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