1fd8f5e192f9d4de9fdb48974e31fc7a6e0f97ab
[releases.git] / touchkit_ps2.c
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 }