swh:1:snp:49cd9498d6cccc5e78252c27dcb645bcf7bf0c91
Tip revision: 672c0c5173427e6b3e2a9bbb7be51ceeec78093a authored by Linus Torvalds on 01 May 2022, 20:57:58 UTC
Linux 5.18-rc5
Linux 5.18-rc5
Tip revision: 672c0c5
usb-acpi.c
// SPDX-License-Identifier: GPL-2.0
/*
* USB-ACPI glue code
*
* Copyright 2012 Red Hat <mjg@redhat.com>
*/
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/pci.h>
#include <linux/usb/hcd.h>
#include "hub.h"
/**
* usb_acpi_power_manageable - check whether usb port has
* acpi power resource.
* @hdev: USB device belonging to the usb hub
* @index: port index based zero
*
* Return true if the port has acpi power resource and false if no.
*/
bool usb_acpi_power_manageable(struct usb_device *hdev, int index)
{
acpi_handle port_handle;
int port1 = index + 1;
port_handle = usb_get_hub_port_acpi_handle(hdev,
port1);
if (port_handle)
return acpi_bus_power_manageable(port_handle);
else
return false;
}
EXPORT_SYMBOL_GPL(usb_acpi_power_manageable);
/**
* usb_acpi_set_power_state - control usb port's power via acpi power
* resource
* @hdev: USB device belonging to the usb hub
* @index: port index based zero
* @enable: power state expected to be set
*
* Notice to use usb_acpi_power_manageable() to check whether the usb port
* has acpi power resource before invoking this function.
*
* Returns 0 on success, else negative errno.
*/
int usb_acpi_set_power_state(struct usb_device *hdev, int index, bool enable)
{
struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
struct usb_port *port_dev;
acpi_handle port_handle;
unsigned char state;
int port1 = index + 1;
int error = -EINVAL;
if (!hub)
return -ENODEV;
port_dev = hub->ports[port1 - 1];
port_handle = (acpi_handle) usb_get_hub_port_acpi_handle(hdev, port1);
if (!port_handle)
return error;
if (enable)
state = ACPI_STATE_D0;
else
state = ACPI_STATE_D3_COLD;
error = acpi_bus_set_power(port_handle, state);
if (!error)
dev_dbg(&port_dev->dev, "acpi: power was set to %d\n", enable);
else
dev_dbg(&port_dev->dev, "acpi: power failed to be set\n");
return error;
}
EXPORT_SYMBOL_GPL(usb_acpi_set_power_state);
static enum usb_port_connect_type usb_acpi_get_connect_type(acpi_handle handle,
struct acpi_pld_info *pld)
{
enum usb_port_connect_type connect_type = USB_PORT_CONNECT_TYPE_UNKNOWN;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *upc = NULL;
acpi_status status;
/*
* According to 9.14 in ACPI Spec 6.2. _PLD indicates whether usb port
* is user visible and _UPC indicates whether it is connectable. If
* the port was visible and connectable, it could be freely connected
* and disconnected with USB devices. If no visible and connectable,
* a usb device is directly hard-wired to the port. If no visible and
* no connectable, the port would be not used.
*/
status = acpi_evaluate_object(handle, "_UPC", NULL, &buffer);
if (ACPI_FAILURE(status))
goto out;
upc = buffer.pointer;
if (!upc || (upc->type != ACPI_TYPE_PACKAGE) || upc->package.count != 4)
goto out;
if (upc->package.elements[0].integer.value)
if (pld->user_visible)
connect_type = USB_PORT_CONNECT_TYPE_HOT_PLUG;
else
connect_type = USB_PORT_CONNECT_TYPE_HARD_WIRED;
else if (!pld->user_visible)
connect_type = USB_PORT_NOT_USED;
out:
kfree(upc);
return connect_type;
}
/*
* Private to usb-acpi, all the core needs to know is that
* port_dev->location is non-zero when it has been set by the firmware.
*/
#define USB_ACPI_LOCATION_VALID (1 << 31)
static struct acpi_device *usb_acpi_find_port(struct acpi_device *parent,
int raw)
{
struct acpi_device *adev;
if (!parent)
return NULL;
list_for_each_entry(adev, &parent->children, node) {
if (acpi_device_adr(adev) == raw)
return adev;
}
return acpi_find_child_device(parent, raw, false);
}
static struct acpi_device *
usb_acpi_get_companion_for_port(struct usb_port *port_dev)
{
struct usb_device *udev;
struct acpi_device *adev;
acpi_handle *parent_handle;
int port1;
/* Get the struct usb_device point of port's hub */
udev = to_usb_device(port_dev->dev.parent->parent);
/*
* The root hub ports' parent is the root hub. The non-root-hub
* ports' parent is the parent hub port which the hub is
* connected to.
*/
if (!udev->parent) {
adev = ACPI_COMPANION(&udev->dev);
port1 = usb_hcd_find_raw_port_number(bus_to_hcd(udev->bus),
port_dev->portnum);
} else {
parent_handle = usb_get_hub_port_acpi_handle(udev->parent,
udev->portnum);
if (!parent_handle)
return NULL;
adev = acpi_fetch_acpi_dev(parent_handle);
port1 = port_dev->portnum;
}
return usb_acpi_find_port(adev, port1);
}
static struct acpi_device *
usb_acpi_find_companion_for_port(struct usb_port *port_dev)
{
struct acpi_device *adev;
struct acpi_pld_info *pld;
acpi_handle *handle;
acpi_status status;
adev = usb_acpi_get_companion_for_port(port_dev);
if (!adev)
return NULL;
handle = adev->handle;
status = acpi_get_physical_device_location(handle, &pld);
if (ACPI_SUCCESS(status) && pld) {
port_dev->location = USB_ACPI_LOCATION_VALID
| pld->group_token << 8 | pld->group_position;
port_dev->connect_type = usb_acpi_get_connect_type(handle, pld);
ACPI_FREE(pld);
}
return adev;
}
static struct acpi_device *
usb_acpi_find_companion_for_device(struct usb_device *udev)
{
struct acpi_device *adev;
struct usb_port *port_dev;
struct usb_hub *hub;
if (!udev->parent) {
/* root hub is only child (_ADR=0) under its parent, the HC */
adev = ACPI_COMPANION(udev->dev.parent);
return acpi_find_child_device(adev, 0, false);
}
hub = usb_hub_to_struct_hub(udev->parent);
if (!hub)
return NULL;
/*
* This is an embedded USB device connected to a port and such
* devices share port's ACPI companion.
*/
port_dev = hub->ports[udev->portnum - 1];
return usb_acpi_get_companion_for_port(port_dev);
}
static struct acpi_device *usb_acpi_find_companion(struct device *dev)
{
/*
* The USB hierarchy like following:
*
* Device (EHC1)
* Device (HUBN)
* Device (PR01)
* Device (PR11)
* Device (PR12)
* Device (FN12)
* Device (FN13)
* Device (PR13)
* ...
* where HUBN is root hub, and PRNN are USB ports and devices
* connected to them, and FNNN are individualk functions for
* connected composite USB devices. PRNN and FNNN may contain
* _CRS and other methods describing sideband resources for
* the connected device.
*
* On the kernel side both root hub and embedded USB devices are
* represented as instances of usb_device structure, and ports
* are represented as usb_port structures, so the whole process
* is split into 2 parts: finding companions for devices and
* finding companions for ports.
*
* Note that we do not handle individual functions of composite
* devices yet, for that we would need to assign companions to
* devices corresponding to USB interfaces.
*/
if (is_usb_device(dev))
return usb_acpi_find_companion_for_device(to_usb_device(dev));
else if (is_usb_port(dev))
return usb_acpi_find_companion_for_port(to_usb_port(dev));
return NULL;
}
static bool usb_acpi_bus_match(struct device *dev)
{
return is_usb_device(dev) || is_usb_port(dev);
}
static struct acpi_bus_type usb_acpi_bus = {
.name = "USB",
.match = usb_acpi_bus_match,
.find_companion = usb_acpi_find_companion,
};
int usb_acpi_register(void)
{
return register_acpi_bus_type(&usb_acpi_bus);
}
void usb_acpi_unregister(void)
{
unregister_acpi_bus_type(&usb_acpi_bus);
}