From 2a720182e41ed6b2d7dac4f984e55e844c4e6d15 Mon Sep 17 00:00:00 2001
From: Frank Mori Hess <fmhess@speakeasy.net>
Date: Sun, 6 Mar 2005 17:42:56 +0000
Subject: [PATCH] added comedi_dio_get_config()

---
 doc/funcref         | 16 ++++++++++++++++
 include/comedilib.h |  2 ++
 lib/dio.c           | 32 ++++++++++++++++++++++++++++++++
 lib/version_script  |  1 +
 4 files changed, 51 insertions(+)

diff --git a/doc/funcref b/doc/funcref
index 04e25e1..fb68ca0 100644
--- a/doc/funcref
+++ b/doc/funcref
@@ -576,6 +576,22 @@ Description:
 
  If sucessful, 1 is returned, otherwise -1.
 
+Function: comedi_dio_get_config -- query input/output properties of channel
+Retval: int
+Param: comedi_t * device
+Param: unsigned int subdevice
+Param: unsigned int channel
+Param: unsigned int * direction
+Description:
+ The function comedi_dio_get_config() querys the configuration of
+ an individual channel
+ in a digital I/O subdevice (see comedi_dio_config()).
+ On success, the variable specified by the "direction" pointer will
+ be set to either COMEDI_INPUT or COMEDI_OUTPUT.
+
+ If sucessful, 0 is returned, otherwise -1.
+
+
 Function: comedi_dio_read -- read single bit from digital channel
 Retval: int
 Param: comedi_t * device
diff --git a/include/comedilib.h b/include/comedilib.h
index f5ab0ae..b4905b5 100644
--- a/include/comedilib.h
+++ b/include/comedilib.h
@@ -141,6 +141,8 @@ int comedi_data_write(comedi_t *it,unsigned int subd,unsigned int chan,
 	unsigned int range,unsigned int aref,lsampl_t data);
 int comedi_dio_config(comedi_t *it,unsigned int subd,unsigned int chan,
 	unsigned int dir);
+int comedi_dio_get_config(comedi_t *it,unsigned int subd,unsigned int chan,
+	unsigned int *dir);
 int comedi_dio_read(comedi_t *it,unsigned int subd,unsigned int chan,
 	unsigned int *bit);
 int comedi_dio_write(comedi_t *it,unsigned int subd,unsigned int chan,
diff --git a/lib/dio.c b/lib/dio.c
index 3aabb10..def2aba 100644
--- a/lib/dio.c
+++ b/lib/dio.c
@@ -79,6 +79,38 @@ int _comedi_dio_config(comedi_t *it,unsigned int subdev,unsigned int chan,unsign
 	}
 }
 
+EXPORT_ALIAS_DEFAULT(_comedi_dio_get_config, comedi_dio_get_config, 0.7.23);
+int _comedi_dio_get_config(comedi_t *it,unsigned int subdev, unsigned int chan, unsigned int *io)
+{
+	subdevice *s;
+	comedi_insn insn;
+	lsampl_t data[2];
+	int retval;
+	
+	if(!valid_chan(it,subdev,chan))
+		return -1;
+	
+	s=it->subdevices+subdev;
+	if(s->type!=COMEDI_SUBD_DIO)
+		return -1;
+
+	if(it->has_insnlist_ioctl == 0)
+		return -1;
+	
+	memset(&insn,0,sizeof(insn));
+	insn.insn = INSN_CONFIG;
+	insn.n = sizeof(data) / sizeof(data[0]);
+	insn.data = data;
+	insn.subdev = subdev;
+	insn.chanspec = CR_PACK(chan,0,0);
+	data[0] = INSN_CONFIG_DIO_QUERY;
+
+	retval = comedi_do_insn(it,&insn);
+	if(retval < 0) return retval;
+	*io = data[1];
+	return 0;
+}
+
 EXPORT_ALIAS_DEFAULT(_comedi_dio_read,comedi_dio_read,0.7.18);
 int _comedi_dio_read(comedi_t *it,unsigned int subdev,unsigned int chan,
 	unsigned int *val)
diff --git a/lib/version_script b/lib/version_script
index 0a67f04..52aba8f 100644
--- a/lib/version_script
+++ b/lib/version_script
@@ -83,5 +83,6 @@ v0.7.20 {
 
 v0.7.23 {
 	global:
+		comedi_dio_get_config;
 		comedi_mark_buffer_written;
 } v0.7.20;
-- 
2.26.2