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Dmitry Torokhov85f202d2007-07-18 00:37:01 -04001/*
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>
Dmitry Torokhov85f202d2007-07-18 00:37:01 -040019
20#define DRIVER_DESC "Fujitsu serial touchscreen driver"
21
22MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
23MODULE_DESCRIPTION(DRIVER_DESC);
24MODULE_LICENSE("GPL");
25
26#define FUJITSU_LENGTH 5
27
28/*
29 * Per-touchscreen data.
30 */
31struct fujitsu {
32 struct input_dev *dev;
33 struct serio *serio;
34 int idx;
35 unsigned char data[FUJITSU_LENGTH];
36 char phys[32];
37};
38
39/*
40 * Decode serial data (5 bytes per packet)
41 * First byte
42 * 1 C 0 0 R S S S
43 * Where C is 1 while in calibration mode (which we don't use)
44 * R is 1 when no coordinate corection was done.
45 * S are button state
46 */
47static irqreturn_t fujitsu_interrupt(struct serio *serio,
48 unsigned char data, unsigned int flags)
49{
50 struct fujitsu *fujitsu = serio_get_drvdata(serio);
51 struct input_dev *dev = fujitsu->dev;
52
53 if (fujitsu->idx == 0) {
54 /* resync skip until start of frame */
55 if ((data & 0xf0) != 0x80)
56 return IRQ_HANDLED;
57 } else {
58 /* resync skip garbage */
59 if (data & 0x80) {
60 fujitsu->idx = 0;
61 return IRQ_HANDLED;
62 }
63 }
64
65 fujitsu->data[fujitsu->idx++] = data;
66 if (fujitsu->idx == FUJITSU_LENGTH) {
67 input_report_abs(dev, ABS_X,
68 (fujitsu->data[2] << 7) | fujitsu->data[1]);
69 input_report_abs(dev, ABS_Y,
70 (fujitsu->data[4] << 7) | fujitsu->data[3]);
71 input_report_key(dev, BTN_TOUCH,
72 (fujitsu->data[0] & 0x03) != 2);
73 input_sync(dev);
74 fujitsu->idx = 0;
75 }
76
77 return IRQ_HANDLED;
78}
79
80/*
81 * fujitsu_disconnect() is the opposite of fujitsu_connect()
82 */
83static void fujitsu_disconnect(struct serio *serio)
84{
85 struct fujitsu *fujitsu = serio_get_drvdata(serio);
86
87 input_get_device(fujitsu->dev);
88 input_unregister_device(fujitsu->dev);
89 serio_close(serio);
90 serio_set_drvdata(serio, NULL);
91 input_put_device(fujitsu->dev);
92 kfree(fujitsu);
93}
94
95/*
96 * fujitsu_connect() is the routine that is called when someone adds a
97 * new serio device that supports the Fujitsu protocol and registers it
98 * as input device.
99 */
100static int fujitsu_connect(struct serio *serio, struct serio_driver *drv)
101{
102 struct fujitsu *fujitsu;
103 struct input_dev *input_dev;
104 int err;
105
106 fujitsu = kzalloc(sizeof(struct fujitsu), GFP_KERNEL);
107 input_dev = input_allocate_device();
108 if (!fujitsu || !input_dev) {
109 err = -ENOMEM;
110 goto fail1;
111 }
112
113 fujitsu->serio = serio;
114 fujitsu->dev = input_dev;
115 snprintf(fujitsu->phys, sizeof(fujitsu->phys),
116 "%s/input0", serio->phys);
117
118 input_dev->name = "Fujitsu Serial Touchscreen";
119 input_dev->phys = fujitsu->phys;
120 input_dev->id.bustype = BUS_RS232;
121 input_dev->id.vendor = SERIO_FUJITSU;
122 input_dev->id.product = 0;
123 input_dev->id.version = 0x0100;
Jiri Slaby7b19ada2007-10-18 23:40:32 -0700124 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
125 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
Dmitry Torokhov85f202d2007-07-18 00:37:01 -0400126
127 input_set_abs_params(input_dev, ABS_X, 0, 4096, 0, 0);
128 input_set_abs_params(input_dev, ABS_Y, 0, 4096, 0, 0);
129 serio_set_drvdata(serio, fujitsu);
130
131 err = serio_open(serio, drv);
132 if (err)
133 goto fail2;
134
135 err = input_register_device(fujitsu->dev);
136 if (err)
137 goto fail3;
138
139 return 0;
140
141 fail3:
142 serio_close(serio);
143 fail2:
144 serio_set_drvdata(serio, NULL);
145 fail1:
146 input_free_device(input_dev);
147 kfree(fujitsu);
148 return err;
149}
150
151/*
152 * The serio driver structure.
153 */
154static struct serio_device_id fujitsu_serio_ids[] = {
155 {
156 .type = SERIO_RS232,
157 .proto = SERIO_FUJITSU,
158 .id = SERIO_ANY,
159 .extra = SERIO_ANY,
160 },
161 { 0 }
162};
163
164MODULE_DEVICE_TABLE(serio, fujitsu_serio_ids);
165
166static struct serio_driver fujitsu_drv = {
167 .driver = {
168 .name = "fujitsu_ts",
169 },
170 .description = DRIVER_DESC,
171 .id_table = fujitsu_serio_ids,
172 .interrupt = fujitsu_interrupt,
173 .connect = fujitsu_connect,
174 .disconnect = fujitsu_disconnect,
175};
176
Axel Lin65ac9f72012-04-03 23:50:17 -0700177module_serio_driver(fujitsu_drv);