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Subject[V2 PATCH 06/10] added media agnostic (MA) UDC
Date
This is where we implement the behavior of a USB device controller for
the MA USB device-side driver. The MA UDC interfaces with a gadget driver
and appears to the driver as a regular UDC. However, instead of sending
USB packets over a wired USB bus, the MA UDC hands MA USB packets off to
a media specific layer for transport.

Signed-off-by: Sean O. Stalley <sean.stalley@intel.com>
Signed-off-by: Stephanie Wallick <stephanie.s.wallick@intel.com>
---
drivers/staging/mausb/drivers/mausb_udc.c | 1486 +++++++++++++++++++++++++++++
drivers/staging/mausb/drivers/mausb_udc.h | 147 +++
2 files changed, 1633 insertions(+)
create mode 100644 drivers/staging/mausb/drivers/mausb_udc.c
create mode 100644 drivers/staging/mausb/drivers/mausb_udc.h

diff --git a/drivers/staging/mausb/drivers/mausb_udc.c b/drivers/staging/mausb/drivers/mausb_udc.c
new file mode 100644
index 0000000..af00786
--- /dev/null
+++ b/drivers/staging/mausb/drivers/mausb_udc.c
@@ -0,0 +1,1486 @@
+/* name: mausb_udc.c
+ * description: Implements a USB device controller(UDC) for interfacing with
+ * gadget drivers. The gadget driver uses this interface to return
+ * descriptors and to implement configuration and data transfer
+ * protocols with the pHCD. The UDC also allocates and initializes
+ * endpoints to support gadget/pHCD interfacing.
+ *
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Contact Information:
+ * Sean Stalley, sean.o.stalley@intel.com
+ * Stephanie Wallick, stephanie.s.wallick@intel.com
+ * 2111 NE 25th Avenue
+ * Hillsboro, Oregon 97124
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+ * Neither the name of Intel Corporation nor the names of its
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS 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.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/platform_device.h>
+#include <linux/usb/ch11.h>
+#include <linux/usb/gadget.h>
+#include <linux/device.h>
+#include <linux/usb/composite.h>
+#include <linux/spinlock.h>
+
+#include "mausb_udc.h"
+#include "mausb_mgmt.h"
+#include "mausb_mem.h"
+#include "mausb_msapi.h"
+#include "mausb_tx.h"
+
+static const char ep0[] = "ep0";
+static const char *const ep_name[] = {ep0, "ep1", "ep2"};
+
+static struct platform_device udc_pdev;
+
+void udc_dev_release(struct device *dev)
+{
+ /* free any dynamically allocated structures here */
+}
+
+static inline struct mausb_udc *gadget_to_udc(struct usb_gadget *gadget)
+{
+ return container_of(gadget, struct mausb_udc, gadget);
+}
+
+static inline struct mausb_udc *gadget_dev_to_mausb_udc(struct device *dev)
+{
+ return container_of(dev, struct mausb_udc, gadget.dev);
+}
+
+static inline struct mausb_request *usb_req_to_mausb_req(
+ struct usb_request *req)
+{
+ return container_of(req, struct mausb_request, req);
+}
+
+static inline struct mausb_udc *mausb_ma_dev_to_udc(struct ma_dev *ma_dev)
+{
+ return container_of(ma_dev, struct mausb_udc, ma_dev);
+}
+
+/*
+ * forward declarations
+ */
+static int set_or_clear_gadget_feature(struct usb_ctrlrequest *ctrlreq,
+ struct mausb_udc *udc, int set);
+static int get_gadget_status(struct usb_ctrlrequest *ctrlreq,
+ struct mausb_udc *udc);
+
+/**
+ * Finds a matching endpoint for a given address.
+ */
+static struct usb_ep *get_ep(struct mausb_udc *udc, u8 address)
+{
+ int i;
+ struct usb_ep *ep;
+
+ /* address is 0 (ignore direction bit flag) */
+ if ((address & ~USB_DIR_IN) == 0)
+ return &udc->usb_ep[0].dev_ep;
+
+ /* otherwise look for match */
+ for (i = 1; i < MAUDC_MAX_NUM_EP; i++) {
+
+ ep = &udc->usb_ep[i].dev_ep;
+
+ if (ep->address == address)
+ return ep;
+ }
+
+ maudc_dbg(udc, "%s: no endpoint found for address 0x%x\n",
+ __func__, address);
+
+ return NULL;
+}
+
+/**
+ * Called by gadget driver to enable endpoint.
+ */
+static int mausb_ep_enable(struct usb_ep *ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ struct mausb_udc *udc = platform_get_drvdata(&udc_pdev);
+ struct mausb_host_ep *ma_ep = mausb_find_ep_by_desc(desc,
+ udc->mausb_dev);
+
+ maudc_dbg(udc, "%s: enabling gadget endpoint %s\n",
+ __func__, ep->name);
+
+ /* ep0 is control endpoint, don't try and configure it */
+ if (ep->name == ep0) {
+ maudc_err(udc, "%s: cannot configure ep0\n", __func__);
+ return -EINVAL;
+ }
+
+ /*
+ * Get maximum packet size from descriptor and set for ep.
+ * Bits 0->10 of wMaxPacketSize = maximum packet size for HS and
+ * FS devices maximum packet size for SS devices = 1024.
+ */
+ ep->maxpacket = EP_MAX_PACKET;
+
+ if (NULL != ma_ep)
+ mausb_link_ma_ep_to_usb_ep(ma_ep, ep);
+
+ return 0;
+}
+
+/**
+ * Called by gadget driver to disable endpoint.
+ */
+static int mausb_ep_disable(struct usb_ep *ep)
+{
+ struct mausb_udc *udc = platform_get_drvdata(&udc_pdev);
+
+ if (!ep) {
+ maudc_dbg(udc, "%s: no endpoint\n", __func__);
+ return -EINVAL;
+ }
+
+ maudc_dbg(udc, "%s: disabling gadget endpoint %s\n",
+ __func__, ep->name);
+
+ return 0;
+}
+
+/**
+ * Called by gadget driver to allocate a request packet.
+ */
+static struct usb_request *mausb_ep_alloc_request(struct usb_ep *ep,
+ gfp_t mem_flags)
+{
+ struct mausb_request *req;
+
+ if (!ep)
+ return NULL;
+
+ req = kzalloc(sizeof(*req), mem_flags);
+ if (!req)
+ return NULL;
+
+ INIT_LIST_HEAD(&req->usb_req_list);
+
+ return &req->req;
+}
+
+/**
+ * Called by gadget driver to free a request packet.
+ */
+static void mausb_ep_free_request(struct usb_ep *ep, struct usb_request *req)
+{
+ struct mausb_request *mreq;
+
+ if (!ep || !req)
+ return;
+
+ mreq = usb_req_to_mausb_req(req);
+ kfree(mreq);
+}
+
+/**
+ * Called by gadget driver to queue a request.
+ */
+static int mausb_ep_queue(struct usb_ep *ep, struct usb_request *req,
+ gfp_t mem_flags)
+{
+ struct mausb_udc *udc = platform_get_drvdata(&udc_pdev);
+ struct mausb_request *ma_req;
+ struct mausb_gadget_ep *gadget_ep;
+
+ if (!ep) {
+ maudc_err(udc, "%s: no endpoint\n", __func__);
+ return -EINVAL;
+ }
+
+ if (!req) {
+ maudc_err(udc, "%s: no USB request\n", __func__);
+ return -EINVAL;
+ }
+
+ ma_req = usb_req_to_mausb_req(req);
+ gadget_ep = usb_ep_to_mausb_gadget_ep(ep);
+
+ req->status = -EINPROGRESS;
+ req->actual = 0;
+
+ maudc_dbg(udc, "%s: queueing request to ep %i at 0x%p with data at "
+ "0x%p\n", __func__, usb_endpoint_num(ep->desc), ep, req->buf);
+
+ list_add_tail(&ma_req->usb_req_list, &gadget_ep->usb_req_list);
+
+ return 0;
+}
+
+/**
+ * Called by gadget driver to dequeue a request.
+ */
+static int mausb_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
+{
+ struct mausb_udc *udc = platform_get_drvdata(&udc_pdev);
+ struct mausb_request *ma_req;
+
+ if (!ep) {
+ maudc_err(udc, "%s: no endpoint\n", __func__);
+ return -EINVAL;
+ }
+
+ if (!req) {
+ maudc_err(udc, "%s: no USB request\n", __func__);
+ return -EINVAL;
+ }
+
+ ma_req = usb_req_to_mausb_req(req);
+
+ list_del(&ma_req->usb_req_list);
+
+ maudc_dbg(udc, "%s: dequeueing request\n", __func__);
+
+ return 0;
+}
+
+/**
+ * Halts or clears a halt of an endpoint.
+ */
+static int mausb_ep_set_halt(struct usb_ep *ep, int value)
+{
+ struct mausb_udc *udc = platform_get_drvdata(&udc_pdev);
+ struct mausb_host_ep *ma_ep = mausb_find_ep_dev(ep, udc->mausb_dev);
+
+ if (NULL == ma_ep) {
+ maudc_err(udc, "%s: no MA USB endpoint\n", __func__);
+ return -EINVAL;
+ }
+
+ /* probably don't want to halt default control ep */
+ if (ma_ep->dev_ep->name == ep0) {
+ maudc_err(udc, "%s: cannot halt ep0!\n", __func__);
+ return -EINVAL;
+ }
+
+ if (value) {
+ maudc_dbg(udc, "%s: halting ep\n", __func__);
+ ma_ep->halted = 1;
+ }
+
+ else {
+ maudc_dbg(udc, "%s: clearing ep halt\n", __func__);
+ ma_ep->halted = 0;
+ }
+
+ return 0;
+}
+
+/**
+ * Wedges an endpoint; wedge causes request to clear halt from host to be
+ * ignored.
+ */
+static int mausb_ep_set_wedge(struct usb_ep *ep)
+{
+ struct mausb_udc *udc = platform_get_drvdata(&udc_pdev);
+ struct mausb_host_ep *ma_ep = mausb_find_ep_dev(ep, udc->mausb_dev);
+
+ if (NULL == ma_ep) {
+ maudc_err(udc, "%s: no MA USB endpoint\n", __func__);
+ return -EINVAL;
+ }
+
+ /* wedging default control ep is probably bad */
+ if (ma_ep->dev_ep->name == ep0) {
+ maudc_dbg(udc, "%s: cannot wedge ep0\n", __func__);
+ return -EINVAL;
+ }
+
+ ma_ep->halted = 1;
+ ma_ep->wedged = 1;
+
+ return 0;
+}
+
+static struct usb_ep_ops mausb_ep_ops = {
+ .enable = mausb_ep_enable,
+ .disable = mausb_ep_disable,
+ .alloc_request = mausb_ep_alloc_request,
+ .free_request = mausb_ep_free_request,
+ .queue = mausb_ep_queue,
+ .dequeue = mausb_ep_dequeue,
+ .set_halt = mausb_ep_set_halt,
+ .set_wedge = mausb_ep_set_wedge
+};
+
+/*---------------------- transfer operations ------------------------------*/
+
+/**
+ * Handles control requests from usb core. Returns 0 if request is fully
+ * handled, otherwise returns the length of the transfer
+ */
+static int handle_ma_control_request(struct mausb_host_ep *ep,
+ struct usb_ctrlrequest *ctrlreq)
+{
+ int ret = 0;
+ struct mausb_udc *udc = platform_get_drvdata(&udc_pdev);
+
+ if (!ctrlreq) {
+ maudc_err(udc, "%s: no control request\n", __func__);
+ return -EINVAL;
+ }
+
+ /*
+ * UDC handles set/clear feature, get status, and set address
+ * requests, anything else is passed to gadget driver.
+ */
+ switch (ctrlreq->bRequest) {
+ case USB_REQ_CLEAR_FEATURE:
+ maudc_dbg(udc, "USB_REQ: clearing feature\n");
+ ret = set_or_clear_gadget_feature(ctrlreq, udc, 0);
+ break;
+
+ case USB_REQ_GET_STATUS:
+ maudc_dbg(udc, "USB_REQ: getting status\n");
+ ret = get_gadget_status(ctrlreq, udc);
+ break;
+
+ case USB_REQ_SET_FEATURE:
+ maudc_dbg(udc, "USB_REQ: setting feature\n");
+ ret = set_or_clear_gadget_feature(ctrlreq, udc, 1);
+ break;
+
+ default: /* pass the request to the gadget driver */
+ maudc_dbg(udc, "USB_REQ: forwarding REQ #%i to gadget driver\n",
+ ctrlreq->bRequest);
+ if (NULL != udc->driver)
+ ret = udc->driver->setup(&udc->gadget, ctrlreq);
+ else
+ maudc_err(udc, "gadget driver not found\n");
+
+ if (ret >= 0)
+ ret = ctrlreq->wLength;
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * Transfers contents of request and endpoint buffers.
+ */
+int do_ma_transfer(struct mausb_host_ep *ep, struct mausb_pkt *tx_req,
+ bool dir_in)
+{
+ int i = 0;
+ int out_copy_length = 0;
+ int ret, host_len, device_len;
+ int status = -EINPROGRESS;
+ int length = 0;
+ struct mausb_transfer_state *tx_state = &ep->active_transfer->state;
+ struct mausb_request *req, *next;
+ struct mausb_udc *udc = platform_get_drvdata(&udc_pdev);
+ void *epbuf, *rbuf;
+
+ /* look for setup data */
+ if (tx_req->setup)
+ ret = handle_ma_control_request(ep, tx_req->setup);
+
+ if (NULL == ep->usb_req_list)
+ return -ENOTCONN;
+
+ if (list_empty(ep->usb_req_list) && !in_interrupt()) {
+ maudc_dbg(udc, "wait gadget function driver submit request\n");
+ while (list_empty(ep->usb_req_list) &&
+ i <= MAUSB_GADGET_TIMEOUT) {
+ msleep(1);
+ i++;
+ }
+ }
+ if (i > MAUSB_GADGET_TIMEOUT) {
+ maudc_dbg(udc, "Wait gadget request time out\n");
+ return -ETIMEDOUT;
+ }
+
+ loop_request_queue:
+ /* take care of each request in request queue */
+ list_for_each_entry_safe(req, next, ep->usb_req_list, usb_req_list) {
+
+ if (dir_in)
+ host_len = tx_state->rem_size - ep->actual_length;
+ else
+ host_len = tx_req->buffer_length - out_copy_length;
+ device_len = req->req.length - req->req.actual;
+ length = min(host_len, device_len);
+
+ /* there is something to transfer so do transfer */
+ if (length > 0) {
+
+ rbuf = req->req.buf + req->req.actual;
+
+ /*
+ * If IN transfer, copy req buffer contents into
+ * ep buffer. Vice versa for OUT transfer.
+ */
+ if (dir_in) {
+ epbuf = ep->buffer + ep->actual_length;
+ if (epbuf)
+ memcpy(epbuf, rbuf, length);
+ else
+ maudc_err(udc, "%s: no ep buffer\n",
+ __func__);
+ } else {
+ /*
+ * For bulk OUT, we can't use ep->actual_length
+ * as indicator because ep->buffer for every
+ * transfer request is only "rx_buf_size" bytes
+ * length.
+ */
+ epbuf = ep->buffer + out_copy_length;
+ memcpy(rbuf, epbuf, length);
+ out_copy_length += length;
+ }
+ ep->actual_length += length;
+ req->req.actual += length;
+ }
+ /* zero length packet ends a read */
+ else {
+ req->req.status = 0;
+ status = 0;
+ }
+
+ /*
+ * A transfer usually ends when buffer contents are completely
+ * transferred. But, look out for for the zero packet transfer
+ * flag. If flag is set, bulk OUT transfers need to wait for
+ * zero length packet (short packet) for completion.
+ */
+ if ((req->req.length == req->req.actual) ||
+ /* bulk IN short packet */
+ (dir_in && (req->req.actual % ep->dev_ep->maxpacket)) ||
+ /* bulk OUT transfer all data requested by host urb*/
+ (!dir_in && ep->active_transfer->transfer_size
+ == ep->actual_length) ||
+ /* bulk OUT last request */
+ (!dir_in && req->req.zero)) {
+ req->req.status = 0;
+ /* device completion */
+ list_del_init(&req->usb_req_list);
+ req->req.complete(ep->dev_ep, &req->req);
+ }
+
+ if (tx_state->rem_size == 0)
+ status = 0;
+
+ /*
+ * Host completion - end when nothing left to read/write,
+ * otherwise keep going through queue.
+ */
+ if (status != -EINPROGRESS)
+ break;
+ /* bulk IN/OUT transfers last request serves for one host urb */
+ if (tx_state->rem_size == req->req.actual) {
+ maudc_dbg(udc, "bulk IN/OUT last request return\n");
+ break;
+ }
+ /* bulk IN short packet */
+ if (dir_in && (req->req.actual % ep->dev_ep->maxpacket)) {
+ maudc_dbg(udc, "bulk IN short packet return\n");
+ break;
+ }
+ /*
+ * Bulk OUT transfer contains multiple bulk OUT MA requests.
+ * So for bulk out MA request just return to serve subsequent
+ * bulk out MA request.
+ */
+ if (!dir_in && host_len == length) {
+ maudc_dbg(udc, "normal bulk OUT MA request return\n");
+ break;
+ }
+ /*
+ * Gadget driver should transfer more data to
+ * serve bulk IN transfer, then wait for more requests.
+ */
+ if (dir_in && (req->req.actual % ep->dev_ep->maxpacket == 0) &&
+ (tx_state->rem_size - ep->actual_length > 0)
+ && !req->req.zero) {
+ if (list_empty(ep->usb_req_list)) {
+ maudc_dbg(udc, "bulk IN: gadget request queue"
+ " is empty - waiting . . .\n");
+ while (list_empty(ep->usb_req_list))
+ msleep(1);
+ }
+ goto loop_request_queue;
+ }
+ /*
+ * Doesn't copy all data in MA USB bulk OUT request.
+ * Wait for additional gadget requests
+ * to serve this MA USB bulk OUT request.
+ */
+ if (!dir_in && (host_len > length)) {
+ if (list_empty(ep->usb_req_list)) {
+ maudc_dbg(udc, "bulk OUT: gadget request"
+ " is queue empty - waiting . . .\n");
+ while (list_empty(ep->usb_req_list))
+ msleep(1);
+ }
+ goto loop_request_queue;
+ }
+ }
+
+ return ep->actual_length;
+}
+
+
+/*------------------------- gadget operations -------------------------*/
+
+/**
+ * Handles control request to get device status.
+ */
+static int get_gadget_status(struct usb_ctrlrequest *ctrlreq,
+ struct mausb_udc *udc)
+{
+ int ret = 0;
+ char *buf;
+ unsigned int address = le16_to_cpu(ctrlreq->wIndex);
+ struct usb_ep *usb_ep = get_ep(udc, address);
+ struct mausb_host_ep *ma_ep = mausb_find_ep_dev(usb_ep,
+ udc->mausb_dev);
+
+ if (!ma_ep) {
+ maudc_err(udc, "%s: cannot find endpoint\n", __func__);
+ return -EINVAL;
+ }
+
+ buf = (char *)ma_ep->buffer;
+
+ maudc_dbg(udc, "%s: responding to request type %i\n",
+ __func__, ctrlreq->bRequestType);
+
+ /* requesting device status */
+ switch (ctrlreq->bRequestType) {
+ case DEV_IN_REQ:
+ buf[0] = udc->dev_status;
+ ma_ep->actual_length = 1;
+ break;
+
+ /* requesting an endpoint status */
+ case EP_IN_REQ:
+ buf[0] = ma_ep->halted;
+ ma_ep->actual_length = 1;
+ break;
+
+ /* requesting interface status */
+ case INTF_IN_REQ:
+ buf[0] = 0;
+ break;
+
+ default:
+ maudc_dbg(udc, "%s: invalid request type %i\n",
+ __func__, ctrlreq->bRequestType);
+ ret = -EOPNOTSUPP;
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * Handles control request to set a gadget device feature.
+ */
+static int set_or_clear_gadget_feature(struct usb_ctrlrequest *ctrlreq,
+ struct mausb_udc *udc, int set)
+{
+ int ret = 0;
+ unsigned int address = le16_to_cpu(ctrlreq->wIndex);
+ struct usb_ep *usb_ep = get_ep(udc, address);
+ struct mausb_host_ep *ma_ep = mausb_find_ep_dev(usb_ep,
+ udc->mausb_dev);
+
+ if (ctrlreq->bRequestType == EP_REQ) {
+
+ if (!ma_ep)
+ ret = -EINVAL;
+ else if (ma_ep->dev_ep->name == udc->gadget.ep0->name) {
+ maudc_err(udc, "%s: cannot halt ep0!\n", __func__);
+ ret = -EINVAL;
+ } else {
+ ma_ep->halted = set;
+ maudc_dbg(udc, "%s: %s halt %s\n", __func__,
+ ma_ep->dev_ep->name, set ? "set" : "cleared");
+ }
+ }
+
+ return ret;
+}
+
+/**
+ * Handles incoming management packets. Used to pass an MA USB management
+ * packet to the device.
+ */
+static int maudc_transfer_mgmt_packet(struct ms_pkt *ms_pkt, void *context)
+{
+ int ret;
+ struct mausb_pkt *pkt;
+ struct mausb_udc *udc = platform_get_drvdata(&udc_pdev);
+ struct mausb_mgmt *mgmt;
+
+ if ((NULL == context) || (NULL == ms_pkt)) {
+ maudc_err(udc, "%s: received NULL %s\n", __func__,
+ context ? "packet" : "context");
+ return -EFAULT;
+ }
+
+ mgmt = (struct mausb_mgmt *) context;
+
+ pkt = mausb_pkt_from_ms_pkt(ms_pkt,
+ udc->ma_dev.ms_driver->ops->pkt_destructor, GFP_ATOMIC);
+
+ maudc_dbg(udc, "%s: received %s packet\n", __func__,
+ mausb_type_to_string(pkt->common->pkt_type));
+
+ ret = mausb_rx_mgmt(pkt, mgmt);
+
+ return ret;
+}
+
+/**
+ * Suspends gadget..Called when a MAUSBDeviceSleepReq management packet is
+ * received.
+ */
+static void mausb_device_suspend(void)
+{
+ struct mausb_udc *udc = platform_get_drvdata(&udc_pdev);
+
+ if (udc->driver)
+ udc->driver->suspend(&udc->gadget);
+}
+
+/**
+ * Resumes gadget. Called by mausb_bus_resume in hcd to resume a connected
+ * device.
+ */
+static void mausb_device_resume(void)
+{
+ struct mausb_udc *udc = platform_get_drvdata(&udc_pdev);
+
+ if (udc->driver)
+ udc->driver->resume(&udc->gadget);
+}
+
+/**
+ * Manages USB device connection to host. Called for connect and disconnect
+ * events.
+ */
+static int mausb_udc_pullup(struct usb_gadget *gadget, int is_on)
+{
+ struct mausb_udc *udc = gadget_to_udc(gadget);
+
+ udc->usb_ep[0].dev_ep.maxpacket = 64;
+ udc->gadget.speed = udc->driver->max_speed;
+ udc->pullup = is_on;
+
+ return 0;
+}
+
+/**
+ * Assigns an MA USB ep handle to the given endpoint.
+ */
+static void maudc_assign_ep_handle(struct mausb_host_ep *ma_ep,
+ struct usb_endpoint_descriptor *ep_des)
+{
+ struct mausb_ep_handle *handle = &ma_ep->ep_handle;
+
+ handle->dir = usb_endpoint_dir_in(ep_des) ? 1 : 0;
+ handle->ep_num = usb_endpoint_num(ep_des);
+ handle->dev_addr = MAUDC_DEV_ADDR;
+ handle->bus_num = MAUSB_VIRTUAL_BUS_NUM;
+
+ ma_ep->ep_handle_state = MAUSB_EP_HANDLE_ACTIVE;
+}
+
+/**
+ * Adds a media-agnostic endpoint datastructure to the UDC for the given
+ * endpoint.
+ */
+static int maudc_add_ma_ep(struct usb_endpoint_descriptor *ep_des,
+ struct mausb_dev *mausb_dev, struct mausb_host_ep **mausb_ep)
+{
+ int ret = -EINVAL;
+ struct mausb_host_ep *ma_ep;
+ struct mausb_ms_drv *drv = mausb_dev->ma_dev->ms_driver;
+ struct mausb_udc *udc = platform_get_drvdata(&udc_pdev);
+ struct usb_ep *usb_ep = get_ep(udc, ep_des->bEndpointAddress);
+ unsigned long irq_flags;
+ int (*transfer_pkt)(struct ms_pkt *pkt, void *context);
+
+ if (USB_ENDPOINT_XFER_CONTROL == usb_endpoint_type(ep_des)) {
+
+ maudc_dbg(udc, "%s: adding control endpoint %i...\n",
+ __func__, usb_endpoint_num(ep_des));
+ transfer_pkt = &receive_ma_packet_control;
+
+ } else if (usb_endpoint_dir_in(ep_des)) {
+ maudc_dbg(udc, "%s: adding IN endpoint %i...\n",
+ __func__, usb_endpoint_num(ep_des));
+ transfer_pkt = &receive_ma_packet_IN;
+
+ } else if (usb_endpoint_dir_out(ep_des)) {
+ maudc_dbg(udc, "%s: adding OUT endpoint %i...\n",
+ __func__, usb_endpoint_num(ep_des));
+ transfer_pkt = &receive_ma_packet_OUT;
+
+ } else {
+ maudc_dbg(udc, "%s: unknown endpoint type\n", __func__);
+ return -EINVAL;
+ }
+
+ mausb_internal_add_ep(mausb_dev, NULL, usb_ep, &ma_ep,
+ &device_transfer_timeout, GFP_ATOMIC);
+
+ if (NULL == ma_ep)
+ return -ENOMEM;
+
+ maudc_dbg(udc, "%s: added endpoint at 0x%p\n", __func__, ma_ep);
+
+ spin_lock_irqsave(&ma_ep->ep_lock, irq_flags);
+
+ maudc_assign_ep_handle(ma_ep, ep_des);
+ ret = mausb_add_data_channel(drv, ma_ep, transfer_pkt);
+
+ ma_ep->gadget = mausb_dev->gadget;
+
+ /*
+ * Note: The UDC uses a single MA URB to track the transfer
+ * State variables for the active transfer.
+ */
+ ma_ep->active_transfer = mausb_alloc_maurb(ma_ep, GFP_ATOMIC);
+
+ if (NULL != mausb_ep)
+ *mausb_ep = ma_ep;
+
+ spin_unlock_irqrestore(&ma_ep->ep_lock, irq_flags);
+
+ return ret;
+}
+
+/**
+ * Registers a media specific driver with the media agnostic driver.
+ */
+struct mausb_ma_drv *maudc_register_ms_driver(struct mausb_ms_drv *drv)
+{
+ struct mausb_udc *udc = platform_get_drvdata(&udc_pdev);
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&udc->udc_lock, irq_flags);
+ udc->ma_dev.ms_driver = drv;
+ spin_unlock_irqrestore(&udc->udc_lock, irq_flags);
+
+ /* open the management channel */
+ maudc_dbg(udc, "%s: adding Managment channel...\n", __func__);
+ mausb_add_mgmt_channel(&udc->ma_dev.mgmt, drv,
+ &maudc_transfer_mgmt_packet, &mausb_mgmt_pkt_sent);
+
+ return &udc->ma_dev.ma_drv;
+}
+EXPORT_SYMBOL(maudc_register_ms_driver);
+
+int check_for_device(int dont_use)
+{
+ struct mausb_udc *udc = platform_get_drvdata(&udc_pdev);
+
+ if (udc->driver != NULL)
+ return 1;
+
+ return 0;
+}
+
+static int mausb_udc_start(struct usb_gadget *gadget,
+ struct usb_gadget_driver *driver)
+{
+ struct mausb_udc *udc = gadget_to_udc(gadget);
+
+ maudc_dbg(udc, "%s: binding gadget '%s' driver\n",
+ __func__, driver->driver.name);
+
+ udc->driver = driver;
+
+ return 0;
+}
+
+static int mausb_udc_stop(struct usb_gadget *gadget,
+ struct usb_gadget_driver *driver)
+{
+ struct mausb_udc *udc = gadget_to_udc(gadget);
+
+ maudc_dbg(udc, "%s: stopping udc\n", __func__);
+
+ udc->driver = NULL;
+
+ return 0;
+}
+
+/**
+ * API to UDC operations that do not involve endpoints or i/o.
+ */
+static struct usb_gadget_ops mudc_ops = {
+ .pullup = &mausb_udc_pullup,
+ .udc_start = &mausb_udc_start,
+ .udc_stop = &mausb_udc_stop
+};
+
+/**
+ * Appends a Capabilities Descriptor to the end of a CapResp packet.
+ *
+ * @resp: CapResp to that will carry descriptor.
+ * @type: Descriptor type to add.
+ * Note: make sure to use values from MA USB Spec, Table 14.
+ * @offset: Total length of other Device Capability Descriptors
+ * in resp.
+ *
+ * Returns length of added descriptor.
+ */
+static int add_cap_desc(struct mausb_mgmt_pkt *resp, int type, int offset)
+{
+ int ret = 0;
+ int ttl_offset;
+ struct mausb_dev_cap_desc *desc;
+ struct mausb_udc *udc = platform_get_drvdata(&udc_pdev);
+
+ ttl_offset = MAUSB_PKT_HEADER_SIZE +
+ sizeof(struct mausb_CapResp_flds) + offset;
+ desc = cap_desc_ptr_increment(resp, ttl_offset);
+
+ switch (type) {
+ case MAUSB_DEV_CAP_SPEED:
+ desc->length = MAUSB_DEV_CAP_SPEED_LENGTH;
+ desc->cap_type = MAUSB_DEV_CAP_SPEED;
+ desc->speed.speed = MAUSB_DEV_CAP_SPEED_SUPER;
+ /* TODO: assign speed fields meaningful values */
+ desc->speed.lse = 1;
+ desc->speed.st = 2;
+ desc->speed.lane_count = 3;
+ desc->speed.link_protocol = 3;
+ desc->speed.lsm = 234;
+ ret = desc->length;
+ break;
+ case MAUSB_DEV_CAP_POUT:
+ break;
+ case MAUSB_DEV_CAP_ISO:
+ break;
+ case MAUSB_DEV_CAP_SYNC:
+ break;
+ case MAUSB_DEV_CAP_CONT_ID:
+ break;
+ case MAUSB_DEV_CAP_LINK_SLEEP:
+ desc->length = MAUSB_DEV_CAP_LINK_SLEEP_LENGTH;
+ desc->cap_type = MAUSB_DEV_CAP_LINK_SLEEP;
+ desc->link_sleep.link_sleep_cap = 0;
+ ret = desc->length;
+ break;
+ default:
+ maudc_err(udc, "%s: invalid Device Capability Type %i\n",
+ __func__, type);
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * Finds an MA USB endpoint descriptor inside of an endpoint handle response.
+ */
+static void maudc_fill_ma_ep_desc(struct mausb_ep_des *ma_ep_des,
+ struct usb_endpoint_descriptor *ep_des,
+ struct mausb_host_ep *ma_ep)
+{
+ ma_ep_des->ep_handle.handle = ma_ep->ep_handle.handle;
+ ma_ep_des->dir = usb_endpoint_dir_in(ep_des) ? 1 : 0;
+ ma_ep_des->iso = usb_endpoint_xfer_isoc(ep_des) ? 1 : 0;
+ ma_ep_des->l_man = 0;
+ ma_ep_des->valid = 0;
+ ma_ep_des->rsvd_0 = 0;
+
+ if ((usb_endpoint_dir_out(ep_des) && !usb_endpoint_xfer_isoc(ep_des))
+ || usb_endpoint_xfer_control(ep_des)) {
+ ma_ep_des->ccu = 1;
+ } else
+ ma_ep_des->ccu = 0;
+
+ ma_ep_des->rsvd_1 = 0;
+
+ if (usb_endpoint_dir_out(ep_des) || usb_endpoint_xfer_control(ep_des))
+ ma_ep_des->buffer_size = ma_ep->state.rx_buf_size;
+ else
+ ma_ep_des->buffer_size = 0;
+
+ if (usb_endpoint_xfer_isoc(ep_des)) {
+ /* TODO: iso transfers */
+ /* ma_ep_des->iso_prog_dly = 0; */
+ /* ma_ep_des->iso_resp_dly = 0; */
+ } else {
+ ma_ep_des->iso_prog_dly = 0;
+ ma_ep_des->iso_resp_dly = 0;
+ }
+}
+
+/**
+ * Handles incoming EPHandleReq packets and fills EPHandleResp fields.
+ */
+static enum mausb_pkt_status maudc_handle_ep_req(struct mausb_dev *mausb_dev,
+ struct mausb_EPHandleReq_flds *req,
+ struct mausb_EPHandleResp_flds *resp)
+{
+ int i;
+ enum mausb_pkt_status status = UNSUCCESSFUL;
+ struct mausb_udc *udc = platform_get_drvdata(&udc_pdev);
+ struct usb_endpoint_descriptor *ep_des;
+ struct usb_ep *usb_ep;
+ struct mausb_host_ep *ma_ep;
+
+ resp->num_ep_des = req->num_ep_des;
+
+ /* TODO: Sanity check; make sure we dont look past end of packet */
+ for (i = 0; i < req->num_ep_des; ++i) {
+
+ ep_des = mausb_ep_handle_req_get_ep_des(req, i);
+
+ if (NULL != ep_des) {
+
+ ma_ep = mausb_find_ep_by_address(
+ ep_des->bEndpointAddress, mausb_dev);
+
+ if (NULL != ma_ep) {
+ maudc_warn(udc, "%s: endpoint already exists"
+ " resetting . . .\n", __func__);
+ mausb_internal_drop_ep(ma_ep);
+ }
+
+ maudc_add_ma_ep(ep_des, mausb_dev, &ma_ep);
+
+ if (NULL == ma_ep) {
+ maudc_err(udc, "%s: failed to add endpoint"
+ " for entry %i\n", __func__, i);
+ }
+
+ maudc_fill_ma_ep_desc(&resp->ep_des[i], ep_des, ma_ep);
+
+ usb_ep = get_ep(udc, ep_des->bEndpointAddress);
+
+ if (NULL != usb_ep)
+ mausb_link_ma_ep_to_usb_ep(ma_ep, usb_ep);
+
+ /* Per spec, if at least 1 endpoint assignment
+ * is sucessful, the packet returns success.
+ */
+ status = SUCCESS;
+ }
+ }
+
+ return status;
+}
+
+/**
+ * Handles incoming EPHandleDeleteReq packets and fills EPHandleDeleteResp
+ * fields.
+ */
+static enum mausb_pkt_status maudc_handle_ep_del_req(
+ struct mausb_dev *mausb_dev,
+ struct mausb_EPHandleDelete_flds *req,
+ struct mausb_EPHandleDelete_flds *resp)
+{
+ int i;
+ int ret = 0;
+ enum mausb_pkt_status status = UNSUCCESSFUL;
+ struct mausb_udc *udc = platform_get_drvdata(&udc_pdev);
+ struct mausb_host_ep *ma_ep = NULL;
+ struct mausb_ep_handle *req_handle;
+
+ resp->num_ep = 0;
+
+ /* TODO: Sanity check; make sure we dont look past end of packet */
+ for (i = 0; i < req->num_ep; ++i) {
+ req_handle = &req->ep_handle[i];
+
+ ma_ep = mausb_find_ep_by_handle(req_handle, mausb_dev);
+
+ ret = mausb_internal_drop_ep(ma_ep);
+
+ if (0 <= ret) {
+ /*
+ * per spec, the packet returns sucess if it can
+ * delete at least 1 endpoint
+ */
+ status = SUCCESS;
+
+ } else {
+ resp->ep_handle[resp->num_ep].handle
+ = req_handle->handle;
+ resp->num_ep++;
+
+ maudc_err(udc, "%s: could not delete endpoint with"
+ " handle %x\n", __func__, req_handle->handle);
+ }
+ }
+
+ return status;
+}
+
+/**
+ * Inactivate endpoints in EPInactivateReq packet and fill
+ * EPInactivateResp fields.
+ */
+static enum mausb_pkt_status maudc_handle_ep_inactivate(
+ struct mausb_EPInactivateReq_flds *req,
+ struct mausb_EPInactivateResp_flds *resp,
+ struct mausb_dev *dev)
+{
+ int i = 0;
+ int failures = 0;
+ enum mausb_pkt_status status = SUCCESS;
+ struct mausb_host_ep *ma_ep = NULL;
+ struct mausb_ep_handle *req_handle;
+
+ for (i = 0; i < req->num_ep_handles; ++i) {
+ req_handle = &req->ep_handle[i];
+ ma_ep = mausb_find_ep_by_handle(req_handle, dev);
+
+ if (!ma_ep) {
+ resp->ep_handle[failures] = *req_handle;
+ status = UNSUCCESSFUL;
+ failures++;
+ } else
+ ma_ep->ep_handle_state = MAUSB_EP_HANDLE_INACTIVE;
+ }
+
+ resp->num_ep_with_error = failures;
+
+ return status;
+}
+
+/**
+ * This function handles management requests to the UDC. It parses the packet
+ * and makes the necessary function calls into the system.
+ *
+ * @req: The incoming request to handle.
+ * @resp: The response packet to send out.
+ * @mgmt: The MA USB management structure associated with transfer.
+ *
+ * Note: this function only fills the packet type, status and
+ * request-specific data-fields. The remainder of the fields are set by
+ * mausb_rx_mgmt_req.
+ */
+static int udc_mgmt_req_switch(struct mausb_mgmt_pkt *req,
+ struct mausb_mgmt_pkt *resp, struct mausb_mgmt *mgmt)
+{
+ int ret = -EINVAL;
+ int desc_count = 0;
+ int offset = 0;
+ struct ma_dev *ma_dev = mausb_mgmt_to_ma_dev(mgmt);
+ struct mausb_udc *udc = mausb_ma_dev_to_udc(ma_dev);
+
+ /* always set the device handle */
+ req->common.dev_handle = udc->mausb_dev->dev_handle;
+
+ switch (req->common.pkt_type) {
+
+ case CapReq:
+ /* non-hub devices require a Speed Capability Descriptor */
+ ret = add_cap_desc(resp, MAUSB_DEV_CAP_SPEED, offset);
+ if (ret <= 0) {
+ maudc_err(udc, "%s: could not add speed capability "
+ "descriptor\n", __func__);
+ } else {
+ desc_count++;
+ offset += ret;
+ }
+
+ ret = add_cap_desc(resp, MAUSB_DEV_CAP_LINK_SLEEP, offset);
+ if (ret <= 0) {
+ maudc_err(udc, "%s; could not add link sleep"
+ " capability descriptor\n", __func__);
+ } else {
+ desc_count++;
+ offset += ret;
+ }
+
+ /*
+ * TODO: if want to add more device cap descriptors, this would
+ * be a good place to do it.
+ */
+
+ resp->common.pkt_type = CapResp;
+ resp->common.pkt_status = NO_ERROR;
+ resp->cap_resp.num_ep = CAP_MAX_EP_NUM;
+ resp->cap_resp.num_dev = CAP_MAX_DEV_NUM;
+ resp->cap_resp.num_stream = EP_MAX_STREAMS;
+ resp->cap_resp.dev_type = CAP_DEV_TYPE;
+ resp->cap_resp.desc_count = desc_count;
+ resp->cap_resp.desc_length = offset;
+ resp->cap_resp.max_tx_reqs = CAP_MAX_TX_REQS;
+ resp->cap_resp.max_mgmt_reqs = CAP_MAX_MGMT_REQS;
+
+ ret = 0;
+ break;
+ case USBDevHandleReq:
+ udc->mausb_dev->dev_handle = MAUDC_DEV_HANDLE;
+
+ resp->common.pkt_type = USBDevHandleResp;
+ resp->common.pkt_status = NO_ERROR;
+ resp->usb_dev_handle_resp = MAUDC_DEV_HANDLE;
+
+ ret = 0;
+ break;
+ case EPHandleReq:
+ resp->common.pkt_type = EPHandleResp;
+ resp->usb_dev_handle_resp = udc->mausb_dev->dev_handle;
+ resp->common.pkt_status = maudc_handle_ep_req(udc->mausb_dev,
+ &req->ep_handle_req, &resp->ep_handle_resp);
+ ret = 0;
+ break;
+ case EPActivateReq:
+ break;
+ case EPInactivateReq:
+ resp->common.pkt_type = EPInactivateResp;
+ resp->common.pkt_status = maudc_handle_ep_inactivate(
+ &req->ep_inactivate_req,
+ &resp->ep_inactivate_resp,
+ udc->mausb_dev);
+ ret = 0;
+ break;
+ case EPResetReq:
+ break;
+ case EPClearTransferReq:
+ break;
+ case EPHandleDeleteReq:
+ resp->common.pkt_type = EPHandleDeleteResp;
+
+ resp->common.pkt_status = maudc_handle_ep_del_req(
+ udc->mausb_dev, &req->ep_handle_delete,
+ &resp->ep_handle_delete);
+ ret = 0;
+ break;
+ case DevResetReq:
+ resp->common.pkt_type = DevResetResp;
+
+ ma_dev->ma_dev_addr = req->common.ma_dev_addr;
+ ma_dev->mass_id = req->common.mass_id;
+
+ ret = 0;
+
+ if (0 == ret) {
+ resp->common.pkt_status = NO_ERROR;
+ } else {
+ resp->common.pkt_status =
+ mausb_errno_to_ma_status(ret);
+ }
+ break;
+ case ModifyEP0Req:
+ resp->common.pkt_type = ModifyEP0Resp;
+ resp->common.pkt_status = SUCCESS;
+
+ /*
+ * TODO: fix so to spec - for now we don't track USB device
+ * state and can't do proper checks.
+ */
+ if (req->modify_ep0_req.ep_handle.dev_addr == 0) {
+ /* && USB device is in addressed state) { */
+ resp->modify_ep0_resp.ep_handle.handle =
+ req->modify_ep0_req.ep_handle.handle
+ | (MAUDC_DEV_ADDR << 5);
+ } else {
+ resp->modify_ep0_resp.ep_handle.handle = 0;
+ }
+
+ ret = 0;
+ break;
+ case SetUSBDevAddrReq:
+ resp->common.pkt_type = SetUSBDevAddrResp;
+ resp->common.pkt_status = NO_ERROR;
+ udc->mausb_dev->dev_address = MAUDC_DEV_ADDR;
+
+ resp->set_dev_addr_resp.dev_addr = udc->mausb_dev->dev_address;
+ ret = 0;
+ break;
+ case UpdateDevReq:
+ break;
+ case USBDevDisconnectReq:
+ resp->common.pkt_type = USBDevDisconnectResp;
+ resp->common.dev_handle = req->common.dev_handle;
+ resp->common.pkt_status = NO_ERROR;
+ ret = 0;
+ break;
+ case DevDisconnectReq:
+ resp->common.pkt_type = DevDisconnectResp;
+ resp->common.dev_handle = 0;
+ resp->common.pkt_status = NO_ERROR;
+ ret = 0;
+ break;
+ case SleepReq:
+ resp->common.pkt_type = SleepResp;
+ resp->common.pkt_status = NO_ERROR;
+ mausb_device_suspend();
+ ret = 0;
+ break;
+ case WakeReq:
+ resp->common.pkt_type = WakeResp;
+ resp->common.pkt_status = NO_ERROR;
+ mausb_device_resume();
+ ret = 0;
+ break;
+ case PingReq:
+ break;
+ case SyncReq:
+ break;
+ case CancelTransferReq:
+ resp->common.pkt_type = CancelTransferResp;
+ resp->common.pkt_status = NO_ERROR;
+ resp->cancel_transfer_resp.ep_handle =
+ req->cancel_transfer_req.ep_handle;
+ resp->cancel_transfer_resp.stream_id =
+ req->cancel_transfer_req.stream_id;
+ resp->cancel_transfer_resp.req_id =
+ req->cancel_transfer_req.req_id;
+ /* TODO: cancel transfer and set fields below accordingly */
+ resp->cancel_transfer_resp.cancel_status = 1;
+ resp->cancel_transfer_resp.deliv_seq_num = 0;
+ resp->cancel_transfer_resp.deliv_byte_offset = 0;
+ ret = 0;
+ break;
+ case EPOpenStreamReq:
+ break;
+ case EPCloseStreamReq:
+ break;
+ case USBDevResetReq:
+ break;
+ case VendorSpecificReq:
+ break;
+
+ /* Invalid packet type */
+ default:
+ maudc_err(udc, "%s: invalid packet type\n", __func__);
+ ret = -EBADMSG;
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * MA USB ep0 endpoint descriptor for a super speed endpoint
+ * per spec section 7.3.2.2.
+ */
+static struct usb_endpoint_descriptor mausb_ep0_desc = {
+
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = 0x00,
+ .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
+ .wMaxPacketSize = 512,
+ .bInterval = 0
+};
+
+/**
+ * UDC probe function
+ */
+int mausb_udc_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ int i;
+ struct mausb_udc *udc;
+ struct usb_ep *usb_ep;
+
+ udc = kzalloc(sizeof(*udc), GFP_KERNEL);
+ if (!udc)
+ return -ENOMEM;
+
+ udc->udc_lock = __SPIN_LOCK_UNLOCKED(udc->udc_lock);
+ /* initialize gadget structure */
+ udc->gadget.name = UDC_NAME;
+ udc->gadget.ops = &mudc_ops;
+ udc->gadget.speed = USB_SPEED_UNKNOWN;
+ udc->gadget.max_speed = USB_SPEED_SUPER;
+ udc->gadget.dev.parent = &pdev->dev;
+
+ /* set head for list of gadget endpoints */
+ INIT_LIST_HEAD(&udc->gadget.ep_list);
+
+ /* initalize the ma_dev structure */
+ mausb_init_ma_device(&udc->ma_dev, 0, 0,
+ NULL, udc, &udc_mgmt_req_switch, &check_for_device);
+
+ udc->mausb_dev = mausb_internal_alloc_dev(&udc->ma_dev, NULL,
+ &udc->gadget);
+
+ for (i = 0; i < MAUDC_MAX_NUM_EP; i++) {
+ usb_ep = &udc->usb_ep[i].dev_ep;
+
+ usb_ep->name = ep_name[i];
+ usb_ep->ops = &mausb_ep_ops;
+ usb_ep->maxpacket = EP_MAX_PACKET;
+ usb_ep->max_streams = EP_MAX_STREAMS;
+
+ list_add_tail(&usb_ep->ep_list, &udc->gadget.ep_list);
+
+ INIT_LIST_HEAD(&udc->usb_ep[i].usb_req_list);
+ }
+
+ /* give gadget driver ep0 then remove from list*/
+ udc->usb_ep[0].dev_ep.desc = &mausb_ep0_desc;
+ udc->gadget.ep0 = &udc->usb_ep[0].dev_ep;
+ list_del_init(&udc->usb_ep[0].dev_ep.ep_list);
+
+ /* add a new gadget to the udc class driver list */
+ ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "%s: could not add gadget UDC, error %d\n",
+ __func__, ret);
+ } else
+ platform_set_drvdata(pdev, udc);
+
+ return ret;
+}
+
+int mausb_udc_remove(struct platform_device *pdev)
+{
+ struct mausb_udc *udc = platform_get_drvdata(pdev);
+
+ dev_dbg(&pdev->dev, "%s: removing udc\n", __func__);
+
+ usb_del_gadget_udc(&udc->gadget);
+
+ return 0;
+}
+
+int mausb_udc_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct mausb_udc *udc = platform_get_drvdata(pdev);
+
+ dev_dbg(&pdev->dev, "%s: suspending udc\n", __func__);
+
+ udc->suspended = 1;
+
+ return 0;
+}
+
+int mausb_udc_resume(struct platform_device *pdev)
+{
+ struct mausb_udc *udc = platform_get_drvdata(pdev);
+
+ dev_dbg(&pdev->dev, "%s: resuming udc\n", __func__);
+
+ udc->suspended = 0;
+
+ return 0;
+}
+
+/**
+ * platform structures for USB Device Controller (UDC)
+ */
+static struct platform_device udc_pdev = {
+ .name = UDC_NAME,
+ .id = 0
+};
+
+static struct platform_driver udc_driver = {
+ .probe = mausb_udc_probe,
+ .remove = mausb_udc_remove,
+ .suspend = mausb_udc_suspend,
+ .resume = mausb_udc_resume,
+ .driver = {
+ .name = UDC_NAME,
+ .owner = THIS_MODULE
+ }
+};
+
+/**
+ * initialization function
+ *
+ * TODO: get rid of platform device and replace with "virtual" device
+ */
+static int mausb_udc_init(void)
+{
+ int ret;
+
+ pr_debug("loading MA USB UDC . . .\n");
+
+ /* register UDC driver */
+ ret = platform_driver_register(&udc_driver);
+ if (ret < 0) {
+ pr_err("failed to register UDC driver: err %d\n", ret);
+ } else {
+ /* register UDC device */
+ ret = platform_device_register(&udc_pdev);
+ if (ret < 0) {
+ pr_err("failed to register UDC device: err %d\n", ret);
+ platform_driver_unregister(&udc_driver);
+
+ } else {
+ /* direct the release function (for exiting) */
+ udc_pdev.dev.release = &udc_dev_release;
+ }
+ }
+
+ return ret;
+}
+module_init(mausb_udc_init);
+
+/**
+ * exit function
+ */
+static void mausb_udc_exit(void)
+{
+ /* deregister UDC device */
+ platform_device_unregister(&udc_pdev);
+
+ /* deregister UDC driver */
+ platform_driver_unregister(&udc_driver);
+
+}
+module_exit(mausb_udc_exit);
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("Intel");
+MODULE_DESCRIPTION("mausb_udc");
diff --git a/drivers/staging/mausb/drivers/mausb_udc.h b/drivers/staging/mausb/drivers/mausb_udc.h
new file mode 100644
index 0000000..b900b2d
--- /dev/null
+++ b/drivers/staging/mausb/drivers/mausb_udc.h
@@ -0,0 +1,147 @@
+/* name: mausb_udc.h
+ * description: header file for mausb_udc.h
+ *
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Contact Information:
+ * Sean Stalley, sean.o.stalley@intel.com
+ * Stephanie Wallick, stephanie.s.wallick@intel.com
+ * 2111 NE 25th Avenue
+ * Hillsboro, Oregon 97124
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2014 Intel Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright
+ notice, this list of conditions and the following disclaimer in
+ the documentation and/or other materials provided with the
+ distribution.
+ * Neither the name of Intel Corporation nor the names of its
+ contributors may be used to endorse or promote products derived
+ from this software without specific prior written permission.
+
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS 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 __MAUSB_UDC_H
+#define __MAUSB_UDC_H
+
+#include <linux/timer.h>
+#include <linux/usb/gadget.h>
+#include "mausb_state.h"
+#include "mausb_pkt.h"
+#include "mausb_msapi.h"
+#include "mausb_mem.h" /* for mgmt structure */
+#include "mausb_const.h"
+
+#define UDC_NAME "mausb udc"
+#define MAUDC_MAX_NUM_EP 3
+#define EP_MAX_PACKET 64 /* max number of packets ep can handle */
+#define EP_MAX_STREAMS 16 /* max number of streams ep can handle */
+#define REQ_BUF_SIZE 64
+#define CAP_MAX_EP_NUM 3 /* max number of endpoints state can be tracked for */
+#define CAP_MAX_DEV_NUM 1 /* max number of devices that can be managed
+ * note this is 1 because only hubs can have >1 */
+#define CAP_DEV_TYPE 0 /* device type: 0 = not an MA USB hub
+ * 1 = USB 2.0 hub
+ * 2 = USB 3.1 hub */
+#define CAP_MAX_TX_REQS 0x01FF /* max number of outstanding transfer requests
+ * device can track - arbitrarily chosen */
+#define CAP_MAX_MGMT_REQS 0x01F /* max number of outstanding management requests
+ * device can track - arbitrarily chosen */
+
+#define MAUDC_DEV_HANDLE 0x1359 /* MA Device handle for the USB device */
+
+#define MAUDC_DEV_ADDR 0x7D /* USB Device address for the USB device */
+ /* Note: MAUDC_DEV_ADDR is arbitrary */
+
+#define MAUDC_BUS_NUM 0xD /* Bus number to be used in the endpoint handle */
+
+#define MAUSB_GADGET_TIMEOUT 3 /* time out for gadget driver enqueue request */
+
+#define maudc_info(udc, fmt, args...) \
+ dev_info(udc->gadget.dev.parent , fmt , ## args)
+#define maudc_dbg(udc, fmt, args...) \
+ dev_dbg(udc->gadget.dev.parent , fmt , ## args)
+#define maudc_warn(udc, fmt, args...) \
+ dev_warn(udc->gadget.dev.parent , fmt , ## args)
+#define maudc_err(udc, fmt, args...) \
+ dev_err(udc->gadget.dev.parent , fmt , ## args)
+
+/* function declarations */
+void udc_dev_release(struct device *dev);
+int mausb_udc_probe(struct platform_device *pdev);
+int mausb_udc_remove(struct platform_device *pdev);
+int mausb_udc_suspend(struct platform_device *pdev, pm_message_t state);
+int mausb_udc_resume(struct platform_device *pdev);
+int check_for_device(int dont_use);
+
+
+/* function declarations */
+int do_ma_transfer(struct mausb_host_ep *ep, struct mausb_pkt *tx_req,
+ bool dir_in);
+/**
+ * UDC structure
+ *
+ * The UDC structure holds all of the per-device data. This includes both the
+ * media agnostic device data as well as the USB device data. The USB device
+ * connected to the UDC is considered an integrated USB Device.
+ *
+ * @mausb_gadget_ep: An array of all the endpoints for this device.
+ * @usb_gadget: The device's gadget structure.
+ * @usb_gadget_driver: the device's driver.
+ * @ma_dev: The media agnostic device structure. Holds all the
+ * data common to all media agnostic devices.
+ * @mausb_dev: Holds media agnostic data that represents a USB device.
+ * @ms_driver: The MAUSB driver's interface with the media specific
+ * driver.
+ * @udc_lock: The 'big' lock. Used to protect this structure's data
+ * from concurrent access.
+ * @dev_status: Holds USB device status.
+ * @suspended: 1 when UDC is suspended, otherwise 0.
+ * @pullup: 1 when a USB device is connecting to UDC, otherwise 0.
+ */
+struct mausb_udc {
+ struct mausb_gadget_ep usb_ep[MAUDC_MAX_NUM_EP];
+ struct usb_gadget gadget;
+ struct usb_gadget_driver *driver;
+ struct ma_dev ma_dev;
+ struct mausb_dev *mausb_dev;
+ spinlock_t udc_lock;
+ u16 dev_status;
+ unsigned suspended:1;
+ unsigned pullup:1;
+};
+
+#endif
--
1.9.1


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