From 9fb4cb18472084f483a7b3a6fe18bbe85f6a1089 Mon Sep 17 00:00:00 2001
From: v173k <v173k@users.noreply.github.com>
Date: Tue, 18 Nov 2014 18:56:28 -0600
Subject: [PATCH] Fix for PL2303HX chips so that PL2303::SndData() works.

Details: This was worked earlier by uncommenting "#define PL2303_COMPAT" from cdcprolific.h
I just re-added code by Oleg Mazurov which for some reason was lost during a later merge/pull request.
Also see: http://www.circuitsathome.com/mcu/major-acmprolific-bug-fix-posted-on-github
---
 cdcprolific.cpp | 41 ++++++++++++++++++++++++++++++++++++++++-
 cdcprolific.h   | 22 +++++++++++++++++++++-
 2 files changed, 61 insertions(+), 2 deletions(-)

diff --git a/cdcprolific.cpp b/cdcprolific.cpp
index d629ad55..8a06c388 100644
--- a/cdcprolific.cpp
+++ b/cdcprolific.cpp
@@ -30,6 +30,7 @@ uint8_t PL2303::Init(uint8_t parent, uint8_t port, bool lowspeed) {
         UsbDevice *p = NULL;
         EpInfo *oldep_ptr = NULL;
         uint8_t num_of_conf; // number of configurations
+		enum pl2303_type pltype = unknown;
 
         AddressPool &addrPool = pUsb->GetAddressPool();
 
@@ -69,6 +70,21 @@ uint8_t PL2303::Init(uint8_t parent, uint8_t port, bool lowspeed) {
         if(udd->idVendor != PL_VID && udd->idProduct != PL_PID)
                 return USB_DEV_CONFIG_ERROR_DEVICE_NOT_SUPPORTED;
 
+		/* determine chip variant */
+		
+		if (udd->bDeviceClass == 0x02 ) {
+			pltype = type_0;
+		}
+		else if (udd->bMaxPacketSize0 == 0x40 ) { 
+			pltype = rev_HX;
+		}
+		else if (udd->bDeviceClass == 0x00) {
+			pltype = type_1;
+		}
+		else if (udd->bDeviceClass == 0xff) {
+			pltype = type_1;
+		}
+				
         // Save type of PL chip
         wPLType = udd->bcdDevice;
 
@@ -144,7 +160,30 @@ uint8_t PL2303::Init(uint8_t parent, uint8_t port, bool lowspeed) {
 
         if(rcode)
                 goto FailSetConfDescr;
-
+				
+		#if defined(PL2303_COMPAT)
+			/* shamanic dance - sending Prolific init data as-is */
+			vendorRead( 0x84, 0x84, 0, buf );
+			vendorWrite( 0x04, 0x04, 0 );
+			vendorRead( 0x84, 0x84, 0, buf );
+			vendorRead( 0x83, 0x83, 0, buf );
+			vendorRead( 0x84, 0x84, 0, buf );
+			vendorWrite( 0x04, 0x04, 1 );
+			vendorRead( 0x84, 0x84, 0, buf);
+			vendorRead( 0x83, 0x83, 0, buf);
+			vendorWrite( 0, 0, 1 );
+			vendorWrite( 1, 0, 0 );
+			if ( pltype == rev_HX ) {
+				vendorWrite( 2, 0, 0x44 );
+				vendorWrite( 0x06, 0x06, 0 );   //from W7 init
+			}
+			else {
+			vendorWrite( 2, 0, 0x24 );
+			}
+			/* shamanic dance end */
+		#endif
+		
+		/* calling post-init callback */
         rcode = pAsync->OnInit(this);
 
         if(rcode)
diff --git a/cdcprolific.h b/cdcprolific.h
index bfa92fe3..7b964ca7 100644
--- a/cdcprolific.h
+++ b/cdcprolific.h
@@ -19,6 +19,8 @@ e-mail   :  support@circuitsathome.com
 
 #include "cdcacm.h"
 
+#define PL2303_COMPAT //uncomment it if you have compatibility problems
+
 #define PL_VID									0x067B
 #define PL_PID									( 0x2303 || 0x0609 )
 
@@ -106,7 +108,8 @@ enum tXO_State {
 
 enum pl2303_type {
         unknown,
-        type_1, /* don't know the difference between type 0 and */
+        type_0,
+		type_1, /* don't know the difference between type 0 and */
         rev_X, /* type 1, until someone from prolific tells us... */
         rev_HX, /* HX version of the pl2303 chip */
         rev_H
@@ -129,6 +132,23 @@ public:
 
         //// UsbConfigXtracter implementation
         //virtual void EndpointXtract(uint8_t conf, uint8_t iface, uint8_t alt, uint8_t proto, const USB_ENDPOINT_DESCRIPTOR *ep);
+
+private:
+        /* Prolific proprietary requests */
+        uint8_t vendorRead( uint8_t val_lo, uint8_t val_hi, uint16_t index, uint8_t* buf );
+        uint8_t vendorWrite( uint8_t val_lo, uint8_t val_hi, uint8_t index );
 };
 
+/* vendor read request */
+inline uint8_t PL2303::vendorRead( uint8_t val_lo, uint8_t val_hi, uint16_t index, uint8_t* buf )
+{
+        return( pUsb->ctrlReq(bAddress, 0, VENDOR_READ_REQUEST_TYPE, VENDOR_READ_REQUEST, val_lo, val_hi, index, 1, 1, buf, NULL ));
+}
+
+/* vendor write request */
+inline uint8_t PL2303::vendorWrite( uint8_t val_lo, uint8_t val_hi, uint8_t index )
+{
+        return( pUsb->ctrlReq(bAddress, 0, VENDOR_WRITE_REQUEST_TYPE, VENDOR_WRITE_REQUEST, val_lo, val_hi, index, 0, 0, NULL, NULL ));
+}
+
 #endif // __CDCPROLIFIC_H__