V4L/DVB (13178): gspca: Add support for Winbond W9967CF and W9968CF camera's

This patch adds support to gspca for the Winbond W9967CF and W9968CF
camera's. This is mostly a port of the existing v4l1 driver to gspca
(making it v4l2). But this also features fixes to the bitbanging i2c code
(send a nack not an ack after reading the last byte of a transfer), which
gets rid of the weird errors which were being seen there, and of
the smbus_refresh() hack to get around these errors.

Also the vstart settings have been tweaked to work with different
frequency filter settings.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 17 insertions, 5 deletions

diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c
index 179cbc14ee51..ebaa2425fb50 100644
--- a/drivers/media/video/gspca/gspca.c
+++ b/drivers/media/video/gspca/gspca.c
@@ -475,10 +475,18 @@ static struct usb_host_endpoint *get_ep(struct gspca_dev *gspca_dev)
         xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
                                    : USB_ENDPOINT_XFER_ISOC;
         i = gspca_dev->alt;                     /* previous alt setting */
-        while (--i >= 0) {
-                ep = alt_xfer(&intf->altsetting[i], xfer);
-                if (ep)
-                        break;
+        if (gspca_dev->cam.reverse_alts) {
+                while (++i < gspca_dev->nbalt) {
+                        ep = alt_xfer(&intf->altsetting[i], xfer);
+                        if (ep)
+                                break;
+                }
+        } else {
+                while (--i >= 0) {
+                        ep = alt_xfer(&intf->altsetting[i], xfer);
+                        if (ep)
+                                break;
+                }
         }
         if (ep == NULL) {
                 err("no transfer endpoint found");
@@ -599,7 +607,11 @@ static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 
         /* set the higher alternate setting and
          * loop until urb submit succeeds */
-        gspca_dev->alt = gspca_dev->nbalt;
+        if (gspca_dev->cam.reverse_alts)
+                gspca_dev->alt = 0;
+        else
+                gspca_dev->alt = gspca_dev->nbalt;
+
         if (gspca_dev->sd_desc->isoc_init) {
                 ret = gspca_dev->sd_desc->isoc_init(gspca_dev);
                 if (ret < 0)