iio: hid-sensor-press: Add timestamp channel

Each sample has a timestamp field with this change. This timestamp may
be from the sensor hub when present or local kernel timestamp. The
unit of timestamp is nanosecond.

Signed-off-by: Ye Xiang <xiang.ye@intel.com>
Link: https://lore.kernel.org/r/20210731032556.26813-1-xiang.ye@intel.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/pressure/hid-sensor-press.c b/drivers/iio/pressure/hid-sensor-press.c
index dcd593c..a9215eb 100644 (file)
--- a/drivers/iio/pressure/hid-sensor-press.c
+++ b/drivers/iio/pressure/hid-sensor-press.c
@@ -13,17 +13,24 @@
 #include <linux/iio/buffer.h>
 #include "../common/hid-sensors/hid-sensor-trigger.h"
 
-#define CHANNEL_SCAN_INDEX_PRESSURE 0
+enum {
+       CHANNEL_SCAN_INDEX_PRESSURE,
+       CHANNEL_SCAN_INDEX_TIMESTAMP,
+};
 
 struct press_state {
        struct hid_sensor_hub_callbacks callbacks;
        struct hid_sensor_common common_attributes;
        struct hid_sensor_hub_attribute_info press_attr;
-       u32 press_data;
+       struct {
+               u32 press_data;
+               u64 timestamp __aligned(8);
+       } scan;
        int scale_pre_decml;
        int scale_post_decml;
        int scale_precision;
        int value_offset;
+       s64 timestamp;
 };
 
 static const u32 press_sensitivity_addresses[] = {
@@ -41,7 +48,9 @@ static const struct iio_chan_spec press_channels[] = {
                BIT(IIO_CHAN_INFO_SAMP_FREQ) |
                BIT(IIO_CHAN_INFO_HYSTERESIS),
                .scan_index = CHANNEL_SCAN_INDEX_PRESSURE,
-       }
+       },
+       IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP)
+
 };
 
 /* Adjust channel real bits based on report descriptor */
@@ -154,14 +163,6 @@ static const struct iio_info press_info = {
        .write_raw = &press_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 press_proc_event(struct hid_sensor_hub_device *hsdev,
                                unsigned usage_id,
@@ -171,10 +172,13 @@ static int press_proc_event(struct hid_sensor_hub_device *hsdev,
        struct press_state *press_state = iio_priv(indio_dev);
 
        dev_dbg(&indio_dev->dev, "press_proc_event\n");
-       if (atomic_read(&press_state->common_attributes.data_ready))
-               hid_sensor_push_data(indio_dev,
-                               &press_state->press_data,
-                               sizeof(press_state->press_data));
+       if (atomic_read(&press_state->common_attributes.data_ready)) {
+               if (!press_state->timestamp)
+                       press_state->timestamp = iio_get_time_ns(indio_dev);
+
+               iio_push_to_buffers_with_timestamp(
+                       indio_dev, &press_state->scan, press_state->timestamp);
+       }
 
        return 0;
 }
@@ -191,9 +195,13 @@ static int press_capture_sample(struct hid_sensor_hub_device *hsdev,
 
        switch (usage_id) {
        case HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE:
-               press_state->press_data = *(u32 *)raw_data;
+               press_state->scan.press_data = *(u32 *)raw_data;
                ret = 0;
                break;
+       case HID_USAGE_SENSOR_TIME_TIMESTAMP:
+               press_state->timestamp = hid_sensor_convert_timestamp(
+                       &press_state->common_attributes, *(s64 *)raw_data);
+               break;
        default:
                break;
        }