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 bool joystick; 23 module_param(joystick, bool, S_IRUGO); 24 MODULE_PARM_DESC(joystick, "Enable the input class device on module load"); 25 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"); 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 = true; 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 = false; 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 int ret; 122 123 ret = kstrtoul(buf, 0, &enable); 124 if (ret) 125 return ret; 126 if (enable > 1) 127 return -EINVAL; 128 129 mutex_lock(&ams_input_mutex); 130 131 if (enable != joystick) { 132 if (enable) 133 error = ams_input_enable(); 134 else 135 ams_input_disable(); 136 } 137 138 mutex_unlock(&ams_input_mutex); 139 140 return error ? error : count; 141 } 142 143 static DEVICE_ATTR(joystick, S_IRUGO | S_IWUSR, 144 ams_input_show_joystick, ams_input_store_joystick); 145 146 int ams_input_init(void) 147 { 148 if (joystick) 149 ams_input_enable(); 150 151 return device_create_file(&ams_info.of_dev->dev, &dev_attr_joystick); 152 } 153 154 void ams_input_exit(void) 155 { 156 device_remove_file(&ams_info.of_dev->dev, &dev_attr_joystick); 157 158 mutex_lock(&ams_input_mutex); 159 ams_input_disable(); 160 mutex_unlock(&ams_input_mutex); 161 } 162