316 lines
6.4 KiB
C
316 lines
6.4 KiB
C
/*
|
|
* Elo 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.
|
|
*/
|
|
|
|
/*
|
|
* This driver can handle serial Elo touchscreens using either the Elo standard
|
|
* 'E271-2210' 10-byte protocol, Elo legacy 'E281A-4002' 6-byte protocol, Elo
|
|
* legacy 'E271-140' 4-byte protocol and Elo legacy 'E261-280' 3-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 "Elo serial touchscreen driver"
|
|
|
|
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
/*
|
|
* Definitions & global arrays.
|
|
*/
|
|
|
|
#define ELO_MAX_LENGTH 10
|
|
|
|
static char *elo_name = "Elo Serial TouchScreen";
|
|
|
|
/*
|
|
* Per-touchscreen data.
|
|
*/
|
|
|
|
struct elo {
|
|
struct input_dev dev;
|
|
struct serio *serio;
|
|
int id;
|
|
int idx;
|
|
unsigned char csum;
|
|
unsigned char data[ELO_MAX_LENGTH];
|
|
char phys[32];
|
|
};
|
|
|
|
static void elo_process_data_10(struct elo* elo, unsigned char data, struct pt_regs *regs)
|
|
{
|
|
struct input_dev *dev = &elo->dev;
|
|
|
|
elo->csum += elo->data[elo->idx] = data;
|
|
|
|
switch (elo->idx++) {
|
|
|
|
case 0:
|
|
if (data != 'U') {
|
|
elo->idx = 0;
|
|
elo->csum = 0;
|
|
}
|
|
break;
|
|
|
|
case 1:
|
|
if (data != 'T') {
|
|
elo->idx = 0;
|
|
elo->csum = 0;
|
|
}
|
|
break;
|
|
|
|
case 9:
|
|
if (elo->csum) {
|
|
input_regs(dev, regs);
|
|
input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]);
|
|
input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]);
|
|
input_report_abs(dev, ABS_PRESSURE, (elo->data[8] << 8) | elo->data[7]);
|
|
input_report_key(dev, BTN_TOUCH, elo->data[2] & 3);
|
|
input_sync(dev);
|
|
}
|
|
elo->idx = 0;
|
|
elo->csum = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void elo_process_data_6(struct elo* elo, unsigned char data, struct pt_regs *regs)
|
|
{
|
|
struct input_dev *dev = &elo->dev;
|
|
|
|
elo->data[elo->idx] = data;
|
|
|
|
switch (elo->idx++) {
|
|
|
|
case 0: if ((data & 0xc0) != 0xc0) elo->idx = 0; break;
|
|
case 1: if ((data & 0xc0) != 0x80) elo->idx = 0; break;
|
|
case 2: if ((data & 0xc0) != 0x40) elo->idx = 0; break;
|
|
|
|
case 3:
|
|
if (data & 0xc0) {
|
|
elo->idx = 0;
|
|
break;
|
|
}
|
|
|
|
input_regs(dev, regs);
|
|
input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) | (elo->data[1] & 0x3f));
|
|
input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) | (elo->data[3] & 0x3f));
|
|
|
|
if (elo->id == 2) {
|
|
input_report_key(dev, BTN_TOUCH, 1);
|
|
input_sync(dev);
|
|
elo->idx = 0;
|
|
}
|
|
|
|
break;
|
|
|
|
case 4:
|
|
if (data) {
|
|
input_sync(dev);
|
|
elo->idx = 0;
|
|
}
|
|
break;
|
|
|
|
case 5:
|
|
if ((data & 0xf0) == 0) {
|
|
input_report_abs(dev, ABS_PRESSURE, elo->data[5]);
|
|
input_report_key(dev, BTN_TOUCH, elo->data[5]);
|
|
}
|
|
input_sync(dev);
|
|
elo->idx = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void elo_process_data_3(struct elo* elo, unsigned char data, struct pt_regs *regs)
|
|
{
|
|
struct input_dev *dev = &elo->dev;
|
|
|
|
elo->data[elo->idx] = data;
|
|
|
|
switch (elo->idx++) {
|
|
|
|
case 0:
|
|
if ((data & 0x7f) != 0x01)
|
|
elo->idx = 0;
|
|
break;
|
|
case 2:
|
|
input_regs(dev, regs);
|
|
input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80));
|
|
input_report_abs(dev, ABS_X, elo->data[1]);
|
|
input_report_abs(dev, ABS_Y, elo->data[2]);
|
|
input_sync(dev);
|
|
elo->idx = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
static irqreturn_t elo_interrupt(struct serio *serio,
|
|
unsigned char data, unsigned int flags, struct pt_regs *regs)
|
|
{
|
|
struct elo* elo = serio_get_drvdata(serio);
|
|
|
|
switch(elo->id) {
|
|
case 0:
|
|
elo_process_data_10(elo, data, regs);
|
|
break;
|
|
|
|
case 1:
|
|
case 2:
|
|
elo_process_data_6(elo, data, regs);
|
|
break;
|
|
|
|
case 3:
|
|
elo_process_data_3(elo, data, regs);
|
|
break;
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* elo_disconnect() is the opposite of elo_connect()
|
|
*/
|
|
|
|
static void elo_disconnect(struct serio *serio)
|
|
{
|
|
struct elo* elo = serio_get_drvdata(serio);
|
|
|
|
input_unregister_device(&elo->dev);
|
|
serio_close(serio);
|
|
serio_set_drvdata(serio, NULL);
|
|
kfree(elo);
|
|
}
|
|
|
|
/*
|
|
* elo_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 elo_connect(struct serio *serio, struct serio_driver *drv)
|
|
{
|
|
struct elo *elo;
|
|
int err;
|
|
|
|
if (!(elo = kmalloc(sizeof(struct elo), GFP_KERNEL)))
|
|
return -ENOMEM;
|
|
|
|
memset(elo, 0, sizeof(struct elo));
|
|
|
|
init_input_dev(&elo->dev);
|
|
elo->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
|
|
elo->dev.keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
|
|
|
|
elo->id = serio->id.id;
|
|
|
|
switch (elo->id) {
|
|
|
|
case 0: /* 10-byte protocol */
|
|
input_set_abs_params(&elo->dev, ABS_X, 96, 4000, 0, 0);
|
|
input_set_abs_params(&elo->dev, ABS_Y, 96, 4000, 0, 0);
|
|
input_set_abs_params(&elo->dev, ABS_PRESSURE, 0, 255, 0, 0);
|
|
break;
|
|
|
|
case 1: /* 6-byte protocol */
|
|
input_set_abs_params(&elo->dev, ABS_PRESSURE, 0, 15, 0, 0);
|
|
|
|
case 2: /* 4-byte protocol */
|
|
input_set_abs_params(&elo->dev, ABS_X, 96, 4000, 0, 0);
|
|
input_set_abs_params(&elo->dev, ABS_Y, 96, 4000, 0, 0);
|
|
break;
|
|
|
|
case 3: /* 3-byte protocol */
|
|
input_set_abs_params(&elo->dev, ABS_X, 0, 255, 0, 0);
|
|
input_set_abs_params(&elo->dev, ABS_Y, 0, 255, 0, 0);
|
|
break;
|
|
}
|
|
|
|
elo->serio = serio;
|
|
|
|
sprintf(elo->phys, "%s/input0", serio->phys);
|
|
|
|
elo->dev.private = elo;
|
|
elo->dev.name = elo_name;
|
|
elo->dev.phys = elo->phys;
|
|
elo->dev.id.bustype = BUS_RS232;
|
|
elo->dev.id.vendor = SERIO_ELO;
|
|
elo->dev.id.product = elo->id;
|
|
elo->dev.id.version = 0x0100;
|
|
|
|
serio_set_drvdata(serio, elo);
|
|
|
|
err = serio_open(serio, drv);
|
|
if (err) {
|
|
serio_set_drvdata(serio, NULL);
|
|
kfree(elo);
|
|
return err;
|
|
}
|
|
|
|
input_register_device(&elo->dev);
|
|
|
|
printk(KERN_INFO "input: %s on %s\n", elo_name, serio->phys);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The serio driver structure.
|
|
*/
|
|
|
|
static struct serio_device_id elo_serio_ids[] = {
|
|
{
|
|
.type = SERIO_RS232,
|
|
.proto = SERIO_ELO,
|
|
.id = SERIO_ANY,
|
|
.extra = SERIO_ANY,
|
|
},
|
|
{ 0 }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(serio, elo_serio_ids);
|
|
|
|
static struct serio_driver elo_drv = {
|
|
.driver = {
|
|
.name = "elo",
|
|
},
|
|
.description = DRIVER_DESC,
|
|
.id_table = elo_serio_ids,
|
|
.interrupt = elo_interrupt,
|
|
.connect = elo_connect,
|
|
.disconnect = elo_disconnect,
|
|
};
|
|
|
|
/*
|
|
* The functions for inserting/removing us as a module.
|
|
*/
|
|
|
|
static int __init elo_init(void)
|
|
{
|
|
serio_register_driver(&elo_drv);
|
|
return 0;
|
|
}
|
|
|
|
static void __exit elo_exit(void)
|
|
{
|
|
serio_unregister_driver(&elo_drv);
|
|
}
|
|
|
|
module_init(elo_init);
|
|
module_exit(elo_exit);
|