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