linux-arkmicro/linux/drivers/input/touchscreen/tsc2007.h

/*
 * Copyright (c) 2008 MtekVision Co., Ltd.
 *	Kwangwoo Lee <kwlee@mtekvision.com>
 *
 * Using code from:
 *  - ads7846.c
 *	Copyright (c) 2005 David Brownell
 *	Copyright (c) 2006 Nokia Corporation
 *  - corgi_ts.c
 *	Copyright (C) 2004-2005 Richard Purdie
 *  - omap_ts.[hc], ads7846.h, ts_osk.c
 *	Copyright (C) 2002 MontaVista Software
 *	Copyright (C) 2004 Texas Instruments
 *	Copyright (C) 2005 Dirk Behme
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */

#ifndef _TSC2007_H
#define _TSC2007_H

#define TSC2007_MEASURE_TEMP0		(0x0 << 4)
#define TSC2007_MEASURE_AUX		(0x2 << 4)
#define TSC2007_MEASURE_TEMP1		(0x4 << 4)
#define TSC2007_ACTIVATE_XN		(0x8 << 4)
#define TSC2007_ACTIVATE_YN		(0x9 << 4)
#define TSC2007_ACTIVATE_YP_XN		(0xa << 4)
#define TSC2007_SETUP			(0xb << 4)
#define TSC2007_MEASURE_X		(0xc << 4)
#define TSC2007_MEASURE_Y		(0xd << 4)
#define TSC2007_MEASURE_Z1		(0xe << 4)
#define TSC2007_MEASURE_Z2		(0xf << 4)

#define TSC2007_POWER_OFF_IRQ_EN	(0x0 << 2)
#define TSC2007_ADC_ON_IRQ_DIS0		(0x1 << 2)
#define TSC2007_ADC_OFF_IRQ_EN		(0x2 << 2)
#define TSC2007_ADC_ON_IRQ_DIS1		(0x3 << 2)

#define TSC2007_12BIT			(0x0 << 1)
#define TSC2007_8BIT			(0x1 << 1)

#define MAX_12BIT			((1 << 12) - 1)

#define ADC_ON_12BIT	(TSC2007_12BIT | TSC2007_ADC_ON_IRQ_DIS0)

#define READ_Y		(ADC_ON_12BIT | TSC2007_MEASURE_Y)
#define READ_Z1		(ADC_ON_12BIT | TSC2007_MEASURE_Z1)
#define READ_Z2		(ADC_ON_12BIT | TSC2007_MEASURE_Z2)
#define READ_X		(ADC_ON_12BIT | TSC2007_MEASURE_X)
#define PWRDOWN		(TSC2007_12BIT | TSC2007_POWER_OFF_IRQ_EN)

struct ts_event {
	u16	x;
	u16	y;
	u16	z1, z2;
};

struct tsc2007 {
	struct input_dev	*input;
	char			phys[32];

	struct i2c_client	*client;

	u16			model;
	u16			x_plate_ohms;
	u16			max_rt;
	unsigned long		poll_period; /* in jiffies */
	int			fuzzx;
	int			fuzzy;
	int			fuzzz;

	unsigned int		gpio;
	int			irq;

	wait_queue_head_t	wait;
	bool			stopped;

	int			(*get_pendown_state)(struct device *);
	void			(*clear_penirq)(void);

	struct mutex		mlock;
};

int tsc2007_xfer(struct tsc2007 *tsc, u8 cmd);
u32 tsc2007_calculate_resistance(struct tsc2007 *tsc, struct ts_event *tc);
bool tsc2007_is_pen_down(struct tsc2007 *ts);

#if IS_ENABLED(CONFIG_TOUCHSCREEN_TSC2007_IIO)
/* defined in tsc2007_iio.c */
int tsc2007_iio_configure(struct tsc2007 *ts);
#else
static inline int tsc2007_iio_configure(struct tsc2007 *ts)
{
	return 0;
}
#endif /* CONFIG_TOUCHSCREEN_TSC2007_IIO */

#endif /* _TSC2007_H */