[PATCH v2 1/3] ASoC: wm8782: Handle maximum audio rate at runtime

John Watts
2023-09-13T17:16:41Z

The wm8782 supports up to 192kHz audio when pins are set correctly.
Instead of hardcoding which rates are supported enable them all
then refer to a max_rate variable at runtime.

Signed-off-by: John Watts <contact@jookia.org>
---
sound/soc/codecs/wm8782.c | 45 ++++++++++++++++++++++++++++-----------
1 file changed, 33 insertions(+), 12 deletions(-)

diff --git a/sound/soc/codecs/wm8782.c b/sound/soc/codecs/wm8782.c
index 95ff4339d103..63ab63f3189a 100644
--- a/sound/soc/codecs/wm8782.c
+++ b/sound/soc/codecs/wm8782.c
@@ -23,6 +23,30 @@
#include <sound/initval.h>
#include <sound/soc.h>

+/* regulator power supply names */
+static const char *supply_names[] = {
+ "Vdda", /* analog supply, 2.7V - 3.6V */
+ "Vdd", /* digital supply, 2.7V - 5.5V */
+};
+
+struct wm8782_priv {
+ struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
+ int max_rate;
+};
+
+static int wm8782_dai_hw_params(struct snd_pcm_substream *component,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct wm8782_priv *priv =
+ snd_soc_component_get_drvdata(dai->component);
+
+ if (params_rate(params) > priv->max_rate)
+ return -EINVAL;
+
+ return 0;
+}
+
static const struct snd_soc_dapm_widget wm8782_dapm_widgets[] = {
SND_SOC_DAPM_INPUT("AINL"),
SND_SOC_DAPM_INPUT("AINR"),
@@ -33,28 +57,22 @@ static const struct snd_soc_dapm_route wm8782_dapm_routes[] = {
{ "Capture", NULL, "AINR" },
};

+static const struct snd_soc_dai_ops wm8782_dai_ops = {
+ .hw_params = &wm8782_dai_hw_params,
+};
+
static struct snd_soc_dai_driver wm8782_dai = {
.name = "wm8782",
.capture = {
.stream_name = "Capture",
.channels_min = 2,
.channels_max = 2,
- /* For configurations with FSAMPEN=0 */
- .rates = SNDRV_PCM_RATE_8000_48000,
+ .rates = SNDRV_PCM_RATE_8000_192000,
.formats = SNDRV_PCM_FMTBIT_S16_LE |
SNDRV_PCM_FMTBIT_S20_3LE |
SNDRV_PCM_FMTBIT_S24_LE,
},
-};
-
-/* regulator power supply names */
-static const char *supply_names[] = {
- "Vdda", /* analog supply, 2.7V - 3.6V */
- "Vdd", /* digital supply, 2.7V - 5.5V */
-};
-
-struct wm8782_priv {
- struct regulator_bulk_data supplies[ARRAY_SIZE(supply_names)];
+ .ops = &wm8782_dai_ops,
};

static int wm8782_soc_probe(struct snd_soc_component *component)
@@ -121,6 +139,9 @@ static int wm8782_probe(struct platform_device *pdev)
if (ret < 0)
return ret;

+ /* For configurations with FSAMPEN=0 */
+ priv->max_rate = 48000;
+
return devm_snd_soc_register_component(&pdev->dev,
&soc_component_dev_wm8782, &wm8782_dai, 1);
}
--
2.42.0