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Date: Mon, 6 Apr 2020 18:43:46 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Ivan Mikhaylov <i.mikhaylov@...ro.com>
Cc: Jonathan Cameron <jic23@...nel.org>,
Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald-Stadler <pmeerw@...erw.net>,
linux-iio <linux-iio@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
devicetree <devicetree@...r.kernel.org>,
Mark Rutland <mark.rutland@....com>,
Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH v7 2/2] iio: proximity: Add driver support for vcnl3020
proximity sensor
On Mon, Apr 6, 2020 at 6:18 PM Ivan Mikhaylov <i.mikhaylov@...ro.com> 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.
>
I don't know how to explain to you that if anybody gives the tag, you
need to add it to your commit message.
Why are you ignoring this?
Jonathan, my tag still applies here, but I'm so confused with the above.
> Datasheet: http://www.vishay.com/docs/84150/vcnl3020.pdf
> Signed-off-by: Ivan Mikhaylov <i.mikhaylov@...ro.com>
> ---
> drivers/iio/proximity/Kconfig | 11 ++
> drivers/iio/proximity/Makefile | 1 +
> drivers/iio/proximity/vcnl3020.c | 234 +++++++++++++++++++++++++++++++
> 3 files changed, 246 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..43282309a360
> --- /dev/null
> +++ b/drivers/iio/proximity/vcnl3020.c
> @@ -0,0 +1,234 @@
> +// 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;
> +};
> +
> +static int get_and_apply_property(struct vcnl3020_data *data, const char *prop,
> + u32 reg)
> +{
> + int rc;
> + u32 val;
> +
> + rc = device_property_read_u32(data->dev, prop, &val);
> + if (rc)
> + return 0;
> +
> + rc = regmap_write(data->regmap, reg, val);
> + if (rc) {
> + dev_err(data->dev, "Error (%d) setting property (%s)",
> + rc, prop);
> + }
> +
> + return rc;
> +}
> +
> +static int vcnl3020_init(struct vcnl3020_data *data)
> +{
> + int rc;
> + unsigned int reg;
> +
> + rc = regmap_read(data->regmap, VCNL_PROD_REV, ®);
> + if (rc) {
> + dev_err(data->dev,
> + "Error (%d) reading product revision", rc);
> + return rc;
> + }
> +
> + if (reg != VCNL3020_PROD_ID) {
> + dev_err(data->dev,
> + "Product id (%x) did not match vcnl3020 (%x)", reg,
> + VCNL3020_PROD_ID);
> + return -ENODEV;
> + }
> +
> + data->rev = reg;
> + mutex_init(&data->lock);
> +
> + return get_and_apply_property(data, "vishay,led-current-milliamp",
> + VCNL_LED_CURRENT);
> +};
> +
> +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", 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:
> + switch (chan->type) {
> + case IIO_PROXIMITY:
> + rc = vcnl3020_measure_proximity(data, val);
> + if (rc)
> + return rc;
> + return IIO_VAL_INT;
> + default:
> + return -EINVAL;
> + }
> + 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!");
> + 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@...ro.com>");
> +MODULE_DESCRIPTION("Vishay VCNL3020 proximity sensor driver");
> +MODULE_LICENSE("GPL");
> --
> 2.21.1
>
--
With Best Regards,
Andy Shevchenko
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