From: Alexandru Ardelean <aardelean@deviqon.com>
To: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: jic23@kernel.org, Alexandru Ardelean <aardelean@deviqon.com>
Subject: [PATCH] iio: potentiometer: max5481: convert probe to device-managed
Date: Thu, 24 Jun 2021 11:06:41 +0300 [thread overview]
Message-ID: <20210624080641.9953-1-aardelean@deviqon.com> (raw)
The change converts the probe function to use the
devm_iio_device_register() function.
Before calling that, we need to register an action to store the wiper back
to non-volatile memory when the device is de-registered.
We don't need to do this if the probe fails, because the only place where
the probe can fail now is devm_iio_device_register() and that shouldn't
create an IIO device (for userspace to poke at) if it fails.
Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
---
drivers/iio/potentiometer/max5481.c | 22 +++++++++-------------
1 file changed, 9 insertions(+), 13 deletions(-)
diff --git a/drivers/iio/potentiometer/max5481.c b/drivers/iio/potentiometer/max5481.c
index 6e22b538091f..098d144a8fdd 100644
--- a/drivers/iio/potentiometer/max5481.c
+++ b/drivers/iio/potentiometer/max5481.c
@@ -125,6 +125,11 @@ static const struct of_device_id max5481_match[] = {
};
MODULE_DEVICE_TABLE(of, max5481_match);
+static void max5481_wiper_save(void *data)
+{
+ max5481_write_cmd(data, MAX5481_COPY_AB_TO_NV, 0);
+}
+
static int max5481_probe(struct spi_device *spi)
{
struct iio_dev *indio_dev;
@@ -136,7 +141,6 @@ static int max5481_probe(struct spi_device *spi)
if (!indio_dev)
return -ENOMEM;
- spi_set_drvdata(spi, indio_dev);
data = iio_priv(indio_dev);
data->spi = spi;
@@ -158,18 +162,11 @@ static int max5481_probe(struct spi_device *spi)
if (ret < 0)
return ret;
- return iio_device_register(indio_dev);
-}
-
-static int max5481_remove(struct spi_device *spi)
-{
- struct iio_dev *indio_dev = spi_get_drvdata(spi);
- struct max5481_data *data = iio_priv(indio_dev);
-
- iio_device_unregister(indio_dev);
+ ret = devm_add_action(&spi->dev, max5481_wiper_save, data);
+ if (ret < 0)
+ return ret;
- /* save wiper reg to NV reg */
- return max5481_write_cmd(data, MAX5481_COPY_AB_TO_NV, 0);
+ return devm_iio_device_register(&spi->dev, indio_dev);
}
static const struct spi_device_id max5481_id_table[] = {
@@ -187,7 +184,6 @@ static struct spi_driver max5481_driver = {
.of_match_table = max5481_match,
},
.probe = max5481_probe,
- .remove = max5481_remove,
.id_table = max5481_id_table,
};
--
2.31.1
next reply other threads:[~2021-06-24 8:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-24 8:06 Alexandru Ardelean [this message]
2021-07-18 14:29 ` [PATCH] iio: potentiometer: max5481: convert probe to device-managed Jonathan Cameron
2021-07-19 11:34 ` Anderson, Maury J Collins
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210624080641.9953-1-aardelean@deviqon.com \
--to=aardelean@deviqon.com \
--cc=jic23@kernel.org \
--cc=linux-iio@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).