2 * dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver.
4 * Maintainer: Alan Stern <stern@rowland.harvard.edu>
6 * Copyright (C) 2003 David Brownell
7 * Copyright (C) 2003-2005 Alan Stern
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 * This exposes a device side "USB gadget" API, driven by requests to a
27 * Linux-USB host controller driver. USB traffic is simulated; there's
28 * no need for USB hardware. Use this with two other drivers:
30 * - Gadget driver, responding to requests (slave);
31 * - Host-side device driver, as already familiar in Linux.
33 * Having this all in one kernel can help some stages of development,
34 * bypassing some hardware (and driver) issues. UML could help too.
37 #include <linux/module.h>
38 #include <linux/kernel.h>
39 #include <linux/delay.h>
40 #include <linux/ioport.h>
41 #include <linux/slab.h>
42 #include <linux/errno.h>
43 #include <linux/init.h>
44 #include <linux/timer.h>
45 #include <linux/list.h>
46 #include <linux/interrupt.h>
47 #include <linux/platform_device.h>
48 #include <linux/usb.h>
49 #include <linux/usb/gadget.h>
50 #include <linux/usb/hcd.h>
52 #include <asm/byteorder.h>
55 #include <asm/system.h>
56 #include <asm/unaligned.h>
59 #define DRIVER_DESC "USB Host+Gadget Emulator"
60 #define DRIVER_VERSION "02 May 2005"
62 #define POWER_BUDGET 500 /* in mA; use 8 for low-power port testing */
64 static const char driver_name [] = "dummy_hcd";
65 static const char driver_desc [] = "USB Host+Gadget Emulator";
67 static const char gadget_name [] = "dummy_udc";
69 MODULE_DESCRIPTION (DRIVER_DESC);
70 MODULE_AUTHOR ("David Brownell");
71 MODULE_LICENSE ("GPL");
73 /*-------------------------------------------------------------------------*/
75 /* gadget side driver data structres */
77 struct list_head queue;
78 unsigned long last_io; /* jiffies timestamp */
79 struct usb_gadget *gadget;
80 const struct usb_endpoint_descriptor *desc;
84 unsigned already_seen : 1;
85 unsigned setup_stage : 1;
88 struct dummy_request {
89 struct list_head queue; /* ep's requests */
90 struct usb_request req;
93 static inline struct dummy_ep *usb_ep_to_dummy_ep (struct usb_ep *_ep)
95 return container_of (_ep, struct dummy_ep, ep);
98 static inline struct dummy_request *usb_request_to_dummy_request
99 (struct usb_request *_req)
101 return container_of (_req, struct dummy_request, req);
104 /*-------------------------------------------------------------------------*/
107 * Every device has ep0 for control requests, plus up to 30 more endpoints,
108 * in one of two types:
110 * - Configurable: direction (in/out), type (bulk, iso, etc), and endpoint
111 * number can be changed. Names like "ep-a" are used for this type.
113 * - Fixed Function: in other cases. some characteristics may be mutable;
114 * that'd be hardware-specific. Names like "ep12out-bulk" are used.
116 * Gadget drivers are responsible for not setting up conflicting endpoint
117 * configurations, illegal or unsupported packet lengths, and so on.
120 static const char ep0name [] = "ep0";
122 static const char *const ep_name [] = {
123 ep0name, /* everyone has ep0 */
125 /* act like a net2280: high speed, six configurable endpoints */
126 "ep-a", "ep-b", "ep-c", "ep-d", "ep-e", "ep-f",
128 /* or like pxa250: fifteen fixed function endpoints */
129 "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
130 "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
131 "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
134 /* or like sa1100: two fixed function endpoints */
135 "ep1out-bulk", "ep2in-bulk",
137 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_name)
139 /*-------------------------------------------------------------------------*/
145 struct list_head urbp_list;
149 enum dummy_rh_state {
159 * SLAVE/GADGET side support
161 struct dummy_ep ep [DUMMY_ENDPOINTS];
163 struct usb_gadget gadget;
164 struct usb_gadget_driver *driver;
165 struct dummy_request fifo_req;
166 u8 fifo_buf [FIFO_SIZE];
168 unsigned udc_suspended:1;
171 unsigned old_active:1;
174 * MASTER/HOST side support
176 enum dummy_rh_state rh_state;
177 struct timer_list timer;
181 unsigned long re_timeout;
183 struct usb_device *udev;
184 struct list_head urbp_list;
187 static inline struct dummy *hcd_to_dummy (struct usb_hcd *hcd)
189 return (struct dummy *) (hcd->hcd_priv);
192 static inline struct usb_hcd *dummy_to_hcd (struct dummy *dum)
194 return container_of((void *) dum, struct usb_hcd, hcd_priv);
197 static inline struct device *dummy_dev (struct dummy *dum)
199 return dummy_to_hcd(dum)->self.controller;
202 static inline struct device *udc_dev (struct dummy *dum)
204 return dum->gadget.dev.parent;
207 static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
209 return container_of (ep->gadget, struct dummy, gadget);
212 static inline struct dummy *gadget_to_dummy (struct usb_gadget *gadget)
214 return container_of (gadget, struct dummy, gadget);
217 static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
219 return container_of (dev, struct dummy, gadget.dev);
222 static struct dummy *the_controller;
224 /*-------------------------------------------------------------------------*/
226 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
228 /* called with spinlock held */
229 static void nuke (struct dummy *dum, struct dummy_ep *ep)
231 while (!list_empty (&ep->queue)) {
232 struct dummy_request *req;
234 req = list_entry (ep->queue.next, struct dummy_request, queue);
235 list_del_init (&req->queue);
236 req->req.status = -ESHUTDOWN;
238 spin_unlock (&dum->lock);
239 req->req.complete (&ep->ep, &req->req);
240 spin_lock (&dum->lock);
244 /* caller must hold lock */
246 stop_activity (struct dummy *dum)
250 /* prevent any more requests */
253 /* The timer is left running so that outstanding URBs can fail */
255 /* nuke any pending requests first, so driver i/o is quiesced */
256 list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
259 /* driver now does any non-usb quiescing necessary */
262 /* caller must hold lock */
264 set_link_state (struct dummy *dum)
267 if ((dum->port_status & USB_PORT_STAT_POWER) == 0)
268 dum->port_status = 0;
270 /* UDC suspend must cause a disconnect */
271 else if (!dum->pullup || dum->udc_suspended) {
272 dum->port_status &= ~(USB_PORT_STAT_CONNECTION |
273 USB_PORT_STAT_ENABLE |
274 USB_PORT_STAT_LOW_SPEED |
275 USB_PORT_STAT_HIGH_SPEED |
276 USB_PORT_STAT_SUSPEND);
277 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0)
278 dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
280 dum->port_status |= USB_PORT_STAT_CONNECTION;
281 if ((dum->old_status & USB_PORT_STAT_CONNECTION) == 0)
282 dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
283 if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0)
284 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
285 else if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
286 dum->rh_state != DUMMY_RH_SUSPENDED)
290 if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0 || dum->active)
293 if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
294 (dum->port_status & USB_PORT_STAT_RESET) != 0) {
295 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0 &&
296 (dum->old_status & USB_PORT_STAT_RESET) == 0 &&
299 spin_unlock (&dum->lock);
300 dum->driver->disconnect (&dum->gadget);
301 spin_lock (&dum->lock);
303 } else if (dum->active != dum->old_active) {
304 if (dum->old_active && dum->driver->suspend) {
305 spin_unlock (&dum->lock);
306 dum->driver->suspend (&dum->gadget);
307 spin_lock (&dum->lock);
308 } else if (!dum->old_active && dum->driver->resume) {
309 spin_unlock (&dum->lock);
310 dum->driver->resume (&dum->gadget);
311 spin_lock (&dum->lock);
315 dum->old_status = dum->port_status;
316 dum->old_active = dum->active;
319 /*-------------------------------------------------------------------------*/
321 /* SLAVE/GADGET SIDE DRIVER
323 * This only tracks gadget state. All the work is done when the host
324 * side tries some (emulated) i/o operation. Real device controller
325 * drivers would do real i/o using dma, fifos, irqs, timers, etc.
328 #define is_enabled(dum) \
329 (dum->port_status & USB_PORT_STAT_ENABLE)
332 dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
339 ep = usb_ep_to_dummy_ep (_ep);
340 if (!_ep || !desc || ep->desc || _ep->name == ep0name
341 || desc->bDescriptorType != USB_DT_ENDPOINT)
343 dum = ep_to_dummy (ep);
344 if (!dum->driver || !is_enabled (dum))
346 max = le16_to_cpu(desc->wMaxPacketSize) & 0x3ff;
348 /* drivers must not request bad settings, since lower levels
349 * (hardware or its drivers) may not check. some endpoints
350 * can't do iso, many have maxpacket limitations, etc.
352 * since this "hardware" driver is here to help debugging, we
353 * have some extra sanity checks. (there could be more though,
354 * especially for "ep9out" style fixed function ones.)
357 switch (desc->bmAttributes & 0x03) {
358 case USB_ENDPOINT_XFER_BULK:
359 if (strstr (ep->ep.name, "-iso")
360 || strstr (ep->ep.name, "-int")) {
363 switch (dum->gadget.speed) {
369 if (max == 8 || max == 16 || max == 32 || max == 64)
370 /* we'll fake any legal size */
372 /* save a return statement */
377 case USB_ENDPOINT_XFER_INT:
378 if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
380 /* real hardware might not handle all packet sizes */
381 switch (dum->gadget.speed) {
385 /* save a return statement */
389 /* save a return statement */
396 case USB_ENDPOINT_XFER_ISOC:
397 if (strstr (ep->ep.name, "-bulk")
398 || strstr (ep->ep.name, "-int"))
400 /* real hardware might not handle all packet sizes */
401 switch (dum->gadget.speed) {
405 /* save a return statement */
409 /* save a return statement */
415 /* few chips support control except on ep0 */
419 _ep->maxpacket = max;
422 dev_dbg (udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
424 desc->bEndpointAddress & 0x0f,
425 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
427 switch (desc->bmAttributes & 0x03) {
428 case USB_ENDPOINT_XFER_BULK: val = "bulk"; break;
429 case USB_ENDPOINT_XFER_ISOC: val = "iso"; break;
430 case USB_ENDPOINT_XFER_INT: val = "intr"; break;
431 default: val = "ctrl"; break;
435 /* at this point real hardware should be NAKing transfers
436 * to that endpoint, until a buffer is queued to it.
438 ep->halted = ep->wedged = 0;
444 static int dummy_disable (struct usb_ep *_ep)
451 ep = usb_ep_to_dummy_ep (_ep);
452 if (!_ep || !ep->desc || _ep->name == ep0name)
454 dum = ep_to_dummy (ep);
456 spin_lock_irqsave (&dum->lock, flags);
460 spin_unlock_irqrestore (&dum->lock, flags);
462 dev_dbg (udc_dev(dum), "disabled %s\n", _ep->name);
466 static struct usb_request *
467 dummy_alloc_request (struct usb_ep *_ep, gfp_t mem_flags)
470 struct dummy_request *req;
474 ep = usb_ep_to_dummy_ep (_ep);
476 req = kzalloc(sizeof(*req), mem_flags);
479 INIT_LIST_HEAD (&req->queue);
484 dummy_free_request (struct usb_ep *_ep, struct usb_request *_req)
487 struct dummy_request *req;
489 ep = usb_ep_to_dummy_ep (_ep);
490 if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
493 req = usb_request_to_dummy_request (_req);
494 WARN_ON (!list_empty (&req->queue));
499 fifo_complete (struct usb_ep *ep, struct usb_request *req)
504 dummy_queue (struct usb_ep *_ep, struct usb_request *_req,
508 struct dummy_request *req;
512 req = usb_request_to_dummy_request (_req);
513 if (!_req || !list_empty (&req->queue) || !_req->complete)
516 ep = usb_ep_to_dummy_ep (_ep);
517 if (!_ep || (!ep->desc && _ep->name != ep0name))
520 dum = ep_to_dummy (ep);
521 if (!dum->driver || !is_enabled (dum))
525 dev_dbg (udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
526 ep, _req, _ep->name, _req->length, _req->buf);
529 _req->status = -EINPROGRESS;
531 spin_lock_irqsave (&dum->lock, flags);
533 /* implement an emulated single-request FIFO */
534 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
535 list_empty (&dum->fifo_req.queue) &&
536 list_empty (&ep->queue) &&
537 _req->length <= FIFO_SIZE) {
538 req = &dum->fifo_req;
540 req->req.buf = dum->fifo_buf;
541 memcpy (dum->fifo_buf, _req->buf, _req->length);
542 req->req.context = dum;
543 req->req.complete = fifo_complete;
545 list_add_tail(&req->queue, &ep->queue);
546 spin_unlock (&dum->lock);
547 _req->actual = _req->length;
549 _req->complete (_ep, _req);
550 spin_lock (&dum->lock);
552 list_add_tail(&req->queue, &ep->queue);
553 spin_unlock_irqrestore (&dum->lock, flags);
555 /* real hardware would likely enable transfers here, in case
556 * it'd been left NAKing.
561 static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
565 int retval = -EINVAL;
567 struct dummy_request *req = NULL;
571 ep = usb_ep_to_dummy_ep (_ep);
572 dum = ep_to_dummy (ep);
577 local_irq_save (flags);
578 spin_lock (&dum->lock);
579 list_for_each_entry (req, &ep->queue, queue) {
580 if (&req->req == _req) {
581 list_del_init (&req->queue);
582 _req->status = -ECONNRESET;
587 spin_unlock (&dum->lock);
590 dev_dbg (udc_dev(dum),
591 "dequeued req %p from %s, len %d buf %p\n",
592 req, _ep->name, _req->length, _req->buf);
593 _req->complete (_ep, _req);
595 local_irq_restore (flags);
600 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
607 ep = usb_ep_to_dummy_ep (_ep);
608 dum = ep_to_dummy (ep);
612 ep->halted = ep->wedged = 0;
613 else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
614 !list_empty (&ep->queue))
621 /* FIXME clear emulated data toggle too */
626 dummy_set_halt(struct usb_ep *_ep, int value)
628 return dummy_set_halt_and_wedge(_ep, value, 0);
631 static int dummy_set_wedge(struct usb_ep *_ep)
633 if (!_ep || _ep->name == ep0name)
635 return dummy_set_halt_and_wedge(_ep, 1, 1);
638 static const struct usb_ep_ops dummy_ep_ops = {
639 .enable = dummy_enable,
640 .disable = dummy_disable,
642 .alloc_request = dummy_alloc_request,
643 .free_request = dummy_free_request,
645 .queue = dummy_queue,
646 .dequeue = dummy_dequeue,
648 .set_halt = dummy_set_halt,
649 .set_wedge = dummy_set_wedge,
652 /*-------------------------------------------------------------------------*/
654 /* there are both host and device side versions of this call ... */
655 static int dummy_g_get_frame (struct usb_gadget *_gadget)
659 do_gettimeofday (&tv);
660 return tv.tv_usec / 1000;
663 static int dummy_wakeup (struct usb_gadget *_gadget)
667 dum = gadget_to_dummy (_gadget);
668 if (!(dum->devstatus & ( (1 << USB_DEVICE_B_HNP_ENABLE)
669 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
671 if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0)
673 if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
674 dum->rh_state != DUMMY_RH_SUSPENDED)
677 /* FIXME: What if the root hub is suspended but the port isn't? */
679 /* hub notices our request, issues downstream resume, etc */
681 dum->re_timeout = jiffies + msecs_to_jiffies(20);
682 mod_timer (&dummy_to_hcd (dum)->rh_timer, dum->re_timeout);
686 static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
690 dum = gadget_to_dummy (_gadget);
692 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
694 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
698 static int dummy_pullup (struct usb_gadget *_gadget, int value)
703 dum = gadget_to_dummy (_gadget);
704 spin_lock_irqsave (&dum->lock, flags);
705 dum->pullup = (value != 0);
706 set_link_state (dum);
707 spin_unlock_irqrestore (&dum->lock, flags);
709 usb_hcd_poll_rh_status (dummy_to_hcd (dum));
713 static const struct usb_gadget_ops dummy_ops = {
714 .get_frame = dummy_g_get_frame,
715 .wakeup = dummy_wakeup,
716 .set_selfpowered = dummy_set_selfpowered,
717 .pullup = dummy_pullup,
720 /*-------------------------------------------------------------------------*/
722 /* "function" sysfs attribute */
724 show_function (struct device *dev, struct device_attribute *attr, char *buf)
726 struct dummy *dum = gadget_dev_to_dummy (dev);
728 if (!dum->driver || !dum->driver->function)
730 return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
732 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
734 /*-------------------------------------------------------------------------*/
737 * Driver registration/unregistration.
739 * This is basically hardware-specific; there's usually only one real USB
740 * device (not host) controller since that's how USB devices are intended
741 * to work. So most implementations of these api calls will rely on the
742 * fact that only one driver will ever bind to the hardware. But curious
743 * hardware can be built with discrete components, so the gadget API doesn't
744 * require that assumption.
746 * For this emulator, it might be convenient to create a usb slave device
747 * for each driver that registers: just add to a big root hub.
751 usb_gadget_probe_driver(struct usb_gadget_driver *driver,
752 int (*bind)(struct usb_gadget *))
754 struct dummy *dum = the_controller;
761 if (!bind || !driver->setup || driver->speed == USB_SPEED_UNKNOWN)
765 * SLAVE side init ... the layer above hardware, which
766 * can't enumerate without help from the driver we're binding.
771 INIT_LIST_HEAD (&dum->gadget.ep_list);
772 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
773 struct dummy_ep *ep = &dum->ep [i];
777 ep->ep.name = ep_name [i];
778 ep->ep.ops = &dummy_ep_ops;
779 list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list);
780 ep->halted = ep->wedged = ep->already_seen =
782 ep->ep.maxpacket = ~0;
783 ep->last_io = jiffies;
784 ep->gadget = &dum->gadget;
786 INIT_LIST_HEAD (&ep->queue);
789 dum->gadget.ep0 = &dum->ep [0].ep;
790 dum->ep [0].ep.maxpacket = 64;
791 list_del_init (&dum->ep [0].ep.ep_list);
792 INIT_LIST_HEAD(&dum->fifo_req.queue);
794 driver->driver.bus = NULL;
795 dum->driver = driver;
796 dum->gadget.dev.driver = &driver->driver;
797 dev_dbg (udc_dev(dum), "binding gadget driver '%s'\n",
798 driver->driver.name);
799 retval = bind(&dum->gadget);
802 dum->gadget.dev.driver = NULL;
806 /* khubd will enumerate this in a while */
807 spin_lock_irq (&dum->lock);
809 set_link_state (dum);
810 spin_unlock_irq (&dum->lock);
812 usb_hcd_poll_rh_status (dummy_to_hcd (dum));
815 EXPORT_SYMBOL(usb_gadget_probe_driver);
818 usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
820 struct dummy *dum = the_controller;
825 if (!driver || driver != dum->driver || !driver->unbind)
828 dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n",
829 driver->driver.name);
831 spin_lock_irqsave (&dum->lock, flags);
833 set_link_state (dum);
834 spin_unlock_irqrestore (&dum->lock, flags);
836 driver->unbind (&dum->gadget);
837 dum->gadget.dev.driver = NULL;
840 spin_lock_irqsave (&dum->lock, flags);
842 set_link_state (dum);
843 spin_unlock_irqrestore (&dum->lock, flags);
845 usb_hcd_poll_rh_status (dummy_to_hcd (dum));
848 EXPORT_SYMBOL (usb_gadget_unregister_driver);
852 /* just declare this in any driver that really need it */
853 extern int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode);
855 int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
859 EXPORT_SYMBOL (net2280_set_fifo_mode);
862 /* The gadget structure is stored inside the hcd structure and will be
863 * released along with it. */
865 dummy_gadget_release (struct device *dev)
867 struct dummy *dum = gadget_dev_to_dummy (dev);
869 usb_put_hcd (dummy_to_hcd (dum));
872 static int dummy_udc_probe (struct platform_device *pdev)
874 struct dummy *dum = the_controller;
877 usb_get_hcd(dummy_to_hcd(dum));
879 dum->gadget.name = gadget_name;
880 dum->gadget.ops = &dummy_ops;
881 dum->gadget.is_dualspeed = 1;
883 /* maybe claim OTG support, though we won't complete HNP */
884 dum->gadget.is_otg = (dummy_to_hcd(dum)->self.otg_port != 0);
886 dev_set_name(&dum->gadget.dev, "gadget");
887 dum->gadget.dev.parent = &pdev->dev;
888 dum->gadget.dev.release = dummy_gadget_release;
889 rc = device_register (&dum->gadget.dev);
891 put_device(&dum->gadget.dev);
895 rc = device_create_file (&dum->gadget.dev, &dev_attr_function);
897 device_unregister (&dum->gadget.dev);
899 platform_set_drvdata(pdev, dum);
903 static int dummy_udc_remove (struct platform_device *pdev)
905 struct dummy *dum = platform_get_drvdata (pdev);
907 platform_set_drvdata (pdev, NULL);
908 device_remove_file (&dum->gadget.dev, &dev_attr_function);
909 device_unregister (&dum->gadget.dev);
913 static int dummy_udc_suspend (struct platform_device *pdev, pm_message_t state)
915 struct dummy *dum = platform_get_drvdata(pdev);
917 dev_dbg (&pdev->dev, "%s\n", __func__);
918 spin_lock_irq (&dum->lock);
919 dum->udc_suspended = 1;
920 set_link_state (dum);
921 spin_unlock_irq (&dum->lock);
923 usb_hcd_poll_rh_status (dummy_to_hcd (dum));
927 static int dummy_udc_resume (struct platform_device *pdev)
929 struct dummy *dum = platform_get_drvdata(pdev);
931 dev_dbg (&pdev->dev, "%s\n", __func__);
932 spin_lock_irq (&dum->lock);
933 dum->udc_suspended = 0;
934 set_link_state (dum);
935 spin_unlock_irq (&dum->lock);
937 usb_hcd_poll_rh_status (dummy_to_hcd (dum));
941 static struct platform_driver dummy_udc_driver = {
942 .probe = dummy_udc_probe,
943 .remove = dummy_udc_remove,
944 .suspend = dummy_udc_suspend,
945 .resume = dummy_udc_resume,
947 .name = (char *) gadget_name,
948 .owner = THIS_MODULE,
952 /*-------------------------------------------------------------------------*/
954 /* MASTER/HOST SIDE DRIVER
956 * this uses the hcd framework to hook up to host side drivers.
957 * its root hub will only have one device, otherwise it acts like
958 * a normal host controller.
960 * when urbs are queued, they're just stuck on a list that we
961 * scan in a timer callback. that callback connects writes from
962 * the host with reads from the device, and so on, based on the
966 static int dummy_urb_enqueue (
976 if (!urb->transfer_buffer && urb->transfer_buffer_length)
979 urbp = kmalloc (sizeof *urbp, mem_flags);
984 dum = hcd_to_dummy (hcd);
985 spin_lock_irqsave (&dum->lock, flags);
986 rc = usb_hcd_link_urb_to_ep(hcd, urb);
993 dum->udev = urb->dev;
994 usb_get_dev (dum->udev);
995 } else if (unlikely (dum->udev != urb->dev))
996 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
998 list_add_tail (&urbp->urbp_list, &dum->urbp_list);
1000 if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
1001 urb->error_count = 1; /* mark as a new urb */
1003 /* kick the scheduler, it'll do the rest */
1004 if (!timer_pending (&dum->timer))
1005 mod_timer (&dum->timer, jiffies + 1);
1008 spin_unlock_irqrestore(&dum->lock, flags);
1012 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1015 unsigned long flags;
1018 /* giveback happens automatically in timer callback,
1019 * so make sure the callback happens */
1020 dum = hcd_to_dummy (hcd);
1021 spin_lock_irqsave (&dum->lock, flags);
1023 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1024 if (!rc && dum->rh_state != DUMMY_RH_RUNNING &&
1025 !list_empty(&dum->urbp_list))
1026 mod_timer (&dum->timer, jiffies);
1028 spin_unlock_irqrestore (&dum->lock, flags);
1032 /* transfer up to a frame's worth; caller must own lock */
1034 transfer(struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit,
1037 struct dummy_request *req;
1040 /* if there's no request queued, the device is NAKing; return */
1041 list_for_each_entry (req, &ep->queue, queue) {
1042 unsigned host_len, dev_len, len;
1043 int is_short, to_host;
1046 /* 1..N packets of ep->ep.maxpacket each ... the last one
1047 * may be short (including zero length).
1049 * writer can send a zlp explicitly (length 0) or implicitly
1050 * (length mod maxpacket zero, and 'zero' flag); they always
1053 host_len = urb->transfer_buffer_length - urb->actual_length;
1054 dev_len = req->req.length - req->req.actual;
1055 len = min (host_len, dev_len);
1057 /* FIXME update emulated data toggle too */
1059 to_host = usb_pipein (urb->pipe);
1060 if (unlikely (len == 0))
1065 /* not enough bandwidth left? */
1066 if (limit < ep->ep.maxpacket && limit < len)
1068 len = min (len, (unsigned) limit);
1072 /* use an extra pass for the final short packet */
1073 if (len > ep->ep.maxpacket) {
1075 len -= (len % ep->ep.maxpacket);
1077 is_short = (len % ep->ep.maxpacket) != 0;
1079 /* else transfer packet(s) */
1080 ubuf = urb->transfer_buffer + urb->actual_length;
1081 rbuf = req->req.buf + req->req.actual;
1083 memcpy (ubuf, rbuf, len);
1085 memcpy (rbuf, ubuf, len);
1086 ep->last_io = jiffies;
1089 urb->actual_length += len;
1090 req->req.actual += len;
1093 /* short packets terminate, maybe with overflow/underflow.
1094 * it's only really an error to write too much.
1096 * partially filling a buffer optionally blocks queue advances
1097 * (so completion handlers can clean up the queue) but we don't
1098 * need to emulate such data-in-flight.
1101 if (host_len == dev_len) {
1102 req->req.status = 0;
1104 } else if (to_host) {
1105 req->req.status = 0;
1106 if (dev_len > host_len)
1107 *status = -EOVERFLOW;
1110 } else if (!to_host) {
1112 if (host_len > dev_len)
1113 req->req.status = -EOVERFLOW;
1115 req->req.status = 0;
1118 /* many requests terminate without a short packet */
1120 if (req->req.length == req->req.actual
1122 req->req.status = 0;
1123 if (urb->transfer_buffer_length == urb->actual_length
1124 && !(urb->transfer_flags
1129 /* device side completion --> continuable */
1130 if (req->req.status != -EINPROGRESS) {
1131 list_del_init (&req->queue);
1133 spin_unlock (&dum->lock);
1134 req->req.complete (&ep->ep, &req->req);
1135 spin_lock (&dum->lock);
1137 /* requests might have been unlinked... */
1141 /* host side completion --> terminate */
1142 if (*status != -EINPROGRESS)
1145 /* rescan to continue with any other queued i/o */
1152 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1154 int limit = ep->ep.maxpacket;
1156 if (dum->gadget.speed == USB_SPEED_HIGH) {
1159 /* high bandwidth mode */
1160 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1161 tmp = (tmp >> 11) & 0x03;
1162 tmp *= 8 /* applies to entire frame */;
1163 limit += limit * tmp;
1168 #define is_active(dum) ((dum->port_status & \
1169 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1170 USB_PORT_STAT_SUSPEND)) \
1171 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1173 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1177 if (!is_active (dum))
1179 if ((address & ~USB_DIR_IN) == 0)
1180 return &dum->ep [0];
1181 for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1182 struct dummy_ep *ep = &dum->ep [i];
1186 if (ep->desc->bEndpointAddress == address)
1194 #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1195 #define Dev_InRequest (Dev_Request | USB_DIR_IN)
1196 #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1197 #define Intf_InRequest (Intf_Request | USB_DIR_IN)
1198 #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1199 #define Ep_InRequest (Ep_Request | USB_DIR_IN)
1203 * handle_control_request() - handles all control transfers
1204 * @dum: pointer to dummy (the_controller)
1205 * @urb: the urb request to handle
1206 * @setup: pointer to the setup data for a USB device control
1208 * @status: pointer to request handling status
1210 * Return 0 - if the request was handled
1211 * 1 - if the request wasn't handles
1212 * error code on error
1214 static int handle_control_request(struct dummy *dum, struct urb *urb,
1215 struct usb_ctrlrequest *setup,
1218 struct dummy_ep *ep2;
1223 w_index = le16_to_cpu(setup->wIndex);
1224 w_value = le16_to_cpu(setup->wValue);
1225 switch (setup->bRequest) {
1226 case USB_REQ_SET_ADDRESS:
1227 if (setup->bRequestType != Dev_Request)
1229 dum->address = w_value;
1231 dev_dbg(udc_dev(dum), "set_address = %d\n",
1235 case USB_REQ_SET_FEATURE:
1236 if (setup->bRequestType == Dev_Request) {
1239 case USB_DEVICE_REMOTE_WAKEUP:
1241 case USB_DEVICE_B_HNP_ENABLE:
1242 dum->gadget.b_hnp_enable = 1;
1244 case USB_DEVICE_A_HNP_SUPPORT:
1245 dum->gadget.a_hnp_support = 1;
1247 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1248 dum->gadget.a_alt_hnp_support = 1;
1251 ret_val = -EOPNOTSUPP;
1254 dum->devstatus |= (1 << w_value);
1257 } else if (setup->bRequestType == Ep_Request) {
1259 ep2 = find_endpoint(dum, w_index);
1260 if (!ep2 || ep2->ep.name == ep0name) {
1261 ret_val = -EOPNOTSUPP;
1269 case USB_REQ_CLEAR_FEATURE:
1270 if (setup->bRequestType == Dev_Request) {
1273 case USB_DEVICE_REMOTE_WAKEUP:
1274 w_value = USB_DEVICE_REMOTE_WAKEUP;
1277 ret_val = -EOPNOTSUPP;
1281 dum->devstatus &= ~(1 << w_value);
1284 } else if (setup->bRequestType == Ep_Request) {
1286 ep2 = find_endpoint(dum, w_index);
1288 ret_val = -EOPNOTSUPP;
1297 case USB_REQ_GET_STATUS:
1298 if (setup->bRequestType == Dev_InRequest
1299 || setup->bRequestType == Intf_InRequest
1300 || setup->bRequestType == Ep_InRequest) {
1303 * device: remote wakeup, selfpowered
1304 * interface: nothing
1307 buf = (char *)urb->transfer_buffer;
1308 if (urb->transfer_buffer_length > 0) {
1309 if (setup->bRequestType == Ep_InRequest) {
1310 ep2 = find_endpoint(dum, w_index);
1312 ret_val = -EOPNOTSUPP;
1315 buf[0] = ep2->halted;
1316 } else if (setup->bRequestType ==
1318 buf[0] = (u8)dum->devstatus;
1322 if (urb->transfer_buffer_length > 1)
1324 urb->actual_length = min_t(u32, 2,
1325 urb->transfer_buffer_length);
1334 /* drive both sides of the transfers; looks like irq handlers to
1335 * both drivers except the callbacks aren't in_irq().
1337 static void dummy_timer (unsigned long _dum)
1339 struct dummy *dum = (struct dummy *) _dum;
1340 struct urbp *urbp, *tmp;
1341 unsigned long flags;
1345 /* simplistic model for one frame's bandwidth */
1346 switch (dum->gadget.speed) {
1348 total = 8/*bytes*/ * 12/*packets*/;
1350 case USB_SPEED_FULL:
1351 total = 64/*bytes*/ * 19/*packets*/;
1353 case USB_SPEED_HIGH:
1354 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1357 dev_err (dummy_dev(dum), "bogus device speed\n");
1361 /* FIXME if HZ != 1000 this will probably misbehave ... */
1363 /* look at each urb queued by the host side driver */
1364 spin_lock_irqsave (&dum->lock, flags);
1367 dev_err (dummy_dev(dum),
1368 "timer fired with no URBs pending?\n");
1369 spin_unlock_irqrestore (&dum->lock, flags);
1373 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1376 dum->ep [i].already_seen = 0;
1380 list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1382 struct dummy_request *req;
1384 struct dummy_ep *ep = NULL;
1386 int status = -EINPROGRESS;
1391 else if (dum->rh_state != DUMMY_RH_RUNNING)
1393 type = usb_pipetype (urb->pipe);
1395 /* used up this frame's non-periodic bandwidth?
1396 * FIXME there's infinite bandwidth for control and
1397 * periodic transfers ... unrealistic.
1399 if (total <= 0 && type == PIPE_BULK)
1402 /* find the gadget's ep for this request (if configured) */
1403 address = usb_pipeendpoint (urb->pipe);
1404 if (usb_pipein (urb->pipe))
1405 address |= USB_DIR_IN;
1406 ep = find_endpoint(dum, address);
1408 /* set_configuration() disagreement */
1409 dev_dbg (dummy_dev(dum),
1410 "no ep configured for urb %p\n",
1416 if (ep->already_seen)
1418 ep->already_seen = 1;
1419 if (ep == &dum->ep [0] && urb->error_count) {
1420 ep->setup_stage = 1; /* a new urb */
1421 urb->error_count = 0;
1423 if (ep->halted && !ep->setup_stage) {
1424 /* NOTE: must not be iso! */
1425 dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1430 /* FIXME make sure both ends agree on maxpacket */
1432 /* handle control requests */
1433 if (ep == &dum->ep [0] && ep->setup_stage) {
1434 struct usb_ctrlrequest setup;
1437 setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1438 /* paranoia, in case of stale queued data */
1439 list_for_each_entry (req, &ep->queue, queue) {
1440 list_del_init (&req->queue);
1441 req->req.status = -EOVERFLOW;
1442 dev_dbg (udc_dev(dum), "stale req = %p\n",
1445 spin_unlock (&dum->lock);
1446 req->req.complete (&ep->ep, &req->req);
1447 spin_lock (&dum->lock);
1448 ep->already_seen = 0;
1452 /* gadget driver never sees set_address or operations
1453 * on standard feature flags. some hardware doesn't
1456 ep->last_io = jiffies;
1457 ep->setup_stage = 0;
1460 value = handle_control_request(dum, urb, &setup,
1463 /* gadget driver handles all other requests. block
1464 * until setup() returns; no reentrancy issues etc.
1467 spin_unlock (&dum->lock);
1468 value = dum->driver->setup (&dum->gadget,
1470 spin_lock (&dum->lock);
1473 /* no delays (max 64KB data stage) */
1475 goto treat_control_like_bulk;
1477 /* error, see below */
1481 if (value != -EOPNOTSUPP)
1482 dev_dbg (udc_dev(dum),
1486 urb->actual_length = 0;
1492 /* non-control requests */
1494 switch (usb_pipetype (urb->pipe)) {
1495 case PIPE_ISOCHRONOUS:
1496 /* FIXME is it urb->interval since the last xfer?
1497 * use urb->iso_frame_desc[i].
1498 * complete whether or not ep has requests queued.
1499 * report random errors, to debug drivers.
1501 limit = max (limit, periodic_bytes (dum, ep));
1505 case PIPE_INTERRUPT:
1506 /* FIXME is it urb->interval since the last xfer?
1507 * this almost certainly polls too fast.
1509 limit = max (limit, periodic_bytes (dum, ep));
1512 // case PIPE_BULK: case PIPE_CONTROL:
1514 treat_control_like_bulk:
1515 ep->last_io = jiffies;
1516 total = transfer(dum, urb, ep, limit, &status);
1520 /* incomplete transfer? */
1521 if (status == -EINPROGRESS)
1525 list_del (&urbp->urbp_list);
1528 ep->already_seen = ep->setup_stage = 0;
1530 usb_hcd_unlink_urb_from_ep(dummy_to_hcd(dum), urb);
1531 spin_unlock (&dum->lock);
1532 usb_hcd_giveback_urb(dummy_to_hcd(dum), urb, status);
1533 spin_lock (&dum->lock);
1538 if (list_empty (&dum->urbp_list)) {
1539 usb_put_dev (dum->udev);
1541 } else if (dum->rh_state == DUMMY_RH_RUNNING) {
1542 /* want a 1 msec delay here */
1543 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1546 spin_unlock_irqrestore (&dum->lock, flags);
1549 /*-------------------------------------------------------------------------*/
1551 #define PORT_C_MASK \
1552 ((USB_PORT_STAT_C_CONNECTION \
1553 | USB_PORT_STAT_C_ENABLE \
1554 | USB_PORT_STAT_C_SUSPEND \
1555 | USB_PORT_STAT_C_OVERCURRENT \
1556 | USB_PORT_STAT_C_RESET) << 16)
1558 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1561 unsigned long flags;
1564 dum = hcd_to_dummy (hcd);
1566 spin_lock_irqsave (&dum->lock, flags);
1567 if (!HCD_HW_ACCESSIBLE(hcd))
1570 if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) {
1571 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1572 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1573 set_link_state (dum);
1576 if ((dum->port_status & PORT_C_MASK) != 0) {
1578 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1581 if (dum->rh_state == DUMMY_RH_SUSPENDED)
1582 usb_hcd_resume_root_hub (hcd);
1585 spin_unlock_irqrestore (&dum->lock, flags);
1590 hub_descriptor (struct usb_hub_descriptor *desc)
1592 memset (desc, 0, sizeof *desc);
1593 desc->bDescriptorType = 0x29;
1594 desc->bDescLength = 9;
1595 desc->wHubCharacteristics = cpu_to_le16(0x0001);
1596 desc->bNbrPorts = 1;
1597 desc->u.hs.DeviceRemovable[0] = 0xff;
1598 desc->u.hs.DeviceRemovable[1] = 0xff;
1601 static int dummy_hub_control (
1602 struct usb_hcd *hcd,
1611 unsigned long flags;
1613 if (!HCD_HW_ACCESSIBLE(hcd))
1616 dum = hcd_to_dummy (hcd);
1617 spin_lock_irqsave (&dum->lock, flags);
1619 case ClearHubFeature:
1621 case ClearPortFeature:
1623 case USB_PORT_FEAT_SUSPEND:
1624 if (dum->port_status & USB_PORT_STAT_SUSPEND) {
1625 /* 20msec resume signaling */
1627 dum->re_timeout = jiffies +
1628 msecs_to_jiffies(20);
1631 case USB_PORT_FEAT_POWER:
1632 if (dum->port_status & USB_PORT_STAT_POWER)
1633 dev_dbg (dummy_dev(dum), "power-off\n");
1636 dum->port_status &= ~(1 << wValue);
1637 set_link_state (dum);
1640 case GetHubDescriptor:
1641 hub_descriptor ((struct usb_hub_descriptor *) buf);
1644 *(__le32 *) buf = cpu_to_le32 (0);
1650 /* whoever resets or resumes must GetPortStatus to
1653 if (dum->resuming &&
1654 time_after_eq (jiffies, dum->re_timeout)) {
1655 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1656 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1658 if ((dum->port_status & USB_PORT_STAT_RESET) != 0 &&
1659 time_after_eq (jiffies, dum->re_timeout)) {
1660 dum->port_status |= (USB_PORT_STAT_C_RESET << 16);
1661 dum->port_status &= ~USB_PORT_STAT_RESET;
1663 dum->port_status |= USB_PORT_STAT_ENABLE;
1664 /* give it the best speed we agree on */
1665 dum->gadget.speed = dum->driver->speed;
1666 dum->gadget.ep0->maxpacket = 64;
1667 switch (dum->gadget.speed) {
1668 case USB_SPEED_HIGH:
1670 USB_PORT_STAT_HIGH_SPEED;
1673 dum->gadget.ep0->maxpacket = 8;
1675 USB_PORT_STAT_LOW_SPEED;
1678 dum->gadget.speed = USB_SPEED_FULL;
1683 set_link_state (dum);
1684 ((__le16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1685 ((__le16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1690 case SetPortFeature:
1692 case USB_PORT_FEAT_SUSPEND:
1694 dum->port_status |= USB_PORT_STAT_SUSPEND;
1696 /* HNP would happen here; for now we
1697 * assume b_bus_req is always true.
1699 set_link_state (dum);
1700 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1701 & dum->devstatus) != 0)
1702 dev_dbg (dummy_dev(dum),
1706 case USB_PORT_FEAT_POWER:
1707 dum->port_status |= USB_PORT_STAT_POWER;
1708 set_link_state (dum);
1710 case USB_PORT_FEAT_RESET:
1711 /* if it's already enabled, disable */
1712 dum->port_status &= ~(USB_PORT_STAT_ENABLE
1713 | USB_PORT_STAT_LOW_SPEED
1714 | USB_PORT_STAT_HIGH_SPEED);
1716 /* 50msec reset signaling */
1717 dum->re_timeout = jiffies + msecs_to_jiffies(50);
1720 if ((dum->port_status & USB_PORT_STAT_POWER) != 0) {
1721 dum->port_status |= (1 << wValue);
1722 set_link_state (dum);
1728 dev_dbg (dummy_dev(dum),
1729 "hub control req%04x v%04x i%04x l%d\n",
1730 typeReq, wValue, wIndex, wLength);
1732 /* "protocol stall" on error */
1735 spin_unlock_irqrestore (&dum->lock, flags);
1737 if ((dum->port_status & PORT_C_MASK) != 0)
1738 usb_hcd_poll_rh_status (hcd);
1742 static int dummy_bus_suspend (struct usb_hcd *hcd)
1744 struct dummy *dum = hcd_to_dummy (hcd);
1746 dev_dbg (&hcd->self.root_hub->dev, "%s\n", __func__);
1748 spin_lock_irq (&dum->lock);
1749 dum->rh_state = DUMMY_RH_SUSPENDED;
1750 set_link_state (dum);
1751 hcd->state = HC_STATE_SUSPENDED;
1752 spin_unlock_irq (&dum->lock);
1756 static int dummy_bus_resume (struct usb_hcd *hcd)
1758 struct dummy *dum = hcd_to_dummy (hcd);
1761 dev_dbg (&hcd->self.root_hub->dev, "%s\n", __func__);
1763 spin_lock_irq (&dum->lock);
1764 if (!HCD_HW_ACCESSIBLE(hcd)) {
1767 dum->rh_state = DUMMY_RH_RUNNING;
1768 set_link_state (dum);
1769 if (!list_empty(&dum->urbp_list))
1770 mod_timer (&dum->timer, jiffies);
1771 hcd->state = HC_STATE_RUNNING;
1773 spin_unlock_irq (&dum->lock);
1777 /*-------------------------------------------------------------------------*/
1779 static inline ssize_t
1780 show_urb (char *buf, size_t size, struct urb *urb)
1782 int ep = usb_pipeendpoint (urb->pipe);
1784 return snprintf (buf, size,
1785 "urb/%p %s ep%d%s%s len %d/%d\n",
1788 switch (urb->dev->speed) {
1789 case USB_SPEED_LOW: s = "ls"; break;
1790 case USB_SPEED_FULL: s = "fs"; break;
1791 case USB_SPEED_HIGH: s = "hs"; break;
1792 default: s = "?"; break;
1794 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1796 switch (usb_pipetype (urb->pipe)) { \
1797 case PIPE_CONTROL: s = ""; break; \
1798 case PIPE_BULK: s = "-bulk"; break; \
1799 case PIPE_INTERRUPT: s = "-int"; break; \
1800 default: s = "-iso"; break; \
1802 urb->actual_length, urb->transfer_buffer_length);
1806 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
1808 struct usb_hcd *hcd = dev_get_drvdata (dev);
1809 struct dummy *dum = hcd_to_dummy (hcd);
1812 unsigned long flags;
1814 spin_lock_irqsave (&dum->lock, flags);
1815 list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1818 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1822 spin_unlock_irqrestore (&dum->lock, flags);
1826 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1828 static int dummy_start (struct usb_hcd *hcd)
1832 dum = hcd_to_dummy (hcd);
1835 * MASTER side init ... we emulate a root hub that'll only ever
1836 * talk to one device (the slave side). Also appears in sysfs,
1837 * just like more familiar pci-based HCDs.
1839 spin_lock_init (&dum->lock);
1840 init_timer (&dum->timer);
1841 dum->timer.function = dummy_timer;
1842 dum->timer.data = (unsigned long) dum;
1843 dum->rh_state = DUMMY_RH_RUNNING;
1845 INIT_LIST_HEAD (&dum->urbp_list);
1847 hcd->power_budget = POWER_BUDGET;
1848 hcd->state = HC_STATE_RUNNING;
1849 hcd->uses_new_polling = 1;
1851 #ifdef CONFIG_USB_OTG
1852 hcd->self.otg_port = 1;
1855 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1856 return device_create_file (dummy_dev(dum), &dev_attr_urbs);
1859 static void dummy_stop (struct usb_hcd *hcd)
1863 dum = hcd_to_dummy (hcd);
1865 device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1866 usb_gadget_unregister_driver (dum->driver);
1867 dev_info (dummy_dev(dum), "stopped\n");
1870 /*-------------------------------------------------------------------------*/
1872 static int dummy_h_get_frame (struct usb_hcd *hcd)
1874 return dummy_g_get_frame (NULL);
1877 static const struct hc_driver dummy_hcd = {
1878 .description = (char *) driver_name,
1879 .product_desc = "Dummy host controller",
1880 .hcd_priv_size = sizeof(struct dummy),
1884 .start = dummy_start,
1887 .urb_enqueue = dummy_urb_enqueue,
1888 .urb_dequeue = dummy_urb_dequeue,
1890 .get_frame_number = dummy_h_get_frame,
1892 .hub_status_data = dummy_hub_status,
1893 .hub_control = dummy_hub_control,
1894 .bus_suspend = dummy_bus_suspend,
1895 .bus_resume = dummy_bus_resume,
1898 static int dummy_hcd_probe(struct platform_device *pdev)
1900 struct usb_hcd *hcd;
1903 dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1905 hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
1908 the_controller = hcd_to_dummy (hcd);
1910 retval = usb_add_hcd(hcd, 0, 0);
1913 the_controller = NULL;
1918 static int dummy_hcd_remove (struct platform_device *pdev)
1920 struct usb_hcd *hcd;
1922 hcd = platform_get_drvdata (pdev);
1923 usb_remove_hcd (hcd);
1925 the_controller = NULL;
1929 static int dummy_hcd_suspend (struct platform_device *pdev, pm_message_t state)
1931 struct usb_hcd *hcd;
1935 dev_dbg (&pdev->dev, "%s\n", __func__);
1937 hcd = platform_get_drvdata (pdev);
1938 dum = hcd_to_dummy (hcd);
1939 if (dum->rh_state == DUMMY_RH_RUNNING) {
1940 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
1943 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1947 static int dummy_hcd_resume (struct platform_device *pdev)
1949 struct usb_hcd *hcd;
1951 dev_dbg (&pdev->dev, "%s\n", __func__);
1953 hcd = platform_get_drvdata (pdev);
1954 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1955 usb_hcd_poll_rh_status (hcd);
1959 static struct platform_driver dummy_hcd_driver = {
1960 .probe = dummy_hcd_probe,
1961 .remove = dummy_hcd_remove,
1962 .suspend = dummy_hcd_suspend,
1963 .resume = dummy_hcd_resume,
1965 .name = (char *) driver_name,
1966 .owner = THIS_MODULE,
1970 /*-------------------------------------------------------------------------*/
1972 static struct platform_device *the_udc_pdev;
1973 static struct platform_device *the_hcd_pdev;
1975 static int __init init (void)
1977 int retval = -ENOMEM;
1979 if (usb_disabled ())
1982 the_hcd_pdev = platform_device_alloc(driver_name, -1);
1985 the_udc_pdev = platform_device_alloc(gadget_name, -1);
1989 retval = platform_driver_register(&dummy_hcd_driver);
1991 goto err_register_hcd_driver;
1992 retval = platform_driver_register(&dummy_udc_driver);
1994 goto err_register_udc_driver;
1996 retval = platform_device_add(the_hcd_pdev);
1999 if (!the_controller) {
2001 * The hcd was added successfully but its probe function failed
2007 retval = platform_device_add(the_udc_pdev);
2010 if (!platform_get_drvdata(the_udc_pdev)) {
2012 * The udc was added successfully but its probe function failed
2021 platform_device_del(the_udc_pdev);
2023 platform_device_del(the_hcd_pdev);
2025 platform_driver_unregister(&dummy_udc_driver);
2026 err_register_udc_driver:
2027 platform_driver_unregister(&dummy_hcd_driver);
2028 err_register_hcd_driver:
2029 platform_device_put(the_udc_pdev);
2031 platform_device_put(the_hcd_pdev);
2036 static void __exit cleanup (void)
2038 platform_device_unregister(the_udc_pdev);
2039 platform_device_unregister(the_hcd_pdev);
2040 platform_driver_unregister(&dummy_udc_driver);
2041 platform_driver_unregister(&dummy_hcd_driver);
2043 module_exit (cleanup);