This is a note to let you know that I've just added the patch titled
Input: tsc2007 - check for presence and power down tsc2007 during probe
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
input-tsc2007-check-for-presence-and-power-down-tsc2007-during-probe.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Mon Mar 19 09:58:11 CET 2018
From: "H. Nikolaus Schaller" <hns@xxxxxxxxxxxxx>
Date: Fri, 17 Feb 2017 12:51:19 -0800
Subject: Input: tsc2007 - check for presence and power down tsc2007 during probe
From: "H. Nikolaus Schaller" <hns@xxxxxxxxxxxxx>
[ 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@xxxxxxxxxxxxx>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/input/touchscreen/tsc2007.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/drivers/input/touchscreen/tsc2007.c
+++ b/drivers/input/touchscreen/tsc2007.c
@@ -455,6 +455,14 @@ static int tsc2007_probe(struct i2c_clie
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,
Patches currently in stable-queue which might be from hns@xxxxxxxxxxxxx are
queue-4.4/input-tsc2007-check-for-presence-and-power-down-tsc2007-during-probe.patch