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| author | Hans de Goede <hdegoede@redhat.com> | 2013-10-09 17:19:31 +0200 |
|---|---|---|
| committer | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2014-03-04 15:38:05 -0800 |
| commit | bcf7f6e39335af4f03da8c26a98185fd49754fcc (patch) | |
| tree | 61a8b40af9264409c66ced8ac324e3f3274f00ff /include/uapi/linux/usbdevice_fs.h | |
| parent | 2fec32b06e374642802f7fb4f5350317cd14732b (diff) | |
| download | lwn-bcf7f6e39335af4f03da8c26a98185fd49754fcc.tar.gz lwn-bcf7f6e39335af4f03da8c26a98185fd49754fcc.zip | |
usbfs: Add support for allocating / freeing streams
This allows userspace to use bulk-streams, just like in kernel drivers, see
Documentation/usb/bulk-streams.txt for details on the in kernel API. This
is exported pretty much one on one to userspace.
To use streams an app must first make a USBDEVFS_ALLOC_STREAMS ioctl,
on success this will return the number of streams available (which may be
less then requested). If there are n streams the app can then submit
usbdevfs_urb-s with their stream_id member set to 1-n to use a specific
stream. IE if USBDEVFS_ALLOC_STREAMS returns 4 then stream_id 1-4 can be
used.
When the app is done using streams it should call USBDEVFS_FREE_STREAMS
Note applications are advised to use libusb rather then using the
usbdevfs api directly. The latest version of libusb has support for streams.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Diffstat (limited to 'include/uapi/linux/usbdevice_fs.h')
| -rw-r--r-- | include/uapi/linux/usbdevice_fs.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/uapi/linux/usbdevice_fs.h b/include/uapi/linux/usbdevice_fs.h index cbf122db56bc..abe5f4bd4d82 100644 --- a/include/uapi/linux/usbdevice_fs.h +++ b/include/uapi/linux/usbdevice_fs.h @@ -147,6 +147,11 @@ struct usbdevfs_disconnect_claim { char driver[USBDEVFS_MAXDRIVERNAME + 1]; }; +struct usbdevfs_streams { + unsigned int num_streams; /* Not used by USBDEVFS_FREE_STREAMS */ + unsigned int num_eps; + unsigned char eps[0]; +}; #define USBDEVFS_CONTROL _IOWR('U', 0, struct usbdevfs_ctrltransfer) #define USBDEVFS_CONTROL32 _IOWR('U', 0, struct usbdevfs_ctrltransfer32) @@ -179,5 +184,7 @@ struct usbdevfs_disconnect_claim { #define USBDEVFS_RELEASE_PORT _IOR('U', 25, unsigned int) #define USBDEVFS_GET_CAPABILITIES _IOR('U', 26, __u32) #define USBDEVFS_DISCONNECT_CLAIM _IOR('U', 27, struct usbdevfs_disconnect_claim) +#define USBDEVFS_ALLOC_STREAMS _IOR('U', 28, struct usbdevfs_streams) +#define USBDEVFS_FREE_STREAMS _IOR('U', 29, struct usbdevfs_streams) #endif /* _UAPI_LINUX_USBDEVICE_FS_H */ |