[deliverable/linux.git] / drivers / mtd / mtdcore.c

/*
 * Core registration and callback routines for MTD
 * drivers and users.
 *
 */

#include <linux/module.h>
#include <linux/kernel.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/err.h>
#include <linux/ioctl.h>
#include <linux/init.h>
#include <linux/mtd/compatmac.h>
#include <linux/proc_fs.h>

#include <linux/mtd/mtd.h>

#include "mtdcore.h"

/* These are exported solely for the purpose of mtd_blkdevs.c. You
   should not use them for _anything_ else */
DEFINE_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;

	BUG_ON(mtd->writesize == 0);
	mutex_lock(&mtd_table_mutex);

	for (i=0; i < MAX_MTD_DEVICES; i++)
		if (!mtd_table[i]) {
			struct mtd_notifier *not;

			mtd_table[i] = mtd;
			mtd->index = i;
			mtd->usecount = 0;

			/* Some chips always power up locked. Unlock them now */
			if ((mtd->flags & MTD_WRITEABLE)
			    && (mtd->flags & MTD_POWERUP_LOCK) && mtd->unlock) {
				if (mtd->unlock(mtd, 0, mtd->size))
					printk(KERN_WARNING
					       "%s: unlock failed, "
					       "writes may not work\n",
					       mtd->name);
			}

			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_entry(not, &mtd_notifiers, list) {
				not->add(mtd);
			}

			mutex_unlock(&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;
		}

	mutex_unlock(&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;

	mutex_lock(&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 mtd_notifier *not;

		/* No need to get a refcount on the module containing
		   the notifier, since we hold the mtd_table_mutex */
		list_for_each_entry(not, &mtd_notifiers, list) {
			not->remove(mtd);
		}

		mtd_table[mtd->index] = NULL;

		module_put(THIS_MODULE);
		ret = 0;
	}

	mutex_unlock(&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;

	mutex_lock(&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]);

	mutex_unlock(&mtd_table_mutex);
}

/**
 *	unregister_mtd_user - unregister a 'user' of MTD devices.
 *	@old: 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;

	mutex_lock(&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);
	mutex_unlock(&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
 *	error code if not.
 */

struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num)
{
	struct mtd_info *ret = NULL;
	int i, err = -ENODEV;

	mutex_lock(&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)
		goto out_unlock;

	if (!try_module_get(ret->owner))
		goto out_unlock;

	if (ret->get_device) {
		err = ret->get_device(ret);
		if (err)
			goto out_put;
	}

	ret->usecount++;
	mutex_unlock(&mtd_table_mutex);
	return ret;

out_put:
	module_put(ret->owner);
out_unlock:
	mutex_unlock(&mtd_table_mutex);
	return ERR_PTR(err);
}

/**
 *	get_mtd_device_nm - obtain a validated handle for an MTD device by
 *	device name
 *	@name: MTD device name to open
 *
 * 	This function returns MTD device description structure in case of
 * 	success and an error code in case of failure.
 */

struct mtd_info *get_mtd_device_nm(const char *name)
{
	int i, err = -ENODEV;
	struct mtd_info *mtd = NULL;

	mutex_lock(&mtd_table_mutex);

	for (i = 0; i < MAX_MTD_DEVICES; i++) {
		if (mtd_table[i] && !strcmp(name, mtd_table[i]->name)) {
			mtd = mtd_table[i];
			break;
		}
	}

	if (!mtd)
		goto out_unlock;

	if (!try_module_get(mtd->owner))
		goto out_unlock;

	if (mtd->get_device) {
		err = mtd->get_device(mtd);
		if (err)
			goto out_put;
	}

	mtd->usecount++;
	mutex_unlock(&mtd_table_mutex);
	return mtd;

out_put:
	module_put(mtd->owner);
out_unlock:
	mutex_unlock(&mtd_table_mutex);
	return ERR_PTR(err);
}

void put_mtd_device(struct mtd_info *mtd)
{
	int c;

	mutex_lock(&mtd_table_mutex);
	c = --mtd->usecount;
	if (mtd->put_device)
		mtd->put_device(mtd);
	mutex_unlock(&mtd_table_mutex);
	BUG_ON(c < 0);

	module_put(mtd->owner);
}

/* default_mtd_writev - default mtd writev method for MTD devices that
 *			don't 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;
}

EXPORT_SYMBOL_GPL(add_mtd_device);
EXPORT_SYMBOL_GPL(del_mtd_device);
EXPORT_SYMBOL_GPL(get_mtd_device);
EXPORT_SYMBOL_GPL(get_mtd_device_nm);
EXPORT_SYMBOL_GPL(put_mtd_device);
EXPORT_SYMBOL_GPL(register_mtd_user);
EXPORT_SYMBOL_GPL(unregister_mtd_user);
EXPORT_SYMBOL_GPL(default_mtd_writev);

#ifdef CONFIG_PROC_FS

/*====================================================================*/
/* Support for /proc/mtd */

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;

	mutex_lock(&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:
	mutex_unlock(&mtd_table_mutex);
        if (off >= len+begin)
                return 0;
        *start = page + (off-begin);
        return ((count < begin+len-off) ? count : begin+len-off);
}

/*====================================================================*/
/* Init code */

static int __init init_mtd(void)
{
	if ((proc_mtd = create_proc_entry( "mtd", 0, NULL )))
		proc_mtd->read_proc = mtd_read_proc;
	return 0;
}

static void __exit cleanup_mtd(void)
{
        if (proc_mtd)
		remove_proc_entry( "mtd", NULL);
}

module_init(init_mtd);
module_exit(cleanup_mtd);

#endif /* CONFIG_PROC_FS */


MODULE_LICENSE("GPL");
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
MODULE_DESCRIPTION("Core MTD registration and access routines");
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* Core registration and callback routines for MTD
	3	* drivers and users.
	4	*
	5	*/
	6
1da177e4 LT	7	#include <linux/module.h>
1da177e4 LT	8	#include <linux/kernel.h>
1da177e4 LT	9	#include <linux/ptrace.h>
	10	#include <linux/slab.h>
	11	#include <linux/string.h>
	12	#include <linux/timer.h>
	13	#include <linux/major.h>
	14	#include <linux/fs.h>
7799308f	15	#include <linux/err.h>
1da177e4 LT	16	#include <linux/ioctl.h>
	17	#include <linux/init.h>
	18	#include <linux/mtd/compatmac.h>
1da177e4	19	#include <linux/proc_fs.h>
1da177e4 LT	20
	21	#include <linux/mtd/mtd.h>
	22
356d70f1 BD	23	#include "mtdcore.h"
356d70f1 BD	24
97894cda	25	/* These are exported solely for the purpose of mtd_blkdevs.c. You
1da177e4	26	should not use them for _anything_ else */
48b19268	27	DEFINE_MUTEX(mtd_table_mutex);
1da177e4 LT	28	struct mtd_info *mtd_table[MAX_MTD_DEVICES];
	29
	30	EXPORT_SYMBOL_GPL(mtd_table_mutex);
	31	EXPORT_SYMBOL_GPL(mtd_table);
	32
	33	static LIST_HEAD(mtd_notifiers);
	34
	35	/**
	36	* add_mtd_device - register an MTD device
	37	* @mtd: pointer to new MTD device info structure
	38	*
	39	* Add a device to the list of MTD devices present in the system, and
	40	* notify each currently active MTD 'user' of its arrival. Returns
	41	* zero on success or 1 on failure, which currently will only happen
	42	* if the number of present devices exceeds MAX_MTD_DEVICES (i.e. 16)
	43	*/
	44
	45	int add_mtd_device(struct mtd_info *mtd)
	46	{
	47	int i;
	48
783ed81f	49	BUG_ON(mtd->writesize == 0);
48b19268	50	mutex_lock(&mtd_table_mutex);
1da177e4 LT	51
	52	for (i=0; i < MAX_MTD_DEVICES; i++)
	53	if (!mtd_table[i]) {
2606c797	54	struct mtd_notifier *not;
1da177e4 LT	55
	56	mtd_table[i] = mtd;
	57	mtd->index = i;
	58	mtd->usecount = 0;
	59
187ef152 HS	60	/* Some chips always power up locked. Unlock them now */
187ef152 HS	61	if ((mtd->flags & MTD_WRITEABLE)
e619a75f	62	&& (mtd->flags & MTD_POWERUP_LOCK) && mtd->unlock) {
187ef152 HS	63	if (mtd->unlock(mtd, 0, mtd->size))
	64	printk(KERN_WARNING
	65	"%s: unlock failed, "
	66	"writes may not work\n",
	67	mtd->name);
	68	}
	69
1da177e4 LT	70	DEBUG(0, "mtd: Giving out device %d to %s\n",i, mtd->name);
	71	/* No need to get a refcount on the module containing
	72	the notifier, since we hold the mtd_table_mutex */
2606c797	73	list_for_each_entry(not, &mtd_notifiers, list) {
1da177e4 LT	74	not->add(mtd);
1da177e4 LT	75	}
97894cda	76
48b19268	77	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	78	/* We _know_ we aren't being removed, because
	79	our caller is still holding us here. So none
	80	of this try_ nonsense, and no bitching about it
	81	either. :) */
	82	__module_get(THIS_MODULE);
	83	return 0;
	84	}
97894cda	85
48b19268	86	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	87	return 1;
	88	}
	89
	90	/**
	91	* del_mtd_device - unregister an MTD device
	92	* @mtd: pointer to MTD device info structure
	93	*
	94	* Remove a device from the list of MTD devices present in the system,
	95	* and notify each currently active MTD 'user' of its departure.
	96	* Returns zero on success or 1 on failure, which currently will happen
	97	* if the requested device does not appear to be present in the list.
	98	*/
	99
	100	int del_mtd_device (struct mtd_info *mtd)
	101	{
	102	int ret;
97894cda	103
48b19268	104	mutex_lock(&mtd_table_mutex);
1da177e4 LT	105
	106	if (mtd_table[mtd->index] != mtd) {
	107	ret = -ENODEV;
	108	} else if (mtd->usecount) {
97894cda	109	printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n",
1da177e4 LT	110	mtd->index, mtd->name, mtd->usecount);
	111	ret = -EBUSY;
	112	} else {
856613c9	113	struct mtd_notifier *not;
1da177e4 LT	114
	115	/* No need to get a refcount on the module containing
	116	the notifier, since we hold the mtd_table_mutex */
856613c9	117	list_for_each_entry(not, &mtd_notifiers, list) {
1da177e4 LT	118	not->remove(mtd);
	119	}
	120
	121	mtd_table[mtd->index] = NULL;
	122
	123	module_put(THIS_MODULE);
	124	ret = 0;
	125	}
	126
48b19268	127	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	128	return ret;
	129	}
	130
	131	/**
	132	* register_mtd_user - register a 'user' of MTD devices.
	133	* @new: pointer to notifier info structure
	134	*
	135	* Registers a pair of callbacks function to be called upon addition
	136	* or removal of MTD devices. Causes the 'add' callback to be immediately
	137	* invoked for each MTD device currently present in the system.
	138	*/
	139
	140	void register_mtd_user (struct mtd_notifier *new)
	141	{
	142	int i;
	143
48b19268	144	mutex_lock(&mtd_table_mutex);
1da177e4 LT	145
	146	list_add(&new->list, &mtd_notifiers);
	147
	148	__module_get(THIS_MODULE);
97894cda	149
1da177e4 LT	150	for (i=0; i< MAX_MTD_DEVICES; i++)
	151	if (mtd_table[i])
	152	new->add(mtd_table[i]);
	153
48b19268	154	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	155	}
	156
	157	/**
49450795 AB	158	* unregister_mtd_user - unregister a 'user' of MTD devices.
49450795 AB	159	* @old: pointer to notifier info structure
1da177e4 LT	160	*
	161	* Removes a callback function pair from the list of 'users' to be
	162	* notified upon addition or removal of MTD devices. Causes the
	163	* 'remove' callback to be immediately invoked for each MTD device
	164	* currently present in the system.
	165	*/
	166
	167	int unregister_mtd_user (struct mtd_notifier *old)
	168	{
	169	int i;
	170
48b19268	171	mutex_lock(&mtd_table_mutex);
1da177e4 LT	172
	173	module_put(THIS_MODULE);
	174
	175	for (i=0; i< MAX_MTD_DEVICES; i++)
	176	if (mtd_table[i])
	177	old->remove(mtd_table[i]);
97894cda	178
1da177e4	179	list_del(&old->list);
48b19268	180	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	181	return 0;
	182	}
	183
	184
	185	/**
	186	* get_mtd_device - obtain a validated handle for an MTD device
	187	* @mtd: last known address of the required MTD device
	188	* @num: internal device number of the required MTD device
	189	*
	190	* Given a number and NULL address, return the num'th entry in the device
	191	* table, if any. Given an address and num == -1, search the device table
	192	* for a device with that address and return if it's still present. Given
9c74034f AB	193	* both, return the num'th driver only if its address matches. Return
9c74034f AB	194	* error code if not.
1da177e4	195	*/
97894cda	196
1da177e4 LT	197	struct mtd_info get_mtd_device(struct mtd_info mtd, int num)
	198	{
	199	struct mtd_info *ret = NULL;
9c74034f	200	int i, err = -ENODEV;
1da177e4	201
48b19268	202	mutex_lock(&mtd_table_mutex);
1da177e4 LT	203
	204	if (num == -1) {
	205	for (i=0; i< MAX_MTD_DEVICES; i++)
	206	if (mtd_table[i] == mtd)
	207	ret = mtd_table[i];
	208	} else if (num < MAX_MTD_DEVICES) {
	209	ret = mtd_table[num];
	210	if (mtd && mtd != ret)
	211	ret = NULL;
	212	}
	213
9fe912ce AB	214	if (!ret)
	215	goto out_unlock;
	216
9c74034f	217	if (!try_module_get(ret->owner))
9fe912ce	218	goto out_unlock;
9fe912ce	219
9c74034f AB	220	if (ret->get_device) {
	221	err = ret->get_device(ret);
	222	if (err)
	223	goto out_put;
9fe912ce	224	}
1da177e4	225
9fe912ce	226	ret->usecount++;
9c74034f AB	227	mutex_unlock(&mtd_table_mutex);
9c74034f AB	228	return ret;
1da177e4	229
9c74034f AB	230	out_put:
9c74034f AB	231	module_put(ret->owner);
9fe912ce	232	out_unlock:
48b19268	233	mutex_unlock(&mtd_table_mutex);
9c74034f	234	return ERR_PTR(err);
1da177e4 LT	235	}
1da177e4 LT	236
7799308f AB	237	/**
	238	* get_mtd_device_nm - obtain a validated handle for an MTD device by
	239	* device name
	240	* @name: MTD device name to open
	241	*
	242	* This function returns MTD device description structure in case of
	243	* success and an error code in case of failure.
	244	*/
	245
	246	struct mtd_info get_mtd_device_nm(const char name)
	247	{
9fe912ce AB	248	int i, err = -ENODEV;
9fe912ce AB	249	struct mtd_info *mtd = NULL;
7799308f AB	250
	251	mutex_lock(&mtd_table_mutex);
	252
	253	for (i = 0; i < MAX_MTD_DEVICES; i++) {
	254	if (mtd_table[i] && !strcmp(name, mtd_table[i]->name)) {
	255	mtd = mtd_table[i];
	256	break;
	257	}
	258	}
	259
9fe912ce	260	if (!mtd)
7799308f AB	261	goto out_unlock;
	262
	263	if (!try_module_get(mtd->owner))
	264	goto out_unlock;
	265
9fe912ce AB	266	if (mtd->get_device) {
	267	err = mtd->get_device(mtd);
	268	if (err)
	269	goto out_put;
	270	}
	271
7799308f	272	mtd->usecount++;
9fe912ce AB	273	mutex_unlock(&mtd_table_mutex);
9fe912ce AB	274	return mtd;
7799308f	275
9fe912ce AB	276	out_put:
9fe912ce AB	277	module_put(mtd->owner);
7799308f AB	278	out_unlock:
7799308f AB	279	mutex_unlock(&mtd_table_mutex);
9fe912ce	280	return ERR_PTR(err);
7799308f AB	281	}
7799308f AB	282
1da177e4 LT	283	void put_mtd_device(struct mtd_info *mtd)
	284	{
	285	int c;
	286
48b19268	287	mutex_lock(&mtd_table_mutex);
1da177e4	288	c = --mtd->usecount;
9fe912ce AB	289	if (mtd->put_device)
9fe912ce AB	290	mtd->put_device(mtd);
48b19268	291	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	292	BUG_ON(c < 0);
	293
	294	module_put(mtd->owner);
	295	}
	296
	297	/* default_mtd_writev - default mtd writev method for MTD devices that
dd36f267	298	* don't implement their own
1da177e4 LT	299	*/
	300
	301	int default_mtd_writev(struct mtd_info mtd, const struct kvec vecs,
	302	unsigned long count, loff_t to, size_t *retlen)
	303	{
	304	unsigned long i;
	305	size_t totlen = 0, thislen;
	306	int ret = 0;
	307
	308	if(!mtd->write) {
	309	ret = -EROFS;
	310	} else {
	311	for (i=0; i<count; i++) {
	312	if (!vecs[i].iov_len)
	313	continue;
	314	ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base);
	315	totlen += thislen;
	316	if (ret \|\| thislen != vecs[i].iov_len)
	317	break;
	318	to += vecs[i].iov_len;
	319	}
	320	}
	321	if (retlen)
	322	*retlen = totlen;
	323	return ret;
	324	}
	325
dd36f267 DW	326	EXPORT_SYMBOL_GPL(add_mtd_device);
	327	EXPORT_SYMBOL_GPL(del_mtd_device);
	328	EXPORT_SYMBOL_GPL(get_mtd_device);
	329	EXPORT_SYMBOL_GPL(get_mtd_device_nm);
	330	EXPORT_SYMBOL_GPL(put_mtd_device);
	331	EXPORT_SYMBOL_GPL(register_mtd_user);
	332	EXPORT_SYMBOL_GPL(unregister_mtd_user);
	333	EXPORT_SYMBOL_GPL(default_mtd_writev);
1da177e4	334
2d2dce0e PM	335	#ifdef CONFIG_PROC_FS
2d2dce0e PM	336
1da177e4 LT	337	/====================================================================/
	338	/* Support for /proc/mtd */
	339
1da177e4 LT	340	static struct proc_dir_entry *proc_mtd;
	341
	342	static inline int mtd_proc_info (char *buf, int i)
	343	{
	344	struct mtd_info *this = mtd_table[i];
	345
	346	if (!this)
	347	return 0;
	348
	349	return sprintf(buf, "mtd%d: %8.8x %8.8x \"%s\"\n", i, this->size,
	350	this->erasesize, this->name);
	351	}
	352
	353	static int mtd_read_proc (char page, char *start, off_t off, int count,
	354	int eof, void data_unused)
	355	{
	356	int len, l, i;
	357	off_t begin = 0;
	358
48b19268	359	mutex_lock(&mtd_table_mutex);
1da177e4 LT	360
	361	len = sprintf(page, "dev: size erasesize name\n");
	362	for (i=0; i< MAX_MTD_DEVICES; i++) {
	363
	364	l = mtd_proc_info(page + len, i);
	365	len += l;
	366	if (len+begin > off+count)
	367	goto done;
	368	if (len+begin < off) {
	369	begin += len;
	370	len = 0;
	371	}
	372	}
	373
	374	*eof = 1;
	375
	376	done:
48b19268	377	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	378	if (off >= len+begin)
	379	return 0;
	380	*start = page + (off-begin);
	381	return ((count < begin+len-off) ? count : begin+len-off);
	382	}
	383
1da177e4 LT	384	/====================================================================/
	385	/* Init code */
	386
	387	static int __init init_mtd(void)
	388	{
1da177e4 LT	389	if ((proc_mtd = create_proc_entry( "mtd", 0, NULL )))
1da177e4 LT	390	proc_mtd->read_proc = mtd_read_proc;
1da177e4 LT	391	return 0;
	392	}
	393
	394	static void __exit cleanup_mtd(void)
	395	{
1da177e4 LT	396	if (proc_mtd)
1da177e4 LT	397	remove_proc_entry( "mtd", NULL);
1da177e4 LT	398	}
	399
	400	module_init(init_mtd);
	401	module_exit(cleanup_mtd);
	402
2d2dce0e PM	403	#endif /* CONFIG_PROC_FS */
2d2dce0e PM	404
1da177e4 LT	405
	406	MODULE_LICENSE("GPL");
	407	MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
	408	MODULE_DESCRIPTION("Core MTD registration and access routines");