LXR linux/drivers/input/mouse/touchkit

   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
  40static 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
  56int 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