v4.19.13 snapshot.
diff --git a/drivers/media/usb/gspca/sn9c2028.h b/drivers/media/usb/gspca/sn9c2028.h
new file mode 100644
index 0000000..29f1571
--- /dev/null
+++ b/drivers/media/usb/gspca/sn9c2028.h
@@ -0,0 +1,58 @@
+/*
+ * SN9C2028 common functions
+ *
+ * Copyright (C) 2009 Theodore Kilgore <kilgota@auburn,edu>
+ *
+ * Based closely upon the file gspca/pac_common.h
+ *
+ * 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.
+ *
+ */
+
+static const unsigned char sn9c2028_sof_marker[] = {
+ 0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96,
+ 0x00,
+ 0x00, /* seq */
+ 0x00,
+ 0x00,
+ 0x00, /* avg luminance lower 8 bit */
+ 0x00, /* avg luminance higher 8 bit */
+};
+
+static unsigned char *sn9c2028_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] == sn9c2028_sof_marker[sd->sof_read]) ||
+ (sd->sof_read > 5)) {
+ sd->sof_read++;
+ if (sd->sof_read == 11)
+ sd->avg_lum_l = m[i];
+ if (sd->sof_read == 12)
+ sd->avg_lum = (m[i] << 8) + sd->avg_lum_l;
+ if (sd->sof_read == sizeof(sn9c2028_sof_marker)) {
+ gspca_dbg(gspca_dev, D_FRAM,
+ "SOF found, bytes to analyze: %u - Frame starts at byte #%u\n",
+ len, i + 1);
+ sd->sof_read = 0;
+ return m + i + 1;
+ }
+ } else {
+ sd->sof_read = 0;
+ }
+ }
+
+ return NULL;
+}