// SPDX-License-Identifier: GPL-2.0-or-later
|
/*
|
* User level driver support for input subsystem
|
*
|
* Heavily based on evdev.c by Vojtech Pavlik
|
*
|
* Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
|
*
|
* Changes/Revisions:
|
* 0.4 01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>)
|
* - add UI_GET_SYSNAME ioctl
|
* 0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>)
|
* - updated ff support for the changes in kernel interface
|
* - added MODULE_VERSION
|
* 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 <uapi/linux/uinput.h>
|
#include <linux/poll.h>
|
#include <linux/sched.h>
|
#include <linux/slab.h>
|
#include <linux/module.h>
|
#include <linux/init.h>
|
#include <linux/fs.h>
|
#include <linux/miscdevice.h>
|
#include <linux/overflow.h>
|
#include <linux/input/mt.h>
|
#include "../input-compat.h"
|
|
#define UINPUT_NAME "uinput"
|
#define UINPUT_BUFFER_SIZE 16
|
#define UINPUT_NUM_REQUESTS 16
|
|
enum uinput_state { UIST_NEW_DEVICE, UIST_SETUP_COMPLETE, UIST_CREATED };
|
|
struct uinput_request {
|
unsigned int id;
|
unsigned int code; /* UI_FF_UPLOAD, UI_FF_ERASE */
|
|
int retval;
|
struct completion done;
|
|
union {
|
unsigned int effect_id;
|
struct {
|
struct ff_effect *effect;
|
struct ff_effect *old;
|
} upload;
|
} u;
|
};
|
|
struct uinput_device {
|
struct input_dev *dev;
|
struct mutex mutex;
|
enum uinput_state state;
|
wait_queue_head_t waitq;
|
unsigned char ready;
|
unsigned char head;
|
unsigned char tail;
|
struct input_event buff[UINPUT_BUFFER_SIZE];
|
unsigned int ff_effects_max;
|
|
struct uinput_request *requests[UINPUT_NUM_REQUESTS];
|
wait_queue_head_t requests_waitq;
|
spinlock_t requests_lock;
|
};
|
|
static int uinput_dev_event(struct input_dev *dev,
|
unsigned int type, unsigned int code, int value)
|
{
|
struct uinput_device *udev = input_get_drvdata(dev);
|
struct timespec64 ts;
|
|
ktime_get_ts64(&ts);
|
|
udev->buff[udev->head] = (struct input_event) {
|
.input_event_sec = ts.tv_sec,
|
.input_event_usec = ts.tv_nsec / NSEC_PER_USEC,
|
.type = type,
|
.code = code,
|
.value = value,
|
};
|
|
udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
|
|
wake_up_interruptible(&udev->waitq);
|
|
return 0;
|
}
|
|
/* Atomically allocate an ID for the given request. Returns 0 on success. */
|
static bool uinput_request_alloc_id(struct uinput_device *udev,
|
struct uinput_request *request)
|
{
|
unsigned int id;
|
bool reserved = false;
|
|
spin_lock(&udev->requests_lock);
|
|
for (id = 0; id < UINPUT_NUM_REQUESTS; id++) {
|
if (!udev->requests[id]) {
|
request->id = id;
|
udev->requests[id] = request;
|
reserved = true;
|
break;
|
}
|
}
|
|
spin_unlock(&udev->requests_lock);
|
return reserved;
|
}
|
|
static struct uinput_request *uinput_request_find(struct uinput_device *udev,
|
unsigned int id)
|
{
|
/* Find an input request, by ID. Returns NULL if the ID isn't valid. */
|
if (id >= UINPUT_NUM_REQUESTS)
|
return NULL;
|
|
return udev->requests[id];
|
}
|
|
static 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_release_slot(struct uinput_device *udev,
|
unsigned int id)
|
{
|
/* Mark slot as available */
|
spin_lock(&udev->requests_lock);
|
udev->requests[id] = NULL;
|
spin_unlock(&udev->requests_lock);
|
|
wake_up(&udev->requests_waitq);
|
}
|
|
static int uinput_request_send(struct uinput_device *udev,
|
struct uinput_request *request)
|
{
|
int retval;
|
|
retval = mutex_lock_interruptible(&udev->mutex);
|
if (retval)
|
return retval;
|
|
if (udev->state != UIST_CREATED) {
|
retval = -ENODEV;
|
goto out;
|
}
|
|
init_completion(&request->done);
|
|
/*
|
* Tell our userspace application about this new request
|
* by queueing an input event.
|
*/
|
uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id);
|
|
out:
|
mutex_unlock(&udev->mutex);
|
return retval;
|
}
|
|
static int uinput_request_submit(struct uinput_device *udev,
|
struct uinput_request *request)
|
{
|
int retval;
|
|
retval = uinput_request_reserve_slot(udev, request);
|
if (retval)
|
return retval;
|
|
retval = uinput_request_send(udev, request);
|
if (retval)
|
goto out;
|
|
if (!wait_for_completion_timeout(&request->done, 30 * HZ)) {
|
retval = -ETIMEDOUT;
|
goto out;
|
}
|
|
retval = request->retval;
|
|
out:
|
uinput_request_release_slot(udev, request->id);
|
return retval;
|
}
|
|
/*
|
* Fail all outstanding requests so handlers don't wait for the userspace
|
* to finish processing them.
|
*/
|
static void uinput_flush_requests(struct uinput_device *udev)
|
{
|
struct uinput_request *request;
|
int i;
|
|
spin_lock(&udev->requests_lock);
|
|
for (i = 0; i < UINPUT_NUM_REQUESTS; i++) {
|
request = udev->requests[i];
|
if (request) {
|
request->retval = -ENODEV;
|
complete(&request->done);
|
}
|
}
|
|
spin_unlock(&udev->requests_lock);
|
}
|
|
static void uinput_dev_set_gain(struct input_dev *dev, u16 gain)
|
{
|
uinput_dev_event(dev, EV_FF, FF_GAIN, gain);
|
}
|
|
static void uinput_dev_set_autocenter(struct input_dev *dev, u16 magnitude)
|
{
|
uinput_dev_event(dev, EV_FF, FF_AUTOCENTER, magnitude);
|
}
|
|
static int uinput_dev_playback(struct input_dev *dev, int effect_id, int value)
|
{
|
return uinput_dev_event(dev, EV_FF, effect_id, value);
|
}
|
|
static int uinput_dev_upload_effect(struct input_dev *dev,
|
struct ff_effect *effect,
|
struct ff_effect *old)
|
{
|
struct uinput_device *udev = input_get_drvdata(dev);
|
struct uinput_request request;
|
|
/*
|
* uinput driver does not currently support periodic effects with
|
* custom waveform since it does not have a way to pass buffer of
|
* samples (custom_data) to userspace. If ever there is a device
|
* supporting custom waveforms we would need to define an additional
|
* ioctl (UI_UPLOAD_SAMPLES) but for now we just bail out.
|
*/
|
if (effect->type == FF_PERIODIC &&
|
effect->u.periodic.waveform == FF_CUSTOM)
|
return -EINVAL;
|
|
request.code = UI_FF_UPLOAD;
|
request.u.upload.effect = effect;
|
request.u.upload.old = old;
|
|
return uinput_request_submit(udev, &request);
|
}
|
|
static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
|
{
|
struct uinput_device *udev = input_get_drvdata(dev);
|
struct uinput_request request;
|
|
if (!test_bit(EV_FF, dev->evbit))
|
return -ENOSYS;
|
|
request.code = UI_FF_ERASE;
|
request.u.effect_id = effect_id;
|
|
return uinput_request_submit(udev, &request);
|
}
|
|
static int uinput_dev_flush(struct input_dev *dev, struct file *file)
|
{
|
/*
|
* If we are called with file == NULL that means we are tearing
|
* down the device, and therefore we can not handle FF erase
|
* requests: either we are handling UI_DEV_DESTROY (and holding
|
* the udev->mutex), or the file descriptor is closed and there is
|
* nobody on the other side anymore.
|
*/
|
return file ? input_ff_flush(dev, file) : 0;
|
}
|
|
static void uinput_destroy_device(struct uinput_device *udev)
|
{
|
const char *name, *phys;
|
struct input_dev *dev = udev->dev;
|
enum uinput_state old_state = udev->state;
|
|
udev->state = UIST_NEW_DEVICE;
|
|
if (dev) {
|
name = dev->name;
|
phys = dev->phys;
|
if (old_state == UIST_CREATED) {
|
uinput_flush_requests(udev);
|
input_unregister_device(dev);
|
} else {
|
input_free_device(dev);
|
}
|
kfree(name);
|
kfree(phys);
|
udev->dev = NULL;
|
}
|
}
|
|
static int uinput_create_device(struct uinput_device *udev)
|
{
|
struct input_dev *dev = udev->dev;
|
int error, nslot;
|
|
if (udev->state != UIST_SETUP_COMPLETE) {
|
printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
|
return -EINVAL;
|
}
|
|
if (test_bit(EV_ABS, dev->evbit)) {
|
input_alloc_absinfo(dev);
|
if (!dev->absinfo) {
|
error = -EINVAL;
|
goto fail1;
|
}
|
|
if (test_bit(ABS_MT_SLOT, dev->absbit)) {
|
nslot = input_abs_get_max(dev, ABS_MT_SLOT) + 1;
|
error = input_mt_init_slots(dev, nslot, 0);
|
if (error)
|
goto fail1;
|
} else if (test_bit(ABS_MT_POSITION_X, dev->absbit)) {
|
input_set_events_per_packet(dev, 60);
|
}
|
}
|
|
if (test_bit(EV_FF, dev->evbit) && !udev->ff_effects_max) {
|
printk(KERN_DEBUG "%s: ff_effects_max should be non-zero when FF_BIT is set\n",
|
UINPUT_NAME);
|
error = -EINVAL;
|
goto fail1;
|
}
|
|
if (udev->ff_effects_max) {
|
error = input_ff_create(dev, udev->ff_effects_max);
|
if (error)
|
goto fail1;
|
|
dev->ff->upload = uinput_dev_upload_effect;
|
dev->ff->erase = uinput_dev_erase_effect;
|
dev->ff->playback = uinput_dev_playback;
|
dev->ff->set_gain = uinput_dev_set_gain;
|
dev->ff->set_autocenter = uinput_dev_set_autocenter;
|
/*
|
* The standard input_ff_flush() implementation does
|
* not quite work for uinput as we can't reasonably
|
* handle FF requests during device teardown.
|
*/
|
dev->flush = uinput_dev_flush;
|
}
|
|
dev->event = uinput_dev_event;
|
|
input_set_drvdata(udev->dev, udev);
|
|
error = input_register_device(udev->dev);
|
if (error)
|
goto fail2;
|
|
udev->state = UIST_CREATED;
|
|
return 0;
|
|
fail2: input_ff_destroy(dev);
|
fail1: uinput_destroy_device(udev);
|
return error;
|
}
|
|
static int uinput_open(struct inode *inode, struct file *file)
|
{
|
struct uinput_device *newdev;
|
|
newdev = kzalloc(sizeof(struct uinput_device), GFP_KERNEL);
|
if (!newdev)
|
return -ENOMEM;
|
|
mutex_init(&newdev->mutex);
|
spin_lock_init(&newdev->requests_lock);
|
init_waitqueue_head(&newdev->requests_waitq);
|
init_waitqueue_head(&newdev->waitq);
|
newdev->state = UIST_NEW_DEVICE;
|
|
file->private_data = newdev;
|
stream_open(inode, file);
|
|
return 0;
|
}
|
|
static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code,
|
const struct input_absinfo *abs)
|
{
|
int min, max, range;
|
|
min = abs->minimum;
|
max = abs->maximum;
|
|
if ((min != 0 || max != 0) && max < min) {
|
printk(KERN_DEBUG
|
"%s: invalid abs[%02x] min:%d max:%d\n",
|
UINPUT_NAME, code, min, max);
|
return -EINVAL;
|
}
|
|
if (!check_sub_overflow(max, min, &range) && abs->flat > range) {
|
printk(KERN_DEBUG
|
"%s: abs_flat #%02x out of range: %d (min:%d/max:%d)\n",
|
UINPUT_NAME, code, abs->flat, min, max);
|
return -EINVAL;
|
}
|
|
return 0;
|
}
|
|
static int uinput_validate_absbits(struct input_dev *dev)
|
{
|
unsigned int cnt;
|
int error;
|
|
if (!test_bit(EV_ABS, dev->evbit))
|
return 0;
|
|
/*
|
* Check if absmin/absmax/absfuzz/absflat are sane.
|
*/
|
|
for_each_set_bit(cnt, dev->absbit, ABS_CNT) {
|
if (!dev->absinfo)
|
return -EINVAL;
|
|
error = uinput_validate_absinfo(dev, cnt, &dev->absinfo[cnt]);
|
if (error)
|
return error;
|
}
|
|
return 0;
|
}
|
|
static int uinput_dev_setup(struct uinput_device *udev,
|
struct uinput_setup __user *arg)
|
{
|
struct uinput_setup setup;
|
struct input_dev *dev;
|
|
if (udev->state == UIST_CREATED)
|
return -EINVAL;
|
|
if (copy_from_user(&setup, arg, sizeof(setup)))
|
return -EFAULT;
|
|
if (!setup.name[0])
|
return -EINVAL;
|
|
dev = udev->dev;
|
dev->id = setup.id;
|
udev->ff_effects_max = setup.ff_effects_max;
|
|
kfree(dev->name);
|
dev->name = kstrndup(setup.name, UINPUT_MAX_NAME_SIZE, GFP_KERNEL);
|
if (!dev->name)
|
return -ENOMEM;
|
|
udev->state = UIST_SETUP_COMPLETE;
|
return 0;
|
}
|
|
static int uinput_abs_setup(struct uinput_device *udev,
|
struct uinput_setup __user *arg, size_t size)
|
{
|
struct uinput_abs_setup setup = {};
|
struct input_dev *dev;
|
int error;
|
|
if (size > sizeof(setup))
|
return -E2BIG;
|
|
if (udev->state == UIST_CREATED)
|
return -EINVAL;
|
|
if (copy_from_user(&setup, arg, size))
|
return -EFAULT;
|
|
if (setup.code > ABS_MAX)
|
return -ERANGE;
|
|
dev = udev->dev;
|
|
error = uinput_validate_absinfo(dev, setup.code, &setup.absinfo);
|
if (error)
|
return error;
|
|
input_alloc_absinfo(dev);
|
if (!dev->absinfo)
|
return -ENOMEM;
|
|
set_bit(setup.code, dev->absbit);
|
dev->absinfo[setup.code] = setup.absinfo;
|
return 0;
|
}
|
|
/* legacy setup via write() */
|
static int uinput_setup_device_legacy(struct uinput_device *udev,
|
const char __user *buffer, size_t count)
|
{
|
struct uinput_user_dev *user_dev;
|
struct input_dev *dev;
|
int i;
|
int retval;
|
|
if (count != sizeof(struct uinput_user_dev))
|
return -EINVAL;
|
|
if (!udev->dev) {
|
udev->dev = input_allocate_device();
|
if (!udev->dev)
|
return -ENOMEM;
|
}
|
|
dev = udev->dev;
|
|
user_dev = memdup_user(buffer, sizeof(struct uinput_user_dev));
|
if (IS_ERR(user_dev))
|
return PTR_ERR(user_dev);
|
|
udev->ff_effects_max = user_dev->ff_effects_max;
|
|
/* Ensure name is filled in */
|
if (!user_dev->name[0]) {
|
retval = -EINVAL;
|
goto exit;
|
}
|
|
kfree(dev->name);
|
dev->name = kstrndup(user_dev->name, UINPUT_MAX_NAME_SIZE,
|
GFP_KERNEL);
|
if (!dev->name) {
|
retval = -ENOMEM;
|
goto exit;
|
}
|
|
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;
|
|
for (i = 0; i < ABS_CNT; i++) {
|
input_abs_set_max(dev, i, user_dev->absmax[i]);
|
input_abs_set_min(dev, i, user_dev->absmin[i]);
|
input_abs_set_fuzz(dev, i, user_dev->absfuzz[i]);
|
input_abs_set_flat(dev, i, user_dev->absflat[i]);
|
}
|
|
retval = uinput_validate_absbits(dev);
|
if (retval < 0)
|
goto exit;
|
|
udev->state = UIST_SETUP_COMPLETE;
|
retval = count;
|
|
exit:
|
kfree(user_dev);
|
return retval;
|
}
|
|
static ssize_t uinput_inject_events(struct uinput_device *udev,
|
const char __user *buffer, size_t count)
|
{
|
struct input_event ev;
|
size_t bytes = 0;
|
|
if (count != 0 && count < input_event_size())
|
return -EINVAL;
|
|
while (bytes + input_event_size() <= count) {
|
/*
|
* Note that even if some events were fetched successfully
|
* we are still going to return EFAULT instead of partial
|
* count to let userspace know that it got it's buffers
|
* all wrong.
|
*/
|
if (input_event_from_user(buffer + bytes, &ev))
|
return -EFAULT;
|
|
input_event(udev->dev, ev.type, ev.code, ev.value);
|
bytes += input_event_size();
|
cond_resched();
|
}
|
|
return bytes;
|
}
|
|
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;
|
int retval;
|
|
if (count == 0)
|
return 0;
|
|
retval = mutex_lock_interruptible(&udev->mutex);
|
if (retval)
|
return retval;
|
|
retval = udev->state == UIST_CREATED ?
|
uinput_inject_events(udev, buffer, count) :
|
uinput_setup_device_legacy(udev, buffer, count);
|
|
mutex_unlock(&udev->mutex);
|
|
return retval;
|
}
|
|
static bool uinput_fetch_next_event(struct uinput_device *udev,
|
struct input_event *event)
|
{
|
bool have_event;
|
|
spin_lock_irq(&udev->dev->event_lock);
|
|
have_event = udev->head != udev->tail;
|
if (have_event) {
|
*event = udev->buff[udev->tail];
|
udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
|
}
|
|
spin_unlock_irq(&udev->dev->event_lock);
|
|
return have_event;
|
}
|
|
static ssize_t uinput_events_to_user(struct uinput_device *udev,
|
char __user *buffer, size_t count)
|
{
|
struct input_event event;
|
size_t read = 0;
|
|
while (read + input_event_size() <= count &&
|
uinput_fetch_next_event(udev, &event)) {
|
|
if (input_event_to_user(buffer + read, &event))
|
return -EFAULT;
|
|
read += input_event_size();
|
}
|
|
return read;
|
}
|
|
static ssize_t uinput_read(struct file *file, char __user *buffer,
|
size_t count, loff_t *ppos)
|
{
|
struct uinput_device *udev = file->private_data;
|
ssize_t retval;
|
|
if (count != 0 && count < input_event_size())
|
return -EINVAL;
|
|
do {
|
retval = mutex_lock_interruptible(&udev->mutex);
|
if (retval)
|
return retval;
|
|
if (udev->state != UIST_CREATED)
|
retval = -ENODEV;
|
else if (udev->head == udev->tail &&
|
(file->f_flags & O_NONBLOCK))
|
retval = -EAGAIN;
|
else
|
retval = uinput_events_to_user(udev, buffer, count);
|
|
mutex_unlock(&udev->mutex);
|
|
if (retval || count == 0)
|
break;
|
|
if (!(file->f_flags & O_NONBLOCK))
|
retval = wait_event_interruptible(udev->waitq,
|
udev->head != udev->tail ||
|
udev->state != UIST_CREATED);
|
} while (retval == 0);
|
|
return retval;
|
}
|
|
static __poll_t uinput_poll(struct file *file, poll_table *wait)
|
{
|
struct uinput_device *udev = file->private_data;
|
__poll_t mask = EPOLLOUT | EPOLLWRNORM; /* uinput is always writable */
|
|
poll_wait(file, &udev->waitq, wait);
|
|
if (udev->head != udev->tail)
|
mask |= EPOLLIN | EPOLLRDNORM;
|
|
return mask;
|
}
|
|
static int uinput_release(struct inode *inode, struct file *file)
|
{
|
struct uinput_device *udev = file->private_data;
|
|
uinput_destroy_device(udev);
|
kfree(udev);
|
|
return 0;
|
}
|
|
#ifdef CONFIG_COMPAT
|
struct uinput_ff_upload_compat {
|
__u32 request_id;
|
__s32 retval;
|
struct ff_effect_compat effect;
|
struct ff_effect_compat old;
|
};
|
|
static int uinput_ff_upload_to_user(char __user *buffer,
|
const struct uinput_ff_upload *ff_up)
|
{
|
if (in_compat_syscall()) {
|
struct uinput_ff_upload_compat ff_up_compat;
|
|
ff_up_compat.request_id = ff_up->request_id;
|
ff_up_compat.retval = ff_up->retval;
|
/*
|
* It so happens that the pointer that gives us the trouble
|
* is the last field in the structure. Since we don't support
|
* custom waveforms in uinput anyway we can just copy the whole
|
* thing (to the compat size) and ignore the pointer.
|
*/
|
memcpy(&ff_up_compat.effect, &ff_up->effect,
|
sizeof(struct ff_effect_compat));
|
memcpy(&ff_up_compat.old, &ff_up->old,
|
sizeof(struct ff_effect_compat));
|
|
if (copy_to_user(buffer, &ff_up_compat,
|
sizeof(struct uinput_ff_upload_compat)))
|
return -EFAULT;
|
} else {
|
if (copy_to_user(buffer, ff_up,
|
sizeof(struct uinput_ff_upload)))
|
return -EFAULT;
|
}
|
|
return 0;
|
}
|
|
static int uinput_ff_upload_from_user(const char __user *buffer,
|
struct uinput_ff_upload *ff_up)
|
{
|
if (in_compat_syscall()) {
|
struct uinput_ff_upload_compat ff_up_compat;
|
|
if (copy_from_user(&ff_up_compat, buffer,
|
sizeof(struct uinput_ff_upload_compat)))
|
return -EFAULT;
|
|
ff_up->request_id = ff_up_compat.request_id;
|
ff_up->retval = ff_up_compat.retval;
|
memcpy(&ff_up->effect, &ff_up_compat.effect,
|
sizeof(struct ff_effect_compat));
|
memcpy(&ff_up->old, &ff_up_compat.old,
|
sizeof(struct ff_effect_compat));
|
|
} else {
|
if (copy_from_user(ff_up, buffer,
|
sizeof(struct uinput_ff_upload)))
|
return -EFAULT;
|
}
|
|
return 0;
|
}
|
|
#else
|
|
static int uinput_ff_upload_to_user(char __user *buffer,
|
const struct uinput_ff_upload *ff_up)
|
{
|
if (copy_to_user(buffer, ff_up, sizeof(struct uinput_ff_upload)))
|
return -EFAULT;
|
|
return 0;
|
}
|
|
static int uinput_ff_upload_from_user(const char __user *buffer,
|
struct uinput_ff_upload *ff_up)
|
{
|
if (copy_from_user(ff_up, buffer, sizeof(struct uinput_ff_upload)))
|
return -EFAULT;
|
|
return 0;
|
}
|
|
#endif
|
|
#define uinput_set_bit(_arg, _bit, _max) \
|
({ \
|
int __ret = 0; \
|
if (udev->state == UIST_CREATED) \
|
__ret = -EINVAL; \
|
else if ((_arg) > (_max)) \
|
__ret = -EINVAL; \
|
else set_bit((_arg), udev->dev->_bit); \
|
__ret; \
|
})
|
|
static int uinput_str_to_user(void __user *dest, const char *str,
|
unsigned int maxlen)
|
{
|
char __user *p = dest;
|
int len, ret;
|
|
if (!str)
|
return -ENOENT;
|
|
if (maxlen == 0)
|
return -EINVAL;
|
|
len = strlen(str) + 1;
|
if (len > maxlen)
|
len = maxlen;
|
|
ret = copy_to_user(p, str, len);
|
if (ret)
|
return -EFAULT;
|
|
/* force terminating '\0' */
|
ret = put_user(0, p + len - 1);
|
return ret ? -EFAULT : len;
|
}
|
|
static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
|
unsigned long arg, void __user *p)
|
{
|
int retval;
|
struct uinput_device *udev = file->private_data;
|
struct uinput_ff_upload ff_up;
|
struct uinput_ff_erase ff_erase;
|
struct uinput_request *req;
|
char *phys;
|
const char *name;
|
unsigned int size;
|
|
retval = mutex_lock_interruptible(&udev->mutex);
|
if (retval)
|
return retval;
|
|
if (!udev->dev) {
|
udev->dev = input_allocate_device();
|
if (!udev->dev) {
|
retval = -ENOMEM;
|
goto out;
|
}
|
}
|
|
switch (cmd) {
|
case UI_GET_VERSION:
|
if (put_user(UINPUT_VERSION, (unsigned int __user *)p))
|
retval = -EFAULT;
|
goto out;
|
|
case UI_DEV_CREATE:
|
retval = uinput_create_device(udev);
|
goto out;
|
|
case UI_DEV_DESTROY:
|
uinput_destroy_device(udev);
|
goto out;
|
|
case UI_DEV_SETUP:
|
retval = uinput_dev_setup(udev, p);
|
goto out;
|
|
/* UI_ABS_SETUP is handled in the variable size ioctls */
|
|
case UI_SET_EVBIT:
|
retval = uinput_set_bit(arg, evbit, EV_MAX);
|
goto out;
|
|
case UI_SET_KEYBIT:
|
retval = uinput_set_bit(arg, keybit, KEY_MAX);
|
goto out;
|
|
case UI_SET_RELBIT:
|
retval = uinput_set_bit(arg, relbit, REL_MAX);
|
goto out;
|
|
case UI_SET_ABSBIT:
|
retval = uinput_set_bit(arg, absbit, ABS_MAX);
|
goto out;
|
|
case UI_SET_MSCBIT:
|
retval = uinput_set_bit(arg, mscbit, MSC_MAX);
|
goto out;
|
|
case UI_SET_LEDBIT:
|
retval = uinput_set_bit(arg, ledbit, LED_MAX);
|
goto out;
|
|
case UI_SET_SNDBIT:
|
retval = uinput_set_bit(arg, sndbit, SND_MAX);
|
goto out;
|
|
case UI_SET_FFBIT:
|
retval = uinput_set_bit(arg, ffbit, FF_MAX);
|
goto out;
|
|
case UI_SET_SWBIT:
|
retval = uinput_set_bit(arg, swbit, SW_MAX);
|
goto out;
|
|
case UI_SET_PROPBIT:
|
retval = uinput_set_bit(arg, propbit, INPUT_PROP_MAX);
|
goto out;
|
|
case UI_SET_PHYS:
|
if (udev->state == UIST_CREATED) {
|
retval = -EINVAL;
|
goto out;
|
}
|
|
phys = strndup_user(p, 1024);
|
if (IS_ERR(phys)) {
|
retval = PTR_ERR(phys);
|
goto out;
|
}
|
|
kfree(udev->dev->phys);
|
udev->dev->phys = phys;
|
goto out;
|
|
case UI_BEGIN_FF_UPLOAD:
|
retval = uinput_ff_upload_from_user(p, &ff_up);
|
if (retval)
|
goto out;
|
|
req = uinput_request_find(udev, ff_up.request_id);
|
if (!req || req->code != UI_FF_UPLOAD ||
|
!req->u.upload.effect) {
|
retval = -EINVAL;
|
goto out;
|
}
|
|
ff_up.retval = 0;
|
ff_up.effect = *req->u.upload.effect;
|
if (req->u.upload.old)
|
ff_up.old = *req->u.upload.old;
|
else
|
memset(&ff_up.old, 0, sizeof(struct ff_effect));
|
|
retval = uinput_ff_upload_to_user(p, &ff_up);
|
goto out;
|
|
case UI_BEGIN_FF_ERASE:
|
if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
|
retval = -EFAULT;
|
goto out;
|
}
|
|
req = uinput_request_find(udev, ff_erase.request_id);
|
if (!req || req->code != UI_FF_ERASE) {
|
retval = -EINVAL;
|
goto out;
|
}
|
|
ff_erase.retval = 0;
|
ff_erase.effect_id = req->u.effect_id;
|
if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
|
retval = -EFAULT;
|
goto out;
|
}
|
|
goto out;
|
|
case UI_END_FF_UPLOAD:
|
retval = uinput_ff_upload_from_user(p, &ff_up);
|
if (retval)
|
goto out;
|
|
req = uinput_request_find(udev, ff_up.request_id);
|
if (!req || req->code != UI_FF_UPLOAD ||
|
!req->u.upload.effect) {
|
retval = -EINVAL;
|
goto out;
|
}
|
|
req->retval = ff_up.retval;
|
complete(&req->done);
|
goto out;
|
|
case UI_END_FF_ERASE:
|
if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
|
retval = -EFAULT;
|
goto out;
|
}
|
|
req = uinput_request_find(udev, ff_erase.request_id);
|
if (!req || req->code != UI_FF_ERASE) {
|
retval = -EINVAL;
|
goto out;
|
}
|
|
req->retval = ff_erase.retval;
|
complete(&req->done);
|
goto out;
|
}
|
|
size = _IOC_SIZE(cmd);
|
|
/* Now check variable-length commands */
|
switch (cmd & ~IOCSIZE_MASK) {
|
case UI_GET_SYSNAME(0):
|
if (udev->state != UIST_CREATED) {
|
retval = -ENOENT;
|
goto out;
|
}
|
name = dev_name(&udev->dev->dev);
|
retval = uinput_str_to_user(p, name, size);
|
goto out;
|
|
case UI_ABS_SETUP & ~IOCSIZE_MASK:
|
retval = uinput_abs_setup(udev, p, size);
|
goto out;
|
}
|
|
retval = -EINVAL;
|
out:
|
mutex_unlock(&udev->mutex);
|
return retval;
|
}
|
|
static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
{
|
return uinput_ioctl_handler(file, cmd, arg, (void __user *)arg);
|
}
|
|
#ifdef CONFIG_COMPAT
|
|
/*
|
* These IOCTLs change their size and thus their numbers between
|
* 32 and 64 bits.
|
*/
|
#define UI_SET_PHYS_COMPAT \
|
_IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t)
|
#define UI_BEGIN_FF_UPLOAD_COMPAT \
|
_IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload_compat)
|
#define UI_END_FF_UPLOAD_COMPAT \
|
_IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload_compat)
|
|
static long uinput_compat_ioctl(struct file *file,
|
unsigned int cmd, unsigned long arg)
|
{
|
switch (cmd) {
|
case UI_SET_PHYS_COMPAT:
|
cmd = UI_SET_PHYS;
|
break;
|
case UI_BEGIN_FF_UPLOAD_COMPAT:
|
cmd = UI_BEGIN_FF_UPLOAD;
|
break;
|
case UI_END_FF_UPLOAD_COMPAT:
|
cmd = UI_END_FF_UPLOAD;
|
break;
|
}
|
|
return uinput_ioctl_handler(file, cmd, arg, compat_ptr(arg));
|
}
|
#endif
|
|
static const struct file_operations uinput_fops = {
|
.owner = THIS_MODULE,
|
.open = uinput_open,
|
.release = uinput_release,
|
.read = uinput_read,
|
.write = uinput_write,
|
.poll = uinput_poll,
|
.unlocked_ioctl = uinput_ioctl,
|
#ifdef CONFIG_COMPAT
|
.compat_ioctl = uinput_compat_ioctl,
|
#endif
|
.llseek = no_llseek,
|
};
|
|
static struct miscdevice uinput_misc = {
|
.fops = &uinput_fops,
|
.minor = UINPUT_MINOR,
|
.name = UINPUT_NAME,
|
};
|
module_misc_device(uinput_misc);
|
|
MODULE_ALIAS_MISCDEV(UINPUT_MINOR);
|
MODULE_ALIAS("devname:" UINPUT_NAME);
|
|
MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
|
MODULE_DESCRIPTION("User level driver support for input subsystem");
|
MODULE_LICENSE("GPL");
|
