xpp: restore backward compat dahdi_registration

This restores a somewhat limited functionality of the "span"
write interface in the SysFS node of the span, broken by the
pinned-spans code.

* PROBLEM: dahdi-linux pinned-spans should work with existing dahdi-tools
  specifically the dahdi_registration tool.

* As a result, we should still be able to control dahdi registration
  order. However, registration is now in complete devices and not spans

* Restored dahdi_autoreg=[0/1] xpp module parameter:
  - It now refers to complete astribanks and not individual spans

* The xpp module sysfs "span" attribute:
  - Implemented write method (for dahdi_registration tool)
  - The first write of [1/0] to this attribute, registers/unregisters
    the complete astribank
  - Further writes are ignored (with DBG messages)

* Also, implemented new xbus_is_registered() function

* Once the new dahdi-tools are merged, we should turn deprecation
  messages from DBG() to NOTICE()

Signed-off-by: Oron Peled <oron.peled@xorcom.com>
Acked-by Tzafrir Cohen <tzafrir.cohen@xorcom.com>

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@10334 a0bf4364-ded3-4de4-8d8a-66a801d63aff

1 files changed, 43 insertions, 1 deletions

diff --git a/drivers/dahdi/xpp/xbus-sysfs.c b/drivers/dahdi/xpp/xbus-sysfs.c
index ccc1a01..31835bb 100644
--- a/drivers/dahdi/xpp/xbus-sysfs.c
+++ b/drivers/dahdi/xpp/xbus-sysfs.c
@@ -613,6 +613,48 @@ static DEVICE_ATTR_READER(span_show, dev, buf)
 	return len;
 }
 
+/*
+ * For backward compatibility with old dahdi-tools
+ * Remove after dahdi_registration is upgraded
+ */
+static DEVICE_ATTR_WRITER(span_store, dev, buf, count)
+{
+	xpd_t		*xpd;
+	int		dahdi_reg;
+	int		ret;
+
+	BUG_ON(!dev);
+	xpd = dev_to_xpd(dev);
+	if (!xpd)
+		return -ENODEV;
+	ret = sscanf(buf, "%d", &dahdi_reg);
+	if (ret != 1)
+		return -EINVAL;
+	if (!XBUS_IS(xpd->xbus, READY))
+		return -ENODEV;
+	XPD_DBG(DEVICES, xpd,
+		"%s -- deprecated (should use pinned-spans)\n",
+		(dahdi_reg) ? "register" : "unregister");
+	if (xbus_is_registered(xpd->xbus)) {
+		if (dahdi_reg) {
+			XPD_DBG(DEVICES, xpd,
+				"already registered %s. Ignored.\n",
+				xpd->xbus->busname);
+		} else {
+			xbus_unregister_dahdi_device(xpd->xbus);
+		}
+	} else {
+		if (!dahdi_reg) {
+			XPD_DBG(DEVICES, xpd,
+				"already unregistered %s. Ignored.\n",
+				xpd->xbus->busname);
+		} else {
+			xbus_register_dahdi_device(xpd->xbus);
+		}
+	}
+	return count;
+}
+
 static DEVICE_ATTR_READER(type_show, dev, buf)
 {
 	xpd_t		*xpd;
@@ -695,7 +737,7 @@ static int xpd_match(struct device *dev, struct device_driver *driver)
 static struct device_attribute xpd_dev_attrs[] = {
 	__ATTR(chipregs,	S_IRUGO | S_IWUSR, chipregs_show, chipregs_store),
 	__ATTR(blink,		S_IRUGO | S_IWUSR, blink_show, blink_store),
-        __ATTR_RO(span),
+	__ATTR(span,		S_IRUGO | S_IWUSR, span_show, span_store),
         __ATTR_RO(type),
         __ATTR_RO(offhook),
         __ATTR_RO(timing_priority),