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#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 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 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");
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