drivers/input/mouse/touchkit_ps2.c

   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 }