File indexing completed on 2024-04-21 08:44:22

 /*
  * This file is part of WorkMan, the civilized CD player library
  * Copyright (C) 1991-1997 by Steven Grimm (original author)
  * Copyright (C) by Dirk Försterling <milliByte@DeathsDoor.com>
  * Copyright (C) 2004-2006 Alexander Kern <alex.kern@gmx.de>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library 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
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public
  * License along with this library; if not, write to the Free
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  *
  *
  * Vendor-specific drive control routines for Toshiba XM-3401 series.
  */
 
 #include <stdio.h>
 #include <errno.h>
 #include "include/wm_config.h"
 #include "include/wm_struct.h"
 #include "include/wm_scsi.h"
 
 #define SCMD_TOSH_EJECT 0xc4
 
 /* local prototypes */
 /* static int min_volume = 0, max_volume = 255; */
 
 /*
  * Undo the transformation above using a binary search (so no floating-point
  * math is required.)
  */
 static int unscale_volume(int cd_vol, int max)
 {
     int vol = 0, top = max, bot = 0, scaled = 0;
 
     /*cd_vol = (cd_vol * 100 + (max_volume - 1)) / max_volume;*/
 
     while (bot <= top)
     {
         vol = (top + bot) / 2;
         scaled = (vol * vol) / max;
         if (cd_vol <= scaled)
             top = vol - 1;
         else
             bot = vol + 1;
     }
 
     /* Might have looked down too far for repeated scaled values */
     if (cd_vol < scaled)
         vol++;
 
     if (vol < 0)
         vol = 0;
     else if (vol > max)
         vol = max;
 
     return (vol);
 }
 
 /*
  * Send the Toshiba code to eject the CD.
  */
 static int tosh_eject(struct wm_drive *d)
 {
     return sendscsi(d, NULL, 0, 0, SCMD_TOSH_EJECT, 1, 0,0,0,0,0,0,0,0,0,0);
 }
 
 /*
  * Set the volume.  The low end of the scale is more sensitive than the high
  * end, so make up for that by transforming the volume parameters to a square
  * curve.
  */
 static int tosh_scale_volume(int *left, int *right)
 {
     *left = (*left * *left * *left) / 10000;
     *right = (*right * *right * *right) / 10000;
 
     return 0;
 }
 
 static int tosh_unscale_volume(int *left, int *right)
 {
     *left = unscale_volume(*left, 100);
     *right = unscale_volume(*right, 100);
 
     return 0;
 }
 
 int toshiba_fixup(struct wm_drive *d)
 {
     d->proto.eject = tosh_eject;
     d->proto.scale_volume = tosh_scale_volume;
     d->proto.unscale_volume = tosh_unscale_volume;
 
     return 0;
 }