linux/drivers/usb/core/usb-acpi.c
Lan Tianyu bafcaf6d84 usb/acpi: binding xhci root hub usb port with ACPI
This patch is to bind xhci root hub usb port with its acpi node.
The port num in the acpi table matches with the sequence in the xhci
extended capabilities table. So call usb_hcd_find_raw_port_number() to
transfer hub port num into raw port number which associates with
the sequence in the xhci extended capabilities table before binding.

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
2013-03-25 10:39:17 -07:00

239 lines
5.9 KiB
C

/*
* USB-ACPI glue code
*
* Copyright 2012 Red Hat <mjg@redhat.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation, version 2.
*
*/
#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 <acpi/acpi_bus.h>
#include "usb.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)
{
acpi_handle port_handle;
unsigned char state;
int port1 = index + 1;
int error = -EINVAL;
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(&hdev->dev, "The power of hub port %d was set to %d\n",
port1, enable);
else
dev_dbg(&hdev->dev, "The power of hub port failed to be set\n");
return error;
}
EXPORT_SYMBOL_GPL(usb_acpi_set_power_state);
static int usb_acpi_check_port_connect_type(struct usb_device *hdev,
acpi_handle handle, int port1)
{
acpi_status status;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *upc;
struct acpi_pld_info *pld;
int ret = 0;
/*
* Accoding to ACPI Spec 9.13. 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_get_physical_device_location(handle, &pld);
if (ACPI_FAILURE(status))
return -ENODEV;
status = acpi_evaluate_object(handle, "_UPC", NULL, &buffer);
upc = buffer.pointer;
if (!upc || (upc->type != ACPI_TYPE_PACKAGE)
|| upc->package.count != 4) {
ret = -EINVAL;
goto out;
}
if (upc->package.elements[0].integer.value)
if (pld->user_visible)
usb_set_hub_port_connect_type(hdev, port1,
USB_PORT_CONNECT_TYPE_HOT_PLUG);
else
usb_set_hub_port_connect_type(hdev, port1,
USB_PORT_CONNECT_TYPE_HARD_WIRED);
else if (!pld->user_visible)
usb_set_hub_port_connect_type(hdev, port1, USB_PORT_NOT_USED);
out:
ACPI_FREE(pld);
kfree(upc);
return ret;
}
static int usb_acpi_find_device(struct device *dev, acpi_handle *handle)
{
struct usb_device *udev;
acpi_handle *parent_handle;
int port_num;
/*
* In the ACPI DSDT table, only usb root hub and usb ports are
* acpi device nodes. The hierarchy like following.
* Device (EHC1)
* Device (HUBN)
* Device (PR01)
* Device (PR11)
* Device (PR12)
* Device (PR13)
* ...
* So all binding process is divided into two parts. binding
* root hub and usb ports.
*/
if (is_usb_device(dev)) {
udev = to_usb_device(dev);
if (udev->parent) {
enum usb_port_connect_type type;
/*
* According usb port's connect type to set usb device's
* removability.
*/
type = usb_get_hub_port_connect_type(udev->parent,
udev->portnum);
switch (type) {
case USB_PORT_CONNECT_TYPE_HOT_PLUG:
udev->removable = USB_DEVICE_REMOVABLE;
break;
case USB_PORT_CONNECT_TYPE_HARD_WIRED:
udev->removable = USB_DEVICE_FIXED;
break;
default:
udev->removable = USB_DEVICE_REMOVABLE_UNKNOWN;
break;
}
return -ENODEV;
}
/* root hub's parent is the usb hcd. */
parent_handle = DEVICE_ACPI_HANDLE(dev->parent);
*handle = acpi_get_child(parent_handle, udev->portnum);
if (!*handle)
return -ENODEV;
return 0;
} else if (is_usb_port(dev)) {
sscanf(dev_name(dev), "port%d", &port_num);
/* Get the struct usb_device point of port's hub */
udev = to_usb_device(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) {
struct usb_hcd *hcd = bus_to_hcd(udev->bus);
int raw_port_num;
raw_port_num = usb_hcd_find_raw_port_number(hcd,
port_num);
*handle = acpi_get_child(DEVICE_ACPI_HANDLE(&udev->dev),
raw_port_num);
if (!*handle)
return -ENODEV;
} else {
parent_handle =
usb_get_hub_port_acpi_handle(udev->parent,
udev->portnum);
if (!parent_handle)
return -ENODEV;
*handle = acpi_get_child(parent_handle, port_num);
if (!*handle)
return -ENODEV;
}
usb_acpi_check_port_connect_type(udev, *handle, port_num);
} else
return -ENODEV;
return 0;
}
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_device = usb_acpi_find_device,
};
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);
}