[linux.git] / drivers / mfd / mfd-core.c

/*
 * drivers/mfd/mfd-core.c
 *
 * core MFD support
 * Copyright (c) 2006 Ian Molton
 * Copyright (c) 2007,2008 Dmitry Baryshkov
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/acpi.h>
#include <linux/property.h>
#include <linux/mfd/core.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/irqdomain.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>

static struct device_type mfd_dev_type = {
	.name	= "mfd_device",
};

int mfd_cell_enable(struct platform_device *pdev)
{
	const struct mfd_cell *cell = mfd_get_cell(pdev);
	int err = 0;

	/* only call enable hook if the cell wasn't previously enabled */
	if (atomic_inc_return(cell->usage_count) == 1)
		err = cell->enable(pdev);

	/* if the enable hook failed, decrement counter to allow retries */
	if (err)
		atomic_dec(cell->usage_count);

	return err;
}
EXPORT_SYMBOL(mfd_cell_enable);

int mfd_cell_disable(struct platform_device *pdev)
{
	const struct mfd_cell *cell = mfd_get_cell(pdev);
	int err = 0;

	/* only disable if no other clients are using it */
	if (atomic_dec_return(cell->usage_count) == 0)
		err = cell->disable(pdev);

	/* if the disable hook failed, increment to allow retries */
	if (err)
		atomic_inc(cell->usage_count);

	/* sanity check; did someone call disable too many times? */
	WARN_ON(atomic_read(cell->usage_count) < 0);

	return err;
}
EXPORT_SYMBOL(mfd_cell_disable);

static int mfd_platform_add_cell(struct platform_device *pdev,
				 const struct mfd_cell *cell,
				 atomic_t *usage_count)
{
	if (!cell)
		return 0;

	pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL);
	if (!pdev->mfd_cell)
		return -ENOMEM;

	pdev->mfd_cell->usage_count = usage_count;
	return 0;
}

#if IS_ENABLED(CONFIG_ACPI)
static void mfd_acpi_add_device(const struct mfd_cell *cell,
				struct platform_device *pdev)
{
	const struct mfd_cell_acpi_match *match = cell->acpi_match;
	struct acpi_device *parent, *child;
	struct acpi_device *adev;

	parent = ACPI_COMPANION(pdev->dev.parent);
	if (!parent)
		return;

	/*
	 * MFD child device gets its ACPI handle either from the ACPI device
	 * directly under the parent that matches the either _HID or _CID, or
	 * _ADR or it will use the parent handle if is no ID is given.
	 *
	 * Note that use of _ADR is a grey area in the ACPI specification,
	 * though Intel Galileo Gen2 is using it to distinguish the children
	 * devices.
	 */
	adev = parent;
	if (match) {
		if (match->pnpid) {
			struct acpi_device_id ids[2] = {};

			strlcpy(ids[0].id, match->pnpid, sizeof(ids[0].id));
			list_for_each_entry(child, &parent->children, node) {
				if (!acpi_match_device_ids(child, ids)) {
					adev = child;
					break;
				}
			}
		} else {
			unsigned long long adr;
			acpi_status status;

			list_for_each_entry(child, &parent->children, node) {
				status = acpi_evaluate_integer(child->handle,
							       "_ADR", NULL,
							       &adr);
				if (ACPI_SUCCESS(status) && match->adr == adr) {
					adev = child;
					break;
				}
			}
		}
	}

	ACPI_COMPANION_SET(&pdev->dev, adev);
}
#else
static inline void mfd_acpi_add_device(const struct mfd_cell *cell,
				       struct platform_device *pdev)
{
}
#endif

static int mfd_add_device(struct device *parent, int id,
			  const struct mfd_cell *cell, atomic_t *usage_count,
			  struct resource *mem_base,
			  int irq_base, struct irq_domain *domain)
{
	struct resource *res;
	struct platform_device *pdev;
	struct device_node *np = NULL;
	int ret = -ENOMEM;
	int platform_id;
	int r;

	if (id == PLATFORM_DEVID_AUTO)
		platform_id = id;
	else
		platform_id = id + cell->id;

	pdev = platform_device_alloc(cell->name, platform_id);
	if (!pdev)
		goto fail_alloc;

	res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
	if (!res)
		goto fail_device;

	pdev->dev.parent = parent;
	pdev->dev.type = &mfd_dev_type;
	pdev->dev.dma_mask = parent->dma_mask;
	pdev->dev.dma_parms = parent->dma_parms;
	pdev->dev.coherent_dma_mask = parent->coherent_dma_mask;

	ret = regulator_bulk_register_supply_alias(
			&pdev->dev, cell->parent_supplies,
			parent, cell->parent_supplies,
			cell->num_parent_supplies);
	if (ret < 0)
		goto fail_res;

	if (parent->of_node && cell->of_compatible) {
		for_each_child_of_node(parent->of_node, np) {
			if (of_device_is_compatible(np, cell->of_compatible)) {
				pdev->dev.of_node = np;
				break;
			}
		}
	}

	mfd_acpi_add_device(cell, pdev);

	if (cell->pdata_size) {
		ret = platform_device_add_data(pdev,
					cell->platform_data, cell->pdata_size);
		if (ret)
			goto fail_alias;
	}

	if (cell->properties) {
		ret = platform_device_add_properties(pdev, cell->properties);
		if (ret)
			goto fail_alias;
	}

	ret = mfd_platform_add_cell(pdev, cell, usage_count);
	if (ret)
		goto fail_alias;

	for (r = 0; r < cell->num_resources; r++) {
		res[r].name = cell->resources[r].name;
		res[r].flags = cell->resources[r].flags;

		/* Find out base to use */
		if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
			res[r].parent = mem_base;
			res[r].start = mem_base->start +
				cell->resources[r].start;
			res[r].end = mem_base->start +
				cell->resources[r].end;
		} else if (cell->resources[r].flags & IORESOURCE_IRQ) {
			if (domain) {
				/* Unable to create mappings for IRQ ranges. */
				WARN_ON(cell->resources[r].start !=
					cell->resources[r].end);
				res[r].start = res[r].end = irq_create_mapping(
					domain, cell->resources[r].start);
			} else {
				res[r].start = irq_base +
					cell->resources[r].start;
				res[r].end   = irq_base +
					cell->resources[r].end;
			}
		} else {
			res[r].parent = cell->resources[r].parent;
			res[r].start = cell->resources[r].start;
			res[r].end   = cell->resources[r].end;
		}

		if (!cell->ignore_resource_conflicts) {
			if (has_acpi_companion(&pdev->dev)) {
				ret = acpi_check_resource_conflict(&res[r]);
				if (ret)
					goto fail_alias;
			}
		}
	}

	ret = platform_device_add_resources(pdev, res, cell->num_resources);
	if (ret)
		goto fail_alias;

	ret = platform_device_add(pdev);
	if (ret)
		goto fail_alias;

	if (cell->pm_runtime_no_callbacks)
		pm_runtime_no_callbacks(&pdev->dev);

	kfree(res);

	return 0;

fail_alias:
	regulator_bulk_unregister_supply_alias(&pdev->dev,
					       cell->parent_supplies,
					       cell->num_parent_supplies);
fail_res:
	kfree(res);
fail_device:
	platform_device_put(pdev);
fail_alloc:
	return ret;
}

int mfd_add_devices(struct device *parent, int id,
		    const struct mfd_cell *cells, int n_devs,
		    struct resource *mem_base,
		    int irq_base, struct irq_domain *domain)
{
	int i;
	int ret;
	atomic_t *cnts;

	/* initialize reference counting for all cells */
	cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL);
	if (!cnts)
		return -ENOMEM;

	for (i = 0; i < n_devs; i++) {
		atomic_set(&cnts[i], 0);
		ret = mfd_add_device(parent, id, cells + i, cnts + i, mem_base,
				     irq_base, domain);
		if (ret)
			goto fail;
	}

	return 0;

fail:
	if (i)
		mfd_remove_devices(parent);
	else
		kfree(cnts);
	return ret;
}
EXPORT_SYMBOL(mfd_add_devices);

static int mfd_remove_devices_fn(struct device *dev, void *c)
{
	struct platform_device *pdev;
	const struct mfd_cell *cell;
	atomic_t **usage_count = c;

	if (dev->type != &mfd_dev_type)
		return 0;

	pdev = to_platform_device(dev);
	cell = mfd_get_cell(pdev);

	regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies,
					       cell->num_parent_supplies);

	/* find the base address of usage_count pointers (for freeing) */
	if (!*usage_count || (cell->usage_count < *usage_count))
		*usage_count = cell->usage_count;

	platform_device_unregister(pdev);
	return 0;
}

void mfd_remove_devices(struct device *parent)
{
	atomic_t *cnts = NULL;

	device_for_each_child_reverse(parent, &cnts, mfd_remove_devices_fn);
	kfree(cnts);
}
EXPORT_SYMBOL(mfd_remove_devices);

static void devm_mfd_dev_release(struct device *dev, void *res)
{
	mfd_remove_devices(dev);
}

/**
 * devm_mfd_add_devices - Resource managed version of mfd_add_devices()
 *
 * Returns 0 on success or an appropriate negative error number on failure.
 * All child-devices of the MFD will automatically be removed when it gets
 * unbinded.
 */
int devm_mfd_add_devices(struct device *dev, int id,
			 const struct mfd_cell *cells, int n_devs,
			 struct resource *mem_base,
			 int irq_base, struct irq_domain *domain)
{
	struct device **ptr;
	int ret;

	ptr = devres_alloc(devm_mfd_dev_release, sizeof(*ptr), GFP_KERNEL);
	if (!ptr)
		return -ENOMEM;

	ret = mfd_add_devices(dev, id, cells, n_devs, mem_base,
			      irq_base, domain);
	if (ret < 0) {
		devres_free(ptr);
		return ret;
	}

	*ptr = dev;
	devres_add(dev, ptr);

	return ret;
}
EXPORT_SYMBOL(devm_mfd_add_devices);

int mfd_clone_cell(const char *cell, const char **clones, size_t n_clones)
{
	struct mfd_cell cell_entry;
	struct device *dev;
	struct platform_device *pdev;
	int i;

	/* fetch the parent cell's device (should already be registered!) */
	dev = bus_find_device_by_name(&platform_bus_type, NULL, cell);
	if (!dev) {
		printk(KERN_ERR "failed to find device for cell %s\n", cell);
		return -ENODEV;
	}
	pdev = to_platform_device(dev);
	memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry));

	WARN_ON(!cell_entry.enable);

	for (i = 0; i < n_clones; i++) {
		cell_entry.name = clones[i];
		/* don't give up if a single call fails; just report error */
		if (mfd_add_device(pdev->dev.parent, -1, &cell_entry,
				   cell_entry.usage_count, NULL, 0, NULL))
			dev_err(dev, "failed to create platform device '%s'\n",
					clones[i]);
	}

	put_device(dev);

	return 0;
}
EXPORT_SYMBOL(mfd_clone_cell);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");
Commit	Line	Data
aa613de6 DB	1	/*
	2	* drivers/mfd/mfd-core.c
	3	*
	4	* core MFD support
	5	* Copyright (c) 2006 Ian Molton
	6	* Copyright (c) 2007,2008 Dmitry Baryshkov
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/platform_device.h>
91fedede	16	#include <linux/acpi.h>
4d215cab	17	#include <linux/property.h>
aa613de6	18	#include <linux/mfd/core.h>
4c90aa94	19	#include <linux/pm_runtime.h>
5a0e3ad6	20	#include <linux/slab.h>
4e36dd33	21	#include <linux/module.h>
c94bb233 LJ	22	#include <linux/irqdomain.h>
c94bb233 LJ	23	#include <linux/of.h>
7fcd4274	24	#include <linux/regulator/consumer.h>
aa613de6	25
b9fbb62e CK	26	static struct device_type mfd_dev_type = {
	27	.name = "mfd_device",
	28	};
	29
f77289ac	30	int mfd_cell_enable(struct platform_device *pdev)
1e29af62 AS	31	{
	32	const struct mfd_cell *cell = mfd_get_cell(pdev);
	33	int err = 0;
	34
	35	/* only call enable hook if the cell wasn't previously enabled */
	36	if (atomic_inc_return(cell->usage_count) == 1)
	37	err = cell->enable(pdev);
	38
	39	/* if the enable hook failed, decrement counter to allow retries */
	40	if (err)
	41	atomic_dec(cell->usage_count);
	42
	43	return err;
	44	}
f77289ac	45	EXPORT_SYMBOL(mfd_cell_enable);
1e29af62	46
f77289ac	47	int mfd_cell_disable(struct platform_device *pdev)
1e29af62 AS	48	{
	49	const struct mfd_cell *cell = mfd_get_cell(pdev);
	50	int err = 0;
	51
	52	/* only disable if no other clients are using it */
	53	if (atomic_dec_return(cell->usage_count) == 0)
	54	err = cell->disable(pdev);
	55
	56	/* if the disable hook failed, increment to allow retries */
	57	if (err)
	58	atomic_inc(cell->usage_count);
	59
	60	/* sanity check; did someone call disable too many times? */
	61	WARN_ON(atomic_read(cell->usage_count) < 0);
	62
	63	return err;
	64	}
f77289ac	65	EXPORT_SYMBOL(mfd_cell_disable);
1e29af62	66
e710d7d5	67	static int mfd_platform_add_cell(struct platform_device *pdev,
03e361b2 GU	68	const struct mfd_cell *cell,
03e361b2 GU	69	atomic_t *usage_count)
e710d7d5 SO	70	{
	71	if (!cell)
	72	return 0;
	73
	74	pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL);
	75	if (!pdev->mfd_cell)
	76	return -ENOMEM;
	77
03e361b2	78	pdev->mfd_cell->usage_count = usage_count;
e710d7d5 SO	79	return 0;
	80	}
	81
6ab34301 MW	82	#if IS_ENABLED(CONFIG_ACPI)
	83	static void mfd_acpi_add_device(const struct mfd_cell *cell,
	84	struct platform_device *pdev)
	85	{
98a3be44 AS	86	const struct mfd_cell_acpi_match *match = cell->acpi_match;
98a3be44 AS	87	struct acpi_device parent, child;
6ab34301 MW	88	struct acpi_device *adev;
6ab34301 MW	89
98a3be44 AS	90	parent = ACPI_COMPANION(pdev->dev.parent);
98a3be44 AS	91	if (!parent)
6ab34301 MW	92	return;
	93
	94	/*
98a3be44 AS	95	* MFD child device gets its ACPI handle either from the ACPI device
	96	* directly under the parent that matches the either _HID or _CID, or
	97	* _ADR or it will use the parent handle if is no ID is given.
	98	*
	99	* Note that use of _ADR is a grey area in the ACPI specification,
	100	* though Intel Galileo Gen2 is using it to distinguish the children
	101	* devices.
6ab34301	102	*/
98a3be44 AS	103	adev = parent;
	104	if (match) {
	105	if (match->pnpid) {
	106	struct acpi_device_id ids[2] = {};
	107
	108	strlcpy(ids[0].id, match->pnpid, sizeof(ids[0].id));
	109	list_for_each_entry(child, &parent->children, node) {
ee414de5	110	if (!acpi_match_device_ids(child, ids)) {
98a3be44 AS	111	adev = child;
	112	break;
	113	}
6ab34301	114	}
98a3be44 AS	115	} else {
	116	unsigned long long adr;
	117	acpi_status status;
	118
	119	list_for_each_entry(child, &parent->children, node) {
	120	status = acpi_evaluate_integer(child->handle,
	121	"_ADR", NULL,
	122	&adr);
	123	if (ACPI_SUCCESS(status) && match->adr == adr) {
	124	adev = child;
	125	break;
	126	}
	127	}
	128	}
6ab34301 MW	129	}
	130
	131	ACPI_COMPANION_SET(&pdev->dev, adev);
	132	}
	133	#else
	134	static inline void mfd_acpi_add_device(const struct mfd_cell *cell,
	135	struct platform_device *pdev)
	136	{
	137	}
	138	#endif
	139
424f525a	140	static int mfd_add_device(struct device *parent, int id,
03e361b2	141	const struct mfd_cell cell, atomic_t usage_count,
7f71ac93	142	struct resource *mem_base,
0848c94f	143	int irq_base, struct irq_domain *domain)
aa613de6	144	{
a87903f3	145	struct resource *res;
aa613de6	146	struct platform_device *pdev;
c94bb233	147	struct device_node *np = NULL;
aa613de6	148	int ret = -ENOMEM;
6e3f62f0	149	int platform_id;
aa613de6 DB	150	int r;
aa613de6 DB	151
a77c50b4	152	if (id == PLATFORM_DEVID_AUTO)
6e3f62f0 JH	153	platform_id = id;
	154	else
	155	platform_id = id + cell->id;
	156
	157	pdev = platform_device_alloc(cell->name, platform_id);
aa613de6 DB	158	if (!pdev)
	159	goto fail_alloc;
	160
a87903f3 IM	161	res = kzalloc(sizeof(res) cell->num_resources, GFP_KERNEL);
	162	if (!res)
	163	goto fail_device;
	164
424f525a	165	pdev->dev.parent = parent;
b9fbb62e	166	pdev->dev.type = &mfd_dev_type;
b018e136 BS	167	pdev->dev.dma_mask = parent->dma_mask;
b018e136 BS	168	pdev->dev.dma_parms = parent->dma_parms;
4f08df1b	169	pdev->dev.coherent_dma_mask = parent->coherent_dma_mask;
aa613de6	170
d137be00	171	ret = regulator_bulk_register_supply_alias(
7fcd4274 CK	172	&pdev->dev, cell->parent_supplies,
	173	parent, cell->parent_supplies,
	174	cell->num_parent_supplies);
	175	if (ret < 0)
	176	goto fail_res;
	177
c94bb233 LJ	178	if (parent->of_node && cell->of_compatible) {
	179	for_each_child_of_node(parent->of_node, np) {
	180	if (of_device_is_compatible(np, cell->of_compatible)) {
	181	pdev->dev.of_node = np;
c94bb233 LJ	182	break;
	183	}
	184	}
	185	}
	186
6ab34301 MW	187	mfd_acpi_add_device(cell, pdev);
6ab34301 MW	188
eb895607 SO	189	if (cell->pdata_size) {
	190	ret = platform_device_add_data(pdev,
	191	cell->platform_data, cell->pdata_size);
	192	if (ret)
7fcd4274	193	goto fail_alias;
eb895607 SO	194	}
eb895607 SO	195
f4d05266 HK	196	if (cell->properties) {
f4d05266 HK	197	ret = platform_device_add_properties(pdev, cell->properties);
4d215cab AS	198	if (ret)
	199	goto fail_alias;
	200	}
	201
03e361b2	202	ret = mfd_platform_add_cell(pdev, cell, usage_count);
fe891a00	203	if (ret)
7fcd4274	204	goto fail_alias;
aa613de6	205
aa613de6 DB	206	for (r = 0; r < cell->num_resources; r++) {
	207	res[r].name = cell->resources[r].name;
	208	res[r].flags = cell->resources[r].flags;
	209
	210	/* Find out base to use */
f03cfcbc	211	if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
aa613de6 DB	212	res[r].parent = mem_base;
	213	res[r].start = mem_base->start +
	214	cell->resources[r].start;
	215	res[r].end = mem_base->start +
	216	cell->resources[r].end;
	217	} else if (cell->resources[r].flags & IORESOURCE_IRQ) {
c94bb233 LJ	218	if (domain) {
	219	/* Unable to create mappings for IRQ ranges. */
	220	WARN_ON(cell->resources[r].start !=
	221	cell->resources[r].end);
	222	res[r].start = res[r].end = irq_create_mapping(
	223	domain, cell->resources[r].start);
	224	} else {
	225	res[r].start = irq_base +
	226	cell->resources[r].start;
	227	res[r].end = irq_base +
	228	cell->resources[r].end;
	229	}
aa613de6 DB	230	} else {
	231	res[r].parent = cell->resources[r].parent;
	232	res[r].start = cell->resources[r].start;
	233	res[r].end = cell->resources[r].end;
	234	}
91fedede	235
5f2545fa	236	if (!cell->ignore_resource_conflicts) {
ec40c606 LP	237	if (has_acpi_companion(&pdev->dev)) {
	238	ret = acpi_check_resource_conflict(&res[r]);
	239	if (ret)
	240	goto fail_alias;
	241	}
5f2545fa	242	}
aa613de6 DB	243	}
aa613de6 DB	244
8af5fe3b AL	245	ret = platform_device_add_resources(pdev, res, cell->num_resources);
8af5fe3b AL	246	if (ret)
7fcd4274	247	goto fail_alias;
aa613de6 DB	248
	249	ret = platform_device_add(pdev);
	250	if (ret)
7fcd4274	251	goto fail_alias;
a87903f3	252
4c90aa94 MB	253	if (cell->pm_runtime_no_callbacks)
	254	pm_runtime_no_callbacks(&pdev->dev);
	255
a87903f3	256	kfree(res);
aa613de6 DB	257
	258	return 0;
	259
7fcd4274	260	fail_alias:
d137be00 CK	261	regulator_bulk_unregister_supply_alias(&pdev->dev,
	262	cell->parent_supplies,
	263	cell->num_parent_supplies);
a87903f3 IM	264	fail_res:
a87903f3 IM	265	kfree(res);
aa613de6 DB	266	fail_device:
	267	platform_device_put(pdev);
	268	fail_alloc:
	269	return ret;
	270	}
	271
424f525a	272	int mfd_add_devices(struct device *parent, int id,
03e361b2	273	const struct mfd_cell *cells, int n_devs,
7f71ac93	274	struct resource *mem_base,
0848c94f	275	int irq_base, struct irq_domain *domain)
aa613de6 DB	276	{
aa613de6 DB	277	int i;
0b208e41	278	int ret;
1e29af62 AS	279	atomic_t *cnts;
	280
	281	/* initialize reference counting for all cells */
d1b5c5e2	282	cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL);
1e29af62 AS	283	if (!cnts)
1e29af62 AS	284	return -ENOMEM;
aa613de6 DB	285
aa613de6 DB	286	for (i = 0; i < n_devs; i++) {
1e29af62	287	atomic_set(&cnts[i], 0);
03e361b2	288	ret = mfd_add_device(parent, id, cells + i, cnts + i, mem_base,
0848c94f	289	irq_base, domain);
aa613de6	290	if (ret)
0b208e41	291	goto fail;
aa613de6 DB	292	}
aa613de6 DB	293
0b208e41	294	return 0;
aa613de6	295
0b208e41 GU	296	fail:
	297	if (i)
	298	mfd_remove_devices(parent);
	299	else
	300	kfree(cnts);
aa613de6 DB	301	return ret;
	302	}
	303	EXPORT_SYMBOL(mfd_add_devices);
	304
1e29af62	305	static int mfd_remove_devices_fn(struct device dev, void c)
aa613de6	306	{
b9fbb62e CK	307	struct platform_device *pdev;
b9fbb62e CK	308	const struct mfd_cell *cell;
1e29af62 AS	309	atomic_t **usage_count = c;
1e29af62 AS	310
b9fbb62e CK	311	if (dev->type != &mfd_dev_type)
	312	return 0;
	313
	314	pdev = to_platform_device(dev);
	315	cell = mfd_get_cell(pdev);
	316
d137be00 CK	317	regulator_bulk_unregister_supply_alias(dev, cell->parent_supplies,
	318	cell->num_parent_supplies);
	319
1e29af62 AS	320	/* find the base address of usage_count pointers (for freeing) */
	321	if (!usage_count \|\| (cell->usage_count < usage_count))
	322	*usage_count = cell->usage_count;
	323
	324	platform_device_unregister(pdev);
aa613de6 DB	325	return 0;
	326	}
	327
424f525a	328	void mfd_remove_devices(struct device *parent)
aa613de6	329	{
1e29af62 AS	330	atomic_t *cnts = NULL;
1e29af62 AS	331
b9a8a271	332	device_for_each_child_reverse(parent, &cnts, mfd_remove_devices_fn);
1e29af62	333	kfree(cnts);
aa613de6 DB	334	}
	335	EXPORT_SYMBOL(mfd_remove_devices);
	336
a8f447be LD	337	static void devm_mfd_dev_release(struct device dev, void res)
	338	{
	339	mfd_remove_devices(dev);
	340	}
	341
	342	/**
	343	* devm_mfd_add_devices - Resource managed version of mfd_add_devices()
	344	*
	345	* Returns 0 on success or an appropriate negative error number on failure.
	346	* All child-devices of the MFD will automatically be removed when it gets
	347	* unbinded.
	348	*/
	349	int devm_mfd_add_devices(struct device *dev, int id,
	350	const struct mfd_cell *cells, int n_devs,
	351	struct resource *mem_base,
	352	int irq_base, struct irq_domain *domain)
	353	{
	354	struct device **ptr;
	355	int ret;
	356
	357	ptr = devres_alloc(devm_mfd_dev_release, sizeof(*ptr), GFP_KERNEL);
	358	if (!ptr)
	359	return -ENOMEM;
	360
	361	ret = mfd_add_devices(dev, id, cells, n_devs, mem_base,
	362	irq_base, domain);
	363	if (ret < 0) {
	364	devres_free(ptr);
	365	return ret;
	366	}
	367
	368	*ptr = dev;
	369	devres_add(dev, ptr);
	370
	371	return ret;
	372	}
	373	EXPORT_SYMBOL(devm_mfd_add_devices);
	374
fa1df691	375	int mfd_clone_cell(const char cell, const char *clones, size_t n_clones)
a9bbba99 AS	376	{
	377	struct mfd_cell cell_entry;
	378	struct device *dev;
	379	struct platform_device *pdev;
fa1df691	380	int i;
a9bbba99 AS	381
	382	/* fetch the parent cell's device (should already be registered!) */
	383	dev = bus_find_device_by_name(&platform_bus_type, NULL, cell);
	384	if (!dev) {
	385	printk(KERN_ERR "failed to find device for cell %s\n", cell);
	386	return -ENODEV;
	387	}
	388	pdev = to_platform_device(dev);
	389	memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry));
	390
	391	WARN_ON(!cell_entry.enable);
	392
fa1df691 AS	393	for (i = 0; i < n_clones; i++) {
	394	cell_entry.name = clones[i];
	395	/* don't give up if a single call fails; just report error */
03e361b2 GU	396	if (mfd_add_device(pdev->dev.parent, -1, &cell_entry,
03e361b2 GU	397	cell_entry.usage_count, NULL, 0, NULL))
fa1df691 AS	398	dev_err(dev, "failed to create platform device '%s'\n",
	399	clones[i]);
	400	}
a9bbba99	401
722f1910 JH	402	put_device(dev);
722f1910 JH	403
fa1df691	404	return 0;
a9bbba99	405	}
fa1df691	406	EXPORT_SYMBOL(mfd_clone_cell);
a9bbba99	407
aa613de6 DB	408	MODULE_LICENSE("GPL");
aa613de6 DB	409	MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");