373 lines
9.0 KiB
C
373 lines
9.0 KiB
C
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/*
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* Link physical devices with ACPI devices support
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*
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* Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
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* Copyright (c) 2005 Intel Corp.
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/export.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/rwsem.h>
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#include <linux/acpi.h>
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#include <linux/dma-mapping.h>
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#include "internal.h"
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#define ACPI_GLUE_DEBUG 0
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#if ACPI_GLUE_DEBUG
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#define DBG(fmt, ...) \
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printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__)
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#else
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#define DBG(fmt, ...) \
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do { \
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if (0) \
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printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__); \
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} while (0)
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#endif
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static LIST_HEAD(bus_type_list);
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static DECLARE_RWSEM(bus_type_sem);
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#define PHYSICAL_NODE_STRING "physical_node"
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#define PHYSICAL_NODE_NAME_SIZE (sizeof(PHYSICAL_NODE_STRING) + 10)
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int register_acpi_bus_type(struct acpi_bus_type *type)
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{
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if (acpi_disabled)
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return -ENODEV;
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if (type && type->match && type->find_companion) {
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down_write(&bus_type_sem);
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list_add_tail(&type->list, &bus_type_list);
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up_write(&bus_type_sem);
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printk(KERN_INFO PREFIX "bus type %s registered\n", type->name);
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return 0;
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}
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return -ENODEV;
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}
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EXPORT_SYMBOL_GPL(register_acpi_bus_type);
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int unregister_acpi_bus_type(struct acpi_bus_type *type)
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{
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if (acpi_disabled)
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return 0;
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if (type) {
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down_write(&bus_type_sem);
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list_del_init(&type->list);
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up_write(&bus_type_sem);
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printk(KERN_INFO PREFIX "bus type %s unregistered\n",
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type->name);
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return 0;
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}
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return -ENODEV;
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}
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EXPORT_SYMBOL_GPL(unregister_acpi_bus_type);
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static struct acpi_bus_type *acpi_get_bus_type(struct device *dev)
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{
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struct acpi_bus_type *tmp, *ret = NULL;
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down_read(&bus_type_sem);
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list_for_each_entry(tmp, &bus_type_list, list) {
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if (tmp->match(dev)) {
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ret = tmp;
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break;
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}
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}
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up_read(&bus_type_sem);
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return ret;
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}
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#define FIND_CHILD_MIN_SCORE 1
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#define FIND_CHILD_MAX_SCORE 2
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static int find_child_checks(struct acpi_device *adev, bool check_children)
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{
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bool sta_present = true;
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unsigned long long sta;
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acpi_status status;
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status = acpi_evaluate_integer(adev->handle, "_STA", NULL, &sta);
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if (status == AE_NOT_FOUND)
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sta_present = false;
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else if (ACPI_FAILURE(status) || !(sta & ACPI_STA_DEVICE_ENABLED))
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return -ENODEV;
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if (check_children && list_empty(&adev->children))
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return -ENODEV;
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/*
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* If the device has a _HID returning a valid ACPI/PNP device ID, it is
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* better to make it look less attractive here, so that the other device
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* with the same _ADR value (that may not have a valid device ID) can be
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* matched going forward. [This means a second spec violation in a row,
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* so whatever we do here is best effort anyway.]
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*/
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return sta_present && !adev->pnp.type.platform_id ?
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FIND_CHILD_MAX_SCORE : FIND_CHILD_MIN_SCORE;
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}
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struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
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u64 address, bool check_children)
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{
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struct acpi_device *adev, *ret = NULL;
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int ret_score = 0;
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if (!parent)
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return NULL;
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list_for_each_entry(adev, &parent->children, node) {
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unsigned long long addr;
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acpi_status status;
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int score;
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status = acpi_evaluate_integer(adev->handle, METHOD_NAME__ADR,
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NULL, &addr);
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if (ACPI_FAILURE(status) || addr != address)
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continue;
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if (!ret) {
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/* This is the first matching object. Save it. */
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ret = adev;
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continue;
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}
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/*
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* There is more than one matching device object with the same
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* _ADR value. That really is unexpected, so we are kind of
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* beyond the scope of the spec here. We have to choose which
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* one to return, though.
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*
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* First, check if the previously found object is good enough
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* and return it if so. Second, do the same for the object that
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* we've just found.
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*/
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if (!ret_score) {
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ret_score = find_child_checks(ret, check_children);
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if (ret_score == FIND_CHILD_MAX_SCORE)
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return ret;
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}
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score = find_child_checks(adev, check_children);
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if (score == FIND_CHILD_MAX_SCORE) {
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return adev;
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} else if (score > ret_score) {
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ret = adev;
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ret_score = score;
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}
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(acpi_find_child_device);
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static void acpi_physnode_link_name(char *buf, unsigned int node_id)
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{
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if (node_id > 0)
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snprintf(buf, PHYSICAL_NODE_NAME_SIZE,
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PHYSICAL_NODE_STRING "%u", node_id);
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else
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strcpy(buf, PHYSICAL_NODE_STRING);
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}
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int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev)
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{
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struct acpi_device_physical_node *physical_node, *pn;
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char physical_node_name[PHYSICAL_NODE_NAME_SIZE];
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struct list_head *physnode_list;
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unsigned int node_id;
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int retval = -EINVAL;
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enum dev_dma_attr attr;
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if (has_acpi_companion(dev)) {
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if (acpi_dev) {
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dev_warn(dev, "ACPI companion already set\n");
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return -EINVAL;
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} else {
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acpi_dev = ACPI_COMPANION(dev);
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}
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}
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if (!acpi_dev)
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return -EINVAL;
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get_device(&acpi_dev->dev);
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get_device(dev);
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physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL);
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if (!physical_node) {
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retval = -ENOMEM;
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goto err;
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}
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mutex_lock(&acpi_dev->physical_node_lock);
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/*
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* Keep the list sorted by node_id so that the IDs of removed nodes can
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* be recycled easily.
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*/
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physnode_list = &acpi_dev->physical_node_list;
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node_id = 0;
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list_for_each_entry(pn, &acpi_dev->physical_node_list, node) {
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/* Sanity check. */
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if (pn->dev == dev) {
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mutex_unlock(&acpi_dev->physical_node_lock);
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dev_warn(dev, "Already associated with ACPI node\n");
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kfree(physical_node);
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if (ACPI_COMPANION(dev) != acpi_dev)
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goto err;
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put_device(dev);
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put_device(&acpi_dev->dev);
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return 0;
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}
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if (pn->node_id == node_id) {
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physnode_list = &pn->node;
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node_id++;
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}
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}
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physical_node->node_id = node_id;
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physical_node->dev = dev;
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list_add(&physical_node->node, physnode_list);
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acpi_dev->physical_node_count++;
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if (!has_acpi_companion(dev))
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ACPI_COMPANION_SET(dev, acpi_dev);
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attr = acpi_get_dma_attr(acpi_dev);
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if (attr != DEV_DMA_NOT_SUPPORTED)
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arch_setup_dma_ops(dev, 0, 0, NULL,
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attr == DEV_DMA_COHERENT);
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acpi_physnode_link_name(physical_node_name, node_id);
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retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
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physical_node_name);
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if (retval)
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dev_err(&acpi_dev->dev, "Failed to create link %s (%d)\n",
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physical_node_name, retval);
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retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
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"firmware_node");
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if (retval)
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dev_err(dev, "Failed to create link firmware_node (%d)\n",
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retval);
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mutex_unlock(&acpi_dev->physical_node_lock);
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if (acpi_dev->wakeup.flags.valid)
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device_set_wakeup_capable(dev, true);
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return 0;
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err:
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ACPI_COMPANION_SET(dev, NULL);
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put_device(dev);
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put_device(&acpi_dev->dev);
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return retval;
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}
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EXPORT_SYMBOL_GPL(acpi_bind_one);
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int acpi_unbind_one(struct device *dev)
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{
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struct acpi_device *acpi_dev = ACPI_COMPANION(dev);
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struct acpi_device_physical_node *entry;
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if (!acpi_dev)
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return 0;
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mutex_lock(&acpi_dev->physical_node_lock);
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list_for_each_entry(entry, &acpi_dev->physical_node_list, node)
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if (entry->dev == dev) {
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char physnode_name[PHYSICAL_NODE_NAME_SIZE];
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list_del(&entry->node);
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acpi_dev->physical_node_count--;
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acpi_physnode_link_name(physnode_name, entry->node_id);
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sysfs_remove_link(&acpi_dev->dev.kobj, physnode_name);
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sysfs_remove_link(&dev->kobj, "firmware_node");
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ACPI_COMPANION_SET(dev, NULL);
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/* Drop references taken by acpi_bind_one(). */
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put_device(dev);
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put_device(&acpi_dev->dev);
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kfree(entry);
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break;
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}
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mutex_unlock(&acpi_dev->physical_node_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(acpi_unbind_one);
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static int acpi_platform_notify(struct device *dev)
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{
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struct acpi_bus_type *type = acpi_get_bus_type(dev);
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struct acpi_device *adev;
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int ret;
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ret = acpi_bind_one(dev, NULL);
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if (ret && type) {
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struct acpi_device *adev;
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adev = type->find_companion(dev);
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if (!adev) {
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DBG("Unable to get handle for %s\n", dev_name(dev));
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ret = -ENODEV;
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goto out;
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}
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ret = acpi_bind_one(dev, adev);
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if (ret)
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goto out;
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}
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adev = ACPI_COMPANION(dev);
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if (!adev)
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goto out;
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if (type && type->setup)
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type->setup(dev);
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else if (adev->handler && adev->handler->bind)
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adev->handler->bind(dev);
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out:
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#if ACPI_GLUE_DEBUG
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if (!ret) {
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer);
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DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
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kfree(buffer.pointer);
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} else
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DBG("Device %s -> No ACPI support\n", dev_name(dev));
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#endif
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return ret;
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}
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static int acpi_platform_notify_remove(struct device *dev)
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{
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struct acpi_device *adev = ACPI_COMPANION(dev);
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struct acpi_bus_type *type;
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if (!adev)
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return 0;
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type = acpi_get_bus_type(dev);
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if (type && type->cleanup)
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type->cleanup(dev);
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else if (adev->handler && adev->handler->unbind)
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adev->handler->unbind(dev);
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acpi_unbind_one(dev);
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return 0;
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}
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void __init init_acpi_device_notify(void)
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{
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if (platform_notify || platform_notify_remove) {
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printk(KERN_ERR PREFIX "Can't use platform_notify\n");
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return;
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}
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platform_notify = acpi_platform_notify;
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platform_notify_remove = acpi_platform_notify_remove;
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}
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