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167 lines
4.3 KiB
167 lines
4.3 KiB
/*
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* $Id$
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*
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* This file is part of WorkMan, the civilized CD player library
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* (c) 1991-1997 by Steven Grimm (original author)
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* (c) by Dirk Försterling (current 'author' = maintainer)
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* The maintainer can be contacted by his e-mail address:
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* milliByte@DeathsDoor.com
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*
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* Vendor-specific drive control routines for Sony CDU-8012 series.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include "include/wm_config.h"
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#include "include/wm_struct.h"
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#include "include/wm_scsi.h"
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#define PAGE_AUDIO 0x0e
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/* local prototypes */
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static int sony_init( struct wm_drive *d );
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static int sony_set_volume(struct wm_drive *d, int left, int right );
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static int sony_get_volume( struct wm_drive *d, int *left, int *right );
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extern int min_volume, max_volume;
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struct wm_drive_proto sony_proto = {
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sony_init, /* functions... */
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gen_close,
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gen_get_trackcount,
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gen_get_cdlen,
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gen_get_trackinfo,
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gen_get_drive_status,
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sony_get_volume,
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sony_set_volume,
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gen_pause,
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gen_resume,
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gen_stop,
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gen_play,
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gen_eject,
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gen_closetray,
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NULL /* gen_get_cdtext */
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};
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/*
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* Initialize the driver.
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*/
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static int sony_init( struct wm_drive *d ) {
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/* Sun use Sony drives as well */
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#if defined(SYSV) && defined(CODEC)
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codec_init();
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#endif
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min_volume = 128;
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max_volume = 255;
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return( 0 );
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} /* sony_init() */
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/*
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* On the Sony CDU-8012 drive, the amount of sound coming out the jack
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* increases much faster toward the top end of the volume scale than it
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* does at the bottom. To make up for this, we make the volume scale look
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* sort of logarithmic (actually an upside-down inverse square curve) so
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* that the volume value passed to the drive changes less and less as you
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* approach the maximum slider setting. Additionally, only the top half
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* of the volume scale is valid; the bottom half is all silent. The actual
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* formula looks like
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*
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* max^2 - (max - vol)^2 max
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* v = --------------------- + ---
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* max * 2 2
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*
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* Where "max" is the maximum value of the volume scale, usually 100.
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*/
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static int
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scale_volume(vol, max)
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int vol, max;
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{
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vol = (max*max - (max - vol) * (max - vol)) / max;
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return ((vol + max) / 2);
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}
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/*
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* Given a value between min_volume and max_volume, return the standard-scale
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* volume value needed to achieve that hardware value.
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*
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* Rather than perform floating-point calculations to reverse the above
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* formula, we simply do a binary search of scale_volume()'s return values.
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*/
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static int
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unscale_volume(cd_vol, max)
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int cd_vol, max;
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{
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int vol = 0, top = max, bot = 0, scaled = 0;
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cd_vol = (cd_vol * 100 + (max_volume - 1)) / max_volume;
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while (bot <= top)
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{
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vol = (top + bot) / 2;
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scaled = scale_volume(vol, max);
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if (cd_vol <= scaled)
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top = vol - 1;
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else
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bot = vol + 1;
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}
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/* Might have looked down too far for repeated scaled values */
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if (cd_vol < scaled)
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vol++;
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if (vol < 0)
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vol = 0;
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else if (vol > max)
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vol = max;
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return (vol);
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}
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/*
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* Get the volume. Sun's CD-ROM driver doesn't support this operation, even
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* though their drive does. Dumb.
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*/
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static int
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sony_get_volume( struct wm_drive *d, int *left, int *right )
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{
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unsigned char mode[16];
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/* Get the current audio parameters first. */
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if (wm_scsi_mode_sense(d, PAGE_AUDIO, mode))
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return (-1);
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*left = unscale_volume(mode[9], 100);
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*right = unscale_volume(mode[11], 100);
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return (0);
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}
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/*
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* Set the volume using the wacky scale outlined above. The Sony drive
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* responds to the standard set-volume command.
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*/
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static int
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sony_set_volume(struct wm_drive *d, int left, int right )
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{
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left = scale_volume(left, 100);
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right = scale_volume(right, 100);
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return (gen_set_volume(d, left, right));
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}
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