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
25 MODULE_AUTHOR("Tias Guns <tias@ulyssis.org>");
26 MODULE_DESCRIPTION(DRIVER_DESC);
27 MODULE_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
50 struct 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
dynapro_process_data(struct dynapro * pdynapro)58 static 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
dynapro_interrupt(struct serio * serio,unsigned char data,unsigned int flags)73 static 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
dynapro_disconnect(struct serio * serio)89 static 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
dynapro_connect(struct serio * serio,struct serio_driver * drv)107 static 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(*pdynapro), 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
162 static 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
172 MODULE_DEVICE_TABLE(serio, dynapro_serio_ids);
173
174 static 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
185 module_serio_driver(dynapro_drv);
186