[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 "internal.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;

	if (!mtd->backing_dev_info) {
		switch (mtd->type) {
		case MTD_RAM:
			mtd->backing_dev_info = &mtd_bdi_rw_mappable;
			break;
		case MTD_ROM:
			mtd->backing_dev_info = &mtd_bdi_ro_mappable;
			break;
		default:
			mtd->backing_dev_info = &mtd_bdi_unmappable;
			break;
		}
	}

	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
1da177e4 LT	21	#include <linux/mtd/mtd.h>
402d3265	22	#include "internal.h"
1da177e4	23
356d70f1 BD	24	#include "mtdcore.h"
356d70f1 BD	25
97894cda	26	/* These are exported solely for the purpose of mtd_blkdevs.c. You
1da177e4	27	should not use them for _anything_ else */
48b19268	28	DEFINE_MUTEX(mtd_table_mutex);
1da177e4 LT	29	struct mtd_info *mtd_table[MAX_MTD_DEVICES];
	30
	31	EXPORT_SYMBOL_GPL(mtd_table_mutex);
	32	EXPORT_SYMBOL_GPL(mtd_table);
	33
	34	static LIST_HEAD(mtd_notifiers);
	35
	36	/**
	37	* add_mtd_device - register an MTD device
	38	* @mtd: pointer to new MTD device info structure
	39	*
	40	* Add a device to the list of MTD devices present in the system, and
	41	* notify each currently active MTD 'user' of its arrival. Returns
	42	* zero on success or 1 on failure, which currently will only happen
	43	* if the number of present devices exceeds MAX_MTD_DEVICES (i.e. 16)
	44	*/
	45
	46	int add_mtd_device(struct mtd_info *mtd)
	47	{
	48	int i;
	49
402d3265 DH	50	if (!mtd->backing_dev_info) {
	51	switch (mtd->type) {
	52	case MTD_RAM:
	53	mtd->backing_dev_info = &mtd_bdi_rw_mappable;
	54	break;
	55	case MTD_ROM:
	56	mtd->backing_dev_info = &mtd_bdi_ro_mappable;
	57	break;
	58	default:
	59	mtd->backing_dev_info = &mtd_bdi_unmappable;
	60	break;
	61	}
	62	}
	63
783ed81f	64	BUG_ON(mtd->writesize == 0);
48b19268	65	mutex_lock(&mtd_table_mutex);
1da177e4 LT	66
	67	for (i=0; i < MAX_MTD_DEVICES; i++)
	68	if (!mtd_table[i]) {
2606c797	69	struct mtd_notifier *not;
1da177e4 LT	70
	71	mtd_table[i] = mtd;
	72	mtd->index = i;
	73	mtd->usecount = 0;
	74
69423d99 AH	75	if (is_power_of_2(mtd->erasesize))
	76	mtd->erasesize_shift = ffs(mtd->erasesize) - 1;
	77	else
	78	mtd->erasesize_shift = 0;
	79
	80	if (is_power_of_2(mtd->writesize))
	81	mtd->writesize_shift = ffs(mtd->writesize) - 1;
	82	else
	83	mtd->writesize_shift = 0;
	84
	85	mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1;
	86	mtd->writesize_mask = (1 << mtd->writesize_shift) - 1;
	87
187ef152 HS	88	/* Some chips always power up locked. Unlock them now */
187ef152 HS	89	if ((mtd->flags & MTD_WRITEABLE)
e619a75f	90	&& (mtd->flags & MTD_POWERUP_LOCK) && mtd->unlock) {
187ef152 HS	91	if (mtd->unlock(mtd, 0, mtd->size))
	92	printk(KERN_WARNING
	93	"%s: unlock failed, "
	94	"writes may not work\n",
	95	mtd->name);
	96	}
	97
1da177e4 LT	98	DEBUG(0, "mtd: Giving out device %d to %s\n",i, mtd->name);
	99	/* No need to get a refcount on the module containing
	100	the notifier, since we hold the mtd_table_mutex */
71a928c0	101	list_for_each_entry(not, &mtd_notifiers, list)
1da177e4	102	not->add(mtd);
97894cda	103
48b19268	104	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	105	/* We _know_ we aren't being removed, because
	106	our caller is still holding us here. So none
	107	of this try_ nonsense, and no bitching about it
	108	either. :) */
	109	__module_get(THIS_MODULE);
	110	return 0;
	111	}
97894cda	112
48b19268	113	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	114	return 1;
	115	}
	116
	117	/**
	118	* del_mtd_device - unregister an MTD device
	119	* @mtd: pointer to MTD device info structure
	120	*
	121	* Remove a device from the list of MTD devices present in the system,
	122	* and notify each currently active MTD 'user' of its departure.
	123	* Returns zero on success or 1 on failure, which currently will happen
	124	* if the requested device does not appear to be present in the list.
	125	*/
	126
	127	int del_mtd_device (struct mtd_info *mtd)
	128	{
	129	int ret;
97894cda	130
48b19268	131	mutex_lock(&mtd_table_mutex);
1da177e4 LT	132
	133	if (mtd_table[mtd->index] != mtd) {
	134	ret = -ENODEV;
	135	} else if (mtd->usecount) {
97894cda	136	printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n",
1da177e4 LT	137	mtd->index, mtd->name, mtd->usecount);
	138	ret = -EBUSY;
	139	} else {
856613c9	140	struct mtd_notifier *not;
1da177e4 LT	141
	142	/* No need to get a refcount on the module containing
	143	the notifier, since we hold the mtd_table_mutex */
71a928c0	144	list_for_each_entry(not, &mtd_notifiers, list)
1da177e4	145	not->remove(mtd);
1da177e4 LT	146
	147	mtd_table[mtd->index] = NULL;
	148
	149	module_put(THIS_MODULE);
	150	ret = 0;
	151	}
	152
48b19268	153	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	154	return ret;
	155	}
	156
	157	/**
	158	* register_mtd_user - register a 'user' of MTD devices.
	159	* @new: pointer to notifier info structure
	160	*
	161	* Registers a pair of callbacks function to be called upon addition
	162	* or removal of MTD devices. Causes the 'add' callback to be immediately
	163	* invoked for each MTD device currently present in the system.
	164	*/
	165
	166	void register_mtd_user (struct mtd_notifier *new)
	167	{
	168	int i;
	169
48b19268	170	mutex_lock(&mtd_table_mutex);
1da177e4 LT	171
	172	list_add(&new->list, &mtd_notifiers);
	173
	174	__module_get(THIS_MODULE);
97894cda	175
1da177e4 LT	176	for (i=0; i< MAX_MTD_DEVICES; i++)
	177	if (mtd_table[i])
	178	new->add(mtd_table[i]);
	179
48b19268	180	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	181	}
	182
	183	/**
49450795 AB	184	* unregister_mtd_user - unregister a 'user' of MTD devices.
49450795 AB	185	* @old: pointer to notifier info structure
1da177e4 LT	186	*
	187	* Removes a callback function pair from the list of 'users' to be
	188	* notified upon addition or removal of MTD devices. Causes the
	189	* 'remove' callback to be immediately invoked for each MTD device
	190	* currently present in the system.
	191	*/
	192
	193	int unregister_mtd_user (struct mtd_notifier *old)
	194	{
	195	int i;
	196
48b19268	197	mutex_lock(&mtd_table_mutex);
1da177e4 LT	198
	199	module_put(THIS_MODULE);
	200
	201	for (i=0; i< MAX_MTD_DEVICES; i++)
	202	if (mtd_table[i])
	203	old->remove(mtd_table[i]);
97894cda	204
1da177e4	205	list_del(&old->list);
48b19268	206	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	207	return 0;
	208	}
	209
	210
	211	/**
	212	* get_mtd_device - obtain a validated handle for an MTD device
	213	* @mtd: last known address of the required MTD device
	214	* @num: internal device number of the required MTD device
	215	*
	216	* Given a number and NULL address, return the num'th entry in the device
	217	* table, if any. Given an address and num == -1, search the device table
	218	* for a device with that address and return if it's still present. Given
9c74034f AB	219	* both, return the num'th driver only if its address matches. Return
9c74034f AB	220	* error code if not.
1da177e4	221	*/
97894cda	222
1da177e4 LT	223	struct mtd_info get_mtd_device(struct mtd_info mtd, int num)
	224	{
	225	struct mtd_info *ret = NULL;
9c74034f	226	int i, err = -ENODEV;
1da177e4	227
48b19268	228	mutex_lock(&mtd_table_mutex);
1da177e4 LT	229
	230	if (num == -1) {
	231	for (i=0; i< MAX_MTD_DEVICES; i++)
	232	if (mtd_table[i] == mtd)
	233	ret = mtd_table[i];
	234	} else if (num < MAX_MTD_DEVICES) {
	235	ret = mtd_table[num];
	236	if (mtd && mtd != ret)
	237	ret = NULL;
	238	}
	239
9fe912ce AB	240	if (!ret)
	241	goto out_unlock;
	242
9c74034f	243	if (!try_module_get(ret->owner))
9fe912ce	244	goto out_unlock;
9fe912ce	245
9c74034f AB	246	if (ret->get_device) {
	247	err = ret->get_device(ret);
	248	if (err)
	249	goto out_put;
9fe912ce	250	}
1da177e4	251
9fe912ce	252	ret->usecount++;
9c74034f AB	253	mutex_unlock(&mtd_table_mutex);
9c74034f AB	254	return ret;
1da177e4	255
9c74034f AB	256	out_put:
9c74034f AB	257	module_put(ret->owner);
9fe912ce	258	out_unlock:
48b19268	259	mutex_unlock(&mtd_table_mutex);
9c74034f	260	return ERR_PTR(err);
1da177e4 LT	261	}
1da177e4 LT	262
7799308f AB	263	/**
	264	* get_mtd_device_nm - obtain a validated handle for an MTD device by
	265	* device name
	266	* @name: MTD device name to open
	267	*
	268	* This function returns MTD device description structure in case of
	269	* success and an error code in case of failure.
	270	*/
	271
	272	struct mtd_info get_mtd_device_nm(const char name)
	273	{
9fe912ce AB	274	int i, err = -ENODEV;
9fe912ce AB	275	struct mtd_info *mtd = NULL;
7799308f AB	276
	277	mutex_lock(&mtd_table_mutex);
	278
	279	for (i = 0; i < MAX_MTD_DEVICES; i++) {
	280	if (mtd_table[i] && !strcmp(name, mtd_table[i]->name)) {
	281	mtd = mtd_table[i];
	282	break;
	283	}
	284	}
	285
9fe912ce	286	if (!mtd)
7799308f AB	287	goto out_unlock;
	288
	289	if (!try_module_get(mtd->owner))
	290	goto out_unlock;
	291
9fe912ce AB	292	if (mtd->get_device) {
	293	err = mtd->get_device(mtd);
	294	if (err)
	295	goto out_put;
	296	}
	297
7799308f	298	mtd->usecount++;
9fe912ce AB	299	mutex_unlock(&mtd_table_mutex);
9fe912ce AB	300	return mtd;
7799308f	301
9fe912ce AB	302	out_put:
9fe912ce AB	303	module_put(mtd->owner);
7799308f AB	304	out_unlock:
7799308f AB	305	mutex_unlock(&mtd_table_mutex);
9fe912ce	306	return ERR_PTR(err);
7799308f AB	307	}
7799308f AB	308
1da177e4 LT	309	void put_mtd_device(struct mtd_info *mtd)
	310	{
	311	int c;
	312
48b19268	313	mutex_lock(&mtd_table_mutex);
1da177e4	314	c = --mtd->usecount;
9fe912ce AB	315	if (mtd->put_device)
9fe912ce AB	316	mtd->put_device(mtd);
48b19268	317	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	318	BUG_ON(c < 0);
	319
	320	module_put(mtd->owner);
	321	}
	322
	323	/* default_mtd_writev - default mtd writev method for MTD devices that
dd36f267	324	* don't implement their own
1da177e4 LT	325	*/
	326
	327	int default_mtd_writev(struct mtd_info mtd, const struct kvec vecs,
	328	unsigned long count, loff_t to, size_t *retlen)
	329	{
	330	unsigned long i;
	331	size_t totlen = 0, thislen;
	332	int ret = 0;
	333
	334	if(!mtd->write) {
	335	ret = -EROFS;
	336	} else {
	337	for (i=0; i<count; i++) {
	338	if (!vecs[i].iov_len)
	339	continue;
	340	ret = mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base);
	341	totlen += thislen;
	342	if (ret \|\| thislen != vecs[i].iov_len)
	343	break;
	344	to += vecs[i].iov_len;
	345	}
	346	}
	347	if (retlen)
	348	*retlen = totlen;
	349	return ret;
	350	}
	351
dd36f267 DW	352	EXPORT_SYMBOL_GPL(add_mtd_device);
	353	EXPORT_SYMBOL_GPL(del_mtd_device);
	354	EXPORT_SYMBOL_GPL(get_mtd_device);
	355	EXPORT_SYMBOL_GPL(get_mtd_device_nm);
	356	EXPORT_SYMBOL_GPL(put_mtd_device);
	357	EXPORT_SYMBOL_GPL(register_mtd_user);
	358	EXPORT_SYMBOL_GPL(unregister_mtd_user);
	359	EXPORT_SYMBOL_GPL(default_mtd_writev);
1da177e4	360
2d2dce0e PM	361	#ifdef CONFIG_PROC_FS
2d2dce0e PM	362
1da177e4 LT	363	/====================================================================/
	364	/* Support for /proc/mtd */
	365
1da177e4 LT	366	static struct proc_dir_entry *proc_mtd;
	367
	368	static inline int mtd_proc_info (char *buf, int i)
	369	{
	370	struct mtd_info *this = mtd_table[i];
	371
	372	if (!this)
	373	return 0;
	374
69423d99 AH	375	return sprintf(buf, "mtd%d: %8.8llx %8.8x \"%s\"\n", i,
69423d99 AH	376	(unsigned long long)this->size,
1da177e4 LT	377	this->erasesize, this->name);
	378	}
	379
	380	static int mtd_read_proc (char page, char *start, off_t off, int count,
	381	int eof, void data_unused)
	382	{
	383	int len, l, i;
	384	off_t begin = 0;
	385
48b19268	386	mutex_lock(&mtd_table_mutex);
1da177e4 LT	387
	388	len = sprintf(page, "dev: size erasesize name\n");
	389	for (i=0; i< MAX_MTD_DEVICES; i++) {
	390
	391	l = mtd_proc_info(page + len, i);
	392	len += l;
	393	if (len+begin > off+count)
	394	goto done;
	395	if (len+begin < off) {
	396	begin += len;
	397	len = 0;
	398	}
	399	}
	400
	401	*eof = 1;
	402
	403	done:
48b19268	404	mutex_unlock(&mtd_table_mutex);
1da177e4 LT	405	if (off >= len+begin)
	406	return 0;
	407	*start = page + (off-begin);
	408	return ((count < begin+len-off) ? count : begin+len-off);
	409	}
	410
1da177e4 LT	411	/====================================================================/
	412	/* Init code */
	413
	414	static int __init init_mtd(void)
	415	{
1da177e4 LT	416	if ((proc_mtd = create_proc_entry( "mtd", 0, NULL )))
1da177e4 LT	417	proc_mtd->read_proc = mtd_read_proc;
1da177e4 LT	418	return 0;
	419	}
	420
	421	static void __exit cleanup_mtd(void)
	422	{
1da177e4 LT	423	if (proc_mtd)
1da177e4 LT	424	remove_proc_entry( "mtd", NULL);
1da177e4 LT	425	}
	426
	427	module_init(init_mtd);
	428	module_exit(cleanup_mtd);
	429
2d2dce0e PM	430	#endif /* CONFIG_PROC_FS */
2d2dce0e PM	431
1da177e4 LT	432
	433	MODULE_LICENSE("GPL");
	434	MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
	435	MODULE_DESCRIPTION("Core MTD registration and access routines");