Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Link physical devices with ACPI devices support
4 *
5 * Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
6 * Copyright (c) 2005 Intel Corp.
7 */
8
9#include <linux/acpi_iort.h>
10#include <linux/export.h>
11#include <linux/init.h>
12#include <linux/list.h>
13#include <linux/device.h>
14#include <linux/slab.h>
15#include <linux/rwsem.h>
16#include <linux/acpi.h>
17#include <linux/dma-mapping.h>
18#include <linux/platform_device.h>
19
20#include "internal.h"
21
22#define ACPI_GLUE_DEBUG 0
23#if ACPI_GLUE_DEBUG
24#define DBG(fmt, ...) \
25 printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__)
26#else
27#define DBG(fmt, ...) \
28do { \
29 if (0) \
30 printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__); \
31} while (0)
32#endif
33static LIST_HEAD(bus_type_list);
34static DECLARE_RWSEM(bus_type_sem);
35
36#define PHYSICAL_NODE_STRING "physical_node"
37#define PHYSICAL_NODE_NAME_SIZE (sizeof(PHYSICAL_NODE_STRING) + 10)
38
39int register_acpi_bus_type(struct acpi_bus_type *type)
40{
41 if (acpi_disabled)
42 return -ENODEV;
43 if (type && type->match && type->find_companion) {
44 down_write(&bus_type_sem);
45 list_add_tail(&type->list, &bus_type_list);
46 up_write(&bus_type_sem);
47 printk(KERN_INFO PREFIX "bus type %s registered\n", type->name);
48 return 0;
49 }
50 return -ENODEV;
51}
52EXPORT_SYMBOL_GPL(register_acpi_bus_type);
53
54int unregister_acpi_bus_type(struct acpi_bus_type *type)
55{
56 if (acpi_disabled)
57 return 0;
58 if (type) {
59 down_write(&bus_type_sem);
60 list_del_init(&type->list);
61 up_write(&bus_type_sem);
62 printk(KERN_INFO PREFIX "bus type %s unregistered\n",
63 type->name);
64 return 0;
65 }
66 return -ENODEV;
67}
68EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
69
70static struct acpi_bus_type *acpi_get_bus_type(struct device *dev)
71{
72 struct acpi_bus_type *tmp, *ret = NULL;
73
74 down_read(&bus_type_sem);
75 list_for_each_entry(tmp, &bus_type_list, list) {
76 if (tmp->match(dev)) {
77 ret = tmp;
78 break;
79 }
80 }
81 up_read(&bus_type_sem);
82 return ret;
83}
84
85#define FIND_CHILD_MIN_SCORE 1
86#define FIND_CHILD_MAX_SCORE 2
87
88static int find_child_checks(struct acpi_device *adev, bool check_children)
89{
90 bool sta_present = true;
91 unsigned long long sta;
92 acpi_status status;
93
94 status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
95 if (status == AE_NOT_FOUND)
96 sta_present = false;
97 else if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED))
98 return -ENODEV;
99
100 if (check_children && list_empty(&adev->children))
101 return -ENODEV;
102
103 /*
104 * If the device has a _HID returning a valid ACPI/PNP device ID, it is
105 * better to make it look less attractive here, so that the other device
106 * with the same _ADR value (that may not have a valid device ID) can be
107 * matched going forward. [This means a second spec violation in a row,
108 * so whatever we do here is best effort anyway.]
109 */
110 return sta_present && !adev->pnp.type.platform_id ?
111 FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE;
112}
113
114struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
115 u64 address, bool check_children)
116{
117 struct acpi_device *adev, *ret = NULL;
118 int ret_score = 0;
119
120 if (!parent)
121 return NULL;
122
123 list_for_each_entry(adev, &parent->children, node) {
124 unsigned long long addr;
125 acpi_status status;
126 int score;
127
128 status = acpi_evaluate_integer(adev->handle, METHOD_NAME__ADR,
129 NULL, &addr);
130 if (ACPI_FAILURE(status) || addr != address)
131 continue;
132
133 if (!ret) {
134 /* This is the first matching object. Save it. */
135 ret = adev;
136 continue;
137 }
138 /*
139 * There is more than one matching device object with the same
140 * _ADR value. That really is unexpected, so we are kind of
141 * beyond the scope of the spec here. We have to choose which
142 * one to return, though.
143 *
144 * First, check if the previously found object is good enough
145 * and return it if so. Second, do the same for the object that
146 * we've just found.
147 */
148 if (!ret_score) {
149 ret_score = find_child_checks(ret, check_children);
150 if (ret_score == FIND_CHILD_MAX_SCORE)
151 return ret;
152 }
153 score = find_child_checks(adev, check_children);
154 if (score == FIND_CHILD_MAX_SCORE) {
155 return adev;
156 } else if (score > ret_score) {
157 ret = adev;
158 ret_score = score;
159 }
160 }
161 return ret;
162}
163EXPORT_SYMBOL_GPL(acpi_find_child_device);
164
165static void acpi_physnode_link_name(char *buf, unsigned int node_id)
166{
167 if (node_id > 0)
168 snprintf(buf, PHYSICAL_NODE_NAME_SIZE,
169 PHYSICAL_NODE_STRING "%u", node_id);
170 else
171 strcpy(buf, PHYSICAL_NODE_STRING);
172}
173
174int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
175{
176 struct acpi_device_physical_node *physical_node, *pn;
177 char physical_node_name[PHYSICAL_NODE_NAME_SIZE];
178 struct list_head *physnode_list;
179 unsigned int node_id;
180 int retval = -EINVAL;
181
182 if (has_acpi_companion(dev)) {
183 if (acpi_dev) {
184 dev_warn(dev, "ACPI companion already set\n");
185 return -EINVAL;
186 } else {
187 acpi_dev = ACPI_COMPANION(dev);
188 }
189 }
190 if (!acpi_dev)
191 return -EINVAL;
192
193 get_device(&acpi_dev->dev);
194 get_device(dev);
195 physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
196 if (!physical_node) {
197 retval = -ENOMEM;
198 goto err;
199 }
200
201 mutex_lock(&acpi_dev->physical_node_lock);
202
203 /*
204 * Keep the list sorted by node_id so that the IDs of removed nodes can
205 * be recycled easily.
206 */
207 physnode_list = &acpi_dev->physical_node_list;
208 node_id = 0;
209 list_for_each_entry(pn, &acpi_dev->physical_node_list, node) {
210 /* Sanity check. */
211 if (pn->dev == dev) {
212 mutex_unlock(&acpi_dev->physical_node_lock);
213
214 dev_warn(dev, "Already associated with ACPI node\n");
215 kfree(physical_node);
216 if (ACPI_COMPANION(dev) != acpi_dev)
217 goto err;
218
219 put_device(dev);
220 put_device(&acpi_dev->dev);
221 return 0;
222 }
223 if (pn->node_id == node_id) {
224 physnode_list = &pn->node;
225 node_id++;
226 }
227 }
228
229 physical_node->node_id = node_id;
230 physical_node->dev = dev;
231 list_add(&physical_node->node, physnode_list);
232 acpi_dev->physical_node_count++;
233
234 if (!has_acpi_companion(dev))
235 ACPI_COMPANION_SET(dev, acpi_dev);
236
237 acpi_physnode_link_name(physical_node_name, node_id);
238 retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
239 physical_node_name);
240 if (retval)
241 dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n",
242 physical_node_name, retval);
243
244 retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
245 "firmware_node");
246 if (retval)
247 dev_err(dev, "Failed to create link firmware_node (%d)\n",
248 retval);
249
250 mutex_unlock(&acpi_dev->physical_node_lock);
251
252 if (acpi_dev->wakeup.flags.valid)
253 device_set_wakeup_capable(dev, true);
254
255 return 0;
256
257 err:
258 ACPI_COMPANION_SET(dev, NULL);
259 put_device(dev);
260 put_device(&acpi_dev->dev);
261 return retval;
262}
263EXPORT_SYMBOL_GPL(acpi_bind_one);
264
265int acpi_unbind_one(struct device *dev)
266{
267 struct acpi_device *acpi_dev = ACPI_COMPANION(dev);
268 struct acpi_device_physical_node *entry;
269
270 if (!acpi_dev)
271 return 0;
272
273 mutex_lock(&acpi_dev->physical_node_lock);
274
275 list_for_each_entry(entry, &acpi_dev->physical_node_list, node)
276 if (entry->dev == dev) {
277 char physnode_name[PHYSICAL_NODE_NAME_SIZE];
278
279 list_del(&entry->node);
280 acpi_dev->physical_node_count--;
281
282 acpi_physnode_link_name(physnode_name, entry->node_id);
283 sysfs_remove_link(&acpi_dev->dev.kobj, physnode_name);
284 sysfs_remove_link(&dev->kobj, "firmware_node");
285 ACPI_COMPANION_SET(dev, NULL);
286 /* Drop references taken by acpi_bind_one(). */
287 put_device(dev);
288 put_device(&acpi_dev->dev);
289 kfree(entry);
290 break;
291 }
292
293 mutex_unlock(&acpi_dev->physical_node_lock);
294 return 0;
295}
296EXPORT_SYMBOL_GPL(acpi_unbind_one);
297
298static int acpi_device_notify(struct device *dev)
299{
300 struct acpi_bus_type *type = acpi_get_bus_type(dev);
301 struct acpi_device *adev;
302 int ret;
303
304 ret = acpi_bind_one(dev, NULL);
305 if (ret && type) {
306 struct acpi_device *adev;
307
308 adev = type->find_companion(dev);
309 if (!adev) {
310 DBG("Unable to get handle for %s\n", dev_name(dev));
311 ret = -ENODEV;
312 goto out;
313 }
314 ret = acpi_bind_one(dev, adev);
315 if (ret)
316 goto out;
317 }
318 adev = ACPI_COMPANION(dev);
319 if (!adev)
320 goto out;
321
322 if (dev_is_platform(dev))
323 acpi_configure_pmsi_domain(dev);
324
325 if (type && type->setup)
326 type->setup(dev);
327 else if (adev->handler && adev->handler->bind)
328 adev->handler->bind(dev);
329
330 out:
331#if ACPI_GLUE_DEBUG
332 if (!ret) {
333 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
334
335 acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
336 DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
337 kfree(buffer.pointer);
338 } else
339 DBG("Device %s -> No ACPI support\n", dev_name(dev));
340#endif
341
342 return ret;
343}
344
345static int acpi_device_notify_remove(struct device *dev)
346{
347 struct acpi_device *adev = ACPI_COMPANION(dev);
348 struct acpi_bus_type *type;
349
350 if (!adev)
351 return 0;
352
353 type = acpi_get_bus_type(dev);
354 if (type && type->cleanup)
355 type->cleanup(dev);
356 else if (adev->handler && adev->handler->unbind)
357 adev->handler->unbind(dev);
358
359 acpi_unbind_one(dev);
360 return 0;
361}
362
363int acpi_platform_notify(struct device *dev, enum kobject_action action)
364{
365 switch (action) {
366 case KOBJ_ADD:
367 acpi_device_notify(dev);
368 break;
369 case KOBJ_REMOVE:
370 acpi_device_notify_remove(dev);
371 break;
372 default:
373 break;
374 }
375 return 0;
376}
1/*
2 * Link physical devices with ACPI devices support
3 *
4 * Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
5 * Copyright (c) 2005 Intel Corp.
6 *
7 * This file is released under the GPLv2.
8 */
9#include <linux/export.h>
10#include <linux/init.h>
11#include <linux/list.h>
12#include <linux/device.h>
13#include <linux/slab.h>
14#include <linux/rwsem.h>
15#include <linux/acpi.h>
16
17#include "internal.h"
18
19#define ACPI_GLUE_DEBUG 0
20#if ACPI_GLUE_DEBUG
21#define DBG(fmt, ...) \
22 printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__)
23#else
24#define DBG(fmt, ...) \
25do { \
26 if (0) \
27 printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__); \
28} while (0)
29#endif
30static LIST_HEAD(bus_type_list);
31static DECLARE_RWSEM(bus_type_sem);
32
33#define PHYSICAL_NODE_STRING "physical_node"
34#define PHYSICAL_NODE_NAME_SIZE (sizeof(PHYSICAL_NODE_STRING) + 10)
35
36int register_acpi_bus_type(struct acpi_bus_type *type)
37{
38 if (acpi_disabled)
39 return -ENODEV;
40 if (type && type->match && type->find_companion) {
41 down_write(&bus_type_sem);
42 list_add_tail(&type->list, &bus_type_list);
43 up_write(&bus_type_sem);
44 printk(KERN_INFO PREFIX "bus type %s registered\n", type->name);
45 return 0;
46 }
47 return -ENODEV;
48}
49EXPORT_SYMBOL_GPL(register_acpi_bus_type);
50
51int unregister_acpi_bus_type(struct acpi_bus_type *type)
52{
53 if (acpi_disabled)
54 return 0;
55 if (type) {
56 down_write(&bus_type_sem);
57 list_del_init(&type->list);
58 up_write(&bus_type_sem);
59 printk(KERN_INFO PREFIX "bus type %s unregistered\n",
60 type->name);
61 return 0;
62 }
63 return -ENODEV;
64}
65EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
66
67static struct acpi_bus_type *acpi_get_bus_type(struct device *dev)
68{
69 struct acpi_bus_type *tmp, *ret = NULL;
70
71 down_read(&bus_type_sem);
72 list_for_each_entry(tmp, &bus_type_list, list) {
73 if (tmp->match(dev)) {
74 ret = tmp;
75 break;
76 }
77 }
78 up_read(&bus_type_sem);
79 return ret;
80}
81
82#define FIND_CHILD_MIN_SCORE 1
83#define FIND_CHILD_MAX_SCORE 2
84
85static int find_child_checks(struct acpi_device *adev, bool check_children)
86{
87 bool sta_present = true;
88 unsigned long long sta;
89 acpi_status status;
90
91 status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
92 if (status == AE_NOT_FOUND)
93 sta_present = false;
94 else if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED))
95 return -ENODEV;
96
97 if (check_children && list_empty(&adev->children))
98 return -ENODEV;
99
100 return sta_present ? FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE;
101}
102
103struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
104 u64 address, bool check_children)
105{
106 struct acpi_device *adev, *ret = NULL;
107 int ret_score = 0;
108
109 if (!parent)
110 return NULL;
111
112 list_for_each_entry(adev, &parent->children, node) {
113 unsigned long long addr;
114 acpi_status status;
115 int score;
116
117 status = acpi_evaluate_integer(adev->handle, METHOD_NAME__ADR,
118 NULL, &addr);
119 if (ACPI_FAILURE(status) || addr != address)
120 continue;
121
122 if (!ret) {
123 /* This is the first matching object. Save it. */
124 ret = adev;
125 continue;
126 }
127 /*
128 * There is more than one matching device object with the same
129 * _ADR value. That really is unexpected, so we are kind of
130 * beyond the scope of the spec here. We have to choose which
131 * one to return, though.
132 *
133 * First, check if the previously found object is good enough
134 * and return it if so. Second, do the same for the object that
135 * we've just found.
136 */
137 if (!ret_score) {
138 ret_score = find_child_checks(ret, check_children);
139 if (ret_score == FIND_CHILD_MAX_SCORE)
140 return ret;
141 }
142 score = find_child_checks(adev, check_children);
143 if (score == FIND_CHILD_MAX_SCORE) {
144 return adev;
145 } else if (score > ret_score) {
146 ret = adev;
147 ret_score = score;
148 }
149 }
150 return ret;
151}
152EXPORT_SYMBOL_GPL(acpi_find_child_device);
153
154static void acpi_physnode_link_name(char *buf, unsigned int node_id)
155{
156 if (node_id > 0)
157 snprintf(buf, PHYSICAL_NODE_NAME_SIZE,
158 PHYSICAL_NODE_STRING "%u", node_id);
159 else
160 strcpy(buf, PHYSICAL_NODE_STRING);
161}
162
163int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
164{
165 struct acpi_device_physical_node *physical_node, *pn;
166 char physical_node_name[PHYSICAL_NODE_NAME_SIZE];
167 struct list_head *physnode_list;
168 unsigned int node_id;
169 int retval = -EINVAL;
170
171 if (ACPI_COMPANION(dev)) {
172 if (acpi_dev) {
173 dev_warn(dev, "ACPI companion already set\n");
174 return -EINVAL;
175 } else {
176 acpi_dev = ACPI_COMPANION(dev);
177 }
178 }
179 if (!acpi_dev)
180 return -EINVAL;
181
182 get_device(&acpi_dev->dev);
183 get_device(dev);
184 physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
185 if (!physical_node) {
186 retval = -ENOMEM;
187 goto err;
188 }
189
190 mutex_lock(&acpi_dev->physical_node_lock);
191
192 /*
193 * Keep the list sorted by node_id so that the IDs of removed nodes can
194 * be recycled easily.
195 */
196 physnode_list = &acpi_dev->physical_node_list;
197 node_id = 0;
198 list_for_each_entry(pn, &acpi_dev->physical_node_list, node) {
199 /* Sanity check. */
200 if (pn->dev == dev) {
201 mutex_unlock(&acpi_dev->physical_node_lock);
202
203 dev_warn(dev, "Already associated with ACPI node\n");
204 kfree(physical_node);
205 if (ACPI_COMPANION(dev) != acpi_dev)
206 goto err;
207
208 put_device(dev);
209 put_device(&acpi_dev->dev);
210 return 0;
211 }
212 if (pn->node_id == node_id) {
213 physnode_list = &pn->node;
214 node_id++;
215 }
216 }
217
218 physical_node->node_id = node_id;
219 physical_node->dev = dev;
220 list_add(&physical_node->node, physnode_list);
221 acpi_dev->physical_node_count++;
222
223 if (!ACPI_COMPANION(dev))
224 ACPI_COMPANION_SET(dev, acpi_dev);
225
226 acpi_physnode_link_name(physical_node_name, node_id);
227 retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
228 physical_node_name);
229 if (retval)
230 dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n",
231 physical_node_name, retval);
232
233 retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
234 "firmware_node");
235 if (retval)
236 dev_err(dev, "Failed to create link firmware_node (%d)\n",
237 retval);
238
239 mutex_unlock(&acpi_dev->physical_node_lock);
240
241 if (acpi_dev->wakeup.flags.valid)
242 device_set_wakeup_capable(dev, true);
243
244 return 0;
245
246 err:
247 ACPI_COMPANION_SET(dev, NULL);
248 put_device(dev);
249 put_device(&acpi_dev->dev);
250 return retval;
251}
252EXPORT_SYMBOL_GPL(acpi_bind_one);
253
254int acpi_unbind_one(struct device *dev)
255{
256 struct acpi_device *acpi_dev = ACPI_COMPANION(dev);
257 struct acpi_device_physical_node *entry;
258
259 if (!acpi_dev)
260 return 0;
261
262 mutex_lock(&acpi_dev->physical_node_lock);
263
264 list_for_each_entry(entry, &acpi_dev->physical_node_list, node)
265 if (entry->dev == dev) {
266 char physnode_name[PHYSICAL_NODE_NAME_SIZE];
267
268 list_del(&entry->node);
269 acpi_dev->physical_node_count--;
270
271 acpi_physnode_link_name(physnode_name, entry->node_id);
272 sysfs_remove_link(&acpi_dev->dev.kobj, physnode_name);
273 sysfs_remove_link(&dev->kobj, "firmware_node");
274 ACPI_COMPANION_SET(dev, NULL);
275 /* Drop references taken by acpi_bind_one(). */
276 put_device(dev);
277 put_device(&acpi_dev->dev);
278 kfree(entry);
279 break;
280 }
281
282 mutex_unlock(&acpi_dev->physical_node_lock);
283 return 0;
284}
285EXPORT_SYMBOL_GPL(acpi_unbind_one);
286
287static int acpi_platform_notify(struct device *dev)
288{
289 struct acpi_bus_type *type = acpi_get_bus_type(dev);
290 struct acpi_device *adev;
291 int ret;
292
293 ret = acpi_bind_one(dev, NULL);
294 if (ret && type) {
295 struct acpi_device *adev;
296
297 adev = type->find_companion(dev);
298 if (!adev) {
299 DBG("Unable to get handle for %s\n", dev_name(dev));
300 ret = -ENODEV;
301 goto out;
302 }
303 ret = acpi_bind_one(dev, adev);
304 if (ret)
305 goto out;
306 }
307 adev = ACPI_COMPANION(dev);
308 if (!adev)
309 goto out;
310
311 if (type && type->setup)
312 type->setup(dev);
313 else if (adev->handler && adev->handler->bind)
314 adev->handler->bind(dev);
315
316 out:
317#if ACPI_GLUE_DEBUG
318 if (!ret) {
319 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
320
321 acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
322 DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
323 kfree(buffer.pointer);
324 } else
325 DBG("Device %s -> No ACPI support\n", dev_name(dev));
326#endif
327
328 return ret;
329}
330
331static int acpi_platform_notify_remove(struct device *dev)
332{
333 struct acpi_device *adev = ACPI_COMPANION(dev);
334 struct acpi_bus_type *type;
335
336 if (!adev)
337 return 0;
338
339 type = acpi_get_bus_type(dev);
340 if (type && type->cleanup)
341 type->cleanup(dev);
342 else if (adev->handler && adev->handler->unbind)
343 adev->handler->unbind(dev);
344
345 acpi_unbind_one(dev);
346 return 0;
347}
348
349int __init init_acpi_device_notify(void)
350{
351 if (platform_notify || platform_notify_remove) {
352 printk(KERN_ERR PREFIX "Can't use platform_notify\n");
353 return 0;
354 }
355 platform_notify = acpi_platform_notify;
356 platform_notify_remove = acpi_platform_notify_remove;
357 return 0;
358}