![Samuel Mendoza-Jonas](/assets/img/avatar_default.png)
IR35221 is a Digital DC-DC Multiphase Converter Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com> [groeck: Preserve alphabetic order in Kconfig; add missing break statements (from Dan Carpenter); add missing error checks] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
338 lines
8.3 KiB
C
338 lines
8.3 KiB
C
/*
|
|
* Hardware monitoring driver for IR35221
|
|
*
|
|
* Copyright (C) IBM Corporation 2017.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include "pmbus.h"
|
|
|
|
#define IR35221_MFR_VIN_PEAK 0xc5
|
|
#define IR35221_MFR_VOUT_PEAK 0xc6
|
|
#define IR35221_MFR_IOUT_PEAK 0xc7
|
|
#define IR35221_MFR_TEMP_PEAK 0xc8
|
|
#define IR35221_MFR_VIN_VALLEY 0xc9
|
|
#define IR35221_MFR_VOUT_VALLEY 0xca
|
|
#define IR35221_MFR_IOUT_VALLEY 0xcb
|
|
#define IR35221_MFR_TEMP_VALLEY 0xcc
|
|
|
|
static long ir35221_reg2data(int data, enum pmbus_sensor_classes class)
|
|
{
|
|
s16 exponent;
|
|
s32 mantissa;
|
|
long val;
|
|
|
|
/* We only modify LINEAR11 formats */
|
|
exponent = ((s16)data) >> 11;
|
|
mantissa = ((s16)((data & 0x7ff) << 5)) >> 5;
|
|
|
|
val = mantissa * 1000L;
|
|
|
|
/* scale result to micro-units for power sensors */
|
|
if (class == PSC_POWER)
|
|
val = val * 1000L;
|
|
|
|
if (exponent >= 0)
|
|
val <<= exponent;
|
|
else
|
|
val >>= -exponent;
|
|
|
|
return val;
|
|
}
|
|
|
|
#define MAX_MANTISSA (1023 * 1000)
|
|
#define MIN_MANTISSA (511 * 1000)
|
|
|
|
static u16 ir35221_data2reg(long val, enum pmbus_sensor_classes class)
|
|
{
|
|
s16 exponent = 0, mantissa;
|
|
bool negative = false;
|
|
|
|
if (val == 0)
|
|
return 0;
|
|
|
|
if (val < 0) {
|
|
negative = true;
|
|
val = -val;
|
|
}
|
|
|
|
/* Power is in uW. Convert to mW before converting. */
|
|
if (class == PSC_POWER)
|
|
val = DIV_ROUND_CLOSEST(val, 1000L);
|
|
|
|
/* Reduce large mantissa until it fits into 10 bit */
|
|
while (val >= MAX_MANTISSA && exponent < 15) {
|
|
exponent++;
|
|
val >>= 1;
|
|
}
|
|
/* Increase small mantissa to improve precision */
|
|
while (val < MIN_MANTISSA && exponent > -15) {
|
|
exponent--;
|
|
val <<= 1;
|
|
}
|
|
|
|
/* Convert mantissa from milli-units to units */
|
|
mantissa = DIV_ROUND_CLOSEST(val, 1000);
|
|
|
|
/* Ensure that resulting number is within range */
|
|
if (mantissa > 0x3ff)
|
|
mantissa = 0x3ff;
|
|
|
|
/* restore sign */
|
|
if (negative)
|
|
mantissa = -mantissa;
|
|
|
|
/* Convert to 5 bit exponent, 11 bit mantissa */
|
|
return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
|
|
}
|
|
|
|
static u16 ir35221_scale_result(s16 data, int shift,
|
|
enum pmbus_sensor_classes class)
|
|
{
|
|
long val;
|
|
|
|
val = ir35221_reg2data(data, class);
|
|
|
|
if (shift < 0)
|
|
val >>= -shift;
|
|
else
|
|
val <<= shift;
|
|
|
|
return ir35221_data2reg(val, class);
|
|
}
|
|
|
|
static int ir35221_read_word_data(struct i2c_client *client, int page, int reg)
|
|
{
|
|
int ret;
|
|
|
|
switch (reg) {
|
|
case PMBUS_IOUT_OC_FAULT_LIMIT:
|
|
case PMBUS_IOUT_OC_WARN_LIMIT:
|
|
ret = pmbus_read_word_data(client, page, reg);
|
|
if (ret < 0)
|
|
break;
|
|
ret = ir35221_scale_result(ret, 1, PSC_CURRENT_OUT);
|
|
break;
|
|
case PMBUS_VIN_OV_FAULT_LIMIT:
|
|
case PMBUS_VIN_OV_WARN_LIMIT:
|
|
case PMBUS_VIN_UV_WARN_LIMIT:
|
|
ret = pmbus_read_word_data(client, page, reg);
|
|
ret = ir35221_scale_result(ret, -4, PSC_VOLTAGE_IN);
|
|
break;
|
|
case PMBUS_IIN_OC_WARN_LIMIT:
|
|
ret = pmbus_read_word_data(client, page, reg);
|
|
if (ret < 0)
|
|
break;
|
|
ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN);
|
|
break;
|
|
case PMBUS_READ_VIN:
|
|
ret = pmbus_read_word_data(client, page, PMBUS_READ_VIN);
|
|
if (ret < 0)
|
|
break;
|
|
ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN);
|
|
break;
|
|
case PMBUS_READ_IIN:
|
|
ret = pmbus_read_word_data(client, page, PMBUS_READ_IIN);
|
|
if (ret < 0)
|
|
break;
|
|
if (page == 0)
|
|
ret = ir35221_scale_result(ret, -4, PSC_CURRENT_IN);
|
|
else
|
|
ret = ir35221_scale_result(ret, -5, PSC_CURRENT_IN);
|
|
break;
|
|
case PMBUS_READ_POUT:
|
|
ret = pmbus_read_word_data(client, page, PMBUS_READ_POUT);
|
|
if (ret < 0)
|
|
break;
|
|
ret = ir35221_scale_result(ret, -1, PSC_POWER);
|
|
break;
|
|
case PMBUS_READ_PIN:
|
|
ret = pmbus_read_word_data(client, page, PMBUS_READ_PIN);
|
|
if (ret < 0)
|
|
break;
|
|
ret = ir35221_scale_result(ret, -1, PSC_POWER);
|
|
break;
|
|
case PMBUS_READ_IOUT:
|
|
ret = pmbus_read_word_data(client, page, PMBUS_READ_IOUT);
|
|
if (ret < 0)
|
|
break;
|
|
if (page == 0)
|
|
ret = ir35221_scale_result(ret, -1, PSC_CURRENT_OUT);
|
|
else
|
|
ret = ir35221_scale_result(ret, -2, PSC_CURRENT_OUT);
|
|
break;
|
|
case PMBUS_VIRT_READ_VIN_MAX:
|
|
ret = pmbus_read_word_data(client, page, IR35221_MFR_VIN_PEAK);
|
|
if (ret < 0)
|
|
break;
|
|
ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN);
|
|
break;
|
|
case PMBUS_VIRT_READ_VOUT_MAX:
|
|
ret = pmbus_read_word_data(client, page, IR35221_MFR_VOUT_PEAK);
|
|
break;
|
|
case PMBUS_VIRT_READ_IOUT_MAX:
|
|
ret = pmbus_read_word_data(client, page, IR35221_MFR_IOUT_PEAK);
|
|
if (ret < 0)
|
|
break;
|
|
if (page == 0)
|
|
ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN);
|
|
else
|
|
ret = ir35221_scale_result(ret, -2, PSC_CURRENT_IN);
|
|
break;
|
|
case PMBUS_VIRT_READ_TEMP_MAX:
|
|
ret = pmbus_read_word_data(client, page, IR35221_MFR_TEMP_PEAK);
|
|
break;
|
|
case PMBUS_VIRT_READ_VIN_MIN:
|
|
ret = pmbus_read_word_data(client, page,
|
|
IR35221_MFR_VIN_VALLEY);
|
|
if (ret < 0)
|
|
break;
|
|
ret = ir35221_scale_result(ret, -5, PSC_VOLTAGE_IN);
|
|
break;
|
|
case PMBUS_VIRT_READ_VOUT_MIN:
|
|
ret = pmbus_read_word_data(client, page,
|
|
IR35221_MFR_VOUT_VALLEY);
|
|
break;
|
|
case PMBUS_VIRT_READ_IOUT_MIN:
|
|
ret = pmbus_read_word_data(client, page,
|
|
IR35221_MFR_IOUT_VALLEY);
|
|
if (ret < 0)
|
|
break;
|
|
if (page == 0)
|
|
ret = ir35221_scale_result(ret, -1, PSC_CURRENT_IN);
|
|
else
|
|
ret = ir35221_scale_result(ret, -2, PSC_CURRENT_IN);
|
|
break;
|
|
case PMBUS_VIRT_READ_TEMP_MIN:
|
|
ret = pmbus_read_word_data(client, page,
|
|
IR35221_MFR_TEMP_VALLEY);
|
|
break;
|
|
default:
|
|
ret = -ENODATA;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ir35221_write_word_data(struct i2c_client *client, int page, int reg,
|
|
u16 word)
|
|
{
|
|
int ret;
|
|
u16 val;
|
|
|
|
switch (reg) {
|
|
case PMBUS_IOUT_OC_FAULT_LIMIT:
|
|
case PMBUS_IOUT_OC_WARN_LIMIT:
|
|
val = ir35221_scale_result(word, -1, PSC_CURRENT_OUT);
|
|
ret = pmbus_write_word_data(client, page, reg, val);
|
|
break;
|
|
case PMBUS_VIN_OV_FAULT_LIMIT:
|
|
case PMBUS_VIN_OV_WARN_LIMIT:
|
|
case PMBUS_VIN_UV_WARN_LIMIT:
|
|
val = ir35221_scale_result(word, 4, PSC_VOLTAGE_IN);
|
|
ret = pmbus_write_word_data(client, page, reg, val);
|
|
break;
|
|
case PMBUS_IIN_OC_WARN_LIMIT:
|
|
val = ir35221_scale_result(word, 1, PSC_CURRENT_IN);
|
|
ret = pmbus_write_word_data(client, page, reg, val);
|
|
break;
|
|
default:
|
|
ret = -ENODATA;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ir35221_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct pmbus_driver_info *info;
|
|
u8 buf[I2C_SMBUS_BLOCK_MAX];
|
|
int ret;
|
|
|
|
if (!i2c_check_functionality(client->adapter,
|
|
I2C_FUNC_SMBUS_READ_BYTE_DATA
|
|
| I2C_FUNC_SMBUS_READ_WORD_DATA
|
|
| I2C_FUNC_SMBUS_READ_BLOCK_DATA))
|
|
return -ENODEV;
|
|
|
|
ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "Failed to read PMBUS_MFR_ID\n");
|
|
return ret;
|
|
}
|
|
if (ret != 2 || strncmp(buf, "RI", strlen("RI"))) {
|
|
dev_err(&client->dev, "MFR_ID unrecognised\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "Failed to read PMBUS_MFR_MODEL\n");
|
|
return ret;
|
|
}
|
|
if (ret != 2 || !(buf[0] == 0x6c && buf[1] == 0x00)) {
|
|
dev_err(&client->dev, "MFR_MODEL unrecognised\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
info = devm_kzalloc(&client->dev, sizeof(struct pmbus_driver_info),
|
|
GFP_KERNEL);
|
|
if (!info)
|
|
return -ENOMEM;
|
|
|
|
info->write_word_data = ir35221_write_word_data;
|
|
info->read_word_data = ir35221_read_word_data;
|
|
|
|
info->pages = 2;
|
|
info->format[PSC_VOLTAGE_IN] = linear;
|
|
info->format[PSC_VOLTAGE_OUT] = linear;
|
|
info->format[PSC_CURRENT_IN] = linear;
|
|
info->format[PSC_CURRENT_OUT] = linear;
|
|
info->format[PSC_POWER] = linear;
|
|
info->format[PSC_TEMPERATURE] = linear;
|
|
|
|
info->func[0] = PMBUS_HAVE_VIN
|
|
| PMBUS_HAVE_VOUT | PMBUS_HAVE_IIN
|
|
| PMBUS_HAVE_IOUT | PMBUS_HAVE_PIN
|
|
| PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
|
|
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT
|
|
| PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP;
|
|
info->func[1] = info->func[0];
|
|
|
|
return pmbus_do_probe(client, id, info);
|
|
}
|
|
|
|
static const struct i2c_device_id ir35221_id[] = {
|
|
{"ir35221", 0},
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, ir35221_id);
|
|
|
|
static struct i2c_driver ir35221_driver = {
|
|
.driver = {
|
|
.name = "ir35221",
|
|
},
|
|
.probe = ir35221_probe,
|
|
.remove = pmbus_do_remove,
|
|
.id_table = ir35221_id,
|
|
};
|
|
|
|
module_i2c_driver(ir35221_driver);
|
|
|
|
MODULE_AUTHOR("Samuel Mendoza-Jonas <sam@mendozajonas.com");
|
|
MODULE_DESCRIPTION("PMBus driver for IR35221");
|
|
MODULE_LICENSE("GPL");
|