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path: root/recipes/linux/linux-mtx-2-2.4.27/11-mtd-proc-partition-rw.diff
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diff -Nurb linux/drivers/mtd/mtdcore.c linux-mtd-rw/drivers/mtd/mtdcore.c
--- linux/drivers/mtd/mtdcore.c	2004-11-18 13:16:00.000000000 +0100
+++ linux-mtd-rw/drivers/mtd/mtdcore.c	2004-11-18 15:27:13.130036616 +0100
@@ -25,6 +25,10 @@
 
 #include <linux/mtd/mtd.h>
 
+/* this symbol is exported by the procfs. */
+extern struct proc_dir_entry *proc_sys_root;
+
+
 /* These are exported solely for the purpose of mtd_blkdevs.c. You 
    should not use them for _anything_ else */
 DECLARE_MUTEX(mtd_table_mutex);
@@ -336,8 +340,83 @@
 
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
 static struct proc_dir_entry *proc_mtd;
+
+static struct proc_dir_entry *proc_sys_mtd;
+static struct proc_dir_entry *proc_sys_mtd_partition[MAX_MTD_DEVICES];
+static struct proc_dir_entry *proc_sys_mtd_partition_rw[MAX_MTD_DEVICES];
 #endif
 
+/*===================================0
+ * mtdproc_read_partition_access
+ */
+static int mtdproc_read_partition_access ( char *page, char **start, off_t off,int count,
+					   int *eof, void *data
+					   )
+{
+  int partid = (unsigned int)data;
+  int len = 0;
+
+  // NO RETURN FROM HERE UNTIL "up(&mtd_table_mutex)".
+  down(&mtd_table_mutex);
+
+  if (partid < MAX_MTD_DEVICES)
+  {
+    struct mtd_info *this = mtd_table[partid];
+    if (this)
+      {
+	page[len] = (this->flags & MTD_WRITEABLE) ? '1' : '0';
+	len++;
+      }
+  }
+  
+  up(&mtd_table_mutex);
+
+  if (off >= len)
+    return 0;
+  *start = page + off;
+  return ((count < len-off) ? count : len-off);
+}
+
+
+static int mtdproc_write_partition_access (struct file *file, const char *buffer,
+					   unsigned long count, void *data)
+{
+  int partid = (unsigned int)data;
+  int len = 0;
+
+  // NO RETURN FROM HERE UNTIL "up(&mtd_table_mutex)".
+  down(&mtd_table_mutex);
+
+  if (partid < MAX_MTD_DEVICES)
+  {
+    struct mtd_info *this = mtd_table[partid];
+    if (this && count > 0)
+      {
+	switch (*buffer)
+	  {
+	  case '0':
+	    this->flags &= ~(this->master_flags & MTD_WRITEABLE);
+	    break;
+
+	  case '1':
+	    this->flags |= ~(this->master_flags & MTD_WRITEABLE);
+	    break;
+
+	  default:
+	    break;
+	  }
+      }
+  }
+  
+  up(&mtd_table_mutex);
+
+  return count;
+}
+
+
+
+
+
 static inline int mtd_proc_info (char *buf, int i)
 {
 	struct mtd_info *this = mtd_table[i];
@@ -349,6 +428,7 @@
 		       this->erasesize, this->name);
 }
 
+
 static int mtd_read_proc ( char *page, char **start, off_t off,int count
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
                        ,int *eof, void *data_unused
@@ -404,12 +484,31 @@
 /*====================================================================*/
 /* Init code */
 
+
 int __init init_mtd(void)
 {
 #ifdef CONFIG_PROC_FS
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
+	int i;
+
 	if ((proc_mtd = create_proc_entry( "mtd", 0, 0 )))
 	  proc_mtd->read_proc = mtd_read_proc;
+
+	proc_sys_mtd = proc_mkdir("mtd", proc_sys_root);
+	for (i=0; i<MAX_MTD_DEVICES; i++)
+	  {
+	    char partname[10];
+	    sprintf (partname, "%d", i);
+
+	    proc_sys_mtd_partition[i] = proc_mkdir(partname, proc_sys_mtd);
+	    proc_sys_mtd_partition_rw[i] = create_proc_entry ("rw", S_IFREG | S_IRUGO, proc_sys_mtd_partition[i]);
+	    if (proc_sys_mtd_partition_rw[i])
+            {
+              proc_sys_mtd_partition_rw[i]->read_proc  = mtdproc_read_partition_access;
+	      proc_sys_mtd_partition_rw[i]->write_proc = mtdproc_write_partition_access;
+	      proc_sys_mtd_partition_rw[i]->data = (void *)i;
+            }
+	  }
 #else
         proc_register_dynamic(&proc_root,&mtd_proc_entry);
 #endif
@@ -425,6 +524,8 @@
 	return 0;
 }
 
+
+
 static void __exit cleanup_mtd(void)
 {
 #ifdef CONFIG_PM
diff -Nurb linux/drivers/mtd/mtdpart.c linux-mtd-rw/drivers/mtd/mtdpart.c
--- linux/drivers/mtd/mtdpart.c	2004-11-18 13:16:00.000000000 +0100
+++ linux-mtd-rw/drivers/mtd/mtdpart.c	2004-11-18 15:27:13.131036464 +0100
@@ -341,6 +341,9 @@
 		/* set up the MTD object for this partition */
 		slave->mtd.type = master->type;
 		slave->mtd.flags = master->flags & ~parts[i].mask_flags;
+		slave->mtd.master_flags = master->flags;
+		slave->mtd.mask_flags = parts[i].mask_flags;
+
 		slave->mtd.size = parts[i].size;
 		slave->mtd.oobblock = master->oobblock;
 		slave->mtd.oobsize = master->oobsize;
diff -Nurb linux/include/linux/mtd/mtd.h linux-mtd-rw/include/linux/mtd/mtd.h
--- linux/include/linux/mtd/mtd.h	2004-11-18 13:16:31.000000000 +0100
+++ linux-mtd-rw/include/linux/mtd/mtd.h	2004-11-18 15:27:13.000000000 +0100
@@ -232,6 +232,9 @@
 
 	struct module *owner;
 	int usecount;
+
+	u_int32_t master_flags;
+	u_int32_t mask_flags;
 };