Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 419 insertions, 0 deletions

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
new file mode 100644
index 000000000000..9c0315d1b1c4
--- /dev/null
+++ b/drivers/mtd/mtdcore.c
@@ -0,0 +1,419 @@
+/*
+ * $Id: mtdcore.c,v 1.44 2004/11/16 18:28:59 dwmw2 Exp $
+ *
+ * Core registration and callback routines for MTD
+ * drivers and users.
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/ptrace.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/major.h>
+#include <linux/fs.h>
+#include <linux/ioctl.h>
+#include <linux/init.h>
+#include <linux/mtd/compatmac.h>
+#ifdef CONFIG_PROC_FS
+#include <linux/proc_fs.h>
+#endif
+
+#include <linux/mtd/mtd.h>
+
+/* These are exported solely for the purpose of mtd_blkdevs.c. You 
+   should not use them for _anything_ else */
+DECLARE_MUTEX(mtd_table_mutex);
+struct mtd_info *mtd_table[MAX_MTD_DEVICES];
+
+EXPORT_SYMBOL_GPL(mtd_table_mutex);
+EXPORT_SYMBOL_GPL(mtd_table);
+
+static LIST_HEAD(mtd_notifiers);
+
+/**
+ *	add_mtd_device - register an MTD device
+ *	@mtd: pointer to new MTD device info structure
+ *
+ *	Add a device to the list of MTD devices present in the system, and
+ *	notify each currently active MTD 'user' of its arrival. Returns
+ *	zero on success or 1 on failure, which currently will only happen
+ *	if the number of present devices exceeds MAX_MTD_DEVICES (i.e. 16)
+ */
+
+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 list_head *this;
+
+			mtd_table[i] = mtd;
+			mtd->index = i;
+			mtd->usecount = 0;
+
+			DEBUG(0, "mtd: Giving out device %d to %s\n",i, mtd->name);
+			/* No need to get a refcount on the module containing
+			   the notifier, since we hold the mtd_table_mutex */
+			list_for_each(this, &mtd_notifiers) {
+				struct mtd_notifier *not = list_entry(this, struct mtd_notifier, list);
+				not->add(mtd);
+			}
+			
+			up(&mtd_table_mutex);
+			/* We _know_ we aren't being removed, because
+			   our caller is still holding us here. So none
+			   of this try_ nonsense, and no bitching about it
+			   either. :) */
+			__module_get(THIS_MODULE);
+			return 0;
+		}
+	
+	up(&mtd_table_mutex);
+	return 1;
+}
+
+/**
+ *	del_mtd_device - unregister an MTD device
+ *	@mtd: pointer to MTD device info structure
+ *
+ *	Remove a device from the list of MTD devices present in the system,
+ *	and notify each currently active MTD 'user' of its departure.
+ *	Returns zero on success or 1 on failure, which currently will happen
+ *	if the requested device does not appear to be present in the list.
+ */
+
+int del_mtd_device (struct mtd_info *mtd)
+{
+	int ret;
+	
+	down(&mtd_table_mutex);
+
+	if (mtd_table[mtd->index] != mtd) {
+		ret = -ENODEV;
+	} else if (mtd->usecount) {
+		printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n", 
+		       mtd->index, mtd->name, mtd->usecount);
+		ret = -EBUSY;
+	} else {
+		struct list_head *this;
+
+		/* No need to get a refcount on the module containing
+		   the notifier, since we hold the mtd_table_mutex */
+		list_for_each(this, &mtd_notifiers) {
+			struct mtd_notifier *not = list_entry(this, struct mtd_notifier, list);
+			not->remove(mtd);
+		}
+
+		mtd_table[mtd->index] = NULL;
+
+		module_put(THIS_MODULE);
+		ret = 0;
+	}
+
+	up(&mtd_table_mutex);
+	return ret;
+}
+
+/**
+ *	register_mtd_user - register a 'user' of MTD devices.
+ *	@new: pointer to notifier info structure
+ *
+ *	Registers a pair of callbacks function to be called upon addition
+ *	or removal of MTD devices. Causes the 'add' callback to be immediately
+ *	invoked for each MTD device currently present in the system.
+ */
+
+void register_mtd_user (struct mtd_notifier *new)
+{
+	int i;
+
+	down(&mtd_table_mutex);
+
+	list_add(&new->list, &mtd_notifiers);
+
+ 	__module_get(THIS_MODULE);
+	
+	for (i=0; i< MAX_MTD_DEVICES; i++)
+		if (mtd_table[i])
+			new->add(mtd_table[i]);
+
+	up(&mtd_table_mutex);
+}
+
+/**
+ *	register_mtd_user - unregister a 'user' of MTD devices.
+ *	@new: pointer to notifier info structure
+ *
+ *	Removes a callback function pair from the list of 'users' to be
+ *	notified upon addition or removal of MTD devices. Causes the
+ *	'remove' callback to be immediately invoked for each MTD device
+ *	currently present in the system.
+ */
+
+int unregister_mtd_user (struct mtd_notifier *old)
+{
+	int i;
+
+	down(&mtd_table_mutex);
+
+	module_put(THIS_MODULE);
+
+	for (i=0; i< MAX_MTD_DEVICES; i++)
+		if (mtd_table[i])
+			old->remove(mtd_table[i]);
+			
+	list_del(&old->list);
+	up(&mtd_table_mutex);
+	return 0;
+}
+
+
+/**
+ *	get_mtd_device - obtain a validated handle for an MTD device
+ *	@mtd: last known address of the required MTD device
+ *	@num: internal device number of the required MTD device
+ *
+ *	Given a number and NULL address, return the num'th entry in the device
+ *	table, if any.	Given an address and num == -1, search the device table
+ *	for a device with that address and return if it's still present. Given
+ *	both, return the num'th driver only if its address matches. Return NULL
+ *	if not.
+ */
+	
+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;
+	}
+
+	if (ret && !try_module_get(ret->owner))
+		ret = NULL;
+
+	if (ret)
+		ret->usecount++;
+
+	up(&mtd_table_mutex);
+	return ret;
+}
+
+void put_mtd_device(struct mtd_info *mtd)
+{
+	int c;
+
+	down(&mtd_table_mutex);
+	c = --mtd->usecount;
+	up(&mtd_table_mutex);
+	BUG_ON(c < 0);
+
+	module_put(mtd->owner);
+}
+
+/* default_mtd_writev - default mtd writev method for MTD devices that
+ *			dont implement their own
+ */
+
+int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
+		       unsigned long count, loff_t to, size_t *retlen)
+{
+	unsigned long i;
+	size_t totlen = 0, thislen;
+	int ret = 0;
+
+	if(!mtd->write) {
+		ret = -EROFS;
+	} else {
+		for (i=0; i<count; i++) {
+			if (!vecs[i].iov_len)
+				continue;
+			ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base);
+			totlen += thislen;
+			if (ret || thislen != vecs[i].iov_len)
+				break;
+			to += vecs[i].iov_len;
+		}
+	}
+	if (retlen)
+		*retlen = totlen;
+	return ret;
+}
+
+
+/* default_mtd_readv - default mtd readv method for MTD devices that dont
+ *		       implement their own
+ */
+
+int default_mtd_readv(struct mtd_info *mtd, struct kvec *vecs,
+		      unsigned long count, loff_t from, size_t *retlen)
+{
+	unsigned long i;
+	size_t totlen = 0, thislen;
+	int ret = 0;
+
+	if(!mtd->read) {
+		ret = -EIO;
+	} else {
+		for (i=0; i<count; i++) {
+			if (!vecs[i].iov_len)
+				continue;
+			ret = mtd->read(mtd, from, vecs[i].iov_len, &thislen, vecs[i].iov_base);
+			totlen += thislen;
+			if (ret || thislen != vecs[i].iov_len)
+				break;
+			from += vecs[i].iov_len;
+		}
+	}
+	if (retlen)
+		*retlen = totlen;
+	return ret;
+}
+
+
+EXPORT_SYMBOL(add_mtd_device);
+EXPORT_SYMBOL(del_mtd_device);
+EXPORT_SYMBOL(get_mtd_device);
+EXPORT_SYMBOL(put_mtd_device);
+EXPORT_SYMBOL(register_mtd_user);
+EXPORT_SYMBOL(unregister_mtd_user);
+EXPORT_SYMBOL(default_mtd_writev);
+EXPORT_SYMBOL(default_mtd_readv);
+
+/*====================================================================*/
+/* Power management code */
+
+#ifdef CONFIG_PM
+
+#include <linux/pm.h>
+
+static struct pm_dev *mtd_pm_dev = NULL;
+
+static int mtd_pm_callback(struct pm_dev *dev, pm_request_t rqst, void *data)
+{
+	int ret = 0, i;
+
+	if (down_trylock(&mtd_table_mutex))
+		return -EAGAIN;
+	if (rqst == PM_SUSPEND) {
+		for (i = 0; ret == 0 && i < MAX_MTD_DEVICES; i++) {
+			if (mtd_table[i] && mtd_table[i]->suspend)
+				ret = mtd_table[i]->suspend(mtd_table[i]);
+		}
+	} else i = MAX_MTD_DEVICES-1;
+
+	if (rqst == PM_RESUME || ret) {
+		for ( ; i >= 0; i--) {
+			if (mtd_table[i] && mtd_table[i]->resume)
+				mtd_table[i]->resume(mtd_table[i]);
+		}
+	}
+	up(&mtd_table_mutex);
+	return ret;
+}
+#endif
+
+/*====================================================================*/
+/* Support for /proc/mtd */
+
+#ifdef CONFIG_PROC_FS
+static struct proc_dir_entry *proc_mtd;
+
+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: %8.8x %8.8x \"%s\"\n", i, this->size,
+		       this->erasesize, this->name);
+}
+
+static int mtd_read_proc (char *page, char **start, off_t off, int count,
+			  int *eof, void *data_unused)
+{
+	int len, l, i;
+        off_t   begin = 0;
+
+	down(&mtd_table_mutex);
+
+	len = sprintf(page, "dev:    size   erasesize  name\n");
+        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;
+                }
+        }
+
+        *eof = 1;
+
+done:
+	up(&mtd_table_mutex);
+        if (off >= len+begin)
+                return 0;
+        *start = page + (off-begin);
+        return ((count < begin+len-off) ? count : begin+len-off);
+}
+
+#endif /* CONFIG_PROC_FS */
+
+/*====================================================================*/
+/* Init code */
+
+static int __init init_mtd(void)
+{
+#ifdef CONFIG_PROC_FS
+	if ((proc_mtd = create_proc_entry( "mtd", 0, NULL )))
+		proc_mtd->read_proc = mtd_read_proc;
+#endif
+
+#ifdef CONFIG_PM
+	mtd_pm_dev = pm_register(PM_UNKNOWN_DEV, 0, mtd_pm_callback);
+#endif
+	return 0;
+}
+
+static void __exit cleanup_mtd(void)
+{
+#ifdef CONFIG_PM
+	if (mtd_pm_dev) {
+		pm_unregister(mtd_pm_dev);
+		mtd_pm_dev = NULL;
+	}
+#endif
+
+#ifdef CONFIG_PROC_FS
+        if (proc_mtd)
+		remove_proc_entry( "mtd", NULL);
+#endif
+}
+
+module_init(init_mtd);
+module_exit(cleanup_mtd);
+
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
+MODULE_DESCRIPTION("Core MTD registration and access routines");