/* ========================================================================== * $File: //dwh/usb_iip/dev/software/otg_ipmate/linux/drivers/dwc_otg_pcd.c $ * $Revision: #18 $ * $Date: 2007/02/07 $ * $Change: 791271 $ * * Synopsys HS OTG Linux Software Driver and documentation (hereinafter, * "Software") is an Unsupported proprietary work of Synopsys, Inc. unless * otherwise expressly agreed to in writing between Synopsys and you. * * The Software IS NOT an item of Licensed Software or Licensed Product under * any End User Software License Agreement or Agreement for Licensed Product * with Synopsys or any supplement thereto. You are permitted to use and * redistribute this Software in source and binary forms, with or without * modification, provided that redistributions of source code must retain this * notice. You may not view, use, disclose, copy or distribute this file or * any information contained herein except pursuant to this license grant from * Synopsys. If you do not agree with this notice, including the disclaimer * below, then you are not authorized to use the Software. * * THIS SOFTWARE IS BEING DISTRIBUTED BY SYNOPSYS SOLELY ON AN "AS IS" BASIS * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE HEREBY DISCLAIMED. IN NO EVENT SHALL SYNOPSYS BE LIABLE FOR ANY DIRECT, * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH * DAMAGE. * ========================================================================== */ #ifndef CONFIG_DWC_HOST_ONLY /** @file * This file implements the Peripheral Controller Driver. * * The Peripheral Controller Driver (PCD) is responsible for * translating requests from the Function Driver into the appropriate * actions on the DWC_otg controller. It isolates the Function Driver * from the specifics of the controller by providing an API to the * Function Driver. * * The Peripheral Controller Driver for Linux will implement the * Gadget API, so that the existing Gadget drivers can be used. * (Gadget Driver is the Linux terminology for a Function Driver.) * * The Linux Gadget API is defined in the header file * . The USB EP operations API is * defined in the structure usb_ep_ops and the USB * Controller API is defined in the structure * usb_gadget_ops. * * An important function of the PCD is managing interrupts generated * by the DWC_otg controller. The implementation of the DWC_otg device * mode interrupt service routines is in dwc_otg_pcd_intr.c. * * @todo Add Device Mode test modes (Test J mode, Test K mode, etc). * @todo Does it work when the request size is greater than DEPTSIZ * transfer size * */ #include #include #include #include #include #include #include #include #include #include #include #include #include "dwc_otg_driver.h" #include "dwc_otg_pcd.h" /** * Static PCD pointer for use in usb_gadget_register_driver and * usb_gadget_unregister_driver. Initialized in dwc_otg_pcd_init. */ static dwc_otg_pcd_t *s_pcd = 0; /* Display the contents of the buffer */ extern void dump_msg(const u8 * buf, unsigned int length); /** * This function completes a request. It call's the request call back. */ void request_done(dwc_otg_pcd_ep_t * _ep, dwc_otg_pcd_request_t * _req, int _status) { unsigned stopped = _ep->stopped; DWC_DEBUGPL(DBG_PCDV, "%s(%p)\n", __func__, _ep); if (_req->mapped) { dma_unmap_single(_ep->pcd->gadget.dev.parent, _req->req.dma, _req->req.length, _ep->dwc_ep.is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); _req->req.dma = DMA_ADDR_INVALID; _req->mapped = 0; } else dma_sync_single_for_cpu(_ep->pcd->gadget.dev.parent, _req->req.dma, _req->req.length, _ep->dwc_ep.is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); list_del_init(&_req->queue); if (_req->req.status == -EINPROGRESS) { _req->req.status = _status; } else { _status = _req->req.status; } /* don't modify queue heads during completion callback */ _ep->stopped = 1; SPIN_UNLOCK(&_ep->pcd->lock); _req->req.complete(&_ep->ep, &_req->req); SPIN_LOCK(&_ep->pcd->lock); if (_ep->pcd->request_pending > 0) { --_ep->pcd->request_pending; } _ep->stopped = stopped; #ifdef CONFIG_405EZ /* * Added-sr: 2007-07-26 * * Finally, when the current request is done, mark this endpoint * as not active, so that new requests can be processed. */ _ep->dwc_ep.active = 0; #endif } /** * This function terminates all the requsts in the EP request queue. */ void request_nuke(dwc_otg_pcd_ep_t * _ep) { dwc_otg_pcd_request_t * req; _ep->stopped = 1; /* called with irqs blocked?? */ while (!list_empty(&_ep->queue)) { req = list_entry(_ep->queue.next, dwc_otg_pcd_request_t, queue); request_done(_ep, req, -ESHUTDOWN); } } /* USB Endpoint Operations */ /* * The following sections briefly describe the behavior of the Gadget * API endpoint operations implemented in the DWC_otg driver * software. Detailed descriptions of the generic behavior of each of * these functions can be found in the Linux header file * include/linux/usb_gadget.h. * * The Gadget API provides wrapper functions for each of the function * pointers defined in usb_ep_ops. The Gadget Driver calls the wrapper * function, which then calls the underlying PCD function. The * following sections are named according to the wrapper * functions. Within each section, the corresponding DWC_otg PCD * function name is specified. * */ /** * This function assigns periodic Tx FIFO to an periodic EP * in shared Tx FIFO mode */ static uint32_t assign_perio_tx_fifo(dwc_otg_core_if_t * core_if) { uint32_t PerTxMsk = 1; int i; for (i = 0; i < core_if->hwcfg4.b.num_dev_perio_in_ep; ++i) { if ((PerTxMsk & core_if->p_tx_msk) == 0) { core_if->p_tx_msk |= PerTxMsk; return i + 1; } PerTxMsk <<= 1; } return 0; } /** * This function releases periodic Tx FIFO * in shared Tx FIFO mode */ static void release_perio_tx_fifo(dwc_otg_core_if_t * core_if, uint32_t fifo_num) { core_if->p_tx_msk = (core_if->p_tx_msk & (1 << (fifo_num - 1))) ^ core_if->p_tx_msk; } /** * This function assigns periodic Tx FIFO to an periodic EP * in shared Tx FIFO mode */ static uint32_t assign_tx_fifo(dwc_otg_core_if_t * core_if) { uint32_t TxMsk = 1; int i; for (i = 0; i < core_if->hwcfg4.b.num_in_eps; ++i) { if ((TxMsk & core_if->tx_msk) == 0) { core_if->tx_msk |= TxMsk; return i + 1; } TxMsk <<= 1; } return 0; } /** * This function releases periodic Tx FIFO * in shared Tx FIFO mode */ static void release_tx_fifo(dwc_otg_core_if_t * core_if, uint32_t fifo_num) { core_if->tx_msk = (core_if->tx_msk & (1 << (fifo_num - 1))) ^ core_if->tx_msk; } /** * This function is called by the Gadget Driver for each EP to be * configured for the current configuration (SET_CONFIGURATION). * * This function initializes the dwc_otg_ep_t data structure, and then * calls dwc_otg_ep_activate. */ static int dwc_otg_pcd_ep_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *_desc) { dwc_otg_pcd_ep_t * ep = 0; dwc_otg_pcd_t * pcd = 0; unsigned long flags; DWC_DEBUGPL(DBG_PCDV, "%s(%p,%p)\n", __func__, _ep, _desc); ep = container_of(_ep, dwc_otg_pcd_ep_t, ep); if (!_ep || !_desc || ep->desc || _desc->bDescriptorType != USB_DT_ENDPOINT) { DWC_WARN("%s, bad ep or descriptor\n", __func__); return -EINVAL; } if (ep == &ep->pcd->ep0) { DWC_WARN("%s, bad ep(0)\n", __func__); return -EINVAL; } /* Check FIFO size? */ if (!_desc->wMaxPacketSize) { DWC_WARN("%s, bad %s maxpacket\n", __func__, _ep->name); return -ERANGE; } pcd = ep->pcd; if (!pcd->driver || pcd->gadget.speed == USB_SPEED_UNKNOWN) { DWC_WARN("%s, bogus device state\n", __func__); return -ESHUTDOWN; } SPIN_LOCK_IRQSAVE(&pcd->lock, flags); ep->desc = _desc; ep->ep.maxpacket = le16_to_cpu(_desc->wMaxPacketSize); /* * Activate the EP */ ep->stopped = 0; ep->dwc_ep.is_in = (USB_DIR_IN & _desc->bEndpointAddress) != 0; ep->dwc_ep.maxpacket = ep->ep.maxpacket; ep->dwc_ep.type = _desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK; if (ep->dwc_ep.is_in) { if (!pcd->otg_dev->core_if->en_multiple_tx_fifo) { ep->dwc_ep.tx_fifo_num = 0; if ((_desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_ISOC) { /* * if ISOC EP then assign a Periodic Tx FIFO. */ ep->dwc_ep.tx_fifo_num = assign_perio_tx_fifo(pcd->otg_dev->core_if); } } else { /* * if Dedicated FIFOs mode is on then assign a Tx FIFO. */ ep->dwc_ep.tx_fifo_num = assign_tx_fifo(pcd->otg_dev->core_if); } } /* Set initial data PID. */ if ((_desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_BULK) { ep->dwc_ep.data_pid_start = 0; } DWC_DEBUGPL(DBG_PCD, "Activate %s-%s: type=%d, mps=%d desc=%p\n", ep->ep.name, (ep->dwc_ep.is_in ? "IN" : "OUT"), ep->dwc_ep.type, ep->dwc_ep.maxpacket, ep->desc); dwc_otg_ep_activate(GET_CORE_IF(pcd), &ep->dwc_ep); SPIN_UNLOCK_IRQRESTORE(&pcd->lock, flags); return 0; } /** * This function is called when an EP is disabled due to disconnect or * change in configuration. Any pending requests will terminate with a * status of -ESHUTDOWN. * * This function modifies the dwc_otg_ep_t data structure for this EP, * and then calls dwc_otg_ep_deactivate. */ static int dwc_otg_pcd_ep_disable(struct usb_ep *_ep) { dwc_otg_pcd_ep_t * ep; unsigned long flags; DWC_DEBUGPL(DBG_PCDV, "%s(%p)\n", __func__, _ep); ep = container_of(_ep, dwc_otg_pcd_ep_t, ep); if (!_ep || !ep->desc) { DWC_DEBUGPL(DBG_PCD, "%s, %s not enabled\n", __func__, _ep ? ep->ep.name : NULL); return -EINVAL; } SPIN_LOCK_IRQSAVE(&ep->pcd->lock, flags); request_nuke(ep); dwc_otg_ep_deactivate(GET_CORE_IF(ep->pcd), &ep->dwc_ep); ep->desc = 0; ep->stopped = 1; if (ep->dwc_ep.is_in) { release_perio_tx_fifo(GET_CORE_IF(ep->pcd),ep->dwc_ep.tx_fifo_num); release_tx_fifo(GET_CORE_IF(ep->pcd), ep->dwc_ep.tx_fifo_num); } SPIN_UNLOCK_IRQRESTORE(&ep->pcd->lock, flags); DWC_DEBUGPL(DBG_PCD, "%s disabled\n", _ep->name); return 0; } /** * This function allocates a request object to use with the specified * endpoint. * * @param _ep The endpoint to be used with with the request * @param _gfp_flags the GFP_* flags to use. */ static struct usb_request *dwc_otg_pcd_alloc_request(struct usb_ep *_ep, gfp_t _gfp_flags) { dwc_otg_pcd_request_t * req; DWC_DEBUGPL(DBG_PCDV, "%s(%p,%d)\n", __func__, _ep, _gfp_flags); if (0 == _ep) { DWC_WARN("%s() %s\n", __func__, "Invalid EP!\n"); return 0; } req = kmalloc(sizeof(dwc_otg_pcd_request_t), _gfp_flags); if (0 == req) { DWC_WARN("%s() %s\n", __func__,"request allocation failed!\n"); return 0; } memset(req, 0, sizeof(dwc_otg_pcd_request_t)); req->req.dma = DMA_ADDR_INVALID; INIT_LIST_HEAD(&req->queue); return &req->req; } /** * This function frees a request object. * * @param _ep The endpoint associated with the request * @param _req The request being freed */ static void dwc_otg_pcd_free_request(struct usb_ep *_ep, struct usb_request *_req) { dwc_otg_pcd_request_t * req; DWC_DEBUGPL(DBG_PCDV, "%s(%p,%p)\n", __func__, _ep, _req); if (0 == _ep || 0 == _req) { DWC_WARN("%s() %s\n", __func__,"Invalid ep or req argument!\n"); return; } req = container_of(_req, dwc_otg_pcd_request_t, req); kfree(req); } /** * This function is used to submit an I/O Request to an EP. * * - When the request completes the request's completion callback * is called to return the request to the driver. * - An EP, except control EPs, may have multiple requests * pending. * - Once submitted the request cannot be examined or modified. * - Each request is turned into one or more packets. * - A BULK EP can queue any amount of data; the transfer is * packetized. * - Zero length Packets are specified with the request 'zero' * flag. */ static int dwc_otg_pcd_ep_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t _gfp_flags) { int prevented = 0; dwc_otg_pcd_request_t * req; dwc_otg_pcd_ep_t * ep; dwc_otg_pcd_t * pcd; unsigned long flags = 0; DWC_DEBUGPL(DBG_PCDV, "%s(%p,%p,%d)\n", __func__, _ep, _req, _gfp_flags); req = container_of(_req, dwc_otg_pcd_request_t, req); if (!_req || !_req->complete || !_req->buf || !list_empty(&req->queue)) { DWC_WARN("%s, bad params\n", __func__); return -EINVAL; } ep = container_of(_ep, dwc_otg_pcd_ep_t, ep); if (!_ep || (!ep->desc && ep->dwc_ep.num != 0)) { DWC_WARN("%s, bad ep\n", __func__); return -EINVAL; } pcd = ep->pcd; if (!pcd->driver || pcd->gadget.speed == USB_SPEED_UNKNOWN) { DWC_DEBUGPL(DBG_PCDV, "gadget.speed=%d\n", pcd->gadget.speed); DWC_WARN("%s, bogus device state\n", __func__); return -ESHUTDOWN; } DWC_DEBUGPL(DBG_PCD, "%s queue req %p, len %d buf %p\n", _ep->name, _req, _req->length, _req->buf); if (!GET_CORE_IF(pcd)->core_params->opt) { if (ep->dwc_ep.num != 0) { DWC_ERROR("%s queue req %p, len %d buf %p\n", _ep->name, _req, _req->length, _req->buf); } } SPIN_LOCK_IRQSAVE(&ep->pcd->lock, flags); #if defined(CONFIG_DWC_DEBUG) & defined(VERBOSE) dump_msg(_req->buf, _req->length); #endif /* */ _req->status = -EINPROGRESS; _req->actual = 0; /* * For EP0 IN without premature status, zlp is required? */ if (ep->dwc_ep.num == 0 && ep->dwc_ep.is_in) { DWC_DEBUGPL(DBG_PCDV, "%s-OUT ZLP\n", _ep->name); //_req->zero = 1; } /* map virtual address to hardware */ if (_req->dma == DMA_ADDR_INVALID) { _req->dma = dma_map_single(ep->pcd->gadget.dev.parent, _req->buf, _req->length, ep->dwc_ep.is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); req->mapped = 1; } else { dma_sync_single_for_device(ep->pcd->gadget.dev.parent, _req->dma, _req->length, ep->dwc_ep.is_in ? DMA_TO_DEVICE : DMA_FROM_DEVICE); req->mapped = 0; } /* Start the transfer */ if (list_empty(&ep->queue) && !ep->stopped) { /* EP0 Transfer? */ if (ep->dwc_ep.num == 0) { switch (pcd->ep0state) { case EP0_IN_DATA_PHASE: DWC_DEBUGPL(DBG_PCD, "%s ep0: EP0_IN_DATA_PHASE\n", __func__); break; case EP0_OUT_DATA_PHASE: DWC_DEBUGPL(DBG_PCD, "%s ep0: EP0_OUT_DATA_PHASE\n", __func__); if (pcd->request_config) { /* Complete STATUS PHASE */ ep->dwc_ep.is_in = 1; pcd->ep0state = EP0_STATUS; } break; default: DWC_DEBUGPL(DBG_ANY, "ep0: odd state %d\n", pcd->ep0state); SPIN_UNLOCK_IRQRESTORE(&pcd->lock, flags); return -EL2HLT; } ep->dwc_ep.dma_addr = _req->dma; ep->dwc_ep.start_xfer_buff = _req->buf; ep->dwc_ep.xfer_buff = _req->buf; ep->dwc_ep.xfer_len = _req->length; ep->dwc_ep.xfer_count = 0; ep->dwc_ep.sent_zlp = 0; ep->dwc_ep.total_len = ep->dwc_ep.xfer_len; dwc_otg_ep0_start_transfer(GET_CORE_IF(pcd), &ep->dwc_ep); } else { /* Setup and start the Transfer */ ep->dwc_ep.dma_addr = _req->dma; ep->dwc_ep.start_xfer_buff = _req->buf; ep->dwc_ep.xfer_buff = _req->buf; ep->dwc_ep.xfer_len = _req->length; ep->dwc_ep.xfer_count = 0; ep->dwc_ep.sent_zlp = 0; ep->dwc_ep.total_len = ep->dwc_ep.xfer_len; dwc_otg_ep_start_transfer(GET_CORE_IF(pcd), &ep->dwc_ep); } } if ((req != 0) || prevented) { ++pcd->request_pending; list_add_tail(&req->queue, &ep->queue); if (ep->dwc_ep.is_in && ep->stopped && !(GET_CORE_IF(pcd)->dma_enable)) { /** @todo NGS Create a function for this. */ diepmsk_data_t diepmsk = {.d32 = 0}; diepmsk.b.intktxfemp = 1; dwc_modify_reg32(&GET_CORE_IF(pcd)->dev_if->dev_global_regs->diepmsk, 0, diepmsk.d32); } } SPIN_UNLOCK_IRQRESTORE(&pcd->lock, flags); return 0; } /** * This function cancels an I/O request from an EP. */ static int dwc_otg_pcd_ep_dequeue(struct usb_ep *_ep, struct usb_request *_req) { dwc_otg_pcd_request_t * req; dwc_otg_pcd_ep_t * ep; dwc_otg_pcd_t * pcd; unsigned long flags; DWC_DEBUGPL(DBG_PCDV, "%s(%p,%p)\n", __func__, _ep, _req); ep = container_of(_ep, dwc_otg_pcd_ep_t, ep); if (!_ep || !_req || (!ep->desc && ep->dwc_ep.num != 0)) { DWC_WARN("%s, bad argument\n", __func__); return -EINVAL; } pcd = ep->pcd; if (!pcd->driver || pcd->gadget.speed == USB_SPEED_UNKNOWN) { DWC_WARN("%s, bogus device state\n", __func__); return -ESHUTDOWN; } SPIN_LOCK_IRQSAVE(&pcd->lock, flags); DWC_DEBUGPL(DBG_PCDV, "%s %s %s %p\n", __func__, _ep->name, ep->dwc_ep.is_in ? "IN" : "OUT", _req); /* make sure it's actually queued on this endpoint */ list_for_each_entry(req, &ep->queue, queue) { if (&req->req == _req) { break; } } if (&req->req != _req) { SPIN_UNLOCK_IRQRESTORE(&pcd->lock, flags); return -EINVAL; } if (!list_empty(&req->queue)) { request_done(ep, req, -ECONNRESET); } else { req = 0; } SPIN_UNLOCK_IRQRESTORE(&pcd->lock, flags); return req ? 0 : -EOPNOTSUPP; } /** * usb_ep_set_halt stalls an endpoint. * * usb_ep_clear_halt clears an endpoint halt and resets its data * toggle. * * Both of these functions are implemented with the same underlying * function. The behavior depends on the value argument. * * @param[in] _ep the Endpoint to halt or clear halt. * @param[in] _value * - 0 means clear_halt. * - 1 means set_halt, * - 2 means clear stall lock flag. * - 3 means set stall lock flag. */ static int dwc_otg_pcd_ep_set_halt(struct usb_ep *_ep, int _value) { int retval = 0; unsigned long flags; dwc_otg_pcd_ep_t * ep = 0; DWC_DEBUGPL(DBG_PCD, "HALT %s %d\n", _ep->name, _value); ep = container_of(_ep, dwc_otg_pcd_ep_t, ep); if (!_ep || (!ep->desc && ep != &ep->pcd->ep0) || ep->desc->bmAttributes == USB_ENDPOINT_XFER_ISOC) { DWC_WARN("%s, bad ep\n", __func__); return -EINVAL; } SPIN_LOCK_IRQSAVE(&ep->pcd->lock, flags); if (ep->dwc_ep.is_in && !list_empty(&ep->queue)) { DWC_WARN("%s() %s XFer In process\n", __func__, _ep->name); retval = -EAGAIN; } else if (_value == 0) { dwc_otg_ep_clear_stall(ep->pcd->otg_dev->core_if,&ep->dwc_ep); } else if (_value == 1) { if (ep->dwc_ep.num == 0) { ep->pcd->ep0state = EP0_STALL; } ep->stopped = 1; dwc_otg_ep_set_stall(ep->pcd->otg_dev->core_if, &ep->dwc_ep); } else if (_value == 2) { ep->dwc_ep.stall_clear_flag = 0; } else if (_value == 3) { ep->dwc_ep.stall_clear_flag = 1; } SPIN_UNLOCK_IRQRESTORE(&ep->pcd->lock, flags); return retval; } static struct usb_ep_ops dwc_otg_pcd_ep_ops = { .enable = dwc_otg_pcd_ep_enable, .disable = dwc_otg_pcd_ep_disable, .alloc_request = dwc_otg_pcd_alloc_request, .free_request = dwc_otg_pcd_free_request, .queue = dwc_otg_pcd_ep_queue, .dequeue = dwc_otg_pcd_ep_dequeue, .set_halt = dwc_otg_pcd_ep_set_halt, .fifo_status = 0, .fifo_flush = 0, }; /* Gadget Operations */ /** * The following gadget operations will be implemented in the DWC_otg * PCD. Functions in the API that are not described below are not * implemented. * * The Gadget API provides wrapper functions for each of the function * pointers defined in usb_gadget_ops. The Gadget Driver calls the * wrapper function, which then calls the underlying PCD function. The * following sections are named according to the wrapper functions * (except for ioctl, which doesn't have a wrapper function). Within * each section, the corresponding DWC_otg PCD function name is * specified. * */ /** *Gets the USB Frame number of the last SOF. */ static int dwc_otg_pcd_get_frame(struct usb_gadget *_gadget) { dwc_otg_pcd_t * pcd; DWC_DEBUGPL(DBG_PCDV, "%s(%p)\n", __func__, _gadget); if (_gadget == 0) { return -ENODEV; } else { pcd = container_of(_gadget, dwc_otg_pcd_t, gadget); dwc_otg_get_frame_number(GET_CORE_IF(pcd)); } return 0; } void dwc_otg_pcd_initiate_srp(dwc_otg_pcd_t * _pcd) { uint32_t * addr = (uint32_t *) &(GET_CORE_IF(_pcd)->core_global_regs->gotgctl); gotgctl_data_t mem; gotgctl_data_t val; val.d32 = dwc_read_reg32(addr); if (val.b.sesreq) { DWC_ERROR("Session Request Already active!\n"); return; } DWC_NOTICE("Session Request Initated\n"); mem.d32 = dwc_read_reg32(addr); mem.b.sesreq = 1; dwc_write_reg32(addr, mem.d32); /* Start the SRP timer */ dwc_otg_pcd_start_srp_timer(_pcd); return; } void dwc_otg_pcd_remote_wakeup(dwc_otg_pcd_t * _pcd, int set) { dctl_data_t dctl = {.d32 = 0}; volatile uint32_t *addr = &(GET_CORE_IF(_pcd)->dev_if->dev_global_regs->dctl); if (dwc_otg_is_device_mode(GET_CORE_IF(_pcd))) { if (_pcd->remote_wakeup_enable) { if (set) { dctl.b.rmtwkupsig = 1; dwc_modify_reg32(addr, 0, dctl.d32); DWC_DEBUGPL(DBG_PCD, "Set Remote Wakeup\n"); mdelay(1); dwc_modify_reg32(addr, dctl.d32, 0); DWC_DEBUGPL(DBG_PCD, "Clear Remote Wakeup\n"); } else { } } else { DWC_DEBUGPL(DBG_PCD, "Remote Wakeup is disabled\n"); } } return; } /** * Initiates Session Request Protocol (SRP) to wakeup the host if no * session is in progress. If a session is already in progress, but * the device is suspended, remote wakeup signaling is started. * */ static int dwc_otg_pcd_wakeup(struct usb_gadget *_gadget) { unsigned long flags; dwc_otg_pcd_t * pcd; dsts_data_t dsts; gotgctl_data_t gotgctl; DWC_DEBUGPL(DBG_PCDV, "%s(%p)\n", __func__, _gadget); if (_gadget == 0) { return -ENODEV; } else { pcd = container_of(_gadget, dwc_otg_pcd_t, gadget); } SPIN_LOCK_IRQSAVE(&pcd->lock, flags); /* * This function starts the Protocol if no session is in progress. If * a session is already in progress, but the device is suspended, * remote wakeup signaling is started. */ /* Check if valid session */ gotgctl.d32 = dwc_read_reg32(&(GET_CORE_IF(pcd)->core_global_regs->gotgctl)); if (gotgctl.b.bsesvld) { /* Check if suspend state */ dsts.d32 = dwc_read_reg32(&(GET_CORE_IF(pcd)->dev_if->dev_global_regs->dsts)); if (dsts.b.suspsts) { dwc_otg_pcd_remote_wakeup(pcd, 1); } } else { dwc_otg_pcd_initiate_srp(pcd); } SPIN_UNLOCK_IRQRESTORE(&pcd->lock, flags); return 0; } static const struct usb_gadget_ops dwc_otg_pcd_ops = { .get_frame = dwc_otg_pcd_get_frame, .wakeup = dwc_otg_pcd_wakeup, // current versions must always be self-powered }; /** * This function updates the otg values in the gadget structure. */ void dwc_otg_pcd_update_otg(dwc_otg_pcd_t * _pcd, const unsigned _reset) { if (!_pcd->gadget.is_otg) return; if (_reset) { _pcd->b_hnp_enable = 0; _pcd->a_hnp_support = 0; _pcd->a_alt_hnp_support = 0; } _pcd->gadget.b_hnp_enable = _pcd->b_hnp_enable; _pcd->gadget.a_hnp_support = _pcd->a_hnp_support; _pcd->gadget.a_alt_hnp_support = _pcd->a_alt_hnp_support; } /** * This function is the top level PCD interrupt handler. */ static irqreturn_t dwc_otg_pcd_irq(int _irq, void *_dev) { dwc_otg_pcd_t * pcd = _dev; int32_t retval = IRQ_NONE; retval = dwc_otg_pcd_handle_intr(pcd); return IRQ_RETVAL(retval); } /** * PCD Callback function for initializing the PCD when switching to * device mode. * * @param _p void pointer to the dwc_otg_pcd_t */ static int32_t dwc_otg_pcd_start_cb(void *_p) { dwc_otg_pcd_t * pcd = (dwc_otg_pcd_t *) _p; /* * Initialized the Core for Device mode. */ if (dwc_otg_is_device_mode(GET_CORE_IF(pcd))) { dwc_otg_core_dev_init(GET_CORE_IF(pcd)); } return 1; } /** * PCD Callback function for stopping the PCD when switching to Host * mode. * * @param _p void pointer to the dwc_otg_pcd_t */ static int32_t dwc_otg_pcd_stop_cb(void *_p) { dwc_otg_pcd_t * pcd = (dwc_otg_pcd_t *) _p; extern void dwc_otg_pcd_stop(dwc_otg_pcd_t * _pcd); dwc_otg_pcd_stop(pcd); return 1; } /** * PCD Callback function for notifying the PCD when resuming from * suspend. * * @param _p void pointer to the dwc_otg_pcd_t */ static int32_t dwc_otg_pcd_suspend_cb(void *_p) { dwc_otg_pcd_t * pcd = (dwc_otg_pcd_t *) _p; if (pcd->driver && pcd->driver->resume) { SPIN_UNLOCK(&pcd->lock); pcd->driver->suspend(&pcd->gadget); SPIN_LOCK(&pcd->lock); } return 1; } /** * PCD Callback function for notifying the PCD when resuming from * suspend. * * @param _p void pointer to the dwc_otg_pcd_t */ static int32_t dwc_otg_pcd_resume_cb(void *_p) { dwc_otg_pcd_t * pcd = (dwc_otg_pcd_t *) _p; if (pcd->driver && pcd->driver->resume) { SPIN_UNLOCK(&pcd->lock); pcd->driver->resume(&pcd->gadget); SPIN_LOCK(&pcd->lock); } /* Stop the SRP timeout timer. */ if ((GET_CORE_IF(pcd)->core_params->phy_type != DWC_PHY_TYPE_PARAM_FS) || (!GET_CORE_IF(pcd)->core_params->i2c_enable)) { if (GET_CORE_IF(pcd)->srp_timer_started) { GET_CORE_IF(pcd)->srp_timer_started = 0; del_timer(&pcd->srp_timer); } } return 1; } /** * PCD Callback structure for handling mode switching. */ static dwc_otg_cil_callbacks_t pcd_callbacks = { .start = dwc_otg_pcd_start_cb, .stop = dwc_otg_pcd_stop_cb, .suspend = dwc_otg_pcd_suspend_cb, .resume_wakeup = dwc_otg_pcd_resume_cb, .p = 0, /* Set at registration */ }; /** * This function is called when the SRP timer expires. The SRP should * complete within 6 seconds. */ static void srp_timeout(unsigned long _ptr) { gotgctl_data_t gotgctl; dwc_otg_core_if_t * core_if = (dwc_otg_core_if_t *) _ptr; volatile uint32_t *addr = &core_if->core_global_regs->gotgctl; gotgctl.d32 = dwc_read_reg32(addr); core_if->srp_timer_started = 0; if ((core_if->core_params->phy_type == DWC_PHY_TYPE_PARAM_FS) && (core_if->core_params->i2c_enable)) { DWC_PRINT("SRP Timeout\n"); if ((core_if->srp_success) && (gotgctl.b.bsesvld)) { if (core_if->pcd_cb && core_if->pcd_cb->resume_wakeup) { core_if->pcd_cb->resume_wakeup(core_if-> pcd_cb->p); } /* Clear Session Request */ gotgctl.d32 = 0; gotgctl.b.sesreq = 1; dwc_modify_reg32(&core_if->core_global_regs->gotgctl,gotgctl.d32, 0); core_if->srp_success = 0; } else { DWC_ERROR("Device not connected/responding\n"); gotgctl.b.sesreq = 0; dwc_write_reg32(addr, gotgctl.d32); } } else if (gotgctl.b.sesreq) { DWC_PRINT("SRP Timeout\n"); DWC_ERROR("Device not connected/responding\n"); gotgctl.b.sesreq = 0; dwc_write_reg32(addr, gotgctl.d32); } else { DWC_PRINT(" SRP GOTGCTL=%0x\n", gotgctl.d32); } } /** * Start the SRP timer to detect when the SRP does not complete within * 6 seconds. * * @param _pcd the pcd structure. */ void dwc_otg_pcd_start_srp_timer(dwc_otg_pcd_t * _pcd) { struct timer_list *srp_timer = &_pcd->srp_timer; GET_CORE_IF(_pcd)->srp_timer_started = 1; init_timer(srp_timer); srp_timer->function = srp_timeout; srp_timer->data = (unsigned long)GET_CORE_IF(_pcd); srp_timer->expires = jiffies + (HZ * 6); add_timer(srp_timer); } /** * Tasklet * */ extern void start_next_request(dwc_otg_pcd_ep_t * _ep); static void start_xfer_tasklet_func(unsigned long data) { dwc_otg_pcd_t * pcd = (dwc_otg_pcd_t *) data; dwc_otg_core_if_t * core_if = pcd->otg_dev->core_if; int i; depctl_data_t diepctl; DWC_DEBUGPL(DBG_PCDV, "Start xfer tasklet\n"); diepctl.d32 = dwc_read_reg32(&core_if->dev_if->in_ep_regs[0]->diepctl); if (pcd->ep0.queue_sof) { pcd->ep0.queue_sof = 0; start_next_request(&pcd->ep0); // break; } for (i = 0; i < core_if->dev_if->num_in_eps; i++) { depctl_data_t diepctl; diepctl.d32 = dwc_read_reg32(&core_if->dev_if->in_ep_regs[i]->diepctl); if (pcd->in_ep[i].queue_sof) { pcd->in_ep[i].queue_sof = 0; start_next_request(&pcd->in_ep[i]); // break; } } return; } static struct tasklet_struct start_xfer_tasklet = { .next = NULL, .state = 0, .count = ATOMIC_INIT(0), .func = start_xfer_tasklet_func, .data = 0, }; /** * This function initialized the pcd Dp structures to there default * state. * * @param _pcd the pcd structure. */ void dwc_otg_pcd_reinit(dwc_otg_pcd_t * _pcd) { static const char *names[] = { "ep0", "ep1in", "ep2in", "ep3in", "ep4in", "ep5in", "ep6in", "ep7in", "ep8in", "ep9in", "ep10in", "ep11in", "ep12in", "ep13in", "ep14in", "ep15in", "ep1out", "ep2out", "ep3out", "ep4out", "ep5out", "ep6out", "ep7out", "ep8out", "ep9out", "ep10out", "ep11out", "ep12out", "ep13out", "ep14out", "ep15out" }; int i; int in_ep_cntr, out_ep_cntr; uint32_t hwcfg1; uint32_t num_in_eps = (GET_CORE_IF(_pcd))->dev_if->num_in_eps; uint32_t num_out_eps = (GET_CORE_IF(_pcd))->dev_if->num_out_eps; dwc_otg_pcd_ep_t * ep; DWC_DEBUGPL(DBG_PCDV, "%s(%p)\n", __func__, _pcd); INIT_LIST_HEAD(&_pcd->gadget.ep_list); _pcd->gadget.ep0 = &_pcd->ep0.ep; _pcd->gadget.speed = USB_SPEED_UNKNOWN; INIT_LIST_HEAD(&_pcd->gadget.ep0->ep_list); /** * Initialize the EP0 structure. */ ep = &_pcd->ep0; /* Init EP structure */ ep->desc = 0; ep->pcd = _pcd; ep->stopped = 1; /* Init DWC ep structure */ ep->dwc_ep.num = 0; ep->dwc_ep.active = 0; ep->dwc_ep.tx_fifo_num = 0; /* Control until ep is actvated */ ep->dwc_ep.type = DWC_OTG_EP_TYPE_CONTROL; ep->dwc_ep.maxpacket = MAX_PACKET_SIZE; ep->dwc_ep.dma_addr = 0; ep->dwc_ep.start_xfer_buff = 0; ep->dwc_ep.xfer_buff = 0; ep->dwc_ep.xfer_len = 0; ep->dwc_ep.xfer_count = 0; ep->dwc_ep.sent_zlp = 0; ep->dwc_ep.total_len = 0; ep->queue_sof = 0; /* Init the usb_ep structure. */ ep->ep.name = names[0]; ep->ep.ops = &dwc_otg_pcd_ep_ops; /** * @todo NGS: What should the max packet size be set to * here? Before EP type is set? */ ep->ep.maxpacket = MAX_PACKET_SIZE; list_add_tail(&ep->ep.ep_list, &_pcd->gadget.ep_list); INIT_LIST_HEAD(&ep->queue); /** * Initialize the EP structures. */ in_ep_cntr = 0; hwcfg1 = (GET_CORE_IF(_pcd))->hwcfg1.d32 >> 3; for (i = 1; in_ep_cntr < num_in_eps; i++) { if ((hwcfg1 & 0x1) == 0) { dwc_otg_pcd_ep_t * ep = &_pcd->in_ep[in_ep_cntr]; in_ep_cntr++; /* Init EP structure */ ep->desc = 0; ep->pcd = _pcd; ep->stopped = 1; /* Init DWC ep structure */ ep->dwc_ep.is_in = 1; ep->dwc_ep.num = i; ep->dwc_ep.active = 0; ep->dwc_ep.tx_fifo_num = 0; /* Control until ep is actvated */ ep->dwc_ep.type = DWC_OTG_EP_TYPE_CONTROL; ep->dwc_ep.maxpacket = MAX_PACKET_SIZE; ep->dwc_ep.dma_addr = 0; ep->dwc_ep.start_xfer_buff = 0; ep->dwc_ep.xfer_buff = 0; ep->dwc_ep.xfer_len = 0; ep->dwc_ep.xfer_count = 0; ep->dwc_ep.sent_zlp = 0; ep->dwc_ep.total_len = 0; ep->queue_sof = 0; /* Init the usb_ep structure. */ /** * @todo NGS: Add direction to EP, based on contents * of HWCFG1. Need a copy of HWCFG1 in pcd structure? * sprintf( ";r */ ep->ep.name = names[i]; ep->ep.ops = &dwc_otg_pcd_ep_ops; /** * @todo NGS: What should the max packet size be set to * here? Before EP type is set? */ ep->ep.maxpacket = MAX_PACKET_SIZE; list_add_tail(&ep->ep.ep_list, &_pcd->gadget.ep_list); INIT_LIST_HEAD(&ep->queue); } hwcfg1 >>= 2; } out_ep_cntr = 0; hwcfg1 = (GET_CORE_IF(_pcd))->hwcfg1.d32 >> 2; for (i = 1; out_ep_cntr < num_out_eps; i++) { if ((hwcfg1 & 0x1) == 0) { dwc_otg_pcd_ep_t * ep = &_pcd->out_ep[out_ep_cntr]; out_ep_cntr++; /* Init EP structure */ ep->desc = 0; ep->pcd = _pcd; ep->stopped = 1; /* Init DWC ep structure */ ep->dwc_ep.is_in = 0; ep->dwc_ep.num = i; ep->dwc_ep.active = 0; ep->dwc_ep.tx_fifo_num = 0; /* Control until ep is actvated */ ep->dwc_ep.type = DWC_OTG_EP_TYPE_CONTROL; ep->dwc_ep.maxpacket = MAX_PACKET_SIZE; ep->dwc_ep.dma_addr = 0; ep->dwc_ep.start_xfer_buff = 0; ep->dwc_ep.xfer_buff = 0; ep->dwc_ep.xfer_len = 0; ep->dwc_ep.xfer_count = 0; ep->dwc_ep.sent_zlp = 0; ep->dwc_ep.total_len = 0; ep->queue_sof = 0; /* Init the usb_ep structure. */ /** * @todo NGS: Add direction to EP, based on contents * of HWCFG1. Need a copy of HWCFG1 in pcd structure? * sprintf( ";r */ ep->ep.name = names[15 + i]; ep->ep.ops = &dwc_otg_pcd_ep_ops; /** * @todo NGS: What should the max packet size be set to * here? Before EP type is set? */ ep->ep.maxpacket = MAX_PACKET_SIZE; list_add_tail(&ep->ep.ep_list, &_pcd->gadget.ep_list); INIT_LIST_HEAD(&ep->queue); } hwcfg1 >>= 2; } /* remove ep0 from the list. There is a ep0 pointer. */ list_del_init(&_pcd->ep0.ep.ep_list); _pcd->ep0state = EP0_DISCONNECT; _pcd->ep0.ep.maxpacket = MAX_EP0_SIZE; _pcd->ep0.dwc_ep.maxpacket = MAX_EP0_SIZE; _pcd->ep0.dwc_ep.type = DWC_OTG_EP_TYPE_CONTROL; } /** * This function releases the Gadget device. * required by device_unregister(). * * @todo Should this do something? Should it free the PCD? */ static void dwc_otg_pcd_gadget_release(struct device *_dev) { DWC_DEBUGPL(DBG_PCDV, "%s(%p)\n", __func__, _dev); } /** * This function initialized the PCD portion of the driver. * */ int __init dwc_otg_pcd_init(struct device *_dev) { static char pcd_name[] = "dwc_otg_pcd"; dwc_otg_pcd_t * pcd; dwc_otg_device_t * otg_dev = dev_get_drvdata(_dev); int retval = 0; DWC_DEBUGPL(DBG_PCDV, "%s(%p)\n", __func__, _dev); /* * Allocate PCD structure */ pcd = kmalloc(sizeof(dwc_otg_pcd_t), GFP_KERNEL); if (pcd == 0) { return -ENOMEM; } memset(pcd, 0, sizeof(dwc_otg_pcd_t)); spin_lock_init(&pcd->lock); otg_dev->pcd = pcd; s_pcd = pcd; pcd->gadget.name = pcd_name; dev_set_name(&pcd->gadget.dev, "gadget"); pcd->otg_dev = dev_get_drvdata(_dev); pcd->gadget.dev.parent = _dev; pcd->gadget.dev.release = dwc_otg_pcd_gadget_release; pcd->gadget.ops = &dwc_otg_pcd_ops; if (GET_CORE_IF(pcd)->hwcfg4.b.ded_fifo_en) { DWC_PRINT("Dedicated Tx FIFOs mode\n"); } else { DWC_PRINT("Shared Tx FIFO mode\n"); } /* If the module is set to FS or if the PHY_TYPE is FS then the gadget * should not report as dual-speed capable. replace the following line * with the block of code below it once the software is debugged for * this. If is_dualspeed = 0 then the gadget driver should not report * a device qualifier descriptor when queried. */ if ((GET_CORE_IF(pcd)->core_params->speed == DWC_SPEED_PARAM_FULL) || ((GET_CORE_IF(pcd)->hwcfg2.b.hs_phy_type == 2) && (GET_CORE_IF(pcd)->hwcfg2.b.fs_phy_type == 1) && (GET_CORE_IF(pcd)->core_params->ulpi_fs_ls))) { pcd->gadget.is_dualspeed = 0; } else { pcd->gadget.is_dualspeed = 1; } if ((otg_dev->core_if->hwcfg2.b.op_mode == DWC_HWCFG2_OP_MODE_NO_SRP_CAPABLE_DEVICE) || (otg_dev->core_if->hwcfg2.b.op_mode == DWC_HWCFG2_OP_MODE_NO_SRP_CAPABLE_HOST) || (otg_dev->core_if->hwcfg2.b.op_mode == DWC_HWCFG2_OP_MODE_SRP_CAPABLE_DEVICE) || (otg_dev->core_if->hwcfg2.b.op_mode == DWC_HWCFG2_OP_MODE_SRP_CAPABLE_HOST)) { pcd->gadget.is_otg = 0; } else { pcd->gadget.is_otg = 1; } pcd->driver = 0; /* Register the gadget device */ retval = device_register(&pcd->gadget.dev); /* * Initialized the Core for Device mode. */ if (dwc_otg_is_device_mode(GET_CORE_IF(pcd))) { dwc_otg_core_dev_init(GET_CORE_IF(pcd)); } /* * Initialize EP structures */ dwc_otg_pcd_reinit(pcd); /* * Register the PCD Callbacks. */ dwc_otg_cil_register_pcd_callbacks(otg_dev->core_if, &pcd_callbacks,pcd); /* * Setup interupt handler */ DWC_DEBUGPL(DBG_ANY, "registering handler for irq%d\n",otg_dev->irq); retval = request_irq(otg_dev->irq, dwc_otg_pcd_irq, IRQF_SHARED, pcd->gadget.name, pcd); if (retval != 0) { DWC_ERROR("request of irq%d failed\n", otg_dev->irq); kfree(pcd); return -EBUSY; } /* * Initialize the DMA buffer for SETUP packets */ if (GET_CORE_IF(pcd)->dma_enable) { pcd->setup_pkt = dma_alloc_coherent(_dev, sizeof(*pcd->setup_pkt) * 5, &pcd->setup_pkt_dma_handle, 0); pcd->status_buf = dma_alloc_coherent(_dev, sizeof(uint16_t), &pcd->status_buf_dma_handle, 0); } else { pcd->setup_pkt = kmalloc(sizeof(*pcd->setup_pkt) * 5, GFP_KERNEL); pcd->status_buf = kmalloc(sizeof(uint16_t), GFP_KERNEL); } if (pcd->setup_pkt == 0) { kfree(pcd); return -ENOMEM; } /* Initialize tasklet */ start_xfer_tasklet.data = (unsigned long)pcd; pcd->start_xfer_tasklet = &start_xfer_tasklet; return 0; } /** * Cleanup the PCD. */ void dwc_otg_pcd_remove(struct device *_dev) { dwc_otg_device_t * otg_dev = dev_get_drvdata(_dev); dwc_otg_pcd_t * pcd = otg_dev->pcd; DWC_DEBUGPL(DBG_PCDV, "%s(%p)\n", __func__, _dev); /* * Free the IRQ */ free_irq(otg_dev->irq, pcd); /* start with the driver above us */ if (pcd->driver) { /* should have been done already by driver model core */ DWC_WARN("driver '%s' is still registered\n",pcd->driver->driver.name); usb_gadget_unregister_driver(pcd->driver); } device_unregister(&pcd->gadget.dev); if (GET_CORE_IF(pcd)->dma_enable) { dma_free_coherent(NULL, sizeof(*pcd->setup_pkt) * 5, pcd->setup_pkt, pcd->setup_pkt_dma_handle); dma_free_coherent(NULL, sizeof(uint16_t), pcd->status_buf, pcd->status_buf_dma_handle); } else { kfree(pcd->setup_pkt); kfree(pcd->status_buf); } kfree(pcd); otg_dev->pcd = 0; } /** * This function registers a gadget driver with the PCD. * * When a driver is successfully registered, it will receive control * requests including set_configuration(), which enables non-control * requests. then usb traffic follows until a disconnect is reported. * then a host may connect again, or the driver might get unbound. * * @param _driver The driver being registered */ int usb_gadget_register_driver(struct usb_gadget_driver *_driver) { int retval; DWC_DEBUGPL(DBG_PCD, "registering gadget driver '%s'\n", _driver->driver.name); if (!_driver || _driver->speed == USB_SPEED_UNKNOWN || !_driver->bind || !_driver->disconnect || !_driver->setup) { DWC_DEBUGPL(DBG_PCDV, "EINVAL\n"); #if 1 printk("_driver=0x%p speed=0x%x bind=0x%p unbind=0x%p disconnect=0x%p setup=0x%p\n", _driver, _driver->speed, _driver->bind, _driver->unbind, _driver->disconnect, _driver->setup); #endif return -EINVAL; } if (s_pcd == 0) { DWC_DEBUGPL(DBG_PCDV, "ENODEV\n"); return -ENODEV; } if (s_pcd->driver != 0) { DWC_DEBUGPL(DBG_PCDV, "EBUSY (%p)\n", s_pcd->driver); return -EBUSY; } /* hook up the driver */ s_pcd->driver = _driver; s_pcd->gadget.dev.driver = &_driver->driver; { dwc_otg_core_if_t *_core_if = s_pcd->otg_dev->core_if; if(_core_if) { dwc_otg_disable_global_interrupts(_core_if); dwc_otg_core_init(_core_if); dwc_otg_pcd_reinit(s_pcd); dwc_otg_enable_global_interrupts(_core_if); if (_core_if->pcd_cb) dwc_otg_pcd_start_cb(_core_if->pcd_cb->p); } } DWC_DEBUGPL(DBG_PCD, "bind to driver %s\n", _driver->driver.name); retval = _driver->bind(&s_pcd->gadget); if (retval) { DWC_ERROR("bind to driver %s --> error %d\n", _driver->driver.name, retval); s_pcd->driver = 0; s_pcd->gadget.dev.driver = 0; return retval; } DWC_DEBUGPL(DBG_ANY, "registered gadget driver '%s'\n", _driver->driver.name); return 0; } EXPORT_SYMBOL(usb_gadget_register_driver); /** * This function unregisters a gadget driver * * @param _driver The driver being unregistered */ int usb_gadget_unregister_driver(struct usb_gadget_driver *_driver) { //DWC_DEBUGPL(DBG_PCDV,"%s(%p)\n", __func__, _driver); if (s_pcd == 0) { DWC_DEBUGPL(DBG_ANY, "%s Return(%d): s_pcd==0\n", __func__,-ENODEV); return -ENODEV; } if (_driver == 0 || _driver != s_pcd->driver) { DWC_DEBUGPL(DBG_ANY, "%s Return(%d): driver?\n", __func__,-EINVAL); return -EINVAL; } _driver->unbind(&s_pcd->gadget); s_pcd->driver = 0; DWC_DEBUGPL(DBG_ANY, "unregistered driver '%s'\n", _driver->driver.name); return 0; } EXPORT_SYMBOL(usb_gadget_unregister_driver); #endif /* DWC_HOST_ONLY */