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
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/*
* Driver for simulating a mouse on GPIO lines.
*
* Copyright (C) 2007 Atmel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/input-polldev.h>
#include <linux/gpio.h>
#include <linux/gpio_mouse.h>
/*
* Timer function which is run every scan_ms ms when the device is opened.
* The dev input variable is set to the the input_dev pointer.
*/
static void gpio_mouse_scan(struct input_polled_dev *dev)
{
struct gpio_mouse_platform_data *gpio = dev->private;
struct input_dev *input = dev->input;
int x, y;
if (gpio->bleft >= 0)
input_report_key(input, BTN_LEFT,
gpio_get_value(gpio->bleft) ^ gpio->polarity);
if (gpio->bmiddle >= 0)
input_report_key(input, BTN_MIDDLE,
gpio_get_value(gpio->bmiddle) ^ gpio->polarity);
if (gpio->bright >= 0)
input_report_key(input, BTN_RIGHT,
gpio_get_value(gpio->bright) ^ gpio->polarity);
x = (gpio_get_value(gpio->right) ^ gpio->polarity)
- (gpio_get_value(gpio->left) ^ gpio->polarity);
y = (gpio_get_value(gpio->down) ^ gpio->polarity)
- (gpio_get_value(gpio->up) ^ gpio->polarity);
input_report_rel(input, REL_X, x);
input_report_rel(input, REL_Y, y);
input_sync(input);
}
static int gpio_mouse_probe(struct platform_device *pdev)
{
struct gpio_mouse_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct input_polled_dev *input_poll;
struct input_dev *input;
int pin, i;
int error;
if (!pdata) {
dev_err(&pdev->dev, "no platform data\n");
error = -ENXIO;
goto out;
}
if (pdata->scan_ms < 0) {
dev_err(&pdev->dev, "invalid scan time\n");
error = -EINVAL;
goto out;
}
for (i = 0; i < GPIO_MOUSE_PIN_MAX; i++) {
pin = pdata->pins[i];
if (pin < 0) {
if (i <= GPIO_MOUSE_PIN_RIGHT) {
/* Mouse direction is required. */
dev_err(&pdev->dev,
"missing GPIO for directions\n");
error = -EINVAL;
goto out_free_gpios;
}
if (i == GPIO_MOUSE_PIN_BLEFT)
dev_dbg(&pdev->dev, "no left button defined\n");
} else {
error = gpio_request(pin, "gpio_mouse");
if (error) {
dev_err(&pdev->dev, "fail %d pin (%d idx)\n",
pin, i);
goto out_free_gpios;
}
gpio_direction_input(pin);
}
}
input_poll = input_allocate_polled_device();
if (!input_poll) {
dev_err(&pdev->dev, "not enough memory for input device\n");
error = -ENOMEM;
goto out_free_gpios;
}
platform_set_drvdata(pdev, input_poll);
/* set input-polldev handlers */
input_poll->private = pdata;
input_poll->poll = gpio_mouse_scan;
input_poll->poll_interval = pdata->scan_ms;
input = input_poll->input;
input->name = pdev->name;
input->id.bustype = BUS_HOST;
input->dev.parent = &pdev->dev;
input_set_capability(input, EV_REL, REL_X);
input_set_capability(input, EV_REL, REL_Y);
if (pdata->bleft >= 0)
input_set_capability(input, EV_KEY, BTN_LEFT);
if (pdata->bmiddle >= 0)
input_set_capability(input, EV_KEY, BTN_MIDDLE);
if (pdata->bright >= 0)
input_set_capability(input, EV_KEY, BTN_RIGHT);
error = input_register_polled_device(input_poll);
if (error) {
dev_err(&pdev->dev, "could not register input device\n");
goto out_free_polldev;
}
dev_dbg(&pdev->dev, "%d ms scan time, buttons: %s%s%s\n",
pdata->scan_ms,
pdata->bleft < 0 ? "" : "left ",
pdata->bmiddle < 0 ? "" : "middle ",
pdata->bright < 0 ? "" : "right");
return 0;
out_free_polldev:
input_free_polled_device(input_poll);
out_free_gpios:
while (--i >= 0) {
pin = pdata->pins[i];
if (pin)
gpio_free(pin);
}
out:
return error;
}
static int gpio_mouse_remove(struct platform_device *pdev)
{
struct input_polled_dev *input = platform_get_drvdata(pdev);
struct gpio_mouse_platform_data *pdata = input->private;
int pin, i;
input_unregister_polled_device(input);
input_free_polled_device(input);
for (i = 0; i < GPIO_MOUSE_PIN_MAX; i++) {
pin = pdata->pins[i];
if (pin >= 0)
gpio_free(pin);
}
return 0;
}
static struct platform_driver gpio_mouse_device_driver = {
.probe = gpio_mouse_probe,
.remove = gpio_mouse_remove,
.driver = {
.name = "gpio_mouse",
}
};
module_platform_driver(gpio_mouse_device_driver);
MODULE_AUTHOR("Hans-Christian Egtvedt <egtvedt@samfundet.no>");
MODULE_DESCRIPTION("GPIO mouse driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:gpio_mouse"); /* work with hotplug and coldplug */
|
