185 lines
4.4 KiB
C
185 lines
4.4 KiB
C
/*
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* Copyright (c) 2000-2001 Vojtech Pavlik
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*/
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/*
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* Gunze AHL-51S touchscreen driver for Linux
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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#define DRIVER_DESC "Gunze AHL-51S 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 GUNZE_MAX_LENGTH 10
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/*
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* Per-touchscreen data.
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*/
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struct gunze {
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struct input_dev *dev;
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struct serio *serio;
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int idx;
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unsigned char data[GUNZE_MAX_LENGTH];
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char phys[32];
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};
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static void gunze_process_packet(struct gunze* gunze)
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{
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struct input_dev *dev = gunze->dev;
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if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' ||
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(gunze->data[0] != 'T' && gunze->data[0] != 'R')) {
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printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data);
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return;
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}
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input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));
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input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));
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input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');
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input_sync(dev);
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}
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static irqreturn_t gunze_interrupt(struct serio *serio,
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unsigned char data, unsigned int flags)
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{
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struct gunze* gunze = serio_get_drvdata(serio);
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if (data == '\r') {
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gunze_process_packet(gunze);
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gunze->idx = 0;
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} else {
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if (gunze->idx < GUNZE_MAX_LENGTH)
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gunze->data[gunze->idx++] = data;
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}
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return IRQ_HANDLED;
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}
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/*
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* gunze_disconnect() is the opposite of gunze_connect()
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*/
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static void gunze_disconnect(struct serio *serio)
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{
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struct gunze *gunze = serio_get_drvdata(serio);
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input_get_device(gunze->dev);
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input_unregister_device(gunze->dev);
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serio_close(serio);
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serio_set_drvdata(serio, NULL);
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input_put_device(gunze->dev);
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kfree(gunze);
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}
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/*
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* gunze_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 gunze_connect(struct serio *serio, struct serio_driver *drv)
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{
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struct gunze *gunze;
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struct input_dev *input_dev;
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int err;
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gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!gunze || !input_dev) {
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err = -ENOMEM;
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goto fail1;
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}
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gunze->serio = serio;
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gunze->dev = input_dev;
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snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys);
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input_dev->name = "Gunze AHL-51S TouchScreen";
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input_dev->phys = gunze->phys;
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input_dev->id.bustype = BUS_RS232;
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input_dev->id.vendor = SERIO_GUNZE;
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input_dev->id.product = 0x0051;
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input_dev->id.version = 0x0100;
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input_dev->dev.parent = &serio->dev;
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input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0);
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input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0);
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serio_set_drvdata(serio, gunze);
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err = serio_open(serio, drv);
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if (err)
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goto fail2;
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err = input_register_device(gunze->dev);
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if (err)
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goto fail3;
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return 0;
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fail3: serio_close(serio);
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fail2: serio_set_drvdata(serio, NULL);
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fail1: input_free_device(input_dev);
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kfree(gunze);
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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 const struct serio_device_id gunze_serio_ids[] = {
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{
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.type = SERIO_RS232,
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.proto = SERIO_GUNZE,
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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, gunze_serio_ids);
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static struct serio_driver gunze_drv = {
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.driver = {
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.name = "gunze",
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},
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.description = DRIVER_DESC,
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.id_table = gunze_serio_ids,
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.interrupt = gunze_interrupt,
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.connect = gunze_connect,
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.disconnect = gunze_disconnect,
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};
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module_serio_driver(gunze_drv);
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