Re: [PATCH 1/3] hwmon: (pmbus) Add driver for Delta DPS-920AB PSU
From: Guenter Roeck
Date: Wed May 19 2021 - 09:19:29 EST
On 5/19/21 5:38 AM, Robert Marko wrote:
On Fri, Apr 30, 2021 at 3:48 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
On Fri, Apr 30, 2021 at 03:27:33PM +0200, Robert Marko wrote:
This adds support for the Delta DPS-920AB PSU.
Only missing feature is fan control which the PSU supports.
Signed-off-by: Robert Marko <robert.marko@xxxxxxxxxx>
---
Documentation/hwmon/dps920ab.rst | 80 ++++++++++++++++++++++++++++++++
Documentation/hwmon/index.rst | 1 +
drivers/hwmon/pmbus/Kconfig | 9 ++++
drivers/hwmon/pmbus/Makefile | 1 +
drivers/hwmon/pmbus/dps920ab.c | 63 +++++++++++++++++++++++++
5 files changed, 154 insertions(+)
create mode 100644 Documentation/hwmon/dps920ab.rst
create mode 100644 drivers/hwmon/pmbus/dps920ab.c
diff --git a/Documentation/hwmon/dps920ab.rst b/Documentation/hwmon/dps920ab.rst
new file mode 100644
index 000000000000..df0aef530c7e
--- /dev/null
+++ b/Documentation/hwmon/dps920ab.rst
@@ -0,0 +1,80 @@
+.. SPDX-License-Identifier: GPL-2.0-or-later
+
+Kernel driver dps920ab
+========================
+
+Supported chips:
+
+ * Delta DPS920AB
+
+ Prefix: 'dps920ab'
+
+ Addresses scanned: -
+
+Authors:
+ Robert Marko <robert.marko@xxxxxxxxxx>
+
+
+Description
+-----------
+
+This driver implements support for Delta DPS920AB 920W 54V DC single output
+power supply with PMBus support.
+
+The driver is a client driver to the core PMBus driver.
+Please see Documentation/hwmon/pmbus.rst for details on PMBus client drivers.
+
+
+Usage Notes
+-----------
+
+This driver does not auto-detect devices. You will have to instantiate the
+devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for
+details.
+
+
+Sysfs entries
+-------------
+
+======================= ======================================================
+curr1_label "iin"
+curr1_input Measured input current
+curr1_crit Critical maximum current
+curr1_crit_alarm Current critical high alarm
+
+curr2_label "iout1"
+curr2_input Measured output current
+curr2_crit Critical maximum current
+curr2_crit_alarm Current critical high alarm
+
+in1_label "vin"
+in1_input Measured input voltage
+in1_lcrit Critical minimum input voltage
+in1_lcrit_alarm Input voltage critical low alarm
+in1_crit Critical maximum input voltage
+in1_crit_alarm Input voltage critical high alarm
+
+in2_label "vout1"
+in2_input Measured output voltage
+in2_lcrit Critical minimum output voltage
+in2_lcrit_alarm Output voltage critical low alarm
+in2_crit Critical maximum output voltage
+in2_crit_alarm Output voltage critical high alarm
+
+power1_label "pin"
+power1_input Measured input power
+power1_alarm Input power high alarm
+
+power2_label "pout1"
+power2_input Measured output power
+
+temp[1-2]_input Measured temperature
+temp[1-2]_crit Critical high temperature
+temp[1-2]_crit_alarm Chip temperature critical high alarm
+temp[1-2]_max Maximum temperature
+temp[1-2]_max_alarm Chip temperature high alarm
+
+fan1_alarm Fan 1 warning.
+fan1_fault Fan 1 fault.
+fan1_input Fan 1 speed in RPM.
+======================= ======================================================
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index 8d5a2df1ecb6..b24436f22052 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -54,6 +54,7 @@ Hardware Monitoring Kernel Drivers
dell-smm-hwmon
dme1737
drivetemp
+ dps920ab
ds1621
ds620
emc1403
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 32d2fc850621..865ade0aa205 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -66,6 +66,15 @@ config SENSORS_IBM_CFFPS
This driver can also be built as a module. If so, the module will
be called ibm-cffps.
+config SENSORS_DPS920AB
+ tristate "Delta DPS920AB Power Supply"
+ help
+ If you say yes here you get hardware monitoring support for Delta
+ DPS920AB Power Supplies.
+
+ This driver can also be built as a module. If so, the module will
+ be called dps920ab.
+
config SENSORS_INSPUR_IPSPS
tristate "INSPUR Power System Power Supply"
help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 6a4ba0fdc1db..f59ba0123d68 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_IBM_CFFPS) += ibm-cffps.o
+obj-$(CONFIG_SENSORS_DPS920AB) += dps920ab.o
obj-$(CONFIG_SENSORS_INSPUR_IPSPS) += inspur-ipsps.o
obj-$(CONFIG_SENSORS_IR35221) += ir35221.o
obj-$(CONFIG_SENSORS_IR38064) += ir38064.o
diff --git a/drivers/hwmon/pmbus/dps920ab.c b/drivers/hwmon/pmbus/dps920ab.c
new file mode 100644
index 000000000000..d579ed9f879c
--- /dev/null
+++ b/drivers/hwmon/pmbus/dps920ab.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for Delta DPS920AB PSU
+ *
+ * Copyright (C) 2021 Delta Networks, Inc.
+ * Copyright (C) 2021 Sartura Ltd.
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include "pmbus.h"
+
+static struct pmbus_driver_info dps920ab_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_FAN] = linear,
+ .format[PSC_TEMPERATURE] = linear,
+
+ .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN |
+ PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
+ PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
+ PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
+ PMBUS_HAVE_PIN | PMBUS_HAVE_POUT |
+ PMBUS_HAVE_FAN12 | PMBUS_HAVE_STATUS_FAN12 |
+ PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_STATUS_TEMP,
+};
+
+static int dps920ab_probe(struct i2c_client *client)
+{
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_BYTE_DATA |
+ I2C_FUNC_SMBUS_WORD_DATA))
+ return -ENODEV;
This check is done in pmbus_do_probe(), and repeating it here does not add
any value.
Ok, makes sense.
That makes me wonder: Is this driver needed in the first place, or could
it be added to drivers/hwmon/pmbus/pmbus.c ?
It could be added as a generic driver, but that creates properties in
the sysfs that this thing
does not support like 3 voltage readings, 3 fans, and so on.
Can you be more specific ? What additional unsupported attributes
are added, and why ? Are you saying the PSU reports registers as
existing which do not really exist ? If so, which registers are those ?
In this context, I have a hard time finding a reference for
this power supply. Do you have a datasheet or some other documents
you can share ?
Thanks,
Guenter
Is it okay to keep it as a separate driver then?
Regards,
Robert
Thanks,
Guenter
+
+ return pmbus_do_probe(client, &dps920ab_info);
+}
+
+static const struct of_device_id __maybe_unused dps920ab_of_match[] = {
+ { .compatible = "delta,dps920ab", },
+ {}
+};
+
+MODULE_DEVICE_TABLE(of, dps920ab_of_match);
+
+static struct i2c_driver dps920ab_driver = {
+ .driver = {
+ .name = "dps920ab",
+ .of_match_table = of_match_ptr(dps920ab_of_match),
+ },
+ .probe_new = dps920ab_probe,
+};
+
+module_i2c_driver(dps920ab_driver);
+
+MODULE_AUTHOR("Robert Marko <robert.marko@xxxxxxxxxx>");
+MODULE_DESCRIPTION("PMBus driver for Delta DPS920AB PSU");
+MODULE_LICENSE("GPL");
--
2.31.1