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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
Download patch file Download diff file Expand all files Collapse all files

35
drivers/input/evdev.c
View file

@ -25,13 +25,6 @@
#include <linux/cdev.h>
#include "input-compat.h"
enum evdev_clock_type {
EV_CLK_REAL = 0,
EV_CLK_MONO,
EV_CLK_BOOT,
EV_CLK_MAX
};
struct evdev {
int open;
struct input_handle handle;
@ -53,7 +46,7 @@ struct evdev_client {
struct fasync_struct *fasync;
struct evdev *evdev;
struct list_head node;
unsigned int clk_type;
enum input_clock_type clk_type;
bool revoked;
unsigned long *evmasks[EV_CNT];
unsigned int bufsize;
@ -149,17 +142,10 @@ static void __evdev_flush_queue(struct evdev_client *client, unsigned int type)
static void __evdev_queue_syn_dropped(struct evdev_client *client)
{
ktime_t *ev_time = input_get_timestamp(client->evdev->handle.dev);
struct timespec64 ts = ktime_to_timespec64(ev_time[client->clk_type]);
struct input_event ev;
ktime_t time;
struct timespec64 ts;
time = client->clk_type == EV_CLK_REAL ?
ktime_get_real() :
client->clk_type == EV_CLK_MONO ?
ktime_get() :
ktime_get_boottime();
ts = ktime_to_timespec64(time);
ev.input_event_sec = ts.tv_sec;
ev.input_event_usec = ts.tv_nsec / NSEC_PER_USEC;
ev.type = EV_SYN;
@ -188,18 +174,18 @@ static void evdev_queue_syn_dropped(struct evdev_client *client)
static int evdev_set_clk_type(struct evdev_client *client, unsigned int clkid)
{
unsigned long flags;
unsigned int clk_type;
enum input_clock_type clk_type;
switch (clkid) {
case CLOCK_REALTIME:
clk_type = EV_CLK_REAL;
clk_type = INPUT_CLK_REAL;
break;
case CLOCK_MONOTONIC:
clk_type = EV_CLK_MONO;
clk_type = INPUT_CLK_MONO;
break;
case CLOCK_BOOTTIME:
clk_type = EV_CLK_BOOT;
clk_type = INPUT_CLK_BOOT;
break;
default:
return -EINVAL;
@ -307,12 +293,7 @@ static void evdev_events(struct input_handle *handle,
{
struct evdev *evdev = handle->private;
struct evdev_client *client;
ktime_t ev_time[EV_CLK_MAX];
ev_time[EV_CLK_MONO] = ktime_get();
ev_time[EV_CLK_REAL] = ktime_mono_to_real(ev_time[EV_CLK_MONO]);
ev_time[EV_CLK_BOOT] = ktime_mono_to_any(ev_time[EV_CLK_MONO],
TK_OFFS_BOOT);
ktime_t *ev_time = input_get_timestamp(handle->dev);
rcu_read_lock();