hwmon: (pmbus) Add support for MPS Multi-phase mp5990

Add support for mp5990 device from Monolithic Power Systems, Inc. (MPS)
vendor. This is a Hot-Swap Controller.

Signed-off-by: Peter Yin <peteryin.openbmc@gmail.com>
Link: https://lore.kernel.org/r/20231113155008.2147090-3-peteryin.openbmc@gmail.com
[groeck: Improved and clarified comments]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Peter Yin 2023-11-13 23:50:08 +08:00 committed by Guenter Roeck
parent 599617301e
commit ce0742404a
5 changed files with 274 additions and 0 deletions

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@ -159,6 +159,7 @@ Hardware Monitoring Kernel Drivers
mp2888 mp2888
mp2975 mp2975
mp5023 mp5023
mp5990
nct6683 nct6683
nct6775 nct6775
nct7802 nct7802

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@ -0,0 +1,84 @@
.. SPDX-License-Identifier: GPL-2.0
Kernel driver mp5990
====================
Supported chips:
* MPS MP5990
Prefix: 'mp5990'
* Datasheet
Publicly available at the MPS website : https://www.monolithicpower.com/en/mp5990.html
Author:
Peter Yin <peteryin.openbmc@gmail.com>
Description
-----------
This driver implements support for Monolithic Power Systems, Inc. (MPS)
MP5990 Hot-Swap Controller.
Device compliant with:
- PMBus rev 1.3 interface.
Device supports direct and linear format for reading input voltage,
output voltage, output current, input power and temperature.
The driver exports the following attributes via the 'sysfs' files
for input voltage:
**in1_input**
**in1_label**
**in1_max**
**in1_max_alarm**
**in1_min**
**in1_min_alarm**
The driver provides the following attributes for output voltage:
**in2_input**
**in2_label**
**in2_alarm**
The driver provides the following attributes for output current:
**curr1_input**
**curr1_label**
**curr1_alarm**
**curr1_max**
The driver provides the following attributes for input power:
**power1_input**
**power1_label**
**power1_alarm**
The driver provides the following attributes for temperature:
**temp1_input**
**temp1_max**
**temp1_max_alarm**
**temp1_crit**
**temp1_crit_alarm**

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@ -333,6 +333,15 @@ config SENSORS_MP5023
This driver can also be built as a module. If so, the module will This driver can also be built as a module. If so, the module will
be called mp5023. be called mp5023.
config SENSORS_MP5990
tristate "MPS MP5990"
help
If you say yes here you get hardware monitoring support for MPS
MP5990.
This driver can also be built as a module. If so, the module will
be called mp5990.
config SENSORS_MPQ7932_REGULATOR config SENSORS_MPQ7932_REGULATOR
bool "Regulator support for MPQ7932" bool "Regulator support for MPQ7932"
depends on SENSORS_MPQ7932 && REGULATOR depends on SENSORS_MPQ7932 && REGULATOR

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@ -35,6 +35,7 @@ obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
obj-$(CONFIG_SENSORS_MP2888) += mp2888.o obj-$(CONFIG_SENSORS_MP2888) += mp2888.o
obj-$(CONFIG_SENSORS_MP2975) += mp2975.o obj-$(CONFIG_SENSORS_MP2975) += mp2975.o
obj-$(CONFIG_SENSORS_MP5023) += mp5023.o obj-$(CONFIG_SENSORS_MP5023) += mp5023.o
obj-$(CONFIG_SENSORS_MP5990) += mp5990.o
obj-$(CONFIG_SENSORS_MPQ7932) += mpq7932.o obj-$(CONFIG_SENSORS_MPQ7932) += mpq7932.o
obj-$(CONFIG_SENSORS_PLI1209BC) += pli1209bc.o obj-$(CONFIG_SENSORS_PLI1209BC) += pli1209bc.o
obj-$(CONFIG_SENSORS_PM6764TR) += pm6764tr.o obj-$(CONFIG_SENSORS_PM6764TR) += pm6764tr.o

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@ -0,0 +1,179 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for MPS MP5990 Hot-Swap Controller
*/
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include "pmbus.h"
#define MP5990_EFUSE_CFG (0xC4)
#define MP5990_VOUT_FORMAT BIT(9)
struct mp5990_data {
struct pmbus_driver_info info;
u8 vout_mode;
u8 vout_linear_exponent;
};
#define to_mp5990_data(x) container_of(x, struct mp5990_data, info)
static int mp5990_read_byte_data(struct i2c_client *client, int page, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
struct mp5990_data *data = to_mp5990_data(info);
switch (reg) {
case PMBUS_VOUT_MODE:
if (data->vout_mode == linear) {
/*
* The VOUT format used by the chip is linear11,
* not linear16. Report that VOUT is in linear mode
* and return exponent value extracted while probing
* the chip.
*/
return data->vout_linear_exponent;
}
/*
* The datasheet does not support the VOUT command,
* but the device responds with a default value of 0x17.
* In the standard, 0x17 represents linear mode.
* Therefore, we should report that VOUT is in direct
* format when the chip is configured for it.
*/
return PB_VOUT_MODE_DIRECT;
default:
return -ENODATA;
}
}
static int mp5990_read_word_data(struct i2c_client *client, int page,
int phase, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
struct mp5990_data *data = to_mp5990_data(info);
int ret;
s32 mantissa;
switch (reg) {
case PMBUS_READ_VOUT:
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
/*
* Because the VOUT format used by the chip is linear11 and not
* linear16, we disregard bits[15:11]. The exponent is reported
* as part of the VOUT_MODE command.
*/
if (data->vout_mode == linear) {
mantissa = ((s16)((ret & 0x7ff) << 5)) >> 5;
ret = mantissa;
}
break;
default:
return -ENODATA;
}
return ret;
}
static struct pmbus_driver_info mp5990_info = {
.pages = 1,
.format[PSC_VOLTAGE_IN] = direct,
.format[PSC_VOLTAGE_OUT] = direct,
.format[PSC_CURRENT_OUT] = direct,
.format[PSC_POWER] = direct,
.format[PSC_TEMPERATURE] = direct,
.m[PSC_VOLTAGE_IN] = 32,
.b[PSC_VOLTAGE_IN] = 0,
.R[PSC_VOLTAGE_IN] = 0,
.m[PSC_VOLTAGE_OUT] = 32,
.b[PSC_VOLTAGE_OUT] = 0,
.R[PSC_VOLTAGE_OUT] = 0,
.m[PSC_CURRENT_OUT] = 16,
.b[PSC_CURRENT_OUT] = 0,
.R[PSC_CURRENT_OUT] = 0,
.m[PSC_POWER] = 1,
.b[PSC_POWER] = 0,
.R[PSC_POWER] = 0,
.m[PSC_TEMPERATURE] = 1,
.b[PSC_TEMPERATURE] = 0,
.R[PSC_TEMPERATURE] = 0,
.func[0] =
PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_PIN |
PMBUS_HAVE_TEMP | PMBUS_HAVE_IOUT |
PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
.read_byte_data = mp5990_read_byte_data,
.read_word_data = mp5990_read_word_data,
};
static int mp5990_probe(struct i2c_client *client)
{
struct pmbus_driver_info *info;
struct mp5990_data *data;
int ret;
data = devm_kzalloc(&client->dev, sizeof(struct mp5990_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;
memcpy(&data->info, &mp5990_info, sizeof(*info));
info = &data->info;
/* Read Vout Config */
ret = i2c_smbus_read_word_data(client, MP5990_EFUSE_CFG);
if (ret < 0) {
dev_err(&client->dev, "Can't get vout mode.");
return ret;
}
/*
* EFUSE_CFG (0xC4) bit9=1 is linear mode, bit=0 is direct mode.
*/
if (ret & MP5990_VOUT_FORMAT) {
data->vout_mode = linear;
data->info.format[PSC_VOLTAGE_IN] = linear;
data->info.format[PSC_VOLTAGE_OUT] = linear;
data->info.format[PSC_CURRENT_OUT] = linear;
data->info.format[PSC_POWER] = linear;
ret = i2c_smbus_read_word_data(client, PMBUS_READ_VOUT);
if (ret < 0) {
dev_err(&client->dev, "Can't get vout exponent.");
return ret;
}
data->vout_linear_exponent = (u8)((ret >> 11) & 0x1f);
} else {
data->vout_mode = direct;
}
return pmbus_do_probe(client, info);
}
static const struct of_device_id mp5990_of_match[] = {
{ .compatible = "mps,mp5990" },
{}
};
static const struct i2c_device_id mp5990_id[] = {
{"mp5990", 0},
{ }
};
MODULE_DEVICE_TABLE(i2c, mp5990_id);
static struct i2c_driver mp5990_driver = {
.driver = {
.name = "mp5990",
.of_match_table = mp5990_of_match,
},
.probe = mp5990_probe,
.id_table = mp5990_id,
};
module_i2c_driver(mp5990_driver);
MODULE_AUTHOR("Peter Yin <peter.yin@quantatw.com>");
MODULE_DESCRIPTION("PMBus driver for MP5990 HSC");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(PMBUS);