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linux/drivers/hwmon/pmbus/lm25066.c
Zev Weiss da78ad2b6b hwmon: (pmbus/lm25066) Add regulator support 
While these chips aren't strictly advertised as voltage regulators per
se, they (aside from the lm25056) support the PMBus OPERATION command
to enable and disable their outputs and have status bits for reporting
various warnings and faults, and can hence usefully support all the
pmbus_regulator_ops operations.

Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Link: https://lore.kernel.org/r/20220219000742.20126-1-zev@bewilderbeest.net
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2022-02-27 17:03:18 -08:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Hardware monitoring driver for LM25056 / LM25066 / LM5064 / LM5066
*
* Copyright (c) 2011 Ericsson AB.
* Copyright (c) 2013 Guenter Roeck
*/
#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/log2.h>
#include <linux/of_device.h>
#include "pmbus.h"
enum chips { lm25056, lm25066, lm5064, lm5066, lm5066i };
#define LM25066_READ_VAUX 0xd0
#define LM25066_MFR_READ_IIN 0xd1
#define LM25066_MFR_READ_PIN 0xd2
#define LM25066_MFR_IIN_OC_WARN_LIMIT 0xd3
#define LM25066_MFR_PIN_OP_WARN_LIMIT 0xd4
#define LM25066_READ_PIN_PEAK 0xd5
#define LM25066_CLEAR_PIN_PEAK 0xd6
#define LM25066_DEVICE_SETUP 0xd9
#define LM25066_READ_AVG_VIN 0xdc
#define LM25066_SAMPLES_FOR_AVG 0xdb
#define LM25066_READ_AVG_VOUT 0xdd
#define LM25066_READ_AVG_IIN 0xde
#define LM25066_READ_AVG_PIN 0xdf
#define LM25066_DEV_SETUP_CL BIT(4) /* Current limit */
#define LM25066_SAMPLES_FOR_AVG_MAX 4096
/* LM25056 only */
#define LM25056_VAUX_OV_WARN_LIMIT 0xe3
#define LM25056_VAUX_UV_WARN_LIMIT 0xe4
#define LM25056_MFR_STS_VAUX_OV_WARN BIT(1)
#define LM25056_MFR_STS_VAUX_UV_WARN BIT(0)
struct __coeff {
short m, b, R;
};
#define PSC_CURRENT_IN_L (PSC_NUM_CLASSES)
#define PSC_POWER_L (PSC_NUM_CLASSES + 1)
static const struct __coeff lm25066_coeff[][PSC_NUM_CLASSES + 2] = {
[lm25056] = {
[PSC_VOLTAGE_IN] = {
.m = 16296,
.b = 1343,
.R = -2,
},
[PSC_CURRENT_IN] = {
.m = 13797,
.b = -1833,
.R = -2,
},
[PSC_CURRENT_IN_L] = {
.m = 6726,
.b = -537,
.R = -2,
},
[PSC_POWER] = {
.m = 5501,
.b = -2908,
.R = -3,
},
[PSC_POWER_L] = {
.m = 26882,
.b = -5646,
.R = -4,
},
[PSC_TEMPERATURE] = {
.m = 1580,
.b = -14500,
.R = -2,
},
},
[lm25066] = {
[PSC_VOLTAGE_IN] = {
.m = 22070,
.b = -1800,
.R = -2,
},
[PSC_VOLTAGE_OUT] = {
.m = 22070,
.b = -1800,
.R = -2,
},
[PSC_CURRENT_IN] = {
.m = 13661,
.b = -5200,
.R = -2,
},
[PSC_CURRENT_IN_L] = {
.m = 6854,
.b = -3100,
.R = -2,
},
[PSC_POWER] = {
.m = 736,
.b = -3300,
.R = -2,
},
[PSC_POWER_L] = {
.m = 369,
.b = -1900,
.R = -2,
},
[PSC_TEMPERATURE] = {
.m = 16,
},
},
[lm5064] = {
[PSC_VOLTAGE_IN] = {
.m = 4611,
.b = -642,
.R = -2,
},
[PSC_VOLTAGE_OUT] = {
.m = 4621,
.b = 423,
.R = -2,
},
[PSC_CURRENT_IN] = {
.m = 10742,
.b = 1552,
.R = -2,
},
[PSC_CURRENT_IN_L] = {
.m = 5456,
.b = 2118,
.R = -2,
},
[PSC_POWER] = {
.m = 1204,
.b = 8524,
.R = -3,
},
[PSC_POWER_L] = {
.m = 612,
.b = 11202,
.R = -3,
},
[PSC_TEMPERATURE] = {
.m = 16,
},
},
[lm5066] = {
[PSC_VOLTAGE_IN] = {
.m = 4587,
.b = -1200,
.R = -2,
},
[PSC_VOLTAGE_OUT] = {
.m = 4587,
.b = -2400,
.R = -2,
},
[PSC_CURRENT_IN] = {
.m = 10753,
.b = -1200,
.R = -2,
},
[PSC_CURRENT_IN_L] = {
.m = 5405,
.b = -600,
.R = -2,
},
[PSC_POWER] = {
.m = 1204,
.b = -6000,
.R = -3,
},
[PSC_POWER_L] = {
.m = 605,
.b = -8000,
.R = -3,
},
[PSC_TEMPERATURE] = {
.m = 16,
},
},
[lm5066i] = {
[PSC_VOLTAGE_IN] = {
.m = 4617,
.b = -140,
.R = -2,
},
[PSC_VOLTAGE_OUT] = {
.m = 4602,
.b = 500,
.R = -2,
},
[PSC_CURRENT_IN] = {
.m = 15076,
.b = -504,
.R = -2,
},
[PSC_CURRENT_IN_L] = {
.m = 7645,
.b = 100,
.R = -2,
},
[PSC_POWER] = {
.m = 1701,
.b = -4000,
.R = -3,
},
[PSC_POWER_L] = {
.m = 861,
.b = -965,
.R = -3,
},
[PSC_TEMPERATURE] = {
.m = 16,
},
},
};
struct lm25066_data {
int id;
u16 rlimit; /* Maximum register value */
struct pmbus_driver_info info;
};
#define to_lm25066_data(x) container_of(x, struct lm25066_data, info)
static int lm25066_read_word_data(struct i2c_client *client, int page,
int phase, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
const struct lm25066_data *data = to_lm25066_data(info);
int ret;
switch (reg) {
case PMBUS_VIRT_READ_VMON:
ret = pmbus_read_word_data(client, 0, 0xff, LM25066_READ_VAUX);
if (ret < 0)
break;
/* Adjust returned value to match VIN coefficients */
switch (data->id) {
case lm25056:
/* VIN: 6.14 mV VAUX: 293 uV LSB */
ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
break;
case lm25066:
/* VIN: 4.54 mV VAUX: 283.2 uV LSB */
ret = DIV_ROUND_CLOSEST(ret * 2832, 45400);
break;
case lm5064:
/* VIN: 4.53 mV VAUX: 700 uV LSB */
ret = DIV_ROUND_CLOSEST(ret * 70, 453);
break;
case lm5066:
case lm5066i:
/* VIN: 2.18 mV VAUX: 725 uV LSB */
ret = DIV_ROUND_CLOSEST(ret * 725, 2180);
break;
}
break;
case PMBUS_READ_IIN:
ret = pmbus_read_word_data(client, 0, 0xff,
LM25066_MFR_READ_IIN);
break;
case PMBUS_READ_PIN:
ret = pmbus_read_word_data(client, 0, 0xff,
LM25066_MFR_READ_PIN);
break;
case PMBUS_IIN_OC_WARN_LIMIT:
ret = pmbus_read_word_data(client, 0, 0xff,
LM25066_MFR_IIN_OC_WARN_LIMIT);
break;
case PMBUS_PIN_OP_WARN_LIMIT:
ret = pmbus_read_word_data(client, 0, 0xff,
LM25066_MFR_PIN_OP_WARN_LIMIT);
break;
case PMBUS_VIRT_READ_VIN_AVG:
ret = pmbus_read_word_data(client, 0, 0xff,
LM25066_READ_AVG_VIN);
break;
case PMBUS_VIRT_READ_VOUT_AVG:
ret = pmbus_read_word_data(client, 0, 0xff,
LM25066_READ_AVG_VOUT);
break;
case PMBUS_VIRT_READ_IIN_AVG:
ret = pmbus_read_word_data(client, 0, 0xff,
LM25066_READ_AVG_IIN);
break;
case PMBUS_VIRT_READ_PIN_AVG:
ret = pmbus_read_word_data(client, 0, 0xff,
LM25066_READ_AVG_PIN);
break;
case PMBUS_VIRT_READ_PIN_MAX:
ret = pmbus_read_word_data(client, 0, 0xff,
LM25066_READ_PIN_PEAK);
break;
case PMBUS_VIRT_RESET_PIN_HISTORY:
ret = 0;
break;
case PMBUS_VIRT_SAMPLES:
ret = pmbus_read_byte_data(client, 0, LM25066_SAMPLES_FOR_AVG);
if (ret < 0)
break;
ret = 1 << ret;
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static int lm25056_read_word_data(struct i2c_client *client, int page,
int phase, int reg)
{
int ret;
switch (reg) {
case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
ret = pmbus_read_word_data(client, 0, 0xff,
LM25056_VAUX_UV_WARN_LIMIT);
if (ret < 0)
break;
/* Adjust returned value to match VIN coefficients */
ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
break;
case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
ret = pmbus_read_word_data(client, 0, 0xff,
LM25056_VAUX_OV_WARN_LIMIT);
if (ret < 0)
break;
/* Adjust returned value to match VIN coefficients */
ret = DIV_ROUND_CLOSEST(ret * 293, 6140);
break;
default:
ret = lm25066_read_word_data(client, page, phase, reg);
break;
}
return ret;
}
static int lm25056_read_byte_data(struct i2c_client *client, int page, int reg)
{
int ret, s;
switch (reg) {
case PMBUS_VIRT_STATUS_VMON:
ret = pmbus_read_byte_data(client, 0,
PMBUS_STATUS_MFR_SPECIFIC);
if (ret < 0)
break;
s = 0;
if (ret & LM25056_MFR_STS_VAUX_UV_WARN)
s |= PB_VOLTAGE_UV_WARNING;
if (ret & LM25056_MFR_STS_VAUX_OV_WARN)
s |= PB_VOLTAGE_OV_WARNING;
ret = s;
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
u16 word)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
const struct lm25066_data *data = to_lm25066_data(info);
int ret;
switch (reg) {
case PMBUS_POUT_OP_FAULT_LIMIT:
case PMBUS_POUT_OP_WARN_LIMIT:
case PMBUS_VOUT_UV_WARN_LIMIT:
case PMBUS_OT_FAULT_LIMIT:
case PMBUS_OT_WARN_LIMIT:
case PMBUS_IIN_OC_FAULT_LIMIT:
case PMBUS_VIN_UV_WARN_LIMIT:
case PMBUS_VIN_UV_FAULT_LIMIT:
case PMBUS_VIN_OV_FAULT_LIMIT:
case PMBUS_VIN_OV_WARN_LIMIT:
word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
ret = pmbus_write_word_data(client, 0, reg, word);
break;
case PMBUS_IIN_OC_WARN_LIMIT:
word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
ret = pmbus_write_word_data(client, 0,
LM25066_MFR_IIN_OC_WARN_LIMIT,
word);
break;
case PMBUS_PIN_OP_WARN_LIMIT:
word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
ret = pmbus_write_word_data(client, 0,
LM25066_MFR_PIN_OP_WARN_LIMIT,
word);
break;
case PMBUS_VIRT_VMON_UV_WARN_LIMIT:
/* Adjust from VIN coefficients (for LM25056) */
word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
ret = pmbus_write_word_data(client, 0,
LM25056_VAUX_UV_WARN_LIMIT, word);
break;
case PMBUS_VIRT_VMON_OV_WARN_LIMIT:
/* Adjust from VIN coefficients (for LM25056) */
word = DIV_ROUND_CLOSEST((int)word * 6140, 293);
word = ((s16)word < 0) ? 0 : clamp_val(word, 0, data->rlimit);
ret = pmbus_write_word_data(client, 0,
LM25056_VAUX_OV_WARN_LIMIT, word);
break;
case PMBUS_VIRT_RESET_PIN_HISTORY:
ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK);
break;
case PMBUS_VIRT_SAMPLES:
word = clamp_val(word, 1, LM25066_SAMPLES_FOR_AVG_MAX);
ret = pmbus_write_byte_data(client, 0, LM25066_SAMPLES_FOR_AVG,
ilog2(word));
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
#if IS_ENABLED(CONFIG_SENSORS_LM25066_REGULATOR)
static const struct regulator_desc lm25066_reg_desc[] = {
PMBUS_REGULATOR("vout", 0),
};
#endif
static const struct i2c_device_id lm25066_id[] = {
{"lm25056", lm25056},
{"lm25066", lm25066},
{"lm5064", lm5064},
{"lm5066", lm5066},
{"lm5066i", lm5066i},
{ }
};
MODULE_DEVICE_TABLE(i2c, lm25066_id);
static const struct of_device_id __maybe_unused lm25066_of_match[] = {
{ .compatible = "ti,lm25056", .data = (void *)lm25056, },
{ .compatible = "ti,lm25066", .data = (void *)lm25066, },
{ .compatible = "ti,lm5064", .data = (void *)lm5064, },
{ .compatible = "ti,lm5066", .data = (void *)lm5066, },
{ .compatible = "ti,lm5066i", .data = (void *)lm5066i, },
{ },
};
MODULE_DEVICE_TABLE(of, lm25066_of_match);
static int lm25066_probe(struct i2c_client *client)
{
int config;
u32 shunt;
struct lm25066_data *data;
struct pmbus_driver_info *info;
const struct __coeff *coeff;
const struct of_device_id *of_id;
const struct i2c_device_id *i2c_id;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_BYTE_DATA))
return -ENODEV;
data = devm_kzalloc(&client->dev, sizeof(struct lm25066_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;
config = i2c_smbus_read_byte_data(client, LM25066_DEVICE_SETUP);
if (config < 0)
return config;
i2c_id = i2c_match_id(lm25066_id, client);
of_id = of_match_device(lm25066_of_match, &client->dev);
if (of_id && (unsigned long)of_id->data != i2c_id->driver_data)
dev_notice(&client->dev, "Device mismatch: %s in device tree, %s detected\n",
of_id->name, i2c_id->name);
data->id = i2c_id->driver_data;
info = &data->info;
info->pages = 1;
info->format[PSC_VOLTAGE_IN] = direct;
info->format[PSC_VOLTAGE_OUT] = direct;
info->format[PSC_CURRENT_IN] = direct;
info->format[PSC_TEMPERATURE] = direct;
info->format[PSC_POWER] = direct;
info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VMON
| PMBUS_HAVE_PIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT
| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_SAMPLES;
if (data->id == lm25056) {
info->func[0] |= PMBUS_HAVE_STATUS_VMON;
info->read_word_data = lm25056_read_word_data;
info->read_byte_data = lm25056_read_byte_data;
data->rlimit = 0x0fff;
} else {
info->func[0] |= PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT;
info->read_word_data = lm25066_read_word_data;
data->rlimit = 0x0fff;
}
info->write_word_data = lm25066_write_word_data;
coeff = &lm25066_coeff[data->id][0];
info->m[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].m;
info->b[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].b;
info->R[PSC_TEMPERATURE] = coeff[PSC_TEMPERATURE].R;
info->m[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].m;
info->b[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].b;
info->R[PSC_VOLTAGE_IN] = coeff[PSC_VOLTAGE_IN].R;
info->m[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].m;
info->b[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].b;
info->R[PSC_VOLTAGE_OUT] = coeff[PSC_VOLTAGE_OUT].R;
info->R[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].R;
info->R[PSC_POWER] = coeff[PSC_POWER].R;
if (config & LM25066_DEV_SETUP_CL) {
info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].m;
info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN_L].b;
info->m[PSC_POWER] = coeff[PSC_POWER_L].m;
info->b[PSC_POWER] = coeff[PSC_POWER_L].b;
} else {
info->m[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].m;
info->b[PSC_CURRENT_IN] = coeff[PSC_CURRENT_IN].b;
info->m[PSC_POWER] = coeff[PSC_POWER].m;
info->b[PSC_POWER] = coeff[PSC_POWER].b;
}
/*
* Values in the TI datasheets are normalized for a 1mOhm sense
* resistor; assume that unless DT specifies a value explicitly.
*/
if (of_property_read_u32(client->dev.of_node, "shunt-resistor-micro-ohms", &shunt))
shunt = 1000;
info->m[PSC_CURRENT_IN] = info->m[PSC_CURRENT_IN] * shunt / 1000;
info->m[PSC_POWER] = info->m[PSC_POWER] * shunt / 1000;
#if IS_ENABLED(CONFIG_SENSORS_LM25066_REGULATOR)
/* LM25056 doesn't support OPERATION */
if (data->id != lm25056) {
info->num_regulators = ARRAY_SIZE(lm25066_reg_desc);
info->reg_desc = lm25066_reg_desc;
}
#endif
return pmbus_do_probe(client, info);
}
/* This is the driver that will be inserted */
static struct i2c_driver lm25066_driver = {
.driver = {
.name = "lm25066",
.of_match_table = of_match_ptr(lm25066_of_match),
},
.probe_new = lm25066_probe,
.id_table = lm25066_id,
};
module_i2c_driver(lm25066_driver);
MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for LM25066 and compatible chips");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(PMBUS);
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