d557542421
In the ACPI DSDT table, only usb root hub and usb ports are ACPI device nodes. Originally, we bound the usb port's ACPI node to the usb device attached to the port. However, we want to access those ACPI port methods when the port is empty, and there's no usb_device associated with that port. Now that the usb port is a real device, we can bind the port's ACPI node to struct usb_port instead. Signed-off-by: Lan Tianyu <tianyu.lan@intel.com> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
155 lines
3.5 KiB
C
155 lines
3.5 KiB
C
/*
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* USB-ACPI glue code
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*
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* Copyright 2012 Red Hat <mjg@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation, version 2.
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*
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*/
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/acpi.h>
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#include <linux/pci.h>
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#include <acpi/acpi_bus.h>
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#include "usb.h"
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static int usb_acpi_check_upc(struct usb_device *udev, acpi_handle handle)
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{
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acpi_status status;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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union acpi_object *upc;
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int ret = 0;
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status = acpi_evaluate_object(handle, "_UPC", NULL, &buffer);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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upc = buffer.pointer;
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if (!upc || (upc->type != ACPI_TYPE_PACKAGE)
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|| upc->package.count != 4) {
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ret = -EINVAL;
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goto out;
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}
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if (upc->package.elements[0].integer.value)
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udev->removable = USB_DEVICE_REMOVABLE;
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else
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udev->removable = USB_DEVICE_FIXED;
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out:
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kfree(upc);
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return ret;
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}
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static int usb_acpi_check_pld(struct usb_device *udev, acpi_handle handle)
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{
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acpi_status status;
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struct acpi_pld pld;
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status = acpi_get_physical_device_location(handle, &pld);
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if (ACPI_FAILURE(status))
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return -ENODEV;
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if (pld.user_visible)
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udev->removable = USB_DEVICE_REMOVABLE;
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else
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udev->removable = USB_DEVICE_FIXED;
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return 0;
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}
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static int usb_acpi_find_device(struct device *dev, acpi_handle *handle)
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{
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struct usb_device *udev;
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acpi_handle *parent_handle;
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int port_num;
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/*
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* In the ACPI DSDT table, only usb root hub and usb ports are
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* acpi device nodes. The hierarchy like following.
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* Device (EHC1)
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* Device (HUBN)
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* Device (PR01)
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* Device (PR11)
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* Device (PR12)
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* Device (PR13)
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* ...
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* So all binding process is divided into two parts. binding
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* root hub and usb ports.
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*/
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if (is_usb_device(dev)) {
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udev = to_usb_device(dev);
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if (udev->parent)
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return -ENODEV;
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/* root hub's parent is the usb hcd. */
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parent_handle = DEVICE_ACPI_HANDLE(dev->parent);
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*handle = acpi_get_child(parent_handle, udev->portnum);
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if (!*handle)
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return -ENODEV;
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return 0;
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} else if (is_usb_port(dev)) {
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sscanf(dev_name(dev), "port%d", &port_num);
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/* Get the struct usb_device point of port's hub */
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udev = to_usb_device(dev->parent->parent);
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/*
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* The root hub ports' parent is the root hub. The non-root-hub
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* ports' parent is the parent hub port which the hub is
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* connected to.
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*/
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if (!udev->parent) {
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*handle = acpi_get_child(DEVICE_ACPI_HANDLE(&udev->dev),
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port_num);
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if (!*handle)
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return -ENODEV;
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} else {
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parent_handle =
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usb_get_hub_port_acpi_handle(udev->parent,
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udev->portnum);
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if (!parent_handle)
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return -ENODEV;
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*handle = acpi_get_child(parent_handle, port_num);
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if (!*handle)
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return -ENODEV;
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}
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} else
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return -ENODEV;
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/*
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* PLD will tell us whether a port is removable to the user or
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* not. If we don't get an answer from PLD (it's not present
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* or it's malformed) then try to infer it from UPC. If a
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* device isn't connectable then it's probably not removable.
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*/
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if (usb_acpi_check_pld(udev, *handle) != 0)
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usb_acpi_check_upc(udev, *handle);
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return 0;
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}
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static struct acpi_bus_type usb_acpi_bus = {
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.bus = &usb_bus_type,
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.find_bridge = usb_acpi_find_device,
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.find_device = usb_acpi_find_device,
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};
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int usb_acpi_register(void)
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{
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return register_acpi_bus_type(&usb_acpi_bus);
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}
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void usb_acpi_unregister(void)
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{
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unregister_acpi_bus_type(&usb_acpi_bus);
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}
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