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 at:
25  * http://home.eeti.com.tw/web20/drivers/Software%20Programming%20Guide_v2.0.pdf
26  */
27 
28 #include <linux/kernel.h>
29 
30 #include <linux/input.h>
31 #include <linux/serio.h>
32 #include <linux/libps2.h>
33 
34 #include "psmouse.h"
35 #include "touchkit_ps2.h"
36 
37 #define TOUCHKIT_MAX_XC			0x07ff
38 #define TOUCHKIT_MAX_YC			0x07ff
39 
40 #define TOUCHKIT_CMD			0x0a
41 #define TOUCHKIT_CMD_LENGTH		1
42 
43 #define TOUCHKIT_CMD_ACTIVE		'A'
44 #define TOUCHKIT_CMD_FIRMWARE_VERSION	'D'
45 #define TOUCHKIT_CMD_CONTROLLER_TYPE	'E'
46 
47 #define TOUCHKIT_SEND_PARMS(s, r, c)	((s) << 12 | (r) << 8 | (c))
48 
49 #define TOUCHKIT_GET_TOUCHED(packet)	(((packet)[0]) & 0x01)
50 #define TOUCHKIT_GET_X(packet)		(((packet)[1] << 7) | (packet)[2])
51 #define TOUCHKIT_GET_Y(packet)		(((packet)[3] << 7) | (packet)[4])
52 
53 static psmouse_ret_t touchkit_ps2_process_byte(struct psmouse *psmouse)
54 {
55 	unsigned char *packet = psmouse->packet;
56 	struct input_dev *dev = psmouse->dev;
57 
58 	if (psmouse->pktcnt != 5)
59 		return PSMOUSE_GOOD_DATA;
60 
61 	input_report_abs(dev, ABS_X, TOUCHKIT_GET_X(packet));
62 	input_report_abs(dev, ABS_Y, TOUCHKIT_GET_Y(packet));
63 	input_report_key(dev, BTN_TOUCH, TOUCHKIT_GET_TOUCHED(packet));
64 	input_sync(dev);
65 
66 	return PSMOUSE_FULL_PACKET;
67 }
68 
69 int touchkit_ps2_detect(struct psmouse *psmouse, bool set_properties)
70 {
71 	struct input_dev *dev = psmouse->dev;
72 	unsigned char param[3];
73 	int command;
74 
75 	param[0] = TOUCHKIT_CMD_LENGTH;
76 	param[1] = TOUCHKIT_CMD_ACTIVE;
77 	command = TOUCHKIT_SEND_PARMS(2, 3, TOUCHKIT_CMD);
78 
79 	if (ps2_command(&psmouse->ps2dev, param, command))
80 		return -ENODEV;
81 
82 	if (param[0] != TOUCHKIT_CMD || param[1] != 0x01 ||
83 	    param[2] != TOUCHKIT_CMD_ACTIVE)
84 		return -ENODEV;
85 
86 	if (set_properties) {
87 		dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
88 		dev->keybit[BIT_WORD(BTN_MOUSE)] = 0;
89 		dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
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