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Commit | Line | Data |
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55716d26 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
4e10d12a DSL |
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. | |
4e10d12a | 7 | */ |
d4f54a18 HG |
8 | |
9 | #include <linux/acpi_iort.h> | |
214f2c90 | 10 | #include <linux/export.h> |
4e10d12a DSL |
11 | #include <linux/init.h> |
12 | #include <linux/list.h> | |
13 | #include <linux/device.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
4e10d12a DSL |
15 | #include <linux/rwsem.h> |
16 | #include <linux/acpi.h> | |
d0562674 | 17 | #include <linux/dma-mapping.h> |
d4f54a18 | 18 | #include <linux/platform_device.h> |
4e10d12a | 19 | |
a192a958 LB |
20 | #include "internal.h" |
21 | ||
4e10d12a DSL |
22 | #define ACPI_GLUE_DEBUG 0 |
23 | #if ACPI_GLUE_DEBUG | |
23415eb5 JP |
24 | #define DBG(fmt, ...) \ |
25 | printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__) | |
4e10d12a | 26 | #else |
23415eb5 JP |
27 | #define DBG(fmt, ...) \ |
28 | do { \ | |
29 | if (0) \ | |
30 | printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__); \ | |
31 | } while (0) | |
4e10d12a DSL |
32 | #endif |
33 | static LIST_HEAD(bus_type_list); | |
34 | static DECLARE_RWSEM(bus_type_sem); | |
35 | ||
1033f904 | 36 | #define PHYSICAL_NODE_STRING "physical_node" |
007ccfcf | 37 | #define PHYSICAL_NODE_NAME_SIZE (sizeof(PHYSICAL_NODE_STRING) + 10) |
1033f904 | 38 | |
4e10d12a DSL |
39 | int register_acpi_bus_type(struct acpi_bus_type *type) |
40 | { | |
41 | if (acpi_disabled) | |
42 | return -ENODEV; | |
e3f02c52 | 43 | if (type && type->match && type->find_companion) { |
4e10d12a DSL |
44 | down_write(&bus_type_sem); |
45 | list_add_tail(&type->list, &bus_type_list); | |
46 | up_write(&bus_type_sem); | |
53540098 | 47 | printk(KERN_INFO PREFIX "bus type %s registered\n", type->name); |
4e10d12a DSL |
48 | return 0; |
49 | } | |
50 | return -ENODEV; | |
51 | } | |
91e4d5a1 | 52 | EXPORT_SYMBOL_GPL(register_acpi_bus_type); |
4e10d12a | 53 | |
4e10d12a DSL |
54 | int 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); | |
53540098 RW |
62 | printk(KERN_INFO PREFIX "bus type %s unregistered\n", |
63 | type->name); | |
4e10d12a DSL |
64 | return 0; |
65 | } | |
66 | return -ENODEV; | |
67 | } | |
91e4d5a1 | 68 | EXPORT_SYMBOL_GPL(unregister_acpi_bus_type); |
4e10d12a | 69 | |
53540098 | 70 | static struct acpi_bus_type *acpi_get_bus_type(struct device *dev) |
4e10d12a DSL |
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) { | |
53540098 | 76 | if (tmp->match(dev)) { |
4e10d12a DSL |
77 | ret = tmp; |
78 | break; | |
79 | } | |
80 | } | |
81 | up_read(&bus_type_sem); | |
82 | return ret; | |
83 | } | |
84 | ||
11b88ee2 RW |
85 | #define FIND_CHILD_MIN_SCORE 1 |
86 | #define FIND_CHILD_MAX_SCORE 2 | |
87 | ||
d9fef0c4 | 88 | static int find_child_checks(struct acpi_device *adev, bool check_children) |
60f75b8e | 89 | { |
11b88ee2 | 90 | bool sta_present = true; |
60f75b8e RW |
91 | unsigned long long sta; |
92 | acpi_status status; | |
93 | ||
d9fef0c4 | 94 | status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta); |
11b88ee2 RW |
95 | if (status == AE_NOT_FOUND) |
96 | sta_present = false; | |
97 | else if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED)) | |
98 | return -ENODEV; | |
60f75b8e | 99 | |
d9fef0c4 RW |
100 | if (check_children && list_empty(&adev->children)) |
101 | return -ENODEV; | |
60f75b8e | 102 | |
c2a6bbaf | 103 | /* |
fdad4e7a RW |
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.] | |
c2a6bbaf | 109 | */ |
fdad4e7a | 110 | return sta_present && !adev->pnp.type.platform_id ? |
c2a6bbaf | 111 | FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE; |
60f75b8e RW |
112 | } |
113 | ||
d9fef0c4 RW |
114 | struct acpi_device *acpi_find_child_device(struct acpi_device *parent, |
115 | u64 address, bool check_children) | |
60f75b8e | 116 | { |
d9fef0c4 RW |
117 | struct acpi_device *adev, *ret = NULL; |
118 | int ret_score = 0; | |
119 | ||
5ce79d20 RW |
120 | if (!parent) |
121 | return NULL; | |
122 | ||
d9fef0c4 RW |
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 | } | |
4e10d12a | 160 | } |
d9fef0c4 | 161 | return ret; |
4e10d12a | 162 | } |
9c5ad36d | 163 | EXPORT_SYMBOL_GPL(acpi_find_child_device); |
4e10d12a | 164 | |
bdbdbf91 RW |
165 | static 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 | ||
24dee1fc | 174 | int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev) |
4e10d12a | 175 | { |
f3fd0c8a | 176 | struct acpi_device_physical_node *physical_node, *pn; |
007ccfcf RW |
177 | char physical_node_name[PHYSICAL_NODE_NAME_SIZE]; |
178 | struct list_head *physnode_list; | |
179 | unsigned int node_id; | |
1033f904 | 180 | int retval = -EINVAL; |
4e10d12a | 181 | |
ca5b74d2 | 182 | if (has_acpi_companion(dev)) { |
24dee1fc | 183 | if (acpi_dev) { |
7b199811 | 184 | dev_warn(dev, "ACPI companion already set\n"); |
f3fd0c8a RW |
185 | return -EINVAL; |
186 | } else { | |
7b199811 | 187 | acpi_dev = ACPI_COMPANION(dev); |
f3fd0c8a | 188 | } |
4e10d12a | 189 | } |
7b199811 | 190 | if (!acpi_dev) |
f3fd0c8a | 191 | return -EINVAL; |
1033f904 | 192 | |
a104b4d4 | 193 | get_device(&acpi_dev->dev); |
4e10d12a | 194 | get_device(dev); |
f3fd0c8a | 195 | physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL); |
1033f904 LT |
196 | if (!physical_node) { |
197 | retval = -ENOMEM; | |
198 | goto err; | |
4e10d12a | 199 | } |
4e10d12a | 200 | |
1033f904 | 201 | mutex_lock(&acpi_dev->physical_node_lock); |
f3fd0c8a | 202 | |
007ccfcf RW |
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. */ | |
f3fd0c8a | 211 | if (pn->dev == dev) { |
3342c753 RW |
212 | mutex_unlock(&acpi_dev->physical_node_lock); |
213 | ||
f3fd0c8a | 214 | dev_warn(dev, "Already associated with ACPI node\n"); |
3342c753 | 215 | kfree(physical_node); |
7b199811 | 216 | if (ACPI_COMPANION(dev) != acpi_dev) |
3342c753 | 217 | goto err; |
3fe444ad | 218 | |
3342c753 | 219 | put_device(dev); |
a104b4d4 | 220 | put_device(&acpi_dev->dev); |
3342c753 | 221 | return 0; |
f3fd0c8a | 222 | } |
007ccfcf RW |
223 | if (pn->node_id == node_id) { |
224 | physnode_list = &pn->node; | |
225 | node_id++; | |
226 | } | |
1071695f DB |
227 | } |
228 | ||
007ccfcf | 229 | physical_node->node_id = node_id; |
1033f904 | 230 | physical_node->dev = dev; |
007ccfcf | 231 | list_add(&physical_node->node, physnode_list); |
1033f904 | 232 | acpi_dev->physical_node_count++; |
f3fd0c8a | 233 | |
ca5b74d2 | 234 | if (!has_acpi_companion(dev)) |
7b199811 | 235 | ACPI_COMPANION_SET(dev, acpi_dev); |
1033f904 | 236 | |
bdbdbf91 | 237 | acpi_physnode_link_name(physical_node_name, node_id); |
1033f904 | 238 | retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, |
f501b6ec | 239 | physical_node_name); |
464c1147 RW |
240 | if (retval) |
241 | dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n", | |
242 | physical_node_name, retval); | |
243 | ||
1033f904 | 244 | retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj, |
f501b6ec | 245 | "firmware_node"); |
464c1147 RW |
246 | if (retval) |
247 | dev_err(dev, "Failed to create link firmware_node (%d)\n", | |
248 | retval); | |
1033f904 | 249 | |
40055206 RW |
250 | mutex_unlock(&acpi_dev->physical_node_lock); |
251 | ||
1033f904 LT |
252 | if (acpi_dev->wakeup.flags.valid) |
253 | device_set_wakeup_capable(dev, true); | |
254 | ||
4e10d12a | 255 | return 0; |
1033f904 LT |
256 | |
257 | err: | |
7b199811 | 258 | ACPI_COMPANION_SET(dev, NULL); |
1033f904 | 259 | put_device(dev); |
a104b4d4 | 260 | put_device(&acpi_dev->dev); |
1033f904 | 261 | return retval; |
4e10d12a | 262 | } |
ac212b69 | 263 | EXPORT_SYMBOL_GPL(acpi_bind_one); |
4e10d12a | 264 | |
ac212b69 | 265 | int acpi_unbind_one(struct device *dev) |
4e10d12a | 266 | { |
7b199811 | 267 | struct acpi_device *acpi_dev = ACPI_COMPANION(dev); |
1033f904 | 268 | struct acpi_device_physical_node *entry; |
1033f904 | 269 | |
7b199811 | 270 | if (!acpi_dev) |
4e10d12a | 271 | return 0; |
1071695f | 272 | |
1033f904 | 273 | mutex_lock(&acpi_dev->physical_node_lock); |
3e332783 RW |
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"); | |
7b199811 | 285 | ACPI_COMPANION_SET(dev, NULL); |
a104b4d4 | 286 | /* Drop references taken by acpi_bind_one(). */ |
3e332783 | 287 | put_device(dev); |
a104b4d4 | 288 | put_device(&acpi_dev->dev); |
3e332783 RW |
289 | kfree(entry); |
290 | break; | |
291 | } | |
292 | ||
1033f904 | 293 | mutex_unlock(&acpi_dev->physical_node_lock); |
4e10d12a DSL |
294 | return 0; |
295 | } | |
ac212b69 | 296 | EXPORT_SYMBOL_GPL(acpi_unbind_one); |
4e10d12a | 297 | |
7847a145 | 298 | static int acpi_device_notify(struct device *dev) |
4e10d12a | 299 | { |
53540098 | 300 | struct acpi_bus_type *type = acpi_get_bus_type(dev); |
9cb32acf | 301 | struct acpi_device *adev; |
11909ca1 | 302 | int ret; |
4e10d12a | 303 | |
f3fd0c8a | 304 | ret = acpi_bind_one(dev, NULL); |
92414481 | 305 | if (ret && type) { |
e3f02c52 RW |
306 | struct acpi_device *adev; |
307 | ||
308 | adev = type->find_companion(dev); | |
309 | if (!adev) { | |
11909ca1 | 310 | DBG("Unable to get handle for %s\n", dev_name(dev)); |
e3f02c52 | 311 | ret = -ENODEV; |
11909ca1 RW |
312 | goto out; |
313 | } | |
24dee1fc | 314 | ret = acpi_bind_one(dev, adev); |
11909ca1 RW |
315 | if (ret) |
316 | goto out; | |
4e10d12a | 317 | } |
9cb32acf RW |
318 | adev = ACPI_COMPANION(dev); |
319 | if (!adev) | |
320 | goto out; | |
11909ca1 | 321 | |
719cf71c | 322 | if (dev_is_platform(dev)) |
d4f54a18 HG |
323 | acpi_configure_pmsi_domain(dev); |
324 | ||
11909ca1 RW |
325 | if (type && type->setup) |
326 | type->setup(dev); | |
9cb32acf RW |
327 | else if (adev->handler && adev->handler->bind) |
328 | adev->handler->bind(dev); | |
4e10d12a | 329 | |
f3fd0c8a | 330 | out: |
4e10d12a DSL |
331 | #if ACPI_GLUE_DEBUG |
332 | if (!ret) { | |
333 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
334 | ||
a412a11d | 335 | acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer); |
db1461ad | 336 | DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer); |
02438d87 | 337 | kfree(buffer.pointer); |
4e10d12a | 338 | } else |
db1461ad | 339 | DBG("Device %s -> No ACPI support\n", dev_name(dev)); |
4e10d12a DSL |
340 | #endif |
341 | ||
342 | return ret; | |
343 | } | |
344 | ||
7847a145 | 345 | static int acpi_device_notify_remove(struct device *dev) |
4e10d12a | 346 | { |
9cb32acf | 347 | struct acpi_device *adev = ACPI_COMPANION(dev); |
11909ca1 RW |
348 | struct acpi_bus_type *type; |
349 | ||
9cb32acf RW |
350 | if (!adev) |
351 | return 0; | |
352 | ||
53540098 | 353 | type = acpi_get_bus_type(dev); |
11909ca1 RW |
354 | if (type && type->cleanup) |
355 | type->cleanup(dev); | |
9cb32acf RW |
356 | else if (adev->handler && adev->handler->unbind) |
357 | adev->handler->unbind(dev); | |
11909ca1 | 358 | |
4e10d12a DSL |
359 | acpi_unbind_one(dev); |
360 | return 0; | |
361 | } | |
362 | ||
7847a145 | 363 | int acpi_platform_notify(struct device *dev, enum kobject_action action) |
4e10d12a | 364 | { |
7847a145 HK |
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; | |
4e10d12a | 374 | } |
7847a145 | 375 | return 0; |
4e10d12a | 376 | } |