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ltc2983.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Analog Devices LTC2983 Multi-Sensor Digital Temperature Measurement System
* driver
*
* Copyright 2019 Analog Devices Inc.
*/
#include <linux/bitfield.h>
#include <linux/completion.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/iio/iio.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
/* register map */
#define LTC2983_STATUS_REG 0x0000
#define LTC2983_TEMP_RES_START_REG 0x0010
#define LTC2983_TEMP_RES_END_REG 0x005F
#define LTC2983_GLOBAL_CONFIG_REG 0x00F0
#define LTC2983_MULT_CHANNEL_START_REG 0x00F4
#define LTC2983_MULT_CHANNEL_END_REG 0x00F7
#define LTC2983_MUX_CONFIG_REG 0x00FF
#define LTC2983_CHAN_ASSIGN_START_REG 0x0200
#define LTC2983_CHAN_ASSIGN_END_REG 0x024F
#define LTC2983_CUST_SENS_TBL_START_REG 0x0250
#define LTC2983_CUST_SENS_TBL_END_REG 0x03CF
#define LTC2983_DIFFERENTIAL_CHAN_MIN 2
#define LTC2983_MAX_CHANNELS_NR 20
#define LTC2983_MIN_CHANNELS_NR 1
#define LTC2983_SLEEP 0x97
#define LTC2983_CUSTOM_STEINHART_SIZE 24
#define LTC2983_CUSTOM_SENSOR_ENTRY_SZ 6
#define LTC2983_CUSTOM_STEINHART_ENTRY_SZ 4
#define LTC2983_CHAN_START_ADDR(chan) \
(((chan - 1) * 4) + LTC2983_CHAN_ASSIGN_START_REG)
#define LTC2983_CHAN_RES_ADDR(chan) \
(((chan - 1) * 4) + LTC2983_TEMP_RES_START_REG)
#define LTC2983_THERMOCOUPLE_DIFF_MASK BIT(3)
#define LTC2983_THERMOCOUPLE_SGL(x) \
FIELD_PREP(LTC2983_THERMOCOUPLE_DIFF_MASK, x)
#define LTC2983_THERMOCOUPLE_OC_CURR_MASK GENMASK(1, 0)
#define LTC2983_THERMOCOUPLE_OC_CURR(x) \
FIELD_PREP(LTC2983_THERMOCOUPLE_OC_CURR_MASK, x)
#define LTC2983_THERMOCOUPLE_OC_CHECK_MASK BIT(2)
#define LTC2983_THERMOCOUPLE_OC_CHECK(x) \
FIELD_PREP(LTC2983_THERMOCOUPLE_OC_CHECK_MASK, x)
#define LTC2983_THERMISTOR_DIFF_MASK BIT(2)
#define LTC2983_THERMISTOR_SGL(x) \
FIELD_PREP(LTC2983_THERMISTOR_DIFF_MASK, x)
#define LTC2983_THERMISTOR_R_SHARE_MASK BIT(1)
#define LTC2983_THERMISTOR_R_SHARE(x) \
FIELD_PREP(LTC2983_THERMISTOR_R_SHARE_MASK, x)
#define LTC2983_THERMISTOR_C_ROTATE_MASK BIT(0)
#define LTC2983_THERMISTOR_C_ROTATE(x) \
FIELD_PREP(LTC2983_THERMISTOR_C_ROTATE_MASK, x)
#define LTC2983_DIODE_DIFF_MASK BIT(2)
#define LTC2983_DIODE_SGL(x) \
FIELD_PREP(LTC2983_DIODE_DIFF_MASK, x)
#define LTC2983_DIODE_3_CONV_CYCLE_MASK BIT(1)
#define LTC2983_DIODE_3_CONV_CYCLE(x) \
FIELD_PREP(LTC2983_DIODE_3_CONV_CYCLE_MASK, x)
#define LTC2983_DIODE_AVERAGE_ON_MASK BIT(0)
#define LTC2983_DIODE_AVERAGE_ON(x) \
FIELD_PREP(LTC2983_DIODE_AVERAGE_ON_MASK, x)
#define LTC2983_RTD_4_WIRE_MASK BIT(3)
#define LTC2983_RTD_ROTATION_MASK BIT(1)
#define LTC2983_RTD_C_ROTATE(x) \
FIELD_PREP(LTC2983_RTD_ROTATION_MASK, x)
#define LTC2983_RTD_KELVIN_R_SENSE_MASK GENMASK(3, 2)
#define LTC2983_RTD_N_WIRES_MASK GENMASK(3, 2)
#define LTC2983_RTD_N_WIRES(x) \
FIELD_PREP(LTC2983_RTD_N_WIRES_MASK, x)
#define LTC2983_RTD_R_SHARE_MASK BIT(0)
#define LTC2983_RTD_R_SHARE(x) \
FIELD_PREP(LTC2983_RTD_R_SHARE_MASK, 1)
#define LTC2983_COMMON_HARD_FAULT_MASK GENMASK(31, 30)
#define LTC2983_COMMON_SOFT_FAULT_MASK GENMASK(27, 25)
#define LTC2983_STATUS_START_MASK BIT(7)
#define LTC2983_STATUS_START(x) FIELD_PREP(LTC2983_STATUS_START_MASK, x)
#define LTC2983_STATUS_UP_MASK GENMASK(7, 6)
#define LTC2983_STATUS_UP(reg) FIELD_GET(LTC2983_STATUS_UP_MASK, reg)
#define LTC2983_STATUS_CHAN_SEL_MASK GENMASK(4, 0)
#define LTC2983_STATUS_CHAN_SEL(x) \
FIELD_PREP(LTC2983_STATUS_CHAN_SEL_MASK, x)
#define LTC2983_TEMP_UNITS_MASK BIT(2)
#define LTC2983_TEMP_UNITS(x) FIELD_PREP(LTC2983_TEMP_UNITS_MASK, x)
#define LTC2983_NOTCH_FREQ_MASK GENMASK(1, 0)
#define LTC2983_NOTCH_FREQ(x) FIELD_PREP(LTC2983_NOTCH_FREQ_MASK, x)
#define LTC2983_RES_VALID_MASK BIT(24)
#define LTC2983_DATA_MASK GENMASK(23, 0)
#define LTC2983_DATA_SIGN_BIT 23
#define LTC2983_CHAN_TYPE_MASK GENMASK(31, 27)
#define LTC2983_CHAN_TYPE(x) FIELD_PREP(LTC2983_CHAN_TYPE_MASK, x)
/* cold junction for thermocouples and rsense for rtd's and thermistor's */
#define LTC2983_CHAN_ASSIGN_MASK GENMASK(26, 22)
#define LTC2983_CHAN_ASSIGN(x) FIELD_PREP(LTC2983_CHAN_ASSIGN_MASK, x)
#define LTC2983_CUSTOM_LEN_MASK GENMASK(5, 0)
#define LTC2983_CUSTOM_LEN(x) FIELD_PREP(LTC2983_CUSTOM_LEN_MASK, x)
#define LTC2983_CUSTOM_ADDR_MASK GENMASK(11, 6)
#define LTC2983_CUSTOM_ADDR(x) FIELD_PREP(LTC2983_CUSTOM_ADDR_MASK, x)
#define LTC2983_THERMOCOUPLE_CFG_MASK GENMASK(21, 18)
#define LTC2983_THERMOCOUPLE_CFG(x) \
FIELD_PREP(LTC2983_THERMOCOUPLE_CFG_MASK, x)
#define LTC2983_THERMOCOUPLE_HARD_FAULT_MASK GENMASK(31, 29)
#define LTC2983_THERMOCOUPLE_SOFT_FAULT_MASK GENMASK(28, 25)
#define LTC2983_RTD_CFG_MASK GENMASK(21, 18)
#define LTC2983_RTD_CFG(x) FIELD_PREP(LTC2983_RTD_CFG_MASK, x)
#define LTC2983_RTD_EXC_CURRENT_MASK GENMASK(17, 14)
#define LTC2983_RTD_EXC_CURRENT(x) \
FIELD_PREP(LTC2983_RTD_EXC_CURRENT_MASK, x)
#define LTC2983_RTD_CURVE_MASK GENMASK(13, 12)
#define LTC2983_RTD_CURVE(x) FIELD_PREP(LTC2983_RTD_CURVE_MASK, x)
#define LTC2983_THERMISTOR_CFG_MASK GENMASK(21, 19)
#define LTC2983_THERMISTOR_CFG(x) \
FIELD_PREP(LTC2983_THERMISTOR_CFG_MASK, x)
#define LTC2983_THERMISTOR_EXC_CURRENT_MASK GENMASK(18, 15)
#define LTC2983_THERMISTOR_EXC_CURRENT(x) \
FIELD_PREP(LTC2983_THERMISTOR_EXC_CURRENT_MASK, x)
#define LTC2983_DIODE_CFG_MASK GENMASK(26, 24)
#define LTC2983_DIODE_CFG(x) FIELD_PREP(LTC2983_DIODE_CFG_MASK, x)
#define LTC2983_DIODE_EXC_CURRENT_MASK GENMASK(23, 22)
#define LTC2983_DIODE_EXC_CURRENT(x) \
FIELD_PREP(LTC2983_DIODE_EXC_CURRENT_MASK, x)
#define LTC2983_DIODE_IDEAL_FACTOR_MASK GENMASK(21, 0)
#define LTC2983_DIODE_IDEAL_FACTOR(x) \
FIELD_PREP(LTC2983_DIODE_IDEAL_FACTOR_MASK, x)
#define LTC2983_R_SENSE_VAL_MASK GENMASK(26, 0)
#define LTC2983_R_SENSE_VAL(x) FIELD_PREP(LTC2983_R_SENSE_VAL_MASK, x)
#define LTC2983_ADC_SINGLE_ENDED_MASK BIT(26)
#define LTC2983_ADC_SINGLE_ENDED(x) \
FIELD_PREP(LTC2983_ADC_SINGLE_ENDED_MASK, x)
enum {
LTC2983_SENSOR_THERMOCOUPLE = 1,
LTC2983_SENSOR_THERMOCOUPLE_CUSTOM = 9,
LTC2983_SENSOR_RTD = 10,
LTC2983_SENSOR_RTD_CUSTOM = 18,
LTC2983_SENSOR_THERMISTOR = 19,
LTC2983_SENSOR_THERMISTOR_STEINHART = 26,
LTC2983_SENSOR_THERMISTOR_CUSTOM = 27,
LTC2983_SENSOR_DIODE = 28,
LTC2983_SENSOR_SENSE_RESISTOR = 29,
LTC2983_SENSOR_DIRECT_ADC = 30,
};
#define to_thermocouple(_sensor) \
container_of(_sensor, struct ltc2983_thermocouple, sensor)
#define to_rtd(_sensor) \
container_of(_sensor, struct ltc2983_rtd, sensor)
#define to_thermistor(_sensor) \
container_of(_sensor, struct ltc2983_thermistor, sensor)
#define to_diode(_sensor) \
container_of(_sensor, struct ltc2983_diode, sensor)
#define to_rsense(_sensor) \
container_of(_sensor, struct ltc2983_rsense, sensor)
#define to_adc(_sensor) \
container_of(_sensor, struct ltc2983_adc, sensor)
struct ltc2983_data {
struct regmap *regmap;
struct spi_device *spi;
struct mutex lock;
struct completion completion;
struct iio_chan_spec *iio_chan;
struct ltc2983_sensor **sensors;
u32 mux_delay_config;
u32 filter_notch_freq;
u16 custom_table_size;
u8 num_channels;
u8 iio_channels;
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
* Holds the converted temperature
*/
__be32 temp ____cacheline_aligned;
};
struct ltc2983_sensor {
int (*fault_handler)(const struct ltc2983_data *st, const u32 result);
int (*assign_chan)(struct ltc2983_data *st,
const struct ltc2983_sensor *sensor);
/* specifies the sensor channel */
u32 chan;
/* sensor type */
u32 type;
};
struct ltc2983_custom_sensor {
/* raw table sensor data */
void *table;
size_t size;
/* address offset */
s8 offset;
bool is_steinhart;
};
struct ltc2983_thermocouple {
struct ltc2983_sensor sensor;
struct ltc2983_custom_sensor *custom;
u32 sensor_config;
u32 cold_junction_chan;
};
struct ltc2983_rtd {
struct ltc2983_sensor sensor;
struct ltc2983_custom_sensor *custom;
u32 sensor_config;
u32 r_sense_chan;
u32 excitation_current;
u32 rtd_curve;
};
struct ltc2983_thermistor {
struct ltc2983_sensor sensor;
struct ltc2983_custom_sensor *custom;
u32 sensor_config;
u32 r_sense_chan;
u32 excitation_current;
};
struct ltc2983_diode {
struct ltc2983_sensor sensor;
u32 sensor_config;
u32 excitation_current;
u32 ideal_factor_value;
};
struct ltc2983_rsense {
struct ltc2983_sensor sensor;
u32 r_sense_val;
};
struct ltc2983_adc {
struct ltc2983_sensor sensor;
bool single_ended;
};
/*
* Convert to Q format numbers. These number's are integers where
* the number of integer and fractional bits are specified. The resolution
* is given by 1/@resolution and tell us the number of fractional bits. For
* instance a resolution of 2^-10 means we have 10 fractional bits.
*/
static u32 __convert_to_raw(const u64 val, const u32 resolution)
{
u64 __res = val * resolution;
/* all values are multiplied by 1000000 to remove the fraction */
do_div(__res, 1000000);
return __res;
}
static u32 __convert_to_raw_sign(const u64 val, const u32 resolution)
{
s64 __res = -(s32)val;
__res = __convert_to_raw(__res, resolution);
return (u32)-__res;
}
static int __ltc2983_fault_handler(const struct ltc2983_data *st,
const u32 result, const u32 hard_mask,
const u32 soft_mask)
{
const struct device *dev = &st->spi->dev;
if (result & hard_mask) {
dev_err(dev, "Invalid conversion: Sensor HARD fault\n");
return -EIO;
} else if (result & soft_mask) {
/* just print a warning */
dev_warn(dev, "Suspicious conversion: Sensor SOFT fault\n");
}
return 0;
}
static int __ltc2983_chan_assign_common(const struct ltc2983_data *st,
const struct ltc2983_sensor *sensor,
u32 chan_val)
{
u32 reg = LTC2983_CHAN_START_ADDR(sensor->chan);
__be32 __chan_val;
chan_val |= LTC2983_CHAN_TYPE(sensor->type);
dev_dbg(&st->spi->dev, "Assign reg:0x%04X, val:0x%08X\n", reg,
chan_val);
__chan_val = cpu_to_be32(chan_val);
return regmap_bulk_write(st->regmap, reg, &__chan_val,
sizeof(__chan_val));
}
static int __ltc2983_chan_custom_sensor_assign(struct ltc2983_data *st,
struct ltc2983_custom_sensor *custom,
u32 *chan_val)
{
u32 reg;
u8 mult = custom->is_steinhart ? LTC2983_CUSTOM_STEINHART_ENTRY_SZ :
LTC2983_CUSTOM_SENSOR_ENTRY_SZ;
const struct device *dev = &st->spi->dev;
/*
* custom->size holds the raw size of the table. However, when
* configuring the sensor channel, we must write the number of
* entries of the table minus 1. For steinhart sensors 0 is written
* since the size is constant!
*/
const u8 len = custom->is_steinhart ? 0 :
(custom->size / LTC2983_CUSTOM_SENSOR_ENTRY_SZ) - 1;
/*
* Check if the offset was assigned already. It should be for steinhart
* sensors. When coming from sleep, it should be assigned for all.
*/
if (custom->offset < 0) {
/*
* This needs to be done again here because, from the moment
* when this test was done (successfully) for this custom
* sensor, a steinhart sensor might have been added changing
* custom_table_size...
*/
if (st->custom_table_size + custom->size >
(LTC2983_CUST_SENS_TBL_END_REG -
LTC2983_CUST_SENS_TBL_START_REG) + 1) {
dev_err(dev,
"Not space left(%d) for new custom sensor(%zu)",
st->custom_table_size,
custom->size);
return -EINVAL;
}
custom->offset = st->custom_table_size /
LTC2983_CUSTOM_SENSOR_ENTRY_SZ;
st->custom_table_size += custom->size;
}
reg = (custom->offset * mult) + LTC2983_CUST_SENS_TBL_START_REG;
*chan_val |= LTC2983_CUSTOM_LEN(len);
*chan_val |= LTC2983_CUSTOM_ADDR(custom->offset);
dev_dbg(dev, "Assign custom sensor, reg:0x%04X, off:%d, sz:%zu",
reg, custom->offset,
custom->size);
/* write custom sensor table */
return regmap_bulk_write(st->regmap, reg, custom->table, custom->size);
}
static struct ltc2983_custom_sensor *
__ltc2983_custom_sensor_new(struct ltc2983_data *st, const struct fwnode_handle *fn,
const char *propname, const bool is_steinhart,
const u32 resolution, const bool has_signed)
{
struct ltc2983_custom_sensor *new_custom;
struct device *dev = &st->spi->dev;
/*
* For custom steinhart, the full u32 is taken. For all the others
* the MSB is discarded.
*/
const u8 n_size = is_steinhart ? 4 : 3;
u8 index, n_entries;
int ret;
if (is_steinhart)
n_entries = fwnode_property_count_u32(fn, propname);
else
n_entries = fwnode_property_count_u64(fn, propname);
/* n_entries must be an even number */
if (!n_entries || (n_entries % 2) != 0) {
dev_err(dev, "Number of entries either 0 or not even\n");
return ERR_PTR(-EINVAL);
}
new_custom = devm_kzalloc(dev, sizeof(*new_custom), GFP_KERNEL);
if (!new_custom)
return ERR_PTR(-ENOMEM);
new_custom->size = n_entries * n_size;
/* check Steinhart size */
if (is_steinhart && new_custom->size != LTC2983_CUSTOM_STEINHART_SIZE) {
dev_err(dev, "Steinhart sensors size(%zu) must be %u\n", new_custom->size,
LTC2983_CUSTOM_STEINHART_SIZE);
return ERR_PTR(-EINVAL);
}
/* Check space on the table. */
if (st->custom_table_size + new_custom->size >
(LTC2983_CUST_SENS_TBL_END_REG -
LTC2983_CUST_SENS_TBL_START_REG) + 1) {
dev_err(dev, "No space left(%d) for new custom sensor(%zu)",
st->custom_table_size, new_custom->size);
return ERR_PTR(-EINVAL);
}
/* allocate the table */
if (is_steinhart)
new_custom->table = devm_kcalloc(dev, n_entries, sizeof(u32), GFP_KERNEL);
else
new_custom->table = devm_kcalloc(dev, n_entries, sizeof(u64), GFP_KERNEL);
if (!new_custom->table)
return ERR_PTR(-ENOMEM);
/*
* Steinhart sensors are configured with raw values in the firmware
* node. For the other sensors we must convert the value to raw.
* The odd index's correspond to temperatures and always have 1/1024
* of resolution. Temperatures also come in Kelvin, so signed values
* are not possible.
*/
if (is_steinhart) {
ret = fwnode_property_read_u32_array(fn, propname, new_custom->table, n_entries);
if (ret < 0)
return ERR_PTR(ret);
cpu_to_be32_array(new_custom->table, new_custom->table, n_entries);
} else {
ret = fwnode_property_read_u64_array(fn, propname, new_custom->table, n_entries);
if (ret < 0)
return ERR_PTR(ret);
for (index = 0; index < n_entries; index++) {
u64 temp = ((u64 *)new_custom->table)[index];
if ((index % 2) != 0)
temp = __convert_to_raw(temp, 1024);
else if (has_signed && (s64)temp < 0)
temp = __convert_to_raw_sign(temp, resolution);
else
temp = __convert_to_raw(temp, resolution);
put_unaligned_be24(temp, new_custom->table + index * 3);
}
}
new_custom->is_steinhart = is_steinhart;
/*
* This is done to first add all the steinhart sensors to the table,
* in order to maximize the table usage. If we mix adding steinhart
* with the other sensors, we might have to do some roundup to make
* sure that sensor_addr - 0x250(start address) is a multiple of 4
* (for steinhart), and a multiple of 6 for all the other sensors.
* Since we have const 24 bytes for steinhart sensors and 24 is
* also a multiple of 6, we guarantee that the first non-steinhart
* sensor will sit in a correct address without the need of filling
* addresses.
*/
if (is_steinhart) {
new_custom->offset = st->custom_table_size /
LTC2983_CUSTOM_STEINHART_ENTRY_SZ;
st->custom_table_size += new_custom->size;
} else {
/* mark as unset. This is checked later on the assign phase */
new_custom->offset = -1;
}
return new_custom;
}
static int ltc2983_thermocouple_fault_handler(const struct ltc2983_data *st,
const u32 result)
{
return __ltc2983_fault_handler(st, result,
LTC2983_THERMOCOUPLE_HARD_FAULT_MASK,
LTC2983_THERMOCOUPLE_SOFT_FAULT_MASK);
}
static int ltc2983_common_fault_handler(const struct ltc2983_data *st,
const u32 result)
{
return __ltc2983_fault_handler(st, result,
LTC2983_COMMON_HARD_FAULT_MASK,
LTC2983_COMMON_SOFT_FAULT_MASK);
}
static int ltc2983_thermocouple_assign_chan(struct ltc2983_data *st,
const struct ltc2983_sensor *sensor)
{
struct ltc2983_thermocouple *thermo = to_thermocouple(sensor);
u32 chan_val;
chan_val = LTC2983_CHAN_ASSIGN(thermo->cold_junction_chan);
chan_val |= LTC2983_THERMOCOUPLE_CFG(thermo->sensor_config);
if (thermo->custom) {
int ret;
ret = __ltc2983_chan_custom_sensor_assign(st, thermo->custom,
&chan_val);
if (ret)
return ret;
}
return __ltc2983_chan_assign_common(st, sensor, chan_val);
}
static int ltc2983_rtd_assign_chan(struct ltc2983_data *st,
const struct ltc2983_sensor *sensor)
{
struct ltc2983_rtd *rtd = to_rtd(sensor);
u32 chan_val;
chan_val = LTC2983_CHAN_ASSIGN(rtd->r_sense_chan);
chan_val |= LTC2983_RTD_CFG(rtd->sensor_config);
chan_val |= LTC2983_RTD_EXC_CURRENT(rtd->excitation_current);
chan_val |= LTC2983_RTD_CURVE(rtd->rtd_curve);
if (rtd->custom) {
int ret;
ret = __ltc2983_chan_custom_sensor_assign(st, rtd->custom,
&chan_val);
if (ret)
return ret;
}
return __ltc2983_chan_assign_common(st, sensor, chan_val);
}
static int ltc2983_thermistor_assign_chan(struct ltc2983_data *st,
const struct ltc2983_sensor *sensor)
{
struct ltc2983_thermistor *thermistor = to_thermistor(sensor);
u32 chan_val;
chan_val = LTC2983_CHAN_ASSIGN(thermistor->r_sense_chan);
chan_val |= LTC2983_THERMISTOR_CFG(thermistor->sensor_config);
chan_val |=
LTC2983_THERMISTOR_EXC_CURRENT(thermistor->excitation_current);
if (thermistor->custom) {
int ret;
ret = __ltc2983_chan_custom_sensor_assign(st,
thermistor->custom,
&chan_val);
if (ret)
return ret;
}
return __ltc2983_chan_assign_common(st, sensor, chan_val);
}
static int ltc2983_diode_assign_chan(struct ltc2983_data *st,
const struct ltc2983_sensor *sensor)
{
struct ltc2983_diode *diode = to_diode(sensor);
u32 chan_val;
chan_val = LTC2983_DIODE_CFG(diode->sensor_config);
chan_val |= LTC2983_DIODE_EXC_CURRENT(diode->excitation_current);
chan_val |= LTC2983_DIODE_IDEAL_FACTOR(diode->ideal_factor_value);
return __ltc2983_chan_assign_common(st, sensor, chan_val);
}
static int ltc2983_r_sense_assign_chan(struct ltc2983_data *st,
const struct ltc2983_sensor *sensor)
{
struct ltc2983_rsense *rsense = to_rsense(sensor);
u32 chan_val;
chan_val = LTC2983_R_SENSE_VAL(rsense->r_sense_val);
return __ltc2983_chan_assign_common(st, sensor, chan_val);
}
static int ltc2983_adc_assign_chan(struct ltc2983_data *st,
const struct ltc2983_sensor *sensor)
{
struct ltc2983_adc *adc = to_adc(sensor);
u32 chan_val;
chan_val = LTC2983_ADC_SINGLE_ENDED(adc->single_ended);
return __ltc2983_chan_assign_common(st, sensor, chan_val);
}
static struct ltc2983_sensor *
ltc2983_thermocouple_new(const struct fwnode_handle *child, struct ltc2983_data *st,
const struct ltc2983_sensor *sensor)
{
struct ltc2983_thermocouple *thermo;
struct fwnode_handle *ref;
u32 oc_current;
int ret;
thermo = devm_kzalloc(&st->spi->dev, sizeof(*thermo), GFP_KERNEL);
if (!thermo)
return ERR_PTR(-ENOMEM);
if (fwnode_property_read_bool(child, "adi,single-ended"))
thermo->sensor_config = LTC2983_THERMOCOUPLE_SGL(1);
ret = fwnode_property_read_u32(child, "adi,sensor-oc-current-microamp", &oc_current);
if (!ret) {
switch (oc_current) {
case 10:
thermo->sensor_config |=
LTC2983_THERMOCOUPLE_OC_CURR(0);
break;
case 100:
thermo->sensor_config |=
LTC2983_THERMOCOUPLE_OC_CURR(1);
break;
case 500:
thermo->sensor_config |=
LTC2983_THERMOCOUPLE_OC_CURR(2);
break;
case 1000:
thermo->sensor_config |=
LTC2983_THERMOCOUPLE_OC_CURR(3);
break;
default:
dev_err(&st->spi->dev,
"Invalid open circuit current:%u", oc_current);
return ERR_PTR(-EINVAL);
}
thermo->sensor_config |= LTC2983_THERMOCOUPLE_OC_CHECK(1);
}
/* validate channel index */
if (!(thermo->sensor_config & LTC2983_THERMOCOUPLE_DIFF_MASK) &&
sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
dev_err(&st->spi->dev,
"Invalid chann:%d for differential thermocouple",
sensor->chan);
return ERR_PTR(-EINVAL);
}
ref = fwnode_find_reference(child, "adi,cold-junction-handle", 0);
if (IS_ERR(ref)) {
ref = NULL;
} else {
ret = fwnode_property_read_u32(ref, "reg", &thermo->cold_junction_chan);
if (ret) {
/*
* This would be catched later but we can just return
* the error right away.
*/
dev_err(&st->spi->dev, "Property reg must be given\n");
goto fail;
}
}
/* check custom sensor */
if (sensor->type == LTC2983_SENSOR_THERMOCOUPLE_CUSTOM) {
const char *propname = "adi,custom-thermocouple";
thermo->custom = __ltc2983_custom_sensor_new(st, child,
propname, false,
16384, true);
if (IS_ERR(thermo->custom)) {
ret = PTR_ERR(thermo->custom);
goto fail;
}
}
/* set common parameters */
thermo->sensor.fault_handler = ltc2983_thermocouple_fault_handler;
thermo->sensor.assign_chan = ltc2983_thermocouple_assign_chan;
fwnode_handle_put(ref);
return &thermo->sensor;
fail:
fwnode_handle_put(ref);
return ERR_PTR(ret);
}
static struct ltc2983_sensor *
ltc2983_rtd_new(const struct fwnode_handle *child, struct ltc2983_data *st,
const struct ltc2983_sensor *sensor)
{
struct ltc2983_rtd *rtd;
int ret = 0;
struct device *dev = &st->spi->dev;
struct fwnode_handle *ref;
u32 excitation_current = 0, n_wires = 0;
rtd = devm_kzalloc(dev, sizeof(*rtd), GFP_KERNEL);
if (!rtd)
return ERR_PTR(-ENOMEM);
ref = fwnode_find_reference(child, "adi,rsense-handle", 0);
if (IS_ERR(ref)) {
dev_err(dev, "Property adi,rsense-handle missing or invalid");
return ERR_CAST(ref);
}
ret = fwnode_property_read_u32(ref, "reg", &rtd->r_sense_chan);
if (ret) {
dev_err(dev, "Property reg must be given\n");
goto fail;
}
ret = fwnode_property_read_u32(child, "adi,number-of-wires", &n_wires);
if (!ret) {
switch (n_wires) {
case 2:
rtd->sensor_config = LTC2983_RTD_N_WIRES(0);
break;
case 3:
rtd->sensor_config = LTC2983_RTD_N_WIRES(1);
break;
case 4:
rtd->sensor_config = LTC2983_RTD_N_WIRES(2);
break;
case 5:
/* 4 wires, Kelvin Rsense */
rtd->sensor_config = LTC2983_RTD_N_WIRES(3);
break;
default:
dev_err(dev, "Invalid number of wires:%u\n", n_wires);
ret = -EINVAL;
goto fail;
}
}
if (fwnode_property_read_bool(child, "adi,rsense-share")) {
/* Current rotation is only available with rsense sharing */
if (fwnode_property_read_bool(child, "adi,current-rotate")) {
if (n_wires == 2 || n_wires == 3) {
dev_err(dev,
"Rotation not allowed for 2/3 Wire RTDs");
ret = -EINVAL;
goto fail;
}
rtd->sensor_config |= LTC2983_RTD_C_ROTATE(1);
} else {
rtd->sensor_config |= LTC2983_RTD_R_SHARE(1);
}
}
/*
* rtd channel indexes are a bit more complicated to validate.
* For 4wire RTD with rotation, the channel selection cannot be
* >=19 since the chann + 1 is used in this configuration.
* For 4wire RTDs with kelvin rsense, the rsense channel cannot be
* <=1 since chanel - 1 and channel - 2 are used.
*/
if (rtd->sensor_config & LTC2983_RTD_4_WIRE_MASK) {
/* 4-wire */
u8 min = LTC2983_DIFFERENTIAL_CHAN_MIN,
max = LTC2983_MAX_CHANNELS_NR;
if (rtd->sensor_config & LTC2983_RTD_ROTATION_MASK)
max = LTC2983_MAX_CHANNELS_NR - 1;
if (((rtd->sensor_config & LTC2983_RTD_KELVIN_R_SENSE_MASK)
== LTC2983_RTD_KELVIN_R_SENSE_MASK) &&
(rtd->r_sense_chan <= min)) {
/* kelvin rsense*/
dev_err(dev,
"Invalid rsense chann:%d to use in kelvin rsense",
rtd->r_sense_chan);
ret = -EINVAL;
goto fail;
}
if (sensor->chan < min || sensor->chan > max) {
dev_err(dev, "Invalid chann:%d for the rtd config",
sensor->chan);
ret = -EINVAL;
goto fail;
}
} else {
/* same as differential case */
if (sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
dev_err(&st->spi->dev,
"Invalid chann:%d for RTD", sensor->chan);
ret = -EINVAL;
goto fail;
}
}
/* check custom sensor */
if (sensor->type == LTC2983_SENSOR_RTD_CUSTOM) {
rtd->custom = __ltc2983_custom_sensor_new(st, child,
"adi,custom-rtd",
false, 2048, false);
if (IS_ERR(rtd->custom)) {
ret = PTR_ERR(rtd->custom);
goto fail;
}
}
/* set common parameters */
rtd->sensor.fault_handler = ltc2983_common_fault_handler;
rtd->sensor.assign_chan = ltc2983_rtd_assign_chan;
ret = fwnode_property_read_u32(child, "adi,excitation-current-microamp",
&excitation_current);
if (ret) {
/* default to 5uA */
rtd->excitation_current = 1;
} else {
switch (excitation_current) {
case 5:
rtd->excitation_current = 0x01;
break;
case 10:
rtd->excitation_current = 0x02;
break;
case 25:
rtd->excitation_current = 0x03;
break;
case 50:
rtd->excitation_current = 0x04;
break;
case 100:
rtd->excitation_current = 0x05;
break;
case 250:
rtd->excitation_current = 0x06;
break;
case 500:
rtd->excitation_current = 0x07;
break;
case 1000:
rtd->excitation_current = 0x08;
break;
default:
dev_err(&st->spi->dev,
"Invalid value for excitation current(%u)",
excitation_current);
ret = -EINVAL;
goto fail;
}
}
fwnode_property_read_u32(child, "adi,rtd-curve", &rtd->rtd_curve);
fwnode_handle_put(ref);
return &rtd->sensor;
fail:
fwnode_handle_put(ref);
return ERR_PTR(ret);
}
static struct ltc2983_sensor *
ltc2983_thermistor_new(const struct fwnode_handle *child, struct ltc2983_data *st,
const struct ltc2983_sensor *sensor)
{
struct ltc2983_thermistor *thermistor;
struct device *dev = &st->spi->dev;
struct fwnode_handle *ref;
u32 excitation_current = 0;
int ret = 0;
thermistor = devm_kzalloc(dev, sizeof(*thermistor), GFP_KERNEL);
if (!thermistor)
return ERR_PTR(-ENOMEM);
ref = fwnode_find_reference(child, "adi,rsense-handle", 0);
if (IS_ERR(ref)) {
dev_err(dev, "Property adi,rsense-handle missing or invalid");
return ERR_CAST(ref);
}
ret = fwnode_property_read_u32(ref, "reg", &thermistor->r_sense_chan);
if (ret) {
dev_err(dev, "rsense channel must be configured...\n");
goto fail;
}
if (fwnode_property_read_bool(child, "adi,single-ended")) {
thermistor->sensor_config = LTC2983_THERMISTOR_SGL(1);
} else if (fwnode_property_read_bool(child, "adi,rsense-share")) {
/* rotation is only possible if sharing rsense */
if (fwnode_property_read_bool(child, "adi,current-rotate"))
thermistor->sensor_config =
LTC2983_THERMISTOR_C_ROTATE(1);
else
thermistor->sensor_config =
LTC2983_THERMISTOR_R_SHARE(1);
}
/* validate channel index */
if (!(thermistor->sensor_config & LTC2983_THERMISTOR_DIFF_MASK) &&
sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
dev_err(&st->spi->dev,
"Invalid chann:%d for differential thermistor",
sensor->chan);
ret = -EINVAL;
goto fail;
}
/* check custom sensor */
if (sensor->type >= LTC2983_SENSOR_THERMISTOR_STEINHART) {
bool steinhart = false;
const char *propname;
if (sensor->type == LTC2983_SENSOR_THERMISTOR_STEINHART) {
steinhart = true;
propname = "adi,custom-steinhart";
} else {
propname = "adi,custom-thermistor";
}
thermistor->custom = __ltc2983_custom_sensor_new(st, child,
propname,
steinhart,
64, false);
if (IS_ERR(thermistor->custom)) {
ret = PTR_ERR(thermistor->custom);
goto fail;
}
}
/* set common parameters */
thermistor->sensor.fault_handler = ltc2983_common_fault_handler;
thermistor->sensor.assign_chan = ltc2983_thermistor_assign_chan;
ret = fwnode_property_read_u32(child, "adi,excitation-current-nanoamp",
&excitation_current);
if (ret) {
/* Auto range is not allowed for custom sensors */
if (sensor->type >= LTC2983_SENSOR_THERMISTOR_STEINHART)
/* default to 1uA */
thermistor->excitation_current = 0x03;
else
/* default to auto-range */
thermistor->excitation_current = 0x0c;
} else {
switch (excitation_current) {
case 0:
/* auto range */
if (sensor->type >=
LTC2983_SENSOR_THERMISTOR_STEINHART) {
dev_err(&st->spi->dev,
"Auto Range not allowed for custom sensors\n");
ret = -EINVAL;
goto fail;
}
thermistor->excitation_current = 0x0c;
break;
case 250:
thermistor->excitation_current = 0x01;
break;
case 500:
thermistor->excitation_current = 0x02;
break;
case 1000:
thermistor->excitation_current = 0x03;
break;
case 5000:
thermistor->excitation_current = 0x04;
break;
case 10000:
thermistor->excitation_current = 0x05;
break;
case 25000:
thermistor->excitation_current = 0x06;
break;
case 50000:
thermistor->excitation_current = 0x07;
break;
case 100000:
thermistor->excitation_current = 0x08;
break;
case 250000:
thermistor->excitation_current = 0x09;
break;
case 500000:
thermistor->excitation_current = 0x0a;
break;
case 1000000:
thermistor->excitation_current = 0x0b;
break;