[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 */
71a928c0	73	list_for_each_entry(not, &mtd_notifiers, list)
1da177e4	74	not->add(mtd);
97894cda	75
48b19268	76	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	77	/* We _know_ we aren't being removed, because
	78	our caller is still holding us here. So none
	79	of this try_ nonsense, and no bitching about it
	80	either. :) */
	81	__module_get(THIS_MODULE);
	82	return 0;
	83	}
97894cda	84
48b19268	85	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	86	return 1;
	87	}
	88
	89	/**
	90	* del_mtd_device - unregister an MTD device
	91	* @mtd: pointer to MTD device info structure
	92	*
	93	* Remove a device from the list of MTD devices present in the system,
	94	* and notify each currently active MTD 'user' of its departure.
	95	* Returns zero on success or 1 on failure, which currently will happen
	96	* if the requested device does not appear to be present in the list.
	97	*/
	98
	99	int del_mtd_device (struct mtd_info *mtd)
	100	{
	101	int ret;
97894cda	102
48b19268	103	mutex_lock(&mtd_table_mutex);
1da177e4 LT	104
	105	if (mtd_table[mtd->index] != mtd) {
	106	ret = -ENODEV;
	107	} else if (mtd->usecount) {
97894cda	108	printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n",
1da177e4 LT	109	mtd->index, mtd->name, mtd->usecount);
	110	ret = -EBUSY;
	111	} else {
856613c9	112	struct mtd_notifier *not;
1da177e4 LT	113
	114	/* No need to get a refcount on the module containing
	115	the notifier, since we hold the mtd_table_mutex */
71a928c0	116	list_for_each_entry(not, &mtd_notifiers, list)
1da177e4	117	not->remove(mtd);
1da177e4 LT	118
	119	mtd_table[mtd->index] = NULL;
	120
	121	module_put(THIS_MODULE);
	122	ret = 0;
	123	}
	124
48b19268	125	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	126	return ret;
	127	}
	128
	129	/**
	130	* register_mtd_user - register a 'user' of MTD devices.
	131	* @new: pointer to notifier info structure
	132	*
	133	* Registers a pair of callbacks function to be called upon addition
	134	* or removal of MTD devices. Causes the 'add' callback to be immediately
	135	* invoked for each MTD device currently present in the system.
	136	*/
	137
	138	void register_mtd_user (struct mtd_notifier *new)
	139	{
	140	int i;
	141
48b19268	142	mutex_lock(&mtd_table_mutex);
1da177e4 LT	143
	144	list_add(&new->list, &mtd_notifiers);
	145
	146	__module_get(THIS_MODULE);
97894cda	147
1da177e4 LT	148	for (i=0; i< MAX_MTD_DEVICES; i++)
	149	if (mtd_table[i])
	150	new->add(mtd_table[i]);
	151
48b19268	152	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	153	}
	154
	155	/**
49450795 AB	156	* unregister_mtd_user - unregister a 'user' of MTD devices.
49450795 AB	157	* @old: pointer to notifier info structure
1da177e4 LT	158	*
	159	* Removes a callback function pair from the list of 'users' to be
	160	* notified upon addition or removal of MTD devices. Causes the
	161	* 'remove' callback to be immediately invoked for each MTD device
	162	* currently present in the system.
	163	*/
	164
	165	int unregister_mtd_user (struct mtd_notifier *old)
	166	{
	167	int i;
	168
48b19268	169	mutex_lock(&mtd_table_mutex);
1da177e4 LT	170
	171	module_put(THIS_MODULE);
	172
	173	for (i=0; i< MAX_MTD_DEVICES; i++)
	174	if (mtd_table[i])
	175	old->remove(mtd_table[i]);
97894cda	176
1da177e4	177	list_del(&old->list);
48b19268	178	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	179	return 0;
	180	}
	181
	182
	183	/**
	184	* get_mtd_device - obtain a validated handle for an MTD device
	185	* @mtd: last known address of the required MTD device
	186	* @num: internal device number of the required MTD device
	187	*
	188	* Given a number and NULL address, return the num'th entry in the device
	189	* table, if any. Given an address and num == -1, search the device table
	190	* for a device with that address and return if it's still present. Given
9c74034f AB	191	* both, return the num'th driver only if its address matches. Return
9c74034f AB	192	* error code if not.
1da177e4	193	*/
97894cda	194
1da177e4 LT	195	struct mtd_info get_mtd_device(struct mtd_info mtd, int num)
	196	{
	197	struct mtd_info *ret = NULL;
9c74034f	198	int i, err = -ENODEV;
1da177e4	199
48b19268	200	mutex_lock(&mtd_table_mutex);
1da177e4 LT	201
	202	if (num == -1) {
	203	for (i=0; i< MAX_MTD_DEVICES; i++)
	204	if (mtd_table[i] == mtd)
	205	ret = mtd_table[i];
	206	} else if (num < MAX_MTD_DEVICES) {
	207	ret = mtd_table[num];
	208	if (mtd && mtd != ret)
	209	ret = NULL;
	210	}
	211
9fe912ce AB	212	if (!ret)
	213	goto out_unlock;
	214
9c74034f	215	if (!try_module_get(ret->owner))
9fe912ce	216	goto out_unlock;
9fe912ce	217
9c74034f AB	218	if (ret->get_device) {
	219	err = ret->get_device(ret);
	220	if (err)
	221	goto out_put;
9fe912ce	222	}
1da177e4	223
9fe912ce	224	ret->usecount++;
9c74034f AB	225	mutex_unlock(&mtd_table_mutex);
9c74034f AB	226	return ret;
1da177e4	227
9c74034f AB	228	out_put:
9c74034f AB	229	module_put(ret->owner);
9fe912ce	230	out_unlock:
48b19268	231	mutex_unlock(&mtd_table_mutex);
9c74034f	232	return ERR_PTR(err);
1da177e4 LT	233	}
1da177e4 LT	234
7799308f AB	235	/**
	236	* get_mtd_device_nm - obtain a validated handle for an MTD device by
	237	* device name
	238	* @name: MTD device name to open
	239	*
	240	* This function returns MTD device description structure in case of
	241	* success and an error code in case of failure.
	242	*/
	243
	244	struct mtd_info get_mtd_device_nm(const char name)
	245	{
9fe912ce AB	246	int i, err = -ENODEV;
9fe912ce AB	247	struct mtd_info *mtd = NULL;
7799308f AB	248
	249	mutex_lock(&mtd_table_mutex);
	250
	251	for (i = 0; i < MAX_MTD_DEVICES; i++) {
	252	if (mtd_table[i] && !strcmp(name, mtd_table[i]->name)) {
	253	mtd = mtd_table[i];
	254	break;
	255	}
	256	}
	257
9fe912ce	258	if (!mtd)
7799308f AB	259	goto out_unlock;
	260
	261	if (!try_module_get(mtd->owner))
	262	goto out_unlock;
	263
9fe912ce AB	264	if (mtd->get_device) {
	265	err = mtd->get_device(mtd);
	266	if (err)
	267	goto out_put;
	268	}
	269
7799308f	270	mtd->usecount++;
9fe912ce AB	271	mutex_unlock(&mtd_table_mutex);
9fe912ce AB	272	return mtd;
7799308f	273
9fe912ce AB	274	out_put:
9fe912ce AB	275	module_put(mtd->owner);
7799308f AB	276	out_unlock:
7799308f AB	277	mutex_unlock(&mtd_table_mutex);
9fe912ce	278	return ERR_PTR(err);
7799308f AB	279	}
7799308f AB	280
1da177e4 LT	281	void put_mtd_device(struct mtd_info *mtd)
	282	{
	283	int c;
	284
48b19268	285	mutex_lock(&mtd_table_mutex);
1da177e4	286	c = --mtd->usecount;
9fe912ce AB	287	if (mtd->put_device)
9fe912ce AB	288	mtd->put_device(mtd);
48b19268	289	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	290	BUG_ON(c < 0);
	291
	292	module_put(mtd->owner);
	293	}
	294
	295	/* default_mtd_writev - default mtd writev method for MTD devices that
dd36f267	296	* don't implement their own
1da177e4 LT	297	*/
	298
	299	int default_mtd_writev(struct mtd_info mtd, const struct kvec vecs,
	300	unsigned long count, loff_t to, size_t *retlen)
	301	{
	302	unsigned long i;
	303	size_t totlen = 0, thislen;
	304	int ret = 0;
	305
	306	if(!mtd->write) {
	307	ret = -EROFS;
	308	} else {
	309	for (i=0; i<count; i++) {
	310	if (!vecs[i].iov_len)
	311	continue;
	312	ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base);
	313	totlen += thislen;
	314	if (ret \|\| thislen != vecs[i].iov_len)
	315	break;
	316	to += vecs[i].iov_len;
	317	}
	318	}
	319	if (retlen)
	320	*retlen = totlen;
	321	return ret;
	322	}
	323
dd36f267 DW	324	EXPORT_SYMBOL_GPL(add_mtd_device);
	325	EXPORT_SYMBOL_GPL(del_mtd_device);
	326	EXPORT_SYMBOL_GPL(get_mtd_device);
	327	EXPORT_SYMBOL_GPL(get_mtd_device_nm);
	328	EXPORT_SYMBOL_GPL(put_mtd_device);
	329	EXPORT_SYMBOL_GPL(register_mtd_user);
	330	EXPORT_SYMBOL_GPL(unregister_mtd_user);
	331	EXPORT_SYMBOL_GPL(default_mtd_writev);
1da177e4	332
2d2dce0e PM	333	#ifdef CONFIG_PROC_FS
2d2dce0e PM	334
1da177e4 LT	335	/====================================================================/
	336	/* Support for /proc/mtd */
	337
1da177e4 LT	338	static struct proc_dir_entry *proc_mtd;
	339
	340	static inline int mtd_proc_info (char *buf, int i)
	341	{
	342	struct mtd_info *this = mtd_table[i];
	343
	344	if (!this)
	345	return 0;
	346
	347	return sprintf(buf, "mtd%d: %8.8x %8.8x \"%s\"\n", i, this->size,
	348	this->erasesize, this->name);
	349	}
	350
	351	static int mtd_read_proc (char page, char *start, off_t off, int count,
	352	int eof, void data_unused)
	353	{
	354	int len, l, i;
	355	off_t begin = 0;
	356
48b19268	357	mutex_lock(&mtd_table_mutex);
1da177e4 LT	358
	359	len = sprintf(page, "dev: size erasesize name\n");
	360	for (i=0; i< MAX_MTD_DEVICES; i++) {
	361
	362	l = mtd_proc_info(page + len, i);
	363	len += l;
	364	if (len+begin > off+count)
	365	goto done;
	366	if (len+begin < off) {
	367	begin += len;
	368	len = 0;
	369	}
	370	}
	371
	372	*eof = 1;
	373
	374	done:
48b19268	375	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	376	if (off >= len+begin)
	377	return 0;
	378	*start = page + (off-begin);
	379	return ((count < begin+len-off) ? count : begin+len-off);
	380	}
	381
1da177e4 LT	382	/====================================================================/
	383	/* Init code */
	384
	385	static int __init init_mtd(void)
	386	{
1da177e4 LT	387	if ((proc_mtd = create_proc_entry( "mtd", 0, NULL )))
1da177e4 LT	388	proc_mtd->read_proc = mtd_read_proc;
1da177e4 LT	389	return 0;
	390	}
	391
	392	static void __exit cleanup_mtd(void)
	393	{
1da177e4 LT	394	if (proc_mtd)
1da177e4 LT	395	remove_proc_entry( "mtd", NULL);
1da177e4 LT	396	}
	397
	398	module_init(init_mtd);
	399	module_exit(cleanup_mtd);
	400
2d2dce0e PM	401	#endif /* CONFIG_PROC_FS */
2d2dce0e PM	402
1da177e4 LT	403
	404	MODULE_LICENSE("GPL");
	405	MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
	406	MODULE_DESCRIPTION("Core MTD registration and access routines");