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Input: allow drivers specify timestamp for input events

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Currently, evdev stamps events with timestamps acquired in evdev_events()
However, this timestamping may not be accurate in terms of measuring
when the actual event happened.

Let's allow individual drivers specify timestamp in order to provide a more
accurate sense of time for the event. It is expected that drivers will set the
timestamp in their hard interrupt routine.

Signed-off-by: Atif Niyaz <atifniyaz@google.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Atif Niyaz 2019-07-24 22:26:31 +03:00 • committed by Dmitry Torokhov
parent c2433827c1
commit 3b51c44bd6
3 changed files with 62 additions and 27 deletions
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14
include/linux/input.h
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@ -33,6 +33,13 @@ struct input_value {
__s32 value;
};
enum input_clock_type {
INPUT_CLK_REAL = 0,
INPUT_CLK_MONO,
INPUT_CLK_BOOT,
INPUT_CLK_MAX
};
/**
* struct input_dev - represents an input device
* @name: name of the device
@ -114,6 +121,8 @@ struct input_value {
* @vals: array of values queued in the current frame
* @devres_managed: indicates that devices is managed with devres framework
* and needs not be explicitly unregistered or freed.
* @timestamp: storage for a timestamp set by input_set_timestamp called
* by a driver
*/
struct input_dev {
const char *name;
@ -184,6 +193,8 @@ struct input_dev {
struct input_value *vals;
bool devres_managed;
ktime_t timestamp[INPUT_CLK_MAX];
};
#define to_input_dev(d) container_of(d, struct input_dev, dev)
@ -382,6 +393,9 @@ void input_close_device(struct input_handle *);
int input_flush_device(struct input_handle *handle, struct file *file);
void input_set_timestamp(struct input_dev *dev, ktime_t timestamp);
ktime_t *input_get_timestamp(struct input_dev *dev);
void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value);
void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value);