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path: root/drivers/iio/proximity/vcnl3020.c
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Diffstat (limited to 'drivers/iio/proximity/vcnl3020.c')
-rw-r--r--drivers/iio/proximity/vcnl3020.c671
1 files changed, 671 insertions, 0 deletions
diff --git a/drivers/iio/proximity/vcnl3020.c b/drivers/iio/proximity/vcnl3020.c
new file mode 100644
index 000000000..cbc8400c7
--- /dev/null
+++ b/drivers/iio/proximity/vcnl3020.c
@@ -0,0 +1,671 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Support for Vishay VCNL3020 proximity sensor on i2c bus.
+ * Based on Vishay VCNL4000 driver code.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/regmap.h>
+#include <linux/interrupt.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/events.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
+ */
+
+/* Enables periodic proximity measurement */
+#define VCNL_PS_EN BIT(1)
+
+/* Enables state machine and LP oscillator for self timed measurements */
+#define VCNL_PS_SELFTIMED_EN BIT(0)
+
+/* Bit masks for ICR */
+
+/* Enable interrupts on low or high thresholds */
+#define VCNL_ICR_THRES_EN BIT(1)
+
+/* Bit masks for ISR */
+#define VCNL_INT_TH_HI BIT(0) /* High threshold hit */
+#define VCNL_INT_TH_LOW BIT(1) /* Low threshold hit */
+
+#define VCNL_ON_DEMAND_TIMEOUT_US 100000
+#define VCNL_POLL_US 20000
+
+static const int vcnl3020_prox_sampling_frequency[][2] = {
+ {1, 950000},
+ {3, 906250},
+ {7, 812500},
+ {16, 625000},
+ {31, 250000},
+ {62, 500000},
+ {125, 0},
+ {250, 0},
+};
+
+/**
+ * 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.
+ * @buf: __be16 buffer.
+ */
+struct vcnl3020_data {
+ struct regmap *regmap;
+ struct device *dev;
+ u8 rev;
+ struct mutex lock;
+ __be16 buf;
+};
+
+/**
+ * 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 bool vcnl3020_is_in_periodic_mode(struct vcnl3020_data *data)
+{
+ int rc;
+ unsigned int cmd;
+
+ rc = regmap_read(data->regmap, VCNL_COMMAND, &cmd);
+ if (rc) {
+ dev_err(data->dev,
+ "Error (%d) reading command register\n", rc);
+ return false;
+ }
+
+ return !!(cmd & VCNL_PS_SELFTIMED_EN);
+}
+
+static int vcnl3020_measure_proximity(struct vcnl3020_data *data, int *val)
+{
+ int rc;
+ unsigned int reg;
+
+ mutex_lock(&data->lock);
+
+ /* Protect against event capture. */
+ if (vcnl3020_is_in_periodic_mode(data)) {
+ rc = -EBUSY;
+ goto err_unlock;
+ }
+
+ 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, &data->buf,
+ sizeof(data->buf));
+ if (rc)
+ goto err_unlock;
+
+ *val = be16_to_cpu(data->buf);
+
+err_unlock:
+ mutex_unlock(&data->lock);
+
+ return rc;
+}
+
+static int vcnl3020_read_proxy_samp_freq(struct vcnl3020_data *data, int *val,
+ int *val2)
+{
+ int rc;
+ unsigned int prox_rate;
+
+ rc = regmap_read(data->regmap, VCNL_PROXIMITY_RATE, &prox_rate);
+ if (rc)
+ return rc;
+
+ if (prox_rate >= ARRAY_SIZE(vcnl3020_prox_sampling_frequency))
+ return -EINVAL;
+
+ *val = vcnl3020_prox_sampling_frequency[prox_rate][0];
+ *val2 = vcnl3020_prox_sampling_frequency[prox_rate][1];
+
+ return 0;
+}
+
+static int vcnl3020_write_proxy_samp_freq(struct vcnl3020_data *data, int val,
+ int val2)
+{
+ unsigned int i;
+ int index = -1;
+ int rc;
+
+ mutex_lock(&data->lock);
+
+ /* Protect against event capture. */
+ if (vcnl3020_is_in_periodic_mode(data)) {
+ rc = -EBUSY;
+ goto err_unlock;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(vcnl3020_prox_sampling_frequency); i++) {
+ if (val == vcnl3020_prox_sampling_frequency[i][0] &&
+ val2 == vcnl3020_prox_sampling_frequency[i][1]) {
+ index = i;
+ break;
+ }
+ }
+
+ if (index < 0) {
+ rc = -EINVAL;
+ goto err_unlock;
+ }
+
+ rc = regmap_write(data->regmap, VCNL_PROXIMITY_RATE, index);
+ if (rc)
+ dev_err(data->dev,
+ "Error (%d) writing proximity rate register\n", rc);
+
+err_unlock:
+ mutex_unlock(&data->lock);
+
+ return rc;
+}
+
+static bool vcnl3020_is_thr_enabled(struct vcnl3020_data *data)
+{
+ int rc;
+ unsigned int icr;
+
+ rc = regmap_read(data->regmap, VCNL_PS_ICR, &icr);
+ if (rc) {
+ dev_err(data->dev,
+ "Error (%d) reading ICR register\n", rc);
+ return false;
+ }
+
+ return !!(icr & VCNL_ICR_THRES_EN);
+}
+
+static int vcnl3020_read_event(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info,
+ int *val, int *val2)
+{
+ int rc;
+ struct vcnl3020_data *data = iio_priv(indio_dev);
+
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ rc = regmap_bulk_read(data->regmap, VCNL_PS_HI_THR_HI,
+ &data->buf, sizeof(data->buf));
+ if (rc < 0)
+ return rc;
+ *val = be16_to_cpu(data->buf);
+ return IIO_VAL_INT;
+ case IIO_EV_DIR_FALLING:
+ rc = regmap_bulk_read(data->regmap, VCNL_PS_LO_THR_HI,
+ &data->buf, sizeof(data->buf));
+ if (rc < 0)
+ return rc;
+ *val = be16_to_cpu(data->buf);
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+static int vcnl3020_write_event(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info,
+ int val, int val2)
+{
+ int rc;
+ struct vcnl3020_data *data = iio_priv(indio_dev);
+
+ mutex_lock(&data->lock);
+
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ /* 16 bit word/ low * high */
+ data->buf = cpu_to_be16(val);
+ rc = regmap_bulk_write(data->regmap, VCNL_PS_HI_THR_HI,
+ &data->buf, sizeof(data->buf));
+ if (rc < 0)
+ goto err_unlock;
+ rc = IIO_VAL_INT;
+ goto err_unlock;
+ case IIO_EV_DIR_FALLING:
+ data->buf = cpu_to_be16(val);
+ rc = regmap_bulk_write(data->regmap, VCNL_PS_LO_THR_HI,
+ &data->buf, sizeof(data->buf));
+ if (rc < 0)
+ goto err_unlock;
+ rc = IIO_VAL_INT;
+ goto err_unlock;
+ default:
+ rc = -EINVAL;
+ goto err_unlock;
+ }
+ default:
+ rc = -EINVAL;
+ goto err_unlock;
+ }
+err_unlock:
+ mutex_unlock(&data->lock);
+
+ return rc;
+}
+
+static int vcnl3020_enable_periodic(struct iio_dev *indio_dev,
+ struct vcnl3020_data *data)
+{
+ int rc;
+ int cmd;
+
+ mutex_lock(&data->lock);
+
+ /* Enable periodic measurement of proximity data. */
+ cmd = VCNL_PS_EN | VCNL_PS_SELFTIMED_EN;
+
+ rc = regmap_write(data->regmap, VCNL_COMMAND, cmd);
+ if (rc) {
+ dev_err(data->dev,
+ "Error (%d) writing command register\n", rc);
+ goto err_unlock;
+ }
+
+ /*
+ * Enable interrupts on threshold, for proximity data by
+ * default.
+ */
+ rc = regmap_write(data->regmap, VCNL_PS_ICR, VCNL_ICR_THRES_EN);
+ if (rc)
+ dev_err(data->dev,
+ "Error (%d) reading ICR register\n", rc);
+
+err_unlock:
+ mutex_unlock(&data->lock);
+
+ return rc;
+}
+
+static int vcnl3020_disable_periodic(struct iio_dev *indio_dev,
+ struct vcnl3020_data *data)
+{
+ int rc;
+
+ mutex_lock(&data->lock);
+
+ rc = regmap_write(data->regmap, VCNL_COMMAND, 0);
+ if (rc) {
+ dev_err(data->dev,
+ "Error (%d) writing command register\n", rc);
+ goto err_unlock;
+ }
+
+ rc = regmap_write(data->regmap, VCNL_PS_ICR, 0);
+ if (rc) {
+ dev_err(data->dev,
+ "Error (%d) writing ICR register\n", rc);
+ goto err_unlock;
+ }
+
+ /* Clear interrupt flag bit */
+ rc = regmap_write(data->regmap, VCNL_ISR, 0);
+ if (rc)
+ dev_err(data->dev,
+ "Error (%d) writing ISR register\n", rc);
+
+err_unlock:
+ mutex_unlock(&data->lock);
+
+ return rc;
+}
+
+static int vcnl3020_config_threshold(struct iio_dev *indio_dev, bool state)
+{
+ struct vcnl3020_data *data = iio_priv(indio_dev);
+
+ if (state) {
+ return vcnl3020_enable_periodic(indio_dev, data);
+ } else {
+ if (!vcnl3020_is_thr_enabled(data))
+ return 0;
+ return vcnl3020_disable_periodic(indio_dev, data);
+ }
+}
+
+static int vcnl3020_write_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ int state)
+{
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ return vcnl3020_config_threshold(indio_dev, state);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int vcnl3020_read_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir)
+{
+ struct vcnl3020_data *data = iio_priv(indio_dev);
+
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ return vcnl3020_is_thr_enabled(data);
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_event_spec vcnl3020_event_spec[] = {
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE),
+ }, {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_FALLING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE),
+ }, {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_EITHER,
+ .mask_separate = BIT(IIO_EV_INFO_ENABLE),
+ },
+};
+
+static const struct iio_chan_spec vcnl3020_channels[] = {
+ {
+ .type = IIO_PROXIMITY,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .info_mask_separate_available = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .event_spec = vcnl3020_event_spec,
+ .num_event_specs = ARRAY_SIZE(vcnl3020_event_spec),
+ },
+};
+
+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;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ rc = vcnl3020_read_proxy_samp_freq(data, val, val2);
+ if (rc < 0)
+ return rc;
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int vcnl3020_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct vcnl3020_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ return vcnl3020_write_proxy_samp_freq(data, val, val2);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int vcnl3020_read_avail(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ const int **vals, int *type, int *length,
+ long mask)
+{
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ *vals = (int *)vcnl3020_prox_sampling_frequency;
+ *type = IIO_VAL_INT_PLUS_MICRO;
+ *length = 2 * ARRAY_SIZE(vcnl3020_prox_sampling_frequency);
+ return IIO_AVAIL_LIST;
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_info vcnl3020_info = {
+ .read_raw = vcnl3020_read_raw,
+ .write_raw = vcnl3020_write_raw,
+ .read_avail = vcnl3020_read_avail,
+ .read_event_value = vcnl3020_read_event,
+ .write_event_value = vcnl3020_write_event,
+ .read_event_config = vcnl3020_read_event_config,
+ .write_event_config = vcnl3020_write_event_config,
+};
+
+static const struct regmap_config vcnl3020_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = VCNL_PS_MOD_ADJ,
+};
+
+static irqreturn_t vcnl3020_handle_irq_thread(int irq, void *p)
+{
+ struct iio_dev *indio_dev = p;
+ struct vcnl3020_data *data = iio_priv(indio_dev);
+ unsigned int isr;
+ int rc;
+
+ rc = regmap_read(data->regmap, VCNL_ISR, &isr);
+ if (rc) {
+ dev_err(data->dev, "Error (%d) reading reg (0x%x)\n",
+ rc, VCNL_ISR);
+ return IRQ_HANDLED;
+ }
+
+ if (!(isr & VCNL_ICR_THRES_EN))
+ return IRQ_NONE;
+
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 1,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_RISING),
+ iio_get_time_ns(indio_dev));
+
+ rc = regmap_write(data->regmap, VCNL_ISR, isr & VCNL_ICR_THRES_EN);
+ if (rc)
+ dev_err(data->dev, "Error (%d) writing in reg (0x%x)\n",
+ rc, VCNL_ISR);
+
+ return IRQ_HANDLED;
+}
+
+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->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;
+
+ if (client->irq) {
+ rc = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, vcnl3020_handle_irq_thread,
+ IRQF_ONESHOT, indio_dev->name,
+ indio_dev);
+ if (rc) {
+ dev_err(&client->dev,
+ "Error (%d) irq request failed (%u)\n", rc,
+ client->irq);
+ return rc;
+ }
+ }
+
+ 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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-13 00:39:05 +0000