linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Alexandru Ardelean <aardelean@deviqon.com>
To: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: jic23@kernel.org, Jonathan.Cameron@huawei.com,
	alexandru.tachici@analog.com, linux@deviqon.com,
	Alexandru Ardelean <aardelean@deviqon.com>
Subject: [PATCH v2 04/12] iio: adc: ad7192: handle zero Avdd regulator value as error
Date: Tue, 11 May 2021 10:18:23 +0300	[thread overview]
Message-ID: <20210511071831.576145-5-aardelean@deviqon.com> (raw)
In-Reply-To: <20210511071831.576145-1-aardelean@deviqon.com>

This change fixes a corner-case, where the returned voltage is actually
zero. This is also what patch ab0afa65bbc7 ("staging: iio: adc: ad7192:
fail probe on get_voltage") was trying to do.

But as Jonathan pointed out, a zero-value would signal that the probe has
succeeded, putting the driver is a semi-initialized state.

Fixes: ab0afa65bbc7 ("staging: iio: adc: ad7192: fail probe on get_voltage")
Cc: Alexandru Tachici <alexandru.tachici@analog.com>
Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
---
 drivers/iio/adc/ad7192.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/iio/adc/ad7192.c b/drivers/iio/adc/ad7192.c
index d3be67aa0522..79df54e0dc96 100644
--- a/drivers/iio/adc/ad7192.c
+++ b/drivers/iio/adc/ad7192.c
@@ -950,6 +950,11 @@ static int ad7192_probe(struct spi_device *spi)
 	}
 
 	voltage_uv = regulator_get_voltage(st->avdd);
+	if (voltage_uv == 0) {
+		ret = -EINVAL;
+		dev_err(&spi->dev, "Zero value provided for AVdd supply\n");
+		goto error_disable_avdd;
+	}
 
 	if (voltage_uv > 0) {
 		st->int_vref_mv = voltage_uv / 1000;
-- 
2.31.1


  parent reply	other threads:[~2021-05-11  7:18 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-11  7:18 [PATCH v2 00/12] ad_sigma_delta: convert all drivers to device-managed Alexandru Ardelean
2021-05-11  7:18 ` [PATCH v2 01/12] iio: adc: ad7124: Fix missbalanced regulator enable / disable on error Alexandru Ardelean
2021-05-11  7:18 ` [PATCH v2 02/12] iio: adc: ad7124: Fix potential overflow due to non sequential channel numbers Alexandru Ardelean
2021-05-11  7:18 ` [PATCH v2 03/12] iio: adc: ad7192: Avoid disabling a clock that was never enabled Alexandru Ardelean
2021-05-11  7:18 ` Alexandru Ardelean [this message]
2021-05-11 14:13   ` [PATCH v2 04/12] iio: adc: ad7192: handle zero Avdd regulator value as error Jonathan Cameron
2021-05-12  6:28     ` Alexandru Ardelean
2021-05-11  7:18 ` [PATCH v2 05/12] iio: adc: ad_sigma_delta: introduct devm_ad_sd_setup_buffer_and_trigger() Alexandru Ardelean
2021-05-11  7:18 ` [PATCH v2 06/12] iio: adc: ad7793: convert to device-managed functions Alexandru Ardelean
2021-05-11  7:18 ` [PATCH v2 07/12] iio: adc: ad7791: " Alexandru Ardelean
2021-05-11  7:18 ` [PATCH v2 08/12] iio: adc: ad7780: " Alexandru Ardelean
2021-05-11  7:18 ` [PATCH v2 09/12] iio: adc: ad7192: use devm_clk_get_optional() for mclk Alexandru Ardelean
2021-05-11  7:18 ` [PATCH v2 10/12] iio: adc: ad7192: convert to device-managed functions Alexandru Ardelean
2021-05-11  7:18 ` [PATCH v2 11/12] iio: adc: ad7124: Use devm_ managed calls for all of probe() + drop remove() Alexandru Ardelean
2021-05-11  7:18 ` [PATCH v2 12/12] iio: adc: ad_sigma_delta: remove ad_sd_{setup,cleanup}_buffer_and_trigger() Alexandru Ardelean

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=20210511071831.576145-5-aardelean@deviqon.com \
    --to=aardelean@deviqon.com \
    --cc=Jonathan.Cameron@huawei.com \
    --cc=alexandru.tachici@analog.com \
    --cc=jic23@kernel.org \
    --cc=linux-iio@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux@deviqon.com \
    --subject='Re: [PATCH v2 04/12] iio: adc: ad7192: handle zero Avdd regulator value as error' \
    /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

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).