diff options
Diffstat (limited to 'drivers/media/video/gspca/gspca.c')
| -rw-r--r-- | drivers/media/video/gspca/gspca.c | 42 |
1 files changed, 27 insertions, 15 deletions
diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c index 342a0f39e5d5..02824fc101d5 100644 --- a/drivers/media/video/gspca/gspca.c +++ b/drivers/media/video/gspca/gspca.c @@ -461,25 +461,34 @@ static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev) intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface); ep = NULL; i = gspca_dev->alt; /* previous alt setting */ + + /* try isoc */ while (--i > 0) { /* alt 0 is unusable */ ep = alt_xfer(&intf->altsetting[i], gspca_dev->cam.epaddr, - gspca_dev->bulk - ? USB_ENDPOINT_XFER_BULK - : USB_ENDPOINT_XFER_ISOC); + USB_ENDPOINT_XFER_ISOC); if (ep) break; } + + /* if no isoc, try bulk */ if (ep == NULL) { - err("no transfer endpoint found"); - return NULL; + ep = alt_xfer(&intf->altsetting[0], + gspca_dev->cam.epaddr, + USB_ENDPOINT_XFER_BULK); + if (ep == NULL) { + err("no transfer endpoint found"); + return NULL; + } } PDEBUG(D_STREAM, "use alt %d ep 0x%02x", i, ep->desc.bEndpointAddress); - ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i); - if (ret < 0) { - err("set interface err %d", ret); - return NULL; + if (i > 0) { + ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface, i); + if (ret < 0) { + err("set interface err %d", ret); + return NULL; + } } gspca_dev->alt = i; /* memorize the current alt setting */ return ep; @@ -497,9 +506,10 @@ static int create_urbs(struct gspca_dev *gspca_dev, /* calculate the packet size and the number of packets */ psize = le16_to_cpu(ep->desc.wMaxPacketSize); - /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */ - psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); - if (!gspca_dev->bulk) { + if (gspca_dev->alt != 0) { /* isoc */ + + /* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */ + psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3)); npkt = ISO_MAX_SIZE / psize; if (npkt > ISO_MAX_PKT) npkt = ISO_MAX_PKT; @@ -508,9 +518,11 @@ static int create_urbs(struct gspca_dev *gspca_dev, "isoc %d pkts size %d = bsize:%d", npkt, psize, bsize); nurbs = DEF_NURBS; - } else { + } else { /* bulk */ npkt = 0; - bsize = psize; + bsize = gspca_dev->cam. bulk_size; + if (bsize == 0) + bsize = psize; PDEBUG(D_STREAM, "bulk bsize:%d", bsize); nurbs = 1; } @@ -595,7 +607,7 @@ static int gspca_init_transfer(struct gspca_dev *gspca_dev) atomic_set(&gspca_dev->nevent, 0); /* bulk transfers are started by the subdriver */ - if (gspca_dev->bulk) + if (gspca_dev->alt == 0) break; /* submit the URBs */ |