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([188.163.112.51]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-309298dc5eesm2201571fa.95.2025.02.15.02.32.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 15 Feb 2025 02:32:27 -0800 (PST) From: Svyatoslav Ryhel To: Jonathan Cameron , Lars-Peter Clausen , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Thierry Reding , Jonathan Hunter , Svyatoslav Ryhel , Javier Carrasco , Matti Vaittinen , Andy Shevchenko , Emil Gedenryd , Arthur Becker , Mudit Sharma , Per-Daniel Olsson , Subhajit Ghosh , Ivan Orlov , David Heidelberg Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org Subject: [PATCH v2 2/3] iio: light: Add support for AL3000a illuminance sensor Date: Sat, 15 Feb 2025 12:31:58 +0200 Message-ID: <20250215103159.106343-3-clamor95@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250215103159.106343-1-clamor95@gmail.com> References: <20250215103159.106343-1-clamor95@gmail.com> Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 AL3000a is a simple I2C-based ambient light sensor, which is closely related to AL3010 and AL3320a, but has significantly different way of processing data generated by the sensor. Tested-by: Robert Eckelmann Signed-off-by: Svyatoslav Ryhel Reviewed-by: David Heidelberg --- drivers/iio/light/Kconfig | 10 ++ drivers/iio/light/Makefile | 1 + drivers/iio/light/al3000a.c | 221 ++++++++++++++++++++++++++++++++++++ 3 files changed, 232 insertions(+) create mode 100644 drivers/iio/light/al3000a.c diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig index e34e551eef3e..142f7f7ef0ec 100644 --- a/drivers/iio/light/Kconfig +++ b/drivers/iio/light/Kconfig @@ -43,6 +43,16 @@ config ADUX1020 To compile this driver as a module, choose M here: the module will be called adux1020. +config AL3000A + tristate "AL3000a ambient light sensor" + depends on I2C + help + Say Y here if you want to build a driver for the Dyna Image AL3000a + ambient light sensor. + + To compile this driver as a module, choose M here: the + module will be called al3000a. + config AL3010 tristate "AL3010 ambient light sensor" depends on I2C diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile index 11a4041b918a..17030a4cc340 100644 --- a/drivers/iio/light/Makefile +++ b/drivers/iio/light/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_ACPI_ALS) += acpi-als.o obj-$(CONFIG_ADJD_S311) += adjd_s311.o obj-$(CONFIG_ADUX1020) += adux1020.o +obj-$(CONFIG_AL3000A) += al3000a.o obj-$(CONFIG_AL3010) += al3010.o obj-$(CONFIG_AL3320A) += al3320a.o obj-$(CONFIG_APDS9300) += apds9300.o diff --git a/drivers/iio/light/al3000a.c b/drivers/iio/light/al3000a.c new file mode 100644 index 000000000000..58d4336dd081 --- /dev/null +++ b/drivers/iio/light/al3000a.c @@ -0,0 +1,221 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#define AL3000A_DRV_NAME "al3000a" +#define AL3000A_REG_SYSTEM 0x00 +#define AL3000A_REG_DATA 0x05 + +#define AL3000A_CONFIG_ENABLE 0x00 +#define AL3000A_CONFIG_DISABLE 0x0b +#define AL3000A_CONFIG_RESET 0x0f +#define AL3000A_GAIN_MASK GENMASK(5, 0) + +/* + * This are pre-calculated lux values based on possible output of sensor + * (range 0x00 - 0x3F) + */ +static const u32 lux_table[] = { + 1, 1, 1, 2, 2, 2, 3, 4, /* 0 - 7 */ + 4, 5, 6, 7, 9, 11, 13, 16, /* 8 - 15 */ + 19, 22, 27, 32, 39, 46, 56, 67, /* 16 - 23 */ + 80, 96, 116, 139, 167, 200, 240, 289, /* 24 - 31 */ + 347, 416, 499, 600, 720, 864, 1037, 1245, /* 32 - 39 */ + 1495, 1795, 2155, 2587, 3105, 3728, 4475, 5373, /* 40 - 47 */ + 6450, 7743, 9296, 11160, 13397, 16084, 19309, 23180, /* 48 - 55 */ + 27828, 33408, 40107, 48148, 57803, 69393, 83306, 100000 /* 56 - 63 */ +}; + +static const struct regmap_config al3000a_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = AL3000A_REG_DATA, +}; + +struct al3000a_data { + struct regmap *regmap; + struct regulator *vdd_supply; +}; + +static const struct iio_chan_spec al3000a_channels[] = { + { + .type = IIO_LIGHT, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + }, +}; + +static int al3000a_set_pwr(struct al3000a_data *data, bool pwr) +{ + struct device *dev = regmap_get_device(data->regmap); + u8 val = pwr ? AL3000A_CONFIG_ENABLE : AL3000A_CONFIG_DISABLE; + int ret; + + if (pwr) { + ret = regulator_enable(data->vdd_supply); + if (ret < 0) { + dev_err(dev, "failed to enable vdd power supply\n"); + return ret; + } + } + + ret = regmap_write(data->regmap, AL3000A_REG_SYSTEM, val); + if (ret < 0) { + dev_err(dev, "failed to write system register\n"); + return ret; + } + + if (!pwr) { + ret = regulator_disable(data->vdd_supply); + if (ret < 0) { + dev_err(dev, "failed to disable vdd power supply\n"); + return ret; + } + } + + return 0; +} + +static void al3000a_set_pwr_off(void *_data) +{ + struct al3000a_data *data = _data; + + al3000a_set_pwr(data, false); +} + +static int al3000a_init(struct al3000a_data *data) +{ + int ret; + + ret = al3000a_set_pwr(data, true); + if (ret < 0) + return ret; + + ret = regmap_write(data->regmap, AL3000A_REG_SYSTEM, AL3000A_CONFIG_RESET); + if (ret < 0) + return ret; + + ret = regmap_write(data->regmap, AL3000A_REG_SYSTEM, AL3000A_CONFIG_ENABLE); + if (ret < 0) + return ret; + + return 0; +} + +static int al3000a_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, int *val, + int *val2, long mask) +{ + struct al3000a_data *data = iio_priv(indio_dev); + int ret, gain; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = regmap_read(data->regmap, AL3000A_REG_DATA, &gain); + if (ret < 0) + return ret; + + *val = lux_table[gain & AL3000A_GAIN_MASK]; + + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + *val = 1; + + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +static const struct iio_info al3000a_info = { + .read_raw = al3000a_read_raw, +}; + +static int al3000a_probe(struct i2c_client *client) +{ + struct al3000a_data *data; + struct device *dev = &client->dev; + struct iio_dev *indio_dev; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + data = iio_priv(indio_dev); + i2c_set_clientdata(client, indio_dev); + + data->regmap = devm_regmap_init_i2c(client, &al3000a_regmap_config); + if (IS_ERR(data->regmap)) + return dev_err_probe(dev, PTR_ERR(data->regmap), + "cannot allocate regmap\n"); + + data->vdd_supply = devm_regulator_get(dev, "vdd"); + if (IS_ERR(data->vdd_supply)) + return dev_err_probe(dev, PTR_ERR(data->vdd_supply), + "failed to get vdd regulator\n"); + + indio_dev->info = &al3000a_info; + indio_dev->name = AL3000A_DRV_NAME; + indio_dev->channels = al3000a_channels; + indio_dev->num_channels = ARRAY_SIZE(al3000a_channels); + indio_dev->modes = INDIO_DIRECT_MODE; + + ret = al3000a_init(data); + if (ret < 0) + return dev_err_probe(dev, ret, "failed to init ALS\n"); + + ret = devm_add_action_or_reset(dev, al3000a_set_pwr_off, data); + if (ret < 0) + return dev_err_probe(dev, ret, "failed to add action\n"); + + return devm_iio_device_register(dev, indio_dev); +} + +static int al3000a_suspend(struct device *dev) +{ + struct al3000a_data *data = iio_priv(dev_get_drvdata(dev)); + + return al3000a_set_pwr(data, false); +} + +static int al3000a_resume(struct device *dev) +{ + struct al3000a_data *data = iio_priv(dev_get_drvdata(dev)); + + return al3000a_set_pwr(data, true); +} + +static DEFINE_SIMPLE_DEV_PM_OPS(al3000a_pm_ops, al3000a_suspend, al3000a_resume); + +static const struct of_device_id al3000a_of_match[] = { + { .compatible = "dynaimage,al3000a" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, al3000a_of_match); + +static struct i2c_driver al3000a_driver = { + .driver = { + .name = AL3000A_DRV_NAME, + .of_match_table = al3000a_of_match, + .pm = pm_sleep_ptr(&al3000a_pm_ops), + }, + .probe = al3000a_probe, +}; +module_i2c_driver(al3000a_driver); + +MODULE_AUTHOR("Svyatolsav Ryhel "); +MODULE_DESCRIPTION("al3000a Ambient Light Sensor driver"); +MODULE_LICENSE("GPL");