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audk/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbEnumer.c

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/** @file
Usb bus enumeration support.
Copyright (c) 2007 - 2012, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "UsbBus.h"
/**
Return the endpoint descriptor in this interface.
@param UsbIf The interface to search in.
@param EpAddr The address of the endpoint to return.
@return The endpoint descriptor or NULL.
**/
USB_ENDPOINT_DESC *
UsbGetEndpointDesc (
IN USB_INTERFACE *UsbIf,
IN UINT8 EpAddr
)
{
USB_ENDPOINT_DESC *EpDesc;
UINT8 Index;
UINT8 NumEndpoints;
NumEndpoints = UsbIf->IfSetting->Desc.NumEndpoints;
for (Index = 0; Index < NumEndpoints; Index++) {
EpDesc = UsbIf->IfSetting->Endpoints[Index];
if (EpDesc->Desc.EndpointAddress == EpAddr) {
return EpDesc;
}
}
return NULL;
}
/**
Free the resource used by USB interface.
@param UsbIf The USB interface to free.
**/
VOID
UsbFreeInterface (
IN USB_INTERFACE *UsbIf
)
{
UsbCloseHostProtoByChild (UsbIf->Device->Bus, UsbIf->Handle);
gBS->UninstallMultipleProtocolInterfaces (
UsbIf->Handle,
&gEfiDevicePathProtocolGuid,
UsbIf->DevicePath,
&gEfiUsbIoProtocolGuid,
&UsbIf->UsbIo,
NULL
);
if (UsbIf->DevicePath != NULL) {
FreePool (UsbIf->DevicePath);
}
FreePool (UsbIf);
}
/**
Create an interface for the descriptor IfDesc. Each
device's configuration can have several interfaces.
@param Device The device has the interface descriptor.
@param IfDesc The interface descriptor.
@return The created USB interface for the descriptor, or NULL.
**/
USB_INTERFACE *
UsbCreateInterface (
IN USB_DEVICE *Device,
IN USB_INTERFACE_DESC *IfDesc
)
{
USB_DEVICE_PATH UsbNode;
USB_INTERFACE *UsbIf;
USB_INTERFACE *HubIf;
EFI_STATUS Status;
UsbIf = AllocateZeroPool (sizeof (USB_INTERFACE));
if (UsbIf == NULL) {
return NULL;
}
UsbIf->Signature = USB_INTERFACE_SIGNATURE;
UsbIf->Device = Device;
UsbIf->IfDesc = IfDesc;
ASSERT (IfDesc->ActiveIndex < USB_MAX_INTERFACE_SETTING);
UsbIf->IfSetting = IfDesc->Settings[IfDesc->ActiveIndex];
CopyMem (
&(UsbIf->UsbIo),
&mUsbIoProtocol,
sizeof (EFI_USB_IO_PROTOCOL)
);
//
// Install protocols for USBIO and device path
//
UsbNode.Header.Type = MESSAGING_DEVICE_PATH;
UsbNode.Header.SubType = MSG_USB_DP;
UsbNode.ParentPortNumber = Device->ParentPort;
UsbNode.InterfaceNumber = UsbIf->IfSetting->Desc.InterfaceNumber;
SetDevicePathNodeLength (&UsbNode.Header, sizeof (UsbNode));
HubIf = Device->ParentIf;
ASSERT (HubIf != NULL);
UsbIf->DevicePath = AppendDevicePathNode (HubIf->DevicePath, &UsbNode.Header);
if (UsbIf->DevicePath == NULL) {
DEBUG ((EFI_D_ERROR, "UsbCreateInterface: failed to create device path\n"));
Status = EFI_OUT_OF_RESOURCES;
goto ON_ERROR;
}
Status = gBS->InstallMultipleProtocolInterfaces (
&UsbIf->Handle,
&gEfiDevicePathProtocolGuid,
UsbIf->DevicePath,
&gEfiUsbIoProtocolGuid,
&UsbIf->UsbIo,
NULL
);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "UsbCreateInterface: failed to install UsbIo - %r\n", Status));
goto ON_ERROR;
}
//
// Open USB Host Controller Protocol by Child
//
Status = UsbOpenHostProtoByChild (Device->Bus, UsbIf->Handle);
if (EFI_ERROR (Status)) {
gBS->UninstallMultipleProtocolInterfaces (
&UsbIf->Handle,
&gEfiDevicePathProtocolGuid,
UsbIf->DevicePath,
&gEfiUsbIoProtocolGuid,
&UsbIf->UsbIo,
NULL
);
DEBUG ((EFI_D_ERROR, "UsbCreateInterface: failed to open host for child - %r\n", Status));
goto ON_ERROR;
}
return UsbIf;
ON_ERROR:
if (UsbIf->DevicePath != NULL) {
FreePool (UsbIf->DevicePath);
}
FreePool (UsbIf);
return NULL;
}
/**
Free the resource used by this USB device.
@param Device The USB device to free.
**/
VOID
UsbFreeDevice (
IN USB_DEVICE *Device
)
{
if (Device->DevDesc != NULL) {
UsbFreeDevDesc (Device->DevDesc);
}
gBS->FreePool (Device);
}
/**
Create a device which is on the parent's ParentPort port.
@param ParentIf The parent HUB interface.
@param ParentPort The port on the HUB this device is connected to.
@return Created USB device, Or NULL.
**/
USB_DEVICE *
UsbCreateDevice (
IN USB_INTERFACE *ParentIf,
IN UINT8 ParentPort
)
{
USB_DEVICE *Device;
ASSERT (ParentIf != NULL);
Device = AllocateZeroPool (sizeof (USB_DEVICE));
if (Device == NULL) {
return NULL;
}
Device->Bus = ParentIf->Device->Bus;
Device->MaxPacket0 = 8;
Device->ParentAddr = ParentIf->Device->Address;
Device->ParentIf = ParentIf;
Device->ParentPort = ParentPort;
Device->Tier = (UINT8)(ParentIf->Device->Tier + 1);
return Device;
}
/**
Connect the USB interface with its driver. EFI USB bus will
create a USB interface for each separate interface descriptor.
@param UsbIf The interface to connect driver to.
@return EFI_SUCCESS Interface is managed by some driver.
@return Others Failed to locate a driver for this interface.
**/
EFI_STATUS
UsbConnectDriver (
IN USB_INTERFACE *UsbIf
)
{
EFI_STATUS Status;
EFI_TPL OldTpl;
Status = EFI_SUCCESS;
//
// Hub is maintained by the USB bus driver. Otherwise try to
// connect drivers with this interface
//
if (UsbIsHubInterface (UsbIf)) {
DEBUG ((EFI_D_INFO, "UsbConnectDriver: found a hub device\n"));
Status = mUsbHubApi.Init (UsbIf);
} else {
//
// This function is called in both UsbIoControlTransfer and
// the timer callback in hub enumeration. So, at least it is
// called at TPL_CALLBACK. Some driver sitting on USB has
// twisted TPL used. It should be no problem for us to connect
// or disconnect at CALLBACK.
//
//
// Only recursively wanted usb child device
//
if (UsbBusIsWantedUsbIO (UsbIf->Device->Bus, UsbIf)) {
OldTpl = UsbGetCurrentTpl ();
DEBUG ((EFI_D_INFO, "UsbConnectDriver: TPL before connect is %d, %p\n", (UINT32)OldTpl, UsbIf->Handle));
gBS->RestoreTPL (TPL_CALLBACK);
Status = gBS->ConnectController (UsbIf->Handle, NULL, NULL, TRUE);
UsbIf->IsManaged = (BOOLEAN)!EFI_ERROR (Status);
DEBUG ((EFI_D_INFO, "UsbConnectDriver: TPL after connect is %d\n", (UINT32)UsbGetCurrentTpl()));
ASSERT (UsbGetCurrentTpl () == TPL_CALLBACK);
gBS->RaiseTPL (OldTpl);
}
}
return Status;
}
/**
Select an alternate setting for the interface.
Each interface can have several mutually exclusive
settings. Only one setting is active. It will
also reset its endpoints' toggle to zero.
@param IfDesc The interface descriptor to set.
@param Alternate The alternate setting number to locate.
@retval EFI_NOT_FOUND There is no setting with this alternate index.
@retval EFI_SUCCESS The interface is set to Alternate setting.
**/
EFI_STATUS
UsbSelectSetting (
IN USB_INTERFACE_DESC *IfDesc,
IN UINT8 Alternate
)
{
USB_INTERFACE_SETTING *Setting;
UINT8 Index;
//
// Locate the active alternate setting
//
Setting = NULL;
for (Index = 0; Index < IfDesc->NumOfSetting; Index++) {
ASSERT (Index < USB_MAX_INTERFACE_SETTING);
Setting = IfDesc->Settings[Index];
if (Setting->Desc.AlternateSetting == Alternate) {
break;
}
}
if (Index == IfDesc->NumOfSetting) {
return EFI_NOT_FOUND;
}
IfDesc->ActiveIndex = Index;
ASSERT (Setting != NULL);
DEBUG ((EFI_D_INFO, "UsbSelectSetting: setting %d selected for interface %d\n",
Alternate, Setting->Desc.InterfaceNumber));
//
// Reset the endpoint toggle to zero
//
for (Index = 0; Index < Setting->Desc.NumEndpoints; Index++) {
Setting->Endpoints[Index]->Toggle = 0;
}
return EFI_SUCCESS;
}
/**
Select a new configuration for the device. Each
device may support several configurations.
@param Device The device to select configuration.
@param ConfigValue The index of the configuration ( != 0).
@retval EFI_NOT_FOUND There is no configuration with the index.
@retval EFI_OUT_OF_RESOURCES Failed to allocate resource.
@retval EFI_SUCCESS The configuration is selected.
**/
EFI_STATUS
UsbSelectConfig (
IN USB_DEVICE *Device,
IN UINT8 ConfigValue
)
{
USB_DEVICE_DESC *DevDesc;
USB_CONFIG_DESC *ConfigDesc;
USB_INTERFACE_DESC *IfDesc;
USB_INTERFACE *UsbIf;
EFI_STATUS Status;
UINT8 Index;
//
// Locate the active config, then set the device's pointer
//
DevDesc = Device->DevDesc;
ConfigDesc = NULL;
for (Index = 0; Index < DevDesc->Desc.NumConfigurations; Index++) {
ConfigDesc = DevDesc->Configs[Index];
if (ConfigDesc->Desc.ConfigurationValue == ConfigValue) {
break;
}
}
if (Index == DevDesc->Desc.NumConfigurations) {
return EFI_NOT_FOUND;
}
Device->ActiveConfig = ConfigDesc;
DEBUG ((EFI_D_INFO, "UsbSelectConfig: config %d selected for device %d\n",
ConfigValue, Device->Address));
//
// Create interfaces for each USB interface descriptor.
//
for (Index = 0; Index < ConfigDesc->Desc.NumInterfaces; Index++) {
//
// First select the default interface setting, and reset
// the endpoint toggles to zero for its endpoints.
//
IfDesc = ConfigDesc->Interfaces[Index];
UsbSelectSetting (IfDesc, IfDesc->Settings[0]->Desc.AlternateSetting);
//
// Create a USB_INTERFACE and install USB_IO and other protocols
//
UsbIf = UsbCreateInterface (Device, ConfigDesc->Interfaces[Index]);
if (UsbIf == NULL) {
return EFI_OUT_OF_RESOURCES;
}
ASSERT (Index < USB_MAX_INTERFACE);
Device->Interfaces[Index] = UsbIf;
//
// Connect the device to drivers, if it failed, ignore
// the error. Don't let the unsupported interfaces to block
// the supported interfaces.
//
Status = UsbConnectDriver (UsbIf);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "UsbSelectConfig: failed to connect driver %r, ignored\n", Status));
}
}
Device->NumOfInterface = Index;
return EFI_SUCCESS;
}
/**
Disconnect the USB interface with its driver.
@param UsbIf The interface to disconnect driver from.
**/
VOID
UsbDisconnectDriver (
IN USB_INTERFACE *UsbIf
)
{
EFI_TPL OldTpl;
EFI_STATUS Status;
//
// Release the hub if it's a hub controller, otherwise
// disconnect the driver if it is managed by other drivers.
//
if (UsbIf->IsHub) {
UsbIf->HubApi->Release (UsbIf);
} else if (UsbIf->IsManaged) {
//
// This function is called in both UsbIoControlTransfer and
// the timer callback in hub enumeration. So, at least it is
// called at TPL_CALLBACK. Some driver sitting on USB has
// twisted TPL used. It should be no problem for us to connect
// or disconnect at CALLBACK.
//
OldTpl = UsbGetCurrentTpl ();
DEBUG ((EFI_D_INFO, "UsbDisconnectDriver: old TPL is %d, %p\n", (UINT32)OldTpl, UsbIf->Handle));
gBS->RestoreTPL (TPL_CALLBACK);
Status = gBS->DisconnectController (UsbIf->Handle, NULL, NULL);
UsbIf->IsManaged = FALSE;
DEBUG (( EFI_D_INFO, "UsbDisconnectDriver: TPL after disconnect is %d, %d\n", (UINT32)UsbGetCurrentTpl(), Status));
ASSERT (UsbGetCurrentTpl () == TPL_CALLBACK);
gBS->RaiseTPL (OldTpl);
}
}
/**
Remove the current device configuration.
@param Device The USB device to remove configuration from.
**/
VOID
UsbRemoveConfig (
IN USB_DEVICE *Device
)
{
USB_INTERFACE *UsbIf;
UINTN Index;
//
// Remove each interface of the device
//
for (Index = 0; Index < Device->NumOfInterface; Index++) {
ASSERT (Index < USB_MAX_INTERFACE);
UsbIf = Device->Interfaces[Index];
if (UsbIf == NULL) {
continue;
}
UsbDisconnectDriver (UsbIf);
UsbFreeInterface (UsbIf);
Device->Interfaces[Index] = NULL;
}
Device->ActiveConfig = NULL;
Device->NumOfInterface = 0;
}
/**
Remove the device and all its children from the bus.
@param Device The device to remove.
@retval EFI_SUCCESS The device is removed.
**/
EFI_STATUS
UsbRemoveDevice (
IN USB_DEVICE *Device
)
{
USB_BUS *Bus;
USB_DEVICE *Child;
EFI_STATUS Status;
UINTN Index;
Bus = Device->Bus;
//
// Remove all the devices on its downstream ports. Search from devices[1].
// Devices[0] is the root hub.
//
for (Index = 1; Index < Bus->MaxDevices; Index++) {
Child = Bus->Devices[Index];
if ((Child == NULL) || (Child->ParentAddr != Device->Address)) {
continue;
}
Status = UsbRemoveDevice (Child);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "UsbRemoveDevice: failed to remove child, ignore error\n"));
Bus->Devices[Index] = NULL;
}
}
UsbRemoveConfig (Device);
DEBUG (( EFI_D_INFO, "UsbRemoveDevice: device %d removed\n", Device->Address));
ASSERT (Device->Address < Bus->MaxDevices);
Bus->Devices[Device->Address] = NULL;
UsbFreeDevice (Device);
return EFI_SUCCESS;
}
/**
Find the child device on the hub's port.
@param HubIf The hub interface.
@param Port The port of the hub this child is connected to.
@return The device on the hub's port, or NULL if there is none.
**/
USB_DEVICE *
UsbFindChild (
IN USB_INTERFACE *HubIf,
IN UINT8 Port
)
{
USB_DEVICE *Device;
USB_BUS *Bus;
UINTN Index;
Bus = HubIf->Device->Bus;
//
// Start checking from device 1, device 0 is the root hub
//
for (Index = 1; Index < Bus->MaxDevices; Index++) {
Device = Bus->Devices[Index];
if ((Device != NULL) && (Device->ParentAddr == HubIf->Device->Address) &&
(Device->ParentPort == Port)) {
return Device;
}
}
return NULL;
}
/**
Enumerate and configure the new device on the port of this HUB interface.
@param HubIf The HUB that has the device connected.
@param Port The port index of the hub (started with zero).
@retval EFI_SUCCESS The device is enumerated (added or removed).
@retval EFI_OUT_OF_RESOURCES Failed to allocate resource for the device.
@retval Others Failed to enumerate the device.
**/
EFI_STATUS
UsbEnumerateNewDev (
IN USB_INTERFACE *HubIf,
IN UINT8 Port
)
{
USB_BUS *Bus;
USB_HUB_API *HubApi;
USB_DEVICE *Child;
USB_DEVICE *Parent;
EFI_USB_PORT_STATUS PortState;
UINTN Address;
UINT8 Config;
EFI_STATUS Status;
Parent = HubIf->Device;
Bus = Parent->Bus;
HubApi = HubIf->HubApi;
Address = Bus->MaxDevices;
gBS->Stall (USB_WAIT_PORT_STABLE_STALL);
//
// Hub resets the device for at least 10 milliseconds.
// Host learns device speed. If device is of low/full speed
// and the hub is a EHCI root hub, ResetPort will release
// the device to its companion UHCI and return an error.
//
Status = HubApi->ResetPort (HubIf, Port);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "UsbEnumerateNewDev: failed to reset port %d - %r\n", Port, Status));
return Status;
}
DEBUG (( EFI_D_INFO, "UsbEnumerateNewDev: hub port %d is reset\n", Port));
Child = UsbCreateDevice (HubIf, Port);
if (Child == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// OK, now identify the device speed. After reset, hub
// fully knows the actual device speed.
//
Status = HubApi->GetPortStatus (HubIf, Port, &PortState);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "UsbEnumerateNewDev: failed to get speed of port %d\n", Port));
goto ON_ERROR;
}
if (!USB_BIT_IS_SET (PortState.PortStatus, USB_PORT_STAT_CONNECTION)) {
DEBUG ((EFI_D_ERROR, "UsbEnumerateNewDev: No device presented at port %d\n", Port));
goto ON_ERROR;
} else if (USB_BIT_IS_SET (PortState.PortStatus, USB_PORT_STAT_SUPER_SPEED)){
Child->Speed = EFI_USB_SPEED_SUPER;
Child->MaxPacket0 = 512;
} else if (USB_BIT_IS_SET (PortState.PortStatus, USB_PORT_STAT_HIGH_SPEED)) {
Child->Speed = EFI_USB_SPEED_HIGH;
Child->MaxPacket0 = 64;
} else if (USB_BIT_IS_SET (PortState.PortStatus, USB_PORT_STAT_LOW_SPEED)) {
Child->Speed = EFI_USB_SPEED_LOW;
Child->MaxPacket0 = 8;
} else {
Child->Speed = EFI_USB_SPEED_FULL;
Child->MaxPacket0 = 8;
}
DEBUG (( EFI_D_INFO, "UsbEnumerateNewDev: device is of %d speed\n", Child->Speed));
if (((Child->Speed == EFI_USB_SPEED_LOW) || (Child->Speed == EFI_USB_SPEED_FULL)) &&
(Parent->Speed == EFI_USB_SPEED_HIGH)) {
//
// If the child is a low or full speed device, it is necessary to
// set the transaction translator. Port TT is 1-based.
// This is quite simple:
// 1. if parent is of high speed, then parent is our translator
// 2. otherwise use parent's translator.
//
Child->Translator.TranslatorHubAddress = Parent->Address;
Child->Translator.TranslatorPortNumber = (UINT8) (Port + 1);
} else {
Child->Translator = Parent->Translator;
}
DEBUG (( EFI_D_INFO, "UsbEnumerateNewDev: device uses translator (%d, %d)\n",
Child->Translator.TranslatorHubAddress,
Child->Translator.TranslatorPortNumber));
//
// After port is reset, hub establishes a signal path between
// the device and host (DEFALUT state). Device's registers are
// reset, use default address 0 (host enumerates one device at
// a time) , and ready to respond to control transfer at EP 0.
//
//
// Host assigns an address to the device. Device completes the
// status stage with default address, then switches to new address.
// ADDRESS state. Address zero is reserved for root hub.
//
ASSERT (Bus->MaxDevices <= 256);
for (Address = 1; Address < Bus->MaxDevices; Address++) {
if (Bus->Devices[Address] == NULL) {
break;
}
}
if (Address >= Bus->MaxDevices) {
DEBUG ((EFI_D_ERROR, "UsbEnumerateNewDev: address pool is full for port %d\n", Port));
Status = EFI_ACCESS_DENIED;
goto ON_ERROR;
}
Status = UsbSetAddress (Child, (UINT8)Address);
Child->Address = (UINT8)Address;
Bus->Devices[Address] = Child;
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "UsbEnumerateNewDev: failed to set device address - %r\n", Status));
goto ON_ERROR;
}
gBS->Stall (USB_SET_DEVICE_ADDRESS_STALL);
DEBUG ((EFI_D_INFO, "UsbEnumerateNewDev: device is now ADDRESSED at %d\n", Address));
//
// Host sends a Get_Descriptor request to learn the max packet
// size of default pipe (only part of the device's descriptor).
//
Status = UsbGetMaxPacketSize0 (Child);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "UsbEnumerateNewDev: failed to get max packet for EP 0 - %r\n", Status));
goto ON_ERROR;
}
DEBUG (( EFI_D_INFO, "UsbEnumerateNewDev: max packet size for EP 0 is %d\n", Child->MaxPacket0));
//
// Host learns about the device's abilities by requesting device's
// entire descriptions.
//
Status = UsbBuildDescTable (Child);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "UsbEnumerateNewDev: failed to build descriptor table - %r\n", Status));
goto ON_ERROR;
}
//
// Select a default configuration: UEFI must set the configuration
// before the driver can connect to the device.
//
Config = Child->DevDesc->Configs[0]->Desc.ConfigurationValue;
Status = UsbSetConfig (Child, Config);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "UsbEnumerateNewDev: failed to set configure %d - %r\n", Config, Status));
goto ON_ERROR;
}
DEBUG (( EFI_D_INFO, "UsbEnumerateNewDev: device %d is now in CONFIGED state\n", Address));
//
// Host assigns and loads a device driver.
//
Status = UsbSelectConfig (Child, Config);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "UsbEnumerateNewDev: failed to create interfaces - %r\n", Status));
goto ON_ERROR;
}
return EFI_SUCCESS;
ON_ERROR:
if (Address != Bus->MaxDevices) {
Bus->Devices[Address] = NULL;
}
if (Child != NULL) {
UsbFreeDevice (Child);
}
return Status;
}
/**
Process the events on the port.
@param HubIf The HUB that has the device connected.
@param Port The port index of the hub (started with zero).
@retval EFI_SUCCESS The device is enumerated (added or removed).
@retval EFI_OUT_OF_RESOURCES Failed to allocate resource for the device.
@retval Others Failed to enumerate the device.
**/
EFI_STATUS
UsbEnumeratePort (
IN USB_INTERFACE *HubIf,
IN UINT8 Port
)
{
USB_HUB_API *HubApi;
USB_DEVICE *Child;
EFI_USB_PORT_STATUS PortState;
EFI_STATUS Status;
Child = NULL;
HubApi = HubIf->HubApi;
//
// Host learns of the new device by polling the hub for port changes.
//
Status = HubApi->GetPortStatus (HubIf, Port, &PortState);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "UsbEnumeratePort: failed to get state of port %d\n", Port));
return Status;
}
//
// Only handle connection/enable/overcurrent/reset change.
// Usb super speed hub may report other changes, such as warm reset change. Ignore them.
//
if ((PortState.PortChangeStatus & (USB_PORT_STAT_C_CONNECTION | USB_PORT_STAT_C_ENABLE | USB_PORT_STAT_C_OVERCURRENT | USB_PORT_STAT_C_RESET)) == 0) {
return EFI_SUCCESS;
}
DEBUG (( EFI_D_INFO, "UsbEnumeratePort: port %d state - %02x, change - %02x on %p\n",
Port, PortState.PortChangeStatus, PortState.PortStatus, HubIf));
//
// This driver only process two kinds of events now: over current and
// connect/disconnect. Other three events are: ENABLE, SUSPEND, RESET.
// ENABLE/RESET is used to reset port. SUSPEND isn't supported.
//
if (USB_BIT_IS_SET (PortState.PortChangeStatus, USB_PORT_STAT_C_OVERCURRENT)) {
if (USB_BIT_IS_SET (PortState.PortStatus, USB_PORT_STAT_OVERCURRENT)) {
//
// Case1:
// Both OverCurrent and OverCurrentChange set, means over current occurs,
// which probably is caused by short circuit. It has to wait system hardware
// to perform recovery.
//
DEBUG (( EFI_D_ERROR, "UsbEnumeratePort: Critical Over Current\n", Port));
return EFI_DEVICE_ERROR;
}
//
// Case2:
// Only OverCurrentChange set, means system has been recoveried from
// over current. As a result, all ports are nearly power-off, so
// it's necessary to detach and enumerate all ports again.
//
DEBUG (( EFI_D_ERROR, "UsbEnumeratePort: 2.0 device Recovery Over Current\n", Port));
}
if (USB_BIT_IS_SET (PortState.PortChangeStatus, USB_PORT_STAT_C_ENABLE)) {
//
// Case3:
// 1.1 roothub port reg doesn't reflect over-current state, while its counterpart
// on 2.0 roothub does. When over-current has influence on 1.1 device, the port
// would be disabled, so it's also necessary to detach and enumerate again.
//
DEBUG (( EFI_D_ERROR, "UsbEnumeratePort: 1.1 device Recovery Over Current\n", Port));
}
if (USB_BIT_IS_SET (PortState.PortChangeStatus, USB_PORT_STAT_C_CONNECTION)) {
//
// Case4:
// Device connected or disconnected normally.
//
DEBUG ((EFI_D_ERROR, "UsbEnumeratePort: Device Connect/Discount Normally\n", Port));
}
//
// Following as the above cases, it's safety to remove and create again.
//
Child = UsbFindChild (HubIf, Port);
if (Child != NULL) {
DEBUG (( EFI_D_INFO, "UsbEnumeratePort: device at port %d removed from root hub %p\n", Port, HubIf));
UsbRemoveDevice (Child);
}
if (USB_BIT_IS_SET (PortState.PortStatus, USB_PORT_STAT_CONNECTION)) {
//
// Now, new device connected, enumerate and configure the device
//
DEBUG (( EFI_D_INFO, "UsbEnumeratePort: new device connected at port %d\n", Port));
Status = UsbEnumerateNewDev (HubIf, Port);
} else {
DEBUG (( EFI_D_INFO, "UsbEnumeratePort: device disconnected event on port %d\n", Port));
}
HubApi->ClearPortChange (HubIf, Port);
return Status;
}
/**
Enumerate all the changed hub ports.
@param Event The event that is triggered.
@param Context The context to the event.
**/
VOID
EFIAPI
UsbHubEnumeration (
IN EFI_EVENT Event,
IN VOID *Context
)
{
USB_INTERFACE *HubIf;
UINT8 Byte;
UINT8 Bit;
UINT8 Index;
ASSERT (Context != NULL);
HubIf = (USB_INTERFACE *) Context;
if (HubIf->ChangeMap == NULL) {
return ;
}
//
// HUB starts its port index with 1.
//
Byte = 0;
Bit = 1;
for (Index = 0; Index < HubIf->NumOfPort; Index++) {
if (USB_BIT_IS_SET (HubIf->ChangeMap[Byte], USB_BIT (Bit))) {
UsbEnumeratePort (HubIf, Index);
}
USB_NEXT_BIT (Byte, Bit);
}
UsbHubAckHubStatus (HubIf->Device);
gBS->FreePool (HubIf->ChangeMap);
HubIf->ChangeMap = NULL;
return ;
}
/**
Enumerate all the changed hub ports.
@param Event The event that is triggered.
@param Context The context to the event.
**/
VOID
EFIAPI
UsbRootHubEnumeration (
IN EFI_EVENT Event,
IN VOID *Context
)
{
USB_INTERFACE *RootHub;
UINT8 Index;
RootHub = (USB_INTERFACE *) Context;
for (Index = 0; Index < RootHub->NumOfPort; Index++) {
UsbEnumeratePort (RootHub, Index);
}
}
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