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>
19 #define ACPI_GLUE_DEBUG 0
21 #define DBG(fmt, ...) \
22 printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__)
24 #define DBG(fmt, ...) \
27 printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__); \
30 static LIST_HEAD(bus_type_list
);
31 static DECLARE_RWSEM(bus_type_sem
);
33 #define PHYSICAL_NODE_STRING "physical_node"
35 int register_acpi_bus_type(struct acpi_bus_type
*type
)
39 if (type
&& type
->bus
&& type
->find_device
) {
40 down_write(&bus_type_sem
);
41 list_add_tail(&type
->list
, &bus_type_list
);
42 up_write(&bus_type_sem
);
43 printk(KERN_INFO PREFIX
"bus type %s registered\n",
49 EXPORT_SYMBOL_GPL(register_acpi_bus_type
);
51 int unregister_acpi_bus_type(struct acpi_bus_type
*type
)
56 down_write(&bus_type_sem
);
57 list_del_init(&type
->list
);
58 up_write(&bus_type_sem
);
59 printk(KERN_INFO PREFIX
"ACPI bus type %s unregistered\n",
65 EXPORT_SYMBOL_GPL(unregister_acpi_bus_type
);
67 static struct acpi_bus_type
*acpi_get_bus_type(struct bus_type
*type
)
69 struct acpi_bus_type
*tmp
, *ret
= NULL
;
71 down_read(&bus_type_sem
);
72 list_for_each_entry(tmp
, &bus_type_list
, list
) {
73 if (tmp
->bus
== type
) {
78 up_read(&bus_type_sem
);
82 static int acpi_find_bridge_device(struct device
*dev
, acpi_handle
* handle
)
84 struct acpi_bus_type
*tmp
;
87 down_read(&bus_type_sem
);
88 list_for_each_entry(tmp
, &bus_type_list
, list
) {
89 if (tmp
->find_bridge
&& !tmp
->find_bridge(dev
, handle
)) {
94 up_read(&bus_type_sem
);
98 /* Get device's handler per its address under its parent */
99 struct acpi_find_child
{
105 do_acpi_find_child(acpi_handle handle
, u32 lvl
, void *context
, void **rv
)
108 struct acpi_device_info
*info
;
109 struct acpi_find_child
*find
= context
;
111 status
= acpi_get_object_info(handle
, &info
);
112 if (ACPI_SUCCESS(status
)) {
113 if ((info
->address
== find
->address
)
114 && (info
->valid
& ACPI_VALID_ADR
))
115 find
->handle
= handle
;
121 acpi_handle
acpi_get_child(acpi_handle parent
, u64 address
)
123 struct acpi_find_child find
= { NULL
, address
};
127 acpi_walk_namespace(ACPI_TYPE_DEVICE
, parent
,
128 1, do_acpi_find_child
, NULL
, &find
, NULL
);
132 EXPORT_SYMBOL(acpi_get_child
);
134 static int acpi_bind_one(struct device
*dev
, acpi_handle handle
)
136 struct acpi_device
*acpi_dev
;
138 struct acpi_device_physical_node
*physical_node
, *pn
;
139 char physical_node_name
[sizeof(PHYSICAL_NODE_STRING
) + 2];
140 int retval
= -EINVAL
;
142 if (ACPI_HANDLE(dev
)) {
144 dev_warn(dev
, "ACPI handle is already set\n");
147 handle
= ACPI_HANDLE(dev
);
154 status
= acpi_bus_get_device(handle
, &acpi_dev
);
155 if (ACPI_FAILURE(status
))
158 physical_node
= kzalloc(sizeof(*physical_node
), GFP_KERNEL
);
159 if (!physical_node
) {
164 mutex_lock(&acpi_dev
->physical_node_lock
);
167 list_for_each_entry(pn
, &acpi_dev
->physical_node_list
, node
)
168 if (pn
->dev
== dev
) {
169 dev_warn(dev
, "Already associated with ACPI node\n");
173 /* allocate physical node id according to physical_node_id_bitmap */
174 physical_node
->node_id
=
175 find_first_zero_bit(acpi_dev
->physical_node_id_bitmap
,
176 ACPI_MAX_PHYSICAL_NODE
);
177 if (physical_node
->node_id
>= ACPI_MAX_PHYSICAL_NODE
) {
182 set_bit(physical_node
->node_id
, acpi_dev
->physical_node_id_bitmap
);
183 physical_node
->dev
= dev
;
184 list_add_tail(&physical_node
->node
, &acpi_dev
->physical_node_list
);
185 acpi_dev
->physical_node_count
++;
187 mutex_unlock(&acpi_dev
->physical_node_lock
);
189 if (!ACPI_HANDLE(dev
))
190 ACPI_HANDLE_SET(dev
, acpi_dev
->handle
);
192 if (!physical_node
->node_id
)
193 strcpy(physical_node_name
, PHYSICAL_NODE_STRING
);
195 sprintf(physical_node_name
,
196 "physical_node%d", physical_node
->node_id
);
197 retval
= sysfs_create_link(&acpi_dev
->dev
.kobj
, &dev
->kobj
,
199 retval
= sysfs_create_link(&dev
->kobj
, &acpi_dev
->dev
.kobj
,
202 if (acpi_dev
->wakeup
.flags
.valid
)
203 device_set_wakeup_capable(dev
, true);
208 ACPI_HANDLE_SET(dev
, NULL
);
213 mutex_unlock(&acpi_dev
->physical_node_lock
);
214 kfree(physical_node
);
218 static int acpi_unbind_one(struct device
*dev
)
220 struct acpi_device_physical_node
*entry
;
221 struct acpi_device
*acpi_dev
;
223 struct list_head
*node
, *next
;
225 if (!ACPI_HANDLE(dev
))
228 status
= acpi_bus_get_device(ACPI_HANDLE(dev
), &acpi_dev
);
229 if (ACPI_FAILURE(status
))
232 mutex_lock(&acpi_dev
->physical_node_lock
);
233 list_for_each_safe(node
, next
, &acpi_dev
->physical_node_list
) {
234 char physical_node_name
[sizeof(PHYSICAL_NODE_STRING
) + 2];
236 entry
= list_entry(node
, struct acpi_device_physical_node
,
238 if (entry
->dev
!= dev
)
242 clear_bit(entry
->node_id
, acpi_dev
->physical_node_id_bitmap
);
244 acpi_dev
->physical_node_count
--;
247 strcpy(physical_node_name
, PHYSICAL_NODE_STRING
);
249 sprintf(physical_node_name
,
250 "physical_node%d", entry
->node_id
);
252 sysfs_remove_link(&acpi_dev
->dev
.kobj
, physical_node_name
);
253 sysfs_remove_link(&dev
->kobj
, "firmware_node");
254 ACPI_HANDLE_SET(dev
, NULL
);
255 /* acpi_bind_one increase refcnt by one */
259 mutex_unlock(&acpi_dev
->physical_node_lock
);
264 dev_err(dev
, "Oops, 'acpi_handle' corrupt\n");
268 static int acpi_platform_notify(struct device
*dev
)
270 struct acpi_bus_type
*type
;
274 ret
= acpi_bind_one(dev
, NULL
);
278 if (!dev
->bus
|| !dev
->parent
) {
279 /* bridge devices genernally haven't bus or parent */
280 ret
= acpi_find_bridge_device(dev
, &handle
);
283 type
= acpi_get_bus_type(dev
->bus
);
285 DBG("No ACPI bus support for %s\n", dev_name(dev
));
289 if ((ret
= type
->find_device(dev
, &handle
)) != 0)
290 DBG("Can't get handler for %s\n", dev_name(dev
));
293 acpi_bind_one(dev
, handle
);
298 struct acpi_buffer buffer
= { ACPI_ALLOCATE_BUFFER
, NULL
};
300 acpi_get_name(ACPI_HANDLE(dev
), ACPI_FULL_PATHNAME
, &buffer
);
301 DBG("Device %s -> %s\n", dev_name(dev
), (char *)buffer
.pointer
);
302 kfree(buffer
.pointer
);
304 DBG("Device %s -> No ACPI support\n", dev_name(dev
));
310 static int acpi_platform_notify_remove(struct device
*dev
)
312 acpi_unbind_one(dev
);
316 int __init
init_acpi_device_notify(void)
318 if (platform_notify
|| platform_notify_remove
) {
319 printk(KERN_ERR PREFIX
"Can't use platform_notify\n");
322 platform_notify
= acpi_platform_notify
;
323 platform_notify_remove
= acpi_platform_notify_remove
;