01001617 int error = 0;
1618
1619 mutex_lock(&acpi_scan_lock);
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001620
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001621 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001622 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
Rafael J. Wysockie3863092012-12-21 00:36:47 +01001623 acpi_bus_check_add, NULL, NULL, &device);
Rajesh Shah3fb02732005-04-28 00:25:52 -07001624
Thomas Renningerd2f66502010-01-29 17:48:51 +01001625 if (!device)
Rafael J. Wysockic511cc12013-01-27 21:17:29 +01001626 error = -ENODEV;
1627 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001628 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
Rafael J. Wysocki0fc300b2012-12-21 00:36:41 +01001629 acpi_bus_device_attach, NULL, NULL, NULL);
Rajesh Shah3fb02732005-04-28 00:25:52 -07001630
Rafael J. Wysockic511cc12013-01-27 21:17:29 +01001631 mutex_unlock(&acpi_scan_lock);
1632 return error;
Rajesh Shah3fb02732005-04-28 00:25:52 -07001633}
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01001634EXPORT_SYMBOL(acpi_bus_scan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001636static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1637 void *not_used, void **ret_not_used)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001638{
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001639 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001640
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001641 if (!acpi_bus_get_device(handle, &device)) {
1642 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1643 device_release_driver(&device->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001644 }
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001645 return AE_OK;
1646}
1647
1648static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1649 void *not_used, void **ret_not_used)
1650{
1651 struct acpi_device *device = NULL;
1652
1653 if (!acpi_bus_get_device(handle, &device))
1654 acpi_device_unregister(device);
1655
1656 return AE_OK;
1657}
1658
Rafael J. Wysockibfee26d2013-01-26 00:27:44 +01001659void acpi_bus_trim(struct acpi_device *start)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660{
Rafael J. Wysockic511cc12013-01-27 21:17:29 +01001661 mutex_lock(&acpi_scan_lock);
1662
Rafael J. Wysockicecdb192013-01-15 13:24:02 +01001663 /*
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001664 * Execute acpi_bus_device_detach() as a post-order callback to detach
1665 * all ACPI drivers from the device nodes being removed.
1666 */
1667 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1668 acpi_bus_device_detach, NULL, NULL);
1669 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1670 /*
Rafael J. Wysockicecdb192013-01-15 13:24:02 +01001671 * Execute acpi_bus_remove() as a post-order callback to remove device
1672 * nodes in the given namespace scope.
1673 */
1674 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1675 acpi_bus_remove, NULL, NULL);
1676 acpi_bus_remove(start->handle, 0, NULL, NULL);
Rafael J. Wysockic511cc12013-01-27 21:17:29 +01001677
1678 mutex_unlock(&acpi_scan_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679}
Kristen Accardiceaba662006-02-23 17:56:01 -08001680EXPORT_SYMBOL_GPL(acpi_bus_trim);
1681
Bjorn Helgaase8b945c2009-09-21 19:28:59 +00001682static int acpi_bus_scan_fixed(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683{
Len Brown4be44fc2005-08-05 00:44:28 -04001684 int result = 0;
Li Shaohuac4168bf2006-12-07 20:56:41 +08001685
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686 /*
1687 * Enumerate all fixed-feature devices.
1688 */
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001689 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1690 struct acpi_device *device = NULL;
1691
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001692 result = acpi_add_single_object(&device, NULL,
Li Shaohuac4168bf2006-12-07 20:56:41 +08001693 ACPI_BUS_TYPE_POWER_BUTTON,
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001694 ACPI_STA_DEFAULT);
1695 if (result)
1696 return result;
1697
1698 result = device_attach(&device->dev);
1699 if (result < 0)
1700 return result;
1701
Daniel Drakec10d7a12012-05-10 00:08:43 +01001702 device_init_wakeup(&device->dev, true);
Rajesh Shah3fb02732005-04-28 00:25:52 -07001703 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001705 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1706 struct acpi_device *device = NULL;
1707
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001708 result = acpi_add_single_object(&device, NULL,
Li Shaohuac4168bf2006-12-07 20:56:41 +08001709 ACPI_BUS_TYPE_SLEEP_BUTTON,
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001710 ACPI_STA_DEFAULT);
1711 if (result)
1712 return result;
1713
1714 result = device_attach(&device->dev);
Rajesh Shah3fb02732005-04-28 00:25:52 -07001715 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001717 return result < 0 ? result : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001718}
1719
Bjorn Helgaase747f272009-03-24 16:49:43 -06001720int __init acpi_scan_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721{
1722 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723
Patrick Mochel5b327262006-05-10 10:33:00 -04001724 result = bus_register(&acpi_bus_type);
1725 if (result) {
1726 /* We don't want to quit even if we failed to add suspend/resume */
1727 printk(KERN_ERR PREFIX "Could not register bus type\n");
1728 }
1729
Rafael J. Wysocki92ef2a22012-12-21 00:36:40 +01001730 acpi_pci_root_init();
Mika Westerberg13176bb2013-01-17 09:59:33 +00001731 acpi_csrt_init();
Rafael J. Wysocki97d9a9e2010-11-25 00:10:02 +01001732
Linus Torvalds1da177e2005-04-16 15:20:36 -07001733 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734 * Enumerate devices in the ACPI namespace.
1735 */
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001736 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737 if (result)
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001738 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001740 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741 if (result)
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01001742 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01001744 result = acpi_bus_scan_fixed();
1745 if (result) {
1746 acpi_device_unregister(acpi_root);
1747 return result;
1748 }
1749
1750 acpi_update_all_gpes();
1751 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752}