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>

2 files changed, 24 insertions, 1 deletions

diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c
index 29b047942826..d951b0f0e053 100644
--- a/drivers/media/video/gspca/gspca.c
+++ b/drivers/media/video/gspca/gspca.c
@@ -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 */
diff --git a/drivers/media/video/gspca/gspca.h b/drivers/media/video/gspca/gspca.h
index 17e55580631e..b749c36d9f7e 100644
--- a/drivers/media/video/gspca/gspca.h
+++ b/drivers/media/video/gspca/gspca.h
@@ -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,