Added new zio trigger file

Signed-off-by: Miguel Gomez <magomez@igalia.com>

drivers/Makefile

@@ -11,7 +11,7 @@ ccflags-y = -I$(ZIO)/include -I$(SPEC_SW)/kernel -I$M -I$(SPEC_SW)/kernel/includ
 
 subdirs-ccflags-y = $(ccflags-y)
 
-obj-m := spec-tdc.o
+obj-m := spec-tdc.o zio-trig-tdc.o
 
 spec-tdc-objs	=  tdc-core.o tdc-zio.o tdc-fmc.o tdc-acam.o tdc-dma.o
 

drivers/zio-trig-tdc.c

+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+
+#include <linux/zio.h>
+#include <linux/zio-sysfs.h>
+#include <linux/zio-buffer.h>
+#include <linux/zio-trigger.h>
+
+#define ZTT_DEFAULT_BLOCK_SIZE 16
+
+static DEFINE_ZATTR_STD(TRIG, ztt_std_attr) = {
+	ZATTR_REG(trig, ZATTR_TRIG_NSAMPLES, S_IRUGO | S_IWUGO,
+		  0 /* no addr needed */, ZTT_DEFAULT_BLOCK_SIZE),
+};
+
+int ztt_conf_set(struct device *dev, struct zio_attribute *zattr,
+		 uint32_t  usr_val)
+{
+	zattr->value = usr_val;
+	return 0;
+}
+
+struct zio_sysfs_operations ztt_s_ops = {
+	.conf_set = ztt_conf_set,
+};
+
+static struct zio_ti *ztt_create(struct zio_trigger_type *trig,
+				 struct zio_cset *cset,
+				 struct zio_control *ctrl, fmode_t flags)
+{
+	struct zio_ti *ti;
+
+	ti = kzalloc(sizeof(*ti), GFP_KERNEL);
+	if (!ti)
+		return ERR_PTR(-ENOMEM);
+
+	return ti;
+}
+
+static void ztt_destroy(struct zio_ti *ti)
+{
+	kfree(ti);
+}
+
+static const struct zio_trigger_operations ztt_trigger_ops = {
+	.create = ztt_create,
+	.destroy = ztt_destroy,
+};
+
+static struct zio_trigger_type ztt_trigger = {
+	.owner = THIS_MODULE,
+	.zattr_set = {
+		.std_zattr = ztt_std_attr,
+	},
+	.s_op = &ztt_s_ops,
+	.t_op = &ztt_trigger_ops,
+};
+
+static int zio_trig_tdc_init(void)
+{
+	return zio_register_trig(&ztt_trigger, "tdc");
+}
+
+static void zio_trig_tdc_exit(void)
+{
+	zio_unregister_trig(&ztt_trigger);
+}
+
+module_init(zio_trig_tdc_init);
+module_exit(zio_trig_tdc_exit);
+MODULE_LICENSE("GPL");