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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.c451
1 files changed, 432 insertions, 19 deletions
diff --git a/drivers/iio/proximity/vcnl3020.c b/drivers/iio/proximity/vcnl3020.c
index 9ff1a164c2e6..7f417372566a 100644
--- a/drivers/iio/proximity/vcnl3020.c
+++ b/drivers/iio/proximity/vcnl3020.c
@@ -2,8 +2,6 @@
/*
* Support for Vishay VCNL3020 proximity sensor on i2c bus.
* Based on Vishay VCNL4000 driver code.
- *
- * TODO: interrupts.
*/
#include <linux/module.h>
@@ -11,9 +9,10 @@
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/regmap.h>
+#include <linux/interrupt.h>
#include <linux/iio/iio.h>
-#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
#define VCNL3020_PROD_ID 0x21
@@ -37,21 +36,49 @@
* 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;
};
/**
@@ -75,29 +102,29 @@ static u32 microamp_to_reg(u32 *val)
return *val /= 10000;
};
-static struct vcnl3020_property vcnl3020_led_current_property = {
+static const 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)
+ const struct vcnl3020_property *prop)
{
int rc;
u32 val;
- rc = device_property_read_u32(data->dev, prop.name, &val);
+ rc = device_property_read_u32(data->dev, prop->name, &val);
if (rc)
return 0;
- if (prop.conversion_func)
- prop.conversion_func(&val);
+ if (prop->conversion_func)
+ prop->conversion_func(&val);
- rc = regmap_write(data->regmap, prop.reg, val);
+ rc = regmap_write(data->regmap, prop->reg, val);
if (rc) {
dev_err(data->dev, "Error (%d) setting property (%s)\n",
- rc, prop.name);
+ rc, prop->name);
}
return rc;
@@ -126,17 +153,37 @@ static int vcnl3020_init(struct vcnl3020_data *data)
mutex_init(&data->lock);
return vcnl3020_get_and_apply_property(data,
- vcnl3020_led_current_property);
+ &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;
- __be16 res;
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;
@@ -152,12 +199,232 @@ static int vcnl3020_measure_proximity(struct vcnl3020_data *data, int *val)
}
/* high & low result bytes read */
- rc = regmap_bulk_read(data->regmap, VCNL_PS_RESULT_HI, &res,
- sizeof(res));
+ 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;
+ }
- *val = be16_to_cpu(res);
+ 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);
@@ -165,10 +432,72 @@ err_unlock:
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,
+ bool 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),
+ .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),
},
};
@@ -185,6 +514,41 @@ static int vcnl3020_read_raw(struct iio_dev *indio_dev,
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;
}
@@ -192,6 +556,12 @@ static int vcnl3020_read_raw(struct iio_dev *indio_dev,
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 = {
@@ -200,6 +570,37 @@ static const struct regmap_config vcnl3020_regmap_config = {
.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;
@@ -226,13 +627,25 @@ static int vcnl3020_probe(struct i2c_client *client)
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;
+ 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);
}
@@ -240,7 +653,7 @@ static const struct of_device_id vcnl3020_of_match[] = {
{
.compatible = "vishay,vcnl3020",
},
- {}
+ { }
};
MODULE_DEVICE_TABLE(of, vcnl3020_of_match);
@@ -249,7 +662,7 @@ static struct i2c_driver vcnl3020_driver = {
.name = "vcnl3020",
.of_match_table = vcnl3020_of_match,
},
- .probe_new = vcnl3020_probe,
+ .probe = vcnl3020_probe,
};
module_i2c_driver(vcnl3020_driver);
generated by cgit (git 2.34.1) at 2025-12-26 12:15:55 +0000