| /* |
| * dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver. |
| * |
| * Maintainer: Alan Stern <stern@rowland.harvard.edu> |
| * |
| * Copyright (C) 2003 David Brownell |
| * Copyright (C) 2003-2005 Alan Stern |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| */ |
| |
| |
| /* |
| * This exposes a device side "USB gadget" API, driven by requests to a |
| * Linux-USB host controller driver. USB traffic is simulated; there's |
| * no need for USB hardware. Use this with two other drivers: |
| * |
| * - Gadget driver, responding to requests (slave); |
| * - Host-side device driver, as already familiar in Linux. |
| * |
| * Having this all in one kernel can help some stages of development, |
| * bypassing some hardware (and driver) issues. UML could help too. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/delay.h> |
| #include <linux/ioport.h> |
| #include <linux/slab.h> |
| #include <linux/errno.h> |
| #include <linux/init.h> |
| #include <linux/timer.h> |
| #include <linux/list.h> |
| #include <linux/interrupt.h> |
| #include <linux/platform_device.h> |
| #include <linux/usb.h> |
| #include <linux/usb/gadget.h> |
| #include <linux/usb/hcd.h> |
| #include <linux/scatterlist.h> |
| |
| #include <asm/byteorder.h> |
| #include <linux/io.h> |
| #include <asm/irq.h> |
| #include <asm/unaligned.h> |
| |
| #define DRIVER_DESC "USB Host+Gadget Emulator" |
| #define DRIVER_VERSION "02 May 2005" |
| |
| #define POWER_BUDGET 500 /* in mA; use 8 for low-power port testing */ |
| |
| static const char driver_name[] = "dummy_hcd"; |
| static const char driver_desc[] = "USB Host+Gadget Emulator"; |
| |
| static const char gadget_name[] = "dummy_udc"; |
| |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_AUTHOR("David Brownell"); |
| MODULE_LICENSE("GPL"); |
| |
| struct dummy_hcd_module_parameters { |
| bool is_super_speed; |
| bool is_high_speed; |
| }; |
| |
| 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; |
| unsigned stream_en:1; |
| }; |
| |
| struct dummy_request { |
| struct list_head queue; /* ep's requests */ |
| struct usb_request req; |
| }; |
| |
| static inline struct dummy_ep *usb_ep_to_dummy_ep(struct usb_ep *_ep) |
| { |
| return container_of(_ep, struct dummy_ep, ep); |
| } |
| |
| static inline struct dummy_request *usb_request_to_dummy_request |
| (struct usb_request *_req) |
| { |
| return container_of(_req, struct dummy_request, req); |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| /* |
| * Every device has ep0 for control requests, plus up to 30 more endpoints, |
| * in one of two types: |
| * |
| * - Configurable: direction (in/out), type (bulk, iso, etc), and endpoint |
| * number can be changed. Names like "ep-a" are used for this type. |
| * |
| * - Fixed Function: in other cases. some characteristics may be mutable; |
| * that'd be hardware-specific. Names like "ep12out-bulk" are used. |
| * |
| * Gadget drivers are responsible for not setting up conflicting endpoint |
| * configurations, illegal or unsupported packet lengths, and so on. |
| */ |
| |
| static const char ep0name[] = "ep0"; |
| |
| static const char *const ep_name[] = { |
| ep0name, /* everyone has ep0 */ |
| |
| /* act like a 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; |
| struct sg_mapping_iter miter; |
| u32 miter_started; |
| }; |
| |
| |
| enum dummy_rh_state { |
| DUMMY_RH_RESET, |
| DUMMY_RH_SUSPENDED, |
| DUMMY_RH_RUNNING |
| }; |
| |
| struct dummy_hcd { |
| struct dummy *dum; |
| enum dummy_rh_state rh_state; |
| struct timer_list timer; |
| u32 port_status; |
| u32 old_status; |
| unsigned long re_timeout; |
| |
| struct usb_device *udev; |
| struct list_head urbp_list; |
| u32 stream_en_ep; |
| u8 num_stream[30 / 2]; |
| |
| unsigned active:1; |
| unsigned old_active:1; |
| unsigned resuming:1; |
| }; |
| |
| struct dummy { |
| spinlock_t lock; |
| |
| /* |
| * SLAVE/GADGET side support |
| */ |
| struct dummy_ep ep[DUMMY_ENDPOINTS]; |
| int address; |
| struct usb_gadget gadget; |
| struct usb_gadget_driver *driver; |
| struct dummy_request fifo_req; |
| u8 fifo_buf[FIFO_SIZE]; |
| u16 devstatus; |
| unsigned udc_suspended:1; |
| unsigned pullup:1; |
| |
| /* |
| * MASTER/HOST side support |
| */ |
| struct dummy_hcd *hs_hcd; |
| struct dummy_hcd *ss_hcd; |
| }; |
| |
| static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd) |
| { |
| return (struct dummy_hcd *) (hcd->hcd_priv); |
| } |
| |
| static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum) |
| { |
| return container_of((void *) dum, struct usb_hcd, hcd_priv); |
| } |
| |
| static inline struct device *dummy_dev(struct dummy_hcd *dum) |
| { |
| return dummy_hcd_to_hcd(dum)->self.controller; |
| } |
| |
| static inline struct device *udc_dev(struct dummy *dum) |
| { |
| return dum->gadget.dev.parent; |
| } |
| |
| static inline struct dummy *ep_to_dummy(struct dummy_ep *ep) |
| { |
| return container_of(ep->gadget, struct dummy, gadget); |
| } |
| |
| static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget) |
| { |
| struct dummy *dum = container_of(gadget, struct dummy, gadget); |
| if (dum->gadget.speed == USB_SPEED_SUPER) |
| return dum->ss_hcd; |
| else |
| return dum->hs_hcd; |
| } |
| |
| static inline struct dummy *gadget_dev_to_dummy(struct device *dev) |
| { |
| return container_of(dev, struct dummy, gadget.dev); |
| } |
| |
| 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; |
| |
| dum_hcd = gadget_to_dummy_hcd(&dum->gadget); |
| if (!is_enabled(dum_hcd)) |
| return -ESHUTDOWN; |
| |
| /* |
| * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the |
| * maximum packet size. |
| * For SS devices the wMaxPacketSize is limited by 1024. |
| */ |
| max = usb_endpoint_maxp(desc) & 0x7ff; |
| |
| /* drivers must not request bad settings, since lower levels |
| * (hardware or its drivers) may not check. some endpoints |
| * can't do iso, many have maxpacket limitations, etc. |
| * |
| * since this "hardware" driver is here to help debugging, we |
| * have some extra sanity checks. (there could be more though, |
| * especially for "ep9out" style fixed function ones.) |
| */ |
| retval = -EINVAL; |
| switch (usb_endpoint_type(desc)) { |
| case USB_ENDPOINT_XFER_BULK: |
| if (strstr(ep->ep.name, "-iso") |
| || strstr(ep->ep.name, "-int")) { |
| goto done; |
| } |
| switch (dum->gadget.speed) { |
| case USB_SPEED_SUPER: |
| if (max == 1024) |
| break; |
| goto done; |
| case USB_SPEED_HIGH: |
| if (max == 512) |
| break; |
| goto done; |
| case USB_SPEED_FULL: |
| if (max == 8 || max == 16 || max == 32 || max == 64) |
| /* we'll fake any legal size */ |
| break; |
| /* save a return statement */ |
| default: |
| goto done; |
| } |
| break; |
| case USB_ENDPOINT_XFER_INT: |
| if (strstr(ep->ep.name, "-iso")) /* bulk is ok */ |
| goto done; |
| /* real hardware might not handle all packet sizes */ |
| switch (dum->gadget.speed) { |
| case USB_SPEED_SUPER: |
| case USB_SPEED_HIGH: |
| if (max <= 1024) |
| break; |
| /* save a return statement */ |
| case USB_SPEED_FULL: |
| if (max <= 64) |
| break; |
| /* save a return statement */ |
| default: |
| if (max <= 8) |
| break; |
| goto done; |
| } |
| break; |
| case USB_ENDPOINT_XFER_ISOC: |
| if (strstr(ep->ep.name, "-bulk") |
| || strstr(ep->ep.name, "-int")) |
| goto done; |
| /* real hardware might not handle all packet sizes */ |
| switch (dum->gadget.speed) { |
| case USB_SPEED_SUPER: |
| case USB_SPEED_HIGH: |
| if (max <= 1024) |
| break; |
| /* save a return statement */ |
| case USB_SPEED_FULL: |
| if (max <= 1023) |
| break; |
| /* save a return statement */ |
| default: |
| goto done; |
| } |
| break; |
| default: |
| /* few chips support control except on ep0 */ |
| goto done; |
| } |
| |
| _ep->maxpacket = max; |
| if (usb_ss_max_streams(_ep->comp_desc)) { |
| if (!usb_endpoint_xfer_bulk(desc)) { |
| dev_err(udc_dev(dum), "Can't enable stream support on " |
| "non-bulk ep %s\n", _ep->name); |
| return -EINVAL; |
| } |
| ep->stream_en = 1; |
| } |
| ep->desc = desc; |
| |
| dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n", |
| _ep->name, |
| desc->bEndpointAddress & 0x0f, |
| (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out", |
| ({ char *val; |
| switch (usb_endpoint_type(desc)) { |
| case USB_ENDPOINT_XFER_BULK: |
| val = "bulk"; |
| break; |
| case USB_ENDPOINT_XFER_ISOC: |
| val = "iso"; |
| break; |
| case USB_ENDPOINT_XFER_INT: |
| val = "intr"; |
| break; |
| default: |
| val = "ctrl"; |
| break; |
| }; val; }), |
| max, ep->stream_en ? "enabled" : "disabled"); |
| |
| /* at this point real hardware should be NAKing transfers |
| * to that endpoint, until a buffer is queued to it. |
| */ |
| ep->halted = ep->wedged = 0; |
| retval = 0; |
| done: |
| return retval; |
| } |
| |
| static int dummy_disable(struct usb_ep *_ep) |
| { |
| struct dummy_ep *ep; |
| struct dummy *dum; |
| unsigned long flags; |
| 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; |
| ep->stream_en = 0; |
| 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_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; |
| _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 void dummy_udc_update_ep0(struct dummy *dum) |
| { |
| if (dum->gadget.speed == USB_SPEED_SUPER) |
| dum->ep[0].ep.maxpacket = 9; |
| else |
| dum->ep[0].ep.maxpacket = 64; |
| } |
| |
| static int dummy_pullup(struct usb_gadget *_gadget, int value) |
| { |
| struct dummy_hcd *dum_hcd; |
| struct dummy *dum; |
| unsigned long flags; |
| |
| dum = gadget_dev_to_dummy(&_gadget->dev); |
| |
| if (value && dum->driver) { |
| if (mod_data.is_super_speed) |
| dum->gadget.speed = dum->driver->max_speed; |
| else if (mod_data.is_high_speed) |
| dum->gadget.speed = min_t(u8, USB_SPEED_HIGH, |
| dum->driver->max_speed); |
| else |
| dum->gadget.speed = USB_SPEED_FULL; |
| dummy_udc_update_ep0(dum); |
| |
| if (dum->gadget.speed < dum->driver->max_speed) |
| dev_dbg(udc_dev(dum), "This device can perform faster" |
| " if you connect it to a %s port...\n", |
| usb_speed_string(dum->driver->max_speed)); |
| } |
| dum_hcd = gadget_to_dummy_hcd(_gadget); |
| |
| spin_lock_irqsave(&dum->lock, flags); |
| dum->pullup = (value != 0); |
| set_link_state(dum_hcd); |
| spin_unlock_irqrestore(&dum->lock, flags); |
| |
| usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); |
| return 0; |
| } |
| |
| static int dummy_udc_start(struct usb_gadget *g, |
| struct usb_gadget_driver *driver); |
| static int dummy_udc_stop(struct usb_gadget *g, |
| 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, |
| .udc_start = dummy_udc_start, |
| .udc_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 *g, |
| struct usb_gadget_driver *driver) |
| { |
| struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g); |
| struct dummy *dum = dum_hcd->dum; |
| |
| if (driver->max_speed == USB_SPEED_UNKNOWN) |
| return -EINVAL; |
| |
| /* |
| * SLAVE side init ... the layer above hardware, which |
| * can't enumerate without help from the driver we're binding. |
| */ |
| |
| dum->devstatus = 0; |
| |
| dum->driver = driver; |
| dum->gadget.dev.driver = &driver->driver; |
| dev_dbg(udc_dev(dum), "binding gadget driver '%s'\n", |
| driver->driver.name); |
| return 0; |
| } |
| |
| static int dummy_udc_stop(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; |
| |
| dev_dbg(udc_dev(dum), "unregister gadget driver '%s'\n", |
| driver->driver.name); |
| |
| dum->gadget.dev.driver = NULL; |
| dum->driver = NULL; |
| |
| return 0; |
| } |
| |
| #undef is_enabled |
| |
| /* The gadget structure is stored inside the hcd structure and will be |
| * released along with it. */ |
| static void dummy_gadget_release(struct device *dev) |
| { |
| return; |
| } |
| |
| static void init_dummy_udc_hw(struct dummy *dum) |
| { |
| int i; |
| |
| INIT_LIST_HEAD(&dum->gadget.ep_list); |
| for (i = 0; i < DUMMY_ENDPOINTS; i++) { |
| struct dummy_ep *ep = &dum->ep[i]; |
| |
| if (!ep_name[i]) |
| break; |
| ep->ep.name = ep_name[i]; |
| ep->ep.ops = &dummy_ep_ops; |
| list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list); |
| ep->halted = ep->wedged = ep->already_seen = |
| ep->setup_stage = 0; |
| ep->ep.maxpacket = ~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 = &the_controller; |
| int rc; |
| |
| dum->gadget.name = gadget_name; |
| dum->gadget.ops = &dummy_ops; |
| dum->gadget.max_speed = USB_SPEED_SUPER; |
| |
| 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; |
| } |
| |
| 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: |
| 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 void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd, |
| int suspend) |
| { |
| spin_lock_irq(&dum->lock); |
| dum->udc_suspended = suspend; |
| set_link_state(dum_hcd); |
| spin_unlock_irq(&dum->lock); |
| } |
| |
| static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state) |
| { |
| struct dummy *dum = platform_get_drvdata(pdev); |
| struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget); |
| |
| dev_dbg(&pdev->dev, "%s\n", __func__); |
| dummy_udc_pm(dum, dum_hcd, 1); |
| usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); |
| return 0; |
| } |
| |
| static int dummy_udc_resume(struct platform_device *pdev) |
| { |
| struct dummy *dum = platform_get_drvdata(pdev); |
| struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget); |
| |
| dev_dbg(&pdev->dev, "%s\n", __func__); |
| dummy_udc_pm(dum, dum_hcd, 0); |
| usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); |
| return 0; |
| } |
| |
| static struct platform_driver dummy_udc_driver = { |
| .probe = dummy_udc_probe, |
| .remove = dummy_udc_remove, |
| .suspend = dummy_udc_suspend, |
| .resume = dummy_udc_resume, |
| .driver = { |
| .name = (char *) gadget_name, |
| .owner = THIS_MODULE, |
| }, |
| }; |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc) |
| { |
| unsigned int index; |
| |
| index = usb_endpoint_num(desc) << 1; |
| if (usb_endpoint_dir_in(desc)) |
| index |= 1; |
| return index; |
| } |
| |
| /* MASTER/HOST SIDE DRIVER |
| * |
| * this uses the hcd framework to hook up to host side drivers. |
| * its root hub will only have one device, otherwise it acts like |
| * a normal host controller. |
| * |
| * when urbs are queued, they're just stuck on a list that we |
| * scan in a timer callback. that callback connects writes from |
| * the host with reads from the device, and so on, based on the |
| * usb 2.0 rules. |
| */ |
| |
| static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb) |
| { |
| const struct usb_endpoint_descriptor *desc = &urb->ep->desc; |
| u32 index; |
| |
| if (!usb_endpoint_xfer_bulk(desc)) |
| return 0; |
| |
| index = dummy_get_ep_idx(desc); |
| return (1 << index) & dum_hcd->stream_en_ep; |
| } |
| |
| /* |
| * The max stream number is saved as a nibble so for the 30 possible endpoints |
| * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0 |
| * means we use only 1 stream). The maximum according to the spec is 16bit so |
| * if the 16 stream limit is about to go, the array size should be incremented |
| * to 30 elements of type u16. |
| */ |
| static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd, |
| unsigned int pipe) |
| { |
| int max_streams; |
| |
| max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)]; |
| if (usb_pipeout(pipe)) |
| max_streams >>= 4; |
| else |
| max_streams &= 0xf; |
| max_streams++; |
| return max_streams; |
| } |
| |
| static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd, |
| unsigned int pipe, unsigned int streams) |
| { |
| int max_streams; |
| |
| streams--; |
| max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)]; |
| if (usb_pipeout(pipe)) { |
| streams <<= 4; |
| max_streams &= 0xf; |
| } else { |
| max_streams &= 0xf0; |
| } |
| max_streams |= streams; |
| dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams; |
| } |
| |
| static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb) |
| { |
| unsigned int max_streams; |
| int enabled; |
| |
| enabled = dummy_ep_stream_en(dum_hcd, urb); |
| if (!urb->stream_id) { |
| if (enabled) |
| return -EINVAL; |
| return 0; |
| } |
| if (!enabled) |
| return -EINVAL; |
| |
| max_streams = get_max_streams_for_pipe(dum_hcd, |
| usb_pipeendpoint(urb->pipe)); |
| if (urb->stream_id > max_streams) { |
| dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n", |
| urb->stream_id); |
| BUG(); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static int dummy_urb_enqueue( |
| struct usb_hcd *hcd, |
| struct urb *urb, |
| gfp_t mem_flags |
| ) { |
| struct dummy_hcd *dum_hcd; |
| struct urbp *urbp; |
| unsigned long flags; |
| int rc; |
| |
| urbp = kmalloc(sizeof *urbp, mem_flags); |
| if (!urbp) |
| return -ENOMEM; |
| urbp->urb = urb; |
| urbp->miter_started = 0; |
| |
| dum_hcd = hcd_to_dummy_hcd(hcd); |
| spin_lock_irqsave(&dum_hcd->dum->lock, flags); |
| |
| rc = dummy_validate_stream(dum_hcd, urb); |
| if (rc) { |
| kfree(urbp); |
| goto done; |
| } |
| |
| rc = usb_hcd_link_urb_to_ep(hcd, urb); |
| if (rc) { |
| kfree(urbp); |
| goto done; |
| } |
| |
| if (!dum_hcd->udev) { |
| dum_hcd->udev = urb->dev; |
| usb_get_dev(dum_hcd->udev); |
| } else if (unlikely(dum_hcd->udev != urb->dev)) |
| dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n"); |
| |
| list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list); |
| urb->hcpriv = urbp; |
| if (usb_pipetype(urb->pipe) == PIPE_CONTROL) |
| urb->error_count = 1; /* mark as a new urb */ |
| |
| /* kick the scheduler, it'll do the rest */ |
| if (!timer_pending(&dum_hcd->timer)) |
| mod_timer(&dum_hcd->timer, jiffies + 1); |
| |
| done: |
| spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); |
| return rc; |
| } |
| |
| static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) |
| { |
| struct dummy_hcd *dum_hcd; |
| unsigned long flags; |
| int rc; |
| |
| /* giveback happens automatically in timer callback, |
| * so make sure the callback happens */ |
| dum_hcd = hcd_to_dummy_hcd(hcd); |
| spin_lock_irqsave(&dum_hcd->dum->lock, flags); |
| |
| rc = usb_hcd_check_unlink_urb(hcd, urb, status); |
| if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING && |
| !list_empty(&dum_hcd->urbp_list)) |
| mod_timer(&dum_hcd->timer, jiffies); |
| |
| spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); |
| return rc; |
| } |
| |
| static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req, |
| u32 len) |
| { |
| void *ubuf, *rbuf; |
| struct urbp *urbp = urb->hcpriv; |
| int to_host; |
| struct sg_mapping_iter *miter = &urbp->miter; |
| u32 trans = 0; |
| u32 this_sg; |
| bool next_sg; |
| |
| to_host = usb_pipein(urb->pipe); |
| rbuf = req->req.buf + req->req.actual; |
| |
| if (!urb->num_sgs) { |
| ubuf = urb->transfer_buffer + urb->actual_length; |
| if (to_host) |
| memcpy(ubuf, rbuf, len); |
| else |
| memcpy(rbuf, ubuf, len); |
| return len; |
| } |
| |
| if (!urbp->miter_started) { |
| u32 flags = SG_MITER_ATOMIC; |
| |
| if (to_host) |
| flags |= SG_MITER_TO_SG; |
| else |
| flags |= SG_MITER_FROM_SG; |
| |
| sg_miter_start(miter, urb->sg, urb->num_sgs, flags); |
| urbp->miter_started = 1; |
| } |
| next_sg = sg_miter_next(miter); |
| if (next_sg == false) { |
| WARN_ON_ONCE(1); |
| return -EINVAL; |
| } |
| do { |
| ubuf = miter->addr; |
| this_sg = min_t(u32, len, miter->length); |
| miter->consumed = this_sg; |
| trans += this_sg; |
| |
| if (to_host) |
| memcpy(ubuf, rbuf, this_sg); |
| else |
| memcpy(rbuf, ubuf, this_sg); |
| len -= this_sg; |
| |
| if (!len) |
| break; |
| next_sg = sg_miter_next(miter); |
| if (next_sg == false) { |
| WARN_ON_ONCE(1); |
| return -EINVAL; |
| } |
| |
| rbuf += this_sg; |
| } while (1); |
| |
| sg_miter_stop(miter); |
| return trans; |
| } |
| |
| /* transfer up to a frame's worth; caller must own lock */ |
| static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb, |
| struct dummy_ep *ep, int limit, int *status) |
| { |
| struct dummy *dum = dum_hcd->dum; |
| struct dummy_request *req; |
| |
| top: |
| /* if there's no request queued, the device is NAKing; return */ |
| list_for_each_entry(req, &ep->queue, queue) { |
| unsigned host_len, dev_len, len; |
| int is_short, to_host; |
| int rescan = 0; |
| |
| if (dummy_ep_stream_en(dum_hcd, urb)) { |
| if ((urb->stream_id != req->req.stream_id)) |
| continue; |
| } |
| |
| /* 1..N packets of ep->ep.maxpacket each ... the last one |
| * may be short (including zero length). |
| * |
| * writer can send a zlp explicitly (length 0) or implicitly |
| * (length mod maxpacket zero, and 'zero' flag); they always |
| * terminate reads. |
| */ |
| host_len = urb->transfer_buffer_length - urb->actual_length; |
| dev_len = req->req.length - req->req.actual; |
| len = min(host_len, dev_len); |
| |
| /* FIXME update emulated data toggle too */ |
| |
| to_host = usb_pipein(urb->pipe); |
| if (unlikely(len == 0)) |
| is_short = 1; |
| else { |
| /* not enough bandwidth left? */ |
| if (limit < ep->ep.maxpacket && limit < len) |
| break; |
| len = min_t(unsigned, len, limit); |
| if (len == 0) |
| break; |
| |
| /* use an extra pass for the final short packet */ |
| if (len > ep->ep.maxpacket) { |
| rescan = 1; |
| len -= (len % ep->ep.maxpacket); |
| } |
| is_short = (len % ep->ep.maxpacket) != 0; |
| |
| len = dummy_perform_transfer(urb, req, len); |
| |
| ep->last_io = jiffies; |
| if ((int)len < 0) { |
| req->req.status = len; |
| } else { |
| limit -= len; |
| urb->actual_length += len; |
| req->req.actual += len; |
| } |
| } |
| |
| /* short packets terminate, maybe with overflow/underflow. |
| * it's only really an error to write too much. |
| * |
| * partially filling a buffer optionally blocks queue advances |
| * (so completion handlers can clean up the queue) but we don't |
| * need to emulate such data-in-flight. |
| */ |
| if (is_short) { |
| if (host_len == dev_len) { |
| req->req.status = 0; |
| *status = 0; |
| } else if (to_host) { |
| req->req.status = 0; |
| if (dev_len > host_len) |
| *status = -EOVERFLOW; |
| else |
| *status = 0; |
| } else if (!to_host) { |
| *status = 0; |
| if (host_len > dev_len) |
| req->req.status = -EOVERFLOW; |
| else |
| req->req.status = 0; |
| } |
| |
| /* many requests terminate without a short packet */ |
| } else { |
| if (req->req.length == req->req.actual |
| && !req->req.zero) |
| req->req.status = 0; |
| if (urb->transfer_buffer_length == urb->actual_length |
| && !(urb->transfer_flags |
| & URB_ZERO_PACKET)) |
| *status = 0; |
| } |
| |
| /* device side completion --> continuable */ |
| if (req->req.status != -EINPROGRESS) { |
| list_del_init(&req->queue); |
| |
| spin_unlock(&dum->lock); |
| 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 = usb_endpoint_maxp(ep->desc); |
| tmp = (tmp >> 11) & 0x03; |
| tmp *= 8 /* applies to entire frame */; |
| limit += limit * tmp; |
| } |
| if (dum->gadget.speed == USB_SPEED_SUPER) { |
| switch (usb_endpoint_type(ep->desc)) { |
| case USB_ENDPOINT_XFER_ISOC: |
| /* Sec. 4.4.8.2 USB3.0 Spec */ |
| limit = 3 * 16 * 1024 * 8; |
| break; |
| case USB_ENDPOINT_XFER_INT: |
| /* Sec. 4.4.7.2 USB3.0 Spec */ |
| limit = 3 * 1024 * 8; |
| break; |
| case USB_ENDPOINT_XFER_BULK: |
| default: |
| break; |
| } |
| } |
| return limit; |
| } |
| |
| #define is_active(dum_hcd) ((dum_hcd->port_status & \ |
| (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \ |
| USB_PORT_STAT_SUSPEND)) \ |
| == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE)) |
| |
| static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address) |
| { |
| int i; |
| |
| if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ? |
| dum->ss_hcd : dum->hs_hcd))) |
| return NULL; |
| if ((address & ~USB_DIR_IN) == 0) |
| return &dum->ep[0]; |
| for (i = 1; i < DUMMY_ENDPOINTS; i++) { |
| struct dummy_ep *ep = &dum->ep[i]; |
| |
| if (!ep->desc) |
| continue; |
| if (ep->desc->bEndpointAddress == address) |
| return ep; |
| } |
| return NULL; |
| } |
| |
| #undef is_active |
| |
| #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE) |
| #define Dev_InRequest (Dev_Request | USB_DIR_IN) |
| #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE) |
| #define Intf_InRequest (Intf_Request | USB_DIR_IN) |
| #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT) |
| #define Ep_InRequest (Ep_Request | USB_DIR_IN) |
| |
| |
| /** |
| * handle_control_request() - handles all control transfers |
| * @dum: pointer to dummy (the_controller) |
| * @urb: the urb request to handle |
| * @setup: pointer to the setup data for a USB device control |
| * request |
| * @status: pointer to request handling status |
| * |
| * Return 0 - if the request was handled |
| * 1 - if the request wasn't handles |
| * error code on error |
| */ |
| static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb, |
| struct usb_ctrlrequest *setup, |
| int *status) |
| { |
| struct dummy_ep *ep2; |
| struct dummy *dum = dum_hcd->dum; |
| int ret_val = 1; |
| unsigned w_index; |
| unsigned w_value; |
| |
| w_index = le16_to_cpu(setup->wIndex); |
| w_value = le16_to_cpu(setup->wValue); |
| switch (setup->bRequest) { |
| case USB_REQ_SET_ADDRESS: |
| if (setup->bRequestType != Dev_Request) |
| break; |
| dum->address = w_value; |
| *status = 0; |
| dev_dbg(udc_dev(dum), "set_address = %d\n", |
| w_value); |
| ret_val = 0; |
| break; |
| case USB_REQ_SET_FEATURE: |
| if (setup->bRequestType == Dev_Request) { |
| ret_val = 0; |
| switch (w_value) { |
| case USB_DEVICE_REMOTE_WAKEUP: |
| break; |
| case USB_DEVICE_B_HNP_ENABLE: |
| dum->gadget.b_hnp_enable = 1; |
| break; |
| case USB_DEVICE_A_HNP_SUPPORT: |
| dum->gadget.a_hnp_support = 1; |
| break; |
| case USB_DEVICE_A_ALT_HNP_SUPPORT: |
| dum->gadget.a_alt_hnp_support = 1; |
| break; |
| case USB_DEVICE_U1_ENABLE: |
| if (dummy_hcd_to_hcd(dum_hcd)->speed == |
| HCD_USB3) |
| w_value = USB_DEV_STAT_U1_ENABLED; |
| else |
| ret_val = -EOPNOTSUPP; |
| break; |
| case USB_DEVICE_U2_ENABLE: |
| if (dummy_hcd_to_hcd(dum_hcd)->speed == |
| HCD_USB3) |
| w_value = USB_DEV_STAT_U2_ENABLED; |
| else |
| ret_val = -EOPNOTSUPP; |
| break; |
| case USB_DEVICE_LTM_ENABLE: |
| if (dummy_hcd_to_hcd(dum_hcd)->speed == |
| HCD_USB3) |
| w_value = USB_DEV_STAT_LTM_ENABLED; |
| else |
| ret_val = -EOPNOTSUPP; |
| break; |
| default: |
| ret_val = -EOPNOTSUPP; |
| } |
| if (ret_val == 0) { |
| dum->devstatus |= (1 << w_value); |
| *status = 0; |
| } |
| } else if (setup->bRequestType == Ep_Request) { |
| /* endpoint halt */ |
| ep2 = find_endpoint(dum, w_index); |
| if (!ep2 || ep2->ep.name == ep0name) { |
| ret_val = -EOPNOTSUPP; |
| break; |
| } |
| ep2->halted = 1; |
| ret_val = 0; |
| *status = 0; |
| } |
| break; |
| case USB_REQ_CLEAR_FEATURE: |
| if (setup->bRequestType == Dev_Request) { |
| ret_val = 0; |
| switch (w_value) { |
| case USB_DEVICE_REMOTE_WAKEUP: |
| w_value = USB_DEVICE_REMOTE_WAKEUP; |
| break; |
| case USB_DEVICE_U1_ENABLE: |
| if (dummy_hcd_to_hcd(dum_hcd)->speed == |
| HCD_USB3) |
| w_value = USB_DEV_STAT_U1_ENABLED; |
| else |
| ret_val = -EOPNOTSUPP; |
| break; |
| case USB_DEVICE_U2_ENABLE: |
| if (dummy_hcd_to_hcd(dum_hcd)->speed == |
| HCD_USB3) |
| w_value = USB_DEV_STAT_U2_ENABLED; |
| else |
| ret_val = -EOPNOTSUPP; |
| break; |
| case USB_DEVICE_LTM_ENABLE: |
| if (dummy_hcd_to_hcd(dum_hcd)->speed == |
| HCD_USB3) |
| w_value = USB_DEV_STAT_LTM_ENABLED; |
| else |
| ret_val = -EOPNOTSUPP; |
| break; |
| default: |
| ret_val = -EOPNOTSUPP; |
| break; |
| } |
| if (ret_val == 0) { |
| dum->devstatus &= ~(1 << w_value); |
| *status = 0; |
| } |
| } else if (setup->bRequestType == Ep_Request) { |
| /* endpoint halt */ |
| ep2 = find_endpoint(dum, w_index); |
| if (!ep2) { |
| ret_val = -EOPNOTSUPP; |
| break; |
| } |
| if (!ep2->wedged) |
| ep2->halted = 0; |
| ret_val = 0; |
| *status = 0; |
| } |
| break; |
| case USB_REQ_GET_STATUS: |
| if (setup->bRequestType == Dev_InRequest |
| || setup->bRequestType == Intf_InRequest |
| || setup->bRequestType == Ep_InRequest) { |
| char *buf; |
| /* |
| * device: remote wakeup, selfpowered |
| * interface: nothing |
| * endpoint: halt |
| */ |
| buf = (char *)urb->transfer_buffer; |
| if (urb->transfer_buffer_length > 0) { |
| if (setup->bRequestType == Ep_InRequest) { |
| ep2 = find_endpoint(dum, w_index); |
| if (!ep2) { |
| ret_val = -EOPNOTSUPP; |
| break; |
| } |
| buf[0] = ep2->halted; |
| } else if (setup->bRequestType == |
| Dev_InRequest) { |
| buf[0] = (u8)dum->devstatus; |
| } else |
| buf[0] = 0; |
| } |
| if (urb->transfer_buffer_length > 1) |
| buf[1] = 0; |
| urb->actual_length = min_t(u32, 2, |
| urb->transfer_buffer_length); |
| ret_val = 0; |
| *status = 0; |
| } |
| break; |
| } |
| return ret_val; |
| } |
| |
| /* drive both sides of the transfers; looks like irq handlers to |
| * both drivers except the callbacks aren't in_irq(). |
| */ |
| static void dummy_timer(unsigned long _dum_hcd) |
| { |
| struct dummy_hcd *dum_hcd = (struct dummy_hcd *) _dum_hcd; |
| struct dummy *dum = dum_hcd->dum; |
| struct urbp *urbp, *tmp; |
| unsigned long flags; |
| int limit, total; |
| int i; |
| |
| /* simplistic model for one frame's bandwidth */ |
| switch (dum->gadget.speed) { |
| case USB_SPEED_LOW: |
| total = 8/*bytes*/ * 12/*packets*/; |
| break; |
| case USB_SPEED_FULL: |
| total = 64/*bytes*/ * 19/*packets*/; |
| break; |
| case USB_SPEED_HIGH: |
| total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/; |
| break; |
| case USB_SPEED_SUPER: |
| /* Bus speed is 500000 bytes/ms, so use a little less */ |
| total = 490000; |
| break; |
| default: |
| dev_err(dummy_dev(dum_hcd), "bogus device speed\n"); |
| return; |
| } |
| |
| /* FIXME if HZ != 1000 this will probably misbehave ... */ |
| |
| /* look at each urb queued by the host side driver */ |
| spin_lock_irqsave(&dum->lock, flags); |
| |
| if (!dum_hcd->udev) { |
| dev_err(dummy_dev(dum_hcd), |
| "timer fired with no URBs pending?\n"); |
| spin_unlock_irqrestore(&dum->lock, flags); |
| return; |
| } |
| |
| for (i = 0; i < DUMMY_ENDPOINTS; i++) { |
| if (!ep_name[i]) |
| break; |
| dum->ep[i].already_seen = 0; |
| } |
| |
| restart: |
| list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) { |
| struct urb *urb; |
| struct dummy_request *req; |
| u8 address; |
| struct dummy_ep *ep = NULL; |
| int type; |
| int status = -EINPROGRESS; |
| |
| urb = urbp->urb; |
| if (urb->unlinked) |
| goto return_urb; |
| else if (dum_hcd->rh_state != DUMMY_RH_RUNNING) |
| continue; |
| type = usb_pipetype(urb->pipe); |
| |
| /* used up this frame's non-periodic bandwidth? |
| * FIXME there's infinite bandwidth for control and |
| * periodic transfers ... unrealistic. |
| */ |
| if (total <= 0 && type == PIPE_BULK) |
| continue; |
| |
| /* find the gadget's ep for this request (if configured) */ |
| address = usb_pipeendpoint (urb->pipe); |
| if (usb_pipein(urb->pipe)) |
| address |= USB_DIR_IN; |
| ep = find_endpoint(dum, address); |
| if (!ep) { |
| /* set_configuration() disagreement */ |
| dev_dbg(dummy_dev(dum_hcd), |
| "no ep configured for urb %p\n", |
| urb); |
| status = -EPROTO; |
| goto return_urb; |
| } |
| |
| if (ep->already_seen) |
| continue; |
| ep->already_seen = 1; |
| if (ep == &dum->ep[0] && urb->error_count) { |
| ep->setup_stage = 1; /* a new urb */ |
| urb->error_count = 0; |
| } |
| if (ep->halted && !ep->setup_stage) { |
| /* NOTE: must not be iso! */ |
| dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n", |
| ep->ep.name, urb); |
| status = -EPIPE; |
| goto return_urb; |
| } |
| /* FIXME make sure both ends agree on maxpacket */ |
| |
| /* handle control requests */ |
| if (ep == &dum->ep[0] && ep->setup_stage) { |
| struct usb_ctrlrequest setup; |
| int value = 1; |
| |
| setup = *(struct usb_ctrlrequest *) urb->setup_packet; |
| /* paranoia, in case of stale queued data */ |
| list_for_each_entry(req, &ep->queue, queue) { |
| list_del_init(&req->queue); |
| req->req.status = -EOVERFLOW; |
| dev_dbg(udc_dev(dum), "stale req = %p\n", |
| req); |
| |
| spin_unlock(&dum->lock); |
| 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 */ |
| |
| 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 */ |
| 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 = 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 DeviceRequest | USB_REQ_GET_DESCRIPTOR: |
| if (hcd->speed != HCD_USB3) |
| goto error; |
| |
| if ((wValue >> 8) != USB_DT_BOS) |
| goto error; |
| |
| memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc)); |
| retval = sizeof(usb3_bos_desc); |
| break; |
| |
| case GetHubStatus: |
| *(__le32 *) buf = cpu_to_le32(0); |
| break; |
| case GetPortStatus: |
| if (wIndex != 1) |
| retval = -EPIPE; |
| |
| /* whoever resets or resumes must GetPortStatus to |
| * complete it!! |
| */ |
| if (dum_hcd->resuming && |
| time_after_eq(jiffies, dum_hcd->re_timeout)) { |
| dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16); |
| dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; |
| } |
| if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 && |
| time_after_eq(jiffies, dum_hcd->re_timeout)) { |
| dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16); |
| dum_hcd->port_status &= ~USB_PORT_STAT_RESET; |
| if (dum_hcd->dum->pullup) { |
| dum_hcd->port_status |= USB_PORT_STAT_ENABLE; |
| |
| if (hcd->speed < HCD_USB3) { |
| switch (dum_hcd->dum->gadget.speed) { |
| case USB_SPEED_HIGH: |
| dum_hcd->port_status |= |
| USB_PORT_STAT_HIGH_SPEED; |
| break; |
| case USB_SPEED_LOW: |
| dum_hcd->dum->gadget.ep0-> |
| maxpacket = 8; |
| dum_hcd->port_status |= |
| USB_PORT_STAT_LOW_SPEED; |
| break; |
| default: |
| dum_hcd->dum->gadget.speed = |
| USB_SPEED_FULL; |
| break; |
| } |
| } |
| } |
| } |
| set_link_state(dum_hcd); |
| ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status); |
| ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16); |
| break; |
| case SetHubFeature: |
| retval = -EPIPE; |
| break; |
| case SetPortFeature: |
| switch (wValue) { |
| case USB_PORT_FEAT_LINK_STATE: |
| if (hcd->speed != HCD_USB3) { |
| dev_dbg(dummy_dev(dum_hcd), |
| "USB_PORT_FEAT_LINK_STATE req not " |
| "supported for USB 2.0 roothub\n"); |
| goto error; |
| } |
| /* |
| * Since this is dummy we don't have an actual link so |
| * there is nothing to do for the SET_LINK_STATE cmd |
| */ |
| break; |
| case USB_PORT_FEAT_U1_TIMEOUT: |
| case USB_PORT_FEAT_U2_TIMEOUT: |
| /* TODO: add suspend/resume support! */ |
| if (hcd->speed != HCD_USB3) { |
| dev_dbg(dummy_dev(dum_hcd), |
| "USB_PORT_FEAT_U1/2_TIMEOUT req not " |
| "supported for USB 2.0 roothub\n"); |
| goto error; |
| } |
| break; |
| case USB_PORT_FEAT_SUSPEND: |
| /* Applicable only for USB2.0 hub */ |
| if (hcd->speed == HCD_USB3) { |
| dev_dbg(dummy_dev(dum_hcd), |
| "USB_PORT_FEAT_SUSPEND req not " |
| "supported for USB 3.0 roothub\n"); |
| goto error; |
| } |
| if (dum_hcd->active) { |
| dum_hcd->port_status |= USB_PORT_STAT_SUSPEND; |
| |
| /* HNP would happen here; for now we |
| * assume b_bus_req is always true. |
| */ |
| set_link_state(dum_hcd); |
| if (((1 << USB_DEVICE_B_HNP_ENABLE) |
| & dum_hcd->dum->devstatus) != 0) |
| dev_dbg(dummy_dev(dum_hcd), |
| "no HNP yet!\n"); |
| } |
| break; |
| case USB_PORT_FEAT_POWER: |
| if (hcd->speed == HCD_USB3) |
| dum_hcd->port_status |= USB_SS_PORT_STAT_POWER; |
| else |
| dum_hcd->port_status |= USB_PORT_STAT_POWER; |
| set_link_state(dum_hcd); |
| break; |
| case USB_PORT_FEAT_BH_PORT_RESET: |
| /* Applicable only for USB3.0 hub */ |
| if (hcd->speed != HCD_USB3) { |
| dev_dbg(dummy_dev(dum_hcd), |
| "USB_PORT_FEAT_BH_PORT_RESET req not " |
| "supported for USB 2.0 roothub\n"); |
| goto error; |
| } |
| /* FALLS THROUGH */ |
| case USB_PORT_FEAT_RESET: |
| /* if it's already enabled, disable */ |
| if (hcd->speed == HCD_USB3) { |
| dum_hcd->port_status = 0; |
| dum_hcd->port_status = |
| (USB_SS_PORT_STAT_POWER | |
| USB_PORT_STAT_CONNECTION | |
| USB_PORT_STAT_RESET); |
| } else |
| dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE |
| | USB_PORT_STAT_LOW_SPEED |
| | USB_PORT_STAT_HIGH_SPEED); |
| /* |
| * We want to reset device status. All but the |
| * Self powered feature |
| */ |
| dum_hcd->dum->devstatus &= |
| (1 << USB_DEVICE_SELF_POWERED); |
| /* |
| * FIXME USB3.0: what is the correct reset signaling |
| * interval? Is it still 50msec as for HS? |
| */ |
| dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50); |
| /* FALLS THROUGH */ |
| default: |
| if (hcd->speed == HCD_USB3) { |
| if ((dum_hcd->port_status & |
| USB_SS_PORT_STAT_POWER) != 0) { |
| dum_hcd->port_status |= (1 << wValue); |
| set_link_state(dum_hcd); |
| } |
| } else |
| if ((dum_hcd->port_status & |
| USB_PORT_STAT_POWER) != 0) { |
| dum_hcd->port_status |= (1 << wValue); |
| set_link_state(dum_hcd); |
| } |
| } |
| break; |
| case GetPortErrorCount: |
| if (hcd->speed != HCD_USB3) { |
| dev_dbg(dummy_dev(dum_hcd), |
| "GetPortErrorCount req not " |
| "supported for USB 2.0 roothub\n"); |
| goto error; |
| } |
| /* We'll always return 0 since this is a dummy hub */ |
| *(__le32 *) buf = cpu_to_le32(0); |
| break; |
| case SetHubDepth: |
| if (hcd->speed != HCD_USB3) { |
| dev_dbg(dummy_dev(dum_hcd), |
| "SetHubDepth req not supported for " |
| "USB 2.0 roothub\n"); |
| goto error; |
| } |
| break; |
| default: |
| dev_dbg(dummy_dev(dum_hcd), |
| "hub control req%04x v%04x i%04x l%d\n", |
| typeReq, wValue, wIndex, wLength); |
| error: |
| /* "protocol stall" on error */ |
| retval = -EPIPE; |
| } |
| spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); |
| |
| if ((dum_hcd->port_status & PORT_C_MASK) != 0) |
| usb_hcd_poll_rh_status(hcd); |
| return retval; |
| } |
| |
| static int dummy_bus_suspend(struct usb_hcd *hcd) |
| { |
| struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); |
| |
| dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); |
| |
| spin_lock_irq(&dum_hcd->dum->lock); |
| dum_hcd->rh_state = DUMMY_RH_SUSPENDED; |
| set_link_state(dum_hcd); |
| hcd->state = HC_STATE_SUSPENDED; |
| spin_unlock_irq(&dum_hcd->dum->lock); |
| return 0; |
| } |
| |
| static int dummy_bus_resume(struct usb_hcd *hcd) |
| { |
| struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); |
| int rc = 0; |
| |
| dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); |
| |
| spin_lock_irq(&dum_hcd->dum->lock); |
| if (!HCD_HW_ACCESSIBLE(hcd)) { |
| rc = -ESHUTDOWN; |
| } else { |
| dum_hcd->rh_state = DUMMY_RH_RUNNING; |
| set_link_state(dum_hcd); |
| if (!list_empty(&dum_hcd->urbp_list)) |
| mod_timer(&dum_hcd->timer, jiffies); |
| hcd->state = HC_STATE_RUNNING; |
| } |
| spin_unlock_irq(&dum_hcd->dum->lock); |
| return rc; |
| } |
| |
| /*-------------------------------------------------------------------------*/ |
| |
| static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb) |
| { |
| int ep = usb_pipeendpoint(urb->pipe); |
| |
| return snprintf(buf, size, |
| "urb/%p %s ep%d%s%s len %d/%d\n", |
| urb, |
| ({ char *s; |
| switch (urb->dev->speed) { |
| case USB_SPEED_LOW: |
| s = "ls"; |
| break; |
| case USB_SPEED_FULL: |
| s = "fs"; |
| break; |
| case USB_SPEED_HIGH: |
| s = "hs"; |
| break; |
| case USB_SPEED_SUPER: |
| s = "ss"; |
| break; |
| default: |
| s = "?"; |
| break; |
| }; s; }), |
| ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "", |
| ({ char *s; \ |
| switch (usb_pipetype(urb->pipe)) { \ |
| case PIPE_CONTROL: \ |
| s = ""; \ |
| break; \ |
| case PIPE_BULK: \ |
| s = "-bulk"; \ |
| break; \ |
| case PIPE_INTERRUPT: \ |
| s = "-int"; \ |
| break; \ |
| default: \ |
| s = "-iso"; \ |
| break; \ |
| }; s; }), |
| urb->actual_length, urb->transfer_buffer_length); |
| } |
| |
| static ssize_t 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; |
| dum_hcd->stream_en_ep = 0; |
| INIT_LIST_HEAD(&dum_hcd->urbp_list); |
| dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET; |
| dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING; |
| dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1; |
| #ifdef CONFIG_USB_OTG |
| dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1; |
| #endif |
| return 0; |
| |
| /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ |
| return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); |
| } |
| |
| static int dummy_start(struct usb_hcd *hcd) |
| { |
| struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); |
| |
| /* |
| * MASTER side init ... we emulate a root hub that'll only ever |
| * talk to one device (the slave side). Also appears in sysfs, |
| * just like more familiar pci-based HCDs. |
| */ |
| if (!usb_hcd_is_primary_hcd(hcd)) |
| return dummy_start_ss(dum_hcd); |
| |
| spin_lock_init(&dum_hcd->dum->lock); |
| init_timer(&dum_hcd->timer); |
| dum_hcd->timer.function = dummy_timer; |
| dum_hcd->timer.data = (unsigned long)dum_hcd; |
| dum_hcd->rh_state = DUMMY_RH_RUNNING; |
| |
| INIT_LIST_HEAD(&dum_hcd->urbp_list); |
| |
| hcd->power_budget = POWER_BUDGET; |
| hcd->state = HC_STATE_RUNNING; |
| hcd->uses_new_polling = 1; |
| |
| #ifdef CONFIG_USB_OTG |
| hcd->self.otg_port = 1; |
| #endif |
| |
| /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ |
| return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); |
| } |
| |
| static void dummy_stop(struct usb_hcd *hcd) |
| { |
| struct dummy *dum; |
| |
| dum = hcd_to_dummy_hcd(hcd)->dum; |
| device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs); |
| 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) |
| { |
| hcd->self.sg_tablesize = ~0; |
| 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 */ |
| static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev, |
| struct usb_host_endpoint **eps, unsigned int num_eps, |
| unsigned int num_streams, gfp_t mem_flags) |
| { |
| struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); |
| unsigned long flags; |
| int max_stream; |
| int ret_streams = num_streams; |
| unsigned int index; |
| unsigned int i; |
| |
| if (!num_eps) |
| return -EINVAL; |
| |
| spin_lock_irqsave(&dum_hcd->dum->lock, flags); |
| for (i = 0; i < num_eps; i++) { |
| index = dummy_get_ep_idx(&eps[i]->desc); |
| if ((1 << index) & dum_hcd->stream_en_ep) { |
| ret_streams = -EINVAL; |
| goto out; |
| } |
| max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp); |
| if (!max_stream) { |
| ret_streams = -EINVAL; |
| goto out; |
| } |
| if (max_stream < ret_streams) { |
| dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u " |
| "stream IDs.\n", |
| eps[i]->desc.bEndpointAddress, |
| max_stream); |
| ret_streams = max_stream; |
| } |
| } |
| |
| for (i = 0; i < num_eps; i++) { |
| index = dummy_get_ep_idx(&eps[i]->desc); |
| dum_hcd->stream_en_ep |= 1 << index; |
| set_max_streams_for_pipe(dum_hcd, |
| usb_endpoint_num(&eps[i]->desc), ret_streams); |
| } |
| out: |
| spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); |
| return ret_streams; |
| } |
| |
| /* Reverts a group of bulk endpoints back to not using stream IDs. */ |
| static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev, |
| struct usb_host_endpoint **eps, unsigned int num_eps, |
| gfp_t mem_flags) |
| { |
| struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); |
| unsigned long flags; |
| int ret; |
| unsigned int index; |
| unsigned int i; |
| |
| spin_lock_irqsave(&dum_hcd->dum->lock, flags); |
| for (i = 0; i < num_eps; i++) { |
| index = dummy_get_ep_idx(&eps[i]->desc); |
| if (!((1 << index) & dum_hcd->stream_en_ep)) { |
| ret = -EINVAL; |
| goto out; |
| } |
| } |
| |
| for (i = 0; i < num_eps; i++) { |
| index = dummy_get_ep_idx(&eps[i]->desc); |
| dum_hcd->stream_en_ep &= ~(1 << index); |
| set_max_streams_for_pipe(dum_hcd, |
| usb_endpoint_num(&eps[i]->desc), 0); |
| } |
| ret = 0; |
| out: |
| spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); |
| return ret; |
| } |
| |
| static struct hc_driver dummy_hcd = { |
| .description = (char *) driver_name, |
| .product_desc = "Dummy host controller", |
| .hcd_priv_size = sizeof(struct dummy_hcd), |
| |
| .flags = HCD_USB3 | HCD_SHARED, |
| |
| .reset = dummy_setup, |
| .start = dummy_start, |
| .stop = dummy_stop, |
| |
| .urb_enqueue = dummy_urb_enqueue, |
| .urb_dequeue = dummy_urb_dequeue, |
| |
| .get_frame_number = dummy_h_get_frame, |
| |
| .hub_status_data = dummy_hub_status, |
| .hub_control = dummy_hub_control, |
| .bus_suspend = dummy_bus_suspend, |
| .bus_resume = dummy_bus_resume, |
| |
| .alloc_streams = dummy_alloc_streams, |
| .free_streams = dummy_free_streams, |
| }; |
| |
| static int dummy_hcd_probe(struct platform_device *pdev) |
| { |
| struct 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) |
| 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); |
| 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, |
| }, |
| }; |
| |
| /*-------------------------------------------------------------------------*/ |
| #define MAX_NUM_UDC 1 |
| static struct platform_device *the_udc_pdev[MAX_NUM_UDC]; |
| static struct platform_device *the_hcd_pdev[MAX_NUM_UDC]; |
| |
| static int __init init(void) |
| { |
| int retval = -ENOMEM; |
| |
| if (usb_disabled()) |
| return -ENODEV; |
| |
| if (!mod_data.is_high_speed && mod_data.is_super_speed) |
| return -EINVAL; |
| |
| the_hcd_pdev[0] = platform_device_alloc(driver_name, 0); |
| if (!the_hcd_pdev[0]) |
| return retval; |
| the_udc_pdev[0] = platform_device_alloc(gadget_name, 0); |
| if (!the_udc_pdev[0]) |
| 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[0]); |
| 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[0]); |
| if (retval < 0) |
| goto err_add_udc; |
| if (!platform_get_drvdata(the_udc_pdev[0])) { |
| /* |
| * 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[0]); |
| err_add_udc: |
| platform_device_del(the_hcd_pdev[0]); |
| 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[0]); |
| err_alloc_udc: |
| platform_device_put(the_hcd_pdev[0]); |
| return retval; |
| } |
| module_init(init); |
| |
| static void __exit cleanup(void) |
| { |
| platform_device_unregister(the_udc_pdev[0]); |
| platform_device_unregister(the_hcd_pdev[0]); |
| platform_driver_unregister(&dummy_udc_driver); |
| platform_driver_unregister(&dummy_hcd_driver); |
| } |
| module_exit(cleanup); |