diff options
| -rw-r--r-- | drivers/input/misc/uinput.c | 43 | ||||
| -rw-r--r-- | include/linux/uinput.h | 2 | ||||
| -rw-r--r-- | include/uapi/linux/uinput.h | 13 |
3 files changed, 57 insertions, 1 deletions
diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c index d8ae08d12abf..856936247500 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); diff --git a/include/linux/uinput.h b/include/linux/uinput.h index 0a4487d3fb1e..0994c0d01a09 100644 --- a/include/linux/uinput.h +++ b/include/linux/uinput.h @@ -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 24/05/2006 (Anssi Hannula <anssi.hannulagmail.com>) * - update ff support for the changes in kernel interface * - add UINPUT_VERSION diff --git a/include/uapi/linux/uinput.h b/include/uapi/linux/uinput.h index fe46431593f9..0389b489bbba 100644 --- a/include/uapi/linux/uinput.h +++ b/include/uapi/linux/uinput.h @@ -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 24/05/2006 (Anssi Hannula <anssi.hannulagmail.com>) * - update ff support for the changes in kernel interface * - add UINPUT_VERSION @@ -35,7 +37,7 @@ #include <linux/types.h> #include <linux/input.h> -#define UINPUT_VERSION 3 +#define UINPUT_VERSION 4 struct uinput_ff_upload { @@ -73,6 +75,15 @@ struct uinput_ff_erase { #define UI_BEGIN_FF_ERASE _IOWR(UINPUT_IOCTL_BASE, 202, struct uinput_ff_erase) #define UI_END_FF_ERASE _IOW(UINPUT_IOCTL_BASE, 203, struct uinput_ff_erase) +/** + * UI_GET_SYSNAME - get the sysfs name of the created uinput device + * + * @return the sysfs name of the created virtual input device. + * The complete sysfs path is then /sys/devices/virtual/input/--NAME-- + * Usually, it is in the form "inputN" + */ +#define UI_GET_SYSNAME(len) _IOC(_IOC_READ, UINPUT_IOCTL_BASE, 300, len) + /* * To write a force-feedback-capable driver, the upload_effect * and erase_effect callbacks in input_dev must be implemented. |