1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Dynapro serial touchscreen driver
4 *
5 * Copyright (c) 2009 Tias Guns
6 * Based on the inexio driver (c) Vojtech Pavlik and Dan Streetman and
7 * Richard Lemon
8 */
9
10
11/*
12 * 2009/09/19 Tias Guns <tias@ulyssis.org>
13 *   Copied inexio.c and edited for Dynapro protocol (from retired Xorg module)
14 */
15
16#include <linux/errno.h>
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/slab.h>
20#include <linux/input.h>
21#include <linux/serio.h>
22
23#define DRIVER_DESC	"Dynapro serial touchscreen driver"
24
25MODULE_AUTHOR("Tias Guns <tias@ulyssis.org>");
26MODULE_DESCRIPTION(DRIVER_DESC);
27MODULE_LICENSE("GPL");
28
29/*
30 * Definitions & global arrays.
31 */
32
33#define DYNAPRO_FORMAT_TOUCH_BIT 0x40
34#define DYNAPRO_FORMAT_LENGTH 3
35#define DYNAPRO_RESPONSE_BEGIN_BYTE 0x80
36
37#define DYNAPRO_MIN_XC 0
38#define DYNAPRO_MAX_XC 0x3ff
39#define DYNAPRO_MIN_YC 0
40#define DYNAPRO_MAX_YC 0x3ff
41
42#define DYNAPRO_GET_XC(data) (data[1] | ((data[0] & 0x38) << 4))
43#define DYNAPRO_GET_YC(data) (data[2] | ((data[0] & 0x07) << 7))
44#define DYNAPRO_GET_TOUCHED(data) (DYNAPRO_FORMAT_TOUCH_BIT & data[0])
45
46/*
47 * Per-touchscreen data.
48 */
49
50struct dynapro {
51	struct input_dev *dev;
52	struct serio *serio;
53	int idx;
54	unsigned char data[DYNAPRO_FORMAT_LENGTH];
55	char phys[32];
56};
57
58static void dynapro_process_data(struct dynapro *pdynapro)
59{
60	struct input_dev *dev = pdynapro->dev;
61
62	if (DYNAPRO_FORMAT_LENGTH == ++pdynapro->idx) {
63		input_report_abs(dev, ABS_X, DYNAPRO_GET_XC(pdynapro->data));
64		input_report_abs(dev, ABS_Y, DYNAPRO_GET_YC(pdynapro->data));
65		input_report_key(dev, BTN_TOUCH,
66				 DYNAPRO_GET_TOUCHED(pdynapro->data));
67		input_sync(dev);
68
69		pdynapro->idx = 0;
70	}
71}
72
73static irqreturn_t dynapro_interrupt(struct serio *serio,
74		unsigned char data, unsigned int flags)
75{
76	struct dynapro *pdynapro = serio_get_drvdata(serio);
77
78	pdynapro->data[pdynapro->idx] = data;
79
80	if (DYNAPRO_RESPONSE_BEGIN_BYTE & pdynapro->data[0])
81		dynapro_process_data(pdynapro);
82	else
83		dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
84			pdynapro->data[0]);
85
86	return IRQ_HANDLED;
87}
88
89static void dynapro_disconnect(struct serio *serio)
90{
91	struct dynapro *pdynapro = serio_get_drvdata(serio);
92
93	input_get_device(pdynapro->dev);
94	input_unregister_device(pdynapro->dev);
95	serio_close(serio);
96	serio_set_drvdata(serio, NULL);
97	input_put_device(pdynapro->dev);
98	kfree(pdynapro);
99}
100
101/*
102 * dynapro_connect() is the routine that is called when someone adds a
103 * new serio device that supports dynapro protocol and registers it as
104 * an input device. This is usually accomplished using inputattach.
105 */
106
107static int dynapro_connect(struct serio *serio, struct serio_driver *drv)
108{
109	struct dynapro *pdynapro;
110	struct input_dev *input_dev;
111	int err;
112
113	pdynapro = kzalloc(sizeof(struct dynapro), GFP_KERNEL);
114	input_dev = input_allocate_device();
115	if (!pdynapro || !input_dev) {
116		err = -ENOMEM;
117		goto fail1;
118	}
119
120	pdynapro->serio = serio;
121	pdynapro->dev = input_dev;
122	snprintf(pdynapro->phys, sizeof(pdynapro->phys),
123		 "%s/input0", serio->phys);
124
125	input_dev->name = "Dynapro Serial TouchScreen";
126	input_dev->phys = pdynapro->phys;
127	input_dev->id.bustype = BUS_RS232;
128	input_dev->id.vendor = SERIO_DYNAPRO;
129	input_dev->id.product = 0;
130	input_dev->id.version = 0x0001;
131	input_dev->dev.parent = &serio->dev;
132	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
133	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
134	input_set_abs_params(pdynapro->dev, ABS_X,
135			     DYNAPRO_MIN_XC, DYNAPRO_MAX_XC, 0, 0);
136	input_set_abs_params(pdynapro->dev, ABS_Y,
137			     DYNAPRO_MIN_YC, DYNAPRO_MAX_YC, 0, 0);
138
139	serio_set_drvdata(serio, pdynapro);
140
141	err = serio_open(serio, drv);
142	if (err)
143		goto fail2;
144
145	err = input_register_device(pdynapro->dev);
146	if (err)
147		goto fail3;
148
149	return 0;
150
151 fail3:	serio_close(serio);
152 fail2:	serio_set_drvdata(serio, NULL);
153 fail1:	input_free_device(input_dev);
154	kfree(pdynapro);
155	return err;
156}
157
158/*
159 * The serio driver structure.
160 */
161
162static const struct serio_device_id dynapro_serio_ids[] = {
163	{
164		.type	= SERIO_RS232,
165		.proto	= SERIO_DYNAPRO,
166		.id	= SERIO_ANY,
167		.extra	= SERIO_ANY,
168	},
169	{ 0 }
170};
171
172MODULE_DEVICE_TABLE(serio, dynapro_serio_ids);
173
174static struct serio_driver dynapro_drv = {
175	.driver		= {
176		.name	= "dynapro",
177	},
178	.description	= DRIVER_DESC,
179	.id_table	= dynapro_serio_ids,
180	.interrupt	= dynapro_interrupt,
181	.connect	= dynapro_connect,
182	.disconnect	= dynapro_disconnect,
183};
184
185module_serio_driver(dynapro_drv);
186