test: test sandbox sound driver more rigorously

Consider unexpected values for frequency:

* negative frequency
* zero frequency
* frequency exceeding sampling frequency

As in these cases the sum of the samples is zero also check the count of
the samples.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/sound/sandbox.c b/drivers/sound/sandbox.c
index 4a2c87a84c..c6cbd81fdb 100644
--- a/drivers/sound/sandbox.c
+++ b/drivers/sound/sandbox.c
@@ -29,6 +29,7 @@ struct sandbox_i2s_priv {
 struct sandbox_sound_priv {
 	int setup_called;	/* Incremented when setup() method is called */
 	bool active;		/* TX data is being sent */
+	int count;		/* Use to count the provided audio data */
 	int sum;		/* Use to sum the provided audio data */
 	bool allow_beep;	/* true to allow the start_beep() interface */
 	int frequency_hz;	/* Beep frequency if active, else 0 */
@@ -68,6 +69,13 @@ int sandbox_get_sound_active(struct udevice *dev)
 	return priv->active;
 }
 
+int sandbox_get_sound_count(struct udevice *dev)
+{
+	struct sandbox_sound_priv *priv = dev_get_priv(dev);
+
+	return priv->count;
+}
+
 int sandbox_get_sound_sum(struct udevice *dev)
 {
 	struct sandbox_sound_priv *priv = dev_get_priv(dev);
@@ -168,6 +176,7 @@ static int sandbox_sound_play(struct udevice *dev, void *data, uint data_size)
 
 	for (i = 0; i < data_size; i++)
 		priv->sum += ((uint8_t *)data)[i];
+	priv->count += data_size;
 
 	return i2s_tx_data(uc_priv->i2s, data, data_size);
 }