1 files changed, 76 insertions, 0 deletions
diff --git a/drivers/staging/comedi/drivers/comedi_fc.h b/drivers/staging/comedi/drivers/comedi_fc.h
new file mode 100644
index 000000000000..6952fe20f273
--- /dev/null
+++ b/drivers/staging/comedi/drivers/comedi_fc.h
@@ -0,0 +1,76 @@
+/*
+    comedi_fc.h
+
+    This is a place for code driver writers wish to share between
+    two or more drivers. These functions are meant to be used only
+    by drivers, they are NOT part of the kcomedilib API!
+
+    Author:  Frank Mori Hess <fmhess@users.sourceforge.net>
+    Copyright (C) 2002 Frank Mori Hess
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+************************************************************************/
+
+#ifndef _COMEDI_FC_H
+#define _COMEDI_FC_H
+
+#include "../comedidev.h"
+
+/* Writes an array of data points to comedi's buffer */
+extern unsigned int cfc_write_array_to_buffer(comedi_subdevice *subd,
+					      void *data,
+					      unsigned int num_bytes);
+
+static inline unsigned int cfc_write_to_buffer(comedi_subdevice *subd,
+					       sampl_t data)
+{
+	return cfc_write_array_to_buffer(subd, &data, sizeof(data));
+};
+
+static inline unsigned int cfc_write_long_to_buffer(comedi_subdevice *subd,
+						    lsampl_t data)
+{
+	return cfc_write_array_to_buffer(subd, &data, sizeof(data));
+};
+
+extern unsigned int cfc_read_array_from_buffer(comedi_subdevice *subd,
+					       void *data,
+					       unsigned int num_bytes);
+
+extern unsigned int cfc_handle_events(comedi_device *dev,
+				      comedi_subdevice *subd);
+
+static inline unsigned int cfc_bytes_per_scan(comedi_subdevice *subd)
+{
+	int num_samples;
+	int bits_per_sample;
+
+	switch (subd->type) {
+	case COMEDI_SUBD_DI:
+	case COMEDI_SUBD_DO:
+	case COMEDI_SUBD_DIO:
+		bits_per_sample = 8 * bytes_per_sample(subd);
+		num_samples = (subd->async->cmd.chanlist_len +
+			       bits_per_sample - 1) / bits_per_sample;
+		break;
+	default:
+		num_samples = subd->async->cmd.chanlist_len;
+		break;
+	}
+	return num_samples * bytes_per_sample(subd);
+}
+
+#endif /* _COMEDI_FC_H */