Re: [PATCH v4] staging: iio: adt7316: use kstrtobool() for sysfs boolean parsing

From: Jonathan Cameron

Date: Sun Oct 18 2026 - 23:09:52 EST

On Sun, 18 Oct 2026 17:31:08 +0300
Abdelnasser Hussein <abdelnasserhussein11@xxxxxxxxx> wrote:

> Replace manual character checks (e.g., buf[0] == '1') with the standard
> kstrtobool() API in sysfs store functions.
>
> Signed-off-by: Abdelnasser Hussein <abdelnasserhussein11@xxxxxxxxx>
Ah. No need to resend just to drop a tag. I did that on v3.

Anyhow, all is well that ends well!

Thanks,

Jonathan

> ---
> Changes in v4:
> - Removed Joshua's Reviewed-by tag.
>
> Changes in v3:
> - Change _adt7316_store_enabled() parameter type from int to bool to match callers (Andy Shevchenko).
> - Update adt7316_disable() and adt7316_enable() to pass false/true instead of 0/1 (Andy Shevchenko).
>
> Changes in v2:
> - Include <linux/kstrtox.h>.
> - Rename the boolean variable from 'req' to 'val' for clarity.
> - Add Reviewed-by tag from Joshua Crofts.
>
> drivers/staging/iio/addac/adt7316.c | 101 ++++++++++++++++++++++------
> 1 file changed, 81 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/staging/iio/addac/adt7316.c b/drivers/staging/iio/addac/adt7316.c
> index 20f6052cc7fb..ec1c33ad5ace 100644
> --- a/drivers/staging/iio/addac/adt7316.c
> +++ b/drivers/staging/iio/addac/adt7316.c
> @@ -17,6 +17,7 @@
> #include <linux/i2c.h>
> #include <linux/rtc.h>
> #include <linux/module.h>
> +#include <linux/kstrtox.h>
>
> #include <linux/iio/iio.h>
> #include <linux/iio/events.h>
> @@ -220,7 +221,7 @@ static ssize_t adt7316_show_enabled(struct device *dev,
> }
>
> static ssize_t _adt7316_store_enabled(struct adt7316_chip_info *chip,
> - int enable)
> + bool enable)
> {
> u8 config1;
> int ret;
> @@ -246,12 +247,12 @@ static ssize_t adt7316_store_enabled(struct device *dev,
> {
> struct iio_dev *dev_info = dev_to_iio_dev(dev);
> struct adt7316_chip_info *chip = iio_priv(dev_info);
> - int enable;
> + bool enable;
> + int ret;
>
> - if (buf[0] == '1')
> - enable = 1;
> - else
> - enable = 0;
> + ret = kstrtobool(buf, &enable);
> + if (ret)
> + return ret;
>
> if (_adt7316_store_enabled(chip, enable) < 0)
> return -EIO;
> @@ -285,13 +286,18 @@ static ssize_t adt7316_store_select_ex_temp(struct device *dev,
> struct iio_dev *dev_info = dev_to_iio_dev(dev);
> struct adt7316_chip_info *chip = iio_priv(dev_info);
> u8 config1;
> + bool val;
> int ret;
>
> if ((chip->id & ID_FAMILY_MASK) != ID_ADT75XX)
> return -EPERM;
>
> + ret = kstrtobool(buf, &val);
> + if (ret)
> + return ret;
> +
> config1 = chip->config1 & (~ADT7516_SEL_EX_TEMP);
> - if (buf[0] == '1')
> + if (val)
> config1 |= ADT7516_SEL_EX_TEMP;
>
> ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG1, config1);
> @@ -482,10 +488,15 @@ static ssize_t adt7316_store_disable_averaging(struct device *dev,
> struct iio_dev *dev_info = dev_to_iio_dev(dev);
> struct adt7316_chip_info *chip = iio_priv(dev_info);
> u8 config2;
> + bool val;
> int ret;
>
> + ret = kstrtobool(buf, &val);
> + if (ret)
> + return ret;
> +
> config2 = chip->config2 & (~ADT7316_DISABLE_AVERAGING);
> - if (buf[0] == '1')
> + if (val)
> config2 |= ADT7316_DISABLE_AVERAGING;
>
> ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG2, config2);
> @@ -521,10 +532,15 @@ static ssize_t adt7316_store_enable_smbus_timeout(struct device *dev,
> struct iio_dev *dev_info = dev_to_iio_dev(dev);
> struct adt7316_chip_info *chip = iio_priv(dev_info);
> u8 config2;
> + bool val;
> int ret;
>
> + ret = kstrtobool(buf, &val);
> + if (ret)
> + return ret;
> +
> config2 = chip->config2 & (~ADT7316_EN_SMBUS_TIMEOUT);
> - if (buf[0] == '1')
> + if (val)
> config2 |= ADT7316_EN_SMBUS_TIMEOUT;
>
> ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG2, config2);
> @@ -559,10 +575,15 @@ static ssize_t adt7316_store_powerdown(struct device *dev,
> struct iio_dev *dev_info = dev_to_iio_dev(dev);
> struct adt7316_chip_info *chip = iio_priv(dev_info);
> u8 config1;
> + bool val;
> int ret;
>
> + ret = kstrtobool(buf, &val);
> + if (ret)
> + return ret;
> +
> config1 = chip->config1 & (~ADT7316_PD);
> - if (buf[0] == '1')
> + if (val)
> config1 |= ADT7316_PD;
>
> ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG1, config1);
> @@ -597,10 +618,15 @@ static ssize_t adt7316_store_fast_ad_clock(struct device *dev,
> struct iio_dev *dev_info = dev_to_iio_dev(dev);
> struct adt7316_chip_info *chip = iio_priv(dev_info);
> u8 config3;
> + bool val;
> int ret;
>
> + ret = kstrtobool(buf, &val);
> + if (ret)
> + return ret;
> +
> config3 = chip->config3 & (~ADT7316_ADCLK_22_5);
> - if (buf[0] == '1')
> + if (val)
> config3 |= ADT7316_ADCLK_22_5;
>
> ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG3, config3);
> @@ -640,13 +666,18 @@ static ssize_t adt7316_store_da_high_resolution(struct device *dev,
> struct iio_dev *dev_info = dev_to_iio_dev(dev);
> struct adt7316_chip_info *chip = iio_priv(dev_info);
> u8 config3;
> + bool val;
> int ret;
>
> if (chip->id == ID_ADT7318 || chip->id == ID_ADT7519)
> return -EPERM;
>
> + ret = kstrtobool(buf, &val);
> + if (ret)
> + return ret;
> +
> config3 = chip->config3 & (~ADT7316_DA_HIGH_RESOLUTION);
> - if (buf[0] == '1')
> + if (val)
> config3 |= ADT7316_DA_HIGH_RESOLUTION;
>
> ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG3, config3);
> @@ -685,12 +716,17 @@ static ssize_t adt7316_store_AIN_internal_Vref(struct device *dev,
> struct iio_dev *dev_info = dev_to_iio_dev(dev);
> struct adt7316_chip_info *chip = iio_priv(dev_info);
> u8 config3;
> + bool val;
> int ret;
>
> if ((chip->id & ID_FAMILY_MASK) != ID_ADT75XX)
> return -EPERM;
>
> - if (buf[0] != '1')
> + ret = kstrtobool(buf, &val);
> + if (ret)
> + return ret;
> +
> + if (!val)
> config3 = chip->config3 & (~ADT7516_AIN_IN_VREF);
> else
> config3 = chip->config3 | ADT7516_AIN_IN_VREF;
> @@ -728,10 +764,15 @@ static ssize_t adt7316_store_enable_prop_DACA(struct device *dev,
> struct iio_dev *dev_info = dev_to_iio_dev(dev);
> struct adt7316_chip_info *chip = iio_priv(dev_info);
> u8 config3;
> + bool val;
> int ret;
>
> + ret = kstrtobool(buf, &val);
> + if (ret)
> + return ret;
> +
> config3 = chip->config3 & (~ADT7316_EN_IN_TEMP_PROP_DACA);
> - if (buf[0] == '1')
> + if (val)
> config3 |= ADT7316_EN_IN_TEMP_PROP_DACA;
>
> ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG3, config3);
> @@ -767,10 +808,15 @@ static ssize_t adt7316_store_enable_prop_DACB(struct device *dev,
> struct iio_dev *dev_info = dev_to_iio_dev(dev);
> struct adt7316_chip_info *chip = iio_priv(dev_info);
> u8 config3;
> + bool val;
> int ret;
>
> + ret = kstrtobool(buf, &val);
> + if (ret)
> + return ret;
> +
> config3 = chip->config3 & (~ADT7316_EN_EX_TEMP_PROP_DACB);
> - if (buf[0] == '1')
> + if (val)
> config3 |= ADT7316_EN_EX_TEMP_PROP_DACB;
>
> ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG3, config3);
> @@ -967,10 +1013,15 @@ static ssize_t adt7316_store_DA_AB_Vref_bypass(struct device *dev,
> struct iio_dev *dev_info = dev_to_iio_dev(dev);
> struct adt7316_chip_info *chip = iio_priv(dev_info);
> u8 dac_config;
> + bool val;
> int ret;
>
> + ret = kstrtobool(buf, &val);
> + if (ret)
> + return ret;
> +
> dac_config = chip->dac_config & (~ADT7316_VREF_BYPASS_DAC_AB);
> - if (buf[0] == '1')
> + if (val)
> dac_config |= ADT7316_VREF_BYPASS_DAC_AB;
>
> ret = chip->bus.write(chip->bus.client, ADT7316_DAC_CONFIG, dac_config);
> @@ -1006,10 +1057,15 @@ static ssize_t adt7316_store_DA_CD_Vref_bypass(struct device *dev,
> struct iio_dev *dev_info = dev_to_iio_dev(dev);
> struct adt7316_chip_info *chip = iio_priv(dev_info);
> u8 dac_config;
> + bool val;
> int ret;
>
> + ret = kstrtobool(buf, &val);
> + if (ret)
> + return ret;
> +
> dac_config = chip->dac_config & (~ADT7316_VREF_BYPASS_DAC_CD);
> - if (buf[0] == '1')
> + if (val)
> dac_config |= ADT7316_VREF_BYPASS_DAC_CD;
>
> ret = chip->bus.write(chip->bus.client, ADT7316_DAC_CONFIG, dac_config);
> @@ -1969,10 +2025,15 @@ static ssize_t adt7316_set_int_enabled(struct device *dev,
> struct iio_dev *dev_info = dev_to_iio_dev(dev);
> struct adt7316_chip_info *chip = iio_priv(dev_info);
> u8 config1;
> + bool val;
> int ret;
>
> + ret = kstrtobool(buf, &val);
> + if (ret)
> + return ret;
> +
> config1 = chip->config1 & (~ADT7316_INT_EN);
> - if (buf[0] == '1')
> + if (val)
> config1 |= ADT7316_INT_EN;
>
> ret = chip->bus.write(chip->bus.client, ADT7316_CONFIG1, config1);
> @@ -2084,7 +2145,7 @@ static int adt7316_disable(struct device *dev)
> struct iio_dev *dev_info = dev_get_drvdata(dev);
> struct adt7316_chip_info *chip = iio_priv(dev_info);
>
> - return _adt7316_store_enabled(chip, 0);
> + return _adt7316_store_enabled(chip, false);
> }
>
> static int adt7316_enable(struct device *dev)
> @@ -2092,7 +2153,7 @@ static int adt7316_enable(struct device *dev)
> struct iio_dev *dev_info = dev_get_drvdata(dev);
> struct adt7316_chip_info *chip = iio_priv(dev_info);
>
> - return _adt7316_store_enabled(chip, 1);
> + return _adt7316_store_enabled(chip, true);
> }
>
> EXPORT_GPL_SIMPLE_DEV_PM_OPS(adt7316_pm_ops, adt7316_disable, adt7316_enable);