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mouhid.sys: Read reports from the underlying HID device.

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Rémi Bernon 2024-02-13 11:38:46 +01:00 • committed by Alexandre Julliard
parent a05b67b7e5
commit 683710fbc7
1 changed files with 91 additions and 2 deletions
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93
dlls/mouhid.sys/main.c
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@ -44,6 +44,11 @@ struct device
DEVICE_OBJECT *bus_device;
PHIDP_PREPARSED_DATA preparsed;
FILE_OBJECT dummy_file;
IO_STATUS_BLOCK io;
ULONG report_len;
char *report_buf;
ULONG caps_count;
ULONG contact_max;
HIDP_VALUE_CAPS *id_caps;
@ -71,6 +76,71 @@ static inline LONG scale_value( ULONG value, const HIDP_VALUE_CAPS *caps, LONG m
return min + MulDiv( tmp - caps->LogicalMin, max - min, caps->LogicalMax - caps->LogicalMin );
}
static NTSTATUS WINAPI read_completion( DEVICE_OBJECT *device, IRP *irp, void *context );
static NTSTATUS start_device_read( DEVICE_OBJECT *device )
{
struct device *impl = impl_from_DEVICE_OBJECT( device );
IO_STACK_LOCATION *stack;
NTSTATUS status;
IRP *irp;
TRACE( "device %p\n", device );
irp = IoBuildAsynchronousFsdRequest( IRP_MJ_READ, device, impl->report_buf,
impl->report_len, NULL, &impl->io );
if (!irp) return STATUS_NO_MEMORY;
irp->Tail.Overlay.OriginalFileObject = &impl->dummy_file;
stack = IoGetNextIrpStackLocation( irp );
stack->FileObject = &impl->dummy_file;
TRACE( "created irp %p\n", irp );
IoSetCompletionRoutine( irp, read_completion, device, TRUE, TRUE, TRUE );
if ((status = IoCallDriver( impl->bus_device, irp )) && status != STATUS_PENDING) return status;
return STATUS_SUCCESS;
}
static void process_hid_report( struct device *impl, char *report_buf, UINT report_len )
{
ULONG contact_count;
NTSTATUS status;
TRACE( "impl %p, report_buf %p, report_len %u\n", impl, report_buf, report_len );
status = HidP_GetUsageValue( HidP_Input, HID_USAGE_PAGE_DIGITIZER, 0, HID_USAGE_DIGITIZER_CONTACT_COUNT,
&contact_count, impl->preparsed, report_buf, report_len );
if (status != HIDP_STATUS_SUCCESS) return;
if (contact_count > impl->contact_max)
{
WARN( "got %lu contacts, capping to %lu.\n", contact_count, impl->contact_max );
contact_count = impl->contact_max;
}
FIXME( "Not implemented\n" );
}
static NTSTATUS WINAPI read_completion( DEVICE_OBJECT *device, IRP *irp, void *context )
{
struct device *impl = impl_from_DEVICE_OBJECT( context );
NTSTATUS status;
TRACE( "device %p, irp %p, context %p\n", device, irp, context );
if (irp->IoStatus.Status)
WARN( "device read failed with status %#lx, stopping\n", irp->IoStatus.Status );
else
{
process_hid_report( impl, impl->report_buf, impl->report_len );
if (!InterlockedOr( &impl->removed, FALSE ) && (status = start_device_read( context )))
ERR( "Failed to start next read, status %#lx\n", status );
}
if (irp->PendingReturned) IoMarkIrpPending( irp );
return STATUS_SUCCESS;
}
static NTSTATUS WINAPI driver_ioctl( DEVICE_OBJECT *device, IRP *irp )
{
IO_STACK_LOCATION *stack = IoGetCurrentIrpStackLocation( irp );
@ -95,16 +165,26 @@ static NTSTATUS call_hid_device( DEVICE_OBJECT *device, DWORD major, DWORD code,
DWORD in_len, void *out_buf, DWORD out_len )
{
struct device *impl = impl_from_DEVICE_OBJECT( device );
IO_STACK_LOCATION *stack;
IO_STATUS_BLOCK io;
NTSTATUS status;
KEVENT event;
IRP *irp;
KeInitializeEvent( &event, NotificationEvent, FALSE );
irp = IoBuildDeviceIoControlRequest( code, device, in_buf, in_len, out_buf, out_len,
FALSE, &event, &io );
if (major == IRP_MJ_DEVICE_CONTROL)
irp = IoBuildDeviceIoControlRequest( code, device, in_buf, in_len, out_buf, out_len,
FALSE, &event, &io );
else
irp = IoBuildSynchronousFsdRequest( code, device, out_buf, out_len, NULL, &event, &io );
if (!irp) return STATUS_NO_MEMORY;
irp->Tail.Overlay.OriginalFileObject = &impl->dummy_file;
if (code == IRP_MJ_CREATE) irp->Flags |= IRP_CREATE_OPERATION;
if (code == IRP_MJ_CLOSE) irp->Flags |= IRP_CLOSE_OPERATION;
stack = IoGetNextIrpStackLocation( irp );
stack->FileObject = &impl->dummy_file;
status = IoCallDriver( impl->bus_device, irp );
if (status == STATUS_PENDING) KeWaitForSingleObject( &event, Executive, KernelMode, FALSE, NULL );
return io.Status;
@ -120,6 +200,7 @@ static NTSTATUS initialize_device( DEVICE_OBJECT *device )
NTSTATUS status;
HIDP_CAPS caps;
if ((status = call_hid_device( device, IRP_MJ_CREATE, 0, NULL, 0, NULL, 0 ))) return status;
if ((status = call_hid_device( device, IRP_MJ_DEVICE_CONTROL, IOCTL_HID_GET_COLLECTION_INFORMATION,
&info, 0, &info, sizeof(info) )))
return status;
@ -175,6 +256,10 @@ static NTSTATUS initialize_device( DEVICE_OBJECT *device )
impl->y_caps, &count, impl->preparsed );
if (status != HIDP_STATUS_SUCCESS) goto failed;
impl->report_len = caps.InputReportByteLength;
if (!(impl->report_buf = malloc( impl->report_len ))) return STATUS_NO_MEMORY;
impl->report_buf[0] = value_caps.ReportID;
return STATUS_SUCCESS;
}
@ -213,6 +298,7 @@ static NTSTATUS WINAPI driver_pnp( DEVICE_OBJECT *device, IRP *irp )
status = irp->IoStatus.Status;
}
if (!status) status = initialize_device( device );
if (!status) status = start_device_read( device );
if (status) irp->IoStatus.Status = status;
IoCompleteRequest( irp, IO_NO_INCREMENT );
@ -220,6 +306,8 @@ static NTSTATUS WINAPI driver_pnp( DEVICE_OBJECT *device, IRP *irp )
case IRP_MN_SURPRISE_REMOVAL:
status = STATUS_SUCCESS;
if (InterlockedExchange( &impl->removed, TRUE )) break;
call_hid_device( device, IRP_MJ_CLOSE, 0, NULL, 0, NULL, 0 );
break;
case IRP_MN_REMOVE_DEVICE:
@ -229,6 +317,7 @@ static NTSTATUS WINAPI driver_pnp( DEVICE_OBJECT *device, IRP *irp )
free( impl->id_caps );
free( impl->x_caps );
free( impl->y_caps );
free( impl->report_buf );
free( impl->preparsed );
IoDeleteDevice( device );
return status;