#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;
return 0;
}
-static int uinput_request_alloc_id(struct input_dev *dev, struct uinput_request *request)
+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. */
- struct uinput_device *udev = dev->private;
int id;
+ int err = -1;
- down(&udev->requests_sem);
- for (id=0; id<UINPUT_NUM_REQUESTS; id++)
+ spin_lock(&udev->requests_lock);
+
+ 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;
+ udev->requests[id] = request;
+ err = 0;
+ break;
}
- up(&udev->requests_sem);
- return -1;
+
+ 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;
- 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)
+static inline int uinput_request_reserve_slot(struct uinput_device *udev, struct uinput_request *request)
{
- struct uinput_device *udev = dev->private;
+ /* Allocate slot. If none are available right away, wait. */
+ return wait_event_interruptible(udev->requests_waitq,
+ !uinput_request_alloc_id(udev, request));
+}
- memset(request, 0, sizeof(struct uinput_request));
- request->code = code;
- init_waitqueue_head(&request->waitq);
+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);
- /* Allocate an ID. If none are available right away, wait. */
- request->retval = wait_event_interruptible(udev->requests_waitq,
- !uinput_request_alloc_id(dev, request));
+ complete(&request->done);
}
-static void uinput_request_submit(struct input_dev *dev, struct uinput_request *request)
+static int 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);
+ wait_for_completion(&request->done);
+ return request->retval;
}
static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect)
{
struct uinput_request request;
+ int retval;
if (!test_bit(EV_FF, dev->evbit))
return -ENOSYS;
- uinput_request_init(dev, &request, UI_FF_UPLOAD);
- if (request.retval)
- return request.retval;
+ request.id = -1;
+ init_completion(&request.done);
+ request.code = UI_FF_UPLOAD;
request.u.effect = effect;
- uinput_request_submit(dev, &request);
- return request.retval;
+
+ retval = uinput_request_reserve_slot(dev->private, &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;
- uinput_request_init(dev, &request, UI_FF_ERASE);
- if (request.retval)
- return request.retval;
+ request.id = -1;
+ init_completion(&request.done);
+ request.code = UI_FF_ERASE;
request.u.effect_id = effect_id;
- uinput_request_submit(dev, &request);
- return request.retval;
+
+ retval = uinput_request_reserve_slot(dev->private, &request);
+ if (!retval)
+ retval = uinput_request_submit(dev, &request);
+
+ return retval;
}
-static int uinput_create_device(struct uinput_device *udev)
+static void uinput_destroy_device(struct uinput_device *udev)
{
- if (!udev->dev->name) {
- printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
- return -EINVAL;
+ 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->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;
+ udev->state = UIST_NEW_DEVICE;
}
-static int uinput_destroy_device(struct uinput_device *udev)
+static int uinput_create_device(struct uinput_device *udev)
{
- if (!test_bit(UIST_CREATED, &(udev->state))) {
- printk(KERN_WARNING "%s: create the device first\n", UINPUT_NAME);
+ int error;
+
+ if (udev->state != UIST_SETUP_COMPLETE) {
+ printk(KERN_DEBUG "%s: write device info first\n", UINPUT_NAME);
return -EINVAL;
}
- input_unregister_device(udev->dev);
+ error = input_register_device(udev->dev);
+ if (error) {
+ uinput_destroy_device(udev);
+ return error;
+ }
- clear_bit(UIST_CREATED, &(udev->state));
+ udev->state = UIST_CREATED;
return 0;
}
static int uinput_open(struct inode *inode, struct file *file)
{
- struct uinput_device *newdev;
- struct input_dev *newinput;
+ struct uinput_device *newdev;
- newdev = kmalloc(sizeof(struct uinput_device), GFP_KERNEL);
+ newdev = kzalloc(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));
+ return -ENOMEM;
- newdev->dev = newinput;
+ 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;
return 0;
-cleanup:
- kfree(newdev);
-error:
- return -ENOMEM;
}
static int uinput_validate_absbits(struct input_dev *dev)
return retval;
}
-static int uinput_alloc_device(struct file *file, const char __user *buffer, size_t count)
+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;
+ udev->dev->upload_effect = uinput_dev_upload_effect;
+ udev->dev->erase_effect = uinput_dev_erase_effect;
+ udev->dev->private = 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;
- struct uinput_device *udev;
- int size,
- retval;
+ char *name;
+ int size;
+ int retval;
- retval = count;
+ if (count != sizeof(struct uinput_user_dev))
+ return -EINVAL;
+
+ if (!udev->dev) {
+ retval = uinput_allocate_device(udev);
+ if (retval)
+ return retval;
+ }
- udev = file->private_data;
dev = udev->dev;
- user_dev = kmalloc(sizeof(*user_dev), GFP_KERNEL);
- if (!user_dev) {
- retval = -ENOMEM;
- goto exit;
- }
+ 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;
}
- 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) {
+ 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);
- 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;
if (test_bit(EV_ABS, dev->evbit)) {
retval = uinput_validate_absbits(dev);
if (retval < 0)
- kfree(dev->name);
+ goto exit;
}
-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;
- if (test_bit(UIST_CREATED, &(udev->state))) {
- struct input_event ev;
+ retval = mutex_lock_interruptible(&udev->mutex);
+ if (retval)
+ return retval;
- 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);
+ retval = udev->state == UIST_CREATED ?
+ uinput_inject_event(udev, buffer, count) :
+ uinput_setup_device(udev, buffer, count);
- return 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 (!test_bit(UIST_CREATED, &(udev->state)))
+ if (udev->state != UIST_CREATED)
return -ENODEV;
- if ((udev->head == udev->tail) && (file->f_flags & O_NONBLOCK))
+ 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)));
+ udev->head != udev->tail || udev->state != UIST_CREATED);
+ if (retval)
+ return retval;
+ retval = mutex_lock_interruptible(&udev->mutex);
if (retval)
return retval;
- if (!test_bit(UIST_CREATED, &(udev->state)))
- return -ENODEV;
+ 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))) return -EFAULT;
+ 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;
}
return 0;
}
-static int uinput_burn_device(struct uinput_device *udev)
+static int uinput_release(struct inode *inode, struct file *file)
{
- 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);
+ struct uinput_device *udev = file->private_data;
- kfree(udev->dev);
+ uinput_destroy_device(udev);
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)
+#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 = 0;
+ 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;
- /* 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;
+ retval = mutex_lock_interruptible(&udev->mutex);
+ if (retval)
+ return retval;
+
+ if (!udev->dev) {
+ retval = uinput_allocate_device(udev);
+ if (retval)
+ goto out;
}
switch (cmd) {
break;
case UI_DEV_DESTROY:
- retval = uinput_destroy_device(udev);
+ uinput_destroy_device(udev);
break;
case UI_SET_EVBIT:
- if (arg > EV_MAX) {
- retval = -EINVAL;
- break;
- }
- set_bit(arg, udev->dev->evbit);
+ retval = uinput_set_bit(arg, evbit, EV_MAX);
break;
case UI_SET_KEYBIT:
- if (arg > KEY_MAX) {
- retval = -EINVAL;
- break;
- }
- set_bit(arg, udev->dev->keybit);
+ retval = uinput_set_bit(arg, keybit, KEY_MAX);
break;
case UI_SET_RELBIT:
- if (arg > REL_MAX) {
- retval = -EINVAL;
- break;
- }
- set_bit(arg, udev->dev->relbit);
+ retval = uinput_set_bit(arg, relbit, REL_MAX);
break;
case UI_SET_ABSBIT:
- if (arg > ABS_MAX) {
- retval = -EINVAL;
- break;
- }
- set_bit(arg, udev->dev->absbit);
+ retval = uinput_set_bit(arg, absbit, ABS_MAX);
break;
case UI_SET_MSCBIT:
- if (arg > MSC_MAX) {
- retval = -EINVAL;
- break;
- }
- set_bit(arg, udev->dev->mscbit);
+ retval = uinput_set_bit(arg, mscbit, MSC_MAX);
break;
case UI_SET_LEDBIT:
- if (arg > LED_MAX) {
- retval = -EINVAL;
- break;
- }
- set_bit(arg, udev->dev->ledbit);
+ retval = uinput_set_bit(arg, ledbit, LED_MAX);
break;
case UI_SET_SNDBIT:
- if (arg > SND_MAX) {
- retval = -EINVAL;
- break;
- }
- set_bit(arg, udev->dev->sndbit);
+ retval = uinput_set_bit(arg, sndbit, SND_MAX);
break;
case UI_SET_FFBIT:
- if (arg > FF_MAX) {
- retval = -EINVAL;
- break;
- }
- set_bit(arg, udev->dev->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;
}
- if (NULL != udev->dev->phys)
- kfree(udev->dev->phys);
- udev->dev->phys = kmalloc(length, GFP_KERNEL);
- if (!udev->dev->phys) {
+ kfree(udev->dev->phys);
+ udev->dev->phys = phys = kmalloc(length, GFP_KERNEL);
+ if (!phys) {
retval = -ENOMEM;
break;
}
- if (copy_from_user(udev->dev->phys, p, length)) {
- retval = -EFAULT;
- kfree(udev->dev->phys);
+ if (copy_from_user(phys, p, length)) {
udev->dev->phys = NULL;
+ kfree(phys);
+ retval = -EFAULT;
break;
}
- udev->dev->phys[length-1] = '\0';
+ phys[length - 1] = '\0';
break;
case UI_BEGIN_FF_UPLOAD:
break;
}
req = uinput_request_find(udev, ff_up.request_id);
- if (!(req && req->code==UI_FF_UPLOAD && req->u.effect)) {
+ if (!(req && req->code == UI_FF_UPLOAD && req->u.effect)) {
retval = -EINVAL;
break;
}
break;
}
req = uinput_request_find(udev, ff_erase.request_id);
- if (!(req && req->code==UI_FF_ERASE)) {
+ if (!(req && req->code == UI_FF_ERASE)) {
retval = -EINVAL;
break;
}
break;
}
req = uinput_request_find(udev, ff_up.request_id);
- if (!(req && req->code==UI_FF_UPLOAD && req->u.effect)) {
+ 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);
+ uinput_request_done(udev, req);
break;
case UI_END_FF_ERASE:
break;
}
req = uinput_request_find(udev, ff_erase.request_id);
- if (!(req && req->code==UI_FF_ERASE)) {
+ if (!(req && req->code == UI_FF_ERASE)) {
retval = -EINVAL;
break;
}
req->retval = ff_erase.retval;
- req->completed = 1;
- wake_up_interruptible(&req->waitq);
+ uinput_request_done(udev, req);
break;
default:
retval = -EINVAL;
}
+
+ out:
+ mutex_unlock(&udev->mutex);
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,
+ .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,
+ .fops = &uinput_fops,
+ .minor = UINPUT_MINOR,
+ .name = UINPUT_NAME,
};
static int __init uinput_init(void)
git://git.onelab.eu / linux-2.6.git / blobdiff