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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * iNexio serial touchscreen driver
4 *
5 * Copyright (c) 2008 Richard Lemon
6 * Based on the mtouch driver (c) Vojtech Pavlik and Dan Streetman
7 */
8
9
10/*
11 * 2008/06/19 Richard Lemon <[email protected]>
12 * Copied mtouch.c and edited for iNexio protocol
13 */
14
15#include <linux/errno.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/slab.h>
19#include <linux/input.h>
20#include <linux/serio.h>
21
22#define DRIVER_DESC "iNexio serial touchscreen driver"
23
24MODULE_AUTHOR("Richard Lemon <[email protected]>");
25MODULE_DESCRIPTION(DRIVER_DESC);
26MODULE_LICENSE("GPL");
27
28/*
29 * Definitions & global arrays.
30 */
31
32#define INEXIO_FORMAT_TOUCH_BIT 0x01
33#define INEXIO_FORMAT_LENGTH 5
34#define INEXIO_RESPONSE_BEGIN_BYTE 0x80
35
36/* todo: check specs for max length of all responses */
37#define INEXIO_MAX_LENGTH 16
38
39#define INEXIO_MIN_XC 0
40#define INEXIO_MAX_XC 0x3fff
41#define INEXIO_MIN_YC 0
42#define INEXIO_MAX_YC 0x3fff
43
44#define INEXIO_GET_XC(data) (((data[1])<<7) | data[2])
45#define INEXIO_GET_YC(data) (((data[3])<<7) | data[4])
46#define INEXIO_GET_TOUCHED(data) (INEXIO_FORMAT_TOUCH_BIT & data[0])
47
48/*
49 * Per-touchscreen data.
50 */
51
52struct inexio {
53 struct input_dev *dev;
54 struct serio *serio;
55 int idx;
56 unsigned char data[INEXIO_MAX_LENGTH];
57 char phys[32];
58};
59
60static void inexio_process_data(struct inexio *pinexio)
61{
62 struct input_dev *dev = pinexio->dev;
63
64 if (INEXIO_FORMAT_LENGTH == ++pinexio->idx) {
65 input_report_abs(dev, ABS_X, INEXIO_GET_XC(pinexio->data));
66 input_report_abs(dev, ABS_Y, INEXIO_GET_YC(pinexio->data));
67 input_report_key(dev, BTN_TOUCH, INEXIO_GET_TOUCHED(pinexio->data));
68 input_sync(dev);
69
70 pinexio->idx = 0;
71 }
72}
73
74static irqreturn_t inexio_interrupt(struct serio *serio,
75 unsigned char data, unsigned int flags)
76{
77 struct inexio *pinexio = serio_get_drvdata(serio);
78
79 pinexio->data[pinexio->idx] = data;
80
81 if (INEXIO_RESPONSE_BEGIN_BYTE&pinexio->data[0])
82 inexio_process_data(pinexio);
83 else
84 dev_dbg(&serio->dev,
85 "unknown/unsynchronized data from device, byte %x\n",
86 pinexio->data[0]);
87
88 return IRQ_HANDLED;
89}
90
91/*
92 * inexio_disconnect() is the opposite of inexio_connect()
93 */
94
95static void inexio_disconnect(struct serio *serio)
96{
97 struct inexio *pinexio = serio_get_drvdata(serio);
98
99 input_get_device(pinexio->dev);
100 input_unregister_device(pinexio->dev);
101 serio_close(serio);
102 serio_set_drvdata(serio, NULL);
103 input_put_device(pinexio->dev);
104 kfree(pinexio);
105}
106
107/*
108 * inexio_connect() is the routine that is called when someone adds a
109 * new serio device that supports iNexio protocol and registers it as
110 * an input device. This is usually accomplished using inputattach.
111 */
112
113static int inexio_connect(struct serio *serio, struct serio_driver *drv)
114{
115 struct inexio *pinexio;
116 struct input_dev *input_dev;
117 int err;
118
119 pinexio = kzalloc_obj(*pinexio);
120 input_dev = input_allocate_device();
121 if (!pinexio || !input_dev) {
122 err = -ENOMEM;
123 goto fail1;
124 }
125
126 pinexio->serio = serio;
127 pinexio->dev = input_dev;
128 scnprintf(pinexio->phys, sizeof(pinexio->phys), "%s/input0", serio->phys);
129
130 input_dev->name = "iNexio Serial TouchScreen";
131 input_dev->phys = pinexio->phys;
132 input_dev->id.bustype = BUS_RS232;
133 input_dev->id.vendor = SERIO_INEXIO;
134 input_dev->id.product = 0;
135 input_dev->id.version = 0x0001;
136 input_dev->dev.parent = &serio->dev;
137 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
138 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
139 input_set_abs_params(pinexio->dev, ABS_X, INEXIO_MIN_XC, INEXIO_MAX_XC, 0, 0);
140 input_set_abs_params(pinexio->dev, ABS_Y, INEXIO_MIN_YC, INEXIO_MAX_YC, 0, 0);
141
142 serio_set_drvdata(serio, pinexio);
143
144 err = serio_open(serio, drv);
145 if (err)
146 goto fail2;
147
148 err = input_register_device(pinexio->dev);
149 if (err)
150 goto fail3;
151
152 return 0;
153
154 fail3: serio_close(serio);
155 fail2: serio_set_drvdata(serio, NULL);
156 fail1: input_free_device(input_dev);
157 kfree(pinexio);
158 return err;
159}
160
161/*
162 * The serio driver structure.
163 */
164
165static const struct serio_device_id inexio_serio_ids[] = {
166 {
167 .type = SERIO_RS232,
168 .proto = SERIO_INEXIO,
169 .id = SERIO_ANY,
170 .extra = SERIO_ANY,
171 },
172 { 0 }
173};
174
175MODULE_DEVICE_TABLE(serio, inexio_serio_ids);
176
177static struct serio_driver inexio_drv = {
178 .driver = {
179 .name = "inexio",
180 },
181 .description = DRIVER_DESC,
182 .id_table = inexio_serio_ids,
183 .interrupt = inexio_interrupt,
184 .connect = inexio_connect,
185 .disconnect = inexio_disconnect,
186};
187
188module_serio_driver(inexio_drv);