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// 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"},
{ }
};
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);
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