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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program 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 general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
155 lines
3.9 KiB
C
155 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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* Creative Labs, Inc.
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* Lee Revell <rlrevell@joe-job.com>
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* Routines for control of EMU10K1 chips - voice manager
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*
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* Rewrote voice allocator for multichannel support - rlrevell 12/2004
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*
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* BUGS:
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* --
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*
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* TODO:
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* --
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*/
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#include <linux/time.h>
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#include <linux/export.h>
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#include <sound/core.h>
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#include <sound/emu10k1.h>
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/* Previously the voice allocator started at 0 every time. The new voice
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* allocator uses a round robin scheme. The next free voice is tracked in
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* the card record and each allocation begins where the last left off. The
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* hardware requires stereo interleaved voices be aligned to an even/odd
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* boundary. For multichannel voice allocation we ensure than the block of
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* voices does not cross the 32 voice boundary. This simplifies the
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* multichannel support and ensures we can use a single write to the
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* (set|clear)_loop_stop registers. Otherwise (for example) the voices would
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* get out of sync when pausing/resuming a stream.
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* --rlrevell
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*/
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static int voice_alloc(struct snd_emu10k1 *emu, int type, int number,
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struct snd_emu10k1_voice **rvoice)
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{
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struct snd_emu10k1_voice *voice;
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int i, j, k, first_voice, last_voice, skip;
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*rvoice = NULL;
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first_voice = last_voice = 0;
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for (i = emu->next_free_voice, j = 0; j < NUM_G ; i += number, j += number) {
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/*
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dev_dbg(emu->card->dev, "i %d j %d next free %d!\n",
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i, j, emu->next_free_voice);
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*/
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i %= NUM_G;
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/* stereo voices must be even/odd */
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if ((number == 2) && (i % 2)) {
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i++;
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continue;
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}
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skip = 0;
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for (k = 0; k < number; k++) {
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voice = &emu->voices[(i+k) % NUM_G];
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if (voice->use) {
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skip = 1;
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break;
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}
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}
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if (!skip) {
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/* dev_dbg(emu->card->dev, "allocated voice %d\n", i); */
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first_voice = i;
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last_voice = (i + number) % NUM_G;
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emu->next_free_voice = last_voice;
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break;
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}
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}
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if (first_voice == last_voice)
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return -ENOMEM;
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for (i = 0; i < number; i++) {
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voice = &emu->voices[(first_voice + i) % NUM_G];
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/*
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dev_dbg(emu->card->dev, "voice alloc - %i, %i of %i\n",
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voice->number, idx-first_voice+1, number);
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*/
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voice->use = 1;
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switch (type) {
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case EMU10K1_PCM:
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voice->pcm = 1;
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break;
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case EMU10K1_SYNTH:
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voice->synth = 1;
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break;
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case EMU10K1_MIDI:
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voice->midi = 1;
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break;
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case EMU10K1_EFX:
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voice->efx = 1;
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break;
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}
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}
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*rvoice = &emu->voices[first_voice];
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return 0;
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}
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int snd_emu10k1_voice_alloc(struct snd_emu10k1 *emu, int type, int number,
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struct snd_emu10k1_voice **rvoice)
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{
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unsigned long flags;
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int result;
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if (snd_BUG_ON(!rvoice))
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return -EINVAL;
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if (snd_BUG_ON(!number))
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return -EINVAL;
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spin_lock_irqsave(&emu->voice_lock, flags);
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for (;;) {
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result = voice_alloc(emu, type, number, rvoice);
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if (result == 0 || type == EMU10K1_SYNTH || type == EMU10K1_MIDI)
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break;
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/* free a voice from synth */
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if (emu->get_synth_voice) {
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result = emu->get_synth_voice(emu);
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if (result >= 0) {
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struct snd_emu10k1_voice *pvoice = &emu->voices[result];
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pvoice->interrupt = NULL;
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pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0;
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pvoice->epcm = NULL;
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}
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}
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if (result < 0)
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break;
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}
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spin_unlock_irqrestore(&emu->voice_lock, flags);
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return result;
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}
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EXPORT_SYMBOL(snd_emu10k1_voice_alloc);
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int snd_emu10k1_voice_free(struct snd_emu10k1 *emu,
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struct snd_emu10k1_voice *pvoice)
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{
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unsigned long flags;
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if (snd_BUG_ON(!pvoice))
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return -EINVAL;
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spin_lock_irqsave(&emu->voice_lock, flags);
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pvoice->interrupt = NULL;
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pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0;
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pvoice->epcm = NULL;
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snd_emu10k1_voice_init(emu, pvoice->number);
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spin_unlock_irqrestore(&emu->voice_lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(snd_emu10k1_voice_free);
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