Re: [PATCH 4/4] iio: pressure: bmp280: use devm action and remove labels from probe

[Jonathan Cameron]

On Wed,  2 Oct 2019 10:57:59 +0200
Bartosz Golaszewski <brgl@xxxxxxxx> wrote:

> From: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
> 
> We can drop some duplicate code if we use devm_action for disabling
> regulators and pm. This allows us to completely remove all remove()
> callbacks from both i2c and spi code.
> 
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx>
Ah. I should read all the patches but that would be far too much like hard
work.  Roll this one and patch 2 together and we should have satisfied the
issues I had with that.

Thanks,

Jonathan

> ---
>  drivers/iio/pressure/bmp280-core.c | 61 +++++++++++++++---------------
>  drivers/iio/pressure/bmp280-i2c.c  |  6 ---
>  drivers/iio/pressure/bmp280-spi.c  |  6 ---
>  drivers/iio/pressure/bmp280.h      |  1 -
>  4 files changed, 30 insertions(+), 44 deletions(-)
> 
> diff --git a/drivers/iio/pressure/bmp280-core.c b/drivers/iio/pressure/bmp280-core.c
> index fdbd3bc27921..79254dd26dfd 100644
> --- a/drivers/iio/pressure/bmp280-core.c
> +++ b/drivers/iio/pressure/bmp280-core.c
> @@ -984,6 +984,22 @@ static int bmp085_fetch_eoc_irq(struct device *dev,
>  	return 0;
>  }
>  
> +static void bmp280_pm_disable(void *data)
> +{
> +	struct device *dev = data;
> +
> +	pm_runtime_get_sync(dev);
> +	pm_runtime_put_noidle(dev);
> +	pm_runtime_disable(dev);
> +}
> +
> +static void bmp280_regulators_disable(void *data)
> +{
> +	struct regulator_bulk_data *supplies = data;
> +
> +	regulator_bulk_disable(BMP280_NUM_SUPPLIES, supplies);
> +}
> +
>  int bmp280_common_probe(struct device *dev,
>  			struct regmap *regmap,
>  			unsigned int chip,
> @@ -1055,6 +1071,11 @@ int bmp280_common_probe(struct device *dev,
>  		return ret;
>  	}
>  
> +	ret = devm_add_action_or_reset(dev, bmp280_regulators_disable,
> +				       data->supplies);
> +	if (ret)
> +		return ret;
> +
>  	/* Wait to make sure we started up properly */
>  	usleep_range(data->start_up_time, data->start_up_time + 100);
>  
> @@ -1069,17 +1090,16 @@ int bmp280_common_probe(struct device *dev,
>  	data->regmap = regmap;
>  	ret = regmap_read(regmap, BMP280_REG_ID, &chip_id);
>  	if (ret < 0)
> -		goto out_disable_regulators;
> +		return ret;
>  	if (chip_id != chip) {
>  		dev_err(dev, "bad chip id: expected %x got %x\n",
>  			chip, chip_id);
> -		ret = -EINVAL;
> -		goto out_disable_regulators;
> +		return -EINVAL;
>  	}
>  
>  	ret = data->chip_info->chip_config(data);
>  	if (ret < 0)
> -		goto out_disable_regulators;
> +		return ret;
>  
>  	dev_set_drvdata(dev, indio_dev);
>  
> @@ -1093,14 +1113,14 @@ int bmp280_common_probe(struct device *dev,
>  		if (ret < 0) {
>  			dev_err(data->dev,
>  				"failed to read calibration coefficients\n");
> -			goto out_disable_regulators;
> +			return ret;
>  		}
>  	} else if (chip_id == BMP280_CHIP_ID || chip_id == BME280_CHIP_ID) {
>  		ret = bmp280_read_calib(data, &data->calib.bmp280, chip_id);
>  		if (ret < 0) {
>  			dev_err(data->dev,
>  				"failed to read calibration coefficients\n");
> -			goto out_disable_regulators;
> +			return ret;
>  		}
>  	}
>  
> @@ -1112,7 +1132,7 @@ int bmp280_common_probe(struct device *dev,
>  	if (irq > 0 || (chip_id  == BMP180_CHIP_ID)) {
>  		ret = bmp085_fetch_eoc_irq(dev, name, irq, data);
>  		if (ret)
> -			goto out_disable_regulators;
> +			return ret;
>  	}
>  
>  	/* Enable runtime PM */
> @@ -1127,35 +1147,14 @@ int bmp280_common_probe(struct device *dev,
>  	pm_runtime_use_autosuspend(dev);
>  	pm_runtime_put(dev);
>  
> -	ret = devm_iio_device_register(dev, indio_dev);
> +	ret = devm_add_action_or_reset(dev, bmp280_pm_disable, dev);
>  	if (ret)
> -		goto out_runtime_pm_disable;
> -
> -	return 0;
> +		return ret;
>  
> -out_runtime_pm_disable:
> -	pm_runtime_get_sync(data->dev);
> -	pm_runtime_put_noidle(data->dev);
> -	pm_runtime_disable(data->dev);
> -out_disable_regulators:
> -	regulator_bulk_disable(BMP280_NUM_SUPPLIES, data->supplies);
> -	return ret;
> +	return devm_iio_device_register(dev, indio_dev);
>  }
>  EXPORT_SYMBOL(bmp280_common_probe);
>  
> -int bmp280_common_remove(struct device *dev)
> -{
> -	struct iio_dev *indio_dev = dev_get_drvdata(dev);
> -	struct bmp280_data *data = iio_priv(indio_dev);
> -
> -	pm_runtime_get_sync(data->dev);
> -	pm_runtime_put_noidle(data->dev);
> -	pm_runtime_disable(data->dev);
> -	regulator_bulk_disable(BMP280_NUM_SUPPLIES, data->supplies);
> -	return 0;
> -}
> -EXPORT_SYMBOL(bmp280_common_remove);
> -
>  #ifdef CONFIG_PM
>  static int bmp280_runtime_suspend(struct device *dev)
>  {
> diff --git a/drivers/iio/pressure/bmp280-i2c.c b/drivers/iio/pressure/bmp280-i2c.c
> index acd9a3784fb4..3109c8e2cc11 100644
> --- a/drivers/iio/pressure/bmp280-i2c.c
> +++ b/drivers/iio/pressure/bmp280-i2c.c
> @@ -38,11 +38,6 @@ static int bmp280_i2c_probe(struct i2c_client *client,
>  				   client->irq);
>  }
>  
> -static int bmp280_i2c_remove(struct i2c_client *client)
> -{
> -	return bmp280_common_remove(&client->dev);
> -}
> -
>  static const struct acpi_device_id bmp280_acpi_i2c_match[] = {
>  	{"BMP0280", BMP280_CHIP_ID },
>  	{"BMP0180", BMP180_CHIP_ID },
> @@ -82,7 +77,6 @@ static struct i2c_driver bmp280_i2c_driver = {
>  		.pm = &bmp280_dev_pm_ops,
>  	},
>  	.probe		= bmp280_i2c_probe,
> -	.remove		= bmp280_i2c_remove,
>  	.id_table	= bmp280_i2c_id,
>  };
>  module_i2c_driver(bmp280_i2c_driver);
> diff --git a/drivers/iio/pressure/bmp280-spi.c b/drivers/iio/pressure/bmp280-spi.c
> index 9d57b7a3b134..625b86878ad8 100644
> --- a/drivers/iio/pressure/bmp280-spi.c
> +++ b/drivers/iio/pressure/bmp280-spi.c
> @@ -86,11 +86,6 @@ static int bmp280_spi_probe(struct spi_device *spi)
>  				   spi->irq);
>  }
>  
> -static int bmp280_spi_remove(struct spi_device *spi)
> -{
> -	return bmp280_common_remove(&spi->dev);
> -}
> -
>  static const struct of_device_id bmp280_of_spi_match[] = {
>  	{ .compatible = "bosch,bmp085", },
>  	{ .compatible = "bosch,bmp180", },
> @@ -118,7 +113,6 @@ static struct spi_driver bmp280_spi_driver = {
>  	},
>  	.id_table = bmp280_spi_id,
>  	.probe = bmp280_spi_probe,
> -	.remove = bmp280_spi_remove,
>  };
>  module_spi_driver(bmp280_spi_driver);
>  
> diff --git a/drivers/iio/pressure/bmp280.h b/drivers/iio/pressure/bmp280.h
> index eda50ef65706..57ba0e85db91 100644
> --- a/drivers/iio/pressure/bmp280.h
> +++ b/drivers/iio/pressure/bmp280.h
> @@ -112,7 +112,6 @@ int bmp280_common_probe(struct device *dev,
>  			unsigned int chip,
>  			const char *name,
>  			int irq);
> -int bmp280_common_remove(struct device *dev);
>  
>  /* PM ops */
>  extern const struct dev_pm_ops bmp280_dev_pm_ops;