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