2 files changed, 39 insertions, 2 deletions

diff --git a/include/linux/comedi/comedidev.h b/include/linux/comedi/comedidev.h
index 4cb0400ad616..35fdc41845ce 100644
--- a/include/linux/comedi/comedidev.h
+++ b/include/linux/comedi/comedidev.h
@@ -15,6 +15,7 @@
 #include <linux/spinlock_types.h>
 #include <linux/rwsem.h>
 #include <linux/kref.h>
+#include <linux/completion.h>
 #include <linux/comedi.h>
 
 #define COMEDI_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
@@ -272,6 +273,8 @@ struct comedi_buf_map {
  * @events: Bit-vector of events that have occurred.
  * @cmd: Details of comedi command in progress.
  * @wait_head: Task wait queue for file reader or writer.
+ * @run_complete: "run complete" completion event.
+ * @run_active: "run active" reference counter.
  * @cb_mask: Bit-vector of events that should wake waiting tasks.
  * @inttrig: Software trigger function for command, or NULL.
  *
@@ -357,6 +360,8 @@ struct comedi_async {
 	unsigned int events;
 	struct comedi_cmd cmd;
 	wait_queue_head_t wait_head;
+	struct completion run_complete;
+	refcount_t run_active;
 	unsigned int cb_mask;
 	int (*inttrig)(struct comedi_device *dev, struct comedi_subdevice *s,
 		       unsigned int x);
@@ -584,6 +589,8 @@ struct comedi_device *comedi_dev_get_from_minor(unsigned int minor);
 int comedi_dev_put(struct comedi_device *dev);
 
 bool comedi_is_subdevice_running(struct comedi_subdevice *s);
+bool comedi_get_is_subdevice_running(struct comedi_subdevice *s);
+void comedi_put_is_subdevice_running(struct comedi_subdevice *s);
 
 void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size);
 void comedi_set_spriv_auto_free(struct comedi_subdevice *s);
diff --git a/include/linux/comedi/comedilib.h b/include/linux/comedi/comedilib.h
index 0223c9cd9215..1f2b22b383cc 100644
--- a/include/linux/comedi/comedilib.h
+++ b/include/linux/comedi/comedilib.h
@@ -10,8 +10,38 @@
 #ifndef _LINUX_COMEDILIB_H
 #define _LINUX_COMEDILIB_H
 
-struct comedi_device *comedi_open(const char *path);
-int comedi_close(struct comedi_device *dev);
+struct comedi_device *comedi_open_from(const char *path, int from);
+
+/**
+ * comedi_open() - Open a COMEDI device from the kernel
+ * @filename: Fake pathname of the form "/dev/comediN".
+ *
+ * Converts @filename to a COMEDI device number and "opens" it if it exists
+ * and is attached to a low-level COMEDI driver.
+ *
+ * Return: A pointer to the COMEDI device on success.
+ * Return %NULL on failure.
+ */
+static inline struct comedi_device *comedi_open(const char *path)
+{
+	return comedi_open_from(path, -1);
+}
+
+int comedi_close_from(struct comedi_device *dev, int from);
+
+/**
+ * comedi_close() - Close a COMEDI device from the kernel
+ * @dev: COMEDI device.
+ *
+ * Closes a COMEDI device previously opened by comedi_open().
+ *
+ * Returns: 0
+ */
+static inline int comedi_close(struct comedi_device *dev)
+{
+	return comedi_close_from(dev, -1);
+}
+
 int comedi_dio_get_config(struct comedi_device *dev, unsigned int subdev,
 			  unsigned int chan, unsigned int *io);
 int comedi_dio_config(struct comedi_device *dev, unsigned int subdev,