[PATCH 2/2] iio: light: new driver for Dyna-Image AL3010
From: Rocky Hsiao
Date: Fri Jun 03 2016 - 06:04:30 EST
This driver is based on drivers/iio/light/al3320a.c
Differences form the original file:
- Difference REG map
- Difference scale
Signed-off-by: Rocky Hsiao <rocky.hsiao@xxxxxxxxxxxxxx>
---
drivers/iio/light/Kconfig | 10 ++
drivers/iio/light/Makefile | 1 +
drivers/iio/light/al3010.c | 292 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 303 insertions(+)
create mode 100644 drivers/iio/light/al3010.c
diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index ca89b26..57a2a7e 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -40,6 +40,16 @@ config AL3320A
To compile this driver as a module, choose M here: the
module will be called al3320a.
+config AL3010
+ tristate "AL3010 ambient light sensor"
+ depends on I2C
+ help
+ Say Y here if you want to build a driver for the Dyna Image AL3010
+ ambient light sensor.
+
+ To compile this driver as a module, choose M here: the
+ module will be called al3010.
+
config APDS9300
tristate "APDS9300 ambient light sensor"
depends on I2C
diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
index 5df1118..3f615d7 100644
--- a/drivers/iio/light/Makefile
+++ b/drivers/iio/light/Makefile
@@ -5,6 +5,7 @@
# When adding new entries keep the list in alphabetical order
obj-$(CONFIG_ACPI_ALS) += acpi-als.o
obj-$(CONFIG_ADJD_S311) += adjd_s311.o
+obj-$(CONFIG_AL3010) += al3010.o
obj-$(CONFIG_AL3320A) += al3320a.o
obj-$(CONFIG_APDS9300) += apds9300.o
obj-$(CONFIG_APDS9960) += apds9960.o
diff --git a/drivers/iio/light/al3010.c b/drivers/iio/light/al3010.c
new file mode 100644
index 0000000..84da37c
--- /dev/null
+++ b/drivers/iio/light/al3010.c
@@ -0,0 +1,292 @@
+/*
+ * AL3010A - Dyna Image Ambient Light Sensor
+ *
+ * Copyright (c) 2014, Intel Corporation.
+ *
+ * This file is subject to the terms and conditions of version 2 of
+ * the GNU General Public License. See the file COPYING in the main
+ * directory of this archive for more details.
+ *
+ * IIO driver for AL3010 (7-bit I2C slave address 0x1C).
+ *
+ * TODO: interrupt support, thresholds
+ *
+ * This driver is base on the original driver for AL3320A that was distributed
+ * by Intel Corporation.
+ *
+ * last change: 2016/06/03
+ * editor: Rocky Hsiao <rocky.hsiao@xxxxxxxxxxxxxx>
+ *
+ * Datasheet:
+ * http://www.dyna-image.com/english/product/optical-sensor-detail.php?cpid=1&dpid=10#doc
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define AL3010_DRV_NAME "al3010"
+
+#define AL3010_REG_SYSTEM 0x00
+#define AL3010_REG_CONFIG 0x10
+#define AL3010_REG_DATA_LOW 0x0c
+
+#define AL3010_GAIN_MASK (BIT(6) | BIT(5) | BIT(4))
+#define AL3010_GAIN_SHIFT 4
+
+#define AL3010_CONFIG_DISABLE 0x00
+#define AL3010_CONFIG_ENABLE 0x01
+
+#define AL3010_SCALE_AVAILABLE "1.1872 0.2968 0.0742 0.0186"
+
+enum al3010_range {
+ AL3010_RANGE_1, /* 77806 lx */
+ AL3010_RANGE_2, /* 19452 lx */
+ AL3010_RANGE_3, /* 4863 lx */
+ AL3010_RANGE_4 /* 1216 lx */
+};
+
+static const int al3010_scales[][2] = {
+ {0, 1187200}, {0, 296800}, {0, 74200}, {0, 18600}
+};
+
+struct al3010_data {
+ struct i2c_client *client;
+};
+
+static const struct iio_chan_spec al3010_channels[] = {
+ {
+ .type = IIO_LIGHT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ }
+};
+
+static int al3010_set_gain(struct al3010_data *data, int gain)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(data->client, AL3010_REG_CONFIG,
+ (gain<<AL3010_GAIN_SHIFT)&AL3010_GAIN_MASK);
+
+ return ret;
+}
+
+static int al3010_set_mode(struct al3010_data *data, int mode)
+{
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(data->client, AL3010_REG_SYSTEM, mode);
+
+ return ret;
+}
+
+static int al3010_get_mode(struct al3010_data *data)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(data->client, AL3010_REG_SYSTEM);
+
+ return ret;
+}
+
+static int al3010_get_adc_value(struct al3010_data *data)
+{
+ int ret;
+
+ ret = i2c_smbus_read_word_data(data->client, AL3010_REG_DATA_LOW);
+
+ return ret;
+}
+
+static int al3010_get_lux(struct al3010_data *data)
+{
+ int ret;
+ long int ret64;
+
+ ret = al3010_get_adc_value(data);
+ ret64 = ret;
+ ret64 = (ret64 * 74200) / 1000000;
+ ret = ret64;
+
+ return ret;
+}
+
+/* lux */
+static ssize_t al3010_show_lux(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct al3010_data *data = iio_priv(dev_to_iio_dev(dev));
+ int ret;
+
+ /* No LUX data if not operational */
+ if (al3010_get_mode(data) != AL3010_CONFIG_ENABLE)
+ return -EBUSY;
+
+ ret = al3010_get_lux(data);
+
+ return sprintf(buf, "%d\n", ret);
+}
+
+static IIO_CONST_ATTR(in_illuminance_scale_available, AL3010_SCALE_AVAILABLE);
+
+static DEVICE_ATTR(illuminance0_input, S_IRUGO, al3010_show_lux, NULL);
+
+static struct attribute *al3010_attributes[] = {
+ &dev_attr_illuminance0_input.attr,
+ &iio_const_attr_in_illuminance_scale_available.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group al3010_attribute_group = {
+ .attrs = al3010_attributes,
+};
+
+static int al3010_init(struct al3010_data *data)
+{
+ int err = 0;
+
+ err = al3010_set_mode(data, AL3010_CONFIG_ENABLE);
+ if (err) {
+ dev_err(&data->client->dev,
+ "%s: al3010_set_mode returned error %d\n",
+ __func__, err);
+ return err;
+ }
+
+ /*
+ * set sensor range to 4863 lux.
+ * (If panel luminousness is 10% , the range of pad is 0 ~ 48630 lux.)
+ */
+ err = al3010_set_gain(data, AL3010_RANGE_3);
+ if (err) {
+ dev_err(&data->client->dev,
+ "%s: al3010_set_range returned error %d\n",
+ __func__, err);
+ return err;
+ }
+
+ return 0;
+}
+
+static int al3010_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val,
+ int *val2, long mask)
+{
+ struct al3010_data *data = iio_priv(indio_dev);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ /*
+ * ALS ADC value is stored in two adjacent registers:
+ * - low byte of output is stored at AL3320A_REG_DATA_LOW
+ * - high byte of output is stored at AL3320A_REG_DATA_LOW + 1
+ */
+ ret = i2c_smbus_read_word_data(data->client,
+ AL3010_REG_DATA_LOW);
+ if (ret < 0)
+ return ret;
+ *val = ret;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ ret = i2c_smbus_read_byte_data(data->client,
+ AL3010_REG_CONFIG);
+ if (ret < 0)
+ return ret;
+
+ ret = (ret & AL3010_GAIN_MASK) >> AL3010_GAIN_SHIFT;
+ *val = al3010_scales[ret][0];
+ *val2 = al3010_scales[ret][1];
+
+ return IIO_VAL_INT_PLUS_MICRO;
+ }
+ return -EINVAL;
+}
+
+static int al3010_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int val,
+ int val2, long mask)
+{
+ struct al3010_data *data = iio_priv(indio_dev);
+ int i;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SCALE:
+ for (i = 0; i < ARRAY_SIZE(al3010_scales); i++) {
+ if (val == al3010_scales[i][0] &&
+ val2 == al3010_scales[i][1])
+ return al3010_set_gain(data, i);
+ }
+ break;
+ }
+ return -EINVAL;
+}
+
+static const struct iio_info al3010_info = {
+ .driver_module = THIS_MODULE,
+ .read_raw = al3010_read_raw,
+ .write_raw = al3010_write_raw,
+ .attrs = &al3010_attribute_group,
+};
+
+static int al3010_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct al3010_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;
+
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->info = &al3010_info;
+ indio_dev->name = AL3010_DRV_NAME;
+ indio_dev->channels = al3010_channels;
+ indio_dev->num_channels = ARRAY_SIZE(al3010_channels);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = al3010_init(data);
+ if (ret < 0) {
+ dev_err(&client->dev, "al3010 chip init failed\n");
+ return ret;
+ }
+
+ return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static int al3010_remove(struct i2c_client *client)
+{
+ return i2c_smbus_write_byte_data(client, AL3010_REG_SYSTEM, 0x00);
+}
+
+static const struct i2c_device_id al3010_id[] = {
+ {"al3010", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, al3010_id);
+
+static struct i2c_driver al3010_driver = {
+ .driver = {
+ .name = AL3010_DRV_NAME,
+ },
+ .probe = al3010_probe,
+ .remove = al3010_remove,
+ .id_table = al3010_id,
+};
+
+module_i2c_driver(al3010_driver);
+
+MODULE_AUTHOR("Rocky Hsiao <rocky.hsiao@xxxxxxxxxxxxxx");
+MODULE_DESCRIPTION("AL3010 Ambient Light Sensor driver");
+MODULE_LICENSE("GPL v2");
+
--
2.1.2