2 * Link physical devices with ACPI devices support
4 * Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
5 * Copyright (c) 2005 Intel Corp.
7 * This file is released under the GPLv2.
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>
20 #define ACPI_GLUE_DEBUG 0
22 #define DBG(fmt, ...) \
23 printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__)
25 #define DBG(fmt, ...) \
28 printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__); \
31 static LIST_HEAD(bus_type_list
);
32 static DECLARE_RWSEM(bus_type_sem
);
34 #define PHYSICAL_NODE_STRING "physical_node"
35 #define PHYSICAL_NODE_NAME_SIZE (sizeof(PHYSICAL_NODE_STRING) + 10)
37 int register_acpi_bus_type(struct acpi_bus_type
*type
)
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
);
50 EXPORT_SYMBOL_GPL(register_acpi_bus_type
);
52 int unregister_acpi_bus_type(struct acpi_bus_type
*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",
66 EXPORT_SYMBOL_GPL(unregister_acpi_bus_type
);
68 static struct acpi_bus_type
*acpi_get_bus_type(struct device
*dev
)
70 struct acpi_bus_type
*tmp
, *ret
= NULL
;
72 down_read(&bus_type_sem
);
73 list_for_each_entry(tmp
, &bus_type_list
, list
) {
74 if (tmp
->match(dev
)) {
79 up_read(&bus_type_sem
);
83 #define FIND_CHILD_MIN_SCORE 1
84 #define FIND_CHILD_MAX_SCORE 2
86 static int find_child_checks(struct acpi_device
*adev
, bool check_children
)
88 bool sta_present
= true;
89 unsigned long long sta
;
92 status
= acpi_evaluate_integer(adev
->handle
, "_STA", NULL
, &sta
);
93 if (status
== AE_NOT_FOUND
)
95 else if (ACPI_FAILURE(status
) || !(sta
& ACPI_STA_DEVICE_ENABLED
))
98 if (check_children
&& list_empty(&adev
->children
))
101 return sta_present
? FIND_CHILD_MAX_SCORE
: FIND_CHILD_MIN_SCORE
;
104 struct acpi_device
*acpi_find_child_device(struct acpi_device
*parent
,
105 u64 address
, bool check_children
)
107 struct acpi_device
*adev
, *ret
= NULL
;
113 list_for_each_entry(adev
, &parent
->children
, node
) {
114 unsigned long long addr
;
118 status
= acpi_evaluate_integer(adev
->handle
, METHOD_NAME__ADR
,
120 if (ACPI_FAILURE(status
) || addr
!= address
)
124 /* This is the first matching object. Save it. */
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.
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
139 ret_score
= find_child_checks(ret
, check_children
);
140 if (ret_score
== FIND_CHILD_MAX_SCORE
)
143 score
= find_child_checks(adev
, check_children
);
144 if (score
== FIND_CHILD_MAX_SCORE
) {
146 } else if (score
> ret_score
) {
153 EXPORT_SYMBOL_GPL(acpi_find_child_device
);
155 static void acpi_physnode_link_name(char *buf
, unsigned int node_id
)
158 snprintf(buf
, PHYSICAL_NODE_NAME_SIZE
,
159 PHYSICAL_NODE_STRING
"%u", node_id
);
161 strcpy(buf
, PHYSICAL_NODE_STRING
);
164 int acpi_bind_one(struct device
*dev
, struct acpi_device
*acpi_dev
)
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
;
173 if (has_acpi_companion(dev
)) {
175 dev_warn(dev
, "ACPI companion already set\n");
178 acpi_dev
= ACPI_COMPANION(dev
);
184 get_device(&acpi_dev
->dev
);
186 physical_node
= kzalloc(sizeof(*physical_node
), GFP_KERNEL
);
187 if (!physical_node
) {
192 mutex_lock(&acpi_dev
->physical_node_lock
);
195 * Keep the list sorted by node_id so that the IDs of removed nodes can
196 * be recycled easily.
198 physnode_list
= &acpi_dev
->physical_node_list
;
200 list_for_each_entry(pn
, &acpi_dev
->physical_node_list
, node
) {
202 if (pn
->dev
== dev
) {
203 mutex_unlock(&acpi_dev
->physical_node_lock
);
205 dev_warn(dev
, "Already associated with ACPI node\n");
206 kfree(physical_node
);
207 if (ACPI_COMPANION(dev
) != acpi_dev
)
211 put_device(&acpi_dev
->dev
);
214 if (pn
->node_id
== node_id
) {
215 physnode_list
= &pn
->node
;
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
++;
225 if (!has_acpi_companion(dev
))
226 ACPI_COMPANION_SET(dev
, acpi_dev
);
228 if (acpi_check_dma(acpi_dev
, &coherent
))
229 arch_setup_dma_ops(dev
, 0, 0, NULL
, coherent
);
231 acpi_physnode_link_name(physical_node_name
, node_id
);
232 retval
= sysfs_create_link(&acpi_dev
->dev
.kobj
, &dev
->kobj
,
235 dev_err(&acpi_dev
->dev
, "Failed to create link %s (%d)\n",
236 physical_node_name
, retval
);
238 retval
= sysfs_create_link(&dev
->kobj
, &acpi_dev
->dev
.kobj
,
241 dev_err(dev
, "Failed to create link firmware_node (%d)\n",
244 mutex_unlock(&acpi_dev
->physical_node_lock
);
246 if (acpi_dev
->wakeup
.flags
.valid
)
247 device_set_wakeup_capable(dev
, true);
252 ACPI_COMPANION_SET(dev
, NULL
);
254 put_device(&acpi_dev
->dev
);
257 EXPORT_SYMBOL_GPL(acpi_bind_one
);
259 int acpi_unbind_one(struct device
*dev
)
261 struct acpi_device
*acpi_dev
= ACPI_COMPANION(dev
);
262 struct acpi_device_physical_node
*entry
;
267 mutex_lock(&acpi_dev
->physical_node_lock
);
269 list_for_each_entry(entry
, &acpi_dev
->physical_node_list
, node
)
270 if (entry
->dev
== dev
) {
271 char physnode_name
[PHYSICAL_NODE_NAME_SIZE
];
273 list_del(&entry
->node
);
274 acpi_dev
->physical_node_count
--;
276 acpi_physnode_link_name(physnode_name
, entry
->node_id
);
277 sysfs_remove_link(&acpi_dev
->dev
.kobj
, physnode_name
);
278 sysfs_remove_link(&dev
->kobj
, "firmware_node");
279 ACPI_COMPANION_SET(dev
, NULL
);
280 /* Drop references taken by acpi_bind_one(). */
282 put_device(&acpi_dev
->dev
);
287 mutex_unlock(&acpi_dev
->physical_node_lock
);
290 EXPORT_SYMBOL_GPL(acpi_unbind_one
);
292 static int acpi_platform_notify(struct device
*dev
)
294 struct acpi_bus_type
*type
= acpi_get_bus_type(dev
);
295 struct acpi_device
*adev
;
298 ret
= acpi_bind_one(dev
, NULL
);
300 struct acpi_device
*adev
;
302 adev
= type
->find_companion(dev
);
304 DBG("Unable to get handle for %s\n", dev_name(dev
));
308 ret
= acpi_bind_one(dev
, adev
);
312 adev
= ACPI_COMPANION(dev
);
316 if (type
&& type
->setup
)
318 else if (adev
->handler
&& adev
->handler
->bind
)
319 adev
->handler
->bind(dev
);
324 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
326 acpi_get_name(ACPI_HANDLE(dev
), ACPI_FULL_PATHNAME
, &buffer
);
327 DBG("Device %s -> %s\n", dev_name(dev
), (char *)buffer
.pointer
);
328 kfree(buffer
.pointer
);
330 DBG("Device %s -> No ACPI support\n", dev_name(dev
));
336 static int acpi_platform_notify_remove(struct device
*dev
)
338 struct acpi_device
*adev
= ACPI_COMPANION(dev
);
339 struct acpi_bus_type
*type
;
344 type
= acpi_get_bus_type(dev
);
345 if (type
&& type
->cleanup
)
347 else if (adev
->handler
&& adev
->handler
->unbind
)
348 adev
->handler
->unbind(dev
);
350 acpi_unbind_one(dev
);
354 int __init
init_acpi_device_notify(void)
356 if (platform_notify
|| platform_notify_remove
) {
357 printk(KERN_ERR PREFIX
"Can't use platform_notify\n");
360 platform_notify
= acpi_platform_notify
;
361 platform_notify_remove
= acpi_platform_notify_remove
;