1 files changed, 56 insertions, 0 deletions
diff --git a/include/linux/comedi/comedilib.h b/include/linux/comedi/comedilib.h
new file mode 100644
index 000000000000..1f2b22b383cc
--- /dev/null
+++ b/include/linux/comedi/comedilib.h
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * comedilib.h
+ * Header file for kcomedilib
+ *
+ * COMEDI - Linux Control and Measurement Device Interface
+ * Copyright (C) 1998-2001 David A. Schleef <ds@schleef.org>
+ */
+
+#ifndef _LINUX_COMEDILIB_H
+#define _LINUX_COMEDILIB_H
+
+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,
+		      unsigned int chan, unsigned int io);
+int comedi_dio_bitfield2(struct comedi_device *dev, unsigned int subdev,
+			 unsigned int mask, unsigned int *bits,
+			 unsigned int base_channel);
+int comedi_find_subdevice_by_type(struct comedi_device *dev, int type,
+				  unsigned int subd);
+int comedi_get_n_channels(struct comedi_device *dev, unsigned int subdevice);
+
+#endif