diff options
Diffstat (limited to 'drivers/hwmon/ina3221.c')
| -rw-r--r-- | drivers/hwmon/ina3221.c | 445 |
1 files changed, 445 insertions, 0 deletions
diff --git a/drivers/hwmon/ina3221.c b/drivers/hwmon/ina3221.c new file mode 100644 index 000000000..8c9555313 --- /dev/null +++ b/drivers/hwmon/ina3221.c @@ -0,0 +1,445 @@ +/* + * INA3221 Triple Current/Voltage Monitor + * + * Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/ + * Andrew F. Davis <afd@ti.com> + * + * 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/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/regmap.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_MASK_ENABLE 0x0f + +#define INA3221_CONFIG_MODE_SHUNT BIT(0) +#define INA3221_CONFIG_MODE_BUS BIT(1) +#define INA3221_CONFIG_MODE_CONTINUOUS BIT(2) + +#define INA3221_RSHUNT_DEFAULT 10000 + +enum ina3221_fields { + /* Configuration */ + F_RST, + + /* Alert Flags */ + F_WF3, F_WF2, F_WF1, + F_CF3, F_CF2, F_CF1, + + /* sentinel */ + F_MAX_FIELDS +}; + +static const struct reg_field ina3221_reg_fields[] = { + [F_RST] = REG_FIELD(INA3221_CONFIG, 15, 15), + + [F_WF3] = REG_FIELD(INA3221_MASK_ENABLE, 3, 3), + [F_WF2] = REG_FIELD(INA3221_MASK_ENABLE, 4, 4), + [F_WF1] = REG_FIELD(INA3221_MASK_ENABLE, 5, 5), + [F_CF3] = REG_FIELD(INA3221_MASK_ENABLE, 7, 7), + [F_CF2] = REG_FIELD(INA3221_MASK_ENABLE, 8, 8), + [F_CF1] = REG_FIELD(INA3221_MASK_ENABLE, 9, 9), +}; + +enum ina3221_channels { + INA3221_CHANNEL1, + INA3221_CHANNEL2, + INA3221_CHANNEL3, + INA3221_NUM_CHANNELS +}; + +static const unsigned int register_channel[] = { + [INA3221_SHUNT1] = INA3221_CHANNEL1, + [INA3221_SHUNT2] = INA3221_CHANNEL2, + [INA3221_SHUNT3] = INA3221_CHANNEL3, + [INA3221_CRIT1] = INA3221_CHANNEL1, + [INA3221_CRIT2] = INA3221_CHANNEL2, + [INA3221_CRIT3] = INA3221_CHANNEL3, + [INA3221_WARN1] = INA3221_CHANNEL1, + [INA3221_WARN2] = INA3221_CHANNEL2, + [INA3221_WARN3] = INA3221_CHANNEL3, +}; + +/** + * struct ina3221_data - device specific information + * @regmap: Register map of the device + * @fields: Register fields of the device + * @shunt_resistors: Array of resistor values per channel + */ +struct ina3221_data { + struct regmap *regmap; + struct regmap_field *fields[F_MAX_FIELDS]; + int shunt_resistors[INA3221_NUM_CHANNELS]; +}; + +static int ina3221_read_value(struct ina3221_data *ina, unsigned int reg, + 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_bus_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; + + voltage_mv = val * 8; + + return snprintf(buf, PAGE_SIZE, "%d\n", voltage_mv); +} + +static ssize_t ina3221_show_shunt_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_uv, ret; + + ret = ina3221_read_value(ina, reg, &val); + if (ret) + return ret; + voltage_uv = val * 40; + + return snprintf(buf, PAGE_SIZE, "%d\n", voltage_uv); +} + +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 reg = sd_attr->index; + unsigned int channel = register_channel[reg]; + int resistance_uo = ina->shunt_resistors[channel]; + int val, current_ma, voltage_nv, ret; + + ret = ina3221_read_value(ina, reg, &val); + if (ret) + return ret; + voltage_nv = val * 40000; + + current_ma = DIV_ROUND_CLOSEST(voltage_nv, resistance_uo); + + return snprintf(buf, PAGE_SIZE, "%d\n", current_ma); +} + +static ssize_t ina3221_set_current(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; + unsigned int channel = register_channel[reg]; + int resistance_uo = ina->shunt_resistors[channel]; + int val, current_ma, voltage_uv, ret; + + ret = kstrtoint(buf, 0, ¤t_ma); + if (ret) + return ret; + + /* clamp current */ + current_ma = clamp_val(current_ma, + INT_MIN / resistance_uo, + INT_MAX / resistance_uo); + + voltage_uv = DIV_ROUND_CLOSEST(current_ma * resistance_uo, 1000); + + /* clamp voltage */ + voltage_uv = clamp_val(voltage_uv, -163800, 163800); + + /* 1 / 40uV(scale) << 3(register shift) = 5 */ + val = DIV_ROUND_CLOSEST(voltage_uv, 5) & 0xfff8; + + ret = regmap_write(ina->regmap, reg, val); + if (ret) + return ret; + + return count; +} + +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 val; + int ret; + + ret = kstrtoint(buf, 0, &val); + if (ret) + return ret; + + val = clamp_val(val, 1, INT_MAX); + + ina->shunt_resistors[channel] = val; + + return count; +} + +static ssize_t ina3221_show_alert(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 field = sd_attr->index; + unsigned int regval; + int ret; + + ret = regmap_field_read(ina->fields[field], ®val); + if (ret) + return ret; + + return snprintf(buf, PAGE_SIZE, "%d\n", regval); +} + +/* bus voltage */ +static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, + ina3221_show_bus_voltage, NULL, INA3221_BUS1); +static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, + ina3221_show_bus_voltage, NULL, INA3221_BUS2); +static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, + ina3221_show_bus_voltage, NULL, INA3221_BUS3); + +/* calculated current */ +static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, + ina3221_show_current, NULL, INA3221_SHUNT1); +static SENSOR_DEVICE_ATTR(curr2_input, S_IRUGO, + ina3221_show_current, NULL, INA3221_SHUNT2); +static SENSOR_DEVICE_ATTR(curr3_input, S_IRUGO, + ina3221_show_current, NULL, INA3221_SHUNT3); + +/* shunt resistance */ +static SENSOR_DEVICE_ATTR(shunt1_resistor, S_IRUGO | S_IWUSR, + ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL1); +static SENSOR_DEVICE_ATTR(shunt2_resistor, S_IRUGO | S_IWUSR, + ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL2); +static SENSOR_DEVICE_ATTR(shunt3_resistor, S_IRUGO | S_IWUSR, + ina3221_show_shunt, ina3221_set_shunt, INA3221_CHANNEL3); + +/* critical current */ +static SENSOR_DEVICE_ATTR(curr1_crit, S_IRUGO | S_IWUSR, + ina3221_show_current, ina3221_set_current, INA3221_CRIT1); +static SENSOR_DEVICE_ATTR(curr2_crit, S_IRUGO | S_IWUSR, + ina3221_show_current, ina3221_set_current, INA3221_CRIT2); +static SENSOR_DEVICE_ATTR(curr3_crit, S_IRUGO | S_IWUSR, + ina3221_show_current, ina3221_set_current, INA3221_CRIT3); + +/* critical current alert */ +static SENSOR_DEVICE_ATTR(curr1_crit_alarm, S_IRUGO, + ina3221_show_alert, NULL, F_CF1); +static SENSOR_DEVICE_ATTR(curr2_crit_alarm, S_IRUGO, + ina3221_show_alert, NULL, F_CF2); +static SENSOR_DEVICE_ATTR(curr3_crit_alarm, S_IRUGO, + ina3221_show_alert, NULL, F_CF3); + +/* warning current */ +static SENSOR_DEVICE_ATTR(curr1_max, S_IRUGO | S_IWUSR, + ina3221_show_current, ina3221_set_current, INA3221_WARN1); +static SENSOR_DEVICE_ATTR(curr2_max, S_IRUGO | S_IWUSR, + ina3221_show_current, ina3221_set_current, INA3221_WARN2); +static SENSOR_DEVICE_ATTR(curr3_max, S_IRUGO | S_IWUSR, + ina3221_show_current, ina3221_set_current, INA3221_WARN3); + +/* warning current alert */ +static SENSOR_DEVICE_ATTR(curr1_max_alarm, S_IRUGO, + ina3221_show_alert, NULL, F_WF1); +static SENSOR_DEVICE_ATTR(curr2_max_alarm, S_IRUGO, + ina3221_show_alert, NULL, F_WF2); +static SENSOR_DEVICE_ATTR(curr3_max_alarm, S_IRUGO, + ina3221_show_alert, NULL, F_WF3); + +/* shunt voltage */ +static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, + ina3221_show_shunt_voltage, NULL, INA3221_SHUNT1); +static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, + ina3221_show_shunt_voltage, NULL, INA3221_SHUNT2); +static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, + ina3221_show_shunt_voltage, NULL, INA3221_SHUNT3); + +static struct attribute *ina3221_attrs[] = { + /* channel 1 */ + &sensor_dev_attr_in1_input.dev_attr.attr, + &sensor_dev_attr_curr1_input.dev_attr.attr, + &sensor_dev_attr_shunt1_resistor.dev_attr.attr, + &sensor_dev_attr_curr1_crit.dev_attr.attr, + &sensor_dev_attr_curr1_crit_alarm.dev_attr.attr, + &sensor_dev_attr_curr1_max.dev_attr.attr, + &sensor_dev_attr_curr1_max_alarm.dev_attr.attr, + &sensor_dev_attr_in4_input.dev_attr.attr, + + /* channel 2 */ + &sensor_dev_attr_in2_input.dev_attr.attr, + &sensor_dev_attr_curr2_input.dev_attr.attr, + &sensor_dev_attr_shunt2_resistor.dev_attr.attr, + &sensor_dev_attr_curr2_crit.dev_attr.attr, + &sensor_dev_attr_curr2_crit_alarm.dev_attr.attr, + &sensor_dev_attr_curr2_max.dev_attr.attr, + &sensor_dev_attr_curr2_max_alarm.dev_attr.attr, + &sensor_dev_attr_in5_input.dev_attr.attr, + + /* channel 3 */ + &sensor_dev_attr_in3_input.dev_attr.attr, + &sensor_dev_attr_curr3_input.dev_attr.attr, + &sensor_dev_attr_shunt3_resistor.dev_attr.attr, + &sensor_dev_attr_curr3_crit.dev_attr.attr, + &sensor_dev_attr_curr3_crit_alarm.dev_attr.attr, + &sensor_dev_attr_curr3_max.dev_attr.attr, + &sensor_dev_attr_curr3_max_alarm.dev_attr.attr, + &sensor_dev_attr_in6_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 device *dev = &client->dev; + struct ina3221_data *ina; + struct device *hwmon_dev; + int i, ret; + + ina = devm_kzalloc(dev, sizeof(*ina), GFP_KERNEL); + if (!ina) + return -ENOMEM; + + ina->regmap = devm_regmap_init_i2c(client, &ina3221_regmap_config); + if (IS_ERR(ina->regmap)) { + dev_err(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(dev, + ina->regmap, + ina3221_reg_fields[i]); + if (IS_ERR(ina->fields[i])) { + dev_err(dev, "Unable to allocate regmap fields\n"); + return PTR_ERR(ina->fields[i]); + } + } + + for (i = 0; i < INA3221_NUM_CHANNELS; i++) + ina->shunt_resistors[i] = INA3221_RSHUNT_DEFAULT; + + ret = regmap_field_write(ina->fields[F_RST], true); + if (ret) { + dev_err(dev, "Unable to reset device\n"); + return ret; + } + + hwmon_dev = devm_hwmon_device_register_with_groups(dev, + client->name, + ina, ina3221_groups); + if (IS_ERR(hwmon_dev)) { + dev_err(dev, "Unable to register hwmon device\n"); + return PTR_ERR(hwmon_dev); + } + + return 0; +} + +static const struct of_device_id ina3221_of_match_table[] = { + { .compatible = "ti,ina3221", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, ina3221_of_match_table); + +static const struct i2c_device_id ina3221_ids[] = { + { "ina3221", 0 }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(i2c, ina3221_ids); + +static struct i2c_driver ina3221_i2c_driver = { + .probe = ina3221_probe, + .driver = { + .name = INA3221_DRIVER_NAME, + .of_match_table = ina3221_of_match_table, + }, + .id_table = ina3221_ids, +}; +module_i2c_driver(ina3221_i2c_driver); + +MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); +MODULE_DESCRIPTION("Texas Instruments INA3221 HWMon Driver"); +MODULE_LICENSE("GPL v2"); |