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 #define TP_VARIANT_JYT_SYNAPTICS	0x05
32 #define TP_VARIANT_SYNAPTICS		0x06
33 
34 /*
35  * Commands
36  */
37 #define TP_RECALIB		0x51	/* Recalibrate */
38 #define TP_POWER_DOWN		0x44	/* Can only be undone through HW reset */
39 #define TP_EXT_DEV		0x21	/* Determines if external device is connected (RO) */
40 #define TP_EXT_BTN		0x4B	/* Read extended button status */
41 #define TP_POR			0x7F	/* Execute Power on Reset */
42 #define TP_POR_RESULTS		0x25	/* Read Power on Self test results */
43 #define TP_DISABLE_EXT		0x40	/* Disable external pointing device */
44 #define TP_ENABLE_EXT		0x41	/* Enable external pointing device */
45 
46 /*
47  * Mode manipulation
48  */
49 #define TP_SET_SOFT_TRANS	0x4E	/* Set mode */
50 #define TP_CANCEL_SOFT_TRANS	0xB9	/* Cancel mode */
51 #define TP_SET_HARD_TRANS	0x45	/* Mode can only be set */
52 
53 
54 /*
55  * Register oriented commands/properties
56  */
57 #define TP_WRITE_MEM		0x81
58 #define TP_READ_MEM		0x80	/* Not used in this implementation */
59 
60 /*
61 * RAM Locations for properties
62  */
63 #define TP_SENS			0x4A	/* Sensitivity */
64 #define TP_MB			0x4C	/* Read Middle Button Status (RO) */
65 #define TP_INERTIA		0x4D	/* Negative Inertia */
66 #define TP_SPEED		0x60	/* Speed of TP Cursor */
67 #define TP_REACH		0x57	/* Backup for Z-axis press */
68 #define TP_DRAGHYS		0x58	/* Drag Hysteresis */
69 					/* (how hard it is to drag */
70 					/* with Z-axis pressed) */
71 
72 #define TP_MINDRAG		0x59	/* Minimum amount of force needed */
73 					/* to trigger dragging */
74 
75 #define TP_THRESH		0x5C	/* Minimum value for a Z-axis press */
76 #define TP_UP_THRESH		0x5A	/* Used to generate a 'click' on Z-axis */
77 #define TP_Z_TIME		0x5E	/* How sharp of a press */
78 #define TP_JENKS_CURV		0x5D	/* Minimum curvature for double click */
79 #define TP_DRIFT_TIME		0x5F	/* How long a 'hands off' condition */
80 					/* must last (x*107ms) for drift */
81 					/* correction to occur */
82 
83 /*
84  * Toggling Flag bits
85  */
86 #define TP_TOGGLE		0x47	/* Toggle command */
87 
88 #define TP_TOGGLE_MB		0x23	/* Disable/Enable Middle Button */
89 #define TP_MASK_MB			0x01
90 #define TP_TOGGLE_EXT_DEV	0x23	/* Disable external device */
91 #define TP_MASK_EXT_DEV			0x02
92 #define TP_TOGGLE_DRIFT		0x23	/* Drift Correction */
93 #define TP_MASK_DRIFT			0x80
94 #define TP_TOGGLE_BURST		0x28	/* Burst Mode */
95 #define TP_MASK_BURST			0x80
96 #define TP_TOGGLE_PTSON		0x2C	/* Press to Select */
97 #define TP_MASK_PTSON			0x01
98 #define TP_TOGGLE_HARD_TRANS	0x2C	/* Alternate method to set Hard Transparency */
99 #define TP_MASK_HARD_TRANS		0x80
100 #define TP_TOGGLE_TWOHAND	0x2D	/* Two handed */
101 #define TP_MASK_TWOHAND			0x01
102 #define TP_TOGGLE_STICKY_TWO	0x2D	/* Sticky two handed */
103 #define TP_MASK_STICKY_TWO		0x04
104 #define TP_TOGGLE_SKIPBACK	0x2D	/* Suppress movement after drag release */
105 #define TP_MASK_SKIPBACK		0x08
106 #define TP_TOGGLE_SOURCE_TAG	0x20	/* Bit 3 of the first packet will be set to
107 					   to the origin of the packet (external or TP) */
108 #define TP_MASK_SOURCE_TAG		0x80
109 #define TP_TOGGLE_EXT_TAG	0x22	/* Bit 3 of the first packet coming from the
110 					   external device will be forced to 1 */
111 #define TP_MASK_EXT_TAG			0x04
112 
113 
114 /* Power on Self Test Results */
115 #define TP_POR_SUCCESS		0x3B
116 
117 /*
118  * Default power on values
119  */
120 #define TP_DEF_SENS		0x80
121 #define TP_DEF_INERTIA		0x06
122 #define TP_DEF_SPEED		0x61
123 #define TP_DEF_REACH		0x0A
124 
125 #define TP_DEF_DRAGHYS		0xFF
126 #define TP_DEF_MINDRAG		0x14
127 
128 #define TP_DEF_THRESH		0x08
129 #define TP_DEF_UP_THRESH	0xFF
130 #define TP_DEF_Z_TIME		0x26
131 #define TP_DEF_JENKS_CURV	0x87
132 #define TP_DEF_DRIFT_TIME	0x05
133 
134 /* Toggles */
135 #define TP_DEF_MB		0x00
136 #define TP_DEF_PTSON		0x00
137 #define TP_DEF_SKIPBACK		0x00
138 #define TP_DEF_EXT_DEV		0x00	/* 0 means enabled */
139 #define TP_DEF_TWOHAND		0x00
140 #define TP_DEF_SOURCE_TAG	0x00
141 
142 #define MAKE_PS2_CMD(params, results, cmd) ((params<<12) | (results<<8) | (cmd))
143 
144 struct trackpoint_data {
145 	u8 variant_id;
146 	u8 firmware_id;
147 
148 	u8 sensitivity, speed, inertia, reach;
149 	u8 draghys, mindrag;
150 	u8 thresh, upthresh;
151 	u8 ztime, jenks;
152 	u8 drift_time;
153 
154 	/* toggles */
155 	bool press_to_select;
156 	bool skipback;
157 	bool ext_dev;
158 };
159 
160 int trackpoint_detect(struct psmouse *psmouse, bool set_properties);
161 
162 #endif /* _TRACKPOINT_H */
163