Add support to configure ambient light sensor interrupts and threshold
limits for vcnl4040 and vcnl4200. If an interrupt is detected an event
will be pushed to the event interface.
Signed-off-by: Astrid Rost <astrid.rost@xxxxxxxx>
---
drivers/iio/light/vcnl4000.c | 94 +++++++++++++++++++++++++++++++++++-
1 file changed, 92 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
index 0a96e9451ec7..0f4c39adc68a 100644
--- a/drivers/iio/light/vcnl4000.c
+++ b/drivers/iio/light/vcnl4000.c
@@ -62,6 +62,8 @@
#define VCNL4200_PS_CONF1 0x03 /* Proximity configuration */
#define VCNL4040_PS_THDL_LM 0x06 /* Proximity threshold low */
#define VCNL4040_PS_THDH_LM 0x07 /* Proximity threshold high */
+#define VCNL4040_ALS_THDL_LM 0x02 /* Ambient light threshold low */
+#define VCNL4040_ALS_THDH_LM 0x01 /* Ambient light threshold high */
#define VCNL4200_PS_DATA 0x08 /* Proximity data */
#define VCNL4200_AL_DATA 0x09 /* Ambient light data */
#define VCNL4040_INT_FLAGS 0x0b /* Interrupt register */
@@ -81,11 +83,14 @@
#define VCNL4040_ALS_CONF_ALS_SHUTDOWN BIT(0)
#define VCNL4040_ALS_CONF_IT GENMASK(7, 6) /* Ambient integration time */
+#define VCNL4040_ALS_CONF_INT_EN BIT(1) /* Ambient light Interrupt enable */
#define VCNL4040_PS_CONF1_PS_SHUTDOWN BIT(0)
#define VCNL4040_PS_CONF2_PS_IT GENMASK(3, 1) /* Proximity integration time */
#define VCNL4040_PS_CONF2_PS_INT GENMASK(9, 8) /* Proximity interrupt mode */
#define VCNL4040_PS_IF_AWAY BIT(8) /* Proximity event cross low threshold */
#define VCNL4040_PS_IF_CLOSE BIT(9) /* Proximity event cross high threshold */
+#define VCNL4040_ALS_RISING BIT(12) /* Ambient Light cross high threshold */
+#define VCNL4040_ALS_FALLING BIT(13) /* Ambient Light cross low threshold */
/* Bit masks for interrupt registers. */
#define VCNL4010_INT_THR_SEL BIT(0) /* Select threshold interrupt source */
@@ -170,6 +175,7 @@ struct vcnl4000_data {
int rev;
int al_scale;
u8 ps_int; /* proximity interrupt mode */
+ u8 als_int; /* ambient light interrupt mode*/
const struct vcnl4000_chip_spec *chip_spec;
struct mutex vcnl4000_lock;
struct vcnl4200_channel vcnl4200_al;
@@ -295,7 +301,7 @@ static int vcnl4200_set_power_state(struct vcnl4000_data *data, bool on)
int ret;
/* Do not power down if interrupts are enabled */
- if (!on && data->ps_int)
+ if (!on && (data->ps_int || data->als_int))
return 0;
ret = vcnl4000_write_als_enable(data, on);
@@ -340,6 +346,7 @@ static int vcnl4200_init(struct vcnl4000_data *data)
data->rev = (ret >> 8) & 0xf;
data->ps_int = 0;
+ data->als_int = 0;
data->vcnl4200_al.reg = VCNL4200_AL_DATA;
data->vcnl4200_ps.reg = VCNL4200_PS_DATA;
@@ -930,6 +937,26 @@ static int vcnl4040_read_event(struct iio_dev *indio_dev,
struct vcnl4000_data *data = iio_priv(indio_dev);
switch (chan->type) {
+ case IIO_LIGHT:
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ ret = i2c_smbus_read_word_data(data->client,
+ VCNL4040_ALS_THDH_LM);
+ break;
+ case IIO_EV_DIR_FALLING:
+ ret = i2c_smbus_read_word_data(data->client,
+ VCNL4040_ALS_THDL_LM);
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
case IIO_PROXIMITY:
switch (info) {
case IIO_EV_INFO_VALUE:
@@ -970,6 +997,28 @@ static int vcnl4040_write_event(struct iio_dev *indio_dev,
struct vcnl4000_data *data = iio_priv(indio_dev);
switch (chan->type) {
+ case IIO_LIGHT:
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ ret = i2c_smbus_write_word_data(data->client,
+ VCNL4040_ALS_THDH_LM,
+ val);
+ break;
+ case IIO_EV_DIR_FALLING:
+ ret = i2c_smbus_write_word_data(data->client,
+ VCNL4040_ALS_THDL_LM,
+ val);
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
case IIO_PROXIMITY:
switch (info) {
case IIO_EV_INFO_VALUE:
@@ -1091,6 +1140,14 @@ static int vcnl4040_read_event_config(struct iio_dev *indio_dev,
struct vcnl4000_data *data = iio_priv(indio_dev);
switch (chan->type) {
+ case IIO_LIGHT:
+ ret = i2c_smbus_read_word_data(data->client, VCNL4200_AL_CONF);
+ if (ret < 0)
+ return ret;
+
+ data->als_int = FIELD_GET(VCNL4040_ALS_CONF_INT_EN, ret);
+
+ return data->als_int;
case IIO_PROXIMITY:
ret = i2c_smbus_read_word_data(data->client, VCNL4200_PS_CONF1);
if (ret < 0)
@@ -1118,6 +1175,21 @@ static int vcnl4040_write_event_config(struct iio_dev *indio_dev,
mutex_lock(&data->vcnl4000_lock);
switch (chan->type) {
+ case IIO_LIGHT:
+ ret = i2c_smbus_read_word_data(data->client, VCNL4200_AL_CONF);
+ if (ret < 0)
+ goto out;
+
+ mask = VCNL4040_ALS_CONF_INT_EN;
+ if (state)
+ val = (ret | mask);
+ else
+ val = (ret & ~mask);
+
+ data->als_int = FIELD_GET(VCNL4040_ALS_CONF_INT_EN, val);
+ ret = i2c_smbus_write_word_data(data->client, VCNL4200_AL_CONF,
+ val);
+ break;
case IIO_PROXIMITY:
ret = i2c_smbus_read_word_data(data->client, VCNL4200_PS_CONF1);
if (ret < 0)
@@ -1140,7 +1212,7 @@ static int vcnl4040_write_event_config(struct iio_dev *indio_dev,
out:
mutex_unlock(&data->vcnl4000_lock);
- data->chip_spec->set_power_state(data, data->ps_int != 0);
+ data->chip_spec->set_power_state(data, data->ps_int || data->als_int);
return ret;
}
@@ -1171,6 +1243,22 @@ static irqreturn_t vcnl4040_irq_thread(int irq, void *p)
iio_get_time_ns(indio_dev));
}
+ if (ret & VCNL4040_ALS_FALLING) {
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_FALLING),
+ iio_get_time_ns(indio_dev));
+ }
+
+ if (ret & VCNL4040_ALS_RISING) {
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_RISING),
+ iio_get_time_ns(indio_dev));
+ }
+
return IRQ_HANDLED;
}
@@ -1393,6 +1481,8 @@ static const struct iio_chan_spec vcnl4040_channels[] = {
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_INT_TIME),
.info_mask_separate_available = BIT(IIO_CHAN_INFO_INT_TIME),
+ .event_spec = vcnl4000_event_spec,
+ .num_event_specs = ARRAY_SIZE(vcnl4000_event_spec),
}, {
.type = IIO_PROXIMITY,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
--
2.30.2
