i2c-eg20t: change timeout value 50msec to 1000msec
[zen-stable.git] / drivers / macintosh / ams / ams-input.c
blobb27e530a87a4dc6f17046de52c22011efbf7da36
1 /*
2 * Apple Motion Sensor driver (joystick emulation)
4 * Copyright (C) 2005 Stelian Pop (stelian@popies.net)
5 * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
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.
13 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/errno.h>
17 #include <linux/init.h>
18 #include <linux/delay.h>
20 #include "ams.h"
22 static bool joystick;
23 module_param(joystick, bool, S_IRUGO);
24 MODULE_PARM_DESC(joystick, "Enable the input class device on module load");
26 static bool invert;
27 module_param(invert, bool, S_IWUSR | S_IRUGO);
28 MODULE_PARM_DESC(invert, "Invert input data on X and Y axis");
30 static DEFINE_MUTEX(ams_input_mutex);
32 static void ams_idev_poll(struct input_polled_dev *dev)
34 struct input_dev *idev = dev->input;
35 s8 x, y, z;
37 mutex_lock(&ams_info.lock);
39 ams_sensors(&x, &y, &z);
41 x -= ams_info.xcalib;
42 y -= ams_info.ycalib;
43 z -= ams_info.zcalib;
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);
49 input_sync(idev);
51 mutex_unlock(&ams_info.lock);
54 /* Call with ams_info.lock held! */
55 static int ams_input_enable(void)
57 struct input_dev *input;
58 s8 x, y, z;
59 int error;
61 ams_sensors(&x, &y, &z);
62 ams_info.xcalib = x;
63 ams_info.ycalib = y;
64 ams_info.zcalib = z;
66 ams_info.idev = input_allocate_polled_device();
67 if (!ams_info.idev)
68 return -ENOMEM;
70 ams_info.idev->poll = ams_idev_poll;
71 ams_info.idev->poll_interval = 25;
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;
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);
83 set_bit(EV_ABS, input->evbit);
84 set_bit(EV_KEY, input->evbit);
85 set_bit(BTN_TOUCH, input->keybit);
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;
94 joystick = 1;
96 return 0;
99 static void ams_input_disable(void)
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;
107 joystick = 0;
110 static ssize_t ams_input_show_joystick(struct device *dev,
111 struct device_attribute *attr, char *buf)
113 return sprintf(buf, "%d\n", joystick);
116 static ssize_t ams_input_store_joystick(struct device *dev,
117 struct device_attribute *attr, const char *buf, size_t count)
119 unsigned long enable;
120 int error = 0;
122 if (strict_strtoul(buf, 0, &enable) || enable > 1)
123 return -EINVAL;
125 mutex_lock(&ams_input_mutex);
127 if (enable != joystick) {
128 if (enable)
129 error = ams_input_enable();
130 else
131 ams_input_disable();
134 mutex_unlock(&ams_input_mutex);
136 return error ? error : count;
139 static DEVICE_ATTR(joystick, S_IRUGO | S_IWUSR,
140 ams_input_show_joystick, ams_input_store_joystick);
142 int ams_input_init(void)
144 if (joystick)
145 ams_input_enable();
147 return device_create_file(&ams_info.of_dev->dev, &dev_attr_joystick);
150 void ams_input_exit(void)
152 device_remove_file(&ams_info.of_dev->dev, &dev_attr_joystick);
154 mutex_lock(&ams_input_mutex);
155 ams_input_disable();
156 mutex_unlock(&ams_input_mutex);