alistair23-linux/sound/pci/emu10k1/voice.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *                   Creative Labs, Inc.
 *                   Lee Revell <rlrevell@joe-job.com>
 *  Routines for control of EMU10K1 chips - voice manager
 *
 *  Rewrote voice allocator for multichannel support - rlrevell 12/2004
 * 
 *  BUGS:
 *    --
 *
 *  TODO:
 *    --
 */

#include <linux/time.h>
#include <linux/export.h>
#include <sound/core.h>
#include <sound/emu10k1.h>

/* Previously the voice allocator started at 0 every time.  The new voice 
 * allocator uses a round robin scheme.  The next free voice is tracked in 
 * the card record and each allocation begins where the last left off.  The 
 * hardware requires stereo interleaved voices be aligned to an even/odd 
 * boundary.  For multichannel voice allocation we ensure than the block of 
 * voices does not cross the 32 voice boundary.  This simplifies the 
 * multichannel support and ensures we can use a single write to the 
 * (set|clear)_loop_stop registers.  Otherwise (for example) the voices would 
 * get out of sync when pausing/resuming a stream.
 *							--rlrevell
 */

static int voice_alloc(struct snd_emu10k1 *emu, int type, int number,
		       struct snd_emu10k1_voice **rvoice)
{
	struct snd_emu10k1_voice *voice;
	int i, j, k, first_voice, last_voice, skip;

	*rvoice = NULL;
	first_voice = last_voice = 0;
	for (i = emu->next_free_voice, j = 0; j < NUM_G ; i += number, j += number) {
		/*
		dev_dbg(emu->card->dev, "i %d j %d next free %d!\n",
		       i, j, emu->next_free_voice);
		*/
		i %= NUM_G;

		/* stereo voices must be even/odd */
		if ((number == 2) && (i % 2)) {
			i++;
			continue;
		}
			
		skip = 0;
		for (k = 0; k < number; k++) {
			voice = &emu->voices[(i+k) % NUM_G];
			if (voice->use) {
				skip = 1;
				break;
			}
		}
		if (!skip) {
			/* dev_dbg(emu->card->dev, "allocated voice %d\n", i); */
			first_voice = i;
			last_voice = (i + number) % NUM_G;
			emu->next_free_voice = last_voice;
			break;
		}
	}
	
	if (first_voice == last_voice)
		return -ENOMEM;
	
	for (i = 0; i < number; i++) {
		voice = &emu->voices[(first_voice + i) % NUM_G];
		/*
		dev_dbg(emu->card->dev, "voice alloc - %i, %i of %i\n",
		       voice->number, idx-first_voice+1, number);
		*/
		voice->use = 1;
		switch (type) {
		case EMU10K1_PCM:
			voice->pcm = 1;
			break;
		case EMU10K1_SYNTH:
			voice->synth = 1;
			break;
		case EMU10K1_MIDI:
			voice->midi = 1;
			break;
		case EMU10K1_EFX:
			voice->efx = 1;
			break;
		}
	}
	*rvoice = &emu->voices[first_voice];
	return 0;
}

int snd_emu10k1_voice_alloc(struct snd_emu10k1 *emu, int type, int number,
			    struct snd_emu10k1_voice **rvoice)
{
	unsigned long flags;
	int result;

	if (snd_BUG_ON(!rvoice))
		return -EINVAL;
	if (snd_BUG_ON(!number))
		return -EINVAL;

	spin_lock_irqsave(&emu->voice_lock, flags);
	for (;;) {
		result = voice_alloc(emu, type, number, rvoice);
		if (result == 0 || type == EMU10K1_SYNTH || type == EMU10K1_MIDI)
			break;

		/* free a voice from synth */
		if (emu->get_synth_voice) {
			result = emu->get_synth_voice(emu);
			if (result >= 0) {
				struct snd_emu10k1_voice *pvoice = &emu->voices[result];
				pvoice->interrupt = NULL;
				pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0;
				pvoice->epcm = NULL;
			}
		}
		if (result < 0)
			break;
	}
	spin_unlock_irqrestore(&emu->voice_lock, flags);

	return result;
}

EXPORT_SYMBOL(snd_emu10k1_voice_alloc);

int snd_emu10k1_voice_free(struct snd_emu10k1 *emu,
			   struct snd_emu10k1_voice *pvoice)
{
	unsigned long flags;

	if (snd_BUG_ON(!pvoice))
		return -EINVAL;
	spin_lock_irqsave(&emu->voice_lock, flags);
	pvoice->interrupt = NULL;
	pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0;
	pvoice->epcm = NULL;
	snd_emu10k1_voice_init(emu, pvoice->number);
	spin_unlock_irqrestore(&emu->voice_lock, flags);
	return 0;
}

EXPORT_SYMBOL(snd_emu10k1_voice_free);