aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/hwmon/ams/ams-input.c
blob: 8a712392cd3829a32dd471f50a557aaa8e774cc3 (plain) (blame)
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
/*
 * Apple Motion Sensor driver (joystick emulation)
 *
 * Copyright (C) 2005 Stelian Pop (stelian@popies.net)
 * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/module.h>

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/delay.h>

#include "ams.h"

static unsigned int joystick;
module_param(joystick, bool, S_IRUGO);
MODULE_PARM_DESC(joystick, "Enable the input class device on module load");

static unsigned int invert;
module_param(invert, bool, S_IWUSR | S_IRUGO);
MODULE_PARM_DESC(invert, "Invert input data on X and Y axis");

static DEFINE_MUTEX(ams_input_mutex);

static void ams_idev_poll(struct input_polled_dev *dev)
{
	struct input_dev *idev = dev->input;
	s8 x, y, z;

	mutex_lock(&ams_info.lock);

	ams_sensors(&x, &y, &z);

	x -= ams_info.xcalib;
	y -= ams_info.ycalib;
	z -= ams_info.zcalib;

	input_report_abs(idev, ABS_X, invert ? -x : x);
	input_report_abs(idev, ABS_Y, invert ? -y : y);
	input_report_abs(idev, ABS_Z, z);

	input_sync(idev);

	mutex_unlock(&ams_info.lock);
}

/* Call with ams_info.lock held! */
static int ams_input_enable(void)
{
	struct input_dev *input;
	s8 x, y, z;
	int error;

	ams_sensors(&x, &y, &z);
	ams_info.xcalib = x;
	ams_info.ycalib = y;
	ams_info.zcalib = z;

	ams_info.idev = input_allocate_polled_device();
	if (!ams_info.idev)
		return -ENOMEM;

	ams_info.idev->poll = ams_idev_poll;
	ams_info.idev->poll_interval = 25;

	input = ams_info.idev->input;
	input->name = "Apple Motion Sensor";
	input->id.bustype = ams_info.bustype;
	input->id.vendor = 0;
	input->dev.parent = &ams_info.of_dev->dev;

	input_set_abs_params(input, ABS_X, -50, 50, 3, 0);
	input_set_abs_params(input, ABS_Y, -50, 50, 3, 0);
	input_set_abs_params(input, ABS_Z, -50, 50, 3, 0);

	set_bit(EV_ABS, input->evbit);
	set_bit(EV_KEY, input->evbit);
	set_bit(BTN_TOUCH, input->keybit);

	error = input_register_polled_device(ams_info.idev);
	if (error) {
		input_free_polled_device(ams_info.idev);
		ams_info.idev = NULL;
		return error;
	}

	joystick = 1;

	return 0;
}

static void ams_input_disable(void)
{
	if (ams_info.idev) {
		input_unregister_polled_device(ams_info.idev);
		input_free_polled_device(ams_info.idev);
		ams_info.idev = NULL;
	}

	joystick = 0;
}

static ssize_t ams_input_show_joystick(struct device *dev,
	struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%d\n", joystick);
}

static ssize_t ams_input_store_joystick(struct device *dev,
	struct device_attribute *attr, const char *buf, size_t count)
{
	unsigned long enable;
	int error = 0;

	if (strict_strtoul(buf, 0, &enable) || enable > 1)
		return -EINVAL;

	mutex_lock(&ams_input_mutex);

	if (enable != joystick) {
		if (enable)
			error = ams_input_enable();
		else
			ams_input_disable();
	}

	mutex_unlock(&ams_input_mutex);

	return error ? error : count;
}

static DEVICE_ATTR(joystick, S_IRUGO | S_IWUSR,
	ams_input_show_joystick, ams_input_store_joystick);

int ams_input_init(void)
{
	if (joystick)
		ams_input_enable();

	return device_create_file(&ams_info.of_dev->dev, &dev_attr_joystick);
}

void ams_input_exit(void)
{
	device_remove_file(&ams_info.of_dev->dev, &dev_attr_joystick);

	mutex_lock(&ams_input_mutex);
	ams_input_disable();
	mutex_unlock(&ams_input_mutex);
}