2 # Copyright (c) 2016 Landon Fuller <landon@landonf.org>
5 # Redistribution and use in source and binary forms, with or without
6 # modification, are permitted provided that the following conditions
8 # 1. Redistributions of source code must retain the above copyright
9 # notice, this list of conditions and the following disclaimer.
10 # 2. Redistributions in binary form must reproduce the above copyright
11 # notice, this list of conditions and the following disclaimer in the
12 # documentation and/or other materials provided with the distribution.
14 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 # IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
18 # INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
20 # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
21 # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
22 # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
23 # USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 #include <sys/types.h>
30 #include <dev/bhnd/bhnd.h>
35 # bhnd(4) NVRAM device interface.
37 # Provides a shared interface to HND NVRAM, OTP, and SPROM devices that provide
38 # access to a common set of hardware/device configuration variables.
42 * Read an NVRAM variable.
44 * @param dev The NVRAM device.
45 * @param name The NVRAM variable name.
46 * @param[out] buf On success, the requested value will be written
47 * to this buffer. This argment may be NULL if
48 * the value is not desired.
49 * @param[in,out] size The capacity of @p buf. On success, will be set
50 * to the actual size of the requested value.
53 * @retval ENOENT The requested variable was not found.
54 * @retval ENOMEM If @p buf is non-NULL and a buffer of @p size is too
55 * small to hold the requested value.
56 * @retval non-zero If reading @p name otherwise fails, a regular unix
57 * error code will be returned.