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Commit | Line | Data |
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4e10d12a DSL |
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 | */ | |
6b81bed4 HG |
9 | |
10 | #include <linux/acpi_iort.h> | |
214f2c90 | 11 | #include <linux/export.h> |
4e10d12a DSL |
12 | #include <linux/init.h> |
13 | #include <linux/list.h> | |
14 | #include <linux/device.h> | |
5a0e3ad6 | 15 | #include <linux/slab.h> |
4e10d12a DSL |
16 | #include <linux/rwsem.h> |
17 | #include <linux/acpi.h> | |
d0562674 | 18 | #include <linux/dma-mapping.h> |
6b81bed4 | 19 | #include <linux/platform_device.h> |
4e10d12a | 20 | |
a192a958 LB |
21 | #include "internal.h" |
22 | ||
4e10d12a DSL |
23 | #define ACPI_GLUE_DEBUG 0 |
24 | #if ACPI_GLUE_DEBUG | |
23415eb5 JP |
25 | #define DBG(fmt, ...) \ |
26 | printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__) | |
4e10d12a | 27 | #else |
23415eb5 JP |
28 | #define DBG(fmt, ...) \ |
29 | do { \ | |
30 | if (0) \ | |
31 | printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__); \ | |
32 | } while (0) | |
4e10d12a DSL |
33 | #endif |
34 | static LIST_HEAD(bus_type_list); | |
35 | static DECLARE_RWSEM(bus_type_sem); | |
36 | ||
1033f904 | 37 | #define PHYSICAL_NODE_STRING "physical_node" |
007ccfcf | 38 | #define PHYSICAL_NODE_NAME_SIZE (sizeof(PHYSICAL_NODE_STRING) + 10) |
1033f904 | 39 | |
4e10d12a DSL |
40 | int register_acpi_bus_type(struct acpi_bus_type *type) |
41 | { | |
42 | if (acpi_disabled) | |
43 | return -ENODEV; | |
e3f02c52 | 44 | if (type && type->match && type->find_companion) { |
4e10d12a DSL |
45 | down_write(&bus_type_sem); |
46 | list_add_tail(&type->list, &bus_type_list); | |
47 | up_write(&bus_type_sem); | |
53540098 | 48 | printk(KERN_INFO PREFIX "bus type %s registered\n", type->name); |
4e10d12a DSL |
49 | return 0; |
50 | } | |
51 | return -ENODEV; | |
52 | } | |
91e4d5a1 | 53 | EXPORT_SYMBOL_GPL(register_acpi_bus_type); |
4e10d12a | 54 | |
4e10d12a DSL |
55 | int unregister_acpi_bus_type(struct acpi_bus_type *type) |
56 | { | |
57 | if (acpi_disabled) | |
58 | return 0; | |
59 | if (type) { | |
60 | down_write(&bus_type_sem); | |
61 | list_del_init(&type->list); | |
62 | up_write(&bus_type_sem); | |
53540098 RW |
63 | printk(KERN_INFO PREFIX "bus type %s unregistered\n", |
64 | type->name); | |
4e10d12a DSL |
65 | return 0; |
66 | } | |
67 | return -ENODEV; | |
68 | } | |
91e4d5a1 | 69 | EXPORT_SYMBOL_GPL(unregister_acpi_bus_type); |
4e10d12a | 70 | |
53540098 | 71 | static struct acpi_bus_type *acpi_get_bus_type(struct device *dev) |
4e10d12a DSL |
72 | { |
73 | struct acpi_bus_type *tmp, *ret = NULL; | |
74 | ||
75 | down_read(&bus_type_sem); | |
76 | list_for_each_entry(tmp, &bus_type_list, list) { | |
53540098 | 77 | if (tmp->match(dev)) { |
4e10d12a DSL |
78 | ret = tmp; |
79 | break; | |
80 | } | |
81 | } | |
82 | up_read(&bus_type_sem); | |
83 | return ret; | |
84 | } | |
85 | ||
11b88ee2 RW |
86 | #define FIND_CHILD_MIN_SCORE 1 |
87 | #define FIND_CHILD_MAX_SCORE 2 | |
88 | ||
d9fef0c4 | 89 | static int find_child_checks(struct acpi_device *adev, bool check_children) |
60f75b8e | 90 | { |
11b88ee2 | 91 | bool sta_present = true; |
60f75b8e RW |
92 | unsigned long long sta; |
93 | acpi_status status; | |
94 | ||
d9fef0c4 | 95 | status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta); |
11b88ee2 RW |
96 | if (status == AE_NOT_FOUND) |
97 | sta_present = false; | |
98 | else if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED)) | |
99 | return -ENODEV; | |
60f75b8e | 100 | |
d9fef0c4 RW |
101 | if (check_children && list_empty(&adev->children)) |
102 | return -ENODEV; | |
60f75b8e | 103 | |
c2a6bbaf | 104 | /* |
6912abb2 RW |
105 | * If the device has a _HID returning a valid ACPI/PNP device ID, it is |
106 | * better to make it look less attractive here, so that the other device | |
107 | * with the same _ADR value (that may not have a valid device ID) can be | |
108 | * matched going forward. [This means a second spec violation in a row, | |
109 | * so whatever we do here is best effort anyway.] | |
c2a6bbaf | 110 | */ |
6912abb2 | 111 | return sta_present && !adev->pnp.type.platform_id ? |
c2a6bbaf | 112 | FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE; |
60f75b8e RW |
113 | } |
114 | ||
d9fef0c4 RW |
115 | struct acpi_device *acpi_find_child_device(struct acpi_device *parent, |
116 | u64 address, bool check_children) | |
60f75b8e | 117 | { |
d9fef0c4 RW |
118 | struct acpi_device *adev, *ret = NULL; |
119 | int ret_score = 0; | |
120 | ||
5ce79d20 RW |
121 | if (!parent) |
122 | return NULL; | |
123 | ||
d9fef0c4 RW |
124 | list_for_each_entry(adev, &parent->children, node) { |
125 | unsigned long long addr; | |
126 | acpi_status status; | |
127 | int score; | |
128 | ||
129 | status = acpi_evaluate_integer(adev->handle, METHOD_NAME__ADR, | |
130 | NULL, &addr); | |
131 | if (ACPI_FAILURE(status) || addr != address) | |
132 | continue; | |
133 | ||
134 | if (!ret) { | |
135 | /* This is the first matching object. Save it. */ | |
136 | ret = adev; | |
137 | continue; | |
138 | } | |
139 | /* | |
140 | * There is more than one matching device object with the same | |
141 | * _ADR value. That really is unexpected, so we are kind of | |
142 | * beyond the scope of the spec here. We have to choose which | |
143 | * one to return, though. | |
144 | * | |
145 | * First, check if the previously found object is good enough | |
146 | * and return it if so. Second, do the same for the object that | |
147 | * we've just found. | |
148 | */ | |
149 | if (!ret_score) { | |
150 | ret_score = find_child_checks(ret, check_children); | |
151 | if (ret_score == FIND_CHILD_MAX_SCORE) | |
152 | return ret; | |
153 | } | |
154 | score = find_child_checks(adev, check_children); | |
155 | if (score == FIND_CHILD_MAX_SCORE) { | |
156 | return adev; | |
157 | } else if (score > ret_score) { | |
158 | ret = adev; | |
159 | ret_score = score; | |
160 | } | |
4e10d12a | 161 | } |
d9fef0c4 | 162 | return ret; |
4e10d12a | 163 | } |
9c5ad36d | 164 | EXPORT_SYMBOL_GPL(acpi_find_child_device); |
4e10d12a | 165 | |
bdbdbf91 RW |
166 | static void acpi_physnode_link_name(char *buf, unsigned int node_id) |
167 | { | |
168 | if (node_id > 0) | |
169 | snprintf(buf, PHYSICAL_NODE_NAME_SIZE, | |
170 | PHYSICAL_NODE_STRING "%u", node_id); | |
171 | else | |
172 | strcpy(buf, PHYSICAL_NODE_STRING); | |
173 | } | |
174 | ||
24dee1fc | 175 | int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev) |
4e10d12a | 176 | { |
f3fd0c8a | 177 | struct acpi_device_physical_node *physical_node, *pn; |
007ccfcf RW |
178 | char physical_node_name[PHYSICAL_NODE_NAME_SIZE]; |
179 | struct list_head *physnode_list; | |
180 | unsigned int node_id; | |
1033f904 | 181 | int retval = -EINVAL; |
1831eff8 | 182 | enum dev_dma_attr attr; |
4e10d12a | 183 | |
ca5b74d2 | 184 | if (has_acpi_companion(dev)) { |
24dee1fc | 185 | if (acpi_dev) { |
7b199811 | 186 | dev_warn(dev, "ACPI companion already set\n"); |
f3fd0c8a RW |
187 | return -EINVAL; |
188 | } else { | |
7b199811 | 189 | acpi_dev = ACPI_COMPANION(dev); |
f3fd0c8a | 190 | } |
4e10d12a | 191 | } |
7b199811 | 192 | if (!acpi_dev) |
f3fd0c8a | 193 | return -EINVAL; |
1033f904 | 194 | |
a104b4d4 | 195 | get_device(&acpi_dev->dev); |
4e10d12a | 196 | get_device(dev); |
f3fd0c8a | 197 | physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL); |
1033f904 LT |
198 | if (!physical_node) { |
199 | retval = -ENOMEM; | |
200 | goto err; | |
4e10d12a | 201 | } |
4e10d12a | 202 | |
1033f904 | 203 | mutex_lock(&acpi_dev->physical_node_lock); |
f3fd0c8a | 204 | |
007ccfcf RW |
205 | /* |
206 | * Keep the list sorted by node_id so that the IDs of removed nodes can | |
207 | * be recycled easily. | |
208 | */ | |
209 | physnode_list = &acpi_dev->physical_node_list; | |
210 | node_id = 0; | |
211 | list_for_each_entry(pn, &acpi_dev->physical_node_list, node) { | |
212 | /* Sanity check. */ | |
f3fd0c8a | 213 | if (pn->dev == dev) { |
3342c753 RW |
214 | mutex_unlock(&acpi_dev->physical_node_lock); |
215 | ||
f3fd0c8a | 216 | dev_warn(dev, "Already associated with ACPI node\n"); |
3342c753 | 217 | kfree(physical_node); |
7b199811 | 218 | if (ACPI_COMPANION(dev) != acpi_dev) |
3342c753 | 219 | goto err; |
3fe444ad | 220 | |
3342c753 | 221 | put_device(dev); |
a104b4d4 | 222 | put_device(&acpi_dev->dev); |
3342c753 | 223 | return 0; |
f3fd0c8a | 224 | } |
007ccfcf RW |
225 | if (pn->node_id == node_id) { |
226 | physnode_list = &pn->node; | |
227 | node_id++; | |
228 | } | |
1071695f DB |
229 | } |
230 | ||
007ccfcf | 231 | physical_node->node_id = node_id; |
1033f904 | 232 | physical_node->dev = dev; |
007ccfcf | 233 | list_add(&physical_node->node, physnode_list); |
1033f904 | 234 | acpi_dev->physical_node_count++; |
f3fd0c8a | 235 | |
ca5b74d2 | 236 | if (!has_acpi_companion(dev)) |
7b199811 | 237 | ACPI_COMPANION_SET(dev, acpi_dev); |
1033f904 | 238 | |
1831eff8 SS |
239 | attr = acpi_get_dma_attr(acpi_dev); |
240 | if (attr != DEV_DMA_NOT_SUPPORTED) | |
d760a1ba | 241 | acpi_dma_configure(dev, attr); |
d0562674 | 242 | |
bdbdbf91 | 243 | acpi_physnode_link_name(physical_node_name, node_id); |
1033f904 | 244 | retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, |
f501b6ec | 245 | physical_node_name); |
464c1147 RW |
246 | if (retval) |
247 | dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n", | |
248 | physical_node_name, retval); | |
249 | ||
1033f904 | 250 | retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj, |
f501b6ec | 251 | "firmware_node"); |
464c1147 RW |
252 | if (retval) |
253 | dev_err(dev, "Failed to create link firmware_node (%d)\n", | |
254 | retval); | |
1033f904 | 255 | |
40055206 RW |
256 | mutex_unlock(&acpi_dev->physical_node_lock); |
257 | ||
1033f904 LT |
258 | if (acpi_dev->wakeup.flags.valid) |
259 | device_set_wakeup_capable(dev, true); | |
260 | ||
4e10d12a | 261 | return 0; |
1033f904 LT |
262 | |
263 | err: | |
7b199811 | 264 | ACPI_COMPANION_SET(dev, NULL); |
1033f904 | 265 | put_device(dev); |
a104b4d4 | 266 | put_device(&acpi_dev->dev); |
1033f904 | 267 | return retval; |
4e10d12a | 268 | } |
ac212b69 | 269 | EXPORT_SYMBOL_GPL(acpi_bind_one); |
4e10d12a | 270 | |
ac212b69 | 271 | int acpi_unbind_one(struct device *dev) |
4e10d12a | 272 | { |
7b199811 | 273 | struct acpi_device *acpi_dev = ACPI_COMPANION(dev); |
1033f904 | 274 | struct acpi_device_physical_node *entry; |
1033f904 | 275 | |
7b199811 | 276 | if (!acpi_dev) |
4e10d12a | 277 | return 0; |
1071695f | 278 | |
1033f904 | 279 | mutex_lock(&acpi_dev->physical_node_lock); |
3e332783 RW |
280 | |
281 | list_for_each_entry(entry, &acpi_dev->physical_node_list, node) | |
282 | if (entry->dev == dev) { | |
283 | char physnode_name[PHYSICAL_NODE_NAME_SIZE]; | |
284 | ||
285 | list_del(&entry->node); | |
286 | acpi_dev->physical_node_count--; | |
287 | ||
288 | acpi_physnode_link_name(physnode_name, entry->node_id); | |
289 | sysfs_remove_link(&acpi_dev->dev.kobj, physnode_name); | |
290 | sysfs_remove_link(&dev->kobj, "firmware_node"); | |
7b199811 | 291 | ACPI_COMPANION_SET(dev, NULL); |
a104b4d4 | 292 | /* Drop references taken by acpi_bind_one(). */ |
3e332783 | 293 | put_device(dev); |
a104b4d4 | 294 | put_device(&acpi_dev->dev); |
3e332783 RW |
295 | kfree(entry); |
296 | break; | |
297 | } | |
298 | ||
1033f904 | 299 | mutex_unlock(&acpi_dev->physical_node_lock); |
4e10d12a DSL |
300 | return 0; |
301 | } | |
ac212b69 | 302 | EXPORT_SYMBOL_GPL(acpi_unbind_one); |
4e10d12a DSL |
303 | |
304 | static int acpi_platform_notify(struct device *dev) | |
305 | { | |
53540098 | 306 | struct acpi_bus_type *type = acpi_get_bus_type(dev); |
9cb32acf | 307 | struct acpi_device *adev; |
11909ca1 | 308 | int ret; |
4e10d12a | 309 | |
f3fd0c8a | 310 | ret = acpi_bind_one(dev, NULL); |
92414481 | 311 | if (ret && type) { |
e3f02c52 RW |
312 | struct acpi_device *adev; |
313 | ||
314 | adev = type->find_companion(dev); | |
315 | if (!adev) { | |
11909ca1 | 316 | DBG("Unable to get handle for %s\n", dev_name(dev)); |
e3f02c52 | 317 | ret = -ENODEV; |
11909ca1 RW |
318 | goto out; |
319 | } | |
24dee1fc | 320 | ret = acpi_bind_one(dev, adev); |
11909ca1 RW |
321 | if (ret) |
322 | goto out; | |
4e10d12a | 323 | } |
9cb32acf RW |
324 | adev = ACPI_COMPANION(dev); |
325 | if (!adev) | |
326 | goto out; | |
11909ca1 | 327 | |
6b81bed4 HG |
328 | if (dev->bus == &platform_bus_type) |
329 | acpi_configure_pmsi_domain(dev); | |
330 | ||
11909ca1 RW |
331 | if (type && type->setup) |
332 | type->setup(dev); | |
9cb32acf RW |
333 | else if (adev->handler && adev->handler->bind) |
334 | adev->handler->bind(dev); | |
4e10d12a | 335 | |
f3fd0c8a | 336 | out: |
4e10d12a DSL |
337 | #if ACPI_GLUE_DEBUG |
338 | if (!ret) { | |
339 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
340 | ||
a412a11d | 341 | acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer); |
db1461ad | 342 | DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer); |
02438d87 | 343 | kfree(buffer.pointer); |
4e10d12a | 344 | } else |
db1461ad | 345 | DBG("Device %s -> No ACPI support\n", dev_name(dev)); |
4e10d12a DSL |
346 | #endif |
347 | ||
348 | return ret; | |
349 | } | |
350 | ||
351 | static int acpi_platform_notify_remove(struct device *dev) | |
352 | { | |
9cb32acf | 353 | struct acpi_device *adev = ACPI_COMPANION(dev); |
11909ca1 RW |
354 | struct acpi_bus_type *type; |
355 | ||
9cb32acf RW |
356 | if (!adev) |
357 | return 0; | |
358 | ||
53540098 | 359 | type = acpi_get_bus_type(dev); |
11909ca1 RW |
360 | if (type && type->cleanup) |
361 | type->cleanup(dev); | |
9cb32acf RW |
362 | else if (adev->handler && adev->handler->unbind) |
363 | adev->handler->unbind(dev); | |
11909ca1 | 364 | |
4e10d12a DSL |
365 | acpi_unbind_one(dev); |
366 | return 0; | |
367 | } | |
368 | ||
c33cab60 | 369 | void __init init_acpi_device_notify(void) |
4e10d12a | 370 | { |
4e10d12a DSL |
371 | if (platform_notify || platform_notify_remove) { |
372 | printk(KERN_ERR PREFIX "Can't use platform_notify\n"); | |
c33cab60 | 373 | return; |
4e10d12a DSL |
374 | } |
375 | platform_notify = acpi_platform_notify; | |
376 | platform_notify_remove = acpi_platform_notify_remove; | |
4e10d12a | 377 | } |