usb: renesas_usbhs: Add Renesas USBHS Gadget

This patch add usb gadget code to SuperH USBHS.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/Kconfig

@@ -260,6 +260,24 @@ config USB_R8A66597
 	default USB_GADGET
 	select USB_GADGET_SELECTED
 
+config USB_GADGET_RENESAS_USBHS
+	boolean "Renesas USBHS"
+	depends on USB_RENESAS_USBHS
+	select USB_GADGET_DUALSPEED
+	help
+	   Renesas USBHS is a discrete USB host and peripheral controller
+	   chip that supports both full and high speed USB 2.0 data transfers.
+	   platform is able to configure endpoint (pipe) style
+
+	   Say "y" to enable the gadget specific portion of the USBHS driver.
+
+
+config USB_RENESAS_USBHS_UDC
+	tristate
+	depends on USB_GADGET_RENESAS_USBHS
+	default USB_GADGET
+	select USB_GADGET_SELECTED
+
 config USB_GADGET_PXA27X
 	boolean "PXA 27x"
 	depends on ARCH_PXA && (PXA27x || PXA3xx)

drivers/usb/gadget/gadget_chips.h

@@ -148,6 +148,12 @@
 #define gadget_is_ci13xxx_msm(g)	0
 #endif
 
+#ifdef CONFIG_USB_GADGET_RENESAS_USBHS
+#define	gadget_is_renesas_usbhs(g) (!strcmp("renesas_usbhs_udc", (g)->name))
+#else
+#define	gadget_is_renesas_usbhs(g) 0
+#endif
+
 /**
  * usb_gadget_controller_number - support bcdDevice id convention
  * @gadget: the controller being driven
@@ -207,6 +213,9 @@ static inline int usb_gadget_controller_number(struct usb_gadget *gadget)
 		return 0x27;
 	else if (gadget_is_ci13xxx_msm(gadget))
 		return 0x28;
+	else if (gadget_is_renesas_usbhs(gadget))
+		return 0x29;
+
 	return -ENOENT;
 }
 

drivers/usb/renesas_usbhs/Makefile

@@ -5,3 +5,5 @@
 obj-$(CONFIG_USB_RENESAS_USBHS)	+= renesas_usbhs.o
 
 renesas_usbhs-y			:= common.o mod.o pipe.o
+
+renesas_usbhs-$(CONFIG_USB_RENESAS_USBHS_UDC)	+= mod_gadget.o

drivers/usb/renesas_usbhs/mod.c

@@ -94,17 +94,32 @@ int usbhs_mod_probe(struct usbhs_priv *priv)
 	struct device *dev = usbhs_priv_to_dev(priv);
 	int ret;
 
+	/*
+	 * install host/gadget driver
+	 */
+	ret = usbhs_mod_gadget_probe(priv);
+	if (ret < 0)
+		return ret;
+
 	/* irq settings */
 	ret = request_irq(priv->irq, usbhs_interrupt,
 			  IRQF_DISABLED, dev_name(dev), priv);
-	if (ret)
+	if (ret) {
 		dev_err(dev, "irq request err\n");
+		goto mod_init_gadget_err;
+	}
+
+	return ret;
+
+mod_init_gadget_err:
+	usbhs_mod_gadget_remove(priv);
 
 	return ret;
 }
 
 void usbhs_mod_remove(struct usbhs_priv *priv)
 {
+	usbhs_mod_gadget_remove(priv);
 	free_irq(priv->irq, priv);
 }
 

drivers/usb/renesas_usbhs/mod.h

@@ -103,4 +103,20 @@ void usbhs_irq_callback_update(struct usbhs_priv *priv, struct usbhs_mod *mod);
 		 mod->func(param);			\
 	})
 
+/*
+ * gadget control
+ */
+#ifdef CONFIG_USB_RENESAS_USBHS_UDC
+extern int __devinit usbhs_mod_gadget_probe(struct usbhs_priv *priv);
+extern void __devexit usbhs_mod_gadget_remove(struct usbhs_priv *priv);
+#else
+static inline int usbhs_mod_gadget_probe(struct usbhs_priv *priv)
+{
+	return 0;
+}
+static inline void usbhs_mod_gadget_remove(struct usbhs_priv *priv)
+{
+}
+#endif
+
 #endif /* RENESAS_USB_MOD_H */

drivers/usb/renesas_usbhs/mod_gadget.c

+/*
+ * Renesas USB driver
+ *
+ * Copyright (C) 2011 Renesas Solutions Corp.
+ * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include "common.h"
+
+/*
+ *		struct
+ */
+struct usbhsg_request {
+	struct usb_request	req;
+	struct list_head	node;
+};
+
+#define EP_NAME_SIZE 8
+struct usbhsg_gpriv;
+struct usbhsg_pipe_handle;
+struct usbhsg_uep {
+	struct usb_ep		 ep;
+	struct usbhs_pipe	*pipe;
+	struct list_head	 list;
+
+	char ep_name[EP_NAME_SIZE];
+
+	struct usbhsg_gpriv *gpriv;
+	struct usbhsg_pipe_handle *handler;
+};
+
+struct usbhsg_gpriv {
+	struct usb_gadget	 gadget;
+	struct usbhs_mod	 mod;
+
+	struct usbhsg_uep	*uep;
+	int			 uep_size;
+
+	struct usb_gadget_driver	*driver;
+
+	u32	status;
+#define USBHSG_STATUS_STARTED		(1 << 0)
+#define USBHSG_STATUS_REGISTERD		(1 << 1)
+#define USBHSG_STATUS_WEDGE		(1 << 2)
+};
+
+struct usbhsg_pipe_handle {
+	int (*prepare)(struct usbhsg_uep *uep, struct usbhsg_request *ureq);
+	int (*try_run)(struct usbhsg_uep *uep, struct usbhsg_request *ureq);
+	void (*irq_mask)(struct usbhsg_uep *uep, int enable);
+};
+
+struct usbhsg_recip_handle {
+	char *name;
+	int (*device)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
+		      struct usb_ctrlrequest *ctrl);
+	int (*interface)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
+			 struct usb_ctrlrequest *ctrl);
+	int (*endpoint)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
+			struct usb_ctrlrequest *ctrl);
+};
+
+/*
+ *		macro
+ */
+#define usbhsg_priv_to_gpriv(priv)			\
+	container_of(					\
+		usbhs_mod_get(priv, USBHS_GADGET),	\
+		struct usbhsg_gpriv, mod)
+
+#define __usbhsg_for_each_uep(start, pos, g, i)	\
+	for (i = start, pos = (g)->uep;		\
+	     i < (g)->uep_size;			\
+	     i++, pos = (g)->uep + i)
+
+#define usbhsg_for_each_uep(pos, gpriv, i)	\
+	__usbhsg_for_each_uep(1, pos, gpriv, i)
+
+#define usbhsg_for_each_uep_with_dcp(pos, gpriv, i)	\
+	__usbhsg_for_each_uep(0, pos, gpriv, i)
+
+#define usbhsg_gadget_to_gpriv(g)\
+	container_of(g, struct usbhsg_gpriv, gadget)
+
+#define usbhsg_req_to_ureq(r)\
+	container_of(r, struct usbhsg_request, req)
+
+#define usbhsg_ep_to_uep(e)		container_of(e, struct usbhsg_uep, ep)
+#define usbhsg_gpriv_to_lock(gp)	usbhs_priv_to_lock((gp)->mod.priv)
+#define usbhsg_gpriv_to_dev(gp)		usbhs_priv_to_dev((gp)->mod.priv)
+#define usbhsg_gpriv_to_priv(gp)	((gp)->mod.priv)
+#define usbhsg_gpriv_to_dcp(gp)		((gp)->uep)
+#define usbhsg_gpriv_to_nth_uep(gp, i)	((gp)->uep + i)
+#define usbhsg_uep_to_gpriv(u)		((u)->gpriv)
+#define usbhsg_uep_to_pipe(u)		((u)->pipe)
+#define usbhsg_pipe_to_uep(p)		((p)->mod_private)
+#define usbhsg_is_dcp(u)		((u) == usbhsg_gpriv_to_dcp((u)->gpriv))
+
+#define usbhsg_is_not_connected(gp) ((gp)->gadget.speed == USB_SPEED_UNKNOWN)
+
+/* status */
+#define usbhsg_status_init(gp)   do {(gp)->status = 0; } while (0)
+#define usbhsg_status_set(gp, b) (gp->status |=  b)
+#define usbhsg_status_clr(gp, b) (gp->status &= ~b)
+#define usbhsg_status_has(gp, b) (gp->status &   b)
+
+/*
+ *		list push/pop
+ */
+static void usbhsg_queue_push(struct usbhsg_uep *uep,
+			      struct usbhsg_request *ureq)
+{
+	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
+	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
+	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
+
+	/*
+	 *********  assume under spin lock  *********
+	 */
+	list_del_init(&ureq->node);
+	list_add_tail(&ureq->node, &uep->list);
+	ureq->req.actual = 0;
+	ureq->req.status = -EINPROGRESS;
+
+	dev_dbg(dev, "pipe %d : queue push (%d)\n",
+		usbhs_pipe_number(pipe),
+		ureq->req.length);
+}
+
+static struct usbhsg_request *usbhsg_queue_get(struct usbhsg_uep *uep)
+{
+	/*
+	 *********  assume under spin lock  *********
+	 */
+	if (list_empty(&uep->list))
+		return NULL;
+
+	return list_entry(uep->list.next, struct usbhsg_request, node);
+}
+
+#define usbhsg_queue_prepare(uep) __usbhsg_queue_handler(uep, 1);
+#define usbhsg_queue_handle(uep)  __usbhsg_queue_handler(uep, 0);
+static int __usbhsg_queue_handler(struct usbhsg_uep *uep, int prepare)
+{
+	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
+	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
+	struct usbhsg_request *ureq;
+	spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv);
+	unsigned long flags;
+	int is_locked;
+	int ret = 0;
+
+	if (!uep->handler) {
+		dev_err(dev, "no handler function\n");
+		return -EIO;
+	}
+
+	/*
+	 * CAUTION [*queue handler*]
+	 *
+	 * This function will be called for start/restart queue operation.
+	 * OTOH the most much worry for USB driver is spinlock nest.
+	 * Specially it are
+	 *   - usb_ep_ops  :: queue
+	 *   - usb_request :: complete
+	 *
+	 * But the caller of this function need not care about spinlock.
+	 * This function is using spin_trylock_irqsave for it.
+	 * if "is_locked" is 1, this mean this function lock it.
+	 * but if it is 0, this mean it is already under spin lock.
+	 * see also
+	 *   CAUTION [*endpoint queue*]
+	 *   CAUTION [*request complete*]
+	 */
+
+	/******************  spin try lock *******************/
+	is_locked = spin_trylock_irqsave(lock, flags);
+	ureq = usbhsg_queue_get(uep);
+	if (ureq) {
+		if (prepare)
+			ret = uep->handler->prepare(uep, ureq);
+		else
+			ret = uep->handler->try_run(uep, ureq);
+	}
+	if (is_locked)
+		spin_unlock_irqrestore(lock, flags);
+	/********************  spin unlock ******************/
+
+	return ret;
+}
+
+static void usbhsg_queue_pop(struct usbhsg_uep *uep,
+			     struct usbhsg_request *ureq,
+			     int status)
+{
+	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
+	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
+	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
+
+	/*
+	 *********  assume under spin lock  *********
+	 */
+
+	/*
+	 * CAUTION [*request complete*]
+	 *
+	 * There is a possibility not to be called in correct order
+	 * if "complete" is called without spinlock.
+	 *
+	 * So, this function assume it is under spinlock,
+	 * and call usb_request :: complete.
+	 *
+	 * But this "complete" will push next usb_request.
+	 * It mean "usb_ep_ops :: queue" which is using spinlock is called
+	 * under spinlock.
+	 *
+	 * To avoid dead-lock, this driver is using spin_trylock.
+	 *   CAUTION [*endpoint queue*]
+	 *   CAUTION [*queue handler*]
+	 */
+
+	dev_dbg(dev, "pipe %d : queue pop\n", usbhs_pipe_number(pipe));
+
+	list_del_init(&ureq->node);
+
+	ureq->req.status = status;
+	ureq->req.complete(&uep->ep, &ureq->req);
+
+	/* more request ? */
+	if (0 == status)
+		usbhsg_queue_prepare(uep);
+}
+
+/*
+ *		irq enable/disable function
+ */
+#define usbhsg_irq_callback_ctrl(uep, status, enable)			\
+	({								\
+		struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);	\
+		struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);	\
+		struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);	\
+		struct usbhs_mod *mod = usbhs_mod_get_current(priv);	\
+		if (!mod)						\
+			return;						\
+		if (enable)						\
+			mod->irq_##status |= (1 << usbhs_pipe_number(pipe)); \
+		else							\
+			mod->irq_##status &= ~(1 << usbhs_pipe_number(pipe)); \
+		usbhs_irq_callback_update(priv, mod);			\
+	})
+
+static void usbhsg_irq_empty_ctrl(struct usbhsg_uep *uep, int enable)
+{
+	usbhsg_irq_callback_ctrl(uep, bempsts, enable);
+}
+
+static void usbhsg_irq_ready_ctrl(struct usbhsg_uep *uep, int enable)
+{
+	usbhsg_irq_callback_ctrl(uep, brdysts, enable);
+}
+
+/*
+ *		handler function
+ */
+static int usbhsg_try_run_ctrl_stage_end(struct usbhsg_uep *uep,
+					 struct usbhsg_request *ureq)
+{
+	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
+
+	/*
+	 *********  assume under spin lock  *********
+	 */
+
+	usbhs_dcp_control_transfer_done(pipe);
+	usbhsg_queue_pop(uep, ureq, 0);
+
+	return 0;
+}
+
+static int usbhsg_try_run_send_packet(struct usbhsg_uep *uep,
+				      struct usbhsg_request *ureq)
+{
+	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
+	struct usb_request *req = &ureq->req;
+	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
+	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
+	void *buf;
+	int remainder, send;
+	int is_done = 0;
+	int enable;
+	int maxp;
+
+	/*
+	 *********  assume under spin lock  *********
+	 */
+
+	maxp		= usbhs_pipe_get_maxpacket(pipe);
+	buf		= req->buf    + req->actual;
+	remainder	= req->length - req->actual;
+
+	send = usbhs_fifo_write(pipe, buf, remainder);
+
+	/*
+	 * send < 0 : pipe busy
+	 * send = 0 : send zero packet
+	 * send > 0 : send data
+	 *
+	 * send <= max_packet
+	 */
+	if (send > 0)
+		req->actual += send;
+
+	/* send all packet ? */
+	if (send < remainder)
+		is_done = 0;		/* there are remainder data */
+	else if (send < maxp)
+		is_done = 1;		/* short packet */
+	else
+		is_done = !req->zero;	/* send zero packet ? */
+
+	dev_dbg(dev, "  send %d (%d/ %d/ %d/ %d)\n",
+		usbhs_pipe_number(pipe),
+		remainder, send, is_done, req->zero);
+
+	/*
+	 * enable interrupt and send again in irq handler
+	 * if it still have remainder data which should be sent.
+	 */
+	enable = !is_done;
+	uep->handler->irq_mask(uep, enable);
+
+	/*
+	 * usbhs_fifo_enable execute
+	 *  - after callback_update,
+	 *  - before queue_pop / stage_end
+	 */
+	usbhs_fifo_enable(pipe);
+
+	/*
+	 * all data were sent ?
+	 */
+	if (is_done) {
+		/* it care below call in
+		   "function mode" */
+		if (usbhsg_is_dcp(uep))
+			usbhs_dcp_control_transfer_done(pipe);
+
+		usbhsg_queue_pop(uep, ureq, 0);
+	}
+
+	return 0;
+}
+
+static int usbhsg_prepare_send_packet(struct usbhsg_uep *uep,
+				      struct usbhsg_request *ureq)
+{
+	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
+
+	/*
+	 *********  assume under spin lock  *********
+	 */
+
+	usbhs_fifo_prepare_write(pipe);
+	usbhsg_try_run_send_packet(uep, ureq);
+
+	return 0;
+}
+
+static int usbhsg_try_run_receive_packet(struct usbhsg_uep *uep,
+					 struct usbhsg_request *ureq)
+{
+	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
+	struct usb_request *req = &ureq->req;
+	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
+	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
+	void *buf;
+	int maxp;
+	int remainder, recv;
+	int is_done = 0;
+
+	/*
+	 *********  assume under spin lock  *********
+	 */
+
+	maxp		= usbhs_pipe_get_maxpacket(pipe);
+	buf		= req->buf    + req->actual;
+	remainder	= req->length - req->actual;
+
+	recv = usbhs_fifo_read(pipe, buf, remainder);
+	/*
+	 * recv < 0  : pipe busy
+	 * recv >= 0 : receive data
+	 *
+	 * recv <= max_packet
+	 */
+	if (recv < 0)
+		return -EBUSY;
+
+	/* update parameters */
+	req->actual += recv;
+
+	if ((recv == remainder) ||	/* receive all data */
+	    (recv < maxp))		/* short packet */
+		is_done = 1;
+
+	dev_dbg(dev, "  recv %d (%d/ %d/ %d/ %d)\n",
+		usbhs_pipe_number(pipe),
+		remainder, recv, is_done, req->zero);
+
+	/* read all data ? */
+	if (is_done) {
+		int disable = 0;
+
+		uep->handler->irq_mask(uep, disable);
+		usbhs_fifo_disable(pipe);
+		usbhsg_queue_pop(uep, ureq, 0);
+	}
+
+	return 0;
+}
+
+static int usbhsg_prepare_receive_packet(struct usbhsg_uep *uep,
+					 struct usbhsg_request *ureq)
+{
+	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
+	int enable = 1;
+	int ret;
+
+	/*
+	 *********  assume under spin lock  *********
+	 */
+
+	ret = usbhs_fifo_prepare_read(pipe);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * data will be read in interrupt handler
+	 */
+	uep->handler->irq_mask(uep, enable);
+
+	return ret;
+}
+
+static struct usbhsg_pipe_handle usbhsg_handler_send_by_empty = {
+	.prepare	= usbhsg_prepare_send_packet,
+	.try_run	= usbhsg_try_run_send_packet,
+	.irq_mask	= usbhsg_irq_empty_ctrl,
+};
+
+static struct usbhsg_pipe_handle usbhsg_handler_send_by_ready = {
+	.prepare	= usbhsg_prepare_send_packet,
+	.try_run	= usbhsg_try_run_send_packet,
+	.irq_mask	= usbhsg_irq_ready_ctrl,
+};
+
+static struct usbhsg_pipe_handle usbhsg_handler_recv_by_ready = {
+	.prepare	= usbhsg_prepare_receive_packet,
+	.try_run	= usbhsg_try_run_receive_packet,
+	.irq_mask	= usbhsg_irq_ready_ctrl,
+};
+
+static struct usbhsg_pipe_handle usbhsg_handler_ctrl_stage_end = {
+	.prepare	= usbhsg_try_run_ctrl_stage_end,
+	.try_run	= usbhsg_try_run_ctrl_stage_end,
+};
+
+/*
+ * DCP pipe can NOT use "ready interrupt" for "send"
+ * it should use "empty" interrupt.
+ * see
+ *   "Operation" - "Interrupt Function" - "BRDY Interrupt"
+ *
+ * on the other hand, normal pipe can use "ready interrupt" for "send"
+ * even though it is single/double buffer
+ */
+#define usbhsg_handler_send_ctrl	usbhsg_handler_send_by_empty
+#define usbhsg_handler_recv_ctrl	usbhsg_handler_recv_by_ready
+
+#define usbhsg_handler_send_packet	usbhsg_handler_send_by_ready
+#define usbhsg_handler_recv_packet	usbhsg_handler_recv_by_ready
+
+/*
+ *		USB_TYPE_STANDARD / clear feature functions
+ */
+static int usbhsg_recip_handler_std_control_done(struct usbhs_priv *priv,
+						 struct usbhsg_uep *uep,
+						 struct usb_ctrlrequest *ctrl)
+{
+	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
+	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
+	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
+
+	usbhs_dcp_control_transfer_done(pipe);
+
+	return 0;
+}
+
+static int usbhsg_recip_handler_std_clear_endpoint(struct usbhs_priv *priv,
+						   struct usbhsg_uep *uep,
+						   struct usb_ctrlrequest *ctrl)
+{
+	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
+	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
+
+	if (!usbhsg_status_has(gpriv, USBHSG_STATUS_WEDGE)) {
+		usbhs_fifo_disable(pipe);
+		usbhs_pipe_clear_sequence(pipe);
+		usbhs_fifo_enable(pipe);
+	}
+
+	usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
+
+	usbhsg_queue_prepare(uep);
+
+	return 0;
+}
+
+struct usbhsg_recip_handle req_clear_feature = {
+	.name		= "clear feature",
+	.device		= usbhsg_recip_handler_std_control_done,
+	.interface	= usbhsg_recip_handler_std_control_done,
+	.endpoint	= usbhsg_recip_handler_std_clear_endpoint,
+};
+
+/*
+ *		USB_TYPE handler
+ */
+static int usbhsg_recip_run_handle(struct usbhs_priv *priv,
+				   struct usbhsg_recip_handle *handler,
+				   struct usb_ctrlrequest *ctrl)
+{
+	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
+	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
+	struct usbhsg_uep *uep;
+	int recip = ctrl->bRequestType & USB_RECIP_MASK;
+	int nth = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
+	int ret;
+	int (*func)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
+		    struct usb_ctrlrequest *ctrl);
+	char *msg;
+
+	uep = usbhsg_gpriv_to_nth_uep(gpriv, nth);
+
+	switch (recip) {
+	case USB_RECIP_DEVICE:
+		msg	= "DEVICE";
+		func	= handler->device;
+		break;
+	case USB_RECIP_INTERFACE:
+		msg	= "INTERFACE";
+		func	= handler->interface;
+		break;
+	case USB_RECIP_ENDPOINT:
+		msg	= "ENDPOINT";
+		func	= handler->endpoint;
+		break;
+	default:
+		dev_warn(dev, "unsupported RECIP(%d)\n", recip);
+		func = NULL;
+		ret = -EINVAL;
+	}
+
+	if (func) {
+		dev_dbg(dev, "%s (pipe %d :%s)\n", handler->name, nth, msg);
+		ret = func(priv, uep, ctrl);
+	}
+
+	return ret;
+}
+
+/*
+ *		irq functions
+ *
+ * it will be called from usbhs_interrupt
+ */
+static int usbhsg_irq_dev_state(struct usbhs_priv *priv,
+				struct usbhs_irq_state *irq_state)
+{
+	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
+	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
+
+	gpriv->gadget.speed = usbhs_status_get_usb_speed(irq_state);
+
+	dev_dbg(dev, "state = %x : speed : %d\n",
+		usbhs_status_get_device_state(irq_state),
+		gpriv->gadget.speed);
+
+	return 0;
+}
+
+static int usbhsg_irq_ctrl_stage(struct usbhs_priv *priv,
+				 struct usbhs_irq_state *irq_state)
+{
+	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
+	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
+	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
+	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
+	struct usb_ctrlrequest ctrl;
+	struct usbhsg_recip_handle *recip_handler = NULL;
+	int stage = usbhs_status_get_ctrl_stage(irq_state);
+	int ret = 0;
+
+	dev_dbg(dev, "stage = %d\n", stage);
+
+	/*
+	 * see Manual
+	 *
+	 *  "Operation"
+	 *  - "Interrupt Function"
+	 *    - "Control Transfer Stage Transition Interrupt"
+	 *      - Fig. "Control Transfer Stage Transitions"
+	 */
+
+	switch (stage) {
+	case READ_DATA_STAGE:
+		dcp->handler = &usbhsg_handler_send_ctrl;
+		break;
+	case WRITE_DATA_STAGE:
+		dcp->handler = &usbhsg_handler_recv_ctrl;
+		break;
+	case NODATA_STATUS_STAGE:
+		dcp->handler = &usbhsg_handler_ctrl_stage_end;
+		break;
+	default:
+		return ret;
+	}
+
+	/*
+	 * get usb request
+	 */
+	usbhs_usbreq_get_val(priv, &ctrl);
+
+	switch (ctrl.bRequestType & USB_TYPE_MASK) {
+	case USB_TYPE_STANDARD:
+		switch (ctrl.bRequest) {
+		case USB_REQ_CLEAR_FEATURE:
+			recip_handler = &req_clear_feature;
+			break;
+		}
+	}
+
+	/*
+	 * setup stage / run recip
+	 */
+	if (recip_handler)
+		ret = usbhsg_recip_run_handle(priv, recip_handler, &ctrl);
+	else
+		ret = gpriv->driver->setup(&gpriv->gadget, &ctrl);
+
+	if (ret < 0)
+		usbhs_fifo_stall(pipe);
+
+	return ret;
+}
+
+static int usbhsg_irq_empty(struct usbhs_priv *priv,
+			    struct usbhs_irq_state *irq_state)
+{
+	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
+	struct usbhsg_uep *uep;
+	struct usbhs_pipe *pipe;
+	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
+	int i, ret;
+
+	if (!irq_state->bempsts) {
+		dev_err(dev, "debug %s !!\n", __func__);
+		return -EIO;
+	}
+
+	dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
+
+	/*
+	 * search interrupted "pipe"
+	 * not "uep".
+	 */
+	usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
+		if (!(irq_state->bempsts & (1 << i)))
+			continue;
+
+		uep	= usbhsg_pipe_to_uep(pipe);
+		ret	= usbhsg_queue_handle(uep);
+		if (ret < 0)
+			dev_err(dev, "send error %d : %d\n", i, ret);
+	}
+
+	return 0;
+}
+
+static int usbhsg_irq_ready(struct usbhs_priv *priv,
+			    struct usbhs_irq_state *irq_state)
+{
+	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
+	struct usbhsg_uep *uep;
+	struct usbhs_pipe *pipe;
+	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
+	int i, ret;
+
+	if (!irq_state->brdysts) {
+		dev_err(dev, "debug %s !!\n", __func__);
+		return -EIO;
+	}
+
+	dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
+
+	/*
+	 * search interrupted "pipe"
+	 * not "uep".
+	 */
+	usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
+		if (!(irq_state->brdysts & (1 << i)))
+			continue;
+
+		uep	= usbhsg_pipe_to_uep(pipe);
+		ret	= usbhsg_queue_handle(uep);
+		if (ret < 0)
+			dev_err(dev, "receive error %d : %d\n", i, ret);
+	}
+
+	return 0;
+}
+
+/*
+ *
+ *		usb_dcp_ops
+ *
+ */
+static int usbhsg_dcp_enable(struct usbhsg_uep *uep)
+{
+	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
+	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
+	struct usbhs_pipe *pipe;
+
+	/*
+	 *********  assume under spin lock  *********
+	 */
+
+	pipe = usbhs_dcp_malloc(priv);
+	if (!pipe)
+		return -EIO;
+
+	uep->pipe		= pipe;
+	uep->pipe->mod_private	= uep;
+	INIT_LIST_HEAD(&uep->list);
+
+	return 0;
+}
+
+#define usbhsg_dcp_disable usbhsg_pipe_disable
+static int usbhsg_pipe_disable(struct usbhsg_uep *uep)
+{
+	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
+	struct usbhsg_request *ureq;
+	int disable = 0;
+
+	/*
+	 *********  assume under spin lock  *********
+	 */
+
+	usbhs_fifo_disable(pipe);
+
+	/*
+	 * disable pipe irq
+	 */
+	usbhsg_irq_empty_ctrl(uep, disable);
+	usbhsg_irq_ready_ctrl(uep, disable);
+
+	while (1) {
+		ureq = usbhsg_queue_get(uep);
+		if (!ureq)
+			break;
+
+		usbhsg_queue_pop(uep, ureq, -ECONNRESET);
+	}
+
+	uep->pipe->mod_private	= NULL;
+	uep->pipe		= NULL;
+
+	return 0;
+}
+
+/*
+ *
+ *		usb_ep_ops
+ *
+ */
+static int usbhsg_ep_enable(struct usb_ep *ep,
+			 const struct usb_endpoint_descriptor *desc)
+{
+	struct usbhsg_uep *uep   = usbhsg_ep_to_uep(ep);
+	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
+	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
+	struct usbhs_pipe *pipe;
+	spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv);
+	unsigned long flags;
+	int ret = -EIO;
+
+	/********************  spin lock ********************/
+	spin_lock_irqsave(lock, flags);
+
+	pipe = usbhs_pipe_malloc(priv, desc);
+	if (pipe) {
+		uep->pipe		= pipe;
+		pipe->mod_private	= uep;
+		INIT_LIST_HEAD(&uep->list);
+
+		if (usb_endpoint_dir_in(desc))
+			uep->handler = &usbhsg_handler_send_packet;
+		else
+			uep->handler = &usbhsg_handler_recv_packet;
+
+		ret = 0;
+	}
+	spin_unlock_irqrestore(lock, flags);
+	/********************  spin unlock ******************/
+
+	return ret;
+}
+
+static int usbhsg_ep_disable(struct usb_ep *ep)
+{
+	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
+	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
+	spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv);
+	unsigned long flags;
+	int ret;
+
+	/********************  spin lock ********************/
+	spin_lock_irqsave(lock, flags);
+	ret = usbhsg_pipe_disable(uep);
+	spin_unlock_irqrestore(lock, flags);
+	/********************  spin unlock ******************/
+
+	return ret;
+}
+
+static struct usb_request *usbhsg_ep_alloc_request(struct usb_ep *ep,
+						   gfp_t gfp_flags)
+{
+	struct usbhsg_request *ureq;
+
+	ureq = kzalloc(sizeof *ureq, gfp_flags);
+	if (!ureq)
+		return NULL;
+
+	INIT_LIST_HEAD(&ureq->node);
+	return &ureq->req;
+}
+
+static void usbhsg_ep_free_request(struct usb_ep *ep,
+				   struct usb_request *req)
+{
+	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
+
+	WARN_ON(!list_empty(&ureq->node));
+	kfree(ureq);
+}
+
+static int usbhsg_ep_queue(struct usb_ep *ep, struct usb_request *req,
+			  gfp_t gfp_flags)
+{
+	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
+	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
+	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
+	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
+	spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv);
+	unsigned long flags;
+	int ret = 0;
+	int is_locked;
+
+	/*
+	 * CAUTION [*endpoint queue*]
+	 *
+	 * This function will be called from usb_request :: complete
+	 * or usb driver timing.
+	 * If this function is called from usb_request :: complete,
+	 * it is already under spinlock on this driver.
+	 * but it is called frm usb driver, this function should call spinlock.
+	 *
+	 * This function is using spin_trylock_irqsave to solve this issue.
+	 * if "is_locked" is 1, this mean this function lock it.
+	 * but if it is 0, this mean it is already under spin lock.
+	 * see also
+	 *   CAUTION [*queue handler*]
+	 *   CAUTION [*request complete*]
+	 */
+
+	/********************  spin lock ********************/
+	is_locked = spin_trylock_irqsave(lock, flags);
+
+	/* param check */
+	if (usbhsg_is_not_connected(gpriv)	||
+	    unlikely(!gpriv->driver)		||
+	    unlikely(!pipe))
+		ret = -ESHUTDOWN;
+	else
+		usbhsg_queue_push(uep, ureq);
+
+	if (is_locked)
+		spin_unlock_irqrestore(lock, flags);
+	/********************  spin unlock ******************/
+
+	usbhsg_queue_prepare(uep);
+
+	return ret;
+}
+
+static int usbhsg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
+{
+	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
+	struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
+	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
+	spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv);
+	unsigned long flags;
+	int is_locked;
+
+	/*
+	 * see
+	 *   CAUTION [*queue handler*]
+	 *   CAUTION [*endpoint queue*]
+	 *   CAUTION [*request complete*]
+	 */
+
+	/********************  spin lock ********************/
+	is_locked = spin_trylock_irqsave(lock, flags);
+
+	usbhsg_queue_pop(uep, ureq, -ECONNRESET);
+
+	if (is_locked)
+		spin_unlock_irqrestore(lock, flags);
+	/********************  spin unlock ******************/
+
+	return 0;
+}
+
+static int __usbhsg_ep_set_halt_wedge(struct usb_ep *ep, int halt, int wedge)
+{
+	struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
+	struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
+	struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
+	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
+	spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv);
+	unsigned long flags;
+	int ret = -EAGAIN;
+	int is_locked;
+
+	/*
+	 * see
+	 *   CAUTION [*queue handler*]
+	 *   CAUTION [*endpoint queue*]
+	 *   CAUTION [*request complete*]
+	 */
+
+	/********************  spin lock ********************/
+	is_locked = spin_trylock_irqsave(lock, flags);
+	if (!usbhsg_queue_get(uep)) {
+
+		dev_dbg(dev, "set halt %d (pipe %d)\n",
+			halt, usbhs_pipe_number(pipe));
+
+		if (halt)
+			usbhs_fifo_stall(pipe);
+		else
+			usbhs_fifo_disable(pipe);
+
+		if (halt && wedge)
+			usbhsg_status_set(gpriv, USBHSG_STATUS_WEDGE);
+		else
+			usbhsg_status_clr(gpriv, USBHSG_STATUS_WEDGE);
+
+		ret = 0;
+	}
+
+	if (is_locked)
+		spin_unlock_irqrestore(lock, flags);
+	/********************  spin unlock ******************/
+
+	return ret;
+}
+
+static int usbhsg_ep_set_halt(struct usb_ep *ep, int value)
+{
+	return __usbhsg_ep_set_halt_wedge(ep, value, 0);
+}
+
+static int usbhsg_ep_set_wedge(struct usb_ep *ep)
+{
+	return __usbhsg_ep_set_halt_wedge(ep, 1, 1);
+}
+
+static struct usb_ep_ops usbhsg_ep_ops = {
+	.enable		= usbhsg_ep_enable,
+	.disable	= usbhsg_ep_disable,
+
+	.alloc_request	= usbhsg_ep_alloc_request,
+	.free_request	= usbhsg_ep_free_request,
+
+	.queue		= usbhsg_ep_queue,
+	.dequeue	= usbhsg_ep_dequeue,
+
+	.set_halt	= usbhsg_ep_set_halt,
+	.set_wedge	= usbhsg_ep_set_wedge,
+};
+
+/*
+ *		usb module start/end
+ */
+static int usbhsg_try_start(struct usbhs_priv *priv, u32 status)
+{
+	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
+	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
+	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
+	struct device *dev = usbhs_priv_to_dev(priv);
+	spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv);
+	unsigned long flags;
+
+	/********************  spin lock ********************/
+	spin_lock_irqsave(lock, flags);
+
+	/*
+	 * enable interrupt and systems if ready
+	 */
+	usbhsg_status_set(gpriv, status);
+	if (!(usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
+	      usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD)))
+		goto usbhsg_try_start_unlock;
+
+	dev_dbg(dev, "start gadget\n");
+
+	/*
+	 * pipe initialize and enable DCP
+	 */
+	usbhs_pipe_init(priv);
+	usbhsg_dcp_enable(dcp);
+
+	/*
+	 * system config enble
+	 * - HI speed
+	 * - function
+	 * - usb module
+	 */
+	usbhs_sys_hispeed_ctrl(priv, 1);
+	usbhs_sys_function_ctrl(priv, 1);
+	usbhs_sys_usb_ctrl(priv, 1);
+
+	/*
+	 * enable irq callback
+	 */
+	mod->irq_dev_state	= usbhsg_irq_dev_state;
+	mod->irq_ctrl_stage	= usbhsg_irq_ctrl_stage;
+	mod->irq_empty		= usbhsg_irq_empty;
+	mod->irq_ready		= usbhsg_irq_ready;
+	mod->irq_bempsts	= 0;
+	mod->irq_brdysts	= 0;
+	usbhs_irq_callback_update(priv, mod);
+
+usbhsg_try_start_unlock:
+	spin_unlock_irqrestore(lock, flags);
+	/********************  spin unlock ********************/
+
+	return 0;
+}
+
+static int usbhsg_try_stop(struct usbhs_priv *priv, u32 status)
+{
+	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
+	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
+	struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
+	struct device *dev = usbhs_priv_to_dev(priv);
+	spinlock_t *lock = usbhsg_gpriv_to_lock(gpriv);
+	unsigned long flags;
+
+	/********************  spin lock ********************/
+	spin_lock_irqsave(lock, flags);
+
+	/*
+	 * disable interrupt and systems if 1st try
+	 */
+	usbhsg_status_clr(gpriv, status);
+	if (!usbhsg_status_has(gpriv, USBHSG_STATUS_STARTED) &&
+	    !usbhsg_status_has(gpriv, USBHSG_STATUS_REGISTERD))
+		goto usbhsg_try_stop_unlock;
+
+	/* disable all irq */
+	mod->irq_dev_state	= NULL;
+	mod->irq_ctrl_stage	= NULL;
+	mod->irq_empty		= NULL;
+	mod->irq_ready		= NULL;
+	mod->irq_bempsts	= 0;
+	mod->irq_brdysts	= 0;
+	usbhs_irq_callback_update(priv, mod);
+
+	usbhsg_dcp_disable(dcp);
+
+	gpriv->gadget.speed = USB_SPEED_UNKNOWN;
+
+	/* disable sys */
+	usbhs_sys_hispeed_ctrl(priv, 0);
+	usbhs_sys_function_ctrl(priv, 0);
+	usbhs_sys_usb_ctrl(priv, 0);
+
+	spin_unlock_irqrestore(lock, flags);
+	/********************  spin unlock ********************/
+
+	if (gpriv->driver &&
+	    gpriv->driver->disconnect)
+		gpriv->driver->disconnect(&gpriv->gadget);
+
+	dev_dbg(dev, "stop gadget\n");
+
+	return 0;
+
+usbhsg_try_stop_unlock:
+	spin_unlock_irqrestore(lock, flags);
+
+	return 0;
+}
+
+/*
+ *
+ *		linux usb function
+ *
+ */
+struct usbhsg_gpriv *the_controller;
+int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
+			    int (*bind)(struct usb_gadget *))
+{
+	struct usbhsg_gpriv *gpriv = the_controller;
+	struct usbhs_priv *priv;
+	struct device *dev;
+	int ret;
+
+	if (!bind		||
+	    !driver		||
+	    !driver->setup	||
+	    driver->speed != USB_SPEED_HIGH)
+		return -EINVAL;
+	if (!gpriv)
+		return -ENODEV;
+	if (gpriv->driver)
+		return -EBUSY;
+
+	dev  = usbhsg_gpriv_to_dev(gpriv);
+	priv = usbhsg_gpriv_to_priv(gpriv);
+
+	/* first hook up the driver ... */
+	gpriv->driver = driver;
+	gpriv->gadget.dev.driver = &driver->driver;
+
+	ret = device_add(&gpriv->gadget.dev);
+	if (ret) {
+		dev_err(dev, "device_add error %d\n", ret);
+		goto add_fail;
+	}
+
+	ret = bind(&gpriv->gadget);
+	if (ret) {
+		dev_err(dev, "bind to driver %s error %d\n",
+			driver->driver.name, ret);
+		goto bind_fail;
+	}
+
+	dev_dbg(dev, "bind %s\n", driver->driver.name);
+
+	return usbhsg_try_start(priv, USBHSG_STATUS_REGISTERD);
+
+bind_fail:
+	device_del(&gpriv->gadget.dev);
+add_fail:
+	gpriv->driver = NULL;
+	gpriv->gadget.dev.driver = NULL;
+
+	return ret;
+}
+EXPORT_SYMBOL(usb_gadget_probe_driver);
+
+int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
+{
+	struct usbhsg_gpriv *gpriv = the_controller;
+	struct usbhs_priv *priv;
+	struct device *dev = usbhsg_gpriv_to_dev(gpriv);
+
+	if (!gpriv)
+		return -ENODEV;
+
+	if (!driver		||
+	    !driver->unbind	||
+	    driver != gpriv->driver)
+		return -EINVAL;
+
+	dev  = usbhsg_gpriv_to_dev(gpriv);
+	priv = usbhsg_gpriv_to_priv(gpriv);
+
+	usbhsg_try_stop(priv, USBHSG_STATUS_REGISTERD);
+	device_del(&gpriv->gadget.dev);
+	gpriv->driver = NULL;
+
+	if (driver->disconnect)
+		driver->disconnect(&gpriv->gadget);
+
+	driver->unbind(&gpriv->gadget);
+	dev_dbg(dev, "unbind %s\n", driver->driver.name);
+
+	return 0;
+}
+EXPORT_SYMBOL(usb_gadget_unregister_driver);
+
+/*
+ *		usb gadget ops
+ */
+static int usbhsg_get_frame(struct usb_gadget *gadget)
+{
+	struct usbhsg_gpriv *gpriv = usbhsg_gadget_to_gpriv(gadget);
+	struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
+
+	return usbhs_frame_get_num(priv);
+}
+
+static struct usb_gadget_ops usbhsg_gadget_ops = {
+	.get_frame		= usbhsg_get_frame,
+};
+
+static int usbhsg_start(struct usbhs_priv *priv)
+{
+	return usbhsg_try_start(priv, USBHSG_STATUS_STARTED);
+}
+
+static int usbhsg_stop(struct usbhs_priv *priv)
+{
+	return usbhsg_try_stop(priv, USBHSG_STATUS_STARTED);
+}
+
+int __devinit usbhs_mod_gadget_probe(struct usbhs_priv *priv)
+{
+	struct usbhsg_gpriv *gpriv;
+	struct usbhsg_uep *uep;
+	struct device *dev = usbhs_priv_to_dev(priv);
+	int pipe_size = usbhs_get_dparam(priv, pipe_size);
+	int i;
+
+	gpriv = kzalloc(sizeof(struct usbhsg_gpriv), GFP_KERNEL);
+	if (!gpriv) {
+		dev_err(dev, "Could not allocate gadget priv\n");
+		return -ENOMEM;
+	}
+
+	uep = kzalloc(sizeof(struct usbhsg_uep) * pipe_size, GFP_KERNEL);
+	if (!uep) {
+		dev_err(dev, "Could not allocate ep\n");
+		goto usbhs_mod_gadget_probe_err_gpriv;
+	}
+
+	/*
+	 * CAUTION
+	 *
+	 * There is no guarantee that it is possible to access usb module here.
+	 * Don't accesses to it.
+	 * The accesse will be enable after "usbhsg_start"
+	 */
+
+	/*
+	 * register itself
+	 */
+	usbhs_mod_register(priv, &gpriv->mod, USBHS_GADGET);
+
+	/* init gpriv */
+	gpriv->mod.name		= "gadget";
+	gpriv->mod.start	= usbhsg_start;
+	gpriv->mod.stop		= usbhsg_stop;
+	gpriv->uep		= uep;
+	gpriv->uep_size		= pipe_size;
+	usbhsg_status_init(gpriv);
+
+	/*
+	 * init gadget
+	 */
+	device_initialize(&gpriv->gadget.dev);
+	dev_set_name(&gpriv->gadget.dev, "gadget");
+	gpriv->gadget.dev.parent	= dev;
+	gpriv->gadget.name		= "renesas_usbhs_udc";
+	gpriv->gadget.ops		= &usbhsg_gadget_ops;
+	gpriv->gadget.is_dualspeed	= 1;
+
+	INIT_LIST_HEAD(&gpriv->gadget.ep_list);
+
+	/*
+	 * init usb_ep
+	 */
+	usbhsg_for_each_uep_with_dcp(uep, gpriv, i) {
+		uep->gpriv	= gpriv;
+		snprintf(uep->ep_name, EP_NAME_SIZE, "ep%d", i);
+
+		uep->ep.name		= uep->ep_name;
+		uep->ep.ops		= &usbhsg_ep_ops;
+		INIT_LIST_HEAD(&uep->ep.ep_list);
+		INIT_LIST_HEAD(&uep->list);
+
+		/* init DCP */
+		if (usbhsg_is_dcp(uep)) {
+			gpriv->gadget.ep0 = &uep->ep;
+			uep->ep.maxpacket = 64;
+		}
+		/* init normal pipe */
+		else {
+			uep->ep.maxpacket = 512;
+			list_add_tail(&uep->ep.ep_list, &gpriv->gadget.ep_list);
+		}
+	}
+
+	the_controller = gpriv;
+
+	dev_info(dev, "gadget probed\n");
+
+	return 0;
+
+usbhs_mod_gadget_probe_err_gpriv:
+	kfree(gpriv);
+
+	return -ENOMEM;
+}
+
+void __devexit usbhs_mod_gadget_remove(struct usbhs_priv *priv)
+{
+	struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
+
+	kfree(gpriv);
+}