2874c5fd28
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
158 lines
3.3 KiB
C
158 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Apple Motion Sensor driver (joystick emulation)
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*
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* Copyright (C) 2005 Stelian Pop (stelian@popies.net)
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* Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include "ams.h"
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static bool joystick;
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module_param(joystick, bool, S_IRUGO);
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MODULE_PARM_DESC(joystick, "Enable the input class device on module load");
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static bool invert;
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module_param(invert, bool, S_IWUSR | S_IRUGO);
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MODULE_PARM_DESC(invert, "Invert input data on X and Y axis");
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static DEFINE_MUTEX(ams_input_mutex);
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static void ams_idev_poll(struct input_polled_dev *dev)
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{
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struct input_dev *idev = dev->input;
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s8 x, y, z;
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mutex_lock(&ams_info.lock);
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ams_sensors(&x, &y, &z);
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x -= ams_info.xcalib;
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y -= ams_info.ycalib;
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z -= ams_info.zcalib;
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input_report_abs(idev, ABS_X, invert ? -x : x);
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input_report_abs(idev, ABS_Y, invert ? -y : y);
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input_report_abs(idev, ABS_Z, z);
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input_sync(idev);
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mutex_unlock(&ams_info.lock);
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}
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/* Call with ams_info.lock held! */
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static int ams_input_enable(void)
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{
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struct input_dev *input;
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s8 x, y, z;
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int error;
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ams_sensors(&x, &y, &z);
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ams_info.xcalib = x;
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ams_info.ycalib = y;
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ams_info.zcalib = z;
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ams_info.idev = input_allocate_polled_device();
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if (!ams_info.idev)
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return -ENOMEM;
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ams_info.idev->poll = ams_idev_poll;
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ams_info.idev->poll_interval = 25;
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input = ams_info.idev->input;
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input->name = "Apple Motion Sensor";
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input->id.bustype = ams_info.bustype;
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input->id.vendor = 0;
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input->dev.parent = &ams_info.of_dev->dev;
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input_set_abs_params(input, ABS_X, -50, 50, 3, 0);
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input_set_abs_params(input, ABS_Y, -50, 50, 3, 0);
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input_set_abs_params(input, ABS_Z, -50, 50, 3, 0);
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set_bit(EV_ABS, input->evbit);
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set_bit(EV_KEY, input->evbit);
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set_bit(BTN_TOUCH, input->keybit);
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error = input_register_polled_device(ams_info.idev);
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if (error) {
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input_free_polled_device(ams_info.idev);
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ams_info.idev = NULL;
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return error;
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}
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joystick = true;
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return 0;
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}
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static void ams_input_disable(void)
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{
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if (ams_info.idev) {
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input_unregister_polled_device(ams_info.idev);
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input_free_polled_device(ams_info.idev);
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ams_info.idev = NULL;
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}
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joystick = false;
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}
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static ssize_t ams_input_show_joystick(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "%d\n", joystick);
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}
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static ssize_t ams_input_store_joystick(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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unsigned long enable;
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int error = 0;
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int ret;
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ret = kstrtoul(buf, 0, &enable);
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if (ret)
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return ret;
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if (enable > 1)
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return -EINVAL;
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mutex_lock(&ams_input_mutex);
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if (enable != joystick) {
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if (enable)
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error = ams_input_enable();
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else
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ams_input_disable();
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}
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mutex_unlock(&ams_input_mutex);
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return error ? error : count;
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}
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static DEVICE_ATTR(joystick, S_IRUGO | S_IWUSR,
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ams_input_show_joystick, ams_input_store_joystick);
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int ams_input_init(void)
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{
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if (joystick)
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ams_input_enable();
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return device_create_file(&ams_info.of_dev->dev, &dev_attr_joystick);
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}
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void ams_input_exit(void)
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{
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device_remove_file(&ams_info.of_dev->dev, &dev_attr_joystick);
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mutex_lock(&ams_input_mutex);
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ams_input_disable();
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mutex_unlock(&ams_input_mutex);
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}
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