[deliverable/linux.git] / sound / pci / emu10k1 / voice.c

/*
 *  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:
 *    --
 *
 *   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 <linux/time.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) {
		/*
		printk(KERN_DEBUG "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) {
			/* printk(KERN_DEBUG "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];
		/*
		printk(kERN_DEBUG "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);
Commit	Line	Data
1da177e4	1	/*
c1017a4c	2	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4 LT	3	* Creative Labs, Inc.
	4	* Lee Revell <rlrevell@joe-job.com>
	5	* Routines for control of EMU10K1 chips - voice manager
	6	*
	7	* Rewrote voice allocator for multichannel support - rlrevell 12/2004
	8	*
	9	* BUGS:
	10	* --
	11	*
	12	* TODO:
	13	* --
	14	*
	15	* This program is free software; you can redistribute it and/or modify
	16	* it under the terms of the GNU General Public License as published by
	17	* the Free Software Foundation; either version 2 of the License, or
	18	* (at your option) any later version.
	19	*
	20	* This program is distributed in the hope that it will be useful,
	21	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	22	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	23	* GNU General Public License for more details.
	24	*
	25	* You should have received a copy of the GNU General Public License
	26	* along with this program; if not, write to the Free Software
	27	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	28	*
	29	*/
	30
1da177e4 LT	31	#include <linux/time.h>
	32	#include <sound/core.h>
	33	#include <sound/emu10k1.h>
	34
	35	/* Previously the voice allocator started at 0 every time. The new voice
	36	* allocator uses a round robin scheme. The next free voice is tracked in
	37	* the card record and each allocation begins where the last left off. The
	38	* hardware requires stereo interleaved voices be aligned to an even/odd
	39	* boundary. For multichannel voice allocation we ensure than the block of
	40	* voices does not cross the 32 voice boundary. This simplifies the
	41	* multichannel support and ensures we can use a single write to the
	42	* (set\|clear)_loop_stop registers. Otherwise (for example) the voices would
	43	* get out of sync when pausing/resuming a stream.
	44	* --rlrevell
	45	*/
	46
eb4698f3 TI	47	static int voice_alloc(struct snd_emu10k1 *emu, int type, int number,
eb4698f3 TI	48	struct snd_emu10k1_voice **rvoice)
1da177e4	49	{
eb4698f3	50	struct snd_emu10k1_voice *voice;
1da177e4 LT	51	int i, j, k, first_voice, last_voice, skip;
	52
	53	*rvoice = NULL;
	54	first_voice = last_voice = 0;
	55	for (i = emu->next_free_voice, j = 0; j < NUM_G ; i += number, j += number) {
28a97c19 TI	56	/*
	57	printk(KERN_DEBUG "i %d j %d next free %d!\n",
	58	i, j, emu->next_free_voice);
	59	*/
1da177e4 LT	60	i %= NUM_G;
	61
	62	/* stereo voices must be even/odd */
	63	if ((number == 2) && (i % 2)) {
	64	i++;
	65	continue;
	66	}
	67
	68	skip = 0;
	69	for (k = 0; k < number; k++) {
	70	voice = &emu->voices[(i+k) % NUM_G];
	71	if (voice->use) {
	72	skip = 1;
	73	break;
	74	}
	75	}
	76	if (!skip) {
28a97c19	77	/* printk(KERN_DEBUG "allocated voice %d\n", i); */
1da177e4 LT	78	first_voice = i;
	79	last_voice = (i + number) % NUM_G;
	80	emu->next_free_voice = last_voice;
	81	break;
	82	}
	83	}
	84
	85	if (first_voice == last_voice)
	86	return -ENOMEM;
	87
9f4bd5dd	88	for (i = 0; i < number; i++) {
1da177e4	89	voice = &emu->voices[(first_voice + i) % NUM_G];
28a97c19 TI	90	/*
	91	printk(kERN_DEBUG "voice alloc - %i, %i of %i\n",
	92	voice->number, idx-first_voice+1, number);
	93	*/
1da177e4 LT	94	voice->use = 1;
	95	switch (type) {
	96	case EMU10K1_PCM:
	97	voice->pcm = 1;
	98	break;
	99	case EMU10K1_SYNTH:
	100	voice->synth = 1;
	101	break;
	102	case EMU10K1_MIDI:
	103	voice->midi = 1;
	104	break;
	105	case EMU10K1_EFX:
	106	voice->efx = 1;
	107	break;
	108	}
	109	}
	110	*rvoice = &emu->voices[first_voice];
	111	return 0;
	112	}
	113
eb4698f3 TI	114	int snd_emu10k1_voice_alloc(struct snd_emu10k1 *emu, int type, int number,
eb4698f3 TI	115	struct snd_emu10k1_voice **rvoice)
1da177e4 LT	116	{
	117	unsigned long flags;
	118	int result;
	119
da3cec35 TI	120	if (snd_BUG_ON(!rvoice))
	121	return -EINVAL;
	122	if (snd_BUG_ON(!number))
	123	return -EINVAL;
1da177e4 LT	124
	125	spin_lock_irqsave(&emu->voice_lock, flags);
	126	for (;;) {
	127	result = voice_alloc(emu, type, number, rvoice);
	128	if (result == 0 \|\| type == EMU10K1_SYNTH \|\| type == EMU10K1_MIDI)
	129	break;
	130
	131	/* free a voice from synth */
	132	if (emu->get_synth_voice) {
	133	result = emu->get_synth_voice(emu);
	134	if (result >= 0) {
eb4698f3	135	struct snd_emu10k1_voice *pvoice = &emu->voices[result];
1da177e4 LT	136	pvoice->interrupt = NULL;
	137	pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0;
	138	pvoice->epcm = NULL;
	139	}
	140	}
	141	if (result < 0)
	142	break;
	143	}
	144	spin_unlock_irqrestore(&emu->voice_lock, flags);
	145
	146	return result;
	147	}
	148
2dd31dee TI	149	EXPORT_SYMBOL(snd_emu10k1_voice_alloc);
2dd31dee TI	150
eb4698f3 TI	151	int snd_emu10k1_voice_free(struct snd_emu10k1 *emu,
eb4698f3 TI	152	struct snd_emu10k1_voice *pvoice)
1da177e4 LT	153	{
	154	unsigned long flags;
	155
da3cec35 TI	156	if (snd_BUG_ON(!pvoice))
da3cec35 TI	157	return -EINVAL;
1da177e4 LT	158	spin_lock_irqsave(&emu->voice_lock, flags);
	159	pvoice->interrupt = NULL;
	160	pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0;
	161	pvoice->epcm = NULL;
	162	snd_emu10k1_voice_init(emu, pvoice->number);
	163	spin_unlock_irqrestore(&emu->voice_lock, flags);
	164	return 0;
	165	}
2dd31dee TI	166
2dd31dee TI	167	EXPORT_SYMBOL(snd_emu10k1_voice_free);