Stelian Pop | dcb69dd | 2006-12-12 18:18:30 +0100 | [diff] [blame] | 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; |
Dmitry Torokhov | c5ddb54 | 2007-05-10 03:15:47 -0700 | [diff] [blame] | 90 | ams_info.idev->dev.parent = &ams_info.of_dev->dev; |
Stelian Pop | dcb69dd | 2006-12-12 18:18:30 +0100 | [diff] [blame] | 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! */ |
Al Viro | d7bde2f | 2007-02-09 16:38:50 +0000 | [diff] [blame] | 156 | void ams_input_exit(void) |
Stelian Pop | dcb69dd | 2006-12-12 18:18:30 +0100 | [diff] [blame] | 157 | { |
| 158 | ams_input_disable(); |
| 159 | device_remove_file(&ams_info.of_dev->dev, &dev_attr_joystick); |
| 160 | } |