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// SPDX-License-Identifier: GPL-2.0
/*
* Delta AHE-50DC power shelf fan control module driver
*
* Copyright 2021 Zev Weiss <zev@bewilderbeest.net>
*/
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pmbus.h>
#include "pmbus.h"
#define AHE50DC_PMBUS_READ_TEMP4 0xd0
static int ahe50dc_fan_write_byte(struct i2c_client *client, int page, u8 value)
{
/*
* The CLEAR_FAULTS operation seems to sometimes (unpredictably, perhaps
* 5% of the time or so) trigger a problematic phenomenon in which the
* fan speeds surge momentarily and at least some (perhaps all?) of the
* system's power outputs experience a glitch.
*
* However, according to Delta it should be OK to simply not send any
* CLEAR_FAULTS commands (the device doesn't seem to be capable of
* reporting any faults anyway), so just blackhole them unconditionally.
*/
return value == PMBUS_CLEAR_FAULTS ? -EOPNOTSUPP : -ENODATA;
}
static int ahe50dc_fan_read_word_data(struct i2c_client *client, int page, int phase, int reg)
{
/* temp1 in (virtual) page 1 is remapped to mfr-specific temp4 */
if (page == 1) {
if (reg == PMBUS_READ_TEMPERATURE_1)
return i2c_smbus_read_word_data(client, AHE50DC_PMBUS_READ_TEMP4);
return -EOPNOTSUPP;
}
/*
* There's a fairly limited set of commands this device actually
* supports, so here we block attempts to read anything else (which
* return 0xffff and would cause confusion elsewhere).
*/
switch (reg) {
case PMBUS_STATUS_WORD:
case PMBUS_FAN_COMMAND_1:
case PMBUS_FAN_COMMAND_2:
case PMBUS_FAN_COMMAND_3:
case PMBUS_FAN_COMMAND_4:
case PMBUS_STATUS_FAN_12:
case PMBUS_STATUS_FAN_34:
case PMBUS_READ_VIN:
case PMBUS_READ_TEMPERATURE_1:
case PMBUS_READ_TEMPERATURE_2:
case PMBUS_READ_TEMPERATURE_3:
case PMBUS_READ_FAN_SPEED_1:
case PMBUS_READ_FAN_SPEED_2:
case PMBUS_READ_FAN_SPEED_3:
case PMBUS_READ_FAN_SPEED_4:
return -ENODATA;
default:
return -EOPNOTSUPP;
}
}
static struct pmbus_driver_info ahe50dc_fan_info = {
.pages = 2,
.format[PSC_FAN] = direct,
.format[PSC_TEMPERATURE] = direct,
.format[PSC_VOLTAGE_IN] = direct,
.m[PSC_FAN] = 1,
.b[PSC_FAN] = 0,
.R[PSC_FAN] = 0,
.m[PSC_TEMPERATURE] = 1,
.b[PSC_TEMPERATURE] = 0,
.R[PSC_TEMPERATURE] = 1,
.m[PSC_VOLTAGE_IN] = 1,
.b[PSC_VOLTAGE_IN] = 0,
.R[PSC_VOLTAGE_IN] = 3,
.func[0] = PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 | PMBUS_HAVE_TEMP3 |
PMBUS_HAVE_VIN | PMBUS_HAVE_FAN12 | PMBUS_HAVE_FAN34 |
PMBUS_HAVE_STATUS_FAN12 | PMBUS_HAVE_STATUS_FAN34 | PMBUS_PAGE_VIRTUAL,
.func[1] = PMBUS_HAVE_TEMP | PMBUS_PAGE_VIRTUAL,
.write_byte = ahe50dc_fan_write_byte,
.read_word_data = ahe50dc_fan_read_word_data,
};
/*
* CAPABILITY returns 0xff, which appears to be this device's way indicating
* it doesn't support something (and if we enable I2C_CLIENT_PEC on seeing bit
* 7 being set it generates bad PECs, so let's not go there).
*/
static struct pmbus_platform_data ahe50dc_fan_data = {
.flags = PMBUS_NO_CAPABILITY,
};
static int ahe50dc_fan_probe(struct i2c_client *client)
{
client->dev.platform_data = &ahe50dc_fan_data;
return pmbus_do_probe(client, &ahe50dc_fan_info);
}
static const struct i2c_device_id ahe50dc_fan_id[] = {
{ "ahe50dc_fan" },
{ }
};
MODULE_DEVICE_TABLE(i2c, ahe50dc_fan_id);
static const struct of_device_id __maybe_unused ahe50dc_fan_of_match[] = {
{ .compatible = "delta,ahe50dc-fan" },
{ }
};
MODULE_DEVICE_TABLE(of, ahe50dc_fan_of_match);
static struct i2c_driver ahe50dc_fan_driver = {
.driver = {
.name = "ahe50dc_fan",
.of_match_table = of_match_ptr(ahe50dc_fan_of_match),
},
.probe_new = ahe50dc_fan_probe,
.id_table = ahe50dc_fan_id,
};
module_i2c_driver(ahe50dc_fan_driver);
MODULE_AUTHOR("Zev Weiss <zev@bewilderbeest.net>");
MODULE_DESCRIPTION("Driver for Delta AHE-50DC power shelf fan control module");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(PMBUS);
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