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.
39 #include <linux/config.h>
40 #include <linux/module.h>
41 #include <linux/kernel.h>
42 #include <linux/delay.h>
43 #include <linux/ioport.h>
44 #include <linux/sched.h>
45 #include <linux/slab.h>
46 #include <linux/smp_lock.h>
47 #include <linux/errno.h>
48 #include <linux/init.h>
49 #include <linux/timer.h>
50 #include <linux/list.h>
51 #include <linux/interrupt.h>
52 #include <linux/version.h>
54 #include <linux/usb.h>
55 #include <linux/usb_gadget.h>
57 #include <asm/byteorder.h>
60 #include <asm/system.h>
61 #include <asm/unaligned.h>
64 #include "../core/hcd.h"
67 #define DRIVER_DESC "USB Host+Gadget Emulator"
68 #define DRIVER_VERSION "17 Dec 2004"
70 static const char driver_name [] = "dummy_hcd";
71 static const char driver_desc [] = "USB Host+Gadget Emulator";
73 static const char gadget_name [] = "dummy_udc";
75 MODULE_DESCRIPTION (DRIVER_DESC);
76 MODULE_AUTHOR ("David Brownell");
77 MODULE_LICENSE ("GPL");
79 /*-------------------------------------------------------------------------*/
81 /* gadget side driver data structres */
83 struct list_head queue;
84 unsigned long last_io; /* jiffies timestamp */
85 struct usb_gadget *gadget;
86 const struct usb_endpoint_descriptor *desc;
89 unsigned already_seen : 1;
90 unsigned setup_stage : 1;
93 struct dummy_request {
94 struct list_head queue; /* ep's requests */
95 struct usb_request req;
98 static inline struct dummy_ep *usb_ep_to_dummy_ep (struct usb_ep *_ep)
100 return container_of (_ep, struct dummy_ep, ep);
103 static inline struct dummy_request *usb_request_to_dummy_request
104 (struct usb_request *_req)
106 return container_of (_req, struct dummy_request, req);
109 /*-------------------------------------------------------------------------*/
112 * Every device has ep0 for control requests, plus up to 30 more endpoints,
113 * in one of two types:
115 * - Configurable: direction (in/out), type (bulk, iso, etc), and endpoint
116 * number can be changed. Names like "ep-a" are used for this type.
118 * - Fixed Function: in other cases. some characteristics may be mutable;
119 * that'd be hardware-specific. Names like "ep12out-bulk" are used.
121 * Gadget drivers are responsible for not setting up conflicting endpoint
122 * configurations, illegal or unsupported packet lengths, and so on.
125 static const char ep0name [] = "ep0";
127 static const char *const ep_name [] = {
128 ep0name, /* everyone has ep0 */
130 /* act like a net2280: high speed, six configurable endpoints */
131 "ep-a", "ep-b", "ep-c", "ep-d", "ep-e", "ep-f",
133 /* or like pxa250: fifteen fixed function endpoints */
134 "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
135 "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
136 "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
139 /* or like sa1100: two fixed function endpoints */
140 "ep1out-bulk", "ep2in-bulk",
142 #define DUMMY_ENDPOINTS (sizeof(ep_name)/sizeof(char *))
144 /*-------------------------------------------------------------------------*/
150 struct list_head urbp_list;
157 * SLAVE/GADGET side support
159 struct dummy_ep ep [DUMMY_ENDPOINTS];
161 struct usb_gadget gadget;
162 struct usb_gadget_driver *driver;
163 struct dummy_request fifo_req;
164 u8 fifo_buf [FIFO_SIZE];
168 unsigned old_active:1;
171 * MASTER/HOST side support
173 struct timer_list timer;
177 unsigned long re_timeout;
179 struct usb_device *udev;
180 struct list_head urbp_list;
183 static inline struct dummy *hcd_to_dummy (struct usb_hcd *hcd)
185 return (struct dummy *) (hcd->hcd_priv);
188 static inline struct usb_hcd *dummy_to_hcd (struct dummy *dum)
190 return container_of((void *) dum, struct usb_hcd, hcd_priv);
193 static inline struct device *dummy_dev (struct dummy *dum)
195 return dummy_to_hcd(dum)->self.controller;
198 static inline struct device *udc_dev (struct dummy *dum)
200 return dum->gadget.dev.parent;
203 static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
205 return container_of (ep->gadget, struct dummy, gadget);
208 static inline struct dummy *gadget_to_dummy (struct usb_gadget *gadget)
210 return container_of (gadget, struct dummy, gadget);
213 static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
215 return container_of (dev, struct dummy, gadget.dev);
218 static struct dummy *the_controller;
220 /*-------------------------------------------------------------------------*/
222 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
224 /* called with spinlock held */
225 static void nuke (struct dummy *dum, struct dummy_ep *ep)
227 while (!list_empty (&ep->queue)) {
228 struct dummy_request *req;
230 req = list_entry (ep->queue.next, struct dummy_request, queue);
231 list_del_init (&req->queue);
232 req->req.status = -ESHUTDOWN;
234 spin_unlock (&dum->lock);
235 req->req.complete (&ep->ep, &req->req);
236 spin_lock (&dum->lock);
240 /* caller must hold lock */
242 stop_activity (struct dummy *dum)
246 /* prevent any more requests */
249 /* The timer is left running so that outstanding URBs can fail */
251 /* nuke any pending requests first, so driver i/o is quiesced */
252 list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
255 /* driver now does any non-usb quiescing necessary */
258 /* caller must hold lock */
260 set_link_state (struct dummy *dum)
263 if ((dum->port_status & USB_PORT_STAT_POWER) == 0)
264 dum->port_status = 0;
265 else if (!dum->pullup) {
266 dum->port_status &= ~(USB_PORT_STAT_CONNECTION |
267 USB_PORT_STAT_ENABLE |
268 USB_PORT_STAT_LOW_SPEED |
269 USB_PORT_STAT_HIGH_SPEED |
270 USB_PORT_STAT_SUSPEND);
271 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0)
272 dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
274 dum->port_status |= USB_PORT_STAT_CONNECTION;
275 if ((dum->old_status & USB_PORT_STAT_CONNECTION) == 0)
276 dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
277 if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0)
278 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
279 else if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0)
283 if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0 || dum->active)
286 if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
287 (dum->port_status & USB_PORT_STAT_RESET) != 0) {
288 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0 &&
289 (dum->old_status & USB_PORT_STAT_RESET) == 0 &&
292 spin_unlock (&dum->lock);
293 dum->driver->disconnect (&dum->gadget);
294 spin_lock (&dum->lock);
296 } else if (dum->active != dum->old_active) {
297 if (dum->old_active && dum->driver->suspend) {
298 spin_unlock (&dum->lock);
299 dum->driver->suspend (&dum->gadget);
300 spin_lock (&dum->lock);
301 } else if (!dum->old_active && dum->driver->resume) {
302 spin_unlock (&dum->lock);
303 dum->driver->resume (&dum->gadget);
304 spin_lock (&dum->lock);
308 dum->old_status = dum->port_status;
309 dum->old_active = dum->active;
312 /*-------------------------------------------------------------------------*/
314 /* SLAVE/GADGET SIDE DRIVER
316 * This only tracks gadget state. All the work is done when the host
317 * side tries some (emulated) i/o operation. Real device controller
318 * drivers would do real i/o using dma, fifos, irqs, timers, etc.
321 #define is_enabled(dum) \
322 (dum->port_status & USB_PORT_STAT_ENABLE)
325 dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
332 ep = usb_ep_to_dummy_ep (_ep);
333 if (!_ep || !desc || ep->desc || _ep->name == ep0name
334 || desc->bDescriptorType != USB_DT_ENDPOINT)
336 dum = ep_to_dummy (ep);
337 if (!dum->driver || !is_enabled (dum))
339 max = le16_to_cpu(desc->wMaxPacketSize) & 0x3ff;
341 /* drivers must not request bad settings, since lower levels
342 * (hardware or its drivers) may not check. some endpoints
343 * can't do iso, many have maxpacket limitations, etc.
345 * since this "hardware" driver is here to help debugging, we
346 * have some extra sanity checks. (there could be more though,
347 * especially for "ep9out" style fixed function ones.)
350 switch (desc->bmAttributes & 0x03) {
351 case USB_ENDPOINT_XFER_BULK:
352 if (strstr (ep->ep.name, "-iso")
353 || strstr (ep->ep.name, "-int")) {
356 switch (dum->gadget.speed) {
360 /* conserve return statements */
363 case 8: case 16: case 32: case 64:
364 /* we'll fake any legal size */
372 case USB_ENDPOINT_XFER_INT:
373 if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
375 /* real hardware might not handle all packet sizes */
376 switch (dum->gadget.speed) {
380 /* save a return statement */
384 /* save a return statement */
391 case USB_ENDPOINT_XFER_ISOC:
392 if (strstr (ep->ep.name, "-bulk")
393 || strstr (ep->ep.name, "-int"))
395 /* real hardware might not handle all packet sizes */
396 switch (dum->gadget.speed) {
400 /* save a return statement */
404 /* save a return statement */
410 /* few chips support control except on ep0 */
414 _ep->maxpacket = max;
417 dev_dbg (udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
419 desc->bEndpointAddress & 0x0f,
420 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
422 switch (desc->bmAttributes & 0x03) {
423 case USB_ENDPOINT_XFER_BULK: val = "bulk"; break;
424 case USB_ENDPOINT_XFER_ISOC: val = "iso"; break;
425 case USB_ENDPOINT_XFER_INT: val = "intr"; break;
426 default: val = "ctrl"; break;
430 /* at this point real hardware should be NAKing transfers
431 * to that endpoint, until a buffer is queued to it.
438 static int dummy_disable (struct usb_ep *_ep)
445 ep = usb_ep_to_dummy_ep (_ep);
446 if (!_ep || !ep->desc || _ep->name == ep0name)
448 dum = ep_to_dummy (ep);
450 spin_lock_irqsave (&dum->lock, flags);
454 spin_unlock_irqrestore (&dum->lock, flags);
456 dev_dbg (udc_dev(dum), "disabled %s\n", _ep->name);
460 static struct usb_request *
461 dummy_alloc_request (struct usb_ep *_ep, int mem_flags)
464 struct dummy_request *req;
468 ep = usb_ep_to_dummy_ep (_ep);
470 req = kmalloc (sizeof *req, mem_flags);
473 memset (req, 0, sizeof *req);
474 INIT_LIST_HEAD (&req->queue);
479 dummy_free_request (struct usb_ep *_ep, struct usb_request *_req)
482 struct dummy_request *req;
484 ep = usb_ep_to_dummy_ep (_ep);
485 if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
488 req = usb_request_to_dummy_request (_req);
489 WARN_ON (!list_empty (&req->queue));
504 ep = usb_ep_to_dummy_ep (_ep);
505 dum = ep_to_dummy (ep);
509 retval = kmalloc (bytes, mem_flags);
510 *dma = (dma_addr_t) retval;
526 fifo_complete (struct usb_ep *ep, struct usb_request *req)
531 dummy_queue (struct usb_ep *_ep, struct usb_request *_req, int mem_flags)
534 struct dummy_request *req;
538 req = usb_request_to_dummy_request (_req);
539 if (!_req || !list_empty (&req->queue) || !_req->complete)
542 ep = usb_ep_to_dummy_ep (_ep);
543 if (!_ep || (!ep->desc && _ep->name != ep0name))
546 dum = ep_to_dummy (ep);
547 if (!dum->driver || !is_enabled (dum))
551 dev_dbg (udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
552 ep, _req, _ep->name, _req->length, _req->buf);
555 _req->status = -EINPROGRESS;
557 spin_lock_irqsave (&dum->lock, flags);
559 /* implement an emulated single-request FIFO */
560 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
561 list_empty (&dum->fifo_req.queue) &&
562 list_empty (&ep->queue) &&
563 _req->length <= FIFO_SIZE) {
564 req = &dum->fifo_req;
566 req->req.buf = dum->fifo_buf;
567 memcpy (dum->fifo_buf, _req->buf, _req->length);
568 req->req.context = dum;
569 req->req.complete = fifo_complete;
571 spin_unlock (&dum->lock);
572 _req->actual = _req->length;
574 _req->complete (_ep, _req);
575 spin_lock (&dum->lock);
577 list_add_tail (&req->queue, &ep->queue);
578 spin_unlock_irqrestore (&dum->lock, flags);
580 /* real hardware would likely enable transfers here, in case
581 * it'd been left NAKing.
586 static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
590 int retval = -EINVAL;
592 struct dummy_request *req = NULL;
596 ep = usb_ep_to_dummy_ep (_ep);
597 dum = ep_to_dummy (ep);
602 spin_lock_irqsave (&dum->lock, flags);
603 list_for_each_entry (req, &ep->queue, queue) {
604 if (&req->req == _req) {
605 list_del_init (&req->queue);
606 _req->status = -ECONNRESET;
611 spin_unlock_irqrestore (&dum->lock, flags);
614 dev_dbg (udc_dev(dum),
615 "dequeued req %p from %s, len %d buf %p\n",
616 req, _ep->name, _req->length, _req->buf);
617 _req->complete (_ep, _req);
623 dummy_set_halt (struct usb_ep *_ep, int value)
630 ep = usb_ep_to_dummy_ep (_ep);
631 dum = ep_to_dummy (ep);
636 else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
637 !list_empty (&ep->queue))
641 /* FIXME clear emulated data toggle too */
645 static const struct usb_ep_ops dummy_ep_ops = {
646 .enable = dummy_enable,
647 .disable = dummy_disable,
649 .alloc_request = dummy_alloc_request,
650 .free_request = dummy_free_request,
652 .alloc_buffer = dummy_alloc_buffer,
653 .free_buffer = dummy_free_buffer,
654 /* map, unmap, ... eventually hook the "generic" dma calls */
656 .queue = dummy_queue,
657 .dequeue = dummy_dequeue,
659 .set_halt = dummy_set_halt,
662 /*-------------------------------------------------------------------------*/
664 /* there are both host and device side versions of this call ... */
665 static int dummy_g_get_frame (struct usb_gadget *_gadget)
669 do_gettimeofday (&tv);
670 return tv.tv_usec / 1000;
673 static int dummy_wakeup (struct usb_gadget *_gadget)
677 dum = gadget_to_dummy (_gadget);
678 if (!(dum->port_status & USB_PORT_STAT_SUSPEND)
679 || !(dum->devstatus &
680 ( (1 << USB_DEVICE_B_HNP_ENABLE)
681 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
684 /* hub notices our request, issues downstream resume, etc */
686 dum->re_timeout = jiffies + msecs_to_jiffies(20);
687 mod_timer (&dummy_to_hcd (dum)->rh_timer, dum->re_timeout);
691 static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
695 dum = gadget_to_dummy (_gadget);
697 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
699 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
703 static int dummy_pullup (struct usb_gadget *_gadget, int value)
708 dum = gadget_to_dummy (_gadget);
709 spin_lock_irqsave (&dum->lock, flags);
710 dum->pullup = (value != 0);
711 set_link_state (dum);
712 spin_unlock_irqrestore (&dum->lock, flags);
714 usb_hcd_poll_rh_status (dummy_to_hcd (dum));
718 static const struct usb_gadget_ops dummy_ops = {
719 .get_frame = dummy_g_get_frame,
720 .wakeup = dummy_wakeup,
721 .set_selfpowered = dummy_set_selfpowered,
722 .pullup = dummy_pullup,
725 /*-------------------------------------------------------------------------*/
727 /* "function" sysfs attribute */
729 show_function (struct device *dev, struct device_attribute *attr, char *buf)
731 struct dummy *dum = gadget_dev_to_dummy (dev);
733 if (!dum->driver || !dum->driver->function)
735 return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
737 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
739 /*-------------------------------------------------------------------------*/
742 * Driver registration/unregistration.
744 * This is basically hardware-specific; there's usually only one real USB
745 * device (not host) controller since that's how USB devices are intended
746 * to work. So most implementations of these api calls will rely on the
747 * fact that only one driver will ever bind to the hardware. But curious
748 * hardware can be built with discrete components, so the gadget API doesn't
749 * require that assumption.
751 * For this emulator, it might be convenient to create a usb slave device
752 * for each driver that registers: just add to a big root hub.
756 usb_gadget_register_driver (struct usb_gadget_driver *driver)
758 struct dummy *dum = the_controller;
765 if (!driver->bind || !driver->unbind || !driver->setup
766 || driver->speed == USB_SPEED_UNKNOWN)
770 * SLAVE side init ... the layer above hardware, which
771 * can't enumerate without help from the driver we're binding.
776 INIT_LIST_HEAD (&dum->gadget.ep_list);
777 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
778 struct dummy_ep *ep = &dum->ep [i];
782 ep->ep.name = ep_name [i];
783 ep->ep.ops = &dummy_ep_ops;
784 list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list);
785 ep->halted = ep->already_seen = ep->setup_stage = 0;
786 ep->ep.maxpacket = ~0;
787 ep->last_io = jiffies;
788 ep->gadget = &dum->gadget;
790 INIT_LIST_HEAD (&ep->queue);
793 dum->gadget.ep0 = &dum->ep [0].ep;
794 dum->ep [0].ep.maxpacket = 64;
795 list_del_init (&dum->ep [0].ep.ep_list);
796 INIT_LIST_HEAD(&dum->fifo_req.queue);
798 dum->driver = driver;
799 dum->gadget.dev.driver = &driver->driver;
800 dev_dbg (udc_dev(dum), "binding gadget driver '%s'\n",
801 driver->driver.name);
802 if ((retval = driver->bind (&dum->gadget)) != 0) {
804 dum->gadget.dev.driver = NULL;
808 driver->driver.bus = dum->gadget.dev.parent->bus;
809 driver_register (&driver->driver);
810 device_bind_driver (&dum->gadget.dev);
812 /* khubd will enumerate this in a while */
813 spin_lock_irq (&dum->lock);
815 set_link_state (dum);
816 spin_unlock_irq (&dum->lock);
818 usb_hcd_poll_rh_status (dummy_to_hcd (dum));
821 EXPORT_SYMBOL (usb_gadget_register_driver);
824 usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
826 struct dummy *dum = the_controller;
831 if (!driver || driver != dum->driver)
834 dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n",
835 driver->driver.name);
837 spin_lock_irqsave (&dum->lock, flags);
839 set_link_state (dum);
840 spin_unlock_irqrestore (&dum->lock, flags);
842 driver->unbind (&dum->gadget);
845 device_release_driver (&dum->gadget.dev);
846 driver_unregister (&driver->driver);
848 spin_lock_irqsave (&dum->lock, flags);
850 set_link_state (dum);
851 spin_unlock_irqrestore (&dum->lock, flags);
853 usb_hcd_poll_rh_status (dummy_to_hcd (dum));
856 EXPORT_SYMBOL (usb_gadget_unregister_driver);
860 /* just declare this in any driver that really need it */
861 extern int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode);
863 int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
867 EXPORT_SYMBOL (net2280_set_fifo_mode);
870 /* The gadget structure is stored inside the hcd structure and will be
871 * released along with it. */
873 dummy_gadget_release (struct device *dev)
875 #if 0 /* usb_bus_put isn't EXPORTed! */
876 struct dummy *dum = gadget_dev_to_dummy (dev);
878 usb_bus_put (&dummy_to_hcd (dum)->self);
882 static int dummy_udc_probe (struct device *dev)
884 struct dummy *dum = the_controller;
887 dum->gadget.name = gadget_name;
888 dum->gadget.ops = &dummy_ops;
889 dum->gadget.is_dualspeed = 1;
891 /* maybe claim OTG support, though we won't complete HNP */
892 dum->gadget.is_otg = (dummy_to_hcd(dum)->self.otg_port != 0);
894 strcpy (dum->gadget.dev.bus_id, "gadget");
895 dum->gadget.dev.parent = dev;
896 dum->gadget.dev.release = dummy_gadget_release;
897 rc = device_register (&dum->gadget.dev);
901 #if 0 /* usb_bus_get isn't EXPORTed! */
902 usb_bus_get (&dummy_to_hcd (dum)->self);
905 dev_set_drvdata (dev, dum);
906 device_create_file (&dum->gadget.dev, &dev_attr_function);
910 static int dummy_udc_remove (struct device *dev)
912 struct dummy *dum = dev_get_drvdata (dev);
914 dev_set_drvdata (dev, NULL);
915 device_remove_file (&dum->gadget.dev, &dev_attr_function);
916 device_unregister (&dum->gadget.dev);
920 static struct device_driver dummy_udc_driver = {
921 .name = (char *) gadget_name,
922 .bus = &platform_bus_type,
923 .probe = dummy_udc_probe,
924 .remove = dummy_udc_remove,
927 /*-------------------------------------------------------------------------*/
929 /* MASTER/HOST SIDE DRIVER
931 * this uses the hcd framework to hook up to host side drivers.
932 * its root hub will only have one device, otherwise it acts like
933 * a normal host controller.
935 * when urbs are queued, they're just stuck on a list that we
936 * scan in a timer callback. that callback connects writes from
937 * the host with reads from the device, and so on, based on the
941 static int dummy_urb_enqueue (
943 struct usb_host_endpoint *ep,
951 if (!urb->transfer_buffer && urb->transfer_buffer_length)
954 urbp = kmalloc (sizeof *urbp, mem_flags);
959 dum = hcd_to_dummy (hcd);
960 spin_lock_irqsave (&dum->lock, flags);
963 dum->udev = urb->dev;
964 usb_get_dev (dum->udev);
965 } else if (unlikely (dum->udev != urb->dev))
966 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
968 list_add_tail (&urbp->urbp_list, &dum->urbp_list);
970 if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
971 urb->error_count = 1; /* mark as a new urb */
973 /* kick the scheduler, it'll do the rest */
974 if (!timer_pending (&dum->timer))
975 mod_timer (&dum->timer, jiffies + 1);
977 spin_unlock_irqrestore (&dum->lock, flags);
981 static int dummy_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
983 /* giveback happens automatically in timer callback */
987 static void maybe_set_status (struct urb *urb, int status)
989 spin_lock (&urb->lock);
990 if (urb->status == -EINPROGRESS)
991 urb->status = status;
992 spin_unlock (&urb->lock);
995 /* transfer up to a frame's worth; caller must own lock */
997 transfer (struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit)
999 struct dummy_request *req;
1002 /* if there's no request queued, the device is NAKing; return */
1003 list_for_each_entry (req, &ep->queue, queue) {
1004 unsigned host_len, dev_len, len;
1005 int is_short, to_host;
1008 /* 1..N packets of ep->ep.maxpacket each ... the last one
1009 * may be short (including zero length).
1011 * writer can send a zlp explicitly (length 0) or implicitly
1012 * (length mod maxpacket zero, and 'zero' flag); they always
1015 host_len = urb->transfer_buffer_length - urb->actual_length;
1016 dev_len = req->req.length - req->req.actual;
1017 len = min (host_len, dev_len);
1019 /* FIXME update emulated data toggle too */
1021 to_host = usb_pipein (urb->pipe);
1022 if (unlikely (len == 0))
1027 /* not enough bandwidth left? */
1028 if (limit < ep->ep.maxpacket && limit < len)
1030 len = min (len, (unsigned) limit);
1034 /* use an extra pass for the final short packet */
1035 if (len > ep->ep.maxpacket) {
1037 len -= (len % ep->ep.maxpacket);
1039 is_short = (len % ep->ep.maxpacket) != 0;
1041 /* else transfer packet(s) */
1042 ubuf = urb->transfer_buffer + urb->actual_length;
1043 rbuf = req->req.buf + req->req.actual;
1045 memcpy (ubuf, rbuf, len);
1047 memcpy (rbuf, ubuf, len);
1048 ep->last_io = jiffies;
1051 urb->actual_length += len;
1052 req->req.actual += len;
1055 /* short packets terminate, maybe with overflow/underflow.
1056 * it's only really an error to write too much.
1058 * partially filling a buffer optionally blocks queue advances
1059 * (so completion handlers can clean up the queue) but we don't
1060 * need to emulate such data-in-flight. so we only show part
1061 * of the URB_SHORT_NOT_OK effect: completion status.
1064 if (host_len == dev_len) {
1065 req->req.status = 0;
1066 maybe_set_status (urb, 0);
1067 } else if (to_host) {
1068 req->req.status = 0;
1069 if (dev_len > host_len)
1070 maybe_set_status (urb, -EOVERFLOW);
1072 maybe_set_status (urb,
1073 (urb->transfer_flags
1076 } else if (!to_host) {
1077 maybe_set_status (urb, 0);
1078 if (host_len > dev_len)
1079 req->req.status = -EOVERFLOW;
1081 req->req.status = 0;
1084 /* many requests terminate without a short packet */
1086 if (req->req.length == req->req.actual
1088 req->req.status = 0;
1089 if (urb->transfer_buffer_length == urb->actual_length
1090 && !(urb->transfer_flags
1091 & URB_ZERO_PACKET)) {
1092 maybe_set_status (urb, 0);
1096 /* device side completion --> continuable */
1097 if (req->req.status != -EINPROGRESS) {
1098 list_del_init (&req->queue);
1100 spin_unlock (&dum->lock);
1101 req->req.complete (&ep->ep, &req->req);
1102 spin_lock (&dum->lock);
1104 /* requests might have been unlinked... */
1108 /* host side completion --> terminate */
1109 if (urb->status != -EINPROGRESS)
1112 /* rescan to continue with any other queued i/o */
1119 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1121 int limit = ep->ep.maxpacket;
1123 if (dum->gadget.speed == USB_SPEED_HIGH) {
1126 /* high bandwidth mode */
1127 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1128 tmp = (tmp >> 11) & 0x03;
1129 tmp *= 8 /* applies to entire frame */;
1130 limit += limit * tmp;
1135 #define is_active(dum) ((dum->port_status & \
1136 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1137 USB_PORT_STAT_SUSPEND)) \
1138 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1140 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1144 if (!is_active (dum))
1146 if ((address & ~USB_DIR_IN) == 0)
1147 return &dum->ep [0];
1148 for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1149 struct dummy_ep *ep = &dum->ep [i];
1153 if (ep->desc->bEndpointAddress == address)
1161 #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1162 #define Dev_InRequest (Dev_Request | USB_DIR_IN)
1163 #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1164 #define Intf_InRequest (Intf_Request | USB_DIR_IN)
1165 #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1166 #define Ep_InRequest (Ep_Request | USB_DIR_IN)
1168 /* drive both sides of the transfers; looks like irq handlers to
1169 * both drivers except the callbacks aren't in_irq().
1171 static void dummy_timer (unsigned long _dum)
1173 struct dummy *dum = (struct dummy *) _dum;
1174 struct urbp *urbp, *tmp;
1175 unsigned long flags;
1179 /* simplistic model for one frame's bandwidth */
1180 switch (dum->gadget.speed) {
1182 total = 8/*bytes*/ * 12/*packets*/;
1184 case USB_SPEED_FULL:
1185 total = 64/*bytes*/ * 19/*packets*/;
1187 case USB_SPEED_HIGH:
1188 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1191 dev_err (dummy_dev(dum), "bogus device speed\n");
1195 /* FIXME if HZ != 1000 this will probably misbehave ... */
1197 /* look at each urb queued by the host side driver */
1198 spin_lock_irqsave (&dum->lock, flags);
1201 dev_err (dummy_dev(dum),
1202 "timer fired with no URBs pending?\n");
1203 spin_unlock_irqrestore (&dum->lock, flags);
1207 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1210 dum->ep [i].already_seen = 0;
1214 list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1216 struct dummy_request *req;
1218 struct dummy_ep *ep = NULL;
1222 if (urb->status != -EINPROGRESS) {
1223 /* likely it was just unlinked */
1226 type = usb_pipetype (urb->pipe);
1228 /* used up this frame's non-periodic bandwidth?
1229 * FIXME there's infinite bandwidth for control and
1230 * periodic transfers ... unrealistic.
1232 if (total <= 0 && type == PIPE_BULK)
1235 /* find the gadget's ep for this request (if configured) */
1236 address = usb_pipeendpoint (urb->pipe);
1237 if (usb_pipein (urb->pipe))
1238 address |= USB_DIR_IN;
1239 ep = find_endpoint(dum, address);
1241 /* set_configuration() disagreement */
1242 dev_dbg (dummy_dev(dum),
1243 "no ep configured for urb %p\n",
1245 maybe_set_status (urb, -EPROTO);
1249 if (ep->already_seen)
1251 ep->already_seen = 1;
1252 if (ep == &dum->ep [0] && urb->error_count) {
1253 ep->setup_stage = 1; /* a new urb */
1254 urb->error_count = 0;
1256 if (ep->halted && !ep->setup_stage) {
1257 /* NOTE: must not be iso! */
1258 dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1260 maybe_set_status (urb, -EPIPE);
1263 /* FIXME make sure both ends agree on maxpacket */
1265 /* handle control requests */
1266 if (ep == &dum->ep [0] && ep->setup_stage) {
1267 struct usb_ctrlrequest setup;
1269 struct dummy_ep *ep2;
1273 setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1274 w_index = le16_to_cpu(setup.wIndex);
1275 w_value = le16_to_cpu(setup.wValue);
1276 if (le16_to_cpu(setup.wLength) !=
1277 urb->transfer_buffer_length) {
1278 maybe_set_status (urb, -EOVERFLOW);
1282 /* paranoia, in case of stale queued data */
1283 list_for_each_entry (req, &ep->queue, queue) {
1284 list_del_init (&req->queue);
1285 req->req.status = -EOVERFLOW;
1286 dev_dbg (udc_dev(dum), "stale req = %p\n",
1289 spin_unlock (&dum->lock);
1290 req->req.complete (&ep->ep, &req->req);
1291 spin_lock (&dum->lock);
1292 ep->already_seen = 0;
1296 /* gadget driver never sees set_address or operations
1297 * on standard feature flags. some hardware doesn't
1300 ep->last_io = jiffies;
1301 ep->setup_stage = 0;
1303 switch (setup.bRequest) {
1304 case USB_REQ_SET_ADDRESS:
1305 if (setup.bRequestType != Dev_Request)
1307 dum->address = w_value;
1308 maybe_set_status (urb, 0);
1309 dev_dbg (udc_dev(dum), "set_address = %d\n",
1313 case USB_REQ_SET_FEATURE:
1314 if (setup.bRequestType == Dev_Request) {
1317 case USB_DEVICE_REMOTE_WAKEUP:
1319 case USB_DEVICE_B_HNP_ENABLE:
1320 dum->gadget.b_hnp_enable = 1;
1322 case USB_DEVICE_A_HNP_SUPPORT:
1323 dum->gadget.a_hnp_support = 1;
1325 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1326 dum->gadget.a_alt_hnp_support
1330 value = -EOPNOTSUPP;
1335 maybe_set_status (urb, 0);
1338 } else if (setup.bRequestType == Ep_Request) {
1340 ep2 = find_endpoint (dum, w_index);
1342 value = -EOPNOTSUPP;
1347 maybe_set_status (urb, 0);
1350 case USB_REQ_CLEAR_FEATURE:
1351 if (setup.bRequestType == Dev_Request) {
1353 case USB_DEVICE_REMOTE_WAKEUP:
1354 dum->devstatus &= ~(1 <<
1355 USB_DEVICE_REMOTE_WAKEUP);
1357 maybe_set_status (urb, 0);
1360 value = -EOPNOTSUPP;
1363 } else if (setup.bRequestType == Ep_Request) {
1365 ep2 = find_endpoint (dum, w_index);
1367 value = -EOPNOTSUPP;
1372 maybe_set_status (urb, 0);
1375 case USB_REQ_GET_STATUS:
1376 if (setup.bRequestType == Dev_InRequest
1377 || setup.bRequestType
1379 || setup.bRequestType
1384 // device: remote wakeup, selfpowered
1385 // interface: nothing
1387 buf = (char *)urb->transfer_buffer;
1388 if (urb->transfer_buffer_length > 0) {
1389 if (setup.bRequestType ==
1391 ep2 = find_endpoint (dum, w_index);
1393 value = -EOPNOTSUPP;
1396 buf [0] = ep2->halted;
1397 } else if (setup.bRequestType ==
1404 if (urb->transfer_buffer_length > 1)
1406 urb->actual_length = min (2,
1407 urb->transfer_buffer_length);
1409 maybe_set_status (urb, 0);
1414 /* gadget driver handles all other requests. block
1415 * until setup() returns; no reentrancy issues etc.
1418 spin_unlock (&dum->lock);
1419 value = dum->driver->setup (&dum->gadget,
1421 spin_lock (&dum->lock);
1424 /* no delays (max 64KB data stage) */
1426 goto treat_control_like_bulk;
1428 /* error, see below */
1432 if (value != -EOPNOTSUPP)
1433 dev_dbg (udc_dev(dum),
1436 maybe_set_status (urb, -EPIPE);
1437 urb->actual_length = 0;
1443 /* non-control requests */
1445 switch (usb_pipetype (urb->pipe)) {
1446 case PIPE_ISOCHRONOUS:
1447 /* FIXME is it urb->interval since the last xfer?
1448 * use urb->iso_frame_desc[i].
1449 * complete whether or not ep has requests queued.
1450 * report random errors, to debug drivers.
1452 limit = max (limit, periodic_bytes (dum, ep));
1453 maybe_set_status (urb, -ENOSYS);
1456 case PIPE_INTERRUPT:
1457 /* FIXME is it urb->interval since the last xfer?
1458 * this almost certainly polls too fast.
1460 limit = max (limit, periodic_bytes (dum, ep));
1463 // case PIPE_BULK: case PIPE_CONTROL:
1465 treat_control_like_bulk:
1466 ep->last_io = jiffies;
1467 total = transfer (dum, urb, ep, limit);
1471 /* incomplete transfer? */
1472 if (urb->status == -EINPROGRESS)
1477 list_del (&urbp->urbp_list);
1480 ep->already_seen = ep->setup_stage = 0;
1482 spin_unlock (&dum->lock);
1483 usb_hcd_giveback_urb (dummy_to_hcd(dum), urb, NULL);
1484 spin_lock (&dum->lock);
1489 /* want a 1 msec delay here */
1490 if (!list_empty (&dum->urbp_list))
1491 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1493 usb_put_dev (dum->udev);
1497 spin_unlock_irqrestore (&dum->lock, flags);
1500 /*-------------------------------------------------------------------------*/
1502 #define PORT_C_MASK \
1503 ((USB_PORT_STAT_C_CONNECTION \
1504 | USB_PORT_STAT_C_ENABLE \
1505 | USB_PORT_STAT_C_SUSPEND \
1506 | USB_PORT_STAT_C_OVERCURRENT \
1507 | USB_PORT_STAT_C_RESET) << 16)
1509 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1512 unsigned long flags;
1515 dum = hcd_to_dummy (hcd);
1517 spin_lock_irqsave (&dum->lock, flags);
1519 if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) {
1520 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1521 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1522 set_link_state (dum);
1525 if (!(dum->port_status & PORT_C_MASK))
1529 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1533 spin_unlock_irqrestore (&dum->lock, flags);
1538 hub_descriptor (struct usb_hub_descriptor *desc)
1540 memset (desc, 0, sizeof *desc);
1541 desc->bDescriptorType = 0x29;
1542 desc->bDescLength = 9;
1543 desc->wHubCharacteristics = (__force __u16)
1544 (__constant_cpu_to_le16 (0x0001));
1545 desc->bNbrPorts = 1;
1546 desc->bitmap [0] = 0xff;
1547 desc->bitmap [1] = 0xff;
1550 static int dummy_hub_control (
1551 struct usb_hcd *hcd,
1560 unsigned long flags;
1562 dum = hcd_to_dummy (hcd);
1563 spin_lock_irqsave (&dum->lock, flags);
1565 case ClearHubFeature:
1567 case ClearPortFeature:
1569 case USB_PORT_FEAT_SUSPEND:
1570 if (dum->port_status & USB_PORT_STAT_SUSPEND) {
1571 /* 20msec resume signaling */
1573 dum->re_timeout = jiffies +
1574 msecs_to_jiffies(20);
1577 case USB_PORT_FEAT_POWER:
1578 if (dum->port_status & USB_PORT_STAT_POWER)
1579 dev_dbg (dummy_dev(dum), "power-off\n");
1582 dum->port_status &= ~(1 << wValue);
1583 set_link_state (dum);
1586 case GetHubDescriptor:
1587 hub_descriptor ((struct usb_hub_descriptor *) buf);
1590 *(__le32 *) buf = __constant_cpu_to_le32 (0);
1596 /* whoever resets or resumes must GetPortStatus to
1599 if (dum->resuming &&
1600 time_after_eq (jiffies, dum->re_timeout)) {
1601 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1602 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1604 if ((dum->port_status & USB_PORT_STAT_RESET) != 0 &&
1605 time_after_eq (jiffies, dum->re_timeout)) {
1606 dum->port_status |= (USB_PORT_STAT_C_RESET << 16);
1607 dum->port_status &= ~USB_PORT_STAT_RESET;
1609 dum->port_status |= USB_PORT_STAT_ENABLE;
1610 /* give it the best speed we agree on */
1611 dum->gadget.speed = dum->driver->speed;
1612 dum->gadget.ep0->maxpacket = 64;
1613 switch (dum->gadget.speed) {
1614 case USB_SPEED_HIGH:
1616 USB_PORT_STAT_HIGH_SPEED;
1619 dum->gadget.ep0->maxpacket = 8;
1621 USB_PORT_STAT_LOW_SPEED;
1624 dum->gadget.speed = USB_SPEED_FULL;
1629 set_link_state (dum);
1630 ((__le16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1631 ((__le16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1636 case SetPortFeature:
1638 case USB_PORT_FEAT_SUSPEND:
1640 dum->port_status |= USB_PORT_STAT_SUSPEND;
1642 /* HNP would happen here; for now we
1643 * assume b_bus_req is always true.
1645 set_link_state (dum);
1646 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1647 & dum->devstatus) != 0)
1648 dev_dbg (dummy_dev(dum),
1652 case USB_PORT_FEAT_POWER:
1653 dum->port_status |= USB_PORT_STAT_POWER;
1654 set_link_state (dum);
1656 case USB_PORT_FEAT_RESET:
1657 /* if it's already enabled, disable */
1658 dum->port_status &= ~(USB_PORT_STAT_ENABLE
1659 | USB_PORT_STAT_LOW_SPEED
1660 | USB_PORT_STAT_HIGH_SPEED);
1661 /* 50msec reset signaling */
1662 dum->re_timeout = jiffies + msecs_to_jiffies(50);
1665 if ((dum->port_status & USB_PORT_STAT_POWER) != 0) {
1666 dum->port_status |= (1 << wValue);
1667 set_link_state (dum);
1673 dev_dbg (dummy_dev(dum),
1674 "hub control req%04x v%04x i%04x l%d\n",
1675 typeReq, wValue, wIndex, wLength);
1677 /* "protocol stall" on error */
1680 spin_unlock_irqrestore (&dum->lock, flags);
1682 if ((dum->port_status & PORT_C_MASK) != 0)
1683 usb_hcd_poll_rh_status (hcd);
1688 /*-------------------------------------------------------------------------*/
1690 static inline ssize_t
1691 show_urb (char *buf, size_t size, struct urb *urb)
1693 int ep = usb_pipeendpoint (urb->pipe);
1695 return snprintf (buf, size,
1696 "urb/%p %s ep%d%s%s len %d/%d\n",
1699 switch (urb->dev->speed) {
1700 case USB_SPEED_LOW: s = "ls"; break;
1701 case USB_SPEED_FULL: s = "fs"; break;
1702 case USB_SPEED_HIGH: s = "hs"; break;
1703 default: s = "?"; break;
1705 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1707 switch (usb_pipetype (urb->pipe)) { \
1708 case PIPE_CONTROL: s = ""; break; \
1709 case PIPE_BULK: s = "-bulk"; break; \
1710 case PIPE_INTERRUPT: s = "-int"; break; \
1711 default: s = "-iso"; break; \
1713 urb->actual_length, urb->transfer_buffer_length);
1717 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
1719 struct usb_hcd *hcd = dev_get_drvdata (dev);
1720 struct dummy *dum = hcd_to_dummy (hcd);
1723 unsigned long flags;
1725 spin_lock_irqsave (&dum->lock, flags);
1726 list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1729 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1733 spin_unlock_irqrestore (&dum->lock, flags);
1737 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1739 static int dummy_start (struct usb_hcd *hcd)
1743 dum = hcd_to_dummy (hcd);
1746 * MASTER side init ... we emulate a root hub that'll only ever
1747 * talk to one device (the slave side). Also appears in sysfs,
1748 * just like more familiar pci-based HCDs.
1750 spin_lock_init (&dum->lock);
1751 init_timer (&dum->timer);
1752 dum->timer.function = dummy_timer;
1753 dum->timer.data = (unsigned long) dum;
1755 INIT_LIST_HEAD (&dum->urbp_list);
1757 /* only show a low-power port: just 8mA */
1758 hcd->power_budget = 8;
1759 hcd->state = HC_STATE_RUNNING;
1760 hcd->uses_new_polling = 1;
1762 #ifdef CONFIG_USB_OTG
1763 hcd->self.otg_port = 1;
1766 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1767 device_create_file (dummy_dev(dum), &dev_attr_urbs);
1771 static void dummy_stop (struct usb_hcd *hcd)
1775 dum = hcd_to_dummy (hcd);
1777 device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1778 usb_gadget_unregister_driver (dum->driver);
1779 dev_info (dummy_dev(dum), "stopped\n");
1782 /*-------------------------------------------------------------------------*/
1784 static int dummy_h_get_frame (struct usb_hcd *hcd)
1786 return dummy_g_get_frame (NULL);
1789 static const struct hc_driver dummy_hcd = {
1790 .description = (char *) driver_name,
1791 .product_desc = "Dummy host controller",
1792 .hcd_priv_size = sizeof(struct dummy),
1796 .start = dummy_start,
1799 .urb_enqueue = dummy_urb_enqueue,
1800 .urb_dequeue = dummy_urb_dequeue,
1802 .get_frame_number = dummy_h_get_frame,
1804 .hub_status_data = dummy_hub_status,
1805 .hub_control = dummy_hub_control,
1808 static int dummy_hcd_probe (struct device *dev)
1810 struct usb_hcd *hcd;
1813 dev_info (dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1815 hcd = usb_create_hcd (&dummy_hcd, dev, dev->bus_id);
1818 the_controller = hcd_to_dummy (hcd);
1820 retval = usb_add_hcd(hcd, 0, 0);
1823 the_controller = NULL;
1828 static int dummy_hcd_remove (struct device *dev)
1830 struct usb_hcd *hcd;
1832 hcd = dev_get_drvdata (dev);
1833 usb_remove_hcd (hcd);
1835 the_controller = NULL;
1839 static struct device_driver dummy_hcd_driver = {
1840 .name = (char *) driver_name,
1841 .bus = &platform_bus_type,
1842 .probe = dummy_hcd_probe,
1843 .remove = dummy_hcd_remove,
1846 /*-------------------------------------------------------------------------*/
1848 /* These don't need to do anything because the pdev structures are
1849 * statically allocated. */
1851 dummy_udc_release (struct device *dev) {}
1854 dummy_hcd_release (struct device *dev) {}
1856 static struct platform_device the_udc_pdev = {
1857 .name = (char *) gadget_name,
1860 .release = dummy_udc_release,
1864 static struct platform_device the_hcd_pdev = {
1865 .name = (char *) driver_name,
1868 .release = dummy_hcd_release,
1872 static int __init init (void)
1876 if (usb_disabled ())
1879 retval = driver_register (&dummy_hcd_driver);
1883 retval = driver_register (&dummy_udc_driver);
1885 goto err_register_udc_driver;
1887 retval = platform_device_register (&the_hcd_pdev);
1889 goto err_register_hcd;
1891 retval = platform_device_register (&the_udc_pdev);
1893 goto err_register_udc;
1897 platform_device_unregister (&the_hcd_pdev);
1899 driver_unregister (&dummy_udc_driver);
1900 err_register_udc_driver:
1901 driver_unregister (&dummy_hcd_driver);
1906 static void __exit cleanup (void)
1908 platform_device_unregister (&the_udc_pdev);
1909 platform_device_unregister (&the_hcd_pdev);
1910 driver_unregister (&dummy_udc_driver);
1911 driver_unregister (&dummy_hcd_driver);
1913 module_exit (cleanup);