On Wed, Dec 28, 2016 at 03:53:17PM +0100, H. Nikolaus Schaller wrote:
> 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>
Applied, thank you.
> ---
> drivers/input/touchscreen/tsc2007.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c
> index c1d9593..76b462b 100644
> --- a/drivers/input/touchscreen/tsc2007.c
> +++ b/drivers/input/touchscreen/tsc2007.c
> @@ -529,6 +529,14 @@ 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,
> --
> 2.7.3
>
--
Dmitry
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