linux-kernel - [PATCH v2] io: accel: kxcjk1013: restore the range after resume.

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Message-Id: <20190304070556.24681-1-hu1.chen@intel.com>
Date:   Mon,  4 Mar 2019 15:05:55 +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 v2] 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>
---
Changes in v2:
- Handle return value independently in resume callback.

 drivers/iio/accel/kxcjk-1013.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/iio/accel/kxcjk-1013.c b/drivers/iio/accel/kxcjk-1013.c
index 7096e577b23f..17837e26bcf2 100644
--- a/drivers/iio/accel/kxcjk-1013.c
+++ b/drivers/iio/accel/kxcjk-1013.c
@@ -1437,6 +1437,11 @@ static int kxcjk1013_resume(struct device *dev)
 
 	mutex_lock(&data->mutex);
 	ret = kxcjk1013_set_mode(data, OPERATION);
+	if (ret < 0) {
+		mutex_unlock(&data->mutex);
+		return ret;
+	}
+	ret = kxcjk1013_set_range(data, data->range);
 	mutex_unlock(&data->mutex);
 
 	return ret;
-- 
2.20.1