1/* ----------------------------------------------------------------------------
2 * touchkit_ps2.c  --  Driver for eGalax TouchKit PS/2 Touchscreens
3 *
4 * Copyright (C) 2005 by Stefan Lucke
5 * Copyright (C) 2004 by Daniel Ritz
6 * Copyright (C) by Todd E. Johnson (mtouchusb.c)
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * Based upon touchkitusb.c
23 *
24 * Vendor documentation is available in support section of:
25 * http://www.egalax.com.tw/
26 */
27
28#include <linux/kernel.h>
29#include <linux/slab.h>
30
31#include <linux/input.h>
32#include <linux/serio.h>
33#include <linux/libps2.h>
34
35#include "psmouse.h"
36#include "touchkit_ps2.h"
37
38#define TOUCHKIT_MAX_XC			0x07ff
39#define TOUCHKIT_MAX_YC			0x07ff
40
41#define TOUCHKIT_CMD			0x0a
42#define TOUCHKIT_CMD_LENGTH		1
43
44#define TOUCHKIT_CMD_ACTIVE		'A'
45#define TOUCHKIT_CMD_FIRMWARE_VERSION	'D'
46#define TOUCHKIT_CMD_CONTROLLER_TYPE	'E'
47
48#define TOUCHKIT_SEND_PARMS(s, r, c)	((s) << 12 | (r) << 8 | (c))
49
50#define TOUCHKIT_GET_TOUCHED(packet)	(((packet)[0]) & 0x01)
51#define TOUCHKIT_GET_X(packet)		(((packet)[1] << 7) | (packet)[2])
52#define TOUCHKIT_GET_Y(packet)		(((packet)[3] << 7) | (packet)[4])
53
54static psmouse_ret_t touchkit_ps2_process_byte(struct psmouse *psmouse)
55{
56	unsigned char *packet = psmouse->packet;
57	struct input_dev *dev = psmouse->dev;
58
59	if (psmouse->pktcnt != 5)
60		return PSMOUSE_GOOD_DATA;
61
62	input_report_abs(dev, ABS_X, TOUCHKIT_GET_X(packet));
63	input_report_abs(dev, ABS_Y, TOUCHKIT_GET_Y(packet));
64	input_report_key(dev, BTN_TOUCH, TOUCHKIT_GET_TOUCHED(packet));
65	input_sync(dev);
66
67	return PSMOUSE_FULL_PACKET;
68}
69
70int touchkit_ps2_detect(struct psmouse *psmouse, int set_properties)
71{
72	struct input_dev *dev = psmouse->dev;
73	unsigned char param[3];
74	int command;
75
76	param[0] = TOUCHKIT_CMD_LENGTH;
77	param[1] = TOUCHKIT_CMD_ACTIVE;
78	command = TOUCHKIT_SEND_PARMS(2, 3, TOUCHKIT_CMD);
79
80	if (ps2_command(&psmouse->ps2dev, param, command))
81		return -ENODEV;
82
83	if (param[0] != TOUCHKIT_CMD || param[1] != 0x01 ||
84	    param[2] != TOUCHKIT_CMD_ACTIVE)
85		return -ENODEV;
86
87	if (set_properties) {
88		dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
89		set_bit(BTN_TOUCH, dev->keybit);
90		input_set_abs_params(dev, ABS_X, 0, TOUCHKIT_MAX_XC, 0, 0);
91		input_set_abs_params(dev, ABS_Y, 0, TOUCHKIT_MAX_YC, 0, 0);
92
93		psmouse->vendor = "eGalax";
94		psmouse->name = "Touchscreen";
95		psmouse->protocol_handler = touchkit_ps2_process_byte;
96		psmouse->pktsize = 5;
97	}
98
99	return 0;
100}
101