iio: hid-sensor-hub: Implement batch mode
HID sensor hubs using Integrated Senor Hub (ISH) has added capability to
support batch mode. This allows host processor to go to sleep for extended
duration, while the sensor hub is storing samples in its internal buffers.
'Commit f4f4673b7535 ("iio: add support for hardware fifo")' implements
feature in IIO core to implement such feature. This feature is used in
bmc150-accel-core.c to implement batch mode. This implementation allows
software device buffer watermark to be used as a hint to adjust hardware
FIFO.
But HID sensor hubs don't allow to change internal buffer size of FIFOs.
Instead an additional usage id to set "maximum report latency" is defined.
This allows host to go to sleep upto this latency period without getting
any report. Since there is no ABI to set this latency, a new attribute
"hwfifo_timeout" is added so that user mode can specify a latency.
This change checks presence of usage id to get/set maximum report latency
and if present, it will expose hwfifo_timeout.
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-sensor-hub.h
index f32d7c3..fc7aae6 100644
--- a/include/linux/hid-sensor-hub.h
+++ b/include/linux/hid-sensor-hub.h
@@ -233,12 +233,14 @@
atomic_t user_requested_state;
int poll_interval;
int raw_hystersis;
+ int latency_ms;
struct iio_trigger *trigger;
int timestamp_ns_scale;
struct hid_sensor_hub_attribute_info poll;
struct hid_sensor_hub_attribute_info report_state;
struct hid_sensor_hub_attribute_info power_state;
struct hid_sensor_hub_attribute_info sensitivity;
+ struct hid_sensor_hub_attribute_info report_latency;
struct work_struct work;
};
@@ -276,5 +278,8 @@
int64_t hid_sensor_convert_timestamp(struct hid_sensor_common *st,
int64_t raw_value);
+bool hid_sensor_batch_mode_supported(struct hid_sensor_common *st);
+int hid_sensor_set_report_latency(struct hid_sensor_common *st, int latency);
+int hid_sensor_get_report_latency(struct hid_sensor_common *st);
#endif