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;
74 down_read(&bus_type_sem);
75 list_for_each_entry(tmp, &bus_type_list, list) {
76 if (tmp->bus == type) {
81 up_read(&bus_type_sem);
85 static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
87 struct acpi_bus_type *tmp;
90 down_read(&bus_type_sem);
91 list_for_each_entry(tmp, &bus_type_list, list) {
92 if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
97 up_read(&bus_type_sem);
101 static acpi_status do_acpi_find_child(acpi_handle handle, u32 lvl_not_used,
102 void *addr_p, void **ret_p)
104 unsigned long long addr;
107 status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &addr);
108 if (ACPI_SUCCESS(status) && addr == *((u64 *)addr_p)) {
110 return AE_CTRL_TERMINATE;
115 acpi_handle acpi_get_child(acpi_handle parent, u64 address)
122 acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, 1, NULL,
123 do_acpi_find_child, &address, &ret);
124 return (acpi_handle)ret;
126 EXPORT_SYMBOL(acpi_get_child);
128 static int acpi_bind_one(struct device *dev, acpi_handle handle)
130 struct acpi_device *acpi_dev;
132 struct acpi_device_physical_node *physical_node, *pn;
133 char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2];
134 int retval = -EINVAL;
136 if (ACPI_HANDLE(dev)) {
138 dev_warn(dev, "ACPI handle is already set\n");
141 handle = ACPI_HANDLE(dev);
148 status = acpi_bus_get_device(handle, &acpi_dev);
149 if (ACPI_FAILURE(status))
152 physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
153 if (!physical_node) {
158 mutex_lock(&acpi_dev->physical_node_lock);
161 list_for_each_entry(pn, &acpi_dev->physical_node_list, node)
162 if (pn->dev == dev) {
163 dev_warn(dev, "Already associated with ACPI node\n");
167 /* allocate physical node id according to physical_node_id_bitmap */
168 physical_node->node_id =
169 find_first_zero_bit(acpi_dev->physical_node_id_bitmap,
170 ACPI_MAX_PHYSICAL_NODE);
171 if (physical_node->node_id >= ACPI_MAX_PHYSICAL_NODE) {
176 set_bit(physical_node->node_id, acpi_dev->physical_node_id_bitmap);
177 physical_node->dev = dev;
178 list_add_tail(&physical_node->node, &acpi_dev->physical_node_list);
179 acpi_dev->physical_node_count++;
181 mutex_unlock(&acpi_dev->physical_node_lock);
183 if (!ACPI_HANDLE(dev))
184 ACPI_HANDLE_SET(dev, acpi_dev->handle);
186 if (!physical_node->node_id)
187 strcpy(physical_node_name, PHYSICAL_NODE_STRING);
189 sprintf(physical_node_name,
190 "physical_node%d", physical_node->node_id);
191 retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
193 retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
196 if (acpi_dev->wakeup.flags.valid)
197 device_set_wakeup_capable(dev, true);
202 ACPI_HANDLE_SET(dev, NULL);
207 mutex_unlock(&acpi_dev->physical_node_lock);
208 kfree(physical_node);
212 static int acpi_unbind_one(struct device *dev)
214 struct acpi_device_physical_node *entry;
215 struct acpi_device *acpi_dev;
217 struct list_head *node, *next;
219 if (!ACPI_HANDLE(dev))
222 status = acpi_bus_get_device(ACPI_HANDLE(dev), &acpi_dev);
223 if (ACPI_FAILURE(status))
226 mutex_lock(&acpi_dev->physical_node_lock);
227 list_for_each_safe(node, next, &acpi_dev->physical_node_list) {
228 char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2];
230 entry = list_entry(node, struct acpi_device_physical_node,
232 if (entry->dev != dev)
236 clear_bit(entry->node_id, acpi_dev->physical_node_id_bitmap);
238 acpi_dev->physical_node_count--;
241 strcpy(physical_node_name, PHYSICAL_NODE_STRING);
243 sprintf(physical_node_name,
244 "physical_node%d", entry->node_id);
246 sysfs_remove_link(&acpi_dev->dev.kobj, physical_node_name);
247 sysfs_remove_link(&dev->kobj, "firmware_node");
248 ACPI_HANDLE_SET(dev, NULL);
249 /* acpi_bind_one increase refcnt by one */
253 mutex_unlock(&acpi_dev->physical_node_lock);
258 dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
262 static int acpi_platform_notify(struct device *dev)
264 struct acpi_bus_type *type;
268 ret = acpi_bind_one(dev, NULL);
269 if (ret && (!dev->bus || !dev->parent)) {
270 /* bridge devices genernally haven't bus or parent */
271 ret = acpi_find_bridge_device(dev, &handle);
273 ret = acpi_bind_one(dev, handle);
279 type = acpi_get_bus_type(dev->bus);
281 if (!type || !type->find_device) {
282 DBG("No ACPI bus support for %s\n", dev_name(dev));
287 ret = type->find_device(dev, &handle);
289 DBG("Unable to get handle for %s\n", dev_name(dev));
292 ret = acpi_bind_one(dev, handle);
297 if (type && type->setup)
303 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
305 acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
306 DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
307 kfree(buffer.pointer);
309 DBG("Device %s -> No ACPI support\n", dev_name(dev));
315 static int acpi_platform_notify_remove(struct device *dev)
317 struct acpi_bus_type *type;
319 type = acpi_get_bus_type(dev->bus);
320 if (type && type->cleanup)
323 acpi_unbind_one(dev);
327 int __init init_acpi_device_notify(void)
329 if (platform_notify || platform_notify_remove) {
330 printk(KERN_ERR PREFIX "Can't use platform_notify\n");
333 platform_notify = acpi_platform_notify;
334 platform_notify_remove = acpi_platform_notify_remove;