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-rw-r--r--sys/i386/isa/sound/sb_mixer.c359
1 files changed, 359 insertions, 0 deletions
diff --git a/sys/i386/isa/sound/sb_mixer.c b/sys/i386/isa/sound/sb_mixer.c
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+
+/*
+ * sound/sb_mixer.c
+ *
+ * The low level mixer driver for the SoundBlaster Pro and SB16 cards.
+ *
+ * Copyright by Hannu Savolainen 1993
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer. 2.
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#include "sound_config.h"
+
+#if defined(CONFIGURE_SOUNDCARD) && !defined(EXCLUDE_SB) && !defined(EXCLUDE_SBPRO)
+#define __SB_MIXER_C__
+
+#include "sb.h"
+#include "sb_mixer.h"
+#undef SB_TEST_IRQ
+
+extern int sbc_base;
+
+static int mixer_initialized = 0;
+
+static int supported_rec_devices;
+static int supported_devices;
+static int recmask = 0;
+static int mixer_model;
+static int mixer_caps;
+static mixer_tab *iomap;
+
+void
+sb_setmixer (unsigned int port, unsigned int value)
+{
+ unsigned long flags;
+
+ DISABLE_INTR (flags);
+ OUTB ((unsigned char) (port & 0xff), MIXER_ADDR); /* Select register */
+ tenmicrosec ();
+ OUTB ((unsigned char) (value & 0xff), MIXER_DATA);
+ tenmicrosec ();
+ RESTORE_INTR (flags);
+}
+
+int
+sb_getmixer (unsigned int port)
+{
+ int val;
+ unsigned long flags;
+
+ DISABLE_INTR (flags);
+ OUTB ((unsigned char) (port & 0xff), MIXER_ADDR); /* Select register */
+ tenmicrosec ();
+ val = INB (MIXER_DATA);
+ tenmicrosec ();
+ RESTORE_INTR (flags);
+
+ return val;
+}
+
+void
+sb_mixer_set_stereo (int mode)
+{
+ if (!mixer_initialized)
+ return;
+
+ sb_setmixer (OUT_FILTER, ((sb_getmixer (OUT_FILTER) & ~STEREO_DAC)
+ | (mode ? STEREO_DAC : MONO_DAC)));
+}
+
+static int
+detect_mixer (void)
+{
+ /*
+ * Detect the mixer by changing parameters of two volume channels. If the
+ * values read back match with the values written, the mixer is there (is
+ * it?)
+ */
+ sb_setmixer (FM_VOL, 0xff);
+ sb_setmixer (VOC_VOL, 0x33);
+
+ if (sb_getmixer (FM_VOL) != 0xff)
+ return 0; /* No match */
+ if (sb_getmixer (VOC_VOL) != 0x33)
+ return 0;
+
+ return 1;
+}
+
+static void
+change_bits (unsigned char *regval, int dev, int chn, int newval)
+{
+ unsigned char mask;
+ int shift;
+
+ mask = (1 << (*iomap)[dev][chn].nbits) - 1;
+ newval = ((newval * mask) + 50) / 100; /* Scale it */
+
+ shift = (*iomap)[dev][chn].bitoffs - (*iomap)[dev][LEFT_CHN].nbits + 1;
+
+ *regval &= ~(mask << shift); /* Filter out the previous value */
+ *regval |= (newval & mask) << shift; /* Set the new value */
+}
+
+static int
+sb_mixer_get (int dev)
+{
+ if (!((1 << dev) & supported_devices))
+ return RET_ERROR (EINVAL);
+
+ return levels[dev];
+}
+
+static int
+sb_mixer_set (int dev, int value)
+{
+ int left = value & 0x000000ff;
+ int right = (value & 0x0000ff00) >> 8;
+
+ int regoffs;
+ unsigned char val;
+
+ if (left > 100)
+ left = 100;
+ if (right > 100)
+ right = 100;
+
+ if (dev > 31)
+ return RET_ERROR (EINVAL);
+
+ if (!(supported_devices & (1 << dev))) /* Not supported */
+ return RET_ERROR (EINVAL);
+
+ regoffs = (*iomap)[dev][LEFT_CHN].regno;
+
+ if (regoffs == 0)
+ return RET_ERROR (EINVAL);
+
+ val = sb_getmixer (regoffs);
+ change_bits (&val, dev, LEFT_CHN, left);
+
+ levels[dev] = left | (left << 8);
+
+ if ((*iomap)[dev][RIGHT_CHN].regno != regoffs) /* Change register */
+ {
+ sb_setmixer (regoffs, val); /* Save the old one */
+ regoffs = (*iomap)[dev][RIGHT_CHN].regno;
+
+ if (regoffs == 0)
+ return left | (left << 8); /* Just left channel present */
+
+ val = sb_getmixer (regoffs); /* Read the new one */
+ }
+
+ change_bits (&val, dev, RIGHT_CHN, right);
+ sb_setmixer (regoffs, val);
+
+ levels[dev] = left | (right << 8);
+ return left | (right << 8);
+}
+
+static void
+set_recsrc (int src)
+{
+ sb_setmixer (RECORD_SRC, (sb_getmixer (RECORD_SRC) & ~7) | (src & 0x7));
+}
+
+static int
+set_recmask (int mask)
+{
+ int devmask, i;
+ unsigned char regimageL, regimageR;
+
+ devmask = mask & supported_rec_devices;
+
+ switch (mixer_model)
+ {
+ case 3:
+
+ if (devmask != SOUND_MASK_MIC &&
+ devmask != SOUND_MASK_LINE &&
+ devmask != SOUND_MASK_CD)
+ { /* More than one devices selected. Drop the
+ * previous selection */
+ devmask &= ~recmask;
+ }
+
+ if (devmask != SOUND_MASK_MIC &&
+ devmask != SOUND_MASK_LINE &&
+ devmask != SOUND_MASK_CD)
+ { /* More than one devices selected. Default to
+ * mic */
+ devmask = SOUND_MASK_MIC;
+ }
+
+
+ if (devmask ^ recmask) /* Input source changed */
+ {
+ switch (devmask)
+ {
+
+ case SOUND_MASK_MIC:
+ set_recsrc (SRC_MIC);
+ break;
+
+ case SOUND_MASK_LINE:
+ set_recsrc (SRC_LINE);
+ break;
+
+ case SOUND_MASK_CD:
+ set_recsrc (SRC_CD);
+ break;
+
+ default:
+ set_recsrc (SRC_MIC);
+ }
+ }
+
+ break;
+
+ case 4:
+ if (!devmask)
+ devmask = SOUND_MASK_MIC;
+
+ regimageL = regimageR = 0;
+ for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
+ if ((1 << i) & devmask)
+ {
+ regimageL |= sb16_recmasks_L[i];
+ regimageR |= sb16_recmasks_R[i];
+ }
+ sb_setmixer (SB16_IMASK_L, regimageL);
+ sb_setmixer (SB16_IMASK_R, regimageR);
+ break;
+ }
+
+ recmask = devmask;
+ return recmask;
+}
+
+static int
+sb_mixer_ioctl (int dev, unsigned int cmd, unsigned int arg)
+{
+ if (((cmd >> 8) & 0xff) == 'M')
+ {
+ if (cmd & IOC_IN)
+ switch (cmd & 0xff)
+ {
+ case SOUND_MIXER_RECSRC:
+ return IOCTL_OUT (arg, set_recmask (IOCTL_IN (arg)));
+ break;
+
+ default:
+ return IOCTL_OUT (arg, sb_mixer_set (cmd & 0xff, IOCTL_IN (arg)));
+ }
+ else
+ switch (cmd & 0xff) /* Return parameters */
+ {
+
+ case SOUND_MIXER_RECSRC:
+ return IOCTL_OUT (arg, recmask);
+ break;
+
+ case SOUND_MIXER_DEVMASK:
+ return IOCTL_OUT (arg, supported_devices);
+ break;
+
+ case SOUND_MIXER_STEREODEVS:
+ return IOCTL_OUT (arg, supported_devices &
+ ~(SOUND_MASK_MIC | SOUND_MASK_SPEAKER));
+ break;
+
+ case SOUND_MIXER_RECMASK:
+ return IOCTL_OUT (arg, supported_rec_devices);
+ break;
+
+ case SOUND_MIXER_CAPS:
+ return IOCTL_OUT (arg, mixer_caps);
+ break;
+
+ default:
+ return IOCTL_OUT (arg, sb_mixer_get (cmd & 0xff));
+ }
+ }
+ else
+ return RET_ERROR (EINVAL);
+}
+
+static struct mixer_operations sb_mixer_operations =
+{
+ sb_mixer_ioctl
+};
+
+static void
+sb_mixer_reset (void)
+{
+ int i;
+
+ for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
+ sb_mixer_set (i, levels[i]);
+ set_recmask (SOUND_MASK_MIC);
+}
+
+void
+sb_mixer_init (int major_model)
+{
+ sb_setmixer (0x00, 0); /* Reset mixer */
+
+ if (!detect_mixer ())
+ return; /* No mixer. Why? */
+
+ mixer_initialized = 1;
+ mixer_model = major_model;
+
+ switch (major_model)
+ {
+ case 3:
+ mixer_caps = SOUND_CAP_EXCL_INPUT;
+ supported_devices = SBPRO_MIXER_DEVICES;
+ supported_rec_devices = SBPRO_RECORDING_DEVICES;
+ iomap = &sbpro_mix;
+ break;
+
+ case 4:
+ mixer_caps = 0;
+ supported_devices = SB16_MIXER_DEVICES;
+ supported_rec_devices = SB16_RECORDING_DEVICES;
+ iomap = &sb16_mix;
+ break;
+
+ default:
+ printk ("SB Warning: Unsupported mixer type\n");
+ return;
+ }
+
+ mixer_devs[num_mixers++] = &sb_mixer_operations;
+ sb_mixer_reset ();
+}
+
+#endif
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