* [PATCH v2 1/2] iio: temperature: Add support for LTC2983
@ 2019-09-17 14:21 Nuno Sá
2019-09-17 14:21 ` [PATCH v2 2/2] dt-bindings: iio: Add ltc2983 documentation Nuno Sá
0 siblings, 1 reply; 2+ messages in thread
From: Nuno Sá @ 2019-09-17 14:21 UTC (permalink / raw)
To: linux-iio, devicetree
Cc: jic23, knaack.h, lars, pmeerw, robh+dt, mark.rutland
The LTC2983 is a Multi-Sensor High Accuracy Digital Temperature
Measurement System. It measures a wide variety of temperature sensors and
digitally outputs the result, in °C or °F, with 0.1°C accuracy and
0.001°C resolution. It can measure the temperature of all standard
thermocouples (type B,E,J,K,N,S,R,T), standard 2-,3-,4-wire RTDs,
thermistors and diodes.
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
---
Changes in v2:
* Added some needed blank lines (for readability);
* Allocate iio_chan in the setup() function;
* Rename reset to sleep;
* Remove unneeded dev_dbg calls;
* Remove unneeded line wrapping;
* Remove unneeded comments;
* Remove extend_names. Use the standard ABI;
* Adapt the scales to report in millivolt and milli degrees;
* Adapt the of_property readings to the renaming of the properties;
* For custom thermistors, excitation-current cannot be set to Auto range.
MAINTAINERS | 7 +
drivers/iio/temperature/Kconfig | 10 +
drivers/iio/temperature/Makefile | 1 +
drivers/iio/temperature/ltc2983.c | 1436 +++++++++++++++++++++++++++++
4 files changed, 1454 insertions(+)
create mode 100644 drivers/iio/temperature/ltc2983.c
diff --git a/MAINTAINERS b/MAINTAINERS
index f0c03740b9fb..14a256e785ca 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9491,6 +9491,13 @@ S: Maintained
F: Documentation/devicetree/bindings/iio/dac/ltc1660.txt
F: drivers/iio/dac/ltc1660.c
+LTC2983 IIO TEMPERATURE DRIVER
+M: Nuno Sá <nuno.sa@analog.com>
+W: http://ez.analog.com/community/linux-device-drivers
+L: linux-iio@vger.kernel.org
+S: Supported
+F: drivers/iio/temperature/ltc2983.c
+
LTC4261 HARDWARE MONITOR DRIVER
M: Guenter Roeck <linux@roeck-us.net>
L: linux-hwmon@vger.kernel.org
diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig
index 737faa0901fe..04b5a67b593c 100644
--- a/drivers/iio/temperature/Kconfig
+++ b/drivers/iio/temperature/Kconfig
@@ -4,6 +4,16 @@
#
menu "Temperature sensors"
+config LTC2983
+ tristate "Analog Devices Multi-Sensor Digital Temperature Measurement System"
+ depends on SPI
+ help
+ Say yes here to build support for the LTC2983 Multi-Sensor
+ high accuracy digital temperature measurement system.
+
+ To compile this driver as a module, choose M here: the module
+ will be called ltc2983.
+
config MAXIM_THERMOCOUPLE
tristate "Maxim thermocouple sensors"
depends on SPI
diff --git a/drivers/iio/temperature/Makefile b/drivers/iio/temperature/Makefile
index baca4776ca0d..d6b850b0cf63 100644
--- a/drivers/iio/temperature/Makefile
+++ b/drivers/iio/temperature/Makefile
@@ -3,6 +3,7 @@
# Makefile for industrial I/O temperature drivers
#
+obj-$(CONFIG_LTC2983) += ltc2983.o
obj-$(CONFIG_HID_SENSOR_TEMP) += hid-sensor-temperature.o
obj-$(CONFIG_MAXIM_THERMOCOUPLE) += maxim_thermocouple.o
obj-$(CONFIG_MAX31856) += max31856.o
diff --git a/drivers/iio/temperature/ltc2983.c b/drivers/iio/temperature/ltc2983.c
new file mode 100644
index 000000000000..7c159da9f183
--- /dev/null
+++ b/drivers/iio/temperature/ltc2983.c
@@ -0,0 +1,1436 @@
+// 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/module.h>
+#include <linux/of_gpio.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.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_THERMISTOR_DIFF_MASK BIT(2)
+#define LTC2983_DIODE_DIFF_MASK BIT(2)
+#define LTC2983_RTD_4_WIRE_MASK BIT(3)
+#define LTC2983_RTD_ROTATION_MASK BIT(1)
+#define LTC2983_RTD_KELVIN_R_SENSE_MASK GENMASK(3, 2)
+
+#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_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;
+ bool temp_farenheit;
+ bool sleep;
+};
+
+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 */
+ u8 *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 device_node *np,
+ const bool is_steinhart,
+ const u32 resolution,
+ const bool has_signed)
+{
+ struct ltc2983_custom_sensor *new_custom;
+ u8 index, n_entries, tbl = 0;
+ 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 == true) ? 4 : 3;
+
+ n_entries = of_property_count_elems_of_size(np, "adi,custom-sensor",
+ sizeof(u64));
+ /* 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 24",
+ new_custom->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 */
+ new_custom->table = devm_kzalloc(dev, new_custom->size, GFP_KERNEL);
+ if (!new_custom->table)
+ return ERR_PTR(-ENOMEM);
+
+ for (index = 0; index < n_entries; index++) {
+ u64 temp = 0, j;
+
+ of_property_read_u64_index(np, "adi,custom-sensor", index,
+ &temp);
+ /*
+ * Steinhart sensors are configured with raw values in the
+ * devicetree. For the other sensors we must convert the
+ * value to raw. The odd index's correspond to temperarures
+ * and always have 1/1024 of resolution. Temperatures also
+ * come in kelvin, so signed values is not possible
+ */
+ if (!is_steinhart) {
+ 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);
+ }
+
+ for (j = 0; j < n_size; j++)
+ new_custom->table[tbl++] =
+ temp >> (8 * (n_size - j - 1));
+ }
+
+ 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 device_node *child,
+ struct ltc2983_data *st,
+ const struct ltc2983_sensor *sensor)
+{
+ struct ltc2983_thermocouple *thermo;
+ struct device_node *phandle;
+
+ thermo = devm_kzalloc(&st->spi->dev, sizeof(*thermo), GFP_KERNEL);
+ if (!thermo)
+ return ERR_PTR(-ENOMEM);
+
+ of_property_read_u32(child, "adi,sensor-config",
+ &thermo->sensor_config);
+ /* 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);
+ }
+
+ phandle = of_parse_phandle(child, "adi,cold-junction-handle", 0);
+ if (phandle) {
+ int ret;
+
+ ret = of_property_read_u32(phandle, "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");
+ of_node_put(phandle);
+ return ERR_PTR(-EINVAL);
+ }
+ }
+
+ /* check custom sensor */
+ if (sensor->type == LTC2983_SENSOR_THERMOCOUPLE_CUSTOM) {
+ thermo->custom = __ltc2983_custom_sensor_new(st, child, false,
+ 16384, true);
+ if (IS_ERR(thermo->custom)) {
+ of_node_put(phandle);
+ return ERR_CAST(thermo->custom);
+ }
+ }
+
+ /* set common parameters */
+ thermo->sensor.fault_handler = ltc2983_thermocouple_fault_handler;
+ thermo->sensor.assign_chan = ltc2983_thermocouple_assign_chan;
+
+ of_node_put(phandle);
+ return &thermo->sensor;
+}
+
+static struct ltc2983_sensor *ltc2983_rtd_new(const struct device_node *child,
+ struct ltc2983_data *st,
+ const struct ltc2983_sensor *sensor)
+{
+ struct ltc2983_rtd *rtd;
+ int ret = 0;
+ struct device *dev = &st->spi->dev;
+ struct device_node *phandle;
+ u32 excitation_current = 0;
+
+ rtd = devm_kzalloc(dev, sizeof(*rtd), GFP_KERNEL);
+ if (!rtd)
+ return ERR_PTR(-ENOMEM);
+
+ phandle = of_parse_phandle(child, "adi,rsense-handle", 0);
+ if (!phandle) {
+ dev_err(dev, "Property adi,rsense-handle missing or invalid");
+ return ERR_PTR(-EINVAL);
+ }
+
+ ret = of_property_read_u32(phandle, "reg", &rtd->r_sense_chan);
+ if (ret) {
+ dev_err(dev, "Property reg must be given\n");
+ goto fail;
+ }
+
+ of_property_read_u32(child, "adi,sensor-config", &rtd->sensor_config);
+ /*
+ * 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, false,
+ 2048, false);
+ if (IS_ERR(rtd->custom)) {
+ of_node_put(phandle);
+ return ERR_CAST(rtd->custom);
+ }
+ }
+
+ /* set common parameters */
+ rtd->sensor.fault_handler = ltc2983_common_fault_handler;
+ rtd->sensor.assign_chan = ltc2983_rtd_assign_chan;
+
+ ret = of_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;
+ }
+ }
+
+ of_property_read_u32(child, "adi,rtd-curve", &rtd->rtd_curve);
+
+ of_node_put(phandle);
+ return &rtd->sensor;
+fail:
+ of_node_put(phandle);
+ return ERR_PTR(ret);
+}
+
+static struct ltc2983_sensor *ltc2983_thermistor_new(
+ const struct device_node *child,
+ struct ltc2983_data *st,
+ const struct ltc2983_sensor *sensor)
+{
+ struct ltc2983_thermistor *thermistor;
+ struct device *dev = &st->spi->dev;
+ struct device_node *phandle;
+ u32 excitation_current = 0;
+ int ret = 0;
+
+ thermistor = devm_kzalloc(dev, sizeof(*thermistor), GFP_KERNEL);
+ if (!thermistor)
+ return ERR_PTR(-ENOMEM);
+
+ phandle = of_parse_phandle(child, "adi,rsense-handle", 0);
+ if (!phandle) {
+ dev_err(dev, "Property adi,rsense-handle missing or invalid");
+ return ERR_PTR(-EINVAL);
+ }
+
+ ret = of_property_read_u32(phandle, "reg", &thermistor->r_sense_chan);
+ if (ret) {
+ dev_err(dev, "rsense channel must be configured...\n");
+ goto fail;
+ }
+
+ of_property_read_u32(child, "adi,sensor-config",
+ &thermistor->sensor_config);
+ /* 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) {
+ thermistor->custom = __ltc2983_custom_sensor_new(st, child,
+ sensor->type == LTC2983_SENSOR_THERMISTOR_STEINHART ?
+ true : false, 64,
+ false);
+ if (IS_ERR(thermistor->custom)) {
+ of_node_put(phandle);
+ return ERR_CAST(thermistor->custom);
+ }
+ }
+ /* set common parameters */
+ thermistor->sensor.fault_handler = ltc2983_common_fault_handler;
+ thermistor->sensor.assign_chan = ltc2983_thermistor_assign_chan;
+
+ ret = of_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;
+ default:
+ dev_err(&st->spi->dev,
+ "Invalid value for excitation current(%u)",
+ excitation_current);
+ ret = -EINVAL;
+ goto fail;
+ }
+ }
+
+ of_node_put(phandle);
+ return &thermistor->sensor;
+fail:
+ of_node_put(phandle);
+ return ERR_PTR(ret);
+}
+
+static struct ltc2983_sensor *ltc2983_diode_new(
+ const struct device_node *child,
+ const struct ltc2983_data *st,
+ const struct ltc2983_sensor *sensor)
+{
+ struct ltc2983_diode *diode;
+ u32 temp = 0, excitation_current = 0;
+ int ret;
+
+ diode = devm_kzalloc(&st->spi->dev, sizeof(*diode), GFP_KERNEL);
+ if (!diode)
+ return ERR_PTR(-ENOMEM);
+
+ of_property_read_u32(child, "adi,sensor-config", &diode->sensor_config);
+ /* validate channel index */
+ if (!(diode->sensor_config & LTC2983_DIODE_DIFF_MASK) &&
+ sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
+ dev_err(&st->spi->dev,
+ "Invalid chann:%d for differential thermistor",
+ sensor->chan);
+ return ERR_PTR(-EINVAL);
+ }
+ /* set common parameters */
+ diode->sensor.fault_handler = ltc2983_common_fault_handler;
+ diode->sensor.assign_chan = ltc2983_diode_assign_chan;
+
+ ret = of_property_read_u32(child, "adi,excitation-current-microamp",
+ &excitation_current);
+ if (!ret) {
+ switch (excitation_current) {
+ case 10:
+ diode->excitation_current = 0x00;
+ break;
+ case 20:
+ diode->excitation_current = 0x01;
+ break;
+ case 40:
+ diode->excitation_current = 0x02;
+ break;
+ case 80:
+ diode->excitation_current = 0x03;
+ break;
+ default:
+ dev_err(&st->spi->dev,
+ "Invalid value for excitation current(%u)",
+ excitation_current);
+ return ERR_PTR(-EINVAL);
+ }
+ }
+
+ of_property_read_u32(child, "adi,ideal-factor-value", &temp);
+
+ /* 2^20 resolution */
+ diode->ideal_factor_value = __convert_to_raw(temp, 1048576);
+
+ return &diode->sensor;
+}
+
+static struct ltc2983_sensor *ltc2983_r_sense_new(struct device_node *child,
+ struct ltc2983_data *st,
+ const struct ltc2983_sensor *sensor)
+{
+ struct ltc2983_rsense *rsense;
+ int ret;
+ u64 temp;
+
+ rsense = devm_kzalloc(&st->spi->dev, sizeof(*rsense), GFP_KERNEL);
+ if (!rsense)
+ return ERR_PTR(-ENOMEM);
+
+ /* validate channel index */
+ if (sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
+ dev_err(&st->spi->dev, "Invalid chann:%d for r_sense",
+ sensor->chan);
+ return ERR_PTR(-EINVAL);
+ }
+ /* get raw value */
+ ret = of_property_read_u64(child, "adi,rsense-val-micro-ohms", &temp);
+ if (ret) {
+ dev_err(&st->spi->dev, "Property adi,rsense-val-micro-ohms missing\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ /* 2^10 resolution */
+ rsense->r_sense_val = __convert_to_raw(temp, 1024);
+
+ /* set common parameters */
+ rsense->sensor.assign_chan = ltc2983_r_sense_assign_chan;
+
+ return &rsense->sensor;
+}
+
+static struct ltc2983_sensor *ltc2983_adc_new(struct device_node *child,
+ struct ltc2983_data *st,
+ const struct ltc2983_sensor *sensor)
+{
+ struct ltc2983_adc *adc;
+
+ adc = devm_kzalloc(&st->spi->dev, sizeof(*adc), GFP_KERNEL);
+ if (!adc)
+ return ERR_PTR(-ENOMEM);
+
+ if (of_property_read_bool(child, "adi,single-ended"))
+ adc->single_ended = true;
+
+ if (!adc->single_ended &&
+ sensor->chan < LTC2983_DIFFERENTIAL_CHAN_MIN) {
+ dev_err(&st->spi->dev, "Invalid chan:%d for differential adc\n",
+ sensor->chan);
+ return ERR_PTR(-EINVAL);
+ }
+ /* set common parameters */
+ adc->sensor.assign_chan = ltc2983_adc_assign_chan;
+ adc->sensor.fault_handler = ltc2983_common_fault_handler;
+
+ return &adc->sensor;
+}
+
+static int ltc2983_chan_read(struct ltc2983_data *st,
+ const struct ltc2983_sensor *sensor, int *val)
+{
+ u32 start_conversion = 0;
+ int ret;
+ unsigned long time;
+ __be32 temp;
+
+ /*
+ * Do not allow channel readings if device is in sleep state.
+ * A read/write on the spi bus would bring the device prematurely
+ * out of sleep.
+ */
+ if (st->sleep)
+ return -EPERM;
+
+ start_conversion = LTC2983_STATUS_START(true);
+ start_conversion |= LTC2983_STATUS_CHAN_SEL(sensor->chan);
+ dev_dbg(&st->spi->dev, "Start conversion on chan:%d, status:%02X\n",
+ sensor->chan, start_conversion);
+ /* start conversion */
+ ret = regmap_write(st->regmap, LTC2983_STATUS_REG, start_conversion);
+ if (ret)
+ return ret;
+
+ reinit_completion(&st->completion);
+ /*
+ * wait for conversion to complete.
+ * 300 ms should be more than enough to complete the conversion.
+ * Depending on the sensor configuration, there are 2/3 conversions
+ * cycles of 82ms.
+ */
+ time = wait_for_completion_timeout(&st->completion,
+ msecs_to_jiffies(300));
+ if (!time) {
+ dev_warn(&st->spi->dev, "Conversion timed out\n");
+ return -ETIMEDOUT;
+ }
+
+ /* read the converted data */
+ ret = regmap_bulk_read(st->regmap, LTC2983_CHAN_RES_ADDR(sensor->chan),
+ &temp, sizeof(temp));
+ if (ret)
+ return ret;
+
+ *val = __be32_to_cpu(temp);
+
+ if (!(LTC2983_RES_VALID_MASK & *val)) {
+ dev_err(&st->spi->dev, "Invalid conversion detected\n");
+ return -EIO;
+ }
+
+ ret = sensor->fault_handler(st, *val);
+ if (ret)
+ return ret;
+
+ *val = sign_extend32((*val) & LTC2983_DATA_MASK, LTC2983_DATA_SIGN_BIT);
+ return 0;
+}
+
+static int ltc2983_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct ltc2983_data *st = iio_priv(indio_dev);
+ int ret;
+
+ /* sanity check */
+ if (chan->address >= st->num_channels) {
+ dev_err(&st->spi->dev, "Invalid chan address:%ld",
+ chan->address);
+ return -EINVAL;
+ }
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ mutex_lock(&st->lock);
+ ret = ltc2983_chan_read(st, st->sensors[chan->address], val);
+ mutex_unlock(&st->lock);
+ return ret ?: IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_TEMP:
+ /* value in milli degrees */
+ *val = 1000;
+ /* 2^10 */
+ *val2 = 1024;
+ return IIO_VAL_FRACTIONAL;
+ case IIO_VOLTAGE:
+ /* value in millivolt */
+ *val = 1000;
+ /* 2^21 */
+ *val2 = 2097152;
+ return IIO_VAL_FRACTIONAL;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static int ltc2983_reg_access(struct iio_dev *indio_dev,
+ unsigned int reg,
+ unsigned int writeval,
+ unsigned int *readval)
+{
+ struct ltc2983_data *st = iio_priv(indio_dev);
+
+ /* check comment in ltc2983_chan_read() */
+ if (st->sleep)
+ return -EPERM;
+
+ if (readval)
+ return regmap_read(st->regmap, reg, readval);
+ else
+ return regmap_write(st->regmap, reg, writeval);
+}
+
+static irqreturn_t ltc2983_irq_handler(int irq, void *data)
+{
+ struct ltc2983_data *st = data;
+
+ complete(&st->completion);
+ return IRQ_HANDLED;
+}
+
+#define LTC2983_CHAN(__type, index, __address) ({ \
+ struct iio_chan_spec __chan = { \
+ .type = __type, \
+ .indexed = 1, \
+ .channel = index, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .address = __address, \
+ }; \
+ __chan; \
+})
+
+static int ltc2983_parse_dt(struct ltc2983_data *st)
+{
+ struct device_node *child;
+ struct device *dev = &st->spi->dev;
+ int ret = 0, chan = 0, channel_avail_mask = 0;
+
+ if (!of_property_read_bool(dev->of_node, "adi,temperature-celcius"))
+ st->temp_farenheit = true;
+
+ of_property_read_u32(dev->of_node, "adi,mux-delay-config-us",
+ &st->mux_delay_config);
+
+ of_property_read_u32(dev->of_node, "adi,filter-notch-freq",
+ &st->filter_notch_freq);
+
+ st->num_channels = of_get_available_child_count(dev->of_node);
+ st->sensors = devm_kcalloc(dev, st->num_channels, sizeof(*st->sensors),
+ GFP_KERNEL);
+ if (!st->sensors)
+ return -ENOMEM;
+
+ st->iio_channels = st->num_channels;
+ for_each_available_child_of_node(dev->of_node, child) {
+ struct ltc2983_sensor sensor;
+
+ ret = of_property_read_u32(child, "reg", &sensor.chan);
+ if (ret) {
+ dev_err(dev, "reg property must given for child nodes\n");
+ return ret;
+ }
+
+ /* check if we have a valid channel */
+ if (sensor.chan < LTC2983_MIN_CHANNELS_NR ||
+ sensor.chan > LTC2983_MAX_CHANNELS_NR) {
+ dev_err(dev,
+ "chan:%d must be from 1 to 20\n", sensor.chan);
+ return -EINVAL;
+ } else if (channel_avail_mask & BIT(sensor.chan)) {
+ dev_err(dev, "chan:%d already in use\n", sensor.chan);
+ return -EINVAL;
+ }
+
+ ret = of_property_read_u32(child, "adi,sensor-type",
+ &sensor.type);
+ if (ret) {
+ dev_err(dev,
+ "adi,sensor-type property must given for child nodes\n");
+ return ret;
+ }
+
+ dev_dbg(dev, "Create new sensor, type %u, chann %u",
+ sensor.type,
+ sensor.chan);
+
+ if (sensor.type >= LTC2983_SENSOR_THERMOCOUPLE &&
+ sensor.type <= LTC2983_SENSOR_THERMOCOUPLE_CUSTOM) {
+ st->sensors[chan] = ltc2983_thermocouple_new(child, st,
+ &sensor);
+ } else if (sensor.type >= LTC2983_SENSOR_RTD &&
+ sensor.type <= LTC2983_SENSOR_RTD_CUSTOM) {
+ st->sensors[chan] = ltc2983_rtd_new(child, st, &sensor);
+ } else if (sensor.type >= LTC2983_SENSOR_THERMISTOR &&
+ sensor.type <= LTC2983_SENSOR_THERMISTOR_CUSTOM) {
+ st->sensors[chan] = ltc2983_thermistor_new(child, st,
+ &sensor);
+ } else if (sensor.type == LTC2983_SENSOR_DIODE) {
+ st->sensors[chan] = ltc2983_diode_new(child, st,
+ &sensor);
+ } else if (sensor.type == LTC2983_SENSOR_SENSE_RESISTOR) {
+ st->sensors[chan] = ltc2983_r_sense_new(child, st,
+ &sensor);
+ /* don't add rsense to iio */
+ st->iio_channels--;
+ } else if (sensor.type == LTC2983_SENSOR_DIRECT_ADC) {
+ st->sensors[chan] = ltc2983_adc_new(child, st, &sensor);
+ } else {
+ dev_err(dev, "Unknown sensor type %d\n", sensor.type);
+ return -EINVAL;
+ }
+
+ if (IS_ERR(st->sensors[chan])) {
+ dev_err(dev, "Failed to create sensor %ld",
+ PTR_ERR(st->sensors[chan]));
+ return PTR_ERR(st->sensors[chan]);
+ }
+ /* set generic sensor parameters */
+ st->sensors[chan]->chan = sensor.chan;
+ st->sensors[chan]->type = sensor.type;
+
+ channel_avail_mask |= BIT(sensor.chan);
+ chan++;
+ }
+
+ return 0;
+}
+
+static int ltc2983_setup(struct ltc2983_data *st, bool assign_iio)
+{
+ u32 iio_chan_t = 0, iio_chan_v = 0, chan, iio_idx = 0;
+ u32 global_cfg = 0;
+ int ret;
+ unsigned long time;
+
+ /* make sure the device is up */
+ time = wait_for_completion_timeout(&st->completion,
+ msecs_to_jiffies(250));
+
+ if (!time) {
+ dev_err(&st->spi->dev, "Device startup timed out\n");
+ return -ETIMEDOUT;
+ }
+
+ st->iio_chan = devm_kzalloc(&st->spi->dev,
+ st->iio_channels * sizeof(*st->iio_chan),
+ GFP_KERNEL);
+
+ if (!st->iio_chan)
+ return -ENOMEM;
+
+ global_cfg = LTC2983_NOTCH_FREQ(st->filter_notch_freq);
+ global_cfg |= LTC2983_TEMP_UNITS(st->temp_farenheit);
+ regmap_write(st->regmap, LTC2983_GLOBAL_CONFIG_REG, global_cfg);
+ regmap_write(st->regmap, LTC2983_MUX_CONFIG_REG, st->mux_delay_config);
+
+ for (chan = 0; chan < st->num_channels; chan++) {
+ u32 chan_type = 0, *iio_chan;
+
+ ret = st->sensors[chan]->assign_chan(st, st->sensors[chan]);
+ if (ret)
+ return ret;
+ /*
+ * The assign_iio flag is necessary for when the device is
+ * coming out of sleep. In that case, we just need to
+ * re-configure the device channels.
+ * We also don't assign iio channels for rsense.
+ */
+ if (st->sensors[chan]->type == LTC2983_SENSOR_SENSE_RESISTOR ||
+ !assign_iio)
+ continue;
+
+ /* assign iio channel */
+ if (st->sensors[chan]->type != LTC2983_SENSOR_DIRECT_ADC) {
+ chan_type = IIO_TEMP;
+ iio_chan = &iio_chan_t;
+ } else {
+ chan_type = IIO_VOLTAGE;
+ iio_chan = &iio_chan_v;
+ }
+
+ /*
+ * add chan as the iio .address so that, we can directly
+ * reference the sensor given the iio_chan_spec
+ */
+ st->iio_chan[iio_idx++] = LTC2983_CHAN(chan_type, (*iio_chan)++,
+ chan);
+ }
+
+ return 0;
+}
+
+static const struct regmap_range ltc2983_reg_ranges[] = {
+ regmap_reg_range(LTC2983_STATUS_REG, LTC2983_STATUS_REG),
+ regmap_reg_range(LTC2983_TEMP_RES_START_REG, LTC2983_TEMP_RES_END_REG),
+ regmap_reg_range(LTC2983_GLOBAL_CONFIG_REG, LTC2983_GLOBAL_CONFIG_REG),
+ regmap_reg_range(LTC2983_MULT_CHANNEL_START_REG,
+ LTC2983_MULT_CHANNEL_END_REG),
+ regmap_reg_range(LTC2983_MUX_CONFIG_REG, LTC2983_MUX_CONFIG_REG),
+ regmap_reg_range(LTC2983_CHAN_ASSIGN_START_REG,
+ LTC2983_CHAN_ASSIGN_END_REG),
+ regmap_reg_range(LTC2983_CUST_SENS_TBL_START_REG,
+ LTC2983_CUST_SENS_TBL_END_REG),
+};
+
+static const struct regmap_access_table ltc2983_reg_table = {
+ .yes_ranges = ltc2983_reg_ranges,
+ .n_yes_ranges = ARRAY_SIZE(ltc2983_reg_ranges),
+};
+
+/*
+ * The reg_bits are actually 12 but the device needs the first *complete*
+ * byte for the command (R/W).
+ */
+static const struct regmap_config ltc2983_regmap_config = {
+ .reg_bits = 24,
+ .val_bits = 8,
+ .wr_table = <c2983_reg_table,
+ .rd_table = <c2983_reg_table,
+ .read_flag_mask = GENMASK(1, 0),
+ .write_flag_mask = BIT(1),
+};
+
+static const struct iio_info ltc2983_iio_info = {
+ .read_raw = ltc2983_read_raw,
+ .debugfs_reg_access = ltc2983_reg_access,
+};
+
+static int ltc2983_probe(struct spi_device *spi)
+{
+ struct ltc2983_data *st;
+ struct iio_dev *indio_dev;
+ const char *name = spi_get_device_id(spi)->name;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ st = iio_priv(indio_dev);
+
+ st->regmap = devm_regmap_init_spi(spi, <c2983_regmap_config);
+ if (IS_ERR(st->regmap)) {
+ dev_err(&spi->dev, "Failed to initialize regmap\n");
+ return PTR_ERR(st->regmap);
+ }
+
+ mutex_init(&st->lock);
+ init_completion(&st->completion);
+ st->spi = spi;
+ spi_set_drvdata(spi, st);
+
+ ret = ltc2983_parse_dt(st);
+ if (ret)
+ return ret;
+ /*
+ * let's request the irq now so it is used to sync the device
+ * startup in ltc2983_setup()
+ */
+ ret = devm_request_threaded_irq(&spi->dev, spi->irq, NULL,
+ ltc2983_irq_handler, IRQF_ONESHOT |
+ IRQF_TRIGGER_RISING, name, st);
+ if (ret) {
+ dev_err(&spi->dev, "failed to request an irq, %d", ret);
+ return ret;
+ }
+
+ ret = ltc2983_setup(st, true);
+ if (ret)
+ return ret;
+
+ indio_dev->dev.parent = &spi->dev;
+ indio_dev->name = name;
+ indio_dev->num_channels = st->iio_channels;
+ indio_dev->channels = st->iio_chan;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = <c2983_iio_info;
+
+ return devm_iio_device_register(&spi->dev, indio_dev);
+}
+
+static int __maybe_unused ltc2983_resume(struct device *dev)
+{
+ struct ltc2983_data *st = spi_get_drvdata(to_spi_device(dev));
+ int ret;
+
+ mutex_lock(&st->lock);
+ /* dummy read to bring the device out of sleep */
+ regmap_read(st->regmap, LTC2983_STATUS_REG, &ret);
+ /* we need to re-assign the channels */
+ ret = ltc2983_setup(st, false);
+ st->sleep = false;
+ mutex_unlock(&st->lock);
+
+ return ret;
+}
+
+static int __maybe_unused ltc2983_suspend(struct device *dev)
+{
+ struct ltc2983_data *st = spi_get_drvdata(to_spi_device(dev));
+ int ret;
+
+ mutex_lock(&st->lock);
+ ret = regmap_write(st->regmap, LTC2983_STATUS_REG, LTC2983_SLEEP);
+ st->sleep = true;
+ mutex_unlock(&st->lock);
+
+ return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(ltc2983_pm_ops, ltc2983_suspend, ltc2983_resume);
+
+static const struct spi_device_id ltc2983_id_table[] = {
+ { "ltc2983" },
+ {},
+};
+MODULE_DEVICE_TABLE(spi, ltc2983_id_table);
+
+static const struct of_device_id ltc2983_of_match[] = {
+ { .compatible = "adi,ltc2983" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ltc2983_id_table);
+
+static struct spi_driver ltc2983_driver = {
+ .driver = {
+ .name = "ltc2983",
+ .of_match_table = ltc2983_of_match,
+ .pm = <c2983_pm_ops,
+ },
+ .probe = ltc2983_probe,
+ .id_table = ltc2983_id_table,
+};
+
+module_spi_driver(ltc2983_driver);
+
+MODULE_AUTHOR("Nuno Sa <nuno.sa@analog.com>");
+MODULE_DESCRIPTION("Analog Devices LTC2983 SPI Temperature sensors");
+MODULE_LICENSE("GPL");
--
2.23.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH v2 2/2] dt-bindings: iio: Add ltc2983 documentation
2019-09-17 14:21 [PATCH v2 1/2] iio: temperature: Add support for LTC2983 Nuno Sá
@ 2019-09-17 14:21 ` Nuno Sá
0 siblings, 0 replies; 2+ messages in thread
From: Nuno Sá @ 2019-09-17 14:21 UTC (permalink / raw)
To: linux-iio, devicetree
Cc: jic23, knaack.h, lars, pmeerw, robh+dt, mark.rutland
Document the LTC2983 temperature sensor devicetree bindings.
Signed-off-by: Nuno Sá <nuno.sa@analog.com>
---
Changes in v2:
* Drop maxItems in non-array elements;
* Set adi,mux-delay-config-us instead of adi,mux-delay-config;
* Wrapped lines at 80 char;
* Added comas to enum elements;
* Use real units in adi,excitation-current;
* Moved some enums to minimum and maximum;
* Grouped patternProperties and moved reg property as a generic property.
.../bindings/iio/temperature/adi,ltc2983.yaml | 406 ++++++++++++++++++
MAINTAINERS | 1 +
2 files changed, 407 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml
diff --git a/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml b/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml
new file mode 100644
index 000000000000..df68b8233e5e
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml
@@ -0,0 +1,406 @@
+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/temperature/adi,ltc2983.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices LTC2983 Multi-sensor Temperature system
+
+maintainers:
+ - Nuno Sá <nuno.sa@analog.com>
+
+description: |
+ Analog Devices LTC2983 Multi-Sensor Digital Temperature Measurement System
+ https://www.analog.com/media/en/technical-documentation/data-sheets/2983fc.pdf
+
+properties:
+ compatible:
+ enum:
+ - adi,ltc2983
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ adi,temperature-celcius:
+ description:
+ If this property is present, the temperature is reported in Celsius.
+ type: boolean
+
+ adi,mux-delay-config-us:
+ description:
+ The LTC2983 performs 2 or 3 internal conversion cycles per temperature
+ result. Each conversion cycle is performed with different excitation and
+ input multiplexer configurations. Prior to each conversion, these
+ excitation circuits and input switch configurations are changed and an
+ internal 1ms delay ensures settling prior to the conversion cycle in most
+ cases. An extra delay can be configured using this property. The value is
+ rounded to nearest 100us.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - maximum: 255
+
+ adi,filter-notch-freq:
+ description:
+ Set's the default setting of the digital filter. The default is
+ simultaneous 50/60Hz rejection.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 0
+ - maximum: 2
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
+patternProperties:
+ ".*@([1-9]|1[0-9]|20)$":
+ type: object
+
+ properties:
+ reg:
+ description: |
+ The channel number. It can be connected to one of the 20 channels of
+ the device.
+ minimum: 1
+ maximum: 20
+
+ required:
+ - reg
+
+ patternProperties:
+ "^thermocouple@.*":
+ type: object
+ description: |
+ Represents a thermocouple sensor which is connected to one of the device
+ channels.
+
+ properties:
+ adi,sensor-type:
+ description: |
+ Identifies the type of thermocouple connected to the device.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 1
+ - maximum: 8
+
+ adi,sensor-config:
+ description: |
+ Raw value which set's the sensor configuration. Look at table 14
+ of the datasheet for how to set this value for thermocouples.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 1
+ - maximun: 15
+
+ adi,cold-junction-handle:
+ description: |
+ Phandle which points to a sensor object responsible for measuring
+ the thermocouple cold junction temperature.
+ $ref: "/schemas/types.yaml#/definitions/phandle"
+
+ adi,custom-sensor:
+ description: |
+ This is a table, where each entry should be a pair of
+ voltage(mv)-temperature(K). The entries must be given in nv and uK
+ so that, the original values must be multiplied by 1000000. For
+ more details look at table 69 and 70.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/int64-array
+ - minItems: 6
+ - maxItems: 128
+
+ required:
+ - adi,sensor-type
+
+ "^diode@.*":
+ type: object
+ description: |
+ Represents a diode sensor which is connected to one of the device
+ channels.
+
+ properties:
+ adi,sensor-type:
+ description: Identifies the sensor as a diode.
+ const: 28
+
+ adi,sensor-config:
+ description: |
+ Raw value which set's the sensor configuration. Look at table 17
+ of the datasheet for how to set this value for diodes.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 0
+ - maximum: 7
+
+ adi,excitation-current-microamp:
+ description: |
+ This property controls the magnitude of the excitation current
+ applied to the diode. Depending on the number of conversions
+ cycles, this property will assume different predefined values on
+ each cycle. Just set the value of the first cycle (1l).
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [10, 20, 40, 80]
+
+ adi,ideal-factor-value:
+ description: |
+ This property sets the diode ideality factor. The real value must
+ be multiplied by 1000000 to remove the fractional part. For more
+ information look at table 20 of the datasheet.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+
+ required:
+ - adi,sensor-type
+
+ "^rtd@.*":
+ type: object
+ description: |
+ Represents a rtd sensor which is connected to one of the device channels.
+
+ properties:
+ reg:
+ minimum: 2
+
+ adi,sensor-type:
+ description: Identifies the type of RTD connected to the device.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 10
+ - maximum: 17
+
+ adi,rsense-handle:
+ description: |
+ Phandle pointing to a rsense object associated with this RTD.
+ $ref: "/schemas/types.yaml#/definitions/phandle"
+
+ adi,sensor-config:
+ description: |
+ Raw value which set's the sensor configuration. Look at table 28
+ of the datasheet for how to set this value for RTD's.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [0, 1, 4, 5, 8, 9, 10, 12, 13, 14]
+
+ adi,excitation-current-microamp:
+ description: |
+ This property controls the magnitude of the excitation current
+ applied to the RTD.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [5, 10, 25, 50, 100, 250, 500, 1000]
+
+ adi,rtd-curve:
+ description: |
+ This property set the RTD curve used and the corresponding
+ Callendar-VanDusen constants. Look at table 30 of the datasheet.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 0
+ - maximum: 3
+
+ adi,custom-sensor:
+ description: |
+ This is a table, where each entry should be a pair of
+ resistance(ohm)-temperature(K). The entries added here are in uohm
+ and uK. For more details values look at table 74 and 75.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint64-array
+ - minItems: 6
+ - maxItems: 128
+
+ required:
+ - adi,sensor-type
+ - adi,rsense-handle
+
+ "^thermistor@.*":
+ type: object
+ description: |
+ Represents a thermistor sensor which is connected to one of the device
+ channels.
+
+ properties:
+ adi,sensor-type:
+ description: |
+ Identifies the type of thermistor connected to the
+ device.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 19
+ - maximum: 25
+
+ adi,rsense-handle:
+ description: |
+ Phandle pointing to a rsense object associated with this
+ thermistor.
+ $ref: "/schemas/types.yaml#/definitions/phandle"
+
+ adi,sensor-config:
+ description: |
+ Raw value which set's the sensor configuration. Look at table 52
+ of the datasheet for how to set this value for thermistors.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - minimum: 0
+ - maximum: 4
+
+ adi,excitation-current-nanoamp:
+ description: |
+ This property controls the magnitude of the excitation current
+ applied to the thermistor. Value 0 set's the sensor in auto-range
+ mode.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ - enum: [0, 250, 500, 1000, 5000, 10000, 25000, 50000, 100000,
+ 250000, 500000, 1000000]
+
+ adi,custom-sensor:
+ description: |
+ This is a table, where each entry should be a pair of
+ resistance(ohm)-temperature(K). The entries added here are in uohm
+ and uK only for custom thermistors. For more details look at table
+ 78 and 79. Steinhart-Hart coefficients are also supported and can
+ be programmed into the device memory using this property. For
+ Steinhart sensors, this table has a constant size of 6 entries
+ (defining the coefficients) and the values are given in the raw
+ format. Look at table 82 for more information.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint64-array
+ - minItems: 6
+ - maxItems: 128
+
+ required:
+ - adi,sensor-type
+ - adi,rsense-handle
+
+ "^adc@.*":
+ type: object
+ description: Represents a channel which is being used as a direct adc.
+
+ properties:
+ adi,sensor-type:
+ description: Identifies the sensor as a direct adc.
+ const: 30
+
+ adi,single-ended:
+ description: Boolean property which set's the adc as single-ended.
+ type: boolean
+
+ required:
+ - adi,sensor-type
+
+ "^rsense@.*":
+ type: object
+ description: |
+ Represents a rsense which is connected to one of the device channels.
+ Rsense are used by thermistors and RTD's.
+
+ properties:
+ reg:
+ minimum: 2
+
+ adi,sensor-type:
+ description: Identifies the sensor as a rsense.
+ const: 29
+
+ adi,rsense-val-micro-ohms:
+ description: |
+ Sets the value of the sense resistor. Look at table 20 of the
+ datasheet for information.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint64
+
+ required:
+ - adi,sensor-type
+ - adi, rsense-val
+
+required:
+ - compatible
+ - reg
+ - interrupts
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/irq.h>
+ spi0 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ sensor_ltc2983: ltc2983@0 {
+ compatible = "adi,ltc2983";
+ reg = <0>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ adi,temperature-celcius;
+ interrupts = <20 IRQ_TYPE_EDGE_RISING>;
+ interrupt-parent = <&gpio>;
+
+ thermocouple@18 {
+ reg = <18>;
+ adi,sensor-type = <8>; //Type B
+ adi,sensor-config = <1>; //Differential, open-circuit current
+ adi,cold-junction-handle = <&diode5>;
+ };
+
+ diode5: diode@5 {
+ reg = <5>;
+ adi,sensor-type = <28>;
+ };
+
+ rsense2: rsense@2 {
+ reg = <2>;
+ adi,sensor-type = <29>;
+ adi,rsense-val-micro-ohms = /bits/ 64 <1200000000>; //1.2Kohms
+ };
+
+ rtd@14 {
+ reg = <14>;
+ adi,sensor-type = <15>; //PT1000
+ /*2-wire, internal gnd, no current rotation*/
+ adi,sensor-config = <1>;
+ adi,excitation-current = <7>; //500uA
+ adi,rsense-handle = <&rsense2>;
+ };
+
+ adc@10 {
+ reg = <10>;
+ adi,sensor-type = <30>;
+ adi,single-ended;
+ };
+
+ thermistor@12 {
+ reg = <12>;
+ adi,sensor-type = <26>; //Steinhart
+ adi,rsense-handle = <&rsense2>;
+ adi,custom-sensor = /bits/ 64 <0x00F371EC 0x12345678
+ 0x2C0F8733 0x10018C66 0xA0FEACCD
+ 0x90021D99>; //6 entries
+ };
+
+ thermocouple@20 {
+ reg = <20>;
+ adi,sensor-type = <9>; //custom thermocouple
+ adi,sensor-config = <8>; //single-ended
+ adi,custom-sensor = /bits/ 64
+ <(-50220000) 0
+ (-30200000) 99100000
+ (-5300000) 135400000
+ 0 273150000
+ 40200000 361200000
+ 55300000 522100000
+ 88300000 720300000
+ 132200000 811200000
+ 188700000 922500000
+ 460400000 1000000000>; //10 pairs
+ };
+
+ };
+ };
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index 14a256e785ca..f747a9dc27f5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9497,6 +9497,7 @@ W: http://ez.analog.com/community/linux-device-drivers
L: linux-iio@vger.kernel.org
S: Supported
F: drivers/iio/temperature/ltc2983.c
+F: Documentation/devicetree/bindings/iio/temperature/adi,ltc2983.yaml
LTC4261 HARDWARE MONITOR DRIVER
M: Guenter Roeck <linux@roeck-us.net>
--
2.23.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
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