Re: [PATCH 1/3] hwmon: (pmbus) Add driver for Delta DPS-920AB PSU

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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








[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]


  Powered by Linux