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/*
* MicroTouch (3M) serial touchscreen driver
*
* Copyright (c) 2004 Vojtech Pavlik
*/
/*
* 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.
*/
/*
* 2005/02/19 Dan Streetman <ddstreet@ieee.org>
* Copied elo.c and edited for MicroTouch 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 "MicroTouch serial touchscreen driver"
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
/*
* Definitions & global arrays.
*/
#define MTOUCH_FORMAT_TABLET_STATUS_BIT 0x80
#define MTOUCH_FORMAT_TABLET_TOUCH_BIT 0x40
#define MTOUCH_FORMAT_TABLET_LENGTH 5
#define MTOUCH_RESPONSE_BEGIN_BYTE 0x01
#define MTOUCH_RESPONSE_END_BYTE 0x0d
/* todo: check specs for max length of all responses */
#define MTOUCH_MAX_LENGTH 16
#define MTOUCH_MIN_XC 0
#define MTOUCH_MAX_XC 0x3fff
#define MTOUCH_MIN_YC 0
#define MTOUCH_MAX_YC 0x3fff
#define MTOUCH_GET_XC(data) (((data[2])<<7) | data[1])
#define MTOUCH_GET_YC(data) (((data[4])<<7) | data[3])
#define MTOUCH_GET_TOUCHED(data) (MTOUCH_FORMAT_TABLET_TOUCH_BIT & data[0])
/*
* Per-touchscreen data.
*/
struct mtouch {
struct input_dev *dev;
struct serio *serio;
int idx;
unsigned char data[MTOUCH_MAX_LENGTH];
char phys[32];
};
static void mtouch_process_format_tablet(struct mtouch *mtouch)
{
struct input_dev *dev = mtouch->dev;
if (MTOUCH_FORMAT_TABLET_LENGTH == ++mtouch->idx) {
input_report_abs(dev, ABS_X, MTOUCH_GET_XC(mtouch->data));
input_report_abs(dev, ABS_Y, MTOUCH_MAX_YC - MTOUCH_GET_YC(mtouch->data));
input_report_key(dev, BTN_TOUCH, MTOUCH_GET_TOUCHED(mtouch->data));
input_sync(dev);
mtouch->idx = 0;
}
}
static void mtouch_process_response(struct mtouch *mtouch)
{
if (MTOUCH_RESPONSE_END_BYTE == mtouch->data[mtouch->idx++]) {
/* FIXME - process response */
mtouch->idx = 0;
} else if (MTOUCH_MAX_LENGTH == mtouch->idx) {
printk(KERN_ERR "mtouch.c: too many response bytes\n");
mtouch->idx = 0;
}
}
static irqreturn_t mtouch_interrupt(struct serio *serio,
unsigned char data, unsigned int flags)
{
struct mtouch* mtouch = serio_get_drvdata(serio);
mtouch->data[mtouch->idx] = data;
if (MTOUCH_FORMAT_TABLET_STATUS_BIT & mtouch->data[0])
mtouch_process_format_tablet(mtouch);
else if (MTOUCH_RESPONSE_BEGIN_BYTE == mtouch->data[0])
mtouch_process_response(mtouch);
else
printk(KERN_DEBUG "mtouch.c: unknown/unsynchronized data from device, byte %x\n",mtouch->data[0]);
return IRQ_HANDLED;
}
/*
* mtouch_disconnect() is the opposite of mtouch_connect()
*/
static void mtouch_disconnect(struct serio *serio)
{
struct mtouch* mtouch = serio_get_drvdata(serio);
input_get_device(mtouch->dev);
input_unregister_device(mtouch->dev);
serio_close(serio);
serio_set_drvdata(serio, NULL);
input_put_device(mtouch->dev);
kfree(mtouch);
}
/*
* mtouch_connect() is the routine that is called when someone adds a
* new serio device that supports MicroTouch (Format Tablet) protocol and registers it as
* an input device.
*/
static int mtouch_connect(struct serio *serio, struct serio_driver *drv)
{
struct mtouch *mtouch;
struct input_dev *input_dev;
int err;
mtouch = kzalloc(sizeof(struct mtouch), GFP_KERNEL);
input_dev = input_allocate_device();
if (!mtouch || !input_dev) {
err = -ENOMEM;
goto fail;
}
mtouch->serio = serio;
mtouch->dev = input_dev;
snprintf(mtouch->phys, sizeof(mtouch->phys), "%s/input0", serio->phys);
input_dev->private = mtouch;
input_dev->name = "MicroTouch Serial TouchScreen";
input_dev->phys = mtouch->phys;
input_dev->id.bustype = BUS_RS232;
input_dev->id.vendor = SERIO_MICROTOUCH;
input_dev->id.product = 0;
input_dev->id.version = 0x0100;
input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
input_set_abs_params(mtouch->dev, ABS_X, MTOUCH_MIN_XC, MTOUCH_MAX_XC, 0, 0);
input_set_abs_params(mtouch->dev, ABS_Y, MTOUCH_MIN_YC, MTOUCH_MAX_YC, 0, 0);
serio_set_drvdata(serio, mtouch);
err = serio_open(serio, drv);
if (err)
goto fail;
input_register_device(mtouch->dev);
return 0;
fail: serio_set_drvdata(serio, NULL);
input_free_device(input_dev);
kfree(mtouch);
return err;
}
/*
* The serio driver structure.
*/
static struct serio_device_id mtouch_serio_ids[] = {
{
.type = SERIO_RS232,
.proto = SERIO_MICROTOUCH,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{ 0 }
};
MODULE_DEVICE_TABLE(serio, mtouch_serio_ids);
static struct serio_driver mtouch_drv = {
.driver = {
.name = "mtouch",
},
.description = DRIVER_DESC,
.id_table = mtouch_serio_ids,
.interrupt = mtouch_interrupt,
.connect = mtouch_connect,
.disconnect = mtouch_disconnect,
};
/*
* The functions for inserting/removing us as a module.
*/
static int __init mtouch_init(void)
{
serio_register_driver(&mtouch_drv);
return 0;
}
static void __exit mtouch_exit(void)
{
serio_unregister_driver(&mtouch_drv);
}
module_init(mtouch_init);
module_exit(mtouch_exit);
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