[ALSA] pcm: add snd_pcm_rate_to_rate_bit() helper
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>
diff --git a/sound/soc/codecs/cs4270.c b/sound/soc/codecs/cs4270.c
index 8beae65..43d50a4 100644
--- a/sound/soc/codecs/cs4270.c
+++ b/sound/soc/codecs/cs4270.c
@@ -56,35 +56,6 @@
{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.
*
* 'freq' is the input frequency to MCLK. The other parameters are ignored.
@@ -126,19 +97,15 @@
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");