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trackpoint.h
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trackpoint.h
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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* IBM TrackPoint PS/2 mouse driver
*
* Stephen Evanchik <evanchsa@gmail.com>
*/
#ifndef _TRACKPOINT_H
#define _TRACKPOINT_H
/*
* These constants are from the TrackPoint System
* Engineering documentation Version 4 from IBM Watson
* research:
* http://wwwcssrv.almaden.ibm.com/trackpoint/download.html
*/
#define TP_COMMAND 0xE2 /* Commands start with this */
#define TP_READ_ID 0xE1 /* Sent for device identification */
/*
* Valid first byte responses to the "Read Secondary ID" (0xE1) command.
* 0x01 was the original IBM trackpoint, others implement very limited
* subset of trackpoint features.
*/
#define TP_VARIANT_IBM 0x01
#define TP_VARIANT_ALPS 0x02
#define TP_VARIANT_ELAN 0x03
#define TP_VARIANT_NXP 0x04
#define TP_VARIANT_JYT_SYNAPTICS 0x05
#define TP_VARIANT_SYNAPTICS 0x06
/*
* Commands
*/
#define TP_RECALIB 0x51 /* Recalibrate */
#define TP_POWER_DOWN 0x44 /* Can only be undone through HW reset */
#define TP_EXT_DEV 0x21 /* Determines if external device is connected (RO) */
#define TP_EXT_BTN 0x4B /* Read extended button status */
#define TP_POR 0x7F /* Execute Power on Reset */
#define TP_POR_RESULTS 0x25 /* Read Power on Self test results */
#define TP_DISABLE_EXT 0x40 /* Disable external pointing device */
#define TP_ENABLE_EXT 0x41 /* Enable external pointing device */
/*
* Mode manipulation
*/
#define TP_SET_SOFT_TRANS 0x4E /* Set mode */
#define TP_CANCEL_SOFT_TRANS 0xB9 /* Cancel mode */
#define TP_SET_HARD_TRANS 0x45 /* Mode can only be set */
/*
* Register oriented commands/properties
*/
#define TP_WRITE_MEM 0x81
#define TP_READ_MEM 0x80 /* Not used in this implementation */
/*
* RAM Locations for properties
*/
#define TP_SENS 0x4A /* Sensitivity */
#define TP_MB 0x4C /* Read Middle Button Status (RO) */
#define TP_INERTIA 0x4D /* Negative Inertia */
#define TP_SPEED 0x60 /* Speed of TP Cursor */
#define TP_REACH 0x57 /* Backup for Z-axis press */
#define TP_DRAGHYS 0x58 /* Drag Hysteresis */
/* (how hard it is to drag */
/* with Z-axis pressed) */
#define TP_MINDRAG 0x59 /* Minimum amount of force needed */
/* to trigger dragging */
#define TP_THRESH 0x5C /* Minimum value for a Z-axis press */
#define TP_UP_THRESH 0x5A /* Used to generate a 'click' on Z-axis */
#define TP_Z_TIME 0x5E /* How sharp of a press */
#define TP_JENKS_CURV 0x5D /* Minimum curvature for double click */
#define TP_DRIFT_TIME 0x5F /* How long a 'hands off' condition */
/* must last (x*107ms) for drift */
/* correction to occur */
/*
* Toggling Flag bits
*/
#define TP_TOGGLE 0x47 /* Toggle command */
#define TP_TOGGLE_MB 0x23 /* Disable/Enable Middle Button */
#define TP_MASK_MB 0x01
#define TP_TOGGLE_EXT_DEV 0x23 /* Disable external device */
#define TP_MASK_EXT_DEV 0x02
#define TP_TOGGLE_DRIFT 0x23 /* Drift Correction */
#define TP_MASK_DRIFT 0x80
#define TP_TOGGLE_BURST 0x28 /* Burst Mode */
#define TP_MASK_BURST 0x80
#define TP_TOGGLE_PTSON 0x2C /* Press to Select */
#define TP_MASK_PTSON 0x01
#define TP_TOGGLE_HARD_TRANS 0x2C /* Alternate method to set Hard Transparency */
#define TP_MASK_HARD_TRANS 0x80
#define TP_TOGGLE_TWOHAND 0x2D /* Two handed */
#define TP_MASK_TWOHAND 0x01
#define TP_TOGGLE_STICKY_TWO 0x2D /* Sticky two handed */
#define TP_MASK_STICKY_TWO 0x04
#define TP_TOGGLE_SKIPBACK 0x2D /* Suppress movement after drag release */
#define TP_MASK_SKIPBACK 0x08
#define TP_TOGGLE_SOURCE_TAG 0x20 /* Bit 3 of the first packet will be set to
to the origin of the packet (external or TP) */
#define TP_MASK_SOURCE_TAG 0x80
#define TP_TOGGLE_EXT_TAG 0x22 /* Bit 3 of the first packet coming from the
external device will be forced to 1 */
#define TP_MASK_EXT_TAG 0x04
/* Power on Self Test Results */
#define TP_POR_SUCCESS 0x3B
/*
* Default power on values
*/
#define TP_DEF_SENS 0x80
#define TP_DEF_INERTIA 0x06
#define TP_DEF_SPEED 0x61
#define TP_DEF_REACH 0x0A
#define TP_DEF_DRAGHYS 0xFF
#define TP_DEF_MINDRAG 0x14
#define TP_DEF_THRESH 0x08
#define TP_DEF_UP_THRESH 0xFF
#define TP_DEF_Z_TIME 0x26
#define TP_DEF_JENKS_CURV 0x87
#define TP_DEF_DRIFT_TIME 0x05
/* Toggles */
#define TP_DEF_MB 0x00
#define TP_DEF_PTSON 0x00
#define TP_DEF_SKIPBACK 0x00
#define TP_DEF_EXT_DEV 0x00 /* 0 means enabled */
#define TP_DEF_TWOHAND 0x00
#define TP_DEF_SOURCE_TAG 0x00
#define MAKE_PS2_CMD(params, results, cmd) ((params<<12) | (results<<8) | (cmd))
struct trackpoint_data {
u8 variant_id;
u8 firmware_id;
u8 sensitivity, speed, inertia, reach;
u8 draghys, mindrag;
u8 thresh, upthresh;
u8 ztime, jenks;
u8 drift_time;
/* toggles */
bool press_to_select;
bool skipback;
bool ext_dev;
};
int trackpoint_detect(struct psmouse *psmouse, bool set_properties);
#endif /* _TRACKPOINT_H */