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jornada720_ts.c

/*
 * drivers/input/touchscreen/jornada720_ts.c
 *
 * Copyright (C) 2007 Kristoffer Ericson <Kristoffer.Ericson@gmail.com>
 *
 *  Copyright (C) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl>
 *  based on HP Jornada 56x touchscreen driver by Alex Lange <chicken@handhelds.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.
 *
 * HP Jornada 710/720/729 Touchscreen Driver
 */

#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/module.h>

#include <asm/hardware.h>
#include <asm/arch/jornada720.h>

MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
MODULE_DESCRIPTION("HP Jornada 710/720/728 touchscreen driver");
MODULE_LICENSE("GPLv2");

struct jornada_ts {
      struct input_dev *dev;
      int x_data[4];          /* X sample values */
      int y_data[4];          /* Y sample values */
};

static void jornada720_ts_collect_data(struct jornada_ts *jornada_ts)
{

    /* 3 low word X samples */
    jornada_ts->x_data[0] = jornada_ssp_byte(TXDUMMY);
    jornada_ts->x_data[1] = jornada_ssp_byte(TXDUMMY);
    jornada_ts->x_data[2] = jornada_ssp_byte(TXDUMMY);

    /* 3 low word Y samples */
    jornada_ts->y_data[0] = jornada_ssp_byte(TXDUMMY);
    jornada_ts->y_data[1] = jornada_ssp_byte(TXDUMMY);
    jornada_ts->y_data[2] = jornada_ssp_byte(TXDUMMY);

    /* combined x samples bits */
    jornada_ts->x_data[3] = jornada_ssp_byte(TXDUMMY);

    /* combined y samples bits */
    jornada_ts->y_data[3] = jornada_ssp_byte(TXDUMMY);
}

static int jornada720_ts_average(int coords[4])
{
      int coord, high_bits = coords[3];

      coord  = coords[0] | ((high_bits & 0x03) << 8);
      coord += coords[1] | ((high_bits & 0x0c) << 6);
      coord += coords[2] | ((high_bits & 0x30) << 4);

      return coord / 3;
}

static irqreturn_t jornada720_ts_interrupt(int irq, void *dev_id)
{
      struct platform_device *pdev = dev_id;
      struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);
      struct input_dev *input = jornada_ts->dev;
      int x, y;

      /* If GPIO_GPIO9 is set to high then report pen up */
      if (GPLR & GPIO_GPIO(9)) {
            input_report_key(input, BTN_TOUCH, 0);
            input_sync(input);
      } else {
            jornada_ssp_start();

            /* proper reply to request is always TXDUMMY */
            if (jornada_ssp_inout(GETTOUCHSAMPLES) == TXDUMMY) {
                  jornada720_ts_collect_data(jornada_ts);

                  x = jornada720_ts_average(jornada_ts->x_data);
                  y = jornada720_ts_average(jornada_ts->y_data);

                  input_report_key(input, BTN_TOUCH, 1);
                  input_report_abs(input, ABS_X, x);
                  input_report_abs(input, ABS_Y, y);
                  input_sync(input);
            }

            jornada_ssp_end();
      }

      return IRQ_HANDLED;
}

static int __devinit jornada720_ts_probe(struct platform_device *pdev)
{
      struct jornada_ts *jornada_ts;
      struct input_dev *input_dev;
      int error;

      jornada_ts = kzalloc(sizeof(struct jornada_ts), GFP_KERNEL);
      input_dev = input_allocate_device();

      if (!jornada_ts || !input_dev) {
            error = -ENOMEM;
            goto fail1;
      }

      platform_set_drvdata(pdev, jornada_ts);

      jornada_ts->dev = input_dev;

      input_dev->name = "HP Jornada 7xx Touchscreen";
      input_dev->phys = "jornadats/input0";
      input_dev->id.bustype = BUS_HOST;
      input_dev->dev.parent = &pdev->dev;

      input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
      input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
      input_set_abs_params(input_dev, ABS_X, 270, 3900, 0, 0);
      input_set_abs_params(input_dev, ABS_Y, 180, 3700, 0, 0);

      error = request_irq(IRQ_GPIO9,
                  jornada720_ts_interrupt,
                  IRQF_DISABLED | IRQF_TRIGGER_RISING,
                  "HP7XX Touchscreen driver", pdev);
      if (error) {
            printk(KERN_INFO "HP7XX TS : Unable to acquire irq!\n");
            goto fail1;
      }

      error = input_register_device(jornada_ts->dev);
      if (error)
            goto fail2;

      return 0;

 fail2:
      free_irq(IRQ_GPIO9, pdev);
 fail1:
      platform_set_drvdata(pdev, NULL);
      input_free_device(input_dev);
      kfree(jornada_ts);
      return error;
}

static int __devexit jornada720_ts_remove(struct platform_device *pdev)
{
      struct jornada_ts *jornada_ts = platform_get_drvdata(pdev);

      free_irq(IRQ_GPIO9, pdev);
      platform_set_drvdata(pdev, NULL);
      input_unregister_device(jornada_ts->dev);
      kfree(jornada_ts);

      return 0;
}

static struct platform_driver jornada720_ts_driver = {
      .probe            = jornada720_ts_probe,
      .remove           = __devexit_p(jornada720_ts_remove),
      .driver           = {
            .name = "jornada_ts",
      },
};

static int __init jornada720_ts_init(void)
{
      return platform_driver_register(&jornada720_ts_driver);
}

static void __exit jornada720_ts_exit(void)
{
      platform_driver_unregister(&jornada720_ts_driver);
}

module_init(jornada720_ts_init);
module_exit(jornada720_ts_exit);

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