@@ -252,6 +252,14 @@ config ISL29125
To compile this driver as a module, choose M here: the module will be
called isl29125.
+config ISL76682
+ tristate "Intersil ISL76682 Light Sensor"
+ depends on I2C
+ select REGMAP_I2C
+ help
+ Provides driver for the Intersil's ISL76682 device. This driver
+ supports the sysfs interface to get the ALS and IR intensity.
+
config HID_SENSOR_ALS
depends on HID_SENSOR_HUB
select IIO_BUFFER
@@ -28,6 +28,7 @@ obj-$(CONFIG_IQS621_ALS) += iqs621-als.o
obj-$(CONFIG_SENSORS_ISL29018) += isl29018.o
obj-$(CONFIG_SENSORS_ISL29028) += isl29028.o
obj-$(CONFIG_ISL29125) += isl29125.o
+obj-$(CONFIG_ISL76682) += isl76682.o
obj-$(CONFIG_JSA1212) += jsa1212.o
obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o
obj-$(CONFIG_LTR501) += ltr501.o
new file mode 100644
@@ -0,0 +1,336 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * IIO driver for the light sensor ISL76682.
+ * ISL76682 is Ambient Light Sensor
+ *
+ * Copyright (c) 2023 Marek Vasut <marex@denx.de>
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define ISL76682_REG_COMMAND 0x00
+
+#define ISL76682_COMMAND_EN BIT(7)
+#define ISL76682_COMMAND_MODE_CONTINUOUS BIT(6)
+#define ISL76682_COMMAND_LIGHT_IR BIT(5)
+
+#define ISL76682_COMMAND_RANGE_LUX_1K 0
+#define ISL76682_COMMAND_RANGE_LUX_4K (1 << 0)
+#define ISL76682_COMMAND_RANGE_LUX_16K (2 << 0)
+#define ISL76682_COMMAND_RANGE_LUX_64K (3 << 0)
+#define ISL76682_COMMAND_RANGE_LUX_MASK GENMASK(1, 0)
+
+#define ISL76682_REG_ALSIR_L 0x01
+
+#define ISL76682_REG_ALSIR_U 0x02
+
+#define ISL76682_NUM_REGS (ISL76682_REG_ALSIR_U + 1)
+
+#define ISL76682_CONV_TIME_MS 100
+
+#define ISL76682_ADC_MAX 0xffff
+
+struct isl76682_chip {
+ struct mutex lock;
+ struct regmap *regmap;
+ u8 range;
+ u8 command;
+};
+
+static int isl76682_get(struct isl76682_chip *chip, bool mode_ir, int *data)
+{
+ u8 command;
+ int ret;
+
+ command = ISL76682_COMMAND_EN | ISL76682_COMMAND_MODE_CONTINUOUS |
+ chip->range;
+
+ if (mode_ir)
+ command |= ISL76682_COMMAND_LIGHT_IR;
+
+ if (command != chip->command) {
+ ret = regmap_write(chip->regmap, ISL76682_REG_COMMAND, command);
+ if (ret)
+ return ret;
+
+ /* Need to wait for conversion time if ALS/IR mode enabled */
+ msleep(ISL76682_CONV_TIME_MS);
+
+ chip->command = command;
+ }
+
+ return regmap_bulk_read(chip->regmap, ISL76682_REG_ALSIR_L, data, 2);
+}
+
+static int isl76682_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct isl76682_chip *chip = iio_priv(indio_dev);
+ u8 range;
+
+ if (chan->type != IIO_LIGHT)
+ return -EINVAL;
+
+ if (mask != IIO_CHAN_INFO_SCALE)
+ return -EINVAL;
+
+ if (val != 0)
+ return -EINVAL;
+
+ if (chan->type == IIO_LIGHT) {
+ if (val2 == 15000) /* 0.015 ... 1000 lux */
+ range = ISL76682_COMMAND_RANGE_LUX_1K;
+ else if (val2 == 60000) /* 0.060 ... 4000 lux */
+ range = ISL76682_COMMAND_RANGE_LUX_4K;
+ else if (val2 == 240000) /* 0.240 ... 16000 lux */
+ range = ISL76682_COMMAND_RANGE_LUX_16K;
+ else if (val2 == 960000) /* 0.960 ... 64000 lux */
+ range = ISL76682_COMMAND_RANGE_LUX_64K;
+ else
+ return -EINVAL;
+ } else if (chan->type == IIO_INTENSITY) {
+ if (val2 == 10500) /* 0.0105 .. 1000 lux */
+ range = ISL76682_COMMAND_RANGE_LUX_1K;
+ else if (val2 == 42000) /* 0.042 ... 4000 lux */
+ range = ISL76682_COMMAND_RANGE_LUX_4K;
+ else if (val2 == 168000) /* 0.168 ... 16000 lux */
+ range = ISL76682_COMMAND_RANGE_LUX_16K;
+ else if (val2 == 673000) /* 0.673 ... 64000 lux */
+ range = ISL76682_COMMAND_RANGE_LUX_64K;
+ else
+ return -EINVAL;
+ } else {
+ return -EINVAL;
+ }
+
+ mutex_lock(&chip->lock);
+ chip->range = range;
+ mutex_unlock(&chip->lock);
+
+ return 0;
+}
+
+static int isl76682_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct isl76682_chip *chip = iio_priv(indio_dev);
+ int ret = -EINVAL;
+
+ mutex_lock(&chip->lock);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ switch (chan->type) {
+ case IIO_LIGHT:
+ ret = isl76682_get(chip, false, val);
+ break;
+ case IIO_INTENSITY:
+ ret = isl76682_get(chip, true, val);
+ break;
+ default:
+ break;
+ }
+
+ if (ret < 0)
+ break;
+
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ *val = 0;
+ switch (chan->type) {
+ case IIO_LIGHT:
+ if (chip->range == ISL76682_COMMAND_RANGE_LUX_1K)
+ *val2 = 15000;
+ else if (chip->range == ISL76682_COMMAND_RANGE_LUX_4K)
+ *val2 = 60000;
+ else if (chip->range == ISL76682_COMMAND_RANGE_LUX_16K)
+ *val2 = 240000;
+ else if (chip->range == ISL76682_COMMAND_RANGE_LUX_64K)
+ *val2 = 960000;
+ else
+ break;
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ case IIO_INTENSITY:
+ if (chip->range == ISL76682_COMMAND_RANGE_LUX_1K)
+ *val2 = 10500;
+ else if (chip->range == ISL76682_COMMAND_RANGE_LUX_4K)
+ *val2 = 42000;
+ else if (chip->range == ISL76682_COMMAND_RANGE_LUX_16K)
+ *val2 = 168000;
+ else if (chip->range == ISL76682_COMMAND_RANGE_LUX_64K)
+ *val2 = 673000;
+ else
+ break;
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ mutex_unlock(&chip->lock);
+
+ return ret;
+}
+
+static IIO_CONST_ATTR(in_illuminance_scale_available, "0.015 0.06 0.24 0.96");
+static IIO_CONST_ATTR(in_intensity_scale_available, "0.0105 0.042 0.168 0.673");
+static IIO_CONST_ATTR(integration_time_available, "0.090"); /* 90 ms */
+
+static struct attribute *isl76682_attributes[] = {
+ &iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
+ &iio_const_attr_in_intensity_scale_available.dev_attr.attr,
+ &iio_const_attr_integration_time_available.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group isl29108_group = {
+ .attrs = isl76682_attributes,
+};
+
+static const struct iio_chan_spec isl76682_channels[] = {
+ {
+ .type = IIO_LIGHT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ }, {
+ .type = IIO_INTENSITY,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ }
+};
+
+static const struct iio_info isl76682_info = {
+ .attrs = &isl29108_group,
+ .read_raw = isl76682_read_raw,
+ .write_raw = isl76682_write_raw,
+};
+
+static int isl76682_clear_configure_reg(struct isl76682_chip *chip)
+{
+ struct device *dev = regmap_get_device(chip->regmap);
+ int ret;
+
+ ret = regmap_write(chip->regmap, ISL76682_REG_COMMAND, 0x0);
+ if (ret < 0)
+ dev_err(dev, "Error %d clearing the CONFIGURE register\n", ret);
+
+ chip->command = 0;
+
+ return ret;
+}
+
+static bool isl76682_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case ISL76682_REG_ALSIR_L:
+ case ISL76682_REG_ALSIR_U:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_config isl76682_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .volatile_reg = isl76682_is_volatile_reg,
+ .max_register = ISL76682_NUM_REGS - 1,
+ .num_reg_defaults_raw = ISL76682_NUM_REGS,
+ .cache_type = REGCACHE_FLAT,
+};
+
+static int isl76682_probe(struct i2c_client *client)
+{
+ const struct i2c_device_id *id = i2c_client_get_device_id(client);
+ struct device *dev = &client->dev;
+ struct isl76682_chip *chip;
+ struct iio_dev *indio_dev;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ chip = iio_priv(indio_dev);
+
+ i2c_set_clientdata(client, indio_dev);
+ mutex_init(&chip->lock);
+
+ chip->regmap = devm_regmap_init_i2c(client, &isl76682_regmap_config);
+ if (IS_ERR(chip->regmap)) {
+ return dev_err_probe(dev, PTR_ERR(chip->regmap),
+ "Error initializing regmap\n");
+ }
+
+ chip->range = ISL76682_COMMAND_RANGE_LUX_1K;
+
+ ret = isl76682_clear_configure_reg(chip);
+ if (ret < 0)
+ return ret;
+
+ indio_dev->info = &isl76682_info;
+ indio_dev->channels = isl76682_channels;
+ indio_dev->num_channels = ARRAY_SIZE(isl76682_channels);
+ indio_dev->name = id->name;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = iio_device_register(indio_dev);
+ if (ret < 0)
+ return dev_err_probe(dev, ret, "Device registration failed\n");
+
+ return 0;
+}
+
+static void isl76682_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct isl76682_chip *chip = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+
+ isl76682_clear_configure_reg(chip);
+}
+
+static const struct i2c_device_id isl76682_id[] = {
+ {"isl76682", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, isl76682_id);
+
+static const struct of_device_id isl76682_of_match[] = {
+ { .compatible = "isil,isl76682", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, isl76682_of_match);
+
+static struct i2c_driver isl76682_driver = {
+ .driver = {
+ .name = "isl76682",
+ .of_match_table = isl76682_of_match,
+ },
+ .probe = isl76682_probe,
+ .remove = isl76682_remove,
+ .id_table = isl76682_id,
+};
+
+module_i2c_driver(isl76682_driver);
+
+MODULE_DESCRIPTION("ISL76682 Ambient Light Sensor driver");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
The ISL76682 is very basic ALS which only supports ALS or IR mode in four ranges, 1k/4k/16k/64k LUX. There is no IRQ support or any other fancy functionality. Signed-off-by: Marek Vasut <marex@denx.de> --- Cc: Alexander Stein <alexander.stein@ew.tq-group.com> Cc: Andre Werner <andre.werner@systec-electronic.com> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Conor Dooley <conor+dt@kernel.org> Cc: Fabio Estevam <festevam@denx.de> Cc: Guenter Roeck <linux@roeck-us.net> Cc: Jonathan Cameron <jic23@kernel.org> Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org> Cc: Lars-Peter Clausen <lars@metafoo.de> Cc: Luca Ceresoli <luca.ceresoli@bootlin.com> Cc: Mark Brown <broonie@kernel.org> Cc: Matti Vaittinen <mazziesaccount@gmail.com> Cc: Naresh Solanki <naresh.solanki@9elements.com> Cc: Patrick Rudolph <patrick.rudolph@9elements.com> Cc: Rob Herring <robh+dt@kernel.org> Cc: Stefan Windfeldt-Prytz <stefan.windfeldt-prytz@axis.com> Cc: Vincent Tremblay <vincent@vtremblay.dev> Cc: devicetree@vger.kernel.org Cc: linux-iio@vger.kernel.org --- V2: - Overhaul the driver - Cache the entire 8-bit command register instead of parts of it and build up and rewrite the entire register if necessary - Fix illumination scale, add intensity scale, add integration time --- drivers/iio/light/Kconfig | 8 + drivers/iio/light/Makefile | 1 + drivers/iio/light/isl76682.c | 336 +++++++++++++++++++++++++++++++++++ 3 files changed, 345 insertions(+) create mode 100644 drivers/iio/light/isl76682.c