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dcb69dd0 SP |
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 int ams_input_kthread(void *data) | |
31 | { | |
32 | s8 x, y, z; | |
33 | ||
34 | while (!kthread_should_stop()) { | |
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(ams_info.idev, ABS_X, invert ? -x : x); | |
44 | input_report_abs(ams_info.idev, ABS_Y, invert ? -y : y); | |
45 | input_report_abs(ams_info.idev, ABS_Z, z); | |
46 | ||
47 | input_sync(ams_info.idev); | |
48 | ||
49 | mutex_unlock(&ams_info.lock); | |
50 | ||
51 | msleep(25); | |
52 | } | |
53 | ||
54 | return 0; | |
55 | } | |
56 | ||
57 | static int ams_input_open(struct input_dev *dev) | |
58 | { | |
59 | ams_info.kthread = kthread_run(ams_input_kthread, NULL, "kams"); | |
60 | return IS_ERR(ams_info.kthread) ? PTR_ERR(ams_info.kthread) : 0; | |
61 | } | |
62 | ||
63 | static void ams_input_close(struct input_dev *dev) | |
64 | { | |
65 | kthread_stop(ams_info.kthread); | |
66 | } | |
67 | ||
68 | /* Call with ams_info.lock held! */ | |
69 | static void ams_input_enable(void) | |
70 | { | |
71 | s8 x, y, z; | |
72 | ||
73 | if (ams_info.idev) | |
74 | return; | |
75 | ||
76 | ams_sensors(&x, &y, &z); | |
77 | ams_info.xcalib = x; | |
78 | ams_info.ycalib = y; | |
79 | ams_info.zcalib = z; | |
80 | ||
81 | ams_info.idev = input_allocate_device(); | |
82 | if (!ams_info.idev) | |
83 | return; | |
84 | ||
85 | ams_info.idev->name = "Apple Motion Sensor"; | |
86 | ams_info.idev->id.bustype = ams_info.bustype; | |
87 | ams_info.idev->id.vendor = 0; | |
88 | ams_info.idev->open = ams_input_open; | |
89 | ams_info.idev->close = ams_input_close; | |
90 | ams_info.idev->cdev.dev = &ams_info.of_dev->dev; | |
91 | ||
92 | input_set_abs_params(ams_info.idev, ABS_X, -50, 50, 3, 0); | |
93 | input_set_abs_params(ams_info.idev, ABS_Y, -50, 50, 3, 0); | |
94 | input_set_abs_params(ams_info.idev, ABS_Z, -50, 50, 3, 0); | |
95 | ||
96 | set_bit(EV_ABS, ams_info.idev->evbit); | |
97 | set_bit(EV_KEY, ams_info.idev->evbit); | |
98 | set_bit(BTN_TOUCH, ams_info.idev->keybit); | |
99 | ||
100 | if (input_register_device(ams_info.idev)) { | |
101 | input_free_device(ams_info.idev); | |
102 | ams_info.idev = NULL; | |
103 | return; | |
104 | } | |
105 | } | |
106 | ||
107 | /* Call with ams_info.lock held! */ | |
108 | static void ams_input_disable(void) | |
109 | { | |
110 | if (ams_info.idev) { | |
111 | input_unregister_device(ams_info.idev); | |
112 | ams_info.idev = NULL; | |
113 | } | |
114 | } | |
115 | ||
116 | static ssize_t ams_input_show_joystick(struct device *dev, | |
117 | struct device_attribute *attr, char *buf) | |
118 | { | |
119 | return sprintf(buf, "%d\n", joystick); | |
120 | } | |
121 | ||
122 | static ssize_t ams_input_store_joystick(struct device *dev, | |
123 | struct device_attribute *attr, const char *buf, size_t count) | |
124 | { | |
125 | if (sscanf(buf, "%d\n", &joystick) != 1) | |
126 | return -EINVAL; | |
127 | ||
128 | mutex_lock(&ams_info.lock); | |
129 | ||
130 | if (joystick) | |
131 | ams_input_enable(); | |
132 | else | |
133 | ams_input_disable(); | |
134 | ||
135 | mutex_unlock(&ams_info.lock); | |
136 | ||
137 | return count; | |
138 | } | |
139 | ||
140 | static DEVICE_ATTR(joystick, S_IRUGO | S_IWUSR, | |
141 | ams_input_show_joystick, ams_input_store_joystick); | |
142 | ||
143 | /* Call with ams_info.lock held! */ | |
144 | int ams_input_init(void) | |
145 | { | |
146 | int result; | |
147 | ||
148 | result = device_create_file(&ams_info.of_dev->dev, &dev_attr_joystick); | |
149 | ||
150 | if (!result && joystick) | |
151 | ams_input_enable(); | |
152 | return result; | |
153 | } | |
154 | ||
155 | /* Call with ams_info.lock held! */ | |
156 | void ams_input_exit() | |
157 | { | |
158 | ams_input_disable(); | |
159 | device_remove_file(&ams_info.of_dev->dev, &dev_attr_joystick); | |
160 | } |