[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;

	if (!of_device_is_available(node))
		return ERR_PTR(-ENODEV);

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

		return phy;
	}

	return ERR_PTR(-EPROBE_DEFER);
}

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)
{
	struct usb_phy **phy = res;

	return *phy == 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)) {
		devres_free(ptr);
		goto err1;
	}

	if (!try_module_get(phy->dev->driver->owner)) {
		phy = ERR_PTR(-ENODEV);
		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);

/**
 * usb_phy_set_event - set event to phy event
 * @x: the phy returned by usb_get_phy();
 *
 * This sets event to phy event
 */
void usb_phy_set_event(struct usb_phy *x, unsigned long event)
{
	x->last_event = event;
}
EXPORT_SYMBOL_GPL(usb_phy_set_event);
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
0df8fc37	37	return ERR_PTR(-ENODEV);
cedf8602 SH	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
c818a94c TR	62	if (!of_device_is_available(node))
	63	return ERR_PTR(-ENODEV);
	64
cedf8602 SH	65	list_for_each_entry(phy, &phy_list, head) {
	66	if (node != phy->dev->of_node)
	67	continue;
	68
	69	return phy;
	70	}
	71
9c9d8249	72	return ERR_PTR(-EPROBE_DEFER);
cedf8602 SH	73	}
	74
	75	static void devm_usb_phy_release(struct device dev, void res)
	76	{
	77	struct usb_phy phy = (struct usb_phy **)res;
	78
	79	usb_put_phy(phy);
	80	}
	81
	82	static int devm_usb_phy_match(struct device dev, void res, void *match_data)
	83	{
869aee0f AL	84	struct usb_phy **phy = res;
	85
	86	return *phy == match_data;
cedf8602 SH	87	}
	88
	89	/**
	90	* devm_usb_get_phy - find the USB PHY
	91	* @dev - device that requests this phy
	92	* @type - the type of the phy the controller requires
	93	*
	94	* Gets the phy using usb_get_phy(), and associates a device with it using
	95	* devres. On driver detach, release function is invoked on the devres data,
	96	* then, devres data is freed.
	97	*
	98	* For use by USB host and peripheral drivers.
	99	*/
	100	struct usb_phy devm_usb_get_phy(struct device dev, enum usb_phy_type type)
	101	{
	102	struct usb_phy *ptr, phy;
	103
	104	ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
	105	if (!ptr)
7f4d1e7b	106	return ERR_PTR(-ENOMEM);
cedf8602 SH	107
	108	phy = usb_get_phy(type);
	109	if (!IS_ERR(phy)) {
	110	*ptr = phy;
	111	devres_add(dev, ptr);
	112	} else
	113	devres_free(ptr);
	114
	115	return phy;
	116	}
110ff6d0	117	EXPORT_SYMBOL_GPL(devm_usb_get_phy);
cedf8602 SH	118
	119	/**
	120	* usb_get_phy - find the USB PHY
	121	* @type - the type of the phy the controller requires
	122	*
	123	* Returns the phy driver, after getting a refcount to it; or
	124	* -ENODEV if there is no such phy. The caller is responsible for
	125	* calling usb_put_phy() to release that count.
	126	*
	127	* For use by USB host and peripheral drivers.
	128	*/
	129	struct usb_phy *usb_get_phy(enum usb_phy_type type)
	130	{
	131	struct usb_phy *phy = NULL;
	132	unsigned long flags;
	133
	134	spin_lock_irqsave(&phy_lock, flags);
	135
	136	phy = __usb_find_phy(&phy_list, type);
	137	if (IS_ERR(phy) \|\| !try_module_get(phy->dev->driver->owner)) {
e9d123a5	138	pr_debug("PHY: unable to find transceiver of type %s\n",
cedf8602	139	usb_phy_type_string(type));
9dc9cb0c MK	140	if (!IS_ERR(phy))
	141	phy = ERR_PTR(-ENODEV);
	142
cedf8602 SH	143	goto err0;
	144	}
	145
	146	get_device(phy->dev);
	147
	148	err0:
	149	spin_unlock_irqrestore(&phy_lock, flags);
	150
	151	return phy;
	152	}
110ff6d0	153	EXPORT_SYMBOL_GPL(usb_get_phy);
cedf8602	154
fb1928de	155	/**
cedf8602 SH	156	* devm_usb_get_phy_by_phandle - find the USB PHY by phandle
	157	* @dev - device that requests this phy
	158	* @phandle - name of the property holding the phy phandle value
	159	* @index - the index of the phy
	160	*
	161	* Returns the phy driver associated with the given phandle value,
	162	* after getting a refcount to it, -ENODEV if there is no such phy or
	163	* -EPROBE_DEFER if there is a phandle to the phy, but the device is
	164	* not yet loaded. While at that, it also associates the device with
	165	* the phy using devres. On driver detach, release function is invoked
	166	* on the devres data, then, devres data is freed.
	167	*
	168	* For use by USB host and peripheral drivers.
	169	*/
	170	struct usb_phy devm_usb_get_phy_by_phandle(struct device dev,
	171	const char *phandle, u8 index)
	172	{
	173	struct usb_phy phy = ERR_PTR(-ENOMEM), *ptr;
	174	unsigned long flags;
	175	struct device_node *node;
	176
	177	if (!dev->of_node) {
	178	dev_dbg(dev, "device does not have a device node entry\n");
	179	return ERR_PTR(-EINVAL);
	180	}
	181
	182	node = of_parse_phandle(dev->of_node, phandle, index);
	183	if (!node) {
	184	dev_dbg(dev, "failed to get %s phandle in %s node\n", phandle,
	185	dev->of_node->full_name);
	186	return ERR_PTR(-ENODEV);
	187	}
	188
	189	ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
	190	if (!ptr) {
	191	dev_dbg(dev, "failed to allocate memory for devres\n");
	192	goto err0;
	193	}
	194
	195	spin_lock_irqsave(&phy_lock, flags);
	196
	197	phy = __of_usb_find_phy(node);
c818a94c TR	198	if (IS_ERR(phy)) {
	199	devres_free(ptr);
	200	goto err1;
	201	}
1290a958	202
c818a94c TR	203	if (!try_module_get(phy->dev->driver->owner)) {
c818a94c TR	204	phy = ERR_PTR(-ENODEV);
cedf8602 SH	205	devres_free(ptr);
	206	goto err1;
	207	}
	208
	209	*ptr = phy;
	210	devres_add(dev, ptr);
	211
	212	get_device(phy->dev);
	213
	214	err1:
	215	spin_unlock_irqrestore(&phy_lock, flags);
	216
	217	err0:
	218	of_node_put(node);
	219
	220	return phy;
	221	}
110ff6d0	222	EXPORT_SYMBOL_GPL(devm_usb_get_phy_by_phandle);
cedf8602 SH	223
	224	/**
	225	* usb_get_phy_dev - find the USB PHY
	226	* @dev - device that requests this phy
	227	* @index - the index of the phy
	228	*
	229	* Returns the phy driver, after getting a refcount to it; or
	230	* -ENODEV if there is no such phy. The caller is responsible for
	231	* calling usb_put_phy() to release that count.
	232	*
	233	* For use by USB host and peripheral drivers.
	234	*/
	235	struct usb_phy usb_get_phy_dev(struct device dev, u8 index)
	236	{
	237	struct usb_phy *phy = NULL;
	238	unsigned long flags;
	239
	240	spin_lock_irqsave(&phy_lock, flags);
	241
	242	phy = __usb_find_phy_dev(dev, &phy_bind_list, index);
	243	if (IS_ERR(phy) \|\| !try_module_get(phy->dev->driver->owner)) {
e9d123a5	244	dev_dbg(dev, "unable to find transceiver\n");
2c4e3dbf AS	245	if (!IS_ERR(phy))
	246	phy = ERR_PTR(-ENODEV);
	247
cedf8602 SH	248	goto err0;
	249	}
	250
	251	get_device(phy->dev);
	252
	253	err0:
	254	spin_unlock_irqrestore(&phy_lock, flags);
	255
	256	return phy;
	257	}
110ff6d0	258	EXPORT_SYMBOL_GPL(usb_get_phy_dev);
cedf8602 SH	259
	260	/**
	261	* devm_usb_get_phy_dev - find the USB PHY using device ptr and index
	262	* @dev - device that requests this phy
	263	* @index - the index of the phy
	264	*
	265	* Gets the phy using usb_get_phy_dev(), and associates a device with it using
	266	* devres. On driver detach, release function is invoked on the devres data,
	267	* then, devres data is freed.
	268	*
	269	* For use by USB host and peripheral drivers.
	270	*/
	271	struct usb_phy devm_usb_get_phy_dev(struct device dev, u8 index)
	272	{
	273	struct usb_phy *ptr, phy;
	274
	275	ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
	276	if (!ptr)
	277	return NULL;
	278
	279	phy = usb_get_phy_dev(dev, index);
	280	if (!IS_ERR(phy)) {
	281	*ptr = phy;
	282	devres_add(dev, ptr);
	283	} else
	284	devres_free(ptr);
	285
	286	return phy;
	287	}
110ff6d0	288	EXPORT_SYMBOL_GPL(devm_usb_get_phy_dev);
cedf8602 SH	289
	290	/**
	291	* devm_usb_put_phy - release the USB PHY
	292	* @dev - device that wants to release this phy
	293	* @phy - the phy returned by devm_usb_get_phy()
	294	*
	295	* destroys the devres associated with this phy and invokes usb_put_phy
	296	* to release the phy.
	297	*
	298	* For use by USB host and peripheral drivers.
	299	*/
	300	void devm_usb_put_phy(struct device dev, struct usb_phy phy)
	301	{
	302	int r;
	303
	304	r = devres_destroy(dev, devm_usb_phy_release, devm_usb_phy_match, phy);
	305	dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n");
	306	}
110ff6d0	307	EXPORT_SYMBOL_GPL(devm_usb_put_phy);
cedf8602 SH	308
	309	/**
	310	* usb_put_phy - release the USB PHY
	311	* @x: the phy returned by usb_get_phy()
	312	*
	313	* Releases a refcount the caller received from usb_get_phy().
	314	*
	315	* For use by USB host and peripheral drivers.
	316	*/
	317	void usb_put_phy(struct usb_phy *x)
	318	{
	319	if (x) {
	320	struct module *owner = x->dev->driver->owner;
	321
	322	put_device(x->dev);
	323	module_put(owner);
	324	}
	325	}
110ff6d0	326	EXPORT_SYMBOL_GPL(usb_put_phy);
cedf8602 SH	327
	328	/**
	329	* usb_add_phy - declare the USB PHY
	330	* @x: the USB phy to be used; or NULL
	331	* @type - the type of this PHY
	332	*
	333	* This call is exclusively for use by phy drivers, which
	334	* coordinate the activities of drivers for host and peripheral
	335	* controllers, and in some cases for VBUS current regulation.
	336	*/
	337	int usb_add_phy(struct usb_phy *x, enum usb_phy_type type)
	338	{
	339	int ret = 0;
	340	unsigned long flags;
	341	struct usb_phy *phy;
	342
	343	if (x->type != USB_PHY_TYPE_UNDEFINED) {
	344	dev_err(x->dev, "not accepting initialized PHY %s\n", x->label);
	345	return -EINVAL;
	346	}
	347
31e32227 NZ	348	ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
31e32227 NZ	349
cedf8602 SH	350	spin_lock_irqsave(&phy_lock, flags);
	351
	352	list_for_each_entry(phy, &phy_list, head) {
	353	if (phy->type == type) {
	354	ret = -EBUSY;
	355	dev_err(x->dev, "transceiver type %s already exists\n",
	356	usb_phy_type_string(type));
	357	goto out;
	358	}
	359	}
	360
	361	x->type = type;
	362	list_add_tail(&x->head, &phy_list);
	363
	364	out:
	365	spin_unlock_irqrestore(&phy_lock, flags);
	366	return ret;
	367	}
110ff6d0	368	EXPORT_SYMBOL_GPL(usb_add_phy);
cedf8602 SH	369
	370	/**
	371	* usb_add_phy_dev - declare the USB PHY
	372	* @x: the USB phy to be used; or NULL
	373	*
	374	* This call is exclusively for use by phy drivers, which
	375	* coordinate the activities of drivers for host and peripheral
	376	* controllers, and in some cases for VBUS current regulation.
	377	*/
	378	int usb_add_phy_dev(struct usb_phy *x)
	379	{
	380	struct usb_phy_bind *phy_bind;
	381	unsigned long flags;
	382
	383	if (!x->dev) {
	384	dev_err(x->dev, "no device provided for PHY\n");
	385	return -EINVAL;
	386	}
	387
31e32227 NZ	388	ATOMIC_INIT_NOTIFIER_HEAD(&x->notifier);
31e32227 NZ	389
cedf8602 SH	390	spin_lock_irqsave(&phy_lock, flags);
	391	list_for_each_entry(phy_bind, &phy_bind_list, list)
	392	if (!(strcmp(phy_bind->phy_dev_name, dev_name(x->dev))))
	393	phy_bind->phy = x;
	394
	395	list_add_tail(&x->head, &phy_list);
	396
	397	spin_unlock_irqrestore(&phy_lock, flags);
	398	return 0;
	399	}
110ff6d0	400	EXPORT_SYMBOL_GPL(usb_add_phy_dev);
cedf8602 SH	401
	402	/**
	403	* usb_remove_phy - remove the OTG PHY
	404	* @x: the USB OTG PHY to be removed;
	405	*
	406	* This reverts the effects of usb_add_phy
	407	*/
	408	void usb_remove_phy(struct usb_phy *x)
	409	{
	410	unsigned long flags;
	411	struct usb_phy_bind *phy_bind;
	412
	413	spin_lock_irqsave(&phy_lock, flags);
	414	if (x) {
	415	list_for_each_entry(phy_bind, &phy_bind_list, list)
	416	if (phy_bind->phy == x)
	417	phy_bind->phy = NULL;
	418	list_del(&x->head);
	419	}
	420	spin_unlock_irqrestore(&phy_lock, flags);
	421	}
110ff6d0	422	EXPORT_SYMBOL_GPL(usb_remove_phy);
cedf8602 SH	423
	424	/**
	425	* usb_bind_phy - bind the phy and the controller that uses the phy
	426	* @dev_name: the device name of the device that will bind to the phy
	427	* @index: index to specify the port number
	428	* @phy_dev_name: the device name of the phy
	429	*
	430	* Fills the phy_bind structure with the dev_name and phy_dev_name. This will
	431	* be used when the phy driver registers the phy and when the controller
	432	* requests this phy.
	433	*
	434	* To be used by platform specific initialization code.
	435	*/
19d8cedd	436	int usb_bind_phy(const char *dev_name, u8 index,
cedf8602 SH	437	const char *phy_dev_name)
	438	{
	439	struct usb_phy_bind *phy_bind;
	440	unsigned long flags;
	441
	442	phy_bind = kzalloc(sizeof(*phy_bind), GFP_KERNEL);
e9d123a5	443	if (!phy_bind)
cedf8602	444	return -ENOMEM;
cedf8602 SH	445
	446	phy_bind->dev_name = dev_name;
	447	phy_bind->phy_dev_name = phy_dev_name;
	448	phy_bind->index = index;
	449
	450	spin_lock_irqsave(&phy_lock, flags);
	451	list_add_tail(&phy_bind->list, &phy_bind_list);
	452	spin_unlock_irqrestore(&phy_lock, flags);
	453
	454	return 0;
	455	}
	456	EXPORT_SYMBOL_GPL(usb_bind_phy);
df9f7b31 KR	457
	458	/**
	459	* usb_phy_set_event - set event to phy event
	460	* @x: the phy returned by usb_get_phy();
	461	*
	462	* This sets event to phy event
	463	*/
	464	void usb_phy_set_event(struct usb_phy *x, unsigned long event)
	465	{
	466	x->last_event = event;
	467	}
	468	EXPORT_SYMBOL_GPL(usb_phy_set_event);