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Thu, 15 Aug 2019 20:13:05 -0700 (PDT) Received: from server.roeck-us.net ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id t9sm2641042pji.18.2019.08.15.20.13.03 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 15 Aug 2019 20:13:04 -0700 (PDT) Subject: Re: [PATCH v4 2/2] hwmon: pmbus: Add Inspur Power System power supply driver To: John Wang Cc: Vijay Khemka , "linux-hwmon@vger.kernel.org" , "jdelvare@suse.com" , "linux-doc@vger.kernel.org" , "openbmc@lists.ozlabs.org" , "corbet@lwn.net" , "linux-kernel@vger.kernel.org" , "duanzhijia01@inspur.com" References: <20190813083412.8668-1-wangzqbj@inspur.com> <70B3A211-2F43-4712-9B92-D407AA3C3934@fb.com> <20190815194102.GA11916@roeck-us.net> From: Guenter Roeck Message-ID: <9b198c90-714a-01a8-a004-5f17adcc6dee@roeck-us.net> Date: Thu, 15 Aug 2019 20:13:02 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 8/15/19 7:44 PM, John Wang wrote: > On Fri, Aug 16, 2019 at 3:41 AM Guenter Roeck 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" 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 >>> --- >>> 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 >>> + >>> +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 >>> +#include >>> +#include >>> +#include >>> +#include >>> +#include >>> +#include >>> + >>> +#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. > I did not question that. I did question the request to use auto-detection, which is quite unusual since you have a dedicated driver for the chip anyway. Asking more directly: What is the problem with specifying capabilities directly, and what is the advantage of using auto-detection ? Guenter >> >>> + .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 >>> >>> >>> >