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 | |
40 | static 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 | |
56 | int 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(ps2dev: &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, min: 0, TOUCHKIT_MAX_XC, fuzz: 0, flat: 0); |
78 | input_set_abs_params(dev, ABS_Y, min: 0, TOUCHKIT_MAX_YC, fuzz: 0, flat: 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 | |