/* ----------------------------------------------------------------------------
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* touchkit_ps2.c -- Driver for eGalax TouchKit PS/2 Touchscreens
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*
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* Copyright (C) 2005 by Stefan Lucke
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* Copyright (C) 2004 by Daniel Ritz
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* Copyright (C) by Todd E. Johnson (mtouchusb.c)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Based upon touchkitusb.c
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*
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* Vendor documentation is available at:
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* http://home.eeti.com.tw/web20/drivers/Software%20Programming%20Guide_v2.0.pdf
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*/
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#include <linux/kernel.h>
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#include <linux/input.h>
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#include <linux/serio.h>
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#include <linux/libps2.h>
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#include "psmouse.h"
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#include "touchkit_ps2.h"
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#define TOUCHKIT_MAX_XC 0x07ff
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#define TOUCHKIT_MAX_YC 0x07ff
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#define TOUCHKIT_CMD 0x0a
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#define TOUCHKIT_CMD_LENGTH 1
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#define TOUCHKIT_CMD_ACTIVE 'A'
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#define TOUCHKIT_CMD_FIRMWARE_VERSION 'D'
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#define TOUCHKIT_CMD_CONTROLLER_TYPE 'E'
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#define TOUCHKIT_SEND_PARMS(s, r, c) ((s) << 12 | (r) << 8 | (c))
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#define TOUCHKIT_GET_TOUCHED(packet) (((packet)[0]) & 0x01)
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#define TOUCHKIT_GET_X(packet) (((packet)[1] << 7) | (packet)[2])
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#define TOUCHKIT_GET_Y(packet) (((packet)[3] << 7) | (packet)[4])
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static psmouse_ret_t touchkit_ps2_process_byte(struct psmouse *psmouse)
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{
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unsigned char *packet = psmouse->packet;
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struct input_dev *dev = psmouse->dev;
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if (psmouse->pktcnt != 5)
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return PSMOUSE_GOOD_DATA;
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input_report_abs(dev, ABS_X, TOUCHKIT_GET_X(packet));
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input_report_abs(dev, ABS_Y, TOUCHKIT_GET_Y(packet));
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input_report_key(dev, BTN_TOUCH, TOUCHKIT_GET_TOUCHED(packet));
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input_sync(dev);
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return PSMOUSE_FULL_PACKET;
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}
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int touchkit_ps2_detect(struct psmouse *psmouse, bool set_properties)
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{
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struct input_dev *dev = psmouse->dev;
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unsigned char param[3];
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int command;
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param[0] = TOUCHKIT_CMD_LENGTH;
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param[1] = TOUCHKIT_CMD_ACTIVE;
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command = TOUCHKIT_SEND_PARMS(2, 3, TOUCHKIT_CMD);
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if (ps2_command(&psmouse->ps2dev, param, command))
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return -ENODEV;
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if (param[0] != TOUCHKIT_CMD || param[1] != 0x01 ||
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param[2] != TOUCHKIT_CMD_ACTIVE)
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return -ENODEV;
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if (set_properties) {
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dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
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dev->keybit[BIT_WORD(BTN_MOUSE)] = 0;
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dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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input_set_abs_params(dev, ABS_X, 0, TOUCHKIT_MAX_XC, 0, 0);
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input_set_abs_params(dev, ABS_Y, 0, TOUCHKIT_MAX_YC, 0, 0);
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psmouse->vendor = "eGalax";
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psmouse->name = "Touchscreen";
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psmouse->protocol_handler = touchkit_ps2_process_byte;
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psmouse->pktsize = 5;
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}
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return 0;
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}
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