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1// SPDX-License-Identifier: GPL-2.02/*3 * Support for ST VL53L0X FlightSense ToF Ranging Sensor on a i2c bus.4 *5 * Copyright (C) 2016 STMicroelectronics Imaging Division.6 * Copyright (C) 2018 Song Qiang <songqiang1304521@gmail.com>7 * Copyright (C) 2020 Ivan Drobyshevskyi <drobyshevskyi@gmail.com>8 *9 * Datasheet available at10 * <https://www.st.com/resource/en/datasheet/vl53l0x.pdf>11 *12 * Default 7-bit i2c slave address 0x29.13 *14 * TODO: FIFO buffer, continuous mode, range selection, sensor ID check.15 */16 17#include <linux/delay.h>18#include <linux/gpio/consumer.h>19#include <linux/i2c.h>20#include <linux/irq.h>21#include <linux/interrupt.h>22#include <linux/module.h>23 24#include <linux/iio/iio.h>25 26#define VL_REG_SYSRANGE_START				0x0027 28#define VL_REG_SYSRANGE_MODE_MASK			GENMASK(3, 0)29#define VL_REG_SYSRANGE_MODE_SINGLESHOT			0x0030#define VL_REG_SYSRANGE_MODE_START_STOP			BIT(0)31#define VL_REG_SYSRANGE_MODE_BACKTOBACK			BIT(1)32#define VL_REG_SYSRANGE_MODE_TIMED			BIT(2)33#define VL_REG_SYSRANGE_MODE_HISTOGRAM			BIT(3)34 35#define VL_REG_SYSTEM_INTERRUPT_CONFIG_GPIO		0x0A36#define VL_REG_SYSTEM_INTERRUPT_GPIO_NEW_SAMPLE_READY	BIT(2)37 38#define VL_REG_SYSTEM_INTERRUPT_CLEAR			0x0B39 40#define VL_REG_RESULT_INT_STATUS			0x1341#define VL_REG_RESULT_RANGE_STATUS			0x1442#define VL_REG_RESULT_RANGE_STATUS_COMPLETE		BIT(0)43 44struct vl53l0x_data {45	struct i2c_client *client;46	struct completion completion;47	struct regulator *vdd_supply;48	struct gpio_desc *reset_gpio;49};50 51static irqreturn_t vl53l0x_handle_irq(int irq, void *priv)52{53	struct iio_dev *indio_dev = priv;54	struct vl53l0x_data *data = iio_priv(indio_dev);55 56	complete(&data->completion);57 58	return IRQ_HANDLED;59}60 61static int vl53l0x_configure_irq(struct i2c_client *client,62				 struct iio_dev *indio_dev)63{64	int irq_flags = irq_get_trigger_type(client->irq);65	struct vl53l0x_data *data = iio_priv(indio_dev);66	int ret;67 68	if (!irq_flags)69		irq_flags = IRQF_TRIGGER_FALLING;70 71	ret = devm_request_irq(&client->dev, client->irq, vl53l0x_handle_irq,72			irq_flags, indio_dev->name, indio_dev);73	if (ret) {74		dev_err(&client->dev, "devm_request_irq error: %d\n", ret);75		return ret;76	}77 78	ret = i2c_smbus_write_byte_data(data->client,79			VL_REG_SYSTEM_INTERRUPT_CONFIG_GPIO,80			VL_REG_SYSTEM_INTERRUPT_GPIO_NEW_SAMPLE_READY);81	if (ret < 0)82		dev_err(&client->dev, "failed to configure IRQ: %d\n", ret);83 84	return ret;85}86 87static void vl53l0x_clear_irq(struct vl53l0x_data *data)88{89	struct device *dev = &data->client->dev;90	int ret;91 92	ret = i2c_smbus_write_byte_data(data->client,93					VL_REG_SYSTEM_INTERRUPT_CLEAR, 1);94	if (ret < 0)95		dev_err(dev, "failed to clear error irq: %d\n", ret);96 97	ret = i2c_smbus_write_byte_data(data->client,98					VL_REG_SYSTEM_INTERRUPT_CLEAR, 0);99	if (ret < 0)100		dev_err(dev, "failed to clear range irq: %d\n", ret);101 102	ret = i2c_smbus_read_byte_data(data->client, VL_REG_RESULT_INT_STATUS);103	if (ret < 0 || ret & 0x07)104		dev_err(dev, "failed to clear irq: %d\n", ret);105}106 107static int vl53l0x_read_proximity(struct vl53l0x_data *data,108				  const struct iio_chan_spec *chan,109				  int *val)110{111	struct i2c_client *client = data->client;112	u16 tries = 20;113	u8 buffer[12];114	int ret;115	unsigned long time_left;116 117	ret = i2c_smbus_write_byte_data(client, VL_REG_SYSRANGE_START, 1);118	if (ret < 0)119		return ret;120 121	if (data->client->irq) {122		reinit_completion(&data->completion);123 124		time_left = wait_for_completion_timeout(&data->completion, HZ/10);125		if (time_left == 0)126			return -ETIMEDOUT;127 128		vl53l0x_clear_irq(data);129	} else {130		do {131			ret = i2c_smbus_read_byte_data(client,132					       VL_REG_RESULT_RANGE_STATUS);133			if (ret < 0)134				return ret;135 136			if (ret & VL_REG_RESULT_RANGE_STATUS_COMPLETE)137				break;138 139			usleep_range(1000, 5000);140		} while (--tries);141		if (!tries)142			return -ETIMEDOUT;143	}144 145	ret = i2c_smbus_read_i2c_block_data(client, VL_REG_RESULT_RANGE_STATUS,146					    12, buffer);147	if (ret < 0)148		return ret;149	else if (ret != 12)150		return -EREMOTEIO;151 152	/* Values should be between 30~1200 in millimeters. */153	*val = (buffer[10] << 8) + buffer[11];154 155	return 0;156}157 158static const struct iio_chan_spec vl53l0x_channels[] = {159	{160		.type = IIO_DISTANCE,161		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |162				      BIT(IIO_CHAN_INFO_SCALE),163	},164};165 166static int vl53l0x_read_raw(struct iio_dev *indio_dev,167			    const struct iio_chan_spec *chan,168			    int *val, int *val2, long mask)169{170	struct vl53l0x_data *data = iio_priv(indio_dev);171	int ret;172 173	if (chan->type != IIO_DISTANCE)174		return -EINVAL;175 176	switch (mask) {177	case IIO_CHAN_INFO_RAW:178		ret = vl53l0x_read_proximity(data, chan, val);179		if (ret < 0)180			return ret;181 182		return IIO_VAL_INT;183	case IIO_CHAN_INFO_SCALE:184		*val = 0;185		*val2 = 1000;186 187		return IIO_VAL_INT_PLUS_MICRO;188	default:189		return -EINVAL;190	}191}192 193static const struct iio_info vl53l0x_info = {194	.read_raw = vl53l0x_read_raw,195};196 197static void vl53l0x_power_off(void *_data)198{199	struct vl53l0x_data *data = _data;200 201	gpiod_set_value_cansleep(data->reset_gpio, 1);202 203	regulator_disable(data->vdd_supply);204}205 206static int vl53l0x_power_on(struct vl53l0x_data *data)207{208	int ret;209 210	ret = regulator_enable(data->vdd_supply);211	if (ret)212		return ret;213 214	gpiod_set_value_cansleep(data->reset_gpio, 0);215 216	usleep_range(3200, 5000);217 218	return 0;219}220 221static int vl53l0x_probe(struct i2c_client *client)222{223	struct vl53l0x_data *data;224	struct iio_dev *indio_dev;225	int error;226 227	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));228	if (!indio_dev)229		return -ENOMEM;230 231	data = iio_priv(indio_dev);232	data->client = client;233	i2c_set_clientdata(client, indio_dev);234 235	if (!i2c_check_functionality(client->adapter,236				     I2C_FUNC_SMBUS_READ_I2C_BLOCK |237				     I2C_FUNC_SMBUS_BYTE_DATA))238		return -EOPNOTSUPP;239 240	data->vdd_supply = devm_regulator_get(&client->dev, "vdd");241	if (IS_ERR(data->vdd_supply))242		return dev_err_probe(&client->dev, PTR_ERR(data->vdd_supply),243				     "Unable to get VDD regulator\n");244 245	data->reset_gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_HIGH);246	if (IS_ERR(data->reset_gpio))247		return dev_err_probe(&client->dev, PTR_ERR(data->reset_gpio),248				     "Cannot get reset GPIO\n");249 250	error = vl53l0x_power_on(data);251	if (error)252		return dev_err_probe(&client->dev, error,253				     "Failed to power on the chip\n");254 255	error = devm_add_action_or_reset(&client->dev, vl53l0x_power_off, data);256	if (error)257		return dev_err_probe(&client->dev, error,258				     "Failed to install poweroff action\n");259 260	indio_dev->name = "vl53l0x";261	indio_dev->info = &vl53l0x_info;262	indio_dev->channels = vl53l0x_channels;263	indio_dev->num_channels = ARRAY_SIZE(vl53l0x_channels);264	indio_dev->modes = INDIO_DIRECT_MODE;265 266	/* usage of interrupt is optional */267	if (client->irq) {268		int ret;269 270		init_completion(&data->completion);271 272		ret = vl53l0x_configure_irq(client, indio_dev);273		if (ret)274			return ret;275	}276 277	return devm_iio_device_register(&client->dev, indio_dev);278}279 280static const struct i2c_device_id vl53l0x_id[] = {281	{ "vl53l0x" },282	{ }283};284MODULE_DEVICE_TABLE(i2c, vl53l0x_id);285 286static const struct of_device_id st_vl53l0x_dt_match[] = {287	{ .compatible = "st,vl53l0x", },288	{ }289};290MODULE_DEVICE_TABLE(of, st_vl53l0x_dt_match);291 292static struct i2c_driver vl53l0x_driver = {293	.driver = {294		.name = "vl53l0x-i2c",295		.of_match_table = st_vl53l0x_dt_match,296	},297	.probe = vl53l0x_probe,298	.id_table = vl53l0x_id,299};300module_i2c_driver(vl53l0x_driver);301 302MODULE_AUTHOR("Song Qiang <songqiang1304521@gmail.com>");303MODULE_DESCRIPTION("ST vl53l0x ToF ranging sensor driver");304MODULE_LICENSE("GPL v2");305