On Mon, Dec 06, 2021 at 11:15:20PM -0800, Zev Weiss wrote: > This device is an integrated module of the Delta AHE-50DC Open19 power > shelf. For lack of proper documentation, this driver has been developed > referencing an existing (GPL) driver that was included in a code release > from LinkedIn [1]. It provides four fan speeds, four temperatures, and > one voltage reading, as well as a handful of warning and fault > indicators. > > [1] https://github.com/linkedin/o19-bmc-firmware/blob/master/meta-openbmc/meta-linkedin/meta-deltapower/recipes-kernel/fancontrol-mod/files/fancontrol.c > Hmm, that reference isn't really accurate anymore. I think it would be better to just say that the device was found to be PMBus compliant. > Signed-off-by: Zev Weiss <zev@xxxxxxxxxxxxxxxxx> > --- > MAINTAINERS | 6 ++ > drivers/hwmon/pmbus/Kconfig | 12 ++++ > drivers/hwmon/pmbus/Makefile | 1 + > drivers/hwmon/pmbus/delta-ahe50dc-fan.c | 84 +++++++++++++++++++++++++ > 4 files changed, 103 insertions(+) > create mode 100644 drivers/hwmon/pmbus/delta-ahe50dc-fan.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index 0ac052200ecb..8bb7ba52d2f5 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -5425,6 +5425,12 @@ W: https://linuxtv.org > T: git git://linuxtv.org/media_tree.git > F: drivers/media/platform/sti/delta > > +DELTA AHE-50DC FAN CONTROL MODULE DRIVER > +M: Zev Weiss <zev@xxxxxxxxxxxxxxxxx> > +L: linux-hwmon@xxxxxxxxxxxxxxx > +S: Maintained > +F: drivers/hwmon/pmbus/delta-ahe50dc-fan.c > + > DELTA DPS920AB PSU DRIVER > M: Robert Marko <robert.marko@xxxxxxxxxx> > L: linux-hwmon@xxxxxxxxxxxxxxx > diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig > index ffb609cee3a4..937e1c2c11e7 100644 > --- a/drivers/hwmon/pmbus/Kconfig > +++ b/drivers/hwmon/pmbus/Kconfig > @@ -66,6 +66,18 @@ config SENSORS_BPA_RS600 > This driver can also be built as a module. If so, the module will > be called bpa-rs600. > > +config SENSORS_DELTA_AHE50DC_FAN > + tristate "Delta AHE-50DC fan control module" > + depends on I2C > + select REGMAP_I2C > + help > + If you say yes here you get hardware monitoring support for > + the integrated fan control module of the Delta AHE-50DC > + Open19 power shelf. > + > + This driver can also be built as a module. If so, the module > + will be called delta-ahe50dc-fan. > + > config SENSORS_FSP_3Y > tristate "FSP/3Y-Power power supplies" > help > diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile > index 0ed4d596a948..a56b2897288d 100644 > --- a/drivers/hwmon/pmbus/Makefile > +++ b/drivers/hwmon/pmbus/Makefile > @@ -9,6 +9,7 @@ obj-$(CONFIG_SENSORS_ADM1266) += adm1266.o > obj-$(CONFIG_SENSORS_ADM1275) += adm1275.o > obj-$(CONFIG_SENSORS_BEL_PFE) += bel-pfe.o > obj-$(CONFIG_SENSORS_BPA_RS600) += bpa-rs600.o > +obj-$(CONFIG_SENSORS_DELTA_AHE50DC_FAN) += delta-ahe50dc-fan.o > obj-$(CONFIG_SENSORS_FSP_3Y) += fsp-3y.o > obj-$(CONFIG_SENSORS_IBM_CFFPS) += ibm-cffps.o > obj-$(CONFIG_SENSORS_DPS920AB) += dps920ab.o > diff --git a/drivers/hwmon/pmbus/delta-ahe50dc-fan.c b/drivers/hwmon/pmbus/delta-ahe50dc-fan.c > new file mode 100644 > index 000000000000..07b1e7c5f5f5 > --- /dev/null > +++ b/drivers/hwmon/pmbus/delta-ahe50dc-fan.c > @@ -0,0 +1,84 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Delta AHE-50DC power shelf fan control module driver > + * > + * Copyright 2021 Zev Weiss <zev@xxxxxxxxxxxxxxxxx> > + */ > + > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/i2c.h> > +#include <linux/pmbus.h> Alphabetic include file order please. > + > +#include "pmbus.h" > + > +#define AHE50DC_PMBUS_READ_TEMP4 0xd0 > + > +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; > + } > + return -ENODATA; > +} > + > +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, How did you determine the exponents ? The referenced driver doesn't seem to make a difference between voltage and temperature exponents (nor fan speed, which is a bit odd). > + .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, > + .read_word_data = ahe50dc_fan_read_word_data, > +}; > + > +static struct pmbus_platform_data ahe50dc_fan_data = { > + .flags = PMBUS_NO_CAPABILITY, > +}; Is that necessary ? It should only be used if trying to read CAPABILITY reports bad data. Thanks, Guenter > + > +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@xxxxxxxxxxxxxxxxx>"); > +MODULE_DESCRIPTION("Driver for Delta AHE-50DC power shelf fan control module"); > +MODULE_LICENSE("GPL"); > +MODULE_IMPORT_NS(PMBUS); > -- > 2.34.1 >
