Re: [PATCH v14 2/2] iio: proximity: Add driver support for vcnl3020 proximity sensor

From: Jonathan Cameron
Date: Thu May 21 2020 - 14:14:37 EST

On Sun, 10 May 2020 21:45:37 +0300
Ivan Mikhaylov <i.mikhaylov@xxxxxxxxx> wrote:

> Proximity sensor driver based on light/vcnl4000.c code.
> For now supports only the single on-demand measurement.
>
> The VCNL3020 is a fully integrated proximity sensor. Fully
> integrated means that the infrared emitter is included in the
> package. It has 16-bit resolution. It includes a signal
> processing IC and features standard I2C communication
> interface. It features an interrupt function.
>
> Datasheet: http://www.vishay.com/docs/84150/vcnl3020.pdf
> Signed-off-by: Ivan Mikhaylov <i.mikhaylov@xxxxxxxxx>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>

Applied to the togreg branch of iio.git and pushed out as testing
or the autobuilders to play with it.

I 'might' manage to sneak a last pull request to Greg tomorrow
so this might make the coming merge window though we are cutting
it close so may go either way.

Thanks,

Jonathan

> ---
> drivers/iio/proximity/Kconfig | 11 ++
> drivers/iio/proximity/Makefile | 1 +
> drivers/iio/proximity/vcnl3020.c | 258 +++++++++++++++++++++++++++++++
> 3 files changed, 270 insertions(+)
> create mode 100644 drivers/iio/proximity/vcnl3020.c
>
> diff --git a/drivers/iio/proximity/Kconfig b/drivers/iio/proximity/Kconfig
> index d53601447da4..b8d2b17e60ac 100644
> --- a/drivers/iio/proximity/Kconfig
> +++ b/drivers/iio/proximity/Kconfig
> @@ -112,6 +112,17 @@ config SRF08
> To compile this driver as a module, choose M here: the
> module will be called srf08.
>
> +config VCNL3020
> + tristate "VCNL3020 proximity sensor"
> + select REGMAP_I2C
> + depends on I2C
> + help
> + Say Y here if you want to build a driver for the Vishay VCNL3020
> + proximity sensor.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called vcnl3020.
> +
> config VL53L0X_I2C
> tristate "STMicroelectronics VL53L0X ToF ranger sensor (I2C)"
> depends on I2C
> diff --git a/drivers/iio/proximity/Makefile b/drivers/iio/proximity/Makefile
> index 0bb5f9de13d6..8245978ced30 100644
> --- a/drivers/iio/proximity/Makefile
> +++ b/drivers/iio/proximity/Makefile
> @@ -12,5 +12,6 @@ obj-$(CONFIG_RFD77402) += rfd77402.o
> obj-$(CONFIG_SRF04) += srf04.o
> obj-$(CONFIG_SRF08) += srf08.o
> obj-$(CONFIG_SX9500) += sx9500.o
> +obj-$(CONFIG_VCNL3020) += vcnl3020.o
> obj-$(CONFIG_VL53L0X_I2C) += vl53l0x-i2c.o
>
> diff --git a/drivers/iio/proximity/vcnl3020.c b/drivers/iio/proximity/vcnl3020.c
> new file mode 100644
> index 000000000000..9ff1a164c2e6
> --- /dev/null
> +++ b/drivers/iio/proximity/vcnl3020.c
> @@ -0,0 +1,258 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Support for Vishay VCNL3020 proximity sensor on i2c bus.
> + * Based on Vishay VCNL4000 driver code.
> + *
> + * TODO: interrupts.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/i2c.h>
> +#include <linux/err.h>
> +#include <linux/delay.h>
> +#include <linux/regmap.h>
> +
> +#include <linux/iio/iio.h>
> +#include <linux/iio/sysfs.h>
> +
> +#define VCNL3020_PROD_ID 0x21
> +
> +#define VCNL_COMMAND 0x80 /* Command register */
> +#define VCNL_PROD_REV 0x81 /* Product ID and Revision ID */
> +#define VCNL_PROXIMITY_RATE 0x82 /* Rate of Proximity Measurement */
> +#define VCNL_LED_CURRENT 0x83 /* IR LED current for proximity mode */
> +#define VCNL_PS_RESULT_HI 0x87 /* Proximity result register, MSB */
> +#define VCNL_PS_RESULT_LO 0x88 /* Proximity result register, LSB */
> +#define VCNL_PS_ICR 0x89 /* Interrupt Control Register */
> +#define VCNL_PS_LO_THR_HI 0x8a /* High byte of low threshold value */
> +#define VCNL_PS_LO_THR_LO 0x8b /* Low byte of low threshold value */
> +#define VCNL_PS_HI_THR_HI 0x8c /* High byte of high threshold value */
> +#define VCNL_PS_HI_THR_LO 0x8d /* Low byte of high threshold value */
> +#define VCNL_ISR 0x8e /* Interrupt Status Register */
> +#define VCNL_PS_MOD_ADJ 0x8f /* Proximity Modulator Timing Adjustment */
> +
> +/* Bit masks for COMMAND register */
> +#define VCNL_PS_RDY BIT(5) /* proximity data ready? */
> +#define VCNL_PS_OD BIT(3) /* start on-demand proximity
> + * measurement
> + */
> +
> +#define VCNL_ON_DEMAND_TIMEOUT_US 100000
> +#define VCNL_POLL_US 20000
> +
> +/**
> + * struct vcnl3020_data - vcnl3020 specific data.
> + * @regmap: device register map.
> + * @dev: vcnl3020 device.
> + * @rev: revision id.
> + * @lock: lock for protecting access to device hardware registers.
> + */
> +struct vcnl3020_data {
> + struct regmap *regmap;
> + struct device *dev;
> + u8 rev;
> + struct mutex lock;
> +};
> +
> +/**
> + * struct vcnl3020_property - vcnl3020 property.
> + * @name: property name.
> + * @reg: i2c register offset.
> + * @conversion_func: conversion function.
> + */
> +struct vcnl3020_property {
> + const char *name;
> + u32 reg;
> + u32 (*conversion_func)(u32 *val);
> +};
> +
> +static u32 microamp_to_reg(u32 *val)
> +{
> + /*
> + * An example of conversion from uA to reg val:
> + * 200000 uA == 200 mA == 20
> + */
> + return *val /= 10000;
> +};
> +
> +static struct vcnl3020_property vcnl3020_led_current_property = {
> + .name = "vishay,led-current-microamp",
> + .reg = VCNL_LED_CURRENT,
> + .conversion_func = microamp_to_reg,
> +};
> +
> +static int vcnl3020_get_and_apply_property(struct vcnl3020_data *data,
> + struct vcnl3020_property prop)
> +{
> + int rc;
> + u32 val;
> +
> + rc = device_property_read_u32(data->dev, prop.name, &val);
> + if (rc)
> + return 0;
> +
> + if (prop.conversion_func)
> + prop.conversion_func(&val);
> +
> + rc = regmap_write(data->regmap, prop.reg, val);
> + if (rc) {
> + dev_err(data->dev, "Error (%d) setting property (%s)\n",
> + rc, prop.name);
> + }
> +
> + return rc;
> +}
> +
> +static int vcnl3020_init(struct vcnl3020_data *data)
> +{
> + int rc;
> + unsigned int reg;
> +
> + rc = regmap_read(data->regmap, VCNL_PROD_REV, &reg);
> + if (rc) {
> + dev_err(data->dev,
> + "Error (%d) reading product revision\n", rc);
> + return rc;
> + }
> +
> + if (reg != VCNL3020_PROD_ID) {
> + dev_err(data->dev,
> + "Product id (%x) did not match vcnl3020 (%x)\n", reg,
> + VCNL3020_PROD_ID);
> + return -ENODEV;
> + }
> +
> + data->rev = reg;
> + mutex_init(&data->lock);
> +
> + return vcnl3020_get_and_apply_property(data,
> + vcnl3020_led_current_property);
> +};
> +
> +static int vcnl3020_measure_proximity(struct vcnl3020_data *data, int *val)
> +{
> + int rc;
> + unsigned int reg;
> + __be16 res;
> +
> + mutex_lock(&data->lock);
> +
> + rc = regmap_write(data->regmap, VCNL_COMMAND, VCNL_PS_OD);
> + if (rc)
> + goto err_unlock;
> +
> + /* wait for data to become ready */
> + rc = regmap_read_poll_timeout(data->regmap, VCNL_COMMAND, reg,
> + reg & VCNL_PS_RDY, VCNL_POLL_US,
> + VCNL_ON_DEMAND_TIMEOUT_US);
> + if (rc) {
> + dev_err(data->dev,
> + "Error (%d) reading vcnl3020 command register\n", rc);
> + goto err_unlock;
> + }
> +
> + /* high & low result bytes read */
> + rc = regmap_bulk_read(data->regmap, VCNL_PS_RESULT_HI, &res,
> + sizeof(res));
> + if (rc)
> + goto err_unlock;
> +
> + *val = be16_to_cpu(res);
> +
> +err_unlock:
> + mutex_unlock(&data->lock);
> +
> + return rc;
> +}
> +
> +static const struct iio_chan_spec vcnl3020_channels[] = {
> + {
> + .type = IIO_PROXIMITY,
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> + },
> +};
> +
> +static int vcnl3020_read_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan, int *val,
> + int *val2, long mask)
> +{
> + int rc;
> + struct vcnl3020_data *data = iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_RAW:
> + rc = vcnl3020_measure_proximity(data, val);
> + if (rc)
> + return rc;
> + return IIO_VAL_INT;
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static const struct iio_info vcnl3020_info = {
> + .read_raw = vcnl3020_read_raw,
> +};
> +
> +static const struct regmap_config vcnl3020_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = VCNL_PS_MOD_ADJ,
> +};
> +
> +static int vcnl3020_probe(struct i2c_client *client)
> +{
> + struct vcnl3020_data *data;
> + struct iio_dev *indio_dev;
> + struct regmap *regmap;
> + int rc;
> +
> + regmap = devm_regmap_init_i2c(client, &vcnl3020_regmap_config);
> + if (IS_ERR(regmap)) {
> + dev_err(&client->dev, "regmap_init failed\n");
> + return PTR_ERR(regmap);
> + }
> +
> + 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->regmap = regmap;
> + data->dev = &client->dev;
> +
> + rc = vcnl3020_init(data);
> + if (rc)
> + return rc;
> +
> + indio_dev->dev.parent = &client->dev;
> + indio_dev->info = &vcnl3020_info;
> + indio_dev->channels = vcnl3020_channels;
> + indio_dev->num_channels = ARRAY_SIZE(vcnl3020_channels);
> + indio_dev->name = "vcnl3020";
> + indio_dev->modes = INDIO_DIRECT_MODE;
> +
> + return devm_iio_device_register(&client->dev, indio_dev);
> +}
> +
> +static const struct of_device_id vcnl3020_of_match[] = {
> + {
> + .compatible = "vishay,vcnl3020",
> + },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, vcnl3020_of_match);
> +
> +static struct i2c_driver vcnl3020_driver = {
> + .driver = {
> + .name = "vcnl3020",
> + .of_match_table = vcnl3020_of_match,
> + },
> + .probe_new = vcnl3020_probe,
> +};
> +module_i2c_driver(vcnl3020_driver);
> +
> +MODULE_AUTHOR("Ivan Mikhaylov <i.mikhaylov@xxxxxxxxx>");
> +MODULE_DESCRIPTION("Vishay VCNL3020 proximity sensor driver");
> +MODULE_LICENSE("GPL");