Add basic monitoring support as well as port on/off control for Texas Instruments TPS23861 PoE PSE IC.
Signed-off-by: Robert Marko <[email protected]> Cc: Luka Perkov <[email protected]> --- drivers/hwmon/Kconfig | 11 ++ drivers/hwmon/Makefile | 1 + drivers/hwmon/tps23861.c | 398 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 410 insertions(+) create mode 100644 drivers/hwmon/tps23861.c diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index a850e4f0e0bd..3368ecfa7a9c 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1102,6 +1102,17 @@ config SENSORS_TC654 This driver can also be built as a module. If so, the module will be called tc654. +config SENSORS_TPS23861 + tristate "Texas Instruments TPS23861 PoE PSE" + depends on I2C + select REGMAP_I2C + help + If you say yes here you get support for Texas Instruments + TPS23861 802.3at PoE PSE chips. + + This driver can also be built as a module. If so, the module + will be called tps23861. + config SENSORS_MENF21BMC_HWMON tristate "MEN 14F021P00 BMC Hardware Monitoring" depends on MFD_MENF21BMC diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 9db2903b61e5..7493e9d5dc43 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -141,6 +141,7 @@ obj-$(CONFIG_SENSORS_MAX31790) += max31790.o obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o obj-$(CONFIG_SENSORS_MCP3021) += mcp3021.o obj-$(CONFIG_SENSORS_TC654) += tc654.o +obj-$(CONFIG_SENSORS_TPS23861) += tps23861.o obj-$(CONFIG_SENSORS_MLXREG_FAN) += mlxreg-fan.o obj-$(CONFIG_SENSORS_MENF21BMC_HWMON) += menf21bmc_hwmon.o obj-$(CONFIG_SENSORS_MR75203) += mr75203.o diff --git a/drivers/hwmon/tps23861.c b/drivers/hwmon/tps23861.c new file mode 100644 index 000000000000..e8b614267084 --- /dev/null +++ b/drivers/hwmon/tps23861.c @@ -0,0 +1,398 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Driver for the TI TPS23861 PoE PSE. + * + * Author: Robert Marko <[email protected]> + */ + +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/i2c.h> +#include <linux/regmap.h> +#include <linux/bitfield.h> +#include <linux/delay.h> + +#define FW_VERSION 0x41 +#define TEMPERATURE 0x2c +#define INPUT_VOLTAGE_LSB 0x2e +#define INPUT_VOLTAGE_MSB 0x2f +#define PORT_1_CURRENT_LSB 0x30 +#define PORT_1_CURRENT_MSB 0x31 +#define PORT_1_VOLTAGE_LSB 0x32 +#define PORT_1_VOLTAGE_MSB 0x33 +#define PORT_2_CURRENT_LSB 0x34 +#define PORT_2_CURRENT_MSB 0x35 +#define PORT_2_VOLTAGE_LSB 0x36 +#define PORT_2_VOLTAGE_MSB 0x37 +#define PORT_3_CURRENT_LSB 0x38 +#define PORT_3_CURRENT_MSB 0x39 +#define PORT_3_VOLTAGE_LSB 0x3a +#define PORT_3_VOLTAGE_MSB 0x3b +#define PORT_4_CURRENT_LSB 0x3c +#define PORT_4_CURRENT_MSB 0x3d +#define PORT_4_VOLTAGE_LSB 0x3e +#define PORT_4_VOLTAGE_MSB 0x3f +#define VOLTAGE_CURRENT_MASK GENMASK(13, 0) +#define PORT_1_STATUS 0x0c +#define PORT_2_STATUS 0x0d +#define PORT_3_STATUS 0x0e +#define PORT_4_STATUS 0x0f +#define PORT_STATUS_CLASS_MASK GENMASK(7, 4) +#define PORT_STATUS_DETECT_MASK GENMASK(3, 0) +#define PORT_CLASS_UNKNOWN 0 +#define PORT_CLASS_1 1 +#define PORT_CLASS_2 2 +#define PORT_CLASS_3 3 +#define PORT_CLASS_4 4 +#define PORT_CLASS_RESERVED 5 +#define PORT_CLASS_0 6 +#define PORT_CLASS_OVERCURRENT 7 +#define PORT_CLASS_MISMATCH 8 +#define PORT_DETECT_UNKNOWN 0 +#define PORT_DETECT_SHORT 1 +#define PORT_DETECT_RESERVED 2 +#define PORT_DETECT_RESISTANCE_LOW 3 +#define PORT_DETECT_RESISTANCE_OK 4 +#define PORT_DETECT_RESISTANCE_HIGH 5 +#define PORT_DETECT_OPEN_CIRCUIT 6 +#define PORT_DETECT_RESERVED_2 7 +#define PORT_DETECT_MOSFET_FAULT 8 +#define PORT_DETECT_LEGACY 9 +/* Measurment beyond clamp voltage */ +#define PORT_DETECT_CAPACITANCE_INVALID_BEYOND 10 +/* Insufficient voltage delta */ +#define PORT_DETECT_CAPACITANCE_INVALID_DELTA 11 +#define PORT_DETECT_CAPACITANCE_OUT_OF_RANGE 12 +#define POE_PLUS 0x40 + +#define DETECT_CLASS_RESTART 0x18 +#define POWER_ENABLE 0x19 + +#define TEMPERATURE_LSB 652 /* 0.652 degrees Celsius */ +#define VOLTAGE_LSB 3662 /* 3.662 mV */ +#define SHUNT_RESISTOR_DEFAULT 255000 /* 255 mOhm */ +#define CURRENT_LSB_255 62260 /* 62.260 uA */ +#define CURRENT_LSB_250 61039 /* 61.039 uA */ + +struct tps23861_data { + struct regmap *regmap; + u32 shunt_resistor; +}; + +static struct regmap_config tps23861_regmap_config = { + .reg_bits = 8, + .val_bits = 8, +}; + +static ssize_t tps23861_simple_value_show(struct device *dev, + struct device_attribute *da, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct tps23861_data *data = dev_get_drvdata(dev); + unsigned int regval; + + regmap_read(data->regmap, attr->index, ®val); + + return snprintf(buf, PAGE_SIZE, "%d\n", regval); +} + +static ssize_t tps23861_temperature_show(struct device *dev, + struct device_attribute *da, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct tps23861_data *data = dev_get_drvdata(dev); + unsigned int regval; + int temperature; + + regmap_read(data->regmap, attr->index, ®val); + + temperature = (regval * TEMPERATURE_LSB) - 20000; + + return snprintf(buf, PAGE_SIZE, "%d\n", temperature); +} + +static ssize_t tps23861_voltage_show(struct device *dev, + struct device_attribute *da, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct tps23861_data *data = dev_get_drvdata(dev); + u16 regval; + unsigned int voltage; + + regmap_bulk_read(data->regmap, attr->index, ®val, 2); + + voltage = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * VOLTAGE_LSB) / 1000; + + return snprintf(buf, PAGE_SIZE, "%u\n", voltage); +} + +static ssize_t tps23861_current_show(struct device *dev, + struct device_attribute *da, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct tps23861_data *data = dev_get_drvdata(dev); + u16 regval; + unsigned int current_mA; + unsigned int current_lsb; + + if (data->shunt_resistor == SHUNT_RESISTOR_DEFAULT) + current_lsb = CURRENT_LSB_255; + else + current_lsb = CURRENT_LSB_250; + + regmap_bulk_read(data->regmap, attr->index, ®val, 2); + + current_mA = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * current_lsb) / 1000000; + + return snprintf(buf, PAGE_SIZE, "%u\n", current_mA); +} + +static ssize_t tps23861_port_status_show(struct device *dev, + struct device_attribute *da, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct tps23861_data *data = dev_get_drvdata(dev); + char *detect_status, *class_status; + unsigned int regval; + u8 class, detect; + + regmap_read(data->regmap, attr->index, ®val); + detect = FIELD_GET(PORT_STATUS_DETECT_MASK, regval); + class = FIELD_GET(PORT_STATUS_CLASS_MASK, regval); + + switch (detect) { + case PORT_DETECT_UNKNOWN: + detect_status = "Unknown device"; + break; + case PORT_DETECT_SHORT: + detect_status = "Short circuit detected"; + break; + case PORT_DETECT_RESISTANCE_LOW: + detect_status = "Too low resistance detected"; + break; + case PORT_DETECT_RESISTANCE_OK: + detect_status = "Valid resistance detected"; + break; + case PORT_DETECT_RESISTANCE_HIGH: + detect_status = "Too high resistance detected"; + break; + case PORT_DETECT_OPEN_CIRCUIT: + detect_status = "Open circuit detected"; + break; + case PORT_DETECT_MOSFET_FAULT: + detect_status = "MOSFET fault detected"; + break; + case PORT_DETECT_LEGACY: + detect_status = "Legacy device detected"; + break; + case PORT_DETECT_CAPACITANCE_INVALID_BEYOND: + detect_status = "Invalid capacitance, beyond clamp voltage"; + break; + case PORT_DETECT_CAPACITANCE_INVALID_DELTA: + detect_status = "Invalid capacitance, insufficient voltage delta"; + break; + case PORT_DETECT_CAPACITANCE_OUT_OF_RANGE: + detect_status = "Valid capacitance, outside of legacy range"; + break; + case PORT_DETECT_RESERVED: + case PORT_DETECT_RESERVED_2: + default: + return -EINVAL; + } + + switch (class) { + case PORT_CLASS_UNKNOWN: + class_status = "Unknown class"; + break; + case PORT_CLASS_RESERVED: + case PORT_CLASS_0: + class_status = "Class 0"; + break; + case PORT_CLASS_1: + class_status = "Class 1"; + break; + case PORT_CLASS_2: + class_status = "Class 2"; + break; + case PORT_CLASS_3: + class_status = "Class 3"; + break; + case PORT_CLASS_4: + class_status = "Class 4"; + break; + case PORT_CLASS_OVERCURRENT: + class_status = "Overcurrent"; + break; + case PORT_CLASS_MISMATCH: + class_status = "Class mismatch"; + break; + default: + return -EINVAL; + } + + return snprintf(buf, PAGE_SIZE, "%s, %s\n", detect_status, class_status); +} + +static ssize_t tps23861_poe_plus_show(struct device *dev, + struct device_attribute *da, char *buf) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct tps23861_data *data = dev_get_drvdata(dev); + char *ports[4]; + unsigned int regval; + int i; + + regmap_read(data->regmap, attr->index, ®val); + + for (i = 0; i < 4; i++) { + if (BIT(i + 4) & regval) + ports[i] = "Yes"; + else + ports[i] = "No"; + } + + return snprintf(buf, PAGE_SIZE, "Port 1: %s\nPort 2: %s\nPort 3: %s\nPort 4: %s\n", + ports[0], ports[1], ports[2], ports[3]); +} + +static ssize_t tps23861_port_disable_store(struct device *dev, + struct device_attribute *da, + const char *buf, size_t count) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct tps23861_data *data = dev_get_drvdata(dev); + unsigned int regval, port; + int ret; + + ret = kstrtouint(buf, 0, &port); + if (ret < 0) + return ret; + + regmap_read(data->regmap, attr->index, ®val); + regval |= BIT(port + 3); + regmap_write(data->regmap, attr->index, regval); + + return count; +} + +static ssize_t tps23861_port_enable_store(struct device *dev, + struct device_attribute *da, + const char *buf, size_t count) +{ + struct sensor_device_attribute *attr = to_sensor_dev_attr(da); + struct tps23861_data *data = dev_get_drvdata(dev); + unsigned int regval, port; + int ret; + + ret = kstrtouint(buf, 0, &port); + if (ret < 0) + return ret; + + regmap_read(data->regmap, attr->index, ®val); + regval |= BIT(port - 1); + regval |= BIT(port + 3); + regmap_write(data->regmap, attr->index, regval); + + return count; +} + +static SENSOR_DEVICE_ATTR_RO(fw_ver, tps23861_simple_value, FW_VERSION); +static SENSOR_DEVICE_ATTR_RO(temperature, tps23861_temperature, TEMPERATURE); +static SENSOR_DEVICE_ATTR_RO(in_voltage, tps23861_voltage, INPUT_VOLTAGE_LSB); +static SENSOR_DEVICE_ATTR_RO(port1_current, tps23861_current, PORT_1_CURRENT_LSB); +static SENSOR_DEVICE_ATTR_RO(port1_voltage, tps23861_voltage, PORT_1_VOLTAGE_LSB); +static SENSOR_DEVICE_ATTR_RO(port1_status, tps23861_port_status, PORT_1_STATUS); +static SENSOR_DEVICE_ATTR_RO(port2_current, tps23861_current, PORT_2_CURRENT_LSB); +static SENSOR_DEVICE_ATTR_RO(port2_voltage, tps23861_voltage, PORT_2_VOLTAGE_LSB); +static SENSOR_DEVICE_ATTR_RO(port2_status, tps23861_port_status, PORT_2_STATUS); +static SENSOR_DEVICE_ATTR_RO(port3_current, tps23861_current, PORT_3_CURRENT_LSB); +static SENSOR_DEVICE_ATTR_RO(port3_voltage, tps23861_voltage, PORT_3_VOLTAGE_LSB); +static SENSOR_DEVICE_ATTR_RO(port3_status, tps23861_port_status, PORT_3_STATUS); +static SENSOR_DEVICE_ATTR_RO(port4_current, tps23861_current, PORT_4_CURRENT_LSB); +static SENSOR_DEVICE_ATTR_RO(port4_voltage, tps23861_voltage, PORT_4_VOLTAGE_LSB); +static SENSOR_DEVICE_ATTR_RO(port4_status, tps23861_port_status, PORT_4_STATUS); +static SENSOR_DEVICE_ATTR_RO(poe_plus_status, tps23861_poe_plus, POE_PLUS); +static SENSOR_DEVICE_ATTR_WO(port_disable, tps23861_port_disable, POWER_ENABLE); +static SENSOR_DEVICE_ATTR_WO(port_enable, tps23861_port_enable, DETECT_CLASS_RESTART); + +static struct attribute *tps23861_attrs[] = { + &sensor_dev_attr_fw_ver.dev_attr.attr, + &sensor_dev_attr_temperature.dev_attr.attr, + &sensor_dev_attr_in_voltage.dev_attr.attr, + &sensor_dev_attr_port1_current.dev_attr.attr, + &sensor_dev_attr_port1_voltage.dev_attr.attr, + &sensor_dev_attr_port1_status.dev_attr.attr, + &sensor_dev_attr_port2_current.dev_attr.attr, + &sensor_dev_attr_port2_voltage.dev_attr.attr, + &sensor_dev_attr_port2_status.dev_attr.attr, + &sensor_dev_attr_port3_current.dev_attr.attr, + &sensor_dev_attr_port3_voltage.dev_attr.attr, + &sensor_dev_attr_port3_status.dev_attr.attr, + &sensor_dev_attr_port4_current.dev_attr.attr, + &sensor_dev_attr_port4_voltage.dev_attr.attr, + &sensor_dev_attr_port4_status.dev_attr.attr, + &sensor_dev_attr_poe_plus_status.dev_attr.attr, + &sensor_dev_attr_port_disable.dev_attr.attr, + &sensor_dev_attr_port_enable.dev_attr.attr, + NULL, +}; + +static const struct attribute_group tps23861_group = { + .attrs = tps23861_attrs, +}; + +static const struct attribute_group *tps23861_groups[] = { + &tps23861_group, + NULL, +}; + +static int tps23861_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct tps23861_data *data; + struct device *hwmon_dev; + u32 shunt_resistor; + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->regmap = devm_regmap_init_i2c(client, &tps23861_regmap_config); + if (IS_ERR(data->regmap)) { + dev_err(dev, "failed to allocate register map\n"); + return PTR_ERR(data->regmap); + } + + if (of_property_read_u32(dev->of_node, "shunt-resistor-micro-ohms", &shunt_resistor) < 0) + data->shunt_resistor = shunt_resistor; + else + data->shunt_resistor = SHUNT_RESISTOR_DEFAULT; + + hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, + data, tps23861_groups); + if (IS_ERR(hwmon_dev)) + return PTR_ERR(hwmon_dev); + + return 0; +} + +static const struct of_device_id __maybe_unused tps23861_of_match[] = { + { .compatible = "ti,tps23861", }, + { }, +}; +MODULE_DEVICE_TABLE(of, tps23861_of_match); + +static struct i2c_driver tps23861_driver = { + .probe_new = tps23861_probe, + .driver = { + .name = "tps23861", + .of_match_table = of_match_ptr(tps23861_of_match), + }, +}; +module_i2c_driver(tps23861_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Robert Marko <[email protected]>"); +MODULE_DESCRIPTION("TI TPS23861 PoE PSE"); -- 2.29.2
