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.
10 #include <linux/acpi_iort.h>
11 #include <linux/export.h>
12 #include <linux/init.h>
13 #include <linux/list.h>
14 #include <linux/device.h>
15 #include <linux/slab.h>
16 #include <linux/rwsem.h>
17 #include <linux/acpi.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/platform_device.h>
23 #define ACPI_GLUE_DEBUG 0
25 #define DBG(fmt, ...) \
26 printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__)
28 #define DBG(fmt, ...) \
31 printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__); \
34 static LIST_HEAD(bus_type_list);
35 static DECLARE_RWSEM(bus_type_sem);
37 #define PHYSICAL_NODE_STRING "physical_node"
38 #define PHYSICAL_NODE_NAME_SIZE (sizeof(PHYSICAL_NODE_STRING) + 10)
40 int register_acpi_bus_type(struct acpi_bus_type *type)
44 if (type && type->match && type->find_companion) {
45 down_write(&bus_type_sem);
46 list_add_tail(&type->list, &bus_type_list);
47 up_write(&bus_type_sem);
48 printk(KERN_INFO PREFIX "bus type %s registered\n", type->name);
53 EXPORT_SYMBOL_GPL(register_acpi_bus_type);
55 int unregister_acpi_bus_type(struct acpi_bus_type *type)
60 down_write(&bus_type_sem);
61 list_del_init(&type->list);
62 up_write(&bus_type_sem);
63 printk(KERN_INFO PREFIX "bus type %s unregistered\n",
69 EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
71 static struct acpi_bus_type *acpi_get_bus_type(struct device *dev)
73 struct acpi_bus_type *tmp, *ret = NULL;
75 down_read(&bus_type_sem);
76 list_for_each_entry(tmp, &bus_type_list, list) {
77 if (tmp->match(dev)) {
82 up_read(&bus_type_sem);
86 #define FIND_CHILD_MIN_SCORE 1
87 #define FIND_CHILD_MAX_SCORE 2
89 static int find_child_checks(struct acpi_device *adev, bool check_children)
91 bool sta_present = true;
92 unsigned long long sta;
95 status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
96 if (status == AE_NOT_FOUND)
98 else if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED))
101 if (check_children && list_empty(&adev->children))
105 * If the device has a _HID returning a valid ACPI/PNP device ID, it is
106 * better to make it look less attractive here, so that the other device
107 * with the same _ADR value (that may not have a valid device ID) can be
108 * matched going forward. [This means a second spec violation in a row,
109 * so whatever we do here is best effort anyway.]
111 return sta_present && !adev->pnp.type.platform_id ?
112 FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE;
115 struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
116 u64 address, bool check_children)
118 struct acpi_device *adev, *ret = NULL;
124 list_for_each_entry(adev, &parent->children, node) {
125 unsigned long long addr;
129 status = acpi_evaluate_integer(adev->handle, METHOD_NAME__ADR,
131 if (ACPI_FAILURE(status) || addr != address)
135 /* This is the first matching object. Save it. */
140 * There is more than one matching device object with the same
141 * _ADR value. That really is unexpected, so we are kind of
142 * beyond the scope of the spec here. We have to choose which
143 * one to return, though.
145 * First, check if the previously found object is good enough
146 * and return it if so. Second, do the same for the object that
150 ret_score = find_child_checks(ret, check_children);
151 if (ret_score == FIND_CHILD_MAX_SCORE)
154 score = find_child_checks(adev, check_children);
155 if (score == FIND_CHILD_MAX_SCORE) {
157 } else if (score > ret_score) {
164 EXPORT_SYMBOL_GPL(acpi_find_child_device);
166 static void acpi_physnode_link_name(char *buf, unsigned int node_id)
169 snprintf(buf, PHYSICAL_NODE_NAME_SIZE,
170 PHYSICAL_NODE_STRING "%u", node_id);
172 strcpy(buf, PHYSICAL_NODE_STRING);
175 int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
177 struct acpi_device_physical_node *physical_node, *pn;
178 char physical_node_name[PHYSICAL_NODE_NAME_SIZE];
179 struct list_head *physnode_list;
180 unsigned int node_id;
181 int retval = -EINVAL;
182 enum dev_dma_attr attr;
184 if (has_acpi_companion(dev)) {
186 dev_warn(dev, "ACPI companion already set\n");
189 acpi_dev = ACPI_COMPANION(dev);
195 get_device(&acpi_dev->dev);
197 physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
198 if (!physical_node) {
203 mutex_lock(&acpi_dev->physical_node_lock);
206 * Keep the list sorted by node_id so that the IDs of removed nodes can
207 * be recycled easily.
209 physnode_list = &acpi_dev->physical_node_list;
211 list_for_each_entry(pn, &acpi_dev->physical_node_list, node) {
213 if (pn->dev == dev) {
214 mutex_unlock(&acpi_dev->physical_node_lock);
216 dev_warn(dev, "Already associated with ACPI node\n");
217 kfree(physical_node);
218 if (ACPI_COMPANION(dev) != acpi_dev)
222 put_device(&acpi_dev->dev);
225 if (pn->node_id == node_id) {
226 physnode_list = &pn->node;
231 physical_node->node_id = node_id;
232 physical_node->dev = dev;
233 list_add(&physical_node->node, physnode_list);
234 acpi_dev->physical_node_count++;
236 if (!has_acpi_companion(dev))
237 ACPI_COMPANION_SET(dev, acpi_dev);
239 attr = acpi_get_dma_attr(acpi_dev);
240 if (attr != DEV_DMA_NOT_SUPPORTED)
241 acpi_dma_configure(dev, attr);
243 acpi_physnode_link_name(physical_node_name, node_id);
244 retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
247 dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n",
248 physical_node_name, retval);
250 retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
253 dev_err(dev, "Failed to create link firmware_node (%d)\n",
256 mutex_unlock(&acpi_dev->physical_node_lock);
258 if (acpi_dev->wakeup.flags.valid)
259 device_set_wakeup_capable(dev, true);
264 ACPI_COMPANION_SET(dev, NULL);
266 put_device(&acpi_dev->dev);
269 EXPORT_SYMBOL_GPL(acpi_bind_one);
271 int acpi_unbind_one(struct device *dev)
273 struct acpi_device *acpi_dev = ACPI_COMPANION(dev);
274 struct acpi_device_physical_node *entry;
279 mutex_lock(&acpi_dev->physical_node_lock);
281 list_for_each_entry(entry, &acpi_dev->physical_node_list, node)
282 if (entry->dev == dev) {
283 char physnode_name[PHYSICAL_NODE_NAME_SIZE];
285 list_del(&entry->node);
286 acpi_dev->physical_node_count--;
288 acpi_physnode_link_name(physnode_name, entry->node_id);
289 sysfs_remove_link(&acpi_dev->dev.kobj, physnode_name);
290 sysfs_remove_link(&dev->kobj, "firmware_node");
291 ACPI_COMPANION_SET(dev, NULL);
292 /* Drop references taken by acpi_bind_one(). */
294 put_device(&acpi_dev->dev);
299 mutex_unlock(&acpi_dev->physical_node_lock);
302 EXPORT_SYMBOL_GPL(acpi_unbind_one);
304 static int acpi_platform_notify(struct device *dev)
306 struct acpi_bus_type *type = acpi_get_bus_type(dev);
307 struct acpi_device *adev;
310 ret = acpi_bind_one(dev, NULL);
312 struct acpi_device *adev;
314 adev = type->find_companion(dev);
316 DBG("Unable to get handle for %s\n", dev_name(dev));
320 ret = acpi_bind_one(dev, adev);
324 adev = ACPI_COMPANION(dev);
328 if (dev->bus == &platform_bus_type)
329 acpi_configure_pmsi_domain(dev);
331 if (type && type->setup)
333 else if (adev->handler && adev->handler->bind)
334 adev->handler->bind(dev);
339 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
341 acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
342 DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
343 kfree(buffer.pointer);
345 DBG("Device %s -> No ACPI support\n", dev_name(dev));
351 static int acpi_platform_notify_remove(struct device *dev)
353 struct acpi_device *adev = ACPI_COMPANION(dev);
354 struct acpi_bus_type *type;
359 type = acpi_get_bus_type(dev);
360 if (type && type->cleanup)
362 else if (adev->handler && adev->handler->unbind)
363 adev->handler->unbind(dev);
365 acpi_unbind_one(dev);
369 void __init init_acpi_device_notify(void)
371 if (platform_notify || platform_notify_remove) {
372 printk(KERN_ERR PREFIX "Can't use platform_notify\n");
375 platform_notify = acpi_platform_notify;
376 platform_notify_remove = acpi_platform_notify_remove;