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.

[akpm@linux-foundation.org: fix ramoops_remove() return type]
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Marco Stornelli <marco.stornelli@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 43 insertions, 2 deletions

diff --git a/drivers/char/ramoops.c b/drivers/char/ramoops.c
index 74f00b5ffa36..73dcb0ee41fd 100644
--- a/drivers/char/ramoops.c
+++ b/drivers/char/ramoops.c
@@ -25,6 +25,8 @@
 #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))
@@ -91,11 +93,17 @@ static void ramoops_do_dump(struct kmsg_dumper *dumper,
         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");
                 goto fail3;
@@ -142,7 +150,7 @@ fail3:
         return err;
 }
 
-static void __exit ramoops_exit(void)
+static int __exit ramoops_remove(struct platform_device *pdev)
 {
         struct ramoops_context *cxt = &oops_cxt;
 
@@ -151,8 +159,26 @@ static void __exit ramoops_exit(void)
 
         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);
diff --git a/include/linux/ramoops.h b/include/linux/ramoops.h
new file mode 100644
index 000000000000..0ae68a2c1212
--- /dev/null
+++ b/include/linux/ramoops.h
@@ -0,0 +1,15 @@
+#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