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24#include <linux/errno.h>
25#include <linux/kernel.h>
26#include <linux/module.h>
27#include <linux/slab.h>
28#include <linux/input.h>
29#include <linux/serio.h>
30#include <linux/init.h>
31
32#define DRIVER_DESC "Touchwindow serial touchscreen driver"
33
34MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
35MODULE_DESCRIPTION(DRIVER_DESC);
36MODULE_LICENSE("GPL");
37
38
39
40
41
42#define TW_LENGTH 3
43
44#define TW_MIN_XC 0
45#define TW_MAX_XC 0xff
46#define TW_MIN_YC 0
47#define TW_MAX_YC 0xff
48
49
50
51
52
53struct tw {
54 struct input_dev *dev;
55 struct serio *serio;
56 int idx;
57 int touched;
58 unsigned char data[TW_LENGTH];
59 char phys[32];
60};
61
62static irqreturn_t tw_interrupt(struct serio *serio,
63 unsigned char data, unsigned int flags)
64{
65 struct tw *tw = serio_get_drvdata(serio);
66 struct input_dev *dev = tw->dev;
67
68 if (data) {
69 tw->touched = 1;
70 tw->data[tw->idx++] = data;
71
72 if (tw->idx == TW_LENGTH && tw->data[1] == tw->data[2]) {
73 input_report_abs(dev, ABS_X, tw->data[0]);
74 input_report_abs(dev, ABS_Y, tw->data[1]);
75 input_report_key(dev, BTN_TOUCH, 1);
76 input_sync(dev);
77 tw->idx = 0;
78 }
79 } else if (tw->touched) {
80 input_report_key(dev, BTN_TOUCH, 0);
81 input_sync(dev);
82 tw->idx = 0;
83 tw->touched = 0;
84 }
85
86 return IRQ_HANDLED;
87}
88
89
90
91
92
93static void tw_disconnect(struct serio *serio)
94{
95 struct tw *tw = serio_get_drvdata(serio);
96
97 input_get_device(tw->dev);
98 input_unregister_device(tw->dev);
99 serio_close(serio);
100 serio_set_drvdata(serio, NULL);
101 input_put_device(tw->dev);
102 kfree(tw);
103}
104
105
106
107
108
109
110
111static int tw_connect(struct serio *serio, struct serio_driver *drv)
112{
113 struct tw *tw;
114 struct input_dev *input_dev;
115 int err;
116
117 tw = kzalloc(sizeof(struct tw), GFP_KERNEL);
118 input_dev = input_allocate_device();
119 if (!tw || !input_dev) {
120 err = -ENOMEM;
121 goto fail1;
122 }
123
124 tw->serio = serio;
125 tw->dev = input_dev;
126 snprintf(tw->phys, sizeof(tw->phys), "%s/input0", serio->phys);
127
128 input_dev->name = "Touchwindow Serial TouchScreen";
129 input_dev->phys = tw->phys;
130 input_dev->id.bustype = BUS_RS232;
131 input_dev->id.vendor = SERIO_TOUCHWIN;
132 input_dev->id.product = 0;
133 input_dev->id.version = 0x0100;
134 input_dev->dev.parent = &serio->dev;
135 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
136 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
137 input_set_abs_params(tw->dev, ABS_X, TW_MIN_XC, TW_MAX_XC, 0, 0);
138 input_set_abs_params(tw->dev, ABS_Y, TW_MIN_YC, TW_MAX_YC, 0, 0);
139
140 serio_set_drvdata(serio, tw);
141
142 err = serio_open(serio, drv);
143 if (err)
144 goto fail2;
145
146 err = input_register_device(tw->dev);
147 if (err)
148 goto fail3;
149
150 return 0;
151
152 fail3: serio_close(serio);
153 fail2: serio_set_drvdata(serio, NULL);
154 fail1: input_free_device(input_dev);
155 kfree(tw);
156 return err;
157}
158
159
160
161
162
163static struct serio_device_id tw_serio_ids[] = {
164 {
165 .type = SERIO_RS232,
166 .proto = SERIO_TOUCHWIN,
167 .id = SERIO_ANY,
168 .extra = SERIO_ANY,
169 },
170 { 0 }
171};
172
173MODULE_DEVICE_TABLE(serio, tw_serio_ids);
174
175static struct serio_driver tw_drv = {
176 .driver = {
177 .name = "touchwin",
178 },
179 .description = DRIVER_DESC,
180 .id_table = tw_serio_ids,
181 .interrupt = tw_interrupt,
182 .connect = tw_connect,
183 .disconnect = tw_disconnect,
184};
185
186
187
188
189
190static int __init tw_init(void)
191{
192 return serio_register_driver(&tw_drv);
193}
194
195static void __exit tw_exit(void)
196{
197 serio_unregister_driver(&tw_drv);
198}
199
200module_init(tw_init);
201module_exit(tw_exit);
202