Added rate control support for ALS and proximity
threshold interrupts.
Setting <n> to ALS intr_persist sysfs node would
generate interrupt whenever ALS data cross either
upper or lower threshold limits <n> number of times.
Similarly setting <m> to proximity intr_persist sysfs
node would genere interrupt whenever proximity data falls
outside threshold limit <m> number of times.
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
---
drivers/iio/light/ltr501.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 85 insertions(+)
diff --git a/drivers/iio/light/ltr501.c b/drivers/iio/light/ltr501.c
index 16c3f7a..e8f5019 100644
--- a/drivers/iio/light/ltr501.c
+++ b/drivers/iio/light/ltr501.c
@@ -39,6 +39,7 @@
#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_INTR_PRST 0x9e /* ps thresh, als thresh */
#define LTR501_ALS_CONTR_SW_RESET BIT(2)
#define LTR501_CONTR_PS_GAIN_MASK (BIT(3) | BIT(2))
@@ -65,6 +66,9 @@
#define LTR501_INTR_MODE_ALS BIT(1)
#define LTR501_INTR_MODE_ALS_PS 3
+#define LTR501_INTR_PRST_ALS_MASK 0x0f
+#define LTR501_INTR_PRST_PS_MASK 0xf0
+
#define LTR501_PS_DATA_MASK 0x7ff
#define LTR501_PS_THRESH_MASK 0x7ff
#define LTR501_ALS_THRESH_MASK 0xffff
@@ -126,6 +130,75 @@ static int ltr501_read_ps(struct ltr501_data *data)
return i2c_smbus_read_word_data(data->client, LTR501_PS_DATA);
}
+static ssize_t ltr501_read_intr_prst(struct iio_dev *indio_dev,
+ uintptr_t private,
+ const struct iio_chan_spec *chan,
+ char *buf)
+{
+ struct ltr501_data *data = iio_priv(indio_dev);
+ int ret = -EINVAL;
+
+ switch (chan->type) {
+ case IIO_INTENSITY:
+ mutex_lock(&data->lock_als);
+ ret = i2c_smbus_read_byte_data(data->client, LTR501_INTR_PRST);
+ mutex_unlock(&data->lock_als);
+ return ret < 0 ? ret : sprintf(buf, "%u\n",
+ ret & LTR501_INTR_PRST_ALS_MASK);
+ case IIO_PROXIMITY:
+ mutex_lock(&data->lock_ps);
+ ret = i2c_smbus_read_byte_data(data->client, LTR501_INTR_PRST);
+ mutex_unlock(&data->lock_ps);
+ return ret < 0 ? ret : sprintf(buf, "%u\n",
+ (ret & LTR501_INTR_PRST_PS_MASK) >> 4);
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static ssize_t ltr501_write_intr_prst(struct iio_dev *indio_dev,
+ uintptr_t private,
+ const struct iio_chan_spec *chan,
+ const char *buf, size_t len)
+{
+ struct ltr501_data *data = iio_priv(indio_dev);
+ int ret = -EINVAL;
+ u8 new_val;
+
+ ret = kstrtou8(buf, 10, &new_val);
+ if (ret)
+ return ret;
+
+ ret = i2c_smbus_read_byte_data(data->client, LTR501_INTR_PRST);
+ if (ret < 0)
+ return ret;
+
+ switch (chan->type) {
+ case IIO_INTENSITY:
+ mutex_lock(&data->lock_als);
+ new_val = (ret & ~LTR501_INTR_PRST_ALS_MASK) |
+ (new_val & LTR501_INTR_PRST_ALS_MASK);
+ ret = i2c_smbus_write_byte_data(data->client,
+ LTR501_INTR_PRST, new_val);
+ mutex_unlock(&data->lock_als);
+ break;
+ case IIO_PROXIMITY:
+ mutex_lock(&data->lock_ps);
+ new_val = (ret & ~LTR501_INTR_PRST_PS_MASK) |
+ ((new_val << 4) & LTR501_INTR_PRST_PS_MASK);
+ ret = i2c_smbus_write_byte_data(data->client,
+ LTR501_INTR_PRST, new_val);
+ mutex_unlock(&data->lock_ps);
+ break;
+ default:
+ break;
+ }
+
+ return ret < 0 ? ret : len;
+}
+
static const struct iio_event_spec ltr501_als_event_spec[] = {
{
.type = IIO_EV_TYPE_THRESH,
@@ -163,6 +236,16 @@ static const struct iio_event_spec ltr501_pxs_event_spec[] = {
},
};
+static const struct iio_chan_spec_ext_info ltr501_ext_info[] = {
+ {
+ .name = "intr_persist",
+ .read = ltr501_read_intr_prst,
+ .write = ltr501_write_intr_prst,
+ .shared = IIO_SHARED_BY_TYPE,
+ },
+ {},
+};
+
#define LTR501_INTENSITY_CHANNEL(_idx, _addr, _mod, _shared) { \
.type = IIO_INTENSITY, \
.modified = 1, \
@@ -179,6 +262,7 @@ static const struct iio_event_spec ltr501_pxs_event_spec[] = {
}, \
.event_spec = ltr501_als_event_spec,\
.num_event_specs = ARRAY_SIZE(ltr501_als_event_spec),\
+ .ext_info = ltr501_ext_info,\
}
static const struct iio_chan_spec ltr501_channels[] = {
@@ -199,6 +283,7 @@ static const struct iio_chan_spec ltr501_channels[] = {
},
.event_spec = ltr501_pxs_event_spec,
.num_event_specs = ARRAY_SIZE(ltr501_pxs_event_spec),
+ .ext_info = ltr501_ext_info,
},
IIO_CHAN_SOFT_TIMESTAMP(3),
};
--
1.9.1
--
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