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usbfs: Add support for allocating / freeing streams

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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>
This commit is contained in:
Hans de Goede 2013-10-09 17:19:31 +02:00 • committed by Sarah Sharp
parent 2fec32b06e
commit bcf7f6e393
2 changed files with 125 additions and 0 deletions
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7
include/uapi/linux/usbdevice_fs.h
View file

@ -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 */