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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) 2000-2001 Vojtech Pavlik
*/
/*
* Gunze AHL-51S touchscreen driver for Linux
*/
#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 "Gunze AHL-51S touchscreen driver"
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
/*
* Definitions & global arrays.
*/
#define GUNZE_MAX_LENGTH 10
/*
* Per-touchscreen data.
*/
struct gunze {
struct input_dev *dev;
struct serio *serio;
int idx;
unsigned char data[GUNZE_MAX_LENGTH];
char phys[32];
};
static void gunze_process_packet(struct gunze *gunze)
{
struct input_dev *dev = gunze->dev;
if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' ||
(gunze->data[0] != 'T' && gunze->data[0] != 'R')) {
printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data);
return;
}
input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));
input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));
input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');
input_sync(dev);
}
static irqreturn_t gunze_interrupt(struct serio *serio,
unsigned char data, unsigned int flags)
{
struct gunze *gunze = serio_get_drvdata(serio);
if (data == '\r') {
gunze_process_packet(gunze);
gunze->idx = 0;
} else {
if (gunze->idx < GUNZE_MAX_LENGTH)
gunze->data[gunze->idx++] = data;
}
return IRQ_HANDLED;
}
/*
* gunze_disconnect() is the opposite of gunze_connect()
*/
static void gunze_disconnect(struct serio *serio)
{
struct gunze *gunze = serio_get_drvdata(serio);
input_get_device(gunze->dev);
input_unregister_device(gunze->dev);
serio_close(serio);
serio_set_drvdata(serio, NULL);
input_put_device(gunze->dev);
kfree(gunze);
}
/*
* gunze_connect() is the routine that is called when someone adds a
* new serio device that supports Gunze protocol and registers it as
* an input device.
*/
static int gunze_connect(struct serio *serio, struct serio_driver *drv)
{
struct gunze *gunze;
struct input_dev *input_dev;
int err;
gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
input_dev = input_allocate_device();
if (!gunze || !input_dev) {
err = -ENOMEM;
goto fail1;
}
gunze->serio = serio;
gunze->dev = input_dev;
snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys);
input_dev->name = "Gunze AHL-51S TouchScreen";
input_dev->phys = gunze->phys;
input_dev->id.bustype = BUS_RS232;
input_dev->id.vendor = SERIO_GUNZE;
input_dev->id.product = 0x0051;
input_dev->id.version = 0x0100;
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(input_dev, ABS_X, 24, 1000, 0, 0);
input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0);
serio_set_drvdata(serio, gunze);
err = serio_open(serio, drv);
if (err)
goto fail2;
err = input_register_device(gunze->dev);
if (err)
goto fail3;
return 0;
fail3: serio_close(serio);
fail2: serio_set_drvdata(serio, NULL);
fail1: input_free_device(input_dev);
kfree(gunze);
return err;
}
/*
* The serio driver structure.
*/
static const struct serio_device_id gunze_serio_ids[] = {
{
.type = SERIO_RS232,
.proto = SERIO_GUNZE,
.id = SERIO_ANY,
.extra = SERIO_ANY,
},
{ 0 }
};
MODULE_DEVICE_TABLE(serio, gunze_serio_ids);
static struct serio_driver gunze_drv = {
.driver = {
.name = "gunze",
},
.description = DRIVER_DESC,
.id_table = gunze_serio_ids,
.interrupt = gunze_interrupt,
.connect = gunze_connect,
.disconnect = gunze_disconnect,
};
module_serio_driver(gunze_drv);
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