Commit 5d9e8b3f authored by Adamski, Krzysztof (Nokia - PL/Wroclaw)'s avatar Adamski, Krzysztof (Nokia - PL/Wroclaw) Committed by Guenter Roeck
Browse files

hwmon: (lm25066) Support SAMPLES_FOR_AVG register 



Manufacturer specific SAMPLES_FOR_AVG register allows setting the number
of samples used in computing the average values (PMBUS_VIRT_READ_*_AVG).
The number we write is an exponent of base 2 of the number of samples so
for example writing 3 will result in 8 samples average.

Signed-off-by: default avatarKrzysztof Adamski <krzysztof.adamski@nokia.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent bfe033a0

drivers/hwmon/pmbus/lm25066.c

+16 −1
Original line number Diff line number Diff line
@@ -26,6 +26,7 @@ 
#include <linux/err.h>

#include <linux/slab.h>

#include <linux/i2c.h>

#include <linux/log2.h>

#include "pmbus.h"



enum chips { lm25056, lm25066, lm5064, lm5066, lm5066i };
@@ -39,12 +40,15 @@ enum chips { lm25056, lm25066, lm5064, lm5066, lm5066i }; 
#define LM25066_CLEAR_PIN_PEAK		0xd6

#define LM25066_DEVICE_SETUP		0xd9

#define LM25066_READ_AVG_VIN		0xdc

#define LM25066_SAMPLES_FOR_AVG		0xdb

#define LM25066_READ_AVG_VOUT		0xdd

#define LM25066_READ_AVG_IIN		0xde

#define LM25066_READ_AVG_PIN		0xdf



#define LM25066_DEV_SETUP_CL		BIT(4)	/* Current limit */



#define LM25066_SAMPLES_FOR_AVG_MAX	4096



/* LM25056 only */



#define LM25056_VAUX_OV_WARN_LIMIT	0xe3
@@ -284,6 +288,12 @@ static int lm25066_read_word_data(struct i2c_client *client, int page, int reg) 
	case PMBUS_VIRT_RESET_PIN_HISTORY:

		ret = 0;

		break;

	case PMBUS_VIRT_SAMPLES:

		ret = pmbus_read_byte_data(client, 0, LM25066_SAMPLES_FOR_AVG);

		if (ret < 0)

			break;

		ret = 1 << ret;

		break;

	default:

		ret = -ENODATA;

		break;
@@ -398,6 +408,11 @@ static int lm25066_write_word_data(struct i2c_client *client, int page, int reg, 
	case PMBUS_VIRT_RESET_PIN_HISTORY:

		ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK);

		break;

	case PMBUS_VIRT_SAMPLES:

		word = clamp_val(word, 1, LM25066_SAMPLES_FOR_AVG_MAX);

		ret = pmbus_write_byte_data(client, 0, LM25066_SAMPLES_FOR_AVG,

					    ilog2(word));

		break;

	default:

		ret = -ENODATA;

		break;
@@ -438,7 +453,7 @@ static int lm25066_probe(struct i2c_client *client, 


	info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VMON

	  | PMBUS_HAVE_PIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT

	  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;

	  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_SAMPLES;



	if (data->id == lm25056) {

		info->func[0] |= PMBUS_HAVE_STATUS_VMON;

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