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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Hardware monitoring driver for BluTek BPA-RS600 Power Supplies
*
* Copyright 2021 Allied Telesis Labs
*/
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pmbus.h>
#include "pmbus.h"
enum chips { bpa_rs600, bpd_rs600 };
static int bpa_rs600_read_byte_data(struct i2c_client *client, int page, int reg)
{
int ret;
if (page > 0)
return -ENXIO;
switch (reg) {
case PMBUS_FAN_CONFIG_12:
/*
* Two fans are reported in PMBUS_FAN_CONFIG_12 but there is
* only one fan in the module. Mask out the FAN2 bits.
*/
ret = pmbus_read_byte_data(client, 0, PMBUS_FAN_CONFIG_12);
if (ret >= 0)
ret &= ~(PB_FAN_2_INSTALLED | PB_FAN_2_PULSE_MASK);
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
/*
* The BPA-RS600 violates the PMBus spec. Specifically it treats the
* mantissa as unsigned. Deal with this here to allow the PMBus core
* to work with correctly encoded data.
*/
static int bpa_rs600_read_vin(struct i2c_client *client)
{
int ret, exponent, mantissa;
ret = pmbus_read_word_data(client, 0, 0xff, PMBUS_READ_VIN);
if (ret < 0)
return ret;
if (ret & BIT(10)) {
exponent = ret >> 11;
mantissa = ret & 0x7ff;
exponent++;
mantissa >>= 1;
ret = (exponent << 11) | mantissa;
}
return ret;
}
/*
* Firmware V5.70 incorrectly reports 1640W for MFR_PIN_MAX.
* Deal with this by returning a sensible value.
*/
static int bpa_rs600_read_pin_max(struct i2c_client *client)
{
int ret;
ret = pmbus_read_word_data(client, 0, 0xff, PMBUS_MFR_PIN_MAX);
if (ret < 0)
return ret;
/* Detect invalid 1640W (linear encoding) */
if (ret == 0x0b34)
/* Report 700W (linear encoding) */
return 0x095e;
return ret;
}
static int bpa_rs600_read_word_data(struct i2c_client *client, int page, int phase, int reg)
{
int ret;
if (page > 0)
return -ENXIO;
switch (reg) {
case PMBUS_VIN_UV_WARN_LIMIT:
case PMBUS_VIN_OV_WARN_LIMIT:
case PMBUS_VOUT_UV_WARN_LIMIT:
case PMBUS_VOUT_OV_WARN_LIMIT:
case PMBUS_IIN_OC_WARN_LIMIT:
case PMBUS_IOUT_OC_WARN_LIMIT:
case PMBUS_PIN_OP_WARN_LIMIT:
case PMBUS_POUT_OP_WARN_LIMIT:
case PMBUS_VIN_UV_FAULT_LIMIT:
case PMBUS_VIN_OV_FAULT_LIMIT:
case PMBUS_VOUT_UV_FAULT_LIMIT:
case PMBUS_VOUT_OV_FAULT_LIMIT:
/* These commands return data but it is invalid/un-documented */
ret = -ENXIO;
break;
case PMBUS_READ_VIN:
ret = bpa_rs600_read_vin(client);
break;
case PMBUS_MFR_PIN_MAX:
ret = bpa_rs600_read_pin_max(client);
break;
default:
if (reg >= PMBUS_VIRT_BASE)
ret = -ENXIO;
else
ret = -ENODATA;
break;
}
return ret;
}
static struct pmbus_driver_info bpa_rs600_info = {
.pages = 1,
.format[PSC_VOLTAGE_IN] = linear,
.format[PSC_VOLTAGE_OUT] = linear,
.format[PSC_CURRENT_IN] = linear,
.format[PSC_CURRENT_OUT] = linear,
.format[PSC_POWER] = linear,
.format[PSC_TEMPERATURE] = linear,
.format[PSC_FAN] = linear,
.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_TEMP2 |
PMBUS_HAVE_FAN12 |
PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_IOUT |
PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP |
PMBUS_HAVE_STATUS_FAN12,
.read_byte_data = bpa_rs600_read_byte_data,
.read_word_data = bpa_rs600_read_word_data,
};
static const struct i2c_device_id bpa_rs600_id[] = {
{ "bpa-rs600", bpa_rs600 },
{ "bpd-rs600", bpd_rs600 },
{},
};
MODULE_DEVICE_TABLE(i2c, bpa_rs600_id);
static int bpa_rs600_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
u8 buf[I2C_SMBUS_BLOCK_MAX + 1];
int ret;
const struct i2c_device_id *mid;
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_MODEL, buf);
if (ret < 0) {
dev_err(dev, "Failed to read Manufacturer Model\n");
return ret;
}
for (mid = bpa_rs600_id; mid->name[0]; mid++) {
if (!strncasecmp(buf, mid->name, strlen(mid->name)))
break;
}
if (!mid->name[0]) {
buf[ret] = '\0';
dev_err(dev, "Unsupported Manufacturer Model '%s'\n", buf);
return -ENODEV;
}
return pmbus_do_probe(client, &bpa_rs600_info);
}
static const struct of_device_id __maybe_unused bpa_rs600_of_match[] = {
{ .compatible = "blutek,bpa-rs600" },
{},
};
MODULE_DEVICE_TABLE(of, bpa_rs600_of_match);
static struct i2c_driver bpa_rs600_driver = {
.driver = {
.name = "bpa-rs600",
.of_match_table = of_match_ptr(bpa_rs600_of_match),
},
.probe_new = bpa_rs600_probe,
.id_table = bpa_rs600_id,
};
module_i2c_driver(bpa_rs600_driver);
MODULE_AUTHOR("Chris Packham");
MODULE_DESCRIPTION("PMBus driver for BluTek BPA-RS600");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(PMBUS);
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