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touchright.c

/*
 * Touchright serial touchscreen driver
 *
 * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
 *
 * Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c)
 * Copyright (c) 2004 Vojtech Pavlik
 * and Dan Streetman <ddstreet@ieee.org>
 */

/*
 * 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.
 */

#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     "Touchright serial touchscreen driver"

MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

/*
 * Definitions & global arrays.
 */

#define TR_FORMAT_TOUCH_BIT   0x01
#define TR_FORMAT_STATUS_BYTE 0x40
#define TR_FORMAT_STATUS_MASK ~TR_FORMAT_TOUCH_BIT

#define TR_LENGTH 5

#define TR_MIN_XC 0
#define TR_MAX_XC 0x1ff
#define TR_MIN_YC 0
#define TR_MAX_YC 0x1ff

/*
 * Per-touchscreen data.
 */

struct tr {
      struct input_dev *dev;
      struct serio *serio;
      int idx;
      unsigned char data[TR_LENGTH];
      char phys[32];
};

static irqreturn_t tr_interrupt(struct serio *serio,
            unsigned char data, unsigned int flags)
{
      struct tr *tr = serio_get_drvdata(serio);
      struct input_dev *dev = tr->dev;

      tr->data[tr->idx] = data;

      if ((tr->data[0] & TR_FORMAT_STATUS_MASK) == TR_FORMAT_STATUS_BYTE) {
            if (++tr->idx == TR_LENGTH) {
                  input_report_abs(dev, ABS_X,
                        (tr->data[1] << 5) | (tr->data[2] >> 1));
                  input_report_abs(dev, ABS_Y,
                        (tr->data[3] << 5) | (tr->data[4] >> 1));
                  input_report_key(dev, BTN_TOUCH,
                        tr->data[0] & TR_FORMAT_TOUCH_BIT);
                  input_sync(dev);
                  tr->idx = 0;
            }
      }

      return IRQ_HANDLED;
}

/*
 * tr_disconnect() is the opposite of tr_connect()
 */

static void tr_disconnect(struct serio *serio)
{
      struct tr *tr = serio_get_drvdata(serio);

      input_get_device(tr->dev);
      input_unregister_device(tr->dev);
      serio_close(serio);
      serio_set_drvdata(serio, NULL);
      input_put_device(tr->dev);
      kfree(tr);
}

/*
 * tr_connect() is the routine that is called when someone adds a
 * new serio device that supports the Touchright protocol and registers it as
 * an input device.
 */

static int tr_connect(struct serio *serio, struct serio_driver *drv)
{
      struct tr *tr;
      struct input_dev *input_dev;
      int err;

      tr = kzalloc(sizeof(struct tr), GFP_KERNEL);
      input_dev = input_allocate_device();
      if (!tr || !input_dev) {
            err = -ENOMEM;
            goto fail1;
      }

      tr->serio = serio;
      tr->dev = input_dev;
      snprintf(tr->phys, sizeof(tr->phys), "%s/input0", serio->phys);

      input_dev->name = "Touchright Serial TouchScreen";
      input_dev->phys = tr->phys;
      input_dev->id.bustype = BUS_RS232;
      input_dev->id.vendor = SERIO_TOUCHRIGHT;
      input_dev->id.product = 0;
      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(tr->dev, ABS_X, TR_MIN_XC, TR_MAX_XC, 0, 0);
      input_set_abs_params(tr->dev, ABS_Y, TR_MIN_YC, TR_MAX_YC, 0, 0);

      serio_set_drvdata(serio, tr);

      err = serio_open(serio, drv);
      if (err)
            goto fail2;

      err = input_register_device(tr->dev);
      if (err)
            goto fail3;

      return 0;

 fail3:     serio_close(serio);
 fail2:     serio_set_drvdata(serio, NULL);
 fail1:     input_free_device(input_dev);
      kfree(tr);
      return err;
}

/*
 * The serio driver structure.
 */

static struct serio_device_id tr_serio_ids[] = {
      {
            .type = SERIO_RS232,
            .proto      = SERIO_TOUCHRIGHT,
            .id   = SERIO_ANY,
            .extra      = SERIO_ANY,
      },
      { 0 }
};

MODULE_DEVICE_TABLE(serio, tr_serio_ids);

static struct serio_driver tr_drv = {
      .driver           = {
            .name = "touchright",
      },
      .description      = DRIVER_DESC,
      .id_table   = tr_serio_ids,
      .interrupt  = tr_interrupt,
      .connect    = tr_connect,
      .disconnect = tr_disconnect,
};

/*
 * The functions for inserting/removing us as a module.
 */

static int __init tr_init(void)
{
      return serio_register_driver(&tr_drv);
}

static void __exit tr_exit(void)
{
      serio_unregister_driver(&tr_drv);
}

module_init(tr_init);
module_exit(tr_exit);

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