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linux-zen-desktop/drivers/usb/gadget/udc/dummy_hcd.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* 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 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 (device);
* - 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.
*
* Note: The emulation does not include isochronous transfers!
*/
#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 */
#define POWER_BUDGET_3 900 /* in mA */
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, \
}
/* we don't provide isochronous endpoints since we don't support them */
#define TYPE_BULK_OR_INT (USB_EP_CAPS_TYPE_BULK | USB_EP_CAPS_TYPE_INT)
/* 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("ep-aout",
USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep-bin",
USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep-cout",
USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep-dout",
USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep-ein",
USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep-fout",
USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep-gin",
USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep-hout",
USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep-iout",
USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep-jin",
USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep-kout",
USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
EP_INFO("ep-lin",
USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
EP_INFO("ep-mout",
USB_EP_CAPS(TYPE_BULK_OR_INT, 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;
struct urbp *next_frame_urbp;
u32 stream_en_ep;
u8 num_stream[30 / 2];
unsigned active:1;
unsigned old_active:1;
unsigned resuming:1;
};
struct dummy {
spinlock_t lock;
/*
* DEVICE/GADGET side support
*/
struct dummy_ep ep[DUMMY_ENDPOINTS];
int address;
int callback_usage;
struct usb_gadget gadget;
struct usb_gadget_driver *driver;
struct dummy_request fifo_req;
u8 fifo_buf[FIFO_SIZE];
u16 devstatus;
unsigned ints_enabled:1;
unsigned udc_suspended:1;
unsigned pullup:1;
/*
* 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);
}
/*-------------------------------------------------------------------------*/
/* DEVICE/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)
{
int i;
/* 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 */
for (i = 0; i < DUMMY_ENDPOINTS; ++i)
nuke(dum, &dum->ep[i]);
/* 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) &&
(dum_hcd->port_status &
USB_PORT_STAT_LINK_STATE) == USB_SS_PORT_LS_U0 &&
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)
__must_hold(&dum->lock)
{
struct dummy *dum = dum_hcd->dum;
unsigned int power_bit;
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);
power_bit = (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 ?
USB_SS_PORT_STAT_POWER : USB_PORT_STAT_POWER);
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 & power_bit) == 0 ||
(dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) {
unsigned int disconnect = power_bit &
dum_hcd->old_status & (~dum_hcd->port_status);
unsigned int reset = USB_PORT_STAT_RESET &
(~dum_hcd->old_status) & dum_hcd->port_status;
/* Report reset and disconnect events to the driver */
if (dum->ints_enabled && (disconnect || reset)) {
stop_activity(dum);
++dum->callback_usage;
spin_unlock(&dum->lock);
if (reset)
usb_gadget_udc_reset(&dum->gadget, dum->driver);
else
dum->driver->disconnect(&dum->gadget);
spin_lock(&dum->lock);
--dum->callback_usage;
}
} else if (dum_hcd->active != dum_hcd->old_active &&
dum->ints_enabled) {
++dum->callback_usage;
spin_unlock(&dum->lock);
if (dum_hcd->old_active && dum->driver->suspend)
dum->driver->suspend(&dum->gadget);
else if (!dum_hcd->old_active && dum->driver->resume)
dum->driver->resume(&dum->gadget);
spin_lock(&dum->lock);
--dum->callback_usage;
}
dum_hcd->old_status = dum_hcd->port_status;
dum_hcd->old_active = dum_hcd->active;
}
/*-------------------------------------------------------------------------*/
/* DEVICE/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);
/* 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 */
fallthrough;
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 */
fallthrough;
case USB_SPEED_FULL:
if (max <= 64)
break;
/* save a return statement */
fallthrough;
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 */
fallthrough;
case USB_SPEED_FULL:
if (max <= 1023)
break;
/* save a return statement */
fallthrough;
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",
usb_ep_type_string(usb_endpoint_type(desc)),
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_request *req;
if (!_ep)
return NULL;
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, *iter;
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(iter, &ep->queue, queue) {
if (&iter->req != _req)
continue;
list_del_init(&iter->queue);
_req->status = -ECONNRESET;
req = iter;
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);
dum_hcd = gadget_to_dummy_hcd(_gadget);
spin_lock_irqsave(&dum->lock, flags);
dum->pullup = (value != 0);
set_link_state(dum_hcd);
if (value == 0) {
/*
* Emulate synchronize_irq(): wait for callbacks to finish.
* This seems to be the best place to emulate the call to
* synchronize_irq() that's in usb_gadget_remove_driver().
* Doing it in dummy_udc_stop() would be too late since it
* is called after the unbind callback and unbind shouldn't
* be invoked until all the other callbacks are finished.
*/
while (dum->callback_usage > 0) {
spin_unlock_irqrestore(&dum->lock, flags);
usleep_range(1000, 2000);
spin_lock_irqsave(&dum->lock, flags);
}
}
spin_unlock_irqrestore(&dum->lock, flags);
usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
return 0;
}
static void dummy_udc_set_speed(struct usb_gadget *_gadget,
enum usb_device_speed speed)
{
struct dummy *dum;
dum = gadget_dev_to_dummy(&_gadget->dev);
dum->gadget.speed = speed;
dummy_udc_update_ep0(dum);
}
static void dummy_udc_async_callbacks(struct usb_gadget *_gadget, bool enable)
{
struct dummy *dum = gadget_dev_to_dummy(&_gadget->dev);
spin_lock_irq(&dum->lock);
dum->ints_enabled = enable;
spin_unlock_irq(&dum->lock);
}
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,
.udc_set_speed = dummy_udc_set_speed,
.udc_async_callbacks = dummy_udc_async_callbacks,
};
/*-------------------------------------------------------------------------*/
/* "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 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;
switch (g->speed) {
/* All the speeds we support */
case USB_SPEED_LOW:
case USB_SPEED_FULL:
case USB_SPEED_HIGH:
case USB_SPEED_SUPER:
break;
default:
dev_err(dummy_dev(dum_hcd), "Unsupported driver max speed %d\n",
driver->max_speed);
return -EINVAL;
}
/*
* DEVICE side init ... the layer above hardware, which
* can't enumerate without help from the driver we're binding.
*/
spin_lock_irq(&dum->lock);
dum->devstatus = 0;
dum->driver = driver;
spin_unlock_irq(&dum->lock);
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;
spin_lock_irq(&dum->lock);
dum->ints_enabled = 0;
stop_activity(dum);
dum->driver = NULL;
spin_unlock_irq(&dum->lock);
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_info[i].name)
break;
ep->ep.name = ep_info[i].name;
ep->ep.caps = ep_info[i].caps;
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));
/* Clear usb_gadget region for new registration to udc-core */
memzero_explicit(&dum->gadget, sizeof(struct usb_gadget));
dum->gadget.name = gadget_name;
dum->gadget.ops = &dummy_ops;
if (mod_data.is_super_speed)
dum->gadget.max_speed = USB_SPEED_SUPER;
else if (mod_data.is_high_speed)
dum->gadget.max_speed = USB_SPEED_HIGH;
else
dum->gadget.max_speed = USB_SPEED_FULL;
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 = 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;
}
/* 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 (!dum_hcd->next_frame_urbp)
dum_hcd->next_frame_urbp = 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_urb_dir_in(urb);
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;
int sent = 0;
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_urb_dir_in(urb);
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;
/* send multiple of maxpacket first, then remainder */
if (len >= ep->ep.maxpacket) {
is_short = 0;
if (len % ep->ep.maxpacket)
rescan = 1;
len -= len % ep->ep.maxpacket;
} else {
is_short = 1;
}
len = dummy_perform_transfer(urb, req, len);
ep->last_io = jiffies;
if ((int)len < 0) {
req->req.status = len;
} else {
limit -= len;
sent += 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 {
*status = 0;
if (host_len > dev_len)
req->req.status = -EOVERFLOW;
else
req->req.status = 0;
}
/*
* many requests terminate without a short packet.
* send a zlp if demanded by flags.
*/
} else {
if (req->req.length == req->req.actual) {
if (req->req.zero && to_host)
rescan = 1;
else
req->req.status = 0;
}
if (urb->transfer_buffer_length == urb->actual_length) {
if (urb->transfer_flags & URB_ZERO_PACKET &&
!to_host)
rescan = 1;
else
*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 sent;
}
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_mult(ep->desc);
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 (!dum->ints_enabled)
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_hcd: 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 that the callbacks are invoked from soft interrupt
* context.
*/
static void dummy_timer(struct timer_list *t)
{
struct dummy_hcd *dum_hcd = from_timer(dum_hcd, t, timer);
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 */
/* FIXME: account for transaction and packet overhead */
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: /* Can't happen */
dev_err(dummy_dev(dum_hcd), "bogus device speed\n");
total = 0;
break;
}
/* 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;
}
dum_hcd->next_frame_urbp = NULL;
for (i = 0; i < DUMMY_ENDPOINTS; i++) {
if (!ep_info[i].name)
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 status = -EINPROGRESS;
/* stop when we reach URBs queued after the timer interrupt */
if (urbp == dum_hcd->next_frame_urbp)
break;
urb = urbp->urb;
if (urb->unlinked)
goto return_urb;
else if (dum_hcd->rh_state != DUMMY_RH_RUNNING)
continue;
/* Used up this frame's bandwidth? */
if (total <= 0)
continue;
/* find the gadget's ep for this request (if configured) */
address = usb_pipeendpoint (urb->pipe);
if (usb_urb_dir_in(urb))
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;
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) {
++dum->callback_usage;
spin_unlock(&dum->lock);
value = dum->driver->setup(&dum->gadget,
&setup);
spin_lock(&dum->lock);
--dum->callback_usage;
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:
/*
* We don't support isochronous. But if we did,
* here are some of the issues we'd have to face:
*
* 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 = -EINVAL; /* fail all xfers */
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 = 0;
}
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] = 0;
desc->u.hs.DeviceRemovable[1] = 0xff; /* PortPwrCtrlMask */
}
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:
dev_dbg(dummy_dev(dum_hcd), "power-off\n");
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_ENABLE:
case USB_PORT_FEAT_C_ENABLE:
case USB_PORT_FEAT_C_SUSPEND:
/* Not allowed for USB-3 */
if (hcd->speed == HCD_USB3)
goto error;
fallthrough;
case USB_PORT_FEAT_C_CONNECTION:
case USB_PORT_FEAT_C_RESET:
dum_hcd->port_status &= ~(1 << wValue);
set_link_state(dum_hcd);
break;
default:
/* Disallow INDICATOR and C_OVER_CURRENT */
goto error;
}
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:
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;
}
fallthrough;
case USB_PORT_FEAT_RESET:
if (!(dum_hcd->port_status & USB_PORT_STAT_CONNECTION))
break;
/* if it's already enabled, disable */
if (hcd->speed == HCD_USB3) {
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);
dum_hcd->port_status |= USB_PORT_STAT_RESET;
}
/*
* 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);
set_link_state(dum_hcd);
break;
case USB_PORT_FEAT_C_CONNECTION:
case USB_PORT_FEAT_C_RESET:
case USB_PORT_FEAT_C_ENABLE:
case USB_PORT_FEAT_C_SUSPEND:
/* Not allowed for USB-3, and ignored for USB-2 */
if (hcd->speed == HCD_USB3)
goto error;
break;
default:
/* Disallow TEST, INDICATOR, and C_OVER_CURRENT */
goto error;
}
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 scnprintf(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_urb_dir_in(urb) ? "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)
{
timer_setup(&dum_hcd->timer, dummy_timer, 0);
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_3;
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);
/*
* HOST side init ... we emulate a root hub that'll only ever
* talk to one device (the gadget 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);
timer_setup(&dum_hcd->timer, dummy_timer, 0);
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)
{
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),
.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_USB3 | HCD_SHARED;
else if (mod_data.is_high_speed)
dummy_hcd.flags = HCD_USB2;
else
dummy_hcd.flags = HCD_USB11;
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 = driver_name,
},
};
/*-------------------------------------------------------------------------*/
#define MAX_NUM_UDC 32
static struct platform_device *the_udc_pdev[MAX_NUM_UDC];
static struct platform_device *the_hcd_pdev[MAX_NUM_UDC];
static int __init dummy_hcd_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(dummy_hcd_init);
static void __exit dummy_hcd_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(dummy_hcd_cleanup);
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