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path: root/sound/soc/stm/stm32_adfsdm.c
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Diffstat (limited to 'sound/soc/stm/stm32_adfsdm.c')
-rw-r--r--sound/soc/stm/stm32_adfsdm.c38
1 files changed, 34 insertions, 4 deletions
diff --git a/sound/soc/stm/stm32_adfsdm.c b/sound/soc/stm/stm32_adfsdm.c
index 1f20ff1ccb57..cc517e007039 100644
--- a/sound/soc/stm/stm32_adfsdm.c
+++ b/sound/soc/stm/stm32_adfsdm.c
@@ -9,6 +9,7 @@
#include <linux/clk.h>
#include <linux/module.h>
+#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@@ -37,6 +38,8 @@ struct stm32_adfsdm_priv {
/* PCM buffer */
unsigned char *pcm_buff;
unsigned int pos;
+
+ struct mutex lock; /* protect against race condition on iio state */
};
static const struct snd_pcm_hardware stm32_adfsdm_pcm_hw = {
@@ -62,10 +65,12 @@ static void stm32_adfsdm_shutdown(struct snd_pcm_substream *substream,
{
struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(dai);
+ mutex_lock(&priv->lock);
if (priv->iio_active) {
iio_channel_stop_all_cb(priv->iio_cb);
priv->iio_active = false;
}
+ mutex_unlock(&priv->lock);
}
static int stm32_adfsdm_dai_prepare(struct snd_pcm_substream *substream,
@@ -74,13 +79,19 @@ static int stm32_adfsdm_dai_prepare(struct snd_pcm_substream *substream,
struct stm32_adfsdm_priv *priv = snd_soc_dai_get_drvdata(dai);
int ret;
+ mutex_lock(&priv->lock);
+ if (priv->iio_active) {
+ iio_channel_stop_all_cb(priv->iio_cb);
+ priv->iio_active = false;
+ }
+
ret = iio_write_channel_attribute(priv->iio_ch,
substream->runtime->rate, 0,
IIO_CHAN_INFO_SAMP_FREQ);
if (ret < 0) {
dev_err(dai->dev, "%s: Failed to set %d sampling rate\n",
__func__, substream->runtime->rate);
- return ret;
+ goto out;
}
if (!priv->iio_active) {
@@ -92,6 +103,9 @@ static int stm32_adfsdm_dai_prepare(struct snd_pcm_substream *substream,
__func__, ret);
}
+out:
+ mutex_unlock(&priv->lock);
+
return ret;
}
@@ -291,6 +305,7 @@ MODULE_DEVICE_TABLE(of, stm32_adfsdm_of_match);
static int stm32_adfsdm_probe(struct platform_device *pdev)
{
struct stm32_adfsdm_priv *priv;
+ struct snd_soc_component *component;
int ret;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
@@ -299,6 +314,7 @@ static int stm32_adfsdm_probe(struct platform_device *pdev)
priv->dev = &pdev->dev;
priv->dai_drv = stm32_adfsdm_dai;
+ mutex_init(&priv->lock);
dev_set_drvdata(&pdev->dev, priv);
@@ -317,9 +333,15 @@ static int stm32_adfsdm_probe(struct platform_device *pdev)
if (IS_ERR(priv->iio_cb))
return PTR_ERR(priv->iio_cb);
- ret = devm_snd_soc_register_component(&pdev->dev,
- &stm32_adfsdm_soc_platform,
- NULL, 0);
+ component = devm_kzalloc(&pdev->dev, sizeof(*component), GFP_KERNEL);
+ if (!component)
+ return -ENOMEM;
+#ifdef CONFIG_DEBUG_FS
+ component->debugfs_prefix = "pcm";
+#endif
+
+ ret = snd_soc_add_component(&pdev->dev, component,
+ &stm32_adfsdm_soc_platform, NULL, 0);
if (ret < 0)
dev_err(&pdev->dev, "%s: Failed to register PCM platform\n",
__func__);
@@ -327,12 +349,20 @@ static int stm32_adfsdm_probe(struct platform_device *pdev)
return ret;
}
+static int stm32_adfsdm_remove(struct platform_device *pdev)
+{
+ snd_soc_unregister_component(&pdev->dev);
+
+ return 0;
+}
+
static struct platform_driver stm32_adfsdm_driver = {
.driver = {
.name = STM32_ADFSDM_DRV_NAME,
.of_match_table = stm32_adfsdm_of_match,
},
.probe = stm32_adfsdm_probe,
+ .remove = stm32_adfsdm_remove,
};
module_platform_driver(stm32_adfsdm_driver);