[RFC][PATCH] Input: Add infrastrucutre for selecting clockid for event time stamps.

[John Stultz <john.stultz@linaro.org>]

Here's another revision, incorperating Dmitry's suggestion.

As noted by Arve and others, since wall time can jump backwards, it
is difficult to use for input because one cannot determine if one
event occured before another or for how long a key was pressed.

However, the timestamp field is part of the kernel ABI, and cannot
be changed without possibly breaking existing users.

This patch adds a new IOCTL that allows a clockid to be set in
the evdev_client struct that will specify which time base to
use for event timestamps (ie: CLOCK_MONOTONIC instead
of CLOCK_REALTIME).

For now we only support CLOCK_MONOTONIC and CLOCK_REALTIME, but
in the future we could support other clockids if appropriate.

The default remains CLOCK_REALTIME, so we don't change the ABI.

CC: Dmitry Torokhov <dmitry.torokhov@gmail.com>
CC: Daniel Kurtz <djkurtz@google.com>
CC: linux-input@vger.kernel.org
CC: Arve Hjønnevåg <arve@android.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
 drivers/input/evdev.c |   33 +++++++++++++++++++++++++++++----
 include/linux/input.h |    2 ++
 2 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index 4cf2534..4b71484 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -46,6 +46,7 @@ struct evdev_client {
 	struct fasync_struct *fasync;
 	struct evdev *evdev;
 	struct list_head node;
+	bool timestamp_clkid;
 	unsigned int bufsize;
 	struct input_event buffer[];
 };
@@ -54,8 +55,19 @@ static struct evdev *evdev_table[EVDEV_MINORS];
 static DEFINE_MUTEX(evdev_table_mutex);
 
 static void evdev_pass_event(struct evdev_client *client,
-			     struct input_event *event)
+			     struct input_event *event,
+			     ktime_t mono, ktime_t real)
 {
+	struct timespec ts;
+
+	if (client->timestamp_clkid == CLOCK_MONOTONIC)
+		ts = ktime_to_timespec(mono);
+	else
+		ts = ktime_to_timespec(real);
+	event->time.tv_sec = ts.tv_sec;
+	event->time.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
+
+
 	/* Interrupts are disabled, just acquire the lock. */
 	spin_lock(&client->buffer_lock);
 
@@ -94,8 +106,11 @@ static void evdev_event(struct input_handle *handle,
 	struct evdev *evdev = handle->private;
 	struct evdev_client *client;
 	struct input_event event;
+	ktime_t time_mono, time_real;
+
+	time_mono = ktime_get();
+	time_real = ktime_sub(time_mono, ktime_get_monotonic_offset());
 
-	do_gettimeofday(&event.time);
 	event.type = type;
 	event.code = code;
 	event.value = value;
@@ -103,11 +118,12 @@ static void evdev_event(struct input_handle *handle,
 	rcu_read_lock();
 
 	client = rcu_dereference(evdev->grab);
+
 	if (client)
-		evdev_pass_event(client, &event);
+		evdev_pass_event(client, &event, time_mono, time_real);
 	else
 		list_for_each_entry_rcu(client, &evdev->client_list, node)
-			evdev_pass_event(client, &event);
+			evdev_pass_event(client, &event, time_mono, time_real);
 
 	rcu_read_unlock();
 
@@ -683,6 +699,15 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
 		else
 			return evdev_ungrab(evdev, client);
 
+	case EVIOCCLOCKID:
+		if (copy_from_user(&i, p, sizeof(unsigned int)))
+			return -EFAULT;
+		if ((i == CLOCK_MONOTONIC) || (i == CLOCK_REALTIME)) {
+			client->timestamp_clkid = i;
+			return 0;
+		}
+		return -EINVAL;
+
 	case EVIOCGKEYCODE:
 		return evdev_handle_get_keycode(dev, p);
 
diff --git a/include/linux/input.h b/include/linux/input.h
index 3862e32..9618e14 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -129,6 +129,8 @@ struct input_keymap_entry {
 
 #define EVIOCGRAB		_IOW('E', 0x90, int)			/* Grab/Release device */
 
+#define EVIOCCLOCKID		_IOW('E', 0xA0, int)			/* Set clockid to be used for timestamps */
+
 /*
  * Device properties and quirks
  */
-- 
1.7.3.2.146.gca209

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