ramoops: use the platform data structure instead of module params

As each board and system has different memory for ramoops. It's better to
define the platform data instead of module params.

[[e-mail]: fix ramoops_remove() return type]
Signed-off-by: Kyungmin Park <[e-mail]>
Cc: Marco Stornelli <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/char/ramoops.c

···
 #include <linux/time.h>
 #include <linux/io.h>
 #include <linux/ioport.h>
+#include <linux/platform_device.h>
+#include <linux/ramoops.h>
 
 #define RAMOOPS_KERNMSG_HDR "===="
 #define RAMOOPS_HEADER_SIZE   (5 + sizeof(struct timeval))
···
 	cxt->count = (cxt->count + 1) % cxt->max_count;
 }
 
-static int __init ramoops_init(void)
+static int __init ramoops_probe(struct platform_device *pdev)
 {
+	struct ramoops_platform_data *pdata = pdev->dev.platform_data;
 	struct ramoops_context *cxt = &oops_cxt;
 	int err = -EINVAL;
+
+	if (pdata) {
+		mem_size = pdata->mem_size;
+		mem_address = pdata->mem_address;
+	}
 
 	if (!mem_size) {
 		printk(KERN_ERR "ramoops: invalid size specification");
···
 	return err;
 }
 
-static void __exit ramoops_exit(void)
+static int __exit ramoops_remove(struct platform_device *pdev)
 {
 	struct ramoops_context *cxt = &oops_cxt;
 
···
 
 	iounmap(cxt->virt_addr);
 	release_mem_region(cxt->phys_addr, cxt->size);
+	return 0;
 }
 
+static struct platform_driver ramoops_driver = {
+	.remove		= __exit_p(ramoops_remove),
+	.driver		= {
+		.name	= "ramoops",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init ramoops_init(void)
+{
+	return platform_driver_probe(&ramoops_driver, ramoops_probe);
+}
+
+static void __exit ramoops_exit(void)
+{
+	platform_driver_unregister(&ramoops_driver);
+}
 
 module_init(ramoops_init);
 module_exit(ramoops_exit);

include/linux/ramoops.h

···
+#ifndef __RAMOOPS_H
+#define __RAMOOPS_H
+
+/*
+ * Ramoops platform data
+ * @mem_size	memory size for ramoops
+ * @mem_address	physical memory address to contain ramoops
+ */
+
+struct ramoops_platform_data {
+	unsigned long	mem_size;
+	unsigned long	mem_address;
+};
+
+#endif