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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, S_IRUGO); | |
24 | MODULE_PARM_DESC(joystick, "Enable the input class device on module load"); | |
25 | ||
26 | static unsigned int invert; | |
27 | module_param(invert, bool, S_IWUSR | S_IRUGO); | |
28 | MODULE_PARM_DESC(invert, "Invert input data on X and Y axis"); | |
29 | ||
30 | static DEFINE_MUTEX(ams_input_mutex); | |
31 | ||
32 | static void ams_idev_poll(struct input_polled_dev *dev) | |
33 | { | |
34 | struct input_dev *idev = dev->input; | |
35 | s8 x, y, z; | |
36 | ||
37 | mutex_lock(&ams_info.lock); | |
38 | ||
39 | ams_sensors(&x, &y, &z); | |
40 | ||
41 | x -= ams_info.xcalib; | |
42 | y -= ams_info.ycalib; | |
43 | z -= ams_info.zcalib; | |
44 | ||
45 | input_report_abs(idev, ABS_X, invert ? -x : x); | |
46 | input_report_abs(idev, ABS_Y, invert ? -y : y); | |
47 | input_report_abs(idev, ABS_Z, z); | |
48 | ||
49 | input_sync(idev); | |
50 | ||
51 | mutex_unlock(&ams_info.lock); | |
52 | } | |
53 | ||
54 | /* Call with ams_info.lock held! */ | |
55 | static int ams_input_enable(void) | |
56 | { | |
57 | struct input_dev *input; | |
58 | s8 x, y, z; | |
59 | int error; | |
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 -ENOMEM; | |
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 | error = input_register_polled_device(ams_info.idev); | |
88 | if (error) { | |
89 | input_free_polled_device(ams_info.idev); | |
90 | ams_info.idev = NULL; | |
91 | return error; | |
92 | } | |
93 | ||
94 | joystick = 1; | |
95 | ||
96 | return 0; | |
97 | } | |
98 | ||
99 | static void ams_input_disable(void) | |
100 | { | |
101 | if (ams_info.idev) { | |
102 | input_unregister_polled_device(ams_info.idev); | |
103 | input_free_polled_device(ams_info.idev); | |
104 | ams_info.idev = NULL; | |
105 | } | |
106 | ||
107 | joystick = 0; | |
108 | } | |
109 | ||
110 | static ssize_t ams_input_show_joystick(struct device *dev, | |
111 | struct device_attribute *attr, char *buf) | |
112 | { | |
113 | return sprintf(buf, "%d\n", joystick); | |
114 | } | |
115 | ||
116 | static ssize_t ams_input_store_joystick(struct device *dev, | |
117 | struct device_attribute *attr, const char *buf, size_t count) | |
118 | { | |
119 | unsigned long enable; | |
120 | int error = 0; | |
121 | ||
122 | if (strict_strtoul(buf, 0, &enable) || enable > 1) | |
123 | return -EINVAL; | |
124 | ||
125 | mutex_lock(&ams_input_mutex); | |
126 | ||
127 | if (enable != joystick) { | |
128 | if (enable) | |
129 | error = ams_input_enable(); | |
130 | else | |
131 | ams_input_disable(); | |
132 | } | |
133 | ||
134 | mutex_unlock(&ams_input_mutex); | |
135 | ||
136 | return error ? error : count; | |
137 | } | |
138 | ||
139 | static DEVICE_ATTR(joystick, S_IRUGO | S_IWUSR, | |
140 | ams_input_show_joystick, ams_input_store_joystick); | |
141 | ||
142 | int ams_input_init(void) | |
143 | { | |
144 | if (joystick) | |
145 | ams_input_enable(); | |
146 | ||
147 | return device_create_file(&ams_info.of_dev->dev, &dev_attr_joystick); | |
148 | } | |
149 | ||
150 | void ams_input_exit(void) | |
151 | { | |
152 | device_remove_file(&ams_info.of_dev->dev, &dev_attr_joystick); | |
153 | ||
154 | mutex_lock(&ams_input_mutex); | |
155 | ams_input_disable(); | |
156 | mutex_unlock(&ams_input_mutex); | |
157 | } |