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// SPDX-License-Identifier: GPL-2.0-only
/*
* Dynapro serial touchscreen driver
*
* Copyright (c) 2009 Tias Guns
* Based on the inexio driver (c) Vojtech Pavlik and Dan Streetman and
* Richard Lemon
*/
/*
* 2009/09/19 Tias Guns <tias@ulyssis.org>
* Copied inexio.c and edited for Dynapro protocol (from retired Xorg module)
*/
#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 "Dynapro serial touchscreen driver"
MODULE_AUTHOR("Tias Guns <tias@ulyssis.org>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
/*
* Definitions & global arrays.
*/
#define DYNAPRO_FORMAT_TOUCH_BIT 0x40
#define DYNAPRO_FORMAT_LENGTH 3
#define DYNAPRO_RESPONSE_BEGIN_BYTE 0x80
#define DYNAPRO_MIN_XC 0
#define DYNAPRO_MAX_XC 0x3ff
#define DYNAPRO_MIN_YC 0
#define DYNAPRO_MAX_YC 0x3ff
#define DYNAPRO_GET_XC(data) (data[1] | ((data[0] & 0x38) << 4))
#define DYNAPRO_GET_YC(data) (data[2] | ((data[0] & 0x07) << 7))
#define DYNAPRO_GET_TOUCHED(data) (DYNAPRO_FORMAT_TOUCH_BIT & data[0])
/*
* Per-touchscreen data.
*/
struct dynapro {
struct input_dev *dev;
struct serio *serio;
int idx;
unsigned char data[DYNAPRO_FORMAT_LENGTH];
char phys[32];
};
static void dynapro_process_data(struct dynapro *pdynapro)
{
struct input_dev *dev = pdynapro->dev;
if (DYNAPRO_FORMAT_LENGTH == ++pdynapro->idx) {
input_report_abs(dev, ABS_X, DYNAPRO_GET_XC(pdynapro->data));
input_report_abs(dev, ABS_Y, DYNAPRO_GET_YC(pdynapro->data));
input_report_key(dev, BTN_TOUCH,
DYNAPRO_GET_TOUCHED(pdynapro->data));
input_sync(dev);
pdynapro->idx = 0;
}
}
static irqreturn_t dynapro_interrupt(struct serio *serio,
unsigned char data, unsigned int flags)
{
struct dynapro *pdynapro = serio_get_drvdata(serio);
pdynapro->data[pdynapro->idx] = data;
if (DYNAPRO_RESPONSE_BEGIN_BYTE & pdynapro->data[0])
dynapro_process_data(pdynapro);
else
dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
pdynapro->data[0]);
return IRQ_HANDLED;
}
static void dynapro_disconnect(struct serio *serio)
{
struct dynapro *pdynapro = serio_get_drvdata(serio);
input_get_device(pdynapro->dev);
input_unregister_device(pdynapro->dev);
serio_close(serio);
serio_set_drvdata(serio, NULL);
input_put_device(pdynapro->dev);
kfree(pdynapro);
}
/*
* dynapro_connect() is the routine that is called when someone adds a
* new serio device that supports dynapro protocol and registers it as
* an input device. This is usually accomplished using inputattach.
*/
static int dynapro_connect(struct serio *serio, struct serio_driver *drv)
{
struct dynapro *pdynapro;
struct input_dev *input_dev;
int err;
pdynapro = kzalloc(sizeof(struct dynapro), GFP_KERNEL);
input_dev = input_allocate_device();
if (!pdynapro || !input_dev) {
err = -ENOMEM;
goto fail1;
}
pdynapro->serio = serio;
pdynapro->dev = input_dev;
snprintf(pdynapro->phys, sizeof(pdynapro->phys),
"%s/input0", serio->phys);
input_dev->name = "Dynapro Serial TouchScreen";
input_dev->phys = pdynapro->phys;
input_dev->id.bustype = BUS_RS232;
input_dev->id.vendor = SERIO_DYNAPRO;
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(pdynapro->dev, ABS_X,
DYNAPRO_MIN_XC, DYNAPRO_MAX_XC, 0, 0);
input_set_abs_params(pdynapro->dev, ABS_Y,
DYNAPRO_MIN_YC, DYNAPRO_MAX_YC, 0, 0);
serio_set_drvdata(serio, pdynapro);
err = serio_open(serio, drv);
if (err)
goto fail2;
err = input_register_device(pdynapro->dev);
if (err)
goto fail3;
return 0;
fail3: serio_close(serio);
fail2: serio_set_drvdata(serio, NULL);
fail1: input_free_device(input_dev);
kfree(pdynapro);
return err;
}
/*
* The serio driver structure.
*/
static const struct serio_device_id dynapro_serio_ids[] = {
{
.type = SERIO_RS232,
.proto = SERIO_DYNAPRO,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{ 0 }
};
MODULE_DEVICE_TABLE(serio, dynapro_serio_ids);
static struct serio_driver dynapro_drv = {
.driver = {
.name = "dynapro",
},
.description = DRIVER_DESC,
.id_table = dynapro_serio_ids,
.interrupt = dynapro_interrupt,
.connect = dynapro_connect,
.disconnect = dynapro_disconnect,
};
module_serio_driver(dynapro_drv);
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