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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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ee4cd32ee8
Use a separate mutex to serialize input device creation/removal, otheriwse we deadlock if we try to remove input device while it is being polled. Also do not take ams_info.lock when it is not needed. Signed-off-by: Dmitry Torokhov <dtor@mail.ru> Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Jean Delvare <khali@linux-fr.org>
158 lines
3.5 KiB
C
158 lines
3.5 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 unsigned int 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 unsigned int 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 = 1;
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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 = 0;
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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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if (strict_strtoul(buf, 0, &enable) || 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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