mts-io: clean up accessory card support

	use custom kernel config option MTS_NUM_ACCESSORY_PORTS to find out how many slots exist
	(mostly) dynamically handle any number of accessory cards
	streamline code to make it easier to add accessory cards in the future

1 files changed, 22 insertions, 0 deletions

diff --git a/io-module/mtac.c b/io-module/mtac.c
new file mode 100644
index 0000000..b9a2520
--- /dev/null
+++ b/io-module/mtac.c
@@ -0,0 +1,22 @@
+static struct kobj_attribute* create_attribute(const char* _name, umode_t _mode) {
+	char* attr_name;
+	struct kobj_attribute* _attr;
+	
+	_attr = kzalloc(sizeof(struct kobj_attribute), GFP_KERNEL);
+	if (! _attr) {
+		log_error("kzalloc of attribute %s failed", _name);
+		return NULL;
+	}
+
+	sysfs_attr_init(_attr);
+	attr_name = kstrdup(_name, GFP_KERNEL);
+	if (! attr_name) {
+		log_error("GFP_KERNEL dup failed for attribute [%s]", _name);
+		return NULL;
+	}
+
+	_attr->attr.name = attr_name;
+	_attr->attr.mode = _mode;
+
+	return _attr;
+}