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touchkit_ps2.c

/* ----------------------------------------------------------------------------
 * touchkit_ps2.c  --  Driver for eGalax TouchKit PS/2 Touchscreens
 *
 * Copyright (C) 2005 by Stefan Lucke
 * Copyright (C) 2004 by Daniel Ritz
 * Copyright (C) by Todd E. Johnson (mtouchusb.c)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Based upon touchkitusb.c
 *
 * Vendor documentation is available in support section of:
 * http://www.egalax.com.tw/
 */

#include <linux/kernel.h>
#include <linux/slab.h>

#include <linux/input.h>
#include <linux/serio.h>
#include <linux/libps2.h>

#include "psmouse.h"
#include "touchkit_ps2.h"

#define TOUCHKIT_MAX_XC             0x07ff
#define TOUCHKIT_MAX_YC             0x07ff

#define TOUCHKIT_CMD                0x0a
#define TOUCHKIT_CMD_LENGTH         1

#define TOUCHKIT_CMD_ACTIVE         'A'
#define TOUCHKIT_CMD_FIRMWARE_VERSION     'D'
#define TOUCHKIT_CMD_CONTROLLER_TYPE      'E'

#define TOUCHKIT_SEND_PARMS(s, r, c)      ((s) << 12 | (r) << 8 | (c))

#define TOUCHKIT_GET_TOUCHED(packet)      (((packet)[0]) & 0x01)
#define TOUCHKIT_GET_X(packet)            (((packet)[1] << 7) | (packet)[2])
#define TOUCHKIT_GET_Y(packet)            (((packet)[3] << 7) | (packet)[4])

static psmouse_ret_t touchkit_ps2_process_byte(struct psmouse *psmouse)
{
      unsigned char *packet = psmouse->packet;
      struct input_dev *dev = psmouse->dev;

      if (psmouse->pktcnt != 5)
            return PSMOUSE_GOOD_DATA;

      input_report_abs(dev, ABS_X, TOUCHKIT_GET_X(packet));
      input_report_abs(dev, ABS_Y, TOUCHKIT_GET_Y(packet));
      input_report_key(dev, BTN_TOUCH, TOUCHKIT_GET_TOUCHED(packet));
      input_sync(dev);

      return PSMOUSE_FULL_PACKET;
}

int touchkit_ps2_detect(struct psmouse *psmouse, int set_properties)
{
      struct input_dev *dev = psmouse->dev;
      unsigned char param[3];
      int command;

      param[0] = TOUCHKIT_CMD_LENGTH;
      param[1] = TOUCHKIT_CMD_ACTIVE;
      command = TOUCHKIT_SEND_PARMS(2, 3, TOUCHKIT_CMD);

      if (ps2_command(&psmouse->ps2dev, param, command))
            return -ENODEV;

      if (param[0] != TOUCHKIT_CMD || param[1] != 0x01 ||
          param[2] != TOUCHKIT_CMD_ACTIVE)
            return -ENODEV;

      if (set_properties) {
            dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
            set_bit(BTN_TOUCH, dev->keybit);
            input_set_abs_params(dev, ABS_X, 0, TOUCHKIT_MAX_XC, 0, 0);
            input_set_abs_params(dev, ABS_Y, 0, TOUCHKIT_MAX_YC, 0, 0);

            psmouse->vendor = "eGalax";
            psmouse->name = "Touchscreen";
            psmouse->protocol_handler = touchkit_ps2_process_byte;
            psmouse->pktsize = 5;
      }

      return 0;
}

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