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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/init.h>
10#include <linux/list.h>
11#include <linux/device.h>
12#include <linux/slab.h>
13#include <linux/rwsem.h>
14#include <linux/acpi.h>
15
16#include "internal.h"
17
18#define ACPI_GLUE_DEBUG 0
19#if ACPI_GLUE_DEBUG
20#define DBG(x...) printk(PREFIX x)
21#else
22#define DBG(x...) do { } while(0)
23#endif
24static LIST_HEAD(bus_type_list);
25static DECLARE_RWSEM(bus_type_sem);
26
27int register_acpi_bus_type(struct acpi_bus_type *type)
28{
29 if (acpi_disabled)
30 return -ENODEV;
31 if (type && type->bus && type->find_device) {
32 down_write(&bus_type_sem);
33 list_add_tail(&type->list, &bus_type_list);
34 up_write(&bus_type_sem);
35 printk(KERN_INFO PREFIX "bus type %s registered\n",
36 type->bus->name);
37 return 0;
38 }
39 return -ENODEV;
40}
41
42int unregister_acpi_bus_type(struct acpi_bus_type *type)
43{
44 if (acpi_disabled)
45 return 0;
46 if (type) {
47 down_write(&bus_type_sem);
48 list_del_init(&type->list);
49 up_write(&bus_type_sem);
50 printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
51 type->bus->name);
52 return 0;
53 }
54 return -ENODEV;
55}
56
57static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
58{
59 struct acpi_bus_type *tmp, *ret = NULL;
60
61 down_read(&bus_type_sem);
62 list_for_each_entry(tmp, &bus_type_list, list) {
63 if (tmp->bus == type) {
64 ret = tmp;
65 break;
66 }
67 }
68 up_read(&bus_type_sem);
69 return ret;
70}
71
72static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
73{
74 struct acpi_bus_type *tmp;
75 int ret = -ENODEV;
76
77 down_read(&bus_type_sem);
78 list_for_each_entry(tmp, &bus_type_list, list) {
79 if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
80 ret = 0;
81 break;
82 }
83 }
84 up_read(&bus_type_sem);
85 return ret;
86}
87
88/* Get device's handler per its address under its parent */
89struct acpi_find_child {
90 acpi_handle handle;
91 u64 address;
92};
93
94static acpi_status
95do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv)
96{
97 acpi_status status;
98 struct acpi_device_info *info;
99 struct acpi_find_child *find = context;
100
101 status = acpi_get_object_info(handle, &info);
102 if (ACPI_SUCCESS(status)) {
103 if ((info->address == find->address)
104 && (info->valid & ACPI_VALID_ADR))
105 find->handle = handle;
106 kfree(info);
107 }
108 return AE_OK;
109}
110
111acpi_handle acpi_get_child(acpi_handle parent, u64 address)
112{
113 struct acpi_find_child find = { NULL, address };
114
115 if (!parent)
116 return NULL;
117 acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
118 1, do_acpi_find_child, NULL, &find, NULL);
119 return find.handle;
120}
121
122EXPORT_SYMBOL(acpi_get_child);
123
124/* Link ACPI devices with physical devices */
125static void acpi_glue_data_handler(acpi_handle handle,
126 void *context)
127{
128 /* we provide an empty handler */
129}
130
131/* Note: a success call will increase reference count by one */
132struct device *acpi_get_physical_device(acpi_handle handle)
133{
134 acpi_status status;
135 struct device *dev;
136
137 status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
138 if (ACPI_SUCCESS(status))
139 return get_device(dev);
140 return NULL;
141}
142
143EXPORT_SYMBOL(acpi_get_physical_device);
144
145static int acpi_bind_one(struct device *dev, acpi_handle handle)
146{
147 struct acpi_device *acpi_dev;
148 acpi_status status;
149
150 if (dev->archdata.acpi_handle) {
151 dev_warn(dev, "Drivers changed 'acpi_handle'\n");
152 return -EINVAL;
153 }
154 get_device(dev);
155 status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
156 if (ACPI_FAILURE(status)) {
157 put_device(dev);
158 return -EINVAL;
159 }
160 dev->archdata.acpi_handle = handle;
161
162 status = acpi_bus_get_device(handle, &acpi_dev);
163 if (!ACPI_FAILURE(status)) {
164 int ret;
165
166 ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
167 "firmware_node");
168 ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
169 "physical_node");
170 if (acpi_dev->wakeup.flags.valid)
171 device_set_wakeup_capable(dev, true);
172 }
173
174 return 0;
175}
176
177static int acpi_unbind_one(struct device *dev)
178{
179 if (!dev->archdata.acpi_handle)
180 return 0;
181 if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) {
182 struct acpi_device *acpi_dev;
183
184 /* acpi_get_physical_device increase refcnt by one */
185 put_device(dev);
186
187 if (!acpi_bus_get_device(dev->archdata.acpi_handle,
188 &acpi_dev)) {
189 sysfs_remove_link(&dev->kobj, "firmware_node");
190 sysfs_remove_link(&acpi_dev->dev.kobj, "physical_node");
191 }
192
193 acpi_detach_data(dev->archdata.acpi_handle,
194 acpi_glue_data_handler);
195 dev->archdata.acpi_handle = NULL;
196 /* acpi_bind_one increase refcnt by one */
197 put_device(dev);
198 } else {
199 dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
200 }
201 return 0;
202}
203
204static int acpi_platform_notify(struct device *dev)
205{
206 struct acpi_bus_type *type;
207 acpi_handle handle;
208 int ret = -EINVAL;
209
210 if (!dev->bus || !dev->parent) {
211 /* bridge devices genernally haven't bus or parent */
212 ret = acpi_find_bridge_device(dev, &handle);
213 goto end;
214 }
215 type = acpi_get_bus_type(dev->bus);
216 if (!type) {
217 DBG("No ACPI bus support for %s\n", dev_name(dev));
218 ret = -EINVAL;
219 goto end;
220 }
221 if ((ret = type->find_device(dev, &handle)) != 0)
222 DBG("Can't get handler for %s\n", dev_name(dev));
223 end:
224 if (!ret)
225 acpi_bind_one(dev, handle);
226
227#if ACPI_GLUE_DEBUG
228 if (!ret) {
229 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
230
231 acpi_get_name(dev->archdata.acpi_handle,
232 ACPI_FULL_PATHNAME, &buffer);
233 DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
234 kfree(buffer.pointer);
235 } else
236 DBG("Device %s -> No ACPI support\n", dev_name(dev));
237#endif
238
239 return ret;
240}
241
242static int acpi_platform_notify_remove(struct device *dev)
243{
244 acpi_unbind_one(dev);
245 return 0;
246}
247
248int __init init_acpi_device_notify(void)
249{
250 if (platform_notify || platform_notify_remove) {
251 printk(KERN_ERR PREFIX "Can't use platform_notify\n");
252 return 0;
253 }
254 platform_notify = acpi_platform_notify;
255 platform_notify_remove = acpi_platform_notify_remove;
256 return 0;
257}
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}