From cf196d53c94a51797733e199c0dfb6989f912327 Mon Sep 17 00:00:00 2001
From: Sung-Jin Park <sj76.park@samsung.com>
Date: Mon, 20 Aug 2018 16:21:43 +0900
Subject: [PATCH] udev-seat: add apis to set udev monitor's event source and
 buffer size

Change-Id: Ib41e5421c174e2d5cc26bc19f077a045ad7a2e19
Signed-off-by: Sung-Jin Park <sj76.park@samsung.com>
---
 src/libinput.h   | 22 +++++++++++++++++++
 src/libinput.sym |  2 ++
 src/udev-seat.c  | 55 +++++++++++++++++++++++++++++++++++++++++++-----
 3 files changed, 74 insertions(+), 5 deletions(-)

diff --git a/src/libinput.h b/src/libinput.h
index e0ec4a76..b9eee5b1 100644
--- a/src/libinput.h
+++ b/src/libinput.h
@@ -3907,6 +3907,28 @@ int
 libinput_udev_assign_seat(struct libinput *libinput,
 			  const char *seat_id);
 
+/**
+ * @ingroup base
+ *
+ * Set the event source of udev monitor.
+ * The default event source of udev monitor is "udev".
+ *
+ * @param source The event source of udev monitor
+ */
+void
+libinput_udev_set_udev_monitor_event_source(const char *source);
+
+/**
+ * @ingroup base
+ *
+ * Set the buffer size of udev monitor.
+ *
+ * @param size The buffer size of udev monitor.
+ * @return 0 on success or -1 on failure.
+ */
+int
+libinput_udev_set_udev_monitor_buffer_size(int size);
+
 /**
  * @ingroup base
  *
diff --git a/src/libinput.sym b/src/libinput.sym
index a8266634..7502dbac 100644
--- a/src/libinput.sym
+++ b/src/libinput.sym
@@ -309,6 +309,8 @@ LIBINPUT_1.7 {
 	libinput_event_switch_get_switch;
 	libinput_event_switch_get_time;
 	libinput_event_switch_get_time_usec;
+	libinput_udev_set_udev_monitor_event_source;
+	libinput_udev_set_udev_monitor_buffer_size;
 } LIBINPUT_1.5;
 
 LIBINPUT_1.9 {
diff --git a/src/udev-seat.c b/src/udev-seat.c
index a276601f..909809ac 100644
--- a/src/udev-seat.c
+++ b/src/udev-seat.c
@@ -34,6 +34,21 @@
 static const char default_seat[] = "seat0";
 static const char default_seat_name[] = "default";
 
+char *_udev_monitor_event_source = NULL;
+int _udev_monitor_buffer_size = 0;
+
+static char *
+_udev_get_udev_monitor_event_source(void)
+{
+	return _udev_monitor_event_source;
+}
+
+static int
+_udev_get_udev_monitor_buffer_size(void)
+{
+	return _udev_monitor_buffer_size;
+}
+
 static struct udev_seat *
 udev_seat_create(struct udev_input *input,
 		 const char *device_seat,
@@ -307,15 +322,18 @@ udev_input_enable(struct libinput *libinput)
 	if (input->udev_monitor || !input->seat_id)
 		return 0;
 
-	char *env;
+	char *env = _udev_get_udev_monitor_event_source();
 
-	if ((env = getenv("UDEV_MONITOR_EVENT_SOURCE")))
+	if (env)
 	{
-		log_info(libinput, "udev: event source is %s.\n", env);
 		input->udev_monitor = udev_monitor_new_from_netlink(udev, env);
+		log_info(libinput, "udev: event source is %s.\n", env);
 	}
 	else
+	{
 		input->udev_monitor = udev_monitor_new_from_netlink(udev, "udev");
+		log_info(libinput, "udev: event source is udev (default event source).\n");
+	}
 
 	if (!input->udev_monitor) {
 		log_info(libinput,
@@ -323,8 +341,9 @@ udev_input_enable(struct libinput *libinput)
 		return -1;
 	}
 
-	env = getenv("UDEV_MONITOR_BUFFER_SIZE");
-	if (env && (buf_size = atoi(env)))
+    buf_size = _udev_get_udev_monitor_buffer_size();
+
+	if (buf_size)
 	{
 		log_info(libinput,"udev: set receive buffer size = %d\n", buf_size);
 		udev_monitor_set_receive_buffer_size(input->udev_monitor, buf_size);
@@ -435,6 +454,31 @@ static const struct libinput_interface_backend interface_backend = {
 	.device_change_seat = udev_device_change_seat,
 };
 
+LIBINPUT_EXPORT void
+libinput_udev_set_udev_monitor_event_source(const char *source)
+{
+	if (source)
+	{
+		if (_udev_monitor_event_source)
+		{
+			free(_udev_monitor_event_source);
+			_udev_monitor_event_source = NULL;
+		}
+
+		_udev_monitor_event_source = strdup(source);
+	}
+}
+
+LIBINPUT_EXPORT int
+libinput_udev_set_udev_monitor_buffer_size(int size)
+{
+	if (0 >= size)
+		return -1;
+
+	_udev_monitor_buffer_size = size;
+	return 0;
+}
+
 LIBINPUT_EXPORT struct libinput *
 libinput_udev_create_context(const struct libinput_interface *interface,
 			     void *user_data,
@@ -455,6 +499,7 @@ libinput_udev_create_context(const struct libinput_interface *interface,
 	}
 
 	input->udev = udev_ref(udev);
+	_udev_monitor_event_source = strdup("udev");
 
 	return &input->base;
 }
-- 
2.34.1