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Message-ID: <CAHkHK08ZkZDoVQ0qfLPcO=_=-OAmx+N5BGHRgZkoxLUNQzTp5g@mail.gmail.com>
Date: Fri, 16 Aug 2019 10:44:01 +0800
From: John Wang <wangzqbj@...pur.com>
To: Guenter Roeck <linux@...ck-us.net>
CC: Vijay Khemka <vijaykhemka@...com>,
"linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
"jdelvare@...e.com" <jdelvare@...e.com>,
"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
"openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
"corbet@....net" <corbet@....net>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"duanzhijia01@...pur.com" <duanzhijia01@...pur.com>
Subject: Re: [PATCH v4 2/2] hwmon: pmbus: Add Inspur Power System power supply driver
On Fri, Aug 16, 2019 at 3:41 AM Guenter Roeck <linux@...ck-us.net> wrote:
>
> On Thu, Aug 15, 2019 at 06:43:52PM +0000, Vijay Khemka wrote:
> >
> >
> > On 8/13/19, 1:36 AM, "openbmc on behalf of John Wang" <openbmc-bounces+vijaykhemka=fb.com@...ts.ozlabs.org on behalf of wangzqbj@...pur.com> wrote:
> >
> > Add the driver to monitor Inspur Power System power supplies
> > with hwmon over pmbus.
> >
> > This driver adds sysfs attributes for additional power supply data,
> > including vendor, model, part_number, serial number,
> > firmware revision, hardware revision, and psu mode(active/standby).
> >
> > Signed-off-by: John Wang <wangzqbj@...pur.com>
> > ---
> > v4:
> > - Remove the additional tabs in the Makefile
> > - Rebased on 5.3-rc4, not 5.2
> > v3:
> > - Sort kconfig/makefile entries alphabetically
> > - Remove unnecessary initialization
> > - Use ATTRIBUTE_GROUPS instead of expanding directly
> > - Use memscan to avoid reimplementation
> > v2:
> > - Fix typos in commit message
> > - Invert Christmas tree
> > - Configure device with sysfs attrs, not debugfs entries
> > - Fix errno in fw_version_read, ENODATA to EPROTO
> > - Change the print format of fw-version
> > - Use sysfs_streq instead of strcmp("xxx" "\n", "xxx")
> > - Document sysfs attributes
> > ---
> > Documentation/hwmon/inspur-ipsps1.rst | 79 +++++++++
> > drivers/hwmon/pmbus/Kconfig | 9 +
> > drivers/hwmon/pmbus/Makefile | 1 +
> > drivers/hwmon/pmbus/inspur-ipsps.c | 226 ++++++++++++++++++++++++++
> > 4 files changed, 315 insertions(+)
> > create mode 100644 Documentation/hwmon/inspur-ipsps1.rst
> > create mode 100644 drivers/hwmon/pmbus/inspur-ipsps.c
> >
> > diff --git a/Documentation/hwmon/inspur-ipsps1.rst b/Documentation/hwmon/inspur-ipsps1.rst
> > new file mode 100644
> > index 000000000000..aa19f0ccc8b0
> > --- /dev/null
> > +++ b/Documentation/hwmon/inspur-ipsps1.rst
> > @@ -0,0 +1,79 @@
> > +Kernel driver inspur-ipsps1
> > +=======================
> > +
> > +Supported chips:
> > +
> > + * Inspur Power System power supply unit
> > +
> > +Author: John Wang <wangzqbj@...pur.com>
> > +
> > +Description
> > +-----------
> > +
> > +This driver supports Inspur Power System power supplies. This driver
> > +is a client to the core PMBus driver.
> > +
> > +Usage Notes
> > +-----------
> > +
> > +This driver does not auto-detect devices. You will have to instantiate the
> > +devices explicitly. Please see Documentation/i2c/instantiating-devices for
> > +details.
> > +
> > +Sysfs entries
> > +-------------
> > +
> > +The following attributes are supported:
> > +
> > +======================= ======================================================
> > +curr1_input Measured input current
> > +curr1_label "iin"
> > +curr1_max Maximum current
> > +curr1_max_alarm Current high alarm
> > +curr2_input Measured output current in mA.
> > +curr2_label "iout1"
> > +curr2_crit Critical maximum current
> > +curr2_crit_alarm Current critical high alarm
> > +curr2_max Maximum current
> > +curr2_max_alarm Current high alarm
> > +
> > Please align above details.
Sorry for the mix of table and space
> > +fan1_alarm Fan 1 warning.
> > +fan1_fault Fan 1 fault.
> > +fan1_input Fan 1 speed in RPM.
> > +
> > +in1_alarm Input voltage under-voltage alarm.
> > +in1_input Measured input voltage in mV.
> > +in1_label "vin"
> > +in2_input Measured output voltage in mV.
> > +in2_label "vout1"
> > +in2_lcrit Critical minimum output voltage
> > +in2_lcrit_alarm Output voltage critical low alarm
> > +in2_max Maximum output voltage
> > +in2_max_alarm Output voltage high alarm
> > +in2_min Minimum output voltage
> > +in2_min_alarm Output voltage low alarm
> > +
> > +power1_alarm Input fault or alarm.
> > +power1_input Measured input power in uW.
> > +power1_label "pin"
> > +power1_max Input power limit
> > +power2_max_alarm Output power high alarm
> > +power2_max Output power limit
> > +power2_input Measured output power in uW.
> > +power2_label "pout"
> > +
> > Same alignment issue in description.
will fix.
> > +temp[1-3]_input Measured temperature
> > +temp[1-2]_max Maximum temperature
> > +temp[1-3]_max_alarm Temperature high alarm
> > +
> > +vendor Manufacturer name
> > +model Product model
> > +part_number Product part number
> > +serial_number Product serial number
> > +fw_version Firmware version
> > +hw_version Hardware version
> > +mode Work mode. Can be set to active or
> > + standby, when set to standby, PSU will
> > + automatically switch between standby
> > + and redundancy mode.
> > +======================= ======================================================
> > diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
> > index b6588483fae1..d62d69bb7e49 100644
> > --- a/drivers/hwmon/pmbus/Kconfig
> > +++ b/drivers/hwmon/pmbus/Kconfig
> > @@ -46,6 +46,15 @@ config SENSORS_IBM_CFFPS
> > This driver can also be built as a module. If so, the module will
> > be called ibm-cffps.
> >
> > +config SENSORS_INSPUR_IPSPS
> > + tristate "INSPUR Power System Power Supply"
> > + help
> > + If you say yes here you get hardware monitoring support for the INSPUR
> > + Power System power supply.
> > +
> > + This driver can also be built as a module. If so, the module will
> > + be called inspur-ipsps.
> > +
> > config SENSORS_IR35221
> > tristate "Infineon IR35221"
> > help
> > diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
> > index c950ea9a5d00..03bacfcfd660 100644
> > --- a/drivers/hwmon/pmbus/Makefile
> > +++ b/drivers/hwmon/pmbus/Makefile
> > @@ -7,6 +7,7 @@ obj-$(CONFIG_PMBUS) += pmbus_core.o
> > obj-$(CONFIG_SENSORS_PMBUS) += pmbus.o
> > obj-$(CONFIG_SENSORS_ADM1275) += adm1275.o
> > obj-$(CONFIG_SENSORS_IBM_CFFPS) += ibm-cffps.o
> > +obj-$(CONFIG_SENSORS_INSPUR_IPSPS) += inspur-ipsps.o
> > obj-$(CONFIG_SENSORS_IR35221) += ir35221.o
> > obj-$(CONFIG_SENSORS_IR38064) += ir38064.o
> > obj-$(CONFIG_SENSORS_IRPS5401) += irps5401.o
> > diff --git a/drivers/hwmon/pmbus/inspur-ipsps.c b/drivers/hwmon/pmbus/inspur-ipsps.c
> > new file mode 100644
> > index 000000000000..fa981b881a60
> > --- /dev/null
> > +++ b/drivers/hwmon/pmbus/inspur-ipsps.c
> > @@ -0,0 +1,226 @@
> > +// SPDX-License-Identifier: GPL-2.0-or-later
> > +/*
> > + * Copyright 2019 Inspur Corp.
> > + */
> > +
> > +#include <linux/debugfs.h>
> > +#include <linux/device.h>
> > +#include <linux/fs.h>
> > +#include <linux/i2c.h>
> > +#include <linux/module.h>
> > +#include <linux/pmbus.h>
> > +#include <linux/hwmon-sysfs.h>
> > +
> > +#include "pmbus.h"
> > +
> > +#define IPSPS_REG_VENDOR_ID 0x99
> > +#define IPSPS_REG_MODEL 0x9A
> > +#define IPSPS_REG_FW_VERSION 0x9B
> > +#define IPSPS_REG_PN 0x9C
> > +#define IPSPS_REG_SN 0x9E
> > +#define IPSPS_REG_HW_VERSION 0xB0
> > +#define IPSPS_REG_MODE 0xFC
> > +
> > +#define MODE_ACTIVE 0x55
> > +#define MODE_STANDBY 0x0E
> > +#define MODE_REDUNDANCY 0x00
> > +
> > +#define MODE_ACTIVE_STRING "active"
> > +#define MODE_STANDBY_STRING "standby"
> > +#define MODE_REDUNDANCY_STRING "redundancy"
> > +
> > +enum ipsps_index {
> > + vendor,
> > + model,
> > + fw_version,
> > + part_number,
> > + serial_number,
> > + hw_version,
> > + mode,
> > + num_regs,
> > +};
> > +
> > +static const u8 ipsps_regs[num_regs] = {
> > + [vendor] = IPSPS_REG_VENDOR_ID,
> > + [model] = IPSPS_REG_MODEL,
> > + [fw_version] = IPSPS_REG_FW_VERSION,
> > + [part_number] = IPSPS_REG_PN,
> > + [serial_number] = IPSPS_REG_SN,
> > + [hw_version] = IPSPS_REG_HW_VERSION,
> > + [mode] = IPSPS_REG_MODE,
> > +};
> > +
> > +static ssize_t ipsps_string_show(struct device *dev,
> > + struct device_attribute *devattr,
> > + char *buf)
> > +{
> > + u8 reg;
> > + int rc;
> > + char *p;
> > + char data[I2C_SMBUS_BLOCK_MAX + 1];
> > + struct i2c_client *client = to_i2c_client(dev->parent);
> > + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> > +
> > + reg = ipsps_regs[attr->index];
> > + rc = i2c_smbus_read_block_data(client, reg, data);
> > + if (rc < 0)
> > + return rc;
> > +
> > + /* filled with printable characters, ending with # */
> > + p = memscan(data, '#', rc);
> > + *p = '\0';
> > +
> > + return snprintf(buf, PAGE_SIZE, "%s\n", data);
> > +}
> > +
> > +static ssize_t ipsps_fw_version_show(struct device *dev,
> > + struct device_attribute *devattr,
> > + char *buf)
> > +{
> > + u8 reg;
> > + int rc;
> > + u8 data[I2C_SMBUS_BLOCK_MAX] = { 0 };
> > + struct i2c_client *client = to_i2c_client(dev->parent);
> > + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> > +
> > + reg = ipsps_regs[attr->index];
> > + rc = i2c_smbus_read_block_data(client, reg, data);
> > + if (rc < 0)
> > + return rc;
> > +
> > + if (rc != 6)
> > + return -EPROTO;
> > +
> > + return snprintf(buf, PAGE_SIZE, "%u.%02u%u-%u.%02u\n",
> > + data[1], data[2]/* < 100 */, data[3]/*< 10*/,
> > + data[4], data[5]/* < 100 */);
> > +}
> > +
> > +static ssize_t ipsps_mode_show(struct device *dev,
> > + struct device_attribute *devattr, char *buf)
> > +{
> > + u8 reg;
> > + int rc;
> > + struct i2c_client *client = to_i2c_client(dev->parent);
> > + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> > +
> > + reg = ipsps_regs[attr->index];
> > + rc = i2c_smbus_read_byte_data(client, reg);
> > + if (rc < 0)
> > + return rc;
> > +
> > + switch (rc) {
> > + case MODE_ACTIVE:
> > + return snprintf(buf, PAGE_SIZE, "[%s] %s %s\n",
> > + MODE_ACTIVE_STRING,
> > + MODE_STANDBY_STRING, MODE_REDUNDANCY_STRING);
> > + case MODE_STANDBY:
> > + return snprintf(buf, PAGE_SIZE, "%s [%s] %s\n",
> > + MODE_ACTIVE_STRING,
> > + MODE_STANDBY_STRING, MODE_REDUNDANCY_STRING);
> > + case MODE_REDUNDANCY:
> > + return snprintf(buf, PAGE_SIZE, "%s %s [%s]\n",
> > + MODE_ACTIVE_STRING,
> > + MODE_STANDBY_STRING, MODE_REDUNDANCY_STRING);
> > + default:
> > + return snprintf(buf, PAGE_SIZE, "unspecified\n");
> > + }
> > +}
> > +
> > +static ssize_t ipsps_mode_store(struct device *dev,
> > + struct device_attribute *devattr,
> > + const char *buf, size_t count)
> > +{
> > + u8 reg;
> > + int rc;
> > + struct i2c_client *client = to_i2c_client(dev->parent);
> > + struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
> > +
> > + reg = ipsps_regs[attr->index];
> > + if (sysfs_streq(MODE_STANDBY_STRING, buf)) {
> > + rc = i2c_smbus_write_byte_data(client, reg,
> > + MODE_STANDBY);
> > + if (rc < 0)
> > + return rc;
> > + return count;
> > + } else if (sysfs_streq(MODE_ACTIVE_STRING, buf)) {
> > + rc = i2c_smbus_write_byte_data(client, reg,
> > + MODE_ACTIVE);
> > + if (rc < 0)
> > + return rc;
> > + return count;
> > + }
> > +
> > + return -EINVAL;
> > +}
> > +
> > +static SENSOR_DEVICE_ATTR_RO(vendor, ipsps_string, vendor);
> > +static SENSOR_DEVICE_ATTR_RO(model, ipsps_string, model);
> > +static SENSOR_DEVICE_ATTR_RO(part_number, ipsps_string, part_number);
> > +static SENSOR_DEVICE_ATTR_RO(serial_number, ipsps_string, serial_number);
> > +static SENSOR_DEVICE_ATTR_RO(hw_version, ipsps_string, hw_version);
> > +static SENSOR_DEVICE_ATTR_RO(fw_version, ipsps_fw_version, fw_version);
> > +static SENSOR_DEVICE_ATTR_RW(mode, ipsps_mode, mode);
> > +
> > +static struct attribute *ipsps_attrs[] = {
> > + &sensor_dev_attr_vendor.dev_attr.attr,
> > + &sensor_dev_attr_model.dev_attr.attr,
> > + &sensor_dev_attr_part_number.dev_attr.attr,
> > + &sensor_dev_attr_serial_number.dev_attr.attr,
> > + &sensor_dev_attr_hw_version.dev_attr.attr,
> > + &sensor_dev_attr_fw_version.dev_attr.attr,
> > + &sensor_dev_attr_mode.dev_attr.attr,
> > + NULL,
> > +};
> > +
> > +ATTRIBUTE_GROUPS(ipsps);
> > +
> > +static struct pmbus_driver_info ipsps_info = {
> > + .pages = 1,
> > + .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT |
> > + PMBUS_HAVE_IIN | PMBUS_HAVE_POUT | PMBUS_HAVE_PIN |
> > + PMBUS_HAVE_FAN12 | PMBUS_HAVE_TEMP | PMBUS_HAVE_TEMP2 |
> > + PMBUS_HAVE_TEMP3 | PMBUS_HAVE_STATUS_VOUT |
> > + PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |
> > + PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_STATUS_FAN12,
> > This can be dynamic read by chip identify function
>
> PMBUS_SKIP_STATUS_CHECK weakens auto-detetcion to some degree,
> and auto-detection takes time since it needs to poll all registers
> to determine if they exist. I don't mind if you insist, but I don't
> immediately see the benefits.
ipsps does not specify that the vendor must support the status_cml
register( some vendor do not support),
so PMBUS_SKIP_STATUS_CHECK is used here.
>
> > + .groups = ipsps_groups,
> > +};
> > +
> > +static struct pmbus_platform_data ipsps_pdata = {
> > + .flags = PMBUS_SKIP_STATUS_CHECK,
> > +};
> > +
> > +static int ipsps_probe(struct i2c_client *client,
> > + const struct i2c_device_id *id)
> > +{
> > + client->dev.platform_data = &ipsps_pdata;
> > Allocate memory for this platform data inside tis function rather than having global variable.
>
> Does that have any value other than consuming more memory
> if there are multiple instances of the driver ?
>
> > + return pmbus_do_probe(client, id, &ipsps_info);
> > +}
> > +
> > +static const struct i2c_device_id ipsps_id[] = {
> > + { "inspur_ipsps1", 0 },
> > + {}
> > +};
> > +MODULE_DEVICE_TABLE(i2c, ipsps_id);
> > +
> > +static const struct of_device_id ipsps_of_match[] = {
> > + { .compatible = "inspur,ipsps1" },
> > + {}
> > +};
> > +MODULE_DEVICE_TABLE(of, ipsps_of_match);
> > +
> > +static struct i2c_driver ipsps_driver = {
> > + .driver = {
> > + .name = "inspur-ipsps",
> > + .of_match_table = ipsps_of_match,
> > + },
> > + .probe = ipsps_probe,
> > + .remove = pmbus_do_remove,
> > + .id_table = ipsps_id,
> > +};
> > +
> > +module_i2c_driver(ipsps_driver);
> > +
> > +MODULE_AUTHOR("John Wang");
> > +MODULE_DESCRIPTION("PMBus driver for Inspur Power System power supplies");
> > +MODULE_LICENSE("GPL");
> > --
> > 2.17.1
> >
> >
> >
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