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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/input/misc/uinput.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/input/misc/uinput.c')
-rw-r--r--drivers/input/misc/uinput.c620
1 files changed, 620 insertions, 0 deletions
diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
new file mode 100644
index 00000000000..158c8e845ff
--- /dev/null
+++ b/drivers/input/misc/uinput.c
@@ -0,0 +1,620 @@
+/*
+ * User level driver support for input subsystem
+ *
+ * Heavily based on evdev.c by Vojtech Pavlik
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
+ *
+ * Changes/Revisions:
+ * 0.2 16/10/2004 (Micah Dowty <micah@navi.cx>)
+ * - added force feedback support
+ * - added UI_SET_PHYS
+ * 0.1 20/06/2002
+ * - first public version
+ */
+#include <linux/poll.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/input.h>
+#include <linux/smp_lock.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/uinput.h>
+
+static int uinput_dev_open(struct input_dev *dev)
+{
+ return 0;
+}
+
+static void uinput_dev_close(struct input_dev *dev)
+{
+
+}
+
+static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
+{
+ struct uinput_device *udev;
+
+ udev = dev->private;
+
+ udev->buff[udev->head].type = type;
+ udev->buff[udev->head].code = code;
+ udev->buff[udev->head].value = value;
+ do_gettimeofday(&udev->buff[udev->head].time);
+ udev->head = (udev->head + 1) % UINPUT_BUFFER_SIZE;
+
+ wake_up_interruptible(&udev->waitq);
+
+ return 0;
+}
+
+static int uinput_request_alloc_id(struct input_dev *dev, struct uinput_request *request)
+{
+ /* Atomically allocate an ID for the given request. Returns 0 on success. */
+ struct uinput_device *udev = dev->private;
+ int id;
+
+ down(&udev->requests_sem);
+ for (id=0; id<UINPUT_NUM_REQUESTS; id++)
+ if (!udev->requests[id]) {
+ udev->requests[id] = request;
+ request->id = id;
+ up(&udev->requests_sem);
+ return 0;
+ }
+ up(&udev->requests_sem);
+ return -1;
+}
+
+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;
+ if (udev->requests[id]->completed)
+ return NULL;
+ return udev->requests[id];
+}
+
+static void uinput_request_init(struct input_dev *dev, struct uinput_request *request, int code)
+{
+ struct uinput_device *udev = dev->private;
+
+ memset(request, 0, sizeof(struct uinput_request));
+ request->code = code;
+ init_waitqueue_head(&request->waitq);
+
+ /* Allocate an ID. If none are available right away, wait. */
+ request->retval = wait_event_interruptible(udev->requests_waitq,
+ !uinput_request_alloc_id(dev, request));
+}
+
+static void uinput_request_submit(struct input_dev *dev, struct uinput_request *request)
+{
+ struct uinput_device *udev = dev->private;
+ int retval;
+
+ /* Tell our userspace app about this new request by queueing an input event */
+ uinput_dev_event(dev, EV_UINPUT, request->code, request->id);
+
+ /* Wait for the request to complete */
+ retval = wait_event_interruptible(request->waitq, request->completed);
+ if (retval)
+ request->retval = retval;
+
+ /* Release this request's ID, let others know it's available */
+ udev->requests[request->id] = NULL;
+ wake_up_interruptible(&udev->requests_waitq);
+}
+
+static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect)
+{
+ struct uinput_request request;
+
+ if (!test_bit(EV_FF, dev->evbit))
+ return -ENOSYS;
+
+ uinput_request_init(dev, &request, UI_FF_UPLOAD);
+ if (request.retval)
+ return request.retval;
+ request.u.effect = effect;
+ uinput_request_submit(dev, &request);
+ return request.retval;
+}
+
+static int uinput_dev_erase_effect(struct input_dev *dev, int effect_id)
+{
+ struct uinput_request request;
+
+ if (!test_bit(EV_FF, dev->evbit))
+ return -ENOSYS;
+
+ uinput_request_init(dev, &request, UI_FF_ERASE);
+ if (request.retval)
+ return request.retval;
+ request.u.effect_id = effect_id;
+ uinput_request_submit(dev, &request);
+ return request.retval;
+}
+
+static int uinput_create_device(struct uinput_device *udev)
+{
+ if (!udev->dev->name) {
+ printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
+ return -EINVAL;
+ }
+
+ udev->dev->open = uinput_dev_open;
+ udev->dev->close = uinput_dev_close;
+ udev->dev->event = uinput_dev_event;
+ udev->dev->upload_effect = uinput_dev_upload_effect;
+ udev->dev->erase_effect = uinput_dev_erase_effect;
+ udev->dev->private = udev;
+
+ init_waitqueue_head(&(udev->waitq));
+
+ input_register_device(udev->dev);
+
+ set_bit(UIST_CREATED, &(udev->state));
+
+ return 0;
+}
+
+static int uinput_destroy_device(struct uinput_device *udev)
+{
+ if (!test_bit(UIST_CREATED, &(udev->state))) {
+ printk(KERN_WARNING "%s: create the device first\n", UINPUT_NAME);
+ return -EINVAL;
+ }
+
+ input_unregister_device(udev->dev);
+
+ clear_bit(UIST_CREATED, &(udev->state));
+
+ return 0;
+}
+
+static int uinput_open(struct inode *inode, struct file *file)
+{
+ struct uinput_device *newdev;
+ struct input_dev *newinput;
+
+ newdev = kmalloc(sizeof(struct uinput_device), GFP_KERNEL);
+ if (!newdev)
+ goto error;
+ memset(newdev, 0, sizeof(struct uinput_device));
+ init_MUTEX(&newdev->requests_sem);
+ init_waitqueue_head(&newdev->requests_waitq);
+
+ newinput = kmalloc(sizeof(struct input_dev), GFP_KERNEL);
+ if (!newinput)
+ goto cleanup;
+ memset(newinput, 0, sizeof(struct input_dev));
+
+ newdev->dev = newinput;
+
+ file->private_data = newdev;
+
+ return 0;
+cleanup:
+ kfree(newdev);
+error:
+ return -ENOMEM;
+}
+
+static int uinput_validate_absbits(struct input_dev *dev)
+{
+ unsigned int cnt;
+ int retval = 0;
+
+ for (cnt = 0; cnt < ABS_MAX + 1; cnt++) {
+ if (!test_bit(cnt, dev->absbit))
+ continue;
+
+ if ((dev->absmax[cnt] <= dev->absmin[cnt])) {
+ printk(KERN_DEBUG
+ "%s: invalid abs[%02x] min:%d max:%d\n",
+ UINPUT_NAME, cnt,
+ dev->absmin[cnt], dev->absmax[cnt]);
+ retval = -EINVAL;
+ break;
+ }
+
+ if (dev->absflat[cnt] > (dev->absmax[cnt] - dev->absmin[cnt])) {
+ printk(KERN_DEBUG
+ "%s: absflat[%02x] out of range: %d "
+ "(min:%d/max:%d)\n",
+ UINPUT_NAME, cnt, dev->absflat[cnt],
+ dev->absmin[cnt], dev->absmax[cnt]);
+ retval = -EINVAL;
+ break;
+ }
+ }
+ return retval;
+}
+
+static int uinput_alloc_device(struct file *file, const char __user *buffer, size_t count)
+{
+ struct uinput_user_dev *user_dev;
+ struct input_dev *dev;
+ struct uinput_device *udev;
+ int size,
+ retval;
+
+ retval = count;
+
+ udev = file->private_data;
+ dev = udev->dev;
+
+ user_dev = kmalloc(sizeof(*user_dev), GFP_KERNEL);
+ if (!user_dev) {
+ retval = -ENOMEM;
+ goto exit;
+ }
+
+ if (copy_from_user(user_dev, buffer, sizeof(struct uinput_user_dev))) {
+ retval = -EFAULT;
+ goto exit;
+ }
+
+ if (NULL != dev->name)
+ kfree(dev->name);
+
+ size = strnlen(user_dev->name, UINPUT_MAX_NAME_SIZE) + 1;
+ dev->name = kmalloc(size, GFP_KERNEL);
+ if (!dev->name) {
+ retval = -ENOMEM;
+ goto exit;
+ }
+
+ strlcpy(dev->name, user_dev->name, size);
+ dev->id.bustype = user_dev->id.bustype;
+ dev->id.vendor = user_dev->id.vendor;
+ dev->id.product = user_dev->id.product;
+ dev->id.version = user_dev->id.version;
+ dev->ff_effects_max = user_dev->ff_effects_max;
+
+ size = sizeof(int) * (ABS_MAX + 1);
+ memcpy(dev->absmax, user_dev->absmax, size);
+ memcpy(dev->absmin, user_dev->absmin, size);
+ memcpy(dev->absfuzz, user_dev->absfuzz, size);
+ memcpy(dev->absflat, user_dev->absflat, size);
+
+ /* check if absmin/absmax/absfuzz/absflat are filled as
+ * told in Documentation/input/input-programming.txt */
+ if (test_bit(EV_ABS, dev->evbit)) {
+ retval = uinput_validate_absbits(dev);
+ if (retval < 0)
+ kfree(dev->name);
+ }
+
+exit:
+ kfree(user_dev);
+ return retval;
+}
+
+static ssize_t uinput_write(struct file *file, const char __user *buffer, size_t count, loff_t *ppos)
+{
+ struct uinput_device *udev = file->private_data;
+
+ if (test_bit(UIST_CREATED, &(udev->state))) {
+ struct input_event ev;
+
+ if (copy_from_user(&ev, buffer, sizeof(struct input_event)))
+ return -EFAULT;
+ input_event(udev->dev, ev.type, ev.code, ev.value);
+ }
+ else
+ count = uinput_alloc_device(file, buffer, count);
+
+ return count;
+}
+
+static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count, loff_t *ppos)
+{
+ struct uinput_device *udev = file->private_data;
+ int retval = 0;
+
+ if (!test_bit(UIST_CREATED, &(udev->state)))
+ return -ENODEV;
+
+ if ((udev->head == udev->tail) && (file->f_flags & O_NONBLOCK))
+ return -EAGAIN;
+
+ retval = wait_event_interruptible(udev->waitq,
+ (udev->head != udev->tail) ||
+ !test_bit(UIST_CREATED, &(udev->state)));
+
+ if (retval)
+ return retval;
+
+ if (!test_bit(UIST_CREATED, &(udev->state)))
+ return -ENODEV;
+
+ while ((udev->head != udev->tail) &&
+ (retval + sizeof(struct input_event) <= count)) {
+ if (copy_to_user(buffer + retval, &(udev->buff[udev->tail]),
+ sizeof(struct input_event))) return -EFAULT;
+ udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
+ retval += sizeof(struct input_event);
+ }
+
+ return retval;
+}
+
+static unsigned int uinput_poll(struct file *file, poll_table *wait)
+{
+ struct uinput_device *udev = file->private_data;
+
+ poll_wait(file, &udev->waitq, wait);
+
+ if (udev->head != udev->tail)
+ return POLLIN | POLLRDNORM;
+
+ return 0;
+}
+
+static int uinput_burn_device(struct uinput_device *udev)
+{
+ if (test_bit(UIST_CREATED, &(udev->state)))
+ uinput_destroy_device(udev);
+
+ if (NULL != udev->dev->name)
+ kfree(udev->dev->name);
+ if (NULL != udev->dev->phys)
+ kfree(udev->dev->phys);
+
+ kfree(udev->dev);
+ kfree(udev);
+
+ return 0;
+}
+
+static int uinput_close(struct inode *inode, struct file *file)
+{
+ return uinput_burn_device(file->private_data);
+}
+
+static int uinput_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+ int retval = 0;
+ struct uinput_device *udev;
+ void __user *p = (void __user *)arg;
+ struct uinput_ff_upload ff_up;
+ struct uinput_ff_erase ff_erase;
+ struct uinput_request *req;
+ int length;
+
+ udev = file->private_data;
+
+ /* device attributes can not be changed after the device is created */
+ switch (cmd) {
+ case UI_SET_EVBIT:
+ case UI_SET_KEYBIT:
+ case UI_SET_RELBIT:
+ case UI_SET_ABSBIT:
+ case UI_SET_MSCBIT:
+ case UI_SET_LEDBIT:
+ case UI_SET_SNDBIT:
+ case UI_SET_FFBIT:
+ case UI_SET_PHYS:
+ if (test_bit(UIST_CREATED, &(udev->state)))
+ return -EINVAL;
+ }
+
+ switch (cmd) {
+ case UI_DEV_CREATE:
+ retval = uinput_create_device(udev);
+ break;
+
+ case UI_DEV_DESTROY:
+ retval = uinput_destroy_device(udev);
+ break;
+
+ case UI_SET_EVBIT:
+ if (arg > EV_MAX) {
+ retval = -EINVAL;
+ break;
+ }
+ set_bit(arg, udev->dev->evbit);
+ break;
+
+ case UI_SET_KEYBIT:
+ if (arg > KEY_MAX) {
+ retval = -EINVAL;
+ break;
+ }
+ set_bit(arg, udev->dev->keybit);
+ break;
+
+ case UI_SET_RELBIT:
+ if (arg > REL_MAX) {
+ retval = -EINVAL;
+ break;
+ }
+ set_bit(arg, udev->dev->relbit);
+ break;
+
+ case UI_SET_ABSBIT:
+ if (arg > ABS_MAX) {
+ retval = -EINVAL;
+ break;
+ }
+ set_bit(arg, udev->dev->absbit);
+ break;
+
+ case UI_SET_MSCBIT:
+ if (arg > MSC_MAX) {
+ retval = -EINVAL;
+ break;
+ }
+ set_bit(arg, udev->dev->mscbit);
+ break;
+
+ case UI_SET_LEDBIT:
+ if (arg > LED_MAX) {
+ retval = -EINVAL;
+ break;
+ }
+ set_bit(arg, udev->dev->ledbit);
+ break;
+
+ case UI_SET_SNDBIT:
+ if (arg > SND_MAX) {
+ retval = -EINVAL;
+ break;
+ }
+ set_bit(arg, udev->dev->sndbit);
+ break;
+
+ case UI_SET_FFBIT:
+ if (arg > FF_MAX) {
+ retval = -EINVAL;
+ break;
+ }
+ set_bit(arg, udev->dev->ffbit);
+ break;
+
+ case UI_SET_PHYS:
+ length = strnlen_user(p, 1024);
+ if (length <= 0) {
+ retval = -EFAULT;
+ break;
+ }
+ if (NULL != udev->dev->phys)
+ kfree(udev->dev->phys);
+ udev->dev->phys = kmalloc(length, GFP_KERNEL);
+ if (!udev->dev->phys) {
+ retval = -ENOMEM;
+ break;
+ }
+ if (copy_from_user(udev->dev->phys, p, length)) {
+ retval = -EFAULT;
+ kfree(udev->dev->phys);
+ udev->dev->phys = NULL;
+ break;
+ }
+ udev->dev->phys[length-1] = '\0';
+ break;
+
+ case UI_BEGIN_FF_UPLOAD:
+ if (copy_from_user(&ff_up, p, sizeof(ff_up))) {
+ retval = -EFAULT;
+ break;
+ }
+ req = uinput_request_find(udev, ff_up.request_id);
+ if (!(req && req->code==UI_FF_UPLOAD && req->u.effect)) {
+ retval = -EINVAL;
+ break;
+ }
+ ff_up.retval = 0;
+ memcpy(&ff_up.effect, req->u.effect, sizeof(struct ff_effect));
+ if (copy_to_user(p, &ff_up, sizeof(ff_up))) {
+ retval = -EFAULT;
+ break;
+ }
+ break;
+
+ case UI_BEGIN_FF_ERASE:
+ if (copy_from_user(&ff_erase, p, sizeof(ff_erase))) {
+ retval = -EFAULT;
+ break;
+ }
+ req = uinput_request_find(udev, ff_erase.request_id);
+ if (!(req && req->code==UI_FF_ERASE)) {
+ retval = -EINVAL;
+ break;
+ }
+ ff_erase.retval = 0;
+ ff_erase.effect_id = req->u.effect_id;
+ if (copy_to_user(p, &ff_erase, sizeof(ff_erase))) {
+ retval = -EFAULT;
+ break;
+ }
+ break;
+
+ case UI_END_FF_UPLOAD:
+ if (copy_from_user(&ff_up, p, sizeof(ff_up))) {
+ retval = -EFAULT;
+ break;
+ }
+ req = uinput_request_find(udev, ff_up.request_id);
+ if (!(req && req->code==UI_FF_UPLOAD && req->u.effect)) {
+ retval = -EINVAL;
+ break;
+ }
+ req->retval = ff_up.retval;
+ memcpy(req->u.effect, &ff_up.effect, sizeof(struct ff_effect));
+ req->completed = 1;
+ wake_up_interruptible(&req->waitq);
+ 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;
+ req->completed = 1;
+ wake_up_interruptible(&req->waitq);
+ break;
+
+ default:
+ retval = -EINVAL;
+ }
+ return retval;
+}
+
+static struct file_operations uinput_fops = {
+ .owner = THIS_MODULE,
+ .open = uinput_open,
+ .release = uinput_close,
+ .read = uinput_read,
+ .write = uinput_write,
+ .poll = uinput_poll,
+ .ioctl = uinput_ioctl,
+};
+
+static struct miscdevice uinput_misc = {
+ .fops = &uinput_fops,
+ .minor = UINPUT_MINOR,
+ .name = UINPUT_NAME,
+};
+
+static int __init uinput_init(void)
+{
+ return misc_register(&uinput_misc);
+}
+
+static void __exit uinput_exit(void)
+{
+ misc_deregister(&uinput_misc);
+}
+
+MODULE_AUTHOR("Aristeu Sergio Rozanski Filho");
+MODULE_DESCRIPTION("User level driver support for input subsystem");
+MODULE_LICENSE("GPL");
+
+module_init(uinput_init);
+module_exit(uinput_exit);
+