26/77: [USBPORT] Add USB2_CheckTtEndpointInsert().

[Vadim Galyant]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=c3803bed8a31f9ac138b1…

commit c3803bed8a31f9ac138b1625d5c86187676d7bca
Author:     Vadim Galyant <vgal(a)rambler.ru>
AuthorDate: Wed Nov 29 23:25:12 2017 +0900
Commit:     Amine Khaldi <amine.khaldi(a)reactos.org>
CommitDate: Sun Jan 21 19:35:43 2018 +0100

    [USBPORT] Add USB2_CheckTtEndpointInsert().
---
 drivers/usb/usbport/usb2.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/drivers/usb/usbport/usb2.c b/drivers/usb/usbport/usb2.c
index 080d48cf21..ad8375db20 100644
--- a/drivers/usb/usbport/usb2.c
+++ b/drivers/usb/usbport/usb2.c
@@ -38,6 +38,52 @@ USB2_AddDataBitStuff(IN USHORT DataTime)
     return (DataTime + (DataTime / 16));
 }
 
+BOOLEAN
+NTAPI
+USB2_CheckTtEndpointInsert(IN PUSB2_TT_ENDPOINT nextTtEndpoint,
+                           IN PUSB2_TT_ENDPOINT TtEndpoint)
+{
+    ULONG TransferType;
+
+    DPRINT("USB2_CheckTtEndpointInsert: nextTtEndpoint - %p, TtEndpoint -
%p\n",
+           nextTtEndpoint,
+           TtEndpoint);
+
+    ASSERT(TtEndpoint);
+
+    if (TtEndpoint->CalcBusTime >= (USB2_FS_MAX_PERIODIC_ALLOCATION / 2))
+    {
+        DPRINT1("USB2_CheckTtEndpointInsert: Result - FALSE\n");
+        return FALSE;
+    }
+
+    if (!nextTtEndpoint)
+    {
+        DPRINT("USB2_CheckTtEndpointInsert: Result - TRUE\n");
+        return TRUE;
+    }
+
+    TransferType = TtEndpoint->TtEndpointParams.TransferType;
+
+    if (nextTtEndpoint->ActualPeriod < TtEndpoint->ActualPeriod &&
+        TransferType == USBPORT_TRANSFER_TYPE_INTERRUPT)
+    {
+        DPRINT("USB2_CheckTtEndpointInsert: Result - TRUE\n");
+        return TRUE;
+    }
+
+    if ((nextTtEndpoint->ActualPeriod <= TtEndpoint->ActualPeriod &&
+        TransferType == USBPORT_TRANSFER_TYPE_ISOCHRONOUS) ||
+        nextTtEndpoint == TtEndpoint)
+    {
+        DPRINT("USB2_CheckTtEndpointInsert: Result - TRUE\n");
+        return TRUE;
+    }
+
+    DPRINT("USB2_CheckTtEndpointInsert: Result - FALSE\n");
+    return FALSE;
+}
+
 ULONG
 NTAPI
 USB2_GetOverhead(IN PUSB2_TT_ENDPOINT TtEndpoint)