linux-kernel - Re: [PATCH v4 5/7] iio: accel: adxl345: Pass function pointer to core

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Message-ID: <20240325203439.4c418016@jic23-huawei>
Date: Mon, 25 Mar 2024 20:34:39 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Lothar Rubusch <l.rubusch@...il.com>
Cc: lars@...afoo.de, Michael.Hennerich@...log.com, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, eraretuya@...il.com
Subject: Re: [PATCH v4 5/7] iio: accel: adxl345: Pass function pointer to
 core

On Mon, 25 Mar 2024 15:33:54 +0000
Lothar Rubusch <l.rubusch@...il.com> wrote:

> Add a function pointer argument to the probe function in
> the core module to provide a way to pre-configure the bus.
> 
> The passed setup function can be prepared in the bus
> specific spi or the i2c module, or NULL otherwise. It shall
> then be executed in the bus independent core module.

Wrap descriptions at 75 chars, not around 60 as you've done here.

> 
> Signed-off-by: Lothar Rubusch <l.rubusch@...il.com>
> ---
>  drivers/iio/accel/adxl345.h      |  3 ++-
>  drivers/iio/accel/adxl345_core.c | 10 +++++++++-
>  drivers/iio/accel/adxl345_i2c.c  |  2 +-
>  drivers/iio/accel/adxl345_spi.c  |  2 +-
>  4 files changed, 13 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/iio/accel/adxl345.h b/drivers/iio/accel/adxl345.h
> index ee169fed4..620a2e0f0 100644
> --- a/drivers/iio/accel/adxl345.h
> +++ b/drivers/iio/accel/adxl345.h
> @@ -59,6 +59,7 @@ struct adxl345_chip_info {
>  	int uscale;
>  };
>  
> -int adxl345_core_probe(struct device *dev, struct regmap *regmap);
> +int adxl345_core_probe(struct device *dev, struct regmap *regmap,
> +		       int (*setup)(struct device*, struct regmap*));
>  
>  #endif /* _ADXL345_H_ */
> diff --git a/drivers/iio/accel/adxl345_core.c b/drivers/iio/accel/adxl345_core.c
> index eba9c048a..476d729bc 100644
> --- a/drivers/iio/accel/adxl345_core.c
> +++ b/drivers/iio/accel/adxl345_core.c
> @@ -168,13 +168,21 @@ static void adxl345_powerdown(void *regmap)
>  	regmap_write(regmap, ADXL345_REG_POWER_CTL, ADXL345_POWER_CTL_STANDBY);
>  }
>  
> -int adxl345_core_probe(struct device *dev, struct regmap *regmap)
> +int adxl345_core_probe(struct device *dev, struct regmap *regmap,
> +	int (*setup)(struct device*, struct regmap*))

Wrap as per the header definition above. (align just after opening bracket).

>  {
>  	struct adxl345_data *data;
>  	struct iio_dev *indio_dev;
>  	u32 regval;
>  	int ret;
>  
> +	/* Perform optional initial bus specific configuration */
> +	if (setup) {
> +		ret = setup(dev, regmap);
> +		if (ret)
> +			return ret;
> +	}
> +
>  	ret = regmap_read(regmap, ADXL345_REG_DEVID, &regval);
>  	if (ret < 0)
>  		return dev_err_probe(dev, ret, "Error reading device ID\n");
> diff --git a/drivers/iio/accel/adxl345_i2c.c b/drivers/iio/accel/adxl345_i2c.c
> index a3084b0a8..4065b8f7c 100644
> --- a/drivers/iio/accel/adxl345_i2c.c
> +++ b/drivers/iio/accel/adxl345_i2c.c
> @@ -27,7 +27,7 @@ static int adxl345_i2c_probe(struct i2c_client *client)
>  	if (IS_ERR(regmap))
>  		return dev_err_probe(&client->dev, PTR_ERR(regmap), "Error initializing regmap\n");
>  
> -	return adxl345_core_probe(&client->dev, regmap);
> +	return adxl345_core_probe(&client->dev, regmap, NULL);
>  }
>  
>  static const struct adxl345_chip_info adxl345_i2c_info = {
> diff --git a/drivers/iio/accel/adxl345_spi.c b/drivers/iio/accel/adxl345_spi.c
> index 93ca349f1..1c0513bd3 100644
> --- a/drivers/iio/accel/adxl345_spi.c
> +++ b/drivers/iio/accel/adxl345_spi.c
> @@ -33,7 +33,7 @@ static int adxl345_spi_probe(struct spi_device *spi)
>  	if (IS_ERR(regmap))
>  		return dev_err_probe(&spi->dev, PTR_ERR(regmap), "Error initializing regmap\n");
>  
> -	return adxl345_core_probe(&spi->dev, regmap);
> +	return adxl345_core_probe(&spi->dev, regmap, NULL);
>  }
>  
>  static const struct adxl345_chip_info adxl345_spi_info = {