// SPDX-License-Identifier: GPL-2.0-or-later /* * User level driver support for input subsystem * * Heavily based on evdev.c by Vojtech Pavlik * * Author: Aristeu Sergio Rozanski Filho <[email protected]> * * Changes/Revisions: * 0.4 01/09/2014 (Benjamin Tissoires <[email protected]>) * - add UI_GET_SYSNAME ioctl * 0.3 09/04/2006 (Anssi Hannula <[email protected]>) * - updated ff support for the changes in kernel interface * - added MODULE_VERSION * 0.2 16/10/2004 (Micah Dowty <[email protected]>) * - added force feedback support * - added UI_SET_PHYS * 0.1 20/06/2002 * - first public version */ #include <uapi/linux/uinput.h> #include <linux/poll.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/module.h> #include <linux/init.h> #include <linux/fs.h> #include <linux/miscdevice.h> #include <linux/overflow.h> #include <linux/input/mt.h> #include "../input-compat.h" #define UINPUT_NAME … #define UINPUT_BUFFER_SIZE … #define UINPUT_NUM_REQUESTS … #define UINPUT_TIMESTAMP_ALLOWED_OFFSET_SECS … enum uinput_state { … }; struct uinput_request { … }; struct uinput_device { … }; static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value) { … } /* Atomically allocate an ID for the given request. Returns 0 on success. */ static bool uinput_request_alloc_id(struct uinput_device *udev, struct uinput_request *request) { … } static struct uinput_request *uinput_request_find(struct uinput_device *udev, unsigned int id) { … } static int uinput_request_reserve_slot(struct uinput_device *udev, struct uinput_request *request) { … } static void uinput_request_release_slot(struct uinput_device *udev, unsigned int id) { … } static int uinput_request_send(struct uinput_device *udev, struct uinput_request *request) { … } static int uinput_request_submit(struct uinput_device *udev, struct uinput_request *request) { … } /* * Fail all outstanding requests so handlers don't wait for the userspace * to finish processing them. */ static void uinput_flush_requests(struct uinput_device *udev) { … } static void uinput_dev_set_gain(struct input_dev *dev, u16 gain) { … } static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude) { … } static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value) { … } static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect, struct ff_effect *old) { … } static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id) { … } static int uinput_dev_flush(struct input_dev *dev, struct file *file) { … } static void uinput_destroy_device(struct uinput_device *udev) { … } static int uinput_create_device(struct uinput_device *udev) { … } static int uinput_open(struct inode *inode, struct file *file) { … } static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code, const struct input_absinfo *abs) { … } static int uinput_validate_absbits(struct input_dev *dev) { … } static int uinput_dev_setup(struct uinput_device *udev, struct uinput_setup __user *arg) { … } static int uinput_abs_setup(struct uinput_device *udev, struct uinput_setup __user *arg, size_t size) { … } /* legacy setup via write() */ static int uinput_setup_device_legacy(struct uinput_device *udev, const char __user *buffer, size_t count) { … } /* * Returns true if the given timestamp is valid (i.e., if all the following * conditions are satisfied), false otherwise. * 1) given timestamp is positive * 2) it's within the allowed offset before the current time * 3) it's not in the future */ static bool is_valid_timestamp(const ktime_t timestamp) { … } static ssize_t uinput_inject_events(struct uinput_device *udev, const char __user *buffer, size_t count) { … } static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos) { … } static bool uinput_fetch_next_event(struct uinput_device *udev, struct input_event *event) { … } static ssize_t uinput_events_to_user(struct uinput_device *udev, char __user *buffer, size_t count) { … } static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos) { … } static __poll_t uinput_poll(struct file *file, poll_table *wait) { … } static int uinput_release(struct inode *inode, struct file *file) { … } #ifdef CONFIG_COMPAT struct uinput_ff_upload_compat { … }; static int uinput_ff_upload_to_user(char __user *buffer, const struct uinput_ff_upload *ff_up) { … } static int uinput_ff_upload_from_user(const char __user *buffer, struct uinput_ff_upload *ff_up) { … } #else static int uinput_ff_upload_to_user(char __user *buffer, const struct uinput_ff_upload *ff_up) { if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload))) return -EFAULT; return 0; } static int uinput_ff_upload_from_user(const char __user *buffer, struct uinput_ff_upload *ff_up) { if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload))) return -EFAULT; return 0; } #endif #define uinput_set_bit(_arg, _bit, _max) … static int uinput_str_to_user(void __user *dest, const char *str, unsigned int maxlen) { … } static long uinput_ioctl_handler(struct file *file, unsigned int cmd, unsigned long arg, void __user *p) { … } static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { … } #ifdef CONFIG_COMPAT /* * These IOCTLs change their size and thus their numbers between * 32 and 64 bits. */ #define UI_SET_PHYS_COMPAT … #define UI_BEGIN_FF_UPLOAD_COMPAT … #define UI_END_FF_UPLOAD_COMPAT … static long uinput_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { … } #endif static const struct file_operations uinput_fops = …; static struct miscdevice uinput_misc = …; module_misc_device(…); MODULE_ALIAS_MISCDEV(…); MODULE_ALIAS(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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