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// SPDX-License-Identifier: GPL-2.0+
/*
* Hardware monitoring driver for Vicor PLI1209BC Digital Supervisor
*
* Copyright (c) 2022 9elements GmbH
*/
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/pmbus.h>
#include <linux/regulator/driver.h>
#include "pmbus.h"
/*
* The capability command is only supported at page 0. Probing the device while
* the page register is set to 1 will falsely enable PEC support. Disable
* capability probing accordingly, since the PLI1209BC does not have any
* additional capabilities.
*/
static struct pmbus_platform_data pli1209bc_plat_data = {
.flags = PMBUS_NO_CAPABILITY,
};
static int pli1209bc_read_word_data(struct i2c_client *client, int page,
int phase, int reg)
{
int data;
switch (reg) {
/* PMBUS_READ_POUT uses a direct format with R=0 */
case PMBUS_READ_POUT:
data = pmbus_read_word_data(client, page, phase, reg);
if (data < 0)
return data;
data = sign_extend32(data, 15) * 10;
return clamp_val(data, -32768, 32767) & 0xffff;
/*
* PMBUS_READ_VOUT and PMBUS_READ_TEMPERATURE_1 return invalid data
* when the BCM is turned off. Since it is not possible to return
* ENODATA error, return zero instead.
*/
case PMBUS_READ_VOUT:
case PMBUS_READ_TEMPERATURE_1:
data = pmbus_read_word_data(client, page, phase,
PMBUS_STATUS_WORD);
if (data < 0)
return data;
if (data & PB_STATUS_POWER_GOOD_N)
return 0;
return pmbus_read_word_data(client, page, phase, reg);
default:
return -ENODATA;
}
}
static int pli1209bc_write_byte(struct i2c_client *client, int page, u8 reg)
{
int ret;
switch (reg) {
case PMBUS_CLEAR_FAULTS:
ret = pmbus_write_byte(client, page, reg);
/*
* PLI1209 takes 230 usec to execute the CLEAR_FAULTS command.
* During that time it's busy and NACKs all requests on the
* SMBUS interface. It also NACKs reads on PMBUS_STATUS_BYTE
* making it impossible to poll the BUSY flag.
*
* Just wait for not BUSY unconditionally.
*/
usleep_range(250, 300);
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
#if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR)
static const struct regulator_desc pli1209bc_reg_desc = {
.name = "vout2",
.id = 1,
.of_match = of_match_ptr("vout2"),
.regulators_node = of_match_ptr("regulators"),
.ops = &pmbus_regulator_ops,
.type = REGULATOR_VOLTAGE,
.owner = THIS_MODULE,
};
#endif
static struct pmbus_driver_info pli1209bc_info = {
.pages = 2,
.format[PSC_VOLTAGE_IN] = direct,
.format[PSC_VOLTAGE_OUT] = direct,
.format[PSC_CURRENT_IN] = direct,
.format[PSC_CURRENT_OUT] = direct,
.format[PSC_POWER] = direct,
.format[PSC_TEMPERATURE] = direct,
.m[PSC_VOLTAGE_IN] = 1,
.b[PSC_VOLTAGE_IN] = 0,
.R[PSC_VOLTAGE_IN] = 1,
.m[PSC_VOLTAGE_OUT] = 1,
.b[PSC_VOLTAGE_OUT] = 0,
.R[PSC_VOLTAGE_OUT] = 1,
.m[PSC_CURRENT_IN] = 1,
.b[PSC_CURRENT_IN] = 0,
.R[PSC_CURRENT_IN] = 3,
.m[PSC_CURRENT_OUT] = 1,
.b[PSC_CURRENT_OUT] = 0,
.R[PSC_CURRENT_OUT] = 2,
.m[PSC_POWER] = 1,
.b[PSC_POWER] = 0,
.R[PSC_POWER] = 1,
.m[PSC_TEMPERATURE] = 1,
.b[PSC_TEMPERATURE] = 0,
.R[PSC_TEMPERATURE] = 0,
/*
* Page 0 sums up all attributes except voltage readings.
* The pli1209 digital supervisor only contains a single BCM, making
* page 0 redundant.
*/
.func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT
| PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT
| PMBUS_HAVE_PIN | PMBUS_HAVE_POUT
| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
| PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT,
.read_word_data = pli1209bc_read_word_data,
.write_byte = pli1209bc_write_byte,
#if IS_ENABLED(CONFIG_SENSORS_PLI1209BC_REGULATOR)
.num_regulators = 1,
.reg_desc = &pli1209bc_reg_desc,
#endif
};
static int pli1209bc_probe(struct i2c_client *client)
{
client->dev.platform_data = &pli1209bc_plat_data;
return pmbus_do_probe(client, &pli1209bc_info);
}
static const struct i2c_device_id pli1209bc_id[] = {
{"pli1209bc", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, pli1209bc_id);
#ifdef CONFIG_OF
static const struct of_device_id pli1209bc_of_match[] = {
{ .compatible = "vicor,pli1209bc" },
{ },
};
MODULE_DEVICE_TABLE(of, pli1209bc_of_match);
#endif
static struct i2c_driver pli1209bc_driver = {
.driver = {
.name = "pli1209bc",
.of_match_table = of_match_ptr(pli1209bc_of_match),
},
.probe = pli1209bc_probe,
.id_table = pli1209bc_id,
};
module_i2c_driver(pli1209bc_driver);
MODULE_AUTHOR("Marcello Sylvester Bauer <sylv@sylv.io>");
MODULE_DESCRIPTION("PMBus driver for Vicor PLI1209BC");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(PMBUS);
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