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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 | ||
10 | #include <linux/acpi_iort.h> | |
11 | #include <linux/export.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/list.h> | |
14 | #include <linux/device.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/rwsem.h> | |
17 | #include <linux/acpi.h> | |
18 | #include <linux/dma-mapping.h> | |
19 | #include <linux/platform_device.h> | |
20 | ||
21 | #include "internal.h" | |
22 | ||
23 | #define ACPI_GLUE_DEBUG 0 | |
24 | #if ACPI_GLUE_DEBUG | |
25 | #define DBG(fmt, ...) \ | |
26 | printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__) | |
27 | #else | |
28 | #define DBG(fmt, ...) \ | |
29 | do { \ | |
30 | if (0) \ | |
31 | printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__); \ | |
32 | } while (0) | |
33 | #endif | |
34 | static LIST_HEAD(bus_type_list); | |
35 | static DECLARE_RWSEM(bus_type_sem); | |
36 | ||
37 | #define PHYSICAL_NODE_STRING "physical_node" | |
38 | #define PHYSICAL_NODE_NAME_SIZE (sizeof(PHYSICAL_NODE_STRING) + 10) | |
39 | ||
40 | int register_acpi_bus_type(struct acpi_bus_type *type) | |
41 | { | |
42 | if (acpi_disabled) | |
43 | return -ENODEV; | |
44 | if (type && type->match && type->find_companion) { | |
45 | down_write(&bus_type_sem); | |
46 | list_add_tail(&type->list, &bus_type_list); | |
47 | up_write(&bus_type_sem); | |
48 | printk(KERN_INFO PREFIX "bus type %s registered\n", type->name); | |
49 | return 0; | |
50 | } | |
51 | return -ENODEV; | |
52 | } | |
53 | EXPORT_SYMBOL_GPL(register_acpi_bus_type); | |
54 | ||
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); | |
63 | printk(KERN_INFO PREFIX "bus type %s unregistered\n", | |
64 | type->name); | |
65 | return 0; | |
66 | } | |
67 | return -ENODEV; | |
68 | } | |
69 | EXPORT_SYMBOL_GPL(unregister_acpi_bus_type); | |
70 | ||
71 | static struct acpi_bus_type *acpi_get_bus_type(struct device *dev) | |
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) { | |
77 | if (tmp->match(dev)) { | |
78 | ret = tmp; | |
79 | break; | |
80 | } | |
81 | } | |
82 | up_read(&bus_type_sem); | |
83 | return ret; | |
84 | } | |
85 | ||
86 | #define FIND_CHILD_MIN_SCORE 1 | |
87 | #define FIND_CHILD_MAX_SCORE 2 | |
88 | ||
89 | static int find_child_checks(struct acpi_device *adev, bool check_children) | |
90 | { | |
91 | bool sta_present = true; | |
92 | unsigned long long sta; | |
93 | acpi_status status; | |
94 | ||
95 | status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta); | |
96 | if (status == AE_NOT_FOUND) | |
97 | sta_present = false; | |
98 | else if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED)) | |
99 | return -ENODEV; | |
100 | ||
101 | if (check_children && list_empty(&adev->children)) | |
102 | return -ENODEV; | |
103 | ||
104 | /* | |
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.] | |
110 | */ | |
111 | return sta_present && !adev->pnp.type.platform_id ? | |
112 | FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE; | |
113 | } | |
114 | ||
115 | struct acpi_device *acpi_find_child_device(struct acpi_device *parent, | |
116 | u64 address, bool check_children) | |
117 | { | |
118 | struct acpi_device *adev, *ret = NULL; | |
119 | int ret_score = 0; | |
120 | ||
121 | if (!parent) | |
122 | return NULL; | |
123 | ||
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 | } | |
161 | } | |
162 | return ret; | |
163 | } | |
164 | EXPORT_SYMBOL_GPL(acpi_find_child_device); | |
165 | ||
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 | ||
175 | int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev) | |
176 | { | |
177 | struct acpi_device_physical_node *physical_node, *pn; | |
178 | char physical_node_name[PHYSICAL_NODE_NAME_SIZE]; | |
179 | struct list_head *physnode_list; | |
180 | unsigned int node_id; | |
181 | int retval = -EINVAL; | |
182 | enum dev_dma_attr attr; | |
183 | ||
184 | if (has_acpi_companion(dev)) { | |
185 | if (acpi_dev) { | |
186 | dev_warn(dev, "ACPI companion already set\n"); | |
187 | return -EINVAL; | |
188 | } else { | |
189 | acpi_dev = ACPI_COMPANION(dev); | |
190 | } | |
191 | } | |
192 | if (!acpi_dev) | |
193 | return -EINVAL; | |
194 | ||
195 | get_device(&acpi_dev->dev); | |
196 | get_device(dev); | |
197 | physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL); | |
198 | if (!physical_node) { | |
199 | retval = -ENOMEM; | |
200 | goto err; | |
201 | } | |
202 | ||
203 | mutex_lock(&acpi_dev->physical_node_lock); | |
204 | ||
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. */ | |
213 | if (pn->dev == dev) { | |
214 | mutex_unlock(&acpi_dev->physical_node_lock); | |
215 | ||
216 | dev_warn(dev, "Already associated with ACPI node\n"); | |
217 | kfree(physical_node); | |
218 | if (ACPI_COMPANION(dev) != acpi_dev) | |
219 | goto err; | |
220 | ||
221 | put_device(dev); | |
222 | put_device(&acpi_dev->dev); | |
223 | return 0; | |
224 | } | |
225 | if (pn->node_id == node_id) { | |
226 | physnode_list = &pn->node; | |
227 | node_id++; | |
228 | } | |
229 | } | |
230 | ||
231 | physical_node->node_id = node_id; | |
232 | physical_node->dev = dev; | |
233 | list_add(&physical_node->node, physnode_list); | |
234 | acpi_dev->physical_node_count++; | |
235 | ||
236 | if (!has_acpi_companion(dev)) | |
237 | ACPI_COMPANION_SET(dev, acpi_dev); | |
238 | ||
239 | attr = acpi_get_dma_attr(acpi_dev); | |
240 | if (attr != DEV_DMA_NOT_SUPPORTED) | |
241 | acpi_dma_configure(dev, attr); | |
242 | ||
243 | acpi_physnode_link_name(physical_node_name, node_id); | |
244 | retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, | |
245 | physical_node_name); | |
246 | if (retval) | |
247 | dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n", | |
248 | physical_node_name, retval); | |
249 | ||
250 | retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj, | |
251 | "firmware_node"); | |
252 | if (retval) | |
253 | dev_err(dev, "Failed to create link firmware_node (%d)\n", | |
254 | retval); | |
255 | ||
256 | mutex_unlock(&acpi_dev->physical_node_lock); | |
257 | ||
258 | if (acpi_dev->wakeup.flags.valid) | |
259 | device_set_wakeup_capable(dev, true); | |
260 | ||
261 | return 0; | |
262 | ||
263 | err: | |
264 | ACPI_COMPANION_SET(dev, NULL); | |
265 | put_device(dev); | |
266 | put_device(&acpi_dev->dev); | |
267 | return retval; | |
268 | } | |
269 | EXPORT_SYMBOL_GPL(acpi_bind_one); | |
270 | ||
271 | int acpi_unbind_one(struct device *dev) | |
272 | { | |
273 | struct acpi_device *acpi_dev = ACPI_COMPANION(dev); | |
274 | struct acpi_device_physical_node *entry; | |
275 | ||
276 | if (!acpi_dev) | |
277 | return 0; | |
278 | ||
279 | mutex_lock(&acpi_dev->physical_node_lock); | |
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"); | |
291 | ACPI_COMPANION_SET(dev, NULL); | |
292 | /* Drop references taken by acpi_bind_one(). */ | |
293 | put_device(dev); | |
294 | put_device(&acpi_dev->dev); | |
295 | kfree(entry); | |
296 | break; | |
297 | } | |
298 | ||
299 | mutex_unlock(&acpi_dev->physical_node_lock); | |
300 | return 0; | |
301 | } | |
302 | EXPORT_SYMBOL_GPL(acpi_unbind_one); | |
303 | ||
304 | static int acpi_platform_notify(struct device *dev) | |
305 | { | |
306 | struct acpi_bus_type *type = acpi_get_bus_type(dev); | |
307 | struct acpi_device *adev; | |
308 | int ret; | |
309 | ||
310 | ret = acpi_bind_one(dev, NULL); | |
311 | if (ret && type) { | |
312 | struct acpi_device *adev; | |
313 | ||
314 | adev = type->find_companion(dev); | |
315 | if (!adev) { | |
316 | DBG("Unable to get handle for %s\n", dev_name(dev)); | |
317 | ret = -ENODEV; | |
318 | goto out; | |
319 | } | |
320 | ret = acpi_bind_one(dev, adev); | |
321 | if (ret) | |
322 | goto out; | |
323 | } | |
324 | adev = ACPI_COMPANION(dev); | |
325 | if (!adev) | |
326 | goto out; | |
327 | ||
328 | if (dev->bus == &platform_bus_type) | |
329 | acpi_configure_pmsi_domain(dev); | |
330 | ||
331 | if (type && type->setup) | |
332 | type->setup(dev); | |
333 | else if (adev->handler && adev->handler->bind) | |
334 | adev->handler->bind(dev); | |
335 | ||
336 | out: | |
337 | #if ACPI_GLUE_DEBUG | |
338 | if (!ret) { | |
339 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
340 | ||
341 | acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer); | |
342 | DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer); | |
343 | kfree(buffer.pointer); | |
344 | } else | |
345 | DBG("Device %s -> No ACPI support\n", dev_name(dev)); | |
346 | #endif | |
347 | ||
348 | return ret; | |
349 | } | |
350 | ||
351 | static int acpi_platform_notify_remove(struct device *dev) | |
352 | { | |
353 | struct acpi_device *adev = ACPI_COMPANION(dev); | |
354 | struct acpi_bus_type *type; | |
355 | ||
356 | if (!adev) | |
357 | return 0; | |
358 | ||
359 | type = acpi_get_bus_type(dev); | |
360 | if (type && type->cleanup) | |
361 | type->cleanup(dev); | |
362 | else if (adev->handler && adev->handler->unbind) | |
363 | adev->handler->unbind(dev); | |
364 | ||
365 | acpi_unbind_one(dev); | |
366 | return 0; | |
367 | } | |
368 | ||
369 | void __init init_acpi_device_notify(void) | |
370 | { | |
371 | if (platform_notify || platform_notify_remove) { | |
372 | printk(KERN_ERR PREFIX "Can't use platform_notify\n"); | |
373 | return; | |
374 | } | |
375 | platform_notify = acpi_platform_notify; | |
376 | platform_notify_remove = acpi_platform_notify_remove; | |
377 | } |