[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;

			if (is_power_of_2(mtd->erasesize))
				mtd->erasesize_shift = ffs(mtd->erasesize) - 1;
			else
				mtd->erasesize_shift = 0;

			if (is_power_of_2(mtd->writesize))
				mtd->writesize_shift = ffs(mtd->writesize) - 1;
			else
				mtd->writesize_shift = 0;

			mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1;
			mtd->writesize_mask = (1 << mtd->writesize_shift) - 1;

			/* 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: %8.8llx %8.8x \"%s\"\n", i,
		       (unsigned long long)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
69423d99 AH	60	if (is_power_of_2(mtd->erasesize))
	61	mtd->erasesize_shift = ffs(mtd->erasesize) - 1;
	62	else
	63	mtd->erasesize_shift = 0;
	64
	65	if (is_power_of_2(mtd->writesize))
	66	mtd->writesize_shift = ffs(mtd->writesize) - 1;
	67	else
	68	mtd->writesize_shift = 0;
	69
	70	mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1;
	71	mtd->writesize_mask = (1 << mtd->writesize_shift) - 1;
	72
187ef152 HS	73	/* Some chips always power up locked. Unlock them now */
187ef152 HS	74	if ((mtd->flags & MTD_WRITEABLE)
e619a75f	75	&& (mtd->flags & MTD_POWERUP_LOCK) && mtd->unlock) {
187ef152 HS	76	if (mtd->unlock(mtd, 0, mtd->size))
	77	printk(KERN_WARNING
	78	"%s: unlock failed, "
	79	"writes may not work\n",
	80	mtd->name);
	81	}
	82
1da177e4 LT	83	DEBUG(0, "mtd: Giving out device %d to %s\n",i, mtd->name);
	84	/* No need to get a refcount on the module containing
	85	the notifier, since we hold the mtd_table_mutex */
71a928c0	86	list_for_each_entry(not, &mtd_notifiers, list)
1da177e4	87	not->add(mtd);
97894cda	88
48b19268	89	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	90	/* We _know_ we aren't being removed, because
	91	our caller is still holding us here. So none
	92	of this try_ nonsense, and no bitching about it
	93	either. :) */
	94	__module_get(THIS_MODULE);
	95	return 0;
	96	}
97894cda	97
48b19268	98	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	99	return 1;
	100	}
	101
	102	/**
	103	* del_mtd_device - unregister an MTD device
	104	* @mtd: pointer to MTD device info structure
	105	*
	106	* Remove a device from the list of MTD devices present in the system,
	107	* and notify each currently active MTD 'user' of its departure.
	108	* Returns zero on success or 1 on failure, which currently will happen
	109	* if the requested device does not appear to be present in the list.
	110	*/
	111
	112	int del_mtd_device (struct mtd_info *mtd)
	113	{
	114	int ret;
97894cda	115
48b19268	116	mutex_lock(&mtd_table_mutex);
1da177e4 LT	117
	118	if (mtd_table[mtd->index] != mtd) {
	119	ret = -ENODEV;
	120	} else if (mtd->usecount) {
97894cda	121	printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n",
1da177e4 LT	122	mtd->index, mtd->name, mtd->usecount);
	123	ret = -EBUSY;
	124	} else {
856613c9	125	struct mtd_notifier *not;
1da177e4 LT	126
	127	/* No need to get a refcount on the module containing
	128	the notifier, since we hold the mtd_table_mutex */
71a928c0	129	list_for_each_entry(not, &mtd_notifiers, list)
1da177e4	130	not->remove(mtd);
1da177e4 LT	131
	132	mtd_table[mtd->index] = NULL;
	133
	134	module_put(THIS_MODULE);
	135	ret = 0;
	136	}
	137
48b19268	138	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	139	return ret;
	140	}
	141
	142	/**
	143	* register_mtd_user - register a 'user' of MTD devices.
	144	* @new: pointer to notifier info structure
	145	*
	146	* Registers a pair of callbacks function to be called upon addition
	147	* or removal of MTD devices. Causes the 'add' callback to be immediately
	148	* invoked for each MTD device currently present in the system.
	149	*/
	150
	151	void register_mtd_user (struct mtd_notifier *new)
	152	{
	153	int i;
	154
48b19268	155	mutex_lock(&mtd_table_mutex);
1da177e4 LT	156
	157	list_add(&new->list, &mtd_notifiers);
	158
	159	__module_get(THIS_MODULE);
97894cda	160
1da177e4 LT	161	for (i=0; i< MAX_MTD_DEVICES; i++)
	162	if (mtd_table[i])
	163	new->add(mtd_table[i]);
	164
48b19268	165	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	166	}
	167
	168	/**
49450795 AB	169	* unregister_mtd_user - unregister a 'user' of MTD devices.
49450795 AB	170	* @old: pointer to notifier info structure
1da177e4 LT	171	*
	172	* Removes a callback function pair from the list of 'users' to be
	173	* notified upon addition or removal of MTD devices. Causes the
	174	* 'remove' callback to be immediately invoked for each MTD device
	175	* currently present in the system.
	176	*/
	177
	178	int unregister_mtd_user (struct mtd_notifier *old)
	179	{
	180	int i;
	181
48b19268	182	mutex_lock(&mtd_table_mutex);
1da177e4 LT	183
	184	module_put(THIS_MODULE);
	185
	186	for (i=0; i< MAX_MTD_DEVICES; i++)
	187	if (mtd_table[i])
	188	old->remove(mtd_table[i]);
97894cda	189
1da177e4	190	list_del(&old->list);
48b19268	191	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	192	return 0;
	193	}
	194
	195
	196	/**
	197	* get_mtd_device - obtain a validated handle for an MTD device
	198	* @mtd: last known address of the required MTD device
	199	* @num: internal device number of the required MTD device
	200	*
	201	* Given a number and NULL address, return the num'th entry in the device
	202	* table, if any. Given an address and num == -1, search the device table
	203	* for a device with that address and return if it's still present. Given
9c74034f AB	204	* both, return the num'th driver only if its address matches. Return
9c74034f AB	205	* error code if not.
1da177e4	206	*/
97894cda	207
1da177e4 LT	208	struct mtd_info get_mtd_device(struct mtd_info mtd, int num)
	209	{
	210	struct mtd_info *ret = NULL;
9c74034f	211	int i, err = -ENODEV;
1da177e4	212
48b19268	213	mutex_lock(&mtd_table_mutex);
1da177e4 LT	214
	215	if (num == -1) {
	216	for (i=0; i< MAX_MTD_DEVICES; i++)
	217	if (mtd_table[i] == mtd)
	218	ret = mtd_table[i];
	219	} else if (num < MAX_MTD_DEVICES) {
	220	ret = mtd_table[num];
	221	if (mtd && mtd != ret)
	222	ret = NULL;
	223	}
	224
9fe912ce AB	225	if (!ret)
	226	goto out_unlock;
	227
9c74034f	228	if (!try_module_get(ret->owner))
9fe912ce	229	goto out_unlock;
9fe912ce	230
9c74034f AB	231	if (ret->get_device) {
	232	err = ret->get_device(ret);
	233	if (err)
	234	goto out_put;
9fe912ce	235	}
1da177e4	236
9fe912ce	237	ret->usecount++;
9c74034f AB	238	mutex_unlock(&mtd_table_mutex);
9c74034f AB	239	return ret;
1da177e4	240
9c74034f AB	241	out_put:
9c74034f AB	242	module_put(ret->owner);
9fe912ce	243	out_unlock:
48b19268	244	mutex_unlock(&mtd_table_mutex);
9c74034f	245	return ERR_PTR(err);
1da177e4 LT	246	}
1da177e4 LT	247
7799308f AB	248	/**
	249	* get_mtd_device_nm - obtain a validated handle for an MTD device by
	250	* device name
	251	* @name: MTD device name to open
	252	*
	253	* This function returns MTD device description structure in case of
	254	* success and an error code in case of failure.
	255	*/
	256
	257	struct mtd_info get_mtd_device_nm(const char name)
	258	{
9fe912ce AB	259	int i, err = -ENODEV;
9fe912ce AB	260	struct mtd_info *mtd = NULL;
7799308f AB	261
	262	mutex_lock(&mtd_table_mutex);
	263
	264	for (i = 0; i < MAX_MTD_DEVICES; i++) {
	265	if (mtd_table[i] && !strcmp(name, mtd_table[i]->name)) {
	266	mtd = mtd_table[i];
	267	break;
	268	}
	269	}
	270
9fe912ce	271	if (!mtd)
7799308f AB	272	goto out_unlock;
	273
	274	if (!try_module_get(mtd->owner))
	275	goto out_unlock;
	276
9fe912ce AB	277	if (mtd->get_device) {
	278	err = mtd->get_device(mtd);
	279	if (err)
	280	goto out_put;
	281	}
	282
7799308f	283	mtd->usecount++;
9fe912ce AB	284	mutex_unlock(&mtd_table_mutex);
9fe912ce AB	285	return mtd;
7799308f	286
9fe912ce AB	287	out_put:
9fe912ce AB	288	module_put(mtd->owner);
7799308f AB	289	out_unlock:
7799308f AB	290	mutex_unlock(&mtd_table_mutex);
9fe912ce	291	return ERR_PTR(err);
7799308f AB	292	}
7799308f AB	293
1da177e4 LT	294	void put_mtd_device(struct mtd_info *mtd)
	295	{
	296	int c;
	297
48b19268	298	mutex_lock(&mtd_table_mutex);
1da177e4	299	c = --mtd->usecount;
9fe912ce AB	300	if (mtd->put_device)
9fe912ce AB	301	mtd->put_device(mtd);
48b19268	302	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	303	BUG_ON(c < 0);
	304
	305	module_put(mtd->owner);
	306	}
	307
	308	/* default_mtd_writev - default mtd writev method for MTD devices that
dd36f267	309	* don't implement their own
1da177e4 LT	310	*/
	311
	312	int default_mtd_writev(struct mtd_info mtd, const struct kvec vecs,
	313	unsigned long count, loff_t to, size_t *retlen)
	314	{
	315	unsigned long i;
	316	size_t totlen = 0, thislen;
	317	int ret = 0;
	318
	319	if(!mtd->write) {
	320	ret = -EROFS;
	321	} else {
	322	for (i=0; i<count; i++) {
	323	if (!vecs[i].iov_len)
	324	continue;
	325	ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base);
	326	totlen += thislen;
	327	if (ret \|\| thislen != vecs[i].iov_len)
	328	break;
	329	to += vecs[i].iov_len;
	330	}
	331	}
	332	if (retlen)
	333	*retlen = totlen;
	334	return ret;
	335	}
	336
dd36f267 DW	337	EXPORT_SYMBOL_GPL(add_mtd_device);
	338	EXPORT_SYMBOL_GPL(del_mtd_device);
	339	EXPORT_SYMBOL_GPL(get_mtd_device);
	340	EXPORT_SYMBOL_GPL(get_mtd_device_nm);
	341	EXPORT_SYMBOL_GPL(put_mtd_device);
	342	EXPORT_SYMBOL_GPL(register_mtd_user);
	343	EXPORT_SYMBOL_GPL(unregister_mtd_user);
	344	EXPORT_SYMBOL_GPL(default_mtd_writev);
1da177e4	345
2d2dce0e PM	346	#ifdef CONFIG_PROC_FS
2d2dce0e PM	347
1da177e4 LT	348	/====================================================================/
	349	/* Support for /proc/mtd */
	350
1da177e4 LT	351	static struct proc_dir_entry *proc_mtd;
	352
	353	static inline int mtd_proc_info (char *buf, int i)
	354	{
	355	struct mtd_info *this = mtd_table[i];
	356
	357	if (!this)
	358	return 0;
	359
69423d99 AH	360	return sprintf(buf, "mtd%d: %8.8llx %8.8x \"%s\"\n", i,
69423d99 AH	361	(unsigned long long)this->size,
1da177e4 LT	362	this->erasesize, this->name);
	363	}
	364
	365	static int mtd_read_proc (char page, char *start, off_t off, int count,
	366	int eof, void data_unused)
	367	{
	368	int len, l, i;
	369	off_t begin = 0;
	370
48b19268	371	mutex_lock(&mtd_table_mutex);
1da177e4 LT	372
	373	len = sprintf(page, "dev: size erasesize name\n");
	374	for (i=0; i< MAX_MTD_DEVICES; i++) {
	375
	376	l = mtd_proc_info(page + len, i);
	377	len += l;
	378	if (len+begin > off+count)
	379	goto done;
	380	if (len+begin < off) {
	381	begin += len;
	382	len = 0;
	383	}
	384	}
	385
	386	*eof = 1;
	387
	388	done:
48b19268	389	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	390	if (off >= len+begin)
	391	return 0;
	392	*start = page + (off-begin);
	393	return ((count < begin+len-off) ? count : begin+len-off);
	394	}
	395
1da177e4 LT	396	/====================================================================/
	397	/* Init code */
	398
	399	static int __init init_mtd(void)
	400	{
1da177e4 LT	401	if ((proc_mtd = create_proc_entry( "mtd", 0, NULL )))
1da177e4 LT	402	proc_mtd->read_proc = mtd_read_proc;
1da177e4 LT	403	return 0;
	404	}
	405
	406	static void __exit cleanup_mtd(void)
	407	{
1da177e4 LT	408	if (proc_mtd)
1da177e4 LT	409	remove_proc_entry( "mtd", NULL);
1da177e4 LT	410	}
	411
	412	module_init(init_mtd);
	413	module_exit(cleanup_mtd);
	414
2d2dce0e PM	415	#endif /* CONFIG_PROC_FS */
2d2dce0e PM	416
1da177e4 LT	417
	418	MODULE_LICENSE("GPL");
	419	MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
	420	MODULE_DESCRIPTION("Core MTD registration and access routines");