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Input: refactor evdev 32bit compat to be shareable with uinput

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Currently, evdev has working 32bit compatibility and uinput does not. uinput
needs the input_event code that evdev uses, so let's refactor it so it can
be shared.

[dtor@mail.ru: add fix for force feedback compat issues]
Signed-off-by: Philip Langdale <philipl@overt.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Philip Langdale
2008-10-16 22:31:42 -04:00
committed by Dmitry Torokhov
parent 49fdf6785f
commit 2d56f3a32c
5 changed files with 383 additions and 217 deletions
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172
drivers/input/misc/uinput.c
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@@ -37,6 +37,7 @@
#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)
{
@@ -78,6 +79,7 @@ static struct uinput_request* uinput_request_find(struct uinput_device *udev, in
/* 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];
}
@@ -127,6 +129,17 @@ static int uinput_dev_upload_effect(struct input_dev *dev, struct ff_effect *eff
struct uinput_request request;
int retval;
/*
* 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;
@@ -353,15 +366,15 @@ static inline ssize_t uinput_inject_event(struct uinput_device *udev, const char
{
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)
@@ -407,13 +420,13 @@ static ssize_t uinput_read(struct file *file, char __user *buffer, size_t count,
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:
@@ -444,6 +457,93 @@ static int uinput_release(struct inode *inode, struct file *file)
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; \
@@ -455,19 +555,17 @@ static int uinput_release(struct inode *inode, struct file *file)
__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 = mutex_lock_interruptible(&udev->mutex);
if (retval)
return retval;
@@ -549,26 +647,24 @@ static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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.upload.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.upload.effect, sizeof(struct ff_effect));
ff_up.effect = *req->u.upload.effect;
if (req->u.upload.old)
memcpy(&ff_up.old, req->u.upload.old, sizeof(struct ff_effect));
ff_up.old = *req->u.upload.old;
else
memset(&ff_up.old, 0, sizeof(struct ff_effect));
if (copy_to_user(p, &ff_up, sizeof(ff_up))) {
retval = -EFAULT;
break;
}
retval = uinput_ff_upload_to_user(p, &ff_up);
break;
case UI_BEGIN_FF_ERASE:
@@ -576,29 +672,34 @@ static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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.upload.effect)) {
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;
@@ -608,11 +709,13 @@ static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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;
@@ -626,6 +729,18 @@ static long uinput_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
return retval;
}
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,
@@ -634,6 +749,9 @@ static const struct file_operations uinput_fops = {
.write = uinput_write,
.poll = uinput_poll,
.unlocked_ioctl = uinput_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = uinput_compat_ioctl,
#endif
};
static struct miscdevice uinput_misc = {