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Commit 6b0f8f9c authored by Böszörményi Zoltán's avatar Böszörményi Zoltán Committed by Dmitry Torokhov
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Input: add eGalaxTouch serial touchscreen driver 

There are two EETI touchscreen drivers in the kernel (eeti_ts and
egalax_ts) but both are for I2C-connected panels. This is for a different,
serial and not multi-touch touchscreen panel. The protocol documentation is
at http://www.eeti.com.tw/pdf/Software%20Programming%20Guide_v2.0.pdf



Signed-off-by: default avatarBöszörményi Zoltán <zboszor@pr.hu>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent f889beaa

drivers/input/touchscreen/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -295,6 +295,16 @@ config TOUCHSCREEN_EGALAX 
	  To compile this driver as a module, choose M here: the

	  module will be called egalax_ts.



config TOUCHSCREEN_EGALAX_SERIAL

	tristate "EETI eGalax serial touchscreen"

	select SERIO

	help

	  Say Y here to enable support for serial connected EETI

	  eGalax touch panels.



	  To compile this driver as a module, choose M here: the

	  module will be called egalax_ts_serial.



config TOUCHSCREEN_FT6236

	tristate "FT6236 I2C touchscreen"

	depends on I2C

drivers/input/touchscreen/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o 
obj-$(CONFIG_TOUCHSCREEN_ELAN)		+= elants_i2c.o

obj-$(CONFIG_TOUCHSCREEN_ELO)		+= elo.o

obj-$(CONFIG_TOUCHSCREEN_EGALAX)	+= egalax_ts.o

obj-$(CONFIG_TOUCHSCREEN_EGALAX_SERIAL)	+= egalax_ts_serial.o

obj-$(CONFIG_TOUCHSCREEN_FT6236)	+= ft6236.o

obj-$(CONFIG_TOUCHSCREEN_FUJITSU)	+= fujitsu_ts.o

obj-$(CONFIG_TOUCHSCREEN_GOODIX)	+= goodix.o

drivers/input/touchscreen/egalax_ts_serial.c

0 → 100644
+194 −0
Original line number Diff line number Diff line 
/*

 * EETI Egalax serial touchscreen driver

 *

 * Copyright (c) 2015 Zoltán Böszörményi <zboszor@pr.hu>

 *

 * based on the

 *

 * Hampshire serial touchscreen driver (Copyright (c) 2010 Adam Bennett)

 */



/*

 * 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.

 */



#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/input.h>

#include <linux/serio.h>



#define DRIVER_DESC	"EETI Egalax serial touchscreen driver"



/*

 * Definitions & global arrays.

 */



#define EGALAX_FORMAT_MAX_LENGTH	6

#define EGALAX_FORMAT_START_BIT		BIT(7)

#define EGALAX_FORMAT_PRESSURE_BIT	BIT(6)

#define EGALAX_FORMAT_TOUCH_BIT		BIT(0)

#define EGALAX_FORMAT_RESOLUTION_MASK	0x06



#define EGALAX_MIN_XC			0

#define EGALAX_MAX_XC			0x4000

#define EGALAX_MIN_YC			0

#define EGALAX_MAX_YC			0x4000



/*

 * Per-touchscreen data.

 */

struct egalax {

	struct input_dev *input;

	struct serio *serio;

	int idx;

	u8 data[EGALAX_FORMAT_MAX_LENGTH];

	char phys[32];

};



static void egalax_process_data(struct egalax *egalax)

{

	struct input_dev *dev = egalax->input;

	u8 *data = egalax->data;

	u16 x, y;

	u8 shift;

	u8 mask;



	shift = 3 - ((data[0] & EGALAX_FORMAT_RESOLUTION_MASK) >> 1);

	mask = 0xff >> (shift + 1);



	x = (((u16)(data[1] & mask) << 7) | (data[2] & 0x7f)) << shift;

	y = (((u16)(data[3] & mask) << 7) | (data[4] & 0x7f)) << shift;



	input_report_key(dev, BTN_TOUCH, data[0] & EGALAX_FORMAT_TOUCH_BIT);

	input_report_abs(dev, ABS_X, x);

	input_report_abs(dev, ABS_Y, y);

	input_sync(dev);

}



static irqreturn_t egalax_interrupt(struct serio *serio,

				    unsigned char data, unsigned int flags)

{

	struct egalax *egalax = serio_get_drvdata(serio);

	int pkt_len;



	egalax->data[egalax->idx++] = data;



	if (likely(egalax->data[0] & EGALAX_FORMAT_START_BIT)) {

		pkt_len = egalax->data[0] & EGALAX_FORMAT_PRESSURE_BIT ? 6 : 5;

		if (pkt_len == egalax->idx) {

			egalax_process_data(egalax);

			egalax->idx = 0;

		}

	} else {

		dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",

			egalax->data[0]);

		egalax->idx = 0;

	}



	return IRQ_HANDLED;

}



/*

 * egalax_connect() is the routine that is called when someone adds a

 * new serio device that supports egalax protocol and registers it as

 * an input device. This is usually accomplished using inputattach.

 */

static int egalax_connect(struct serio *serio, struct serio_driver *drv)

{

	struct egalax *egalax;

	struct input_dev *input_dev;

	int error;



	egalax = kzalloc(sizeof(struct egalax), GFP_KERNEL);

	input_dev = input_allocate_device();

	if (!egalax) {

		error = -ENOMEM;

		goto err_free_mem;

	}



	egalax->serio = serio;

	egalax->input = input_dev;

	snprintf(egalax->phys, sizeof(egalax->phys),

		 "%s/input0", serio->phys);



	input_dev->name = "EETI eGalaxTouch Serial TouchScreen";

	input_dev->phys = egalax->phys;

	input_dev->id.bustype = BUS_RS232;

	input_dev->id.vendor = SERIO_EGALAX;

	input_dev->id.product = 0;

	input_dev->id.version = 0x0001;

	input_dev->dev.parent = &serio->dev;



	input_set_capability(input_dev, EV_KEY, BTN_TOUCH);

	input_set_abs_params(input_dev, ABS_X,

			     EGALAX_MIN_XC, EGALAX_MAX_XC, 0, 0);

	input_set_abs_params(input_dev, ABS_Y,

			     EGALAX_MIN_YC, EGALAX_MAX_YC, 0, 0);



	serio_set_drvdata(serio, egalax);



	error = serio_open(serio, drv);

	if (error)

		goto err_reset_drvdata;



	error = input_register_device(input_dev);

	if (error)

		goto err_close_serio;



	return 0;



err_close_serio:

	serio_close(serio);

err_reset_drvdata:

	serio_set_drvdata(serio, NULL);

err_free_mem:

	input_free_device(input_dev);

	kfree(egalax);

	return error;

}



static void egalax_disconnect(struct serio *serio)

{

	struct egalax *egalax = serio_get_drvdata(serio);



	serio_close(serio);

	serio_set_drvdata(serio, NULL);

	input_unregister_device(egalax->input);

	kfree(egalax);

}



/*

 * The serio driver structure.

 */



static const struct serio_device_id egalax_serio_ids[] = {

	{

		.type	= SERIO_RS232,

		.proto	= SERIO_EGALAX,

		.id	= SERIO_ANY,

		.extra	= SERIO_ANY,

	},

	{ 0 }

};



MODULE_DEVICE_TABLE(serio, egalax_serio_ids);



static struct serio_driver egalax_drv = {

	.driver		= {

		.name	= "egalax",

	},

	.description	= DRIVER_DESC,

	.id_table	= egalax_serio_ids,

	.interrupt	= egalax_interrupt,

	.connect	= egalax_connect,

	.disconnect	= egalax_disconnect,

};

module_serio_driver(egalax_drv);



MODULE_AUTHOR("Zoltán Böszörményi <zboszor@pr.hu>");

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL v2");

include/uapi/linux/serio.h

+1 −0
Original line number Diff line number Diff line
@@ -77,5 +77,6 @@ 
#define SERIO_PS2MULT	0x3c

#define SERIO_TSC40	0x3d

#define SERIO_WACOM_IV	0x3e

#define SERIO_EGALAX	0x3f



#endif /* _UAPI_SERIO_H */