Add support for the the INA3221 26v capable, Triple channel, Bi-Directional, Zero-Drift, Low-/High-Side, Current/Voltage Monitor with I2C interface. Signed-off-by: Andrew F. Davis <afd@xxxxxx> --- Documentation/hwmon/ina3221 | 32 ++++ drivers/hwmon/Kconfig | 11 ++ drivers/hwmon/Makefile | 1 + drivers/hwmon/ina3221.c | 398 ++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 442 insertions(+) create mode 100644 Documentation/hwmon/ina3221 create mode 100644 drivers/hwmon/ina3221.c diff --git a/Documentation/hwmon/ina3221 b/Documentation/hwmon/ina3221 new file mode 100644 index 0000000..3de3814 --- /dev/null +++ b/Documentation/hwmon/ina3221 @@ -0,0 +1,32 @@ +Kernel driver ina3221 +===================== + +Supported chips: + * Texas Instruments INA3221 + Prefix: 'ina3221' + Addresses: I2C 0x40 - 0x43 + Datasheet: Publicly available at the Texas Instruments website + http://www.ti.com/ + +Author: Andrew F. Davis <afd@xxxxxx> + +Description +----------- + +The Texas Instruments INA3221 monitors voltage, current, and power on the high +side of up to three D.C. power supplies. The INA3221 monitors both shunt drop +and supply voltage, with programmable conversion times and averaging, current +and power are calculated host-side from these. + +Sysfs entries +------------- + +in[012]_input Bus voltages(mV) for channels 1, 2, and 3 respectively +in[345]_input Shunt voltages(mV) for channels 1, 2, and 3 respectively +curr[012]_input Current(mA) measurement for channels 1, 2, and 3 respectively +power[012]_input Power(uW) measurement for channels 1, 2, and 3 respectively +shunt[012]_resistor Shunt resistance(uOhm) for channels 1, 2, and 3 respectively +critical[012]_alarm Critical alert voltage(mV) setting, activated when the + respective shunt voltage is above this value. +warning[012]_alarm Warning alert voltage(mV) setting, activated when the + respective shunt voltage average is above this value. diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 5c2d13a..de08242 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1503,6 +1503,17 @@ config SENSORS_INA2XX This driver can also be built as a module. If so, the module will be called ina2xx. +config SENSORS_INA3221 + tristate "Texas Instruments INA3221 Triple Power Monitor" + depends on I2C + select REGMAP_I2C + help + If you say yes here you get support for the TI INA3221 Triple Power + Monitor. + + This driver can also be built as a module. If so, the module + will be called ina3221. + config SENSORS_TC74 tristate "Microchip TC74" depends on I2C diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 58cc3ac..83e8ab0 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -77,6 +77,7 @@ obj-$(CONFIG_SENSORS_IBMPOWERNV)+= ibmpowernv.o obj-$(CONFIG_SENSORS_IIO_HWMON) += iio_hwmon.o obj-$(CONFIG_SENSORS_INA209) += ina209.o obj-$(CONFIG_SENSORS_INA2XX) += ina2xx.o +obj-$(CONFIG_SENSORS_INA3221) += ina3221.o obj-$(CONFIG_SENSORS_IT87) += it87.o obj-$(CONFIG_SENSORS_JC42) += jc42.o obj-$(CONFIG_SENSORS_JZ4740) += jz4740-hwmon.o diff --git a/drivers/hwmon/ina3221.c b/drivers/hwmon/ina3221.c new file mode 100644 index 0000000..763e23b --- /dev/null +++ b/drivers/hwmon/ina3221.c @@ -0,0 +1,398 @@ +/* + * INA3221 Triple Current/Voltage Monitor + * + * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/ + * Andrew F. Davis <afd@xxxxxx> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + */ + +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/regmap.h> + +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> + +#define INA3221_DRIVER_NAME "ina3221" + +#define INA3221_CONFIG 0x00 +#define INA3221_SHUNT1 0x01 +#define INA3221_BUS1 0x02 +#define INA3221_SHUNT2 0x03 +#define INA3221_BUS2 0x04 +#define INA3221_SHUNT3 0x05 +#define INA3221_BUS3 0x06 +#define INA3221_CRIT1 0x07 +#define INA3221_WARN1 0x08 +#define INA3221_CRIT2 0x09 +#define INA3221_WARN2 0x0a +#define INA3221_CRIT3 0x0b +#define INA3221_WARN3 0x0c +#define INA3221_SHUNT_SUM 0x0d +#define INA3221_SHUNT_SUM_LIMIT 0x0e +#define INA3221_MASK_ENABLE 0x0f +#define INA3221_POWERV_HLIMIT 0x10 +#define INA3221_POWERV_LLIMIT 0x11 + +#define INA3221_CONFIG_MODE_SHUNT BIT(1) +#define INA3221_CONFIG_MODE_BUS BIT(2) +#define INA3221_CONFIG_MODE_CONTINUOUS BIT(3) + +enum ina3221_fields { + /* Configuration */ + F_MODE, F_SHUNT_CT, F_BUS_CT, F_AVG, + F_CHAN3_EN, F_CHAN2_EN, F_CHAN1_EN, F_RST, + + /* sentinel */ + F_MAX_FIELDS +}; + +static const struct reg_field ina3221_reg_fields[] = { + [F_MODE] = REG_FIELD(INA3221_CONFIG, 0, 2), + [F_SHUNT_CT] = REG_FIELD(INA3221_CONFIG, 3, 5), + [F_BUS_CT] = REG_FIELD(INA3221_CONFIG, 6, 8), + [F_AVG] = REG_FIELD(INA3221_CONFIG, 9, 11), + [F_CHAN3_EN] = REG_FIELD(INA3221_CONFIG, 12, 12), + [F_CHAN2_EN] = REG_FIELD(INA3221_CONFIG, 13, 13), + [F_CHAN1_EN] = REG_FIELD(INA3221_CONFIG, 14, 14), + [F_RST] = REG_FIELD(INA3221_CONFIG, 15, 15), +}; + +enum ina3221_channels { + INA3221_CHANNEL1, + INA3221_CHANNEL2, + INA3221_CHANNEL3, + INA3221_NUM_CHANNELS +}; + +static const int shunt_registers[] = { + [INA3221_CHANNEL1] = INA3221_SHUNT1, + [INA3221_CHANNEL2] = INA3221_SHUNT2, + [INA3221_CHANNEL3] = INA3221_SHUNT3, +}; + +static const int bus_registers[] = { + [INA3221_CHANNEL1] = INA3221_BUS1, + [INA3221_CHANNEL2] = INA3221_BUS2, + [INA3221_CHANNEL3] = INA3221_BUS3, +}; + +/** + * struct ina3221_data - device specific information + * @dev: Device structure + * @regmap: Register map of the device + * @fields: Register fields of the device + */ +struct ina3221_data { + struct device *dev; + struct regmap *regmap; + struct regmap_field *fields[F_MAX_FIELDS]; + unsigned int shunt_resistors[INA3221_NUM_CHANNELS]; +}; + +static int ina3221_read_value(struct ina3221_data *ina, unsigned int reg, + unsigned int *val) +{ + unsigned int regval; + int ret; + + ret = regmap_read(ina->regmap, reg, ®val); + if (ret) + return ret; + + *val = sign_extend32(regval >> 3, 12); + + return 0; +} + +static ssize_t ina3221_show_voltage(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr); + struct ina3221_data *ina = dev_get_drvdata(dev); + unsigned int reg = sd_attr->index; + int val, voltage_mv, ret; + + ret = ina3221_read_value(ina, reg, &val); + if (ret) + return ret; + + if (reg == INA3221_BUS1 || + reg == INA3221_BUS2 || + reg == INA3221_BUS3) + voltage_mv = val * 8; + else + voltage_mv = DIV_ROUND_CLOSEST(val * 40, 1000); + + return snprintf(buf, PAGE_SIZE, "%d\n", voltage_mv); +} + +static ssize_t ina3221_set_voltage(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr); + struct ina3221_data *ina = dev_get_drvdata(dev); + unsigned int reg = sd_attr->index; + int val, ret; + + ret = kstrtoint(buf, 10, &val); + if (ret) + return ret; + + val = DIV_ROUND_CLOSEST(val, 40000) << 3; + + ret = regmap_write(ina->regmap, reg, val); + if (ret) + return ret; + + return count; +} + +static ssize_t ina3221_show_current(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr); + struct ina3221_data *ina = dev_get_drvdata(dev); + unsigned int channel = sd_attr->index; + unsigned int shunt_reg, resistance_uo; + int val, current_ma, shunt_voltage_mv, ret; + + shunt_reg = shunt_registers[channel]; + resistance_uo = ina->shunt_resistors[channel]; + if (resistance_uo == 0) { + current_ma = 0; + goto resistance_is_futile; + } + + ret = ina3221_read_value(ina, shunt_reg, &val); + if (ret) + return ret; + shunt_voltage_mv = val * 40000; + + current_ma = DIV_ROUND_CLOSEST(shunt_voltage_mv, resistance_uo); +resistance_is_futile: + return snprintf(buf, PAGE_SIZE, "%d\n", current_ma); +} + +static ssize_t ina3221_show_power(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr); + struct ina3221_data *ina = dev_get_drvdata(dev); + unsigned int channel = sd_attr->index; + unsigned int shunt_reg, bus_reg, resistance_uo; + int val, power_uw, current_ma, shunt_voltage_mv, bus_voltage_mv, ret; + + shunt_reg = shunt_registers[channel]; + bus_reg = bus_registers[channel]; + resistance_uo = ina->shunt_resistors[channel]; + if (resistance_uo == 0) { + power_uw = 0; + goto sorry_i_couldnt_resist; + } + + ret = ina3221_read_value(ina, shunt_reg, &val); + if (ret) + return ret; + shunt_voltage_mv = val * 40000; + + current_ma = DIV_ROUND_CLOSEST(shunt_voltage_mv, resistance_uo); + + ret = ina3221_read_value(ina, bus_reg, &val); + if (ret) + return ret; + bus_voltage_mv = val * 8; + + power_uw = current_ma * bus_voltage_mv; +sorry_i_couldnt_resist: + return snprintf(buf, PAGE_SIZE, "%d\n", power_uw); +} + +static ssize_t ina3221_show_shunt(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr); + struct ina3221_data *ina = dev_get_drvdata(dev); + unsigned int channel = sd_attr->index; + unsigned int resistance_uo; + + resistance_uo = ina->shunt_resistors[channel]; + + return snprintf(buf, PAGE_SIZE, "%d\n", resistance_uo); +} + +static ssize_t ina3221_set_shunt(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct sensor_device_attribute *sd_attr = to_sensor_dev_attr(attr); + struct ina3221_data *ina = dev_get_drvdata(dev); + unsigned int channel = sd_attr->index; + int ret; + + ret = kstrtouint(buf, 10, &ina->shunt_resistors[channel]); + if (ret) + return ret; + + return count; +} + +/* bus voltages */ +static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, ina3221_show_voltage, NULL, INA3221_BUS1); +static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, ina3221_show_voltage, NULL, INA3221_BUS2); +static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, ina3221_show_voltage, NULL, INA3221_BUS3); + +/* shunt voltages */ +static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, ina3221_show_voltage, NULL, INA3221_SHUNT1); +static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, ina3221_show_voltage, NULL, INA3221_SHUNT2); +static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, ina3221_show_voltage, NULL, INA3221_SHUNT3); + +/* calculated current */ +static SENSOR_DEVICE_ATTR(curr0_input, S_IRUGO, ina3221_show_current, NULL, INA3221_CHANNEL1); +static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, ina3221_show_current, NULL, INA3221_CHANNEL2); +static SENSOR_DEVICE_ATTR(curr2_input, S_IRUGO, ina3221_show_current, NULL, INA3221_CHANNEL3); + +/* calculated power */ +static SENSOR_DEVICE_ATTR(power0_input, S_IRUGO, ina3221_show_power, NULL, INA3221_CHANNEL1); +static SENSOR_DEVICE_ATTR(power1_input, S_IRUGO, ina3221_show_power, NULL, INA3221_CHANNEL2); +static SENSOR_DEVICE_ATTR(power2_input, S_IRUGO, ina3221_show_power, NULL, INA3221_CHANNEL3); + +/* shunt resistance */ +static SENSOR_DEVICE_ATTR(shunt0_resistor, (S_IRUGO | S_IWUSR), ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL1); +static SENSOR_DEVICE_ATTR(shunt1_resistor, (S_IRUGO | S_IWUSR), ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL2); +static SENSOR_DEVICE_ATTR(shunt2_resistor, (S_IRUGO | S_IWUSR), ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL3); + +/* critical alert */ +static SENSOR_DEVICE_ATTR(critical0_alarm, (S_IRUGO | S_IWUSR), ina3221_show_voltage, ina3221_set_voltage, INA3221_CRIT1); +static SENSOR_DEVICE_ATTR(critical1_alarm, (S_IRUGO | S_IWUSR), ina3221_show_voltage, ina3221_set_voltage, INA3221_CRIT2); +static SENSOR_DEVICE_ATTR(critical2_alarm, (S_IRUGO | S_IWUSR), ina3221_show_voltage, ina3221_set_voltage, INA3221_CRIT3); + +/* warning alert */ +static SENSOR_DEVICE_ATTR(warning0_alarm, (S_IRUGO | S_IWUSR), ina3221_show_voltage, ina3221_set_voltage, INA3221_WARN1); +static SENSOR_DEVICE_ATTR(warning1_alarm, (S_IRUGO | S_IWUSR), ina3221_show_voltage, ina3221_set_voltage, INA3221_WARN2); +static SENSOR_DEVICE_ATTR(warning2_alarm, (S_IRUGO | S_IWUSR), ina3221_show_voltage, ina3221_set_voltage, INA3221_WARN3); + +static struct attribute *ina3221_attrs[] = { + /* channel 1 */ + &sensor_dev_attr_in0_input.dev_attr.attr, + &sensor_dev_attr_curr0_input.dev_attr.attr, + &sensor_dev_attr_power0_input.dev_attr.attr, + &sensor_dev_attr_shunt0_resistor.dev_attr.attr, + &sensor_dev_attr_critical0_alarm.dev_attr.attr, + &sensor_dev_attr_warning0_alarm.dev_attr.attr, + &sensor_dev_attr_in3_input.dev_attr.attr, + + /* channel 2 */ + &sensor_dev_attr_in1_input.dev_attr.attr, + &sensor_dev_attr_curr1_input.dev_attr.attr, + &sensor_dev_attr_power1_input.dev_attr.attr, + &sensor_dev_attr_shunt1_resistor.dev_attr.attr, + &sensor_dev_attr_critical1_alarm.dev_attr.attr, + &sensor_dev_attr_warning1_alarm.dev_attr.attr, + &sensor_dev_attr_in4_input.dev_attr.attr, + + /* channel 3 */ + &sensor_dev_attr_in2_input.dev_attr.attr, + &sensor_dev_attr_curr2_input.dev_attr.attr, + &sensor_dev_attr_power2_input.dev_attr.attr, + &sensor_dev_attr_shunt2_resistor.dev_attr.attr, + &sensor_dev_attr_critical2_alarm.dev_attr.attr, + &sensor_dev_attr_warning2_alarm.dev_attr.attr, + &sensor_dev_attr_in5_input.dev_attr.attr, + + NULL, +}; +ATTRIBUTE_GROUPS(ina3221); + +static const struct regmap_range ina3221_yes_ranges[] = { + regmap_reg_range(INA3221_SHUNT1, INA3221_BUS3), + regmap_reg_range(INA3221_MASK_ENABLE, INA3221_MASK_ENABLE), +}; + +static const struct regmap_access_table ina3221_volatile_table = { + .yes_ranges = ina3221_yes_ranges, + .n_yes_ranges = ARRAY_SIZE(ina3221_yes_ranges), +}; + +static const struct regmap_config ina3221_regmap_config = { + .reg_bits = 8, + .val_bits = 16, + + .cache_type = REGCACHE_RBTREE, + .volatile_table = &ina3221_volatile_table, +}; + +static int ina3221_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct ina3221_data *ina; + struct device *hwmon_dev; + int i, ret; + + ina = devm_kzalloc(&client->dev, sizeof(*ina), GFP_KERNEL); + if (!ina) + return -ENOMEM; + i2c_set_clientdata(client, ina); + + ina->dev = &client->dev; + + ina->regmap = devm_regmap_init_i2c(client, &ina3221_regmap_config); + if (IS_ERR(ina->regmap)) { + dev_err(ina->dev, "Unable to allocate register map\n"); + return PTR_ERR(ina->regmap); + } + + for (i = 0; i < F_MAX_FIELDS; i++) { + ina->fields[i] = devm_regmap_field_alloc(ina->dev, + ina->regmap, + ina3221_reg_fields[i]); + if (IS_ERR(ina->fields[i])) { + dev_err(ina->dev, "Unable to allocate regmap fields\n"); + return PTR_ERR(ina->fields[i]); + } + } + + ret = regmap_field_write(ina->fields[F_RST], true); + if (ret) { + dev_err(ina->dev, "Unable to reset device\n"); + return ret; + } + + hwmon_dev = devm_hwmon_device_register_with_groups(ina->dev, + client->name, + ina, ina3221_groups); + if (IS_ERR(hwmon_dev)) { + dev_err(ina->dev, "Unable register hwmon device\n"); + return PTR_ERR(hwmon_dev); + } + + return 0; +} + +static const struct i2c_device_id ina3221_ids[] = { + { "ina3221", 0 }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(i2c, ina3221_ids); + +static struct i2c_driver ina3221_i2c_driver = { + .driver = { + .name = INA3221_DRIVER_NAME, + }, + .probe = ina3221_probe, + .id_table = ina3221_ids, +}; +module_i2c_driver(ina3221_i2c_driver); + +MODULE_AUTHOR("Andrew F. Davis <afd@xxxxxx>"); +MODULE_DESCRIPTION("Texas Instruments INA3221 HWMon Driver"); +MODULE_LICENSE("GPL v2"); -- 2.8.1 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
