linux-kernel - Re: [PATCH v2 3/5] iio: adc: ad7292: use devm_regulator_get_enable_read

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <a9e4b62f-7021-4939-82a5-8b2089cd7193@baylibre.com>
Date: Fri, 14 Jun 2024 10:16:26 -0500
From: David Lechner <dlechner@...libre.com>
To: Nuno Sá <noname.nuno@...il.com>,
 Jonathan Cameron <jic23@...nel.org>
Cc: Marcelo Schmitt <marcelo.schmitt1@...il.com>, Nuno Sá
 <nuno.sa@...log.com>, Michael Hennerich <Michael.Hennerich@...log.com>,
 Mark Brown <broonie@...nel.org>, Liam Girdwood <lgirdwood@...il.com>,
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/5] iio: adc: ad7292: use
 devm_regulator_get_enable_read_voltage

On 6/14/24 10:11 AM, Nuno Sá wrote:
> On Wed, 2024-06-12 at 16:03 -0500, David Lechner wrote:
>> This makes use of the new devm_regulator_get_enable_read_voltage()
>> function to reduce boilerplate code.
>>
>> Signed-off-by: David Lechner <dlechner@...libre.com>
>> ---
>> v2 changes:
>> * avoid else in return value check
>> * use macro instead of comment to document internal reference voltage
>> ---
>>  drivers/iio/adc/ad7292.c | 36 ++++++------------------------------
>>  1 file changed, 6 insertions(+), 30 deletions(-)
>>
>> diff --git a/drivers/iio/adc/ad7292.c b/drivers/iio/adc/ad7292.c
>> index 6aadd14f459d..87ffe66058a1 100644
>> --- a/drivers/iio/adc/ad7292.c
>> +++ b/drivers/iio/adc/ad7292.c
>> @@ -17,6 +17,8 @@
>>  
>>  #define ADI_VENDOR_ID 0x0018
>>  
>> +#define AD7292_INTERNAL_REF_MV 1250
>> +
>>  /* AD7292 registers definition */
>>  #define AD7292_REG_VENDOR_ID		0x00
>>  #define AD7292_REG_CONF_BANK		0x05
>> @@ -79,7 +81,6 @@ static const struct iio_chan_spec ad7292_channels_diff[] = {
>>  
>>  struct ad7292_state {
>>  	struct spi_device *spi;
>> -	struct regulator *reg;
>>  	unsigned short vref_mv;
>>  
>>  	__be16 d16 __aligned(IIO_DMA_MINALIGN);
>> @@ -250,13 +251,6 @@ static const struct iio_info ad7292_info = {
>>  	.read_raw = ad7292_read_raw,
>>  };
>>  
>> -static void ad7292_regulator_disable(void *data)
>> -{
>> -	struct ad7292_state *st = data;
>> -
>> -	regulator_disable(st->reg);
>> -}
>> -
>>  static int ad7292_probe(struct spi_device *spi)
>>  {
>>  	struct ad7292_state *st;
>> @@ -277,29 +271,11 @@ static int ad7292_probe(struct spi_device *spi)
>>  		return -EINVAL;
>>  	}
>>  
>> -	st->reg = devm_regulator_get_optional(&spi->dev, "vref");
>> -	if (!IS_ERR(st->reg)) {
>> -		ret = regulator_enable(st->reg);
>> -		if (ret) {
>> -			dev_err(&spi->dev,
>> -				"Failed to enable external vref supply\n");
>> -			return ret;
>> -		}
>> -
>> -		ret = devm_add_action_or_reset(&spi->dev,
>> -					       ad7292_regulator_disable, st);
>> -		if (ret)
>> -			return ret;
>> -
>> -		ret = regulator_get_voltage(st->reg);
>> -		if (ret < 0)
>> -			return ret;
>> +	ret = devm_regulator_get_enable_read_voltage(&spi->dev, "vref");
>> +	if (ret < 0 && ret == -ENODEV)
> 
> ret != -ENODEV?

yup, I messed this one up

> 
> - Nuno Sá
>