1 files changed, 97 insertions, 0 deletions
diff --git a/src/udev/mtd_probe/probe_smartmedia.c b/src/udev/mtd_probe/probe_smartmedia.c
new file mode 100644
index 0000000..368fab8
--- /dev/null
+++ b/src/udev/mtd_probe/probe_smartmedia.c
@@ -0,0 +1,97 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright © 2010 - Maxim Levitsky
+ *
+ * mtd_probe 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.
+ *
+ * mtd_probe 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 mtd_probe; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA  02110-1301  USA
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <mtd/mtd-user.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "alloc-util.h"
+#include "mtd_probe.h"
+
+static const uint8_t cis_signature[] = {
+        0x01, 0x03, 0xD9, 0x01, 0xFF, 0x18, 0x02, 0xDF, 0x01, 0x20
+};
+
+int probe_smart_media(int mtd_fd, mtd_info_t* info) {
+        int sector_size;
+        int block_size;
+        int size_in_megs;
+        int spare_count;
+        _cleanup_free_ uint8_t *cis_buffer = NULL;
+        int offset;
+        int cis_found = 0;
+
+        cis_buffer = malloc(SM_SECTOR_SIZE);
+        if (!cis_buffer)
+                return log_oom();
+
+        if (info->type != MTD_NANDFLASH)
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "Not marked MTD_NANDFLASH.");
+
+        sector_size = info->writesize;
+        block_size = info->erasesize;
+        size_in_megs = info->size / (1024 * 1024);
+
+        if (!IN_SET(sector_size, SM_SECTOR_SIZE, SM_SMALL_PAGE))
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "Unexpected sector size: %i", sector_size);
+
+        switch (size_in_megs) {
+        case 1:
+        case 2:
+                spare_count = 6;
+                break;
+        case 4:
+                spare_count = 12;
+                break;
+        default:
+                spare_count = 24;
+                break;
+        }
+
+        for (offset = 0; offset < block_size * spare_count; offset += sector_size) {
+                (void) lseek(mtd_fd, SEEK_SET, offset);
+
+                if (read(mtd_fd, cis_buffer, SM_SECTOR_SIZE) == SM_SECTOR_SIZE) {
+                        cis_found = 1;
+                        break;
+                }
+        }
+
+        if (!cis_found)
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "CIS not found");
+
+        if (memcmp(cis_buffer, cis_signature, sizeof(cis_signature)) != 0 &&
+            memcmp(cis_buffer + SM_SMALL_PAGE, cis_signature, sizeof(cis_signature)) != 0)
+                return log_debug_errno(SYNTHETIC_ERRNO(EINVAL),
+                                       "CIS signature didn't match");
+
+        printf("MTD_FTL=smartmedia\n");
+        return 0;
+}