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165 lines
3.8 KiB
C
165 lines
3.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Support for ST VL53L0X FlightSense ToF Ranging Sensor on a i2c bus.
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*
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* Copyright (C) 2016 STMicroelectronics Imaging Division.
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* Copyright (C) 2018 Song Qiang <songqiang1304521@gmail.com>
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*
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* Datasheet available at
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* <https://www.st.com/resource/en/datasheet/vl53l0x.pdf>
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*
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* Default 7-bit i2c slave address 0x29.
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*
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* TODO: FIFO buffer, continuous mode, interrupts, range selection,
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* sensor ID check.
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*/
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/iio/iio.h>
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#define VL_REG_SYSRANGE_START 0x00
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#define VL_REG_SYSRANGE_MODE_MASK GENMASK(3, 0)
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#define VL_REG_SYSRANGE_MODE_SINGLESHOT 0x00
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#define VL_REG_SYSRANGE_MODE_START_STOP BIT(0)
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#define VL_REG_SYSRANGE_MODE_BACKTOBACK BIT(1)
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#define VL_REG_SYSRANGE_MODE_TIMED BIT(2)
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#define VL_REG_SYSRANGE_MODE_HISTOGRAM BIT(3)
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#define VL_REG_RESULT_INT_STATUS 0x13
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#define VL_REG_RESULT_RANGE_STATUS 0x14
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#define VL_REG_RESULT_RANGE_STATUS_COMPLETE BIT(0)
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struct vl53l0x_data {
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struct i2c_client *client;
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};
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static int vl53l0x_read_proximity(struct vl53l0x_data *data,
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const struct iio_chan_spec *chan,
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int *val)
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{
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struct i2c_client *client = data->client;
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u16 tries = 20;
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u8 buffer[12];
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int ret;
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ret = i2c_smbus_write_byte_data(client, VL_REG_SYSRANGE_START, 1);
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if (ret < 0)
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return ret;
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do {
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ret = i2c_smbus_read_byte_data(client,
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VL_REG_RESULT_RANGE_STATUS);
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if (ret < 0)
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return ret;
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if (ret & VL_REG_RESULT_RANGE_STATUS_COMPLETE)
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break;
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usleep_range(1000, 5000);
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} while (--tries);
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if (!tries)
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return -ETIMEDOUT;
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ret = i2c_smbus_read_i2c_block_data(client, VL_REG_RESULT_RANGE_STATUS,
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12, buffer);
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if (ret < 0)
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return ret;
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else if (ret != 12)
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return -EREMOTEIO;
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/* Values should be between 30~1200 in millimeters. */
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*val = (buffer[10] << 8) + buffer[11];
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return 0;
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}
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static const struct iio_chan_spec vl53l0x_channels[] = {
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{
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.type = IIO_DISTANCE,
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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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},
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};
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static int vl53l0x_read_raw(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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int *val, int *val2, long mask)
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{
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struct vl53l0x_data *data = iio_priv(indio_dev);
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int ret;
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if (chan->type != IIO_DISTANCE)
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return -EINVAL;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = vl53l0x_read_proximity(data, chan, val);
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if (ret < 0)
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return ret;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = 0;
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*val2 = 1000;
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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 const struct iio_info vl53l0x_info = {
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.read_raw = vl53l0x_read_raw,
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};
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static int vl53l0x_probe(struct i2c_client *client)
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{
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struct vl53l0x_data *data;
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struct iio_dev *indio_dev;
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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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data->client = client;
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i2c_set_clientdata(client, indio_dev);
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_READ_I2C_BLOCK |
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I2C_FUNC_SMBUS_BYTE_DATA))
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return -EOPNOTSUPP;
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indio_dev->dev.parent = &client->dev;
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indio_dev->name = "vl53l0x";
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indio_dev->info = &vl53l0x_info;
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indio_dev->channels = vl53l0x_channels;
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indio_dev->num_channels = ARRAY_SIZE(vl53l0x_channels);
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indio_dev->modes = INDIO_DIRECT_MODE;
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return devm_iio_device_register(&client->dev, indio_dev);
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}
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static const struct of_device_id st_vl53l0x_dt_match[] = {
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{ .compatible = "st,vl53l0x", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, st_vl53l0x_dt_match);
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static struct i2c_driver vl53l0x_driver = {
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.driver = {
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.name = "vl53l0x-i2c",
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.of_match_table = st_vl53l0x_dt_match,
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},
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.probe_new = vl53l0x_probe,
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};
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module_i2c_driver(vl53l0x_driver);
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MODULE_AUTHOR("Song Qiang <songqiang1304521@gmail.com>");
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MODULE_DESCRIPTION("ST vl53l0x ToF ranging sensor driver");
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MODULE_LICENSE("GPL v2");
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