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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
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}