mirror of https://gitee.com/openkylin/linux.git
2180 lines
54 KiB
C
2180 lines
54 KiB
C
/*
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* scan.c - support for transforming the ACPI namespace into individual objects
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/acpi.h>
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#include <linux/acpi_iort.h>
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#include <linux/signal.h>
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#include <linux/kthread.h>
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#include <linux/dmi.h>
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#include <linux/nls.h>
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#include <linux/dma-mapping.h>
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#include <asm/pgtable.h>
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#include "internal.h"
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#define _COMPONENT ACPI_BUS_COMPONENT
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ACPI_MODULE_NAME("scan");
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extern struct acpi_device *acpi_root;
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#define ACPI_BUS_CLASS "system_bus"
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#define ACPI_BUS_HID "LNXSYBUS"
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#define ACPI_BUS_DEVICE_NAME "System Bus"
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#define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent)
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#define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page)
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/*
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* If set, devices will be hot-removed even if they cannot be put offline
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* gracefully (from the kernel's standpoint).
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*/
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bool acpi_force_hot_remove;
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static const char *dummy_hid = "device";
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static LIST_HEAD(acpi_dep_list);
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static DEFINE_MUTEX(acpi_dep_list_lock);
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LIST_HEAD(acpi_bus_id_list);
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static DEFINE_MUTEX(acpi_scan_lock);
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static LIST_HEAD(acpi_scan_handlers_list);
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DEFINE_MUTEX(acpi_device_lock);
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LIST_HEAD(acpi_wakeup_device_list);
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static DEFINE_MUTEX(acpi_hp_context_lock);
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/*
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* The UART device described by the SPCR table is the only object which needs
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* special-casing. Everything else is covered by ACPI namespace paths in STAO
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* table.
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*/
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static u64 spcr_uart_addr;
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struct acpi_dep_data {
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struct list_head node;
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acpi_handle master;
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acpi_handle slave;
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};
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void acpi_scan_lock_acquire(void)
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{
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mutex_lock(&acpi_scan_lock);
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}
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EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
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void acpi_scan_lock_release(void)
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{
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mutex_unlock(&acpi_scan_lock);
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}
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EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
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void acpi_lock_hp_context(void)
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{
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mutex_lock(&acpi_hp_context_lock);
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}
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void acpi_unlock_hp_context(void)
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{
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mutex_unlock(&acpi_hp_context_lock);
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}
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void acpi_initialize_hp_context(struct acpi_device *adev,
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struct acpi_hotplug_context *hp,
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int (*notify)(struct acpi_device *, u32),
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void (*uevent)(struct acpi_device *, u32))
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{
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acpi_lock_hp_context();
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hp->notify = notify;
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hp->uevent = uevent;
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acpi_set_hp_context(adev, hp);
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acpi_unlock_hp_context();
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}
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EXPORT_SYMBOL_GPL(acpi_initialize_hp_context);
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int acpi_scan_add_handler(struct acpi_scan_handler *handler)
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{
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if (!handler)
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return -EINVAL;
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list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
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return 0;
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}
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int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
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const char *hotplug_profile_name)
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{
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int error;
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error = acpi_scan_add_handler(handler);
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if (error)
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return error;
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acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name);
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return 0;
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}
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bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent)
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{
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struct acpi_device_physical_node *pn;
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bool offline = true;
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/*
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* acpi_container_offline() calls this for all of the container's
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* children under the container's physical_node_lock lock.
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*/
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mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING);
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list_for_each_entry(pn, &adev->physical_node_list, node)
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if (device_supports_offline(pn->dev) && !pn->dev->offline) {
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if (uevent)
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kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE);
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offline = false;
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break;
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}
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mutex_unlock(&adev->physical_node_lock);
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return offline;
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}
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static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data,
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void **ret_p)
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{
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struct acpi_device *device = NULL;
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struct acpi_device_physical_node *pn;
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bool second_pass = (bool)data;
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acpi_status status = AE_OK;
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if (acpi_bus_get_device(handle, &device))
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return AE_OK;
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if (device->handler && !device->handler->hotplug.enabled) {
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*ret_p = &device->dev;
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return AE_SUPPORT;
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}
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mutex_lock(&device->physical_node_lock);
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list_for_each_entry(pn, &device->physical_node_list, node) {
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int ret;
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if (second_pass) {
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/* Skip devices offlined by the first pass. */
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if (pn->put_online)
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continue;
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} else {
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pn->put_online = false;
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}
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ret = device_offline(pn->dev);
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if (acpi_force_hot_remove)
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continue;
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if (ret >= 0) {
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pn->put_online = !ret;
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} else {
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*ret_p = pn->dev;
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if (second_pass) {
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status = AE_ERROR;
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break;
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}
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}
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}
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mutex_unlock(&device->physical_node_lock);
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return status;
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}
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static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data,
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void **ret_p)
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{
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struct acpi_device *device = NULL;
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struct acpi_device_physical_node *pn;
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if (acpi_bus_get_device(handle, &device))
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return AE_OK;
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mutex_lock(&device->physical_node_lock);
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list_for_each_entry(pn, &device->physical_node_list, node)
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if (pn->put_online) {
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device_online(pn->dev);
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pn->put_online = false;
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}
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mutex_unlock(&device->physical_node_lock);
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return AE_OK;
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}
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static int acpi_scan_try_to_offline(struct acpi_device *device)
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{
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acpi_handle handle = device->handle;
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struct device *errdev = NULL;
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acpi_status status;
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/*
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* Carry out two passes here and ignore errors in the first pass,
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* because if the devices in question are memory blocks and
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* CONFIG_MEMCG is set, one of the blocks may hold data structures
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* that the other blocks depend on, but it is not known in advance which
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* block holds them.
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*
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* If the first pass is successful, the second one isn't needed, though.
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*/
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status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
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NULL, acpi_bus_offline, (void *)false,
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(void **)&errdev);
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if (status == AE_SUPPORT) {
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dev_warn(errdev, "Offline disabled.\n");
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acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
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acpi_bus_online, NULL, NULL, NULL);
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return -EPERM;
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}
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acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev);
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if (errdev) {
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errdev = NULL;
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acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
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NULL, acpi_bus_offline, (void *)true,
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(void **)&errdev);
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if (!errdev || acpi_force_hot_remove)
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acpi_bus_offline(handle, 0, (void *)true,
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(void **)&errdev);
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if (errdev && !acpi_force_hot_remove) {
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dev_warn(errdev, "Offline failed.\n");
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acpi_bus_online(handle, 0, NULL, NULL);
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acpi_walk_namespace(ACPI_TYPE_ANY, handle,
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ACPI_UINT32_MAX, acpi_bus_online,
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NULL, NULL, NULL);
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return -EBUSY;
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}
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}
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return 0;
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}
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static int acpi_scan_hot_remove(struct acpi_device *device)
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{
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acpi_handle handle = device->handle;
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unsigned long long sta;
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acpi_status status;
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if (device->handler && device->handler->hotplug.demand_offline
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&& !acpi_force_hot_remove) {
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if (!acpi_scan_is_offline(device, true))
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return -EBUSY;
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} else {
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int error = acpi_scan_try_to_offline(device);
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if (error)
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return error;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Hot-removing device %s...\n", dev_name(&device->dev)));
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acpi_bus_trim(device);
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acpi_evaluate_lck(handle, 0);
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/*
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* TBD: _EJD support.
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*/
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status = acpi_evaluate_ej0(handle);
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if (status == AE_NOT_FOUND)
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return -ENODEV;
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else if (ACPI_FAILURE(status))
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return -EIO;
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/*
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* Verify if eject was indeed successful. If not, log an error
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* message. No need to call _OST since _EJ0 call was made OK.
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*/
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status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
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if (ACPI_FAILURE(status)) {
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acpi_handle_warn(handle,
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"Status check after eject failed (0x%x)\n", status);
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} else if (sta & ACPI_STA_DEVICE_ENABLED) {
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acpi_handle_warn(handle,
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"Eject incomplete - status 0x%llx\n", sta);
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}
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return 0;
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}
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static int acpi_scan_device_not_present(struct acpi_device *adev)
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{
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if (!acpi_device_enumerated(adev)) {
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dev_warn(&adev->dev, "Still not present\n");
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return -EALREADY;
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}
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acpi_bus_trim(adev);
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return 0;
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}
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static int acpi_scan_device_check(struct acpi_device *adev)
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{
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int error;
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acpi_bus_get_status(adev);
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if (adev->status.present || adev->status.functional) {
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/*
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* This function is only called for device objects for which
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* matching scan handlers exist. The only situation in which
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* the scan handler is not attached to this device object yet
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* is when the device has just appeared (either it wasn't
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* present at all before or it was removed and then added
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* again).
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*/
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if (adev->handler) {
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dev_warn(&adev->dev, "Already enumerated\n");
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return -EALREADY;
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}
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error = acpi_bus_scan(adev->handle);
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if (error) {
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dev_warn(&adev->dev, "Namespace scan failure\n");
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return error;
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}
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if (!adev->handler) {
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dev_warn(&adev->dev, "Enumeration failure\n");
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error = -ENODEV;
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}
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} else {
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error = acpi_scan_device_not_present(adev);
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}
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return error;
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}
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static int acpi_scan_bus_check(struct acpi_device *adev)
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{
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struct acpi_scan_handler *handler = adev->handler;
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struct acpi_device *child;
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int error;
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acpi_bus_get_status(adev);
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if (!(adev->status.present || adev->status.functional)) {
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acpi_scan_device_not_present(adev);
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return 0;
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}
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if (handler && handler->hotplug.scan_dependent)
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return handler->hotplug.scan_dependent(adev);
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error = acpi_bus_scan(adev->handle);
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if (error) {
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dev_warn(&adev->dev, "Namespace scan failure\n");
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return error;
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}
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list_for_each_entry(child, &adev->children, node) {
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error = acpi_scan_bus_check(child);
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if (error)
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return error;
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}
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return 0;
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}
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static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type)
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{
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switch (type) {
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case ACPI_NOTIFY_BUS_CHECK:
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return acpi_scan_bus_check(adev);
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case ACPI_NOTIFY_DEVICE_CHECK:
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return acpi_scan_device_check(adev);
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case ACPI_NOTIFY_EJECT_REQUEST:
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case ACPI_OST_EC_OSPM_EJECT:
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if (adev->handler && !adev->handler->hotplug.enabled) {
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dev_info(&adev->dev, "Eject disabled\n");
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return -EPERM;
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}
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acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST,
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ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
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return acpi_scan_hot_remove(adev);
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}
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return -EINVAL;
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}
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void acpi_device_hotplug(struct acpi_device *adev, u32 src)
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{
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u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
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int error = -ENODEV;
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lock_device_hotplug();
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mutex_lock(&acpi_scan_lock);
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/*
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* The device object's ACPI handle cannot become invalid as long as we
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* are holding acpi_scan_lock, but it might have become invalid before
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* that lock was acquired.
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*/
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if (adev->handle == INVALID_ACPI_HANDLE)
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goto err_out;
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if (adev->flags.is_dock_station) {
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error = dock_notify(adev, src);
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} else if (adev->flags.hotplug_notify) {
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error = acpi_generic_hotplug_event(adev, src);
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if (error == -EPERM) {
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ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
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goto err_out;
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}
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} else {
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int (*notify)(struct acpi_device *, u32);
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acpi_lock_hp_context();
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notify = adev->hp ? adev->hp->notify : NULL;
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acpi_unlock_hp_context();
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/*
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* There may be additional notify handlers for device objects
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* without the .event() callback, so ignore them here.
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*/
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if (notify)
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error = notify(adev, src);
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else
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goto out;
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}
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if (!error)
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ost_code = ACPI_OST_SC_SUCCESS;
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err_out:
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acpi_evaluate_ost(adev->handle, src, ost_code, NULL);
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out:
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acpi_bus_put_acpi_device(adev);
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mutex_unlock(&acpi_scan_lock);
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unlock_device_hotplug();
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}
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static void acpi_free_power_resources_lists(struct acpi_device *device)
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{
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int i;
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if (device->wakeup.flags.valid)
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acpi_power_resources_list_free(&device->wakeup.resources);
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if (!device->power.flags.power_resources)
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return;
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for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
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struct acpi_device_power_state *ps = &device->power.states[i];
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acpi_power_resources_list_free(&ps->resources);
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}
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}
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static void acpi_device_release(struct device *dev)
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{
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struct acpi_device *acpi_dev = to_acpi_device(dev);
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acpi_free_properties(acpi_dev);
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acpi_free_pnp_ids(&acpi_dev->pnp);
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acpi_free_power_resources_lists(acpi_dev);
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kfree(acpi_dev);
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}
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static void acpi_device_del(struct acpi_device *device)
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{
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struct acpi_device_bus_id *acpi_device_bus_id;
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mutex_lock(&acpi_device_lock);
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if (device->parent)
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list_del(&device->node);
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list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node)
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if (!strcmp(acpi_device_bus_id->bus_id,
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acpi_device_hid(device))) {
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if (acpi_device_bus_id->instance_no > 0)
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acpi_device_bus_id->instance_no--;
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else {
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list_del(&acpi_device_bus_id->node);
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kfree(acpi_device_bus_id);
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}
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break;
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}
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list_del(&device->wakeup_list);
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mutex_unlock(&acpi_device_lock);
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acpi_power_add_remove_device(device, false);
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acpi_device_remove_files(device);
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if (device->remove)
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device->remove(device);
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device_del(&device->dev);
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}
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|
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static BLOCKING_NOTIFIER_HEAD(acpi_reconfig_chain);
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static LIST_HEAD(acpi_device_del_list);
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static DEFINE_MUTEX(acpi_device_del_lock);
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|
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static void acpi_device_del_work_fn(struct work_struct *work_not_used)
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{
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for (;;) {
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struct acpi_device *adev;
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mutex_lock(&acpi_device_del_lock);
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if (list_empty(&acpi_device_del_list)) {
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mutex_unlock(&acpi_device_del_lock);
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break;
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}
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adev = list_first_entry(&acpi_device_del_list,
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|
struct acpi_device, del_list);
|
|
list_del(&adev->del_list);
|
|
|
|
mutex_unlock(&acpi_device_del_lock);
|
|
|
|
blocking_notifier_call_chain(&acpi_reconfig_chain,
|
|
ACPI_RECONFIG_DEVICE_REMOVE, adev);
|
|
|
|
acpi_device_del(adev);
|
|
/*
|
|
* Drop references to all power resources that might have been
|
|
* used by the device.
|
|
*/
|
|
acpi_power_transition(adev, ACPI_STATE_D3_COLD);
|
|
put_device(&adev->dev);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* acpi_scan_drop_device - Drop an ACPI device object.
|
|
* @handle: Handle of an ACPI namespace node, not used.
|
|
* @context: Address of the ACPI device object to drop.
|
|
*
|
|
* This is invoked by acpi_ns_delete_node() during the removal of the ACPI
|
|
* namespace node the device object pointed to by @context is attached to.
|
|
*
|
|
* The unregistration is carried out asynchronously to avoid running
|
|
* acpi_device_del() under the ACPICA's namespace mutex and the list is used to
|
|
* ensure the correct ordering (the device objects must be unregistered in the
|
|
* same order in which the corresponding namespace nodes are deleted).
|
|
*/
|
|
static void acpi_scan_drop_device(acpi_handle handle, void *context)
|
|
{
|
|
static DECLARE_WORK(work, acpi_device_del_work_fn);
|
|
struct acpi_device *adev = context;
|
|
|
|
mutex_lock(&acpi_device_del_lock);
|
|
|
|
/*
|
|
* Use the ACPI hotplug workqueue which is ordered, so this work item
|
|
* won't run after any hotplug work items submitted subsequently. That
|
|
* prevents attempts to register device objects identical to those being
|
|
* deleted from happening concurrently (such attempts result from
|
|
* hotplug events handled via the ACPI hotplug workqueue). It also will
|
|
* run after all of the work items submitted previosuly, which helps
|
|
* those work items to ensure that they are not accessing stale device
|
|
* objects.
|
|
*/
|
|
if (list_empty(&acpi_device_del_list))
|
|
acpi_queue_hotplug_work(&work);
|
|
|
|
list_add_tail(&adev->del_list, &acpi_device_del_list);
|
|
/* Make acpi_ns_validate_handle() return NULL for this handle. */
|
|
adev->handle = INVALID_ACPI_HANDLE;
|
|
|
|
mutex_unlock(&acpi_device_del_lock);
|
|
}
|
|
|
|
static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device,
|
|
void (*callback)(void *))
|
|
{
|
|
acpi_status status;
|
|
|
|
if (!device)
|
|
return -EINVAL;
|
|
|
|
status = acpi_get_data_full(handle, acpi_scan_drop_device,
|
|
(void **)device, callback);
|
|
if (ACPI_FAILURE(status) || !*device) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
|
|
handle));
|
|
return -ENODEV;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
|
|
{
|
|
return acpi_get_device_data(handle, device, NULL);
|
|
}
|
|
EXPORT_SYMBOL(acpi_bus_get_device);
|
|
|
|
static void get_acpi_device(void *dev)
|
|
{
|
|
if (dev)
|
|
get_device(&((struct acpi_device *)dev)->dev);
|
|
}
|
|
|
|
struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle)
|
|
{
|
|
struct acpi_device *adev = NULL;
|
|
|
|
acpi_get_device_data(handle, &adev, get_acpi_device);
|
|
return adev;
|
|
}
|
|
|
|
void acpi_bus_put_acpi_device(struct acpi_device *adev)
|
|
{
|
|
put_device(&adev->dev);
|
|
}
|
|
|
|
int acpi_device_add(struct acpi_device *device,
|
|
void (*release)(struct device *))
|
|
{
|
|
int result;
|
|
struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
|
|
int found = 0;
|
|
|
|
if (device->handle) {
|
|
acpi_status status;
|
|
|
|
status = acpi_attach_data(device->handle, acpi_scan_drop_device,
|
|
device);
|
|
if (ACPI_FAILURE(status)) {
|
|
acpi_handle_err(device->handle,
|
|
"Unable to attach device data\n");
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Linkage
|
|
* -------
|
|
* Link this device to its parent and siblings.
|
|
*/
|
|
INIT_LIST_HEAD(&device->children);
|
|
INIT_LIST_HEAD(&device->node);
|
|
INIT_LIST_HEAD(&device->wakeup_list);
|
|
INIT_LIST_HEAD(&device->physical_node_list);
|
|
INIT_LIST_HEAD(&device->del_list);
|
|
mutex_init(&device->physical_node_lock);
|
|
|
|
new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
|
|
if (!new_bus_id) {
|
|
pr_err(PREFIX "Memory allocation error\n");
|
|
result = -ENOMEM;
|
|
goto err_detach;
|
|
}
|
|
|
|
mutex_lock(&acpi_device_lock);
|
|
/*
|
|
* Find suitable bus_id and instance number in acpi_bus_id_list
|
|
* If failed, create one and link it into acpi_bus_id_list
|
|
*/
|
|
list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
|
|
if (!strcmp(acpi_device_bus_id->bus_id,
|
|
acpi_device_hid(device))) {
|
|
acpi_device_bus_id->instance_no++;
|
|
found = 1;
|
|
kfree(new_bus_id);
|
|
break;
|
|
}
|
|
}
|
|
if (!found) {
|
|
acpi_device_bus_id = new_bus_id;
|
|
strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
|
|
acpi_device_bus_id->instance_no = 0;
|
|
list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
|
|
}
|
|
dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
|
|
|
|
if (device->parent)
|
|
list_add_tail(&device->node, &device->parent->children);
|
|
|
|
if (device->wakeup.flags.valid)
|
|
list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
|
|
mutex_unlock(&acpi_device_lock);
|
|
|
|
if (device->parent)
|
|
device->dev.parent = &device->parent->dev;
|
|
device->dev.bus = &acpi_bus_type;
|
|
device->dev.release = release;
|
|
result = device_add(&device->dev);
|
|
if (result) {
|
|
dev_err(&device->dev, "Error registering device\n");
|
|
goto err;
|
|
}
|
|
|
|
result = acpi_device_setup_files(device);
|
|
if (result)
|
|
printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
|
|
dev_name(&device->dev));
|
|
|
|
return 0;
|
|
|
|
err:
|
|
mutex_lock(&acpi_device_lock);
|
|
if (device->parent)
|
|
list_del(&device->node);
|
|
list_del(&device->wakeup_list);
|
|
mutex_unlock(&acpi_device_lock);
|
|
|
|
err_detach:
|
|
acpi_detach_data(device->handle, acpi_scan_drop_device);
|
|
return result;
|
|
}
|
|
|
|
/* --------------------------------------------------------------------------
|
|
Device Enumeration
|
|
-------------------------------------------------------------------------- */
|
|
static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
|
|
{
|
|
struct acpi_device *device = NULL;
|
|
acpi_status status;
|
|
|
|
/*
|
|
* Fixed hardware devices do not appear in the namespace and do not
|
|
* have handles, but we fabricate acpi_devices for them, so we have
|
|
* to deal with them specially.
|
|
*/
|
|
if (!handle)
|
|
return acpi_root;
|
|
|
|
do {
|
|
status = acpi_get_parent(handle, &handle);
|
|
if (ACPI_FAILURE(status))
|
|
return status == AE_NULL_ENTRY ? NULL : acpi_root;
|
|
} while (acpi_bus_get_device(handle, &device));
|
|
return device;
|
|
}
|
|
|
|
acpi_status
|
|
acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
|
|
{
|
|
acpi_status status;
|
|
acpi_handle tmp;
|
|
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
|
|
union acpi_object *obj;
|
|
|
|
status = acpi_get_handle(handle, "_EJD", &tmp);
|
|
if (ACPI_FAILURE(status))
|
|
return status;
|
|
|
|
status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
|
|
if (ACPI_SUCCESS(status)) {
|
|
obj = buffer.pointer;
|
|
status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
|
|
ejd);
|
|
kfree(buffer.pointer);
|
|
}
|
|
return status;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
|
|
|
|
static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
|
|
struct acpi_device_wakeup *wakeup)
|
|
{
|
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
|
|
union acpi_object *package = NULL;
|
|
union acpi_object *element = NULL;
|
|
acpi_status status;
|
|
int err = -ENODATA;
|
|
|
|
if (!wakeup)
|
|
return -EINVAL;
|
|
|
|
INIT_LIST_HEAD(&wakeup->resources);
|
|
|
|
/* _PRW */
|
|
status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
|
|
return err;
|
|
}
|
|
|
|
package = (union acpi_object *)buffer.pointer;
|
|
|
|
if (!package || package->package.count < 2)
|
|
goto out;
|
|
|
|
element = &(package->package.elements[0]);
|
|
if (!element)
|
|
goto out;
|
|
|
|
if (element->type == ACPI_TYPE_PACKAGE) {
|
|
if ((element->package.count < 2) ||
|
|
(element->package.elements[0].type !=
|
|
ACPI_TYPE_LOCAL_REFERENCE)
|
|
|| (element->package.elements[1].type != ACPI_TYPE_INTEGER))
|
|
goto out;
|
|
|
|
wakeup->gpe_device =
|
|
element->package.elements[0].reference.handle;
|
|
wakeup->gpe_number =
|
|
(u32) element->package.elements[1].integer.value;
|
|
} else if (element->type == ACPI_TYPE_INTEGER) {
|
|
wakeup->gpe_device = NULL;
|
|
wakeup->gpe_number = element->integer.value;
|
|
} else {
|
|
goto out;
|
|
}
|
|
|
|
element = &(package->package.elements[1]);
|
|
if (element->type != ACPI_TYPE_INTEGER)
|
|
goto out;
|
|
|
|
wakeup->sleep_state = element->integer.value;
|
|
|
|
err = acpi_extract_power_resources(package, 2, &wakeup->resources);
|
|
if (err)
|
|
goto out;
|
|
|
|
if (!list_empty(&wakeup->resources)) {
|
|
int sleep_state;
|
|
|
|
err = acpi_power_wakeup_list_init(&wakeup->resources,
|
|
&sleep_state);
|
|
if (err) {
|
|
acpi_handle_warn(handle, "Retrieving current states "
|
|
"of wakeup power resources failed\n");
|
|
acpi_power_resources_list_free(&wakeup->resources);
|
|
goto out;
|
|
}
|
|
if (sleep_state < wakeup->sleep_state) {
|
|
acpi_handle_warn(handle, "Overriding _PRW sleep state "
|
|
"(S%d) by S%d from power resources\n",
|
|
(int)wakeup->sleep_state, sleep_state);
|
|
wakeup->sleep_state = sleep_state;
|
|
}
|
|
}
|
|
|
|
out:
|
|
kfree(buffer.pointer);
|
|
return err;
|
|
}
|
|
|
|
static void acpi_wakeup_gpe_init(struct acpi_device *device)
|
|
{
|
|
static const struct acpi_device_id button_device_ids[] = {
|
|
{"PNP0C0C", 0},
|
|
{"PNP0C0D", 0},
|
|
{"PNP0C0E", 0},
|
|
{"", 0},
|
|
};
|
|
struct acpi_device_wakeup *wakeup = &device->wakeup;
|
|
acpi_status status;
|
|
acpi_event_status event_status;
|
|
|
|
wakeup->flags.notifier_present = 0;
|
|
|
|
/* Power button, Lid switch always enable wakeup */
|
|
if (!acpi_match_device_ids(device, button_device_ids)) {
|
|
wakeup->flags.run_wake = 1;
|
|
if (!acpi_match_device_ids(device, &button_device_ids[1])) {
|
|
/* Do not use Lid/sleep button for S5 wakeup */
|
|
if (wakeup->sleep_state == ACPI_STATE_S5)
|
|
wakeup->sleep_state = ACPI_STATE_S4;
|
|
}
|
|
acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number);
|
|
device_set_wakeup_capable(&device->dev, true);
|
|
return;
|
|
}
|
|
|
|
acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device,
|
|
wakeup->gpe_number);
|
|
status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number,
|
|
&event_status);
|
|
if (ACPI_FAILURE(status))
|
|
return;
|
|
|
|
wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER);
|
|
}
|
|
|
|
static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
|
|
{
|
|
int err;
|
|
|
|
/* Presence of _PRW indicates wake capable */
|
|
if (!acpi_has_method(device->handle, "_PRW"))
|
|
return;
|
|
|
|
err = acpi_bus_extract_wakeup_device_power_package(device->handle,
|
|
&device->wakeup);
|
|
if (err) {
|
|
dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
|
|
return;
|
|
}
|
|
|
|
device->wakeup.flags.valid = 1;
|
|
device->wakeup.prepare_count = 0;
|
|
acpi_wakeup_gpe_init(device);
|
|
/* Call _PSW/_DSW object to disable its ability to wake the sleeping
|
|
* system for the ACPI device with the _PRW object.
|
|
* The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
|
|
* So it is necessary to call _DSW object first. Only when it is not
|
|
* present will the _PSW object used.
|
|
*/
|
|
err = acpi_device_sleep_wake(device, 0, 0, 0);
|
|
if (err)
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
|
|
"error in _DSW or _PSW evaluation\n"));
|
|
}
|
|
|
|
static void acpi_bus_init_power_state(struct acpi_device *device, int state)
|
|
{
|
|
struct acpi_device_power_state *ps = &device->power.states[state];
|
|
char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
|
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
|
|
acpi_status status;
|
|
|
|
INIT_LIST_HEAD(&ps->resources);
|
|
|
|
/* Evaluate "_PRx" to get referenced power resources */
|
|
status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
|
|
if (ACPI_SUCCESS(status)) {
|
|
union acpi_object *package = buffer.pointer;
|
|
|
|
if (buffer.length && package
|
|
&& package->type == ACPI_TYPE_PACKAGE
|
|
&& package->package.count) {
|
|
int err = acpi_extract_power_resources(package, 0,
|
|
&ps->resources);
|
|
if (!err)
|
|
device->power.flags.power_resources = 1;
|
|
}
|
|
ACPI_FREE(buffer.pointer);
|
|
}
|
|
|
|
/* Evaluate "_PSx" to see if we can do explicit sets */
|
|
pathname[2] = 'S';
|
|
if (acpi_has_method(device->handle, pathname))
|
|
ps->flags.explicit_set = 1;
|
|
|
|
/* State is valid if there are means to put the device into it. */
|
|
if (!list_empty(&ps->resources) || ps->flags.explicit_set)
|
|
ps->flags.valid = 1;
|
|
|
|
ps->power = -1; /* Unknown - driver assigned */
|
|
ps->latency = -1; /* Unknown - driver assigned */
|
|
}
|
|
|
|
static void acpi_bus_get_power_flags(struct acpi_device *device)
|
|
{
|
|
u32 i;
|
|
|
|
/* Presence of _PS0|_PR0 indicates 'power manageable' */
|
|
if (!acpi_has_method(device->handle, "_PS0") &&
|
|
!acpi_has_method(device->handle, "_PR0"))
|
|
return;
|
|
|
|
device->flags.power_manageable = 1;
|
|
|
|
/*
|
|
* Power Management Flags
|
|
*/
|
|
if (acpi_has_method(device->handle, "_PSC"))
|
|
device->power.flags.explicit_get = 1;
|
|
|
|
if (acpi_has_method(device->handle, "_IRC"))
|
|
device->power.flags.inrush_current = 1;
|
|
|
|
if (acpi_has_method(device->handle, "_DSW"))
|
|
device->power.flags.dsw_present = 1;
|
|
|
|
/*
|
|
* Enumerate supported power management states
|
|
*/
|
|
for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
|
|
acpi_bus_init_power_state(device, i);
|
|
|
|
INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
|
|
if (!list_empty(&device->power.states[ACPI_STATE_D3_HOT].resources))
|
|
device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1;
|
|
|
|
/* Set defaults for D0 and D3hot states (always valid) */
|
|
device->power.states[ACPI_STATE_D0].flags.valid = 1;
|
|
device->power.states[ACPI_STATE_D0].power = 100;
|
|
device->power.states[ACPI_STATE_D3_HOT].flags.valid = 1;
|
|
|
|
if (acpi_bus_init_power(device))
|
|
device->flags.power_manageable = 0;
|
|
}
|
|
|
|
static void acpi_bus_get_flags(struct acpi_device *device)
|
|
{
|
|
/* Presence of _STA indicates 'dynamic_status' */
|
|
if (acpi_has_method(device->handle, "_STA"))
|
|
device->flags.dynamic_status = 1;
|
|
|
|
/* Presence of _RMV indicates 'removable' */
|
|
if (acpi_has_method(device->handle, "_RMV"))
|
|
device->flags.removable = 1;
|
|
|
|
/* Presence of _EJD|_EJ0 indicates 'ejectable' */
|
|
if (acpi_has_method(device->handle, "_EJD") ||
|
|
acpi_has_method(device->handle, "_EJ0"))
|
|
device->flags.ejectable = 1;
|
|
}
|
|
|
|
static void acpi_device_get_busid(struct acpi_device *device)
|
|
{
|
|
char bus_id[5] = { '?', 0 };
|
|
struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
|
|
int i = 0;
|
|
|
|
/*
|
|
* Bus ID
|
|
* ------
|
|
* The device's Bus ID is simply the object name.
|
|
* TBD: Shouldn't this value be unique (within the ACPI namespace)?
|
|
*/
|
|
if (ACPI_IS_ROOT_DEVICE(device)) {
|
|
strcpy(device->pnp.bus_id, "ACPI");
|
|
return;
|
|
}
|
|
|
|
switch (device->device_type) {
|
|
case ACPI_BUS_TYPE_POWER_BUTTON:
|
|
strcpy(device->pnp.bus_id, "PWRF");
|
|
break;
|
|
case ACPI_BUS_TYPE_SLEEP_BUTTON:
|
|
strcpy(device->pnp.bus_id, "SLPF");
|
|
break;
|
|
default:
|
|
acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
|
|
/* Clean up trailing underscores (if any) */
|
|
for (i = 3; i > 1; i--) {
|
|
if (bus_id[i] == '_')
|
|
bus_id[i] = '\0';
|
|
else
|
|
break;
|
|
}
|
|
strcpy(device->pnp.bus_id, bus_id);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* acpi_ata_match - see if an acpi object is an ATA device
|
|
*
|
|
* If an acpi object has one of the ACPI ATA methods defined,
|
|
* then we can safely call it an ATA device.
|
|
*/
|
|
bool acpi_ata_match(acpi_handle handle)
|
|
{
|
|
return acpi_has_method(handle, "_GTF") ||
|
|
acpi_has_method(handle, "_GTM") ||
|
|
acpi_has_method(handle, "_STM") ||
|
|
acpi_has_method(handle, "_SDD");
|
|
}
|
|
|
|
/*
|
|
* acpi_bay_match - see if an acpi object is an ejectable driver bay
|
|
*
|
|
* If an acpi object is ejectable and has one of the ACPI ATA methods defined,
|
|
* then we can safely call it an ejectable drive bay
|
|
*/
|
|
bool acpi_bay_match(acpi_handle handle)
|
|
{
|
|
acpi_handle phandle;
|
|
|
|
if (!acpi_has_method(handle, "_EJ0"))
|
|
return false;
|
|
if (acpi_ata_match(handle))
|
|
return true;
|
|
if (ACPI_FAILURE(acpi_get_parent(handle, &phandle)))
|
|
return false;
|
|
|
|
return acpi_ata_match(phandle);
|
|
}
|
|
|
|
bool acpi_device_is_battery(struct acpi_device *adev)
|
|
{
|
|
struct acpi_hardware_id *hwid;
|
|
|
|
list_for_each_entry(hwid, &adev->pnp.ids, list)
|
|
if (!strcmp("PNP0C0A", hwid->id))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool is_ejectable_bay(struct acpi_device *adev)
|
|
{
|
|
acpi_handle handle = adev->handle;
|
|
|
|
if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev))
|
|
return true;
|
|
|
|
return acpi_bay_match(handle);
|
|
}
|
|
|
|
/*
|
|
* acpi_dock_match - see if an acpi object has a _DCK method
|
|
*/
|
|
bool acpi_dock_match(acpi_handle handle)
|
|
{
|
|
return acpi_has_method(handle, "_DCK");
|
|
}
|
|
|
|
static acpi_status
|
|
acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
|
|
void **return_value)
|
|
{
|
|
long *cap = context;
|
|
|
|
if (acpi_has_method(handle, "_BCM") &&
|
|
acpi_has_method(handle, "_BCL")) {
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
|
|
"support\n"));
|
|
*cap |= ACPI_VIDEO_BACKLIGHT;
|
|
/* We have backlight support, no need to scan further */
|
|
return AE_CTRL_TERMINATE;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Returns true if the ACPI object is a video device which can be
|
|
* handled by video.ko.
|
|
* The device will get a Linux specific CID added in scan.c to
|
|
* identify the device as an ACPI graphics device
|
|
* Be aware that the graphics device may not be physically present
|
|
* Use acpi_video_get_capabilities() to detect general ACPI video
|
|
* capabilities of present cards
|
|
*/
|
|
long acpi_is_video_device(acpi_handle handle)
|
|
{
|
|
long video_caps = 0;
|
|
|
|
/* Is this device able to support video switching ? */
|
|
if (acpi_has_method(handle, "_DOD") || acpi_has_method(handle, "_DOS"))
|
|
video_caps |= ACPI_VIDEO_OUTPUT_SWITCHING;
|
|
|
|
/* Is this device able to retrieve a video ROM ? */
|
|
if (acpi_has_method(handle, "_ROM"))
|
|
video_caps |= ACPI_VIDEO_ROM_AVAILABLE;
|
|
|
|
/* Is this device able to configure which video head to be POSTed ? */
|
|
if (acpi_has_method(handle, "_VPO") &&
|
|
acpi_has_method(handle, "_GPD") &&
|
|
acpi_has_method(handle, "_SPD"))
|
|
video_caps |= ACPI_VIDEO_DEVICE_POSTING;
|
|
|
|
/* Only check for backlight functionality if one of the above hit. */
|
|
if (video_caps)
|
|
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
|
|
ACPI_UINT32_MAX, acpi_backlight_cap_match, NULL,
|
|
&video_caps, NULL);
|
|
|
|
return video_caps;
|
|
}
|
|
EXPORT_SYMBOL(acpi_is_video_device);
|
|
|
|
const char *acpi_device_hid(struct acpi_device *device)
|
|
{
|
|
struct acpi_hardware_id *hid;
|
|
|
|
if (list_empty(&device->pnp.ids))
|
|
return dummy_hid;
|
|
|
|
hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
|
|
return hid->id;
|
|
}
|
|
EXPORT_SYMBOL(acpi_device_hid);
|
|
|
|
static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id)
|
|
{
|
|
struct acpi_hardware_id *id;
|
|
|
|
id = kmalloc(sizeof(*id), GFP_KERNEL);
|
|
if (!id)
|
|
return;
|
|
|
|
id->id = kstrdup_const(dev_id, GFP_KERNEL);
|
|
if (!id->id) {
|
|
kfree(id);
|
|
return;
|
|
}
|
|
|
|
list_add_tail(&id->list, &pnp->ids);
|
|
pnp->type.hardware_id = 1;
|
|
}
|
|
|
|
/*
|
|
* Old IBM workstations have a DSDT bug wherein the SMBus object
|
|
* lacks the SMBUS01 HID and the methods do not have the necessary "_"
|
|
* prefix. Work around this.
|
|
*/
|
|
static bool acpi_ibm_smbus_match(acpi_handle handle)
|
|
{
|
|
char node_name[ACPI_PATH_SEGMENT_LENGTH];
|
|
struct acpi_buffer path = { sizeof(node_name), node_name };
|
|
|
|
if (!dmi_name_in_vendors("IBM"))
|
|
return false;
|
|
|
|
/* Look for SMBS object */
|
|
if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) ||
|
|
strcmp("SMBS", path.pointer))
|
|
return false;
|
|
|
|
/* Does it have the necessary (but misnamed) methods? */
|
|
if (acpi_has_method(handle, "SBI") &&
|
|
acpi_has_method(handle, "SBR") &&
|
|
acpi_has_method(handle, "SBW"))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool acpi_object_is_system_bus(acpi_handle handle)
|
|
{
|
|
acpi_handle tmp;
|
|
|
|
if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) &&
|
|
tmp == handle)
|
|
return true;
|
|
if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) &&
|
|
tmp == handle)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp,
|
|
int device_type)
|
|
{
|
|
acpi_status status;
|
|
struct acpi_device_info *info;
|
|
struct acpi_pnp_device_id_list *cid_list;
|
|
int i;
|
|
|
|
switch (device_type) {
|
|
case ACPI_BUS_TYPE_DEVICE:
|
|
if (handle == ACPI_ROOT_OBJECT) {
|
|
acpi_add_id(pnp, ACPI_SYSTEM_HID);
|
|
break;
|
|
}
|
|
|
|
status = acpi_get_object_info(handle, &info);
|
|
if (ACPI_FAILURE(status)) {
|
|
pr_err(PREFIX "%s: Error reading device info\n",
|
|
__func__);
|
|
return;
|
|
}
|
|
|
|
if (info->valid & ACPI_VALID_HID) {
|
|
acpi_add_id(pnp, info->hardware_id.string);
|
|
pnp->type.platform_id = 1;
|
|
}
|
|
if (info->valid & ACPI_VALID_CID) {
|
|
cid_list = &info->compatible_id_list;
|
|
for (i = 0; i < cid_list->count; i++)
|
|
acpi_add_id(pnp, cid_list->ids[i].string);
|
|
}
|
|
if (info->valid & ACPI_VALID_ADR) {
|
|
pnp->bus_address = info->address;
|
|
pnp->type.bus_address = 1;
|
|
}
|
|
if (info->valid & ACPI_VALID_UID)
|
|
pnp->unique_id = kstrdup(info->unique_id.string,
|
|
GFP_KERNEL);
|
|
if (info->valid & ACPI_VALID_CLS)
|
|
acpi_add_id(pnp, info->class_code.string);
|
|
|
|
kfree(info);
|
|
|
|
/*
|
|
* Some devices don't reliably have _HIDs & _CIDs, so add
|
|
* synthetic HIDs to make sure drivers can find them.
|
|
*/
|
|
if (acpi_is_video_device(handle))
|
|
acpi_add_id(pnp, ACPI_VIDEO_HID);
|
|
else if (acpi_bay_match(handle))
|
|
acpi_add_id(pnp, ACPI_BAY_HID);
|
|
else if (acpi_dock_match(handle))
|
|
acpi_add_id(pnp, ACPI_DOCK_HID);
|
|
else if (acpi_ibm_smbus_match(handle))
|
|
acpi_add_id(pnp, ACPI_SMBUS_IBM_HID);
|
|
else if (list_empty(&pnp->ids) &&
|
|
acpi_object_is_system_bus(handle)) {
|
|
/* \_SB, \_TZ, LNXSYBUS */
|
|
acpi_add_id(pnp, ACPI_BUS_HID);
|
|
strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
|
|
strcpy(pnp->device_class, ACPI_BUS_CLASS);
|
|
}
|
|
|
|
break;
|
|
case ACPI_BUS_TYPE_POWER:
|
|
acpi_add_id(pnp, ACPI_POWER_HID);
|
|
break;
|
|
case ACPI_BUS_TYPE_PROCESSOR:
|
|
acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID);
|
|
break;
|
|
case ACPI_BUS_TYPE_THERMAL:
|
|
acpi_add_id(pnp, ACPI_THERMAL_HID);
|
|
break;
|
|
case ACPI_BUS_TYPE_POWER_BUTTON:
|
|
acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF);
|
|
break;
|
|
case ACPI_BUS_TYPE_SLEEP_BUTTON:
|
|
acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void acpi_free_pnp_ids(struct acpi_device_pnp *pnp)
|
|
{
|
|
struct acpi_hardware_id *id, *tmp;
|
|
|
|
list_for_each_entry_safe(id, tmp, &pnp->ids, list) {
|
|
kfree_const(id->id);
|
|
kfree(id);
|
|
}
|
|
kfree(pnp->unique_id);
|
|
}
|
|
|
|
/**
|
|
* acpi_dma_supported - Check DMA support for the specified device.
|
|
* @adev: The pointer to acpi device
|
|
*
|
|
* Return false if DMA is not supported. Otherwise, return true
|
|
*/
|
|
bool acpi_dma_supported(struct acpi_device *adev)
|
|
{
|
|
if (!adev)
|
|
return false;
|
|
|
|
if (adev->flags.cca_seen)
|
|
return true;
|
|
|
|
/*
|
|
* Per ACPI 6.0 sec 6.2.17, assume devices can do cache-coherent
|
|
* DMA on "Intel platforms". Presumably that includes all x86 and
|
|
* ia64, and other arches will set CONFIG_ACPI_CCA_REQUIRED=y.
|
|
*/
|
|
if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* acpi_get_dma_attr - Check the supported DMA attr for the specified device.
|
|
* @adev: The pointer to acpi device
|
|
*
|
|
* Return enum dev_dma_attr.
|
|
*/
|
|
enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev)
|
|
{
|
|
if (!acpi_dma_supported(adev))
|
|
return DEV_DMA_NOT_SUPPORTED;
|
|
|
|
if (adev->flags.coherent_dma)
|
|
return DEV_DMA_COHERENT;
|
|
else
|
|
return DEV_DMA_NON_COHERENT;
|
|
}
|
|
|
|
/**
|
|
* acpi_dma_configure - Set-up DMA configuration for the device.
|
|
* @dev: The pointer to the device
|
|
* @attr: device dma attributes
|
|
*/
|
|
void acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
|
|
{
|
|
const struct iommu_ops *iommu;
|
|
|
|
iort_set_dma_mask(dev);
|
|
|
|
iommu = iort_iommu_configure(dev);
|
|
|
|
/*
|
|
* Assume dma valid range starts at 0 and covers the whole
|
|
* coherent_dma_mask.
|
|
*/
|
|
arch_setup_dma_ops(dev, 0, dev->coherent_dma_mask + 1, iommu,
|
|
attr == DEV_DMA_COHERENT);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dma_configure);
|
|
|
|
/**
|
|
* acpi_dma_deconfigure - Tear-down DMA configuration for the device.
|
|
* @dev: The pointer to the device
|
|
*/
|
|
void acpi_dma_deconfigure(struct device *dev)
|
|
{
|
|
arch_teardown_dma_ops(dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_dma_deconfigure);
|
|
|
|
static void acpi_init_coherency(struct acpi_device *adev)
|
|
{
|
|
unsigned long long cca = 0;
|
|
acpi_status status;
|
|
struct acpi_device *parent = adev->parent;
|
|
|
|
if (parent && parent->flags.cca_seen) {
|
|
/*
|
|
* From ACPI spec, OSPM will ignore _CCA if an ancestor
|
|
* already saw one.
|
|
*/
|
|
adev->flags.cca_seen = 1;
|
|
cca = parent->flags.coherent_dma;
|
|
} else {
|
|
status = acpi_evaluate_integer(adev->handle, "_CCA",
|
|
NULL, &cca);
|
|
if (ACPI_SUCCESS(status))
|
|
adev->flags.cca_seen = 1;
|
|
else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED))
|
|
/*
|
|
* If architecture does not specify that _CCA is
|
|
* required for DMA-able devices (e.g. x86),
|
|
* we default to _CCA=1.
|
|
*/
|
|
cca = 1;
|
|
else
|
|
acpi_handle_debug(adev->handle,
|
|
"ACPI device is missing _CCA.\n");
|
|
}
|
|
|
|
adev->flags.coherent_dma = cca;
|
|
}
|
|
|
|
void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
|
|
int type, unsigned long long sta)
|
|
{
|
|
INIT_LIST_HEAD(&device->pnp.ids);
|
|
device->device_type = type;
|
|
device->handle = handle;
|
|
device->parent = acpi_bus_get_parent(handle);
|
|
device->fwnode.type = FWNODE_ACPI;
|
|
acpi_set_device_status(device, sta);
|
|
acpi_device_get_busid(device);
|
|
acpi_set_pnp_ids(handle, &device->pnp, type);
|
|
acpi_init_properties(device);
|
|
acpi_bus_get_flags(device);
|
|
device->flags.match_driver = false;
|
|
device->flags.initialized = true;
|
|
acpi_device_clear_enumerated(device);
|
|
device_initialize(&device->dev);
|
|
dev_set_uevent_suppress(&device->dev, true);
|
|
acpi_init_coherency(device);
|
|
}
|
|
|
|
void acpi_device_add_finalize(struct acpi_device *device)
|
|
{
|
|
dev_set_uevent_suppress(&device->dev, false);
|
|
kobject_uevent(&device->dev.kobj, KOBJ_ADD);
|
|
}
|
|
|
|
static int acpi_add_single_object(struct acpi_device **child,
|
|
acpi_handle handle, int type,
|
|
unsigned long long sta)
|
|
{
|
|
int result;
|
|
struct acpi_device *device;
|
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
|
|
|
|
device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
|
|
if (!device) {
|
|
printk(KERN_ERR PREFIX "Memory allocation error\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
acpi_init_device_object(device, handle, type, sta);
|
|
acpi_bus_get_power_flags(device);
|
|
acpi_bus_get_wakeup_device_flags(device);
|
|
|
|
result = acpi_device_add(device, acpi_device_release);
|
|
if (result) {
|
|
acpi_device_release(&device->dev);
|
|
return result;
|
|
}
|
|
|
|
acpi_power_add_remove_device(device, true);
|
|
acpi_device_add_finalize(device);
|
|
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
|
|
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
|
|
dev_name(&device->dev), (char *) buffer.pointer,
|
|
device->parent ? dev_name(&device->parent->dev) : "(null)"));
|
|
kfree(buffer.pointer);
|
|
*child = device;
|
|
return 0;
|
|
}
|
|
|
|
static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
|
|
void *context)
|
|
{
|
|
struct resource *res = context;
|
|
|
|
if (acpi_dev_resource_memory(ares, res))
|
|
return AE_CTRL_TERMINATE;
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
static bool acpi_device_should_be_hidden(acpi_handle handle)
|
|
{
|
|
acpi_status status;
|
|
struct resource res;
|
|
|
|
/* Check if it should ignore the UART device */
|
|
if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
|
|
return false;
|
|
|
|
/*
|
|
* The UART device described in SPCR table is assumed to have only one
|
|
* memory resource present. So we only look for the first one here.
|
|
*/
|
|
status = acpi_walk_resources(handle, METHOD_NAME__CRS,
|
|
acpi_get_resource_memory, &res);
|
|
if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
|
|
return false;
|
|
|
|
acpi_handle_info(handle, "The UART device @%pa in SPCR table will be hidden\n",
|
|
&res.start);
|
|
|
|
return true;
|
|
}
|
|
|
|
static int acpi_bus_type_and_status(acpi_handle handle, int *type,
|
|
unsigned long long *sta)
|
|
{
|
|
acpi_status status;
|
|
acpi_object_type acpi_type;
|
|
|
|
status = acpi_get_type(handle, &acpi_type);
|
|
if (ACPI_FAILURE(status))
|
|
return -ENODEV;
|
|
|
|
switch (acpi_type) {
|
|
case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */
|
|
case ACPI_TYPE_DEVICE:
|
|
if (acpi_device_should_be_hidden(handle))
|
|
return -ENODEV;
|
|
|
|
*type = ACPI_BUS_TYPE_DEVICE;
|
|
status = acpi_bus_get_status_handle(handle, sta);
|
|
if (ACPI_FAILURE(status))
|
|
*sta = 0;
|
|
break;
|
|
case ACPI_TYPE_PROCESSOR:
|
|
*type = ACPI_BUS_TYPE_PROCESSOR;
|
|
status = acpi_bus_get_status_handle(handle, sta);
|
|
if (ACPI_FAILURE(status))
|
|
return -ENODEV;
|
|
break;
|
|
case ACPI_TYPE_THERMAL:
|
|
*type = ACPI_BUS_TYPE_THERMAL;
|
|
*sta = ACPI_STA_DEFAULT;
|
|
break;
|
|
case ACPI_TYPE_POWER:
|
|
*type = ACPI_BUS_TYPE_POWER;
|
|
*sta = ACPI_STA_DEFAULT;
|
|
break;
|
|
default:
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
bool acpi_device_is_present(struct acpi_device *adev)
|
|
{
|
|
if (adev->status.present || adev->status.functional)
|
|
return true;
|
|
|
|
adev->flags.initialized = false;
|
|
return false;
|
|
}
|
|
|
|
static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler,
|
|
const char *idstr,
|
|
const struct acpi_device_id **matchid)
|
|
{
|
|
const struct acpi_device_id *devid;
|
|
|
|
if (handler->match)
|
|
return handler->match(idstr, matchid);
|
|
|
|
for (devid = handler->ids; devid->id[0]; devid++)
|
|
if (!strcmp((char *)devid->id, idstr)) {
|
|
if (matchid)
|
|
*matchid = devid;
|
|
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
|
|
const struct acpi_device_id **matchid)
|
|
{
|
|
struct acpi_scan_handler *handler;
|
|
|
|
list_for_each_entry(handler, &acpi_scan_handlers_list, list_node)
|
|
if (acpi_scan_handler_matching(handler, idstr, matchid))
|
|
return handler;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val)
|
|
{
|
|
if (!!hotplug->enabled == !!val)
|
|
return;
|
|
|
|
mutex_lock(&acpi_scan_lock);
|
|
|
|
hotplug->enabled = val;
|
|
|
|
mutex_unlock(&acpi_scan_lock);
|
|
}
|
|
|
|
static void acpi_scan_init_hotplug(struct acpi_device *adev)
|
|
{
|
|
struct acpi_hardware_id *hwid;
|
|
|
|
if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) {
|
|
acpi_dock_add(adev);
|
|
return;
|
|
}
|
|
list_for_each_entry(hwid, &adev->pnp.ids, list) {
|
|
struct acpi_scan_handler *handler;
|
|
|
|
handler = acpi_scan_match_handler(hwid->id, NULL);
|
|
if (handler) {
|
|
adev->flags.hotplug_notify = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void acpi_device_dep_initialize(struct acpi_device *adev)
|
|
{
|
|
struct acpi_dep_data *dep;
|
|
struct acpi_handle_list dep_devices;
|
|
acpi_status status;
|
|
int i;
|
|
|
|
if (!acpi_has_method(adev->handle, "_DEP"))
|
|
return;
|
|
|
|
status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
|
|
&dep_devices);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < dep_devices.count; i++) {
|
|
struct acpi_device_info *info;
|
|
int skip;
|
|
|
|
status = acpi_get_object_info(dep_devices.handles[i], &info);
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_dbg(&adev->dev, "Error reading _DEP device info\n");
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Skip the dependency of Windows System Power
|
|
* Management Controller
|
|
*/
|
|
skip = info->valid & ACPI_VALID_HID &&
|
|
!strcmp(info->hardware_id.string, "INT3396");
|
|
|
|
kfree(info);
|
|
|
|
if (skip)
|
|
continue;
|
|
|
|
dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL);
|
|
if (!dep)
|
|
return;
|
|
|
|
dep->master = dep_devices.handles[i];
|
|
dep->slave = adev->handle;
|
|
adev->dep_unmet++;
|
|
|
|
mutex_lock(&acpi_dep_list_lock);
|
|
list_add_tail(&dep->node , &acpi_dep_list);
|
|
mutex_unlock(&acpi_dep_list_lock);
|
|
}
|
|
}
|
|
|
|
static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
|
|
void *not_used, void **return_value)
|
|
{
|
|
struct acpi_device *device = NULL;
|
|
int type;
|
|
unsigned long long sta;
|
|
int result;
|
|
|
|
acpi_bus_get_device(handle, &device);
|
|
if (device)
|
|
goto out;
|
|
|
|
result = acpi_bus_type_and_status(handle, &type, &sta);
|
|
if (result)
|
|
return AE_OK;
|
|
|
|
if (type == ACPI_BUS_TYPE_POWER) {
|
|
acpi_add_power_resource(handle);
|
|
return AE_OK;
|
|
}
|
|
|
|
acpi_add_single_object(&device, handle, type, sta);
|
|
if (!device)
|
|
return AE_CTRL_DEPTH;
|
|
|
|
acpi_scan_init_hotplug(device);
|
|
acpi_device_dep_initialize(device);
|
|
|
|
out:
|
|
if (!*return_value)
|
|
*return_value = device;
|
|
|
|
return AE_OK;
|
|
}
|
|
|
|
static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data)
|
|
{
|
|
bool *is_spi_i2c_slave_p = data;
|
|
|
|
if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
|
|
return 1;
|
|
|
|
/*
|
|
* devices that are connected to UART still need to be enumerated to
|
|
* platform bus
|
|
*/
|
|
if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART)
|
|
*is_spi_i2c_slave_p = true;
|
|
|
|
/* no need to do more checking */
|
|
return -1;
|
|
}
|
|
|
|
static void acpi_default_enumeration(struct acpi_device *device)
|
|
{
|
|
struct list_head resource_list;
|
|
bool is_spi_i2c_slave = false;
|
|
|
|
/*
|
|
* Do not enumerate SPI/I2C slaves as they will be enumerated by their
|
|
* respective parents.
|
|
*/
|
|
INIT_LIST_HEAD(&resource_list);
|
|
acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave,
|
|
&is_spi_i2c_slave);
|
|
acpi_dev_free_resource_list(&resource_list);
|
|
if (!is_spi_i2c_slave) {
|
|
acpi_create_platform_device(device, NULL);
|
|
acpi_device_set_enumerated(device);
|
|
} else {
|
|
blocking_notifier_call_chain(&acpi_reconfig_chain,
|
|
ACPI_RECONFIG_DEVICE_ADD, device);
|
|
}
|
|
}
|
|
|
|
static const struct acpi_device_id generic_device_ids[] = {
|
|
{ACPI_DT_NAMESPACE_HID, },
|
|
{"", },
|
|
};
|
|
|
|
static int acpi_generic_device_attach(struct acpi_device *adev,
|
|
const struct acpi_device_id *not_used)
|
|
{
|
|
/*
|
|
* Since ACPI_DT_NAMESPACE_HID is the only ID handled here, the test
|
|
* below can be unconditional.
|
|
*/
|
|
if (adev->data.of_compatible)
|
|
acpi_default_enumeration(adev);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static struct acpi_scan_handler generic_device_handler = {
|
|
.ids = generic_device_ids,
|
|
.attach = acpi_generic_device_attach,
|
|
};
|
|
|
|
static int acpi_scan_attach_handler(struct acpi_device *device)
|
|
{
|
|
struct acpi_hardware_id *hwid;
|
|
int ret = 0;
|
|
|
|
list_for_each_entry(hwid, &device->pnp.ids, list) {
|
|
const struct acpi_device_id *devid;
|
|
struct acpi_scan_handler *handler;
|
|
|
|
handler = acpi_scan_match_handler(hwid->id, &devid);
|
|
if (handler) {
|
|
if (!handler->attach) {
|
|
device->pnp.type.platform_id = 0;
|
|
continue;
|
|
}
|
|
device->handler = handler;
|
|
ret = handler->attach(device, devid);
|
|
if (ret > 0)
|
|
break;
|
|
|
|
device->handler = NULL;
|
|
if (ret < 0)
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void acpi_bus_attach(struct acpi_device *device)
|
|
{
|
|
struct acpi_device *child;
|
|
acpi_handle ejd;
|
|
int ret;
|
|
|
|
if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd)))
|
|
register_dock_dependent_device(device, ejd);
|
|
|
|
acpi_bus_get_status(device);
|
|
/* Skip devices that are not present. */
|
|
if (!acpi_device_is_present(device)) {
|
|
acpi_device_clear_enumerated(device);
|
|
device->flags.power_manageable = 0;
|
|
return;
|
|
}
|
|
if (device->handler)
|
|
goto ok;
|
|
|
|
if (!device->flags.initialized) {
|
|
device->flags.power_manageable =
|
|
device->power.states[ACPI_STATE_D0].flags.valid;
|
|
if (acpi_bus_init_power(device))
|
|
device->flags.power_manageable = 0;
|
|
|
|
device->flags.initialized = true;
|
|
}
|
|
|
|
ret = acpi_scan_attach_handler(device);
|
|
if (ret < 0)
|
|
return;
|
|
|
|
device->flags.match_driver = true;
|
|
if (!ret) {
|
|
ret = device_attach(&device->dev);
|
|
if (ret < 0)
|
|
return;
|
|
|
|
if (!ret && device->pnp.type.platform_id)
|
|
acpi_default_enumeration(device);
|
|
}
|
|
|
|
ok:
|
|
list_for_each_entry(child, &device->children, node)
|
|
acpi_bus_attach(child);
|
|
|
|
if (device->handler && device->handler->hotplug.notify_online)
|
|
device->handler->hotplug.notify_online(device);
|
|
}
|
|
|
|
void acpi_walk_dep_device_list(acpi_handle handle)
|
|
{
|
|
struct acpi_dep_data *dep, *tmp;
|
|
struct acpi_device *adev;
|
|
|
|
mutex_lock(&acpi_dep_list_lock);
|
|
list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) {
|
|
if (dep->master == handle) {
|
|
acpi_bus_get_device(dep->slave, &adev);
|
|
if (!adev)
|
|
continue;
|
|
|
|
adev->dep_unmet--;
|
|
if (!adev->dep_unmet)
|
|
acpi_bus_attach(adev);
|
|
list_del(&dep->node);
|
|
kfree(dep);
|
|
}
|
|
}
|
|
mutex_unlock(&acpi_dep_list_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list);
|
|
|
|
/**
|
|
* acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
|
|
* @handle: Root of the namespace scope to scan.
|
|
*
|
|
* Scan a given ACPI tree (probably recently hot-plugged) and create and add
|
|
* found devices.
|
|
*
|
|
* If no devices were found, -ENODEV is returned, but it does not mean that
|
|
* there has been a real error. There just have been no suitable ACPI objects
|
|
* in the table trunk from which the kernel could create a device and add an
|
|
* appropriate driver.
|
|
*
|
|
* Must be called under acpi_scan_lock.
|
|
*/
|
|
int acpi_bus_scan(acpi_handle handle)
|
|
{
|
|
void *device = NULL;
|
|
|
|
if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
|
|
acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
|
|
acpi_bus_check_add, NULL, NULL, &device);
|
|
|
|
if (device) {
|
|
acpi_bus_attach(device);
|
|
return 0;
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
EXPORT_SYMBOL(acpi_bus_scan);
|
|
|
|
/**
|
|
* acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects.
|
|
* @adev: Root of the ACPI namespace scope to walk.
|
|
*
|
|
* Must be called under acpi_scan_lock.
|
|
*/
|
|
void acpi_bus_trim(struct acpi_device *adev)
|
|
{
|
|
struct acpi_scan_handler *handler = adev->handler;
|
|
struct acpi_device *child;
|
|
|
|
list_for_each_entry_reverse(child, &adev->children, node)
|
|
acpi_bus_trim(child);
|
|
|
|
adev->flags.match_driver = false;
|
|
if (handler) {
|
|
if (handler->detach)
|
|
handler->detach(adev);
|
|
|
|
adev->handler = NULL;
|
|
} else {
|
|
device_release_driver(&adev->dev);
|
|
}
|
|
/*
|
|
* Most likely, the device is going away, so put it into D3cold before
|
|
* that.
|
|
*/
|
|
acpi_device_set_power(adev, ACPI_STATE_D3_COLD);
|
|
adev->flags.initialized = false;
|
|
acpi_device_clear_enumerated(adev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_bus_trim);
|
|
|
|
static int acpi_bus_scan_fixed(void)
|
|
{
|
|
int result = 0;
|
|
|
|
/*
|
|
* Enumerate all fixed-feature devices.
|
|
*/
|
|
if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
|
|
struct acpi_device *device = NULL;
|
|
|
|
result = acpi_add_single_object(&device, NULL,
|
|
ACPI_BUS_TYPE_POWER_BUTTON,
|
|
ACPI_STA_DEFAULT);
|
|
if (result)
|
|
return result;
|
|
|
|
device->flags.match_driver = true;
|
|
result = device_attach(&device->dev);
|
|
if (result < 0)
|
|
return result;
|
|
|
|
device_init_wakeup(&device->dev, true);
|
|
}
|
|
|
|
if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
|
|
struct acpi_device *device = NULL;
|
|
|
|
result = acpi_add_single_object(&device, NULL,
|
|
ACPI_BUS_TYPE_SLEEP_BUTTON,
|
|
ACPI_STA_DEFAULT);
|
|
if (result)
|
|
return result;
|
|
|
|
device->flags.match_driver = true;
|
|
result = device_attach(&device->dev);
|
|
}
|
|
|
|
return result < 0 ? result : 0;
|
|
}
|
|
|
|
static void __init acpi_get_spcr_uart_addr(void)
|
|
{
|
|
acpi_status status;
|
|
struct acpi_table_spcr *spcr_ptr;
|
|
|
|
status = acpi_get_table(ACPI_SIG_SPCR, 0,
|
|
(struct acpi_table_header **)&spcr_ptr);
|
|
if (ACPI_SUCCESS(status))
|
|
spcr_uart_addr = spcr_ptr->serial_port.address;
|
|
else
|
|
printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n");
|
|
}
|
|
|
|
static bool acpi_scan_initialized;
|
|
|
|
int __init acpi_scan_init(void)
|
|
{
|
|
int result;
|
|
acpi_status status;
|
|
struct acpi_table_stao *stao_ptr;
|
|
|
|
acpi_pci_root_init();
|
|
acpi_pci_link_init();
|
|
acpi_processor_init();
|
|
acpi_lpss_init();
|
|
acpi_apd_init();
|
|
acpi_cmos_rtc_init();
|
|
acpi_container_init();
|
|
acpi_memory_hotplug_init();
|
|
acpi_pnp_init();
|
|
acpi_int340x_thermal_init();
|
|
acpi_amba_init();
|
|
acpi_watchdog_init();
|
|
|
|
acpi_scan_add_handler(&generic_device_handler);
|
|
|
|
/*
|
|
* If there is STAO table, check whether it needs to ignore the UART
|
|
* device in SPCR table.
|
|
*/
|
|
status = acpi_get_table(ACPI_SIG_STAO, 0,
|
|
(struct acpi_table_header **)&stao_ptr);
|
|
if (ACPI_SUCCESS(status)) {
|
|
if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
|
|
printk(KERN_INFO PREFIX "STAO Name List not yet supported.");
|
|
|
|
if (stao_ptr->ignore_uart)
|
|
acpi_get_spcr_uart_addr();
|
|
}
|
|
|
|
mutex_lock(&acpi_scan_lock);
|
|
/*
|
|
* Enumerate devices in the ACPI namespace.
|
|
*/
|
|
result = acpi_bus_scan(ACPI_ROOT_OBJECT);
|
|
if (result)
|
|
goto out;
|
|
|
|
result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
|
|
if (result)
|
|
goto out;
|
|
|
|
/* Fixed feature devices do not exist on HW-reduced platform */
|
|
if (!acpi_gbl_reduced_hardware) {
|
|
result = acpi_bus_scan_fixed();
|
|
if (result) {
|
|
acpi_detach_data(acpi_root->handle,
|
|
acpi_scan_drop_device);
|
|
acpi_device_del(acpi_root);
|
|
put_device(&acpi_root->dev);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
acpi_gpe_apply_masked_gpes();
|
|
acpi_update_all_gpes();
|
|
acpi_ec_ecdt_start();
|
|
|
|
acpi_scan_initialized = true;
|
|
|
|
out:
|
|
mutex_unlock(&acpi_scan_lock);
|
|
return result;
|
|
}
|
|
|
|
static struct acpi_probe_entry *ape;
|
|
static int acpi_probe_count;
|
|
static DEFINE_MUTEX(acpi_probe_mutex);
|
|
|
|
static int __init acpi_match_madt(struct acpi_subtable_header *header,
|
|
const unsigned long end)
|
|
{
|
|
if (!ape->subtable_valid || ape->subtable_valid(header, ape))
|
|
if (!ape->probe_subtbl(header, end))
|
|
acpi_probe_count++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __init __acpi_probe_device_table(struct acpi_probe_entry *ap_head, int nr)
|
|
{
|
|
int count = 0;
|
|
|
|
if (acpi_disabled)
|
|
return 0;
|
|
|
|
mutex_lock(&acpi_probe_mutex);
|
|
for (ape = ap_head; nr; ape++, nr--) {
|
|
if (ACPI_COMPARE_NAME(ACPI_SIG_MADT, ape->id)) {
|
|
acpi_probe_count = 0;
|
|
acpi_table_parse_madt(ape->type, acpi_match_madt, 0);
|
|
count += acpi_probe_count;
|
|
} else {
|
|
int res;
|
|
res = acpi_table_parse(ape->id, ape->probe_table);
|
|
if (!res)
|
|
count++;
|
|
}
|
|
}
|
|
mutex_unlock(&acpi_probe_mutex);
|
|
|
|
return count;
|
|
}
|
|
|
|
struct acpi_table_events_work {
|
|
struct work_struct work;
|
|
void *table;
|
|
u32 event;
|
|
};
|
|
|
|
static void acpi_table_events_fn(struct work_struct *work)
|
|
{
|
|
struct acpi_table_events_work *tew;
|
|
|
|
tew = container_of(work, struct acpi_table_events_work, work);
|
|
|
|
if (tew->event == ACPI_TABLE_EVENT_LOAD) {
|
|
acpi_scan_lock_acquire();
|
|
acpi_bus_scan(ACPI_ROOT_OBJECT);
|
|
acpi_scan_lock_release();
|
|
}
|
|
|
|
kfree(tew);
|
|
}
|
|
|
|
void acpi_scan_table_handler(u32 event, void *table, void *context)
|
|
{
|
|
struct acpi_table_events_work *tew;
|
|
|
|
if (!acpi_scan_initialized)
|
|
return;
|
|
|
|
if (event != ACPI_TABLE_EVENT_LOAD)
|
|
return;
|
|
|
|
tew = kmalloc(sizeof(*tew), GFP_KERNEL);
|
|
if (!tew)
|
|
return;
|
|
|
|
INIT_WORK(&tew->work, acpi_table_events_fn);
|
|
tew->table = table;
|
|
tew->event = event;
|
|
|
|
schedule_work(&tew->work);
|
|
}
|
|
|
|
int acpi_reconfig_notifier_register(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_register(&acpi_reconfig_chain, nb);
|
|
}
|
|
EXPORT_SYMBOL(acpi_reconfig_notifier_register);
|
|
|
|
int acpi_reconfig_notifier_unregister(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_unregister(&acpi_reconfig_chain, nb);
|
|
}
|
|
EXPORT_SYMBOL(acpi_reconfig_notifier_unregister);
|