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dummy_hcd.c
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/*
* dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver.
*
* Maintainer: Alan Stern <[email protected]>
*
* 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 struct {
const char *name;
const struct usb_ep_caps caps;
} ep_info[] = {
#define EP_INFO(_name, _caps) \
{ \
.name = _name, \
.caps = _caps, \
}
/* everyone has ep0 */
EP_INFO(ep0name,
USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
/* act like a pxa250: fifteen fixed function endpoints */
EP_INFO("ep1in-bulk",
USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep2out-bulk",
USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep3in-iso",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep4out-iso",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep5in-int",
USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep6in-bulk",
USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep7out-bulk",
USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep8in-iso",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep9out-iso",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep10in-int",
USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep11in-bulk",
USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep12out-bulk",
USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep13in-iso",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep14out-iso",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep15in-int",
USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
/* or like sa1100: two fixed function endpoints */
EP_INFO("ep1out-bulk",
USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep2in-bulk",
USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
/* and now some generic EPs so we have enough in multi config */
EP_INFO("ep3out",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep4in",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep5out",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep6out",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep7in",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep8out",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep9in",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep10out",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep11out",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep12in",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep13out",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep14in",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep15out",
USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
#undef EP_INFO
};
#define DUMMY_ENDPOINTS ARRAY_SIZE(ep_info)
/*-------------------------------------------------------------------------*/
#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 timespec64 ts64;
ktime_get_ts64(&ts64);
return ts64.tv_nsec / NSEC_PER_MSEC;
}
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;