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authorHans de Goede <hdegoede@redhat.com>2013-10-09 17:19:29 +0200
committerSarah Sharp <sarah.a.sharp@linux.intel.com>2014-03-04 15:38:04 -0800
commit948cd8c18c466fdcbe707bb2a42a148796bfccdd (patch)
treeaa01759923cee68262cc5ed40340576afbc436e3 /drivers/usb/core
parentb2d03eb56e66620a9b27f1a0c2795722087effc9 (diff)
usbfs: Add support for bulk stream ids
This patch makes it possible to specify a bulk stream id when submitting an urb using the async usbfs API. It overloads the number_of_packets usbdevfs_urb field for this. This is not pretty, but given other constraints it is the best we can do. The reasoning leading to this goes as follows: 1) We want to support bulk streams in the usbfs API 2) We do not want to extend the usbdevfs_urb struct with a new member, as that would mean defining new ioctl numbers for all async API ioctls + adding compat versions for the old ones (times 2 for 32 bit support) 3) 1 + 2 means we need to re-use an existing field 4) number_of_packets is only used for isoc urbs, and streams are bulk only so it is the best (and only) candidate for re-using Note that: 1) This patch only uses number_of_packets as stream_id if the app has actually allocated streams on the ep, so that old apps which may have garbage in there (as it was unused until now in the bulk case), will not break 2) This patch does not add support for allocating / freeing bulk-streams, that is done in a follow up patch Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Diffstat (limited to 'drivers/usb/core')
-rw-r--r--drivers/usb/core/devio.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index c88d8bfaca8..d7571a63181 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -1209,6 +1209,7 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
unsigned int u, totlen, isofrmlen;
int i, ret, is_in, num_sgs = 0, ifnum = -1;
int number_of_packets = 0;
+ unsigned int stream_id = 0;
void *buf;
if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
@@ -1294,6 +1295,8 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
num_sgs = 0;
+ if (ep->streams)
+ stream_id = uurb->stream_id;
break;
case USBDEVFS_URB_TYPE_INTERRUPT:
@@ -1444,6 +1447,7 @@ static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
dr = NULL;
as->urb->start_frame = uurb->start_frame;
as->urb->number_of_packets = number_of_packets;
+ as->urb->stream_id = stream_id;
if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
ps->dev->speed == USB_SPEED_HIGH)
as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);