linux-kernel - [PATCH v2 09/14] staging: iio: ad7746: Add remove()

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Date:   Fri, 13 Apr 2018 13:36:46 -0300
From:   Hernán Gonzalez <hernan@...guardiasur.com.ar>
To:     jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, gregkh@...uxfoundation.org,
        Michael.Hennerich@...log.com, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Hernán Gonzalez <hernan@...guardiasur.com.ar>
Subject: [PATCH v2 09/14] staging: iio: ad7746: Add remove()

This allows the driver to be probed and removed as a module powering it
down on remove().

Signed-off-by: Hernán Gonzalez <hernan@...guardiasur.com.ar>
---
 drivers/staging/iio/cdc/ad7746.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/staging/iio/cdc/ad7746.c b/drivers/staging/iio/cdc/ad7746.c
index c29a221..05506bf9 100644
--- a/drivers/staging/iio/cdc/ad7746.c
+++ b/drivers/staging/iio/cdc/ad7746.c
@@ -775,6 +775,31 @@ static int ad7746_probe(struct i2c_client *client,
 	return 0;
 }
 
+static int ad7746_remove(struct i2c_client *client)
+{
+	struct iio_dev *indio_dev = i2c_get_clientdata(client);
+	struct ad7746_chip_info *chip = iio_priv(indio_dev);
+	unsigned char regval;
+	int ret;
+
+	mutex_lock(&chip->lock);
+
+	regval = chip->config | AD7746_CONF_MODE_PWRDN;
+	ret = i2c_smbus_write_byte_data(chip->client, AD7746_REG_CFG, regval);
+
+	mutex_unlock(&chip->lock);
+
+	if (ret < 0) {
+		dev_warn(&client->dev, "Could NOT Power Down!\n");
+		goto out;
+	}
+
+	iio_device_unregister(indio_dev);
+
+out:
+	return ret;
+}
+
 static const struct i2c_device_id ad7746_id[] = {
 	{ "ad7745", 7745 },
 	{ "ad7746", 7746 },
@@ -799,6 +824,7 @@ static struct i2c_driver ad7746_driver = {
 		.of_match_table = of_match_ptr(ad7746_of_match),
 	},
 	.probe = ad7746_probe,
+	.remove = ad7746_remove,
 	.id_table = ad7746_id,
 };
 module_i2c_driver(ad7746_driver);
-- 
2.7.4