diff options
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/Kconfig | 25 | ||||
| -rw-r--r-- | drivers/usb/core/config.c | 42 | ||||
| -rw-r--r-- | drivers/usb/core/devices.c | 26 | ||||
| -rw-r--r-- | drivers/usb/core/driver.c | 162 | ||||
| -rw-r--r-- | drivers/usb/core/file.c | 29 | ||||
| -rw-r--r-- | drivers/usb/core/generic.c | 29 | ||||
| -rw-r--r-- | drivers/usb/core/hcd-pci.c | 3 | ||||
| -rw-r--r-- | drivers/usb/core/hcd.c | 126 | ||||
| -rw-r--r-- | drivers/usb/core/hcd.h | 14 | ||||
| -rw-r--r-- | drivers/usb/core/hub.c | 651 | ||||
| -rw-r--r-- | drivers/usb/core/message.c | 38 | ||||
| -rw-r--r-- | drivers/usb/core/quirks.c | 18 | ||||
| -rw-r--r-- | drivers/usb/core/sysfs.c | 109 | ||||
| -rw-r--r-- | drivers/usb/core/urb.c | 105 | ||||
| -rw-r--r-- | drivers/usb/core/usb.c | 12 | ||||
| -rw-r--r-- | drivers/usb/core/usb.h | 14 |
16 files changed, 867 insertions, 536 deletions
diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig index 346fc030c929..97b09f282705 100644 --- a/drivers/usb/core/Kconfig +++ b/drivers/usb/core/Kconfig @@ -86,6 +86,31 @@ config USB_SUSPEND If you are unsure about this, say N here. +config USB_PERSIST + bool "USB device persistence during system suspend (DANGEROUS)" + depends on USB && PM && EXPERIMENTAL + default n + help + + If you say Y here and enable the "power/persist" attribute + for a USB device, the device's data structures will remain + persistent across system suspend, even if the USB bus loses + power. (This includes hibernation, also known as swsusp or + suspend-to-disk.) The devices will reappear as if by magic + when the system wakes up, with no need to unmount USB + filesystems, rmmod host-controller drivers, or do anything + else. + + WARNING: This option can be dangerous! + + If a USB device is replaced by another of the same type while + the system is asleep, there's a good chance the kernel won't + detect the change. Likewise if the media in a USB storage + device is replaced. When this happens it's almost certain to + cause data corruption and maybe even crash your system. + + If you are unsure, say N here. + config USB_OTG bool depends on USB && EXPERIMENTAL diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c index dd3482328ad2..cb69aa1e02e8 100644 --- a/drivers/usb/core/config.c +++ b/drivers/usb/core/config.c @@ -85,15 +85,21 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum, memcpy(&endpoint->desc, d, n); INIT_LIST_HEAD(&endpoint->urb_list); - /* If the bInterval value is outside the legal range, - * set it to a default value: 32 ms */ + /* Fix up bInterval values outside the legal range. Use 32 ms if no + * proper value can be guessed. */ i = 0; /* i = min, j = max, n = default */ j = 255; if (usb_endpoint_xfer_int(d)) { i = 1; switch (to_usb_device(ddev)->speed) { case USB_SPEED_HIGH: - n = 9; /* 32 ms = 2^(9-1) uframes */ + /* Many device manufacturers are using full-speed + * bInterval values in high-speed interrupt endpoint + * descriptors. Try to fix those and fall back to a + * 32 ms default value otherwise. */ + n = fls(d->bInterval*8); + if (n == 0) + n = 9; /* 32 ms = 2^(9-1) uframes */ j = 16; break; default: /* USB_SPEED_FULL or _LOW */ @@ -124,6 +130,21 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum, endpoint->desc.bInterval = n; } + /* Some buggy low-speed devices have Bulk endpoints, which is + * explicitly forbidden by the USB spec. In an attempt to make + * them usable, we will try treating them as Interrupt endpoints. + */ + if (to_usb_device(ddev)->speed == USB_SPEED_LOW && + usb_endpoint_xfer_bulk(d)) { + dev_warn(ddev, "config %d interface %d altsetting %d " + "endpoint 0x%X is Bulk; changing to Interrupt\n", + cfgno, inum, asnum, d->bEndpointAddress); + endpoint->desc.bmAttributes = USB_ENDPOINT_XFER_INT; + endpoint->desc.bInterval = 1; + if (le16_to_cpu(endpoint->desc.wMaxPacketSize) > 8) + endpoint->desc.wMaxPacketSize = cpu_to_le16(8); + } + /* Skip over any Class Specific or Vendor Specific descriptors; * find the next endpoint or interface descriptor */ endpoint->extra = buffer; @@ -274,6 +295,7 @@ static int usb_parse_configuration(struct device *ddev, int cfgidx, struct usb_descriptor_header *header; int len, retval; u8 inums[USB_MAXINTERFACES], nalts[USB_MAXINTERFACES]; + unsigned iad_num = 0; memcpy(&config->desc, buffer, USB_DT_CONFIG_SIZE); if (config->desc.bDescriptorType != USB_DT_CONFIG || @@ -351,6 +373,20 @@ static int usb_parse_configuration(struct device *ddev, int cfgidx, ++n; } + } else if (header->bDescriptorType == + USB_DT_INTERFACE_ASSOCIATION) { + if (iad_num == USB_MAXIADS) { + dev_warn(ddev, "found more Interface " + "Association Descriptors " + "than allocated for in " + "configuration %d\n", cfgno); + } else { + config->intf_assoc[iad_num] = + (struct usb_interface_assoc_descriptor + *)header; + iad_num++; + } + } else if (header->bDescriptorType == USB_DT_DEVICE || header->bDescriptorType == USB_DT_CONFIG) dev_warn(ddev, "config %d contains an unexpected " diff --git a/drivers/usb/core/devices.c b/drivers/usb/core/devices.c index 6753ca059ee4..87c794d60aa0 100644 --- a/drivers/usb/core/devices.c +++ b/drivers/usb/core/devices.c @@ -102,6 +102,10 @@ static const char *format_config = /* C: #Ifs=dd Cfg#=dd Atr=xx MPwr=dddmA */ "C:%c #Ifs=%2d Cfg#=%2d Atr=%02x MxPwr=%3dmA\n"; +static const char *format_iad = +/* A: FirstIf#=dd IfCount=dd Cls=xx(sssss) Sub=xx Prot=xx */ + "A: FirstIf#=%2d IfCount=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x\n"; + static const char *format_iface = /* I: If#=dd Alt=dd #EPs=dd Cls=xx(sssss) Sub=xx Prot=xx Driver=xxxx*/ "I:%c If#=%2d Alt=%2d #EPs=%2d Cls=%02x(%-5s) Sub=%02x Prot=%02x Driver=%s\n"; @@ -146,6 +150,7 @@ static const struct class_info clas_info[] = {USB_CLASS_STILL_IMAGE, "still"}, {USB_CLASS_CSCID, "scard"}, {USB_CLASS_CONTENT_SEC, "c-sec"}, + {USB_CLASS_VIDEO, "video"}, {-1, "unk."} /* leave as last */ }; @@ -286,6 +291,21 @@ static char *usb_dump_interface( return start; } +static char *usb_dump_iad_descriptor(char *start, char *end, + const struct usb_interface_assoc_descriptor *iad) +{ + if (start > end) + return start; + start += sprintf(start, format_iad, + iad->bFirstInterface, + iad->bInterfaceCount, + iad->bFunctionClass, + class_decode(iad->bFunctionClass), + iad->bFunctionSubClass, + iad->bFunctionProtocol); + return start; +} + /* TBD: * 0. TBDs * 1. marking active interface altsettings (code lists all, but should mark @@ -322,6 +342,12 @@ static char *usb_dump_config ( if (!config) /* getting these some in 2.3.7; none in 2.3.6 */ return start + sprintf(start, "(null Cfg. desc.)\n"); start = usb_dump_config_descriptor(start, end, &config->desc, active); + for (i = 0; i < USB_MAXIADS; i++) { + if (config->intf_assoc[i] == NULL) + break; + start = usb_dump_iad_descriptor(start, end, + config->intf_assoc[i]); + } for (i = 0; i < config->desc.bNumInterfaces; i++) { intfc = config->intf_cache[i]; interface = config->interface[i]; diff --git a/drivers/usb/core/driver.c b/drivers/usb/core/driver.c index 2619986e5300..73c49362cd47 100644 --- a/drivers/usb/core/driver.c +++ b/drivers/usb/core/driver.c @@ -24,10 +24,19 @@ #include <linux/device.h> #include <linux/usb.h> +#include <linux/usb/quirks.h> #include <linux/workqueue.h> #include "hcd.h" #include "usb.h" +#define VERBOSE_DEBUG 0 + +#if VERBOSE_DEBUG +#define dev_vdbg dev_dbg +#else +#define dev_vdbg(dev, fmt, args...) do { } while (0) +#endif + #ifdef CONFIG_HOTPLUG /* @@ -802,18 +811,17 @@ static int usb_suspend_device(struct usb_device *udev, pm_message_t msg) udev->state == USB_STATE_SUSPENDED) goto done; - /* For devices that don't have a driver, we do a standard suspend. */ - if (udev->dev.driver == NULL) { + /* For devices that don't have a driver, we do a generic suspend. */ + if (udev->dev.driver) + udriver = to_usb_device_driver(udev->dev.driver); + else { udev->do_remote_wakeup = 0; - status = usb_port_suspend(udev); - goto done; + udriver = &usb_generic_driver; } - - udriver = to_usb_device_driver(udev->dev.driver); status = udriver->suspend(udev, msg); -done: - // dev_dbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status); + done: + dev_vdbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status); if (status == 0) udev->dev.power.power_state.event = msg.event; return status; @@ -825,8 +833,9 @@ static int usb_resume_device(struct usb_device *udev) struct usb_device_driver *udriver; int status = 0; - if (udev->state == USB_STATE_NOTATTACHED || - udev->state != USB_STATE_SUSPENDED) + if (udev->state == USB_STATE_NOTATTACHED) + goto done; + if (udev->state != USB_STATE_SUSPENDED && !udev->reset_resume) goto done; /* Can't resume it if it doesn't have a driver. */ @@ -835,11 +844,14 @@ static int usb_resume_device(struct usb_device *udev) goto done; } + if (udev->quirks & USB_QUIRK_RESET_RESUME) + udev->reset_resume = 1; + udriver = to_usb_device_driver(udev->dev.driver); status = udriver->resume(udev); -done: - // dev_dbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status); + done: + dev_vdbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status); if (status == 0) { udev->autoresume_disabled = 0; udev->dev.power.power_state.event = PM_EVENT_ON; @@ -877,15 +889,13 @@ static int usb_suspend_interface(struct usb_interface *intf, pm_message_t msg) mark_quiesced(intf); } -done: - // dev_dbg(&intf->dev, "%s: status %d\n", __FUNCTION__, status); - if (status == 0) - intf->dev.power.power_state.event = msg.event; + done: + dev_vdbg(&intf->dev, "%s: status %d\n", __FUNCTION__, status); return status; } /* Caller has locked intf's usb_device's pm_mutex */ -static int usb_resume_interface(struct usb_interface *intf) +static int usb_resume_interface(struct usb_interface *intf, int reset_resume) { struct usb_driver *driver; int status = 0; @@ -905,23 +915,37 @@ static int usb_resume_interface(struct usb_interface *intf) } driver = to_usb_driver(intf->dev.driver); - if (driver->resume) { - status = driver->resume(intf); - if (status) - dev_err(&intf->dev, "%s error %d\n", - "resume", status); - else - mark_active(intf); + if (reset_resume) { + if (driver->reset_resume) { + status = driver->reset_resume(intf); + if (status) + dev_err(&intf->dev, "%s error %d\n", + "reset_resume", status); + } else { + // status = -EOPNOTSUPP; + dev_warn(&intf->dev, "no %s for driver %s?\n", + "reset_resume", driver->name); + } } else { - dev_warn(&intf->dev, "no resume for driver %s?\n", - driver->name); - mark_active(intf); + if (driver->resume) { + status = driver->resume(intf); + if (status) + dev_err(&intf->dev, "%s error %d\n", + "resume", status); + } else { + // status = -EOPNOTSUPP; + dev_warn(&intf->dev, "no %s for driver %s?\n", + "resume", driver->name); + } } done: - // dev_dbg(&intf->dev, "%s: status %d\n", __FUNCTION__, status); + dev_vdbg(&intf->dev, "%s: status %d\n", __FUNCTION__, status); if (status == 0) - intf->dev.power.power_state.event = PM_EVENT_ON; + mark_active(intf); + + /* FIXME: Unbind the driver and reprobe if the resume failed + * (not possible if auto_pm is set) */ return status; } @@ -958,6 +982,18 @@ static int autosuspend_check(struct usb_device *udev) "for autosuspend\n"); return -EOPNOTSUPP; } + + /* Don't allow autosuspend if the device will need + * a reset-resume and any of its interface drivers + * doesn't include support. + */ + if (udev->quirks & USB_QUIRK_RESET_RESUME) { + struct usb_driver *driver; + + driver = to_usb_driver(intf->dev.driver); + if (!driver->reset_resume) + return -EOPNOTSUPP; + } } } @@ -974,7 +1010,7 @@ static int autosuspend_check(struct usb_device *udev) * or for the past. */ queue_delayed_work(ksuspend_usb_wq, &udev->autosuspend, - suspend_time - jiffies); + round_jiffies_relative(suspend_time - jiffies)); } return -EAGAIN; } @@ -1054,14 +1090,21 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg) break; } } - if (status == 0) + if (status == 0) { + + /* Non-root devices don't need to do anything for FREEZE + * or PRETHAW. */ + if (udev->parent && (msg.event == PM_EVENT_FREEZE || + msg.event == PM_EVENT_PRETHAW)) + goto done; status = usb_suspend_device(udev, msg); + } /* If the suspend failed, resume interfaces that did get suspended */ if (status != 0) { while (--i >= 0) { intf = udev->actconfig->interface[i]; - usb_resume_interface(intf); + usb_resume_interface(intf, 0); } /* Try another autosuspend when the interfaces aren't busy */ @@ -1076,7 +1119,7 @@ static int usb_suspend_both(struct usb_device *udev, pm_message_t msg) } done: - // dev_dbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status); + dev_vdbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status); return status; } @@ -1131,7 +1174,8 @@ static int usb_resume_both(struct usb_device *udev) status = usb_autoresume_device(parent); if (status == 0) { status = usb_resume_device(udev); - if (status) { + if (status || udev->state == + USB_STATE_NOTATTACHED) { usb_autosuspend_device(parent); /* It's possible usb_resume_device() @@ -1152,28 +1196,25 @@ static int usb_resume_both(struct usb_device *udev) /* We can't progagate beyond the USB subsystem, * so if a root hub's controller is suspended * then we're stuck. */ - if (udev->dev.parent->power.power_state.event != - PM_EVENT_ON) - status = -EHOSTUNREACH; - else - status = usb_resume_device(udev); + status = usb_resume_device(udev); } } else { - /* Needed only for setting udev->dev.power.power_state.event - * and for possible debugging message. */ + /* Needed for setting udev->dev.power.power_state.event, + * for possible debugging message, and for reset_resume. */ status = usb_resume_device(udev); } if (status == 0 && udev->actconfig) { for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { intf = udev->actconfig->interface[i]; - usb_resume_interface(intf); + usb_resume_interface(intf, udev->reset_resume); } } done: - // dev_dbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status); + dev_vdbg(&udev->dev, "%s: status %d\n", __FUNCTION__, status); + udev->reset_resume = 0; return status; } @@ -1240,8 +1281,8 @@ void usb_autosuspend_device(struct usb_device *udev) int status; status = usb_autopm_do_device(udev, -1); - // dev_dbg(&udev->dev, "%s: cnt %d\n", - // __FUNCTION__, udev->pm_usage_cnt); + dev_vdbg(&udev->dev, "%s: cnt %d\n", + __FUNCTION__, udev->pm_usage_cnt); } /** @@ -1260,8 +1301,8 @@ void usb_autosuspend_device(struct usb_device *udev) void usb_try_autosuspend_device(struct usb_device *udev) { usb_autopm_do_device(udev, 0); - // dev_dbg(&udev->dev, "%s: cnt %d\n", - // __FUNCTION__, udev->pm_usage_cnt); + dev_vdbg(&udev->dev, "%s: cnt %d\n", + __FUNCTION__, udev->pm_usage_cnt); } /** @@ -1288,8 +1329,8 @@ int usb_autoresume_device(struct usb_device *udev) int status; status = usb_autopm_do_device(udev, 1); - // dev_dbg(&udev->dev, "%s: status %d cnt %d\n", - // __FUNCTION__, status, udev->pm_usage_cnt); + dev_vdbg(&udev->dev, "%s: status %d cnt %d\n", + __FUNCTION__, status, udev->pm_usage_cnt); return status; } @@ -1361,8 +1402,8 @@ void usb_autopm_put_interface(struct usb_interface *intf) int status; status = usb_autopm_do_interface(intf, -1); - // dev_dbg(&intf->dev, "%s: status %d cnt %d\n", - // __FUNCTION__, status, intf->pm_usage_cnt); + dev_vdbg(&intf->dev, "%s: status %d cnt %d\n", + __FUNCTION__, status, intf->pm_usage_cnt); } EXPORT_SYMBOL_GPL(usb_autopm_put_interface); @@ -1405,8 +1446,8 @@ int usb_autopm_get_interface(struct usb_interface *intf) int status; status = usb_autopm_do_interface(intf, 1); - // dev_dbg(&intf->dev, "%s: status %d cnt %d\n", - // __FUNCTION__, status, intf->pm_usage_cnt); + dev_vdbg(&intf->dev, "%s: status %d cnt %d\n", + __FUNCTION__, status, intf->pm_usage_cnt); return status; } EXPORT_SYMBOL_GPL(usb_autopm_get_interface); @@ -1427,8 +1468,8 @@ int usb_autopm_set_interface(struct usb_interface *intf) int status; status = usb_autopm_do_interface(intf, 0); - // dev_dbg(&intf->dev, "%s: status %d cnt %d\n", - // __FUNCTION__, status, intf->pm_usage_cnt); + dev_vdbg(&intf->dev, "%s: status %d cnt %d\n", + __FUNCTION__, status, intf->pm_usage_cnt); return status; } EXPORT_SYMBOL_GPL(usb_autopm_set_interface); @@ -1508,8 +1549,15 @@ static int usb_resume(struct device *dev) if (!is_usb_device(dev)) /* Ignore PM for interfaces */ return 0; udev = to_usb_device(dev); - if (udev->autoresume_disabled) - return -EPERM; + + /* If autoresume is disabled then we also want to prevent resume + * during system wakeup. However, a "persistent-device" reset-resume + * after power loss counts as a wakeup event. So allow a + * reset-resume to occur if remote wakeup is enabled. */ + if (udev->autoresume_disabled) { + if (!(udev->reset_resume && udev->do_remote_wakeup)) + return -EPERM; + } return usb_external_resume_device(udev); } diff --git a/drivers/usb/core/file.c b/drivers/usb/core/file.c index 01c857ac27af..5d860bc9b421 100644 --- a/drivers/usb/core/file.c +++ b/drivers/usb/core/file.c @@ -16,15 +16,15 @@ */ #include <linux/module.h> -#include <linux/spinlock.h> #include <linux/errno.h> +#include <linux/rwsem.h> #include <linux/usb.h> #include "usb.h" #define MAX_USB_MINORS 256 static const struct file_operations *usb_minors[MAX_USB_MINORS]; -static DEFINE_SPINLOCK(minor_lock); +static DECLARE_RWSEM(minor_rwsem); static int usb_open(struct inode * inode, struct file * file) { @@ -33,14 +33,11 @@ static int usb_open(struct inode * inode, struct file * file) int err = -ENODEV; const struct file_operations *old_fops, *new_fops = NULL; - spin_lock (&minor_lock); + down_read(&minor_rwsem); c = usb_minors[minor]; - if (!c || !(new_fops = fops_get(c))) { - spin_unlock(&minor_lock); - return err; - } - spin_unlock(&minor_lock); + if (!c || !(new_fops = fops_get(c))) + goto done; old_fops = file->f_op; file->f_op = new_fops; @@ -52,6 +49,8 @@ static int usb_open(struct inode * inode, struct file * file) file->f_op = fops_get(old_fops); } fops_put(old_fops); + done: + up_read(&minor_rwsem); return err; } @@ -166,7 +165,7 @@ int usb_register_dev(struct usb_interface *intf, if (class_driver->fops == NULL) goto exit; - spin_lock (&minor_lock); + down_write(&minor_rwsem); for (minor = minor_base; minor < MAX_USB_MINORS; ++minor) { if (usb_minors[minor]) continue; @@ -176,7 +175,7 @@ int usb_register_dev(struct usb_interface *intf, retval = 0; break; } - spin_unlock (&minor_lock); + up_write(&minor_rwsem); if (retval) goto exit; @@ -197,9 +196,9 @@ int usb_register_dev(struct usb_interface *intf, intf->usb_dev = device_create(usb_class->class, &intf->dev, MKDEV(USB_MAJOR, minor), "%s", temp); if (IS_ERR(intf->usb_dev)) { - spin_lock (&minor_lock); + down_write(&minor_rwsem); usb_minors[intf->minor] = NULL; - spin_unlock (&minor_lock); + up_write(&minor_rwsem); retval = PTR_ERR(intf->usb_dev); } exit: @@ -236,9 +235,9 @@ void usb_deregister_dev(struct usb_interface *intf, dbg ("removing %d minor", intf->minor); - spin_lock (&minor_lock); + down_write(&minor_rwsem); usb_minors[intf->minor] = NULL; - spin_unlock (&minor_lock); + up_write(&minor_rwsem); snprintf(name, BUS_ID_SIZE, class_driver->name, intf->minor - minor_base); device_destroy(usb_class->class, MKDEV(USB_MAJOR, intf->minor)); @@ -247,5 +246,3 @@ void usb_deregister_dev(struct usb_interface *intf, destroy_usb_class(); } EXPORT_SYMBOL(usb_deregister_dev); - - diff --git a/drivers/usb/core/generic.c b/drivers/usb/core/generic.c index 9bbcb20e2d94..b2fc2b115256 100644 --- a/drivers/usb/core/generic.c +++ b/drivers/usb/core/generic.c @@ -19,6 +19,7 @@ #include <linux/usb.h> #include "usb.h" +#include "hcd.h" static inline const char *plural(int n) { @@ -193,16 +194,34 @@ static void generic_disconnect(struct usb_device *udev) static int generic_suspend(struct usb_device *udev, pm_message_t msg) { - /* USB devices enter SUSPEND state through their hubs, but can be - * marked for FREEZE as soon as their children are already idled. - * But those semantics are useless, so we equate the two (sigh). + int rc; + + /* Normal USB devices suspend through their upstream port. + * Root hubs don't have upstream ports to suspend, + * so we have to shut down their downstream HC-to-USB + * interfaces manually by doing a bus (or "global") suspend. */ - return usb_port_suspend(udev); + if (!udev->parent) + rc = hcd_bus_suspend(udev); + else + rc = usb_port_suspend(udev); + return rc; } static int generic_resume(struct usb_device *udev) { - return usb_port_resume(udev); + int rc; + + /* Normal USB devices resume/reset through their upstream port. + * Root hubs don't have upstream ports to resume or reset, + * so we have to start up their downstream HC-to-USB + * interfaces manually by doing a bus (or "global") resume. + */ + if (!udev->parent) + rc = hcd_bus_resume(udev); + else + rc = usb_port_resume(udev); + return rc; } #endif /* CONFIG_PM */ diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c index edf4300a3f7a..5cf6d5f9acbd 100644 --- a/drivers/usb/core/hcd-pci.c +++ b/drivers/usb/core/hcd-pci.c @@ -207,7 +207,8 @@ int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t message) * We must ignore the FREEZE vs SUSPEND distinction here, because * otherwise the swsusp will save (and restore) garbage state. */ - if (hcd->self.root_hub->dev.power.power_state.event == PM_EVENT_ON) + if (!(hcd->state == HC_STATE_SUSPENDED || + hcd->state == HC_STATE_HALT)) return -EBUSY; if (hcd->driver->suspend) { diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index 8969e42434b9..963520fbef90 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -582,10 +582,12 @@ void usb_hcd_poll_rh_status(struct usb_hcd *hcd) } /* The USB 2.0 spec says 256 ms. This is close enough and won't - * exceed that limit if HZ is 100. */ + * exceed that limit if HZ is 100. The math is more clunky than + * maybe expected, this is to make sure that all timers for USB devices + * fire at the same time to give the CPU a break inbetween */ if (hcd->uses_new_polling ? hcd->poll_rh : (length == 0 && hcd->status_urb != NULL)) - mod_timer (&hcd->rh_timer, jiffies + msecs_to_jiffies(250)); + mod_timer (&hcd->rh_timer, (jiffies/(HZ/4) + 1) * (HZ/4)); } EXPORT_SYMBOL_GPL(usb_hcd_poll_rh_status); @@ -614,8 +616,8 @@ static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb) urb->hcpriv = hcd; /* indicate it's queued */ if (!hcd->uses_new_polling) - mod_timer (&hcd->rh_timer, jiffies + - msecs_to_jiffies(250)); + mod_timer (&hcd->rh_timer, + (jiffies/(HZ/4) + 1) * (HZ/4)); /* If a status change has already occurred, report it ASAP */ else if (hcd->poll_pending) @@ -901,17 +903,32 @@ EXPORT_SYMBOL (usb_calc_bus_time); /*-------------------------------------------------------------------------*/ -static void urb_unlink (struct urb *urb) +static void urb_unlink(struct usb_hcd *hcd, struct urb *urb) { unsigned long flags; + int at_root_hub = (urb->dev == hcd->self.root_hub); /* clear all state linking urb to this dev (and hcd) */ - spin_lock_irqsave (&hcd_data_lock, flags); list_del_init (&urb->urb_list); spin_unlock_irqrestore (&hcd_data_lock, flags); -} + if (hcd->self.uses_dma && !at_root_hub) { + if (usb_pipecontrol (urb->pipe) + && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP)) + dma_unmap_single (hcd->self.controller, urb->setup_dma, + sizeof (struct usb_ctrlrequest), + DMA_TO_DEVICE); + if (urb->transfer_buffer_length != 0 + && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) + dma_unmap_single (hcd->self.controller, + urb->transfer_dma, + urb->transfer_buffer_length, + usb_pipein (urb->pipe) + ? DMA_FROM_DEVICE + : DMA_TO_DEVICE); + } +} /* may be called in any context with a valid urb->dev usecount * caller surrenders "ownership" of urb @@ -948,19 +965,9 @@ int usb_hcd_submit_urb (struct urb *urb, gfp_t mem_flags) else switch (hcd->state) { case HC_STATE_RUNNING: case HC_STATE_RESUMING: -doit: list_add_tail (&urb->urb_list, &ep->urb_list); status = 0; break; - case HC_STATE_SUSPENDED: - /* HC upstream links (register access, wakeup signaling) can work - * even when the downstream links (and DMA etc) are quiesced; let - * usbcore talk to the root hub. - */ - if (hcd->self.controller->power.power_state.event == PM_EVENT_ON - && urb->dev->parent == NULL) - goto doit; - /* FALL THROUGH */ default: status = -ESHUTDOWN; break; @@ -1014,7 +1021,7 @@ doit: status = hcd->driver->urb_enqueue (hcd, ep, urb, mem_flags); done: if (unlikely (status)) { - urb_unlink (urb); + urb_unlink(hcd, urb); atomic_dec (&urb->use_count); if (urb->reject) wake_up (&usb_kill_urb_queue); @@ -1255,42 +1262,59 @@ rescan: #ifdef CONFIG_PM -int hcd_bus_suspend (struct usb_bus *bus) +int hcd_bus_suspend(struct usb_device *rhdev) { - struct usb_hcd *hcd; - int status; + struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self); + int status; + int old_state = hcd->state; - hcd = container_of (bus, struct usb_hcd, self); - if (!hcd->driver->bus_suspend) - return -ENOENT; - hcd->state = HC_STATE_QUIESCING; - status = hcd->driver->bus_suspend (hcd); - if (status == 0) + dev_dbg(&rhdev->dev, "bus %s%s\n", + rhdev->auto_pm ? "auto-" : "", "suspend"); + if (!hcd->driver->bus_suspend) { + status = -ENOENT; + } else { + hcd->state = HC_STATE_QUIESCING; + status = hcd->driver->bus_suspend(hcd); + } + if (status == 0) { + usb_set_device_state(rhdev, USB_STATE_SUSPENDED); hcd->state = HC_STATE_SUSPENDED; - else - dev_dbg(&bus->root_hub->dev, "%s fail, err %d\n", + } else { + hcd->state = old_state; + dev_dbg(&rhdev->dev, "bus %s fail, err %d\n", "suspend", status); + } return status; } -int hcd_bus_resume (struct usb_bus *bus) +int hcd_bus_resume(struct usb_device *rhdev) { - struct usb_hcd *hcd; - int status; + struct usb_hcd *hcd = container_of(rhdev->bus, struct usb_hcd, self); + int status; + int old_state = hcd->state; - hcd = container_of (bus, struct usb_hcd, self); + dev_dbg(&rhdev->dev, "usb %s%s\n", + rhdev->auto_pm ? "auto-" : "", "resume"); if (!hcd->driver->bus_resume) return -ENOENT; if (hcd->state == HC_STATE_RUNNING) return 0; + hcd->state = HC_STATE_RESUMING; - status = hcd->driver->bus_resume (hcd); - if (status == 0) + status = hcd->driver->bus_resume(hcd); + if (status == 0) { + /* TRSMRCY = 10 msec */ + msleep(10); + usb_set_device_state(rhdev, rhdev->actconfig + ? USB_STATE_CONFIGURED + : USB_STATE_ADDRESS); hcd->state = HC_STATE_RUNNING; - else { - dev_dbg(&bus->root_hub->dev, "%s fail, err %d\n", + } else { + hcd->state = old_state; + dev_dbg(&rhdev->dev, "bus %s fail, err %d\n", "resume", status); - usb_hc_died(hcd); + if (status != -ESHUTDOWN) + usb_hc_died(hcd); } return status; } @@ -1384,30 +1408,10 @@ EXPORT_SYMBOL (usb_bus_start_enum); */ void usb_hcd_giveback_urb (struct usb_hcd *hcd, struct urb *urb) { - int at_root_hub; - - at_root_hub = (urb->dev == hcd->self.root_hub); - urb_unlink (urb); - - /* lower level hcd code should use *_dma exclusively if the - * host controller does DMA */ - if (hcd->self.uses_dma && !at_root_hub) { - if (usb_pipecontrol (urb->pipe) - && !(urb->transfer_flags & URB_NO_SETUP_DMA_MAP)) - dma_unmap_single (hcd->self.controller, urb->setup_dma, - sizeof (struct usb_ctrlrequest), - DMA_TO_DEVICE); - if (urb->transfer_buffer_length != 0 - && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)) - dma_unmap_single (hcd->self.controller, - urb->transfer_dma, - urb->transfer_buffer_length, - usb_pipein (urb->pipe) - ? DMA_FROM_DEVICE - : DMA_TO_DEVICE); - } - + urb_unlink(hcd, urb); usbmon_urb_complete (&hcd->self, urb); + usb_unanchor_urb(urb); + /* pass ownership to the completion handler */ urb->complete (urb); atomic_dec (&urb->use_count); diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h index ef50fa494e47..b5ebb73c2332 100644 --- a/drivers/usb/core/hcd.h +++ b/drivers/usb/core/hcd.h @@ -364,23 +364,13 @@ extern int usb_find_interface_driver (struct usb_device *dev, #ifdef CONFIG_PM extern void usb_hcd_resume_root_hub (struct usb_hcd *hcd); extern void usb_root_hub_lost_power (struct usb_device *rhdev); -extern int hcd_bus_suspend (struct usb_bus *bus); -extern int hcd_bus_resume (struct usb_bus *bus); +extern int hcd_bus_suspend(struct usb_device *rhdev); +extern int hcd_bus_resume(struct usb_device *rhdev); #else static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd) { return; } - -static inline int hcd_bus_suspend(struct usb_bus *bus) -{ - return 0; -} - -static inline int hcd_bus_resume (struct usb_bus *bus) -{ - return 0; -} #endif /* CONFIG_PM */ /* diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 24f10a19dbdb..fd74c50b1804 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -31,9 +31,16 @@ #include "hcd.h" #include "hub.h" +#ifdef CONFIG_USB_PERSIST +#define USB_PERSIST 1 +#else +#define USB_PERSIST 0 +#endif + struct usb_hub { struct device *intfdev; /* the "interface" device */ struct usb_device *hdev; + struct kref kref; struct urb *urb; /* for interrupt polling pipe */ /* buffer for urb ... with extra space in case of babble */ @@ -66,6 +73,7 @@ struct usb_hub { unsigned limited_power:1; unsigned quiescing:1; unsigned activating:1; + unsigned disconnected:1; unsigned has_indicators:1; u8 indicator[USB_MAXCHILDREN]; @@ -321,7 +329,7 @@ static void kick_khubd(struct usb_hub *hub) to_usb_interface(hub->intfdev)->pm_usage_cnt = 1; spin_lock_irqsave(&hub_event_lock, flags); - if (list_empty(&hub->event_list)) { + if (!hub->disconnected & list_empty(&hub->event_list)) { list_add_tail(&hub->event_list, &hub_event_list); wake_up(&khubd_wait); } @@ -330,6 +338,7 @@ static void kick_khubd(struct usb_hub *hub) void usb_kick_khubd(struct usb_device *hdev) { + /* FIXME: What if hdev isn't bound to the hub driver? */ kick_khubd(hdev_to_hub(hdev)); } @@ -400,9 +409,10 @@ static void hub_tt_kevent (struct work_struct *work) struct usb_hub *hub = container_of(work, struct usb_hub, tt.kevent); unsigned long flags; + int limit = 100; spin_lock_irqsave (&hub->tt.lock, flags); - while (!list_empty (&hub->tt.clear_list)) { + while (--limit && !list_empty (&hub->tt.clear_list)) { struct list_head *temp; struct usb_tt_clear *clear; struct usb_device *hdev = hub->hdev; @@ -550,48 +560,68 @@ static int hub_hub_status(struct usb_hub *hub, static int hub_port_disable(struct usb_hub *hub, int port1, int set_state) { struct usb_device *hdev = hub->hdev; - int ret; + int ret = 0; - if (hdev->children[port1-1] && set_state) { + if (hdev->children[port1-1] && set_state) usb_set_device_state(hdev->children[port1-1], USB_STATE_NOTATTACHED); - } - ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); + if (!hub->error) + ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE); if (ret) dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n", - port1, ret); - + port1, ret); return ret; } +/* + * Disable a port and mark a logical connnect-change event, so that some + * time later khubd will disconnect() any existing usb_device on the port + * and will re-enumerate if there actually is a device attached. + */ +static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) +{ + dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); + hub_port_disable(hub, port1, 1); + + /* FIXME let caller ask to power down the port: + * - some devices won't enumerate without a VBUS power cycle + * - SRP saves power that way + * - ... new call, TBD ... + * That's easy if this hub can switch power per-port, and + * khubd reactivates the port later (timer, SRP, etc). + * Powerdown must be optional, because of reset/DFU. + */ + + set_bit(port1, hub->change_bits); + kick_khubd(hub); +} /* caller has locked the hub device */ -static void hub_pre_reset(struct usb_interface *intf) +static int hub_pre_reset(struct usb_interface *intf) { struct usb_hub *hub = usb_get_intfdata(intf); struct usb_device *hdev = hub->hdev; - int port1; + int i; - for (port1 = 1; port1 <= hdev->maxchild; ++port1) { - if (hdev->children[port1 - 1]) { - usb_disconnect(&hdev->children[port1 - 1]); - if (hub->error == 0) - hub_port_disable(hub, port1, 0); - } + /* Disconnect all the children */ + for (i = 0; i < hdev->maxchild; ++i) { + if (hdev->children[i]) + usb_disconnect(&hdev->children[i]); } hub_quiesce(hub); + return 0; } /* caller has locked the hub device */ -static void hub_post_reset(struct usb_interface *intf) +static int hub_post_reset(struct usb_interface *intf) { struct usb_hub *hub = usb_get_intfdata(intf); - hub_activate(hub); hub_power_on(hub); + hub_activate(hub); + return 0; } - static int hub_configure(struct usb_hub *hub, struct usb_endpoint_descriptor *endpoint) { @@ -845,43 +875,42 @@ fail: return ret; } +static void hub_release(struct kref *kref) +{ + struct usb_hub *hub = container_of(kref, struct usb_hub, kref); + + usb_put_intf(to_usb_interface(hub->intfdev)); + kfree(hub); +} + static unsigned highspeed_hubs; static void hub_disconnect(struct usb_interface *intf) { struct usb_hub *hub = usb_get_intfdata (intf); - struct usb_device *hdev; + + /* Take the hub off the event list and don't let it be added again */ + spin_lock_irq(&hub_event_lock); + list_del_init(&hub->event_list); + hub->disconnected = 1; + spin_unlock_irq(&hub_event_lock); /* Disconnect all children and quiesce the hub */ hub->error = 0; hub_pre_reset(intf); usb_set_intfdata (intf, NULL); - hdev = hub->hdev; - if (hdev->speed == USB_SPEED_HIGH) + if (hub->hdev->speed == USB_SPEED_HIGH) highspeed_hubs--; usb_free_urb(hub->urb); - hub->urb = NULL; - - spin_lock_irq(&hub_event_lock); - list_del_init(&hub->event_list); - spin_unlock_irq(&hub_event_lock); - kfree(hub->descriptor); - hub->descriptor = NULL; - kfree(hub->status); - hub->status = NULL; - - if (hub->buffer) { - usb_buffer_free(hdev, sizeof(*hub->buffer), hub->buffer, - hub->buffer_dma); - hub->buffer = NULL; - } + usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer, + hub->buffer_dma); - kfree(hub); + kref_put(&hub->kref, hub_release); } static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) @@ -929,10 +958,12 @@ descriptor_error: return -ENOMEM; } + kref_init(&hub->kref); INIT_LIST_HEAD(&hub->event_list); hub->intfdev = &intf->dev; hub->hdev = hdev; INIT_DELAYED_WORK(&hub->leds, led_work); + usb_get_intf(intf); usb_set_intfdata (intf, hub); intf->needs_remote_wakeup = 1; @@ -982,49 +1013,6 @@ hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data) } -/* grab device/port lock, returning index of that port (zero based). - * protects the upstream link used by this device from concurrent - * tree operations like suspend, resume, reset, and disconnect, which - * apply to everything downstream of a given port. - */ -static int locktree(struct usb_device *udev) -{ - int t; - struct usb_device *hdev; - - if (!udev) - return -ENODEV; - - /* root hub is always the first lock in the series */ - hdev = udev->parent; - if (!hdev) { - usb_lock_device(udev); - return 0; - } - - /* on the path from root to us, lock everything from - * top down, dropping parent locks when not needed - */ - t = locktree(hdev); - if (t < 0) - return t; - - /* everything is fail-fast once disconnect - * processing starts - */ - if (udev->state == USB_STATE_NOTATTACHED) { - usb_unlock_device(hdev); - return -ENODEV; - } - - /* when everyone grabs locks top->bottom, - * non-overlapping work may be concurrent - */ - usb_lock_device(udev); - usb_unlock_device(hdev); - return udev->portnum; -} - static void recursively_mark_NOTATTACHED(struct usb_device *udev) { int i; @@ -1089,46 +1077,6 @@ void usb_set_device_state(struct usb_device *udev, spin_unlock_irqrestore(&device_state_lock, flags); } - -#ifdef CONFIG_PM - -/** - * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power - * @rhdev: struct usb_device for the root hub - * - * The USB host controller driver calls this function when its root hub - * is resumed and Vbus power has been interrupted or the controller - * has been reset. The routine marks all the children of the root hub - * as NOTATTACHED and marks logical connect-change events on their ports. - */ -void usb_root_hub_lost_power(struct usb_device *rhdev) -{ - struct usb_hub *hub; - int port1; - unsigned long flags; - - dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); - - /* Make sure no potential wakeup events get lost, - * by forcing the root hub to be resumed. - */ - rhdev->dev.power.prev_state.event = PM_EVENT_ON; - - spin_lock_irqsave(&device_state_lock, flags); - hub = hdev_to_hub(rhdev); - for (port1 = 1; port1 <= rhdev->maxchild; ++port1) { - if (rhdev->children[port1 - 1]) { - recursively_mark_NOTATTACHED( - rhdev->children[port1 - 1]); - set_bit(port1, hub->change_bits); - } - } - spin_unlock_irqrestore(&device_state_lock, flags); -} -EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); - -#endif /* CONFIG_PM */ - static void choose_address(struct usb_device *udev) { int devnum; @@ -1269,7 +1217,6 @@ static inline void show_string(struct usb_device *udev, char *id, char *string) #ifdef CONFIG_USB_OTG #include "otg_whitelist.h" -static int __usb_port_suspend(struct usb_device *, int port1); #endif /** @@ -1375,11 +1322,11 @@ int usb_new_device(struct usb_device *udev) * (Includes HNP test device.) */ if (udev->bus->b_hnp_enable || udev->bus->is_b_host) { - err = __usb_port_suspend(udev, udev->bus->otg_port); + err = usb_port_suspend(udev); if (err < 0) dev_dbg(&udev->dev, "HNP fail, %d\n", err); } - err = -ENODEV; + err = -ENOTSUPP; goto fail; } #endif @@ -1476,9 +1423,9 @@ static int hub_port_wait_reset(struct usb_hub *hub, int port1, if (!(portstatus & USB_PORT_STAT_CONNECTION)) return -ENOTCONN; - /* bomb out completely if something weird happened */ + /* bomb out completely if the connection bounced */ if ((portchange & USB_PORT_STAT_C_CONNECTION)) - return -EINVAL; + return -ENOTCONN; /* if we`ve finished resetting, then break out of the loop */ if (!(portstatus & USB_PORT_STAT_RESET) && @@ -1557,34 +1504,24 @@ static int hub_port_reset(struct usb_hub *hub, int port1, return status; } -/* - * Disable a port and mark a logical connnect-change event, so that some - * time later khubd will disconnect() any existing usb_device on the port - * and will re-enumerate if there actually is a device attached. - */ -static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) -{ - dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1); - hub_port_disable(hub, port1, 1); - - /* FIXME let caller ask to power down the port: - * - some devices won't enumerate without a VBUS power cycle - * - SRP saves power that way - * - ... new call, TBD ... - * That's easy if this hub can switch power per-port, and - * khubd reactivates the port later (timer, SRP, etc). - * Powerdown must be optional, because of reset/DFU. - */ - - set_bit(port1, hub->change_bits); - kick_khubd(hub); -} - #ifdef CONFIG_PM #ifdef CONFIG_USB_SUSPEND /* + * usb_port_suspend - suspend a usb device's upstream port + * @udev: device that's no longer in active use, not a root hub + * Context: must be able to sleep; device not locked; pm locks held + * + * Suspends a USB device that isn't in active use, conserving power. + * Devices may wake out of a suspend, if anything important happens, + * using the remote wakeup mechanism. They may also be taken out of + * suspend by the host, using usb_port_resume(). It's also routine + * to disconnect devices while they are suspended. + * + * This only affects the USB hardware for a device; its interfaces + * (and, for hubs, child devices) must already have been suspended. + * * Selective port suspend reduces power; most suspended devices draw * less than 500 uA. It's also used in OTG, along with remote wakeup. * All devices below the suspended port are also suspended. @@ -1593,11 +1530,35 @@ static void hub_port_logical_disconnect(struct usb_hub *hub, int port1) * also support "remote wakeup", where the device can activate the USB * tree above them to deliver data, such as a keypress or packet. In * some cases, this wakes the USB host. + * + * Suspending OTG devices may trigger HNP, if that's been enabled + * between a pair of dual-role devices. That will change roles, such + * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. + * + * Devices on USB hub ports have only one "suspend" state, corresponding + * to ACPI D2, "may cause the device to lose some context". + * State transitions include: + * + * - suspend, resume ... when the VBUS power link stays live + * - suspend, disconnect ... VBUS lost + * + * Once VBUS drop breaks the circuit, the port it's using has to go through + * normal re-enumeration procedures, starting with enabling VBUS power. + * Other than re-initializing the hub (plug/unplug, except for root hubs), + * Linux (2.6) currently has NO mechanisms to initiate that: no khubd + * timer, no SRP, no requests through sysfs. + * + * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when + * the root hub for their bus goes into global suspend ... so we don't + * (falsely) update the device power state to say it suspended. + * + * Returns 0 on success, else negative errno. */ -static int hub_port_suspend(struct usb_hub *hub, int port1, - struct usb_device *udev) +int usb_port_suspend(struct usb_device *udev) { - int status; + struct usb_hub *hub = hdev_to_hub(udev->parent); + int port1 = udev->portnum; + int status; // dev_dbg(hub->intfdev, "suspend port %d\n", port1); @@ -1614,17 +1575,15 @@ static int hub_port_suspend(struct usb_hub *hub, int port1, NULL, 0, USB_CTRL_SET_TIMEOUT); if (status) - dev_dbg(&udev->dev, - "won't remote wakeup, status %d\n", - status); + dev_dbg(&udev->dev, "won't remote wakeup, status %d\n", + status); } /* see 7.1.7.6 */ status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); if (status) { - dev_dbg(hub->intfdev, - "can't suspend port %d, status %d\n", - port1, status); + dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n", + port1, status); /* paranoia: "should not happen" */ (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0), USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE, @@ -1642,85 +1601,24 @@ static int hub_port_suspend(struct usb_hub *hub, int port1, } /* - * Devices on USB hub ports have only one "suspend" state, corresponding - * to ACPI D2, "may cause the device to lose some context". - * State transitions include: - * - * - suspend, resume ... when the VBUS power link stays live - * - suspend, disconnect ... VBUS lost - * - * Once VBUS drop breaks the circuit, the port it's using has to go through - * normal re-enumeration procedures, starting with enabling VBUS power. - * Other than re-initializing the hub (plug/unplug, except for root hubs), - * Linux (2.6) currently has NO mechanisms to initiate that: no khubd - * timer, no SRP, no requests through sysfs. - * - * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when - * the root hub for their bus goes into global suspend ... so we don't - * (falsely) update the device power state to say it suspended. - */ -static int __usb_port_suspend (struct usb_device *udev, int port1) -{ - int status = 0; - - /* caller owns the udev device lock */ - if (port1 < 0) - return port1; - - /* we change the device's upstream USB link, - * but root hubs have no upstream USB link. - */ - if (udev->parent) - status = hub_port_suspend(hdev_to_hub(udev->parent), port1, - udev); - else { - dev_dbg(&udev->dev, "usb %ssuspend\n", - udev->auto_pm ? "auto-" : ""); - usb_set_device_state(udev, USB_STATE_SUSPENDED); - } - return status; -} - -/* - * usb_port_suspend - suspend a usb device's upstream port - * @udev: device that's no longer in active use - * Context: must be able to sleep; device not locked; pm locks held - * - * Suspends a USB device that isn't in active use, conserving power. - * Devices may wake out of a suspend, if anything important happens, - * using the remote wakeup mechanism. They may also be taken out of - * suspend by the host, using usb_port_resume(). It's also routine - * to disconnect devices while they are suspended. - * - * This only affects the USB hardware for a device; its interfaces - * (and, for hubs, child devices) must already have been suspended. - * - * Suspending OTG devices may trigger HNP, if that's been enabled - * between a pair of dual-role devices. That will change roles, such - * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral. - * - * Returns 0 on success, else negative errno. - */ -int usb_port_suspend(struct usb_device *udev) -{ - return __usb_port_suspend(udev, udev->portnum); -} - -/* * If the USB "suspend" state is in use (rather than "global suspend"), * many devices will be individually taken out of suspend state using - * special" resume" signaling. These routines kick in shortly after + * special "resume" signaling. This routine kicks in shortly after * hardware resume signaling is finished, either because of selective * resume (by host) or remote wakeup (by device) ... now see what changed * in the tree that's rooted at this device. + * + * If @udev->reset_resume is set then the device is reset before the + * status check is done. */ static int finish_port_resume(struct usb_device *udev) { - int status; + int status = 0; u16 devstatus; /* caller owns the udev device lock */ - dev_dbg(&udev->dev, "finish resume\n"); + dev_dbg(&udev->dev, "finish %sresume\n", + udev->reset_resume ? "reset-" : ""); /* usb ch9 identifies four variants of SUSPENDED, based on what * state the device resumes to. Linux currently won't see the @@ -1731,22 +1629,30 @@ static int finish_port_resume(struct usb_device *udev) ? USB_STATE_CONFIGURED : USB_STATE_ADDRESS); + /* 10.5.4.5 says not to reset a suspended port if the attached + * device is enabled for remote wakeup. Hence the reset + * operation is carried out here, after the port has been + * resumed. + */ + if (udev->reset_resume) + status = usb_reset_device(udev); + /* 10.5.4.5 says be sure devices in the tree are still there. * For now let's assume the device didn't go crazy on resume, * and device drivers will know about any resume quirks. */ - status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); - if (status >= 0) - status = (status == 2 ? 0 : -ENODEV); + if (status == 0) { + status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus); + if (status >= 0) + status = (status == 2 ? 0 : -ENODEV); + } - if (status) - dev_dbg(&udev->dev, - "gone after usb resume? status %d\n", - status); - else if (udev->actconfig) { + if (status) { + dev_dbg(&udev->dev, "gone after usb resume? status %d\n", + status); + } else if (udev->actconfig) { le16_to_cpus(&devstatus); - if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) - && udev->parent) { + if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) { status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), USB_REQ_CLEAR_FEATURE, @@ -1759,19 +1665,52 @@ static int finish_port_resume(struct usb_device *udev) "wakeup, status %d\n", status); } status = 0; - - } else if (udev->devnum <= 0) { - dev_dbg(&udev->dev, "bogus resume!\n"); - status = -EINVAL; } return status; } -static int -hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev) +/* + * usb_port_resume - re-activate a suspended usb device's upstream port + * @udev: device to re-activate, not a root hub + * Context: must be able to sleep; device not locked; pm locks held + * + * This will re-activate the suspended device, increasing power usage + * while letting drivers communicate again with its endpoints. + * USB resume explicitly guarantees that the power session between + * the host and the device is the same as it was when the device + * suspended. + * + * If CONFIG_USB_PERSIST and @udev->reset_resume are both set then this + * routine won't check that the port is still enabled. Furthermore, + * if @udev->reset_resume is set then finish_port_resume() above will + * reset @udev. The end result is that a broken power session can be + * recovered and @udev will appear to persist across a loss of VBUS power. + * + * For example, if a host controller doesn't maintain VBUS suspend current + * during a system sleep or is reset when the system wakes up, all the USB + * power sessions below it will be broken. This is especially troublesome + * for mass-storage devices containing mounted filesystems, since the + * device will appear to have disconnected and all the memory mappings + * to it will be lost. Using the USB_PERSIST facility, the device can be + * made to appear as if it had not disconnected. + * + * This facility is inherently dangerous. Although usb_reset_device() + * makes every effort to insure that the same device is present after the + * reset as before, it cannot provide a 100% guarantee. Furthermore it's + * quite possible for a device to remain unaltered but its media to be + * changed. If the user replaces a flash memory card while the system is + * asleep, he will have only himself to blame when the filesystem on the + * new card is corrupted and the system crashes. + * + * Returns 0 on success, else negative errno. + */ +int usb_port_resume(struct usb_device *udev) { - int status; - u16 portchange, portstatus; + struct usb_hub *hub = hdev_to_hub(udev->parent); + int port1 = udev->portnum; + int status; + u16 portchange, portstatus; + unsigned mask_flags, want_flags; /* Skip the initial Clear-Suspend step for a remote wakeup */ status = hub_port_status(hub, port1, &portstatus, &portchange); @@ -1786,30 +1725,31 @@ hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev) status = clear_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND); if (status) { - dev_dbg(hub->intfdev, - "can't resume port %d, status %d\n", - port1, status); + dev_dbg(hub->intfdev, "can't resume port %d, status %d\n", + port1, status); } else { /* drive resume for at least 20 msec */ - if (udev) - dev_dbg(&udev->dev, "usb %sresume\n", - udev->auto_pm ? "auto-" : ""); + dev_dbg(&udev->dev, "usb %sresume\n", + udev->auto_pm ? "auto-" : ""); msleep(25); -#define LIVE_FLAGS ( USB_PORT_STAT_POWER \ - | USB_PORT_STAT_ENABLE \ - | USB_PORT_STAT_CONNECTION) - /* Virtual root hubs can trigger on GET_PORT_STATUS to * stop resume signaling. Then finish the resume * sequence. */ status = hub_port_status(hub, port1, &portstatus, &portchange); -SuspendCleared: - if (status < 0 - || (portstatus & LIVE_FLAGS) != LIVE_FLAGS - || (portstatus & USB_PORT_STAT_SUSPEND) != 0 - ) { + + SuspendCleared: + if (USB_PERSIST && udev->reset_resume) + want_flags = USB_PORT_STAT_POWER + | USB_PORT_STAT_CONNECTION; + else + want_flags = USB_PORT_STAT_POWER + | USB_PORT_STAT_CONNECTION + | USB_PORT_STAT_ENABLE; + mask_flags = want_flags | USB_PORT_STAT_SUSPEND; + + if (status < 0 || (portstatus & mask_flags) != want_flags) { dev_dbg(hub->intfdev, "port %d status %04x.%04x after resume, %d\n", port1, portchange, portstatus, status); @@ -1821,51 +1761,19 @@ SuspendCleared: USB_PORT_FEAT_C_SUSPEND); /* TRSMRCY = 10 msec */ msleep(10); - if (udev) - status = finish_port_resume(udev); } } - if (status < 0) - hub_port_logical_disconnect(hub, port1); clear_bit(port1, hub->busy_bits); if (!hub->hdev->parent && !hub->busy_bits[0]) usb_enable_root_hub_irq(hub->hdev->bus); - return status; -} - -/* - * usb_port_resume - re-activate a suspended usb device's upstream port - * @udev: device to re-activate - * Context: must be able to sleep; device not locked; pm locks held - * - * This will re-activate the suspended device, increasing power usage - * while letting drivers communicate again with its endpoints. - * USB resume explicitly guarantees that the power session between - * the host and the device is the same as it was when the device - * suspended. - * - * Returns 0 on success, else negative errno. - */ -int usb_port_resume(struct usb_device *udev) -{ - int status; - - /* we change the device's upstream USB link, - * but root hubs have no upstream USB link. - */ - if (udev->parent) { - // NOTE this fails if parent is also suspended... - status = hub_port_resume(hdev_to_hub(udev->parent), - udev->portnum, udev); - } else { - dev_dbg(&udev->dev, "usb %sresume\n", - udev->auto_pm ? "auto-" : ""); + if (status == 0) status = finish_port_resume(udev); - } - if (status < 0) + if (status < 0) { dev_dbg(&udev->dev, "can't resume, status %d\n", status); + hub_port_logical_disconnect(hub, port1); + } return status; } @@ -1892,21 +1800,16 @@ int usb_port_suspend(struct usb_device *udev) return 0; } -static inline int -finish_port_resume(struct usb_device *udev) -{ - return 0; -} - -static inline int -hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev) -{ - return 0; -} - int usb_port_resume(struct usb_device *udev) { - return 0; + int status = 0; + + /* However we may need to do a reset-resume */ + if (udev->reset_resume) { + dev_dbg(&udev->dev, "reset-resume\n"); + status = usb_reset_device(udev); + } + return status; } static inline int remote_wakeup(struct usb_device *udev) @@ -1921,7 +1824,6 @@ static int hub_suspend(struct usb_interface *intf, pm_message_t msg) struct usb_hub *hub = usb_get_intfdata (intf); struct usb_device *hdev = hub->hdev; unsigned port1; - int status = 0; /* fail if children aren't already suspended */ for (port1 = 1; port1 <= hdev->maxchild; port1++) { @@ -1947,49 +1849,75 @@ static int hub_suspend(struct usb_interface *intf, pm_message_t msg) /* stop khubd and related activity */ hub_quiesce(hub); - - /* "global suspend" of the downstream HC-to-USB interface */ - if (!hdev->parent) { - status = hcd_bus_suspend(hdev->bus); - if (status != 0) { - dev_dbg(&hdev->dev, "'global' suspend %d\n", status); - hub_activate(hub); - } - } - return status; + return 0; } static int hub_resume(struct usb_interface *intf) { struct usb_hub *hub = usb_get_intfdata (intf); - struct usb_device *hdev = hub->hdev; - int status; dev_dbg(&intf->dev, "%s\n", __FUNCTION__); - /* "global resume" of the downstream HC-to-USB interface */ - if (!hdev->parent) { - struct usb_bus *bus = hdev->bus; - if (bus) { - status = hcd_bus_resume (bus); - if (status) { - dev_dbg(&intf->dev, "'global' resume %d\n", - status); - return status; + /* tell khubd to look for changes on this hub */ + hub_activate(hub); + return 0; +} + +static int hub_reset_resume(struct usb_interface *intf) +{ + struct usb_hub *hub = usb_get_intfdata(intf); + struct usb_device *hdev = hub->hdev; + int port1; + + hub_power_on(hub); + + for (port1 = 1; port1 <= hdev->maxchild; ++port1) { + struct usb_device *child = hdev->children[port1-1]; + + if (child) { + + /* For "USB_PERSIST"-enabled children we must + * mark the child device for reset-resume and + * turn off the connect-change status to prevent + * khubd from disconnecting it later. + */ + if (USB_PERSIST && child->persist_enabled) { + child->reset_resume = 1; + clear_port_feature(hdev, port1, + USB_PORT_FEAT_C_CONNECTION); + + /* Otherwise we must disconnect the child, + * but as we may not lock the child device here + * we have to do a "logical" disconnect. + */ + } else { + hub_port_logical_disconnect(hub, port1); } - } else - return -EOPNOTSUPP; - if (status == 0) { - /* TRSMRCY = 10 msec */ - msleep(10); } } - /* tell khubd to look for changes on this hub */ hub_activate(hub); return 0; } +/** + * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power + * @rhdev: struct usb_device for the root hub + * + * The USB host controller driver calls this function when its root hub + * is resumed and Vbus power has been interrupted or the controller + * has been reset. The routine marks @rhdev as having lost power. When + * the hub driver is resumed it will take notice; if CONFIG_USB_PERSIST + * is enabled then it will carry out power-session recovery, otherwise + * it will disconnect all the child devices. + */ +void usb_root_hub_lost_power(struct usb_device *rhdev) +{ + dev_warn(&rhdev->dev, "root hub lost power or was reset\n"); + rhdev->reset_resume = 1; +} +EXPORT_SYMBOL_GPL(usb_root_hub_lost_power); + #else /* CONFIG_PM */ static inline int remote_wakeup(struct usb_device *udev) @@ -1997,8 +1925,9 @@ static inline int remote_wakeup(struct usb_device *udev) return 0; } -#define hub_suspend NULL -#define hub_resume NULL +#define hub_suspend NULL +#define hub_resume NULL +#define hub_reset_resume NULL #endif @@ -2461,19 +2390,6 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1, return; } -#ifdef CONFIG_USB_SUSPEND - /* If something is connected, but the port is suspended, wake it up. */ - if (portstatus & USB_PORT_STAT_SUSPEND) { - status = hub_port_resume(hub, port1, NULL); - if (status < 0) { - dev_dbg(hub_dev, - "can't clear suspend on port %d; %d\n", - port1, status); - goto done; - } - } -#endif - for (i = 0; i < SET_CONFIG_TRIES; i++) { struct usb_device *udev; @@ -2584,7 +2500,7 @@ loop: ep0_reinit(udev); release_address(udev); usb_put_dev(udev); - if (status == -ENOTCONN) + if ((status == -ENOTCONN) || (status == -ENOTSUPP)) break; } @@ -2625,10 +2541,12 @@ static void hub_events(void) list_del_init(tmp); hub = list_entry(tmp, struct usb_hub, event_list); - hdev = hub->hdev; - intf = to_usb_interface(hub->intfdev); - hub_dev = &intf->dev; + kref_get(&hub->kref); + spin_unlock_irq(&hub_event_lock); + hdev = hub->hdev; + hub_dev = hub->intfdev; + intf = to_usb_interface(hub_dev); dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n", hdev->state, hub->descriptor ? hub->descriptor->bNbrPorts @@ -2637,16 +2555,10 @@ static void hub_events(void) (u16) hub->change_bits[0], (u16) hub->event_bits[0]); - usb_get_intf(intf); - spin_unlock_irq(&hub_event_lock); - /* Lock the device, then check to see if we were * disconnected while waiting for the lock to succeed. */ - if (locktree(hdev) < 0) { - usb_put_intf(intf); - continue; - } - if (hub != usb_get_intfdata(intf)) + usb_lock_device(hdev); + if (unlikely(hub->disconnected)) goto loop; /* If the hub has died, clean up after it */ @@ -2809,13 +2721,14 @@ loop_autopm: usb_autopm_enable(intf); loop: usb_unlock_device(hdev); - usb_put_intf(intf); + kref_put(&hub->kref, hub_release); } /* end while (1) */ } static int hub_thread(void *__unused) { + set_freezable(); do { hub_events(); wait_event_interruptible(khubd_wait, @@ -2844,6 +2757,7 @@ static struct usb_driver hub_driver = { .disconnect = hub_disconnect, .suspend = hub_suspend, .resume = hub_resume, + .reset_resume = hub_reset_resume, .pre_reset = hub_pre_reset, .post_reset = hub_post_reset, .ioctl = hub_ioctl, @@ -2946,6 +2860,11 @@ static int config_descriptors_changed(struct usb_device *udev) * this from a driver probe() routine after downloading new firmware. * For calls that might not occur during probe(), drivers should lock * the device using usb_lock_device_for_reset(). + * + * Locking exception: This routine may also be called from within an + * autoresume handler. Such usage won't conflict with other tasks + * holding the device lock because these tasks should always call + * usb_autopm_resume_device(), thereby preventing any unwanted autoresume. */ int usb_reset_device(struct usb_device *udev) { @@ -2976,7 +2895,7 @@ int usb_reset_device(struct usb_device *udev) * Other endpoints will be handled by re-enumeration. */ ep0_reinit(udev); ret = hub_port_init(parent_hub, udev, port1, i); - if (ret >= 0) + if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV) break; } clear_bit(port1, parent_hub->busy_bits); @@ -3092,6 +3011,7 @@ int usb_reset_composite_device(struct usb_device *udev, drv = to_usb_driver(cintf->dev.driver); if (drv->pre_reset) (drv->pre_reset)(cintf); + /* FIXME: Unbind if pre_reset returns an error or isn't defined */ } } } @@ -3110,6 +3030,7 @@ int usb_reset_composite_device(struct usb_device *udev, drv = to_usb_driver(cintf->dev.driver); if (drv->post_reset) (drv->post_reset)(cintf); + /* FIXME: Unbind if post_reset returns an error or isn't defined */ } if (cintf != iface) up(&cintf->dev.sem); diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c index f9fed34bf7d8..530e854961ce 100644 --- a/drivers/usb/core/message.c +++ b/drivers/usb/core/message.c @@ -404,8 +404,6 @@ int usb_sg_init ( io->urbs [i]->complete = sg_complete; io->urbs [i]->context = io; - io->urbs [i]->status = -EINPROGRESS; - io->urbs [i]->actual_length = 0; /* * Some systems need to revert to PIO when DMA is temporarily @@ -499,7 +497,8 @@ void usb_sg_wait (struct usb_sg_request *io) /* queue the urbs. */ spin_lock_irq (&io->lock); - for (i = 0; i < entries && !io->status; i++) { + i = 0; + while (i < entries && !io->status) { int retval; io->urbs [i]->dev = io->dev; @@ -516,7 +515,6 @@ void usb_sg_wait (struct usb_sg_request *io) case -ENOMEM: io->urbs[i]->dev = NULL; retval = 0; - i--; yield (); break; @@ -527,6 +525,7 @@ void usb_sg_wait (struct usb_sg_request *io) * URBs are queued at once; N milliseconds? */ case 0: + ++i; cpu_relax (); break; @@ -1385,6 +1384,36 @@ struct device_type usb_if_device_type = { .uevent = usb_if_uevent, }; +static struct usb_interface_assoc_descriptor *find_iad(struct usb_device *dev, + struct usb_host_config *config, + u8 inum) +{ + struct usb_interface_assoc_descriptor *retval = NULL; + struct usb_interface_assoc_descriptor *intf_assoc; + int first_intf; + int last_intf; + int i; + + for (i = 0; (i < USB_MAXIADS && config->intf_assoc[i]); i++) { + intf_assoc = config->intf_assoc[i]; + if (intf_assoc->bInterfaceCount == 0) + continue; + + first_intf = intf_assoc->bFirstInterface; + last_intf = first_intf + (intf_assoc->bInterfaceCount - 1); + if (inum >= first_intf && inum <= last_intf) { + if (!retval) + retval = intf_assoc; + else + dev_err(&dev->dev, "Interface #%d referenced" + " by multiple IADs\n", inum); + } + } + + return retval; +} + + /* * usb_set_configuration - Makes a particular device setting be current * @dev: the device whose configuration is being updated @@ -1531,6 +1560,7 @@ free_interfaces: intfc = cp->intf_cache[i]; intf->altsetting = intfc->altsetting; intf->num_altsetting = intfc->num_altsetting; + intf->intf_assoc = find_iad(dev, cp, i); kref_get(&intfc->ref); alt = usb_altnum_to_altsetting(intf, 0); diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c index 739f520908aa..aa21b38a31ce 100644 --- a/drivers/usb/core/quirks.c +++ b/drivers/usb/core/quirks.c @@ -30,10 +30,28 @@ static const struct usb_device_id usb_quirk_list[] = { /* HP 5300/5370C scanner */ { USB_DEVICE(0x03f0, 0x0701), .driver_info = USB_QUIRK_STRING_FETCH_255 }, + /* Benq S2W 3300U */ + { USB_DEVICE(0x04a5, 0x20b0), .driver_info = USB_QUIRK_NO_AUTOSUSPEND }, + /* Seiko Epson Corp. Perfection 1200 */ + { USB_DEVICE(0x04b8, 0x0104), .driver_info = USB_QUIRK_NO_AUTOSUSPEND }, /* Seiko Epson Corp - Perfection 1670 */ { USB_DEVICE(0x04b8, 0x011f), .driver_info = USB_QUIRK_NO_AUTOSUSPEND }, + /* Samsung ML-2510 Series printer */ + { USB_DEVICE(0x04e8, 0x327e), .driver_info = USB_QUIRK_NO_AUTOSUSPEND }, /* Elsa MicroLink 56k (V.250) */ { USB_DEVICE(0x05cc, 0x2267), .driver_info = USB_QUIRK_NO_AUTOSUSPEND }, + /* Ultima Electronics Corp.*/ + { USB_DEVICE(0x05d8, 0x4005), .driver_info = USB_QUIRK_NO_AUTOSUSPEND }, + /* Umax [hex] Astra 3400U */ + { USB_DEVICE(0x1606, 0x0060), .driver_info = USB_QUIRK_NO_AUTOSUSPEND }, + + /* Philips PSC805 audio device */ + { USB_DEVICE(0x0471, 0x0155), .driver_info = USB_QUIRK_RESET_RESUME }, + + /* RIM Blackberry */ + { USB_DEVICE(0x0fca, 0x0001), .driver_info = USB_QUIRK_NO_AUTOSUSPEND }, + { USB_DEVICE(0x0fca, 0x0004), .driver_info = USB_QUIRK_NO_AUTOSUSPEND }, + { USB_DEVICE(0x0fca, 0x0006), .driver_info = USB_QUIRK_NO_AUTOSUSPEND }, { } /* terminating entry must be last */ }; diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c index be37c863fdfb..d47ae89154a7 100644 --- a/drivers/usb/core/sysfs.c +++ b/drivers/usb/core/sysfs.c @@ -169,6 +169,73 @@ show_quirks(struct device *dev, struct device_attribute *attr, char *buf) } static DEVICE_ATTR(quirks, S_IRUGO, show_quirks, NULL); + +#if defined(CONFIG_USB_PERSIST) || defined(CONFIG_USB_SUSPEND) +static const char power_group[] = "power"; +#endif + +#ifdef CONFIG_USB_PERSIST + +static ssize_t +show_persist(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct usb_device *udev = to_usb_device(dev); + + return sprintf(buf, "%d\n", udev->persist_enabled); +} + +static ssize_t +set_persist(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct usb_device *udev = to_usb_device(dev); + int value; + + /* Hubs are always enabled for USB_PERSIST */ + if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) + return -EPERM; + + if (sscanf(buf, "%d", &value) != 1) + return -EINVAL; + usb_pm_lock(udev); + udev->persist_enabled = !!value; + usb_pm_unlock(udev); + return count; +} + +static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_persist); + +static int add_persist_attributes(struct device *dev) +{ + int rc = 0; + + if (is_usb_device(dev)) { + struct usb_device *udev = to_usb_device(dev); + + /* Hubs are automatically enabled for USB_PERSIST */ + if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) + udev->persist_enabled = 1; + rc = sysfs_add_file_to_group(&dev->kobj, + &dev_attr_persist.attr, + power_group); + } + return rc; +} + +static void remove_persist_attributes(struct device *dev) +{ + sysfs_remove_file_from_group(&dev->kobj, + &dev_attr_persist.attr, + power_group); +} + +#else + +#define add_persist_attributes(dev) 0 +#define remove_persist_attributes(dev) do {} while (0) + +#endif /* CONFIG_USB_PERSIST */ + #ifdef CONFIG_USB_SUSPEND static ssize_t @@ -276,8 +343,6 @@ set_level(struct device *dev, struct device_attribute *attr, static DEVICE_ATTR(level, S_IRUGO | S_IWUSR, show_level, set_level); -static char power_group[] = "power"; - static int add_power_attributes(struct device *dev) { int rc = 0; @@ -311,6 +376,7 @@ static void remove_power_attributes(struct device *dev) #endif /* CONFIG_USB_SUSPEND */ + /* Descriptor fields */ #define usb_descriptor_attr_le16(field, format_string) \ static ssize_t \ @@ -384,6 +450,10 @@ int usb_create_sysfs_dev_files(struct usb_device *udev) if (retval) return retval; + retval = add_persist_attributes(dev); + if (retval) + goto error; + retval = add_power_attributes(dev); if (retval) goto error; @@ -421,9 +491,29 @@ void usb_remove_sysfs_dev_files(struct usb_device *udev) device_remove_file(dev, &dev_attr_product); device_remove_file(dev, &dev_attr_serial); remove_power_attributes(dev); + remove_persist_attributes(dev); sysfs_remove_group(&dev->kobj, &dev_attr_grp); } +/* Interface Accociation Descriptor fields */ +#define usb_intf_assoc_attr(field, format_string) \ +static ssize_t \ +show_iad_##field (struct device *dev, struct device_attribute *attr, \ + char *buf) \ +{ \ + struct usb_interface *intf = to_usb_interface (dev); \ + \ + return sprintf (buf, format_string, \ + intf->intf_assoc->field); \ +} \ +static DEVICE_ATTR(iad_##field, S_IRUGO, show_iad_##field, NULL); + +usb_intf_assoc_attr (bFirstInterface, "%02x\n") +usb_intf_assoc_attr (bInterfaceCount, "%02d\n") +usb_intf_assoc_attr (bFunctionClass, "%02x\n") +usb_intf_assoc_attr (bFunctionSubClass, "%02x\n") +usb_intf_assoc_attr (bFunctionProtocol, "%02x\n") + /* Interface fields */ #define usb_intf_attr(field, format_string) \ static ssize_t \ @@ -487,6 +577,18 @@ static ssize_t show_modalias(struct device *dev, } static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, NULL); +static struct attribute *intf_assoc_attrs[] = { + &dev_attr_iad_bFirstInterface.attr, + &dev_attr_iad_bInterfaceCount.attr, + &dev_attr_iad_bFunctionClass.attr, + &dev_attr_iad_bFunctionSubClass.attr, + &dev_attr_iad_bFunctionProtocol.attr, + NULL, +}; +static struct attribute_group intf_assoc_attr_grp = { + .attrs = intf_assoc_attrs, +}; + static struct attribute *intf_attrs[] = { &dev_attr_bInterfaceNumber.attr, &dev_attr_bAlternateSetting.attr, @@ -538,6 +640,8 @@ int usb_create_sysfs_intf_files(struct usb_interface *intf) alt->string = usb_cache_string(udev, alt->desc.iInterface); if (alt->string) retval = device_create_file(dev, &dev_attr_interface); + if (intf->intf_assoc) + retval = sysfs_create_group(&dev->kobj, &intf_assoc_attr_grp); usb_create_intf_ep_files(intf, udev); return 0; } @@ -549,4 +653,5 @@ void usb_remove_sysfs_intf_files(struct usb_interface *intf) usb_remove_intf_ep_files(intf); device_remove_file(dev, &dev_attr_interface); sysfs_remove_group(&dev->kobj, &intf_attr_grp); + sysfs_remove_group(&intf->dev.kobj, &intf_assoc_attr_grp); } diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c index 94ea9727ff55..52ec44b828f3 100644 --- a/drivers/usb/core/urb.c +++ b/drivers/usb/core/urb.c @@ -4,6 +4,7 @@ #include <linux/slab.h> #include <linux/init.h> #include <linux/usb.h> +#include <linux/wait.h> #include "hcd.h" #define to_urb(d) container_of(d, struct urb, kref) @@ -11,6 +12,10 @@ static void urb_destroy(struct kref *kref) { struct urb *urb = to_urb(kref); + + if (urb->transfer_flags & URB_FREE_BUFFER) + kfree(urb->transfer_buffer); + kfree(urb); } @@ -34,6 +39,7 @@ void usb_init_urb(struct urb *urb) memset(urb, 0, sizeof(*urb)); kref_init(&urb->kref); spin_lock_init(&urb->lock); + INIT_LIST_HEAD(&urb->anchor_list); } } @@ -100,8 +106,60 @@ struct urb * usb_get_urb(struct urb *urb) kref_get(&urb->kref); return urb; } - - + +/** + * usb_anchor_urb - anchors an URB while it is processed + * @urb: pointer to the urb to anchor + * @anchor: pointer to the anchor + * + * This can be called to have access to URBs which are to be executed + * without bothering to track them + */ +void usb_anchor_urb(struct urb *urb, struct usb_anchor *anchor) +{ + unsigned long flags; + + spin_lock_irqsave(&anchor->lock, flags); + usb_get_urb(urb); + list_add_tail(&urb->anchor_list, &anchor->urb_list); + urb->anchor = anchor; + spin_unlock_irqrestore(&anchor->lock, flags); +} +EXPORT_SYMBOL_GPL(usb_anchor_urb); + +/** + * usb_unanchor_urb - unanchors an URB + * @urb: pointer to the urb to anchor + * + * Call this to stop the system keeping track of this URB + */ +void usb_unanchor_urb(struct urb *urb) +{ + unsigned long flags; + struct usb_anchor *anchor; + + if (!urb) + return; + + anchor = urb->anchor; + if (!anchor) + return; + + spin_lock_irqsave(&anchor->lock, flags); + if (unlikely(anchor != urb->anchor)) { + /* we've lost the race to another thread */ + spin_unlock_irqrestore(&anchor->lock, flags); + return; + } + urb->anchor = NULL; + list_del(&urb->anchor_list); + spin_unlock_irqrestore(&anchor->lock, flags); + usb_put_urb(urb); + if (list_empty(&anchor->urb_list)) + wake_up(&anchor->wait); +} +EXPORT_SYMBOL_GPL(usb_unanchor_urb); + /*-------------------------------------------------------------------*/ /** @@ -478,6 +536,48 @@ void usb_kill_urb(struct urb *urb) spin_unlock_irq(&urb->lock); } +/** + * usb_kill_anchored_urbs - cancel transfer requests en masse + * @anchor: anchor the requests are bound to + * + * this allows all outstanding URBs to be killed starting + * from the back of the queue + */ +void usb_kill_anchored_urbs(struct usb_anchor *anchor) +{ + struct urb *victim; + + spin_lock_irq(&anchor->lock); + while (!list_empty(&anchor->urb_list)) { + victim = list_entry(anchor->urb_list.prev, struct urb, anchor_list); + /* we must make sure the URB isn't freed before we kill it*/ + usb_get_urb(victim); + spin_unlock_irq(&anchor->lock); + /* this will unanchor the URB */ + usb_kill_urb(victim); + usb_put_urb(victim); + spin_lock_irq(&anchor->lock); + } + spin_unlock_irq(&anchor->lock); +} +EXPORT_SYMBOL_GPL(usb_kill_anchored_urbs); + +/** + * usb_wait_anchor_empty_timeout - wait for an anchor to be unused + * @anchor: the anchor you want to become unused + * @timeout: how long you are willing to wait in milliseconds + * + * Call this is you want to be sure all an anchor's + * URBs have finished + */ +int usb_wait_anchor_empty_timeout(struct usb_anchor *anchor, + unsigned int timeout) +{ + return wait_event_timeout(anchor->wait, list_empty(&anchor->urb_list), + msecs_to_jiffies(timeout)); +} +EXPORT_SYMBOL_GPL(usb_wait_anchor_empty_timeout); + EXPORT_SYMBOL(usb_init_urb); EXPORT_SYMBOL(usb_alloc_urb); EXPORT_SYMBOL(usb_free_urb); @@ -485,4 +585,3 @@ EXPORT_SYMBOL(usb_get_urb); EXPORT_SYMBOL(usb_submit_urb); EXPORT_SYMBOL(usb_unlink_urb); EXPORT_SYMBOL(usb_kill_urb); - diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index 4a6299bd0047..0fee5c66fd64 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -253,6 +253,7 @@ usb_alloc_dev(struct usb_device *parent, struct usb_bus *bus, unsigned port1) dev->dev.bus = &usb_bus_type; dev->dev.type = &usb_device_type; dev->dev.dma_mask = bus->controller->dma_mask; + set_dev_node(&dev->dev, dev_to_node(bus->controller)); dev->state = USB_STATE_ATTACHED; INIT_LIST_HEAD(&dev->ep0.urb_list); @@ -578,11 +579,12 @@ int __usb_get_extra_descriptor(char *buffer, unsigned size, * address (through the pointer provided). * * These buffers are used with URB_NO_xxx_DMA_MAP set in urb->transfer_flags - * to avoid behaviors like using "DMA bounce buffers", or tying down I/O - * mapping hardware for long idle periods. The implementation varies between + * to avoid behaviors like using "DMA bounce buffers", or thrashing IOMMU + * hardware during URB completion/resubmit. The implementation varies between * platforms, depending on details of how DMA will work to this device. - * Using these buffers also helps prevent cacheline sharing problems on - * architectures where CPU caches are not DMA-coherent. + * Using these buffers also eliminates cacheline sharing problems on + * architectures where CPU caches are not DMA-coherent. On systems without + * bus-snooping caches, these buffers are uncached. * * When the buffer is no longer used, free it with usb_buffer_free(). */ @@ -607,7 +609,7 @@ void *usb_buffer_alloc( * * This reclaims an I/O buffer, letting it be reused. The memory must have * been allocated using usb_buffer_alloc(), and the parameters must match - * those provided in that allocation request. + * those provided in that allocation request. */ void usb_buffer_free( struct usb_device *dev, diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h index bf2eb0dae2ec..ad5fa0338f49 100644 --- a/drivers/usb/core/usb.h +++ b/drivers/usb/core/usb.h @@ -52,8 +52,16 @@ static inline void usb_pm_unlock(struct usb_device *udev) #else -#define usb_port_suspend(dev) 0 -#define usb_port_resume(dev) 0 +static inline int usb_port_suspend(struct usb_device *udev) +{ + return 0; +} + +static inline int usb_port_resume(struct usb_device *udev) +{ + return 0; +} + static inline void usb_pm_lock(struct usb_device *udev) {} static inline void usb_pm_unlock(struct usb_device *udev) {} @@ -100,11 +108,13 @@ static inline int is_usb_device_driver(struct device_driver *drv) static inline void mark_active(struct usb_interface *f) { f->is_active = 1; + f->dev.power.power_state.event = PM_EVENT_ON; } static inline void mark_quiesced(struct usb_interface *f) { f->is_active = 0; + f->dev.power.power_state.event = PM_EVENT_SUSPEND; } static inline int is_active(const struct usb_interface *f) |