175 lines
3.7 KiB
C
175 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Touchright serial touchscreen driver
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*
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* Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
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*
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* Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c)
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* Copyright (c) 2004 Vojtech Pavlik
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* and Dan Streetman <ddstreet@ieee.org>
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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 "Touchright serial touchscreen driver"
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MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
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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 TR_FORMAT_TOUCH_BIT 0x01
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#define TR_FORMAT_STATUS_BYTE 0x40
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#define TR_FORMAT_STATUS_MASK ~TR_FORMAT_TOUCH_BIT
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#define TR_LENGTH 5
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#define TR_MIN_XC 0
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#define TR_MAX_XC 0x1ff
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#define TR_MIN_YC 0
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#define TR_MAX_YC 0x1ff
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/*
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* Per-touchscreen data.
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*/
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struct tr {
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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[TR_LENGTH];
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char phys[32];
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};
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static irqreturn_t tr_interrupt(struct serio *serio,
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unsigned char data, unsigned int flags)
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{
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struct tr *tr = serio_get_drvdata(serio);
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struct input_dev *dev = tr->dev;
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tr->data[tr->idx] = data;
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if ((tr->data[0] & TR_FORMAT_STATUS_MASK) == TR_FORMAT_STATUS_BYTE) {
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if (++tr->idx == TR_LENGTH) {
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input_report_abs(dev, ABS_X,
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(tr->data[1] << 5) | (tr->data[2] >> 1));
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input_report_abs(dev, ABS_Y,
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(tr->data[3] << 5) | (tr->data[4] >> 1));
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input_report_key(dev, BTN_TOUCH,
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tr->data[0] & TR_FORMAT_TOUCH_BIT);
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input_sync(dev);
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tr->idx = 0;
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}
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}
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return IRQ_HANDLED;
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}
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/*
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* tr_disconnect() is the opposite of tr_connect()
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*/
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static void tr_disconnect(struct serio *serio)
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{
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struct tr *tr = serio_get_drvdata(serio);
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input_get_device(tr->dev);
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input_unregister_device(tr->dev);
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serio_close(serio);
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serio_set_drvdata(serio, NULL);
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input_put_device(tr->dev);
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kfree(tr);
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}
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/*
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* tr_connect() is the routine that is called when someone adds a
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* new serio device that supports the Touchright protocol and registers it as
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* an input device.
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*/
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static int tr_connect(struct serio *serio, struct serio_driver *drv)
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{
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struct tr *tr;
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struct input_dev *input_dev;
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int err;
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tr = kzalloc(sizeof(struct tr), GFP_KERNEL);
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input_dev = input_allocate_device();
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if (!tr || !input_dev) {
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err = -ENOMEM;
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goto fail1;
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}
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tr->serio = serio;
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tr->dev = input_dev;
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snprintf(tr->phys, sizeof(tr->phys), "%s/input0", serio->phys);
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input_dev->name = "Touchright Serial TouchScreen";
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input_dev->phys = tr->phys;
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input_dev->id.bustype = BUS_RS232;
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input_dev->id.vendor = SERIO_TOUCHRIGHT;
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input_dev->id.product = 0;
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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(tr->dev, ABS_X, TR_MIN_XC, TR_MAX_XC, 0, 0);
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input_set_abs_params(tr->dev, ABS_Y, TR_MIN_YC, TR_MAX_YC, 0, 0);
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serio_set_drvdata(serio, tr);
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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(tr->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(tr);
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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 tr_serio_ids[] = {
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{
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.type = SERIO_RS232,
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.proto = SERIO_TOUCHRIGHT,
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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, tr_serio_ids);
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static struct serio_driver tr_drv = {
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.driver = {
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.name = "touchright",
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},
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.description = DRIVER_DESC,
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.id_table = tr_serio_ids,
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.interrupt = tr_interrupt,
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.connect = tr_connect,
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.disconnect = tr_disconnect,
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};
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module_serio_driver(tr_drv);
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