/* * USB hub driver. * * (C) Copyright 1999 Linus Torvalds * (C) Copyright 1999 Johannes Erdfelt * (C) Copyright 1999 Gregory P. Smith * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au) * */ #include #include #include #include #include #include #include #include #ifdef CONFIG_USB_DEBUG #define DEBUG #else #undef DEBUG #endif #include #include #include #include #include #include "hub.h" /* Wakes up khubd */ static spinlock_t hub_event_lock = SPIN_LOCK_UNLOCKED; static DECLARE_MUTEX(usb_address0_sem); static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */ static LIST_HEAD(hub_list); /* List containing all of the hubs (for cleanup) */ static DECLARE_WAIT_QUEUE_HEAD(khubd_wait); static pid_t khubd_pid = 0; /* PID of khubd */ static DECLARE_COMPLETION(khubd_exited); #ifdef DEBUG static inline char *portspeed (int portstatus) { if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED)) return "480 Mb/s"; else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED)) return "1.5 Mb/s"; else return "12 Mb/s"; } #endif /* USB 2.0 spec Section 11.24.4.5 */ static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size) { return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB, USB_DT_HUB << 8, 0, data, size, HZ); } /* * USB 2.0 spec Section 11.24.2.1 */ static int usb_clear_hub_feature(struct usb_device *dev, int feature) { return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, HZ); } /* * USB 2.0 spec Section 11.24.2.2 * BUG: doesn't handle port indicator selector in high byte of wIndex */ static int usb_clear_port_feature(struct usb_device *dev, int port, int feature) { return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port, NULL, 0, HZ); } /* * USB 2.0 spec Section 11.24.2.13 * BUG: doesn't handle port indicator selector in high byte of wIndex */ static int usb_set_port_feature(struct usb_device *dev, int port, int feature) { return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port, NULL, 0, HZ); } /* * USB 2.0 spec Section 11.24.2.6 */ static int usb_get_hub_status(struct usb_device *dev, void *data) { return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0, data, sizeof(struct usb_hub_status), HZ); } /* * USB 2.0 spec Section 11.24.2.7 */ static int usb_get_port_status(struct usb_device *dev, int port, void *data) { return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port, data, sizeof(struct usb_hub_status), HZ); } static void hub_irq(struct urb *urb) { struct usb_hub *hub = (struct usb_hub *)urb->context; unsigned long flags; /* Cause a hub reset after 10 consecutive errors */ if (urb->status) { if (urb->status == -ENOENT) return; dbg("nonzero status in irq %d", urb->status); if ((++hub->nerrors < 10) || hub->error) return; hub->error = urb->status; } hub->nerrors = 0; /* Something happened, let khubd figure it out */ spin_lock_irqsave(&hub_event_lock, flags); if (list_empty(&hub->event_list)) { list_add(&hub->event_list, &hub_event_list); wake_up(&khubd_wait); } spin_unlock_irqrestore(&hub_event_lock, flags); } static void usb_hub_power_on(struct usb_hub *hub) { int i; /* Enable power to the ports */ dbg("enabling power on all ports"); for (i = 0; i < hub->descriptor->bNbrPorts; i++) usb_set_port_feature(hub->dev, i + 1, USB_PORT_FEAT_POWER); /* Wait for power to be enabled */ wait_ms(hub->descriptor->bPwrOn2PwrGood * 2); } static int usb_hub_configure(struct usb_hub *hub, struct usb_endpoint_descriptor *endpoint) { struct usb_device *dev = hub->dev; struct usb_hub_status *hubstatus; char portstr[USB_MAXCHILDREN + 1]; unsigned int pipe; int i, maxp, ret; hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL); if (!hub->descriptor) { err("Unable to kmalloc %Zd bytes for hub descriptor", sizeof(*hub->descriptor)); return -1; } /* Request the entire hub descriptor. */ ret = usb_get_hub_descriptor(dev, hub->descriptor, sizeof(*hub->descriptor)); /* descriptor> is large enough for a hub with 127 ports; * the hub can/will return fewer bytes here. */ if (ret < 0) { err("Unable to get hub descriptor (err = %d)", ret); kfree(hub->descriptor); return -1; } dev->maxchild = hub->descriptor->bNbrPorts; info("%d port%s detected", hub->descriptor->bNbrPorts, (hub->descriptor->bNbrPorts == 1) ? "" : "s"); le16_to_cpus(&hub->descriptor->wHubCharacteristics); if (hub->descriptor->wHubCharacteristics & HUB_CHAR_COMPOUND) dbg("part of a compound device"); else dbg("standalone hub"); switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_LPSM) { case 0x00: dbg("ganged power switching"); break; case 0x01: dbg("individual port power switching"); break; case 0x02: case 0x03: dbg("unknown reserved power switching mode"); break; } switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_OCPM) { case 0x00: dbg("global over-current protection"); break; case 0x08: dbg("individual port over-current protection"); break; case 0x10: case 0x18: dbg("no over-current protection"); break; } switch (dev->descriptor.bDeviceProtocol) { case 0: break; case 1: dbg("Single TT"); hub->tt.hub = dev; break; case 2: dbg("TT per port"); hub->tt.hub = dev; hub->tt.multi = 1; break; default: dbg("Unrecognized hub protocol %d", dev->descriptor.bDeviceProtocol); break; } switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_TTTT) { case 0x00: if (dev->descriptor.bDeviceProtocol != 0) dbg("TT requires at most 8 FS bit times"); break; case 0x20: dbg("TT requires at most 16 FS bit times"); break; case 0x40: dbg("TT requires at most 24 FS bit times"); break; case 0x60: dbg("TT requires at most 32 FS bit times"); break; } dbg("Port indicators are %s supported", (hub->descriptor->wHubCharacteristics & HUB_CHAR_PORTIND) ? "" : "not"); dbg("power on to power good time: %dms", hub->descriptor->bPwrOn2PwrGood * 2); dbg("hub controller current requirement: %dmA", hub->descriptor->bHubContrCurrent); for (i = 0; i < dev->maxchild; i++) portstr[i] = hub->descriptor->DeviceRemovable[((i + 1) / 8)] & (1 << ((i + 1) % 8)) ? 'F' : 'R'; portstr[dev->maxchild] = 0; dbg("port removable status: %s", portstr); hubstatus = kmalloc(sizeof *hubstatus, GFP_KERNEL); if (!hubstatus) { err("Unable to allocate hubstatus"); kfree(hub->descriptor); return -1; } ret = usb_get_hub_status(dev, hubstatus); if (ret < 0) { err("Unable to get hub status (err = %d)", ret); kfree(hubstatus); kfree(hub->descriptor); return -1; } le16_to_cpus(&hubstatus->wHubStatus); dbg("local power source is %s", (hubstatus->wHubStatus & HUB_STATUS_LOCAL_POWER) ? "lost (inactive)" : "good"); dbg("%sover-current condition exists", (hubstatus->wHubStatus & HUB_STATUS_OVERCURRENT) ? "" : "no "); kfree(hubstatus); /* Start the interrupt endpoint */ pipe = usb_rcvintpipe(dev, endpoint->bEndpointAddress); maxp = usb_maxpacket(dev, pipe, usb_pipeout(pipe)); if (maxp > sizeof(hub->buffer)) maxp = sizeof(hub->buffer); hub->urb = usb_alloc_urb(0); if (!hub->urb) { err("couldn't allocate interrupt urb"); kfree(hub->descriptor); return -1; } FILL_INT_URB(hub->urb, dev, pipe, hub->buffer, maxp, hub_irq, hub, /* NOTE: in 2.5 fill_int_urb() converts the encoding */ (dev->speed == USB_SPEED_HIGH) ? 1 << (endpoint->bInterval - 1) : endpoint->bInterval); ret = usb_submit_urb(hub->urb); if (ret) { err("usb_submit_urb failed (%d)", ret); kfree(hub->descriptor); return -1; } /* Wake up khubd */ wake_up(&khubd_wait); usb_hub_power_on(hub); return 0; } static void *hub_probe(struct usb_device *dev, unsigned int i, const struct usb_device_id *id) { struct usb_interface_descriptor *interface; struct usb_endpoint_descriptor *endpoint; struct usb_hub *hub; unsigned long flags; interface = &dev->actconfig->interface[i].altsetting[0]; /* Some hubs have a subclass of 1, which AFAICT according to the */ /* specs is not defined, but it works */ if ((interface->bInterfaceSubClass != 0) && (interface->bInterfaceSubClass != 1)) { err("invalid subclass (%d) for USB hub device #%d", interface->bInterfaceSubClass, dev->devnum); return NULL; } /* Multiple endpoints? What kind of mutant ninja-hub is this? */ if (interface->bNumEndpoints != 1) { err("invalid bNumEndpoints (%d) for USB hub device #%d", interface->bNumEndpoints, dev->devnum); return NULL; } endpoint = &interface->endpoint[0]; /* Output endpoint? Curiousier and curiousier.. */ if (!(endpoint->bEndpointAddress & USB_DIR_IN)) { err("Device #%d is hub class, but has output endpoint?", dev->devnum); return NULL; } /* If it's not an interrupt endpoint, we'd better punt! */ if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_INT) { err("Device #%d is hub class, but has endpoint other than interrupt?", dev->devnum); return NULL; } /* We found a hub */ info("USB hub found"); hub = kmalloc(sizeof(*hub), GFP_KERNEL); if (!hub) { err("couldn't kmalloc hub struct"); return NULL; } memset(hub, 0, sizeof(*hub)); INIT_LIST_HEAD(&hub->event_list); hub->dev = dev; init_MUTEX(&hub->khubd_sem); /* Record the new hub's existence */ spin_lock_irqsave(&hub_event_lock, flags); INIT_LIST_HEAD(&hub->hub_list); list_add(&hub->hub_list, &hub_list); spin_unlock_irqrestore(&hub_event_lock, flags); if (usb_hub_configure(hub, endpoint) >= 0) return hub; err("hub configuration failed for device #%d", dev->devnum); /* free hub, but first clean up its list. */ spin_lock_irqsave(&hub_event_lock, flags); /* Delete it and then reset it */ list_del(&hub->event_list); INIT_LIST_HEAD(&hub->event_list); list_del(&hub->hub_list); INIT_LIST_HEAD(&hub->hub_list); spin_unlock_irqrestore(&hub_event_lock, flags); kfree(hub); return NULL; } static void hub_disconnect(struct usb_device *dev, void *ptr) { struct usb_hub *hub = (struct usb_hub *)ptr; unsigned long flags; spin_lock_irqsave(&hub_event_lock, flags); /* Delete it and then reset it */ list_del(&hub->event_list); INIT_LIST_HEAD(&hub->event_list); list_del(&hub->hub_list); INIT_LIST_HEAD(&hub->hub_list); spin_unlock_irqrestore(&hub_event_lock, flags); down(&hub->khubd_sem); /* Wait for khubd to leave this hub alone. */ up(&hub->khubd_sem); if (hub->urb) { usb_unlink_urb(hub->urb); usb_free_urb(hub->urb); hub->urb = NULL; } if (hub->descriptor) { kfree(hub->descriptor); hub->descriptor = NULL; } /* Free the memory */ kfree(hub); } static int hub_ioctl(struct usb_device *hub, unsigned int code, void *user_data) { /* assert ifno == 0 (part of hub spec) */ switch (code) { case USBDEVFS_HUB_PORTINFO: { struct usbdevfs_hub_portinfo *info = user_data; unsigned long flags; int i; spin_lock_irqsave(&hub_event_lock, flags); if (hub->devnum <= 0) info->nports = 0; else { info->nports = hub->maxchild; for (i = 0; i < info->nports; i++) { if (hub->children[i] == NULL) info->port[i] = 0; else info->port[i] = hub->children[i]->devnum; } } spin_unlock_irqrestore(&hub_event_lock, flags); return info->nports + 1; } default: return -ENOSYS; } } static int usb_hub_reset(struct usb_hub *hub) { struct usb_device *dev = hub->dev; int i; /* Disconnect any attached devices */ for (i = 0; i < hub->descriptor->bNbrPorts; i++) { if (dev->children[i]) usb_disconnect(&dev->children[i]); } /* Attempt to reset the hub */ if (hub->urb) usb_unlink_urb(hub->urb); else return -1; if (usb_reset_device(dev)) return -1; hub->urb->dev = dev; if (usb_submit_urb(hub->urb)) return -1; usb_hub_power_on(hub); return 0; } static void usb_hub_disconnect(struct usb_device *dev) { struct usb_device *parent = dev->parent; int i; /* Find the device pointer to disconnect */ if (parent) { for (i = 0; i < parent->maxchild; i++) { if (parent->children[i] == dev) { usb_disconnect(&parent->children[i]); return; } } } err("cannot disconnect hub %d", dev->devnum); } static int usb_hub_port_status(struct usb_device *hub, int port, u16 *status, u16 *change) { struct usb_port_status *portsts; int ret = -ENOMEM; portsts = kmalloc(sizeof(*portsts), GFP_KERNEL); if (portsts) { ret = usb_get_port_status(hub, port + 1, portsts); if (ret < 0) err("%s (%d) failed (err = %d)", __FUNCTION__, hub->devnum, ret); else { *status = le16_to_cpu(portsts->wPortStatus); *change = le16_to_cpu(portsts->wPortChange); dbg("port %d, portstatus %x, change %x, %s", port + 1, *status, *change, portspeed(*status)); ret = 0; } kfree(portsts); } return ret; } #define HUB_RESET_TRIES 5 #define HUB_PROBE_TRIES 2 #define HUB_SHORT_RESET_TIME 10 #define HUB_LONG_RESET_TIME 200 #define HUB_RESET_TIMEOUT 500 /* return: -1 on error, 0 on success, 1 on disconnect. */ static int usb_hub_port_wait_reset(struct usb_device *hub, int port, struct usb_device *dev, unsigned int delay) { int delay_time, ret; u16 portstatus; u16 portchange; for (delay_time = 0; delay_time < HUB_RESET_TIMEOUT; delay_time += delay) { /* wait to give the device a chance to reset */ wait_ms(delay); /* read and decode port status */ ret = usb_hub_port_status(hub, port, &portstatus, &portchange); if (ret < 0) { return -1; } /* Device went away? */ if (!(portstatus & USB_PORT_STAT_CONNECTION)) return 1; /* bomb out completely if something weird happened */ if ((portchange & USB_PORT_STAT_C_CONNECTION)) return -1; /* if we`ve finished resetting, then break out of the loop */ if (!(portstatus & USB_PORT_STAT_RESET) && (portstatus & USB_PORT_STAT_ENABLE)) { if (portstatus & USB_PORT_STAT_HIGH_SPEED) dev->speed = USB_SPEED_HIGH; else if (portstatus & USB_PORT_STAT_LOW_SPEED) dev->speed = USB_SPEED_LOW; else dev->speed = USB_SPEED_FULL; return 0; } /* switch to the long delay after two short delay failures */ if (delay_time >= 2 * HUB_SHORT_RESET_TIME) delay = HUB_LONG_RESET_TIME; dbg("port %d of hub %d not reset yet, waiting %dms", port + 1, hub->devnum, delay); } return -1; } /* return: -1 on error, 0 on success, 1 on disconnect. */ static int usb_hub_port_reset(struct usb_device *hub, int port, struct usb_device *dev, unsigned int delay) { int i, status; /* Reset the port */ for (i = 0; i < HUB_RESET_TRIES; i++) { usb_set_port_feature(hub, port + 1, USB_PORT_FEAT_RESET); /* return on disconnect or reset */ status = usb_hub_port_wait_reset(hub, port, dev, delay); if (status != -1) { usb_clear_port_feature(hub, port + 1, USB_PORT_FEAT_C_RESET); return status; } dbg("port %d of hub %d not enabled, trying reset again...", port + 1, hub->devnum); delay = HUB_LONG_RESET_TIME; } err("Cannot enable port %i of hub %d, disabling port.", port + 1, hub->devnum); err("Maybe the USB cable is bad?"); return -1; } void usb_hub_port_disable(struct usb_device *hub, int port) { int ret; ret = usb_clear_port_feature(hub, port + 1, USB_PORT_FEAT_ENABLE); if (ret) err("cannot disable port %d of hub %d (err = %d)", port + 1, hub->devnum, ret); } /* USB 2.0 spec, 7.1.7.3 / fig 7-29: * * Between connect detection and reset signaling there must be a delay * of 100ms at least for debounce and power-settling. The corresponding * timer shall restart whenever the downstream port detects a disconnect. * * Apparently there are some bluetooth and irda-dongles and a number * of low-speed devices which require longer delays of about 200-400ms. * Not covered by the spec - but easy to deal with. * * This implementation uses 400ms minimum debounce timeout and checks * every 100ms for transient disconnects to restart the delay. */ #define HUB_DEBOUNCE_TIMEOUT 400 #define HUB_DEBOUNCE_STEP 100 /* return: -1 on error, 0 on success, 1 on disconnect. */ static int usb_hub_port_debounce(struct usb_device *hub, int port) { int ret; unsigned delay_time; u16 portchange, portstatus; for (delay_time = 0; delay_time < HUB_DEBOUNCE_TIMEOUT; /* empty */ ) { /* wait debounce step increment */ wait_ms(HUB_DEBOUNCE_STEP); ret = usb_hub_port_status(hub, port, &portstatus, &portchange); if (ret < 0) return -1; if ((portchange & USB_PORT_STAT_C_CONNECTION)) { usb_clear_port_feature(hub, port+1, USB_PORT_FEAT_C_CONNECTION); delay_time = 0; } else delay_time += HUB_DEBOUNCE_STEP; } return ((portstatus&USB_PORT_STAT_CONNECTION)) ? 0 : 1; } static void usb_hub_port_connect_change(struct usb_hub *hubstate, int port, u16 portstatus, u16 portchange) { struct usb_device *hub = hubstate->dev; struct usb_device *dev; unsigned int delay = HUB_SHORT_RESET_TIME; int i; dbg("port %d, portstatus %x, change %x, %s", port + 1, portstatus, portchange, portspeed (portstatus)); /* Clear the connection change status */ usb_clear_port_feature(hub, port + 1, USB_PORT_FEAT_C_CONNECTION); /* Disconnect any existing devices under this port */ if (hub->children[port]) usb_disconnect(&hub->children[port]); /* Return now if nothing is connected */ if (!(portstatus & USB_PORT_STAT_CONNECTION)) { if (portstatus & USB_PORT_STAT_ENABLE) usb_hub_port_disable(hub, port); return; } if (usb_hub_port_debounce(hub, port)) { err("connect-debounce failed, port %d disabled", port+1); usb_hub_port_disable(hub, port); return; } down(&usb_address0_sem); for (i = 0; i < HUB_PROBE_TRIES; i++) { struct usb_device *pdev; int len; /* Allocate a new device struct */ dev = usb_alloc_dev(hub, hub->bus); if (!dev) { err("couldn't allocate usb_device"); break; } /* Reset the device */ if (usb_hub_port_reset(hub, port, dev, delay)) { usb_free_dev(dev); break; } /* Find a new device ID for it */ usb_connect(dev); /* Set up TT records, if needed */ if (hub->tt) { dev->tt = hub->tt; dev->ttport = hub->ttport; } else if (dev->speed != USB_SPEED_HIGH && hub->speed == USB_SPEED_HIGH) { dev->tt = &hubstate->tt; dev->ttport = port + 1; } /* Save readable and stable topology id, distinguishing * devices by location for diagnostics, tools, etc. The * string is a path along hub ports, from the root. Each * device's id will be stable until USB is re-cabled, and * hubs are often labeled with these port numbers. * * Initial size: ".NN" times five hubs + NUL = 16 bytes max * (quite rare, since most hubs have 4-6 ports). */ pdev = dev->parent; if (pdev->devpath [0] != '0') /* parent not root? */ len = snprintf (dev->devpath, sizeof dev->devpath, "%s.%d", pdev->devpath, port + 1); /* root == "0", root port 2 == "2", port 3 that hub "2.3" */ else len = snprintf (dev->devpath, sizeof dev->devpath, "%d", port + 1); if (len == sizeof dev->devpath) warn ("devpath size! usb/%03d/%03d path %s", dev->bus->busnum, dev->devnum, dev->devpath); info("new USB device %s-%s, assigned address %d", dev->bus->bus_name, dev->devpath, dev->devnum); /* Run it through the hoops (find a driver, etc) */ if (!usb_new_device(dev)) { hub->children[port] = dev; goto done; } /* Free the configuration if there was an error */ usb_free_dev(dev); /* Switch to a long reset time */ delay = HUB_LONG_RESET_TIME; } usb_hub_port_disable(hub, port); done: up(&usb_address0_sem); } static void usb_hub_events(void) { unsigned long flags; struct list_head *tmp; struct usb_device *dev; struct usb_hub *hub; struct usb_hub_status *hubsts; u16 hubstatus; u16 hubchange; u16 portstatus; u16 portchange; int i, ret; /* * We restart the list everytime to avoid a deadlock with * deleting hubs downstream from this one. This should be * safe since we delete the hub from the event list. * Not the most efficient, but avoids deadlocks. */ while (1) { spin_lock_irqsave(&hub_event_lock, flags); if (list_empty(&hub_event_list)) break; /* Grab the next entry from the beginning of the list */ tmp = hub_event_list.next; hub = list_entry(tmp, struct usb_hub, event_list); dev = hub->dev; list_del(tmp); INIT_LIST_HEAD(tmp); down(&hub->khubd_sem); /* never blocks, we were on list */ spin_unlock_irqrestore(&hub_event_lock, flags); if (hub->error) { dbg("resetting hub %d for error %d", dev->devnum, hub->error); if (usb_hub_reset(hub)) { err("error resetting hub %d - disconnecting", dev->devnum); up(&hub->khubd_sem); usb_hub_disconnect(dev); continue; } hub->nerrors = 0; hub->error = 0; } for (i = 0; i < hub->descriptor->bNbrPorts; i++) { ret = usb_hub_port_status(dev, i, &portstatus, &portchange); if (ret < 0) { continue; } if (portchange & USB_PORT_STAT_C_CONNECTION) { dbg("port %d connection change", i + 1); usb_hub_port_connect_change(hub, i, portstatus, portchange); } else if (portchange & USB_PORT_STAT_C_ENABLE) { dbg("port %d enable change, status %x", i + 1, portstatus); usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_ENABLE); /* * EM interference sometimes causes bad shielded USB devices to * be shutdown by the hub, this hack enables them again. * Works at least with mouse driver. */ if (!(portstatus & USB_PORT_STAT_ENABLE) && (portstatus & USB_PORT_STAT_CONNECTION) && (dev->children[i])) { err("already running port %i disabled by hub (EMI?), re-enabling...", i + 1); usb_hub_port_connect_change(hub, i, portstatus, portchange); } } if (portchange & USB_PORT_STAT_C_SUSPEND) { dbg("port %d suspend change", i + 1); usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_SUSPEND); } if (portchange & USB_PORT_STAT_C_OVERCURRENT) { err("port %d over-current change", i + 1); usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_OVER_CURRENT); usb_hub_power_on(hub); } if (portchange & USB_PORT_STAT_C_RESET) { dbg("port %d reset change", i + 1); usb_clear_port_feature(dev, i + 1, USB_PORT_FEAT_C_RESET); } } /* end for i */ /* deal with hub status changes */ hubsts = kmalloc(sizeof *hubsts, GFP_KERNEL); if (!hubsts) { err("couldn't allocate hubsts"); } else { if (usb_get_hub_status(dev, hubsts) < 0) err("get_hub_status failed"); else { hubstatus = le16_to_cpup(&hubsts->wHubStatus); hubchange = le16_to_cpup(&hubsts->wHubChange); if (hubchange & HUB_CHANGE_LOCAL_POWER) { dbg("hub power change"); usb_clear_hub_feature(dev, C_HUB_LOCAL_POWER); } if (hubchange & HUB_CHANGE_OVERCURRENT) { dbg("hub overcurrent change"); wait_ms(500); /* Cool down */ usb_clear_hub_feature(dev, C_HUB_OVER_CURRENT); usb_hub_power_on(hub); } } kfree(hubsts); } up(&hub->khubd_sem); } /* end while (1) */ spin_unlock_irqrestore(&hub_event_lock, flags); } static int usb_hub_thread(void *__hub) { lock_kernel(); /* * This thread doesn't need any user-level access, * so get rid of all our resources */ daemonize(); reparent_to_init(); /* Setup a nice name */ strcpy(current->comm, "khubd"); /* Send me a signal to get me die (for debugging) */ do { usb_hub_events(); wait_event_interruptible(khubd_wait, !list_empty(&hub_event_list)); } while (!signal_pending(current)); dbg("usb_hub_thread exiting"); unlock_kernel(); complete_and_exit(&khubd_exited, 0); } static struct usb_device_id hub_id_table [] = { { match_flags: USB_DEVICE_ID_MATCH_INT_CLASS, bInterfaceClass: USB_CLASS_HUB}, { } /* Terminating entry */ }; MODULE_DEVICE_TABLE (usb, hub_id_table); static struct usb_driver hub_driver = { name: "hub", probe: hub_probe, ioctl: hub_ioctl, disconnect: hub_disconnect, id_table: hub_id_table, }; /* * This should be a separate module. */ int usb_hub_init(void) { pid_t pid; if (usb_register(&hub_driver) < 0) { err("Unable to register USB hub driver"); return -1; } pid = kernel_thread(usb_hub_thread, NULL, CLONE_FS | CLONE_FILES | CLONE_SIGHAND); if (pid >= 0) { khubd_pid = pid; return 0; } /* Fall through if kernel_thread failed */ usb_deregister(&hub_driver); err("failed to start usb_hub_thread"); return -1; } void usb_hub_cleanup(void) { int ret; /* Kill the thread */ ret = kill_proc(khubd_pid, SIGTERM, 1); wait_for_completion(&khubd_exited); /* * Hub resources are freed for us by usb_deregister. It calls * usb_driver_purge on every device which in turn calls that * devices disconnect function if it is using this driver. * The hub_disconnect function takes care of releasing the * individual hub resources. -greg */ usb_deregister(&hub_driver); } /* usb_hub_cleanup() */ /* * WARNING - If a driver calls usb_reset_device, you should simulate a * disconnect() and probe() for other interfaces you doesn't claim. This * is left up to the driver writer right now. This insures other drivers * have a chance to re-setup their interface. * * Take a look at proc_resetdevice in devio.c for some sample code to * do this. */ int usb_reset_device(struct usb_device *dev) { struct usb_device *parent = dev->parent; struct usb_device_descriptor *descriptor; int i, ret, port = -1; if (!parent) { err("attempting to reset root hub!"); return -EINVAL; } for (i = 0; i < parent->maxchild; i++) if (parent->children[i] == dev) { port = i; break; } if (port < 0) return -ENOENT; down(&usb_address0_sem); /* Send a reset to the device */ if (usb_hub_port_reset(parent, port, dev, HUB_SHORT_RESET_TIME)) { usb_hub_port_disable(parent, port); up(&usb_address0_sem); return(-ENODEV); } /* Reprogram the Address */ ret = usb_set_address(dev); if (ret < 0) { err("USB device not accepting new address (error=%d)", ret); usb_hub_port_disable(parent, port); up(&usb_address0_sem); return ret; } /* Let the SET_ADDRESS settle */ wait_ms(10); up(&usb_address0_sem); /* * Now we fetch the configuration descriptors for the device and * see if anything has changed. If it has, we dump the current * parsed descriptors and reparse from scratch. Then we leave * the device alone for the caller to finish setting up. * * If nothing changed, we reprogram the configuration and then * the alternate settings. */ descriptor = kmalloc(sizeof *descriptor, GFP_NOIO); if (!descriptor) { return -ENOMEM; } ret = usb_get_descriptor(dev, USB_DT_DEVICE, 0, descriptor, sizeof(*descriptor)); if (ret < 0) { kfree(descriptor); return ret; } le16_to_cpus(&descriptor->bcdUSB); le16_to_cpus(&descriptor->idVendor); le16_to_cpus(&descriptor->idProduct); le16_to_cpus(&descriptor->bcdDevice); if (memcmp(&dev->descriptor, descriptor, sizeof(*descriptor))) { kfree(descriptor); usb_destroy_configuration(dev); ret = usb_get_device_descriptor(dev); if (ret < sizeof(dev->descriptor)) { if (ret < 0) err("unable to get device descriptor (error=%d)", ret); else err("USB device descriptor short read (expected %Zi, got %i)", sizeof(dev->descriptor), ret); clear_bit(dev->devnum, &dev->bus->devmap.devicemap); dev->devnum = -1; return -EIO; } ret = usb_get_configuration(dev); if (ret < 0) { err("unable to get configuration (error=%d)", ret); usb_destroy_configuration(dev); clear_bit(dev->devnum, &dev->bus->devmap.devicemap); dev->devnum = -1; return 1; } dev->actconfig = dev->config; usb_set_maxpacket(dev); return 1; } kfree(descriptor); ret = usb_set_configuration(dev, dev->actconfig->bConfigurationValue); if (ret < 0) { err("failed to set active configuration (error=%d)", ret); return ret; } for (i = 0; i < dev->actconfig->bNumInterfaces; i++) { struct usb_interface *intf = &dev->actconfig->interface[i]; struct usb_interface_descriptor *as = &intf->altsetting[intf->act_altsetting]; ret = usb_set_interface(dev, as->bInterfaceNumber, as->bAlternateSetting); if (ret < 0) { err("failed to set active alternate setting for interface %d (error=%d)", i, ret); return ret; } } return 0; }