3 files changed, 149 insertions, 35 deletions

diff --git a/drivers/staging/iio/industrialio-trigger.c b/drivers/staging/iio/industrialio-trigger.c
index dd762f053850..86d026b2ec31 100644
--- a/drivers/staging/iio/industrialio-trigger.c
+++ b/drivers/staging/iio/industrialio-trigger.c
@@ -181,6 +181,19 @@ irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private)
 }
 EXPORT_SYMBOL(iio_trigger_generic_data_rdy_poll);
 
+void iio_trigger_poll_chained(struct iio_trigger *trig, s64 time)
+{
+	int i;
+	if (!trig->use_count) {
+		for (i = 0; i < CONFIG_IIO_CONSUMERS_PER_TRIGGER; i++)
+			if (trig->subirqs[i].enabled) {
+				trig->use_count++;
+				handle_nested_irq(trig->subirq_base + i);
+			}
+	}
+}
+EXPORT_SYMBOL(iio_trigger_poll_chained);
+
 void iio_trigger_notify_done(struct iio_trigger *trig)
 {
 	trig->use_count--;
diff --git a/drivers/staging/iio/trigger.h b/drivers/staging/iio/trigger.h
index e831a8925782..5efa0d50b720 100644
--- a/drivers/staging/iio/trigger.h
+++ b/drivers/staging/iio/trigger.h
@@ -121,6 +121,7 @@ int iio_trigger_dettach_poll_func(struct iio_trigger *trig,
  * Typically called in relevant hardware interrupt handler.
  **/
 void iio_trigger_poll(struct iio_trigger *trig, s64 time);
+void iio_trigger_poll_chained(struct iio_trigger *trig, s64 time);
 void iio_trigger_notify_done(struct iio_trigger *trig);
 
 irqreturn_t iio_trigger_generic_data_rdy_poll(int irq, void *private);
diff --git a/drivers/staging/iio/trigger/iio-trig-sysfs.c b/drivers/staging/iio/trigger/iio-trig-sysfs.c
index 127a2a33e4db..6d3dee3fdba8 100644
--- a/drivers/staging/iio/trigger/iio-trig-sysfs.c
+++ b/drivers/staging/iio/trigger/iio-trig-sysfs.c
@@ -9,15 +9,84 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
+#include <linux/list.h>
 
 #include "../iio.h"
 #include "../trigger.h"
 
+struct iio_sysfs_trig {
+	struct iio_trigger *trig;
+	int id;
+	struct list_head l;
+};
+
+static LIST_HEAD(iio_sysfs_trig_list);
+static DEFINE_MUTEX(iio_syfs_trig_list_mut);
+
+static int iio_sysfs_trigger_probe(int id);
+static ssize_t iio_sysfs_trig_add(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buf,
+				  size_t len)
+{
+	int ret;
+	unsigned long input;
+
+	ret = strict_strtoul(buf, 10, &input);
+	if (ret)
+		return ret;
+	ret = iio_sysfs_trigger_probe(input);
+	if (ret)
+		return ret;
+	return len;
+}
+static DEVICE_ATTR(add_trigger, S_IWUSR, NULL, &iio_sysfs_trig_add);
+
+static int iio_sysfs_trigger_remove(int id);
+static ssize_t iio_sysfs_trig_remove(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf,
+				     size_t len)
+{
+	int ret;
+	unsigned long input;
+
+	ret = strict_strtoul(buf, 10, &input);
+	if (ret)
+		return ret;
+	ret = iio_sysfs_trigger_remove(input);
+	if (ret)
+		return ret;
+	return len;
+}
+
+static DEVICE_ATTR(remove_trigger, S_IWUSR, NULL, &iio_sysfs_trig_remove);
+
+static struct attribute *iio_sysfs_trig_attrs[] = {
+	&dev_attr_add_trigger.attr,
+	&dev_attr_remove_trigger.attr,
+	NULL,
+};
+
+static const struct attribute_group iio_sysfs_trig_group = {
+	.attrs = iio_sysfs_trig_attrs,
+};
+
+static const struct attribute_group *iio_sysfs_trig_groups[] = {
+	&iio_sysfs_trig_group,
+	NULL
+};
+
+static struct device iio_sysfs_trig_dev = {
+	.bus = &iio_bus_type,
+	.groups = iio_sysfs_trig_groups,
+};
+
 static ssize_t iio_sysfs_trigger_poll(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t count)
 {
 	struct iio_trigger *trig = dev_get_drvdata(dev);
-	iio_trigger_poll(trig, 0);
+	iio_trigger_poll_chained(trig, 0);
 
 	return count;
 }
@@ -35,70 +104,101 @@ static const struct attribute_group iio_sysfs_trigger_attr_group = {
 	.attrs = iio_sysfs_trigger_attrs,
 };
 
-static int __devinit iio_sysfs_trigger_probe(struct platform_device *pdev)
+static int iio_sysfs_trigger_probe(int id)
 {
-	struct iio_trigger *trig;
+	struct iio_sysfs_trig *t;
 	int ret;
+	char *name;
+	bool foundit = false;
+	mutex_lock(&iio_syfs_trig_list_mut);
+	list_for_each_entry(t, &iio_sysfs_trig_list, l)
+		if (id == t->id) {
+			foundit = true;
+			break;
+		}
+	if (foundit) {
+		ret = -EINVAL;
+		goto out1;
+	}
 
-	trig = iio_allocate_trigger();
-	if (!trig) {
+	name = kasprintf(GFP_KERNEL, "sysfstrig%d", id);
+	if (name == NULL) {
 		ret = -ENOMEM;
 		goto out1;
 	}
-
-	trig->control_attrs = &iio_sysfs_trigger_attr_group;
-	trig->owner = THIS_MODULE;
-	trig->name = kasprintf(GFP_KERNEL, "sysfstrig%d", pdev->id);
-	if (trig->name == NULL) {
+	t = kmalloc(sizeof(*t), GFP_KERNEL);
+	if (t == NULL) {
 		ret = -ENOMEM;
-		goto out2;
+		goto free_name;
+	}
+	t->id = id;
+	t->trig = iio_allocate_trigger_named(name);
+	if (!t->trig) {
+		ret = -ENOMEM;
+		goto free_t;
 	}
 
-	ret = iio_trigger_register(trig);
-	if (ret)
-		goto out3;
-
-	platform_set_drvdata(pdev, trig);
+	t->trig->control_attrs = &iio_sysfs_trigger_attr_group;
+	t->trig->owner = THIS_MODULE;
+	t->trig->dev.parent = &iio_sysfs_trig_dev;
 
+	ret = iio_trigger_register(t->trig);
+	if (ret)
+		goto out2;
+	list_add(&t->l, &iio_sysfs_trig_list);
+	__module_get(THIS_MODULE);
+	mutex_unlock(&iio_syfs_trig_list_mut);
 	return 0;
-out3:
-	kfree(trig->name);
+
 out2:
-	iio_put_trigger(trig);
+	iio_put_trigger(t->trig);
+free_t:
+	kfree(t);
+free_name:
+	kfree(name);
 out1:
-
+	mutex_unlock(&iio_syfs_trig_list_mut);
 	return ret;
 }
 
-static int __devexit iio_sysfs_trigger_remove(struct platform_device *pdev)
+static int iio_sysfs_trigger_remove(int id)
 {
-	struct iio_trigger *trig = platform_get_drvdata(pdev);
+	bool foundit = false;
+	struct iio_sysfs_trig *t;
+	mutex_lock(&iio_syfs_trig_list_mut);
+	list_for_each_entry(t, &iio_sysfs_trig_list, l)
+		if (id == t->id) {
+			foundit = true;
+			break;
+		}
+	if (!foundit) {
+		mutex_unlock(&iio_syfs_trig_list_mut);
+		return -EINVAL;
+	}
 
-	iio_trigger_unregister(trig);
-	kfree(trig->name);
-	iio_put_trigger(trig);
+	iio_trigger_unregister(t->trig);
+	kfree(t->trig->name);
+	iio_free_trigger(t->trig);
 
+	list_del(&t->l);
+	kfree(t);
+	module_put(THIS_MODULE);
+	mutex_unlock(&iio_syfs_trig_list_mut);
 	return 0;
 }
 
-static struct platform_driver iio_sysfs_trigger_driver = {
-	.driver = {
-		.name = "iio_sysfs_trigger",
-		.owner = THIS_MODULE,
-	},
-	.probe = iio_sysfs_trigger_probe,
-	.remove = __devexit_p(iio_sysfs_trigger_remove),
-};
 
 static int __init iio_sysfs_trig_init(void)
 {
-	return platform_driver_register(&iio_sysfs_trigger_driver);
+	device_initialize(&iio_sysfs_trig_dev);
+	dev_set_name(&iio_sysfs_trig_dev, "iio_sysfs_trigger");
+	return device_add(&iio_sysfs_trig_dev);
 }
 module_init(iio_sysfs_trig_init);
 
 static void __exit iio_sysfs_trig_exit(void)
 {
-	platform_driver_unregister(&iio_sysfs_trigger_driver);
+	device_unregister(&iio_sysfs_trig_dev);
 }
 module_exit(iio_sysfs_trig_exit);