[Letux-kernel] [PATCH v9 2/8] drivers:input:tsc2007: check for presence and power down tsc2007 during probe

Dmitry Torokhov dmitry.torokhov at gmail.com
Fri Feb 17 21:52:44 CET 2017


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 at goldelico.com>

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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