linux/drivers/input/misc/uinput.c

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/*
* User level driver support for input subsystem
*
* Heavily based on evdev.c by Vojtech Pavlik
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
*
* Changes/Revisions:
* 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>)
* - added force feedback support
* - added UI_SET_PHYS
* 0.1 20/06/2002
* - first public version
*/
#include <linux/poll.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/smp_lock.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/uinput.h>
static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
struct uinput_device *udev;
udev = dev->private;
udev->buff[udev->head].type = type;
udev->buff[udev->head].code = code;
udev->buff[udev->head].value = value;
do_gettimeofday(&udev->buff[udev->head].time);
udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
wake_up_interruptible(&udev->waitq);
return 0;
}
static int uinput_request_alloc_id(struct uinput_device *udev, struct uinput_request *request)
{
/* Atomically allocate an ID for the given request. Returns 0 on success. */
int id;
int err = -1;
spin_lock(&udev->requests_lock);
for (id = 0; id < UINPUT_NUM_REQUESTS; id++)
if (!udev->requests[id]) {
request->id = id;
udev->requests[id] = request;
err = 0;
break;
}
spin_unlock(&udev->requests_lock);
return err;
}
static struct uinput_request* uinput_request_find(struct uinput_device *udev, int id)
{
/* Find an input request, by ID. Returns NULL if the ID isn't valid. */
if (id >= UINPUT_NUM_REQUESTS || id < 0)
return NULL;
return udev->requests[id];
}
static inline int uinput_request_reserve_slot(struct uinput_device *udev, struct uinput_request *request)
{
/* Allocate slot. If none are available right away, wait. */
return wait_event_interruptible(udev->requests_waitq,
!uinput_request_alloc_id(udev, request));
}
static void uinput_request_done(struct uinput_device *udev, struct uinput_request *request)
{
complete(&request->done);
/* Mark slot as available */
udev->requests[request->id] = NULL;
wake_up_interruptible(&udev->requests_waitq);
}
static int uinput_request_submit(struct input_dev *dev, struct uinput_request *request)
{
int retval;
/* Tell our userspace app about this new request by queueing an input event */
uinput_dev_event(dev, EV_UINPUT, request->code, request->id);
/* Wait for the request to complete */
retval = wait_for_completion_interruptible(&request->done);
if (!retval)
retval = request->retval;
return retval;
}
static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect)
{
struct uinput_request request;
int retval;
if (!test_bit(EV_FF, dev->evbit))
return -ENOSYS;
request.id = -1;
init_completion(&request.done);
request.code = UI_FF_UPLOAD;
request.u.effect = effect;
retval = uinput_request_reserve_slot(dev->private, &request);
if (!retval)
retval = uinput_request_submit(dev, &request);
return retval;
}
static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
{
struct uinput_request request;
int retval;
if (!test_bit(EV_FF, dev->evbit))
return -ENOSYS;
request.id = -1;
init_completion(&request.done);
request.code = UI_FF_ERASE;
request.u.effect_id = effect_id;
retval = uinput_request_reserve_slot(dev->private, &request);
if (!retval)
retval = uinput_request_submit(dev, &request);
return retval;
}
static int uinput_create_device(struct uinput_device *udev)
{
if (!udev->dev->name) {
printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
return -EINVAL;
}
udev->dev->event = uinput_dev_event;
udev->dev->upload_effect = uinput_dev_upload_effect;
udev->dev->erase_effect = uinput_dev_erase_effect;
udev->dev->private = udev;
init_waitqueue_head(&udev->waitq);
input_register_device(udev->dev);
set_bit(UIST_CREATED, &udev->state);
return 0;
}
static int uinput_destroy_device(struct uinput_device *udev)
{
if (!test_bit(UIST_CREATED, &udev->state)) {
printk(KERN_WARNING "%s: create the device first\n", UINPUT_NAME);
return -EINVAL;
}
input_unregister_device(udev->dev);
clear_bit(UIST_CREATED, &udev->state);
return 0;
}
static int uinput_open(struct inode *inode, struct file *file)
{
struct uinput_device *newdev;
struct input_dev *newinput;
newdev = kmalloc(sizeof(struct uinput_device), GFP_KERNEL);
if (!newdev)
goto error;
memset(newdev, 0, sizeof(struct uinput_device));
spin_lock_init(&newdev->requests_lock);
init_waitqueue_head(&newdev->requests_waitq);
newinput = kmalloc(sizeof(struct input_dev), GFP_KERNEL);
if (!newinput)
goto cleanup;
memset(newinput, 0, sizeof(struct input_dev));
newdev->dev = newinput;
file->private_data = newdev;
return 0;
cleanup:
kfree(newdev);
error:
return -ENOMEM;
}
static int uinput_validate_absbits(struct input_dev *dev)
{
unsigned int cnt;
int retval = 0;
for (cnt = 0; cnt < ABS_MAX + 1; cnt++) {
if (!test_bit(cnt, dev->absbit))
continue;
if ((dev->absmax[cnt] <= dev->absmin[cnt])) {
printk(KERN_DEBUG
"%s: invalid abs[%02x] min:%d max:%d\n",
UINPUT_NAME, cnt,
dev->absmin[cnt], dev->absmax[cnt]);
retval = -EINVAL;
break;
}
if (dev->absflat[cnt] > (dev->absmax[cnt] - dev->absmin[cnt])) {
printk(KERN_DEBUG
"%s: absflat[%02x] out of range: %d "
"(min:%d/max:%d)\n",
UINPUT_NAME, cnt, dev->absflat[cnt],
dev->absmin[cnt], dev->absmax[cnt]);
retval = -EINVAL;
break;
}
}
return retval;
}
static int uinput_alloc_device(struct file *file, const char __user *buffer, size_t count)
{
struct uinput_user_dev *user_dev;
struct input_dev *dev;
struct uinput_device *udev;
char *name;
int size;
int retval;
retval = count;
udev = file->private_data;
dev = udev->dev;
user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL);
if (!user_dev) {
retval = -ENOMEM;
goto exit;
}
if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) {
retval = -EFAULT;
goto exit;
}
if (dev->name)
kfree(dev->name);
size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1;
dev->name = name = kmalloc(size, GFP_KERNEL);
if (!name) {
retval = -ENOMEM;
goto exit;
}
strlcpy(name, user_dev->name, size);
dev->id.bustype = user_dev->id.bustype;
dev->id.vendor = user_dev->id.vendor;
dev->id.product = user_dev->id.product;
dev->id.version = user_dev->id.version;
dev->ff_effects_max = user_dev->ff_effects_max;
size = sizeof(int) * (ABS_MAX + 1);
memcpy(dev->absmax, user_dev->absmax, size);
memcpy(dev->absmin, user_dev->absmin, size);
memcpy(dev->absfuzz, user_dev->absfuzz, size);
memcpy(dev->absflat, user_dev->absflat, size);
/* check if absmin/absmax/absfuzz/absflat are filled as
* told in Documentation/input/input-programming.txt */
if (test_bit(EV_ABS, dev->evbit)) {
int err = uinput_validate_absbits(dev);
if (err < 0) {
retval = err;
kfree(dev->name);
}
}
exit:
kfree(user_dev);
return retval;
}
static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
{
struct uinput_device *udev = file->private_data;
if (test_bit(UIST_CREATED, &udev->state)) {
struct input_event ev;
if (copy_from_user(&ev, buffer, sizeof(struct input_event)))
return -EFAULT;
input_event(udev->dev, ev.type, ev.code, ev.value);
} else
count = uinput_alloc_device(file, buffer, count);
return count;
}
static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
{
struct uinput_device *udev = file->private_data;
int retval = 0;
if (!test_bit(UIST_CREATED, &udev->state))
return -ENODEV;
if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK))
return -EAGAIN;
retval = wait_event_interruptible(udev->waitq,
udev->head != udev->tail || !test_bit(UIST_CREATED, &udev->state));
if (retval)
return retval;
if (!test_bit(UIST_CREATED, &udev->state))
return -ENODEV;
while ((udev->head != udev->tail) &&
(retval + sizeof(struct input_event) <= count)) {
if (copy_to_user(buffer + retval, &udev->buff[udev->tail], sizeof(struct input_event)))
return -EFAULT;
udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
retval += sizeof(struct input_event);
}
return retval;
}
static unsigned int uinput_poll(struct file *file, poll_table *wait)
{
struct uinput_device *udev = file->private_data;
poll_wait(file, &udev->waitq, wait);
if (udev->head != udev->tail)
return POLLIN | POLLRDNORM;
return 0;
}
static int uinput_burn_device(struct uinput_device *udev)
{
if (test_bit(UIST_CREATED, &udev->state))
uinput_destroy_device(udev);
if (udev->dev->name)
kfree(udev->dev->name);
if (udev->dev->phys)
kfree(udev->dev->phys);
kfree(udev->dev);
kfree(udev);
return 0;
}
static int uinput_close(struct inode *inode, struct file *file)
{
uinput_burn_device(file->private_data);
return 0;
}
static int uinput_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
int retval = 0;
struct uinput_device *udev;
void __user *p = (void __user *)arg;
struct uinput_ff_upload ff_up;
struct uinput_ff_erase ff_erase;
struct uinput_request *req;
int length;
char *phys;
udev = file->private_data;
/* device attributes can not be changed after the device is created */
switch (cmd) {
case UI_SET_EVBIT:
case UI_SET_KEYBIT:
case UI_SET_RELBIT:
case UI_SET_ABSBIT:
case UI_SET_MSCBIT:
case UI_SET_LEDBIT:
case UI_SET_SNDBIT:
case UI_SET_FFBIT:
case UI_SET_PHYS:
if (test_bit(UIST_CREATED, &udev->state))
return -EINVAL;
}
switch (cmd) {
case UI_DEV_CREATE:
retval = uinput_create_device(udev);
break;
case UI_DEV_DESTROY:
retval = uinput_destroy_device(udev);
break;
case UI_SET_EVBIT:
if (arg > EV_MAX) {
retval = -EINVAL;
break;
}
set_bit(arg, udev->dev->evbit);
break;
case UI_SET_KEYBIT:
if (arg > KEY_MAX) {
retval = -EINVAL;
break;
}
set_bit(arg, udev->dev->keybit);
break;
case UI_SET_RELBIT:
if (arg > REL_MAX) {
retval = -EINVAL;
break;
}
set_bit(arg, udev->dev->relbit);
break;
case UI_SET_ABSBIT:
if (arg > ABS_MAX) {
retval = -EINVAL;
break;
}
set_bit(arg, udev->dev->absbit);
break;
case UI_SET_MSCBIT:
if (arg > MSC_MAX) {
retval = -EINVAL;
break;
}
set_bit(arg, udev->dev->mscbit);
break;
case UI_SET_LEDBIT:
if (arg > LED_MAX) {
retval = -EINVAL;
break;
}
set_bit(arg, udev->dev->ledbit);
break;
case UI_SET_SNDBIT:
if (arg > SND_MAX) {
retval = -EINVAL;
break;
}
set_bit(arg, udev->dev->sndbit);
break;
case UI_SET_FFBIT:
if (arg > FF_MAX) {
retval = -EINVAL;
break;
}
set_bit(arg, udev->dev->ffbit);
break;
case UI_SET_PHYS:
length = strnlen_user(p, 1024);
if (length <= 0) {
retval = -EFAULT;
break;
}
kfree(udev->dev->phys);
udev->dev->phys = phys = kmalloc(length, GFP_KERNEL);
if (!phys) {
retval = -ENOMEM;
break;
}
if (copy_from_user(phys, p, length)) {
udev->dev->phys = NULL;
kfree(phys);
retval = -EFAULT;
break;
}
phys[length - 1] = '\0';
break;
case UI_BEGIN_FF_UPLOAD:
if (copy_from_user(&ff_up, p, sizeof(ff_up))) {
retval = -EFAULT;
break;
}
req = uinput_request_find(udev, ff_up.request_id);
if (!(req && req->code == UI_FF_UPLOAD && req->u.effect)) {
retval = -EINVAL;
break;
}
ff_up.retval = 0;
memcpy(&ff_up.effect, req->u.effect, sizeof(struct ff_effect));
if (copy_to_user(p, &ff_up, sizeof(ff_up))) {
retval = -EFAULT;
break;
}
break;
case UI_BEGIN_FF_ERASE:
if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
retval = -EFAULT;
break;
}
req = uinput_request_find(udev, ff_erase.request_id);
if (!(req && req->code == UI_FF_ERASE)) {
retval = -EINVAL;
break;
}
ff_erase.retval = 0;
ff_erase.effect_id = req->u.effect_id;
if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
retval = -EFAULT;
break;
}
break;
case UI_END_FF_UPLOAD:
if (copy_from_user(&ff_up, p, sizeof(ff_up))) {
retval = -EFAULT;
break;
}
req = uinput_request_find(udev, ff_up.request_id);
if (!(req && req->code == UI_FF_UPLOAD && req->u.effect)) {
retval = -EINVAL;
break;
}
req->retval = ff_up.retval;
memcpy(req->u.effect, &ff_up.effect, sizeof(struct ff_effect));
uinput_request_done(udev, req);
break;
case UI_END_FF_ERASE:
if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
retval = -EFAULT;
break;
}
req = uinput_request_find(udev, ff_erase.request_id);
if (!(req && req->code == UI_FF_ERASE)) {
retval = -EINVAL;
break;
}
req->retval = ff_erase.retval;
uinput_request_done(udev, req);
break;
default:
retval = -EINVAL;
}
return retval;
}
static struct file_operations uinput_fops = {
.owner = THIS_MODULE,
.open = uinput_open,
.release = uinput_close,
.read = uinput_read,
.write = uinput_write,
.poll = uinput_poll,
.ioctl = uinput_ioctl,
};
static struct miscdevice uinput_misc = {
.fops = &uinput_fops,
.minor = UINPUT_MINOR,
.name = UINPUT_NAME,
};
static int __init uinput_init(void)
{
return misc_register(&uinput_misc);
}
static void __exit uinput_exit(void)
{
misc_deregister(&uinput_misc);
}
MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
MODULE_DESCRIPTION("User level driver support for input subsystem");
MODULE_LICENSE("GPL");
module_init(uinput_init);
module_exit(uinput_exit);