diff options
| author | H. Nikolaus Schaller <hns@goldelico.com> | 2017-02-17 12:51:19 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-03-22 09:17:35 +0100 |
| commit | 3ec4b846a5dda7fe983015e6310c3d551b029329 (patch) | |
| tree | cdf2672c53223c3065eee2629954ac85c6381b05 /drivers/input/touchscreen | |
| parent | 7bd2d0c746f1fac2fb7f2ee972767cbc8be60962 (diff) | |
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>
Diffstat (limited to 'drivers/input/touchscreen')
| -rw-r--r-- | drivers/input/touchscreen/tsc2007.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/tsc2007.c b/drivers/input/touchscreen/tsc2007.c index 5d0cd51c6f41..a4b7b4c3d27b 100644 --- a/drivers/input/touchscreen/tsc2007.c +++ b/drivers/input/touchscreen/tsc2007.c @@ -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, |