text: /*
   * 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->private = tr;
  	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->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
  	input_dev->keybit[LONG(BTN_TOUCH)] = BIT(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);
  