--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+#include <linux/array_size.h>
+#include <linux/bitfield.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/types.h>
+
+#include <linux/iio/iio.h>
+
+#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)
+
+/*
+ * These 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_PROCESSED),
+ },
+};
+
+static int al3000a_set_pwr_on(struct al3000a_data *data)
+{
+ struct device *dev = regmap_get_device(data->regmap);
+ int ret;
+
+ ret = regulator_enable(data->vdd_supply);
+ if (ret) {
+ dev_err(dev, "failed to enable vdd power supply\n");
+ return ret;
+ }
+
+ return regmap_write(data->regmap, AL3000A_REG_SYSTEM, AL3000A_CONFIG_ENABLE);
+}
+
+static void al3000a_set_pwr_off(void *_data)
+{
+ struct al3000a_data *data = _data;
+ struct device *dev = regmap_get_device(data->regmap);
+ int ret;
+
+ ret = regmap_write(data->regmap, AL3000A_REG_SYSTEM, AL3000A_CONFIG_DISABLE);
+ if (ret)
+ dev_err(dev, "failed to write system register\n");
+
+ ret = regulator_disable(data->vdd_supply);
+ if (ret)
+ dev_err(dev, "failed to disable vdd power supply\n");
+}
+
+static int al3000a_init(struct al3000a_data *data)
+{
+ int ret;
+
+ ret = al3000a_set_pwr_on(data);
+ if (ret)
+ return ret;
+
+ ret = regmap_write(data->regmap, AL3000A_REG_SYSTEM, AL3000A_CONFIG_RESET);
+ if (ret)
+ return ret;
+
+ return regmap_write(data->regmap, AL3000A_REG_SYSTEM, AL3000A_CONFIG_ENABLE);
+}
+
+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_PROCESSED:
+ ret = regmap_read(data->regmap, AL3000A_REG_DATA, &gain);
+ if (ret)
+ return ret;
+
+ *val = lux_table[gain & AL3000A_GAIN_MASK];
+
+ 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";
+ 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)
+ 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)
+ 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));
+
+ al3000a_set_pwr_off(data);
+ return 0;
+}
+
+static int al3000a_resume(struct device *dev)
+{
+ struct al3000a_data *data = iio_priv(dev_get_drvdata(dev));
+
+ return al3000a_set_pwr_on(data);
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(al3000a_pm_ops, al3000a_suspend, al3000a_resume);
+
+static const struct i2c_device_id al3000a_id[] = {
+ { "al3000a" },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, al3000a_id);
+
+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",
+ .of_match_table = al3000a_of_match,
+ .pm = pm_sleep_ptr(&al3000a_pm_ops),
+ },
+ .probe = al3000a_probe,
+ .id_table = al3000a_id,
+};
+module_i2c_driver(al3000a_driver);
+
+MODULE_AUTHOR("Svyatolsav Ryhel <clamor95@gmail.com>");
+MODULE_DESCRIPTION("al3000a Ambient Light Sensor driver");
+MODULE_LICENSE("GPL");
projects / thirdparty / kernel / linux.git / commitdiff
