Add driver for the TAOS 4531x family of I2C ambient light sensors; the chip
outputs a 16-bit lux value.
RFCs:
(1) naming: tsl45315 or tsl4531x or tsl4531? I just happend to have/test the 45315
(2) tsl45315_id is not really used, the variants just have different i2c addresses
and i2c voltages; drop?
(3) integration_time: driver uses tsl45315_ext_info to set/get the interation time
in_illuminance_integration_time (0 .. 400ms, 1 .. 200ms, 2 .. 100ms) which affects
in_illuminance_scale (1x, 2x, 4x) in order to produce lux when multiplied with
in_illuminance_raw; ok? better way to represent?
---
drivers/iio/light/Kconfig | 10 ++
drivers/iio/light/Makefile | 1 +
drivers/iio/light/tsl45315.c | 263 +++++++++++++++++++++++++++++++++++++++++++
3 files changed, 274 insertions(+)
create mode 100644 drivers/iio/light/tsl45315.c
diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index 5ef1a39..c1dfd57 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -42,6 +42,16 @@ config SENSORS_TSL2563
This driver can also be built as a module. If so, the module
will be called tsl2563.
+config TSL45315
+ tristate "TAOS TSL45311, TSL45313, TSL45315, TSL45317 ambient light sensors"
+ depends on I2C
+ help
+ Say Y here if you want to build a driver for the TAOS TSL4531x family
+ of ambient light sensors with direct lux output.
+
+ To compile this driver as a module, choose M here: the
+ module will be called tsl45315.
+
config VCNL4000
tristate "VCNL4000 combined ALS and proximity sensor"
depends on I2C
diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
index 040d9c7..333c292 100644
--- a/drivers/iio/light/Makefile
+++ b/drivers/iio/light/Makefile
@@ -5,5 +5,6 @@
obj-$(CONFIG_ADJD_S311) += adjd_s311.o
obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o
obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o
+obj-$(CONFIG_TSL45315) += tsl45315.o
obj-$(CONFIG_VCNL4000) += vcnl4000.o
obj-$(CONFIG_HID_SENSOR_ALS) += hid-sensor-als.o
diff --git a/drivers/iio/light/tsl45315.c b/drivers/iio/light/tsl45315.c
new file mode 100644
index 0000000..41c173d
--- /dev/null
+++ b/drivers/iio/light/tsl45315.c
@@ -0,0 +1,263 @@
+/*
+ * tsl45315.c - Support for TAOS TSL45315 ambient light sensor
+ *
+ * Copyright 2013 Peter Meerwald <pmeerw@xxxxxxxxxx>
+ *
+ * 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 the TSL4531x family
+ * TSL45311/TSL45313: 7-bit I2C slave address 0x39
+ * TSL45315/TSL45317: 7-bit I2C slave address 0x29
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define TSL45315_DRV_NAME "tsl45315"
+
+#define TSL45315_CONTROL 0x80
+#define TSL45315_CONFIG 0x81
+#define TSL45315_DATALOW 0x84
+#define TSL45315_DATAHIGH 0x85
+#define TSL45315_ID 0x8a
+
+#define TSL45315_MODE_POWERDOWN 0x00
+#define TSL45315_MODE_SINGLE_ADC 0x02
+#define TSL45315_MODE_NORMAL 0x03
+
+struct tsl45315_data {
+ struct i2c_client *client;
+ int int_time; /* 0 .. 400ms, 1 .. 200ms, 2 .. 100ms */
+};
+
+static const struct i2c_device_id tsl45315_id[] = {
+ { "tsl45311", 0 },
+ { "tsl45313", 1 },
+ { "tsl45315", 2 },
+ { "tsl45317", 3 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, tsl45315_id);
+
+static int tsl45315_measure(struct tsl45315_data *data, int *val)
+{
+ u16 buf;
+ int ret;
+
+ ret = i2c_smbus_read_i2c_block_data(data->client,
+ TSL45315_DATALOW, sizeof(buf), (u8 *) &buf);
+ if (ret < 0)
+ return ret;
+
+ *val = le16_to_cpu(buf);
+
+ return 0;
+}
+
+static ssize_t tsl45315_read_int_time(struct iio_dev *indio_dev,
+ uintptr_t private, const struct iio_chan_spec *chan, char *buf)
+{
+ struct tsl45315_data *data = iio_priv(indio_dev);
+ s32 ret;
+
+ ret = i2c_smbus_read_byte_data(data->client, TSL45315_CONFIG);
+ if (ret < 0)
+ return ret;
+
+ return sprintf(buf, "%d\n", ret & 0x03);
+}
+
+static ssize_t tsl45315_write_int_time(struct iio_dev *indio_dev,
+ uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
+ size_t len)
+{
+ struct tsl45315_data *data = iio_priv(indio_dev);
+ unsigned long int_time;
+ int ret;
+
+ ret = kstrtoul(buf, 10, &int_time);
+ if (ret)
+ return ret;
+
+ if (int_time > 2)
+ return -EINVAL;
+
+ ret = i2c_smbus_write_byte_data(data->client,
+ TSL45315_CONFIG, int_time);
+ if (ret < 0)
+ return ret;
+
+ data->int_time = int_time;
+
+ return len;
+}
+
+static const struct iio_chan_spec_ext_info tsl45315_ext_info[] = {
+ {
+ .name = "integration_time",
+ .read = tsl45315_read_int_time,
+ .write = tsl45315_write_int_time,
+ },
+ { }
+};
+
+static const struct iio_chan_spec tsl45315_channels[] = {
+ {
+ .type = IIO_LIGHT,
+ .ext_info = tsl45315_ext_info,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE)
+ }
+};
+
+static int tsl45315_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ int ret = -EINVAL;
+ struct tsl45315_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ switch (chan->type) {
+ case IIO_LIGHT:
+ ret = tsl45315_measure(data, val);
+ if (ret < 0)
+ return ret;
+ ret = IIO_VAL_INT;
+ break;
+ default:
+ break;
+ }
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ if (chan->type == IIO_LIGHT) {
+ /* 0.. 1x, 1 .. 2x, 2 .. 4x */
+ *val = 1 << data->int_time;
+ ret = IIO_VAL_INT;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static const struct iio_info tsl45315_info = {
+ .read_raw = tsl45315_read_raw,
+ .driver_module = THIS_MODULE,
+};
+
+static int tsl45315_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct tsl45315_data *data;
+ struct iio_dev *indio_dev;
+ int ret;
+
+ indio_dev = iio_device_alloc(sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ data = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ data->client = client;
+
+ ret = i2c_smbus_read_byte_data(data->client, TSL45315_ID);
+ if (ret < 0)
+ goto error_free_dev;
+
+ dev_info(&client->dev, "TSL4531x Ambient light sensor, Id %02x\n",
+ ret >> 4);
+
+ ret = i2c_smbus_write_byte_data(data->client, TSL45315_CONTROL,
+ TSL45315_MODE_NORMAL);
+ if (ret < 0)
+ goto error_free_dev;
+
+ ret = i2c_smbus_write_byte_data(data->client, TSL45315_CONFIG, 0);
+ if (ret < 0)
+ goto error_free_dev;
+
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->info = &tsl45315_info;
+ indio_dev->channels = tsl45315_channels;
+ indio_dev->num_channels = ARRAY_SIZE(tsl45315_channels);
+ indio_dev->name = TSL45315_DRV_NAME;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ ret = iio_device_register(indio_dev);
+ if (ret < 0)
+ goto error_free_dev;
+
+ return 0;
+
+error_free_dev:
+ iio_device_free(indio_dev);
+ return ret;
+}
+
+static int tsl45315_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+
+ iio_device_unregister(indio_dev);
+ iio_device_free(indio_dev);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int tsl45315_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct tsl45315_data *data = iio_priv(indio_dev);
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(data->client, TSL45315_CONTROL,
+ TSL45315_MODE_POWERDOWN);
+
+ return ret;
+}
+
+static int tsl45315_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ int ret;
+
+ ret = i2c_smbus_write_byte_data(client, TSL45315_CONTROL,
+ TSL45315_MODE_NORMAL);
+
+ return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(tsl45315_pm_ops, tsl45315_suspend, tsl45315_resume);
+#define TSL45315_PM_OPS (&tsl45315_pm_ops)
+#else
+#define TSL45315_PM_OPS NULL
+#endif
+
+static struct i2c_driver tsl45315_driver = {
+ .driver = {
+ .name = TSL45315_DRV_NAME,
+ .pm = TSL45315_PM_OPS,
+ .owner = THIS_MODULE,
+ },
+ .probe = tsl45315_probe,
+ .remove = tsl45315_remove,
+ .id_table = tsl45315_id,
+};
+
+module_i2c_driver(tsl45315_driver);
+
+MODULE_AUTHOR("Peter Meerwald <pmeerw@xxxxxxxxxx>");
+MODULE_DESCRIPTION("TAOS TSL45315 ambient light sensor driver");
+MODULE_LICENSE("GPL");
--
1.8.3
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