v4.19.13 snapshot.
diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
new file mode 100644
index 0000000..8ec483e
--- /dev/null
+++ b/drivers/input/misc/uinput.c
@@ -0,0 +1,1091 @@
+/*
+ * 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:
+ * 0.4 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/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;
+
+ udev->buff[udev->head].type = type;
+ udev->buff[udev->head].code = code;
+ udev->buff[udev->head].value = value;
+ ktime_get_ts64(&ts);
+ udev->buff[udev->head].input_event_sec = ts.tv_sec;
+ udev->buff[udev->head].input_event_usec = ts.tv_nsec / NSEC_PER_USEC;
+ 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;
+ nonseekable_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;
+
+ 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 (abs->flat > max - min) {
+ 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_wait(file, &udev->waitq, wait);
+
+ if (udev->head != udev->tail)
+ return EPOLLIN | EPOLLRDNORM;
+
+ return 0;
+}
+
+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
+
+#define UI_SET_PHYS_COMPAT _IOW(UINPUT_IOCTL_BASE, 108, compat_uptr_t)
+
+static long uinput_compat_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ if (cmd == UI_SET_PHYS_COMPAT)
+ cmd = UI_SET_PHYS;
+
+ 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");