1 /*
2 * Apple Motion Sensor driver (joystick emulation)
3 *
4 * Copyright (C) 2005 Stelian Pop (stelian@popies.net)
5 * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13 #include <linux/module.h>
14
15 #include <linux/types.h>
16 #include <linux/errno.h>
17 #include <linux/init.h>
18 #include <linux/delay.h>
19
20 #include "ams.h"
21
22 static unsigned int joystick;
23 module_param(joystick, bool, 0644);
24 MODULE_PARM_DESC(joystick, "Enable the input class device on module load");
25
26 static unsigned int invert;
27 module_param(invert, bool, 0644);
28 MODULE_PARM_DESC(invert, "Invert input data on X and Y axis");
29
30 static void ams_idev_poll(struct input_polled_dev *dev)
31 {
32 struct input_dev *idev = dev->input;
33 s8 x, y, z;
34
35 mutex_lock(&ams_info.lock);
36
37 ams_sensors(&x, &y, &z);
38
39 x -= ams_info.xcalib;
40 y -= ams_info.ycalib;
41 z -= ams_info.zcalib;
42
43 input_report_abs(idev, ABS_X, invert ? -x : x);
44 input_report_abs(idev, ABS_Y, invert ? -y : y);
45 input_report_abs(idev, ABS_Z, z);
46
47 input_sync(idev);
48
49 mutex_unlock(&ams_info.lock);
50 }
51
52 /* Call with ams_info.lock held! */
53 static void ams_input_enable(void)
54 {
55 struct input_dev *input;
56 s8 x, y, z;
57
58 if (ams_info.idev)
59 return;
60
61 ams_sensors(&x, &y, &z);
62 ams_info.xcalib = x;
63 ams_info.ycalib = y;
64 ams_info.zcalib = z;
65
66 ams_info.idev = input_allocate_polled_device();
67 if (!ams_info.idev)
68 return;
69
70 ams_info.idev->poll = ams_idev_poll;
71 ams_info.idev->poll_interval = 25;
72
73 input = ams_info.idev->input;
74 input->name = "Apple Motion Sensor";
75 input->id.bustype = ams_info.bustype;
76 input->id.vendor = 0;
77 input->dev.parent = &ams_info.of_dev->dev;
78
79 input_set_abs_params(input, ABS_X, -50, 50, 3, 0);
80 input_set_abs_params(input, ABS_Y, -50, 50, 3, 0);
81 input_set_abs_params(input, ABS_Z, -50, 50, 3, 0);
82
83 set_bit(EV_ABS, input->evbit);
84 set_bit(EV_KEY, input->evbit);
85 set_bit(BTN_TOUCH, input->keybit);
86
87 if (input_register_polled_device(ams_info.idev)) {
88 input_free_polled_device(ams_info.idev);
89 ams_info.idev = NULL;
90 return;
91 }
92 }
93
94 /* Call with ams_info.lock held! */
95 static void ams_input_disable(void)
96 {
97 if (ams_info.idev) {
98 input_unregister_polled_device(ams_info.idev);
99 input_free_polled_device(ams_info.idev);
100 ams_info.idev = NULL;
101 }
102 }
103
104 static ssize_t ams_input_show_joystick(struct device *dev,
105 struct device_attribute *attr, char *buf)
106 {
107 return sprintf(buf, "%d\n", joystick);
108 }
109
110 static ssize_t ams_input_store_joystick(struct device *dev,
111 struct device_attribute *attr, const char *buf, size_t count)
112 {
113 if (sscanf(buf, "%d\n", &joystick) != 1)
114 return -EINVAL;
115
116 mutex_lock(&ams_info.lock);
117
118 if (joystick)
119 ams_input_enable();
120 else
121 ams_input_disable();
122
123 mutex_unlock(&ams_info.lock);
124
125 return count;
126 }
127
128 static DEVICE_ATTR(joystick, S_IRUGO | S_IWUSR,
129 ams_input_show_joystick, ams_input_store_joystick);
130
131 /* Call with ams_info.lock held! */
132 int ams_input_init(void)
133 {
134 int result;
135
136 result = device_create_file(&ams_info.of_dev->dev, &dev_attr_joystick);
137
138 if (!result && joystick)
139 ams_input_enable();
140 return result;
141 }
142
143 /* Call with ams_info.lock held! */
144 void ams_input_exit(void)
145 {
146 ams_input_disable();
147 device_remove_file(&ams_info.of_dev->dev, &dev_attr_joystick);
148 }
149
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