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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 "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 struct __coeff lm25066_coeff[6][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 const struct i2c_device_id lm25066_id[];
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;
}
static int lm25066_probe(struct i2c_client *client)
{
int config;
struct lm25066_data *data;
struct pmbus_driver_info *info;
struct __coeff *coeff;
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;
data->id = i2c_match_id(lm25066_id, client)->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;
}
return pmbus_do_probe(client, info);
}
static const struct i2c_device_id lm25066_id[] = {
{"lm25056", lm25056},
{"lm25066", lm25066},
{"lm5064", lm5064},
{"lm5066", lm5066},
{"lm5066i", lm5066i},
{ }
};
MODULE_DEVICE_TABLE(i2c, lm25066_id);
/* This is the driver that will be inserted */
static struct i2c_driver lm25066_driver = {
.driver = {
.name = "lm25066",
},
.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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