| Message ID | 20201219191121.85142-2-robert.marko@sartura.hr |
|---|---|
| State | New |
| Headers | show |
| Series | [v2,1/3] dt-bindings: hwmon: Add TI TPS23861 bindings | expand |
On 12/19/20 11:11 AM, Robert Marko wrote: > Add basic monitoring support as well as port on/off control for Texas > Instruments TPS23861 PoE PSE IC. > > Signed-off-by: Robert Marko <robert.marko@sartura.hr> > Cc: Luka Perkov <luka.perkov@sartura.hr> > --- > Changes in v2: > * Convert to devm_hwmon_device_register_with_info() > * Change license > > drivers/hwmon/Kconfig | 11 + > drivers/hwmon/Makefile | 1 + > drivers/hwmon/tps23861.c | 538 +++++++++++++++++++++++++++++++++++++++ > 3 files changed, 550 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..2bb804ccdc8e > --- /dev/null > +++ b/drivers/hwmon/tps23861.c > @@ -0,0 +1,538 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * Copyright (c) 2020 Sartura Ltd. > + * > + * Driver for the TI TPS23861 PoE PSE. > + * > + * Author: Robert Marko <robert.marko@sartura.hr> > + */ > + > +#include <linux/bitfield.h> > +#include <linux/delay.h> > +#include <linux/hwmon-sysfs.h> > +#include <linux/hwmon.h> > +#include <linux/i2c.h> > +#include <linux/module.h> > +#include <linux/of_device.h> > +#include <linux/regmap.h> > + > +#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 PORT_N_CURRENT_LSB_OFFSET 0x04 > +#define PORT_N_VOLTAGE_LSB_OFFSET 0x04 > +#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 int tps23861_read_temp(struct tps23861_data *data, long *val) > +{ > + unsigned int regval; > + int err; > + > + err = regmap_read(data->regmap, TEMPERATURE, ®val); > + if (err < 0) > + return err; > + > + *val = (regval * TEMPERATURE_LSB) - 20000; > + > + return 0; > +} > + > +static int tps23861_read_voltage(struct tps23861_data *data, int channel, > + long *val) > +{ > + unsigned int regval; > + int err; > + > + if (channel < 4) { > + err = regmap_bulk_read(data->regmap, > + PORT_1_VOLTAGE_LSB + channel * PORT_N_VOLTAGE_LSB_OFFSET, > + ®val, 2); > + } else { > + err = regmap_bulk_read(data->regmap, > + INPUT_VOLTAGE_LSB, > + ®val, 2); > + } > + if (err < 0) > + return err; > + > + *val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * VOLTAGE_LSB) / 1000; > + > + return 0; > +} > + > +static int tps23861_read_current(struct tps23861_data *data, int channel, > + long *val) > +{ > + unsigned int current_lsb; > + unsigned int regval; > + int err; > + > + if (data->shunt_resistor == SHUNT_RESISTOR_DEFAULT) > + current_lsb = CURRENT_LSB_255; > + else > + current_lsb = CURRENT_LSB_250; > + > + err = regmap_bulk_read(data->regmap, > + PORT_1_CURRENT_LSB + channel * PORT_N_CURRENT_LSB_OFFSET, > + ®val, 2); > + if (err < 0) > + return err; > + > + *val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * current_lsb) / 1000000; > + > + return 0; > +} > + > +static int tps23861_calculate_power(struct tps23861_data *data, int channel, > + long *val) > +{ > + long voltage, current_ma; > + int err; > + > + err = tps23861_read_voltage(data, channel, &voltage); > + if (err < 0) > + return err; > + > + err = tps23861_read_current(data, channel, ¤t_ma); > + if (err < 0) > + return err; > + It is not the responsibility of the kernel to calculate power values. This can and should be done in userspace. Kenrel power attributes are only appropriate if reported by the hardware. > + *val = voltage * current_ma; > + > + return 0; > +} > + > +static umode_t tps23861_is_visible(const void *data, enum hwmon_sensor_types type, > + u32 attr, int channel) > +{ > + switch (type) { > + case hwmon_temp: > + switch (attr) { > + case hwmon_temp_input: > + return 0444; default: missing. Same below. > + } > + break; > + case hwmon_in: > + switch (attr) { > + case hwmon_in_input: > + case hwmon_in_label: > + return 0444; > + } > + break; > + case hwmon_curr: > + switch (attr) { > + case hwmon_curr_input: > + case hwmon_curr_label: > + return 0444; > + } > + break; > + case hwmon_power: > + switch (attr) { > + case hwmon_power_input: > + case hwmon_power_label: > + return 0444; > + } > + break; > + default: > + break; > + } > + > + return 0; > +} > + > +static int tps23861_read(struct device *dev, enum hwmon_sensor_types type, > + u32 attr, int channel, long *val) > +{ > + struct tps23861_data *data = dev_get_drvdata(dev); > + int err; > + > + switch (type) { > + case hwmon_temp: > + switch (attr) { > + case hwmon_temp_input: > + err = tps23861_read_temp(data, val); > + break; > + default: > + return -EINVAL; return -EOPNOTSUPP; same below. > + } > + break; > + case hwmon_in: > + switch (attr) { > + case hwmon_in_input: > + err = tps23861_read_voltage(data, channel, val); > + break; > + default: > + return -EINVAL; > + } > + break; > + case hwmon_curr: > + switch (attr) { > + case hwmon_curr_input: > + err = tps23861_read_current(data, channel, val); > + break; > + default: > + return -EINVAL; > + } > + break; > + case hwmon_power: > + switch (attr) { > + case hwmon_power_input: > + err = tps23861_calculate_power(data, channel, val); > + break; > + default: > + return -EINVAL; > + } > + break; > + default: > + return -EINVAL; > + } > + > + return err; > +} > + > +static const char * const tps23861_port_label[] = { > + "Port1", > + "Port2", > + "Port3", > + "Port4", > + "Input", > +}; > + > +static int tps23861_read_string(struct device *dev, > + enum hwmon_sensor_types type, > + u32 attr, int channel, const char **str) > +{ > + switch (type) { > + case hwmon_in: > + case hwmon_curr: > + case hwmon_power: > + *str = tps23861_port_label[channel]; > + break; > + default: > + return -EOPNOTSUPP; > + } > + return 0; > +} > + > +static const struct hwmon_channel_info *tps23861_info[] = { > + HWMON_CHANNEL_INFO(chip, > + HWMON_C_REGISTER_TZ), > + HWMON_CHANNEL_INFO(temp, > + HWMON_T_INPUT), > + HWMON_CHANNEL_INFO(in, > + HWMON_I_INPUT | HWMON_I_LABEL, > + HWMON_I_INPUT | HWMON_I_LABEL, > + HWMON_I_INPUT | HWMON_I_LABEL, > + HWMON_I_INPUT | HWMON_I_LABEL, > + HWMON_I_INPUT | HWMON_I_LABEL), > + HWMON_CHANNEL_INFO(curr, > + HWMON_C_INPUT | HWMON_C_LABEL, > + HWMON_C_INPUT | HWMON_C_LABEL, > + HWMON_C_INPUT | HWMON_C_LABEL, > + HWMON_C_INPUT | HWMON_C_LABEL), > + HWMON_CHANNEL_INFO(power, > + HWMON_P_INPUT | HWMON_P_LABEL, > + HWMON_P_INPUT | HWMON_P_LABEL, > + HWMON_P_INPUT | HWMON_P_LABEL, > + HWMON_P_INPUT | HWMON_P_LABEL), > + NULL > +}; > + > +static const struct hwmon_ops tps23861_hwmon_ops = { > + .is_visible = tps23861_is_visible, > + .read = tps23861_read, > + .read_string = tps23861_read_string, > +}; > + > +static const struct hwmon_chip_info tps23861_chip_info = { > + .ops = &tps23861_hwmon_ops, > + .info = tps23861_info, > +}; > + > +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(port1_status, tps23861_port_status, PORT_1_STATUS); > +static SENSOR_DEVICE_ATTR_RO(port2_status, tps23861_port_status, PORT_2_STATUS); > +static SENSOR_DEVICE_ATTR_RO(port3_status, tps23861_port_status, PORT_3_STATUS); > +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); sysfs files are supposed to return simple values. If the above is desired/needed, I would suggest to implement debugfs attributes. > +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); > + We already have standard enable attributes. Please use those. Also, a separate 'disable' attribute is unnecessary. > +static struct attribute *tps23861_attrs[] = { > + &sensor_dev_attr_port1_status.dev_attr.attr, > + &sensor_dev_attr_port2_status.dev_attr.attr, > + &sensor_dev_attr_port3_status.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, > +}; > +__ATTRIBUTE_GROUPS(tps23861); > + > +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_info(dev, client->name, > + data, &tps23861_chip_info, > + tps23861_groups); > + return PTR_ERR_OR_ZERO(hwmon_dev); > +} > + > +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 <robert.marko@sartura.hr>"); > +MODULE_DESCRIPTION("TI TPS23861 PoE PSE"); >
On Mon, Dec 21, 2020 at 5:26 PM Guenter Roeck <linux@roeck-us.net> wrote: > > On 12/19/20 11:11 AM, Robert Marko wrote: > > Add basic monitoring support as well as port on/off control for Texas > > Instruments TPS23861 PoE PSE IC. > > > > Signed-off-by: Robert Marko <robert.marko@sartura.hr> > > Cc: Luka Perkov <luka.perkov@sartura.hr> > > --- > > Changes in v2: > > * Convert to devm_hwmon_device_register_with_info() > > * Change license > > > > drivers/hwmon/Kconfig | 11 + > > drivers/hwmon/Makefile | 1 + > > drivers/hwmon/tps23861.c | 538 +++++++++++++++++++++++++++++++++++++++ > > 3 files changed, 550 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..2bb804ccdc8e > > --- /dev/null > > +++ b/drivers/hwmon/tps23861.c > > @@ -0,0 +1,538 @@ > > +// SPDX-License-Identifier: GPL-2.0-only > > +/* > > + * Copyright (c) 2020 Sartura Ltd. > > + * > > + * Driver for the TI TPS23861 PoE PSE. > > + * > > + * Author: Robert Marko <robert.marko@sartura.hr> > > + */ > > + > > +#include <linux/bitfield.h> > > +#include <linux/delay.h> > > +#include <linux/hwmon-sysfs.h> > > +#include <linux/hwmon.h> > > +#include <linux/i2c.h> > > +#include <linux/module.h> > > +#include <linux/of_device.h> > > +#include <linux/regmap.h> > > + > > +#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 PORT_N_CURRENT_LSB_OFFSET 0x04 > > +#define PORT_N_VOLTAGE_LSB_OFFSET 0x04 > > +#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 int tps23861_read_temp(struct tps23861_data *data, long *val) > > +{ > > + unsigned int regval; > > + int err; > > + > > + err = regmap_read(data->regmap, TEMPERATURE, ®val); > > + if (err < 0) > > + return err; > > + > > + *val = (regval * TEMPERATURE_LSB) - 20000; > > + > > + return 0; > > +} > > + > > +static int tps23861_read_voltage(struct tps23861_data *data, int channel, > > + long *val) > > +{ > > + unsigned int regval; > > + int err; > > + > > + if (channel < 4) { > > + err = regmap_bulk_read(data->regmap, > > + PORT_1_VOLTAGE_LSB + channel * PORT_N_VOLTAGE_LSB_OFFSET, > > + ®val, 2); > > + } else { > > + err = regmap_bulk_read(data->regmap, > > + INPUT_VOLTAGE_LSB, > > + ®val, 2); > > + } > > + if (err < 0) > > + return err; > > + > > + *val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * VOLTAGE_LSB) / 1000; > > + > > + return 0; > > +} > > + > > +static int tps23861_read_current(struct tps23861_data *data, int channel, > > + long *val) > > +{ > > + unsigned int current_lsb; > > + unsigned int regval; > > + int err; > > + > > + if (data->shunt_resistor == SHUNT_RESISTOR_DEFAULT) > > + current_lsb = CURRENT_LSB_255; > > + else > > + current_lsb = CURRENT_LSB_250; > > + > > + err = regmap_bulk_read(data->regmap, > > + PORT_1_CURRENT_LSB + channel * PORT_N_CURRENT_LSB_OFFSET, > > + ®val, 2); > > + if (err < 0) > > + return err; > > + > > + *val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * current_lsb) / 1000000; > > + > > + return 0; > > +} > > + > > +static int tps23861_calculate_power(struct tps23861_data *data, int channel, > > + long *val) > > +{ > > + long voltage, current_ma; > > + int err; > > + > > + err = tps23861_read_voltage(data, channel, &voltage); > > + if (err < 0) > > + return err; > > + > > + err = tps23861_read_current(data, channel, ¤t_ma); > > + if (err < 0) > > + return err; > > + > > It is not the responsibility of the kernel to calculate power values. > This can and should be done in userspace. Kenrel power attributes are > only appropriate if reported by the hardware. Ok, dropped it. > > > + *val = voltage * current_ma; > > + > > + return 0; > > +} > > + > > +static umode_t tps23861_is_visible(const void *data, enum hwmon_sensor_types type, > > + u32 attr, int channel) > > +{ > > + switch (type) { > > + case hwmon_temp: > > + switch (attr) { > > + case hwmon_temp_input: > > + return 0444; > > default: missing. Same below. Added in v3. > > > + } > > + break; > > + case hwmon_in: > > + switch (attr) { > > + case hwmon_in_input: > > + case hwmon_in_label: > > + return 0444; > > + } > > + break; > > + case hwmon_curr: > > + switch (attr) { > > + case hwmon_curr_input: > > + case hwmon_curr_label: > > + return 0444; > > + } > > + break; > > + case hwmon_power: > > + switch (attr) { > > + case hwmon_power_input: > > + case hwmon_power_label: > > + return 0444; > > + } > > + break; > > + default: > > + break; > > + } > > + > > + return 0; > > +} > > + > > +static int tps23861_read(struct device *dev, enum hwmon_sensor_types type, > > + u32 attr, int channel, long *val) > > +{ > > + struct tps23861_data *data = dev_get_drvdata(dev); > > + int err; > > + > > + switch (type) { > > + case hwmon_temp: > > + switch (attr) { > > + case hwmon_temp_input: > > + err = tps23861_read_temp(data, val); > > + break; > > + default: > > + return -EINVAL; > > return -EOPNOTSUPP; > > same below. Changed in v3. > > > + } > > + break; > > + case hwmon_in: > > + switch (attr) { > > + case hwmon_in_input: > > + err = tps23861_read_voltage(data, channel, val); > > + break; > > + default: > > + return -EINVAL; > > + } > > + break; > > + case hwmon_curr: > > + switch (attr) { > > + case hwmon_curr_input: > > + err = tps23861_read_current(data, channel, val); > > + break; > > + default: > > + return -EINVAL; > > + } > > + break; > > + case hwmon_power: > > + switch (attr) { > > + case hwmon_power_input: > > + err = tps23861_calculate_power(data, channel, val); > > + break; > > + default: > > + return -EINVAL; > > + } > > + break; > > + default: > > + return -EINVAL; > > + } > > + > > + return err; > > +} > > + > > +static const char * const tps23861_port_label[] = { > > + "Port1", > > + "Port2", > > + "Port3", > > + "Port4", > > + "Input", > > +}; > > + > > +static int tps23861_read_string(struct device *dev, > > + enum hwmon_sensor_types type, > > + u32 attr, int channel, const char **str) > > +{ > > + switch (type) { > > + case hwmon_in: > > + case hwmon_curr: > > + case hwmon_power: > > + *str = tps23861_port_label[channel]; > > + break; > > + default: > > + return -EOPNOTSUPP; > > + } > > + return 0; > > +} > > + > > +static const struct hwmon_channel_info *tps23861_info[] = { > > + HWMON_CHANNEL_INFO(chip, > > + HWMON_C_REGISTER_TZ), > > + HWMON_CHANNEL_INFO(temp, > > + HWMON_T_INPUT), > > + HWMON_CHANNEL_INFO(in, > > + HWMON_I_INPUT | HWMON_I_LABEL, > > + HWMON_I_INPUT | HWMON_I_LABEL, > > + HWMON_I_INPUT | HWMON_I_LABEL, > > + HWMON_I_INPUT | HWMON_I_LABEL, > > + HWMON_I_INPUT | HWMON_I_LABEL), > > + HWMON_CHANNEL_INFO(curr, > > + HWMON_C_INPUT | HWMON_C_LABEL, > > + HWMON_C_INPUT | HWMON_C_LABEL, > > + HWMON_C_INPUT | HWMON_C_LABEL, > > + HWMON_C_INPUT | HWMON_C_LABEL), > > + HWMON_CHANNEL_INFO(power, > > + HWMON_P_INPUT | HWMON_P_LABEL, > > + HWMON_P_INPUT | HWMON_P_LABEL, > > + HWMON_P_INPUT | HWMON_P_LABEL, > > + HWMON_P_INPUT | HWMON_P_LABEL), > > + NULL > > +}; > > + > > +static const struct hwmon_ops tps23861_hwmon_ops = { > > + .is_visible = tps23861_is_visible, > > + .read = tps23861_read, > > + .read_string = tps23861_read_string, > > +}; > > + > > +static const struct hwmon_chip_info tps23861_chip_info = { > > + .ops = &tps23861_hwmon_ops, > > + .info = tps23861_info, > > +}; > > + > > +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(port1_status, tps23861_port_status, PORT_1_STATUS); > > +static SENSOR_DEVICE_ATTR_RO(port2_status, tps23861_port_status, PORT_2_STATUS); > > +static SENSOR_DEVICE_ATTR_RO(port3_status, tps23861_port_status, PORT_3_STATUS); > > +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); > > sysfs files are supposed to return simple values. If the above is desired/needed, > I would suggest to implement debugfs attributes. Ok, moved these to debugfs. > > > +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); > > + > > We already have standard enable attributes. Please use those. > Also, a separate 'disable' attribute is unnecessary. Ok, implemented enable/disable using hwmon_in_enable in v3. Regards, Robert > > > +static struct attribute *tps23861_attrs[] = { > > + &sensor_dev_attr_port1_status.dev_attr.attr, > > + &sensor_dev_attr_port2_status.dev_attr.attr, > > + &sensor_dev_attr_port3_status.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, > > +}; > > +__ATTRIBUTE_GROUPS(tps23861); > > + > > +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_info(dev, client->name, > > + data, &tps23861_chip_info, > > + tps23861_groups); > > + return PTR_ERR_OR_ZERO(hwmon_dev); > > +} > > + > > +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 <robert.marko@sartura.hr>"); > > +MODULE_DESCRIPTION("TI TPS23861 PoE PSE"); > > >
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..2bb804ccdc8e --- /dev/null +++ b/drivers/hwmon/tps23861.c @@ -0,0 +1,538 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2020 Sartura Ltd. + * + * Driver for the TI TPS23861 PoE PSE. + * + * Author: Robert Marko <robert.marko@sartura.hr> + */ + +#include <linux/bitfield.h> +#include <linux/delay.h> +#include <linux/hwmon-sysfs.h> +#include <linux/hwmon.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/of_device.h> +#include <linux/regmap.h> + +#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 PORT_N_CURRENT_LSB_OFFSET 0x04 +#define PORT_N_VOLTAGE_LSB_OFFSET 0x04 +#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 int tps23861_read_temp(struct tps23861_data *data, long *val) +{ + unsigned int regval; + int err; + + err = regmap_read(data->regmap, TEMPERATURE, ®val); + if (err < 0) + return err; + + *val = (regval * TEMPERATURE_LSB) - 20000; + + return 0; +} + +static int tps23861_read_voltage(struct tps23861_data *data, int channel, + long *val) +{ + unsigned int regval; + int err; + + if (channel < 4) { + err = regmap_bulk_read(data->regmap, + PORT_1_VOLTAGE_LSB + channel * PORT_N_VOLTAGE_LSB_OFFSET, + ®val, 2); + } else { + err = regmap_bulk_read(data->regmap, + INPUT_VOLTAGE_LSB, + ®val, 2); + } + if (err < 0) + return err; + + *val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * VOLTAGE_LSB) / 1000; + + return 0; +} + +static int tps23861_read_current(struct tps23861_data *data, int channel, + long *val) +{ + unsigned int current_lsb; + unsigned int regval; + int err; + + if (data->shunt_resistor == SHUNT_RESISTOR_DEFAULT) + current_lsb = CURRENT_LSB_255; + else + current_lsb = CURRENT_LSB_250; + + err = regmap_bulk_read(data->regmap, + PORT_1_CURRENT_LSB + channel * PORT_N_CURRENT_LSB_OFFSET, + ®val, 2); + if (err < 0) + return err; + + *val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * current_lsb) / 1000000; + + return 0; +} + +static int tps23861_calculate_power(struct tps23861_data *data, int channel, + long *val) +{ + long voltage, current_ma; + int err; + + err = tps23861_read_voltage(data, channel, &voltage); + if (err < 0) + return err; + + err = tps23861_read_current(data, channel, ¤t_ma); + if (err < 0) + return err; + + *val = voltage * current_ma; + + return 0; +} + +static umode_t tps23861_is_visible(const void *data, enum hwmon_sensor_types type, + u32 attr, int channel) +{ + switch (type) { + case hwmon_temp: + switch (attr) { + case hwmon_temp_input: + return 0444; + } + break; + case hwmon_in: + switch (attr) { + case hwmon_in_input: + case hwmon_in_label: + return 0444; + } + break; + case hwmon_curr: + switch (attr) { + case hwmon_curr_input: + case hwmon_curr_label: + return 0444; + } + break; + case hwmon_power: + switch (attr) { + case hwmon_power_input: + case hwmon_power_label: + return 0444; + } + break; + default: + break; + } + + return 0; +} + +static int tps23861_read(struct device *dev, enum hwmon_sensor_types type, + u32 attr, int channel, long *val) +{ + struct tps23861_data *data = dev_get_drvdata(dev); + int err; + + switch (type) { + case hwmon_temp: + switch (attr) { + case hwmon_temp_input: + err = tps23861_read_temp(data, val); + break; + default: + return -EINVAL; + } + break; + case hwmon_in: + switch (attr) { + case hwmon_in_input: + err = tps23861_read_voltage(data, channel, val); + break; + default: + return -EINVAL; + } + break; + case hwmon_curr: + switch (attr) { + case hwmon_curr_input: + err = tps23861_read_current(data, channel, val); + break; + default: + return -EINVAL; + } + break; + case hwmon_power: + switch (attr) { + case hwmon_power_input: + err = tps23861_calculate_power(data, channel, val); + break; + default: + return -EINVAL; + } + break; + default: + return -EINVAL; + } + + return err; +} + +static const char * const tps23861_port_label[] = { + "Port1", + "Port2", + "Port3", + "Port4", + "Input", +}; + +static int tps23861_read_string(struct device *dev, + enum hwmon_sensor_types type, + u32 attr, int channel, const char **str) +{ + switch (type) { + case hwmon_in: + case hwmon_curr: + case hwmon_power: + *str = tps23861_port_label[channel]; + break; + default: + return -EOPNOTSUPP; + } + return 0; +} + +static const struct hwmon_channel_info *tps23861_info[] = { + HWMON_CHANNEL_INFO(chip, + HWMON_C_REGISTER_TZ), + HWMON_CHANNEL_INFO(temp, + HWMON_T_INPUT), + HWMON_CHANNEL_INFO(in, + HWMON_I_INPUT | HWMON_I_LABEL, + HWMON_I_INPUT | HWMON_I_LABEL, + HWMON_I_INPUT | HWMON_I_LABEL, + HWMON_I_INPUT | HWMON_I_LABEL, + HWMON_I_INPUT | HWMON_I_LABEL), + HWMON_CHANNEL_INFO(curr, + HWMON_C_INPUT | HWMON_C_LABEL, + HWMON_C_INPUT | HWMON_C_LABEL, + HWMON_C_INPUT | HWMON_C_LABEL, + HWMON_C_INPUT | HWMON_C_LABEL), + HWMON_CHANNEL_INFO(power, + HWMON_P_INPUT | HWMON_P_LABEL, + HWMON_P_INPUT | HWMON_P_LABEL, + HWMON_P_INPUT | HWMON_P_LABEL, + HWMON_P_INPUT | HWMON_P_LABEL), + NULL +}; + +static const struct hwmon_ops tps23861_hwmon_ops = { + .is_visible = tps23861_is_visible, + .read = tps23861_read, + .read_string = tps23861_read_string, +}; + +static const struct hwmon_chip_info tps23861_chip_info = { + .ops = &tps23861_hwmon_ops, + .info = tps23861_info, +}; + +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(port1_status, tps23861_port_status, PORT_1_STATUS); +static SENSOR_DEVICE_ATTR_RO(port2_status, tps23861_port_status, PORT_2_STATUS); +static SENSOR_DEVICE_ATTR_RO(port3_status, tps23861_port_status, PORT_3_STATUS); +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_port1_status.dev_attr.attr, + &sensor_dev_attr_port2_status.dev_attr.attr, + &sensor_dev_attr_port3_status.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, +}; +__ATTRIBUTE_GROUPS(tps23861); + +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_info(dev, client->name, + data, &tps23861_chip_info, + tps23861_groups); + return PTR_ERR_OR_ZERO(hwmon_dev); +} + +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 <robert.marko@sartura.hr>"); +MODULE_DESCRIPTION("TI TPS23861 PoE PSE");
Add basic monitoring support as well as port on/off control for Texas Instruments TPS23861 PoE PSE IC. Signed-off-by: Robert Marko <robert.marko@sartura.hr> Cc: Luka Perkov <luka.perkov@sartura.hr> --- Changes in v2: * Convert to devm_hwmon_device_register_with_info() * Change license drivers/hwmon/Kconfig | 11 + drivers/hwmon/Makefile | 1 + drivers/hwmon/tps23861.c | 538 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 550 insertions(+) create mode 100644 drivers/hwmon/tps23861.c