LXR linux/drivers/input/mouse/touchkit

   1/* ----------------------------------------------------------------------------
   2 * touchkit_ps2.c  --  Driver for eGalax TouchKit PS/2 Touchscreens
   3 *
   4 * Copyright (C) 2005 by Stefan Lucke
   5 * Copyright (C) 2004 by Daniel Ritz
   6 * Copyright (C) by Todd E. Johnson (mtouchusb.c)
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License as
  10 * published by the Free Software Foundation; either version 2 of the
  11 * License, or (at your option) any later version.
  12 *
  13 * This program is distributed in the hope that it will be useful, but
  14 * WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 * General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program; if not, write to the Free Software
  20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 *
  22 * Based upon touchkitusb.c
  23 *
  24 * Vendor documentation is available in support section of:
  25 * http://www.egalax.com.tw/
  26 */
  27
  28#include <linux/kernel.h>
  29#include <linux/slab.h>
  30
  31#include <linux/input.h>
  32#include <linux/serio.h>
  33#include <linux/libps2.h>
  34
  35#include "psmouse.h"
  36#include "touchkit_ps2.h"
  37
  38#define TOUCHKIT_MAX_XC                 0x07ff
  39#define TOUCHKIT_MAX_YC                 0x07ff
  40
  41#define TOUCHKIT_CMD                    0x0a
  42#define TOUCHKIT_CMD_LENGTH             1
  43
  44#define TOUCHKIT_CMD_ACTIVE             'A'
  45#define TOUCHKIT_CMD_FIRMWARE_VERSION   'D'
  46#define TOUCHKIT_CMD_CONTROLLER_TYPE    'E'
  47
  48#define TOUCHKIT_SEND_PARMS(s, r, c)    ((s) << 12 | (r) << 8 | (c))
  49
  50#define TOUCHKIT_GET_TOUCHED(packet)    (((packet)[0]) & 0x01)
  51#define TOUCHKIT_GET_X(packet)          (((packet)[1] << 7) | (packet)[2])
  52#define TOUCHKIT_GET_Y(packet)          (((packet)[3] << 7) | (packet)[4])
  53
  54static psmouse_ret_t touchkit_ps2_process_byte(struct psmouse *psmouse)
  55{
  56        unsigned char *packet = psmouse->packet;
  57        struct input_dev *dev = psmouse->dev;
  58
  59        if (psmouse->pktcnt != 5)
  60                return PSMOUSE_GOOD_DATA;
  61
  62        input_report_abs(dev, ABS_X, TOUCHKIT_GET_X(packet));
  63        input_report_abs(dev, ABS_Y, TOUCHKIT_GET_Y(packet));
  64        input_report_key(dev, BTN_TOUCH, TOUCHKIT_GET_TOUCHED(packet));
  65        input_sync(dev);
  66
  67        return PSMOUSE_FULL_PACKET;
  68}
  69
  70int touchkit_ps2_detect(struct psmouse *psmouse, bool set_properties)
  71{
  72        struct input_dev *dev = psmouse->dev;
  73        unsigned char param[3];
  74        int command;
  75
  76        param[0] = TOUCHKIT_CMD_LENGTH;
  77        param[1] = TOUCHKIT_CMD_ACTIVE;
  78        command = TOUCHKIT_SEND_PARMS(2, 3, TOUCHKIT_CMD);
  79
  80        if (ps2_command(&psmouse->ps2dev, param, command))
  81                return -ENODEV;
  82
  83        if (param[0] != TOUCHKIT_CMD || param[1] != 0x01 ||
  84            param[2] != TOUCHKIT_CMD_ACTIVE)
  85                return -ENODEV;
  86
  87        if (set_properties) {
  88                dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
  89                __set_bit(BTN_TOUCH, dev->keybit);
  90                input_set_abs_params(dev, ABS_X, 0, TOUCHKIT_MAX_XC, 0, 0);
  91                input_set_abs_params(dev, ABS_Y, 0, TOUCHKIT_MAX_YC, 0, 0);
  92
  93                psmouse->vendor = "eGalax";
  94                psmouse->name = "Touchscreen";
  95                psmouse->protocol_handler = touchkit_ps2_process_byte;
  96                psmouse->pktsize = 5;
  97        }
  98
  99        return 0;
 100}
 101