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Subject[PATCH 3/6] iio: hid-sensor-als: Add timestamp channel
Date
Each sample has a timestamp field with this change. This timestamp may
be from the sensor hub when present or local kernel timestamp. And the
unit of timestamp is nanosecond.

Signed-off-by: Ye Xiang <xiang.ye@intel.com>
---
drivers/iio/light/hid-sensor-als.c | 39 ++++++++++++++++++------------
1 file changed, 23 insertions(+), 16 deletions(-)

diff --git a/drivers/iio/light/hid-sensor-als.c b/drivers/iio/light/hid-sensor-als.c
index 5460a744dbd0..afcdb424bfb8 100644
--- a/drivers/iio/light/hid-sensor-als.c
+++ b/drivers/iio/light/hid-sensor-als.c
@@ -22,15 +22,21 @@ enum {
CHANNEL_SCAN_INDEX_MAX
};

+#define CHANNEL_SCAN_INDEX_TIMESTAMP CHANNEL_SCAN_INDEX_MAX
+
struct als_state {
struct hid_sensor_hub_callbacks callbacks;
struct hid_sensor_common common_attributes;
struct hid_sensor_hub_attribute_info als_illum;
- u32 illum[CHANNEL_SCAN_INDEX_MAX];
+ struct {
+ u32 illum[CHANNEL_SCAN_INDEX_MAX];
+ u64 timestamp __aligned(8);
+ } scan;
int scale_pre_decml;
int scale_post_decml;
int scale_precision;
int value_offset;
+ s64 timestamp;
};

static const u32 als_sensitivity_addresses[] = {
@@ -59,7 +65,8 @@ static const struct iio_chan_spec als_channels[] = {
BIT(IIO_CHAN_INFO_SAMP_FREQ) |
BIT(IIO_CHAN_INFO_HYSTERESIS),
.scan_index = CHANNEL_SCAN_INDEX_ILLUM,
- }
+ },
+ IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP)
};

/* Adjust channel real bits based on report descriptor */
@@ -173,14 +180,6 @@ static const struct iio_info als_info = {
.write_raw = &als_write_raw,
};

-/* Function to push data to buffer */
-static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
- int len)
-{
- dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
- iio_push_to_buffers(indio_dev, data);
-}
-
/* Callback handler to send event after all samples are received and captured */
static int als_proc_event(struct hid_sensor_hub_device *hsdev,
unsigned usage_id,
@@ -190,10 +189,14 @@ static int als_proc_event(struct hid_sensor_hub_device *hsdev,
struct als_state *als_state = iio_priv(indio_dev);

dev_dbg(&indio_dev->dev, "als_proc_event\n");
- if (atomic_read(&als_state->common_attributes.data_ready))
- hid_sensor_push_data(indio_dev,
- &als_state->illum,
- sizeof(als_state->illum));
+ if (atomic_read(&als_state->common_attributes.data_ready)) {
+ if (!als_state->timestamp)
+ als_state->timestamp = iio_get_time_ns(indio_dev);
+
+ iio_push_to_buffers_with_timestamp(indio_dev, &als_state->scan,
+ als_state->timestamp);
+ als_state->timestamp = 0;
+ }

return 0;
}
@@ -211,10 +214,14 @@ static int als_capture_sample(struct hid_sensor_hub_device *hsdev,

switch (usage_id) {
case HID_USAGE_SENSOR_LIGHT_ILLUM:
- als_state->illum[CHANNEL_SCAN_INDEX_INTENSITY] = sample_data;
- als_state->illum[CHANNEL_SCAN_INDEX_ILLUM] = sample_data;
+ als_state->scan.illum[CHANNEL_SCAN_INDEX_INTENSITY] = sample_data;
+ als_state->scan.illum[CHANNEL_SCAN_INDEX_ILLUM] = sample_data;
ret = 0;
break;
+ case HID_USAGE_SENSOR_TIME_TIMESTAMP:
+ als_state->timestamp = hid_sensor_convert_timestamp(&als_state->common_attributes,
+ *(s64 *)raw_data);
+ break;
default:
break;
}
--
2.17.1
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