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iio: Add tsl4531 ambient light sensor driver
driver for the TSL4531 family of 16-bit I2C ambient light sensors; information is here: http://www.ams.com/eng/Products/Light-Sensors/Ambient-Light-Sensor-ALS/TSL45315 the chip offers simple lux output v3 (thanks Lars-Peter Clausen): * add mutex to when updating integration time * fix chip ID checking * code cleanups v2: * rename to tsl4351 * use INT_TIME Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Peter Meerwald
Jonathan Cameron
parent
caeac37422
commit
aab9ba7eb2
@ -65,6 +65,16 @@ config SENSORS_TSL2563
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This driver can also be built as a module. If so, the module
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will be called tsl2563.
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config TSL4531
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tristate "TAOS TSL4531 ambient light sensors"
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depends on I2C
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help
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Say Y here if you want to build a driver for the TAOS TSL4531 family
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of ambient light sensors with direct lux output.
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To compile this driver as a module, choose M here: the
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module will be called tsl4531.
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config VCNL4000
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tristate "VCNL4000 combined ALS and proximity sensor"
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depends on I2C
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@ -8,4 +8,5 @@ obj-$(CONFIG_APDS9300) += apds9300.o
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obj-$(CONFIG_HID_SENSOR_ALS) += hid-sensor-als.o
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obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o
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obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o
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obj-$(CONFIG_TSL4531) += tsl4531.o
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obj-$(CONFIG_VCNL4000) += vcnl4000.o
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258
drivers/iio/light/tsl4531.c
Normal file
258
drivers/iio/light/tsl4531.c
Normal file
@ -0,0 +1,258 @@
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/*
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* tsl4531.c - Support for TAOS TSL4531 ambient light sensor
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*
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* Copyright 2013 Peter Meerwald <pmeerw@pmeerw.net>
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*
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* IIO driver for the TSL4531x family
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* TSL45311/TSL45313: 7-bit I2C slave address 0x39
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* TSL45315/TSL45317: 7-bit I2C slave address 0x29
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*
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* TODO: single cycle measurement
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*/
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#include <linux/module.h>
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#include <linux/i2c.h>
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#include <linux/err.h>
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#include <linux/delay.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#define TSL4531_DRV_NAME "tsl4531"
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#define TCS3472_COMMAND BIT(7)
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#define TSL4531_CONTROL (TCS3472_COMMAND | 0x00)
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#define TSL4531_CONFIG (TCS3472_COMMAND | 0x01)
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#define TSL4531_DATA (TCS3472_COMMAND | 0x04)
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#define TSL4531_ID (TCS3472_COMMAND | 0x0a)
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/* operating modes in control register */
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#define TSL4531_MODE_POWERDOWN 0x00
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#define TSL4531_MODE_SINGLE_ADC 0x02
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#define TSL4531_MODE_NORMAL 0x03
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/* integration time control in config register */
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#define TSL4531_TCNTRL_400MS 0x00
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#define TSL4531_TCNTRL_200MS 0x01
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#define TSL4531_TCNTRL_100MS 0x02
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/* part number in id register */
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#define TSL45311_ID 0x8
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#define TSL45313_ID 0x9
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#define TSL45315_ID 0xa
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#define TSL45317_ID 0xb
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#define TSL4531_ID_SHIFT 4
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struct tsl4531_data {
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struct i2c_client *client;
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struct mutex lock;
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int int_time;
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};
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static IIO_CONST_ATTR_INT_TIME_AVAIL("0.1 0.2 0.4");
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static struct attribute *tsl4531_attributes[] = {
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&iio_const_attr_integration_time_available.dev_attr.attr,
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NULL
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};
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static const struct attribute_group tsl4531_attribute_group = {
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.attrs = tsl4531_attributes,
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};
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static const struct iio_chan_spec tsl4531_channels[] = {
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{
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.type = IIO_LIGHT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_INT_TIME)
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}
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};
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static int tsl4531_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct tsl4531_data *data = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = i2c_smbus_read_word_data(data->client,
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TSL4531_DATA);
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if (ret < 0)
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return ret;
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*val = ret;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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/* 0.. 1x, 1 .. 2x, 2 .. 4x */
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*val = 1 << data->int_time;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_INT_TIME:
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if (data->int_time == 0)
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*val2 = 400000;
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else if (data->int_time == 1)
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*val2 = 200000;
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else if (data->int_time == 2)
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*val2 = 100000;
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else
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return -EINVAL;
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*val = 0;
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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}
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}
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static int tsl4531_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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struct tsl4531_data *data = iio_priv(indio_dev);
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int int_time, ret;
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switch (mask) {
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case IIO_CHAN_INFO_INT_TIME:
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if (val != 0)
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return -EINVAL;
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if (val2 == 400000)
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int_time = 0;
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else if (val2 == 200000)
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int_time = 1;
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else if (val2 == 100000)
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int_time = 2;
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else
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return -EINVAL;
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mutex_lock(&data->lock);
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ret = i2c_smbus_write_byte_data(data->client,
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TSL4531_CONFIG, int_time);
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if (ret >= 0)
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data->int_time = int_time;
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mutex_unlock(&data->lock);
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return ret;
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info tsl4531_info = {
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.read_raw = tsl4531_read_raw,
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.write_raw = tsl4531_write_raw,
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.attrs = &tsl4531_attribute_group,
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.driver_module = THIS_MODULE,
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};
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static int tsl4531_check_id(struct i2c_client *client)
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{
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int ret = i2c_smbus_read_byte_data(client, TSL4531_ID);
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if (ret < 0)
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return ret;
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switch (ret >> TSL4531_ID_SHIFT) {
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case TSL45311_ID:
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case TSL45313_ID:
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case TSL45315_ID:
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case TSL45317_ID:
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return 1;
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default:
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return 0;
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}
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}
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static int tsl4531_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct tsl4531_data *data;
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struct iio_dev *indio_dev;
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int ret;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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mutex_init(&data->lock);
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if (!tsl4531_check_id(client)) {
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dev_err(&client->dev, "no TSL4531 sensor\n");
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return -ENODEV;
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}
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ret = i2c_smbus_write_byte_data(data->client, TSL4531_CONTROL,
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TSL4531_MODE_NORMAL);
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if (ret < 0)
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return ret;
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ret = i2c_smbus_write_byte_data(data->client, TSL4531_CONFIG,
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TSL4531_TCNTRL_400MS);
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if (ret < 0)
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return ret;
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indio_dev->dev.parent = &client->dev;
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indio_dev->info = &tsl4531_info;
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indio_dev->channels = tsl4531_channels;
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indio_dev->num_channels = ARRAY_SIZE(tsl4531_channels);
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indio_dev->name = TSL4531_DRV_NAME;
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indio_dev->modes = INDIO_DIRECT_MODE;
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return iio_device_register(indio_dev);
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}
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static int tsl4531_powerdown(struct i2c_client *client)
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{
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return i2c_smbus_write_byte_data(client, TSL4531_CONTROL,
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TSL4531_MODE_POWERDOWN);
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}
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static int tsl4531_remove(struct i2c_client *client)
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{
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iio_device_unregister(i2c_get_clientdata(client));
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tsl4531_powerdown(client);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int tsl4531_suspend(struct device *dev)
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{
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return tsl4531_powerdown(to_i2c_client(dev));
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}
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static int tsl4531_resume(struct device *dev)
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{
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return i2c_smbus_write_byte_data(to_i2c_client(dev), TSL4531_CONTROL,
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TSL4531_MODE_NORMAL);
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}
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#endif
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static SIMPLE_DEV_PM_OPS(tsl4531_pm_ops, tsl4531_suspend, tsl4531_resume);
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static const struct i2c_device_id tsl4531_id[] = {
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{ "tsl4531", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tsl4531_id);
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static struct i2c_driver tsl4531_driver = {
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.driver = {
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.name = TSL4531_DRV_NAME,
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.pm = &tsl4531_pm_ops,
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.owner = THIS_MODULE,
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},
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.probe = tsl4531_probe,
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.remove = tsl4531_remove,
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.id_table = tsl4531_id,
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};
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module_i2c_driver(tsl4531_driver);
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MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
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MODULE_DESCRIPTION("TAOS TSL4531 ambient light sensors driver");
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MODULE_LICENSE("GPL");
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