Input: refactor evdev 32bit compat to be shareable with uinput
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>
diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
index 223d56d..46b7cae 100644
--- a/drivers/input/misc/uinput.c
+++ b/drivers/input/misc/uinput.c
@@ -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 @@
/* 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 @@
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 @@
{
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 @@
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 @@
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 @@
__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 @@
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 @@
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 @@
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 @@
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 @@
.write = uinput_write,
.poll = uinput_poll,
.unlocked_ioctl = uinput_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = uinput_compat_ioctl,
+#endif
};
static struct miscdevice uinput_misc = {