1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29#include <linux/errno.h>
30#include <linux/kernel.h>
31#include <linux/module.h>
32#include <linux/slab.h>
33#include <linux/input.h>
34#include <linux/serio.h>
35#include <linux/init.h>
36
37#define DRIVER_DESC "Gunze AHL-51S touchscreen driver"
38
39MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
40MODULE_DESCRIPTION(DRIVER_DESC);
41MODULE_LICENSE("GPL");
42
43
44
45
46
47#define GUNZE_MAX_LENGTH 10
48
49
50
51
52
53struct gunze {
54 struct input_dev *dev;
55 struct serio *serio;
56 int idx;
57 unsigned char data[GUNZE_MAX_LENGTH];
58 char phys[32];
59};
60
61static void gunze_process_packet(struct gunze* gunze)
62{
63 struct input_dev *dev = gunze->dev;
64
65 if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' ||
66 (gunze->data[0] != 'T' && gunze->data[0] != 'R')) {
67 printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data);
68 return;
69 }
70
71 input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));
72 input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));
73 input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');
74 input_sync(dev);
75}
76
77static irqreturn_t gunze_interrupt(struct serio *serio,
78 unsigned char data, unsigned int flags)
79{
80 struct gunze* gunze = serio_get_drvdata(serio);
81
82 if (data == '\r') {
83 gunze_process_packet(gunze);
84 gunze->idx = 0;
85 } else {
86 if (gunze->idx < GUNZE_MAX_LENGTH)
87 gunze->data[gunze->idx++] = data;
88 }
89 return IRQ_HANDLED;
90}
91
92
93
94
95
96static void gunze_disconnect(struct serio *serio)
97{
98 struct gunze *gunze = serio_get_drvdata(serio);
99
100 input_get_device(gunze->dev);
101 input_unregister_device(gunze->dev);
102 serio_close(serio);
103 serio_set_drvdata(serio, NULL);
104 input_put_device(gunze->dev);
105 kfree(gunze);
106}
107
108
109
110
111
112
113
114static int gunze_connect(struct serio *serio, struct serio_driver *drv)
115{
116 struct gunze *gunze;
117 struct input_dev *input_dev;
118 int err;
119
120 gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
121 input_dev = input_allocate_device();
122 if (!gunze || !input_dev) {
123 err = -ENOMEM;
124 goto fail1;
125 }
126
127 gunze->serio = serio;
128 gunze->dev = input_dev;
129 snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys);
130
131 input_dev->name = "Gunze AHL-51S TouchScreen";
132 input_dev->phys = gunze->phys;
133 input_dev->id.bustype = BUS_RS232;
134 input_dev->id.vendor = SERIO_GUNZE;
135 input_dev->id.product = 0x0051;
136 input_dev->id.version = 0x0100;
137 input_dev->dev.parent = &serio->dev;
138 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
139 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
140 input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0);
141 input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0);
142
143 serio_set_drvdata(serio, gunze);
144
145 err = serio_open(serio, drv);
146 if (err)
147 goto fail2;
148
149 err = input_register_device(gunze->dev);
150 if (err)
151 goto fail3;
152
153 return 0;
154
155 fail3: serio_close(serio);
156 fail2: serio_set_drvdata(serio, NULL);
157 fail1: input_free_device(input_dev);
158 kfree(gunze);
159 return err;
160}
161
162
163
164
165
166static struct serio_device_id gunze_serio_ids[] = {
167 {
168 .type = SERIO_RS232,
169 .proto = SERIO_GUNZE,
170 .id = SERIO_ANY,
171 .extra = SERIO_ANY,
172 },
173 { 0 }
174};
175
176MODULE_DEVICE_TABLE(serio, gunze_serio_ids);
177
178static struct serio_driver gunze_drv = {
179 .driver = {
180 .name = "gunze",
181 },
182 .description = DRIVER_DESC,
183 .id_table = gunze_serio_ids,
184 .interrupt = gunze_interrupt,
185 .connect = gunze_connect,
186 .disconnect = gunze_disconnect,
187};
188
189
190
191
192
193static int __init gunze_init(void)
194{
195 return serio_register_driver(&gunze_drv);
196}
197
198static void __exit gunze_exit(void)
199{
200 serio_unregister_driver(&gunze_drv);
201}
202
203module_init(gunze_init);
204module_exit(gunze_exit);
205