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Commit bc2b7dab authored by Gregor Boirie's avatar Gregor Boirie Committed by Jonathan Cameron
Browse files

iio:core: timestamping clock selection support 



Adds a new per-device sysfs attribute "current_timestamp_clock" to allow
userspace to select a particular POSIX clock for buffered samples and
events timestamping.

Following clocks, as listed in clock_gettime(2), are supported:
CLOCK_REALTIME, CLOCK_MONOTONIC, CLOCK_MONOTONIC_RAW,
CLOCK_REALTIME_COARSE, CLOCK_MONOTONIC_COARSE, CLOCK_BOOTTIME and
CLOCK_TAI.

Signed-off-by: default avatarGregor Boirie <gregor.boirie@parrot.com>
Acked-by: default avatarSanchayan Maity <maitysanchayan@gmail.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent eaaa7ec7

Documentation/ABI/testing/sysfs-bus-iio

+7 −0
Original line number Diff line number Diff line
@@ -32,6 +32,13 @@ Description: 
		Description of the physical chip / device for device X.

		Typically a part number.



What:		/sys/bus/iio/devices/iio:deviceX/timestamp_clock

KernelVersion:	4.5

Contact:	linux-iio@vger.kernel.org

Description:

		String identifying current posix clock used to timestamp

		buffered samples and events for device X.



What:		/sys/bus/iio/devices/iio:deviceX/sampling_frequency

What:		/sys/bus/iio/devices/iio:deviceX/buffer/sampling_frequency

What:		/sys/bus/iio/devices/triggerX/sampling_frequency

Documentation/DocBook/iio.tmpl

+1 −1
Original line number Diff line number Diff line
@@ -594,7 +594,7 @@ 


    irqreturn_t sensor_iio_pollfunc(int irq, void *p)

    {

        pf->timestamp = iio_get_time_ns();

        pf->timestamp = iio_get_time_ns((struct indio_dev *)p);

        return IRQ_WAKE_THREAD;

    }

drivers/iio/accel/bma180.c

+1 −1
Original line number Diff line number Diff line
@@ -654,7 +654,7 @@ static irqreturn_t bma180_trigger_handler(int irq, void *p) 
	struct iio_poll_func *pf = p;

	struct iio_dev *indio_dev = pf->indio_dev;

	struct bma180_data *data = iio_priv(indio_dev);

	int64_t time_ns = iio_get_time_ns();

	s64 time_ns = iio_get_time_ns(indio_dev);

	int bit, ret, i = 0;



	mutex_lock(&data->mutex);

drivers/iio/accel/bmc150-accel-core.c

+2 −2
Original line number Diff line number Diff line
@@ -901,7 +901,7 @@ static int __bmc150_accel_fifo_flush(struct iio_dev *indio_dev, 
	 */

	if (!irq) {

		data->old_timestamp = data->timestamp;

		data->timestamp = iio_get_time_ns();

		data->timestamp = iio_get_time_ns(indio_dev);

	}



	/*
@@ -1303,7 +1303,7 @@ static irqreturn_t bmc150_accel_irq_handler(int irq, void *private) 
	int i;



	data->old_timestamp = data->timestamp;

	data->timestamp = iio_get_time_ns();

	data->timestamp = iio_get_time_ns(indio_dev);



	for (i = 0; i < BMC150_ACCEL_TRIGGERS; i++) {

		if (data->triggers[i].enabled) {

drivers/iio/accel/kxcjk-1013.c

+1 −1
Original line number Diff line number Diff line
@@ -1129,7 +1129,7 @@ static irqreturn_t kxcjk1013_data_rdy_trig_poll(int irq, void *private) 
	struct iio_dev *indio_dev = private;

	struct kxcjk1013_data *data = iio_priv(indio_dev);



	data->timestamp = iio_get_time_ns();

	data->timestamp = iio_get_time_ns(indio_dev);



	if (data->dready_trigger_on)

		iio_trigger_poll(data->dready_trig);