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authorBenjamin Tissoires <benjamin.tissoires@redhat.com>2014-01-30 17:20:24 -0800
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2014-02-12 15:00:34 -0800
commite3480a61fca72d40d6dc4baaf37e94fcbfa95e19 (patch)
treea34ddb7b967f9bed73ef31546f81b0bababef773 /drivers/input
parent9d51e801dba0c79ae979ef2f6928e402eb41009b (diff)
downloadop-kernel-dev-e3480a61fca72d40d6dc4baaf37e94fcbfa95e19.zip
op-kernel-dev-e3480a61fca72d40d6dc4baaf37e94fcbfa95e19.tar.gz
Input: uinput - add UI_GET_SYSNAME ioctl to retrieve the sysfs path
uinput is used in the xorg-integration-tests suite and in the wayland test suite. These automated tests suites create many virtual input devices and then hook something to read these newly created devices. Currently, uinput does not provide the created input device, which means that we rely on an heuristic to guess which input node was created. The problem is that is heuristic is subjected to races between different uinput devices or even with physical devices. Having a way to retrieve the sysfs path allows us to find without any doubts the event node. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Reviewed-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/misc/uinput.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
index d8ae08d..8569362 100644
--- a/drivers/input/misc/uinput.c
+++ b/drivers/input/misc/uinput.c
@@ -20,6 +20,8 @@
* Author: Aristeu Sergio Rozanski Filho <aris@cathedrallabs.org>
*
* Changes/Revisions:
+ * 0.4 01/09/2014 (Benjamin Tissoires <benjamin.tissoires@redhat.com>)
+ * - add UI_GET_SYSNAME ioctl
* 0.3 09/04/2006 (Anssi Hannula <anssi.hannula@gmail.com>)
* - updated ff support for the changes in kernel interface
* - added MODULE_VERSION
@@ -670,6 +672,31 @@ static int uinput_ff_upload_from_user(const char __user *buffer,
__ret; \
})
+static int uinput_str_to_user(void __user *dest, const char *str,
+ unsigned int maxlen)
+{
+ char __user *p = dest;
+ int len, ret;
+
+ if (!str)
+ return -ENOENT;
+
+ if (maxlen == 0)
+ return -EINVAL;
+
+ len = strlen(str) + 1;
+ if (len > maxlen)
+ len = maxlen;
+
+ ret = copy_to_user(p, str, len);
+ if (ret)
+ return -EFAULT;
+
+ /* force terminating '\0' */
+ ret = put_user(0, p + len - 1);
+ return ret ? -EFAULT : len;
+}
+
static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
unsigned long arg, void __user *p)
{
@@ -679,6 +706,8 @@ static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
struct uinput_ff_erase ff_erase;
struct uinput_request *req;
char *phys;
+ const char *name;
+ unsigned int size;
retval = mutex_lock_interruptible(&udev->mutex);
if (retval)
@@ -831,6 +860,20 @@ static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
goto out;
}
+ size = _IOC_SIZE(cmd);
+
+ /* Now check variable-length commands */
+ switch (cmd & ~IOCSIZE_MASK) {
+ case UI_GET_SYSNAME(0):
+ if (udev->state != UIST_CREATED) {
+ retval = -ENOENT;
+ goto out;
+ }
+ name = dev_name(&udev->dev->dev);
+ retval = uinput_str_to_user(p, name, size);
+ goto out;
+ }
+
retval = -EINVAL;
out:
mutex_unlock(&udev->mutex);
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