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hwmon: (pmbus) Add client driver for IR35221

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IR35221 is a Digital DC-DC Multiphase Converter

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
[groeck: Preserve alphabetic order in Kconfig;
	add missing break statements (from Dan Carpenter);
	add missing error checks]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Samuel Mendoza-Jonas 2017-05-01 10:39:01 +10:00 committed by Guenter Roeck
parent 419220dc48
commit 8991ebd9c9
4 changed files with 435 additions and 0 deletions
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87
Documentation/hwmon/ir35221 Normal file
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@ -0,0 +1,87 @@
Kernel driver ir35221
=====================
Supported chips:
* Infinion IR35221
Prefix: 'ir35221'
Addresses scanned: -
Datasheet: Datasheet is not publicly available.
Author: Samuel Mendoza-Jonas <sam@mendozajonas.com>
Description
-----------
IR35221 is a Digital DC-DC Multiphase Converter
Usage Notes
-----------
This driver does not probe for PMBus devices. You will have to instantiate
devices explicitly.
Example: the following commands will load the driver for an IR35221
at address 0x70 on I2C bus #4:
# modprobe ir35221
# echo ir35221 0x70 > /sys/bus/i2c/devices/i2c-4/new_device
Sysfs attributes
----------------
curr1_label "iin"
curr1_input Measured input current
curr1_max Maximum current
curr1_max_alarm Current high alarm
curr[2-3]_label "iout[1-2]"
curr[2-3]_input Measured output current
curr[2-3]_crit Critical maximum current
curr[2-3]_crit_alarm Current critical high alarm
curr[2-3]_highest Highest output current
curr[2-3]_lowest Lowest output current
curr[2-3]_max Maximum current
curr[2-3]_max_alarm Current high alarm
in1_label "vin"
in1_input Measured input voltage
in1_crit Critical maximum input voltage
in1_crit_alarm Input voltage critical high alarm
in1_highest Highest input voltage
in1_lowest Lowest input voltage
in1_min Minimum input voltage
in1_min_alarm Input voltage low alarm
in[2-3]_label "vout[1-2]"
in[2-3]_input Measured output voltage
in[2-3]_lcrit Critical minimum output voltage
in[2-3]_lcrit_alarm Output voltage critical low alarm
in[2-3]_crit Critical maximum output voltage
in[2-3]_crit_alarm Output voltage critical high alarm
in[2-3]_highest Highest output voltage
in[2-3]_lowest Lowest output voltage
in[2-3]_max Maximum output voltage
in[2-3]_max_alarm Output voltage high alarm
in[2-3]_min Minimum output voltage
in[2-3]_min_alarm Output voltage low alarm
power1_label "pin"
power1_input Measured input power
power1_alarm Input power high alarm
power1_max Input power limit
power[2-3]_label "pout[1-2]"
power[2-3]_input Measured output power
power[2-3]_max Output power limit
power[2-3]_max_alarm Output power high alarm
temp[1-2]_input Measured temperature
temp[1-2]_crit Critical high temperature
temp[1-2]_crit_alarm Chip temperature critical high alarm
temp[1-2]_highest Highest temperature
temp[1-2]_lowest Lowest temperature
temp[1-2]_max Maximum temperature
temp[1-2]_max_alarm Chip temperature high alarm

10
drivers/hwmon/pmbus/Kconfig
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@ -37,6 +37,16 @@ config SENSORS_ADM1275
This driver can also be built as a module. If so, the module will
be called adm1275.
config SENSORS_IR35221
tristate "Infineon IR35221"
default n
help
If you say yes here you get hardware monitoring support for the
Infineon IR35221 controller.
This driver can also be built as a module. If so, the module will
be called ir35521.
config SENSORS_LM25066
tristate "National Semiconductor LM25066 and compatibles"
default n

1
drivers/hwmon/pmbus/Makefile
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@ -5,6 +5,7 @@
obj-$(CONFIG_PMBUS) += pmbus_core.o
obj-$(CONFIG_SENSORS_PMBUS) += pmbus.o
obj-$(CONFIG_SENSORS_ADM1275) += adm1275.o
obj-$(CONFIG_SENSORS_IR35221) += ir35221.o
obj-$(CONFIG_SENSORS_LM25066) += lm25066.o
obj-$(CONFIG_SENSORS_LTC2978) += ltc2978.o
obj-$(CONFIG_SENSORS_LTC3815) += ltc3815.o

337
drivers/hwmon/pmbus/ir35221.c Normal file
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/*
* Hardware monitoring driver for IR35221
*
* Copyright (C) IBM Corporation 2017.
*
* 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 the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include "pmbus.h"
#define IR35221_MFR_VIN_PEAK 0xc5
#define IR35221_MFR_VOUT_PEAK 0xc6
#define IR35221_MFR_IOUT_PEAK 0xc7
#define IR35221_MFR_TEMP_PEAK 0xc8
#define IR35221_MFR_VIN_VALLEY 0xc9
#define IR35221_MFR_VOUT_VALLEY 0xca
#define IR35221_MFR_IOUT_VALLEY 0xcb
#define IR35221_MFR_TEMP_VALLEY 0xcc
static long ir35221_reg2data(int data, enum pmbus_sensor_classes class)
{
s16 exponent;
s32 mantissa;
long val;
/* We only modify LINEAR11 formats */
exponent = ((s16)data) >> 11;
mantissa = ((s16)((data & 0x7ff) << 5)) >> 5;
val = mantissa * 1000L;
/* scale result to micro-units for power sensors */
if (class == PSC_POWER)
val = val * 1000L;
if (exponent >= 0)
val <<= exponent;
else
val >>= -exponent;
return val;
}
#define MAX_MANTISSA (1023 * 1000)
#define MIN_MANTISSA (511 * 1000)
static u16 ir35221_data2reg(long val, enum pmbus_sensor_classes class)
{
s16 exponent = 0, mantissa;
bool negative = false;
if (val == 0)
return 0;
if (val < 0) {
negative = true;
val = -val;
}
/* Power is in uW. Convert to mW before converting. */
if (class == PSC_POWER)
val = DIV_ROUND_CLOSEST(val, 1000L);
/* Reduce large mantissa until it fits into 10 bit */
while (val >= MAX_MANTISSA && exponent < 15) {
exponent++;
val >>= 1;
}
/* Increase small mantissa to improve precision */
while (val < MIN_MANTISSA && exponent > -15) {
exponent--;
val <<= 1;
}
/* Convert mantissa from milli-units to units */
mantissa = DIV_ROUND_CLOSEST(val, 1000);
/* Ensure that resulting number is within range */
if (mantissa > 0x3ff)
mantissa = 0x3ff;
/* restore sign */
if (negative)
mantissa = -mantissa;
/* Convert to 5 bit exponent, 11 bit mantissa */
return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
}
static u16 ir35221_scale_result(s16 data, int shift,
enum pmbus_sensor_classes class)
{
long val;
val = ir35221_reg2data(data, class);
if (shift < 0)
val >>= -shift;
else
val <<= shift;
return ir35221_data2reg(val, class);
}
static int ir35221_read_word_data(struct i2c_client *client, int page, int reg)
{
int ret;
switch (reg) {
case PMBUS_IOUT_OC_FAULT_LIMIT:
case PMBUS_IOUT_OC_WARN_LIMIT:
ret = pmbus_read_word_data(client, page, reg);
if (ret < 0)
break;
ret = ir35221_scale_result(ret, 1, PSC_CURRENT_OUT);
break;
case PMBUS_VIN_OV_FAULT_LIMIT:
case PMBUS_VIN_OV_WARN_LIMIT:
case PMBUS_VIN_UV_WARN_LIMIT:
ret = pmbus_read_word_data(client, page, reg);
ret = ir35221_scale_result(ret, -4, PSC_VOLTAGE_IN);
break;
case PMBUS_IIN_OC_WARN_LIMIT:
ret = pmbus_read_word_data(client, page, reg);
if (ret < 0)
break;
ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN);
break;
case PMBUS_READ_VIN:
ret = pmbus_read_word_data(client, page, PMBUS_READ_VIN);
if (ret < 0)
break;
ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN);
break;
case PMBUS_READ_IIN:
ret = pmbus_read_word_data(client, page, PMBUS_READ_IIN);
if (ret < 0)
break;
if (page == 0)
ret = ir35221_scale_result(ret, -4, PSC_CURRENT_IN);
else
ret = ir35221_scale_result(ret, -5, PSC_CURRENT_IN);
break;
case PMBUS_READ_POUT:
ret = pmbus_read_word_data(client, page, PMBUS_READ_POUT);
if (ret < 0)
break;
ret = ir35221_scale_result(ret, -1, PSC_POWER);
break;
case PMBUS_READ_PIN:
ret = pmbus_read_word_data(client, page, PMBUS_READ_PIN);
if (ret < 0)
break;
ret = ir35221_scale_result(ret, -1, PSC_POWER);
break;
case PMBUS_READ_IOUT:
ret = pmbus_read_word_data(client, page, PMBUS_READ_IOUT);
if (ret < 0)
break;
if (page == 0)
ret = ir35221_scale_result(ret, -1, PSC_CURRENT_OUT);
else
ret = ir35221_scale_result(ret, -2, PSC_CURRENT_OUT);
break;
case PMBUS_VIRT_READ_VIN_MAX:
ret = pmbus_read_word_data(client, page, IR35221_MFR_VIN_PEAK);
if (ret < 0)
break;
ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN);
break;
case PMBUS_VIRT_READ_VOUT_MAX:
ret = pmbus_read_word_data(client, page, IR35221_MFR_VOUT_PEAK);
break;
case PMBUS_VIRT_READ_IOUT_MAX:
ret = pmbus_read_word_data(client, page, IR35221_MFR_IOUT_PEAK);
if (ret < 0)
break;
if (page == 0)
ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN);
else
ret = ir35221_scale_result(ret, -2, PSC_CURRENT_IN);
break;
case PMBUS_VIRT_READ_TEMP_MAX:
ret = pmbus_read_word_data(client, page, IR35221_MFR_TEMP_PEAK);
break;
case PMBUS_VIRT_READ_VIN_MIN:
ret = pmbus_read_word_data(client, page,
IR35221_MFR_VIN_VALLEY);
if (ret < 0)
break;
ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN);
break;
case PMBUS_VIRT_READ_VOUT_MIN:
ret = pmbus_read_word_data(client, page,
IR35221_MFR_VOUT_VALLEY);
break;
case PMBUS_VIRT_READ_IOUT_MIN:
ret = pmbus_read_word_data(client, page,
IR35221_MFR_IOUT_VALLEY);
if (ret < 0)
break;
if (page == 0)
ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN);
else
ret = ir35221_scale_result(ret, -2, PSC_CURRENT_IN);
break;
case PMBUS_VIRT_READ_TEMP_MIN:
ret = pmbus_read_word_data(client, page,
IR35221_MFR_TEMP_VALLEY);
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static int ir35221_write_word_data(struct i2c_client *client, int page, int reg,
u16 word)
{
int ret;
u16 val;
switch (reg) {
case PMBUS_IOUT_OC_FAULT_LIMIT:
case PMBUS_IOUT_OC_WARN_LIMIT:
val = ir35221_scale_result(word, -1, PSC_CURRENT_OUT);
ret = pmbus_write_word_data(client, page, reg, val);
break;
case PMBUS_VIN_OV_FAULT_LIMIT:
case PMBUS_VIN_OV_WARN_LIMIT:
case PMBUS_VIN_UV_WARN_LIMIT:
val = ir35221_scale_result(word, 4, PSC_VOLTAGE_IN);
ret = pmbus_write_word_data(client, page, reg, val);
break;
case PMBUS_IIN_OC_WARN_LIMIT:
val = ir35221_scale_result(word, 1, PSC_CURRENT_IN);
ret = pmbus_write_word_data(client, page, reg, val);
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static int ir35221_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct pmbus_driver_info *info;
u8 buf[I2C_SMBUS_BLOCK_MAX];
int ret;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA
| I2C_FUNC_SMBUS_READ_WORD_DATA
| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
return -ENODEV;
ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
if (ret < 0) {
dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
return ret;
}
if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) {
dev_err(&client->dev, "MFR_ID unrecognised\n");
return -ENODEV;
}
ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
if (ret < 0) {
dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
return ret;
}
if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) {
dev_err(&client->dev, "MFR_MODEL unrecognised\n");
return -ENODEV;
}
info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
GFP_KERNEL);
if (!info)
return -ENOMEM;
info->write_word_data = ir35221_write_word_data;
info->read_word_data = ir35221_read_word_data;
info->pages = 2;
info->format[PSC_VOLTAGE_IN] = linear;
info->format[PSC_VOLTAGE_OUT] = linear;
info->format[PSC_CURRENT_IN] = linear;
info->format[PSC_CURRENT_OUT] = linear;
info->format[PSC_POWER] = linear;
info->format[PSC_TEMPERATURE] = linear;
info->func[0] = PMBUS_HAVE_VIN
| PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
| PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
| PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
| PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP;
info->func[1] = info->func[0];
return pmbus_do_probe(client, id, info);
}
static const struct i2c_device_id ir35221_id[] = {
{"ir35221", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, ir35221_id);
static struct i2c_driver ir35221_driver = {
.driver = {
.name = "ir35221",
},
.probe = ir35221_probe,
.remove = pmbus_do_remove,
.id_table = ir35221_id,
};
module_i2c_driver(ir35221_driver);
MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com");
MODULE_DESCRIPTION("PMBus driver for IR35221");
MODULE_LICENSE("GPL");