blob: 0da493d449b2fe4894ba0ac7be1d2b92b4637e5c [file] [log] [blame]
Thomas Gleixner2874c5f2019-05-27 08:55:01 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Stelian Popdcb69dd2006-12-12 18:18:30 +01002/*
3 * Apple Motion Sensor driver (joystick emulation)
4 *
5 * Copyright (C) 2005 Stelian Pop (stelian@popies.net)
6 * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
Stelian Popdcb69dd2006-12-12 18:18:30 +01007 */
8
9#include <linux/module.h>
10
11#include <linux/types.h>
12#include <linux/errno.h>
13#include <linux/init.h>
14#include <linux/delay.h>
15
16#include "ams.h"
17
Rusty Russell90ab5ee2012-01-13 09:32:20 +103018static bool joystick;
Dmitry Torokhov0a020022008-10-17 17:51:12 +020019module_param(joystick, bool, S_IRUGO);
Stelian Popdcb69dd2006-12-12 18:18:30 +010020MODULE_PARM_DESC(joystick, "Enable the input class device on module load");
21
Rusty Russell90ab5ee2012-01-13 09:32:20 +103022static bool invert;
Dmitry Torokhov0a020022008-10-17 17:51:12 +020023module_param(invert, bool, S_IWUSR | S_IRUGO);
Stelian Popdcb69dd2006-12-12 18:18:30 +010024MODULE_PARM_DESC(invert, "Invert input data on X and Y axis");
25
Dmitry Torokhovee4cd322008-10-17 17:51:12 +020026static DEFINE_MUTEX(ams_input_mutex);
27
Dmitry Torokhov0c444d92019-10-02 14:48:54 -070028static void ams_idev_poll(struct input_dev *idev)
Stelian Popdcb69dd2006-12-12 18:18:30 +010029{
30 s8 x, y, z;
31
Dmitry Torokhov3fdbc342007-09-26 00:01:41 -040032 mutex_lock(&ams_info.lock);
Stelian Popdcb69dd2006-12-12 18:18:30 +010033
Dmitry Torokhov3fdbc342007-09-26 00:01:41 -040034 ams_sensors(&x, &y, &z);
Stelian Popdcb69dd2006-12-12 18:18:30 +010035
Dmitry Torokhov3fdbc342007-09-26 00:01:41 -040036 x -= ams_info.xcalib;
37 y -= ams_info.ycalib;
38 z -= ams_info.zcalib;
Stelian Popdcb69dd2006-12-12 18:18:30 +010039
Dmitry Torokhov3fdbc342007-09-26 00:01:41 -040040 input_report_abs(idev, ABS_X, invert ? -x : x);
41 input_report_abs(idev, ABS_Y, invert ? -y : y);
42 input_report_abs(idev, ABS_Z, z);
Stelian Popdcb69dd2006-12-12 18:18:30 +010043
Dmitry Torokhov3fdbc342007-09-26 00:01:41 -040044 input_sync(idev);
Stelian Popdcb69dd2006-12-12 18:18:30 +010045
Dmitry Torokhov3fdbc342007-09-26 00:01:41 -040046 mutex_unlock(&ams_info.lock);
Stelian Popdcb69dd2006-12-12 18:18:30 +010047}
48
49/* Call with ams_info.lock held! */
Dmitry Torokhovee4cd322008-10-17 17:51:12 +020050static int ams_input_enable(void)
Stelian Popdcb69dd2006-12-12 18:18:30 +010051{
Dmitry Torokhov3fdbc342007-09-26 00:01:41 -040052 struct input_dev *input;
Stelian Popdcb69dd2006-12-12 18:18:30 +010053 s8 x, y, z;
Dmitry Torokhovee4cd322008-10-17 17:51:12 +020054 int error;
Stelian Popdcb69dd2006-12-12 18:18:30 +010055
56 ams_sensors(&x, &y, &z);
57 ams_info.xcalib = x;
58 ams_info.ycalib = y;
59 ams_info.zcalib = z;
60
Dmitry Torokhov0c444d92019-10-02 14:48:54 -070061 input = input_allocate_device();
62 if (!input)
Dmitry Torokhovee4cd322008-10-17 17:51:12 +020063 return -ENOMEM;
Stelian Popdcb69dd2006-12-12 18:18:30 +010064
Dmitry Torokhov3fdbc342007-09-26 00:01:41 -040065 input->name = "Apple Motion Sensor";
66 input->id.bustype = ams_info.bustype;
67 input->id.vendor = 0;
68 input->dev.parent = &ams_info.of_dev->dev;
Stelian Popdcb69dd2006-12-12 18:18:30 +010069
Dmitry Torokhov3fdbc342007-09-26 00:01:41 -040070 input_set_abs_params(input, ABS_X, -50, 50, 3, 0);
71 input_set_abs_params(input, ABS_Y, -50, 50, 3, 0);
72 input_set_abs_params(input, ABS_Z, -50, 50, 3, 0);
Dmitry Torokhov0c444d92019-10-02 14:48:54 -070073 input_set_capability(input, EV_KEY, BTN_TOUCH);
Stelian Popdcb69dd2006-12-12 18:18:30 +010074
Dmitry Torokhov0c444d92019-10-02 14:48:54 -070075 error = input_setup_polling(input, ams_idev_poll);
76 if (error)
77 goto err_free_input;
Dmitry Torokhov3fdbc342007-09-26 00:01:41 -040078
Dmitry Torokhov0c444d92019-10-02 14:48:54 -070079 input_set_poll_interval(input, 25);
Dmitry Torokhovee4cd322008-10-17 17:51:12 +020080
Dmitry Torokhov0c444d92019-10-02 14:48:54 -070081 error = input_register_device(input);
82 if (error)
83 goto err_free_input;
84
85 ams_info.idev = input;
Gustavo A. R. Silva516c32f2018-01-23 19:48:46 -060086 joystick = true;
Dmitry Torokhovee4cd322008-10-17 17:51:12 +020087
88 return 0;
Dmitry Torokhov0c444d92019-10-02 14:48:54 -070089
90err_free_input:
91 input_free_device(input);
92 return error;
Stelian Popdcb69dd2006-12-12 18:18:30 +010093}
94
Stelian Popdcb69dd2006-12-12 18:18:30 +010095static void ams_input_disable(void)
96{
97 if (ams_info.idev) {
Dmitry Torokhov0c444d92019-10-02 14:48:54 -070098 input_unregister_device(ams_info.idev);
Stelian Popdcb69dd2006-12-12 18:18:30 +010099 ams_info.idev = NULL;
100 }
Dmitry Torokhovee4cd322008-10-17 17:51:12 +0200101
Gustavo A. R. Silva516c32f2018-01-23 19:48:46 -0600102 joystick = false;
Stelian Popdcb69dd2006-12-12 18:18:30 +0100103}
104
105static ssize_t ams_input_show_joystick(struct device *dev,
106 struct device_attribute *attr, char *buf)
107{
108 return sprintf(buf, "%d\n", joystick);
109}
110
111static ssize_t ams_input_store_joystick(struct device *dev,
112 struct device_attribute *attr, const char *buf, size_t count)
113{
Dmitry Torokhovee4cd322008-10-17 17:51:12 +0200114 unsigned long enable;
115 int error = 0;
Jingoo Han7033b642013-07-19 16:16:56 +0900116 int ret;
Dmitry Torokhovee4cd322008-10-17 17:51:12 +0200117
Jingoo Han7033b642013-07-19 16:16:56 +0900118 ret = kstrtoul(buf, 0, &enable);
119 if (ret)
120 return ret;
121 if (enable > 1)
Stelian Popdcb69dd2006-12-12 18:18:30 +0100122 return -EINVAL;
123
Dmitry Torokhovee4cd322008-10-17 17:51:12 +0200124 mutex_lock(&ams_input_mutex);
Stelian Popdcb69dd2006-12-12 18:18:30 +0100125
Dmitry Torokhovee4cd322008-10-17 17:51:12 +0200126 if (enable != joystick) {
127 if (enable)
128 error = ams_input_enable();
129 else
130 ams_input_disable();
131 }
Stelian Popdcb69dd2006-12-12 18:18:30 +0100132
Dmitry Torokhovee4cd322008-10-17 17:51:12 +0200133 mutex_unlock(&ams_input_mutex);
Stelian Popdcb69dd2006-12-12 18:18:30 +0100134
Dmitry Torokhovee4cd322008-10-17 17:51:12 +0200135 return error ? error : count;
Stelian Popdcb69dd2006-12-12 18:18:30 +0100136}
137
138static DEVICE_ATTR(joystick, S_IRUGO | S_IWUSR,
139 ams_input_show_joystick, ams_input_store_joystick);
140
Stelian Popdcb69dd2006-12-12 18:18:30 +0100141int ams_input_init(void)
142{
Dmitry Torokhovee4cd322008-10-17 17:51:12 +0200143 if (joystick)
Stelian Popdcb69dd2006-12-12 18:18:30 +0100144 ams_input_enable();
Dmitry Torokhovee4cd322008-10-17 17:51:12 +0200145
146 return device_create_file(&ams_info.of_dev->dev, &dev_attr_joystick);
Stelian Popdcb69dd2006-12-12 18:18:30 +0100147}
148
Al Virod7bde2f2007-02-09 16:38:50 +0000149void ams_input_exit(void)
Stelian Popdcb69dd2006-12-12 18:18:30 +0100150{
Stelian Popdcb69dd2006-12-12 18:18:30 +0100151 device_remove_file(&ams_info.of_dev->dev, &dev_attr_joystick);
Dmitry Torokhovee4cd322008-10-17 17:51:12 +0200152
153 mutex_lock(&ams_input_mutex);
154 ams_input_disable();
155 mutex_unlock(&ams_input_mutex);
Stelian Popdcb69dd2006-12-12 18:18:30 +0100156}