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Input: evdev - add CLOCK_BOOTTIME support 

This patch adds support for CLOCK_BOOTTIME for input event timestamp.
CLOCK_BOOTTIME includes suspend time, so it would allow aplications
to get correct time difference between two events even when system
resumes from suspend state.

Signed-off-by: Aniroop Mathur <a.mathur@samsung.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Aniroop Mathur 2014-12-17 15:33:06 -08:00 committed by Dmitry Torokhov
parent 2ba3532047
commit aac8bcf1ed
1 changed files with 44 additions and 16 deletions
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60
drivers/input/evdev.c
View File

@ -28,6 +28,13 @@
#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;
@ -49,12 +56,32 @@ struct evdev_client {
struct fasync_struct *fasync;
struct evdev *evdev;
struct list_head node;
int clkid;
int clk_type;
bool revoked;
unsigned int bufsize;
struct input_event buffer[];
};
static int evdev_set_clk_type(struct evdev_client *client, unsigned int clkid)
{
switch (clkid) {
case CLOCK_REALTIME:
client->clk_type = EV_CLK_REAL;
break;
case CLOCK_MONOTONIC:
client->clk_type = EV_CLK_MONO;
break;
case CLOCK_BOOTTIME:
client->clk_type = EV_CLK_BOOT;
break;
default:
return -EINVAL;
}
return 0;
}
/* flush queued events of type @type, caller must hold client->buffer_lock */
static void __evdev_flush_queue(struct evdev_client *client, unsigned int type)
{
@ -108,8 +135,11 @@ static void evdev_queue_syn_dropped(struct evdev_client *client)
struct input_event ev;
ktime_t time;
time = (client->clkid == CLOCK_MONOTONIC) ?
ktime_get() : ktime_get_real();
time = client->clk_type == EV_CLK_REAL ?
ktime_get_real() :
client->clk_type == EV_CLK_MONO ?
ktime_get() :
ktime_get_boottime();
ev.time = ktime_to_timeval(time);
ev.type = EV_SYN;
@ -159,7 +189,7 @@ static void __pass_event(struct evdev_client *client,
static void evdev_pass_values(struct evdev_client *client,
const struct input_value *vals, unsigned int count,
ktime_t mono, ktime_t real)
ktime_t *ev_time)
{
struct evdev *evdev = client->evdev;
const struct input_value *v;
@ -169,8 +199,7 @@ static void evdev_pass_values(struct evdev_client *client,
if (client->revoked)
return;
event.time = ktime_to_timeval(client->clkid == CLOCK_MONOTONIC ?
mono : real);
event.time = ktime_to_timeval(ev_time[client->clk_type]);
/* Interrupts are disabled, just acquire the lock. */
spin_lock(&client->buffer_lock);
@ -198,21 +227,22 @@ static void evdev_events(struct input_handle *handle,
{
struct evdev *evdev = handle->private;
struct evdev_client *client;
ktime_t time_mono, time_real;
ktime_t ev_time[EV_CLK_MAX];
time_mono = ktime_get();
time_real = ktime_mono_to_real(time_mono);
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);
rcu_read_lock();
client = rcu_dereference(evdev->grab);
if (client)
evdev_pass_values(client, vals, count, time_mono, time_real);
evdev_pass_values(client, vals, count, ev_time);
else
list_for_each_entry_rcu(client, &evdev->client_list, node)
evdev_pass_values(client, vals, count,
time_mono, time_real);
evdev_pass_values(client, vals, count, ev_time);
rcu_read_unlock();
}
@ -877,10 +907,8 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
case EVIOCSCLOCKID:
if (copy_from_user(&i, p, sizeof(unsigned int)))
return -EFAULT;
if (i != CLOCK_MONOTONIC && i != CLOCK_REALTIME)
return -EINVAL;
client->clkid = i;
return 0;
return evdev_set_clk_type(client, i);
case EVIOCGKEYCODE:
return evdev_handle_get_keycode(dev, p);