[alsa-devel] [PATCH 4/8] Input: twl6040-vibra: Check the selected path for vibra

[Peter Ujfalusi]

The VIBSELL/R bit in the VIBCTLL/R register tells the source of the data,
which is going to be used to drive the attached motor(s).
Do not allow effect execution if any of the channels are set to receive
audio data.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi at ti.com>
---
 drivers/input/misc/twl6040-vibra.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/input/misc/twl6040-vibra.c b/drivers/input/misc/twl6040-vibra.c
index cb74185..fe624f2 100644
--- a/drivers/input/misc/twl6040-vibra.c
+++ b/drivers/input/misc/twl6040-vibra.c
@@ -201,6 +201,13 @@ static int vibra_play(struct input_dev *input, void *data,
 	struct vibra_info *info = input_get_drvdata(input);
 	int ret;
 
+	/* Do not allow effect, while the routing is set to use audio */
+	ret = twl6040_get_vibralr_status(info->twl6040);
+	if (ret & TWL6040_VIBSEL) {
+		dev_info(&input->dev, "Vibra is configured for audio\n");
+		return -EPERM;
+	}
+
 	info->weak_speed = effect->u.rumble.weak_magnitude;
 	info->strong_speed = effect->u.rumble.strong_magnitude;
 	info->direction = effect->direction < EFFECT_DIR_180_DEG ? 1 : -1;
-- 
1.7.6.1