From b47aef28536f3c276d232c41cd3084c69389dca4 Mon Sep 17 00:00:00 2001
From: Tomi Valkeinen <tomi.valkeinen@nokia.com>
Date: Wed, 22 Apr 2009 14:11:52 +0300
Subject: [PATCH] DSS2: VRAM: use debugfs, not procfs

---
 arch/arm/plat-omap/vram.c |  103 +++++++++++++++------------------------------
 1 files changed, 34 insertions(+), 69 deletions(-)

diff --git a/arch/arm/plat-omap/vram.c b/arch/arm/plat-omap/vram.c
index 90276ac..e847579 100644
--- a/arch/arm/plat-omap/vram.c
+++ b/arch/arm/plat-omap/vram.c
@@ -27,11 +27,11 @@
 #include <linux/mm.h>
 #include <linux/list.h>
 #include <linux/dma-mapping.h>
-#include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/bootmem.h>
 #include <linux/omapfb.h>
 #include <linux/completion.h>
+#include <linux/debugfs.h>
 
 #include <asm/setup.h>
 
@@ -398,88 +398,54 @@ int omap_vram_alloc(int mtype, size_t size, unsigned long *paddr)
 }
 EXPORT_SYMBOL(omap_vram_alloc);
 
-#ifdef CONFIG_PROC_FS
-static void *r_next(struct seq_file *m, void *v, loff_t *pos)
-{
-	struct list_head *l = v;
-
-	(*pos)++;
-
-	if (list_is_last(l, &region_list))
-		return NULL;
-
-	return l->next;
-}
-
-static void *r_start(struct seq_file *m, loff_t *pos)
-{
-	loff_t p = *pos;
-	struct list_head *l = &region_list;
-
-	mutex_lock(&region_mutex);
-
-	do {
-		l = l->next;
-		if (l == &region_list)
-			return NULL;
-	} while (p--);
-
-	return l;
-}
-
-static void r_stop(struct seq_file *m, void *v)
-{
-	mutex_unlock(&region_mutex);
-}
-
-static int r_show(struct seq_file *m, void *v)
+#if defined(CONFIG_DEBUG_FS)
+static int vram_debug_show(struct seq_file *s, void *unused)
 {
 	struct vram_region *vr;
 	struct vram_alloc *va;
 	unsigned size;
 
-	vr = list_entry(v, struct vram_region, list);
-
-	size = vr->pages << PAGE_SHIFT;
-
-	seq_printf(m, "%08lx-%08lx (%d bytes)\n",
-			vr->paddr, vr->paddr + size - 1,
-			size);
+	mutex_lock(&region_mutex);
 
-	list_for_each_entry(va, &vr->alloc_list, list) {
-		size = va->pages << PAGE_SHIFT;
-		seq_printf(m, "    %08lx-%08lx (%d bytes)\n",
-				va->paddr, va->paddr + size - 1,
+	list_for_each_entry(vr, &region_list, list) {
+		size = vr->pages << PAGE_SHIFT;
+		seq_printf(s, "%08lx-%08lx (%d bytes)\n",
+				vr->paddr, vr->paddr + size - 1,
 				size);
-	}
 
+		list_for_each_entry(va, &vr->alloc_list, list) {
+			size = va->pages << PAGE_SHIFT;
+			seq_printf(s, "    %08lx-%08lx (%d bytes)\n",
+					va->paddr, va->paddr + size - 1,
+					size);
+		}
+	}
 
+	mutex_unlock(&region_mutex);
 
 	return 0;
 }
 
-static const struct seq_operations resource_op = {
-	.start	= r_start,
-	.next	= r_next,
-	.stop	= r_stop,
-	.show	= r_show,
-};
-
-static int vram_open(struct inode *inode, struct file *file)
+static int vram_debug_open(struct inode *inode, struct file *file)
 {
-	return seq_open(file, &resource_op);
+	return single_open(file, vram_debug_show, inode->i_private);
 }
 
-static const struct file_operations proc_vram_operations = {
-	.open		= vram_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= seq_release,
+static const struct file_operations vram_debug_fops = {
+	.open           = vram_debug_open,
+	.read           = seq_read,
+	.llseek         = seq_lseek,
+	.release        = single_release,
 };
 
-static int __init omap_vram_create_proc(void)
+static int __init omap_vram_create_debugfs(void)
 {
-	proc_create("omap-vram", 0, NULL, &proc_vram_operations);
+	struct dentry *d;
+
+	d = debugfs_create_file("vram", S_IRUGO, NULL,
+			NULL, &vram_debug_fops);
+	if (IS_ERR(d))
+		return PTR_ERR(d);
 
 	return 0;
 }
@@ -487,7 +453,7 @@ static int __init omap_vram_create_proc(void)
 
 static __init int omap_vram_init(void)
 {
-	int i, r;
+	int i;
 
 	vram_initialized = 1;
 
@@ -495,10 +461,9 @@ static __init int omap_vram_init(void)
 		omap_vram_add_region(postponed_regions[i].paddr,
 				postponed_regions[i].size);
 
-#ifdef CONFIG_PROC_FS
-	r = omap_vram_create_proc();
-	if (r)
-		return -ENOMEM;
+#ifdef CONFIG_DEBUG_FS
+	if (omap_vram_create_debugfs())
+		pr_err("VRAM: Failed to create debugfs file\n");
 #endif
 
 	return 0;
-- 
1.5.6.5