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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <dirent.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <libgen.h>
#include <limits.h>
#include <uuid/uuid.h>
#include <ctype.h>
#include "mmc.h"
#include "mmc_cmds.h"
int read_extcsd(int fd, __u8 *ext_csd)
{
int ret = 0;
struct mmc_ioc_cmd idata;
memset(&idata, 0, sizeof(idata));
memset(ext_csd, 0, sizeof(__u8) * 512);
idata.write_flag = 0;
idata.opcode = MMC_SEND_EXT_CSD;
idata.arg = 0;
idata.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
idata.blksz = 512;
idata.blocks = 1;
mmc_ioc_cmd_set_data(idata, ext_csd);
ret = ioctl(fd, MMC_IOC_CMD, &idata);
if (ret)
perror("ioctl");
return ret;
}
int write_extcsd_value(int fd, __u8 index, __u8 value)
{
int ret = 0;
struct mmc_ioc_cmd idata;
memset(&idata, 0, sizeof(idata));
idata.write_flag = 1;
idata.opcode = MMC_SWITCH;
idata.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
(index << 16) |
(value << 8) |
EXT_CSD_CMD_SET_NORMAL;
idata.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
ret = ioctl(fd, MMC_IOC_CMD, &idata);
if (ret)
perror("ioctl");
return ret;
}
int do_read_extcsd(int nargs, char **argv)
{
__u8 ext_csd[512];
int fd, ret;
char *device;
CHECK(nargs != 2, "Usage: mmc </path/to/mmcblkX>\n", exit(1));
device = argv[1];
fd = open(device, O_RDWR);
if (fd < 0) {
perror("open");
exit(1);
}
ret = read_extcsd(fd, ext_csd);
if (ret) {
fprintf(stderr, "Could not read EXT_CSD from %s\n", device);
exit(1);
}
printf("Power ro locking: ");
if (ext_csd[EXT_CSD_BOOT_WP] & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
printf("not possible\n");
else
printf("possible\n");
printf("Permanent ro locking: ");
if (ext_csd[EXT_CSD_BOOT_WP] & EXT_CSD_BOOT_WP_B_PERM_WP_DIS)
printf("not possible\n");
else
printf("possible\n");
printf("ro lock status: ");
if (ext_csd[EXT_CSD_BOOT_WP] & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
printf("locked until next power on\n");
else if (ext_csd[EXT_CSD_BOOT_WP] &
EXT_CSD_BOOT_WP_B_PERM_WP_EN)
printf("locked permanently\n");
else
printf("not locked\n");
return ret;
}
int do_write_extcsd(int nargs, char **argv)
{
__u8 ext_csd[512], value;
int fd, ret;
char *device;
if (nargs != 2) {
fprintf (stderr, "Usage: %s </path/to/mmcblkX>\n",
argv[0]);
exit (1);
}
device = argv[1];
fd = open(device, O_RDWR);
if (fd < 0) {
perror("open");
exit(1);
}
ret = read_extcsd(fd, ext_csd);
if (ret) {
fprintf(stderr, "Could not read EXT_CSD from %s\n", device);
exit(1);
}
value = ext_csd[EXT_CSD_BOOT_WP] |
EXT_CSD_BOOT_WP_B_PWR_WP_EN;
ret = write_extcsd_value(fd, EXT_CSD_BOOT_WP, value);
if (ret) {
fprintf(stderr, "Could not write 0x%02x to "
"EXT_CSD[%d] in %s\n",
value, EXT_CSD_BOOT_WP, device);
exit(1);
}
return ret;
}
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