[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / gadget / udc-core.c

/**
 * udc.c - Core UDC Framework
 *
 * Copyright (C) 2010 Texas Instruments
 * Author: Felipe Balbi <balbi@ti.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2  of
 * the License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/err.h>

#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>

/**
 * struct usb_udc - describes one usb device controller
 * @driver - the gadget driver pointer. For use by the class code
 * @dev - the child device to the actual controller
 * @gadget - the gadget. For use by the class code
 * @list - for use by the udc class driver
 *
 * This represents the internal data structure which is used by the UDC-class
 * to hold information about udc driver and gadget together.
 */
struct usb_udc {
	struct usb_gadget_driver	*driver;
	struct usb_gadget		*gadget;
	struct device			dev;
	struct list_head		list;
};

static struct class *udc_class;
static struct device_type udc_device_type;
static LIST_HEAD(udc_list);
static DEFINE_MUTEX(udc_lock);

/* ------------------------------------------------------------------------- */

/**
 * usb_gadget_start - tells usb device controller to start up
 * @gadget: The gadget we want to get started
 * @driver: The driver we want to bind to @gadget
 * @bind: The bind function for @driver
 *
 * This call is issued by the UDC Class driver when it's about
 * to register a gadget driver to the device controller, before
 * calling gadget driver's bind() method.
 *
 * It allows the controller to be powered off until strictly
 * necessary to have it powered on.
 *
 * Returns zero on success, else negative errno.
 */
static inline int usb_gadget_start(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver,
		int (*bind)(struct usb_gadget *))
{
	return gadget->ops->start(driver, bind);
}

/**
 * usb_gadget_udc_start - tells usb device controller to start up
 * @gadget: The gadget we want to get started
 * @driver: The driver we want to bind to @gadget
 *
 * This call is issued by the UDC Class driver when it's about
 * to register a gadget driver to the device controller, before
 * calling gadget driver's bind() method.
 *
 * It allows the controller to be powered off until strictly
 * necessary to have it powered on.
 *
 * Returns zero on success, else negative errno.
 */
static inline int usb_gadget_udc_start(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver)
{
	return gadget->ops->udc_start(gadget, driver);
}

/**
 * usb_gadget_stop - tells usb device controller we don't need it anymore
 * @gadget: The device we want to stop activity
 * @driver: The driver to unbind from @gadget
 *
 * This call is issued by the UDC Class driver after calling
 * gadget driver's unbind() method.
 *
 * The details are implementation specific, but it can go as
 * far as powering off UDC completely and disable its data
 * line pullups.
 */
static inline void usb_gadget_stop(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver)
{
	gadget->ops->stop(driver);
}

/**
 * usb_gadget_udc_stop - tells usb device controller we don't need it anymore
 * @gadget: The device we want to stop activity
 * @driver: The driver to unbind from @gadget
 *
 * This call is issued by the UDC Class driver after calling
 * gadget driver's unbind() method.
 *
 * The details are implementation specific, but it can go as
 * far as powering off UDC completely and disable its data
 * line pullups.
 */
static inline void usb_gadget_udc_stop(struct usb_gadget *gadget,
		struct usb_gadget_driver *driver)
{
	gadget->ops->udc_stop(gadget, driver);
}

/**
 * usb_udc_release - release the usb_udc struct
 * @dev: the dev member within usb_udc
 *
 * This is called by driver's core in order to free memory once the last
 * reference is released.
 */
static void usb_udc_release(struct device *dev)
{
	struct usb_udc *udc;

	udc = container_of(dev, struct usb_udc, dev);
	dev_dbg(dev, "releasing '%s'\n", dev_name(dev));
	kfree(udc);
}

/**
 * usb_add_gadget_udc - adds a new gadget to the udc class driver list
 * @parent: the parent device to this udc. Usually the controller
 * driver's device.
 * @gadget: the gadget to be added to the list
 *
 * Returns zero on success, negative errno otherwise.
 */
int usb_add_gadget_udc(struct device *parent, struct usb_gadget *gadget)
{
	struct usb_udc		*udc;
	int			ret = -ENOMEM;

	udc = kzalloc(sizeof(*udc), GFP_KERNEL);
	if (!udc)
		goto err1;

	device_initialize(&udc->dev);
	udc->dev.release = usb_udc_release;
	udc->dev.class = udc_class;
	udc->dev.parent = parent;
	ret = dev_set_name(&udc->dev, "%s", kobject_name(&parent->kobj));
	if (ret)
		goto err2;

	udc->gadget = gadget;

	mutex_lock(&udc_lock);
	list_add_tail(&udc->list, &udc_list);

	ret = device_add(&udc->dev);
	if (ret)
		goto err3;

	mutex_unlock(&udc_lock);

	return 0;
err3:
	list_del(&udc->list);
	mutex_unlock(&udc_lock);

err2:
	put_device(&udc->dev);

err1:
	return ret;
}
EXPORT_SYMBOL_GPL(usb_add_gadget_udc);

static int udc_is_newstyle(struct usb_udc *udc)
{
	if (udc->gadget->ops->udc_start && udc->gadget->ops->udc_stop)
		return 1;
	return 0;
}


static void usb_gadget_remove_driver(struct usb_udc *udc)
{
	dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n",
			udc->gadget->name);

	kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);

	if (udc_is_newstyle(udc)) {
		usb_gadget_disconnect(udc->gadget);
		udc->driver->unbind(udc->gadget);
		usb_gadget_udc_stop(udc->gadget, udc->driver);

	} else {
		usb_gadget_stop(udc->gadget, udc->driver);
	}

	udc->driver = NULL;
	udc->dev.driver = NULL;
}

/**
 * usb_del_gadget_udc - deletes @udc from udc_list
 * @gadget: the gadget to be removed.
 *
 * This, will call usb_gadget_unregister_driver() if
 * the @udc is still busy.
 */
void usb_del_gadget_udc(struct usb_gadget *gadget)
{
	struct usb_udc		*udc = NULL;

	mutex_lock(&udc_lock);
	list_for_each_entry(udc, &udc_list, list)
		if (udc->gadget == gadget)
			goto found;

	dev_err(gadget->dev.parent, "gadget not registered.\n");
	mutex_unlock(&udc_lock);

	return;

found:
	dev_vdbg(gadget->dev.parent, "unregistering gadget\n");

	list_del(&udc->list);
	mutex_unlock(&udc_lock);

	if (udc->driver)
		usb_gadget_remove_driver(udc);

	kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE);
	device_unregister(&udc->dev);
}
EXPORT_SYMBOL_GPL(usb_del_gadget_udc);

/* ------------------------------------------------------------------------- */

int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
		int (*bind)(struct usb_gadget *))
{
	struct usb_udc		*udc = NULL;
	int			ret;

	if (!driver || !bind || !driver->setup)
		return -EINVAL;

	mutex_lock(&udc_lock);
	list_for_each_entry(udc, &udc_list, list) {
		/* For now we take the first one */
		if (!udc->driver)
			goto found;
	}

	pr_debug("couldn't find an available UDC\n");
	mutex_unlock(&udc_lock);
	return -ENODEV;

found:
	dev_dbg(&udc->dev, "registering UDC driver [%s]\n",
			driver->function);

	udc->driver = driver;
	udc->dev.driver = &driver->driver;

	if (udc_is_newstyle(udc)) {
		ret = bind(udc->gadget);
		if (ret)
			goto err1;
		ret = usb_gadget_udc_start(udc->gadget, driver);
		if (ret) {
			driver->unbind(udc->gadget);
			goto err1;
		}
		usb_gadget_connect(udc->gadget);
	} else {

		ret = usb_gadget_start(udc->gadget, driver, bind);
		if (ret)
			goto err1;

	}

	kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
	mutex_unlock(&udc_lock);
	return 0;

err1:
	dev_err(&udc->dev, "failed to start %s: %d\n",
			udc->driver->function, ret);
	udc->driver = NULL;
	udc->dev.driver = NULL;
	mutex_unlock(&udc_lock);
	return ret;
}
EXPORT_SYMBOL_GPL(usb_gadget_probe_driver);

int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
{
	struct usb_udc		*udc = NULL;
	int			ret = -ENODEV;

	if (!driver || !driver->unbind)
		return -EINVAL;

	mutex_lock(&udc_lock);
	list_for_each_entry(udc, &udc_list, list)
		if (udc->driver == driver) {
			usb_gadget_remove_driver(udc);
			ret = 0;
			break;
		}

	mutex_unlock(&udc_lock);
	return ret;
}
EXPORT_SYMBOL_GPL(usb_gadget_unregister_driver);

/* ------------------------------------------------------------------------- */

static ssize_t usb_udc_srp_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t n)
{
	struct usb_udc		*udc = dev_get_drvdata(dev);

	if (sysfs_streq(buf, "1"))
		usb_gadget_wakeup(udc->gadget);

	return n;
}
static DEVICE_ATTR(srp, S_IWUSR, NULL, usb_udc_srp_store);

static ssize_t usb_udc_softconn_store(struct device *dev,
		struct device_attribute *attr, const char *buf, size_t n)
{
	struct usb_udc		*udc = dev_get_drvdata(dev);

	if (sysfs_streq(buf, "connect")) {
		usb_gadget_connect(udc->gadget);
	} else if (sysfs_streq(buf, "disconnect")) {
		usb_gadget_disconnect(udc->gadget);
	} else {
		dev_err(dev, "unsupported command '%s'\n", buf);
		return -EINVAL;
	}

	return n;
}
static DEVICE_ATTR(soft_connect, S_IWUSR, NULL, usb_udc_softconn_store);

static ssize_t usb_udc_speed_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct usb_udc		*udc = dev_get_drvdata(dev);
	struct usb_gadget	*gadget = udc->gadget;

	switch (gadget->speed) {
	case USB_SPEED_LOW:
		return snprintf(buf, PAGE_SIZE, "low-speed\n");
	case USB_SPEED_FULL:
		return snprintf(buf, PAGE_SIZE, "full-speed\n");
	case USB_SPEED_HIGH:
		return snprintf(buf, PAGE_SIZE, "high-speed\n");
	case USB_SPEED_WIRELESS:
		return snprintf(buf, PAGE_SIZE, "wireless\n");
	case USB_SPEED_SUPER:
		return snprintf(buf, PAGE_SIZE, "super-speed\n");
	case USB_SPEED_UNKNOWN:	/* FALLTHROUGH */
	default:
		return snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
	}
}
static DEVICE_ATTR(speed, S_IRUSR, usb_udc_speed_show, NULL);

#define USB_UDC_ATTR(name)					\
ssize_t usb_udc_##name##_show(struct device *dev,		\
		struct device_attribute *attr, char *buf)	\
{								\
	struct usb_udc		*udc = dev_get_drvdata(dev);	\
	struct usb_gadget	*gadget = udc->gadget;		\
								\
	return snprintf(buf, PAGE_SIZE, "%d\n", gadget->name);	\
}								\
static DEVICE_ATTR(name, S_IRUSR, usb_udc_##name##_show, NULL)

static USB_UDC_ATTR(is_dualspeed);
static USB_UDC_ATTR(is_otg);
static USB_UDC_ATTR(is_a_peripheral);
static USB_UDC_ATTR(b_hnp_enable);
static USB_UDC_ATTR(a_hnp_support);
static USB_UDC_ATTR(a_alt_hnp_support);

static struct attribute *usb_udc_attrs[] = {
	&dev_attr_srp.attr,
	&dev_attr_soft_connect.attr,
	&dev_attr_speed.attr,

	&dev_attr_is_dualspeed.attr,
	&dev_attr_is_otg.attr,
	&dev_attr_is_a_peripheral.attr,
	&dev_attr_b_hnp_enable.attr,
	&dev_attr_a_hnp_support.attr,
	&dev_attr_a_alt_hnp_support.attr,
	NULL,
};

static const struct attribute_group usb_udc_attr_group = {
	.attrs = usb_udc_attrs,
};

static const struct attribute_group *usb_udc_attr_groups[] = {
	&usb_udc_attr_group,
	NULL,
};

static int usb_udc_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct usb_udc		*udc = container_of(dev, struct usb_udc, dev);
	int			ret;

	ret = add_uevent_var(env, "USB_UDC_NAME=%s", udc->gadget->name);
	if (ret) {
		dev_err(dev, "failed to add uevent USB_UDC_NAME\n");
		return ret;
	}

	if (udc->driver) {
		ret = add_uevent_var(env, "USB_UDC_DRIVER=%s",
				udc->driver->function);
		if (ret) {
			dev_err(dev, "failed to add uevent USB_UDC_DRIVER\n");
			return ret;
		}
	}

	return 0;
}

static int __init usb_udc_init(void)
{
	udc_class = class_create(THIS_MODULE, "udc");
	if (IS_ERR(udc_class)) {
		pr_err("failed to create udc class --> %ld\n",
				PTR_ERR(udc_class));
		return PTR_ERR(udc_class);
	}

	udc_class->dev_uevent = usb_udc_uevent;
	udc_device_type.groups = usb_udc_attr_groups;

	return 0;
}
subsys_initcall(usb_udc_init);

static void __exit usb_udc_exit(void)
{
	class_destroy(udc_class);
}
module_exit(usb_udc_exit);

MODULE_DESCRIPTION("UDC Framework");
MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
2ccea03a FB	1	/**
	2	* udc.c - Core UDC Framework
	3	*
	4	* Copyright (C) 2010 Texas Instruments
	5	* Author: Felipe Balbi <balbi@ti.com>
	6	*
	7	* This program is free software: you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 of
	9	* the License as published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include <linux/kernel.h>
	21	#include <linux/module.h>
	22	#include <linux/device.h>
	23	#include <linux/list.h>
	24	#include <linux/err.h>
	25
	26	#include <linux/usb/ch9.h>
	27	#include <linux/usb/gadget.h>
	28
	29	/**
	30	* struct usb_udc - describes one usb device controller
	31	* @driver - the gadget driver pointer. For use by the class code
	32	* @dev - the child device to the actual controller
	33	* @gadget - the gadget. For use by the class code
	34	* @list - for use by the udc class driver
	35	*
	36	* This represents the internal data structure which is used by the UDC-class
	37	* to hold information about udc driver and gadget together.
	38	*/
	39	struct usb_udc {
	40	struct usb_gadget_driver *driver;
	41	struct usb_gadget *gadget;
	42	struct device dev;
	43	struct list_head list;
	44	};
	45
	46	static struct class *udc_class;
	47	static struct device_type udc_device_type;
	48	static LIST_HEAD(udc_list);
	49	static DEFINE_MUTEX(udc_lock);
	50
	51	/* ------------------------------------------------------------------------- */
	52
	53	/**
	54	* usb_gadget_start - tells usb device controller to start up
	55	* @gadget: The gadget we want to get started
	56	* @driver: The driver we want to bind to @gadget
	57	* @bind: The bind function for @driver
	58	*
	59	* This call is issued by the UDC Class driver when it's about
	60	* to register a gadget driver to the device controller, before
	61	* calling gadget driver's bind() method.
	62	*
	63	* It allows the controller to be powered off until strictly
	64	* necessary to have it powered on.
65	*
66	* Returns zero on success, else negative errno.
67	*/
68	static inline int usb_gadget_start(struct usb_gadget *gadget,
69	struct usb_gadget_driver *driver,
70	int (bind)(struct usb_gadget ))
71	{
72	return gadget->ops->start(driver, bind);
73	}
74
352c2dc8 SAS	75	/**
	76	* usb_gadget_udc_start - tells usb device controller to start up
	77	* @gadget: The gadget we want to get started
	78	* @driver: The driver we want to bind to @gadget
	79	*
	80	* This call is issued by the UDC Class driver when it's about
	81	* to register a gadget driver to the device controller, before
	82	* calling gadget driver's bind() method.
	83	*
	84	* It allows the controller to be powered off until strictly
	85	* necessary to have it powered on.
	86	*
	87	* Returns zero on success, else negative errno.
	88	*/
	89	static inline int usb_gadget_udc_start(struct usb_gadget *gadget,
	90	struct usb_gadget_driver *driver)
	91	{
	92	return gadget->ops->udc_start(gadget, driver);
	93	}
	94
2ccea03a FB	95	/**
	96	* usb_gadget_stop - tells usb device controller we don't need it anymore
	97	* @gadget: The device we want to stop activity
	98	* @driver: The driver to unbind from @gadget
	99	*
	100	* This call is issued by the UDC Class driver after calling
	101	* gadget driver's unbind() method.
	102	*
	103	* The details are implementation specific, but it can go as
	104	* far as powering off UDC completely and disable its data
	105	* line pullups.
	106	*/
	107	static inline void usb_gadget_stop(struct usb_gadget *gadget,
	108	struct usb_gadget_driver *driver)
	109	{
	110	gadget->ops->stop(driver);
	111	}
	112
352c2dc8 SAS	113	/**
	114	* usb_gadget_udc_stop - tells usb device controller we don't need it anymore
	115	* @gadget: The device we want to stop activity
	116	* @driver: The driver to unbind from @gadget
	117	*
	118	* This call is issued by the UDC Class driver after calling
	119	* gadget driver's unbind() method.
	120	*
	121	* The details are implementation specific, but it can go as
	122	* far as powering off UDC completely and disable its data
	123	* line pullups.
	124	*/
	125	static inline void usb_gadget_udc_stop(struct usb_gadget *gadget,
	126	struct usb_gadget_driver *driver)
	127	{
	128	gadget->ops->udc_stop(gadget, driver);
	129	}
	130
2ccea03a FB	131	/**
	132	* usb_udc_release - release the usb_udc struct
	133	* @dev: the dev member within usb_udc
	134	*
	135	* This is called by driver's core in order to free memory once the last
	136	* reference is released.
	137	*/
	138	static void usb_udc_release(struct device *dev)
	139	{
	140	struct usb_udc *udc;
	141
	142	udc = container_of(dev, struct usb_udc, dev);
	143	dev_dbg(dev, "releasing '%s'\n", dev_name(dev));
	144	kfree(udc);
	145	}
	146
	147	/**
	148	* usb_add_gadget_udc - adds a new gadget to the udc class driver list
	149	* @parent: the parent device to this udc. Usually the controller
	150	* driver's device.
	151	* @gadget: the gadget to be added to the list
	152	*
	153	* Returns zero on success, negative errno otherwise.
	154	*/
	155	int usb_add_gadget_udc(struct device parent, struct usb_gadget gadget)
	156	{
	157	struct usb_udc *udc;
	158	int ret = -ENOMEM;
	159
	160	udc = kzalloc(sizeof(*udc), GFP_KERNEL);
	161	if (!udc)
	162	goto err1;
	163
	164	device_initialize(&udc->dev);
	165	udc->dev.release = usb_udc_release;
	166	udc->dev.class = udc_class;
	167	udc->dev.parent = parent;
	168	ret = dev_set_name(&udc->dev, "%s", kobject_name(&parent->kobj));
	169	if (ret)
	170	goto err2;
	171
	172	udc->gadget = gadget;
	173
	174	mutex_lock(&udc_lock);
	175	list_add_tail(&udc->list, &udc_list);
	176
	177	ret = device_add(&udc->dev);
	178	if (ret)
	179	goto err3;
	180
	181	mutex_unlock(&udc_lock);
	182
	183	return 0;
	184	err3:
	185	list_del(&udc->list);
	186	mutex_unlock(&udc_lock);
	187
	188	err2:
	189	put_device(&udc->dev);
	190
	191	err1:
	192	return ret;
	193	}
	194	EXPORT_SYMBOL_GPL(usb_add_gadget_udc);
195
352c2dc8 SAS	196	static int udc_is_newstyle(struct usb_udc *udc)
	197	{
	198	if (udc->gadget->ops->udc_start && udc->gadget->ops->udc_stop)
	199	return 1;
	200	return 0;
	201	}
	202
	203
2ccea03a FB	204	static void usb_gadget_remove_driver(struct usb_udc *udc)
	205	{
	206	dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n",
	207	udc->gadget->name);
	208
	209	kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
	210
352c2dc8 SAS	211	if (udc_is_newstyle(udc)) {
	212	usb_gadget_disconnect(udc->gadget);
	213	udc->driver->unbind(udc->gadget);
	214	usb_gadget_udc_stop(udc->gadget, udc->driver);
	215
	216	} else {
	217	usb_gadget_stop(udc->gadget, udc->driver);
	218	}
2ccea03a FB	219
	220	udc->driver = NULL;
	221	udc->dev.driver = NULL;
	222	}
	223
	224	/**
	225	* usb_del_gadget_udc - deletes @udc from udc_list
	226	* @gadget: the gadget to be removed.
	227	*
	228	* This, will call usb_gadget_unregister_driver() if
	229	* the @udc is still busy.
	230	*/
	231	void usb_del_gadget_udc(struct usb_gadget *gadget)
	232	{
	233	struct usb_udc *udc = NULL;
	234
	235	mutex_lock(&udc_lock);
	236	list_for_each_entry(udc, &udc_list, list)
	237	if (udc->gadget == gadget)
	238	goto found;
	239
	240	dev_err(gadget->dev.parent, "gadget not registered.\n");
	241	mutex_unlock(&udc_lock);
	242
	243	return;
	244
	245	found:
	246	dev_vdbg(gadget->dev.parent, "unregistering gadget\n");
	247
	248	list_del(&udc->list);
	249	mutex_unlock(&udc_lock);
	250
	251	if (udc->driver)
	252	usb_gadget_remove_driver(udc);
	253
	254	kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE);
	255	device_unregister(&udc->dev);
	256	}
	257	EXPORT_SYMBOL_GPL(usb_del_gadget_udc);
	258
	259	/* ------------------------------------------------------------------------- */
	260
	261	int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
	262	int (bind)(struct usb_gadget ))
	263	{
	264	struct usb_udc *udc = NULL;
	265	int ret;
	266
	267	if (!driver \|\| !bind \|\| !driver->setup)
	268	return -EINVAL;
	269
	270	mutex_lock(&udc_lock);
	271	list_for_each_entry(udc, &udc_list, list) {
	272	/* For now we take the first one */
	273	if (!udc->driver)
	274	goto found;
	275	}
	276
	277	pr_debug("couldn't find an available UDC\n");
	278	mutex_unlock(&udc_lock);
	279	return -ENODEV;
	280
	281	found:
	282	dev_dbg(&udc->dev, "registering UDC driver [%s]\n",
283	driver->function);
284
285	udc->driver = driver;
286	udc->dev.driver = &driver->driver;
287
352c2dc8 SAS	288	if (udc_is_newstyle(udc)) {
	289	ret = bind(udc->gadget);
	290	if (ret)
	291	goto err1;
	292	ret = usb_gadget_udc_start(udc->gadget, driver);
	293	if (ret) {
	294	driver->unbind(udc->gadget);
	295	goto err1;
	296	}
	297	usb_gadget_connect(udc->gadget);
	298	} else {
	299
	300	ret = usb_gadget_start(udc->gadget, driver, bind);
	301	if (ret)
	302	goto err1;
	303
	304	}
2ccea03a FB	305
	306	kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
	307	mutex_unlock(&udc_lock);
	308	return 0;
	309
	310	err1:
	311	dev_err(&udc->dev, "failed to start %s: %d\n",
	312	udc->driver->function, ret);
	313	udc->driver = NULL;
	314	udc->dev.driver = NULL;
	315	mutex_unlock(&udc_lock);
	316	return ret;
	317	}
	318	EXPORT_SYMBOL_GPL(usb_gadget_probe_driver);
	319
	320	int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
	321	{
	322	struct usb_udc *udc = NULL;
	323	int ret = -ENODEV;
	324
	325	if (!driver \|\| !driver->unbind)
	326	return -EINVAL;
	327
	328	mutex_lock(&udc_lock);
	329	list_for_each_entry(udc, &udc_list, list)
	330	if (udc->driver == driver) {
	331	usb_gadget_remove_driver(udc);
	332	ret = 0;
	333	break;
	334	}
	335
	336	mutex_unlock(&udc_lock);
	337	return ret;
	338	}
	339	EXPORT_SYMBOL_GPL(usb_gadget_unregister_driver);
	340
	341	/* ------------------------------------------------------------------------- */
	342
	343	static ssize_t usb_udc_srp_store(struct device *dev,
	344	struct device_attribute attr, const char buf, size_t n)
	345	{
	346	struct usb_udc *udc = dev_get_drvdata(dev);
	347
	348	if (sysfs_streq(buf, "1"))
	349	usb_gadget_wakeup(udc->gadget);
	350
	351	return n;
	352	}
	353	static DEVICE_ATTR(srp, S_IWUSR, NULL, usb_udc_srp_store);
	354
	355	static ssize_t usb_udc_softconn_store(struct device *dev,
	356	struct device_attribute attr, const char buf, size_t n)
	357	{
	358	struct usb_udc *udc = dev_get_drvdata(dev);
	359
	360	if (sysfs_streq(buf, "connect")) {
	361	usb_gadget_connect(udc->gadget);
	362	} else if (sysfs_streq(buf, "disconnect")) {
	363	usb_gadget_disconnect(udc->gadget);
	364	} else {
	365	dev_err(dev, "unsupported command '%s'\n", buf);
	366	return -EINVAL;
	367	}
	368
369	return n;
370	}
371	static DEVICE_ATTR(soft_connect, S_IWUSR, NULL, usb_udc_softconn_store);
372
373	static ssize_t usb_udc_speed_show(struct device *dev,
374	struct device_attribute attr, char buf)
375	{
376	struct usb_udc *udc = dev_get_drvdata(dev);
377	struct usb_gadget *gadget = udc->gadget;
378
379	switch (gadget->speed) {
380	case USB_SPEED_LOW:
381	return snprintf(buf, PAGE_SIZE, "low-speed\n");
382	case USB_SPEED_FULL:
383	return snprintf(buf, PAGE_SIZE, "full-speed\n");
384	case USB_SPEED_HIGH:
385	return snprintf(buf, PAGE_SIZE, "high-speed\n");
386	case USB_SPEED_WIRELESS:
387	return snprintf(buf, PAGE_SIZE, "wireless\n");
388	case USB_SPEED_SUPER:
389	return snprintf(buf, PAGE_SIZE, "super-speed\n");
390	case USB_SPEED_UNKNOWN: /* FALLTHROUGH */
391	default:
392	return snprintf(buf, PAGE_SIZE, "UNKNOWN\n");
393	}
394	}
395	static DEVICE_ATTR(speed, S_IRUSR, usb_udc_speed_show, NULL);
396
397	#define USB_UDC_ATTR(name) \
398	ssize_t usb_udc_##name##_show(struct device *dev, \
399	struct device_attribute attr, char buf) \
400	{ \
401	struct usb_udc *udc = dev_get_drvdata(dev); \
402	struct usb_gadget *gadget = udc->gadget; \
403	\
404	return snprintf(buf, PAGE_SIZE, "%d\n", gadget->name); \
405	} \
406	static DEVICE_ATTR(name, S_IRUSR, usb_udc_##name##_show, NULL)
407
408	static USB_UDC_ATTR(is_dualspeed);
409	static USB_UDC_ATTR(is_otg);
410	static USB_UDC_ATTR(is_a_peripheral);
411	static USB_UDC_ATTR(b_hnp_enable);
412	static USB_UDC_ATTR(a_hnp_support);
413	static USB_UDC_ATTR(a_alt_hnp_support);
414
415	static struct attribute *usb_udc_attrs[] = {
416	&dev_attr_srp.attr,
417	&dev_attr_soft_connect.attr,
418	&dev_attr_speed.attr,
419
420	&dev_attr_is_dualspeed.attr,
421	&dev_attr_is_otg.attr,
422	&dev_attr_is_a_peripheral.attr,
423	&dev_attr_b_hnp_enable.attr,
424	&dev_attr_a_hnp_support.attr,
425	&dev_attr_a_alt_hnp_support.attr,
426	NULL,
427	};
428
429	static const struct attribute_group usb_udc_attr_group = {
430	.attrs = usb_udc_attrs,
431	};
432
433	static const struct attribute_group *usb_udc_attr_groups[] = {
434	&usb_udc_attr_group,
435	NULL,
436	};
437
438	static int usb_udc_uevent(struct device dev, struct kobj_uevent_env env)
439	{
440	struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
441	int ret;
442
443	ret = add_uevent_var(env, "USB_UDC_NAME=%s", udc->gadget->name);
444	if (ret) {
445	dev_err(dev, "failed to add uevent USB_UDC_NAME\n");
446	return ret;
447	}
448
449	if (udc->driver) {
450	ret = add_uevent_var(env, "USB_UDC_DRIVER=%s",
451	udc->driver->function);
452	if (ret) {
453	dev_err(dev, "failed to add uevent USB_UDC_DRIVER\n");
454	return ret;
455	}
456	}
457
458	return 0;
459	}
460
461	static int __init usb_udc_init(void)
462	{
463	udc_class = class_create(THIS_MODULE, "udc");
464	if (IS_ERR(udc_class)) {
465	pr_err("failed to create udc class --> %ld\n",
466	PTR_ERR(udc_class));
467	return PTR_ERR(udc_class);
468	}
469
470	udc_class->dev_uevent = usb_udc_uevent;
471	udc_device_type.groups = usb_udc_attr_groups;
472
473	return 0;
474	}
475	subsys_initcall(usb_udc_init);
476
477	static void __exit usb_udc_exit(void)
478	{
479	class_destroy(udc_class);
480	}
481	module_exit(usb_udc_exit);
482
483	MODULE_DESCRIPTION("UDC Framework");
484	MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
485	MODULE_LICENSE("GPL v2");