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Perez de Azpillaga" Subject: [PATCH v3 2/2] iio: light: add AS7343 multi-spectral sensor driver Date: Wed, 9 Sep 2026 23:38:13 -0700 Message-ID: <20260910063813.56419-3-marcus.yu.56@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260910063813.56419-1-marcus.yu.56@gmail.com> References: <20260910063813.56419-1-marcus.yu.56@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 This patch adds a driver for the AMS AS7343 14-channel multi-spectral sensor with I2C interface. The driver exposes 12 spectral channels (11 visible + 1 near-infrared) via the IIO sysfs interface. Each channel's raw data is provided as a 16-bit little-endian unsigned integer. Basic power management (suspend/resume) is supported. Note that power management is designed in such a way that we only stop spectrual measurements when susepended and do not power off. More complex features such as auto-suspend, interrupts, and configurable gain/integration time will be added in future patches. Datasheet: https://look.ams-osram.com/m/5f2d27fff9a874d2/original/AS7343-14-Channel-Multi-Spectral-Sensor.pdf Signed-off-by: Chang Yu --- Changes in v3: - Hold a mutex before reading measurements. - Add pm_runtime_resume_and_get before reading measurements. - Only start measurements after suspend action has been successfully registered - Check the return value of regmap_read when verifying device ID. Changes in v2: - Adjust the default gain to x256 and integration time to 50.1ms as recommended by the datasheet. - Use read_label instead of .extend - Remove all unused scan_index related constants. - Add missing calls to pm_runtime_* methods in probe. - Fix various code style issues MAINTAINERS | 1 + drivers/iio/light/Kconfig | 11 + drivers/iio/light/Makefile | 1 + drivers/iio/light/as7343.c | 397 +++++++++++++++++++++++++++++++++++++ 4 files changed, 410 insertions(+) create mode 100644 drivers/iio/light/as7343.c diff --git a/MAINTAINERS b/MAINTAINERS index 8cf4e1635053..236102b3c28e 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1435,6 +1435,7 @@ M: Chang Yu L: linux-iio@vger.kernel.org S: Maintained F: Documentation/devicetree/bindings/iio/light/ams,as7343.yaml +F: drivers/iio/light/as7343.c AMT (Automatic Multicast Tunneling) M: Taehee Yoo diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig index ef36824f312f..edbeeba9d873 100644 --- a/drivers/iio/light/Kconfig +++ b/drivers/iio/light/Kconfig @@ -149,6 +149,17 @@ config AS73211 This driver can also be built as a module. If so, the module will be called as73211. +config AS7343 + tristate "AMS AS7343 14-Channel Multi-Spectral Sensor" + depends on I2C + select REGMAP_I2C + help + Say Y here to build support for the AMS AS7343 14-channel + multi-spectral sensor. + + To compile this driver as a module, choose M here: the module will + be called as7343. + config BH1745 tristate "ROHM BH1745 colour sensor" depends on I2C diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile index 64e354c49ed8..5d0d33802519 100644 --- a/drivers/iio/light/Makefile +++ b/drivers/iio/light/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_APDS9306) += apds9306.o obj-$(CONFIG_APDS9960) += apds9960.o obj-$(CONFIG_APDS9999) += apds9999.o obj-$(CONFIG_AS73211) += as73211.o +obj-$(CONFIG_AS7343) += as7343.o obj-$(CONFIG_BH1745) += bh1745.o obj-$(CONFIG_BH1750) += bh1750.o obj-$(CONFIG_BH1780) += bh1780.o diff --git a/drivers/iio/light/as7343.c b/drivers/iio/light/as7343.c new file mode 100644 index 000000000000..8982cd6ec5d8 --- /dev/null +++ b/drivers/iio/light/as7343.c @@ -0,0 +1,397 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Support for AMS AS7343 14-channel multi-spectral sensor. + * (7-bit I2C slave address 0x39) + * + * Based on the work of: + * Christian Eggers (AS73211 driver) + * + * Copyright (c) 2026 Chang Yu + * + * Datasheets: + * https://look.ams-osram.com/m/5f2d27fff9a874d2/original/AS7343-14-Channel-Multi-Spectral-Sensor.pdf + * + * TODO: + * - Autosuspend + * - Support for configurable gain and integration time + * - Interrupt support + * - Add support for reading the VIS channel + * - Flicker detection + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include + +/* AS7343 registers */ +#define AS7343_ID 0x5a + +#define AS7343_ENABLE 0x80 +#define AS7343_ENABLE_PON BIT(0) +#define AS7343_ENABLE_SP_EN BIT(1) + +/* + * Integration time is calculated as (ATIME + 1) * ((ASTEP + 1) * 2.78us). + * Setting a 30 * 1.67ms = 50.1ms integration test as the default for now. + */ +#define AS7343_ATIME 0x81 +#define AS7343_ATIME_VAL 29 /* (29 + 1) = 30 steps */ +#define AS7343_ASTEP 0xd4 +#define AS7343_ASTEP_VAL 599 /* 1.67ms step size */ + +#define AS7343_CFG0 0xbf +#define AS7343_CFG0_REG_BANK BIT(4) + +#define AS7343_CFG1 0xc6 +#define AS7343_CFG1_AGAIN GENMASK(4, 0) +#define AS7343_CFG1_AGAIN_X0_5 0 +#define AS7343_CFG1_AGAIN_X1 1 +#define AS7343_CFG1_AGAIN_X2 2 +#define AS7343_CFG1_AGAIN_X4 3 +#define AS7343_CFG1_AGAIN_X8 4 +#define AS7343_CFG1_AGAIN_X16 5 +#define AS7343_CFG1_AGAIN_X32 6 +#define AS7343_CFG1_AGAIN_X64 7 +#define AS7343_CFG1_AGAIN_X128 8 +#define AS7343_CFG1_AGAIN_X256 9 +#define AS7343_CFG1_AGAIN_X512 10 +#define AS7343_CFG1_AGAIN_X1024 11 +#define AS7343_CFG1_AGAIN_X2048 12 + +#define AS7343_CFG20 0xd6 +#define AS7343_CFG20_AUTO_SMUX GENMASK(6, 5) +#define AS7343_CFG20_AUTO_SMUX_READOUT_ALL 3 /* all-channel readout */ + +#define AS7343_ASTATUS 0x94 + +/* AS7343 data registers */ +#define AS7343_DATA_FZ 0x95 +#define AS7343_DATA_FY 0x97 +#define AS7343_DATA_FXL 0x99 +#define AS7343_DATA_NIR 0x9b +#define AS7343_DATA_F2 0xa1 +#define AS7343_DATA_F3 0xa3 +#define AS7343_DATA_F4 0xa5 +#define AS7343_DATA_F6 0xa7 +#define AS7343_DATA_F1 0xad +#define AS7343_DATA_F7 0xaf +#define AS7343_DATA_F8 0xb1 +#define AS7343_DATA_F5 0xb3 +#define AS7343_MAX 0xff + +/* AS7343 channel indices. MUST match data register order above. */ +#define AS7343_CHAN_IDX_FZ 0 +#define AS7343_CHAN_IDX_FY 1 +#define AS7343_CHAN_IDX_FXL 2 +#define AS7343_CHAN_IDX_NIR 3 +#define AS7343_CHAN_IDX_F2 4 +#define AS7343_CHAN_IDX_F3 5 +#define AS7343_CHAN_IDX_F4 6 +#define AS7343_CHAN_IDX_F6 7 +#define AS7343_CHAN_IDX_F1 8 +#define AS7343_CHAN_IDX_F7 9 +#define AS7343_CHAN_IDX_F8 10 +#define AS7343_CHAN_IDX_F5 11 + +#define AS7343_CHAN(_chan) \ + { \ + .type = IIO_INTENSITY, \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .address = AS7343_DATA_##_chan, \ + .indexed = 1, \ + .channel = AS7343_CHAN_IDX_##_chan, \ + } + +static const struct iio_chan_spec as7343_channels[] = { + AS7343_CHAN(FZ), AS7343_CHAN(FY), AS7343_CHAN(FXL), AS7343_CHAN(NIR), + AS7343_CHAN(F2), AS7343_CHAN(F3), AS7343_CHAN(F4), AS7343_CHAN(F6), + AS7343_CHAN(F1), AS7343_CHAN(F7), AS7343_CHAN(F8), AS7343_CHAN(F5), +}; + +struct as7343_data { + struct regmap *regmap; + struct mutex mutex; +}; + +static int as7343_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, + int *val2, long mask) +{ + struct as7343_data *data = iio_priv(indio_dev); + struct device *dev = regmap_get_device(data->regmap); + int ret; + unsigned int unused; + __le16 result; + + ret = pm_runtime_resume_and_get(dev); + if (ret) + return ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: { + /* Wait until integration time passes for all 3 cycles. */ + msleep(160); + + /* + * Reading ASTATUS latches all data registers to this read. + * We don't care about the returned saturation/gain status for + * now. + */ + guard(mutex)(&data->mutex); + ret = regmap_read(data->regmap, AS7343_ASTATUS, &unused); + if (ret) + break; + + ret = regmap_bulk_read(data->regmap, chan->address, &result, 2); + if (ret) + break; + + *val = le16_to_cpu(result); + ret = IIO_VAL_INT; + break; + } + + default: + ret = -EINVAL; + break; + } + + pm_runtime_put(dev); + return ret; +} + +static const char *as7343_channel_label(struct iio_chan_spec const *chan) +{ + switch (chan->channel) { + case AS7343_CHAN_IDX_FZ: + return "FZ"; + case AS7343_CHAN_IDX_FY: + return "FY"; + case AS7343_CHAN_IDX_FXL: + return "FXL"; + case AS7343_CHAN_IDX_NIR: + return "NIR"; + case AS7343_CHAN_IDX_F2: + return "F2"; + case AS7343_CHAN_IDX_F3: + return "F3"; + case AS7343_CHAN_IDX_F4: + return "F4"; + case AS7343_CHAN_IDX_F6: + return "F6"; + case AS7343_CHAN_IDX_F1: + return "F1"; + case AS7343_CHAN_IDX_F7: + return "F7"; + case AS7343_CHAN_IDX_F8: + return "F8"; + case AS7343_CHAN_IDX_F5: + return "F5"; + default: + return NULL; + } +} + +static int as7343_read_label(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, char *label) +{ + const char *name; + + name = as7343_channel_label(chan); + if (!name) + return -EINVAL; + + return sysfs_emit(label, "%s\n", name); +} + +static const struct iio_info as7343_info = { + .read_raw = as7343_read_raw, + .read_label = as7343_read_label, +}; + +static const struct regmap_config as7343_regmap_config = { + .name = "as7343", + .reg_bits = 8, + .val_bits = 8, + .max_register = AS7343_MAX, + .reg_format_endian = REGMAP_ENDIAN_LITTLE, + .val_format_endian = REGMAP_ENDIAN_LITTLE, + .cache_type = REGCACHE_NONE, +}; + +static int as7343_setup_device(struct device *dev, struct as7343_data *data) +{ + unsigned int val; + __le16 step; + int ret; + + /* Power on */ + ret = regmap_set_bits(data->regmap, AS7343_ENABLE, AS7343_ENABLE_PON); + if (ret) + return ret; + + /* Need to set REG_BANK to 1 before we can access ID */ + ret = regmap_set_bits(data->regmap, AS7343_CFG0, AS7343_CFG0_REG_BANK); + if (ret) + return ret; + + ret = regmap_read(data->regmap, AS7343_ID, &val); + if (ret) + return ret; + + if (val != 0x81) + dev_info(dev, "Unknown device ID: %x\n", val); + + ret = regmap_clear_bits(data->regmap, AS7343_CFG0, + AS7343_CFG0_REG_BANK); + if (ret) + return ret; + + /* Configure the SMUX to readout all channels */ + ret = regmap_update_bits( + data->regmap, AS7343_CFG20, AS7343_CFG20_AUTO_SMUX, + FIELD_PREP(AS7343_CFG20_AUTO_SMUX, + AS7343_CFG20_AUTO_SMUX_READOUT_ALL)); + if (ret) + return ret; + + /* Set 50.1ms integration time and x256 gain for now */ + step = cpu_to_le16(AS7343_ASTEP_VAL); + ret = regmap_bulk_write(data->regmap, AS7343_ASTEP, &step, 2); + if (ret) + return ret; + + ret = regmap_write(data->regmap, AS7343_ATIME, AS7343_ATIME_VAL); + if (ret) + return ret; + + return regmap_update_bits(data->regmap, AS7343_CFG1, AS7343_CFG1_AGAIN, + FIELD_PREP(AS7343_CFG1_AGAIN, + AS7343_CFG1_AGAIN_X256)); +} + +static int as7343_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct as7343_data *data = iio_priv(indio_dev); + + return regmap_clear_bits(data->regmap, AS7343_ENABLE, + AS7343_ENABLE_SP_EN); +} + +static int as7343_resume(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct as7343_data *data = iio_priv(indio_dev); + + return regmap_set_bits(data->regmap, AS7343_ENABLE, + AS7343_ENABLE_SP_EN); +} + +static void as7343_suspend_action(void *data) +{ + as7343_suspend(data); +} + +static int as7343_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct as7343_data *data; + struct iio_dev *indio_dev; + struct regmap *regmap; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + regmap = devm_regmap_init_i2c(client, &as7343_regmap_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + data = iio_priv(indio_dev); + i2c_set_clientdata(client, indio_dev); + data->regmap = regmap; + mutex_init(&data->mutex); + + indio_dev->name = "as7343"; + indio_dev->info = &as7343_info; + indio_dev->channels = as7343_channels; + indio_dev->num_channels = ARRAY_SIZE(as7343_channels); + indio_dev->modes = INDIO_DIRECT_MODE; + + ret = devm_regulator_get_enable(dev, "vdd"); + if (ret) + return ret; + + ret = as7343_setup_device(dev, data); + if (ret) + return ret; + + ret = devm_add_action_or_reset(dev, as7343_suspend_action, dev); + if (ret) + return dev_err_probe(dev, ret, + "Failed to add suspend action\n"); + + ret = pm_runtime_set_active(dev); + if (ret) + return dev_err_probe(dev, ret, + "Failed to activate PM runtime\n"); + + ret = devm_pm_runtime_enable(dev); + if (ret) + return dev_err_probe(dev, ret, "Failed to enable PM runtime\n"); + + /* Start measurements */ + ret = regmap_set_bits(data->regmap, AS7343_ENABLE, AS7343_ENABLE_SP_EN); + if (ret) + return ret; + + return devm_iio_device_register(dev, indio_dev); +} + +static DEFINE_RUNTIME_DEV_PM_OPS(as7343_pm_ops, as7343_suspend, as7343_resume, + NULL); + +static const struct of_device_id as7343_of_match[] = { + { .compatible = "ams,as7343" }, + { }, +}; +MODULE_DEVICE_TABLE(of, as7343_of_match); + +static const struct i2c_device_id as7343_id[] = { + { .name = "as7343" }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, as7343_id); + +static struct i2c_driver as7343_driver = { + .driver = { + .name = "as7343", + .of_match_table = as7343_of_match, + .pm = pm_ptr(&as7343_pm_ops), + }, + .probe = as7343_probe, + .id_table = as7343_id, +}; +module_i2c_driver(as7343_driver); + +MODULE_AUTHOR("Chang Yu "); +MODULE_DESCRIPTION("AS7343 14 Channel Multi-Spectral Sensor driver"); +MODULE_LICENSE("GPL"); -- 2.55.0