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->match && 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", type->name);
48 EXPORT_SYMBOL_GPL(register_acpi_bus_type);
50 int unregister_acpi_bus_type(struct acpi_bus_type *type)
55 down_write(&bus_type_sem);
56 list_del_init(&type->list);
57 up_write(&bus_type_sem);
58 printk(KERN_INFO PREFIX "bus type %s unregistered\n",
64 EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
66 static struct acpi_bus_type *acpi_get_bus_type(struct device *dev)
68 struct acpi_bus_type *tmp, *ret = NULL;
70 down_read(&bus_type_sem);
71 list_for_each_entry(tmp, &bus_type_list, list) {
72 if (tmp->match(dev)) {
77 up_read(&bus_type_sem);
81 static acpi_status do_acpi_find_child(acpi_handle handle, u32 lvl_not_used,
82 void *addr_p, void **ret_p)
84 unsigned long long addr, sta;
87 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &addr);
88 if (ACPI_SUCCESS(status) && addr == *((u64 *)addr_p)) {
90 status = acpi_bus_get_status_handle(handle, &sta);
91 if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_ENABLED))
92 return AE_CTRL_TERMINATE;
97 acpi_handle acpi_get_child(acpi_handle parent, u64 address)
104 acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, 1, NULL,
105 do_acpi_find_child, &address, &ret);
106 return (acpi_handle)ret;
108 EXPORT_SYMBOL(acpi_get_child);
110 int acpi_bind_one(struct device *dev, acpi_handle handle)
112 struct acpi_device *acpi_dev;
114 struct acpi_device_physical_node *physical_node, *pn;
115 char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2];
116 int retval = -EINVAL;
118 if (ACPI_HANDLE(dev)) {
120 dev_warn(dev, "ACPI handle is already set\n");
123 handle = ACPI_HANDLE(dev);
130 status = acpi_bus_get_device(handle, &acpi_dev);
131 if (ACPI_FAILURE(status))
134 physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
135 if (!physical_node) {
140 mutex_lock(&acpi_dev->physical_node_lock);
143 list_for_each_entry(pn, &acpi_dev->physical_node_list, node)
144 if (pn->dev == dev) {
145 dev_warn(dev, "Already associated with ACPI node\n");
149 /* allocate physical node id according to physical_node_id_bitmap */
150 physical_node->node_id =
151 find_first_zero_bit(acpi_dev->physical_node_id_bitmap,
152 ACPI_MAX_PHYSICAL_NODE);
153 if (physical_node->node_id >= ACPI_MAX_PHYSICAL_NODE) {
158 set_bit(physical_node->node_id, acpi_dev->physical_node_id_bitmap);
159 physical_node->dev = dev;
160 list_add_tail(&physical_node->node, &acpi_dev->physical_node_list);
161 acpi_dev->physical_node_count++;
163 mutex_unlock(&acpi_dev->physical_node_lock);
165 if (!ACPI_HANDLE(dev))
166 ACPI_HANDLE_SET(dev, acpi_dev->handle);
168 if (!physical_node->node_id)
169 strcpy(physical_node_name, PHYSICAL_NODE_STRING);
171 sprintf(physical_node_name,
172 "physical_node%d", physical_node->node_id);
173 retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
175 retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
178 if (acpi_dev->wakeup.flags.valid)
179 device_set_wakeup_capable(dev, true);
184 ACPI_HANDLE_SET(dev, NULL);
189 mutex_unlock(&acpi_dev->physical_node_lock);
190 kfree(physical_node);
193 EXPORT_SYMBOL_GPL(acpi_bind_one);
195 int acpi_unbind_one(struct device *dev)
197 struct acpi_device_physical_node *entry;
198 struct acpi_device *acpi_dev;
200 struct list_head *node, *next;
202 if (!ACPI_HANDLE(dev))
205 status = acpi_bus_get_device(ACPI_HANDLE(dev), &acpi_dev);
206 if (ACPI_FAILURE(status))
209 mutex_lock(&acpi_dev->physical_node_lock);
210 list_for_each_safe(node, next, &acpi_dev->physical_node_list) {
211 char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2];
213 entry = list_entry(node, struct acpi_device_physical_node,
215 if (entry->dev != dev)
219 clear_bit(entry->node_id, acpi_dev->physical_node_id_bitmap);
221 acpi_dev->physical_node_count--;
224 strcpy(physical_node_name, PHYSICAL_NODE_STRING);
226 sprintf(physical_node_name,
227 "physical_node%d", entry->node_id);
229 sysfs_remove_link(&acpi_dev->dev.kobj, physical_node_name);
230 sysfs_remove_link(&dev->kobj, "firmware_node");
231 ACPI_HANDLE_SET(dev, NULL);
232 /* acpi_bind_one increase refcnt by one */
236 mutex_unlock(&acpi_dev->physical_node_lock);
241 dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
244 EXPORT_SYMBOL_GPL(acpi_unbind_one);
246 static int acpi_platform_notify(struct device *dev)
248 struct acpi_bus_type *type = acpi_get_bus_type(dev);
252 ret = acpi_bind_one(dev, NULL);
254 ret = type->find_device(dev, &handle);
256 DBG("Unable to get handle for %s\n", dev_name(dev));
259 ret = acpi_bind_one(dev, handle);
264 if (type && type->setup)
270 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
272 acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
273 DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
274 kfree(buffer.pointer);
276 DBG("Device %s -> No ACPI support\n", dev_name(dev));
282 static int acpi_platform_notify_remove(struct device *dev)
284 struct acpi_bus_type *type;
286 type = acpi_get_bus_type(dev);
287 if (type && type->cleanup)
290 acpi_unbind_one(dev);
294 int __init init_acpi_device_notify(void)
296 if (platform_notify || platform_notify_remove) {
297 printk(KERN_ERR PREFIX "Can't use platform_notify\n");
300 platform_notify = acpi_platform_notify;
301 platform_notify_remove = acpi_platform_notify_remove;