[deliverable/linux.git] / drivers / usb / phy / phy.c

/*
 * phy.c -- USB phy handling
 *
 * Copyright (C) 2004-2013 Texas Instruments
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/err.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/of.h>

#include <linux/usb/phy.h>

static LIST_HEAD(phy_list);
static LIST_HEAD(phy_bind_list);
static DEFINE_SPINLOCK(phy_lock);

static struct usb_phy *__usb_find_phy(struct list_head *list,
	enum usb_phy_type type)
{
	struct usb_phy  *phy = NULL;

	list_for_each_entry(phy, list, head) {
		if (phy->type != type)
			continue;

		return phy;
	}

	return ERR_PTR(-ENODEV);
}

static struct usb_phy *__usb_find_phy_dev(struct device *dev,
	struct list_head *list, u8 index)
{
	struct usb_phy_bind *phy_bind = NULL;

	list_for_each_entry(phy_bind, list, list) {
		if (!(strcmp(phy_bind->dev_name, dev_name(dev))) &&
				phy_bind->index == index) {
			if (phy_bind->phy)
				return phy_bind->phy;
			else
				return ERR_PTR(-EPROBE_DEFER);
		}
	}

	return ERR_PTR(-ENODEV);
}

static struct usb_phy *__of_usb_find_phy(struct device_node *node)
{
	struct usb_phy  *phy;

	list_for_each_entry(phy, &phy_list, head) {
		if (node != phy->dev->of_node)
			continue;

		return phy;
	}

	return ERR_PTR(-ENODEV);
}

static void devm_usb_phy_release(struct device *dev, void *res)
{
	struct usb_phy *phy = *(struct usb_phy **)res;

	usb_put_phy(phy);
}

static int devm_usb_phy_match(struct device *dev, void *res, void *match_data)
{
	return res == match_data;
}

/**
 * devm_usb_get_phy - find the USB PHY
 * @dev - device that requests this phy
 * @type - the type of the phy the controller requires
 *
 * Gets the phy using usb_get_phy(), and associates a device with it using
 * devres. On driver detach, release function is invoked on the devres data,
 * then, devres data is freed.
 *
 * For use by USB host and peripheral drivers.
 */
struct usb_phy *devm_usb_get_phy(struct device *dev, enum usb_phy_type type)
{
	struct usb_phy **ptr, *phy;

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

	phy = usb_get_phy(type);
	if (!IS_ERR(phy)) {
		*ptr = phy;
		devres_add(dev, ptr);
	} else
		devres_free(ptr);

	return phy;
}
EXPORT_SYMBOL_GPL(devm_usb_get_phy);

/**
 * usb_get_phy - find the USB PHY
 * @type - the type of the phy the controller requires
 *
 * Returns the phy driver, after getting a refcount to it; or
 * -ENODEV if there is no such phy.  The caller is responsible for
 * calling usb_put_phy() to release that count.
 *
 * For use by USB host and peripheral drivers.
 */
struct usb_phy *usb_get_phy(enum usb_phy_type type)
{
	struct usb_phy	*phy = NULL;
	unsigned long	flags;

	spin_lock_irqsave(&phy_lock, flags);

	phy = __usb_find_phy(&phy_list, type);
	if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
		pr_debug("PHY: unable to find transceiver of type %s\n",
			usb_phy_type_string(type));
		if (!IS_ERR(phy))
			phy = ERR_PTR(-ENODEV);

		goto err0;
	}

	get_device(phy->dev);

err0:
	spin_unlock_irqrestore(&phy_lock, flags);

	return phy;
}
EXPORT_SYMBOL_GPL(usb_get_phy);

/**
 * devm_usb_get_phy_by_phandle - find the USB PHY by phandle
 * @dev - device that requests this phy
 * @phandle - name of the property holding the phy phandle value
 * @index - the index of the phy
 *
 * Returns the phy driver associated with the given phandle value,
 * after getting a refcount to it, -ENODEV if there is no such phy or
 * -EPROBE_DEFER if there is a phandle to the phy, but the device is
 * not yet loaded. While at that, it also associates the device with
 * the phy using devres. On driver detach, release function is invoked
 * on the devres data, then, devres data is freed.
 *
 * For use by USB host and peripheral drivers.
 */
struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
	const char *phandle, u8 index)
{
	struct usb_phy	*phy = ERR_PTR(-ENOMEM), **ptr;
	unsigned long	flags;
	struct device_node *node;

	if (!dev->of_node) {
		dev_dbg(dev, "device does not have a device node entry\n");
		return ERR_PTR(-EINVAL);
	}

	node = of_parse_phandle(dev->of_node, phandle, index);
	if (!node) {
		dev_dbg(dev, "failed to get %s phandle in %s node\n", phandle,
			dev->of_node->full_name);
		return ERR_PTR(-ENODEV);
	}

	ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
	if (!ptr) {
		dev_dbg(dev, "failed to allocate memory for devres\n");
		goto err0;
	}

	spin_lock_irqsave(&phy_lock, flags);

	phy = __of_usb_find_phy(node);
	if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
		phy = ERR_PTR(-EPROBE_DEFER);
		devres_free(ptr);
		goto err1;
	}

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

	get_device(phy->dev);

err1:
	spin_unlock_irqrestore(&phy_lock, flags);

err0:
	of_node_put(node);

	return phy;
}
EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle);

/**
 * usb_get_phy_dev - find the USB PHY
 * @dev - device that requests this phy
 * @index - the index of the phy
 *
 * Returns the phy driver, after getting a refcount to it; or
 * -ENODEV if there is no such phy.  The caller is responsible for
 * calling usb_put_phy() to release that count.
 *
 * For use by USB host and peripheral drivers.
 */
struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index)
{
	struct usb_phy	*phy = NULL;
	unsigned long	flags;

	spin_lock_irqsave(&phy_lock, flags);

	phy = __usb_find_phy_dev(dev, &phy_bind_list, index);
	if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
		dev_dbg(dev, "unable to find transceiver\n");
		if (!IS_ERR(phy))
			phy = ERR_PTR(-ENODEV);

		goto err0;
	}

	get_device(phy->dev);

err0:
	spin_unlock_irqrestore(&phy_lock, flags);

	return phy;
}
EXPORT_SYMBOL_GPL(usb_get_phy_dev);

/**
 * devm_usb_get_phy_dev - find the USB PHY using device ptr and index
 * @dev - device that requests this phy
 * @index - the index of the phy
 *
 * Gets the phy using usb_get_phy_dev(), and associates a device with it using
 * devres. On driver detach, release function is invoked on the devres data,
 * then, devres data is freed.
 *
 * For use by USB host and peripheral drivers.
 */
struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index)
{
	struct usb_phy **ptr, *phy;

	ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
	if (!ptr)
		return NULL;

	phy = usb_get_phy_dev(dev, index);
	if (!IS_ERR(phy)) {
		*ptr = phy;
		devres_add(dev, ptr);
	} else
		devres_free(ptr);

	return phy;
}
EXPORT_SYMBOL_GPL(devm_usb_get_phy_dev);

/**
 * devm_usb_put_phy - release the USB PHY
 * @dev - device that wants to release this phy
 * @phy - the phy returned by devm_usb_get_phy()
 *
 * destroys the devres associated with this phy and invokes usb_put_phy
 * to release the phy.
 *
 * For use by USB host and peripheral drivers.
 */
void devm_usb_put_phy(struct device *dev, struct usb_phy *phy)
{
	int r;

	r = devres_destroy(dev, devm_usb_phy_release, devm_usb_phy_match, phy);
	dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
}
EXPORT_SYMBOL_GPL(devm_usb_put_phy);

/**
 * usb_put_phy - release the USB PHY
 * @x: the phy returned by usb_get_phy()
 *
 * Releases a refcount the caller received from usb_get_phy().
 *
 * For use by USB host and peripheral drivers.
 */
void usb_put_phy(struct usb_phy *x)
{
	if (x) {
		struct module *owner = x->dev->driver->owner;

		put_device(x->dev);
		module_put(owner);
	}
}
EXPORT_SYMBOL_GPL(usb_put_phy);

/**
 * usb_add_phy - declare the USB PHY
 * @x: the USB phy to be used; or NULL
 * @type - the type of this PHY
 *
 * This call is exclusively for use by phy drivers, which
 * coordinate the activities of drivers for host and peripheral
 * controllers, and in some cases for VBUS current regulation.
 */
int usb_add_phy(struct usb_phy *x, enum usb_phy_type type)
{
	int		ret = 0;
	unsigned long	flags;
	struct usb_phy	*phy;

	if (x->type != USB_PHY_TYPE_UNDEFINED) {
		dev_err(x->dev, "not accepting initialized PHY %s\n", x->label);
		return -EINVAL;
	}

	ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);

	spin_lock_irqsave(&phy_lock, flags);

	list_for_each_entry(phy, &phy_list, head) {
		if (phy->type == type) {
			ret = -EBUSY;
			dev_err(x->dev, "transceiver type %s already exists\n",
						usb_phy_type_string(type));
			goto out;
		}
	}

	x->type = type;
	list_add_tail(&x->head, &phy_list);

out:
	spin_unlock_irqrestore(&phy_lock, flags);
	return ret;
}
EXPORT_SYMBOL_GPL(usb_add_phy);

/**
 * usb_add_phy_dev - declare the USB PHY
 * @x: the USB phy to be used; or NULL
 *
 * This call is exclusively for use by phy drivers, which
 * coordinate the activities of drivers for host and peripheral
 * controllers, and in some cases for VBUS current regulation.
 */
int usb_add_phy_dev(struct usb_phy *x)
{
	struct usb_phy_bind *phy_bind;
	unsigned long flags;

	if (!x->dev) {
		dev_err(x->dev, "no device provided for PHY\n");
		return -EINVAL;
	}

	ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);

	spin_lock_irqsave(&phy_lock, flags);
	list_for_each_entry(phy_bind, &phy_bind_list, list)
		if (!(strcmp(phy_bind->phy_dev_name, dev_name(x->dev))))
			phy_bind->phy = x;

	list_add_tail(&x->head, &phy_list);

	spin_unlock_irqrestore(&phy_lock, flags);
	return 0;
}
EXPORT_SYMBOL_GPL(usb_add_phy_dev);

/**
 * usb_remove_phy - remove the OTG PHY
 * @x: the USB OTG PHY to be removed;
 *
 * This reverts the effects of usb_add_phy
 */
void usb_remove_phy(struct usb_phy *x)
{
	unsigned long	flags;
	struct usb_phy_bind *phy_bind;

	spin_lock_irqsave(&phy_lock, flags);
	if (x) {
		list_for_each_entry(phy_bind, &phy_bind_list, list)
			if (phy_bind->phy == x)
				phy_bind->phy = NULL;
		list_del(&x->head);
	}
	spin_unlock_irqrestore(&phy_lock, flags);
}
EXPORT_SYMBOL_GPL(usb_remove_phy);

/**
 * usb_bind_phy - bind the phy and the controller that uses the phy
 * @dev_name: the device name of the device that will bind to the phy
 * @index: index to specify the port number
 * @phy_dev_name: the device name of the phy
 *
 * Fills the phy_bind structure with the dev_name and phy_dev_name. This will
 * be used when the phy driver registers the phy and when the controller
 * requests this phy.
 *
 * To be used by platform specific initialization code.
 */
int usb_bind_phy(const char *dev_name, u8 index,
				const char *phy_dev_name)
{
	struct usb_phy_bind *phy_bind;
	unsigned long flags;

	phy_bind = kzalloc(sizeof(*phy_bind), GFP_KERNEL);
	if (!phy_bind)
		return -ENOMEM;

	phy_bind->dev_name = dev_name;
	phy_bind->phy_dev_name = phy_dev_name;
	phy_bind->index = index;

	spin_lock_irqsave(&phy_lock, flags);
	list_add_tail(&phy_bind->list, &phy_bind_list);
	spin_unlock_irqrestore(&phy_lock, flags);

	return 0;
}
EXPORT_SYMBOL_GPL(usb_bind_phy);
Commit	Line	Data
cedf8602 SH	1	/*
	2	* phy.c -- USB phy handling
	3	*
	4	* Copyright (C) 2004-2013 Texas Instruments
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*/
	11	#include <linux/kernel.h>
	12	#include <linux/export.h>
	13	#include <linux/err.h>
	14	#include <linux/device.h>
	15	#include <linux/module.h>
	16	#include <linux/slab.h>
	17	#include <linux/of.h>
	18
	19	#include <linux/usb/phy.h>
	20
	21	static LIST_HEAD(phy_list);
	22	static LIST_HEAD(phy_bind_list);
	23	static DEFINE_SPINLOCK(phy_lock);
	24
	25	static struct usb_phy __usb_find_phy(struct list_head list,
	26	enum usb_phy_type type)
	27	{
	28	struct usb_phy *phy = NULL;
	29
	30	list_for_each_entry(phy, list, head) {
	31	if (phy->type != type)
	32	continue;
	33
	34	return phy;
	35	}
	36
	37	return ERR_PTR(-ENODEV);
	38	}
	39
	40	static struct usb_phy __usb_find_phy_dev(struct device dev,
	41	struct list_head *list, u8 index)
	42	{
	43	struct usb_phy_bind *phy_bind = NULL;
	44
	45	list_for_each_entry(phy_bind, list, list) {
	46	if (!(strcmp(phy_bind->dev_name, dev_name(dev))) &&
	47	phy_bind->index == index) {
	48	if (phy_bind->phy)
	49	return phy_bind->phy;
	50	else
	51	return ERR_PTR(-EPROBE_DEFER);
	52	}
	53	}
	54
	55	return ERR_PTR(-ENODEV);
	56	}
	57
	58	static struct usb_phy __of_usb_find_phy(struct device_node node)
	59	{
	60	struct usb_phy *phy;
	61
	62	list_for_each_entry(phy, &phy_list, head) {
	63	if (node != phy->dev->of_node)
	64	continue;
65
66	return phy;
67	}
68
69	return ERR_PTR(-ENODEV);
70	}
71
72	static void devm_usb_phy_release(struct device dev, void res)
73	{
74	struct usb_phy phy = (struct usb_phy **)res;
75
76	usb_put_phy(phy);
77	}
78
79	static int devm_usb_phy_match(struct device dev, void res, void *match_data)
80	{
81	return res == match_data;
82	}
83
84	/**
85	* devm_usb_get_phy - find the USB PHY
86	* @dev - device that requests this phy
87	* @type - the type of the phy the controller requires
88	*
89	* Gets the phy using usb_get_phy(), and associates a device with it using
90	* devres. On driver detach, release function is invoked on the devres data,
91	* then, devres data is freed.
92	*
93	* For use by USB host and peripheral drivers.
94	*/
95	struct usb_phy devm_usb_get_phy(struct device dev, enum usb_phy_type type)
96	{
97	struct usb_phy *ptr, phy;
98
99	ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
100	if (!ptr)
7f4d1e7b	101	return ERR_PTR(-ENOMEM);
cedf8602 SH	102
	103	phy = usb_get_phy(type);
	104	if (!IS_ERR(phy)) {
	105	*ptr = phy;
	106	devres_add(dev, ptr);
	107	} else
	108	devres_free(ptr);
	109
	110	return phy;
	111	}
110ff6d0	112	EXPORT_SYMBOL_GPL(devm_usb_get_phy);
cedf8602 SH	113
	114	/**
	115	* usb_get_phy - find the USB PHY
	116	* @type - the type of the phy the controller requires
	117	*
	118	* Returns the phy driver, after getting a refcount to it; or
	119	* -ENODEV if there is no such phy. The caller is responsible for
	120	* calling usb_put_phy() to release that count.
	121	*
	122	* For use by USB host and peripheral drivers.
	123	*/
	124	struct usb_phy *usb_get_phy(enum usb_phy_type type)
	125	{
	126	struct usb_phy *phy = NULL;
	127	unsigned long flags;
	128
	129	spin_lock_irqsave(&phy_lock, flags);
	130
	131	phy = __usb_find_phy(&phy_list, type);
	132	if (IS_ERR(phy) \|\| !try_module_get(phy->dev->driver->owner)) {
e9d123a5	133	pr_debug("PHY: unable to find transceiver of type %s\n",
cedf8602	134	usb_phy_type_string(type));
9dc9cb0c MK	135	if (!IS_ERR(phy))
	136	phy = ERR_PTR(-ENODEV);
	137
cedf8602 SH	138	goto err0;
	139	}
	140
	141	get_device(phy->dev);
	142
	143	err0:
	144	spin_unlock_irqrestore(&phy_lock, flags);
	145
	146	return phy;
	147	}
110ff6d0	148	EXPORT_SYMBOL_GPL(usb_get_phy);
cedf8602	149
fb1928de	150	/**
cedf8602 SH	151	* devm_usb_get_phy_by_phandle - find the USB PHY by phandle
	152	* @dev - device that requests this phy
	153	* @phandle - name of the property holding the phy phandle value
	154	* @index - the index of the phy
	155	*
	156	* Returns the phy driver associated with the given phandle value,
	157	* after getting a refcount to it, -ENODEV if there is no such phy or
	158	* -EPROBE_DEFER if there is a phandle to the phy, but the device is
	159	* not yet loaded. While at that, it also associates the device with
	160	* the phy using devres. On driver detach, release function is invoked
	161	* on the devres data, then, devres data is freed.
	162	*
	163	* For use by USB host and peripheral drivers.
	164	*/
	165	struct usb_phy devm_usb_get_phy_by_phandle(struct device dev,
	166	const char *phandle, u8 index)
	167	{
	168	struct usb_phy phy = ERR_PTR(-ENOMEM), *ptr;
	169	unsigned long flags;
	170	struct device_node *node;
	171
	172	if (!dev->of_node) {
	173	dev_dbg(dev, "device does not have a device node entry\n");
	174	return ERR_PTR(-EINVAL);
	175	}
	176
	177	node = of_parse_phandle(dev->of_node, phandle, index);
	178	if (!node) {
	179	dev_dbg(dev, "failed to get %s phandle in %s node\n", phandle,
	180	dev->of_node->full_name);
	181	return ERR_PTR(-ENODEV);
	182	}
	183
	184	ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
	185	if (!ptr) {
	186	dev_dbg(dev, "failed to allocate memory for devres\n");
	187	goto err0;
	188	}
	189
	190	spin_lock_irqsave(&phy_lock, flags);
	191
	192	phy = __of_usb_find_phy(node);
	193	if (IS_ERR(phy) \|\| !try_module_get(phy->dev->driver->owner)) {
	194	phy = ERR_PTR(-EPROBE_DEFER);
	195	devres_free(ptr);
	196	goto err1;
	197	}
	198
	199	*ptr = phy;
	200	devres_add(dev, ptr);
	201
	202	get_device(phy->dev);
	203
	204	err1:
	205	spin_unlock_irqrestore(&phy_lock, flags);
	206
	207	err0:
	208	of_node_put(node);
	209
	210	return phy;
	211	}
110ff6d0	212	EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle);
cedf8602 SH	213
	214	/**
	215	* usb_get_phy_dev - find the USB PHY
	216	* @dev - device that requests this phy
	217	* @index - the index of the phy
	218	*
	219	* Returns the phy driver, after getting a refcount to it; or
	220	* -ENODEV if there is no such phy. The caller is responsible for
	221	* calling usb_put_phy() to release that count.
	222	*
	223	* For use by USB host and peripheral drivers.
	224	*/
	225	struct usb_phy usb_get_phy_dev(struct device dev, u8 index)
	226	{
	227	struct usb_phy *phy = NULL;
	228	unsigned long flags;
	229
	230	spin_lock_irqsave(&phy_lock, flags);
	231
	232	phy = __usb_find_phy_dev(dev, &phy_bind_list, index);
	233	if (IS_ERR(phy) \|\| !try_module_get(phy->dev->driver->owner)) {
e9d123a5	234	dev_dbg(dev, "unable to find transceiver\n");
2c4e3dbf AS	235	if (!IS_ERR(phy))
	236	phy = ERR_PTR(-ENODEV);
	237
cedf8602 SH	238	goto err0;
	239	}
	240
	241	get_device(phy->dev);
	242
	243	err0:
	244	spin_unlock_irqrestore(&phy_lock, flags);
	245
	246	return phy;
	247	}
110ff6d0	248	EXPORT_SYMBOL_GPL(usb_get_phy_dev);
cedf8602 SH	249
	250	/**
	251	* devm_usb_get_phy_dev - find the USB PHY using device ptr and index
	252	* @dev - device that requests this phy
	253	* @index - the index of the phy
	254	*
	255	* Gets the phy using usb_get_phy_dev(), and associates a device with it using
	256	* devres. On driver detach, release function is invoked on the devres data,
	257	* then, devres data is freed.
	258	*
	259	* For use by USB host and peripheral drivers.
	260	*/
	261	struct usb_phy devm_usb_get_phy_dev(struct device dev, u8 index)
	262	{
	263	struct usb_phy *ptr, phy;
	264
	265	ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
	266	if (!ptr)
	267	return NULL;
	268
	269	phy = usb_get_phy_dev(dev, index);
	270	if (!IS_ERR(phy)) {
	271	*ptr = phy;
	272	devres_add(dev, ptr);
	273	} else
	274	devres_free(ptr);
	275
	276	return phy;
	277	}
110ff6d0	278	EXPORT_SYMBOL_GPL(devm_usb_get_phy_dev);
cedf8602 SH	279
	280	/**
	281	* devm_usb_put_phy - release the USB PHY
	282	* @dev - device that wants to release this phy
	283	* @phy - the phy returned by devm_usb_get_phy()
	284	*
	285	* destroys the devres associated with this phy and invokes usb_put_phy
	286	* to release the phy.
	287	*
	288	* For use by USB host and peripheral drivers.
	289	*/
	290	void devm_usb_put_phy(struct device dev, struct usb_phy phy)
	291	{
	292	int r;
	293
	294	r = devres_destroy(dev, devm_usb_phy_release, devm_usb_phy_match, phy);
	295	dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
	296	}
110ff6d0	297	EXPORT_SYMBOL_GPL(devm_usb_put_phy);
cedf8602 SH	298
	299	/**
	300	* usb_put_phy - release the USB PHY
	301	* @x: the phy returned by usb_get_phy()
	302	*
	303	* Releases a refcount the caller received from usb_get_phy().
	304	*
	305	* For use by USB host and peripheral drivers.
	306	*/
	307	void usb_put_phy(struct usb_phy *x)
	308	{
	309	if (x) {
	310	struct module *owner = x->dev->driver->owner;
	311
	312	put_device(x->dev);
	313	module_put(owner);
	314	}
	315	}
110ff6d0	316	EXPORT_SYMBOL_GPL(usb_put_phy);
cedf8602 SH	317
	318	/**
	319	* usb_add_phy - declare the USB PHY
	320	* @x: the USB phy to be used; or NULL
	321	* @type - the type of this PHY
	322	*
	323	* This call is exclusively for use by phy drivers, which
	324	* coordinate the activities of drivers for host and peripheral
	325	* controllers, and in some cases for VBUS current regulation.
	326	*/
	327	int usb_add_phy(struct usb_phy *x, enum usb_phy_type type)
	328	{
	329	int ret = 0;
	330	unsigned long flags;
	331	struct usb_phy *phy;
	332
	333	if (x->type != USB_PHY_TYPE_UNDEFINED) {
	334	dev_err(x->dev, "not accepting initialized PHY %s\n", x->label);
	335	return -EINVAL;
	336	}
	337
31e32227 NZ	338	ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
31e32227 NZ	339
cedf8602 SH	340	spin_lock_irqsave(&phy_lock, flags);
	341
	342	list_for_each_entry(phy, &phy_list, head) {
	343	if (phy->type == type) {
	344	ret = -EBUSY;
	345	dev_err(x->dev, "transceiver type %s already exists\n",
	346	usb_phy_type_string(type));
	347	goto out;
	348	}
	349	}
	350
	351	x->type = type;
	352	list_add_tail(&x->head, &phy_list);
	353
	354	out:
	355	spin_unlock_irqrestore(&phy_lock, flags);
	356	return ret;
	357	}
110ff6d0	358	EXPORT_SYMBOL_GPL(usb_add_phy);
cedf8602 SH	359
	360	/**
	361	* usb_add_phy_dev - declare the USB PHY
	362	* @x: the USB phy to be used; or NULL
	363	*
	364	* This call is exclusively for use by phy drivers, which
	365	* coordinate the activities of drivers for host and peripheral
	366	* controllers, and in some cases for VBUS current regulation.
	367	*/
	368	int usb_add_phy_dev(struct usb_phy *x)
	369	{
	370	struct usb_phy_bind *phy_bind;
	371	unsigned long flags;
	372
	373	if (!x->dev) {
	374	dev_err(x->dev, "no device provided for PHY\n");
	375	return -EINVAL;
	376	}
	377
31e32227 NZ	378	ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
31e32227 NZ	379
cedf8602 SH	380	spin_lock_irqsave(&phy_lock, flags);
	381	list_for_each_entry(phy_bind, &phy_bind_list, list)
	382	if (!(strcmp(phy_bind->phy_dev_name, dev_name(x->dev))))
	383	phy_bind->phy = x;
	384
	385	list_add_tail(&x->head, &phy_list);
	386
	387	spin_unlock_irqrestore(&phy_lock, flags);
	388	return 0;
	389	}
110ff6d0	390	EXPORT_SYMBOL_GPL(usb_add_phy_dev);
cedf8602 SH	391
	392	/**
	393	* usb_remove_phy - remove the OTG PHY
	394	* @x: the USB OTG PHY to be removed;
	395	*
	396	* This reverts the effects of usb_add_phy
	397	*/
	398	void usb_remove_phy(struct usb_phy *x)
	399	{
	400	unsigned long flags;
	401	struct usb_phy_bind *phy_bind;
	402
	403	spin_lock_irqsave(&phy_lock, flags);
	404	if (x) {
	405	list_for_each_entry(phy_bind, &phy_bind_list, list)
	406	if (phy_bind->phy == x)
	407	phy_bind->phy = NULL;
	408	list_del(&x->head);
	409	}
	410	spin_unlock_irqrestore(&phy_lock, flags);
	411	}
110ff6d0	412	EXPORT_SYMBOL_GPL(usb_remove_phy);
cedf8602 SH	413
	414	/**
	415	* usb_bind_phy - bind the phy and the controller that uses the phy
	416	* @dev_name: the device name of the device that will bind to the phy
	417	* @index: index to specify the port number
	418	* @phy_dev_name: the device name of the phy
	419	*
	420	* Fills the phy_bind structure with the dev_name and phy_dev_name. This will
	421	* be used when the phy driver registers the phy and when the controller
	422	* requests this phy.
	423	*
	424	* To be used by platform specific initialization code.
	425	*/
19d8cedd	426	int usb_bind_phy(const char *dev_name, u8 index,
cedf8602 SH	427	const char *phy_dev_name)
	428	{
	429	struct usb_phy_bind *phy_bind;
	430	unsigned long flags;
	431
	432	phy_bind = kzalloc(sizeof(*phy_bind), GFP_KERNEL);
e9d123a5	433	if (!phy_bind)
cedf8602	434	return -ENOMEM;
cedf8602 SH	435
	436	phy_bind->dev_name = dev_name;
	437	phy_bind->phy_dev_name = phy_dev_name;
	438	phy_bind->index = index;
	439
	440	spin_lock_irqsave(&phy_lock, flags);
	441	list_add_tail(&phy_bind->list, &phy_bind_list);
	442	spin_unlock_irqrestore(&phy_lock, flags);
	443
	444	return 0;
	445	}
	446	EXPORT_SYMBOL_GPL(usb_bind_phy);