touchkit_ps2.c

   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 at:
  25  * http://home.eeti.com.tw/web20/drivers/Software%20Programming%20Guide_v2.0.pdf
  26  */
  27
  28 #include <linux/kernel.h>
  29
  30 #include <linux/input.h>
  31 #include <linux/serio.h>
  32 #include <linux/libps2.h>
  33
  34 #include "psmouse.h"
  35 #include "touchkit_ps2.h"
  36
  37 #define TOUCHKIT_MAX_XC                 0x07ff
  38 #define TOUCHKIT_MAX_YC                 0x07ff
  39
  40 #define TOUCHKIT_CMD                    0x0a
  41 #define TOUCHKIT_CMD_LENGTH             1
  42
  43 #define TOUCHKIT_CMD_ACTIVE             'A'
  44 #define TOUCHKIT_CMD_FIRMWARE_VERSION   'D'
  45 #define TOUCHKIT_CMD_CONTROLLER_TYPE    'E'
  46
  47 #define TOUCHKIT_SEND_PARMS(s, r, c)    ((s) << 12 | (r) << 8 | (c))
  48
  49 #define TOUCHKIT_GET_TOUCHED(packet)    (((packet)[0]) & 0x01)
  50 #define TOUCHKIT_GET_X(packet)          (((packet)[1] << 7) | (packet)[2])
  51 #define TOUCHKIT_GET_Y(packet)          (((packet)[3] << 7) | (packet)[4])
  52
  53 static psmouse_ret_t touchkit_ps2_process_byte(struct psmouse *psmouse)
  54 {
  55         unsigned char *packet = psmouse->packet;
  56         struct input_dev *dev = psmouse->dev;
  57
  58         if (psmouse->pktcnt != 5)
  59                 return PSMOUSE_GOOD_DATA;
  60
  61         input_report_abs(dev, ABS_X, TOUCHKIT_GET_X(packet));
  62         input_report_abs(dev, ABS_Y, TOUCHKIT_GET_Y(packet));
  63         input_report_key(dev, BTN_TOUCH, TOUCHKIT_GET_TOUCHED(packet));
  64         input_sync(dev);
  65
  66         return PSMOUSE_FULL_PACKET;
  67 }
  68
  69 int touchkit_ps2_detect(struct psmouse *psmouse, bool set_properties)
  70 {
  71         struct input_dev *dev = psmouse->dev;
  72         unsigned char param[3];
  73         int command;
  74
  75         param[0] = TOUCHKIT_CMD_LENGTH;
  76         param[1] = TOUCHKIT_CMD_ACTIVE;
  77         command = TOUCHKIT_SEND_PARMS(2, 3, TOUCHKIT_CMD);
  78
  79         if (ps2_command(&psmouse->ps2dev, param, command))
  80                 return -ENODEV;
  81
  82         if (param[0] != TOUCHKIT_CMD || param[1] != 0x01 ||
  83             param[2] != TOUCHKIT_CMD_ACTIVE)
  84                 return -ENODEV;
  85
  86         if (set_properties) {
  87                 dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
  88                 dev->keybit[BIT_WORD(BTN_MOUSE)] = 0;
  89                 dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
  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 }