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 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 53static 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 69int 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} 101