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
23 MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
24 MODULE_DESCRIPTION(DRIVER_DESC);
25 MODULE_LICENSE("GPL");
26
27 #define FUJITSU_LENGTH 5
28
29 /*
30 * Per-touchscreen data.
31 */
32 struct 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 */
48 static 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 */
84 static 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 */
101 static 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 */
155 static 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
165 MODULE_DEVICE_TABLE(serio, fujitsu_serio_ids);
166
167 static 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
178 static int __init fujitsu_init(void)
179 {
180 return serio_register_driver(&fujitsu_drv);
181 }
182
183 static void __exit fujitsu_exit(void)
184 {
185 serio_unregister_driver(&fujitsu_drv);
186 }
187
188 module_init(fujitsu_init);
189 module_exit(fujitsu_exit);
190
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