1 files changed, 534 insertions, 0 deletions
diff --git a/sound/isa/sb/emu8000_callback.c b/sound/isa/sb/emu8000_callback.c
new file mode 100644
index 000000000..7609a5b64
--- /dev/null
+++ b/sound/isa/sb/emu8000_callback.c
@@ -0,0 +1,534 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *  synth callback routines for the emu8000 (AWE32/64)
+ *
+ *  Copyright (C) 1999 Steve Ratcliffe
+ *  Copyright (C) 1999-2000 Takashi Iwai <tiwai@suse.de>
+ */
+
+#include "emu8000_local.h"
+#include <linux/export.h>
+#include <sound/asoundef.h>
+
+/*
+ * prototypes
+ */
+static struct snd_emux_voice *get_voice(struct snd_emux *emu,
+					struct snd_emux_port *port);
+static int start_voice(struct snd_emux_voice *vp);
+static void trigger_voice(struct snd_emux_voice *vp);
+static void release_voice(struct snd_emux_voice *vp);
+static void update_voice(struct snd_emux_voice *vp, int update);
+static void reset_voice(struct snd_emux *emu, int ch);
+static void terminate_voice(struct snd_emux_voice *vp);
+static void sysex(struct snd_emux *emu, char *buf, int len, int parsed,
+		  struct snd_midi_channel_set *chset);
+#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
+static int oss_ioctl(struct snd_emux *emu, int cmd, int p1, int p2);
+#endif
+static int load_fx(struct snd_emux *emu, int type, int mode,
+		   const void __user *buf, long len);
+
+static void set_pitch(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
+static void set_volume(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
+static void set_pan(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
+static void set_fmmod(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
+static void set_tremfreq(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
+static void set_fm2frq2(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
+static void set_filterQ(struct snd_emu8000 *hw, struct snd_emux_voice *vp);
+static void snd_emu8000_tweak_voice(struct snd_emu8000 *emu, int ch);
+
+/*
+ * Ensure a value is between two points
+ * macro evaluates its args more than once, so changed to upper-case.
+ */
+#define LIMITVALUE(x, a, b) do { if ((x) < (a)) (x) = (a); else if ((x) > (b)) (x) = (b); } while (0)
+#define LIMITMAX(x, a) do {if ((x) > (a)) (x) = (a); } while (0)
+
+
+/*
+ * set up operators
+ */
+static const struct snd_emux_operators emu8000_ops = {
+	.owner =	THIS_MODULE,
+	.get_voice =	get_voice,
+	.prepare =	start_voice,
+	.trigger =	trigger_voice,
+	.release =	release_voice,
+	.update =	update_voice,
+	.terminate =	terminate_voice,
+	.reset =	reset_voice,
+	.sample_new =	snd_emu8000_sample_new,
+	.sample_free =	snd_emu8000_sample_free,
+	.sample_reset = snd_emu8000_sample_reset,
+	.load_fx =	load_fx,
+	.sysex =	sysex,
+#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
+	.oss_ioctl =	oss_ioctl,
+#endif
+};
+
+void
+snd_emu8000_ops_setup(struct snd_emu8000 *hw)
+{
+	hw->emu->ops = emu8000_ops;
+}
+
+
+
+/*
+ * Terminate a voice
+ */
+static void
+release_voice(struct snd_emux_voice *vp)
+{
+	int dcysusv;
+	struct snd_emu8000 *hw;
+
+	hw = vp->hw;
+	dcysusv = 0x8000 | (unsigned char)vp->reg.parm.modrelease;
+	EMU8000_DCYSUS_WRITE(hw, vp->ch, dcysusv);
+	dcysusv = 0x8000 | (unsigned char)vp->reg.parm.volrelease;
+	EMU8000_DCYSUSV_WRITE(hw, vp->ch, dcysusv);
+}
+
+
+/*
+ */
+static void
+terminate_voice(struct snd_emux_voice *vp)
+{
+	struct snd_emu8000 *hw; 
+
+	hw = vp->hw;
+	EMU8000_DCYSUSV_WRITE(hw, vp->ch, 0x807F);
+}
+
+
+/*
+ */
+static void
+update_voice(struct snd_emux_voice *vp, int update)
+{
+	struct snd_emu8000 *hw;
+
+	hw = vp->hw;
+	if (update & SNDRV_EMUX_UPDATE_VOLUME)
+		set_volume(hw, vp);
+	if (update & SNDRV_EMUX_UPDATE_PITCH)
+		set_pitch(hw, vp);
+	if ((update & SNDRV_EMUX_UPDATE_PAN) &&
+	    vp->port->ctrls[EMUX_MD_REALTIME_PAN])
+		set_pan(hw, vp);
+	if (update & SNDRV_EMUX_UPDATE_FMMOD)
+		set_fmmod(hw, vp);
+	if (update & SNDRV_EMUX_UPDATE_TREMFREQ)
+		set_tremfreq(hw, vp);
+	if (update & SNDRV_EMUX_UPDATE_FM2FRQ2)
+		set_fm2frq2(hw, vp);
+	if (update & SNDRV_EMUX_UPDATE_Q)
+		set_filterQ(hw, vp);
+}
+
+
+/*
+ * Find a channel (voice) within the EMU that is not in use or at least
+ * less in use than other channels.  Always returns a valid pointer
+ * no matter what.  If there is a real shortage of voices then one
+ * will be cut. Such is life.
+ *
+ * The channel index (vp->ch) must be initialized in this routine.
+ * In Emu8k, it is identical with the array index.
+ */
+static struct snd_emux_voice *
+get_voice(struct snd_emux *emu, struct snd_emux_port *port)
+{
+	int  i;
+	struct snd_emux_voice *vp;
+	struct snd_emu8000 *hw;
+
+	/* what we are looking for, in order of preference */
+	enum {
+		OFF=0, RELEASED, PLAYING, END
+	};
+
+	/* Keeps track of what we are finding */
+	struct best {
+		unsigned int  time;
+		int voice;
+	} best[END];
+	struct best *bp;
+
+	hw = emu->hw;
+
+	for (i = 0; i < END; i++) {
+		best[i].time = (unsigned int)(-1); /* XXX MAX_?INT really */
+		best[i].voice = -1;
+	}
+
+	/*
+	 * Go through them all and get a best one to use.
+	 */
+	for (i = 0; i < emu->max_voices; i++) {
+		int state, val;
+
+		vp = &emu->voices[i];
+		state = vp->state;
+
+		if (state == SNDRV_EMUX_ST_OFF)
+			bp = best + OFF;
+		else if (state == SNDRV_EMUX_ST_RELEASED ||
+			 state == SNDRV_EMUX_ST_PENDING) {
+			bp = best + RELEASED;
+			val = (EMU8000_CVCF_READ(hw, vp->ch) >> 16) & 0xffff;
+			if (! val)
+				bp = best + OFF;
+		}
+		else if (state & SNDRV_EMUX_ST_ON)
+			bp = best + PLAYING;
+		else
+			continue;
+
+		/* check if sample is finished playing (non-looping only) */
+		if (state != SNDRV_EMUX_ST_OFF &&
+		    (vp->reg.sample_mode & SNDRV_SFNT_SAMPLE_SINGLESHOT)) {
+			val = EMU8000_CCCA_READ(hw, vp->ch) & 0xffffff;
+			if (val >= vp->reg.loopstart)
+				bp = best + OFF;
+		}
+
+		if (vp->time < bp->time) {
+			bp->time = vp->time;
+			bp->voice = i;
+		}
+	}
+
+	for (i = 0; i < END; i++) {
+		if (best[i].voice >= 0) {
+			vp = &emu->voices[best[i].voice];
+			vp->ch = best[i].voice;
+			return vp;
+		}
+	}
+
+	/* not found */
+	return NULL;
+}
+
+/*
+ */
+static int
+start_voice(struct snd_emux_voice *vp)
+{
+	unsigned int temp;
+	int ch;
+	int addr;
+	struct snd_midi_channel *chan;
+	struct snd_emu8000 *hw;
+
+	hw = vp->hw;
+	ch = vp->ch;
+	chan = vp->chan;
+
+	/* channel to be silent and idle */
+	EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080);
+	EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF);
+	EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF);
+	EMU8000_PTRX_WRITE(hw, ch, 0);
+	EMU8000_CPF_WRITE(hw, ch, 0);
+
+	/* set pitch offset */
+	set_pitch(hw, vp);
+
+	/* set envelope parameters */
+	EMU8000_ENVVAL_WRITE(hw, ch, vp->reg.parm.moddelay);
+	EMU8000_ATKHLD_WRITE(hw, ch, vp->reg.parm.modatkhld);
+	EMU8000_DCYSUS_WRITE(hw, ch, vp->reg.parm.moddcysus);
+	EMU8000_ENVVOL_WRITE(hw, ch, vp->reg.parm.voldelay);
+	EMU8000_ATKHLDV_WRITE(hw, ch, vp->reg.parm.volatkhld);
+	/* decay/sustain parameter for volume envelope is used
+	   for triggerg the voice */
+
+	/* cutoff and volume */
+	set_volume(hw, vp);
+
+	/* modulation envelope heights */
+	EMU8000_PEFE_WRITE(hw, ch, vp->reg.parm.pefe);
+
+	/* lfo1/2 delay */
+	EMU8000_LFO1VAL_WRITE(hw, ch, vp->reg.parm.lfo1delay);
+	EMU8000_LFO2VAL_WRITE(hw, ch, vp->reg.parm.lfo2delay);
+
+	/* lfo1 pitch & cutoff shift */
+	set_fmmod(hw, vp);
+	/* lfo1 volume & freq */
+	set_tremfreq(hw, vp);
+	/* lfo2 pitch & freq */
+	set_fm2frq2(hw, vp);
+	/* pan & loop start */
+	set_pan(hw, vp);
+
+	/* chorus & loop end (chorus 8bit, MSB) */
+	addr = vp->reg.loopend - 1;
+	temp = vp->reg.parm.chorus;
+	temp += (int)chan->control[MIDI_CTL_E3_CHORUS_DEPTH] * 9 / 10;
+	LIMITMAX(temp, 255);
+	temp = (temp <<24) | (unsigned int)addr;
+	EMU8000_CSL_WRITE(hw, ch, temp);
+
+	/* Q & current address (Q 4bit value, MSB) */
+	addr = vp->reg.start - 1;
+	temp = vp->reg.parm.filterQ;
+	temp = (temp<<28) | (unsigned int)addr;
+	EMU8000_CCCA_WRITE(hw, ch, temp);
+
+	/* clear unknown registers */
+	EMU8000_00A0_WRITE(hw, ch, 0);
+	EMU8000_0080_WRITE(hw, ch, 0);
+
+	/* reset volume */
+	temp = vp->vtarget << 16;
+	EMU8000_VTFT_WRITE(hw, ch, temp | vp->ftarget);
+	EMU8000_CVCF_WRITE(hw, ch, temp | 0xff00);
+
+	return 0;
+}
+
+/*
+ * Start envelope
+ */
+static void
+trigger_voice(struct snd_emux_voice *vp)
+{
+	int ch = vp->ch;
+	unsigned int temp;
+	struct snd_emu8000 *hw;
+
+	hw = vp->hw;
+
+	/* set reverb and pitch target */
+	temp = vp->reg.parm.reverb;
+	temp += (int)vp->chan->control[MIDI_CTL_E1_REVERB_DEPTH] * 9 / 10;
+	LIMITMAX(temp, 255);
+	temp = (temp << 8) | (vp->ptarget << 16) | vp->aaux;
+	EMU8000_PTRX_WRITE(hw, ch, temp);
+	EMU8000_CPF_WRITE(hw, ch, vp->ptarget << 16);
+	EMU8000_DCYSUSV_WRITE(hw, ch, vp->reg.parm.voldcysus);
+}
+
+/*
+ * reset voice parameters
+ */
+static void
+reset_voice(struct snd_emux *emu, int ch)
+{
+	struct snd_emu8000 *hw;
+
+	hw = emu->hw;
+	EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F);
+	snd_emu8000_tweak_voice(hw, ch);
+}
+
+/*
+ * Set the pitch of a possibly playing note.
+ */
+static void
+set_pitch(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
+{
+	EMU8000_IP_WRITE(hw, vp->ch, vp->apitch);
+}
+
+/*
+ * Set the volume of a possibly already playing note
+ */
+static void
+set_volume(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
+{
+	int  ifatn;
+
+	ifatn = (unsigned char)vp->acutoff;
+	ifatn = (ifatn << 8);
+	ifatn |= (unsigned char)vp->avol;
+	EMU8000_IFATN_WRITE(hw, vp->ch, ifatn);
+}
+
+/*
+ * Set pan and loop start address.
+ */
+static void
+set_pan(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
+{
+	unsigned int temp;
+
+	temp = ((unsigned int)vp->apan<<24) | ((unsigned int)vp->reg.loopstart - 1);
+	EMU8000_PSST_WRITE(hw, vp->ch, temp);
+}
+
+#define MOD_SENSE 18
+
+static void
+set_fmmod(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
+{
+	unsigned short fmmod;
+	short pitch;
+	unsigned char cutoff;
+	int modulation;
+
+	pitch = (char)(vp->reg.parm.fmmod>>8);
+	cutoff = (vp->reg.parm.fmmod & 0xff);
+	modulation = vp->chan->gm_modulation + vp->chan->midi_pressure;
+	pitch += (MOD_SENSE * modulation) / 1200;
+	LIMITVALUE(pitch, -128, 127);
+	fmmod = ((unsigned char)pitch<<8) | cutoff;
+	EMU8000_FMMOD_WRITE(hw, vp->ch, fmmod);
+}
+
+/* set tremolo (lfo1) volume & frequency */
+static void
+set_tremfreq(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
+{
+	EMU8000_TREMFRQ_WRITE(hw, vp->ch, vp->reg.parm.tremfrq);
+}
+
+/* set lfo2 pitch & frequency */
+static void
+set_fm2frq2(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
+{
+	unsigned short fm2frq2;
+	short pitch;
+	unsigned char freq;
+	int modulation;
+
+	pitch = (char)(vp->reg.parm.fm2frq2>>8);
+	freq = vp->reg.parm.fm2frq2 & 0xff;
+	modulation = vp->chan->gm_modulation + vp->chan->midi_pressure;
+	pitch += (MOD_SENSE * modulation) / 1200;
+	LIMITVALUE(pitch, -128, 127);
+	fm2frq2 = ((unsigned char)pitch<<8) | freq;
+	EMU8000_FM2FRQ2_WRITE(hw, vp->ch, fm2frq2);
+}
+
+/* set filterQ */
+static void
+set_filterQ(struct snd_emu8000 *hw, struct snd_emux_voice *vp)
+{
+	unsigned int addr;
+	addr = EMU8000_CCCA_READ(hw, vp->ch) & 0xffffff;
+	addr |= (vp->reg.parm.filterQ << 28);
+	EMU8000_CCCA_WRITE(hw, vp->ch, addr);
+}
+
+/*
+ * set the envelope & LFO parameters to the default values
+ */
+static void
+snd_emu8000_tweak_voice(struct snd_emu8000 *emu, int i)
+{
+	/* set all mod/vol envelope shape to minimum */
+	EMU8000_ENVVOL_WRITE(emu, i, 0x8000);
+	EMU8000_ENVVAL_WRITE(emu, i, 0x8000);
+	EMU8000_DCYSUS_WRITE(emu, i, 0x7F7F);
+	EMU8000_ATKHLDV_WRITE(emu, i, 0x7F7F);
+	EMU8000_ATKHLD_WRITE(emu, i, 0x7F7F);
+	EMU8000_PEFE_WRITE(emu, i, 0);  /* mod envelope height to zero */
+	EMU8000_LFO1VAL_WRITE(emu, i, 0x8000); /* no delay for LFO1 */
+	EMU8000_LFO2VAL_WRITE(emu, i, 0x8000);
+	EMU8000_IP_WRITE(emu, i, 0xE000);	/* no pitch shift */
+	EMU8000_IFATN_WRITE(emu, i, 0xFF00);	/* volume to minimum */
+	EMU8000_FMMOD_WRITE(emu, i, 0);
+	EMU8000_TREMFRQ_WRITE(emu, i, 0);
+	EMU8000_FM2FRQ2_WRITE(emu, i, 0);
+}
+
+/*
+ * sysex callback
+ */
+static void
+sysex(struct snd_emux *emu, char *buf, int len, int parsed, struct snd_midi_channel_set *chset)
+{
+	struct snd_emu8000 *hw;
+
+	hw = emu->hw;
+
+	switch (parsed) {
+	case SNDRV_MIDI_SYSEX_GS_CHORUS_MODE:
+		hw->chorus_mode = chset->gs_chorus_mode;
+		snd_emu8000_update_chorus_mode(hw);
+		break;
+
+	case SNDRV_MIDI_SYSEX_GS_REVERB_MODE:
+		hw->reverb_mode = chset->gs_reverb_mode;
+		snd_emu8000_update_reverb_mode(hw);
+		break;
+	}
+}
+
+
+#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
+/*
+ * OSS ioctl callback
+ */
+static int
+oss_ioctl(struct snd_emux *emu, int cmd, int p1, int p2)
+{
+	struct snd_emu8000 *hw;
+
+	hw = emu->hw;
+
+	switch (cmd) {
+	case _EMUX_OSS_REVERB_MODE:
+		hw->reverb_mode = p1;
+		snd_emu8000_update_reverb_mode(hw);
+		break;
+
+	case _EMUX_OSS_CHORUS_MODE:
+		hw->chorus_mode = p1;
+		snd_emu8000_update_chorus_mode(hw);
+		break;
+
+	case _EMUX_OSS_INITIALIZE_CHIP:
+		/* snd_emu8000_init(hw); */ /*ignored*/
+		break;
+
+	case _EMUX_OSS_EQUALIZER:
+		hw->bass_level = p1;
+		hw->treble_level = p2;
+		snd_emu8000_update_equalizer(hw);
+		break;
+	}
+	return 0;
+}
+#endif
+
+
+/*
+ * additional patch keys
+ */
+
+#define SNDRV_EMU8000_LOAD_CHORUS_FX	0x10	/* optarg=mode */
+#define SNDRV_EMU8000_LOAD_REVERB_FX	0x11	/* optarg=mode */
+
+
+/*
+ * callback routine
+ */
+
+static int
+load_fx(struct snd_emux *emu, int type, int mode, const void __user *buf, long len)
+{
+	struct snd_emu8000 *hw;
+	hw = emu->hw;
+
+	/* skip header */
+	buf += 16;
+	len -= 16;
+
+	switch (type) {
+	case SNDRV_EMU8000_LOAD_CHORUS_FX:
+		return snd_emu8000_load_chorus_fx(hw, mode, buf, len);
+	case SNDRV_EMU8000_LOAD_REVERB_FX:
+		return snd_emu8000_load_reverb_fx(hw, mode, buf, len);
+	}
+	return -EINVAL;
+}
+