/* ---------------------------------------------------------------------------- * 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, bool 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; }