patch-2.4.0-test3 linux/drivers/mtd/mtdcore.c

• Lines: 400
• Date: Thu Jul 6 01:22:24 2000
• Orig file: v2.4.0-test2/linux/drivers/mtd/mtdcore.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test2/linux/drivers/mtd/mtdcore.c linux/drivers/mtd/mtdcore.c
@@ -0,0 +1,399 @@
+/*
+ * $Id: mtdcore.c,v 1.8 2000/06/27 13:40:05 dwmw2 Exp $
+ *
+ * Core registration and callback routines for MTD 
+ * drivers and users.
+ *
+ */
+
+#ifdef MTD_DEBUG
+#define DEBUGLVL debug
+#endif
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/ptrace.h>
+#include <linux/malloc.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/major.h>
+#include <linux/fs.h>
+#include <linux/ioctl.h>
+#include <stdarg.h>
+#include <linux/mtd/compatmac.h>
+#ifdef CONFIG_PROC_FS
+#include <linux/proc_fs.h>
+#endif
+
+#include <linux/mtd/mtd.h>
+
+#ifdef MTD_DEBUG
+static int debug = MTD_DEBUG;
+MODULE_PARM(debug, "i");
+#endif
+
+/* Init code required for 2.2 kernels */
+
+#if LINUX_VERSION_CODE < 0x20300
+
+#ifdef CONFIG_MTD_DOC1000
+extern int init_doc1000(void);
+#endif
+#ifdef CONFIG_MTD_DOCPROBE
+extern int init_doc(void);
+#endif
+#ifdef CONFIG_MTD_OCTAGON
+extern int init_octagon5066(void);
+#endif
+#ifdef CONFIG_MTD_VMAX
+extern int init_vmax301(void);
+#endif
+#ifdef CONFIG_MTD_MIXMEM
+extern int init_mixmem(void);
+#endif
+#ifdef CONFIG_MTD_PMC551
+extern int init_pmc551(void);
+#endif
+#ifdef CONFIG_MTD_NORA
+extern int init_nora(void);
+#endif
+#ifdef CONFIG_FTL
+extern int init_ftl(void);
+#endif
+#ifdef CONFIG_NFTL
+extern int init_nftl(void);
+#endif
+#ifdef CONFIG_MTD_BLOCK
+extern int init_mtdblock(void);
+#endif
+#ifdef CONFIG_MTD_CHAR
+extern int init_mtdchar(void);
+#endif
+
+#endif /* LINUX_VERSION_CODE < 0x20300 */
+
+
+static DECLARE_MUTEX(mtd_table_mutex);
+
+static struct mtd_info *mtd_table[MAX_MTD_DEVICES];
+
+static struct mtd_notifier *mtd_notifiers = NULL;
+
+
+int add_mtd_device(struct mtd_info *mtd)
+{
+	int i;
+
+	down(&mtd_table_mutex);
+
+	for (i=0; i< MAX_MTD_DEVICES; i++)
+		if (!mtd_table[i])
+		{
+			struct mtd_notifier *not=mtd_notifiers;
+
+			mtd_table[i] = mtd;
+			DEBUG(0, "mtd: Giving out device %d to %s\n",i, mtd->name);
+			while (not)
+			{
+				(*(not->add))(mtd);
+				not = not->next;
+			}
+			up(&mtd_table_mutex);
+			MOD_INC_USE_COUNT;
+			return 0;
+		}
+	
+	up(&mtd_table_mutex);
+	return 1;
+}
+
+
+int del_mtd_device (struct mtd_info *mtd)
+{
+	struct mtd_notifier *not=mtd_notifiers;
+	int i;
+	
+	down(&mtd_table_mutex);
+
+	for (i=0; i < MAX_MTD_DEVICES; i++)
+	{
+		if (mtd_table[i] == mtd)
+		{
+			while (not)
+			{
+				(*(not->remove))(mtd);
+				not = not->next;
+			}
+			mtd_table[i] = NULL;
+			up (&mtd_table_mutex);
+			MOD_DEC_USE_COUNT;
+			return 0;
+		}
+	}
+
+	up(&mtd_table_mutex);
+	return 1;
+}
+
+
+
+void register_mtd_user (struct mtd_notifier *new)
+{
+	int i;
+
+	down(&mtd_table_mutex);
+
+	new->next = mtd_notifiers;
+	mtd_notifiers = new;
+
+ 	MOD_INC_USE_COUNT;
+	
+	for (i=0; i< MAX_MTD_DEVICES; i++)
+		if (mtd_table[i])
+			new->add(mtd_table[i]);
+
+	up(&mtd_table_mutex);
+}
+
+
+
+int unregister_mtd_user (struct mtd_notifier *old)
+{
+	struct mtd_notifier **prev = &mtd_notifiers;
+	struct mtd_notifier *cur;
+	int i;
+
+	down(&mtd_table_mutex);
+
+	while ((cur = *prev)) {
+		if (cur == old) {
+			*prev = cur->next;
+
+			MOD_DEC_USE_COUNT;
+
+			for (i=0; i< MAX_MTD_DEVICES; i++)
+				if (mtd_table[i])
+					old->remove(mtd_table[i]);
+			
+			up(&mtd_table_mutex);
+			return 0;
+		}
+		prev = &cur->next;
+	}
+	up(&mtd_table_mutex);
+	return 1;
+}
+
+
+/* get_mtd_device(): 
+ * Prepare to use an MTD device referenced either by number or address.
+ *
+ * If <num> == -1, search the table for an MTD device located at <mtd>.
+ * If <mtd> == NULL, return the MTD device with number <num>.
+ * If both are set, return the MTD device with number <num> _only_ if it
+ *     is located at <mtd>.
+ */
+	
+struct mtd_info *__get_mtd_device(struct mtd_info *mtd, int num)
+{
+	struct mtd_info *ret = NULL;
+	int i;
+
+	down(&mtd_table_mutex);
+
+	if (num == -1) {
+		for (i=0; i< MAX_MTD_DEVICES; i++)
+			if (mtd_table[i] == mtd)
+				ret = mtd_table[i];
+	} else if (num < MAX_MTD_DEVICES) {
+		ret = mtd_table[num];
+		if (mtd && mtd != ret)
+			ret = NULL;
+	}
+	
+	up(&mtd_table_mutex);
+	return ret;
+}
+
+EXPORT_SYMBOL(add_mtd_device);
+EXPORT_SYMBOL(del_mtd_device);
+EXPORT_SYMBOL(__get_mtd_device);
+EXPORT_SYMBOL(register_mtd_user);
+EXPORT_SYMBOL(unregister_mtd_user);
+
+/*====================================================================*/
+/* /proc/mtd support */
+
+#ifdef CONFIG_PROC_FS
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
+struct proc_dir_entry *proc_mtd;
+#endif
+
+static inline int mtd_proc_info (char *buf, int i)
+{
+	struct mtd_info *this = mtd_table[i];
+
+	if (!this) 
+		return 0;
+
+	return sprintf(buf, "mtd%d: %8.8lx \"%s\"\n", i, this->size, 
+		       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
+#else
+                        ,int unused
+#endif
+			)
+{
+	int len = 0, l, i;
+        off_t   begin = 0;
+      
+	down(&mtd_table_mutex);
+
+        for (i=0; i< MAX_MTD_DEVICES; i++) {
+
+                l = mtd_proc_info(page + len, i);
+                len += l;
+                if (len+begin > off+count)
+                        goto done;
+                if (len+begin < off) {
+                        begin += len;
+                        len = 0;
+                }
+        }
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
+        *eof = 1;
+#endif
+
+done:
+	up(&mtd_table_mutex);
+        if (off >= len+begin)
+                return 0;
+        *start = page + (begin-off);
+        return ((count < begin+len-off) ? count : begin+len-off);
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,2,0)
+struct proc_dir_entry mtd_proc_entry = {
+        0,                 /* low_ino: the inode -- dynamic */
+        3, "mtd",     /* len of name and name */
+        S_IFREG | S_IRUGO, /* mode */
+        1, 0, 0,           /* nlinks, owner, group */
+        0, NULL,           /* size - unused; operations -- use default */
+        &mtd_read_proc,   /* function used to read data */
+        /* nothing more */
+    };
+#endif
+
+#endif
+
+/*====================================================================*/
+
+
+#if LINUX_VERSION_CODE < 0x20300
+
+static inline  void init_others(void) 
+{
+	/* Shedloads of calls to init functions of all the
+	 * other drivers and users of MTD, which we can
+	 * ditch in 2.3 because of the sexy new way of 
+	 * finding init routines.
+	 */
+#ifdef CONFIG_MTD_DOC1000
+	init_doc1000();
+#endif
+#ifdef CONFIG_MTD_DOCPROBE
+	init_doc(); /* This covers both the DiskOnChip 2000 
+		     * and the DiskOnChip Millennium. 
+		     * Theoretically all other DiskOnChip
+		     * devices too. */
+#endif
+#ifdef CONFIG_MTD_OCTAGON
+	init_octagon5066();
+#endif
+#ifdef CONFIG_MTD_VMAX
+	init_vmax301();
+#endif
+#ifdef CONFIGF_MTD_MIXMEM
+	init_mixmem();
+#endif
+#ifdef CONFIG_MTD_PMC551
+	init_pmc551();
+#endif
+#ifdef CONFIG_MTD_NORA
+	init_nora();
+#endif
+#ifdef CONFIG_MTD_MTDRAM
+	init_mtdram();
+#endif
+#ifdef CONFIG_FTL
+	init_ftl();
+#endif
+#ifdef CONFIG_NFTL
+	init_nftl();
+#endif
+#ifdef CONFIG_MTD_BLOCK
+	init_mtdblock();
+#endif
+#ifdef CONFIG_MTD_CHAR
+	init_mtdchar();
+#endif
+}
+
+#ifdef MODULE
+#define init_mtd init_module
+#define cleanup_mtd cleanup_module
+#endif
+
+#endif /* LINUX_VERSION_CODE < 0x20300 */
+
+mod_init_t init_mtd(void)
+{
+	int i;
+	DEBUG(1, "INIT_MTD:\n");	
+	for (i=0; i<MAX_MTD_DEVICES; i++)
+		mtd_table[i]=NULL;
+
+#ifdef CONFIG_PROC_FS
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
+	if ((proc_mtd = create_proc_entry( "mtd", 0, 0 )))
+	  proc_mtd->read_proc = mtd_read_proc;
+#else
+        proc_register_dynamic(&proc_root,&mtd_proc_entry);
+#endif
+
+#endif
+
+#if LINUX_VERSION_CODE < 0x20300
+	init_others();
+#endif
+
+	return 0;
+}
+
+mod_exit_t cleanup_mtd(void)
+{
+	unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
+#ifdef CONFIG_PROC_FS
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
+        if (proc_mtd)
+          remove_proc_entry( "mtd", 0);
+#else
+        proc_unregister(&proc_root,mtd_proc_entry.low_ino);
+#endif
+#endif
+}
+      
+#if LINUX_VERSION_CODE > 0x20300
+module_init(init_mtd);
+module_exit(cleanup_mtd);
+#endif
+
+