From 3359e84a8d937b96153af9b1d608b68f9c0a949b Mon Sep 17 00:00:00 2001
From: Tzafrir Cohen <tzafrir.cohen@xorcom.com>
Date: Wed, 23 May 2012 12:35:56 +0000
Subject: sysfs: add a linecompat span attribute

This way, dahdi_genconf may gather needed information without issuing
ioctl()'s

Signed-off-by: Shaun Ruffell <sruffell@digium.com>
Acked-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@10684 a0bf4364-ded3-4de4-8d8a-66a801d63aff
---
 drivers/dahdi/dahdi-base.c  | 25 +++++++++++++++++++++++++
 drivers/dahdi/dahdi-sysfs.c | 23 +++++++++++++++++++++++
 include/dahdi/kernel.h      |  1 +
 3 files changed, 49 insertions(+)

diff --git a/drivers/dahdi/dahdi-base.c b/drivers/dahdi/dahdi-base.c
index eddd137..367b951 100644
--- a/drivers/dahdi/dahdi-base.c
+++ b/drivers/dahdi/dahdi-base.c
@@ -749,6 +749,31 @@ const char *dahdi_spantype2str(enum spantypes st)
 }
 EXPORT_SYMBOL(dahdi_spantype2str);
 
+
+const char *dahdi_lineconfig_bit_name(int lineconfig_bit)
+{
+	static const char * const table[] = {
+			/* These apply to T1 */
+			[4]	= "D4",
+			[5]	= "ESF",
+			[6]	= "AMI",
+			[7]	= "B8ZS",
+			/* These apply to E1 */
+			[8]	= "CCS",
+			[9]	= "HDB3",
+			[10]	= "CRC4",
+			/* These apply to BRI */
+			[11]	= "NTTE",
+			[12]	= "TERM",
+			/* Finish */
+			[16]	= "NOTOPEN",
+		};
+	if (lineconfig_bit < 0 || lineconfig_bit >= ARRAY_SIZE(table))
+		return NULL;
+	return table[lineconfig_bit];
+}
+EXPORT_SYMBOL(dahdi_lineconfig_bit_name);
+
 #ifdef CONFIG_PROC_FS
 static const char *sigstr(int sig)
 {
diff --git a/drivers/dahdi/dahdi-sysfs.c b/drivers/dahdi/dahdi-sysfs.c
index 8bfbb9a..d7bf608 100644
--- a/drivers/dahdi/dahdi-sysfs.c
+++ b/drivers/dahdi/dahdi-sysfs.c
@@ -26,6 +26,7 @@
 #include <dahdi/kernel.h>
 #include <linux/device.h>
 #include <linux/slab.h>
+#include <linux/ctype.h>
 
 #include "dahdi.h"
 #include "dahdi-sysfs.h"
@@ -201,6 +202,27 @@ static BUS_ATTR_READER(lineconfig_show, dev, buf)
 	return len;
 }
 
+static BUS_ATTR_READER(linecompat_show, dev, buf)
+{
+	struct dahdi_span *span;
+	int bit;
+	int len = 0;
+
+	span = dev_to_span(dev);
+	for (bit = 4; bit <= 12; bit++) {
+		if (span->linecompat & (1 << bit)) {
+			const char *name = dahdi_lineconfig_bit_name(bit);
+			if (name)
+				len += sprintf(buf + len, "%s ", name);
+		}
+	}
+	/* chomp */
+	while (len > 0 && isspace(buf[len - 1]))
+		buf[--len] = '\0';
+	len += sprintf(buf + len, "\n");
+	return len;
+}
+
 static struct device_attribute span_dev_attrs[] = {
 	__ATTR_RO(name),
 	__ATTR_RO(desc),
@@ -214,6 +236,7 @@ static struct device_attribute span_dev_attrs[] = {
 	__ATTR_RO(basechan),
 	__ATTR_RO(channels),
 	__ATTR_RO(lineconfig),
+	__ATTR_RO(linecompat),
 	__ATTR_NULL,
 };
 
diff --git a/include/dahdi/kernel.h b/include/dahdi/kernel.h
index d1f8631..08c1c41 100644
--- a/include/dahdi/kernel.h
+++ b/include/dahdi/kernel.h
@@ -806,6 +806,7 @@ enum spantypes {
 };
 const char *dahdi_spantype2str(enum spantypes st);
 enum spantypes dahdi_str2spantype(const char *name);
+const char *dahdi_lineconfig_bit_name(int lineconfig_bit);
 
 struct file;
 
-- 
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