[linux-2.6-block.git] / drivers / mmc / core / sdio_bus.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  linux/drivers/mmc/core/sdio_bus.c
 *
 *  Copyright 2007 Pierre Ossman
 *
 * SDIO function driver model
 */

#include <linux/device.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/pm_runtime.h>
#include <linux/pm_domain.h>
#include <linux/acpi.h>

#include <linux/mmc/card.h>
#include <linux/mmc/host.h>
#include <linux/mmc/sdio_func.h>
#include <linux/of.h>

#include "core.h"
#include "card.h"
#include "sdio_cis.h"
#include "sdio_bus.h"

#define to_sdio_driver(d)	container_of(d, struct sdio_driver, drv)

/* show configuration fields */
#define sdio_config_attr(field, format_string, args...)			\
static ssize_t								\
field##_show(struct device *dev, struct device_attribute *attr, char *buf)				\
{									\
	struct sdio_func *func;						\
									\
	func = dev_to_sdio_func (dev);					\
	return sprintf(buf, format_string, args);			\
}									\
static DEVICE_ATTR_RO(field)

sdio_config_attr(class, "0x%02x\n", func->class);
sdio_config_attr(vendor, "0x%04x\n", func->vendor);
sdio_config_attr(device, "0x%04x\n", func->device);
sdio_config_attr(revision, "%u.%u\n", func->major_rev, func->minor_rev);
sdio_config_attr(modalias, "sdio:c%02Xv%04Xd%04X\n", func->class, func->vendor, func->device);

#define sdio_info_attr(num)									\
static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf)	\
{												\
	struct sdio_func *func = dev_to_sdio_func(dev);						\
												\
	if (num > func->num_info)								\
		return -ENODATA;								\
	if (!func->info[num-1][0])								\
		return 0;									\
	return sprintf(buf, "%s\n", func->info[num-1]);						\
}												\
static DEVICE_ATTR_RO(info##num)

sdio_info_attr(1);
sdio_info_attr(2);
sdio_info_attr(3);
sdio_info_attr(4);

static struct attribute *sdio_dev_attrs[] = {
	&dev_attr_class.attr,
	&dev_attr_vendor.attr,
	&dev_attr_device.attr,
	&dev_attr_revision.attr,
	&dev_attr_info1.attr,
	&dev_attr_info2.attr,
	&dev_attr_info3.attr,
	&dev_attr_info4.attr,
	&dev_attr_modalias.attr,
	NULL,
};
ATTRIBUTE_GROUPS(sdio_dev);

static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
	const struct sdio_device_id *id)
{
	if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
		return NULL;
	if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
		return NULL;
	if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
		return NULL;
	return id;
}

static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
	struct sdio_driver *sdrv)
{
	const struct sdio_device_id *ids;

	ids = sdrv->id_table;

	if (ids) {
		while (ids->class || ids->vendor || ids->device) {
			if (sdio_match_one(func, ids))
				return ids;
			ids++;
		}
	}

	return NULL;
}

static int sdio_bus_match(struct device *dev, struct device_driver *drv)
{
	struct sdio_func *func = dev_to_sdio_func(dev);
	struct sdio_driver *sdrv = to_sdio_driver(drv);

	if (sdio_match_device(func, sdrv))
		return 1;

	return 0;
}

static int
sdio_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct sdio_func *func = dev_to_sdio_func(dev);
	unsigned int i;

	if (add_uevent_var(env,
			"SDIO_CLASS=%02X", func->class))
		return -ENOMEM;

	if (add_uevent_var(env, 
			"SDIO_ID=%04X:%04X", func->vendor, func->device))
		return -ENOMEM;

	if (add_uevent_var(env,
			"SDIO_REVISION=%u.%u", func->major_rev, func->minor_rev))
		return -ENOMEM;

	for (i = 0; i < func->num_info; i++) {
		if (add_uevent_var(env, "SDIO_INFO%u=%s", i+1, func->info[i]))
			return -ENOMEM;
	}

	if (add_uevent_var(env,
			"MODALIAS=sdio:c%02Xv%04Xd%04X",
			func->class, func->vendor, func->device))
		return -ENOMEM;

	return 0;
}

static int sdio_bus_probe(struct device *dev)
{
	struct sdio_driver *drv = to_sdio_driver(dev->driver);
	struct sdio_func *func = dev_to_sdio_func(dev);
	const struct sdio_device_id *id;
	int ret;

	id = sdio_match_device(func, drv);
	if (!id)
		return -ENODEV;

	ret = dev_pm_domain_attach(dev, false);
	if (ret)
		return ret;

	atomic_inc(&func->card->sdio_funcs_probed);

	/* Unbound SDIO functions are always suspended.
	 * During probe, the function is set active and the usage count
	 * is incremented.  If the driver supports runtime PM,
	 * it should call pm_runtime_put_noidle() in its probe routine and
	 * pm_runtime_get_noresume() in its remove routine.
	 */
	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) {
		ret = pm_runtime_get_sync(dev);
		if (ret < 0)
			goto disable_runtimepm;
	}

	/* Set the default block size so the driver is sure it's something
	 * sensible. */
	sdio_claim_host(func);
	if (mmc_card_removed(func->card))
		ret = -ENOMEDIUM;
	else
		ret = sdio_set_block_size(func, 0);
	sdio_release_host(func);
	if (ret)
		goto disable_runtimepm;

	ret = drv->probe(func, id);
	if (ret)
		goto disable_runtimepm;

	return 0;

disable_runtimepm:
	atomic_dec(&func->card->sdio_funcs_probed);
	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
		pm_runtime_put_noidle(dev);
	dev_pm_domain_detach(dev, false);
	return ret;
}

static int sdio_bus_remove(struct device *dev)
{
	struct sdio_driver *drv = to_sdio_driver(dev->driver);
	struct sdio_func *func = dev_to_sdio_func(dev);

	/* Make sure card is powered before invoking ->remove() */
	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
		pm_runtime_get_sync(dev);

	drv->remove(func);
	atomic_dec(&func->card->sdio_funcs_probed);

	if (func->irq_handler) {
		pr_warn("WARNING: driver %s did not remove its interrupt handler!\n",
			drv->name);
		sdio_claim_host(func);
		sdio_release_irq(func);
		sdio_release_host(func);
	}

	/* First, undo the increment made directly above */
	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
		pm_runtime_put_noidle(dev);

	/* Then undo the runtime PM settings in sdio_bus_probe() */
	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
		pm_runtime_put_sync(dev);

	dev_pm_domain_detach(dev, false);

	return 0;
}

static const struct dev_pm_ops sdio_bus_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(pm_generic_suspend, pm_generic_resume)
	SET_RUNTIME_PM_OPS(
		pm_generic_runtime_suspend,
		pm_generic_runtime_resume,
		NULL
	)
};

static struct bus_type sdio_bus_type = {
	.name		= "sdio",
	.dev_groups	= sdio_dev_groups,
	.match		= sdio_bus_match,
	.uevent		= sdio_bus_uevent,
	.probe		= sdio_bus_probe,
	.remove		= sdio_bus_remove,
	.pm		= &sdio_bus_pm_ops,
};

int sdio_register_bus(void)
{
	return bus_register(&sdio_bus_type);
}

void sdio_unregister_bus(void)
{
	bus_unregister(&sdio_bus_type);
}

/**
 *	sdio_register_driver - register a function driver
 *	@drv: SDIO function driver
 */
int sdio_register_driver(struct sdio_driver *drv)
{
	drv->drv.name = drv->name;
	drv->drv.bus = &sdio_bus_type;
	return driver_register(&drv->drv);
}
EXPORT_SYMBOL_GPL(sdio_register_driver);

/**
 *	sdio_unregister_driver - unregister a function driver
 *	@drv: SDIO function driver
 */
void sdio_unregister_driver(struct sdio_driver *drv)
{
	drv->drv.bus = &sdio_bus_type;
	driver_unregister(&drv->drv);
}
EXPORT_SYMBOL_GPL(sdio_unregister_driver);

static void sdio_release_func(struct device *dev)
{
	struct sdio_func *func = dev_to_sdio_func(dev);

	sdio_free_func_cis(func);

	kfree(func->info);
	kfree(func->tmpbuf);
	kfree(func);
}

/*
 * Allocate and initialise a new SDIO function structure.
 */
struct sdio_func *sdio_alloc_func(struct mmc_card *card)
{
	struct sdio_func *func;

	func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
	if (!func)
		return ERR_PTR(-ENOMEM);

	/*
	 * allocate buffer separately to make sure it's properly aligned for
	 * DMA usage (incl. 64 bit DMA)
	 */
	func->tmpbuf = kmalloc(4, GFP_KERNEL);
	if (!func->tmpbuf) {
		kfree(func);
		return ERR_PTR(-ENOMEM);
	}

	func->card = card;

	device_initialize(&func->dev);

	func->dev.parent = &card->dev;
	func->dev.bus = &sdio_bus_type;
	func->dev.release = sdio_release_func;

	return func;
}

#ifdef CONFIG_ACPI
static void sdio_acpi_set_handle(struct sdio_func *func)
{
	struct mmc_host *host = func->card->host;
	u64 addr = ((u64)host->slotno << 16) | func->num;

	acpi_preset_companion(&func->dev, ACPI_COMPANION(host->parent), addr);
}
#else
static inline void sdio_acpi_set_handle(struct sdio_func *func) {}
#endif

static void sdio_set_of_node(struct sdio_func *func)
{
	struct mmc_host *host = func->card->host;

	func->dev.of_node = mmc_of_find_child_device(host, func->num);
}

/*
 * Register a new SDIO function with the driver model.
 */
int sdio_add_func(struct sdio_func *func)
{
	int ret;

	dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);

	sdio_set_of_node(func);
	sdio_acpi_set_handle(func);
	device_enable_async_suspend(&func->dev);
	ret = device_add(&func->dev);
	if (ret == 0)
		sdio_func_set_present(func);

	return ret;
}

/*
 * Unregister a SDIO function with the driver model, and
 * (eventually) free it.
 * This function can be called through error paths where sdio_add_func() was
 * never executed (because a failure occurred at an earlier point).
 */
void sdio_remove_func(struct sdio_func *func)
{
	if (!sdio_func_present(func))
		return;

	device_del(&func->dev);
	of_node_put(func->dev.of_node);
	put_device(&func->dev);
}
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
e29a7d73 PO	2	/*
	3	* linux/drivers/mmc/core/sdio_bus.c
	4	*
	5	* Copyright 2007 Pierre Ossman
	6	*
e29a7d73 PO	7	* SDIO function driver model
	8	*/
	9
	10	#include <linux/device.h>
	11	#include <linux/err.h>
3ef77af1	12	#include <linux/export.h>
5a0e3ad6	13	#include <linux/slab.h>
80fd933c	14	#include <linux/pm_runtime.h>
f48c767c	15	#include <linux/pm_domain.h>
eed222ac	16	#include <linux/acpi.h>
e29a7d73 PO	17
e29a7d73 PO	18	#include <linux/mmc/card.h>
ed919b01	19	#include <linux/mmc/host.h>
e29a7d73	20	#include <linux/mmc/sdio_func.h>
25185f3f	21	#include <linux/of.h>
e29a7d73	22
25185f3f	23	#include "core.h"
4facdde1	24	#include "card.h"
b1538bcf	25	#include "sdio_cis.h"
e29a7d73 PO	26	#include "sdio_bus.h"
e29a7d73 PO	27
433b7b12 UH	28	#define to_sdio_driver(d) container_of(d, struct sdio_driver, drv)
433b7b12 UH	29
bcfe66e2	30	/* show configuration fields */
b91ec1dc	31	#define sdio_config_attr(field, format_string, args...) \
bcfe66e2 PO	32	static ssize_t \
	33	field##_show(struct device dev, struct device_attribute attr, char *buf) \
	34	{ \
	35	struct sdio_func *func; \
	36	\
	37	func = dev_to_sdio_func (dev); \
b91ec1dc	38	return sprintf(buf, format_string, args); \
f24fc57b GKH	39	} \
f24fc57b GKH	40	static DEVICE_ATTR_RO(field)
bcfe66e2	41
b91ec1dc PR	42	sdio_config_attr(class, "0x%02x\n", func->class);
	43	sdio_config_attr(vendor, "0x%04x\n", func->vendor);
	44	sdio_config_attr(device, "0x%04x\n", func->device);
b698f6ab	45	sdio_config_attr(revision, "%u.%u\n", func->major_rev, func->minor_rev);
b91ec1dc	46	sdio_config_attr(modalias, "sdio:c%02Xv%04Xd%04X\n", func->class, func->vendor, func->device);
f24fc57b	47
b698f6ab PR	48	#define sdio_info_attr(num) \
	49	static ssize_t info##num##_show(struct device dev, struct device_attribute attr, char *buf) \
	50	{ \
	51	struct sdio_func *func = dev_to_sdio_func(dev); \
	52	\
	53	if (num > func->num_info) \
	54	return -ENODATA; \
	55	if (!func->info[num-1][0]) \
	56	return 0; \
	57	return sprintf(buf, "%s\n", func->info[num-1]); \
	58	} \
	59	static DEVICE_ATTR_RO(info##num)
	60
	61	sdio_info_attr(1);
	62	sdio_info_attr(2);
	63	sdio_info_attr(3);
	64	sdio_info_attr(4);
	65
f24fc57b GKH	66	static struct attribute *sdio_dev_attrs[] = {
	67	&dev_attr_class.attr,
	68	&dev_attr_vendor.attr,
	69	&dev_attr_device.attr,
b698f6ab PR	70	&dev_attr_revision.attr,
	71	&dev_attr_info1.attr,
	72	&dev_attr_info2.attr,
	73	&dev_attr_info3.attr,
	74	&dev_attr_info4.attr,
f24fc57b GKH	75	&dev_attr_modalias.attr,
f24fc57b GKH	76	NULL,
bcfe66e2	77	};
f24fc57b	78	ATTRIBUTE_GROUPS(sdio_dev);
bcfe66e2	79
3b38bea0 PO	80	static const struct sdio_device_id sdio_match_one(struct sdio_func func,
	81	const struct sdio_device_id *id)
	82	{
	83	if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
	84	return NULL;
	85	if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
	86	return NULL;
	87	if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
	88	return NULL;
	89	return id;
	90	}
	91
	92	static const struct sdio_device_id sdio_match_device(struct sdio_func func,
	93	struct sdio_driver *sdrv)
	94	{
	95	const struct sdio_device_id *ids;
	96
	97	ids = sdrv->id_table;
	98
	99	if (ids) {
	100	while (ids->class \|\| ids->vendor \|\| ids->device) {
	101	if (sdio_match_one(func, ids))
	102	return ids;
	103	ids++;
	104	}
	105	}
	106
	107	return NULL;
	108	}
e29a7d73	109
e29a7d73 PO	110	static int sdio_bus_match(struct device dev, struct device_driver drv)
e29a7d73 PO	111	{
3b38bea0 PO	112	struct sdio_func *func = dev_to_sdio_func(dev);
	113	struct sdio_driver *sdrv = to_sdio_driver(drv);
	114
	115	if (sdio_match_device(func, sdrv))
	116	return 1;
	117
	118	return 0;
e29a7d73 PO	119	}
	120
	121	static int
7ac0326c	122	sdio_bus_uevent(struct device dev, struct kobj_uevent_env env)
e29a7d73	123	{
d59b66c7	124	struct sdio_func *func = dev_to_sdio_func(dev);
b698f6ab	125	unsigned int i;
d59b66c7	126
7ac0326c	127	if (add_uevent_var(env,
d59b66c7 PO	128	"SDIO_CLASS=%02X", func->class))
	129	return -ENOMEM;
	130
7ac0326c	131	if (add_uevent_var(env,
d59b66c7 PO	132	"SDIO_ID=%04X:%04X", func->vendor, func->device))
	133	return -ENOMEM;
	134
b698f6ab PR	135	if (add_uevent_var(env,
	136	"SDIO_REVISION=%u.%u", func->major_rev, func->minor_rev))
	137	return -ENOMEM;
	138
	139	for (i = 0; i < func->num_info; i++) {
	140	if (add_uevent_var(env, "SDIO_INFO%u=%s", i+1, func->info[i]))
	141	return -ENOMEM;
	142	}
	143
7ac0326c	144	if (add_uevent_var(env,
d59b66c7 PO	145	"MODALIAS=sdio:c%02Xv%04Xd%04X",
	146	func->class, func->vendor, func->device))
	147	return -ENOMEM;
	148
e29a7d73 PO	149	return 0;
	150	}
	151
	152	static int sdio_bus_probe(struct device *dev)
	153	{
3b38bea0 PO	154	struct sdio_driver *drv = to_sdio_driver(dev->driver);
	155	struct sdio_func *func = dev_to_sdio_func(dev);
	156	const struct sdio_device_id *id;
9a08f82b	157	int ret;
3b38bea0 PO	158
	159	id = sdio_match_device(func, drv);
	160	if (!id)
	161	return -ENODEV;
	162
1ef48e3d	163	ret = dev_pm_domain_attach(dev, false);
d23fc022	164	if (ret)
1ef48e3d UH	165	return ret;
1ef48e3d UH	166
2ac55d5e UH	167	atomic_inc(&func->card->sdio_funcs_probed);
2ac55d5e UH	168
40bba0c1 OBC	169	/* Unbound SDIO functions are always suspended.
	170	* During probe, the function is set active and the usage count
	171	* is incremented. If the driver supports runtime PM,
	172	* it should call pm_runtime_put_noidle() in its probe routine and
	173	* pm_runtime_get_noresume() in its remove routine.
	174	*/
ed919b01 OBC	175	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) {
	176	ret = pm_runtime_get_sync(dev);
	177	if (ret < 0)
3bffb800	178	goto disable_runtimepm;
ed919b01	179	}
40bba0c1	180
9a08f82b DV	181	/* Set the default block size so the driver is sure it's something
	182	* sensible. */
	183	sdio_claim_host(func);
2ac55d5e UH	184	if (mmc_card_removed(func->card))
	185	ret = -ENOMEDIUM;
	186	else
	187	ret = sdio_set_block_size(func, 0);
9a08f82b DV	188	sdio_release_host(func);
9a08f82b DV	189	if (ret)
40bba0c1 OBC	190	goto disable_runtimepm;
	191
	192	ret = drv->probe(func, id);
	193	if (ret)
	194	goto disable_runtimepm;
	195
	196	return 0;
9a08f82b	197
40bba0c1	198	disable_runtimepm:
2ac55d5e	199	atomic_dec(&func->card->sdio_funcs_probed);
ed919b01 OBC	200	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
ed919b01 OBC	201	pm_runtime_put_noidle(dev);
1ef48e3d	202	dev_pm_domain_detach(dev, false);
40bba0c1	203	return ret;
e29a7d73 PO	204	}
	205
	206	static int sdio_bus_remove(struct device *dev)
	207	{
3b38bea0 PO	208	struct sdio_driver *drv = to_sdio_driver(dev->driver);
3b38bea0 PO	209	struct sdio_func *func = dev_to_sdio_func(dev);
40bba0c1 OBC	210
40bba0c1 OBC	211	/* Make sure card is powered before invoking ->remove() */
ecc02441 OBC	212	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
ecc02441 OBC	213	pm_runtime_get_sync(dev);
3b38bea0 PO	214
3b38bea0 PO	215	drv->remove(func);
2ac55d5e	216	atomic_dec(&func->card->sdio_funcs_probed);
3b38bea0	217
d1496c39	218	if (func->irq_handler) {
6606110d JP	219	pr_warn("WARNING: driver %s did not remove its interrupt handler!\n",
6606110d JP	220	drv->name);
d1496c39 NP	221	sdio_claim_host(func);
	222	sdio_release_irq(func);
	223	sdio_release_host(func);
	224	}
	225
40bba0c1	226	/* First, undo the increment made directly above */
ed919b01 OBC	227	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
ed919b01 OBC	228	pm_runtime_put_noidle(dev);
40bba0c1 OBC	229
40bba0c1 OBC	230	/* Then undo the runtime PM settings in sdio_bus_probe() */
ed919b01	231	if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
297c7f2f	232	pm_runtime_put_sync(dev);
40bba0c1	233
1ef48e3d UH	234	dev_pm_domain_detach(dev, false);
1ef48e3d UH	235
7e926f42	236	return 0;
e29a7d73 PO	237	}
e29a7d73 PO	238
80fd933c	239	static const struct dev_pm_ops sdio_bus_pm_ops = {
573185cc	240	SET_SYSTEM_SLEEP_PM_OPS(pm_generic_suspend, pm_generic_resume)
80fd933c OBC	241	SET_RUNTIME_PM_OPS(
	242	pm_generic_runtime_suspend,
	243	pm_generic_runtime_resume,
45f0a85c	244	NULL
80fd933c OBC	245	)
	246	};
	247
e29a7d73 PO	248	static struct bus_type sdio_bus_type = {
e29a7d73 PO	249	.name = "sdio",
f24fc57b	250	.dev_groups = sdio_dev_groups,
e29a7d73 PO	251	.match = sdio_bus_match,
	252	.uevent = sdio_bus_uevent,
	253	.probe = sdio_bus_probe,
	254	.remove = sdio_bus_remove,
d99903ca	255	.pm = &sdio_bus_pm_ops,
e29a7d73 PO	256	};
	257
	258	int sdio_register_bus(void)
	259	{
	260	return bus_register(&sdio_bus_type);
	261	}
	262
	263	void sdio_unregister_bus(void)
	264	{
	265	bus_unregister(&sdio_bus_type);
	266	}
	267
f76c8515 PO	268	/**
	269	* sdio_register_driver - register a function driver
	270	* @drv: SDIO function driver
	271	*/
	272	int sdio_register_driver(struct sdio_driver *drv)
	273	{
	274	drv->drv.name = drv->name;
	275	drv->drv.bus = &sdio_bus_type;
	276	return driver_register(&drv->drv);
	277	}
	278	EXPORT_SYMBOL_GPL(sdio_register_driver);
	279
	280	/**
	281	* sdio_unregister_driver - unregister a function driver
	282	* @drv: SDIO function driver
	283	*/
	284	void sdio_unregister_driver(struct sdio_driver *drv)
	285	{
	286	drv->drv.bus = &sdio_bus_type;
	287	driver_unregister(&drv->drv);
	288	}
	289	EXPORT_SYMBOL_GPL(sdio_unregister_driver);
	290
e29a7d73 PO	291	static void sdio_release_func(struct device *dev)
	292	{
	293	struct sdio_func *func = dev_to_sdio_func(dev);
b1538bcf	294
1a632f8c	295	sdio_free_func_cis(func);
e29a7d73	296
4c42d6cc	297	kfree(func->info);
5ef1ecf0	298	kfree(func->tmpbuf);
e29a7d73 PO	299	kfree(func);
	300	}
	301
	302	/*
	303	* Allocate and initialise a new SDIO function structure.
	304	*/
	305	struct sdio_func sdio_alloc_func(struct mmc_card card)
	306	{
	307	struct sdio_func *func;
	308
9f2fcf99	309	func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
e29a7d73 PO	310	if (!func)
	311	return ERR_PTR(-ENOMEM);
	312
5ef1ecf0 HK	313	/*
	314	* allocate buffer separately to make sure it's properly aligned for
	315	* DMA usage (incl. 64 bit DMA)
	316	*/
	317	func->tmpbuf = kmalloc(4, GFP_KERNEL);
	318	if (!func->tmpbuf) {
	319	kfree(func);
	320	return ERR_PTR(-ENOMEM);
	321	}
	322
e29a7d73 PO	323	func->card = card;
	324
	325	device_initialize(&func->dev);
	326
	327	func->dev.parent = &card->dev;
	328	func->dev.bus = &sdio_bus_type;
	329	func->dev.release = sdio_release_func;
	330
	331	return func;
	332	}
	333
eed222ac AL	334	#ifdef CONFIG_ACPI
	335	static void sdio_acpi_set_handle(struct sdio_func *func)
	336	{
	337	struct mmc_host *host = func->card->host;
51d34606	338	u64 addr = ((u64)host->slotno << 16) \| func->num;
eed222ac	339
9c5ad36d	340	acpi_preset_companion(&func->dev, ACPI_COMPANION(host->parent), addr);
eed222ac AL	341	}
	342	#else
	343	static inline void sdio_acpi_set_handle(struct sdio_func *func) {}
	344	#endif
	345
25185f3f SH	346	static void sdio_set_of_node(struct sdio_func *func)
	347	{
	348	struct mmc_host *host = func->card->host;
	349
	350	func->dev.of_node = mmc_of_find_child_device(host, func->num);
	351	}
	352
e29a7d73 PO	353	/*
	354	* Register a new SDIO function with the driver model.
	355	*/
	356	int sdio_add_func(struct sdio_func *func)
	357	{
	358	int ret;
	359
d1b26863	360	dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
e29a7d73	361
25185f3f	362	sdio_set_of_node(func);
eed222ac	363	sdio_acpi_set_handle(func);
ec076cd2	364	device_enable_async_suspend(&func->dev);
e29a7d73	365	ret = device_add(&func->dev);
1ef48e3d	366	if (ret == 0)
e29a7d73 PO	367	sdio_func_set_present(func);
	368
	369	return ret;
	370	}
	371
	372	/*
	373	* Unregister a SDIO function with the driver model, and
	374	* (eventually) free it.
3d10a1ba DD	375	* This function can be called through error paths where sdio_add_func() was
3d10a1ba DD	376	* never executed (because a failure occurred at an earlier point).
e29a7d73 PO	377	*/
	378	void sdio_remove_func(struct sdio_func *func)
	379	{
3d10a1ba DD	380	if (!sdio_func_present(func))
3d10a1ba DD	381	return;
e29a7d73	382
3d10a1ba	383	device_del(&func->dev);
25185f3f	384	of_node_put(func->dev.of_node);
e29a7d73 PO	385	put_device(&func->dev);
	386	}
	387