[deliverable/linux.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/dma-mapping.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 LIST_HEAD(udc_list);
static DEFINE_MUTEX(udc_lock);

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

int usb_gadget_map_request(struct usb_gadget *gadget,
		struct usb_request *req, int is_in)
{
	if (req->length == 0)
		return 0;

	if (req->num_sgs) {
		int     mapped;

		mapped = dma_map_sg(&gadget->dev, req->sg, req->num_sgs,
				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
		if (mapped == 0) {
			dev_err(&gadget->dev, "failed to map SGs\n");
			return -EFAULT;
		}

		req->num_mapped_sgs = mapped;
	} else {
		req->dma = dma_map_single(&gadget->dev, req->buf, req->length,
				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);

		if (dma_mapping_error(&gadget->dev, req->dma)) {
			dev_err(&gadget->dev, "failed to map buffer\n");
			return -EFAULT;
		}
	}

	return 0;
}
EXPORT_SYMBOL_GPL(usb_gadget_map_request);

void usb_gadget_unmap_request(struct usb_gadget *gadget,
		struct usb_request *req, int is_in)
{
	if (req->length == 0)
		return;

	if (req->num_mapped_sgs) {
		dma_unmap_sg(&gadget->dev, req->sg, req->num_mapped_sgs,
				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);

		req->num_mapped_sgs = 0;
	} else {
		dma_unmap_single(&gadget->dev, req->dma, req->length,
				is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
	}
}
EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);

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

/**
 * 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);
}

static const struct attribute_group *usb_udc_attr_groups[];
/**
 * 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.groups = usb_udc_attr_groups;
	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)) {
		udc->driver->disconnect(udc->gadget);
		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 = container_of(dev, struct usb_udc, 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 = container_of(dev, struct usb_udc, dev);

	if (sysfs_streq(buf, "connect")) {
		if (udc_is_newstyle(udc))
			usb_gadget_udc_start(udc->gadget, udc->driver);
		usb_gadget_connect(udc->gadget);
	} else if (sysfs_streq(buf, "disconnect")) {
		usb_gadget_disconnect(udc->gadget);
		if (udc_is_newstyle(udc))
			usb_gadget_udc_stop(udc->gadget, udc->driver);
	} 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);

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

static USB_UDC_SPEED_ATTR(current_speed, speed);
static USB_UDC_SPEED_ATTR(maximum_speed, max_speed);

/* TODO: Scheduled for removal in 3.8. */
static ssize_t usb_udc_is_dualspeed_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct usb_udc		*udc = container_of(dev, struct usb_udc, dev);
	return snprintf(buf, PAGE_SIZE, "%d\n",
			gadget_is_dualspeed(udc->gadget));
}
static DEVICE_ATTR(is_dualspeed, S_IRUSR, usb_udc_is_dualspeed_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 = container_of(dev, struct usb_udc, dev); \
	struct usb_gadget	*gadget = udc->gadget;		\
								\
	return snprintf(buf, PAGE_SIZE, "%d\n", gadget->name);	\
}								\
static DEVICE_ATTR(name, S_IRUGO, usb_udc_##name##_show, NULL)

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_current_speed.attr,
	&dev_attr_maximum_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;
	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>
a698908d	25	#include <linux/dma-mapping.h>
2ccea03a FB	26
	27	#include <linux/usb/ch9.h>
	28	#include <linux/usb/gadget.h>
	29
	30	/**
	31	* struct usb_udc - describes one usb device controller
	32	* @driver - the gadget driver pointer. For use by the class code
	33	* @dev - the child device to the actual controller
	34	* @gadget - the gadget. For use by the class code
	35	* @list - for use by the udc class driver
	36	*
	37	* This represents the internal data structure which is used by the UDC-class
	38	* to hold information about udc driver and gadget together.
	39	*/
	40	struct usb_udc {
	41	struct usb_gadget_driver *driver;
	42	struct usb_gadget *gadget;
	43	struct device dev;
	44	struct list_head list;
	45	};
	46
	47	static struct class *udc_class;
2ccea03a FB	48	static LIST_HEAD(udc_list);
	49	static DEFINE_MUTEX(udc_lock);
	50
	51	/* ------------------------------------------------------------------------- */
	52
a698908d FB	53	int usb_gadget_map_request(struct usb_gadget *gadget,
	54	struct usb_request *req, int is_in)
	55	{
	56	if (req->length == 0)
	57	return 0;
	58
	59	if (req->num_sgs) {
	60	int mapped;
	61
	62	mapped = dma_map_sg(&gadget->dev, req->sg, req->num_sgs,
	63	is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
	64	if (mapped == 0) {
	65	dev_err(&gadget->dev, "failed to map SGs\n");
	66	return -EFAULT;
	67	}
	68
	69	req->num_mapped_sgs = mapped;
	70	} else {
	71	req->dma = dma_map_single(&gadget->dev, req->buf, req->length,
	72	is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
	73
	74	if (dma_mapping_error(&gadget->dev, req->dma)) {
	75	dev_err(&gadget->dev, "failed to map buffer\n");
	76	return -EFAULT;
	77	}
	78	}
	79
	80	return 0;
	81	}
	82	EXPORT_SYMBOL_GPL(usb_gadget_map_request);
	83
	84	void usb_gadget_unmap_request(struct usb_gadget *gadget,
	85	struct usb_request *req, int is_in)
	86	{
	87	if (req->length == 0)
	88	return;
	89
	90	if (req->num_mapped_sgs) {
	91	dma_unmap_sg(&gadget->dev, req->sg, req->num_mapped_sgs,
	92	is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
	93
	94	req->num_mapped_sgs = 0;
	95	} else {
	96	dma_unmap_single(&gadget->dev, req->dma, req->length,
	97	is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
	98	}
	99	}
	100	EXPORT_SYMBOL_GPL(usb_gadget_unmap_request);
	101
	102	/* ------------------------------------------------------------------------- */
	103
2ccea03a FB	104	/**
	105	* usb_gadget_start - tells usb device controller to start up
	106	* @gadget: The gadget we want to get started
	107	* @driver: The driver we want to bind to @gadget
	108	* @bind: The bind function for @driver
	109	*
	110	* This call is issued by the UDC Class driver when it's about
	111	* to register a gadget driver to the device controller, before
	112	* calling gadget driver's bind() method.
	113	*
	114	* It allows the controller to be powered off until strictly
	115	* necessary to have it powered on.
	116	*
	117	* Returns zero on success, else negative errno.
	118	*/
	119	static inline int usb_gadget_start(struct usb_gadget *gadget,
	120	struct usb_gadget_driver *driver,
	121	int (bind)(struct usb_gadget ))
	122	{
	123	return gadget->ops->start(driver, bind);
	124	}
	125
352c2dc8 SAS	126	/**
	127	* usb_gadget_udc_start - tells usb device controller to start up
	128	* @gadget: The gadget we want to get started
	129	* @driver: The driver we want to bind to @gadget
	130	*
	131	* This call is issued by the UDC Class driver when it's about
	132	* to register a gadget driver to the device controller, before
	133	* calling gadget driver's bind() method.
	134	*
	135	* It allows the controller to be powered off until strictly
	136	* necessary to have it powered on.
	137	*
	138	* Returns zero on success, else negative errno.
	139	*/
	140	static inline int usb_gadget_udc_start(struct usb_gadget *gadget,
	141	struct usb_gadget_driver *driver)
	142	{
	143	return gadget->ops->udc_start(gadget, driver);
	144	}
	145
2ccea03a FB	146	/**
	147	* usb_gadget_stop - tells usb device controller we don't need it anymore
	148	* @gadget: The device we want to stop activity
	149	* @driver: The driver to unbind from @gadget
	150	*
	151	* This call is issued by the UDC Class driver after calling
	152	* gadget driver's unbind() method.
	153	*
	154	* The details are implementation specific, but it can go as
	155	* far as powering off UDC completely and disable its data
	156	* line pullups.
	157	*/
	158	static inline void usb_gadget_stop(struct usb_gadget *gadget,
	159	struct usb_gadget_driver *driver)
	160	{
	161	gadget->ops->stop(driver);
	162	}
	163
352c2dc8 SAS	164	/**
	165	* usb_gadget_udc_stop - tells usb device controller we don't need it anymore
	166	* @gadget: The device we want to stop activity
	167	* @driver: The driver to unbind from @gadget
	168	*
	169	* This call is issued by the UDC Class driver after calling
	170	* gadget driver's unbind() method.
	171	*
	172	* The details are implementation specific, but it can go as
	173	* far as powering off UDC completely and disable its data
	174	* line pullups.
	175	*/
	176	static inline void usb_gadget_udc_stop(struct usb_gadget *gadget,
	177	struct usb_gadget_driver *driver)
	178	{
	179	gadget->ops->udc_stop(gadget, driver);
	180	}
	181
2ccea03a FB	182	/**
	183	* usb_udc_release - release the usb_udc struct
	184	* @dev: the dev member within usb_udc
	185	*
	186	* This is called by driver's core in order to free memory once the last
	187	* reference is released.
	188	*/
	189	static void usb_udc_release(struct device *dev)
	190	{
	191	struct usb_udc *udc;
	192
	193	udc = container_of(dev, struct usb_udc, dev);
	194	dev_dbg(dev, "releasing '%s'\n", dev_name(dev));
	195	kfree(udc);
	196	}
	197
019f976e	198	static const struct attribute_group *usb_udc_attr_groups[];
2ccea03a FB	199	/**
	200	* usb_add_gadget_udc - adds a new gadget to the udc class driver list
	201	* @parent: the parent device to this udc. Usually the controller
	202	* driver's device.
	203	* @gadget: the gadget to be added to the list
	204	*
	205	* Returns zero on success, negative errno otherwise.
	206	*/
	207	int usb_add_gadget_udc(struct device parent, struct usb_gadget gadget)
	208	{
	209	struct usb_udc *udc;
	210	int ret = -ENOMEM;
	211
	212	udc = kzalloc(sizeof(*udc), GFP_KERNEL);
	213	if (!udc)
	214	goto err1;
	215
	216	device_initialize(&udc->dev);
	217	udc->dev.release = usb_udc_release;
	218	udc->dev.class = udc_class;
019f976e	219	udc->dev.groups = usb_udc_attr_groups;
2ccea03a FB	220	udc->dev.parent = parent;
	221	ret = dev_set_name(&udc->dev, "%s", kobject_name(&parent->kobj));
	222	if (ret)
	223	goto err2;
	224
	225	udc->gadget = gadget;
	226
	227	mutex_lock(&udc_lock);
	228	list_add_tail(&udc->list, &udc_list);
	229
	230	ret = device_add(&udc->dev);
	231	if (ret)
	232	goto err3;
	233
	234	mutex_unlock(&udc_lock);
	235
	236	return 0;
	237	err3:
	238	list_del(&udc->list);
	239	mutex_unlock(&udc_lock);
	240
	241	err2:
	242	put_device(&udc->dev);
	243
	244	err1:
	245	return ret;
	246	}
	247	EXPORT_SYMBOL_GPL(usb_add_gadget_udc);
	248
352c2dc8 SAS	249	static int udc_is_newstyle(struct usb_udc *udc)
	250	{
	251	if (udc->gadget->ops->udc_start && udc->gadget->ops->udc_stop)
	252	return 1;
	253	return 0;
	254	}
	255
	256
2ccea03a FB	257	static void usb_gadget_remove_driver(struct usb_udc *udc)
	258	{
	259	dev_dbg(&udc->dev, "unregistering UDC driver [%s]\n",
	260	udc->gadget->name);
	261
	262	kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
	263
352c2dc8	264	if (udc_is_newstyle(udc)) {
6f39504d	265	udc->driver->disconnect(udc->gadget);
6f39504d	266	usb_gadget_disconnect(udc->gadget);
320cd1e7	267	udc->driver->unbind(udc->gadget);
8ae8090c	268	usb_gadget_udc_stop(udc->gadget, udc->driver);
352c2dc8 SAS	269	} else {
	270	usb_gadget_stop(udc->gadget, udc->driver);
	271	}
2ccea03a FB	272
	273	udc->driver = NULL;
	274	udc->dev.driver = NULL;
	275	}
	276
	277	/**
	278	* usb_del_gadget_udc - deletes @udc from udc_list
	279	* @gadget: the gadget to be removed.
	280	*
	281	* This, will call usb_gadget_unregister_driver() if
	282	* the @udc is still busy.
	283	*/
	284	void usb_del_gadget_udc(struct usb_gadget *gadget)
	285	{
	286	struct usb_udc *udc = NULL;
	287
	288	mutex_lock(&udc_lock);
	289	list_for_each_entry(udc, &udc_list, list)
	290	if (udc->gadget == gadget)
	291	goto found;
	292
	293	dev_err(gadget->dev.parent, "gadget not registered.\n");
	294	mutex_unlock(&udc_lock);
	295
	296	return;
	297
	298	found:
	299	dev_vdbg(gadget->dev.parent, "unregistering gadget\n");
	300
	301	list_del(&udc->list);
	302	mutex_unlock(&udc_lock);
	303
	304	if (udc->driver)
	305	usb_gadget_remove_driver(udc);
	306
	307	kobject_uevent(&udc->dev.kobj, KOBJ_REMOVE);
	308	device_unregister(&udc->dev);
	309	}
	310	EXPORT_SYMBOL_GPL(usb_del_gadget_udc);
	311
	312	/* ------------------------------------------------------------------------- */
	313
	314	int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
	315	int (bind)(struct usb_gadget ))
	316	{
	317	struct usb_udc *udc = NULL;
	318	int ret;
	319
	320	if (!driver \|\| !bind \|\| !driver->setup)
	321	return -EINVAL;
	322
	323	mutex_lock(&udc_lock);
	324	list_for_each_entry(udc, &udc_list, list) {
	325	/* For now we take the first one */
	326	if (!udc->driver)
	327	goto found;
	328	}
	329
	330	pr_debug("couldn't find an available UDC\n");
	331	mutex_unlock(&udc_lock);
	332	return -ENODEV;
	333
	334	found:
	335	dev_dbg(&udc->dev, "registering UDC driver [%s]\n",
336	driver->function);
337
338	udc->driver = driver;
339	udc->dev.driver = &driver->driver;
340
352c2dc8 SAS	341	if (udc_is_newstyle(udc)) {
	342	ret = bind(udc->gadget);
	343	if (ret)
	344	goto err1;
	345	ret = usb_gadget_udc_start(udc->gadget, driver);
	346	if (ret) {
	347	driver->unbind(udc->gadget);
	348	goto err1;
	349	}
	350	usb_gadget_connect(udc->gadget);
	351	} else {
	352
	353	ret = usb_gadget_start(udc->gadget, driver, bind);
	354	if (ret)
	355	goto err1;
	356
	357	}
2ccea03a FB	358
	359	kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
	360	mutex_unlock(&udc_lock);
	361	return 0;
	362
	363	err1:
	364	dev_err(&udc->dev, "failed to start %s: %d\n",
	365	udc->driver->function, ret);
	366	udc->driver = NULL;
	367	udc->dev.driver = NULL;
	368	mutex_unlock(&udc_lock);
	369	return ret;
	370	}
	371	EXPORT_SYMBOL_GPL(usb_gadget_probe_driver);
	372
	373	int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
	374	{
	375	struct usb_udc *udc = NULL;
	376	int ret = -ENODEV;
	377
	378	if (!driver \|\| !driver->unbind)
	379	return -EINVAL;
	380
	381	mutex_lock(&udc_lock);
	382	list_for_each_entry(udc, &udc_list, list)
	383	if (udc->driver == driver) {
	384	usb_gadget_remove_driver(udc);
	385	ret = 0;
	386	break;
	387	}
	388
	389	mutex_unlock(&udc_lock);
	390	return ret;
	391	}
	392	EXPORT_SYMBOL_GPL(usb_gadget_unregister_driver);
	393
	394	/* ------------------------------------------------------------------------- */
	395
	396	static ssize_t usb_udc_srp_store(struct device *dev,
	397	struct device_attribute attr, const char buf, size_t n)
	398	{
1d91a962	399	struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
2ccea03a FB	400
	401	if (sysfs_streq(buf, "1"))
	402	usb_gadget_wakeup(udc->gadget);
	403
	404	return n;
	405	}
	406	static DEVICE_ATTR(srp, S_IWUSR, NULL, usb_udc_srp_store);
	407
	408	static ssize_t usb_udc_softconn_store(struct device *dev,
	409	struct device_attribute attr, const char buf, size_t n)
	410	{
865569ba	411	struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
2ccea03a FB	412
2ccea03a FB	413	if (sysfs_streq(buf, "connect")) {
6d258a4c FB	414	if (udc_is_newstyle(udc))
6d258a4c FB	415	usb_gadget_udc_start(udc->gadget, udc->driver);
2ccea03a FB	416	usb_gadget_connect(udc->gadget);
2ccea03a FB	417	} else if (sysfs_streq(buf, "disconnect")) {
83a787a7	418	usb_gadget_disconnect(udc->gadget);
6d258a4c FB	419	if (udc_is_newstyle(udc))
6d258a4c FB	420	usb_gadget_udc_stop(udc->gadget, udc->driver);
2ccea03a FB	421	} else {
	422	dev_err(dev, "unsupported command '%s'\n", buf);
	423	return -EINVAL;
	424	}
	425
	426	return n;
	427	}
	428	static DEVICE_ATTR(soft_connect, S_IWUSR, NULL, usb_udc_softconn_store);
	429
d327ab5b MN	430	#define USB_UDC_SPEED_ATTR(name, param) \
	431	ssize_t usb_udc_##param##_show(struct device *dev, \
	432	struct device_attribute attr, char buf) \
	433	{ \
	434	struct usb_udc *udc = container_of(dev, struct usb_udc, dev); \
	435	return snprintf(buf, PAGE_SIZE, "%s\n", \
	436	usb_speed_string(udc->gadget->param)); \
	437	} \
	438	static DEVICE_ATTR(name, S_IRUSR, usb_udc_##param##_show, NULL)
	439
	440	static USB_UDC_SPEED_ATTR(current_speed, speed);
	441	static USB_UDC_SPEED_ATTR(maximum_speed, max_speed);
	442
	443	/* TODO: Scheduled for removal in 3.8. */
	444	static ssize_t usb_udc_is_dualspeed_show(struct device *dev,
2ccea03a FB	445	struct device_attribute attr, char buf)
2ccea03a FB	446	{
019f976e	447	struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
d327ab5b MN	448	return snprintf(buf, PAGE_SIZE, "%d\n",
d327ab5b MN	449	gadget_is_dualspeed(udc->gadget));
2ccea03a	450	}
d327ab5b	451	static DEVICE_ATTR(is_dualspeed, S_IRUSR, usb_udc_is_dualspeed_show, NULL);
2ccea03a FB	452
	453	#define USB_UDC_ATTR(name) \
	454	ssize_t usb_udc_##name##_show(struct device *dev, \
	455	struct device_attribute attr, char buf) \
	456	{ \
019f976e	457	struct usb_udc *udc = container_of(dev, struct usb_udc, dev); \
2ccea03a FB	458	struct usb_gadget *gadget = udc->gadget; \
	459	\
	460	return snprintf(buf, PAGE_SIZE, "%d\n", gadget->name); \
	461	} \
59d81f81	462	static DEVICE_ATTR(name, S_IRUGO, usb_udc_##name##_show, NULL)
2ccea03a	463
2ccea03a FB	464	static USB_UDC_ATTR(is_otg);
	465	static USB_UDC_ATTR(is_a_peripheral);
	466	static USB_UDC_ATTR(b_hnp_enable);
	467	static USB_UDC_ATTR(a_hnp_support);
	468	static USB_UDC_ATTR(a_alt_hnp_support);
	469
	470	static struct attribute *usb_udc_attrs[] = {
	471	&dev_attr_srp.attr,
	472	&dev_attr_soft_connect.attr,
d327ab5b MN	473	&dev_attr_current_speed.attr,
d327ab5b MN	474	&dev_attr_maximum_speed.attr,
2ccea03a FB	475
	476	&dev_attr_is_dualspeed.attr,
	477	&dev_attr_is_otg.attr,
	478	&dev_attr_is_a_peripheral.attr,
	479	&dev_attr_b_hnp_enable.attr,
	480	&dev_attr_a_hnp_support.attr,
	481	&dev_attr_a_alt_hnp_support.attr,
	482	NULL,
	483	};
	484
	485	static const struct attribute_group usb_udc_attr_group = {
	486	.attrs = usb_udc_attrs,
	487	};
	488
	489	static const struct attribute_group *usb_udc_attr_groups[] = {
	490	&usb_udc_attr_group,
	491	NULL,
	492	};
	493
	494	static int usb_udc_uevent(struct device dev, struct kobj_uevent_env env)
	495	{
	496	struct usb_udc *udc = container_of(dev, struct usb_udc, dev);
	497	int ret;
	498
	499	ret = add_uevent_var(env, "USB_UDC_NAME=%s", udc->gadget->name);
	500	if (ret) {
	501	dev_err(dev, "failed to add uevent USB_UDC_NAME\n");
	502	return ret;
	503	}
	504
	505	if (udc->driver) {
	506	ret = add_uevent_var(env, "USB_UDC_DRIVER=%s",
	507	udc->driver->function);
	508	if (ret) {
	509	dev_err(dev, "failed to add uevent USB_UDC_DRIVER\n");
	510	return ret;
	511	}
	512	}
	513
	514	return 0;
	515	}
	516
	517	static int __init usb_udc_init(void)
	518	{
	519	udc_class = class_create(THIS_MODULE, "udc");
	520	if (IS_ERR(udc_class)) {
	521	pr_err("failed to create udc class --> %ld\n",
	522	PTR_ERR(udc_class));
	523	return PTR_ERR(udc_class);
	524	}
	525
	526	udc_class->dev_uevent = usb_udc_uevent;
2ccea03a FB	527	return 0;
	528	}
	529	subsys_initcall(usb_udc_init);
	530
	531	static void __exit usb_udc_exit(void)
	532	{
	533	class_destroy(udc_class);
	534	}
	535	module_exit(usb_udc_exit);
	536
	537	MODULE_DESCRIPTION("UDC Framework");
	538	MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
	539	MODULE_LICENSE("GPL v2");