1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* ---------------------------------------------------------------------------- 3 * touchkit_ps2.c -- Driver for eGalax TouchKit PS/2 Touchscreens 4 * 5 * Copyright (C) 2005 by Stefan Lucke 6 * Copyright (C) 2004 by Daniel Ritz 7 * Copyright (C) by Todd E. Johnson (mtouchusb.c) 8 * 9 * Based upon touchkitusb.c 10 * 11 * Vendor documentation is available at: 12 * http://home.eeti.com.tw/web20/drivers/Software%20Programming%20Guide_v2.0.pdf 13 */ 14 15 #include <linux/kernel.h> 16 17 #include <linux/input.h> 18 #include <linux/serio.h> 19 #include <linux/libps2.h> 20 21 #include "psmouse.h" 22 #include "touchkit_ps2.h" 23 24 #define TOUCHKIT_MAX_XC 0x07ff 25 #define TOUCHKIT_MAX_YC 0x07ff 26 27 #define TOUCHKIT_CMD 0x0a 28 #define TOUCHKIT_CMD_LENGTH 1 29 30 #define TOUCHKIT_CMD_ACTIVE 'A' 31 #define TOUCHKIT_CMD_FIRMWARE_VERSION 'D' 32 #define TOUCHKIT_CMD_CONTROLLER_TYPE 'E' 33 34 #define TOUCHKIT_SEND_PARMS(s, r, c) ((s) << 12 | (r) << 8 | (c)) 35 36 #define TOUCHKIT_GET_TOUCHED(packet) (((packet)[0]) & 0x01) 37 #define TOUCHKIT_GET_X(packet) (((packet)[1] << 7) | (packet)[2]) 38 #define TOUCHKIT_GET_Y(packet) (((packet)[3] << 7) | (packet)[4]) 39 40 static psmouse_ret_t touchkit_ps2_process_byte(struct psmouse *psmouse) 41 { 42 unsigned char *packet = psmouse->packet; 43 struct input_dev *dev = psmouse->dev; 44 45 if (psmouse->pktcnt != 5) 46 return PSMOUSE_GOOD_DATA; 47 48 input_report_abs(dev, ABS_X, TOUCHKIT_GET_X(packet)); 49 input_report_abs(dev, ABS_Y, TOUCHKIT_GET_Y(packet)); 50 input_report_key(dev, BTN_TOUCH, TOUCHKIT_GET_TOUCHED(packet)); 51 input_sync(dev); 52 53 return PSMOUSE_FULL_PACKET; 54 } 55 56 int touchkit_ps2_detect(struct psmouse *psmouse, bool set_properties) 57 { 58 struct input_dev *dev = psmouse->dev; 59 unsigned char param[3]; 60 int command; 61 62 param[0] = TOUCHKIT_CMD_LENGTH; 63 param[1] = TOUCHKIT_CMD_ACTIVE; 64 command = TOUCHKIT_SEND_PARMS(2, 3, TOUCHKIT_CMD); 65 66 if (ps2_command(&psmouse->ps2dev, param, command)) 67 return -ENODEV; 68 69 if (param[0] != TOUCHKIT_CMD || param[1] != 0x01 || 70 param[2] != TOUCHKIT_CMD_ACTIVE) 71 return -ENODEV; 72 73 if (set_properties) { 74 dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 75 dev->keybit[BIT_WORD(BTN_MOUSE)] = 0; 76 dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); 77 input_set_abs_params(dev, ABS_X, 0, TOUCHKIT_MAX_XC, 0, 0); 78 input_set_abs_params(dev, ABS_Y, 0, TOUCHKIT_MAX_YC, 0, 0); 79 80 psmouse->vendor = "eGalax"; 81 psmouse->name = "Touchscreen"; 82 psmouse->protocol_handler = touchkit_ps2_process_byte; 83 psmouse->pktsize = 5; 84 } 85 86 return 0; 87 } 88