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2035 lines
58 KiB
2035 lines
58 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* drivers/usb/driver.c - most of the driver model stuff for usb |
|
* |
|
* (C) Copyright 2005 Greg Kroah-Hartman <[email protected]> |
|
* |
|
* based on drivers/usb/usb.c which had the following copyrights: |
|
* (C) Copyright Linus Torvalds 1999 |
|
* (C) Copyright Johannes Erdfelt 1999-2001 |
|
* (C) Copyright Andreas Gal 1999 |
|
* (C) Copyright Gregory P. Smith 1999 |
|
* (C) Copyright Deti Fliegl 1999 (new USB architecture) |
|
* (C) Copyright Randy Dunlap 2000 |
|
* (C) Copyright David Brownell 2000-2004 |
|
* (C) Copyright Yggdrasil Computing, Inc. 2000 |
|
* (usb_device_id matching changes by Adam J. Richter) |
|
* (C) Copyright Greg Kroah-Hartman 2002-2003 |
|
* |
|
* Released under the GPLv2 only. |
|
* |
|
* NOTE! This is not actually a driver at all, rather this is |
|
* just a collection of helper routines that implement the |
|
* matching, probing, releasing, suspending and resuming for |
|
* real drivers. |
|
* |
|
*/ |
|
|
|
#include <linux/device.h> |
|
#include <linux/slab.h> |
|
#include <linux/export.h> |
|
#include <linux/usb.h> |
|
#include <linux/usb/quirks.h> |
|
#include <linux/usb/hcd.h> |
|
|
|
#include "usb.h" |
|
|
|
|
|
/* |
|
* Adds a new dynamic USBdevice ID to this driver, |
|
* and cause the driver to probe for all devices again. |
|
*/ |
|
ssize_t usb_store_new_id(struct usb_dynids *dynids, |
|
const struct usb_device_id *id_table, |
|
struct device_driver *driver, |
|
const char *buf, size_t count) |
|
{ |
|
struct usb_dynid *dynid; |
|
u32 idVendor = 0; |
|
u32 idProduct = 0; |
|
unsigned int bInterfaceClass = 0; |
|
u32 refVendor, refProduct; |
|
int fields = 0; |
|
int retval = 0; |
|
|
|
fields = sscanf(buf, "%x %x %x %x %x", &idVendor, &idProduct, |
|
&bInterfaceClass, &refVendor, &refProduct); |
|
if (fields < 2) |
|
return -EINVAL; |
|
|
|
dynid = kzalloc(sizeof(*dynid), GFP_KERNEL); |
|
if (!dynid) |
|
return -ENOMEM; |
|
|
|
INIT_LIST_HEAD(&dynid->node); |
|
dynid->id.idVendor = idVendor; |
|
dynid->id.idProduct = idProduct; |
|
dynid->id.match_flags = USB_DEVICE_ID_MATCH_DEVICE; |
|
if (fields > 2 && bInterfaceClass) { |
|
if (bInterfaceClass > 255) { |
|
retval = -EINVAL; |
|
goto fail; |
|
} |
|
|
|
dynid->id.bInterfaceClass = (u8)bInterfaceClass; |
|
dynid->id.match_flags |= USB_DEVICE_ID_MATCH_INT_CLASS; |
|
} |
|
|
|
if (fields > 4) { |
|
const struct usb_device_id *id = id_table; |
|
|
|
if (!id) { |
|
retval = -ENODEV; |
|
goto fail; |
|
} |
|
|
|
for (; id->match_flags; id++) |
|
if (id->idVendor == refVendor && id->idProduct == refProduct) |
|
break; |
|
|
|
if (id->match_flags) { |
|
dynid->id.driver_info = id->driver_info; |
|
} else { |
|
retval = -ENODEV; |
|
goto fail; |
|
} |
|
} |
|
|
|
spin_lock(&dynids->lock); |
|
list_add_tail(&dynid->node, &dynids->list); |
|
spin_unlock(&dynids->lock); |
|
|
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retval = driver_attach(driver); |
|
|
|
if (retval) |
|
return retval; |
|
return count; |
|
|
|
fail: |
|
kfree(dynid); |
|
return retval; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_store_new_id); |
|
|
|
ssize_t usb_show_dynids(struct usb_dynids *dynids, char *buf) |
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{ |
|
struct usb_dynid *dynid; |
|
size_t count = 0; |
|
|
|
list_for_each_entry(dynid, &dynids->list, node) |
|
if (dynid->id.bInterfaceClass != 0) |
|
count += scnprintf(&buf[count], PAGE_SIZE - count, "%04x %04x %02x\n", |
|
dynid->id.idVendor, dynid->id.idProduct, |
|
dynid->id.bInterfaceClass); |
|
else |
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count += scnprintf(&buf[count], PAGE_SIZE - count, "%04x %04x\n", |
|
dynid->id.idVendor, dynid->id.idProduct); |
|
return count; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_show_dynids); |
|
|
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static ssize_t new_id_show(struct device_driver *driver, char *buf) |
|
{ |
|
struct usb_driver *usb_drv = to_usb_driver(driver); |
|
|
|
return usb_show_dynids(&usb_drv->dynids, buf); |
|
} |
|
|
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static ssize_t new_id_store(struct device_driver *driver, |
|
const char *buf, size_t count) |
|
{ |
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struct usb_driver *usb_drv = to_usb_driver(driver); |
|
|
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return usb_store_new_id(&usb_drv->dynids, usb_drv->id_table, driver, buf, count); |
|
} |
|
static DRIVER_ATTR_RW(new_id); |
|
|
|
/* |
|
* Remove a USB device ID from this driver |
|
*/ |
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static ssize_t remove_id_store(struct device_driver *driver, const char *buf, |
|
size_t count) |
|
{ |
|
struct usb_dynid *dynid, *n; |
|
struct usb_driver *usb_driver = to_usb_driver(driver); |
|
u32 idVendor; |
|
u32 idProduct; |
|
int fields; |
|
|
|
fields = sscanf(buf, "%x %x", &idVendor, &idProduct); |
|
if (fields < 2) |
|
return -EINVAL; |
|
|
|
spin_lock(&usb_driver->dynids.lock); |
|
list_for_each_entry_safe(dynid, n, &usb_driver->dynids.list, node) { |
|
struct usb_device_id *id = &dynid->id; |
|
|
|
if ((id->idVendor == idVendor) && |
|
(id->idProduct == idProduct)) { |
|
list_del(&dynid->node); |
|
kfree(dynid); |
|
break; |
|
} |
|
} |
|
spin_unlock(&usb_driver->dynids.lock); |
|
return count; |
|
} |
|
|
|
static ssize_t remove_id_show(struct device_driver *driver, char *buf) |
|
{ |
|
return new_id_show(driver, buf); |
|
} |
|
static DRIVER_ATTR_RW(remove_id); |
|
|
|
static int usb_create_newid_files(struct usb_driver *usb_drv) |
|
{ |
|
int error = 0; |
|
|
|
if (usb_drv->no_dynamic_id) |
|
goto exit; |
|
|
|
if (usb_drv->probe != NULL) { |
|
error = driver_create_file(&usb_drv->drvwrap.driver, |
|
&driver_attr_new_id); |
|
if (error == 0) { |
|
error = driver_create_file(&usb_drv->drvwrap.driver, |
|
&driver_attr_remove_id); |
|
if (error) |
|
driver_remove_file(&usb_drv->drvwrap.driver, |
|
&driver_attr_new_id); |
|
} |
|
} |
|
exit: |
|
return error; |
|
} |
|
|
|
static void usb_remove_newid_files(struct usb_driver *usb_drv) |
|
{ |
|
if (usb_drv->no_dynamic_id) |
|
return; |
|
|
|
if (usb_drv->probe != NULL) { |
|
driver_remove_file(&usb_drv->drvwrap.driver, |
|
&driver_attr_remove_id); |
|
driver_remove_file(&usb_drv->drvwrap.driver, |
|
&driver_attr_new_id); |
|
} |
|
} |
|
|
|
static void usb_free_dynids(struct usb_driver *usb_drv) |
|
{ |
|
struct usb_dynid *dynid, *n; |
|
|
|
spin_lock(&usb_drv->dynids.lock); |
|
list_for_each_entry_safe(dynid, n, &usb_drv->dynids.list, node) { |
|
list_del(&dynid->node); |
|
kfree(dynid); |
|
} |
|
spin_unlock(&usb_drv->dynids.lock); |
|
} |
|
|
|
static const struct usb_device_id *usb_match_dynamic_id(struct usb_interface *intf, |
|
struct usb_driver *drv) |
|
{ |
|
struct usb_dynid *dynid; |
|
|
|
spin_lock(&drv->dynids.lock); |
|
list_for_each_entry(dynid, &drv->dynids.list, node) { |
|
if (usb_match_one_id(intf, &dynid->id)) { |
|
spin_unlock(&drv->dynids.lock); |
|
return &dynid->id; |
|
} |
|
} |
|
spin_unlock(&drv->dynids.lock); |
|
return NULL; |
|
} |
|
|
|
|
|
/* called from driver core with dev locked */ |
|
static int usb_probe_device(struct device *dev) |
|
{ |
|
struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); |
|
struct usb_device *udev = to_usb_device(dev); |
|
int error = 0; |
|
|
|
dev_dbg(dev, "%s\n", __func__); |
|
|
|
/* TODO: Add real matching code */ |
|
|
|
/* The device should always appear to be in use |
|
* unless the driver supports autosuspend. |
|
*/ |
|
if (!udriver->supports_autosuspend) |
|
error = usb_autoresume_device(udev); |
|
if (error) |
|
return error; |
|
|
|
if (udriver->generic_subclass) |
|
error = usb_generic_driver_probe(udev); |
|
if (error) |
|
return error; |
|
|
|
/* Probe the USB device with the driver in hand, but only |
|
* defer to a generic driver in case the current USB |
|
* device driver has an id_table or a match function; i.e., |
|
* when the device driver was explicitly matched against |
|
* a device. |
|
* |
|
* If the device driver does not have either of these, |
|
* then we assume that it can bind to any device and is |
|
* not truly a more specialized/non-generic driver, so a |
|
* return value of -ENODEV should not force the device |
|
* to be handled by the generic USB driver, as there |
|
* can still be another, more specialized, device driver. |
|
* |
|
* This accommodates the usbip driver. |
|
* |
|
* TODO: What if, in the future, there are multiple |
|
* specialized USB device drivers for a particular device? |
|
* In such cases, there is a need to try all matching |
|
* specialised device drivers prior to setting the |
|
* use_generic_driver bit. |
|
*/ |
|
error = udriver->probe(udev); |
|
if (error == -ENODEV && udriver != &usb_generic_driver && |
|
(udriver->id_table || udriver->match)) { |
|
udev->use_generic_driver = 1; |
|
return -EPROBE_DEFER; |
|
} |
|
return error; |
|
} |
|
|
|
/* called from driver core with dev locked */ |
|
static int usb_unbind_device(struct device *dev) |
|
{ |
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struct usb_device *udev = to_usb_device(dev); |
|
struct usb_device_driver *udriver = to_usb_device_driver(dev->driver); |
|
|
|
if (udriver->disconnect) |
|
udriver->disconnect(udev); |
|
if (udriver->generic_subclass) |
|
usb_generic_driver_disconnect(udev); |
|
if (!udriver->supports_autosuspend) |
|
usb_autosuspend_device(udev); |
|
return 0; |
|
} |
|
|
|
/* called from driver core with dev locked */ |
|
static int usb_probe_interface(struct device *dev) |
|
{ |
|
struct usb_driver *driver = to_usb_driver(dev->driver); |
|
struct usb_interface *intf = to_usb_interface(dev); |
|
struct usb_device *udev = interface_to_usbdev(intf); |
|
const struct usb_device_id *id; |
|
int error = -ENODEV; |
|
int lpm_disable_error = -ENODEV; |
|
|
|
dev_dbg(dev, "%s\n", __func__); |
|
|
|
intf->needs_binding = 0; |
|
|
|
if (usb_device_is_owned(udev)) |
|
return error; |
|
|
|
if (udev->authorized == 0) { |
|
dev_err(&intf->dev, "Device is not authorized for usage\n"); |
|
return error; |
|
} else if (intf->authorized == 0) { |
|
dev_err(&intf->dev, "Interface %d is not authorized for usage\n", |
|
intf->altsetting->desc.bInterfaceNumber); |
|
return error; |
|
} |
|
|
|
id = usb_match_dynamic_id(intf, driver); |
|
if (!id) |
|
id = usb_match_id(intf, driver->id_table); |
|
if (!id) |
|
return error; |
|
|
|
dev_dbg(dev, "%s - got id\n", __func__); |
|
|
|
error = usb_autoresume_device(udev); |
|
if (error) |
|
return error; |
|
|
|
intf->condition = USB_INTERFACE_BINDING; |
|
|
|
/* Probed interfaces are initially active. They are |
|
* runtime-PM-enabled only if the driver has autosuspend support. |
|
* They are sensitive to their children's power states. |
|
*/ |
|
pm_runtime_set_active(dev); |
|
pm_suspend_ignore_children(dev, false); |
|
if (driver->supports_autosuspend) |
|
pm_runtime_enable(dev); |
|
|
|
/* If the new driver doesn't allow hub-initiated LPM, and we can't |
|
* disable hub-initiated LPM, then fail the probe. |
|
* |
|
* Otherwise, leaving LPM enabled should be harmless, because the |
|
* endpoint intervals should remain the same, and the U1/U2 timeouts |
|
* should remain the same. |
|
* |
|
* If we need to install alt setting 0 before probe, or another alt |
|
* setting during probe, that should also be fine. usb_set_interface() |
|
* will attempt to disable LPM, and fail if it can't disable it. |
|
*/ |
|
if (driver->disable_hub_initiated_lpm) { |
|
lpm_disable_error = usb_unlocked_disable_lpm(udev); |
|
if (lpm_disable_error) { |
|
dev_err(&intf->dev, "%s Failed to disable LPM for driver %s\n", |
|
__func__, driver->name); |
|
error = lpm_disable_error; |
|
goto err; |
|
} |
|
} |
|
|
|
/* Carry out a deferred switch to altsetting 0 */ |
|
if (intf->needs_altsetting0) { |
|
error = usb_set_interface(udev, intf->altsetting[0]. |
|
desc.bInterfaceNumber, 0); |
|
if (error < 0) |
|
goto err; |
|
intf->needs_altsetting0 = 0; |
|
} |
|
|
|
error = driver->probe(intf, id); |
|
if (error) |
|
goto err; |
|
|
|
intf->condition = USB_INTERFACE_BOUND; |
|
|
|
/* If the LPM disable succeeded, balance the ref counts. */ |
|
if (!lpm_disable_error) |
|
usb_unlocked_enable_lpm(udev); |
|
|
|
usb_autosuspend_device(udev); |
|
return error; |
|
|
|
err: |
|
usb_set_intfdata(intf, NULL); |
|
intf->needs_remote_wakeup = 0; |
|
intf->condition = USB_INTERFACE_UNBOUND; |
|
|
|
/* If the LPM disable succeeded, balance the ref counts. */ |
|
if (!lpm_disable_error) |
|
usb_unlocked_enable_lpm(udev); |
|
|
|
/* Unbound interfaces are always runtime-PM-disabled and -suspended */ |
|
if (driver->supports_autosuspend) |
|
pm_runtime_disable(dev); |
|
pm_runtime_set_suspended(dev); |
|
|
|
usb_autosuspend_device(udev); |
|
return error; |
|
} |
|
|
|
/* called from driver core with dev locked */ |
|
static int usb_unbind_interface(struct device *dev) |
|
{ |
|
struct usb_driver *driver = to_usb_driver(dev->driver); |
|
struct usb_interface *intf = to_usb_interface(dev); |
|
struct usb_host_endpoint *ep, **eps = NULL; |
|
struct usb_device *udev; |
|
int i, j, error, r; |
|
int lpm_disable_error = -ENODEV; |
|
|
|
intf->condition = USB_INTERFACE_UNBINDING; |
|
|
|
/* Autoresume for set_interface call below */ |
|
udev = interface_to_usbdev(intf); |
|
error = usb_autoresume_device(udev); |
|
|
|
/* If hub-initiated LPM policy may change, attempt to disable LPM until |
|
* the driver is unbound. If LPM isn't disabled, that's fine because it |
|
* wouldn't be enabled unless all the bound interfaces supported |
|
* hub-initiated LPM. |
|
*/ |
|
if (driver->disable_hub_initiated_lpm) |
|
lpm_disable_error = usb_unlocked_disable_lpm(udev); |
|
|
|
/* |
|
* Terminate all URBs for this interface unless the driver |
|
* supports "soft" unbinding and the device is still present. |
|
*/ |
|
if (!driver->soft_unbind || udev->state == USB_STATE_NOTATTACHED) |
|
usb_disable_interface(udev, intf, false); |
|
|
|
driver->disconnect(intf); |
|
|
|
/* Free streams */ |
|
for (i = 0, j = 0; i < intf->cur_altsetting->desc.bNumEndpoints; i++) { |
|
ep = &intf->cur_altsetting->endpoint[i]; |
|
if (ep->streams == 0) |
|
continue; |
|
if (j == 0) { |
|
eps = kmalloc_array(USB_MAXENDPOINTS, sizeof(void *), |
|
GFP_KERNEL); |
|
if (!eps) |
|
break; |
|
} |
|
eps[j++] = ep; |
|
} |
|
if (j) { |
|
usb_free_streams(intf, eps, j, GFP_KERNEL); |
|
kfree(eps); |
|
} |
|
|
|
/* Reset other interface state. |
|
* We cannot do a Set-Interface if the device is suspended or |
|
* if it is prepared for a system sleep (since installing a new |
|
* altsetting means creating new endpoint device entries). |
|
* When either of these happens, defer the Set-Interface. |
|
*/ |
|
if (intf->cur_altsetting->desc.bAlternateSetting == 0) { |
|
/* Already in altsetting 0 so skip Set-Interface. |
|
* Just re-enable it without affecting the endpoint toggles. |
|
*/ |
|
usb_enable_interface(udev, intf, false); |
|
} else if (!error && !intf->dev.power.is_prepared) { |
|
r = usb_set_interface(udev, intf->altsetting[0]. |
|
desc.bInterfaceNumber, 0); |
|
if (r < 0) |
|
intf->needs_altsetting0 = 1; |
|
} else { |
|
intf->needs_altsetting0 = 1; |
|
} |
|
usb_set_intfdata(intf, NULL); |
|
|
|
intf->condition = USB_INTERFACE_UNBOUND; |
|
intf->needs_remote_wakeup = 0; |
|
|
|
/* Attempt to re-enable USB3 LPM, if the disable succeeded. */ |
|
if (!lpm_disable_error) |
|
usb_unlocked_enable_lpm(udev); |
|
|
|
/* Unbound interfaces are always runtime-PM-disabled and -suspended */ |
|
if (driver->supports_autosuspend) |
|
pm_runtime_disable(dev); |
|
pm_runtime_set_suspended(dev); |
|
|
|
if (!error) |
|
usb_autosuspend_device(udev); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* usb_driver_claim_interface - bind a driver to an interface |
|
* @driver: the driver to be bound |
|
* @iface: the interface to which it will be bound; must be in the |
|
* usb device's active configuration |
|
* @priv: driver data associated with that interface |
|
* |
|
* This is used by usb device drivers that need to claim more than one |
|
* interface on a device when probing (audio and acm are current examples). |
|
* No device driver should directly modify internal usb_interface or |
|
* usb_device structure members. |
|
* |
|
* Few drivers should need to use this routine, since the most natural |
|
* way to bind to an interface is to return the private data from |
|
* the driver's probe() method. |
|
* |
|
* Callers must own the device lock, so driver probe() entries don't need |
|
* extra locking, but other call contexts may need to explicitly claim that |
|
* lock. |
|
* |
|
* Return: 0 on success. |
|
*/ |
|
int usb_driver_claim_interface(struct usb_driver *driver, |
|
struct usb_interface *iface, void *priv) |
|
{ |
|
struct device *dev; |
|
int retval = 0; |
|
|
|
if (!iface) |
|
return -ENODEV; |
|
|
|
dev = &iface->dev; |
|
if (dev->driver) |
|
return -EBUSY; |
|
|
|
/* reject claim if interface is not authorized */ |
|
if (!iface->authorized) |
|
return -ENODEV; |
|
|
|
dev->driver = &driver->drvwrap.driver; |
|
usb_set_intfdata(iface, priv); |
|
iface->needs_binding = 0; |
|
|
|
iface->condition = USB_INTERFACE_BOUND; |
|
|
|
/* Claimed interfaces are initially inactive (suspended) and |
|
* runtime-PM-enabled, but only if the driver has autosuspend |
|
* support. Otherwise they are marked active, to prevent the |
|
* device from being autosuspended, but left disabled. In either |
|
* case they are sensitive to their children's power states. |
|
*/ |
|
pm_suspend_ignore_children(dev, false); |
|
if (driver->supports_autosuspend) |
|
pm_runtime_enable(dev); |
|
else |
|
pm_runtime_set_active(dev); |
|
|
|
/* if interface was already added, bind now; else let |
|
* the future device_add() bind it, bypassing probe() |
|
*/ |
|
if (device_is_registered(dev)) |
|
retval = device_bind_driver(dev); |
|
|
|
if (retval) { |
|
dev->driver = NULL; |
|
usb_set_intfdata(iface, NULL); |
|
iface->needs_remote_wakeup = 0; |
|
iface->condition = USB_INTERFACE_UNBOUND; |
|
|
|
/* |
|
* Unbound interfaces are always runtime-PM-disabled |
|
* and runtime-PM-suspended |
|
*/ |
|
if (driver->supports_autosuspend) |
|
pm_runtime_disable(dev); |
|
pm_runtime_set_suspended(dev); |
|
} |
|
|
|
return retval; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_driver_claim_interface); |
|
|
|
/** |
|
* usb_driver_release_interface - unbind a driver from an interface |
|
* @driver: the driver to be unbound |
|
* @iface: the interface from which it will be unbound |
|
* |
|
* This can be used by drivers to release an interface without waiting |
|
* for their disconnect() methods to be called. In typical cases this |
|
* also causes the driver disconnect() method to be called. |
|
* |
|
* This call is synchronous, and may not be used in an interrupt context. |
|
* Callers must own the device lock, so driver disconnect() entries don't |
|
* need extra locking, but other call contexts may need to explicitly claim |
|
* that lock. |
|
*/ |
|
void usb_driver_release_interface(struct usb_driver *driver, |
|
struct usb_interface *iface) |
|
{ |
|
struct device *dev = &iface->dev; |
|
|
|
/* this should never happen, don't release something that's not ours */ |
|
if (!dev->driver || dev->driver != &driver->drvwrap.driver) |
|
return; |
|
|
|
/* don't release from within disconnect() */ |
|
if (iface->condition != USB_INTERFACE_BOUND) |
|
return; |
|
iface->condition = USB_INTERFACE_UNBINDING; |
|
|
|
/* Release via the driver core only if the interface |
|
* has already been registered |
|
*/ |
|
if (device_is_registered(dev)) { |
|
device_release_driver(dev); |
|
} else { |
|
device_lock(dev); |
|
usb_unbind_interface(dev); |
|
dev->driver = NULL; |
|
device_unlock(dev); |
|
} |
|
} |
|
EXPORT_SYMBOL_GPL(usb_driver_release_interface); |
|
|
|
/* returns 0 if no match, 1 if match */ |
|
int usb_match_device(struct usb_device *dev, const struct usb_device_id *id) |
|
{ |
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && |
|
id->idVendor != le16_to_cpu(dev->descriptor.idVendor)) |
|
return 0; |
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_PRODUCT) && |
|
id->idProduct != le16_to_cpu(dev->descriptor.idProduct)) |
|
return 0; |
|
|
|
/* No need to test id->bcdDevice_lo != 0, since 0 is never |
|
greater than any unsigned number. */ |
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_LO) && |
|
(id->bcdDevice_lo > le16_to_cpu(dev->descriptor.bcdDevice))) |
|
return 0; |
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_HI) && |
|
(id->bcdDevice_hi < le16_to_cpu(dev->descriptor.bcdDevice))) |
|
return 0; |
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_CLASS) && |
|
(id->bDeviceClass != dev->descriptor.bDeviceClass)) |
|
return 0; |
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_SUBCLASS) && |
|
(id->bDeviceSubClass != dev->descriptor.bDeviceSubClass)) |
|
return 0; |
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_DEV_PROTOCOL) && |
|
(id->bDeviceProtocol != dev->descriptor.bDeviceProtocol)) |
|
return 0; |
|
|
|
return 1; |
|
} |
|
|
|
/* returns 0 if no match, 1 if match */ |
|
int usb_match_one_id_intf(struct usb_device *dev, |
|
struct usb_host_interface *intf, |
|
const struct usb_device_id *id) |
|
{ |
|
/* The interface class, subclass, protocol and number should never be |
|
* checked for a match if the device class is Vendor Specific, |
|
* unless the match record specifies the Vendor ID. */ |
|
if (dev->descriptor.bDeviceClass == USB_CLASS_VENDOR_SPEC && |
|
!(id->match_flags & USB_DEVICE_ID_MATCH_VENDOR) && |
|
(id->match_flags & (USB_DEVICE_ID_MATCH_INT_CLASS | |
|
USB_DEVICE_ID_MATCH_INT_SUBCLASS | |
|
USB_DEVICE_ID_MATCH_INT_PROTOCOL | |
|
USB_DEVICE_ID_MATCH_INT_NUMBER))) |
|
return 0; |
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_CLASS) && |
|
(id->bInterfaceClass != intf->desc.bInterfaceClass)) |
|
return 0; |
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_SUBCLASS) && |
|
(id->bInterfaceSubClass != intf->desc.bInterfaceSubClass)) |
|
return 0; |
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_PROTOCOL) && |
|
(id->bInterfaceProtocol != intf->desc.bInterfaceProtocol)) |
|
return 0; |
|
|
|
if ((id->match_flags & USB_DEVICE_ID_MATCH_INT_NUMBER) && |
|
(id->bInterfaceNumber != intf->desc.bInterfaceNumber)) |
|
return 0; |
|
|
|
return 1; |
|
} |
|
|
|
/* returns 0 if no match, 1 if match */ |
|
int usb_match_one_id(struct usb_interface *interface, |
|
const struct usb_device_id *id) |
|
{ |
|
struct usb_host_interface *intf; |
|
struct usb_device *dev; |
|
|
|
/* proc_connectinfo in devio.c may call us with id == NULL. */ |
|
if (id == NULL) |
|
return 0; |
|
|
|
intf = interface->cur_altsetting; |
|
dev = interface_to_usbdev(interface); |
|
|
|
if (!usb_match_device(dev, id)) |
|
return 0; |
|
|
|
return usb_match_one_id_intf(dev, intf, id); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_match_one_id); |
|
|
|
/** |
|
* usb_match_id - find first usb_device_id matching device or interface |
|
* @interface: the interface of interest |
|
* @id: array of usb_device_id structures, terminated by zero entry |
|
* |
|
* usb_match_id searches an array of usb_device_id's and returns |
|
* the first one matching the device or interface, or null. |
|
* This is used when binding (or rebinding) a driver to an interface. |
|
* Most USB device drivers will use this indirectly, through the usb core, |
|
* but some layered driver frameworks use it directly. |
|
* These device tables are exported with MODULE_DEVICE_TABLE, through |
|
* modutils, to support the driver loading functionality of USB hotplugging. |
|
* |
|
* Return: The first matching usb_device_id, or %NULL. |
|
* |
|
* What Matches: |
|
* |
|
* The "match_flags" element in a usb_device_id controls which |
|
* members are used. If the corresponding bit is set, the |
|
* value in the device_id must match its corresponding member |
|
* in the device or interface descriptor, or else the device_id |
|
* does not match. |
|
* |
|
* "driver_info" is normally used only by device drivers, |
|
* but you can create a wildcard "matches anything" usb_device_id |
|
* as a driver's "modules.usbmap" entry if you provide an id with |
|
* only a nonzero "driver_info" field. If you do this, the USB device |
|
* driver's probe() routine should use additional intelligence to |
|
* decide whether to bind to the specified interface. |
|
* |
|
* What Makes Good usb_device_id Tables: |
|
* |
|
* The match algorithm is very simple, so that intelligence in |
|
* driver selection must come from smart driver id records. |
|
* Unless you have good reasons to use another selection policy, |
|
* provide match elements only in related groups, and order match |
|
* specifiers from specific to general. Use the macros provided |
|
* for that purpose if you can. |
|
* |
|
* The most specific match specifiers use device descriptor |
|
* data. These are commonly used with product-specific matches; |
|
* the USB_DEVICE macro lets you provide vendor and product IDs, |
|
* and you can also match against ranges of product revisions. |
|
* These are widely used for devices with application or vendor |
|
* specific bDeviceClass values. |
|
* |
|
* Matches based on device class/subclass/protocol specifications |
|
* are slightly more general; use the USB_DEVICE_INFO macro, or |
|
* its siblings. These are used with single-function devices |
|
* where bDeviceClass doesn't specify that each interface has |
|
* its own class. |
|
* |
|
* Matches based on interface class/subclass/protocol are the |
|
* most general; they let drivers bind to any interface on a |
|
* multiple-function device. Use the USB_INTERFACE_INFO |
|
* macro, or its siblings, to match class-per-interface style |
|
* devices (as recorded in bInterfaceClass). |
|
* |
|
* Note that an entry created by USB_INTERFACE_INFO won't match |
|
* any interface if the device class is set to Vendor-Specific. |
|
* This is deliberate; according to the USB spec the meanings of |
|
* the interface class/subclass/protocol for these devices are also |
|
* vendor-specific, and hence matching against a standard product |
|
* class wouldn't work anyway. If you really want to use an |
|
* interface-based match for such a device, create a match record |
|
* that also specifies the vendor ID. (Unforunately there isn't a |
|
* standard macro for creating records like this.) |
|
* |
|
* Within those groups, remember that not all combinations are |
|
* meaningful. For example, don't give a product version range |
|
* without vendor and product IDs; or specify a protocol without |
|
* its associated class and subclass. |
|
*/ |
|
const struct usb_device_id *usb_match_id(struct usb_interface *interface, |
|
const struct usb_device_id *id) |
|
{ |
|
/* proc_connectinfo in devio.c may call us with id == NULL. */ |
|
if (id == NULL) |
|
return NULL; |
|
|
|
/* It is important to check that id->driver_info is nonzero, |
|
since an entry that is all zeroes except for a nonzero |
|
id->driver_info is the way to create an entry that |
|
indicates that the driver want to examine every |
|
device and interface. */ |
|
for (; id->idVendor || id->idProduct || id->bDeviceClass || |
|
id->bInterfaceClass || id->driver_info; id++) { |
|
if (usb_match_one_id(interface, id)) |
|
return id; |
|
} |
|
|
|
return NULL; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_match_id); |
|
|
|
const struct usb_device_id *usb_device_match_id(struct usb_device *udev, |
|
const struct usb_device_id *id) |
|
{ |
|
if (!id) |
|
return NULL; |
|
|
|
for (; id->idVendor || id->idProduct ; id++) { |
|
if (usb_match_device(udev, id)) |
|
return id; |
|
} |
|
|
|
return NULL; |
|
} |
|
|
|
bool usb_driver_applicable(struct usb_device *udev, |
|
struct usb_device_driver *udrv) |
|
{ |
|
if (udrv->id_table && udrv->match) |
|
return usb_device_match_id(udev, udrv->id_table) != NULL && |
|
udrv->match(udev); |
|
|
|
if (udrv->id_table) |
|
return usb_device_match_id(udev, udrv->id_table) != NULL; |
|
|
|
if (udrv->match) |
|
return udrv->match(udev); |
|
|
|
return false; |
|
} |
|
|
|
static int usb_device_match(struct device *dev, struct device_driver *drv) |
|
{ |
|
/* devices and interfaces are handled separately */ |
|
if (is_usb_device(dev)) { |
|
struct usb_device *udev; |
|
struct usb_device_driver *udrv; |
|
|
|
/* interface drivers never match devices */ |
|
if (!is_usb_device_driver(drv)) |
|
return 0; |
|
|
|
udev = to_usb_device(dev); |
|
udrv = to_usb_device_driver(drv); |
|
|
|
/* If the device driver under consideration does not have a |
|
* id_table or a match function, then let the driver's probe |
|
* function decide. |
|
*/ |
|
if (!udrv->id_table && !udrv->match) |
|
return 1; |
|
|
|
return usb_driver_applicable(udev, udrv); |
|
|
|
} else if (is_usb_interface(dev)) { |
|
struct usb_interface *intf; |
|
struct usb_driver *usb_drv; |
|
const struct usb_device_id *id; |
|
|
|
/* device drivers never match interfaces */ |
|
if (is_usb_device_driver(drv)) |
|
return 0; |
|
|
|
intf = to_usb_interface(dev); |
|
usb_drv = to_usb_driver(drv); |
|
|
|
id = usb_match_id(intf, usb_drv->id_table); |
|
if (id) |
|
return 1; |
|
|
|
id = usb_match_dynamic_id(intf, usb_drv); |
|
if (id) |
|
return 1; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int usb_uevent(struct device *dev, struct kobj_uevent_env *env) |
|
{ |
|
struct usb_device *usb_dev; |
|
|
|
if (is_usb_device(dev)) { |
|
usb_dev = to_usb_device(dev); |
|
} else if (is_usb_interface(dev)) { |
|
struct usb_interface *intf = to_usb_interface(dev); |
|
|
|
usb_dev = interface_to_usbdev(intf); |
|
} else { |
|
return 0; |
|
} |
|
|
|
if (usb_dev->devnum < 0) { |
|
/* driver is often null here; dev_dbg() would oops */ |
|
pr_debug("usb %s: already deleted?\n", dev_name(dev)); |
|
return -ENODEV; |
|
} |
|
if (!usb_dev->bus) { |
|
pr_debug("usb %s: bus removed?\n", dev_name(dev)); |
|
return -ENODEV; |
|
} |
|
|
|
/* per-device configurations are common */ |
|
if (add_uevent_var(env, "PRODUCT=%x/%x/%x", |
|
le16_to_cpu(usb_dev->descriptor.idVendor), |
|
le16_to_cpu(usb_dev->descriptor.idProduct), |
|
le16_to_cpu(usb_dev->descriptor.bcdDevice))) |
|
return -ENOMEM; |
|
|
|
/* class-based driver binding models */ |
|
if (add_uevent_var(env, "TYPE=%d/%d/%d", |
|
usb_dev->descriptor.bDeviceClass, |
|
usb_dev->descriptor.bDeviceSubClass, |
|
usb_dev->descriptor.bDeviceProtocol)) |
|
return -ENOMEM; |
|
|
|
return 0; |
|
} |
|
|
|
static int __usb_bus_reprobe_drivers(struct device *dev, void *data) |
|
{ |
|
struct usb_device_driver *new_udriver = data; |
|
struct usb_device *udev; |
|
int ret; |
|
|
|
/* Don't reprobe if current driver isn't usb_generic_driver */ |
|
if (dev->driver != &usb_generic_driver.drvwrap.driver) |
|
return 0; |
|
|
|
udev = to_usb_device(dev); |
|
if (!usb_driver_applicable(udev, new_udriver)) |
|
return 0; |
|
|
|
ret = device_reprobe(dev); |
|
if (ret && ret != -EPROBE_DEFER) |
|
dev_err(dev, "Failed to reprobe device (error %d)\n", ret); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* usb_register_device_driver - register a USB device (not interface) driver |
|
* @new_udriver: USB operations for the device driver |
|
* @owner: module owner of this driver. |
|
* |
|
* Registers a USB device driver with the USB core. The list of |
|
* unattached devices will be rescanned whenever a new driver is |
|
* added, allowing the new driver to attach to any recognized devices. |
|
* |
|
* Return: A negative error code on failure and 0 on success. |
|
*/ |
|
int usb_register_device_driver(struct usb_device_driver *new_udriver, |
|
struct module *owner) |
|
{ |
|
int retval = 0; |
|
|
|
if (usb_disabled()) |
|
return -ENODEV; |
|
|
|
new_udriver->drvwrap.for_devices = 1; |
|
new_udriver->drvwrap.driver.name = new_udriver->name; |
|
new_udriver->drvwrap.driver.bus = &usb_bus_type; |
|
new_udriver->drvwrap.driver.probe = usb_probe_device; |
|
new_udriver->drvwrap.driver.remove = usb_unbind_device; |
|
new_udriver->drvwrap.driver.owner = owner; |
|
new_udriver->drvwrap.driver.dev_groups = new_udriver->dev_groups; |
|
|
|
retval = driver_register(&new_udriver->drvwrap.driver); |
|
|
|
if (!retval) { |
|
pr_info("%s: registered new device driver %s\n", |
|
usbcore_name, new_udriver->name); |
|
/* |
|
* Check whether any device could be better served with |
|
* this new driver |
|
*/ |
|
bus_for_each_dev(&usb_bus_type, NULL, new_udriver, |
|
__usb_bus_reprobe_drivers); |
|
} else { |
|
pr_err("%s: error %d registering device driver %s\n", |
|
usbcore_name, retval, new_udriver->name); |
|
} |
|
|
|
return retval; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_register_device_driver); |
|
|
|
/** |
|
* usb_deregister_device_driver - unregister a USB device (not interface) driver |
|
* @udriver: USB operations of the device driver to unregister |
|
* Context: must be able to sleep |
|
* |
|
* Unlinks the specified driver from the internal USB driver list. |
|
*/ |
|
void usb_deregister_device_driver(struct usb_device_driver *udriver) |
|
{ |
|
pr_info("%s: deregistering device driver %s\n", |
|
usbcore_name, udriver->name); |
|
|
|
driver_unregister(&udriver->drvwrap.driver); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_deregister_device_driver); |
|
|
|
/** |
|
* usb_register_driver - register a USB interface driver |
|
* @new_driver: USB operations for the interface driver |
|
* @owner: module owner of this driver. |
|
* @mod_name: module name string |
|
* |
|
* Registers a USB interface driver with the USB core. The list of |
|
* unattached interfaces will be rescanned whenever a new driver is |
|
* added, allowing the new driver to attach to any recognized interfaces. |
|
* |
|
* Return: A negative error code on failure and 0 on success. |
|
* |
|
* NOTE: if you want your driver to use the USB major number, you must call |
|
* usb_register_dev() to enable that functionality. This function no longer |
|
* takes care of that. |
|
*/ |
|
int usb_register_driver(struct usb_driver *new_driver, struct module *owner, |
|
const char *mod_name) |
|
{ |
|
int retval = 0; |
|
|
|
if (usb_disabled()) |
|
return -ENODEV; |
|
|
|
new_driver->drvwrap.for_devices = 0; |
|
new_driver->drvwrap.driver.name = new_driver->name; |
|
new_driver->drvwrap.driver.bus = &usb_bus_type; |
|
new_driver->drvwrap.driver.probe = usb_probe_interface; |
|
new_driver->drvwrap.driver.remove = usb_unbind_interface; |
|
new_driver->drvwrap.driver.owner = owner; |
|
new_driver->drvwrap.driver.mod_name = mod_name; |
|
new_driver->drvwrap.driver.dev_groups = new_driver->dev_groups; |
|
spin_lock_init(&new_driver->dynids.lock); |
|
INIT_LIST_HEAD(&new_driver->dynids.list); |
|
|
|
retval = driver_register(&new_driver->drvwrap.driver); |
|
if (retval) |
|
goto out; |
|
|
|
retval = usb_create_newid_files(new_driver); |
|
if (retval) |
|
goto out_newid; |
|
|
|
pr_info("%s: registered new interface driver %s\n", |
|
usbcore_name, new_driver->name); |
|
|
|
out: |
|
return retval; |
|
|
|
out_newid: |
|
driver_unregister(&new_driver->drvwrap.driver); |
|
|
|
pr_err("%s: error %d registering interface driver %s\n", |
|
usbcore_name, retval, new_driver->name); |
|
goto out; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_register_driver); |
|
|
|
/** |
|
* usb_deregister - unregister a USB interface driver |
|
* @driver: USB operations of the interface driver to unregister |
|
* Context: must be able to sleep |
|
* |
|
* Unlinks the specified driver from the internal USB driver list. |
|
* |
|
* NOTE: If you called usb_register_dev(), you still need to call |
|
* usb_deregister_dev() to clean up your driver's allocated minor numbers, |
|
* this * call will no longer do it for you. |
|
*/ |
|
void usb_deregister(struct usb_driver *driver) |
|
{ |
|
pr_info("%s: deregistering interface driver %s\n", |
|
usbcore_name, driver->name); |
|
|
|
usb_remove_newid_files(driver); |
|
driver_unregister(&driver->drvwrap.driver); |
|
usb_free_dynids(driver); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_deregister); |
|
|
|
/* Forced unbinding of a USB interface driver, either because |
|
* it doesn't support pre_reset/post_reset/reset_resume or |
|
* because it doesn't support suspend/resume. |
|
* |
|
* The caller must hold @intf's device's lock, but not @intf's lock. |
|
*/ |
|
void usb_forced_unbind_intf(struct usb_interface *intf) |
|
{ |
|
struct usb_driver *driver = to_usb_driver(intf->dev.driver); |
|
|
|
dev_dbg(&intf->dev, "forced unbind\n"); |
|
usb_driver_release_interface(driver, intf); |
|
|
|
/* Mark the interface for later rebinding */ |
|
intf->needs_binding = 1; |
|
} |
|
|
|
/* |
|
* Unbind drivers for @udev's marked interfaces. These interfaces have |
|
* the needs_binding flag set, for example by usb_resume_interface(). |
|
* |
|
* The caller must hold @udev's device lock. |
|
*/ |
|
static void unbind_marked_interfaces(struct usb_device *udev) |
|
{ |
|
struct usb_host_config *config; |
|
int i; |
|
struct usb_interface *intf; |
|
|
|
config = udev->actconfig; |
|
if (config) { |
|
for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
|
intf = config->interface[i]; |
|
if (intf->dev.driver && intf->needs_binding) |
|
usb_forced_unbind_intf(intf); |
|
} |
|
} |
|
} |
|
|
|
/* Delayed forced unbinding of a USB interface driver and scan |
|
* for rebinding. |
|
* |
|
* The caller must hold @intf's device's lock, but not @intf's lock. |
|
* |
|
* Note: Rebinds will be skipped if a system sleep transition is in |
|
* progress and the PM "complete" callback hasn't occurred yet. |
|
*/ |
|
static void usb_rebind_intf(struct usb_interface *intf) |
|
{ |
|
int rc; |
|
|
|
/* Delayed unbind of an existing driver */ |
|
if (intf->dev.driver) |
|
usb_forced_unbind_intf(intf); |
|
|
|
/* Try to rebind the interface */ |
|
if (!intf->dev.power.is_prepared) { |
|
intf->needs_binding = 0; |
|
rc = device_attach(&intf->dev); |
|
if (rc < 0 && rc != -EPROBE_DEFER) |
|
dev_warn(&intf->dev, "rebind failed: %d\n", rc); |
|
} |
|
} |
|
|
|
/* |
|
* Rebind drivers to @udev's marked interfaces. These interfaces have |
|
* the needs_binding flag set. |
|
* |
|
* The caller must hold @udev's device lock. |
|
*/ |
|
static void rebind_marked_interfaces(struct usb_device *udev) |
|
{ |
|
struct usb_host_config *config; |
|
int i; |
|
struct usb_interface *intf; |
|
|
|
config = udev->actconfig; |
|
if (config) { |
|
for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
|
intf = config->interface[i]; |
|
if (intf->needs_binding) |
|
usb_rebind_intf(intf); |
|
} |
|
} |
|
} |
|
|
|
/* |
|
* Unbind all of @udev's marked interfaces and then rebind all of them. |
|
* This ordering is necessary because some drivers claim several interfaces |
|
* when they are first probed. |
|
* |
|
* The caller must hold @udev's device lock. |
|
*/ |
|
void usb_unbind_and_rebind_marked_interfaces(struct usb_device *udev) |
|
{ |
|
unbind_marked_interfaces(udev); |
|
rebind_marked_interfaces(udev); |
|
} |
|
|
|
#ifdef CONFIG_PM |
|
|
|
/* Unbind drivers for @udev's interfaces that don't support suspend/resume |
|
* There is no check for reset_resume here because it can be determined |
|
* only during resume whether reset_resume is needed. |
|
* |
|
* The caller must hold @udev's device lock. |
|
*/ |
|
static void unbind_no_pm_drivers_interfaces(struct usb_device *udev) |
|
{ |
|
struct usb_host_config *config; |
|
int i; |
|
struct usb_interface *intf; |
|
struct usb_driver *drv; |
|
|
|
config = udev->actconfig; |
|
if (config) { |
|
for (i = 0; i < config->desc.bNumInterfaces; ++i) { |
|
intf = config->interface[i]; |
|
|
|
if (intf->dev.driver) { |
|
drv = to_usb_driver(intf->dev.driver); |
|
if (!drv->suspend || !drv->resume) |
|
usb_forced_unbind_intf(intf); |
|
} |
|
} |
|
} |
|
} |
|
|
|
static int usb_suspend_device(struct usb_device *udev, pm_message_t msg) |
|
{ |
|
struct usb_device_driver *udriver; |
|
int status = 0; |
|
|
|
if (udev->state == USB_STATE_NOTATTACHED || |
|
udev->state == USB_STATE_SUSPENDED) |
|
goto done; |
|
|
|
/* For devices that don't have a driver, we do a generic suspend. */ |
|
if (udev->dev.driver) |
|
udriver = to_usb_device_driver(udev->dev.driver); |
|
else { |
|
udev->do_remote_wakeup = 0; |
|
udriver = &usb_generic_driver; |
|
} |
|
if (udriver->suspend) |
|
status = udriver->suspend(udev, msg); |
|
if (status == 0 && udriver->generic_subclass) |
|
status = usb_generic_driver_suspend(udev, msg); |
|
|
|
done: |
|
dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
|
return status; |
|
} |
|
|
|
static int usb_resume_device(struct usb_device *udev, pm_message_t msg) |
|
{ |
|
struct usb_device_driver *udriver; |
|
int status = 0; |
|
|
|
if (udev->state == USB_STATE_NOTATTACHED) |
|
goto done; |
|
|
|
/* Can't resume it if it doesn't have a driver. */ |
|
if (udev->dev.driver == NULL) { |
|
status = -ENOTCONN; |
|
goto done; |
|
} |
|
|
|
/* Non-root devices on a full/low-speed bus must wait for their |
|
* companion high-speed root hub, in case a handoff is needed. |
|
*/ |
|
if (!PMSG_IS_AUTO(msg) && udev->parent && udev->bus->hs_companion) |
|
device_pm_wait_for_dev(&udev->dev, |
|
&udev->bus->hs_companion->root_hub->dev); |
|
|
|
if (udev->quirks & USB_QUIRK_RESET_RESUME) |
|
udev->reset_resume = 1; |
|
|
|
udriver = to_usb_device_driver(udev->dev.driver); |
|
if (udriver->generic_subclass) |
|
status = usb_generic_driver_resume(udev, msg); |
|
if (status == 0 && udriver->resume) |
|
status = udriver->resume(udev, msg); |
|
|
|
done: |
|
dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
|
return status; |
|
} |
|
|
|
static int usb_suspend_interface(struct usb_device *udev, |
|
struct usb_interface *intf, pm_message_t msg) |
|
{ |
|
struct usb_driver *driver; |
|
int status = 0; |
|
|
|
if (udev->state == USB_STATE_NOTATTACHED || |
|
intf->condition == USB_INTERFACE_UNBOUND) |
|
goto done; |
|
driver = to_usb_driver(intf->dev.driver); |
|
|
|
/* at this time we know the driver supports suspend */ |
|
status = driver->suspend(intf, msg); |
|
if (status && !PMSG_IS_AUTO(msg)) |
|
dev_err(&intf->dev, "suspend error %d\n", status); |
|
|
|
done: |
|
dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status); |
|
return status; |
|
} |
|
|
|
static int usb_resume_interface(struct usb_device *udev, |
|
struct usb_interface *intf, pm_message_t msg, int reset_resume) |
|
{ |
|
struct usb_driver *driver; |
|
int status = 0; |
|
|
|
if (udev->state == USB_STATE_NOTATTACHED) |
|
goto done; |
|
|
|
/* Don't let autoresume interfere with unbinding */ |
|
if (intf->condition == USB_INTERFACE_UNBINDING) |
|
goto done; |
|
|
|
/* Can't resume it if it doesn't have a driver. */ |
|
if (intf->condition == USB_INTERFACE_UNBOUND) { |
|
|
|
/* Carry out a deferred switch to altsetting 0 */ |
|
if (intf->needs_altsetting0 && !intf->dev.power.is_prepared) { |
|
usb_set_interface(udev, intf->altsetting[0]. |
|
desc.bInterfaceNumber, 0); |
|
intf->needs_altsetting0 = 0; |
|
} |
|
goto done; |
|
} |
|
|
|
/* Don't resume if the interface is marked for rebinding */ |
|
if (intf->needs_binding) |
|
goto done; |
|
driver = to_usb_driver(intf->dev.driver); |
|
|
|
if (reset_resume) { |
|
if (driver->reset_resume) { |
|
status = driver->reset_resume(intf); |
|
if (status) |
|
dev_err(&intf->dev, "%s error %d\n", |
|
"reset_resume", status); |
|
} else { |
|
intf->needs_binding = 1; |
|
dev_dbg(&intf->dev, "no reset_resume for driver %s?\n", |
|
driver->name); |
|
} |
|
} else { |
|
status = driver->resume(intf); |
|
if (status) |
|
dev_err(&intf->dev, "resume error %d\n", status); |
|
} |
|
|
|
done: |
|
dev_vdbg(&intf->dev, "%s: status %d\n", __func__, status); |
|
|
|
/* Later we will unbind the driver and/or reprobe, if necessary */ |
|
return status; |
|
} |
|
|
|
/** |
|
* usb_suspend_both - suspend a USB device and its interfaces |
|
* @udev: the usb_device to suspend |
|
* @msg: Power Management message describing this state transition |
|
* |
|
* This is the central routine for suspending USB devices. It calls the |
|
* suspend methods for all the interface drivers in @udev and then calls |
|
* the suspend method for @udev itself. When the routine is called in |
|
* autosuspend, if an error occurs at any stage, all the interfaces |
|
* which were suspended are resumed so that they remain in the same |
|
* state as the device, but when called from system sleep, all error |
|
* from suspend methods of interfaces and the non-root-hub device itself |
|
* are simply ignored, so all suspended interfaces are only resumed |
|
* to the device's state when @udev is root-hub and its suspend method |
|
* returns failure. |
|
* |
|
* Autosuspend requests originating from a child device or an interface |
|
* driver may be made without the protection of @udev's device lock, but |
|
* all other suspend calls will hold the lock. Usbcore will insure that |
|
* method calls do not arrive during bind, unbind, or reset operations. |
|
* However drivers must be prepared to handle suspend calls arriving at |
|
* unpredictable times. |
|
* |
|
* This routine can run only in process context. |
|
* |
|
* Return: 0 if the suspend succeeded. |
|
*/ |
|
static int usb_suspend_both(struct usb_device *udev, pm_message_t msg) |
|
{ |
|
int status = 0; |
|
int i = 0, n = 0; |
|
struct usb_interface *intf; |
|
|
|
if (udev->state == USB_STATE_NOTATTACHED || |
|
udev->state == USB_STATE_SUSPENDED) |
|
goto done; |
|
|
|
/* Suspend all the interfaces and then udev itself */ |
|
if (udev->actconfig) { |
|
n = udev->actconfig->desc.bNumInterfaces; |
|
for (i = n - 1; i >= 0; --i) { |
|
intf = udev->actconfig->interface[i]; |
|
status = usb_suspend_interface(udev, intf, msg); |
|
|
|
/* Ignore errors during system sleep transitions */ |
|
if (!PMSG_IS_AUTO(msg)) |
|
status = 0; |
|
if (status != 0) |
|
break; |
|
} |
|
} |
|
if (status == 0) { |
|
status = usb_suspend_device(udev, msg); |
|
|
|
/* |
|
* Ignore errors from non-root-hub devices during |
|
* system sleep transitions. For the most part, |
|
* these devices should go to low power anyway when |
|
* the entire bus is suspended. |
|
*/ |
|
if (udev->parent && !PMSG_IS_AUTO(msg)) |
|
status = 0; |
|
|
|
/* |
|
* If the device is inaccessible, don't try to resume |
|
* suspended interfaces and just return the error. |
|
*/ |
|
if (status && status != -EBUSY) { |
|
int err; |
|
u16 devstat; |
|
|
|
err = usb_get_std_status(udev, USB_RECIP_DEVICE, 0, |
|
&devstat); |
|
if (err) { |
|
dev_err(&udev->dev, |
|
"Failed to suspend device, error %d\n", |
|
status); |
|
goto done; |
|
} |
|
} |
|
} |
|
|
|
/* If the suspend failed, resume interfaces that did get suspended */ |
|
if (status != 0) { |
|
if (udev->actconfig) { |
|
msg.event ^= (PM_EVENT_SUSPEND | PM_EVENT_RESUME); |
|
while (++i < n) { |
|
intf = udev->actconfig->interface[i]; |
|
usb_resume_interface(udev, intf, msg, 0); |
|
} |
|
} |
|
|
|
/* If the suspend succeeded then prevent any more URB submissions |
|
* and flush any outstanding URBs. |
|
*/ |
|
} else { |
|
udev->can_submit = 0; |
|
for (i = 0; i < 16; ++i) { |
|
usb_hcd_flush_endpoint(udev, udev->ep_out[i]); |
|
usb_hcd_flush_endpoint(udev, udev->ep_in[i]); |
|
} |
|
} |
|
|
|
done: |
|
dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
|
return status; |
|
} |
|
|
|
/** |
|
* usb_resume_both - resume a USB device and its interfaces |
|
* @udev: the usb_device to resume |
|
* @msg: Power Management message describing this state transition |
|
* |
|
* This is the central routine for resuming USB devices. It calls the |
|
* the resume method for @udev and then calls the resume methods for all |
|
* the interface drivers in @udev. |
|
* |
|
* Autoresume requests originating from a child device or an interface |
|
* driver may be made without the protection of @udev's device lock, but |
|
* all other resume calls will hold the lock. Usbcore will insure that |
|
* method calls do not arrive during bind, unbind, or reset operations. |
|
* However drivers must be prepared to handle resume calls arriving at |
|
* unpredictable times. |
|
* |
|
* This routine can run only in process context. |
|
* |
|
* Return: 0 on success. |
|
*/ |
|
static int usb_resume_both(struct usb_device *udev, pm_message_t msg) |
|
{ |
|
int status = 0; |
|
int i; |
|
struct usb_interface *intf; |
|
|
|
if (udev->state == USB_STATE_NOTATTACHED) { |
|
status = -ENODEV; |
|
goto done; |
|
} |
|
udev->can_submit = 1; |
|
|
|
/* Resume the device */ |
|
if (udev->state == USB_STATE_SUSPENDED || udev->reset_resume) |
|
status = usb_resume_device(udev, msg); |
|
|
|
/* Resume the interfaces */ |
|
if (status == 0 && udev->actconfig) { |
|
for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
|
intf = udev->actconfig->interface[i]; |
|
usb_resume_interface(udev, intf, msg, |
|
udev->reset_resume); |
|
} |
|
} |
|
usb_mark_last_busy(udev); |
|
|
|
done: |
|
dev_vdbg(&udev->dev, "%s: status %d\n", __func__, status); |
|
if (!status) |
|
udev->reset_resume = 0; |
|
return status; |
|
} |
|
|
|
static void choose_wakeup(struct usb_device *udev, pm_message_t msg) |
|
{ |
|
int w; |
|
|
|
/* Remote wakeup is needed only when we actually go to sleep. |
|
* For things like FREEZE and QUIESCE, if the device is already |
|
* autosuspended then its current wakeup setting is okay. |
|
*/ |
|
if (msg.event == PM_EVENT_FREEZE || msg.event == PM_EVENT_QUIESCE) { |
|
if (udev->state != USB_STATE_SUSPENDED) |
|
udev->do_remote_wakeup = 0; |
|
return; |
|
} |
|
|
|
/* Enable remote wakeup if it is allowed, even if no interface drivers |
|
* actually want it. |
|
*/ |
|
w = device_may_wakeup(&udev->dev); |
|
|
|
/* If the device is autosuspended with the wrong wakeup setting, |
|
* autoresume now so the setting can be changed. |
|
*/ |
|
if (udev->state == USB_STATE_SUSPENDED && w != udev->do_remote_wakeup) |
|
pm_runtime_resume(&udev->dev); |
|
udev->do_remote_wakeup = w; |
|
} |
|
|
|
/* The device lock is held by the PM core */ |
|
int usb_suspend(struct device *dev, pm_message_t msg) |
|
{ |
|
struct usb_device *udev = to_usb_device(dev); |
|
int r; |
|
|
|
unbind_no_pm_drivers_interfaces(udev); |
|
|
|
/* From now on we are sure all drivers support suspend/resume |
|
* but not necessarily reset_resume() |
|
* so we may still need to unbind and rebind upon resume |
|
*/ |
|
choose_wakeup(udev, msg); |
|
r = usb_suspend_both(udev, msg); |
|
if (r) |
|
return r; |
|
|
|
if (udev->quirks & USB_QUIRK_DISCONNECT_SUSPEND) |
|
usb_port_disable(udev); |
|
|
|
return 0; |
|
} |
|
|
|
/* The device lock is held by the PM core */ |
|
int usb_resume_complete(struct device *dev) |
|
{ |
|
struct usb_device *udev = to_usb_device(dev); |
|
|
|
/* For PM complete calls, all we do is rebind interfaces |
|
* whose needs_binding flag is set |
|
*/ |
|
if (udev->state != USB_STATE_NOTATTACHED) |
|
rebind_marked_interfaces(udev); |
|
return 0; |
|
} |
|
|
|
/* The device lock is held by the PM core */ |
|
int usb_resume(struct device *dev, pm_message_t msg) |
|
{ |
|
struct usb_device *udev = to_usb_device(dev); |
|
int status; |
|
|
|
/* For all calls, take the device back to full power and |
|
* tell the PM core in case it was autosuspended previously. |
|
* Unbind the interfaces that will need rebinding later, |
|
* because they fail to support reset_resume. |
|
* (This can't be done in usb_resume_interface() |
|
* above because it doesn't own the right set of locks.) |
|
*/ |
|
status = usb_resume_both(udev, msg); |
|
if (status == 0) { |
|
pm_runtime_disable(dev); |
|
pm_runtime_set_active(dev); |
|
pm_runtime_enable(dev); |
|
unbind_marked_interfaces(udev); |
|
} |
|
|
|
/* Avoid PM error messages for devices disconnected while suspended |
|
* as we'll display regular disconnect messages just a bit later. |
|
*/ |
|
if (status == -ENODEV || status == -ESHUTDOWN) |
|
status = 0; |
|
return status; |
|
} |
|
|
|
/** |
|
* usb_enable_autosuspend - allow a USB device to be autosuspended |
|
* @udev: the USB device which may be autosuspended |
|
* |
|
* This routine allows @udev to be autosuspended. An autosuspend won't |
|
* take place until the autosuspend_delay has elapsed and all the other |
|
* necessary conditions are satisfied. |
|
* |
|
* The caller must hold @udev's device lock. |
|
*/ |
|
void usb_enable_autosuspend(struct usb_device *udev) |
|
{ |
|
pm_runtime_allow(&udev->dev); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_enable_autosuspend); |
|
|
|
/** |
|
* usb_disable_autosuspend - prevent a USB device from being autosuspended |
|
* @udev: the USB device which may not be autosuspended |
|
* |
|
* This routine prevents @udev from being autosuspended and wakes it up |
|
* if it is already autosuspended. |
|
* |
|
* The caller must hold @udev's device lock. |
|
*/ |
|
void usb_disable_autosuspend(struct usb_device *udev) |
|
{ |
|
pm_runtime_forbid(&udev->dev); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_disable_autosuspend); |
|
|
|
/** |
|
* usb_autosuspend_device - delayed autosuspend of a USB device and its interfaces |
|
* @udev: the usb_device to autosuspend |
|
* |
|
* This routine should be called when a core subsystem is finished using |
|
* @udev and wants to allow it to autosuspend. Examples would be when |
|
* @udev's device file in usbfs is closed or after a configuration change. |
|
* |
|
* @udev's usage counter is decremented; if it drops to 0 and all the |
|
* interfaces are inactive then a delayed autosuspend will be attempted. |
|
* The attempt may fail (see autosuspend_check()). |
|
* |
|
* The caller must hold @udev's device lock. |
|
* |
|
* This routine can run only in process context. |
|
*/ |
|
void usb_autosuspend_device(struct usb_device *udev) |
|
{ |
|
int status; |
|
|
|
usb_mark_last_busy(udev); |
|
status = pm_runtime_put_sync_autosuspend(&udev->dev); |
|
dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n", |
|
__func__, atomic_read(&udev->dev.power.usage_count), |
|
status); |
|
} |
|
|
|
/** |
|
* usb_autoresume_device - immediately autoresume a USB device and its interfaces |
|
* @udev: the usb_device to autoresume |
|
* |
|
* This routine should be called when a core subsystem wants to use @udev |
|
* and needs to guarantee that it is not suspended. No autosuspend will |
|
* occur until usb_autosuspend_device() is called. (Note that this will |
|
* not prevent suspend events originating in the PM core.) Examples would |
|
* be when @udev's device file in usbfs is opened or when a remote-wakeup |
|
* request is received. |
|
* |
|
* @udev's usage counter is incremented to prevent subsequent autosuspends. |
|
* However if the autoresume fails then the usage counter is re-decremented. |
|
* |
|
* The caller must hold @udev's device lock. |
|
* |
|
* This routine can run only in process context. |
|
* |
|
* Return: 0 on success. A negative error code otherwise. |
|
*/ |
|
int usb_autoresume_device(struct usb_device *udev) |
|
{ |
|
int status; |
|
|
|
status = pm_runtime_get_sync(&udev->dev); |
|
if (status < 0) |
|
pm_runtime_put_sync(&udev->dev); |
|
dev_vdbg(&udev->dev, "%s: cnt %d -> %d\n", |
|
__func__, atomic_read(&udev->dev.power.usage_count), |
|
status); |
|
if (status > 0) |
|
status = 0; |
|
return status; |
|
} |
|
|
|
/** |
|
* usb_autopm_put_interface - decrement a USB interface's PM-usage counter |
|
* @intf: the usb_interface whose counter should be decremented |
|
* |
|
* This routine should be called by an interface driver when it is |
|
* finished using @intf and wants to allow it to autosuspend. A typical |
|
* example would be a character-device driver when its device file is |
|
* closed. |
|
* |
|
* The routine decrements @intf's usage counter. When the counter reaches |
|
* 0, a delayed autosuspend request for @intf's device is attempted. The |
|
* attempt may fail (see autosuspend_check()). |
|
* |
|
* This routine can run only in process context. |
|
*/ |
|
void usb_autopm_put_interface(struct usb_interface *intf) |
|
{ |
|
struct usb_device *udev = interface_to_usbdev(intf); |
|
int status; |
|
|
|
usb_mark_last_busy(udev); |
|
status = pm_runtime_put_sync(&intf->dev); |
|
dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", |
|
__func__, atomic_read(&intf->dev.power.usage_count), |
|
status); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_autopm_put_interface); |
|
|
|
/** |
|
* usb_autopm_put_interface_async - decrement a USB interface's PM-usage counter |
|
* @intf: the usb_interface whose counter should be decremented |
|
* |
|
* This routine does much the same thing as usb_autopm_put_interface(): |
|
* It decrements @intf's usage counter and schedules a delayed |
|
* autosuspend request if the counter is <= 0. The difference is that it |
|
* does not perform any synchronization; callers should hold a private |
|
* lock and handle all synchronization issues themselves. |
|
* |
|
* Typically a driver would call this routine during an URB's completion |
|
* handler, if no more URBs were pending. |
|
* |
|
* This routine can run in atomic context. |
|
*/ |
|
void usb_autopm_put_interface_async(struct usb_interface *intf) |
|
{ |
|
struct usb_device *udev = interface_to_usbdev(intf); |
|
int status; |
|
|
|
usb_mark_last_busy(udev); |
|
status = pm_runtime_put(&intf->dev); |
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dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", |
|
__func__, atomic_read(&intf->dev.power.usage_count), |
|
status); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_autopm_put_interface_async); |
|
|
|
/** |
|
* usb_autopm_put_interface_no_suspend - decrement a USB interface's PM-usage counter |
|
* @intf: the usb_interface whose counter should be decremented |
|
* |
|
* This routine decrements @intf's usage counter but does not carry out an |
|
* autosuspend. |
|
* |
|
* This routine can run in atomic context. |
|
*/ |
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void usb_autopm_put_interface_no_suspend(struct usb_interface *intf) |
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{ |
|
struct usb_device *udev = interface_to_usbdev(intf); |
|
|
|
usb_mark_last_busy(udev); |
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pm_runtime_put_noidle(&intf->dev); |
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} |
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EXPORT_SYMBOL_GPL(usb_autopm_put_interface_no_suspend); |
|
|
|
/** |
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* usb_autopm_get_interface - increment a USB interface's PM-usage counter |
|
* @intf: the usb_interface whose counter should be incremented |
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* |
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* This routine should be called by an interface driver when it wants to |
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* use @intf and needs to guarantee that it is not suspended. In addition, |
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* the routine prevents @intf from being autosuspended subsequently. (Note |
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* that this will not prevent suspend events originating in the PM core.) |
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* This prevention will persist until usb_autopm_put_interface() is called |
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* or @intf is unbound. A typical example would be a character-device |
|
* driver when its device file is opened. |
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* |
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* @intf's usage counter is incremented to prevent subsequent autosuspends. |
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* However if the autoresume fails then the counter is re-decremented. |
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* |
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* This routine can run only in process context. |
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* |
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* Return: 0 on success. |
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*/ |
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int usb_autopm_get_interface(struct usb_interface *intf) |
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{ |
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int status; |
|
|
|
status = pm_runtime_get_sync(&intf->dev); |
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if (status < 0) |
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pm_runtime_put_sync(&intf->dev); |
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dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", |
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__func__, atomic_read(&intf->dev.power.usage_count), |
|
status); |
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if (status > 0) |
|
status = 0; |
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return status; |
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} |
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EXPORT_SYMBOL_GPL(usb_autopm_get_interface); |
|
|
|
/** |
|
* usb_autopm_get_interface_async - increment a USB interface's PM-usage counter |
|
* @intf: the usb_interface whose counter should be incremented |
|
* |
|
* This routine does much the same thing as |
|
* usb_autopm_get_interface(): It increments @intf's usage counter and |
|
* queues an autoresume request if the device is suspended. The |
|
* differences are that it does not perform any synchronization (callers |
|
* should hold a private lock and handle all synchronization issues |
|
* themselves), and it does not autoresume the device directly (it only |
|
* queues a request). After a successful call, the device may not yet be |
|
* resumed. |
|
* |
|
* This routine can run in atomic context. |
|
* |
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* Return: 0 on success. A negative error code otherwise. |
|
*/ |
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int usb_autopm_get_interface_async(struct usb_interface *intf) |
|
{ |
|
int status; |
|
|
|
status = pm_runtime_get(&intf->dev); |
|
if (status < 0 && status != -EINPROGRESS) |
|
pm_runtime_put_noidle(&intf->dev); |
|
dev_vdbg(&intf->dev, "%s: cnt %d -> %d\n", |
|
__func__, atomic_read(&intf->dev.power.usage_count), |
|
status); |
|
if (status > 0 || status == -EINPROGRESS) |
|
status = 0; |
|
return status; |
|
} |
|
EXPORT_SYMBOL_GPL(usb_autopm_get_interface_async); |
|
|
|
/** |
|
* usb_autopm_get_interface_no_resume - increment a USB interface's PM-usage counter |
|
* @intf: the usb_interface whose counter should be incremented |
|
* |
|
* This routine increments @intf's usage counter but does not carry out an |
|
* autoresume. |
|
* |
|
* This routine can run in atomic context. |
|
*/ |
|
void usb_autopm_get_interface_no_resume(struct usb_interface *intf) |
|
{ |
|
struct usb_device *udev = interface_to_usbdev(intf); |
|
|
|
usb_mark_last_busy(udev); |
|
pm_runtime_get_noresume(&intf->dev); |
|
} |
|
EXPORT_SYMBOL_GPL(usb_autopm_get_interface_no_resume); |
|
|
|
/* Internal routine to check whether we may autosuspend a device. */ |
|
static int autosuspend_check(struct usb_device *udev) |
|
{ |
|
int w, i; |
|
struct usb_interface *intf; |
|
|
|
if (udev->state == USB_STATE_NOTATTACHED) |
|
return -ENODEV; |
|
|
|
/* Fail if autosuspend is disabled, or any interfaces are in use, or |
|
* any interface drivers require remote wakeup but it isn't available. |
|
*/ |
|
w = 0; |
|
if (udev->actconfig) { |
|
for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) { |
|
intf = udev->actconfig->interface[i]; |
|
|
|
/* We don't need to check interfaces that are |
|
* disabled for runtime PM. Either they are unbound |
|
* or else their drivers don't support autosuspend |
|
* and so they are permanently active. |
|
*/ |
|
if (intf->dev.power.disable_depth) |
|
continue; |
|
if (atomic_read(&intf->dev.power.usage_count) > 0) |
|
return -EBUSY; |
|
w |= intf->needs_remote_wakeup; |
|
|
|
/* Don't allow autosuspend if the device will need |
|
* a reset-resume and any of its interface drivers |
|
* doesn't include support or needs remote wakeup. |
|
*/ |
|
if (udev->quirks & USB_QUIRK_RESET_RESUME) { |
|
struct usb_driver *driver; |
|
|
|
driver = to_usb_driver(intf->dev.driver); |
|
if (!driver->reset_resume || |
|
intf->needs_remote_wakeup) |
|
return -EOPNOTSUPP; |
|
} |
|
} |
|
} |
|
if (w && !device_can_wakeup(&udev->dev)) { |
|
dev_dbg(&udev->dev, "remote wakeup needed for autosuspend\n"); |
|
return -EOPNOTSUPP; |
|
} |
|
|
|
/* |
|
* If the device is a direct child of the root hub and the HCD |
|
* doesn't handle wakeup requests, don't allow autosuspend when |
|
* wakeup is needed. |
|
*/ |
|
if (w && udev->parent == udev->bus->root_hub && |
|
bus_to_hcd(udev->bus)->cant_recv_wakeups) { |
|
dev_dbg(&udev->dev, "HCD doesn't handle wakeup requests\n"); |
|
return -EOPNOTSUPP; |
|
} |
|
|
|
udev->do_remote_wakeup = w; |
|
return 0; |
|
} |
|
|
|
int usb_runtime_suspend(struct device *dev) |
|
{ |
|
struct usb_device *udev = to_usb_device(dev); |
|
int status; |
|
|
|
/* A USB device can be suspended if it passes the various autosuspend |
|
* checks. Runtime suspend for a USB device means suspending all the |
|
* interfaces and then the device itself. |
|
*/ |
|
if (autosuspend_check(udev) != 0) |
|
return -EAGAIN; |
|
|
|
status = usb_suspend_both(udev, PMSG_AUTO_SUSPEND); |
|
|
|
/* Allow a retry if autosuspend failed temporarily */ |
|
if (status == -EAGAIN || status == -EBUSY) |
|
usb_mark_last_busy(udev); |
|
|
|
/* |
|
* The PM core reacts badly unless the return code is 0, |
|
* -EAGAIN, or -EBUSY, so always return -EBUSY on an error |
|
* (except for root hubs, because they don't suspend through |
|
* an upstream port like other USB devices). |
|
*/ |
|
if (status != 0 && udev->parent) |
|
return -EBUSY; |
|
return status; |
|
} |
|
|
|
int usb_runtime_resume(struct device *dev) |
|
{ |
|
struct usb_device *udev = to_usb_device(dev); |
|
int status; |
|
|
|
/* Runtime resume for a USB device means resuming both the device |
|
* and all its interfaces. |
|
*/ |
|
status = usb_resume_both(udev, PMSG_AUTO_RESUME); |
|
return status; |
|
} |
|
|
|
int usb_runtime_idle(struct device *dev) |
|
{ |
|
struct usb_device *udev = to_usb_device(dev); |
|
|
|
/* An idle USB device can be suspended if it passes the various |
|
* autosuspend checks. |
|
*/ |
|
if (autosuspend_check(udev) == 0) |
|
pm_runtime_autosuspend(dev); |
|
/* Tell the core not to suspend it, though. */ |
|
return -EBUSY; |
|
} |
|
|
|
static int usb_set_usb2_hardware_lpm(struct usb_device *udev, int enable) |
|
{ |
|
struct usb_hcd *hcd = bus_to_hcd(udev->bus); |
|
int ret = -EPERM; |
|
|
|
if (hcd->driver->set_usb2_hw_lpm) { |
|
ret = hcd->driver->set_usb2_hw_lpm(hcd, udev, enable); |
|
if (!ret) |
|
udev->usb2_hw_lpm_enabled = enable; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
int usb_enable_usb2_hardware_lpm(struct usb_device *udev) |
|
{ |
|
if (!udev->usb2_hw_lpm_capable || |
|
!udev->usb2_hw_lpm_allowed || |
|
udev->usb2_hw_lpm_enabled) |
|
return 0; |
|
|
|
return usb_set_usb2_hardware_lpm(udev, 1); |
|
} |
|
|
|
int usb_disable_usb2_hardware_lpm(struct usb_device *udev) |
|
{ |
|
if (!udev->usb2_hw_lpm_enabled) |
|
return 0; |
|
|
|
return usb_set_usb2_hardware_lpm(udev, 0); |
|
} |
|
|
|
#endif /* CONFIG_PM */ |
|
|
|
struct bus_type usb_bus_type = { |
|
.name = "usb", |
|
.match = usb_device_match, |
|
.uevent = usb_uevent, |
|
.need_parent_lock = true, |
|
};
|
|
|