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Sat, 30 May 2026 13:55:06 -0700 (PDT) From: Wadim Mueller To: Jonathan Cameron , Krzysztof Kozlowski , Rob Herring , Conor Dooley , David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko , Maxwell Doose , linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org Cc: devicetree@vger.kernel.org Subject: [PATCH v3 3/3] iio: flow: add Sensirion SLF3S liquid flow sensor driver Date: Sat, 30 May 2026 22:54:32 +0200 Message-ID: <20260530205435.37326-4-wafgo01@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260530205435.37326-1-wafgo01@gmail.com> References: <20260530205435.37326-1-wafgo01@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add a driver for the Sensirion SLF3S family of digital liquid-flow sensors on I2C. Currently supported variants are SLF3S-0600F, SLF3S-1300F and SLF3S-4000B; they share the same register map and differ only in flow-scale factor and calibrated measurement range. The variant (and therefore the scale) is auto-detected from the product-information register at probe time. Each measurement frame returns a 16-bit signed flow value, a 16-bit signed temperature reading and a status word, each protected by a CRC-8 byte. The driver exposes the flow rate as IIO_VOLUMEFLOW and the temperature as IIO_TEMP via the standard IIO read_raw / read_scale interface. The active calibration medium can be switched at runtime between the factory-calibrated water and isopropyl-alcohol modes via the in_volumeflow_medium sysfs attribute; the sensor starts in water mode after probe. This driver also creates the drivers/iio/flow/ subdirectory and the corresponding Kconfig/Makefile glue. Signed-off-by: Wadim Mueller --- drivers/iio/Kconfig | 1 + drivers/iio/Makefile | 1 + drivers/iio/flow/Kconfig | 27 +++ drivers/iio/flow/Makefile | 7 + drivers/iio/flow/slf3s.c | 406 ++++++++++++++++++++++++++++++++++++++ 5 files changed, 442 insertions(+) create mode 100644 drivers/iio/flow/Kconfig create mode 100644 drivers/iio/flow/Makefile create mode 100644 drivers/iio/flow/slf3s.c diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig index 661127aed..652557a5b 100644 --- a/drivers/iio/Kconfig +++ b/drivers/iio/Kconfig @@ -92,6 +92,7 @@ source "drivers/iio/common/Kconfig" source "drivers/iio/dac/Kconfig" source "drivers/iio/dummy/Kconfig" source "drivers/iio/filter/Kconfig" +source "drivers/iio/flow/Kconfig" source "drivers/iio/frequency/Kconfig" source "drivers/iio/gyro/Kconfig" source "drivers/iio/health/Kconfig" diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile index cb80ef837..f03a4100c 100644 --- a/drivers/iio/Makefile +++ b/drivers/iio/Makefile @@ -29,6 +29,7 @@ obj-y += dac/ obj-y += dummy/ obj-y += gyro/ obj-y += filter/ +obj-y += flow/ obj-y += frequency/ obj-y += health/ obj-y += humidity/ diff --git a/drivers/iio/flow/Kconfig b/drivers/iio/flow/Kconfig new file mode 100644 index 000000000..1eee131ea --- /dev/null +++ b/drivers/iio/flow/Kconfig @@ -0,0 +1,27 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Liquid / gas flow sensor drivers +# +# When adding new entries keep the list in alphabetical order + +menu "Flow sensors" + +config SENSIRION_SLF3S + tristate "Sensirion SLF3S liquid flow sensor" + depends on I2C + select CRC8 + help + Say yes here to build support for the Sensirion SLF3S family + of digital liquid-flow sensors: + + - SLF3S-0600F + - SLF3S-1300F + - SLF3S-4000B + + The driver reports the volumetric flow rate and the embedded + temperature reading via the standard IIO interface. + + To compile this driver as a module, choose M here: the module + will be called slf3s. + +endmenu diff --git a/drivers/iio/flow/Makefile b/drivers/iio/flow/Makefile new file mode 100644 index 000000000..3cf4ab95c --- /dev/null +++ b/drivers/iio/flow/Makefile @@ -0,0 +1,7 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for industrial I/O flow sensor drivers +# + +# When adding new entries keep the list in alphabetical order +obj-$(CONFIG_SENSIRION_SLF3S) += slf3s.o diff --git a/drivers/iio/flow/slf3s.c b/drivers/iio/flow/slf3s.c new file mode 100644 index 000000000..497a56f59 --- /dev/null +++ b/drivers/iio/flow/slf3s.c @@ -0,0 +1,406 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Sensirion SLF3S liquid flow sensor driver. + * + * Supports the SLF3S-0600F, SLF3S-1300F and SLF3S-4000B liquid-flow + * sensors over I2C. Each measurement frame returns a 16-bit signed + * flow value, a 16-bit signed temperature value and a status word, + * each protected by a CRC-8 byte. + * + * The active calibration medium (water or isopropyl alcohol) is + * runtime-switchable via the in_volumeflow_medium sysfs attribute and + * defaults to water. + * + * Datasheet: https://sensirion.com/products/catalog/SLF3S-0600F/ + * + * Copyright (C) 2026 CMBlu Energy GmbH + * Author: Wadim Mueller + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define SLF3S_CRC8_POLY 0x31 +#define SLF3S_CRC8_INIT 0xff + +#define SLF3S_PRODUCT_ID_LEN 18 +#define SLF3S_PRODUCT_FAMILY_BYTE 1 +#define SLF3S_PRODUCT_SUBTYPE_BYTE 3 +#define SLF3S_PRODUCT_FAMILY_ID 0x03 + +/* Datasheet section 2.2: tPU = 25 ms max from power-on to first cmd. */ +#define SLF3S_POWER_UP_DELAY_US (25 * USEC_PER_MSEC) +/* Datasheet section 2.2: tw = 60 ms typical until first valid sample. */ +#define SLF3S_MEAS_START_DELAY_US (60 * USEC_PER_MSEC) + +static const u8 slf3s_cmd_prep_pid[] = { 0x36, 0x7c }; +static const u8 slf3s_cmd_read_pid[] = { 0xe1, 0x02 }; +static const u8 slf3s_cmd_start_water[] = { 0x36, 0x08 }; +static const u8 slf3s_cmd_start_ipa[] = { 0x36, 0x15 }; +static const u8 slf3s_cmd_stop_meas[] = { 0x3f, 0xf9 }; + +enum slf3s_medium { + SLF3S_MEDIUM_WATER, + SLF3S_MEDIUM_IPA, +}; + +static const char * const slf3s_medium_modes[] = { + [SLF3S_MEDIUM_WATER] = "water", + [SLF3S_MEDIUM_IPA] = "ipa", +}; + +/** + * struct slf3s_variant - per-variant calibration constants + * @sub_type: product-info sub-type byte returned by the sensor + * @name: name reported via @iio_dev.name + * @scale_num: flow scale numerator (l/s per LSB) + * @scale_den: flow scale denominator (l/s per LSB) + */ +struct slf3s_variant { + u8 sub_type; + const char *name; + int scale_num; + int scale_den; +}; + +static const struct slf3s_variant slf3s_variants[] = { + [0] = { + .sub_type = 0x03, + .name = "slf3s-0600f", + .scale_num = 1, + .scale_den = 600 * MICRO, + }, + [1] = { + .sub_type = 0x02, + .name = "slf3s-1300f", + .scale_num = 1, + .scale_den = 30 * MICRO, + }, + [2] = { + .sub_type = 0x05, + .name = "slf3s-4000b", + .scale_num = 1, + .scale_den = 1920 * MILLI, + }, +}; + +/** + * struct slf3s_data - per-device state + * @client: I2C client this instance is bound to + * @variant: pointer into @slf3s_variants for the detected device + * @medium: currently active calibration medium + * @crc_table: pre-computed CRC-8 lookup table for SLF3S_CRC8_POLY + */ +struct slf3s_data { + struct i2c_client *client; + const struct slf3s_variant *variant; + enum slf3s_medium medium; + u8 crc_table[CRC8_TABLE_SIZE]; +}; + +static bool slf3s_crc_valid(const struct slf3s_data *sf, const u8 *block) +{ + return crc8(sf->crc_table, block, 2, SLF3S_CRC8_INIT) == block[2]; +} + +static int slf3s_send_cmd(struct i2c_client *client, const u8 cmd[at_least 2]) +{ + int ret = i2c_master_send(client, cmd, 2); + + if (ret == 2) + return 0; + + return ret < 0 ? ret : -EIO; +} + +/* + * Read the product-info block and pick the matching variant. The + * sub-type byte returned by the sensor is the source of truth; a + * DT-supplied compatible only seeds an initial guess and is overridden + * on mismatch (with an informational message so misconfigured device + * trees are easy to spot). + * + * Bus / CRC failures are real errors and fail probe. An unknown + * sub-type byte fails probe too: we cannot publish a meaningful scale + * without a matching entry in slf3s_variants[]. + */ +static int slf3s_detect_variant(struct slf3s_data *sf) +{ + struct i2c_client *client = sf->client; + u8 buf[SLF3S_PRODUCT_ID_LEN]; + int ret; + + ret = slf3s_send_cmd(client, slf3s_cmd_prep_pid); + if (ret) + return ret; + + ret = slf3s_send_cmd(client, slf3s_cmd_read_pid); + if (ret) + return ret; + + ret = i2c_master_recv(client, buf, sizeof(buf)); + if (ret < 0) + return ret; + if (ret != sizeof(buf)) + return -EIO; + + for (unsigned int i = 0; i < SLF3S_PRODUCT_ID_LEN; i += 3) { + if (!slf3s_crc_valid(sf, &buf[i])) + return -EIO; + } + + if (buf[SLF3S_PRODUCT_FAMILY_BYTE] != SLF3S_PRODUCT_FAMILY_ID) + dev_info(&client->dev, + "unexpected family byte 0x%02x (expected 0x%02x)\n", + buf[SLF3S_PRODUCT_FAMILY_BYTE], + SLF3S_PRODUCT_FAMILY_ID); + + for (unsigned int i = 0; i < ARRAY_SIZE(slf3s_variants); i++) { + if (buf[SLF3S_PRODUCT_SUBTYPE_BYTE] != + slf3s_variants[i].sub_type) + continue; + + if (sf->variant && sf->variant != &slf3s_variants[i]) + dev_info(&client->dev, + "DT compatible says %s but sensor reports %s; using %s\n", + sf->variant->name, + slf3s_variants[i].name, + slf3s_variants[i].name); + + sf->variant = &slf3s_variants[i]; + + return 0; + } + + dev_err(&client->dev, "unknown SLF3S sub-type 0x%02x\n", + buf[SLF3S_PRODUCT_SUBTYPE_BYTE]); + + return -ENODEV; +} + +static int slf3s_read_sample(struct slf3s_data *sf, int *flow, int *temp) +{ + u8 buf[9]; + int ret; + + ret = i2c_master_recv(sf->client, buf, ARRAY_SIZE(buf)); + if (ret < 0) + return ret; + if (ret != ARRAY_SIZE(buf)) + return -EIO; + + for (unsigned int i = 0; i < ARRAY_SIZE(buf); i += 3) { + if (!slf3s_crc_valid(sf, &buf[i])) + return -EIO; + } + + *flow = sign_extend32(get_unaligned_be16(&buf[0]), 15); + *temp = sign_extend32(get_unaligned_be16(&buf[3]), 15); + + return 0; +} + +static int slf3s_get_medium(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan) +{ + struct slf3s_data *sf = iio_priv(indio_dev); + + return sf->medium; +} + +static int slf3s_set_medium(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, unsigned int mode) +{ + struct slf3s_data *sf = iio_priv(indio_dev); + const u8 *start_cmd; + int ret; + + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; + + ret = slf3s_send_cmd(sf->client, slf3s_cmd_stop_meas); + if (ret) + goto out; + + start_cmd = (mode == SLF3S_MEDIUM_IPA) ? slf3s_cmd_start_ipa + : slf3s_cmd_start_water; + + ret = slf3s_send_cmd(sf->client, start_cmd); + if (ret) + goto out; + + fsleep(SLF3S_MEAS_START_DELAY_US); + sf->medium = mode; +out: + iio_device_release_direct(indio_dev); + + return ret; +} + +static const struct iio_enum slf3s_medium_enum = { + .items = slf3s_medium_modes, + .num_items = ARRAY_SIZE(slf3s_medium_modes), + .get = slf3s_get_medium, + .set = slf3s_set_medium, +}; + +static const struct iio_chan_spec_ext_info slf3s_ext_info[] = { + IIO_ENUM("medium", IIO_SHARED_BY_TYPE, &slf3s_medium_enum), + IIO_ENUM_AVAILABLE("medium", IIO_SHARED_BY_TYPE, &slf3s_medium_enum), + { } +}; + +static const struct iio_chan_spec slf3s_channels[] = { + { + .type = IIO_VOLUMEFLOW, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + .ext_info = slf3s_ext_info, + }, + { + .type = IIO_TEMP, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + }, +}; + +static int slf3s_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, + int *val2, long mask) +{ + struct slf3s_data *sf = iio_priv(indio_dev); + int flow, temp, ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; + + ret = slf3s_read_sample(sf, &flow, &temp); + iio_device_release_direct(indio_dev); + if (ret) + return ret; + + *val = (chan->type == IIO_VOLUMEFLOW) ? flow : temp; + + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + if (chan->type == IIO_VOLUMEFLOW) { + *val = sf->variant->scale_num; + *val2 = sf->variant->scale_den; + + return IIO_VAL_FRACTIONAL; + } + /* Temperature LSB = 1/200 degC; IIO_TEMP wants milli-degC. */ + *val = 1000 / 200; + + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +static const struct iio_info slf3s_info = { + .read_raw = slf3s_read_raw, +}; + +static void slf3s_stop_meas(void *data) +{ + struct slf3s_data *sf = data; + + slf3s_send_cmd(sf->client, slf3s_cmd_stop_meas); +} + +static int slf3s_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct iio_dev *indio_dev; + struct slf3s_data *sf; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*sf)); + if (!indio_dev) + return -ENOMEM; + + sf = iio_priv(indio_dev); + sf->client = client; + sf->variant = i2c_get_match_data(client); + sf->medium = SLF3S_MEDIUM_WATER; + crc8_populate_msb(sf->crc_table, SLF3S_CRC8_POLY); + + ret = devm_regulator_get_enable(dev, "vdd"); + if (ret) + return dev_err_probe(dev, ret, "failed to enable vdd supply\n"); + + fsleep(SLF3S_POWER_UP_DELAY_US); + + ret = slf3s_detect_variant(sf); + if (ret) + return dev_err_probe(dev, ret, "product info read failed\n"); + + ret = slf3s_send_cmd(client, slf3s_cmd_start_water); + if (ret) + return dev_err_probe(dev, ret, + "failed to start measurement\n"); + + fsleep(SLF3S_MEAS_START_DELAY_US); + + ret = devm_add_action_or_reset(dev, slf3s_stop_meas, sf); + if (ret) + return ret; + + indio_dev->name = sf->variant->name; + indio_dev->channels = slf3s_channels; + indio_dev->num_channels = ARRAY_SIZE(slf3s_channels); + indio_dev->info = &slf3s_info; + indio_dev->modes = INDIO_DIRECT_MODE; + + return devm_iio_device_register(dev, indio_dev); +} + +static const struct i2c_device_id slf3s_id[] = { + { .name = "slf3s-0600f", + .driver_data = (kernel_ulong_t)&slf3s_variants[0] }, + { .name = "slf3s-1300f", + .driver_data = (kernel_ulong_t)&slf3s_variants[1] }, + { .name = "slf3s-4000b", + .driver_data = (kernel_ulong_t)&slf3s_variants[2] }, + { } +}; +MODULE_DEVICE_TABLE(i2c, slf3s_id); + +static const struct of_device_id slf3s_of_match[] = { + { .compatible = "sensirion,slf3s-0600f", .data = &slf3s_variants[0] }, + { .compatible = "sensirion,slf3s-1300f", .data = &slf3s_variants[1] }, + { .compatible = "sensirion,slf3s-4000b", .data = &slf3s_variants[2] }, + { } +}; +MODULE_DEVICE_TABLE(of, slf3s_of_match); + +static struct i2c_driver slf3s_driver = { + .driver = { + .name = "slf3s", + .of_match_table = slf3s_of_match, + }, + .probe = slf3s_probe, + .id_table = slf3s_id, +}; +module_i2c_driver(slf3s_driver); + +MODULE_AUTHOR("Wadim Mueller "); +MODULE_DESCRIPTION("Sensirion SLF3S liquid flow sensor driver"); +MODULE_LICENSE("GPL"); -- 2.52.0