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-rw-r--r--kscd/libwm/drv_sony.c166
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diff --git a/kscd/libwm/drv_sony.c b/kscd/libwm/drv_sony.c
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+/*
+ * $Id$
+ *
+ * This file is part of WorkMan, the civilized CD player library
+ * (c) 1991-1997 by Steven Grimm (original author)
+ * (c) by Dirk Försterling (current 'author' = maintainer)
+ * The maintainer can be contacted by his e-mail address:
+ * milliByte@DeathsDoor.com
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ *
+ * Vendor-specific drive control routines for Sony CDU-8012 series.
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include "include/wm_config.h"
+#include "include/wm_struct.h"
+#include "include/wm_scsi.h"
+
+#define PAGE_AUDIO 0x0e
+
+/* local prototypes */
+static int sony_init( struct wm_drive *d );
+static int sony_set_volume(struct wm_drive *d, int left, int right );
+static int sony_get_volume( struct wm_drive *d, int *left, int *right );
+
+
+extern int min_volume, max_volume;
+
+struct wm_drive_proto sony_proto = {
+ sony_init, /* functions... */
+ gen_close,
+ gen_get_trackcount,
+ gen_get_cdlen,
+ gen_get_trackinfo,
+ gen_get_drive_status,
+ sony_get_volume,
+ sony_set_volume,
+ gen_pause,
+ gen_resume,
+ gen_stop,
+ gen_play,
+ gen_eject,
+ gen_closetray,
+ NULL /* gen_get_cdtext */
+};
+
+/*
+ * Initialize the driver.
+ */
+static int sony_init( struct wm_drive *d ) {
+
+/* Sun use Sony drives as well */
+#if defined(SYSV) && defined(CODEC)
+ codec_init();
+#endif
+ min_volume = 128;
+ max_volume = 255;
+ return( 0 );
+} /* sony_init() */
+
+/*
+ * On the Sony CDU-8012 drive, the amount of sound coming out the jack
+ * increases much faster toward the top end of the volume scale than it
+ * does at the bottom. To make up for this, we make the volume scale look
+ * sort of logarithmic (actually an upside-down inverse square curve) so
+ * that the volume value passed to the drive changes less and less as you
+ * approach the maximum slider setting. Additionally, only the top half
+ * of the volume scale is valid; the bottom half is all silent. The actual
+ * formula looks like
+ *
+ * max^2 - (max - vol)^2 max
+ * v = --------------------- + ---
+ * max * 2 2
+ *
+ * Where "max" is the maximum value of the volume scale, usually 100.
+ */
+static int
+scale_volume(vol, max)
+ int vol, max;
+{
+ vol = (max*max - (max - vol) * (max - vol)) / max;
+ return ((vol + max) / 2);
+}
+
+/*
+ * Given a value between min_volume and max_volume, return the standard-scale
+ * volume value needed to achieve that hardware value.
+ *
+ * Rather than perform floating-point calculations to reverse the above
+ * formula, we simply do a binary search of scale_volume()'s return values.
+ */
+static int
+unscale_volume(cd_vol, max)
+ int cd_vol, 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 = scale_volume(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);
+}
+
+/*
+ * Get the volume. Sun's CD-ROM driver doesn't support this operation, even
+ * though their drive does. Dumb.
+ */
+static int
+sony_get_volume( struct wm_drive *d, int *left, int *right )
+{
+ unsigned char mode[16];
+
+ /* Get the current audio parameters first. */
+ if (wm_scsi_mode_sense(d, PAGE_AUDIO, mode))
+ return (-1);
+
+ *left = unscale_volume(mode[9], 100);
+ *right = unscale_volume(mode[11], 100);
+
+ return (0);
+}
+
+/*
+ * Set the volume using the wacky scale outlined above. The Sony drive
+ * responds to the standard set-volume command.
+ */
+static int
+sony_set_volume(struct wm_drive *d, int left, int right )
+{
+ left = scale_volume(left, 100);
+ right = scale_volume(right, 100);
+ return (gen_set_volume(d, left, right));
+}