Input: tsc2007 - check for presence and power down tsc2007 during probe

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@goldelico.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
H. Nikolaus Schaller 2017-02-17 12:51:19 -08:00 committed by Dmitry Torokhov
parent 69973b8308
commit 934df23171

View File

@ -455,6 +455,14 @@ 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);
return err; /* usually, chip does not respond */
}
err = input_register_device(input_dev);
if (err) {
dev_err(&client->dev,