at91: at91sam9g45 family: identify several chip versions
[linux-2.6/next.git] / sound / pci / emu10k1 / voice.c
blob20b8da250bd087190717e0f9774f9e8939e20a79
1 /*
2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
3 * Creative Labs, Inc.
4 * Lee Revell <rlrevell@joe-job.com>
5 * Routines for control of EMU10K1 chips - voice manager
7 * Rewrote voice allocator for multichannel support - rlrevell 12/2004
8 *
9 * BUGS:
10 * --
12 * TODO:
13 * --
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.
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.
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
31 #include <linux/time.h>
32 #include <sound/core.h>
33 #include <sound/emu10k1.h>
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
47 static int voice_alloc(struct snd_emu10k1 *emu, int type, int number,
48 struct snd_emu10k1_voice **rvoice)
50 struct snd_emu10k1_voice *voice;
51 int i, j, k, first_voice, last_voice, skip;
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) {
57 printk(KERN_DEBUG "i %d j %d next free %d!\n",
58 i, j, emu->next_free_voice);
60 i %= NUM_G;
62 /* stereo voices must be even/odd */
63 if ((number == 2) && (i % 2)) {
64 i++;
65 continue;
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;
76 if (!skip) {
77 /* printk(KERN_DEBUG "allocated voice %d\n", i); */
78 first_voice = i;
79 last_voice = (i + number) % NUM_G;
80 emu->next_free_voice = last_voice;
81 break;
85 if (first_voice == last_voice)
86 return -ENOMEM;
88 for (i = 0; i < number; i++) {
89 voice = &emu->voices[(first_voice + i) % NUM_G];
91 printk(kERN_DEBUG "voice alloc - %i, %i of %i\n",
92 voice->number, idx-first_voice+1, number);
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;
110 *rvoice = &emu->voices[first_voice];
111 return 0;
114 int snd_emu10k1_voice_alloc(struct snd_emu10k1 *emu, int type, int number,
115 struct snd_emu10k1_voice **rvoice)
117 unsigned long flags;
118 int result;
120 if (snd_BUG_ON(!rvoice))
121 return -EINVAL;
122 if (snd_BUG_ON(!number))
123 return -EINVAL;
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;
131 /* free a voice from synth */
132 if (emu->get_synth_voice) {
133 result = emu->get_synth_voice(emu);
134 if (result >= 0) {
135 struct snd_emu10k1_voice *pvoice = &emu->voices[result];
136 pvoice->interrupt = NULL;
137 pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0;
138 pvoice->epcm = NULL;
141 if (result < 0)
142 break;
144 spin_unlock_irqrestore(&emu->voice_lock, flags);
146 return result;
149 EXPORT_SYMBOL(snd_emu10k1_voice_alloc);
151 int snd_emu10k1_voice_free(struct snd_emu10k1 *emu,
152 struct snd_emu10k1_voice *pvoice)
154 unsigned long flags;
156 if (snd_BUG_ON(!pvoice))
157 return -EINVAL;
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;
167 EXPORT_SYMBOL(snd_emu10k1_voice_free);