1. check if chip is really present and don't succeed if it isn't.
2. if it succeeds, power down the chip until accessed
Signed-off-by: H. Nikolaus Schaller <hns@xxxxxxxxxxxxx>
---
drivers/input/touchscreen/tsc2007.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c
index e9d5086..c314331 100644
--- a/drivers/input/touchscreen/tsc2007.c
+++ b/drivers/input/touchscreen/tsc2007.c
@@ -538,6 +538,15 @@ static int tsc2007_probe(struct i2c_client *client,
tsc2007_stop(ts);
+ /* power down the chip (TSC2007_SETUP does not ACK on I2C) */
+ err = tsc2007_xfer(ts, PWRDOWN);
+ if (err < 0) {
+ dev_err(&client->dev,
+ "Failed to setup chip: %d\n", err);
+ iio_device_unregister(indio_dev);
+ return err; /* usually, chip does not respond */
+ }
+
err = input_register_device(input_dev);
if (err) {
dev_err(&client->dev,
--
2.7.3
--
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