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Input: uinput - add UI_GET_VERSION ioctl

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This ioctl is the counterpart to EVIOCGVERSION and returns the
uinput-version the kernel was compiled with.

Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
David Herrmann 2014-07-20 17:27:09 -07:00 committed by Dmitry Torokhov
parent bcb898e587
commit ba4e9a61ad
2 changed files with 15 additions and 0 deletions
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6
drivers/input/misc/uinput.c
View File

@ -723,6 +723,12 @@ static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
}
switch (cmd) {
case UI_GET_VERSION:
if (put_user(UINPUT_VERSION,
(unsigned int __user *)p))
retval = -EFAULT;
goto out;
case UI_DEV_CREATE:
retval = uinput_create_device(udev);
goto out;

9
include/uapi/linux/uinput.h
View File

@ -84,6 +84,15 @@ struct uinput_ff_erase {
*/
#define UI_GET_SYSNAME(len) _IOC(_IOC_READ, UINPUT_IOCTL_BASE, 300, len)
/**
* UI_GET_VERSION - Return version of uinput protocol
*
* This writes uinput protocol version implemented by the kernel into
* the integer pointed to by the ioctl argument. The protocol version
* is hard-coded in the kernel and is independent of the uinput device.
*/
#define UI_GET_VERSION _IOR(UINPUT_IOCTL_BASE, 301, unsigned int)
/*
* To write a force-feedback-capable driver, the upload_effect
* and erase_effect callbacks in input_dev must be implemented.