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

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[ 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>
This commit is contained in:
H. Nikolaus Schaller 2017-02-17 12:51:19 -08:00 committed by Greg Kroah-Hartman
parent 633a5a5235
commit 3389b38613
1 changed files with 8 additions and 0 deletions
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8
drivers/input/touchscreen/tsc2007.c
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@ -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,