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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/drivers/input/mouse/elantech.h
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/*

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 * Elantech Touchpad driver (v6)

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 *

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 * Copyright (C) 2007-2009 Arjan Opmeer <[email protected]>

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 *

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 * This program is free software; you can redistribute it and/or modify it

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 * under the terms of the GNU General Public License version 2 as published

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 * by the Free Software Foundation.

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 *

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 * Trademarks are the property of their respective owners.

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 */

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#ifndef _ELANTECH_H

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#define _ELANTECH_H

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/*

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 * Command values for Synaptics style queries

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 */

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#define ETP_FW_VERSION_QUERY		0x01

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#define ETP_CAPABILITIES_QUERY		0x02

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/*

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 * Command values for register reading or writing

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 */

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#define ETP_REGISTER_READ		0x10

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#define ETP_REGISTER_WRITE		0x11

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/*

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 * Hardware version 2 custom PS/2 command value

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 */

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#define ETP_PS2_CUSTOM_COMMAND		0xf8

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/*

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 * Times to retry a ps2_command and millisecond delay between tries

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 */

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#define ETP_PS2_COMMAND_TRIES		3

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#define ETP_PS2_COMMAND_DELAY		500

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/*

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 * Times to try to read back a register and millisecond delay between tries

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 */

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#define ETP_READ_BACK_TRIES		5

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#define ETP_READ_BACK_DELAY		2000

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/*

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 * Register bitmasks for hardware version 1

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 */

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#define ETP_R10_ABSOLUTE_MODE		0x04

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#define ETP_R11_4_BYTE_MODE		0x02

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/*

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 * Capability bitmasks

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 */

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#define ETP_CAP_HAS_ROCKER		0x04

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/*

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 * One hard to find application note states that X axis range is 0 to 576

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 * and Y axis range is 0 to 384 for harware version 1.

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 * Edge fuzz might be necessary because of bezel around the touchpad

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 */

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#define ETP_EDGE_FUZZ_V1		32

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#define ETP_XMIN_V1			(  0 + ETP_EDGE_FUZZ_V1)

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#define ETP_XMAX_V1			(576 - ETP_EDGE_FUZZ_V1)

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#define ETP_YMIN_V1			(  0 + ETP_EDGE_FUZZ_V1)

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#define ETP_YMAX_V1			(384 - ETP_EDGE_FUZZ_V1)

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/*

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 * It seems the resolution for hardware version 2 doubled.

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 * Hence the X and Y ranges are doubled too.

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 * The bezel around the pad also appears to be smaller

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 */

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#define ETP_EDGE_FUZZ_V2		8

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#define ETP_XMIN_V2			(   0 + ETP_EDGE_FUZZ_V2)

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#define ETP_XMAX_V2			(1152 - ETP_EDGE_FUZZ_V2)

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#define ETP_YMIN_V2			(   0 + ETP_EDGE_FUZZ_V2)

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#define ETP_YMAX_V2			( 768 - ETP_EDGE_FUZZ_V2)

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#define ETP_PMIN_V2			0

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#define ETP_PMAX_V2			255

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#define ETP_WMIN_V2			0

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#define ETP_WMAX_V2			15

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/*

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 * For two finger touches the coordinate of each finger gets reported

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 * separately but with reduced resolution.

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 */

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#define ETP_2FT_FUZZ			4

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#define ETP_2FT_XMIN			(  0 + ETP_2FT_FUZZ)

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#define ETP_2FT_XMAX			(288 - ETP_2FT_FUZZ)

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#define ETP_2FT_YMIN			(  0 + ETP_2FT_FUZZ)

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#define ETP_2FT_YMAX			(192 - ETP_2FT_FUZZ)

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struct elantech_data {

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	unsigned char reg_10;

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	unsigned char reg_11;

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	unsigned char reg_20;

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	unsigned char reg_21;

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	unsigned char reg_22;

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	unsigned char reg_23;

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	unsigned char reg_24;

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	unsigned char reg_25;

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	unsigned char reg_26;

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	unsigned char debug;

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	unsigned char capabilities;

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	bool paritycheck;

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	bool jumpy_cursor;

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	bool reports_pressure;

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	unsigned char hw_version;

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	unsigned int fw_version;

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	unsigned int single_finger_reports;

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	unsigned char parity[256];

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};

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#ifdef CONFIG_MOUSE_PS2_ELANTECH

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int elantech_detect(struct psmouse *psmouse, bool set_properties);

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int elantech_init(struct psmouse *psmouse);

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#else

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static inline int elantech_detect(struct psmouse *psmouse, bool set_properties)

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{

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	return -ENOSYS;

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}

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static inline int elantech_init(struct psmouse *psmouse)

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{

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	return -ENOSYS;

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}

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#endif /* CONFIG_MOUSE_PS2_ELANTECH */

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#endif

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