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Clarify the difference betweeen speed as it is defined in the MMC spec

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and drive unit speeds. Add a new mmc routine for the latter.
This commit is contained in:
rocky
2006-04-04 02:06:12 +00:00
parent 380b9322ee
commit edc8056ec9
8 changed files with 105 additions and 20 deletions
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32
lib/driver/mmc.c
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@@ -1,6 +1,6 @@
/* Common Multimedia Command (MMC) routines.
$Id: mmc.c,v 1.31 2006/04/03 19:31:18 rocky Exp $
$Id: mmc.c,v 1.32 2006/04/04 02:06:13 rocky Exp $
Copyright (C) 2004, 2005, 2006 Rocky Bernstein <rocky@panix.com>
@@ -1338,6 +1338,30 @@ mmc_set_blocksize ( const CdIo_t *p_cdio, uint16_t i_blocksize)
}
/*!
Set the drive speed in CD-ROM speed units.
@param p_cdio CD structure set by cdio_open().
@param i_drive_speed speed in CD-ROM speed units. Note this
not Kbytes/sec as would be used in the MMC spec or
in mmc_set_speed(). To convert CD-ROM speed units
to Kbs, multiply the number by 176 (for raw data)
and by 150 (for filesystem data). On many CD-ROM
drives, specifying a value too large will result
in using the fastest speed.
@return the drive speed if greater than 0. -1 if we had an error. is -2
returned if this is not implemented for the current driver.
@see cdio_set_speed and mmc_set_speed
*/
driver_return_code_t
mmc_set_drive_speed( const CdIo_t *p_cdio, int i_drive_speed )
{
return mmc_set_speed(p_cdio, i_drive_speed * 176);
}
/*!
Set the drive speed.
@@ -1345,7 +1369,7 @@ mmc_set_blocksize ( const CdIo_t *p_cdio, uint16_t i_blocksize)
returned if this is not implemented for the current driver.
*/
int
mmc_set_speed( const CdIo_t *p_cdio, int i_speed )
mmc_set_speed( const CdIo_t *p_cdio, int i_Kbs_speed )
{
uint8_t buf[14] = { 0, };
@@ -1355,11 +1379,11 @@ mmc_set_speed( const CdIo_t *p_cdio, int i_speed )
will return an error - it's part of the ATAPI specs. Therefore,
test and stop early. */
if ( i_speed < 1 ) return -1;
if ( i_Kbs_speed < 176 ) return -1;
memset(&cdb, 0, sizeof(mmc_cdb_t));
CDIO_MMC_SET_COMMAND(cdb.field, CDIO_MMC_GPCMD_SET_SPEED);
CDIO_MMC_SET_LEN16(cdb.field, 2, i_speed);
CDIO_MMC_SET_LEN16(cdb.field, 2, i_Kbs_speed);
/* Some drives like the Creative 24x CDRW require one to set a
nonzero write speed or else one gets an error back. Some
specifications have setting the value 0xfffff indicate setting to