1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * SN9C2028 common functions
5 * Copyright (C) 2009 Theodore Kilgore <kilgota@auburn,edu>
7 * Based closely upon the file gspca/pac_common.h
10 static const unsigned char sn9c2028_sof_marker[] = {
11 0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96,
16 0x00, /* avg luminance lower 8 bit */
17 0x00, /* avg luminance higher 8 bit */
20 static unsigned char *sn9c2028_find_sof(struct gspca_dev *gspca_dev,
21 unsigned char *m, int len)
23 struct sd *sd = (struct sd *) gspca_dev;
26 /* Search for the SOF marker (fixed part) in the header */
27 for (i = 0; i < len; i++) {
28 if ((m[i] == sn9c2028_sof_marker[sd->sof_read]) ||
31 if (sd->sof_read == 11)
33 if (sd->sof_read == 12)
34 sd->avg_lum = (m[i] << 8) + sd->avg_lum_l;
35 if (sd->sof_read == sizeof(sn9c2028_sof_marker)) {
36 gspca_dbg(gspca_dev, D_FRAM,
37 "SOF found, bytes to analyze: %u - Frame starts at byte #%u\n",