From 0dc641dc9f7f168fc45f3032b22dcf7d5b57c47c Mon Sep 17 00:00:00 2001
From: Jean-Francois Moine <moinejf@free.fr>
Date: Thu, 19 Mar 2009 05:55:22 -0300
Subject: [PATCH] V4L/DVB (11103): gspca - main: May have isochronous transfers
on altsetting 0
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
---
drivers/media/video/gspca/gspca.c | 12 +++++++-----
drivers/media/video/gspca/gspca.h | 1 +
2 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c
index ed18401fd8ba..66e91d896eda 100644
--- a/drivers/media/video/gspca/gspca.c
+++ b/drivers/media/video/gspca/gspca.c
@@ -474,14 +474,14 @@ static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
i = gspca_dev->alt; /* previous alt setting */
/* try isoc */
- while (--i > 0) { /* alt 0 is unusable */
+ while (--i >= 0) {
ep = alt_xfer(&intf->altsetting[i],
USB_ENDPOINT_XFER_ISOC);
if (ep)
break;
}
- /* if no isoc, try bulk */
+ /* if no isoc, try bulk (alt 0 only) */
if (ep == NULL) {
ep = alt_xfer(&intf->altsetting[0],
USB_ENDPOINT_XFER_BULK);
@@ -489,6 +489,8 @@ static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
err("no transfer endpoint found");
return NULL;
}
+ i = 0;
+ gspca_dev->bulk = 1;
}
PDEBUG(D_STREAM, "use alt %d ep 0x%02x",
i, ep->desc.bEndpointAddress);
@@ -515,7 +517,7 @@ 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);
- if (gspca_dev->alt != 0) { /* isoc */
+ if (!gspca_dev->bulk) { /* isoc */
/* See paragraph 5.9 / table 5-11 of the usb 2.0 spec. */
psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
@@ -615,7 +617,7 @@ static int gspca_init_transfer(struct gspca_dev *gspca_dev)
goto out;
/* clear the bulk endpoint */
- if (gspca_dev->alt == 0) /* if bulk transfer */
+ if (gspca_dev->bulk)
usb_clear_halt(gspca_dev->dev,
gspca_dev->urb[0]->pipe);
@@ -628,7 +630,7 @@ static int gspca_init_transfer(struct gspca_dev *gspca_dev)
gspca_dev->streaming = 1;
/* some bulk transfers are started by the subdriver */
- if (gspca_dev->alt == 0 && gspca_dev->cam.bulk_nurbs == 0)
+ if (gspca_dev->bulk && gspca_dev->cam.bulk_nurbs == 0)
break;
/* submit the URBs */
diff --git a/drivers/media/video/gspca/gspca.h b/drivers/media/video/gspca/gspca.h
index 6f172e9e5fe9..e4d4cf6ce05a 100644
--- a/drivers/media/video/gspca/gspca.h
+++ b/drivers/media/video/gspca/gspca.h
@@ -167,6 +167,7 @@ struct gspca_dev {
__u8 iface; /* USB interface number */
__u8 alt; /* USB alternate setting */
__u8 nbalt; /* number of USB alternate settings */
+ u8 bulk; /* image transfer by 0:isoc / 1:bulk */
};
int gspca_dev_probe(struct usb_interface *intf,
--
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