--- /dev/null
+/*
+ * dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver.
+ *
+ * Maintainer: Alan Stern <stern@rowland.harvard.edu>
+ *
+ * Copyright (C) 2003 David Brownell
+ * Copyright (C) 2003-2005 Alan Stern
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+
+/*
+ * This exposes a device side "USB gadget" API, driven by requests to a
+ * Linux-USB host controller driver. USB traffic is simulated; there's
+ * no need for USB hardware. Use this with two other drivers:
+ *
+ * - Gadget driver, responding to requests (slave);
+ * - Host-side device driver, as already familiar in Linux.
+ *
+ * Having this all in one kernel can help some stages of development,
+ * bypassing some hardware (and driver) issues. UML could help too.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/usb.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/hcd.h>
+#include <linux/scatterlist.h>
+
+#include <asm/byteorder.h>
+#include <linux/io.h>
+#include <asm/irq.h>
+#include <asm/unaligned.h>
+
+#define DRIVER_DESC "USB Host+Gadget Emulator"
+#define DRIVER_VERSION "02 May 2005"
+
+#define POWER_BUDGET 500 /* in mA; use 8 for low-power port testing */
+
+static const char driver_name[] = "dummy_hcd";
+static const char driver_desc[] = "USB Host+Gadget Emulator";
+
+static const char gadget_name[] = "dummy_udc";
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("David Brownell");
+MODULE_LICENSE("GPL");
+
+struct dummy_hcd_module_parameters {
+ bool is_super_speed;
+ bool is_high_speed;
+ unsigned int num;
+};
+
+static struct dummy_hcd_module_parameters mod_data = {
+ .is_super_speed = false,
+ .is_high_speed = true,
+ .num = 1,
+};
+module_param_named(is_super_speed, mod_data.is_super_speed, bool, S_IRUGO);
+MODULE_PARM_DESC(is_super_speed, "true to simulate SuperSpeed connection");
+module_param_named(is_high_speed, mod_data.is_high_speed, bool, S_IRUGO);
+MODULE_PARM_DESC(is_high_speed, "true to simulate HighSpeed connection");
+module_param_named(num, mod_data.num, uint, S_IRUGO);
+MODULE_PARM_DESC(num, "number of emulated controllers");
+/*-------------------------------------------------------------------------*/
+
+/* gadget side driver data structres */
+struct dummy_ep {
+ struct list_head queue;
+ unsigned long last_io; /* jiffies timestamp */
+ struct usb_gadget *gadget;
+ const struct usb_endpoint_descriptor *desc;
+ struct usb_ep ep;
+ unsigned halted:1;
+ unsigned wedged:1;
+ unsigned already_seen:1;
+ unsigned setup_stage:1;
+ unsigned stream_en:1;
+};
+
+struct dummy_request {
+ struct list_head queue; /* ep's requests */
+ struct usb_request req;
+};
+
+static inline struct dummy_ep *usb_ep_to_dummy_ep(struct usb_ep *_ep)
+{
+ return container_of(_ep, struct dummy_ep, ep);
+}
+
+static inline struct dummy_request *usb_request_to_dummy_request
+ (struct usb_request *_req)
+{
+ return container_of(_req, struct dummy_request, req);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Every device has ep0 for control requests, plus up to 30 more endpoints,
+ * in one of two types:
+ *
+ * - Configurable: direction (in/out), type (bulk, iso, etc), and endpoint
+ * number can be changed. Names like "ep-a" are used for this type.
+ *
+ * - Fixed Function: in other cases. some characteristics may be mutable;
+ * that'd be hardware-specific. Names like "ep12out-bulk" are used.
+ *
+ * Gadget drivers are responsible for not setting up conflicting endpoint
+ * configurations, illegal or unsupported packet lengths, and so on.
+ */
+
+static const char ep0name[] = "ep0";
+
+static const char *const ep_name[] = {
+ ep0name, /* everyone has ep0 */
+
+ /* act like a pxa250: fifteen fixed function endpoints */
+ "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
+ "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
+ "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
+ "ep15in-int",
+
+ /* or like sa1100: two fixed function endpoints */
+ "ep1out-bulk", "ep2in-bulk",
+
+ /* and now some generic EPs so we have enough in multi config */
+ "ep3out", "ep4in", "ep5out", "ep6out", "ep7in", "ep8out", "ep9in",
+ "ep10out", "ep11out", "ep12in", "ep13out", "ep14in", "ep15out",
+};
+#define DUMMY_ENDPOINTS ARRAY_SIZE(ep_name)
+
+/*-------------------------------------------------------------------------*/
+
+#define FIFO_SIZE 64
+
+struct urbp {
+ struct urb *urb;
+ struct list_head urbp_list;
+ struct sg_mapping_iter miter;
+ u32 miter_started;
+};
+
+
+enum dummy_rh_state {
+ DUMMY_RH_RESET,
+ DUMMY_RH_SUSPENDED,
+ DUMMY_RH_RUNNING
+};
+
+struct dummy_hcd {
+ struct dummy *dum;
+ enum dummy_rh_state rh_state;
+ struct timer_list timer;
+ u32 port_status;
+ u32 old_status;
+ unsigned long re_timeout;
+
+ struct usb_device *udev;
+ struct list_head urbp_list;
+ u32 stream_en_ep;
+ u8 num_stream[30 / 2];
+
+ unsigned active:1;
+ unsigned old_active:1;
+ unsigned resuming:1;
+};
+
+struct dummy {
+ spinlock_t lock;
+
+ /*
+ * SLAVE/GADGET side support
+ */
+ struct dummy_ep ep[DUMMY_ENDPOINTS];
+ int address;
+ struct usb_gadget gadget;
+ struct usb_gadget_driver *driver;
+ struct dummy_request fifo_req;
+ u8 fifo_buf[FIFO_SIZE];
+ u16 devstatus;
+ unsigned udc_suspended:1;
+ unsigned pullup:1;
+
+ /*
+ * MASTER/HOST side support
+ */
+ struct dummy_hcd *hs_hcd;
+ struct dummy_hcd *ss_hcd;
+};
+
+static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd)
+{
+ return (struct dummy_hcd *) (hcd->hcd_priv);
+}
+
+static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum)
+{
+ return container_of((void *) dum, struct usb_hcd, hcd_priv);
+}
+
+static inline struct device *dummy_dev(struct dummy_hcd *dum)
+{
+ return dummy_hcd_to_hcd(dum)->self.controller;
+}
+
+static inline struct device *udc_dev(struct dummy *dum)
+{
+ return dum->gadget.dev.parent;
+}
+
+static inline struct dummy *ep_to_dummy(struct dummy_ep *ep)
+{
+ return container_of(ep->gadget, struct dummy, gadget);
+}
+
+static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget)
+{
+ struct dummy *dum = container_of(gadget, struct dummy, gadget);
+ if (dum->gadget.speed == USB_SPEED_SUPER)
+ return dum->ss_hcd;
+ else
+ return dum->hs_hcd;
+}
+
+static inline struct dummy *gadget_dev_to_dummy(struct device *dev)
+{
+ return container_of(dev, struct dummy, gadget.dev);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* SLAVE/GADGET SIDE UTILITY ROUTINES */
+
+/* called with spinlock held */
+static void nuke(struct dummy *dum, struct dummy_ep *ep)
+{
+ while (!list_empty(&ep->queue)) {
+ struct dummy_request *req;
+
+ req = list_entry(ep->queue.next, struct dummy_request, queue);
+ list_del_init(&req->queue);
+ req->req.status = -ESHUTDOWN;
+
+ spin_unlock(&dum->lock);
+ usb_gadget_giveback_request(&ep->ep, &req->req);
+ spin_lock(&dum->lock);
+ }
+}
+
+/* caller must hold lock */
+static void stop_activity(struct dummy *dum)
+{
+ struct dummy_ep *ep;
+
+ /* prevent any more requests */
+ dum->address = 0;
+
+ /* The timer is left running so that outstanding URBs can fail */
+
+ /* nuke any pending requests first, so driver i/o is quiesced */
+ list_for_each_entry(ep, &dum->gadget.ep_list, ep.ep_list)
+ nuke(dum, ep);
+
+ /* driver now does any non-usb quiescing necessary */
+}
+
+/**
+ * set_link_state_by_speed() - Sets the current state of the link according to
+ * the hcd speed
+ * @dum_hcd: pointer to the dummy_hcd structure to update the link state for
+ *
+ * This function updates the port_status according to the link state and the
+ * speed of the hcd.
+ */
+static void set_link_state_by_speed(struct dummy_hcd *dum_hcd)
+{
+ struct dummy *dum = dum_hcd->dum;
+
+ if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) {
+ if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) == 0) {
+ dum_hcd->port_status = 0;
+ } else if (!dum->pullup || dum->udc_suspended) {
+ /* UDC suspend must cause a disconnect */
+ dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
+ USB_PORT_STAT_ENABLE);
+ if ((dum_hcd->old_status &
+ USB_PORT_STAT_CONNECTION) != 0)
+ dum_hcd->port_status |=
+ (USB_PORT_STAT_C_CONNECTION << 16);
+ } else {
+ /* device is connected and not suspended */
+ dum_hcd->port_status |= (USB_PORT_STAT_CONNECTION |
+ USB_PORT_STAT_SPEED_5GBPS) ;
+ if ((dum_hcd->old_status &
+ USB_PORT_STAT_CONNECTION) == 0)
+ dum_hcd->port_status |=
+ (USB_PORT_STAT_C_CONNECTION << 16);
+ if ((dum_hcd->port_status &
+ USB_PORT_STAT_ENABLE) == 1 &&
+ (dum_hcd->port_status &
+ USB_SS_PORT_LS_U0) == 1 &&
+ dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
+ dum_hcd->active = 1;
+ }
+ } else {
+ if ((dum_hcd->port_status & USB_PORT_STAT_POWER) == 0) {
+ dum_hcd->port_status = 0;
+ } else if (!dum->pullup || dum->udc_suspended) {
+ /* UDC suspend must cause a disconnect */
+ dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
+ USB_PORT_STAT_ENABLE |
+ USB_PORT_STAT_LOW_SPEED |
+ USB_PORT_STAT_HIGH_SPEED |
+ USB_PORT_STAT_SUSPEND);
+ if ((dum_hcd->old_status &
+ USB_PORT_STAT_CONNECTION) != 0)
+ dum_hcd->port_status |=
+ (USB_PORT_STAT_C_CONNECTION << 16);
+ } else {
+ dum_hcd->port_status |= USB_PORT_STAT_CONNECTION;
+ if ((dum_hcd->old_status &
+ USB_PORT_STAT_CONNECTION) == 0)
+ dum_hcd->port_status |=
+ (USB_PORT_STAT_C_CONNECTION << 16);
+ if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0)
+ dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
+ else if ((dum_hcd->port_status &
+ USB_PORT_STAT_SUSPEND) == 0 &&
+ dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
+ dum_hcd->active = 1;
+ }
+ }
+}
+
+/* caller must hold lock */
+static void set_link_state(struct dummy_hcd *dum_hcd)
+{
+ struct dummy *dum = dum_hcd->dum;
+
+ dum_hcd->active = 0;
+ if (dum->pullup)
+ if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 &&
+ dum->gadget.speed != USB_SPEED_SUPER) ||
+ (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 &&
+ dum->gadget.speed == USB_SPEED_SUPER))
+ return;
+
+ set_link_state_by_speed(dum_hcd);
+
+ if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 ||
+ dum_hcd->active)
+ dum_hcd->resuming = 0;
+
+ /* Currently !connected or in reset */
+ if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
+ (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) {
+ unsigned disconnect = USB_PORT_STAT_CONNECTION &
+ dum_hcd->old_status & (~dum_hcd->port_status);
+ unsigned reset = USB_PORT_STAT_RESET &
+ (~dum_hcd->old_status) & dum_hcd->port_status;
+
+ /* Report reset and disconnect events to the driver */
+ if (dum->driver && (disconnect || reset)) {
+ stop_activity(dum);
+ spin_unlock(&dum->lock);
+ if (reset)
+ usb_gadget_udc_reset(&dum->gadget, dum->driver);
+ else
+ dum->driver->disconnect(&dum->gadget);
+ spin_lock(&dum->lock);
+ }
+ } else if (dum_hcd->active != dum_hcd->old_active) {
+ if (dum_hcd->old_active && dum->driver->suspend) {
+ spin_unlock(&dum->lock);
+ dum->driver->suspend(&dum->gadget);
+ spin_lock(&dum->lock);
+ } else if (!dum_hcd->old_active && dum->driver->resume) {
+ spin_unlock(&dum->lock);
+ dum->driver->resume(&dum->gadget);
+ spin_lock(&dum->lock);
+ }
+ }
+
+ dum_hcd->old_status = dum_hcd->port_status;
+ dum_hcd->old_active = dum_hcd->active;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* SLAVE/GADGET SIDE DRIVER
+ *
+ * This only tracks gadget state. All the work is done when the host
+ * side tries some (emulated) i/o operation. Real device controller
+ * drivers would do real i/o using dma, fifos, irqs, timers, etc.
+ */
+
+#define is_enabled(dum) \
+ (dum->port_status & USB_PORT_STAT_ENABLE)
+
+static int dummy_enable(struct usb_ep *_ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ struct dummy *dum;
+ struct dummy_hcd *dum_hcd;
+ struct dummy_ep *ep;
+ unsigned max;
+ int retval;
+
+ ep = usb_ep_to_dummy_ep(_ep);
+ if (!_ep || !desc || ep->desc || _ep->name == ep0name
+ || desc->bDescriptorType != USB_DT_ENDPOINT)
+ return -EINVAL;
+ dum = ep_to_dummy(ep);
+ if (!dum->driver)
+ return -ESHUTDOWN;
+
+ dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
+ if (!is_enabled(dum_hcd))
+ return -ESHUTDOWN;
+
+ /*
+ * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the
+ * maximum packet size.
+ * For SS devices the wMaxPacketSize is limited by 1024.
+ */
+ max = usb_endpoint_maxp(desc) & 0x7ff;
+
+ /* drivers must not request bad settings, since lower levels
+ * (hardware or its drivers) may not check. some endpoints
+ * can't do iso, many have maxpacket limitations, etc.
+ *
+ * since this "hardware" driver is here to help debugging, we
+ * have some extra sanity checks. (there could be more though,
+ * especially for "ep9out" style fixed function ones.)
+ */
+ retval = -EINVAL;
+ switch (usb_endpoint_type(desc)) {
+ case USB_ENDPOINT_XFER_BULK:
+ if (strstr(ep->ep.name, "-iso")
+ || strstr(ep->ep.name, "-int")) {
+ goto done;
+ }
+ switch (dum->gadget.speed) {
+ case USB_SPEED_SUPER:
+ if (max == 1024)
+ break;
+ goto done;
+ case USB_SPEED_HIGH:
+ if (max == 512)
+ break;
+ goto done;
+ case USB_SPEED_FULL:
+ if (max == 8 || max == 16 || max == 32 || max == 64)
+ /* we'll fake any legal size */
+ break;
+ /* save a return statement */
+ default:
+ goto done;
+ }
+ break;
+ case USB_ENDPOINT_XFER_INT:
+ if (strstr(ep->ep.name, "-iso")) /* bulk is ok */
+ goto done;
+ /* real hardware might not handle all packet sizes */
+ switch (dum->gadget.speed) {
+ case USB_SPEED_SUPER:
+ case USB_SPEED_HIGH:
+ if (max <= 1024)
+ break;
+ /* save a return statement */
+ case USB_SPEED_FULL:
+ if (max <= 64)
+ break;
+ /* save a return statement */
+ default:
+ if (max <= 8)
+ break;
+ goto done;
+ }
+ break;
+ case USB_ENDPOINT_XFER_ISOC:
+ if (strstr(ep->ep.name, "-bulk")
+ || strstr(ep->ep.name, "-int"))
+ goto done;
+ /* real hardware might not handle all packet sizes */
+ switch (dum->gadget.speed) {
+ case USB_SPEED_SUPER:
+ case USB_SPEED_HIGH:
+ if (max <= 1024)
+ break;
+ /* save a return statement */
+ case USB_SPEED_FULL:
+ if (max <= 1023)
+ break;
+ /* save a return statement */
+ default:
+ goto done;
+ }
+ break;
+ default:
+ /* few chips support control except on ep0 */
+ goto done;
+ }
+
+ _ep->maxpacket = max;
+ if (usb_ss_max_streams(_ep->comp_desc)) {
+ if (!usb_endpoint_xfer_bulk(desc)) {
+ dev_err(udc_dev(dum), "Can't enable stream support on "
+ "non-bulk ep %s\n", _ep->name);
+ return -EINVAL;
+ }
+ ep->stream_en = 1;
+ }
+ ep->desc = desc;
+
+ dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n",
+ _ep->name,
+ desc->bEndpointAddress & 0x0f,
+ (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
+ ({ char *val;
+ switch (usb_endpoint_type(desc)) {
+ case USB_ENDPOINT_XFER_BULK:
+ val = "bulk";
+ break;
+ case USB_ENDPOINT_XFER_ISOC:
+ val = "iso";
+ break;
+ case USB_ENDPOINT_XFER_INT:
+ val = "intr";
+ break;
+ default:
+ val = "ctrl";
+ break;
+ } val; }),
+ max, ep->stream_en ? "enabled" : "disabled");
+
+ /* at this point real hardware should be NAKing transfers
+ * to that endpoint, until a buffer is queued to it.
+ */
+ ep->halted = ep->wedged = 0;
+ retval = 0;
+done:
+ return retval;
+}
+
+static int dummy_disable(struct usb_ep *_ep)
+{
+ struct dummy_ep *ep;
+ struct dummy *dum;
+ unsigned long flags;
+
+ ep = usb_ep_to_dummy_ep(_ep);
+ if (!_ep || !ep->desc || _ep->name == ep0name)
+ return -EINVAL;
+ dum = ep_to_dummy(ep);
+
+ spin_lock_irqsave(&dum->lock, flags);
+ ep->desc = NULL;
+ ep->stream_en = 0;
+ nuke(dum, ep);
+ spin_unlock_irqrestore(&dum->lock, flags);
+
+ dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name);
+ return 0;
+}
+
+static struct usb_request *dummy_alloc_request(struct usb_ep *_ep,
+ gfp_t mem_flags)
+{
+ struct dummy_ep *ep;
+ struct dummy_request *req;
+
+ if (!_ep)
+ return NULL;
+ ep = usb_ep_to_dummy_ep(_ep);
+
+ req = kzalloc(sizeof(*req), mem_flags);
+ if (!req)
+ return NULL;
+ INIT_LIST_HEAD(&req->queue);
+ return &req->req;
+}
+
+static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req)
+{
+ struct dummy_request *req;
+
+ if (!_ep || !_req) {
+ WARN_ON(1);
+ return;
+ }
+
+ req = usb_request_to_dummy_request(_req);
+ WARN_ON(!list_empty(&req->queue));
+ kfree(req);
+}
+
+static void fifo_complete(struct usb_ep *ep, struct usb_request *req)
+{
+}
+
+static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req,
+ gfp_t mem_flags)
+{
+ struct dummy_ep *ep;
+ struct dummy_request *req;
+ struct dummy *dum;
+ struct dummy_hcd *dum_hcd;
+ unsigned long flags;
+
+ req = usb_request_to_dummy_request(_req);
+ if (!_req || !list_empty(&req->queue) || !_req->complete)
+ return -EINVAL;
+
+ ep = usb_ep_to_dummy_ep(_ep);
+ if (!_ep || (!ep->desc && _ep->name != ep0name))
+ return -EINVAL;
+
+ dum = ep_to_dummy(ep);
+ dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
+ if (!dum->driver || !is_enabled(dum_hcd))
+ return -ESHUTDOWN;
+
+#if 0
+ dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
+ ep, _req, _ep->name, _req->length, _req->buf);
+#endif
+ _req->status = -EINPROGRESS;
+ _req->actual = 0;
+ spin_lock_irqsave(&dum->lock, flags);
+
+ /* implement an emulated single-request FIFO */
+ if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
+ list_empty(&dum->fifo_req.queue) &&
+ list_empty(&ep->queue) &&
+ _req->length <= FIFO_SIZE) {
+ req = &dum->fifo_req;
+ req->req = *_req;
+ req->req.buf = dum->fifo_buf;
+ memcpy(dum->fifo_buf, _req->buf, _req->length);
+ req->req.context = dum;
+ req->req.complete = fifo_complete;
+
+ list_add_tail(&req->queue, &ep->queue);
+ spin_unlock(&dum->lock);
+ _req->actual = _req->length;
+ _req->status = 0;
+ usb_gadget_giveback_request(_ep, _req);
+ spin_lock(&dum->lock);
+ } else
+ list_add_tail(&req->queue, &ep->queue);
+ spin_unlock_irqrestore(&dum->lock, flags);
+
+ /* real hardware would likely enable transfers here, in case
+ * it'd been left NAKing.
+ */
+ return 0;
+}
+
+static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+ struct dummy_ep *ep;
+ struct dummy *dum;
+ int retval = -EINVAL;
+ unsigned long flags;
+ struct dummy_request *req = NULL;
+
+ if (!_ep || !_req)
+ return retval;
+ ep = usb_ep_to_dummy_ep(_ep);
+ dum = ep_to_dummy(ep);
+
+ if (!dum->driver)
+ return -ESHUTDOWN;
+
+ local_irq_save(flags);
+ spin_lock(&dum->lock);
+ list_for_each_entry(req, &ep->queue, queue) {
+ if (&req->req == _req) {
+ list_del_init(&req->queue);
+ _req->status = -ECONNRESET;
+ retval = 0;
+ break;
+ }
+ }
+ spin_unlock(&dum->lock);
+
+ if (retval == 0) {
+ dev_dbg(udc_dev(dum),
+ "dequeued req %p from %s, len %d buf %p\n",
+ req, _ep->name, _req->length, _req->buf);
+ usb_gadget_giveback_request(_ep, _req);
+ }
+ local_irq_restore(flags);
+ return retval;
+}
+
+static int
+dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
+{
+ struct dummy_ep *ep;
+ struct dummy *dum;
+
+ if (!_ep)
+ return -EINVAL;
+ ep = usb_ep_to_dummy_ep(_ep);
+ dum = ep_to_dummy(ep);
+ if (!dum->driver)
+ return -ESHUTDOWN;
+ if (!value)
+ ep->halted = ep->wedged = 0;
+ else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
+ !list_empty(&ep->queue))
+ return -EAGAIN;
+ else {
+ ep->halted = 1;
+ if (wedged)
+ ep->wedged = 1;
+ }
+ /* FIXME clear emulated data toggle too */
+ return 0;
+}
+
+static int
+dummy_set_halt(struct usb_ep *_ep, int value)
+{
+ return dummy_set_halt_and_wedge(_ep, value, 0);
+}
+
+static int dummy_set_wedge(struct usb_ep *_ep)
+{
+ if (!_ep || _ep->name == ep0name)
+ return -EINVAL;
+ return dummy_set_halt_and_wedge(_ep, 1, 1);
+}
+
+static const struct usb_ep_ops dummy_ep_ops = {
+ .enable = dummy_enable,
+ .disable = dummy_disable,
+
+ .alloc_request = dummy_alloc_request,
+ .free_request = dummy_free_request,
+
+ .queue = dummy_queue,
+ .dequeue = dummy_dequeue,
+
+ .set_halt = dummy_set_halt,
+ .set_wedge = dummy_set_wedge,
+};
+
+/*-------------------------------------------------------------------------*/
+
+/* there are both host and device side versions of this call ... */
+static int dummy_g_get_frame(struct usb_gadget *_gadget)
+{
+ struct timeval tv;
+
+ do_gettimeofday(&tv);
+ return tv.tv_usec / 1000;
+}
+
+static int dummy_wakeup(struct usb_gadget *_gadget)
+{
+ struct dummy_hcd *dum_hcd;
+
+ dum_hcd = gadget_to_dummy_hcd(_gadget);
+ if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE)
+ | (1 << USB_DEVICE_REMOTE_WAKEUP))))
+ return -EINVAL;
+ if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0)
+ return -ENOLINK;
+ if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
+ dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
+ return -EIO;
+
+ /* FIXME: What if the root hub is suspended but the port isn't? */
+
+ /* hub notices our request, issues downstream resume, etc */
+ dum_hcd->resuming = 1;
+ dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
+ mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout);
+ return 0;
+}
+
+static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value)
+{
+ struct dummy *dum;
+
+ _gadget->is_selfpowered = (value != 0);
+ dum = gadget_to_dummy_hcd(_gadget)->dum;
+ if (value)
+ dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
+ else
+ dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
+ return 0;
+}
+
+static void dummy_udc_update_ep0(struct dummy *dum)
+{
+ if (dum->gadget.speed == USB_SPEED_SUPER)
+ dum->ep[0].ep.maxpacket = 9;
+ else
+ dum->ep[0].ep.maxpacket = 64;
+}
+
+static int dummy_pullup(struct usb_gadget *_gadget, int value)
+{
+ struct dummy_hcd *dum_hcd;
+ struct dummy *dum;
+ unsigned long flags;
+
+ dum = gadget_dev_to_dummy(&_gadget->dev);
+
+ if (value && dum->driver) {
+ if (mod_data.is_super_speed)
+ dum->gadget.speed = dum->driver->max_speed;
+ else if (mod_data.is_high_speed)
+ dum->gadget.speed = min_t(u8, USB_SPEED_HIGH,
+ dum->driver->max_speed);
+ else
+ dum->gadget.speed = USB_SPEED_FULL;
+ dummy_udc_update_ep0(dum);
+
+ if (dum->gadget.speed < dum->driver->max_speed)
+ dev_dbg(udc_dev(dum), "This device can perform faster"
+ " if you connect it to a %s port...\n",
+ usb_speed_string(dum->driver->max_speed));
+ }
+ dum_hcd = gadget_to_dummy_hcd(_gadget);
+
+ spin_lock_irqsave(&dum->lock, flags);
+ dum->pullup = (value != 0);
+ set_link_state(dum_hcd);
+ spin_unlock_irqrestore(&dum->lock, flags);
+
+ usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
+ return 0;
+}
+
+static int dummy_udc_start(struct usb_gadget *g,
+ struct usb_gadget_driver *driver);
+static int dummy_udc_stop(struct usb_gadget *g);
+
+static const struct usb_gadget_ops dummy_ops = {
+ .get_frame = dummy_g_get_frame,
+ .wakeup = dummy_wakeup,
+ .set_selfpowered = dummy_set_selfpowered,
+ .pullup = dummy_pullup,
+ .udc_start = dummy_udc_start,
+ .udc_stop = dummy_udc_stop,
+};
+
+/*-------------------------------------------------------------------------*/
+
+/* "function" sysfs attribute */
+static ssize_t function_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct dummy *dum = gadget_dev_to_dummy(dev);
+
+ if (!dum->driver || !dum->driver->function)
+ return 0;
+ return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function);
+}
+static DEVICE_ATTR_RO(function);
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Driver registration/unregistration.
+ *
+ * This is basically hardware-specific; there's usually only one real USB
+ * device (not host) controller since that's how USB devices are intended
+ * to work. So most implementations of these api calls will rely on the
+ * fact that only one driver will ever bind to the hardware. But curious
+ * hardware can be built with discrete components, so the gadget API doesn't
+ * require that assumption.
+ *
+ * For this emulator, it might be convenient to create a usb slave device
+ * for each driver that registers: just add to a big root hub.
+ */
+
+static int dummy_udc_start(struct usb_gadget *g,
+ struct usb_gadget_driver *driver)
+{
+ struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g);
+ struct dummy *dum = dum_hcd->dum;
+
+ if (driver->max_speed == USB_SPEED_UNKNOWN)
+ return -EINVAL;
+
+ /*
+ * SLAVE side init ... the layer above hardware, which
+ * can't enumerate without help from the driver we're binding.
+ */
+
+ dum->devstatus = 0;
+ dum->driver = driver;
+
+ return 0;
+}
+
+static int dummy_udc_stop(struct usb_gadget *g)
+{
+ struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g);
+ struct dummy *dum = dum_hcd->dum;
+
+ dum->driver = NULL;
+
+ return 0;
+}
+
+#undef is_enabled
+
+/* The gadget structure is stored inside the hcd structure and will be
+ * released along with it. */
+static void init_dummy_udc_hw(struct dummy *dum)
+{
+ int i;
+
+ INIT_LIST_HEAD(&dum->gadget.ep_list);
+ for (i = 0; i < DUMMY_ENDPOINTS; i++) {
+ struct dummy_ep *ep = &dum->ep[i];
+
+ if (!ep_name[i])
+ break;
+ ep->ep.name = ep_name[i];
+ ep->ep.ops = &dummy_ep_ops;
+ list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list);
+ ep->halted = ep->wedged = ep->already_seen =
+ ep->setup_stage = 0;
+ usb_ep_set_maxpacket_limit(&ep->ep, ~0);
+ ep->ep.max_streams = 16;
+ ep->last_io = jiffies;
+ ep->gadget = &dum->gadget;
+ ep->desc = NULL;
+ INIT_LIST_HEAD(&ep->queue);
+ }
+
+ dum->gadget.ep0 = &dum->ep[0].ep;
+ list_del_init(&dum->ep[0].ep.ep_list);
+ INIT_LIST_HEAD(&dum->fifo_req.queue);
+
+#ifdef CONFIG_USB_OTG
+ dum->gadget.is_otg = 1;
+#endif
+}
+
+static int dummy_udc_probe(struct platform_device *pdev)
+{
+ struct dummy *dum;
+ int rc;
+
+ dum = *((void **)dev_get_platdata(&pdev->dev));
+ dum->gadget.name = gadget_name;
+ dum->gadget.ops = &dummy_ops;
+ dum->gadget.max_speed = USB_SPEED_SUPER;
+
+ dum->gadget.dev.parent = &pdev->dev;
+ init_dummy_udc_hw(dum);
+
+ rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget);
+ if (rc < 0)
+ goto err_udc;
+
+ rc = device_create_file(&dum->gadget.dev, &dev_attr_function);
+ if (rc < 0)
+ goto err_dev;
+ platform_set_drvdata(pdev, dum);
+ return rc;
+
+err_dev:
+ usb_del_gadget_udc(&dum->gadget);
+err_udc:
+ return rc;
+}
+
+static int dummy_udc_remove(struct platform_device *pdev)
+{
+ struct dummy *dum = platform_get_drvdata(pdev);
+
+ device_remove_file(&dum->gadget.dev, &dev_attr_function);
+ usb_del_gadget_udc(&dum->gadget);
+ return 0;
+}
+
+static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd,
+ int suspend)
+{
+ spin_lock_irq(&dum->lock);
+ dum->udc_suspended = suspend;
+ set_link_state(dum_hcd);
+ spin_unlock_irq(&dum->lock);
+}
+
+static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct dummy *dum = platform_get_drvdata(pdev);
+ struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
+
+ dev_dbg(&pdev->dev, "%s\n", __func__);
+ dummy_udc_pm(dum, dum_hcd, 1);
+ usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
+ return 0;
+}
+
+static int dummy_udc_resume(struct platform_device *pdev)
+{
+ struct dummy *dum = platform_get_drvdata(pdev);
+ struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
+
+ dev_dbg(&pdev->dev, "%s\n", __func__);
+ dummy_udc_pm(dum, dum_hcd, 0);
+ usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
+ return 0;
+}
+
+static struct platform_driver dummy_udc_driver = {
+ .probe = dummy_udc_probe,
+ .remove = dummy_udc_remove,
+ .suspend = dummy_udc_suspend,
+ .resume = dummy_udc_resume,
+ .driver = {
+ .name = (char *) gadget_name,
+ },
+};
+
+/*-------------------------------------------------------------------------*/
+
+static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc)
+{
+ unsigned int index;
+
+ index = usb_endpoint_num(desc) << 1;
+ if (usb_endpoint_dir_in(desc))
+ index |= 1;
+ return index;
+}
+
+/* MASTER/HOST SIDE DRIVER
+ *
+ * this uses the hcd framework to hook up to host side drivers.
+ * its root hub will only have one device, otherwise it acts like
+ * a normal host controller.
+ *
+ * when urbs are queued, they're just stuck on a list that we
+ * scan in a timer callback. that callback connects writes from
+ * the host with reads from the device, and so on, based on the
+ * usb 2.0 rules.
+ */
+
+static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb)
+{
+ const struct usb_endpoint_descriptor *desc = &urb->ep->desc;
+ u32 index;
+
+ if (!usb_endpoint_xfer_bulk(desc))
+ return 0;
+
+ index = dummy_get_ep_idx(desc);
+ return (1 << index) & dum_hcd->stream_en_ep;
+}
+
+/*
+ * The max stream number is saved as a nibble so for the 30 possible endpoints
+ * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0
+ * means we use only 1 stream). The maximum according to the spec is 16bit so
+ * if the 16 stream limit is about to go, the array size should be incremented
+ * to 30 elements of type u16.
+ */
+static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
+ unsigned int pipe)
+{
+ int max_streams;
+
+ max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
+ if (usb_pipeout(pipe))
+ max_streams >>= 4;
+ else
+ max_streams &= 0xf;
+ max_streams++;
+ return max_streams;
+}
+
+static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
+ unsigned int pipe, unsigned int streams)
+{
+ int max_streams;
+
+ streams--;
+ max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
+ if (usb_pipeout(pipe)) {
+ streams <<= 4;
+ max_streams &= 0xf;
+ } else {
+ max_streams &= 0xf0;
+ }
+ max_streams |= streams;
+ dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams;
+}
+
+static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb)
+{
+ unsigned int max_streams;
+ int enabled;
+
+ enabled = dummy_ep_stream_en(dum_hcd, urb);
+ if (!urb->stream_id) {
+ if (enabled)
+ return -EINVAL;
+ return 0;
+ }
+ if (!enabled)
+ return -EINVAL;
+
+ max_streams = get_max_streams_for_pipe(dum_hcd,
+ usb_pipeendpoint(urb->pipe));
+ if (urb->stream_id > max_streams) {
+ dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n",
+ urb->stream_id);
+ BUG();
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int dummy_urb_enqueue(
+ struct usb_hcd *hcd,
+ struct urb *urb,
+ gfp_t mem_flags
+) {
+ struct dummy_hcd *dum_hcd;
+ struct urbp *urbp;
+ unsigned long flags;
+ int rc;
+
+ urbp = kmalloc(sizeof *urbp, mem_flags);
+ if (!urbp)
+ return -ENOMEM;
+ urbp->urb = urb;
+ urbp->miter_started = 0;
+
+ dum_hcd = hcd_to_dummy_hcd(hcd);
+ spin_lock_irqsave(&dum_hcd->dum->lock, flags);
+
+ rc = dummy_validate_stream(dum_hcd, urb);
+ if (rc) {
+ kfree(urbp);
+ goto done;
+ }
+
+ rc = usb_hcd_link_urb_to_ep(hcd, urb);
+ if (rc) {
+ kfree(urbp);
+ goto done;
+ }
+
+ if (!dum_hcd->udev) {
+ dum_hcd->udev = urb->dev;
+ usb_get_dev(dum_hcd->udev);
+ } else if (unlikely(dum_hcd->udev != urb->dev))
+ dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n");
+
+ list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list);
+ urb->hcpriv = urbp;
+ if (usb_pipetype(urb->pipe) == PIPE_CONTROL)
+ urb->error_count = 1; /* mark as a new urb */
+
+ /* kick the scheduler, it'll do the rest */
+ if (!timer_pending(&dum_hcd->timer))
+ mod_timer(&dum_hcd->timer, jiffies + 1);
+
+ done:
+ spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
+ return rc;
+}
+
+static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
+{
+ struct dummy_hcd *dum_hcd;
+ unsigned long flags;
+ int rc;
+
+ /* giveback happens automatically in timer callback,
+ * so make sure the callback happens */
+ dum_hcd = hcd_to_dummy_hcd(hcd);
+ spin_lock_irqsave(&dum_hcd->dum->lock, flags);
+
+ rc = usb_hcd_check_unlink_urb(hcd, urb, status);
+ if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING &&
+ !list_empty(&dum_hcd->urbp_list))
+ mod_timer(&dum_hcd->timer, jiffies);
+
+ spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
+ return rc;
+}
+
+static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req,
+ u32 len)
+{
+ void *ubuf, *rbuf;
+ struct urbp *urbp = urb->hcpriv;
+ int to_host;
+ struct sg_mapping_iter *miter = &urbp->miter;
+ u32 trans = 0;
+ u32 this_sg;
+ bool next_sg;
+
+ to_host = usb_pipein(urb->pipe);
+ rbuf = req->req.buf + req->req.actual;
+
+ if (!urb->num_sgs) {
+ ubuf = urb->transfer_buffer + urb->actual_length;
+ if (to_host)
+ memcpy(ubuf, rbuf, len);
+ else
+ memcpy(rbuf, ubuf, len);
+ return len;
+ }
+
+ if (!urbp->miter_started) {
+ u32 flags = SG_MITER_ATOMIC;
+
+ if (to_host)
+ flags |= SG_MITER_TO_SG;
+ else
+ flags |= SG_MITER_FROM_SG;
+
+ sg_miter_start(miter, urb->sg, urb->num_sgs, flags);
+ urbp->miter_started = 1;
+ }
+ next_sg = sg_miter_next(miter);
+ if (next_sg == false) {
+ WARN_ON_ONCE(1);
+ return -EINVAL;
+ }
+ do {
+ ubuf = miter->addr;
+ this_sg = min_t(u32, len, miter->length);
+ miter->consumed = this_sg;
+ trans += this_sg;
+
+ if (to_host)
+ memcpy(ubuf, rbuf, this_sg);
+ else
+ memcpy(rbuf, ubuf, this_sg);
+ len -= this_sg;
+
+ if (!len)
+ break;
+ next_sg = sg_miter_next(miter);
+ if (next_sg == false) {
+ WARN_ON_ONCE(1);
+ return -EINVAL;
+ }
+
+ rbuf += this_sg;
+ } while (1);
+
+ sg_miter_stop(miter);
+ return trans;
+}
+
+/* transfer up to a frame's worth; caller must own lock */
+static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb,
+ struct dummy_ep *ep, int limit, int *status)
+{
+ struct dummy *dum = dum_hcd->dum;
+ struct dummy_request *req;
+
+top:
+ /* if there's no request queued, the device is NAKing; return */
+ list_for_each_entry(req, &ep->queue, queue) {
+ unsigned host_len, dev_len, len;
+ int is_short, to_host;
+ int rescan = 0;
+
+ if (dummy_ep_stream_en(dum_hcd, urb)) {
+ if ((urb->stream_id != req->req.stream_id))
+ continue;
+ }
+
+ /* 1..N packets of ep->ep.maxpacket each ... the last one
+ * may be short (including zero length).
+ *
+ * writer can send a zlp explicitly (length 0) or implicitly
+ * (length mod maxpacket zero, and 'zero' flag); they always
+ * terminate reads.
+ */
+ host_len = urb->transfer_buffer_length - urb->actual_length;
+ dev_len = req->req.length - req->req.actual;
+ len = min(host_len, dev_len);
+
+ /* FIXME update emulated data toggle too */
+
+ to_host = usb_pipein(urb->pipe);
+ if (unlikely(len == 0))
+ is_short = 1;
+ else {
+ /* not enough bandwidth left? */
+ if (limit < ep->ep.maxpacket && limit < len)
+ break;
+ len = min_t(unsigned, len, limit);
+ if (len == 0)
+ break;
+
+ /* use an extra pass for the final short packet */
+ if (len > ep->ep.maxpacket) {
+ rescan = 1;
+ len -= (len % ep->ep.maxpacket);
+ }
+ is_short = (len % ep->ep.maxpacket) != 0;
+
+ len = dummy_perform_transfer(urb, req, len);
+
+ ep->last_io = jiffies;
+ if ((int)len < 0) {
+ req->req.status = len;
+ } else {
+ limit -= len;
+ urb->actual_length += len;
+ req->req.actual += len;
+ }
+ }
+
+ /* short packets terminate, maybe with overflow/underflow.
+ * it's only really an error to write too much.
+ *
+ * partially filling a buffer optionally blocks queue advances
+ * (so completion handlers can clean up the queue) but we don't
+ * need to emulate such data-in-flight.
+ */
+ if (is_short) {
+ if (host_len == dev_len) {
+ req->req.status = 0;
+ *status = 0;
+ } else if (to_host) {
+ req->req.status = 0;
+ if (dev_len > host_len)
+ *status = -EOVERFLOW;
+ else
+ *status = 0;
+ } else if (!to_host) {
+ *status = 0;
+ if (host_len > dev_len)
+ req->req.status = -EOVERFLOW;
+ else
+ req->req.status = 0;
+ }
+
+ /* many requests terminate without a short packet */
+ } else {
+ if (req->req.length == req->req.actual
+ && !req->req.zero)
+ req->req.status = 0;
+ if (urb->transfer_buffer_length == urb->actual_length
+ && !(urb->transfer_flags
+ & URB_ZERO_PACKET))
+ *status = 0;
+ }
+
+ /* device side completion --> continuable */
+ if (req->req.status != -EINPROGRESS) {
+ list_del_init(&req->queue);
+
+ spin_unlock(&dum->lock);
+ usb_gadget_giveback_request(&ep->ep, &req->req);
+ spin_lock(&dum->lock);
+
+ /* requests might have been unlinked... */
+ rescan = 1;
+ }
+
+ /* host side completion --> terminate */
+ if (*status != -EINPROGRESS)
+ break;
+
+ /* rescan to continue with any other queued i/o */
+ if (rescan)
+ goto top;
+ }
+ return limit;
+}
+
+static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep)
+{
+ int limit = ep->ep.maxpacket;
+
+ if (dum->gadget.speed == USB_SPEED_HIGH) {
+ int tmp;
+
+ /* high bandwidth mode */
+ tmp = usb_endpoint_maxp(ep->desc);
+ tmp = (tmp >> 11) & 0x03;
+ tmp *= 8 /* applies to entire frame */;
+ limit += limit * tmp;
+ }
+ if (dum->gadget.speed == USB_SPEED_SUPER) {
+ switch (usb_endpoint_type(ep->desc)) {
+ case USB_ENDPOINT_XFER_ISOC:
+ /* Sec. 4.4.8.2 USB3.0 Spec */
+ limit = 3 * 16 * 1024 * 8;
+ break;
+ case USB_ENDPOINT_XFER_INT:
+ /* Sec. 4.4.7.2 USB3.0 Spec */
+ limit = 3 * 1024 * 8;
+ break;
+ case USB_ENDPOINT_XFER_BULK:
+ default:
+ break;
+ }
+ }
+ return limit;
+}
+
+#define is_active(dum_hcd) ((dum_hcd->port_status & \
+ (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
+ USB_PORT_STAT_SUSPEND)) \
+ == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
+
+static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address)
+{
+ int i;
+
+ if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ?
+ dum->ss_hcd : dum->hs_hcd)))
+ return NULL;
+ if ((address & ~USB_DIR_IN) == 0)
+ return &dum->ep[0];
+ for (i = 1; i < DUMMY_ENDPOINTS; i++) {
+ struct dummy_ep *ep = &dum->ep[i];
+
+ if (!ep->desc)
+ continue;
+ if (ep->desc->bEndpointAddress == address)
+ return ep;
+ }
+ return NULL;
+}
+
+#undef is_active
+
+#define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
+#define Dev_InRequest (Dev_Request | USB_DIR_IN)
+#define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
+#define Intf_InRequest (Intf_Request | USB_DIR_IN)
+#define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
+#define Ep_InRequest (Ep_Request | USB_DIR_IN)
+
+
+/**
+ * handle_control_request() - handles all control transfers
+ * @dum: pointer to dummy (the_controller)
+ * @urb: the urb request to handle
+ * @setup: pointer to the setup data for a USB device control
+ * request
+ * @status: pointer to request handling status
+ *
+ * Return 0 - if the request was handled
+ * 1 - if the request wasn't handles
+ * error code on error
+ */
+static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb,
+ struct usb_ctrlrequest *setup,
+ int *status)
+{
+ struct dummy_ep *ep2;
+ struct dummy *dum = dum_hcd->dum;
+ int ret_val = 1;
+ unsigned w_index;
+ unsigned w_value;
+
+ w_index = le16_to_cpu(setup->wIndex);
+ w_value = le16_to_cpu(setup->wValue);
+ switch (setup->bRequest) {
+ case USB_REQ_SET_ADDRESS:
+ if (setup->bRequestType != Dev_Request)
+ break;
+ dum->address = w_value;
+ *status = 0;
+ dev_dbg(udc_dev(dum), "set_address = %d\n",
+ w_value);
+ ret_val = 0;
+ break;
+ case USB_REQ_SET_FEATURE:
+ if (setup->bRequestType == Dev_Request) {
+ ret_val = 0;
+ switch (w_value) {
+ case USB_DEVICE_REMOTE_WAKEUP:
+ break;
+ case USB_DEVICE_B_HNP_ENABLE:
+ dum->gadget.b_hnp_enable = 1;
+ break;
+ case USB_DEVICE_A_HNP_SUPPORT:
+ dum->gadget.a_hnp_support = 1;
+ break;
+ case USB_DEVICE_A_ALT_HNP_SUPPORT:
+ dum->gadget.a_alt_hnp_support = 1;
+ break;
+ case USB_DEVICE_U1_ENABLE:
+ if (dummy_hcd_to_hcd(dum_hcd)->speed ==
+ HCD_USB3)
+ w_value = USB_DEV_STAT_U1_ENABLED;
+ else
+ ret_val = -EOPNOTSUPP;
+ break;
+ case USB_DEVICE_U2_ENABLE:
+ if (dummy_hcd_to_hcd(dum_hcd)->speed ==
+ HCD_USB3)
+ w_value = USB_DEV_STAT_U2_ENABLED;
+ else
+ ret_val = -EOPNOTSUPP;
+ break;
+ case USB_DEVICE_LTM_ENABLE:
+ if (dummy_hcd_to_hcd(dum_hcd)->speed ==
+ HCD_USB3)
+ w_value = USB_DEV_STAT_LTM_ENABLED;
+ else
+ ret_val = -EOPNOTSUPP;
+ break;
+ default:
+ ret_val = -EOPNOTSUPP;
+ }
+ if (ret_val == 0) {
+ dum->devstatus |= (1 << w_value);
+ *status = 0;
+ }
+ } else if (setup->bRequestType == Ep_Request) {
+ /* endpoint halt */
+ ep2 = find_endpoint(dum, w_index);
+ if (!ep2 || ep2->ep.name == ep0name) {
+ ret_val = -EOPNOTSUPP;
+ break;
+ }
+ ep2->halted = 1;
+ ret_val = 0;
+ *status = 0;
+ }
+ break;
+ case USB_REQ_CLEAR_FEATURE:
+ if (setup->bRequestType == Dev_Request) {
+ ret_val = 0;
+ switch (w_value) {
+ case USB_DEVICE_REMOTE_WAKEUP:
+ w_value = USB_DEVICE_REMOTE_WAKEUP;
+ break;
+ case USB_DEVICE_U1_ENABLE:
+ if (dummy_hcd_to_hcd(dum_hcd)->speed ==
+ HCD_USB3)
+ w_value = USB_DEV_STAT_U1_ENABLED;
+ else
+ ret_val = -EOPNOTSUPP;
+ break;
+ case USB_DEVICE_U2_ENABLE:
+ if (dummy_hcd_to_hcd(dum_hcd)->speed ==
+ HCD_USB3)
+ w_value = USB_DEV_STAT_U2_ENABLED;
+ else
+ ret_val = -EOPNOTSUPP;
+ break;
+ case USB_DEVICE_LTM_ENABLE:
+ if (dummy_hcd_to_hcd(dum_hcd)->speed ==
+ HCD_USB3)
+ w_value = USB_DEV_STAT_LTM_ENABLED;
+ else
+ ret_val = -EOPNOTSUPP;
+ break;
+ default:
+ ret_val = -EOPNOTSUPP;
+ break;
+ }
+ if (ret_val == 0) {
+ dum->devstatus &= ~(1 << w_value);
+ *status = 0;
+ }
+ } else if (setup->bRequestType == Ep_Request) {
+ /* endpoint halt */
+ ep2 = find_endpoint(dum, w_index);
+ if (!ep2) {
+ ret_val = -EOPNOTSUPP;
+ break;
+ }
+ if (!ep2->wedged)
+ ep2->halted = 0;
+ ret_val = 0;
+ *status = 0;
+ }
+ break;
+ case USB_REQ_GET_STATUS:
+ if (setup->bRequestType == Dev_InRequest
+ || setup->bRequestType == Intf_InRequest
+ || setup->bRequestType == Ep_InRequest) {
+ char *buf;
+ /*
+ * device: remote wakeup, selfpowered
+ * interface: nothing
+ * endpoint: halt
+ */
+ buf = (char *)urb->transfer_buffer;
+ if (urb->transfer_buffer_length > 0) {
+ if (setup->bRequestType == Ep_InRequest) {
+ ep2 = find_endpoint(dum, w_index);
+ if (!ep2) {
+ ret_val = -EOPNOTSUPP;
+ break;
+ }
+ buf[0] = ep2->halted;
+ } else if (setup->bRequestType ==
+ Dev_InRequest) {
+ buf[0] = (u8)dum->devstatus;
+ } else
+ buf[0] = 0;
+ }
+ if (urb->transfer_buffer_length > 1)
+ buf[1] = 0;
+ urb->actual_length = min_t(u32, 2,
+ urb->transfer_buffer_length);
+ ret_val = 0;
+ *status = 0;
+ }
+ break;
+ }
+ return ret_val;
+}
+
+/* drive both sides of the transfers; looks like irq handlers to
+ * both drivers except the callbacks aren't in_irq().
+ */
+static void dummy_timer(unsigned long _dum_hcd)
+{
+ struct dummy_hcd *dum_hcd = (struct dummy_hcd *) _dum_hcd;
+ struct dummy *dum = dum_hcd->dum;
+ struct urbp *urbp, *tmp;
+ unsigned long flags;
+ int limit, total;
+ int i;
+
+ /* simplistic model for one frame's bandwidth */
+ switch (dum->gadget.speed) {
+ case USB_SPEED_LOW:
+ total = 8/*bytes*/ * 12/*packets*/;
+ break;
+ case USB_SPEED_FULL:
+ total = 64/*bytes*/ * 19/*packets*/;
+ break;
+ case USB_SPEED_HIGH:
+ total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
+ break;
+ case USB_SPEED_SUPER:
+ /* Bus speed is 500000 bytes/ms, so use a little less */
+ total = 490000;
+ break;
+ default:
+ dev_err(dummy_dev(dum_hcd), "bogus device speed\n");
+ return;
+ }
+
+ /* FIXME if HZ != 1000 this will probably misbehave ... */
+
+ /* look at each urb queued by the host side driver */
+ spin_lock_irqsave(&dum->lock, flags);
+
+ if (!dum_hcd->udev) {
+ dev_err(dummy_dev(dum_hcd),
+ "timer fired with no URBs pending?\n");
+ spin_unlock_irqrestore(&dum->lock, flags);
+ return;
+ }
+
+ for (i = 0; i < DUMMY_ENDPOINTS; i++) {
+ if (!ep_name[i])
+ break;
+ dum->ep[i].already_seen = 0;
+ }
+
+restart:
+ list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) {
+ struct urb *urb;
+ struct dummy_request *req;
+ u8 address;
+ struct dummy_ep *ep = NULL;
+ int type;
+ int status = -EINPROGRESS;
+
+ urb = urbp->urb;
+ if (urb->unlinked)
+ goto return_urb;
+ else if (dum_hcd->rh_state != DUMMY_RH_RUNNING)
+ continue;
+ type = usb_pipetype(urb->pipe);
+
+ /* used up this frame's non-periodic bandwidth?
+ * FIXME there's infinite bandwidth for control and
+ * periodic transfers ... unrealistic.
+ */
+ if (total <= 0 && type == PIPE_BULK)
+ continue;
+
+ /* find the gadget's ep for this request (if configured) */
+ address = usb_pipeendpoint (urb->pipe);
+ if (usb_pipein(urb->pipe))
+ address |= USB_DIR_IN;
+ ep = find_endpoint(dum, address);
+ if (!ep) {
+ /* set_configuration() disagreement */
+ dev_dbg(dummy_dev(dum_hcd),
+ "no ep configured for urb %p\n",
+ urb);
+ status = -EPROTO;
+ goto return_urb;
+ }
+
+ if (ep->already_seen)
+ continue;
+ ep->already_seen = 1;
+ if (ep == &dum->ep[0] && urb->error_count) {
+ ep->setup_stage = 1; /* a new urb */
+ urb->error_count = 0;
+ }
+ if (ep->halted && !ep->setup_stage) {
+ /* NOTE: must not be iso! */
+ dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n",
+ ep->ep.name, urb);
+ status = -EPIPE;
+ goto return_urb;
+ }
+ /* FIXME make sure both ends agree on maxpacket */
+
+ /* handle control requests */
+ if (ep == &dum->ep[0] && ep->setup_stage) {
+ struct usb_ctrlrequest setup;
+ int value = 1;
+
+ setup = *(struct usb_ctrlrequest *) urb->setup_packet;
+ /* paranoia, in case of stale queued data */
+ list_for_each_entry(req, &ep->queue, queue) {
+ list_del_init(&req->queue);
+ req->req.status = -EOVERFLOW;
+ dev_dbg(udc_dev(dum), "stale req = %p\n",
+ req);
+
+ spin_unlock(&dum->lock);
+ usb_gadget_giveback_request(&ep->ep, &req->req);
+ spin_lock(&dum->lock);
+ ep->already_seen = 0;
+ goto restart;
+ }
+
+ /* gadget driver never sees set_address or operations
+ * on standard feature flags. some hardware doesn't
+ * even expose them.
+ */
+ ep->last_io = jiffies;
+ ep->setup_stage = 0;
+ ep->halted = 0;
+
+ value = handle_control_request(dum_hcd, urb, &setup,
+ &status);
+
+ /* gadget driver handles all other requests. block
+ * until setup() returns; no reentrancy issues etc.
+ */
+ if (value > 0) {
+ spin_unlock(&dum->lock);
+ value = dum->driver->setup(&dum->gadget,
+ &setup);
+ spin_lock(&dum->lock);
+
+ if (value >= 0) {
+ /* no delays (max 64KB data stage) */
+ limit = 64*1024;
+ goto treat_control_like_bulk;
+ }
+ /* error, see below */
+ }
+
+ if (value < 0) {
+ if (value != -EOPNOTSUPP)
+ dev_dbg(udc_dev(dum),
+ "setup --> %d\n",
+ value);
+ status = -EPIPE;
+ urb->actual_length = 0;
+ }
+
+ goto return_urb;
+ }
+
+ /* non-control requests */
+ limit = total;
+ switch (usb_pipetype(urb->pipe)) {
+ case PIPE_ISOCHRONOUS:
+ /* FIXME is it urb->interval since the last xfer?
+ * use urb->iso_frame_desc[i].
+ * complete whether or not ep has requests queued.
+ * report random errors, to debug drivers.
+ */
+ limit = max(limit, periodic_bytes(dum, ep));
+ status = -ENOSYS;
+ break;
+
+ case PIPE_INTERRUPT:
+ /* FIXME is it urb->interval since the last xfer?
+ * this almost certainly polls too fast.
+ */
+ limit = max(limit, periodic_bytes(dum, ep));
+ /* FALLTHROUGH */
+
+ default:
+treat_control_like_bulk:
+ ep->last_io = jiffies;
+ total = transfer(dum_hcd, urb, ep, limit, &status);
+ break;
+ }
+
+ /* incomplete transfer? */
+ if (status == -EINPROGRESS)
+ continue;
+
+return_urb:
+ list_del(&urbp->urbp_list);
+ kfree(urbp);
+ if (ep)
+ ep->already_seen = ep->setup_stage = 0;
+
+ usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb);
+ spin_unlock(&dum->lock);
+ usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status);
+ spin_lock(&dum->lock);
+
+ goto restart;
+ }
+
+ if (list_empty(&dum_hcd->urbp_list)) {
+ usb_put_dev(dum_hcd->udev);
+ dum_hcd->udev = NULL;
+ } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
+ /* want a 1 msec delay here */
+ mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1));
+ }
+
+ spin_unlock_irqrestore(&dum->lock, flags);
+}
+
+/*-------------------------------------------------------------------------*/
+
+#define PORT_C_MASK \
+ ((USB_PORT_STAT_C_CONNECTION \
+ | USB_PORT_STAT_C_ENABLE \
+ | USB_PORT_STAT_C_SUSPEND \
+ | USB_PORT_STAT_C_OVERCURRENT \
+ | USB_PORT_STAT_C_RESET) << 16)
+
+static int dummy_hub_status(struct usb_hcd *hcd, char *buf)
+{
+ struct dummy_hcd *dum_hcd;
+ unsigned long flags;
+ int retval = 0;
+
+ dum_hcd = hcd_to_dummy_hcd(hcd);
+
+ spin_lock_irqsave(&dum_hcd->dum->lock, flags);
+ if (!HCD_HW_ACCESSIBLE(hcd))
+ goto done;
+
+ if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) {
+ dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
+ dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
+ set_link_state(dum_hcd);
+ }
+
+ if ((dum_hcd->port_status & PORT_C_MASK) != 0) {
+ *buf = (1 << 1);
+ dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n",
+ dum_hcd->port_status);
+ retval = 1;
+ if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED)
+ usb_hcd_resume_root_hub(hcd);
+ }
+done:
+ spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
+ return retval;
+}
+
+/* usb 3.0 root hub device descriptor */
+static struct {
+ struct usb_bos_descriptor bos;
+ struct usb_ss_cap_descriptor ss_cap;
+} __packed usb3_bos_desc = {
+
+ .bos = {
+ .bLength = USB_DT_BOS_SIZE,
+ .bDescriptorType = USB_DT_BOS,
+ .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)),
+ .bNumDeviceCaps = 1,
+ },
+ .ss_cap = {
+ .bLength = USB_DT_USB_SS_CAP_SIZE,
+ .bDescriptorType = USB_DT_DEVICE_CAPABILITY,
+ .bDevCapabilityType = USB_SS_CAP_TYPE,
+ .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION),
+ .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION),
+ },
+};
+
+static inline void
+ss_hub_descriptor(struct usb_hub_descriptor *desc)
+{
+ memset(desc, 0, sizeof *desc);
+ desc->bDescriptorType = USB_DT_SS_HUB;
+ desc->bDescLength = 12;
+ desc->wHubCharacteristics = cpu_to_le16(
+ HUB_CHAR_INDV_PORT_LPSM |
+ HUB_CHAR_COMMON_OCPM);
+ desc->bNbrPorts = 1;
+ desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
+ desc->u.ss.DeviceRemovable = 0xffff;
+}
+
+static inline void hub_descriptor(struct usb_hub_descriptor *desc)
+{
+ memset(desc, 0, sizeof *desc);
+ desc->bDescriptorType = USB_DT_HUB;
+ desc->bDescLength = 9;
+ desc->wHubCharacteristics = cpu_to_le16(
+ HUB_CHAR_INDV_PORT_LPSM |
+ HUB_CHAR_COMMON_OCPM);
+ desc->bNbrPorts = 1;
+ desc->u.hs.DeviceRemovable[0] = 0xff;
+ desc->u.hs.DeviceRemovable[1] = 0xff;
+}
+
+static int dummy_hub_control(
+ struct usb_hcd *hcd,
+ u16 typeReq,
+ u16 wValue,
+ u16 wIndex,
+ char *buf,
+ u16 wLength
+) {
+ struct dummy_hcd *dum_hcd;
+ int retval = 0;
+ unsigned long flags;
+
+ if (!HCD_HW_ACCESSIBLE(hcd))
+ return -ETIMEDOUT;
+
+ dum_hcd = hcd_to_dummy_hcd(hcd);
+
+ spin_lock_irqsave(&dum_hcd->dum->lock, flags);
+ switch (typeReq) {
+ case ClearHubFeature:
+ break;
+ case ClearPortFeature:
+ switch (wValue) {
+ case USB_PORT_FEAT_SUSPEND:
+ if (hcd->speed == HCD_USB3) {
+ dev_dbg(dummy_dev(dum_hcd),
+ "USB_PORT_FEAT_SUSPEND req not "
+ "supported for USB 3.0 roothub\n");
+ goto error;
+ }
+ if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) {
+ /* 20msec resume signaling */
+ dum_hcd->resuming = 1;
+ dum_hcd->re_timeout = jiffies +
+ msecs_to_jiffies(20);
+ }
+ break;
+ case USB_PORT_FEAT_POWER:
+ if (hcd->speed == HCD_USB3) {
+ if (dum_hcd->port_status & USB_PORT_STAT_POWER)
+ dev_dbg(dummy_dev(dum_hcd),
+ "power-off\n");
+ } else
+ if (dum_hcd->port_status &
+ USB_SS_PORT_STAT_POWER)
+ dev_dbg(dummy_dev(dum_hcd),
+ "power-off\n");
+ /* FALLS THROUGH */
+ default:
+ dum_hcd->port_status &= ~(1 << wValue);
+ set_link_state(dum_hcd);
+ }
+ break;
+ case GetHubDescriptor:
+ if (hcd->speed == HCD_USB3 &&
+ (wLength < USB_DT_SS_HUB_SIZE ||
+ wValue != (USB_DT_SS_HUB << 8))) {
+ dev_dbg(dummy_dev(dum_hcd),
+ "Wrong hub descriptor type for "
+ "USB 3.0 roothub.\n");
+ goto error;
+ }
+ if (hcd->speed == HCD_USB3)
+ ss_hub_descriptor((struct usb_hub_descriptor *) buf);
+ else
+ hub_descriptor((struct usb_hub_descriptor *) buf);
+ break;
+
+ case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
+ if (hcd->speed != HCD_USB3)
+ goto error;
+
+ if ((wValue >> 8) != USB_DT_BOS)
+ goto error;
+
+ memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
+ retval = sizeof(usb3_bos_desc);
+ break;
+
+ case GetHubStatus:
+ *(__le32 *) buf = cpu_to_le32(0);
+ break;
+ case GetPortStatus:
+ if (wIndex != 1)
+ retval = -EPIPE;
+
+ /* whoever resets or resumes must GetPortStatus to
+ * complete it!!
+ */
+ if (dum_hcd->resuming &&
+ time_after_eq(jiffies, dum_hcd->re_timeout)) {
+ dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
+ dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
+ }
+ if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 &&
+ time_after_eq(jiffies, dum_hcd->re_timeout)) {
+ dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16);
+ dum_hcd->port_status &= ~USB_PORT_STAT_RESET;
+ if (dum_hcd->dum->pullup) {
+ dum_hcd->port_status |= USB_PORT_STAT_ENABLE;
+
+ if (hcd->speed < HCD_USB3) {
+ switch (dum_hcd->dum->gadget.speed) {
+ case USB_SPEED_HIGH:
+ dum_hcd->port_status |=
+ USB_PORT_STAT_HIGH_SPEED;
+ break;
+ case USB_SPEED_LOW:
+ dum_hcd->dum->gadget.ep0->
+ maxpacket = 8;
+ dum_hcd->port_status |=
+ USB_PORT_STAT_LOW_SPEED;
+ break;
+ default:
+ dum_hcd->dum->gadget.speed =
+ USB_SPEED_FULL;
+ break;
+ }
+ }
+ }
+ }
+ set_link_state(dum_hcd);
+ ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status);
+ ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16);
+ break;
+ case SetHubFeature:
+ retval = -EPIPE;
+ break;
+ case SetPortFeature:
+ switch (wValue) {
+ case USB_PORT_FEAT_LINK_STATE:
+ if (hcd->speed != HCD_USB3) {
+ dev_dbg(dummy_dev(dum_hcd),
+ "USB_PORT_FEAT_LINK_STATE req not "
+ "supported for USB 2.0 roothub\n");
+ goto error;
+ }
+ /*
+ * Since this is dummy we don't have an actual link so
+ * there is nothing to do for the SET_LINK_STATE cmd
+ */
+ break;
+ case USB_PORT_FEAT_U1_TIMEOUT:
+ case USB_PORT_FEAT_U2_TIMEOUT:
+ /* TODO: add suspend/resume support! */
+ if (hcd->speed != HCD_USB3) {
+ dev_dbg(dummy_dev(dum_hcd),
+ "USB_PORT_FEAT_U1/2_TIMEOUT req not "
+ "supported for USB 2.0 roothub\n");
+ goto error;
+ }
+ break;
+ case USB_PORT_FEAT_SUSPEND:
+ /* Applicable only for USB2.0 hub */
+ if (hcd->speed == HCD_USB3) {
+ dev_dbg(dummy_dev(dum_hcd),
+ "USB_PORT_FEAT_SUSPEND req not "
+ "supported for USB 3.0 roothub\n");
+ goto error;
+ }
+ if (dum_hcd->active) {
+ dum_hcd->port_status |= USB_PORT_STAT_SUSPEND;
+
+ /* HNP would happen here; for now we
+ * assume b_bus_req is always true.
+ */
+ set_link_state(dum_hcd);
+ if (((1 << USB_DEVICE_B_HNP_ENABLE)
+ & dum_hcd->dum->devstatus) != 0)
+ dev_dbg(dummy_dev(dum_hcd),
+ "no HNP yet!\n");
+ }
+ break;
+ case USB_PORT_FEAT_POWER:
+ if (hcd->speed == HCD_USB3)
+ dum_hcd->port_status |= USB_SS_PORT_STAT_POWER;
+ else
+ dum_hcd->port_status |= USB_PORT_STAT_POWER;
+ set_link_state(dum_hcd);
+ break;
+ case USB_PORT_FEAT_BH_PORT_RESET:
+ /* Applicable only for USB3.0 hub */
+ if (hcd->speed != HCD_USB3) {
+ dev_dbg(dummy_dev(dum_hcd),
+ "USB_PORT_FEAT_BH_PORT_RESET req not "
+ "supported for USB 2.0 roothub\n");
+ goto error;
+ }
+ /* FALLS THROUGH */
+ case USB_PORT_FEAT_RESET:
+ /* if it's already enabled, disable */
+ if (hcd->speed == HCD_USB3) {
+ dum_hcd->port_status = 0;
+ dum_hcd->port_status =
+ (USB_SS_PORT_STAT_POWER |
+ USB_PORT_STAT_CONNECTION |
+ USB_PORT_STAT_RESET);
+ } else
+ dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE
+ | USB_PORT_STAT_LOW_SPEED
+ | USB_PORT_STAT_HIGH_SPEED);
+ /*
+ * We want to reset device status. All but the
+ * Self powered feature
+ */
+ dum_hcd->dum->devstatus &=
+ (1 << USB_DEVICE_SELF_POWERED);
+ /*
+ * FIXME USB3.0: what is the correct reset signaling
+ * interval? Is it still 50msec as for HS?
+ */
+ dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
+ /* FALLS THROUGH */
+ default:
+ if (hcd->speed == HCD_USB3) {
+ if ((dum_hcd->port_status &
+ USB_SS_PORT_STAT_POWER) != 0) {
+ dum_hcd->port_status |= (1 << wValue);
+ set_link_state(dum_hcd);
+ }
+ } else
+ if ((dum_hcd->port_status &
+ USB_PORT_STAT_POWER) != 0) {
+ dum_hcd->port_status |= (1 << wValue);
+ set_link_state(dum_hcd);
+ }
+ }
+ break;
+ case GetPortErrorCount:
+ if (hcd->speed != HCD_USB3) {
+ dev_dbg(dummy_dev(dum_hcd),
+ "GetPortErrorCount req not "
+ "supported for USB 2.0 roothub\n");
+ goto error;
+ }
+ /* We'll always return 0 since this is a dummy hub */
+ *(__le32 *) buf = cpu_to_le32(0);
+ break;
+ case SetHubDepth:
+ if (hcd->speed != HCD_USB3) {
+ dev_dbg(dummy_dev(dum_hcd),
+ "SetHubDepth req not supported for "
+ "USB 2.0 roothub\n");
+ goto error;
+ }
+ break;
+ default:
+ dev_dbg(dummy_dev(dum_hcd),
+ "hub control req%04x v%04x i%04x l%d\n",
+ typeReq, wValue, wIndex, wLength);
+error:
+ /* "protocol stall" on error */
+ retval = -EPIPE;
+ }
+ spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
+
+ if ((dum_hcd->port_status & PORT_C_MASK) != 0)
+ usb_hcd_poll_rh_status(hcd);
+ return retval;
+}
+
+static int dummy_bus_suspend(struct usb_hcd *hcd)
+{
+ struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
+
+ dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
+
+ spin_lock_irq(&dum_hcd->dum->lock);
+ dum_hcd->rh_state = DUMMY_RH_SUSPENDED;
+ set_link_state(dum_hcd);
+ hcd->state = HC_STATE_SUSPENDED;
+ spin_unlock_irq(&dum_hcd->dum->lock);
+ return 0;
+}
+
+static int dummy_bus_resume(struct usb_hcd *hcd)
+{
+ struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
+ int rc = 0;
+
+ dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
+
+ spin_lock_irq(&dum_hcd->dum->lock);
+ if (!HCD_HW_ACCESSIBLE(hcd)) {
+ rc = -ESHUTDOWN;
+ } else {
+ dum_hcd->rh_state = DUMMY_RH_RUNNING;
+ set_link_state(dum_hcd);
+ if (!list_empty(&dum_hcd->urbp_list))
+ mod_timer(&dum_hcd->timer, jiffies);
+ hcd->state = HC_STATE_RUNNING;
+ }
+ spin_unlock_irq(&dum_hcd->dum->lock);
+ return rc;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb)
+{
+ int ep = usb_pipeendpoint(urb->pipe);
+
+ return snprintf(buf, size,
+ "urb/%p %s ep%d%s%s len %d/%d\n",
+ urb,
+ ({ char *s;
+ switch (urb->dev->speed) {
+ case USB_SPEED_LOW:
+ s = "ls";
+ break;
+ case USB_SPEED_FULL:
+ s = "fs";
+ break;
+ case USB_SPEED_HIGH:
+ s = "hs";
+ break;
+ case USB_SPEED_SUPER:
+ s = "ss";
+ break;
+ default:
+ s = "?";
+ break;
+ } s; }),
+ ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "",
+ ({ char *s; \
+ switch (usb_pipetype(urb->pipe)) { \
+ case PIPE_CONTROL: \
+ s = ""; \
+ break; \
+ case PIPE_BULK: \
+ s = "-bulk"; \
+ break; \
+ case PIPE_INTERRUPT: \
+ s = "-int"; \
+ break; \
+ default: \
+ s = "-iso"; \
+ break; \
+ } s; }),
+ urb->actual_length, urb->transfer_buffer_length);
+}
+
+static ssize_t urbs_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct usb_hcd *hcd = dev_get_drvdata(dev);
+ struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
+ struct urbp *urbp;
+ size_t size = 0;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dum_hcd->dum->lock, flags);
+ list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) {
+ size_t temp;
+
+ temp = show_urb(buf, PAGE_SIZE - size, urbp->urb);
+ buf += temp;
+ size += temp;
+ }
+ spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
+
+ return size;
+}
+static DEVICE_ATTR_RO(urbs);
+
+static int dummy_start_ss(struct dummy_hcd *dum_hcd)
+{
+ init_timer(&dum_hcd->timer);
+ dum_hcd->timer.function = dummy_timer;
+ dum_hcd->timer.data = (unsigned long)dum_hcd;
+ dum_hcd->rh_state = DUMMY_RH_RUNNING;
+ dum_hcd->stream_en_ep = 0;
+ INIT_LIST_HEAD(&dum_hcd->urbp_list);
+ dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET;
+ dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
+ dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
+#ifdef CONFIG_USB_OTG
+ dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1;
+#endif
+ return 0;
+
+ /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
+ return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
+}
+
+static int dummy_start(struct usb_hcd *hcd)
+{
+ struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
+
+ /*
+ * MASTER side init ... we emulate a root hub that'll only ever
+ * talk to one device (the slave side). Also appears in sysfs,
+ * just like more familiar pci-based HCDs.
+ */
+ if (!usb_hcd_is_primary_hcd(hcd))
+ return dummy_start_ss(dum_hcd);
+
+ spin_lock_init(&dum_hcd->dum->lock);
+ init_timer(&dum_hcd->timer);
+ dum_hcd->timer.function = dummy_timer;
+ dum_hcd->timer.data = (unsigned long)dum_hcd;
+ dum_hcd->rh_state = DUMMY_RH_RUNNING;
+
+ INIT_LIST_HEAD(&dum_hcd->urbp_list);
+
+ hcd->power_budget = POWER_BUDGET;
+ hcd->state = HC_STATE_RUNNING;
+ hcd->uses_new_polling = 1;
+
+#ifdef CONFIG_USB_OTG
+ hcd->self.otg_port = 1;
+#endif
+
+ /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
+ return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
+}
+
+static void dummy_stop(struct usb_hcd *hcd)
+{
+ struct dummy *dum;
+
+ dum = hcd_to_dummy_hcd(hcd)->dum;
+ device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
+ dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int dummy_h_get_frame(struct usb_hcd *hcd)
+{
+ return dummy_g_get_frame(NULL);
+}
+
+static int dummy_setup(struct usb_hcd *hcd)
+{
+ struct dummy *dum;
+
+ dum = *((void **)dev_get_platdata(hcd->self.controller));
+ hcd->self.sg_tablesize = ~0;
+ if (usb_hcd_is_primary_hcd(hcd)) {
+ dum->hs_hcd = hcd_to_dummy_hcd(hcd);
+ dum->hs_hcd->dum = dum;
+ /*
+ * Mark the first roothub as being USB 2.0.
+ * The USB 3.0 roothub will be registered later by
+ * dummy_hcd_probe()
+ */
+ hcd->speed = HCD_USB2;
+ hcd->self.root_hub->speed = USB_SPEED_HIGH;
+ } else {
+ dum->ss_hcd = hcd_to_dummy_hcd(hcd);
+ dum->ss_hcd->dum = dum;
+ hcd->speed = HCD_USB3;
+ hcd->self.root_hub->speed = USB_SPEED_SUPER;
+ }
+ return 0;
+}
+
+/* Change a group of bulk endpoints to support multiple stream IDs */
+static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
+ struct usb_host_endpoint **eps, unsigned int num_eps,
+ unsigned int num_streams, gfp_t mem_flags)
+{
+ struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
+ unsigned long flags;
+ int max_stream;
+ int ret_streams = num_streams;
+ unsigned int index;
+ unsigned int i;
+
+ if (!num_eps)
+ return -EINVAL;
+
+ spin_lock_irqsave(&dum_hcd->dum->lock, flags);
+ for (i = 0; i < num_eps; i++) {
+ index = dummy_get_ep_idx(&eps[i]->desc);
+ if ((1 << index) & dum_hcd->stream_en_ep) {
+ ret_streams = -EINVAL;
+ goto out;
+ }
+ max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp);
+ if (!max_stream) {
+ ret_streams = -EINVAL;
+ goto out;
+ }
+ if (max_stream < ret_streams) {
+ dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u "
+ "stream IDs.\n",
+ eps[i]->desc.bEndpointAddress,
+ max_stream);
+ ret_streams = max_stream;
+ }
+ }
+
+ for (i = 0; i < num_eps; i++) {
+ index = dummy_get_ep_idx(&eps[i]->desc);
+ dum_hcd->stream_en_ep |= 1 << index;
+ set_max_streams_for_pipe(dum_hcd,
+ usb_endpoint_num(&eps[i]->desc), ret_streams);
+ }
+out:
+ spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
+ return ret_streams;
+}
+
+/* Reverts a group of bulk endpoints back to not using stream IDs. */
+static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
+ struct usb_host_endpoint **eps, unsigned int num_eps,
+ gfp_t mem_flags)
+{
+ struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
+ unsigned long flags;
+ int ret;
+ unsigned int index;
+ unsigned int i;
+
+ spin_lock_irqsave(&dum_hcd->dum->lock, flags);
+ for (i = 0; i < num_eps; i++) {
+ index = dummy_get_ep_idx(&eps[i]->desc);
+ if (!((1 << index) & dum_hcd->stream_en_ep)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+
+ for (i = 0; i < num_eps; i++) {
+ index = dummy_get_ep_idx(&eps[i]->desc);
+ dum_hcd->stream_en_ep &= ~(1 << index);
+ set_max_streams_for_pipe(dum_hcd,
+ usb_endpoint_num(&eps[i]->desc), 0);
+ }
+ ret = 0;
+out:
+ spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
+ return ret;
+}
+
+static struct hc_driver dummy_hcd = {
+ .description = (char *) driver_name,
+ .product_desc = "Dummy host controller",
+ .hcd_priv_size = sizeof(struct dummy_hcd),
+
+ .flags = HCD_USB3 | HCD_SHARED,
+
+ .reset = dummy_setup,
+ .start = dummy_start,
+ .stop = dummy_stop,
+
+ .urb_enqueue = dummy_urb_enqueue,
+ .urb_dequeue = dummy_urb_dequeue,
+
+ .get_frame_number = dummy_h_get_frame,
+
+ .hub_status_data = dummy_hub_status,
+ .hub_control = dummy_hub_control,
+ .bus_suspend = dummy_bus_suspend,
+ .bus_resume = dummy_bus_resume,
+
+ .alloc_streams = dummy_alloc_streams,
+ .free_streams = dummy_free_streams,
+};
+
+static int dummy_hcd_probe(struct platform_device *pdev)
+{
+ struct dummy *dum;
+ struct usb_hcd *hs_hcd;
+ struct usb_hcd *ss_hcd;
+ int retval;
+
+ dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
+ dum = *((void **)dev_get_platdata(&pdev->dev));
+
+ if (!mod_data.is_super_speed)
+ dummy_hcd.flags = HCD_USB2;
+ hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
+ if (!hs_hcd)
+ return -ENOMEM;
+ hs_hcd->has_tt = 1;
+
+ retval = usb_add_hcd(hs_hcd, 0, 0);
+ if (retval)
+ goto put_usb2_hcd;
+
+ if (mod_data.is_super_speed) {
+ ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev,
+ dev_name(&pdev->dev), hs_hcd);
+ if (!ss_hcd) {
+ retval = -ENOMEM;
+ goto dealloc_usb2_hcd;
+ }
+
+ retval = usb_add_hcd(ss_hcd, 0, 0);
+ if (retval)
+ goto put_usb3_hcd;
+ }
+ return 0;
+
+put_usb3_hcd:
+ usb_put_hcd(ss_hcd);
+dealloc_usb2_hcd:
+ usb_remove_hcd(hs_hcd);
+put_usb2_hcd:
+ usb_put_hcd(hs_hcd);
+ dum->hs_hcd = dum->ss_hcd = NULL;
+ return retval;
+}
+
+static int dummy_hcd_remove(struct platform_device *pdev)
+{
+ struct dummy *dum;
+
+ dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum;
+
+ if (dum->ss_hcd) {
+ usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
+ usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
+ }
+
+ usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
+ usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
+
+ dum->hs_hcd = NULL;
+ dum->ss_hcd = NULL;
+
+ return 0;
+}
+
+static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct usb_hcd *hcd;
+ struct dummy_hcd *dum_hcd;
+ int rc = 0;
+
+ dev_dbg(&pdev->dev, "%s\n", __func__);
+
+ hcd = platform_get_drvdata(pdev);
+ dum_hcd = hcd_to_dummy_hcd(hcd);
+ if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
+ dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
+ rc = -EBUSY;
+ } else
+ clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+ return rc;
+}
+
+static int dummy_hcd_resume(struct platform_device *pdev)
+{
+ struct usb_hcd *hcd;
+
+ dev_dbg(&pdev->dev, "%s\n", __func__);
+
+ hcd = platform_get_drvdata(pdev);
+ set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+ usb_hcd_poll_rh_status(hcd);
+ return 0;
+}
+
+static struct platform_driver dummy_hcd_driver = {
+ .probe = dummy_hcd_probe,
+ .remove = dummy_hcd_remove,
+ .suspend = dummy_hcd_suspend,
+ .resume = dummy_hcd_resume,
+ .driver = {
+ .name = (char *) driver_name,
+ },
+};
+
+/*-------------------------------------------------------------------------*/
+#define MAX_NUM_UDC 2
+static struct platform_device *the_udc_pdev[MAX_NUM_UDC];
+static struct platform_device *the_hcd_pdev[MAX_NUM_UDC];
+
+static int __init init(void)
+{
+ int retval = -ENOMEM;
+ int i;
+ struct dummy *dum[MAX_NUM_UDC];
+
+ if (usb_disabled())
+ return -ENODEV;
+
+ if (!mod_data.is_high_speed && mod_data.is_super_speed)
+ return -EINVAL;
+
+ if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) {
+ pr_err("Number of emulated UDC must be in range of 1...%d\n",
+ MAX_NUM_UDC);
+ return -EINVAL;
+ }
+
+ for (i = 0; i < mod_data.num; i++) {
+ the_hcd_pdev[i] = platform_device_alloc(driver_name, i);
+ if (!the_hcd_pdev[i]) {
+ i--;
+ while (i >= 0)
+ platform_device_put(the_hcd_pdev[i--]);
+ return retval;
+ }
+ }
+ for (i = 0; i < mod_data.num; i++) {
+ the_udc_pdev[i] = platform_device_alloc(gadget_name, i);
+ if (!the_udc_pdev[i]) {
+ i--;
+ while (i >= 0)
+ platform_device_put(the_udc_pdev[i--]);
+ goto err_alloc_udc;
+ }
+ }
+ for (i = 0; i < mod_data.num; i++) {
+ dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL);
+ if (!dum[i]) {
+ retval = -ENOMEM;
+ goto err_add_pdata;
+ }
+ retval = platform_device_add_data(the_hcd_pdev[i], &dum[i],
+ sizeof(void *));
+ if (retval)
+ goto err_add_pdata;
+ retval = platform_device_add_data(the_udc_pdev[i], &dum[i],
+ sizeof(void *));
+ if (retval)
+ goto err_add_pdata;
+ }
+
+ retval = platform_driver_register(&dummy_hcd_driver);
+ if (retval < 0)
+ goto err_add_pdata;
+ retval = platform_driver_register(&dummy_udc_driver);
+ if (retval < 0)
+ goto err_register_udc_driver;
+
+ for (i = 0; i < mod_data.num; i++) {
+ retval = platform_device_add(the_hcd_pdev[i]);
+ if (retval < 0) {
+ i--;
+ while (i >= 0)
+ platform_device_del(the_hcd_pdev[i--]);
+ goto err_add_hcd;
+ }
+ }
+ for (i = 0; i < mod_data.num; i++) {
+ if (!dum[i]->hs_hcd ||
+ (!dum[i]->ss_hcd && mod_data.is_super_speed)) {
+ /*
+ * The hcd was added successfully but its probe
+ * function failed for some reason.
+ */
+ retval = -EINVAL;
+ goto err_add_udc;
+ }
+ }
+
+ for (i = 0; i < mod_data.num; i++) {
+ retval = platform_device_add(the_udc_pdev[i]);
+ if (retval < 0) {
+ i--;
+ while (i >= 0)
+ platform_device_del(the_udc_pdev[i]);
+ goto err_add_udc;
+ }
+ }
+
+ for (i = 0; i < mod_data.num; i++) {
+ if (!platform_get_drvdata(the_udc_pdev[i])) {
+ /*
+ * The udc was added successfully but its probe
+ * function failed for some reason.
+ */
+ retval = -EINVAL;
+ goto err_probe_udc;
+ }
+ }
+ return retval;
+
+err_probe_udc:
+ for (i = 0; i < mod_data.num; i++)
+ platform_device_del(the_udc_pdev[i]);
+err_add_udc:
+ for (i = 0; i < mod_data.num; i++)
+ platform_device_del(the_hcd_pdev[i]);
+err_add_hcd:
+ platform_driver_unregister(&dummy_udc_driver);
+err_register_udc_driver:
+ platform_driver_unregister(&dummy_hcd_driver);
+err_add_pdata:
+ for (i = 0; i < mod_data.num; i++)
+ kfree(dum[i]);
+ for (i = 0; i < mod_data.num; i++)
+ platform_device_put(the_udc_pdev[i]);
+err_alloc_udc:
+ for (i = 0; i < mod_data.num; i++)
+ platform_device_put(the_hcd_pdev[i]);
+ return retval;
+}
+module_init(init);
+
+static void __exit cleanup(void)
+{
+ int i;
+
+ for (i = 0; i < mod_data.num; i++) {
+ struct dummy *dum;
+
+ dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev));
+
+ platform_device_unregister(the_udc_pdev[i]);
+ platform_device_unregister(the_hcd_pdev[i]);
+ kfree(dum);
+ }
+ platform_driver_unregister(&dummy_udc_driver);
+ platform_driver_unregister(&dummy_hcd_driver);
+}
+module_exit(cleanup);
Code Review / kvmfornfv.git / blobdiff