1 files changed, 60 insertions, 0 deletions

diff --git a/drivers/media/video/gspca/pac_common.h b/drivers/media/video/gspca/pac_common.h
new file mode 100644
index 000000000000..34d4b1494cd5
--- /dev/null
+++ b/drivers/media/video/gspca/pac_common.h
@@ -0,0 +1,60 @@
+/*
+ * Pixart PAC207BCA / PAC73xx common functions
+ *
+ * Copyright (C) 2008 Hans de Goede <j.w.r.degoede@hhs.nl>
+ * Copyright (C) 2005 Thomas Kaiser thomas@kaiser-linux.li
+ * Copyleft (C) 2005 Michel Xhaard mxhaard@magic.fr
+ *
+ * V4L2 by Jean-Francois Moine <http://moinejf.free.fr>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+/* We calculate the autogain at the end of the transfer of a frame, at this
+   moment a frame with the old settings is being transmitted, and a frame is
+   being captured with the old settings. So if we adjust the autogain we must
+   ignore atleast the 2 next frames for the new settings to come into effect
+   before doing any other adjustments */
+#define PAC_AUTOGAIN_IGNORE_FRAMES      3
+
+static const unsigned char pac_sof_marker[5] =
+                { 0xff, 0xff, 0x00, 0xff, 0x96 };
+
+static unsigned char *pac_find_sof(struct gspca_dev *gspca_dev,
+                                        unsigned char *m, int len)
+{
+        struct sd *sd = (struct sd *) gspca_dev;
+        int i;
+
+        /* Search for the SOF marker (fixed part) in the header */
+        for (i = 0; i < len; i++) {
+                if (m[i] == pac_sof_marker[sd->sof_read]) {
+                        sd->sof_read++;
+                        if (sd->sof_read == sizeof(pac_sof_marker)) {
+                                PDEBUG(D_FRAM,
+                                        "SOF found, bytes to analyze: %u."
+                                        " Frame starts at byte #%u",
+                                        len, i + 1);
+                                sd->sof_read = 0;
+                                return m + i + 1;
+                        }
+                } else {
+                        sd->sof_read = 0;
+                }
+        }
+
+        return NULL;
+}