[PATCH v14 0/2] iio: proximity: driver for vcnl3020

[PATCH v14 0/2] iio: proximity: driver for vcnl3020

[Ivan Mikhaylov]

Add proximity sensor driver for Vishay vcnl3020. Only on-demand
measurement is supported for now.

Changes from v13:
   1. description change for LED current.

Changes from v12:
   1. forgot to change path inside yaml.

Changes from v11:
   1. minor changes to yaml.

Changes from v10:
   1. add vcnl3020_property struct for optional properties.

Changes from v9:
   1. minor changes.
   2. pass microamps from dts, not register value.

Changes from v8:
   1. add vcnl3020 prefix into get_and_apply_property function.
   2. add bsd license into yaml.
   3. vishay,led-current-milliamp -> vishay,led-current-microamp.
   4. add default value into vishay,led-current-microamp and change
      register values into microamps.

Changes from v7:
   1. forgot to add Reviewed-by tag.

Changes from v6:
   1. minor changes
     1.1 remove VCNL_DRV_NAME
     1.2 add braces in get_and_apply_property

Changes from v5:
   1. add get_and_apply_property function for optional parameters.
   2. minor changes.

Changes from v4:
   1. add vdd-supply,vddio-supply,interrupts properties into yaml.
   2. led-current -> vishay,led-current-milliamp in yaml.
   3. add possible values enum list.
   4. add bulk_read for result hi/lo registers.
   5. add description of vcnl3020_data structure.
   6. vcnl3020 id table is removed.
   7. make "vishay,led-current-milliamp" optional in yaml and code.

Changes from v3:
   1. minor changes.
   2. add i2c block to fix dts section in yaml.

Changes from v2:
   1. using regmap_read_poll_timeout instead of do-while in measurement
      function.
   2. change struct i2client* in vcnl3020_data to struct dev*
   3. enable REGMAP_I2C in Kconfig

Changes from v1:
   1. using regmap interface instead of i2c_smbus_* calls.
   2. switch from probe to probe_new.
   3. s32/int32_t -> int

Ivan Mikhaylov (2):
  dt-bindings: proximity: provide vcnl3020 device tree binding document
  iio: proximity: Add driver support for vcnl3020 proximity sensor

 .../iio/proximity/vishay,vcnl3020.yaml        |  62 +++++
 drivers/iio/proximity/Kconfig                 |  11 +
 drivers/iio/proximity/Makefile                |   1 +
 drivers/iio/proximity/vcnl3020.c              | 258 ++++++++++++++++++
 4 files changed, 332 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/proximity/vishay,vcnl3020.yaml
 create mode 100644 drivers/iio/proximity/vcnl3020.c

-- 
2.21.1

[PATCH v14 1/2] dt-bindings: proximity: provide vcnl3020 device tree binding document

[Ivan Mikhaylov]

Mostly standard i2c driver with some additional led-current option
for vcnl3020.

Signed-off-by: Ivan Mikhaylov <i.mikhaylov@yadro.com>
---
 .../iio/proximity/vishay,vcnl3020.yaml        | 62 +++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/proximity/vishay,vcnl3020.yaml

diff --git a/Documentation/devicetree/bindings/iio/proximity/vishay,vcnl3020.yaml b/Documentation/devicetree/bindings/iio/proximity/vishay,vcnl3020.yaml
new file mode 100644
index 000000000000..f0101ed67435
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/proximity/vishay,vcnl3020.yaml
@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/proximity/vishay,vcnl3020.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Integrated Proximity Sensor With Infrared Emitter
+
+maintainers:
+  - Ivan Mikhaylov <i.mikhaylov@yadro.com>
+
+description: |
+  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.
+
+  Specifications about the devices can be found at:
+  https://www.vishay.com/docs/84150/vcnl3020.pdf
+
+properties:
+  compatible:
+    enum:
+      - vishay,vcnl3020
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  vdd-supply:
+    description: Regulator that provides power to the sensor
+
+  vddio-supply:
+    description: Regulator that provides power to the bus
+
+  vishay,led-current-microamp:
+    description:
+      The driver current for the LED used in proximity sensing.
+    enum: [0, 10000, 20000, 30000, 40000, 50000, 60000, 70000, 80000, 90000,
+          100000, 110000, 120000, 130000, 140000, 150000, 160000, 170000,
+          180000, 190000, 200000]
+    default: 20000
+
+required:
+  - compatible
+  - reg
+
+examples:
+  - |
+    i2c {
+
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        proximity@13 {
+              compatible = "vishay,vcnl3020";
+              reg = <0x13>;
+              vishay,led-current-microamp = <200000>;
+        };
+    };
-- 
2.21.1

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

[Ivan Mikhaylov]

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@yadro.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
---
 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@yadro.com>");
+MODULE_DESCRIPTION("Vishay VCNL3020 proximity sensor driver");
+MODULE_LICENSE("GPL");
-- 
2.21.1

Re: [PATCH v14 0/2] iio: proximity: driver for vcnl3020

[Jonathan Cameron]

On Sun, 10 May 2020 21:45:35 +0300
Ivan Mikhaylov <i.mikhaylov@yadro.com> wrote:

> Add proximity sensor driver for Vishay vcnl3020. Only on-demand
> measurement is supported for now.
Hi Ivan,

Great and thanks for your persistence on this driver!
All looks good to me.

I will give time or a dt-bindings review as so far only
Rob's bot as commented.  The look fine to me but as Rob
can certify I'm not very good at reviewing those things!

Thanks,

Jonathan

> 
> Changes from v13:
>    1. description change for LED current.
> 
> Changes from v12:
>    1. forgot to change path inside yaml.
> 
> Changes from v11:
>    1. minor changes to yaml.
> 
> Changes from v10:
>    1. add vcnl3020_property struct for optional properties.
> 
> Changes from v9:
>    1. minor changes.
>    2. pass microamps from dts, not register value.
> 
> Changes from v8:
>    1. add vcnl3020 prefix into get_and_apply_property function.
>    2. add bsd license into yaml.
>    3. vishay,led-current-milliamp -> vishay,led-current-microamp.
>    4. add default value into vishay,led-current-microamp and change
>       register values into microamps.
> 
> Changes from v7:
>    1. forgot to add Reviewed-by tag.
> 
> Changes from v6:
>    1. minor changes
>      1.1 remove VCNL_DRV_NAME
>      1.2 add braces in get_and_apply_property
> 
> Changes from v5:
>    1. add get_and_apply_property function for optional parameters.
>    2. minor changes.
> 
> Changes from v4:
>    1. add vdd-supply,vddio-supply,interrupts properties into yaml.
>    2. led-current -> vishay,led-current-milliamp in yaml.
>    3. add possible values enum list.
>    4. add bulk_read for result hi/lo registers.
>    5. add description of vcnl3020_data structure.
>    6. vcnl3020 id table is removed.
>    7. make "vishay,led-current-milliamp" optional in yaml and code.
> 
> Changes from v3:
>    1. minor changes.
>    2. add i2c block to fix dts section in yaml.
> 
> Changes from v2:
>    1. using regmap_read_poll_timeout instead of do-while in measurement
>       function.
>    2. change struct i2client* in vcnl3020_data to struct dev*
>    3. enable REGMAP_I2C in Kconfig
> 
> Changes from v1:
>    1. using regmap interface instead of i2c_smbus_* calls.
>    2. switch from probe to probe_new.
>    3. s32/int32_t -> int
> 
> Ivan Mikhaylov (2):
>   dt-bindings: proximity: provide vcnl3020 device tree binding document
>   iio: proximity: Add driver support for vcnl3020 proximity sensor
> 
>  .../iio/proximity/vishay,vcnl3020.yaml        |  62 +++++
>  drivers/iio/proximity/Kconfig                 |  11 +
>  drivers/iio/proximity/Makefile                |   1 +
>  drivers/iio/proximity/vcnl3020.c              | 258 ++++++++++++++++++
>  4 files changed, 332 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/proximity/vishay,vcnl3020.yaml
>  create mode 100644 drivers/iio/proximity/vcnl3020.c
> 

Re: [PATCH v14 1/2] dt-bindings: proximity: provide vcnl3020 device tree binding document

[Rob Herring]

On Sun, 10 May 2020 21:45:36 +0300, Ivan Mikhaylov wrote:
> Mostly standard i2c driver with some additional led-current option
> for vcnl3020.
> 
> Signed-off-by: Ivan Mikhaylov <i.mikhaylov@yadro.com>
> ---
>  .../iio/proximity/vishay,vcnl3020.yaml        | 62 +++++++++++++++++++
>  1 file changed, 62 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/proximity/vishay,vcnl3020.yaml
> 

Reviewed-by: Rob Herring <robh@kernel.org>

Re: [PATCH v14 1/2] dt-bindings: proximity: provide vcnl3020 device tree binding document

[Jonathan Cameron]

On Mon, 18 May 2020 14:41:44 -0600
Rob Herring <robh@kernel.org> wrote:

> On Sun, 10 May 2020 21:45:36 +0300, Ivan Mikhaylov wrote:
> > Mostly standard i2c driver with some additional led-current option
> > for vcnl3020.
> > 
> > Signed-off-by: Ivan Mikhaylov <i.mikhaylov@yadro.com>
> > ---
> >  .../iio/proximity/vishay,vcnl3020.yaml        | 62 +++++++++++++++++++
> >  1 file changed, 62 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/iio/proximity/vishay,vcnl3020.yaml
> >   
> 
> Reviewed-by: Rob Herring <robh@kernel.org>


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

Thanks,

Jonathan

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

[Jonathan Cameron]

On Sun, 10 May 2020 21:45:37 +0300
Ivan Mikhaylov <i.mikhaylov@yadro.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.
> 
> Datasheet: http://www.vishay.com/docs/84150/vcnl3020.pdf
> Signed-off-by: Ivan Mikhaylov <i.mikhaylov@yadro.com>
> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

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@yadro.com>");
> +MODULE_DESCRIPTION("Vishay VCNL3020 proximity sensor driver");
> +MODULE_LICENSE("GPL");