linux-kernel - [PATCH v3] io: accel: kxcjk1013: restore the range after resume.

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Date:   Wed,  6 Mar 2019 10:32:20 +0800
From:   "Chen, Hu" <hu1.chen@...el.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     hu1.chen@...el.com, bo.he@...el.com, he@...r.kernel.org,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Hans de Goede <hdegoede@...hat.com>,
        Stephan Gerhold <stephan@...hold.net>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3] io: accel: kxcjk1013: restore the range after resume.

From: "he, bo" <bo.he@...el.com>

On some laptops, kxcjk1013 is powered off when system enters S3. We need
restore the range regiter during resume. Otherwise, the sensor doesn't
work properly after S3.

Signed-off-by: he, bo <bo.he@...el.com>
Signed-off-by: Chen, Hu <hu1.chen@...el.com>
---
 v3: Avoid unnecessary mutex_unlock (Hans).
 v2: Handle return value independently (Jonathan).

 drivers/iio/accel/kxcjk-1013.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iio/accel/kxcjk-1013.c b/drivers/iio/accel/kxcjk-1013.c
index 7096e577b23f..50f3ff386bea 100644
--- a/drivers/iio/accel/kxcjk-1013.c
+++ b/drivers/iio/accel/kxcjk-1013.c
@@ -1437,6 +1437,8 @@ static int kxcjk1013_resume(struct device *dev)
 
 	mutex_lock(&data->mutex);
 	ret = kxcjk1013_set_mode(data, OPERATION);
+	if (ret == 0)
+		ret = kxcjk1013_set_range(data, data->range);
 	mutex_unlock(&data->mutex);
 
 	return ret;
-- 
2.20.1