From 627f3aa478e8099e3660d6a429f1584eeca0724c Mon Sep 17 00:00:00 2001
From: Scott Talbert <swt@techie.net>
Date: Tue, 28 Jan 2014 23:35:06 -0500
Subject: [PATCH] windows: Set the OS report buffer size to 64 reports

Resolves issues with dropped input reports when receiving a large amount
of data.
---
 windows/hid.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/windows/hid.c b/windows/hid.c
index 3dee05b..179f88e 100755
--- a/windows/hid.c
+++ b/windows/hid.c
@@ -106,6 +106,7 @@ extern "C" {
 	typedef BOOLEAN (__stdcall *HidD_GetPreparsedData_)(HANDLE handle, PHIDP_PREPARSED_DATA *preparsed_data);
 	typedef BOOLEAN (__stdcall *HidD_FreePreparsedData_)(PHIDP_PREPARSED_DATA preparsed_data);
 	typedef NTSTATUS (__stdcall *HidP_GetCaps_)(PHIDP_PREPARSED_DATA preparsed_data, HIDP_CAPS *caps);
+	typedef BOOLEAN (__stdcall *HidD_SetNumInputBuffers_)(HANDLE handle, ULONG number_buffers);
 
 	static HidD_GetAttributes_ HidD_GetAttributes;
 	static HidD_GetSerialNumberString_ HidD_GetSerialNumberString;
@@ -117,6 +118,7 @@ extern "C" {
 	static HidD_GetPreparsedData_ HidD_GetPreparsedData;
 	static HidD_FreePreparsedData_ HidD_FreePreparsedData;
 	static HidP_GetCaps_ HidP_GetCaps;
+	static HidD_SetNumInputBuffers_ HidD_SetNumInputBuffers;
 
 	static HMODULE lib_handle = NULL;
 	static BOOLEAN initialized = FALSE;
@@ -206,6 +208,7 @@ static int lookup_functions()
 		RESOLVE(HidD_GetPreparsedData);
 		RESOLVE(HidD_FreePreparsedData);
 		RESOLVE(HidP_GetCaps);
+		RESOLVE(HidD_SetNumInputBuffers);
 #undef RESOLVE
 	}
 	else
@@ -567,6 +570,13 @@ HID_API_EXPORT hid_device * HID_API_CALL hid_open_path(const char *path)
 		goto err;
 	}
 
+	/* Set the Input Report buffer size to 64 reports. */
+	res = HidD_SetNumInputBuffers(dev->device_handle, 64);
+	if (!res) {
+		register_error(dev, "HidD_SetNumInputBuffers");
+		goto err;
+	}
+
 	/* Get the Input Report length for the device. */
 	res = HidD_GetPreparsedData(dev->device_handle, &pp_data);
 	if (!res) {