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