From 27760f868663310ff9e701f47aec33da3b906f34 Mon Sep 17 00:00:00 2001
From: "Hans J. Koch" <hjk@hansjkoch.de>
Date: Thu, 7 Jul 2011 23:11:38 +0200
Subject: [PATCH] uio: uio_pdrv_genirq: Add OF support

Adding OF binding to genirq.
Version string is setup to the "devicetree".

Compatible string is not setup for now but you can add your
custom compatible string to uio_of_genirq_match structure.

For example with "vendor,device" compatible string:
static const struct of_device_id __devinitconst uio_of_genirq_match[] = {
	{ .compatible = "vendor,device", },
	{ /* empty for now */ },
};

Signed-off-by: Michal Simek <monstr@monstr.eu>
Signed-off-by: Hans J. Koch <hjk@hansjkoch.de>
Reviewed-by: Wolfram Sang <w.sang@pengutronix.de>
CC: Hans J. Koch <hjk@hansjkoch.de>
CC: Arnd Bergmann <arnd@arndb.de>
CC: John Williams <john.williams@petalogix.com>
CC: Grant Likely <grant.likely@secretlab.ca>
CC: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
 drivers/uio/uio_pdrv_genirq.c | 43 +++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/uio/uio_pdrv_genirq.c b/drivers/uio/uio_pdrv_genirq.c
index 0f424af7f109..f8f81db32159 100644
--- a/drivers/uio/uio_pdrv_genirq.c
+++ b/drivers/uio/uio_pdrv_genirq.c
@@ -23,6 +23,10 @@
 #include <linux/pm_runtime.h>
 #include <linux/slab.h>
 
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_address.h>
+
 #define DRIVER_NAME "uio_pdrv_genirq"
 
 struct uio_pdrv_genirq_platdata {
@@ -97,6 +101,27 @@ static int uio_pdrv_genirq_probe(struct platform_device *pdev)
 	int ret = -EINVAL;
 	int i;
 
+	if (!uioinfo) {
+		int irq;
+
+		/* alloc uioinfo for one device */
+		uioinfo = kzalloc(sizeof(*uioinfo), GFP_KERNEL);
+		if (!uioinfo) {
+			ret = -ENOMEM;
+			dev_err(&pdev->dev, "unable to kmalloc\n");
+			goto bad2;
+		}
+		uioinfo->name = pdev->dev.of_node->name;
+		uioinfo->version = "devicetree";
+
+		/* Multiple IRQs are not supported */
+		irq = platform_get_irq(pdev, 0);
+		if (irq == -ENXIO)
+			uioinfo->irq = UIO_IRQ_NONE;
+		else
+			uioinfo->irq = irq;
+	}
+
 	if (!uioinfo || !uioinfo->name || !uioinfo->version) {
 		dev_err(&pdev->dev, "missing platform_data\n");
 		goto bad0;
@@ -180,6 +205,10 @@ static int uio_pdrv_genirq_probe(struct platform_device *pdev)
 	kfree(priv);
 	pm_runtime_disable(&pdev->dev);
  bad0:
+	/* kfree uioinfo for OF */
+	if (pdev->dev.of_node)
+		kfree(uioinfo);
+ bad2:
 	return ret;
 }
 
@@ -193,6 +222,10 @@ static int uio_pdrv_genirq_remove(struct platform_device *pdev)
 	priv->uioinfo->handler = NULL;
 	priv->uioinfo->irqcontrol = NULL;
 
+	/* kfree uioinfo for OF */
+	if (pdev->dev.of_node)
+		kfree(priv->uioinfo);
+
 	kfree(priv);
 	return 0;
 }
@@ -219,6 +252,15 @@ static const struct dev_pm_ops uio_pdrv_genirq_dev_pm_ops = {
 	.runtime_resume = uio_pdrv_genirq_runtime_nop,
 };
 
+#ifdef CONFIG_OF
+static const struct of_device_id __devinitconst uio_of_genirq_match[] = {
+	{ /* empty for now */ },
+};
+MODULE_DEVICE_TABLE(of, uio_of_genirq_match);
+#else
+# define uio_of_genirq_match NULL
+#endif
+
 static struct platform_driver uio_pdrv_genirq = {
 	.probe = uio_pdrv_genirq_probe,
 	.remove = uio_pdrv_genirq_remove,
@@ -226,6 +268,7 @@ static struct platform_driver uio_pdrv_genirq = {
 		.name = DRIVER_NAME,
 		.owner = THIS_MODULE,
 		.pm = &uio_pdrv_genirq_dev_pm_ops,
+		.of_match_table = uio_of_genirq_match,
 	},
 };