Move more towards making MMC a library. Start to reorganize more to

break out 1-1 SCSI-MMC commands (in mmc_ll_cmds.c) from higher-level
commands which use the lower-level ones.

lib/driver/mmc/mmc_cmd_helper.h

@@ -0,0 +1,64 @@
+/*
+   Copyright (C) 2010 Rocky Bernstein <rocky@gnu.org>
+
+   This program 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 3 of the License, or
+   (at your option) any later version.
+   
+   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, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __CDIO_MMC_CMD_HELPER_H__
+#define __CDIO_MMC_CMD_HELPER_H__
+
+/* Boilerplate initialization code to setup running MMC command.  We
+   assume variables 'p_cdio', 'p_buf', and 'i_size' are previously
+   defined.  It does the following:
+
+   1. Defines a cdb variable, 
+   2  Checks to see if we have a cdio object and can run an MMC command
+   3. zeros the buffer (p_buf) using i_size.
+   4. Sets up the command field of cdb to passed in value mmc_cmd.
+*/
+#define MMC_CMD_SETUP(mmc_cmd)						\
+    mmc_cdb_t cdb = {{0, }};						\
+									\
+    if ( ! p_cdio ) return DRIVER_OP_UNINIT;				\
+    if ( ! p_cdio->op.run_mmc_cmd ) return DRIVER_OP_UNSUPPORTED;	\
+									\
+    memset (p_buf, 0, i_size);						\
+    CDIO_MMC_SET_COMMAND(cdb.field, mmc_cmd)				
+
+/* Boilerplate initialization code to setup running MMC read command
+   needs to set the cdb 16-bit length field. See above
+   comment for MMC_CMD_SETUP.
+*/
+#define MMC_CMD_SETUP_READ16(mmc_cmd)					\
+    MMC_CMD_SETUP(mmc_cmd);						\
+									\
+    /* Setup to read header, to get length of data */			\
+    CDIO_MMC_SET_READ_LENGTH16(cdb.field, i_size)
+
+/* Boilerplate code to run a MMC command. 
+
+   We assume variables 'p_cdio', 'mmc_timeout_ms', 'cdb', 'i_size' and
+   'p_buf' are defined previously.
+
+   'direction' is the SCSI direction (read, write, none) of the
+   command.  
+*/
+#define MMC_RUN_CMD(direction, i_timeout)				\
+    p_cdio->op.run_mmc_cmd(p_cdio->env,					\
+	i_timeout,							\
+	mmc_get_cmd_len(cdb.field[0]),                                  \
+        &cdb,								\
+	direction, i_size, p_buf)
+
+#endif /* __CDIO_MMC_CMD_HELPER_H__ */