linux-kernel - Re: [PATCH] iio: temperature: tmp007: use device-managed functions in probe

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Date:   Mon, 15 Mar 2021 09:53:32 +0530
From:   Manivannan Sadhasivam <manivannanece23@...il.com>
To:     Alexandru Ardelean <aardelean@...iqon.com>
Cc:     linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        jic23@...nel.org, linux@...iqon.com
Subject: Re: [PATCH] iio: temperature: tmp007: use device-managed functions
 in probe

On Wed, Mar 10, 2021 at 11:38:00AM +0200, Alexandru Ardelean wrote:
> This change converts the driver to use device-managed functions in the
> probe function. The power-down call is handled now via a
> devm_add_action_or_reset() hook, and then devm_iio_device_register() can be
> used to register the IIO device.
> 
> The final aim here would be for IIO to export only the device-managed
> functions of it's API. That's a long way to go and this a small step in
> that direction.
> 
> Signed-off-by: Alexandru Ardelean <aardelean@...iqon.com>

Reviewed-by: Manivannan Sadhasivam <manivannanece23@...il.com>

Thanks,
Mani

> ---
>  drivers/iio/temperature/tmp007.c | 36 +++++++++++++-------------------
>  1 file changed, 15 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/iio/temperature/tmp007.c b/drivers/iio/temperature/tmp007.c
> index ad2b35c65548..b422371a4674 100644
> --- a/drivers/iio/temperature/tmp007.c
> +++ b/drivers/iio/temperature/tmp007.c
> @@ -439,6 +439,13 @@ static bool tmp007_identify(struct i2c_client *client)
>  	return (manf_id == TMP007_MANUFACTURER_MAGIC && dev_id == TMP007_DEVICE_MAGIC);
>  }
>  
> +static void tmp007_powerdown_action_cb(void *priv)
> +{
> +	struct tmp007_data *data = priv;
> +
> +	tmp007_powerdown(data);
> +}
> +
>  static int tmp007_probe(struct i2c_client *client,
>  			const struct i2c_device_id *tmp007_id)
>  {
> @@ -489,6 +496,10 @@ static int tmp007_probe(struct i2c_client *client,
>  	if (ret < 0)
>  		return ret;
>  
> +	ret = devm_add_action_or_reset(&client->dev, tmp007_powerdown_action_cb, data);
> +	if (ret)
> +		return ret;
> +
>  	/*
>  	 * Only the following flags can activate ALERT pin. Data conversion/validity flags
>  	 * flags can still be polled for getting temperature data
> @@ -502,7 +513,7 @@ static int tmp007_probe(struct i2c_client *client,
>  
>  	ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS_MASK);
>  	if (ret < 0)
> -		goto error_powerdown;
> +		return ret;
>  
>  	data->status_mask = ret;
>  	data->status_mask |= (TMP007_STATUS_OHF | TMP007_STATUS_OLF
> @@ -510,7 +521,7 @@ static int tmp007_probe(struct i2c_client *client,
>  
>  	ret = i2c_smbus_write_word_swapped(data->client, TMP007_STATUS_MASK, data->status_mask);
>  	if (ret < 0)
> -		goto error_powerdown;
> +		return ret;
>  
>  	if (client->irq) {
>  		ret = devm_request_threaded_irq(&client->dev, client->irq,
> @@ -519,27 +530,11 @@ static int tmp007_probe(struct i2c_client *client,
>  				tmp007_id->name, indio_dev);
>  		if (ret) {
>  			dev_err(&client->dev, "irq request error %d\n", -ret);
> -			goto error_powerdown;
> +			return ret;
>  		}
>  	}
>  
> -	return iio_device_register(indio_dev);
> -
> -error_powerdown:
> -	tmp007_powerdown(data);
> -
> -	return ret;
> -}
> -
> -static int tmp007_remove(struct i2c_client *client)
> -{
> -	struct iio_dev *indio_dev = i2c_get_clientdata(client);
> -	struct tmp007_data *data = iio_priv(indio_dev);
> -
> -	iio_device_unregister(indio_dev);
> -	tmp007_powerdown(data);
> -
> -	return 0;
> +	return devm_iio_device_register(&client->dev, indio_dev);
>  }
>  
>  #ifdef CONFIG_PM_SLEEP
> @@ -582,7 +577,6 @@ static struct i2c_driver tmp007_driver = {
>  		.pm	= &tmp007_pm_ops,
>  	},
>  	.probe		= tmp007_probe,
> -	.remove		= tmp007_remove,
>  	.id_table	= tmp007_id,
>  };
>  module_i2c_driver(tmp007_driver);
> -- 
> 2.29.2
>