You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
896 lines
20 KiB
896 lines
20 KiB
/*
|
|
* Event char devices, giving access to raw input device events.
|
|
*
|
|
* Copyright (c) 1999-2002 Vojtech Pavlik
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published by
|
|
* the Free Software Foundation.
|
|
*/
|
|
|
|
#define EVDEV_MINOR_BASE 64
|
|
#define EVDEV_MINORS 32
|
|
#define EVDEV_BUFFER_SIZE 64
|
|
|
|
#include <linux/poll.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/input.h>
|
|
#include <linux/major.h>
|
|
#include <linux/device.h>
|
|
#include "input-compat.h"
|
|
|
|
struct evdev {
|
|
int exist;
|
|
int open;
|
|
int minor;
|
|
struct input_handle handle;
|
|
wait_queue_head_t wait;
|
|
struct evdev_client *grab;
|
|
struct list_head client_list;
|
|
spinlock_t client_lock; /* protects client_list */
|
|
struct mutex mutex;
|
|
struct device dev;
|
|
};
|
|
|
|
struct evdev_client {
|
|
struct input_event buffer[EVDEV_BUFFER_SIZE];
|
|
int head;
|
|
int tail;
|
|
spinlock_t buffer_lock; /* protects access to buffer, head and tail */
|
|
struct fasync_struct *fasync;
|
|
struct evdev *evdev;
|
|
struct list_head node;
|
|
};
|
|
|
|
static struct evdev *evdev_table[EVDEV_MINORS];
|
|
static DEFINE_MUTEX(evdev_table_mutex);
|
|
|
|
static void evdev_pass_event(struct evdev_client *client,
|
|
struct input_event *event)
|
|
{
|
|
/*
|
|
* Interrupts are disabled, just acquire the lock
|
|
*/
|
|
spin_lock(&client->buffer_lock);
|
|
client->buffer[client->head++] = *event;
|
|
client->head &= EVDEV_BUFFER_SIZE - 1;
|
|
spin_unlock(&client->buffer_lock);
|
|
|
|
kill_fasync(&client->fasync, SIGIO, POLL_IN);
|
|
}
|
|
|
|
/*
|
|
* Pass incoming event to all connected clients.
|
|
*/
|
|
static void evdev_event(struct input_handle *handle,
|
|
unsigned int type, unsigned int code, int value)
|
|
{
|
|
struct evdev *evdev = handle->private;
|
|
struct evdev_client *client;
|
|
struct input_event event;
|
|
|
|
do_gettimeofday(&event.time);
|
|
event.type = type;
|
|
event.code = code;
|
|
event.value = value;
|
|
|
|
rcu_read_lock();
|
|
|
|
client = rcu_dereference(evdev->grab);
|
|
if (client)
|
|
evdev_pass_event(client, &event);
|
|
else
|
|
list_for_each_entry_rcu(client, &evdev->client_list, node)
|
|
evdev_pass_event(client, &event);
|
|
|
|
rcu_read_unlock();
|
|
|
|
wake_up_interruptible(&evdev->wait);
|
|
}
|
|
|
|
static int evdev_fasync(int fd, struct file *file, int on)
|
|
{
|
|
struct evdev_client *client = file->private_data;
|
|
|
|
return fasync_helper(fd, file, on, &client->fasync);
|
|
}
|
|
|
|
static int evdev_flush(struct file *file, fl_owner_t id)
|
|
{
|
|
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;
|
|
else
|
|
retval = input_flush_device(&evdev->handle, file);
|
|
|
|
mutex_unlock(&evdev->mutex);
|
|
return retval;
|
|
}
|
|
|
|
static void evdev_free(struct device *dev)
|
|
{
|
|
struct evdev *evdev = container_of(dev, struct evdev, dev);
|
|
|
|
input_put_device(evdev->handle.dev);
|
|
kfree(evdev);
|
|
}
|
|
|
|
/*
|
|
* Grabs an event device (along with underlying input device).
|
|
* This function is called with evdev->mutex taken.
|
|
*/
|
|
static int evdev_grab(struct evdev *evdev, struct evdev_client *client)
|
|
{
|
|
int error;
|
|
|
|
if (evdev->grab)
|
|
return -EBUSY;
|
|
|
|
error = input_grab_device(&evdev->handle);
|
|
if (error)
|
|
return error;
|
|
|
|
rcu_assign_pointer(evdev->grab, client);
|
|
synchronize_rcu();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int evdev_ungrab(struct evdev *evdev, struct evdev_client *client)
|
|
{
|
|
if (evdev->grab != client)
|
|
return -EINVAL;
|
|
|
|
rcu_assign_pointer(evdev->grab, NULL);
|
|
synchronize_rcu();
|
|
input_release_device(&evdev->handle);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void evdev_attach_client(struct evdev *evdev,
|
|
struct evdev_client *client)
|
|
{
|
|
spin_lock(&evdev->client_lock);
|
|
list_add_tail_rcu(&client->node, &evdev->client_list);
|
|
spin_unlock(&evdev->client_lock);
|
|
synchronize_rcu();
|
|
}
|
|
|
|
static void evdev_detach_client(struct evdev *evdev,
|
|
struct evdev_client *client)
|
|
{
|
|
spin_lock(&evdev->client_lock);
|
|
list_del_rcu(&client->node);
|
|
spin_unlock(&evdev->client_lock);
|
|
synchronize_rcu();
|
|
}
|
|
|
|
static int evdev_open_device(struct evdev *evdev)
|
|
{
|
|
int retval;
|
|
|
|
retval = mutex_lock_interruptible(&evdev->mutex);
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (!evdev->exist)
|
|
retval = -ENODEV;
|
|
else if (!evdev->open++) {
|
|
retval = input_open_device(&evdev->handle);
|
|
if (retval)
|
|
evdev->open--;
|
|
}
|
|
|
|
mutex_unlock(&evdev->mutex);
|
|
return retval;
|
|
}
|
|
|
|
static void evdev_close_device(struct evdev *evdev)
|
|
{
|
|
mutex_lock(&evdev->mutex);
|
|
|
|
if (evdev->exist && !--evdev->open)
|
|
input_close_device(&evdev->handle);
|
|
|
|
mutex_unlock(&evdev->mutex);
|
|
}
|
|
|
|
/*
|
|
* Wake up users waiting for IO so they can disconnect from
|
|
* dead device.
|
|
*/
|
|
static void evdev_hangup(struct evdev *evdev)
|
|
{
|
|
struct evdev_client *client;
|
|
|
|
spin_lock(&evdev->client_lock);
|
|
list_for_each_entry(client, &evdev->client_list, node)
|
|
kill_fasync(&client->fasync, SIGIO, POLL_HUP);
|
|
spin_unlock(&evdev->client_lock);
|
|
|
|
wake_up_interruptible(&evdev->wait);
|
|
}
|
|
|
|
static int evdev_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct evdev_client *client = file->private_data;
|
|
struct evdev *evdev = client->evdev;
|
|
|
|
mutex_lock(&evdev->mutex);
|
|
if (evdev->grab == client)
|
|
evdev_ungrab(evdev, client);
|
|
mutex_unlock(&evdev->mutex);
|
|
|
|
evdev_detach_client(evdev, client);
|
|
kfree(client);
|
|
|
|
evdev_close_device(evdev);
|
|
put_device(&evdev->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int evdev_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct evdev *evdev;
|
|
struct evdev_client *client;
|
|
int i = iminor(inode) - EVDEV_MINOR_BASE;
|
|
int error;
|
|
|
|
if (i >= EVDEV_MINORS)
|
|
return -ENODEV;
|
|
|
|
error = mutex_lock_interruptible(&evdev_table_mutex);
|
|
if (error)
|
|
return error;
|
|
evdev = evdev_table[i];
|
|
if (evdev)
|
|
get_device(&evdev->dev);
|
|
mutex_unlock(&evdev_table_mutex);
|
|
|
|
if (!evdev)
|
|
return -ENODEV;
|
|
|
|
client = kzalloc(sizeof(struct evdev_client), GFP_KERNEL);
|
|
if (!client) {
|
|
error = -ENOMEM;
|
|
goto err_put_evdev;
|
|
}
|
|
|
|
spin_lock_init(&client->buffer_lock);
|
|
client->evdev = evdev;
|
|
evdev_attach_client(evdev, client);
|
|
|
|
error = evdev_open_device(evdev);
|
|
if (error)
|
|
goto err_free_client;
|
|
|
|
file->private_data = client;
|
|
return 0;
|
|
|
|
err_free_client:
|
|
evdev_detach_client(evdev, client);
|
|
kfree(client);
|
|
err_put_evdev:
|
|
put_device(&evdev->dev);
|
|
return error;
|
|
}
|
|
|
|
static ssize_t evdev_write(struct file *file, const char __user *buffer,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct evdev_client *client = file->private_data;
|
|
struct evdev *evdev = client->evdev;
|
|
struct input_event event;
|
|
int retval;
|
|
|
|
retval = mutex_lock_interruptible(&evdev->mutex);
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (!evdev->exist) {
|
|
retval = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
while (retval < count) {
|
|
|
|
if (input_event_from_user(buffer + retval, &event)) {
|
|
retval = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
input_inject_event(&evdev->handle,
|
|
event.type, event.code, event.value);
|
|
retval += input_event_size();
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&evdev->mutex);
|
|
return retval;
|
|
}
|
|
|
|
static int evdev_fetch_next_event(struct evdev_client *client,
|
|
struct input_event *event)
|
|
{
|
|
int have_event;
|
|
|
|
spin_lock_irq(&client->buffer_lock);
|
|
|
|
have_event = client->head != client->tail;
|
|
if (have_event) {
|
|
*event = client->buffer[client->tail++];
|
|
client->tail &= EVDEV_BUFFER_SIZE - 1;
|
|
}
|
|
|
|
spin_unlock_irq(&client->buffer_lock);
|
|
|
|
return have_event;
|
|
}
|
|
|
|
static ssize_t evdev_read(struct file *file, char __user *buffer,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct evdev_client *client = file->private_data;
|
|
struct evdev *evdev = client->evdev;
|
|
struct input_event event;
|
|
int retval;
|
|
|
|
if (count < input_event_size())
|
|
return -EINVAL;
|
|
|
|
if (client->head == client->tail && evdev->exist &&
|
|
(file->f_flags & O_NONBLOCK))
|
|
return -EAGAIN;
|
|
|
|
retval = wait_event_interruptible(evdev->wait,
|
|
client->head != client->tail || !evdev->exist);
|
|
if (retval)
|
|
return retval;
|
|
|
|
if (!evdev->exist)
|
|
return -ENODEV;
|
|
|
|
while (retval + input_event_size() <= count &&
|
|
evdev_fetch_next_event(client, &event)) {
|
|
|
|
if (input_event_to_user(buffer + retval, &event))
|
|
return -EFAULT;
|
|
|
|
retval += input_event_size();
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/* No kernel lock - fine */
|
|
static unsigned int evdev_poll(struct file *file, poll_table *wait)
|
|
{
|
|
struct evdev_client *client = file->private_data;
|
|
struct evdev *evdev = client->evdev;
|
|
|
|
poll_wait(file, &evdev->wait, wait);
|
|
return ((client->head == client->tail) ? 0 : (POLLIN | POLLRDNORM)) |
|
|
(evdev->exist ? 0 : (POLLHUP | POLLERR));
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
#define BITS_PER_LONG_COMPAT (sizeof(compat_long_t) * 8)
|
|
#define BITS_TO_LONGS_COMPAT(x) ((((x) - 1) / BITS_PER_LONG_COMPAT) + 1)
|
|
|
|
#ifdef __BIG_ENDIAN
|
|
static int bits_to_user(unsigned long *bits, unsigned int maxbit,
|
|
unsigned int maxlen, void __user *p, int compat)
|
|
{
|
|
int len, i;
|
|
|
|
if (compat) {
|
|
len = BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t);
|
|
if (len > maxlen)
|
|
len = maxlen;
|
|
|
|
for (i = 0; i < len / sizeof(compat_long_t); i++)
|
|
if (copy_to_user((compat_long_t __user *) p + i,
|
|
(compat_long_t *) bits +
|
|
i + 1 - ((i % 2) << 1),
|
|
sizeof(compat_long_t)))
|
|
return -EFAULT;
|
|
} else {
|
|
len = BITS_TO_LONGS(maxbit) * sizeof(long);
|
|
if (len > maxlen)
|
|
len = maxlen;
|
|
|
|
if (copy_to_user(p, bits, len))
|
|
return -EFAULT;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
#else
|
|
static int bits_to_user(unsigned long *bits, unsigned int maxbit,
|
|
unsigned int maxlen, void __user *p, int compat)
|
|
{
|
|
int len = compat ?
|
|
BITS_TO_LONGS_COMPAT(maxbit) * sizeof(compat_long_t) :
|
|
BITS_TO_LONGS(maxbit) * sizeof(long);
|
|
|
|
if (len > maxlen)
|
|
len = maxlen;
|
|
|
|
return copy_to_user(p, bits, len) ? -EFAULT : len;
|
|
}
|
|
#endif /* __BIG_ENDIAN */
|
|
|
|
#else
|
|
|
|
static int bits_to_user(unsigned long *bits, unsigned int maxbit,
|
|
unsigned int maxlen, void __user *p, int compat)
|
|
{
|
|
int len = BITS_TO_LONGS(maxbit) * sizeof(long);
|
|
|
|
if (len > maxlen)
|
|
len = maxlen;
|
|
|
|
return copy_to_user(p, bits, len) ? -EFAULT : len;
|
|
}
|
|
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
static int str_to_user(const char *str, unsigned int maxlen, void __user *p)
|
|
{
|
|
int len;
|
|
|
|
if (!str)
|
|
return -ENOENT;
|
|
|
|
len = strlen(str) + 1;
|
|
if (len > maxlen)
|
|
len = maxlen;
|
|
|
|
return copy_to_user(p, str, len) ? -EFAULT : len;
|
|
}
|
|
|
|
#define OLD_KEY_MAX 0x1ff
|
|
static int handle_eviocgbit(struct input_dev *dev, unsigned int cmd, void __user *p, int compat_mode)
|
|
{
|
|
static unsigned long keymax_warn_time;
|
|
unsigned long *bits;
|
|
int len;
|
|
|
|
switch (_IOC_NR(cmd) & EV_MAX) {
|
|
|
|
case 0: bits = dev->evbit; len = EV_MAX; break;
|
|
case EV_KEY: bits = dev->keybit; len = KEY_MAX; break;
|
|
case EV_REL: bits = dev->relbit; len = REL_MAX; break;
|
|
case EV_ABS: bits = dev->absbit; len = ABS_MAX; break;
|
|
case EV_MSC: bits = dev->mscbit; len = MSC_MAX; break;
|
|
case EV_LED: bits = dev->ledbit; len = LED_MAX; break;
|
|
case EV_SND: bits = dev->sndbit; len = SND_MAX; break;
|
|
case EV_FF: bits = dev->ffbit; len = FF_MAX; break;
|
|
case EV_SW: bits = dev->swbit; len = SW_MAX; break;
|
|
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 ((_IOC_NR(cmd) & EV_MAX) == EV_KEY && _IOC_SIZE(cmd) == OLD_KEY_MAX) {
|
|
len = OLD_KEY_MAX;
|
|
if (printk_timed_ratelimit(&keymax_warn_time, 10 * 1000))
|
|
printk(KERN_WARNING
|
|
"evdev.c(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, _IOC_SIZE(cmd), p, compat_mode);
|
|
}
|
|
#undef OLD_KEY_MAX
|
|
|
|
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;
|
|
int i, t, u, v;
|
|
int error;
|
|
|
|
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 EVIOCGKEYCODE:
|
|
if (get_user(t, ip))
|
|
return -EFAULT;
|
|
|
|
error = input_get_keycode(dev, t, &v);
|
|
if (error)
|
|
return error;
|
|
|
|
if (put_user(v, ip + 1))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
|
|
case EVIOCSKEYCODE:
|
|
if (get_user(t, ip) || get_user(v, ip + 1))
|
|
return -EFAULT;
|
|
|
|
return input_set_keycode(dev, t, v);
|
|
|
|
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);
|
|
|
|
default:
|
|
|
|
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, cmd, p, compat_mode);
|
|
|
|
if (_IOC_NR(cmd) == _IOC_NR(EVIOCGKEY(0)))
|
|
return bits_to_user(dev->key, KEY_MAX, _IOC_SIZE(cmd),
|
|
p, compat_mode);
|
|
|
|
if (_IOC_NR(cmd) == _IOC_NR(EVIOCGLED(0)))
|
|
return bits_to_user(dev->led, LED_MAX, _IOC_SIZE(cmd),
|
|
p, compat_mode);
|
|
|
|
if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSND(0)))
|
|
return bits_to_user(dev->snd, SND_MAX, _IOC_SIZE(cmd),
|
|
p, compat_mode);
|
|
|
|
if (_IOC_NR(cmd) == _IOC_NR(EVIOCGSW(0)))
|
|
return bits_to_user(dev->sw, SW_MAX, _IOC_SIZE(cmd),
|
|
p, compat_mode);
|
|
|
|
if (_IOC_NR(cmd) == _IOC_NR(EVIOCGNAME(0)))
|
|
return str_to_user(dev->name, _IOC_SIZE(cmd), p);
|
|
|
|
if (_IOC_NR(cmd) == _IOC_NR(EVIOCGPHYS(0)))
|
|
return str_to_user(dev->phys, _IOC_SIZE(cmd), p);
|
|
|
|
if (_IOC_NR(cmd) == _IOC_NR(EVIOCGUNIQ(0)))
|
|
return str_to_user(dev->uniq, _IOC_SIZE(cmd), p);
|
|
|
|
if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCGABS(0))) {
|
|
|
|
t = _IOC_NR(cmd) & ABS_MAX;
|
|
|
|
abs.value = dev->abs[t];
|
|
abs.minimum = dev->absmin[t];
|
|
abs.maximum = dev->absmax[t];
|
|
abs.fuzz = dev->absfuzz[t];
|
|
abs.flat = dev->absflat[t];
|
|
abs.resolution = dev->absres[t];
|
|
|
|
if (copy_to_user(p, &abs, min_t(size_t,
|
|
_IOC_SIZE(cmd),
|
|
sizeof(struct input_absinfo))))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
}
|
|
|
|
if (_IOC_DIR(cmd) == _IOC_WRITE) {
|
|
|
|
if (_IOC_NR(cmd) == _IOC_NR(EVIOCSFF)) {
|
|
|
|
if (input_ff_effect_from_user(p, _IOC_SIZE(cmd), &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;
|
|
}
|
|
|
|
if ((_IOC_NR(cmd) & ~ABS_MAX) == _IOC_NR(EVIOCSABS(0))) {
|
|
|
|
t = _IOC_NR(cmd) & ABS_MAX;
|
|
|
|
if (copy_from_user(&abs, p, min_t(size_t,
|
|
_IOC_SIZE(cmd),
|
|
sizeof(struct input_absinfo))))
|
|
return -EFAULT;
|
|
|
|
/*
|
|
* Take event lock to ensure that we are not
|
|
* changing device parameters in the middle
|
|
* of event.
|
|
*/
|
|
spin_lock_irq(&dev->event_lock);
|
|
|
|
dev->abs[t] = abs.value;
|
|
dev->absmin[t] = abs.minimum;
|
|
dev->absmax[t] = abs.maximum;
|
|
dev->absfuzz[t] = abs.fuzz;
|
|
dev->absflat[t] = abs.flat;
|
|
dev->absres[t] = _IOC_SIZE(cmd) < sizeof(struct input_absinfo) ?
|
|
0 : abs.resolution;
|
|
|
|
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
|
|
};
|
|
|
|
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 = 0;
|
|
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) {
|
|
printk(KERN_ERR "evdev: 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 = 1;
|
|
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");
|
|
|