iio:chemical:ccs811: Improve error reporting for problems during .remove()

Returning an error value in an i2c remove callback results in a generic
error message being emitted by the i2c core, but otherwise it doesn't
make a difference. The device goes away anyhow and the devm cleanups are
called.

So instead of triggering the generic i2c error message, emit a more
helpful message if a problem occurs and return 0 to suppress the generic
message.

This patch is a preparation for making i2c remove callbacks return void.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20220515155929.338656-5-u.kleine-koenig@pengutronix.de
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/chemical/ccs811.c b/drivers/iio/chemical/ccs811.c
index 847194f..c38093e 100644 (file)
--- a/drivers/iio/chemical/ccs811.c
+++ b/drivers/iio/chemical/ccs811.c
@@ -536,14 +536,20 @@ static int ccs811_remove(struct i2c_client *client)
 {
        struct iio_dev *indio_dev = i2c_get_clientdata(client);
        struct ccs811_data *data = iio_priv(indio_dev);
+       int ret;
 
        iio_device_unregister(indio_dev);
        iio_triggered_buffer_cleanup(indio_dev);
        if (data->drdy_trig)
                iio_trigger_unregister(data->drdy_trig);
 
-       return i2c_smbus_write_byte_data(client, CCS811_MEAS_MODE,
-                                        CCS811_MODE_IDLE);
+       ret = i2c_smbus_write_byte_data(client, CCS811_MEAS_MODE,
+                                       CCS811_MODE_IDLE);
+       if (ret)
+               dev_warn(&client->dev, "Failed to power down device (%pe)\n",
+                        ERR_PTR(ret));
+
+       return 0;
 }
 
 static const struct i2c_device_id ccs811_id[] = {