Platform device added

1 files changed, 105 insertions, 0 deletions

diff --git a/kernel-devel/module-basics/vain_plat/vain_plat_orig.c b/kernel-devel/module-basics/vain_plat/vain_plat_orig.c
new file mode 100644
index 0000000..530407e
--- /dev/null
+++ b/kernel-devel/module-basics/vain_plat/vain_plat_orig.c
@@ -0,0 +1,105 @@
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+
+struct vain_plat_info {
+	void __iomem *base;
+	struct platform_device *pdev;
+	spinlock_t lock;
+};
+
+static int __devinit vain_plat_probe(struct platform_device *pdev)
+{
+	struct vain_plat_info *info;
+	struct resource *res, *mem;
+	int err;
+
+	info = kzalloc(sizeof(struct vain_plat_info), GFP_KERNEL);
+	if (unlikely(!info)) {
+		dev_err(&pdev->dev, "Could not allocate memory\n");
+		err = -ENOMEM;
+		goto out;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (unlikely(!res)) {
+		dev_err(&pdev->dev, "I/O address already in use\n");
+		err = -ENOENT;
+		goto err_free;
+	}
+
+	mem = request_mem_region(res->start, resource_size(res), pdev->name);
+	if (!mem) {
+		err = -EBUSY;
+		goto err_free;
+	}
+
+	info->base = ioremap(res->start, resource_size(res));
+	if (!info->base) {
+		dev_err(&pdev->dev, "Unable to map card MMIO\n");
+		err = -ENODEV;
+		goto err_ioremap;
+	}
+
+	platform_set_drvdata(pdev, info);
+
+	return 0;
+
+err_ioremap:
+	release_mem_region(res->start, resource_size(res));
+err_free:
+	kfree(info);
+out:
+	return err;
+}
+
+static int __devexit vain_plat_remove(struct platform_device *pdev)
+{
+	struct vain_plat_info *info = platform_get_drvdata(pdev);
+	struct resource *res;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	iounmap(info->base);
+	release_mem_region(res->start, resource_size(res));
+	platform_set_drvdata(pdev, NULL);
+
+	kfree (info);
+
+	return 0;
+}
+
+static struct platform_driver vain_plat_driver = {
+	.driver		= {
+		.name	= "vain_plat",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= vain_plat_probe,
+	.remove		= __devexit_p(vain_plat_remove),
+};
+
+static int __init vain_plat_init(void)
+{
+	int err;
+
+	err = platform_driver_register(&vain_plat_driver);
+
+	if (!err)
+		printk(KERN_INFO "vain_plat_init: done\n");
+	return err;
+}
+
+static void __exit vain_plat_exit(void)
+{
+	platform_driver_unregister(&vain_plat_driver);
+	printk(KERN_INFO "vain_plat_exit: done\n");
+}
+
+module_init(vain_plat_init);
+module_exit(vain_plat_exit);
+
+MODULE_AUTHOR("Benedikt Spranger <b.spranger@linutronix.de>");
+MODULE_DESCRIPTION("a more or less useless platform module");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION("0815");