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Subject[PATCH 2/2] iio: proximity: Add driver support for vcnl3020 proximity sensor
Date
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 available at:
http://www.vishay.com/docs/84150/vcnl3020.pdf

Signed-off-by: Ivan Mikhaylov <i.mikhaylov@yadro.com>
---
drivers/iio/proximity/Kconfig | 10 ++
drivers/iio/proximity/Makefile | 1 +
drivers/iio/proximity/vcnl3020.c | 233 +++++++++++++++++++++++++++++++
3 files changed, 244 insertions(+)
create mode 100644 drivers/iio/proximity/vcnl3020.c

diff --git a/drivers/iio/proximity/Kconfig b/drivers/iio/proximity/Kconfig
index d53601447da4..936cd181916a 100644
--- a/drivers/iio/proximity/Kconfig
+++ b/drivers/iio/proximity/Kconfig
@@ -123,4 +123,14 @@ config VL53L0X_I2C
To compile this driver as a module, choose M here: the
module will be called vl53l0x-i2c.

+config VCNL3020
+ tristate "VCNL3020 proximity sensor"
+ 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.
+
endmenu
diff --git a/drivers/iio/proximity/Makefile b/drivers/iio/proximity/Makefile
index 0bb5f9de13d6..96b6330e90ff 100644
--- a/drivers/iio/proximity/Makefile
+++ b/drivers/iio/proximity/Makefile
@@ -13,4 +13,5 @@ obj-$(CONFIG_SRF04) += srf04.o
obj-$(CONFIG_SRF08) += srf08.o
obj-$(CONFIG_SX9500) += sx9500.o
obj-$(CONFIG_VL53L0X_I2C) += vl53l0x-i2c.o
+obj-$(CONFIG_VCNL3020) += vcnl3020.o

diff --git a/drivers/iio/proximity/vcnl3020.c b/drivers/iio/proximity/vcnl3020.c
new file mode 100644
index 000000000000..f6d9a21eed0b
--- /dev/null
+++ b/drivers/iio/proximity/vcnl3020.c
@@ -0,0 +1,233 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * vcnl3020.c - Support for Vishay VCNL3020 proximity sensor
+ *
+ * based on vcnl4000.c
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define VCNL_DRV_NAME "vcnl3020"
+#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
+ */
+
+struct vcnl3020_data {
+ struct i2c_client *client;
+ u32 rev;
+ struct mutex vcnl3020_lock; /* for i2c operations */
+};
+
+static const struct i2c_device_id vcnl3020_id[] = {
+ { "vcnl3020", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, vcnl3020_id);
+
+static int32_t vcnl3020_init(struct vcnl3020_data *data)
+{
+ s32 rc;
+ u32 led_current;
+ struct device *dev = &data->client->dev;
+
+ rc = device_property_read_u32(dev, "led-current", &led_current);
+ if (rc) {
+ dev_err(dev, "Couldn't get led current (%d)", rc);
+ goto exit;
+ }
+
+ rc = i2c_smbus_read_byte_data(data->client, VCNL_PROD_REV);
+ if (rc < 0) {
+ dev_err(dev, "Error (%d) reading product revision", rc);
+ goto exit;
+ }
+
+ if (rc == VCNL3020_PROD_ID) {
+ data->rev = rc & 0xff;
+ mutex_init(&data->vcnl3020_lock);
+ } else {
+ dev_err(dev, "Product id (%x) did not match vcnl3020 (%x)", rc,
+ VCNL3020_PROD_ID);
+ rc = -ENODEV;
+ goto exit;
+ }
+
+ /* set led current */
+ rc = i2c_smbus_write_byte_data(data->client, VCNL_LED_CURRENT,
+ led_current);
+ if (rc < 0) {
+ dev_err(dev, "Error (%d) setting LED current", rc);
+ goto exit;
+ }
+
+ return 0;
+exit:
+ return rc;
+};
+
+static int32_t vcnl3020_measure_proximity(struct vcnl3020_data *data,
+ int32_t *val)
+{
+ s32 tries = 20;
+ s32 rc;
+
+ mutex_lock(&data->vcnl3020_lock);
+
+ rc = i2c_smbus_write_byte_data(data->client, VCNL_COMMAND,
+ VCNL_PS_OD);
+ if (rc < 0)
+ goto fail;
+
+ /* wait for data to become ready */
+ while (tries--) {
+ rc = i2c_smbus_read_byte_data(data->client, VCNL_COMMAND);
+ if (rc < 0)
+ goto fail;
+ if (rc & VCNL_PS_RDY)
+ break;
+ msleep(20); /* measurement takes up to 100 ms */
+ }
+
+ if (tries < 0) {
+ dev_err(&data->client->dev,
+ "vcnl3020_measure() failed, data is not ready");
+ rc = -EIO;
+ goto fail;
+ }
+
+ rc = i2c_smbus_read_byte_data(data->client, VCNL_PS_RESULT_HI);
+ if (rc < 0)
+ goto fail;
+ *val = (rc & 0xff) << 8;
+ dev_dbg(&data->client->dev, "result high byte 0x%x", rc);
+
+ rc = i2c_smbus_read_byte_data(data->client, VCNL_PS_RESULT_LO);
+ if (rc < 0)
+ goto fail;
+ *val |= rc & 0xff;
+ dev_dbg(&data->client->dev, "result low byte 0x%x", rc);
+
+fail:
+ mutex_unlock(&data->vcnl3020_lock);
+
+ return rc;
+}
+
+static const struct iio_chan_spec vcnl3020_channels[] = {
+ {
+ .type = IIO_PROXIMITY,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ }
+};
+
+static int32_t vcnl3020_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ s32 *val, s32 *val2, long mask)
+{
+ s32 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 < 0)
+ 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 int32_t vcnl3020_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct vcnl3020_data *data;
+ struct iio_dev *indio_dev;
+ s32 rc;
+
+ 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->client = client;
+
+ rc = vcnl3020_init(data);
+ if (rc < 0)
+ goto out;
+
+ dev_info(&client->dev, "Proximity sensor, Rev: %02x\n",
+ data->rev);
+
+ 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 = VCNL_DRV_NAME;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ rc = devm_iio_device_register(&client->dev, indio_dev);
+ if (rc != 0)
+ goto out;
+
+ return rc;
+out:
+ devm_iio_device_free(&client->dev, indio_dev);
+ return rc;
+}
+
+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 = VCNL_DRV_NAME,
+ .of_match_table = vcnl3020_of_match,
+ },
+ .probe = vcnl3020_probe,
+ .id_table = vcnl3020_id,
+};
+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
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