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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 | ||
54 | static 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 | ||
70 | int 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 | } |