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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
17#include "internal.h"
18
19#define ACPI_GLUE_DEBUG 0
20#if ACPI_GLUE_DEBUG
21#define DBG(x...) printk(PREFIX x)
22#else
23#define DBG(x...) do { } while(0)
24#endif
25static LIST_HEAD(bus_type_list);
26static DECLARE_RWSEM(bus_type_sem);
27
28int register_acpi_bus_type(struct acpi_bus_type *type)
29{
30 if (acpi_disabled)
31 return -ENODEV;
32 if (type && type->bus && type->find_device) {
33 down_write(&bus_type_sem);
34 list_add_tail(&type->list, &bus_type_list);
35 up_write(&bus_type_sem);
36 printk(KERN_INFO PREFIX "bus type %s registered\n",
37 type->bus->name);
38 return 0;
39 }
40 return -ENODEV;
41}
42
43int unregister_acpi_bus_type(struct acpi_bus_type *type)
44{
45 if (acpi_disabled)
46 return 0;
47 if (type) {
48 down_write(&bus_type_sem);
49 list_del_init(&type->list);
50 up_write(&bus_type_sem);
51 printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
52 type->bus->name);
53 return 0;
54 }
55 return -ENODEV;
56}
57
58static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
59{
60 struct acpi_bus_type *tmp, *ret = NULL;
61
62 down_read(&bus_type_sem);
63 list_for_each_entry(tmp, &bus_type_list, list) {
64 if (tmp->bus == type) {
65 ret = tmp;
66 break;
67 }
68 }
69 up_read(&bus_type_sem);
70 return ret;
71}
72EXPORT_SYMBOL_GPL(register_acpi_bus_type);
73
74static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
75{
76 struct acpi_bus_type *tmp;
77 int ret = -ENODEV;
78
79 down_read(&bus_type_sem);
80 list_for_each_entry(tmp, &bus_type_list, list) {
81 if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
82 ret = 0;
83 break;
84 }
85 }
86 up_read(&bus_type_sem);
87 return ret;
88}
89EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
90
91/* Get device's handler per its address under its parent */
92struct acpi_find_child {
93 acpi_handle handle;
94 u64 address;
95};
96
97static acpi_status
98do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv)
99{
100 acpi_status status;
101 struct acpi_device_info *info;
102 struct acpi_find_child *find = context;
103
104 status = acpi_get_object_info(handle, &info);
105 if (ACPI_SUCCESS(status)) {
106 if ((info->address == find->address)
107 && (info->valid & ACPI_VALID_ADR))
108 find->handle = handle;
109 kfree(info);
110 }
111 return AE_OK;
112}
113
114acpi_handle acpi_get_child(acpi_handle parent, u64 address)
115{
116 struct acpi_find_child find = { NULL, address };
117
118 if (!parent)
119 return NULL;
120 acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
121 1, do_acpi_find_child, NULL, &find, NULL);
122 return find.handle;
123}
124
125EXPORT_SYMBOL(acpi_get_child);
126
127/* Link ACPI devices with physical devices */
128static void acpi_glue_data_handler(acpi_handle handle,
129 void *context)
130{
131 /* we provide an empty handler */
132}
133
134/* Note: a success call will increase reference count by one */
135struct device *acpi_get_physical_device(acpi_handle handle)
136{
137 acpi_status status;
138 struct device *dev;
139
140 status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
141 if (ACPI_SUCCESS(status))
142 return get_device(dev);
143 return NULL;
144}
145
146EXPORT_SYMBOL(acpi_get_physical_device);
147
148static int acpi_bind_one(struct device *dev, acpi_handle handle)
149{
150 struct acpi_device *acpi_dev;
151 acpi_status status;
152
153 if (dev->archdata.acpi_handle) {
154 dev_warn(dev, "Drivers changed 'acpi_handle'\n");
155 return -EINVAL;
156 }
157 get_device(dev);
158 status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
159 if (ACPI_FAILURE(status)) {
160 put_device(dev);
161 return -EINVAL;
162 }
163 dev->archdata.acpi_handle = handle;
164
165 status = acpi_bus_get_device(handle, &acpi_dev);
166 if (!ACPI_FAILURE(status)) {
167 int ret;
168
169 ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
170 "firmware_node");
171 ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
172 "physical_node");
173 if (acpi_dev->wakeup.flags.valid)
174 device_set_wakeup_capable(dev, true);
175 }
176
177 return 0;
178}
179
180static int acpi_unbind_one(struct device *dev)
181{
182 if (!dev->archdata.acpi_handle)
183 return 0;
184 if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) {
185 struct acpi_device *acpi_dev;
186
187 /* acpi_get_physical_device increase refcnt by one */
188 put_device(dev);
189
190 if (!acpi_bus_get_device(dev->archdata.acpi_handle,
191 &acpi_dev)) {
192 sysfs_remove_link(&dev->kobj, "firmware_node");
193 sysfs_remove_link(&acpi_dev->dev.kobj, "physical_node");
194 }
195
196 acpi_detach_data(dev->archdata.acpi_handle,
197 acpi_glue_data_handler);
198 dev->archdata.acpi_handle = NULL;
199 /* acpi_bind_one increase refcnt by one */
200 put_device(dev);
201 } else {
202 dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
203 }
204 return 0;
205}
206
207static int acpi_platform_notify(struct device *dev)
208{
209 struct acpi_bus_type *type;
210 acpi_handle handle;
211 int ret = -EINVAL;
212
213 if (!dev->bus || !dev->parent) {
214 /* bridge devices genernally haven't bus or parent */
215 ret = acpi_find_bridge_device(dev, &handle);
216 goto end;
217 }
218 type = acpi_get_bus_type(dev->bus);
219 if (!type) {
220 DBG("No ACPI bus support for %s\n", dev_name(dev));
221 ret = -EINVAL;
222 goto end;
223 }
224 if ((ret = type->find_device(dev, &handle)) != 0)
225 DBG("Can't get handler for %s\n", dev_name(dev));
226 end:
227 if (!ret)
228 acpi_bind_one(dev, handle);
229
230#if ACPI_GLUE_DEBUG
231 if (!ret) {
232 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
233
234 acpi_get_name(dev->archdata.acpi_handle,
235 ACPI_FULL_PATHNAME, &buffer);
236 DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
237 kfree(buffer.pointer);
238 } else
239 DBG("Device %s -> No ACPI support\n", dev_name(dev));
240#endif
241
242 return ret;
243}
244
245static int acpi_platform_notify_remove(struct device *dev)
246{
247 acpi_unbind_one(dev);
248 return 0;
249}
250
251int __init init_acpi_device_notify(void)
252{
253 if (platform_notify || platform_notify_remove) {
254 printk(KERN_ERR PREFIX "Can't use platform_notify\n");
255 return 0;
256 }
257 platform_notify = acpi_platform_notify;
258 platform_notify_remove = acpi_platform_notify_remove;
259 return 0;
260}
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}