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penmount.c

/*
 * Penmount serial touchscreen driver
 *
 * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
 *
 * Based on ELO driver (drivers/input/touchscreen/elo.c)
 * Copyright (c) 2004 Vojtech Pavlik
 */

/*
 * 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     "Penmount serial touchscreen driver"

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

/*
 * Definitions & global arrays.
 */

#define     PM_MAX_LENGTH     5

/*
 * Per-touchscreen data.
 */

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

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

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

      if (pm->data[0] & 0x80) {
            if (PM_MAX_LENGTH == ++pm->idx) {
                  input_report_abs(dev, ABS_X, pm->data[2] * 128 + pm->data[1]);
                  input_report_abs(dev, ABS_Y, pm->data[4] * 128 + pm->data[3]);
                  input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40));
                  input_sync(dev);
                  pm->idx = 0;
            }
      }

      return IRQ_HANDLED;
}

/*
 * pm_disconnect() is the opposite of pm_connect()
 */

static void pm_disconnect(struct serio *serio)
{
      struct pm *pm = serio_get_drvdata(serio);

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

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

static int pm_connect(struct serio *serio, struct serio_driver *drv)
{
      struct pm *pm;
      struct input_dev *input_dev;
      int err;

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

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

      input_dev->name = "Penmount Serial TouchScreen";
      input_dev->phys = pm->phys;
      input_dev->id.bustype = BUS_RS232;
      input_dev->id.vendor = SERIO_PENMOUNT;
      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(pm->dev, ABS_X, 0, 0x3ff, 0, 0);
        input_set_abs_params(pm->dev, ABS_Y, 0, 0x3ff, 0, 0);

      serio_set_drvdata(serio, pm);

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

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

      return 0;

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

/*
 * The serio driver structure.
 */

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

MODULE_DEVICE_TABLE(serio, pm_serio_ids);

static struct serio_driver pm_drv = {
      .driver           = {
            .name = "penmountlpc",
      },
      .description      = DRIVER_DESC,
      .id_table   = pm_serio_ids,
      .interrupt  = pm_interrupt,
      .connect    = pm_connect,
      .disconnect = pm_disconnect,
};

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

static int __init pm_init(void)
{
      return serio_register_driver(&pm_drv);
}

static void __exit pm_exit(void)
{
      serio_unregister_driver(&pm_drv);
}

module_init(pm_init);
module_exit(pm_exit);

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