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V4L/DVB: gspca - main: Handle the audio device 

When there is an audio device, use a lower alternate setting.
This patch does not fix correctly all audio and bandwidth problems.

Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Jean-François Moine 2010-07-14 06:30:18 -03:00 committed by Mauro Carvalho Chehab
parent c4dc692ce6
commit 35680baa68
2 changed files with 24 additions and 1 deletions
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22
drivers/media/video/gspca/gspca.c
View File

@ -640,12 +640,16 @@ static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
: USB_ENDPOINT_XFER_ISOC;
i = gspca_dev->alt; /* previous alt setting */
if (gspca_dev->cam.reverse_alts) {
if (gspca_dev->audio)
i++;
while (++i < gspca_dev->nbalt) {
ep = alt_xfer(&intf->altsetting[i], xfer);
if (ep)
break;
}
} else {
if (gspca_dev->audio)
i--;
while (--i >= 0) {
ep = alt_xfer(&intf->altsetting[i], xfer);
if (ep)
@ -2146,6 +2150,24 @@ int gspca_dev_probe2(struct usb_interface *intf,
gspca_dev->dev = dev;
gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
gspca_dev->nbalt = intf->num_altsetting;
/* check if any audio device */
if (dev->config->desc.bNumInterfaces != 1) {
int i;
struct usb_interface *intf2;
for (i = 0; i < dev->config->desc.bNumInterfaces; i++) {
intf2 = dev->config->interface[i];
if (intf2 != NULL
&& intf2->altsetting != NULL
&& intf2->altsetting->desc.bInterfaceClass ==
USB_CLASS_AUDIO) {
gspca_dev->audio = 1;
break;
}
}
}
gspca_dev->sd_desc = sd_desc;
gspca_dev->nbufread = 2;
gspca_dev->empty_packet = -1; /* don't check the empty packets */

3
drivers/media/video/gspca/gspca.h
View File

@ -198,6 +198,7 @@ struct gspca_dev {
struct mutex read_lock; /* read protection */
struct mutex queue_lock; /* ISOC queue protection */
int usb_err; /* USB error - protected by usb_lock */
u16 pkt_size; /* ISOC packet size */
#ifdef CONFIG_PM
char frozen; /* suspend - resume */
#endif
@ -208,7 +209,7 @@ struct gspca_dev {
__u8 iface; /* USB interface number */
__u8 alt; /* USB alternate setting */
__u8 nbalt; /* number of USB alternate settings */
u16 pkt_size; /* ISOC packet size */
u8 audio; /* presence of audio device */
};
int gspca_dev_probe(struct usb_interface *intf,