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iio:core: timestamping clock selection support

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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: Gregor Boirie <gregor.boirie@parrot.com>
Acked-by: Sanchayan Maity <maitysanchayan@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Gregor Boirie
2016-03-09 19:05:49 +01:00
committed by Jonathan Cameron
parent eaaa7ec71b
commit bc2b7dab62
69 changed files with 327 additions and 114 deletions
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5
drivers/iio/adc/max1363.c
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@@ -788,7 +788,7 @@ static irqreturn_t max1363_event_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct max1363_state *st = iio_priv(indio_dev);
s64 timestamp = iio_get_time_ns();
s64 timestamp = iio_get_time_ns(indio_dev);
unsigned long mask, loc;
u8 rx;
u8 tx[2] = { st->setupbyte,
@@ -1506,7 +1506,8 @@ static irqreturn_t max1363_trigger_handler(int irq, void *p)
if (b_sent < 0)
goto done_free;
iio_push_to_buffers_with_timestamp(indio_dev, rxbuf, iio_get_time_ns());
iio_push_to_buffers_with_timestamp(indio_dev, rxbuf,
iio_get_time_ns(indio_dev));
done_free:
kfree(rxbuf);