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/*
* libefiboot - library for the manipulation of EFI boot variables
* Copyright 2012-2018 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of the
* License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include "fix_coverity.h"
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdint.h>
#include <unistd.h>
#include "efiboot.h"
/*
* support for emmc devices
*
* /sys/dev/block/$major:$minor looks like:
* 179:0 -> ../../devices/pci0000:00/0000:00:1c.0/mmc_host/mmc0/mmc0:0001/block/mmcblk0
* 179:1 -> ../../devices/pci0000:00/0000:00:1c.0/mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p1
*
* /sys/dev/block/179:0/device looks like:
* device -> ../../../mmc0:0001
*
* /sys/dev/block/179:1/partition looks like:
* $ cat partition
* 1
*
*/
static ssize_t
parse_emmc(struct device *dev, const char *current, const char *root UNUSED)
{
int rc;
int32_t tosser0, tosser1, tosser2, tosser3, slot_id, partition;
int pos0 = 0, pos1 = 0;
debug("entry");
debug("searching for mmc_host/mmc0/mmc0:0001/block/mmcblk0 or mmc_host/mmc0/mmc0:0001/block/mmcblk0/mmcblk0p1");
rc = sscanf(current, "mmc_host/mmc%d/mmc%d:%d/block/mmcblk%d%n/mmcblk%dp%d%n",
&tosser0, &tosser1, &tosser2, &slot_id,
&pos0, &tosser3, &partition, &pos1);
debug("current:\"%s\" rc:%d pos0:%d pos1:%d\n", current, rc, pos0, pos1);
/*
* If it isn't of that form, it's not one of our emmc devices.
*/
if (rc != 4 && rc != 6)
return 0;
dev->emmc_info.slot_id = slot_id;
dev->interface_type = emmc;
if (rc == 6) {
if (dev->part == -1)
dev->part = partition;
pos0 = pos1;
}
return pos0;
}
static ssize_t
dp_create_emmc(struct device *dev,
uint8_t *buf, ssize_t size, ssize_t off)
{
ssize_t sz;
debug("entry");
sz = efidp_make_emmc(buf + off, size ? size - off : 0,
dev->emmc_info.slot_id);
return sz;
}
static char *
make_part_name(struct device *dev)
{
char *ret = NULL;
ssize_t rc;
if (dev->part < 1)
return NULL;
rc = asprintf(&ret, "%sp%d", dev->disk_name, dev->part);
if (rc < 0) {
efi_error("could not allocate memory");
return NULL;
}
return ret;
}
static enum interface_type emmc_iftypes[] = { emmc, unknown };
struct dev_probe HIDDEN emmc_parser = {
.name = "emmc",
.iftypes = emmc_iftypes,
.flags = DEV_PROVIDES_HD,
.parse = parse_emmc,
.create = dp_create_emmc,
.make_part_name = make_part_name,
};
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