HID: sony: Report hardware timestamp for DS4 sensor values

Report the hardware timestamp inside each HID report through
MSC_TIMESTAMP for motion sensor values.

Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c
index fedaebe0363f..dab4aefd841e 100644
--- a/drivers/hid/hid-sony.c
+++ b/drivers/hid/hid-sony.c
@@ -781,6 +781,7 @@ struct motion_output_report_02 {
  * additional +2.
  */
 #define DS4_INPUT_REPORT_BUTTON_OFFSET    5
+#define DS4_INPUT_REPORT_TIMESTAMP_OFFSET 10
 #define DS4_INPUT_REPORT_GYRO_X_OFFSET   13
 #define DS4_INPUT_REPORT_BATTERY_OFFSET  30
 #define DS4_INPUT_REPORT_TOUCHPAD_OFFSET 33
@@ -837,6 +838,11 @@ struct sony_sc {
         u8 led_delay_on[MAX_LEDS];
         u8 led_delay_off[MAX_LEDS];
         u8 led_count;
+
+        bool timestamp_initialized;
+        u16 prev_timestamp;
+        unsigned int timestamp_us;
+
         bool ds4_dongle_connected;
         /* DS4 calibration data */
         struct ds4_calibration_data ds4_calib_data[6];
@@ -1031,6 +1037,7 @@ static void dualshock4_parse_report(struct sony_sc *sc, u8 *rd, int size)
         unsigned long flags;
         int n, m, offset, num_touch_data, max_touch_data;
         u8 cable_state, battery_capacity, battery_charging;
+        u16 timestamp;
 
         /* When using Bluetooth the header is 2 bytes longer, so skip these. */
         int data_offset = (sc->quirks & DUALSHOCK4_CONTROLLER_USB) ? 0 : 2;
@@ -1039,6 +1046,24 @@ static void dualshock4_parse_report(struct sony_sc *sc, u8 *rd, int size)
         offset = data_offset + DS4_INPUT_REPORT_BUTTON_OFFSET;
         input_report_key(sc->touchpad, BTN_LEFT, rd[offset+2] & 0x2);
 
+        /* Convert timestamp (in 5.33us unit) to timestamp_us */
+        offset = data_offset + DS4_INPUT_REPORT_TIMESTAMP_OFFSET;
+        timestamp = get_unaligned_le16(&rd[offset]);
+        if (!sc->timestamp_initialized) {
+                sc->timestamp_us = ((unsigned int)timestamp * 16) / 3;
+                sc->timestamp_initialized = true;
+        } else {
+                u16 delta;
+
+                if (sc->prev_timestamp > timestamp)
+                        delta = (U16_MAX - sc->prev_timestamp + timestamp + 1);
+                else
+                        delta = timestamp - sc->prev_timestamp;
+                sc->timestamp_us += (delta * 16) / 3;
+        }
+        sc->prev_timestamp = timestamp;
+        input_event(sc->sensor_dev, EV_MSC, MSC_TIMESTAMP, sc->timestamp_us);
+
         offset = data_offset + DS4_INPUT_REPORT_GYRO_X_OFFSET;
         for (n = 0; n < 6; n++) {
                 /* Store data in int for more precision during mult_frac. */
@@ -1385,6 +1410,8 @@ static int sony_register_sensors(struct sony_sc *sc)
         input_abs_set_res(sc->sensor_dev, ABS_RY, DS4_GYRO_RES_PER_DEG_S);
         input_abs_set_res(sc->sensor_dev, ABS_RZ, DS4_GYRO_RES_PER_DEG_S);
 
+        __set_bit(EV_MSC, sc->sensor_dev->evbit);
+        __set_bit(MSC_TIMESTAMP, sc->sensor_dev->mscbit);
         __set_bit(INPUT_PROP_ACCELEROMETER, sc->sensor_dev->propbit);
 
         ret = input_register_device(sc->sensor_dev);