[PATCH 1/2] uio/pdrv_genirq: Refactor probe routine to expose a generic part

[Wolfram Sang <w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>]

This patch refactors the probe routine, so that an of-version of a similiar
driver can pick it up later.

Signed-off-by: Wolfram Sang <w.sang-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
Cc: Magnus Damm <magnus.damm-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Hans J. Koch <hjk-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
Cc: Greg KH <gregkh-l3A5Bk7waGM@public.gmane.org>
---
 drivers/uio/uio_pdrv_genirq.c   |   60 ++++++++++++++++++++------------------
 include/linux/uio_pdrv_genirq.h |   13 ++++++++
 2 files changed, 45 insertions(+), 28 deletions(-)
 create mode 100644 include/linux/uio_pdrv_genirq.h

diff --git a/drivers/uio/uio_pdrv_genirq.c b/drivers/uio/uio_pdrv_genirq.c
index 3f06818..8f8a0f9 100644
--- a/drivers/uio/uio_pdrv_genirq.c
+++ b/drivers/uio/uio_pdrv_genirq.c
@@ -20,15 +20,10 @@
 #include <linux/bitops.h>
 #include <linux/interrupt.h>
 #include <linux/stringify.h>
+#include <linux/uio_pdrv_genirq.h>
 
 #define DRIVER_NAME "uio_pdrv_genirq"
 
-struct uio_pdrv_genirq_platdata {
-	struct uio_info *uioinfo;
-	spinlock_t lock;
-	unsigned long flags;
-};
-
 static irqreturn_t uio_pdrv_genirq_handler(int irq, struct uio_info *dev_info)
 {
 	struct uio_pdrv_genirq_platdata *priv = dev_info->priv;
@@ -68,29 +63,18 @@ static int uio_pdrv_genirq_irqcontrol(struct uio_info *dev_info, s32 irq_on)
 	return 0;
 }
 
-static int uio_pdrv_genirq_probe(struct platform_device *pdev)
+int __uio_pdrv_genirq_probe(struct device *dev, struct uio_info *uioinfo,
+		struct resource *resources, unsigned int num_resources)
 {
-	struct uio_info *uioinfo = pdev->dev.platform_data;
 	struct uio_pdrv_genirq_platdata *priv;
 	struct uio_mem *uiomem;
-	int ret = -EINVAL;
-	int i;
-
-	if (!uioinfo || !uioinfo->name || !uioinfo->version) {
-		dev_err(&pdev->dev, "missing platform_data\n");
-		goto bad0;
-	}
-
-	if (uioinfo->handler || uioinfo->irqcontrol ||
-	    uioinfo->irq_flags & IRQF_SHARED) {
-		dev_err(&pdev->dev, "interrupt configuration error\n");
-		goto bad0;
-	}
+	unsigned int i;
+	int ret;
 
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv) {
 		ret = -ENOMEM;
-		dev_err(&pdev->dev, "unable to kmalloc\n");
+		dev_err(dev, "unable to kmalloc\n");
 		goto bad0;
 	}
 
@@ -100,14 +84,14 @@ static int uio_pdrv_genirq_probe(struct platform_device *pdev)
 
 	uiomem = &uioinfo->mem[0];
 
-	for (i = 0; i < pdev->num_resources; ++i) {
-		struct resource *r = &pdev->resource[i];
+	for (i = 0; i < num_resources; ++i) {
+		struct resource *r = resources + i;
 
 		if (r->flags != IORESOURCE_MEM)
 			continue;
 
 		if (uiomem >= &uioinfo->mem[MAX_UIO_MAPS]) {
-			dev_warn(&pdev->dev, "device has more than "
+			dev_warn(dev, "device has more than "
 					__stringify(MAX_UIO_MAPS)
 					" I/O memory resources.\n");
 			break;
@@ -138,19 +122,39 @@ static int uio_pdrv_genirq_probe(struct platform_device *pdev)
 	uioinfo->irqcontrol = uio_pdrv_genirq_irqcontrol;
 	uioinfo->priv = priv;
 
-	ret = uio_register_device(&pdev->dev, priv->uioinfo);
+	ret = uio_register_device(dev, priv->uioinfo);
 	if (ret) {
-		dev_err(&pdev->dev, "unable to register uio device\n");
+		dev_err(dev, "unable to register uio device\n");
 		goto bad1;
 	}
 
-	platform_set_drvdata(pdev, priv);
+	dev_set_drvdata(dev, priv);
 	return 0;
  bad1:
 	kfree(priv);
  bad0:
 	return ret;
 }
+EXPORT_SYMBOL_GPL(__uio_pdrv_genirq_probe);
+
+static int uio_pdrv_genirq_probe(struct platform_device *pdev)
+{
+	struct uio_info *uioinfo = pdev->dev.platform_data;
+
+	if (!uioinfo || !uioinfo->name || !uioinfo->version) {
+		dev_err(&pdev->dev, "missing platform_data\n");
+		return -EINVAL;
+	}
+
+	if (uioinfo->handler || uioinfo->irqcontrol ||
+	    uioinfo->irq_flags & IRQF_SHARED) {
+		dev_err(&pdev->dev, "interrupt configuration error\n");
+		return -EINVAL;
+	}
+
+	return __uio_pdrv_genirq_probe(&pdev->dev, uioinfo, pdev->resource,
+			pdev->num_resources);
+}
 
 static int uio_pdrv_genirq_remove(struct platform_device *pdev)
 {
diff --git a/include/linux/uio_pdrv_genirq.h b/include/linux/uio_pdrv_genirq.h
new file mode 100644
index 0000000..a410390
--- /dev/null
+++ b/include/linux/uio_pdrv_genirq.h
@@ -0,0 +1,13 @@
+#ifndef _LINUX_UIO_PDRV_GENIRQ_H
+#define _LINUX_UIO_PDRV_GENIRQ_H
+
+struct uio_pdrv_genirq_platdata {
+	struct uio_info *uioinfo;
+	spinlock_t lock;
+	unsigned long flags;
+};
+
+extern int __uio_pdrv_genirq_probe(struct device *dev, struct uio_info *uioinfo,
+	struct resource *resources, unsigned int num_resources);
+
+#endif
-- 
1.6.3.1