hwmon: pmbus: Add Inspur Power System power supply driver

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@inspur.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20190819091509.29276-1-wangzqbj@inspur.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/hwmon/inspur-ipsps1.rst

+Kernel driver inspur-ipsps1
+=======================
+
+Supported chips:
+
+  * Inspur Power System power supply unit
+
+Author: John Wang <wangzqbj@inspur.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
+
+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"
+
+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.
+======================= ======================================================

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

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

drivers/hwmon/pmbus/inspur-ipsps.c

+// 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,
+	.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;
+	return pmbus_do_probe(client, id, &ipsps_info);
+}
+
+static const struct i2c_device_id ipsps_id[] = {
+	{ "ipsps1", 0 },
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, ipsps_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id ipsps_of_match[] = {
+	{ .compatible = "inspur,ipsps1" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, ipsps_of_match);
+#endif
+
+static struct i2c_driver ipsps_driver = {
+	.driver = {
+		.name = "inspur-ipsps",
+		.of_match_table = of_match_ptr(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");