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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#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 /*
102 * If the device has a _HID returning a valid ACPI/PNP device ID, it is
103 * better to make it look less attractive here, so that the other device
104 * with the same _ADR value (that may not have a valid device ID) can be
105 * matched going forward. [This means a second spec violation in a row,
106 * so whatever we do here is best effort anyway.]
107 */
108 return sta_present && !adev->pnp.type.platform_id ?
109 FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE;
110}
111
112struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
113 u64 address, bool check_children)
114{
115 struct acpi_device *adev, *ret = NULL;
116 int ret_score = 0;
117
118 if (!parent)
119 return NULL;
120
121 list_for_each_entry(adev, &parent->children, node) {
122 unsigned long long addr;
123 acpi_status status;
124 int score;
125
126 status = acpi_evaluate_integer(adev->handle, METHOD_NAME__ADR,
127 NULL, &addr);
128 if (ACPI_FAILURE(status) || addr != address)
129 continue;
130
131 if (!ret) {
132 /* This is the first matching object. Save it. */
133 ret = adev;
134 continue;
135 }
136 /*
137 * There is more than one matching device object with the same
138 * _ADR value. That really is unexpected, so we are kind of
139 * beyond the scope of the spec here. We have to choose which
140 * one to return, though.
141 *
142 * First, check if the previously found object is good enough
143 * and return it if so. Second, do the same for the object that
144 * we've just found.
145 */
146 if (!ret_score) {
147 ret_score = find_child_checks(ret, check_children);
148 if (ret_score == FIND_CHILD_MAX_SCORE)
149 return ret;
150 }
151 score = find_child_checks(adev, check_children);
152 if (score == FIND_CHILD_MAX_SCORE) {
153 return adev;
154 } else if (score > ret_score) {
155 ret = adev;
156 ret_score = score;
157 }
158 }
159 return ret;
160}
161EXPORT_SYMBOL_GPL(acpi_find_child_device);
162
163static void acpi_physnode_link_name(char *buf, unsigned int node_id)
164{
165 if (node_id > 0)
166 snprintf(buf, PHYSICAL_NODE_NAME_SIZE,
167 PHYSICAL_NODE_STRING "%u", node_id);
168 else
169 strcpy(buf, PHYSICAL_NODE_STRING);
170}
171
172int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
173{
174 struct acpi_device_physical_node *physical_node, *pn;
175 char physical_node_name[PHYSICAL_NODE_NAME_SIZE];
176 struct list_head *physnode_list;
177 unsigned int node_id;
178 int retval = -EINVAL;
179 enum dev_dma_attr attr;
180
181 if (has_acpi_companion(dev)) {
182 if (acpi_dev) {
183 dev_warn(dev, "ACPI companion already set\n");
184 return -EINVAL;
185 } else {
186 acpi_dev = ACPI_COMPANION(dev);
187 }
188 }
189 if (!acpi_dev)
190 return -EINVAL;
191
192 get_device(&acpi_dev->dev);
193 get_device(dev);
194 physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
195 if (!physical_node) {
196 retval = -ENOMEM;
197 goto err;
198 }
199
200 mutex_lock(&acpi_dev->physical_node_lock);
201
202 /*
203 * Keep the list sorted by node_id so that the IDs of removed nodes can
204 * be recycled easily.
205 */
206 physnode_list = &acpi_dev->physical_node_list;
207 node_id = 0;
208 list_for_each_entry(pn, &acpi_dev->physical_node_list, node) {
209 /* Sanity check. */
210 if (pn->dev == dev) {
211 mutex_unlock(&acpi_dev->physical_node_lock);
212
213 dev_warn(dev, "Already associated with ACPI node\n");
214 kfree(physical_node);
215 if (ACPI_COMPANION(dev) != acpi_dev)
216 goto err;
217
218 put_device(dev);
219 put_device(&acpi_dev->dev);
220 return 0;
221 }
222 if (pn->node_id == node_id) {
223 physnode_list = &pn->node;
224 node_id++;
225 }
226 }
227
228 physical_node->node_id = node_id;
229 physical_node->dev = dev;
230 list_add(&physical_node->node, physnode_list);
231 acpi_dev->physical_node_count++;
232
233 if (!has_acpi_companion(dev))
234 ACPI_COMPANION_SET(dev, acpi_dev);
235
236 attr = acpi_get_dma_attr(acpi_dev);
237 if (attr != DEV_DMA_NOT_SUPPORTED)
238 acpi_dma_configure(dev, attr);
239
240 acpi_physnode_link_name(physical_node_name, node_id);
241 retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
242 physical_node_name);
243 if (retval)
244 dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n",
245 physical_node_name, retval);
246
247 retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
248 "firmware_node");
249 if (retval)
250 dev_err(dev, "Failed to create link firmware_node (%d)\n",
251 retval);
252
253 mutex_unlock(&acpi_dev->physical_node_lock);
254
255 if (acpi_dev->wakeup.flags.valid)
256 device_set_wakeup_capable(dev, true);
257
258 return 0;
259
260 err:
261 ACPI_COMPANION_SET(dev, NULL);
262 put_device(dev);
263 put_device(&acpi_dev->dev);
264 return retval;
265}
266EXPORT_SYMBOL_GPL(acpi_bind_one);
267
268int acpi_unbind_one(struct device *dev)
269{
270 struct acpi_device *acpi_dev = ACPI_COMPANION(dev);
271 struct acpi_device_physical_node *entry;
272
273 if (!acpi_dev)
274 return 0;
275
276 mutex_lock(&acpi_dev->physical_node_lock);
277
278 list_for_each_entry(entry, &acpi_dev->physical_node_list, node)
279 if (entry->dev == dev) {
280 char physnode_name[PHYSICAL_NODE_NAME_SIZE];
281
282 list_del(&entry->node);
283 acpi_dev->physical_node_count--;
284
285 acpi_physnode_link_name(physnode_name, entry->node_id);
286 sysfs_remove_link(&acpi_dev->dev.kobj, physnode_name);
287 sysfs_remove_link(&dev->kobj, "firmware_node");
288 ACPI_COMPANION_SET(dev, NULL);
289 /* Drop references taken by acpi_bind_one(). */
290 put_device(dev);
291 put_device(&acpi_dev->dev);
292 kfree(entry);
293 break;
294 }
295
296 mutex_unlock(&acpi_dev->physical_node_lock);
297 return 0;
298}
299EXPORT_SYMBOL_GPL(acpi_unbind_one);
300
301static int acpi_platform_notify(struct device *dev)
302{
303 struct acpi_bus_type *type = acpi_get_bus_type(dev);
304 struct acpi_device *adev;
305 int ret;
306
307 ret = acpi_bind_one(dev, NULL);
308 if (ret && type) {
309 struct acpi_device *adev;
310
311 adev = type->find_companion(dev);
312 if (!adev) {
313 DBG("Unable to get handle for %s\n", dev_name(dev));
314 ret = -ENODEV;
315 goto out;
316 }
317 ret = acpi_bind_one(dev, adev);
318 if (ret)
319 goto out;
320 }
321 adev = ACPI_COMPANION(dev);
322 if (!adev)
323 goto out;
324
325 if (type && type->setup)
326 type->setup(dev);
327 else if (adev->handler && adev->handler->bind)
328 adev->handler->bind(dev);
329
330 out:
331#if ACPI_GLUE_DEBUG
332 if (!ret) {
333 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
334
335 acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
336 DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
337 kfree(buffer.pointer);
338 } else
339 DBG("Device %s -> No ACPI support\n", dev_name(dev));
340#endif
341
342 return ret;
343}
344
345static int acpi_platform_notify_remove(struct device *dev)
346{
347 struct acpi_device *adev = ACPI_COMPANION(dev);
348 struct acpi_bus_type *type;
349
350 if (!adev)
351 return 0;
352
353 type = acpi_get_bus_type(dev);
354 if (type && type->cleanup)
355 type->cleanup(dev);
356 else if (adev->handler && adev->handler->unbind)
357 adev->handler->unbind(dev);
358
359 acpi_unbind_one(dev);
360 return 0;
361}
362
363void __init init_acpi_device_notify(void)
364{
365 if (platform_notify || platform_notify_remove) {
366 printk(KERN_ERR PREFIX "Can't use platform_notify\n");
367 return;
368 }
369 platform_notify = acpi_platform_notify;
370 platform_notify_remove = acpi_platform_notify_remove;
371}