/* * dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver. * * Maintainer: Alan Stern * * 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 program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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; }; static struct dummy_hcd_module_parameters mod_data = { .is_super_speed = false, .is_high_speed = true, }; 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"); /*-------------------------------------------------------------------------*/ /* 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; }; struct dummy_request { struct list_head queue; /* ep's requests */ struct usb_request req; }; static inline struct dummy_ep *usb_ep_to_dummy_ep (struct usb_ep *_ep) { return container_of (_ep, struct dummy_ep, ep); } static inline struct dummy_request *usb_request_to_dummy_request (struct usb_request *_req) { return container_of (_req, struct dummy_request, req); } /*-------------------------------------------------------------------------*/ /* * Every device has ep0 for control requests, plus up to 30 more endpoints, * in one of two types: * * - Configurable: direction (in/out), type (bulk, iso, etc), and endpoint * number can be changed. Names like "ep-a" are used for this type. * * - Fixed Function: in other cases. some characteristics may be mutable; * that'd be hardware-specific. Names like "ep12out-bulk" are used. * * Gadget drivers are responsible for not setting up conflicting endpoint * configurations, illegal or unsupported packet lengths, and so on. */ static const char ep0name [] = "ep0"; static const char *const ep_name [] = { ep0name, /* everyone has ep0 */ /* act like a net2280: high speed, six configurable endpoints */ "ep-a", "ep-b", "ep-c", "ep-d", "ep-e", "ep-f", /* or like pxa250: fifteen fixed function endpoints */ "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int", "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int", "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso", "ep15in-int", /* or like sa1100: two fixed function endpoints */ "ep1out-bulk", "ep2in-bulk", }; #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_name) /*-------------------------------------------------------------------------*/ #define FIFO_SIZE 64 struct urbp { struct urb *urb; struct list_head urbp_list; }; 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; 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); } static struct dummy the_controller; /*-------------------------------------------------------------------------*/ /* 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); req->req.complete (&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; /* if !connected or reset */ if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0 || (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) { /* * We're connected and not reset (reset occurred now), * and driver attached - disconnect! */ if ((dum_hcd->old_status & USB_PORT_STAT_CONNECTION) != 0 && (dum_hcd->old_status & USB_PORT_STAT_RESET) == 0 && dum->driver) { stop_activity(dum); spin_unlock(&dum->lock); 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; if (dum->gadget.speed == USB_SPEED_SUPER) dum_hcd = dum->ss_hcd; else dum_hcd = dum->hs_hcd; 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 = le16_to_cpu(desc->wMaxPacketSize) & 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 (desc->bmAttributes & 0x03) { 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; ep->desc = desc; dev_dbg (udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n", _ep->name, desc->bEndpointAddress & 0x0f, (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out", ({ char *val; switch (desc->bmAttributes & 0x03) { 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); /* 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; int retval; 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; retval = 0; nuke (dum, ep); spin_unlock_irqrestore (&dum->lock, flags); dev_dbg (udc_dev(dum), "disabled %s\n", _ep->name); return retval; } 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_ep *ep; struct dummy_request *req; ep = usb_ep_to_dummy_ep (_ep); if (!ep || !_req || (!ep->desc && _ep->name != ep0name)) 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); if (dum->gadget.speed == USB_SPEED_SUPER) dum_hcd = dum->ss_hcd; else dum_hcd = dum->hs_hcd; 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; _req->complete (_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); _req->complete (_ep, _req); } local_irq_restore (flags); return retval; } static int dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged) { struct dummy_ep *ep; struct dummy *dum; if (!_ep) return -EINVAL; ep = usb_ep_to_dummy_ep (_ep); dum = ep_to_dummy (ep); if (!dum->driver) return -ESHUTDOWN; if (!value) ep->halted = ep->wedged = 0; else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) && !list_empty (&ep->queue)) return -EAGAIN; else { ep->halted = 1; if (wedged) ep->wedged = 1; } /* FIXME clear emulated data toggle too */ return 0; } static int dummy_set_halt(struct usb_ep *_ep, int value) { return dummy_set_halt_and_wedge(_ep, value, 0); } static int dummy_set_wedge(struct usb_ep *_ep) { if (!_ep || _ep->name == ep0name) return -EINVAL; return dummy_set_halt_and_wedge(_ep, 1, 1); } static const struct usb_ep_ops dummy_ep_ops = { .enable = dummy_enable, .disable = dummy_disable, .alloc_request = dummy_alloc_request, .free_request = dummy_free_request, .queue = dummy_queue, .dequeue = dummy_dequeue, .set_halt = dummy_set_halt, .set_wedge = dummy_set_wedge, }; /*-------------------------------------------------------------------------*/ /* there are both host and device side versions of this call ... */ static int dummy_g_get_frame (struct usb_gadget *_gadget) { struct timeval tv; do_gettimeofday (&tv); return tv.tv_usec / 1000; } static int dummy_wakeup (struct usb_gadget *_gadget) { struct dummy_hcd *dum_hcd; dum_hcd = gadget_to_dummy_hcd(_gadget); if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE) | (1 << USB_DEVICE_REMOTE_WAKEUP)))) return -EINVAL; if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0) return -ENOLINK; if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 && dum_hcd->rh_state != DUMMY_RH_SUSPENDED) return -EIO; /* FIXME: What if the root hub is suspended but the port isn't? */ /* hub notices our request, issues downstream resume, etc */ dum_hcd->resuming = 1; dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20); mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout); return 0; } static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value) { struct dummy *dum; 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 int dummy_pullup (struct usb_gadget *_gadget, int value) { struct dummy *dum; unsigned long flags; dum = gadget_to_dummy_hcd(_gadget)->dum; spin_lock_irqsave (&dum->lock, flags); dum->pullup = (value != 0); set_link_state((dum->gadget.speed == USB_SPEED_SUPER ? dum->ss_hcd : dum->hs_hcd)); spin_unlock_irqrestore (&dum->lock, flags); usb_hcd_poll_rh_status((dum->gadget.speed == USB_SPEED_SUPER ? dummy_hcd_to_hcd(dum->ss_hcd) : dummy_hcd_to_hcd(dum->hs_hcd))); return 0; } static int dummy_udc_start(struct usb_gadget_driver *driver, int (*bind)(struct usb_gadget *)); static int dummy_udc_stop(struct usb_gadget_driver *driver); 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, .start = dummy_udc_start, .stop = dummy_udc_stop, }; /*-------------------------------------------------------------------------*/ /* "function" sysfs attribute */ static ssize_t show_function (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 (function, S_IRUGO, show_function, NULL); /*-------------------------------------------------------------------------*/ /* * 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_driver *driver, int (*bind)(struct usb_gadget *)) { struct dummy *dum = &the_controller; int retval, i; if (!dum) return -EINVAL; if (dum->driver) return -EBUSY; if (!bind || !driver->setup || driver->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; INIT_LIST_HEAD (&dum->gadget.ep_list); for (i = 0; i < DUMMY_ENDPOINTS; i++) { struct dummy_ep *ep = &dum->ep [i]; if (!ep_name [i]) break; ep->ep.name = ep_name [i]; ep->ep.ops = &dummy_ep_ops; list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list); ep->halted = ep->wedged = ep->already_seen = ep->setup_stage = 0; ep->ep.maxpacket = ~0; ep->last_io = jiffies; ep->gadget = &dum->gadget; ep->desc = NULL; INIT_LIST_HEAD (&ep->queue); } dum->gadget.ep0 = &dum->ep [0].ep; if (mod_data.is_super_speed) dum->gadget.speed = driver->speed; else if (mod_data.is_high_speed) dum->gadget.speed = min_t(u8, USB_SPEED_HIGH, driver->speed); else dum->gadget.speed = USB_SPEED_FULL; if (dum->gadget.speed < driver->speed) dev_dbg(udc_dev(dum), "This device can perform faster" " if you connect it to a %s port...\n", (driver->speed == USB_SPEED_SUPER ? "SuperSpeed" : "HighSpeed")); if (dum->gadget.speed == USB_SPEED_SUPER) { for (i = 0; i < DUMMY_ENDPOINTS; i++) dum->ep[i].ep.max_streams = 0x10; dum->ep[0].ep.maxpacket = 9; } else dum->ep[0].ep.maxpacket = 64; list_del_init (&dum->ep [0].ep.ep_list); INIT_LIST_HEAD(&dum->fifo_req.queue); driver->driver.bus = NULL; dum->driver = driver; dum->gadget.dev.driver = &driver->driver; dev_dbg (udc_dev(dum), "binding gadget driver '%s'\n", driver->driver.name); retval = bind(&dum->gadget); if (retval) { dum->driver = NULL; dum->gadget.dev.driver = NULL; return retval; } /* khubd will enumerate this in a while */ spin_lock_irq (&dum->lock); dum->pullup = 1; if (dum->gadget.speed == USB_SPEED_SUPER) { dum->gadget.is_otg = (dummy_hcd_to_hcd(dum->ss_hcd)->self.otg_port != 0); set_link_state(dum->ss_hcd); } else { dum->gadget.is_otg = (dummy_hcd_to_hcd(dum->hs_hcd)->self.otg_port != 0); set_link_state(dum->hs_hcd); } spin_unlock_irq (&dum->lock); usb_hcd_poll_rh_status((dum->gadget.speed == USB_SPEED_SUPER ? dummy_hcd_to_hcd(dum->ss_hcd) : dummy_hcd_to_hcd(dum->hs_hcd))); return 0; } static int dummy_udc_stop(struct usb_gadget_driver *driver) { struct dummy *dum = &the_controller; unsigned long flags; if (!dum) return -ENODEV; if (!driver || driver != dum->driver || !driver->unbind) return -EINVAL; dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n", driver->driver.name); spin_lock_irqsave (&dum->lock, flags); dum->pullup = 0; set_link_state((dum->gadget.speed == USB_SPEED_SUPER ? dum->ss_hcd : dum->hs_hcd)); spin_unlock_irqrestore (&dum->lock, flags); driver->unbind (&dum->gadget); dum->gadget.dev.driver = NULL; dum->driver = NULL; spin_lock_irqsave (&dum->lock, flags); dum->pullup = 0; set_link_state((dum->gadget.speed == USB_SPEED_SUPER ? dum->ss_hcd : dum->hs_hcd)); spin_unlock_irqrestore (&dum->lock, flags); usb_hcd_poll_rh_status((dum->gadget.speed == USB_SPEED_SUPER ? dummy_hcd_to_hcd(dum->ss_hcd) : dummy_hcd_to_hcd(dum->hs_hcd))); return 0; } #undef is_enabled /* just declare this in any driver that really need it */ extern int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode); int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode) { return -ENOSYS; } EXPORT_SYMBOL (net2280_set_fifo_mode); /* The gadget structure is stored inside the hcd structure and will be * released along with it. */ static void dummy_gadget_release (struct device *dev) { return; } static int dummy_udc_probe (struct platform_device *pdev) { struct dummy *dum = &the_controller; int rc; dum->gadget.name = gadget_name; dum->gadget.ops = &dummy_ops; dum->gadget.is_dualspeed = 1; dev_set_name(&dum->gadget.dev, "gadget"); dum->gadget.dev.parent = &pdev->dev; dum->gadget.dev.release = dummy_gadget_release; rc = device_register (&dum->gadget.dev); if (rc < 0) { put_device(&dum->gadget.dev); return rc; } 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: device_unregister(&dum->gadget.dev); return rc; } static int dummy_udc_remove (struct platform_device *pdev) { struct dummy *dum = platform_get_drvdata (pdev); usb_del_gadget_udc(&dum->gadget); platform_set_drvdata (pdev, NULL); device_remove_file (&dum->gadget.dev, &dev_attr_function); device_unregister (&dum->gadget.dev); return 0; } static int dummy_udc_suspend (struct platform_device *pdev, pm_message_t state) { struct dummy *dum = platform_get_drvdata(pdev); dev_dbg (&pdev->dev, "%s\n", __func__); spin_lock_irq (&dum->lock); dum->udc_suspended = 1; set_link_state((dum->gadget.speed == USB_SPEED_SUPER ? dum->ss_hcd : dum->hs_hcd)); spin_unlock_irq (&dum->lock); usb_hcd_poll_rh_status((dum->gadget.speed == USB_SPEED_SUPER ? dummy_hcd_to_hcd(dum->ss_hcd) : dummy_hcd_to_hcd(dum->hs_hcd))); return 0; } static int dummy_udc_resume (struct platform_device *pdev) { struct dummy *dum = platform_get_drvdata(pdev); dev_dbg (&pdev->dev, "%s\n", __func__); spin_lock_irq (&dum->lock); dum->udc_suspended = 0; set_link_state((dum->gadget.speed == USB_SPEED_SUPER ? dum->ss_hcd : dum->hs_hcd)); spin_unlock_irq (&dum->lock); usb_hcd_poll_rh_status((dum->gadget.speed == USB_SPEED_SUPER ? dummy_hcd_to_hcd(dum->ss_hcd) : dummy_hcd_to_hcd(dum->hs_hcd))); return 0; } static struct platform_driver dummy_udc_driver = { .probe = dummy_udc_probe, .remove = dummy_udc_remove, .suspend = dummy_udc_suspend, .resume = dummy_udc_resume, .driver = { .name = (char *) gadget_name, .owner = THIS_MODULE, }, }; /*-------------------------------------------------------------------------*/ /* MASTER/HOST SIDE DRIVER * * this uses the hcd framework to hook up to host side drivers. * its root hub will only have one device, otherwise it acts like * a normal host controller. * * when urbs are queued, they're just stuck on a list that we * scan in a timer callback. that callback connects writes from * the host with reads from the device, and so on, based on the * usb 2.0 rules. */ static int dummy_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; if (!urb->transfer_buffer && urb->transfer_buffer_length) return -EINVAL; urbp = kmalloc (sizeof *urbp, mem_flags); if (!urbp) return -ENOMEM; urbp->urb = urb; dum_hcd = hcd_to_dummy_hcd(hcd); spin_lock_irqsave(&dum_hcd->dum->lock, flags); rc = usb_hcd_link_urb_to_ep(hcd, urb); if (rc) { kfree(urbp); goto done; } if (!dum_hcd->udev) { dum_hcd->udev = urb->dev; usb_get_dev(dum_hcd->udev); } else if (unlikely(dum_hcd->udev != urb->dev)) dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n"); list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list); urb->hcpriv = urbp; if (usb_pipetype (urb->pipe) == PIPE_CONTROL) urb->error_count = 1; /* mark as a new urb */ /* kick the scheduler, it'll do the rest */ if (!timer_pending(&dum_hcd->timer)) mod_timer(&dum_hcd->timer, jiffies + 1); done: spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); return rc; } static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) { struct dummy_hcd *dum_hcd; unsigned long flags; int rc; /* giveback happens automatically in timer callback, * so make sure the callback happens */ dum_hcd = hcd_to_dummy_hcd(hcd); spin_lock_irqsave(&dum_hcd->dum->lock, flags); rc = usb_hcd_check_unlink_urb(hcd, urb, status); if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING && !list_empty(&dum_hcd->urbp_list)) mod_timer(&dum_hcd->timer, jiffies); spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); return rc; } /* transfer up to a frame's worth; caller must own lock */ static int transfer(struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit, int *status) { struct dummy_request *req; top: /* if there's no request queued, the device is NAKing; return */ list_for_each_entry (req, &ep->queue, queue) { unsigned host_len, dev_len, len; int is_short, to_host; int rescan = 0; /* 1..N packets of ep->ep.maxpacket each ... the last one * may be short (including zero length). * * writer can send a zlp explicitly (length 0) or implicitly * (length mod maxpacket zero, and 'zero' flag); they always * terminate reads. */ host_len = urb->transfer_buffer_length - urb->actual_length; dev_len = req->req.length - req->req.actual; len = min (host_len, dev_len); /* FIXME update emulated data toggle too */ to_host = usb_pipein (urb->pipe); if (unlikely (len == 0)) is_short = 1; else { char *ubuf, *rbuf; /* not enough bandwidth left? */ if (limit < ep->ep.maxpacket && limit < len) break; len = min (len, (unsigned) limit); if (len == 0) break; /* use an extra pass for the final short packet */ if (len > ep->ep.maxpacket) { rescan = 1; len -= (len % ep->ep.maxpacket); } is_short = (len % ep->ep.maxpacket) != 0; /* else transfer packet(s) */ ubuf = urb->transfer_buffer + urb->actual_length; rbuf = req->req.buf + req->req.actual; if (to_host) memcpy (ubuf, rbuf, len); else memcpy (rbuf, ubuf, len); ep->last_io = jiffies; limit -= len; urb->actual_length += len; req->req.actual += len; } /* short packets terminate, maybe with overflow/underflow. * it's only really an error to write too much. * * partially filling a buffer optionally blocks queue advances * (so completion handlers can clean up the queue) but we don't * need to emulate such data-in-flight. */ if (is_short) { if (host_len == dev_len) { req->req.status = 0; *status = 0; } else if (to_host) { req->req.status = 0; if (dev_len > host_len) *status = -EOVERFLOW; else *status = 0; } else if (!to_host) { *status = 0; if (host_len > dev_len) req->req.status = -EOVERFLOW; else req->req.status = 0; } /* many requests terminate without a short packet */ } else { if (req->req.length == req->req.actual && !req->req.zero) req->req.status = 0; if (urb->transfer_buffer_length == urb->actual_length && !(urb->transfer_flags & URB_ZERO_PACKET)) *status = 0; } /* device side completion --> continuable */ if (req->req.status != -EINPROGRESS) { list_del_init (&req->queue); spin_unlock (&dum->lock); req->req.complete (&ep->ep, &req->req); spin_lock (&dum->lock); /* requests might have been unlinked... */ rescan = 1; } /* host side completion --> terminate */ if (*status != -EINPROGRESS) break; /* rescan to continue with any other queued i/o */ if (rescan) goto top; } return limit; } static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep) { int limit = ep->ep.maxpacket; if (dum->gadget.speed == USB_SPEED_HIGH) { int tmp; /* high bandwidth mode */ tmp = le16_to_cpu(ep->desc->wMaxPacketSize); tmp = (tmp >> 11) & 0x03; tmp *= 8 /* applies to entire frame */; limit += limit * tmp; } if (dum->gadget.speed == USB_SPEED_SUPER) { switch (ep->desc->bmAttributes & 0x03) { case USB_ENDPOINT_XFER_ISOC: /* Sec. 4.4.8.2 USB3.0 Spec */ limit = 3 * 16 * 1024 * 8; break; case USB_ENDPOINT_XFER_INT: /* Sec. 4.4.7.2 USB3.0 Spec */ limit = 3 * 1024 * 8; break; case USB_ENDPOINT_XFER_BULK: default: break; } } return limit; } #define is_active(dum_hcd) ((dum_hcd->port_status & \ (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \ USB_PORT_STAT_SUSPEND)) \ == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE)) static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address) { int i; if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ? dum->ss_hcd : dum->hs_hcd))) return NULL; if ((address & ~USB_DIR_IN) == 0) return &dum->ep [0]; for (i = 1; i < DUMMY_ENDPOINTS; i++) { struct dummy_ep *ep = &dum->ep [i]; if (!ep->desc) continue; if (ep->desc->bEndpointAddress == address) return ep; } return NULL; } #undef is_active #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE) #define Dev_InRequest (Dev_Request | USB_DIR_IN) #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE) #define Intf_InRequest (Intf_Request | USB_DIR_IN) #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT) #define Ep_InRequest (Ep_Request | USB_DIR_IN) /** * handle_control_request() - handles all control transfers * @dum: pointer to dummy (the_controller) * @urb: the urb request to handle * @setup: pointer to the setup data for a USB device control * request * @status: pointer to request handling status * * Return 0 - if the request was handled * 1 - if the request wasn't handles * error code on error */ static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb, struct usb_ctrlrequest *setup, int *status) { struct dummy_ep *ep2; struct dummy *dum = dum_hcd->dum; int ret_val = 1; unsigned w_index; unsigned w_value; w_index = le16_to_cpu(setup->wIndex); w_value = le16_to_cpu(setup->wValue); switch (setup->bRequest) { case USB_REQ_SET_ADDRESS: if (setup->bRequestType != Dev_Request) break; dum->address = w_value; *status = 0; dev_dbg(udc_dev(dum), "set_address = %d\n", w_value); ret_val = 0; break; case USB_REQ_SET_FEATURE: if (setup->bRequestType == Dev_Request) { ret_val = 0; switch (w_value) { case USB_DEVICE_REMOTE_WAKEUP: break; case USB_DEVICE_B_HNP_ENABLE: dum->gadget.b_hnp_enable = 1; break; case USB_DEVICE_A_HNP_SUPPORT: dum->gadget.a_hnp_support = 1; break; case USB_DEVICE_A_ALT_HNP_SUPPORT: dum->gadget.a_alt_hnp_support = 1; break; case USB_DEVICE_U1_ENABLE: if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) w_value = USB_DEV_STAT_U1_ENABLED; else ret_val = -EOPNOTSUPP; break; case USB_DEVICE_U2_ENABLE: if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) w_value = USB_DEV_STAT_U2_ENABLED; else ret_val = -EOPNOTSUPP; break; case USB_DEVICE_LTM_ENABLE: if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) w_value = USB_DEV_STAT_LTM_ENABLED; else ret_val = -EOPNOTSUPP; break; default: ret_val = -EOPNOTSUPP; } if (ret_val == 0) { dum->devstatus |= (1 << w_value); *status = 0; } } else if (setup->bRequestType == Ep_Request) { /* endpoint halt */ ep2 = find_endpoint(dum, w_index); if (!ep2 || ep2->ep.name == ep0name) { ret_val = -EOPNOTSUPP; break; } ep2->halted = 1; ret_val = 0; *status = 0; } break; case USB_REQ_CLEAR_FEATURE: if (setup->bRequestType == Dev_Request) { ret_val = 0; switch (w_value) { case USB_DEVICE_REMOTE_WAKEUP: w_value = USB_DEVICE_REMOTE_WAKEUP; break; case USB_DEVICE_U1_ENABLE: if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) w_value = USB_DEV_STAT_U1_ENABLED; else ret_val = -EOPNOTSUPP; break; case USB_DEVICE_U2_ENABLE: if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) w_value = USB_DEV_STAT_U2_ENABLED; else ret_val = -EOPNOTSUPP; break; case USB_DEVICE_LTM_ENABLE: if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) w_value = USB_DEV_STAT_LTM_ENABLED; else ret_val = -EOPNOTSUPP; break; default: ret_val = -EOPNOTSUPP; break; } if (ret_val == 0) { dum->devstatus &= ~(1 << w_value); *status = 0; } } else if (setup->bRequestType == Ep_Request) { /* endpoint halt */ ep2 = find_endpoint(dum, w_index); if (!ep2) { ret_val = -EOPNOTSUPP; break; } if (!ep2->wedged) ep2->halted = 0; ret_val = 0; *status = 0; } break; case USB_REQ_GET_STATUS: if (setup->bRequestType == Dev_InRequest || setup->bRequestType == Intf_InRequest || setup->bRequestType == Ep_InRequest) { char *buf; /* * device: remote wakeup, selfpowered * interface: nothing * endpoint: halt */ buf = (char *)urb->transfer_buffer; if (urb->transfer_buffer_length > 0) { if (setup->bRequestType == Ep_InRequest) { ep2 = find_endpoint(dum, w_index); if (!ep2) { ret_val = -EOPNOTSUPP; break; } buf[0] = ep2->halted; } else if (setup->bRequestType == Dev_InRequest) { buf[0] = (u8)dum->devstatus; } else buf[0] = 0; } if (urb->transfer_buffer_length > 1) buf[1] = 0; urb->actual_length = min_t(u32, 2, urb->transfer_buffer_length); ret_val = 0; *status = 0; } break; } return ret_val; } /* drive both sides of the transfers; looks like irq handlers to * both drivers except the callbacks aren't in_irq(). */ static void dummy_timer(unsigned long _dum_hcd) { struct dummy_hcd *dum_hcd = (struct dummy_hcd *) _dum_hcd; struct dummy *dum = dum_hcd->dum; struct urbp *urbp, *tmp; unsigned long flags; int limit, total; int i; /* simplistic model for one frame's bandwidth */ switch (dum->gadget.speed) { case USB_SPEED_LOW: total = 8/*bytes*/ * 12/*packets*/; break; case USB_SPEED_FULL: total = 64/*bytes*/ * 19/*packets*/; break; case USB_SPEED_HIGH: total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/; break; case USB_SPEED_SUPER: /* Bus speed is 500000 bytes/ms, so use a little less */ total = 490000; break; default: dev_err(dummy_dev(dum_hcd), "bogus device speed\n"); return; } /* FIXME if HZ != 1000 this will probably misbehave ... */ /* look at each urb queued by the host side driver */ spin_lock_irqsave (&dum->lock, flags); if (!dum_hcd->udev) { dev_err(dummy_dev(dum_hcd), "timer fired with no URBs pending?\n"); spin_unlock_irqrestore (&dum->lock, flags); return; } for (i = 0; i < DUMMY_ENDPOINTS; i++) { if (!ep_name [i]) break; dum->ep [i].already_seen = 0; } restart: list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) { struct urb *urb; struct dummy_request *req; u8 address; struct dummy_ep *ep = NULL; int type; int status = -EINPROGRESS; urb = urbp->urb; if (urb->unlinked) goto return_urb; else if (dum_hcd->rh_state != DUMMY_RH_RUNNING) continue; type = usb_pipetype (urb->pipe); /* used up this frame's non-periodic bandwidth? * FIXME there's infinite bandwidth for control and * periodic transfers ... unrealistic. */ if (total <= 0 && type == PIPE_BULK) continue; /* find the gadget's ep for this request (if configured) */ address = usb_pipeendpoint (urb->pipe); if (usb_pipein (urb->pipe)) address |= USB_DIR_IN; ep = find_endpoint(dum, address); if (!ep) { /* set_configuration() disagreement */ dev_dbg(dummy_dev(dum_hcd), "no ep configured for urb %p\n", urb); status = -EPROTO; goto return_urb; } if (ep->already_seen) continue; ep->already_seen = 1; if (ep == &dum->ep [0] && urb->error_count) { ep->setup_stage = 1; /* a new urb */ urb->error_count = 0; } if (ep->halted && !ep->setup_stage) { /* NOTE: must not be iso! */ dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n", ep->ep.name, urb); status = -EPIPE; goto return_urb; } /* FIXME make sure both ends agree on maxpacket */ /* handle control requests */ if (ep == &dum->ep [0] && ep->setup_stage) { struct usb_ctrlrequest setup; int value = 1; setup = *(struct usb_ctrlrequest*) urb->setup_packet; /* paranoia, in case of stale queued data */ list_for_each_entry (req, &ep->queue, queue) { list_del_init (&req->queue); req->req.status = -EOVERFLOW; dev_dbg (udc_dev(dum), "stale req = %p\n", req); spin_unlock (&dum->lock); req->req.complete (&ep->ep, &req->req); spin_lock (&dum->lock); ep->already_seen = 0; goto restart; } /* gadget driver never sees set_address or operations * on standard feature flags. some hardware doesn't * even expose them. */ ep->last_io = jiffies; ep->setup_stage = 0; ep->halted = 0; value = handle_control_request(dum_hcd, urb, &setup, &status); /* gadget driver handles all other requests. block * until setup() returns; no reentrancy issues etc. */ if (value > 0) { spin_unlock (&dum->lock); value = dum->driver->setup (&dum->gadget, &setup); spin_lock (&dum->lock); if (value >= 0) { /* no delays (max 64KB data stage) */ limit = 64*1024; goto treat_control_like_bulk; } /* error, see below */ } if (value < 0) { if (value != -EOPNOTSUPP) dev_dbg (udc_dev(dum), "setup --> %d\n", value); status = -EPIPE; urb->actual_length = 0; } goto return_urb; } /* non-control requests */ limit = total; switch (usb_pipetype (urb->pipe)) { case PIPE_ISOCHRONOUS: /* FIXME is it urb->interval since the last xfer? * use urb->iso_frame_desc[i]. * complete whether or not ep has requests queued. * report random errors, to debug drivers. */ limit = max (limit, periodic_bytes (dum, ep)); status = -ENOSYS; break; case PIPE_INTERRUPT: /* FIXME is it urb->interval since the last xfer? * this almost certainly polls too fast. */ limit = max (limit, periodic_bytes (dum, ep)); /* FALLTHROUGH */ // case PIPE_BULK: case PIPE_CONTROL: default: treat_control_like_bulk: ep->last_io = jiffies; total = transfer(dum, 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; } static inline void ss_hub_descriptor(struct usb_hub_descriptor *desc) { memset(desc, 0, sizeof *desc); desc->bDescriptorType = 0x2a; desc->bDescLength = 12; desc->wHubCharacteristics = cpu_to_le16(0x0001); desc->bNbrPorts = 1; desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/ desc->u.ss.DeviceRemovable = 0xffff; } static inline void hub_descriptor (struct usb_hub_descriptor *desc) { memset (desc, 0, sizeof *desc); desc->bDescriptorType = 0x29; desc->bDescLength = 9; desc->wHubCharacteristics = cpu_to_le16(0x0001); desc->bNbrPorts = 1; desc->u.hs.DeviceRemovable[0] = 0xff; desc->u.hs.DeviceRemovable[1] = 0xff; } static int dummy_hub_control ( struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex, char *buf, u16 wLength ) { struct dummy_hcd *dum_hcd; int retval = 0; unsigned long flags; if (!HCD_HW_ACCESSIBLE(hcd)) return -ETIMEDOUT; dum_hcd = hcd_to_dummy_hcd(hcd); spin_lock_irqsave(&dum_hcd->dum->lock, flags); switch (typeReq) { case ClearHubFeature: break; case ClearPortFeature: switch (wValue) { case USB_PORT_FEAT_SUSPEND: if (hcd->speed == HCD_USB3) { dev_dbg(dummy_dev(dum_hcd), "USB_PORT_FEAT_SUSPEND req not " "supported for USB 3.0 roothub\n"); goto error; } if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) { /* 20msec resume signaling */ dum_hcd->resuming = 1; dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20); } break; case USB_PORT_FEAT_POWER: if (hcd->speed == HCD_USB3) { if (dum_hcd->port_status & USB_PORT_STAT_POWER) dev_dbg(dummy_dev(dum_hcd), "power-off\n"); } else if (dum_hcd->port_status & USB_SS_PORT_STAT_POWER) dev_dbg(dummy_dev(dum_hcd), "power-off\n"); /* FALLS THROUGH */ default: dum_hcd->port_status &= ~(1 << wValue); set_link_state(dum_hcd); } break; case GetHubDescriptor: if (hcd->speed == HCD_USB3 && (wLength < USB_DT_SS_HUB_SIZE || wValue != (USB_DT_SS_HUB << 8))) { dev_dbg(dummy_dev(dum_hcd), "Wrong hub descriptor type for " "USB 3.0 roothub.\n"); goto error; } if (hcd->speed == HCD_USB3) ss_hub_descriptor((struct usb_hub_descriptor *) buf); else hub_descriptor((struct usb_hub_descriptor *) buf); break; case GetHubStatus: *(__le32 *) buf = cpu_to_le32 (0); break; case GetPortStatus: if (wIndex != 1) retval = -EPIPE; /* whoever resets or resumes must GetPortStatus to * complete it!! */ if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) { dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16); dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; } if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 && time_after_eq(jiffies, dum_hcd->re_timeout)) { dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16); dum_hcd->port_status &= ~USB_PORT_STAT_RESET; if (dum_hcd->dum->pullup) { dum_hcd->port_status |= USB_PORT_STAT_ENABLE; if (hcd->speed < HCD_USB3) { switch (dum_hcd->dum->gadget.speed) { case USB_SPEED_HIGH: dum_hcd->port_status |= USB_PORT_STAT_HIGH_SPEED; break; case USB_SPEED_LOW: dum_hcd->dum->gadget.ep0-> maxpacket = 8; dum_hcd->port_status |= USB_PORT_STAT_LOW_SPEED; break; default: dum_hcd->dum->gadget.speed = USB_SPEED_FULL; break; } } } } set_link_state(dum_hcd); ((__le16 *) buf)[0] = cpu_to_le16 (dum_hcd->port_status); ((__le16 *) buf)[1] = cpu_to_le16 (dum_hcd->port_status >> 16); break; case SetHubFeature: retval = -EPIPE; break; case SetPortFeature: switch (wValue) { case USB_PORT_FEAT_LINK_STATE: if (hcd->speed != HCD_USB3) { dev_dbg(dummy_dev(dum_hcd), "USB_PORT_FEAT_LINK_STATE req not " "supported for USB 2.0 roothub\n"); goto error; } /* * Since this is dummy we don't have an actual link so * there is nothing to do for the SET_LINK_STATE cmd */ break; case USB_PORT_FEAT_U1_TIMEOUT: case USB_PORT_FEAT_U2_TIMEOUT: /* TODO: add suspend/resume support! */ if (hcd->speed != HCD_USB3) { dev_dbg(dummy_dev(dum_hcd), "USB_PORT_FEAT_U1/2_TIMEOUT req not " "supported for USB 2.0 roothub\n"); goto error; } break; case USB_PORT_FEAT_SUSPEND: /* Applicable only for USB2.0 hub */ if (hcd->speed == HCD_USB3) { dev_dbg(dummy_dev(dum_hcd), "USB_PORT_FEAT_SUSPEND req not " "supported for USB 3.0 roothub\n"); goto error; } if (dum_hcd->active) { dum_hcd->port_status |= USB_PORT_STAT_SUSPEND; /* HNP would happen here; for now we * assume b_bus_req is always true. */ set_link_state(dum_hcd); if (((1 << USB_DEVICE_B_HNP_ENABLE) & dum_hcd->dum->devstatus) != 0) dev_dbg(dummy_dev(dum_hcd), "no HNP yet!\n"); } break; case USB_PORT_FEAT_POWER: if (hcd->speed == HCD_USB3) dum_hcd->port_status |= USB_SS_PORT_STAT_POWER; else dum_hcd->port_status |= USB_PORT_STAT_POWER; set_link_state(dum_hcd); break; case USB_PORT_FEAT_BH_PORT_RESET: /* Applicable only for USB3.0 hub */ if (hcd->speed != HCD_USB3) { dev_dbg(dummy_dev(dum_hcd), "USB_PORT_FEAT_BH_PORT_RESET req not " "supported for USB 2.0 roothub\n"); goto error; } /* FALLS THROUGH */ case USB_PORT_FEAT_RESET: /* if it's already enabled, disable */ if (hcd->speed == HCD_USB3) { dum_hcd->port_status = 0; dum_hcd->port_status = (USB_SS_PORT_STAT_POWER | USB_PORT_STAT_CONNECTION | USB_PORT_STAT_RESET); } else dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE | USB_PORT_STAT_LOW_SPEED | USB_PORT_STAT_HIGH_SPEED); /* * We want to reset device status. All but the * Self powered feature */ dum_hcd->dum->devstatus &= (1 << USB_DEVICE_SELF_POWERED); /* * FIXME USB3.0: what is the correct reset signaling * interval? Is it still 50msec as for HS? */ dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50); /* FALLS THROUGH */ default: if (hcd->speed == HCD_USB3) { if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) != 0) { dum_hcd->port_status |= (1 << wValue); set_link_state(dum_hcd); } } else if ((dum_hcd->port_status & USB_PORT_STAT_POWER) != 0) { dum_hcd->port_status |= (1 << wValue); set_link_state(dum_hcd); } } break; case GetPortErrorCount: if (hcd->speed != HCD_USB3) { dev_dbg(dummy_dev(dum_hcd), "GetPortErrorCount req not " "supported for USB 2.0 roothub\n"); goto error; } /* We'll always return 0 since this is a dummy hub */ *(__le32 *) buf = cpu_to_le32(0); break; case SetHubDepth: if (hcd->speed != HCD_USB3) { dev_dbg(dummy_dev(dum_hcd), "SetHubDepth req not supported for " "USB 2.0 roothub\n"); goto error; } break; default: dev_dbg(dummy_dev(dum_hcd), "hub control req%04x v%04x i%04x l%d\n", typeReq, wValue, wIndex, wLength); error: /* "protocol stall" on error */ retval = -EPIPE; } spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); if ((dum_hcd->port_status & PORT_C_MASK) != 0) usb_hcd_poll_rh_status (hcd); return retval; } static int dummy_bus_suspend (struct usb_hcd *hcd) { struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); dev_dbg (&hcd->self.root_hub->dev, "%s\n", __func__); spin_lock_irq(&dum_hcd->dum->lock); dum_hcd->rh_state = DUMMY_RH_SUSPENDED; set_link_state(dum_hcd); hcd->state = HC_STATE_SUSPENDED; spin_unlock_irq(&dum_hcd->dum->lock); return 0; } static int dummy_bus_resume (struct usb_hcd *hcd) { struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); int rc = 0; dev_dbg (&hcd->self.root_hub->dev, "%s\n", __func__); spin_lock_irq(&dum_hcd->dum->lock); if (!HCD_HW_ACCESSIBLE(hcd)) { rc = -ESHUTDOWN; } else { dum_hcd->rh_state = DUMMY_RH_RUNNING; set_link_state(dum_hcd); if (!list_empty(&dum_hcd->urbp_list)) mod_timer(&dum_hcd->timer, jiffies); hcd->state = HC_STATE_RUNNING; } spin_unlock_irq(&dum_hcd->dum->lock); return rc; } /*-------------------------------------------------------------------------*/ static inline ssize_t show_urb (char *buf, size_t size, struct urb *urb) { int ep = usb_pipeendpoint (urb->pipe); return snprintf (buf, size, "urb/%p %s ep%d%s%s len %d/%d\n", urb, ({ char *s; switch (urb->dev->speed) { case USB_SPEED_LOW: s = "ls"; break; case USB_SPEED_FULL: s = "fs"; break; case USB_SPEED_HIGH: s = "hs"; break; case USB_SPEED_SUPER: s = "ss"; break; default: s = "?"; break; }; s; }), ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "", ({ char *s; \ switch (usb_pipetype (urb->pipe)) { \ case PIPE_CONTROL: \ s = ""; \ break; \ case PIPE_BULK: \ s = "-bulk"; \ break; \ case PIPE_INTERRUPT: \ s = "-int"; \ break; \ default: \ s = "-iso"; \ break; \ }; s;}), urb->actual_length, urb->transfer_buffer_length); } static ssize_t show_urbs (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 (urbs, S_IRUGO, show_urbs, NULL); static int dummy_start_ss(struct dummy_hcd *dum_hcd) { init_timer(&dum_hcd->timer); dum_hcd->timer.function = dummy_timer; dum_hcd->timer.data = (unsigned long)dum_hcd; dum_hcd->rh_state = DUMMY_RH_RUNNING; INIT_LIST_HEAD(&dum_hcd->urbp_list); dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET; dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING; dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1; #ifdef CONFIG_USB_OTG dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1; #endif return 0; /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); } static int dummy_start(struct usb_hcd *hcd) { struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); /* * MASTER side init ... we emulate a root hub that'll only ever * talk to one device (the slave side). Also appears in sysfs, * just like more familiar pci-based HCDs. */ if (!usb_hcd_is_primary_hcd(hcd)) return dummy_start_ss(dum_hcd); spin_lock_init(&dum_hcd->dum->lock); init_timer(&dum_hcd->timer); dum_hcd->timer.function = dummy_timer; dum_hcd->timer.data = (unsigned long)dum_hcd; dum_hcd->rh_state = DUMMY_RH_RUNNING; INIT_LIST_HEAD(&dum_hcd->urbp_list); hcd->power_budget = POWER_BUDGET; hcd->state = HC_STATE_RUNNING; hcd->uses_new_polling = 1; #ifdef CONFIG_USB_OTG hcd->self.otg_port = 1; #endif /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); } static void dummy_stop (struct usb_hcd *hcd) { struct dummy *dum; dum = (hcd_to_dummy_hcd(hcd))->dum; device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs); usb_gadget_unregister_driver(dum->driver); 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) { if (usb_hcd_is_primary_hcd(hcd)) { the_controller.hs_hcd = hcd_to_dummy_hcd(hcd); the_controller.hs_hcd->dum = &the_controller; /* * 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 { the_controller.ss_hcd = hcd_to_dummy_hcd(hcd); the_controller.ss_hcd->dum = &the_controller; 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 */ 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) { if (hcd->speed != HCD_USB3) dev_dbg(dummy_dev(hcd_to_dummy_hcd(hcd)), "%s() - ERROR! Not supported for USB2.0 roothub\n", __func__); return 0; } /* Reverts a group of bulk endpoints back to not using stream IDs. */ 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) { if (hcd->speed != HCD_USB3) dev_dbg(dummy_dev(hcd_to_dummy_hcd(hcd)), "%s() - ERROR! Not supported for USB2.0 roothub\n", __func__); return 0; } static struct hc_driver dummy_hcd = { .description = (char *) driver_name, .product_desc = "Dummy host controller", .hcd_priv_size = sizeof(struct dummy_hcd), .flags = HCD_USB3 | HCD_SHARED, .reset = dummy_setup, .start = dummy_start, .stop = dummy_stop, .urb_enqueue = dummy_urb_enqueue, .urb_dequeue = dummy_urb_dequeue, .get_frame_number = dummy_h_get_frame, .hub_status_data = dummy_hub_status, .hub_control = dummy_hub_control, .bus_suspend = dummy_bus_suspend, .bus_resume = dummy_bus_resume, .alloc_streams = dummy_alloc_streams, .free_streams = dummy_free_streams, }; static int dummy_hcd_probe(struct platform_device *pdev) { struct usb_hcd *hs_hcd; struct usb_hcd *ss_hcd; int retval; dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc); if (!mod_data.is_super_speed) dummy_hcd.flags = HCD_USB2; hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev)); if (!hs_hcd) return -ENOMEM; hs_hcd->has_tt = 1; retval = usb_add_hcd(hs_hcd, 0, 0); if (retval != 0) { usb_put_hcd(hs_hcd); return retval; } 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_put_hcd(hs_hcd); the_controller.hs_hcd = the_controller.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)); the_controller.hs_hcd = NULL; the_controller.ss_hcd = NULL; return 0; } static int dummy_hcd_suspend (struct platform_device *pdev, pm_message_t state) { struct usb_hcd *hcd; struct dummy_hcd *dum_hcd; int rc = 0; dev_dbg (&pdev->dev, "%s\n", __func__); hcd = platform_get_drvdata (pdev); dum_hcd = hcd_to_dummy_hcd(hcd); if (dum_hcd->rh_state == DUMMY_RH_RUNNING) { dev_warn(&pdev->dev, "Root hub isn't suspended!\n"); rc = -EBUSY; } else clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); return rc; } static int dummy_hcd_resume (struct platform_device *pdev) { struct usb_hcd *hcd; dev_dbg (&pdev->dev, "%s\n", __func__); hcd = platform_get_drvdata (pdev); set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); usb_hcd_poll_rh_status (hcd); return 0; } static struct platform_driver dummy_hcd_driver = { .probe = dummy_hcd_probe, .remove = dummy_hcd_remove, .suspend = dummy_hcd_suspend, .resume = dummy_hcd_resume, .driver = { .name = (char *) driver_name, .owner = THIS_MODULE, }, }; /*-------------------------------------------------------------------------*/ static struct platform_device *the_udc_pdev; static struct platform_device *the_hcd_pdev; static int __init init (void) { int retval = -ENOMEM; if (usb_disabled ()) return -ENODEV; if (!mod_data.is_high_speed && mod_data.is_super_speed) return -EINVAL; the_hcd_pdev = platform_device_alloc(driver_name, -1); if (!the_hcd_pdev) return retval; the_udc_pdev = platform_device_alloc(gadget_name, -1); if (!the_udc_pdev) goto err_alloc_udc; retval = platform_driver_register(&dummy_hcd_driver); if (retval < 0) goto err_register_hcd_driver; retval = platform_driver_register(&dummy_udc_driver); if (retval < 0) goto err_register_udc_driver; retval = platform_device_add(the_hcd_pdev); if (retval < 0) goto err_add_hcd; if (!the_controller.hs_hcd || (!the_controller.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; } retval = platform_device_add(the_udc_pdev); if (retval < 0) goto err_add_udc; if (!platform_get_drvdata(the_udc_pdev)) { /* * The udc was added successfully but its probe function failed * for some reason. */ retval = -EINVAL; goto err_probe_udc; } return retval; err_probe_udc: platform_device_del(the_udc_pdev); err_add_udc: platform_device_del(the_hcd_pdev); err_add_hcd: platform_driver_unregister(&dummy_udc_driver); err_register_udc_driver: platform_driver_unregister(&dummy_hcd_driver); err_register_hcd_driver: platform_device_put(the_udc_pdev); err_alloc_udc: platform_device_put(the_hcd_pdev); return retval; } module_init (init); static void __exit cleanup (void) { platform_device_unregister(the_udc_pdev); platform_device_unregister(the_hcd_pdev); platform_driver_unregister(&dummy_udc_driver); platform_driver_unregister(&dummy_hcd_driver); } module_exit (cleanup);