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21#include <linux/errno.h>
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/slab.h>
25#include <linux/input.h>
26#include <linux/serio.h>
27
28#define DRIVER_DESC "Dynapro serial touchscreen driver"
29
30MODULE_AUTHOR("Tias Guns <tias@ulyssis.org>");
31MODULE_DESCRIPTION(DRIVER_DESC);
32MODULE_LICENSE("GPL");
33
34
35
36
37
38#define DYNAPRO_FORMAT_TOUCH_BIT 0x40
39#define DYNAPRO_FORMAT_LENGTH 3
40#define DYNAPRO_RESPONSE_BEGIN_BYTE 0x80
41
42#define DYNAPRO_MIN_XC 0
43#define DYNAPRO_MAX_XC 0x3ff
44#define DYNAPRO_MIN_YC 0
45#define DYNAPRO_MAX_YC 0x3ff
46
47#define DYNAPRO_GET_XC(data) (data[1] | ((data[0] & 0x38) << 4))
48#define DYNAPRO_GET_YC(data) (data[2] | ((data[0] & 0x07) << 7))
49#define DYNAPRO_GET_TOUCHED(data) (DYNAPRO_FORMAT_TOUCH_BIT & data[0])
50
51
52
53
54
55struct dynapro {
56 struct input_dev *dev;
57 struct serio *serio;
58 int idx;
59 unsigned char data[DYNAPRO_FORMAT_LENGTH];
60 char phys[32];
61};
62
63static void dynapro_process_data(struct dynapro *pdynapro)
64{
65 struct input_dev *dev = pdynapro->dev;
66
67 if (DYNAPRO_FORMAT_LENGTH == ++pdynapro->idx) {
68 input_report_abs(dev, ABS_X, DYNAPRO_GET_XC(pdynapro->data));
69 input_report_abs(dev, ABS_Y, DYNAPRO_GET_YC(pdynapro->data));
70 input_report_key(dev, BTN_TOUCH,
71 DYNAPRO_GET_TOUCHED(pdynapro->data));
72 input_sync(dev);
73
74 pdynapro->idx = 0;
75 }
76}
77
78static irqreturn_t dynapro_interrupt(struct serio *serio,
79 unsigned char data, unsigned int flags)
80{
81 struct dynapro *pdynapro = serio_get_drvdata(serio);
82
83 pdynapro->data[pdynapro->idx] = data;
84
85 if (DYNAPRO_RESPONSE_BEGIN_BYTE & pdynapro->data[0])
86 dynapro_process_data(pdynapro);
87 else
88 dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
89 pdynapro->data[0]);
90
91 return IRQ_HANDLED;
92}
93
94static void dynapro_disconnect(struct serio *serio)
95{
96 struct dynapro *pdynapro = serio_get_drvdata(serio);
97
98 input_get_device(pdynapro->dev);
99 input_unregister_device(pdynapro->dev);
100 serio_close(serio);
101 serio_set_drvdata(serio, NULL);
102 input_put_device(pdynapro->dev);
103 kfree(pdynapro);
104}
105
106
107
108
109
110
111
112static int dynapro_connect(struct serio *serio, struct serio_driver *drv)
113{
114 struct dynapro *pdynapro;
115 struct input_dev *input_dev;
116 int err;
117
118 pdynapro = kzalloc(sizeof(struct dynapro), GFP_KERNEL);
119 input_dev = input_allocate_device();
120 if (!pdynapro || !input_dev) {
121 err = -ENOMEM;
122 goto fail1;
123 }
124
125 pdynapro->serio = serio;
126 pdynapro->dev = input_dev;
127 snprintf(pdynapro->phys, sizeof(pdynapro->phys),
128 "%s/input0", serio->phys);
129
130 input_dev->name = "Dynapro Serial TouchScreen";
131 input_dev->phys = pdynapro->phys;
132 input_dev->id.bustype = BUS_RS232;
133 input_dev->id.vendor = SERIO_DYNAPRO;
134 input_dev->id.product = 0;
135 input_dev->id.version = 0x0001;
136 input_dev->dev.parent = &serio->dev;
137 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
138 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
139 input_set_abs_params(pdynapro->dev, ABS_X,
140 DYNAPRO_MIN_XC, DYNAPRO_MAX_XC, 0, 0);
141 input_set_abs_params(pdynapro->dev, ABS_Y,
142 DYNAPRO_MIN_YC, DYNAPRO_MAX_YC, 0, 0);
143
144 serio_set_drvdata(serio, pdynapro);
145
146 err = serio_open(serio, drv);
147 if (err)
148 goto fail2;
149
150 err = input_register_device(pdynapro->dev);
151 if (err)
152 goto fail3;
153
154 return 0;
155
156 fail3: serio_close(serio);
157 fail2: serio_set_drvdata(serio, NULL);
158 fail1: input_free_device(input_dev);
159 kfree(pdynapro);
160 return err;
161}
162
163
164
165
166
167static struct serio_device_id dynapro_serio_ids[] = {
168 {
169 .type = SERIO_RS232,
170 .proto = SERIO_DYNAPRO,
171 .id = SERIO_ANY,
172 .extra = SERIO_ANY,
173 },
174 { 0 }
175};
176
177MODULE_DEVICE_TABLE(serio, dynapro_serio_ids);
178
179static struct serio_driver dynapro_drv = {
180 .driver = {
181 .name = "dynapro",
182 },
183 .description = DRIVER_DESC,
184 .id_table = dynapro_serio_ids,
185 .interrupt = dynapro_interrupt,
186 .connect = dynapro_connect,
187 .disconnect = dynapro_disconnect,
188};
189
190module_serio_driver(dynapro_drv);
191