315 lines
6.5 KiB
C
315 lines
6.5 KiB
C
/*
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* Elo serial touchscreen driver
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*
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* Copyright (c) 2004 Vojtech Pavlik
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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/*
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* This driver can handle serial Elo touchscreens using either the Elo standard
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* 'E271-2210' 10-byte protocol, Elo legacy 'E281A-4002' 6-byte protocol, Elo
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* legacy 'E271-140' 4-byte protocol and Elo legacy 'E261-280' 3-byte protocol.
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*/
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/serio.h>
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#include <linux/init.h>
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#define DRIVER_DESC "Elo serial touchscreen driver"
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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/*
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* Definitions & global arrays.
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*/
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#define ELO_MAX_LENGTH 10
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/*
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* Per-touchscreen data.
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*/
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struct elo {
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struct input_dev *dev;
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struct serio *serio;
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int id;
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int idx;
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unsigned char csum;
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unsigned char data[ELO_MAX_LENGTH];
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char phys[32];
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};
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static void elo_process_data_10(struct elo* elo, unsigned char data, struct pt_regs *regs)
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{
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struct input_dev *dev = elo->dev;
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elo->csum += elo->data[elo->idx] = data;
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switch (elo->idx++) {
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case 0:
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if (data != 'U') {
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elo->idx = 0;
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elo->csum = 0;
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}
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break;
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case 1:
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if (data != 'T') {
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elo->idx = 0;
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elo->csum = 0;
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}
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break;
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case 9:
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if (elo->csum) {
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input_regs(dev, regs);
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input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]);
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input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]);
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input_report_abs(dev, ABS_PRESSURE, (elo->data[8] << 8) | elo->data[7]);
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input_report_key(dev, BTN_TOUCH, elo->data[8] || elo->data[7]);
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input_sync(dev);
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}
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elo->idx = 0;
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elo->csum = 0;
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break;
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}
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}
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static void elo_process_data_6(struct elo* elo, unsigned char data, struct pt_regs *regs)
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{
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struct input_dev *dev = elo->dev;
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elo->data[elo->idx] = data;
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switch (elo->idx++) {
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case 0: if ((data & 0xc0) != 0xc0) elo->idx = 0; break;
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case 1: if ((data & 0xc0) != 0x80) elo->idx = 0; break;
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case 2: if ((data & 0xc0) != 0x40) elo->idx = 0; break;
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case 3:
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if (data & 0xc0) {
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elo->idx = 0;
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break;
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}
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input_regs(dev, regs);
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input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) | (elo->data[1] & 0x3f));
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input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) | (elo->data[3] & 0x3f));
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if (elo->id == 2) {
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input_report_key(dev, BTN_TOUCH, 1);
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input_sync(dev);
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elo->idx = 0;
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}
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break;
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case 4:
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if (data) {
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input_sync(dev);
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elo->idx = 0;
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}
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break;
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case 5:
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if ((data & 0xf0) == 0) {
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input_report_abs(dev, ABS_PRESSURE, elo->data[5]);
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input_report_key(dev, BTN_TOUCH, !!elo->data[5]);
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}
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input_sync(dev);
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elo->idx = 0;
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break;
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}
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}
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static void elo_process_data_3(struct elo* elo, unsigned char data, struct pt_regs *regs)
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{
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struct input_dev *dev = elo->dev;
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elo->data[elo->idx] = data;
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switch (elo->idx++) {
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case 0:
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if ((data & 0x7f) != 0x01)
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elo->idx = 0;
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break;
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case 2:
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input_regs(dev, regs);
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input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80));
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input_report_abs(dev, ABS_X, elo->data[1]);
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input_report_abs(dev, ABS_Y, elo->data[2]);
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input_sync(dev);
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elo->idx = 0;
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break;
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}
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}
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static irqreturn_t elo_interrupt(struct serio *serio,
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unsigned char data, unsigned int flags, struct pt_regs *regs)
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{
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struct elo* elo = serio_get_drvdata(serio);
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switch(elo->id) {
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case 0:
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elo_process_data_10(elo, data, regs);
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break;
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case 1:
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case 2:
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elo_process_data_6(elo, data, regs);
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break;
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case 3:
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elo_process_data_3(elo, data, regs);
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break;
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}
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return IRQ_HANDLED;
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}
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/*
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* elo_disconnect() is the opposite of elo_connect()
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*/
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static void elo_disconnect(struct serio *serio)
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{
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struct elo* elo = serio_get_drvdata(serio);
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input_unregister_device(elo->dev);
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serio_close(serio);
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serio_set_drvdata(serio, NULL);
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kfree(elo);
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}
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/*
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* elo_connect() is the routine that is called when someone adds a
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* new serio device that supports Gunze protocol and registers it as
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* an input device.
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*/
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static int elo_connect(struct serio *serio, struct serio_driver *drv)
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{
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struct elo *elo;
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struct input_dev *input_dev;
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int err;
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elo = kzalloc(sizeof(struct elo), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!elo || !input_dev) {
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err = -ENOMEM;
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goto fail;
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}
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elo->serio = serio;
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elo->id = serio->id.id;
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elo->dev = input_dev;
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snprintf(elo->phys, sizeof(elo->phys), "%s/input0", serio->phys);
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input_dev->private = elo;
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input_dev->name = "Elo Serial TouchScreen";
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input_dev->phys = elo->phys;
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input_dev->id.bustype = BUS_RS232;
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input_dev->id.vendor = SERIO_ELO;
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input_dev->id.product = elo->id;
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input_dev->id.version = 0x0100;
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input_dev->cdev.dev = &serio->dev;
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input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
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input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
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switch (elo->id) {
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case 0: /* 10-byte protocol */
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input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
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input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0);
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break;
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case 1: /* 6-byte protocol */
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input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15, 0, 0);
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case 2: /* 4-byte protocol */
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input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
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break;
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case 3: /* 3-byte protocol */
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input_set_abs_params(input_dev, ABS_X, 0, 255, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, 0, 255, 0, 0);
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break;
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}
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serio_set_drvdata(serio, elo);
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err = serio_open(serio, drv);
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if (err)
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goto fail;
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input_register_device(elo->dev);
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return 0;
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fail: serio_set_drvdata(serio, NULL);
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input_free_device(input_dev);
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kfree(elo);
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return err;
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}
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/*
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* The serio driver structure.
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*/
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static struct serio_device_id elo_serio_ids[] = {
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{
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.type = SERIO_RS232,
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.proto = SERIO_ELO,
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.id = SERIO_ANY,
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.extra = SERIO_ANY,
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},
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{ 0 }
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};
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MODULE_DEVICE_TABLE(serio, elo_serio_ids);
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static struct serio_driver elo_drv = {
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.driver = {
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.name = "elo",
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},
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.description = DRIVER_DESC,
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.id_table = elo_serio_ids,
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.interrupt = elo_interrupt,
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.connect = elo_connect,
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.disconnect = elo_disconnect,
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};
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/*
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* The functions for inserting/removing us as a module.
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*/
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static int __init elo_init(void)
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{
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serio_register_driver(&elo_drv);
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return 0;
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}
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static void __exit elo_exit(void)
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{
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serio_unregister_driver(&elo_drv);
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}
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module_init(elo_init);
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module_exit(elo_exit);
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