#include "hcd.h"
#include "hub.h"
+#ifdef CONFIG_USB_PERSIST
+#define USB_PERSIST 1
+#else
+#define USB_PERSIST 0
+#endif
+
struct usb_hub {
struct device *intfdev; /* the "interface" device */
struct usb_device *hdev;
"try the other device initialization scheme if the "
"first one fails");
+/* Mutual exclusion for EHCI CF initialization. This interferes with
+ * port reset on some companion controllers.
+ */
+DECLARE_RWSEM(ehci_cf_port_reset_rwsem);
+EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem);
+
static inline char *portspeed(int portstatus)
{
to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
spin_lock_irqsave(&hub_event_lock, flags);
- if (!hub->disconnected & list_empty(&hub->event_list)) {
+ if (!hub->disconnected && list_empty(&hub->event_list)) {
list_add_tail(&hub->event_list, &hub_event_list);
wake_up(&khubd_wait);
}
static void hub_irq(struct urb *urb)
{
struct usb_hub *hub = urb->context;
- int status;
+ int status = urb->status;
int i;
unsigned long bits;
- switch (urb->status) {
+ switch (status) {
case -ENOENT: /* synchronous unlink */
case -ECONNRESET: /* async unlink */
case -ESHUTDOWN: /* hardware going away */
default: /* presumably an error */
/* Cause a hub reset after 10 consecutive errors */
- dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
+ dev_dbg (hub->intfdev, "transfer --> %d\n", status);
if ((++hub->nerrors < 10) || hub->error)
goto resubmit;
- hub->error = urb->status;
+ hub->error = status;
/* FALL THROUGH */
/* let khubd handle things */
struct usb_hub *hub =
container_of(work, struct usb_hub, tt.kevent);
unsigned long flags;
+ int limit = 100;
spin_lock_irqsave (&hub->tt.lock, flags);
- while (!list_empty (&hub->tt.clear_list)) {
+ while (--limit && !list_empty (&hub->tt.clear_list)) {
struct list_head *temp;
struct usb_tt_clear *clear;
struct usb_device *hdev = hub->hdev;
static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
{
struct usb_device *hdev = hub->hdev;
- int ret;
+ int ret = 0;
- if (hdev->children[port1-1] && set_state) {
+ if (hdev->children[port1-1] && set_state)
usb_set_device_state(hdev->children[port1-1],
USB_STATE_NOTATTACHED);
- }
- ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
+ if (!hub->error)
+ ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
if (ret)
dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
- port1, ret);
-
+ port1, ret);
return ret;
}
+/*
+ * Disable a port and mark a logical connnect-change event, so that some
+ * time later khubd will disconnect() any existing usb_device on the port
+ * and will re-enumerate if there actually is a device attached.
+ */
+static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
+{
+ dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
+ hub_port_disable(hub, port1, 1);
+
+ /* FIXME let caller ask to power down the port:
+ * - some devices won't enumerate without a VBUS power cycle
+ * - SRP saves power that way
+ * - ... new call, TBD ...
+ * That's easy if this hub can switch power per-port, and
+ * khubd reactivates the port later (timer, SRP, etc).
+ * Powerdown must be optional, because of reset/DFU.
+ */
+
+ set_bit(port1, hub->change_bits);
+ kick_khubd(hub);
+}
/* caller has locked the hub device */
-static void hub_pre_reset(struct usb_interface *intf)
+static int hub_pre_reset(struct usb_interface *intf)
{
struct usb_hub *hub = usb_get_intfdata(intf);
struct usb_device *hdev = hub->hdev;
- int port1;
+ int i;
- for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
- if (hdev->children[port1 - 1]) {
- usb_disconnect(&hdev->children[port1 - 1]);
- if (hub->error == 0)
- hub_port_disable(hub, port1, 0);
- }
+ /* Disconnect all the children */
+ for (i = 0; i < hdev->maxchild; ++i) {
+ if (hdev->children[i])
+ usb_disconnect(&hdev->children[i]);
}
hub_quiesce(hub);
+ return 0;
}
/* caller has locked the hub device */
-static void hub_post_reset(struct usb_interface *intf)
+static int hub_post_reset(struct usb_interface *intf)
{
struct usb_hub *hub = usb_get_intfdata(intf);
- hub_activate(hub);
hub_power_on(hub);
+ hub_activate(hub);
+ return 0;
}
-
static int hub_configure(struct usb_hub *hub,
struct usb_endpoint_descriptor *endpoint)
{
spin_unlock_irqrestore(&device_state_lock, flags);
}
-
-#ifdef CONFIG_PM
-
-/**
- * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
- * @rhdev: struct usb_device for the root hub
- *
- * The USB host controller driver calls this function when its root hub
- * is resumed and Vbus power has been interrupted or the controller
- * has been reset. The routine marks all the children of the root hub
- * as NOTATTACHED and marks logical connect-change events on their ports.
- */
-void usb_root_hub_lost_power(struct usb_device *rhdev)
-{
- struct usb_hub *hub;
- int port1;
- unsigned long flags;
-
- dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
-
- spin_lock_irqsave(&device_state_lock, flags);
- hub = hdev_to_hub(rhdev);
- for (port1 = 1; port1 <= rhdev->maxchild; ++port1) {
- if (rhdev->children[port1 - 1]) {
- recursively_mark_NOTATTACHED(
- rhdev->children[port1 - 1]);
- set_bit(port1, hub->change_bits);
- }
- }
- spin_unlock_irqrestore(&device_state_lock, flags);
-}
-EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
-
-#endif /* CONFIG_PM */
-
static void choose_address(struct usb_device *udev)
{
int devnum;
#ifdef CONFIG_USB_OTG
#include "otg_whitelist.h"
-static int __usb_port_suspend(struct usb_device *, int port1);
#endif
/**
- * usb_new_device - perform initial device setup (usbcore-internal)
+ * usb_configure_device_otg - FIXME (usbcore-internal)
* @udev: newly addressed device (in ADDRESS state)
*
- * This is called with devices which have been enumerated, but not yet
- * configured. The device descriptor is available, but not descriptors
- * for any device configuration. The caller must have locked either
- * the parent hub (if udev is a normal device) or else the
- * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
- * udev has already been installed, but udev is not yet visible through
- * sysfs or other filesystem code.
- *
- * It will return if the device is configured properly or not. Zero if
- * the interface was registered with the driver core; else a negative
- * errno value.
- *
- * This call is synchronous, and may not be used in an interrupt context.
- *
- * Only the hub driver or root-hub registrar should ever call this.
+ * Do configuration for On-The-Go devices
*/
-int usb_new_device(struct usb_device *udev)
+static int usb_configure_device_otg(struct usb_device *udev)
{
- int err;
-
- /* Determine quirks */
- usb_detect_quirks(udev);
-
- err = usb_get_configuration(udev);
- if (err < 0) {
- dev_err(&udev->dev, "can't read configurations, error %d\n",
- err);
- goto fail;
- }
-
- /* read the standard strings and cache them if present */
- udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
- udev->manufacturer = usb_cache_string(udev,
- udev->descriptor.iManufacturer);
- udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
-
- /* Tell the world! */
- dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
- "SerialNumber=%d\n",
- udev->descriptor.iManufacturer,
- udev->descriptor.iProduct,
- udev->descriptor.iSerialNumber);
- show_string(udev, "Product", udev->product);
- show_string(udev, "Manufacturer", udev->manufacturer);
- show_string(udev, "SerialNumber", udev->serial);
+ int err = 0;
#ifdef CONFIG_USB_OTG
/*
* (Includes HNP test device.)
*/
if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
- err = __usb_port_suspend(udev, udev->bus->otg_port);
+ err = usb_port_suspend(udev);
if (err < 0)
dev_dbg(&udev->dev, "HNP fail, %d\n", err);
}
- err = -ENODEV;
+ err = -ENOTSUPP;
goto fail;
}
+fail:
#endif
+ return err;
+}
+
+
+/**
+ * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal)
+ * @udev: newly addressed device (in ADDRESS state)
+ *
+ * This is only called by usb_new_device() and usb_authorize_device()
+ * and FIXME -- all comments that apply to them apply here wrt to
+ * environment.
+ *
+ * If the device is WUSB and not authorized, we don't attempt to read
+ * the string descriptors, as they will be errored out by the device
+ * until it has been authorized.
+ */
+static int usb_configure_device(struct usb_device *udev)
+{
+ int err;
+
+ if (udev->config == NULL) {
+ err = usb_get_configuration(udev);
+ if (err < 0) {
+ dev_err(&udev->dev, "can't read configurations, error %d\n",
+ err);
+ goto fail;
+ }
+ }
+ if (udev->wusb == 1 && udev->authorized == 0) {
+ udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
+ udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
+ udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
+ }
+ else {
+ /* read the standard strings and cache them if present */
+ udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
+ udev->manufacturer = usb_cache_string(udev,
+ udev->descriptor.iManufacturer);
+ udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
+ }
+ err = usb_configure_device_otg(udev);
+fail:
+ return err;
+}
+
+
+/**
+ * usb_new_device - perform initial device setup (usbcore-internal)
+ * @udev: newly addressed device (in ADDRESS state)
+ *
+ * This is called with devices which have been enumerated, but not yet
+ * configured. The device descriptor is available, but not descriptors
+ * for any device configuration. The caller must have locked either
+ * the parent hub (if udev is a normal device) or else the
+ * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
+ * udev has already been installed, but udev is not yet visible through
+ * sysfs or other filesystem code.
+ *
+ * It will return if the device is configured properly or not. Zero if
+ * the interface was registered with the driver core; else a negative
+ * errno value.
+ *
+ * This call is synchronous, and may not be used in an interrupt context.
+ *
+ * Only the hub driver or root-hub registrar should ever call this.
+ */
+int usb_new_device(struct usb_device *udev)
+{
+ int err;
+ usb_detect_quirks(udev); /* Determine quirks */
+ err = usb_configure_device(udev); /* detect & probe dev/intfs */
+ if (err < 0)
+ goto fail;
/* export the usbdev device-node for libusb */
udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
(((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
+ /* Increment the parent's count of unsuspended children */
+ if (udev->parent)
+ usb_autoresume_device(udev->parent);
+
/* Register the device. The device driver is responsible
* for adding the device files to sysfs and for configuring
* the device.
goto fail;
}
- /* Increment the parent's count of unsuspended children */
- if (udev->parent)
- usb_autoresume_device(udev->parent);
-
-exit:
+ /* Tell the world! */
+ dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
+ "SerialNumber=%d\n",
+ udev->descriptor.iManufacturer,
+ udev->descriptor.iProduct,
+ udev->descriptor.iSerialNumber);
+ show_string(udev, "Product", udev->product);
+ show_string(udev, "Manufacturer", udev->manufacturer);
+ show_string(udev, "SerialNumber", udev->serial);
return err;
fail:
usb_set_device_state(udev, USB_STATE_NOTATTACHED);
- goto exit;
+ return err;
}
+
+/**
+ * usb_deauthorize_device - deauthorize a device (usbcore-internal)
+ * @usb_dev: USB device
+ *
+ * Move the USB device to a very basic state where interfaces are disabled
+ * and the device is in fact unconfigured and unusable.
+ *
+ * We share a lock (that we have) with device_del(), so we need to
+ * defer its call.
+ */
+int usb_deauthorize_device(struct usb_device *usb_dev)
+{
+ unsigned cnt;
+ usb_lock_device(usb_dev);
+ if (usb_dev->authorized == 0)
+ goto out_unauthorized;
+ usb_dev->authorized = 0;
+ usb_set_configuration(usb_dev, -1);
+ usb_dev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
+ usb_dev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
+ usb_dev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
+ kfree(usb_dev->config);
+ usb_dev->config = NULL;
+ for (cnt = 0; cnt < usb_dev->descriptor.bNumConfigurations; cnt++)
+ kfree(usb_dev->rawdescriptors[cnt]);
+ usb_dev->descriptor.bNumConfigurations = 0;
+ kfree(usb_dev->rawdescriptors);
+out_unauthorized:
+ usb_unlock_device(usb_dev);
+ return 0;
+}
+
+
+int usb_authorize_device(struct usb_device *usb_dev)
+{
+ int result = 0, c;
+ usb_lock_device(usb_dev);
+ if (usb_dev->authorized == 1)
+ goto out_authorized;
+ kfree(usb_dev->product);
+ usb_dev->product = NULL;
+ kfree(usb_dev->manufacturer);
+ usb_dev->manufacturer = NULL;
+ kfree(usb_dev->serial);
+ usb_dev->serial = NULL;
+ result = usb_autoresume_device(usb_dev);
+ if (result < 0) {
+ dev_err(&usb_dev->dev,
+ "can't autoresume for authorization: %d\n", result);
+ goto error_autoresume;
+ }
+ result = usb_get_device_descriptor(usb_dev, sizeof(usb_dev->descriptor));
+ if (result < 0) {
+ dev_err(&usb_dev->dev, "can't re-read device descriptor for "
+ "authorization: %d\n", result);
+ goto error_device_descriptor;
+ }
+ usb_dev->authorized = 1;
+ result = usb_configure_device(usb_dev);
+ if (result < 0)
+ goto error_configure;
+ /* Choose and set the configuration. This registers the interfaces
+ * with the driver core and lets interface drivers bind to them.
+ */
+ c = usb_choose_configuration(usb_dev);
+ if (c >= 0) {
+ result = usb_set_configuration(usb_dev, c);
+ if (result) {
+ dev_err(&usb_dev->dev,
+ "can't set config #%d, error %d\n", c, result);
+ /* This need not be fatal. The user can try to
+ * set other configurations. */
+ }
+ }
+ dev_info(&usb_dev->dev, "authorized to connect\n");
+error_configure:
+error_device_descriptor:
+error_autoresume:
+out_authorized:
+ usb_unlock_device(usb_dev); // complements locktree
+ return result;
+}
+
+
static int hub_port_status(struct usb_hub *hub, int port1,
u16 *status, u16 *change)
{
if (!(portstatus & USB_PORT_STAT_CONNECTION))
return -ENOTCONN;
- /* bomb out completely if something weird happened */
+ /* bomb out completely if the connection bounced */
if ((portchange & USB_PORT_STAT_C_CONNECTION))
- return -EINVAL;
+ return -ENOTCONN;
/* if we`ve finished resetting, then break out of the loop */
if (!(portstatus & USB_PORT_STAT_RESET) &&
{
int i, status;
+ /* Block EHCI CF initialization during the port reset.
+ * Some companion controllers don't like it when they mix.
+ */
+ down_read(&ehci_cf_port_reset_rwsem);
+
/* Reset the port */
for (i = 0; i < PORT_RESET_TRIES; i++) {
status = set_port_feature(hub->hdev,
case 0:
/* TRSTRCY = 10 ms; plus some extra */
msleep(10 + 40);
+ udev->devnum = 0; /* Device now at address 0 */
/* FALL THROUGH */
case -ENOTCONN:
case -ENODEV:
usb_set_device_state(udev, status
? USB_STATE_NOTATTACHED
: USB_STATE_DEFAULT);
- return status;
+ goto done;
}
dev_dbg (hub->intfdev,
"Cannot enable port %i. Maybe the USB cable is bad?\n",
port1);
+ done:
+ up_read(&ehci_cf_port_reset_rwsem);
return status;
}
-/*
- * Disable a port and mark a logical connnect-change event, so that some
- * time later khubd will disconnect() any existing usb_device on the port
- * and will re-enumerate if there actually is a device attached.
- */
-static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
-{
- dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
- hub_port_disable(hub, port1, 1);
-
- /* FIXME let caller ask to power down the port:
- * - some devices won't enumerate without a VBUS power cycle
- * - SRP saves power that way
- * - ... new call, TBD ...
- * That's easy if this hub can switch power per-port, and
- * khubd reactivates the port later (timer, SRP, etc).
- * Powerdown must be optional, because of reset/DFU.
- */
-
- set_bit(port1, hub->change_bits);
- kick_khubd(hub);
-}
-
#ifdef CONFIG_PM
#ifdef CONFIG_USB_SUSPEND
/*
+ * usb_port_suspend - suspend a usb device's upstream port
+ * @udev: device that's no longer in active use, not a root hub
+ * Context: must be able to sleep; device not locked; pm locks held
+ *
+ * Suspends a USB device that isn't in active use, conserving power.
+ * Devices may wake out of a suspend, if anything important happens,
+ * using the remote wakeup mechanism. They may also be taken out of
+ * suspend by the host, using usb_port_resume(). It's also routine
+ * to disconnect devices while they are suspended.
+ *
+ * This only affects the USB hardware for a device; its interfaces
+ * (and, for hubs, child devices) must already have been suspended.
+ *
* Selective port suspend reduces power; most suspended devices draw
* less than 500 uA. It's also used in OTG, along with remote wakeup.
* All devices below the suspended port are also suspended.
* also support "remote wakeup", where the device can activate the USB
* tree above them to deliver data, such as a keypress or packet. In
* some cases, this wakes the USB host.
+ *
+ * Suspending OTG devices may trigger HNP, if that's been enabled
+ * between a pair of dual-role devices. That will change roles, such
+ * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
+ *
+ * Devices on USB hub ports have only one "suspend" state, corresponding
+ * to ACPI D2, "may cause the device to lose some context".
+ * State transitions include:
+ *
+ * - suspend, resume ... when the VBUS power link stays live
+ * - suspend, disconnect ... VBUS lost
+ *
+ * Once VBUS drop breaks the circuit, the port it's using has to go through
+ * normal re-enumeration procedures, starting with enabling VBUS power.
+ * Other than re-initializing the hub (plug/unplug, except for root hubs),
+ * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
+ * timer, no SRP, no requests through sysfs.
+ *
+ * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
+ * the root hub for their bus goes into global suspend ... so we don't
+ * (falsely) update the device power state to say it suspended.
+ *
+ * Returns 0 on success, else negative errno.
*/
-static int hub_port_suspend(struct usb_hub *hub, int port1,
- struct usb_device *udev)
+int usb_port_suspend(struct usb_device *udev)
{
- int status;
+ struct usb_hub *hub = hdev_to_hub(udev->parent);
+ int port1 = udev->portnum;
+ int status;
// dev_dbg(hub->intfdev, "suspend port %d\n", port1);
NULL, 0,
USB_CTRL_SET_TIMEOUT);
if (status)
- dev_dbg(&udev->dev,
- "won't remote wakeup, status %d\n",
- status);
+ dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
+ status);
}
/* see 7.1.7.6 */
status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
if (status) {
- dev_dbg(hub->intfdev,
- "can't suspend port %d, status %d\n",
- port1, status);
+ dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",
+ port1, status);
/* paranoia: "should not happen" */
(void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
}
/*
- * Devices on USB hub ports have only one "suspend" state, corresponding
- * to ACPI D2, "may cause the device to lose some context".
- * State transitions include:
- *
- * - suspend, resume ... when the VBUS power link stays live
- * - suspend, disconnect ... VBUS lost
- *
- * Once VBUS drop breaks the circuit, the port it's using has to go through
- * normal re-enumeration procedures, starting with enabling VBUS power.
- * Other than re-initializing the hub (plug/unplug, except for root hubs),
- * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
- * timer, no SRP, no requests through sysfs.
- *
- * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
- * the root hub for their bus goes into global suspend ... so we don't
- * (falsely) update the device power state to say it suspended.
- */
-static int __usb_port_suspend (struct usb_device *udev, int port1)
-{
- int status = 0;
-
- /* caller owns the udev device lock */
- if (port1 < 0)
- return port1;
-
- /* we change the device's upstream USB link,
- * but root hubs have no upstream USB link.
- */
- if (udev->parent)
- status = hub_port_suspend(hdev_to_hub(udev->parent), port1,
- udev);
- else {
- dev_dbg(&udev->dev, "usb %ssuspend\n",
- udev->auto_pm ? "auto-" : "");
- usb_set_device_state(udev, USB_STATE_SUSPENDED);
- }
- return status;
-}
-
-/*
- * usb_port_suspend - suspend a usb device's upstream port
- * @udev: device that's no longer in active use
- * Context: must be able to sleep; device not locked; pm locks held
- *
- * Suspends a USB device that isn't in active use, conserving power.
- * Devices may wake out of a suspend, if anything important happens,
- * using the remote wakeup mechanism. They may also be taken out of
- * suspend by the host, using usb_port_resume(). It's also routine
- * to disconnect devices while they are suspended.
- *
- * This only affects the USB hardware for a device; its interfaces
- * (and, for hubs, child devices) must already have been suspended.
- *
- * Suspending OTG devices may trigger HNP, if that's been enabled
- * between a pair of dual-role devices. That will change roles, such
- * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
- *
- * Returns 0 on success, else negative errno.
- */
-int usb_port_suspend(struct usb_device *udev)
-{
- return __usb_port_suspend(udev, udev->portnum);
-}
-
-/*
* If the USB "suspend" state is in use (rather than "global suspend"),
* many devices will be individually taken out of suspend state using
- * special" resume" signaling. These routines kick in shortly after
+ * special "resume" signaling. This routine kicks in shortly after
* hardware resume signaling is finished, either because of selective
* resume (by host) or remote wakeup (by device) ... now see what changed
* in the tree that's rooted at this device.
+ *
+ * If @udev->reset_resume is set then the device is reset before the
+ * status check is done.
*/
static int finish_port_resume(struct usb_device *udev)
{
- int status;
+ int status = 0;
u16 devstatus;
/* caller owns the udev device lock */
- dev_dbg(&udev->dev, "finish resume\n");
+ dev_dbg(&udev->dev, "finish %sresume\n",
+ udev->reset_resume ? "reset-" : "");
/* usb ch9 identifies four variants of SUSPENDED, based on what
* state the device resumes to. Linux currently won't see the
? USB_STATE_CONFIGURED
: USB_STATE_ADDRESS);
+ /* 10.5.4.5 says not to reset a suspended port if the attached
+ * device is enabled for remote wakeup. Hence the reset
+ * operation is carried out here, after the port has been
+ * resumed.
+ */
+ if (udev->reset_resume)
+ status = usb_reset_device(udev);
+
/* 10.5.4.5 says be sure devices in the tree are still there.
* For now let's assume the device didn't go crazy on resume,
* and device drivers will know about any resume quirks.
*/
- status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
- if (status >= 0)
- status = (status == 2 ? 0 : -ENODEV);
+ if (status == 0) {
+ devstatus = 0;
+ status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
+ if (status >= 0)
+ status = (status > 0 ? 0 : -ENODEV);
+ }
- if (status)
- dev_dbg(&udev->dev,
- "gone after usb resume? status %d\n",
- status);
- else if (udev->actconfig) {
+ if (status) {
+ dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
+ status);
+ } else if (udev->actconfig) {
le16_to_cpus(&devstatus);
- if ((devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP))
- && udev->parent) {
+ if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
status = usb_control_msg(udev,
usb_sndctrlpipe(udev, 0),
USB_REQ_CLEAR_FEATURE,
"wakeup, status %d\n", status);
}
status = 0;
-
- } else if (udev->devnum <= 0) {
- dev_dbg(&udev->dev, "bogus resume!\n");
- status = -EINVAL;
}
return status;
}
-static int
-hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
+/*
+ * usb_port_resume - re-activate a suspended usb device's upstream port
+ * @udev: device to re-activate, not a root hub
+ * Context: must be able to sleep; device not locked; pm locks held
+ *
+ * This will re-activate the suspended device, increasing power usage
+ * while letting drivers communicate again with its endpoints.
+ * USB resume explicitly guarantees that the power session between
+ * the host and the device is the same as it was when the device
+ * suspended.
+ *
+ * If CONFIG_USB_PERSIST and @udev->reset_resume are both set then this
+ * routine won't check that the port is still enabled. Furthermore,
+ * if @udev->reset_resume is set then finish_port_resume() above will
+ * reset @udev. The end result is that a broken power session can be
+ * recovered and @udev will appear to persist across a loss of VBUS power.
+ *
+ * For example, if a host controller doesn't maintain VBUS suspend current
+ * during a system sleep or is reset when the system wakes up, all the USB
+ * power sessions below it will be broken. This is especially troublesome
+ * for mass-storage devices containing mounted filesystems, since the
+ * device will appear to have disconnected and all the memory mappings
+ * to it will be lost. Using the USB_PERSIST facility, the device can be
+ * made to appear as if it had not disconnected.
+ *
+ * This facility is inherently dangerous. Although usb_reset_device()
+ * makes every effort to insure that the same device is present after the
+ * reset as before, it cannot provide a 100% guarantee. Furthermore it's
+ * quite possible for a device to remain unaltered but its media to be
+ * changed. If the user replaces a flash memory card while the system is
+ * asleep, he will have only himself to blame when the filesystem on the
+ * new card is corrupted and the system crashes.
+ *
+ * Returns 0 on success, else negative errno.
+ */
+int usb_port_resume(struct usb_device *udev)
{
- int status;
- u16 portchange, portstatus;
+ struct usb_hub *hub = hdev_to_hub(udev->parent);
+ int port1 = udev->portnum;
+ int status;
+ u16 portchange, portstatus;
+ unsigned mask_flags, want_flags;
/* Skip the initial Clear-Suspend step for a remote wakeup */
status = hub_port_status(hub, port1, &portstatus, &portchange);
status = clear_port_feature(hub->hdev,
port1, USB_PORT_FEAT_SUSPEND);
if (status) {
- dev_dbg(hub->intfdev,
- "can't resume port %d, status %d\n",
- port1, status);
+ dev_dbg(hub->intfdev, "can't resume port %d, status %d\n",
+ port1, status);
} else {
/* drive resume for at least 20 msec */
- if (udev)
- dev_dbg(&udev->dev, "usb %sresume\n",
- udev->auto_pm ? "auto-" : "");
+ dev_dbg(&udev->dev, "usb %sresume\n",
+ udev->auto_pm ? "auto-" : "");
msleep(25);
-#define LIVE_FLAGS ( USB_PORT_STAT_POWER \
- | USB_PORT_STAT_ENABLE \
- | USB_PORT_STAT_CONNECTION)
-
/* Virtual root hubs can trigger on GET_PORT_STATUS to
* stop resume signaling. Then finish the resume
* sequence.
*/
status = hub_port_status(hub, port1, &portstatus, &portchange);
-SuspendCleared:
- if (status < 0
- || (portstatus & LIVE_FLAGS) != LIVE_FLAGS
- || (portstatus & USB_PORT_STAT_SUSPEND) != 0
- ) {
+
+ SuspendCleared:
+ if (USB_PERSIST && udev->reset_resume)
+ want_flags = USB_PORT_STAT_POWER
+ | USB_PORT_STAT_CONNECTION;
+ else
+ want_flags = USB_PORT_STAT_POWER
+ | USB_PORT_STAT_CONNECTION
+ | USB_PORT_STAT_ENABLE;
+ mask_flags = want_flags | USB_PORT_STAT_SUSPEND;
+
+ if (status < 0 || (portstatus & mask_flags) != want_flags) {
dev_dbg(hub->intfdev,
"port %d status %04x.%04x after resume, %d\n",
port1, portchange, portstatus, status);
USB_PORT_FEAT_C_SUSPEND);
/* TRSMRCY = 10 msec */
msleep(10);
- if (udev)
- status = finish_port_resume(udev);
}
}
- if (status < 0)
- hub_port_logical_disconnect(hub, port1);
clear_bit(port1, hub->busy_bits);
if (!hub->hdev->parent && !hub->busy_bits[0])
usb_enable_root_hub_irq(hub->hdev->bus);
- return status;
-}
-
-/*
- * usb_port_resume - re-activate a suspended usb device's upstream port
- * @udev: device to re-activate
- * Context: must be able to sleep; device not locked; pm locks held
- *
- * This will re-activate the suspended device, increasing power usage
- * while letting drivers communicate again with its endpoints.
- * USB resume explicitly guarantees that the power session between
- * the host and the device is the same as it was when the device
- * suspended.
- *
- * Returns 0 on success, else negative errno.
- */
-int usb_port_resume(struct usb_device *udev)
-{
- int status;
-
- /* we change the device's upstream USB link,
- * but root hubs have no upstream USB link.
- */
- if (udev->parent) {
- // NOTE this fails if parent is also suspended...
- status = hub_port_resume(hdev_to_hub(udev->parent),
- udev->portnum, udev);
- } else {
- dev_dbg(&udev->dev, "usb %sresume\n",
- udev->auto_pm ? "auto-" : "");
+ if (status == 0)
status = finish_port_resume(udev);
- }
- if (status < 0)
+ if (status < 0) {
dev_dbg(&udev->dev, "can't resume, status %d\n", status);
+ hub_port_logical_disconnect(hub, port1);
+ }
return status;
}
return 0;
}
-static inline int
-finish_port_resume(struct usb_device *udev)
-{
- return 0;
-}
-
-static inline int
-hub_port_resume(struct usb_hub *hub, int port1, struct usb_device *udev)
-{
- return 0;
-}
-
int usb_port_resume(struct usb_device *udev)
{
- return 0;
+ int status = 0;
+
+ /* However we may need to do a reset-resume */
+ if (udev->reset_resume) {
+ dev_dbg(&udev->dev, "reset-resume\n");
+ status = usb_reset_device(udev);
+ }
+ return status;
}
static inline int remote_wakeup(struct usb_device *udev)
struct usb_device *udev;
udev = hdev->children [port1-1];
- if (udev && msg.event == PM_EVENT_SUSPEND &&
-#ifdef CONFIG_USB_SUSPEND
- udev->state != USB_STATE_SUSPENDED
-#else
- udev->dev.power.power_state.event
- == PM_EVENT_ON
-#endif
- ) {
+ if (udev && udev->can_submit) {
if (!hdev->auto_pm)
dev_dbg(&intf->dev, "port %d nyet suspended\n",
port1);
return 0;
}
+static int hub_reset_resume(struct usb_interface *intf)
+{
+ struct usb_hub *hub = usb_get_intfdata(intf);
+ struct usb_device *hdev = hub->hdev;
+ int port1;
+
+ hub_power_on(hub);
+
+ for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
+ struct usb_device *child = hdev->children[port1-1];
+
+ if (child) {
+
+ /* For "USB_PERSIST"-enabled children we must
+ * mark the child device for reset-resume and
+ * turn off the connect-change status to prevent
+ * khubd from disconnecting it later.
+ */
+ if (USB_PERSIST && child->persist_enabled) {
+ child->reset_resume = 1;
+ clear_port_feature(hdev, port1,
+ USB_PORT_FEAT_C_CONNECTION);
+
+ /* Otherwise we must disconnect the child,
+ * but as we may not lock the child device here
+ * we have to do a "logical" disconnect.
+ */
+ } else {
+ hub_port_logical_disconnect(hub, port1);
+ }
+ }
+ }
+
+ hub_activate(hub);
+ return 0;
+}
+
+/**
+ * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
+ * @rhdev: struct usb_device for the root hub
+ *
+ * The USB host controller driver calls this function when its root hub
+ * is resumed and Vbus power has been interrupted or the controller
+ * has been reset. The routine marks @rhdev as having lost power. When
+ * the hub driver is resumed it will take notice; if CONFIG_USB_PERSIST
+ * is enabled then it will carry out power-session recovery, otherwise
+ * it will disconnect all the child devices.
+ */
+void usb_root_hub_lost_power(struct usb_device *rhdev)
+{
+ dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
+ rhdev->reset_resume = 1;
+}
+EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
+
#else /* CONFIG_PM */
static inline int remote_wakeup(struct usb_device *udev)
return 0;
}
-#define hub_suspend NULL
-#define hub_resume NULL
+#define hub_suspend NULL
+#define hub_resume NULL
+#define hub_reset_resume NULL
#endif
{
usb_disable_endpoint(udev, 0 + USB_DIR_IN);
usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
- udev->ep_in[0] = udev->ep_out[0] = &udev->ep0;
+ usb_enable_endpoint(udev, &udev->ep0);
}
#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
-static int hub_set_address(struct usb_device *udev)
+static int hub_set_address(struct usb_device *udev, int devnum)
{
int retval;
- if (udev->devnum == 0)
+ if (devnum <= 1)
return -EINVAL;
if (udev->state == USB_STATE_ADDRESS)
return 0;
if (udev->state != USB_STATE_DEFAULT)
return -EINVAL;
retval = usb_control_msg(udev, usb_sndaddr0pipe(),
- USB_REQ_SET_ADDRESS, 0, udev->devnum, 0,
+ USB_REQ_SET_ADDRESS, 0, devnum, 0,
NULL, 0, USB_CTRL_SET_TIMEOUT);
if (retval == 0) {
+ udev->devnum = devnum; /* Device now using proper address */
usb_set_device_state(udev, USB_STATE_ADDRESS);
ep0_reinit(udev);
}
unsigned delay = HUB_SHORT_RESET_TIME;
enum usb_device_speed oldspeed = udev->speed;
char *speed, *type;
+ int devnum = udev->devnum;
/* root hub ports have a slightly longer reset period
* (from USB 2.0 spec, section 7.1.7.5)
goto fail;
}
oldspeed = udev->speed;
-
+
/* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
* it's fixed size except for full speed devices.
* For Wireless USB devices, ep0 max packet is always 512 (tho
dev_info (&udev->dev,
"%s %s speed %sUSB device using %s and address %d\n",
(udev->config) ? "reset" : "new", speed, type,
- udev->bus->controller->driver->name, udev->devnum);
+ udev->bus->controller->driver->name, devnum);
/* Set up TT records, if needed */
if (hdev->tt) {
}
for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
- retval = hub_set_address(udev);
+ retval = hub_set_address(udev, devnum);
if (retval >= 0)
break;
msleep(200);
if (retval < 0) {
dev_err(&udev->dev,
"device not accepting address %d, error %d\n",
- udev->devnum, retval);
+ devnum, retval);
goto fail;
}
retval = 0;
fail:
- if (retval)
+ if (retval) {
hub_port_disable(hub, port1, 0);
+ udev->devnum = devnum; /* for disconnect processing */
+ }
mutex_unlock(&usb_address0_mutex);
return retval;
}
ep0_reinit(udev);
release_address(udev);
usb_put_dev(udev);
- if (status == -ENOTCONN)
+ if ((status == -ENOTCONN) || (status == -ENOTSUPP))
break;
}
clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
if (hubstatus & HUB_STATUS_LOCAL_POWER)
/* FIXME: Is this always true? */
- hub->limited_power = 0;
- else
hub->limited_power = 1;
+ else
+ hub->limited_power = 0;
}
if (hubchange & HUB_CHANGE_OVERCURRENT) {
dev_dbg (hub_dev, "overcurrent change\n");
static int hub_thread(void *__unused)
{
+ set_freezable();
do {
hub_events();
- wait_event_interruptible(khubd_wait,
+ wait_event_freezable(khubd_wait,
!list_empty(&hub_event_list) ||
kthread_should_stop());
- try_to_freeze();
} while (!kthread_should_stop() || !list_empty(&hub_event_list));
pr_debug("%s: khubd exiting\n", usbcore_name);
.disconnect = hub_disconnect,
.suspend = hub_suspend,
.resume = hub_resume,
+ .reset_resume = hub_reset_resume,
.pre_reset = hub_pre_reset,
.post_reset = hub_post_reset,
.ioctl = hub_ioctl,
* this from a driver probe() routine after downloading new firmware.
* For calls that might not occur during probe(), drivers should lock
* the device using usb_lock_device_for_reset().
+ *
+ * Locking exception: This routine may also be called from within an
+ * autoresume handler. Such usage won't conflict with other tasks
+ * holding the device lock because these tasks should always call
+ * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
*/
int usb_reset_device(struct usb_device *udev)
{
* Other endpoints will be handled by re-enumeration. */
ep0_reinit(udev);
ret = hub_port_init(parent_hub, udev, port1, i);
- if (ret >= 0)
+ if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
break;
}
clear_bit(port1, parent_hub->busy_bits);
drv = to_usb_driver(cintf->dev.driver);
if (drv->pre_reset)
(drv->pre_reset)(cintf);
+ /* FIXME: Unbind if pre_reset returns an error or isn't defined */
}
}
}
drv = to_usb_driver(cintf->dev.driver);
if (drv->post_reset)
(drv->post_reset)(cintf);
+ /* FIXME: Unbind if post_reset returns an error or isn't defined */
}
if (cintf != iface)
up(&cintf->dev.sem);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff