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authorGregor Boirie <gregor.boirie@parrot.com>2016-03-09 19:05:49 +0100
committerJonathan Cameron <jic23@kernel.org>2016-06-30 19:41:38 +0100
commitbc2b7dab629a51e8beb5fda4222c62a23b729f26 (patch)
tree302108fe801299d98882e8d506b4415746408374 /include/linux/iio
parenteaaa7ec71bff4cb34d9025ed89068d4b3cac3df0 (diff)
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: Gregor Boirie <gregor.boirie@parrot.com> Acked-by: Sanchayan Maity <maitysanchayan@gmail.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'include/linux/iio')
-rw-r--r--include/linux/iio/iio.h22
1 files changed, 14 insertions, 8 deletions
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 7c29cb0124ae..854e2dad1e0d 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -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)
{
@@ -574,6 +571,15 @@ static inline void iio_device_put(struct iio_dev *indio_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
*