From: Bartosz Golaszewski <bartekgola@gmail.com>
Date: Mon, 9 Jan 2017 14:03:55 +0000 (+0100)
Subject: core: implement gpiod_line_is_free()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=5012e3c3d36293084bde71d065bc5c452e07130c;p=qemu-gpiodev%2Flibgpiod.git

core: implement gpiod_line_is_free()

This routine allows the user to check if neither ownership nor any
event notifications were requested for this line.

Signed-off-by: Bartosz Golaszewski <bartekgola@gmail.com>
---

diff --git a/core.c b/core.c
index 085094b..eefcff7 100644
--- a/core.c
+++ b/core.c
@@ -440,6 +440,11 @@ bool gpiod_line_is_reserved(struct gpiod_line *line)
 	return line->reserved_status == LINE_RESERVED;
 }
 
+bool gpiod_line_is_free(struct gpiod_line *line)
+{
+	return line->reserved_status == LINE_FREE;
+}
+
 static bool line_bulk_is_reserved(struct gpiod_line_bulk *line_bulk)
 {
 	unsigned int i;
diff --git a/gpiod.h b/gpiod.h
index 473f41e..dbb103b 100644
--- a/gpiod.h
+++ b/gpiod.h
@@ -385,6 +385,14 @@ void gpiod_line_release_bulk(struct gpiod_line_bulk *line_bulk) GPIOD_API;
  */
 bool gpiod_line_is_reserved(struct gpiod_line *line) GPIOD_API;
 
+/**
+ * @brief Check if the calling user has neither requested ownership of this
+ *        line nor configured any event notifications.
+ * @param line GPIO line object.
+ * @return True if given line is free, false otherwise.
+ */
+bool gpiod_line_is_free(struct gpiod_line *line) GPIOD_API;
+
 /**
  * @brief Read current value of a single GPIO line.
  * @param line GPIO line object.