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(x...) printk(PREFIX x)
23 #define DBG(x...) do { } while(0)
25 static LIST_HEAD(bus_type_list);
26 static DECLARE_RWSEM(bus_type_sem);
28 int register_acpi_bus_type(struct acpi_bus_type *type)
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",
43 int unregister_acpi_bus_type(struct acpi_bus_type *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",
58 static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
60 struct acpi_bus_type *tmp, *ret = NULL;
62 down_read(&bus_type_sem);
63 list_for_each_entry(tmp, &bus_type_list, list) {
64 if (tmp->bus == type) {
69 up_read(&bus_type_sem);
72 EXPORT_SYMBOL_GPL(register_acpi_bus_type);
74 static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
76 struct acpi_bus_type *tmp;
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)) {
86 up_read(&bus_type_sem);
89 EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
91 /* Get device's handler per its address under its parent */
92 struct acpi_find_child {
98 do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv)
101 struct acpi_device_info *info;
102 struct acpi_find_child *find = context;
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;
114 acpi_handle acpi_get_child(acpi_handle parent, u64 address)
116 struct acpi_find_child find = { NULL, address };
120 acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
121 1, do_acpi_find_child, NULL, &find, NULL);
125 EXPORT_SYMBOL(acpi_get_child);
127 /* Link ACPI devices with physical devices */
128 static void acpi_glue_data_handler(acpi_handle handle,
131 /* we provide an empty handler */
134 /* Note: a success call will increase reference count by one */
135 struct device *acpi_get_physical_device(acpi_handle handle)
140 status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
141 if (ACPI_SUCCESS(status))
142 return get_device(dev);
146 EXPORT_SYMBOL(acpi_get_physical_device);
148 static int acpi_bind_one(struct device *dev, acpi_handle handle)
150 struct acpi_device *acpi_dev;
153 if (dev->archdata.acpi_handle) {
154 dev_warn(dev, "Drivers changed 'acpi_handle'\n");
158 status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
159 if (ACPI_FAILURE(status)) {
163 dev->archdata.acpi_handle = handle;
165 status = acpi_bus_get_device(handle, &acpi_dev);
166 if (!ACPI_FAILURE(status)) {
169 ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
171 ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
173 if (acpi_dev->wakeup.flags.valid)
174 device_set_wakeup_capable(dev, true);
180 static int acpi_unbind_one(struct device *dev)
182 if (!dev->archdata.acpi_handle)
184 if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) {
185 struct acpi_device *acpi_dev;
187 /* acpi_get_physical_device increase refcnt by one */
190 if (!acpi_bus_get_device(dev->archdata.acpi_handle,
192 sysfs_remove_link(&dev->kobj, "firmware_node");
193 sysfs_remove_link(&acpi_dev->dev.kobj, "physical_node");
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 */
202 dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
207 static int acpi_platform_notify(struct device *dev)
209 struct acpi_bus_type *type;
213 if (!dev->bus || !dev->parent) {
214 /* bridge devices genernally haven't bus or parent */
215 ret = acpi_find_bridge_device(dev, &handle);
218 type = acpi_get_bus_type(dev->bus);
220 DBG("No ACPI bus support for %s\n", dev_name(dev));
224 if ((ret = type->find_device(dev, &handle)) != 0)
225 DBG("Can't get handler for %s\n", dev_name(dev));
228 acpi_bind_one(dev, handle);
232 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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);
239 DBG("Device %s -> No ACPI support\n", dev_name(dev));
245 static int acpi_platform_notify_remove(struct device *dev)
247 acpi_unbind_one(dev);
251 int __init init_acpi_device_notify(void)
253 if (platform_notify || platform_notify_remove) {
254 printk(KERN_ERR PREFIX "Can't use platform_notify\n");
257 platform_notify = acpi_platform_notify;
258 platform_notify_remove = acpi_platform_notify_remove;