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Commit 422dee56 authored by Adam Bennett's avatar Adam Bennett Committed by Dmitry Torokhov
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Input: add driver for hampshire serial touchscreens 



Adds support for Hampshire TSHARC serial touchscreens.  Implements
Hampshire's 4-byte communication protocol.

Signed-off-by: default avatarAdam Bennett <abennett72@gmail.com>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent 6c04d7b3

drivers/input/touchscreen/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -119,6 +119,18 @@ config TOUCHSCREEN_DYNAPRO 
	  To compile this driver as a module, choose M here: the

	  module will be called dynapro.



config TOUCHSCREEN_HAMPSHIRE

	tristate "Hampshire serial touchscreen"

	select SERIO

	help

	  Say Y here if you have a Hampshire serial touchscreen connected to

	  your system.



	  If unsure, say N.



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

	  module will be called hampshire.



config TOUCHSCREEN_EETI

	tristate "EETI touchscreen panel support"

	depends on I2C

drivers/input/touchscreen/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ obj-$(CONFIG_TOUCHSCREEN_ADS7846) += ads7846.o 
obj-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC)	+= atmel_tsadcc.o

obj-$(CONFIG_TOUCHSCREEN_BITSY)		+= h3600_ts_input.o

obj-$(CONFIG_TOUCHSCREEN_DYNAPRO)	+= dynapro.o

obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE)	+= hampshire.o

obj-$(CONFIG_TOUCHSCREEN_GUNZE)		+= gunze.o

obj-$(CONFIG_TOUCHSCREEN_EETI)		+= eeti_ts.o

obj-$(CONFIG_TOUCHSCREEN_ELO)		+= elo.o

drivers/input/touchscreen/hampshire.c

0 → 100644
+205 −0
Original line number Diff line number Diff line 
/*

 * Hampshire serial touchscreen driver

 *

 * Copyright (c) 2010 Adam Bennett

 * Based on the dynapro driver (c) Tias Guns

 *

 */



/*

 * 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.

 */



/*

 * 2010/04/08 Adam Bennett <abennett72@gmail.com>

 *   Copied dynapro.c and edited for Hampshire 4-byte protocol

 */



#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/input.h>

#include <linux/serio.h>

#include <linux/init.h>



#define DRIVER_DESC	"Hampshire serial touchscreen driver"



MODULE_AUTHOR("Adam Bennett <abennett72@gmail.com>");

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");



/*

 * Definitions & global arrays.

 */



#define HAMPSHIRE_FORMAT_TOUCH_BIT 0x40

#define HAMPSHIRE_FORMAT_LENGTH 4

#define HAMPSHIRE_RESPONSE_BEGIN_BYTE 0x80



#define HAMPSHIRE_MIN_XC 0

#define HAMPSHIRE_MAX_XC 0x1000

#define HAMPSHIRE_MIN_YC 0

#define HAMPSHIRE_MAX_YC 0x1000



#define HAMPSHIRE_GET_XC(data) (((data[3] & 0x0c) >> 2) | (data[1] << 2) | ((data[0] & 0x38) << 6))

#define HAMPSHIRE_GET_YC(data) ((data[3] & 0x03) | (data[2] << 2) | ((data[0] & 0x07) << 9))

#define HAMPSHIRE_GET_TOUCHED(data) (HAMPSHIRE_FORMAT_TOUCH_BIT & data[0])



/*

 * Per-touchscreen data.

 */



struct hampshire {

	struct input_dev *dev;

	struct serio *serio;

	int idx;

	unsigned char data[HAMPSHIRE_FORMAT_LENGTH];

	char phys[32];

};



static void hampshire_process_data(struct hampshire *phampshire)

{

	struct input_dev *dev = phampshire->dev;



	if (HAMPSHIRE_FORMAT_LENGTH == ++phampshire->idx) {

		input_report_abs(dev, ABS_X, HAMPSHIRE_GET_XC(phampshire->data));

		input_report_abs(dev, ABS_Y, HAMPSHIRE_GET_YC(phampshire->data));

		input_report_key(dev, BTN_TOUCH,

				 HAMPSHIRE_GET_TOUCHED(phampshire->data));

		input_sync(dev);



		phampshire->idx = 0;

	}

}



static irqreturn_t hampshire_interrupt(struct serio *serio,

		unsigned char data, unsigned int flags)

{

	struct hampshire *phampshire = serio_get_drvdata(serio);



	phampshire->data[phampshire->idx] = data;



	if (HAMPSHIRE_RESPONSE_BEGIN_BYTE & phampshire->data[0])

		hampshire_process_data(phampshire);

	else

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

			phampshire->data[0]);



	return IRQ_HANDLED;

}



static void hampshire_disconnect(struct serio *serio)

{

	struct hampshire *phampshire = serio_get_drvdata(serio);



	input_get_device(phampshire->dev);

	input_unregister_device(phampshire->dev);

	serio_close(serio);

	serio_set_drvdata(serio, NULL);

	input_put_device(phampshire->dev);

	kfree(phampshire);

}



/*

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

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

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

 */



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

{

	struct hampshire *phampshire;

	struct input_dev *input_dev;

	int err;



	phampshire = kzalloc(sizeof(struct hampshire), GFP_KERNEL);

	input_dev = input_allocate_device();

	if (!phampshire || !input_dev) {

		err = -ENOMEM;

		goto fail1;

	}



	phampshire->serio = serio;

	phampshire->dev = input_dev;

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

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



	input_dev->name = "Hampshire Serial TouchScreen";

	input_dev->phys = phampshire->phys;

	input_dev->id.bustype = BUS_RS232;

	input_dev->id.vendor = SERIO_HAMPSHIRE;

	input_dev->id.product = 0;

	input_dev->id.version = 0x0001;

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

	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);

	input_set_abs_params(phampshire->dev, ABS_X,

			     HAMPSHIRE_MIN_XC, HAMPSHIRE_MAX_XC, 0, 0);

	input_set_abs_params(phampshire->dev, ABS_Y,

			     HAMPSHIRE_MIN_YC, HAMPSHIRE_MAX_YC, 0, 0);



	serio_set_drvdata(serio, phampshire);



	err = serio_open(serio, drv);

	if (err)

		goto fail2;



	err = input_register_device(phampshire->dev);

	if (err)

		goto fail3;



	return 0;



 fail3:	serio_close(serio);

 fail2:	serio_set_drvdata(serio, NULL);

 fail1:	input_free_device(input_dev);

	kfree(phampshire);

	return err;

}



/*

 * The serio driver structure.

 */



static struct serio_device_id hampshire_serio_ids[] = {

	{

		.type	= SERIO_RS232,

		.proto	= SERIO_HAMPSHIRE,

		.id	= SERIO_ANY,

		.extra	= SERIO_ANY,

	},

	{ 0 }

};



MODULE_DEVICE_TABLE(serio, hampshire_serio_ids);



static struct serio_driver hampshire_drv = {

	.driver		= {

		.name	= "hampshire",

	},

	.description	= DRIVER_DESC,

	.id_table	= hampshire_serio_ids,

	.interrupt	= hampshire_interrupt,

	.connect	= hampshire_connect,

	.disconnect	= hampshire_disconnect,

};



/*

 * The functions for inserting/removing us as a module.

 */



static int __init hampshire_init(void)

{

	return serio_register_driver(&hampshire_drv);

}



static void __exit hampshire_exit(void)

{

	serio_unregister_driver(&hampshire_drv);

}



module_init(hampshire_init);

module_exit(hampshire_exit);

include/linux/serio.h

+1 −0
Original line number Diff line number Diff line
@@ -196,5 +196,6 @@ static inline void serio_continue_rx(struct serio *serio) 
#define SERIO_TOUCHIT213	0x38

#define SERIO_W8001	0x39

#define SERIO_DYNAPRO	0x3a

#define SERIO_HAMPSHIRE	0x3b



#endif