[PATCH 0/3] iio: adc: ti-ads1015: modernize resource management

[PATCH 0/3] iio: adc: ti-ads1015: modernize resource management

[Archit Anant]

This series modernizes the ti-ads1015 by transitioning it
to a fully devm_ architecture.

y moving resource allocation, device registration, and runtime power
management to the devm_ infrastructure, the teardown sequence is now
guaranteed to execute safely in the reverse order of initialization.
This allows for the complete removal of the ads1015_remove() function,
eliminating boilerplate code and reducing the risk of future resource
leaks.

Additionally, a minor housekeeping patch is included to ensure the
header includes remain alphabetically sorted.

Archit Anant (3):
  iio: adc: ti-ads1015: sort headers alphabetically
  iio: adc: ti-ads1015: use local device pointer in probe
  iio: adc: ti-ads1015: convert to fully managed resources

 drivers/iio/adc/ti-ads1015.c | 89 +++++++++++++++++-------------------
 1 file changed, 42 insertions(+), 47 deletions(-)

-- 
2.39.5

[PATCH 1/3] iio: adc: ti-ads1015: sort headers alphabetically

[Archit Anant]

Reorder include headers alphabetically to comply with the preferred
coding style and improve maintainability.

No functional changes.

Signed-off-by: Archit Anant <architanant5@gmail.com>
---
 drivers/iio/adc/ti-ads1015.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/iio/adc/ti-ads1015.c b/drivers/iio/adc/ti-ads1015.c
index 8a272af69f7d..d95efb870bde 100644
--- a/drivers/iio/adc/ti-ads1015.c
+++ b/drivers/iio/adc/ti-ads1015.c
@@ -11,24 +11,24 @@
  *	* 0x4B - ADDR connected to SCL
  */
 
-#include <linux/module.h>
 #include <linux/cleanup.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
 #include <linux/init.h>
 #include <linux/irq.h>
-#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/pm_runtime.h>
 #include <linux/property.h>
 #include <linux/regmap.h>
-#include <linux/pm_runtime.h>
-#include <linux/mutex.h>
-#include <linux/delay.h>
 
+#include <linux/iio/buffer.h>
+#include <linux/iio/events.h>
 #include <linux/iio/iio.h>
-#include <linux/iio/types.h>
 #include <linux/iio/sysfs.h>
-#include <linux/iio/events.h>
-#include <linux/iio/buffer.h>
-#include <linux/iio/triggered_buffer.h>
 #include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/types.h>
 
 #define ADS1015_DRV_NAME "ads1015"
 
-- 
2.39.5

[PATCH 2/3] iio: adc: ti-ads1015: use local device pointer in probe

[Archit Anant]

Introduce a local device pointer 'dev' in ads1015_probe to
avoid accessing &client->dev repeatedly.

Signed-off-by: Archit Anant <architanant5@gmail.com>
---
 drivers/iio/adc/ti-ads1015.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/iio/adc/ti-ads1015.c b/drivers/iio/adc/ti-ads1015.c
index d95efb870bde..0232a4ca2d77 100644
--- a/drivers/iio/adc/ti-ads1015.c
+++ b/drivers/iio/adc/ti-ads1015.c
@@ -937,12 +937,13 @@ static int ads1015_probe(struct i2c_client *client)
 	struct ads1015_data *data;
 	int ret;
 	int i;
+	struct device *dev = &client->dev;
 
 	chip = i2c_get_match_data(client);
 	if (!chip)
-		return dev_err_probe(&client->dev, -EINVAL, "Unknown chip\n");
+		return dev_err_probe(dev, -EINVAL, "Unknown chip\n");
 
-	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
 	if (!indio_dev)
 		return -ENOMEM;
 
@@ -978,15 +979,15 @@ static int ads1015_probe(struct i2c_client *client)
 					    &ads1015_regmap_config :
 					    &tla2024_regmap_config);
 	if (IS_ERR(data->regmap)) {
-		dev_err(&client->dev, "Failed to allocate register map\n");
+		dev_err(dev, "Failed to allocate register map\n");
 		return PTR_ERR(data->regmap);
 	}
 
-	ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL,
+	ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
 					      ads1015_trigger_handler,
 					      &ads1015_buffer_setup_ops);
 	if (ret < 0) {
-		dev_err(&client->dev, "iio triggered buffer setup failed\n");
+		dev_err(dev, "iio triggered buffer setup failed\n");
 		return ret;
 	}
 
@@ -1018,7 +1019,7 @@ static int ads1015_probe(struct i2c_client *client)
 		if (ret)
 			return ret;
 
-		ret = devm_request_threaded_irq(&client->dev, client->irq,
+		ret = devm_request_threaded_irq(dev, client->irq,
 						NULL, ads1015_event_handler,
 						irq_trig | IRQF_ONESHOT,
 						client->name, indio_dev);
@@ -1032,16 +1033,16 @@ static int ads1015_probe(struct i2c_client *client)
 
 	data->conv_invalid = true;
 
-	ret = pm_runtime_set_active(&client->dev);
+	ret = pm_runtime_set_active(dev);
 	if (ret)
 		return ret;
-	pm_runtime_set_autosuspend_delay(&client->dev, ADS1015_SLEEP_DELAY_MS);
-	pm_runtime_use_autosuspend(&client->dev);
-	pm_runtime_enable(&client->dev);
+	pm_runtime_set_autosuspend_delay(dev, ADS1015_SLEEP_DELAY_MS);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_enable(dev);
 
 	ret = iio_device_register(indio_dev);
 	if (ret < 0) {
-		dev_err(&client->dev, "Failed to register IIO device\n");
+		dev_err(dev, "Failed to register IIO device\n");
 		return ret;
 	}
 
-- 
2.39.5

[PATCH 3/3] iio: adc: ti-ads1015: convert to fully managed resources

[Archit Anant]

Refactor the driver to use devm_ allocations and power
management, allowing for the complete removal of the
ads1015_remove()

Key changes:
- Use devm_add_action_or_reset() to ensure the ADC is safely powered
down upon driver removal.
- Move to devm_pm_runtime_set_active_enabled() to manage the runtime
PM lifecycle.
- Update the PM operations to use DEFINE_RUNTIME_DEV_PM_OPS and
pm_ptr() for modern compiler saftey.
- Convert iio_device_register() and mutex_init() to their devm_
variants.
- Remove the thus obsolete ads1015_remove() function.

Signed-off-by: Archit Anant <architanant5@gmail.com>
---
 drivers/iio/adc/ti-ads1015.c | 58 ++++++++++++++++--------------------
 1 file changed, 26 insertions(+), 32 deletions(-)

diff --git a/drivers/iio/adc/ti-ads1015.c b/drivers/iio/adc/ti-ads1015.c
index 0232a4ca2d77..57e5fa593b31 100644
--- a/drivers/iio/adc/ti-ads1015.c
+++ b/drivers/iio/adc/ti-ads1015.c
@@ -930,6 +930,14 @@ static int ads1015_set_conv_mode(struct ads1015_data *data, int mode)
 				  mode << ADS1015_CFG_MOD_SHIFT);
 }
 
+static void ads1015_power_off(void *data)
+{
+	struct ads1015_data *st = data;
+
+	/* power down single shot mode */
+	ads1015_set_conv_mode(st, ADS1015_SINGLESHOT);
+}
+
 static int ads1015_probe(struct i2c_client *client)
 {
 	const struct ads1015_chip_data *chip;
@@ -950,7 +958,9 @@ static int ads1015_probe(struct i2c_client *client)
 	data = iio_priv(indio_dev);
 	i2c_set_clientdata(client, indio_dev);
 
-	mutex_init(&data->lock);
+	ret = devm_mutex_init(dev, &data->lock);
+	if (ret)
+		return ret;
 
 	indio_dev->name = ADS1015_DRV_NAME;
 	indio_dev->modes = INDIO_DIRECT_MODE;
@@ -1033,38 +1043,23 @@ static int ads1015_probe(struct i2c_client *client)
 
 	data->conv_invalid = true;
 
-	ret = pm_runtime_set_active(dev);
+	ret = devm_add_action_or_reset(dev, ads1015_power_off, data);
 	if (ret)
 		return ret;
-	pm_runtime_set_autosuspend_delay(dev, ADS1015_SLEEP_DELAY_MS);
-	pm_runtime_use_autosuspend(dev);
-	pm_runtime_enable(dev);
 
-	ret = iio_device_register(indio_dev);
-	if (ret < 0) {
-		dev_err(dev, "Failed to register IIO device\n");
+	ret = devm_pm_runtime_set_active_enabled(dev);
+	if (ret)
 		return ret;
-	}
 
-	return 0;
-}
-
-static void ads1015_remove(struct i2c_client *client)
-{
-	struct iio_dev *indio_dev = i2c_get_clientdata(client);
-	struct ads1015_data *data = iio_priv(indio_dev);
-	int ret;
-
-	iio_device_unregister(indio_dev);
-
-	pm_runtime_disable(&client->dev);
-	pm_runtime_set_suspended(&client->dev);
+	pm_runtime_set_autosuspend_delay(dev, ADS1015_SLEEP_DELAY_MS);
+	pm_runtime_use_autosuspend(dev);
 
-	/* power down single shot mode */
-	ret = ads1015_set_conv_mode(data, ADS1015_SINGLESHOT);
+	ret = devm_iio_device_register(dev, indio_dev);
 	if (ret)
-		dev_warn(&client->dev, "Failed to power down (%pe)\n",
-			 ERR_PTR(ret));
+		return dev_err_probe(dev, ret,
+				     "Failed to register IIO device\n");
+
+	return 0;
 }
 
 #ifdef CONFIG_PM
@@ -1090,10 +1085,10 @@ static int ads1015_runtime_resume(struct device *dev)
 }
 #endif
 
-static const struct dev_pm_ops ads1015_pm_ops = {
-	SET_RUNTIME_PM_OPS(ads1015_runtime_suspend,
-			   ads1015_runtime_resume, NULL)
-};
+static DEFINE_RUNTIME_DEV_PM_OPS(ads1015_pm_ops,
+				  ads1015_runtime_suspend,
+				  ads1015_runtime_resume,
+				  NULL);
 
 static const struct ads1015_chip_data ads1015_data = {
 	.channels	= ads1015_channels,
@@ -1148,10 +1143,9 @@ static struct i2c_driver ads1015_driver = {
 	.driver = {
 		.name = ADS1015_DRV_NAME,
 		.of_match_table = ads1015_of_match,
-		.pm = &ads1015_pm_ops,
+		.pm = pm_ptr(&ads1015_pm_ops),
 	},
 	.probe		= ads1015_probe,
-	.remove		= ads1015_remove,
 	.id_table	= ads1015_id,
 };
 
-- 
2.39.5

Re: [PATCH 2/3] iio: adc: ti-ads1015: use local device pointer in probe

[Andy Shevchenko]

On Sat, Jul 18, 2026 at 01:20:15PM +0530, Archit Anant wrote:
> Introduce a local device pointer 'dev' in ads1015_probe to
> avoid accessing &client->dev repeatedly.

...

> static int ads1015_probe(struct i2c_client *client)

>  	struct ads1015_data *data;
>  	int ret;
>  	int i;
> +	struct device *dev = &client->dev;

Preserve reversed xmas tree order.

...

>  	chip = i2c_get_match_data(client);
>  	if (!chip)
> -		return dev_err_probe(&client->dev, -EINVAL, "Unknown chip\n");
> +		return dev_err_probe(dev, -EINVAL, "Unknown chip\n");

Side note: At some point we probably want to unify the error code for missing
driver data to be -ENODATA.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH 3/3] iio: adc: ti-ads1015: convert to fully managed resources

[Andy Shevchenko]

On Sat, Jul 18, 2026 at 01:20:16PM +0530, Archit Anant wrote:
> Refactor the driver to use devm_ allocations and power
> management, allowing for the complete removal of the
> ads1015_remove()
> 
> Key changes:
> - Use devm_add_action_or_reset() to ensure the ADC is safely powered
> down upon driver removal.
> - Move to devm_pm_runtime_set_active_enabled() to manage the runtime
> PM lifecycle.
> - Update the PM operations to use DEFINE_RUNTIME_DEV_PM_OPS and
> pm_ptr() for modern compiler saftey.
> - Convert iio_device_register() and mutex_init() to their devm_
> variants.
> - Remove the thus obsolete ads1015_remove() function.

...

> +static void ads1015_power_off(void *data)
> +{
> +	struct ads1015_data *st = data;

Unneeded.

> +	/* power down single shot mode */
> +	ads1015_set_conv_mode(st, ADS1015_SINGLESHOT);
> +}

/* power down single shot mode */
static void ads1015_power_off(void *st)
{
	ads1015_set_conv_mode(st, ADS1015_SINGLESHOT);
}

...

> -static const struct dev_pm_ops ads1015_pm_ops = {
> -	SET_RUNTIME_PM_OPS(ads1015_runtime_suspend,
> -			   ads1015_runtime_resume, NULL)
> -};
> +static DEFINE_RUNTIME_DEV_PM_OPS(ads1015_pm_ops,
> +				  ads1015_runtime_suspend,
> +				  ads1015_runtime_resume,
> +				  NULL);


>  	.driver = {
>  		.name = ADS1015_DRV_NAME,
>  		.of_match_table = ads1015_of_match,
> -		.pm = &ads1015_pm_ops,
> +		.pm = pm_ptr(&ads1015_pm_ops),
>  	},

This should be split to a separate change. Before even patch 1.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH 2/3] iio: adc: ti-ads1015: use local device pointer in probe

[Jonathan Cameron]

On Sat, 18 Jul 2026 13:20:15 +0530
Archit Anant <architanant5@gmail.com> wrote:

> Introduce a local device pointer 'dev' in ads1015_probe to
> avoid accessing &client->dev repeatedly.
> 
> Signed-off-by: Archit Anant <architanant5@gmail.com>
> ---
>  drivers/iio/adc/ti-ads1015.c | 23 ++++++++++++-----------
>  1 file changed, 12 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/iio/adc/ti-ads1015.c b/drivers/iio/adc/ti-ads1015.c
> index d95efb870bde..0232a4ca2d77 100644
> --- a/drivers/iio/adc/ti-ads1015.c
> +++ b/drivers/iio/adc/ti-ads1015.c
> @@ -937,12 +937,13 @@ static int ads1015_probe(struct i2c_client *client)
>  	struct ads1015_data *data;
>  	int ret;
>  	int i;
> +	struct device *dev = &client->dev;
>  
>  	chip = i2c_get_match_data(client);
>  	if (!chip)
> -		return dev_err_probe(&client->dev, -EINVAL, "Unknown chip\n");
> +		return dev_err_probe(dev, -EINVAL, "Unknown chip\n");
>  
> -	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
> +	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
>  	if (!indio_dev)
>  		return -ENOMEM;
>  
> @@ -978,15 +979,15 @@ static int ads1015_probe(struct i2c_client *client)
>  					    &ads1015_regmap_config :
>  					    &tla2024_regmap_config);
>  	if (IS_ERR(data->regmap)) {
> -		dev_err(&client->dev, "Failed to allocate register map\n");
> +		dev_err(dev, "Failed to allocate register map\n");
Whilst touching this anyway please switch the cases like this one
1. In probe() or things only called from probe()
2. Return directly after dev_err() 
over to return dev_err_probe()


>  		return PTR_ERR(data->regmap);
>  	}
>  
> -	ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL,
> +	ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
>  					      ads1015_trigger_handler,
>  					      &ads1015_buffer_setup_ops);
>  	if (ret < 0) {
> -		dev_err(&client->dev, "iio triggered buffer setup failed\n");
> +		dev_err(dev, "iio triggered buffer setup failed\n");
>  		return ret;
>  	}
>  
> @@ -1018,7 +1019,7 @@ static int ads1015_probe(struct i2c_client *client)
>  		if (ret)
>  			return ret;
>  
> -		ret = devm_request_threaded_irq(&client->dev, client->irq,
> +		ret = devm_request_threaded_irq(dev, client->irq,
>  						NULL, ads1015_event_handler,
>  						irq_trig | IRQF_ONESHOT,
>  						client->name, indio_dev);
> @@ -1032,16 +1033,16 @@ static int ads1015_probe(struct i2c_client *client)
>  
>  	data->conv_invalid = true;
>  
> -	ret = pm_runtime_set_active(&client->dev);
> +	ret = pm_runtime_set_active(dev);
>  	if (ret)
>  		return ret;
> -	pm_runtime_set_autosuspend_delay(&client->dev, ADS1015_SLEEP_DELAY_MS);
> -	pm_runtime_use_autosuspend(&client->dev);
> -	pm_runtime_enable(&client->dev);
> +	pm_runtime_set_autosuspend_delay(dev, ADS1015_SLEEP_DELAY_MS);
> +	pm_runtime_use_autosuspend(dev);
> +	pm_runtime_enable(dev);
>  
>  	ret = iio_device_register(indio_dev);
>  	if (ret < 0) {
> -		dev_err(&client->dev, "Failed to register IIO device\n");
> +		dev_err(dev, "Failed to register IIO device\n");
>  		return ret;
>  	}
>  

Re: [PATCH 3/3] iio: adc: ti-ads1015: convert to fully managed resources

[Jonathan Cameron]

On Sat, 18 Jul 2026 13:20:16 +0530
Archit Anant <architanant5@gmail.com> wrote:

> Refactor the driver to use devm_ allocations and power
> management, allowing for the complete removal of the
> ads1015_remove()
> 
> Key changes:
> - Use devm_add_action_or_reset() to ensure the ADC is safely powered
> down upon driver removal.
> - Move to devm_pm_runtime_set_active_enabled() to manage the runtime
> PM lifecycle.
> - Update the PM operations to use DEFINE_RUNTIME_DEV_PM_OPS and
> pm_ptr() for modern compiler saftey.
> - Convert iio_device_register() and mutex_init() to their devm_
> variants.
> - Remove the thus obsolete ads1015_remove() function.

See below. I'm fairly sure this is also fixing a bug.  Ideally you'd
fix that first at the start of the series then refactor it later.

Jonathan

> 
> Signed-off-by: Archit Anant <architanant5@gmail.com>
> ---
>  drivers/iio/adc/ti-ads1015.c | 58 ++++++++++++++++--------------------
>  1 file changed, 26 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/iio/adc/ti-ads1015.c b/drivers/iio/adc/ti-ads1015.c
> index 0232a4ca2d77..57e5fa593b31 100644
> --- a/drivers/iio/adc/ti-ads1015.c
> +++ b/drivers/iio/adc/ti-ads1015.c
> @@ -930,6 +930,14 @@ static int ads1015_set_conv_mode(struct ads1015_data *data, int mode)
>  				  mode << ADS1015_CFG_MOD_SHIFT);
>  }
>  
> +static void ads1015_power_off(void *data)
> +{
> +	struct ads1015_data *st = data;
> +
> +	/* power down single shot mode */
> +	ads1015_set_conv_mode(st, ADS1015_SINGLESHOT);
> +}
> +
>  static int ads1015_probe(struct i2c_client *client)
>  {
>  	const struct ads1015_chip_data *chip;
> @@ -950,7 +958,9 @@ static int ads1015_probe(struct i2c_client *client)
>  	data = iio_priv(indio_dev);
>  	i2c_set_clientdata(client, indio_dev);
>  
> -	mutex_init(&data->lock);
> +	ret = devm_mutex_init(dev, &data->lock);
> +	if (ret)
> +		return ret;
>  
>  	indio_dev->name = ADS1015_DRV_NAME;
>  	indio_dev->modes = INDIO_DIRECT_MODE;
> @@ -1033,38 +1043,23 @@ static int ads1015_probe(struct i2c_client *client)
>  
>  	data->conv_invalid = true;
>  
> -	ret = pm_runtime_set_active(dev);
> +	ret = devm_add_action_or_reset(dev, ads1015_power_off, data);
>  	if (ret)
>  		return ret;
> -	pm_runtime_set_autosuspend_delay(dev, ADS1015_SLEEP_DELAY_MS);
> -	pm_runtime_use_autosuspend(dev);
> -	pm_runtime_enable(dev);
>  
> -	ret = iio_device_register(indio_dev);
> -	if (ret < 0) {
> -		dev_err(dev, "Failed to register IIO device\n");
> +	ret = devm_pm_runtime_set_active_enabled(dev);
> +	if (ret)
>  		return ret;

Worth noting this was a bug as noting turned off the runtime
pm if we got an error in iio_device_register().  That is fixed
by this patch I think.

> -	}
>  
> -	return 0;
> -}
> -
> -static void ads1015_remove(struct i2c_client *client)
> -{
> -	struct iio_dev *indio_dev = i2c_get_clientdata(client);
> -	struct ads1015_data *data = iio_priv(indio_dev);
> -	int ret;
> -
> -	iio_device_unregister(indio_dev);
> -
> -	pm_runtime_disable(&client->dev);
> -	pm_runtime_set_suspended(&client->dev);
> +	pm_runtime_set_autosuspend_delay(dev, ADS1015_SLEEP_DELAY_MS);
> +	pm_runtime_use_autosuspend(dev);
>  
> -	/* power down single shot mode */
> -	ret = ads1015_set_conv_mode(data, ADS1015_SINGLESHOT);
> +	ret = devm_iio_device_register(dev, indio_dev);
>  	if (ret)
> -		dev_warn(&client->dev, "Failed to power down (%pe)\n",
> -			 ERR_PTR(ret));
> +		return dev_err_probe(dev, ret,
> +				     "Failed to register IIO device\n");
> +
> +	return 0;
>  }
>  
>  #ifdef CONFIG_PM
> @@ -1090,10 +1085,10 @@ static int ads1015_runtime_resume(struct device *dev)
>  }
>  #endif
>  
> -static const struct dev_pm_ops ads1015_pm_ops = {
> -	SET_RUNTIME_PM_OPS(ads1015_runtime_suspend,
> -			   ads1015_runtime_resume, NULL)
> -};
> +static DEFINE_RUNTIME_DEV_PM_OPS(ads1015_pm_ops,

Sashiko points this out.  Switching to this and leaving the CONFIG_PM
ifdef above is a bug.
https://sashiko.dev/#/patchset/20260718075016.27750-1-architanant5%40gmail.com

I didn't chase through whether you can also safely remove the other
one further up in the code.

> +				  ads1015_runtime_suspend,
> +				  ads1015_runtime_resume,
> +				  NULL);
>  
>  static const struct ads1015_chip_data ads1015_data = {
>  	.channels	= ads1015_channels,
> @@ -1148,10 +1143,9 @@ static struct i2c_driver ads1015_driver = {
>  	.driver = {
>  		.name = ADS1015_DRV_NAME,
>  		.of_match_table = ads1015_of_match,
> -		.pm = &ads1015_pm_ops,
> +		.pm = pm_ptr(&ads1015_pm_ops),
>  	},
>  	.probe		= ads1015_probe,
> -	.remove		= ads1015_remove,
>  	.id_table	= ads1015_id,
>  };
>