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[ALSA] pcm: add snd_pcm_rate_to_rate_bit() helper

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Add a snd_pcm_rate_to_rate_bit() function to factor out common code used
by several drivers.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Clemens Ladisch
2007-08-13 17:40:54 +02:00
committed by Jaroslav Kysela
parent 7653d55760
commit 918f3a0e8c
8 changed files with 47 additions and 145 deletions
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49
sound/soc/codecs/cs4270.c
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@@ -55,35 +55,6 @@ struct cs4270_private {
static unsigned int mclk_ratios[NUM_MCLK_RATIOS] =
{64, 96, 128, 192, 256, 384, 512, 768, 1024};
/*
* Sampling rate <-> bit patter mapping
*
* This array maps sampling rates to their SNDRV_PCM_RATE_x equivalent.
*
* This is really something that ALSA should provide.
*
* This table is used by cs4270_set_dai_sysclk() to tell ALSA which sampling
* rates the CS4270 currently supports.
*/
static struct {
unsigned int rate;
unsigned int bit;
} rate_map[] = {
{5512, SNDRV_PCM_RATE_5512},
{8000, SNDRV_PCM_RATE_8000},
{11025, SNDRV_PCM_RATE_11025},
{16000, SNDRV_PCM_RATE_16000},
{22050, SNDRV_PCM_RATE_22050},
{32000, SNDRV_PCM_RATE_32000},
{44100, SNDRV_PCM_RATE_44100},
{48000, SNDRV_PCM_RATE_48000},
{64000, SNDRV_PCM_RATE_64000},
{88200, SNDRV_PCM_RATE_88200},
{96000, SNDRV_PCM_RATE_96000},
{176400, SNDRV_PCM_RATE_176400},
{192000, SNDRV_PCM_RATE_192000}
};
/*
* Determine the CS4270 samples rates.
*
@@ -126,19 +97,15 @@ static int cs4270_set_dai_sysclk(struct snd_soc_codec_dai *codec_dai,
cs4270->mclk = freq;
for (i = 0; i < NUM_MCLK_RATIOS; i++) {
unsigned int rate;
unsigned int j;
rate = freq / mclk_ratios[i];
for (j = 0; j < ARRAY_SIZE(rate_map); j++) {
if (rate == rate_map[j].rate) {
rates |= rate_map[j].bit;
if (rate < rate_min)
rate_min = rate;
if (rate > rate_max)
rate_max = rate;
}
}
unsigned int rate = freq / mclk_ratios[i];
rates |= snd_pcm_rate_to_rate_bit(rate);
if (rate < rate_min)
rate_min = rate;
if (rate > rate_max)
rate_max = rate;
}
/* FIXME: soc should support a rate list */
rates &= ~SNDRV_PCM_RATE_KNOT;
if (!rates) {
printk(KERN_ERR "cs4270: could not find a valid sample rate\n");