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![Dima Zavin](/assets/img/avatar_default.png)
If there is a full packet in the buffer, and we overflow that buffer right after checking for that condition, it would have been possible for us to block indefinitely (rather, until the next full packet) even if the file was marked as O_NONBLOCK. Cc: Jeff Brown <jeffbrown@android.com> Signed-off-by: Dima Zavin <dima@android.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
1015 lines
23 KiB
C
1015 lines
23 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.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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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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{
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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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do_gettimeofday(&event.time);
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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);
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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);
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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;
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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;
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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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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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|
|
#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 = BITS_TO_LONGS(maxbit) * sizeof(long);
|
|
|
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if (len > maxlen)
|
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len = maxlen;
|
|
|
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return copy_to_user(p, bits, len) ? -EFAULT : len;
|
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}
|
|
|
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#endif /* CONFIG_COMPAT */
|
|
|
|
static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
|
|
{
|
|
int len;
|
|
|
|
if (!str)
|
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return -ENOENT;
|
|
|
|
len = strlen(str) + 1;
|
|
if (len > maxlen)
|
|
len = maxlen;
|
|
|
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return copy_to_user(p, str, len) ? -EFAULT : len;
|
|
}
|
|
|
|
#define OLD_KEY_MAX 0x1ff
|
|
static int handle_eviocgbit(struct input_dev *dev,
|
|
unsigned int type, unsigned int size,
|
|
void __user *p, int compat_mode)
|
|
{
|
|
static unsigned long keymax_warn_time;
|
|
unsigned long *bits;
|
|
int len;
|
|
|
|
switch (type) {
|
|
|
|
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;
|
|
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 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 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 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");
|