mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
1057 lines
24 KiB
C
1057 lines
24 KiB
C
/*
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* Event char devices, giving access to raw input device events.
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*
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* Copyright (c) 1999-2002 Vojtech Pavlik
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#define EVDEV_MINOR_BASE 64
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#define EVDEV_MINORS 32
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#define EVDEV_MIN_BUFFER_SIZE 64U
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#define EVDEV_BUF_PACKETS 8
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/input/mt.h>
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#include <linux/major.h>
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#include <linux/device.h>
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#include "input-compat.h"
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struct evdev {
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int open;
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int minor;
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struct input_handle handle;
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wait_queue_head_t wait;
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struct evdev_client __rcu *grab;
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struct list_head client_list;
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spinlock_t client_lock; /* protects client_list */
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struct mutex mutex;
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struct device dev;
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bool exist;
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};
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struct evdev_client {
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unsigned int head;
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unsigned int tail;
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unsigned int packet_head; /* [future] position of the first element of next packet */
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spinlock_t buffer_lock; /* protects access to buffer, head and tail */
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struct fasync_struct *fasync;
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struct evdev *evdev;
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struct list_head node;
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int clkid;
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unsigned int bufsize;
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struct input_event buffer[];
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};
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static struct evdev *evdev_table[EVDEV_MINORS];
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static DEFINE_MUTEX(evdev_table_mutex);
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static void evdev_pass_event(struct evdev_client *client,
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struct input_event *event,
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ktime_t mono, ktime_t real)
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{
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event->time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ?
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mono : real);
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/* Interrupts are disabled, just acquire the lock. */
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spin_lock(&client->buffer_lock);
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client->buffer[client->head++] = *event;
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client->head &= client->bufsize - 1;
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if (unlikely(client->head == client->tail)) {
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/*
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* This effectively "drops" all unconsumed events, leaving
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* EV_SYN/SYN_DROPPED plus the newest event in the queue.
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*/
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client->tail = (client->head - 2) & (client->bufsize - 1);
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client->buffer[client->tail].time = event->time;
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client->buffer[client->tail].type = EV_SYN;
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client->buffer[client->tail].code = SYN_DROPPED;
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client->buffer[client->tail].value = 0;
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client->packet_head = client->tail;
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}
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if (event->type == EV_SYN && event->code == SYN_REPORT) {
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client->packet_head = client->head;
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kill_fasync(&client->fasync, SIGIO, POLL_IN);
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}
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spin_unlock(&client->buffer_lock);
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}
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/*
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* Pass incoming event to all connected clients.
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*/
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static void evdev_event(struct input_handle *handle,
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unsigned int type, unsigned int code, int value)
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{
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struct evdev *evdev = handle->private;
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struct evdev_client *client;
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struct input_event event;
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ktime_t time_mono, time_real;
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time_mono = ktime_get();
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time_real = ktime_sub(time_mono, ktime_get_monotonic_offset());
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event.type = type;
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event.code = code;
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event.value = value;
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rcu_read_lock();
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client = rcu_dereference(evdev->grab);
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if (client)
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evdev_pass_event(client, &event, time_mono, time_real);
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else
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list_for_each_entry_rcu(client, &evdev->client_list, node)
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evdev_pass_event(client, &event, time_mono, time_real);
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rcu_read_unlock();
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if (type == EV_SYN && code == SYN_REPORT)
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wake_up_interruptible(&evdev->wait);
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}
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static int evdev_fasync(int fd, struct file *file, int on)
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{
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struct evdev_client *client = file->private_data;
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return fasync_helper(fd, file, on, &client->fasync);
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}
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static int evdev_flush(struct file *file, fl_owner_t id)
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{
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struct evdev_client *client = file->private_data;
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struct evdev *evdev = client->evdev;
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int retval;
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retval = mutex_lock_interruptible(&evdev->mutex);
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if (retval)
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return retval;
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if (!evdev->exist)
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retval = -ENODEV;
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else
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retval = input_flush_device(&evdev->handle, file);
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mutex_unlock(&evdev->mutex);
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return retval;
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}
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static void evdev_free(struct device *dev)
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{
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struct evdev *evdev = container_of(dev, struct evdev, dev);
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input_put_device(evdev->handle.dev);
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kfree(evdev);
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}
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/*
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* Grabs an event device (along with underlying input device).
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* This function is called with evdev->mutex taken.
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*/
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static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
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{
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int error;
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if (evdev->grab)
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return -EBUSY;
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error = input_grab_device(&evdev->handle);
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if (error)
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return error;
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rcu_assign_pointer(evdev->grab, client);
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return 0;
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}
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static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
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{
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if (evdev->grab != client)
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return -EINVAL;
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rcu_assign_pointer(evdev->grab, NULL);
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synchronize_rcu();
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input_release_device(&evdev->handle);
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return 0;
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}
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static void evdev_attach_client(struct evdev *evdev,
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struct evdev_client *client)
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{
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spin_lock(&evdev->client_lock);
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list_add_tail_rcu(&client->node, &evdev->client_list);
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spin_unlock(&evdev->client_lock);
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}
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static void evdev_detach_client(struct evdev *evdev,
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struct evdev_client *client)
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{
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spin_lock(&evdev->client_lock);
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list_del_rcu(&client->node);
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spin_unlock(&evdev->client_lock);
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synchronize_rcu();
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}
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static int evdev_open_device(struct evdev *evdev)
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{
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int retval;
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retval = mutex_lock_interruptible(&evdev->mutex);
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if (retval)
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return retval;
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if (!evdev->exist)
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retval = -ENODEV;
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else if (!evdev->open++) {
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retval = input_open_device(&evdev->handle);
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if (retval)
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evdev->open--;
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}
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mutex_unlock(&evdev->mutex);
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return retval;
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}
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static void evdev_close_device(struct evdev *evdev)
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{
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mutex_lock(&evdev->mutex);
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if (evdev->exist && !--evdev->open)
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input_close_device(&evdev->handle);
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mutex_unlock(&evdev->mutex);
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}
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/*
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* Wake up users waiting for IO so they can disconnect from
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* dead device.
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*/
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static void evdev_hangup(struct evdev *evdev)
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{
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struct evdev_client *client;
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spin_lock(&evdev->client_lock);
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list_for_each_entry(client, &evdev->client_list, node)
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kill_fasync(&client->fasync, SIGIO, POLL_HUP);
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spin_unlock(&evdev->client_lock);
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wake_up_interruptible(&evdev->wait);
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}
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static int evdev_release(struct inode *inode, struct file *file)
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{
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struct evdev_client *client = file->private_data;
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struct evdev *evdev = client->evdev;
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mutex_lock(&evdev->mutex);
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if (evdev->grab == client)
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evdev_ungrab(evdev, client);
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mutex_unlock(&evdev->mutex);
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evdev_detach_client(evdev, client);
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kfree(client);
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evdev_close_device(evdev);
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put_device(&evdev->dev);
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return 0;
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}
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static unsigned int evdev_compute_buffer_size(struct input_dev *dev)
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{
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unsigned int n_events =
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max(dev->hint_events_per_packet * EVDEV_BUF_PACKETS,
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EVDEV_MIN_BUFFER_SIZE);
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return roundup_pow_of_two(n_events);
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}
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static int evdev_open(struct inode *inode, struct file *file)
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{
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struct evdev *evdev;
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struct evdev_client *client;
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int i = iminor(inode) - EVDEV_MINOR_BASE;
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unsigned int bufsize;
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int error;
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if (i >= EVDEV_MINORS)
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return -ENODEV;
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error = mutex_lock_interruptible(&evdev_table_mutex);
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if (error)
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return error;
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evdev = evdev_table[i];
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if (evdev)
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get_device(&evdev->dev);
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mutex_unlock(&evdev_table_mutex);
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if (!evdev)
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return -ENODEV;
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bufsize = evdev_compute_buffer_size(evdev->handle.dev);
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client = kzalloc(sizeof(struct evdev_client) +
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bufsize * sizeof(struct input_event),
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GFP_KERNEL);
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if (!client) {
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error = -ENOMEM;
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goto err_put_evdev;
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}
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client->bufsize = bufsize;
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spin_lock_init(&client->buffer_lock);
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client->evdev = evdev;
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evdev_attach_client(evdev, client);
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error = evdev_open_device(evdev);
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if (error)
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goto err_free_client;
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file->private_data = client;
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nonseekable_open(inode, file);
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return 0;
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err_free_client:
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evdev_detach_client(evdev, client);
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kfree(client);
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err_put_evdev:
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put_device(&evdev->dev);
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return error;
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}
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static ssize_t evdev_write(struct file *file, const char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct evdev_client *client = file->private_data;
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struct evdev *evdev = client->evdev;
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struct input_event event;
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int retval = 0;
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if (count < input_event_size())
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return -EINVAL;
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retval = mutex_lock_interruptible(&evdev->mutex);
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if (retval)
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return retval;
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if (!evdev->exist) {
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retval = -ENODEV;
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goto out;
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}
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do {
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if (input_event_from_user(buffer + retval, &event)) {
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retval = -EFAULT;
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goto out;
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}
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retval += input_event_size();
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input_inject_event(&evdev->handle,
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event.type, event.code, event.value);
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} while (retval + input_event_size() <= count);
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out:
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mutex_unlock(&evdev->mutex);
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return retval;
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}
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static int evdev_fetch_next_event(struct evdev_client *client,
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struct input_event *event)
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{
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int have_event;
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spin_lock_irq(&client->buffer_lock);
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have_event = client->packet_head != client->tail;
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if (have_event) {
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*event = client->buffer[client->tail++];
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client->tail &= client->bufsize - 1;
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}
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spin_unlock_irq(&client->buffer_lock);
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return have_event;
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}
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static ssize_t evdev_read(struct file *file, char __user *buffer,
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size_t count, loff_t *ppos)
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{
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struct evdev_client *client = file->private_data;
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struct evdev *evdev = client->evdev;
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struct input_event event;
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int retval = 0;
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if (count < input_event_size())
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return -EINVAL;
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if (!(file->f_flags & O_NONBLOCK)) {
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retval = wait_event_interruptible(evdev->wait,
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client->packet_head != client->tail ||
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!evdev->exist);
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if (retval)
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return retval;
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}
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if (!evdev->exist)
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return -ENODEV;
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while (retval + input_event_size() <= count &&
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evdev_fetch_next_event(client, &event)) {
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if (input_event_to_user(buffer + retval, &event))
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return -EFAULT;
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retval += input_event_size();
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}
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if (retval == 0 && (file->f_flags & O_NONBLOCK))
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return -EAGAIN;
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return retval;
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}
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/* No kernel lock - fine */
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static unsigned int evdev_poll(struct file *file, poll_table *wait)
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{
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struct evdev_client *client = file->private_data;
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struct evdev *evdev = client->evdev;
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unsigned int mask;
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poll_wait(file, &evdev->wait, wait);
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mask = evdev->exist ? POLLOUT | POLLWRNORM : POLLHUP | POLLERR;
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if (client->packet_head != client->tail)
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mask |= POLLIN | POLLRDNORM;
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return mask;
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}
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#ifdef CONFIG_COMPAT
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#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
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#define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
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#ifdef __BIG_ENDIAN
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static int bits_to_user(unsigned long *bits, unsigned int maxbit,
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unsigned int maxlen, void __user *p, int compat)
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{
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int len, i;
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if (compat) {
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len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
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if (len > maxlen)
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len = maxlen;
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for (i = 0; i < len / sizeof(compat_long_t); i++)
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if (copy_to_user((compat_long_t __user *) p + i,
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(compat_long_t *) bits +
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i + 1 - ((i % 2) << 1),
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sizeof(compat_long_t)))
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return -EFAULT;
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} else {
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len = BITS_TO_LONGS(maxbit) * sizeof(long);
|
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if (len > maxlen)
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len = maxlen;
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|
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if (copy_to_user(p, bits, len))
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return -EFAULT;
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}
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|
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return len;
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}
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#else
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static int bits_to_user(unsigned long *bits, unsigned int maxbit,
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unsigned int maxlen, void __user *p, int compat)
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{
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int len = compat ?
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BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) :
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BITS_TO_LONGS(maxbit) * sizeof(long);
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|
|
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if (len > maxlen)
|
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len = maxlen;
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|
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return copy_to_user(p, bits, len) ? -EFAULT : len;
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}
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#endif /* __BIG_ENDIAN */
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|
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#else
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|
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static int bits_to_user(unsigned long *bits, unsigned int maxbit,
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unsigned int maxlen, void __user *p, int compat)
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{
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int len = BITS_TO_LONGS(maxbit) * sizeof(long);
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|
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if (len > maxlen)
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len = maxlen;
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|
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return copy_to_user(p, bits, len) ? -EFAULT : len;
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}
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|
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#endif /* CONFIG_COMPAT */
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|
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static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
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{
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int len;
|
|
|
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if (!str)
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return -ENOENT;
|
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|
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len = strlen(str) + 1;
|
|
if (len > maxlen)
|
|
len = maxlen;
|
|
|
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return copy_to_user(p, str, len) ? -EFAULT : len;
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}
|
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|
|
#define OLD_KEY_MAX 0x1ff
|
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static int handle_eviocgbit(struct input_dev *dev,
|
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unsigned int type, unsigned int size,
|
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void __user *p, int compat_mode)
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{
|
|
static unsigned long keymax_warn_time;
|
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unsigned long *bits;
|
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int len;
|
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|
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switch (type) {
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|
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case 0: bits = dev->evbit; len = EV_MAX; break;
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case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
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case EV_REL: bits = dev->relbit; len = REL_MAX; break;
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case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
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case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
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case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
|
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case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
|
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case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
|
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case EV_SW: bits = dev->swbit; len = SW_MAX; break;
|
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default: return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Work around bugs in userspace programs that like to do
|
|
* EVIOCGBIT(EV_KEY, KEY_MAX) and not realize that 'len'
|
|
* should be in bytes, not in bits.
|
|
*/
|
|
if (type == EV_KEY && size == OLD_KEY_MAX) {
|
|
len = OLD_KEY_MAX;
|
|
if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000))
|
|
pr_warning("(EVIOCGBIT): Suspicious buffer size %u, "
|
|
"limiting output to %zu bytes. See "
|
|
"http://userweb.kernel.org/~dtor/eviocgbit-bug.html\n",
|
|
OLD_KEY_MAX,
|
|
BITS_TO_LONGS(OLD_KEY_MAX) * sizeof(long));
|
|
}
|
|
|
|
return bits_to_user(bits, len, size, p, compat_mode);
|
|
}
|
|
#undef OLD_KEY_MAX
|
|
|
|
static int evdev_handle_get_keycode(struct input_dev *dev, void __user *p)
|
|
{
|
|
struct input_keymap_entry ke = {
|
|
.len = sizeof(unsigned int),
|
|
.flags = 0,
|
|
};
|
|
int __user *ip = (int __user *)p;
|
|
int error;
|
|
|
|
/* legacy case */
|
|
if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
|
|
return -EFAULT;
|
|
|
|
error = input_get_keycode(dev, &ke);
|
|
if (error)
|
|
return error;
|
|
|
|
if (put_user(ke.keycode, ip + 1))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int evdev_handle_get_keycode_v2(struct input_dev *dev, void __user *p)
|
|
{
|
|
struct input_keymap_entry ke;
|
|
int error;
|
|
|
|
if (copy_from_user(&ke, p, sizeof(ke)))
|
|
return -EFAULT;
|
|
|
|
error = input_get_keycode(dev, &ke);
|
|
if (error)
|
|
return error;
|
|
|
|
if (copy_to_user(p, &ke, sizeof(ke)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int evdev_handle_set_keycode(struct input_dev *dev, void __user *p)
|
|
{
|
|
struct input_keymap_entry ke = {
|
|
.len = sizeof(unsigned int),
|
|
.flags = 0,
|
|
};
|
|
int __user *ip = (int __user *)p;
|
|
|
|
if (copy_from_user(ke.scancode, p, sizeof(unsigned int)))
|
|
return -EFAULT;
|
|
|
|
if (get_user(ke.keycode, ip + 1))
|
|
return -EFAULT;
|
|
|
|
return input_set_keycode(dev, &ke);
|
|
}
|
|
|
|
static int evdev_handle_set_keycode_v2(struct input_dev *dev, void __user *p)
|
|
{
|
|
struct input_keymap_entry ke;
|
|
|
|
if (copy_from_user(&ke, p, sizeof(ke)))
|
|
return -EFAULT;
|
|
|
|
if (ke.len > sizeof(ke.scancode))
|
|
return -EINVAL;
|
|
|
|
return input_set_keycode(dev, &ke);
|
|
}
|
|
|
|
static int evdev_handle_mt_request(struct input_dev *dev,
|
|
unsigned int size,
|
|
int __user *ip)
|
|
{
|
|
const struct input_mt_slot *mt = dev->mt;
|
|
unsigned int code;
|
|
int max_slots;
|
|
int i;
|
|
|
|
if (get_user(code, &ip[0]))
|
|
return -EFAULT;
|
|
if (!input_is_mt_value(code))
|
|
return -EINVAL;
|
|
|
|
max_slots = (size - sizeof(__u32)) / sizeof(__s32);
|
|
for (i = 0; i < dev->mtsize && i < max_slots; i++)
|
|
if (put_user(input_mt_get_value(&mt[i], code), &ip[1 + i]))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long evdev_do_ioctl(struct file *file, unsigned int cmd,
|
|
void __user *p, int compat_mode)
|
|
{
|
|
struct evdev_client *client = file->private_data;
|
|
struct evdev *evdev = client->evdev;
|
|
struct input_dev *dev = evdev->handle.dev;
|
|
struct input_absinfo abs;
|
|
struct ff_effect effect;
|
|
int __user *ip = (int __user *)p;
|
|
unsigned int i, t, u, v;
|
|
unsigned int size;
|
|
int error;
|
|
|
|
/* First we check for fixed-length commands */
|
|
switch (cmd) {
|
|
|
|
case EVIOCGVERSION:
|
|
return put_user(EV_VERSION, ip);
|
|
|
|
case EVIOCGID:
|
|
if (copy_to_user(p, &dev->id, sizeof(struct input_id)))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case EVIOCGREP:
|
|
if (!test_bit(EV_REP, dev->evbit))
|
|
return -ENOSYS;
|
|
if (put_user(dev->rep[REP_DELAY], ip))
|
|
return -EFAULT;
|
|
if (put_user(dev->rep[REP_PERIOD], ip + 1))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case EVIOCSREP:
|
|
if (!test_bit(EV_REP, dev->evbit))
|
|
return -ENOSYS;
|
|
if (get_user(u, ip))
|
|
return -EFAULT;
|
|
if (get_user(v, ip + 1))
|
|
return -EFAULT;
|
|
|
|
input_inject_event(&evdev->handle, EV_REP, REP_DELAY, u);
|
|
input_inject_event(&evdev->handle, EV_REP, REP_PERIOD, v);
|
|
|
|
return 0;
|
|
|
|
case EVIOCRMFF:
|
|
return input_ff_erase(dev, (int)(unsigned long) p, file);
|
|
|
|
case EVIOCGEFFECTS:
|
|
i = test_bit(EV_FF, dev->evbit) ?
|
|
dev->ff->max_effects : 0;
|
|
if (put_user(i, ip))
|
|
return -EFAULT;
|
|
return 0;
|
|
|
|
case EVIOCGRAB:
|
|
if (p)
|
|
return evdev_grab(evdev, client);
|
|
else
|
|
return evdev_ungrab(evdev, client);
|
|
|
|
case EVIOCSCLOCKID:
|
|
if (copy_from_user(&i, p, sizeof(unsigned int)))
|
|
return -EFAULT;
|
|
if (i != CLOCK_MONOTONIC && i != CLOCK_REALTIME)
|
|
return -EINVAL;
|
|
client->clkid = i;
|
|
return 0;
|
|
|
|
case EVIOCGKEYCODE:
|
|
return evdev_handle_get_keycode(dev, p);
|
|
|
|
case EVIOCSKEYCODE:
|
|
return evdev_handle_set_keycode(dev, p);
|
|
|
|
case EVIOCGKEYCODE_V2:
|
|
return evdev_handle_get_keycode_v2(dev, p);
|
|
|
|
case EVIOCSKEYCODE_V2:
|
|
return evdev_handle_set_keycode_v2(dev, p);
|
|
}
|
|
|
|
size = _IOC_SIZE(cmd);
|
|
|
|
/* Now check variable-length commands */
|
|
#define EVIOC_MASK_SIZE(nr) ((nr) & ~(_IOC_SIZEMASK << _IOC_SIZESHIFT))
|
|
switch (EVIOC_MASK_SIZE(cmd)) {
|
|
|
|
case EVIOCGPROP(0):
|
|
return bits_to_user(dev->propbit, INPUT_PROP_MAX,
|
|
size, p, compat_mode);
|
|
|
|
case EVIOCGMTSLOTS(0):
|
|
return evdev_handle_mt_request(dev, size, ip);
|
|
|
|
case EVIOCGKEY(0):
|
|
return bits_to_user(dev->key, KEY_MAX, size, p, compat_mode);
|
|
|
|
case EVIOCGLED(0):
|
|
return bits_to_user(dev->led, LED_MAX, size, p, compat_mode);
|
|
|
|
case EVIOCGSND(0):
|
|
return bits_to_user(dev->snd, SND_MAX, size, p, compat_mode);
|
|
|
|
case EVIOCGSW(0):
|
|
return bits_to_user(dev->sw, SW_MAX, size, p, compat_mode);
|
|
|
|
case EVIOCGNAME(0):
|
|
return str_to_user(dev->name, size, p);
|
|
|
|
case EVIOCGPHYS(0):
|
|
return str_to_user(dev->phys, size, p);
|
|
|
|
case EVIOCGUNIQ(0):
|
|
return str_to_user(dev->uniq, size, p);
|
|
|
|
case EVIOC_MASK_SIZE(EVIOCSFF):
|
|
if (input_ff_effect_from_user(p, size, &effect))
|
|
return -EFAULT;
|
|
|
|
error = input_ff_upload(dev, &effect, file);
|
|
|
|
if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
|
|
return -EFAULT;
|
|
|
|
return error;
|
|
}
|
|
|
|
/* Multi-number variable-length handlers */
|
|
if (_IOC_TYPE(cmd) != 'E')
|
|
return -EINVAL;
|
|
|
|
if (_IOC_DIR(cmd) == _IOC_READ) {
|
|
|
|
if ((_IOC_NR(cmd) & ~EV_MAX) == _IOC_NR(EVIOCGBIT(0, 0)))
|
|
return handle_eviocgbit(dev,
|
|
_IOC_NR(cmd) & EV_MAX, size,
|
|
p, compat_mode);
|
|
|
|
if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
|
|
|
|
if (!dev->absinfo)
|
|
return -EINVAL;
|
|
|
|
t = _IOC_NR(cmd) & ABS_MAX;
|
|
abs = dev->absinfo[t];
|
|
|
|
if (copy_to_user(p, &abs, min_t(size_t,
|
|
size, sizeof(struct input_absinfo))))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (_IOC_DIR(cmd) == _IOC_WRITE) {
|
|
|
|
if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
|
|
|
|
if (!dev->absinfo)
|
|
return -EINVAL;
|
|
|
|
t = _IOC_NR(cmd) & ABS_MAX;
|
|
|
|
if (copy_from_user(&abs, p, min_t(size_t,
|
|
size, sizeof(struct input_absinfo))))
|
|
return -EFAULT;
|
|
|
|
if (size < sizeof(struct input_absinfo))
|
|
abs.resolution = 0;
|
|
|
|
/* We can't change number of reserved MT slots */
|
|
if (t == ABS_MT_SLOT)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Take event lock to ensure that we are not
|
|
* changing device parameters in the middle
|
|
* of event.
|
|
*/
|
|
spin_lock_irq(&dev->event_lock);
|
|
dev->absinfo[t] = abs;
|
|
spin_unlock_irq(&dev->event_lock);
|
|
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static long evdev_ioctl_handler(struct file *file, unsigned int cmd,
|
|
void __user *p, int compat_mode)
|
|
{
|
|
struct evdev_client *client = file->private_data;
|
|
struct evdev *evdev = client->evdev;
|
|
int retval;
|
|
|
|
retval = mutex_lock_interruptible(&evdev->mutex);
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (!evdev->exist) {
|
|
retval = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
retval = evdev_do_ioctl(file, cmd, p, compat_mode);
|
|
|
|
out:
|
|
mutex_unlock(&evdev->mutex);
|
|
return retval;
|
|
}
|
|
|
|
static long evdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
|
{
|
|
return evdev_ioctl_handler(file, cmd, (void __user *)arg, 0);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long evdev_ioctl_compat(struct file *file,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
return evdev_ioctl_handler(file, cmd, compat_ptr(arg), 1);
|
|
}
|
|
#endif
|
|
|
|
static const struct file_operations evdev_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = evdev_read,
|
|
.write = evdev_write,
|
|
.poll = evdev_poll,
|
|
.open = evdev_open,
|
|
.release = evdev_release,
|
|
.unlocked_ioctl = evdev_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = evdev_ioctl_compat,
|
|
#endif
|
|
.fasync = evdev_fasync,
|
|
.flush = evdev_flush,
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
static int evdev_install_chrdev(struct evdev *evdev)
|
|
{
|
|
/*
|
|
* No need to do any locking here as calls to connect and
|
|
* disconnect are serialized by the input core
|
|
*/
|
|
evdev_table[evdev->minor] = evdev;
|
|
return 0;
|
|
}
|
|
|
|
static void evdev_remove_chrdev(struct evdev *evdev)
|
|
{
|
|
/*
|
|
* Lock evdev table to prevent race with evdev_open()
|
|
*/
|
|
mutex_lock(&evdev_table_mutex);
|
|
evdev_table[evdev->minor] = NULL;
|
|
mutex_unlock(&evdev_table_mutex);
|
|
}
|
|
|
|
/*
|
|
* Mark device non-existent. This disables writes, ioctls and
|
|
* prevents new users from opening the device. Already posted
|
|
* blocking reads will stay, however new ones will fail.
|
|
*/
|
|
static void evdev_mark_dead(struct evdev *evdev)
|
|
{
|
|
mutex_lock(&evdev->mutex);
|
|
evdev->exist = false;
|
|
mutex_unlock(&evdev->mutex);
|
|
}
|
|
|
|
static void evdev_cleanup(struct evdev *evdev)
|
|
{
|
|
struct input_handle *handle = &evdev->handle;
|
|
|
|
evdev_mark_dead(evdev);
|
|
evdev_hangup(evdev);
|
|
evdev_remove_chrdev(evdev);
|
|
|
|
/* evdev is marked dead so no one else accesses evdev->open */
|
|
if (evdev->open) {
|
|
input_flush_device(handle, NULL);
|
|
input_close_device(handle);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Create new evdev device. Note that input core serializes calls
|
|
* to connect and disconnect so we don't need to lock evdev_table here.
|
|
*/
|
|
static int evdev_connect(struct input_handler *handler, struct input_dev *dev,
|
|
const struct input_device_id *id)
|
|
{
|
|
struct evdev *evdev;
|
|
int minor;
|
|
int error;
|
|
|
|
for (minor = 0; minor < EVDEV_MINORS; minor++)
|
|
if (!evdev_table[minor])
|
|
break;
|
|
|
|
if (minor == EVDEV_MINORS) {
|
|
pr_err("no more free evdev devices\n");
|
|
return -ENFILE;
|
|
}
|
|
|
|
evdev = kzalloc(sizeof(struct evdev), GFP_KERNEL);
|
|
if (!evdev)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&evdev->client_list);
|
|
spin_lock_init(&evdev->client_lock);
|
|
mutex_init(&evdev->mutex);
|
|
init_waitqueue_head(&evdev->wait);
|
|
|
|
dev_set_name(&evdev->dev, "event%d", minor);
|
|
evdev->exist = true;
|
|
evdev->minor = minor;
|
|
|
|
evdev->handle.dev = input_get_device(dev);
|
|
evdev->handle.name = dev_name(&evdev->dev);
|
|
evdev->handle.handler = handler;
|
|
evdev->handle.private = evdev;
|
|
|
|
evdev->dev.devt = MKDEV(INPUT_MAJOR, EVDEV_MINOR_BASE + minor);
|
|
evdev->dev.class = &input_class;
|
|
evdev->dev.parent = &dev->dev;
|
|
evdev->dev.release = evdev_free;
|
|
device_initialize(&evdev->dev);
|
|
|
|
error = input_register_handle(&evdev->handle);
|
|
if (error)
|
|
goto err_free_evdev;
|
|
|
|
error = evdev_install_chrdev(evdev);
|
|
if (error)
|
|
goto err_unregister_handle;
|
|
|
|
error = device_add(&evdev->dev);
|
|
if (error)
|
|
goto err_cleanup_evdev;
|
|
|
|
return 0;
|
|
|
|
err_cleanup_evdev:
|
|
evdev_cleanup(evdev);
|
|
err_unregister_handle:
|
|
input_unregister_handle(&evdev->handle);
|
|
err_free_evdev:
|
|
put_device(&evdev->dev);
|
|
return error;
|
|
}
|
|
|
|
static void evdev_disconnect(struct input_handle *handle)
|
|
{
|
|
struct evdev *evdev = handle->private;
|
|
|
|
device_del(&evdev->dev);
|
|
evdev_cleanup(evdev);
|
|
input_unregister_handle(handle);
|
|
put_device(&evdev->dev);
|
|
}
|
|
|
|
static const struct input_device_id evdev_ids[] = {
|
|
{ .driver_info = 1 }, /* Matches all devices */
|
|
{ }, /* Terminating zero entry */
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(input, evdev_ids);
|
|
|
|
static struct input_handler evdev_handler = {
|
|
.event = evdev_event,
|
|
.connect = evdev_connect,
|
|
.disconnect = evdev_disconnect,
|
|
.fops = &evdev_fops,
|
|
.minor = EVDEV_MINOR_BASE,
|
|
.name = "evdev",
|
|
.id_table = evdev_ids,
|
|
};
|
|
|
|
static int __init evdev_init(void)
|
|
{
|
|
return input_register_handler(&evdev_handler);
|
|
}
|
|
|
|
static void __exit evdev_exit(void)
|
|
{
|
|
input_unregister_handler(&evdev_handler);
|
|
}
|
|
|
|
module_init(evdev_init);
|
|
module_exit(evdev_exit);
|
|
|
|
MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
|
|
MODULE_DESCRIPTION("Input driver event char devices");
|
|
MODULE_LICENSE("GPL");
|