Re: [PATCH v2 2/2] adm1275: support PMBUS_VIRT_*_SAMPLES

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On Wed, May 29, 2019 at 02:36:21PM +0000, Adamski, Krzysztof (Nokia - PL/Wroclaw) wrote:
> The device supports setting the number of samples for averaging the
> measurements. There are two separate settings - PWR_AVG for averaging
> PIN and VI_AVG for averaging VIN/VAUX/IOUT, both being part of
> PMON_CONFIG register. The values are stored as exponent of base 2 of the
> actual number of samples that will be taken.
> 
> Signed-off-by: Krzysztof Adamski <krzysztof.adamski@xxxxxxxxx>
> Reviewed-by: Alexander Sverdlin <alexander.sverdlin@xxxxxxxxx>

Applied.

Thanks,
Guenter

> ---
> 
> Changes in v2:
> - Moved mutex lock to pmbus_set_samples (see patch 1/2)
> - Changed mask type passed as argument to adm1275_read_pmon_config and
>   adm1275_write_pmon_config to u16
> - Changed 1 << ret to BIT(ret)
> 
>  drivers/hwmon/pmbus/adm1275.c | 61 ++++++++++++++++++++++++++++++++++-
>  1 file changed, 60 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hwmon/pmbus/adm1275.c b/drivers/hwmon/pmbus/adm1275.c
> index f569372c9204..0c3493fa53ea 100644
> --- a/drivers/hwmon/pmbus/adm1275.c
> +++ b/drivers/hwmon/pmbus/adm1275.c
> @@ -23,6 +23,8 @@
>  #include <linux/slab.h>
>  #include <linux/i2c.h>
>  #include <linux/bitops.h>
> +#include <linux/bitfield.h>
> +#include <linux/log2.h>
>  #include "pmbus.h"
>  
>  enum chips { adm1075, adm1272, adm1275, adm1276, adm1278, adm1293, adm1294 };
> @@ -78,6 +80,10 @@ enum chips { adm1075, adm1272, adm1275, adm1276, adm1278, adm1293, adm1294 };
>  #define ADM1075_VAUX_OV_WARN		BIT(7)
>  #define ADM1075_VAUX_UV_WARN		BIT(6)
>  
> +#define ADM1275_PWR_AVG_MASK		GENMASK(13, 11)
> +#define ADM1275_VI_AVG_MASK		GENMASK(10, 8)
> +#define ADM1275_SAMPLES_AVG_MAX	128
> +
>  struct adm1275_data {
>  	int id;
>  	bool have_oc_fault;
> @@ -164,6 +170,34 @@ static const struct coefficients adm1293_coefficients[] = {
>  	[18] = { 7658, 0, -3 },		/* power, 21V, irange200 */
>  };
>  
> +static inline int adm1275_read_pmon_config(struct i2c_client *client, u16 mask)
> +{
> +	int ret;
> +
> +	ret = i2c_smbus_read_word_data(client, ADM1275_PMON_CONFIG);
> +	if (ret < 0)
> +		return ret;
> +
> +	return FIELD_GET(mask, (u16)ret);
> +}
> +
> +static inline int adm1275_write_pmon_config(struct i2c_client *client, u16 mask,
> +					    u16 word)
> +{
> +	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
> +	struct adm1275_data *data = to_adm1275_data(info);
> +	int ret;
> +
> +	ret = i2c_smbus_read_word_data(client, ADM1275_PMON_CONFIG);
> +	if (ret < 0)
> +		return ret;
> +
> +	word = FIELD_PREP(mask, word) | (ret & ~mask);
> +	ret = i2c_smbus_write_word_data(client, ADM1275_PMON_CONFIG, word);
> +
> +	return ret;
> +}
> +
>  static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
>  {
>  	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
> @@ -242,6 +276,19 @@ static int adm1275_read_word_data(struct i2c_client *client, int page, int reg)
>  		if (!data->have_temp_max)
>  			return -ENXIO;
>  		break;
> +	case PMBUS_VIRT_POWER_SAMPLES:
> +		ret = adm1275_read_pmon_config(client, ADM1275_PWR_AVG_MASK);
> +		if (ret < 0)
> +			break;
> +		ret = BIT(ret);
> +		break;
> +	case PMBUS_VIRT_IN_SAMPLES:
> +	case PMBUS_VIRT_CURR_SAMPLES:
> +		ret = adm1275_read_pmon_config(client, ADM1275_VI_AVG_MASK);
> +		if (ret < 0)
> +			break;
> +		ret = BIT(ret);
> +		break;
>  	default:
>  		ret = -ENODATA;
>  		break;
> @@ -286,6 +333,17 @@ static int adm1275_write_word_data(struct i2c_client *client, int page, int reg,
>  	case PMBUS_VIRT_RESET_TEMP_HISTORY:
>  		ret = pmbus_write_word_data(client, 0, ADM1278_PEAK_TEMP, 0);
>  		break;
> +	case PMBUS_VIRT_POWER_SAMPLES:
> +		word = clamp_val(word, 1, ADM1275_SAMPLES_AVG_MAX);
> +		ret = adm1275_write_pmon_config(client, ADM1275_PWR_AVG_MASK,
> +						ilog2(word));
> +		break;
> +	case PMBUS_VIRT_IN_SAMPLES:
> +	case PMBUS_VIRT_CURR_SAMPLES:
> +		word = clamp_val(word, 1, ADM1275_SAMPLES_AVG_MAX);
> +		ret = adm1275_write_pmon_config(client, ADM1275_VI_AVG_MASK,
> +						ilog2(word));
> +		break;
>  	default:
>  		ret = -ENODATA;
>  		break;
> @@ -439,7 +497,8 @@ static int adm1275_probe(struct i2c_client *client,
>  	info->format[PSC_CURRENT_OUT] = direct;
>  	info->format[PSC_POWER] = direct;
>  	info->format[PSC_TEMPERATURE] = direct;
> -	info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
> +	info->func[0] = PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
> +			PMBUS_HAVE_SAMPLES;
>  
>  	info->read_word_data = adm1275_read_word_data;
>  	info->read_byte_data = adm1275_read_byte_data;



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