1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Apple Motion Sensor driver (joystick emulation)
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2005 Stelian Pop (stelian@popies.net)
6*4882a593Smuzhiyun * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/module.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <linux/types.h>
12*4882a593Smuzhiyun #include <linux/errno.h>
13*4882a593Smuzhiyun #include <linux/init.h>
14*4882a593Smuzhiyun #include <linux/delay.h>
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #include "ams.h"
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun static bool joystick;
19*4882a593Smuzhiyun module_param(joystick, bool, S_IRUGO);
20*4882a593Smuzhiyun MODULE_PARM_DESC(joystick, "Enable the input class device on module load");
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun static bool invert;
23*4882a593Smuzhiyun module_param(invert, bool, S_IWUSR | S_IRUGO);
24*4882a593Smuzhiyun MODULE_PARM_DESC(invert, "Invert input data on X and Y axis");
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun static DEFINE_MUTEX(ams_input_mutex);
27*4882a593Smuzhiyun
ams_idev_poll(struct input_dev * idev)28*4882a593Smuzhiyun static void ams_idev_poll(struct input_dev *idev)
29*4882a593Smuzhiyun {
30*4882a593Smuzhiyun s8 x, y, z;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun mutex_lock(&ams_info.lock);
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun ams_sensors(&x, &y, &z);
35*4882a593Smuzhiyun
36*4882a593Smuzhiyun x -= ams_info.xcalib;
37*4882a593Smuzhiyun y -= ams_info.ycalib;
38*4882a593Smuzhiyun z -= ams_info.zcalib;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun input_report_abs(idev, ABS_X, invert ? -x : x);
41*4882a593Smuzhiyun input_report_abs(idev, ABS_Y, invert ? -y : y);
42*4882a593Smuzhiyun input_report_abs(idev, ABS_Z, z);
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun input_sync(idev);
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun mutex_unlock(&ams_info.lock);
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun /* Call with ams_info.lock held! */
ams_input_enable(void)50*4882a593Smuzhiyun static int ams_input_enable(void)
51*4882a593Smuzhiyun {
52*4882a593Smuzhiyun struct input_dev *input;
53*4882a593Smuzhiyun s8 x, y, z;
54*4882a593Smuzhiyun int error;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun ams_sensors(&x, &y, &z);
57*4882a593Smuzhiyun ams_info.xcalib = x;
58*4882a593Smuzhiyun ams_info.ycalib = y;
59*4882a593Smuzhiyun ams_info.zcalib = z;
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun input = input_allocate_device();
62*4882a593Smuzhiyun if (!input)
63*4882a593Smuzhiyun return -ENOMEM;
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun input->name = "Apple Motion Sensor";
66*4882a593Smuzhiyun input->id.bustype = ams_info.bustype;
67*4882a593Smuzhiyun input->id.vendor = 0;
68*4882a593Smuzhiyun input->dev.parent = &ams_info.of_dev->dev;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun input_set_abs_params(input, ABS_X, -50, 50, 3, 0);
71*4882a593Smuzhiyun input_set_abs_params(input, ABS_Y, -50, 50, 3, 0);
72*4882a593Smuzhiyun input_set_abs_params(input, ABS_Z, -50, 50, 3, 0);
73*4882a593Smuzhiyun input_set_capability(input, EV_KEY, BTN_TOUCH);
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun error = input_setup_polling(input, ams_idev_poll);
76*4882a593Smuzhiyun if (error)
77*4882a593Smuzhiyun goto err_free_input;
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun input_set_poll_interval(input, 25);
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun error = input_register_device(input);
82*4882a593Smuzhiyun if (error)
83*4882a593Smuzhiyun goto err_free_input;
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun ams_info.idev = input;
86*4882a593Smuzhiyun joystick = true;
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun return 0;
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun err_free_input:
91*4882a593Smuzhiyun input_free_device(input);
92*4882a593Smuzhiyun return error;
93*4882a593Smuzhiyun }
94*4882a593Smuzhiyun
ams_input_disable(void)95*4882a593Smuzhiyun static void ams_input_disable(void)
96*4882a593Smuzhiyun {
97*4882a593Smuzhiyun if (ams_info.idev) {
98*4882a593Smuzhiyun input_unregister_device(ams_info.idev);
99*4882a593Smuzhiyun ams_info.idev = NULL;
100*4882a593Smuzhiyun }
101*4882a593Smuzhiyun
102*4882a593Smuzhiyun joystick = false;
103*4882a593Smuzhiyun }
104*4882a593Smuzhiyun
ams_input_show_joystick(struct device * dev,struct device_attribute * attr,char * buf)105*4882a593Smuzhiyun static ssize_t ams_input_show_joystick(struct device *dev,
106*4882a593Smuzhiyun struct device_attribute *attr, char *buf)
107*4882a593Smuzhiyun {
108*4882a593Smuzhiyun return sprintf(buf, "%d\n", joystick);
109*4882a593Smuzhiyun }
110*4882a593Smuzhiyun
ams_input_store_joystick(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)111*4882a593Smuzhiyun static ssize_t ams_input_store_joystick(struct device *dev,
112*4882a593Smuzhiyun struct device_attribute *attr, const char *buf, size_t count)
113*4882a593Smuzhiyun {
114*4882a593Smuzhiyun unsigned long enable;
115*4882a593Smuzhiyun int error = 0;
116*4882a593Smuzhiyun int ret;
117*4882a593Smuzhiyun
118*4882a593Smuzhiyun ret = kstrtoul(buf, 0, &enable);
119*4882a593Smuzhiyun if (ret)
120*4882a593Smuzhiyun return ret;
121*4882a593Smuzhiyun if (enable > 1)
122*4882a593Smuzhiyun return -EINVAL;
123*4882a593Smuzhiyun
124*4882a593Smuzhiyun mutex_lock(&ams_input_mutex);
125*4882a593Smuzhiyun
126*4882a593Smuzhiyun if (enable != joystick) {
127*4882a593Smuzhiyun if (enable)
128*4882a593Smuzhiyun error = ams_input_enable();
129*4882a593Smuzhiyun else
130*4882a593Smuzhiyun ams_input_disable();
131*4882a593Smuzhiyun }
132*4882a593Smuzhiyun
133*4882a593Smuzhiyun mutex_unlock(&ams_input_mutex);
134*4882a593Smuzhiyun
135*4882a593Smuzhiyun return error ? error : count;
136*4882a593Smuzhiyun }
137*4882a593Smuzhiyun
138*4882a593Smuzhiyun static DEVICE_ATTR(joystick, S_IRUGO | S_IWUSR,
139*4882a593Smuzhiyun ams_input_show_joystick, ams_input_store_joystick);
140*4882a593Smuzhiyun
ams_input_init(void)141*4882a593Smuzhiyun int ams_input_init(void)
142*4882a593Smuzhiyun {
143*4882a593Smuzhiyun if (joystick)
144*4882a593Smuzhiyun ams_input_enable();
145*4882a593Smuzhiyun
146*4882a593Smuzhiyun return device_create_file(&ams_info.of_dev->dev, &dev_attr_joystick);
147*4882a593Smuzhiyun }
148*4882a593Smuzhiyun
ams_input_exit(void)149*4882a593Smuzhiyun void ams_input_exit(void)
150*4882a593Smuzhiyun {
151*4882a593Smuzhiyun device_remove_file(&ams_info.of_dev->dev, &dev_attr_joystick);
152*4882a593Smuzhiyun
153*4882a593Smuzhiyun mutex_lock(&ams_input_mutex);
154*4882a593Smuzhiyun ams_input_disable();
155*4882a593Smuzhiyun mutex_unlock(&ams_input_mutex);
156*4882a593Smuzhiyun }
157