AL3000a is a simple I2C-based ambient light sensor, which is
closely related to AL3010 and AL3320a, but has significantly
different hardware configuration.
Signed-off-by: Svyatoslav Ryhel <clamor95@xxxxxxxxx>
---
drivers/iio/light/Kconfig | 10 ++
drivers/iio/light/Makefile | 1 +
drivers/iio/light/al3000a.c | 214 ++++++++++++++++++++++++++++++++++++
3 files changed, 225 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..9e1f2ac6a933
--- /dev/null
+++ b/drivers/iio/light/al3000a.c
@@ -0,0 +1,214 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AL3000a - Dyna Image Ambient Light Sensor
+ */
+
+#include <linux/bitfield.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#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
+
+/*
+ * This are pre-calculated lux values based on possible output
+ * of sensor (range 0x00 - 0x3F)
+ */
+static const u32 lux_table[64] = {
+ 1, 1, 1, 2, 2, 2, 3, 4, 4, 5, 6, 7, 9, 11, 13, 16,
+ 19, 22, 27, 32, 39, 46, 56, 67, 80, 96, 116, 139,
+ 167, 200, 240, 289, 347, 416, 499, 600, 720, 864,
+ 1037, 1245, 1495, 1795, 2155, 2587, 3105, 3728, 4475,
+ 5373, 6450, 7743, 9296, 11160, 13397, 16084, 19309,
+ 23180, 27828, 33408, 40107, 48148, 57803, 69393,
+ 83306, 100000
+};
+
+struct al3000a_data {
+ struct i2c_client *client;
+ 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 = &data->client->dev;
+ 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 = i2c_smbus_write_byte_data(data->client, 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 = i2c_smbus_write_byte_data(data->client, AL3000A_REG_SYSTEM,
+ AL3000A_CONFIG_RESET);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_write_byte_data(data->client, 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;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = i2c_smbus_read_byte_data(data->client,
+ AL3000A_REG_DATA);
+ if (ret < 0)
+ return ret;
+
+ *val = lux_table[ret & 0x3F];
+
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ *val = 1;
+
+ return IIO_VAL_INT;
+ default:
+ break;
+ }
+
+ 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 iio_dev *indio_dev;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ data = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ data->client = client;
+
+ data->vdd_supply = devm_regulator_get(&client->dev, "vdd");
+ if (IS_ERR(data->vdd_supply))
+ return dev_err_probe(&client->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(&client->dev, ret,
+ "failed to init ALS\n");
+
+ ret = devm_add_action_or_reset(&client->dev, al3000a_set_pwr_off,
+ data);
+ if (ret < 0)
+ return dev_err_probe(&client->dev, ret,
+ "failed to add action\n");
+
+ return devm_iio_device_register(&client->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 <clamor95@xxxxxxxxx>");
+MODULE_DESCRIPTION("al3000a Ambient Light Sensor driver");
+MODULE_LICENSE("GPL");
--
2.43.0
