* 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
* - first public version
*/
#include <linux/poll.h>
+#include <linux/sched.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>
+#include "../input-compat.h"
static int uinput_dev_event(struct input_dev *dev, unsigned int type, unsigned int code, int value)
{
- struct uinput_device *udev;
-
- udev = dev->private;
+ struct uinput_device *udev = input_get_drvdata(dev);
udev->buff[udev->head].type = type;
udev->buff[udev->head].code = code;
return 0;
}
+/* Atomically allocate an ID for the given request. Returns 0 on success. */
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++)
+ 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)
+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];
}
complete(&request->done);
}
-static int uinput_request_submit(struct input_dev *dev, struct uinput_request *request)
+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 = mutex_lock_interruptible(&udev->mutex);
+ if (retval)
+ return retval;
+
+ if (udev->state != UIST_CREATED) {
+ retval = -ENODEV;
+ goto out;
+ }
+
/* Tell our userspace app about this new request by queueing an input event */
- uinput_dev_event(dev, EV_UINPUT, request->code, request->id);
+ uinput_dev_event(udev->dev, EV_UINPUT, request->code, request->id);
- /* Wait for the request to complete */
- wait_for_completion(&request->done);
- return request->retval;
+ out:
+ mutex_unlock(&udev->mutex);
+ return retval;
}
-static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *effect)
+/*
+ * Fail all ouitstanding 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;
+ uinput_request_done(udev, request);
+ }
+ }
+
+ 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;
int retval;
- if (!test_bit(EV_FF, dev->evbit))
- return -ENOSYS;
+ /*
+ * 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.id = -1;
init_completion(&request.done);
request.code = UI_FF_UPLOAD;
- request.u.effect = effect;
+ request.u.upload.effect = effect;
+ request.u.upload.old = old;
- retval = uinput_request_reserve_slot(dev->private, &request);
- if (!retval)
- retval = uinput_request_submit(dev, &request);
+ retval = uinput_request_submit(udev, &request);
+ if (!retval) {
+ wait_for_completion(&request.done);
+ retval = request.retval;
+ }
return retval;
}
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;
int retval;
request.code = UI_FF_ERASE;
request.u.effect_id = effect_id;
- retval = uinput_request_reserve_slot(dev->private, &request);
- if (!retval)
- retval = uinput_request_submit(dev, &request);
+ retval = uinput_request_submit(udev, &request);
+ if (!retval) {
+ wait_for_completion(&request.done);
+ retval = request.retval;
+ }
return retval;
}
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 (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);
+ 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;
}
-
- 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) {
return -EINVAL;
}
- error = input_register_device(udev->dev);
- if (error) {
- uinput_destroy_device(udev);
- return error;
+ 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)
if (!newdev)
return -ENOMEM;
- init_MUTEX(&newdev->sem);
+ 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;
}
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;
+ input_set_drvdata(udev->dev, udev);
return 0;
}
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;
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);
{
struct input_event ev;
- if (count != sizeof(struct input_event))
+ if (count < input_event_size())
return -EINVAL;
- if (copy_from_user(&ev, buffer, sizeof(struct input_event)))
+ if (input_event_from_user(buffer, &ev))
return -EFAULT;
input_event(udev->dev, ev.type, ev.code, ev.value);
- return sizeof(struct input_event);
+ return input_event_size();
}
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 = down_interruptible(&udev->sem);
+ retval = mutex_lock_interruptible(&udev->mutex);
if (retval)
return retval;
uinput_inject_event(udev, buffer, count) :
uinput_setup_device(udev, buffer, count);
- up(&udev->sem);
+ mutex_unlock(&udev->mutex);
return retval;
}
if (retval)
return retval;
- retval = down_interruptible(&udev->sem);
+ retval = mutex_lock_interruptible(&udev->mutex);
if (retval)
return retval;
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))) {
+ while (udev->head != udev->tail && retval + input_event_size() <= count) {
+ if (input_event_to_user(buffer + retval, &udev->buff[udev->tail])) {
retval = -EFAULT;
goto out;
}
udev->tail = (udev->tail + 1) % UINPUT_BUFFER_SIZE;
- retval += sizeof(struct input_event);
+ retval += input_event_size();
}
out:
- up(&udev->sem);
+ mutex_unlock(&udev->mutex);
return retval;
}
return 0;
}
+#ifdef CONFIG_COMPAT
+struct uinput_ff_upload_compat {
+ int request_id;
+ int 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 (INPUT_COMPAT_TEST) {
+ 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 (INPUT_COMPAT_TEST) {
+ 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; \
__ret; \
})
-static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
+ unsigned long arg, void __user *p)
{
int retval;
- struct uinput_device *udev;
- void __user *p = (void __user *)arg;
+ struct uinput_device *udev = file->private_data;
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 = down_interruptible(&udev->sem);
+ retval = mutex_lock_interruptible(&udev->mutex);
if (retval)
return retval;
break;
case UI_BEGIN_FF_UPLOAD:
- if (copy_from_user(&ff_up, p, sizeof(ff_up))) {
- retval = -EFAULT;
+ retval = uinput_ff_upload_from_user(p, &ff_up);
+ if (retval)
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.upload.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;
- }
+ 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);
break;
case UI_BEGIN_FF_ERASE:
retval = -EFAULT;
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;
}
+
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;
+ retval = uinput_ff_upload_from_user(p, &ff_up);
+ if (retval)
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.upload.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;
retval = -EFAULT;
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;
uinput_request_done(udev, req);
break;
}
out:
- up(&udev->sem);
+ mutex_unlock(&udev->mutex);
return retval;
}
-static struct file_operations uinput_fops = {
+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
+static long uinput_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ 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,
.write = uinput_write,
.poll = uinput_poll,
.unlocked_ioctl = uinput_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = uinput_compat_ioctl,
+#endif
};
static struct miscdevice 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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