drivers/input/i8042prt/ps2pp.c

   1 /*
   2  * PROJECT:     ReactOS i8042 (ps/2 keyboard-mouse controller) driver
   3  * LICENSE:     GPL - See COPYING in the top level directory
   4  * FILE:        drivers/input/i8042prt/ps2pp.c
   5  * PURPOSE:     ps2pp protocol handling
   6  * PROGRAMMERS: Copyright Martijn Vernooij (o112w8r02@sneakemail.com)
   7  *              Copyright 2006-2007 Hervé Poussineau (hpoussin@reactos.org)
   8  */
   9
  10 /* INCLUDES ****************************************************************/
  11
  12 #include "i8042prt.h"
  13
  14 #include <debug.h>
  15
  16 /* FUNCTIONS *****************************************************************/
  17
  18 VOID
  19 i8042MouHandlePs2pp(
  20         IN PI8042_MOUSE_EXTENSION DeviceExtension,
  21         IN UCHAR Input)
  22 {
  23         UCHAR PktType;
  24         PMOUSE_INPUT_DATA MouseInput;
  25
  26         MouseInput = DeviceExtension->MouseBuffer + DeviceExtension->MouseInBuffer;
  27
  28         /* First, collect 3 bytes for a packet
  29          * We can detect out-of-sync only by checking
  30          * the whole packet anyway.
  31          *
  32          * If bit 7 and 8 of the first byte are 0, its
  33          * a normal packet.
  34          *
  35          * Otherwise, the packet is different, like this:
  36          * 1: E  1 b3 b2  1  x  x  x
  37          * 2: x  x b1 b0 x1 x0  1  0
  38          * 3: x  x  x  x  x  x x1 x0
  39          *
  40          * b3-0 form a code that specifies the packet type:
  41          *
  42          * 0  Device Type
  43          * 1  Rollers and buttons
  44          * 2   Reserved
  45          * 3   Reserved
  46          * 4  Device ID
  47          * 5  Channel & Battery
  48          * 6  Wireless notifications
  49          * 7   Reserved
  50          * 8  ShortID LSB (ShortID is a number that is supposed to differentiate
  51          * 9  ShortID MSB  between your mouse and your neighbours')
  52          * 10  Reserved
  53          * 11 Mouse capabilities
  54          * 12 Remote control LSB
  55          * 13 Remote control MSB
  56          * 14  Reserved
  57          * 15 Extended packet
  58          */
  59
  60         switch (DeviceExtension->MouseState)
  61         {
  62                 case MouseIdle:
  63                 case XMovement:
  64                         DeviceExtension->MouseLogiBuffer[DeviceExtension->MouseState] = Input;
  65                         DeviceExtension->MouseState++;
  66                         break;
  67
  68                 case YMovement:
  69                         DeviceExtension->MouseLogiBuffer[2] = Input;
  70                         DeviceExtension->MouseState = MouseIdle;
  71
  72                         /* first check if it's a normal packet */
  73
  74                         if (!(DeviceExtension->MouseLogiBuffer[0] & 0xC0))
  75                         {
  76                                 DeviceExtension->MouseState = MouseIdle;
  77                                 i8042MouHandle(DeviceExtension, DeviceExtension->MouseLogiBuffer[0]);
  78                                 i8042MouHandle(DeviceExtension, DeviceExtension->MouseLogiBuffer[1]);
  79                                 i8042MouHandle(DeviceExtension, DeviceExtension->MouseLogiBuffer[2]);
  80                                 /* We could care about wether MouseState really
  81                                  * advances, but we don't need to because we're
  82                                  * only doing three bytes anyway, so the packet
  83                                  * will never complete if it's broken.
  84                                  */
  85                                 return;
  86                         }
  87
  88                         /* sanity check */
  89                         if (((DeviceExtension->MouseLogiBuffer[0] & 0x48) != 0x48) ||
  90                            (((DeviceExtension->MouseLogiBuffer[1] & 0x0C) >> 2) !=
  91                              (DeviceExtension->MouseLogiBuffer[2] & 0x03)))
  92                                 {
  93                                         WARN_(I8042PRT, "Ps2pp packet fails sanity checks\n");
  94                                         return;
  95                                 }
  96
  97                         /* Now get the packet type */
  98                         PktType = ((DeviceExtension->MouseLogiBuffer[0] & 0x30) >> 2) |
  99                                   ((DeviceExtension->MouseLogiBuffer[1] & 0x30) >> 4);
 100
 101                         switch (PktType)
 102                         {
 103                                 case 0:
 104                                         /* The packet contains the device ID, but we
 105                                          * already read that in the initialization
 106                                          * sequence. Ignore it.
 107                                          */
 108                                         return;
 109                                 case 1:
 110                                         RtlZeroMemory(MouseInput, sizeof(MOUSE_INPUT_DATA));
 111                                         if (DeviceExtension->MouseLogiBuffer[2] & 0x10)
 112                                                 MouseInput->RawButtons |= MOUSE_BUTTON_4_DOWN;
 113
 114                                         if (DeviceExtension->MouseLogiBuffer[2] & 0x20)
 115                                                 MouseInput->RawButtons |= MOUSE_BUTTON_5_DOWN;
 116
 117                                         if (DeviceExtension->MouseLogiBuffer[2] & 0x0F)
 118                                         {
 119                                                 MouseInput->ButtonFlags |= MOUSE_WHEEL;
 120                                                 if (DeviceExtension->MouseLogiBuffer[2] & 0x08)
 121                                                         MouseInput->ButtonData = (DeviceExtension->MouseLogiBuffer[2] & 0x07) - 8;
 122                                                 else
 123                                                         MouseInput->ButtonData = DeviceExtension->MouseLogiBuffer[2] & 0x07;
 124                                         }
 125                                         i8042MouHandleButtons(
 126                                                 DeviceExtension,
 127                                                 MOUSE_BUTTON_4_DOWN | MOUSE_BUTTON_5_DOWN);
 128                                         DeviceExtension->MouseHook.QueueMousePacket(DeviceExtension->MouseHook.CallContext);
 129                                         return;
 130                                 default:
 131                                         /* These are for things that would probably
 132                                          * be handled by logitechs own driver.
 133                                          */
 134                                         return;
 135                         }
 136
 137                 default:
 138                         WARN_(I8042PRT, "Unexpected input state for ps2pp!\n");
 139         }
 140 }