/lib/firmware/carl9170fw/carlfw/include/uart.h is in linux-firmware 1.127.24.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* carl9170 firmware - used by the ar9170 wireless device
*
* UART functions definition
*
* Copyright (c) 2000-2005 ZyDAS Technology Corporation
* Copyright (c) 2007-2009 Atheros Communications, Inc.
* Copyright 2009 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2009-2011 Christian Lamparter <chunkeey@googlemail.com>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef __CARL9170FW_UART_H
#define __CARL9170FW_UART_H
#include "config.h"
#ifdef CONFIG_CARL9170FW_DEBUG_UART
void uart_putc(const char c);
void uart_print_hex_dump(const void *buf, const int len);
void uart_init(void);
#endif /* CONFIG_CARL9170FW_DEBUG_UART */
#endif /* __CARL9170FW_UART_H */
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