staging:iio:triggers: rename iio-trig-gpio to iio-trig-interrupt

Also change all internal naming appropriately.
This trigger is no longer just for gpio provided interrupts so
change the naming to reflect this.  Also drop some now missleading
left over comments.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>

1 files changed, 152 insertions, 0 deletions

diff --git a/drivers/staging/iio/trigger/iio-trig-interrupt.c b/drivers/staging/iio/trigger/iio-trig-interrupt.c
new file mode 100644
index 000000000000..9afba960e419
--- /dev/null
+++ b/drivers/staging/iio/trigger/iio-trig-interrupt.c
@@ -0,0 +1,152 @@
+/*
+ * Industrial I/O - generic interrupt based trigger support
+ *
+ * Copyright (c) 2008-2013 Jonathan Cameron
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+
+static LIST_HEAD(iio_interrupt_trigger_list);
+static DEFINE_MUTEX(iio_interrupt_trigger_list_lock);
+
+struct iio_interrupt_trigger_info {
+	struct mutex in_use;
+	unsigned int irq;
+};
+
+static irqreturn_t iio_interrupt_trigger_poll(int irq, void *private)
+{
+	/* Timestamp not currently provided */
+	iio_trigger_poll(private, 0);
+	return IRQ_HANDLED;
+}
+
+static const struct iio_trigger_ops iio_interrupt_trigger_ops = {
+	.owner = THIS_MODULE,
+};
+
+static int iio_interrupt_trigger_probe(struct platform_device *pdev)
+{
+	struct iio_interrupt_trigger_info *trig_info;
+	struct iio_trigger *trig, *trig2;
+	unsigned long irqflags;
+	struct resource *irq_res;
+	int irq, ret = 0, irq_res_cnt = 0;
+
+	do {
+		irq_res = platform_get_resource(pdev,
+				IORESOURCE_IRQ, irq_res_cnt);
+
+		if (irq_res == NULL) {
+			if (irq_res_cnt == 0)
+				dev_err(&pdev->dev, "No IRQs specified");
+			break;
+		}
+		irqflags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED;
+
+		for (irq = irq_res->start; irq <= irq_res->end; irq++) {
+
+			trig = iio_trigger_alloc("irqtrig%d", irq);
+			if (!trig) {
+				ret = -ENOMEM;
+				goto error_free_completed_registrations;
+			}
+
+			trig_info = kzalloc(sizeof(*trig_info), GFP_KERNEL);
+			if (!trig_info) {
+				ret = -ENOMEM;
+				goto error_put_trigger;
+			}
+			iio_trigger_set_drvdata(trig, trig_info);
+			trig_info->irq = irq;
+			trig->ops = &iio_interrupt_trigger_ops;
+			ret = request_irq(irq, iio_interrupt_trigger_poll,
+					  irqflags, trig->name, trig);
+			if (ret) {
+				dev_err(&pdev->dev,
+					"request IRQ-%d failed", irq);
+				goto error_free_trig_info;
+			}
+
+			ret = iio_trigger_register(trig);
+			if (ret)
+				goto error_release_irq;
+
+			list_add_tail(&trig->alloc_list,
+					&iio_interrupt_trigger_list);
+		}
+
+		irq_res_cnt++;
+	} while (irq_res != NULL);
+
+
+	return 0;
+
+/* First clean up the partly allocated trigger */
+error_release_irq:
+	free_irq(irq, trig);
+error_free_trig_info:
+	kfree(trig_info);
+error_put_trigger:
+	iio_trigger_put(trig);
+error_free_completed_registrations:
+	/* The rest should have been added to the iio_interrupt_trigger_list */
+	list_for_each_entry_safe(trig,
+				 trig2,
+				 &iio_interrupt_trigger_list,
+				 alloc_list) {
+		trig_info = iio_trigger_get_drvdata(trig);
+		free_irq(trig_info->irq, trig);
+		kfree(trig_info);
+		iio_trigger_unregister(trig);
+	}
+
+	return ret;
+}
+
+static int iio_interrupt_trigger_remove(struct platform_device *pdev)
+{
+	struct iio_trigger *trig, *trig2;
+	struct iio_interrupt_trigger_info *trig_info;
+
+	mutex_lock(&iio_interrupt_trigger_list_lock);
+	list_for_each_entry_safe(trig,
+				 trig2,
+				 &iio_interrupt_trigger_list,
+				 alloc_list) {
+		trig_info = iio_trigger_get_drvdata(trig);
+		iio_trigger_unregister(trig);
+		free_irq(trig_info->irq, trig);
+		kfree(trig_info);
+		iio_trigger_put(trig);
+	}
+	mutex_unlock(&iio_interrupt_trigger_list_lock);
+
+	return 0;
+}
+
+static struct platform_driver iio_interrupt_trigger_driver = {
+	.probe = iio_interrupt_trigger_probe,
+	.remove = iio_interrupt_trigger_remove,
+	.driver = {
+		.name = "iio_interrupt_trigger",
+		.owner = THIS_MODULE,
+	},
+};
+
+module_platform_driver(iio_interrupt_trigger_driver);
+
+MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
+MODULE_DESCRIPTION("Interrupt trigger for the iio subsystem");
+MODULE_LICENSE("GPL v2");