lib/smbios/mosys_callbacks.c

/* Copyright 2012 Google LLC
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above
 *      copyright notice, this list of conditions and the following
 *      disclaimer in the documentation and/or other materials provided
 *      with the distribution.
 *    * Neither the name of Google LLC nor the names of its
 *      contributors may be used to endorse or promote products derived
 *      from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>

#include "mosys/alloc.h"
#include "mosys/kv_pair.h"
#include "mosys/log.h"
#include "mosys/platform.h"

#include "lib/file.h"
#include "lib/smbios.h"
#include "lib/smbios_tables.h"

#define	SYSFS_SMBIOS_DIR	"/sys/class/dmi/id"

/*
 * smbios_scan_sysfs - scan for a SMBIOS entry by filename and return its value
 *
 * @filename:	filename to scan for
 *
 * Note: User must remember to free allocated memory
 *
 * returns pointer to allocated memory containing SMBIOS info
 * returns NULL if not found
 */
static char *smbios_scan_sysfs(const char *filename)
{
	ssize_t bytes_read;
	char path[PATH_MAX];
	char contents[SMBIOS_MAX_STRING_LENGTH + 1];

	snprintf(path, sizeof(path), SYSFS_SMBIOS_DIR "/%s", filename);
	bytes_read = read_file(path, contents, sizeof(contents), LOG_DEBUG);
	if (bytes_read <= 0)
		return NULL;

	/* Trim off trailing newline, if there is one. */
	if (contents[bytes_read - 1] == '\n')
		contents[bytes_read - 1] = '\0';

	return mosys_strdup(contents);
}

/*
 * smbios_sysinfo_get_vendor  -  return platform vendor
 *
 * @intf:       platform interface
 *
 * returns pointer to allocated platform vendor string
 * returns NULL if not found
 */
char *smbios_sysinfo_get_vendor(struct platform_intf *intf)
{
	return smbios_scan_sysfs("sys_vendor");
}

/*
 * smbios_sysinfo_get_version  -  return platform version
 *
 * @intf:       platform interface
 *
 * returns pointer to allocated platform version string
 * returns NULL if not found
 */
char *smbios_sysinfo_get_version(struct platform_intf *intf)
{
	return smbios_scan_sysfs("product_version");
}

/*
 * Memory callbacks
 */

/*
 * smbios_dimm_count  -  return total number of dimm slots
 *
 * @intf:       platform interface
 *
 * returns dimm slot count
 */
int smbios_dimm_count(struct platform_intf *intf)
{
	int status = 0, dimm_cnt = 0;
	struct smbios_table table;

	while (status == 0) {
		status = smbios_find_table(intf, SMBIOS_TYPE_MEMORY, dimm_cnt,
					   &table);
		if (status == 0)
			dimm_cnt++;
	}

	return dimm_cnt;
}