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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/macintosh/ams/ams-input.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/macintosh/ams/ams-input.c')
-rw-r--r-- | drivers/macintosh/ams/ams-input.c | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/drivers/macintosh/ams/ams-input.c b/drivers/macintosh/ams/ams-input.c new file mode 100644 index 000000000..0da493d44 --- /dev/null +++ b/drivers/macintosh/ams/ams-input.c @@ -0,0 +1,156 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Apple Motion Sensor driver (joystick emulation) + * + * Copyright (C) 2005 Stelian Pop (stelian@popies.net) + * Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch) + */ + +#include <linux/module.h> + +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/delay.h> + +#include "ams.h" + +static bool joystick; +module_param(joystick, bool, S_IRUGO); +MODULE_PARM_DESC(joystick, "Enable the input class device on module load"); + +static bool invert; +module_param(invert, bool, S_IWUSR | S_IRUGO); +MODULE_PARM_DESC(invert, "Invert input data on X and Y axis"); + +static DEFINE_MUTEX(ams_input_mutex); + +static void ams_idev_poll(struct input_dev *idev) +{ + s8 x, y, z; + + mutex_lock(&ams_info.lock); + + ams_sensors(&x, &y, &z); + + x -= ams_info.xcalib; + y -= ams_info.ycalib; + z -= ams_info.zcalib; + + input_report_abs(idev, ABS_X, invert ? -x : x); + input_report_abs(idev, ABS_Y, invert ? -y : y); + input_report_abs(idev, ABS_Z, z); + + input_sync(idev); + + mutex_unlock(&ams_info.lock); +} + +/* Call with ams_info.lock held! */ +static int ams_input_enable(void) +{ + struct input_dev *input; + s8 x, y, z; + int error; + + ams_sensors(&x, &y, &z); + ams_info.xcalib = x; + ams_info.ycalib = y; + ams_info.zcalib = z; + + input = input_allocate_device(); + if (!input) + return -ENOMEM; + + input->name = "Apple Motion Sensor"; + input->id.bustype = ams_info.bustype; + input->id.vendor = 0; + input->dev.parent = &ams_info.of_dev->dev; + + input_set_abs_params(input, ABS_X, -50, 50, 3, 0); + input_set_abs_params(input, ABS_Y, -50, 50, 3, 0); + input_set_abs_params(input, ABS_Z, -50, 50, 3, 0); + input_set_capability(input, EV_KEY, BTN_TOUCH); + + error = input_setup_polling(input, ams_idev_poll); + if (error) + goto err_free_input; + + input_set_poll_interval(input, 25); + + error = input_register_device(input); + if (error) + goto err_free_input; + + ams_info.idev = input; + joystick = true; + + return 0; + +err_free_input: + input_free_device(input); + return error; +} + +static void ams_input_disable(void) +{ + if (ams_info.idev) { + input_unregister_device(ams_info.idev); + ams_info.idev = NULL; + } + + joystick = false; +} + +static ssize_t ams_input_show_joystick(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%d\n", joystick); +} + +static ssize_t ams_input_store_joystick(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + unsigned long enable; + int error = 0; + int ret; + + ret = kstrtoul(buf, 0, &enable); + if (ret) + return ret; + if (enable > 1) + return -EINVAL; + + mutex_lock(&ams_input_mutex); + + if (enable != joystick) { + if (enable) + error = ams_input_enable(); + else + ams_input_disable(); + } + + mutex_unlock(&ams_input_mutex); + + return error ? error : count; +} + +static DEVICE_ATTR(joystick, S_IRUGO | S_IWUSR, + ams_input_show_joystick, ams_input_store_joystick); + +int ams_input_init(void) +{ + if (joystick) + ams_input_enable(); + + return device_create_file(&ams_info.of_dev->dev, &dev_attr_joystick); +} + +void ams_input_exit(void) +{ + device_remove_file(&ams_info.of_dev->dev, &dev_attr_joystick); + + mutex_lock(&ams_input_mutex); + ams_input_disable(); + mutex_unlock(&ams_input_mutex); +} |