input/mouse/touchkit_ps2.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /* ----------------------------------------------------------------------------
0003  * touchkit_ps2.c  --  Driver for eGalax TouchKit PS/2 Touchscreens
0004  *
0005  * Copyright (C) 2005 by Stefan Lucke
0006  * Copyright (C) 2004 by Daniel Ritz
0007  * Copyright (C) by Todd E. Johnson (mtouchusb.c)
0008  *
0009  * Based upon touchkitusb.c
0010  *
0011  * Vendor documentation is available at:
0012  * http://home.eeti.com.tw/web20/drivers/Software%20Programming%20Guide_v2.0.pdf
0013  */
0014
0015 #include <linux/kernel.h>
0016
0017 #include <linux/input.h>
0018 #include <linux/serio.h>
0019 #include <linux/libps2.h>
0020
0021 #include "psmouse.h"
0022 #include "touchkit_ps2.h"
0023
0024 #define TOUCHKIT_MAX_XC         0x07ff
0025 #define TOUCHKIT_MAX_YC         0x07ff
0026
0027 #define TOUCHKIT_CMD            0x0a
0028 #define TOUCHKIT_CMD_LENGTH     1
0029
0030 #define TOUCHKIT_CMD_ACTIVE     'A'
0031 #define TOUCHKIT_CMD_FIRMWARE_VERSION   'D'
0032 #define TOUCHKIT_CMD_CONTROLLER_TYPE    'E'
0033
0034 #define TOUCHKIT_SEND_PARMS(s, r, c)    ((s) << 12 | (r) << 8 | (c))
0035
0036 #define TOUCHKIT_GET_TOUCHED(packet)    (((packet)[0]) & 0x01)
0037 #define TOUCHKIT_GET_X(packet)      (((packet)[1] << 7) | (packet)[2])
0038 #define TOUCHKIT_GET_Y(packet)      (((packet)[3] << 7) | (packet)[4])
0039
0040 static psmouse_ret_t touchkit_ps2_process_byte(struct psmouse *psmouse)
0041 {
0042     unsigned char *packet = psmouse->packet;
0043     struct input_dev *dev = psmouse->dev;
0044
0045     if (psmouse->pktcnt != 5)
0046         return PSMOUSE_GOOD_DATA;
0047
0048     input_report_abs(dev, ABS_X, TOUCHKIT_GET_X(packet));
0049     input_report_abs(dev, ABS_Y, TOUCHKIT_GET_Y(packet));
0050     input_report_key(dev, BTN_TOUCH, TOUCHKIT_GET_TOUCHED(packet));
0051     input_sync(dev);
0052
0053     return PSMOUSE_FULL_PACKET;
0054 }
0055
0056 int touchkit_ps2_detect(struct psmouse *psmouse, bool set_properties)
0057 {
0058     struct input_dev *dev = psmouse->dev;
0059     unsigned char param[3];
0060     int command;
0061
0062     param[0] = TOUCHKIT_CMD_LENGTH;
0063     param[1] = TOUCHKIT_CMD_ACTIVE;
0064     command = TOUCHKIT_SEND_PARMS(2, 3, TOUCHKIT_CMD);
0065
0066     if (ps2_command(&psmouse->ps2dev, param, command))
0067         return -ENODEV;
0068
0069     if (param[0] != TOUCHKIT_CMD || param[1] != 0x01 ||
0070         param[2] != TOUCHKIT_CMD_ACTIVE)
0071         return -ENODEV;
0072
0073     if (set_properties) {
0074         dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
0075         dev->keybit[BIT_WORD(BTN_MOUSE)] = 0;
0076         dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
0077         input_set_abs_params(dev, ABS_X, 0, TOUCHKIT_MAX_XC, 0, 0);
0078         input_set_abs_params(dev, ABS_Y, 0, TOUCHKIT_MAX_YC, 0, 0);
0079
0080         psmouse->vendor = "eGalax";
0081         psmouse->name = "Touchscreen";
0082         psmouse->protocol_handler = touchkit_ps2_process_byte;
0083         psmouse->pktsize = 5;
0084     }
0085
0086     return 0;
0087 }