Re: [PATCH v4 2/4] hwmon: (pmbus) Use _pmbus_read_byte_data with callback

[Guenter Roeck <linux@roeck-us.net>]

On Thu, Apr 28, 2022 at 04:40:37PM +0200, Mårten Lindahl wrote:
> Some of the pmbus core functions uses pmbus_read_byte_data, which does
> not support driver callbacks for chip specific write operations. This
> could potentially influence some specific regulator chips that for
> example need a time delay before each data access.
> 
> Lets use _pmbus_read_byte_data with callback check.
> 
> Signed-off-by: Mårten Lindahl <marten.lindahl@axis.com>

Applied.

Thanks,
Guenter

> ---
>  drivers/hwmon/pmbus/pmbus_core.c | 46 ++++++++++++++++----------------
>  1 file changed, 23 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
> index 98da2db3f831..bd143ca0c320 100644
> --- a/drivers/hwmon/pmbus/pmbus_core.c
> +++ b/drivers/hwmon/pmbus/pmbus_core.c
> @@ -294,6 +294,24 @@ static int _pmbus_write_byte_data(struct i2c_client *client, int page, int reg,
>  	return pmbus_write_byte_data(client, page, reg, value);
>  }
>  
> +/*
> + * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
> + * a device specific mapping function exists and calls it if necessary.
> + */
> +static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg)
> +{
> +	struct pmbus_data *data = i2c_get_clientdata(client);
> +	const struct pmbus_driver_info *info = data->info;
> +	int status;
> +
> +	if (info->read_byte_data) {
> +		status = info->read_byte_data(client, page, reg);
> +		if (status != -ENODATA)
> +			return status;
> +	}
> +	return pmbus_read_byte_data(client, page, reg);
> +}
> +
>  int pmbus_update_fan(struct i2c_client *client, int page, int id,
>  		     u8 config, u8 mask, u16 command)
>  {
> @@ -301,7 +319,7 @@ int pmbus_update_fan(struct i2c_client *client, int page, int id,
>  	int rv;
>  	u8 to;
>  
> -	from = pmbus_read_byte_data(client, page,
> +	from = _pmbus_read_byte_data(client, page,
>  				    pmbus_fan_config_registers[id]);
>  	if (from < 0)
>  		return from;
> @@ -408,7 +426,7 @@ int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg,
>  	unsigned int tmp;
>  	int rv;
>  
> -	rv = pmbus_read_byte_data(client, page, reg);
> +	rv = _pmbus_read_byte_data(client, page, reg);
>  	if (rv < 0)
>  		return rv;
>  
> @@ -421,24 +439,6 @@ int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg,
>  }
>  EXPORT_SYMBOL_NS_GPL(pmbus_update_byte_data, PMBUS);
>  
> -/*
> - * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
> - * a device specific mapping function exists and calls it if necessary.
> - */
> -static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg)
> -{
> -	struct pmbus_data *data = i2c_get_clientdata(client);
> -	const struct pmbus_driver_info *info = data->info;
> -	int status;
> -
> -	if (info->read_byte_data) {
> -		status = info->read_byte_data(client, page, reg);
> -		if (status != -ENODATA)
> -			return status;
> -	}
> -	return pmbus_read_byte_data(client, page, reg);
> -}
> -
>  static struct pmbus_sensor *pmbus_find_sensor(struct pmbus_data *data, int page,
>  					      int reg)
>  {
> @@ -473,7 +473,7 @@ static int pmbus_get_fan_rate(struct i2c_client *client, int page, int id,
>  		return s->data;
>  	}
>  
> -	config = pmbus_read_byte_data(client, page,
> +	config = _pmbus_read_byte_data(client, page,
>  				      pmbus_fan_config_registers[id]);
>  	if (config < 0)
>  		return config;
> @@ -2414,7 +2414,7 @@ static int pmbus_regulator_is_enabled(struct regulator_dev *rdev)
>  	int ret;
>  
>  	mutex_lock(&data->update_lock);
> -	ret = pmbus_read_byte_data(client, page, PMBUS_OPERATION);
> +	ret = _pmbus_read_byte_data(client, page, PMBUS_OPERATION);
>  	mutex_unlock(&data->update_lock);
>  
>  	if (ret < 0)
> @@ -2513,7 +2513,7 @@ static int pmbus_regulator_get_error_flags(struct regulator_dev *rdev, unsigned
>  		if (!(func & cat->func))
>  			continue;
>  
> -		status = pmbus_read_byte_data(client, page, cat->reg);
> +		status = _pmbus_read_byte_data(client, page, cat->reg);
>  		if (status < 0) {
>  			mutex_unlock(&data->update_lock);
>  			return status;