[media] gspca - sonixj: Move the avg lum computation to a separate function

Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/gspca/sonixj.c b/drivers/media/video/gspca/sonixj.c
index d6f39ce..c414707 100644 (file)
--- a/drivers/media/video/gspca/sonixj.c
+++ b/drivers/media/video/gspca/sonixj.c
@@ -2757,6 +2757,29 @@ static void do_autogain(struct gspca_dev *gspca_dev)
        }
 }
 
+/* set the average luminosity from an isoc marker */
+static void set_lum(struct sd *sd,
+                   u8 *data)
+{
+       int avg_lum;
+
+       /*      w0 w1 w2
+        *      w3 w4 w5
+        *      w6 w7 w8
+        */
+       avg_lum = (data[27] << 8) + data[28]            /* w3 */
+
+               + (data[31] << 8) + data[32]            /* w5 */
+
+               + (data[23] << 8) + data[24]            /* w1 */
+
+               + (data[35] << 8) + data[36]            /* w7 */
+
+               + (data[29] << 10) + (data[30] << 2);   /* w4 * 4 */
+       avg_lum >>= 10;
+       atomic_set(&sd->avg_lum, avg_lum);
+}
+
 /* scan the URB packets */
 /* This function is run at interrupt level. */
 static void sd_pkt_scan(struct gspca_dev *gspca_dev,
@@ -2764,7 +2787,7 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
                        int len)                        /* iso packet length */
 {
        struct sd *sd = (struct sd *) gspca_dev;
-       int sof, avg_lum;
+       int sof;
 
        /* the image ends on a 64 bytes block starting with
         *      ff d9 ff ff 00 c4 c4 96
@@ -2795,23 +2818,8 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
        /* end of image found - remove the trailing data */
        gspca_dev->image_len = sof + 2;
        gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0);
-       if (sd->ag_cnt < 0)
-               return;
-/* w1 w2 w3 */
-/* w4 w5 w6 */
-/* w7 w8 */
-/* w4 */
-       avg_lum = ((data[sof + 29] << 8) | data[sof + 30]) >> 6;
-/* w6 */
-       avg_lum += ((data[sof + 33] << 8) | data[sof + 34]) >> 6;
-/* w2 */
-       avg_lum += ((data[sof + 25] << 8) | data[sof + 26]) >> 6;
-/* w8 */
-       avg_lum += ((data[sof + 37] << 8) | data[sof + 38]) >> 6;
-/* w5 */
-       avg_lum += ((data[sof + 31] << 8) | data[sof + 32]) >> 4;
-       avg_lum >>= 4;
-       atomic_set(&sd->avg_lum, avg_lum);
+       if (sd->ag_cnt >= 0)
+               set_lum(sd, data + sof + 2);
 }
 
 static int sd_set_jcomp(struct gspca_dev *gspca_dev,