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 <linux/device.h>
34 #include <linux/dma-mapping.h>
35 #include <linux/mutex.h>
37 #include <asm/byteorder.h>
38 #include <asm/unaligned.h>
39 #include <linux/platform_device.h>
40 #include <linux/workqueue.h>
41 #include <linux/pm_runtime.h>
43 #include <linux/usb.h>
44 #include <linux/usb/hcd.h>
49 /*-------------------------------------------------------------------------*/
52 * USB Host Controller Driver framework
54 * Plugs into usbcore (usb_bus) and lets HCDs share code, minimizing
55 * HCD-specific behaviors/bugs.
57 * This does error checks, tracks devices and urbs, and delegates to a
58 * "hc_driver" only for code (and data) that really needs to know about
59 * hardware differences. That includes root hub registers, i/o queues,
60 * and so on ... but as little else as possible.
62 * Shared code includes most of the "root hub" code (these are emulated,
63 * though each HC's hardware works differently) and PCI glue, plus request
64 * tracking overhead. The HCD code should only block on spinlocks or on
65 * hardware handshaking; blocking on software events (such as other kernel
66 * threads releasing resources, or completing actions) is all generic.
68 * Happens the USB 2.0 spec says this would be invisible inside the "USBD",
69 * and includes mostly a "HCDI" (HCD Interface) along with some APIs used
70 * only by the hub driver ... and that neither should be seen or used by
71 * usb client device drivers.
73 * Contributors of ideas or unattributed patches include: David Brownell,
74 * Roman Weissgaerber, Rory Bolt, Greg Kroah-Hartman, ...
77 * 2002-02-21 Pull in most of the usb_bus support from usb.c; some
78 * associated cleanup. "usb_hcd" still != "usb_bus".
79 * 2001-12-12 Initial patch version for Linux 2.5.1 kernel.
82 /*-------------------------------------------------------------------------*/
84 /* Keep track of which host controller drivers are loaded */
85 unsigned long usb_hcds_loaded;
86 EXPORT_SYMBOL_GPL(usb_hcds_loaded);
88 /* host controllers we manage */
89 LIST_HEAD (usb_bus_list);
90 EXPORT_SYMBOL_GPL (usb_bus_list);
92 /* used when allocating bus numbers */
95 unsigned long busmap [USB_MAXBUS / (8*sizeof (unsigned long))];
97 static struct usb_busmap busmap;
99 /* used when updating list of hcds */
100 DEFINE_MUTEX(usb_bus_list_lock); /* exported only for usbfs */
101 EXPORT_SYMBOL_GPL (usb_bus_list_lock);
103 /* used for controlling access to virtual root hubs */
104 static DEFINE_SPINLOCK(hcd_root_hub_lock);
106 /* used when updating an endpoint's URB list */
107 static DEFINE_SPINLOCK(hcd_urb_list_lock);
109 /* used to protect against unlinking URBs after the device is gone */
110 static DEFINE_SPINLOCK(hcd_urb_unlink_lock);
112 /* wait queue for synchronous unlinks */
113 DECLARE_WAIT_QUEUE_HEAD(usb_kill_urb_queue);
115 static inline int is_root_hub(struct usb_device *udev)
117 return (udev->parent == NULL);
120 /*-------------------------------------------------------------------------*/
123 * Sharable chunks of root hub code.
126 /*-------------------------------------------------------------------------*/
128 #define KERNEL_REL ((LINUX_VERSION_CODE >> 16) & 0x0ff)
129 #define KERNEL_VER ((LINUX_VERSION_CODE >> 8) & 0x0ff)
131 /* usb 3.0 root hub device descriptor */
132 static const u8 usb3_rh_dev_descriptor[18] = {
133 0x12, /* __u8 bLength; */
134 0x01, /* __u8 bDescriptorType; Device */
135 0x00, 0x03, /* __le16 bcdUSB; v3.0 */
137 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
138 0x00, /* __u8 bDeviceSubClass; */
139 0x03, /* __u8 bDeviceProtocol; USB 3.0 hub */
140 0x09, /* __u8 bMaxPacketSize0; 2^9 = 512 Bytes */
142 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation */
143 0x03, 0x00, /* __le16 idProduct; device 0x0003 */
144 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
146 0x03, /* __u8 iManufacturer; */
147 0x02, /* __u8 iProduct; */
148 0x01, /* __u8 iSerialNumber; */
149 0x01 /* __u8 bNumConfigurations; */
152 /* usb 2.0 root hub device descriptor */
153 static const u8 usb2_rh_dev_descriptor [18] = {
154 0x12, /* __u8 bLength; */
155 0x01, /* __u8 bDescriptorType; Device */
156 0x00, 0x02, /* __le16 bcdUSB; v2.0 */
158 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
159 0x00, /* __u8 bDeviceSubClass; */
160 0x00, /* __u8 bDeviceProtocol; [ usb 2.0 no TT ] */
161 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
163 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation */
164 0x02, 0x00, /* __le16 idProduct; device 0x0002 */
165 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
167 0x03, /* __u8 iManufacturer; */
168 0x02, /* __u8 iProduct; */
169 0x01, /* __u8 iSerialNumber; */
170 0x01 /* __u8 bNumConfigurations; */
173 /* no usb 2.0 root hub "device qualifier" descriptor: one speed only */
175 /* usb 1.1 root hub device descriptor */
176 static const u8 usb11_rh_dev_descriptor [18] = {
177 0x12, /* __u8 bLength; */
178 0x01, /* __u8 bDescriptorType; Device */
179 0x10, 0x01, /* __le16 bcdUSB; v1.1 */
181 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
182 0x00, /* __u8 bDeviceSubClass; */
183 0x00, /* __u8 bDeviceProtocol; [ low/full speeds only ] */
184 0x40, /* __u8 bMaxPacketSize0; 64 Bytes */
186 0x6b, 0x1d, /* __le16 idVendor; Linux Foundation */
187 0x01, 0x00, /* __le16 idProduct; device 0x0001 */
188 KERNEL_VER, KERNEL_REL, /* __le16 bcdDevice */
190 0x03, /* __u8 iManufacturer; */
191 0x02, /* __u8 iProduct; */
192 0x01, /* __u8 iSerialNumber; */
193 0x01 /* __u8 bNumConfigurations; */
197 /*-------------------------------------------------------------------------*/
199 /* Configuration descriptors for our root hubs */
201 static const u8 fs_rh_config_descriptor [] = {
203 /* one configuration */
204 0x09, /* __u8 bLength; */
205 0x02, /* __u8 bDescriptorType; Configuration */
206 0x19, 0x00, /* __le16 wTotalLength; */
207 0x01, /* __u8 bNumInterfaces; (1) */
208 0x01, /* __u8 bConfigurationValue; */
209 0x00, /* __u8 iConfiguration; */
210 0xc0, /* __u8 bmAttributes;
215 0x00, /* __u8 MaxPower; */
218 * USB 2.0, single TT organization (mandatory):
219 * one interface, protocol 0
221 * USB 2.0, multiple TT organization (optional):
222 * two interfaces, protocols 1 (like single TT)
223 * and 2 (multiple TT mode) ... config is
229 0x09, /* __u8 if_bLength; */
230 0x04, /* __u8 if_bDescriptorType; Interface */
231 0x00, /* __u8 if_bInterfaceNumber; */
232 0x00, /* __u8 if_bAlternateSetting; */
233 0x01, /* __u8 if_bNumEndpoints; */
234 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
235 0x00, /* __u8 if_bInterfaceSubClass; */
236 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
237 0x00, /* __u8 if_iInterface; */
239 /* one endpoint (status change endpoint) */
240 0x07, /* __u8 ep_bLength; */
241 0x05, /* __u8 ep_bDescriptorType; Endpoint */
242 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
243 0x03, /* __u8 ep_bmAttributes; Interrupt */
244 0x02, 0x00, /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8) */
245 0xff /* __u8 ep_bInterval; (255ms -- usb 2.0 spec) */
248 static const u8 hs_rh_config_descriptor [] = {
250 /* one configuration */
251 0x09, /* __u8 bLength; */
252 0x02, /* __u8 bDescriptorType; Configuration */
253 0x19, 0x00, /* __le16 wTotalLength; */
254 0x01, /* __u8 bNumInterfaces; (1) */
255 0x01, /* __u8 bConfigurationValue; */
256 0x00, /* __u8 iConfiguration; */
257 0xc0, /* __u8 bmAttributes;
262 0x00, /* __u8 MaxPower; */
265 * USB 2.0, single TT organization (mandatory):
266 * one interface, protocol 0
268 * USB 2.0, multiple TT organization (optional):
269 * two interfaces, protocols 1 (like single TT)
270 * and 2 (multiple TT mode) ... config is
276 0x09, /* __u8 if_bLength; */
277 0x04, /* __u8 if_bDescriptorType; Interface */
278 0x00, /* __u8 if_bInterfaceNumber; */
279 0x00, /* __u8 if_bAlternateSetting; */
280 0x01, /* __u8 if_bNumEndpoints; */
281 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
282 0x00, /* __u8 if_bInterfaceSubClass; */
283 0x00, /* __u8 if_bInterfaceProtocol; [usb1.1 or single tt] */
284 0x00, /* __u8 if_iInterface; */
286 /* one endpoint (status change endpoint) */
287 0x07, /* __u8 ep_bLength; */
288 0x05, /* __u8 ep_bDescriptorType; Endpoint */
289 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
290 0x03, /* __u8 ep_bmAttributes; Interrupt */
291 /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
292 * see hub.c:hub_configure() for details. */
293 (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
294 0x0c /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
297 static const u8 ss_rh_config_descriptor[] = {
298 /* one configuration */
299 0x09, /* __u8 bLength; */
300 0x02, /* __u8 bDescriptorType; Configuration */
301 0x19, 0x00, /* __le16 wTotalLength; FIXME */
302 0x01, /* __u8 bNumInterfaces; (1) */
303 0x01, /* __u8 bConfigurationValue; */
304 0x00, /* __u8 iConfiguration; */
305 0xc0, /* __u8 bmAttributes;
310 0x00, /* __u8 MaxPower; */
313 0x09, /* __u8 if_bLength; */
314 0x04, /* __u8 if_bDescriptorType; Interface */
315 0x00, /* __u8 if_bInterfaceNumber; */
316 0x00, /* __u8 if_bAlternateSetting; */
317 0x01, /* __u8 if_bNumEndpoints; */
318 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
319 0x00, /* __u8 if_bInterfaceSubClass; */
320 0x00, /* __u8 if_bInterfaceProtocol; */
321 0x00, /* __u8 if_iInterface; */
323 /* one endpoint (status change endpoint) */
324 0x07, /* __u8 ep_bLength; */
325 0x05, /* __u8 ep_bDescriptorType; Endpoint */
326 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
327 0x03, /* __u8 ep_bmAttributes; Interrupt */
328 /* __le16 ep_wMaxPacketSize; 1 + (MAX_ROOT_PORTS / 8)
329 * see hub.c:hub_configure() for details. */
330 (USB_MAXCHILDREN + 1 + 7) / 8, 0x00,
331 0x0c /* __u8 ep_bInterval; (256ms -- usb 2.0 spec) */
333 * All 3.0 hubs should have an endpoint companion descriptor,
334 * but we're ignoring that for now. FIXME?
338 /*-------------------------------------------------------------------------*/
341 * ascii2desc() - Helper routine for producing UTF-16LE string descriptors
342 * @s: Null-terminated ASCII (actually ISO-8859-1) string
343 * @buf: Buffer for USB string descriptor (header + UTF-16LE)
344 * @len: Length (in bytes; may be odd) of descriptor buffer.
346 * The return value is the number of bytes filled in: 2 + 2*strlen(s) or
347 * buflen, whichever is less.
349 * USB String descriptors can contain at most 126 characters; input
350 * strings longer than that are truncated.
353 ascii2desc(char const *s, u8 *buf, unsigned len)
355 unsigned n, t = 2 + 2*strlen(s);
358 t = 254; /* Longest possible UTF string descriptor */
362 t += USB_DT_STRING << 8; /* Now t is first 16 bits to store */
370 t = (unsigned char)*s++;
376 * rh_string() - provides string descriptors for root hub
377 * @id: the string ID number (0: langids, 1: serial #, 2: product, 3: vendor)
378 * @hcd: the host controller for this root hub
379 * @data: buffer for output packet
380 * @len: length of the provided buffer
382 * Produces either a manufacturer, product or serial number string for the
383 * virtual root hub device.
384 * Returns the number of bytes filled in: the length of the descriptor or
385 * of the provided buffer, whichever is less.
388 rh_string(int id, struct usb_hcd const *hcd, u8 *data, unsigned len)
392 static char const langids[4] = {4, USB_DT_STRING, 0x09, 0x04};
397 /* Array of LANGID codes (0x0409 is MSFT-speak for "en-us") */
398 /* See http://www.usb.org/developers/docs/USB_LANGIDs.pdf */
401 memcpy(data, langids, len);
405 s = hcd->self.bus_name;
409 s = hcd->product_desc;
413 snprintf (buf, sizeof buf, "%s %s %s", init_utsname()->sysname,
414 init_utsname()->release, hcd->driver->description);
418 /* Can't happen; caller guarantees it */
422 return ascii2desc(s, data, len);
426 /* Root hub control transfers execute synchronously */
427 static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
429 struct usb_ctrlrequest *cmd;
430 u16 typeReq, wValue, wIndex, wLength;
431 u8 *ubuf = urb->transfer_buffer;
432 u8 tbuf [sizeof (struct usb_hub_descriptor)]
433 __attribute__((aligned(4)));
434 const u8 *bufp = tbuf;
438 u8 patch_protocol = 0;
442 spin_lock_irq(&hcd_root_hub_lock);
443 status = usb_hcd_link_urb_to_ep(hcd, urb);
444 spin_unlock_irq(&hcd_root_hub_lock);
447 urb->hcpriv = hcd; /* Indicate it's queued */
449 cmd = (struct usb_ctrlrequest *) urb->setup_packet;
450 typeReq = (cmd->bRequestType << 8) | cmd->bRequest;
451 wValue = le16_to_cpu (cmd->wValue);
452 wIndex = le16_to_cpu (cmd->wIndex);
453 wLength = le16_to_cpu (cmd->wLength);
455 if (wLength > urb->transfer_buffer_length)
458 urb->actual_length = 0;
461 /* DEVICE REQUESTS */
463 /* The root hub's remote wakeup enable bit is implemented using
464 * driver model wakeup flags. If this system supports wakeup
465 * through USB, userspace may change the default "allow wakeup"
466 * policy through sysfs or these calls.
468 * Most root hubs support wakeup from downstream devices, for
469 * runtime power management (disabling USB clocks and reducing
470 * VBUS power usage). However, not all of them do so; silicon,
471 * board, and BIOS bugs here are not uncommon, so these can't
472 * be treated quite like external hubs.
474 * Likewise, not all root hubs will pass wakeup events upstream,
475 * to wake up the whole system. So don't assume root hub and
476 * controller capabilities are identical.
479 case DeviceRequest | USB_REQ_GET_STATUS:
480 tbuf [0] = (device_may_wakeup(&hcd->self.root_hub->dev)
481 << USB_DEVICE_REMOTE_WAKEUP)
482 | (1 << USB_DEVICE_SELF_POWERED);
486 case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
487 if (wValue == USB_DEVICE_REMOTE_WAKEUP)
488 device_set_wakeup_enable(&hcd->self.root_hub->dev, 0);
492 case DeviceOutRequest | USB_REQ_SET_FEATURE:
493 if (device_can_wakeup(&hcd->self.root_hub->dev)
494 && wValue == USB_DEVICE_REMOTE_WAKEUP)
495 device_set_wakeup_enable(&hcd->self.root_hub->dev, 1);
499 case DeviceRequest | USB_REQ_GET_CONFIGURATION:
503 case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
505 case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
506 switch (wValue & 0xff00) {
507 case USB_DT_DEVICE << 8:
508 switch (hcd->driver->flags & HCD_MASK) {
510 bufp = usb3_rh_dev_descriptor;
513 bufp = usb2_rh_dev_descriptor;
516 bufp = usb11_rh_dev_descriptor;
525 case USB_DT_CONFIG << 8:
526 switch (hcd->driver->flags & HCD_MASK) {
528 bufp = ss_rh_config_descriptor;
529 len = sizeof ss_rh_config_descriptor;
532 bufp = hs_rh_config_descriptor;
533 len = sizeof hs_rh_config_descriptor;
536 bufp = fs_rh_config_descriptor;
537 len = sizeof fs_rh_config_descriptor;
542 if (device_can_wakeup(&hcd->self.root_hub->dev))
545 case USB_DT_STRING << 8:
546 if ((wValue & 0xff) < 4)
547 urb->actual_length = rh_string(wValue & 0xff,
549 else /* unsupported IDs --> "protocol stall" */
556 case DeviceRequest | USB_REQ_GET_INTERFACE:
560 case DeviceOutRequest | USB_REQ_SET_INTERFACE:
562 case DeviceOutRequest | USB_REQ_SET_ADDRESS:
563 // wValue == urb->dev->devaddr
564 dev_dbg (hcd->self.controller, "root hub device address %d\n",
568 /* INTERFACE REQUESTS (no defined feature/status flags) */
570 /* ENDPOINT REQUESTS */
572 case EndpointRequest | USB_REQ_GET_STATUS:
573 // ENDPOINT_HALT flag
578 case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
579 case EndpointOutRequest | USB_REQ_SET_FEATURE:
580 dev_dbg (hcd->self.controller, "no endpoint features yet\n");
583 /* CLASS REQUESTS (and errors) */
586 /* non-generic request */
592 case GetHubDescriptor:
593 len = sizeof (struct usb_hub_descriptor);
596 status = hcd->driver->hub_control (hcd,
597 typeReq, wValue, wIndex,
601 /* "protocol stall" on error */
607 if (status != -EPIPE) {
608 dev_dbg (hcd->self.controller,
609 "CTRL: TypeReq=0x%x val=0x%x "
610 "idx=0x%x len=%d ==> %d\n",
611 typeReq, wValue, wIndex,
616 if (urb->transfer_buffer_length < len)
617 len = urb->transfer_buffer_length;
618 urb->actual_length = len;
619 // always USB_DIR_IN, toward host
620 memcpy (ubuf, bufp, len);
622 /* report whether RH hardware supports remote wakeup */
624 len > offsetof (struct usb_config_descriptor,
626 ((struct usb_config_descriptor *)ubuf)->bmAttributes
627 |= USB_CONFIG_ATT_WAKEUP;
629 /* report whether RH hardware has an integrated TT */
630 if (patch_protocol &&
631 len > offsetof(struct usb_device_descriptor,
633 ((struct usb_device_descriptor *) ubuf)->
637 /* any errors get returned through the urb completion */
638 spin_lock_irq(&hcd_root_hub_lock);
639 usb_hcd_unlink_urb_from_ep(hcd, urb);
641 /* This peculiar use of spinlocks echoes what real HC drivers do.
642 * Avoiding calls to local_irq_disable/enable makes the code
645 spin_unlock(&hcd_root_hub_lock);
646 usb_hcd_giveback_urb(hcd, urb, status);
647 spin_lock(&hcd_root_hub_lock);
649 spin_unlock_irq(&hcd_root_hub_lock);
653 /*-------------------------------------------------------------------------*/
656 * Root Hub interrupt transfers are polled using a timer if the
657 * driver requests it; otherwise the driver is responsible for
658 * calling usb_hcd_poll_rh_status() when an event occurs.
660 * Completions are called in_interrupt(), but they may or may not
663 void usb_hcd_poll_rh_status(struct usb_hcd *hcd)
668 char buffer[6]; /* Any root hubs with > 31 ports? */
670 if (unlikely(!hcd->rh_pollable))
672 if (!hcd->uses_new_polling && !hcd->status_urb)
675 length = hcd->driver->hub_status_data(hcd, buffer);
678 /* try to complete the status urb */
679 spin_lock_irqsave(&hcd_root_hub_lock, flags);
680 urb = hcd->status_urb;
682 clear_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
683 hcd->status_urb = NULL;
684 urb->actual_length = length;
685 memcpy(urb->transfer_buffer, buffer, length);
687 usb_hcd_unlink_urb_from_ep(hcd, urb);
688 spin_unlock(&hcd_root_hub_lock);
689 usb_hcd_giveback_urb(hcd, urb, 0);
690 spin_lock(&hcd_root_hub_lock);
693 set_bit(HCD_FLAG_POLL_PENDING, &hcd->flags);
695 spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
698 /* The USB 2.0 spec says 256 ms. This is close enough and won't
699 * exceed that limit if HZ is 100. The math is more clunky than
700 * maybe expected, this is to make sure that all timers for USB devices
701 * fire at the same time to give the CPU a break inbetween */
702 if (hcd->uses_new_polling ? HCD_POLL_RH(hcd) :
703 (length == 0 && hcd->status_urb != NULL))
704 mod_timer (&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
706 EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status);
709 static void rh_timer_func (unsigned long _hcd)
711 usb_hcd_poll_rh_status((struct usb_hcd *) _hcd);
714 /*-------------------------------------------------------------------------*/
716 static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb)
720 unsigned len = 1 + (urb->dev->maxchild / 8);
722 spin_lock_irqsave (&hcd_root_hub_lock, flags);
723 if (hcd->status_urb || urb->transfer_buffer_length < len) {
724 dev_dbg (hcd->self.controller, "not queuing rh status urb\n");
729 retval = usb_hcd_link_urb_to_ep(hcd, urb);
733 hcd->status_urb = urb;
734 urb->hcpriv = hcd; /* indicate it's queued */
735 if (!hcd->uses_new_polling)
736 mod_timer(&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4));
738 /* If a status change has already occurred, report it ASAP */
739 else if (HCD_POLL_PENDING(hcd))
740 mod_timer(&hcd->rh_timer, jiffies);
743 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
747 static int rh_urb_enqueue (struct usb_hcd *hcd, struct urb *urb)
749 if (usb_endpoint_xfer_int(&urb->ep->desc))
750 return rh_queue_status (hcd, urb);
751 if (usb_endpoint_xfer_control(&urb->ep->desc))
752 return rh_call_control (hcd, urb);
756 /*-------------------------------------------------------------------------*/
758 /* Unlinks of root-hub control URBs are legal, but they don't do anything
759 * since these URBs always execute synchronously.
761 static int usb_rh_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
766 spin_lock_irqsave(&hcd_root_hub_lock, flags);
767 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
771 if (usb_endpoint_num(&urb->ep->desc) == 0) { /* Control URB */
774 } else { /* Status URB */
775 if (!hcd->uses_new_polling)
776 del_timer (&hcd->rh_timer);
777 if (urb == hcd->status_urb) {
778 hcd->status_urb = NULL;
779 usb_hcd_unlink_urb_from_ep(hcd, urb);
781 spin_unlock(&hcd_root_hub_lock);
782 usb_hcd_giveback_urb(hcd, urb, status);
783 spin_lock(&hcd_root_hub_lock);
787 spin_unlock_irqrestore(&hcd_root_hub_lock, flags);
794 * Show & store the current value of authorized_default
796 static ssize_t usb_host_authorized_default_show(struct device *dev,
797 struct device_attribute *attr,
800 struct usb_device *rh_usb_dev = to_usb_device(dev);
801 struct usb_bus *usb_bus = rh_usb_dev->bus;
802 struct usb_hcd *usb_hcd;
804 if (usb_bus == NULL) /* FIXME: not sure if this case is possible */
806 usb_hcd = bus_to_hcd(usb_bus);
807 return snprintf(buf, PAGE_SIZE, "%u\n", usb_hcd->authorized_default);
810 static ssize_t usb_host_authorized_default_store(struct device *dev,
811 struct device_attribute *attr,
812 const char *buf, size_t size)
816 struct usb_device *rh_usb_dev = to_usb_device(dev);
817 struct usb_bus *usb_bus = rh_usb_dev->bus;
818 struct usb_hcd *usb_hcd;
820 if (usb_bus == NULL) /* FIXME: not sure if this case is possible */
822 usb_hcd = bus_to_hcd(usb_bus);
823 result = sscanf(buf, "%u\n", &val);
825 usb_hcd->authorized_default = val? 1 : 0;
833 static DEVICE_ATTR(authorized_default, 0644,
834 usb_host_authorized_default_show,
835 usb_host_authorized_default_store);
838 /* Group all the USB bus attributes */
839 static struct attribute *usb_bus_attrs[] = {
840 &dev_attr_authorized_default.attr,
844 static struct attribute_group usb_bus_attr_group = {
845 .name = NULL, /* we want them in the same directory */
846 .attrs = usb_bus_attrs,
851 /*-------------------------------------------------------------------------*/
854 * usb_bus_init - shared initialization code
855 * @bus: the bus structure being initialized
857 * This code is used to initialize a usb_bus structure, memory for which is
858 * separately managed.
860 static void usb_bus_init (struct usb_bus *bus)
862 memset (&bus->devmap, 0, sizeof(struct usb_devmap));
864 bus->devnum_next = 1;
866 bus->root_hub = NULL;
868 bus->bandwidth_allocated = 0;
869 bus->bandwidth_int_reqs = 0;
870 bus->bandwidth_isoc_reqs = 0;
872 INIT_LIST_HEAD (&bus->bus_list);
875 /*-------------------------------------------------------------------------*/
878 * usb_register_bus - registers the USB host controller with the usb core
879 * @bus: pointer to the bus to register
880 * Context: !in_interrupt()
882 * Assigns a bus number, and links the controller into usbcore data
883 * structures so that it can be seen by scanning the bus list.
885 static int usb_register_bus(struct usb_bus *bus)
890 mutex_lock(&usb_bus_list_lock);
891 busnum = find_next_zero_bit (busmap.busmap, USB_MAXBUS, 1);
892 if (busnum >= USB_MAXBUS) {
893 printk (KERN_ERR "%s: too many buses\n", usbcore_name);
894 goto error_find_busnum;
896 set_bit (busnum, busmap.busmap);
897 bus->busnum = busnum;
899 /* Add it to the local list of buses */
900 list_add (&bus->bus_list, &usb_bus_list);
901 mutex_unlock(&usb_bus_list_lock);
903 usb_notify_add_bus(bus);
905 dev_info (bus->controller, "new USB bus registered, assigned bus "
906 "number %d\n", bus->busnum);
910 mutex_unlock(&usb_bus_list_lock);
915 * usb_deregister_bus - deregisters the USB host controller
916 * @bus: pointer to the bus to deregister
917 * Context: !in_interrupt()
919 * Recycles the bus number, and unlinks the controller from usbcore data
920 * structures so that it won't be seen by scanning the bus list.
922 static void usb_deregister_bus (struct usb_bus *bus)
924 dev_info (bus->controller, "USB bus %d deregistered\n", bus->busnum);
927 * NOTE: make sure that all the devices are removed by the
928 * controller code, as well as having it call this when cleaning
931 mutex_lock(&usb_bus_list_lock);
932 list_del (&bus->bus_list);
933 mutex_unlock(&usb_bus_list_lock);
935 usb_notify_remove_bus(bus);
937 clear_bit (bus->busnum, busmap.busmap);
941 * register_root_hub - called by usb_add_hcd() to register a root hub
942 * @hcd: host controller for this root hub
944 * This function registers the root hub with the USB subsystem. It sets up
945 * the device properly in the device tree and then calls usb_new_device()
946 * to register the usb device. It also assigns the root hub's USB address
949 static int register_root_hub(struct usb_hcd *hcd)
951 struct device *parent_dev = hcd->self.controller;
952 struct usb_device *usb_dev = hcd->self.root_hub;
953 const int devnum = 1;
956 usb_dev->devnum = devnum;
957 usb_dev->bus->devnum_next = devnum + 1;
958 memset (&usb_dev->bus->devmap.devicemap, 0,
959 sizeof usb_dev->bus->devmap.devicemap);
960 set_bit (devnum, usb_dev->bus->devmap.devicemap);
961 usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
963 mutex_lock(&usb_bus_list_lock);
965 usb_dev->ep0.desc.wMaxPacketSize = cpu_to_le16(64);
966 retval = usb_get_device_descriptor(usb_dev, USB_DT_DEVICE_SIZE);
967 if (retval != sizeof usb_dev->descriptor) {
968 mutex_unlock(&usb_bus_list_lock);
969 dev_dbg (parent_dev, "can't read %s device descriptor %d\n",
970 dev_name(&usb_dev->dev), retval);
971 return (retval < 0) ? retval : -EMSGSIZE;
974 retval = usb_new_device (usb_dev);
976 dev_err (parent_dev, "can't register root hub for %s, %d\n",
977 dev_name(&usb_dev->dev), retval);
979 mutex_unlock(&usb_bus_list_lock);
982 spin_lock_irq (&hcd_root_hub_lock);
983 hcd->rh_registered = 1;
984 spin_unlock_irq (&hcd_root_hub_lock);
986 /* Did the HC die before the root hub was registered? */
987 if (hcd->state == HC_STATE_HALT)
988 usb_hc_died (hcd); /* This time clean up */
995 /*-------------------------------------------------------------------------*/
998 * usb_calc_bus_time - approximate periodic transaction time in nanoseconds
999 * @speed: from dev->speed; USB_SPEED_{LOW,FULL,HIGH}
1000 * @is_input: true iff the transaction sends data to the host
1001 * @isoc: true for isochronous transactions, false for interrupt ones
1002 * @bytecount: how many bytes in the transaction.
1004 * Returns approximate bus time in nanoseconds for a periodic transaction.
1005 * See USB 2.0 spec section 5.11.3; only periodic transfers need to be
1006 * scheduled in software, this function is only used for such scheduling.
1008 long usb_calc_bus_time (int speed, int is_input, int isoc, int bytecount)
1013 case USB_SPEED_LOW: /* INTR only */
1015 tmp = (67667L * (31L + 10L * BitTime (bytecount))) / 1000L;
1016 return (64060L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
1018 tmp = (66700L * (31L + 10L * BitTime (bytecount))) / 1000L;
1019 return (64107L + (2 * BW_HUB_LS_SETUP) + BW_HOST_DELAY + tmp);
1021 case USB_SPEED_FULL: /* ISOC or INTR */
1023 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
1024 return (((is_input) ? 7268L : 6265L) + BW_HOST_DELAY + tmp);
1026 tmp = (8354L * (31L + 10L * BitTime (bytecount))) / 1000L;
1027 return (9107L + BW_HOST_DELAY + tmp);
1029 case USB_SPEED_HIGH: /* ISOC or INTR */
1030 // FIXME adjust for input vs output
1032 tmp = HS_NSECS_ISO (bytecount);
1034 tmp = HS_NSECS (bytecount);
1037 pr_debug ("%s: bogus device speed!\n", usbcore_name);
1041 EXPORT_SYMBOL_GPL(usb_calc_bus_time);
1044 /*-------------------------------------------------------------------------*/
1047 * Generic HC operations.
1050 /*-------------------------------------------------------------------------*/
1053 * usb_hcd_link_urb_to_ep - add an URB to its endpoint queue
1054 * @hcd: host controller to which @urb was submitted
1055 * @urb: URB being submitted
1057 * Host controller drivers should call this routine in their enqueue()
1058 * method. The HCD's private spinlock must be held and interrupts must
1059 * be disabled. The actions carried out here are required for URB
1060 * submission, as well as for endpoint shutdown and for usb_kill_urb.
1062 * Returns 0 for no error, otherwise a negative error code (in which case
1063 * the enqueue() method must fail). If no error occurs but enqueue() fails
1064 * anyway, it must call usb_hcd_unlink_urb_from_ep() before releasing
1065 * the private spinlock and returning.
1067 int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb)
1071 spin_lock(&hcd_urb_list_lock);
1073 /* Check that the URB isn't being killed */
1074 if (unlikely(atomic_read(&urb->reject))) {
1079 if (unlikely(!urb->ep->enabled)) {
1084 if (unlikely(!urb->dev->can_submit)) {
1090 * Check the host controller's state and add the URB to the
1093 switch (hcd->state) {
1094 case HC_STATE_RUNNING:
1095 case HC_STATE_RESUMING:
1097 list_add_tail(&urb->urb_list, &urb->ep->urb_list);
1104 spin_unlock(&hcd_urb_list_lock);
1107 EXPORT_SYMBOL_GPL(usb_hcd_link_urb_to_ep);
1110 * usb_hcd_check_unlink_urb - check whether an URB may be unlinked
1111 * @hcd: host controller to which @urb was submitted
1112 * @urb: URB being checked for unlinkability
1113 * @status: error code to store in @urb if the unlink succeeds
1115 * Host controller drivers should call this routine in their dequeue()
1116 * method. The HCD's private spinlock must be held and interrupts must
1117 * be disabled. The actions carried out here are required for making
1118 * sure than an unlink is valid.
1120 * Returns 0 for no error, otherwise a negative error code (in which case
1121 * the dequeue() method must fail). The possible error codes are:
1123 * -EIDRM: @urb was not submitted or has already completed.
1124 * The completion function may not have been called yet.
1126 * -EBUSY: @urb has already been unlinked.
1128 int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
1131 struct list_head *tmp;
1133 /* insist the urb is still queued */
1134 list_for_each(tmp, &urb->ep->urb_list) {
1135 if (tmp == &urb->urb_list)
1138 if (tmp != &urb->urb_list)
1141 /* Any status except -EINPROGRESS means something already started to
1142 * unlink this URB from the hardware. So there's no more work to do.
1146 urb->unlinked = status;
1148 /* IRQ setup can easily be broken so that USB controllers
1149 * never get completion IRQs ... maybe even the ones we need to
1150 * finish unlinking the initial failed usb_set_address()
1151 * or device descriptor fetch.
1153 if (!HCD_SAW_IRQ(hcd) && !is_root_hub(urb->dev)) {
1154 dev_warn(hcd->self.controller, "Unlink after no-IRQ? "
1155 "Controller is probably using the wrong IRQ.\n");
1156 set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
1161 EXPORT_SYMBOL_GPL(usb_hcd_check_unlink_urb);
1164 * usb_hcd_unlink_urb_from_ep - remove an URB from its endpoint queue
1165 * @hcd: host controller to which @urb was submitted
1166 * @urb: URB being unlinked
1168 * Host controller drivers should call this routine before calling
1169 * usb_hcd_giveback_urb(). The HCD's private spinlock must be held and
1170 * interrupts must be disabled. The actions carried out here are required
1171 * for URB completion.
1173 void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb)
1175 /* clear all state linking urb to this dev (and hcd) */
1176 spin_lock(&hcd_urb_list_lock);
1177 list_del_init(&urb->urb_list);
1178 spin_unlock(&hcd_urb_list_lock);
1180 EXPORT_SYMBOL_GPL(usb_hcd_unlink_urb_from_ep);
1183 * Some usb host controllers can only perform dma using a small SRAM area.
1184 * The usb core itself is however optimized for host controllers that can dma
1185 * using regular system memory - like pci devices doing bus mastering.
1187 * To support host controllers with limited dma capabilites we provide dma
1188 * bounce buffers. This feature can be enabled using the HCD_LOCAL_MEM flag.
1189 * For this to work properly the host controller code must first use the
1190 * function dma_declare_coherent_memory() to point out which memory area
1191 * that should be used for dma allocations.
1193 * The HCD_LOCAL_MEM flag then tells the usb code to allocate all data for
1194 * dma using dma_alloc_coherent() which in turn allocates from the memory
1195 * area pointed out with dma_declare_coherent_memory().
1197 * So, to summarize...
1199 * - We need "local" memory, canonical example being
1200 * a small SRAM on a discrete controller being the
1201 * only memory that the controller can read ...
1202 * (a) "normal" kernel memory is no good, and
1203 * (b) there's not enough to share
1205 * - The only *portable* hook for such stuff in the
1206 * DMA framework is dma_declare_coherent_memory()
1208 * - So we use that, even though the primary requirement
1209 * is that the memory be "local" (hence addressible
1210 * by that device), not "coherent".
1214 static int hcd_alloc_coherent(struct usb_bus *bus,
1215 gfp_t mem_flags, dma_addr_t *dma_handle,
1216 void **vaddr_handle, size_t size,
1217 enum dma_data_direction dir)
1219 unsigned char *vaddr;
1221 if (*vaddr_handle == NULL) {
1226 vaddr = hcd_buffer_alloc(bus, size + sizeof(vaddr),
1227 mem_flags, dma_handle);
1232 * Store the virtual address of the buffer at the end
1233 * of the allocated dma buffer. The size of the buffer
1234 * may be uneven so use unaligned functions instead
1235 * of just rounding up. It makes sense to optimize for
1236 * memory footprint over access speed since the amount
1237 * of memory available for dma may be limited.
1239 put_unaligned((unsigned long)*vaddr_handle,
1240 (unsigned long *)(vaddr + size));
1242 if (dir == DMA_TO_DEVICE)
1243 memcpy(vaddr, *vaddr_handle, size);
1245 *vaddr_handle = vaddr;
1249 static void hcd_free_coherent(struct usb_bus *bus, dma_addr_t *dma_handle,
1250 void **vaddr_handle, size_t size,
1251 enum dma_data_direction dir)
1253 unsigned char *vaddr = *vaddr_handle;
1255 vaddr = (void *)get_unaligned((unsigned long *)(vaddr + size));
1257 if (dir == DMA_FROM_DEVICE)
1258 memcpy(vaddr, *vaddr_handle, size);
1260 hcd_buffer_free(bus, size + sizeof(vaddr), *vaddr_handle, *dma_handle);
1262 *vaddr_handle = vaddr;
1266 void unmap_urb_setup_for_dma(struct usb_hcd *hcd, struct urb *urb)
1268 if (urb->transfer_flags & URB_SETUP_MAP_SINGLE)
1269 dma_unmap_single(hcd->self.controller,
1271 sizeof(struct usb_ctrlrequest),
1273 else if (urb->transfer_flags & URB_SETUP_MAP_LOCAL)
1274 hcd_free_coherent(urb->dev->bus,
1276 (void **) &urb->setup_packet,
1277 sizeof(struct usb_ctrlrequest),
1280 /* Make it safe to call this routine more than once */
1281 urb->transfer_flags &= ~(URB_SETUP_MAP_SINGLE | URB_SETUP_MAP_LOCAL);
1283 EXPORT_SYMBOL_GPL(unmap_urb_setup_for_dma);
1285 void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
1287 enum dma_data_direction dir;
1289 unmap_urb_setup_for_dma(hcd, urb);
1291 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
1292 if (urb->transfer_flags & URB_DMA_MAP_SG)
1293 dma_unmap_sg(hcd->self.controller,
1297 else if (urb->transfer_flags & URB_DMA_MAP_PAGE)
1298 dma_unmap_page(hcd->self.controller,
1300 urb->transfer_buffer_length,
1302 else if (urb->transfer_flags & URB_DMA_MAP_SINGLE)
1303 dma_unmap_single(hcd->self.controller,
1305 urb->transfer_buffer_length,
1307 else if (urb->transfer_flags & URB_MAP_LOCAL)
1308 hcd_free_coherent(urb->dev->bus,
1310 &urb->transfer_buffer,
1311 urb->transfer_buffer_length,
1314 /* Make it safe to call this routine more than once */
1315 urb->transfer_flags &= ~(URB_DMA_MAP_SG | URB_DMA_MAP_PAGE |
1316 URB_DMA_MAP_SINGLE | URB_MAP_LOCAL);
1318 EXPORT_SYMBOL_GPL(unmap_urb_for_dma);
1320 static int map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
1323 enum dma_data_direction dir;
1326 /* Map the URB's buffers for DMA access.
1327 * Lower level HCD code should use *_dma exclusively,
1328 * unless it uses pio or talks to another transport,
1329 * or uses the provided scatter gather list for bulk.
1332 if (usb_endpoint_xfer_control(&urb->ep->desc)) {
1333 if (hcd->self.uses_pio_for_control)
1335 if (hcd->self.uses_dma) {
1336 urb->setup_dma = dma_map_single(
1337 hcd->self.controller,
1339 sizeof(struct usb_ctrlrequest),
1341 if (dma_mapping_error(hcd->self.controller,
1344 urb->transfer_flags |= URB_SETUP_MAP_SINGLE;
1345 } else if (hcd->driver->flags & HCD_LOCAL_MEM) {
1346 ret = hcd_alloc_coherent(
1347 urb->dev->bus, mem_flags,
1349 (void **)&urb->setup_packet,
1350 sizeof(struct usb_ctrlrequest),
1354 urb->transfer_flags |= URB_SETUP_MAP_LOCAL;
1358 dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
1359 if (urb->transfer_buffer_length != 0
1360 && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) {
1361 if (hcd->self.uses_dma) {
1364 hcd->self.controller,
1371 urb->transfer_flags |= URB_DMA_MAP_SG;
1372 if (n != urb->num_sgs) {
1374 urb->transfer_flags |=
1375 URB_DMA_SG_COMBINED;
1377 } else if (urb->sg) {
1378 struct scatterlist *sg = urb->sg;
1379 urb->transfer_dma = dma_map_page(
1380 hcd->self.controller,
1383 urb->transfer_buffer_length,
1385 if (dma_mapping_error(hcd->self.controller,
1389 urb->transfer_flags |= URB_DMA_MAP_PAGE;
1391 urb->transfer_dma = dma_map_single(
1392 hcd->self.controller,
1393 urb->transfer_buffer,
1394 urb->transfer_buffer_length,
1396 if (dma_mapping_error(hcd->self.controller,
1400 urb->transfer_flags |= URB_DMA_MAP_SINGLE;
1402 } else if (hcd->driver->flags & HCD_LOCAL_MEM) {
1403 ret = hcd_alloc_coherent(
1404 urb->dev->bus, mem_flags,
1406 &urb->transfer_buffer,
1407 urb->transfer_buffer_length,
1410 urb->transfer_flags |= URB_MAP_LOCAL;
1412 if (ret && (urb->transfer_flags & (URB_SETUP_MAP_SINGLE |
1413 URB_SETUP_MAP_LOCAL)))
1414 unmap_urb_for_dma(hcd, urb);
1419 /*-------------------------------------------------------------------------*/
1421 /* may be called in any context with a valid urb->dev usecount
1422 * caller surrenders "ownership" of urb
1423 * expects usb_submit_urb() to have sanity checked and conditioned all
1426 int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags)
1429 struct usb_hcd *hcd = bus_to_hcd(urb->dev->bus);
1431 /* increment urb's reference count as part of giving it to the HCD
1432 * (which will control it). HCD guarantees that it either returns
1433 * an error or calls giveback(), but not both.
1436 atomic_inc(&urb->use_count);
1437 atomic_inc(&urb->dev->urbnum);
1438 usbmon_urb_submit(&hcd->self, urb);
1440 /* NOTE requirements on root-hub callers (usbfs and the hub
1441 * driver, for now): URBs' urb->transfer_buffer must be
1442 * valid and usb_buffer_{sync,unmap}() not be needed, since
1443 * they could clobber root hub response data. Also, control
1444 * URBs must be submitted in process context with interrupts
1448 if (is_root_hub(urb->dev)) {
1449 status = rh_urb_enqueue(hcd, urb);
1451 status = map_urb_for_dma(hcd, urb, mem_flags);
1452 if (likely(status == 0)) {
1453 status = hcd->driver->urb_enqueue(hcd, urb, mem_flags);
1454 if (unlikely(status))
1455 unmap_urb_for_dma(hcd, urb);
1459 if (unlikely(status)) {
1460 usbmon_urb_submit_error(&hcd->self, urb, status);
1462 INIT_LIST_HEAD(&urb->urb_list);
1463 atomic_dec(&urb->use_count);
1464 atomic_dec(&urb->dev->urbnum);
1465 if (atomic_read(&urb->reject))
1466 wake_up(&usb_kill_urb_queue);
1472 /*-------------------------------------------------------------------------*/
1474 /* this makes the hcd giveback() the urb more quickly, by kicking it
1475 * off hardware queues (which may take a while) and returning it as
1476 * soon as practical. we've already set up the urb's return status,
1477 * but we can't know if the callback completed already.
1479 static int unlink1(struct usb_hcd *hcd, struct urb *urb, int status)
1483 if (is_root_hub(urb->dev))
1484 value = usb_rh_urb_dequeue(hcd, urb, status);
1487 /* The only reason an HCD might fail this call is if
1488 * it has not yet fully queued the urb to begin with.
1489 * Such failures should be harmless. */
1490 value = hcd->driver->urb_dequeue(hcd, urb, status);
1496 * called in any context
1498 * caller guarantees urb won't be recycled till both unlink()
1499 * and the urb's completion function return
1501 int usb_hcd_unlink_urb (struct urb *urb, int status)
1503 struct usb_hcd *hcd;
1504 int retval = -EIDRM;
1505 unsigned long flags;
1507 /* Prevent the device and bus from going away while
1508 * the unlink is carried out. If they are already gone
1509 * then urb->use_count must be 0, since disconnected
1510 * devices can't have any active URBs.
1512 spin_lock_irqsave(&hcd_urb_unlink_lock, flags);
1513 if (atomic_read(&urb->use_count) > 0) {
1515 usb_get_dev(urb->dev);
1517 spin_unlock_irqrestore(&hcd_urb_unlink_lock, flags);
1519 hcd = bus_to_hcd(urb->dev->bus);
1520 retval = unlink1(hcd, urb, status);
1521 usb_put_dev(urb->dev);
1525 retval = -EINPROGRESS;
1526 else if (retval != -EIDRM && retval != -EBUSY)
1527 dev_dbg(&urb->dev->dev, "hcd_unlink_urb %p fail %d\n",
1532 /*-------------------------------------------------------------------------*/
1535 * usb_hcd_giveback_urb - return URB from HCD to device driver
1536 * @hcd: host controller returning the URB
1537 * @urb: urb being returned to the USB device driver.
1538 * @status: completion status code for the URB.
1539 * Context: in_interrupt()
1541 * This hands the URB from HCD to its USB device driver, using its
1542 * completion function. The HCD has freed all per-urb resources
1543 * (and is done using urb->hcpriv). It also released all HCD locks;
1544 * the device driver won't cause problems if it frees, modifies,
1545 * or resubmits this URB.
1547 * If @urb was unlinked, the value of @status will be overridden by
1548 * @urb->unlinked. Erroneous short transfers are detected in case
1549 * the HCD hasn't checked for them.
1551 void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb, int status)
1554 if (unlikely(urb->unlinked))
1555 status = urb->unlinked;
1556 else if (unlikely((urb->transfer_flags & URB_SHORT_NOT_OK) &&
1557 urb->actual_length < urb->transfer_buffer_length &&
1559 status = -EREMOTEIO;
1561 unmap_urb_for_dma(hcd, urb);
1562 usbmon_urb_complete(&hcd->self, urb, status);
1563 usb_unanchor_urb(urb);
1565 /* pass ownership to the completion handler */
1566 urb->status = status;
1567 urb->complete (urb);
1568 atomic_dec (&urb->use_count);
1569 if (unlikely(atomic_read(&urb->reject)))
1570 wake_up (&usb_kill_urb_queue);
1573 EXPORT_SYMBOL_GPL(usb_hcd_giveback_urb);
1575 /*-------------------------------------------------------------------------*/
1577 /* Cancel all URBs pending on this endpoint and wait for the endpoint's
1578 * queue to drain completely. The caller must first insure that no more
1579 * URBs can be submitted for this endpoint.
1581 void usb_hcd_flush_endpoint(struct usb_device *udev,
1582 struct usb_host_endpoint *ep)
1584 struct usb_hcd *hcd;
1590 hcd = bus_to_hcd(udev->bus);
1592 /* No more submits can occur */
1593 spin_lock_irq(&hcd_urb_list_lock);
1595 list_for_each_entry (urb, &ep->urb_list, urb_list) {
1601 is_in = usb_urb_dir_in(urb);
1602 spin_unlock(&hcd_urb_list_lock);
1605 unlink1(hcd, urb, -ESHUTDOWN);
1606 dev_dbg (hcd->self.controller,
1607 "shutdown urb %p ep%d%s%s\n",
1608 urb, usb_endpoint_num(&ep->desc),
1609 is_in ? "in" : "out",
1612 switch (usb_endpoint_type(&ep->desc)) {
1613 case USB_ENDPOINT_XFER_CONTROL:
1615 case USB_ENDPOINT_XFER_BULK:
1617 case USB_ENDPOINT_XFER_INT:
1626 /* list contents may have changed */
1627 spin_lock(&hcd_urb_list_lock);
1630 spin_unlock_irq(&hcd_urb_list_lock);
1632 /* Wait until the endpoint queue is completely empty */
1633 while (!list_empty (&ep->urb_list)) {
1634 spin_lock_irq(&hcd_urb_list_lock);
1636 /* The list may have changed while we acquired the spinlock */
1638 if (!list_empty (&ep->urb_list)) {
1639 urb = list_entry (ep->urb_list.prev, struct urb,
1643 spin_unlock_irq(&hcd_urb_list_lock);
1653 * usb_hcd_alloc_bandwidth - check whether a new bandwidth setting exceeds
1655 * @udev: target &usb_device
1656 * @new_config: new configuration to install
1657 * @cur_alt: the current alternate interface setting
1658 * @new_alt: alternate interface setting that is being installed
1660 * To change configurations, pass in the new configuration in new_config,
1661 * and pass NULL for cur_alt and new_alt.
1663 * To reset a device's configuration (put the device in the ADDRESSED state),
1664 * pass in NULL for new_config, cur_alt, and new_alt.
1666 * To change alternate interface settings, pass in NULL for new_config,
1667 * pass in the current alternate interface setting in cur_alt,
1668 * and pass in the new alternate interface setting in new_alt.
1670 * Returns an error if the requested bandwidth change exceeds the
1671 * bus bandwidth or host controller internal resources.
1673 int usb_hcd_alloc_bandwidth(struct usb_device *udev,
1674 struct usb_host_config *new_config,
1675 struct usb_host_interface *cur_alt,
1676 struct usb_host_interface *new_alt)
1678 int num_intfs, i, j;
1679 struct usb_host_interface *alt = NULL;
1681 struct usb_hcd *hcd;
1682 struct usb_host_endpoint *ep;
1684 hcd = bus_to_hcd(udev->bus);
1685 if (!hcd->driver->check_bandwidth)
1688 /* Configuration is being removed - set configuration 0 */
1689 if (!new_config && !cur_alt) {
1690 for (i = 1; i < 16; ++i) {
1691 ep = udev->ep_out[i];
1693 hcd->driver->drop_endpoint(hcd, udev, ep);
1694 ep = udev->ep_in[i];
1696 hcd->driver->drop_endpoint(hcd, udev, ep);
1698 hcd->driver->check_bandwidth(hcd, udev);
1701 /* Check if the HCD says there's enough bandwidth. Enable all endpoints
1702 * each interface's alt setting 0 and ask the HCD to check the bandwidth
1703 * of the bus. There will always be bandwidth for endpoint 0, so it's
1707 num_intfs = new_config->desc.bNumInterfaces;
1708 /* Remove endpoints (except endpoint 0, which is always on the
1709 * schedule) from the old config from the schedule
1711 for (i = 1; i < 16; ++i) {
1712 ep = udev->ep_out[i];
1714 ret = hcd->driver->drop_endpoint(hcd, udev, ep);
1718 ep = udev->ep_in[i];
1720 ret = hcd->driver->drop_endpoint(hcd, udev, ep);
1725 for (i = 0; i < num_intfs; ++i) {
1726 struct usb_host_interface *first_alt;
1729 first_alt = &new_config->intf_cache[i]->altsetting[0];
1730 iface_num = first_alt->desc.bInterfaceNumber;
1731 /* Set up endpoints for alternate interface setting 0 */
1732 alt = usb_find_alt_setting(new_config, iface_num, 0);
1734 /* No alt setting 0? Pick the first setting. */
1737 for (j = 0; j < alt->desc.bNumEndpoints; j++) {
1738 ret = hcd->driver->add_endpoint(hcd, udev, &alt->endpoint[j]);
1744 if (cur_alt && new_alt) {
1745 struct usb_interface *iface = usb_ifnum_to_if(udev,
1746 cur_alt->desc.bInterfaceNumber);
1748 if (iface->resetting_device) {
1750 * The USB core just reset the device, so the xHCI host
1751 * and the device will think alt setting 0 is installed.
1752 * However, the USB core will pass in the alternate
1753 * setting installed before the reset as cur_alt. Dig
1754 * out the alternate setting 0 structure, or the first
1755 * alternate setting if a broken device doesn't have alt
1758 cur_alt = usb_altnum_to_altsetting(iface, 0);
1760 cur_alt = &iface->altsetting[0];
1763 /* Drop all the endpoints in the current alt setting */
1764 for (i = 0; i < cur_alt->desc.bNumEndpoints; i++) {
1765 ret = hcd->driver->drop_endpoint(hcd, udev,
1766 &cur_alt->endpoint[i]);
1770 /* Add all the endpoints in the new alt setting */
1771 for (i = 0; i < new_alt->desc.bNumEndpoints; i++) {
1772 ret = hcd->driver->add_endpoint(hcd, udev,
1773 &new_alt->endpoint[i]);
1778 ret = hcd->driver->check_bandwidth(hcd, udev);
1781 hcd->driver->reset_bandwidth(hcd, udev);
1785 /* Disables the endpoint: synchronizes with the hcd to make sure all
1786 * endpoint state is gone from hardware. usb_hcd_flush_endpoint() must
1787 * have been called previously. Use for set_configuration, set_interface,
1788 * driver removal, physical disconnect.
1790 * example: a qh stored in ep->hcpriv, holding state related to endpoint
1791 * type, maxpacket size, toggle, halt status, and scheduling.
1793 void usb_hcd_disable_endpoint(struct usb_device *udev,
1794 struct usb_host_endpoint *ep)
1796 struct usb_hcd *hcd;
1799 hcd = bus_to_hcd(udev->bus);
1800 if (hcd->driver->endpoint_disable)
1801 hcd->driver->endpoint_disable(hcd, ep);
1805 * usb_hcd_reset_endpoint - reset host endpoint state
1806 * @udev: USB device.
1807 * @ep: the endpoint to reset.
1809 * Resets any host endpoint state such as the toggle bit, sequence
1810 * number and current window.
1812 void usb_hcd_reset_endpoint(struct usb_device *udev,
1813 struct usb_host_endpoint *ep)
1815 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
1817 if (hcd->driver->endpoint_reset)
1818 hcd->driver->endpoint_reset(hcd, ep);
1820 int epnum = usb_endpoint_num(&ep->desc);
1821 int is_out = usb_endpoint_dir_out(&ep->desc);
1822 int is_control = usb_endpoint_xfer_control(&ep->desc);
1824 usb_settoggle(udev, epnum, is_out, 0);
1826 usb_settoggle(udev, epnum, !is_out, 0);
1831 * usb_alloc_streams - allocate bulk endpoint stream IDs.
1832 * @interface: alternate setting that includes all endpoints.
1833 * @eps: array of endpoints that need streams.
1834 * @num_eps: number of endpoints in the array.
1835 * @num_streams: number of streams to allocate.
1836 * @mem_flags: flags hcd should use to allocate memory.
1838 * Sets up a group of bulk endpoints to have num_streams stream IDs available.
1839 * Drivers may queue multiple transfers to different stream IDs, which may
1840 * complete in a different order than they were queued.
1842 int usb_alloc_streams(struct usb_interface *interface,
1843 struct usb_host_endpoint **eps, unsigned int num_eps,
1844 unsigned int num_streams, gfp_t mem_flags)
1846 struct usb_hcd *hcd;
1847 struct usb_device *dev;
1850 dev = interface_to_usbdev(interface);
1851 hcd = bus_to_hcd(dev->bus);
1852 if (!hcd->driver->alloc_streams || !hcd->driver->free_streams)
1854 if (dev->speed != USB_SPEED_SUPER)
1857 /* Streams only apply to bulk endpoints. */
1858 for (i = 0; i < num_eps; i++)
1859 if (!usb_endpoint_xfer_bulk(&eps[i]->desc))
1862 return hcd->driver->alloc_streams(hcd, dev, eps, num_eps,
1863 num_streams, mem_flags);
1865 EXPORT_SYMBOL_GPL(usb_alloc_streams);
1868 * usb_free_streams - free bulk endpoint stream IDs.
1869 * @interface: alternate setting that includes all endpoints.
1870 * @eps: array of endpoints to remove streams from.
1871 * @num_eps: number of endpoints in the array.
1872 * @mem_flags: flags hcd should use to allocate memory.
1874 * Reverts a group of bulk endpoints back to not using stream IDs.
1875 * Can fail if we are given bad arguments, or HCD is broken.
1877 void usb_free_streams(struct usb_interface *interface,
1878 struct usb_host_endpoint **eps, unsigned int num_eps,
1881 struct usb_hcd *hcd;
1882 struct usb_device *dev;
1885 dev = interface_to_usbdev(interface);
1886 hcd = bus_to_hcd(dev->bus);
1887 if (dev->speed != USB_SPEED_SUPER)
1890 /* Streams only apply to bulk endpoints. */
1891 for (i = 0; i < num_eps; i++)
1892 if (!usb_endpoint_xfer_bulk(&eps[i]->desc))
1895 hcd->driver->free_streams(hcd, dev, eps, num_eps, mem_flags);
1897 EXPORT_SYMBOL_GPL(usb_free_streams);
1899 /* Protect against drivers that try to unlink URBs after the device
1900 * is gone, by waiting until all unlinks for @udev are finished.
1901 * Since we don't currently track URBs by device, simply wait until
1902 * nothing is running in the locked region of usb_hcd_unlink_urb().
1904 void usb_hcd_synchronize_unlinks(struct usb_device *udev)
1906 spin_lock_irq(&hcd_urb_unlink_lock);
1907 spin_unlock_irq(&hcd_urb_unlink_lock);
1910 /*-------------------------------------------------------------------------*/
1912 /* called in any context */
1913 int usb_hcd_get_frame_number (struct usb_device *udev)
1915 struct usb_hcd *hcd = bus_to_hcd(udev->bus);
1917 if (!HC_IS_RUNNING (hcd->state))
1919 return hcd->driver->get_frame_number (hcd);
1922 /*-------------------------------------------------------------------------*/
1926 int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg)
1928 struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self);
1930 int old_state = hcd->state;
1932 dev_dbg(&rhdev->dev, "bus %s%s\n",
1933 (msg.event & PM_EVENT_AUTO ? "auto-" : ""), "suspend");
1934 if (!hcd->driver->bus_suspend) {
1937 hcd->state = HC_STATE_QUIESCING;
1938 status = hcd->driver->bus_suspend(hcd);
1941 usb_set_device_state(rhdev, USB_STATE_SUSPENDED);
1942 hcd->state = HC_STATE_SUSPENDED;
1944 hcd->state = old_state;
1945 dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
1951 int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg)
1953 struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self);
1955 int old_state = hcd->state;
1957 dev_dbg(&rhdev->dev, "usb %s%s\n",
1958 (msg.event & PM_EVENT_AUTO ? "auto-" : ""), "resume");
1959 clear_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
1960 if (!hcd->driver->bus_resume)
1962 if (hcd->state == HC_STATE_RUNNING)
1965 hcd->state = HC_STATE_RESUMING;
1966 status = hcd->driver->bus_resume(hcd);
1968 /* TRSMRCY = 10 msec */
1970 usb_set_device_state(rhdev, rhdev->actconfig
1971 ? USB_STATE_CONFIGURED
1972 : USB_STATE_ADDRESS);
1973 hcd->state = HC_STATE_RUNNING;
1975 hcd->state = old_state;
1976 dev_dbg(&rhdev->dev, "bus %s fail, err %d\n",
1978 if (status != -ESHUTDOWN)
1984 #endif /* CONFIG_PM */
1986 #ifdef CONFIG_USB_SUSPEND
1988 /* Workqueue routine for root-hub remote wakeup */
1989 static void hcd_resume_work(struct work_struct *work)
1991 struct usb_hcd *hcd = container_of(work, struct usb_hcd, wakeup_work);
1992 struct usb_device *udev = hcd->self.root_hub;
1994 usb_lock_device(udev);
1995 usb_remote_wakeup(udev);
1996 usb_unlock_device(udev);
2000 * usb_hcd_resume_root_hub - called by HCD to resume its root hub
2001 * @hcd: host controller for this root hub
2003 * The USB host controller calls this function when its root hub is
2004 * suspended (with the remote wakeup feature enabled) and a remote
2005 * wakeup request is received. The routine submits a workqueue request
2006 * to resume the root hub (that is, manage its downstream ports again).
2008 void usb_hcd_resume_root_hub (struct usb_hcd *hcd)
2010 unsigned long flags;
2012 spin_lock_irqsave (&hcd_root_hub_lock, flags);
2013 if (hcd->rh_registered) {
2014 set_bit(HCD_FLAG_WAKEUP_PENDING, &hcd->flags);
2015 queue_work(pm_wq, &hcd->wakeup_work);
2017 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
2019 EXPORT_SYMBOL_GPL(usb_hcd_resume_root_hub);
2021 #endif /* CONFIG_USB_SUSPEND */
2023 /*-------------------------------------------------------------------------*/
2025 #ifdef CONFIG_USB_OTG
2028 * usb_bus_start_enum - start immediate enumeration (for OTG)
2029 * @bus: the bus (must use hcd framework)
2030 * @port_num: 1-based number of port; usually bus->otg_port
2031 * Context: in_interrupt()
2033 * Starts enumeration, with an immediate reset followed later by
2034 * khubd identifying and possibly configuring the device.
2035 * This is needed by OTG controller drivers, where it helps meet
2036 * HNP protocol timing requirements for starting a port reset.
2038 int usb_bus_start_enum(struct usb_bus *bus, unsigned port_num)
2040 struct usb_hcd *hcd;
2041 int status = -EOPNOTSUPP;
2043 /* NOTE: since HNP can't start by grabbing the bus's address0_sem,
2044 * boards with root hubs hooked up to internal devices (instead of
2045 * just the OTG port) may need more attention to resetting...
2047 hcd = container_of (bus, struct usb_hcd, self);
2048 if (port_num && hcd->driver->start_port_reset)
2049 status = hcd->driver->start_port_reset(hcd, port_num);
2051 /* run khubd shortly after (first) root port reset finishes;
2052 * it may issue others, until at least 50 msecs have passed.
2055 mod_timer(&hcd->rh_timer, jiffies + msecs_to_jiffies(10));
2058 EXPORT_SYMBOL_GPL(usb_bus_start_enum);
2062 /*-------------------------------------------------------------------------*/
2065 * usb_hcd_irq - hook IRQs to HCD framework (bus glue)
2066 * @irq: the IRQ being raised
2067 * @__hcd: pointer to the HCD whose IRQ is being signaled
2069 * If the controller isn't HALTed, calls the driver's irq handler.
2070 * Checks whether the controller is now dead.
2072 irqreturn_t usb_hcd_irq (int irq, void *__hcd)
2074 struct usb_hcd *hcd = __hcd;
2075 unsigned long flags;
2078 /* IRQF_DISABLED doesn't work correctly with shared IRQs
2079 * when the first handler doesn't use it. So let's just
2080 * assume it's never used.
2082 local_irq_save(flags);
2084 if (unlikely(hcd->state == HC_STATE_HALT || !HCD_HW_ACCESSIBLE(hcd))) {
2086 } else if (hcd->driver->irq(hcd) == IRQ_NONE) {
2089 set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
2091 if (unlikely(hcd->state == HC_STATE_HALT))
2096 local_irq_restore(flags);
2099 EXPORT_SYMBOL_GPL(usb_hcd_irq);
2101 /*-------------------------------------------------------------------------*/
2104 * usb_hc_died - report abnormal shutdown of a host controller (bus glue)
2105 * @hcd: pointer to the HCD representing the controller
2107 * This is called by bus glue to report a USB host controller that died
2108 * while operations may still have been pending. It's called automatically
2109 * by the PCI glue, so only glue for non-PCI busses should need to call it.
2111 void usb_hc_died (struct usb_hcd *hcd)
2113 unsigned long flags;
2115 dev_err (hcd->self.controller, "HC died; cleaning up\n");
2117 spin_lock_irqsave (&hcd_root_hub_lock, flags);
2118 if (hcd->rh_registered) {
2119 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2121 /* make khubd clean up old urbs and devices */
2122 usb_set_device_state (hcd->self.root_hub,
2123 USB_STATE_NOTATTACHED);
2124 usb_kick_khubd (hcd->self.root_hub);
2126 spin_unlock_irqrestore (&hcd_root_hub_lock, flags);
2128 EXPORT_SYMBOL_GPL (usb_hc_died);
2130 /*-------------------------------------------------------------------------*/
2133 * usb_create_hcd - create and initialize an HCD structure
2134 * @driver: HC driver that will use this hcd
2135 * @dev: device for this HC, stored in hcd->self.controller
2136 * @bus_name: value to store in hcd->self.bus_name
2137 * Context: !in_interrupt()
2139 * Allocate a struct usb_hcd, with extra space at the end for the
2140 * HC driver's private data. Initialize the generic members of the
2143 * If memory is unavailable, returns NULL.
2145 struct usb_hcd *usb_create_hcd (const struct hc_driver *driver,
2146 struct device *dev, const char *bus_name)
2148 struct usb_hcd *hcd;
2150 hcd = kzalloc(sizeof(*hcd) + driver->hcd_priv_size, GFP_KERNEL);
2152 dev_dbg (dev, "hcd alloc failed\n");
2155 dev_set_drvdata(dev, hcd);
2156 kref_init(&hcd->kref);
2158 usb_bus_init(&hcd->self);
2159 hcd->self.controller = dev;
2160 hcd->self.bus_name = bus_name;
2161 hcd->self.uses_dma = (dev->dma_mask != NULL);
2163 init_timer(&hcd->rh_timer);
2164 hcd->rh_timer.function = rh_timer_func;
2165 hcd->rh_timer.data = (unsigned long) hcd;
2166 #ifdef CONFIG_USB_SUSPEND
2167 INIT_WORK(&hcd->wakeup_work, hcd_resume_work);
2169 mutex_init(&hcd->bandwidth_mutex);
2171 hcd->driver = driver;
2172 hcd->product_desc = (driver->product_desc) ? driver->product_desc :
2173 "USB Host Controller";
2176 EXPORT_SYMBOL_GPL(usb_create_hcd);
2178 static void hcd_release (struct kref *kref)
2180 struct usb_hcd *hcd = container_of (kref, struct usb_hcd, kref);
2185 struct usb_hcd *usb_get_hcd (struct usb_hcd *hcd)
2188 kref_get (&hcd->kref);
2191 EXPORT_SYMBOL_GPL(usb_get_hcd);
2193 void usb_put_hcd (struct usb_hcd *hcd)
2196 kref_put (&hcd->kref, hcd_release);
2198 EXPORT_SYMBOL_GPL(usb_put_hcd);
2201 * usb_add_hcd - finish generic HCD structure initialization and register
2202 * @hcd: the usb_hcd structure to initialize
2203 * @irqnum: Interrupt line to allocate
2204 * @irqflags: Interrupt type flags
2206 * Finish the remaining parts of generic HCD initialization: allocate the
2207 * buffers of consistent memory, register the bus, request the IRQ line,
2208 * and call the driver's reset() and start() routines.
2210 int usb_add_hcd(struct usb_hcd *hcd,
2211 unsigned int irqnum, unsigned long irqflags)
2214 struct usb_device *rhdev;
2216 dev_info(hcd->self.controller, "%s\n", hcd->product_desc);
2218 hcd->authorized_default = hcd->wireless? 0 : 1;
2219 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2221 /* HC is in reset state, but accessible. Now do the one-time init,
2222 * bottom up so that hcds can customize the root hubs before khubd
2223 * starts talking to them. (Note, bus id is assigned early too.)
2225 if ((retval = hcd_buffer_create(hcd)) != 0) {
2226 dev_dbg(hcd->self.controller, "pool alloc failed\n");
2230 if ((retval = usb_register_bus(&hcd->self)) < 0)
2231 goto err_register_bus;
2233 if ((rhdev = usb_alloc_dev(NULL, &hcd->self, 0)) == NULL) {
2234 dev_err(hcd->self.controller, "unable to allocate root hub\n");
2236 goto err_allocate_root_hub;
2238 hcd->self.root_hub = rhdev;
2240 switch (hcd->driver->flags & HCD_MASK) {
2242 rhdev->speed = USB_SPEED_FULL;
2245 rhdev->speed = USB_SPEED_HIGH;
2248 rhdev->speed = USB_SPEED_SUPER;
2251 goto err_set_rh_speed;
2254 /* wakeup flag init defaults to "everything works" for root hubs,
2255 * but drivers can override it in reset() if needed, along with
2256 * recording the overall controller's system wakeup capability.
2258 device_init_wakeup(&rhdev->dev, 1);
2260 /* "reset" is misnamed; its role is now one-time init. the controller
2261 * should already have been reset (and boot firmware kicked off etc).
2263 if (hcd->driver->reset && (retval = hcd->driver->reset(hcd)) < 0) {
2264 dev_err(hcd->self.controller, "can't setup\n");
2265 goto err_hcd_driver_setup;
2267 hcd->rh_pollable = 1;
2269 /* NOTE: root hub and controller capabilities may not be the same */
2270 if (device_can_wakeup(hcd->self.controller)
2271 && device_can_wakeup(&hcd->self.root_hub->dev))
2272 dev_dbg(hcd->self.controller, "supports USB remote wakeup\n");
2274 /* enable irqs just before we start the controller */
2275 if (hcd->driver->irq) {
2277 /* IRQF_DISABLED doesn't work as advertised when used together
2278 * with IRQF_SHARED. As usb_hcd_irq() will always disable
2279 * interrupts we can remove it here.
2281 if (irqflags & IRQF_SHARED)
2282 irqflags &= ~IRQF_DISABLED;
2284 snprintf(hcd->irq_descr, sizeof(hcd->irq_descr), "%s:usb%d",
2285 hcd->driver->description, hcd->self.busnum);
2286 if ((retval = request_irq(irqnum, &usb_hcd_irq, irqflags,
2287 hcd->irq_descr, hcd)) != 0) {
2288 dev_err(hcd->self.controller,
2289 "request interrupt %d failed\n", irqnum);
2290 goto err_request_irq;
2293 dev_info(hcd->self.controller, "irq %d, %s 0x%08llx\n", irqnum,
2294 (hcd->driver->flags & HCD_MEMORY) ?
2295 "io mem" : "io base",
2296 (unsigned long long)hcd->rsrc_start);
2299 if (hcd->rsrc_start)
2300 dev_info(hcd->self.controller, "%s 0x%08llx\n",
2301 (hcd->driver->flags & HCD_MEMORY) ?
2302 "io mem" : "io base",
2303 (unsigned long long)hcd->rsrc_start);
2306 if ((retval = hcd->driver->start(hcd)) < 0) {
2307 dev_err(hcd->self.controller, "startup error %d\n", retval);
2308 goto err_hcd_driver_start;
2311 /* starting here, usbcore will pay attention to this root hub */
2312 rhdev->bus_mA = min(500u, hcd->power_budget);
2313 if ((retval = register_root_hub(hcd)) != 0)
2314 goto err_register_root_hub;
2316 retval = sysfs_create_group(&rhdev->dev.kobj, &usb_bus_attr_group);
2318 printk(KERN_ERR "Cannot register USB bus sysfs attributes: %d\n",
2320 goto error_create_attr_group;
2322 if (hcd->uses_new_polling && HCD_POLL_RH(hcd))
2323 usb_hcd_poll_rh_status(hcd);
2326 error_create_attr_group:
2327 if (HC_IS_RUNNING(hcd->state))
2328 hcd->state = HC_STATE_QUIESCING;
2329 spin_lock_irq(&hcd_root_hub_lock);
2330 hcd->rh_registered = 0;
2331 spin_unlock_irq(&hcd_root_hub_lock);
2333 #ifdef CONFIG_USB_SUSPEND
2334 cancel_work_sync(&hcd->wakeup_work);
2336 mutex_lock(&usb_bus_list_lock);
2337 usb_disconnect(&rhdev); /* Sets rhdev to NULL */
2338 mutex_unlock(&usb_bus_list_lock);
2339 err_register_root_hub:
2340 hcd->rh_pollable = 0;
2341 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2342 del_timer_sync(&hcd->rh_timer);
2343 hcd->driver->stop(hcd);
2344 hcd->state = HC_STATE_HALT;
2345 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2346 del_timer_sync(&hcd->rh_timer);
2347 err_hcd_driver_start:
2349 free_irq(irqnum, hcd);
2351 err_hcd_driver_setup:
2353 usb_put_dev(hcd->self.root_hub);
2354 err_allocate_root_hub:
2355 usb_deregister_bus(&hcd->self);
2357 hcd_buffer_destroy(hcd);
2360 EXPORT_SYMBOL_GPL(usb_add_hcd);
2363 * usb_remove_hcd - shutdown processing for generic HCDs
2364 * @hcd: the usb_hcd structure to remove
2365 * Context: !in_interrupt()
2367 * Disconnects the root hub, then reverses the effects of usb_add_hcd(),
2368 * invoking the HCD's stop() method.
2370 void usb_remove_hcd(struct usb_hcd *hcd)
2372 struct usb_device *rhdev = hcd->self.root_hub;
2374 dev_info(hcd->self.controller, "remove, state %x\n", hcd->state);
2377 sysfs_remove_group(&rhdev->dev.kobj, &usb_bus_attr_group);
2379 if (HC_IS_RUNNING (hcd->state))
2380 hcd->state = HC_STATE_QUIESCING;
2382 dev_dbg(hcd->self.controller, "roothub graceful disconnect\n");
2383 spin_lock_irq (&hcd_root_hub_lock);
2384 hcd->rh_registered = 0;
2385 spin_unlock_irq (&hcd_root_hub_lock);
2387 #ifdef CONFIG_USB_SUSPEND
2388 cancel_work_sync(&hcd->wakeup_work);
2391 mutex_lock(&usb_bus_list_lock);
2392 usb_disconnect(&rhdev); /* Sets rhdev to NULL */
2393 mutex_unlock(&usb_bus_list_lock);
2395 /* Prevent any more root-hub status calls from the timer.
2396 * The HCD might still restart the timer (if a port status change
2397 * interrupt occurs), but usb_hcd_poll_rh_status() won't invoke
2398 * the hub_status_data() callback.
2400 hcd->rh_pollable = 0;
2401 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2402 del_timer_sync(&hcd->rh_timer);
2404 hcd->driver->stop(hcd);
2405 hcd->state = HC_STATE_HALT;
2407 /* In case the HCD restarted the timer, stop it again. */
2408 clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
2409 del_timer_sync(&hcd->rh_timer);
2412 free_irq(hcd->irq, hcd);
2414 usb_put_dev(hcd->self.root_hub);
2415 usb_deregister_bus(&hcd->self);
2416 hcd_buffer_destroy(hcd);
2418 EXPORT_SYMBOL_GPL(usb_remove_hcd);
2421 usb_hcd_platform_shutdown(struct platform_device* dev)
2423 struct usb_hcd *hcd = platform_get_drvdata(dev);
2425 if (hcd->driver->shutdown)
2426 hcd->driver->shutdown(hcd);
2428 EXPORT_SYMBOL_GPL(usb_hcd_platform_shutdown);
2430 /*-------------------------------------------------------------------------*/
2432 #if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
2434 struct usb_mon_operations *mon_ops;
2437 * The registration is unlocked.
2438 * We do it this way because we do not want to lock in hot paths.
2440 * Notice that the code is minimally error-proof. Because usbmon needs
2441 * symbols from usbcore, usbcore gets referenced and cannot be unloaded first.
2444 int usb_mon_register (struct usb_mon_operations *ops)
2454 EXPORT_SYMBOL_GPL (usb_mon_register);
2456 void usb_mon_deregister (void)
2459 if (mon_ops == NULL) {
2460 printk(KERN_ERR "USB: monitor was not registered\n");
2466 EXPORT_SYMBOL_GPL (usb_mon_deregister);
2468 #endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */