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1/*
2 * Fujitsu serial touchscreen driver
3 *
4 * Copyright (c) Dmitry Torokhov <dtor@mail.ru>
5 */
6
7/*
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 as published
10 * by the Free Software Foundation.
11 */
12
13#include <linux/errno.h>
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/input.h>
18#include <linux/serio.h>
19#include <linux/init.h>
20
21#define DRIVER_DESC "Fujitsu serial touchscreen driver"
22
23MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
24MODULE_DESCRIPTION(DRIVER_DESC);
25MODULE_LICENSE("GPL");
26
27#define FUJITSU_LENGTH 5
28
29/*
30 * Per-touchscreen data.
31 */
32struct fujitsu {
33 struct input_dev *dev;
34 struct serio *serio;
35 int idx;
36 unsigned char data[FUJITSU_LENGTH];
37 char phys[32];
38};
39
40/*
41 * Decode serial data (5 bytes per packet)
42 * First byte
43 * 1 C 0 0 R S S S
44 * Where C is 1 while in calibration mode (which we don't use)
45 * R is 1 when no coordinate corection was done.
46 * S are button state
47 */
48static irqreturn_t fujitsu_interrupt(struct serio *serio,
49 unsigned char data, unsigned int flags)
50{
51 struct fujitsu *fujitsu = serio_get_drvdata(serio);
52 struct input_dev *dev = fujitsu->dev;
53
54 if (fujitsu->idx == 0) {
55 /* resync skip until start of frame */
56 if ((data & 0xf0) != 0x80)
57 return IRQ_HANDLED;
58 } else {
59 /* resync skip garbage */
60 if (data & 0x80) {
61 fujitsu->idx = 0;
62 return IRQ_HANDLED;
63 }
64 }
65
66 fujitsu->data[fujitsu->idx++] = data;
67 if (fujitsu->idx == FUJITSU_LENGTH) {
68 input_report_abs(dev, ABS_X,
69 (fujitsu->data[2] << 7) | fujitsu->data[1]);
70 input_report_abs(dev, ABS_Y,
71 (fujitsu->data[4] << 7) | fujitsu->data[3]);
72 input_report_key(dev, BTN_TOUCH,
73 (fujitsu->data[0] & 0x03) != 2);
74 input_sync(dev);
75 fujitsu->idx = 0;
76 }
77
78 return IRQ_HANDLED;
79}
80
81/*
82 * fujitsu_disconnect() is the opposite of fujitsu_connect()
83 */
84static void fujitsu_disconnect(struct serio *serio)
85{
86 struct fujitsu *fujitsu = serio_get_drvdata(serio);
87
88 input_get_device(fujitsu->dev);
89 input_unregister_device(fujitsu->dev);
90 serio_close(serio);
91 serio_set_drvdata(serio, NULL);
92 input_put_device(fujitsu->dev);
93 kfree(fujitsu);
94}
95
96/*
97 * fujitsu_connect() is the routine that is called when someone adds a
98 * new serio device that supports the Fujitsu protocol and registers it
99 * as input device.
100 */
101static int fujitsu_connect(struct serio *serio, struct serio_driver *drv)
102{
103 struct fujitsu *fujitsu;
104 struct input_dev *input_dev;
105 int err;
106
107 fujitsu = kzalloc(sizeof(struct fujitsu), GFP_KERNEL);
108 input_dev = input_allocate_device();
109 if (!fujitsu || !input_dev) {
110 err = -ENOMEM;
111 goto fail1;
112 }
113
114 fujitsu->serio = serio;
115 fujitsu->dev = input_dev;
116 snprintf(fujitsu->phys, sizeof(fujitsu->phys),
117 "%s/input0", serio->phys);
118
119 input_dev->name = "Fujitsu Serial Touchscreen";
120 input_dev->phys = fujitsu->phys;
121 input_dev->id.bustype = BUS_RS232;
122 input_dev->id.vendor = SERIO_FUJITSU;
123 input_dev->id.product = 0;
124 input_dev->id.version = 0x0100;
125 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
126 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
127
128 input_set_abs_params(input_dev, ABS_X, 0, 4096, 0, 0);
129 input_set_abs_params(input_dev, ABS_Y, 0, 4096, 0, 0);
130 serio_set_drvdata(serio, fujitsu);
131
132 err = serio_open(serio, drv);
133 if (err)
134 goto fail2;
135
136 err = input_register_device(fujitsu->dev);
137 if (err)
138 goto fail3;
139
140 return 0;
141
142 fail3:
143 serio_close(serio);
144 fail2:
145 serio_set_drvdata(serio, NULL);
146 fail1:
147 input_free_device(input_dev);
148 kfree(fujitsu);
149 return err;
150}
151
152/*
153 * The serio driver structure.
154 */
155static struct serio_device_id fujitsu_serio_ids[] = {
156 {
157 .type = SERIO_RS232,
158 .proto = SERIO_FUJITSU,
159 .id = SERIO_ANY,
160 .extra = SERIO_ANY,
161 },
162 { 0 }
163};
164
165MODULE_DEVICE_TABLE(serio, fujitsu_serio_ids);
166
167static struct serio_driver fujitsu_drv = {
168 .driver = {
169 .name = "fujitsu_ts",
170 },
171 .description = DRIVER_DESC,
172 .id_table = fujitsu_serio_ids,
173 .interrupt = fujitsu_interrupt,
174 .connect = fujitsu_connect,
175 .disconnect = fujitsu_disconnect,
176};
177
178static int __init fujitsu_init(void)
179{
180 return serio_register_driver(&fujitsu_drv);
181}
182
183static void __exit fujitsu_exit(void)
184{
185 serio_unregister_driver(&fujitsu_drv);
186}
187
188module_init(fujitsu_init);
189module_exit(fujitsu_exit);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Fujitsu serial touchscreen driver
4 *
5 * Copyright (c) Dmitry Torokhov <dtor@mail.ru>
6 */
7
8
9#include <linux/errno.h>
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/slab.h>
13#include <linux/input.h>
14#include <linux/serio.h>
15
16#define DRIVER_DESC "Fujitsu serial touchscreen driver"
17
18MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
19MODULE_DESCRIPTION(DRIVER_DESC);
20MODULE_LICENSE("GPL");
21
22#define FUJITSU_LENGTH 5
23
24/*
25 * Per-touchscreen data.
26 */
27struct fujitsu {
28 struct input_dev *dev;
29 struct serio *serio;
30 int idx;
31 unsigned char data[FUJITSU_LENGTH];
32 char phys[32];
33};
34
35/*
36 * Decode serial data (5 bytes per packet)
37 * First byte
38 * 1 C 0 0 R S S S
39 * Where C is 1 while in calibration mode (which we don't use)
40 * R is 1 when no coordinate corection was done.
41 * S are button state
42 */
43static irqreturn_t fujitsu_interrupt(struct serio *serio,
44 unsigned char data, unsigned int flags)
45{
46 struct fujitsu *fujitsu = serio_get_drvdata(serio);
47 struct input_dev *dev = fujitsu->dev;
48
49 if (fujitsu->idx == 0) {
50 /* resync skip until start of frame */
51 if ((data & 0xf0) != 0x80)
52 return IRQ_HANDLED;
53 } else {
54 /* resync skip garbage */
55 if (data & 0x80) {
56 fujitsu->idx = 0;
57 return IRQ_HANDLED;
58 }
59 }
60
61 fujitsu->data[fujitsu->idx++] = data;
62 if (fujitsu->idx == FUJITSU_LENGTH) {
63 input_report_abs(dev, ABS_X,
64 (fujitsu->data[2] << 7) | fujitsu->data[1]);
65 input_report_abs(dev, ABS_Y,
66 (fujitsu->data[4] << 7) | fujitsu->data[3]);
67 input_report_key(dev, BTN_TOUCH,
68 (fujitsu->data[0] & 0x03) != 2);
69 input_sync(dev);
70 fujitsu->idx = 0;
71 }
72
73 return IRQ_HANDLED;
74}
75
76/*
77 * fujitsu_disconnect() is the opposite of fujitsu_connect()
78 */
79static void fujitsu_disconnect(struct serio *serio)
80{
81 struct fujitsu *fujitsu = serio_get_drvdata(serio);
82
83 input_get_device(fujitsu->dev);
84 input_unregister_device(fujitsu->dev);
85 serio_close(serio);
86 serio_set_drvdata(serio, NULL);
87 input_put_device(fujitsu->dev);
88 kfree(fujitsu);
89}
90
91/*
92 * fujitsu_connect() is the routine that is called when someone adds a
93 * new serio device that supports the Fujitsu protocol and registers it
94 * as input device.
95 */
96static int fujitsu_connect(struct serio *serio, struct serio_driver *drv)
97{
98 struct fujitsu *fujitsu;
99 struct input_dev *input_dev;
100 int err;
101
102 fujitsu = kzalloc(sizeof(struct fujitsu), GFP_KERNEL);
103 input_dev = input_allocate_device();
104 if (!fujitsu || !input_dev) {
105 err = -ENOMEM;
106 goto fail1;
107 }
108
109 fujitsu->serio = serio;
110 fujitsu->dev = input_dev;
111 snprintf(fujitsu->phys, sizeof(fujitsu->phys),
112 "%s/input0", serio->phys);
113
114 input_dev->name = "Fujitsu Serial Touchscreen";
115 input_dev->phys = fujitsu->phys;
116 input_dev->id.bustype = BUS_RS232;
117 input_dev->id.vendor = SERIO_FUJITSU;
118 input_dev->id.product = 0;
119 input_dev->id.version = 0x0100;
120 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
121 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
122
123 input_set_abs_params(input_dev, ABS_X, 0, 4096, 0, 0);
124 input_set_abs_params(input_dev, ABS_Y, 0, 4096, 0, 0);
125 serio_set_drvdata(serio, fujitsu);
126
127 err = serio_open(serio, drv);
128 if (err)
129 goto fail2;
130
131 err = input_register_device(fujitsu->dev);
132 if (err)
133 goto fail3;
134
135 return 0;
136
137 fail3:
138 serio_close(serio);
139 fail2:
140 serio_set_drvdata(serio, NULL);
141 fail1:
142 input_free_device(input_dev);
143 kfree(fujitsu);
144 return err;
145}
146
147/*
148 * The serio driver structure.
149 */
150static const struct serio_device_id fujitsu_serio_ids[] = {
151 {
152 .type = SERIO_RS232,
153 .proto = SERIO_FUJITSU,
154 .id = SERIO_ANY,
155 .extra = SERIO_ANY,
156 },
157 { 0 }
158};
159
160MODULE_DEVICE_TABLE(serio, fujitsu_serio_ids);
161
162static struct serio_driver fujitsu_drv = {
163 .driver = {
164 .name = "fujitsu_ts",
165 },
166 .description = DRIVER_DESC,
167 .id_table = fujitsu_serio_ids,
168 .interrupt = fujitsu_interrupt,
169 .connect = fujitsu_connect,
170 .disconnect = fujitsu_disconnect,
171};
172
173module_serio_driver(fujitsu_drv);