[linux-2.6-block.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/mfd/core.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/irqdomain.h>
#include <linux/of.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)
{
	if (!cell)
		return 0;

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

	return 0;
}

static int mfd_add_device(struct device *parent, int id,
			  const struct mfd_cell *cell,
			  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 r;

	pdev = platform_device_alloc(cell->name, id + cell->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;

	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;
			}
		}
	}

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

	ret = mfd_platform_add_cell(pdev, cell);
	if (ret)
		goto fail_res;

	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) {
			ret = acpi_check_resource_conflict(&res[r]);
			if (ret)
				goto fail_res;
		}
	}

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

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

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

	kfree(res);

	return 0;

fail_res:
	kfree(res);
fail_device:
	platform_device_put(pdev);
fail_alloc:
	return ret;
}

int mfd_add_devices(struct device *parent, int id,
		    struct mfd_cell *cells, int n_devs,
		    struct resource *mem_base,
		    int irq_base, struct irq_domain *domain)
{
	int i;
	int ret = 0;
	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);
		cells[i].usage_count = &cnts[i];
		ret = mfd_add_device(parent, id, cells + i, mem_base,
				     irq_base, domain);
		if (ret)
			break;
	}

	if (ret)
		mfd_remove_devices(parent);

	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);

	/* 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(parent, &cnts, mfd_remove_devices_fn);
	kfree(cnts);
}
EXPORT_SYMBOL(mfd_remove_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, NULL, 0,
				   NULL))
			dev_err(dev, "failed to create platform device '%s'\n",
					clones[i]);
	}

	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>
aa613de6	17	#include <linux/mfd/core.h>
4c90aa94	18	#include <linux/pm_runtime.h>
5a0e3ad6	19	#include <linux/slab.h>
4e36dd33	20	#include <linux/module.h>
c94bb233 LJ	21	#include <linux/irqdomain.h>
c94bb233 LJ	22	#include <linux/of.h>
aa613de6	23
b9fbb62e CK	24	static struct device_type mfd_dev_type = {
	25	.name = "mfd_device",
	26	};
	27
f77289ac	28	int mfd_cell_enable(struct platform_device *pdev)
1e29af62 AS	29	{
	30	const struct mfd_cell *cell = mfd_get_cell(pdev);
	31	int err = 0;
	32
	33	/* only call enable hook if the cell wasn't previously enabled */
	34	if (atomic_inc_return(cell->usage_count) == 1)
	35	err = cell->enable(pdev);
	36
	37	/* if the enable hook failed, decrement counter to allow retries */
	38	if (err)
	39	atomic_dec(cell->usage_count);
	40
	41	return err;
	42	}
f77289ac	43	EXPORT_SYMBOL(mfd_cell_enable);
1e29af62	44
f77289ac	45	int mfd_cell_disable(struct platform_device *pdev)
1e29af62 AS	46	{
	47	const struct mfd_cell *cell = mfd_get_cell(pdev);
	48	int err = 0;
	49
	50	/* only disable if no other clients are using it */
	51	if (atomic_dec_return(cell->usage_count) == 0)
	52	err = cell->disable(pdev);
	53
	54	/* if the disable hook failed, increment to allow retries */
	55	if (err)
	56	atomic_inc(cell->usage_count);
	57
	58	/* sanity check; did someone call disable too many times? */
	59	WARN_ON(atomic_read(cell->usage_count) < 0);
	60
	61	return err;
	62	}
f77289ac	63	EXPORT_SYMBOL(mfd_cell_disable);
1e29af62	64
e710d7d5 SO	65	static int mfd_platform_add_cell(struct platform_device *pdev,
	66	const struct mfd_cell *cell)
	67	{
	68	if (!cell)
	69	return 0;
	70
	71	pdev->mfd_cell = kmemdup(cell, sizeof(*cell), GFP_KERNEL);
	72	if (!pdev->mfd_cell)
	73	return -ENOMEM;
	74
	75	return 0;
	76	}
	77
424f525a	78	static int mfd_add_device(struct device *parent, int id,
7f71ac93 BD	79	const struct mfd_cell *cell,
7f71ac93 BD	80	struct resource *mem_base,
0848c94f	81	int irq_base, struct irq_domain *domain)
aa613de6	82	{
a87903f3	83	struct resource *res;
aa613de6	84	struct platform_device *pdev;
c94bb233	85	struct device_node *np = NULL;
aa613de6 DB	86	int ret = -ENOMEM;
	87	int r;
	88
3bed6e41	89	pdev = platform_device_alloc(cell->name, id + cell->id);
aa613de6 DB	90	if (!pdev)
	91	goto fail_alloc;
	92
a87903f3 IM	93	res = kzalloc(sizeof(res) cell->num_resources, GFP_KERNEL);
	94	if (!res)
	95	goto fail_device;
	96
424f525a	97	pdev->dev.parent = parent;
b9fbb62e	98	pdev->dev.type = &mfd_dev_type;
aa613de6	99
c94bb233 LJ	100	if (parent->of_node && cell->of_compatible) {
	101	for_each_child_of_node(parent->of_node, np) {
	102	if (of_device_is_compatible(np, cell->of_compatible)) {
	103	pdev->dev.of_node = np;
c94bb233 LJ	104	break;
	105	}
	106	}
	107	}
	108
eb895607 SO	109	if (cell->pdata_size) {
	110	ret = platform_device_add_data(pdev,
	111	cell->platform_data, cell->pdata_size);
	112	if (ret)
	113	goto fail_res;
	114	}
	115
e710d7d5	116	ret = mfd_platform_add_cell(pdev, cell);
fe891a00 AS	117	if (ret)
fe891a00 AS	118	goto fail_res;
aa613de6	119
aa613de6 DB	120	for (r = 0; r < cell->num_resources; r++) {
	121	res[r].name = cell->resources[r].name;
	122	res[r].flags = cell->resources[r].flags;
	123
	124	/* Find out base to use */
f03cfcbc	125	if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
aa613de6 DB	126	res[r].parent = mem_base;
	127	res[r].start = mem_base->start +
	128	cell->resources[r].start;
	129	res[r].end = mem_base->start +
	130	cell->resources[r].end;
	131	} else if (cell->resources[r].flags & IORESOURCE_IRQ) {
c94bb233 LJ	132	if (domain) {
	133	/* Unable to create mappings for IRQ ranges. */
	134	WARN_ON(cell->resources[r].start !=
	135	cell->resources[r].end);
	136	res[r].start = res[r].end = irq_create_mapping(
	137	domain, cell->resources[r].start);
	138	} else {
	139	res[r].start = irq_base +
	140	cell->resources[r].start;
	141	res[r].end = irq_base +
	142	cell->resources[r].end;
	143	}
aa613de6 DB	144	} else {
	145	res[r].parent = cell->resources[r].parent;
	146	res[r].start = cell->resources[r].start;
	147	res[r].end = cell->resources[r].end;
	148	}
91fedede	149
5f2545fa	150	if (!cell->ignore_resource_conflicts) {
855cc454	151	ret = acpi_check_resource_conflict(&res[r]);
5f2545fa DD	152	if (ret)
	153	goto fail_res;
	154	}
aa613de6 DB	155	}
aa613de6 DB	156
8af5fe3b AL	157	ret = platform_device_add_resources(pdev, res, cell->num_resources);
	158	if (ret)
	159	goto fail_res;
aa613de6 DB	160
	161	ret = platform_device_add(pdev);
	162	if (ret)
a87903f3 IM	163	goto fail_res;
a87903f3 IM	164
4c90aa94 MB	165	if (cell->pm_runtime_no_callbacks)
	166	pm_runtime_no_callbacks(&pdev->dev);
	167
a87903f3	168	kfree(res);
aa613de6 DB	169
	170	return 0;
	171
a87903f3 IM	172	fail_res:
a87903f3 IM	173	kfree(res);
aa613de6 DB	174	fail_device:
	175	platform_device_put(pdev);
	176	fail_alloc:
	177	return ret;
	178	}
	179
424f525a	180	int mfd_add_devices(struct device *parent, int id,
1e29af62	181	struct mfd_cell *cells, int n_devs,
7f71ac93	182	struct resource *mem_base,
0848c94f	183	int irq_base, struct irq_domain *domain)
aa613de6 DB	184	{
	185	int i;
	186	int ret = 0;
1e29af62 AS	187	atomic_t *cnts;
	188
	189	/* initialize reference counting for all cells */
d1b5c5e2	190	cnts = kcalloc(n_devs, sizeof(*cnts), GFP_KERNEL);
1e29af62 AS	191	if (!cnts)
1e29af62 AS	192	return -ENOMEM;
aa613de6 DB	193
aa613de6 DB	194	for (i = 0; i < n_devs; i++) {
1e29af62 AS	195	atomic_set(&cnts[i], 0);
1e29af62 AS	196	cells[i].usage_count = &cnts[i];
0848c94f MB	197	ret = mfd_add_device(parent, id, cells + i, mem_base,
0848c94f MB	198	irq_base, domain);
aa613de6 DB	199	if (ret)
	200	break;
	201	}
	202
	203	if (ret)
	204	mfd_remove_devices(parent);
	205
	206	return ret;
	207	}
	208	EXPORT_SYMBOL(mfd_add_devices);
	209
1e29af62	210	static int mfd_remove_devices_fn(struct device dev, void c)
aa613de6	211	{
b9fbb62e CK	212	struct platform_device *pdev;
b9fbb62e CK	213	const struct mfd_cell *cell;
1e29af62 AS	214	atomic_t **usage_count = c;
1e29af62 AS	215
b9fbb62e CK	216	if (dev->type != &mfd_dev_type)
	217	return 0;
	218
	219	pdev = to_platform_device(dev);
	220	cell = mfd_get_cell(pdev);
	221
1e29af62 AS	222	/* find the base address of usage_count pointers (for freeing) */
	223	if (!usage_count \|\| (cell->usage_count < usage_count))
	224	*usage_count = cell->usage_count;
	225
	226	platform_device_unregister(pdev);
aa613de6 DB	227	return 0;
	228	}
	229
424f525a	230	void mfd_remove_devices(struct device *parent)
aa613de6	231	{
1e29af62 AS	232	atomic_t *cnts = NULL;
	233
	234	device_for_each_child(parent, &cnts, mfd_remove_devices_fn);
	235	kfree(cnts);
aa613de6 DB	236	}
	237	EXPORT_SYMBOL(mfd_remove_devices);
	238
fa1df691	239	int mfd_clone_cell(const char cell, const char *clones, size_t n_clones)
a9bbba99 AS	240	{
	241	struct mfd_cell cell_entry;
	242	struct device *dev;
	243	struct platform_device *pdev;
fa1df691	244	int i;
a9bbba99 AS	245
	246	/* fetch the parent cell's device (should already be registered!) */
	247	dev = bus_find_device_by_name(&platform_bus_type, NULL, cell);
	248	if (!dev) {
	249	printk(KERN_ERR "failed to find device for cell %s\n", cell);
	250	return -ENODEV;
	251	}
	252	pdev = to_platform_device(dev);
	253	memcpy(&cell_entry, mfd_get_cell(pdev), sizeof(cell_entry));
	254
	255	WARN_ON(!cell_entry.enable);
	256
fa1df691 AS	257	for (i = 0; i < n_clones; i++) {
	258	cell_entry.name = clones[i];
	259	/* don't give up if a single call fails; just report error */
0848c94f MB	260	if (mfd_add_device(pdev->dev.parent, -1, &cell_entry, NULL, 0,
0848c94f MB	261	NULL))
fa1df691 AS	262	dev_err(dev, "failed to create platform device '%s'\n",
	263	clones[i]);
	264	}
a9bbba99	265
fa1df691	266	return 0;
a9bbba99	267	}
fa1df691	268	EXPORT_SYMBOL(mfd_clone_cell);
a9bbba99	269
aa613de6 DB	270	MODULE_LICENSE("GPL");
aa613de6 DB	271	MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");