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e13d112724
Current shunt LSB values got reversed during in the
original driver commit.
So, correct the current shunt LSB values according to
the datasheet.
This caused reading slightly skewed current values.
Fixes: fff7b8ab22 ("hwmon: add Texas Instruments TPS23861 driver")
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Link: https://lore.kernel.org/r/20210609220728.499879-3-robert.marko@sartura.hr
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
615 lines
15 KiB
C
615 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2020 Sartura Ltd.
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*
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* Driver for the TI TPS23861 PoE PSE.
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*
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* Author: Robert Marko <robert.marko@sartura.hr>
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*/
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#include <linux/bitfield.h>
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#include <linux/debugfs.h>
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#include <linux/delay.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/hwmon.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/regmap.h>
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#define TEMPERATURE 0x2c
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#define INPUT_VOLTAGE_LSB 0x2e
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#define INPUT_VOLTAGE_MSB 0x2f
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#define PORT_1_CURRENT_LSB 0x30
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#define PORT_1_CURRENT_MSB 0x31
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#define PORT_1_VOLTAGE_LSB 0x32
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#define PORT_1_VOLTAGE_MSB 0x33
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#define PORT_2_CURRENT_LSB 0x34
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#define PORT_2_CURRENT_MSB 0x35
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#define PORT_2_VOLTAGE_LSB 0x36
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#define PORT_2_VOLTAGE_MSB 0x37
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#define PORT_3_CURRENT_LSB 0x38
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#define PORT_3_CURRENT_MSB 0x39
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#define PORT_3_VOLTAGE_LSB 0x3a
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#define PORT_3_VOLTAGE_MSB 0x3b
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#define PORT_4_CURRENT_LSB 0x3c
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#define PORT_4_CURRENT_MSB 0x3d
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#define PORT_4_VOLTAGE_LSB 0x3e
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#define PORT_4_VOLTAGE_MSB 0x3f
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#define PORT_N_CURRENT_LSB_OFFSET 0x04
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#define PORT_N_VOLTAGE_LSB_OFFSET 0x04
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#define VOLTAGE_CURRENT_MASK GENMASK(13, 0)
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#define PORT_1_RESISTANCE_LSB 0x60
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#define PORT_1_RESISTANCE_MSB 0x61
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#define PORT_2_RESISTANCE_LSB 0x62
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#define PORT_2_RESISTANCE_MSB 0x63
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#define PORT_3_RESISTANCE_LSB 0x64
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#define PORT_3_RESISTANCE_MSB 0x65
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#define PORT_4_RESISTANCE_LSB 0x66
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#define PORT_4_RESISTANCE_MSB 0x67
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#define PORT_N_RESISTANCE_LSB_OFFSET 0x02
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#define PORT_RESISTANCE_MASK GENMASK(13, 0)
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#define PORT_RESISTANCE_RSN_MASK GENMASK(15, 14)
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#define PORT_RESISTANCE_RSN_OTHER 0
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#define PORT_RESISTANCE_RSN_LOW 1
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#define PORT_RESISTANCE_RSN_OPEN 2
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#define PORT_RESISTANCE_RSN_SHORT 3
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#define PORT_1_STATUS 0x0c
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#define PORT_2_STATUS 0x0d
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#define PORT_3_STATUS 0x0e
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#define PORT_4_STATUS 0x0f
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#define PORT_STATUS_CLASS_MASK GENMASK(7, 4)
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#define PORT_STATUS_DETECT_MASK GENMASK(3, 0)
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#define PORT_CLASS_UNKNOWN 0
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#define PORT_CLASS_1 1
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#define PORT_CLASS_2 2
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#define PORT_CLASS_3 3
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#define PORT_CLASS_4 4
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#define PORT_CLASS_RESERVED 5
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#define PORT_CLASS_0 6
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#define PORT_CLASS_OVERCURRENT 7
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#define PORT_CLASS_MISMATCH 8
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#define PORT_DETECT_UNKNOWN 0
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#define PORT_DETECT_SHORT 1
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#define PORT_DETECT_RESERVED 2
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#define PORT_DETECT_RESISTANCE_LOW 3
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#define PORT_DETECT_RESISTANCE_OK 4
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#define PORT_DETECT_RESISTANCE_HIGH 5
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#define PORT_DETECT_OPEN_CIRCUIT 6
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#define PORT_DETECT_RESERVED_2 7
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#define PORT_DETECT_MOSFET_FAULT 8
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#define PORT_DETECT_LEGACY 9
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/* Measurment beyond clamp voltage */
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#define PORT_DETECT_CAPACITANCE_INVALID_BEYOND 10
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/* Insufficient voltage delta */
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#define PORT_DETECT_CAPACITANCE_INVALID_DELTA 11
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#define PORT_DETECT_CAPACITANCE_OUT_OF_RANGE 12
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#define POE_PLUS 0x40
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#define OPERATING_MODE 0x12
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#define OPERATING_MODE_OFF 0
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#define OPERATING_MODE_MANUAL 1
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#define OPERATING_MODE_SEMI 2
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#define OPERATING_MODE_AUTO 3
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#define OPERATING_MODE_PORT_1_MASK GENMASK(1, 0)
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#define OPERATING_MODE_PORT_2_MASK GENMASK(3, 2)
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#define OPERATING_MODE_PORT_3_MASK GENMASK(5, 4)
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#define OPERATING_MODE_PORT_4_MASK GENMASK(7, 6)
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#define DETECT_CLASS_RESTART 0x18
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#define POWER_ENABLE 0x19
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#define TPS23861_NUM_PORTS 4
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#define TPS23861_GENERAL_MASK_1 0x17
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#define TPS23861_CURRENT_SHUNT_MASK BIT(0)
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#define TEMPERATURE_LSB 652 /* 0.652 degrees Celsius */
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#define VOLTAGE_LSB 3662 /* 3.662 mV */
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#define SHUNT_RESISTOR_DEFAULT 255000 /* 255 mOhm */
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#define CURRENT_LSB_250 62260 /* 62.260 uA */
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#define CURRENT_LSB_255 61039 /* 61.039 uA */
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#define RESISTANCE_LSB 110966 /* 11.0966 Ohm*/
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#define RESISTANCE_LSB_LOW 157216 /* 15.7216 Ohm*/
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struct tps23861_data {
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struct regmap *regmap;
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u32 shunt_resistor;
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struct i2c_client *client;
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struct dentry *debugfs_dir;
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};
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static struct regmap_config tps23861_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.max_register = 0x6f,
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};
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static int tps23861_read_temp(struct tps23861_data *data, long *val)
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{
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unsigned int regval;
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int err;
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err = regmap_read(data->regmap, TEMPERATURE, ®val);
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if (err < 0)
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return err;
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*val = (regval * TEMPERATURE_LSB) - 20000;
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return 0;
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}
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static int tps23861_read_voltage(struct tps23861_data *data, int channel,
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long *val)
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{
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unsigned int regval;
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int err;
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if (channel < TPS23861_NUM_PORTS) {
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err = regmap_bulk_read(data->regmap,
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PORT_1_VOLTAGE_LSB + channel * PORT_N_VOLTAGE_LSB_OFFSET,
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®val, 2);
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} else {
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err = regmap_bulk_read(data->regmap,
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INPUT_VOLTAGE_LSB,
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®val, 2);
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}
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if (err < 0)
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return err;
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*val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * VOLTAGE_LSB) / 1000;
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return 0;
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}
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static int tps23861_read_current(struct tps23861_data *data, int channel,
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long *val)
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{
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unsigned int current_lsb;
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unsigned int regval;
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int err;
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if (data->shunt_resistor == SHUNT_RESISTOR_DEFAULT)
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current_lsb = CURRENT_LSB_255;
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else
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current_lsb = CURRENT_LSB_250;
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err = regmap_bulk_read(data->regmap,
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PORT_1_CURRENT_LSB + channel * PORT_N_CURRENT_LSB_OFFSET,
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®val, 2);
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if (err < 0)
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return err;
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*val = (FIELD_GET(VOLTAGE_CURRENT_MASK, regval) * current_lsb) / 1000000;
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return 0;
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}
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static int tps23861_port_disable(struct tps23861_data *data, int channel)
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{
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unsigned int regval = 0;
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int err;
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regval |= BIT(channel + 4);
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err = regmap_write(data->regmap, POWER_ENABLE, regval);
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return err;
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}
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static int tps23861_port_enable(struct tps23861_data *data, int channel)
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{
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unsigned int regval = 0;
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int err;
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regval |= BIT(channel);
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regval |= BIT(channel + 4);
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err = regmap_write(data->regmap, DETECT_CLASS_RESTART, regval);
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return err;
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}
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static umode_t tps23861_is_visible(const void *data, enum hwmon_sensor_types type,
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u32 attr, int channel)
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{
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switch (type) {
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case hwmon_temp:
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switch (attr) {
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case hwmon_temp_input:
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case hwmon_temp_label:
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return 0444;
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default:
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return 0;
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}
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case hwmon_in:
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switch (attr) {
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case hwmon_in_input:
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case hwmon_in_label:
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return 0444;
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case hwmon_in_enable:
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return 0200;
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default:
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return 0;
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}
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case hwmon_curr:
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switch (attr) {
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case hwmon_curr_input:
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case hwmon_curr_label:
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return 0444;
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default:
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return 0;
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}
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default:
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return 0;
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}
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}
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static int tps23861_write(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long val)
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{
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struct tps23861_data *data = dev_get_drvdata(dev);
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int err;
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switch (type) {
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case hwmon_in:
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switch (attr) {
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case hwmon_in_enable:
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if (val == 0)
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err = tps23861_port_disable(data, channel);
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else if (val == 1)
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err = tps23861_port_enable(data, channel);
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else
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err = -EINVAL;
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break;
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default:
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return -EOPNOTSUPP;
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}
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break;
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default:
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return -EOPNOTSUPP;
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}
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return err;
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}
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static int tps23861_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long *val)
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{
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struct tps23861_data *data = dev_get_drvdata(dev);
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int err;
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switch (type) {
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case hwmon_temp:
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switch (attr) {
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case hwmon_temp_input:
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err = tps23861_read_temp(data, val);
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break;
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default:
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return -EOPNOTSUPP;
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}
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break;
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case hwmon_in:
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switch (attr) {
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case hwmon_in_input:
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err = tps23861_read_voltage(data, channel, val);
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break;
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default:
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return -EOPNOTSUPP;
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}
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break;
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case hwmon_curr:
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switch (attr) {
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case hwmon_curr_input:
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err = tps23861_read_current(data, channel, val);
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break;
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default:
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return -EOPNOTSUPP;
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}
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break;
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default:
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return -EOPNOTSUPP;
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}
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return err;
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}
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static const char * const tps23861_port_label[] = {
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"Port1",
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"Port2",
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"Port3",
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"Port4",
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"Input",
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};
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static int tps23861_read_string(struct device *dev,
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enum hwmon_sensor_types type,
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u32 attr, int channel, const char **str)
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{
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switch (type) {
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case hwmon_in:
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case hwmon_curr:
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*str = tps23861_port_label[channel];
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break;
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case hwmon_temp:
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*str = "Die";
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break;
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default:
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static const struct hwmon_channel_info *tps23861_info[] = {
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HWMON_CHANNEL_INFO(chip,
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HWMON_C_REGISTER_TZ),
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HWMON_CHANNEL_INFO(temp,
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HWMON_T_INPUT | HWMON_T_LABEL),
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HWMON_CHANNEL_INFO(in,
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HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_ENABLE | HWMON_I_LABEL,
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HWMON_I_INPUT | HWMON_I_LABEL),
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HWMON_CHANNEL_INFO(curr,
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HWMON_C_INPUT | HWMON_C_LABEL,
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HWMON_C_INPUT | HWMON_C_LABEL,
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HWMON_C_INPUT | HWMON_C_LABEL,
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HWMON_C_INPUT | HWMON_C_LABEL),
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NULL
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};
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static const struct hwmon_ops tps23861_hwmon_ops = {
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.is_visible = tps23861_is_visible,
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.write = tps23861_write,
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.read = tps23861_read,
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.read_string = tps23861_read_string,
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};
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static const struct hwmon_chip_info tps23861_chip_info = {
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.ops = &tps23861_hwmon_ops,
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.info = tps23861_info,
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};
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static char *tps23861_port_operating_mode(struct tps23861_data *data, int port)
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{
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unsigned int regval;
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int mode;
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regmap_read(data->regmap, OPERATING_MODE, ®val);
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switch (port) {
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case 1:
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mode = FIELD_GET(OPERATING_MODE_PORT_1_MASK, regval);
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break;
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case 2:
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mode = FIELD_GET(OPERATING_MODE_PORT_2_MASK, regval);
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break;
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case 3:
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mode = FIELD_GET(OPERATING_MODE_PORT_3_MASK, regval);
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break;
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case 4:
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mode = FIELD_GET(OPERATING_MODE_PORT_4_MASK, regval);
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break;
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default:
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mode = -EINVAL;
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}
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switch (mode) {
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case OPERATING_MODE_OFF:
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return "Off";
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case OPERATING_MODE_MANUAL:
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return "Manual";
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case OPERATING_MODE_SEMI:
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return "Semi-Auto";
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case OPERATING_MODE_AUTO:
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return "Auto";
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default:
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return "Invalid";
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}
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}
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static char *tps23861_port_detect_status(struct tps23861_data *data, int port)
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{
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unsigned int regval;
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regmap_read(data->regmap,
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PORT_1_STATUS + (port - 1),
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®val);
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switch (FIELD_GET(PORT_STATUS_DETECT_MASK, regval)) {
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case PORT_DETECT_UNKNOWN:
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return "Unknown device";
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case PORT_DETECT_SHORT:
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return "Short circuit";
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case PORT_DETECT_RESISTANCE_LOW:
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return "Too low resistance";
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case PORT_DETECT_RESISTANCE_OK:
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return "Valid resistance";
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case PORT_DETECT_RESISTANCE_HIGH:
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return "Too high resistance";
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case PORT_DETECT_OPEN_CIRCUIT:
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return "Open circuit";
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case PORT_DETECT_MOSFET_FAULT:
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return "MOSFET fault";
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case PORT_DETECT_LEGACY:
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return "Legacy device";
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case PORT_DETECT_CAPACITANCE_INVALID_BEYOND:
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return "Invalid capacitance, beyond clamp voltage";
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case PORT_DETECT_CAPACITANCE_INVALID_DELTA:
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return "Invalid capacitance, insufficient voltage delta";
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case PORT_DETECT_CAPACITANCE_OUT_OF_RANGE:
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return "Valid capacitance, outside of legacy range";
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case PORT_DETECT_RESERVED:
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case PORT_DETECT_RESERVED_2:
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default:
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return "Invalid";
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}
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}
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static char *tps23861_port_class_status(struct tps23861_data *data, int port)
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{
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unsigned int regval;
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regmap_read(data->regmap,
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PORT_1_STATUS + (port - 1),
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®val);
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switch (FIELD_GET(PORT_STATUS_CLASS_MASK, regval)) {
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case PORT_CLASS_UNKNOWN:
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return "Unknown";
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case PORT_CLASS_RESERVED:
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case PORT_CLASS_0:
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return "0";
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case PORT_CLASS_1:
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return "1";
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case PORT_CLASS_2:
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return "2";
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case PORT_CLASS_3:
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return "3";
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case PORT_CLASS_4:
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return "4";
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case PORT_CLASS_OVERCURRENT:
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return "Overcurrent";
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case PORT_CLASS_MISMATCH:
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return "Mismatch";
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default:
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return "Invalid";
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}
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}
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static char *tps23861_port_poe_plus_status(struct tps23861_data *data, int port)
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{
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unsigned int regval;
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regmap_read(data->regmap, POE_PLUS, ®val);
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if (BIT(port + 3) & regval)
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return "Yes";
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else
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return "No";
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}
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static int tps23861_port_resistance(struct tps23861_data *data, int port)
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{
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u16 regval;
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regmap_bulk_read(data->regmap,
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PORT_1_RESISTANCE_LSB + PORT_N_RESISTANCE_LSB_OFFSET * (port - 1),
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®val,
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2);
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switch (FIELD_GET(PORT_RESISTANCE_RSN_MASK, regval)) {
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case PORT_RESISTANCE_RSN_OTHER:
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return (FIELD_GET(PORT_RESISTANCE_MASK, regval) * RESISTANCE_LSB) / 10000;
|
|
case PORT_RESISTANCE_RSN_LOW:
|
|
return (FIELD_GET(PORT_RESISTANCE_MASK, regval) * RESISTANCE_LSB_LOW) / 10000;
|
|
case PORT_RESISTANCE_RSN_SHORT:
|
|
case PORT_RESISTANCE_RSN_OPEN:
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
static int tps23861_port_status_show(struct seq_file *s, void *data)
|
|
{
|
|
struct tps23861_data *priv = s->private;
|
|
int i;
|
|
|
|
for (i = 1; i < TPS23861_NUM_PORTS + 1; i++) {
|
|
seq_printf(s, "Port: \t\t%d\n", i);
|
|
seq_printf(s, "Operating mode: %s\n", tps23861_port_operating_mode(priv, i));
|
|
seq_printf(s, "Detected: \t%s\n", tps23861_port_detect_status(priv, i));
|
|
seq_printf(s, "Class: \t\t%s\n", tps23861_port_class_status(priv, i));
|
|
seq_printf(s, "PoE Plus: \t%s\n", tps23861_port_poe_plus_status(priv, i));
|
|
seq_printf(s, "Resistance: \t%d\n", tps23861_port_resistance(priv, i));
|
|
seq_putc(s, '\n');
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
DEFINE_SHOW_ATTRIBUTE(tps23861_port_status);
|
|
|
|
static void tps23861_init_debugfs(struct tps23861_data *data)
|
|
{
|
|
data->debugfs_dir = debugfs_create_dir(data->client->name, NULL);
|
|
|
|
debugfs_create_file("port_status",
|
|
0400,
|
|
data->debugfs_dir,
|
|
data,
|
|
&tps23861_port_status_fops);
|
|
}
|
|
|
|
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->client = client;
|
|
i2c_set_clientdata(client, data);
|
|
|
|
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))
|
|
data->shunt_resistor = shunt_resistor;
|
|
else
|
|
data->shunt_resistor = SHUNT_RESISTOR_DEFAULT;
|
|
|
|
if (data->shunt_resistor == SHUNT_RESISTOR_DEFAULT)
|
|
regmap_clear_bits(data->regmap,
|
|
TPS23861_GENERAL_MASK_1,
|
|
TPS23861_CURRENT_SHUNT_MASK);
|
|
else
|
|
regmap_set_bits(data->regmap,
|
|
TPS23861_GENERAL_MASK_1,
|
|
TPS23861_CURRENT_SHUNT_MASK);
|
|
|
|
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
|
|
data, &tps23861_chip_info,
|
|
NULL);
|
|
if (IS_ERR(hwmon_dev))
|
|
return PTR_ERR(hwmon_dev);
|
|
|
|
tps23861_init_debugfs(data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tps23861_remove(struct i2c_client *client)
|
|
{
|
|
struct tps23861_data *data = i2c_get_clientdata(client);
|
|
|
|
debugfs_remove_recursive(data->debugfs_dir);
|
|
|
|
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,
|
|
.remove = tps23861_remove,
|
|
.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");
|