{"AIFTX", NULL, "Digital CH4 Mux"},
};
-static int nau8540_clock_check(struct nau8540 *nau8540, int rate, int osr)
+static const struct nau8540_osr_attr *
+nau8540_get_osr(struct nau8540 *nau8540)
{
+ unsigned int osr;
+
+ regmap_read(nau8540->regmap, NAU8540_REG_ADC_SAMPLE_RATE, &osr);
+ osr &= NAU8540_ADC_OSR_MASK;
if (osr >= ARRAY_SIZE(osr_adc_sel))
- return -EINVAL;
+ return NULL;
+ return &osr_adc_sel[osr];
+}
+
+static int nau8540_dai_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_component *component = dai->component;
+ struct nau8540 *nau8540 = snd_soc_component_get_drvdata(component);
+ const struct nau8540_osr_attr *osr;
- if (rate * osr > CLK_ADC_MAX) {
- dev_err(nau8540->dev, "exceed the maximum frequency of CLK_ADC\n");
+ osr = nau8540_get_osr(nau8540);
+ if (!osr || !osr->osr)
return -EINVAL;
- }
- return 0;
+ return snd_pcm_hw_constraint_minmax(substream->runtime,
+ SNDRV_PCM_HW_PARAM_RATE,
+ 0, CLK_ADC_MAX / osr->osr);
}
static int nau8540_hw_params(struct snd_pcm_substream *substream,
{
struct snd_soc_component *component = dai->component;
struct nau8540 *nau8540 = snd_soc_component_get_drvdata(component);
- unsigned int val_len = 0, osr;
+ unsigned int val_len = 0;
+ const struct nau8540_osr_attr *osr;
/* CLK_ADC = OSR * FS
* ADC clock frequency is defined as Over Sampling Rate (OSR)
* values must be selected such that the maximum frequency is less
* than 6.144 MHz.
*/
- regmap_read(nau8540->regmap, NAU8540_REG_ADC_SAMPLE_RATE, &osr);
- osr &= NAU8540_ADC_OSR_MASK;
- if (nau8540_clock_check(nau8540, params_rate(params), osr))
+ osr = nau8540_get_osr(nau8540);
+ if (!osr || !osr->osr)
+ return -EINVAL;
+ if (params_rate(params) * osr->osr > CLK_ADC_MAX)
return -EINVAL;
regmap_update_bits(nau8540->regmap, NAU8540_REG_CLOCK_SRC,
NAU8540_CLK_ADC_SRC_MASK,
- osr_adc_sel[osr].clk_src << NAU8540_CLK_ADC_SRC_SFT);
+ osr->clk_src << NAU8540_CLK_ADC_SRC_SFT);
switch (params_width(params)) {
case 16:
static const struct snd_soc_dai_ops nau8540_dai_ops = {
+ .startup = nau8540_dai_startup,
.hw_params = nau8540_hw_params,
.set_fmt = nau8540_set_fmt,
.set_tdm_slot = nau8540_set_tdm_slot,