[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));
		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");
		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 SH	134	usb_phy_type_string(type));
	135	goto err0;
	136	}
	137
	138	get_device(phy->dev);
	139
	140	err0:
	141	spin_unlock_irqrestore(&phy_lock, flags);
	142
	143	return phy;
	144	}
110ff6d0	145	EXPORT_SYMBOL_GPL(usb_get_phy);
cedf8602	146
fb1928de	147	/**
cedf8602 SH	148	* devm_usb_get_phy_by_phandle - find the USB PHY by phandle
	149	* @dev - device that requests this phy
	150	* @phandle - name of the property holding the phy phandle value
	151	* @index - the index of the phy
	152	*
	153	* Returns the phy driver associated with the given phandle value,
	154	* after getting a refcount to it, -ENODEV if there is no such phy or
	155	* -EPROBE_DEFER if there is a phandle to the phy, but the device is
	156	* not yet loaded. While at that, it also associates the device with
	157	* the phy using devres. On driver detach, release function is invoked
	158	* on the devres data, then, devres data is freed.
	159	*
	160	* For use by USB host and peripheral drivers.
	161	*/
	162	struct usb_phy devm_usb_get_phy_by_phandle(struct device dev,
	163	const char *phandle, u8 index)
	164	{
	165	struct usb_phy phy = ERR_PTR(-ENOMEM), *ptr;
	166	unsigned long flags;
	167	struct device_node *node;
	168
	169	if (!dev->of_node) {
	170	dev_dbg(dev, "device does not have a device node entry\n");
	171	return ERR_PTR(-EINVAL);
	172	}
	173
	174	node = of_parse_phandle(dev->of_node, phandle, index);
	175	if (!node) {
	176	dev_dbg(dev, "failed to get %s phandle in %s node\n", phandle,
	177	dev->of_node->full_name);
	178	return ERR_PTR(-ENODEV);
	179	}
	180
	181	ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
	182	if (!ptr) {
	183	dev_dbg(dev, "failed to allocate memory for devres\n");
	184	goto err0;
	185	}
	186
	187	spin_lock_irqsave(&phy_lock, flags);
	188
	189	phy = __of_usb_find_phy(node);
	190	if (IS_ERR(phy) \|\| !try_module_get(phy->dev->driver->owner)) {
	191	phy = ERR_PTR(-EPROBE_DEFER);
	192	devres_free(ptr);
	193	goto err1;
	194	}
	195
	196	*ptr = phy;
	197	devres_add(dev, ptr);
	198
	199	get_device(phy->dev);
	200
	201	err1:
	202	spin_unlock_irqrestore(&phy_lock, flags);
	203
	204	err0:
	205	of_node_put(node);
	206
	207	return phy;
	208	}
110ff6d0	209	EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle);
cedf8602 SH	210
	211	/**
	212	* usb_get_phy_dev - find the USB PHY
	213	* @dev - device that requests this phy
	214	* @index - the index of the phy
	215	*
	216	* Returns the phy driver, after getting a refcount to it; or
	217	* -ENODEV if there is no such phy. The caller is responsible for
	218	* calling usb_put_phy() to release that count.
	219	*
	220	* For use by USB host and peripheral drivers.
	221	*/
	222	struct usb_phy usb_get_phy_dev(struct device dev, u8 index)
	223	{
	224	struct usb_phy *phy = NULL;
	225	unsigned long flags;
	226
	227	spin_lock_irqsave(&phy_lock, flags);
	228
	229	phy = __usb_find_phy_dev(dev, &phy_bind_list, index);
	230	if (IS_ERR(phy) \|\| !try_module_get(phy->dev->driver->owner)) {
e9d123a5	231	dev_dbg(dev, "unable to find transceiver\n");
cedf8602 SH	232	goto err0;
	233	}
	234
	235	get_device(phy->dev);
	236
	237	err0:
	238	spin_unlock_irqrestore(&phy_lock, flags);
	239
	240	return phy;
	241	}
110ff6d0	242	EXPORT_SYMBOL_GPL(usb_get_phy_dev);
cedf8602 SH	243
	244	/**
	245	* devm_usb_get_phy_dev - find the USB PHY using device ptr and index
	246	* @dev - device that requests this phy
	247	* @index - the index of the phy
	248	*
	249	* Gets the phy using usb_get_phy_dev(), and associates a device with it using
	250	* devres. On driver detach, release function is invoked on the devres data,
	251	* then, devres data is freed.
	252	*
	253	* For use by USB host and peripheral drivers.
	254	*/
	255	struct usb_phy devm_usb_get_phy_dev(struct device dev, u8 index)
	256	{
	257	struct usb_phy *ptr, phy;
	258
	259	ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
	260	if (!ptr)
	261	return NULL;
	262
	263	phy = usb_get_phy_dev(dev, index);
	264	if (!IS_ERR(phy)) {
	265	*ptr = phy;
	266	devres_add(dev, ptr);
	267	} else
	268	devres_free(ptr);
	269
	270	return phy;
	271	}
110ff6d0	272	EXPORT_SYMBOL_GPL(devm_usb_get_phy_dev);
cedf8602 SH	273
	274	/**
	275	* devm_usb_put_phy - release the USB PHY
	276	* @dev - device that wants to release this phy
	277	* @phy - the phy returned by devm_usb_get_phy()
	278	*
	279	* destroys the devres associated with this phy and invokes usb_put_phy
	280	* to release the phy.
	281	*
	282	* For use by USB host and peripheral drivers.
	283	*/
	284	void devm_usb_put_phy(struct device dev, struct usb_phy phy)
	285	{
	286	int r;
	287
	288	r = devres_destroy(dev, devm_usb_phy_release, devm_usb_phy_match, phy);
	289	dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
	290	}
110ff6d0	291	EXPORT_SYMBOL_GPL(devm_usb_put_phy);
cedf8602 SH	292
	293	/**
	294	* usb_put_phy - release the USB PHY
	295	* @x: the phy returned by usb_get_phy()
	296	*
	297	* Releases a refcount the caller received from usb_get_phy().
	298	*
	299	* For use by USB host and peripheral drivers.
	300	*/
	301	void usb_put_phy(struct usb_phy *x)
	302	{
	303	if (x) {
	304	struct module *owner = x->dev->driver->owner;
	305
	306	put_device(x->dev);
	307	module_put(owner);
	308	}
	309	}
110ff6d0	310	EXPORT_SYMBOL_GPL(usb_put_phy);
cedf8602 SH	311
	312	/**
	313	* usb_add_phy - declare the USB PHY
	314	* @x: the USB phy to be used; or NULL
	315	* @type - the type of this PHY
	316	*
	317	* This call is exclusively for use by phy drivers, which
	318	* coordinate the activities of drivers for host and peripheral
	319	* controllers, and in some cases for VBUS current regulation.
	320	*/
	321	int usb_add_phy(struct usb_phy *x, enum usb_phy_type type)
	322	{
	323	int ret = 0;
	324	unsigned long flags;
	325	struct usb_phy *phy;
	326
	327	if (x->type != USB_PHY_TYPE_UNDEFINED) {
	328	dev_err(x->dev, "not accepting initialized PHY %s\n", x->label);
	329	return -EINVAL;
	330	}
	331
31e32227 NZ	332	ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
31e32227 NZ	333
cedf8602 SH	334	spin_lock_irqsave(&phy_lock, flags);
	335
	336	list_for_each_entry(phy, &phy_list, head) {
	337	if (phy->type == type) {
	338	ret = -EBUSY;
	339	dev_err(x->dev, "transceiver type %s already exists\n",
	340	usb_phy_type_string(type));
	341	goto out;
	342	}
	343	}
	344
	345	x->type = type;
	346	list_add_tail(&x->head, &phy_list);
	347
	348	out:
	349	spin_unlock_irqrestore(&phy_lock, flags);
	350	return ret;
	351	}
110ff6d0	352	EXPORT_SYMBOL_GPL(usb_add_phy);
cedf8602 SH	353
	354	/**
	355	* usb_add_phy_dev - declare the USB PHY
	356	* @x: the USB phy to be used; or NULL
	357	*
	358	* This call is exclusively for use by phy drivers, which
	359	* coordinate the activities of drivers for host and peripheral
	360	* controllers, and in some cases for VBUS current regulation.
	361	*/
	362	int usb_add_phy_dev(struct usb_phy *x)
	363	{
	364	struct usb_phy_bind *phy_bind;
	365	unsigned long flags;
	366
	367	if (!x->dev) {
	368	dev_err(x->dev, "no device provided for PHY\n");
	369	return -EINVAL;
	370	}
	371
31e32227 NZ	372	ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
31e32227 NZ	373
cedf8602 SH	374	spin_lock_irqsave(&phy_lock, flags);
	375	list_for_each_entry(phy_bind, &phy_bind_list, list)
	376	if (!(strcmp(phy_bind->phy_dev_name, dev_name(x->dev))))
	377	phy_bind->phy = x;
	378
	379	list_add_tail(&x->head, &phy_list);
	380
	381	spin_unlock_irqrestore(&phy_lock, flags);
	382	return 0;
	383	}
110ff6d0	384	EXPORT_SYMBOL_GPL(usb_add_phy_dev);
cedf8602 SH	385
	386	/**
	387	* usb_remove_phy - remove the OTG PHY
	388	* @x: the USB OTG PHY to be removed;
	389	*
	390	* This reverts the effects of usb_add_phy
	391	*/
	392	void usb_remove_phy(struct usb_phy *x)
	393	{
	394	unsigned long flags;
	395	struct usb_phy_bind *phy_bind;
	396
	397	spin_lock_irqsave(&phy_lock, flags);
	398	if (x) {
	399	list_for_each_entry(phy_bind, &phy_bind_list, list)
	400	if (phy_bind->phy == x)
	401	phy_bind->phy = NULL;
	402	list_del(&x->head);
	403	}
	404	spin_unlock_irqrestore(&phy_lock, flags);
	405	}
110ff6d0	406	EXPORT_SYMBOL_GPL(usb_remove_phy);
cedf8602 SH	407
	408	/**
	409	* usb_bind_phy - bind the phy and the controller that uses the phy
	410	* @dev_name: the device name of the device that will bind to the phy
	411	* @index: index to specify the port number
	412	* @phy_dev_name: the device name of the phy
	413	*
	414	* Fills the phy_bind structure with the dev_name and phy_dev_name. This will
	415	* be used when the phy driver registers the phy and when the controller
	416	* requests this phy.
	417	*
	418	* To be used by platform specific initialization code.
	419	*/
19d8cedd	420	int usb_bind_phy(const char *dev_name, u8 index,
cedf8602 SH	421	const char *phy_dev_name)
	422	{
	423	struct usb_phy_bind *phy_bind;
	424	unsigned long flags;
	425
	426	phy_bind = kzalloc(sizeof(*phy_bind), GFP_KERNEL);
e9d123a5	427	if (!phy_bind)
cedf8602	428	return -ENOMEM;
cedf8602 SH	429
	430	phy_bind->dev_name = dev_name;
	431	phy_bind->phy_dev_name = phy_dev_name;
	432	phy_bind->index = index;
	433
	434	spin_lock_irqsave(&phy_lock, flags);
	435	list_add_tail(&phy_bind->list, &phy_bind_list);
	436	spin_unlock_irqrestore(&phy_lock, flags);
	437
	438	return 0;
	439	}
	440	EXPORT_SYMBOL_GPL(usb_bind_phy);