// SPDX-License-Identifier: GPL-2.0-only
/*
* Event char devices, giving access to raw input device events.
*
* Copyright (c) 1999-2002 Vojtech Pavlik
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#define EVDEV_MINOR_BASE 64
#define EVDEV_MINORS 32
#define EVDEV_MIN_BUFFER_SIZE 64U
#define EVDEV_BUF_PACKETS 8
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input/mt.h>
#include <linux/major.h>
#include <linux/device.h>
#include <linux/cdev.h>
#include "input-compat.h"
struct evdev {
int open;
struct input_handle handle;
struct evdev_client __rcu *grab;
struct list_head client_list;
spinlock_t client_lock; /* protects client_list */
struct mutex mutex;
struct device dev;
struct cdev cdev;
bool exist;
};
struct evdev_client {
unsigned int head;
unsigned int tail;
unsigned int packet_head; /* [future] position of the first element of next packet */
spinlock_t buffer_lock; /* protects access to buffer, head and tail */
wait_queue_head_t wait;
struct fasync_struct *fasync;
struct evdev *evdev;
struct list_head node;
enum input_clock_type clk_type;
bool revoked;
unsigned long *evmasks[EV_CNT];
unsigned int bufsize;
struct input_event buffer[] __counted_by(bufsize);
};
static size_t evdev_get_mask_cnt(unsigned int type)
{
static const size_t counts[EV_CNT] = {
/* EV_SYN==0 is EV_CNT, _not_ SYN_CNT, see EVIOCGBIT */
[EV_SYN] = EV_CNT,
[EV_KEY] = KEY_CNT,
[EV_REL] = REL_CNT,
[EV_ABS] = 