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/*
* 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");
break;
case 2:
dbg("Multiple TT");
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);
ret = usb_get_hub_status(dev, &hubstatus);
if (ret < 0) {
err("Unable to get hub status (err = %d)", ret);
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 ");
/* 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, 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);
}
#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;
struct usb_port_status portsts;
unsigned short portchange, portstatus;
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_get_port_status(hub, port + 1, &portsts);
if (ret < 0) {
err("get_port_status(%d) failed (err = %d)", port + 1, ret);
return -1;
}
portstatus = le16_to_cpu(portsts.wPortStatus);
portchange = le16_to_cpu(portsts.wPortChange);
dbg("port %d, portstatus %x, change %x, %s", port + 1,
portstatus, portchange, portspeed (portstatus));
/* 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);
}
static void usb_hub_port_connect_change(struct usb_device *hub, int port,
struct usb_port_status *portsts)
{
struct usb_device *dev;
unsigned short portstatus, portchange;
unsigned int delay = HUB_SHORT_RESET_TIME;
int i;
char *portstr, *tempstr;
portstatus = le16_to_cpu(portsts->wPortStatus);
portchange = le16_to_cpu(portsts->wPortChange);
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;
}
/* Some low speed devices have problems with the quick delay, so */
/* be a bit pessimistic with those devices. RHbug #23670 */
if (portstatus & USB_PORT_STAT_LOW_SPEED) {
wait_ms(400);
delay = HUB_LONG_RESET_TIME;
}
down(&usb_address0_sem);
tempstr = kmalloc(1024, GFP_KERNEL);
portstr = kmalloc(1024, GFP_KERNEL);
for (i = 0; i < HUB_PROBE_TRIES; i++) {
struct usb_device *pdev, *cdev;
/* 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);
/* Create a readable topology string */
cdev = dev;
pdev = dev->parent;
if (portstr && tempstr) {
portstr[0] = 0;
while (pdev) {
int port;
for (port = 0; port < pdev->maxchild; port++)
if (pdev->children[port] == cdev)
break;
strcpy(tempstr, portstr);
if (!strlen(tempstr))
sprintf(portstr, "%d", port + 1);
else
sprintf(portstr, "%d/%s", port + 1, tempstr);
cdev = pdev;
pdev = pdev->parent;
}
info("USB new device connect on bus%d/%s, assigned device number %d",
dev->bus->busnum, portstr, dev->devnum);
} else
info("USB new device connect on bus%d, assigned device number %d",
dev->bus->busnum, 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);
if (portstr)
kfree(portstr);
if (tempstr)
kfree(tempstr);
}
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;
unsigned short hubstatus, hubchange;
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++) {
struct usb_port_status portsts;
unsigned short portstatus, portchange;
ret = usb_get_port_status(dev, i + 1, &portsts);
if (ret < 0) {
err("get_port_status failed (err = %d)", ret);
continue;
}
portstatus = le16_to_cpu(portsts.wPortStatus);
portchange = le16_to_cpu(portsts.wPortChange);
if (portchange & USB_PORT_STAT_C_CONNECTION) {
dbg("port %d connection change", i + 1);
usb_hub_port_connect_change(dev, i, &portsts);
} 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(dev, i, &portsts);
}
}
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 */
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);
}
}
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();
/* Setup a nice name */
strcpy(current->comm, "khubd");
/* Send me a signal to get me die (for debugging) */
do {
usb_hub_events();
interruptible_sleep_on(&khubd_wait);
} 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.
*/
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))) {
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;
}
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;
}
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