mmc-utils: Merge the lsmmc tool into mmc-utils

The lsmmc tools contains an extensive parser of the CID, CSD, SCR
registers from userspace. The utility works as-is and uses sysfs
to read the register values.

The original code is created by Sebastian Rasmussen and still lives
in an attachment in the mail archive of linux-mmc. It need to be merged
into mmc-utils repository, which is convenient for testing MMC device
from userspace.

Change since v3:
 - Remove the unused EXT_CSD parser in lsmmc.c file.
Signed-off-by: Sebastian Rasmussen <sebras@gmail.com>
Signed-off-by: Chris Ball <chris@printf.net>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>

Makefile

@@ -4,6 +4,7 @@ CFLAGS ?= -g -O2
 objects = \
 	mmc.o \
 	mmc_cmds.o \
+	lsmmc.o \
 	3rdparty/hmac_sha/hmac_sha2.o \
 	3rdparty/hmac_sha/sha2.o
 

mmc.c

@@ -175,6 +175,24 @@ static struct Command commands[] = {
 		"NOTE! The cache is an optional feature on devices >= eMMC4.5.",
 	  NULL
 	},
+	{ do_read_csd, -1,
+	  "csd read", "<device path>\n"
+		  "Print CSD data from <device path>.\n"
+		  "The device path should specify the csd file directory.",
+	  NULL
+	},
+	{ do_read_cid, -1,
+	  "cid read", "<device path>\n"
+		  "Print CID data from <device path>.\n"
+		  "The device path should specify the cid file directory.",
+	  NULL
+	},
+	{ do_read_scr, -1,
+	  "scr read", "<device path>\n"
+		  "Print SCR data from <device path>.\n"
+		  "The device path should specify the scr file directory.",
+	  NULL
+	},
 	{ 0, 0, 0, 0 }
 };
 

mmc_cmds.h

@@ -36,3 +36,6 @@ int do_rpmb_read_block(int nargs, char **argv);
 int do_rpmb_write_block(int nargs, char **argv);
 int do_cache_en(int nargs, char **argv);
 int do_cache_dis(int nargs, char **argv);
+int do_read_scr(int argc, char **argv);
+int do_read_cid(int argc, char **argv);
+int do_read_csd(int argc, char **argv);