blob: a48b6e92f9f815afb87f29ca4dfbc94f5f24a9bc [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * scan.c - support for transforming the ACPI namespace into individual objects
3 */
4
5#include <linux/module.h>
6#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09007#include <linux/slab.h>
Randy Dunlap9b6d97b2006-07-12 02:08:00 -04008#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/acpi.h>
Alok N Kataria74523c92008-06-13 12:54:24 -040010#include <linux/signal.h>
11#include <linux/kthread.h>
Darrick J. Wong222e82a2010-03-24 14:38:37 +010012#include <linux/dmi.h>
Lance Ortizd1efe3c2012-10-02 12:43:23 -060013#include <linux/nls.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
15#include <acpi/acpi_drivers.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
Bjorn Helgaase60cc7a2009-03-13 12:08:26 -060017#include "internal.h"
18
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#define _COMPONENT ACPI_BUS_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050020ACPI_MODULE_NAME("scan");
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#define STRUCT_TO_INT(s) (*((int*)&s))
Len Brown4be44fc2005-08-05 00:44:28 -040022extern struct acpi_device *acpi_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24#define ACPI_BUS_CLASS "system_bus"
Thomas Renninger29b71a12007-07-23 14:43:51 +020025#define ACPI_BUS_HID "LNXSYBUS"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#define ACPI_BUS_DEVICE_NAME "System Bus"
27
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +000028#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
29
Thomas Renninger620e1122010-10-01 10:54:00 +020030static const char *dummy_hid = "device";
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +020031
Linus Torvalds1da177e2005-04-16 15:20:36 -070032static LIST_HEAD(acpi_device_list);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +080033static LIST_HEAD(acpi_bus_id_list);
Rafael J. Wysockic511cc12013-01-27 21:17:29 +010034static DEFINE_MUTEX(acpi_scan_lock);
Rafael J. Wysockica589f92013-01-30 14:27:29 +010035static LIST_HEAD(acpi_scan_handlers_list);
Shaohua Li90905892009-04-07 10:24:29 +080036DEFINE_MUTEX(acpi_device_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037LIST_HEAD(acpi_wakeup_device_list);
38
Zhang Ruie49bd2dd2006-12-08 17:23:43 +080039struct acpi_device_bus_id{
Zhang Ruibb095852007-01-04 15:03:18 +080040 char bus_id[15];
Zhang Ruie49bd2dd2006-12-08 17:23:43 +080041 unsigned int instance_no;
42 struct list_head node;
43};
Thomas Renninger29b71a12007-07-23 14:43:51 +020044
Rafael J. Wysockica589f92013-01-30 14:27:29 +010045int acpi_scan_add_handler(struct acpi_scan_handler *handler)
46{
47 if (!handler || !handler->attach)
48 return -EINVAL;
49
50 list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
51 return 0;
52}
53
Thomas Renninger29b71a12007-07-23 14:43:51 +020054/*
55 * Creates hid/cid(s) string needed for modalias and uevent
56 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
57 * char *modalias: "acpi:IBM0001:ACPI0001"
58*/
Adrian Bunkb3e572d2007-08-14 23:22:35 +020059static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
60 int size)
61{
Thomas Renninger29b71a12007-07-23 14:43:51 +020062 int len;
Zhang Rui5c9fcb52008-03-20 16:40:32 +080063 int count;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -060064 struct acpi_hardware_id *id;
Thomas Renninger29b71a12007-07-23 14:43:51 +020065
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +020066 if (list_empty(&acpi_dev->pnp.ids))
67 return 0;
68
Zhang Rui5c9fcb52008-03-20 16:40:32 +080069 len = snprintf(modalias, size, "acpi:");
Thomas Renninger29b71a12007-07-23 14:43:51 +020070 size -= len;
71
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -060072 list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
73 count = snprintf(&modalias[len], size, "%s:", id->id);
Zhang Rui5c9fcb52008-03-20 16:40:32 +080074 if (count < 0 || count >= size)
75 return -EINVAL;
76 len += count;
77 size -= count;
78 }
79
Thomas Renninger29b71a12007-07-23 14:43:51 +020080 modalias[len] = '\0';
81 return len;
82}
83
84static ssize_t
85acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
86 struct acpi_device *acpi_dev = to_acpi_device(dev);
87 int len;
88
89 /* Device has no HID and no CID or string is >1024 */
90 len = create_modalias(acpi_dev, buf, 1024);
91 if (len <= 0)
92 return 0;
93 buf[len++] = '\n';
94 return len;
95}
96static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
97
Toshi Kanic4753e52012-05-23 20:25:20 -060098/**
99 * acpi_bus_hot_remove_device: hot-remove a device and its children
100 * @context: struct acpi_eject_event pointer (freed in this func)
101 *
102 * Hot-remove a device and its children. This function frees up the
103 * memory space passed by arg context, so that the caller may call
104 * this function asynchronously through acpi_os_hotplug_execute().
105 */
106void acpi_bus_hot_remove_device(void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107{
Toshi Kanic4753e52012-05-23 20:25:20 -0600108 struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
Yinghai Lu5993c462013-01-11 22:40:41 +0000109 struct acpi_device *device = ej_event->device;
110 acpi_handle handle = device->handle;
Toshi Kanib3c450c2012-10-26 13:38:57 +0200111 acpi_handle temp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 struct acpi_object_list arg_list;
113 union acpi_object arg;
114 acpi_status status = AE_OK;
Toshi Kanic4753e52012-05-23 20:25:20 -0600115 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Zhang Rui26d46862008-04-29 02:35:48 -0400117 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Kay Sievers07944692008-10-30 01:18:59 +0100118 "Hot-removing device %s...\n", dev_name(&device->dev)));
Zhang Rui26d46862008-04-29 02:35:48 -0400119
Rafael J. Wysockibfee26d2013-01-26 00:27:44 +0100120 acpi_bus_trim(device);
121 /* Device node has been released. */
Toshi Kanib3c450c2012-10-26 13:38:57 +0200122 device = NULL;
123
Zhang Rui26d46862008-04-29 02:35:48 -0400124 /* power off device */
125 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
126 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
Lin Ming55ac9a02008-09-28 14:51:56 +0800127 printk(KERN_WARNING PREFIX
128 "Power-off device failed\n");
Zhang Rui26d46862008-04-29 02:35:48 -0400129
Toshi Kanib3c450c2012-10-26 13:38:57 +0200130 if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 arg_list.count = 1;
132 arg_list.pointer = &arg;
133 arg.type = ACPI_TYPE_INTEGER;
134 arg.integer.value = 0;
135 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
136 }
137
138 arg_list.count = 1;
139 arg_list.pointer = &arg;
140 arg.type = ACPI_TYPE_INTEGER;
141 arg.integer.value = 1;
142
143 /*
144 * TBD: _EJD support.
145 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
Toshi Kanic4753e52012-05-23 20:25:20 -0600147 if (ACPI_FAILURE(status)) {
148 if (status != AE_NOT_FOUND)
149 printk(KERN_WARNING PREFIX
150 "Eject device failed\n");
151 goto err_out;
152 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Toshi Kanic4753e52012-05-23 20:25:20 -0600154 kfree(context);
155 return;
156
157err_out:
158 /* Inform firmware the hot-remove operation has completed w/ error */
159 (void) acpi_evaluate_hotplug_ost(handle,
160 ej_event->event, ost_code, NULL);
161 kfree(context);
Zhang Ruic8d72a52009-06-22 11:31:16 +0800162 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163}
Toshi Kani61622ac2012-11-01 14:42:12 +0000164EXPORT_SYMBOL(acpi_bus_hot_remove_device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
Rafael J. Wysocki836aedb2013-01-24 12:49:59 +0100166static ssize_t real_power_state_show(struct device *dev,
167 struct device_attribute *attr, char *buf)
168{
169 struct acpi_device *adev = to_acpi_device(dev);
170 int state;
171 int ret;
172
173 ret = acpi_device_get_power(adev, &state);
174 if (ret)
175 return ret;
176
177 return sprintf(buf, "%s\n", acpi_power_state_string(state));
178}
179
180static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
181
182static ssize_t power_state_show(struct device *dev,
183 struct device_attribute *attr, char *buf)
184{
185 struct acpi_device *adev = to_acpi_device(dev);
186
187 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
188}
189
190static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192static ssize_t
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800193acpi_eject_store(struct device *d, struct device_attribute *attr,
194 const char *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195{
Len Brown4be44fc2005-08-05 00:44:28 -0400196 int ret = count;
Len Brown4be44fc2005-08-05 00:44:28 -0400197 acpi_status status;
Len Brown4be44fc2005-08-05 00:44:28 -0400198 acpi_object_type type = 0;
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800199 struct acpi_device *acpi_device = to_acpi_device(d);
Toshi Kanic4753e52012-05-23 20:25:20 -0600200 struct acpi_eject_event *ej_event;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
202 if ((!count) || (buf[0] != '1')) {
203 return -EINVAL;
204 }
Toshi Kanice7685a2013-02-07 12:50:53 +0100205 if (!acpi_device->driver && !acpi_device->handler) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 ret = -ENODEV;
207 goto err;
208 }
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800209 status = acpi_get_type(acpi_device->handle, &type);
210 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 ret = -ENODEV;
212 goto err;
213 }
214
Toshi Kanic4753e52012-05-23 20:25:20 -0600215 ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
216 if (!ej_event) {
217 ret = -ENOMEM;
218 goto err;
219 }
220
Yinghai Lu5993c462013-01-11 22:40:41 +0000221 ej_event->device = acpi_device;
Toshi Kanic4753e52012-05-23 20:25:20 -0600222 if (acpi_device->flags.eject_pending) {
223 /* event originated from ACPI eject notification */
224 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
225 acpi_device->flags.eject_pending = 0;
226 } else {
227 /* event originated from user */
228 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
Yinghai Lu5993c462013-01-11 22:40:41 +0000229 (void) acpi_evaluate_hotplug_ost(acpi_device->handle,
Toshi Kanic4753e52012-05-23 20:25:20 -0600230 ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
231 }
232
233 acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
Alok N Kataria74523c92008-06-13 12:54:24 -0400234err:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236}
237
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800238static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800240static ssize_t
241acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
242 struct acpi_device *acpi_dev = to_acpi_device(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243
Bjorn Helgaasea8d82f2009-09-21 13:35:09 -0600244 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800245}
246static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
247
Lv Zheng923d4a42012-10-30 14:43:26 +0100248static ssize_t acpi_device_uid_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, "%s\n", acpi_dev->pnp.unique_id);
254}
255static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
256
257static ssize_t acpi_device_adr_show(struct device *dev,
258 struct device_attribute *attr, char *buf)
259{
260 struct acpi_device *acpi_dev = to_acpi_device(dev);
261
262 return sprintf(buf, "0x%08x\n",
263 (unsigned int)(acpi_dev->pnp.bus_address));
264}
265static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
266
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800267static ssize_t
268acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
269 struct acpi_device *acpi_dev = to_acpi_device(dev);
270 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
271 int result;
272
273 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
Alex Chiang0c526d92009-05-14 08:31:37 -0600274 if (result)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800275 goto end;
276
277 result = sprintf(buf, "%s\n", (char*)path.pointer);
278 kfree(path.pointer);
Alex Chiang0c526d92009-05-14 08:31:37 -0600279end:
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800280 return result;
281}
282static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
283
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600284/* sysfs file that shows description text from the ACPI _STR method */
285static ssize_t description_show(struct device *dev,
286 struct device_attribute *attr,
287 char *buf) {
288 struct acpi_device *acpi_dev = to_acpi_device(dev);
289 int result;
290
291 if (acpi_dev->pnp.str_obj == NULL)
292 return 0;
293
294 /*
295 * The _STR object contains a Unicode identifier for a device.
296 * We need to convert to utf-8 so it can be displayed.
297 */
298 result = utf16s_to_utf8s(
299 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
300 acpi_dev->pnp.str_obj->buffer.length,
301 UTF16_LITTLE_ENDIAN, buf,
302 PAGE_SIZE);
303
304 buf[result++] = '\n';
305
306 return result;
307}
308static DEVICE_ATTR(description, 0444, description_show, NULL);
309
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100310static ssize_t
311acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
312 char *buf) {
313 struct acpi_device *acpi_dev = to_acpi_device(dev);
314
315 return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
316}
317static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
318
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800319static int acpi_device_setup_files(struct acpi_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320{
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600321 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800322 acpi_status status;
323 acpi_handle temp;
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100324 unsigned long long sun;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800325 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800327 /*
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800328 * Devices gotten from FADT don't have a "path" attribute
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800329 */
Alex Chiang0c526d92009-05-14 08:31:37 -0600330 if (dev->handle) {
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800331 result = device_create_file(&dev->dev, &dev_attr_path);
Alex Chiang0c526d92009-05-14 08:31:37 -0600332 if (result)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800333 goto end;
334 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200336 if (!list_empty(&dev->pnp.ids)) {
337 result = device_create_file(&dev->dev, &dev_attr_hid);
338 if (result)
339 goto end;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200341 result = device_create_file(&dev->dev, &dev_attr_modalias);
342 if (result)
343 goto end;
344 }
Thomas Renninger29b71a12007-07-23 14:43:51 +0200345
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600346 /*
347 * If device has _STR, 'description' file is created
348 */
349 status = acpi_get_handle(dev->handle, "_STR", &temp);
350 if (ACPI_SUCCESS(status)) {
351 status = acpi_evaluate_object(dev->handle, "_STR",
352 NULL, &buffer);
353 if (ACPI_FAILURE(status))
354 buffer.pointer = NULL;
355 dev->pnp.str_obj = buffer.pointer;
356 result = device_create_file(&dev->dev, &dev_attr_description);
357 if (result)
358 goto end;
359 }
360
Lv Zheng923d4a42012-10-30 14:43:26 +0100361 if (dev->flags.bus_address)
362 result = device_create_file(&dev->dev, &dev_attr_adr);
363 if (dev->pnp.unique_id)
364 result = device_create_file(&dev->dev, &dev_attr_uid);
365
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100366 status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
367 if (ACPI_SUCCESS(status)) {
368 dev->pnp.sun = (unsigned long)sun;
369 result = device_create_file(&dev->dev, &dev_attr_sun);
370 if (result)
371 goto end;
372 } else {
373 dev->pnp.sun = (unsigned long)-1;
374 }
375
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800376 /*
377 * If device has _EJ0, 'eject' file is created that is used to trigger
378 * hot-removal function from userland.
379 */
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800380 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
Rafael J. Wysocki836aedb2013-01-24 12:49:59 +0100381 if (ACPI_SUCCESS(status)) {
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800382 result = device_create_file(&dev->dev, &dev_attr_eject);
Rafael J. Wysocki836aedb2013-01-24 12:49:59 +0100383 if (result)
384 return result;
385 }
386
387 if (dev->flags.power_manageable) {
388 result = device_create_file(&dev->dev, &dev_attr_power_state);
389 if (result)
390 return result;
391
392 if (dev->power.flags.power_resources)
393 result = device_create_file(&dev->dev,
394 &dev_attr_real_power_state);
395 }
396
Alex Chiang0c526d92009-05-14 08:31:37 -0600397end:
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800398 return result;
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800399}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800401static void acpi_device_remove_files(struct acpi_device *dev)
402{
403 acpi_status status;
404 acpi_handle temp;
405
Rafael J. Wysocki836aedb2013-01-24 12:49:59 +0100406 if (dev->flags.power_manageable) {
407 device_remove_file(&dev->dev, &dev_attr_power_state);
408 if (dev->power.flags.power_resources)
409 device_remove_file(&dev->dev,
410 &dev_attr_real_power_state);
411 }
412
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800413 /*
Lance Ortizd1efe3c2012-10-02 12:43:23 -0600414 * If device has _STR, remove 'description' file
415 */
416 status = acpi_get_handle(dev->handle, "_STR", &temp);
417 if (ACPI_SUCCESS(status)) {
418 kfree(dev->pnp.str_obj);
419 device_remove_file(&dev->dev, &dev_attr_description);
420 }
421 /*
422 * If device has _EJ0, remove 'eject' file.
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800423 */
424 status = acpi_get_handle(dev->handle, "_EJ0", &temp);
425 if (ACPI_SUCCESS(status))
426 device_remove_file(&dev->dev, &dev_attr_eject);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800427
Yasuaki Ishimatsubb74ac22012-11-16 02:56:59 +0100428 status = acpi_get_handle(dev->handle, "_SUN", &temp);
429 if (ACPI_SUCCESS(status))
430 device_remove_file(&dev->dev, &dev_attr_sun);
431
Lv Zheng923d4a42012-10-30 14:43:26 +0100432 if (dev->pnp.unique_id)
433 device_remove_file(&dev->dev, &dev_attr_uid);
434 if (dev->flags.bus_address)
435 device_remove_file(&dev->dev, &dev_attr_adr);
Bjorn Helgaas1131b932009-09-21 13:35:29 -0600436 device_remove_file(&dev->dev, &dev_attr_modalias);
437 device_remove_file(&dev->dev, &dev_attr_hid);
Alex Chiang0c526d92009-05-14 08:31:37 -0600438 if (dev->handle)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800439 device_remove_file(&dev->dev, &dev_attr_path);
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800440}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441/* --------------------------------------------------------------------------
Zhang Rui9e89dde2006-12-07 20:56:16 +0800442 ACPI Bus operations
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 -------------------------------------------------------------------------- */
Thomas Renninger29b71a12007-07-23 14:43:51 +0200444
Mika Westerbergcf761af2012-10-31 22:44:41 +0100445static const struct acpi_device_id *__acpi_match_device(
446 struct acpi_device *device, const struct acpi_device_id *ids)
Thomas Renninger29b71a12007-07-23 14:43:51 +0200447{
448 const struct acpi_device_id *id;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600449 struct acpi_hardware_id *hwid;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200450
Zhao Yakui39a0ad82008-08-11 13:40:22 +0800451 /*
452 * If the device is not present, it is unnecessary to load device
453 * driver for it.
454 */
455 if (!device->status.present)
Mika Westerbergcf761af2012-10-31 22:44:41 +0100456 return NULL;
Zhao Yakui39a0ad82008-08-11 13:40:22 +0800457
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600458 for (id = ids; id->id[0]; id++)
459 list_for_each_entry(hwid, &device->pnp.ids, list)
460 if (!strcmp((char *) id->id, hwid->id))
Mika Westerbergcf761af2012-10-31 22:44:41 +0100461 return id;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200462
Mika Westerbergcf761af2012-10-31 22:44:41 +0100463 return NULL;
464}
465
466/**
467 * acpi_match_device - Match a struct device against a given list of ACPI IDs
468 * @ids: Array of struct acpi_device_id object to match against.
469 * @dev: The device structure to match.
470 *
471 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
472 * object for that handle and use that object to match against a given list of
473 * device IDs.
474 *
475 * Return a pointer to the first matching ID on success or %NULL on failure.
476 */
477const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
478 const struct device *dev)
479{
480 struct acpi_device *adev;
481
Rafael J. Wysocki95f8a082012-11-21 00:21:50 +0100482 if (!ids || !ACPI_HANDLE(dev)
483 || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
Mika Westerbergcf761af2012-10-31 22:44:41 +0100484 return NULL;
485
486 return __acpi_match_device(adev, ids);
487}
488EXPORT_SYMBOL_GPL(acpi_match_device);
489
490int acpi_match_device_ids(struct acpi_device *device,
491 const struct acpi_device_id *ids)
492{
493 return __acpi_match_device(device, ids) ? 0 : -ENOENT;
Thomas Renninger29b71a12007-07-23 14:43:51 +0200494}
495EXPORT_SYMBOL(acpi_match_device_ids);
496
Rafael J. Wysocki82c7d5e2013-01-17 14:11:05 +0100497void acpi_free_ids(struct acpi_device *device)
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600498{
499 struct acpi_hardware_id *id, *tmp;
500
501 list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
502 kfree(id->id);
503 kfree(id);
504 }
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100505 kfree(device->pnp.unique_id);
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600506}
507
Rafael J. Wysocki0b224522013-01-17 14:11:06 +0100508static void acpi_free_power_resources_lists(struct acpi_device *device)
509{
510 int i;
511
Rafael J. Wysocki993cbe52013-01-17 14:11:06 +0100512 if (device->wakeup.flags.valid)
513 acpi_power_resources_list_free(&device->wakeup.resources);
514
Rafael J. Wysocki0b224522013-01-17 14:11:06 +0100515 if (!device->flags.power_manageable)
516 return;
517
518 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
519 struct acpi_device_power_state *ps = &device->power.states[i];
520 acpi_power_resources_list_free(&ps->resources);
521 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522}
523
Patrick Mochel1890a972006-12-07 20:56:31 +0800524static void acpi_device_release(struct device *dev)
525{
526 struct acpi_device *acpi_dev = to_acpi_device(dev);
527
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -0600528 acpi_free_ids(acpi_dev);
Rafael J. Wysocki0b224522013-01-17 14:11:06 +0100529 acpi_free_power_resources_lists(acpi_dev);
Patrick Mochel1890a972006-12-07 20:56:31 +0800530 kfree(acpi_dev);
531}
532
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800533static int acpi_bus_match(struct device *dev, struct device_driver *drv)
534{
535 struct acpi_device *acpi_dev = to_acpi_device(dev);
536 struct acpi_driver *acpi_drv = to_acpi_driver(drv);
537
Rafael J. Wysocki209d3b12012-12-21 00:36:48 +0100538 return acpi_dev->flags.match_driver
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +0100539 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800540}
541
Kay Sievers7eff2e72007-08-14 15:15:12 +0200542static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800543{
544 struct acpi_device *acpi_dev = to_acpi_device(dev);
Kay Sievers7eff2e72007-08-14 15:15:12 +0200545 int len;
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800546
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +0200547 if (list_empty(&acpi_dev->pnp.ids))
548 return 0;
549
Kay Sievers7eff2e72007-08-14 15:15:12 +0200550 if (add_uevent_var(env, "MODALIAS="))
551 return -ENOMEM;
552 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
553 sizeof(env->buf) - env->buflen);
554 if (len >= (sizeof(env->buf) - env->buflen))
555 return -ENOMEM;
556 env->buflen += len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 return 0;
558}
559
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000560static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
561{
562 struct acpi_device *device = data;
563
564 device->driver->ops.notify(device, event);
565}
566
567static acpi_status acpi_device_notify_fixed(void *data)
568{
569 struct acpi_device *device = data;
570
Bjorn Helgaas53de5352009-08-31 22:32:20 +0000571 /* Fixed hardware devices have no handles */
572 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000573 return AE_OK;
574}
575
576static int acpi_device_install_notify_handler(struct acpi_device *device)
577{
578 acpi_status status;
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000579
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000580 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000581 status =
582 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
583 acpi_device_notify_fixed,
584 device);
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000585 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000586 status =
587 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
588 acpi_device_notify_fixed,
589 device);
590 else
591 status = acpi_install_notify_handler(device->handle,
592 ACPI_DEVICE_NOTIFY,
593 acpi_device_notify,
594 device);
595
596 if (ACPI_FAILURE(status))
597 return -EINVAL;
598 return 0;
599}
600
601static void acpi_device_remove_notify_handler(struct acpi_device *device)
602{
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000603 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000604 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
605 acpi_device_notify_fixed);
Bjorn Helgaasccba2a32009-09-21 19:29:15 +0000606 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000607 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
608 acpi_device_notify_fixed);
609 else
610 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
611 acpi_device_notify);
612}
613
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800614static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800615static int acpi_device_probe(struct device * dev)
Zhang Rui9e89dde2006-12-07 20:56:16 +0800616{
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800617 struct acpi_device *acpi_dev = to_acpi_device(dev);
618 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
619 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800621 ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
622 if (!ret) {
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000623 if (acpi_drv->ops.notify) {
624 ret = acpi_device_install_notify_handler(acpi_dev);
625 if (ret) {
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000626 if (acpi_drv->ops.remove)
Rafael J. Wysocki51fac832013-01-24 00:24:48 +0100627 acpi_drv->ops.remove(acpi_dev);
Toshi Kani5f27ee82013-02-07 21:19:13 +0000628 acpi_dev->driver = NULL;
629 acpi_dev->driver_data = NULL;
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000630 return ret;
631 }
632 }
633
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800634 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
635 "Found driver [%s] for device [%s]\n",
636 acpi_drv->name, acpi_dev->pnp.bus_id));
637 get_device(dev);
Zhang Rui9e89dde2006-12-07 20:56:16 +0800638 }
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800639 return ret;
640}
641
642static int acpi_device_remove(struct device * dev)
643{
644 struct acpi_device *acpi_dev = to_acpi_device(dev);
645 struct acpi_driver *acpi_drv = acpi_dev->driver;
646
647 if (acpi_drv) {
Bjorn Helgaas46ec8592009-03-30 17:48:13 +0000648 if (acpi_drv->ops.notify)
649 acpi_device_remove_notify_handler(acpi_dev);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800650 if (acpi_drv->ops.remove)
Rafael J. Wysocki51fac832013-01-24 00:24:48 +0100651 acpi_drv->ops.remove(acpi_dev);
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800652 }
653 acpi_dev->driver = NULL;
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700654 acpi_dev->driver_data = NULL;
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800655
656 put_device(dev);
Zhang Rui9e89dde2006-12-07 20:56:16 +0800657 return 0;
658}
659
David Brownell55955aa2007-05-08 00:28:35 -0700660struct bus_type acpi_bus_type = {
Zhang Rui9e89dde2006-12-07 20:56:16 +0800661 .name = "acpi",
Patrick Mochel5d9464a2006-12-07 20:56:27 +0800662 .match = acpi_bus_match,
663 .probe = acpi_device_probe,
664 .remove = acpi_device_remove,
665 .uevent = acpi_device_uevent,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666};
667
Rafael J. Wysockicf860be2013-01-24 12:49:49 +0100668int acpi_device_add(struct acpi_device *device,
669 void (*release)(struct device *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670{
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800671 int result;
672 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
673 int found = 0;
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +0000674
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100675 if (device->handle) {
676 acpi_status status;
677
678 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
679 device);
680 if (ACPI_FAILURE(status)) {
681 acpi_handle_err(device->handle,
682 "Unable to attach device data\n");
683 return -ENODEV;
684 }
685 }
686
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 /*
688 * Linkage
689 * -------
690 * Link this device to its parent and siblings.
691 */
692 INIT_LIST_HEAD(&device->children);
693 INIT_LIST_HEAD(&device->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 INIT_LIST_HEAD(&device->wakeup_list);
Lan Tianyu1033f902012-08-17 14:44:09 +0800695 INIT_LIST_HEAD(&device->physical_node_list);
696 mutex_init(&device->physical_node_lock);
Rafael J. Wysockibc9b6402013-01-17 14:11:05 +0100697 INIT_LIST_HEAD(&device->power_dependent);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800699 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
700 if (!new_bus_id) {
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100701 pr_err(PREFIX "Memory allocation error\n");
702 result = -ENOMEM;
703 goto err_detach;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800704 }
705
Shaohua Li90905892009-04-07 10:24:29 +0800706 mutex_lock(&acpi_device_lock);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800707 /*
708 * Find suitable bus_id and instance number in acpi_bus_id_list
709 * If failed, create one and link it into acpi_bus_id_list
710 */
711 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
Bjorn Helgaas1131b932009-09-21 13:35:29 -0600712 if (!strcmp(acpi_device_bus_id->bus_id,
713 acpi_device_hid(device))) {
714 acpi_device_bus_id->instance_no++;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800715 found = 1;
716 kfree(new_bus_id);
717 break;
718 }
719 }
Alex Chiang0c526d92009-05-14 08:31:37 -0600720 if (!found) {
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800721 acpi_device_bus_id = new_bus_id;
Bjorn Helgaas1131b932009-09-21 13:35:29 -0600722 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800723 acpi_device_bus_id->instance_no = 0;
724 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
725 }
Kay Sievers07944692008-10-30 01:18:59 +0100726 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 +0800727
Len Brown33b57152008-12-15 22:09:26 -0500728 if (device->parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 list_add_tail(&device->node, &device->parent->children);
Len Brown33b57152008-12-15 22:09:26 -0500730
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 if (device->wakeup.flags.valid)
732 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
Shaohua Li90905892009-04-07 10:24:29 +0800733 mutex_unlock(&acpi_device_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
Patrick Mochel1890a972006-12-07 20:56:31 +0800735 if (device->parent)
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +0000736 device->dev.parent = &device->parent->dev;
Patrick Mochel1890a972006-12-07 20:56:31 +0800737 device->dev.bus = &acpi_bus_type;
Rafael J. Wysocki82c7d5e2013-01-17 14:11:05 +0100738 device->dev.release = release;
Rafael J. Wysockicf860be2013-01-24 12:49:49 +0100739 result = device_add(&device->dev);
Alex Chiang0c526d92009-05-14 08:31:37 -0600740 if (result) {
Alex Chiang8b12b922009-05-14 08:31:32 -0600741 dev_err(&device->dev, "Error registering device\n");
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100742 goto err;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800743 }
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800744
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800745 result = acpi_device_setup_files(device);
Alex Chiang0c526d92009-05-14 08:31:37 -0600746 if (result)
Kay Sievers07944692008-10-30 01:18:59 +0100747 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
748 dev_name(&device->dev));
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800749
Li Shaohua96333572006-12-07 20:56:46 +0800750 device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800751 return 0;
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100752
753 err:
Shaohua Li90905892009-04-07 10:24:29 +0800754 mutex_lock(&acpi_device_lock);
Len Brown33b57152008-12-15 22:09:26 -0500755 if (device->parent)
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800756 list_del(&device->node);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800757 list_del(&device->wakeup_list);
Shaohua Li90905892009-04-07 10:24:29 +0800758 mutex_unlock(&acpi_device_lock);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +0100759
760 err_detach:
761 acpi_detach_data(device->handle, acpi_bus_data_handler);
Zhang Ruie49bd2dd2006-12-08 17:23:43 +0800762 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763}
764
Rafael J. Wysockib17b5372013-01-15 13:23:44 +0100765static void acpi_device_unregister(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766{
Shaohua Li90905892009-04-07 10:24:29 +0800767 mutex_lock(&acpi_device_lock);
Len Brown33b57152008-12-15 22:09:26 -0500768 if (device->parent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 list_del(&device->node);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770
771 list_del(&device->wakeup_list);
Shaohua Li90905892009-04-07 10:24:29 +0800772 mutex_unlock(&acpi_device_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773
774 acpi_detach_data(device->handle, acpi_bus_data_handler);
Patrick Mochel1890a972006-12-07 20:56:31 +0800775
Rafael J. Wysockibc9b6402013-01-17 14:11:05 +0100776 acpi_power_add_remove_device(device, false);
Patrick Mochelf883d9d2006-12-07 20:56:38 +0800777 acpi_device_remove_files(device);
Rafael J. Wysockib1c0f992013-01-24 12:50:09 +0100778 if (device->remove)
779 device->remove(device);
780
Rafael J. Wysockicf860be2013-01-24 12:49:49 +0100781 device_del(&device->dev);
Rafael J. Wysockibc9b6402013-01-17 14:11:05 +0100782 /*
783 * Drop the reference counts of all power resources the device depends
784 * on and turn off the ones that have no more references.
785 */
786 acpi_power_transition(device, ACPI_STATE_D3_COLD);
Rafael J. Wysockicf860be2013-01-24 12:49:49 +0100787 put_device(&device->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788}
789
Zhang Rui9e89dde2006-12-07 20:56:16 +0800790/* --------------------------------------------------------------------------
791 Driver Management
792 -------------------------------------------------------------------------- */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793/**
Randy Dunlapd758a8f2006-01-06 01:31:00 -0500794 * acpi_bus_driver_init - add a device to a driver
795 * @device: the device to add and initialize
796 * @driver: driver for the device
797 *
Alex Chiang0c526d92009-05-14 08:31:37 -0600798 * Used to initialize a device via its device driver. Called whenever a
Patrick Mochel1890a972006-12-07 20:56:31 +0800799 * driver is bound to a device. Invokes the driver's add() ops.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 */
801static int
Len Brown4be44fc2005-08-05 00:44:28 -0400802acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803{
Len Brown4be44fc2005-08-05 00:44:28 -0400804 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 if (!device || !driver)
Patrick Mocheld550d982006-06-27 00:41:40 -0400807 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808
809 if (!driver->ops.add)
Patrick Mocheld550d982006-06-27 00:41:40 -0400810 return -ENOSYS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811
812 result = driver->ops.add(device);
813 if (result) {
814 device->driver = NULL;
Pavel Machekdb89b4f2008-09-22 14:37:34 -0700815 device->driver_data = NULL;
Patrick Mocheld550d982006-06-27 00:41:40 -0400816 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 }
818
819 device->driver = driver;
820
821 /*
822 * TBD - Configuration Management: Assign resources to device based
823 * upon possible configuration and currently allocated resources.
824 */
825
Len Brown4be44fc2005-08-05 00:44:28 -0400826 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
827 "Driver successfully bound to device\n"));
Patrick Mocheld550d982006-06-27 00:41:40 -0400828 return 0;
Rajesh Shah3fb02732005-04-28 00:25:52 -0700829}
830
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831/**
Randy Dunlapd758a8f2006-01-06 01:31:00 -0500832 * acpi_bus_register_driver - register a driver with the ACPI bus
833 * @driver: driver being registered
834 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 * Registers a driver with the ACPI bus. Searches the namespace for all
Bjorn Helgaas9d9f7492006-03-28 17:04:00 -0500836 * devices that match the driver's criteria and binds. Returns zero for
837 * success or a negative error status for failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 */
Len Brown4be44fc2005-08-05 00:44:28 -0400839int acpi_bus_register_driver(struct acpi_driver *driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840{
Patrick Mochel1890a972006-12-07 20:56:31 +0800841 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
843 if (acpi_disabled)
Patrick Mocheld550d982006-06-27 00:41:40 -0400844 return -ENODEV;
Patrick Mochel1890a972006-12-07 20:56:31 +0800845 driver->drv.name = driver->name;
846 driver->drv.bus = &acpi_bus_type;
847 driver->drv.owner = driver->owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848
Patrick Mochel1890a972006-12-07 20:56:31 +0800849 ret = driver_register(&driver->drv);
850 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
Len Brown4be44fc2005-08-05 00:44:28 -0400853EXPORT_SYMBOL(acpi_bus_register_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854
855/**
Randy Dunlapd758a8f2006-01-06 01:31:00 -0500856 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
857 * @driver: driver to unregister
858 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 * Unregisters a driver with the ACPI bus. Searches the namespace for all
860 * devices that match the driver's criteria and unbinds.
861 */
Bjorn Helgaas06ea8e082006-04-27 05:25:00 -0400862void acpi_bus_unregister_driver(struct acpi_driver *driver)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863{
Patrick Mochel1890a972006-12-07 20:56:31 +0800864 driver_unregister(&driver->drv);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865}
Len Brown4be44fc2005-08-05 00:44:28 -0400866
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867EXPORT_SYMBOL(acpi_bus_unregister_driver);
868
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869/* --------------------------------------------------------------------------
870 Device Enumeration
871 -------------------------------------------------------------------------- */
Bjorn Helgaas5c478f42009-09-21 19:29:35 +0000872static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
873{
Rafael J. Wysocki456de892013-01-31 20:57:40 +0100874 struct acpi_device *device = NULL;
Bjorn Helgaas5c478f42009-09-21 19:29:35 +0000875 acpi_status status;
Bjorn Helgaas5c478f42009-09-21 19:29:35 +0000876
877 /*
878 * Fixed hardware devices do not appear in the namespace and do not
879 * have handles, but we fabricate acpi_devices for them, so we have
880 * to deal with them specially.
881 */
Rafael J. Wysocki456de892013-01-31 20:57:40 +0100882 if (!handle)
Bjorn Helgaas5c478f42009-09-21 19:29:35 +0000883 return acpi_root;
884
885 do {
886 status = acpi_get_parent(handle, &handle);
Bjorn Helgaas5c478f42009-09-21 19:29:35 +0000887 if (ACPI_FAILURE(status))
Rafael J. Wysocki456de892013-01-31 20:57:40 +0100888 return status == AE_NULL_ENTRY ? NULL : acpi_root;
889 } while (acpi_bus_get_device(handle, &device));
890 return device;
Bjorn Helgaas5c478f42009-09-21 19:29:35 +0000891}
892
Len Brownc8f7a622006-07-09 17:22:28 -0400893acpi_status
894acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
895{
896 acpi_status status;
897 acpi_handle tmp;
898 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
899 union acpi_object *obj;
900
901 status = acpi_get_handle(handle, "_EJD", &tmp);
902 if (ACPI_FAILURE(status))
903 return status;
904
905 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
906 if (ACPI_SUCCESS(status)) {
907 obj = buffer.pointer;
Holger Macht3b5fee52008-02-14 13:40:34 +0100908 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
909 ejd);
Len Brownc8f7a622006-07-09 17:22:28 -0400910 kfree(buffer.pointer);
911 }
912 return status;
913}
914EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
915
Bob Moore8e4319c2009-06-29 13:43:27 +0800916void acpi_bus_data_handler(acpi_handle handle, void *context)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917{
918
919 /* TBD */
920
921 return;
922}
923
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100924static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
925 struct acpi_device_wakeup *wakeup)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926{
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100927 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
928 union acpi_object *package = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 union acpi_object *element = NULL;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100930 acpi_status status;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100931 int err = -ENODATA;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100933 if (!wakeup)
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100934 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935
Rafael J. Wysocki993cbe52013-01-17 14:11:06 +0100936 INIT_LIST_HEAD(&wakeup->resources);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100938 /* _PRW */
939 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
940 if (ACPI_FAILURE(status)) {
941 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100942 return err;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100943 }
944
945 package = (union acpi_object *)buffer.pointer;
946
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100947 if (!package || package->package.count < 2)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100948 goto out;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100949
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 element = &(package->package.elements[0]);
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100951 if (!element)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100952 goto out;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100953
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 if (element->type == ACPI_TYPE_PACKAGE) {
955 if ((element->package.count < 2) ||
956 (element->package.elements[0].type !=
957 ACPI_TYPE_LOCAL_REFERENCE)
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100958 || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100959 goto out;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100960
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100961 wakeup->gpe_device =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 element->package.elements[0].reference.handle;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100963 wakeup->gpe_number =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 (u32) element->package.elements[1].integer.value;
965 } else if (element->type == ACPI_TYPE_INTEGER) {
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100966 wakeup->gpe_device = NULL;
967 wakeup->gpe_number = element->integer.value;
968 } else {
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100969 goto out;
970 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971
972 element = &(package->package.elements[1]);
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100973 if (element->type != ACPI_TYPE_INTEGER)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100974 goto out;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100975
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100976 wakeup->sleep_state = element->integer.value;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100978 err = acpi_extract_power_resources(package, 2, &wakeup->resources);
979 if (err)
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100980 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981
Rafael J. Wysocki0596a522013-01-17 14:11:07 +0100982 if (!list_empty(&wakeup->resources)) {
983 int sleep_state;
984
985 sleep_state = acpi_power_min_system_level(&wakeup->resources);
986 if (sleep_state < wakeup->sleep_state) {
987 acpi_handle_warn(handle, "Overriding _PRW sleep state "
988 "(S%d) by S%d from power resources\n",
989 (int)wakeup->sleep_state, sleep_state);
990 wakeup->sleep_state = sleep_state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 }
Lin Mingbba63a22010-12-13 13:39:17 +0800993 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
Rafael J. Wysocki98746472010-07-08 00:43:36 +0200994
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +0100995 out:
996 kfree(buffer.pointer);
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +0100997 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998}
999
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001000static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001{
Thomas Renninger29b71a12007-07-23 14:43:51 +02001002 struct acpi_device_id button_device_ids[] = {
Thomas Renninger29b71a12007-07-23 14:43:51 +02001003 {"PNP0C0C", 0},
Zhang Ruib7e38302012-12-04 23:23:16 +01001004 {"PNP0C0D", 0},
Thomas Renninger29b71a12007-07-23 14:43:51 +02001005 {"PNP0C0E", 0},
1006 {"", 0},
1007 };
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001008 acpi_status status;
1009 acpi_event_status event_status;
1010
Rafael J. Wysockib67ea762010-02-17 23:44:09 +01001011 device->wakeup.flags.notifier_present = 0;
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001012
1013 /* Power button, Lid switch always enable wakeup */
1014 if (!acpi_match_device_ids(device, button_device_ids)) {
1015 device->wakeup.flags.run_wake = 1;
Zhang Ruib7e38302012-12-04 23:23:16 +01001016 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1017 /* Do not use Lid/sleep button for S5 wakeup */
1018 if (device->wakeup.sleep_state == ACPI_STATE_S5)
1019 device->wakeup.sleep_state = ACPI_STATE_S4;
1020 }
Rafael J. Wysockif2b56bc2011-01-06 23:34:22 +01001021 device_set_wakeup_capable(&device->dev, true);
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001022 return;
1023 }
1024
Rafael J. Wysockie8e18c92010-07-08 00:42:51 +02001025 status = acpi_get_gpe_status(device->wakeup.gpe_device,
1026 device->wakeup.gpe_number,
1027 &event_status);
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001028 if (status == AE_OK)
1029 device->wakeup.flags.run_wake =
1030 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1031}
1032
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001033static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001034{
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001035 acpi_handle temp;
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001036 acpi_status status = 0;
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001037 int err;
Thomas Renninger29b71a12007-07-23 14:43:51 +02001038
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001039 /* Presence of _PRW indicates wake capable */
1040 status = acpi_get_handle(device->handle, "_PRW", &temp);
1041 if (ACPI_FAILURE(status))
1042 return;
1043
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001044 err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1045 &device->wakeup);
1046 if (err) {
1047 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001048 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 }
1050
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 device->wakeup.flags.valid = 1;
Rafael J. Wysocki9b83ccd2009-09-08 23:15:31 +02001052 device->wakeup.prepare_count = 0;
Rafael J. Wysockif5177092010-02-17 23:41:49 +01001053 acpi_bus_set_run_wake_flags(device);
Zhao Yakui729b2bd2008-03-19 13:26:54 +08001054 /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1055 * system for the ACPI device with the _PRW object.
1056 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1057 * So it is necessary to call _DSW object first. Only when it is not
1058 * present will the _PSW object used.
1059 */
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001060 err = acpi_device_sleep_wake(device, 0, 0, 0);
1061 if (err)
Rafael J. Wysocki77e76602008-07-07 03:33:34 +02001062 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1063 "error in _DSW or _PSW evaluation\n"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064}
1065
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001066static void acpi_bus_init_power_state(struct acpi_device *device, int state)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067{
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001068 struct acpi_device_power_state *ps = &device->power.states[state];
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001069 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1070 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001071 acpi_handle handle;
1072 acpi_status status;
Zhang Rui9e89dde2006-12-07 20:56:16 +08001073
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001074 INIT_LIST_HEAD(&ps->resources);
1075
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001076 /* Evaluate "_PRx" to get referenced power resources */
1077 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1078 if (ACPI_SUCCESS(status)) {
1079 union acpi_object *package = buffer.pointer;
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001080
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001081 if (buffer.length && package
1082 && package->type == ACPI_TYPE_PACKAGE
1083 && package->package.count) {
Rafael J. Wysockie88c9c62013-01-17 14:11:07 +01001084 int err = acpi_extract_power_resources(package, 0,
1085 &ps->resources);
1086 if (!err)
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001087 device->power.flags.power_resources = 1;
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001088 }
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001089 ACPI_FREE(buffer.pointer);
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001090 }
1091
1092 /* Evaluate "_PSx" to see if we can do explicit sets */
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001093 pathname[2] = 'S';
1094 status = acpi_get_handle(device->handle, pathname, &handle);
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001095 if (ACPI_SUCCESS(status))
1096 ps->flags.explicit_set = 1;
1097
1098 /*
1099 * State is valid if there are means to put the device into it.
1100 * D3hot is only valid if _PR3 present.
1101 */
Rafael J. Wysockief85bdb2013-01-17 14:11:07 +01001102 if (!list_empty(&ps->resources)
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001103 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1104 ps->flags.valid = 1;
1105 ps->flags.os_accessible = 1;
1106 }
1107
1108 ps->power = -1; /* Unknown - driver assigned */
1109 ps->latency = -1; /* Unknown - driver assigned */
1110}
1111
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001112static void acpi_bus_get_power_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113{
Rafael J. Wysocki8bc50532013-01-17 14:11:07 +01001114 acpi_status status;
1115 acpi_handle handle;
1116 u32 i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001118 /* Presence of _PS0|_PR0 indicates 'power manageable' */
1119 status = acpi_get_handle(device->handle, "_PS0", &handle);
1120 if (ACPI_FAILURE(status)) {
1121 status = acpi_get_handle(device->handle, "_PR0", &handle);
1122 if (ACPI_FAILURE(status))
1123 return;
1124 }
1125
1126 device->flags.power_manageable = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127
1128 /*
Zhang Rui9e89dde2006-12-07 20:56:16 +08001129 * Power Management Flags
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130 */
Zhang Rui9e89dde2006-12-07 20:56:16 +08001131 status = acpi_get_handle(device->handle, "_PSC", &handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 if (ACPI_SUCCESS(status))
Zhang Rui9e89dde2006-12-07 20:56:16 +08001133 device->power.flags.explicit_get = 1;
1134 status = acpi_get_handle(device->handle, "_IRC", &handle);
1135 if (ACPI_SUCCESS(status))
1136 device->power.flags.inrush_current = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137
1138 /*
Zhang Rui9e89dde2006-12-07 20:56:16 +08001139 * Enumerate supported power management states
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 */
Rafael J. Wysockif33ce562013-01-17 14:11:06 +01001141 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1142 acpi_bus_init_power_state(device, i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143
Rafael J. Wysocki0b224522013-01-17 14:11:06 +01001144 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145
Zhang Rui9e89dde2006-12-07 20:56:16 +08001146 /* Set defaults for D0 and D3 states (always valid) */
1147 device->power.states[ACPI_STATE_D0].flags.valid = 1;
1148 device->power.states[ACPI_STATE_D0].power = 100;
1149 device->power.states[ACPI_STATE_D3].flags.valid = 1;
1150 device->power.states[ACPI_STATE_D3].power = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151
Rafael J. Wysocki5c7dd712012-05-18 00:39:35 +02001152 /* Set D3cold's explicit_set flag if _PS3 exists. */
1153 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1154 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1155
Aaron Lu1399dfc2012-11-21 23:33:40 +01001156 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1157 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1158 device->power.flags.power_resources)
1159 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1160
Rafael J. Wysockiade3e7f2010-11-25 00:08:36 +01001161 acpi_bus_init_power(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162}
1163
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001164static void acpi_bus_get_flags(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165{
Len Brown4be44fc2005-08-05 00:44:28 -04001166 acpi_status status = AE_OK;
1167 acpi_handle temp = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 /* Presence of _STA indicates 'dynamic_status' */
1170 status = acpi_get_handle(device->handle, "_STA", &temp);
1171 if (ACPI_SUCCESS(status))
1172 device->flags.dynamic_status = 1;
1173
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 /* Presence of _RMV indicates 'removable' */
1175 status = acpi_get_handle(device->handle, "_RMV", &temp);
1176 if (ACPI_SUCCESS(status))
1177 device->flags.removable = 1;
1178
1179 /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1180 status = acpi_get_handle(device->handle, "_EJD", &temp);
1181 if (ACPI_SUCCESS(status))
1182 device->flags.ejectable = 1;
1183 else {
1184 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1185 if (ACPI_SUCCESS(status))
1186 device->flags.ejectable = 1;
1187 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188}
1189
Bjorn Helgaasc7bcb4e2009-09-21 19:29:25 +00001190static void acpi_device_get_busid(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191{
Len Brown4be44fc2005-08-05 00:44:28 -04001192 char bus_id[5] = { '?', 0 };
1193 struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1194 int i = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195
1196 /*
1197 * Bus ID
1198 * ------
1199 * The device's Bus ID is simply the object name.
1200 * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1201 */
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001202 if (ACPI_IS_ROOT_DEVICE(device)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 strcpy(device->pnp.bus_id, "ACPI");
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001204 return;
1205 }
1206
1207 switch (device->device_type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208 case ACPI_BUS_TYPE_POWER_BUTTON:
1209 strcpy(device->pnp.bus_id, "PWRF");
1210 break;
1211 case ACPI_BUS_TYPE_SLEEP_BUTTON:
1212 strcpy(device->pnp.bus_id, "SLPF");
1213 break;
1214 default:
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +00001215 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 /* Clean up trailing underscores (if any) */
1217 for (i = 3; i > 1; i--) {
1218 if (bus_id[i] == '_')
1219 bus_id[i] = '\0';
1220 else
1221 break;
1222 }
1223 strcpy(device->pnp.bus_id, bus_id);
1224 break;
1225 }
1226}
1227
Zhang Rui54735262007-01-11 02:09:09 -05001228/*
1229 * acpi_bay_match - see if a device is an ejectable driver bay
1230 *
1231 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1232 * then we can safely call it an ejectable drive bay
1233 */
1234static int acpi_bay_match(struct acpi_device *device){
1235 acpi_status status;
1236 acpi_handle handle;
1237 acpi_handle tmp;
1238 acpi_handle phandle;
1239
1240 handle = device->handle;
1241
1242 status = acpi_get_handle(handle, "_EJ0", &tmp);
1243 if (ACPI_FAILURE(status))
1244 return -ENODEV;
1245
1246 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1247 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1248 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1249 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1250 return 0;
1251
1252 if (acpi_get_parent(handle, &phandle))
1253 return -ENODEV;
1254
1255 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1256 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1257 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1258 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1259 return 0;
1260
1261 return -ENODEV;
1262}
1263
Frank Seidel3620f2f2007-12-07 13:20:34 +01001264/*
1265 * acpi_dock_match - see if a device has a _DCK method
1266 */
1267static int acpi_dock_match(struct acpi_device *device)
1268{
1269 acpi_handle tmp;
1270 return acpi_get_handle(device->handle, "_DCK", &tmp);
1271}
1272
Thomas Renninger620e1122010-10-01 10:54:00 +02001273const char *acpi_device_hid(struct acpi_device *device)
Bob Moore15b8dd52009-06-29 13:39:29 +08001274{
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001275 struct acpi_hardware_id *hid;
Bob Moore15b8dd52009-06-29 13:39:29 +08001276
Thomas Renninger2b2ae7c2010-10-01 10:53:59 +02001277 if (list_empty(&device->pnp.ids))
1278 return dummy_hid;
1279
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001280 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1281 return hid->id;
1282}
1283EXPORT_SYMBOL(acpi_device_hid);
Bob Moore15b8dd52009-06-29 13:39:29 +08001284
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001285static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1286{
1287 struct acpi_hardware_id *id;
Bob Moore15b8dd52009-06-29 13:39:29 +08001288
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001289 id = kmalloc(sizeof(*id), GFP_KERNEL);
1290 if (!id)
1291 return;
Bob Moore15b8dd52009-06-29 13:39:29 +08001292
Thomas Meyer581de592011-08-06 11:32:56 +02001293 id->id = kstrdup(dev_id, GFP_KERNEL);
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001294 if (!id->id) {
1295 kfree(id);
1296 return;
Bob Moore15b8dd52009-06-29 13:39:29 +08001297 }
1298
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001299 list_add_tail(&id->list, &device->pnp.ids);
Bob Moore15b8dd52009-06-29 13:39:29 +08001300}
1301
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001302/*
1303 * Old IBM workstations have a DSDT bug wherein the SMBus object
1304 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1305 * prefix. Work around this.
1306 */
1307static int acpi_ibm_smbus_match(struct acpi_device *device)
1308{
1309 acpi_handle h_dummy;
1310 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1311 int result;
1312
1313 if (!dmi_name_in_vendors("IBM"))
1314 return -ENODEV;
1315
1316 /* Look for SMBS object */
1317 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1318 if (result)
1319 return result;
1320
1321 if (strcmp("SMBS", path.pointer)) {
1322 result = -ENODEV;
1323 goto out;
1324 }
1325
1326 /* Does it have the necessary (but misnamed) methods? */
1327 result = -ENODEV;
1328 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1329 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1330 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1331 result = 0;
1332out:
1333 kfree(path.pointer);
1334 return result;
1335}
1336
Bjorn Helgaasc7bcb4e2009-09-21 19:29:25 +00001337static void acpi_device_set_id(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338{
Len Brown4be44fc2005-08-05 00:44:28 -04001339 acpi_status status;
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001340 struct acpi_device_info *info;
Lv Zheng78e25fe2012-10-31 02:25:24 +00001341 struct acpi_pnp_device_id_list *cid_list;
Bjorn Helgaas7f47fa62009-09-21 13:35:19 -06001342 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343
Bjorn Helgaasc7bcb4e2009-09-21 19:29:25 +00001344 switch (device->device_type) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 case ACPI_BUS_TYPE_DEVICE:
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001346 if (ACPI_IS_ROOT_DEVICE(device)) {
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001347 acpi_add_id(device, ACPI_SYSTEM_HID);
Bjorn Helgaas859ac9a42009-09-21 19:29:50 +00001348 break;
1349 }
1350
Bjorn Helgaas66b7ed42009-09-21 19:29:05 +00001351 status = acpi_get_object_info(device->handle, &info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 if (ACPI_FAILURE(status)) {
Harvey Harrison96b2dd12008-03-05 18:24:51 -08001353 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354 return;
1355 }
1356
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 if (info->valid & ACPI_VALID_HID)
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001358 acpi_add_id(device, info->hardware_id.string);
1359 if (info->valid & ACPI_VALID_CID) {
Bob Moore15b8dd52009-06-29 13:39:29 +08001360 cid_list = &info->compatible_id_list;
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001361 for (i = 0; i < cid_list->count; i++)
1362 acpi_add_id(device, cid_list->ids[i].string);
1363 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 if (info->valid & ACPI_VALID_ADR) {
1365 device->pnp.bus_address = info->address;
1366 device->flags.bus_address = 1;
1367 }
Lv Zhengccf78042012-10-30 14:41:07 +01001368 if (info->valid & ACPI_VALID_UID)
1369 device->pnp.unique_id = kstrdup(info->unique_id.string,
1370 GFP_KERNEL);
Zhang Ruiae843332006-12-07 20:57:10 +08001371
Bjorn Helgaasa83893ae2009-10-02 11:03:12 -04001372 kfree(info);
1373
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001374 /*
1375 * Some devices don't reliably have _HIDs & _CIDs, so add
1376 * synthetic HIDs to make sure drivers can find them.
1377 */
Thomas Renningerc3d6de62008-08-01 17:37:55 +02001378 if (acpi_is_video_device(device))
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001379 acpi_add_id(device, ACPI_VIDEO_HID);
Frank Seidel3620f2f2007-12-07 13:20:34 +01001380 else if (ACPI_SUCCESS(acpi_bay_match(device)))
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001381 acpi_add_id(device, ACPI_BAY_HID);
Frank Seidel3620f2f2007-12-07 13:20:34 +01001382 else if (ACPI_SUCCESS(acpi_dock_match(device)))
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001383 acpi_add_id(device, ACPI_DOCK_HID);
Darrick J. Wong222e82a2010-03-24 14:38:37 +01001384 else if (!acpi_ibm_smbus_match(device))
1385 acpi_add_id(device, ACPI_SMBUS_IBM_HID);
Rafael J. Wysocki4f5f64c2013-01-04 23:00:54 +01001386 else if (list_empty(&device->pnp.ids) &&
Bjorn Helgaasb7b30de2010-03-24 10:44:33 -06001387 ACPI_IS_ROOT_DEVICE(device->parent)) {
1388 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1389 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1390 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1391 }
Zhang Rui54735262007-01-11 02:09:09 -05001392
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 break;
1394 case ACPI_BUS_TYPE_POWER:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001395 acpi_add_id(device, ACPI_POWER_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 break;
1397 case ACPI_BUS_TYPE_PROCESSOR:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001398 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 case ACPI_BUS_TYPE_THERMAL:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001401 acpi_add_id(device, ACPI_THERMAL_HID);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 break;
1403 case ACPI_BUS_TYPE_POWER_BUTTON:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001404 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 break;
1406 case ACPI_BUS_TYPE_SLEEP_BUTTON:
Bjorn Helgaas57f36742009-09-21 13:35:40 -06001407 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 break;
1409 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410}
1411
Rafael J. Wysocki82c7d5e2013-01-17 14:11:05 +01001412void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1413 int type, unsigned long long sta)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414{
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001415 INIT_LIST_HEAD(&device->pnp.ids);
1416 device->device_type = type;
1417 device->handle = handle;
1418 device->parent = acpi_bus_get_parent(handle);
1419 STRUCT_TO_INT(device->status) = sta;
1420 acpi_device_get_busid(device);
1421 acpi_device_set_id(device);
1422 acpi_bus_get_flags(device);
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001423 device->flags.match_driver = false;
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001424 device_initialize(&device->dev);
1425 dev_set_uevent_suppress(&device->dev, true);
1426}
Bjorn Helgaasbc3b0772009-09-21 19:29:20 +00001427
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001428void acpi_device_add_finalize(struct acpi_device *device)
1429{
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001430 device->flags.match_driver = true;
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001431 dev_set_uevent_suppress(&device->dev, false);
1432 kobject_uevent(&device->dev.kobj, KOBJ_ADD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433}
1434
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001435static int acpi_add_single_object(struct acpi_device **child,
1436 acpi_handle handle, int type,
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001437 unsigned long long sta)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438{
Bjorn Helgaas77c24882009-09-21 19:29:30 +00001439 int result;
1440 struct acpi_device *device;
Bjorn Helgaas29aaefa2009-09-21 19:28:54 +00001441 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442
Burman Yan36bcbec2006-12-19 12:56:11 -08001443 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 if (!device) {
Len Brown64684632006-06-26 23:41:38 -04001445 printk(KERN_ERR PREFIX "Memory allocation error\n");
Patrick Mocheld550d982006-06-27 00:41:40 -04001446 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001449 acpi_init_device_object(device, handle, type, sta);
1450 acpi_bus_get_power_flags(device);
Rafael J. Wysockid57d09a2011-01-06 23:41:27 +01001451 acpi_bus_get_wakeup_device_flags(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001453 result = acpi_device_add(device, acpi_device_release);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001454 if (result) {
Hugh Dickins718fb0d2009-08-06 23:18:12 +00001455 acpi_device_release(&device->dev);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001456 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 }
1458
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001459 acpi_power_add_remove_device(device, true);
Rafael J. Wysockicf860be2013-01-24 12:49:49 +01001460 acpi_device_add_finalize(device);
Rafael J. Wysockid43e1672013-01-17 14:11:05 +01001461 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1462 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1463 dev_name(&device->dev), (char *) buffer.pointer,
1464 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1465 kfree(buffer.pointer);
1466 *child = device;
1467 return 0;
Rafael J. Wysockibf325f92010-11-25 00:10:44 +01001468}
1469
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001470static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1471 unsigned long long *sta)
1472{
1473 acpi_status status;
1474 acpi_object_type acpi_type;
1475
1476 status = acpi_get_type(handle, &acpi_type);
1477 if (ACPI_FAILURE(status))
1478 return -ENODEV;
1479
1480 switch (acpi_type) {
1481 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
1482 case ACPI_TYPE_DEVICE:
1483 *type = ACPI_BUS_TYPE_DEVICE;
1484 status = acpi_bus_get_status_handle(handle, sta);
1485 if (ACPI_FAILURE(status))
1486 return -ENODEV;
1487 break;
1488 case ACPI_TYPE_PROCESSOR:
1489 *type = ACPI_BUS_TYPE_PROCESSOR;
1490 status = acpi_bus_get_status_handle(handle, sta);
1491 if (ACPI_FAILURE(status))
1492 return -ENODEV;
1493 break;
1494 case ACPI_TYPE_THERMAL:
1495 *type = ACPI_BUS_TYPE_THERMAL;
1496 *sta = ACPI_STA_DEFAULT;
1497 break;
1498 case ACPI_TYPE_POWER:
1499 *type = ACPI_BUS_TYPE_POWER;
1500 *sta = ACPI_STA_DEFAULT;
1501 break;
1502 default:
1503 return -ENODEV;
1504 }
1505
1506 return 0;
1507}
1508
Rafael J. Wysockie3863092012-12-21 00:36:47 +01001509static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1510 void *not_used, void **return_value)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511{
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001512 struct acpi_device *device = NULL;
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001513 int type;
1514 unsigned long long sta;
Bjorn Helgaase3b87f82009-09-21 19:30:11 +00001515 acpi_status status;
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001516 int result;
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001517
Rafael J. Wysocki4002bf32012-12-21 00:36:44 +01001518 acpi_bus_get_device(handle, &device);
1519 if (device)
1520 goto out;
1521
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001522 result = acpi_bus_type_and_status(handle, &type, &sta);
1523 if (result)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001524 return AE_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525
Rafael J. Wysocki82c7d5e2013-01-17 14:11:05 +01001526 if (type == ACPI_BUS_TYPE_POWER) {
1527 acpi_add_power_resource(handle);
1528 return AE_OK;
1529 }
1530
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001531 if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001532 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
Rafael J. Wysocki86e4e202011-01-06 23:40:00 +01001533 struct acpi_device_wakeup wakeup;
1534 acpi_handle temp;
1535
1536 status = acpi_get_handle(handle, "_PRW", &temp);
Rafael J. Wysocki993cbe52013-01-17 14:11:06 +01001537 if (ACPI_SUCCESS(status)) {
Rafael J. Wysocki86e4e202011-01-06 23:40:00 +01001538 acpi_bus_extract_wakeup_device_power_package(handle,
1539 &wakeup);
Rafael J. Wysocki993cbe52013-01-17 14:11:06 +01001540 acpi_power_resources_list_free(&wakeup.resources);
1541 }
Bjorn Helgaas778cbc12009-09-21 19:30:06 +00001542 return AE_CTRL_DEPTH;
Rafael J. Wysockib581a7f2010-12-17 22:34:01 +01001543 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001545 acpi_add_single_object(&device, handle, type, sta);
Bjorn Helgaase3b87f82009-09-21 19:30:11 +00001546 if (!device)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001547 return AE_CTRL_DEPTH;
1548
Rafael J. Wysocki4002bf32012-12-21 00:36:44 +01001549 out:
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001550 if (!*return_value)
1551 *return_value = device;
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001552
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001553 return AE_OK;
1554}
1555
Rafael J. Wysocki87b85b32013-02-06 13:05:22 +01001556static int acpi_scan_do_attach_handler(struct acpi_device *device, char *id)
Rafael J. Wysockica589f92013-01-30 14:27:29 +01001557{
1558 struct acpi_scan_handler *handler;
Rafael J. Wysockica589f92013-01-30 14:27:29 +01001559
1560 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) {
Rafael J. Wysocki87b85b32013-02-06 13:05:22 +01001561 const struct acpi_device_id *devid;
Rafael J. Wysockica589f92013-01-30 14:27:29 +01001562
Rafael J. Wysocki87b85b32013-02-06 13:05:22 +01001563 for (devid = handler->ids; devid->id[0]; devid++) {
1564 int ret;
Rafael J. Wysockica589f92013-01-30 14:27:29 +01001565
Rafael J. Wysocki87b85b32013-02-06 13:05:22 +01001566 if (strcmp((char *)devid->id, id))
1567 continue;
1568
1569 ret = handler->attach(device, devid);
1570 if (ret > 0) {
1571 device->handler = handler;
1572 return ret;
1573 } else if (ret < 0) {
1574 return ret;
1575 }
Rafael J. Wysockica589f92013-01-30 14:27:29 +01001576 }
1577 }
Rafael J. Wysocki87b85b32013-02-06 13:05:22 +01001578 return 0;
1579}
1580
1581static int acpi_scan_attach_handler(struct acpi_device *device)
1582{
1583 struct acpi_hardware_id *hwid;
1584 int ret = 0;
1585
1586 list_for_each_entry(hwid, &device->pnp.ids, list) {
1587 ret = acpi_scan_do_attach_handler(device, hwid->id);
1588 if (ret)
1589 break;
1590
1591 }
Rafael J. Wysockica589f92013-01-30 14:27:29 +01001592 return ret;
1593}
1594
Rafael J. Wysocki0fc300b2012-12-21 00:36:41 +01001595static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1596 void *not_used, void **ret_not_used)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001597{
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001598 struct acpi_device *device;
1599 unsigned long long sta_not_used;
Rafael J. Wysockica589f92013-01-30 14:27:29 +01001600 int ret;
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001601
1602 /*
1603 * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1604 * namespace walks prematurely.
1605 */
Rafael J. Wysockica589f92013-01-30 14:27:29 +01001606 if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001607 return AE_OK;
1608
1609 if (acpi_bus_get_device(handle, &device))
1610 return AE_CTRL_DEPTH;
1611
Rafael J. Wysockica589f92013-01-30 14:27:29 +01001612 ret = acpi_scan_attach_handler(device);
1613 if (ret)
1614 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1615
1616 ret = device_attach(&device->dev);
1617 return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001618}
1619
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01001620/**
1621 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1622 * @handle: Root of the namespace scope to scan.
1623 *
1624 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1625 * found devices.
1626 *
1627 * If no devices were found, -ENODEV is returned, but it does not mean that
1628 * there has been a real error. There just have been no suitable ACPI objects
1629 * in the table trunk from which the kernel could create a device and add an
1630 * appropriate driver.
1631 */
1632int acpi_bus_scan(acpi_handle handle)
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001633{
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001634 void *device = NULL;
Rafael J. Wysockic511cc12013-01-27 21:17:29 +01001635 int error = 0;
1636
1637 mutex_lock(&acpi_scan_lock);
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001638
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001639 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
Bjorn Helgaas51a85fa2009-09-21 19:29:56 +00001640 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
Rafael J. Wysockie3863092012-12-21 00:36:47 +01001641 acpi_bus_check_add, NULL, NULL, &device);
Rajesh Shah3fb02732005-04-28 00:25:52 -07001642
Thomas Renningerd2f66502010-01-29 17:48:51 +01001643 if (!device)
Rafael J. Wysockic511cc12013-01-27 21:17:29 +01001644 error = -ENODEV;
1645 else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
Rafael J. Wysocki805d410f2012-12-21 00:36:39 +01001646 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
Rafael J. Wysocki0fc300b2012-12-21 00:36:41 +01001647 acpi_bus_device_attach, NULL, NULL, NULL);
Rajesh Shah3fb02732005-04-28 00:25:52 -07001648
Rafael J. Wysockic511cc12013-01-27 21:17:29 +01001649 mutex_unlock(&acpi_scan_lock);
1650 return error;
Rajesh Shah3fb02732005-04-28 00:25:52 -07001651}
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01001652EXPORT_SYMBOL(acpi_bus_scan);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001654static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1655 void *not_used, void **ret_not_used)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656{
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001657 struct acpi_device *device = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001659 if (!acpi_bus_get_device(handle, &device)) {
Rafael J. Wysockica589f92013-01-30 14:27:29 +01001660 struct acpi_scan_handler *dev_handler = device->handler;
1661
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001662 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
Rafael J. Wysockica589f92013-01-30 14:27:29 +01001663 if (dev_handler) {
1664 if (dev_handler->detach)
1665 dev_handler->detach(device);
1666
1667 device->handler = NULL;
1668 } else {
1669 device_release_driver(&device->dev);
1670 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001671 }
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001672 return AE_OK;
1673}
1674
1675static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1676 void *not_used, void **ret_not_used)
1677{
1678 struct acpi_device *device = NULL;
1679
1680 if (!acpi_bus_get_device(handle, &device))
1681 acpi_device_unregister(device);
1682
1683 return AE_OK;
1684}
1685
Rafael J. Wysockibfee26d2013-01-26 00:27:44 +01001686void acpi_bus_trim(struct acpi_device *start)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687{
Rafael J. Wysockic511cc12013-01-27 21:17:29 +01001688 mutex_lock(&acpi_scan_lock);
1689
Rafael J. Wysockicecdb192013-01-15 13:24:02 +01001690 /*
Rafael J. Wysocki05404d82013-01-15 13:24:13 +01001691 * Execute acpi_bus_device_detach() as a post-order callback to detach
1692 * all ACPI drivers from the device nodes being removed.
1693 */
1694 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1695 acpi_bus_device_detach, NULL, NULL);
1696 acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1697 /*
Rafael J. Wysockicecdb192013-01-15 13:24:02 +01001698 * Execute acpi_bus_remove() as a post-order callback to remove device
1699 * nodes in the given namespace scope.
1700 */
1701 acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1702 acpi_bus_remove, NULL, NULL);
1703 acpi_bus_remove(start->handle, 0, NULL, NULL);
Rafael J. Wysockic511cc12013-01-27 21:17:29 +01001704
1705 mutex_unlock(&acpi_scan_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706}
Kristen Accardiceaba662006-02-23 17:56:01 -08001707EXPORT_SYMBOL_GPL(acpi_bus_trim);
1708
Bjorn Helgaase8b945c2009-09-21 19:28:59 +00001709static int acpi_bus_scan_fixed(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001710{
Len Brown4be44fc2005-08-05 00:44:28 -04001711 int result = 0;
Li Shaohuac4168bf2006-12-07 20:56:41 +08001712
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713 /*
1714 * Enumerate all fixed-feature devices.
1715 */
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001716 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1717 struct acpi_device *device = NULL;
1718
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001719 result = acpi_add_single_object(&device, NULL,
Li Shaohuac4168bf2006-12-07 20:56:41 +08001720 ACPI_BUS_TYPE_POWER_BUTTON,
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001721 ACPI_STA_DEFAULT);
1722 if (result)
1723 return result;
1724
1725 result = device_attach(&device->dev);
1726 if (result < 0)
1727 return result;
1728
Daniel Drakec10d7a12012-05-10 00:08:43 +01001729 device_init_wakeup(&device->dev, true);
Rajesh Shah3fb02732005-04-28 00:25:52 -07001730 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001732 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1733 struct acpi_device *device = NULL;
1734
Bjorn Helgaas5c478f42009-09-21 19:29:35 +00001735 result = acpi_add_single_object(&device, NULL,
Li Shaohuac4168bf2006-12-07 20:56:41 +08001736 ACPI_BUS_TYPE_SLEEP_BUTTON,
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001737 ACPI_STA_DEFAULT);
1738 if (result)
1739 return result;
1740
1741 result = device_attach(&device->dev);
Rajesh Shah3fb02732005-04-28 00:25:52 -07001742 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743
Rafael J. Wysocki2c0d4fe2013-01-29 13:57:20 +01001744 return result < 0 ? result : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745}
1746
Bjorn Helgaase747f272009-03-24 16:49:43 -06001747int __init acpi_scan_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748{
1749 int result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750
Patrick Mochel5b327262006-05-10 10:33:00 -04001751 result = bus_register(&acpi_bus_type);
1752 if (result) {
1753 /* We don't want to quit even if we failed to add suspend/resume */
1754 printk(KERN_ERR PREFIX "Could not register bus type\n");
1755 }
1756
Rafael J. Wysocki92ef2a22012-12-21 00:36:40 +01001757 acpi_pci_root_init();
Rafael J. Wysocki4daeaf62013-01-30 14:27:37 +01001758 acpi_pci_link_init();
Rafael J. Wysocki141a2972013-01-30 14:27:40 +01001759 acpi_platform_init();
Mika Westerberg13176bb2013-01-17 09:59:33 +00001760 acpi_csrt_init();
Rafael J. Wysocki737f1a92013-02-08 23:52:39 +01001761 acpi_container_init();
Rafael J. Wysocki97d9a9e2010-11-25 00:10:02 +01001762
Linus Torvalds1da177e2005-04-16 15:20:36 -07001763 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001764 * Enumerate devices in the ACPI namespace.
1765 */
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001766 result = acpi_bus_scan(ACPI_ROOT_OBJECT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001767 if (result)
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001768 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001769
Rafael J. Wysocki0cd6ac52012-12-21 00:36:49 +01001770 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001771 if (result)
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01001772 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001773
Rafael J. Wysockib8bd7592013-01-19 01:27:35 +01001774 result = acpi_bus_scan_fixed();
1775 if (result) {
1776 acpi_device_unregister(acpi_root);
1777 return result;
1778 }
1779
1780 acpi_update_all_gpes();
1781 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001782}