linux-kernel - [PATCH] Ramoops: use the platform data structure instead of module params

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Date:	Wed, 18 Aug 2010 17:33:46 +0900
From:	Kyungmin Park <kmpark@...radead.org>
To:	linux-kernel@...r.kernel.org,
	Marco Stornelli <marco.stornelli@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] Ramoops: use the platform data structure instead of module
	params

From: Kyungmin Park <kyungmin.park@...sung.com>

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

Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
diff --git a/drivers/char/ramoops.c b/drivers/char/ramoops.c
index 74f00b5..eb7faba 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 void __exit ramoops_remove(void)
 {
 	struct ramoops_context *cxt = &oops_cxt;
 
@@ -153,6 +161,23 @@ static void __exit ramoops_exit(void)
 	release_mem_region(cxt->phys_addr, cxt->size);
 }
 
+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 0000000..0ae68a2
--- /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
--
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