2 * (C) Copyright Linus Torvalds 1999
3 * (C) Copyright Johannes Erdfelt 1999-2001
4 * (C) Copyright Andreas Gal 1999
5 * (C) Copyright Gregory P. Smith 1999
6 * (C) Copyright Deti Fliegl 1999
7 * (C) Copyright Randy Dunlap 2000
8 * (C) Copyright David Brownell 2000-2002
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software Foundation,
22 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #include <linux/module.h>
26 #include <linux/version.h>
27 #include <linux/kernel.h>
28 #include <linux/slab.h>
29 #include <linux/completion.h>
30 #include <linux/utsname.h>
33 #include <asm/scatterlist.h>
34 #include <linux/device.h>
35 #include <linux/dma-mapping.h>
36 #include <linux/mutex.h>
38 #include <asm/byteorder.h>
39 #include <linux/platform_device.h>
41 #include <linux/usb.h>
48 // #define USB_BANDWIDTH_MESSAGES
50 /*-------------------------------------------------------------------------*/
53 * USB Host Controller Driver framework
55 * Plugs into usbcore (usb_bus) and lets HCDs share code, minimizing
56 * HCD-specific behaviors/bugs.
58 * This does error checks, tracks devices and urbs, and delegates to a
59 * "hc_driver" only for code (and data) that really needs to know about
60 * hardware differences. That includes root hub registers, i/o queues,
61 * and so on ... but as little else as possible.
63 * Shared code includes most of the "root hub" code (these are emulated,
64 * though each HC's hardware works differently) and PCI glue, plus request
65 * tracking overhead. The HCD code should only block on spinlocks or on
66 * hardware handshaking; blocking on software events (such as other kernel
67 * threads releasing resources, or completing actions) is all generic.
69 * Happens the USB 2.0 spec says this would be invisible inside the "USBD",
70 * and includes mostly a "HCDI" (HCD Interface) along with some APIs used
71 * only by the hub driver ... and that neither should be seen or used by
72 * usb client device drivers.
74 * Contributors of ideas or unattributed patches include: David Brownell,
75 * Roman Weissgaerber, Rory Bolt, Greg Kroah-Hartman, ...
78 * 2002-02-21 Pull in most of the usb_bus support from usb.c; some
79 * associated cleanup. "usb_hcd" still != "usb_bus".
80 * 2001-12-12 Initial patch version for Linux 2.5.1 kernel.
83 /*-------------------------------------------------------------------------*/
85 /* host controllers we manage */
86 LIST_HEAD (usb_bus_list);
87 EXPORT_SYMBOL_GPL (usb_bus_list);
89 /* used when allocating bus numbers */
92 unsigned long busmap [USB_MAXBUS / (8*sizeof (unsigned long))];
94 static struct usb_busmap busmap;
96 /* used when updating list of hcds */
97 DEFINE_MUTEX(usb_bus_list_lock); /* exported only for usbfs */
98 EXPORT_SYMBOL_GPL (usb_bus_list_lock);
100 /* used for controlling access to virtual root hubs */
101 static DEFINE_SPINLOCK(hcd_root_hub_lock);
103 /* used when updating hcd data */
104 static DEFINE_SPINLOCK(hcd_data_lock);
106 /* wait queue for synchronous unlinks */
107 DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);
109 /*-------------------------------------------------------------------------*/
112 * Sharable chunks of root hub code.
115 /*-------------------------------------------------------------------------*/
117 #define KERNEL_REL ((LINUX_VERSION_CODE >> 16) & 0x0ff)
118 #define KERNEL_VER ((LINUX_VERSION_CODE >> 8) & 0x0ff)
120 /* usb 2.0 root hub device descriptor */
121 static const u8 usb2_rh_dev_descriptor [18] = {
122 0x12, /* __u8 bLength; */
123 0x01, /* __u8 bDescriptorType; Device */
124 0x00, 0x02, /* __le16 bcdUSB; v2.0 */
126 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
127 0x00, /* __u8 bDeviceSubClass; */
128 0x01, /* __u8 bDeviceProtocol; [ usb 2.0 single TT ]*/
129 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
131 0x00, 0x00, /* __le16 idVendor; */
132 0x00, 0x00, /* __le16 idProduct; */
133 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
135 0x03, /* __u8 iManufacturer; */
136 0x02, /* __u8 iProduct; */
137 0x01, /* __u8 iSerialNumber; */
138 0x01 /* __u8 bNumConfigurations; */
141 /* no usb 2.0 root hub "device qualifier" descriptor: one speed only */
143 /* usb 1.1 root hub device descriptor */
144 static const u8 usb11_rh_dev_descriptor [18] = {
145 0x12, /* __u8 bLength; */
146 0x01, /* __u8 bDescriptorType; Device */
147 0x10, 0x01, /* __le16 bcdUSB; v1.1 */
149 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
150 0x00, /* __u8 bDeviceSubClass; */
151 0x00, /* __u8 bDeviceProtocol; [ low/full speeds only ] */
152 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
154 0x00, 0x00, /* __le16 idVendor; */
155 0x00, 0x00, /* __le16 idProduct; */
156 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
158 0x03, /* __u8 iManufacturer; */
159 0x02, /* __u8 iProduct; */
160 0x01, /* __u8 iSerialNumber; */
161 0x01 /* __u8 bNumConfigurations; */
165 /*-------------------------------------------------------------------------*/
167 /* Configuration descriptors for our root hubs */
169 static const u8 fs_rh_config_descriptor [] = {
171 /* one configuration */
172 0x09, /* __u8 bLength; */
173 0x02, /* __u8 bDescriptorType; Configuration */
174 0x19, 0x00, /* __le16 wTotalLength; */
175 0x01, /* __u8 bNumInterfaces; (1) */
176 0x01, /* __u8 bConfigurationValue; */
177 0x00, /* __u8 iConfiguration; */
178 0xc0, /* __u8 bmAttributes;
183 0x00, /* __u8 MaxPower; */
186 * USB 2.0, single TT organization (mandatory):
187 * one interface, protocol 0
189 * USB 2.0, multiple TT organization (optional):
190 * two interfaces, protocols 1 (like single TT)
191 * and 2 (multiple TT mode) ... config is
197 0x09, /* __u8 if_bLength; */
198 0x04, /* __u8 if_bDescriptorType; Interface */
199 0x00, /* __u8 if_bInterfaceNumber; */
200 0x00, /* __u8 if_bAlternateSetting; */
201 0x01, /* __u8 if_bNumEndpoints; */
202 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
203 0x00, /* __u8 if_bInterfaceSubClass; */
204 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
205 0x00, /* __u8 if_iInterface; */
207 /* one endpoint (status change endpoint) */
208 0x07, /* __u8 ep_bLength; */
209 0x05, /* __u8 ep_bDescriptorType; Endpoint */
210 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
211 0x03, /* __u8 ep_bmAttributes; Interrupt */
212 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
213 0xff /* __u8 ep_bInterval; (255ms -- usb 2.0 spec) */
216 static const u8 hs_rh_config_descriptor [] = {
218 /* one configuration */
219 0x09, /* __u8 bLength; */
220 0x02, /* __u8 bDescriptorType; Configuration */
221 0x19, 0x00, /* __le16 wTotalLength; */
222 0x01, /* __u8 bNumInterfaces; (1) */
223 0x01, /* __u8 bConfigurationValue; */
224 0x00, /* __u8 iConfiguration; */
225 0xc0, /* __u8 bmAttributes;
230 0x00, /* __u8 MaxPower; */
233 * USB 2.0, single TT organization (mandatory):
234 * one interface, protocol 0
236 * USB 2.0, multiple TT organization (optional):
237 * two interfaces, protocols 1 (like single TT)
238 * and 2 (multiple TT mode) ... config is
244 0x09, /* __u8 if_bLength; */
245 0x04, /* __u8 if_bDescriptorType; Interface */
246 0x00, /* __u8 if_bInterfaceNumber; */
247 0x00, /* __u8 if_bAlternateSetting; */
248 0x01, /* __u8 if_bNumEndpoints; */
249 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
250 0x00, /* __u8 if_bInterfaceSubClass; */
251 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
252 0x00, /* __u8 if_iInterface; */
254 /* one endpoint (status change endpoint) */
255 0x07, /* __u8 ep_bLength; */
256 0x05, /* __u8 ep_bDescriptorType; Endpoint */
257 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
258 0x03, /* __u8 ep_bmAttributes; Interrupt */
259 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
260 0x0c /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
263 /*-------------------------------------------------------------------------*/
266 * helper routine for returning string descriptors in UTF-16LE
267 * input can actually be ISO-8859-1; ASCII is its 7-bit subset
269 static int ascii2utf (char *s, u8 *utf, int utfmax)
273 for (retval = 0; *s && utfmax > 1; utfmax -= 2, retval += 2) {
285 * rh_string - provides manufacturer, product and serial strings for root hub
286 * @id: the string ID number (1: serial number, 2: product, 3: vendor)
287 * @hcd: the host controller for this root hub
288 * @type: string describing our driver
289 * @data: return packet in UTF-16 LE
290 * @len: length of the return packet
292 * Produces either a manufacturer, product or serial number string for the
293 * virtual root hub device.
295 static int rh_string (
305 buf[0] = 4; buf[1] = 3; /* 4 bytes string data */
306 buf[2] = 0x09; buf[3] = 0x04; /* MSFT-speak for "en-us" */
308 memcpy (data, buf, len);
312 } else if (id == 1) {
313 strlcpy (buf, hcd->self.bus_name, sizeof buf);
315 // product description
316 } else if (id == 2) {
317 strlcpy (buf, hcd->product_desc, sizeof buf);
319 // id 3 == vendor description
320 } else if (id == 3) {
321 snprintf (buf, sizeof buf, "%s %s %s", system_utsname.sysname,
322 system_utsname.release, hcd->driver->description);
324 // unsupported IDs --> "protocol stall"
328 switch (len) { /* All cases fall through */
330 len = 2 + ascii2utf (buf, data + 2, len - 2);
332 data [1] = 3; /* type == string */
334 data [0] = 2 * (strlen (buf) + 1);
336 ; /* Compiler wants a statement here */
342 /* Root hub control transfers execute synchronously */
343 static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
345 struct usb_ctrlrequest *cmd;
346 u16 typeReq, wValue, wIndex, wLength;
347 u8 *ubuf = urb->transfer_buffer;
348 u8 tbuf [sizeof (struct usb_hub_descriptor)];
349 const u8 *bufp = tbuf;
351 int patch_wakeup = 0;
356 cmd = (struct usb_ctrlrequest *) urb->setup_packet;
357 typeReq = (cmd->bRequestType << 8) | cmd->bRequest;
358 wValue = le16_to_cpu (cmd->wValue);
359 wIndex = le16_to_cpu (cmd->wIndex);
360 wLength = le16_to_cpu (cmd->wLength);
362 if (wLength > urb->transfer_buffer_length)
365 urb->actual_length = 0;
368 /* DEVICE REQUESTS */
370 /* The root hub's remote wakeup enable bit is implemented using
371 * driver model wakeup flags. If this system supports wakeup
372 * through USB, userspace may change the default "allow wakeup"
373 * policy through sysfs or these calls.
375 * Most root hubs support wakeup from downstream devices, for
376 * runtime power management (disabling USB clocks and reducing
377 * VBUS power usage). However, not all of them do so; silicon,
378 * board, and BIOS bugs here are not uncommon, so these can't
379 * be treated quite like external hubs.
381 * Likewise, not all root hubs will pass wakeup events upstream,
382 * to wake up the whole system. So don't assume root hub and
383 * controller capabilities are identical.
386 case DeviceRequest | USB_REQ_GET_STATUS:
387 tbuf [0] = (device_may_wakeup(&hcd->self.root_hub->dev)
388 << USB_DEVICE_REMOTE_WAKEUP)
389 | (1 << USB_DEVICE_SELF_POWERED);
393 case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
394 if (wValue == USB_DEVICE_REMOTE_WAKEUP)
395 device_set_wakeup_enable(&hcd->self.root_hub->dev, 0);
399 case DeviceOutRequest | USB_REQ_SET_FEATURE:
400 if (device_can_wakeup(&hcd->self.root_hub->dev)
401 && wValue == USB_DEVICE_REMOTE_WAKEUP)
402 device_set_wakeup_enable(&hcd->self.root_hub->dev, 1);
406 case DeviceRequest | USB_REQ_GET_CONFIGURATION:
410 case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
412 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
413 switch (wValue & 0xff00) {
414 case USB_DT_DEVICE << 8:
415 if (hcd->driver->flags & HCD_USB2)
416 bufp = usb2_rh_dev_descriptor;
417 else if (hcd->driver->flags & HCD_USB11)
418 bufp = usb11_rh_dev_descriptor;
423 case USB_DT_CONFIG << 8:
424 if (hcd->driver->flags & HCD_USB2) {
425 bufp = hs_rh_config_descriptor;
426 len = sizeof hs_rh_config_descriptor;
428 bufp = fs_rh_config_descriptor;
429 len = sizeof fs_rh_config_descriptor;
431 if (device_can_wakeup(&hcd->self.root_hub->dev))
434 case USB_DT_STRING << 8:
435 n = rh_string (wValue & 0xff, hcd, ubuf, wLength);
438 urb->actual_length = n;
444 case DeviceRequest | USB_REQ_GET_INTERFACE:
448 case DeviceOutRequest | USB_REQ_SET_INTERFACE:
450 case DeviceOutRequest | USB_REQ_SET_ADDRESS:
451 // wValue == urb->dev->devaddr
452 dev_dbg (hcd->self.controller, "root hub device address %d\n",
456 /* INTERFACE REQUESTS (no defined feature/status flags) */
458 /* ENDPOINT REQUESTS */
460 case EndpointRequest | USB_REQ_GET_STATUS:
461 // ENDPOINT_HALT flag
466 case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
467 case EndpointOutRequest | USB_REQ_SET_FEATURE:
468 dev_dbg (hcd->self.controller, "no endpoint features yet\n");
471 /* CLASS REQUESTS (and errors) */
474 /* non-generic request */
480 case GetHubDescriptor:
481 len = sizeof (struct usb_hub_descriptor);
484 status = hcd->driver->hub_control (hcd,
485 typeReq, wValue, wIndex,
489 /* "protocol stall" on error */
495 if (status != -EPIPE) {
496 dev_dbg (hcd->self.controller,
497 "CTRL: TypeReq=0x%x val=0x%x "
498 "idx=0x%x len=%d ==> %d\n",
499 typeReq, wValue, wIndex,
504 if (urb->transfer_buffer_length < len)
505 len = urb->transfer_buffer_length;
506 urb->actual_length = len;
507 // always USB_DIR_IN, toward host
508 memcpy (ubuf, bufp, len);
510 /* report whether RH hardware supports remote wakeup */
512 len > offsetof (struct usb_config_descriptor,
514 ((struct usb_config_descriptor *)ubuf)->bmAttributes
515 |= USB_CONFIG_ATT_WAKEUP;
518 /* any errors get returned through the urb completion */
519 local_irq_save (flags);
520 spin_lock (&urb->lock);
521 if (urb->status == -EINPROGRESS)
522 urb->status = status;
523 spin_unlock (&urb->lock);
524 usb_hcd_giveback_urb (hcd, urb, NULL);
525 local_irq_restore (flags);
529 /*-------------------------------------------------------------------------*/
532 * Root Hub interrupt transfers are polled using a timer if the
533 * driver requests it; otherwise the driver is responsible for
534 * calling usb_hcd_poll_rh_status() when an event occurs.
536 * Completions are called in_interrupt(), but they may or may not
539 void usb_hcd_poll_rh_status(struct usb_hcd *hcd)
544 char buffer[4]; /* Any root hubs with > 31 ports? */
546 if (!hcd->uses_new_polling && !hcd->status_urb)
549 length = hcd->driver->hub_status_data(hcd, buffer);
552 /* try to complete the status urb */
553 local_irq_save (flags);
554 spin_lock(&hcd_root_hub_lock);
555 urb = hcd->status_urb;
557 spin_lock(&urb->lock);
558 if (urb->status == -EINPROGRESS) {
559 hcd->poll_pending = 0;
560 hcd->status_urb = NULL;
563 urb->actual_length = length;
564 memcpy(urb->transfer_buffer, buffer, length);
565 } else /* urb has been unlinked */
567 spin_unlock(&urb->lock);
570 spin_unlock(&hcd_root_hub_lock);
572 /* local irqs are always blocked in completions */
574 usb_hcd_giveback_urb (hcd, urb, NULL);
576 hcd->poll_pending = 1;
577 local_irq_restore (flags);
580 /* The USB 2.0 spec says 256 ms. This is close enough and won't
581 * exceed that limit if HZ is 100. */
582 if (hcd->uses_new_polling ? hcd->poll_rh :
583 (length == 0 && hcd->status_urb != NULL))
584 mod_timer (&hcd->rh_timer, jiffies + msecs_to_jiffies(250));
586 EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status);
589 static void rh_timer_func (unsigned long _hcd)
591 usb_hcd_poll_rh_status((struct usb_hcd *) _hcd);
594 /*-------------------------------------------------------------------------*/
596 static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb)
600 int len = 1 + (urb->dev->maxchild / 8);
602 spin_lock_irqsave (&hcd_root_hub_lock, flags);
603 if (urb->status != -EINPROGRESS) /* already unlinked */
604 retval = urb->status;
605 else if (hcd->status_urb || urb->transfer_buffer_length < len) {
606 dev_dbg (hcd->self.controller, "not queuing rh status urb\n");
609 hcd->status_urb = urb;
610 urb->hcpriv = hcd; /* indicate it's queued */
612 if (!hcd->uses_new_polling)
613 mod_timer (&hcd->rh_timer, jiffies +
614 msecs_to_jiffies(250));
616 /* If a status change has already occurred, report it ASAP */
617 else if (hcd->poll_pending)
618 mod_timer (&hcd->rh_timer, jiffies);
621 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
625 static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb)
627 if (usb_pipeint (urb->pipe))
628 return rh_queue_status (hcd, urb);
629 if (usb_pipecontrol (urb->pipe))
630 return rh_call_control (hcd, urb);
634 /*-------------------------------------------------------------------------*/
636 /* Unlinks of root-hub control URBs are legal, but they don't do anything
637 * since these URBs always execute synchronously.
639 static int usb_rh_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
643 if (usb_pipeendpoint(urb->pipe) == 0) { /* Control URB */
646 } else { /* Status URB */
647 if (!hcd->uses_new_polling)
648 del_timer (&hcd->rh_timer);
649 local_irq_save (flags);
650 spin_lock (&hcd_root_hub_lock);
651 if (urb == hcd->status_urb) {
652 hcd->status_urb = NULL;
655 urb = NULL; /* wasn't fully queued */
656 spin_unlock (&hcd_root_hub_lock);
658 usb_hcd_giveback_urb (hcd, urb, NULL);
659 local_irq_restore (flags);
665 /*-------------------------------------------------------------------------*/
667 static struct class *usb_host_class;
669 int usb_host_init(void)
673 usb_host_class = class_create(THIS_MODULE, "usb_host");
674 if (IS_ERR(usb_host_class))
675 retval = PTR_ERR(usb_host_class);
679 void usb_host_cleanup(void)
681 class_destroy(usb_host_class);
685 * usb_bus_init - shared initialization code
686 * @bus: the bus structure being initialized
688 * This code is used to initialize a usb_bus structure, memory for which is
689 * separately managed.
691 static void usb_bus_init (struct usb_bus *bus)
693 memset (&bus->devmap, 0, sizeof(struct usb_devmap));
695 bus->devnum_next = 1;
697 bus->root_hub = NULL;
699 bus->bandwidth_allocated = 0;
700 bus->bandwidth_int_reqs = 0;
701 bus->bandwidth_isoc_reqs = 0;
703 INIT_LIST_HEAD (&bus->bus_list);
706 /*-------------------------------------------------------------------------*/
709 * usb_register_bus - registers the USB host controller with the usb core
710 * @bus: pointer to the bus to register
711 * Context: !in_interrupt()
713 * Assigns a bus number, and links the controller into usbcore data
714 * structures so that it can be seen by scanning the bus list.
716 static int usb_register_bus(struct usb_bus *bus)
720 mutex_lock(&usb_bus_list_lock);
721 busnum = find_next_zero_bit (busmap.busmap, USB_MAXBUS, 1);
722 if (busnum < USB_MAXBUS) {
723 set_bit (busnum, busmap.busmap);
724 bus->busnum = busnum;
726 printk (KERN_ERR "%s: too many buses\n", usbcore_name);
727 mutex_unlock(&usb_bus_list_lock);
731 bus->class_dev = class_device_create(usb_host_class, NULL, MKDEV(0,0),
732 bus->controller, "usb_host%d", busnum);
733 if (IS_ERR(bus->class_dev)) {
734 clear_bit(busnum, busmap.busmap);
735 mutex_unlock(&usb_bus_list_lock);
736 return PTR_ERR(bus->class_dev);
739 class_set_devdata(bus->class_dev, bus);
741 /* Add it to the local list of buses */
742 list_add (&bus->bus_list, &usb_bus_list);
743 mutex_unlock(&usb_bus_list_lock);
745 usb_notify_add_bus(bus);
747 dev_info (bus->controller, "new USB bus registered, assigned bus number %d\n", bus->busnum);
752 * usb_deregister_bus - deregisters the USB host controller
753 * @bus: pointer to the bus to deregister
754 * Context: !in_interrupt()
756 * Recycles the bus number, and unlinks the controller from usbcore data
757 * structures so that it won't be seen by scanning the bus list.
759 static void usb_deregister_bus (struct usb_bus *bus)
761 dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum);
764 * NOTE: make sure that all the devices are removed by the
765 * controller code, as well as having it call this when cleaning
768 mutex_lock(&usb_bus_list_lock);
769 list_del (&bus->bus_list);
770 mutex_unlock(&usb_bus_list_lock);
772 usb_notify_remove_bus(bus);
774 clear_bit (bus->busnum, busmap.busmap);
776 class_device_unregister(bus->class_dev);
780 * register_root_hub - called by usb_add_hcd() to register a root hub
781 * @hcd: host controller for this root hub
783 * This function registers the root hub with the USB subsystem. It sets up
784 * the device properly in the device tree and then calls usb_new_device()
785 * to register the usb device. It also assigns the root hub's USB address
788 static int register_root_hub(struct usb_hcd *hcd)
790 struct device *parent_dev = hcd->self.controller;
791 struct usb_device *usb_dev = hcd->self.root_hub;
792 const int devnum = 1;
795 usb_dev->devnum = devnum;
796 usb_dev->bus->devnum_next = devnum + 1;
797 memset (&usb_dev->bus->devmap.devicemap, 0,
798 sizeof usb_dev->bus->devmap.devicemap);
799 set_bit (devnum, usb_dev->bus->devmap.devicemap);
800 usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
802 mutex_lock(&usb_bus_list_lock);
804 usb_dev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
805 retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE);
806 if (retval != sizeof usb_dev->descriptor) {
807 mutex_unlock(&usb_bus_list_lock);
808 dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
809 usb_dev->dev.bus_id, retval);
810 return (retval < 0) ? retval : -EMSGSIZE;
813 retval = usb_new_device (usb_dev);
815 dev_err (parent_dev, "can't register root hub for %s, %d\n",
816 usb_dev->dev.bus_id, retval);
818 mutex_unlock(&usb_bus_list_lock);
821 spin_lock_irq (&hcd_root_hub_lock);
822 hcd->rh_registered = 1;
823 spin_unlock_irq (&hcd_root_hub_lock);
825 /* Did the HC die before the root hub was registered? */
826 if (hcd->state == HC_STATE_HALT)
827 usb_hc_died (hcd); /* This time clean up */
833 void usb_enable_root_hub_irq (struct usb_bus *bus)
837 hcd = container_of (bus, struct usb_hcd, self);
838 if (hcd->driver->hub_irq_enable && !hcd->poll_rh &&
839 hcd->state != HC_STATE_HALT)
840 hcd->driver->hub_irq_enable (hcd);
844 /*-------------------------------------------------------------------------*/
847 * usb_calc_bus_time - approximate periodic transaction time in nanoseconds
848 * @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
849 * @is_input: true iff the transaction sends data to the host
850 * @isoc: true for isochronous transactions, false for interrupt ones
851 * @bytecount: how many bytes in the transaction.
853 * Returns approximate bus time in nanoseconds for a periodic transaction.
854 * See USB 2.0 spec section 5.11.3; only periodic transfers need to be
855 * scheduled in software, this function is only used for such scheduling.
857 long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
862 case USB_SPEED_LOW: /* INTR only */
864 tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L;
865 return (64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
867 tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L;
868 return (64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
870 case USB_SPEED_FULL: /* ISOC or INTR */
872 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
873 return (((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp);
875 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
876 return (9107L + BW_HOST_DELAY + tmp);
878 case USB_SPEED_HIGH: /* ISOC or INTR */
879 // FIXME adjust for input vs output
881 tmp = HS_NSECS_ISO (bytecount);
883 tmp = HS_NSECS (bytecount);
886 pr_debug ("%s: bogus device speed!\n", usbcore_name);
890 EXPORT_SYMBOL (usb_calc_bus_time);
893 * usb_check_bandwidth():
895 * old_alloc is from host_controller->bandwidth_allocated in microseconds;
896 * bustime is from calc_bus_time(), but converted to microseconds.
898 * returns <bustime in us> if successful,
899 * or -ENOSPC if bandwidth request fails.
902 * This initial implementation does not use Endpoint.bInterval
903 * in managing bandwidth allocation.
904 * It probably needs to be expanded to use Endpoint.bInterval.
905 * This can be done as a later enhancement (correction).
907 * This will also probably require some kind of
908 * frame allocation tracking...meaning, for example,
909 * that if multiple drivers request interrupts every 10 USB frames,
910 * they don't all have to be allocated at
911 * frame numbers N, N+10, N+20, etc. Some of them could be at
912 * N+11, N+21, N+31, etc., and others at
913 * N+12, N+22, N+32, etc.
915 * Similarly for isochronous transfers...
917 * Individual HCDs can schedule more directly ... this logic
918 * is not correct for high speed transfers.
920 int usb_check_bandwidth (struct usb_device *dev, struct urb *urb)
922 unsigned int pipe = urb->pipe;
924 int is_in = usb_pipein (pipe);
925 int is_iso = usb_pipeisoc (pipe);
926 int old_alloc = dev->bus->bandwidth_allocated;
930 bustime = NS_TO_US (usb_calc_bus_time (dev->speed, is_in, is_iso,
931 usb_maxpacket (dev, pipe, !is_in)));
933 bustime /= urb->number_of_packets;
935 new_alloc = old_alloc + (int) bustime;
936 if (new_alloc > FRAME_TIME_MAX_USECS_ALLOC) {
939 #ifdef CONFIG_USB_BANDWIDTH
944 dev_dbg (&dev->dev, "usb_check_bandwidth %sFAILED: %d + %ld = %d usec\n",
945 mode, old_alloc, bustime, new_alloc);
947 #ifdef CONFIG_USB_BANDWIDTH
948 bustime = -ENOSPC; /* report error */
954 EXPORT_SYMBOL (usb_check_bandwidth);
958 * usb_claim_bandwidth - records bandwidth for a periodic transfer
959 * @dev: source/target of request
960 * @urb: request (urb->dev == dev)
961 * @bustime: bandwidth consumed, in (average) microseconds per frame
962 * @isoc: true iff the request is isochronous
964 * Bus bandwidth reservations are recorded purely for diagnostic purposes.
965 * HCDs are expected not to overcommit periodic bandwidth, and to record such
966 * reservations whenever endpoints are added to the periodic schedule.
968 * FIXME averaging per-frame is suboptimal. Better to sum over the HCD's
969 * entire periodic schedule ... 32 frames for OHCI, 1024 for UHCI, settable
970 * for EHCI (256/512/1024 frames, default 1024) and have the bus expose how
971 * large its periodic schedule is.
973 void usb_claim_bandwidth (struct usb_device *dev, struct urb *urb, int bustime, int isoc)
975 dev->bus->bandwidth_allocated += bustime;
977 dev->bus->bandwidth_isoc_reqs++;
979 dev->bus->bandwidth_int_reqs++;
980 urb->bandwidth = bustime;
982 #ifdef USB_BANDWIDTH_MESSAGES
983 dev_dbg (&dev->dev, "bandwidth alloc increased by %d (%s) to %d for %d requesters\n",
985 isoc ? "ISOC" : "INTR",
986 dev->bus->bandwidth_allocated,
987 dev->bus->bandwidth_int_reqs + dev->bus->bandwidth_isoc_reqs);
990 EXPORT_SYMBOL (usb_claim_bandwidth);
994 * usb_release_bandwidth - reverses effect of usb_claim_bandwidth()
995 * @dev: source/target of request
996 * @urb: request (urb->dev == dev)
997 * @isoc: true iff the request is isochronous
999 * This records that previously allocated bandwidth has been released.
1000 * Bandwidth is released when endpoints are removed from the host controller's
1001 * periodic schedule.
1003 void usb_release_bandwidth (struct usb_device *dev, struct urb *urb, int isoc)
1005 dev->bus->bandwidth_allocated -= urb->bandwidth;
1007 dev->bus->bandwidth_isoc_reqs--;
1009 dev->bus->bandwidth_int_reqs--;
1011 #ifdef USB_BANDWIDTH_MESSAGES
1012 dev_dbg (&dev->dev, "bandwidth alloc reduced by %d (%s) to %d for %d requesters\n",
1014 isoc ? "ISOC" : "INTR",
1015 dev->bus->bandwidth_allocated,
1016 dev->bus->bandwidth_int_reqs + dev->bus->bandwidth_isoc_reqs);
1020 EXPORT_SYMBOL (usb_release_bandwidth);
1023 /*-------------------------------------------------------------------------*/
1026 * Generic HC operations.
1029 /*-------------------------------------------------------------------------*/
1031 static void urb_unlink (struct urb *urb)
1033 unsigned long flags;
1035 /* Release any periodic transfer bandwidth */
1037 usb_release_bandwidth (urb->dev, urb,
1038 usb_pipeisoc (urb->pipe));
1040 /* clear all state linking urb to this dev (and hcd) */
1042 spin_lock_irqsave (&hcd_data_lock, flags);
1043 list_del_init (&urb->urb_list);
1044 spin_unlock_irqrestore (&hcd_data_lock, flags);
1048 /* may be called in any context with a valid urb->dev usecount
1049 * caller surrenders "ownership" of urb
1050 * expects usb_submit_urb() to have sanity checked and conditioned all
1053 int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
1056 struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
1057 struct usb_host_endpoint *ep;
1058 unsigned long flags;
1063 usbmon_urb_submit(&hcd->self, urb);
1066 * Atomically queue the urb, first to our records, then to the HCD.
1067 * Access to urb->status is controlled by urb->lock ... changes on
1068 * i/o completion (normal or fault) or unlinking.
1071 // FIXME: verify that quiescing hc works right (RH cleans up)
1073 spin_lock_irqsave (&hcd_data_lock, flags);
1074 ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out)
1075 [usb_pipeendpoint(urb->pipe)];
1078 else if (unlikely (urb->reject))
1080 else switch (hcd->state) {
1081 case HC_STATE_RUNNING:
1082 case HC_STATE_RESUMING:
1084 list_add_tail (&urb->urb_list, &ep->urb_list);
1087 case HC_STATE_SUSPENDED:
1088 /* HC upstream links (register access, wakeup signaling) can work
1089 * even when the downstream links (and DMA etc) are quiesced; let
1090 * usbcore talk to the root hub.
1092 if (hcd->self.controller->power.power_state.event == PM_EVENT_ON
1093 && urb->dev->parent == NULL)
1097 status = -ESHUTDOWN;
1100 spin_unlock_irqrestore (&hcd_data_lock, flags);
1102 INIT_LIST_HEAD (&urb->urb_list);
1103 usbmon_urb_submit_error(&hcd->self, urb, status);
1107 /* increment urb's reference count as part of giving it to the HCD
1108 * (which now controls it). HCD guarantees that it either returns
1109 * an error or calls giveback(), but not both.
1111 urb = usb_get_urb (urb);
1112 atomic_inc (&urb->use_count);
1114 if (urb->dev == hcd->self.root_hub) {
1115 /* NOTE: requirement on hub callers (usbfs and the hub
1116 * driver, for now) that URBs' urb->transfer_buffer be
1117 * valid and usb_buffer_{sync,unmap}() not be needed, since
1118 * they could clobber root hub response data.
1120 status = rh_urb_enqueue (hcd, urb);
1124 /* lower level hcd code should use *_dma exclusively,
1125 * unless it uses pio or talks to another transport.
1127 if (hcd->self.uses_dma) {
1128 if (usb_pipecontrol (urb->pipe)
1129 && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
1130 urb->setup_dma = dma_map_single (
1131 hcd->self.controller,
1133 sizeof (struct usb_ctrlrequest),
1135 if (urb->transfer_buffer_length != 0
1136 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP))
1137 urb->transfer_dma = dma_map_single (
1138 hcd->self.controller,
1139 urb->transfer_buffer,
1140 urb->transfer_buffer_length,
1141 usb_pipein (urb->pipe)
1146 status = hcd->driver->urb_enqueue (hcd, ep, urb, mem_flags);
1148 if (unlikely (status)) {
1150 atomic_dec (&urb->use_count);
1152 wake_up (&usb_kill_urb_queue);
1154 usbmon_urb_submit_error(&hcd->self, urb, status);
1159 /*-------------------------------------------------------------------------*/
1161 /* called in any context */
1162 int usb_hcd_get_frame_number (struct usb_device *udev)
1164 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
1166 if (!HC_IS_RUNNING (hcd->state))
1168 return hcd->driver->get_frame_number (hcd);
1171 /*-------------------------------------------------------------------------*/
1173 /* this makes the hcd giveback() the urb more quickly, by kicking it
1174 * off hardware queues (which may take a while) and returning it as
1175 * soon as practical. we've already set up the urb's return status,
1176 * but we can't know if the callback completed already.
1179 unlink1 (struct usb_hcd *hcd, struct urb *urb)
1183 if (urb->dev == hcd->self.root_hub)
1184 value = usb_rh_urb_dequeue (hcd, urb);
1187 /* The only reason an HCD might fail this call is if
1188 * it has not yet fully queued the urb to begin with.
1189 * Such failures should be harmless. */
1190 value = hcd->driver->urb_dequeue (hcd, urb);
1194 dev_dbg (hcd->self.controller, "dequeue %p --> %d\n",
1200 * called in any context
1202 * caller guarantees urb won't be recycled till both unlink()
1203 * and the urb's completion function return
1205 int usb_hcd_unlink_urb (struct urb *urb, int status)
1207 struct usb_host_endpoint *ep;
1208 struct usb_hcd *hcd = NULL;
1209 struct device *sys = NULL;
1210 unsigned long flags;
1211 struct list_head *tmp;
1216 if (!urb->dev || !urb->dev->bus)
1218 ep = (usb_pipein(urb->pipe) ? urb->dev->ep_in : urb->dev->ep_out)
1219 [usb_pipeendpoint(urb->pipe)];
1224 * we contend for urb->status with the hcd core,
1225 * which changes it while returning the urb.
1227 * Caller guaranteed that the urb pointer hasn't been freed, and
1228 * that it was submitted. But as a rule it can't know whether or
1229 * not it's already been unlinked ... so we respect the reversed
1230 * lock sequence needed for the usb_hcd_giveback_urb() code paths
1231 * (urb lock, then hcd_data_lock) in case some other CPU is now
1234 spin_lock_irqsave (&urb->lock, flags);
1235 spin_lock (&hcd_data_lock);
1237 sys = &urb->dev->dev;
1238 hcd = bus_to_hcd(urb->dev->bus);
1244 /* insist the urb is still queued */
1245 list_for_each(tmp, &ep->urb_list) {
1246 if (tmp == &urb->urb_list)
1249 if (tmp != &urb->urb_list) {
1254 /* Any status except -EINPROGRESS means something already started to
1255 * unlink this URB from the hardware. So there's no more work to do.
1257 if (urb->status != -EINPROGRESS) {
1262 /* IRQ setup can easily be broken so that USB controllers
1263 * never get completion IRQs ... maybe even the ones we need to
1264 * finish unlinking the initial failed usb_set_address()
1265 * or device descriptor fetch.
1267 if (!test_bit(HCD_FLAG_SAW_IRQ, &hcd->flags)
1268 && hcd->self.root_hub != urb->dev) {
1269 dev_warn (hcd->self.controller, "Unlink after no-IRQ? "
1270 "Controller is probably using the wrong IRQ."
1272 set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
1275 urb->status = status;
1277 spin_unlock (&hcd_data_lock);
1278 spin_unlock_irqrestore (&urb->lock, flags);
1280 retval = unlink1 (hcd, urb);
1282 retval = -EINPROGRESS;
1286 spin_unlock (&hcd_data_lock);
1287 spin_unlock_irqrestore (&urb->lock, flags);
1288 if (retval != -EIDRM && sys && sys->driver)
1289 dev_dbg (sys, "hcd_unlink_urb %p fail %d\n", urb, retval);
1293 /*-------------------------------------------------------------------------*/
1295 /* disables the endpoint: cancels any pending urbs, then synchronizes with
1296 * the hcd to make sure all endpoint state is gone from hardware, and then
1297 * waits until the endpoint's queue is completely drained. use for
1298 * set_configuration, set_interface, driver removal, physical disconnect.
1300 * example: a qh stored in ep->hcpriv, holding state related to endpoint
1301 * type, maxpacket size, toggle, halt status, and scheduling.
1303 void usb_hcd_endpoint_disable (struct usb_device *udev,
1304 struct usb_host_endpoint *ep)
1306 struct usb_hcd *hcd;
1309 hcd = bus_to_hcd(udev->bus);
1311 WARN_ON (!HC_IS_RUNNING (hcd->state) && hcd->state != HC_STATE_HALT &&
1312 udev->state != USB_STATE_NOTATTACHED);
1314 local_irq_disable ();
1316 /* ep is already gone from udev->ep_{in,out}[]; no more submits */
1318 spin_lock (&hcd_data_lock);
1319 list_for_each_entry (urb, &ep->urb_list, urb_list) {
1322 /* the urb may already have been unlinked */
1323 if (urb->status != -EINPROGRESS)
1326 spin_unlock (&hcd_data_lock);
1328 spin_lock (&urb->lock);
1330 if (tmp == -EINPROGRESS)
1331 urb->status = -ESHUTDOWN;
1332 spin_unlock (&urb->lock);
1334 /* kick hcd unless it's already returning this */
1335 if (tmp == -EINPROGRESS) {
1338 dev_dbg (hcd->self.controller,
1339 "shutdown urb %p pipe %08x ep%d%s%s\n",
1340 urb, tmp, usb_pipeendpoint (tmp),
1341 (tmp & USB_DIR_IN) ? "in" : "out",
1343 switch (usb_pipetype (tmp)) { \
1344 case PIPE_CONTROL: s = ""; break; \
1345 case PIPE_BULK: s = "-bulk"; break; \
1346 case PIPE_INTERRUPT: s = "-intr"; break; \
1347 default: s = "-iso"; break; \
1352 /* list contents may have changed */
1355 spin_unlock (&hcd_data_lock);
1356 local_irq_enable ();
1358 /* synchronize with the hardware, so old configuration state
1359 * clears out immediately (and will be freed).
1362 if (hcd->driver->endpoint_disable)
1363 hcd->driver->endpoint_disable (hcd, ep);
1365 /* Wait until the endpoint queue is completely empty. Most HCDs
1366 * will have done this already in their endpoint_disable method,
1367 * but some might not. And there could be root-hub control URBs
1368 * still pending since they aren't affected by the HCDs'
1369 * endpoint_disable methods.
1371 while (!list_empty (&ep->urb_list)) {
1372 spin_lock_irq (&hcd_data_lock);
1374 /* The list may have changed while we acquired the spinlock */
1376 if (!list_empty (&ep->urb_list)) {
1377 urb = list_entry (ep->urb_list.prev, struct urb,
1381 spin_unlock_irq (&hcd_data_lock);
1390 /*-------------------------------------------------------------------------*/
1394 int hcd_bus_suspend (struct usb_bus *bus)
1396 struct usb_hcd *hcd;
1399 hcd = container_of (bus, struct usb_hcd, self);
1400 if (!hcd->driver->bus_suspend)
1402 hcd->state = HC_STATE_QUIESCING;
1403 status = hcd->driver->bus_suspend (hcd);
1405 hcd->state = HC_STATE_SUSPENDED;
1407 dev_dbg(&bus->root_hub->dev, "%s fail, err %d\n",
1412 int hcd_bus_resume (struct usb_bus *bus)
1414 struct usb_hcd *hcd;
1417 hcd = container_of (bus, struct usb_hcd, self);
1418 if (!hcd->driver->bus_resume)
1420 if (hcd->state == HC_STATE_RUNNING)
1422 hcd->state = HC_STATE_RESUMING;
1423 status = hcd->driver->bus_resume (hcd);
1425 hcd->state = HC_STATE_RUNNING;
1427 dev_dbg(&bus->root_hub->dev, "%s fail, err %d\n",
1435 * usb_hcd_suspend_root_hub - HCD autosuspends downstream ports
1436 * @hcd: host controller for this root hub
1438 * This call arranges that usb_hcd_resume_root_hub() is safe to call later;
1439 * that the HCD's root hub polling is deactivated; and that the root's hub
1440 * driver is suspended. HCDs may call this to autosuspend when their root
1441 * hub's downstream ports are all inactive: unpowered, disconnected,
1442 * disabled, or suspended.
1444 * The HCD will autoresume on device connect change detection (using SRP
1445 * or a D+/D- pullup). The HCD also autoresumes on remote wakeup signaling
1446 * from any ports that are suspended (if that is enabled). In most cases,
1447 * overcurrent signaling (on powered ports) will also start autoresume.
1449 * Always called with IRQs blocked.
1451 void usb_hcd_suspend_root_hub (struct usb_hcd *hcd)
1455 spin_lock (&hcd_root_hub_lock);
1456 usb_suspend_root_hub (hcd->self.root_hub);
1458 /* force status urb to complete/unlink while suspended */
1459 if (hcd->status_urb) {
1460 urb = hcd->status_urb;
1461 urb->status = -ECONNRESET;
1463 urb->actual_length = 0;
1465 del_timer (&hcd->rh_timer);
1466 hcd->poll_pending = 0;
1467 hcd->status_urb = NULL;
1470 spin_unlock (&hcd_root_hub_lock);
1471 hcd->state = HC_STATE_SUSPENDED;
1474 usb_hcd_giveback_urb (hcd, urb, NULL);
1476 EXPORT_SYMBOL_GPL(usb_hcd_suspend_root_hub);
1479 * usb_hcd_resume_root_hub - called by HCD to resume its root hub
1480 * @hcd: host controller for this root hub
1482 * The USB host controller calls this function when its root hub is
1483 * suspended (with the remote wakeup feature enabled) and a remote
1484 * wakeup request is received. It queues a request for khubd to
1485 * resume the root hub (that is, manage its downstream ports again).
1487 void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
1489 unsigned long flags;
1491 spin_lock_irqsave (&hcd_root_hub_lock, flags);
1492 if (hcd->rh_registered)
1493 usb_resume_root_hub (hcd->self.root_hub);
1494 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
1496 EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);
1500 /*-------------------------------------------------------------------------*/
1502 #ifdef CONFIG_USB_OTG
1505 * usb_bus_start_enum - start immediate enumeration (for OTG)
1506 * @bus: the bus (must use hcd framework)
1507 * @port_num: 1-based number of port; usually bus->otg_port
1508 * Context: in_interrupt()
1510 * Starts enumeration, with an immediate reset followed later by
1511 * khubd identifying and possibly configuring the device.
1512 * This is needed by OTG controller drivers, where it helps meet
1513 * HNP protocol timing requirements for starting a port reset.
1515 int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num)
1517 struct usb_hcd *hcd;
1518 int status = -EOPNOTSUPP;
1520 /* NOTE: since HNP can't start by grabbing the bus's address0_sem,
1521 * boards with root hubs hooked up to internal devices (instead of
1522 * just the OTG port) may need more attention to resetting...
1524 hcd = container_of (bus, struct usb_hcd, self);
1525 if (port_num && hcd->driver->start_port_reset)
1526 status = hcd->driver->start_port_reset(hcd, port_num);
1528 /* run khubd shortly after (first) root port reset finishes;
1529 * it may issue others, until at least 50 msecs have passed.
1532 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10));
1535 EXPORT_SYMBOL (usb_bus_start_enum);
1539 /*-------------------------------------------------------------------------*/
1542 * usb_hcd_giveback_urb - return URB from HCD to device driver
1543 * @hcd: host controller returning the URB
1544 * @urb: urb being returned to the USB device driver.
1545 * @regs: pt_regs, passed down to the URB completion handler
1546 * Context: in_interrupt()
1548 * This hands the URB from HCD to its USB device driver, using its
1549 * completion function. The HCD has freed all per-urb resources
1550 * (and is done using urb->hcpriv). It also released all HCD locks;
1551 * the device driver won't cause problems if it frees, modifies,
1552 * or resubmits this URB.
1554 void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb, struct pt_regs *regs)
1558 at_root_hub = (urb->dev == hcd->self.root_hub);
1561 /* lower level hcd code should use *_dma exclusively if the
1562 * host controller does DMA */
1563 if (hcd->self.uses_dma && !at_root_hub) {
1564 if (usb_pipecontrol (urb->pipe)
1565 && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP))
1566 dma_unmap_single (hcd->self.controller, urb->setup_dma,
1567 sizeof (struct usb_ctrlrequest),
1569 if (urb->transfer_buffer_length != 0
1570 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP))
1571 dma_unmap_single (hcd->self.controller,
1573 urb->transfer_buffer_length,
1574 usb_pipein (urb->pipe)
1579 usbmon_urb_complete (&hcd->self, urb);
1580 /* pass ownership to the completion handler */
1581 urb->complete (urb, regs);
1582 atomic_dec (&urb->use_count);
1583 if (unlikely (urb->reject))
1584 wake_up (&usb_kill_urb_queue);
1587 EXPORT_SYMBOL (usb_hcd_giveback_urb);
1589 /*-------------------------------------------------------------------------*/
1592 * usb_hcd_irq - hook IRQs to HCD framework (bus glue)
1593 * @irq: the IRQ being raised
1594 * @__hcd: pointer to the HCD whose IRQ is being signaled
1595 * @r: saved hardware registers
1597 * If the controller isn't HALTed, calls the driver's irq handler.
1598 * Checks whether the controller is now dead.
1600 irqreturn_t usb_hcd_irq (int irq, void *__hcd, struct pt_regs * r)
1602 struct usb_hcd *hcd = __hcd;
1603 int start = hcd->state;
1605 if (unlikely(start == HC_STATE_HALT ||
1606 !test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
1608 if (hcd->driver->irq (hcd, r) == IRQ_NONE)
1611 set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
1613 if (unlikely(hcd->state == HC_STATE_HALT))
1618 /*-------------------------------------------------------------------------*/
1621 * usb_hc_died - report abnormal shutdown of a host controller (bus glue)
1622 * @hcd: pointer to the HCD representing the controller
1624 * This is called by bus glue to report a USB host controller that died
1625 * while operations may still have been pending. It's called automatically
1626 * by the PCI glue, so only glue for non-PCI busses should need to call it.
1628 void usb_hc_died (struct usb_hcd *hcd)
1630 unsigned long flags;
1632 dev_err (hcd->self.controller, "HC died; cleaning up\n");
1634 spin_lock_irqsave (&hcd_root_hub_lock, flags);
1635 if (hcd->rh_registered) {
1638 /* make khubd clean up old urbs and devices */
1639 usb_set_device_state (hcd->self.root_hub,
1640 USB_STATE_NOTATTACHED);
1641 usb_kick_khubd (hcd->self.root_hub);
1643 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
1645 EXPORT_SYMBOL_GPL (usb_hc_died);
1647 /*-------------------------------------------------------------------------*/
1650 * usb_create_hcd - create and initialize an HCD structure
1651 * @driver: HC driver that will use this hcd
1652 * @dev: device for this HC, stored in hcd->self.controller
1653 * @bus_name: value to store in hcd->self.bus_name
1654 * Context: !in_interrupt()
1656 * Allocate a struct usb_hcd, with extra space at the end for the
1657 * HC driver's private data. Initialize the generic members of the
1660 * If memory is unavailable, returns NULL.
1662 struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
1663 struct device *dev, char *bus_name)
1665 struct usb_hcd *hcd;
1667 hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
1669 dev_dbg (dev, "hcd alloc failed\n");
1672 dev_set_drvdata(dev, hcd);
1673 kref_init(&hcd->kref);
1675 usb_bus_init(&hcd->self);
1676 hcd->self.controller = dev;
1677 hcd->self.bus_name = bus_name;
1678 hcd->self.uses_dma = (dev->dma_mask != NULL);
1680 init_timer(&hcd->rh_timer);
1681 hcd->rh_timer.function = rh_timer_func;
1682 hcd->rh_timer.data = (unsigned long) hcd;
1684 hcd->driver = driver;
1685 hcd->product_desc = (driver->product_desc) ? driver->product_desc :
1686 "USB Host Controller";
1690 EXPORT_SYMBOL (usb_create_hcd);
1692 static void hcd_release (struct kref *kref)
1694 struct usb_hcd *hcd = container_of (kref, struct usb_hcd, kref);
1699 struct usb_hcd *usb_get_hcd (struct usb_hcd *hcd)
1702 kref_get (&hcd->kref);
1705 EXPORT_SYMBOL (usb_get_hcd);
1707 void usb_put_hcd (struct usb_hcd *hcd)
1710 kref_put (&hcd->kref, hcd_release);
1712 EXPORT_SYMBOL (usb_put_hcd);
1715 * usb_add_hcd - finish generic HCD structure initialization and register
1716 * @hcd: the usb_hcd structure to initialize
1717 * @irqnum: Interrupt line to allocate
1718 * @irqflags: Interrupt type flags
1720 * Finish the remaining parts of generic HCD initialization: allocate the
1721 * buffers of consistent memory, register the bus, request the IRQ line,
1722 * and call the driver's reset() and start() routines.
1724 int usb_add_hcd(struct usb_hcd *hcd,
1725 unsigned int irqnum, unsigned long irqflags)
1728 struct usb_device *rhdev;
1730 dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
1732 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1734 /* HC is in reset state, but accessible. Now do the one-time init,
1735 * bottom up so that hcds can customize the root hubs before khubd
1736 * starts talking to them. (Note, bus id is assigned early too.)
1738 if ((retval = hcd_buffer_create(hcd)) != 0) {
1739 dev_dbg(hcd->self.controller, "pool alloc failed\n");
1743 if ((retval = usb_register_bus(&hcd->self)) < 0)
1744 goto err_register_bus;
1746 if ((rhdev = usb_alloc_dev(NULL, &hcd->self, 0)) == NULL) {
1747 dev_err(hcd->self.controller, "unable to allocate root hub\n");
1749 goto err_allocate_root_hub;
1751 rhdev->speed = (hcd->driver->flags & HCD_USB2) ? USB_SPEED_HIGH :
1753 hcd->self.root_hub = rhdev;
1755 /* wakeup flag init defaults to "everything works" for root hubs,
1756 * but drivers can override it in reset() if needed, along with
1757 * recording the overall controller's system wakeup capability.
1759 device_init_wakeup(&rhdev->dev, 1);
1761 /* "reset" is misnamed; its role is now one-time init. the controller
1762 * should already have been reset (and boot firmware kicked off etc).
1764 if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) {
1765 dev_err(hcd->self.controller, "can't setup\n");
1766 goto err_hcd_driver_setup;
1769 /* NOTE: root hub and controller capabilities may not be the same */
1770 if (device_can_wakeup(hcd->self.controller)
1771 && device_can_wakeup(&hcd->self.root_hub->dev))
1772 dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
1774 /* enable irqs just before we start the controller */
1775 if (hcd->driver->irq) {
1776 snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
1777 hcd->driver->description, hcd->self.busnum);
1778 if ((retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
1779 hcd->irq_descr, hcd)) != 0) {
1780 dev_err(hcd->self.controller,
1781 "request interrupt %d failed\n", irqnum);
1782 goto err_request_irq;
1785 dev_info(hcd->self.controller, "irq %d, %s 0x%08llx\n", irqnum,
1786 (hcd->driver->flags & HCD_MEMORY) ?
1787 "io mem" : "io base",
1788 (unsigned long long)hcd->rsrc_start);
1791 if (hcd->rsrc_start)
1792 dev_info(hcd->self.controller, "%s 0x%08llx\n",
1793 (hcd->driver->flags & HCD_MEMORY) ?
1794 "io mem" : "io base",
1795 (unsigned long long)hcd->rsrc_start);
1798 if ((retval = hcd->driver->start(hcd)) < 0) {
1799 dev_err(hcd->self.controller, "startup error %d\n", retval);
1800 goto err_hcd_driver_start;
1803 /* starting here, usbcore will pay attention to this root hub */
1804 rhdev->bus_mA = min(500u, hcd->power_budget);
1805 if ((retval = register_root_hub(hcd)) != 0)
1806 goto err_register_root_hub;
1808 if (hcd->uses_new_polling && hcd->poll_rh)
1809 usb_hcd_poll_rh_status(hcd);
1812 err_register_root_hub:
1813 hcd->driver->stop(hcd);
1814 err_hcd_driver_start:
1816 free_irq(irqnum, hcd);
1818 err_hcd_driver_setup:
1819 hcd->self.root_hub = NULL;
1821 err_allocate_root_hub:
1822 usb_deregister_bus(&hcd->self);
1824 hcd_buffer_destroy(hcd);
1827 EXPORT_SYMBOL (usb_add_hcd);
1830 * usb_remove_hcd - shutdown processing for generic HCDs
1831 * @hcd: the usb_hcd structure to remove
1832 * Context: !in_interrupt()
1834 * Disconnects the root hub, then reverses the effects of usb_add_hcd(),
1835 * invoking the HCD's stop() method.
1837 void usb_remove_hcd(struct usb_hcd *hcd)
1839 dev_info(hcd->self.controller, "remove, state %x\n", hcd->state);
1841 if (HC_IS_RUNNING (hcd->state))
1842 hcd->state = HC_STATE_QUIESCING;
1844 dev_dbg(hcd->self.controller, "roothub graceful disconnect\n");
1845 spin_lock_irq (&hcd_root_hub_lock);
1846 hcd->rh_registered = 0;
1847 spin_unlock_irq (&hcd_root_hub_lock);
1849 mutex_lock(&usb_bus_list_lock);
1850 usb_disconnect(&hcd->self.root_hub);
1851 mutex_unlock(&usb_bus_list_lock);
1854 del_timer_sync(&hcd->rh_timer);
1856 hcd->driver->stop(hcd);
1857 hcd->state = HC_STATE_HALT;
1860 free_irq(hcd->irq, hcd);
1861 usb_deregister_bus(&hcd->self);
1862 hcd_buffer_destroy(hcd);
1864 EXPORT_SYMBOL (usb_remove_hcd);
1867 usb_hcd_platform_shutdown(struct platform_device* dev)
1869 struct usb_hcd *hcd = platform_get_drvdata(dev);
1871 if (hcd->driver->shutdown)
1872 hcd->driver->shutdown(hcd);
1874 EXPORT_SYMBOL (usb_hcd_platform_shutdown);
1876 /*-------------------------------------------------------------------------*/
1878 #if defined(CONFIG_USB_MON)
1880 struct usb_mon_operations *mon_ops;
1883 * The registration is unlocked.
1884 * We do it this way because we do not want to lock in hot paths.
1886 * Notice that the code is minimally error-proof. Because usbmon needs
1887 * symbols from usbcore, usbcore gets referenced and cannot be unloaded first.
1890 int usb_mon_register (struct usb_mon_operations *ops)
1900 EXPORT_SYMBOL_GPL (usb_mon_register);
1902 void usb_mon_deregister (void)
1905 if (mon_ops == NULL) {
1906 printk(KERN_ERR "USB: monitor was not registered\n");
1912 EXPORT_SYMBOL_GPL (usb_mon_deregister);
1914 #endif /* CONFIG_USB_MON */