hub.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:28k
- /*
- * 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 <linux/config.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/completion.h>
- #include <linux/sched.h>
- #include <linux/list.h>
- #include <linux/slab.h>
- #include <linux/smp_lock.h>
- #ifdef CONFIG_USB_DEBUG
- #define DEBUG
- #else
- #undef DEBUG
- #endif
- #include <linux/usb.h>
- #include <linux/usbdevice_fs.h>
- #include <asm/semaphore.h>
- #include <asm/uaccess.h>
- #include <asm/byteorder.h>
- #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 int 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));
- /* <hub->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;
- }
- hub->children[port] = dev;
- /* 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))
- 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;
- }
- hub->children[port] = NULL;
- 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)
- {
- int 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)
- 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;
- }