--- /dev/null
+/*
+ * Acess 2 USB Stack
+ * - By John Hodge (thePowersGang)
+ *
+ * usb_lowlevel.c
+ * - Low Level IO
+ */
+#define DEBUG 1
+#include <acess.h>
+#include "usb.h"
+#include "usb_proto.h"
+#include "usb_lowlevel.h"
+
+// === PROTOTYPES ===
+void *USB_int_Request(tUSBHost *Host, int Addr, int EndPt, int Type, int Req, int Val, int Indx, int Len, void *Data);
+ int USB_int_SendSetupSetAddress(tUSBHost *Host, int Address);
+ int USB_int_ReadDescriptor(tUSBDevice *Dev, int Endpoint, int Type, int Index, int Length, void *Dest);
+char *USB_int_GetDeviceString(tUSBDevice *Dev, int Endpoint, int Index);
+ int _UTF16to8(Uint16 *Input, int InputLen, char *Dest);
+
+// === CODE ===
+void *USB_int_Request(tUSBHost *Host, int Addr, int EndPt, int Type, int Req, int Val, int Indx, int Len, void *Data)
+{
+ void *hdl;
+ // TODO: Sanity check (and check that Type is valid)
+ struct sDeviceRequest req;
+ req.ReqType = Type;
+ req.Request = Req;
+ req.Value = LittleEndian16( Val );
+ req.Index = LittleEndian16( Indx );
+ req.Length = LittleEndian16( Len );
+
+ hdl = Host->HostDef->SendSETUP(Host->Ptr, Addr, EndPt, 0, NULL, NULL, &req, sizeof(req));
+
+ // TODO: Data toggle?
+ // TODO: Multi-packet transfers
+ if( Type & 0x80 )
+ {
+ void *hdl2;
+
+ hdl = Host->HostDef->SendIN(Host->Ptr, Addr, EndPt, 0, NULL, NULL, Data, Len);
+
+ hdl2 = Host->HostDef->SendOUT(Host->Ptr, Addr, EndPt, 0, NULL, NULL, NULL, 0);
+ while( Host->HostDef->IsOpComplete(Host->Ptr, hdl2) == 0 )
+ Time_Delay(1);
+ }
+ else
+ {
+ void *hdl2;
+
+ if( Len > 0 )
+ hdl = Host->HostDef->SendOUT(Host->Ptr, Addr, EndPt, 0, NULL, NULL, Data, Len);
+ else
+ hdl = NULL;
+
+ // Status phase (DataToggle=1)
+ hdl2 = Host->HostDef->SendIN(Host->Ptr, Addr, EndPt, 1, NULL, NULL, NULL, 0);
+ while( Host->HostDef->IsOpComplete(Host->Ptr, hdl2) == 0 )
+ Time_Delay(1);
+ }
+ return hdl;
+}
+
+int USB_int_SendSetupSetAddress(tUSBHost *Host, int Address)
+{
+ USB_int_Request(Host, 0, 0, 0x00, 5, Address & 0x7F, 0, 0, NULL);
+ return 0;
+}
+
+int USB_int_ReadDescriptor(tUSBDevice *Dev, int Endpoint, int Type, int Index, int Length, void *Dest)
+{
+ const int ciMaxPacketSize = 0x400;
+ struct sDeviceRequest req;
+ int bToggle = 0;
+ void *final;
+
+ req.ReqType = 0x80;
+ switch( Type & 0xF00 )
+ {
+ case 0x000: req.ReqType |= (0 << 5); break; // Standard
+ case 0x100: req.ReqType |= (1 << 5); break; // Class
+ case 0x200: req.ReqType |= (2 << 5); break; // Vendor
+ }
+
+ req.Request = 6; // GET_DESCRIPTOR
+ req.Value = LittleEndian16( ((Type & 0xFF) << 8) | (Index & 0xFF) );
+ req.Index = LittleEndian16( 0 ); // TODO: Language ID
+ req.Length = LittleEndian16( Length );
+
+ Dev->Host->HostDef->SendSETUP(
+ Dev->Host->Ptr, Dev->Address, Endpoint,
+ 0, NULL, NULL,
+ &req, sizeof(req)
+ );
+
+ bToggle = 1;
+ while( Length > ciMaxPacketSize )
+ {
+ Dev->Host->HostDef->SendIN(
+ Dev->Host->Ptr, Dev->Address, Endpoint,
+ bToggle, NULL, NULL,
+ Dest, ciMaxPacketSize
+ );
+ bToggle = !bToggle;
+ Length -= ciMaxPacketSize;
+ }
+
+ final = Dev->Host->HostDef->SendIN(
+ Dev->Host->Ptr, Dev->Address, Endpoint,
+ bToggle, INVLPTR, NULL,
+ Dest, Length
+ );
+
+ while( Dev->Host->HostDef->IsOpComplete(Dev->Host->Ptr, final) == 0 )
+ Time_Delay(1);
+
+ return 0;
+}
+
+char *USB_int_GetDeviceString(tUSBDevice *Dev, int Endpoint, int Index)
+{
+ struct sDescriptor_String str;
+ int src_len, new_len;
+ char *ret;
+
+ if(Index == 0) return strdup("");
+
+ USB_int_ReadDescriptor(Dev, Endpoint, 3, Index, sizeof(str), &str);
+ if(str.Length < 2) {
+ Log_Error("USB", "String %p:%i:%i:%i descriptor is undersized (%i)",
+ Dev->Host, Dev->Address, Endpoint, Index, str.Length);
+ return NULL;
+ }
+// if(str.Length > sizeof(str)) {
+// // IMPOSSIBLE!
+// Log_Error("USB", "String is %i bytes, which is over prealloc size (%i)",
+// str.Length, sizeof(str)
+// );
+// }
+ src_len = (str.Length - 2) / sizeof(str.Data[0]);
+
+ LOG("&str = %p, src_len = %i", &str, src_len);
+
+ new_len = _UTF16to8(str.Data, src_len, NULL);
+ ret = malloc( new_len + 1 );
+ _UTF16to8(str.Data, src_len, ret);
+ ret[new_len] = 0;
+ return ret;
+}
+
+int _UTF16to8(Uint16 *Input, int InputLen, char *Dest)
+{
+ int str_len, cp_len;
+ Uint32 saved_bits = 0;
+ str_len = 0;
+ for( int i = 0; i < InputLen; i ++)
+ {
+ Uint32 cp;
+ Uint16 val = Input[i];
+ if( val >= 0xD800 && val <= 0xDBFF )
+ {
+ // Multibyte - Leading
+ if(i + 1 > InputLen) {
+ cp = '?';
+ }
+ else {
+ saved_bits = (val - 0xD800) << 10;
+ saved_bits += 0x10000;
+ continue ;
+ }
+ }
+ else if( val >= 0xDC00 && val <= 0xDFFF )
+ {
+ if( !saved_bits ) {
+ cp = '?';
+ }
+ else {
+ saved_bits |= (val - 0xDC00);
+ cp = saved_bits;
+ }
+ }
+ else
+ cp = val;
+
+ cp_len = WriteUTF8((Uint8*)Dest, cp);
+ if(Dest)
+ Dest += cp_len;
+ str_len += cp_len;
+
+ saved_bits = 0;
+ }
+
+ return str_len;
+}
+
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