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Commit 649ca820 authored by Guenter Roeck's avatar Guenter Roeck
Browse files

hwmon: (ltc2978) Add support for LTC2975 



LTC2975 is mostly compatible to LTC2974, but supports input current
and power measurement.

Tested-by: default avatarMichael Jones <mike@proclivis.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 15398566

Documentation/devicetree/bindings/hwmon/ltc2978.txt

+2 −1
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ ltc2978 
Required properties:

- compatible: should contain one of:

  * "lltc,ltc2974"

  * "lltc,ltc2975"

  * "lltc,ltc2977"

  * "lltc,ltc2978"

  * "lltc,ltc3880"
@@ -19,7 +20,7 @@ Optional properties: 
  standard binding for regulators; see regulator.txt.



Valid names of regulators depend on number of supplies supported per device:

  * ltc2974 : vout0 - vout3

  * ltc2974, ltc2975 : vout0 - vout3

  * ltc2977 : vout0 - vout7

  * ltc2978 : vout0 - vout7

  * ltc3880, ltc3882 : vout0 - vout1

Documentation/hwmon/ltc2978

+27 −20
Original line number Diff line number Diff line
@@ -6,6 +6,10 @@ Supported chips: 
    Prefix: 'ltc2974'

    Addresses scanned: -

    Datasheet: http://www.linear.com/product/ltc2974

  * Linear Technology LTC2975

    Prefix: 'ltc2975'

    Addresses scanned: -

    Datasheet: http://www.linear.com/product/ltc2975

  * Linear Technology LTC2977

    Prefix: 'ltc2977'

    Addresses scanned: -
@@ -42,7 +46,7 @@ Author: Guenter Roeck <linux@roeck-us.net> 
Description

-----------



LTC2974 is a quad digital power supply managers.

LTC2974 and LTC2975 are quad digital power supply managers.

LTC2978 is an octal power supply monitor.

LTC2977 is a pin compatible replacement for LTC2978.

LTC3880, LTC3882, and LTC3887 are dual output poly-phase step-down DC/DC
@@ -71,23 +75,23 @@ in1_label "vin" 
in1_input		Measured input voltage.

in1_min			Minimum input voltage.

in1_max			Maximum input voltage.

			LTC2974, LTC2977, and LTC2978 only.

			LTC2974, LTC2975, LTC2977, and LTC2978 only.

in1_lcrit		Critical minimum input voltage.

			LTC2974, LTC2977, and LTC2978 only.

			LTC2974, LTC2975, LTC2977, and LTC2978 only.

in1_crit		Critical maximum input voltage.

in1_min_alarm		Input voltage low alarm.

in1_max_alarm		Input voltage high alarm.

			LTC2974, LTC2977, and LTC2978 only.

			LTC2974, LTC2975, LTC2977, and LTC2978 only.

in1_lcrit_alarm		Input voltage critical low alarm.

			LTC2974, LTC2977, and LTC2978 only.

			LTC2974, LTC2975, LTC2977, and LTC2978 only.

in1_crit_alarm		Input voltage critical high alarm.

in1_lowest		Lowest input voltage.

			LTC2974, LTC2977, and LTC2978 only.

			LTC2974, LTC2975, LTC2977, and LTC2978 only.

in1_highest		Highest input voltage.

in1_reset_history	Reset input voltage history.



in[N]_label		"vout[1-8]".

			LTC2974: N=2-5

			LTC2974, LTC2975: N=2-5

			LTC2977: N=2-9

			LTC2978: N=2-9

			LTC3880, LTC3882, LTC3887, LTM4676: N=2-3
@@ -101,13 +105,14 @@ in[N]_min_alarm Output voltage low alarm. 
in[N]_max_alarm		Output voltage high alarm.

in[N]_lcrit_alarm	Output voltage critical low alarm.

in[N]_crit_alarm	Output voltage critical high alarm.

in[N]_lowest		Lowest output voltage. LTC2974 and LTC2978 only.

in[N]_lowest		Lowest output voltage. LTC2974, LTC2975,

			and LTC2978 only.

in[N]_highest		Highest output voltage.

in[N]_reset_history	Reset output voltage history.



temp[N]_input		Measured temperature.

			On LTC2974, temp[1-4] report external temperatures,

			and temp5 reports the chip temperature.

			On LTC2974 and LTC2975, temp[1-4] report external

			temperatures, and temp5 reports the chip temperature.

			On LTC2977 and LTC2978, only one temperature measurement

			is supported and reports the chip temperature.

			On LTC3880, LTC3882, LTC3887, and LTM4676, temp1 and
@@ -120,23 +125,24 @@ temp[N]_max Maximum temperature. 
temp[N]_lcrit		Critical low temperature.

temp[N]_crit		Critical high temperature.

temp[N]_min_alarm	Temperature low alarm.

			LTC2974, LTC2977, and LTC2978 only.

			LTC2974, LTC2975, LTC2977, and LTC2978 only.

temp[N]_max_alarm	Temperature high alarm.

temp[N]_lcrit_alarm	Temperature critical low alarm.

temp[N]_crit_alarm	Temperature critical high alarm.

temp[N]_lowest		Lowest measured temperature.

			LTC2974, LTC2977, and LTC2978 only.

			Not supported for chip temperature sensor on LTC2974.

			LTC2974, LTC2975, LTC2977, and LTC2978 only.

			Not supported for chip temperature sensor on LTC2974 and

			LTC2975.

temp[N]_highest		Highest measured temperature. Not supported for chip

			temperature sensor on LTC2974.

			temperature sensor on LTC2974 and LTC2975.

temp[N]_reset_history	Reset temperature history. Not supported for chip

			temperature sensor on LTC2974.

			temperature sensor on LTC2974 and LTC2975.



power1_label		"pin". LTC3883 only.

power1_input		Measured input power.



power[N]_label		"pout[1-4]".

			LTC2974: N=1-4

			LTC2974, LTC2975: N=1-4

			LTC2977: Not supported

			LTC2978: Not supported

			LTC3880, LTC3882, LTC3887, LTM4676: N=1-2
@@ -151,7 +157,7 @@ curr1_highest Highest input current. LTC3883 only. 
curr1_reset_history	Reset input current history. LTC3883 only.



curr[N]_label		"iout[1-4]".

			LTC2974: N=1-4

			LTC2974, LTC2975: N=1-4

			LTC2977: not supported

			LTC2978: not supported

			LTC3880, LTC3882, LTC3887, LTM4676: N=2-3
@@ -159,10 +165,11 @@ curr[N]_label "iout[1-4]". 
curr[N]_input		Measured output current.

curr[N]_max		Maximum output current.

curr[N]_crit		Critical high output current.

curr[N]_lcrit		Critical low output current. LTC2974 only.

curr[N]_lcrit		Critical low output current. LTC2974 and LTC2975 only.

curr[N]_max_alarm	Output current high alarm.

curr[N]_crit_alarm	Output current critical high alarm.

curr[N]_lcrit_alarm	Output current critical low alarm. LTC2974 only.

curr[N]_lowest		Lowest output current. LTC2974 only.

curr[N]_lcrit_alarm	Output current critical low alarm.

			LTC2974 and LTC2975 only.

curr[N]_lowest		Lowest output current. LTC2974 and LTC2975 only.

curr[N]_highest		Highest output current.

curr[N]_reset_history	Reset output current history.

drivers/hwmon/pmbus/Kconfig

+2 −2
Original line number Diff line number Diff line
@@ -52,8 +52,8 @@ config SENSORS_LTC2978 
	default n

	help

	  If you say yes here you get hardware monitoring support for Linear

	  Technology LTC2974, LTC2977, LTC2978, LTC3880, LTC3883, LTC3887,

	  and LTM4676.

	  Technology LTC2974, LTC2975, LTC2977, LTC2978, LTC3880, LTC3883,

	  LTC3887, and LTM4676.



	  This driver can also be built as a module. If so, the module will

	  be called ltc2978.

drivers/hwmon/pmbus/ltc2978.c

+94 −10
Original line number Diff line number Diff line 
/*

 * Hardware monitoring driver for LTC2974, LTC2977, LTC2978, LTC3880,

 * LTC3883, LTC3887. and LTM4676

 * Hardware monitoring driver for LTC2978 and compatible chips.

 *

 * Copyright (c) 2011 Ericsson AB.

 * Copyright (c) 2013, 2014 Guenter Roeck

 * Copyright (c) 2013, 2014, 2015 Guenter Roeck

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by
@@ -25,8 +24,8 @@ 
#include <linux/regulator/driver.h>

#include "pmbus.h"



enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltc3887,

	     ltm4676 };

enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883,

	     ltc3887, ltm4676 };



/* Common for all chips */

#define LTC2978_MFR_VOUT_PEAK		0xdd
@@ -34,12 +33,12 @@ enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltc3887, 
#define LTC2978_MFR_TEMPERATURE_PEAK	0xdf

#define LTC2978_MFR_SPECIAL_ID		0xe7	/* Not on LTC3882 */



/* LTC2974, LCT2977, and LTC2978 */

/* LTC2974, LTC2975, LCT2977, and LTC2978 */

#define LTC2978_MFR_VOUT_MIN		0xfb

#define LTC2978_MFR_VIN_MIN		0xfc

#define LTC2978_MFR_TEMPERATURE_MIN	0xfd



/* LTC2974 only */

/* LTC2974, LTC2975 */

#define LTC2974_MFR_IOUT_PEAK		0xd7

#define LTC2974_MFR_IOUT_MIN		0xd8
@@ -51,8 +50,15 @@ enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3882, ltc3883, ltc3887, 
/* LTC3883 only */

#define LTC3883_MFR_IIN_PEAK		0xe1



/* LTC2975 only */

#define LTC2975_MFR_IIN_PEAK		0xc4

#define LTC2975_MFR_IIN_MIN		0xc5

#define LTC2975_MFR_PIN_PEAK		0xc6

#define LTC2975_MFR_PIN_MIN		0xc7



#define LTC2974_ID_REV1			0x0212

#define LTC2974_ID_REV2			0x0213

#define LTC2975_ID			0x0223

#define LTC2977_ID			0x0130

#define LTC2978_ID_REV1			0x0121

#define LTC2978_ID_REV2			0x0122
@@ -87,7 +93,8 @@ struct ltc2978_data { 
	u16 temp_min[LTC2974_NUM_PAGES], temp_max[LTC2974_NUM_PAGES];

	u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES];

	u16 iout_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES];

	u16 iin_max;

	u16 iin_min, iin_max;

	u16 pin_min, pin_max;

	u16 temp2_max;

	struct pmbus_driver_info info;

};
@@ -246,6 +253,60 @@ static int ltc2974_read_word_data(struct i2c_client *client, int page, int reg) 
	return ret;

}



static int ltc2975_read_word_data(struct i2c_client *client, int page, int reg)

{

	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);

	struct ltc2978_data *data = to_ltc2978_data(info);

	int ret;



	switch (reg) {

	case PMBUS_VIRT_READ_IIN_MAX:

		ret = pmbus_read_word_data(client, page, LTC2975_MFR_IIN_PEAK);

		if (ret >= 0) {

			if (lin11_to_val(ret)

			    > lin11_to_val(data->iin_max))

				data->iin_max = ret;

			ret = data->iin_max;

		}

		break;

	case PMBUS_VIRT_READ_IIN_MIN:

		ret = pmbus_read_word_data(client, page, LTC2975_MFR_IIN_MIN);

		if (ret >= 0) {

			if (lin11_to_val(ret)

			    < lin11_to_val(data->iin_min))

				data->iin_min = ret;

			ret = data->iin_min;

		}

		break;

	case PMBUS_VIRT_READ_PIN_MAX:

		ret = pmbus_read_word_data(client, page, LTC2975_MFR_PIN_PEAK);

		if (ret >= 0) {

			if (lin11_to_val(ret)

			    > lin11_to_val(data->pin_max))

				data->pin_max = ret;

			ret = data->pin_max;

		}

		break;

	case PMBUS_VIRT_READ_PIN_MIN:

		ret = pmbus_read_word_data(client, page, LTC2975_MFR_PIN_MIN);

		if (ret >= 0) {

			if (lin11_to_val(ret)

			    < lin11_to_val(data->pin_min))

				data->pin_min = ret;

			ret = data->pin_min;

		}

		break;

	case PMBUS_VIRT_RESET_IIN_HISTORY:

	case PMBUS_VIRT_RESET_PIN_HISTORY:

		ret = 0;

		break;

	default:

		ret = ltc2978_read_word_data(client, page, reg);

		break;

	}

	return ret;

}



static int ltc3880_read_word_data(struct i2c_client *client, int page, int reg)

{

	const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
@@ -337,7 +398,13 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page, 
	switch (reg) {

	case PMBUS_VIRT_RESET_IIN_HISTORY:

		data->iin_max = 0x7c00;

		ret = ltc2978_clear_peaks(client, page, data->id);

		data->iin_min = 0x7bff;

		ret = ltc2978_clear_peaks(client, 0, data->id);

		break;

	case PMBUS_VIRT_RESET_PIN_HISTORY:

		data->pin_max = 0x7c00;

		data->pin_min = 0x7bff;

		ret = ltc2978_clear_peaks(client, 0, data->id);

		break;

	case PMBUS_VIRT_RESET_IOUT_HISTORY:

		data->iout_max[page] = 0x7c00;
@@ -372,6 +439,7 @@ static int ltc2978_write_word_data(struct i2c_client *client, int page, 


static const struct i2c_device_id ltc2978_id[] = {

	{"ltc2974", ltc2974},

	{"ltc2975", ltc2975},

	{"ltc2977", ltc2977},

	{"ltc2978", ltc2978},

	{"ltc3880", ltc3880},
@@ -428,6 +496,8 @@ static int ltc2978_get_id(struct i2c_client *client) 


	if (chip_id == LTC2974_ID_REV1 || chip_id == LTC2974_ID_REV2)

		return ltc2974;

	else if (chip_id == LTC2975_ID)

		return ltc2975;

	else if (chip_id == LTC2977_ID)

		return ltc2977;

	else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2 ||
@@ -505,6 +575,19 @@ static int ltc2978_probe(struct i2c_client *client, 
			  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;

		}

		break;

	case ltc2975:

		info->read_word_data = ltc2975_read_word_data;

		info->pages = LTC2974_NUM_PAGES;

		info->func[0] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN

		  | PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT

		  | PMBUS_HAVE_TEMP2;

		for (i = 0; i < info->pages; i++) {

			info->func[i] |= PMBUS_HAVE_VOUT

			  | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT

			  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP

			  | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;

		}

		break;

	case ltc2977:

	case ltc2978:

		info->read_word_data = ltc2978_read_word_data;
@@ -576,6 +659,7 @@ static int ltc2978_probe(struct i2c_client *client, 
#ifdef CONFIG_OF

static const struct of_device_id ltc2978_of_match[] = {

	{ .compatible = "lltc,ltc2974" },

	{ .compatible = "lltc,ltc2975" },

	{ .compatible = "lltc,ltc2977" },

	{ .compatible = "lltc,ltc2978" },

	{ .compatible = "lltc,ltc3880" },
@@ -601,5 +685,5 @@ static struct i2c_driver ltc2978_driver = { 
module_i2c_driver(ltc2978_driver);



MODULE_AUTHOR("Guenter Roeck");

MODULE_DESCRIPTION("PMBus driver for LTC2974, LTC2978, LTC3880, LTC3883, and LTM4676");

MODULE_DESCRIPTION("PMBus driver for LTC2978 and comppatible chips");

MODULE_LICENSE("GPL");