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156 lines
3.1 KiB
156 lines
3.1 KiB
// 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 ([email protected]) |
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* Copyright (C) 2006 Michael Hanselmann ([email protected]) |
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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_dev *idev) |
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{ |
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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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input = input_allocate_device(); |
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if (!input) |
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return -ENOMEM; |
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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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input_set_capability(input, EV_KEY, BTN_TOUCH); |
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error = input_setup_polling(input, ams_idev_poll); |
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if (error) |
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goto err_free_input; |
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input_set_poll_interval(input, 25); |
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error = input_register_device(input); |
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if (error) |
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goto err_free_input; |
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ams_info.idev = input; |
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joystick = true; |
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return 0; |
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err_free_input: |
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input_free_device(input); |
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return error; |
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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_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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