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-rw-r--r--drivers/input/misc/uinput.c662
1 files changed, 662 insertions, 0 deletions
diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
new file mode 100644
index 0000000..223d56d
--- /dev/null
+++ b/drivers/input/misc/uinput.c
@@ -0,0 +1,662 @@
+/*
+ * 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:
+ * 0.3 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 <linux/poll.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/init.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 = input_get_drvdata(dev);
+
+ 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)
+{
+ /* Mark slot as available */
+ udev->requests[request->id] = NULL;
+ wake_up(&udev->requests_waitq);
+
+ complete(&request->done);
+}
+
+static int uinput_request_submit(struct input_dev *dev, struct uinput_request *request)
+{
+ /* 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 */
+ wait_for_completion(&request->done);
+ return request->retval;
+}
+
+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_request request;
+ int retval;
+
+ request.id = -1;
+ init_completion(&request.done);
+ request.code = UI_FF_UPLOAD;
+ request.u.upload.effect = effect;
+ request.u.upload.old = old;
+
+ retval = uinput_request_reserve_slot(input_get_drvdata(dev), &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(input_get_drvdata(dev), &request);
+ if (!retval)
+ retval = uinput_request_submit(dev, &request);
+
+ return retval;
+}
+
+static void uinput_destroy_device(struct uinput_device *udev)
+{
+ const char *name, *phys;
+
+ if (udev->dev) {
+ name = udev->dev->name;
+ phys = udev->dev->phys;
+ if (udev->state == UIST_CREATED)
+ input_unregister_device(udev->dev);
+ else
+ input_free_device(udev->dev);
+ kfree(name);
+ kfree(phys);
+ udev->dev = NULL;
+ }
+
+ udev->state = UIST_NEW_DEVICE;
+}
+
+static int uinput_create_device(struct uinput_device *udev)
+{
+ struct input_dev *dev = udev->dev;
+ int error;
+
+ if (udev->state != UIST_SETUP_COMPLETE) {
+ printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
+ return -EINVAL;
+ }
+
+ 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;
+ }
+
+ 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;
+
+ lock_kernel();
+ 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;
+ unlock_kernel();
+
+ return 0;
+}
+
+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_allocate_device(struct uinput_device *udev)
+{
+ udev->dev = input_allocate_device();
+ if (!udev->dev)
+ return -ENOMEM;
+
+ udev->dev->event = uinput_dev_event;
+ input_set_drvdata(udev->dev, udev);
+
+ return 0;
+}
+
+static int uinput_setup_device(struct uinput_device *udev, const char __user *buffer, size_t count)
+{
+ struct uinput_user_dev *user_dev;
+ struct input_dev *dev;
+ char *name;
+ int size;
+ int retval;
+
+ if (count != sizeof(struct uinput_user_dev))
+ return -EINVAL;
+
+ if (!udev->dev) {
+ retval = uinput_allocate_device(udev);
+ if (retval)
+ return retval;
+ }
+
+ dev = udev->dev;
+
+ user_dev = kmalloc(sizeof(struct uinput_user_dev), GFP_KERNEL);
+ if (!user_dev)
+ return -ENOMEM;
+
+ if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) {
+ retval = -EFAULT;
+ goto exit;
+ }
+
+ udev->ff_effects_max = user_dev->ff_effects_max;
+
+ size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1;
+ if (!size) {
+ retval = -EINVAL;
+ goto exit;
+ }
+
+ kfree(dev->name);
+ 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;
+
+ 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)) {
+ retval = uinput_validate_absbits(dev);
+ if (retval < 0)
+ goto exit;
+ }
+
+ udev->state = UIST_SETUP_COMPLETE;
+ retval = count;
+
+ exit:
+ kfree(user_dev);
+ return retval;
+}
+
+static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char __user *buffer, size_t count)
+{
+ struct input_event ev;
+
+ if (count != sizeof(struct input_event))
+ return -EINVAL;
+
+ if (copy_from_user(&ev, buffer, sizeof(struct input_event)))
+ return -EFAULT;
+
+ input_event(udev->dev, ev.type, ev.code, ev.value);
+
+ return sizeof(struct input_event);
+}
+
+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;
+
+ retval = mutex_lock_interruptible(&udev->mutex);
+ if (retval)
+ return retval;
+
+ retval = udev->state == UIST_CREATED ?
+ uinput_inject_event(udev, buffer, count) :
+ uinput_setup_device(udev, buffer, count);
+
+ mutex_unlock(&udev->mutex);
+
+ return retval;
+}
+
+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 (udev->state != UIST_CREATED)
+ return -ENODEV;
+
+ if (udev->head == udev->tail && (file->f_flags & O_NONBLOCK))
+ return -EAGAIN;
+
+ retval = wait_event_interruptible(udev->waitq,
+ udev->head != udev->tail || udev->state != UIST_CREATED);
+ if (retval)
+ return retval;
+
+ retval = mutex_lock_interruptible(&udev->mutex);
+ if (retval)
+ return retval;
+
+ if (udev->state != UIST_CREATED) {
+ retval = -ENODEV;
+ goto out;
+ }
+
+ 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))) {
+ retval = -EFAULT;
+ goto out;
+ }
+ udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
+ retval += sizeof(struct input_event);
+ }
+
+ out:
+ mutex_unlock(&udev->mutex);
+
+ 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_release(struct inode *inode, struct file *file)
+{
+ struct uinput_device *udev = file->private_data;
+
+ uinput_destroy_device(udev);
+ kfree(udev);
+
+ return 0;
+}
+
+#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 long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ int retval;
+ 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;
+
+ retval = mutex_lock_interruptible(&udev->mutex);
+ if (retval)
+ return retval;
+
+ if (!udev->dev) {
+ retval = uinput_allocate_device(udev);
+ if (retval)
+ goto out;
+ }
+
+ switch (cmd) {
+ case UI_DEV_CREATE:
+ retval = uinput_create_device(udev);
+ break;
+
+ case UI_DEV_DESTROY:
+ uinput_destroy_device(udev);
+ break;
+
+ case UI_SET_EVBIT:
+ retval = uinput_set_bit(arg, evbit, EV_MAX);
+ break;
+
+ case UI_SET_KEYBIT:
+ retval = uinput_set_bit(arg, keybit, KEY_MAX);
+ break;
+
+ case UI_SET_RELBIT:
+ retval = uinput_set_bit(arg, relbit, REL_MAX);
+ break;
+
+ case UI_SET_ABSBIT:
+ retval = uinput_set_bit(arg, absbit, ABS_MAX);
+ break;
+
+ case UI_SET_MSCBIT:
+ retval = uinput_set_bit(arg, mscbit, MSC_MAX);
+ break;
+
+ case UI_SET_LEDBIT:
+ retval = uinput_set_bit(arg, ledbit, LED_MAX);
+ break;
+
+ case UI_SET_SNDBIT:
+ retval = uinput_set_bit(arg, sndbit, SND_MAX);
+ break;
+
+ case UI_SET_FFBIT:
+ retval = uinput_set_bit(arg, ffbit, FF_MAX);
+ break;
+
+ case UI_SET_SWBIT:
+ retval = uinput_set_bit(arg, swbit, SW_MAX);
+ break;
+
+ case UI_SET_PHYS:
+ if (udev->state == UIST_CREATED) {
+ retval = -EINVAL;
+ goto out;
+ }
+ 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.upload.effect)) {
+ retval = -EINVAL;
+ break;
+ }
+ ff_up.retval = 0;
+ memcpy(&ff_up.effect, req->u.upload.effect, sizeof(struct ff_effect));
+ if (req->u.upload.old)
+ memcpy(&ff_up.old, req->u.upload.old, sizeof(struct ff_effect));
+ else
+ memset(&ff_up.old, 0, 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.upload.effect)) {
+ retval = -EINVAL;
+ break;
+ }
+ req->retval = ff_up.retval;
+ 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;
+ }
+
+ out:
+ mutex_unlock(&udev->mutex);
+ return retval;
+}
+
+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,
+};
+
+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_VERSION("0.3");
+
+module_init(uinput_init);
+module_exit(uinput_exit);
+
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