Commit 3389b386 authored Feb 17, 2017 by H. Nikolaus Schaller Committed by Greg Kroah-Hartman Mar 22, 2018

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




[ Upstream commit 934df23171e7c5b71d937104d4957891c39748ff ]

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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 633a5a52

drivers/input/touchscreen/tsc2007.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -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,