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Message-ID: <20231117164232.8474-2-petre.rodan@subdimension.ro>
Date: Fri, 17 Nov 2023 18:42:06 +0200
From: Petre Rodan <petre.rodan@...dimension.ro>
To: petre.rodan@...dimension.ro, linux-kernel@...r.kernel.org,
linux-iio@...r.kernel.org
Cc: Jonathan Cameron <jic23@...nel.org>,
Lars-Peter Clausen <lars@...afoo.de>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Angel Iglesias <ang.iglesiasg@...il.com>,
Matti Vaittinen <mazziesaccount@...il.com>,
Andreas Klinger <ak@...klinger.de>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Subject: [PATCH 2/2] iio: pressure: driver for Honeywell HSC/SSC series pressure sensors
Adds driver for Honeywell TruStability HSC and SSC series pressure and
temperature sensors.
Covers i2c and spi-based interfaces. For both series it supports all the
combinations of four transfer functions and all 118 pressure ranges.
In case of a special chip not covered by the nomenclature a custom range
can be specified.
Devices tested:
HSCMLNN100PASA3 (SPI sensor)
HSCMRNN030PA2A3 (i2c sensor)
Datasheet:
[HSC] https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/trustability-hsc-series/documents/sps-siot-trustability-hsc-series-high-accuracy-board-mount-pressure-sensors-50099148-a-en-ciid-151133.pdf
[SSC] https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/trustability-ssc-series/documents/sps-siot-trustability-ssc-series-standard-accuracy-board-mount-pressure-sensors-50099533-a-en-ciid-151134.pdf
[i2c comms] https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/common/documents/sps-siot-i2c-comms-digital-output-pressure-sensors-tn-008201-3-en-ciid-45841.pdf
Signed-off-by: Petre Rodan <petre.rodan@...dimension.ro>
---
MAINTAINERS | 7 +
drivers/iio/pressure/Kconfig | 22 ++
drivers/iio/pressure/Makefile | 3 +
drivers/iio/pressure/hsc030pa.c | 402 ++++++++++++++++++++++++++++
drivers/iio/pressure/hsc030pa.h | 59 ++++
drivers/iio/pressure/hsc030pa_i2c.c | 136 ++++++++++
drivers/iio/pressure/hsc030pa_spi.c | 129 +++++++++
7 files changed, 758 insertions(+)
create mode 100644 drivers/iio/pressure/hsc030pa.c
create mode 100644 drivers/iio/pressure/hsc030pa.h
create mode 100644 drivers/iio/pressure/hsc030pa_i2c.c
create mode 100644 drivers/iio/pressure/hsc030pa_spi.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 482d428472e7..cba0d34c504a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9708,6 +9708,13 @@ S: Maintained
F: Documentation/devicetree/bindings/iio/pressure/honeywell,mprls0025pa.yaml
F: drivers/iio/pressure/mprls0025pa.c
+HONEYWELL HSC, SSC PRESSURE SENSOR SERIES IIO DRIVER
+M: Petre Rodan <petre.rodan@...dimension.ro>
+L: linux-iio@...r.kernel.org
+S: Maintained
+F: Documentation/devicetree/bindings/iio/pressure/honeywell,hsc030pa.yaml
+F: drivers/iio/pressure/hsc030pa*
+
HOST AP DRIVER
L: linux-wireless@...r.kernel.org
S: Obsolete
diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig
index 95efa32e4289..266688802fb3 100644
--- a/drivers/iio/pressure/Kconfig
+++ b/drivers/iio/pressure/Kconfig
@@ -109,6 +109,28 @@ config HP03
To compile this driver as a module, choose M here: the module
will be called hp03.
+config HSC030PA
+ tristate "Honeywell HSC/SSC (TruStability pressure sensors series)"
+ depends on (I2C || SPI_MASTER)
+ select HSC030PA_I2C if (I2C)
+ select HSC030PA_SPI if (SPI_MASTER)
+ help
+ Say Y here to build support for the Honeywell HSC and SSC TruStability
+ pressure and temperature sensor series.
+
+ To compile this driver as a module, choose M here: the module will be
+ called hsc030pa.
+
+config HSC030PA_I2C
+ tristate
+ depends on HSC030PA
+ depends on I2C
+
+config HSC030PA_SPI
+ tristate
+ depends on HSC030PA
+ depends on SPI_MASTER
+
config ICP10100
tristate "InvenSense ICP-101xx pressure and temperature sensor"
depends on I2C
diff --git a/drivers/iio/pressure/Makefile b/drivers/iio/pressure/Makefile
index 436aec7e65f3..b0f8b94662f2 100644
--- a/drivers/iio/pressure/Makefile
+++ b/drivers/iio/pressure/Makefile
@@ -15,6 +15,9 @@ obj-$(CONFIG_DPS310) += dps310.o
obj-$(CONFIG_IIO_CROS_EC_BARO) += cros_ec_baro.o
obj-$(CONFIG_HID_SENSOR_PRESS) += hid-sensor-press.o
obj-$(CONFIG_HP03) += hp03.o
+obj-$(CONFIG_HSC030PA) += hsc030pa.o
+obj-$(CONFIG_HSC030PA_I2C) += hsc030pa_i2c.o
+obj-$(CONFIG_HSC030PA_SPI) += hsc030pa_spi.o
obj-$(CONFIG_ICP10100) += icp10100.o
obj-$(CONFIG_MPL115) += mpl115.o
obj-$(CONFIG_MPL115_I2C) += mpl115_i2c.o
diff --git a/drivers/iio/pressure/hsc030pa.c b/drivers/iio/pressure/hsc030pa.c
new file mode 100644
index 000000000000..b6ddfef7ee28
--- /dev/null
+++ b/drivers/iio/pressure/hsc030pa.c
@@ -0,0 +1,402 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Honeywell TruStability HSC Series pressure/temperature sensor
+ *
+ * Copyright (c) 2023 Petre Rodan <petre.rodan@...dimension.ro>
+ *
+ * Datasheet: https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/trustability-hsc-series/documents/sps-siot-trustability-hsc-series-high-accuracy-board-mount-pressure-sensors-50099148-a-en-ciid-151133.pdf?download=false
+ */
+
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/init.h>
+#include <linux/math64.h>
+#include <linux/units.h>
+#include <linux/mod_devicetable.h>
+#include <linux/printk.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include "hsc030pa.h"
+
+struct hsc_func_spec {
+ u32 output_min;
+ u32 output_max;
+};
+
+static const struct hsc_func_spec hsc_func_spec[] = {
+ [HSC_FUNCTION_A] = {.output_min = 1638, .output_max = 14746}, // 10% - 90% of 2^14
+ [HSC_FUNCTION_B] = {.output_min = 819, .output_max = 15565}, // 5% - 95% of 2^14
+ [HSC_FUNCTION_C] = {.output_min = 819, .output_max = 13926}, // 5% - 85% of 2^14
+ [HSC_FUNCTION_F] = {.output_min = 655, .output_max = 15401}, // 4% - 94% of 2^14
+};
+
+// pressure range for current chip based on the nomenclature
+struct hsc_range_config {
+ char name[HSC_RANGE_STR_LEN]; // 5-char string that defines the range - ie "030PA"
+ s32 pmin; // minimal pressure in pascals
+ s32 pmax; // maximum pressure in pascals
+};
+
+// all min max limits have been converted to pascals
+// code generated by scripts/parse_variants_table.sh
+static const struct hsc_range_config hsc_range_config[] = {
+ {.name = "001BA", .pmin = 0, .pmax = 100000 },
+ {.name = "1.6BA", .pmin = 0, .pmax = 160000 },
+ {.name = "2.5BA", .pmin = 0, .pmax = 250000 },
+ {.name = "004BA", .pmin = 0, .pmax = 400000 },
+ {.name = "006BA", .pmin = 0, .pmax = 600000 },
+ {.name = "010BA", .pmin = 0, .pmax = 1000000 },
+ {.name = "1.6MD", .pmin = -160, .pmax = 160 },
+ {.name = "2.5MD", .pmin = -250, .pmax = 250 },
+ {.name = "004MD", .pmin = -400, .pmax = 400 },
+ {.name = "006MD", .pmin = -600, .pmax = 600 },
+ {.name = "010MD", .pmin = -1000, .pmax = 1000 },
+ {.name = "016MD", .pmin = -1600, .pmax = 1600 },
+ {.name = "025MD", .pmin = -2500, .pmax = 2500 },
+ {.name = "040MD", .pmin = -4000, .pmax = 4000 },
+ {.name = "060MD", .pmin = -6000, .pmax = 6000 },
+ {.name = "100MD", .pmin = -10000, .pmax = 10000 },
+ {.name = "160MD", .pmin = -16000, .pmax = 16000 },
+ {.name = "250MD", .pmin = -25000, .pmax = 25000 },
+ {.name = "400MD", .pmin = -40000, .pmax = 40000 },
+ {.name = "600MD", .pmin = -60000, .pmax = 60000 },
+ {.name = "001BD", .pmin = -100000, .pmax = 100000 },
+ {.name = "1.6BD", .pmin = -160000, .pmax = 160000 },
+ {.name = "2.5BD", .pmin = -250000, .pmax = 250000 },
+ {.name = "004BD", .pmin = -400000, .pmax = 400000 },
+ {.name = "2.5MG", .pmin = 0, .pmax = 250 },
+ {.name = "004MG", .pmin = 0, .pmax = 400 },
+ {.name = "006MG", .pmin = 0, .pmax = 600 },
+ {.name = "010MG", .pmin = 0, .pmax = 1000 },
+ {.name = "016MG", .pmin = 0, .pmax = 1600 },
+ {.name = "025MG", .pmin = 0, .pmax = 2500 },
+ {.name = "040MG", .pmin = 0, .pmax = 4000 },
+ {.name = "060MG", .pmin = 0, .pmax = 6000 },
+ {.name = "100MG", .pmin = 0, .pmax = 10000 },
+ {.name = "160MG", .pmin = 0, .pmax = 16000 },
+ {.name = "250MG", .pmin = 0, .pmax = 25000 },
+ {.name = "400MG", .pmin = 0, .pmax = 40000 },
+ {.name = "600MG", .pmin = 0, .pmax = 60000 },
+ {.name = "001BG", .pmin = 0, .pmax = 100000 },
+ {.name = "1.6BG", .pmin = 0, .pmax = 160000 },
+ {.name = "2.5BG", .pmin = 0, .pmax = 250000 },
+ {.name = "004BG", .pmin = 0, .pmax = 400000 },
+ {.name = "006BG", .pmin = 0, .pmax = 600000 },
+ {.name = "010BG", .pmin = 0, .pmax = 1000000 },
+ {.name = "100KA", .pmin = 0, .pmax = 100000 },
+ {.name = "160KA", .pmin = 0, .pmax = 160000 },
+ {.name = "250KA", .pmin = 0, .pmax = 250000 },
+ {.name = "400KA", .pmin = 0, .pmax = 400000 },
+ {.name = "600KA", .pmin = 0, .pmax = 600000 },
+ {.name = "001GA", .pmin = 0, .pmax = 1000000 },
+ {.name = "160LD", .pmin = -160, .pmax = 160 },
+ {.name = "250LD", .pmin = -250, .pmax = 250 },
+ {.name = "400LD", .pmin = -400, .pmax = 400 },
+ {.name = "600LD", .pmin = -600, .pmax = 600 },
+ {.name = "001KD", .pmin = -1000, .pmax = 1000 },
+ {.name = "1.6KD", .pmin = -1600, .pmax = 1600 },
+ {.name = "2.5KD", .pmin = -2500, .pmax = 2500 },
+ {.name = "004KD", .pmin = -4000, .pmax = 4000 },
+ {.name = "006KD", .pmin = -6000, .pmax = 6000 },
+ {.name = "010KD", .pmin = -10000, .pmax = 10000 },
+ {.name = "016KD", .pmin = -16000, .pmax = 16000 },
+ {.name = "025KD", .pmin = -25000, .pmax = 25000 },
+ {.name = "040KD", .pmin = -40000, .pmax = 40000 },
+ {.name = "060KD", .pmin = -60000, .pmax = 60000 },
+ {.name = "100KD", .pmin = -100000, .pmax = 100000 },
+ {.name = "160KD", .pmin = -160000, .pmax = 160000 },
+ {.name = "250KD", .pmin = -250000, .pmax = 250000 },
+ {.name = "400KD", .pmin = -400000, .pmax = 400000 },
+ {.name = "250LG", .pmin = 0, .pmax = 250 },
+ {.name = "400LG", .pmin = 0, .pmax = 400 },
+ {.name = "600LG", .pmin = 0, .pmax = 600 },
+ {.name = "001KG", .pmin = 0, .pmax = 1000 },
+ {.name = "1.6KG", .pmin = 0, .pmax = 1600 },
+ {.name = "2.5KG", .pmin = 0, .pmax = 2500 },
+ {.name = "004KG", .pmin = 0, .pmax = 4000 },
+ {.name = "006KG", .pmin = 0, .pmax = 6000 },
+ {.name = "010KG", .pmin = 0, .pmax = 10000 },
+ {.name = "016KG", .pmin = 0, .pmax = 16000 },
+ {.name = "025KG", .pmin = 0, .pmax = 25000 },
+ {.name = "040KG", .pmin = 0, .pmax = 40000 },
+ {.name = "060KG", .pmin = 0, .pmax = 60000 },
+ {.name = "100KG", .pmin = 0, .pmax = 100000 },
+ {.name = "160KG", .pmin = 0, .pmax = 160000 },
+ {.name = "250KG", .pmin = 0, .pmax = 250000 },
+ {.name = "400KG", .pmin = 0, .pmax = 400000 },
+ {.name = "600KG", .pmin = 0, .pmax = 600000 },
+ {.name = "001GG", .pmin = 0, .pmax = 1000000 },
+ {.name = "015PA", .pmin = 0, .pmax = 103425 },
+ {.name = "030PA", .pmin = 0, .pmax = 206850 },
+ {.name = "060PA", .pmin = 0, .pmax = 413700 },
+ {.name = "100PA", .pmin = 0, .pmax = 689500 },
+ {.name = "150PA", .pmin = 0, .pmax = 1034250 },
+ {.name = "0.5ND", .pmin = -125, .pmax = 125 },
+ {.name = "001ND", .pmin = -249, .pmax = 249 },
+ {.name = "002ND", .pmin = -498, .pmax = 498 },
+ {.name = "004ND", .pmin = -996, .pmax = 996 },
+ {.name = "005ND", .pmin = -1245, .pmax = 1245 },
+ {.name = "010ND", .pmin = -2491, .pmax = 2491 },
+ {.name = "020ND", .pmin = -4982, .pmax = 4982 },
+ {.name = "030ND", .pmin = -7473, .pmax = 7473 },
+ {.name = "001PD", .pmin = -6895, .pmax = 6895 },
+ {.name = "005PD", .pmin = -34475, .pmax = 34475 },
+ {.name = "015PD", .pmin = -103425, .pmax = 103425 },
+ {.name = "030PD", .pmin = -206850, .pmax = 206850 },
+ {.name = "060PD", .pmin = -413700, .pmax = 413700 },
+ {.name = "001NG", .pmin = 0, .pmax = 249 },
+ {.name = "002NG", .pmin = 0, .pmax = 498 },
+ {.name = "004NG", .pmin = 0, .pmax = 996 },
+ {.name = "005NG", .pmin = 0, .pmax = 1245 },
+ {.name = "010NG", .pmin = 0, .pmax = 2491 },
+ {.name = "020NG", .pmin = 0, .pmax = 4982 },
+ {.name = "030NG", .pmin = 0, .pmax = 7473 },
+ {.name = "001PG", .pmin = 0, .pmax = 6895 },
+ {.name = "005PG", .pmin = 0, .pmax = 34475 },
+ {.name = "015PG", .pmin = 0, .pmax = 103425 },
+ {.name = "030PG", .pmin = 0, .pmax = 206850 },
+ {.name = "060PG", .pmin = 0, .pmax = 413700 },
+ {.name = "100PG", .pmin = 0, .pmax = 689500 },
+ {.name = "150PG", .pmin = 0, .pmax = 1034250 }
+};
+
+/*
+ * the first two bits from the first byte contain a status code
+ *
+ * 00 - normal operation, valid data
+ * 01 - device in hidden factory command mode
+ * 10 - stale data
+ * 11 - diagnostic condition
+ *
+ * function returns 1 only if both bits are zero
+ */
+static bool hsc_measurement_is_valid(struct hsc_data *data)
+{
+ if (data->buffer[0] & 0xc0)
+ return 0;
+
+ return 1;
+}
+
+static int hsc_get_measurement(struct hsc_data *data)
+{
+ const struct hsc_chip_data *chip = data->chip;
+ int ret;
+
+ /* don't bother sensor more than once a second */
+ if (!time_after(jiffies, data->last_update + HZ))
+ return data->is_valid ? 0 : -EAGAIN;
+
+ data->is_valid = false;
+ data->last_update = jiffies;
+
+ ret = data->xfer(data);
+
+ if (ret < 0)
+ return ret;
+
+ ret = chip->valid(data);
+ if (!ret)
+ return -EAGAIN;
+
+ data->is_valid = true;
+
+ return 0;
+}
+
+/*
+ * 4 bytes are read, the dissection looks like
+ *
+ * . 0 . 1 . 2 . 3 . 4 . 5 . 6 . 7 .
+ * byte 0:
+ * | s1 | s0 | b13 | b12 | b11 | b10 | b9 | b8 |
+ * | status | bridge data (pressure) MSB |
+ * byte 1:
+ * | b7 | b6 | b5 | b4 | b3 | b2 | b1 | b0 |
+ * | bridge data (pressure) LSB |
+ * byte 2:
+ * | t10 | t9 | t8 | t7 | t6 | t5 | t4 | t3 |
+ * | temperature data MSB |
+ * byte 3:
+ * | t2 | t1 | t0 | X | X | X | X | X |
+ * | temperature LSB | ignore |
+ *
+ * . 0 . 1 . 2 . 3 . 4 . 5 . 6 . 7 .
+ */
+
+static int hsc_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *channel, int *val,
+ int *val2, long mask)
+{
+ struct hsc_data *data = iio_priv(indio_dev);
+ int ret = -EINVAL;
+
+ switch (mask) {
+
+ case IIO_CHAN_INFO_RAW:
+ mutex_lock(&data->lock);
+ ret = hsc_get_measurement(data);
+ mutex_unlock(&data->lock);
+
+ if (ret)
+ return ret;
+
+ switch (channel->type) {
+ case IIO_PRESSURE:
+ *val =
+ ((data->buffer[0] & 0x3f) << 8) + data->buffer[1];
+ return IIO_VAL_INT;
+ case IIO_TEMP:
+ *val =
+ (data->buffer[2] << 3) +
+ ((data->buffer[3] & 0xe0) >> 5);
+ ret = 0;
+ if (!ret)
+ return IIO_VAL_INT;
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+
+/**
+ * IIO ABI expects
+ * value = (conv + offset) * scale
+ *
+ * datasheet provides the following formula for determining the temperature
+ * temp[C] = conv * a + b
+ * where a = 200/2047; b = -50
+ *
+ * temp[C] = (conv + (b/a)) * a * (1000)
+ * =>
+ * scale = a * 1000 = .097703957 * 1000 = 97.703957
+ * offset = b/a = -50 / .097703957 = -50000000 / 97704
+ *
+ * based on the datasheet
+ * pressure = (conv - HSC_OUTPUT_MIN) * Q + Pmin =
+ * ((conv - HSC_OUTPUT_MIN) + Pmin/Q) * Q
+ * =>
+ * scale = Q = (Pmax - Pmin) / (HSC_OUTPUT_MAX - HSC_OUTPUT_MIN)
+ * offset = Pmin/Q = Pmin * (HSC_OUTPUT_MAX - HSC_OUTPUT_MIN) / (Pmax - Pmin)
+ */
+
+ case IIO_CHAN_INFO_SCALE:
+ switch (channel->type) {
+ case IIO_TEMP:
+ *val = 97;
+ *val2 = 703957;
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_PRESSURE:
+ *val = data->p_scale;
+ *val2 = data->p_scale_nano;
+ return IIO_VAL_INT_PLUS_NANO;
+ default:
+ return -EINVAL;
+ }
+ break;
+
+ case IIO_CHAN_INFO_OFFSET:
+ switch (channel->type) {
+ case IIO_TEMP:
+ *val = -50000000;
+ *val2 = 97704;
+ return IIO_VAL_FRACTIONAL;
+ case IIO_PRESSURE:
+ *val = data->p_offset;
+ *val2 = data->p_offset_nano;
+ return IIO_VAL_INT_PLUS_NANO;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return ret;
+}
+
+static const struct iio_chan_spec hsc_channels[] = {
+ {
+ .type = IIO_PRESSURE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_OFFSET)
+ },
+ {
+ .type = IIO_TEMP,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_OFFSET)
+ },
+};
+
+static const struct iio_info hsc_info = {
+ .read_raw = hsc_read_raw,
+};
+
+static const struct hsc_chip_data hsc_chip = {
+ .valid = hsc_measurement_is_valid,
+ .channels = hsc_channels,
+ .num_channels = ARRAY_SIZE(hsc_channels),
+};
+
+int hsc_probe(struct iio_dev *indio_dev, struct device *dev,
+ const char *name, int type)
+{
+ struct hsc_data *hsc;
+ u64 tmp;
+ int index;
+ int found = 0;
+
+ hsc = iio_priv(indio_dev);
+
+ hsc->last_update = jiffies - HZ;
+ hsc->chip = &hsc_chip;
+
+ if (strcasecmp(hsc->range_str, "na") != 0) {
+ // chip should be defined in the nomenclature
+ for (index = 0; index < ARRAY_SIZE(hsc_range_config); index++) {
+ if (strcasecmp
+ (hsc_range_config[index].name,
+ hsc->range_str) == 0) {
+ hsc->pmin = hsc_range_config[index].pmin;
+ hsc->pmax = hsc_range_config[index].pmax;
+ found = 1;
+ break;
+ }
+ }
+ if (hsc->pmin == hsc->pmax || !found)
+ return dev_err_probe(dev, -EINVAL,
+ "honeywell,range_str is invalid\n");
+ }
+
+ hsc->outmin = hsc_func_spec[hsc->function].output_min;
+ hsc->outmax = hsc_func_spec[hsc->function].output_max;
+
+ // multiply with MICRO and then divide by NANO since the output needs
+ // to be in KPa as per IIO ABI requirement
+ tmp = div_s64(((s64) (hsc->pmax - hsc->pmin)) * MICRO,
+ (hsc->outmax - hsc->outmin));
+ hsc->p_scale = div_s64_rem(tmp, NANO, &hsc->p_scale_nano);
+ tmp =
+ div_s64(((s64) hsc->pmin * (s64) (hsc->outmax - hsc->outmin)) *
+ MICRO, hsc->pmax - hsc->pmin);
+ hsc->p_offset =
+ div_s64_rem(tmp, NANO, &hsc->p_offset_nano) - hsc->outmin;
+
+ mutex_init(&hsc->lock);
+ indio_dev->name = name;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = &hsc_info;
+ indio_dev->channels = hsc->chip->channels;
+ indio_dev->num_channels = hsc->chip->num_channels;
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+EXPORT_SYMBOL_NS(hsc_probe, IIO_HONEYWELL_HSC);
+
+void hsc_remove(struct iio_dev *indio_dev)
+{
+ iio_device_unregister(indio_dev);
+}
+EXPORT_SYMBOL_NS(hsc_remove, IIO_HONEYWELL_HSC);
+
+MODULE_AUTHOR("Petre Rodan <petre.rodan@...dimension.ro>");
+MODULE_DESCRIPTION("Honeywell HSC and SSC pressure sensor core driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/pressure/hsc030pa.h b/drivers/iio/pressure/hsc030pa.h
new file mode 100644
index 000000000000..bc2a4877465b
--- /dev/null
+++ b/drivers/iio/pressure/hsc030pa.h
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Honeywell TruStability HSC Series pressure/temperature sensor
+ *
+ * Copyright (c) 2023 Petre Rodan <petre.rodan@...dimension.ro>
+ *
+ */
+
+#ifndef _HSC030PA_H
+#define _HSC030PA_H
+
+#define HSC_REG_MEASUREMENT_RD_SIZE 4 // get all conversions in one go since transfers are not address-based
+#define HSC_RANGE_STR_LEN 6
+
+struct hsc_chip_data;
+
+struct hsc_data {
+ void *client; // either i2c or spi kernel interface struct for current dev
+ const struct hsc_chip_data *chip;
+ struct mutex lock; // lock protecting chip reads
+ int (*xfer)(struct hsc_data *data); // function that implements the chip reads
+ bool is_valid; // false if last transfer has failed
+ unsigned long last_update; // time of last successful conversion
+ u8 buffer[HSC_REG_MEASUREMENT_RD_SIZE]; // raw conversion data
+ char range_str[HSC_RANGE_STR_LEN]; // range as defined by the chip nomenclature - ie "030PA" or "NA"
+ s32 pmin; // min pressure limit
+ s32 pmax; // max pressure limit
+ u32 outmin; // minimum raw pressure in counts (based on transfer function)
+ u32 outmax; // maximum raw pressure in counts (based on transfer function)
+ u32 function; // transfer function
+ s64 p_scale; // pressure scale
+ s32 p_scale_nano; // pressure scale, decimal places
+ s64 p_offset; // pressure offset
+ s32 p_offset_nano; // pressure offset, decimal places
+};
+
+struct hsc_chip_data {
+ bool (*valid)(struct hsc_data *data); // function that checks the two status bits
+ const struct iio_chan_spec *channels; // channel specifications
+ u8 num_channels; // pressure and temperature channels
+};
+
+enum hsc_func_id {
+ HSC_FUNCTION_A,
+ HSC_FUNCTION_B,
+ HSC_FUNCTION_C,
+ HSC_FUNCTION_F
+};
+
+enum hsc_variant {
+ HSC,
+ SSC
+};
+
+int hsc_probe(struct iio_dev *indio_dev, struct device *dev,
+ const char *name, int type);
+void hsc_remove(struct iio_dev *indio_dev);
+
+#endif
diff --git a/drivers/iio/pressure/hsc030pa_i2c.c b/drivers/iio/pressure/hsc030pa_i2c.c
new file mode 100644
index 000000000000..8d3fb174285a
--- /dev/null
+++ b/drivers/iio/pressure/hsc030pa_i2c.c
@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Honeywell TruStability HSC Series pressure/temperature sensor
+ *
+ * Copyright (c) 2023 Petre Rodan <petre.rodan@...dimension.ro>
+ *
+ * Datasheet: https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/trustability-hsc-series/documents/sps-siot-trustability-hsc-series-high-accuracy-board-mount-pressure-sensors-50099148-a-en-ciid-151133.pdf
+ * i2c-related datasheet: https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/common/documents/sps-siot-i2c-comms-digital-output-pressure-sensors-tn-008201-3-en-ciid-45841.pdf
+ */
+
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/regulator/consumer.h>
+#include <linux/iio/iio.h>
+#include "hsc030pa.h"
+
+static int hsc_i2c_xfer(struct hsc_data *data)
+{
+ struct i2c_client *client = data->client;
+ struct i2c_msg msg;
+ int ret;
+
+ msg.addr = client->addr;
+ msg.flags = client->flags | I2C_M_RD;
+ msg.len = HSC_REG_MEASUREMENT_RD_SIZE;
+ msg.buf = (char *)&data->buffer;
+
+ ret = i2c_transfer(client->adapter, &msg, 1);
+
+ return (ret == 2) ? 0 : ret;
+}
+
+static int hsc_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ struct iio_dev *indio_dev;
+ struct hsc_data *hsc;
+ const char *range_nom;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*hsc));
+ if (!indio_dev) {
+ dev_err(&client->dev, "Failed to allocate device\n");
+ return -ENOMEM;
+ }
+
+ hsc = iio_priv(indio_dev);
+
+ if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+ hsc->xfer = hsc_i2c_xfer;
+ else
+ return -EOPNOTSUPP;
+
+ ret = devm_regulator_get_enable_optional(dev, "vdd");
+ if (ret == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ if (!dev_fwnode(dev))
+ return -EOPNOTSUPP;
+
+ ret = device_property_read_u32(dev,
+ "honeywell,transfer-function",
+ &hsc->function);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "honeywell,transfer-function could not be read\n");
+ if (hsc->function > HSC_FUNCTION_F)
+ return dev_err_probe(dev, -EINVAL,
+ "honeywell,transfer-function %d invalid\n",
+ hsc->function);
+
+ ret = device_property_read_string(dev,
+ "honeywell,range_str", &range_nom);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "honeywell,range_str not defined\n");
+
+ memcpy(hsc->range_str, range_nom, HSC_RANGE_STR_LEN - 1);
+ hsc->range_str[HSC_RANGE_STR_LEN - 1] = 0;
+
+ if (strcasecmp(hsc->range_str, "na") == 0) {
+ // "not available"
+ // we got a custom-range chip not covered by the nomenclature
+ ret = device_property_read_u32(dev,
+ "honeywell,pmin-pascal",
+ &hsc->pmin);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "honeywell,pmin-pascal could not be read\n");
+ ret = device_property_read_u32(dev,
+ "honeywell,pmax-pascal",
+ &hsc->pmax);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "honeywell,pmax-pascal could not be read\n");
+ }
+
+ i2c_set_clientdata(client, indio_dev);
+ hsc->client = client;
+
+ return hsc_probe(indio_dev, &client->dev, id->name, id->driver_data);
+}
+
+static const struct of_device_id hsc_i2c_match[] = {
+ {.compatible = "honeywell,hsc",},
+ {.compatible = "honeywell,ssc",},
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, hsc_i2c_match);
+
+static const struct i2c_device_id hsc_i2c_id[] = {
+ {"hsc", HSC},
+ {"ssc", SSC},
+ {}
+};
+
+MODULE_DEVICE_TABLE(i2c, hsc_i2c_id);
+
+static struct i2c_driver hsc_i2c_driver = {
+ .driver = {
+ .name = "honeywell_hsc",
+ .of_match_table = hsc_i2c_match,
+ },
+ .probe = hsc_i2c_probe,
+ .id_table = hsc_i2c_id,
+};
+
+module_i2c_driver(hsc_i2c_driver);
+
+MODULE_AUTHOR("Petre Rodan <petre.rodan@...dimension.ro>");
+MODULE_DESCRIPTION("Honeywell HSC and SSC pressure sensor i2c driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(IIO_HONEYWELL_HSC);
diff --git a/drivers/iio/pressure/hsc030pa_spi.c b/drivers/iio/pressure/hsc030pa_spi.c
new file mode 100644
index 000000000000..e7a9b64ac84b
--- /dev/null
+++ b/drivers/iio/pressure/hsc030pa_spi.c
@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Honeywell TruStability HSC Series pressure/temperature sensor
+ *
+ * Copyright (c) 2023 Petre Rodan <petre.rodan@...dimension.ro>
+ *
+ * Datasheet: https://prod-edam.honeywell.com/content/dam/honeywell-edam/sps/siot/en-us/products/sensors/pressure-sensors/board-mount-pressure-sensors/trustability-hsc-series/documents/sps-siot-trustability-hsc-series-high-accuracy-board-mount-pressure-sensors-50099148-a-en-ciid-151133.pdf
+ */
+
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+#include <linux/iio/iio.h>
+#include <linux/regulator/consumer.h>
+#include "hsc030pa.h"
+
+static int hsc_spi_xfer(struct hsc_data *data)
+{
+ struct spi_transfer xfer = {
+ .tx_buf = NULL,
+ .rx_buf = (char *)&data->buffer,
+ .len = HSC_REG_MEASUREMENT_RD_SIZE,
+ };
+ int ret;
+
+ ret = spi_sync_transfer(data->client, &xfer, 1);
+
+ return ret;
+}
+
+static int hsc_spi_probe(struct spi_device *spi)
+{
+ struct iio_dev *indio_dev;
+ struct hsc_data *hsc;
+ const char *range_nom;
+ int ret;
+ struct device *dev = &spi->dev;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*hsc));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ spi_set_drvdata(spi, indio_dev);
+
+ spi->mode = SPI_MODE_0;
+ spi->max_speed_hz = min(spi->max_speed_hz, 800000U);
+ spi->bits_per_word = 8;
+ ret = spi_setup(spi);
+ if (ret < 0)
+ return ret;
+
+ hsc = iio_priv(indio_dev);
+ hsc->xfer = hsc_spi_xfer;
+ hsc->client = spi;
+
+ ret = devm_regulator_get_enable_optional(dev, "vdd");
+ if (ret == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ ret = device_property_read_u32(dev,
+ "honeywell,transfer-function",
+ &hsc->function);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "honeywell,transfer-function could not be read\n");
+ if (hsc->function > HSC_FUNCTION_F)
+ return dev_err_probe(dev, -EINVAL,
+ "honeywell,transfer-function %d invalid\n",
+ hsc->function);
+
+ ret =
+ device_property_read_string(dev, "honeywell,range_str", &range_nom);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "honeywell,range_str not defined\n");
+
+ // minimal input sanitization
+ memcpy(hsc->range_str, range_nom, HSC_RANGE_STR_LEN - 1);
+ hsc->range_str[HSC_RANGE_STR_LEN - 1] = 0;
+
+ if (strcasecmp(hsc->range_str, "na") == 0) {
+ // range string "not available"
+ // we got a custom chip not covered by the nomenclature with a custom range
+ ret = device_property_read_u32(dev, "honeywell,pmin-pascal",
+ &hsc->pmin);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "honeywell,pmin-pascal could not be read\n");
+ ret = device_property_read_u32(dev, "honeywell,pmax-pascal",
+ &hsc->pmax);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "honeywell,pmax-pascal could not be read\n");
+ }
+
+ return hsc_probe(indio_dev, &spi->dev, spi_get_device_id(spi)->name,
+ spi_get_device_id(spi)->driver_data);
+}
+
+static const struct of_device_id hsc_spi_match[] = {
+ {.compatible = "honeywell,hsc",},
+ {.compatible = "honeywell,ssc",},
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, hsc_spi_match);
+
+static const struct spi_device_id hsc_spi_id[] = {
+ {"hsc", HSC},
+ {"ssc", SSC},
+ {}
+};
+
+MODULE_DEVICE_TABLE(spi, hsc_spi_id);
+
+static struct spi_driver hsc_spi_driver = {
+ .driver = {
+ .name = "honeywell_hsc",
+ .of_match_table = hsc_spi_match,
+ },
+ .probe = hsc_spi_probe,
+ .id_table = hsc_spi_id,
+};
+
+module_spi_driver(hsc_spi_driver);
+
+MODULE_AUTHOR("Petre Rodan <petre.rodan@...dimension.ro>");
+MODULE_DESCRIPTION("Honeywell HSC and SSC pressure sensor spi driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(IIO_HONEYWELL_HSC);
--
2.41.0
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