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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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22
include/linux/iio/iio.h
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@@ -312,13 +312,8 @@ static inline bool iio_channel_has_info(const struct iio_chan_spec *chan,
}, \
}
/**
* iio_get_time_ns() - utility function to get a time stamp for events etc
**/
static inline s64 iio_get_time_ns(void)
{
return ktime_get_real_ns();
}
s64 iio_get_time_ns(const struct iio_dev *indio_dev);
unsigned int iio_get_time_res(const struct iio_dev *indio_dev);
/* Device operating modes */
#define INDIO_DIRECT_MODE 0x01
@@ -497,6 +492,7 @@ struct iio_buffer_setup_ops {
* @chan_attr_group: [INTERN] group for all attrs in base directory
* @name: [DRIVER] name of the device.
* @info: [DRIVER] callbacks and constant info from driver
* @clock_id: [INTERN] timestamping clock posix identifier
* @info_exist_lock: [INTERN] lock to prevent use during removal
* @setup_ops: [DRIVER] callbacks to call before and after buffer
* enable/disable
@@ -537,6 +533,7 @@ struct iio_dev {
struct attribute_group chan_attr_group;
const char *name;
const struct iio_info *info;
clockid_t clock_id;
struct mutex info_exist_lock;
const struct iio_buffer_setup_ops *setup_ops;
struct cdev chrdev;
@@ -565,7 +562,7 @@ extern struct bus_type iio_bus_type;
/**
* iio_device_put() - reference counted deallocation of struct device
* @indio_dev: IIO device structure containing the device
* @indio_dev: IIO device structure containing the device
**/
static inline void iio_device_put(struct iio_dev *indio_dev)
{
@@ -573,6 +570,15 @@ static inline void iio_device_put(struct iio_dev *indio_dev)
put_device(&indio_dev->dev);
}
/**
* iio_device_get_clock() - Retrieve current timestamping clock for the device
* @indio_dev: IIO device structure containing the device
*/
static inline clockid_t iio_device_get_clock(const struct iio_dev *indio_dev)
{
return indio_dev->clock_id;
}
/**
* dev_to_iio_dev() - Get IIO device struct from a device struct
* @dev: The device embedded in the IIO device