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V4L/DVB (9682): gspca: New subdriver parameter 'bulk_nurbs'.

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Some webcams with image transfer by bulk messages accept one or many
permanent bulk read.

Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Antonio Ospite 2008-11-14 07:53:32 -03:00 committed by Mauro Carvalho Chehab
parent 6270330abe
commit dff369aad6
2 changed files with 19 additions and 4 deletions
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19
drivers/media/video/gspca/gspca.c
View File

@ -203,6 +203,7 @@ static void bulk_irq(struct urb *urb
{
struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
struct gspca_frame *frame;
int st;
PDEBUG(D_PACK, "bulk irq");
if (!gspca_dev->streaming)
@ -226,6 +227,13 @@ static void bulk_irq(struct urb *urb
urb->transfer_buffer,
urb->actual_length);
}
/* resubmit the URB */
if (gspca_dev->cam.bulk_nurbs != 0) {
st = usb_submit_urb(urb, GFP_ATOMIC);
if (st < 0)
PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
}
}
/*
@ -523,11 +531,14 @@ static int create_urbs(struct gspca_dev *gspca_dev,
nurbs = DEF_NURBS;
} else { /* bulk */
npkt = 0;
bsize = gspca_dev->cam. bulk_size;
bsize = gspca_dev->cam.bulk_size;
if (bsize == 0)
bsize = psize;
PDEBUG(D_STREAM, "bulk bsize:%d", bsize);
nurbs = 1;
if (gspca_dev->cam.bulk_nurbs != 0)
nurbs = gspca_dev->cam.bulk_nurbs;
else
nurbs = 1;
}
gspca_dev->nurbs = nurbs;
@ -615,8 +626,8 @@ static int gspca_init_transfer(struct gspca_dev *gspca_dev)
gspca_dev->streaming = 1;
atomic_set(&gspca_dev->nevent, 0);
/* bulk transfers are started by the subdriver */
if (gspca_dev->alt == 0)
/* some bulk transfers are started by the subdriver */
if (gspca_dev->alt == 0 && gspca_dev->cam.bulk_nurbs == 0)
break;
/* submit the URBs */

4
drivers/media/video/gspca/gspca.h
View File

@ -58,6 +58,10 @@ struct cam {
int bulk_size; /* buffer size when image transfer by bulk */
struct v4l2_pix_format *cam_mode; /* size nmodes */
char nmodes;
__u8 bulk_nurbs; /* number of URBs in bulk mode
* - cannot be > MAX_NURBS
* - when 0 and bulk_size != 0 means
* 1 URB and submit done by subdriver */
__u8 epaddr;
};