| /* |
| * Copyright (c) by Jaroslav Kysela <perex@suse.cz> |
| * Creative Labs, Inc. |
| * Routines for control of EMU10K1 chips - voice manager |
| * |
| * BUGS: |
| * -- |
| * |
| * TODO: |
| * -- |
| * |
| * 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 |
| * |
| */ |
| |
| #include <sound/driver.h> |
| #include <linux/time.h> |
| #include <sound/core.h> |
| #include <sound/emu10k1.h> |
| |
| static int voice_alloc(emu10k1_t *emu, emu10k1_voice_type_t type, int pair, emu10k1_voice_t **rvoice) |
| { |
| emu10k1_voice_t *voice, *voice2; |
| int idx; |
| |
| *rvoice = NULL; |
| for (idx = 0; idx < 64; idx += pair ? 2 : 1) { |
| voice = &emu->voices[idx]; |
| voice2 = pair ? &emu->voices[idx+1] : NULL; |
| if (voice->use || (voice2 && voice2->use)) |
| continue; |
| voice->use = 1; |
| if (voice2) |
| voice2->use = 1; |
| switch (type) { |
| case EMU10K1_PCM: |
| voice->pcm = 1; |
| if (voice2) |
| voice2->pcm = 1; |
| break; |
| case EMU10K1_SYNTH: |
| voice->synth = 1; |
| break; |
| case EMU10K1_MIDI: |
| voice->midi = 1; |
| break; |
| } |
| // printk("voice alloc - %i, pair = %i\n", voice->number, pair); |
| *rvoice = voice; |
| return 0; |
| } |
| return -ENOMEM; |
| } |
| |
| int snd_emu10k1_voice_alloc(emu10k1_t *emu, emu10k1_voice_type_t type, int pair, emu10k1_voice_t **rvoice) |
| { |
| unsigned long flags; |
| int result; |
| |
| snd_assert(rvoice != NULL, return -EINVAL); |
| snd_assert(!pair || type == EMU10K1_PCM, return -EINVAL); |
| |
| spin_lock_irqsave(&emu->voice_lock, flags); |
| for (;;) { |
| result = voice_alloc(emu, type, pair, rvoice); |
| if (result == 0 || type != EMU10K1_PCM) |
| break; |
| |
| /* free a voice from synth */ |
| if (emu->get_synth_voice) { |
| result = emu->get_synth_voice(emu); |
| if (result >= 0) { |
| emu10k1_voice_t *pvoice = &emu->voices[result]; |
| pvoice->interrupt = NULL; |
| pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = 0; |
| pvoice->epcm = NULL; |
| } |
| } |
| if (result < 0) |
| break; |
| } |
| spin_unlock_irqrestore(&emu->voice_lock, flags); |
| |
| return result; |
| } |
| |
| int snd_emu10k1_voice_free(emu10k1_t *emu, emu10k1_voice_t *pvoice) |
| { |
| unsigned long flags; |
| |
| snd_assert(pvoice != NULL, return -EINVAL); |
| spin_lock_irqsave(&emu->voice_lock, flags); |
| pvoice->interrupt = NULL; |
| pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = 0; |
| pvoice->epcm = NULL; |
| snd_emu10k1_voice_init(emu, pvoice->number); |
| spin_unlock_irqrestore(&emu->voice_lock, flags); |
| return 0; |
| } |