blob: 101e7cb79cb260dd8f669cda3f952e5ad64a18b2 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Jaroslav Kyselac1017a42007-10-15 09:50:19 +02002 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/time.h>
Paul Gortmakerd81a6d72011-09-22 09:34:58 -040032#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <sound/core.h>
34#include <sound/emu10k1.h>
35
36/* Previously the voice allocator started at 0 every time. The new voice
37 * allocator uses a round robin scheme. The next free voice is tracked in
38 * the card record and each allocation begins where the last left off. The
39 * hardware requires stereo interleaved voices be aligned to an even/odd
40 * boundary. For multichannel voice allocation we ensure than the block of
41 * voices does not cross the 32 voice boundary. This simplifies the
42 * multichannel support and ensures we can use a single write to the
43 * (set|clear)_loop_stop registers. Otherwise (for example) the voices would
44 * get out of sync when pausing/resuming a stream.
45 * --rlrevell
46 */
47
Takashi Iwaieb4698f2005-11-17 14:50:13 +010048static int voice_alloc(struct snd_emu10k1 *emu, int type, int number,
49 struct snd_emu10k1_voice **rvoice)
Linus Torvalds1da177e2005-04-16 15:20:36 -070050{
Takashi Iwaieb4698f2005-11-17 14:50:13 +010051 struct snd_emu10k1_voice *voice;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 int i, j, k, first_voice, last_voice, skip;
53
54 *rvoice = NULL;
55 first_voice = last_voice = 0;
56 for (i = emu->next_free_voice, j = 0; j < NUM_G ; i += number, j += number) {
Takashi Iwai28a97c12009-02-05 16:08:14 +010057 /*
58 printk(KERN_DEBUG "i %d j %d next free %d!\n",
59 i, j, emu->next_free_voice);
60 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 i %= NUM_G;
62
63 /* stereo voices must be even/odd */
64 if ((number == 2) && (i % 2)) {
65 i++;
66 continue;
67 }
68
69 skip = 0;
70 for (k = 0; k < number; k++) {
71 voice = &emu->voices[(i+k) % NUM_G];
72 if (voice->use) {
73 skip = 1;
74 break;
75 }
76 }
77 if (!skip) {
Takashi Iwai28a97c12009-02-05 16:08:14 +010078 /* printk(KERN_DEBUG "allocated voice %d\n", i); */
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 first_voice = i;
80 last_voice = (i + number) % NUM_G;
81 emu->next_free_voice = last_voice;
82 break;
83 }
84 }
85
86 if (first_voice == last_voice)
87 return -ENOMEM;
88
James Courtier-Dutton9f4bd5d2006-10-01 10:48:04 +010089 for (i = 0; i < number; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 voice = &emu->voices[(first_voice + i) % NUM_G];
Takashi Iwai28a97c12009-02-05 16:08:14 +010091 /*
92 printk(kERN_DEBUG "voice alloc - %i, %i of %i\n",
93 voice->number, idx-first_voice+1, number);
94 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 voice->use = 1;
96 switch (type) {
97 case EMU10K1_PCM:
98 voice->pcm = 1;
99 break;
100 case EMU10K1_SYNTH:
101 voice->synth = 1;
102 break;
103 case EMU10K1_MIDI:
104 voice->midi = 1;
105 break;
106 case EMU10K1_EFX:
107 voice->efx = 1;
108 break;
109 }
110 }
111 *rvoice = &emu->voices[first_voice];
112 return 0;
113}
114
Takashi Iwaieb4698f2005-11-17 14:50:13 +0100115int snd_emu10k1_voice_alloc(struct snd_emu10k1 *emu, int type, int number,
116 struct snd_emu10k1_voice **rvoice)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117{
118 unsigned long flags;
119 int result;
120
Takashi Iwaida3cec32008-08-08 17:12:14 +0200121 if (snd_BUG_ON(!rvoice))
122 return -EINVAL;
123 if (snd_BUG_ON(!number))
124 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126 spin_lock_irqsave(&emu->voice_lock, flags);
127 for (;;) {
128 result = voice_alloc(emu, type, number, rvoice);
129 if (result == 0 || type == EMU10K1_SYNTH || type == EMU10K1_MIDI)
130 break;
131
132 /* free a voice from synth */
133 if (emu->get_synth_voice) {
134 result = emu->get_synth_voice(emu);
135 if (result >= 0) {
Takashi Iwaieb4698f2005-11-17 14:50:13 +0100136 struct snd_emu10k1_voice *pvoice = &emu->voices[result];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 pvoice->interrupt = NULL;
138 pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0;
139 pvoice->epcm = NULL;
140 }
141 }
142 if (result < 0)
143 break;
144 }
145 spin_unlock_irqrestore(&emu->voice_lock, flags);
146
147 return result;
148}
149
Takashi Iwai2dd31de2006-04-28 15:13:39 +0200150EXPORT_SYMBOL(snd_emu10k1_voice_alloc);
151
Takashi Iwaieb4698f2005-11-17 14:50:13 +0100152int snd_emu10k1_voice_free(struct snd_emu10k1 *emu,
153 struct snd_emu10k1_voice *pvoice)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154{
155 unsigned long flags;
156
Takashi Iwaida3cec32008-08-08 17:12:14 +0200157 if (snd_BUG_ON(!pvoice))
158 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 spin_lock_irqsave(&emu->voice_lock, flags);
160 pvoice->interrupt = NULL;
161 pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0;
162 pvoice->epcm = NULL;
163 snd_emu10k1_voice_init(emu, pvoice->number);
164 spin_unlock_irqrestore(&emu->voice_lock, flags);
165 return 0;
166}
Takashi Iwai2dd31de2006-04-28 15:13:39 +0200167
168EXPORT_SYMBOL(snd_emu10k1_voice_free);