This device is an integrated module of the Delta AHE-50DC Open19 power shelf. I haven't been able to procure any proper documentation for it, but it seems to be a (somewhat minimally) PMBus-compliant device. It provides four fan speeds, four temperatures (three standard and one manufacturer-specific via a virtual second page), and a vin reading. Signed-off-by: Zev Weiss <zev@xxxxxxxxxxxxxxxxx> --- MAINTAINERS | 6 ++ drivers/hwmon/pmbus/Kconfig | 10 +++ drivers/hwmon/pmbus/Makefile | 1 + drivers/hwmon/pmbus/delta-ahe50dc-fan.c | 114 ++++++++++++++++++++++++ 4 files changed, 131 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..0b1157b883aa 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -66,6 +66,16 @@ 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" + 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..40dffd9c4cbf --- /dev/null +++ b/drivers/hwmon/pmbus/delta-ahe50dc-fan.c @@ -0,0 +1,114 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Delta AHE-50DC power shelf fan control module driver + * + * Copyright 2021 Zev Weiss <zev@xxxxxxxxxxxxxxxxx> + */ + +#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_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, + .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@xxxxxxxxxxxxxxxxx>"); +MODULE_DESCRIPTION("Driver for Delta AHE-50DC power shelf fan control module"); +MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS(PMBUS); -- 2.34.1
