text: /*
   * udc.c - ChipIdea UDC driver
   *
   * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
   *
   * Author: David Lopo
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #include <linux/delay.h>
  #include <linux/device.h>
  #include <linux/dmapool.h>
  #include <linux/err.h>
  #include <linux/irqreturn.h>
  #include <linux/kernel.h>
  #include <linux/slab.h>
  #include <linux/pm_runtime.h>
  #include <linux/usb/ch9.h>
  #include <linux/usb/gadget.h>
  #include <linux/usb/otg-fsm.h>
  #include <linux/usb/chipidea.h>
  
  #include "ci.h"
  #include "udc.h"
  #include "bits.h"
  #include "otg.h"
  #include "otg_fsm.h"
  
  /* control endpoint description */
  static const struct usb_endpoint_descriptor
  ctrl_endpt_out_desc = {
  	.bLength         = USB_DT_ENDPOINT_SIZE,
  	.bDescriptorType = USB_DT_ENDPOINT,
  
  	.bEndpointAddress = USB_DIR_OUT,
  	.bmAttributes    = USB_ENDPOINT_XFER_CONTROL,
  	.wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),
  };
  
  static const struct usb_endpoint_descriptor
  ctrl_endpt_in_desc = {
  	.bLength         = USB_DT_ENDPOINT_SIZE,
  	.bDescriptorType = USB_DT_ENDPOINT,
  
  	.bEndpointAddress = USB_DIR_IN,
  	.bmAttributes    = USB_ENDPOINT_XFER_CONTROL,
  	.wMaxPacketSize  = cpu_to_le16(CTRL_PAYLOAD_MAX),
  };
  
  /**
   * hw_ep_bit: calculates the bit number
   * @num: endpoint number
   * @dir: endpoint direction
   *
   * This function returns bit number
   */
  static inline int hw_ep_bit(int num, int dir)
  {
  	return num + (dir ? 16 : 0);
  }
  
  static inline int ep_to_bit(struct ci_hdrc *ci, int n)
  {
  	int fill = 16 - ci->hw_ep_max / 2;
  
  	if (n >= ci->hw_ep_max / 2)
  		n += fill;
  
  	return n;
  }
  
  /**
   * hw_device_state: enables/disables interrupts (execute without interruption)
   * @dma: 0 => disable, !0 => enable and set dma engine
   *
   * This function returns an error code
   */
  static int hw_device_state(struct ci_hdrc *ci, u32 dma)
  {
  	if (dma) {
  		hw_write(ci, OP_ENDPTLISTADDR, ~0, dma);
  		/* interrupt, error, port change, reset, sleep/suspend */
  		hw_write(ci, OP_USBINTR, ~0,
  			     USBi_UI|USBi_UEI|USBi_PCI|USBi_URI|USBi_SLI);
  	} else {
  		hw_write(ci, OP_USBINTR, ~0, 0);
  	}
  	return 0;
  }
  
  /**
   * hw_ep_flush: flush endpoint fifo (execute without interruption)
   * @num: endpoint number
   * @dir: endpoint direction
   *
   * This function returns an error code
   */
  static int hw_ep_flush(struct ci_hdrc *ci, int num, int dir)
  {
  	int n = hw_ep_bit(num, dir);
  
  	do {
  		/* flush any pending transfer */
  		hw_write(ci, OP_ENDPTFLUSH, ~0, BIT(n));
  		while (hw_read(ci, OP_ENDPTFLUSH, BIT(n)))
  			cpu_relax();
  	} while (hw_read(ci, OP_ENDPTSTAT, BIT(n)));
  
  	return 0;
  }
  
  /**
   * hw_ep_disable: disables endpoint (execute without interruption)
   * @num: endpoint number
   * @dir: endpoint direction
   *
   * This function returns an error code
   */
  static int hw_ep_disable(struct ci_hdrc *ci, int num, int dir)
  {
  	hw_ep_flush(ci, num, dir);
  	hw_write(ci, OP_ENDPTCTRL + num,
  		 dir ? ENDPTCTRL_TXE : ENDPTCTRL_RXE, 0);
  	return 0;
  }
  
  /**
   * hw_ep_enable: enables endpoint (execute without interruption)
   * @num:  endpoint number
   * @dir:  endpoint direction
   * @type: endpoint type
   *
   * This function returns an error code
   */
  static int hw_ep_enable(struct ci_hdrc *ci, int num, int dir, int type)
  {
  	u32 mask, data;
  
  	if (dir) {
  		mask  = ENDPTCTRL_TXT;  /* type    */
  		data  = type << __ffs(mask);
  
  		mask |= ENDPTCTRL_TXS;  /* unstall */
  		mask |= ENDPTCTRL_TXR;  /* reset data toggle */
  		data |= ENDPTCTRL_TXR;
  		mask |= ENDPTCTRL_TXE;  /* enable  */
  		data |= ENDPTCTRL_TXE;
  	} else {
  		mask  = ENDPTCTRL_RXT;  /* type    */
  		data  = type << __ffs(mask);
  
  		mask |= ENDPTCTRL_RXS;  /* unstall */
  		mask |= ENDPTCTRL_RXR;  /* reset data toggle */
  		data |= ENDPTCTRL_RXR;
  		mask |= ENDPTCTRL_RXE;  /* enable  */
  		data |= ENDPTCTRL_RXE;
  	}
  	hw_write(ci, OP_ENDPTCTRL + num, mask, data);
  	return 0;
  }
  
  /**
   * hw_ep_get_halt: return endpoint halt status
   * @num: endpoint number
   * @dir: endpoint direction
   *
   * This function returns 1 if endpoint halted
   */
  static int hw_ep_get_halt(struct ci_hdrc *ci, int num, int dir)
  {
  	u32 mask = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
  
  	return hw_read(ci, OP_ENDPTCTRL + num, mask) ? 1 : 0;
  }
  
  /**
   * hw_ep_prime: primes endpoint (execute without interruption)
   * @num:     endpoint number
   * @dir:     endpoint direction
   * @is_ctrl: true if control endpoint
   *
   * This function returns an error code
   */
  static int hw_ep_prime(struct ci_hdrc *ci, int num, int dir, int is_ctrl)
  {
  	int n = hw_ep_bit(num, dir);
  
  	if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
  		return -EAGAIN;
  
  	hw_write(ci, OP_ENDPTPRIME, ~0, BIT(n));
  
  	while (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
  		cpu_relax();
  	if (is_ctrl && dir == RX && hw_read(ci, OP_ENDPTSETUPSTAT, BIT(num)))
  		return -EAGAIN;
  
  	/* status shoult be tested according with manual but it doesn't work */
  	return 0;
  }
  
  /**
   * hw_ep_set_halt: configures ep halt & resets data toggle after clear (execute
   *                 without interruption)
   * @num:   endpoint number
   * @dir:   endpoint direction
   * @value: true => stall, false => unstall
   *
   * This function returns an error code
   */
  static int hw_ep_set_halt(struct ci_hdrc *ci, int num, int dir, int value)
  {
  	if (value != 0 && value != 1)
  		return -EINVAL;
  
  	do {
  		enum ci_hw_regs reg = OP_ENDPTCTRL + num;
  		u32 mask_xs = dir ? ENDPTCTRL_TXS : ENDPTCTRL_RXS;
  		u32 mask_xr = dir ? ENDPTCTRL_TXR : ENDPTCTRL_RXR;
  
  		/* data toggle - reserved for EP0 but it's in ESS */
  		hw_write(ci, reg, mask_xs|mask_xr,
  			  value ? mask_xs : mask_xr);
  	} while (value != hw_ep_get_halt(ci, num, dir));
  
  	return 0;
  }
  
  /**
   * hw_is_port_high_speed: test if port is high speed
   *
   * This function returns true if high speed port
   */
  static int hw_port_is_high_speed(struct ci_hdrc *ci)
  {
  	return ci->hw_bank.lpm ? hw_read(ci, OP_DEVLC, DEVLC_PSPD) :
  		hw_read(ci, OP_PORTSC, PORTSC_HSP);
  }
  
  /**
   * hw_test_and_clear_complete: test & clear complete status (execute without
   *                             interruption)
   * @n: endpoint number
   *
   * This function returns complete status
   */
  static int hw_test_and_clear_complete(struct ci_hdrc *ci, int n)
  {
  	n = ep_to_bit(ci, n);
  	return hw_test_and_clear(ci, OP_ENDPTCOMPLETE, BIT(n));
  }
  
  /**
   * hw_test_and_clear_intr_active: test & clear active interrupts (execute
   *                                without interruption)
   *
   * This function returns active interrutps
   */
  static u32 hw_test_and_clear_intr_active(struct ci_hdrc *ci)
  {
  	u32 reg = hw_read_intr_status(ci) & hw_read_intr_enable(ci);
  
  	hw_write(ci, OP_USBSTS, ~0, reg);
  	return reg;
  }
  
  /**
   * hw_test_and_clear_setup_guard: test & clear setup guard (execute without
   *                                interruption)
   *
   * This function returns guard value
   */
  static int hw_test_and_clear_setup_guard(struct ci_hdrc *ci)
  {
  	return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, 0);
  }
  
  /**
   * hw_test_and_set_setup_guard: test & set setup guard (execute without
   *                              interruption)
   *
   * This function returns guard value
   */
  static int hw_test_and_set_setup_guard(struct ci_hdrc *ci)
  {
  	return hw_test_and_write(ci, OP_USBCMD, USBCMD_SUTW, USBCMD_SUTW);
  }
  
  /**
   * hw_usb_set_address: configures USB address (execute without interruption)
   * @value: new USB address
   *
   * This function explicitly sets the address, without the "USBADRA" (advance)
   * feature, which is not supported by older versions of the controller.
   */
  static void hw_usb_set_address(struct ci_hdrc *ci, u8 value)
  {
  	hw_write(ci, OP_DEVICEADDR, DEVICEADDR_USBADR,
  		 value << __ffs(DEVICEADDR_USBADR));
  }
  
  /**
   * hw_usb_reset: restart device after a bus reset (execute without
   *               interruption)
   *
   * This function returns an error code
   */
  static int hw_usb_reset(struct ci_hdrc *ci)
  {
  	hw_usb_set_address(ci, 0);
  
  	/* ESS flushes only at end?!? */
  	hw_write(ci, OP_ENDPTFLUSH,    ~0, ~0);
  
  	/* clear setup token semaphores */
  	hw_write(ci, OP_ENDPTSETUPSTAT, 0,  0);
  
  	/* clear complete status */
  	hw_write(ci, OP_ENDPTCOMPLETE,  0,  0);
  
  	/* wait until all bits cleared */
  	while (hw_read(ci, OP_ENDPTPRIME, ~0))
  		udelay(10);             /* not RTOS friendly */
  
  	/* reset all endpoints ? */
  
  	/* reset internal status and wait for further instructions
  	   no need to verify the port reset status (ESS does it) */
  
  	return 0;
  }
  
  /******************************************************************************
   * UTIL block
   *****************************************************************************/
  
  static int add_td_to_list(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq,
  			  unsigned length)
  {
  	int i;
  	u32 temp;
  	struct td_node *lastnode, *node = kzalloc(sizeof(struct td_node),
  						  GFP_ATOMIC);
  
  	if (node == NULL)
  		return -ENOMEM;
  
  	node->ptr = dma_pool_alloc(hwep->td_pool, GFP_ATOMIC,
  				   &node->dma);
  	if (node->ptr == NULL) {
  		kfree(node);
  		return -ENOMEM;
  	}
  
  	memset(node->ptr, 0, sizeof(struct ci_hw_td));
  	node->ptr->token = cpu_to_le32(length << __ffs(TD_TOTAL_BYTES));
  	node->ptr->token &= cpu_to_le32(TD_TOTAL_BYTES);
  	node->ptr->token |= cpu_to_le32(TD_STATUS_ACTIVE);
  	if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX) {
  		u32 mul = hwreq->req.length / hwep->ep.maxpacket;
  
  		if (hwreq->req.length == 0
  				|| hwreq->req.length % hwep->ep.maxpacket)
  			mul++;
  		node->ptr->token |= mul << __ffs(TD_MULTO);
  	}
  
  	temp = (u32) (hwreq->req.dma + hwreq->req.actual);
  	if (length) {
  		node->ptr->page[0] = cpu_to_le32(temp);
  		for (i = 1; i < TD_PAGE_COUNT; i++) {
  			u32 page = temp + i * CI_HDRC_PAGE_SIZE;
  			page &= ~TD_RESERVED_MASK;
  			node->ptr->page[i] = cpu_to_le32(page);
  		}
  	}
  
  	hwreq->req.actual += length;
  
  	if (!list_empty(&hwreq->tds)) {
  		/* get the last entry */
  		lastnode = list_entry(hwreq->tds.prev,
  				struct td_node, td);
  		lastnode->ptr->next = cpu_to_le32(node->dma);
  	}
  
  	INIT_LIST_HEAD(&node->td);
  	list_add_tail(&node->td, &hwreq->tds);
  
  	return 0;
  }
  
  /**
   * _usb_addr: calculates endpoint address from direction & number
   * @ep:  endpoint
   */
  static inline u8 _usb_addr(struct ci_hw_ep *ep)
  {
  	return ((ep->dir == TX) ? USB_ENDPOINT_DIR_MASK : 0) | ep->num;
  }
  
  /**
   * _hardware_enqueue: configures a request at hardware level
   * @hwep:   endpoint
   * @hwreq:  request
   *
   * This function returns an error code
   */
  static int _hardware_enqueue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
  {
  	struct ci_hdrc *ci = hwep->ci;
  	int ret = 0;
  	unsigned rest = hwreq->req.length;
  	int pages = TD_PAGE_COUNT;
  	struct td_node *firstnode, *lastnode;
  
  	/* don't queue twice */
  	if (hwreq->req.status == -EALREADY)
  		return -EALREADY;
  
  	hwreq->req.status = -EALREADY;
  
  	ret = usb_gadget_map_request(&ci->gadget, &hwreq->req, hwep->dir);
  	if (ret)
  		return ret;
  
  	/*
  	 * The first buffer could be not page aligned.
  	 * In that case we have to span into one extra td.
  	 */
  	if (hwreq->req.dma % PAGE_SIZE)
  		pages--;
  
  	if (rest == 0) {
  		ret = add_td_to_list(hwep, hwreq, 0);
  		if (ret < 0)
  			goto done;
  	}
  
  	while (rest > 0) {
  		unsigned count = min(hwreq->req.length - hwreq->req.actual,
  					(unsigned)(pages * CI_HDRC_PAGE_SIZE));
  		ret = add_td_to_list(hwep, hwreq, count);
  		if (ret < 0)
  			goto done;
  
  		rest -= count;
  	}
  
  	if (hwreq->req.zero && hwreq->req.length && hwep->dir == TX
  	    && (hwreq->req.length % hwep->ep.maxpacket == 0)) {
  		ret = add_td_to_list(hwep, hwreq, 0);
  		if (ret < 0)
  			goto done;
  	}
  
  	firstnode = list_first_entry(&hwreq->tds, struct td_node, td);
  
  	lastnode = list_entry(hwreq->tds.prev,
  		struct td_node, td);
  
  	lastnode->ptr->next = cpu_to_le32(TD_TERMINATE);
  	if (!hwreq->req.no_interrupt)
  		lastnode->ptr->token |= cpu_to_le32(TD_IOC);
  	wmb();
  
  	hwreq->req.actual = 0;
  	if (!list_empty(&hwep->qh.queue)) {
  		struct ci_hw_req *hwreqprev;
  		int n = hw_ep_bit(hwep->num, hwep->dir);
  		int tmp_stat;
  		struct td_node *prevlastnode;
  		u32 next = firstnode->dma & TD_ADDR_MASK;
  
  		hwreqprev = list_entry(hwep->qh.queue.prev,
  				struct ci_hw_req, queue);
  		prevlastnode = list_entry(hwreqprev->tds.prev,
  				struct td_node, td);
  
  		prevlastnode->ptr->next = cpu_to_le32(next);
  		wmb();
  		if (hw_read(ci, OP_ENDPTPRIME, BIT(n)))
  			goto done;
  		do {
  			hw_write(ci, OP_USBCMD, USBCMD_ATDTW, USBCMD_ATDTW);
  			tmp_stat = hw_read(ci, OP_ENDPTSTAT, BIT(n));
  		} while (!hw_read(ci, OP_USBCMD, USBCMD_ATDTW));
  		hw_write(ci, OP_USBCMD, USBCMD_ATDTW, 0);
  		if (tmp_stat)
  			goto done;
  	}
  
  	/*  QH configuration */
  	hwep->qh.ptr->td.next = cpu_to_le32(firstnode->dma);
  	hwep->qh.ptr->td.token &=
  		cpu_to_le32(~(TD_STATUS_HALTED|TD_STATUS_ACTIVE));
  
  	if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == RX) {
  		u32 mul = hwreq->req.length / hwep->ep.maxpacket;
  
  		if (hwreq->req.length == 0
  				|| hwreq->req.length % hwep->ep.maxpacket)
  			mul++;
  		hwep->qh.ptr->cap |= mul << __ffs(QH_MULT);
  	}
  
  	wmb();   /* synchronize before ep prime */
  
  	ret = hw_ep_prime(ci, hwep->num, hwep->dir,
  			   hwep->type == USB_ENDPOINT_XFER_CONTROL);
  done:
  	return ret;
  }
  
  /*
   * free_pending_td: remove a pending request for the endpoint
   * @hwep: endpoint
   */
  static void free_pending_td(struct ci_hw_ep *hwep)
  {
  	struct td_node *pending = hwep->pending_td;
  
  	dma_pool_free(hwep->td_pool, pending->ptr, pending->dma);
  	hwep->pending_td = NULL;
  	kfree(pending);
  }
  
  static int reprime_dtd(struct ci_hdrc *ci, struct ci_hw_ep *hwep,
  					   struct td_node *node)
  {
  	hwep->qh.ptr->td.next = node->dma;
  	hwep->qh.ptr->td.token &=
  		cpu_to_le32(~(TD_STATUS_HALTED | TD_STATUS_ACTIVE));
  
  	/* Synchronize before ep prime */
  	wmb();
  
  	return hw_ep_prime(ci, hwep->num, hwep->dir,
  				hwep->type == USB_ENDPOINT_XFER_CONTROL);
  }
  
  /**
   * _hardware_dequeue: handles a request at hardware level
   * @gadget: gadget
   * @hwep:   endpoint
   *
   * This function returns an error code
   */
  static int _hardware_dequeue(struct ci_hw_ep *hwep, struct ci_hw_req *hwreq)
  {
  	u32 tmptoken;
  	struct td_node *node, *tmpnode;
  	unsigned remaining_length;
  	unsigned actual = hwreq->req.length;
  	struct ci_hdrc *ci = hwep->ci;
  
  	if (hwreq->req.status != -EALREADY)
  		return -EINVAL;
  
  	hwreq->req.status = 0;
  
  	list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
  		tmptoken = le32_to_cpu(node->ptr->token);
  		if ((TD_STATUS_ACTIVE & tmptoken) != 0) {
  			int n = hw_ep_bit(hwep->num, hwep->dir);
  
  			if (ci->rev == CI_REVISION_24)
  				if (!hw_read(ci, OP_ENDPTSTAT, BIT(n)))
  					reprime_dtd(ci, hwep, node);
  			hwreq->req.status = -EALREADY;
  			return -EBUSY;
  		}
  
  		remaining_length = (tmptoken & TD_TOTAL_BYTES);
  		remaining_length >>= __ffs(TD_TOTAL_BYTES);
  		actual -= remaining_length;
  
  		hwreq->req.status = tmptoken & TD_STATUS;
  		if ((TD_STATUS_HALTED & hwreq->req.status)) {
  			hwreq->req.status = -EPIPE;
  			break;
  		} else if ((TD_STATUS_DT_ERR & hwreq->req.status)) {
  			hwreq->req.status = -EPROTO;
  			break;
  		} else if ((TD_STATUS_TR_ERR & hwreq->req.status)) {
  			hwreq->req.status = -EILSEQ;
  			break;
  		}
  
  		if (remaining_length) {
  			if (hwep->dir) {
  				hwreq->req.status = -EPROTO;
  				break;
  			}
  		}
  		/*
  		 * As the hardware could still address the freed td
  		 * which will run the udc unusable, the cleanup of the
  		 * td has to be delayed by one.
  		 */
  		if (hwep->pending_td)
  			free_pending_td(hwep);
  
  		hwep->pending_td = node;
  		list_del_init(&node->td);
  	}
  
  	usb_gadget_unmap_request(&hwep->ci->gadget, &hwreq->req, hwep->dir);
  
  	hwreq->req.actual += actual;
  
  	if (hwreq->req.status)
  		return hwreq->req.status;
  
  	return hwreq->req.actual;
  }
  
  /**
   * _ep_nuke: dequeues all endpoint requests
   * @hwep: endpoint
   *
   * This function returns an error code
   * Caller must hold lock
   */
  static int _ep_nuke(struct ci_hw_ep *hwep)
  __releases(hwep->lock)
  __acquires(hwep->lock)
  {
  	struct td_node *node, *tmpnode;
  	if (hwep == NULL)
  		return -EINVAL;
  
  	hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
  
  	while (!list_empty(&hwep->qh.queue)) {
  
  		/* pop oldest request */
  		struct ci_hw_req *hwreq = list_entry(hwep->qh.queue.next,
  						     struct ci_hw_req, queue);
  
  		list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
  			dma_pool_free(hwep->td_pool, node->ptr, node->dma);
  			list_del_init(&node->td);
  			node->ptr = NULL;
  			kfree(node);
  		}
  
  		list_del_init(&hwreq->queue);
  		hwreq->req.status = -ESHUTDOWN;
  
  		if (hwreq->req.complete != NULL) {
  			spin_unlock(hwep->lock);
  			usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
  			spin_lock(hwep->lock);
  		}
  	}
  
  	if (hwep->pending_td)
  		free_pending_td(hwep);
  
  	return 0;
  }
  
  static int _ep_set_halt(struct usb_ep *ep, int value, bool check_transfer)
  {
  	struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
  	int direction, retval = 0;
  	unsigned long flags;
  
  	if (ep == NULL || hwep->ep.desc == NULL)
  		return -EINVAL;
  
  	if (usb_endpoint_xfer_isoc(hwep->ep.desc))
  		return -EOPNOTSUPP;
  
  	spin_lock_irqsave(hwep->lock, flags);
  
  	if (value && hwep->dir == TX && check_transfer &&
  		!list_empty(&hwep->qh.queue) &&
  			!usb_endpoint_xfer_control(hwep->ep.desc)) {
  		spin_unlock_irqrestore(hwep->lock, flags);
  		return -EAGAIN;
  	}
  
  	direction = hwep->dir;
  	do {
  		retval |= hw_ep_set_halt(hwep->ci, hwep->num, hwep->dir, value);
  
  		if (!value)
  			hwep->wedge = 0;
  
  		if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
  			hwep->dir = (hwep->dir == TX) ? RX : TX;
  
  	} while (hwep->dir != direction);
  
  	spin_unlock_irqrestore(hwep->lock, flags);
  	return retval;
  }
  
  
  /**
   * _gadget_stop_activity: stops all USB activity, flushes & disables all endpts
   * @gadget: gadget
   *
   * This function returns an error code
   */
  static int _gadget_stop_activity(struct usb_gadget *gadget)
  {
  	struct usb_ep *ep;
  	struct ci_hdrc    *ci = container_of(gadget, struct ci_hdrc, gadget);
  	unsigned long flags;
  
  	/* flush all endpoints */
  	gadget_for_each_ep(ep, gadget) {
  		usb_ep_fifo_flush(ep);
  	}
  	usb_ep_fifo_flush(&ci->ep0out->ep);
  	usb_ep_fifo_flush(&ci->ep0in->ep);
  
  	/* make sure to disable all endpoints */
  	gadget_for_each_ep(ep, gadget) {
  		usb_ep_disable(ep);
  	}
  
  	if (ci->status != NULL) {
  		usb_ep_free_request(&ci->ep0in->ep, ci->status);
  		ci->status = NULL;
  	}
  
  	spin_lock_irqsave(&ci->lock, flags);
  	ci->gadget.speed = USB_SPEED_UNKNOWN;
  	ci->remote_wakeup = 0;
  	ci->suspended = 0;
  	spin_unlock_irqrestore(&ci->lock, flags);
  
  	return 0;
  }
  
  /******************************************************************************
   * ISR block
   *****************************************************************************/
  /**
   * isr_reset_handler: USB reset interrupt handler
   * @ci: UDC device
   *
   * This function resets USB engine after a bus reset occurred
   */
  static void isr_reset_handler(struct ci_hdrc *ci)
  __releases(ci->lock)
  __acquires(ci->lock)
  {
  	int retval;
  
  	if (ci_otg_is_fsm_mode(ci)) {
  		ci->fsm.otg_srp_reqd = 0;
  		ci->fsm.otg_hnp_reqd = 0;
  	}
  
  	spin_unlock(&ci->lock);
  	if (ci->gadget.speed != USB_SPEED_UNKNOWN)
  		usb_gadget_udc_reset(&ci->gadget, ci->driver);
  
  	retval = _gadget_stop_activity(&ci->gadget);
  	if (retval)
  		goto done;
  
  	retval = hw_usb_reset(ci);
  	if (retval)
  		goto done;
  
  	ci->status = usb_ep_alloc_request(&ci->ep0in->ep, GFP_ATOMIC);
  	if (ci->status == NULL)
  		retval = -ENOMEM;
  
  done:
  	spin_lock(&ci->lock);
  
  	if (retval)
  		dev_err(ci->dev, "error: %i\n", retval);
  }
  
  /**
   * isr_get_status_complete: get_status request complete function
   * @ep:  endpoint
   * @req: request handled
   *
   * Caller must release lock
   */
  static void isr_get_status_complete(struct usb_ep *ep, struct usb_request *req)
  {
  	if (ep == NULL || req == NULL)
  		return;
  
  	kfree(req->buf);
  	usb_ep_free_request(ep, req);
  }
  
  /**
   * _ep_queue: queues (submits) an I/O request to an endpoint
   * @ep:        endpoint
   * @req:       request
   * @gfp_flags: GFP flags (not used)
   *
   * Caller must hold lock
   * This function returns an error code
   */
  static int _ep_queue(struct usb_ep *ep, struct usb_request *req,
  		    gfp_t __maybe_unused gfp_flags)
  {
  	struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
  	struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
  	struct ci_hdrc *ci = hwep->ci;
  	int retval = 0;
  
  	if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
  		return -EINVAL;
  
  	if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
  		if (req->length)
  			hwep = (ci->ep0_dir == RX) ?
  			       ci->ep0out : ci->ep0in;
  		if (!list_empty(&hwep->qh.queue)) {
  			_ep_nuke(hwep);
  			dev_warn(hwep->ci->dev, "endpoint ctrl %X nuked\n",
  				 _usb_addr(hwep));
  		}
  	}
  
  	if (usb_endpoint_xfer_isoc(hwep->ep.desc) &&
  	    hwreq->req.length > (1 + hwep->ep.mult) * hwep->ep.maxpacket) {
  		dev_err(hwep->ci->dev, "request length too big for isochronous\n");
  		return -EMSGSIZE;
  	}
  
  	/* first nuke then test link, e.g. previous status has not sent */
  	if (!list_empty(&hwreq->queue)) {
  		dev_err(hwep->ci->dev, "request already in queue\n");
  		return -EBUSY;
  	}
  
  	/* push request */
  	hwreq->req.status = -EINPROGRESS;
  	hwreq->req.actual = 0;
  
  	retval = _hardware_enqueue(hwep, hwreq);
  
  	if (retval == -EALREADY)
  		retval = 0;
  	if (!retval)
  		list_add_tail(&hwreq->queue, &hwep->qh.queue);
  
  	return retval;
  }
  
  /**
   * isr_get_status_response: get_status request response
   * @ci: ci struct
   * @setup: setup request packet
   *
   * This function returns an error code
   */
  static int isr_get_status_response(struct ci_hdrc *ci,
  				   struct usb_ctrlrequest *setup)
  __releases(hwep->lock)
  __acquires(hwep->lock)
  {
  	struct ci_hw_ep *hwep = ci->ep0in;
  	struct usb_request *req = NULL;
  	gfp_t gfp_flags = GFP_ATOMIC;
  	int dir, num, retval;
  
  	if (hwep == NULL || setup == NULL)
  		return -EINVAL;
  
  	spin_unlock(hwep->lock);
  	req = usb_ep_alloc_request(&hwep->ep, gfp_flags);
  	spin_lock(hwep->lock);
  	if (req == NULL)
  		return -ENOMEM;
  
  	req->complete = isr_get_status_complete;
  	if (setup->wIndex == OTG_STS_SELECTOR)
  		req->length = 1;
  	else
  		req->length = 2;
  	req->buf      = kzalloc(req->length, gfp_flags);
  	if (req->buf == NULL) {
  		retval = -ENOMEM;
  		goto err_free_req;
  	}
  
  	if ((setup->bRequestType & USB_RECIP_MASK) == USB_RECIP_DEVICE) {
  		if ((setup->wIndex == OTG_STS_SELECTOR) &&
  					ci_otg_is_fsm_mode(ci)) {
  			if (ci->gadget.host_request_flag)
  				*(u8 *)req->buf = HOST_REQUEST_FLAG;
  			else
  				*(u8 *)req->buf = 0;
  		} else {
  			*(u16 *)req->buf = (ci->remote_wakeup << 1) |
  				ci->gadget.is_selfpowered;
  		}
  	} else if ((setup->bRequestType & USB_RECIP_MASK) \
  		   == USB_RECIP_ENDPOINT) {
  		dir = (le16_to_cpu(setup->wIndex) & USB_ENDPOINT_DIR_MASK) ?
  			TX : RX;
  		num =  le16_to_cpu(setup->wIndex) & USB_ENDPOINT_NUMBER_MASK;
  		*(u16 *)req->buf = hw_ep_get_halt(ci, num, dir);
  	}
  	/* else do nothing; reserved for future use */
  
  	retval = _ep_queue(&hwep->ep, req, gfp_flags);
  	if (retval)
  		goto err_free_buf;
  
  	return 0;
  
   err_free_buf:
  	kfree(req->buf);
   err_free_req:
  	spin_unlock(hwep->lock);
  	usb_ep_free_request(&hwep->ep, req);
  	spin_lock(hwep->lock);
  	return retval;
  }
  
  /**
   * isr_setup_status_complete: setup_status request complete function
   * @ep:  endpoint
   * @req: request handled
   *
   * Caller must release lock. Put the port in test mode if test mode
   * feature is selected.
   */
  static void
  isr_setup_status_complete(struct usb_ep *ep, struct usb_request *req)
  {
  	struct ci_hdrc *ci = req->context;
  	unsigned long flags;
  
  	if (ci->setaddr) {
  		hw_usb_set_address(ci, ci->address);
  		ci->setaddr = false;
  		if (ci->address)
  			usb_gadget_set_state(&ci->gadget, USB_STATE_ADDRESS);
  	}
  
  	spin_lock_irqsave(&ci->lock, flags);
  	if (ci->test_mode)
  		hw_port_test_set(ci, ci->test_mode);
  	spin_unlock_irqrestore(&ci->lock, flags);
  }
  
  /**
   * isr_setup_status_phase: queues the status phase of a setup transation
   * @ci: ci struct
   *
   * This function returns an error code
   */
  static int isr_setup_status_phase(struct ci_hdrc *ci)
  {
  	int retval;
  	struct ci_hw_ep *hwep;
  
  	hwep = (ci->ep0_dir == TX) ? ci->ep0out : ci->ep0in;
  	ci->status->context = ci;
  	ci->status->complete = isr_setup_status_complete;
  
  	retval = _ep_queue(&hwep->ep, ci->status, GFP_ATOMIC);
  
  	return retval;
  }
  
  /**
   * isr_tr_complete_low: transaction complete low level handler
   * @hwep: endpoint
   *
   * This function returns an error code
   * Caller must hold lock
   */
  static int isr_tr_complete_low(struct ci_hw_ep *hwep)
  __releases(hwep->lock)
  __acquires(hwep->lock)
  {
  	struct ci_hw_req *hwreq, *hwreqtemp;
  	struct ci_hw_ep *hweptemp = hwep;
  	int retval = 0;
  
  	list_for_each_entry_safe(hwreq, hwreqtemp, &hwep->qh.queue,
  			queue) {
  		retval = _hardware_dequeue(hwep, hwreq);
  		if (retval < 0)
  			break;
  		list_del_init(&hwreq->queue);
  		if (hwreq->req.complete != NULL) {
  			spin_unlock(hwep->lock);
  			if ((hwep->type == USB_ENDPOINT_XFER_CONTROL) &&
  					hwreq->req.length)
  				hweptemp = hwep->ci->ep0in;
  			usb_gadget_giveback_request(&hweptemp->ep, &hwreq->req);
  			spin_lock(hwep->lock);
  		}
  	}
  
  	if (retval == -EBUSY)
  		retval = 0;
  
  	return retval;
  }
  
  static int otg_a_alt_hnp_support(struct ci_hdrc *ci)
  {
  	dev_warn(&ci->gadget.dev,
  		"connect the device to an alternate port if you want HNP\n");
  	return isr_setup_status_phase(ci);
  }
  
  static int otg_srp_reqd(struct ci_hdrc *ci)
  {
  	if (ci_otg_is_fsm_mode(ci)) {
  		ci->fsm.otg_srp_reqd = 1;
  		return isr_setup_status_phase(ci);
  	} else {
  		return -ENOTSUPP;
  	}
  }
  
  static int otg_hnp_reqd(struct ci_hdrc *ci)
  {
  	if (ci_otg_is_fsm_mode(ci)) {
  		ci->fsm.otg_hnp_reqd = 1;
  		ci->fsm.b_bus_req = 1;
  		ci->gadget.host_request_flag = 1;
  		return isr_setup_status_phase(ci);
  	} else {
  		return -ENOTSUPP;
  	}
  }
  
  /**
   * isr_setup_packet_handler: setup packet handler
   * @ci: UDC descriptor
   *
   * This function handles setup packet 
   */
  static void isr_setup_packet_handler(struct ci_hdrc *ci)
  __releases(ci->lock)
  __acquires(ci->lock)
  {
  	struct ci_hw_ep *hwep = &ci->ci_hw_ep[0];
  	struct usb_ctrlrequest req;
  	int type, num, dir, err = -EINVAL;
  	u8 tmode = 0;
  
  	/*
  	 * Flush data and handshake transactions of previous
  	 * setup packet.
  	 */
  	_ep_nuke(ci->ep0out);
  	_ep_nuke(ci->ep0in);
  
  	/* read_setup_packet */
  	do {
  		hw_test_and_set_setup_guard(ci);
  		memcpy(&req, &hwep->qh.ptr->setup, sizeof(req));
  	} while (!hw_test_and_clear_setup_guard(ci));
  
  	type = req.bRequestType;
  
  	ci->ep0_dir = (type & USB_DIR_IN) ? TX : RX;
  
  	switch (req.bRequest) {
  	case USB_REQ_CLEAR_FEATURE:
  		if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
  				le16_to_cpu(req.wValue) ==
  				USB_ENDPOINT_HALT) {
  			if (req.wLength != 0)
  				break;
  			num  = le16_to_cpu(req.wIndex);
  			dir = num & USB_ENDPOINT_DIR_MASK;
  			num &= USB_ENDPOINT_NUMBER_MASK;
  			if (dir) /* TX */
  				num += ci->hw_ep_max / 2;
  			if (!ci->ci_hw_ep[num].wedge) {
  				spin_unlock(&ci->lock);
  				err = usb_ep_clear_halt(
  					&ci->ci_hw_ep[num].ep);
  				spin_lock(&ci->lock);
  				if (err)
  					break;
  			}
  			err = isr_setup_status_phase(ci);
  		} else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE) &&
  				le16_to_cpu(req.wValue) ==
  				USB_DEVICE_REMOTE_WAKEUP) {
  			if (req.wLength != 0)
  				break;
  			ci->remote_wakeup = 0;
  			err = isr_setup_status_phase(ci);
  		} else {
  			goto delegate;
  		}
  		break;
  	case USB_REQ_GET_STATUS:
  		if (type != (USB_DIR_IN|USB_RECIP_DEVICE)   &&
  		    type != (USB_DIR_IN|USB_RECIP_ENDPOINT) &&
  		    type != (USB_DIR_IN|USB_RECIP_INTERFACE))
  			goto delegate;
  		if ((le16_to_cpu(req.wLength) != 2 &&
  			le16_to_cpu(req.wLength) != 1) ||
  				le16_to_cpu(req.wValue) != 0)
  			break;
  		err = isr_get_status_response(ci, &req);
  		break;
  	case USB_REQ_SET_ADDRESS:
  		if (type != (USB_DIR_OUT|USB_RECIP_DEVICE))
  			goto delegate;
  		if (le16_to_cpu(req.wLength) != 0 ||
  		    le16_to_cpu(req.wIndex)  != 0)
  			break;
  		ci->address = (u8)le16_to_cpu(req.wValue);
  		ci->setaddr = true;
  		err = isr_setup_status_phase(ci);
  		break;
  	case USB_REQ_SET_FEATURE:
  		if (type == (USB_DIR_OUT|USB_RECIP_ENDPOINT) &&
  				le16_to_cpu(req.wValue) ==
  				USB_ENDPOINT_HALT) {
  			if (req.wLength != 0)
  				break;
  			num  = le16_to_cpu(req.wIndex);
  			dir = num & USB_ENDPOINT_DIR_MASK;
  			num &= USB_ENDPOINT_NUMBER_MASK;
  			if (dir) /* TX */
  				num += ci->hw_ep_max / 2;
  
  			spin_unlock(&ci->lock);
  			err = _ep_set_halt(&ci->ci_hw_ep[num].ep, 1, false);
  			spin_lock(&ci->lock);
  			if (!err)
  				isr_setup_status_phase(ci);
  		} else if (type == (USB_DIR_OUT|USB_RECIP_DEVICE)) {
  			if (req.wLength != 0)
  				break;
  			switch (le16_to_cpu(req.wValue)) {
  			case USB_DEVICE_REMOTE_WAKEUP:
  				ci->remote_wakeup = 1;
  				err = isr_setup_status_phase(ci);
  				break;
  			case USB_DEVICE_TEST_MODE:
  				tmode = le16_to_cpu(req.wIndex) >> 8;
  				switch (tmode) {
  				case TEST_J:
  				case TEST_K:
  				case TEST_SE0_NAK:
  				case TEST_PACKET:
  				case TEST_FORCE_EN:
  					ci->test_mode = tmode;
  					err = isr_setup_status_phase(
  							ci);
  					break;
  				case TEST_OTG_SRP_REQD:
  					err = otg_srp_reqd(ci);
  					break;
  				case TEST_OTG_HNP_REQD:
  					err = otg_hnp_reqd(ci);
  					break;
  				default:
  					break;
  				}
  				break;
  			case USB_DEVICE_B_HNP_ENABLE:
  				if (ci_otg_is_fsm_mode(ci)) {
  					ci->gadget.b_hnp_enable = 1;
  					err = isr_setup_status_phase(
  							ci);
  				}
  				break;
  			case USB_DEVICE_A_ALT_HNP_SUPPORT:
  				if (ci_otg_is_fsm_mode(ci))
  					err = otg_a_alt_hnp_support(ci);
  				break;
  			case USB_DEVICE_A_HNP_SUPPORT:
  				if (ci_otg_is_fsm_mode(ci)) {
  					ci->gadget.a_hnp_support = 1;
  					err = isr_setup_status_phase(
  							ci);
  				}
  				break;
  			default:
  				goto delegate;
  			}
  		} else {
  			goto delegate;
  		}
  		break;
  	default:
  delegate:
  		if (req.wLength == 0)   /* no data phase */
  			ci->ep0_dir = TX;
  
  		spin_unlock(&ci->lock);
  		err = ci->driver->setup(&ci->gadget, &req);
  		spin_lock(&ci->lock);
  		break;
  	}
  
  	if (err < 0) {
  		spin_unlock(&ci->lock);
  		if (_ep_set_halt(&hwep->ep, 1, false))
  			dev_err(ci->dev, "error: _ep_set_halt\n");
  		spin_lock(&ci->lock);
  	}
  }
  
  /**
   * isr_tr_complete_handler: transaction complete interrupt handler
   * @ci: UDC descriptor
   *
   * This function handles traffic events
   */
  static void isr_tr_complete_handler(struct ci_hdrc *ci)
  __releases(ci->lock)
  __acquires(ci->lock)
  {
  	unsigned i;
  	int err;
  
  	for (i = 0; i < ci->hw_ep_max; i++) {
  		struct ci_hw_ep *hwep  = &ci->ci_hw_ep[i];
  
  		if (hwep->ep.desc == NULL)
  			continue;   /* not configured */
  
  		if (hw_test_and_clear_complete(ci, i)) {
  			err = isr_tr_complete_low(hwep);
  			if (hwep->type == USB_ENDPOINT_XFER_CONTROL) {
  				if (err > 0)   /* needs status phase */
  					err = isr_setup_status_phase(ci);
  				if (err < 0) {
  					spin_unlock(&ci->lock);
  					if (_ep_set_halt(&hwep->ep, 1, false))
  						dev_err(ci->dev,
  						"error: _ep_set_halt\n");
  					spin_lock(&ci->lock);
  				}
  			}
  		}
  
  		/* Only handle setup packet below */
  		if (i == 0 &&
  			hw_test_and_clear(ci, OP_ENDPTSETUPSTAT, BIT(0)))
  			isr_setup_packet_handler(ci);
  	}
  }
  
  /******************************************************************************
   * ENDPT block
   *****************************************************************************/
  /**
   * ep_enable: configure endpoint, making it usable
   *
   * Check usb_ep_enable() at "usb_gadget.h" for details
   */
  static int ep_enable(struct usb_ep *ep,
  		     const struct usb_endpoint_descriptor *desc)
  {
  	struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
  	int retval = 0;
  	unsigned long flags;
  	u32 cap = 0;
  
  	if (ep == NULL || desc == NULL)
  		return -EINVAL;
  
  	spin_lock_irqsave(hwep->lock, flags);
  
  	/* only internal SW should enable ctrl endpts */
  
  	if (!list_empty(&hwep->qh.queue)) {
  		dev_warn(hwep->ci->dev, "enabling a non-empty endpoint!\n");
  		spin_unlock_irqrestore(hwep->lock, flags);
  		return -EBUSY;
  	}
  
  	hwep->ep.desc = desc;
  
  	hwep->dir  = usb_endpoint_dir_in(desc) ? TX : RX;
  	hwep->num  = usb_endpoint_num(desc);
  	hwep->type = usb_endpoint_type(desc);
  
  	hwep->ep.maxpacket = usb_endpoint_maxp(desc) & 0x07ff;
  	hwep->ep.mult = QH_ISO_MULT(usb_endpoint_maxp(desc));
  
  	if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
  		cap |= QH_IOS;
  
  	cap |= QH_ZLT;
  	cap |= (hwep->ep.maxpacket << __ffs(QH_MAX_PKT)) & QH_MAX_PKT;
  	/*
  	 * For ISO-TX, we set mult at QH as the largest value, and use
  	 * MultO at TD as real mult value.
  	 */
  	if (hwep->type == USB_ENDPOINT_XFER_ISOC && hwep->dir == TX)
  		cap |= 3 << __ffs(QH_MULT);
  
  	hwep->qh.ptr->cap = cpu_to_le32(cap);
  
  	hwep->qh.ptr->td.next |= cpu_to_le32(TD_TERMINATE);   /* needed? */
  
  	if (hwep->num != 0 && hwep->type == USB_ENDPOINT_XFER_CONTROL) {
  		dev_err(hwep->ci->dev, "Set control xfer at non-ep0\n");
  		retval = -EINVAL;
  	}
  
  	/*
  	 * Enable endpoints in the HW other than ep0 as ep0
  	 * is always enabled
  	 */
  	if (hwep->num)
  		retval |= hw_ep_enable(hwep->ci, hwep->num, hwep->dir,
  				       hwep->type);
  
  	spin_unlock_irqrestore(hwep->lock, flags);
  	return retval;
  }
  
  /**
   * ep_disable: endpoint is no longer usable
   *
   * Check usb_ep_disable() at "usb_gadget.h" for details
   */
  static int ep_disable(struct usb_ep *ep)
  {
  	struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
  	int direction, retval = 0;
  	unsigned long flags;
  
  	if (ep == NULL)
  		return -EINVAL;
  	else if (hwep->ep.desc == NULL)
  		return -EBUSY;
  
  	spin_lock_irqsave(hwep->lock, flags);
  	if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
  		spin_unlock_irqrestore(hwep->lock, flags);
  		return 0;
  	}
  
  	/* only internal SW should disable ctrl endpts */
  
  	direction = hwep->dir;
  	do {
  		retval |= _ep_nuke(hwep);
  		retval |= hw_ep_disable(hwep->ci, hwep->num, hwep->dir);
  
  		if (hwep->type == USB_ENDPOINT_XFER_CONTROL)
  			hwep->dir = (hwep->dir == TX) ? RX : TX;
  
  	} while (hwep->dir != direction);
  
  	hwep->ep.desc = NULL;
  
  	spin_unlock_irqrestore(hwep->lock, flags);
  	return retval;
  }
  
  /**
   * ep_alloc_request: allocate a request object to use with this endpoint
   *
   * Check usb_ep_alloc_request() at "usb_gadget.h" for details
   */
  static struct usb_request *ep_alloc_request(struct usb_ep *ep, gfp_t gfp_flags)
  {
  	struct ci_hw_req *hwreq = NULL;
  
  	if (ep == NULL)
  		return NULL;
  
  	hwreq = kzalloc(sizeof(struct ci_hw_req), gfp_flags);
  	if (hwreq != NULL) {
  		INIT_LIST_HEAD(&hwreq->queue);
  		INIT_LIST_HEAD(&hwreq->tds);
  	}
  
  	return (hwreq == NULL) ? NULL : &hwreq->req;
  }
  
  /**
   * ep_free_request: frees a request object
   *
   * Check usb_ep_free_request() at "usb_gadget.h" for details
   */
  static void ep_free_request(struct usb_ep *ep, struct usb_request *req)
  {
  	struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
  	struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
  	struct td_node *node, *tmpnode;
  	unsigned long flags;
  
  	if (ep == NULL || req == NULL) {
  		return;
  	} else if (!list_empty(&hwreq->queue)) {
  		dev_err(hwep->ci->dev, "freeing queued request\n");
  		return;
  	}
  
  	spin_lock_irqsave(hwep->lock, flags);
  
  	list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
  		dma_pool_free(hwep->td_pool, node->ptr, node->dma);
  		list_del_init(&node->td);
  		node->ptr = NULL;
  		kfree(node);
  	}
  
  	kfree(hwreq);
  
  	spin_unlock_irqrestore(hwep->lock, flags);
  }
  
  /**
   * ep_queue: queues (submits) an I/O request to an endpoint
   *
   * Check usb_ep_queue()* at usb_gadget.h" for details
   */
  static int ep_queue(struct usb_ep *ep, struct usb_request *req,
  		    gfp_t __maybe_unused gfp_flags)
  {
  	struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
  	int retval = 0;
  	unsigned long flags;
  
  	if (ep == NULL || req == NULL || hwep->ep.desc == NULL)
  		return -EINVAL;
  
  	spin_lock_irqsave(hwep->lock, flags);
  	if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
  		spin_unlock_irqrestore(hwep->lock, flags);
  		return 0;
  	}
  	retval = _ep_queue(ep, req, gfp_flags);
  	spin_unlock_irqrestore(hwep->lock, flags);
  	return retval;
  }
  
  /**
   * ep_dequeue: dequeues (cancels, unlinks) an I/O request from an endpoint
   *
   * Check usb_ep_dequeue() at "usb_gadget.h" for details
   */
  static int ep_dequeue(struct usb_ep *ep, struct usb_request *req)
  {
  	struct ci_hw_ep  *hwep  = container_of(ep,  struct ci_hw_ep, ep);
  	struct ci_hw_req *hwreq = container_of(req, struct ci_hw_req, req);
  	unsigned long flags;
  	struct td_node *node, *tmpnode;
  
  	if (ep == NULL || req == NULL || hwreq->req.status != -EALREADY ||
  		hwep->ep.desc == NULL || list_empty(&hwreq->queue) ||
  		list_empty(&hwep->qh.queue))
  		return -EINVAL;
  
  	spin_lock_irqsave(hwep->lock, flags);
  	if (hwep->ci->gadget.speed != USB_SPEED_UNKNOWN)
  		hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
  
  	list_for_each_entry_safe(node, tmpnode, &hwreq->tds, td) {
  		dma_pool_free(hwep->td_pool, node->ptr, node->dma);
  		list_del(&node->td);
  		kfree(node);
  	}
  
  	/* pop request */
  	list_del_init(&hwreq->queue);
  
  	usb_gadget_unmap_request(&hwep->ci->gadget, req, hwep->dir);
  
  	req->status = -ECONNRESET;
  
  	if (hwreq->req.complete != NULL) {
  		spin_unlock(hwep->lock);
  		usb_gadget_giveback_request(&hwep->ep, &hwreq->req);
  		spin_lock(hwep->lock);
  	}
  
  	spin_unlock_irqrestore(hwep->lock, flags);
  	return 0;
  }
  
  /**
   * ep_set_halt: sets the endpoint halt feature
   *
   * Check usb_ep_set_halt() at "usb_gadget.h" for details
   */
  static int ep_set_halt(struct usb_ep *ep, int value)
  {
  	return _ep_set_halt(ep, value, true);
  }
  
  /**
   * ep_set_wedge: sets the halt feature and ignores clear requests
   *
   * Check usb_ep_set_wedge() at "usb_gadget.h" for details
   */
  static int ep_set_wedge(struct usb_ep *ep)
  {
  	struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
  	unsigned long flags;
  
  	if (ep == NULL || hwep->ep.desc == NULL)
  		return -EINVAL;
  
  	spin_lock_irqsave(hwep->lock, flags);
  	hwep->wedge = 1;
  	spin_unlock_irqrestore(hwep->lock, flags);
  
  	return usb_ep_set_halt(ep);
  }
  
  /**
   * ep_fifo_flush: flushes contents of a fifo
   *
   * Check usb_ep_fifo_flush() at "usb_gadget.h" for details
   */
  static void ep_fifo_flush(struct usb_ep *ep)
  {
  	struct ci_hw_ep *hwep = container_of(ep, struct ci_hw_ep, ep);
  	unsigned long flags;
  
  	if (ep == NULL) {
  		dev_err(hwep->ci->dev, "%02X: -EINVAL\n", _usb_addr(hwep));
  		return;
  	}
  
  	spin_lock_irqsave(hwep->lock, flags);
  	if (hwep->ci->gadget.speed == USB_SPEED_UNKNOWN) {
  		spin_unlock_irqrestore(hwep->lock, flags);
  		return;
  	}
  
  	hw_ep_flush(hwep->ci, hwep->num, hwep->dir);
  
  	spin_unlock_irqrestore(hwep->lock, flags);
  }
  
  /**
   * Endpoint-specific part of the API to the USB controller hardware
   * Check "usb_gadget.h" for details
   */
  static const struct usb_ep_ops usb_ep_ops = {
  	.enable	       = ep_enable,
  	.disable       = ep_disable,
  	.alloc_request = ep_alloc_request,
  	.free_request  = ep_free_request,
  	.queue	       = ep_queue,
  	.dequeue       = ep_dequeue,
  	.set_halt      = ep_set_halt,
  	.set_wedge     = ep_set_wedge,
  	.fifo_flush    = ep_fifo_flush,
  };
  
  /******************************************************************************
   * GADGET block
   *****************************************************************************/
  static int ci_udc_vbus_session(struct usb_gadget *_gadget, int is_active)
  {
  	struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
  	unsigned long flags;
  	int gadget_ready = 0;
  
  	spin_lock_irqsave(&ci->lock, flags);
  	ci->vbus_active = is_active;
  	if (ci->driver)
  		gadget_ready = 1;
  	spin_unlock_irqrestore(&ci->lock, flags);
  
  	/* Charger Detection */
  	ci_usb_charger_connect(ci, is_active);
  
  	if (gadget_ready)
  		ci_hdrc_gadget_connect(_gadget, is_active);
  
  	return 0;
  }
  
  static int ci_udc_wakeup(struct usb_gadget *_gadget)
  {
  	struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
  	unsigned long flags;
  	int ret = 0;
  
  	spin_lock_irqsave(&ci->lock, flags);
  	if (ci->gadget.speed == USB_SPEED_UNKNOWN) {
  		spin_unlock_irqrestore(&ci->lock, flags);
  		return 0;
  	}
  	if (!ci->remote_wakeup) {
  		ret = -EOPNOTSUPP;
  		goto out;
  	}
  	if (!hw_read(ci, OP_PORTSC, PORTSC_SUSP)) {
  		ret = -EINVAL;
  		goto out;
  	}
  	hw_write(ci, OP_PORTSC, PORTSC_FPR, PORTSC_FPR);
  out:
  	spin_unlock_irqrestore(&ci->lock, flags);
  	return ret;
  }
  
  static int ci_udc_vbus_draw(struct usb_gadget *_gadget, unsigned ma)
  {
  	struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
  
  	if (ci->usb_phy)
  		return usb_phy_set_power(ci->usb_phy, ma);
  	return -ENOTSUPP;
  }
  
  static int ci_udc_selfpowered(struct usb_gadget *_gadget, int is_on)
  {
  	struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
  	struct ci_hw_ep *hwep = ci->ep0in;
  	unsigned long flags;
  
  	spin_lock_irqsave(hwep->lock, flags);
  	_gadget->is_selfpowered = (is_on != 0);
  	spin_unlock_irqrestore(hwep->lock, flags);
  
  	return 0;
  }
  
  /* Change Data+ pullup status
   * this func is used by usb_gadget_connect/disconnet
   */
  static int ci_udc_pullup(struct usb_gadget *_gadget, int is_on)
  {
  	struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
  
  	/* Data+ pullup controlled by OTG state machine in OTG fsm mode */
  	if (ci_otg_is_fsm_mode(ci))
  		return 0;
  
  	pm_runtime_get_sync(&ci->gadget.dev);
  	if (is_on)
  		hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
  	else
  		hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
  	pm_runtime_put_sync(&ci->gadget.dev);
  
  	return 0;
  }
  
  static int ci_udc_start(struct usb_gadget *gadget,
  			 struct usb_gadget_driver *driver);
  static int ci_udc_stop(struct usb_gadget *gadget);
  /**
   * Device operations part of the API to the USB controller hardware,
   * which don't involve endpoints (or i/o)
   * Check  "usb_gadget.h" for details
   */
  static const struct usb_gadget_ops usb_gadget_ops = {
  	.vbus_session	= ci_udc_vbus_session,
  	.wakeup		= ci_udc_wakeup,
  	.set_selfpowered	= ci_udc_selfpowered,
  	.pullup		= ci_udc_pullup,
  	.vbus_draw	= ci_udc_vbus_draw,
  	.udc_start	= ci_udc_start,
  	.udc_stop	= ci_udc_stop,
  };
  
  static int init_eps(struct ci_hdrc *ci)
  {
  	int retval = 0, i, j;
  
  	for (i = 0; i < ci->hw_ep_max/2; i++)
  		for (j = RX; j <= TX; j++) {
  			int k = i + j * ci->hw_ep_max/2;
  			struct ci_hw_ep *hwep = &ci->ci_hw_ep[k];
  
  			scnprintf(hwep->name, sizeof(hwep->name), "ep%i%s", i,
  					(j == TX)  ? "in" : "out");
  
  			hwep->ci          = ci;
  			hwep->lock         = &ci->lock;
  			hwep->td_pool      = ci->td_pool;
  
  			hwep->ep.name      = hwep->name;
  			hwep->ep.ops       = &usb_ep_ops;
  			/*
  			 * for ep0: maxP defined in desc, for other
  			 * eps, maxP is set by epautoconfig() called
  			 * by gadget layer
  			 */
  			usb_ep_set_maxpacket_limit(&hwep->ep, (unsigned short)~0);
  
  			INIT_LIST_HEAD(&hwep->qh.queue);
  			hwep->qh.ptr = dma_pool_alloc(ci->qh_pool, GFP_KERNEL,
  						     &hwep->qh.dma);
  			if (hwep->qh.ptr == NULL)
  				retval = -ENOMEM;
  			else
  				memset(hwep->qh.ptr, 0, sizeof(*hwep->qh.ptr));
  
  			/*
  			 * set up shorthands for ep0 out and in endpoints,
  			 * don't add to gadget's ep_list
  			 */
  			if (i == 0) {
  				if (j == RX)
  					ci->ep0out = hwep;
  				else
  					ci->ep0in = hwep;
  
  				usb_ep_set_maxpacket_limit(&hwep->ep, CTRL_PAYLOAD_MAX);
  				continue;
  			}
  
  			list_add_tail(&hwep->ep.ep_list, &ci->gadget.ep_list);
  		}
  
  	return retval;
  }
  
  static void destroy_eps(struct ci_hdrc *ci)
  {
  	int i;
  
  	for (i = 0; i < ci->hw_ep_max; i++) {
  		struct ci_hw_ep *hwep = &ci->ci_hw_ep[i];
  
  		if (hwep->pending_td)
  			free_pending_td(hwep);
  		dma_pool_free(ci->qh_pool, hwep->qh.ptr, hwep->qh.dma);
  	}
  }
  
  /**
   * ci_udc_start: register a gadget driver
   * @gadget: our gadget
   * @driver: the driver being registered
   *
   * Interrupts are enabled here.
   */
  static int ci_udc_start(struct usb_gadget *gadget,
  			 struct usb_gadget_driver *driver)
  {
  	struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
  	int retval = -ENOMEM;
  
  	if (driver->disconnect == NULL)
  		return -EINVAL;
  
  
  	ci->ep0out->ep.desc = &ctrl_endpt_out_desc;
  	retval = usb_ep_enable(&ci->ep0out->ep);
  	if (retval)
  		return retval;
  
  	ci->ep0in->ep.desc = &ctrl_endpt_in_desc;
  	retval = usb_ep_enable(&ci->ep0in->ep);
  	if (retval)
  		return retval;
  
  	ci->driver = driver;
  
  	/* Start otg fsm for B-device */
  	if (ci_otg_is_fsm_mode(ci)) {
  		if (ci->fsm.id)
  			ci_hdrc_otg_fsm_start(ci);
  		return retval;
  	}
  
  	if (ci->vbus_active)
  		ci_hdrc_gadget_connect(&ci->gadget, 1);
  
  	return retval;
  }
  
  static void ci_udc_stop_for_otg_fsm(struct ci_hdrc *ci)
  {
  	if (!ci_otg_is_fsm_mode(ci))
  		return;
  
  	mutex_lock(&ci->fsm.lock);
  	if (ci->fsm.otg->state == OTG_STATE_A_PERIPHERAL) {
  		ci->fsm.a_bidl_adis_tmout = 1;
  		ci_hdrc_otg_fsm_start(ci);
  	} else if (ci->fsm.otg->state == OTG_STATE_B_PERIPHERAL) {
  		ci->fsm.protocol = PROTO_UNDEF;
  		ci->fsm.otg->state = OTG_STATE_UNDEFINED;
  	}
  	mutex_unlock(&ci->fsm.lock);
  }
  
  /**
   * ci_udc_stop: unregister a gadget driver
   */
  static int ci_udc_stop(struct usb_gadget *gadget)
  {
  	struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
  	unsigned long flags;
  
  	spin_lock_irqsave(&ci->lock, flags);
  
  	if (ci->vbus_active) {
  		hw_device_state(ci, 0);
  		if (ci->platdata->notify_event)
  			ci->platdata->notify_event(ci,
  			CI_HDRC_CONTROLLER_STOPPED_EVENT);
  		spin_unlock_irqrestore(&ci->lock, flags);
  		_gadget_stop_activity(&ci->gadget);
  		spin_lock_irqsave(&ci->lock, flags);
  		pm_runtime_put(&ci->gadget.dev);
  	}
  
  	ci->driver = NULL;
  	spin_unlock_irqrestore(&ci->lock, flags);
  
  	ci_udc_stop_for_otg_fsm(ci);
  	return 0;
  }
  
  /******************************************************************************
   * BUS block
   *****************************************************************************/
  /**
   * udc_irq: ci interrupt handler
   *
   * This function returns IRQ_HANDLED if the IRQ has been handled
   * It locks access to registers
   */
  static irqreturn_t udc_irq(struct ci_hdrc *ci)
  {
  	irqreturn_t retval;
  	u32 intr;
  
  	if (ci == NULL)
  		return IRQ_HANDLED;
  
  	spin_lock(&ci->lock);
  
  	if (ci->platdata->flags & CI_HDRC_REGS_SHARED) {
  		if (hw_read(ci, OP_USBMODE, USBMODE_CM) !=
  				USBMODE_CM_DC) {
  			spin_unlock(&ci->lock);
  			return IRQ_NONE;
  		}
  	}
  	intr = hw_test_and_clear_intr_active(ci);
  
  	if (intr) {
  		/* order defines priority - do NOT change it */
  		if (USBi_URI & intr)
  			isr_reset_handler(ci);
  
  		if (USBi_PCI & intr) {
  			ci->gadget.speed = hw_port_is_high_speed(ci) ?
  				USB_SPEED_HIGH : USB_SPEED_FULL;
  			if (ci->suspended && ci->driver->resume) {
  				spin_unlock(&ci->lock);
  				ci->driver->resume(&ci->gadget);
  				spin_lock(&ci->lock);
  				ci->suspended = 0;
  			}
  		}
  
  		if (USBi_UI  & intr)
  			isr_tr_complete_handler(ci);
  
  		if (USBi_SLI & intr) {
  			if (ci->gadget.speed != USB_SPEED_UNKNOWN &&
  			    ci->driver->suspend) {
  				ci->suspended = 1;
  				spin_unlock(&ci->lock);
  				ci->driver->suspend(&ci->gadget);
  				usb_gadget_set_state(&ci->gadget,
  						USB_STATE_SUSPENDED);
  				spin_lock(&ci->lock);
  			}
  		}
  		retval = IRQ_HANDLED;
  	} else {
  		retval = IRQ_NONE;
  	}
  	spin_unlock(&ci->lock);
  
  	return retval;
  }
  
  /**
   * udc_start: initialize gadget role
   * @ci: chipidea controller
   */
  static int udc_start(struct ci_hdrc *ci)
  {
  	struct device *dev = ci->dev;
  	struct usb_otg_caps *otg_caps = &ci->platdata->ci_otg_caps;
  	int retval = 0;
  
  	spin_lock_init(&ci->lock);
  
  	ci->gadget.ops          = &usb_gadget_ops;
  	ci->gadget.speed        = USB_SPEED_UNKNOWN;
  	ci->gadget.max_speed    = USB_SPEED_HIGH;
  	ci->gadget.name         = ci->platdata->name;
  	ci->gadget.otg_caps	= otg_caps;
  
  	if (ci->is_otg && (otg_caps->hnp_support || otg_caps->srp_support ||
  						otg_caps->adp_support))
  		ci->gadget.is_otg = 1;
  
  	INIT_LIST_HEAD(&ci->gadget.ep_list);
  
  	/* alloc resources */
  	ci->qh_pool = dma_pool_create("ci_hw_qh", dev,
  				       sizeof(struct ci_hw_qh),
  				       64, CI_HDRC_PAGE_SIZE);
  	if (ci->qh_pool == NULL)
  		return -ENOMEM;
  
  	ci->td_pool = dma_pool_create("ci_hw_td", dev,
  				       sizeof(struct ci_hw_td),
  				       64, CI_HDRC_PAGE_SIZE);
  	if (ci->td_pool == NULL) {
  		retval = -ENOMEM;
  		goto free_qh_pool;
  	}
  
  	retval = init_eps(ci);
  	if (retval)
  		goto free_pools;
  
  	ci->gadget.ep0 = &ci->ep0in->ep;
  
  	retval = usb_add_gadget_udc(dev, &ci->gadget);
  	if (retval)
  		goto destroy_eps;
  
  	pm_runtime_no_callbacks(&ci->gadget.dev);
  	pm_runtime_enable(&ci->gadget.dev);
  
  	return retval;
  
  destroy_eps:
  	destroy_eps(ci);
  free_pools:
  	dma_pool_destroy(ci->td_pool);
  free_qh_pool:
  	dma_pool_destroy(ci->qh_pool);
  	return retval;
  }
  
  /**
   * ci_hdrc_gadget_destroy: parent remove must call this to remove UDC
   *
   * No interrupts active, the IRQ has been released
   */
  void ci_hdrc_gadget_destroy(struct ci_hdrc *ci)
  {
  	if (!ci->roles[CI_ROLE_GADGET])
  		return;
  
  	usb_del_gadget_udc(&ci->gadget);
  
  	destroy_eps(ci);
  
  	dma_pool_destroy(ci->td_pool);
  	dma_pool_destroy(ci->qh_pool);
  }
  
  int ci_usb_charger_connect(struct ci_hdrc *ci, int is_active)
  {
  	int ret = 0;
  
  	if (is_active)
  		pm_runtime_get_sync(ci->dev);
  
  	if (ci->platdata->notify_event) {
  		if (is_active)
  			hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
  
  		ret = ci->platdata->notify_event(ci,
  				CI_HDRC_CONTROLLER_VBUS_EVENT);
  		if (ret == CI_HDRC_NOTIFY_RET_DEFER_EVENT) {
  			hw_device_reset(ci);
  			/* Pull up dp */
  			hw_write(ci, OP_USBCMD, USBCMD_RS, USBCMD_RS);
  			ci->platdata->notify_event(ci,
  				CI_HDRC_CONTROLLER_CHARGER_POST_EVENT);
  			/* Pull down dp */
  			hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
  		}
  	}
  
  	if (!is_active)
  		pm_runtime_put_sync(ci->dev);
  
  	return ret;
  }
  
  /**
   * ci_hdrc_gadget_connect: caller make sure gadget driver is binded
   */
  void ci_hdrc_gadget_connect(struct usb_gadget *gadget, int is_active)
  {
  	struct ci_hdrc *ci = container_of(gadget, struct ci_hdrc, gadget);
  
  	if (is_active) {
  		pm_runtime_get_sync(&gadget->dev);
  		hw_device_reset(ci);
  		hw_device_state(ci, ci->ep0out->qh.dma);
  		usb_gadget_set_state(gadget, USB_STATE_POWERED);
  		usb_udc_vbus_handler(gadget, true);
  	} else {
  		usb_udc_vbus_handler(gadget, false);
  		if (ci->driver)
  			ci->driver->disconnect(gadget);
  		hw_device_state(ci, 0);
  		if (ci->platdata->notify_event)
  			ci->platdata->notify_event(ci,
  			CI_HDRC_CONTROLLER_STOPPED_EVENT);
  		_gadget_stop_activity(gadget);
  		pm_runtime_put_sync(&gadget->dev);
  		usb_gadget_set_state(gadget, USB_STATE_NOTATTACHED);
  	}
  }
  
  static int udc_id_switch_for_device(struct ci_hdrc *ci)
  {
  	if (!ci->is_otg)
  		return 0;
  
  	/*
  	 * Clear and enable BSV irq for A-device switch to B-device
  	 * (in otg fsm mode, means A_IDLE->B_DILE) due to ID change.
  	 */
  	if (!ci_otg_is_fsm_mode(ci) ||
  			ci->fsm.otg->state == OTG_STATE_A_IDLE) {
  		hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
  					OTGSC_BSVIS | OTGSC_BSVIE);
  		ci->vbus_glitch_check_event = true;
  		ci_otg_queue_work(ci);
  	}
  
  	return 0;
  }
  
  static void udc_id_switch_for_host(struct ci_hdrc *ci)
  {
  	if (!ci->is_otg)
  		return;
  
  	/*
  	 * Clear and disbale BSV irq for B-device switch to A-device
  	 * (in otg fsm mode, means B_IDLE->A_IDLE) due to ID change.
  	 */
  	if (!ci_otg_is_fsm_mode(ci) ||
  			ci->fsm.otg->state == OTG_STATE_B_IDLE ||
  			ci->fsm.otg->state == OTG_STATE_UNDEFINED)
  		hw_write_otgsc(ci, OTGSC_BSVIE | OTGSC_BSVIS, OTGSC_BSVIS);
  }
  
  static void udc_suspend_for_power_lost(struct ci_hdrc *ci)
  {
  	/*
  	 * Set OP_ENDPTLISTADDR to be non-zero for
  	 * checking if controller resume from power lost
  	 * in non-host mode.
  	 */
  	if (hw_read(ci, OP_ENDPTLISTADDR, ~0) == 0)
  		hw_write(ci, OP_ENDPTLISTADDR, ~0, ~0);
  }
  
  /* Power lost with device mode */
  static void udc_resume_from_power_lost(struct ci_hdrc *ci)
  {
  	if (ci->is_otg) {
  		hw_write_otgsc(ci, OTGSC_BSVIS | OTGSC_BSVIE,
  					OTGSC_BSVIS | OTGSC_BSVIE);
  		ci->vbus_glitch_check_event = true;
  		ci_otg_queue_work(ci);
  	}
  }
  
  static void udc_suspend(struct ci_hdrc *ci)
  {
  	udc_suspend_for_power_lost(ci);
  
  	if (ci->driver && ci->vbus_active &&
  			(ci->gadget.state != USB_STATE_SUSPENDED))
  		usb_gadget_disconnect(&ci->gadget);
  }
  
  static void udc_resume(struct ci_hdrc *ci, bool power_lost)
  {
  	if (power_lost) {
  		udc_resume_from_power_lost(ci);
  	} else {
  		if (ci->driver && ci->vbus_active)
  			usb_gadget_connect(&ci->gadget);
  	}
  }
  
  /**
   * ci_hdrc_gadget_init - initialize device related bits
   * ci: the controller
   *
   * This function initializes the gadget, if the device is "device capable".
   */
  int ci_hdrc_gadget_init(struct ci_hdrc *ci)
  {
  	struct ci_role_driver *rdrv;
  
  	if (!hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DC))
  		return -ENXIO;
  
  	rdrv = devm_kzalloc(ci->dev, sizeof(struct ci_role_driver), GFP_KERNEL);
  	if (!rdrv)
  		return -ENOMEM;
  
  	rdrv->start	= udc_id_switch_for_device;
  	rdrv->stop	= udc_id_switch_for_host;
  	rdrv->irq	= udc_irq;
  	rdrv->suspend	= udc_suspend;
  	rdrv->resume	= udc_resume;
  	rdrv->name	= "gadget";
  	ci->roles[CI_ROLE_GADGET] = rdrv;
  
  	return udc_start(ci);
  }
  