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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
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, ...) \
29do { \
30 if (0) \
31 printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__); \
32} while (0)
33#endif
34static LIST_HEAD(bus_type_list);
35static 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
40int 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}
53EXPORT_SYMBOL_GPL(register_acpi_bus_type);
54
55int 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}
69EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
70
71static 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
89static 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
115struct 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}
164EXPORT_SYMBOL_GPL(acpi_find_child_device);
165
166static 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
175int 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
183 if (has_acpi_companion(dev)) {
184 if (acpi_dev) {
185 dev_warn(dev, "ACPI companion already set\n");
186 return -EINVAL;
187 } else {
188 acpi_dev = ACPI_COMPANION(dev);
189 }
190 }
191 if (!acpi_dev)
192 return -EINVAL;
193
194 get_device(&acpi_dev->dev);
195 get_device(dev);
196 physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
197 if (!physical_node) {
198 retval = -ENOMEM;
199 goto err;
200 }
201
202 mutex_lock(&acpi_dev->physical_node_lock);
203
204 /*
205 * Keep the list sorted by node_id so that the IDs of removed nodes can
206 * be recycled easily.
207 */
208 physnode_list = &acpi_dev->physical_node_list;
209 node_id = 0;
210 list_for_each_entry(pn, &acpi_dev->physical_node_list, node) {
211 /* Sanity check. */
212 if (pn->dev == dev) {
213 mutex_unlock(&acpi_dev->physical_node_lock);
214
215 dev_warn(dev, "Already associated with ACPI node\n");
216 kfree(physical_node);
217 if (ACPI_COMPANION(dev) != acpi_dev)
218 goto err;
219
220 put_device(dev);
221 put_device(&acpi_dev->dev);
222 return 0;
223 }
224 if (pn->node_id == node_id) {
225 physnode_list = &pn->node;
226 node_id++;
227 }
228 }
229
230 physical_node->node_id = node_id;
231 physical_node->dev = dev;
232 list_add(&physical_node->node, physnode_list);
233 acpi_dev->physical_node_count++;
234
235 if (!has_acpi_companion(dev))
236 ACPI_COMPANION_SET(dev, acpi_dev);
237
238 acpi_physnode_link_name(physical_node_name, node_id);
239 retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
240 physical_node_name);
241 if (retval)
242 dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n",
243 physical_node_name, retval);
244
245 retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
246 "firmware_node");
247 if (retval)
248 dev_err(dev, "Failed to create link firmware_node (%d)\n",
249 retval);
250
251 mutex_unlock(&acpi_dev->physical_node_lock);
252
253 if (acpi_dev->wakeup.flags.valid)
254 device_set_wakeup_capable(dev, true);
255
256 return 0;
257
258 err:
259 ACPI_COMPANION_SET(dev, NULL);
260 put_device(dev);
261 put_device(&acpi_dev->dev);
262 return retval;
263}
264EXPORT_SYMBOL_GPL(acpi_bind_one);
265
266int acpi_unbind_one(struct device *dev)
267{
268 struct acpi_device *acpi_dev = ACPI_COMPANION(dev);
269 struct acpi_device_physical_node *entry;
270
271 if (!acpi_dev)
272 return 0;
273
274 mutex_lock(&acpi_dev->physical_node_lock);
275
276 list_for_each_entry(entry, &acpi_dev->physical_node_list, node)
277 if (entry->dev == dev) {
278 char physnode_name[PHYSICAL_NODE_NAME_SIZE];
279
280 list_del(&entry->node);
281 acpi_dev->physical_node_count--;
282
283 acpi_physnode_link_name(physnode_name, entry->node_id);
284 sysfs_remove_link(&acpi_dev->dev.kobj, physnode_name);
285 sysfs_remove_link(&dev->kobj, "firmware_node");
286 ACPI_COMPANION_SET(dev, NULL);
287 /* Drop references taken by acpi_bind_one(). */
288 put_device(dev);
289 put_device(&acpi_dev->dev);
290 kfree(entry);
291 break;
292 }
293
294 mutex_unlock(&acpi_dev->physical_node_lock);
295 return 0;
296}
297EXPORT_SYMBOL_GPL(acpi_unbind_one);
298
299static int acpi_platform_notify(struct device *dev)
300{
301 struct acpi_bus_type *type = acpi_get_bus_type(dev);
302 struct acpi_device *adev;
303 int ret;
304
305 ret = acpi_bind_one(dev, NULL);
306 if (ret && type) {
307 struct acpi_device *adev;
308
309 adev = type->find_companion(dev);
310 if (!adev) {
311 DBG("Unable to get handle for %s\n", dev_name(dev));
312 ret = -ENODEV;
313 goto out;
314 }
315 ret = acpi_bind_one(dev, adev);
316 if (ret)
317 goto out;
318 }
319 adev = ACPI_COMPANION(dev);
320 if (!adev)
321 goto out;
322
323 if (dev->bus == &platform_bus_type)
324 acpi_configure_pmsi_domain(dev);
325
326 if (type && type->setup)
327 type->setup(dev);
328 else if (adev->handler && adev->handler->bind)
329 adev->handler->bind(dev);
330
331 out:
332#if ACPI_GLUE_DEBUG
333 if (!ret) {
334 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
335
336 acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
337 DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
338 kfree(buffer.pointer);
339 } else
340 DBG("Device %s -> No ACPI support\n", dev_name(dev));
341#endif
342
343 return ret;
344}
345
346static int acpi_platform_notify_remove(struct device *dev)
347{
348 struct acpi_device *adev = ACPI_COMPANION(dev);
349 struct acpi_bus_type *type;
350
351 if (!adev)
352 return 0;
353
354 type = acpi_get_bus_type(dev);
355 if (type && type->cleanup)
356 type->cleanup(dev);
357 else if (adev->handler && adev->handler->unbind)
358 adev->handler->unbind(dev);
359
360 acpi_unbind_one(dev);
361 return 0;
362}
363
364void __init init_acpi_device_notify(void)
365{
366 if (platform_notify || platform_notify_remove) {
367 printk(KERN_ERR PREFIX "Can't use platform_notify\n");
368 return;
369 }
370 platform_notify = acpi_platform_notify;
371 platform_notify_remove = acpi_platform_notify_remove;
372}