drivers/input/mouse/trackpoint.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * IBM TrackPoint PS/2 mouse driver
   4  *
   5  * Stephen Evanchik <evanchsa@gmail.com>
   6  */
   7
   8 #ifndef _TRACKPOINT_H
   9 #define _TRACKPOINT_H
  10
  11 /*
  12  * These constants are from the TrackPoint System
  13  * Engineering documentation Version 4 from IBM Watson
  14  * research:
  15  *      http://wwwcssrv.almaden.ibm.com/trackpoint/download.html
  16  */
  17
  18 #define TP_COMMAND              0xE2    /* Commands start with this */
  19
  20 #define TP_READ_ID              0xE1    /* Sent for device identification */
  21
  22 /*
  23  * Valid first byte responses to the "Read Secondary ID" (0xE1) command.
  24  * 0x01 was the original IBM trackpoint, others implement very limited
  25  * subset of trackpoint features.
  26  */
  27 #define TP_VARIANT_IBM          0x01
  28 #define TP_VARIANT_ALPS         0x02
  29 #define TP_VARIANT_ELAN         0x03
  30 #define TP_VARIANT_NXP          0x04
  31
  32 /*
  33  * Commands
  34  */
  35 #define TP_RECALIB              0x51    /* Recalibrate */
  36 #define TP_POWER_DOWN           0x44    /* Can only be undone through HW reset */
  37 #define TP_EXT_DEV              0x21    /* Determines if external device is connected (RO) */
  38 #define TP_EXT_BTN              0x4B    /* Read extended button status */
  39 #define TP_POR                  0x7F    /* Execute Power on Reset */
  40 #define TP_POR_RESULTS          0x25    /* Read Power on Self test results */
  41 #define TP_DISABLE_EXT          0x40    /* Disable external pointing device */
  42 #define TP_ENABLE_EXT           0x41    /* Enable external pointing device */
  43
  44 /*
  45  * Mode manipulation
  46  */
  47 #define TP_SET_SOFT_TRANS       0x4E    /* Set mode */
  48 #define TP_CANCEL_SOFT_TRANS    0xB9    /* Cancel mode */
  49 #define TP_SET_HARD_TRANS       0x45    /* Mode can only be set */
  50
  51
  52 /*
  53  * Register oriented commands/properties
  54  */
  55 #define TP_WRITE_MEM            0x81
  56 #define TP_READ_MEM             0x80    /* Not used in this implementation */
  57
  58 /*
  59 * RAM Locations for properties
  60  */
  61 #define TP_SENS                 0x4A    /* Sensitivity */
  62 #define TP_MB                   0x4C    /* Read Middle Button Status (RO) */
  63 #define TP_INERTIA              0x4D    /* Negative Inertia */
  64 #define TP_SPEED                0x60    /* Speed of TP Cursor */
  65 #define TP_REACH                0x57    /* Backup for Z-axis press */
  66 #define TP_DRAGHYS              0x58    /* Drag Hysteresis */
  67                                         /* (how hard it is to drag */
  68                                         /* with Z-axis pressed) */
  69
  70 #define TP_MINDRAG              0x59    /* Minimum amount of force needed */
  71                                         /* to trigger dragging */
  72
  73 #define TP_THRESH               0x5C    /* Minimum value for a Z-axis press */
  74 #define TP_UP_THRESH            0x5A    /* Used to generate a 'click' on Z-axis */
  75 #define TP_Z_TIME               0x5E    /* How sharp of a press */
  76 #define TP_JENKS_CURV           0x5D    /* Minimum curvature for double click */
  77 #define TP_DRIFT_TIME           0x5F    /* How long a 'hands off' condition */
  78                                         /* must last (x*107ms) for drift */
  79                                         /* correction to occur */
  80
  81 /*
  82  * Toggling Flag bits
  83  */
  84 #define TP_TOGGLE               0x47    /* Toggle command */
  85
  86 #define TP_TOGGLE_MB            0x23    /* Disable/Enable Middle Button */
  87 #define TP_MASK_MB                      0x01
  88 #define TP_TOGGLE_EXT_DEV       0x23    /* Disable external device */
  89 #define TP_MASK_EXT_DEV                 0x02
  90 #define TP_TOGGLE_DRIFT         0x23    /* Drift Correction */
  91 #define TP_MASK_DRIFT                   0x80
  92 #define TP_TOGGLE_BURST         0x28    /* Burst Mode */
  93 #define TP_MASK_BURST                   0x80
  94 #define TP_TOGGLE_PTSON         0x2C    /* Press to Select */
  95 #define TP_MASK_PTSON                   0x01
  96 #define TP_TOGGLE_HARD_TRANS    0x2C    /* Alternate method to set Hard Transparency */
  97 #define TP_MASK_HARD_TRANS              0x80
  98 #define TP_TOGGLE_TWOHAND       0x2D    /* Two handed */
  99 #define TP_MASK_TWOHAND                 0x01
 100 #define TP_TOGGLE_STICKY_TWO    0x2D    /* Sticky two handed */
 101 #define TP_MASK_STICKY_TWO              0x04
 102 #define TP_TOGGLE_SKIPBACK      0x2D    /* Suppress movement after drag release */
 103 #define TP_MASK_SKIPBACK                0x08
 104 #define TP_TOGGLE_SOURCE_TAG    0x20    /* Bit 3 of the first packet will be set to
 105                                            to the origin of the packet (external or TP) */
 106 #define TP_MASK_SOURCE_TAG              0x80
 107 #define TP_TOGGLE_EXT_TAG       0x22    /* Bit 3 of the first packet coming from the
 108                                            external device will be forced to 1 */
 109 #define TP_MASK_EXT_TAG                 0x04
 110
 111
 112 /* Power on Self Test Results */
 113 #define TP_POR_SUCCESS          0x3B
 114
 115 /*
 116  * Default power on values
 117  */
 118 #define TP_DEF_SENS             0x80
 119 #define TP_DEF_INERTIA          0x06
 120 #define TP_DEF_SPEED            0x61
 121 #define TP_DEF_REACH            0x0A
 122
 123 #define TP_DEF_DRAGHYS          0xFF
 124 #define TP_DEF_MINDRAG          0x14
 125
 126 #define TP_DEF_THRESH           0x08
 127 #define TP_DEF_UP_THRESH        0xFF
 128 #define TP_DEF_Z_TIME           0x26
 129 #define TP_DEF_JENKS_CURV       0x87
 130 #define TP_DEF_DRIFT_TIME       0x05
 131
 132 /* Toggles */
 133 #define TP_DEF_MB               0x00
 134 #define TP_DEF_PTSON            0x00
 135 #define TP_DEF_SKIPBACK         0x00
 136 #define TP_DEF_EXT_DEV          0x00    /* 0 means enabled */
 137 #define TP_DEF_TWOHAND          0x00
 138 #define TP_DEF_SOURCE_TAG       0x00
 139
 140 #define MAKE_PS2_CMD(params, results, cmd) ((params<<12) | (results<<8) | (cmd))
 141
 142 struct trackpoint_data {
 143         u8 variant_id;
 144         u8 firmware_id;
 145
 146         u8 sensitivity, speed, inertia, reach;
 147         u8 draghys, mindrag;
 148         u8 thresh, upthresh;
 149         u8 ztime, jenks;
 150         u8 drift_time;
 151
 152         /* toggles */
 153         bool press_to_select;
 154         bool skipback;
 155         bool ext_dev;
 156 };
 157
 158 int trackpoint_detect(struct psmouse *psmouse, bool set_properties);
 159
 160 #endif /* _TRACKPOINT_H */