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342 lines
8.1 KiB
342 lines
8.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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 <[email protected]> |
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* Copyright (c) 2005 Intel Corp. |
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*/ |
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#define pr_fmt(fmt) "ACPI: " fmt |
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#include <linux/acpi_iort.h> |
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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 <linux/platform_device.h> |
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#include "internal.h" |
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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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pr_info("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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pr_info("bus type %s unregistered\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(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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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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acpi_dev_get(acpi_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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acpi_dev_put(acpi_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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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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acpi_dev_put(acpi_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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acpi_dev_put(acpi_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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void acpi_device_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) { |
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if (!type) |
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goto err; |
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adev = type->find_companion(dev); |
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if (!adev) { |
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dev_dbg(dev, "ACPI companion not found\n"); |
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goto err; |
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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 err; |
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} |
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adev = ACPI_COMPANION(dev); |
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if (dev_is_platform(dev)) |
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acpi_configure_pmsi_domain(dev); |
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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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acpi_handle_debug(ACPI_HANDLE(dev), "Bound to device %s\n", |
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dev_name(dev)); |
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return; |
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err: |
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dev_dbg(dev, "No ACPI support\n"); |
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} |
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void acpi_device_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; |
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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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}
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