This patch adds interrupt support for Liteon 501 chip.
Interrupt will be generated whenever ALS or proximity
data exceeds values given in upper and lower threshold
register settings.
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
---
drivers/iio/light/ltr501.c | 319 ++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 313 insertions(+), 6 deletions(-)
diff --git a/drivers/iio/light/ltr501.c b/drivers/iio/light/ltr501.c
index 8092604..593dbb1 100644
--- a/drivers/iio/light/ltr501.c
+++ b/drivers/iio/light/ltr501.c
@@ -9,7 +9,7 @@
*
* 7-bit I2C slave address 0x23
*
- * TODO: interrupt, threshold, measurement rate, IR LED characteristics
+ * TODO: measurement rate, IR LED characteristics
*/
#include <linux/module.h>
@@ -19,6 +19,7 @@
#include <linux/regmap.h>
#include <linux/iio/iio.h>
+#include <linux/iio/events.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/buffer.h>
@@ -35,6 +36,11 @@
#define LTR501_ALS_DATA0 0x8a /* 16-bit, little endian */
#define LTR501_ALS_PS_STATUS 0x8c
#define LTR501_PS_DATA 0x8d /* 16-bit, little endian */
+#define LTR501_INTR 0x8f /* output mode, polarity, mode */
+#define LTR501_PS_THRESH_UP 0x90 /* 11 bit, ps upper threshold */
+#define LTR501_PS_THRESH_LOW 0x92 /* 11 bit, ps lower threshold */
+#define LTR501_ALS_THRESH_UP 0x97 /* 16 bit, ALS upper threshold */
+#define LTR501_ALS_THRESH_LOW 0x99 /* 16 bit, ALS lower threshold */
#define LTR501_MAX_REG 0x9f
#define LTR501_ALS_CONTR_SW_RESET BIT(2)
@@ -43,10 +49,14 @@
#define LTR501_CONTR_ALS_GAIN_MASK BIT(3)
#define LTR501_CONTR_ACTIVE BIT(1)
+#define LTR501_STATUS_ALS_INTR BIT(3)
#define LTR501_STATUS_ALS_RDY BIT(2)
+#define LTR501_STATUS_PS_INTR BIT(1)
#define LTR501_STATUS_PS_RDY BIT(0)
#define LTR501_PS_DATA_MASK 0x7ff
+#define LTR501_PS_THRESH_MASK 0x7ff
+#define LTR501_ALS_THRESH_MASK 0xffff
#define LTR501_REGMAP_NAME "ltr501_regmap"
@@ -54,6 +64,10 @@ static const int int_time_mapping[] = {100000, 50000, 200000, 400000};
static const struct reg_field reg_field_it =
REG_FIELD(LTR501_ALS_MEAS_RATE, 3, 4);
+static const struct reg_field reg_field_als_intr =
+ REG_FIELD(LTR501_INTR, 0, 0);
+static const struct reg_field reg_field_ps_intr =
+ REG_FIELD(LTR501_INTR, 1, 1);
struct ltr501_data {
struct i2c_client *client;
@@ -61,6 +75,8 @@ struct ltr501_data {
u8 als_contr, ps_contr;
struct regmap *regmap;
struct regmap_field *reg_it;
+ struct regmap_field *reg_als_intr;
+ struct regmap_field *reg_ps_intr;
};
static int ltr501_drdy(struct ltr501_data *data, u8 drdy_mask)
@@ -161,7 +177,41 @@ static int ltr501_read_ps(struct ltr501_data *data)
return status;
}
-#define LTR501_INTENSITY_CHANNEL(_idx, _addr, _mod, _shared) { \
+static const struct iio_event_spec ltr501_als_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_event_spec ltr501_pxs_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),
+ },
+};
+
+#define LTR501_INTENSITY_CHANNEL(_idx, _addr, _mod, _shared, \
+ _evspec, _evsize) { \
.type = IIO_INTENSITY, \
.modified = 1, \
.address = (_addr), \
@@ -174,14 +224,19 @@ static int ltr501_read_ps(struct ltr501_data *data)
.realbits = 16, \
.storagebits = 16, \
.endianness = IIO_CPU, \
- } \
+ }, \
+ .event_spec = _evspec,\
+ .num_event_specs = _evsize,\
}
static const struct iio_chan_spec ltr501_channels[] = {
- LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0),
+ LTR501_INTENSITY_CHANNEL(0, LTR501_ALS_DATA0, IIO_MOD_LIGHT_BOTH, 0,
+ ltr501_als_event_spec,
+ ARRAY_SIZE(ltr501_als_event_spec)),
LTR501_INTENSITY_CHANNEL(1, LTR501_ALS_DATA1, IIO_MOD_LIGHT_IR,
BIT(IIO_CHAN_INFO_SCALE) |
- BIT(IIO_CHAN_INFO_INT_TIME)),
+ BIT(IIO_CHAN_INFO_INT_TIME),
+ NULL, 0),
{
.type = IIO_PROXIMITY,
.address = LTR501_PS_DATA,
@@ -194,6 +249,8 @@ static const struct iio_chan_spec ltr501_channels[] = {
.storagebits = 16,
.endianness = IIO_CPU,
},
+ .event_spec = ltr501_pxs_event_spec,
+ .num_event_specs = ARRAY_SIZE(ltr501_pxs_event_spec),
},
IIO_CHAN_SOFT_TIMESTAMP(3),
};
@@ -329,6 +386,185 @@ static int ltr501_write_raw(struct iio_dev *indio_dev,
return -EINVAL;
}
+static int ltr501_read_thresh(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)
+{
+ struct ltr501_data *data = iio_priv(indio_dev);
+ int ret, thresh_data;
+
+ switch (chan->type) {
+ case IIO_INTENSITY:
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ ret = regmap_bulk_read(data->regmap,
+ LTR501_ALS_THRESH_UP,
+ &thresh_data, 2);
+ if (ret < 0)
+ return ret;
+ *val = thresh_data & LTR501_ALS_THRESH_MASK;
+ return IIO_VAL_INT;
+ case IIO_EV_DIR_FALLING:
+ ret = regmap_bulk_read(data->regmap,
+ LTR501_ALS_THRESH_LOW,
+ &thresh_data, 2);
+ if (ret < 0)
+ return ret;
+ *val = thresh_data & LTR501_ALS_THRESH_MASK;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+ case IIO_PROXIMITY:
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ ret = regmap_bulk_read(data->regmap,
+ LTR501_PS_THRESH_UP,
+ &thresh_data, 2);
+ if (ret < 0)
+ return ret;
+ *val = thresh_data & LTR501_PS_THRESH_MASK;
+ return IIO_VAL_INT;
+ case IIO_EV_DIR_FALLING:
+ ret = regmap_bulk_read(data->regmap,
+ LTR501_PS_THRESH_LOW,
+ &thresh_data, 2);
+ if (ret < 0)
+ return ret;
+ *val = thresh_data & LTR501_PS_THRESH_MASK;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+
+ return -EINVAL;
+}
+
+static int ltr501_write_thresh(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)
+{
+ struct ltr501_data *data = iio_priv(indio_dev);
+ int ret;
+
+ if (val < 0)
+ return -EINVAL;
+
+ switch (chan->type) {
+ case IIO_INTENSITY:
+ if (val > LTR501_ALS_THRESH_MASK)
+ return -EINVAL;
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ mutex_lock(&data->lock_als);
+ ret = regmap_bulk_write(data->regmap,
+ LTR501_ALS_THRESH_UP,
+ &val, 2);
+ mutex_unlock(&data->lock_als);
+ return ret;
+ case IIO_EV_DIR_FALLING:
+ mutex_lock(&data->lock_als);
+ ret = regmap_bulk_write(data->regmap,
+ LTR501_ALS_THRESH_LOW,
+ &val, 2);
+ mutex_unlock(&data->lock_als);
+ return ret;
+ default:
+ return -EINVAL;
+ }
+ case IIO_PROXIMITY:
+ switch (dir) {
+ if (val > LTR501_PS_THRESH_MASK)
+ return -EINVAL;
+ case IIO_EV_DIR_RISING:
+ mutex_lock(&data->lock_ps);
+ ret = regmap_bulk_write(data->regmap,
+ LTR501_PS_THRESH_UP,
+ &val, 2);
+ mutex_unlock(&data->lock_ps);
+ return ret;
+ case IIO_EV_DIR_FALLING:
+ mutex_lock(&data->lock_ps);
+ ret = regmap_bulk_write(data->regmap,
+ LTR501_PS_THRESH_LOW,
+ &val, 2);
+ mutex_unlock(&data->lock_ps);
+ return ret;
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+
+ return -EINVAL;
+}
+
+static int ltr501_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 ltr501_data *data = iio_priv(indio_dev);
+ int ret, status;
+
+ switch (chan->type) {
+ case IIO_INTENSITY:
+ ret = regmap_field_read(data->reg_als_intr, &status);
+ if (ret < 0)
+ return ret;
+ return status;
+ case IIO_PROXIMITY:
+ ret = regmap_field_read(data->reg_ps_intr, &status);
+ if (ret < 0)
+ return ret;
+ return status;
+ default:
+ return -EINVAL;
+ }
+
+ return -EINVAL;
+}
+
+static int ltr501_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)
+{
+ struct ltr501_data *data = iio_priv(indio_dev);
+ int ret;
+
+ /* only 1 and 0 are valid inputs */
+ if (state != 1 || state != 0)
+ return -EINVAL;
+
+ switch (chan->type) {
+ case IIO_INTENSITY:
+ mutex_lock(&data->lock_als);
+ ret = regmap_field_write(data->reg_als_intr, state);
+ mutex_unlock(&data->lock_als);
+ return ret;
+ case IIO_PROXIMITY:
+ mutex_lock(&data->lock_ps);
+ ret = regmap_field_write(data->reg_ps_intr, state);
+ mutex_unlock(&data->lock_ps);
+ return ret;
+ default:
+ return -EINVAL;
+ }
+
+ return -EINVAL;
+}
+
static IIO_CONST_ATTR(in_proximity_scale_available, "1 0.25 0.125 0.0625");
static IIO_CONST_ATTR(in_intensity_scale_available, "1 0.005");
static IIO_CONST_ATTR_INT_TIME_AVAIL("0.05 0.1 0.2 0.4");
@@ -344,10 +580,21 @@ static const struct attribute_group ltr501_attribute_group = {
.attrs = ltr501_attributes,
};
+static const struct iio_info ltr501_info_no_irq = {
+ .read_raw = ltr501_read_raw,
+ .write_raw = ltr501_write_raw,
+ .attrs = <r501_attribute_group,
+ .driver_module = THIS_MODULE,
+};
+
static const struct iio_info ltr501_info = {
.read_raw = ltr501_read_raw,
.write_raw = ltr501_write_raw,
.attrs = <r501_attribute_group,
+ .read_event_value = <r501_read_thresh,
+ .write_event_value = <r501_write_thresh,
+ .read_event_config = <r501_read_event_config,
+ .write_event_config = <r501_write_event_config,
.driver_module = THIS_MODULE,
};
@@ -413,6 +660,36 @@ done:
return IRQ_HANDLED;
}
+static irqreturn_t ltr501_interrupt_handler(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct ltr501_data *data = iio_priv(indio_dev);
+ int ret, status;
+
+ ret = regmap_read(data->regmap, LTR501_ALS_PS_STATUS, &status);
+ if (ret < 0) {
+ dev_err(&data->client->dev,
+ "irq read int reg failed\n");
+ return IRQ_HANDLED;
+ }
+
+ if (status & LTR501_STATUS_ALS_INTR)
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_EITHER),
+ iio_get_time_ns());
+
+ if (status & LTR501_STATUS_PS_INTR)
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_EITHER),
+ iio_get_time_ns());
+
+ return IRQ_HANDLED;
+}
+
static int ltr501_init(struct ltr501_data *data)
{
int ret, status;
@@ -492,6 +769,20 @@ static int ltr501_probe(struct i2c_client *client,
return PTR_ERR(data->reg_it);
}
+ data->reg_als_intr = devm_regmap_field_alloc(&client->dev, regmap,
+ reg_field_als_intr);
+ if (IS_ERR(data->reg_als_intr)) {
+ dev_err(&client->dev, "ALS intr mode reg field init failed\n");
+ return PTR_ERR(data->reg_als_intr);
+ }
+
+ data->reg_ps_intr = devm_regmap_field_alloc(&client->dev, regmap,
+ reg_field_ps_intr);
+ if (IS_ERR(data->reg_ps_intr)) {
+ dev_err(&client->dev, "PS intr mode reg field init failed.\n");
+ return PTR_ERR(data->reg_ps_intr);
+ }
+
ret = regmap_read(data->regmap, LTR501_PART_ID, &partid);
if (ret < 0)
return ret;
@@ -499,7 +790,6 @@ static int ltr501_probe(struct i2c_client *client,
return -ENODEV;
indio_dev->dev.parent = &client->dev;
- indio_dev->info = <r501_info;
indio_dev->channels = ltr501_channels;
indio_dev->num_channels = ARRAY_SIZE(ltr501_channels);
indio_dev->name = LTR501_DRV_NAME;
@@ -509,6 +799,23 @@ static int ltr501_probe(struct i2c_client *client,
if (ret < 0)
return ret;
+ if (client->irq > 0) {
+ indio_dev->info = <r501_info;
+ ret = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, ltr501_interrupt_handler,
+ IRQF_TRIGGER_FALLING |
+ IRQF_ONESHOT,
+ "ltr501_thresh_event",
+ indio_dev);
+ if (ret) {
+ dev_err(&client->dev, "request irq (%d) failed\n",
+ client->irq);
+ return ret;
+ }
+ } else {
+ indio_dev->info = <r501_info_no_irq;
+ }
+
ret = iio_triggered_buffer_setup(indio_dev, NULL,
ltr501_trigger_handler, NULL);
if (ret)
--
1.9.1
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