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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Hardware monitoring driver for MPS Multi-phase Digital VR Controllers(MP2993)
*/
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include "pmbus.h"
#define MP2993_VOUT_OVUV_UINT 125
#define MP2993_VOUT_OVUV_DIV 64
#define MP2993_VIN_LIMIT_UINT 1
#define MP2993_VIN_LIMIT_DIV 8
#define MP2993_READ_VIN_UINT 1
#define MP2993_READ_VIN_DIV 32
#define MP2993_PAGE_NUM 2
#define MP2993_RAIL1_FUNC (PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | \
PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT | \
PMBUS_HAVE_TEMP | PMBUS_HAVE_PIN | \
PMBUS_HAVE_IIN | \
PMBUS_HAVE_STATUS_VOUT | \
PMBUS_HAVE_STATUS_IOUT | \
PMBUS_HAVE_STATUS_TEMP | \
PMBUS_HAVE_STATUS_INPUT)
#define MP2993_RAIL2_FUNC (PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | \
PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP | \
PMBUS_HAVE_STATUS_VOUT | \
PMBUS_HAVE_STATUS_IOUT | \
PMBUS_HAVE_STATUS_TEMP | \
PMBUS_HAVE_STATUS_INPUT)
/* Converts a linear11 data exponent to a specified value */
static u16 mp2993_linear11_exponent_transfer(u16 word, u16 expect_exponent)
{
s16 exponent, mantissa, target_exponent;
exponent = ((s16)word) >> 11;
mantissa = ((s16)((word & 0x7ff) << 5)) >> 5;
target_exponent = (s16)((expect_exponent & 0x1f) << 11) >> 11;
if (exponent > target_exponent)
mantissa = mantissa << (exponent - target_exponent);
else
mantissa = mantissa >> (target_exponent - exponent);
return (mantissa & 0x7ff) | ((expect_exponent << 11) & 0xf800);
}
static int
mp2993_set_vout_format(struct i2c_client *client, int page, int format)
{
int ret;
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
if (ret < 0)
return ret;
return i2c_smbus_write_byte_data(client, PMBUS_VOUT_MODE, format);
}
static int mp2993_identify(struct i2c_client *client, struct pmbus_driver_info *info)
{
int ret;
/* Set vout to direct format for rail1. */
ret = mp2993_set_vout_format(client, 0, PB_VOUT_MODE_DIRECT);
if (ret < 0)
return ret;
/* Set vout to direct format for rail2. */
return mp2993_set_vout_format(client, 1, PB_VOUT_MODE_DIRECT);
}
static int mp2993_read_word_data(struct i2c_client *client, int page, int phase,
int reg)
{
int ret;
switch (reg) {
case PMBUS_VOUT_OV_FAULT_LIMIT:
case PMBUS_VOUT_UV_FAULT_LIMIT:
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = DIV_ROUND_CLOSEST(ret * MP2993_VOUT_OVUV_UINT, MP2993_VOUT_OVUV_DIV);
break;
case PMBUS_OT_FAULT_LIMIT:
case PMBUS_OT_WARN_LIMIT:
/*
* The MP2993 ot fault limit value and ot warn limit value
* per rail are always the same, so only PMBUS_OT_FAULT_LIMIT
* and PMBUS_OT_WARN_LIMIT register in page 0 are defined to
* indicates the limit value.
*/
ret = pmbus_read_word_data(client, 0, phase, reg);
break;
case PMBUS_READ_VIN:
/* The MP2993 vin scale is (1/32V)/Lsb */
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = DIV_ROUND_CLOSEST((ret & GENMASK(9, 0)) * MP2993_READ_VIN_UINT,
MP2993_READ_VIN_DIV);
break;
case PMBUS_VIN_OV_FAULT_LIMIT:
case PMBUS_VIN_OV_WARN_LIMIT:
case PMBUS_VIN_UV_WARN_LIMIT:
case PMBUS_VIN_UV_FAULT_LIMIT:
/* The MP2993 vin limit scale is (1/8V)/Lsb */
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = DIV_ROUND_CLOSEST((ret & GENMASK(7, 0)) * MP2993_VIN_LIMIT_UINT,
MP2993_VIN_LIMIT_DIV);
break;
case PMBUS_READ_IOUT:
case PMBUS_READ_IIN:
case PMBUS_IIN_OC_WARN_LIMIT:
case PMBUS_IOUT_OC_FAULT_LIMIT:
case PMBUS_IOUT_OC_WARN_LIMIT:
case PMBUS_READ_VOUT:
case PMBUS_READ_PIN:
case PMBUS_READ_POUT:
case PMBUS_READ_TEMPERATURE_1:
ret = -ENODATA;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int mp2993_write_word_data(struct i2c_client *client, int page, int reg,
u16 word)
{
int ret;
switch (reg) {
case PMBUS_VOUT_OV_FAULT_LIMIT:
case PMBUS_VOUT_UV_FAULT_LIMIT:
ret = DIV_ROUND_CLOSEST(word * MP2993_VOUT_OVUV_DIV, MP2993_VOUT_OVUV_UINT);
ret = pmbus_write_word_data(client, 0, reg, ret);
break;
case PMBUS_OT_FAULT_LIMIT:
case PMBUS_OT_WARN_LIMIT:
/*
* The MP2993 ot fault limit value and ot warn limit value
* per rail are always the same, so only PMBUS_OT_FAULT_LIMIT
* and PMBUS_OT_WARN_LIMIT register in page 0 are defined to
* config the ot limit value.
*/
ret = pmbus_write_word_data(client, 0, reg, word);
break;
case PMBUS_VIN_OV_FAULT_LIMIT:
case PMBUS_VIN_OV_WARN_LIMIT:
case PMBUS_VIN_UV_WARN_LIMIT:
case PMBUS_VIN_UV_FAULT_LIMIT:
/* The MP2993 vin limit scale is (1/8V)/Lsb */
ret = pmbus_write_word_data(client, 0, reg,
DIV_ROUND_CLOSEST(word * MP2993_VIN_LIMIT_DIV,
MP2993_VIN_LIMIT_UINT));
break;
case PMBUS_IIN_OC_WARN_LIMIT:
/*
* The PMBUS_IIN_OC_WARN_LIMIT of MP2993 is linear11 format,
* and the exponent is a constant value(5'b00000)， so the
* exponent of word parameter should be converted to 5'b00000.
*/
ret = pmbus_write_word_data(client, page, reg,
mp2993_linear11_exponent_transfer(word, 0x00));
break;
//
case PMBUS_IOUT_OC_FAULT_LIMIT:
case PMBUS_IOUT_OC_WARN_LIMIT:
/*
* The PMBUS_IOUT_OC_FAULT_LIMIT and PMBUS_IOUT_OC_WARN_LIMIT
* of MP2993 can be regarded as linear11 format, and the
* exponent is a 5'b00001 or 5'b00000. To ensure a larger
* range of limit value, so the exponent of word parameter
* should be converted to 5'b00001.
*/
ret = pmbus_write_word_data(client, page, reg,
mp2993_linear11_exponent_transfer(word, 0x01));
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static struct pmbus_driver_info mp2993_info = {
.pages = MP2993_PAGE_NUM,
.format[PSC_VOLTAGE_IN] = direct,
.format[PSC_CURRENT_IN] = linear,
.format[PSC_CURRENT_OUT] = linear,
.format[PSC_TEMPERATURE] = direct,
.format[PSC_POWER] = linear,
.format[PSC_VOLTAGE_OUT] = direct,
.m[PSC_VOLTAGE_OUT] = 1,
.R[PSC_VOLTAGE_OUT] = 3,
.b[PSC_VOLTAGE_OUT] = 0,
.m[PSC_VOLTAGE_IN] = 1,
.R[PSC_VOLTAGE_IN] = 0,
.b[PSC_VOLTAGE_IN] = 0,
.m[PSC_TEMPERATURE] = 1,
.R[PSC_TEMPERATURE] = 0,
.b[PSC_TEMPERATURE] = 0,
.func[0] = MP2993_RAIL1_FUNC,
.func[1] = MP2993_RAIL2_FUNC,
.read_word_data = mp2993_read_word_data,
.write_word_data = mp2993_write_word_data,
.identify = mp2993_identify,
};
static int mp2993_probe(struct i2c_client *client)
{
return pmbus_do_probe(client, &mp2993_info);
}
static const struct i2c_device_id mp2993_id[] = {
{ "mp2993" },
{ }
};
MODULE_DEVICE_TABLE(i2c, mp2993_id);
static const struct of_device_id __maybe_unused mp2993_of_match[] = {
{.compatible = "mps,mp2993"},
{}
};
MODULE_DEVICE_TABLE(of, mp2993_of_match);
static struct i2c_driver mp2993_driver = {
.driver = {
.name = "mp2993",
.of_match_table = mp2993_of_match,
},
.probe = mp2993_probe,
.id_table = mp2993_id,
};
module_i2c_driver(mp2993_driver);
MODULE_AUTHOR("Noah Wang <noahwang.wang@outlook.com>");
MODULE_DESCRIPTION("PMBus driver for MPS MP2993");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(PMBUS);
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