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/module.h>
40 #include <linux/kernel.h>
41 #include <linux/delay.h>
42 #include <linux/ioport.h>
43 #include <linux/sched.h>
44 #include <linux/slab.h>
45 #include <linux/smp_lock.h>
46 #include <linux/errno.h>
47 #include <linux/init.h>
48 #include <linux/timer.h>
49 #include <linux/list.h>
50 #include <linux/interrupt.h>
51 #include <linux/platform_device.h>
52 #include <linux/usb.h>
53 #include <linux/usb_gadget.h>
55 #include <asm/byteorder.h>
58 #include <asm/system.h>
59 #include <asm/unaligned.h>
62 #include "../core/hcd.h"
65 #define DRIVER_DESC "USB Host+Gadget Emulator"
66 #define DRIVER_VERSION "02 May 2005"
68 static const char driver_name [] = "dummy_hcd";
69 static const char driver_desc [] = "USB Host+Gadget Emulator";
71 static const char gadget_name [] = "dummy_udc";
73 MODULE_DESCRIPTION (DRIVER_DESC);
74 MODULE_AUTHOR ("David Brownell");
75 MODULE_LICENSE ("GPL");
77 /*-------------------------------------------------------------------------*/
79 /* gadget side driver data structres */
81 struct list_head queue;
82 unsigned long last_io; /* jiffies timestamp */
83 struct usb_gadget *gadget;
84 const struct usb_endpoint_descriptor *desc;
87 unsigned already_seen : 1;
88 unsigned setup_stage : 1;
91 struct dummy_request {
92 struct list_head queue; /* ep's requests */
93 struct usb_request req;
96 static inline struct dummy_ep *usb_ep_to_dummy_ep (struct usb_ep *_ep)
98 return container_of (_ep, struct dummy_ep, ep);
101 static inline struct dummy_request *usb_request_to_dummy_request
102 (struct usb_request *_req)
104 return container_of (_req, struct dummy_request, req);
107 /*-------------------------------------------------------------------------*/
110 * Every device has ep0 for control requests, plus up to 30 more endpoints,
111 * in one of two types:
113 * - Configurable: direction (in/out), type (bulk, iso, etc), and endpoint
114 * number can be changed. Names like "ep-a" are used for this type.
116 * - Fixed Function: in other cases. some characteristics may be mutable;
117 * that'd be hardware-specific. Names like "ep12out-bulk" are used.
119 * Gadget drivers are responsible for not setting up conflicting endpoint
120 * configurations, illegal or unsupported packet lengths, and so on.
123 static const char ep0name [] = "ep0";
125 static const char *const ep_name [] = {
126 ep0name, /* everyone has ep0 */
128 /* act like a net2280: high speed, six configurable endpoints */
129 "ep-a", "ep-b", "ep-c", "ep-d", "ep-e", "ep-f",
131 /* or like pxa250: fifteen fixed function endpoints */
132 "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
133 "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
134 "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
137 /* or like sa1100: two fixed function endpoints */
138 "ep1out-bulk", "ep2in-bulk",
140 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_name)
142 /*-------------------------------------------------------------------------*/
148 struct list_head urbp_list;
152 enum dummy_rh_state {
162 * SLAVE/GADGET side support
164 struct dummy_ep ep [DUMMY_ENDPOINTS];
166 struct usb_gadget gadget;
167 struct usb_gadget_driver *driver;
168 struct dummy_request fifo_req;
169 u8 fifo_buf [FIFO_SIZE];
171 unsigned udc_suspended:1;
174 unsigned old_active:1;
177 * MASTER/HOST side support
179 enum dummy_rh_state rh_state;
180 struct timer_list timer;
184 unsigned long re_timeout;
186 struct usb_device *udev;
187 struct list_head urbp_list;
190 static inline struct dummy *hcd_to_dummy (struct usb_hcd *hcd)
192 return (struct dummy *) (hcd->hcd_priv);
195 static inline struct usb_hcd *dummy_to_hcd (struct dummy *dum)
197 return container_of((void *) dum, struct usb_hcd, hcd_priv);
200 static inline struct device *dummy_dev (struct dummy *dum)
202 return dummy_to_hcd(dum)->self.controller;
205 static inline struct device *udc_dev (struct dummy *dum)
207 return dum->gadget.dev.parent;
210 static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
212 return container_of (ep->gadget, struct dummy, gadget);
215 static inline struct dummy *gadget_to_dummy (struct usb_gadget *gadget)
217 return container_of (gadget, struct dummy, gadget);
220 static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
222 return container_of (dev, struct dummy, gadget.dev);
225 static struct dummy *the_controller;
227 /*-------------------------------------------------------------------------*/
229 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
231 /* called with spinlock held */
232 static void nuke (struct dummy *dum, struct dummy_ep *ep)
234 while (!list_empty (&ep->queue)) {
235 struct dummy_request *req;
237 req = list_entry (ep->queue.next, struct dummy_request, queue);
238 list_del_init (&req->queue);
239 req->req.status = -ESHUTDOWN;
241 spin_unlock (&dum->lock);
242 req->req.complete (&ep->ep, &req->req);
243 spin_lock (&dum->lock);
247 /* caller must hold lock */
249 stop_activity (struct dummy *dum)
253 /* prevent any more requests */
256 /* The timer is left running so that outstanding URBs can fail */
258 /* nuke any pending requests first, so driver i/o is quiesced */
259 list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
262 /* driver now does any non-usb quiescing necessary */
265 /* caller must hold lock */
267 set_link_state (struct dummy *dum)
270 if ((dum->port_status & USB_PORT_STAT_POWER) == 0)
271 dum->port_status = 0;
273 /* UDC suspend must cause a disconnect */
274 else if (!dum->pullup || dum->udc_suspended) {
275 dum->port_status &= ~(USB_PORT_STAT_CONNECTION |
276 USB_PORT_STAT_ENABLE |
277 USB_PORT_STAT_LOW_SPEED |
278 USB_PORT_STAT_HIGH_SPEED |
279 USB_PORT_STAT_SUSPEND);
280 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0)
281 dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
283 dum->port_status |= USB_PORT_STAT_CONNECTION;
284 if ((dum->old_status & USB_PORT_STAT_CONNECTION) == 0)
285 dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
286 if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0)
287 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
288 else if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
289 dum->rh_state != DUMMY_RH_SUSPENDED)
293 if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0 || dum->active)
296 if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
297 (dum->port_status & USB_PORT_STAT_RESET) != 0) {
298 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0 &&
299 (dum->old_status & USB_PORT_STAT_RESET) == 0 &&
302 spin_unlock (&dum->lock);
303 dum->driver->disconnect (&dum->gadget);
304 spin_lock (&dum->lock);
306 } else if (dum->active != dum->old_active) {
307 if (dum->old_active && dum->driver->suspend) {
308 spin_unlock (&dum->lock);
309 dum->driver->suspend (&dum->gadget);
310 spin_lock (&dum->lock);
311 } else if (!dum->old_active && dum->driver->resume) {
312 spin_unlock (&dum->lock);
313 dum->driver->resume (&dum->gadget);
314 spin_lock (&dum->lock);
318 dum->old_status = dum->port_status;
319 dum->old_active = dum->active;
322 /*-------------------------------------------------------------------------*/
324 /* SLAVE/GADGET SIDE DRIVER
326 * This only tracks gadget state. All the work is done when the host
327 * side tries some (emulated) i/o operation. Real device controller
328 * drivers would do real i/o using dma, fifos, irqs, timers, etc.
331 #define is_enabled(dum) \
332 (dum->port_status & USB_PORT_STAT_ENABLE)
335 dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
342 ep = usb_ep_to_dummy_ep (_ep);
343 if (!_ep || !desc || ep->desc || _ep->name == ep0name
344 || desc->bDescriptorType != USB_DT_ENDPOINT)
346 dum = ep_to_dummy (ep);
347 if (!dum->driver || !is_enabled (dum))
349 max = le16_to_cpu(desc->wMaxPacketSize) & 0x3ff;
351 /* drivers must not request bad settings, since lower levels
352 * (hardware or its drivers) may not check. some endpoints
353 * can't do iso, many have maxpacket limitations, etc.
355 * since this "hardware" driver is here to help debugging, we
356 * have some extra sanity checks. (there could be more though,
357 * especially for "ep9out" style fixed function ones.)
360 switch (desc->bmAttributes & 0x03) {
361 case USB_ENDPOINT_XFER_BULK:
362 if (strstr (ep->ep.name, "-iso")
363 || strstr (ep->ep.name, "-int")) {
366 switch (dum->gadget.speed) {
370 /* conserve return statements */
373 case 8: case 16: case 32: case 64:
374 /* we'll fake any legal size */
382 case USB_ENDPOINT_XFER_INT:
383 if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
385 /* real hardware might not handle all packet sizes */
386 switch (dum->gadget.speed) {
390 /* save a return statement */
394 /* save a return statement */
401 case USB_ENDPOINT_XFER_ISOC:
402 if (strstr (ep->ep.name, "-bulk")
403 || strstr (ep->ep.name, "-int"))
405 /* real hardware might not handle all packet sizes */
406 switch (dum->gadget.speed) {
410 /* save a return statement */
414 /* save a return statement */
420 /* few chips support control except on ep0 */
424 _ep->maxpacket = max;
427 dev_dbg (udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
429 desc->bEndpointAddress & 0x0f,
430 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
432 switch (desc->bmAttributes & 0x03) {
433 case USB_ENDPOINT_XFER_BULK: val = "bulk"; break;
434 case USB_ENDPOINT_XFER_ISOC: val = "iso"; break;
435 case USB_ENDPOINT_XFER_INT: val = "intr"; break;
436 default: val = "ctrl"; break;
440 /* at this point real hardware should be NAKing transfers
441 * to that endpoint, until a buffer is queued to it.
448 static int dummy_disable (struct usb_ep *_ep)
455 ep = usb_ep_to_dummy_ep (_ep);
456 if (!_ep || !ep->desc || _ep->name == ep0name)
458 dum = ep_to_dummy (ep);
460 spin_lock_irqsave (&dum->lock, flags);
464 spin_unlock_irqrestore (&dum->lock, flags);
466 dev_dbg (udc_dev(dum), "disabled %s\n", _ep->name);
470 static struct usb_request *
471 dummy_alloc_request (struct usb_ep *_ep, gfp_t mem_flags)
474 struct dummy_request *req;
478 ep = usb_ep_to_dummy_ep (_ep);
480 req = kzalloc(sizeof(*req), mem_flags);
483 INIT_LIST_HEAD (&req->queue);
488 dummy_free_request (struct usb_ep *_ep, struct usb_request *_req)
491 struct dummy_request *req;
493 ep = usb_ep_to_dummy_ep (_ep);
494 if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
497 req = usb_request_to_dummy_request (_req);
498 WARN_ON (!list_empty (&req->queue));
513 ep = usb_ep_to_dummy_ep (_ep);
514 dum = ep_to_dummy (ep);
518 retval = kmalloc (bytes, mem_flags);
519 *dma = (dma_addr_t) retval;
535 fifo_complete (struct usb_ep *ep, struct usb_request *req)
540 dummy_queue (struct usb_ep *_ep, struct usb_request *_req,
544 struct dummy_request *req;
548 req = usb_request_to_dummy_request (_req);
549 if (!_req || !list_empty (&req->queue) || !_req->complete)
552 ep = usb_ep_to_dummy_ep (_ep);
553 if (!_ep || (!ep->desc && _ep->name != ep0name))
556 dum = ep_to_dummy (ep);
557 if (!dum->driver || !is_enabled (dum))
561 dev_dbg (udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
562 ep, _req, _ep->name, _req->length, _req->buf);
565 _req->status = -EINPROGRESS;
567 spin_lock_irqsave (&dum->lock, flags);
569 /* implement an emulated single-request FIFO */
570 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
571 list_empty (&dum->fifo_req.queue) &&
572 list_empty (&ep->queue) &&
573 _req->length <= FIFO_SIZE) {
574 req = &dum->fifo_req;
576 req->req.buf = dum->fifo_buf;
577 memcpy (dum->fifo_buf, _req->buf, _req->length);
578 req->req.context = dum;
579 req->req.complete = fifo_complete;
581 spin_unlock (&dum->lock);
582 _req->actual = _req->length;
584 _req->complete (_ep, _req);
585 spin_lock (&dum->lock);
587 list_add_tail (&req->queue, &ep->queue);
588 spin_unlock_irqrestore (&dum->lock, flags);
590 /* real hardware would likely enable transfers here, in case
591 * it'd been left NAKing.
596 static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
600 int retval = -EINVAL;
602 struct dummy_request *req = NULL;
606 ep = usb_ep_to_dummy_ep (_ep);
607 dum = ep_to_dummy (ep);
612 spin_lock_irqsave (&dum->lock, flags);
613 list_for_each_entry (req, &ep->queue, queue) {
614 if (&req->req == _req) {
615 list_del_init (&req->queue);
616 _req->status = -ECONNRESET;
621 spin_unlock_irqrestore (&dum->lock, flags);
624 dev_dbg (udc_dev(dum),
625 "dequeued req %p from %s, len %d buf %p\n",
626 req, _ep->name, _req->length, _req->buf);
627 _req->complete (_ep, _req);
633 dummy_set_halt (struct usb_ep *_ep, int value)
640 ep = usb_ep_to_dummy_ep (_ep);
641 dum = ep_to_dummy (ep);
646 else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
647 !list_empty (&ep->queue))
651 /* FIXME clear emulated data toggle too */
655 static const struct usb_ep_ops dummy_ep_ops = {
656 .enable = dummy_enable,
657 .disable = dummy_disable,
659 .alloc_request = dummy_alloc_request,
660 .free_request = dummy_free_request,
662 .alloc_buffer = dummy_alloc_buffer,
663 .free_buffer = dummy_free_buffer,
664 /* map, unmap, ... eventually hook the "generic" dma calls */
666 .queue = dummy_queue,
667 .dequeue = dummy_dequeue,
669 .set_halt = dummy_set_halt,
672 /*-------------------------------------------------------------------------*/
674 /* there are both host and device side versions of this call ... */
675 static int dummy_g_get_frame (struct usb_gadget *_gadget)
679 do_gettimeofday (&tv);
680 return tv.tv_usec / 1000;
683 static int dummy_wakeup (struct usb_gadget *_gadget)
687 dum = gadget_to_dummy (_gadget);
688 if (!(dum->devstatus & ( (1 << USB_DEVICE_B_HNP_ENABLE)
689 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
691 if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0)
693 if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
694 dum->rh_state != DUMMY_RH_SUSPENDED)
697 /* FIXME: What if the root hub is suspended but the port isn't? */
699 /* hub notices our request, issues downstream resume, etc */
701 dum->re_timeout = jiffies + msecs_to_jiffies(20);
702 mod_timer (&dummy_to_hcd (dum)->rh_timer, dum->re_timeout);
706 static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
710 dum = gadget_to_dummy (_gadget);
712 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
714 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
718 static int dummy_pullup (struct usb_gadget *_gadget, int value)
723 dum = gadget_to_dummy (_gadget);
724 spin_lock_irqsave (&dum->lock, flags);
725 dum->pullup = (value != 0);
726 set_link_state (dum);
727 spin_unlock_irqrestore (&dum->lock, flags);
729 usb_hcd_poll_rh_status (dummy_to_hcd (dum));
733 static const struct usb_gadget_ops dummy_ops = {
734 .get_frame = dummy_g_get_frame,
735 .wakeup = dummy_wakeup,
736 .set_selfpowered = dummy_set_selfpowered,
737 .pullup = dummy_pullup,
740 /*-------------------------------------------------------------------------*/
742 /* "function" sysfs attribute */
744 show_function (struct device *dev, struct device_attribute *attr, char *buf)
746 struct dummy *dum = gadget_dev_to_dummy (dev);
748 if (!dum->driver || !dum->driver->function)
750 return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
752 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
754 /*-------------------------------------------------------------------------*/
757 * Driver registration/unregistration.
759 * This is basically hardware-specific; there's usually only one real USB
760 * device (not host) controller since that's how USB devices are intended
761 * to work. So most implementations of these api calls will rely on the
762 * fact that only one driver will ever bind to the hardware. But curious
763 * hardware can be built with discrete components, so the gadget API doesn't
764 * require that assumption.
766 * For this emulator, it might be convenient to create a usb slave device
767 * for each driver that registers: just add to a big root hub.
771 usb_gadget_register_driver (struct usb_gadget_driver *driver)
773 struct dummy *dum = the_controller;
780 if (!driver->bind || !driver->unbind || !driver->setup
781 || driver->speed == USB_SPEED_UNKNOWN)
785 * SLAVE side init ... the layer above hardware, which
786 * can't enumerate without help from the driver we're binding.
791 INIT_LIST_HEAD (&dum->gadget.ep_list);
792 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
793 struct dummy_ep *ep = &dum->ep [i];
797 ep->ep.name = ep_name [i];
798 ep->ep.ops = &dummy_ep_ops;
799 list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list);
800 ep->halted = ep->already_seen = ep->setup_stage = 0;
801 ep->ep.maxpacket = ~0;
802 ep->last_io = jiffies;
803 ep->gadget = &dum->gadget;
805 INIT_LIST_HEAD (&ep->queue);
808 dum->gadget.ep0 = &dum->ep [0].ep;
809 dum->ep [0].ep.maxpacket = 64;
810 list_del_init (&dum->ep [0].ep.ep_list);
811 INIT_LIST_HEAD(&dum->fifo_req.queue);
813 dum->driver = driver;
814 dum->gadget.dev.driver = &driver->driver;
815 dev_dbg (udc_dev(dum), "binding gadget driver '%s'\n",
816 driver->driver.name);
817 if ((retval = driver->bind (&dum->gadget)) != 0) {
819 dum->gadget.dev.driver = NULL;
823 driver->driver.bus = dum->gadget.dev.parent->bus;
824 driver_register (&driver->driver);
825 device_bind_driver (&dum->gadget.dev);
827 /* khubd will enumerate this in a while */
828 spin_lock_irq (&dum->lock);
830 set_link_state (dum);
831 spin_unlock_irq (&dum->lock);
833 usb_hcd_poll_rh_status (dummy_to_hcd (dum));
836 EXPORT_SYMBOL (usb_gadget_register_driver);
839 usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
841 struct dummy *dum = the_controller;
846 if (!driver || driver != dum->driver)
849 dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n",
850 driver->driver.name);
852 spin_lock_irqsave (&dum->lock, flags);
854 set_link_state (dum);
855 spin_unlock_irqrestore (&dum->lock, flags);
857 driver->unbind (&dum->gadget);
860 device_release_driver (&dum->gadget.dev);
861 driver_unregister (&driver->driver);
863 spin_lock_irqsave (&dum->lock, flags);
865 set_link_state (dum);
866 spin_unlock_irqrestore (&dum->lock, flags);
868 usb_hcd_poll_rh_status (dummy_to_hcd (dum));
871 EXPORT_SYMBOL (usb_gadget_unregister_driver);
875 /* just declare this in any driver that really need it */
876 extern int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode);
878 int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
882 EXPORT_SYMBOL (net2280_set_fifo_mode);
885 /* The gadget structure is stored inside the hcd structure and will be
886 * released along with it. */
888 dummy_gadget_release (struct device *dev)
890 #if 0 /* usb_bus_put isn't EXPORTed! */
891 struct dummy *dum = gadget_dev_to_dummy (dev);
893 usb_bus_put (&dummy_to_hcd (dum)->self);
897 static int dummy_udc_probe (struct platform_device *pdev)
899 struct dummy *dum = the_controller;
902 dum->gadget.name = gadget_name;
903 dum->gadget.ops = &dummy_ops;
904 dum->gadget.is_dualspeed = 1;
906 /* maybe claim OTG support, though we won't complete HNP */
907 dum->gadget.is_otg = (dummy_to_hcd(dum)->self.otg_port != 0);
909 strcpy (dum->gadget.dev.bus_id, "gadget");
910 dum->gadget.dev.parent = &pdev->dev;
911 dum->gadget.dev.release = dummy_gadget_release;
912 rc = device_register (&dum->gadget.dev);
916 #if 0 /* usb_bus_get isn't EXPORTed! */
917 usb_bus_get (&dummy_to_hcd (dum)->self);
920 platform_set_drvdata (pdev, dum);
921 device_create_file (&dum->gadget.dev, &dev_attr_function);
925 static int dummy_udc_remove (struct platform_device *pdev)
927 struct dummy *dum = platform_get_drvdata (pdev);
929 platform_set_drvdata (pdev, NULL);
930 device_remove_file (&dum->gadget.dev, &dev_attr_function);
931 device_unregister (&dum->gadget.dev);
935 static int dummy_udc_suspend (struct platform_device *pdev, pm_message_t state)
937 struct dummy *dum = platform_get_drvdata(pdev);
939 dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
940 spin_lock_irq (&dum->lock);
941 dum->udc_suspended = 1;
942 set_link_state (dum);
943 spin_unlock_irq (&dum->lock);
945 pdev->dev.power.power_state = state;
946 usb_hcd_poll_rh_status (dummy_to_hcd (dum));
950 static int dummy_udc_resume (struct platform_device *pdev)
952 struct dummy *dum = platform_get_drvdata(pdev);
954 dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
955 spin_lock_irq (&dum->lock);
956 dum->udc_suspended = 0;
957 set_link_state (dum);
958 spin_unlock_irq (&dum->lock);
960 pdev->dev.power.power_state = PMSG_ON;
961 usb_hcd_poll_rh_status (dummy_to_hcd (dum));
965 static struct platform_driver dummy_udc_driver = {
966 .probe = dummy_udc_probe,
967 .remove = dummy_udc_remove,
968 .suspend = dummy_udc_suspend,
969 .resume = dummy_udc_resume,
971 .name = (char *) gadget_name,
972 .owner = THIS_MODULE,
976 /*-------------------------------------------------------------------------*/
978 /* MASTER/HOST SIDE DRIVER
980 * this uses the hcd framework to hook up to host side drivers.
981 * its root hub will only have one device, otherwise it acts like
982 * a normal host controller.
984 * when urbs are queued, they're just stuck on a list that we
985 * scan in a timer callback. that callback connects writes from
986 * the host with reads from the device, and so on, based on the
990 static int dummy_urb_enqueue (
992 struct usb_host_endpoint *ep,
1000 if (!urb->transfer_buffer && urb->transfer_buffer_length)
1003 urbp = kmalloc (sizeof *urbp, mem_flags);
1008 dum = hcd_to_dummy (hcd);
1009 spin_lock_irqsave (&dum->lock, flags);
1012 dum->udev = urb->dev;
1013 usb_get_dev (dum->udev);
1014 } else if (unlikely (dum->udev != urb->dev))
1015 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
1017 list_add_tail (&urbp->urbp_list, &dum->urbp_list);
1019 if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
1020 urb->error_count = 1; /* mark as a new urb */
1022 /* kick the scheduler, it'll do the rest */
1023 if (!timer_pending (&dum->timer))
1024 mod_timer (&dum->timer, jiffies + 1);
1026 spin_unlock_irqrestore (&dum->lock, flags);
1030 static int dummy_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
1033 unsigned long flags;
1035 /* giveback happens automatically in timer callback,
1036 * so make sure the callback happens */
1037 dum = hcd_to_dummy (hcd);
1038 spin_lock_irqsave (&dum->lock, flags);
1039 if (dum->rh_state != DUMMY_RH_RUNNING && !list_empty(&dum->urbp_list))
1040 mod_timer (&dum->timer, jiffies);
1041 spin_unlock_irqrestore (&dum->lock, flags);
1045 static void maybe_set_status (struct urb *urb, int status)
1047 spin_lock (&urb->lock);
1048 if (urb->status == -EINPROGRESS)
1049 urb->status = status;
1050 spin_unlock (&urb->lock);
1053 /* transfer up to a frame's worth; caller must own lock */
1055 transfer (struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit)
1057 struct dummy_request *req;
1060 /* if there's no request queued, the device is NAKing; return */
1061 list_for_each_entry (req, &ep->queue, queue) {
1062 unsigned host_len, dev_len, len;
1063 int is_short, to_host;
1066 /* 1..N packets of ep->ep.maxpacket each ... the last one
1067 * may be short (including zero length).
1069 * writer can send a zlp explicitly (length 0) or implicitly
1070 * (length mod maxpacket zero, and 'zero' flag); they always
1073 host_len = urb->transfer_buffer_length - urb->actual_length;
1074 dev_len = req->req.length - req->req.actual;
1075 len = min (host_len, dev_len);
1077 /* FIXME update emulated data toggle too */
1079 to_host = usb_pipein (urb->pipe);
1080 if (unlikely (len == 0))
1085 /* not enough bandwidth left? */
1086 if (limit < ep->ep.maxpacket && limit < len)
1088 len = min (len, (unsigned) limit);
1092 /* use an extra pass for the final short packet */
1093 if (len > ep->ep.maxpacket) {
1095 len -= (len % ep->ep.maxpacket);
1097 is_short = (len % ep->ep.maxpacket) != 0;
1099 /* else transfer packet(s) */
1100 ubuf = urb->transfer_buffer + urb->actual_length;
1101 rbuf = req->req.buf + req->req.actual;
1103 memcpy (ubuf, rbuf, len);
1105 memcpy (rbuf, ubuf, len);
1106 ep->last_io = jiffies;
1109 urb->actual_length += len;
1110 req->req.actual += len;
1113 /* short packets terminate, maybe with overflow/underflow.
1114 * it's only really an error to write too much.
1116 * partially filling a buffer optionally blocks queue advances
1117 * (so completion handlers can clean up the queue) but we don't
1118 * need to emulate such data-in-flight. so we only show part
1119 * of the URB_SHORT_NOT_OK effect: completion status.
1122 if (host_len == dev_len) {
1123 req->req.status = 0;
1124 maybe_set_status (urb, 0);
1125 } else if (to_host) {
1126 req->req.status = 0;
1127 if (dev_len > host_len)
1128 maybe_set_status (urb, -EOVERFLOW);
1130 maybe_set_status (urb,
1131 (urb->transfer_flags
1134 } else if (!to_host) {
1135 maybe_set_status (urb, 0);
1136 if (host_len > dev_len)
1137 req->req.status = -EOVERFLOW;
1139 req->req.status = 0;
1142 /* many requests terminate without a short packet */
1144 if (req->req.length == req->req.actual
1146 req->req.status = 0;
1147 if (urb->transfer_buffer_length == urb->actual_length
1148 && !(urb->transfer_flags
1149 & URB_ZERO_PACKET)) {
1150 maybe_set_status (urb, 0);
1154 /* device side completion --> continuable */
1155 if (req->req.status != -EINPROGRESS) {
1156 list_del_init (&req->queue);
1158 spin_unlock (&dum->lock);
1159 req->req.complete (&ep->ep, &req->req);
1160 spin_lock (&dum->lock);
1162 /* requests might have been unlinked... */
1166 /* host side completion --> terminate */
1167 if (urb->status != -EINPROGRESS)
1170 /* rescan to continue with any other queued i/o */
1177 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1179 int limit = ep->ep.maxpacket;
1181 if (dum->gadget.speed == USB_SPEED_HIGH) {
1184 /* high bandwidth mode */
1185 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1186 tmp = (tmp >> 11) & 0x03;
1187 tmp *= 8 /* applies to entire frame */;
1188 limit += limit * tmp;
1193 #define is_active(dum) ((dum->port_status & \
1194 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1195 USB_PORT_STAT_SUSPEND)) \
1196 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1198 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1202 if (!is_active (dum))
1204 if ((address & ~USB_DIR_IN) == 0)
1205 return &dum->ep [0];
1206 for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1207 struct dummy_ep *ep = &dum->ep [i];
1211 if (ep->desc->bEndpointAddress == address)
1219 #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1220 #define Dev_InRequest (Dev_Request | USB_DIR_IN)
1221 #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1222 #define Intf_InRequest (Intf_Request | USB_DIR_IN)
1223 #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1224 #define Ep_InRequest (Ep_Request | USB_DIR_IN)
1226 /* drive both sides of the transfers; looks like irq handlers to
1227 * both drivers except the callbacks aren't in_irq().
1229 static void dummy_timer (unsigned long _dum)
1231 struct dummy *dum = (struct dummy *) _dum;
1232 struct urbp *urbp, *tmp;
1233 unsigned long flags;
1237 /* simplistic model for one frame's bandwidth */
1238 switch (dum->gadget.speed) {
1240 total = 8/*bytes*/ * 12/*packets*/;
1242 case USB_SPEED_FULL:
1243 total = 64/*bytes*/ * 19/*packets*/;
1245 case USB_SPEED_HIGH:
1246 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1249 dev_err (dummy_dev(dum), "bogus device speed\n");
1253 /* FIXME if HZ != 1000 this will probably misbehave ... */
1255 /* look at each urb queued by the host side driver */
1256 spin_lock_irqsave (&dum->lock, flags);
1259 dev_err (dummy_dev(dum),
1260 "timer fired with no URBs pending?\n");
1261 spin_unlock_irqrestore (&dum->lock, flags);
1265 for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1268 dum->ep [i].already_seen = 0;
1272 list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1274 struct dummy_request *req;
1276 struct dummy_ep *ep = NULL;
1280 if (urb->status != -EINPROGRESS) {
1281 /* likely it was just unlinked */
1283 } else if (dum->rh_state != DUMMY_RH_RUNNING)
1285 type = usb_pipetype (urb->pipe);
1287 /* used up this frame's non-periodic bandwidth?
1288 * FIXME there's infinite bandwidth for control and
1289 * periodic transfers ... unrealistic.
1291 if (total <= 0 && type == PIPE_BULK)
1294 /* find the gadget's ep for this request (if configured) */
1295 address = usb_pipeendpoint (urb->pipe);
1296 if (usb_pipein (urb->pipe))
1297 address |= USB_DIR_IN;
1298 ep = find_endpoint(dum, address);
1300 /* set_configuration() disagreement */
1301 dev_dbg (dummy_dev(dum),
1302 "no ep configured for urb %p\n",
1304 maybe_set_status (urb, -EPROTO);
1308 if (ep->already_seen)
1310 ep->already_seen = 1;
1311 if (ep == &dum->ep [0] && urb->error_count) {
1312 ep->setup_stage = 1; /* a new urb */
1313 urb->error_count = 0;
1315 if (ep->halted && !ep->setup_stage) {
1316 /* NOTE: must not be iso! */
1317 dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1319 maybe_set_status (urb, -EPIPE);
1322 /* FIXME make sure both ends agree on maxpacket */
1324 /* handle control requests */
1325 if (ep == &dum->ep [0] && ep->setup_stage) {
1326 struct usb_ctrlrequest setup;
1328 struct dummy_ep *ep2;
1332 setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1333 w_index = le16_to_cpu(setup.wIndex);
1334 w_value = le16_to_cpu(setup.wValue);
1335 if (le16_to_cpu(setup.wLength) !=
1336 urb->transfer_buffer_length) {
1337 maybe_set_status (urb, -EOVERFLOW);
1341 /* paranoia, in case of stale queued data */
1342 list_for_each_entry (req, &ep->queue, queue) {
1343 list_del_init (&req->queue);
1344 req->req.status = -EOVERFLOW;
1345 dev_dbg (udc_dev(dum), "stale req = %p\n",
1348 spin_unlock (&dum->lock);
1349 req->req.complete (&ep->ep, &req->req);
1350 spin_lock (&dum->lock);
1351 ep->already_seen = 0;
1355 /* gadget driver never sees set_address or operations
1356 * on standard feature flags. some hardware doesn't
1359 ep->last_io = jiffies;
1360 ep->setup_stage = 0;
1362 switch (setup.bRequest) {
1363 case USB_REQ_SET_ADDRESS:
1364 if (setup.bRequestType != Dev_Request)
1366 dum->address = w_value;
1367 maybe_set_status (urb, 0);
1368 dev_dbg (udc_dev(dum), "set_address = %d\n",
1372 case USB_REQ_SET_FEATURE:
1373 if (setup.bRequestType == Dev_Request) {
1376 case USB_DEVICE_REMOTE_WAKEUP:
1378 case USB_DEVICE_B_HNP_ENABLE:
1379 dum->gadget.b_hnp_enable = 1;
1381 case USB_DEVICE_A_HNP_SUPPORT:
1382 dum->gadget.a_hnp_support = 1;
1384 case USB_DEVICE_A_ALT_HNP_SUPPORT:
1385 dum->gadget.a_alt_hnp_support
1389 value = -EOPNOTSUPP;
1394 maybe_set_status (urb, 0);
1397 } else if (setup.bRequestType == Ep_Request) {
1399 ep2 = find_endpoint (dum, w_index);
1401 value = -EOPNOTSUPP;
1406 maybe_set_status (urb, 0);
1409 case USB_REQ_CLEAR_FEATURE:
1410 if (setup.bRequestType == Dev_Request) {
1412 case USB_DEVICE_REMOTE_WAKEUP:
1413 dum->devstatus &= ~(1 <<
1414 USB_DEVICE_REMOTE_WAKEUP);
1416 maybe_set_status (urb, 0);
1419 value = -EOPNOTSUPP;
1422 } else if (setup.bRequestType == Ep_Request) {
1424 ep2 = find_endpoint (dum, w_index);
1426 value = -EOPNOTSUPP;
1431 maybe_set_status (urb, 0);
1434 case USB_REQ_GET_STATUS:
1435 if (setup.bRequestType == Dev_InRequest
1436 || setup.bRequestType
1438 || setup.bRequestType
1443 // device: remote wakeup, selfpowered
1444 // interface: nothing
1446 buf = (char *)urb->transfer_buffer;
1447 if (urb->transfer_buffer_length > 0) {
1448 if (setup.bRequestType ==
1450 ep2 = find_endpoint (dum, w_index);
1452 value = -EOPNOTSUPP;
1455 buf [0] = ep2->halted;
1456 } else if (setup.bRequestType ==
1463 if (urb->transfer_buffer_length > 1)
1465 urb->actual_length = min (2,
1466 urb->transfer_buffer_length);
1468 maybe_set_status (urb, 0);
1473 /* gadget driver handles all other requests. block
1474 * until setup() returns; no reentrancy issues etc.
1477 spin_unlock (&dum->lock);
1478 value = dum->driver->setup (&dum->gadget,
1480 spin_lock (&dum->lock);
1483 /* no delays (max 64KB data stage) */
1485 goto treat_control_like_bulk;
1487 /* error, see below */
1491 if (value != -EOPNOTSUPP)
1492 dev_dbg (udc_dev(dum),
1495 maybe_set_status (urb, -EPIPE);
1496 urb->actual_length = 0;
1502 /* non-control requests */
1504 switch (usb_pipetype (urb->pipe)) {
1505 case PIPE_ISOCHRONOUS:
1506 /* FIXME is it urb->interval since the last xfer?
1507 * use urb->iso_frame_desc[i].
1508 * complete whether or not ep has requests queued.
1509 * report random errors, to debug drivers.
1511 limit = max (limit, periodic_bytes (dum, ep));
1512 maybe_set_status (urb, -ENOSYS);
1515 case PIPE_INTERRUPT:
1516 /* FIXME is it urb->interval since the last xfer?
1517 * this almost certainly polls too fast.
1519 limit = max (limit, periodic_bytes (dum, ep));
1522 // case PIPE_BULK: case PIPE_CONTROL:
1524 treat_control_like_bulk:
1525 ep->last_io = jiffies;
1526 total = transfer (dum, urb, ep, limit);
1530 /* incomplete transfer? */
1531 if (urb->status == -EINPROGRESS)
1536 list_del (&urbp->urbp_list);
1539 ep->already_seen = ep->setup_stage = 0;
1541 spin_unlock (&dum->lock);
1542 usb_hcd_giveback_urb (dummy_to_hcd(dum), urb, NULL);
1543 spin_lock (&dum->lock);
1548 if (list_empty (&dum->urbp_list)) {
1549 usb_put_dev (dum->udev);
1551 } else if (dum->rh_state == DUMMY_RH_RUNNING) {
1552 /* want a 1 msec delay here */
1553 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1556 spin_unlock_irqrestore (&dum->lock, flags);
1559 /*-------------------------------------------------------------------------*/
1561 #define PORT_C_MASK \
1562 ((USB_PORT_STAT_C_CONNECTION \
1563 | USB_PORT_STAT_C_ENABLE \
1564 | USB_PORT_STAT_C_SUSPEND \
1565 | USB_PORT_STAT_C_OVERCURRENT \
1566 | USB_PORT_STAT_C_RESET) << 16)
1568 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1571 unsigned long flags;
1574 dum = hcd_to_dummy (hcd);
1576 spin_lock_irqsave (&dum->lock, flags);
1577 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
1580 if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) {
1581 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1582 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1583 set_link_state (dum);
1586 if ((dum->port_status & PORT_C_MASK) != 0) {
1588 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1591 if (dum->rh_state == DUMMY_RH_SUSPENDED)
1592 usb_hcd_resume_root_hub (hcd);
1595 spin_unlock_irqrestore (&dum->lock, flags);
1600 hub_descriptor (struct usb_hub_descriptor *desc)
1602 memset (desc, 0, sizeof *desc);
1603 desc->bDescriptorType = 0x29;
1604 desc->bDescLength = 9;
1605 desc->wHubCharacteristics = (__force __u16)
1606 (__constant_cpu_to_le16 (0x0001));
1607 desc->bNbrPorts = 1;
1608 desc->bitmap [0] = 0xff;
1609 desc->bitmap [1] = 0xff;
1612 static int dummy_hub_control (
1613 struct usb_hcd *hcd,
1622 unsigned long flags;
1624 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
1627 dum = hcd_to_dummy (hcd);
1628 spin_lock_irqsave (&dum->lock, flags);
1630 case ClearHubFeature:
1632 case ClearPortFeature:
1634 case USB_PORT_FEAT_SUSPEND:
1635 if (dum->port_status & USB_PORT_STAT_SUSPEND) {
1636 /* 20msec resume signaling */
1638 dum->re_timeout = jiffies +
1639 msecs_to_jiffies(20);
1642 case USB_PORT_FEAT_POWER:
1643 if (dum->port_status & USB_PORT_STAT_POWER)
1644 dev_dbg (dummy_dev(dum), "power-off\n");
1647 dum->port_status &= ~(1 << wValue);
1648 set_link_state (dum);
1651 case GetHubDescriptor:
1652 hub_descriptor ((struct usb_hub_descriptor *) buf);
1655 *(__le32 *) buf = __constant_cpu_to_le32 (0);
1661 /* whoever resets or resumes must GetPortStatus to
1664 if (dum->resuming &&
1665 time_after_eq (jiffies, dum->re_timeout)) {
1666 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1667 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1669 if ((dum->port_status & USB_PORT_STAT_RESET) != 0 &&
1670 time_after_eq (jiffies, dum->re_timeout)) {
1671 dum->port_status |= (USB_PORT_STAT_C_RESET << 16);
1672 dum->port_status &= ~USB_PORT_STAT_RESET;
1674 dum->port_status |= USB_PORT_STAT_ENABLE;
1675 /* give it the best speed we agree on */
1676 dum->gadget.speed = dum->driver->speed;
1677 dum->gadget.ep0->maxpacket = 64;
1678 switch (dum->gadget.speed) {
1679 case USB_SPEED_HIGH:
1681 USB_PORT_STAT_HIGH_SPEED;
1684 dum->gadget.ep0->maxpacket = 8;
1686 USB_PORT_STAT_LOW_SPEED;
1689 dum->gadget.speed = USB_SPEED_FULL;
1694 set_link_state (dum);
1695 ((__le16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1696 ((__le16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1701 case SetPortFeature:
1703 case USB_PORT_FEAT_SUSPEND:
1705 dum->port_status |= USB_PORT_STAT_SUSPEND;
1707 /* HNP would happen here; for now we
1708 * assume b_bus_req is always true.
1710 set_link_state (dum);
1711 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1712 & dum->devstatus) != 0)
1713 dev_dbg (dummy_dev(dum),
1717 case USB_PORT_FEAT_POWER:
1718 dum->port_status |= USB_PORT_STAT_POWER;
1719 set_link_state (dum);
1721 case USB_PORT_FEAT_RESET:
1722 /* if it's already enabled, disable */
1723 dum->port_status &= ~(USB_PORT_STAT_ENABLE
1724 | USB_PORT_STAT_LOW_SPEED
1725 | USB_PORT_STAT_HIGH_SPEED);
1727 /* 50msec reset signaling */
1728 dum->re_timeout = jiffies + msecs_to_jiffies(50);
1731 if ((dum->port_status & USB_PORT_STAT_POWER) != 0) {
1732 dum->port_status |= (1 << wValue);
1733 set_link_state (dum);
1739 dev_dbg (dummy_dev(dum),
1740 "hub control req%04x v%04x i%04x l%d\n",
1741 typeReq, wValue, wIndex, wLength);
1743 /* "protocol stall" on error */
1746 spin_unlock_irqrestore (&dum->lock, flags);
1748 if ((dum->port_status & PORT_C_MASK) != 0)
1749 usb_hcd_poll_rh_status (hcd);
1753 static int dummy_bus_suspend (struct usb_hcd *hcd)
1755 struct dummy *dum = hcd_to_dummy (hcd);
1757 dev_dbg (&hcd->self.root_hub->dev, "%s\n", __FUNCTION__);
1759 spin_lock_irq (&dum->lock);
1760 dum->rh_state = DUMMY_RH_SUSPENDED;
1761 set_link_state (dum);
1762 hcd->state = HC_STATE_SUSPENDED;
1763 spin_unlock_irq (&dum->lock);
1767 static int dummy_bus_resume (struct usb_hcd *hcd)
1769 struct dummy *dum = hcd_to_dummy (hcd);
1772 dev_dbg (&hcd->self.root_hub->dev, "%s\n", __FUNCTION__);
1774 spin_lock_irq (&dum->lock);
1775 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
1776 dev_warn (&hcd->self.root_hub->dev, "HC isn't running!\n");
1779 dum->rh_state = DUMMY_RH_RUNNING;
1780 set_link_state (dum);
1781 if (!list_empty(&dum->urbp_list))
1782 mod_timer (&dum->timer, jiffies);
1783 hcd->state = HC_STATE_RUNNING;
1785 spin_unlock_irq (&dum->lock);
1789 /*-------------------------------------------------------------------------*/
1791 static inline ssize_t
1792 show_urb (char *buf, size_t size, struct urb *urb)
1794 int ep = usb_pipeendpoint (urb->pipe);
1796 return snprintf (buf, size,
1797 "urb/%p %s ep%d%s%s len %d/%d\n",
1800 switch (urb->dev->speed) {
1801 case USB_SPEED_LOW: s = "ls"; break;
1802 case USB_SPEED_FULL: s = "fs"; break;
1803 case USB_SPEED_HIGH: s = "hs"; break;
1804 default: s = "?"; break;
1806 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1808 switch (usb_pipetype (urb->pipe)) { \
1809 case PIPE_CONTROL: s = ""; break; \
1810 case PIPE_BULK: s = "-bulk"; break; \
1811 case PIPE_INTERRUPT: s = "-int"; break; \
1812 default: s = "-iso"; break; \
1814 urb->actual_length, urb->transfer_buffer_length);
1818 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
1820 struct usb_hcd *hcd = dev_get_drvdata (dev);
1821 struct dummy *dum = hcd_to_dummy (hcd);
1824 unsigned long flags;
1826 spin_lock_irqsave (&dum->lock, flags);
1827 list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1830 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1834 spin_unlock_irqrestore (&dum->lock, flags);
1838 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1840 static int dummy_start (struct usb_hcd *hcd)
1844 dum = hcd_to_dummy (hcd);
1847 * MASTER side init ... we emulate a root hub that'll only ever
1848 * talk to one device (the slave side). Also appears in sysfs,
1849 * just like more familiar pci-based HCDs.
1851 spin_lock_init (&dum->lock);
1852 init_timer (&dum->timer);
1853 dum->timer.function = dummy_timer;
1854 dum->timer.data = (unsigned long) dum;
1855 dum->rh_state = DUMMY_RH_RUNNING;
1857 INIT_LIST_HEAD (&dum->urbp_list);
1859 /* only show a low-power port: just 8mA */
1860 hcd->power_budget = 8;
1861 hcd->state = HC_STATE_RUNNING;
1862 hcd->uses_new_polling = 1;
1864 #ifdef CONFIG_USB_OTG
1865 hcd->self.otg_port = 1;
1868 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1869 device_create_file (dummy_dev(dum), &dev_attr_urbs);
1873 static void dummy_stop (struct usb_hcd *hcd)
1877 dum = hcd_to_dummy (hcd);
1879 device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1880 usb_gadget_unregister_driver (dum->driver);
1881 dev_info (dummy_dev(dum), "stopped\n");
1884 /*-------------------------------------------------------------------------*/
1886 static int dummy_h_get_frame (struct usb_hcd *hcd)
1888 return dummy_g_get_frame (NULL);
1891 static const struct hc_driver dummy_hcd = {
1892 .description = (char *) driver_name,
1893 .product_desc = "Dummy host controller",
1894 .hcd_priv_size = sizeof(struct dummy),
1898 .start = dummy_start,
1901 .urb_enqueue = dummy_urb_enqueue,
1902 .urb_dequeue = dummy_urb_dequeue,
1904 .get_frame_number = dummy_h_get_frame,
1906 .hub_status_data = dummy_hub_status,
1907 .hub_control = dummy_hub_control,
1908 .bus_suspend = dummy_bus_suspend,
1909 .bus_resume = dummy_bus_resume,
1912 static int dummy_hcd_probe(struct platform_device *pdev)
1914 struct usb_hcd *hcd;
1917 dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1919 hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, pdev->dev.bus_id);
1922 the_controller = hcd_to_dummy (hcd);
1924 retval = usb_add_hcd(hcd, 0, 0);
1927 the_controller = NULL;
1932 static int dummy_hcd_remove (struct platform_device *pdev)
1934 struct usb_hcd *hcd;
1936 hcd = platform_get_drvdata (pdev);
1937 usb_remove_hcd (hcd);
1939 the_controller = NULL;
1943 static int dummy_hcd_suspend (struct platform_device *pdev, pm_message_t state)
1945 struct usb_hcd *hcd;
1949 dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
1951 hcd = platform_get_drvdata (pdev);
1952 dum = hcd_to_dummy (hcd);
1953 if (dum->rh_state == DUMMY_RH_RUNNING) {
1954 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
1957 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1961 static int dummy_hcd_resume (struct platform_device *pdev)
1963 struct usb_hcd *hcd;
1965 dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
1967 hcd = platform_get_drvdata (pdev);
1968 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1969 usb_hcd_poll_rh_status (hcd);
1973 static struct platform_driver dummy_hcd_driver = {
1974 .probe = dummy_hcd_probe,
1975 .remove = dummy_hcd_remove,
1976 .suspend = dummy_hcd_suspend,
1977 .resume = dummy_hcd_resume,
1979 .name = (char *) driver_name,
1980 .owner = THIS_MODULE,
1984 /*-------------------------------------------------------------------------*/
1986 /* These don't need to do anything because the pdev structures are
1987 * statically allocated. */
1989 dummy_udc_release (struct device *dev) {}
1992 dummy_hcd_release (struct device *dev) {}
1994 static struct platform_device the_udc_pdev = {
1995 .name = (char *) gadget_name,
1998 .release = dummy_udc_release,
2002 static struct platform_device the_hcd_pdev = {
2003 .name = (char *) driver_name,
2006 .release = dummy_hcd_release,
2010 static int __init init (void)
2014 if (usb_disabled ())
2017 retval = platform_driver_register (&dummy_hcd_driver);
2021 retval = platform_driver_register (&dummy_udc_driver);
2023 goto err_register_udc_driver;
2025 retval = platform_device_register (&the_hcd_pdev);
2027 goto err_register_hcd;
2029 retval = platform_device_register (&the_udc_pdev);
2031 goto err_register_udc;
2035 platform_device_unregister (&the_hcd_pdev);
2037 platform_driver_unregister (&dummy_udc_driver);
2038 err_register_udc_driver:
2039 platform_driver_unregister (&dummy_hcd_driver);
2044 static void __exit cleanup (void)
2046 platform_device_unregister (&the_udc_pdev);
2047 platform_device_unregister (&the_hcd_pdev);
2048 platform_driver_unregister (&dummy_udc_driver);
2049 platform_driver_unregister (&dummy_hcd_driver);
2051 module_exit (cleanup);