/*
* 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/errno.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/completion.h>
#include <linux/sched.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/ioctl.h>
#ifdef CONFIG_USB_DEBUG
#define DEBUG
#else
#undef DEBUG
#endif
#include <linux/usb.h>
#include <linux/usbdevice_fs.h>
#include <linux/suspend.h>
#include <asm/semaphore.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>
#include "usb.h"
#include "hcd.h"
#include "hub.h"
/* Wakes up khubd */
static spinlock_t hub_event_lock = SPIN_LOCK_UNLOCKED;
static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
static LIST_HEAD(hub_list); /* List of all hubs (for cleanup) */
static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
static pid_t khubd_pid = 0; /* PID of khubd */
static DECLARE_COMPLETION(khubd_exited);
/* cycle leds on hubs that aren't blinking for attention */
static int blinkenlights = 0;
module_param (blinkenlights, bool, S_IRUGO);
MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
#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
/* for dev_info, dev_dbg, etc */
static inline struct device *hubdev (struct usb_device *hdev)
{
return &hdev->actconfig->interface[0]->dev;
}
/* USB 2.0 spec Section 11.24.4.5 */
static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
{
return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
USB_DT_HUB << 8, 0, data, size, HZ * USB_CTRL_GET_TIMEOUT);
}
/*
* USB 2.0 spec Section 11.24.2.1
*/
static int clear_hub_feature(struct usb_device *hdev, int feature)
{
return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, HZ);
}
/*
* USB 2.0 spec Section 11.24.2.2
*/
static int clear_port_feature(struct usb_device *hdev, int port, int feature)
{
return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port, NULL, 0, HZ);
}
/*
* USB 2.0 spec Section 11.24.2.13
*/
static int set_port_feature(struct usb_device *hdev, int port, int feature)
{
return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port, NULL, 0, HZ);
}
/*
* USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
* for info about using port indicators
*/
static void set_port_led(
struct usb_device *hdev,
int port,
int selector
)
{
int status = set_port_feature(hdev, (selector << 8) | port,
USB_PORT_FEAT_INDICATOR);
if (status < 0)
dev_dbg (hubdev (hdev),
"port %d indicator %s status %d\n",
port,
({ char *s; switch (selector) {
case HUB_LED_AMBER: s = "amber"; break;
case HUB_LED_GREEN: s = "green"; break;
case HUB_LED_OFF: s = "off"; break;
case HUB_LED_AUTO: s = "auto"; break;
default: s = "??"; break;
}; s; }),
status);
}
#define LED_CYCLE_PERIOD ((2*HZ)/3)
static void led_work (void *__hub)
{
struct usb_hub *hub = __hub;
struct usb_device *hdev = interface_to_usbdev (hub->intf);
unsigned i;
unsigned changed = 0;
int cursor = -1;
if (hdev->state != USB_STATE_CONFIGURED)
return;
for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
unsigned selector, mode;
/* 30%-50% duty cycle */
switch (hub->indicator[i]) {
/* cycle marker */
case INDICATOR_CYCLE:
cursor = i;
selector = HUB_LED_AUTO;
mode = INDICATOR_AUTO;
break;
/* blinking green = sw attention */
case INDICATOR_GREEN_BLINK:
selector = HUB_LED_GREEN;
mode = INDICATOR_GREEN_BLINK_OFF;
break;
case INDICATOR_GREEN_BLINK_OFF:
selector = HUB_LED_OFF;
mode = INDICATOR_GREEN_BLINK;
break;
/* blinking amber = hw attention */
case INDICATOR_AMBER_BLINK:
selector = HUB_LED_AMBER;
mode = INDICATOR_AMBER_BLINK_OFF;
break;
case INDICATOR_AMBER_BLINK_OFF:
selector = HUB_LED_OFF;
mode = INDICATOR_AMBER_BLINK;
break;
/* blink green/amber = reserved */
case INDICATOR_ALT_BLINK:
selector = HUB_LED_GREEN;
mode = INDICATOR_ALT_BLINK_OFF;
break;
case INDICATOR_ALT_BLINK_OFF:
selector = HUB_LED_AMBER;
mode = INDICATOR_ALT_BLINK;
break;
default:
continue;
}
if (selector != HUB_LED_AUTO)
changed = 1;
set_port_led(hdev, i + 1, selector);
hub->indicator[i] = mode;
}
if (!changed && blinkenlights) {
cursor++;
cursor %= hub->descriptor->bNbrPorts;
set_port_led(hdev, cursor + 1, HUB_LED_GREEN);
hub->indicator[cursor] = INDICATOR_CYCLE;
changed++;
}
if (changed)
schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
}
/*
* USB 2.0 spec Section 11.24.2.6
*/
static int get_hub_status(struct usb_device *hdev,
struct usb_hub_status *data)
{
return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
data, sizeof(*data), HZ * USB_CTRL_GET_TIMEOUT);
}
/*
* USB 2.0 spec Section 11.24.2.7
*/
static int get_port_status(struct usb_device *hdev, int port,
struct usb_port_status *data)
{
return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port,
data, sizeof(*data), HZ * USB_CTRL_GET_TIMEOUT);
}
/* completion function, fires on port status changes and various faults */
static void hub_irq(struct urb *urb, struct pt_regs *regs)
{
struct usb_hub *hub = (struct usb_hub *)urb->context;
int status;
spin_lock(&hub_event_lock);
hub->urb_active = 0;
if (hub->urb_complete) { /* disconnect or rmmod */
complete(hub->urb_complete);
goto done;
}
switch (urb->status) {
case -ENOENT: /* synchronous unlink */
case -ECONNRESET: /* async unlink */
case -ESHUTDOWN: /* hardware going away */
goto done;
default: /* presumably an error */
/* Cause a hub reset after 10 consecutive errors */
dev_dbg (&hub->intf->dev, "transfer --> %d\n", urb->status);
if ((++hub->nerrors < 10) || hub->error)
goto resubmit;
hub->error = urb->status;
/* FALL THROUGH */
/* let khubd handle things */
case 0: /* we got data: port status changed */
break;
}
hub->nerrors = 0;
/* Something happened, let khubd figure it out */
if (list_empty(&hub->event_list)) {
list_add(&hub->event_list, &hub_event_list);
wake_up(&khubd_wait);
}
resubmit:
if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
/* ENODEV means we raced disconnect() */
&& status != -ENODEV)
dev_err (&hub->intf->dev, "resubmit --> %d\n", urb->status);
if (status == 0)
hub->urb_active = 1;
done:
spin_unlock(&hub_event_lock);
}
/* USB 2.0 spec Section 11.24.2.3 */
static inline int
hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
{
return usb_control_msg (hdev, usb_rcvctrlpipe (hdev, 0),
HUB_CLEAR_TT_BUFFER, USB_RT_PORT,
devinfo, tt, 0, 0, HZ);
}
/*
* enumeration blocks khubd for a long time. we use keventd instead, since
* long blocking there is the exception, not the rule. accordingly, HCDs
* talking to TTs must queue control transfers (not just bulk and iso), so
* both can talk to the same hub concurrently.
*/
static void hub_tt_kevent (void *arg)
{
struct usb_hub *hub = arg;
unsigned long flags;
spin_lock_irqsave (&hub->tt.lock, flags);
while (!list_empty (&hub->tt.clear_list)) {
struct list_head *temp;
struct usb_tt_clear *clear;
struct usb_device *hdev;
int status;
temp = hub->tt.clear_list.next;
clear = list_entry (temp, struct usb_tt_clear, clear_list);
list_del (&clear->clear_list);
/* drop lock so HCD can concurrently report other TT errors */
spin_unlock_irqrestore (&hub->tt.lock, flags);
hdev = interface_to_usbdev (hub->intf);
status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
spin_lock_irqsave (&hub->tt.lock, flags);
if (status)
dev_err (&hdev->dev,
"clear tt %d (%04x) error %d\n",
clear->tt, clear->devinfo, status);
kfree (clear);
}
spin_unlock_irqrestore (&hub->tt.lock, flags);
}
/**
* usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
* @dev: the device whose split transaction failed
* @pipe: identifies the endpoint of the failed transaction
*
* High speed HCDs use this to tell the hub driver that some split control or
* bulk transaction failed in a way that requires clearing internal state of
* a transaction translator. This is normally detected (and reported) from
* interrupt context.
*
* It may not be possible for that hub to handle additional full (or low)
* speed transactions until that state is fully cleared out.
*/
void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
{
struct usb_tt *tt = udev->tt;
unsigned long flags;
struct usb_tt_clear *clear;
/* we've got to cope with an arbitrary number of pending TT clears,
* since each TT has "at least two" buffers that can need it (and
* there can be many TTs per hub). even if they're uncommon.
*/
if ((clear = kmalloc (sizeof *clear, SLAB_ATOMIC)) == 0) {
dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
/* FIXME recover somehow ... RESET_TT? */
return;
}
/* info that CLEAR_TT_BUFFER needs */
clear->tt = tt->multi ? udev->ttport : 1;
clear->devinfo = usb_pipeendpoint (pipe);
clear->devinfo |= udev->devnum << 4;
clear->devinfo |= usb_pipecontrol (pipe)
? (USB_ENDPOINT_XFER_CONTROL << 11)
: (USB_ENDPOINT_XFER_BULK << 11);
if (usb_pipein (pipe))
clear->devinfo |= 1 << 15;
/* tell keventd to clear state for this TT */
spin_lock_irqsave (&tt->lock, flags);
list_add_tail (&clear->clear_list, &tt->clear_list);
schedule_work (&tt->kevent);
spin_unlock_irqrestore (&tt->lock, flags);
}
static void hub_power_on(struct usb_hub *hub)
{
struct usb_device *hdev;
int i;
/* if hub supports power switching, enable power on each port */
if ((hub->descriptor->wHubCharacteristics & HUB_CHAR_LPSM) < 2) {
dev_dbg(&hub->intf->dev, "enabling power on all ports\n");
hdev = interface_to_usbdev(hub->intf);
for (i = 0; i < hub->descriptor->bNbrPorts; i++)
set_port_feature(hdev, i + 1, USB_PORT_FEAT_POWER);
}
/* Wait for power to be enabled */
msleep(hub->descriptor->bPwrOn2PwrGood * 2);
}
static int hub_hub_status(struct usb_hub *hub,
u16 *status, u16 *change)
{
struct usb_device *hdev = interface_to_usbdev (hub->intf);
int ret;
ret = get_hub_status(hdev, &hub->status->hub);
if (ret < 0)
dev_err (&hub->intf->dev,
"%s failed (err = %d)\n", __FUNCTION__, ret);
else {
*status = le16_to_cpu(hub->status->hub.wHubStatus);
*change = le16_to_cpu(hub->status->hub.wHubChange);
ret = 0;
}
return ret;
}
static int hub_configure(struct usb_hub *hub,
struct usb_endpoint_descriptor *endpoint)
{
struct usb_device *hdev = interface_to_usbdev (hub->intf);
struct device *hub_dev = &hub->intf->dev;
u16 hubstatus, hubchange;
unsigned int pipe;
int maxp, ret;
char *message;
hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
&hub->buffer_dma);
if (!hub->buffer) {
message = "can't allocate hub irq buffer";
ret = -ENOMEM;
goto fail;
}
hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
if (!hub->status) {
message = "can't kmalloc hub status buffer";
ret = -ENOMEM;
goto fail;
}
hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
if (!hub->descriptor) {
message = "can't kmalloc hub descriptor";
ret = -ENOMEM;
goto fail;
}
/* Request the entire hub descriptor.
* hub->descriptor can handle USB_MAXCHILDREN ports,
* but the hub can/will return fewer bytes here.
*/
ret = get_hub_descriptor(hdev, hub->descriptor,
sizeof(*hub->descriptor));
if (ret < 0) {
message = "can't read hub descriptor";
goto fail;
} else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
message = "hub has too many ports!";
ret = -ENODEV;
goto fail;
}
hdev->maxchild = hub->descriptor->bNbrPorts;
dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
(hdev->maxchild == 1) ? "" : "s");
le16_to_cpus(&hub->descriptor->wHubCharacteristics);
if (hub->descriptor->wHubCharacteristics & HUB_CHAR_COMPOUND) {
int i;
char portstr [USB_MAXCHILDREN + 1];
for (i = 0; i < hdev->maxchild; i++)
portstr[i] = hub->descriptor->DeviceRemovable
[((i + 1) / 8)] & (1 << ((i + 1) % 8))
? 'F' : 'R';
portstr[hdev->maxchild] = 0;
dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
} else
dev_dbg(hub_dev, "standalone hub\n");
switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_LPSM) {
case 0x00:
dev_dbg(hub_dev, "ganged power switching\n");
break;
case 0x01:
dev_dbg(hub_dev, "individual port power switching\n");
break;
case 0x02:
case 0x03:
dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
break;
}
switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_OCPM) {
case 0x00:
dev_dbg(hub_dev, "global over-current protection\n");
break;
case 0x08:
dev_dbg(hub_dev, "individual port over-current protection\n");
break;
case 0x10:
case 0x18:
dev_dbg(hub_dev, "no over-current protection\n");
break;
}
spin_lock_init (&hub->tt.lock);
INIT_LIST_HEAD (&hub->tt.clear_list);
INIT_WORK (&hub->tt.kevent, hub_tt_kevent, hub);
switch (hdev->descriptor.bDeviceProtocol) {
case 0:
break;
case 1:
dev_dbg(hub_dev, "Single TT\n");
hub->tt.hub = hdev;
break;
case 2:
ret = usb_set_interface(hdev, 0, 1);
if (ret == 0) {
dev_dbg(hub_dev, "TT per port\n");
hub->tt.multi = 1;
} else
dev_err(hub_dev, "Using single TT (err %d)\n",
ret);
hub->tt.hub = hdev;
break;
default:
dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
hdev->descriptor.bDeviceProtocol);
break;
}
switch (hub->descriptor->wHubCharacteristics & HUB_CHAR_TTTT) {
case 0x00:
if (hdev->descriptor.bDeviceProtocol != 0)
dev_dbg(hub_dev, "TT requires at most 8 FS bit times\n");
break;
case 0x20:
dev_dbg(hub_dev, "TT requires at most 16 FS bit times\n");
break;
case 0x40:
dev_dbg(hub_dev, "TT requires at most 24 FS bit times\n");
break;
case 0x60:
dev_dbg(hub_dev, "TT requires at most 32 FS bit times\n");
break;
}
/* probe() zeroes hub->indicator[] */
if (hub->descriptor->wHubCharacteristics & HUB_CHAR_PORTIND) {
hub->has_indicators = 1;
dev_dbg(hub_dev, "Port indicators are supported\n");
}
dev_dbg(hub_dev, "power on to power good time: %dms\n",
hub->descriptor->bPwrOn2PwrGood * 2);
/* power budgeting mostly matters with bus-powered hubs,
* and battery-powered root hubs (may provide just 8 mA).
*/
ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
if (ret < 0) {
message = "can't get hub status";
goto fail;
}
cpu_to_le16s(&hubstatus);
if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
hub->descriptor->bHubContrCurrent);
hub->power_budget = (501 - hub->descriptor->bHubContrCurrent)
/ 2;
dev_dbg(hub_dev, "%dmA bus power budget for children\n",
hub->power_budget * 2);
}
ret = hub_hub_status(hub, &hubstatus, &hubchange);
if (ret < 0) {
message = "can't get hub status";
goto fail;
}
/* local power status reports aren't always correct */
if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
dev_dbg(hub_dev, "local power source is %s\n",
(hubstatus & HUB_STATUS_LOCAL_POWER)
? "lost (inactive)" : "good");
if ((hub->descriptor->wHubCharacteristics & HUB_CHAR_OCPM) == 0)
dev_dbg(hub_dev, "%sover-current condition exists\n",
(hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
/* Start the interrupt endpoint */
pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
if (maxp > sizeof(*hub->buffer))
maxp = sizeof(*hub->buffer);
hub->urb = usb_alloc_urb(0, GFP_KERNEL);
if (!hub->urb) {
message = "couldn't allocate interrupt urb";
ret = -ENOMEM;
goto fail;
}
usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
hub, endpoint->bInterval);
hub->urb->transfer_dma = hub->buffer_dma;
hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
ret = usb_submit_urb(hub->urb, GFP_KERNEL);
if (ret) {
message = "couldn't submit status urb";
goto fail;
}
hub->urb_active = 1;
/* Wake up khubd */
wake_up(&khubd_wait);
/* maybe start cycling the hub leds */
if (hub->has_indicators && blinkenlights) {
set_port_led(hdev, 1, HUB_LED_GREEN);
hub->indicator [0] = INDICATOR_CYCLE;
schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
}
hub_power_on(hub);
return 0;
fail:
dev_err (hub_dev, "config failed, %s (err %d)\n",
message, ret);
/* hub_disconnect() frees urb and descriptor */
return ret;
}
static unsigned highspeed_hubs;
static void hub_disconnect(struct usb_interface *intf)
{
struct usb_hub *hub = usb_get_intfdata (intf);
DECLARE_COMPLETION(urb_complete);
unsigned long flags;
if (!hub)
return;
if (interface_to_usbdev(intf)->speed == USB_SPEED_HIGH)
highspeed_hubs--;
usb_set_intfdata (intf, NULL);
spin_lock_irqsave(&hub_event_lock, flags);
hub->urb_complete = &urb_complete;
/* Delete it and then reset it */
list_del_init(&hub->event_list);
list_del_init(&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);
/* assuming we used keventd, it must quiesce too */
if (hub->has_indicators)
cancel_delayed_work (&hub->leds);
if (hub->has_indicators || hub->tt.hub)
flush_scheduled_work ();
if (hub->urb) {
usb_unlink_urb(hub->urb);
if (hub->urb_active)
wait_for_completion(&urb_complete);
usb_free_urb(hub->urb);
hub->urb = NULL;
}
if (hub->descriptor) {
kfree(hub->descriptor);
hub->descriptor = NULL;
}
if (hub->status) {
kfree(hub->status);
hub->status = NULL;
}
if (hub->buffer) {
usb_buffer_free(interface_to_usbdev(intf),
sizeof(*hub->buffer), hub->buffer,
hub->buffer_dma);
hub->buffer = NULL;
}
/* Free the memory */
kfree(hub);
}
static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
struct usb_host_interface *desc;
struct usb_endpoint_descriptor *endpoint;
struct usb_device *hdev;
struct usb_hub *hub;
struct device *hub_dev;
unsigned long flags;
desc = intf->cur_altsetting;
hdev = interface_to_usbdev(intf);
hub_dev = &intf->dev;
/* Some hubs have a subclass of 1, which AFAICT according to the */
/* specs is not defined, but it works */
if ((desc->desc.bInterfaceSubClass != 0) &&
(desc->desc.bInterfaceSubClass != 1)) {
descriptor_error:
dev_err (hub_dev, "bad descriptor, ignoring hub\n");
return -EIO;
}
/* Multiple endpoints? What kind of mutant ninja-hub is this? */
if (desc->desc.bNumEndpoints != 1) {
goto descriptor_error;
}
endpoint = &desc->endpoint[0].desc;
/* Output endpoint? Curiouser and curiouser.. */
if (!(endpoint->bEndpointAddress & USB_DIR_IN)) {
goto descriptor_error;
}
/* If it's not an interrupt endpoint, we'd better punt! */
if ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
!= USB_ENDPOINT_XFER_INT) {
goto descriptor_error;
return -EIO;
}
/* We found a hub */
dev_info (hub_dev, "USB hub found\n");
hub = kmalloc(sizeof(*hub), GFP_KERNEL);
if (!hub) {
dev_dbg (hub_dev, "couldn't kmalloc hub struct\n");
return -ENOMEM;
}
memset(hub, 0, sizeof(*hub));
INIT_LIST_HEAD(&hub->event_list);
hub->intf = intf;
init_MUTEX(&hub->khubd_sem);
INIT_WORK(&hub->leds, led_work, hub);
/* 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);
usb_set_intfdata (intf, hub);
if (hdev->speed == USB_SPEED_HIGH)
highspeed_hubs++;
if (hub_configure(hub, endpoint) >= 0)
return 0;
hub_disconnect (intf);
return -ENODEV;
}
static int
hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
{
struct usb_device *hdev = interface_to_usbdev (intf);
/* 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 (hdev->devnum <= 0)
info->nports = 0;
else {
info->nports = hdev->maxchild;
for (i = 0; i < info->nports; i++) {
if (hdev->children[i] == NULL)
info->port[i] = 0;
else
info->port[i] =
hdev->children[i]->devnum;
}
}
spin_unlock_irqrestore(&hub_event_lock, flags);
return info->nports + 1;
}
default:
return -ENOSYS;
}
}
static int hub_reset(struct usb_hub *hub)
{
struct usb_device *hdev = interface_to_usbdev(hub->intf);
int i;
/* Disconnect any attached devices */
for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
if (hdev->children[i])
usb_disconnect(&hdev->children[i]);
}
/* Attempt to reset the hub */
if (hub->urb)
usb_unlink_urb(hub->urb);
else
return -1;
if (usb_reset_device(hdev))
return -1;
hub->urb->dev = hdev;
if (usb_submit_urb(hub->urb, GFP_KERNEL))
return -1;
hub_power_on(hub);
return 0;
}
static void hub_start_disconnect(struct usb_device *hdev)
{
struct usb_device *parent = hdev->parent;
int i;
/* Find the device pointer to disconnect */
if (parent) {
for (i = 0; i < parent->maxchild; i++) {
if (parent->children[i] == hdev) {
usb_disconnect(&parent->children[i]);
return;
}
}
}
dev_err(&hdev->dev, "cannot disconnect hub!\n");
}
static int hub_port_status(struct usb_device *hdev, int port,
u16 *status, u16 *change)
{
struct usb_hub *hub = usb_get_intfdata(hdev->actconfig->interface[0]);
int ret;
if (!hub)
return -ENODEV;
ret = get_port_status(hdev, port + 1, &hub->status->port);
if (ret < 0)
dev_err (&hub->intf->dev,
"%s failed (err = %d)\n", __FUNCTION__, ret);
else {
*status = le16_to_cpu(hub->status->port.wPortStatus);
*change = le16_to_cpu(hub->status->port.wPortChange);
ret = 0;
}
return ret;
}
#define PORT_RESET_TRIES 5
#define SET_ADDRESS_TRIES 2
#define GET_DESCRIPTOR_TRIES 2
#define SET_CONFIG_TRIES 2
#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
#define HUB_SHORT_RESET_TIME 10
#define HUB_LONG_RESET_TIME 200
#define HUB_RESET_TIMEOUT 500
static int hub_port_wait_reset(struct usb_device *hdev, int port,
struct usb_device *udev, 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 */
msleep(delay);
/* read and decode port status */
ret = hub_port_status(hdev, port, &portstatus, &portchange);
if (ret < 0)
return ret;
/* Device went away? */
if (!(portstatus & USB_PORT_STAT_CONNECTION))
return -ENOTCONN;
/* bomb out completely if something weird happened */
if ((portchange & USB_PORT_STAT_C_CONNECTION))
return -EINVAL;
/* 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)
udev->speed = USB_SPEED_HIGH;
else if (portstatus & USB_PORT_STAT_LOW_SPEED)
udev->speed = USB_SPEED_LOW;
else
udev->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;
dev_dbg (hubdev (hdev),
"port %d not reset yet, waiting %dms\n",
port + 1, delay);
}
return -EBUSY;
}
static int hub_port_reset(struct usb_device *hdev, int port,
struct usb_device *udev, unsigned int delay)
{
int i, status;
struct device *hub_dev = hubdev (hdev);
/* Reset the port */
for (i = 0; i < PORT_RESET_TRIES; i++) {
set_port_feature(hdev, port + 1, USB_PORT_FEAT_RESET);
/* return on disconnect or reset */
status = hub_port_wait_reset(hdev, port, udev, delay);
if (status == -ENOTCONN || status == 0) {
clear_port_feature(hdev,
port + 1, USB_PORT_FEAT_C_RESET);
udev->state = status
? USB_STATE_NOTATTACHED
: USB_STATE_DEFAULT;
return status;
}
dev_dbg (hub_dev,
"port %d not enabled, trying reset again...\n",
port + 1);
delay = HUB_LONG_RESET_TIME;
}
dev_err (hub_dev,
"Cannot enable port %i. Maybe the USB cable is bad?\n",
port + 1);
return status;
}
static int hub_port_disable(struct usb_device *hdev, int port)
{
int ret;
ret = clear_port_feature(hdev, port + 1, USB_PORT_FEAT_ENABLE);
if (ret)
dev_err(hubdev(hdev), "cannot disable port %d (err = %d)\n",
port + 1, ret);
return 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 25ms for transient disconnects to restart the delay.
*/
#define HUB_DEBOUNCE_TIMEOUT 400
#define HUB_DEBOUNCE_STEP 25
#define HUB_DEBOUNCE_STABLE 4
static int hub_port_debounce(struct usb_device *hdev, int port)
{
int ret;
int delay_time, stable_count;
u16 portchange, portstatus;
unsigned connection;
connection = 0;
stable_count = 0;
for (delay_time = 0; delay_time < HUB_DEBOUNCE_TIMEOUT; delay_time += HUB_DEBOUNCE_STEP) {
msleep(HUB_DEBOUNCE_STEP);
ret = hub_port_status(hdev, port, &portstatus, &portchange);
if (ret < 0)
return ret;
if ((portstatus & USB_PORT_STAT_CONNECTION) == connection) {
if (connection) {
if (++stable_count == HUB_DEBOUNCE_STABLE)
break;
}
} else {
stable_count = 0;
}
connection = portstatus & USB_PORT_STAT_CONNECTION;
if ((portchange & USB_PORT_STAT_C_CONNECTION)) {
clear_port_feature(hdev, port+1, USB_PORT_FEAT_C_CONNECTION);
}
}
dev_dbg (hubdev (hdev),
"debounce: port %d: delay %dms stable %d status 0x%x\n",
port + 1, delay_time, stable_count, portstatus);
return (portstatus & USB_PORT_STAT_CONNECTION) ? 0 : -ENOTCONN;
}
static int hub_set_address(struct usb_device *udev)
{
int retval;
if (udev->devnum == 0)
return -EINVAL;
if (udev->state != USB_STATE_DEFAULT &&
udev->state != USB_STATE_ADDRESS)
return -EINVAL;
retval = usb_control_msg(udev, usb_snddefctrl(udev),
USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
NULL, 0, HZ * USB_CTRL_SET_TIMEOUT);
if (retval == 0)
udev->state = USB_STATE_ADDRESS;
return retval;
}
/* reset device, (re)assign address, get device descriptor.
* device connection is stable, no more debouncing needed.
* returns device in USB_STATE_ADDRESS, except on error.
* on error return, device is no longer usable (ref dropped).
*
* caller owns dev->serialize for the device, guarding against
* config changes and disconnect processing.
*/
static int
hub_port_init (struct usb_device *hdev, struct usb_device *udev, int port)
{
static DECLARE_MUTEX(usb_address0_sem);
int i, j, retval;
unsigned delay = HUB_SHORT_RESET_TIME;
enum usb_device_speed oldspeed = udev->speed;
/* root hub ports have a slightly longer reset period
* (from USB 2.0 spec, section 7.1.7.5)
*/
if (!hdev->parent)
delay = HUB_ROOT_RESET_TIME;
/* Some low speed devices have problems with the quick delay, so */
/* be a bit pessimistic with those devices. RHbug #23670 */
if (oldspeed == USB_SPEED_LOW)
delay = HUB_LONG_RESET_TIME;
down(&usb_address0_sem);
/* Reset the device; full speed may morph to high speed */
retval = hub_port_reset(hdev, port, udev, delay);
if (retval < 0) /* error or disconnect */
goto fail;
/* success, speed is known */
retval = -ENODEV;
if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
dev_dbg(&udev->dev, "device reset changed speed!\n");
goto fail;
}
/* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
* it's fixed size except for full speed devices.
*/
switch (udev->speed) {
case USB_SPEED_HIGH: /* fixed at 64 */
i = 64;
break;
case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
/* to determine the ep0 maxpacket size, read the first 8
* bytes from the device descriptor to get bMaxPacketSize0;
* then correct our initial (small) guess.
*/
// FALLTHROUGH
case USB_SPEED_LOW: /* fixed at 8 */
i = 8;
break;
default:
goto fail;
}
udev->epmaxpacketin [0] = i;
udev->epmaxpacketout[0] = i;
/* set the address */
if (udev->devnum <= 0) {
usb_choose_address(udev);
if (udev->devnum <= 0)
goto fail;
/* Set up TT records, if needed */
if (hdev->tt) {
udev->tt = hdev->tt;
udev->ttport = hdev->ttport;
} else if (udev->speed != USB_SPEED_HIGH
&& hdev->speed == USB_SPEED_HIGH) {
struct usb_hub *hub;
hub = usb_get_intfdata (hdev->actconfig
->interface[0]);
udev->tt = &hub->tt;
udev->ttport = port + 1;
}
/* force the right log message (below) at low speed */
oldspeed = USB_SPEED_UNKNOWN;
}
dev_info (&udev->dev,
"%s %s speed USB device using address %d\n",
(oldspeed == USB_SPEED_UNKNOWN) ? "new" : "reset",
({ char *speed; switch (udev->speed) {
case USB_SPEED_LOW: speed = "low"; break;
case USB_SPEED_FULL: speed = "full"; break;
case USB_SPEED_HIGH: speed = "high"; break;
default: speed = "?"; break;
}; speed;}),
udev->devnum);
/* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
* Because device hardware and firmware is sometimes buggy in
* this area, and this is how Linux has done it for ages.
* Change it cautiously.
*
* NOTE: Windows gets the descriptor first, seemingly to help
* work around device bugs like "can't use addresses with bit 3
* set in certain configurations". Yes, really.
*/
for (i = 0; i < GET_DESCRIPTOR_TRIES; ++i) {
for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
retval = hub_set_address(udev);
if (retval >= 0)
break;
msleep(200);
}
if (retval < 0) {
dev_err(&udev->dev,
"device not accepting address %d, error %d\n",
udev->devnum, retval);
fail:
hub_port_disable(hdev, port);
usb_release_address(udev);
usb_put_dev(udev);
up(&usb_address0_sem);
return retval;
}
/* cope with hardware quirkiness:
* - let SET_ADDRESS settle, some device hardware wants it
* - read ep0 maxpacket even for high and low speed,
*/
msleep(10);
retval = usb_get_device_descriptor(udev, 8);
if (retval >= 8)
break;
msleep(100);
}
if (retval != 8) {
dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
"8", retval);
if (retval >= 0)
retval = -EMSGSIZE;
goto fail;
}
if (udev->speed == USB_SPEED_FULL
&& (udev->epmaxpacketin [0]
!= udev->descriptor.bMaxPacketSize0)) {
usb_disable_endpoint(udev, 0);
usb_endpoint_running(udev, 0, 1);
usb_endpoint_running(udev, 0, 0);
udev->epmaxpacketin [0] = udev->descriptor.bMaxPacketSize0;
udev->epmaxpacketout[0] = udev->descriptor.bMaxPacketSize0;
}
retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
if (retval < (signed)sizeof(udev->descriptor)) {
dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
"all", retval);
if (retval >= 0)
retval = -ENOMSG;
goto fail;
}
/* now dev is visible to other tasks */
hdev->children[port] = udev;
up(&usb_address0_sem);
return 0;
}
static void
check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port)
{
struct usb_qualifier_descriptor *qual;
int status;
qual = kmalloc (sizeof *qual, SLAB_KERNEL);
if (qual == 0)
return;
status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
qual, sizeof *qual);
if (status == sizeof *qual) {
dev_info(&udev->dev, "not running at top speed; "
"connect to a high speed hub\n");
/* hub LEDs are probably harder to miss than syslog */
if (hub->has_indicators) {
hub->indicator[port] = INDICATOR_GREEN_BLINK;
schedule_work (&hub->leds);
}
}
kfree (qual);
}
static unsigned
hub_power_remaining (struct usb_hub *hub, struct usb_device *hdev)
{
int remaining;
unsigned i;
remaining = hub->power_budget;
if (!remaining) /* self-powered */
return 0;
for (i = 0; i < hdev->maxchild; i++) {
struct usb_device *udev = hdev->children[i];
int delta;
if (!udev)
continue;
if (udev->actconfig)
delta = udev->actconfig->desc.bMaxPower;
else
delta = 50;
// dev_dbg(&udev->dev, "budgeted %dmA\n", 2 * delta);
remaining -= delta;
}
if (remaining < 0) {
dev_warn(&hub->intf->dev,
"%dmA over power budget!\n",
-2 * remaining);
remaining = 0;
}
return remaining;
}
static void hub_port_connect_change(struct usb_hub *hub, int port,
u16 portstatus, u16 portchange)
{
struct usb_device *hdev = interface_to_usbdev(hub->intf);
struct device *hub_dev = &hub->intf->dev;
int status, i;
dev_dbg (hub_dev,
"port %d, status %04x, change %04x, %s\n",
port + 1, portstatus, portchange, portspeed (portstatus));
/* Clear the connection change status */
clear_port_feature(hdev, port + 1, USB_PORT_FEAT_C_CONNECTION);
if (hub->has_indicators) {
set_port_led(hdev, port + 1, HUB_LED_AUTO);
hub->indicator[port] = INDICATOR_AUTO;
}
/* Disconnect any existing devices under this port */
if (hdev->children[port])
usb_disconnect(&hdev->children[port]);
/* Return now if nothing is connected */
if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
/* maybe switch power back on (e.g. root hub was reset) */
if ((hub->descriptor->wHubCharacteristics
& HUB_CHAR_LPSM) < 2
&& !(portstatus & (1 << USB_PORT_FEAT_POWER)))
set_port_feature(hdev, port + 1, USB_PORT_FEAT_POWER);
if (portstatus & USB_PORT_STAT_ENABLE)
goto done;
return;
}
if (hub_port_debounce(hdev, port)) {
dev_err (hub_dev,
"connect-debounce failed, port %d disabled\n",
port+1);
goto done;
}
for (i = 0; i < SET_CONFIG_TRIES; i++) {
struct usb_device *udev;
/* reallocate for each attempt, since references
* to the previous one can escape in various ways
*/
udev = usb_alloc_dev(hdev, hdev->bus, port);
if (!udev) {
dev_err (hub_dev,
"couldn't allocate port %d usb_device\n", port+1);
goto done;
}
udev->state = USB_STATE_POWERED;
/* hub can tell if it's lowspeed already: D- pullup (not D+) */
if (portstatus & USB_PORT_STAT_LOW_SPEED)
udev->speed = USB_SPEED_LOW;
else
udev->speed = USB_SPEED_UNKNOWN;
/* reset, set address, get descriptor, add to hub's children */
down (&udev->serialize);
status = hub_port_init(hdev, udev, port);
if (status == -ENOTCONN)
break;
if (status < 0)
continue;
/* consecutive bus-powered hubs aren't reliable; they can
* violate the voltage drop budget. if the new child has
* a "powered" LED, users should notice we didn't enable it
* (without reading syslog), even without per-port LEDs
* on the parent.
*/
if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
&& hub->power_budget) {
u16 devstat;
status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
&devstat);
if (status < 0) {
dev_dbg(&udev->dev, "get status %d ?\n", status);
continue;
}
cpu_to_le16s(&devstat);
if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
dev_err(&udev->dev,
"can't connect bus-powered hub "
"to this port\n");
if (hub->has_indicators) {
hub->indicator[port] =
INDICATOR_AMBER_BLINK;
schedule_work (&hub->leds);
}
hdev->children[port] = NULL;
usb_put_dev(udev);
hub_port_disable(hdev, port);
return;
}
}
/* check for devices running slower than they could */
if (udev->descriptor.bcdUSB >= 0x0200
&& udev->speed == USB_SPEED_FULL
&& highspeed_hubs != 0)
check_highspeed (hub, udev, port);
/* Run it through the hoops (find a driver, etc) */
status = usb_new_device(udev);
if (status != 0) {
hdev->children[port] = NULL;
continue;
}
up (&udev->serialize);
status = hub_power_remaining(hub, hdev);
if (status)
dev_dbg(hub_dev,
"%dmA power budget left\n",
2 * status);
return;
}
done:
hub_port_disable(hdev, port);
}
static void hub_events(void)
{
unsigned long flags;
struct list_head *tmp;
struct usb_device *hdev;
struct usb_hub *hub;
struct device *hub_dev;
u16 hubstatus;
u16 hubchange;
u16 portstatus;
u16 portchange;
int i, ret;
/*
* We restart the list every time 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);
hdev = interface_to_usbdev(hub->intf);
hub_dev = &hub->intf->dev;
list_del_init(tmp);
if (unlikely(down_trylock(&hub->khubd_sem)))
BUG(); /* never blocks, we were on list */
spin_unlock_irqrestore(&hub_event_lock, flags);
if (hub->error) {
dev_dbg (hub_dev, "resetting for error %d\n",
hub->error);
if (hub_reset(hub)) {
dev_dbg (hub_dev,
"can't reset; disconnecting\n");
up(&hub->khubd_sem);
hub_start_disconnect(hdev);
continue;
}
hub->nerrors = 0;
hub->error = 0;
}
for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
ret = hub_port_status(hdev, i, &portstatus, &portchange);
if (ret < 0) {
continue;
}
if (portchange & USB_PORT_STAT_C_CONNECTION) {
hub_port_connect_change(hub, i, portstatus, portchange);
} else if (portchange & USB_PORT_STAT_C_ENABLE) {
dev_dbg (hub_dev,
"port %d enable change, status %08x\n",
i + 1, portstatus);
clear_port_feature(hdev,
i + 1, USB_PORT_FEAT_C_ENABLE);
/*
* EM interference sometimes causes badly
* 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)
&& (hdev->children[i])) {
dev_err (hub_dev,
"port %i "
"disabled by hub (EMI?), "
"re-enabling...",
i + 1);
hub_port_connect_change(hub,
i, portstatus, portchange);
}
}
if (portchange & USB_PORT_STAT_C_SUSPEND) {
dev_dbg (hub_dev,
"suspend change on port %d\n",
i + 1);
clear_port_feature(hdev,
i + 1, USB_PORT_FEAT_C_SUSPEND);
}
if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
dev_err (hub_dev,
"over-current change on port %d\n",
i + 1);
clear_port_feature(hdev,
i + 1, USB_PORT_FEAT_C_OVER_CURRENT);
hub_power_on(hub);
}
if (portchange & USB_PORT_STAT_C_RESET) {
dev_dbg (hub_dev,
"reset change on port %d\n",
i + 1);
clear_port_feature(hdev,
i + 1, USB_PORT_FEAT_C_RESET);
}
} /* end for i */
/* deal with hub status changes */
if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
dev_err (hub_dev, "get_hub_status failed\n");
else {
if (hubchange & HUB_CHANGE_LOCAL_POWER) {
dev_dbg (hub_dev, "power change\n");
clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
}
if (hubchange & HUB_CHANGE_OVERCURRENT) {
dev_dbg (hub_dev, "overcurrent change\n");
msleep(500); /* Cool down */
clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
hub_power_on(hub);
}
}
up(&hub->khubd_sem);
} /* end while (1) */
spin_unlock_irqrestore(&hub_event_lock, flags);
}
static int hub_thread(void *__unused)
{
/*
* This thread doesn't need any user-level access,
* so get rid of all our resources
*/
daemonize("khubd");
allow_signal(SIGKILL);
/* Send me a signal to get me die (for debugging) */
do {
hub_events();
wait_event_interruptible(khubd_wait, !list_empty(&hub_event_list));
if (current->flags & PF_FREEZE)
refrigerator(PF_FREEZE);
} while (!signal_pending(current));
pr_debug ("%s: khubd exiting\n", usbcore_name);
complete_and_exit(&khubd_exited, 0);
}
static struct usb_device_id hub_id_table [] = {
{ .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
.bDeviceClass = USB_CLASS_HUB},
{ .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 = {
.owner = THIS_MODULE,
.name = "hub",
.probe = hub_probe,
.disconnect = hub_disconnect,
.ioctl = hub_ioctl,
.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) {
printk(KERN_ERR "%s: can't register hub driver\n",
usbcore_name);
return -1;
}
pid = kernel_thread(hub_thread, NULL, CLONE_KERNEL);
if (pid >= 0) {
khubd_pid = pid;
return 0;
}
/* Fall through if kernel_thread failed */
usb_deregister(&hub_driver);
printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
return -1;
}
void usb_hub_cleanup(void)
{
int ret;
/* Kill the thread */
ret = kill_proc(khubd_pid, SIGKILL, 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() */
static int config_descriptors_changed(struct usb_device *udev)
{
unsigned index;
unsigned len = 0;
struct usb_config_descriptor *buf;
for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
if (len < udev->config[index].desc.wTotalLength)
len = udev->config[index].desc.wTotalLength;
}
buf = kmalloc (len, SLAB_KERNEL);
if (buf == 0) {
dev_err(&udev->dev, "no mem to re-read configs after reset\n");
/* assume the worst */
return 1;
}
for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
int length;
int old_length = udev->config[index].desc.wTotalLength;
length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
old_length);
if (length < old_length) {
dev_dbg(&udev->dev, "config index %d, error %d\n",
index, length);
break;
}
if (memcmp (buf, udev->rawdescriptors[index], old_length)
!= 0) {
dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
index, buf->bConfigurationValue);
/* FIXME enable this when we can re-enumerate after reset;
* until then DFU-ish drivers need this and other workarounds
*/
// break;
}
}
kfree(buf);
return index != udev->descriptor.bNumConfigurations;
}
/*
* WARNING - don't reset any device unless drivers for all of its
* interfaces are expecting that reset! Maybe some driver->reset()
* method should eventually help ensure sufficient cooperation.
*
* This is the same as usb_reset_device() except that the caller
* already holds dev->serialize. For example, it's safe to use
* this from a driver probe() routine after downloading new firmware.
*/
int __usb_reset_device(struct usb_device *udev)
{
struct usb_device *parent = udev->parent;
struct usb_device_descriptor descriptor = udev->descriptor;
int i, ret, port = -1;
if (udev->maxchild) {
/* this requires hub- or hcd-specific logic;
* see hub_reset() and OHCI hc_restart()
*/
dev_dbg(&udev->dev, "%s for hub!\n", __FUNCTION__);
return -EINVAL;
}
for (i = 0; i < parent->maxchild; i++)
if (parent->children[i] == udev) {
port = i;
break;
}
if (port < 0)
return -ENOENT;
ret = hub_port_init(parent, udev, port);
if (ret < 0)
goto re_enumerate;
/* Device might have changed firmware (DFU or similar) */
if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
|| config_descriptors_changed (udev)) {
dev_info(&udev->dev, "device firmware changed\n");
udev->descriptor = descriptor; /* for disconnect() calls */
goto re_enumerate;
}
if (!udev->actconfig)
return 0;
ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
USB_REQ_SET_CONFIGURATION, 0,
udev->actconfig->desc.bConfigurationValue, 0,
NULL, 0, HZ * USB_CTRL_SET_TIMEOUT);
if (ret < 0) {
dev_err(&udev->dev,
"can't restore configuration #%d (error=%d)\n",
udev->actconfig->desc.bConfigurationValue, ret);
goto re_enumerate;
}
udev->state = USB_STATE_CONFIGURED;
for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
struct usb_interface *intf = udev->actconfig->interface[i];
struct usb_interface_descriptor *desc;
/* set_interface resets host side toggle and halt status even
* for altsetting zero. the interface may have no driver.
*/
desc = &intf->cur_altsetting->desc;
ret = usb_set_interface(udev, desc->bInterfaceNumber,
desc->bAlternateSetting);
if (ret < 0) {
dev_err(&udev->dev, "failed to restore interface %d "
"altsetting %d (error=%d)\n",
desc->bInterfaceNumber,
desc->bAlternateSetting,
ret);
goto re_enumerate;
}
}
return 0;
re_enumerate:
/* FIXME make some task re-enumerate; don't just mark unusable */
udev->state = USB_STATE_NOTATTACHED;
return -ENODEV;
}
EXPORT_SYMBOL(__usb_reset_device);
int usb_reset_device(struct usb_device *udev)
{
int r;
down(&udev->serialize);
r = __usb_reset_device(udev);
up(&udev->serialize);
return r;
}
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